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