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