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