miniserv.pl

   1 #!/usr/local/bin/perl
   2 # A very simple perl web server used by Webmin
   3
   4 # Require basic libraries
   5 package miniserv;
   6 use Socket;
   7 use POSIX;
   8 use Time::Local;
   9 eval "use Time::HiRes;";
  10
  11 @itoa64 = split(//, "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
  12
  13 # Find and read config file
  14 if (@ARGV != 1) {
  15         die "Usage: miniserv.pl <config file>";
  16         }
  17 if ($ARGV[0] =~ /^([a-z]:)?\//i) {
  18         $config_file = $ARGV[0];
  19         }
  20 else {
  21         chop($pwd = `pwd`);
  22         $config_file = "$pwd/$ARGV[0]";
  23         }
  24 %config = &read_config_file($config_file);
  25 if ($config{'perllib'}) {
  26         push(@INC, split(/:/, $config{'perllib'}));
  27         $ENV{'PERLLIB'} .= ':'.$config{'perllib'};
  28         }
  29 @startup_msg = ( );
  30
  31 # Check if SSL is enabled and available
  32 if ($config{'ssl'}) {
  33         eval "use Net::SSLeay";
  34         if (!$@) {
  35                 $use_ssl = 1;
  36                 # These functions only exist for SSLeay 1.0
  37                 eval "Net::SSLeay::SSLeay_add_ssl_algorithms()";
  38                 eval "Net::SSLeay::load_error_strings()";
  39                 if ($config{'no_ssl2'}) {
  40                         eval "Net::SSLeay::CTX_set_options($ctx,&Net::SSLeay::OP_NO_SSLv2)";
  41                         }
  42                 if (defined(&Net::SSLeay::X509_STORE_CTX_get_current_cert) &&
  43                     defined(&Net::SSLeay::CTX_load_verify_locations) &&
  44                     defined(&Net::SSLeay::CTX_set_verify)) {
  45                         $client_certs = 1;
  46                         }
  47                 }
  48         }
  49
  50 # Check if IPv6 is enabled and available
  51 if ($config{'ipv6'}) {
  52         eval "use Socket6";
  53         if (!$@) {
  54                 push(@startup_msg, "IPv6 support enabled");
  55                 $use_ipv6 = 1;
  56                 }
  57         else {
  58                 push(@startup_msg, "IPv6 support cannot be enabled without ".
  59                                    "the Socket6 perl module");
  60                 }
  61         }
  62
  63 # Check if the syslog module is available to log hacking attempts
  64 if ($config{'syslog'} && !$config{'inetd'}) {
  65         eval "use Sys::Syslog qw(:DEFAULT setlogsock)";
  66         if (!$@) {
  67                 $use_syslog = 1;
  68                 }
  69         }
  70
  71 # check if the TCP-wrappers module is available
  72 if ($config{'libwrap'}) {
  73         eval "use Authen::Libwrap qw(hosts_ctl STRING_UNKNOWN)";
  74         if (!$@) {
  75                 $use_libwrap = 1;
  76                 }
  77         }
  78
  79 # Check if the MD5 perl module is available
  80 eval "use MD5";
  81 if (!$@) {
  82         $use_md5 = "MD5";
  83         }
  84 else {
  85         eval "use Digest::MD5";
  86         if (!$@) {
  87                 $use_md5 = "Digest::MD5";
  88                 }
  89         }
  90
  91 # Get miniserv's perl path and location
  92 $miniserv_path = $0;
  93 open(SOURCE, $miniserv_path);
  94 <SOURCE> =~ /^#!(\S+)/;
  95 $perl_path = $1;
  96 close(SOURCE);
  97 if (!-x $perl_path) {
  98         $perl_path = $^X;
  99         }
 100 if (-l $perl_path) {
 101         $linked_perl_path = readlink($perl_path);
 102         }
 103 @miniserv_argv = @ARGV;
 104
 105 # Check vital config options
 106 &update_vital_config();
 107
 108 $sidname = $config{'sidname'};
 109 die "Session authentication cannot be used in inetd mode"
 110         if ($config{'inetd'} && $config{'session'});
 111
 112 # check if the PAM module is available to authenticate
 113 if ($config{'assume_pam'}) {
 114         # Just assume that it will work. This can also be used to work around
 115         # a Solaris bug in which using PAM before forking caused it to fail
 116         # later!
 117         $use_pam = 1;
 118         }
 119 elsif (!$config{'no_pam'}) {
 120         eval "use Authen::PAM;";
 121         if (!$@) {
 122                 # check if the PAM authentication can be used by opening a
 123                 # PAM handle
 124                 local $pamh;
 125                 if (ref($pamh = new Authen::PAM($config{'pam'},
 126                                                 $config{'pam_test_user'},
 127                                                 \&pam_conv_func))) {
 128                         # Now test a login to see if /etc/pam.d/webmin is set
 129                         # up properly.
 130                         $pam_conv_func_called = 0;
 131                         $pam_username = "test";
 132                         $pam_password = "test";
 133                         $pamh->pam_authenticate();
 134                         if ($pam_conv_func_called) {
 135                                 push(@startup_msg,
 136                                      "PAM authentication enabled");
 137                                 $use_pam = 1;
 138                                 }
 139                         else {
 140                                 push(@startup_msg,
 141                                     "PAM test failed - maybe ".
 142                                     "/etc/pam.d/$config{'pam'} does not exist");
 143                                 }
 144                         }
 145                 else {
 146                         push(@startup_msg,
 147                              "PAM initialization of Authen::PAM failed");
 148                         }
 149                 }
 150         else {
 151                 push(@startup_msg,
 152                      "Perl module Authen::PAM needed for PAM is ".
 153                      "not installed : $@");
 154                 }
 155         }
 156 if ($config{'pam_only'} && !$use_pam) {
 157         print STDERR $startup_msg[0],"\n";
 158         print STDERR "PAM use is mandatory, but could not be enabled!\n";
 159         exit(1);
 160         }
 161 elsif ($pam_msg && !$use_pam) {
 162         push(@startup_msg,
 163              "Continuing without the Authen::PAM perl module");
 164         }
 165
 166 # Check if the User::Utmp perl module is installed
 167 if ($config{'utmp'}) {
 168         eval "use User::Utmp;";
 169         if (!$@) {
 170                 $write_utmp = 1;
 171                 push(@startup_msg, "UTMP logging enabled");
 172                 }
 173         else {
 174                 push(@startup_msg,
 175                      "Perl module User::Utmp needed for Utmp logging is ".
 176                      "not installed : $@");
 177                 }
 178         }
 179
 180 # See if the crypt function fails
 181 eval "crypt('foo', 'xx')";
 182 if ($@) {
 183         eval "use Crypt::UnixCrypt";
 184         if (!$@) {
 185                 $use_perl_crypt = 1;
 186                 push(@startup_msg,
 187                      "Using Crypt::UnixCrypt for password encryption");
 188                 }
 189         else {
 190                 push(@startup_msg,
 191                      "crypt() function un-implemented, and Crypt::UnixCrypt ".
 192                      "not installed - password authentication will fail");
 193                 }
 194         }
 195
 196 # Check if /dev/urandom really generates random IDs, by calling it twice
 197 local $rand1 = &generate_random_id("foo", 1);
 198 local $rand2 = &generate_random_id("foo", 2);
 199 if ($rand1 eq $rand2) {
 200         $bad_urandom = 1;
 201         push(@startup_msg,
 202              "Random number generator file /dev/urandom is not reliable");
 203         }
 204
 205 # Check if we can call sudo
 206 if ($config{'sudo'} && &has_command("sudo")) {
 207         eval "use IO::Pty";
 208         if (!$@) {
 209                 $use_sudo = 1;
 210                 }
 211         else {
 212                 push(@startup_msg,
 213                      "Perl module IO::Pty needed for calling sudo is not ".
 214                      "installed : $@");
 215                 }
 216         }
 217
 218 # init days and months for http_date
 219 @weekday = ( "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" );
 220 @month = ( "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 221            "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" );
 222
 223 # Change dir to the server root
 224 @roots = ( $config{'root'} );
 225 for($i=0; defined($config{"extraroot_$i"}); $i++) {
 226         push(@roots, $config{"extraroot_$i"});
 227         }
 228 chdir($roots[0]);
 229 eval { $user_homedir = (getpwuid($<))[7]; };
 230 if ($@) {
 231         # getpwuid doesn't work on windows
 232         $user_homedir = $ENV{"HOME"} || $ENV{"USERPROFILE"} || "/";
 233         $on_windows = 1;
 234         }
 235
 236 # Read users file
 237 &read_users_file();
 238
 239 # Setup SSL if possible and if requested
 240 if (!-r $config{'keyfile'}) {
 241         # Key file doesn't exist!
 242         if ($config{'keyfile'}) {
 243                 print STDERR "SSL key file $config{'keyfile'} does not exist\n";
 244                 }
 245         $use_ssl = 0;
 246         }
 247 elsif ($config{'certfile'} && !-r $config{'certfile'}) {
 248         # Cert file doesn't exist!
 249         print STDERR "SSL cert file $config{'certfile'} does not exist\n";
 250         $use_ssl = 0;
 251         }
 252 @ipkeys = &get_ipkeys(\%config);
 253 if ($use_ssl) {
 254         if ($config{'ssl_version'}) {
 255                 # Force an SSL version
 256                 $Net::SSLeay::version = $config{'ssl_version'};
 257                 $Net::SSLeay::ssl_version = $config{'ssl_version'};
 258                 }
 259         $client_certs = 0 if (!-r $config{'ca'} || !%certs);
 260         $ssl_contexts{"*"} = &create_ssl_context($config{'keyfile'},
 261                                                  $config{'certfile'},
 262                                                  $config{'extracas'});
 263         foreach $ipkey (@ipkeys) {
 264                 $ctx = &create_ssl_context($ipkey->{'key'}, $ipkey->{'cert'},
 265                                    $ipkey->{'extracas'} || $config{'extracas'});
 266                 foreach $ip (@{$ipkey->{'ips'}}) {
 267                         $ssl_contexts{$ip} = $ctx;
 268                         }
 269                 }
 270         }
 271
 272 # Load gzip library if enabled
 273 if ($config{'gzip'} eq '1') {
 274         eval "use Compress::Zlib";
 275         if (!$@) {
 276                 $use_gzip = 1;
 277                 }
 278         }
 279
 280 # Setup syslog support if possible and if requested
 281 if ($use_syslog) {
 282         open(ERRDUP, ">&STDERR");
 283         open(STDERR, ">/dev/null");
 284         $log_socket = $config{"logsock"} || "unix";
 285         eval 'openlog($config{"pam"}, "cons,pid,ndelay", "authpriv"); setlogsock($log_socket)';
 286         if ($@) {
 287                 $use_syslog = 0;
 288                 }
 289         else {
 290                 local $msg = ucfirst($config{'pam'})." starting";
 291                 eval { syslog("info", "%s", $msg); };
 292                 if ($@) {
 293                         eval {
 294                                 setlogsock("inet");
 295                                 syslog("info", "%s", $msg);
 296                                 };
 297                         if ($@) {
 298                                 # All attempts to use syslog have failed..
 299                                 $use_syslog = 0;
 300                                 }
 301                         }
 302                 }
 303         open(STDERR, ">&ERRDUP");
 304         close(ERRDUP);
 305         }
 306
 307 # Read MIME types file and add extra types
 308 &read_mime_types();
 309
 310 # get the time zone
 311 if ($config{'log'}) {
 312         local(@gmt, @lct, $days, $hours, $mins);
 313         @gmt = gmtime(time());
 314         @lct = localtime(time());
 315         $days = $lct[3] - $gmt[3];
 316         $hours = ($days < -1 ? 24 : 1 < $days ? -24 : $days * 24) +
 317                  $lct[2] - $gmt[2];
 318         $mins = $hours * 60 + $lct[1] - $gmt[1];
 319         $timezone = ($mins < 0 ? "-" : "+"); $mins = abs($mins);
 320         $timezone .= sprintf "%2.2d%2.2d", $mins/60, $mins%60;
 321         }
 322
 323 # Build various maps from the config files
 324 &build_config_mappings();
 325
 326 # start up external authentication program, if needed
 327 if ($config{'extauth'}) {
 328         socketpair(EXTAUTH, EXTAUTH2, AF_UNIX, SOCK_STREAM, PF_UNSPEC);
 329         if (!($extauth = fork())) {
 330                 close(EXTAUTH);
 331                 close(STDIN);
 332                 close(STDOUT);
 333                 open(STDIN, "<&EXTAUTH2");
 334                 open(STDOUT, ">&EXTAUTH2");
 335                 exec($config{'extauth'}) or die "exec failed : $!\n";
 336                 }
 337         close(EXTAUTH2);
 338         local $os = select(EXTAUTH);
 339         $| = 1; select($os);
 340         }
 341
 342 # Pre-load any libraries
 343 if (!$config{'inetd'}) {
 344         foreach $pl (split(/\s+/, $config{'preload'})) {
 345                 ($pkg, $lib) = split(/=/, $pl);
 346                 $pkg =~ s/[^A-Za-z0-9]/_/g;
 347                 eval "package $pkg; do '$config{'root'}/$lib'";
 348                 if ($@) {
 349                         print STDERR "Failed to pre-load $lib in $pkg : $@\n";
 350                         }
 351                 else {
 352                         print STDERR "Pre-loaded $lib in $pkg\n";
 353                         }
 354                 }
 355         foreach $pl (split(/\s+/, $config{'premodules'})) {
 356                 if ($pl =~ /\//) {
 357                         ($dir, $mod) = split(/\//, $pl);
 358                         }
 359                 else {
 360                         ($dir, $mod) = (undef, $pl);
 361                         }
 362                 push(@INC, "$config{'root'}/$dir");
 363                 eval "package $mod; use $mod ()";
 364                 if ($@) {
 365                         print STDERR "Failed to pre-load $mod : $@\n";
 366                         }
 367                 else {
 368                         print STDERR "Pre-loaded $mod\n";
 369                         }
 370                 }
 371         }
 372
 373 # Open debug log if set
 374 if ($config{'debuglog'}) {
 375         open(DEBUG, ">>$config{'debuglog'}");
 376         chmod(0700, $config{'debuglog'});
 377         select(DEBUG); $| = 1; select(STDOUT);
 378         print DEBUG "miniserv.pl starting ..\n";
 379         }
 380
 381 # Write out (empty) blocked hosts file
 382 &write_blocked_file();
 383
 384 # Initially read webmin cron functions and last execution times
 385 &read_webmin_crons();
 386 %webmincron_last = ( );
 387 &read_file($config{'webmincron_last'}, \%webmincron_last);
 388
 389 # Pre-cache lang files
 390 &precache_files();
 391
 392 if ($config{'inetd'}) {
 393         # We are being run from inetd - go direct to handling the request
 394         &redirect_stderr_to_log();
 395         $SIG{'HUP'} = 'IGNORE';
 396         $SIG{'TERM'} = 'DEFAULT';
 397         $SIG{'PIPE'} = 'DEFAULT';
 398         open(SOCK, "+>&STDIN");
 399
 400         # Check if it is time for the logfile to be cleared
 401         if ($config{'logclear'}) {
 402                 local $write_logtime = 0;
 403                 local @st = stat("$config{'logfile'}.time");
 404                 if (@st) {
 405                         if ($st[9]+$config{'logtime'}*60*60 < time()){
 406                                 # need to clear log
 407                                 $write_logtime = 1;
 408                                 unlink($config{'logfile'});
 409                                 }
 410                         }
 411                 else { $write_logtime = 1; }
 412                 if ($write_logtime) {
 413                         open(LOGTIME, ">$config{'logfile'}.time");
 414                         print LOGTIME time(),"\n";
 415                         close(LOGTIME);
 416                         }
 417                 }
 418
 419         # Work out if IPv6 is being used locally
 420         local $sn = getsockname(SOCK);
 421         print DEBUG "sn=$sn\n";
 422         print DEBUG "length=",length($sn),"\n";
 423         $localipv6 = length($sn) > 16;
 424         print DEBUG "localipv6=$localipv6\n";
 425
 426         # Initialize SSL for this connection
 427         if ($use_ssl) {
 428                 $ssl_con = &ssl_connection_for_ip(SOCK, $localipv6);
 429                 $ssl_con || exit;
 430                 }
 431
 432         # Work out the hostname for this web server
 433         $host = &get_socket_name(SOCK, $localipv6);
 434         print DEBUG "host=$host\n";
 435         $host || exit;
 436         $port = $config{'port'};
 437         $acptaddr = getpeername(SOCK);
 438         print DEBUG "acptaddr=$acptaddr\n";
 439         print DEBUG "length=",length($acptaddr),"\n";
 440         $acptaddr || exit;
 441
 442         # Work out remote and local IPs
 443         $ipv6 = length($acptaddr) > 16;
 444         print DEBUG "ipv6=$ipv6\n";
 445         (undef, $locala) = &get_socket_ip(SOCK, $localipv6);
 446         print DEBUG "locala=$locala\n";
 447         (undef, $peera, undef) = &get_address_ip($acptaddr, $ipv6);
 448         print DEBUG "peera=$peera\n";
 449
 450         print DEBUG "main: Starting handle_request loop pid=$$\n";
 451         while(&handle_request($peera, $locala, $ipv6)) { }
 452         print DEBUG "main: Done handle_request loop pid=$$\n";
 453         close(SOCK);
 454         exit;
 455         }
 456
 457 # Build list of sockets to listen on
 458 $config{'bind'} = '' if ($config{'bind'} eq '*');
 459 if ($config{'bind'}) {
 460         # Listening on a specific IP
 461         if (&check_ip6address($config{'bind'})) {
 462                 # IP is v6
 463                 $use_ipv6 || die "Cannot bind to $config{'bind'} without IPv6";
 464                 push(@sockets, [ inet_pton(Socket6::AF_INET6(),$config{'bind'}),
 465                                  $config{'port'},
 466                                  Socket6::PF_INET6() ]);
 467                 }
 468         else {
 469                 # IP is v4
 470                 push(@sockets, [ inet_aton($config{'bind'}),
 471                                  $config{'port'},
 472                                  PF_INET() ]);
 473                 }
 474         }
 475 else {
 476         # Listening on all IPs
 477         push(@sockets, [ INADDR_ANY, $config{'port'}, PF_INET() ]);
 478         if ($use_ipv6) {
 479                 # Also IPv6
 480                 push(@sockets, [ in6addr_any(), $config{'port'},
 481                                  Socket6::PF_INET6() ]);
 482                 }
 483         }
 484 foreach $s (split(/\s+/, $config{'sockets'})) {
 485         if ($s =~ /^(\d+)$/) {
 486                 # Just listen on another port on the main IP
 487                 push(@sockets, [ $sockets[0]->[0], $s, $sockets[0]->[2] ]);
 488                 if ($use_ipv6 && !$config{'bind'}) {
 489                         # Also listen on that port on the main IPv6 address
 490                         push(@sockets, [ $sockets[1]->[0], $s,
 491                                          $sockets[1]->[2] ]);
 492                         }
 493                 }
 494         elsif ($s =~ /^\*:(\d+)$/) {
 495                 # Listening on all IPs on some port
 496                 push(@sockets, [ INADDR_ANY, $1,
 497                                  PF_INET() ]);
 498                 if ($use_ipv6) {
 499                         push(@sockets, [ in6addr_any(), $1,
 500                                          Socket6::PF_INET6() ]);
 501                         }
 502                 }
 503         elsif ($s =~ /^(\S+):(\d+)$/) {
 504                 # Listen on a specific port and IP
 505                 my ($ip, $port) = ($1, $2);
 506                 if (&check_ip6address($ip)) {
 507                         $use_ipv6 || die "Cannot bind to $ip without IPv6";
 508                         push(@sockets, [ inet_pton(Socket6::AF_INET6(),
 509                                                    $ip),
 510                                          $port, Socket6::PF_INET6() ]);
 511                         }
 512                 else {
 513                         push(@sockets, [ inet_aton($ip), $port,
 514                                          PF_INET() ]);
 515                         }
 516                 }
 517         elsif ($s =~ /^([0-9\.]+):\*$/ || $s =~ /^([0-9\.]+)$/) {
 518                 # Listen on the main port on another IPv4 address
 519                 push(@sockets, [ inet_aton($1), $sockets[0]->[1],
 520                                  PF_INET() ]);
 521                 }
 522         elsif (($s =~ /^([0-9a-f\:]+):\*$/ || $s =~ /^([0-9a-f\:]+)$/) &&
 523                $use_ipv6) {
 524                 # Listen on the main port on another IPv6 address
 525                 push(@sockets, [ inet_pton(Socket6::AF_INET6(), $1),
 526                                  $sockets[0]->[1],
 527                                  Socket6::PF_INET6() ]);
 528                 }
 529         }
 530
 531 # Open all the sockets
 532 $proto = getprotobyname('tcp');
 533 @sockerrs = ( );
 534 $tried_inaddr_any = 0;
 535 for($i=0; $i<@sockets; $i++) {
 536         $fh = "MAIN$i";
 537         socket($fh, $sockets[$i]->[2], SOCK_STREAM, $proto) ||
 538                 die "Failed to open socket family $sockets[$i]->[2] : $!";
 539         setsockopt($fh, SOL_SOCKET, SO_REUSEADDR, pack("l", 1));
 540         if ($sockets[$i]->[2] eq PF_INET()) {
 541                 $pack = pack_sockaddr_in($sockets[$i]->[1], $sockets[$i]->[0]);
 542                 }
 543         else {
 544                 $pack = pack_sockaddr_in6($sockets[$i]->[1], $sockets[$i]->[0]);
 545                 setsockopt($fh, 41, 26, pack("l", 1));  # IPv6 only
 546                 }
 547         for($j=0; $j<5; $j++) {
 548                 last if (bind($fh, $pack));
 549                 sleep(1);
 550                 }
 551         if ($j == 5) {
 552                 # All attempts failed .. give up
 553                 if ($sockets[$i]->[0] eq INADDR_ANY ||
 554                     $use_ipv6 && $sockets[$i]->[0] eq in6addr_any()) {
 555                         push(@sockerrs,
 556                              "Failed to bind to port $sockets[$i]->[1] : $!");
 557                         $tried_inaddr_any = 1;
 558                         }
 559                 else {
 560                         $ip = &network_to_address($sockets[$i]->[0]);
 561                         push(@sockerrs,
 562                              "Failed to bind to IP $ip port ".
 563                              "$sockets[$i]->[1] : $!");
 564                         }
 565                 }
 566         else {
 567                 listen($fh, SOMAXCONN);
 568                 push(@socketfhs, $fh);
 569                 $ipv6fhs{$fh} = $sockets[$i]->[2] eq PF_INET() ? 0 : 1;
 570                 }
 571         }
 572 foreach $se (@sockerrs) {
 573         print STDERR $se,"\n";
 574         }
 575
 576 # If all binds failed, try binding to any address
 577 if (!@socketfhs && !$tried_inaddr_any) {
 578         print STDERR "Falling back to listening on any address\n";
 579         $fh = "MAIN";
 580         socket($fh, PF_INET(), SOCK_STREAM, $proto) ||
 581                 die "Failed to open socket : $!";
 582         setsockopt($fh, SOL_SOCKET, SO_REUSEADDR, pack("l", 1));
 583         if (!bind($fh, pack_sockaddr_in($sockets[0]->[1], INADDR_ANY))) {
 584                 print STDERR "Failed to bind to port $sockets[0]->[1] : $!\n";
 585                 exit(1);
 586                 }
 587         listen($fh, SOMAXCONN);
 588         push(@socketfhs, $fh);
 589         }
 590 elsif (!@socketfhs && $tried_inaddr_any) {
 591         print STDERR "Could not listen on any ports";
 592         exit(1);
 593         }
 594
 595 if ($config{'listen'}) {
 596         # Open the socket that allows other webmin servers to find this one
 597         $proto = getprotobyname('udp');
 598         if (socket(LISTEN, PF_INET(), SOCK_DGRAM, $proto)) {
 599                 setsockopt(LISTEN, SOL_SOCKET, SO_REUSEADDR, pack("l", 1));
 600                 bind(LISTEN, pack_sockaddr_in($config{'listen'}, INADDR_ANY));
 601                 listen(LISTEN, SOMAXCONN);
 602                 }
 603         else {
 604                 $config{'listen'} = 0;
 605                 }
 606         }
 607
 608 # Split from the controlling terminal, unless configured not to
 609 if (!$config{'nofork'}) {
 610         if (fork()) { exit; }
 611         }
 612 eval { setsid(); };     # may not work on Windows
 613
 614 # Close standard file handles
 615 open(STDIN, "</dev/null");
 616 open(STDOUT, ">/dev/null");
 617 &redirect_stderr_to_log();
 618 &log_error("miniserv.pl started");
 619 foreach $msg (@startup_msg) {
 620         &log_error($msg);
 621         }
 622
 623 # write out the PID file
 624 &write_pid_file();
 625
 626 # Start the log-clearing process, if needed. This checks every minute
 627 # to see if the log has passed its reset time, and if so clears it
 628 if ($config{'logclear'}) {
 629         if (!($logclearer = fork())) {
 630                 &close_all_sockets();
 631                 close(LISTEN);
 632                 while(1) {
 633                         local $write_logtime = 0;
 634                         local @st = stat("$config{'logfile'}.time");
 635                         if (@st) {
 636                                 if ($st[9]+$config{'logtime'}*60*60 < time()){
 637                                         # need to clear log
 638                                         $write_logtime = 1;
 639                                         unlink($config{'logfile'});
 640                                         }
 641                                 }
 642                         else { $write_logtime = 1; }
 643                         if ($write_logtime) {
 644                                 open(LOGTIME, ">$config{'logfile'}.time");
 645                                 print LOGTIME time(),"\n";
 646                                 close(LOGTIME);
 647                                 }
 648                         sleep(5*60);
 649                         }
 650                 exit;
 651                 }
 652         push(@childpids, $logclearer);
 653         }
 654
 655 # Setup the logout time dbm if needed
 656 if ($config{'session'}) {
 657         eval "use SDBM_File";
 658         dbmopen(%sessiondb, $config{'sessiondb'}, 0700);
 659         eval "\$sessiondb{'1111111111'} = 'foo bar';";
 660         if ($@) {
 661                 dbmclose(%sessiondb);
 662                 eval "use NDBM_File";
 663                 dbmopen(%sessiondb, $config{'sessiondb'}, 0700);
 664                 }
 665         else {
 666                 delete($sessiondb{'1111111111'});
 667                 }
 668         }
 669
 670 # Run the main loop
 671 $SIG{'HUP'} = 'miniserv::trigger_restart';
 672 $SIG{'TERM'} = 'miniserv::term_handler';
 673 $SIG{'USR1'} = 'miniserv::trigger_reload';
 674 $SIG{'PIPE'} = 'IGNORE';
 675 local $remove_session_count = 0;
 676 $need_pipes = $config{'passdelay'} || $config{'session'};
 677 while(1) {
 678         # wait for a new connection, or a message from a child process
 679         local ($i, $rmask);
 680         if (@childpids <= $config{'maxconns'}) {
 681                 # Only accept new main socket connects when ready
 682                 local $s;
 683                 foreach $s (@socketfhs) {
 684                         vec($rmask, fileno($s), 1) = 1;
 685                         }
 686                 }
 687         else {
 688                 printf STDERR "too many children (%d > %d)\n",
 689                         scalar(@childpids), $config{'maxconns'};
 690                 }
 691         if ($need_pipes) {
 692                 for($i=0; $i<@passin; $i++) {
 693                         vec($rmask, fileno($passin[$i]), 1) = 1;
 694                         }
 695                 }
 696         vec($rmask, fileno(LISTEN), 1) = 1 if ($config{'listen'});
 697
 698         # Wait for a connection
 699         local $sel = select($rmask, undef, undef, 10);
 700
 701         # Check the flag files
 702         if ($config{'restartflag'} && -r $config{'restartflag'}) {
 703                 print STDERR "restart flag file detected\n";
 704                 unlink($config{'restartflag'});
 705                 $need_restart = 1;
 706                 }
 707         if ($config{'reloadflag'} && -r $config{'reloadflag'}) {
 708                 unlink($config{'reloadflag'});
 709                 $need_reload = 1;
 710                 }
 711
 712         if ($need_restart) {
 713                 # Got a HUP signal while in select() .. restart now
 714                 &restart_miniserv();
 715                 }
 716         if ($need_reload) {
 717                 # Got a USR1 signal while in select() .. re-read config
 718                 $need_reload = 0;
 719                 &reload_config_file();
 720                 }
 721         local $time_now = time();
 722
 723         # Clean up finished processes
 724         local $pid;
 725         do {    $pid = waitpid(-1, WNOHANG);
 726                 @childpids = grep { $_ != $pid } @childpids;
 727                 } while($pid != 0 && $pid != -1);
 728
 729         # run the unblocking procedure to check if enough time has passed to
 730         # unblock hosts that heve been blocked because of password failures
 731         $unblocked = 0;
 732         if ($config{'blockhost_failures'}) {
 733                 $i = 0;
 734                 while ($i <= $#deny) {
 735                         if ($blockhosttime{$deny[$i]} &&
 736                             $config{'blockhost_time'} != 0 &&
 737                             ($time_now - $blockhosttime{$deny[$i]}) >=
 738                              $config{'blockhost_time'}) {
 739                                 # the host can be unblocked now
 740                                 $hostfail{$deny[$i]} = 0;
 741                                 splice(@deny, $i, 1);
 742                                 $unblocked = 1;
 743                                 }
 744                         $i++;
 745                         }
 746                 }
 747
 748         # Do the same for blocked users
 749         if ($config{'blockuser_failures'}) {
 750                 $i = 0;
 751                 while ($i <= $#deny) {
 752                         if ($blockusertime{$deny[$i]} &&
 753                             $config{'blockuser_time'} != 0 &&
 754                             ($time_now - $blockusertime{$deny[$i]}) >=
 755                              $config{'blockuser_time'}) {
 756                                 # the user can be unblocked now
 757                                 $userfail{$deny[$i]} = 0;
 758                                 splice(@denyusers, $i, 1);
 759                                 $unblocked = 1;
 760                                 }
 761                         $i++;
 762                         }
 763                 }
 764         if ($unblocked) {
 765                 &write_blocked_file();
 766                 }
 767
 768         # Check if any webmin cron jobs are ready to run
 769         &execute_ready_webmin_crons();
 770
 771         if ($config{'session'} && (++$remove_session_count%50) == 0) {
 772                 # Remove sessions with more than 7 days of inactivity,
 773                 local $s;
 774                 foreach $s (keys %sessiondb) {
 775                         local ($user, $ltime, $lip) =
 776                                 split(/\s+/, $sessiondb{$s});
 777                         if ($time_now - $ltime > 7*24*60*60) {
 778                                 &run_logout_script($s, $user);
 779                                 &write_logout_utmp($user, $lip);
 780                                 delete($sessiondb{$s});
 781                                 if ($use_syslog) {
 782                                         syslog("info", "%s",
 783                                               "Timeout of session for $user");
 784                                         }
 785                                 }
 786                         }
 787                 }
 788
 789         if ($use_pam && $config{'pam_conv'}) {
 790                 # Remove PAM sessions with more than 5 minutes of inactivity
 791                 local $c;
 792                 foreach $c (values %conversations) {
 793                         if ($time_now - $c->{'time'} > 5*60) {
 794                                 &end_pam_conversation($c);
 795                                 if ($use_syslog) {
 796                                         syslog("info", "%s", "Timeout of PAM ".
 797                                                 "session for $c->{'user'}");
 798                                         }
 799                                 }
 800                         }
 801                 }
 802
 803         # Don't check any sockets if there is no activity
 804         next if ($sel <= 0);
 805
 806         # Check if any of the main sockets have received a new connection
 807         local $sn = 0;
 808         foreach $s (@socketfhs) {
 809                 if (vec($rmask, fileno($s), 1)) {
 810                         # got new connection
 811                         $acptaddr = accept(SOCK, $s);
 812                         if (!$acptaddr) { next; }
 813                         binmode(SOCK);  # turn off any Perl IO stuff
 814
 815                         # create pipes
 816                         local ($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw);
 817                         if ($need_pipes) {
 818                                 ($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw) =
 819                                         &allocate_pipes();
 820                                 }
 821
 822                         # Work out IP and port of client
 823                         local ($peerb, $peera, $peerp) =
 824                                 &get_address_ip($acptaddr, $ipv6fhs{$s});
 825
 826                         # Work out the local IP
 827                         (undef, $locala) = &get_socket_ip(SOCK, $ipv6fhs{$s});
 828
 829                         # Check username of connecting user
 830                         $localauth_user = undef;
 831                         if ($config{'localauth'} && $peera eq "127.0.0.1") {
 832                                 if (open(TCP, "/proc/net/tcp")) {
 833                                         # Get the info direct from the kernel
 834                                         $peerh = sprintf("%4.4X", $peerp);
 835                                         while(<TCP>) {
 836                                                 s/^\s+//;
 837                                                 local @t = split(/[\s:]+/, $_);
 838                                                 if ($t[1] eq '0100007F' &&
 839                                                     $t[2] eq $peerh) {
 840                                                         $localauth_user =
 841                                                             getpwuid($t[11]);
 842                                                         last;
 843                                                         }
 844                                                 }
 845                                         close(TCP);
 846                                         }
 847                                 if (!$localauth_user) {
 848                                         # Call lsof for the info
 849                                         local $lsofpid = open(LSOF,
 850                                                 "$config{'localauth'} -i ".
 851                                                 "TCP\@127.0.0.1:$peerp |");
 852                                         while(<LSOF>) {
 853                                                 if (/^(\S+)\s+(\d+)\s+(\S+)/ &&
 854                                                     $2 != $$ && $2 != $lsofpid){
 855                                                         $localauth_user = $3;
 856                                                         }
 857                                                 }
 858                                         close(LSOF);
 859                                         }
 860                                 }
 861
 862                         # Work out the hostname for this web server
 863                         $host = &get_socket_name(SOCK, $ipv6fhs{$s});
 864                         if (!$host) {
 865                                 print STDERR
 866                                     "Failed to get local socket name : $!\n";
 867                                 close(SOCK);
 868                                 next;
 869                                 }
 870                         $port = $sockets[$sn]->[1];
 871
 872                         # fork the subprocess
 873                         local $handpid;
 874                         if (!($handpid = fork())) {
 875                                 # setup signal handlers
 876                                 $SIG{'TERM'} = 'DEFAULT';
 877                                 $SIG{'PIPE'} = 'DEFAULT';
 878                                 #$SIG{'CHLD'} = 'IGNORE';
 879                                 $SIG{'HUP'} = 'IGNORE';
 880                                 $SIG{'USR1'} = 'IGNORE';
 881
 882                                 # Close the file handle for the session DBM
 883                                 dbmclose(%sessiondb);
 884
 885                                 # close useless pipes
 886                                 if ($need_pipes) {
 887                                         &close_all_pipes();
 888                                         close($PASSINr); close($PASSOUTw);
 889                                         }
 890                                 &close_all_sockets();
 891                                 close(LISTEN);
 892
 893                                 # Initialize SSL for this connection
 894                                 if ($use_ssl) {
 895                                         $ssl_con = &ssl_connection_for_ip(
 896                                                         SOCK, $ipv6fhs{$s});
 897                                         $ssl_con || exit;
 898                                         }
 899
 900                                 print DEBUG
 901                                   "main: Starting handle_request loop pid=$$\n";
 902                                 while(&handle_request($peera, $locala,
 903                                                       $ipv6fhs{$s})) {
 904                                         # Loop until keepalive stops
 905                                         }
 906                                 print DEBUG
 907                                   "main: Done handle_request loop pid=$$\n";
 908                                 shutdown(SOCK, 1);
 909                                 close(SOCK);
 910                                 close($PASSINw); close($PASSOUTw);
 911                                 exit;
 912                                 }
 913                         push(@childpids, $handpid);
 914                         if ($need_pipes) {
 915                                 close($PASSINw); close($PASSOUTr);
 916                                 push(@passin, $PASSINr);
 917                                 push(@passout, $PASSOUTw);
 918                                 }
 919                         close(SOCK);
 920                         }
 921                 $sn++;
 922                 }
 923
 924         if ($config{'listen'} && vec($rmask, fileno(LISTEN), 1)) {
 925                 # Got UDP packet from another webmin server
 926                 local $rcvbuf;
 927                 local $from = recv(LISTEN, $rcvbuf, 1024, 0);
 928                 next if (!$from);
 929                 local $fromip = inet_ntoa((unpack_sockaddr_in($from))[1]);
 930                 local $toip = inet_ntoa((unpack_sockaddr_in(
 931                                          getsockname(LISTEN)))[1]);
 932                 if ((!@deny || !&ip_match($fromip, $toip, @deny)) &&
 933                     (!@allow || &ip_match($fromip, $toip, @allow))) {
 934                         local $listenhost = &get_socket_name(LISTEN, 0);
 935                         send(LISTEN, "$listenhost:$config{'port'}:".
 936                                  ($use_ssl || $config{'inetd_ssl'} ? 1 : 0).":".
 937                                  ($config{'listenhost'} ?
 938                                         &get_system_hostname() : ""),
 939                                  0, $from)
 940                                 if ($listenhost);
 941                         }
 942                 }
 943
 944         # check for session, password-timeout and PAM messages from subprocesses
 945         for($i=0; $i<@passin; $i++) {
 946                 if (vec($rmask, fileno($passin[$i]), 1)) {
 947                         # this sub-process is asking about a password
 948                         local $infd = $passin[$i];
 949                         local $outfd = $passout[$i];
 950                         #local $inline = <$infd>;
 951                         local $inline = &sysread_line($infd);
 952                         if ($inline) {
 953                                 print DEBUG "main: inline $inline";
 954                                 }
 955                         else {
 956                                 print DEBUG "main: inline EOF\n";
 957                                 }
 958                         if ($inline =~ /^delay\s+(\S+)\s+(\S+)\s+(\d+)/) {
 959                                 # Got a delay request from a subprocess.. for
 960                                 # valid logins, there is no delay (to prevent
 961                                 # denial of service attacks), but for invalid
 962                                 # logins the delay increases with each failed
 963                                 # attempt.
 964                                 if ($3) {
 965                                         # login OK.. no delay
 966                                         print $outfd "0 0\n";
 967                                         $wasblocked = $hostfail{$2} ||
 968                                                       $userfail{$1};
 969                                         $hostfail{$2} = 0;
 970                                         $userfail{$1} = 0;
 971                                         if ($wasblocked) {
 972                                                 &write_blocked_file();
 973                                                 }
 974                                         }
 975                                 else {
 976                                         # login failed..
 977                                         $hostfail{$2}++;
 978                                         $userfail{$1}++;
 979                                         $blocked = 0;
 980
 981                                         # add the host to the block list,
 982                                         # if configured
 983                                         if ($config{'blockhost_failures'} &&
 984                                             $hostfail{$2} >=
 985                                               $config{'blockhost_failures'}) {
 986                                                 push(@deny, $2);
 987                                                 $blockhosttime{$2} = $time_now;
 988                                                 $blocked = 1;
 989                                                 if ($use_syslog) {
 990                                                         local $logtext = "Security alert: Host $2 blocked after $config{'blockhost_failures'} failed logins for user $1";
 991                                                         syslog("crit", "%s",
 992                                                                 $logtext);
 993                                                         }
 994                                                 }
 995
 996                                         # add the user to the user block list,
 997                                         # if configured
 998                                         if ($config{'blockuser_failures'} &&
 999                                             $userfail{$1} >=
1000                                               $config{'blockuser_failures'}) {
1001                                                 push(@denyusers, $1);
1002                                                 $blockusertime{$1} = $time_now;
1003                                                 $blocked = 2;
1004                                                 if ($use_syslog) {
1005                                                         local $logtext = "Security alert: User $1 blocked after $config{'blockuser_failures'} failed logins";
1006                                                         syslog("crit", "%s",
1007                                                                 $logtext);
1008                                                         }
1009                                                 }
1010
1011                                         # Lock out the user's password, if enabled
1012                                         if ($config{'blocklock'} &&
1013                                             $userfail{$1} >=
1014                                               $config{'blockuser_failures'}) {
1015                                                 my $lk = &lock_user_password($1);
1016                                                 $blocked = 2;
1017                                                 if ($use_syslog) {
1018                                                         local $logtext = $lk == 1 ? "Security alert: User $1 locked after $config{'blockuser_failures'} failed logins" : $lk < 0 ? "Security alert: User could not be locked" : "Security alert: User is already locked";
1019                                                         syslog("crit", "%s",
1020                                                                 $logtext);
1021                                                         }
1022                                                 }
1023
1024                                         # Send back a delay
1025                                         $dl = $userdlay{$1} -
1026                                            int(($time_now - $userlast{$1})/50);
1027                                         $dl = $dl < 0 ? 0 : $dl+1;
1028                                         print $outfd "$dl $blocked\n";
1029                                         $userdlay{$1} = $dl;
1030
1031                                         # Write out blocked status file
1032                                         if ($blocked) {
1033                                                 &write_blocked_file();
1034                                                 }
1035                                         }
1036                                 $userlast{$1} = $time_now;
1037                                 }
1038                         elsif ($inline =~ /^verify\s+(\S+)\s+(\S+)/) {
1039                                 # Verifying a session ID
1040                                 local $session_id = $1;
1041                                 local $notimeout = $2;
1042                                 local $skey = $sessiondb{$session_id} ?
1043                                                 $session_id :
1044                                                 &hash_session_id($session_id);
1045                                 if (!defined($sessiondb{$skey})) {
1046                                         # Session doesn't exist
1047                                         print $outfd "0 0\n";
1048                                         }
1049                                 else {
1050                                         local ($user, $ltime) =
1051                                           split(/\s+/, $sessiondb{$skey});
1052                                         local $lot = &get_logout_time($user, $session_id);
1053                                         if ($lot &&
1054                                             $time_now - $ltime > $lot*60 &&
1055                                             !$notimeout) {
1056                                                 # Session has timed out
1057                                                 print $outfd "1 ",$time_now - $ltime,"\n";
1058                                                 #delete($sessiondb{$skey});
1059                                                 }
1060                                         else {
1061                                                 # Session is OK
1062                                                 print $outfd "2 $user\n";
1063                                                 if ($lot &&
1064                                                     $time_now - $ltime >
1065                                                     ($lot*60)/2) {
1066                                                         $sessiondb{$skey} = "$user $time_now";
1067                                                         }
1068                                                 }
1069                                         }
1070                                 }
1071                         elsif ($inline =~ /^new\s+(\S+)\s+(\S+)\s+(\S+)/) {
1072                                 # Creating a new session
1073                                 local $session_id = $1;
1074                                 local $user = $2;
1075                                 local $ip = $3;
1076                                 $sessiondb{&hash_session_id($session_id)} =
1077                                         "$user $time_now $ip";
1078                                 }
1079                         elsif ($inline =~ /^delete\s+(\S+)/) {
1080                                 # Logging out a session
1081                                 local $session_id = $1;
1082                                 local $skey = $sessiondb{$session_id} ?
1083                                                 $session_id :
1084                                                 &hash_session_id($session_id);
1085                                 local @sdb = split(/\s+/, $sessiondb{$skey});
1086                                 print $outfd $sdb[0],"\n";
1087                                 delete($sessiondb{$skey});
1088                                 }
1089                         elsif ($inline =~ /^pamstart\s+(\S+)\s+(\S+)\s+(.*)/) {
1090                                 # Starting a new PAM conversation
1091                                 local ($cid, $host, $user) = ($1, $2, $3);
1092
1093                                 # Does this user even need PAM?
1094                                 local ($realuser, $canlogin) =
1095                                         &can_user_login($user, undef, $host);
1096                                 local $conv;
1097                                 if ($canlogin == 0) {
1098                                         # Cannot even login!
1099                                         print $outfd "0 Invalid username\n";
1100                                         }
1101                                 elsif ($canlogin != 2) {
1102                                         # Not using PAM .. so just ask for
1103                                         # the password.
1104                                         $conv = { 'user' => $realuser,
1105                                                   'host' => $host,
1106                                                   'step' => 0,
1107                                                   'cid' => $cid,
1108                                                   'time' => time() };
1109                                         print $outfd "3 Password\n";
1110                                         }
1111                                 else {
1112                                         # Start the PAM conversation
1113                                         # sub-process, and get a question
1114                                         $conv = { 'user' => $realuser,
1115                                                   'host' => $host,
1116                                                   'cid' => $cid,
1117                                                   'time' => time() };
1118                                         local ($PAMINr, $PAMINw, $PAMOUTr,
1119                                                 $PAMOUTw) = &allocate_pipes();
1120                                         local $pampid = fork();
1121                                         if (!$pampid) {
1122                                                 close($PAMOUTr); close($PAMINw);
1123                                                 &pam_conversation_process(
1124                                                         $realuser,
1125                                                         $PAMOUTw, $PAMINr);
1126                                                 }
1127                                         close($PAMOUTw); close($PAMINr);
1128                                         $conv->{'pid'} = $pampid;
1129                                         $conv->{'PAMOUTr'} = $PAMOUTr;
1130                                         $conv->{'PAMINw'} = $PAMINw;
1131                                         push(@childpids, $pampid);
1132
1133                                         # Get the first PAM question
1134                                         local $pok = &recv_pam_question(
1135                                                 $conv, $outfd);
1136                                         if (!$pok) {
1137                                                 &end_pam_conversation($conv);
1138                                                 }
1139                                         }
1140
1141                                 $conversations{$cid} = $conv if ($conv);
1142                                 }
1143                         elsif ($inline =~ /^pamanswer\s+(\S+)\s+(.*)/) {
1144                                 # A response to a PAM question
1145                                 local ($cid, $answer) = ($1, $2);
1146                                 local $conv = $conversations{$cid};
1147                                 if (!$conv) {
1148                                         # No such conversation?
1149                                         print $outfd "0 Bad login session\n";
1150                                         }
1151                                 elsif ($conv->{'pid'}) {
1152                                         # Send the PAM response and get
1153                                         # the next question
1154                                         &send_pam_answer($conv, $answer);
1155                                         local $pok = &recv_pam_question($conv, $outfd);
1156                                         if (!$pok) {
1157                                                 &end_pam_conversation($conv);
1158                                                 }
1159                                         }
1160                                 else {
1161                                         # This must be the password .. try it
1162                                         # and send back the results
1163                                         local ($vu, $expired, $nonexist) =
1164                                                 &validate_user($conv->{'user'},
1165                                                                $answer,
1166                                                                $conf->{'host'});
1167                                         local $ok = $vu ? 1 : 0;
1168                                         print $outfd "2 $conv->{'user'} $ok $expired $notexist\n";
1169                                         &end_pam_conversation($conv);
1170                                         }
1171                                 }
1172                         elsif ($inline =~ /^writesudo\s+(\S+)\s+(\d+)/) {
1173                                 # Store the fact that some user can sudo to root
1174                                 local ($user, $ok) = ($1, $2);
1175                                 $sudocache{$user} = $ok." ".time();
1176                                 }
1177                         elsif ($inline =~ /^readsudo\s+(\S+)/) {
1178                                 # Query the user sudo cache (valid for 1 minute)
1179                                 local $user = $1;
1180                                 local ($ok, $last) =
1181                                         split(/\s+/, $sudocache{$user});
1182                                 if ($last < time()-60) {
1183                                         # Cache too old
1184                                         print $outfd "2\n";
1185                                         }
1186                                 else {
1187                                         # Tell client OK or not
1188                                         print $outfd "$ok\n";
1189                                         }
1190                                 }
1191                         elsif ($inline =~ /\S/) {
1192                                 # Unknown line from pipe?
1193                                 print DEBUG "main: Unknown line from pipe $inline\n";
1194                                 print STDERR "Unknown line from pipe $inline\n";
1195                                 }
1196                         else {
1197                                 # close pipe
1198                                 close($infd); close($outfd);
1199                                 $passin[$i] = $passout[$i] = undef;
1200                                 }
1201                         }
1202                 }
1203         @passin = grep { defined($_) } @passin;
1204         @passout = grep { defined($_) } @passout;
1205         }
1206
1207 # handle_request(remoteaddress, localaddress, ipv6-flag)
1208 # Where the real work is done
1209 sub handle_request
1210 {
1211 local ($acptip, $localip, $ipv6) = @_;
1212 print DEBUG "handle_request: from $acptip to $localip ipv6=$ipv6\n";
1213 if ($config{'loghost'}) {
1214         $acpthost = &to_hostname($acptip);
1215         $acpthost = $acptip if (!$acpthost);
1216         }
1217 else {
1218         $acpthost = $acptip;
1219         }
1220 $datestr = &http_date(time());
1221 $ok_code = 200;
1222 $ok_message = "Document follows";
1223 $logged_code = undef;
1224 $reqline = $request_uri = $page = undef;
1225 $authuser = undef;
1226 $validated = undef;
1227
1228 # check address against access list
1229 if (@deny && &ip_match($acptip, $localip, @deny) ||
1230     @allow && !&ip_match($acptip, $localip, @allow)) {
1231         &http_error(403, "Access denied for $acptip");
1232         return 0;
1233         }
1234
1235 if ($use_libwrap) {
1236         # Check address with TCP-wrappers
1237         if (!hosts_ctl($config{'pam'}, STRING_UNKNOWN,
1238                        $acptip, STRING_UNKNOWN)) {
1239                 &http_error(403, "Access denied for $acptip by TCP wrappers");
1240                 return 0;
1241                 }
1242         }
1243 print DEBUG "handle_request: passed IP checks\n";
1244
1245 # Compute a timeout for the start of headers, based on the number of
1246 # child processes. As this increases, we use a shorter timeout to avoid
1247 # an attacker overloading the system.
1248 local $header_timeout = 60 + ($config{'maxconns'} - @childpids) * 10;
1249
1250 # Wait at most 60 secs for start of headers for initial requests, or
1251 # 10 minutes for kept-alive connections
1252 local $rmask;
1253 vec($rmask, fileno(SOCK), 1) = 1;
1254 local $to = $checked_timeout ? 10*60 : $header_timeout;
1255 local $sel = select($rmask, undef, undef, $to);
1256 if (!$sel) {
1257         if ($checked_timeout) {
1258                 print DEBUG "handle_request: exiting due to timeout of $to\n";
1259                 exit;
1260                 }
1261         else {
1262                 &http_error(400, "Timeout",
1263                             "Waited for that $to seconds for start of headers");
1264                 }
1265         }
1266 $checked_timeout++;
1267 print DEBUG "handle_request: passed timeout check\n";
1268
1269 # Read the HTTP request and headers
1270 local $origreqline = &read_line();
1271 ($reqline = $origreqline) =~ s/\r|\n//g;
1272 $method = $page = $request_uri = undef;
1273 print DEBUG "handle_request reqline=$reqline\n";
1274 if (!$reqline && (!$use_ssl || $checked_timeout > 1)) {
1275         # An empty request .. just close the connection
1276         print DEBUG "handle_request: rejecting empty request\n";
1277         return 0;
1278         }
1279 elsif ($reqline !~ /^(\S+)\s+(.*)\s+HTTP\/1\..$/) {
1280         print DEBUG "handle_request: invalid reqline=$reqline\n";
1281         if ($use_ssl) {
1282                 # This could be an http request when it should be https
1283                 $use_ssl = 0;
1284                 local $url = $config{'musthost'} ?
1285                                 "https://$config{'musthost'}:$port/" :
1286                                 "https://$host:$port/";
1287                 if ($config{'ssl_redirect'}) {
1288                         # Just re-direct to the correct URL
1289                         sleep(1);       # Give browser a change to finish
1290                                         # sending its request
1291                         &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
1292                         &write_data("Date: $datestr\r\n");
1293                         &write_data("Server: $config{'server'}\r\n");
1294                         &write_data("Location: $url\r\n");
1295                         &write_keep_alive(0);
1296                         &write_data("\r\n");
1297                         return 0;
1298                         }
1299                 else {
1300                         # Tell user the correct URL
1301                         &http_error(200, "Bad Request", "This web server is running in SSL mode. Try the URL <a href='$url'>$url</a> instead.<br>");
1302                         }
1303                 }
1304         elsif (ord(substr($reqline, 0, 1)) == 128 && !$use_ssl) {
1305                 # This could be an https request when it should be http ..
1306                 # need to fake a HTTP response
1307                 eval <<'EOF';
1308                         use Net::SSLeay;
1309                         eval "Net::SSLeay::SSLeay_add_ssl_algorithms()";
1310                         eval "Net::SSLeay::load_error_strings()";
1311                         $ssl_ctx = Net::SSLeay::CTX_new();
1312                         Net::SSLeay::CTX_use_RSAPrivateKey_file(
1313                                 $ssl_ctx, $config{'keyfile'},
1314                                 &Net::SSLeay::FILETYPE_PEM);
1315                         Net::SSLeay::CTX_use_certificate_file(
1316                                 $ssl_ctx,
1317                                 $config{'certfile'} || $config{'keyfile'},
1318                                 &Net::SSLeay::FILETYPE_PEM);
1319                         $ssl_con = Net::SSLeay::new($ssl_ctx);
1320                         pipe(SSLr, SSLw);
1321                         if (!fork()) {
1322                                 close(SSLr);
1323                                 select(SSLw); $| = 1; select(STDOUT);
1324                                 print SSLw $origreqline;
1325                                 local $buf;
1326                                 while(sysread(SOCK, $buf, 1) > 0) {
1327                                         print SSLw $buf;
1328                                         }
1329                                 close(SOCK);
1330                                 exit;
1331                                 }
1332                         close(SSLw);
1333                         Net::SSLeay::set_wfd($ssl_con, fileno(SOCK));
1334                         Net::SSLeay::set_rfd($ssl_con, fileno(SSLr));
1335                         Net::SSLeay::accept($ssl_con) || die "accept() failed";
1336                         $use_ssl = 1;
1337                         local $url = $config{'musthost'} ?
1338                                         "https://$config{'musthost'}:$port/" :
1339                                         "https://$host:$port/";
1340                         if ($config{'ssl_redirect'}) {
1341                                 # Just re-direct to the correct URL
1342                                 sleep(1);       # Give browser a change to
1343                                                 # finish sending its request
1344                                 &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
1345                                 &write_data("Date: $datestr\r\n");
1346                                 &write_data("Server: $config{'server'}\r\n");
1347                                 &write_data("Location: $url\r\n");
1348                                 &write_keep_alive(0);
1349                                 &write_data("\r\n");
1350                                 return 0;
1351                                 }
1352                         else {
1353                                 # Tell user the correct URL
1354                                 &http_error(200, "Bad Request", "This web server is not running in SSL mode. Try the URL <a href='$url'>$url</a> instead.<br>");
1355                                 }
1356 EOF
1357                 if ($@) {
1358                         &http_error(400, "Bad Request");
1359                         }
1360                 }
1361         else {
1362                 &http_error(400, "Bad Request");
1363                 }
1364         }
1365 $method = $1;
1366 $request_uri = $page = $2;
1367 %header = ();
1368 local $lastheader;
1369 while(1) {
1370         ($headline = &read_line()) =~ s/\r|\n//g;
1371         last if ($headline eq "");
1372         print DEBUG "handle_request: got headline $headline\n";
1373         if ($headline =~ /^(\S+):\s*(.*)$/) {
1374                 $header{$lastheader = lc($1)} = $2;
1375                 }
1376         elsif ($headline =~ /^\s+(.*)$/) {
1377                 $header{$lastheader} .= $headline;
1378                 }
1379         else {
1380                 &http_error(400, "Bad Header $headline");
1381                 }
1382         }
1383 if (defined($header{'host'})) {
1384         if ($header{'host'} =~ /^([^:]+):([0-9]+)$/) {
1385                 ($host, $port) = ($1, $2);
1386                 }
1387         else {
1388                 $host = $header{'host'};
1389                 }
1390         if ($config{'musthost'} && $host ne $config{'musthost'}) {
1391                 # Disallowed hostname used
1392                 &http_error(400, "Invalid HTTP hostname");
1393                 }
1394         }
1395 undef(%in);
1396 if ($page =~ /^([^\?]+)\?(.*)$/) {
1397         # There is some query string information
1398         $page = $1;
1399         $querystring = $2;
1400         print DEBUG "handle_request: querystring=$querystring\n";
1401         if ($querystring !~ /=/) {
1402                 $queryargs = $querystring;
1403                 $queryargs =~ s/\+/ /g;
1404                 $queryargs =~ s/%(..)/pack("c",hex($1))/ge;
1405                 $querystring = "";
1406                 }
1407         else {
1408                 # Parse query-string parameters
1409                 local @in = split(/\&/, $querystring);
1410                 foreach $i (@in) {
1411                         local ($k, $v) = split(/=/, $i, 2);
1412                         $k =~ s/\+/ /g; $k =~ s/%(..)/pack("c",hex($1))/ge;
1413                         $v =~ s/\+/ /g; $v =~ s/%(..)/pack("c",hex($1))/ge;
1414                         $in{$k} = $v;
1415                         }
1416                 }
1417         }
1418 $posted_data = undef;
1419 if ($method eq 'POST' &&
1420     $header{'content-type'} eq 'application/x-www-form-urlencoded') {
1421         # Read in posted query string information, up the configured maximum
1422         # post request length
1423         $clen = $header{"content-length"};
1424         $clen_read = $clen > $config{'max_post'} ? $config{'max_post'} : $clen;
1425         while(length($posted_data) < $clen_read) {
1426                 $buf = &read_data($clen_read - length($posted_data));
1427                 if (!length($buf)) {
1428                         &http_error(500, "Failed to read POST request");
1429                         }
1430                 chomp($posted_data);
1431                 $posted_data =~ s/\015$//mg;
1432                 $posted_data .= $buf;
1433                 }
1434         print DEBUG "clen_read=$clen_read clen=$clen posted_data=",length($posted_data),"\n";
1435         if ($clen_read != $clen && length($posted_data) > $clen) {
1436                 # If the client sent more data than we asked for, chop the
1437                 # rest off
1438                 $posted_data = substr($posted_data, 0, $clen);
1439                 }
1440         if (length($posted_data) > $clen) {
1441                 # When the client sent too much, delay so that it gets headers
1442                 sleep(3);
1443                 }
1444         if ($header{'user-agent'} =~ /MSIE/ &&
1445             $header{'user-agent'} !~ /Opera/i) {
1446                 # MSIE includes an extra newline in the data
1447                 $posted_data =~ s/\r|\n//g;
1448                 }
1449         local @in = split(/\&/, $posted_data);
1450         foreach $i (@in) {
1451                 local ($k, $v) = split(/=/, $i, 2);
1452                 #$v =~ s/\r|\n//g;
1453                 $k =~ s/\+/ /g; $k =~ s/%(..)/pack("c",hex($1))/ge;
1454                 $v =~ s/\+/ /g; $v =~ s/%(..)/pack("c",hex($1))/ge;
1455                 $in{$k} = $v;
1456                 }
1457         print DEBUG "handle_request: posted_data=$posted_data\n";
1458         }
1459
1460 # Reject CONNECT request, which isn't supported
1461 if ($method eq "CONNECT") {
1462         &http_error(405, "Method $method is not supported");
1463         }
1464
1465 # work out accepted encodings
1466 %acceptenc = map { $_, 1 } split(/,/, $header{'accept-encoding'});
1467
1468 # replace %XX sequences in page
1469 $page =~ s/%(..)/pack("c",hex($1))/ge;
1470
1471 # Check if the browser's user agent indicates a mobile device
1472 $mobile_device = &is_mobile_useragent($header{'user-agent'});
1473
1474 # Check if Host: header is for a mobile URL
1475 foreach my $m (@mobile_prefixes) {
1476         if ($header{'host'} =~ /^\Q$m\E/i) {
1477                 $mobile_device = 1;
1478                 }
1479         }
1480
1481 # check for the logout flag file, and if existant deny authentication
1482 if ($config{'logout'} && -r $config{'logout'}.$in{'miniserv_logout_id'}) {
1483         print DEBUG "handle_request: logout flag set\n";
1484         $deny_authentication++;
1485         open(LOGOUT, $config{'logout'}.$in{'miniserv_logout_id'});
1486         chop($count = <LOGOUT>);
1487         close(LOGOUT);
1488         $count--;
1489         if ($count > 0) {
1490                 open(LOGOUT, ">$config{'logout'}$in{'miniserv_logout_id'}");
1491                 print LOGOUT "$count\n";
1492                 close(LOGOUT);
1493                 }
1494         else {
1495                 unlink($config{'logout'}.$in{'miniserv_logout_id'});
1496                 }
1497         }
1498
1499 # check for any redirect for the requested URL
1500 foreach my $pfx (@strip_prefix) {
1501         my $l = length($pfx);
1502         if(length($page) >= $l &&
1503            substr($page,0,$l) eq $pfx) {
1504                 $page=substr($page,$l);
1505                 last;
1506                 }
1507         }
1508 $simple = &simplify_path($page, $bogus);
1509 $rpath = $simple;
1510 $rpath .= "&".$querystring if (defined($querystring));
1511 $redir = $redirect{$rpath};
1512 if (defined($redir)) {
1513         print DEBUG "handle_request: redir=$redir\n";
1514         &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
1515         &write_data("Date: $datestr\r\n");
1516         &write_data("Server: $config{'server'}\r\n");
1517         local $ssl = $use_ssl || $config{'inetd_ssl'};
1518         $portstr = $port == 80 && !$ssl ? "" :
1519                    $port == 443 && $ssl ? "" : ":$port";
1520         $prot = $ssl ? "https" : "http";
1521         &write_data("Location: $prot://$host$portstr$redir\r\n");
1522         &write_keep_alive(0);
1523         &write_data("\r\n");
1524         return 0;
1525         }
1526
1527 # Check for a DAV request
1528 $davpath = undef;
1529 foreach my $d (@davpaths) {
1530         if ($simple eq $d || $simple =~ /^\Q$d\E\//) {
1531                 $davpath = $d;
1532                 last;
1533                 }
1534         }
1535 if (!$davpath && ($method eq "SEARCH" || $method eq "PUT")) {
1536         &http_error(400, "Bad Request method $method");
1537         }
1538
1539 # Check for password if needed
1540 if ($config{'userfile'}) {
1541         print DEBUG "handle_request: Need authentication\n";
1542         $validated = 0;
1543         $blocked = 0;
1544
1545         # Session authentication is never used for connections by
1546         # another webmin server, or for specified pages, or for DAV, or XMLRPC,
1547         # or mobile browsers if requested.
1548         if ($header{'user-agent'} =~ /webmin/i ||
1549             $header{'user-agent'} =~ /$config{'agents_nosession'}/i ||
1550             $sessiononly{$simple} || $davpath ||
1551             $simple eq "/xmlrpc.cgi" ||
1552             $acptip eq $config{'host_nosession'} ||
1553             $mobile_device && $config{'mobile_nosession'}) {
1554                 print DEBUG "handle_request: Forcing HTTP authentication\n";
1555                 $config{'session'} = 0;
1556                 }
1557
1558         # Check for SSL authentication
1559         if ($use_ssl && $verified_client) {
1560                 $peername = Net::SSLeay::X509_NAME_oneline(
1561                                 Net::SSLeay::X509_get_subject_name(
1562                                         Net::SSLeay::get_peer_certificate(
1563                                                 $ssl_con)));
1564                 $u = &find_user_by_cert($peername);
1565                 if ($u) {
1566                         $authuser = $u;
1567                         $validated = 2;
1568                         }
1569                 if ($use_syslog && !$validated) {
1570                         syslog("crit", "%s",
1571                                "Unknown SSL certificate $peername");
1572                         }
1573                 }
1574
1575         if (!$validated && !$deny_authentication) {
1576                 # check for IP-based authentication
1577                 local $a;
1578                 foreach $a (keys %ipaccess) {
1579                         if ($acptip eq $a) {
1580                                 # It does! Auth as the user
1581                                 $validated = 3;
1582                                 $baseauthuser = $authuser =
1583                                         $ipaccess{$a};
1584                                 }
1585                         }
1586                 }
1587
1588         # Check for normal HTTP authentication
1589         if (!$validated && !$deny_authentication && !$config{'session'} &&
1590             $header{authorization} =~ /^basic\s+(\S+)$/i) {
1591                 # authorization given..
1592                 ($authuser, $authpass) = split(/:/, &b64decode($1), 2);
1593                 print DEBUG "handle_request: doing basic auth check authuser=$authuser authpass=$authpass\n";
1594                 local ($vu, $expired, $nonexist) =
1595                         &validate_user($authuser, $authpass, $host,
1596                                        $acptip, $port);
1597                 print DEBUG "handle_request: vu=$vu expired=$expired nonexist=$nonexist\n";
1598                 if ($vu && (!$expired || $config{'passwd_mode'} == 1)) {
1599                         $authuser = $vu;
1600                         $validated = 1;
1601                         }
1602                 else {
1603                         $validated = 0;
1604                         }
1605                 if ($use_syslog && !$validated) {
1606                         syslog("crit", "%s",
1607                                ($nonexist ? "Non-existent" :
1608                                 $expired ? "Expired" : "Invalid").
1609                                " login as $authuser from $acpthost");
1610                         }
1611                 if ($authuser =~ /\r|\n|\s/) {
1612                         &http_error(500, "Invalid username",
1613                                     "Username contains invalid characters");
1614                         }
1615                 if ($authpass =~ /\r|\n/) {
1616                         &http_error(500, "Invalid password",
1617                                     "Password contains invalid characters");
1618                         }
1619
1620                 if ($config{'passdelay'} && !$config{'inetd'} && $authuser) {
1621                         # check with main process for delay
1622                         print DEBUG "handle_request: about to ask for password delay\n";
1623                         print $PASSINw "delay $authuser $acptip $validated\n";
1624                         <$PASSOUTr> =~ /(\d+) (\d+)/;
1625                         $blocked = $2;
1626                         print DEBUG "handle_request: password delay $1 $2\n";
1627                         sleep($1);
1628                         }
1629                 }
1630
1631         # Check for a visit to the special session login page
1632         if ($config{'session'} && !$deny_authentication &&
1633             $page eq $config{'session_login'}) {
1634                 if ($in{'logout'} && $header{'cookie'} =~ /(^|\s)$sidname=([a-f0-9]+)/) {
1635                         # Logout clicked .. remove the session
1636                         local $sid = $2;
1637                         print $PASSINw "delete $sid\n";
1638                         local $louser = <$PASSOUTr>;
1639                         chop($louser);
1640                         $logout = 1;
1641                         $already_session_id = undef;
1642                         $authuser = $baseauthuser = undef;
1643                         if ($louser) {
1644                                 if ($use_syslog) {
1645                                         syslog("info", "%s", "Logout by $louser from $acpthost");
1646                                         }
1647                                 &run_logout_script($louser, $sid,
1648                                                    $acptip, $localip);
1649                                 &write_logout_utmp($louser, $actphost);
1650                                 }
1651                         }
1652                 else {
1653                         # Validate the user
1654                         if ($in{'user'} =~ /\r|\n|\s/) {
1655                                 &http_error(500, "Invalid username",
1656                                     "Username contains invalid characters");
1657                                 }
1658                         if ($in{'pass'} =~ /\r|\n/) {
1659                                 &http_error(500, "Invalid password",
1660                                     "Password contains invalid characters");
1661                                 }
1662
1663                         local ($vu, $expired, $nonexist) =
1664                                 &validate_user($in{'user'}, $in{'pass'}, $host,
1665                                                $acptip, $port);
1666                         local $hrv = &handle_login(
1667                                         $vu || $in{'user'}, $vu ? 1 : 0,
1668                                         $expired, $nonexist, $in{'pass'},
1669                                         $in{'notestingcookie'});
1670                         return $hrv if (defined($hrv));
1671                         }
1672                 }
1673
1674         # Check for a visit to the special PAM login page
1675         if ($config{'session'} && !$deny_authentication &&
1676             $use_pam && $config{'pam_conv'} && $page eq $config{'pam_login'} &&
1677             !$in{'restart'}) {
1678                 # A question has been entered .. submit it to the main process
1679                 print DEBUG "handle_request: Got call to $page ($in{'cid'})\n";
1680                 print DEBUG "handle_request: For PAM, authuser=$authuser\n";
1681                 if ($in{'answer'} =~ /\r|\n/ || $in{'cid'} =~ /\r|\n|\s/) {
1682                         &http_error(500, "Invalid response",
1683                             "Response contains invalid characters");
1684                         }
1685
1686                 if (!$in{'cid'}) {
1687                         # Start of a new conversation - answer must be username
1688                         $cid = &generate_random_id($in{'answer'});
1689                         print $PASSINw "pamstart $cid $host $in{'answer'}\n";
1690                         }
1691                 else {
1692                         # A response to a previous question
1693                         $cid = $in{'cid'};
1694                         print $PASSINw "pamanswer $cid $in{'answer'}\n";
1695                         }
1696
1697                 # Read back the response, and the next question (if any)
1698                 local $line = <$PASSOUTr>;
1699                 $line =~ s/\r|\n//g;
1700                 local ($rv, $question) = split(/\s+/, $line, 2);
1701                 if ($rv == 0) {
1702                         # Cannot login!
1703                         local $hrv = &handle_login(
1704                                 !$in{'cid'} && $in{'answer'} ? $in{'answer'}
1705                                                              : "unknown",
1706                                 0, 0, 1, undef);
1707                         return $hrv if (defined($hrv));
1708                         }
1709                 elsif ($rv == 1 || $rv == 3) {
1710                         # Another question .. force use of PAM CGI
1711                         $validated = 1;
1712                         $method = "GET";
1713                         $querystring .= "&cid=$cid&question=".
1714                                         &urlize($question);
1715                         $querystring .= "&password=1" if ($rv == 3);
1716                         $queryargs = "";
1717                         $page = $config{'pam_login'};
1718                         $miniserv_internal = 1;
1719                         $logged_code = 401;
1720                         }
1721                 elsif ($rv == 2) {
1722                         # Got back a final ok or failure
1723                         local ($user, $ok, $expired, $nonexist) =
1724                                 split(/\s+/, $question);
1725                         local $hrv = &handle_login(
1726                                 $user, $ok, $expired, $nonexist, undef,
1727                                 $in{'notestingcookie'});
1728                         return $hrv if (defined($hrv));
1729                         }
1730                 elsif ($rv == 4) {
1731                         # A message from PAM .. tell the user
1732                         $validated = 1;
1733                         $method = "GET";
1734                         $querystring .= "&cid=$cid&message=".
1735                                         &urlize($question);
1736                         $queryargs = "";
1737                         $page = $config{'pam_login'};
1738                         $miniserv_internal = 1;
1739                         $logged_code = 401;
1740                         }
1741                 }
1742
1743         # Check for a visit to the special password change page
1744         if ($config{'session'} && !$deny_authentication &&
1745             $page eq $config{'password_change'} && !$validated) {
1746                 # Just let this slide ..
1747                 $validated = 1;
1748                 $miniserv_internal = 3;
1749                 }
1750
1751         # Check for an existing session
1752         if ($config{'session'} && !$validated) {
1753                 if ($already_session_id) {
1754                         $session_id = $already_session_id;
1755                         $authuser = $already_authuser;
1756                         $validated = 1;
1757                         }
1758                 elsif (!$deny_authentication &&
1759                        $header{'cookie'} =~ /(^|\s)$sidname=([a-f0-9]+)/) {
1760                         # Try all session cookies
1761                         local $cookie = $header{'cookie'};
1762                         while($cookie =~ s/(^|\s)$sidname=([a-f0-9]+)//) {
1763                                 $session_id = $2;
1764                                 local $notimeout =
1765                                         $in{'webmin_notimeout'} ? 1 : 0;
1766                                 print $PASSINw "verify $session_id $notimeout\n";
1767                                 <$PASSOUTr> =~ /(\d+)\s+(\S+)/;
1768                                 if ($1 == 2) {
1769                                         # Valid session continuation
1770                                         $validated = 1;
1771                                         $authuser = $2;
1772                                         $already_authuser = $authuser;
1773                                         $timed_out = undef;
1774                                         last;
1775                                         }
1776                                 elsif ($1 == 1) {
1777                                         # Session timed out
1778                                         $timed_out = $2;
1779                                         }
1780                                 else {
1781                                         # Invalid session ID .. don't set
1782                                         # verified flag
1783                                         }
1784                                 }
1785                         }
1786                 }
1787
1788         # Check for local authentication
1789         if ($localauth_user && !$header{'x-forwarded-for'} && !$header{'via'}) {
1790                 my $luser = &get_user_details($localauth_user);
1791                 if ($luser) {
1792                         # Local user exists in webmin users file
1793                         $validated = 1;
1794                         $authuser = $localauth_user;
1795                         }
1796                 else {
1797                         # Check if local user is allowed by unixauth
1798                         local @can = &can_user_login($localauth_user,
1799                                                      undef, $host);
1800                         if ($can[0]) {
1801                                 $validated = 2;
1802                                 $authuser = $localauth_user;
1803                                 }
1804                         else {
1805                                 $localauth_user = undef;
1806                                 }
1807                         }
1808                 }
1809
1810         if (!$validated) {
1811                 # Check if this path allows anonymous access
1812                 local $a;
1813                 foreach $a (keys %anonymous) {
1814                         if (substr($simple, 0, length($a)) eq $a) {
1815                                 # It does! Auth as the user, if IP access
1816                                 # control allows him.
1817                                 if (&check_user_ip($anonymous{$a}) &&
1818                                     &check_user_time($anonymous{$a})) {
1819                                         $validated = 3;
1820                                         $baseauthuser = $authuser =
1821                                                 $anonymous{$a};
1822                                         }
1823                                 }
1824                         }
1825                 }
1826
1827         if (!$validated) {
1828                 # Check if this path allows unauthenticated access
1829                 local ($u, $unauth);
1830                 foreach $u (@unauth) {
1831                         $unauth++ if ($simple =~ /$u/);
1832                         }
1833                 if (!$bogus && $unauth) {
1834                         # Unauthenticated directory or file request - approve it
1835                         $validated = 4;
1836                         $baseauthuser = $authuser = undef;
1837                         }
1838                 }
1839
1840         if (!$validated) {
1841                 if ($blocked == 0) {
1842                         # No password given.. ask
1843                         if ($config{'pam_conv'} && $use_pam) {
1844                                 # Force CGI for PAM question, starting with
1845                                 # the username which is always needed
1846                                 $validated = 1;
1847                                 $method = "GET";
1848                                 $querystring .= "&initial=1&question=".
1849                                                 &urlize("Username");
1850                                 $querystring .= "&failed=$failed_user" if ($failed_user);
1851                                 $querystring .= "&timed_out=$timed_out" if ($timed_out);
1852                                 $queryargs = "";
1853                                 $page = $config{'pam_login'};
1854                                 $miniserv_internal = 1;
1855                                 $logged_code = 401;
1856                                 }
1857                         elsif ($config{'session'}) {
1858                                 # Force CGI for session login
1859                                 $validated = 1;
1860                                 if ($logout) {
1861                                         $querystring .= "&logout=1&page=/";
1862                                         }
1863                                 else {
1864                                         # Re-direct to current module only
1865                                         local $rpage = $request_uri;
1866                                         if (!$config{'loginkeeppage'}) {
1867                                                 $rpage =~ s/\?.*$//;
1868                                                 $rpage =~ s/[^\/]+$//
1869                                                 }
1870                                         $querystring = "page=".&urlize($rpage);
1871                                         }
1872                                 $method = "GET";
1873                                 $querystring .= "&failed=$failed_user" if ($failed_user);
1874                                 $querystring .= "&timed_out=$timed_out" if ($timed_out);
1875                                 $queryargs = "";
1876                                 $page = $config{'session_login'};
1877                                 $miniserv_internal = 1;
1878                                 $logged_code = 401;
1879                                 }
1880                         else {
1881                                 # Ask for login with HTTP authentication
1882                                 &write_data("HTTP/1.0 401 Unauthorized\r\n");
1883                                 &write_data("Date: $datestr\r\n");
1884                                 &write_data("Server: $config{'server'}\r\n");
1885                                 &write_data("WWW-authenticate: Basic ".
1886                                            "realm=\"$config{'realm'}\"\r\n");
1887                                 &write_keep_alive(0);
1888                                 &write_data("Content-type: text/html; Charset=iso-8859-1\r\n");
1889                                 &write_data("\r\n");
1890                                 &reset_byte_count();
1891                                 &write_data("<html>\n");
1892                                 &write_data("<head><title>Unauthorized</title></head>\n");
1893                                 &write_data("<body><h1>Unauthorized</h1>\n");
1894                                 &write_data("A password is required to access this\n");
1895                                 &write_data("web server. Please try again. <p>\n");
1896                                 &write_data("</body></html>\n");
1897                                 &log_request($acpthost, undef, $reqline, 401, &byte_count());
1898                                 return 0;
1899                                 }
1900                         }
1901                 elsif ($blocked == 1) {
1902                         # when the host has been blocked, give it an error
1903                         &http_error(403, "Access denied for $acptip. The host ".
1904                                          "has been blocked because of too ".
1905                                          "many authentication failures.");
1906                         }
1907                 elsif ($blocked == 2) {
1908                         # when the user has been blocked, give it an error
1909                         &http_error(403, "Access denied. The user ".
1910                                          "has been blocked because of too ".
1911                                          "many authentication failures.");
1912                         }
1913                 }
1914         else {
1915                 # Get the real Webmin username
1916                 local @can = &can_user_login($authuser, undef, $host);
1917                 $baseauthuser = $can[3] || $authuser;
1918
1919                 if ($config{'remoteuser'} && !$< && $validated) {
1920                         # Switch to the UID of the remote user (if he exists)
1921                         local @u = getpwnam($authuser);
1922                         if (@u && $< != $u[2]) {
1923                                 $( = $u[3]; $) = "$u[3] $u[3]";
1924                                 ($>, $<) = ($u[2], $u[2]);
1925                                 }
1926                         else {
1927                                 &http_error(500, "Unix user $authuser does not exist");
1928                                 return 0;
1929                                 }
1930                         }
1931                 }
1932
1933         # Check per-user IP access control
1934         if (!&check_user_ip($baseauthuser)) {
1935                 &http_error(403, "Access denied for $acptip for $baseauthuser");
1936                 return 0;
1937                 }
1938
1939         # Check per-user allowed times
1940         if (!&check_user_time($baseauthuser)) {
1941                 &http_error(403, "Access denied at the current time");
1942                 return 0;
1943                 }
1944         }
1945 $uinfo = &get_user_details($baseauthuser);
1946
1947 # Validate the path, and convert to canonical form
1948 rerun:
1949 $simple = &simplify_path($page, $bogus);
1950 print DEBUG "handle_request: page=$page simple=$simple\n";
1951 if ($bogus) {
1952         &http_error(400, "Invalid path");
1953         }
1954
1955 # Check for a DAV request
1956 if ($davpath) {
1957         return &handle_dav_request($davpath);
1958         }
1959
1960 # Work out the active theme(s)
1961 local $preroots = $mobile_device && defined($config{'mobile_preroot'}) ?
1962                         $config{'mobile_preroot'} :
1963                  $authuser && defined($config{'preroot_'.$authuser}) ?
1964                         $config{'preroot_'.$authuser} :
1965                  $uinfo && defined($uinfo->{'preroot'}) ?
1966                         $uinfo->{'preroot'} :
1967                         $config{'preroot'};
1968 local @preroots = reverse(split(/\s+/, $preroots));
1969
1970 # Canonicalize the directories
1971 foreach my $preroot (@preroots) {
1972         # Always under the current webmin root
1973         $preroot =~ s/^.*\///g;
1974         $preroot = $roots[0].'/'.$preroot;
1975         }
1976
1977 # Look in the theme root directories first
1978 local ($full, @stfull);
1979 $foundroot = undef;
1980 foreach my $preroot (@preroots) {
1981         $is_directory = 1;
1982         $sofar = "";
1983         $full = $preroot.$sofar;
1984         $scriptname = $simple;
1985         foreach $b (split(/\//, $simple)) {
1986                 if ($b ne "") { $sofar .= "/$b"; }
1987                 $full = $preroot.$sofar;
1988                 @stfull = stat($full);
1989                 if (!@stfull) { undef($full); last; }
1990
1991                 # Check if this is a directory
1992                 if (-d _) {
1993                         # It is.. go on parsing
1994                         $is_directory = 1;
1995                         next;
1996                         }
1997                 else {
1998                         $is_directory = 0;
1999                         }
2000
2001                 # Check if this is a CGI program
2002                 if (&get_type($full) eq "internal/cgi") {
2003                         $pathinfo = substr($simple, length($sofar));
2004                         $pathinfo .= "/" if ($page =~ /\/$/);
2005                         $scriptname = $sofar;
2006                         last;
2007                         }
2008                 }
2009
2010         # Don't stop at a directory unless this is the last theme, which
2011         # is the 'real' one that provides the .cgi scripts
2012         if ($is_directory && $preroot ne $preroots[$#preroots]) {
2013                 next;
2014                 }
2015
2016         if ($full) {
2017                 # Found it!
2018                 if ($sofar eq '') {
2019                         $cgi_pwd = $roots[0];
2020                         }
2021                 elsif ($is_directory) {
2022                         $cgi_pwd = "$roots[0]$sofar";
2023                         }
2024                 else {
2025                         "$roots[0]$sofar" =~ /^(.*\/)[^\/]+$/;
2026                         $cgi_pwd = $1;
2027                         }
2028                 $foundroot = $preroot;
2029                 if ($is_directory) {
2030                         # Check for index files in the directory
2031                         local $foundidx;
2032                         foreach $idx (split(/\s+/, $config{"index_docs"})) {
2033                                 $idxfull = "$full/$idx";
2034                                 local @stidxfull = stat($idxfull);
2035                                 if (-r _ && !-d _) {
2036                                         $full = $idxfull;
2037                                         @stfull = @stidxfull;
2038                                         $is_directory = 0;
2039                                         $scriptname .= "/"
2040                                                 if ($scriptname ne "/");
2041                                         $foundidx++;
2042                                         last;
2043                                         }
2044                                 }
2045                         @stfull = stat($full) if (!$foundidx);
2046                         }
2047                 }
2048         last if ($foundroot);
2049         }
2050 print DEBUG "handle_request: initial full=$full\n";
2051
2052 # Look in the real root directories, stopping when we find a file or directory
2053 if (!$full || $is_directory) {
2054         ROOT: foreach $root (@roots) {
2055                 $sofar = "";
2056                 $full = $root.$sofar;
2057                 $scriptname = $simple;
2058                 foreach $b ($simple eq "/" ? ( "" ) : split(/\//, $simple)) {
2059                         if ($b ne "") { $sofar .= "/$b"; }
2060                         $full = $root.$sofar;
2061                         @stfull = stat($full);
2062                         if (!@stfull) {
2063                                 next ROOT;
2064                                 }
2065
2066                         # Check if this is a directory
2067                         if (-d _) {
2068                                 # It is.. go on parsing
2069                                 next;
2070                                 }
2071
2072                         # Check if this is a CGI program
2073                         if (&get_type($full) eq "internal/cgi") {
2074                                 $pathinfo = substr($simple, length($sofar));
2075                                 $pathinfo .= "/" if ($page =~ /\/$/);
2076                                 $scriptname = $sofar;
2077                                 last;
2078                                 }
2079                         }
2080
2081                 # Run CGI in the same directory as whatever file
2082                 # was requested
2083                 $full =~ /^(.*\/)[^\/]+$/; $cgi_pwd = $1;
2084
2085                 if (-e $full) {
2086                         # Found something!
2087                         $realroot = $root;
2088                         $foundroot = $root;
2089                         last;
2090                         }
2091                 }
2092         if (!@stfull) { &http_error(404, "File not found"); }
2093         }
2094 print DEBUG "handle_request: full=$full\n";
2095 @stfull = stat($full) if (!@stfull);
2096
2097 # check filename against denyfile regexp
2098 local $denyfile = $config{'denyfile'};
2099 if ($denyfile && $full =~ /$denyfile/) {
2100         &http_error(403, "Access denied to $page");
2101         return 0;
2102         }
2103
2104 # Reached the end of the path OK.. see what we've got
2105 if (-d _) {
2106         # See if the URL ends with a / as it should
2107         print DEBUG "handle_request: found a directory\n";
2108         if ($page !~ /\/$/) {
2109                 # It doesn't.. redirect
2110                 &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
2111                 $ssl = $use_ssl || $config{'inetd_ssl'};
2112                 $portstr = $port == 80 && !$ssl ? "" :
2113                            $port == 443 && $ssl ? "" : ":$port";
2114                 &write_data("Date: $datestr\r\n");
2115                 &write_data("Server: $config{server}\r\n");
2116                 $prot = $ssl ? "https" : "http";
2117                 &write_data("Location: $prot://$host$portstr$page/\r\n");
2118                 &write_keep_alive(0);
2119                 &write_data("\r\n");
2120                 &log_request($acpthost, $authuser, $reqline, 302, 0);
2121                 return 0;
2122                 }
2123         # A directory.. check for index files
2124         local $foundidx;
2125         foreach $idx (split(/\s+/, $config{"index_docs"})) {
2126                 $idxfull = "$full/$idx";
2127                 @stidxfull = stat($idxfull);
2128                 if (-r _ && !-d _) {
2129                         $cgi_pwd = $full;
2130                         $full = $idxfull;
2131                         @stfull = @stidxfull;
2132                         $scriptname .= "/" if ($scriptname ne "/");
2133                         $foundidx++;
2134                         last;
2135                         }
2136                 }
2137         @stfull = stat($full) if (!$foundidx);
2138         }
2139 if (-d _) {
2140         # This is definately a directory.. list it
2141         print DEBUG "handle_request: listing directory\n";
2142         local $resp = "HTTP/1.0 $ok_code $ok_message\r\n".
2143                       "Date: $datestr\r\n".
2144                       "Server: $config{server}\r\n".
2145                       "Content-type: text/html; Charset=iso-8859-1\r\n";
2146         &write_data($resp);
2147         &write_keep_alive(0);
2148         &write_data("\r\n");
2149         &reset_byte_count();
2150         &write_data("<h1>Index of $simple</h1>\n");
2151         &write_data("<pre>\n");
2152         &write_data(sprintf "%-35.35s %-20.20s %-10.10s\n",
2153                         "Name", "Last Modified", "Size");
2154         &write_data("<hr>\n");
2155         opendir(DIR, $full);
2156         while($df = readdir(DIR)) {
2157                 if ($df =~ /^\./) { next; }
2158                 $fulldf = $full eq "/" ? $full.$df : $full."/".$df;
2159                 (@stbuf = stat($fulldf)) || next;
2160                 if (-d _) { $df .= "/"; }
2161                 @tm = localtime($stbuf[9]);
2162                 $fdate = sprintf "%2.2d/%2.2d/%4.4d %2.2d:%2.2d:%2.2d",
2163                                 $tm[3],$tm[4]+1,$tm[5]+1900,
2164                                 $tm[0],$tm[1],$tm[2];
2165                 $len = length($df); $rest = " "x(35-$len);
2166                 &write_data(sprintf
2167                  "<a href=\"%s\">%-${len}.${len}s</a>$rest %-20.20s %-10.10s\n",
2168                  $df, $df, $fdate, $stbuf[7]);
2169                 }
2170         closedir(DIR);
2171         &log_request($acpthost, $authuser, $reqline, $ok_code, &byte_count());
2172         return 0;
2173         }
2174
2175 # CGI or normal file
2176 local $rv;
2177 if (&get_type($full) eq "internal/cgi" && $validated != 4) {
2178         # A CGI program to execute
2179         print DEBUG "handle_request: executing CGI\n";
2180         $envtz = $ENV{"TZ"};
2181         $envuser = $ENV{"USER"};
2182         $envpath = $ENV{"PATH"};
2183         $envlang = $ENV{"LANG"};
2184         $envroot = $ENV{"SystemRoot"};
2185         $envperllib = $ENV{'PERLLIB'};
2186         foreach my $k (keys %ENV) {
2187                 delete($ENV{$k});
2188                 }
2189         $ENV{"PATH"} = $envpath if ($envpath);
2190         $ENV{"TZ"} = $envtz if ($envtz);
2191         $ENV{"USER"} = $envuser if ($envuser);
2192         $ENV{"OLD_LANG"} = $envlang if ($envlang);
2193         $ENV{"SystemRoot"} = $envroot if ($envroot);
2194         $ENV{'PERLLIB'} = $envperllib if ($envperllib);
2195         $ENV{"HOME"} = $user_homedir;
2196         $ENV{"SERVER_SOFTWARE"} = $config{"server"};
2197         $ENV{"SERVER_NAME"} = $host;
2198         $ENV{"SERVER_ADMIN"} = $config{"email"};
2199         $ENV{"SERVER_ROOT"} = $roots[0];
2200         $ENV{"SERVER_REALROOT"} = $realroot;
2201         $ENV{"SERVER_PORT"} = $port;
2202         $ENV{"REMOTE_HOST"} = $acpthost;
2203         $ENV{"REMOTE_ADDR"} = $acptip;
2204         $ENV{"REMOTE_ADDR_PROTOCOL"} = $ipv6 ? 6 : 4;
2205         $ENV{"REMOTE_USER"} = $authuser;
2206         $ENV{"BASE_REMOTE_USER"} = $authuser ne $baseauthuser ?
2207                                         $baseauthuser : undef;
2208         $ENV{"REMOTE_PASS"} = $authpass if (defined($authpass) &&
2209                                             $config{'pass_password'});
2210         if ($uinfo && $uinfo->{'proto'}) {
2211                 $ENV{"REMOTE_USER_PROTO"} = $uinfo->{'proto'};
2212                 $ENV{"REMOTE_USER_ID"} = $uinfo->{'id'};
2213                 }
2214         print DEBUG "REMOTE_USER = ",$ENV{"REMOTE_USER"},"\n";
2215         print DEBUG "BASE_REMOTE_USER = ",$ENV{"BASE_REMOTE_USER"},"\n";
2216         print DEBUG "proto=$uinfo->{'proto'} id=$uinfo->{'id'}\n" if ($uinfo);
2217         $ENV{"SSL_USER"} = $peername if ($validated == 2);
2218         $ENV{"ANONYMOUS_USER"} = "1" if ($validated == 3 || $validated == 4);
2219         $ENV{"DOCUMENT_ROOT"} = $roots[0];
2220         $ENV{"DOCUMENT_REALROOT"} = $realroot;
2221         $ENV{"GATEWAY_INTERFACE"} = "CGI/1.1";
2222         $ENV{"SERVER_PROTOCOL"} = "HTTP/1.0";
2223         $ENV{"REQUEST_METHOD"} = $method;
2224         $ENV{"SCRIPT_NAME"} = $scriptname;
2225         $ENV{"SCRIPT_FILENAME"} = $full;
2226         $ENV{"REQUEST_URI"} = $request_uri;
2227         $ENV{"PATH_INFO"} = $pathinfo;
2228         if ($pathinfo) {
2229                 $ENV{"PATH_TRANSLATED"} = "$roots[0]$pathinfo";
2230                 $ENV{"PATH_REALTRANSLATED"} = "$realroot$pathinfo";
2231                 }
2232         $ENV{"QUERY_STRING"} = $querystring;
2233         $ENV{"MINISERV_CONFIG"} = $config_file;
2234         $ENV{"HTTPS"} = $use_ssl || $config{'inetd_ssl'} ? "ON" : "";
2235         $ENV{"MINISERV_PID"} = $miniserv_main_pid;
2236         $ENV{"SESSION_ID"} = $session_id if ($session_id);
2237         $ENV{"LOCAL_USER"} = $localauth_user if ($localauth_user);
2238         $ENV{"MINISERV_INTERNAL"} = $miniserv_internal if ($miniserv_internal);
2239         if (defined($header{"content-length"})) {
2240                 $ENV{"CONTENT_LENGTH"} = $header{"content-length"};
2241                 }
2242         if (defined($header{"content-type"})) {
2243                 $ENV{"CONTENT_TYPE"} = $header{"content-type"};
2244                 }
2245         foreach $h (keys %header) {
2246                 ($hname = $h) =~ tr/a-z/A-Z/;
2247                 $hname =~ s/\-/_/g;
2248                 $ENV{"HTTP_$hname"} = $header{$h};
2249                 }
2250         $ENV{"PWD"} = $cgi_pwd;
2251         foreach $k (keys %config) {
2252                 if ($k =~ /^env_(\S+)$/) {
2253                         $ENV{$1} = $config{$k};
2254                         }
2255                 }
2256         delete($ENV{'HTTP_AUTHORIZATION'});
2257         $ENV{'HTTP_COOKIE'} =~ s/;?\s*$sidname=([a-f0-9]+)//;
2258         $ENV{'MOBILE_DEVICE'} = 1 if ($mobile_device);
2259
2260         # Check if the CGI can be handled internally
2261         open(CGI, $full);
2262         local $first = <CGI>;
2263         close(CGI);
2264         $first =~ s/[#!\r\n]//g;
2265         $nph_script = ($full =~ /\/nph-([^\/]+)$/);
2266         seek(STDERR, 0, 2);
2267         if (!$config{'forkcgis'} &&
2268             ($first eq $perl_path || $first eq $linked_perl_path) &&
2269               $] >= 5.004 ||
2270             $config{'internalcgis'}) {
2271                 # setup environment for eval
2272                 chdir($ENV{"PWD"});
2273                 @ARGV = split(/\s+/, $queryargs);
2274                 $0 = $full;
2275                 if ($posted_data) {
2276                         # Already read the post input
2277                         $postinput = $posted_data;
2278                         }
2279                 $clen = $header{"content-length"};
2280                 $SIG{'CHLD'} = 'DEFAULT';
2281                 eval {
2282                         # Have SOCK closed if the perl exec's something
2283                         use Fcntl;
2284                         fcntl(SOCK, F_SETFD, FD_CLOEXEC);
2285                         };
2286                 #shutdown(SOCK, 0);
2287
2288                 if ($config{'log'}) {
2289                         open(MINISERVLOG, ">>$config{'logfile'}");
2290                         if ($config{'logperms'}) {
2291                                 chmod(oct($config{'logperms'}),
2292                                       $config{'logfile'});
2293                                 }
2294                         else {
2295                                 chmod(0600, $config{'logfile'});
2296                                 }
2297                         }
2298                 $doing_cgi_eval = 1;
2299                 $main_process_id = $$;
2300                 $pkg = "main";
2301                 if ($full =~ /^\Q$foundroot\E\/([^\/]+)\//) {
2302                         # Eval in package from Webmin module name
2303                         $pkg = $1;
2304                         $pkg =~ s/[^A-Za-z0-9]/_/g;
2305                         }
2306                 eval "
2307                         \%pkg::ENV = \%ENV;
2308                         package $pkg;
2309                         tie(*STDOUT, 'miniserv');
2310                         tie(*STDIN, 'miniserv');
2311                         do \$miniserv::full;
2312                         die \$@ if (\$@);
2313                         ";
2314                 $doing_cgi_eval = 0;
2315                 if ($@) {
2316                         # Error in perl!
2317                         &http_error(500, "Perl execution failed",
2318                                     $config{'noshowstderr'} ? undef : $@);
2319                         }
2320                 elsif (!$doneheaders && !$nph_script) {
2321                         &http_error(500, "Missing Headers");
2322                         }
2323                 $rv = 0;
2324                 }
2325         else {
2326                 $infile = undef;
2327                 if (!$on_windows) {
2328                         # fork the process that actually executes the CGI
2329                         pipe(CGIINr, CGIINw);
2330                         pipe(CGIOUTr, CGIOUTw);
2331                         pipe(CGIERRr, CGIERRw);
2332                         if (!($cgipid = fork())) {
2333                                 @execargs = ( $full, split(/\s+/, $queryargs) );
2334                                 chdir($ENV{"PWD"});
2335                                 close(SOCK);
2336                                 open(STDIN, "<&CGIINr");
2337                                 open(STDOUT, ">&CGIOUTw");
2338                                 open(STDERR, ">&CGIERRw");
2339                                 close(CGIINw); close(CGIOUTr); close(CGIERRr);
2340                                 exec(@execargs) ||
2341                                         die "Failed to exec $full : $!\n";
2342                                 exit(0);
2343                                 }
2344                         close(CGIINr); close(CGIOUTw); close(CGIERRw);
2345                         }
2346                 else {
2347                         # write CGI input to a temp file
2348                         $infile = "$config{'tempbase'}.$$";
2349                         open(CGIINw, ">$infile");
2350                         # NOT binary mode, as CGIs don't read in it!
2351                         }
2352
2353                 # send post data
2354                 if ($posted_data) {
2355                         # already read the posted data
2356                         print CGIINw $posted_data;
2357                         }
2358                 $clen = $header{"content-length"};
2359                 if ($method eq "POST" && $clen_read < $clen) {
2360                         $SIG{'PIPE'} = 'IGNORE';
2361                         $got = $clen_read;
2362                         while($got < $clen) {
2363                                 $buf = &read_data($clen-$got);
2364                                 if (!length($buf)) {
2365                                         kill('TERM', $cgipid);
2366                                         unlink($infile) if ($infile);
2367                                         &http_error(500, "Failed to read ".
2368                                                          "POST request");
2369                                         }
2370                                 $got += length($buf);
2371                                 local ($wrote) = (print CGIINw $buf);
2372                                 last if (!$wrote);
2373                                 }
2374                         # If the CGI terminated early, we still need to read
2375                         # from the browser and throw away
2376                         while($got < $clen) {
2377                                 $buf = &read_data($clen-$got);
2378                                 if (!length($buf)) {
2379                                         kill('TERM', $cgipid);
2380                                         unlink($infile) if ($infile);
2381                                         &http_error(500, "Failed to read ".
2382                                                          "POST request");
2383                                         }
2384                                 $got += length($buf);
2385                                 }
2386                         $SIG{'PIPE'} = 'DEFAULT';
2387                         }
2388                 close(CGIINw);
2389                 shutdown(SOCK, 0);
2390
2391                 if ($on_windows) {
2392                         # Run the CGI program, and feed it input
2393                         chdir($ENV{"PWD"});
2394                         local $qqueryargs = join(" ", map { "\"$_\"" }
2395                                                  split(/\s+/, $queryargs));
2396                         if ($first =~ /(perl|perl.exe)$/i) {
2397                                 # On Windows, run with Perl
2398                                 open(CGIOUTr, "$perl_path \"$full\" $qqueryargs <$infile |");
2399                                 }
2400                         else {
2401                                 open(CGIOUTr, "\"$full\" $qqueryargs <$infile |");
2402                                 }
2403                         binmode(CGIOUTr);
2404                         }
2405
2406                 if (!$nph_script) {
2407                         # read back cgi headers
2408                         select(CGIOUTr); $|=1; select(STDOUT);
2409                         $got_blank = 0;
2410                         while(1) {
2411                                 $line = <CGIOUTr>;
2412                                 $line =~ s/\r|\n//g;
2413                                 if ($line eq "") {
2414                                         if ($got_blank || %cgiheader) { last; }
2415                                         $got_blank++;
2416                                         next;
2417                                         }
2418                                 if ($line !~ /^(\S+):\s+(.*)$/) {
2419                                         $errs = &read_errors(CGIERRr);
2420                                         close(CGIOUTr); close(CGIERRr);
2421                                         unlink($infile) if ($infile);
2422                                         &http_error(500, "Bad Header", $errs);
2423                                         }
2424                                 $cgiheader{lc($1)} = $2;
2425                                 push(@cgiheader, [ $1, $2 ]);
2426                                 }
2427                         if ($cgiheader{"location"}) {
2428                                 &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
2429                                 &write_data("Date: $datestr\r\n");
2430                                 &write_data("Server: $config{'server'}\r\n");
2431                                 &write_keep_alive(0);
2432                                 # ignore the rest of the output. This is a hack,
2433                                 # but is necessary for IE in some cases :(
2434                                 close(CGIOUTr); close(CGIERRr);
2435                                 }
2436                         elsif ($cgiheader{"content-type"} eq "") {
2437                                 close(CGIOUTr); close(CGIERRr);
2438                                 unlink($infile) if ($infile);
2439                                 $errs = &read_errors(CGIERRr);
2440                                 &http_error(500, "Missing Content-Type Header",
2441                                     $config{'noshowstderr'} ? undef : $errs);
2442                                 }
2443                         else {
2444                                 &write_data("HTTP/1.0 $ok_code $ok_message\r\n");
2445                                 &write_data("Date: $datestr\r\n");
2446                                 &write_data("Server: $config{'server'}\r\n");
2447                                 &write_keep_alive(0);
2448                                 }
2449                         foreach $h (@cgiheader) {
2450                                 &write_data("$h->[0]: $h->[1]\r\n");
2451                                 }
2452                         &write_data("\r\n");
2453                         }
2454                 &reset_byte_count();
2455                 while($line = <CGIOUTr>) {
2456                         &write_data($line);
2457                         }
2458                 close(CGIOUTr);
2459                 close(CGIERRr);
2460                 unlink($infile) if ($infile);
2461                 $rv = 0;
2462                 }
2463         }
2464 else {
2465         # A file to output
2466         print DEBUG "handle_request: outputting file $full\n";
2467         $gzfile = $full.".gz";
2468         $gzipped = 0;
2469         if ($config{'gzip'} ne '0' && -r $gzfile && $acceptenc{'gzip'}) {
2470                 # Using gzipped version
2471                 @stopen = stat($gzfile);
2472                 if ($stopen[9] >= $stfull[9] && open(FILE, $gzfile)) {
2473                         print DEBUG "handle_request: using gzipped $gzfile\n";
2474                         $gzipped = 1;
2475                         }
2476                 }
2477         if (!$gzipped) {
2478                 # Using original file
2479                 @stopen = @stfull;
2480                 open(FILE, $full) || &http_error(404, "Failed to open file");
2481                 }
2482         binmode(FILE);
2483
2484         # Build common headers
2485         local $resp = "HTTP/1.0 $ok_code $ok_message\r\n".
2486                       "Date: $datestr\r\n".
2487                       "Server: $config{server}\r\n".
2488                       "Content-type: ".&get_type($full)."\r\n".
2489                       "Last-Modified: ".&http_date($stopen[9])."\r\n".
2490                       "Expires: ".
2491                         &http_date(time()+&get_expires_time($simple))."\r\n";
2492
2493         if (!$gzipped && $use_gzip && $acceptenc{'gzip'} &&
2494             &should_gzip_file($full)) {
2495                 # Load and compress file, then output
2496                 print DEBUG "handle_request: outputting gzipped file $full\n";
2497                 open(FILE, $full) || &http_error(404, "Failed to open file");
2498                 {
2499                         local $/ = undef;
2500                         $data = <FILE>;
2501                 }
2502                 close(FILE);
2503                 @stopen = stat($file);
2504                 $data = Compress::Zlib::memGzip($data);
2505                 $resp .= "Content-length: ".length($data)."\r\n".
2506                          "Content-Encoding: gzip\r\n";
2507                 &write_data($resp);
2508                 $rv = &write_keep_alive();
2509                 &write_data("\r\n");
2510                 &reset_byte_count();
2511                 &write_data($data);
2512                 }
2513         else {
2514                 # Stream file output
2515                 $resp .= "Content-length: $stopen[7]\r\n";
2516                 $resp .= "Content-Encoding: gzip\r\n" if ($gzipped);
2517                 &write_data($resp);
2518                 $rv = &write_keep_alive();
2519                 &write_data("\r\n");
2520                 &reset_byte_count();
2521                 my $bufsize = $config{'bufsize'} || 1024;
2522                 while(read(FILE, $buf, $bufsize) > 0) {
2523                         &write_data($buf);
2524                         }
2525                 close(FILE);
2526                 }
2527         }
2528
2529 # log the request
2530 &log_request($acpthost, $authuser, $reqline,
2531              $logged_code ? $logged_code :
2532              $cgiheader{"location"} ? "302" : $ok_code, &byte_count());
2533 return $rv;
2534 }
2535
2536 # http_error(code, message, body, [dontexit])
2537 sub http_error
2538 {
2539 local $eh = $error_handler_recurse ? undef :
2540             $config{"error_handler_$_[0]"} ? $config{"error_handler_$_[0]"} :
2541             $config{'error_handler'} ? $config{'error_handler'} : undef;
2542 print DEBUG "http_error code=$_[0] message=$_[1] body=$_[2]\n";
2543 if ($eh) {
2544         # Call a CGI program for the error
2545         $page = "/$eh";
2546         $querystring = "code=$_[0]&message=".&urlize($_[1]).
2547                        "&body=".&urlize($_[2]);
2548         $error_handler_recurse++;
2549         $ok_code = $_[0];
2550         $ok_message = $_[1];
2551         goto rerun;
2552         }
2553 else {
2554         # Use the standard error message display
2555         &write_data("HTTP/1.0 $_[0] $_[1]\r\n");
2556         &write_data("Server: $config{server}\r\n");
2557         &write_data("Date: $datestr\r\n");
2558         &write_data("Content-type: text/html; Charset=iso-8859-1\r\n");
2559         &write_keep_alive(0);
2560         &write_data("\r\n");
2561         &reset_byte_count();
2562         &write_data("<h1>Error - $_[1]</h1>\n");
2563         if ($_[2]) {
2564                 &write_data("<pre>$_[2]</pre>\n");
2565                 }
2566         }
2567 &log_request($acpthost, $authuser, $reqline, $_[0], &byte_count())
2568         if ($reqline);
2569 &log_error($_[1], $_[2] ? " : $_[2]" : "");
2570 shutdown(SOCK, 1);
2571 exit if (!$_[3]);
2572 }
2573
2574 sub get_type
2575 {
2576 if ($_[0] =~ /\.([A-z0-9]+)$/) {
2577         $t = $mime{$1};
2578         if ($t ne "") {
2579                 return $t;
2580                 }
2581         }
2582 return "text/plain";
2583 }
2584
2585 # simplify_path(path, bogus)
2586 # Given a path, maybe containing stuff like ".." and "." convert it to a
2587 # clean, absolute form.
2588 sub simplify_path
2589 {
2590 local($dir, @bits, @fixedbits, $b);
2591 $dir = $_[0];
2592 $dir =~ s/\\/\//g;      # fix windows \ in path
2593 $dir =~ s/^\/+//g;
2594 $dir =~ s/\/+$//g;
2595 $dir =~ s/\0//g;        # remove null bytes
2596 @bits = split(/\/+/, $dir);
2597 @fixedbits = ();
2598 $_[1] = 0;
2599 foreach $b (@bits) {
2600         if ($b eq ".") {
2601                 # Do nothing..
2602                 }
2603         elsif ($b eq ".." || $b eq "...") {
2604                 # Remove last dir
2605                 if (scalar(@fixedbits) == 0) {
2606                         $_[1] = 1;
2607                         return "/";
2608                         }
2609                 pop(@fixedbits);
2610                 }
2611         else {
2612                 # Add dir to list
2613                 push(@fixedbits, $b);
2614                 }
2615         }
2616 return "/" . join('/', @fixedbits);
2617 }
2618
2619 # b64decode(string)
2620 # Converts a string from base64 format to normal
2621 sub b64decode
2622 {
2623     local($str) = $_[0];
2624     local($res);
2625     $str =~ tr|A-Za-z0-9+=/||cd;
2626     $str =~ s/=+$//;
2627     $str =~ tr|A-Za-z0-9+/| -_|;
2628     while ($str =~ /(.{1,60})/gs) {
2629         my $len = chr(32 + length($1)*3/4);
2630         $res .= unpack("u", $len . $1 );
2631     }
2632     return $res;
2633 }
2634
2635 # ip_match(remoteip, localip, [match]+)
2636 # Checks an IP address against a list of IPs, networks and networks/masks
2637 sub ip_match
2638 {
2639 local(@io, @mo, @ms, $i, $j, $hn, $needhn);
2640 @io = &check_ip6address($_[0]) ? split(/:/, $_[0])
2641                                : split(/\./, $_[0]);
2642 for($i=2; $i<@_; $i++) {
2643         $needhn++ if ($_[$i] =~ /^\*(\S+)$/);
2644         }
2645 if ($needhn && !defined($hn = $ip_match_cache{$_[0]})) {
2646         # Reverse-lookup hostname if any rules match based on it
2647         $hn = &to_hostname($_[0]);
2648         if (&check_ip6address($_[0])) {
2649                 $hn = "" if (&to_ip6address($hn) ne $_[0]);
2650                 }
2651         else {
2652                 $hn = "" if (&to_ipaddress($hn) ne $_[0]);
2653                 }
2654         $ip_match_cache{$_[0]} = $hn;
2655         }
2656 for($i=2; $i<@_; $i++) {
2657         local $mismatch = 0;
2658         if ($_[$i] =~ /^(\S+)\/(\d+)$/) {
2659                 # Convert CIDR to netmask format
2660                 $_[$i] = $1."/".&prefix_to_mask($2);
2661                 }
2662         if ($_[$i] =~ /^(\S+)\/(\S+)$/) {
2663                 # Compare with IPv4 network/mask
2664                 @mo = split(/\./, $1); @ms = split(/\./, $2);
2665                 for($j=0; $j<4; $j++) {
2666                         if ((int($io[$j]) & int($ms[$j])) != int($mo[$j])) {
2667                                 $mismatch = 1;
2668                                 }
2669                         }
2670                 }
2671         elsif ($_[$i] =~ /^\*(\S+)$/) {
2672                 # Compare with hostname regexp
2673                 $mismatch = 1 if ($hn !~ /$1$/);
2674                 }
2675         elsif ($_[$i] eq 'LOCAL' && &check_ipaddress($_[1])) {
2676                 # Compare with local IPv4 network
2677                 local @lo = split(/\./, $_[1]);
2678                 if ($lo[0] < 128) {
2679                         $mismatch = 1 if ($lo[0] != $io[0]);
2680                         }
2681                 elsif ($lo[0] < 192) {
2682                         $mismatch = 1 if ($lo[0] != $io[0] ||
2683                                           $lo[1] != $io[1]);
2684                         }
2685                 else {
2686                         $mismatch = 1 if ($lo[0] != $io[0] ||
2687                                           $lo[1] != $io[1] ||
2688                                           $lo[2] != $io[2]);
2689                         }
2690                 }
2691         elsif ($_[$i] eq 'LOCAL' && &check_ip6address($_[1])) {
2692                 # Compare with local IPv6 network, which is always first 4 words
2693                 local @lo = split(/:/, $_[1]);
2694                 for(my $i=0; $i<4; $i++) {
2695                         $mismatch = 1 if ($lo[$i] ne $io[$i]);
2696                         }
2697                 }
2698         elsif ($_[$i] =~ /^[0-9\.]+$/) {
2699                 # Compare with IPv4 address or network
2700                 @mo = split(/\./, $_[$i]);
2701                 while(@mo && !$mo[$#mo]) { pop(@mo); }
2702                 for($j=0; $j<@mo; $j++) {
2703                         if ($mo[$j] != $io[$j]) {
2704                                 $mismatch = 1;
2705                                 }
2706                         }
2707                 }
2708         elsif ($_[$i] =~ /^[a-f0-9:]+$/) {
2709                 # Compare with IPv6 address or network
2710                 @mo = split(/:/, $_[$i]);
2711                 while(@mo && !$mo[$#mo]) { pop(@mo); }
2712                 for($j=0; $j<@mo; $j++) {
2713                         if ($mo[$j] ne $io[$j]) {
2714                                 $mismatch = 1;
2715                                 }
2716                         }
2717                 }
2718         elsif ($_[$i] !~ /^[0-9\.]+$/) {
2719                 # Compare with hostname
2720                 $mismatch = 1 if ($_[0] ne &to_ipaddress($_[$i]));
2721                 }
2722         return 1 if (!$mismatch);
2723         }
2724 return 0;
2725 }
2726
2727 # users_match(&uinfo, user, ...)
2728 # Returns 1 if a user is in a list of users and groups
2729 sub users_match
2730 {
2731 local $uinfo = shift(@_);
2732 local $u;
2733 local @ginfo = getgrgid($uinfo->[3]);
2734 foreach $u (@_) {
2735         if ($u =~ /^\@(\S+)$/) {
2736                 return 1 if (&is_group_member($uinfo, $1));
2737                 }
2738         elsif ($u =~ /^(\d*)-(\d*)$/ && ($1 || $2)) {
2739                 return (!$1 || $uinfo[2] >= $1) &&
2740                        (!$2 || $uinfo[2] <= $2);
2741                 }
2742         else {
2743                 return 1 if ($u eq $uinfo->[0]);
2744                 }
2745         }
2746 return 0;
2747 }
2748
2749 # restart_miniserv()
2750 # Called when a SIGHUP is received to restart the web server. This is done
2751 # by exec()ing perl with the same command line as was originally used
2752 sub restart_miniserv
2753 {
2754 print STDERR "restarting miniserv\n";
2755 &log_error("Restarting");
2756 close(SOCK);
2757 &close_all_sockets();
2758 &close_all_pipes();
2759 dbmclose(%sessiondb);
2760 kill('KILL', $logclearer) if ($logclearer);
2761 kill('KILL', $extauth) if ($extauth);
2762 exec($perl_path, $miniserv_path, @miniserv_argv);
2763 die "Failed to restart miniserv with $perl_path $miniserv_path";
2764 }
2765
2766 sub trigger_restart
2767 {
2768 $need_restart = 1;
2769 }
2770
2771 sub trigger_reload
2772 {
2773 $need_reload = 1;
2774 }
2775
2776 # to_ipaddress(address, ...)
2777 sub to_ipaddress
2778 {
2779 local (@rv, $i);
2780 foreach $i (@_) {
2781         if ($i =~ /(\S+)\/(\S+)/ || $i =~ /^\*\S+$/ ||
2782             $i eq 'LOCAL' || $i =~ /^[0-9\.]+$/ || $i =~ /^[a-f0-9:]+$/) {
2783                 # A pattern or IP, not a hostname, so don't change
2784                 push(@rv, $i);
2785                 }
2786         else {
2787                 # Lookup IP address
2788                 push(@rv, join('.', unpack("CCCC", inet_aton($i))));
2789                 }
2790         }
2791 return wantarray ? @rv : $rv[0];
2792 }
2793
2794 # to_ip6address(address, ...)
2795 sub to_ip6address
2796 {
2797 local (@rv, $i);
2798 foreach $i (@_) {
2799         if ($i =~ /(\S+)\/(\S+)/ || $i =~ /^\*\S+$/ ||
2800             $i eq 'LOCAL' || $i =~ /^[0-9\.]+$/ || $i =~ /^[a-f0-9:]+$/) {
2801                 # A pattern, not a hostname, so don't change
2802                 push(@rv, $i);
2803                 }
2804         else {
2805                 # Lookup IPv6 address
2806                 local ($inaddr, $addr);
2807                 (undef, undef, undef, $inaddr) =
2808                     getaddrinfo($i, undef, Socket6::AF_INET6(), SOCK_STREAM);
2809                 if ($inaddr) {
2810                         push(@rv, undef);
2811                         }
2812                 else {
2813                         (undef, $addr) = unpack_sockaddr_in6($inaddr);
2814                         push(@rv, inet_ntop(Socket6::AF_INET6(), $addr));
2815                         }
2816                 }
2817         }
2818 return wantarray ? @rv : $rv[0];
2819 }
2820
2821 # to_hostname(ipv4|ipv6-address)
2822 # Reverse-resolves an IPv4 or 6 address to a hostname
2823 sub to_hostname
2824 {
2825 local ($addr) = @_;
2826 if (&check_ip6address($_[0])) {
2827         return gethostbyaddr(inet_pton(Socket6::AF_INET6(), $addr),
2828                              Socket6::AF_INET6());
2829         }
2830 else {
2831         return gethostbyaddr(inet_aton($addr), AF_INET);
2832         }
2833 }
2834
2835 # read_line(no-wait, no-limit)
2836 # Reads one line from SOCK or SSL
2837 sub read_line
2838 {
2839 local ($nowait, $nolimit) = @_;
2840 local($idx, $more, $rv);
2841 while(($idx = index($main::read_buffer, "\n")) < 0) {
2842         if (length($main::read_buffer) > 10000 && !$nolimit) {
2843                 &http_error(414, "Request too long",
2844                     "Received excessive line <pre>$main::read_buffer</pre>");
2845                 }
2846
2847         # need to read more..
2848         &wait_for_data_error() if (!$nowait);
2849         if ($use_ssl) {
2850                 $more = Net::SSLeay::read($ssl_con);
2851                 }
2852         else {
2853                 my $bufsize = $config{'bufsize'} || 1024;
2854                 local $ok = sysread(SOCK, $more, $bufsize);
2855                 $more = undef if ($ok <= 0);
2856                 }
2857         if ($more eq '') {
2858                 # end of the data
2859                 $rv = $main::read_buffer;
2860                 undef($main::read_buffer);
2861                 return $rv;
2862                 }
2863         $main::read_buffer .= $more;
2864         }
2865 $rv = substr($main::read_buffer, 0, $idx+1);
2866 $main::read_buffer = substr($main::read_buffer, $idx+1);
2867 return $rv;
2868 }
2869
2870 # read_data(length)
2871 # Reads up to some amount of data from SOCK or the SSL connection
2872 sub read_data
2873 {
2874 local ($rv);
2875 if (length($main::read_buffer)) {
2876         if (length($main::read_buffer) > $_[0]) {
2877                 # Return the first part of the buffer
2878                 $rv = substr($main::read_buffer, 0, $_[0]);
2879                 $main::read_buffer = substr($main::read_buffer, $_[0]);
2880                 return $rv;
2881                 }
2882         else {
2883                 # Return the whole buffer
2884                 $rv = $main::read_buffer;
2885                 undef($main::read_buffer);
2886                 return $rv;
2887                 }
2888         }
2889 elsif ($use_ssl) {
2890         # Call SSL read function
2891         return Net::SSLeay::read($ssl_con, $_[0]);
2892         }
2893 else {
2894         # Just do a normal read
2895         local $buf;
2896         sysread(SOCK, $buf, $_[0]) || return undef;
2897         return $buf;
2898         }
2899 }
2900
2901 # sysread_line(fh)
2902 # Read a line from a file handle, using sysread to get a byte at a time
2903 sub sysread_line
2904 {
2905 local ($fh) = @_;
2906 local $line;
2907 while(1) {
2908         local ($buf, $got);
2909         $got = sysread($fh, $buf, 1);
2910         last if ($got <= 0);
2911         $line .= $buf;
2912         last if ($buf eq "\n");
2913         }
2914 return $line;
2915 }
2916
2917 # wait_for_data(secs)
2918 # Waits at most the given amount of time for some data on SOCK, returning
2919 # 0 if not found, 1 if some arrived.
2920 sub wait_for_data
2921 {
2922 local $rmask;
2923 vec($rmask, fileno(SOCK), 1) = 1;
2924 local $got = select($rmask, undef, undef, $_[0]);
2925 return $got == 0 ? 0 : 1;
2926 }
2927
2928 # wait_for_data_error()
2929 # Waits 60 seconds for data on SOCK, and fails if none arrives
2930 sub wait_for_data_error
2931 {
2932 local $got = &wait_for_data(60);
2933 if (!$got) {
2934         &http_error(400, "Timeout",
2935                     "Waited more than 60 seconds for request data");
2936         }
2937 }
2938
2939 # write_data(data, ...)
2940 # Writes a string to SOCK or the SSL connection
2941 sub write_data
2942 {
2943 local $str = join("", @_);
2944 if ($use_ssl) {
2945         Net::SSLeay::write($ssl_con, $str);
2946         }
2947 else {
2948         syswrite(SOCK, $str, length($str));
2949         }
2950 # Intentionally introduce a small delay to avoid problems where IE reports
2951 # the page as empty / DNS failed when it get a large response too quickly!
2952 select(undef, undef, undef, .01) if ($write_data_count%10 == 0);
2953 $write_data_count += length($str);
2954 }
2955
2956 # reset_byte_count()
2957 sub reset_byte_count { $write_data_count = 0; }
2958
2959 # byte_count()
2960 sub byte_count { return $write_data_count; }
2961
2962 # log_request(hostname, user, request, code, bytes)
2963 sub log_request
2964 {
2965 if ($config{'log'}) {
2966         local ($user, $ident, $headers);
2967         if ($config{'logident'}) {
2968                 # add support for rfc1413 identity checking here
2969                 }
2970         else { $ident = "-"; }
2971         $user = $_[1] ? $_[1] : "-";
2972         local $dstr = &make_datestr();
2973         if (fileno(MINISERVLOG)) {
2974                 seek(MINISERVLOG, 0, 2);
2975                 }
2976         else {
2977                 open(MINISERVLOG, ">>$config{'logfile'}");
2978                 chmod(0600, $config{'logfile'});
2979                 }
2980         if (defined($config{'logheaders'})) {
2981                 foreach $h (split(/\s+/, $config{'logheaders'})) {
2982                         $headers .= " $h=\"$header{$h}\"";
2983                         }
2984                 }
2985         elsif ($config{'logclf'}) {
2986                 $headers = " \"$header{'referer'}\" \"$header{'user-agent'}\"";
2987                 }
2988         else {
2989                 $headers = "";
2990                 }
2991         print MINISERVLOG "$_[0] $ident $user [$dstr] \"$_[2]\" ",
2992                           "$_[3] $_[4]$headers\n";
2993         close(MINISERVLOG);
2994         }
2995 }
2996
2997 # make_datestr()
2998 sub make_datestr
2999 {
3000 local @tm = localtime(time());
3001 return sprintf "%2.2d/%s/%4.4d:%2.2d:%2.2d:%2.2d %s",
3002                 $tm[3], $month[$tm[4]], $tm[5]+1900,
3003                 $tm[2], $tm[1], $tm[0], $timezone;
3004 }
3005
3006 # log_error(message)
3007 sub log_error
3008 {
3009 seek(STDERR, 0, 2);
3010 print STDERR "[",&make_datestr(),"] ",
3011         $acpthost ? ( "[",$acpthost,"] " ) : ( ),
3012         $page ? ( $page," : " ) : ( ),
3013         @_,"\n";
3014 }
3015
3016 # read_errors(handle)
3017 # Read and return all input from some filehandle
3018 sub read_errors
3019 {
3020 local($fh, $_, $rv);
3021 $fh = $_[0];
3022 while(<$fh>) { $rv .= $_; }
3023 return $rv;
3024 }
3025
3026 sub write_keep_alive
3027 {
3028 local $mode;
3029 if ($config{'nokeepalive'}) {
3030         # Keep alives have been disabled in config
3031         $mode = 0;
3032         }
3033 elsif (@childpids > $config{'maxconns'}*.8) {
3034         # Disable because nearing process limit
3035         $mode = 0;
3036         }
3037 elsif (@_) {
3038         # Keep alive specified by caller
3039         $mode = $_[0];
3040         }
3041 else {
3042         # Keep alive determined by browser
3043         $mode = $header{'connection'} =~ /keep-alive/i;
3044         }
3045 &write_data("Connection: ".($mode ? "Keep-Alive" : "close")."\r\n");
3046 return $mode;
3047 }
3048
3049 sub term_handler
3050 {
3051 kill('TERM', @childpids) if (@childpids);
3052 kill('KILL', $logclearer) if ($logclearer);
3053 kill('KILL', $extauth) if ($extauth);
3054 exit(1);
3055 }
3056
3057 sub http_date
3058 {
3059 local @tm = gmtime($_[0]);
3060 return sprintf "%s, %d %s %d %2.2d:%2.2d:%2.2d GMT",
3061                 $weekday[$tm[6]], $tm[3], $month[$tm[4]], $tm[5]+1900,
3062                 $tm[2], $tm[1], $tm[0];
3063 }
3064
3065 sub TIEHANDLE
3066 {
3067 my $i; bless \$i, shift;
3068 }
3069
3070 sub WRITE
3071 {
3072 $r = shift;
3073 my($buf,$len,$offset) = @_;
3074 &write_to_sock(substr($buf, $offset, $len));
3075 $miniserv::page_capture_out .= substr($buf, $offset, $len)
3076         if ($miniserv::page_capture);
3077 }
3078
3079 sub PRINT
3080 {
3081 $r = shift;
3082 $$r++;
3083 my $buf = join(defined($,) ? $, : "", @_);
3084 $buf .= $\ if defined($\);
3085 &write_to_sock($buf);
3086 $miniserv::page_capture_out .= $buf
3087         if ($miniserv::page_capture);
3088 }
3089
3090 sub PRINTF
3091 {
3092 shift;
3093 my $fmt = shift;
3094 my $buf = sprintf $fmt, @_;
3095 &write_to_sock($buf);
3096 $miniserv::page_capture_out .= $buf
3097         if ($miniserv::page_capture);
3098 }
3099
3100 # Send back already read data while we have it, then read from SOCK
3101 sub READ
3102 {
3103 my $r = shift;
3104 my $bufref = \$_[0];
3105 my $len = $_[1];
3106 my $offset = $_[2];
3107 if ($postpos < length($postinput)) {
3108         # Reading from already fetched array
3109         my $left = length($postinput) - $postpos;
3110         my $canread = $len > $left ? $left : $len;
3111         substr($$bufref, $offset, $canread) =
3112                 substr($postinput, $postpos, $canread);
3113         $postpos += $canread;
3114         return $canread;
3115         }
3116 else {
3117         # Read from network socket
3118         local $data = &read_data($len);
3119         if ($data eq '' && $len) {
3120                 # End of socket
3121                 print STDERR "finished reading - shutting down socket\n";
3122                 shutdown(SOCK, 0);
3123                 }
3124         substr($$bufref, $offset, length($data)) = $data;
3125         return length($data);
3126         }
3127 }
3128
3129 sub OPEN
3130 {
3131 #print STDERR "open() called - should never happen!\n";
3132 }
3133
3134 # Read a line of input
3135 sub READLINE
3136 {
3137 my $r = shift;
3138 if ($postpos < length($postinput) &&
3139     ($idx = index($postinput, "\n", $postpos)) >= 0) {
3140         # A line exists in the memory buffer .. use it
3141         my $line = substr($postinput, $postpos, $idx-$postpos+1);
3142         $postpos = $idx+1;
3143         return $line;
3144         }
3145 else {
3146         # Need to read from the socket
3147         my $line;
3148         if ($postpos < length($postinput)) {
3149                 # Start with in-memory data
3150                 $line = substr($postinput, $postpos);
3151                 $postpos = length($postinput);
3152                 }
3153         my $nl = &read_line(0, 1);
3154         if ($nl eq '') {
3155                 # End of socket
3156                 print STDERR "finished reading - shutting down socket\n";
3157                 shutdown(SOCK, 0);
3158                 }
3159         $line .= $nl if (defined($nl));
3160         return $line;
3161         }
3162 }
3163
3164 # Read one character of input
3165 sub GETC
3166 {
3167 my $r = shift;
3168 my $buf;
3169 my $got = READ($r, \$buf, 1, 0);
3170 return $got > 0 ? $buf : undef;
3171 }
3172
3173 sub FILENO
3174 {
3175 return fileno(SOCK);
3176 }
3177
3178 sub CLOSE { }
3179
3180 sub DESTROY { }
3181
3182 # write_to_sock(data, ...)
3183 sub write_to_sock
3184 {
3185 local $d;
3186 foreach $d (@_) {
3187         if ($doneheaders || $miniserv::nph_script) {
3188                 &write_data($d);
3189                 }
3190         else {
3191                 $headers .= $d;
3192                 while(!$doneheaders && $headers =~ s/^([^\r\n]*)(\r)?\n//) {
3193                         if ($1 =~ /^(\S+):\s+(.*)$/) {
3194                                 $cgiheader{lc($1)} = $2;
3195                                 push(@cgiheader, [ $1, $2 ]);
3196                                 }
3197                         elsif ($1 !~ /\S/) {
3198                                 $doneheaders++;
3199                                 }
3200                         else {
3201                                 &http_error(500, "Bad Header");
3202                                 }
3203                         }
3204                 if ($doneheaders) {
3205                         if ($cgiheader{"location"}) {
3206                                 &write_data(
3207                                         "HTTP/1.0 302 Moved Temporarily\r\n");
3208                                 &write_data("Date: $datestr\r\n");
3209                                 &write_data("Server: $config{server}\r\n");
3210                                 &write_keep_alive(0);
3211                                 }
3212                         elsif ($cgiheader{"content-type"} eq "") {
3213                                 &http_error(500, "Missing Content-Type Header");
3214                                 }
3215                         else {
3216                                 &write_data("HTTP/1.0 $ok_code $ok_message\r\n");
3217                                 &write_data("Date: $datestr\r\n");
3218                                 &write_data("Server: $config{server}\r\n");
3219                                 &write_keep_alive(0);
3220                                 }
3221                         foreach $h (@cgiheader) {
3222                                 &write_data("$h->[0]: $h->[1]\r\n");
3223                                 }
3224                         &write_data("\r\n");
3225                         &reset_byte_count();
3226                         &write_data($headers);
3227                         }
3228                 }
3229         }
3230 }
3231
3232 sub verify_client
3233 {
3234 local $cert = Net::SSLeay::X509_STORE_CTX_get_current_cert($_[1]);
3235 if ($cert) {
3236         local $errnum = Net::SSLeay::X509_STORE_CTX_get_error($_[1]);
3237         $verified_client = 1 if (!$errnum);
3238         }
3239 return 1;
3240 }
3241
3242 sub END
3243 {
3244 if ($doing_cgi_eval && $$ == $main_process_id) {
3245         # A CGI program called exit! This is a horrible hack to
3246         # finish up before really exiting
3247         shutdown(SOCK, 1);
3248         close(SOCK);
3249         close($PASSINw); close($PASSOUTw);
3250         &log_request($acpthost, $authuser, $reqline,
3251                      $cgiheader{"location"} ? "302" : $ok_code, &byte_count());
3252         }
3253 }
3254
3255 # urlize
3256 # Convert a string to a form ok for putting in a URL
3257 sub urlize {
3258   local($tmp, $tmp2, $c);
3259   $tmp = $_[0];
3260   $tmp2 = "";
3261   while(($c = chop($tmp)) ne "") {
3262         if ($c !~ /[A-z0-9]/) {
3263                 $c = sprintf("%%%2.2X", ord($c));
3264                 }
3265         $tmp2 = $c . $tmp2;
3266         }
3267   return $tmp2;
3268 }
3269
3270 # validate_user(username, password, host, remote-ip, webmin-port)
3271 # Checks if some username and password are valid. Returns the modified username,
3272 # the expired / temp pass flag, and the non-existence flag
3273 sub validate_user
3274 {
3275 local ($user, $pass, $host, $actpip, $port) = @_;
3276 return ( ) if (!$user);
3277 print DEBUG "validate_user: user=$user pass=$pass host=$host\n";
3278 local ($canuser, $canmode, $notexist, $webminuser, $sudo) =
3279         &can_user_login($user, undef, $host);
3280 print DEBUG "validate_user: canuser=$canuser canmode=$canmode notexist=$notexist webminuser=$webminuser sudo=$sudo\n";
3281 if ($notexist) {
3282         # User doesn't even exist, so go no further
3283         return ( undef, 0, 1 );
3284         }
3285 elsif ($canmode == 0) {
3286         # User does exist but cannot login
3287         return ( $canuser, 0, 0 );
3288         }
3289 elsif ($canmode == 1) {
3290         # Attempt Webmin authentication
3291         my $uinfo = &get_user_details($webminuser);
3292         if ($uinfo &&
3293             &password_crypt($pass, $uinfo->{'pass'}) eq $uinfo->{'pass'}) {
3294                 # Password is valid .. but check for expiry
3295                 local $lc = $uinfo->{'lastchanges'};
3296                 print DEBUG "validate_user: Password is valid lc=$lc pass_maxdays=$config{'pass_maxdays'}\n";
3297                 if ($config{'pass_maxdays'} && $lc && !$uinfo->{'nochange'}) {
3298                         local $daysold = (time() - $lc)/(24*60*60);
3299                         print DEBUG "maxdays=$config{'pass_maxdays'} daysold=$daysold temppass=$uinfo->{'temppass'}\n";
3300                         if ($config{'pass_lockdays'} &&
3301                             $daysold > $config{'pass_lockdays'}) {
3302                                 # So old that the account is locked
3303                                 return ( undef, 0, 0 );
3304                                 }
3305                         elsif ($daysold > $config{'pass_maxdays'}) {
3306                                 # Password has expired
3307                                 return ( $user, 1, 0 );
3308                                 }
3309                         }
3310                 if ($uinfo->{'temppass'}) {
3311                         # Temporary password - force change now
3312                         return ( $user, 2, 0 );
3313                         }
3314                 return ( $user, 0, 0 );
3315                 }
3316         elsif (!$uinfo) {
3317                 print DEBUG "validate_user: User $webminuser not found\n";
3318                 return ( undef, 0, 0 );
3319                 }
3320         else {
3321                 print DEBUG "validate_user: User $webminuser password mismatch $pass != $uinfo->{'pass'}\n";
3322                 return ( undef, 0, 0 );
3323                 }
3324         }
3325 elsif ($canmode == 2 || $canmode == 3) {
3326         # Attempt PAM or passwd file authentication
3327         local $val = &validate_unix_user($canuser, $pass, $acptip, $port);
3328         print DEBUG "validate_user: unix val=$val\n";
3329         if ($val && $sudo) {
3330                 # Need to check if this Unix user can sudo
3331                 if (!&check_sudo_permissions($canuser, $pass)) {
3332                         print DEBUG "validate_user: sudo failed\n";
3333                         $val = 0;
3334                         }
3335                 else {
3336                         print DEBUG "validate_user: sudo passed\n";
3337                         }
3338                 }
3339         return $val == 2 ? ( $canuser, 1, 0 ) :
3340                $val == 1 ? ( $canuser, 0, 0 ) : ( undef, 0, 0 );
3341         }
3342 elsif ($canmode == 4) {
3343         # Attempt external authentication
3344         return &validate_external_user($canuser, $pass) ?
3345                 ( $canuser, 0, 0 ) : ( undef, 0, 0 );
3346         }
3347 else {
3348         # Can't happen!
3349         return ( );
3350         }
3351 }
3352
3353 # validate_unix_user(user, password, remote-ip, local-port)
3354 # Returns 1 if a username and password are valid under unix, 0 if not,
3355 # or 2 if the account has expired.
3356 # Checks PAM if available, and falls back to reading the system password
3357 # file otherwise.
3358 sub validate_unix_user
3359 {
3360 if ($use_pam) {
3361         # Check with PAM
3362         $pam_username = $_[0];
3363         $pam_password = $_[1];
3364         eval "use Authen::PAM;";
3365         local $pamh = new Authen::PAM($config{'pam'}, $pam_username,
3366                                       \&pam_conv_func);
3367         if (ref($pamh)) {
3368                 $pamh->pam_set_item("PAM_RHOST", $_[2]) if ($_[2]);
3369                 $pamh->pam_set_item("PAM_TTY", $_[3]) if ($_[3]);
3370                 local $pam_ret = $pamh->pam_authenticate();
3371                 if ($pam_ret == PAM_SUCCESS()) {
3372                         # Logged in OK .. make sure password hasn't expired
3373                         local $acct_ret = $pamh->pam_acct_mgmt();
3374                         if ($acct_ret == PAM_SUCCESS()) {
3375                                 $pamh->pam_open_session();
3376                                 return 1;
3377                                 }
3378                         elsif ($acct_ret == PAM_NEW_AUTHTOK_REQD() ||
3379                                $acct_ret == PAM_ACCT_EXPIRED()) {
3380                                 return 2;
3381                                 }
3382                         else {
3383                                 print STDERR "Unknown pam_acct_mgmt return value : $acct_ret\n";
3384                                 return 0;
3385                                 }
3386                         }
3387                 return 0;
3388                 }
3389         }
3390 elsif ($config{'pam_only'}) {
3391         # Pam is not available, but configuration forces it's use!
3392         return 0;
3393         }
3394 elsif ($config{'passwd_file'}) {
3395         # Check in a password file
3396         local $rv = 0;
3397         open(FILE, $config{'passwd_file'});
3398         if ($config{'passwd_file'} eq '/etc/security/passwd') {
3399                 # Assume in AIX format
3400                 while(<FILE>) {
3401                         s/\s*$//;
3402                         if (/^\s*(\S+):/ && $1 eq $_[0]) {
3403                                 $_ = <FILE>;
3404                                 if (/^\s*password\s*=\s*(\S+)\s*$/) {
3405                                         $rv = $1 eq &password_crypt($_[1], $1) ?
3406                                                 1 : 0;
3407                                         }
3408                                 last;
3409                                 }
3410                         }
3411                 }
3412         else {
3413                 # Read the system password or shadow file
3414                 while(<FILE>) {
3415                         local @l = split(/:/, $_, -1);
3416                         local $u = $l[$config{'passwd_uindex'}];
3417                         local $p = $l[$config{'passwd_pindex'}];
3418                         if ($u eq $_[0]) {
3419                                 $rv = $p eq &password_crypt($_[1], $p) ? 1 : 0;
3420                                 if ($config{'passwd_cindex'} ne '' && $rv) {
3421                                         # Password may have expired!
3422                                         local $c = $l[$config{'passwd_cindex'}];
3423                                         local $m = $l[$config{'passwd_mindex'}];
3424                                         local $day = time()/(24*60*60);
3425                                         if ($c =~ /^\d+/ && $m =~ /^\d+/ &&
3426                                             $day - $c > $m) {
3427                                                 # Yep, it has ..
3428                                                 $rv = 2;
3429                                                 }
3430                                         }
3431                                 if ($p eq "" && $config{'passwd_blank'}) {
3432                                         # Force password change
3433                                         $rv = 2;
3434                                         }
3435                                 last;
3436                                 }
3437                         }
3438                 }
3439         close(FILE);
3440         return $rv if ($rv);
3441         }
3442
3443 # Fallback option - check password returned by getpw*
3444 local @uinfo = getpwnam($_[0]);
3445 if ($uinfo[1] ne '' && &password_crypt($_[1], $uinfo[1]) eq $uinfo[1]) {
3446         return 1;
3447         }
3448
3449 return 0;       # Totally failed
3450 }
3451
3452 # validate_external_user(user, pass)
3453 # Validate a user by passing the username and password to an external
3454 # squid-style authentication program
3455 sub validate_external_user
3456 {
3457 return 0 if (!$config{'extauth'});
3458 flock(EXTAUTH, 2);
3459 local $str = "$_[0] $_[1]\n";
3460 syswrite(EXTAUTH, $str, length($str));
3461 local $resp = <EXTAUTH>;
3462 flock(EXTAUTH, 8);
3463 return $resp =~ /^OK/i ? 1 : 0;
3464 }
3465
3466 # can_user_login(username, no-append, host)
3467 # Checks if a user can login or not.
3468 # First return value is the username.
3469 # Second is 0 if cannot login, 1 if using Webmin pass, 2 if PAM, 3 if password
3470 # file, 4 if external.
3471 # Third is 1 if the user does not exist at all, 0 if he does.
3472 # Fourth is the Webmin username whose permissions apply, based on unixauth.
3473 # Fifth is a flag indicating if a sudo check is needed.
3474 sub can_user_login
3475 {
3476 local $uinfo = &get_user_details($_[0]);
3477 if (!$uinfo) {
3478         # See if this user exists in Unix and can be validated by the same
3479         # method as the unixauth webmin user
3480         local $realuser = $unixauth{$_[0]};
3481         local @uinfo;
3482         local $sudo = 0;
3483         local $pamany = 0;
3484         eval { @uinfo = getpwnam($_[0]); };     # may fail on windows
3485         if (!$realuser && @uinfo) {
3486                 # No unixauth entry for the username .. try his groups
3487                 foreach my $ua (keys %unixauth) {
3488                         if ($ua =~ /^\@(.*)$/) {
3489                                 if (&is_group_member(\@uinfo, $1)) {
3490                                         $realuser = $unixauth{$ua};
3491                                         last;
3492                                         }
3493                                 }
3494                         }
3495                 }
3496         if (!$realuser && @uinfo) {
3497                 # Fall back to unix auth for all Unix users
3498                 $realuser = $unixauth{"*"};
3499                 }
3500         if (!$realuser && $use_sudo && @uinfo) {
3501                 # Allow login effectively as root, if sudo permits it
3502                 $sudo = 1;
3503                 $realuser = "root";
3504                 }
3505         if (!$realuser && !@uinfo && $config{'pamany'}) {
3506                 # If the user completely doesn't exist, we can still allow
3507                 # him to authenticate via PAM
3508                 $realuser = $config{'pamany'};
3509                 $pamany = 1;
3510                 }
3511         if (!$realuser) {
3512                 # For Usermin, always fall back to unix auth for any user,
3513                 # so that later checks with domain added / removed are done.
3514                 $realuser = $unixauth{"*"};
3515                 }
3516         return (undef, 0, 1, undef) if (!$realuser);
3517         local $uinfo = &get_user_details($realuser);
3518         return (undef, 0, 1, undef) if (!$uinfo);
3519         local $up = $uinfo->{'pass'};
3520
3521         # Work out possible domain names from the hostname
3522         local @doms = ( $_[2] );
3523         if ($_[2] =~ /^([^\.]+)\.(\S+)$/) {
3524                 push(@doms, $2);
3525                 }
3526
3527         if ($config{'user_mapping'} && !%user_mapping) {
3528                 # Read the user mapping file
3529                 %user_mapping = ();
3530                 open(MAPPING, $config{'user_mapping'});
3531                 while(<MAPPING>) {
3532                         s/\r|\n//g;
3533                         s/#.*$//;
3534                         if (/^(\S+)\s+(\S+)/) {
3535                                 if ($config{'user_mapping_reverse'}) {
3536                                         $user_mapping{$1} = $2;
3537                                         }
3538                                 else {
3539                                         $user_mapping{$2} = $1;
3540                                         }
3541                                 }
3542                         }
3543                 close(MAPPING);
3544                 }
3545
3546         # Check the user mapping file to see if there is an entry for the
3547         # user login in which specifies a new effective user
3548         local $um;
3549         foreach my $d (@doms) {
3550                 $um ||= $user_mapping{"$_[0]\@$d"};
3551                 }
3552         $um ||= $user_mapping{$_[0]};
3553         if (defined($um) && ($_[1]&4) == 0) {
3554                 # A mapping exists - use it!
3555                 return &can_user_login($um, $_[1]+4, $_[2]);
3556                 }
3557
3558         # Check if a user with the entered login and the domains appended
3559         # or prepended exists, and if so take it to be the effective user
3560         if (!@uinfo && $config{'domainuser'}) {
3561                 # Try again with name.domain and name.firstpart
3562                 local @firsts = map { /^([^\.]+)/; $1 } @doms;
3563                 if (($_[1]&1) == 0) {
3564                         local ($a, $p);
3565                         foreach $a (@firsts, @doms) {
3566                                 foreach $p ("$_[0].${a}", "$_[0]-${a}",
3567                                             "${a}.$_[0]", "${a}-$_[0]",
3568                                             "$_[0]_${a}", "${a}_$_[0]") {
3569                                         local @vu = &can_user_login(
3570                                                         $p, $_[1]+1, $_[2]);
3571                                         return @vu if ($vu[1]);
3572                                         }
3573                                 }
3574                         }
3575                 }
3576
3577         # Check if the user entered a domain at the end of his username when
3578         # he really shouldn't have, and if so try without it
3579         if (!@uinfo && $config{'domainstrip'} &&
3580             $_[0] =~ /^(\S+)\@(\S+)$/ && ($_[1]&2) == 0) {
3581                 local ($stripped, $dom) = ($1, $2);
3582                 local @vu = &can_user_login($stripped, $_[1] + 2, $_[2]);
3583                 return @vu if ($vu[1]);
3584                 local @vu = &can_user_login($stripped, $_[1] + 2, $dom);
3585                 return @vu if ($vu[1]);
3586                 }
3587
3588         return ( undef, 0, 1, undef ) if (!@uinfo && !$pamany);
3589
3590         if (@uinfo) {
3591                 if (scalar(@allowusers)) {
3592                         # Only allow people on the allow list
3593                         return ( undef, 0, 0, undef )
3594                                 if (!&users_match(\@uinfo, @allowusers));
3595                         }
3596                 elsif (scalar(@denyusers)) {
3597                         # Disallow people on the deny list
3598                         return ( undef, 0, 0, undef )
3599                                 if (&users_match(\@uinfo, @denyusers));
3600                         }
3601                 if ($config{'shells_deny'}) {
3602                         local $found = 0;
3603                         open(SHELLS, $config{'shells_deny'});
3604                         while(<SHELLS>) {
3605                                 s/\r|\n//g;
3606                                 s/#.*$//;
3607                                 $found++ if ($_ eq $uinfo[8]);
3608                                 }
3609                         close(SHELLS);
3610                         return ( undef, 0, 0, undef ) if (!$found);
3611                         }
3612                 }
3613
3614         if ($up eq 'x') {
3615                 # PAM or passwd file authentication
3616                 print DEBUG "can_user_login: Validate with PAM\n";
3617                 return ( $_[0], $use_pam ? 2 : 3, 0, $realuser, $sudo );
3618                 }
3619         elsif ($up eq 'e') {
3620                 # External authentication
3621                 print DEBUG "can_user_login: Validate externally\n";
3622                 return ( $_[0], 4, 0, $realuser, $sudo );
3623                 }
3624         else {
3625                 # Fixed Webmin password
3626                 print DEBUG "can_user_login: Validate by Webmin\n";
3627                 return ( $_[0], 1, 0, $realuser, $sudo );
3628                 }
3629         }
3630 elsif ($uinfo->{'pass'} eq 'x') {
3631         # Webmin user authenticated via PAM or password file
3632         return ( $_[0], $use_pam ? 2 : 3, 0, $_[0] );
3633         }
3634 elsif ($uinfo->{'pass'} eq 'e') {
3635         # Webmin user authenticated externally
3636         return ( $_[0], 4, 0, $_[0] );
3637         }
3638 else {
3639         # Normal Webmin user
3640         return ( $_[0], 1, 0, $_[0] );
3641         }
3642 }
3643
3644 # the PAM conversation function for interactive logins
3645 sub pam_conv_func
3646 {
3647 $pam_conv_func_called++;
3648 my @res;
3649 while ( @_ ) {
3650         my $code = shift;
3651         my $msg = shift;
3652         my $ans = "";
3653
3654         $ans = $pam_username if ($code == PAM_PROMPT_ECHO_ON() );
3655         $ans = $pam_password if ($code == PAM_PROMPT_ECHO_OFF() );
3656
3657         push @res, PAM_SUCCESS();
3658         push @res, $ans;
3659         }
3660 push @res, PAM_SUCCESS();
3661 return @res;
3662 }
3663
3664 sub urandom_timeout
3665 {
3666 close(RANDOM);
3667 }
3668
3669 # get_socket_ip(handle, ipv6-flag)
3670 # Returns the local IP address of some connection, as both a string and in
3671 # binary format
3672 sub get_socket_ip
3673 {
3674 local ($fh, $ipv6) = @_;
3675 local $sn = getsockname($fh);
3676 return undef if (!$sn);
3677 return &get_address_ip($sn, $ipv6);
3678 }
3679
3680 # get_address_ip(address, ipv6-flag)
3681 # Given a sockaddr object in binary format, return the binary address, text
3682 # address and port number
3683 sub get_address_ip
3684 {
3685 local ($sn, $ipv6) = @_;
3686 if ($ipv6) {
3687         local ($p, $b) = unpack_sockaddr_in6($sn);
3688         return ($b, inet_ntop(Socket6::AF_INET6(), $b), $p);
3689         }
3690 else {
3691         local ($p, $b) = unpack_sockaddr_in($sn);
3692         return ($b, inet_ntoa($b), $p);
3693         }
3694 }
3695
3696 # get_socket_name(handle, ipv6-flag)
3697 # Returns the local hostname or IP address of some connection
3698 sub get_socket_name
3699 {
3700 local ($fh, $ipv6) = @_;
3701 return $config{'host'} if ($config{'host'});
3702 local ($mybin, $myaddr) = &get_socket_ip($fh, $ipv6);
3703 if (!$get_socket_name_cache{$myaddr}) {
3704         local $myname;
3705         if (!$config{'no_resolv_myname'}) {
3706                 $myname = gethostbyaddr($mybin,
3707                                         $ipv6 ? Socket6::AF_INET6() : AF_INET);
3708                 }
3709         $myname ||= $myaddr;
3710         $get_socket_name_cache{$myaddr} = $myname;
3711         }
3712 return $get_socket_name_cache{$myaddr};
3713 }
3714
3715 # run_login_script(username, sid, remoteip, localip)
3716 sub run_login_script
3717 {
3718 if ($config{'login_script'}) {
3719         alarm(5);
3720         $SIG{'ALRM'} = sub { die "timeout" };
3721         eval {
3722                 system($config{'login_script'}.
3723                        " ".join(" ", map { quotemeta($_) || '""' } @_).
3724                        " >/dev/null 2>&1 </dev/null");
3725                 };
3726         alarm(0);
3727         }
3728 }
3729
3730 # run_logout_script(username, sid, remoteip, localip)
3731 sub run_logout_script
3732 {
3733 if ($config{'logout_script'}) {
3734         alarm(5);
3735         $SIG{'ALRM'} = sub { die "timeout" };
3736         eval {
3737                 system($config{'logout_script'}.
3738                        " ".join(" ", map { quotemeta($_) || '""' } @_).
3739                        " >/dev/null 2>&1 </dev/null");
3740                 };
3741         alarm(0);
3742         }
3743 }
3744
3745 # close_all_sockets()
3746 # Closes all the main listening sockets
3747 sub close_all_sockets
3748 {
3749 local $s;
3750 foreach $s (@socketfhs) {
3751         close($s);
3752         }
3753 }
3754
3755 # close_all_pipes()
3756 # Close all pipes for talking to sub-processes
3757 sub close_all_pipes
3758 {
3759 local $p;
3760 foreach $p (@passin) { close($p); }
3761 foreach $p (@passout) { close($p); }
3762 foreach $p (values %conversations) {
3763         if ($p->{'PAMOUTr'}) {
3764                 close($p->{'PAMOUTr'});
3765                 close($p->{'PAMINw'});
3766                 }
3767         }
3768 }
3769
3770 # check_user_ip(user)
3771 # Returns 1 if some user is allowed to login from the accepting IP, 0 if not
3772 sub check_user_ip
3773 {
3774 local ($username) = @_;
3775 local $uinfo = &get_user_details($username);
3776 return 1 if (!$uinfo);
3777 if ($uinfo->{'deny'} &&
3778     &ip_match($acptip, $localip, @{$uinfo->{'deny'}}) ||
3779     $uinfo->{'allow'} &&
3780     !&ip_match($acptip, $localip, @{$uinfo->{'allow'}})) {
3781         return 0;
3782         }
3783 return 1;
3784 }
3785
3786 # check_user_time(user)
3787 # Returns 1 if some user is allowed to login at the current date and time
3788 sub check_user_time
3789 {
3790 local ($username) = @_;
3791 local $uinfo = &get_user_details($username);
3792 return 1 if (!$uinfo || !$uinfo->{'allowdays'} && !$uinfo->{'allowhours'});
3793 local @tm = localtime(time());
3794 if ($uinfo->{'allowdays'}) {
3795         # Make sure day is allowed
3796         return 0 if (&indexof($tm[6], @{$uinfo->{'allowdays'}}) < 0);
3797         }
3798 if ($uinfo->{'allowhours'}) {
3799         # Make sure time is allowed
3800         local $m = $tm[2]*60+$tm[1];
3801         return 0 if ($m < $uinfo->{'allowhours'}->[0] ||
3802                      $m > $uinfo->{'allowhours'}->[1]);
3803         }
3804 return 1;
3805 }
3806
3807 # generate_random_id(password, [force-urandom])
3808 # Returns a random session ID number
3809 sub generate_random_id
3810 {
3811 local ($pass, $force_urandom) = @_;
3812 local $sid;
3813 if (!$bad_urandom) {
3814         # First try /dev/urandom, unless we have marked it as bad
3815         $SIG{ALRM} = "miniserv::urandom_timeout";
3816         alarm(5);
3817         if (open(RANDOM, "/dev/urandom")) {
3818                 my $tmpsid;
3819                 if (read(RANDOM, $tmpsid, 16) == 16) {
3820                         $sid = lc(unpack('h*',$tmpsid));
3821                         }
3822                 close(RANDOM);
3823                 }
3824         alarm(0);
3825         }
3826 if (!$sid && !$force_urandom) {
3827         $sid = time();
3828         local $mul = 1;
3829         foreach $c (split(//, &unix_crypt($pass, substr($$, -2)))) {
3830                 $sid += ord($c) * $mul;
3831                 $mul *= 3;
3832                 }
3833         }
3834 return $sid;
3835 }
3836
3837 # handle_login(username, ok, expired, not-exists, password, [no-test-cookie])
3838 # Called from handle_session to either mark a user as logged in, or not
3839 sub handle_login
3840 {
3841 local ($vu, $ok, $expired, $nonexist, $pass, $notest) = @_;
3842 $authuser = $vu if ($ok);
3843
3844 # check if the test cookie is set
3845 if ($header{'cookie'} !~ /testing=1/ && $vu &&
3846     !$config{'no_testing_cookie'} && !$notest) {
3847         &http_error(500, "No cookies",
3848            "Your browser does not support cookies, ".
3849            "which are required for this web server to ".
3850            "work in session authentication mode");
3851         }
3852
3853 # check with main process for delay
3854 if ($config{'passdelay'} && $vu) {
3855         print DEBUG "handle_login: requesting delay vu=$vu acptip=$acptip ok=$ok\n";
3856         print $PASSINw "delay $vu $acptip $ok\n";
3857         <$PASSOUTr> =~ /(\d+) (\d+)/;
3858         $blocked = $2;
3859         sleep($1);
3860         print DEBUG "handle_login: delay=$1 blocked=$2\n";
3861         }
3862
3863 if ($ok && (!$expired ||
3864             $config{'passwd_mode'} == 1)) {
3865         # Logged in OK! Tell the main process about
3866         # the new SID
3867         local $sid = &generate_random_id($pass);
3868         print DEBUG "handle_login: sid=$sid\n";
3869         print $PASSINw "new $sid $authuser $acptip\n";
3870
3871         # Run the post-login script, if any
3872         &run_login_script($authuser, $sid,
3873                           $acptip, $localip);
3874
3875         # Check for a redirect URL for the user
3876         local $rurl = &login_redirect($authuser, $pass, $host);
3877         print DEBUG "handle_login: redirect URL rurl=$rurl\n";
3878         if ($rurl) {
3879                 # Got one .. go to it
3880                 &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
3881                 &write_data("Date: $datestr\r\n");
3882                 &write_data("Server: $config{'server'}\r\n");
3883                 &write_data("Location: $rurl\r\n");
3884                 &write_keep_alive(0);
3885                 &write_data("\r\n");
3886                 &log_request($acpthost, $authuser, $reqline, 302, 0);
3887                 }
3888         else {
3889                 # Set cookie and redirect to originally requested page
3890                 &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
3891                 &write_data("Date: $datestr\r\n");
3892                 &write_data("Server: $config{'server'}\r\n");
3893                 local $ssl = $use_ssl || $config{'inetd_ssl'};
3894                 $portstr = $port == 80 && !$ssl ? "" :
3895                            $port == 443 && $ssl ? "" : ":$port";
3896                 $prot = $ssl ? "https" : "http";
3897                 local $sec = $ssl ? "; secure" : "";
3898                 #$sec .= "; httpOnly";
3899                 if ($in{'page'} !~ /^\/[A-Za-z0-9\/\.\-\_]+$/) {
3900                         # Make redirect URL safe
3901                         $in{'page'} = "/";
3902                         }
3903                 if ($in{'save'}) {
3904                         &write_data("Set-Cookie: $sidname=$sid; path=/; expires=\"Thu, 31-Dec-2037 00:00:00\"$sec\r\n");
3905                         }
3906                 else {
3907                         &write_data("Set-Cookie: $sidname=$sid; path=/$sec\r\n");
3908                         }
3909                 &write_data("Location: $prot://$host$portstr$in{'page'}\r\n");
3910                 &write_keep_alive(0);
3911                 &write_data("\r\n");
3912                 &log_request($acpthost, $authuser, $reqline, 302, 0);
3913                 syslog("info", "%s", "Successful login as $authuser from $acpthost") if ($use_syslog);
3914                 &write_login_utmp($authuser, $acpthost);
3915                 }
3916         return 0;
3917         }
3918 elsif ($ok && $expired &&
3919        ($config{'passwd_mode'} == 2 || $expired == 2)) {
3920         # Login was ok, but password has expired or was temporary. Need
3921         # to force display of password change form.
3922         $validated = 1;
3923         $authuser = undef;
3924         $querystring = "&user=".&urlize($vu).
3925                        "&pam=".$use_pam.
3926                        "&expired=".$expired;
3927         $method = "GET";
3928         $queryargs = "";
3929         $page = $config{'password_form'};
3930         $logged_code = 401;
3931         $miniserv_internal = 2;
3932         syslog("crit", "%s",
3933                 "Expired login as $vu ".
3934                 "from $acpthost") if ($use_syslog);
3935         }
3936 else {
3937         # Login failed, or password has expired. The login form will be
3938         # displayed again by later code
3939         $failed_user = $vu;
3940         $request_uri = $in{'page'};
3941         $already_session_id = undef;
3942         $method = "GET";
3943         $authuser = $baseauthuser = undef;
3944         syslog("crit", "%s",
3945                 ($nonexist ? "Non-existent" :
3946                  $expired ? "Expired" : "Invalid").
3947                 " login as $vu from $acpthost")
3948                 if ($use_syslog);
3949         }
3950 return undef;
3951 }
3952
3953 # write_login_utmp(user, host)
3954 # Record the login by some user in utmp
3955 sub write_login_utmp
3956 {
3957 if ($write_utmp) {
3958         # Write utmp record for login
3959         %utmp = ( 'ut_host' => $_[1],
3960                   'ut_time' => time(),
3961                   'ut_user' => $_[0],
3962                   'ut_type' => 7,       # user process
3963                   'ut_pid' => $main_process_id,
3964                   'ut_line' => $config{'pam'},
3965                   'ut_id' => '' );
3966         if (defined(&User::Utmp::putut)) {
3967                 User::Utmp::putut(\%utmp);
3968                 }
3969         else {
3970                 User::Utmp::pututline(\%utmp);
3971                 }
3972         }
3973 }
3974
3975 # write_logout_utmp(user, host)
3976 # Record the logout by some user in utmp
3977 sub write_logout_utmp
3978 {
3979 if ($write_utmp) {
3980         # Write utmp record for logout
3981         %utmp = ( 'ut_host' => $_[1],
3982                   'ut_time' => time(),
3983                   'ut_user' => $_[0],
3984                   'ut_type' => 8,       # dead process
3985                   'ut_pid' => $main_process_id,
3986                   'ut_line' => $config{'pam'},
3987                   'ut_id' => '' );
3988         if (defined(&User::Utmp::putut)) {
3989                 User::Utmp::putut(\%utmp);
3990                 }
3991         else {
3992                 User::Utmp::pututline(\%utmp);
3993                 }
3994         }
3995 }
3996
3997 # pam_conversation_process(username, write-pipe, read-pipe)
3998 # This function is called inside a sub-process to communicate with PAM. It sends
3999 # questions down one pipe, and reads responses from another
4000 sub pam_conversation_process
4001 {
4002 local ($user, $writer, $reader) = @_;
4003 $miniserv::pam_conversation_process_writer = $writer;
4004 $miniserv::pam_conversation_process_reader = $reader;
4005 eval "use Authen::PAM;";
4006 local $convh = new Authen::PAM(
4007         $config{'pam'}, $user, \&miniserv::pam_conversation_process_func);
4008 local $pam_ret = $convh->pam_authenticate();
4009 if ($pam_ret == PAM_SUCCESS()) {
4010         local $acct_ret = $convh->pam_acct_mgmt();
4011         if ($acct_ret == PAM_SUCCESS()) {
4012                 $convh->pam_open_session();
4013                 print $writer "x2 $user 1 0 0\n";
4014                 }
4015         elsif ($acct_ret == PAM_NEW_AUTHTOK_REQD() ||
4016                $acct_ret == PAM_ACCT_EXPIRED()) {
4017                 print $writer "x2 $user 1 1 0\n";
4018                 }
4019         else {
4020                 print $writer "x0 Unknown PAM account status $acct_ret\n";
4021                 }
4022         }
4023 else {
4024         print $writer "x2 $user 0 0 0\n";
4025         }
4026 exit(0);
4027 }
4028
4029 # pam_conversation_process_func(type, message, [type, message, ...])
4030 # A pipe that talks to both PAM and the master process
4031 sub pam_conversation_process_func
4032 {
4033 local @rv;
4034 select($miniserv::pam_conversation_process_writer); $| = 1; select(STDOUT);
4035 while(@_) {
4036         local ($type, $msg) = (shift, shift);
4037         $msg =~ s/\r|\n//g;
4038         local $ok = (print $miniserv::pam_conversation_process_writer "$type $msg\n");
4039         print $miniserv::pam_conversation_process_writer "\n";
4040         local $answer = <$miniserv::pam_conversation_process_reader>;
4041         $answer =~ s/\r|\n//g;
4042         push(@rv, PAM_SUCCESS(), $answer);
4043         }
4044 push(@rv, PAM_SUCCESS());
4045 return @rv;
4046 }
4047
4048 # allocate_pipes()
4049 # Returns 4 new pipe file handles
4050 sub allocate_pipes
4051 {
4052 local ($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw);
4053 local $p;
4054 local %taken = ( (map { $_, 1 } @passin),
4055                  (map { $_->{'PASSINr'} } values %conversations) );
4056 for($p=0; $taken{"PASSINr$p"}; $p++) { }
4057 $PASSINr = "PASSINr$p";
4058 $PASSINw = "PASSINw$p";
4059 $PASSOUTr = "PASSOUTr$p";
4060 $PASSOUTw = "PASSOUTw$p";
4061 pipe($PASSINr, $PASSINw);
4062 pipe($PASSOUTr, $PASSOUTw);
4063 select($PASSINw); $| = 1;
4064 select($PASSINr); $| = 1;
4065 select($PASSOUTw); $| = 1;
4066 select($PASSOUTw); $| = 1;
4067 select(STDOUT);
4068 return ($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw);
4069 }
4070
4071 # recv_pam_question(&conv, fd)
4072 # Reads one PAM question from the sub-process, and sends it to the HTTP handler.
4073 # Returns 0 if the conversation is over, 1 if not.
4074 sub recv_pam_question
4075 {
4076 local ($conf, $fh) = @_;
4077 local $pr = $conf->{'PAMOUTr'};
4078 select($pr); $| = 1; select(STDOUT);
4079 local $line = <$pr>;
4080 $line =~ s/\r|\n//g;
4081 if (!$line) {
4082         $line = <$pr>;
4083         $line =~ s/\r|\n//g;
4084         }
4085 $conf->{'last'} = time();
4086 if (!$line) {
4087         # Failed!
4088         print $fh "0 PAM conversation error\n";
4089         return 0;
4090         }
4091 else {
4092         local ($type, $msg) = split(/\s+/, $line, 2);
4093         if ($type =~ /^x(\d+)/) {
4094                 # Pass this status code through
4095                 print $fh "$1 $msg\n";
4096                 return $1 == 2 || $1 == 0 ? 0 : 1;
4097                 }
4098         elsif ($type == PAM_PROMPT_ECHO_ON()) {
4099                 # A normal question
4100                 print $fh "1 $msg\n";
4101                 return 1;
4102                 }
4103         elsif ($type == PAM_PROMPT_ECHO_OFF()) {
4104                 # A password
4105                 print $fh "3 $msg\n";
4106                 return 1;
4107                 }
4108         elsif ($type == PAM_ERROR_MSG() || $type == PAM_TEXT_INFO()) {
4109                 # A message that does not require a response
4110                 print $fh "4 $msg\n";
4111                 return 1;
4112                 }
4113         else {
4114                 # Unknown type!
4115                 print $fh "0 Unknown PAM message type $type\n";
4116                 return 0;
4117                 }
4118         }
4119 }
4120
4121 # send_pam_answer(&conv, answer)
4122 # Sends a response from the user to the PAM sub-process
4123 sub send_pam_answer
4124 {
4125 local ($conf, $answer) = @_;
4126 local $pw = $conf->{'PAMINw'};
4127 $conf->{'last'} = time();
4128 print $pw "$answer\n";
4129 }
4130
4131 # end_pam_conversation(&conv)
4132 # Clean up PAM conversation pipes and processes
4133 sub end_pam_conversation
4134 {
4135 local ($conv) = @_;
4136 kill('KILL', $conv->{'pid'}) if ($conv->{'pid'});
4137 if ($conv->{'PAMINr'}) {
4138         close($conv->{'PAMINr'});
4139         close($conv->{'PAMOUTr'});
4140         close($conv->{'PAMINw'});
4141         close($conv->{'PAMOUTw'});
4142         }
4143 delete($conversations{$conv->{'cid'}});
4144 }
4145
4146 # get_ipkeys(&miniserv)
4147 # Returns a list of IP address to key file mappings from a miniserv.conf entry
4148 sub get_ipkeys
4149 {
4150 local (@rv, $k);
4151 foreach $k (keys %{$_[0]}) {
4152         if ($k =~ /^ipkey_(\S+)/) {
4153                 local $ipkey = { 'ips' => [ split(/,/, $1) ],
4154                                  'key' => $_[0]->{$k},
4155                                  'index' => scalar(@rv) };
4156                 $ipkey->{'cert'} = $_[0]->{'ipcert_'.$1};
4157                 $ipkey->{'extracas'} = $_[0]->{'ipextracas_'.$1};
4158                 push(@rv, $ipkey);
4159                 }
4160         }
4161 return @rv;
4162 }
4163
4164 # create_ssl_context(keyfile, [certfile], [extracas])
4165 sub create_ssl_context
4166 {
4167 local ($keyfile, $certfile, $extracas) = @_;
4168 local $ssl_ctx;
4169 eval { $ssl_ctx = Net::SSLeay::new_x_ctx() };
4170 $ssl_ctx ||= Net::SSLeay::CTX_new();
4171 $ssl_ctx || die "Failed to create SSL context : $!";
4172 if ($client_certs) {
4173         Net::SSLeay::CTX_load_verify_locations(
4174                 $ssl_ctx, $config{'ca'}, "");
4175         Net::SSLeay::CTX_set_verify(
4176                 $ssl_ctx, &Net::SSLeay::VERIFY_PEER, \&verify_client);
4177         }
4178 if ($extracas && $extracas ne "none") {
4179         foreach my $p (split(/\s+/, $extracas)) {
4180                 Net::SSLeay::CTX_load_verify_locations(
4181                         $ssl_ctx, $p, "");
4182                 }
4183         }
4184
4185 Net::SSLeay::CTX_use_RSAPrivateKey_file(
4186         $ssl_ctx, $keyfile,
4187         &Net::SSLeay::FILETYPE_PEM) || die "Failed to open SSL key $keyfile";
4188 Net::SSLeay::CTX_use_certificate_file(
4189         $ssl_ctx, $certfile || $keyfile,
4190         &Net::SSLeay::FILETYPE_PEM) || die "Failed to open SSL cert $certfile";
4191
4192 return $ssl_ctx;
4193 }
4194
4195 # ssl_connection_for_ip(socket, ipv6-flag)
4196 # Returns a new SSL connection object for some socket, or undef if failed
4197 sub ssl_connection_for_ip
4198 {
4199 local ($sock, $ipv6) = @_;
4200 local $sn = getsockname($sock);
4201 if (!$sn) {
4202         print STDERR "Failed to get address for socket $sock\n";
4203         return undef;
4204         }
4205 local (undef, $myip, undef) = &get_address_ip($sn, $ipv6);
4206 local $ssl_ctx = $ssl_contexts{$myip} || $ssl_contexts{"*"};
4207 local $ssl_con = Net::SSLeay::new($ssl_ctx);
4208 if ($config{'ssl_cipher_list'}) {
4209         # Force use of ciphers
4210         eval "Net::SSLeay::set_cipher_list(
4211                         \$ssl_con, \$config{'ssl_cipher_list'})";
4212         if ($@) {
4213                 print STDERR "SSL cipher $config{'ssl_cipher_list'} failed : ",
4214                              "$@\n";
4215                 }
4216         else {
4217                 }
4218         }
4219 Net::SSLeay::set_fd($ssl_con, fileno($sock));
4220 if (!Net::SSLeay::accept($ssl_con)) {
4221         print STDERR "Failed to initialize SSL connection\n";
4222         return undef;
4223         }
4224 return $ssl_con;
4225 }
4226
4227 # login_redirect(username, password, host)
4228 # Calls the login redirect script (if configured), which may output a URL to
4229 # re-direct a user to after logging in.
4230 sub login_redirect
4231 {
4232 return undef if (!$config{'login_redirect'});
4233 local $quser = quotemeta($_[0]);
4234 local $qpass = quotemeta($_[1]);
4235 local $qhost = quotemeta($_[2]);
4236 local $url = `$config{'login_redirect'} $quser $qpass $qhost`;
4237 chop($url);
4238 return $url;
4239 }
4240
4241 # reload_config_file()
4242 # Re-read %config, and call post-config actions
4243 sub reload_config_file
4244 {
4245 &log_error("Reloading configuration");
4246 %config = &read_config_file($config_file);
4247 &update_vital_config();
4248 &read_users_file();
4249 &read_mime_types();
4250 &build_config_mappings();
4251 &read_webmin_crons();
4252 &precache_files();
4253 if ($config{'session'}) {
4254         dbmclose(%sessiondb);
4255         dbmopen(%sessiondb, $config{'sessiondb'}, 0700);
4256         }
4257 }
4258
4259 # read_config_file(file)
4260 # Reads the given config file, and returns a hash of values
4261 sub read_config_file
4262 {
4263 local %rv;
4264 open(CONF, $_[0]) || die "Failed to open config file $_[0] : $!";
4265 while(<CONF>) {
4266         s/\r|\n//g;
4267         if (/^#/ || !/\S/) { next; }
4268         /^([^=]+)=(.*)$/;
4269         $name = $1; $val = $2;
4270         $name =~ s/^\s+//g; $name =~ s/\s+$//g;
4271         $val =~ s/^\s+//g; $val =~ s/\s+$//g;
4272         $rv{$name} = $val;
4273         }
4274 close(CONF);
4275 return %rv;
4276 }
4277
4278 # update_vital_config()
4279 # Updates %config with defaults, and dies if something vital is missing
4280 sub update_vital_config
4281 {
4282 my %vital = ("port", 80,
4283           "root", "./",
4284           "server", "MiniServ/0.01",
4285           "index_docs", "index.html index.htm index.cgi index.php",
4286           "addtype_html", "text/html",
4287           "addtype_txt", "text/plain",
4288           "addtype_gif", "image/gif",
4289           "addtype_jpg", "image/jpeg",
4290           "addtype_jpeg", "image/jpeg",
4291           "realm", "MiniServ",
4292           "session_login", "/session_login.cgi",
4293           "pam_login", "/pam_login.cgi",
4294           "password_form", "/password_form.cgi",
4295           "password_change", "/password_change.cgi",
4296           "maxconns", 50,
4297           "pam", "webmin",
4298           "sidname", "sid",
4299           "unauth", "^/unauthenticated/ ^/robots.txt\$ ^[A-Za-z0-9\\-/_]+\\.jar\$ ^[A-Za-z0-9\\-/_]+\\.class\$ ^[A-Za-z0-9\\-/_]+\\.gif\$ ^[A-Za-z0-9\\-/_]+\\.png\$ ^[A-Za-z0-9\\-/_]+\\.conf\$ ^[A-Za-z0-9\\-/_]+\\.ico\$ ^/robots.txt\$",
4300           "max_post", 10000,
4301           "expires", 7*24*60*60,
4302           "pam_test_user", "root",
4303           "precache", "lang/en */lang/en",
4304          );
4305 foreach my $v (keys %vital) {
4306         if (!$config{$v}) {
4307                 if ($vital{$v} eq "") {
4308                         die "Missing config option $v";
4309                         }
4310                 $config{$v} = $vital{$v};
4311                 }
4312         }
4313 if (!$config{'sessiondb'}) {
4314         $config{'pidfile'} =~ /^(.*)\/[^\/]+$/;
4315         $config{'sessiondb'} = "$1/sessiondb";
4316         }
4317 if (!$config{'errorlog'}) {
4318         $config{'logfile'} =~ /^(.*)\/[^\/]+$/;
4319         $config{'errorlog'} = "$1/miniserv.error";
4320         }
4321 if (!$config{'tempbase'}) {
4322         $config{'pidfile'} =~ /^(.*)\/[^\/]+$/;
4323         $config{'tempbase'} = "$1/cgitemp";
4324         }
4325 if (!$config{'blockedfile'}) {
4326         $config{'pidfile'} =~ /^(.*)\/[^\/]+$/;
4327         $config{'blockedfile'} = "$1/blocked";
4328         }
4329 if (!$config{'webmincron_dir'}) {
4330         $config_file =~ /^(.*)\/[^\/]+$/;
4331         $config{'webmincron_dir'} = "$1/webmincron/crons";
4332         }
4333 if (!$config{'webmincron_last'}) {
4334         $config{'logfile'} =~ /^(.*)\/[^\/]+$/;
4335         $config{'webmincron_last'} = "$1/miniserv.lastcrons";
4336         }
4337 if (!$config{'webmincron_wrapper'}) {
4338         $config{'webmincron_wrapper'} = $config{'root'}.
4339                                         "/webmincron/webmincron.pl";
4340         }
4341 }
4342
4343 # read_users_file()
4344 # Fills the %users and %certs hashes from the users file in %config
4345 sub read_users_file
4346 {
4347 undef(%users);
4348 undef(%certs);
4349 undef(%allow);
4350 undef(%deny);
4351 undef(%allowdays);
4352 undef(%allowhours);
4353 undef(%lastchanges);
4354 undef(%nochange);
4355 undef(%temppass);
4356 if ($config{'userfile'}) {
4357         open(USERS, $config{'userfile'});
4358         while(<USERS>) {
4359                 s/\r|\n//g;
4360                 local @user = split(/:/, $_, -1);
4361                 $users{$user[0]} = $user[1];
4362                 $certs{$user[0]} = $user[3] if ($user[3]);
4363                 if ($user[4] =~ /^allow\s+(.*)/) {
4364                         $allow{$user[0]} = $config{'alwaysresolve'} ?
4365                                 [ split(/\s+/, $1) ] :
4366                                 [ &to_ipaddress(split(/\s+/, $1)) ];
4367                         }
4368                 elsif ($user[4] =~ /^deny\s+(.*)/) {
4369                         $deny{$user[0]} = $config{'alwaysresolve'} ?
4370                                 [ split(/\s+/, $1) ] :
4371                                 [ &to_ipaddress(split(/\s+/, $1)) ];
4372                         }
4373                 if ($user[5] =~ /days\s+(\S+)/) {
4374                         $allowdays{$user[0]} = [ split(/,/, $1) ];
4375                         }
4376                 if ($user[5] =~ /hours\s+(\d+)\.(\d+)-(\d+).(\d+)/) {
4377                         $allowhours{$user[0]} = [ $1*60+$2, $3*60+$4 ];
4378                         }
4379                 $lastchanges{$user[0]} = $user[6];
4380                 $nochange{$user[0]} = $user[9];
4381                 $temppass{$user[0]} = $user[10];
4382                 }
4383         close(USERS);
4384         }
4385
4386 # Test user DB, if configured
4387 if ($config{'userdb'}) {
4388         my $dbh = &connect_userdb($config{'userdb'});
4389         if (!ref($dbh)) {
4390                 print STDERR "Failed to open users database : $dbh\n"
4391                 }
4392         else {
4393                 &disconnect_userdb($config{'userdb'}, $dbh);
4394                 }
4395         }
4396 }
4397
4398 # get_user_details(username)
4399 # Returns a hash ref of user details, either from config files or the user DB
4400 sub get_user_details
4401 {
4402 my ($username) = @_;
4403 if (exists($users{$username})) {
4404         # In local files
4405         return { 'name' => $username,
4406                  'pass' => $users{$username},
4407                  'certs' => $certs{$username},
4408                  'allow' => $allow{$username},
4409                  'deny' => $deny{$username},
4410                  'allowdays' => $allowdays{$username},
4411                  'allowhours' => $allowhours{$username},
4412                  'lastchanges' => $lastchanges{$username},
4413                  'nochange' => $nochange{$username},
4414                  'temppass' => $temppass{$username},
4415                  'preroot' => $config{'preroot_'.$username},
4416                };
4417         }
4418 if ($config{'userdb'}) {
4419         # Try querying user database
4420         if (exists($get_user_details_cache{$username})) {
4421                 # Cached already
4422                 return $get_user_details_cache{$username};
4423                 }
4424         print DEBUG "get_user_details: Connecting to user database\n";
4425         my ($dbh, $proto, $prefix, $args) = &connect_userdb($config{'userdb'});
4426         my $user;
4427         my %attrs;
4428         if (!ref($dbh)) {
4429                 print DEBUG "get_user_details: Failed : $dbh\n";
4430                 print STDERR "Failed to connect to user database : $dbh\n";
4431                 }
4432         elsif ($proto eq "mysql" || $proto eq "postgresql") {
4433                 # Fetch user ID and password with SQL
4434                 print DEBUG "get_user_details: Looking for $username in SQL\n";
4435                 my $cmd = $dbh->prepare(
4436                         "select id,pass from webmin_user where name = ?");
4437                 if (!$cmd || !$cmd->execute($username)) {
4438                         print STDERR "Failed to lookup user : ",
4439                                      $dbh->errstr,"\n";
4440                         return undef;
4441                         }
4442                 my ($id, $pass) = $cmd->fetchrow();
4443                 $cmd->finish();
4444                 if (!$id) {
4445                         &disconnect_userdb($config{'userdb'}, $dbh);
4446                         $get_user_details_cache{$username} = undef;
4447                         print DEBUG "get_user_details: User not found\n";
4448                         return undef;
4449                         }
4450                 print DEBUG "get_user_details: id=$id pass=$pass\n";
4451
4452                 # Fetch attributes and add to user object
4453                 print DEBUG "get_user_details: finding user attributes\n";
4454                 my $cmd = $dbh->prepare(
4455                         "select attr,value from webmin_user_attr where id = ?");
4456                 if (!$cmd || !$cmd->execute($id)) {
4457                         print STDERR "Failed to lookup user attrs : ",
4458                                      $dbh->errstr,"\n";
4459                         return undef;
4460                         }
4461                 $user = { 'name' => $username,
4462                           'id' => $id,
4463                           'pass' => $pass,
4464                           'proto' => $proto };
4465                 while(my ($attr, $value) = $cmd->fetchrow()) {
4466                         $attrs{$attr} = $value;
4467                         }
4468                 $cmd->finish();
4469                 }
4470         elsif ($proto eq "ldap") {
4471                 # Fetch user DN with LDAP
4472                 print DEBUG "get_user_details: Looking for $username in LDAP\n";
4473                 my $rv = $dbh->search(
4474                         base => $prefix,
4475                         filter => '(&(cn='.$username.')(objectClass='.
4476                                   $args->{'userclass'}.'))',
4477                         scope => 'sub');
4478                 if (!$rv || $rv->code) {
4479                         print STDERR "Failed to lookup user : ",
4480                                      ($rv ? $rv->error : "Unknown error"),"\n";
4481                         return undef;
4482                         }
4483                 my ($u) = $rv->all_entries();
4484                 if (!$u) {
4485                         &disconnect_userdb($config{'userdb'}, $dbh);
4486                         $get_user_details_cache{$username} = undef;
4487                         print DEBUG "get_user_details: User not found\n";
4488                         return undef;
4489                         }
4490
4491                 # Extract attributes
4492                 my $pass = $u->get_value('webminPass');
4493                 $user = { 'name' => $username,
4494                           'id' => $u->dn(),
4495                           'pass' => $pass,
4496                           'proto' => $proto };
4497                 foreach my $la ($u->get_value('webminAttr')) {
4498                         my ($attr, $value) = split(/=/, $la, 2);
4499                         $attrs{$attr} = $value;
4500                         }
4501                 }
4502
4503         # Convert DB attributes into user object fields
4504         if ($user) {
4505                 print DEBUG "get_user_details: got ",scalar(keys %attrs),
4506                             " attributes\n";
4507                 $user->{'certs'} = $attrs{'cert'};
4508                 if ($attrs{'allow'}) {
4509                         $user->{'allow'} = $config{'alwaysresolve'} ?
4510                                 [ split(/\s+/, $attrs{'allow'}) ] :
4511                                 [ &to_ipaddress(split(/\s+/,$attrs{'allow'})) ];
4512                         }
4513                 if ($attrs{'deny'}) {
4514                         $user->{'deny'} = $config{'alwaysresolve'} ?
4515                                 [ split(/\s+/, $attrs{'deny'}) ] :
4516                                 [ &to_ipaddress(split(/\s+/,$attrs{'deny'})) ];
4517                         }
4518                 if ($attrs{'days'}) {
4519                         $user->{'allowdays'} = [ split(/,/, $attrs{'days'}) ];
4520                         }
4521                 if ($attrs{'hoursfrom'} && $attrs{'hoursto'}) {
4522                         my ($hf, $mf) = split(/\./, $attrs{'hoursfrom'});
4523                         my ($ht, $mt) = split(/\./, $attrs{'hoursto'});
4524                         $user->{'allowhours'} = [ $hf*60+$ht, $ht*60+$mt ];
4525                         }
4526                 $user->{'lastchanges'} = $attrs{'lastchange'};
4527                 $user->{'nochange'} = $attrs{'nochange'};
4528                 $user->{'temppass'} = $attrs{'temppass'};
4529                 $user->{'preroot'} = $attrs{'theme'};
4530                 }
4531         &disconnect_userdb($config{'userdb'}, $dbh);
4532         $get_user_details_cache{$user->{'name'}} = $user;
4533         return $user;
4534         }
4535 return undef;
4536 }
4537
4538 # find_user_by_cert(cert)
4539 # Returns a username looked up by certificate
4540 sub find_user_by_cert
4541 {
4542 my ($peername) = @_;
4543 my $peername2 = $peername;
4544 $peername2 =~ s/Email=/emailAddress=/ || $peername2 =~ s/emailAddress=/Email=/;
4545
4546 # First check users in local files
4547 foreach my $username (keys %certs) {
4548         if ($certs{$username} eq $peername ||
4549             $certs{$username} eq $peername2) {
4550                 return $username;
4551                 }
4552         }
4553
4554 # Check user DB
4555 if ($config{'userdb'}) {
4556         my ($dbh, $proto) = &connect_userdb($config{'userdb'});
4557         if (!ref($dbh)) {
4558                 return undef;
4559                 }
4560         elsif ($proto eq "mysql" || $proto eq "postgresql") {
4561                 # Query with SQL
4562                 my $cmd = $dbh->prepare("select webmin_user.name from webmin_user,webmin_user_attr where webmin_user.id = webmin_user_attr.id and webmin_user_attr.attr = 'cert' and webmin_user_attr.value = ?");
4563                 return undef if (!$cmd);
4564                 foreach my $p ($peername, $peername2) {
4565                         my $username;
4566                         if ($cmd->execute($p)) {
4567                                 ($username) = $cmd->fetchrow();
4568                                 }
4569                         $cmd->finish();
4570                         return $username if ($username);
4571                         }
4572                 }
4573         elsif ($proto eq "ldap") {
4574                 # Lookup in LDAP
4575                 my $rv = $dbh->search(
4576                         base => $prefix,
4577                         filter => '(objectClass='.
4578                                   $args->{'userclass'}.')',
4579                         scope => 'sub',
4580                         attrs => [ 'cn', 'webminAttr' ]);
4581                 if ($rv && !$rv->code) {
4582                         foreach my $u ($rv->all_entries) {
4583                                 my @attrs = $u->get_value('webminAttr');
4584                                 foreach my $la (@attrs) {
4585                                         my ($attr, $value) = split(/=/, $la, 2);
4586                                         if ($attr eq "cert" &&
4587                                             ($value eq $peername ||
4588                                              $value eq $peername2)) {
4589                                                 return $u->get_value('cn');
4590                                                 }
4591                                         }
4592                                 }
4593                         }
4594                 }
4595         }
4596 return undef;
4597 }
4598
4599 # connect_userdb(string)
4600 # Returns a handle for talking to a user database - may be a DBI or LDAP handle.
4601 # On failure returns an error message string. In an array context, returns the
4602 # protocol type too.
4603 sub connect_userdb
4604 {
4605 my ($str) = @_;
4606 my ($proto, $user, $pass, $host, $prefix, $args) = &split_userdb_string($str);
4607 if ($proto eq "mysql") {
4608         # Connect to MySQL with DBI
4609         my $drh = eval "use DBI; DBI->install_driver('mysql');";
4610         $drh || return $text{'sql_emysqldriver'};
4611         my ($host, $port) = split(/:/, $host);
4612         my $cstr = "database=$prefix;host=$host";
4613         $cstr .= ";port=$port" if ($port);
4614         print DEBUG "connect_userdb: Connecting to MySQL $cstr as $user\n";
4615         my $dbh = $drh->connect($cstr, $user, $pass, { });
4616         $dbh || return &text('sql_emysqlconnect', $drh->errstr);
4617         print DEBUG "connect_userdb: Connected OK\n";
4618         return wantarray ? ($dbh, $proto, $prefix, $args) : $dbh;
4619         }
4620 elsif ($proto eq "postgresql") {
4621         # Connect to PostgreSQL with DBI
4622         my $drh = eval "use DBI; DBI->install_driver('Pg');";
4623         $drh || return $text{'sql_epostgresqldriver'};
4624         my ($host, $port) = split(/:/, $host);
4625         my $cstr = "dbname=$prefix;host=$host";
4626         $cstr .= ";port=$port" if ($port);
4627         print DEBUG "connect_userdb: Connecting to PostgreSQL $cstr as $user\n";
4628         my $dbh = $drh->connect($cstr, $user, $pass);
4629         $dbh || return &text('sql_epostgresqlconnect', $drh->errstr);
4630         print DEBUG "connect_userdb: Connected OK\n";
4631         return wantarray ? ($dbh, $proto, $prefix, $args) : $dbh;
4632         }
4633 elsif ($proto eq "ldap") {
4634         # Connect with perl LDAP module
4635         eval "use Net::LDAP";
4636         $@ && return $text{'sql_eldapdriver'};
4637         my ($host, $port) = split(/:/, $host);
4638         my $scheme = $args->{'scheme'} || 'ldap';
4639         if (!$port) {
4640                 $port = $scheme eq 'ldaps' ? 636 : 389;
4641                 }
4642         my $ldap = Net::LDAP->new($host,
4643                                   port => $port,
4644                                   'scheme' => $scheme);
4645         $ldap || return &text('sql_eldapconnect', $host);
4646         my $mesg;
4647         if ($args->{'tls'}) {
4648                 # Switch to TLS mode
4649                 eval { $mesg = $ldap->start_tls(); };
4650                 if ($@ || !$mesg || $mesg->code) {
4651                         return &text('sql_eldaptls',
4652                             $@ ? $@ : $mesg ? $mesg->error : "Unknown error");
4653                         }
4654                 }
4655         # Login to the server
4656         if ($pass) {
4657                 $mesg = $ldap->bind(dn => $user, password => $pass);
4658                 }
4659         else {
4660                 $mesg = $ldap->bind(dn => $user, anonymous => 1);
4661                 }
4662         if (!$mesg || $mesg->code) {
4663                 return &text('sql_eldaplogin', $user,
4664                              $mesg ? $mesg->error : "Unknown error");
4665                 }
4666         return wantarray ? ($ldap, $proto, $prefix, $args) : $ldap;
4667         }
4668 else {
4669         return "Unknown protocol $proto";
4670         }
4671 }
4672
4673 # split_userdb_string(string)
4674 # Converts a string like mysql://user:pass@host/db into separate parts
4675 sub split_userdb_string
4676 {
4677 my ($str) = @_;
4678 if ($str =~ /^([a-z]+):\/\/([^:]*):([^\@]*)\@([a-z0-9\.\-\_]+)\/([^\?]+)(\?(.*))?$/) {
4679         my ($proto, $user, $pass, $host, $prefix, $argstr) =
4680                 ($1, $2, $3, $4, $5, $7);
4681         my %args = map { split(/=/, $_, 2) } split(/\&/, $argstr);
4682         return ($proto, $user, $pass, $host, $prefix, \%args);
4683         }
4684 return ( );
4685 }
4686
4687 # disconnect_userdb(string, &handle)
4688 # Closes a handle opened by connect_userdb
4689 sub disconnect_userdb
4690 {
4691 my ($str, $h) = @_;
4692 if ($str =~ /^(mysql|postgresql):/) {
4693         # DBI disconnnect
4694         $h->disconnect();
4695         }
4696 elsif ($str =~ /^ldap:/) {
4697         # LDAP disconnect
4698         $h->disconnect();
4699         }
4700 }
4701
4702 # read_mime_types()
4703 # Fills %mime with entries from file in %config and extra settings in %config
4704 sub read_mime_types
4705 {
4706 undef(%mime);
4707 if ($config{"mimetypes"} ne "") {
4708         open(MIME, $config{"mimetypes"});
4709         while(<MIME>) {
4710                 chop; s/#.*$//;
4711                 if (/^(\S+)\s+(.*)$/) {
4712                         my $type = $1;
4713                         my @exts = split(/\s+/, $2);
4714                         foreach my $ext (@exts) {
4715                                 $mime{$ext} = $type;
4716                                 }
4717                         }
4718                 }
4719         close(MIME);
4720         }
4721 foreach my $k (keys %config) {
4722         if ($k !~ /^addtype_(.*)$/) { next; }
4723         $mime{$1} = $config{$k};
4724         }
4725 }
4726
4727 # build_config_mappings()
4728 # Build the anonymous access list, IP access list, unauthenticated URLs list,
4729 # redirect mapping and allow and deny lists from %config
4730 sub build_config_mappings
4731 {
4732 # build anonymous access list
4733 undef(%anonymous);
4734 foreach my $a (split(/\s+/, $config{'anonymous'})) {
4735         if ($a =~ /^([^=]+)=(\S+)$/) {
4736                 $anonymous{$1} = $2;
4737                 }
4738         }
4739
4740 # build IP access list
4741 undef(%ipaccess);
4742 foreach my $a (split(/\s+/, $config{'ipaccess'})) {
4743         if ($a =~ /^([^=]+)=(\S+)$/) {
4744                 $ipaccess{$1} = $2;
4745                 }
4746         }
4747
4748 # build unauthenticated URLs list
4749 @unauth = split(/\s+/, $config{'unauth'});
4750
4751 # build redirect mapping
4752 undef(%redirect);
4753 foreach my $r (split(/\s+/, $config{'redirect'})) {
4754         if ($r =~ /^([^=]+)=(\S+)$/) {
4755                 $redirect{$1} = $2;
4756                 }
4757         }
4758
4759 # build prefixes to be stripped
4760 undef(@strip_prefix);
4761 foreach my $r (split(/\s+/, $config{'strip_prefix'})) {
4762         push(@strip_prefix, $r);
4763         }
4764
4765 # Init allow and deny lists
4766 @deny = split(/\s+/, $config{"deny"});
4767 @deny = &to_ipaddress(@deny) if (!$config{'alwaysresolve'});
4768 @allow = split(/\s+/, $config{"allow"});
4769 @allow = &to_ipaddress(@allow) if (!$config{'alwaysresolve'});
4770 undef(@allowusers);
4771 undef(@denyusers);
4772 if ($config{'allowusers'}) {
4773         @allowusers = split(/\s+/, $config{'allowusers'});
4774         }
4775 elsif ($config{'denyusers'}) {
4776         @denyusers = split(/\s+/, $config{'denyusers'});
4777         }
4778
4779 # Build list of unixauth mappings
4780 undef(%unixauth);
4781 foreach my $ua (split(/\s+/, $config{'unixauth'})) {
4782         if ($ua =~ /^(\S+)=(\S+)$/) {
4783                 $unixauth{$1} = $2;
4784                 }
4785         else {
4786                 $unixauth{"*"} = $ua;
4787                 }
4788         }
4789
4790 # Build list of non-session-auth pages
4791 undef(%sessiononly);
4792 foreach my $sp (split(/\s+/, $config{'sessiononly'})) {
4793         $sessiononly{$sp} = 1;
4794         }
4795
4796 # Build list of logout times
4797 undef(@logouttimes);
4798 foreach my $a (split(/\s+/, $config{'logouttimes'})) {
4799         if ($a =~ /^([^=]+)=(\S+)$/) {
4800                 push(@logouttimes, [ $1, $2 ]);
4801                 }
4802         }
4803 push(@logouttimes, [ undef, $config{'logouttime'} ]);
4804
4805 # Build list of DAV pathss
4806 undef(@davpaths);
4807 foreach my $d (split(/\s+/, $config{'davpaths'})) {
4808         push(@davpaths, $d);
4809         }
4810 @davusers = split(/\s+/, $config{'dav_users'});
4811
4812 # Mobile agent substrings and hostname prefixes
4813 @mobile_agents = split(/\t+/, $config{'mobile_agents'});
4814 @mobile_prefixes = split(/\s+/, $config{'mobile_prefixes'});
4815
4816 # Expires time list
4817 @expires_paths = ( );
4818 foreach my $pe (split(/\t+/, $config{'expires_paths'})) {
4819         my ($p, $e) = split(/=/, $pe);
4820         if ($p && $e ne '') {
4821                 push(@expires_paths, [ $p, $e ]);
4822                 }
4823         }
4824
4825 # Open debug log
4826 close(DEBUG);
4827 if ($config{'debug'}) {
4828         open(DEBUG, ">>$config{'debug'}");
4829         }
4830 else {
4831         open(DEBUG, ">/dev/null");
4832         }
4833
4834 # Reset cache of sudo checks
4835 undef(%sudocache);
4836 }
4837
4838 # is_group_member(&uinfo, groupname)
4839 # Returns 1 if some user is a primary or secondary member of a group
4840 sub is_group_member
4841 {
4842 local ($uinfo, $group) = @_;
4843 local @ginfo = getgrnam($group);
4844 return 0 if (!@ginfo);
4845 return 1 if ($ginfo[2] == $uinfo->[3]); # primary member
4846 foreach my $m (split(/\s+/, $ginfo[3])) {
4847         return 1 if ($m eq $uinfo->[0]);
4848         }
4849 return 0;
4850 }
4851
4852 # prefix_to_mask(prefix)
4853 # Converts a number like 24 to a mask like 255.255.255.0
4854 sub prefix_to_mask
4855 {
4856 return $_[0] >= 24 ? "255.255.255.".(256-(2 ** (32-$_[0]))) :
4857        $_[0] >= 16 ? "255.255.".(256-(2 ** (24-$_[0]))).".0" :
4858        $_[0] >= 8 ? "255.".(256-(2 ** (16-$_[0]))).".0.0" :
4859                      (256-(2 ** (8-$_[0]))).".0.0.0";
4860 }
4861
4862 # get_logout_time(user, session-id)
4863 # Given a username, returns the idle time before he will be logged out
4864 sub get_logout_time
4865 {
4866 local ($user, $sid) = @_;
4867 if (!defined($logout_time_cache{$user,$sid})) {
4868         local $time;
4869         foreach my $l (@logouttimes) {
4870                 if ($l->[0] =~ /^\@(.*)$/) {
4871                         # Check group membership
4872                         local @uinfo = getpwnam($user);
4873                         if (@uinfo && &is_group_member(\@uinfo, $1)) {
4874                                 $time = $l->[1];
4875                                 }
4876                         }
4877                 elsif ($l->[0] =~ /^\//) {
4878                         # Check file contents
4879                         open(FILE, $l->[0]);
4880                         while(<FILE>) {
4881                                 s/\r|\n//g;
4882                                 s/^\s*#.*$//;
4883                                 if ($user eq $_) {
4884                                         $time = $l->[1];
4885                                         last;
4886                                         }
4887                                 }
4888                         close(FILE);
4889                         }
4890                 elsif (!$l->[0]) {
4891                         # Always match
4892                         $time = $l->[1];
4893                         }
4894                 else {
4895                         # Check username
4896                         if ($l->[0] eq $user) {
4897                                 $time = $l->[1];
4898                                 }
4899                         }
4900                 last if (defined($time));
4901                 }
4902         $logout_time_cache{$user,$sid} = $time;
4903         }
4904 return $logout_time_cache{$user,$sid};
4905 }
4906
4907 # password_crypt(password, salt)
4908 # If the salt looks like MD5 and we have a library for it, perform MD5 hashing
4909 # of a password. Otherwise, do Unix crypt.
4910 sub password_crypt
4911 {
4912 local ($pass, $salt) = @_;
4913 if ($salt =~ /^\$1\$/ && $use_md5) {
4914         return &encrypt_md5($pass, $salt);
4915         }
4916 else {
4917         return &unix_crypt($pass, $salt);
4918         }
4919 }
4920
4921 # unix_crypt(password, salt)
4922 # Performs standard Unix hashing for a password
4923 sub unix_crypt
4924 {
4925 local ($pass, $salt) = @_;
4926 if ($use_perl_crypt) {
4927         return Crypt::UnixCrypt::crypt($pass, $salt);
4928         }
4929 else {
4930         return crypt($pass, $salt);
4931         }
4932 }
4933
4934 # handle_dav_request(davpath)
4935 # Pass a request on to the Net::DAV::Server module
4936 sub handle_dav_request
4937 {
4938 local ($path) = @_;
4939 eval "use Filesys::Virtual::Plain";
4940 eval "use Net::DAV::Server";
4941 eval "use HTTP::Request";
4942 eval "use HTTP::Headers";
4943
4944 if ($Net::DAV::Server::VERSION eq '1.28' && $config{'dav_nolock'}) {
4945         delete $Net::DAV::Server::implemented{lock};
4946         delete $Net::DAV::Server::implemented{unlock};
4947         }
4948
4949 # Read in request data
4950 if (!$posted_data) {
4951         local $clen = $header{"content-length"};
4952         while(length($posted_data) < $clen) {
4953                 $buf = &read_data($clen - length($posted_data));
4954                 if (!length($buf)) {
4955                         &http_error(500, "Failed to read POST request");
4956                         }
4957                 $posted_data .= $buf;
4958                 }
4959         }
4960
4961 # For subsequent logging
4962 open(MINISERVLOG, ">>$config{'logfile'}");
4963
4964 # Switch to user
4965 local $root;
4966 local @u = getpwnam($authuser);
4967 if ($config{'dav_remoteuser'} && !$< && $validated) {
4968         if (@u) {
4969                 if ($u[2] != 0) {
4970                         $( = $u[3]; $) = "$u[3] $u[3]";
4971                         ($>, $<) = ($u[2], $u[2]);
4972                         }
4973                 if ($config{'dav_root'} eq '*') {
4974                         $root = $u[7];
4975                         }
4976                 }
4977         else {
4978                 &http_error(500, "Unix user $authuser does not exist");
4979                 return 0;
4980                 }
4981         }
4982 $root ||= $config{'dav_root'};
4983 $root ||= "/";
4984
4985 # Check if this user can use DAV
4986 if (@davusers) {
4987         &users_match(\@u, @davusers) ||
4988                 &http_error(500, "You are not allowed to access DAV");
4989         }
4990
4991 # Create DAV server
4992 my $filesys = Filesys::Virtual::Plain->new({root_path => $root});
4993 my $webdav = Net::DAV::Server->new();
4994 $webdav->filesys($filesys);
4995
4996 # Make up a request object, and feed to DAV
4997 local $ho = HTTP::Headers->new;
4998 foreach my $h (keys %header) {
4999         next if (lc($h) eq "connection");
5000         $ho->header($h => $header{$h});
5001         }
5002 if ($path ne "/") {
5003         $request_uri =~ s/^\Q$path\E//;
5004         $request_uri = "/" if ($request_uri eq "");
5005         }
5006 my $request = HTTP::Request->new($method, $request_uri, $ho,
5007                                  $posted_data);
5008 if ($config{'dav_debug'}) {
5009         print STDERR "DAV request :\n";
5010         print STDERR "---------------------------------------------\n";
5011         print STDERR $request->as_string();
5012         print STDERR "---------------------------------------------\n";
5013         }
5014 my $response = $webdav->run($request);
5015
5016 # Send back the reply
5017 &write_data("HTTP/1.1 ",$response->code()," ",$response->message(),"\r\n");
5018 local $content = $response->content();
5019 if ($path ne "/") {
5020         $content =~ s|href>/(.+)<|href>$path/$1<|g;
5021         $content =~ s|href>/<|href>$path<|g;
5022         }
5023 foreach my $h ($response->header_field_names) {
5024         next if (lc($h) eq "connection" || lc($h) eq "content-length");
5025         &write_data("$h: ",$response->header($h),"\r\n");
5026         }
5027 &write_data("Content-length: ",length($content),"\r\n");
5028 local $rv = &write_keep_alive(0);
5029 &write_data("\r\n");
5030 &write_data($content);
5031
5032 if ($config{'dav_debug'}) {
5033         print STDERR "DAV reply :\n";
5034         print STDERR "---------------------------------------------\n";
5035         print STDERR "HTTP/1.1 ",$response->code()," ",$response->message(),"\r\n";
5036         foreach my $h ($response->header_field_names) {
5037                 next if (lc($h) eq "connection" || lc($h) eq "content-length");
5038                 print STDERR "$h: ",$response->header($h),"\r\n";
5039                 }
5040         print STDERR "Content-length: ",length($content),"\r\n";
5041         print STDERR "\r\n";
5042         print STDERR $content;
5043         print STDERR "---------------------------------------------\n";
5044         }
5045
5046 # Log it
5047 &log_request($acpthost, $authuser, $reqline, $response->code(),
5048              length($response->content()));
5049 }
5050
5051 # get_system_hostname()
5052 # Returns the hostname of this system, for reporting to listeners
5053 sub get_system_hostname
5054 {
5055 # On Windows, try computername environment variable
5056 return $ENV{'computername'} if ($ENV{'computername'});
5057 return $ENV{'COMPUTERNAME'} if ($ENV{'COMPUTERNAME'});
5058
5059 # If a specific command is set, use it first
5060 if ($config{'hostname_command'}) {
5061         local $out = `($config{'hostname_command'}) 2>&1`;
5062         if (!$?) {
5063                 $out =~ s/\r|\n//g;
5064                 return $out;
5065                 }
5066         }
5067
5068 # First try the hostname command
5069 local $out = `hostname 2>&1`;
5070 if (!$? && $out =~ /\S/) {
5071         $out =~ s/\r|\n//g;
5072         return $out;
5073         }
5074
5075 # Try the Sys::Hostname module
5076 eval "use Sys::Hostname";
5077 if (!$@) {
5078         local $rv = eval "hostname()";
5079         if (!$@ && $rv) {
5080                 return $rv;
5081                 }
5082         }
5083
5084 # Must use net name on Windows
5085 local $out = `net name 2>&1`;
5086 if ($out =~ /\-+\r?\n(\S+)/) {
5087         return $1;
5088         }
5089
5090 return undef;
5091 }
5092
5093 # indexof(string, array)
5094 # Returns the index of some value in an array, or -1
5095 sub indexof {
5096   local($i);
5097   for($i=1; $i <= $#_; $i++) {
5098     if ($_[$i] eq $_[0]) { return $i - 1; }
5099   }
5100   return -1;
5101 }
5102
5103
5104 # has_command(command)
5105 # Returns the full path if some command is in the path, undef if not
5106 sub has_command
5107 {
5108 local($d);
5109 if (!$_[0]) { return undef; }
5110 if (exists($has_command_cache{$_[0]})) {
5111         return $has_command_cache{$_[0]};
5112         }
5113 local $rv = undef;
5114 if ($_[0] =~ /^\//) {
5115         $rv = -x $_[0] ? $_[0] : undef;
5116         }
5117 else {
5118         local $sp = $on_windows ? ';' : ':';
5119         foreach $d (split($sp, $ENV{PATH})) {
5120                 if (-x "$d/$_[0]") {
5121                         $rv = "$d/$_[0]";
5122                         last;
5123                         }
5124                 if ($on_windows) {
5125                         foreach my $sfx (".exe", ".com", ".bat") {
5126                                 if (-r "$d/$_[0]".$sfx) {
5127                                         $rv = "$d/$_[0]".$sfx;
5128                                         last;
5129                                         }
5130                                 }
5131                         }
5132                 }
5133         }
5134 $has_command_cache{$_[0]} = $rv;
5135 return $rv;
5136 }
5137
5138 # check_sudo_permissions(user, pass)
5139 # Returns 1 if some user can run any command via sudo
5140 sub check_sudo_permissions
5141 {
5142 local ($user, $pass) = @_;
5143
5144 # First try the pipes
5145 if ($PASSINw) {
5146         print DEBUG "check_sudo_permissions: querying cache for $user\n";
5147         print $PASSINw "readsudo $user\n";
5148         local $can = <$PASSOUTr>;
5149         chop($can);
5150         print DEBUG "check_sudo_permissions: cache said $can\n";
5151         if ($can =~ /^\d+$/ && $can != 2) {
5152                 return int($can);
5153                 }
5154         }
5155
5156 local $ptyfh = new IO::Pty;
5157 print DEBUG "check_sudo_permissions: ptyfh=$ptyfh\n";
5158 if (!$ptyfh) {
5159         print STDERR "Failed to create new PTY with IO::Pty\n";
5160         return 0;
5161         }
5162 local @uinfo = getpwnam($user);
5163 if (!@uinfo) {
5164         print STDERR "Unix user $user does not exist for sudo\n";
5165         return 0;
5166         }
5167
5168 # Execute sudo in a sub-process, via a pty
5169 local $ttyfh = $ptyfh->slave();
5170 print DEBUG "check_sudo_permissions: ttyfh=$ttyfh\n";
5171 local $tty = $ptyfh->ttyname();
5172 print DEBUG "check_sudo_permissions: tty=$tty\n";
5173 chown($uinfo[2], $uinfo[3], $tty);
5174 pipe(SUDOr, SUDOw);
5175 print DEBUG "check_sudo_permissions: about to fork..\n";
5176 local $pid = fork();
5177 print DEBUG "check_sudo_permissions: fork=$pid pid=$$\n";
5178 if ($pid < 0) {
5179         print STDERR "fork for sudo failed : $!\n";
5180         return 0;
5181         }
5182 if (!$pid) {
5183         setsid();
5184         $ptyfh->make_slave_controlling_terminal();
5185         close(STDIN); close(STDOUT); close(STDERR);
5186         untie(*STDIN); untie(*STDOUT); untie(*STDERR);
5187         close($PASSINw); close($PASSOUTr);
5188         ($(, $)) = ( $uinfo[3],
5189                      "$uinfo[3] ".join(" ", $uinfo[3],
5190                                             &other_groups($uinfo[0])) );
5191         ($>, $<) = ($uinfo[2], $uinfo[2]);
5192
5193         close(SUDOw);
5194         close(SOCK);
5195         close(MAIN);
5196         open(STDIN, "<&SUDOr");
5197         open(STDOUT, ">$tty");
5198         open(STDERR, ">&STDOUT");
5199         close($ptyfh);
5200         exec("sudo -l -S");
5201         print "Exec failed : $!\n";
5202         exit 1;
5203         }
5204 print DEBUG "check_sudo_permissions: pid=$pid\n";
5205 close(SUDOr);
5206 $ptyfh->close_slave();
5207
5208 # Send password, and get back response
5209 local $oldfh = select(SUDOw);
5210 $| = 1;
5211 select($oldfh);
5212 print DEBUG "check_sudo_permissions: about to send pass\n";
5213 local $SIG{'PIPE'} = 'ignore';  # Sometimes sudo doesn't ask for a password
5214 print SUDOw $pass,"\n";
5215 print DEBUG "check_sudo_permissions: sent pass=$pass\n";
5216 close(SUDOw);
5217 local $out;
5218 while(<$ptyfh>) {
5219         print DEBUG "check_sudo_permissions: got $_";
5220         $out .= $_;
5221         }
5222 close($ptyfh);
5223 kill('KILL', $pid);
5224 waitpid($pid, 0);
5225 local ($ok) = ($out =~ /\(ALL\)\s+ALL|\(ALL\)\s+NOPASSWD:\s+ALL|\(ALL\s*:\s*ALL\)\s+ALL/ ? 1 : 0);
5226
5227 # Update cache
5228 if ($PASSINw) {
5229         print $PASSINw "writesudo $user $ok\n";
5230         }
5231
5232 return $ok;
5233 }
5234
5235 sub other_groups
5236 {
5237 my ($user) = @_;
5238 my @rv;
5239 setgrent();
5240 while(my @g = getgrent()) {
5241         my @m = split(/\s+/, $g[3]);
5242         push(@rv, $g[2]) if (&indexof($user, @m) >= 0);
5243         }
5244 endgrent();
5245 return @rv;
5246 }
5247
5248 # is_mobile_useragent(agent)
5249 # Returns 1 if some user agent looks like a cellphone or other mobile device,
5250 # such as a treo.
5251 sub is_mobile_useragent
5252 {
5253 local ($agent) = @_;
5254 local @prefixes = (
5255     "UP.Link",    # Openwave
5256     "Nokia",      # All Nokias start with Nokia
5257     "MOT-",       # All Motorola phones start with MOT-
5258     "SAMSUNG",    # Samsung browsers
5259     "Samsung",    # Samsung browsers
5260     "SEC-",       # Samsung browsers
5261     "AU-MIC",     # Samsung browsers
5262     "AUDIOVOX",   # Audiovox
5263     "BlackBerry", # BlackBerry
5264     "hiptop",     # Danger hiptop Sidekick
5265     "SonyEricsson", # Sony Ericsson
5266     "Ericsson",     # Old Ericsson browsers , mostly WAP
5267     "Mitsu/1.1.A",  # Mitsubishi phones
5268     "Panasonic WAP", # Panasonic old WAP phones
5269     "DoCoMo",     # DoCoMo phones
5270     "Lynx",       # Lynx text-mode linux browser
5271     "Links",      # Another text-mode linux browser
5272     );
5273 local @substrings = (
5274     "UP.Browser",         # Openwave
5275     "MobilePhone",        # NetFront
5276     "AU-MIC-A700",        # Samsung A700 Obigo browsers
5277     "Danger hiptop",      # Danger Sidekick hiptop
5278     "Windows CE",         # Windows CE Pocket PC
5279     "IEMobile",           # Windows mobile browser
5280     "Blazer",             # Palm Treo Blazer
5281     "BlackBerry",         # BlackBerries can emulate other browsers, but
5282                           # they still keep this string in the UserAgent
5283     "SymbianOS",          # New Series60 browser has safari in it and
5284                           # SymbianOS is the only distinguishing string
5285     "iPhone",             # Apple iPhone KHTML browser
5286     "iPod",               # iPod touch browser
5287     "MobileSafari",       # HTTP client in iPhone
5288     "Opera Mini",         # Opera Mini
5289     "HTC_P3700",          # HTC mobile device
5290     "Pre/",               # Palm Pre
5291     "webOS/",             # Palm WebOS
5292     "Nintendo DS",        # DSi / DSi-XL
5293     );
5294 local @regexps = (
5295     "Android.*Mobile",    # Android phone
5296     );
5297 foreach my $p (@prefixes) {
5298         return 1 if ($agent =~ /^\Q$p\E/);
5299         }
5300 foreach my $s (@substrings, @mobile_agents) {
5301         return 1 if ($agent =~ /\Q$s\E/);
5302         }
5303 foreach my $s (@regexps) {
5304         return 1 if ($agent =~ /$s/);
5305         }
5306 return 0;
5307 }
5308
5309 # write_blocked_file()
5310 # Writes out a text file of blocked hosts and users
5311 sub write_blocked_file
5312 {
5313 open(BLOCKED, ">$config{'blockedfile'}");
5314 foreach my $d (grep { $hostfail{$_} } @deny) {
5315         print BLOCKED "host $d $hostfail{$d} $blockhosttime{$d}\n";
5316         }
5317 foreach my $d (grep { $userfail{$_} } @denyusers) {
5318         print BLOCKED "user $d $userfail{$d} $blockusertime{$d}\n";
5319         }
5320 close(BLOCKED);
5321 chmod(0700, $config{'blockedfile'});
5322 }
5323
5324 sub write_pid_file
5325 {
5326 open(PIDFILE, ">$config{'pidfile'}");
5327 printf PIDFILE "%d\n", getpid();
5328 close(PIDFILE);
5329 $miniserv_main_pid = getpid();
5330 }
5331
5332 # lock_user_password(user)
5333 # Updates a user's password file entry to lock it, both in memory and on disk.
5334 # Returns 1 if done, -1 if no such user, 0 if already locked
5335 sub lock_user_password
5336 {
5337 local ($user) = @_;
5338 local $uinfo = &get_user_details($user);
5339 if (!$uinfo) {
5340         # No such user!
5341         return -1;
5342         }
5343 if ($uinfo->{'pass'} =~ /^\!/) {
5344         # Already locked
5345         return 0;
5346         }
5347 if (!$uinfo->{'proto'}) {
5348         # Write to users file
5349         $users{$user} = "!".$users{$user};
5350         open(USERS, $config{'userfile'});
5351         local @ufile = <USERS>;
5352         close(USERS);
5353         foreach my $u (@ufile) {
5354                 local @uinfo = split(/:/, $u);
5355                 if ($uinfo[0] eq $user) {
5356                         $uinfo[1] = $users{$user};
5357                         }
5358                 $u = join(":", @uinfo);
5359                 }
5360         open(USERS, ">$config{'userfile'}");
5361         print USERS @ufile;
5362         close(USERS);
5363         return 0;
5364         }
5365
5366 if ($config{'userdb'}) {
5367         # Update user DB
5368         my ($dbh, $proto, $prefix, $args) = &connect_userdb($config{'userdb'});
5369         if (!$dbh) {
5370                 return -1;
5371                 }
5372         elsif ($proto eq "mysql" || $proto eq "postgresql") {
5373                 # Update user attribute
5374                 my $cmd = $dbh->prepare(
5375                         "update webmin_user set pass = ? where id = ?");
5376                 if (!$cmd || !$cmd->execute("!".$uinfo->{'pass'},
5377                                             $uinfo->{'id'})) {
5378                         # Update failed
5379                         print STDERR "Failed to lock password : ",
5380                                      $dbh->errstr,"\n";
5381                         return -1;
5382                         }
5383                 $cmd->finish() if ($cmd);
5384                 }
5385         elsif ($proto eq "ldap") {
5386                 # Update LDAP object
5387                 my $rv = $dbh->modify($uinfo->{'id'},
5388                       replace => { 'webminPass' => '!'.$uinfo->{'pass'} });
5389                 if (!$rv || $rv->code) {
5390                         print STDERR "Failed to lock password : ",
5391                                      ($rv ? $rv->error : "Unknown error"),"\n";
5392                         return -1;
5393                         }
5394                 }
5395         &disconnect_userdb($config{'userdb'}, $dbh);
5396         return 0;
5397         }
5398
5399 return -1;      # This should never be reached
5400 }
5401
5402 # hash_session_id(sid)
5403 # Returns an MD5 or Unix-crypted session ID
5404 sub hash_session_id
5405 {
5406 local ($sid) = @_;
5407 if (!$hash_session_id_cache{$sid}) {
5408         if ($use_md5) {
5409                 # Take MD5 hash
5410                 $hash_session_id_cache{$sid} = &encrypt_md5($sid);
5411                 }
5412         else {
5413                 # Unix crypt
5414                 $hash_session_id_cache{$sid} = &unix_crypt($sid, "XX");
5415                 }
5416         }
5417 return $hash_session_id_cache{$sid};
5418 }
5419
5420 # encrypt_md5(string, [salt])
5421 # Returns a string encrypted in MD5 format
5422 sub encrypt_md5
5423 {
5424 local ($passwd, $salt) = @_;
5425 local $magic = '$1$';
5426 if ($salt =~ /^\$1\$([^\$]+)/) {
5427         # Extract actual salt from already encrypted password
5428         $salt = $1;
5429         }
5430
5431 # Add the password
5432 local $ctx = eval "new $use_md5";
5433 $ctx->add($passwd);
5434 if ($salt) {
5435         $ctx->add($magic);
5436         $ctx->add($salt);
5437         }
5438
5439 # Add some more stuff from the hash of the password and salt
5440 local $ctx1 = eval "new $use_md5";
5441 $ctx1->add($passwd);
5442 if ($salt) {
5443         $ctx1->add($salt);
5444         }
5445 $ctx1->add($passwd);
5446 local $final = $ctx1->digest();
5447 for($pl=length($passwd); $pl>0; $pl-=16) {
5448         $ctx->add($pl > 16 ? $final : substr($final, 0, $pl));
5449         }
5450
5451 # This piece of code seems rather pointless, but it's in the C code that
5452 # does MD5 in PAM so it has to go in!
5453 local $j = 0;
5454 local ($i, $l);
5455 for($i=length($passwd); $i; $i >>= 1) {
5456         if ($i & 1) {
5457                 $ctx->add("\0");
5458                 }
5459         else {
5460                 $ctx->add(substr($passwd, $j, 1));
5461                 }
5462         }
5463 $final = $ctx->digest();
5464
5465 if ($salt) {
5466         # This loop exists only to waste time
5467         for($i=0; $i<1000; $i++) {
5468                 $ctx1 = eval "new $use_md5";
5469                 $ctx1->add($i & 1 ? $passwd : $final);
5470                 $ctx1->add($salt) if ($i % 3);
5471                 $ctx1->add($passwd) if ($i % 7);
5472                 $ctx1->add($i & 1 ? $final : $passwd);
5473                 $final = $ctx1->digest();
5474                 }
5475         }
5476
5477 # Convert the 16-byte final string into a readable form
5478 local $rv;
5479 local @final = map { ord($_) } split(//, $final);
5480 $l = ($final[ 0]<<16) + ($final[ 6]<<8) + $final[12];
5481 $rv .= &to64($l, 4);
5482 $l = ($final[ 1]<<16) + ($final[ 7]<<8) + $final[13];
5483 $rv .= &to64($l, 4);
5484 $l = ($final[ 2]<<16) + ($final[ 8]<<8) + $final[14];
5485 $rv .= &to64($l, 4);
5486 $l = ($final[ 3]<<16) + ($final[ 9]<<8) + $final[15];
5487 $rv .= &to64($l, 4);
5488 $l = ($final[ 4]<<16) + ($final[10]<<8) + $final[ 5];
5489 $rv .= &to64($l, 4);
5490 $l = $final[11];
5491 $rv .= &to64($l, 2);
5492
5493 # Add salt if needed
5494 if ($salt) {
5495         return $magic.$salt.'$'.$rv;
5496         }
5497 else {
5498         return $rv;
5499         }
5500 }
5501
5502 sub to64
5503 {
5504 local ($v, $n) = @_;
5505 local $r;
5506 while(--$n >= 0) {
5507         $r .= $itoa64[$v & 0x3f];
5508         $v >>= 6;
5509         }
5510 return $r;
5511 }
5512
5513 # read_file(file, &assoc, [&order], [lowercase])
5514 # Fill an associative array with name=value pairs from a file
5515 sub read_file
5516 {
5517 open(ARFILE, $_[0]) || return 0;
5518 while(<ARFILE>) {
5519         s/\r|\n//g;
5520         if (!/^#/ && /^([^=]*)=(.*)$/) {
5521                 $_[1]->{$_[3] ? lc($1) : $1} = $2;
5522                 push(@{$_[2]}, $1) if ($_[2]);
5523                 }
5524         }
5525 close(ARFILE);
5526 return 1;
5527 }
5528
5529 # write_file(file, array)
5530 # Write out the contents of an associative array as name=value lines
5531 sub write_file
5532 {
5533 local(%old, @order);
5534 &read_file($_[0], \%old, \@order);
5535 open(ARFILE, ">$_[0]");
5536 foreach $k (@order) {
5537         print ARFILE $k,"=",$_[1]->{$k},"\n" if (exists($_[1]->{$k}));
5538         }
5539 foreach $k (keys %{$_[1]}) {
5540         print ARFILE $k,"=",$_[1]->{$k},"\n" if (!exists($old{$k}));
5541         }
5542 close(ARFILE);
5543 }
5544
5545 # execute_ready_webmin_crons()
5546 # Find and run any cron jobs that are due, based on their last run time and
5547 # execution interval
5548 sub execute_ready_webmin_crons
5549 {
5550 my $now = time();
5551 my $changed = 0;
5552 foreach my $cron (@webmincrons) {
5553         my $run = 0;
5554         if (!$webmincron_last{$cron->{'id'}}) {
5555                 # If not ever run before, don't run right away
5556                 $webmincron_last{$cron->{'id'}} = $now;
5557                 $changed = 1;
5558                 }
5559         elsif ($cron->{'interval'} &&
5560                $now - $webmincron_last{$cron->{'id'}} > $cron->{'interval'}) {
5561                 # Older than interval .. time to run
5562                 $run = 1;
5563                 }
5564         elsif ($cron->{'mins'}) {
5565                 # Check if current time matches spec, and we haven't run in the
5566                 # last minute
5567                 my @tm = localtime($now);
5568                 if (&matches_cron($cron->{'mins'}, $tm[1]) &&
5569                     &matches_cron($cron->{'hours'}, $tm[2]) &&
5570                     &matches_cron($cron->{'days'}, $tm[3]) &&
5571                     &matches_cron($cron->{'months'}, $tm[4]+1) &&
5572                     &matches_cron($cron->{'weekdays'}, $tm[6]) &&
5573                     $now - $webmincron_last{$cron->{'id'}} > 60) {
5574                         $run = 1;
5575                         }
5576                 }
5577
5578         if ($run) {
5579                 print DEBUG "Running cron id=$cron->{'id'} ".
5580                             "module=$cron->{'module'} func=$cron->{'func'}\n";
5581                 $webmincron_last{$cron->{'id'}} = $now;
5582                 $changed = 1;
5583                 my $pid = fork();
5584                 if (!$pid) {
5585                         # Run via a wrapper command, which we run like a CGI
5586                         dbmclose(%sessiondb);
5587
5588                         # Setup CGI-like environment
5589                         $envtz = $ENV{"TZ"};
5590                         $envuser = $ENV{"USER"};
5591                         $envpath = $ENV{"PATH"};
5592                         $envlang = $ENV{"LANG"};
5593                         $envroot = $ENV{"SystemRoot"};
5594                         $envperllib = $ENV{'PERLLIB'};
5595                         foreach my $k (keys %ENV) {
5596                                 delete($ENV{$k});
5597                                 }
5598                         $ENV{"PATH"} = $envpath if ($envpath);
5599                         $ENV{"TZ"} = $envtz if ($envtz);
5600                         $ENV{"USER"} = $envuser if ($envuser);
5601                         $ENV{"OLD_LANG"} = $envlang if ($envlang);
5602                         $ENV{"SystemRoot"} = $envroot if ($envroot);
5603                         $ENV{'PERLLIB'} = $envperllib if ($envperllib);
5604                         $ENV{"HOME"} = $user_homedir;
5605                         $ENV{"SERVER_SOFTWARE"} = $config{"server"};
5606                         $ENV{"SERVER_ADMIN"} = $config{"email"};
5607                         $root0 = $roots[0];
5608                         $ENV{"SERVER_ROOT"} = $root0;
5609                         $ENV{"SERVER_REALROOT"} = $root0;
5610                         $ENV{"SERVER_PORT"} = $config{'port'};
5611                         $ENV{"WEBMIN_CRON"} = 1;
5612                         $ENV{"DOCUMENT_ROOT"} = $root0;
5613                         $ENV{"DOCUMENT_REALROOT"} = $root0;
5614                         $ENV{"MINISERV_CONFIG"} = $config_file;
5615                         $ENV{"HTTPS"} = "ON" if ($use_ssl);
5616                         $ENV{"MINISERV_PID"} = $miniserv_main_pid;
5617                         $ENV{"SCRIPT_FILENAME"} = $config{'webmincron_wrapper'};
5618                         if ($ENV{"SCRIPT_FILENAME"} =~ /^\Q$root0\E(\/.*)$/) {
5619                                 $ENV{"SCRIPT_NAME"} = $1;
5620                                 }
5621                         $config{'webmincron_wrapper'} =~ /^(.*)\//;
5622                         $ENV{"PWD"} = $1;
5623                         foreach $k (keys %config) {
5624                                 if ($k =~ /^env_(\S+)$/) {
5625                                         $ENV{$1} = $config{$k};
5626                                         }
5627                                 }
5628                         chdir($ENV{"PWD"});
5629                         $SIG{'CHLD'} = 'DEFAULT';
5630                         eval {
5631                                 # Have SOCK closed if the perl exec's something
5632                                 use Fcntl;
5633                                 fcntl(SOCK, F_SETFD, FD_CLOEXEC);
5634                                 };
5635
5636                         # Run the wrapper script by evaling it
5637                         $pkg = "webmincron";
5638                         $0 = $config{'webmincron_wrapper'};
5639                         @ARGV = ( $cron );
5640                         $main_process_id = $$;
5641                         eval "
5642                                 \%pkg::ENV = \%ENV;
5643                                 package $pkg;
5644                                 do \$miniserv::config{'webmincron_wrapper'};
5645                                 die \$@ if (\$@);
5646                                 ";
5647                         if ($@) {
5648                                 print STDERR "Perl cron failure : $@\n";
5649                                 }
5650
5651                         exit(0);
5652                         }
5653                 push(@childpids, $pid);
5654                 }
5655         }
5656 if ($changed) {
5657         # Write out file containing last run times
5658         &write_file($config{'webmincron_last'}, \%webmincron_last);
5659         }
5660 }
5661
5662 # matches_cron(cron-spec, time)
5663 # Checks if some minute or hour matches some cron spec, which can be * or a list
5664 # of numbers.
5665 sub matches_cron
5666 {
5667 my ($spec, $tm) = @_;
5668 if ($spec eq '*') {
5669         return 1;
5670         }
5671 else {
5672         foreach my $s (split(/,/, $spec)) {
5673                 if ($s == $tm ||
5674                     $s =~ /^(\d+)\-(\d+)$/ && $tm >= $1 && $tm <= $2) {
5675                         return 1;
5676                         }
5677                 }
5678         return 0;
5679         }
5680 }
5681
5682 # read_webmin_crons()
5683 # Read all scheduled webmin cron functions and store them in the @webmincrons
5684 # global list
5685 sub read_webmin_crons
5686 {
5687 @webmincrons = ( );
5688 opendir(CRONS, $config{'webmincron_dir'});
5689 print DEBUG "Reading crons from $config{'webmincron_dir'}\n";
5690 foreach my $f (readdir(CRONS)) {
5691         if ($f =~ /^(\d+)\.cron$/) {
5692                 my %cron;
5693                 &read_file("$config{'webmincron_dir'}/$f", \%cron);
5694                 $cron{'id'} = $1;
5695                 my $broken = 0;
5696                 foreach my $n ('module', 'func') {
5697                         if (!$cron{$n}) {
5698                                 print STDERR "Cron $1 missing $n\n";
5699                                 $broken = 1;
5700                                 }
5701                         }
5702                 if (!$cron{'interval'} && !$cron{'mins'} && !$cron{'special'}) {
5703                         print STDERR "Cron $1 missing any time spec\n";
5704                         $broken = 1;
5705                         }
5706                 if ($cron{'special'} eq 'hourly') {
5707                         # Run every hour on the hour
5708                         $cron{'mins'} = 0;
5709                         $cron{'hours'} = '*';
5710                         $cron{'days'} = '*';
5711                         $cron{'months'} = '*';
5712                         $cron{'weekdays'} = '*';
5713                         }
5714                 elsif ($cron{'special'} eq 'daily') {
5715                         # Run every day at midnight
5716                         $cron{'mins'} = 0;
5717                         $cron{'hours'} = '0';
5718                         $cron{'days'} = '*';
5719                         $cron{'months'} = '*';
5720                         $cron{'weekdays'} = '*';
5721                         }
5722                 elsif ($cron{'special'} eq 'monthly') {
5723                         # Run every month on the 1st
5724                         $cron{'mins'} = 0;
5725                         $cron{'hours'} = '0';
5726                         $cron{'days'} = '1';
5727                         $cron{'months'} = '*';
5728                         $cron{'weekdays'} = '*';
5729                         }
5730                 elsif ($cron{'special'} eq 'weekly') {
5731                         # Run every month on the 1st
5732                         $cron{'mins'} = 0;
5733                         $cron{'hours'} = '0';
5734                         $cron{'days'} = '*';
5735                         $cron{'months'} = '*';
5736                         $cron{'weekdays'} = '0';
5737                         }
5738                 elsif ($cron{'special'} eq 'yearly' ||
5739                        $cron{'special'} eq 'annually') {
5740                         # Run every year on 1st january
5741                         $cron{'mins'} = 0;
5742                         $cron{'hours'} = '0';
5743                         $cron{'days'} = '1';
5744                         $cron{'months'} = '1';
5745                         $cron{'weekdays'} = '*';
5746                         }
5747                 elsif ($cron{'special'}) {
5748                         print STDERR "Cron $1 invalid special time $cron{'special'}\n";
5749                         $broken = 1;
5750                         }
5751                 if ($cron{'special'}) {
5752                         delete($cron{'special'});
5753                         }
5754                 if (!$broken) {
5755                         print DEBUG "adding cron id=$cron{'id'} module=$cron{'module'} func=$cron{'func'}\n";
5756                         push(@webmincrons, \%cron);
5757                         }
5758                 }
5759         }
5760 }
5761
5762 # precache_files()
5763 # Read into the Webmin cache all files marked for pre-caching
5764 sub precache_files
5765 {
5766 undef(%main::read_file_cache);
5767 foreach my $g (split(/\s+/, $config{'precache'})) {
5768         next if ($g eq "none");
5769         foreach my $f (glob("$config{'root'}/$g")) {
5770                 my @st = stat($f);
5771                 next if (!@st);
5772                 $main::read_file_cache{$f} = { };
5773                 &read_file($f, $main::read_file_cache{$f});
5774                 $main::read_file_cache_time{$f} = $st[9];
5775                 }
5776         }
5777 }
5778
5779 # Check if some address is valid IPv4, returns 1 if so.
5780 sub check_ipaddress
5781 {
5782 return $_[0] =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/ &&
5783         $1 >= 0 && $1 <= 255 &&
5784         $2 >= 0 && $2 <= 255 &&
5785         $3 >= 0 && $3 <= 255 &&
5786         $4 >= 0 && $4 <= 255;
5787 }
5788
5789 # Check if some IPv6 address is properly formatted, and returns 1 if so.
5790 sub check_ip6address
5791 {
5792   my @blocks = split(/:/, $_[0]);
5793   return 0 if (@blocks == 0 || @blocks > 8);
5794   my $ib = $#blocks;
5795   my $where = index($blocks[$ib],"/");
5796   my $m = 0;
5797   if ($where != -1) {
5798     my $b = substr($blocks[$ib],0,$where);
5799     $m = substr($blocks[$ib],$where+1,length($blocks[$ib])-($where+1));
5800     $blocks[$ib]=$b;
5801   }
5802   return 0 if ($m <0 || $m >128);
5803   my $b;
5804   my $empty = 0;
5805   foreach $b (@blocks) {
5806           return 0 if ($b ne "" && $b !~ /^[0-9a-f]{1,4}$/i);
5807           $empty++ if ($b eq "");
5808           }
5809   return 0 if ($empty > 1 && !($_[0] =~ /^::/ && $empty == 2));
5810   return 1;
5811 }
5812
5813 # network_to_address(binary)
5814 # Given a network address in binary IPv4 or v4 format, return the string form
5815 sub network_to_address
5816 {
5817 local ($addr) = @_;
5818 if (length($addr) == 4 || !$use_ipv6) {
5819         return inet_ntoa($addr);
5820         }
5821 else {
5822         return Socket6::inet_ntop(Socket6::AF_INET6(), $addr);
5823         }
5824 }
5825
5826 # redirect_stderr_to_log()
5827 # Re-direct STDERR to error log file
5828 sub redirect_stderr_to_log
5829 {
5830 if ($config{'errorlog'} ne '-') {
5831         open(STDERR, ">>$config{'errorlog'}") ||
5832                 die "failed to open $config{'errorlog'} : $!";
5833         if ($config{'logperms'}) {
5834                 chmod(oct($config{'logperms'}), $config{'errorlog'});
5835                 }
5836         }
5837 select(STDERR); $| = 1; select(STDOUT);
5838 }
5839
5840 # should_gzip_file(filename)
5841 # Returns 1 if some path should be gzipped
5842 sub should_gzip_file
5843 {
5844 my ($path) = @_;
5845 return $path !~ /\.(gif|png|jpg|jpeg|tif|tiff)$/i;
5846 }
5847
5848 # get_expires_time(path)
5849 # Given a URL path, return the client-side expiry time in seconds
5850 sub get_expires_time
5851 {
5852 my ($path) = @_;
5853 foreach my $pe (@expires_paths) {
5854         if ($path =~ /$pe->[0]/i) {
5855                 return $pe->[1];
5856                 }
5857         }
5858 return $config{'expires'};
5859 }
5860