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
  29 # Check is SSL is enabled and available
  30 if ($config{'ssl'}) {
  31         eval "use Net::SSLeay";
  32         if (!$@) {
  33                 $use_ssl = 1;
  34                 # These functions only exist for SSLeay 1.0
  35                 eval "Net::SSLeay::SSLeay_add_ssl_algorithms()";
  36                 eval "Net::SSLeay::load_error_strings()";
  37                 if ($config{'no_ssl2'}) {
  38                         eval "Net::SSLeay::CTX_set_options($ctx,&Net::SSLeay::OP_NO_SSLv2)";
  39                         }
  40                 if (defined(&Net::SSLeay::X509_STORE_CTX_get_current_cert) &&
  41                     defined(&Net::SSLeay::CTX_load_verify_locations) &&
  42                     defined(&Net::SSLeay::CTX_set_verify)) {
  43                         $client_certs = 1;
  44                         }
  45                 }
  46         }
  47
  48 # Check if the syslog module is available to log hacking attempts
  49 if ($config{'syslog'} && !$config{'inetd'}) {
  50         eval "use Sys::Syslog qw(:DEFAULT setlogsock)";
  51         if (!$@) {
  52                 $use_syslog = 1;
  53                 }
  54         }
  55
  56 # check if the TCP-wrappers module is available
  57 if ($config{'libwrap'}) {
  58         eval "use Authen::Libwrap qw(hosts_ctl STRING_UNKNOWN)";
  59         if (!$@) {
  60                 $use_libwrap = 1;
  61                 }
  62         }
  63
  64 # Check if the MD5 perl module is available
  65 eval "use MD5";
  66 if (!$@) {
  67         $use_md5 = "MD5";
  68         }
  69 else {
  70         eval "use Digest::MD5";
  71         if (!$@) {
  72                 $use_md5 = "Digest::MD5";
  73                 }
  74         }
  75
  76 # Get miniserv's perl path and location
  77 $miniserv_path = $0;
  78 open(SOURCE, $miniserv_path);
  79 <SOURCE> =~ /^#!(\S+)/;
  80 $perl_path = $1;
  81 close(SOURCE);
  82 if (!-x $perl_path) {
  83         $perl_path = $^X;
  84         }
  85 if (-l $perl_path) {
  86         $linked_perl_path = readlink($perl_path);
  87         }
  88 @miniserv_argv = @ARGV;
  89
  90 # Check vital config options
  91 &update_vital_config();
  92
  93 $sidname = $config{'sidname'};
  94 die "Session authentication cannot be used in inetd mode"
  95         if ($config{'inetd'} && $config{'session'});
  96
  97 # check if the PAM module is available to authenticate
  98 if ($config{'assume_pam'}) {
  99         # Just assume that it will work. This can also be used to work around
 100         # a Solaris bug in which using PAM before forking caused it to fail
 101         # later!
 102         $use_pam = 1;
 103         }
 104 elsif (!$config{'no_pam'}) {
 105         eval "use Authen::PAM;";
 106         if (!$@) {
 107                 # check if the PAM authentication can be used by opening a
 108                 # PAM handle
 109                 local $pamh;
 110                 if (ref($pamh = new Authen::PAM($config{'pam'},
 111                                                 $config{'pam_test_user'},
 112                                                 \&pam_conv_func))) {
 113                         # Now test a login to see if /etc/pam.d/webmin is set
 114                         # up properly.
 115                         $pam_conv_func_called = 0;
 116                         $pam_username = "test";
 117                         $pam_password = "test";
 118                         $pamh->pam_authenticate();
 119                         if ($pam_conv_func_called) {
 120                                 $pam_msg = "PAM authentication enabled";
 121                                 $use_pam = 1;
 122                                 }
 123                         else {
 124                                 $pam_msg = "PAM test failed - maybe /etc/pam.d/$config{'pam'} does not exist";
 125                                 }
 126                         }
 127                 else {
 128                         $pam_msg = "PAM initialization of Authen::PAM failed";
 129                         }
 130                 }
 131         else {
 132                 $pam_msg = "Perl module Authen::PAM needed for PAM is not installed : $@";
 133                 }
 134         }
 135 if ($config{'pam_only'} && !$use_pam) {
 136         print STDERR $pam_msg;
 137         print STDERR "PAM use is mandatory, but could not be enabled!\n";
 138         exit(1);
 139         }
 140 elsif ($pam_msg && !$use_pam) {
 141         $pam_msg2 = "Continuing without the Authen::PAM perl module";
 142         }
 143
 144 # Check if the User::Utmp perl module is installed
 145 if ($config{'utmp'}) {
 146         eval "use User::Utmp;";
 147         if (!$@) {
 148                 $write_utmp = 1;
 149                 $utmp_msg = "UTMP logging enabled";
 150                 }
 151         else {
 152                 $utmp_msg = "Perl module User::Utmp needed for Utmp logging is not installed : $@";
 153                 }
 154         }
 155
 156 # See if the crypt function fails
 157 eval "crypt('foo', 'xx')";
 158 if ($@) {
 159         eval "use Crypt::UnixCrypt";
 160         if (!$@) {
 161                 $use_perl_crypt = 1;
 162                 $crypt_msg = "Using Crypt::UnixCrypt for password encryption\n";
 163                 }
 164         else {
 165                 $crypt_msg = "crypt() function un-implemented, and Crypt::UnixCrypt not installed - password authentication will probably fail\n";
 166                 }
 167         }
 168
 169 # Check if /dev/urandom really generates random IDs, by calling it twice
 170 local $rand1 = &generate_random_id("foo", 1);
 171 local $rand2 = &generate_random_id("foo", 2);
 172 local $rand_msg;
 173 if ($rand1 eq $rand2) {
 174         $bad_urandom = 1;
 175         $rand_msg = "Random number generator file /dev/urandom is not reliable";
 176         }
 177
 178 # Check if we can call sudo
 179 if ($config{'sudo'} && &has_command("sudo")) {
 180         eval "use IO::Pty";
 181         if (!$@) {
 182                 $use_sudo = 1;
 183                 }
 184         else {
 185                 $sudo_msg = "Perl module IO::Pty needed for calling sudo is not installed : $@";
 186                 }
 187         }
 188
 189 # init days and months for http_date
 190 @weekday = ( "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" );
 191 @month = ( "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 192            "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" );
 193
 194 # Change dir to the server root
 195 @roots = ( $config{'root'} );
 196 for($i=0; defined($config{"extraroot_$i"}); $i++) {
 197         push(@roots, $config{"extraroot_$i"});
 198         }
 199 chdir($roots[0]);
 200 eval { $user_homedir = (getpwuid($<))[7]; };
 201 if ($@) {
 202         # getpwuid doesn't work on windows
 203         $user_homedir = $ENV{"HOME"} || $ENV{"USERPROFILE"} || "/";
 204         $on_windows = 1;
 205         }
 206
 207 # Read users file
 208 &read_users_file();
 209
 210 # Setup SSL if possible and if requested
 211 if (!-r $config{'keyfile'} ||
 212     $config{'certfile'} && !-r $config{'certfile'}) {
 213         # Key file doesn't exist!
 214         $use_ssl = 0;
 215         }
 216 @ipkeys = &get_ipkeys(\%config);
 217 if ($use_ssl) {
 218         if ($config{'ssl_version'}) {
 219                 # Force an SSL version
 220                 $Net::SSLeay::version = $config{'ssl_version'};
 221                 $Net::SSLeay::ssl_version = $config{'ssl_version'};
 222                 }
 223         $client_certs = 0 if (!-r $config{'ca'} || !%certs);
 224         $ssl_contexts{"*"} = &create_ssl_context($config{'keyfile'},
 225                                                  $config{'certfile'});
 226         foreach $ipkey (@ipkeys) {
 227                 $ctx = &create_ssl_context($ipkey->{'key'}, $ipkey->{'cert'});
 228                 foreach $ip (@{$ipkey->{'ips'}}) {
 229                         $ssl_contexts{$ip} = $ctx;
 230                         }
 231                 }
 232         }
 233
 234 # Setup syslog support if possible and if requested
 235 if ($use_syslog) {
 236         open(ERRDUP, ">&STDERR");
 237         open(STDERR, ">/dev/null");
 238         $log_socket = $config{"logsock"} || "unix";
 239         eval 'openlog($config{"pam"}, "cons,pid,ndelay", "authpriv"); setlogsock($log_socket)';
 240         if ($@) {
 241                 $use_syslog = 0;
 242                 }
 243         else {
 244                 local $msg = ucfirst($config{'pam'})." starting";
 245                 eval { syslog("info", "%s", $msg); };
 246                 if ($@) {
 247                         eval {
 248                                 setlogsock("inet");
 249                                 syslog("info", "%s", $msg);
 250                                 };
 251                         if ($@) {
 252                                 # All attempts to use syslog have failed..
 253                                 $use_syslog = 0;
 254                                 }
 255                         }
 256                 }
 257         open(STDERR, ">&ERRDUP");
 258         close(ERRDUP);
 259         }
 260
 261 # Read MIME types file and add extra types
 262 &read_mime_types();
 263
 264 # get the time zone
 265 if ($config{'log'}) {
 266         local(@gmt, @lct, $days, $hours, $mins);
 267         @gmt = gmtime(time());
 268         @lct = localtime(time());
 269         $days = $lct[3] - $gmt[3];
 270         $hours = ($days < -1 ? 24 : 1 < $days ? -24 : $days * 24) +
 271                  $lct[2] - $gmt[2];
 272         $mins = $hours * 60 + $lct[1] - $gmt[1];
 273         $timezone = ($mins < 0 ? "-" : "+"); $mins = abs($mins);
 274         $timezone .= sprintf "%2.2d%2.2d", $mins/60, $mins%60;
 275         }
 276
 277 # Build various maps from the config files
 278 &build_config_mappings();
 279
 280 # start up external authentication program, if needed
 281 if ($config{'extauth'}) {
 282         socketpair(EXTAUTH, EXTAUTH2, AF_UNIX, SOCK_STREAM, PF_UNSPEC);
 283         if (!($extauth = fork())) {
 284                 close(EXTAUTH);
 285                 close(STDIN);
 286                 close(STDOUT);
 287                 open(STDIN, "<&EXTAUTH2");
 288                 open(STDOUT, ">&EXTAUTH2");
 289                 exec($config{'extauth'}) or die "exec failed : $!\n";
 290                 }
 291         close(EXTAUTH2);
 292         local $os = select(EXTAUTH);
 293         $| = 1; select($os);
 294         }
 295
 296 # Pre-load any libraries
 297 if (!$config{'inetd'}) {
 298         foreach $pl (split(/\s+/, $config{'preload'})) {
 299                 ($pkg, $lib) = split(/=/, $pl);
 300                 $pkg =~ s/[^A-Za-z0-9]/_/g;
 301                 eval "package $pkg; do '$config{'root'}/$lib'";
 302                 if ($@) {
 303                         print STDERR "Failed to pre-load $lib in $pkg : $@\n";
 304                         }
 305                 else {
 306                         print STDERR "Pre-loaded $lib in $pkg\n";
 307                         }
 308                 }
 309         foreach $pl (split(/\s+/, $config{'premodules'})) {
 310                 if ($pl =~ /\//) {
 311                         ($dir, $mod) = split(/\//, $pl);
 312                         }
 313                 else {
 314                         ($dir, $mod) = (undef, $pl);
 315                         }
 316                 push(@INC, "$config{'root'}/$dir");
 317                 eval "package $mod; use $mod ()";
 318                 if ($@) {
 319                         print STDERR "Failed to pre-load $mod : $@\n";
 320                         }
 321                 else {
 322                         print STDERR "Pre-loaded $mod\n";
 323                         }
 324                 }
 325         }
 326
 327 # Open debug log if set
 328 if ($config{'debuglog'}) {
 329         open(DEBUG, ">>$config{'debuglog'}");
 330         chmod(0700, $config{'debuglog'});
 331         select(DEBUG); $| = 1; select(STDOUT);
 332         print DEBUG "miniserv.pl starting ..\n";
 333         }
 334
 335 # Write out (empty) blocked hosts file
 336 &write_blocked_file();
 337
 338 # Initially read webmin cron functions and last execution times
 339 &read_webmin_crons();
 340 %webmincron_last = ( );
 341 &read_file($config{'webmincron_last'}, \%webmincron_last);
 342
 343 # Re-direct STDERR to a log file
 344 if ($config{'errorlog'} ne '-') {
 345         open(STDERR, ">>$config{'errorlog'}") || die "failed to open $config{'errorlog'} : $!";
 346         if ($config{'logperms'}) {
 347                 chmod(oct($config{'logperms'}), $config{'errorlog'});
 348                 }
 349         }
 350 select(STDERR); $| = 1; select(STDOUT);
 351
 352 if ($config{'inetd'}) {
 353         # We are being run from inetd - go direct to handling the request
 354         $SIG{'HUP'} = 'IGNORE';
 355         $SIG{'TERM'} = 'DEFAULT';
 356         $SIG{'PIPE'} = 'DEFAULT';
 357         open(SOCK, "+>&STDIN");
 358
 359         # Check if it is time for the logfile to be cleared
 360         if ($config{'logclear'}) {
 361                 local $write_logtime = 0;
 362                 local @st = stat("$config{'logfile'}.time");
 363                 if (@st) {
 364                         if ($st[9]+$config{'logtime'}*60*60 < time()){
 365                                 # need to clear log
 366                                 $write_logtime = 1;
 367                                 unlink($config{'logfile'});
 368                                 }
 369                         }
 370                 else { $write_logtime = 1; }
 371                 if ($write_logtime) {
 372                         open(LOGTIME, ">$config{'logfile'}.time");
 373                         print LOGTIME time(),"\n";
 374                         close(LOGTIME);
 375                         }
 376                 }
 377
 378         # Initialize SSL for this connection
 379         if ($use_ssl) {
 380                 $ssl_con = &ssl_connection_for_ip(SOCK);
 381                 $ssl_con || exit;
 382                 }
 383
 384         # Work out the hostname for this web server
 385         $host = &get_socket_name(SOCK);
 386         $host || exit;
 387         $port = $config{'port'};
 388         $acptaddr = getpeername(SOCK);
 389         $acptaddr || exit;
 390
 391         print DEBUG "main: Starting handle_request loop pid=$$\n";
 392         while(&handle_request($acptaddr, getsockname(SOCK))) { }
 393         print DEBUG "main: Done handle_request loop pid=$$\n";
 394         close(SOCK);
 395         exit;
 396         }
 397
 398 # Build list of sockets to listen on
 399 if ($config{"bind"} && $config{"bind"} ne "*") {
 400         push(@sockets, [ inet_aton($config{'bind'}), $config{'port'} ]);
 401         }
 402 else {
 403         push(@sockets, [ INADDR_ANY, $config{'port'} ]);
 404         }
 405 foreach $s (split(/\s+/, $config{'sockets'})) {
 406         if ($s =~ /^(\d+)$/) {
 407                 # Just listen on another port on the main IP
 408                 push(@sockets, [ $sockets[0]->[0], $s ]);
 409                 }
 410         elsif ($s =~ /^(\S+):(\d+)$/) {
 411                 # Listen on a specific port and IP
 412                 push(@sockets, [ $1 eq "*" ? INADDR_ANY : inet_aton($1), $2 ]);
 413                 }
 414         elsif ($s =~ /^([0-9\.]+):\*$/ || $s =~ /^([0-9\.]+)$/) {
 415                 # Listen on the main port on another IP
 416                 push(@sockets, [ inet_aton($1), $sockets[0]->[1] ]);
 417                 }
 418         }
 419
 420 # Open all the sockets
 421 $proto = getprotobyname('tcp');
 422 @sockerrs = ( );
 423 $tried_inaddr_any = 0;
 424 for($i=0; $i<@sockets; $i++) {
 425         $fh = "MAIN$i";
 426         socket($fh, PF_INET, SOCK_STREAM, $proto) ||
 427                 die "Failed to open socket : $!";
 428         setsockopt($fh, SOL_SOCKET, SO_REUSEADDR, pack("l", 1));
 429         for($j=0; $j<5; $j++) {
 430                 last if (bind($fh, pack_sockaddr_in($sockets[$i]->[1],
 431                                                     $sockets[$i]->[0])));
 432                 sleep(1);
 433                 }
 434         if ($j == 5) {
 435                 # All attempts failed .. give up
 436                 if ($sockets[$i]->[0] eq INADDR_ANY) {
 437                         push(@sockerrs, "Failed to bind to port $sockets[$i]->[1] : $!");
 438                         $tried_inaddr_any = 1;
 439                         }
 440                 else {
 441                         $ip = inet_ntoa($sockets[$i]->[0]);
 442                         push(@sockerrs, "Failed to bind to IP $ip port $sockets[$i]->[1] : $!");
 443                         }
 444                 }
 445         else {
 446                 listen($fh, SOMAXCONN);
 447                 push(@socketfhs, $fh);
 448                 }
 449         }
 450 foreach $se (@sockerrs) {
 451         print STDERR $se,"\n";
 452         }
 453
 454 # If all binds failed, try binding to any address
 455 if (!@socketfhs && !$tried_inaddr_any) {
 456         print STDERR "Falling back to listening on any address\n";
 457         $fh = "MAIN";
 458         socket($fh, PF_INET, SOCK_STREAM, $proto) ||
 459                 die "Failed to open socket : $!";
 460         setsockopt($fh, SOL_SOCKET, SO_REUSEADDR, pack("l", 1));
 461         bind($fh, pack_sockaddr_in($sockets[0]->[1], INADDR_ANY)) ||
 462                 die "Failed to bind to port $sockets[0]->[1] : $!";
 463         listen($fh, SOMAXCONN);
 464         push(@socketfhs, $fh);
 465         }
 466 elsif (!@socketfhs && $tried_inaddr_any) {
 467         die "Could not listen on any ports";
 468         }
 469
 470 if ($config{'listen'}) {
 471         # Open the socket that allows other webmin servers to find this one
 472         $proto = getprotobyname('udp');
 473         if (socket(LISTEN, PF_INET, SOCK_DGRAM, $proto)) {
 474                 setsockopt(LISTEN, SOL_SOCKET, SO_REUSEADDR, pack("l", 1));
 475                 bind(LISTEN, pack_sockaddr_in($config{'listen'}, INADDR_ANY));
 476                 listen(LISTEN, SOMAXCONN);
 477                 }
 478         else {
 479                 $config{'listen'} = 0;
 480                 }
 481         }
 482
 483 # Split from the controlling terminal, unless configured not to
 484 if (!$config{'nofork'}) {
 485         if (fork()) { exit; }
 486         }
 487 eval { setsid(); };     # may not work on Windows
 488
 489 # Close standard file handles
 490 open(STDIN, "</dev/null");
 491 open(STDOUT, ">/dev/null");
 492 &log_error("miniserv.pl started");
 493 &log_error($pam_msg) if ($pam_msg);
 494 &log_error($pam_msg2) if ($pam_msg2);
 495 &log_error($utmp_msg) if ($utmp_msg);
 496 &log_error($crypt_msg) if ($crypt_msg);
 497 &log_error($sudo_msg) if ($sudo_msg);
 498 &log_error($rand_msg) if ($rand_msg);
 499
 500 # write out the PID file
 501 &write_pid_file();
 502
 503 # Start the log-clearing process, if needed. This checks every minute
 504 # to see if the log has passed its reset time, and if so clears it
 505 if ($config{'logclear'}) {
 506         if (!($logclearer = fork())) {
 507                 &close_all_sockets();
 508                 close(LISTEN);
 509                 while(1) {
 510                         local $write_logtime = 0;
 511                         local @st = stat("$config{'logfile'}.time");
 512                         if (@st) {
 513                                 if ($st[9]+$config{'logtime'}*60*60 < time()){
 514                                         # need to clear log
 515                                         $write_logtime = 1;
 516                                         unlink($config{'logfile'});
 517                                         }
 518                                 }
 519                         else { $write_logtime = 1; }
 520                         if ($write_logtime) {
 521                                 open(LOGTIME, ">$config{'logfile'}.time");
 522                                 print LOGTIME time(),"\n";
 523                                 close(LOGTIME);
 524                                 }
 525                         sleep(5*60);
 526                         }
 527                 exit;
 528                 }
 529         push(@childpids, $logclearer);
 530         }
 531
 532 # Setup the logout time dbm if needed
 533 if ($config{'session'}) {
 534         eval "use SDBM_File";
 535         dbmopen(%sessiondb, $config{'sessiondb'}, 0700);
 536         eval "\$sessiondb{'1111111111'} = 'foo bar';";
 537         if ($@) {
 538                 dbmclose(%sessiondb);
 539                 eval "use NDBM_File";
 540                 dbmopen(%sessiondb, $config{'sessiondb'}, 0700);
 541                 }
 542         else {
 543                 delete($sessiondb{'1111111111'});
 544                 }
 545         }
 546
 547 # Run the main loop
 548 $SIG{'HUP'} = 'miniserv::trigger_restart';
 549 $SIG{'TERM'} = 'miniserv::term_handler';
 550 $SIG{'USR1'} = 'miniserv::trigger_reload';
 551 $SIG{'PIPE'} = 'IGNORE';
 552 local $remove_session_count = 0;
 553 $need_pipes = $config{'passdelay'} || $config{'session'};
 554 while(1) {
 555         # wait for a new connection, or a message from a child process
 556         local ($i, $rmask);
 557         if (@childpids <= $config{'maxconns'}) {
 558                 # Only accept new main socket connects when ready
 559                 local $s;
 560                 foreach $s (@socketfhs) {
 561                         vec($rmask, fileno($s), 1) = 1;
 562                         }
 563                 }
 564         else {
 565                 printf STDERR "too many children (%d > %d)\n",
 566                         scalar(@childpids), $config{'maxconns'};
 567                 }
 568         if ($need_pipes) {
 569                 for($i=0; $i<@passin; $i++) {
 570                         vec($rmask, fileno($passin[$i]), 1) = 1;
 571                         }
 572                 }
 573         vec($rmask, fileno(LISTEN), 1) = 1 if ($config{'listen'});
 574
 575         # Wait for a connection
 576         local $sel = select($rmask, undef, undef, 10);
 577
 578         # Check the flag files
 579         if ($config{'restartflag'} && -r $config{'restartflag'}) {
 580                 print STDERR "restart flag file detected\n";
 581                 unlink($config{'restartflag'});
 582                 $need_restart = 1;
 583                 }
 584         if ($config{'reloadflag'} && -r $config{'reloadflag'}) {
 585                 unlink($config{'reloadflag'});
 586                 $need_reload = 1;
 587                 }
 588
 589         if ($need_restart) {
 590                 # Got a HUP signal while in select() .. restart now
 591                 &restart_miniserv();
 592                 }
 593         if ($need_reload) {
 594                 # Got a USR1 signal while in select() .. re-read config
 595                 $need_reload = 0;
 596                 &reload_config_file();
 597                 }
 598         local $time_now = time();
 599
 600         # Clean up finished processes
 601         local $pid;
 602         do {    $pid = waitpid(-1, WNOHANG);
 603                 @childpids = grep { $_ != $pid } @childpids;
 604                 } while($pid != 0 && $pid != -1);
 605
 606         # run the unblocking procedure to check if enough time has passed to
 607         # unblock hosts that heve been blocked because of password failures
 608         $unblocked = 0;
 609         if ($config{'blockhost_failures'}) {
 610                 $i = 0;
 611                 while ($i <= $#deny) {
 612                         if ($blockhosttime{$deny[$i]} &&
 613                             $config{'blockhost_time'} != 0 &&
 614                             ($time_now - $blockhosttime{$deny[$i]}) >=
 615                              $config{'blockhost_time'}) {
 616                                 # the host can be unblocked now
 617                                 $hostfail{$deny[$i]} = 0;
 618                                 splice(@deny, $i, 1);
 619                                 $unblocked = 1;
 620                                 }
 621                         $i++;
 622                         }
 623                 }
 624
 625         # Do the same for blocked users
 626         if ($config{'blockuser_failures'}) {
 627                 $i = 0;
 628                 while ($i <= $#deny) {
 629                         if ($blockusertime{$deny[$i]} &&
 630                             $config{'blockuser_time'} != 0 &&
 631                             ($time_now - $blockusertime{$deny[$i]}) >=
 632                              $config{'blockuser_time'}) {
 633                                 # the user can be unblocked now
 634                                 $userfail{$deny[$i]} = 0;
 635                                 splice(@denyusers, $i, 1);
 636                                 $unblocked = 1;
 637                                 }
 638                         $i++;
 639                         }
 640                 }
 641         if ($unblocked) {
 642                 &write_blocked_file();
 643                 }
 644
 645         # Check if any webmin cron jobs are ready to run
 646         &execute_ready_webmin_crons();
 647
 648         if ($config{'session'} && (++$remove_session_count%50) == 0) {
 649                 # Remove sessions with more than 7 days of inactivity,
 650                 local $s;
 651                 foreach $s (keys %sessiondb) {
 652                         local ($user, $ltime, $lip) =
 653                                 split(/\s+/, $sessiondb{$s});
 654                         if ($time_now - $ltime > 7*24*60*60) {
 655                                 &run_logout_script($s, $user);
 656                                 &write_logout_utmp($user, $lip);
 657                                 delete($sessiondb{$s});
 658                                 if ($use_syslog) {
 659                                         syslog("info", "%s",
 660                                               "Timeout of session for $user");
 661                                         }
 662                                 }
 663                         }
 664                 }
 665
 666         if ($use_pam && $config{'pam_conv'}) {
 667                 # Remove PAM sessions with more than 5 minutes of inactivity
 668                 local $c;
 669                 foreach $c (values %conversations) {
 670                         if ($time_now - $c->{'time'} > 5*60) {
 671                                 &end_pam_conversation($c);
 672                                 if ($use_syslog) {
 673                                         syslog("info", "%s", "Timeout of PAM ".
 674                                                 "session for $c->{'user'}");
 675                                         }
 676                                 }
 677                         }
 678                 }
 679
 680         # Don't check any sockets if there is no activity
 681         next if ($sel <= 0);
 682
 683         # Check if any of the main sockets have received a new connection
 684         local $sn = 0;
 685         foreach $s (@socketfhs) {
 686                 if (vec($rmask, fileno($s), 1)) {
 687                         # got new connection
 688                         $acptaddr = accept(SOCK, $s);
 689                         if (!$acptaddr) { next; }
 690                         binmode(SOCK);  # turn off any Perl IO stuff
 691
 692                         # create pipes
 693                         local ($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw);
 694                         if ($need_pipes) {
 695                                 ($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw) =
 696                                         &allocate_pipes();
 697                                 }
 698
 699                         # Check username of connecting user
 700                         local ($peerp, $peera) = unpack_sockaddr_in($acptaddr);
 701                         $localauth_user = undef;
 702                         if ($config{'localauth'} && inet_ntoa($peera) eq "127.0.0.1") {
 703                                 if (open(TCP, "/proc/net/tcp")) {
 704                                         # Get the info direct from the kernel
 705                                         while(<TCP>) {
 706                                                 s/^\s+//;
 707                                                 local @t = split(/[\s:]+/, $_);
 708                                                 if ($t[1] eq '0100007F' &&
 709                                                     $t[2] eq sprintf("%4.4X", $peerp)) {
 710                                                         $localauth_user = getpwuid($t[11]);
 711                                                         last;
 712                                                         }
 713                                                 }
 714                                         close(TCP);
 715                                         }
 716                                 if (!$localauth_user) {
 717                                         # Call lsof for the info
 718                                         local $lsofpid = open(LSOF,
 719                                                 "$config{'localauth'} -i TCP\@127.0.0.1:$peerp |");
 720                                         while(<LSOF>) {
 721                                                 if (/^(\S+)\s+(\d+)\s+(\S+)/ &&
 722                                                     $2 != $$ && $2 != $lsofpid) {
 723                                                         $localauth_user = $3;
 724                                                         }
 725                                                 }
 726                                         close(LSOF);
 727                                         }
 728                                 }
 729
 730                         # Work out the hostname for this web server
 731                         $host = &get_socket_name(SOCK);
 732                         if (!$host) {
 733                                 print STDERR "Failed to get local socket name : $!\n";
 734                                 close(SOCK);
 735                                 next;
 736                                 }
 737                         $port = $sockets[$sn]->[1];
 738
 739                         # fork the subprocess
 740                         local $handpid;
 741                         if (!($handpid = fork())) {
 742                                 # setup signal handlers
 743                                 $SIG{'TERM'} = 'DEFAULT';
 744                                 $SIG{'PIPE'} = 'DEFAULT';
 745                                 #$SIG{'CHLD'} = 'IGNORE';
 746                                 $SIG{'HUP'} = 'IGNORE';
 747                                 $SIG{'USR1'} = 'IGNORE';
 748
 749                                 # Initialize SSL for this connection
 750                                 if ($use_ssl) {
 751                                         $ssl_con = &ssl_connection_for_ip(SOCK);
 752                                         $ssl_con || exit;
 753                                         }
 754
 755                                 # Close the file handle for the session DBM
 756                                 dbmclose(%sessiondb);
 757
 758                                 # close useless pipes
 759                                 if ($need_pipes) {
 760                                         &close_all_pipes();
 761                                         close($PASSINr); close($PASSOUTw);
 762                                         }
 763                                 &close_all_sockets();
 764                                 close(LISTEN);
 765
 766                                 print DEBUG
 767                                   "main: Starting handle_request loop pid=$$\n";
 768                                 while(&handle_request($acptaddr,
 769                                                       getsockname(SOCK))) { }
 770                                 print DEBUG
 771                                   "main: Done handle_request loop pid=$$\n";
 772                                 shutdown(SOCK, 1);
 773                                 close(SOCK);
 774                                 close($PASSINw); close($PASSOUTw);
 775                                 exit;
 776                                 }
 777                         push(@childpids, $handpid);
 778                         if ($need_pipes) {
 779                                 close($PASSINw); close($PASSOUTr);
 780                                 push(@passin, $PASSINr);
 781                                 push(@passout, $PASSOUTw);
 782                                 }
 783                         close(SOCK);
 784                         }
 785                 $sn++;
 786                 }
 787
 788         if ($config{'listen'} && vec($rmask, fileno(LISTEN), 1)) {
 789                 # Got UDP packet from another webmin server
 790                 local $rcvbuf;
 791                 local $from = recv(LISTEN, $rcvbuf, 1024, 0);
 792                 next if (!$from);
 793                 local $fromip = inet_ntoa((unpack_sockaddr_in($from))[1]);
 794                 local $toip = inet_ntoa((unpack_sockaddr_in(
 795                                          getsockname(LISTEN)))[1]);
 796                 if ((!@deny || !&ip_match($fromip, $toip, @deny)) &&
 797                     (!@allow || &ip_match($fromip, $toip, @allow))) {
 798                         local $listenhost = &get_socket_name(LISTEN);
 799                         send(LISTEN, "$listenhost:$config{'port'}:".
 800                                   ($use_ssl || $config{'inetd_ssl'} ? 1 : 0).":".
 801                                   ($config{'listenhost'} ?
 802                                         &get_system_hostname() : ""),
 803                                   0, $from)
 804                                 if ($listenhost);
 805                         }
 806                 }
 807
 808         # check for session, password-timeout and PAM messages from subprocesses
 809         for($i=0; $i<@passin; $i++) {
 810                 if (vec($rmask, fileno($passin[$i]), 1)) {
 811                         # this sub-process is asking about a password
 812                         local $infd = $passin[$i];
 813                         local $outfd = $passout[$i];
 814                         #local $inline = <$infd>;
 815                         local $inline = &sysread_line($infd);
 816                         if ($inline) {
 817                                 print DEBUG "main: inline $inline";
 818                                 }
 819                         else {
 820                                 print DEBUG "main: inline EOF\n";
 821                                 }
 822                         if ($inline =~ /^delay\s+(\S+)\s+(\S+)\s+(\d+)/) {
 823                                 # Got a delay request from a subprocess.. for
 824                                 # valid logins, there is no delay (to prevent
 825                                 # denial of service attacks), but for invalid
 826                                 # logins the delay increases with each failed
 827                                 # attempt.
 828                                 if ($3) {
 829                                         # login OK.. no delay
 830                                         print $outfd "0 0\n";
 831                                         $wasblocked = $hostfail{$2} ||
 832                                                       $userfail{$1};
 833                                         $hostfail{$2} = 0;
 834                                         $userfail{$1} = 0;
 835                                         if ($wasblocked) {
 836                                                 &write_blocked_file();
 837                                                 }
 838                                         }
 839                                 else {
 840                                         # login failed..
 841                                         $hostfail{$2}++;
 842                                         $userfail{$1}++;
 843                                         $blocked = 0;
 844
 845                                         # add the host to the block list,
 846                                         # if configured
 847                                         if ($config{'blockhost_failures'} &&
 848                                             $hostfail{$2} >=
 849                                               $config{'blockhost_failures'}) {
 850                                                 push(@deny, $2);
 851                                                 $blockhosttime{$2} = $time_now;
 852                                                 $blocked = 1;
 853                                                 if ($use_syslog) {
 854                                                         local $logtext = "Security alert: Host $2 blocked after $config{'blockhost_failures'} failed logins for user $1";
 855                                                         syslog("crit", "%s",
 856                                                                 $logtext);
 857                                                         }
 858                                                 }
 859
 860                                         # add the user to the user block list,
 861                                         # if configured
 862                                         if ($config{'blockuser_failures'} &&
 863                                             $userfail{$1} >=
 864                                               $config{'blockuser_failures'}) {
 865                                                 push(@denyusers, $1);
 866                                                 $blockusertime{$1} = $time_now;
 867                                                 $blocked = 2;
 868                                                 if ($use_syslog) {
 869                                                         local $logtext = "Security alert: User $1 blocked after $config{'blockuser_failures'} failed logins";
 870                                                         syslog("crit", "%s",
 871                                                                 $logtext);
 872                                                         }
 873                                                 }
 874
 875                                         # Lock out the user's password, if enabled
 876                                         if ($config{'blocklock'} &&
 877                                             $userfail{$1} >=
 878                                               $config{'blockuser_failures'}) {
 879                                                 my $lk = &lock_user_password($1);
 880                                                 $blocked = 2;
 881                                                 if ($use_syslog) {
 882                                                         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";
 883                                                         syslog("crit", "%s",
 884                                                                 $logtext);
 885                                                         }
 886                                                 }
 887
 888                                         # Send back a delay
 889                                         $dl = $userdlay{$1} -
 890                                            int(($time_now - $userlast{$1})/50);
 891                                         $dl = $dl < 0 ? 0 : $dl+1;
 892                                         print $outfd "$dl $blocked\n";
 893                                         $userdlay{$1} = $dl;
 894
 895                                         # Write out blocked status file
 896                                         if ($blocked) {
 897                                                 &write_blocked_file();
 898                                                 }
 899                                         }
 900                                 $userlast{$1} = $time_now;
 901                                 }
 902                         elsif ($inline =~ /^verify\s+(\S+)\s+(\S+)/) {
 903                                 # Verifying a session ID
 904                                 local $session_id = $1;
 905                                 local $notimeout = $2;
 906                                 local $skey = $sessiondb{$session_id} ?
 907                                                 $session_id :
 908                                                 &hash_session_id($session_id);
 909                                 if (!defined($sessiondb{$skey})) {
 910                                         # Session doesn't exist
 911                                         print $outfd "0 0\n";
 912                                         }
 913                                 else {
 914                                         local ($user, $ltime) =
 915                                           split(/\s+/, $sessiondb{$skey});
 916                                         local $lot = &get_logout_time($user, $session_id);
 917                                         if ($lot &&
 918                                             $time_now - $ltime > $lot*60 &&
 919                                             !$notimeout) {
 920                                                 # Session has timed out
 921                                                 print $outfd "1 ",$time_now - $ltime,"\n";
 922                                                 #delete($sessiondb{$skey});
 923                                                 }
 924                                         else {
 925                                                 # Session is OK
 926                                                 print $outfd "2 $user\n";
 927                                                 if ($lot &&
 928                                                     $time_now - $ltime >
 929                                                     ($lot*60)/2) {
 930                                                         $sessiondb{$skey} = "$user $time_now";
 931                                                         }
 932                                                 }
 933                                         }
 934                                 }
 935                         elsif ($inline =~ /^new\s+(\S+)\s+(\S+)\s+(\S+)/) {
 936                                 # Creating a new session
 937                                 local $session_id = $1;
 938                                 local $user = $2;
 939                                 local $ip = $3;
 940                                 $sessiondb{&hash_session_id($session_id)} =
 941                                         "$user $time_now $ip";
 942                                 }
 943                         elsif ($inline =~ /^delete\s+(\S+)/) {
 944                                 # Logging out a session
 945                                 local $session_id = $1;
 946                                 local $skey = $sessiondb{$session_id} ?
 947                                                 $session_id :
 948                                                 &hash_session_id($session_id);
 949                                 local @sdb = split(/\s+/, $sessiondb{$skey});
 950                                 print $outfd $sdb[0],"\n";
 951                                 delete($sessiondb{$skey});
 952                                 }
 953                         elsif ($inline =~ /^pamstart\s+(\S+)\s+(\S+)\s+(.*)/) {
 954                                 # Starting a new PAM conversation
 955                                 local ($cid, $host, $user) = ($1, $2, $3);
 956
 957                                 # Does this user even need PAM?
 958                                 local ($realuser, $canlogin) =
 959                                         &can_user_login($user, undef, $host);
 960                                 local $conv;
 961                                 if ($canlogin == 0) {
 962                                         # Cannot even login!
 963                                         print $outfd "0 Invalid username\n";
 964                                         }
 965                                 elsif ($canlogin != 2) {
 966                                         # Not using PAM .. so just ask for
 967                                         # the password.
 968                                         $conv = { 'user' => $realuser,
 969                                                   'host' => $host,
 970                                                   'step' => 0,
 971                                                   'cid' => $cid,
 972                                                   'time' => time() };
 973                                         print $outfd "3 Password\n";
 974                                         }
 975                                 else {
 976                                         # Start the PAM conversation
 977                                         # sub-process, and get a question
 978                                         $conv = { 'user' => $realuser,
 979                                                   'host' => $host,
 980                                                   'cid' => $cid,
 981                                                   'time' => time() };
 982                                         local ($PAMINr, $PAMINw, $PAMOUTr,
 983                                                 $PAMOUTw) = &allocate_pipes();
 984                                         local $pampid = fork();
 985                                         if (!$pampid) {
 986                                                 close($PAMOUTr); close($PAMINw);
 987                                                 &pam_conversation_process(
 988                                                         $realuser,
 989                                                         $PAMOUTw, $PAMINr);
 990                                                 }
 991                                         close($PAMOUTw); close($PAMINr);
 992                                         $conv->{'pid'} = $pampid;
 993                                         $conv->{'PAMOUTr'} = $PAMOUTr;
 994                                         $conv->{'PAMINw'} = $PAMINw;
 995                                         push(@childpids, $pampid);
 996
 997                                         # Get the first PAM question
 998                                         local $pok = &recv_pam_question(
 999                                                 $conv, $outfd);
1000                                         if (!$pok) {
1001                                                 &end_pam_conversation($conv);
1002                                                 }
1003                                         }
1004
1005                                 $conversations{$cid} = $conv if ($conv);
1006                                 }
1007                         elsif ($inline =~ /^pamanswer\s+(\S+)\s+(.*)/) {
1008                                 # A response to a PAM question
1009                                 local ($cid, $answer) = ($1, $2);
1010                                 local $conv = $conversations{$cid};
1011                                 if (!$conv) {
1012                                         # No such conversation?
1013                                         print $outfd "0 Bad login session\n";
1014                                         }
1015                                 elsif ($conv->{'pid'}) {
1016                                         # Send the PAM response and get
1017                                         # the next question
1018                                         &send_pam_answer($conv, $answer);
1019                                         local $pok = &recv_pam_question($conv, $outfd);
1020                                         if (!$pok) {
1021                                                 &end_pam_conversation($conv);
1022                                                 }
1023                                         }
1024                                 else {
1025                                         # This must be the password .. try it
1026                                         # and send back the results
1027                                         local ($vu, $expired, $nonexist) =
1028                                                 &validate_user($conv->{'user'},
1029                                                                $answer,
1030                                                                $conf->{'host'});
1031                                         local $ok = $vu ? 1 : 0;
1032                                         print $outfd "2 $conv->{'user'} $ok $expired $notexist\n";
1033                                         &end_pam_conversation($conv);
1034                                         }
1035                                 }
1036                         elsif ($inline =~ /^writesudo\s+(\S+)\s+(\d+)/) {
1037                                 # Store the fact that some user can sudo to root
1038                                 local ($user, $ok) = ($1, $2);
1039                                 $sudocache{$user} = $ok." ".time();
1040                                 }
1041                         elsif ($inline =~ /^readsudo\s+(\S+)/) {
1042                                 # Query the user sudo cache (valid for 1 minute)
1043                                 local $user = $1;
1044                                 local ($ok, $last) =
1045                                         split(/\s+/, $sudocache{$user});
1046                                 if ($last < time()-60) {
1047                                         # Cache too old
1048                                         print $outfd "2\n";
1049                                         }
1050                                 else {
1051                                         # Tell client OK or not
1052                                         print $outfd "$ok\n";
1053                                         }
1054                                 }
1055                         elsif ($inline =~ /\S/) {
1056                                 # Unknown line from pipe?
1057                                 print DEBUG "main: Unknown line from pipe $inline\n";
1058                                 print STDERR "Unknown line from pipe $inline\n";
1059                                 }
1060                         else {
1061                                 # close pipe
1062                                 close($infd); close($outfd);
1063                                 $passin[$i] = $passout[$i] = undef;
1064                                 }
1065                         }
1066                 }
1067         @passin = grep { defined($_) } @passin;
1068         @passout = grep { defined($_) } @passout;
1069         }
1070
1071 # handle_request(remoteaddress, localaddress)
1072 # Where the real work is done
1073 sub handle_request
1074 {
1075 $acptip = inet_ntoa((unpack_sockaddr_in($_[0]))[1]);
1076 $localip = $_[1] ? inet_ntoa((unpack_sockaddr_in($_[1]))[1]) : undef;
1077 print DEBUG "handle_request: from $acptip to $localip\n";
1078 if ($config{'loghost'}) {
1079         $acpthost = gethostbyaddr(inet_aton($acptip), AF_INET);
1080         $acpthost = $acptip if (!$acpthost);
1081         }
1082 else {
1083         $acpthost = $acptip;
1084         }
1085 $datestr = &http_date(time());
1086 $ok_code = 200;
1087 $ok_message = "Document follows";
1088 $logged_code = undef;
1089 $reqline = $request_uri = $page = undef;
1090 $authuser = undef;
1091 $validated = undef;
1092
1093 # check address against access list
1094 if (@deny && &ip_match($acptip, $localip, @deny) ||
1095     @allow && !&ip_match($acptip, $localip, @allow)) {
1096         &http_error(403, "Access denied for $acptip");
1097         return 0;
1098         }
1099
1100 if ($use_libwrap) {
1101         # Check address with TCP-wrappers
1102         if (!hosts_ctl($config{'pam'}, STRING_UNKNOWN,
1103                        $acptip, STRING_UNKNOWN)) {
1104                 &http_error(403, "Access denied for $acptip by TCP wrappers");
1105                 return 0;
1106                 }
1107         }
1108 print DEBUG "handle_request: passed IP checks\n";
1109
1110 # Compute a timeout for the start of headers, based on the number of
1111 # child processes. As this increases, we use a shorter timeout to avoid
1112 # an attacker overloading the system.
1113 local $header_timeout = 60 + ($config{'maxconns'} - @childpids) * 10;
1114
1115 # Wait at most 60 secs for start of headers for initial requests, or
1116 # 10 minutes for kept-alive connections
1117 local $rmask;
1118 vec($rmask, fileno(SOCK), 1) = 1;
1119 local $to = $checked_timeout ? 10*60 : $header_timeout;
1120 local $sel = select($rmask, undef, undef, $to);
1121 if (!$sel) {
1122         if ($checked_timeout) {
1123                 print DEBUG "handle_request: exiting due to timeout of $to\n";
1124                 exit;
1125                 }
1126         else {
1127                 &http_error(400, "Timeout",
1128                             "Waited for that $to seconds for start of headers");
1129                 }
1130         }
1131 $checked_timeout++;
1132 print DEBUG "handle_request: passed timeout check\n";
1133
1134 # Read the HTTP request and headers
1135 local $origreqline = &read_line();
1136 ($reqline = $origreqline) =~ s/\r|\n//g;
1137 $method = $page = $request_uri = undef;
1138 print DEBUG "handle_request reqline=$reqline\n";
1139 if (!$reqline && (!$use_ssl || $checked_timeout > 1)) {
1140         # An empty request .. just close the connection
1141         print DEBUG "handle_request: rejecting empty request\n";
1142         return 0;
1143         }
1144 elsif ($reqline !~ /^(\S+)\s+(.*)\s+HTTP\/1\..$/) {
1145         print DEBUG "handle_request: invalid reqline=$reqline\n";
1146         if ($use_ssl) {
1147                 # This could be an http request when it should be https
1148                 $use_ssl = 0;
1149                 local $url = $config{'musthost'} ?
1150                                 "https://$config{'musthost'}:$port/" :
1151                                 "https://$host:$port/";
1152                 if ($config{'ssl_redirect'}) {
1153                         # Just re-direct to the correct URL
1154                         sleep(1);       # Give browser a change to finish
1155                                         # sending its request
1156                         &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
1157                         &write_data("Date: $datestr\r\n");
1158                         &write_data("Server: $config{'server'}\r\n");
1159                         &write_data("Location: $url\r\n");
1160                         &write_keep_alive(0);
1161                         &write_data("\r\n");
1162                         return 0;
1163                         }
1164                 else {
1165                         # Tell user the correct URL
1166                         &http_error(200, "Bad Request", "This web server is running in SSL mode. Try the URL <a href='$url'>$url</a> instead.<br>");
1167                         }
1168                 }
1169         elsif (ord(substr($reqline, 0, 1)) == 128 && !$use_ssl) {
1170                 # This could be an https request when it should be http ..
1171                 # need to fake a HTTP response
1172                 eval <<'EOF';
1173                         use Net::SSLeay;
1174                         eval "Net::SSLeay::SSLeay_add_ssl_algorithms()";
1175                         eval "Net::SSLeay::load_error_strings()";
1176                         $ssl_ctx = Net::SSLeay::CTX_new();
1177                         Net::SSLeay::CTX_use_RSAPrivateKey_file(
1178                                 $ssl_ctx, $config{'keyfile'},
1179                                 &Net::SSLeay::FILETYPE_PEM);
1180                         Net::SSLeay::CTX_use_certificate_file(
1181                                 $ssl_ctx,
1182                                 $config{'certfile'} || $config{'keyfile'},
1183                                 &Net::SSLeay::FILETYPE_PEM);
1184                         $ssl_con = Net::SSLeay::new($ssl_ctx);
1185                         pipe(SSLr, SSLw);
1186                         if (!fork()) {
1187                                 close(SSLr);
1188                                 select(SSLw); $| = 1; select(STDOUT);
1189                                 print SSLw $origreqline;
1190                                 local $buf;
1191                                 while(sysread(SOCK, $buf, 1) > 0) {
1192                                         print SSLw $buf;
1193                                         }
1194                                 close(SOCK);
1195                                 exit;
1196                                 }
1197                         close(SSLw);
1198                         Net::SSLeay::set_wfd($ssl_con, fileno(SOCK));
1199                         Net::SSLeay::set_rfd($ssl_con, fileno(SSLr));
1200                         Net::SSLeay::accept($ssl_con) || die "accept() failed";
1201                         $use_ssl = 1;
1202                         local $url = $config{'musthost'} ?
1203                                         "https://$config{'musthost'}:$port/" :
1204                                         "https://$host:$port/";
1205                         if ($config{'ssl_redirect'}) {
1206                                 # Just re-direct to the correct URL
1207                                 sleep(1);       # Give browser a change to
1208                                                 # finish sending its request
1209                                 &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
1210                                 &write_data("Date: $datestr\r\n");
1211                                 &write_data("Server: $config{'server'}\r\n");
1212                                 &write_data("Location: $url\r\n");
1213                                 &write_keep_alive(0);
1214                                 &write_data("\r\n");
1215                                 return 0;
1216                                 }
1217                         else {
1218                                 # Tell user the correct URL
1219                                 &http_error(200, "Bad Request", "This web server is not running in SSL mode. Try the URL <a href='$url'>$url</a> instead.<br>");
1220                                 }
1221 EOF
1222                 if ($@) {
1223                         &http_error(400, "Bad Request");
1224                         }
1225                 }
1226         else {
1227                 &http_error(400, "Bad Request");
1228                 }
1229         }
1230 $method = $1;
1231 $request_uri = $page = $2;
1232 %header = ();
1233 local $lastheader;
1234 while(1) {
1235         ($headline = &read_line()) =~ s/\r|\n//g;
1236         last if ($headline eq "");
1237         print DEBUG "handle_request: got headline $headline\n";
1238         if ($headline =~ /^(\S+):\s*(.*)$/) {
1239                 $header{$lastheader = lc($1)} = $2;
1240                 }
1241         elsif ($headline =~ /^\s+(.*)$/) {
1242                 $header{$lastheader} .= $headline;
1243                 }
1244         else {
1245                 &http_error(400, "Bad Header $headline");
1246                 }
1247         }
1248 if (defined($header{'host'})) {
1249         if ($header{'host'} =~ /^([^:]+):([0-9]+)$/) {
1250                 ($host, $port) = ($1, $2);
1251                 }
1252         else {
1253                 $host = $header{'host'};
1254                 }
1255         if ($config{'musthost'} && $host ne $config{'musthost'}) {
1256                 # Disallowed hostname used
1257                 &http_error(400, "Invalid HTTP hostname");
1258                 }
1259         }
1260 undef(%in);
1261 if ($page =~ /^([^\?]+)\?(.*)$/) {
1262         # There is some query string information
1263         $page = $1;
1264         $querystring = $2;
1265         print DEBUG "handle_request: querystring=$querystring\n";
1266         if ($querystring !~ /=/) {
1267                 $queryargs = $querystring;
1268                 $queryargs =~ s/\+/ /g;
1269                 $queryargs =~ s/%(..)/pack("c",hex($1))/ge;
1270                 $querystring = "";
1271                 }
1272         else {
1273                 # Parse query-string parameters
1274                 local @in = split(/\&/, $querystring);
1275                 foreach $i (@in) {
1276                         local ($k, $v) = split(/=/, $i, 2);
1277                         $k =~ s/\+/ /g; $k =~ s/%(..)/pack("c",hex($1))/ge;
1278                         $v =~ s/\+/ /g; $v =~ s/%(..)/pack("c",hex($1))/ge;
1279                         $in{$k} = $v;
1280                         }
1281                 }
1282         }
1283 $posted_data = undef;
1284 if ($method eq 'POST' &&
1285     $header{'content-type'} eq 'application/x-www-form-urlencoded') {
1286         # Read in posted query string information, up the configured maximum
1287         # post request length
1288         $clen = $header{"content-length"};
1289         $clen_read = $clen > $config{'max_post'} ? $config{'max_post'} : $clen;
1290         while(length($posted_data) < $clen_read) {
1291                 $buf = &read_data($clen_read - length($posted_data));
1292                 if (!length($buf)) {
1293                         &http_error(500, "Failed to read POST request");
1294                         }
1295                 chomp($posted_data);
1296                 $posted_data =~ s/\015$//mg;
1297                 $posted_data .= $buf;
1298                 }
1299         print DEBUG "clen_read=$clen_read clen=$clen posted_data=",length($posted_data),"\n";
1300         if ($clen_read != $clen && length($posted_data) > $clen) {
1301                 # If the client sent more data than we asked for, chop the
1302                 # rest off
1303                 $posted_data = substr($posted_data, 0, $clen);
1304                 }
1305         if (length($posted_data) > $clen) {
1306                 # When the client sent too much, delay so that it gets headers
1307                 sleep(3);
1308                 }
1309         if ($header{'user-agent'} =~ /MSIE/ &&
1310             $header{'user-agent'} !~ /Opera/i) {
1311                 # MSIE includes an extra newline in the data
1312                 $posted_data =~ s/\r|\n//g;
1313                 }
1314         local @in = split(/\&/, $posted_data);
1315         foreach $i (@in) {
1316                 local ($k, $v) = split(/=/, $i, 2);
1317                 #$v =~ s/\r|\n//g;
1318                 $k =~ s/\+/ /g; $k =~ s/%(..)/pack("c",hex($1))/ge;
1319                 $v =~ s/\+/ /g; $v =~ s/%(..)/pack("c",hex($1))/ge;
1320                 $in{$k} = $v;
1321                 }
1322         print DEBUG "handle_request: posted_data=$posted_data\n";
1323         }
1324
1325 # replace %XX sequences in page
1326 $page =~ s/%(..)/pack("c",hex($1))/ge;
1327
1328 # Check if the browser's user agent indicates a mobile device
1329 $mobile_device = &is_mobile_useragent($header{'user-agent'});
1330
1331 # Check if Host: header is for a mobile URL
1332 foreach my $m (@mobile_prefixes) {
1333         if ($header{'host'} =~ /^\Q$m\E/i) {
1334                 $mobile_device = 1;
1335                 }
1336         }
1337
1338 # check for the logout flag file, and if existant deny authentication
1339 if ($config{'logout'} && -r $config{'logout'}.$in{'miniserv_logout_id'}) {
1340         print DEBUG "handle_request: logout flag set\n";
1341         $deny_authentication++;
1342         open(LOGOUT, $config{'logout'}.$in{'miniserv_logout_id'});
1343         chop($count = <LOGOUT>);
1344         close(LOGOUT);
1345         $count--;
1346         if ($count > 0) {
1347                 open(LOGOUT, ">$config{'logout'}$in{'miniserv_logout_id'}");
1348                 print LOGOUT "$count\n";
1349                 close(LOGOUT);
1350                 }
1351         else {
1352                 unlink($config{'logout'}.$in{'miniserv_logout_id'});
1353                 }
1354         }
1355
1356 # check for any redirect for the requested URL
1357 foreach my $pfx (@strip_prefix) {
1358         my $l = length($pfx);
1359         if(length($page) >= $l &&
1360            substr($page,0,$l) eq $pfx) {
1361                 $page=substr($page,$l);
1362                 last;
1363                 }
1364         }
1365 $simple = &simplify_path($page, $bogus);
1366 $rpath = $simple;
1367 $rpath .= "&".$querystring if (defined($querystring));
1368 $redir = $redirect{$rpath};
1369 if (defined($redir)) {
1370         print DEBUG "handle_request: redir=$redir\n";
1371         &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
1372         &write_data("Date: $datestr\r\n");
1373         &write_data("Server: $config{'server'}\r\n");
1374         local $ssl = $use_ssl || $config{'inetd_ssl'};
1375         $portstr = $port == 80 && !$ssl ? "" :
1376                    $port == 443 && $ssl ? "" : ":$port";
1377         $prot = $ssl ? "https" : "http";
1378         &write_data("Location: $prot://$host$portstr$redir\r\n");
1379         &write_keep_alive(0);
1380         &write_data("\r\n");
1381         return 0;
1382         }
1383
1384 # Check for a DAV request
1385 $davpath = undef;
1386 foreach my $d (@davpaths) {
1387         if ($simple eq $d || $simple =~ /^\Q$d\E\//) {
1388                 $davpath = $d;
1389                 last;
1390                 }
1391         }
1392 if (!$davpath && ($method eq "SEARCH" || $method eq "PUT")) {
1393         &http_error(400, "Bad Request method $method");
1394         }
1395
1396 # Check for password if needed
1397 if ($config{'userfile'}) {
1398         print DEBUG "handle_request: Need authentication\n";
1399         $validated = 0;
1400         $blocked = 0;
1401
1402         # Session authentication is never used for connections by
1403         # another webmin server, or for specified pages, or for DAV, or XMLRPC,
1404         # or mobile browsers if requested.
1405         if ($header{'user-agent'} =~ /webmin/i ||
1406             $header{'user-agent'} =~ /$config{'agents_nosession'}/i ||
1407             $sessiononly{$simple} || $davpath ||
1408             $simple eq "/xmlrpc.cgi" ||
1409             $acptip eq $config{'host_nosession'} ||
1410             $mobile_device && $config{'mobile_nosession'}) {
1411                 print DEBUG "handle_request: Forcing HTTP authentication\n";
1412                 $config{'session'} = 0;
1413                 }
1414
1415         # Check for SSL authentication
1416         if ($use_ssl && $verified_client) {
1417                 $peername = Net::SSLeay::X509_NAME_oneline(
1418                                 Net::SSLeay::X509_get_subject_name(
1419                                         Net::SSLeay::get_peer_certificate(
1420                                                 $ssl_con)));
1421                 $u = &find_user_by_cert($peername);
1422                 if ($u) {
1423                         $authuser = $u;
1424                         $validated = 2;
1425                         }
1426                 if ($use_syslog && !$validated) {
1427                         syslog("crit", "%s",
1428                                "Unknown SSL certificate $peername");
1429                         }
1430                 }
1431
1432         if (!$validated && !$deny_authentication) {
1433                 # check for IP-based authentication
1434                 local $a;
1435                 foreach $a (keys %ipaccess) {
1436                         if ($acptip eq $a) {
1437                                 # It does! Auth as the user
1438                                 $validated = 3;
1439                                 $baseauthuser = $authuser =
1440                                         $ipaccess{$a};
1441                                 }
1442                         }
1443                 }
1444
1445         # Check for normal HTTP authentication
1446         if (!$validated && !$deny_authentication && !$config{'session'} &&
1447             $header{authorization} =~ /^basic\s+(\S+)$/i) {
1448                 # authorization given..
1449                 ($authuser, $authpass) = split(/:/, &b64decode($1), 2);
1450                 print DEBUG "handle_request: doing basic auth check authuser=$authuser authpass=$authpass\n";
1451                 local ($vu, $expired, $nonexist) =
1452                         &validate_user($authuser, $authpass, $host);
1453                 print DEBUG "handle_request: vu=$vu expired=$expired nonexist=$nonexist\n";
1454                 if ($vu && (!$expired || $config{'passwd_mode'} == 1)) {
1455                         $authuser = $vu;
1456                         $validated = 1;
1457                         }
1458                 else {
1459                         $validated = 0;
1460                         }
1461                 if ($use_syslog && !$validated) {
1462                         syslog("crit", "%s",
1463                                ($nonexist ? "Non-existent" :
1464                                 $expired ? "Expired" : "Invalid").
1465                                " login as $authuser from $acpthost");
1466                         }
1467                 if ($authuser =~ /\r|\n|\s/) {
1468                         &http_error(500, "Invalid username",
1469                                     "Username contains invalid characters");
1470                         }
1471                 if ($authpass =~ /\r|\n/) {
1472                         &http_error(500, "Invalid password",
1473                                     "Password contains invalid characters");
1474                         }
1475
1476                 if ($config{'passdelay'} && !$config{'inetd'} && $authuser) {
1477                         # check with main process for delay
1478                         print DEBUG "handle_request: about to ask for password delay\n";
1479                         print $PASSINw "delay $authuser $acptip $validated\n";
1480                         <$PASSOUTr> =~ /(\d+) (\d+)/;
1481                         $blocked = $2;
1482                         print DEBUG "handle_request: password delay $1 $2\n";
1483                         sleep($1);
1484                         }
1485                 }
1486
1487         # Check for a visit to the special session login page
1488         if ($config{'session'} && !$deny_authentication &&
1489             $page eq $config{'session_login'}) {
1490                 if ($in{'logout'} && $header{'cookie'} =~ /(^|\s)$sidname=([a-f0-9]+)/) {
1491                         # Logout clicked .. remove the session
1492                         local $sid = $2;
1493                         print $PASSINw "delete $sid\n";
1494                         local $louser = <$PASSOUTr>;
1495                         chop($louser);
1496                         $logout = 1;
1497                         $already_session_id = undef;
1498                         $authuser = $baseauthuser = undef;
1499                         if ($louser) {
1500                                 if ($use_syslog) {
1501                                         syslog("info", "%s", "Logout by $louser from $acpthost");
1502                                         }
1503                                 &run_logout_script($louser, $sid,
1504                                                    $acptip, $localip);
1505                                 &write_logout_utmp($louser, $actphost);
1506                                 }
1507                         }
1508                 else {
1509                         # Validate the user
1510                         if ($in{'user'} =~ /\r|\n|\s/) {
1511                                 &http_error(500, "Invalid username",
1512                                     "Username contains invalid characters");
1513                                 }
1514                         if ($in{'pass'} =~ /\r|\n/) {
1515                                 &http_error(500, "Invalid password",
1516                                     "Password contains invalid characters");
1517                                 }
1518
1519                         local ($vu, $expired, $nonexist) =
1520                                 &validate_user($in{'user'}, $in{'pass'}, $host);
1521                         local $hrv = &handle_login(
1522                                         $vu || $in{'user'}, $vu ? 1 : 0,
1523                                         $expired, $nonexist, $in{'pass'},
1524                                         $in{'notestingcookie'});
1525                         return $hrv if (defined($hrv));
1526                         }
1527                 }
1528
1529         # Check for a visit to the special PAM login page
1530         if ($config{'session'} && !$deny_authentication &&
1531             $use_pam && $config{'pam_conv'} && $page eq $config{'pam_login'} &&
1532             !$in{'restart'}) {
1533                 # A question has been entered .. submit it to the main process
1534                 print DEBUG "handle_request: Got call to $page ($in{'cid'})\n";
1535                 print DEBUG "handle_request: For PAM, authuser=$authuser\n";
1536                 if ($in{'answer'} =~ /\r|\n/ || $in{'cid'} =~ /\r|\n|\s/) {
1537                         &http_error(500, "Invalid response",
1538                             "Response contains invalid characters");
1539                         }
1540
1541                 if (!$in{'cid'}) {
1542                         # Start of a new conversation - answer must be username
1543                         $cid = &generate_random_id($in{'answer'});
1544                         print $PASSINw "pamstart $cid $host $in{'answer'}\n";
1545                         }
1546                 else {
1547                         # A response to a previous question
1548                         $cid = $in{'cid'};
1549                         print $PASSINw "pamanswer $cid $in{'answer'}\n";
1550                         }
1551
1552                 # Read back the response, and the next question (if any)
1553                 local $line = <$PASSOUTr>;
1554                 $line =~ s/\r|\n//g;
1555                 local ($rv, $question) = split(/\s+/, $line, 2);
1556                 if ($rv == 0) {
1557                         # Cannot login!
1558                         local $hrv = &handle_login(
1559                                 !$in{'cid'} && $in{'answer'} ? $in{'answer'}
1560                                                              : "unknown",
1561                                 0, 0, 1, undef);
1562                         return $hrv if (defined($hrv));
1563                         }
1564                 elsif ($rv == 1 || $rv == 3) {
1565                         # Another question .. force use of PAM CGI
1566                         $validated = 1;
1567                         $method = "GET";
1568                         $querystring .= "&cid=$cid&question=".
1569                                         &urlize($question);
1570                         $querystring .= "&password=1" if ($rv == 3);
1571                         $queryargs = "";
1572                         $page = $config{'pam_login'};
1573                         $miniserv_internal = 1;
1574                         $logged_code = 401;
1575                         }
1576                 elsif ($rv == 2) {
1577                         # Got back a final ok or failure
1578                         local ($user, $ok, $expired, $nonexist) =
1579                                 split(/\s+/, $question);
1580                         local $hrv = &handle_login(
1581                                 $user, $ok, $expired, $nonexist, undef,
1582                                 $in{'notestingcookie'});
1583                         return $hrv if (defined($hrv));
1584                         }
1585                 elsif ($rv == 4) {
1586                         # A message from PAM .. tell the user
1587                         $validated = 1;
1588                         $method = "GET";
1589                         $querystring .= "&cid=$cid&message=".
1590                                         &urlize($question);
1591                         $queryargs = "";
1592                         $page = $config{'pam_login'};
1593                         $miniserv_internal = 1;
1594                         $logged_code = 401;
1595                         }
1596                 }
1597
1598         # Check for a visit to the special password change page
1599         if ($config{'session'} && !$deny_authentication &&
1600             $page eq $config{'password_change'} && !$validated) {
1601                 # Just let this slide ..
1602                 $validated = 1;
1603                 $miniserv_internal = 3;
1604                 }
1605
1606         # Check for an existing session
1607         if ($config{'session'} && !$validated) {
1608                 if ($already_session_id) {
1609                         $session_id = $already_session_id;
1610                         $authuser = $already_authuser;
1611                         $validated = 1;
1612                         }
1613                 elsif (!$deny_authentication &&
1614                        $header{'cookie'} =~ /(^|\s)$sidname=([a-f0-9]+)/) {
1615                         # Try all session cookies
1616                         local $cookie = $header{'cookie'};
1617                         while($cookie =~ s/(^|\s)$sidname=([a-f0-9]+)//) {
1618                                 $session_id = $2;
1619                                 local $notimeout =
1620                                         $in{'webmin_notimeout'} ? 1 : 0;
1621                                 print $PASSINw "verify $session_id $notimeout\n";
1622                                 <$PASSOUTr> =~ /(\d+)\s+(\S+)/;
1623                                 if ($1 == 2) {
1624                                         # Valid session continuation
1625                                         $validated = 1;
1626                                         $authuser = $2;
1627                                         $already_authuser = $authuser;
1628                                         $timed_out = undef;
1629                                         last;
1630                                         }
1631                                 elsif ($1 == 1) {
1632                                         # Session timed out
1633                                         $timed_out = $2;
1634                                         }
1635                                 else {
1636                                         # Invalid session ID .. don't set
1637                                         # verified flag
1638                                         }
1639                                 }
1640                         }
1641                 }
1642
1643         # Check for local authentication
1644         if ($localauth_user && !$header{'x-forwarded-for'} && !$header{'via'}) {
1645                 my $luser = &get_user_details($localauth_user);
1646                 if ($luser) {
1647                         # Local user exists in webmin users file
1648                         $validated = 1;
1649                         $authuser = $localauth_user;
1650                         }
1651                 else {
1652                         # Check if local user is allowed by unixauth
1653                         local @can = &can_user_login($localauth_user,
1654                                                      undef, $host);
1655                         if ($can[0]) {
1656                                 $validated = 2;
1657                                 $authuser = $localauth_user;
1658                                 }
1659                         else {
1660                                 $localauth_user = undef;
1661                                 }
1662                         }
1663                 }
1664
1665         if (!$validated) {
1666                 # Check if this path allows anonymous access
1667                 local $a;
1668                 foreach $a (keys %anonymous) {
1669                         if (substr($simple, 0, length($a)) eq $a) {
1670                                 # It does! Auth as the user, if IP access
1671                                 # control allows him.
1672                                 if (&check_user_ip($anonymous{$a}) &&
1673                                     &check_user_time($anonymous{$a})) {
1674                                         $validated = 3;
1675                                         $baseauthuser = $authuser =
1676                                                 $anonymous{$a};
1677                                         }
1678                                 }
1679                         }
1680                 }
1681
1682         if (!$validated) {
1683                 # Check if this path allows unauthenticated access
1684                 local ($u, $unauth);
1685                 foreach $u (@unauth) {
1686                         $unauth++ if ($simple =~ /$u/);
1687                         }
1688                 if (!$bogus && $unauth) {
1689                         # Unauthenticated directory or file request - approve it
1690                         $validated = 4;
1691                         $baseauthuser = $authuser = undef;
1692                         }
1693                 }
1694
1695         if (!$validated) {
1696                 if ($blocked == 0) {
1697                         # No password given.. ask
1698                         if ($config{'pam_conv'} && $use_pam) {
1699                                 # Force CGI for PAM question, starting with
1700                                 # the username which is always needed
1701                                 $validated = 1;
1702                                 $method = "GET";
1703                                 $querystring .= "&initial=1&question=".
1704                                                 &urlize("Username");
1705                                 $querystring .= "&failed=$failed_user" if ($failed_user);
1706                                 $querystring .= "&timed_out=$timed_out" if ($timed_out);
1707                                 $queryargs = "";
1708                                 $page = $config{'pam_login'};
1709                                 $miniserv_internal = 1;
1710                                 $logged_code = 401;
1711                                 }
1712                         elsif ($config{'session'}) {
1713                                 # Force CGI for session login
1714                                 $validated = 1;
1715                                 if ($logout) {
1716                                         $querystring .= "&logout=1&page=/";
1717                                         }
1718                                 else {
1719                                         # Re-direct to current module only
1720                                         local $rpage = $request_uri;
1721                                         if (!$config{'loginkeeppage'}) {
1722                                                 $rpage =~ s/\?.*$//;
1723                                                 $rpage =~ s/[^\/]+$//
1724                                                 }
1725                                         $querystring = "page=".&urlize($rpage);
1726                                         }
1727                                 $method = "GET";
1728                                 $querystring .= "&failed=$failed_user" if ($failed_user);
1729                                 $querystring .= "&timed_out=$timed_out" if ($timed_out);
1730                                 $queryargs = "";
1731                                 $page = $config{'session_login'};
1732                                 $miniserv_internal = 1;
1733                                 $logged_code = 401;
1734                                 }
1735                         else {
1736                                 # Ask for login with HTTP authentication
1737                                 &write_data("HTTP/1.0 401 Unauthorized\r\n");
1738                                 &write_data("Date: $datestr\r\n");
1739                                 &write_data("Server: $config{'server'}\r\n");
1740                                 &write_data("WWW-authenticate: Basic ".
1741                                            "realm=\"$config{'realm'}\"\r\n");
1742                                 &write_keep_alive(0);
1743                                 &write_data("Content-type: text/html\r\n");
1744                                 &write_data("\r\n");
1745                                 &reset_byte_count();
1746                                 &write_data("<html>\n");
1747                                 &write_data("<head><title>Unauthorized</title></head>\n");
1748                                 &write_data("<body><h1>Unauthorized</h1>\n");
1749                                 &write_data("A password is required to access this\n");
1750                                 &write_data("web server. Please try again. <p>\n");
1751                                 &write_data("</body></html>\n");
1752                                 &log_request($acpthost, undef, $reqline, 401, &byte_count());
1753                                 return 0;
1754                                 }
1755                         }
1756                 elsif ($blocked == 1) {
1757                         # when the host has been blocked, give it an error
1758                         &http_error(403, "Access denied for $acptip. The host ".
1759                                          "has been blocked because of too ".
1760                                          "many authentication failures.");
1761                         }
1762                 elsif ($blocked == 2) {
1763                         # when the user has been blocked, give it an error
1764                         &http_error(403, "Access denied. The user ".
1765                                          "has been blocked because of too ".
1766                                          "many authentication failures.");
1767                         }
1768                 }
1769         else {
1770                 # Get the real Webmin username
1771                 local @can = &can_user_login($authuser, undef, $host);
1772                 $baseauthuser = $can[3] || $authuser;
1773
1774                 if ($config{'remoteuser'} && !$< && $validated) {
1775                         # Switch to the UID of the remote user (if he exists)
1776                         local @u = getpwnam($authuser);
1777                         if (@u && $< != $u[2]) {
1778                                 $( = $u[3]; $) = "$u[3] $u[3]";
1779                                 ($>, $<) = ($u[2], $u[2]);
1780                                 }
1781                         else {
1782                                 &http_error(500, "Unix user $authuser does not exist");
1783                                 return 0;
1784                                 }
1785                         }
1786                 }
1787
1788         # Check per-user IP access control
1789         if (!&check_user_ip($baseauthuser)) {
1790                 &http_error(403, "Access denied for $acptip for $baseauthuser");
1791                 return 0;
1792                 }
1793
1794         # Check per-user allowed times
1795         if (!&check_user_time($baseauthuser)) {
1796                 &http_error(403, "Access denied at the current time");
1797                 return 0;
1798                 }
1799         }
1800
1801 # Validate the path, and convert to canonical form
1802 rerun:
1803 $simple = &simplify_path($page, $bogus);
1804 print DEBUG "handle_request: page=$page simple=$simple\n";
1805 if ($bogus) {
1806         &http_error(400, "Invalid path");
1807         }
1808
1809 # Check for a DAV request
1810 if ($davpath) {
1811         return &handle_dav_request($davpath);
1812         }
1813
1814 # Work out the active theme(s)
1815 local $preroots = $mobile_device && defined($config{'mobile_preroot'}) ?
1816                         $config{'mobile_preroot'} :
1817                  $authuser && defined($config{'preroot_'.$authuser}) ?
1818                         $config{'preroot_'.$authuser} :
1819                  $authuser && $baseauthuser &&
1820                      defined($config{'preroot_'.$baseauthuser}) ?
1821                         $config{'preroot_'.$baseauthuser} :
1822                         $config{'preroot'};
1823 local @preroots = reverse(split(/\s+/, $preroots));
1824
1825 # Canonicalize the directories
1826 foreach my $preroot (@preroots) {
1827         # Always under the current webmin root
1828         $preroot =~ s/^.*\///g;
1829         $preroot = $roots[0].'/'.$preroot;
1830         }
1831
1832 # Look in the theme root directories first
1833 local ($full, @stfull);
1834 $foundroot = undef;
1835 foreach my $preroot (@preroots) {
1836         $is_directory = 1;
1837         $sofar = "";
1838         $full = $preroot.$sofar;
1839         $scriptname = $simple;
1840         foreach $b (split(/\//, $simple)) {
1841                 if ($b ne "") { $sofar .= "/$b"; }
1842                 $full = $preroot.$sofar;
1843                 @stfull = stat($full);
1844                 if (!@stfull) { undef($full); last; }
1845
1846                 # Check if this is a directory
1847                 if (-d _) {
1848                         # It is.. go on parsing
1849                         $is_directory = 1;
1850                         next;
1851                         }
1852                 else {
1853                         $is_directory = 0;
1854                         }
1855
1856                 # Check if this is a CGI program
1857                 if (&get_type($full) eq "internal/cgi") {
1858                         $pathinfo = substr($simple, length($sofar));
1859                         $pathinfo .= "/" if ($page =~ /\/$/);
1860                         $scriptname = $sofar;
1861                         last;
1862                         }
1863                 }
1864
1865         # Don't stop at a directory unless this is the last theme, which
1866         # is the 'real' one that provides the .cgi scripts
1867         if ($is_directory && $preroot ne $preroots[$#preroots]) {
1868                 next;
1869                 }
1870
1871         if ($full) {
1872                 # Found it!
1873                 if ($sofar eq '') {
1874                         $cgi_pwd = $roots[0];
1875                         }
1876                 elsif ($is_directory) {
1877                         $cgi_pwd = "$roots[0]$sofar";
1878                         }
1879                 else {
1880                         "$roots[0]$sofar" =~ /^(.*\/)[^\/]+$/;
1881                         $cgi_pwd = $1;
1882                         }
1883                 $foundroot = $preroot;
1884                 if ($is_directory) {
1885                         # Check for index files in the directory
1886                         local $foundidx;
1887                         foreach $idx (split(/\s+/, $config{"index_docs"})) {
1888                                 $idxfull = "$full/$idx";
1889                                 local @stidxfull = stat($idxfull);
1890                                 if (-r _ && !-d _) {
1891                                         $full = $idxfull;
1892                                         @stfull = @stidxfull;
1893                                         $is_directory = 0;
1894                                         $scriptname .= "/"
1895                                                 if ($scriptname ne "/");
1896                                         $foundidx++;
1897                                         last;
1898                                         }
1899                                 }
1900                         @stfull = stat($full) if (!$foundidx);
1901                         }
1902                 }
1903         last if ($foundroot);
1904         }
1905 print DEBUG "handle_request: initial full=$full\n";
1906
1907 # Look in the real root directories, stopping when we find a file or directory
1908 if (!$full || $is_directory) {
1909         ROOT: foreach $root (@roots) {
1910                 $sofar = "";
1911                 $full = $root.$sofar;
1912                 $scriptname = $simple;
1913                 foreach $b ($simple eq "/" ? ( "" ) : split(/\//, $simple)) {
1914                         if ($b ne "") { $sofar .= "/$b"; }
1915                         $full = $root.$sofar;
1916                         @stfull = stat($full);
1917                         if (!@stfull) {
1918                                 next ROOT;
1919                                 }
1920
1921                         # Check if this is a directory
1922                         if (-d _) {
1923                                 # It is.. go on parsing
1924                                 next;
1925                                 }
1926
1927                         # Check if this is a CGI program
1928                         if (&get_type($full) eq "internal/cgi") {
1929                                 $pathinfo = substr($simple, length($sofar));
1930                                 $pathinfo .= "/" if ($page =~ /\/$/);
1931                                 $scriptname = $sofar;
1932                                 last;
1933                                 }
1934                         }
1935
1936                 # Run CGI in the same directory as whatever file
1937                 # was requested
1938                 $full =~ /^(.*\/)[^\/]+$/; $cgi_pwd = $1;
1939
1940                 if (-e $full) {
1941                         # Found something!
1942                         $realroot = $root;
1943                         $foundroot = $root;
1944                         last;
1945                         }
1946                 }
1947         if (!@stfull) { &http_error(404, "File not found"); }
1948         }
1949 print DEBUG "handle_request: full=$full\n";
1950 @stfull = stat($full) if (!@stfull);
1951
1952 # check filename against denyfile regexp
1953 local $denyfile = $config{'denyfile'};
1954 if ($denyfile && $full =~ /$denyfile/) {
1955         &http_error(403, "Access denied to $page");
1956         return 0;
1957         }
1958
1959 # Reached the end of the path OK.. see what we've got
1960 if (-d _) {
1961         # See if the URL ends with a / as it should
1962         print DEBUG "handle_request: found a directory\n";
1963         if ($page !~ /\/$/) {
1964                 # It doesn't.. redirect
1965                 &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
1966                 $ssl = $use_ssl || $config{'inetd_ssl'};
1967                 $portstr = $port == 80 && !$ssl ? "" :
1968                            $port == 443 && $ssl ? "" : ":$port";
1969                 &write_data("Date: $datestr\r\n");
1970                 &write_data("Server: $config{server}\r\n");
1971                 $prot = $ssl ? "https" : "http";
1972                 &write_data("Location: $prot://$host$portstr$page/\r\n");
1973                 &write_keep_alive(0);
1974                 &write_data("\r\n");
1975                 &log_request($acpthost, $authuser, $reqline, 302, 0);
1976                 return 0;
1977                 }
1978         # A directory.. check for index files
1979         local $foundidx;
1980         foreach $idx (split(/\s+/, $config{"index_docs"})) {
1981                 $idxfull = "$full/$idx";
1982                 @stidxfull = stat($idxfull);
1983                 if (-r _ && !-d _) {
1984                         $cgi_pwd = $full;
1985                         $full = $idxfull;
1986                         @stfull = @stidxfull;
1987                         $scriptname .= "/" if ($scriptname ne "/");
1988                         $foundidx++;
1989                         last;
1990                         }
1991                 }
1992         @stfull = stat($full) if (!$foundidx);
1993         }
1994 if (-d _) {
1995         # This is definately a directory.. list it
1996         print DEBUG "handle_request: listing directory\n";
1997         local $resp = "HTTP/1.0 $ok_code $ok_message\r\n".
1998                       "Date: $datestr\r\n".
1999                       "Server: $config{server}\r\n".
2000                       "Content-type: text/html\r\n";
2001         &write_data($resp);
2002         &write_keep_alive(0);
2003         &write_data("\r\n");
2004         &reset_byte_count();
2005         &write_data("<h1>Index of $simple</h1>\n");
2006         &write_data("<pre>\n");
2007         &write_data(sprintf "%-35.35s %-20.20s %-10.10s\n",
2008                         "Name", "Last Modified", "Size");
2009         &write_data("<hr>\n");
2010         opendir(DIR, $full);
2011         while($df = readdir(DIR)) {
2012                 if ($df =~ /^\./) { next; }
2013                 $fulldf = $full eq "/" ? $full.$df : $full."/".$df;
2014                 (@stbuf = stat($fulldf)) || next;
2015                 if (-d _) { $df .= "/"; }
2016                 @tm = localtime($stbuf[9]);
2017                 $fdate = sprintf "%2.2d/%2.2d/%4.4d %2.2d:%2.2d:%2.2d",
2018                                 $tm[3],$tm[4]+1,$tm[5]+1900,
2019                                 $tm[0],$tm[1],$tm[2];
2020                 $len = length($df); $rest = " "x(35-$len);
2021                 &write_data(sprintf
2022                  "<a href=\"%s\">%-${len}.${len}s</a>$rest %-20.20s %-10.10s\n",
2023                  $df, $df, $fdate, $stbuf[7]);
2024                 }
2025         closedir(DIR);
2026         &log_request($acpthost, $authuser, $reqline, $ok_code, &byte_count());
2027         return 0;
2028         }
2029
2030 # CGI or normal file
2031 local $rv;
2032 if (&get_type($full) eq "internal/cgi" && $validated != 4) {
2033         # A CGI program to execute
2034         print DEBUG "handle_request: executing CGI\n";
2035         $envtz = $ENV{"TZ"};
2036         $envuser = $ENV{"USER"};
2037         $envpath = $ENV{"PATH"};
2038         $envlang = $ENV{"LANG"};
2039         $envroot = $ENV{"SystemRoot"};
2040         $envperllib = $ENV{'PERLLIB'};
2041         foreach my $k (keys %ENV) {
2042                 delete($ENV{$k});
2043                 }
2044         $ENV{"PATH"} = $envpath if ($envpath);
2045         $ENV{"TZ"} = $envtz if ($envtz);
2046         $ENV{"USER"} = $envuser if ($envuser);
2047         $ENV{"OLD_LANG"} = $envlang if ($envlang);
2048         $ENV{"SystemRoot"} = $envroot if ($envroot);
2049         $ENV{'PERLLIB'} = $envperllib if ($envperllib);
2050         $ENV{"HOME"} = $user_homedir;
2051         $ENV{"SERVER_SOFTWARE"} = $config{"server"};
2052         $ENV{"SERVER_NAME"} = $host;
2053         $ENV{"SERVER_ADMIN"} = $config{"email"};
2054         $ENV{"SERVER_ROOT"} = $roots[0];
2055         $ENV{"SERVER_REALROOT"} = $realroot;
2056         $ENV{"SERVER_PORT"} = $port;
2057         $ENV{"REMOTE_HOST"} = $acpthost;
2058         $ENV{"REMOTE_ADDR"} = $acptip;
2059         $ENV{"REMOTE_USER"} = $authuser;
2060         $ENV{"BASE_REMOTE_USER"} = $authuser ne $baseauthuser ?
2061                                         $baseauthuser : undef;
2062         $ENV{"REMOTE_PASS"} = $authpass if (defined($authpass) &&
2063                                             $config{'pass_password'});
2064         print DEBUG "REMOTE_USER = ",$ENV{"REMOTE_USER"},"\n";
2065         print DEBUG "BASE_REMOTE_USER = ",$ENV{"BASE_REMOTE_USER"},"\n";
2066         $ENV{"SSL_USER"} = $peername if ($validated == 2);
2067         $ENV{"ANONYMOUS_USER"} = "1" if ($validated == 3 || $validated == 4);
2068         $ENV{"DOCUMENT_ROOT"} = $roots[0];
2069         $ENV{"DOCUMENT_REALROOT"} = $realroot;
2070         $ENV{"GATEWAY_INTERFACE"} = "CGI/1.1";
2071         $ENV{"SERVER_PROTOCOL"} = "HTTP/1.0";
2072         $ENV{"REQUEST_METHOD"} = $method;
2073         $ENV{"SCRIPT_NAME"} = $scriptname;
2074         $ENV{"SCRIPT_FILENAME"} = $full;
2075         $ENV{"REQUEST_URI"} = $request_uri;
2076         $ENV{"PATH_INFO"} = $pathinfo;
2077         if ($pathinfo) {
2078                 $ENV{"PATH_TRANSLATED"} = "$roots[0]$pathinfo";
2079                 $ENV{"PATH_REALTRANSLATED"} = "$realroot$pathinfo";
2080                 }
2081         $ENV{"QUERY_STRING"} = $querystring;
2082         $ENV{"MINISERV_CONFIG"} = $config_file;
2083         $ENV{"HTTPS"} = "ON" if ($use_ssl || $config{'inetd_ssl'});
2084         $ENV{"MINISERV_PID"} = $miniserv_main_pid;
2085         $ENV{"SESSION_ID"} = $session_id if ($session_id);
2086         $ENV{"LOCAL_USER"} = $localauth_user if ($localauth_user);
2087         $ENV{"MINISERV_INTERNAL"} = $miniserv_internal if ($miniserv_internal);
2088         if (defined($header{"content-length"})) {
2089                 $ENV{"CONTENT_LENGTH"} = $header{"content-length"};
2090                 }
2091         if (defined($header{"content-type"})) {
2092                 $ENV{"CONTENT_TYPE"} = $header{"content-type"};
2093                 }
2094         foreach $h (keys %header) {
2095                 ($hname = $h) =~ tr/a-z/A-Z/;
2096                 $hname =~ s/\-/_/g;
2097                 $ENV{"HTTP_$hname"} = $header{$h};
2098                 }
2099         $ENV{"PWD"} = $cgi_pwd;
2100         foreach $k (keys %config) {
2101                 if ($k =~ /^env_(\S+)$/) {
2102                         $ENV{$1} = $config{$k};
2103                         }
2104                 }
2105         delete($ENV{'HTTP_AUTHORIZATION'});
2106         $ENV{'HTTP_COOKIE'} =~ s/;?\s*$sidname=([a-f0-9]+)//;
2107         $ENV{'MOBILE_DEVICE'} = 1 if ($mobile_device);
2108
2109         # Check if the CGI can be handled internally
2110         open(CGI, $full);
2111         local $first = <CGI>;
2112         close(CGI);
2113         $first =~ s/[#!\r\n]//g;
2114         $nph_script = ($full =~ /\/nph-([^\/]+)$/);
2115         seek(STDERR, 0, 2);
2116         if (!$config{'forkcgis'} &&
2117             ($first eq $perl_path || $first eq $linked_perl_path) &&
2118               $] >= 5.004 ||
2119             $config{'internalcgis'}) {
2120                 # setup environment for eval
2121                 chdir($ENV{"PWD"});
2122                 @ARGV = split(/\s+/, $queryargs);
2123                 $0 = $full;
2124                 if ($posted_data) {
2125                         # Already read the post input
2126                         $postinput = $posted_data;
2127                         }
2128                 $clen = $header{"content-length"};
2129                 $SIG{'CHLD'} = 'DEFAULT';
2130                 eval {
2131                         # Have SOCK closed if the perl exec's something
2132                         use Fcntl;
2133                         fcntl(SOCK, F_SETFD, FD_CLOEXEC);
2134                         };
2135                 #shutdown(SOCK, 0);
2136
2137                 if ($config{'log'}) {
2138                         open(MINISERVLOG, ">>$config{'logfile'}");
2139                         if ($config{'logperms'}) {
2140                                 chmod(oct($config{'logperms'}),
2141                                       $config{'logfile'});
2142                                 }
2143                         else {
2144                                 chmod(0600, $config{'logfile'});
2145                                 }
2146                         }
2147                 $doing_cgi_eval = 1;
2148                 $main_process_id = $$;
2149                 $pkg = "main";
2150                 if ($full =~ /^\Q$foundroot\E\/([^\/]+)\//) {
2151                         # Eval in package from Webmin module name
2152                         $pkg = $1;
2153                         $pkg =~ s/[^A-Za-z0-9]/_/g;
2154                         }
2155                 eval "
2156                         \%pkg::ENV = \%ENV;
2157                         package $pkg;
2158                         tie(*STDOUT, 'miniserv');
2159                         tie(*STDIN, 'miniserv');
2160                         do \$miniserv::full;
2161                         die \$@ if (\$@);
2162                         ";
2163                 $doing_cgi_eval = 0;
2164                 if ($@) {
2165                         # Error in perl!
2166                         &http_error(500, "Perl execution failed",
2167                                     $config{'noshowstderr'} ? undef : $@);
2168                         }
2169                 elsif (!$doneheaders && !$nph_script) {
2170                         &http_error(500, "Missing Headers");
2171                         }
2172                 $rv = 0;
2173                 }
2174         else {
2175                 $infile = undef;
2176                 if (!$on_windows) {
2177                         # fork the process that actually executes the CGI
2178                         pipe(CGIINr, CGIINw);
2179                         pipe(CGIOUTr, CGIOUTw);
2180                         pipe(CGIERRr, CGIERRw);
2181                         if (!($cgipid = fork())) {
2182                                 @execargs = ( $full, split(/\s+/, $queryargs) );
2183                                 chdir($ENV{"PWD"});
2184                                 close(SOCK);
2185                                 open(STDIN, "<&CGIINr");
2186                                 open(STDOUT, ">&CGIOUTw");
2187                                 open(STDERR, ">&CGIERRw");
2188                                 close(CGIINw); close(CGIOUTr); close(CGIERRr);
2189                                 exec(@execargs) ||
2190                                         die "Failed to exec $full : $!\n";
2191                                 exit(0);
2192                                 }
2193                         close(CGIINr); close(CGIOUTw); close(CGIERRw);
2194                         }
2195                 else {
2196                         # write CGI input to a temp file
2197                         $infile = "$config{'tempbase'}.$$";
2198                         open(CGIINw, ">$infile");
2199                         # NOT binary mode, as CGIs don't read in it!
2200                         }
2201
2202                 # send post data
2203                 if ($posted_data) {
2204                         # already read the posted data
2205                         print CGIINw $posted_data;
2206                         }
2207                 $clen = $header{"content-length"};
2208                 if ($method eq "POST" && $clen_read < $clen) {
2209                         $SIG{'PIPE'} = 'IGNORE';
2210                         $got = $clen_read;
2211                         while($got < $clen) {
2212                                 $buf = &read_data($clen-$got);
2213                                 if (!length($buf)) {
2214                                         kill('TERM', $cgipid);
2215                                         unlink($infile) if ($infile);
2216                                         &http_error(500, "Failed to read ".
2217                                                          "POST request");
2218                                         }
2219                                 $got += length($buf);
2220                                 local ($wrote) = (print CGIINw $buf);
2221                                 last if (!$wrote);
2222                                 }
2223                         # If the CGI terminated early, we still need to read
2224                         # from the browser and throw away
2225                         while($got < $clen) {
2226                                 $buf = &read_data($clen-$got);
2227                                 if (!length($buf)) {
2228                                         kill('TERM', $cgipid);
2229                                         unlink($infile) if ($infile);
2230                                         &http_error(500, "Failed to read ".
2231                                                          "POST request");
2232                                         }
2233                                 $got += length($buf);
2234                                 }
2235                         $SIG{'PIPE'} = 'DEFAULT';
2236                         }
2237                 close(CGIINw);
2238                 shutdown(SOCK, 0);
2239
2240                 if ($on_windows) {
2241                         # Run the CGI program, and feed it input
2242                         chdir($ENV{"PWD"});
2243                         local $qqueryargs = join(" ", map { "\"$_\"" }
2244                                                  split(/\s+/, $queryargs));
2245                         if ($first =~ /(perl|perl.exe)$/i) {
2246                                 # On Windows, run with Perl
2247                                 open(CGIOUTr, "$perl_path \"$full\" $qqueryargs <$infile |");
2248                                 }
2249                         else {
2250                                 open(CGIOUTr, "\"$full\" $qqueryargs <$infile |");
2251                                 }
2252                         binmode(CGIOUTr);
2253                         }
2254
2255                 if (!$nph_script) {
2256                         # read back cgi headers
2257                         select(CGIOUTr); $|=1; select(STDOUT);
2258                         $got_blank = 0;
2259                         while(1) {
2260                                 $line = <CGIOUTr>;
2261                                 $line =~ s/\r|\n//g;
2262                                 if ($line eq "") {
2263                                         if ($got_blank || %cgiheader) { last; }
2264                                         $got_blank++;
2265                                         next;
2266                                         }
2267                                 if ($line !~ /^(\S+):\s+(.*)$/) {
2268                                         $errs = &read_errors(CGIERRr);
2269                                         close(CGIOUTr); close(CGIERRr);
2270                                         unlink($infile) if ($infile);
2271                                         &http_error(500, "Bad Header", $errs);
2272                                         }
2273                                 $cgiheader{lc($1)} = $2;
2274                                 push(@cgiheader, [ $1, $2 ]);
2275                                 }
2276                         if ($cgiheader{"location"}) {
2277                                 &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
2278                                 &write_data("Date: $datestr\r\n");
2279                                 &write_data("Server: $config{'server'}\r\n");
2280                                 &write_keep_alive(0);
2281                                 # ignore the rest of the output. This is a hack,
2282                                 # but is necessary for IE in some cases :(
2283                                 close(CGIOUTr); close(CGIERRr);
2284                                 }
2285                         elsif ($cgiheader{"content-type"} eq "") {
2286                                 close(CGIOUTr); close(CGIERRr);
2287                                 unlink($infile) if ($infile);
2288                                 $errs = &read_errors(CGIERRr);
2289                                 &http_error(500, "Missing Content-Type Header",
2290                                     $config{'noshowstderr'} ? undef : $errs);
2291                                 }
2292                         else {
2293                                 &write_data("HTTP/1.0 $ok_code $ok_message\r\n");
2294                                 &write_data("Date: $datestr\r\n");
2295                                 &write_data("Server: $config{'server'}\r\n");
2296                                 &write_keep_alive(0);
2297                                 }
2298                         foreach $h (@cgiheader) {
2299                                 &write_data("$h->[0]: $h->[1]\r\n");
2300                                 }
2301                         &write_data("\r\n");
2302                         }
2303                 &reset_byte_count();
2304                 while($line = <CGIOUTr>) {
2305                         &write_data($line);
2306                         }
2307                 close(CGIOUTr);
2308                 close(CGIERRr);
2309                 unlink($infile) if ($infile);
2310                 $rv = 0;
2311                 }
2312         }
2313 else {
2314         # A file to output
2315         print DEBUG "handle_request: outputting file\n";
2316         open(FILE, $full) || &http_error(404, "Failed to open file");
2317         binmode(FILE);
2318         local $resp = "HTTP/1.0 $ok_code $ok_message\r\n".
2319                       "Date: $datestr\r\n".
2320                       "Server: $config{server}\r\n".
2321                       "Content-type: ".&get_type($full)."\r\n".
2322                       "Content-length: $stfull[7]\r\n".
2323                       "Last-Modified: ".&http_date($stfull[9])."\r\n".
2324                       "Expires: ".&http_date(time()+$config{'expires'})."\r\n";
2325         &write_data($resp);
2326         $rv = &write_keep_alive();
2327         &write_data("\r\n");
2328         &reset_byte_count();
2329         while(read(FILE, $buf, 1024) > 0) {
2330                 &write_data($buf);
2331                 }
2332         close(FILE);
2333         }
2334
2335 # log the request
2336 &log_request($acpthost, $authuser, $reqline,
2337              $logged_code ? $logged_code :
2338              $cgiheader{"location"} ? "302" : $ok_code, &byte_count());
2339 return $rv;
2340 }
2341
2342 # http_error(code, message, body, [dontexit])
2343 sub http_error
2344 {
2345 local $eh = $error_handler_recurse ? undef :
2346             $config{"error_handler_$_[0]"} ? $config{"error_handler_$_[0]"} :
2347             $config{'error_handler'} ? $config{'error_handler'} : undef;
2348 print DEBUG "http_error code=$_[0] message=$_[1] body=$_[2]\n";
2349 if ($eh) {
2350         # Call a CGI program for the error
2351         $page = "/$eh";
2352         $querystring = "code=$_[0]&message=".&urlize($_[1]).
2353                        "&body=".&urlize($_[2]);
2354         $error_handler_recurse++;
2355         $ok_code = $_[0];
2356         $ok_message = $_[1];
2357         goto rerun;
2358         }
2359 else {
2360         # Use the standard error message display
2361         &write_data("HTTP/1.0 $_[0] $_[1]\r\n");
2362         &write_data("Server: $config{server}\r\n");
2363         &write_data("Date: $datestr\r\n");
2364         &write_data("Content-type: text/html\r\n");
2365         &write_keep_alive(0);
2366         &write_data("\r\n");
2367         &reset_byte_count();
2368         &write_data("<h1>Error - $_[1]</h1>\n");
2369         if ($_[2]) {
2370                 &write_data("<pre>$_[2]</pre>\n");
2371                 }
2372         }
2373 &log_request($acpthost, $authuser, $reqline, $_[0], &byte_count())
2374         if ($reqline);
2375 &log_error($_[1], $_[2] ? " : $_[2]" : "");
2376 shutdown(SOCK, 1);
2377 exit if (!$_[3]);
2378 }
2379
2380 sub get_type
2381 {
2382 if ($_[0] =~ /\.([A-z0-9]+)$/) {
2383         $t = $mime{$1};
2384         if ($t ne "") {
2385                 return $t;
2386                 }
2387         }
2388 return "text/plain";
2389 }
2390
2391 # simplify_path(path, bogus)
2392 # Given a path, maybe containing stuff like ".." and "." convert it to a
2393 # clean, absolute form.
2394 sub simplify_path
2395 {
2396 local($dir, @bits, @fixedbits, $b);
2397 $dir = $_[0];
2398 $dir =~ s/\\/\//g;      # fix windows \ in path
2399 $dir =~ s/^\/+//g;
2400 $dir =~ s/\/+$//g;
2401 $dir =~ s/\0//g;        # remove null bytes
2402 @bits = split(/\/+/, $dir);
2403 @fixedbits = ();
2404 $_[1] = 0;
2405 foreach $b (@bits) {
2406         if ($b eq ".") {
2407                 # Do nothing..
2408                 }
2409         elsif ($b eq ".." || $b eq "...") {
2410                 # Remove last dir
2411                 if (scalar(@fixedbits) == 0) {
2412                         $_[1] = 1;
2413                         return "/";
2414                         }
2415                 pop(@fixedbits);
2416                 }
2417         else {
2418                 # Add dir to list
2419                 push(@fixedbits, $b);
2420                 }
2421         }
2422 return "/" . join('/', @fixedbits);
2423 }
2424
2425 # b64decode(string)
2426 # Converts a string from base64 format to normal
2427 sub b64decode
2428 {
2429     local($str) = $_[0];
2430     local($res);
2431     $str =~ tr|A-Za-z0-9+=/||cd;
2432     $str =~ s/=+$//;
2433     $str =~ tr|A-Za-z0-9+/| -_|;
2434     while ($str =~ /(.{1,60})/gs) {
2435         my $len = chr(32 + length($1)*3/4);
2436         $res .= unpack("u", $len . $1 );
2437     }
2438     return $res;
2439 }
2440
2441 # ip_match(remoteip, localip, [match]+)
2442 # Checks an IP address against a list of IPs, networks and networks/masks
2443 sub ip_match
2444 {
2445 local(@io, @mo, @ms, $i, $j, $hn, $needhn);
2446 @io = split(/\./, $_[0]);
2447 for($i=2; $i<@_; $i++) {
2448         $needhn++ if ($_[$i] =~ /^\*(\S+)$/);
2449         }
2450 if ($needhn && !defined($hn = $ip_match_cache{$_[0]})) {
2451         $hn = gethostbyaddr(inet_aton($_[0]), AF_INET);
2452         $hn = "" if (&to_ipaddress($hn) ne $_[0]);
2453         $ip_match_cache{$_[0]} = $hn;
2454         }
2455 for($i=2; $i<@_; $i++) {
2456         local $mismatch = 0;
2457         if ($_[$i] =~ /^(\S+)\/(\d+)$/) {
2458                 # Convert CIDR to netmask format
2459                 $_[$i] = $1."/".&prefix_to_mask($2);
2460                 }
2461         if ($_[$i] =~ /^(\S+)\/(\S+)$/) {
2462                 # Compare with network/mask
2463                 @mo = split(/\./, $1); @ms = split(/\./, $2);
2464                 for($j=0; $j<4; $j++) {
2465                         if ((int($io[$j]) & int($ms[$j])) != int($mo[$j])) {
2466                                 $mismatch = 1;
2467                                 }
2468                         }
2469                 }
2470         elsif ($_[$i] =~ /^\*(\S+)$/) {
2471                 # Compare with hostname regexp
2472                 $mismatch = 1 if ($hn !~ /$1$/);
2473                 }
2474         elsif ($_[$i] eq 'LOCAL') {
2475                 # Compare with local network
2476                 local @lo = split(/\./, $_[1]);
2477                 if ($lo[0] < 128) {
2478                         $mismatch = 1 if ($lo[0] != $io[0]);
2479                         }
2480                 elsif ($lo[0] < 192) {
2481                         $mismatch = 1 if ($lo[0] != $io[0] ||
2482                                           $lo[1] != $io[1]);
2483                         }
2484                 else {
2485                         $mismatch = 1 if ($lo[0] != $io[0] ||
2486                                           $lo[1] != $io[1] ||
2487                                           $lo[2] != $io[2]);
2488                         }
2489                 }
2490         elsif ($_[$i] !~ /^[0-9\.]+$/) {
2491                 # Compare with hostname
2492                 $mismatch = 1 if ($_[0] ne &to_ipaddress($_[$i]));
2493                 }
2494         else {
2495                 # Compare with IP or network
2496                 @mo = split(/\./, $_[$i]);
2497                 while(@mo && !$mo[$#mo]) { pop(@mo); }
2498                 for($j=0; $j<@mo; $j++) {
2499                         if ($mo[$j] != $io[$j]) {
2500                                 $mismatch = 1;
2501                                 }
2502                         }
2503                 }
2504         return 1 if (!$mismatch);
2505         }
2506 return 0;
2507 }
2508
2509 # users_match(&uinfo, user, ...)
2510 # Returns 1 if a user is in a list of users and groups
2511 sub users_match
2512 {
2513 local $uinfo = shift(@_);
2514 local $u;
2515 local @ginfo = getgrgid($uinfo->[3]);
2516 foreach $u (@_) {
2517         if ($u =~ /^\@(\S+)$/) {
2518                 return 1 if (&is_group_member($uinfo, $1));
2519                 }
2520         elsif ($u =~ /^(\d*)-(\d*)$/ && ($1 || $2)) {
2521                 return (!$1 || $uinfo[2] >= $1) &&
2522                        (!$2 || $uinfo[2] <= $2);
2523                 }
2524         else {
2525                 return 1 if ($u eq $uinfo->[0]);
2526                 }
2527         }
2528 return 0;
2529 }
2530
2531 # restart_miniserv()
2532 # Called when a SIGHUP is received to restart the web server. This is done
2533 # by exec()ing perl with the same command line as was originally used
2534 sub restart_miniserv
2535 {
2536 print STDERR "restarting miniserv\n";
2537 &log_error("Restarting");
2538 close(SOCK);
2539 &close_all_sockets();
2540 &close_all_pipes();
2541 dbmclose(%sessiondb);
2542 kill('KILL', $logclearer) if ($logclearer);
2543 kill('KILL', $extauth) if ($extauth);
2544 exec($perl_path, $miniserv_path, @miniserv_argv);
2545 die "Failed to restart miniserv with $perl_path $miniserv_path";
2546 }
2547
2548 sub trigger_restart
2549 {
2550 $need_restart = 1;
2551 }
2552
2553 sub trigger_reload
2554 {
2555 $need_reload = 1;
2556 }
2557
2558 sub to_ipaddress
2559 {
2560 local (@rv, $i);
2561 foreach $i (@_) {
2562         if ($i =~ /(\S+)\/(\S+)/ || $i =~ /^\*\S+$/ ||
2563             $i eq 'LOCAL' || $i =~ /^[0-9\.]+$/) { push(@rv, $i); }
2564         else { push(@rv, join('.', unpack("CCCC", inet_aton($i)))); }
2565         }
2566 return wantarray ? @rv : $rv[0];
2567 }
2568
2569 # read_line(no-wait, no-limit)
2570 # Reads one line from SOCK or SSL
2571 sub read_line
2572 {
2573 local ($nowait, $nolimit) = @_;
2574 local($idx, $more, $rv);
2575 while(($idx = index($main::read_buffer, "\n")) < 0) {
2576         if (length($main::read_buffer) > 10000 && !$nolimit) {
2577                 &http_error(414, "Request too long",
2578                     "Received excessive line <pre>$main::read_buffer</pre>");
2579                 }
2580
2581         # need to read more..
2582         &wait_for_data_error() if (!$nowait);
2583         if ($use_ssl) {
2584                 $more = Net::SSLeay::read($ssl_con);
2585                 }
2586         else {
2587                 local $ok = sysread(SOCK, $more, 1024);
2588                 $more = undef if ($ok <= 0);
2589                 }
2590         if ($more eq '') {
2591                 # end of the data
2592                 $rv = $main::read_buffer;
2593                 undef($main::read_buffer);
2594                 return $rv;
2595                 }
2596         $main::read_buffer .= $more;
2597         }
2598 $rv = substr($main::read_buffer, 0, $idx+1);
2599 $main::read_buffer = substr($main::read_buffer, $idx+1);
2600 return $rv;
2601 }
2602
2603 # read_data(length)
2604 # Reads up to some amount of data from SOCK or the SSL connection
2605 sub read_data
2606 {
2607 local ($rv);
2608 if (length($main::read_buffer)) {
2609         if (length($main::read_buffer) > $_[0]) {
2610                 # Return the first part of the buffer
2611                 $rv = substr($main::read_buffer, 0, $_[0]);
2612                 $main::read_buffer = substr($main::read_buffer, $_[0]);
2613                 return $rv;
2614                 }
2615         else {
2616                 # Return the whole buffer
2617                 $rv = $main::read_buffer;
2618                 undef($main::read_buffer);
2619                 return $rv;
2620                 }
2621         }
2622 elsif ($use_ssl) {
2623         # Call SSL read function
2624         return Net::SSLeay::read($ssl_con, $_[0]);
2625         }
2626 else {
2627         # Just do a normal read
2628         local $buf;
2629         sysread(SOCK, $buf, $_[0]) || return undef;
2630         return $buf;
2631         }
2632 }
2633
2634 # sysread_line(fh)
2635 # Read a line from a file handle, using sysread to get a byte at a time
2636 sub sysread_line
2637 {
2638 local ($fh) = @_;
2639 local $line;
2640 while(1) {
2641         local ($buf, $got);
2642         $got = sysread($fh, $buf, 1);
2643         last if ($got <= 0);
2644         $line .= $buf;
2645         last if ($buf eq "\n");
2646         }
2647 return $line;
2648 }
2649
2650 # wait_for_data(secs)
2651 # Waits at most the given amount of time for some data on SOCK, returning
2652 # 0 if not found, 1 if some arrived.
2653 sub wait_for_data
2654 {
2655 local $rmask;
2656 vec($rmask, fileno(SOCK), 1) = 1;
2657 local $got = select($rmask, undef, undef, $_[0]);
2658 return $got == 0 ? 0 : 1;
2659 }
2660
2661 # wait_for_data_error()
2662 # Waits 60 seconds for data on SOCK, and fails if none arrives
2663 sub wait_for_data_error
2664 {
2665 local $got = &wait_for_data(60);
2666 if (!$got) {
2667         &http_error(400, "Timeout",
2668                     "Waited more than 60 seconds for request data");
2669         }
2670 }
2671
2672 # write_data(data, ...)
2673 # Writes a string to SOCK or the SSL connection
2674 sub write_data
2675 {
2676 local $str = join("", @_);
2677 if ($use_ssl) {
2678         Net::SSLeay::write($ssl_con, $str);
2679         }
2680 else {
2681         syswrite(SOCK, $str, length($str));
2682         }
2683 # Intentionally introduce a small delay to avoid problems where IE reports
2684 # the page as empty / DNS failed when it get a large response too quickly!
2685 select(undef, undef, undef, .01) if ($write_data_count%10 == 0);
2686 $write_data_count += length($str);
2687 }
2688
2689 # reset_byte_count()
2690 sub reset_byte_count { $write_data_count = 0; }
2691
2692 # byte_count()
2693 sub byte_count { return $write_data_count; }
2694
2695 # log_request(hostname, user, request, code, bytes)
2696 sub log_request
2697 {
2698 if ($config{'log'}) {
2699         local ($user, $ident, $headers);
2700         if ($config{'logident'}) {
2701                 # add support for rfc1413 identity checking here
2702                 }
2703         else { $ident = "-"; }
2704         $user = $_[1] ? $_[1] : "-";
2705         local $dstr = &make_datestr();
2706         if (fileno(MINISERVLOG)) {
2707                 seek(MINISERVLOG, 0, 2);
2708                 }
2709         else {
2710                 open(MINISERVLOG, ">>$config{'logfile'}");
2711                 chmod(0600, $config{'logfile'});
2712                 }
2713         if (defined($config{'logheaders'})) {
2714                 foreach $h (split(/\s+/, $config{'logheaders'})) {
2715                         $headers .= " $h=\"$header{$h}\"";
2716                         }
2717                 }
2718         elsif ($config{'logclf'}) {
2719                 $headers = " \"$header{'referer'}\" \"$header{'user-agent'}\"";
2720                 }
2721         else {
2722                 $headers = "";
2723                 }
2724         print MINISERVLOG "$_[0] $ident $user [$dstr] \"$_[2]\" ",
2725                           "$_[3] $_[4]$headers\n";
2726         close(MINISERVLOG);
2727         }
2728 }
2729
2730 # make_datestr()
2731 sub make_datestr
2732 {
2733 local @tm = localtime(time());
2734 return sprintf "%2.2d/%s/%4.4d:%2.2d:%2.2d:%2.2d %s",
2735                 $tm[3], $month[$tm[4]], $tm[5]+1900,
2736                 $tm[2], $tm[1], $tm[0], $timezone;
2737 }
2738
2739 # log_error(message)
2740 sub log_error
2741 {
2742 seek(STDERR, 0, 2);
2743 print STDERR "[",&make_datestr(),"] ",
2744         $acpthost ? ( "[",$acpthost,"] " ) : ( ),
2745         $page ? ( $page," : " ) : ( ),
2746         @_,"\n";
2747 }
2748
2749 # read_errors(handle)
2750 # Read and return all input from some filehandle
2751 sub read_errors
2752 {
2753 local($fh, $_, $rv);
2754 $fh = $_[0];
2755 while(<$fh>) { $rv .= $_; }
2756 return $rv;
2757 }
2758
2759 sub write_keep_alive
2760 {
2761 local $mode;
2762 if ($config{'nokeepalive'}) {
2763         # Keep alives have been disabled in config
2764         $mode = 0;
2765         }
2766 elsif (@childpids > $config{'maxconns'}*.8) {
2767         # Disable because nearing process limit
2768         $mode = 0;
2769         }
2770 elsif (@_) {
2771         # Keep alive specified by caller
2772         $mode = $_[0];
2773         }
2774 else {
2775         # Keep alive determined by browser
2776         $mode = $header{'connection'} =~ /keep-alive/i;
2777         }
2778 &write_data("Connection: ".($mode ? "Keep-Alive" : "close")."\r\n");
2779 return $mode;
2780 }
2781
2782 sub term_handler
2783 {
2784 kill('TERM', @childpids) if (@childpids);
2785 kill('KILL', $logclearer) if ($logclearer);
2786 kill('KILL', $extauth) if ($extauth);
2787 exit(1);
2788 }
2789
2790 sub http_date
2791 {
2792 local @tm = gmtime($_[0]);
2793 return sprintf "%s, %d %s %d %2.2d:%2.2d:%2.2d GMT",
2794                 $weekday[$tm[6]], $tm[3], $month[$tm[4]], $tm[5]+1900,
2795                 $tm[2], $tm[1], $tm[0];
2796 }
2797
2798 sub TIEHANDLE
2799 {
2800 my $i; bless \$i, shift;
2801 }
2802
2803 sub WRITE
2804 {
2805 $r = shift;
2806 my($buf,$len,$offset) = @_;
2807 &write_to_sock(substr($buf, $offset, $len));
2808 }
2809
2810 sub PRINT
2811 {
2812 $r = shift;
2813 $$r++;
2814 my $buf = join(defined($,) ? $, : "", @_);
2815 $buf .= $\ if defined($\);
2816 &write_to_sock($buf);
2817 }
2818
2819 sub PRINTF
2820 {
2821 shift;
2822 my $fmt = shift;
2823 &write_to_sock(sprintf $fmt, @_);
2824 }
2825
2826 # Send back already read data while we have it, then read from SOCK
2827 sub READ
2828 {
2829 my $r = shift;
2830 my $bufref = \$_[0];
2831 my $len = $_[1];
2832 my $offset = $_[2];
2833 if ($postpos < length($postinput)) {
2834         # Reading from already fetched array
2835         my $left = length($postinput) - $postpos;
2836         my $canread = $len > $left ? $left : $len;
2837         substr($$bufref, $offset, $canread) =
2838                 substr($postinput, $postpos, $canread);
2839         $postpos += $canread;
2840         return $canread;
2841         }
2842 else {
2843         # Read from network socket
2844         local $data = &read_data($len);
2845         if ($data eq '' && $len) {
2846                 # End of socket
2847                 print STDERR "finished reading - shutting down socket\n";
2848                 shutdown(SOCK, 0);
2849                 }
2850         substr($$bufref, $offset, length($data)) = $data;
2851         return length($data);
2852         }
2853 }
2854
2855 sub OPEN
2856 {
2857 #print STDERR "open() called - should never happen!\n";
2858 }
2859
2860 # Read a line of input
2861 sub READLINE
2862 {
2863 my $r = shift;
2864 if ($postpos < length($postinput) &&
2865     ($idx = index($postinput, "\n", $postpos)) >= 0) {
2866         # A line exists in the memory buffer .. use it
2867         my $line = substr($postinput, $postpos, $idx-$postpos+1);
2868         $postpos = $idx+1;
2869         return $line;
2870         }
2871 else {
2872         # Need to read from the socket
2873         my $line;
2874         if ($postpos < length($postinput)) {
2875                 # Start with in-memory data
2876                 $line = substr($postinput, $postpos);
2877                 $postpos = length($postinput);
2878                 }
2879         my $nl = &read_line(0, 1);
2880         if ($nl eq '') {
2881                 # End of socket
2882                 print STDERR "finished reading - shutting down socket\n";
2883                 shutdown(SOCK, 0);
2884                 }
2885         $line .= $nl if (defined($nl));
2886         return $line;
2887         }
2888 }
2889
2890 # Read one character of input
2891 sub GETC
2892 {
2893 my $r = shift;
2894 my $buf;
2895 my $got = READ($r, \$buf, 1, 0);
2896 return $got > 0 ? $buf : undef;
2897 }
2898
2899 sub FILENO
2900 {
2901 return fileno(SOCK);
2902 }
2903
2904 sub CLOSE { }
2905
2906 sub DESTROY { }
2907
2908 # write_to_sock(data, ...)
2909 sub write_to_sock
2910 {
2911 local $d;
2912 foreach $d (@_) {
2913         if ($doneheaders || $miniserv::nph_script) {
2914                 &write_data($d);
2915                 }
2916         else {
2917                 $headers .= $d;
2918                 while(!$doneheaders && $headers =~ s/^([^\r\n]*)(\r)?\n//) {
2919                         if ($1 =~ /^(\S+):\s+(.*)$/) {
2920                                 $cgiheader{lc($1)} = $2;
2921                                 push(@cgiheader, [ $1, $2 ]);
2922                                 }
2923                         elsif ($1 !~ /\S/) {
2924                                 $doneheaders++;
2925                                 }
2926                         else {
2927                                 &http_error(500, "Bad Header");
2928                                 }
2929                         }
2930                 if ($doneheaders) {
2931                         if ($cgiheader{"location"}) {
2932                                 &write_data(
2933                                         "HTTP/1.0 302 Moved Temporarily\r\n");
2934                                 &write_data("Date: $datestr\r\n");
2935                                 &write_data("Server: $config{server}\r\n");
2936                                 &write_keep_alive(0);
2937                                 }
2938                         elsif ($cgiheader{"content-type"} eq "") {
2939                                 &http_error(500, "Missing Content-Type Header");
2940                                 }
2941                         else {
2942                                 &write_data("HTTP/1.0 $ok_code $ok_message\r\n");
2943                                 &write_data("Date: $datestr\r\n");
2944                                 &write_data("Server: $config{server}\r\n");
2945                                 &write_keep_alive(0);
2946                                 }
2947                         foreach $h (@cgiheader) {
2948                                 &write_data("$h->[0]: $h->[1]\r\n");
2949                                 }
2950                         &write_data("\r\n");
2951                         &reset_byte_count();
2952                         &write_data($headers);
2953                         }
2954                 }
2955         }
2956 }
2957
2958 sub verify_client
2959 {
2960 local $cert = Net::SSLeay::X509_STORE_CTX_get_current_cert($_[1]);
2961 if ($cert) {
2962         local $errnum = Net::SSLeay::X509_STORE_CTX_get_error($_[1]);
2963         $verified_client = 1 if (!$errnum);
2964         }
2965 return 1;
2966 }
2967
2968 sub END
2969 {
2970 if ($doing_cgi_eval && $$ == $main_process_id) {
2971         # A CGI program called exit! This is a horrible hack to
2972         # finish up before really exiting
2973         shutdown(SOCK, 1);
2974         close(SOCK);
2975         close($PASSINw); close($PASSOUTw);
2976         &log_request($acpthost, $authuser, $reqline,
2977                      $cgiheader{"location"} ? "302" : $ok_code, &byte_count());
2978         }
2979 }
2980
2981 # urlize
2982 # Convert a string to a form ok for putting in a URL
2983 sub urlize {
2984   local($tmp, $tmp2, $c);
2985   $tmp = $_[0];
2986   $tmp2 = "";
2987   while(($c = chop($tmp)) ne "") {
2988         if ($c !~ /[A-z0-9]/) {
2989                 $c = sprintf("%%%2.2X", ord($c));
2990                 }
2991         $tmp2 = $c . $tmp2;
2992         }
2993   return $tmp2;
2994 }
2995
2996 # validate_user(username, password, host)
2997 # Checks if some username and password are valid. Returns the modified username,
2998 # the expired / temp pass flag, and the non-existence flag
2999 sub validate_user
3000 {
3001 local ($user, $pass, $host) = @_;
3002 return ( ) if (!$user);
3003 print DEBUG "validate_user: user=$user pass=$pass host=$host\n";
3004 local ($canuser, $canmode, $notexist, $webminuser, $sudo) =
3005         &can_user_login($user, undef, $host);
3006 print DEBUG "validate_user: canuser=$canuser canmode=$canmode notexist=$notexist webminuser=$webminuser sudo=$sudo\n";
3007 if ($notexist) {
3008         # User doesn't even exist, so go no further
3009         return ( undef, 0, 1 );
3010         }
3011 elsif ($canmode == 0) {
3012         # User does exist but cannot login
3013         return ( $canuser, 0, 0 );
3014         }
3015 elsif ($canmode == 1) {
3016         # Attempt Webmin authentication
3017         my $uinfo = &get_user_details($webminuser);
3018         if ($uinfo && &password_crypt($pass, $uinfo->{'pass'})) {
3019                 # Password is valid .. but check for expiry
3020                 local $lc = $uinfo->{'lastchanges'};
3021                 if ($config{'pass_maxdays'} && $lc && !$uinfo->{'nochange'}) {
3022                         local $daysold = (time() - $lc)/(24*60*60);
3023                         print DEBUG "maxdays=$config{'pass_maxdays'} daysold=$daysold temppass=$uinfo->{'temppass'}\n";
3024                         if ($config{'pass_lockdays'} &&
3025                             $daysold > $config{'pass_lockdays'}) {
3026                                 # So old that the account is locked
3027                                 return ( undef, 0, 0 );
3028                                 }
3029                         elsif ($daysold > $config{'pass_maxdays'}) {
3030                                 # Password has expired
3031                                 return ( $user, 1, 0 );
3032                                 }
3033                         }
3034                 if ($uinfo->{'temppass'}) {
3035                         # Temporary password - force change now
3036                         return ( $user, 2, 0 );
3037                         }
3038                 return ( $user, 0, 0 );
3039                 }
3040         else {
3041                 return ( undef, 0, 0 );
3042                 }
3043         }
3044 elsif ($canmode == 2 || $canmode == 3) {
3045         # Attempt PAM or passwd file authentication
3046         local $val = &validate_unix_user($canuser, $pass);
3047         print DEBUG "validate_user: unix val=$val\n";
3048         if ($val && $sudo) {
3049                 # Need to check if this Unix user can sudo
3050                 if (!&check_sudo_permissions($canuser, $pass)) {
3051                         print DEBUG "validate_user: sudo failed\n";
3052                         $val = 0;
3053                         }
3054                 else {
3055                         print DEBUG "validate_user: sudo passed\n";
3056                         }
3057                 }
3058         return $val == 2 ? ( $canuser, 1, 0 ) :
3059                $val == 1 ? ( $canuser, 0, 0 ) : ( undef, 0, 0 );
3060         }
3061 elsif ($canmode == 4) {
3062         # Attempt external authentication
3063         return &validate_external_user($canuser, $pass) ?
3064                 ( $canuser, 0, 0 ) : ( undef, 0, 0 );
3065         }
3066 else {
3067         # Can't happen!
3068         return ( );
3069         }
3070 }
3071
3072 # validate_unix_user(user, password)
3073 # Returns 1 if a username and password are valid under unix, 0 if not,
3074 # or 2 if the account has expired.
3075 # Checks PAM if available, and falls back to reading the system password
3076 # file otherwise.
3077 sub validate_unix_user
3078 {
3079 if ($use_pam) {
3080         # Check with PAM
3081         $pam_username = $_[0];
3082         $pam_password = $_[1];
3083         eval "use Authen::PAM;";
3084         local $pamh = new Authen::PAM($config{'pam'}, $pam_username,
3085                                       \&pam_conv_func);
3086         if (ref($pamh)) {
3087                 local $pam_ret = $pamh->pam_authenticate();
3088                 if ($pam_ret == PAM_SUCCESS()) {
3089                         # Logged in OK .. make sure password hasn't expired
3090                         local $acct_ret = $pamh->pam_acct_mgmt();
3091                         if ($acct_ret == PAM_SUCCESS()) {
3092                                 $pamh->pam_open_session();
3093                                 return 1;
3094                                 }
3095                         elsif ($acct_ret == PAM_NEW_AUTHTOK_REQD() ||
3096                                $acct_ret == PAM_ACCT_EXPIRED()) {
3097                                 return 2;
3098                                 }
3099                         else {
3100                                 print STDERR "Unknown pam_acct_mgmt return value : $acct_ret\n";
3101                                 return 0;
3102                                 }
3103                         }
3104                 return 0;
3105                 }
3106         }
3107 elsif ($config{'pam_only'}) {
3108         # Pam is not available, but configuration forces it's use!
3109         return 0;
3110         }
3111 elsif ($config{'passwd_file'}) {
3112         # Check in a password file
3113         local $rv = 0;
3114         open(FILE, $config{'passwd_file'});
3115         if ($config{'passwd_file'} eq '/etc/security/passwd') {
3116                 # Assume in AIX format
3117                 while(<FILE>) {
3118                         s/\s*$//;
3119                         if (/^\s*(\S+):/ && $1 eq $_[0]) {
3120                                 $_ = <FILE>;
3121                                 if (/^\s*password\s*=\s*(\S+)\s*$/) {
3122                                         $rv = $1 eq &password_crypt($_[1], $1) ?
3123                                                 1 : 0;
3124                                         }
3125                                 last;
3126                                 }
3127                         }
3128                 }
3129         else {
3130                 # Read the system password or shadow file
3131                 while(<FILE>) {
3132                         local @l = split(/:/, $_, -1);
3133                         local $u = $l[$config{'passwd_uindex'}];
3134                         local $p = $l[$config{'passwd_pindex'}];
3135                         if ($u eq $_[0]) {
3136                                 $rv = $p eq &password_crypt($_[1], $p) ? 1 : 0;
3137                                 if ($config{'passwd_cindex'} ne '' && $rv) {
3138                                         # Password may have expired!
3139                                         local $c = $l[$config{'passwd_cindex'}];
3140                                         local $m = $l[$config{'passwd_mindex'}];
3141                                         local $day = time()/(24*60*60);
3142                                         if ($c =~ /^\d+/ && $m =~ /^\d+/ &&
3143                                             $day - $c > $m) {
3144                                                 # Yep, it has ..
3145                                                 $rv = 2;
3146                                                 }
3147                                         }
3148                                 if ($p eq "" && $config{'passwd_blank'}) {
3149                                         # Force password change
3150                                         $rv = 2;
3151                                         }
3152                                 last;
3153                                 }
3154                         }
3155                 }
3156         close(FILE);
3157         return $rv if ($rv);
3158         }
3159
3160 # Fallback option - check password returned by getpw*
3161 local @uinfo = getpwnam($_[0]);
3162 if ($uinfo[1] ne '' && &password_crypt($_[1], $uinfo[1]) eq $uinfo[1]) {
3163         return 1;
3164         }
3165
3166 return 0;       # Totally failed
3167 }
3168
3169 # validate_external_user(user, pass)
3170 # Validate a user by passing the username and password to an external
3171 # squid-style authentication program
3172 sub validate_external_user
3173 {
3174 return 0 if (!$config{'extauth'});
3175 flock(EXTAUTH, 2);
3176 local $str = "$_[0] $_[1]\n";
3177 syswrite(EXTAUTH, $str, length($str));
3178 local $resp = <EXTAUTH>;
3179 flock(EXTAUTH, 8);
3180 return $resp =~ /^OK/i ? 1 : 0;
3181 }
3182
3183 # can_user_login(username, no-append, host)
3184 # Checks if a user can login or not.
3185 # First return value is the username.
3186 # Second is 0 if cannot login, 1 if using Webmin pass, 2 if PAM, 3 if password
3187 # file, 4 if external.
3188 # Third is 1 if the user does not exist at all, 0 if he does.
3189 # Fourth is the Webmin username whose permissions apply, based on unixauth.
3190 # Fifth is a flag indicating if a sudo check is needed.
3191 sub can_user_login
3192 {
3193 local $uinfo = &get_user_details($_[0]);
3194 if (!$uinfo) {
3195         # See if this user exists in Unix and can be validated by the same
3196         # method as the unixauth webmin user
3197         local $realuser = $unixauth{$_[0]};
3198         local @uinfo;
3199         local $sudo = 0;
3200         local $pamany = 0;
3201         eval { @uinfo = getpwnam($_[0]); };     # may fail on windows
3202         if (!$realuser && @uinfo) {
3203                 # No unixauth entry for the username .. try his groups
3204                 foreach my $ua (keys %unixauth) {
3205                         if ($ua =~ /^\@(.*)$/) {
3206                                 if (&is_group_member(\@uinfo, $1)) {
3207                                         $realuser = $unixauth{$ua};
3208                                         last;
3209                                         }
3210                                 }
3211                         }
3212                 }
3213         if (!$realuser && @uinfo) {
3214                 # Fall back to unix auth for all Unix users
3215                 $realuser = $unixauth{"*"};
3216                 }
3217         if (!$realuser && $use_sudo && @uinfo) {
3218                 # Allow login effectively as root, if sudo permits it
3219                 $sudo = 1;
3220                 $realuser = "root";
3221                 }
3222         if (!$realuser && !@uinfo && $config{'pamany'}) {
3223                 # If the user completely doesn't exist, we can still allow
3224                 # him to authenticate via PAM
3225                 $realuser = $config{'pamany'};
3226                 $pamany = 1;
3227                 }
3228         if (!$realuser) {
3229                 # For Usermin, always fall back to unix auth for any user,
3230                 # so that later checks with domain added / removed are done.
3231                 $realuser = $unixauth{"*"};
3232                 }
3233         return (undef, 0, 1, undef) if (!$realuser);
3234         local $uinfo = &get_user_details($realuser);
3235         return (undef, 0, 1, undef) if (!$uinfo);
3236         local $up = $uinfo{'pass'};
3237
3238         # Work out possible domain names from the hostname
3239         local @doms = ( $_[2] );
3240         if ($_[2] =~ /^([^\.]+)\.(\S+)$/) {
3241                 push(@doms, $2);
3242                 }
3243
3244         if ($config{'user_mapping'} && !%user_mapping) {
3245                 # Read the user mapping file
3246                 %user_mapping = ();
3247                 open(MAPPING, $config{'user_mapping'});
3248                 while(<MAPPING>) {
3249                         s/\r|\n//g;
3250                         s/#.*$//;
3251                         if (/^(\S+)\s+(\S+)/) {
3252                                 if ($config{'user_mapping_reverse'}) {
3253                                         $user_mapping{$1} = $2;
3254                                         }
3255                                 else {
3256                                         $user_mapping{$2} = $1;
3257                                         }
3258                                 }
3259                         }
3260                 close(MAPPING);
3261                 }
3262
3263         # Check the user mapping file to see if there is an entry for the
3264         # user login in which specifies a new effective user
3265         local $um;
3266         foreach my $d (@doms) {
3267                 $um ||= $user_mapping{"$_[0]\@$d"};
3268                 }
3269         $um ||= $user_mapping{$_[0]};
3270         if (defined($um) && ($_[1]&4) == 0) {
3271                 # A mapping exists - use it!
3272                 return &can_user_login($um, $_[1]+4, $_[2]);
3273                 }
3274
3275         # Check if a user with the entered login and the domains appended
3276         # or prepended exists, and if so take it to be the effective user
3277         if (!@uinfo && $config{'domainuser'}) {
3278                 # Try again with name.domain and name.firstpart
3279                 local @firsts = map { /^([^\.]+)/; $1 } @doms;
3280                 if (($_[1]&1) == 0) {
3281                         local ($a, $p);
3282                         foreach $a (@firsts, @doms) {
3283                                 foreach $p ("$_[0].${a}", "$_[0]-${a}",
3284                                             "${a}.$_[0]", "${a}-$_[0]",
3285                                             "$_[0]_${a}", "${a}_$_[0]") {
3286                                         local @vu = &can_user_login(
3287                                                         $p, $_[1]+1, $_[2]);
3288                                         return @vu if ($vu[1]);
3289                                         }
3290                                 }
3291                         }
3292                 }
3293
3294         # Check if the user entered a domain at the end of his username when
3295         # he really shouldn't have, and if so try without it
3296         if (!@uinfo && $config{'domainstrip'} &&
3297             $_[0] =~ /^(\S+)\@(\S+)$/ && ($_[1]&2) == 0) {
3298                 local ($stripped, $dom) = ($1, $2);
3299                 local @vu = &can_user_login($stripped, $_[1] + 2, $_[2]);
3300                 return @vu if ($vu[1]);
3301                 local @vu = &can_user_login($stripped, $_[1] + 2, $dom);
3302                 return @vu if ($vu[1]);
3303                 }
3304
3305         return ( undef, 0, 1, undef ) if (!@uinfo && !$pamany);
3306
3307         if (@uinfo) {
3308                 if (defined(@allowusers)) {
3309                         # Only allow people on the allow list
3310                         return ( undef, 0, 0, undef )
3311                                 if (!&users_match(\@uinfo, @allowusers));
3312                         }
3313                 elsif (defined(@denyusers)) {
3314                         # Disallow people on the deny list
3315                         return ( undef, 0, 0, undef )
3316                                 if (&users_match(\@uinfo, @denyusers));
3317                         }
3318                 if ($config{'shells_deny'}) {
3319                         local $found = 0;
3320                         open(SHELLS, $config{'shells_deny'});
3321                         while(<SHELLS>) {
3322                                 s/\r|\n//g;
3323                                 s/#.*$//;
3324                                 $found++ if ($_ eq $uinfo[8]);
3325                                 }
3326                         close(SHELLS);
3327                         return ( undef, 0, 0, undef ) if (!$found);
3328                         }
3329                 }
3330
3331         if ($up eq 'x') {
3332                 # PAM or passwd file authentication
3333                 return ( $_[0], $use_pam ? 2 : 3, 0, $realuser, $sudo );
3334                 }
3335         elsif ($up eq 'e') {
3336                 # External authentication
3337                 return ( $_[0], 4, 0, $realuser, $sudo );
3338                 }
3339         else {
3340                 # Fixed Webmin password
3341                 return ( $_[0], 1, 0, $realuser, $sudo );
3342                 }
3343         }
3344 elsif ($uinfo->{'pass'} eq 'x') {
3345         # Webmin user authenticated via PAM or password file
3346         return ( $_[0], $use_pam ? 2 : 3, 0, $_[0] );
3347         }
3348 elsif ($uinfo->{'pass'} eq 'e') {
3349         # Webmin user authenticated externally
3350         return ( $_[0], 4, 0, $_[0] );
3351         }
3352 else {
3353         # Normal Webmin user
3354         return ( $_[0], 1, 0, $_[0] );
3355         }
3356 }
3357
3358 # the PAM conversation function for interactive logins
3359 sub pam_conv_func
3360 {
3361 $pam_conv_func_called++;
3362 my @res;
3363 while ( @_ ) {
3364         my $code = shift;
3365         my $msg = shift;
3366         my $ans = "";
3367
3368         $ans = $pam_username if ($code == PAM_PROMPT_ECHO_ON() );
3369         $ans = $pam_password if ($code == PAM_PROMPT_ECHO_OFF() );
3370
3371         push @res, PAM_SUCCESS();
3372         push @res, $ans;
3373         }
3374 push @res, PAM_SUCCESS();
3375 return @res;
3376 }
3377
3378 sub urandom_timeout
3379 {
3380 close(RANDOM);
3381 }
3382
3383 # get_socket_name(handle)
3384 # Returns the local hostname or IP address of some connection
3385 sub get_socket_name
3386 {
3387 return $config{'host'} if ($config{'host'});
3388 local $sn = getsockname($_[0]);
3389 return undef if (!$sn);
3390 local $myaddr = (unpack_sockaddr_in($sn))[1];
3391 if (!$get_socket_name_cache{$myaddr}) {
3392         local $myname;
3393         if (!$config{'no_resolv_myname'}) {
3394                 $myname = gethostbyaddr($myaddr, AF_INET);
3395                 }
3396         if ($myname eq "") {
3397                 $myname = inet_ntoa($myaddr);
3398                 }
3399         $get_socket_name_cache{$myaddr} = $myname;
3400         }
3401 return $get_socket_name_cache{$myaddr};
3402 }
3403
3404 # run_login_script(username, sid, remoteip, localip)
3405 sub run_login_script
3406 {
3407 if ($config{'login_script'}) {
3408         system($config{'login_script'}.
3409                " ".join(" ", map { quotemeta($_) || '""' } @_).
3410                " >/dev/null 2>&1 </dev/null");
3411         }
3412 }
3413
3414 # run_logout_script(username, sid, remoteip, localip)
3415 sub run_logout_script
3416 {
3417 if ($config{'logout_script'}) {
3418         system($config{'logout_script'}.
3419                " ".join(" ", map { quotemeta($_) || '""' } @_).
3420                " >/dev/null 2>&1 </dev/null");
3421         }
3422 }
3423
3424 # close_all_sockets()
3425 # Closes all the main listening sockets
3426 sub close_all_sockets
3427 {
3428 local $s;
3429 foreach $s (@socketfhs) {
3430         close($s);
3431         }
3432 }
3433
3434 # close_all_pipes()
3435 # Close all pipes for talking to sub-processes
3436 sub close_all_pipes
3437 {
3438 local $p;
3439 foreach $p (@passin) { close($p); }
3440 foreach $p (@passout) { close($p); }
3441 foreach $p (values %conversations) {
3442         if ($p->{'PAMOUTr'}) {
3443                 close($p->{'PAMOUTr'});
3444                 close($p->{'PAMINw'});
3445                 }
3446         }
3447 }
3448
3449 # check_user_ip(user)
3450 # Returns 1 if some user is allowed to login from the accepting IP, 0 if not
3451 sub check_user_ip
3452 {
3453 local ($username) = @_;
3454 local $uinfo = &get_user_details($username);
3455 return 1 if (!$uinfo);
3456 if ($uinfo->{'deny'} &&
3457     &ip_match($acptip, $localip, @{$uinfo->{'deny'}}) ||
3458     $uinfo->{'allow'} &&
3459     !&ip_match($acptip, $localip, @{$uinfo->{'allow'}})) {
3460         return 0;
3461         }
3462 return 1;
3463 }
3464
3465 # check_user_time(user)
3466 # Returns 1 if some user is allowed to login at the current date and time
3467 sub check_user_time
3468 {
3469 local ($username) = @_;
3470 local $uinfo = &get_user_details($username);
3471 return 1 if (!$uinfo || !$uinfo->{'allowdays'} && !$uinfo->{'allowhours'});
3472 local @tm = localtime(time());
3473 if ($uinfo->{'allowdays'}) {
3474         # Make sure day is allowed
3475         return 0 if (&indexof($tm[6], @{$uinfo->{'allowdays'}}) < 0);
3476         }
3477 if ($uinfo->{'allowhours'}) {
3478         # Make sure time is allowed
3479         local $m = $tm[2]*60+$tm[1];
3480         return 0 if ($m < $uinfo->{'allowhours'}->[0] ||
3481                      $m > $uinfo->{'allowhours'}->[1]);
3482         }
3483 return 1;
3484 }
3485
3486 # generate_random_id(password, [force-urandom])
3487 # Returns a random session ID number
3488 sub generate_random_id
3489 {
3490 local ($pass, $force_urandom) = @_;
3491 local $sid;
3492 if (!$bad_urandom) {
3493         # First try /dev/urandom, unless we have marked it as bad
3494         $SIG{ALRM} = "miniserv::urandom_timeout";
3495         alarm(5);
3496         if (open(RANDOM, "/dev/urandom")) {
3497                 my $tmpsid;
3498                 if (read(RANDOM, $tmpsid, 16) == 16) {
3499                         $sid = lc(unpack('h*',$tmpsid));
3500                         }
3501                 close(RANDOM);
3502                 }
3503         alarm(0);
3504         }
3505 if (!$sid && !$force_urandom) {
3506         $sid = time();
3507         local $mul = 1;
3508         foreach $c (split(//, &unix_crypt($pass, substr($$, -2)))) {
3509                 $sid += ord($c) * $mul;
3510                 $mul *= 3;
3511                 }
3512         }
3513 return $sid;
3514 }
3515
3516 # handle_login(username, ok, expired, not-exists, password, [no-test-cookie])
3517 # Called from handle_session to either mark a user as logged in, or not
3518 sub handle_login
3519 {
3520 local ($vu, $ok, $expired, $nonexist, $pass, $notest) = @_;
3521 $authuser = $vu if ($ok);
3522
3523 # check if the test cookie is set
3524 if ($header{'cookie'} !~ /testing=1/ && $vu &&
3525     !$config{'no_testing_cookie'} && !$notest) {
3526         &http_error(500, "No cookies",
3527            "Your browser does not support cookies, ".
3528            "which are required for this web server to ".
3529            "work in session authentication mode");
3530         }
3531
3532 # check with main process for delay
3533 if ($config{'passdelay'} && $vu) {
3534         print $PASSINw "delay $vu $acptip $ok\n";
3535         <$PASSOUTr> =~ /(\d+) (\d+)/;
3536         $blocked = $2;
3537         sleep($1);
3538         }
3539
3540 if ($ok && (!$expired ||
3541             $config{'passwd_mode'} == 1)) {
3542         # Logged in OK! Tell the main process about
3543         # the new SID
3544         local $sid = &generate_random_id($pass);
3545         print $PASSINw "new $sid $authuser $acptip\n";
3546
3547         # Run the post-login script, if any
3548         &run_login_script($authuser, $sid,
3549                           $acptip, $localip);
3550
3551         # Check for a redirect URL for the user
3552         local $rurl = &login_redirect($authuser, $pass, $host);
3553         if ($rurl) {
3554                 # Got one .. go to it
3555                 &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
3556                 &write_data("Date: $datestr\r\n");
3557                 &write_data("Server: $config{'server'}\r\n");
3558                 &write_data("Location: $rurl\r\n");
3559                 &write_keep_alive(0);
3560                 &write_data("\r\n");
3561                 &log_request($acpthost, $authuser, $reqline, 302, 0);
3562                 }
3563         else {
3564                 # Set cookie and redirect to originally requested page
3565                 &write_data("HTTP/1.0 302 Moved Temporarily\r\n");
3566                 &write_data("Date: $datestr\r\n");
3567                 &write_data("Server: $config{'server'}\r\n");
3568                 local $ssl = $use_ssl || $config{'inetd_ssl'};
3569                 $portstr = $port == 80 && !$ssl ? "" :
3570                            $port == 443 && $ssl ? "" : ":$port";
3571                 $prot = $ssl ? "https" : "http";
3572                 local $sec = $ssl ? "; secure" : "";
3573                 #$sec .= "; httpOnly";
3574                 if ($in{'page'} !~ /^\/[A-Za-z0-9\/\.\-\_]+$/) {
3575                         # Make redirect URL safe
3576                         $in{'page'} = "/";
3577                         }
3578                 if ($in{'save'}) {
3579                         &write_data("Set-Cookie: $sidname=$sid; path=/; expires=\"Thu, 31-Dec-2037 00:00:00\"$sec\r\n");
3580                         }
3581                 else {
3582                         &write_data("Set-Cookie: $sidname=$sid; path=/$sec\r\n");
3583                         }
3584                 &write_data("Location: $prot://$host$portstr$in{'page'}\r\n");
3585                 &write_keep_alive(0);
3586                 &write_data("\r\n");
3587                 &log_request($acpthost, $authuser, $reqline, 302, 0);
3588                 syslog("info", "%s", "Successful login as $authuser from $acpthost") if ($use_syslog);
3589                 &write_login_utmp($authuser, $acpthost);
3590                 }
3591         return 0;
3592         }
3593 elsif ($ok && $expired &&
3594        ($config{'passwd_mode'} == 2 || $expired == 2)) {
3595         # Login was ok, but password has expired or was temporary. Need
3596         # to force display of password change form.
3597         $validated = 1;
3598         $authuser = undef;
3599         $querystring = "&user=".&urlize($vu).
3600                        "&pam=".$use_pam.
3601                        "&expired=".$expired;
3602         $method = "GET";
3603         $queryargs = "";
3604         $page = $config{'password_form'};
3605         $logged_code = 401;
3606         $miniserv_internal = 2;
3607         syslog("crit", "%s",
3608                 "Expired login as $vu ".
3609                 "from $acpthost") if ($use_syslog);
3610         }
3611 else {
3612         # Login failed, or password has expired. The login form will be
3613         # displayed again by later code
3614         $failed_user = $vu;
3615         $request_uri = $in{'page'};
3616         $already_session_id = undef;
3617         $method = "GET";
3618         $authuser = $baseauthuser = undef;
3619         syslog("crit", "%s",
3620                 ($nonexist ? "Non-existent" :
3621                  $expired ? "Expired" : "Invalid").
3622                 " login as $vu from $acpthost")
3623                 if ($use_syslog);
3624         }
3625 return undef;
3626 }
3627
3628 # write_login_utmp(user, host)
3629 # Record the login by some user in utmp
3630 sub write_login_utmp
3631 {
3632 if ($write_utmp) {
3633         # Write utmp record for login
3634         %utmp = ( 'ut_host' => $_[1],
3635                   'ut_time' => time(),
3636                   'ut_user' => $_[0],
3637                   'ut_type' => 7,       # user process
3638                   'ut_pid' => $main_process_id,
3639                   'ut_line' => $config{'pam'},
3640                   'ut_id' => '' );
3641         if (defined(&User::Utmp::putut)) {
3642                 User::Utmp::putut(\%utmp);
3643                 }
3644         else {
3645                 User::Utmp::pututline(\%utmp);
3646                 }
3647         }
3648 }
3649
3650 # write_logout_utmp(user, host)
3651 # Record the logout by some user in utmp
3652 sub write_logout_utmp
3653 {
3654 if ($write_utmp) {
3655         # Write utmp record for logout
3656         %utmp = ( 'ut_host' => $_[1],
3657                   'ut_time' => time(),
3658                   'ut_user' => $_[0],
3659                   'ut_type' => 8,       # dead process
3660                   'ut_pid' => $main_process_id,
3661                   'ut_line' => $config{'pam'},
3662                   'ut_id' => '' );
3663         if (defined(&User::Utmp::putut)) {
3664                 User::Utmp::putut(\%utmp);
3665                 }
3666         else {
3667                 User::Utmp::pututline(\%utmp);
3668                 }
3669         }
3670 }
3671
3672 # pam_conversation_process(username, write-pipe, read-pipe)
3673 # This function is called inside a sub-process to communicate with PAM. It sends
3674 # questions down one pipe, and reads responses from another
3675 sub pam_conversation_process
3676 {
3677 local ($user, $writer, $reader) = @_;
3678 $miniserv::pam_conversation_process_writer = $writer;
3679 $miniserv::pam_conversation_process_reader = $reader;
3680 eval "use Authen::PAM;";
3681 local $convh = new Authen::PAM(
3682         $config{'pam'}, $user, \&miniserv::pam_conversation_process_func);
3683 local $pam_ret = $convh->pam_authenticate();
3684 if ($pam_ret == PAM_SUCCESS()) {
3685         local $acct_ret = $convh->pam_acct_mgmt();
3686         if ($acct_ret == PAM_SUCCESS()) {
3687                 $convh->pam_open_session();
3688                 print $writer "x2 $user 1 0 0\n";
3689                 }
3690         elsif ($acct_ret == PAM_NEW_AUTHTOK_REQD() ||
3691                $acct_ret == PAM_ACCT_EXPIRED()) {
3692                 print $writer "x2 $user 1 1 0\n";
3693                 }
3694         else {
3695                 print $writer "x0 Unknown PAM account status $acct_ret\n";
3696                 }
3697         }
3698 else {
3699         print $writer "x2 $user 0 0 0\n";
3700         }
3701 exit(0);
3702 }
3703
3704 # pam_conversation_process_func(type, message, [type, message, ...])
3705 # A pipe that talks to both PAM and the master process
3706 sub pam_conversation_process_func
3707 {
3708 local @rv;
3709 select($miniserv::pam_conversation_process_writer); $| = 1; select(STDOUT);
3710 while(@_) {
3711         local ($type, $msg) = (shift, shift);
3712         $msg =~ s/\r|\n//g;
3713         local $ok = (print $miniserv::pam_conversation_process_writer "$type $msg\n");
3714         print $miniserv::pam_conversation_process_writer "\n";
3715         local $answer = <$miniserv::pam_conversation_process_reader>;
3716         $answer =~ s/\r|\n//g;
3717         push(@rv, PAM_SUCCESS(), $answer);
3718         }
3719 push(@rv, PAM_SUCCESS());
3720 return @rv;
3721 }
3722
3723 # allocate_pipes()
3724 # Returns 4 new pipe file handles
3725 sub allocate_pipes
3726 {
3727 local ($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw);
3728 local $p;
3729 local %taken = ( (map { $_, 1 } @passin),
3730                  (map { $_->{'PASSINr'} } values %conversations) );
3731 for($p=0; $taken{"PASSINr$p"}; $p++) { }
3732 $PASSINr = "PASSINr$p";
3733 $PASSINw = "PASSINw$p";
3734 $PASSOUTr = "PASSOUTr$p";
3735 $PASSOUTw = "PASSOUTw$p";
3736 pipe($PASSINr, $PASSINw);
3737 pipe($PASSOUTr, $PASSOUTw);
3738 select($PASSINw); $| = 1;
3739 select($PASSINr); $| = 1;
3740 select($PASSOUTw); $| = 1;
3741 select($PASSOUTw); $| = 1;
3742 select(STDOUT);
3743 return ($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw);
3744 }
3745
3746 # recv_pam_question(&conv, fd)
3747 # Reads one PAM question from the sub-process, and sends it to the HTTP handler.
3748 # Returns 0 if the conversation is over, 1 if not.
3749 sub recv_pam_question
3750 {
3751 local ($conf, $fh) = @_;
3752 local $pr = $conf->{'PAMOUTr'};
3753 select($pr); $| = 1; select(STDOUT);
3754 local $line = <$pr>;
3755 $line =~ s/\r|\n//g;
3756 if (!$line) {
3757         $line = <$pr>;
3758         $line =~ s/\r|\n//g;
3759         }
3760 $conf->{'last'} = time();
3761 if (!$line) {
3762         # Failed!
3763         print $fh "0 PAM conversation error\n";
3764         return 0;
3765         }
3766 else {
3767         local ($type, $msg) = split(/\s+/, $line, 2);
3768         if ($type =~ /^x(\d+)/) {
3769                 # Pass this status code through
3770                 print $fh "$1 $msg\n";
3771                 return $1 == 2 || $1 == 0 ? 0 : 1;
3772                 }
3773         elsif ($type == PAM_PROMPT_ECHO_ON()) {
3774                 # A normal question
3775                 print $fh "1 $msg\n";
3776                 return 1;
3777                 }
3778         elsif ($type == PAM_PROMPT_ECHO_OFF()) {
3779                 # A password
3780                 print $fh "3 $msg\n";
3781                 return 1;
3782                 }
3783         elsif ($type == PAM_ERROR_MSG() || $type == PAM_TEXT_INFO()) {
3784                 # A message that does not require a response
3785                 print $fh "4 $msg\n";
3786                 return 1;
3787                 }
3788         else {
3789                 # Unknown type!
3790                 print $fh "0 Unknown PAM message type $type\n";
3791                 return 0;
3792                 }
3793         }
3794 }
3795
3796 # send_pam_answer(&conv, answer)
3797 # Sends a response from the user to the PAM sub-process
3798 sub send_pam_answer
3799 {
3800 local ($conf, $answer) = @_;
3801 local $pw = $conf->{'PAMINw'};
3802 $conf->{'last'} = time();
3803 print $pw "$answer\n";
3804 }
3805
3806 # end_pam_conversation(&conv)
3807 # Clean up PAM conversation pipes and processes
3808 sub end_pam_conversation
3809 {
3810 local ($conv) = @_;
3811 kill('KILL', $conv->{'pid'}) if ($conv->{'pid'});
3812 if ($conv->{'PAMINr'}) {
3813         close($conv->{'PAMINr'});
3814         close($conv->{'PAMOUTr'});
3815         close($conv->{'PAMINw'});
3816         close($conv->{'PAMOUTw'});
3817         }
3818 delete($conversations{$conv->{'cid'}});
3819 }
3820
3821 # get_ipkeys(&miniserv)
3822 # Returns a list of IP address to key file mappings from a miniserv.conf entry
3823 sub get_ipkeys
3824 {
3825 local (@rv, $k);
3826 foreach $k (keys %{$_[0]}) {
3827         if ($k =~ /^ipkey_(\S+)/) {
3828                 local $ipkey = { 'ips' => [ split(/,/, $1) ],
3829                                  'key' => $_[0]->{$k},
3830                                  'index' => scalar(@rv) };
3831                 $ipkey->{'cert'} = $_[0]->{'ipcert_'.$1};
3832                 push(@rv, $ipkey);
3833                 }
3834         }
3835 return @rv;
3836 }
3837
3838 # create_ssl_context(keyfile, [certfile])
3839 sub create_ssl_context
3840 {
3841 local ($keyfile, $certfile) = @_;
3842 local $ssl_ctx;
3843 eval { $ssl_ctx = Net::SSLeay::new_x_ctx() };
3844 $ssl_ctx ||= Net::SSLeay::CTX_new();
3845 $ssl_ctx || die "Failed to create SSL context : $!";
3846 if ($client_certs) {
3847         Net::SSLeay::CTX_load_verify_locations(
3848                 $ssl_ctx, $config{'ca'}, "");
3849         Net::SSLeay::CTX_set_verify(
3850                 $ssl_ctx, &Net::SSLeay::VERIFY_PEER, \&verify_client);
3851         }
3852 if ($config{'extracas'}) {
3853         local $p;
3854         foreach $p (split(/\s+/, $config{'extracas'})) {
3855                 Net::SSLeay::CTX_load_verify_locations(
3856                         $ssl_ctx, $p, "");
3857                 }
3858         }
3859
3860 Net::SSLeay::CTX_use_RSAPrivateKey_file(
3861         $ssl_ctx, $keyfile,
3862         &Net::SSLeay::FILETYPE_PEM) || die "Failed to open SSL key $keyfile";
3863 Net::SSLeay::CTX_use_certificate_file(
3864         $ssl_ctx, $certfile || $keyfile,
3865         &Net::SSLeay::FILETYPE_PEM) || die "Failed to open SSL cert $certfile";
3866
3867 return $ssl_ctx;
3868 }
3869
3870 # ssl_connection_for_ip(socket)
3871 # Returns a new SSL connection object for some socket, or undef if failed
3872 sub ssl_connection_for_ip
3873 {
3874 local ($sock) = @_;
3875 local $sn = getsockname($sock);
3876 if (!$sn) {
3877         print STDERR "Failed to get address for socket $sock\n";
3878         return undef;
3879         }
3880 local $myip = inet_ntoa((unpack_sockaddr_in($sn))[1]);
3881 local $ssl_ctx = $ssl_contexts{$myip} || $ssl_contexts{"*"};
3882 local $ssl_con = Net::SSLeay::new($ssl_ctx);
3883 if ($config{'ssl_cipher_list'}) {
3884         # Force use of ciphers
3885         eval "Net::SSLeay::set_cipher_list(
3886                         \$ssl_con, \$config{'ssl_cipher_list'})";
3887         if ($@) {
3888                 print STDERR "SSL cipher $config{'ssl_cipher_list'} failed : ",
3889                              "$@\n";
3890                 }
3891         else {
3892                 }
3893         }
3894 Net::SSLeay::set_fd($ssl_con, fileno($sock));
3895 if (!Net::SSLeay::accept($ssl_con)) {
3896         print STDERR "Failed to initialize SSL connection\n";
3897         return undef;
3898         }
3899 return $ssl_con;
3900 }
3901
3902 # login_redirect(username, password, host)
3903 # Calls the login redirect script (if configured), which may output a URL to
3904 # re-direct a user to after logging in.
3905 sub login_redirect
3906 {
3907 return undef if (!$config{'login_redirect'});
3908 local $quser = quotemeta($_[0]);
3909 local $qpass = quotemeta($_[1]);
3910 local $qhost = quotemeta($_[2]);
3911 local $url = `$config{'login_redirect'} $quser $qpass $qhost`;
3912 chop($url);
3913 return $url;
3914 }
3915
3916 # reload_config_file()
3917 # Re-read %config, and call post-config actions
3918 sub reload_config_file
3919 {
3920 &log_error("Reloading configuration");
3921 %config = &read_config_file($config_file);
3922 &update_vital_config();
3923 &read_users_file();
3924 &read_mime_types();
3925 &build_config_mappings();
3926 &read_webmin_crons();
3927 if ($config{'session'}) {
3928         dbmclose(%sessiondb);
3929         dbmopen(%sessiondb, $config{'sessiondb'}, 0700);
3930         }
3931 }
3932
3933 # read_config_file(file)
3934 # Reads the given config file, and returns a hash of values
3935 sub read_config_file
3936 {
3937 local %rv;
3938 open(CONF, $_[0]) || die "Failed to open config file $_[0] : $!";
3939 while(<CONF>) {
3940         s/\r|\n//g;
3941         if (/^#/ || !/\S/) { next; }
3942         /^([^=]+)=(.*)$/;
3943         $name = $1; $val = $2;
3944         $name =~ s/^\s+//g; $name =~ s/\s+$//g;
3945         $val =~ s/^\s+//g; $val =~ s/\s+$//g;
3946         $rv{$name} = $val;
3947         }
3948 close(CONF);
3949 return %rv;
3950 }
3951
3952 # update_vital_config()
3953 # Updates %config with defaults, and dies if something vital is missing
3954 sub update_vital_config
3955 {
3956 my %vital = ("port", 80,
3957           "root", "./",
3958           "server", "MiniServ/0.01",
3959           "index_docs", "index.html index.htm index.cgi index.php",
3960           "addtype_html", "text/html",
3961           "addtype_txt", "text/plain",
3962           "addtype_gif", "image/gif",
3963           "addtype_jpg", "image/jpeg",
3964           "addtype_jpeg", "image/jpeg",
3965           "realm", "MiniServ",
3966           "session_login", "/session_login.cgi",
3967           "pam_login", "/pam_login.cgi",
3968           "password_form", "/password_form.cgi",
3969           "password_change", "/password_change.cgi",
3970           "maxconns", 50,
3971           "pam", "webmin",
3972           "sidname", "sid",
3973           "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\$",
3974           "max_post", 10000,
3975           "expires", 7*24*60*60,
3976           "pam_test_user", "root",
3977          );
3978 foreach my $v (keys %vital) {
3979         if (!$config{$v}) {
3980                 if ($vital{$v} eq "") {
3981                         die "Missing config option $v";
3982                         }
3983                 $config{$v} = $vital{$v};
3984                 }
3985         }
3986 if (!$config{'sessiondb'}) {
3987         $config{'pidfile'} =~ /^(.*)\/[^\/]+$/;
3988         $config{'sessiondb'} = "$1/sessiondb";
3989         }
3990 if (!$config{'errorlog'}) {
3991         $config{'logfile'} =~ /^(.*)\/[^\/]+$/;
3992         $config{'errorlog'} = "$1/miniserv.error";
3993         }
3994 if (!$config{'tempbase'}) {
3995         $config{'pidfile'} =~ /^(.*)\/[^\/]+$/;
3996         $config{'tempbase'} = "$1/cgitemp";
3997         }
3998 if (!$config{'blockedfile'}) {
3999         $config{'pidfile'} =~ /^(.*)\/[^\/]+$/;
4000         $config{'blockedfile'} = "$1/blocked";
4001         }
4002 if (!$config{'webmincron_dir'}) {
4003         $config_file =~ /^(.*)\/[^\/]+$/;
4004         $config{'webmincron_dir'} = "$1/webmincron/crons";
4005         }
4006 if (!$config{'webmincron_last'}) {
4007         $config{'logfile'} =~ /^(.*)\/[^\/]+$/;
4008         $config{'webmincron_last'} = "$1/miniserv.lastcrons";
4009         }
4010 if (!$config{'webmincron_wrapper'}) {
4011         $config{'webmincron_wrapper'} = $config{'root'}.
4012                                         "/webmincron/webmincron.pl";
4013         }
4014 }
4015
4016 # read_users_file()
4017 # Fills the %users and %certs hashes from the users file in %config
4018 sub read_users_file
4019 {
4020 undef(%users);
4021 undef(%certs);
4022 undef(%allow);
4023 undef(%deny);
4024 undef(%allowdays);
4025 undef(%allowhours);
4026 undef(%lastchanges);
4027 undef(%nochange);
4028 undef(%temppass);
4029 if ($config{'userfile'}) {
4030         open(USERS, $config{'userfile'});
4031         while(<USERS>) {
4032                 s/\r|\n//g;
4033                 local @user = split(/:/, $_, -1);
4034                 $users{$user[0]} = $user[1];
4035                 $certs{$user[0]} = $user[3] if ($user[3]);
4036                 if ($user[4] =~ /^allow\s+(.*)/) {
4037                         $allow{$user[0]} = $config{'alwaysresolve'} ?
4038                                 [ split(/\s+/, $1) ] :
4039                                 [ &to_ipaddress(split(/\s+/, $1)) ];
4040                         }
4041                 elsif ($user[4] =~ /^deny\s+(.*)/) {
4042                         $deny{$user[0]} = $config{'alwaysresolve'} ?
4043                                 [ split(/\s+/, $1) ] :
4044                                 [ &to_ipaddress(split(/\s+/, $1)) ];
4045                         }
4046                 if ($user[5] =~ /days\s+(\S+)/) {
4047                         $allowdays{$user[0]} = [ split(/,/, $1) ];
4048                         }
4049                 if ($user[5] =~ /hours\s+(\d+)\.(\d+)-(\d+).(\d+)/) {
4050                         $allowhours{$user[0]} = [ $1*60+$2, $3*60+$4 ];
4051                         }
4052                 $lastchanges{$user[0]} = $user[6];
4053                 $nochange{$user[0]} = $user[9];
4054                 $temppass{$user[0]} = $user[10];
4055                 }
4056         close(USERS);
4057         }
4058
4059 # Test user DB, if configured
4060 if ($config{'userdb'}) {
4061         my $dbh = &connect_userdb($config{'userdb'});
4062         if (!ref($dbh)) {
4063                 print STDERR "Failed to open users database : $dbh\n"
4064                 }
4065         else {
4066                 &disconnect_userdb($config{'userdb'}, $dbh);
4067                 }
4068         }
4069 }
4070
4071 # get_user_details(username)
4072 # Returns a hash ref of user details, either from config files or the user DB
4073 sub get_user_details
4074 {
4075 my ($username) = @_;
4076 if (exists($users{$username})) {
4077         # In local files
4078         return { 'name' => $username,
4079                  'pass' => $users{$username},
4080                  'certs' => $certs{$username},
4081                  'allow' => $allow{$username},
4082                  'deny' => $deny{$username},
4083                  'allowdays' => $allowdays{$username},
4084                  'allowhours' => $allowhours{$username},
4085                  'lastchanges' => $lastchanges{$username},
4086                  'nochange' => $nochange{$username},
4087                  'temppass' => $temppass{$username},
4088                };
4089         }
4090 if ($config{'userdb'}) {
4091         # Try querying user database
4092         if (exists($get_user_details_cache{$username})) {
4093                 # Cached already
4094                 return $get_user_details_cache{$username};
4095                 }
4096         print DEBUG "get_user_details: Connecting to user database\n";
4097         my ($dbh, $proto) = &connect_userdb($config{'userdb'});
4098         my $user;
4099         if (!ref($dbh)) {
4100                 print DEBUG "get_user_details: Failed : $dbh\n";
4101                 print STDERR "Failed to connect to user database : $dbh\n";
4102                 }
4103         elsif ($proto eq "mysql" || $proto eq "postgresql") {
4104                 # Fetch user ID and password with SQL
4105                 print DEBUG "get_user_details: Looking for $username\n";
4106                 my $cmd = $dbh->prepare(
4107                         "select id,pass from webmin_user where name = ?");
4108                 if (!$cmd || !$cmd->execute($username)) {
4109                         print STDERR "Failed to lookup user : ",
4110                                      $dbh->errstr,"\n";
4111                         return undef;
4112                         }
4113                 my ($id, $pass) = $cmd->fetchrow();
4114                 $cmd->finish();
4115                 if (!$id) {
4116                         &disconnect_userdb($config{'userdb'}, $dbh);
4117                         $get_user_details_cache{$username} = undef;
4118                         print DEBUG "get_user_details: User not found\n";
4119                         return undef;
4120                         }
4121                 print DEBUG "get_user_details: id=$id pass=$pass\n";
4122
4123                 # Fetch attributes and add to user object
4124                 print DEBUG "get_user_details: finding user attributes\n";
4125                 my $cmd = $dbh->prepare(
4126                         "select attr,value from webmin_user_attr where id = ?");
4127                 if (!$cmd || !$cmd->execute($id)) {
4128                         print STDERR "Failed to lookup user attrs : ",
4129                                      $dbh->errstr,"\n";
4130                         return undef;
4131                         }
4132                 $user = { 'name' => $username,
4133                           'id' => $id,
4134                           'pass' => $pass,
4135                           'proto' => $proto };
4136                 my %attrs;
4137                 while(my ($attr, $value) = $cmd->fetchrow()) {
4138                         $attrs{$attr} = $value;
4139                         }
4140                 print DEBUG "get_user_details: got ",scalar(keys %attrs),
4141                             " attributes\n";
4142                 $cmd->finish();
4143                 $user->{'certs'} = $attrs{'cert'};
4144                 if ($attrs{'allow'}) {
4145                         $user->{'allow'} = $config{'alwaysresolve'} ?
4146                                 [ split(/\s+/, $attrs{'allow'}) ] :
4147                                 [ &to_ipaddress(split(/\s+/,$attrs{'allow'})) ];
4148                         }
4149                 if ($attrs{'deny'}) {
4150                         $user->{'deny'} = $config{'alwaysresolve'} ?
4151                                 [ split(/\s+/, $attrs{'deny'}) ] :
4152                                 [ &to_ipaddress(split(/\s+/,$attrs{'deny'})) ];
4153                         }
4154                 if ($attrs{'days'}) {
4155                         $user->{'allowdays'} = [ split(/,/, $attrs{'days'}) ];
4156                         }
4157                 if ($attrs{'hoursfrom'} && $attrs{'hoursto'}) {
4158                         my ($hf, $mf) = split(/\./, $attrs{'hoursfrom'});
4159                         my ($ht, $mt) = split(/\./, $attrs{'hoursto'});
4160                         $user->{'allowhours'} = [ $hf*60+$ht, $ht*60+$mt ];
4161                         }
4162                 $user->{'lastchanges'} = $attrs{'lastchange'};
4163                 $user->{'nochange'} = $attrs{'nochange'};
4164                 $user->{'temppass'} = $attrs{'temppass'};
4165                 }
4166         elsif ($proto eq "ldap") {
4167                 # Fetch with LDAP
4168                 # XXX
4169                 }
4170         &disconnect_userdb($config{'userdb'}, $dbh);
4171         $get_user_details_cache{$user->{'name'}} = $user;
4172         return $user;
4173         }
4174 return undef;
4175 }
4176
4177 # find_user_by_cert(cert)
4178 # Returns a username looked up by certificate
4179 sub find_user_by_cert
4180 {
4181 my ($peername) = @_;
4182 my $peername2 = $peername;
4183 $peername2 =~ s/Email=/emailAddress=/ || $peername2 =~ s/emailAddress=/Email=/;
4184
4185 # First check users in local files
4186 foreach my $username (keys %certs) {
4187         if ($certs{$username} eq $peername ||
4188             $certs{$username} eq $peername2) {
4189                 return $username;
4190                 }
4191         }
4192
4193 # Check user DB
4194 if ($config{'userdb'}) {
4195         my ($dbh, $proto) = &connect_userdb($config{'userdb'});
4196         if (!ref($dbh)) {
4197                 return undef;
4198                 }
4199         elsif ($proto eq "mysql" || $proto eq "postgresql") {
4200                 # Query with SQL
4201                 my $cmd = $dbh->prepare("select webmin_user.name from webmin_user,webmin_user_attr where webmin_user.id = webmin_user_attr.id and webmin_user_attr.attr = 'cert' and webmin_user_attr.value = ?");
4202                 return undef if (!$cmd);
4203                 foreach my $p ($peername, $peername2) {
4204                         my $username;
4205                         if ($cmd->execute($p)) {
4206                                 ($username) = $cmd->fetchrow();
4207                                 }
4208                         $cmd->finish();
4209                         return $username if ($username);
4210                         }
4211                 }
4212         elsif ($proto eq "ldap") {
4213                 # Lookup in LDAP
4214                 # XXX
4215                 }
4216         }
4217 return undef;
4218 }
4219
4220 # connect_userdb(string)
4221 # Returns a handle for talking to a user database - may be a DBI or LDAP handle.
4222 # On failure returns an error message string. In an array context, returns the
4223 # protocol type too.
4224 sub connect_userdb
4225 {
4226 my ($str) = @_;
4227 my ($proto, $user, $pass, $host, $prefix, $args) = &split_userdb_string($str);
4228 if ($proto eq "mysql") {
4229         # Connect to MySQL with DBI
4230         my $drh = eval "use DBI; DBI->install_driver('mysql');";
4231         $drh || return $text{'sql_emysqldriver'};
4232         my ($host, $port) = split(/:/, $host);
4233         my $cstr = "database=$prefix;host=$host";
4234         $cstr .= ";port=$port" if ($port);
4235         print DEBUG "connect_userdb: Connecting to MySQL $cstr as $user\n";
4236         my $dbh = $drh->connect($cstr, $user, $pass, { });
4237         $dbh || return &text('sql_emysqlconnect', $drh->errstr);
4238         print DEBUG "connect_userdb: Connected OK\n";
4239         return wantarray ? ($dbh, $proto) : $dbh;
4240         }
4241 elsif ($proto eq "postgresql") {
4242         # Connect to PostgreSQL with DBI
4243         my $drh = eval "use DBI; DBI->install_driver('Pg');";
4244         $drh || return $text{'sql_epostgresqldriver'};
4245         my ($host, $port) = split(/:/, $host);
4246         my $cstr = "dbname=$prefix;host=$host";
4247         $cstr .= ";port=$port" if ($port);
4248         print DEBUG "connect_userdb: Connecting to PostgreSQL $cstr as $user\n";
4249         my $dbh = $drh->connect($cstr, $user, $pass);
4250         $dbh || return &text('sql_epostgresqlconnect', $drh->errstr);
4251         print DEBUG "connect_userdb: Connected OK\n";
4252         return wantarray ? ($dbh, $proto) : $dbh;
4253         }
4254 elsif ($proto eq "ldap") {
4255         # XXX
4256         return "LDAP not done yet";
4257         }
4258 else {
4259         return "Unknown protocol $proto";
4260         }
4261 }
4262
4263 # split_userdb_string(string)
4264 # Converts a string like mysql://user:pass@host/db into separate parts
4265 sub split_userdb_string
4266 {
4267 my ($str) = @_;
4268 if ($str =~ /^([a-z]+):\/\/([^:]*):([^\@]*)\@([a-z0-9\.\-\_]+)\/([^\?]+)(\?(.*))?$/) {
4269         my ($proto, $user, $pass, $host, $prefix, $argstr) =
4270                 ($1, $2, $3, $4, $5, $7);
4271         my %args = map { split(/=/, $_, 2) } split(/\&/, $argstr);
4272         return ($proto, $user, $pass, $host, $prefix, \%args);
4273         }
4274 return ( );
4275 }
4276
4277 # disconnect_userdb(string, &handle)
4278 # Closes a handle opened by connect_userdb
4279 sub disconnect_userdb
4280 {
4281 my ($str, $h) = @_;
4282 if ($str =~ /^(mysql|postgresql):/) {
4283         # DBI disconnnect
4284         $h->disconnect();
4285         }
4286 elsif ($str =~ /^ldap:/) {
4287         # LDAP disconnect
4288         $h->disconnect();
4289         }
4290 }
4291
4292 # read_mime_types()
4293 # Fills %mime with entries from file in %config and extra settings in %config
4294 sub read_mime_types
4295 {
4296 undef(%mime);
4297 if ($config{"mimetypes"} ne "") {
4298         open(MIME, $config{"mimetypes"});
4299         while(<MIME>) {
4300                 chop; s/#.*$//;
4301                 if (/^(\S+)\s+(.*)$/) {
4302                         my $type = $1;
4303                         my @exts = split(/\s+/, $2);
4304                         foreach my $ext (@exts) {
4305                                 $mime{$ext} = $type;
4306                                 }
4307                         }
4308                 }
4309         close(MIME);
4310         }
4311 foreach my $k (keys %config) {
4312         if ($k !~ /^addtype_(.*)$/) { next; }
4313         $mime{$1} = $config{$k};
4314         }
4315 }
4316
4317 # build_config_mappings()
4318 # Build the anonymous access list, IP access list, unauthenticated URLs list,
4319 # redirect mapping and allow and deny lists from %config
4320 sub build_config_mappings
4321 {
4322 # build anonymous access list
4323 undef(%anonymous);
4324 foreach my $a (split(/\s+/, $config{'anonymous'})) {
4325         if ($a =~ /^([^=]+)=(\S+)$/) {
4326                 $anonymous{$1} = $2;
4327                 }
4328         }
4329
4330 # build IP access list
4331 undef(%ipaccess);
4332 foreach my $a (split(/\s+/, $config{'ipaccess'})) {
4333         if ($a =~ /^([^=]+)=(\S+)$/) {
4334                 $ipaccess{$1} = $2;
4335                 }
4336         }
4337
4338 # build unauthenticated URLs list
4339 @unauth = split(/\s+/, $config{'unauth'});
4340
4341 # build redirect mapping
4342 undef(%redirect);
4343 foreach my $r (split(/\s+/, $config{'redirect'})) {
4344         if ($r =~ /^([^=]+)=(\S+)$/) {
4345                 $redirect{$1} = $2;
4346                 }
4347         }
4348
4349 # build prefixes to be stripped
4350 undef(@strip_prefix);
4351 foreach my $r (split(/\s+/, $config{'strip_prefix'})) {
4352         push(@strip_prefix, $r);
4353         }
4354
4355 # Init allow and deny lists
4356 @deny = split(/\s+/, $config{"deny"});
4357 @deny = &to_ipaddress(@deny) if (!$config{'alwaysresolve'});
4358 @allow = split(/\s+/, $config{"allow"});
4359 @allow = &to_ipaddress(@allow) if (!$config{'alwaysresolve'});
4360 undef(@allowusers);
4361 undef(@denyusers);
4362 if ($config{'allowusers'}) {
4363         @allowusers = split(/\s+/, $config{'allowusers'});
4364         }
4365 elsif ($config{'denyusers'}) {
4366         @denyusers = split(/\s+/, $config{'denyusers'});
4367         }
4368
4369 # Build list of unixauth mappings
4370 undef(%unixauth);
4371 foreach my $ua (split(/\s+/, $config{'unixauth'})) {
4372         if ($ua =~ /^(\S+)=(\S+)$/) {
4373                 $unixauth{$1} = $2;
4374                 }
4375         else {
4376                 $unixauth{"*"} = $ua;
4377                 }
4378         }
4379
4380 # Build list of non-session-auth pages
4381 undef(%sessiononly);
4382 foreach my $sp (split(/\s+/, $config{'sessiononly'})) {
4383         $sessiononly{$sp} = 1;
4384         }
4385
4386 # Build list of logout times
4387 undef(@logouttimes);
4388 foreach my $a (split(/\s+/, $config{'logouttimes'})) {
4389         if ($a =~ /^([^=]+)=(\S+)$/) {
4390                 push(@logouttimes, [ $1, $2 ]);
4391                 }
4392         }
4393 push(@logouttimes, [ undef, $config{'logouttime'} ]);
4394
4395 # Build list of DAV pathss
4396 undef(@davpaths);
4397 foreach my $d (split(/\s+/, $config{'davpaths'})) {
4398         push(@davpaths, $d);
4399         }
4400 @davusers = split(/\s+/, $config{'dav_users'});
4401
4402 # Mobile agent substrings and hostname prefixes
4403 @mobile_agents = split(/\t+/, $config{'mobile_agents'});
4404 @mobile_prefixes = split(/\s+/, $config{'mobile_prefixes'});
4405
4406 # Open debug log
4407 close(DEBUG);
4408 if ($config{'debug'}) {
4409         open(DEBUG, ">>$config{'debug'}");
4410         }
4411 else {
4412         open(DEBUG, ">/dev/null");
4413         }
4414
4415 # Reset cache of sudo checks
4416 undef(%sudocache);
4417 }
4418
4419 # is_group_member(&uinfo, groupname)
4420 # Returns 1 if some user is a primary or secondary member of a group
4421 sub is_group_member
4422 {
4423 local ($uinfo, $group) = @_;
4424 local @ginfo = getgrnam($group);
4425 return 0 if (!@ginfo);
4426 return 1 if ($ginfo[2] == $uinfo->[3]); # primary member
4427 foreach my $m (split(/\s+/, $ginfo[3])) {
4428         return 1 if ($m eq $uinfo->[0]);
4429         }
4430 return 0;
4431 }
4432
4433 # prefix_to_mask(prefix)
4434 # Converts a number like 24 to a mask like 255.255.255.0
4435 sub prefix_to_mask
4436 {
4437 return $_[0] >= 24 ? "255.255.255.".(256-(2 ** (32-$_[0]))) :
4438        $_[0] >= 16 ? "255.255.".(256-(2 ** (24-$_[0]))).".0" :
4439        $_[0] >= 8 ? "255.".(256-(2 ** (16-$_[0]))).".0.0" :
4440                      (256-(2 ** (8-$_[0]))).".0.0.0";
4441 }
4442
4443 # get_logout_time(user, session-id)
4444 # Given a username, returns the idle time before he will be logged out
4445 sub get_logout_time
4446 {
4447 local ($user, $sid) = @_;
4448 if (!defined($logout_time_cache{$user,$sid})) {
4449         local $time;
4450         foreach my $l (@logouttimes) {
4451                 if ($l->[0] =~ /^\@(.*)$/) {
4452                         # Check group membership
4453                         local @uinfo = getpwnam($user);
4454                         if (@uinfo && &is_group_member(\@uinfo, $1)) {
4455                                 $time = $l->[1];
4456                                 }
4457                         }
4458                 elsif ($l->[0] =~ /^\//) {
4459                         # Check file contents
4460                         open(FILE, $l->[0]);
4461                         while(<FILE>) {
4462                                 s/\r|\n//g;
4463                                 s/^\s*#.*$//;
4464                                 if ($user eq $_) {
4465                                         $time = $l->[1];
4466                                         last;
4467                                         }
4468                                 }
4469                         close(FILE);
4470                         }
4471                 elsif (!$l->[0]) {
4472                         # Always match
4473                         $time = $l->[1];
4474                         }
4475                 else {
4476                         # Check username
4477                         if ($l->[0] eq $user) {
4478                                 $time = $l->[1];
4479                                 }
4480                         }
4481                 last if (defined($time));
4482                 }
4483         $logout_time_cache{$user,$sid} = $time;
4484         }
4485 return $logout_time_cache{$user,$sid};
4486 }
4487
4488 # password_crypt(password, salt)
4489 # If the salt looks like MD5 and we have a library for it, perform MD5 hashing
4490 # of a password. Otherwise, do Unix crypt.
4491 sub password_crypt
4492 {
4493 local ($pass, $salt) = @_;
4494 if ($salt =~ /^\$1\$/ && $use_md5) {
4495         return &encrypt_md5($pass, $salt);
4496         }
4497 else {
4498         return &unix_crypt($pass, $salt);
4499         }
4500 }
4501
4502 # unix_crypt(password, salt)
4503 # Performs standard Unix hashing for a password
4504 sub unix_crypt
4505 {
4506 local ($pass, $salt) = @_;
4507 if ($use_perl_crypt) {
4508         return Crypt::UnixCrypt::crypt($pass, $salt);
4509         }
4510 else {
4511         return crypt($pass, $salt);
4512         }
4513 }
4514
4515 # handle_dav_request(davpath)
4516 # Pass a request on to the Net::DAV::Server module
4517 sub handle_dav_request
4518 {
4519 local ($path) = @_;
4520 eval "use Filesys::Virtual::Plain";
4521 eval "use Net::DAV::Server";
4522 eval "use HTTP::Request";
4523 eval "use HTTP::Headers";
4524
4525 if ($Net::DAV::Server::VERSION eq '1.28' && $config{'dav_nolock'}) {
4526         delete $Net::DAV::Server::implemented{lock};
4527         delete $Net::DAV::Server::implemented{unlock};
4528         }
4529
4530 # Read in request data
4531 if (!$posted_data) {
4532         local $clen = $header{"content-length"};
4533         while(length($posted_data) < $clen) {
4534                 $buf = &read_data($clen - length($posted_data));
4535                 if (!length($buf)) {
4536                         &http_error(500, "Failed to read POST request");
4537                         }
4538                 $posted_data .= $buf;
4539                 }
4540         }
4541
4542 # For subsequent logging
4543 open(MINISERVLOG, ">>$config{'logfile'}");
4544
4545 # Switch to user
4546 local $root;
4547 local @u = getpwnam($authuser);
4548 if ($config{'dav_remoteuser'} && !$< && $validated) {
4549         if (@u) {
4550                 if ($u[2] != 0) {
4551                         $( = $u[3]; $) = "$u[3] $u[3]";
4552                         ($>, $<) = ($u[2], $u[2]);
4553                         }
4554                 if ($config{'dav_root'} eq '*') {
4555                         $root = $u[7];
4556                         }
4557                 }
4558         else {
4559                 &http_error(500, "Unix user $authuser does not exist");
4560                 return 0;
4561                 }
4562         }
4563 $root ||= $config{'dav_root'};
4564 $root ||= "/";
4565
4566 # Check if this user can use DAV
4567 if (@davusers) {
4568         &users_match(\@u, @davusers) ||
4569                 &http_error(500, "You are not allowed to access DAV");
4570         }
4571
4572 # Create DAV server
4573 my $filesys = Filesys::Virtual::Plain->new({root_path => $root});
4574 my $webdav = Net::DAV::Server->new();
4575 $webdav->filesys($filesys);
4576
4577 # Make up a request object, and feed to DAV
4578 local $ho = HTTP::Headers->new;
4579 foreach my $h (keys %header) {
4580         next if (lc($h) eq "connection");
4581         $ho->header($h => $header{$h});
4582         }
4583 if ($path ne "/") {
4584         $request_uri =~ s/^\Q$path\E//;
4585         $request_uri = "/" if ($request_uri eq "");
4586         }
4587 my $request = HTTP::Request->new($method, $request_uri, $ho,
4588                                  $posted_data);
4589 if ($config{'dav_debug'}) {
4590         print STDERR "DAV request :\n";
4591         print STDERR "---------------------------------------------\n";
4592         print STDERR $request->as_string();
4593         print STDERR "---------------------------------------------\n";
4594         }
4595 my $response = $webdav->run($request);
4596
4597 # Send back the reply
4598 &write_data("HTTP/1.1 ",$response->code()," ",$response->message(),"\r\n");
4599 local $content = $response->content();
4600 if ($path ne "/") {
4601         $content =~ s|href>/(.+)<|href>$path/$1<|g;
4602         $content =~ s|href>/<|href>$path<|g;
4603         }
4604 foreach my $h ($response->header_field_names) {
4605         next if (lc($h) eq "connection" || lc($h) eq "content-length");
4606         &write_data("$h: ",$response->header($h),"\r\n");
4607         }
4608 &write_data("Content-length: ",length($content),"\r\n");
4609 local $rv = &write_keep_alive(0);
4610 &write_data("\r\n");
4611 &write_data($content);
4612
4613 if ($config{'dav_debug'}) {
4614         print STDERR "DAV reply :\n";
4615         print STDERR "---------------------------------------------\n";
4616         print STDERR "HTTP/1.1 ",$response->code()," ",$response->message(),"\r\n";
4617         foreach my $h ($response->header_field_names) {
4618                 next if (lc($h) eq "connection" || lc($h) eq "content-length");
4619                 print STDERR "$h: ",$response->header($h),"\r\n";
4620                 }
4621         print STDERR "Content-length: ",length($content),"\r\n";
4622         print STDERR "\r\n";
4623         print STDERR $content;
4624         print STDERR "---------------------------------------------\n";
4625         }
4626
4627 # Log it
4628 &log_request($acpthost, $authuser, $reqline, $response->code(),
4629              length($response->content()));
4630 }
4631
4632 # get_system_hostname()
4633 # Returns the hostname of this system, for reporting to listeners
4634 sub get_system_hostname
4635 {
4636 # On Windows, try computername environment variable
4637 return $ENV{'computername'} if ($ENV{'computername'});
4638 return $ENV{'COMPUTERNAME'} if ($ENV{'COMPUTERNAME'});
4639
4640 # If a specific command is set, use it first
4641 if ($config{'hostname_command'}) {
4642         local $out = `($config{'hostname_command'}) 2>&1`;
4643         if (!$?) {
4644                 $out =~ s/\r|\n//g;
4645                 return $out;
4646                 }
4647         }
4648
4649 # First try the hostname command
4650 local $out = `hostname 2>&1`;
4651 if (!$? && $out =~ /\S/) {
4652         $out =~ s/\r|\n//g;
4653         return $out;
4654         }
4655
4656 # Try the Sys::Hostname module
4657 eval "use Sys::Hostname";
4658 if (!$@) {
4659         local $rv = eval "hostname()";
4660         if (!$@ && $rv) {
4661                 return $rv;
4662                 }
4663         }
4664
4665 # Must use net name on Windows
4666 local $out = `net name 2>&1`;
4667 if ($out =~ /\-+\r?\n(\S+)/) {
4668         return $1;
4669         }
4670
4671 return undef;
4672 }
4673
4674 # indexof(string, array)
4675 # Returns the index of some value in an array, or -1
4676 sub indexof {
4677   local($i);
4678   for($i=1; $i <= $#_; $i++) {
4679     if ($_[$i] eq $_[0]) { return $i - 1; }
4680   }
4681   return -1;
4682 }
4683
4684
4685 # has_command(command)
4686 # Returns the full path if some command is in the path, undef if not
4687 sub has_command
4688 {
4689 local($d);
4690 if (!$_[0]) { return undef; }
4691 if (exists($has_command_cache{$_[0]})) {
4692         return $has_command_cache{$_[0]};
4693         }
4694 local $rv = undef;
4695 if ($_[0] =~ /^\//) {
4696         $rv = -x $_[0] ? $_[0] : undef;
4697         }
4698 else {
4699         local $sp = $on_windows ? ';' : ':';
4700         foreach $d (split($sp, $ENV{PATH})) {
4701                 if (-x "$d/$_[0]") {
4702                         $rv = "$d/$_[0]";
4703                         last;
4704                         }
4705                 if ($on_windows) {
4706                         foreach my $sfx (".exe", ".com", ".bat") {
4707                                 if (-r "$d/$_[0]".$sfx) {
4708                                         $rv = "$d/$_[0]".$sfx;
4709                                         last;
4710                                         }
4711                                 }
4712                         }
4713                 }
4714         }
4715 $has_command_cache{$_[0]} = $rv;
4716 return $rv;
4717 }
4718
4719 # check_sudo_permissions(user, pass)
4720 # Returns 1 if some user can run any command via sudo
4721 sub check_sudo_permissions
4722 {
4723 local ($user, $pass) = @_;
4724
4725 # First try the pipes
4726 if ($PASSINw) {
4727         print DEBUG "check_sudo_permissions: querying cache for $user\n";
4728         print $PASSINw "readsudo $user\n";
4729         local $can = <$PASSOUTr>;
4730         chop($can);
4731         print DEBUG "check_sudo_permissions: cache said $can\n";
4732         if ($can =~ /^\d+$/ && $can != 2) {
4733                 return int($can);
4734                 }
4735         }
4736
4737 local $ptyfh = new IO::Pty;
4738 print DEBUG "check_sudo_permissions: ptyfh=$ptyfh\n";
4739 if (!$ptyfh) {
4740         print STDERR "Failed to create new PTY with IO::Pty\n";
4741         return 0;
4742         }
4743 local @uinfo = getpwnam($user);
4744 if (!@uinfo) {
4745         print STDERR "Unix user $user does not exist for sudo\n";
4746         return 0;
4747         }
4748
4749 # Execute sudo in a sub-process, via a pty
4750 local $ttyfh = $ptyfh->slave();
4751 print DEBUG "check_sudo_permissions: ttyfh=$ttyfh\n";
4752 local $tty = $ptyfh->ttyname();
4753 print DEBUG "check_sudo_permissions: tty=$tty\n";
4754 chown($uinfo[2], $uinfo[3], $tty);
4755 pipe(SUDOr, SUDOw);
4756 print DEBUG "check_sudo_permissions: about to fork..\n";
4757 local $pid = fork();
4758 print DEBUG "check_sudo_permissions: fork=$pid pid=$$\n";
4759 if ($pid < 0) {
4760         print STDERR "fork for sudo failed : $!\n";
4761         return 0;
4762         }
4763 if (!$pid) {
4764         setsid();
4765         $ptyfh->make_slave_controlling_terminal();
4766         close(STDIN); close(STDOUT); close(STDERR);
4767         untie(*STDIN); untie(*STDOUT); untie(*STDERR);
4768         close($PASSINw); close($PASSOUTr);
4769         $( = $uinfo[3]; $) = "$uinfo[3] $uinfo[3]";
4770         ($>, $<) = ($uinfo[2], $uinfo[2]);
4771
4772         close(SUDOw);
4773         close(SOCK);
4774         close(MAIN);
4775         open(STDIN, "<&SUDOr");
4776         open(STDOUT, ">$tty");
4777         open(STDERR, ">&STDOUT");
4778         close($ptyfh);
4779         exec("sudo -l -S");
4780         print "Exec failed : $!\n";
4781         exit 1;
4782         }
4783 print DEBUG "check_sudo_permissions: pid=$pid\n";
4784 close(SUDOr);
4785 $ptyfh->close_slave();
4786
4787 # Send password, and get back response
4788 local $oldfh = select(SUDOw);
4789 $| = 1;
4790 select($oldfh);
4791 print DEBUG "check_sudo_permissions: about to send pass\n";
4792 local $SIG{'PIPE'} = 'ignore';  # Sometimes sudo doesn't ask for a password
4793 print SUDOw $pass,"\n";
4794 print DEBUG "check_sudo_permissions: sent pass=$pass\n";
4795 close(SUDOw);
4796 local $out;
4797 while(<$ptyfh>) {
4798         print DEBUG "check_sudo_permissions: got $_";
4799         $out .= $_;
4800         }
4801 close($ptyfh);
4802 kill('KILL', $pid);
4803 waitpid($pid, 0);
4804 local ($ok) = ($out =~ /\(ALL\)\s+ALL/ ? 1 : 0);
4805
4806 # Update cache
4807 if ($PASSINw) {
4808         print $PASSINw "writesudo $user $ok\n";
4809         }
4810
4811 return $ok;
4812 }
4813
4814 # is_mobile_useragent(agent)
4815 # Returns 1 if some user agent looks like a cellphone or other mobile device,
4816 # such as a treo.
4817 sub is_mobile_useragent
4818 {
4819 local ($agent) = @_;
4820 local @prefixes = (
4821     "UP.Link",    # Openwave
4822     "Nokia",      # All Nokias start with Nokia
4823     "MOT-",       # All Motorola phones start with MOT-
4824     "SAMSUNG",    # Samsung browsers
4825     "Samsung",    # Samsung browsers
4826     "SEC-",       # Samsung browsers
4827     "AU-MIC",     # Samsung browsers
4828     "AUDIOVOX",   # Audiovox
4829     "BlackBerry", # BlackBerry
4830     "hiptop",     # Danger hiptop Sidekick
4831     "SonyEricsson", # Sony Ericsson
4832     "Ericsson",     # Old Ericsson browsers , mostly WAP
4833     "Mitsu/1.1.A",  # Mitsubishi phones
4834     "Panasonic WAP", # Panasonic old WAP phones
4835     "DoCoMo",     # DoCoMo phones
4836     "Lynx",       # Lynx text-mode linux browser
4837     "Links",      # Another text-mode linux browser
4838     );
4839 local @substrings = (
4840     "UP.Browser",         # Openwave
4841     "MobilePhone",        # NetFront
4842     "AU-MIC-A700",        # Samsung A700 Obigo browsers
4843     "Danger hiptop",      # Danger Sidekick hiptop
4844     "Windows CE",         # Windows CE Pocket PC
4845     "IEMobile",           # Windows mobile browser
4846     "Blazer",             # Palm Treo Blazer
4847     "BlackBerry",         # BlackBerries can emulate other browsers, but
4848                           # they still keep this string in the UserAgent
4849     "SymbianOS",          # New Series60 browser has safari in it and
4850                           # SymbianOS is the only distinguishing string
4851     "iPhone",             # Apple iPhone KHTML browser
4852     "iPod",               # iPod touch browser
4853     "MobileSafari",       # HTTP client in iPhone
4854     "Android",            # gPhone
4855     "Opera Mini",         # Opera Mini
4856     "HTC_P3700",          # HTC mobile device
4857     "Pre/",               # Palm Pre
4858     "webOS/",             # Palm WebOS
4859     "Nintendo DS",        # DSi / DSi-XL
4860     );
4861 foreach my $p (@prefixes) {
4862         return 1 if ($agent =~ /^\Q$p\E/);
4863         }
4864 foreach my $s (@substrings, @mobile_agents) {
4865         return 1 if ($agent =~ /\Q$s\E/);
4866         }
4867 return 0;
4868 }
4869
4870 # write_blocked_file()
4871 # Writes out a text file of blocked hosts and users
4872 sub write_blocked_file
4873 {
4874 open(BLOCKED, ">$config{'blockedfile'}");
4875 foreach my $d (grep { $hostfail{$_} } @deny) {
4876         print BLOCKED "host $d $hostfail{$d} $blockhosttime{$d}\n";
4877         }
4878 foreach my $d (grep { $userfail{$_} } @denyusers) {
4879         print BLOCKED "user $d $userfail{$d} $blockusertime{$d}\n";
4880         }
4881 close(BLOCKED);
4882 chmod(0700, $config{'blockedfile'});
4883 }
4884
4885 sub write_pid_file
4886 {
4887 open(PIDFILE, ">$config{'pidfile'}");
4888 printf PIDFILE "%d\n", getpid();
4889 close(PIDFILE);
4890 $miniserv_main_pid = getpid();
4891 }
4892
4893 # lock_user_password(user)
4894 # Updates a user's password file entry to lock it, both in memory and on disk.
4895 # Returns 1 if done, -1 if no such user, 0 if already locked
4896 sub lock_user_password
4897 {
4898 local ($user) = @_;
4899 local $uinfo = &get_user_details($user);
4900 if (!$uinfo) {
4901         # No such user!
4902         return -1;
4903         }
4904 if ($uinfo->{'pass'} =~ /^\!/) {
4905         # Already locked
4906         return 0;
4907         }
4908 if (!$uinfo->{'proto'}) {
4909         # Write to users file
4910         $users{$user} = "!".$users{$user};
4911         open(USERS, $config{'userfile'});
4912         local @ufile = <USERS>;
4913         close(USERS);
4914         foreach my $u (@ufile) {
4915                 local @uinfo = split(/:/, $u);
4916                 if ($uinfo[0] eq $user) {
4917                         $uinfo[1] = $users{$user};
4918                         }
4919                 $u = join(":", @uinfo);
4920                 }
4921         open(USERS, ">$config{'userfile'}");
4922         print USERS @ufile;
4923         close(USERS);
4924         return 0;
4925         }
4926
4927 if ($config{'userdb'}) {
4928         # Update user DB
4929         my ($dbh, $proto) = &connect_userdb($config{'userdb'});
4930         if (!$dbh) {
4931                 return -1;
4932                 }
4933         elsif ($proto eq "mysql" || $proto eq "postgresql") {
4934                 # Update user attribute
4935                 my $cmd = $dbh->prepare(
4936                         "update webmin_user set pass = ? where id = ?");
4937                 if (!$cmd || !$cmd->execute("!".$uinfo->{'pass'},
4938                                             $uinfo->{'id'})) {
4939                         # Update failed
4940                         print STDERR "Failed to lock password : ",
4941                                      $dbh->errstr,"\n";
4942                         return -1;
4943                         }
4944                 $cmd->finish() if ($cmd);
4945                 }
4946         elsif ($proto eq "ldap") {
4947                 # XXX update in LDAP
4948                 }
4949         &disconnect_userdb($config{'userdb'}, $dbh);
4950         return 0;
4951         }
4952
4953 return -1;      # This should never be reached
4954 }
4955
4956 # hash_session_id(sid)
4957 # Returns an MD5 or Unix-crypted session ID
4958 sub hash_session_id
4959 {
4960 local ($sid) = @_;
4961 if (!$hash_session_id_cache{$sid}) {
4962         if ($use_md5) {
4963                 # Take MD5 hash
4964                 $hash_session_id_cache{$sid} = &encrypt_md5($sid);
4965                 }
4966         else {
4967                 # Unix crypt
4968                 $hash_session_id_cache{$sid} = &unix_crypt($sid, "XX");
4969                 }
4970         }
4971 return $hash_session_id_cache{$sid};
4972 }
4973
4974 # encrypt_md5(string, [salt])
4975 # Returns a string encrypted in MD5 format
4976 sub encrypt_md5
4977 {
4978 local ($passwd, $salt) = @_;
4979 local $magic = '$1$';
4980 if ($salt =~ /^\$1\$([^\$]+)/) {
4981         # Extract actual salt from already encrypted password
4982         $salt = $1;
4983         }
4984
4985 # Add the password
4986 local $ctx = eval "new $use_md5";
4987 $ctx->add($passwd);
4988 if ($salt) {
4989         $ctx->add($magic);
4990         $ctx->add($salt);
4991         }
4992
4993 # Add some more stuff from the hash of the password and salt
4994 local $ctx1 = eval "new $use_md5";
4995 $ctx1->add($passwd);
4996 if ($salt) {
4997         $ctx1->add($salt);
4998         }
4999 $ctx1->add($passwd);
5000 local $final = $ctx1->digest();
5001 for($pl=length($passwd); $pl>0; $pl-=16) {
5002         $ctx->add($pl > 16 ? $final : substr($final, 0, $pl));
5003         }
5004
5005 # This piece of code seems rather pointless, but it's in the C code that
5006 # does MD5 in PAM so it has to go in!
5007 local $j = 0;
5008 local ($i, $l);
5009 for($i=length($passwd); $i; $i >>= 1) {
5010         if ($i & 1) {
5011                 $ctx->add("\0");
5012                 }
5013         else {
5014                 $ctx->add(substr($passwd, $j, 1));
5015                 }
5016         }
5017 $final = $ctx->digest();
5018
5019 if ($salt) {
5020         # This loop exists only to waste time
5021         for($i=0; $i<1000; $i++) {
5022                 $ctx1 = eval "new $use_md5";
5023                 $ctx1->add($i & 1 ? $passwd : $final);
5024                 $ctx1->add($salt) if ($i % 3);
5025                 $ctx1->add($passwd) if ($i % 7);
5026                 $ctx1->add($i & 1 ? $final : $passwd);
5027                 $final = $ctx1->digest();
5028                 }
5029         }
5030
5031 # Convert the 16-byte final string into a readable form
5032 local $rv;
5033 local @final = map { ord($_) } split(//, $final);
5034 $l = ($final[ 0]<<16) + ($final[ 6]<<8) + $final[12];
5035 $rv .= &to64($l, 4);
5036 $l = ($final[ 1]<<16) + ($final[ 7]<<8) + $final[13];
5037 $rv .= &to64($l, 4);
5038 $l = ($final[ 2]<<16) + ($final[ 8]<<8) + $final[14];
5039 $rv .= &to64($l, 4);
5040 $l = ($final[ 3]<<16) + ($final[ 9]<<8) + $final[15];
5041 $rv .= &to64($l, 4);
5042 $l = ($final[ 4]<<16) + ($final[10]<<8) + $final[ 5];
5043 $rv .= &to64($l, 4);
5044 $l = $final[11];
5045 $rv .= &to64($l, 2);
5046
5047 # Add salt if needed
5048 if ($salt) {
5049         return $magic.$salt.'$'.$rv;
5050         }
5051 else {
5052         return $rv;
5053         }
5054 }
5055
5056 sub to64
5057 {
5058 local ($v, $n) = @_;
5059 local $r;
5060 while(--$n >= 0) {
5061         $r .= $itoa64[$v & 0x3f];
5062         $v >>= 6;
5063         }
5064 return $r;
5065 }
5066
5067 # read_file(file, &assoc, [&order], [lowercase])
5068 # Fill an associative array with name=value pairs from a file
5069 sub read_file
5070 {
5071 open(ARFILE, $_[0]) || return 0;
5072 while(<ARFILE>) {
5073         s/\r|\n//g;
5074         if (!/^#/ && /^([^=]*)=(.*)$/) {
5075                 $_[1]->{$_[3] ? lc($1) : $1} = $2;
5076                 push(@{$_[2]}, $1) if ($_[2]);
5077                 }
5078         }
5079 close(ARFILE);
5080 return 1;
5081 }
5082
5083 # write_file(file, array)
5084 # Write out the contents of an associative array as name=value lines
5085 sub write_file
5086 {
5087 local(%old, @order);
5088 &read_file($_[0], \%old, \@order);
5089 open(ARFILE, ">$_[0]");
5090 foreach $k (@order) {
5091         print ARFILE $k,"=",$_[1]->{$k},"\n" if (exists($_[1]->{$k}));
5092         }
5093 foreach $k (keys %{$_[1]}) {
5094         print ARFILE $k,"=",$_[1]->{$k},"\n" if (!exists($old{$k}));
5095         }
5096 close(ARFILE);
5097 }
5098
5099 # execute_ready_webmin_crons()
5100 # Find and run any cron jobs that are due, based on their last run time and
5101 # execution interval
5102 sub execute_ready_webmin_crons
5103 {
5104 my $now = time();
5105 my $changed = 0;
5106 foreach my $cron (@webmincrons) {
5107         my $run = 0;
5108         if (!$webmincron_last{$cron->{'id'}}) {
5109                 # If not ever run before, don't run right away
5110                 $webmincron_last{$cron->{'id'}} = $now;
5111                 $changed = 1;
5112                 }
5113         elsif ($cron->{'interval'} &&
5114                $now - $webmincron_last{$cron->{'id'}} > $cron->{'interval'}) {
5115                 # Older than interval .. time to run
5116                 $run = 1;
5117                 }
5118         elsif ($cron->{'mins'}) {
5119                 # Check if current time matches spec, and we haven't run in the
5120                 # last minute
5121                 my @tm = localtime($now);
5122                 if (&matches_cron($cron->{'mins'}, $tm[1]) &&
5123                     &matches_cron($cron->{'hours'}, $tm[2]) &&
5124                     &matches_cron($cron->{'days'}, $tm[3]) &&
5125                     &matches_cron($cron->{'months'}, $tm[4]+1) &&
5126                     &matches_cron($cron->{'weekdays'}, $tm[6]) &&
5127                     $now - $webmincron_last{$cron->{'id'}} > 60) {
5128                         $run = 1;
5129                         }
5130                 }
5131
5132         if ($run) {
5133                 print DEBUG "Running cron id=$cron->{'id'} ".
5134                             "module=$cron->{'module'} func=$cron->{'func'}\n";
5135                 $webmincron_last{$cron->{'id'}} = $now;
5136                 $changed = 1;
5137                 my $pid = fork();
5138                 if (!$pid) {
5139                         # Run via a wrapper command, which we run like a CGI
5140
5141                         # Setup CGI-like environment
5142                         $envtz = $ENV{"TZ"};
5143                         $envuser = $ENV{"USER"};
5144                         $envpath = $ENV{"PATH"};
5145                         $envlang = $ENV{"LANG"};
5146                         $envroot = $ENV{"SystemRoot"};
5147                         $envperllib = $ENV{'PERLLIB'};
5148                         foreach my $k (keys %ENV) {
5149                                 delete($ENV{$k});
5150                                 }
5151                         $ENV{"PATH"} = $envpath if ($envpath);
5152                         $ENV{"TZ"} = $envtz if ($envtz);
5153                         $ENV{"USER"} = $envuser if ($envuser);
5154                         $ENV{"OLD_LANG"} = $envlang if ($envlang);
5155                         $ENV{"SystemRoot"} = $envroot if ($envroot);
5156                         $ENV{'PERLLIB'} = $envperllib if ($envperllib);
5157                         $ENV{"HOME"} = $user_homedir;
5158                         $ENV{"SERVER_SOFTWARE"} = $config{"server"};
5159                         $ENV{"SERVER_ADMIN"} = $config{"email"};
5160                         $root0 = $roots[0];
5161                         $ENV{"SERVER_ROOT"} = $root0;
5162                         $ENV{"SERVER_REALROOT"} = $root0;
5163                         $ENV{"SERVER_PORT"} = $config{'port'};
5164                         $ENV{"WEBMIN_CRON"} = 1;
5165                         $ENV{"DOCUMENT_ROOT"} = $root0;
5166                         $ENV{"DOCUMENT_REALROOT"} = $root0;
5167                         $ENV{"MINISERV_CONFIG"} = $config_file;
5168                         $ENV{"HTTPS"} = "ON" if ($use_ssl);
5169                         $ENV{"MINISERV_PID"} = $miniserv_main_pid;
5170                         $ENV{"SCRIPT_FILENAME"} = $config{'webmincron_wrapper'};
5171                         if ($ENV{"SCRIPT_FILENAME"} =~ /^\Q$root0\E(\/.*)$/) {
5172                                 $ENV{"SCRIPT_NAME"} = $1;
5173                                 }
5174                         $config{'webmincron_wrapper'} =~ /^(.*)\//;
5175                         $ENV{"PWD"} = $1;
5176                         foreach $k (keys %config) {
5177                                 if ($k =~ /^env_(\S+)$/) {
5178                                         $ENV{$1} = $config{$k};
5179                                         }
5180                                 }
5181                         chdir($ENV{"PWD"});
5182                         $SIG{'CHLD'} = 'DEFAULT';
5183                         eval {
5184                                 # Have SOCK closed if the perl exec's something
5185                                 use Fcntl;
5186                                 fcntl(SOCK, F_SETFD, FD_CLOEXEC);
5187                                 };
5188
5189                         # Run the wrapper script by evaling it
5190                         $pkg = "webmincron";
5191                         $0 = $config{'webmincron_wrapper'};
5192                         @ARGV = ( $cron );
5193                         $main_process_id = $$;
5194                         eval "
5195                                 \%pkg::ENV = \%ENV;
5196                                 package $pkg;
5197                                 do \$miniserv::config{'webmincron_wrapper'};
5198                                 die \$@ if (\$@);
5199                                 ";
5200                         if ($@) {
5201                                 print STDERR "Perl cron failure : $@\n";
5202                                 }
5203
5204                         exit(0);
5205                         }
5206                 push(@childpids, $pid);
5207                 }
5208         }
5209 if ($changed) {
5210         # Write out file containing last run times
5211         &write_file($config{'webmincron_last'}, \%webmincron_last);
5212         }
5213 }
5214
5215 # matches_cron(cron-spec, time)
5216 # Checks if some minute or hour matches some cron spec, which can be * or a list
5217 # of numbers.
5218 sub matches_cron
5219 {
5220 my ($spec, $tm) = @_;
5221 if ($spec eq '*') {
5222         return 1;
5223         }
5224 else {
5225         foreach my $s (split(/,/, $spec)) {
5226                 if ($s == $tm ||
5227                     $s =~ /^(\d+)\-(\d+)$/ && $tm >= $1 && $tm <= $2) {
5228                         return 1;
5229                         }
5230                 }
5231         return 0;
5232         }
5233 }
5234
5235 # read_webmin_crons()
5236 # Read all scheduled webmin cron functions and store them in the @webmincrons
5237 # global list
5238 sub read_webmin_crons
5239 {
5240 @webmincrons = ( );
5241 opendir(CRONS, $config{'webmincron_dir'});
5242 print DEBUG "Reading crons from $config{'webmincron_dir'}\n";
5243 foreach my $f (readdir(CRONS)) {
5244         if ($f =~ /^(\d+)\.cron$/) {
5245                 my %cron;
5246                 &read_file("$config{'webmincron_dir'}/$f", \%cron);
5247                 $cron{'id'} = $1;
5248                 my $broken = 0;
5249                 foreach my $n ('module', 'func') {
5250                         if (!$cron{$n}) {
5251                                 print STDERR "Cron $1 missing $n\n";
5252                                 $broken = 1;
5253                                 }
5254                         }
5255                 if (!$cron{'interval'} && !$cron{'mins'} && !$cron{'special'}) {
5256                         print STDERR "Cron $1 missing any time spec\n";
5257                         $broken = 1;
5258                         }
5259                 if ($cron{'special'} eq 'hourly') {
5260                         # Run every hour on the hour
5261                         $cron{'mins'} = 0;
5262                         $cron{'hours'} = '*';
5263                         $cron{'days'} = '*';
5264                         $cron{'months'} = '*';
5265                         $cron{'weekdays'} = '*';
5266                         }
5267                 elsif ($cron{'special'} eq 'daily') {
5268                         # Run every day at midnight
5269                         $cron{'mins'} = 0;
5270                         $cron{'hours'} = '0';
5271                         $cron{'days'} = '*';
5272                         $cron{'months'} = '*';
5273                         $cron{'weekdays'} = '*';
5274                         }
5275                 elsif ($cron{'special'} eq 'monthly') {
5276                         # Run every month on the 1st
5277                         $cron{'mins'} = 0;
5278                         $cron{'hours'} = '0';
5279                         $cron{'days'} = '1';
5280                         $cron{'months'} = '*';
5281                         $cron{'weekdays'} = '*';
5282                         }
5283                 elsif ($cron{'special'} eq 'weekly') {
5284                         # Run every month on the 1st
5285                         $cron{'mins'} = 0;
5286                         $cron{'hours'} = '0';
5287                         $cron{'days'} = '*';
5288                         $cron{'months'} = '*';
5289                         $cron{'weekdays'} = '0';
5290                         }
5291                 elsif ($cron{'special'} eq 'yearly' ||
5292                        $cron{'special'} eq 'annually') {
5293                         # Run every year on 1st january
5294                         $cron{'mins'} = 0;
5295                         $cron{'hours'} = '0';
5296                         $cron{'days'} = '1';
5297                         $cron{'months'} = '1';
5298                         $cron{'weekdays'} = '*';
5299                         }
5300                 elsif ($cron{'special'}) {
5301                         print STDERR "Cron $1 invalid special time $cron{'special'}\n";
5302                         $broken = 1;
5303                         }
5304                 if ($cron{'special'}) {
5305                         delete($cron{'special'});
5306                         }
5307                 if (!$broken) {
5308                         print DEBUG "adding cron id=$cron{'id'} module=$cron{'module'} func=$cron{'func'}\n";
5309                         push(@webmincrons, \%cron);
5310                         }
5311                 }
5312         }
5313 }