loncom/lond - view - 1.178.2.21

File: [LON-CAPA] / loncom / lond
Revision 1.178.2.21: download - view: text, annotated - select for diffs
Thu Apr 29 10:35:07 2004 UTC (20 years ago) by foxr
Branches: Refactoring

I liked the logic for sub unsub I put into the main branch better than the
hack job I put in here ... so transplant.

1: #!/usr/bin/perl 2: # The LearningOnline Network 3: # lond "LON Daemon" Server (port "LOND" 5663) 4: # 5: # $Id: lond,v 1.178.2.21 2004/04/29 10:35:07 foxr Exp $ 6: # 7: # Copyright Michigan State University Board of Trustees 8: # 9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA). 10: # 11: # LON-CAPA is free software; you can redistribute it and/or modify 12: # it under the terms of the GNU General Public License as published by 13: # the Free Software Foundation; either version 2 of the License, or 14: # (at your option) any later version. 15: # 16: # LON-CAPA is distributed in the hope that it will be useful, 17: # but WITHOUT ANY WARRANTY; without even the implied warranty of 18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19: # GNU General Public License for more details. 20: # 21: # You should have received a copy of the GNU General Public License 22: # along with LON-CAPA; if not, write to the Free Software 23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 24: # 25: # /home/httpd/html/adm/gpl.txt 26: # 27: 28: 29: # http://www.lon-capa.org/ 30: # 31: 32: use strict; 33: use lib '/home/httpd/lib/perl/'; 34: use LONCAPA::Configuration; 35: 36: use IO::Socket; 37: use IO::File; 38: #use Apache::File; 39: use Symbol; 40: use POSIX; 41: use Crypt::IDEA; 42: use LWP::UserAgent(); 43: use GDBM_File; 44: use Authen::Krb4; 45: use Authen::Krb5; 46: use lib '/home/httpd/lib/perl/'; 47: use localauth; 48: use File::Copy; 49: use LONCAPA::ConfigFileEdit; 50: 51: my $DEBUG = 1; # Non zero to enable debug log entries. 52: 53: my $status=''; 54: my $lastlog=''; 55: 56: my $VERSION='$Revision: 1.178.2.21 $'; #' stupid emacs 57: my $remoteVERSION; 58: my $currenthostid; 59: my $currentdomainid; 60: 61: my $client; 62: my $clientip; 63: my $clientname; 64: 65: my $cipher; # Cipher key negotiated with client. 66: my $tmpsnum = 0;; # Id of tmpputs. 67: 68: my $server; 69: my $thisserver; 70: 71: # 72: # Connection type is: 73: # client - All client actions are allowed 74: # manager - only management functions allowed. 75: # both - Both management and client actions are allowed 76: # 77: 78: my $ConnectionType; 79: 80: my %hostid; 81: my %hostdom; 82: my %hostip; 83: 84: my %managers; # Ip -> manager names 85: 86: my %perlvar; # Will have the apache conf defined perl vars. 87: 88: # 89: # The hash below is used for command dispatching, and is therefore keyed on the request keyword. 90: # Each element of the hash contains a reference to an array that contains: 91: # A reference to a sub that executes the request corresponding to the keyword. 92: # A flag that is true if the request must be encoded to be acceptable. 93: # A mask with bits as follows: 94: # CLIENT_OK - Set when the function is allowed by ordinary clients 95: # MANAGER_OK - Set when the function is allowed to manager clients. 96: # 97: my $CLIENT_OK = 1; 98: my $MANAGER_OK = 2; 99: my %Dispatcher; 100: 101: # 102: # The array below are password error strings." 103: # 104: my $lastpwderror = 13; # Largest error number from lcpasswd. 105: my @passwderrors = ("ok", 106: "lcpasswd must be run as user 'www'", 107: "lcpasswd got incorrect number of arguments", 108: "lcpasswd did not get the right nubmer of input text lines", 109: "lcpasswd too many simultaneous pwd changes in progress", 110: "lcpasswd User does not exist.", 111: "lcpasswd Incorrect current passwd", 112: "lcpasswd Unable to su to root.", 113: "lcpasswd Cannot set new passwd.", 114: "lcpasswd Username has invalid characters", 115: "lcpasswd Invalid characters in password", 116: "11", "12", 117: "lcpasswd Password mismatch"); 118: 119: 120: # The array below are lcuseradd error strings.: 121: 122: my $lastadderror = 13; 123: my @adderrors = ("ok", 124: "User ID mismatch, lcuseradd must run as user www", 125: "lcuseradd Incorrect number of command line parameters must be 3", 126: "lcuseradd Incorrect number of stdinput lines, must be 3", 127: "lcuseradd Too many other simultaneous pwd changes in progress", 128: "lcuseradd User does not exist", 129: "lcuseradd Unable to make www member of users's group", 130: "lcuseradd Unable to su to root", 131: "lcuseradd Unable to set password", 132: "lcuseradd Usrname has invalid characters", 133: "lcuseradd Password has an invalid character", 134: "lcuseradd User already exists", 135: "lcuseradd Could not add user.", 136: "lcuseradd Password mismatch"); 137: 138: # 139: # Statistics that are maintained and dislayed in the status line. 140: # 141: my $Transactions; # Number of attempted transactions. 142: my $Failures; # Number of transcations failed. 143: 144: # ResetStatistics: 145: # Resets the statistics counters: 146: # 147: sub ResetStatistics { 148: $Transactions = 0; 149: $Failures = 0; 150: } 151: 152: # 153: # Return true if client is a manager. 154: # 155: sub isManager { 156: return (($ConnectionType eq "manager") || ($ConnectionType eq "both")); 157: } 158: # 159: # Return tru if client can do client functions 160: # 161: sub isClient { 162: return (($ConnectionType eq "client") || ($ConnectionType eq "both")); 163: } 164: # 165: # Ties a domain level resource file to a hash. 166: # If requested a history entry is created in the associated hist file. 167: # 168: # Parameters: 169: # domain - Name of the domain in which the resource file lives. 170: # namespace - Name of the hash within that domain. 171: # how - How to tie the hash (e.g. GDBM_WRCREAT()). 172: # loghead - Optional parameter, if present a log entry is created 173: # in the associated history file and this is the first part 174: # of that entry. 175: # logtail - Goes along with loghead, The actual logentry is of the 176: # form $loghead:<timestamp>:logtail. 177: # Returns: 178: # Reference to a hash bound to the db file or alternatively undef 179: # if the tie failed. 180: # 181: sub TieDomainHash { 182: my $domain = shift; 183: my $namespace = shift; 184: my $how = shift; 185: 186: # Filter out any whitespace in the domain name: 187: 188: $domain =~ s/\W//g; 189: 190: # We have enough to go on to tie the hash: 191: 192: my $UserTopDir = $perlvar{'lonUsersDir'}; 193: my $DomainDir = $UserTopDir."/$domain"; 194: my $ResourceFile = $DomainDir."/$namespace.db"; 195: my %hash; 196: if(tie(%hash, 'GDBM_File', $ResourceFile, $how, 0640)) { 197: if (scalar @_) { # Need to log the operation. 198: my $logFh = IO::File->new(">>$DomainDir/$namespace.hist"); 199: if($logFh) { 200: my $TimeStamp = time; 201: my ($loghead, $logtail) = @_; 202: print $logFh "$loghead:$TimeStamp:$logtail\n"; 203: } 204: } 205: return \%hash; # Return the tied hash. 206: } 207: else { 208: return undef; # Tie failed. 209: } 210: } 211: 212: # 213: # Ties a user's resource file to a hash. 214: # If necessary, an appropriate history 215: # log file entry is made as well. 216: # This sub factors out common code from the subs that manipulate 217: # the various gdbm files that keep keyword value pairs. 218: # Parameters: 219: # domain - Name of the domain the user is in. 220: # user - Name of the 'current user'. 221: # namespace - Namespace representing the file to tie. 222: # how - What the tie is done to (e.g. GDBM_WRCREAT(). 223: # loghead - Optional first part of log entry if there may be a 224: # history file. 225: # what - Optional tail of log entry if there may be a history 226: # file. 227: # Returns: 228: # hash to which the database is tied. It's up to the caller to untie. 229: # undef if the has could not be tied. 230: # 231: sub TieUserHash { 232: my $domain = shift; 233: my $user = shift; 234: my $namespace = shift; 235: my $how = shift; 236: 237: $namespace=~s/\//\_/g; # / -> _ 238: $namespace=~s/\W//g; # whitespace eliminated. 239: my $proname = propath($domain, $user); 240: 241: # If this is a namespace for which a history is kept, 242: # make the history log entry: 243: 244: 245: unless ($namespace =~/^nohist\_/ && (scalar @_ > 0)) { 246: my $hfh = IO::File->new(">>$proname/$namespace.hist"); 247: if($hfh) { 248: my $now = time; 249: my $loghead = shift; 250: my $what = shift; 251: print $hfh "$loghead:$now:$what\n"; 252: } 253: } 254: # Tie the database. 255: 256: my %hash; 257: if(tie(%hash, 'GDBM_File', "$proname/$namespace.db", 258: $how, 0640)) { 259: return \%hash; 260: } 261: else { 262: return undef; 263: } 264: 265: } 266: 267: # 268: # Get a Request: 269: # Gets a Request message from the client. The transaction 270: # is defined as a 'line' of text. We remove the new line 271: # from the text line. 272: # 273: sub GetRequest { 274: my $input = <$client>; 275: chomp($input); 276: 277: Debug("Request = $input\n"); 278: 279: &status('Processing '.$clientname.':'.$input); 280: 281: return $input; 282: } 283: # 284: # Decipher encoded traffic 285: # Parameters: 286: # input - Encoded data. 287: # Returns: 288: # Decoded data or undef if encryption key was not yet negotiated. 289: # Implicit input: 290: # cipher - This global holds the negotiated encryption key. 291: # 292: sub Decipher { 293: my $input = shift; 294: my $output = ''; 295: 296: 297: if($cipher) { 298: my($enc, $enclength, $encinput) = split(/:/, $input); 299: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) { 300: $output .= 301: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16))); 302: } 303: return substr($output, 0, $enclength); 304: } else { 305: return undef; 306: } 307: } 308: 309: # 310: # Register a command processor. This function is invoked to register a sub 311: # to process a request. Once registered, the ProcessRequest sub can automatically 312: # dispatch requests to an appropriate sub, and do the top level validity checking 313: # as well: 314: # - Is the keyword recognized. 315: # - Is the proper client type attempting the request. 316: # - Is the request encrypted if it has to be. 317: # Parameters: 318: # $RequestName - Name of the request being registered. 319: # This is the command request that will match 320: # against the hash keywords to lookup the information 321: # associated with the dispatch information. 322: # $Procedure - Reference to a sub to call to process the request. 323: # All subs get called as follows: 324: # Procedure($cmd, $tail, $replyfd, $key) 325: # $cmd - the actual keyword that invoked us. 326: # $tail - the tail of the request that invoked us. 327: # $replyfd- File descriptor connected to the client 328: # $MustEncode - True if the request must be encoded to be good. 329: # $ClientOk - True if it's ok for a client to request this. 330: # $ManagerOk - True if it's ok for a manager to request this. 331: # Side effects: 332: # - On success, the Dispatcher hash has an entry added for the key $RequestName 333: # - On failure, the program will die as it's a bad internal bug to try to 334: # register a duplicate command handler. 335: # 336: sub RegisterHandler { 337: my $RequestName = shift; 338: my $Procedure = shift; 339: my $MustEncode = shift; 340: my $ClientOk = shift; 341: my $ManagerOk = shift; 342: 343: # Don't allow duplication# 344: 345: if (defined $Dispatcher{$RequestName}) { 346: die "Attempting to define a duplicate request handler for $RequestName\n"; 347: } 348: # Build the client type mask: 349: 350: my $ClientTypeMask = 0; 351: if($ClientOk) { 352: $ClientTypeMask |= $CLIENT_OK; 353: } 354: if($ManagerOk) { 355: $ClientTypeMask |= $MANAGER_OK; 356: } 357: 358: # Enter the hash: 359: 360: my @entry = ($Procedure, $MustEncode, $ClientTypeMask); 361: 362: $Dispatcher{$RequestName} = \@entry; 363: 364: 365: } 366: 367: #--------------------- Request Handlers -------------------------------------------- 368: # 369: # By convention each request handler registers itself prior to the sub declaration: 370: # 371: 372: # Handles ping requests. 373: # Parameters: 374: # $cmd - the actual keyword that invoked us. 375: # $tail - the tail of the request that invoked us. 376: # $replyfd- File descriptor connected to the client 377: # Implicit Inputs: 378: # $currenthostid - Global variable that carries the name of the host we are 379: # known as. 380: # Returns: 381: # 1 - Ok to continue processing. 382: # 0 - Program should exit. 383: # Side effects: 384: # Reply information is sent to the client. 385: 386: sub PingHandler { 387: my $cmd = shift; 388: my $tail = shift; 389: my $client = shift; 390: 391: Reply( $client,"$currenthostid\n","$cmd:$tail"); 392: 393: return 1; 394: } 395: RegisterHandler("ping", \&PingHandler, 0, 1, 1); # Ping unencoded, client or manager. 396: # 397: # Handles pong reequests: 398: # Parameters: 399: # $cmd - the actual keyword that invoked us. 400: # $tail - the tail of the request that invoked us. 401: # $replyfd- File descriptor connected to the client 402: # Implicit Inputs: 403: # $currenthostid - Global variable that carries the name of the host we are 404: # connected to. 405: # Returns: 406: # 1 - Ok to continue processing. 407: # 0 - Program should exit. 408: # Side effects: 409: # Reply information is sent to the client. 410: 411: sub PongHandler { 412: my $cmd = shift; 413: my $tail = shift; 414: my $replyfd = shift; 415: 416: my $reply=&reply("ping",$clientname); 417: Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 418: return 1; 419: } 420: RegisterHandler("pong", \&PongHandler, 0, 1, 1); # Pong unencoded, client or manager 421: 422: # 423: # EstablishKeyHandler: 424: # Called to establish an encrypted session key with the remote client. 425: # 426: # Parameters: 427: # $cmd - the actual keyword that invoked us. 428: # $tail - the tail of the request that invoked us. 429: # $replyfd- File descriptor connected to the client 430: # Implicit Inputs: 431: # $currenthostid - Global variable that carries the name of the host 432: # known as. 433: # $clientname - Global variable that carries the name of the hsot we're connected to. 434: # Returns: 435: # 1 - Ok to continue processing. 436: # 0 - Program should exit. 437: # Implicit Outputs: 438: # Reply information is sent to the client. 439: # $cipher is set with a reference to a new IDEA encryption object. 440: # 441: sub EstablishKeyHandler { 442: my $cmd = shift; 443: my $tail = shift; 444: my $replyfd = shift; 445: 446: my $buildkey=time.$$.int(rand 100000); 447: $buildkey=~tr/1-6/A-F/; 448: $buildkey=int(rand 100000).$buildkey.int(rand 100000); 449: my $key=$currenthostid.$clientname; 450: $key=~tr/a-z/A-Z/; 451: $key=~tr/G-P/0-9/; 452: $key=~tr/Q-Z/0-9/; 453: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey; 454: $key=substr($key,0,32); 455: my $cipherkey=pack("H32",$key); 456: $cipher=new IDEA $cipherkey; 457: Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 458: 459: return 1; 460: 461: } 462: RegisterHandler("ekey", \&EstablishKeyHandler, 0, 1,1); 463: 464: # LoadHandler: 465: # Handler for the load command. Returns the current system load average 466: # to the requestor. 467: # 468: # Parameters: 469: # $cmd - the actual keyword that invoked us. 470: # $tail - the tail of the request that invoked us. 471: # $replyfd- File descriptor connected to the client 472: # Implicit Inputs: 473: # $currenthostid - Global variable that carries the name of the host 474: # known as. 475: # $clientname - Global variable that carries the name of the hsot we're connected to. 476: # Returns: 477: # 1 - Ok to continue processing. 478: # 0 - Program should exit. 479: # Side effects: 480: # Reply information is sent to the client. 481: sub LoadHandler { 482: my $cmd = shift; 483: my $tail = shift; 484: my $replyfd = shift; 485: 486: # Get the load average from /proc/loadavg and calculate it as a percentage of 487: # the allowed load limit as set by the perl global variable lonLoadLim 488: 489: my $loadavg; 490: my $loadfile=IO::File->new('/proc/loadavg'); 491: 492: $loadavg=<$loadfile>; 493: $loadavg =~ s/\s.*//g; # Extract the first field only. 494: 495: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'}; 496: 497: Reply( $replyfd, "$loadpercent\n", "$cmd:$tail"); 498: 499: return 1; 500: } 501: RegisterHandler("load", \&LoadHandler, 0, 1, 0); 502: 503: 504: # 505: # Process the userload request. This sub returns to the client the current 506: # user load average. It can be invoked either by clients or managers. 507: # 508: # Parameters: 509: # $cmd - the actual keyword that invoked us. 510: # $tail - the tail of the request that invoked us. 511: # $replyfd- File descriptor connected to the client 512: # Implicit Inputs: 513: # $currenthostid - Global variable that carries the name of the host 514: # known as. 515: # $clientname - Global variable that carries the name of the hsot we're connected to. 516: # Returns: 517: # 1 - Ok to continue processing. 518: # 0 - Program should exit 519: # Implicit inputs: 520: # whatever the userload() function requires. 521: # Implicit outputs: 522: # the reply is written to the client. 523: # 524: sub UserLoadHandler { 525: my $cmd = shift; 526: my $tail = shift; 527: my $replyfd = shift; 528: 529: my $userloadpercent=&userload(); 530: Reply($replyfd, "$userloadpercent\n", "$cmd:$tail"); 531: 532: return 1; 533: } 534: RegisterHandler("userload", \&UserLoadHandler, 0, 1, 0); 535: 536: # Process a request for the authorization type of a user: 537: # (userauth). 538: # 539: # Parameters: 540: # $cmd - the actual keyword that invoked us. 541: # $tail - the tail of the request that invoked us. 542: # $replyfd- File descriptor connected to the client 543: # Returns: 544: # 1 - Ok to continue processing. 545: # 0 - Program should exit 546: # Implicit outputs: 547: # The user authorization type is written to the client. 548: # 549: sub UserAuthorizationType { 550: my $cmd = shift; 551: my $tail = shift; 552: my $replyfd = shift; 553: 554: my $userinput = "$cmd:$tail"; 555: 556: # Pull the domain and username out of the command tail. 557: # and call GetAuthType to determine the authentication type. 558: 559: my ($udom,$uname)=split(/:/,$tail); 560: my $result = GetAuthType($udom, $uname); 561: if($result eq "nouser") { 562: Failure( $replyfd, "unknown_user\n", $userinput); 563: } else { 564: # 565: # We only want to pass the second field from GetAuthType 566: # for ^krb.. otherwise we'll be handing out the encrypted 567: # password for internals e.g. 568: # 569: my ($type,$otherinfo) = split(/:/,$result); 570: if($type =~ /^krb/) { 571: $type = $result; 572: } 573: Reply( $replyfd, "$type\n", $userinput); 574: } 575: 576: return 1; 577: } 578: RegisterHandler("currentauth", \&UserAuthorizationType, 1, 1, 0); 579: # 580: # Process a request by a manager to push a hosts or domain table 581: # to us. We pick apart the command and pass it on to the subs 582: # that already exist to do this. 583: # 584: # Parameters: 585: # $cmd - the actual keyword that invoked us. 586: # $tail - the tail of the request that invoked us. 587: # $client - File descriptor connected to the client 588: # Returns: 589: # 1 - Ok to continue processing. 590: # 0 - Program should exit 591: # Implicit Output: 592: # a reply is written to the client. 593: 594: sub PushFileHandler { 595: my $cmd = shift; 596: my $tail = shift; 597: my $client = shift; 598: 599: my $userinput = "$cmd:$tail"; 600: 601: # At this time we only know that the IP of our partner is a valid manager 602: # the code below is a hook to do further authentication (e.g. to resolve 603: # spoofing). 604: 605: my $cert = GetCertificate($userinput); 606: if(ValidManager($cert)) { 607: 608: # Now presumably we have the bona fides of both the peer host and the 609: # process making the request. 610: 611: my $reply = PushFile($userinput); 612: Reply($client, "$reply\n", $userinput); 613: 614: } else { 615: Failure( $client, "refused\n", $userinput); 616: } 617: } 618: RegisterHandler("pushfile", \&PushFileHandler, 1, 0, 1); 619: 620: 621: 622: # Process a reinit request. Reinit requests that either 623: # lonc or lond be reinitialized so that an updated 624: # host.tab or domain.tab can be processed. 625: # 626: # Parameters: 627: # $cmd - the actual keyword that invoked us. 628: # $tail - the tail of the request that invoked us. 629: # $client - File descriptor connected to the client 630: # Returns: 631: # 1 - Ok to continue processing. 632: # 0 - Program should exit 633: # Implicit output: 634: # a reply is sent to the client. 635: # 636: sub ReinitProcessHandler { 637: my $cmd = shift; 638: my $tail = shift; 639: my $client = shift; 640: 641: my $userinput = "$cmd:$tail"; 642: 643: my $cert = GetCertificate($userinput); 644: if(ValidManager($cert)) { 645: chomp($userinput); 646: my $reply = ReinitProcess($userinput); 647: Reply( $client, "$reply\n", $userinput); 648: } else { 649: Failure( $client, "refused\n", $userinput); 650: } 651: return 1; 652: } 653: 654: RegisterHandler("reinit", \&ReinitProcessHandler, 1, 0, 1); 655: 656: # Process the editing script for a table edit operation. 657: # the editing operation must be encrypted and requested by 658: # a manager host. 659: # 660: # Parameters: 661: # $cmd - the actual keyword that invoked us. 662: # $tail - the tail of the request that invoked us. 663: # $client - File descriptor connected to the client 664: # Returns: 665: # 1 - Ok to continue processing. 666: # 0 - Program should exit 667: # Implicit output: 668: # a reply is sent to the client. 669: # 670: sub EditTableHandler { 671: my $command = shift; 672: my $tail = shift; 673: my $client = shift; 674: 675: my $userinput = "$command:$tail"; 676: 677: my $cert = GetCertificate($userinput); 678: if(ValidManager($cert)) { 679: my($filetype, $script) = split(/:/, $tail); 680: if (($filetype eq "hosts") || 681: ($filetype eq "domain")) { 682: if($script ne "") { 683: Reply($client, # BUGBUG - EditFile 684: EditFile($userinput), # could fail. 685: $userinput); 686: } else { 687: Failure($client,"refused\n",$userinput); 688: } 689: } else { 690: Failure($client,"refused\n",$userinput); 691: } 692: } else { 693: Failure($client,"refused\n",$userinput); 694: } 695: return 1; 696: } 697: RegisterHandler("edit", \&EditTableHandler, 1, 0, 1); 698: 699: 700: # 701: # Authenticate a user against the LonCAPA authentication 702: # database. Note that there are several authentication 703: # possibilities: 704: # - unix - The user can be authenticated against the unix 705: # password file. 706: # - internal - The user can be authenticated against a purely 707: # internal per user password file. 708: # - kerberos - The user can be authenticated against either a kerb4 or kerb5 709: # ticket granting authority. 710: # - user - The person tailoring LonCAPA can supply a user authentication 711: # mechanism that is per system. 712: # 713: # Parameters: 714: # $cmd - The command that got us here. 715: # $tail - Tail of the command (remaining parameters). 716: # $client - File descriptor connected to client. 717: # Returns 718: # 0 - Requested to exit, caller should shut down. 719: # 1 - Continue processing. 720: # Implicit inputs: 721: # The authentication systems describe above have their own forms of implicit 722: # input into the authentication process that are described above. 723: # 724: sub AuthenticateHandler { 725: my $cmd = shift; 726: my $tail = shift; 727: my $client = shift; 728: 729: # Regenerate the full input line 730: 731: my $userinput = $cmd.":".$tail; 732: 733: # udom - User's domain. 734: # uname - Username. 735: # upass - User's password. 736: 737: my ($udom,$uname,$upass)=split(/:/,$tail); 738: Debug(" Authenticate domain = $udom, user = $uname, password = $upass"); 739: chomp($upass); 740: $upass=unescape($upass); 741: 742: my $pwdcorrect = ValidateUser($udom, $uname, $upass); 743: if($pwdcorrect) { 744: Reply( $client, "authorized\n", $userinput); 745: # 746: # Bad credentials: Failed to authorize 747: # 748: } else { 749: Failure( $client, "non_authorized\n", $userinput); 750: } 751: 752: return 1; 753: } 754: RegisterHandler("auth", \&AuthenticateHandler, 1, 1, 0); 755: 756: # 757: # Change a user's password. Note that this function is complicated by 758: # the fact that a user may be authenticated in more than one way: 759: # At present, we are not able to change the password for all types of 760: # authentication methods. Only for: 761: # unix - unix password or shadow passoword style authentication. 762: # local - Locally written authentication mechanism. 763: # For now, kerb4 and kerb5 password changes are not supported and result 764: # in an error. 765: # FUTURE WORK: 766: # Support kerberos passwd changes? 767: # Parameters: 768: # $cmd - The command that got us here. 769: # $tail - Tail of the command (remaining parameters). 770: # $client - File descriptor connected to client. 771: # Returns 772: # 0 - Requested to exit, caller should shut down. 773: # 1 - Continue processing. 774: # Implicit inputs: 775: # The authentication systems describe above have their own forms of implicit 776: # input into the authentication process that are described above. 777: sub ChangePasswordHandler { 778: my $cmd = shift; 779: my $tail = shift; 780: my $client = shift; 781: 782: my $userinput = $cmd.":".$tail; # Reconstruct client's string. 783: 784: # 785: # udom - user's domain. 786: # uname - Username. 787: # upass - Current password. 788: # npass - New password. 789: 790: my ($udom,$uname,$upass,$npass)=split(/:/,$tail); 791: chomp($npass); 792: $upass=&unescape($upass); 793: $npass=&unescape($npass); 794: &Debug("Trying to change password for $uname"); 795: 796: # First require that the user can be authenticated with their 797: # old password: 798: 799: my $validated = ValidateUser($udom, $uname, $upass); 800: if($validated) { 801: my $realpasswd = GetAuthType($udom, $uname); # Defined since authd. 802: 803: my ($howpwd,$contentpwd)=split(/:/,$realpasswd); 804: if ($howpwd eq 'internal') { 805: &Debug("internal auth"); 806: my $salt=time; 807: $salt=substr($salt,6,2); 808: my $ncpass=crypt($npass,$salt); 809: if(RewritePwFile($udom, $uname, "internal:$ncpass")) { 810: &logthis("Result of password change for " 811: ."$uname: pwchange_success"); 812: Reply($client, "ok\n", $userinput); 813: } else { 814: &logthis("Unable to open $uname passwd " 815: ."to change password"); 816: Failure( $client, "non_authorized\n",$userinput); 817: } 818: } elsif ($howpwd eq 'unix') { 819: # Unix means we have to access /etc/password 820: &Debug("auth is unix"); 821: my $execdir=$perlvar{'lonDaemons'}; 822: &Debug("Opening lcpasswd pipeline"); 823: my $pf = IO::File->new("|$execdir/lcpasswd > " 824: ."$perlvar{'lonDaemons'}" 825: ."/logs/lcpasswd.log"); 826: print $pf "$uname\n$npass\n$npass\n"; 827: close $pf; 828: my $err = $?; 829: my $result = ($err>0 ? 'pwchange_failure' : 'ok'); 830: &logthis("Result of password change for $uname: ". 831: &lcpasswdstrerror($?)); 832: Reply($client, "$result\n", $userinput); 833: } else { 834: # this just means that the current password mode is not 835: # one we know how to change (e.g the kerberos auth modes or 836: # locally written auth handler). 837: # 838: Reply( $client, "auth_mode_error\n", $userinput); 839: } 840: 841: } 842: else { 843: Reply( $client, "non_authorized\n", $userinput); 844: } 845: 846: return 1; 847: } 848: RegisterHandler("passwd", \&ChangePasswordHandler, 1, 1, 0); 849: 850: # 851: # Create a new user. User in this case means a lon-capa user. 852: # The user must either already exist in some authentication realm 853: # like kerberos or the /etc/passwd. If not, a user completely local to 854: # this loncapa system is created. 855: # 856: # Parameters: 857: # $cmd - The command that got us here. 858: # $tail - Tail of the command (remaining parameters). 859: # $client - File descriptor connected to client. 860: # Returns 861: # 0 - Requested to exit, caller should shut down. 862: # 1 - Continue processing. 863: # Implicit inputs: 864: # The authentication systems describe above have their own forms of implicit 865: # input into the authentication process that are described above. 866: sub AddUserHandler { 867: my $cmd = shift; 868: my $tail = shift; 869: my $client = shift; 870: 871: my ($udom,$uname,$umode,$npass)=split(/:/,$tail); 872: my $userinput = $cmd.":".$tail; # Reconstruct the full request line. 873: 874: &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname); 875: 876: 877: if($udom eq $currentdomainid) { # Reject new users for other domains... 878: 879: my $oldumask=umask(0077); 880: chomp($npass); 881: $npass=&unescape($npass); 882: my $passfilename = PasswordPath($udom, $uname); 883: &Debug("Password file created will be:".$passfilename); 884: if (-e $passfilename) { 885: Failure( $client, "already_exists\n", $userinput); 886: } else { 887: my @fpparts=split(/\//,$passfilename); 888: my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2]; 889: my $fperror=''; 890: for (my $i=3;$i<= ($#fpparts-1);$i++) { 891: $fpnow.='/'.$fpparts[$i]; 892: unless (-e $fpnow) { 893: &logthis("mkdir $fpnow"); 894: unless (mkdir($fpnow,0777)) { 895: $fperror="error: ".($!+0)." mkdir failed while attempting " 896: ."makeuser"; 897: } 898: } 899: } 900: unless ($fperror) { 901: my $result=&make_passwd_file($uname, $umode,$npass, $passfilename); 902: Reply($client, $result, $userinput); #BUGBUG - could be fail 903: } else { 904: Failure($client, "$fperror\n", $userinput); 905: } 906: } 907: umask($oldumask); 908: } else { 909: Failure($client, "not_right_domain\n", 910: $userinput); # Even if we are multihomed. 911: 912: } 913: return 1; 914: 915: } 916: RegisterHandler("makeuser", \&AddUserHandler, 1, 1, 0); 917: 918: # 919: # Change the authentication method of a user. Note that this may 920: # also implicitly change the user's password if, for example, the user is 921: # joining an existing authentication realm. Known authentication realms at 922: # this time are: 923: # internal - Purely internal password file (only loncapa knows this user) 924: # local - Institutionally written authentication module. 925: # unix - Unix user (/etc/passwd with or without /etc/shadow). 926: # kerb4 - kerberos version 4 927: # kerb5 - kerberos version 5 928: # 929: # Parameters: 930: # $cmd - The command that got us here. 931: # $tail - Tail of the command (remaining parameters). 932: # $client - File descriptor connected to client. 933: # Returns 934: # 0 - Requested to exit, caller should shut down. 935: # 1 - Continue processing. 936: # Implicit inputs: 937: # The authentication systems describe above have their own forms of implicit 938: # input into the authentication process that are described above. 939: # 940: sub ChangeAuthenticationHandler { 941: my $cmd = shift; 942: my $tail = shift; 943: my $client = shift; 944: 945: my $userinput = "$cmd:$tail"; # Reconstruct user input. 946: 947: my ($udom,$uname,$umode,$npass)=split(/:/,$tail); 948: &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode); 949: if ($udom ne $currentdomainid) { 950: Failure( $client, "not_right_domain\n", $client); 951: } else { 952: 953: chomp($npass); 954: 955: $npass=&unescape($npass); 956: my $passfilename = PasswordPath($udom, $uname); 957: if ($passfilename) { # Not allowed to create a new user!! 958: my $result=&make_passwd_file($uname, $umode,$npass,$passfilename); 959: Reply($client, $result, $userinput); 960: } else { 961: Failure($client, "non_authorized", $userinput); # Fail the user now. 962: } 963: } 964: return 1; 965: } 966: RegisterHandler("changeuserauth", \&ChangeAuthenticationHandler, 1,1, 0); 967: 968: # 969: # Determines if this is the home server for a user. The home server 970: # for a user will have his/her lon-capa passwd file. Therefore all we need 971: # to do is determine if this file exists. 972: # 973: # Parameters: 974: # $cmd - The command that got us here. 975: # $tail - Tail of the command (remaining parameters). 976: # $client - File descriptor connected to client. 977: # Returns 978: # 0 - Requested to exit, caller should shut down. 979: # 1 - Continue processing. 980: # Implicit inputs: 981: # The authentication systems describe above have their own forms of implicit 982: # input into the authentication process that are described above. 983: # 984: sub IsHomeHandler { 985: my $cmd = shift; 986: my $tail = shift; 987: my $client = shift; 988: 989: my $userinput = "$cmd:$tail"; 990: 991: my ($udom,$uname)=split(/:/,$tail); 992: chomp($uname); 993: my $passfile = PasswordFilename($udom, $uname); 994: if($passfile) { 995: Reply( $client, "found\n", $userinput); 996: } else { 997: Failure($client, "not_found\n", $userinput); 998: } 999: return 1; 1000: } 1001: RegisterHandler("home", \&IsHomeHandler, 0,1,0); 1002: # 1003: # Process an update request for a resource?? I think what's going on here is 1004: # that a resource has been modified that we hold a subscription to. 1005: # If the resource is not local, then we must update, or at least invalidate our 1006: # cached copy of the resource. 1007: # FUTURE WORK: 1008: # I need to look at this logic carefully. My druthers would be to follow 1009: # typical caching logic, and simple invalidate the cache, drop any subscription 1010: # an let the next fetch start the ball rolling again... however that may 1011: # actually be more difficult than it looks given the complex web of 1012: # proxy servers. 1013: # Parameters: 1014: # $cmd - The command that got us here. 1015: # $tail - Tail of the command (remaining parameters). 1016: # $client - File descriptor connected to client. 1017: # Returns 1018: # 0 - Requested to exit, caller should shut down. 1019: # 1 - Continue processing. 1020: # Implicit inputs: 1021: # The authentication systems describe above have their own forms of implicit 1022: # input into the authentication process that are described above. 1023: # 1024: sub UpdateResourceHandler { 1025: my $cmd = shift; 1026: my $tail = shift; 1027: my $client = shift; 1028: 1029: my $userinput = "$cmd:$tail"; 1030: 1031: my $fname=split(/:/,$tail); # This allows interactive testing 1032: chomp($fname); # with telnet. 1033: 1034: my $ownership=ishome($fname); 1035: if ($ownership eq 'not_owner') { 1036: if (-e $fname) { 1037: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size, 1038: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname); 1039: my $now=time; 1040: my $since=$now-$atime; 1041: if ($since>$perlvar{'lonExpire'}) { 1042: my $reply=&reply("unsub:$fname","$clientname"); 1043: unlink("$fname"); 1044: } else { 1045: my $transname="$fname.in.transfer"; 1046: my $remoteurl=&reply("sub:$fname","$clientname"); 1047: my $response; 1048: alarm(120); 1049: { 1050: my $ua=new LWP::UserAgent; 1051: my $request=new HTTP::Request('GET',"$remoteurl"); 1052: $response=$ua->request($request,$transname); 1053: } 1054: alarm(0); 1055: if ($response->is_error()) { 1056: unlink($transname); 1057: my $message=$response->status_line; 1058: &logthis("LWP GET: $message for $fname ($remoteurl)"); 1059: } else { 1060: if ($remoteurl!~/\.meta$/) { 1061: alarm(120); 1062: { 1063: my $ua=new LWP::UserAgent; 1064: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta'); 1065: my $mresponse=$ua->request($mrequest,$fname.'.meta'); 1066: if ($mresponse->is_error()) { 1067: unlink($fname.'.meta'); 1068: } 1069: } 1070: alarm(0); 1071: } 1072: rename($transname,$fname); 1073: } 1074: } 1075: Reply( $client, "ok\n", $userinput); 1076: } else { 1077: Failure($client, "not_found\n", $userinput); 1078: } 1079: } else { 1080: Failure($client, "rejected\n", $userinput); 1081: } 1082: return 1; 1083: } 1084: RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0); 1085: 1086: # 1087: # Fetch a user file from a remote server: 1088: # Parameters: 1089: # $cmd - The command that got us here. 1090: # $tail - Tail of the command (remaining parameters). 1091: # $client - File descriptor connected to client. 1092: # Returns 1093: # 0 - Requested to exit, caller should shut down. 1094: # 1 - Continue processing. 1095: # 1096: sub FetchUserFileHandler { 1097: my $cmd = shift; 1098: my $tail = shift; 1099: my $client = shift; 1100: 1101: my $userinput = "$cmd:$tail"; 1102: my $fname = $tail; 1103: my ($udom,$uname,$ufile)=split(/\//,$fname); 1104: my $udir=propath($udom,$uname).'/userfiles'; 1105: unless (-e $udir) { 1106: mkdir($udir,0770); 1107: } 1108: if (-e $udir) { 1109: $ufile=~s/^[\.\~]+//; 1110: $ufile=~s/\///g; 1111: my $destname=$udir.'/'.$ufile; 1112: my $transname=$udir.'/'.$ufile.'.in.transit'; 1113: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname; 1114: my $response; 1115: alarm(120); 1116: { 1117: my $ua=new LWP::UserAgent; 1118: my $request=new HTTP::Request('GET',"$remoteurl"); 1119: $response=$ua->request($request,$transname); 1120: } 1121: alarm(0); 1122: if ($response->is_error()) { 1123: unlink($transname); 1124: my $message=$response->status_line; 1125: &logthis("LWP GET: $message for $fname ($remoteurl)"); 1126: Failure($client, "failed\n", $userinput); 1127: } else { 1128: if (!rename($transname,$destname)) { 1129: &logthis("Unable to move $transname to $destname"); 1130: unlink($transname); 1131: Failure($client, "failed\n", $userinput); 1132: } else { 1133: Reply($client, "ok\n", $userinput); 1134: } 1135: } 1136: } else { 1137: Failure($client, "not_home\n", $userinput); 1138: } 1139: return 1; 1140: } 1141: RegisterHandler("fetchuserfile", \&FetchUserFileHandler, 0, 1, 0); 1142: # 1143: # Authenticate access to a user file. 1144: # 1145: # Parameters: 1146: # $cmd - The command that got us here. 1147: # $tail - Tail of the command (remaining parameters). 1148: # $client - File descriptor connected to client. 1149: # Returns 1150: # 0 - Requested to exit, caller should shut down. 1151: # 1 - Continue processing. 1152: sub AuthenticateUserFileAccess { 1153: my $cmd = shift; 1154: my $tail = shift; 1155: my $client = shift; 1156: my $userinput = "$cmd:$tail"; 1157: 1158: my ($fname,$session)=split(/:/,$tail); 1159: chomp($session); 1160: my $reply='non_auth'; 1161: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) { 1162: while (my $line=<ENVIN>) { 1163: if ($line=~/userfile\.$fname\=/) { 1164: $reply='ok'; 1165: } 1166: } 1167: close(ENVIN); 1168: Reply($client, $reply."\n", $userinput); 1169: } else { 1170: Failure($client, "invalid_token\n", $userinput); 1171: } 1172: return 1; 1173: 1174: } 1175: RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0); 1176: # 1177: # Unsubscribe from a resource. 1178: # 1179: # Parameters: 1180: # $cmd - The command that got us here. 1181: # $tail - Tail of the command (remaining parameters). 1182: # $client - File descriptor connected to client. 1183: # Returns 1184: # 0 - Requested to exit, caller should shut down. 1185: # 1 - Continue processing. 1186: # 1187: sub UnsubscribeHandler { 1188: my $cmd = shift; 1189: my $tail = shift; 1190: my $client = shift; 1191: my $userinput= "$cmd:$tail"; 1192: 1193: my ($fname) = split(/:/,$tail); # This allows for interactive testing 1194: # e.g. manual telnet and unsub:res: 1195: # Otherwise the \r gets in the way. 1196: chomp($fname); 1197: Debug("Unsubscribing $fname"); 1198: if (-e $fname) { 1199: Debug("Exists"); 1200: Reply($client, &unsub($fname,$clientip), $userinput); 1201: } else { 1202: Failure($client, "not_found\n", $userinput); 1203: } 1204: return 1; 1205: } 1206: RegisterHandler("unsub", \&UnsubscribeHandler, 0, 1, 0); 1207: 1208: # Subscribe to a resource 1209: # 1210: # Parameters: 1211: # $cmd - The command that got us here. 1212: # $tail - Tail of the command (remaining parameters). 1213: # $client - File descriptor connected to client. 1214: # Returns 1215: # 0 - Requested to exit, caller should shut down. 1216: # 1 - Continue processing. 1217: # 1218: sub SubscribeHandler { 1219: my $cmd = shift; 1220: my $tail = shift; 1221: my $client = shift; 1222: my $userinput = "$cmd:$tail"; 1223: 1224: Reply( $client, &subscribe($userinput,$clientip), $userinput); 1225: 1226: return 1; 1227: } 1228: RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0); 1229: 1230: # 1231: # Determine the version of a resource (?) Or is it return 1232: # the top version of the resource? Not yet clear from the 1233: # code in currentversion. 1234: # 1235: # Parameters: 1236: # $cmd - The command that got us here. 1237: # $tail - Tail of the command (remaining parameters). 1238: # $client - File descriptor connected to client. 1239: # Returns 1240: # 0 - Requested to exit, caller should shut down. 1241: # 1 - Continue processing. 1242: # 1243: sub CurrentVersionHandler { 1244: my $cmd = shift; 1245: my $tail = shift; 1246: my $client = shift; 1247: my $userinput= "$cmd:$tail"; 1248: 1249: my $fname = $tail; 1250: Reply( $client, &currentversion($fname)."\n", $userinput); 1251: return 1; 1252: 1253: } 1254: RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0); 1255: 1256: 1257: # Make an entry in a user's activity log. 1258: # 1259: # Parameters: 1260: # $cmd - The command that got us here. 1261: # $tail - Tail of the command (remaining parameters). 1262: # $client - File descriptor connected to client. 1263: # Returns 1264: # 0 - Requested to exit, caller should shut down. 1265: # 1 - Continue processing. 1266: # 1267: sub ActivityLogEntryHandler { 1268: my $cmd = shift; 1269: my $tail = shift; 1270: my $client = shift; 1271: my $userinput= "$cmd:$tail"; 1272: 1273: my ($udom,$uname,$what)=split(/:/,$tail); 1274: chomp($what); 1275: my $proname=propath($udom,$uname); 1276: my $now=time; 1277: my $hfh; 1278: if ($hfh=IO::File->new(">>$proname/activity.log")) { 1279: print $hfh "$now:$clientname:$what\n"; 1280: Reply( $client, "ok\n", $userinput); 1281: } else { 1282: Failure($client, "error: ".($!+0)." IO::File->new Failed " 1283: ."while attempting log\n", 1284: $userinput); 1285: } 1286: 1287: return 1; 1288: } 1289: RegisterHandler("log", \&ActivityLogEntryHandler, 0, 1, 0); 1290: # 1291: # Put a namespace entry in a user profile hash. 1292: # My druthers would be for this to be an encrypted interaction too. 1293: # anything that might be an inadvertent covert channel about either 1294: # user authentication or user personal information.... 1295: # 1296: # Parameters: 1297: # $cmd - The command that got us here. 1298: # $tail - Tail of the command (remaining parameters). 1299: # $client - File descriptor connected to client. 1300: # Returns 1301: # 0 - Requested to exit, caller should shut down. 1302: # 1 - Continue processing. 1303: # 1304: sub PutUserProfileEntry { 1305: my $cmd = shift; 1306: my $tail = shift; 1307: my $client = shift; 1308: my $userinput = "$cmd:$tail"; 1309: 1310: my ($udom,$uname,$namespace,$what) =split(/:/,$tail); 1311: if ($namespace ne 'roles') { 1312: chomp($what); 1313: my $hashref = TieUserHash($udom, $uname, $namespace, 1314: &GDBM_WRCREAT(),"P",$what); 1315: if($hashref) { 1316: my @pairs=split(/\&/,$what); 1317: foreach my $pair (@pairs) { 1318: my ($key,$value)=split(/=/,$pair); 1319: $hashref->{$key}=$value; 1320: } 1321: if (untie(%$hashref)) { 1322: Reply( $client, "ok\n", $userinput); 1323: } else { 1324: Failure($client, "error: ".($!+0)." untie(GDBM) failed ". 1325: "while attempting put\n", 1326: $userinput); 1327: } 1328: } else { 1329: Failure( $client, "error: ".($!)." tie(GDBM) Failed ". 1330: "while attempting put\n", $userinput); 1331: } 1332: } else { 1333: Failure( $client, "refused\n", $userinput); 1334: } 1335: 1336: return 1; 1337: } 1338: RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0); 1339: 1340: # 1341: # Increment a profile entry in the user history file. 1342: # The history contains keyword value pairs. In this case, 1343: # The value itself is a pair of numbers. The first, the current value 1344: # the second an increment that this function applies to the current 1345: # value. 1346: # 1347: # Parameters: 1348: # $cmd - The command that got us here. 1349: # $tail - Tail of the command (remaining parameters). 1350: # $client - File descriptor connected to client. 1351: # Returns 1352: # 0 - Requested to exit, caller should shut down. 1353: # 1 - Continue processing. 1354: # 1355: sub IncrementUserValueHandler { 1356: my $cmd = shift; 1357: my $tail = shift; 1358: my $client = shift; 1359: my $userinput = "$cmd:$tail"; 1360: 1361: my ($udom,$uname,$namespace,$what) =split(/:/,$tail); 1362: if ($namespace ne 'roles') { 1363: chomp($what); 1364: my $hashref = TieUserHash($udom, $uname, 1365: $namespace, &GDBM_WRCREAT(), 1366: "P",$what); 1367: if ($hashref) { 1368: my @pairs=split(/\&/,$what); 1369: foreach my $pair (@pairs) { 1370: my ($key,$value)=split(/=/,$pair); 1371: # We could check that we have a number... 1372: if (! defined($value) || $value eq '') { 1373: $value = 1; 1374: } 1375: $hashref->{$key}+=$value; 1376: } 1377: if (untie(%$hashref)) { 1378: Reply( $client, "ok\n", $userinput); 1379: } else { 1380: Failure($client, "error: ".($!+0)." untie(GDBM) failed ". 1381: "while attempting inc\n", $userinput); 1382: } 1383: } else { 1384: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1385: "while attempting inc\n", $userinput); 1386: } 1387: } else { 1388: Failure($client, "refused\n", $userinput); 1389: } 1390: 1391: return 1; 1392: } 1393: RegisterHandler("inc", \&IncrementUserValueHandler, 0, 1, 0); 1394: # 1395: # Put a new role for a user. Roles are LonCAPA's packaging of permissions. 1396: # Each 'role' a user has implies a set of permissions. Adding a new role 1397: # for a person grants the permissions packaged with that role 1398: # to that user when the role is selected. 1399: # 1400: # Parameters: 1401: # $cmd - The command string (rolesput). 1402: # $tail - The remainder of the request line. For rolesput this 1403: # consists of a colon separated list that contains: 1404: # The domain and user that is granting the role (logged). 1405: # The domain and user that is getting the role. 1406: # The roles being granted as a set of & separated pairs. 1407: # each pair a key value pair. 1408: # $client - File descriptor connected to the client. 1409: # Returns: 1410: # 0 - If the daemon should exit 1411: # 1 - To continue processing. 1412: # 1413: # 1414: sub RolesPutHandler { 1415: my $cmd = shift; 1416: my $tail = shift; 1417: my $client = shift; 1418: my $userinput = "$cmd:$tail"; 1419: 1420: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail); 1421: 1422: 1423: my $namespace='roles'; 1424: chomp($what); 1425: my $hashref = TieUserHash($udom, $uname, $namespace, 1426: &GDBM_WRCREAT(), "P", 1427: "$exedom:$exeuser:$what"); 1428: # 1429: # Log the attempt to set a role. The {}'s here ensure that the file 1430: # handle is open for the minimal amount of time. Since the flush 1431: # is done on close this improves the chances the log will be an un- 1432: # corrupted ordered thing. 1433: if ($hashref) { 1434: my @pairs=split(/\&/,$what); 1435: foreach my $pair (@pairs) { 1436: my ($key,$value)=split(/=/,$pair); 1437: &ManagePermissions($key, $udom, $uname, 1438: &GetAuthType( $udom, $uname)); 1439: $hashref->{$key}=$value; 1440: } 1441: if (untie($hashref)) { 1442: Reply($client, "ok\n", $userinput); 1443: } else { 1444: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1445: "while attempting rolesput\n", $userinput); 1446: } 1447: } else { 1448: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1449: "while attempting rolesput\n", $userinput); 1450: } 1451: return 1; 1452: } 1453: RegisterHandler("rolesput", \&RolesPutHandler, 1,1,0); # Encoded client only. 1454: # 1455: # Deletes (removes) a role for a user. This is equivalent to removing 1456: # a permissions package associated with the role from the user's profile. 1457: # 1458: # Parameters: 1459: # $cmd - The command (rolesdel) 1460: # $tail - The remainder of the request line. This consists 1461: # of: 1462: # The domain and user requesting the change (logged) 1463: # The domain and user being changed. 1464: # The roles being revoked. These are shipped to us 1465: # as a bunch of & separated role name keywords. 1466: # $client - The file handle open on the client. 1467: # Returns: 1468: # 1 - Continue processing 1469: # 0 - Exit. 1470: # 1471: sub RolesDeleteHandler { 1472: my $cmd = shift; 1473: my $tail = shift; 1474: my $client = shift; 1475: my $userinput = "$cmd:$tail"; 1476: 1477: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail); 1478: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom. 1479: "what = ".$what); 1480: my $namespace='roles'; 1481: chomp($what); 1482: my $hashref = TieUserHash($udom, $uname, $namespace, 1483: &GDBM_WRCREAT(), "D", 1484: "$exedom:$exeuser:$what"); 1485: 1486: if ($hashref) { 1487: my @rolekeys=split(/\&/,$what); 1488: 1489: foreach my $key (@rolekeys) { 1490: delete $hashref->{$key}; 1491: } 1492: if (untie(%$hashref)) { 1493: Reply($client, "ok\n", $userinput); 1494: } else { 1495: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1496: "while attempting rolesdel\n", $userinput); 1497: } 1498: } else { 1499: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1500: "while attempting rolesdel\n", $userinput); 1501: } 1502: 1503: return 1; 1504: } 1505: RegisterHandler("rolesdel", \&RolesDeleteHandler, 1,1, 0); # Encoded client only 1506: 1507: # Unencrypted get from a user's profile database. See 1508: # GetProfileEntryEncrypted for a version that does end-to-end encryption. 1509: # This function retrieves a keyed item from a specific named database in the 1510: # user's directory. 1511: # 1512: # Parameters: 1513: # $cmd - Command request keyword (get). 1514: # $tail - Tail of the command. This is a colon separated list 1515: # consisting of the domain and username that uniquely 1516: # identifies the profile, 1517: # The 'namespace' which selects the gdbm file to 1518: # do the lookup in, 1519: # & separated list of keys to lookup. Note that 1520: # the values are returned as an & separated list too. 1521: # $client - File descriptor open on the client. 1522: # Returns: 1523: # 1 - Continue processing. 1524: # 0 - Exit. 1525: # 1526: sub GetProfileEntry { 1527: my $cmd = shift; 1528: my $tail = shift; 1529: my $client = shift; 1530: my $userinput= "$cmd:$tail"; 1531: 1532: my ($udom,$uname,$namespace,$what) = split(/:/,$tail); 1533: chomp($what); 1534: my $hashref = TieUserHash($udom, $uname, $namespace, 1535: &GDBM_READER()); 1536: if ($hashref) { 1537: my @queries=split(/\&/,$what); 1538: my $qresult=''; 1539: 1540: for (my $i=0;$i<=$#queries;$i++) { 1541: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string. 1542: } 1543: $qresult=~s/\&$//; # Remove trailing & from last lookup. 1544: if (untie(%$hashref)) { 1545: Reply($client, "$qresult\n", $userinput); 1546: } else { 1547: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1548: "while attempting get\n", $userinput); 1549: } 1550: } else { 1551: if ($!+0 == 2) { # +0 coerces errno -> number 2 is ENOENT 1552: Failure($client, "error:No such file or ". 1553: "GDBM reported bad block error\n", $userinput); 1554: } else { # Some other undifferentiated err. 1555: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1556: "while attempting get\n", $userinput); 1557: } 1558: } 1559: return 1; 1560: } 1561: RegisterHandler("get", \&GetProfileEntry, 0,1,0); 1562: # 1563: # Process the encrypted get request. Note that the request is sent 1564: # in clear, but the reply is encrypted. This is a small covert channel: 1565: # information about the sensitive keys is given to the snooper. Just not 1566: # information about the values of the sensitive key. Hmm if I wanted to 1567: # know these I'd snoop for the egets. Get the profile item names from them 1568: # and then issue a get for them since there's no enforcement of the 1569: # requirement of an encrypted get for particular profile items. If I 1570: # were re-doing this, I'd force the request to be encrypted as well as the 1571: # reply. I'd also just enforce encrypted transactions for all gets since 1572: # that would prevent any covert channel snooping. 1573: # 1574: # Parameters: 1575: # $cmd - Command keyword of request (eget). 1576: # $tail - Tail of the command. See GetProfileEntry # for more information about this. 1577: # $client - File open on the client. 1578: # Returns: 1579: # 1 - Continue processing 1580: # 0 - server should exit. 1581: sub GetProfileEntryEncrypted { 1582: my $cmd = shift; 1583: my $tail = shift; 1584: my $client = shift; 1585: my $userinput = "$cmd:$tail"; 1586: 1587: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput); 1588: chomp($what); 1589: my $hashref = TieUserHash($udom, $uname, $namespace, 1590: &GDBM_READER()); 1591: if ($hashref) { 1592: my @queries=split(/\&/,$what); 1593: my $qresult=''; 1594: for (my $i=0;$i<=$#queries;$i++) { 1595: $qresult.="$hashref->{$queries[$i]}&"; 1596: } 1597: if (untie(%$hashref)) { 1598: $qresult=~s/\&$//; 1599: if ($cipher) { 1600: my $cmdlength=length($qresult); 1601: $qresult.=" "; 1602: my $encqresult=''; 1603: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) { 1604: $encqresult.= unpack("H16", 1605: $cipher->encrypt(substr($qresult, 1606: $encidx, 1607: 8))); 1608: } 1609: Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput); 1610: } else { 1611: Failure( $client, "error:no_key\n", $userinput); 1612: } 1613: } else { 1614: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1615: "while attempting eget\n", $userinput); 1616: } 1617: } else { 1618: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1619: "while attempting eget\n", $userinput); 1620: } 1621: 1622: return 1; 1623: } 1624: RegisterHandler("eget", \&GetProfileEntryEncrypted, 0, 1, 0); 1625: 1626: # 1627: # Deletes a key in a user profile database. 1628: # 1629: # Parameters: 1630: # $cmd - Command keyword (del). 1631: # $tail - Command tail. IN this case a colon 1632: # separated list containing: 1633: # The domain and user that identifies uniquely 1634: # the identity of the user. 1635: # The profile namespace (name of the profile 1636: # database file). 1637: # & separated list of keywords to delete. 1638: # $client - File open on client socket. 1639: # Returns: 1640: # 1 - Continue processing 1641: # 0 - Exit server. 1642: # 1643: # 1644: 1645: sub DeleteProfileEntry { 1646: my $cmd = shift; 1647: my $tail = shift; 1648: my $client = shift; 1649: my $userinput = "cmd:$tail"; 1650: 1651: my ($udom,$uname,$namespace,$what) = split(/:/,$tail); 1652: chomp($what); 1653: my $hashref = TieUserHash($udom, $uname, $namespace, 1654: &GDBM_WRCREAT(), 1655: "D",$what); 1656: if ($hashref) { 1657: my @keys=split(/\&/,$what); 1658: foreach my $key (@keys) { 1659: delete($hashref->{$key}); 1660: } 1661: if (untie(%$hashref)) { 1662: Reply($client, "ok\n", $userinput); 1663: } else { 1664: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1665: "while attempting del\n", $userinput); 1666: } 1667: } else { 1668: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1669: "while attempting del\n", $userinput); 1670: } 1671: return 1; 1672: } 1673: RegisterHandler("del", \&DeleteProfileEntry, 0, 1, 0); 1674: # 1675: # List the set of keys that are defined in a profile database file. 1676: # A successful reply from this will contain an & separated list of 1677: # the keys. 1678: # Parameters: 1679: # $cmd - Command request (keys). 1680: # $tail - Remainder of the request, a colon separated 1681: # list containing domain/user that identifies the 1682: # user being queried, and the database namespace 1683: # (database filename essentially). 1684: # $client - File open on the client. 1685: # Returns: 1686: # 1 - Continue processing. 1687: # 0 - Exit the server. 1688: # 1689: sub GetProfileKeys { 1690: my $cmd = shift; 1691: my $tail = shift; 1692: my $client = shift; 1693: my $userinput = "$cmd:$tail"; 1694: 1695: my ($udom,$uname,$namespace)=split(/:/,$tail); 1696: my $qresult=''; 1697: my $hashref = TieUserHash($udom, $uname, $namespace, 1698: &GDBM_READER()); 1699: if ($hashref) { 1700: foreach my $key (keys %$hashref) { 1701: $qresult.="$key&"; 1702: } 1703: if (untie(%$hashref)) { 1704: $qresult=~s/\&$//; 1705: Reply($client, "$qresult\n", $userinput); 1706: } else { 1707: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1708: "while attempting keys\n", $userinput); 1709: } 1710: } else { 1711: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1712: "while attempting keys\n", $userinput); 1713: } 1714: 1715: return 1; 1716: } 1717: RegisterHandler("keys", \&GetProfileKeys, 0, 1, 0); 1718: # 1719: # Dump the contents of a user profile database. 1720: # Note that this constitutes a very large covert channel too since 1721: # the dump will return sensitive information that is not encrypted. 1722: # The naive security assumption is that the session negotiation ensures 1723: # our client is trusted and I don't believe that's assured at present. 1724: # Sure want badly to go to ssl or tls. Of course if my peer isn't really 1725: # a LonCAPA node they could have negotiated an encryption key too so >sigh<. 1726: # 1727: # Parameters: 1728: # $cmd - The command request keyword (currentdump). 1729: # $tail - Remainder of the request, consisting of a colon 1730: # separated list that has the domain/username and 1731: # the namespace to dump (database file). 1732: # $client - file open on the remote client. 1733: # Returns: 1734: # 1 - Continue processing. 1735: # 0 - Exit the server. 1736: # 1737: sub DumpProfileDatabase { 1738: my $cmd = shift; 1739: my $tail = shift; 1740: my $client = shift; 1741: my $userinput = "$cmd:$tail"; 1742: 1743: my ($udom,$uname,$namespace) = split(/:/,$tail); 1744: my $hashref = TieUserHash($udom, $uname, $namespace, 1745: &GDBM_READER()); 1746: if ($hashref) { 1747: # Structure of %data: 1748: # $data{$symb}->{$parameter}=$value; 1749: # $data{$symb}->{'v.'.$parameter}=$version; 1750: # since $parameter will be unescaped, we do not 1751: # have to worry about silly parameter names... 1752: 1753: my $qresult=''; 1754: my %data = (); # A hash of anonymous hashes.. 1755: while (my ($key,$value) = each(%$hashref)) { 1756: my ($v,$symb,$param) = split(/:/,$key); 1757: next if ($v eq 'version' || $symb eq 'keys'); 1758: next if (exists($data{$symb}) && 1759: exists($data{$symb}->{$param}) && 1760: $data{$symb}->{'v.'.$param} > $v); 1761: $data{$symb}->{$param}=$value; 1762: $data{$symb}->{'v.'.$param}=$v; 1763: } 1764: if (untie(%$hashref)) { 1765: while (my ($symb,$param_hash) = each(%data)) { 1766: while(my ($param,$value) = each (%$param_hash)){ 1767: next if ($param =~ /^v\./); # Ignore versions... 1768: # 1769: # Just dump the symb=value pairs separated by & 1770: # 1771: $qresult.=$symb.':'.$param.'='.$value.'&'; 1772: } 1773: } 1774: chop($qresult); 1775: Reply($client , "$qresult\n", $userinput); 1776: } else { 1777: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1778: "while attempting currentdump\n", $userinput); 1779: } 1780: } else { 1781: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1782: "while attempting currentdump\n", $userinput); 1783: } 1784: 1785: return 1; 1786: } 1787: RegisterHandler("currentdump", \&DumpProfileDatabase, 0, 1, 0); 1788: # 1789: # Dump a profile database with an optional regular expression 1790: # to match against the keys. In this dump, no effort is made 1791: # to separate symb from version information. Presumably the 1792: # databases that are dumped by this command are of a different 1793: # structure. Need to look at this and improve the documentation of 1794: # both this and the currentdump handler. 1795: # Parameters: 1796: # $cmd - The command keyword. 1797: # $tail - All of the characters after the $cmd: 1798: # These are expected to be a colon 1799: # separated list containing: 1800: # domain/user - identifying the user. 1801: # namespace - identifying the database. 1802: # regexp - optional regular expression 1803: # that is matched against 1804: # database keywords to do 1805: # selective dumps. 1806: # $client - Channel open on the client. 1807: # Returns: 1808: # 1 - Continue processing. 1809: # Side effects: 1810: # response is written to $client. 1811: # 1812: sub DumpWithRegexp { 1813: my $cmd = shift; 1814: my $tail = shift; 1815: my $client = shift; 1816: 1817: my $userinput = "$cmd:$tail"; 1818: 1819: my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail); 1820: if (defined($regexp)) { 1821: $regexp=&unescape($regexp); 1822: } else { 1823: $regexp='.'; 1824: } 1825: my $hashref =TieUserHash($udom, $uname, $namespace, 1826: &GDBM_READER()); 1827: if ($hashref) { 1828: my $qresult=''; 1829: while (my ($key,$value) = each(%$hashref)) { 1830: if ($regexp eq '.') { 1831: $qresult.=$key.'='.$value.'&'; 1832: } else { 1833: my $unescapeKey = &unescape($key); 1834: if (eval('$unescapeKey=~/$regexp/')) { 1835: $qresult.="$key=$value&"; 1836: } 1837: } 1838: } 1839: if (untie(%$hashref)) { 1840: chop($qresult); 1841: Reply($client, "$qresult\n", $userinput); 1842: } else { 1843: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1844: "while attempting dump\n", $userinput); 1845: } 1846: } else { 1847: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1848: "while attempting dump\n", $userinput); 1849: } 1850: 1851: return 1; 1852: } 1853: RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0); 1854: 1855: # Store an aitem in any resource meta data(?) or database with 1856: # versioning? 1857: # 1858: # Parameters: 1859: # $cmd - Request command keyword. 1860: # $tail - Tail of the request. This is a colon 1861: # separated list containing: 1862: # domain/user - User and authentication domain. 1863: # namespace - Name of the database being modified 1864: # rid - Resource keyword to modify. 1865: # what - new value associated with rid. 1866: # 1867: # $client - Socket open on the client. 1868: # 1869: # 1870: # Returns: 1871: # 1 (keep on processing). 1872: # Side-Effects: 1873: # Writes to the client 1874: sub StoreHandler { 1875: my $cmd = shift; 1876: my $tail = shift; 1877: my $client = shift; 1878: 1879: my $userinput = "$cmd:$tail"; 1880: 1881: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail); 1882: if ($namespace ne 'roles') { 1883: 1884: chomp($what); 1885: my @pairs=split(/\&/,$what); 1886: my $hashref = TieUserHash($udom, $uname, $namespace, 1887: &GDBM_WRCREAT(), "P", 1888: "$rid:$what"); 1889: if ($hashref) { 1890: my $now = time; 1891: my @previouskeys=split(/&/,$hashref->{"keys:$rid"}); 1892: my $key; 1893: $hashref->{"version:$rid"}++; 1894: my $version=$hashref->{"version:$rid"}; 1895: my $allkeys=''; 1896: foreach my $pair (@pairs) { 1897: my ($key,$value)=split(/=/,$pair); 1898: $allkeys.=$key.':'; 1899: $hashref->{"$version:$rid:$key"}=$value; 1900: } 1901: $hashref->{"$version:$rid:timestamp"}=$now; 1902: $allkeys.='timestamp'; 1903: $hashref->{"$version:keys:$rid"}=$allkeys; 1904: if (untie($hashref)) { 1905: Reply($client, "ok\n", $userinput); 1906: } else { 1907: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1908: "while attempting store\n", $userinput); 1909: } 1910: } else { 1911: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1912: "while attempting store\n", $userinput); 1913: } 1914: } else { 1915: Failure($client, "refused\n", $userinput); 1916: } 1917: 1918: return 1; 1919: } 1920: RegisterHandler("store", \&StoreHandler, 0, 1, 0); 1921: # 1922: # Restore a prior version of a resource. 1923: # 1924: # Parameters: 1925: # $cmd - Command keyword. 1926: # $tail - Remainder of the request which consists of: 1927: # domain/user - User and auth. domain. 1928: # namespace - name of resource database. 1929: # rid - Resource id. 1930: # $client - socket open on the client. 1931: # 1932: # Returns: 1933: # 1 indicating the caller should not yet exit. 1934: # Side-effects: 1935: # Writes a reply to the client. 1936: # 1937: sub RestoreHandler { 1938: my $cmd = shift; 1939: my $tail = shift; 1940: my $client = shift; 1941: 1942: my $userinput = "$cmd:$tail"; # Only used for logging purposes. 1943: 1944: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput); 1945: $namespace=~s/\//\_/g; 1946: $namespace=~s/\W//g; 1947: chomp($rid); 1948: my $proname=propath($udom,$uname); 1949: my $qresult=''; 1950: my %hash; 1951: if (tie(%hash,'GDBM_File',"$proname/$namespace.db", 1952: &GDBM_READER(),0640)) { 1953: my $version=$hash{"version:$rid"}; 1954: $qresult.="version=$version&"; 1955: my $scope; 1956: for ($scope=1;$scope<=$version;$scope++) { 1957: my $vkeys=$hash{"$scope:keys:$rid"}; 1958: my @keys=split(/:/,$vkeys); 1959: my $key; 1960: $qresult.="$scope:keys=$vkeys&"; 1961: foreach $key (@keys) { 1962: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&"; 1963: } 1964: } 1965: if (untie(%hash)) { 1966: $qresult=~s/\&$//; 1967: Reply( $client, "$qresult\n", $userinput); 1968: } else { 1969: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1970: "while attempting restore\n", $userinput); 1971: } 1972: } else { 1973: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1974: "while attempting restore\n", $userinput); 1975: } 1976: 1977: return 1; 1978: 1979: 1980: } 1981: RegisterHandler("restore", \&RestoreHandler, 0,1,0); 1982: 1983: # 1984: # Add a chat message to to a discussion board. 1985: # 1986: # Parameters: 1987: # $cmd - Request keyword. 1988: # $tail - Tail of the command. A colon separated list 1989: # containing: 1990: # cdom - Domain on which the chat board lives 1991: # cnum - Identifier of the discussion group. 1992: # post - Body of the posting. 1993: # $client - Socket open on the client. 1994: # Returns: 1995: # 1 - Indicating caller should keep on processing. 1996: # 1997: # Side-effects: 1998: # writes a reply to the client. 1999: # 2000: # 2001: sub SendChatHandler { 2002: my $cmd = shift; 2003: my $tail = shift; 2004: my $client = shift; 2005: 2006: my $userinput = "$cmd:$tail"; 2007: 2008: my ($cdom,$cnum,$newpost)=split(/\:/,$tail); 2009: &chatadd($cdom,$cnum,$newpost); 2010: Reply($client, "ok\n", $userinput); 2011: 2012: return 1; 2013: } 2014: RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0); 2015: # 2016: # Retrieve the set of chat messagss from a discussion board. 2017: # 2018: # Parameters: 2019: # $cmd - Command keyword that initiated the request. 2020: # $tail - Remainder of the request after the command 2021: # keyword. In this case a colon separated list of 2022: # chat domain - Which discussion board. 2023: # chat id - Discussion thread(?) 2024: # domain/user - Authentication domain and username 2025: # of the requesting person. 2026: # $client - Socket open on the client program. 2027: # Returns: 2028: # 1 - continue processing 2029: # Side effects: 2030: # Response is written to the client. 2031: # 2032: sub RetrieveChatHandler { 2033: my $cmd = shift; 2034: my $tail = shift; 2035: my $client = shift; 2036: 2037: my $userinput = "$cmd:$tail"; 2038: 2039: my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail); 2040: my $reply=''; 2041: foreach (&getchat($cdom,$cnum,$udom,$uname)) { 2042: $reply.=&escape($_).':'; 2043: } 2044: $reply=~s/\:$//; 2045: Reply($client, $reply."\n", $userinput); 2046: 2047: 2048: return 1; 2049: } 2050: RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0); 2051: # 2052: # Initiate a query of an sql database. SQL query repsonses get put in 2053: # a file for later retrieval. This prevents sql query results from 2054: # bottlenecking the system. Note that with loncnew, perhaps this is 2055: # less of an issue since multiple outstanding requests can be concurrently 2056: # serviced. 2057: # 2058: # Parameters: 2059: # $cmd - COmmand keyword that initiated the request. 2060: # $tail - Remainder of the command after the keyword. 2061: # For this function, this consists of a query and 2062: # 3 arguments that are self-documentingly labelled 2063: # in the original arg1, arg2, arg3. 2064: # $client - Socket open on the client. 2065: # Return: 2066: # 1 - Indicating processing should continue. 2067: # Side-effects: 2068: # a reply is written to $client. 2069: # 2070: sub SendQueryHandler { 2071: my $cmd = shift; 2072: my $tail = shift; 2073: my $client = shift; 2074: 2075: my $userinput = "$cmd:$tail"; 2076: 2077: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail); 2078: $query=~s/\n*$//g; 2079: Reply($client, "". sqlreply("$clientname\&$query". 2080: "\&$arg1"."\&$arg2"."\&$arg3")."\n", 2081: $userinput); 2082: 2083: return 1; 2084: } 2085: RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0); 2086: 2087: # 2088: # Add a reply to an sql query. SQL queries are done asyncrhonously. 2089: # The query is submitted via a "querysend" transaction. 2090: # There it is passed on to the lonsql daemon, queued and issued to 2091: # mysql. 2092: # This transaction is invoked when the sql transaction is complete 2093: # it stores the query results in flie and indicates query completion. 2094: # presumably local software then fetches this response... I'm guessing 2095: # the sequence is: lonc does a querysend, we ask lonsql to do it. 2096: # lonsql on completion of the query interacts with the lond of our 2097: # client to do a query reply storing two files: 2098: # - id - The results of the query. 2099: # - id.end - Indicating the transaction completed. 2100: # NOTE: id is a unique id assigned to the query and querysend time. 2101: # Parameters: 2102: # $cmd - Command keyword that initiated this request. 2103: # $tail - Remainder of the tail. In this case that's a colon 2104: # separated list containing the query Id and the 2105: # results of the query. 2106: # $client - Socket open on the client. 2107: # Return: 2108: # 1 - Indicating that we should continue processing. 2109: # Side effects: 2110: # ok written to the client. 2111: # 2112: sub ReplyQueryHandler { 2113: my $cmd = shift; 2114: my $tail = shift; 2115: my $client = shift; 2116: 2117: my $userinput = "$cmd:$tail"; 2118: 2119: my ($cmd,$id,$reply)=split(/:/,$userinput); 2120: my $store; 2121: my $execdir=$perlvar{'lonDaemons'}; 2122: if ($store=IO::File->new(">$execdir/tmp/$id")) { 2123: $reply=~s/\&/\n/g; 2124: print $store $reply; 2125: close $store; 2126: my $store2=IO::File->new(">$execdir/tmp/$id.end"); 2127: print $store2 "done\n"; 2128: close $store2; 2129: Reply($client, "ok\n", $userinput); 2130: } else { 2131: Failure($client, "error: ".($!+0) 2132: ." IO::File->new Failed ". 2133: "while attempting queryreply\n", $userinput); 2134: } 2135: 2136: 2137: return 1; 2138: } 2139: RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0); 2140: # 2141: # Process the courseidput query. Not quite sure what this means 2142: # at the system level sense. It appears a gdbm file in the 2143: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and 2144: # a set of entries made in that database. 2145: # 2146: # Parameters: 2147: # $cmd - The command keyword that initiated this request. 2148: # $tail - Tail of the command. In this case consists of a colon 2149: # separated list contaning the domain to apply this to and 2150: # an ampersand separated list of keyword=value pairs. 2151: # $client - Socket open on the client. 2152: # Returns: 2153: # 1 - indicating that processing should continue 2154: # 2155: # Side effects: 2156: # reply is written to the client. 2157: # 2158: sub PutCourseIdHandler { 2159: my $cmd = shift; 2160: my $tail = shift; 2161: my $client = shift; 2162: 2163: my $userinput = "$cmd:$tail"; 2164: 2165: my ($udom, $what) = split(/:/, $tail); 2166: chomp($what); 2167: my $now=time; 2168: my @pairs=split(/\&/,$what); 2169: 2170: my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT()); 2171: if ($hashref) { 2172: foreach my $pair (@pairs) { 2173: my ($key,$value)=split(/=/,$pair); 2174: $hashref->{$key}=$value.':'.$now; 2175: } 2176: if (untie(%$hashref)) { 2177: Reply($client, "ok\n", $userinput); 2178: } else { 2179: Failure( $client, "error: ".($!+0) 2180: ." untie(GDBM) Failed ". 2181: "while attempting courseidput\n", $userinput); 2182: } 2183: } else { 2184: Failure( $client, "error: ".($!+0) 2185: ." tie(GDBM) Failed ". 2186: "while attempting courseidput\n", $userinput); 2187: } 2188: 2189: return 1; 2190: } 2191: RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0); 2192: 2193: # Retrieves the value of a course id resource keyword pattern 2194: # defined since a starting date. Both the starting date and the 2195: # keyword pattern are optional. If the starting date is not supplied it 2196: # is treated as the beginning of time. If the pattern is not found, 2197: # it is treatred as "." matching everything. 2198: # 2199: # Parameters: 2200: # $cmd - Command keyword that resulted in us being dispatched. 2201: # $tail - The remainder of the command that, in this case, consists 2202: # of a colon separated list of: 2203: # domain - The domain in which the course database is 2204: # defined. 2205: # since - Optional parameter describing the minimum 2206: # time of definition(?) of the resources that 2207: # will match the dump. 2208: # description - regular expression that is used to filter 2209: # the dump. Only keywords matching this regexp 2210: # will be used. 2211: # $client - The socket open on the client. 2212: # Returns: 2213: # 1 - Continue processing. 2214: # Side Effects: 2215: # a reply is written to $client. 2216: sub DumpCourseIdHandler { 2217: my $cmd = shift; 2218: my $tail = shift; 2219: my $client = shift; 2220: 2221: my $userinput = "$cmd:$tail"; 2222: 2223: my ($udom,$since,$description) =split(/:/,$tail); 2224: if (defined($description)) { 2225: $description=&unescape($description); 2226: } else { 2227: $description='.'; 2228: } 2229: unless (defined($since)) { $since=0; } 2230: my $qresult=''; 2231: logthis(" Looking for $description since $since"); 2232: my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT()); 2233: if ($hashref) { 2234: while (my ($key,$value) = each(%$hashref)) { 2235: my ($descr,$lasttime)=split(/\:/,$value); 2236: logthis("Got: key = $key descr = $descr time: $lasttime"); 2237: if ($lasttime<$since) { 2238: logthis("Skipping .. too early"); 2239: next; 2240: } 2241: if ($description eq '.') { 2242: logthis("Adding wildcard match"); 2243: $qresult.=$key.'='.$descr.'&'; 2244: } else { 2245: my $unescapeVal = &unescape($descr); 2246: logthis("Matching with $unescapeVal"); 2247: if (eval('$unescapeVal=~/$description/i')) { 2248: logthis("Adding on match"); 2249: $qresult.="$key=$descr&"; 2250: } 2251: } 2252: } 2253: if (untie(%$hashref)) { 2254: chop($qresult); 2255: Reply($client, "$qresult\n", $userinput); 2256: } else { 2257: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2258: "while attempting courseiddump\n", $userinput); 2259: } 2260: } else { 2261: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2262: "while attempting courseiddump\n", $userinput); 2263: } 2264: 2265: 2266: return 1; 2267: } 2268: RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0); 2269: # 2270: # Puts an id to a domains id database. 2271: # 2272: # Parameters: 2273: # $cmd - The command that triggered us. 2274: # $tail - Remainder of the request other than the command. This is a 2275: # colon separated list containing: 2276: # $domain - The domain for which we are writing the id. 2277: # $pairs - The id info to write... this is and & separated list 2278: # of keyword=value. 2279: # $client - Socket open on the client. 2280: # Returns: 2281: # 1 - Continue processing. 2282: # Side effects: 2283: # reply is written to $client. 2284: # 2285: sub PutIdHandler { 2286: my $cmd = shift; 2287: my $tail = shift; 2288: my $client = shift; 2289: 2290: my $userinput = "$cmd:$tail"; 2291: 2292: my ($udom,$what)=split(/:/,$tail); 2293: chomp($what); 2294: my @pairs=split(/\&/,$what); 2295: my $hashref = TieDomainHash($udom, "ids", &GDBM_WRCREAT(), 2296: "P", $what); 2297: if ($hashref) { 2298: foreach my $pair (@pairs) { 2299: my ($key,$value)=split(/=/,$pair); 2300: $hashref->{$key}=$value; 2301: } 2302: if (untie(%$hashref)) { 2303: Reply($client, "ok\n", $userinput); 2304: } else { 2305: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2306: "while attempting idput\n", $userinput); 2307: } 2308: } else { 2309: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2310: "while attempting idput\n", $userinput); 2311: } 2312: 2313: return 1; 2314: } 2315: 2316: RegisterHandler("idput", \&PutIdHandler, 0, 1, 0); 2317: # 2318: # Retrieves a set of id values from the id database. 2319: # Returns an & separated list of results, one for each requested id to the 2320: # client. 2321: # 2322: # Parameters: 2323: # $cmd - Command keyword that caused us to be dispatched. 2324: # $tail - Tail of the command. Consists of a colon separated: 2325: # domain - the domain whose id table we dump 2326: # ids Consists of an & separated list of 2327: # id keywords whose values will be fetched. 2328: # nonexisting keywords will have an empty value. 2329: # $client - Socket open on the client. 2330: # 2331: # Returns: 2332: # 1 - indicating processing should continue. 2333: # Side effects: 2334: # An & separated list of results is written to $client. 2335: # 2336: sub GetIdHandler { 2337: my $cmd = shift; 2338: my $tail = shift; 2339: my $client = shift; 2340: 2341: my $userinput = "$client:$tail"; 2342: 2343: my ($udom,$what)=split(/:/,$tail); 2344: chomp($what); 2345: my @queries=split(/\&/,$what); 2346: my $qresult=''; 2347: my $hashref = TieDomainHash($udom, "ids", &GDBM_READER()); 2348: if ($hashref) { 2349: for (my $i=0;$i<=$#queries;$i++) { 2350: $qresult.="$hashref->{$queries[$i]}&"; 2351: } 2352: if (untie(%$hashref)) { 2353: $qresult=~s/\&$//; 2354: Reply($client, "$qresult\n", $userinput); 2355: } else { 2356: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 2357: "while attempting idget\n",$userinput); 2358: } 2359: } else { 2360: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2361: "while attempting idget\n",$userinput); 2362: } 2363: 2364: return 1; 2365: } 2366: 2367: RegisterHandler("idget", \&GetIdHandler, 0, 1, 0); 2368: # 2369: # Process the tmpput command I'm not sure what this does.. Seems to 2370: # create a file in the lonDaemons/tmp directory of the form $id.tmp 2371: # where Id is the client's ip concatenated with a sequence number. 2372: # The file will contain some value that is passed in. Is this e.g. 2373: # a login token? 2374: # 2375: # Parameters: 2376: # $cmd - The command that got us dispatched. 2377: # $tail - The remainder of the request following $cmd: 2378: # In this case this will be the contents of the file. 2379: # $client - Socket connected to the client. 2380: # Returns: 2381: # 1 indicating processing can continue. 2382: # Side effects: 2383: # A file is created in the local filesystem. 2384: # A reply is sent to the client. 2385: sub TmpPutHandler { 2386: my $cmd = shift; 2387: my $what = shift; 2388: my $client = shift; 2389: 2390: my $userinput = "$cmd:$what"; # Reconstruct for logging. 2391: 2392: 2393: my $store; 2394: $tmpsnum++; 2395: my $id=$$.'_'.$clientip.'_'.$tmpsnum; 2396: $id=~s/\W/\_/g; 2397: $what=~s/\n//g; 2398: my $execdir=$perlvar{'lonDaemons'}; 2399: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) { 2400: print $store $what; 2401: close $store; 2402: Reply($client, "$id\n", $userinput); 2403: } else { 2404: Failure( $client, "error: ".($!+0)."IO::File->new Failed ". 2405: "while attempting tmpput\n", $userinput); 2406: } 2407: return 1; 2408: 2409: } 2410: RegisterHandler("tmpput", \&TmpPutHandler, 0, 1, 0); 2411: 2412: # Processes the tmpget command. This command returns the contents 2413: # of a temporary resource file(?) created via tmpput. 2414: # 2415: # Paramters: 2416: # $cmd - Command that got us dispatched. 2417: # $id - Tail of the command, contain the id of the resource 2418: # we want to fetch. 2419: # $client - socket open on the client. 2420: # Return: 2421: # 1 - Inidcating processing can continue. 2422: # Side effects: 2423: # A reply is sent to the client. 2424: 2425: # 2426: sub TmpGetHandler { 2427: my $cmd = shift; 2428: my $id = shift; 2429: my $client = shift; 2430: my $userinput = "$cmd:$id"; 2431: 2432: chomp($id); 2433: $id=~s/\W/\_/g; 2434: my $store; 2435: my $execdir=$perlvar{'lonDaemons'}; 2436: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) { 2437: my $reply=<$store>; 2438: Reply( $client, "$reply\n", $userinput); 2439: close $store; 2440: } else { 2441: Failure( $client, "error: ".($!+0)."IO::File->new Failed ". 2442: "while attempting tmpget\n", $userinput); 2443: } 2444: 2445: return 1; 2446: } 2447: RegisterHandler("tmpget", \&TmpGetHandler, 0, 1, 0); 2448: # 2449: # Process the tmpdel command. This command deletes a temp resource 2450: # created by the tmpput command. 2451: # 2452: # Parameters: 2453: # $cmd - Command that got us here. 2454: # $id - Id of the temporary resource created. 2455: # $client - socket open on the client process. 2456: # 2457: # Returns: 2458: # 1 - Indicating processing should continue. 2459: # Side Effects: 2460: # A file is deleted 2461: # A reply is sent to the client. 2462: sub TmpDelHandler { 2463: my $cmd = shift; 2464: my $id = shift; 2465: my $client = shift; 2466: 2467: my $userinput= "$cmd:$id"; 2468: 2469: chomp($id); 2470: $id=~s/\W/\_/g; 2471: my $execdir=$perlvar{'lonDaemons'}; 2472: if (unlink("$execdir/tmp/$id.tmp")) { 2473: Reply($client, "ok\n", $userinput); 2474: } else { 2475: Failure( $client, "error: ".($!+0)."Unlink tmp Failed ". 2476: "while attempting tmpdel\n", $userinput); 2477: } 2478: 2479: return 1; 2480: 2481: } 2482: RegisterHandler("tmpdel", \&TmpDelHandler, 0, 1, 0); 2483: # 2484: # ls - list the contents of a directory. For each file in the 2485: # selected directory the filename followed by the full output of 2486: # the stat function is returned. The returned info for each 2487: # file are separated by ':'. The stat fields are separated by &'s. 2488: # Parameters: 2489: # $cmd - The command that dispatched us (ls). 2490: # $ulsdir - The directory path to list... I'm not sure what this 2491: # is relative as things like ls:. return e.g. 2492: # no_such_dir. 2493: # $client - Socket open on the client. 2494: # Returns: 2495: # 1 - indicating that the daemon should not disconnect. 2496: # Side Effects: 2497: # The reply is written to $client. 2498: # 2499: sub LsHandler { 2500: my $cmd = shift; 2501: my $ulsdir = shift; 2502: my $client = shift; 2503: 2504: my $userinput = "$cmd:$ulsdir"; 2505: 2506: chomp($ulsdir); 2507: 2508: my $ulsout=''; 2509: my $ulsfn; 2510: logthis("ls for '$ulsdir'"); 2511: if (-e $ulsdir) { 2512: logthis("ls - directory exists"); 2513: if(-d $ulsdir) { 2514: logthis("ls $ulsdir is a file"); 2515: if (opendir(LSDIR,$ulsdir)) { 2516: while ($ulsfn=readdir(LSDIR)) { 2517: my @ulsstats=stat($ulsdir.'/'.$ulsfn); 2518: $ulsout.=$ulsfn.'&'. 2519: join('&',@ulsstats).':'; 2520: } 2521: closedir(LSDIR); 2522: } 2523: } else { 2524: my @ulsstats=stat($ulsdir); 2525: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':'; 2526: } 2527: } else { 2528: $ulsout='no_such_dir'; 2529: } 2530: if ($ulsout eq '') { $ulsout='empty'; } 2531: Reply($client, "$ulsout\n", $userinput); 2532: 2533: 2534: return 1; 2535: } 2536: RegisterHandler("ls", \&LsHandler, 0, 1, 0); 2537: 2538: 2539: # 2540: # Processes the setannounce command. This command 2541: # creates a file named announce.txt in the top directory of 2542: # the documentn root and sets its contents. The announce.txt file is 2543: # printed in its entirety at the LonCAPA login page. Note: 2544: # once the announcement.txt fileis created it cannot be deleted. 2545: # However, setting the contents of the file to empty removes the 2546: # announcement from the login page of loncapa so who cares. 2547: # 2548: # Parameters: 2549: # $cmd - The command that got us dispatched. 2550: # $announcement - The text of the announcement. 2551: # $client - Socket open on the client process. 2552: # Retunrns: 2553: # 1 - Indicating request processing should continue 2554: # Side Effects: 2555: # The file {DocRoot}/announcement.txt is created. 2556: # A reply is sent to $client. 2557: # 2558: sub SetAnnounceHandler { 2559: my $cmd = shift; 2560: my $announcement = shift; 2561: my $client = shift; 2562: 2563: my $userinput = "$cmd:$announcement"; 2564: 2565: chomp($announcement); 2566: $announcement=&unescape($announcement); 2567: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}. 2568: '/announcement.txt')) { 2569: print $store $announcement; 2570: close $store; 2571: Reply($client, "ok\n", $userinput); 2572: } else { 2573: Failure($client, "error: ".($!+0)."\n", $userinput); 2574: } 2575: 2576: return 1; 2577: } 2578: RegisterHandler("setannounce", \&SetAnnounceHandler, 0, 1, 0); 2579: 2580: # 2581: # Return the version of the daemon. This can be used to determine 2582: # the compatibility of cross version installations or, alternatively to 2583: # simply know who's out of date and who isn't. Note that the version 2584: # is returned concatenated with the tail. 2585: # Parameters: 2586: # $cmd - the request that dispatched to us. 2587: # $tail - Tail of the request (client's version?). 2588: # $client - Socket open on the client. 2589: #Returns: 2590: # 1 - continue processing requests. 2591: # Side Effects: 2592: # Replies with version to $client. 2593: sub GetVersionHandler { 2594: my $client = shift; 2595: my $tail = shift; 2596: my $client = shift; 2597: my $userinput = $client; 2598: 2599: Reply($client, &version($userinput)."\n", $userinput); 2600: 2601: 2602: return 1; 2603: } 2604: RegisterHandler("version", \&GetVersionHandler, 0, 1, 0); 2605: 2606: # Set the current host and domain. This is used to support 2607: # multihomed systems. Each IP of the system, or even separate daemons 2608: # on the same IP can be treated as handling a separate lonCAPA virtual 2609: # machine. This command selects the virtual lonCAPA. The client always 2610: # knows the right one since it is lonc and it is selecting the domain/system 2611: # from the hosts.tab file. 2612: # Parameters: 2613: # $cmd - Command that dispatched us. 2614: # $tail - Tail of the command (domain/host requested). 2615: # $socket - Socket open on the client. 2616: # 2617: # Returns: 2618: # 1 - Indicates the program should continue to process requests. 2619: # Side-effects: 2620: # The default domain/system context is modified for this daemon. 2621: # a reply is sent to the client. 2622: # 2623: sub SelectHostHandler { 2624: my $cmd = shift; 2625: my $tail = shift; 2626: my $socket = shift; 2627: 2628: my $userinput ="$cmd:$tail"; 2629: 2630: Reply($client, &sethost($userinput)."\n", $userinput); 2631: 2632: 2633: return 1; 2634: } 2635: RegisterHandler("sethost", \&SelectHostHandler, 0, 1, 0); 2636: 2637: # Process a request to exit: 2638: # - "bye" is sent to the client. 2639: # - The client socket is shutdown and closed. 2640: # - We indicate to the caller that we should exit. 2641: # Formal Parameters: 2642: # $cmd - The command that got us here. 2643: # $tail - Tail of the command (empty). 2644: # $client - Socket open on the tail. 2645: # Returns: 2646: # 0 - Indicating the program should exit!! 2647: # 2648: sub ExitHandler { 2649: my $cmd = shift; 2650: my $tail = shift; 2651: my $client = shift; 2652: 2653: my $userinput = "$cmd:$tail"; 2654: 2655: &logthis("Client $clientip ($clientname) hanging up: $userinput"); 2656: Reply($client, "bye\n", $userinput); 2657: $client->shutdown(2); # shutdown the socket forcibly. 2658: $client->close(); 2659: 2660: return 0; 2661: } 2662: RegisterHandler("exit", \&ExitHandler, 0, 1,1); 2663: RegisterHandler("init", \&ExitHandler, 0, 1,1); # RE-init is like exit. 2664: RegisterHandler("quit", \&ExitHandler, 0, 1,1); # I like this too! 2665: #------------------------------------------------------------------------------------ 2666: # 2667: # Process a Request. Takes a request from the client validates 2668: # it and performs the operation requested by it. Returns 2669: # a response to the client. 2670: # 2671: # Parameters: 2672: # request - A string containing the user's request. 2673: # Returns: 2674: # 0 - Requested to exit, caller should shut down. 2675: # 1 - Accept additional requests from the client. 2676: # 2677: sub ProcessRequest { 2678: my $Request = shift; 2679: my $KeepGoing = 1; # Assume we're not asked to stop. 2680: 2681: my $wasenc=0; 2682: my $userinput = $Request; # for compatibility with oldcode <yeach> 2683: 2684: 2685: # ------------------------------------------------------------ See if encrypted 2686: 2687: if($userinput =~ /^enc/) { 2688: $wasenc = 1; 2689: $userinput = Decipher($userinput); 2690: if(! $userinput) { 2691: Failure($client,"error:Encrypted data without negotiating key"); 2692: return 0; # Break off with this imposter. 2693: } 2694: } 2695: # Split off the request keyword from the rest of the stuff. 2696: 2697: my ($command, $tail) = split(/:/, $userinput, 2); 2698: chomp($command); 2699: chomp($tail); 2700: 2701: Debug("Command received: $command, encoded = $wasenc"); 2702: 2703: 2704: # ------------------------------------------------------------- Normal commands 2705: 2706: # 2707: # If the command is in the hash, then execute it via the hash dispatch: 2708: # 2709: if(defined $Dispatcher{$command}) { 2710: 2711: my $DispatchInfo = $Dispatcher{$command}; 2712: my $Handler = $$DispatchInfo[0]; 2713: my $NeedEncode = $$DispatchInfo[1]; 2714: my $ClientTypes = $$DispatchInfo[2]; 2715: Debug("Matched dispatch hash: mustencode: $NeedEncode ClientType $ClientTypes"); 2716: 2717: # Validate the request: 2718: 2719: my $ok = 1; 2720: my $requesterprivs = 0; 2721: if(isClient()) { 2722: $requesterprivs |= $CLIENT_OK; 2723: } 2724: if(isManager()) { 2725: $requesterprivs |= $MANAGER_OK; 2726: } 2727: if($NeedEncode && (!$wasenc)) { 2728: Debug("Must encode but wasn't: $NeedEncode $wasenc"); 2729: $ok = 0; 2730: } 2731: if(($ClientTypes & $requesterprivs) == 0) { 2732: Debug("Client not privileged to do this operation"); 2733: $ok = 0; 2734: } 2735: 2736: if($ok) { 2737: Debug("Dispatching to handler $command $tail"); 2738: $KeepGoing = &$Handler($command, $tail, $client); 2739: } else { 2740: Debug("Refusing to dispatch because ok is false"); 2741: Failure($client, "refused\n", $userinput); 2742: } 2743: 2744: 2745: # ------------------------------------------------------------- unknown command 2746: 2747: } else { 2748: # unknown command 2749: Failure($client, "unknown_cmd\n", $userinput); 2750: } 2751: 2752: return $KeepGoing; 2753: } 2754: 2755: 2756: # 2757: # GetCertificate: Given a transaction that requires a certificate, 2758: # this function will extract the certificate from the transaction 2759: # request. Note that at this point, the only concept of a certificate 2760: # is the hostname to which we are connected. 2761: # 2762: # Parameter: 2763: # request - The request sent by our client (this parameterization may 2764: # need to change when we really use a certificate granting 2765: # authority. 2766: # 2767: sub GetCertificate { 2768: my $request = shift; 2769: 2770: return $clientip; 2771: } 2772: 2773: 2774: 2775: # 2776: # ReadManagerTable: Reads in the current manager table. For now this is 2777: # done on each manager authentication because: 2778: # - These authentications are not frequent 2779: # - This allows dynamic changes to the manager table 2780: # without the need to signal to the lond. 2781: # 2782: 2783: sub ReadManagerTable { 2784: 2785: # Clean out the old table first.. 2786: 2787: foreach my $key (keys %managers) { 2788: delete $managers{$key}; 2789: } 2790: 2791: my $tablename = $perlvar{'lonTabDir'}."/managers.tab"; 2792: if (!open (MANAGERS, $tablename)) { 2793: logthis('No manager table. Nobody can manage!!'); 2794: return; 2795: } 2796: while(my $host = <MANAGERS>) { 2797: chomp($host); 2798: if ($host =~ "^#") { # Comment line. 2799: logthis(' Skipping line: '. "$host\n"); 2800: next; 2801: } 2802: if (!defined $hostip{$host}) { # This is a non cluster member 2803: # The entry is of the form: 2804: # cluname:hostname 2805: # cluname - A 'cluster hostname' is needed in order to negotiate 2806: # the host key. 2807: # hostname- The dns name of the host. 2808: # 2809: my($cluname, $dnsname) = split(/:/, $host); 2810: 2811: my $ip = gethostbyname($dnsname); 2812: if(defined($ip)) { # bad names don't deserve entry. 2813: my $hostip = inet_ntoa($ip); 2814: $managers{$hostip} = $cluname; 2815: logthis(' registering manager '. 2816: "$dnsname as $cluname with $hostip \n"); 2817: } 2818: } else { 2819: logthis(' existing host'." $host\n"); 2820: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber 2821: } 2822: } 2823: } 2824: 2825: # 2826: # ValidManager: Determines if a given certificate represents a valid manager. 2827: # in this primitive implementation, the 'certificate' is 2828: # just the connecting loncapa client name. This is checked 2829: # against a valid client list in the configuration. 2830: # 2831: # 2832: sub ValidManager { 2833: my $certificate = shift; 2834: 2835: return isManager; 2836: } 2837: # 2838: # CopyFile: Called as part of the process of installing a 2839: # new configuration file. This function copies an existing 2840: # file to a backup file. 2841: # Parameters: 2842: # oldfile - Name of the file to backup. 2843: # newfile - Name of the backup file. 2844: # Return: 2845: # 0 - Failure (errno has failure reason). 2846: # 1 - Success. 2847: # 2848: sub CopyFile { 2849: my $oldfile = shift; 2850: my $newfile = shift; 2851: 2852: # The file must exist: 2853: 2854: if(-e $oldfile) { 2855: 2856: # Read the old file. 2857: 2858: my $oldfh = IO::File->new("< $oldfile"); 2859: if(!$oldfh) { 2860: return 0; 2861: } 2862: my @contents = <$oldfh>; # Suck in the entire file. 2863: 2864: # write the backup file: 2865: 2866: my $newfh = IO::File->new("> $newfile"); 2867: if(!(defined $newfh)){ 2868: return 0; 2869: } 2870: my $lines = scalar @contents; 2871: for (my $i =0; $i < $lines; $i++) { 2872: print $newfh ($contents[$i]); 2873: } 2874: 2875: $oldfh->close; 2876: $newfh->close; 2877: 2878: chmod(0660, $newfile); 2879: 2880: return 1; 2881: 2882: } else { 2883: return 0; 2884: } 2885: } 2886: # 2887: # Host files are passed out with externally visible host IPs. 2888: # If, for example, we are behind a fire-wall or NAT host, our 2889: # internally visible IP may be different than the externally 2890: # visible IP. Therefore, we always adjust the contents of the 2891: # host file so that the entry for ME is the IP that we believe 2892: # we have. At present, this is defined as the entry that 2893: # DNS has for us. If by some chance we are not able to get a 2894: # DNS translation for us, then we assume that the host.tab file 2895: # is correct. 2896: # BUGBUGBUG - in the future, we really should see if we can 2897: # easily query the interface(s) instead. 2898: # Parameter(s): 2899: # contents - The contents of the host.tab to check. 2900: # Returns: 2901: # newcontents - The adjusted contents. 2902: # 2903: # 2904: sub AdjustHostContents { 2905: my $contents = shift; 2906: my $adjusted; 2907: my $me = $perlvar{'lonHostID'}; 2908: 2909: foreach my $line (split(/\n/,$contents)) { 2910: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) { 2911: chomp($line); 2912: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line); 2913: if ($id eq $me) { 2914: my $ip = gethostbyname($name); 2915: my $ipnew = inet_ntoa($ip); 2916: $ip = $ipnew; 2917: # Reconstruct the host line and append to adjusted: 2918: 2919: my $newline = "$id:$domain:$role:$name:$ip"; 2920: if($maxcon ne "") { # Not all hosts have loncnew tuning params 2921: $newline .= ":$maxcon:$idleto:$mincon"; 2922: } 2923: $adjusted .= $newline."\n"; 2924: 2925: } else { # Not me, pass unmodified. 2926: $adjusted .= $line."\n"; 2927: } 2928: } else { # Blank or comment never re-written. 2929: $adjusted .= $line."\n"; # Pass blanks and comments as is. 2930: } 2931: } 2932: return $adjusted; 2933: } 2934: # 2935: # InstallFile: Called to install an administrative file: 2936: # - The file is created with <name>.tmp 2937: # - The <name>.tmp file is then mv'd to <name> 2938: # This lugubrious procedure is done to ensure that we are never without 2939: # a valid, even if dated, version of the file regardless of who crashes 2940: # and when the crash occurs. 2941: # 2942: # Parameters: 2943: # Name of the file 2944: # File Contents. 2945: # Return: 2946: # nonzero - success. 2947: # 0 - failure and $! has an errno. 2948: # 2949: sub InstallFile { 2950: my $Filename = shift; 2951: my $Contents = shift; 2952: my $TempFile = $Filename.".tmp"; 2953: 2954: # Open the file for write: 2955: 2956: my $fh = IO::File->new("> $TempFile"); # Write to temp. 2957: if(!(defined $fh)) { 2958: &logthis(' Unable to create '.$TempFile.""); 2959: return 0; 2960: } 2961: # write the contents of the file: 2962: 2963: print $fh ($Contents); 2964: $fh->close; # In case we ever have a filesystem w. locking 2965: 2966: chmod(0660, $TempFile); 2967: 2968: # Now we can move install the file in position. 2969: 2970: move($TempFile, $Filename); 2971: 2972: return 1; 2973: } 2974: # 2975: # ConfigFileFromSelector: converts a configuration file selector 2976: # (one of host or domain at this point) into a 2977: # configuration file pathname. 2978: # 2979: # Parameters: 2980: # selector - Configuration file selector. 2981: # Returns: 2982: # Full path to the file or undef if the selector is invalid. 2983: # 2984: sub ConfigFileFromSelector { 2985: my $selector = shift; 2986: my $tablefile; 2987: 2988: my $tabledir = $perlvar{'lonTabDir'}.'/'; 2989: if ($selector eq "hosts") { 2990: $tablefile = $tabledir."hosts.tab"; 2991: } elsif ($selector eq "domain") { 2992: $tablefile = $tabledir."domain.tab"; 2993: } else { 2994: return undef; 2995: } 2996: return $tablefile; 2997: 2998: } 2999: # 3000: # PushFile: Called to do an administrative push of a file. 3001: # - Ensure the file being pushed is one we support. 3002: # - Backup the old file to <filename.saved> 3003: # - Separate the contents of the new file out from the 3004: # rest of the request. 3005: # - Write the new file. 3006: # Parameter: 3007: # Request - The entire user request. This consists of a : separated 3008: # string pushfile:tablename:contents. 3009: # NOTE: The contents may have :'s in it as well making things a bit 3010: # more interesting... but not much. 3011: # Returns: 3012: # String to send to client ("ok" or "refused" if bad file). 3013: # 3014: sub PushFile { 3015: my $request = shift; 3016: my ($command, $filename, $contents) = split(":", $request, 3); 3017: 3018: # At this point in time, pushes for only the following tables are 3019: # supported: 3020: # hosts.tab ($filename eq host). 3021: # domain.tab ($filename eq domain). 3022: # Construct the destination filename or reject the request. 3023: # 3024: # lonManage is supposed to ensure this, however this session could be 3025: # part of some elaborate spoof that managed somehow to authenticate. 3026: # 3027: 3028: 3029: my $tablefile = ConfigFileFromSelector($filename); 3030: if(! (defined $tablefile)) { 3031: return "refused"; 3032: } 3033: # 3034: # >copy< the old table to the backup table 3035: # don't rename in case system crashes/reboots etc. in the time 3036: # window between a rename and write. 3037: # 3038: my $backupfile = $tablefile; 3039: $backupfile =~ s/\.tab$/.old/; 3040: if(!CopyFile($tablefile, $backupfile)) { 3041: &logthis(' CopyFile from '.$tablefile." to ".$backupfile." failed "); 3042: return "error:$!"; 3043: } 3044: &logthis(' Pushfile: backed up ' 3045: .$tablefile." to $backupfile"); 3046: 3047: # If the file being pushed is the host file, we adjust the entry for ourself so that the 3048: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible 3049: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a 3050: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now) 3051: # that possibilty. 3052: 3053: if($filename eq "host") { 3054: $contents = AdjustHostContents($contents); 3055: } 3056: 3057: # Install the new file: 3058: 3059: if(!InstallFile($tablefile, $contents)) { 3060: &logthis(' Pushfile: unable to install ' 3061: .$tablefile." $! "); 3062: return "error:$!"; 3063: } else { 3064: &logthis(' Installed new '.$tablefile 3065: .""); 3066: 3067: } 3068: 3069: 3070: # Indicate success: 3071: 3072: return "ok"; 3073: 3074: } 3075: 3076: # 3077: # Called to re-init either lonc or lond. 3078: # 3079: # Parameters: 3080: # request - The full request by the client. This is of the form 3081: # reinit:<process> 3082: # where <process> is allowed to be either of 3083: # lonc or lond 3084: # 3085: # Returns: 3086: # The string to be sent back to the client either: 3087: # ok - Everything worked just fine. 3088: # error:why - There was a failure and why describes the reason. 3089: # 3090: # 3091: sub ReinitProcess { 3092: my $request = shift; 3093: 3094: 3095: # separate the request (reinit) from the process identifier and 3096: # validate it producing the name of the .pid file for the process. 3097: # 3098: # 3099: my ($junk, $process) = split(":", $request); 3100: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/'; 3101: if($process eq 'lonc') { 3102: $processpidfile = $processpidfile."lonc.pid"; 3103: if (!open(PIDFILE, "< $processpidfile")) { 3104: return "error:Open failed for $processpidfile"; 3105: } 3106: my $loncpid = <PIDFILE>; 3107: close(PIDFILE); 3108: logthis(' Reinitializing lonc pid='.$loncpid 3109: .""); 3110: kill("USR2", $loncpid); 3111: } elsif ($process eq 'lond') { 3112: logthis(' Reinitializing self (lond) '); 3113: &UpdateHosts; # Lond is us!! 3114: } else { 3115: &logthis('"); 3117: return "error:Invalid process identifier $process"; 3118: } 3119: return 'ok'; 3120: } 3121: # Validate a line in a configuration file edit script: 3122: # Validation includes: 3123: # - Ensuring the command is valid. 3124: # - Ensuring the command has sufficient parameters 3125: # Parameters: 3126: # scriptline - A line to validate (\n has been stripped for what it's worth). 3127: # 3128: # Return: 3129: # 0 - Invalid scriptline. 3130: # 1 - Valid scriptline 3131: # NOTE: 3132: # Only the command syntax is checked, not the executability of the 3133: # command. 3134: # 3135: sub isValidEditCommand { 3136: my $scriptline = shift; 3137: 3138: # Line elements are pipe separated: 3139: 3140: my ($command, $key, $newline) = split(/\|/, $scriptline); 3141: &logthis(' isValideditCommand checking: '. 3142: "Command = '$command', Key = '$key', Newline = '$newline' \n"); 3143: 3144: if ($command eq "delete") { 3145: # 3146: # key with no newline. 3147: # 3148: if( ($key eq "") || ($newline ne "")) { 3149: return 0; # Must have key but no newline. 3150: } else { 3151: return 1; # Valid syntax. 3152: } 3153: } elsif ($command eq "replace") { 3154: # 3155: # key and newline: 3156: # 3157: if (($key eq "") || ($newline eq "")) { 3158: return 0; 3159: } else { 3160: return 1; 3161: } 3162: } elsif ($command eq "append") { 3163: if (($key ne "") && ($newline eq "")) { 3164: return 1; 3165: } else { 3166: return 0; 3167: } 3168: } else { 3169: return 0; # Invalid command. 3170: } 3171: return 0; # Should not get here!!! 3172: } 3173: # 3174: # ApplyEdit - Applies an edit command to a line in a configuration 3175: # file. It is the caller's responsiblity to validate the 3176: # edit line. 3177: # Parameters: 3178: # $directive - A single edit directive to apply. 3179: # Edit directives are of the form: 3180: # append|newline - Appends a new line to the file. 3181: # replace|key|newline - Replaces the line with key value 'key' 3182: # delete|key - Deletes the line with key value 'key'. 3183: # $editor - A config file editor object that contains the 3184: # file being edited. 3185: # 3186: sub ApplyEdit { 3187: my $directive = shift; 3188: my $editor = shift; 3189: 3190: # Break the directive down into its command and its parameters 3191: # (at most two at this point. The meaning of the parameters, if in fact 3192: # they exist depends on the command). 3193: 3194: my ($command, $p1, $p2) = split(/\|/, $directive); 3195: 3196: if($command eq "append") { 3197: $editor->Append($p1); # p1 - key p2 null. 3198: } elsif ($command eq "replace") { 3199: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline. 3200: } elsif ($command eq "delete") { 3201: $editor->DeleteLine($p1); # p1 - key p2 null. 3202: } else { # Should not get here!!! 3203: die "Invalid command given to ApplyEdit $command"; 3204: } 3205: } 3206: # 3207: # AdjustOurHost: 3208: # Adjusts a host file stored in a configuration file editor object 3209: # for the true IP address of this host. This is necessary for hosts 3210: # that live behind a firewall. 3211: # Those hosts have a publicly distributed IP of the firewall, but 3212: # internally must use their actual IP. We assume that a given 3213: # host only has a single IP interface for now. 3214: # Formal Parameters: 3215: # editor - The configuration file editor to adjust. This 3216: # editor is assumed to contain a hosts.tab file. 3217: # Strategy: 3218: # - Figure out our hostname. 3219: # - Lookup the entry for this host. 3220: # - Modify the line to contain our IP 3221: # - Do a replace for this host. 3222: sub AdjustOurHost { 3223: my $editor = shift; 3224: 3225: # figure out who I am. 3226: 3227: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname. 3228: 3229: # Get my host file entry. 3230: 3231: my $ConfigLine = $editor->Find($myHostName); 3232: if(! (defined $ConfigLine)) { 3233: die "AdjustOurHost - no entry for me in hosts file $myHostName"; 3234: } 3235: # figure out my IP: 3236: # Use the config line to get my hostname. 3237: # Use gethostbyname to translate that into an IP address. 3238: # 3239: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine); 3240: my $BinaryIp = gethostbyname($name); 3241: my $ip = inet_ntoa($ip); 3242: # 3243: # Reassemble the config line from the elements in the list. 3244: # Note that if the loncnew items were not present before, they will 3245: # be now even if they would be empty 3246: # 3247: my $newConfigLine = $id; 3248: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) { 3249: $newConfigLine .= ":".$item; 3250: } 3251: # Replace the line: 3252: 3253: $editor->ReplaceLine($id, $newConfigLine); 3254: 3255: } 3256: # 3257: # ReplaceConfigFile: 3258: # Replaces a configuration file with the contents of a 3259: # configuration file editor object. 3260: # This is done by: 3261: # - Copying the target file to <filename>.old 3262: # - Writing the new file to <filename>.tmp 3263: # - Moving <filename.tmp> -> <filename> 3264: # This laborious process ensures that the system is never without 3265: # a configuration file that's at least valid (even if the contents 3266: # may be dated). 3267: # Parameters: 3268: # filename - Name of the file to modify... this is a full path. 3269: # editor - Editor containing the file. 3270: # 3271: sub ReplaceConfigFile { 3272: my $filename = shift; 3273: my $editor = shift; 3274: 3275: CopyFile ($filename, $filename.".old"); 3276: 3277: my $contents = $editor->Get(); # Get the contents of the file. 3278: 3279: InstallFile($filename, $contents); 3280: } 3281: # 3282: # 3283: # Called to edit a configuration table file 3284: # Parameters: 3285: # request - The entire command/request sent by lonc or lonManage 3286: # Return: 3287: # The reply to send to the client. 3288: # 3289: sub EditFile { 3290: my $request = shift; 3291: 3292: # Split the command into it's pieces: edit:filetype:script 3293: 3294: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script 3295: 3296: # Check the pre-coditions for success: 3297: 3298: if($request != "edit") { # Something is amiss afoot alack. 3299: return "error:edit request detected, but request != 'edit'\n"; 3300: } 3301: if( ($filetype ne "hosts") && 3302: ($filetype ne "domain")) { 3303: return "error:edit requested with invalid file specifier: $filetype \n"; 3304: } 3305: 3306: # Split the edit script and check it's validity. 3307: 3308: my @scriptlines = split(/\n/, $script); # one line per element. 3309: my $linecount = scalar(@scriptlines); 3310: for(my $i = 0; $i < $linecount; $i++) { 3311: chomp($scriptlines[$i]); 3312: if(!isValidEditCommand($scriptlines[$i])) { 3313: return "error:edit with bad script line: '$scriptlines[$i]' \n"; 3314: } 3315: } 3316: 3317: # Execute the edit operation. 3318: # - Create a config file editor for the appropriate file and 3319: # - execute each command in the script: 3320: # 3321: my $configfile = ConfigFileFromSelector($filetype); 3322: if (!(defined $configfile)) { 3323: return "refused\n"; 3324: } 3325: my $editor = ConfigFileEdit->new($configfile); 3326: 3327: for (my $i = 0; $i < $linecount; $i++) { 3328: ApplyEdit($scriptlines[$i], $editor); 3329: } 3330: # If the file is the host file, ensure that our host is 3331: # adjusted to have our ip: 3332: # 3333: if($filetype eq "host") { 3334: AdjustOurHost($editor); 3335: } 3336: # Finally replace the current file with our file. 3337: # 3338: ReplaceConfigFile($configfile, $editor); 3339: 3340: return "ok\n"; 3341: } 3342: # 3343: # Convert an error return code from lcpasswd to a string value. 3344: # 3345: sub lcpasswdstrerror { 3346: my $ErrorCode = shift; 3347: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) { 3348: return "lcpasswd Unrecognized error return value ".$ErrorCode; 3349: } else { 3350: return $passwderrors[$ErrorCode]; 3351: } 3352: } 3353: 3354: # 3355: # Convert an error return code from lcuseradd to a string value: 3356: # 3357: sub lcuseraddstrerror { 3358: my $ErrorCode = shift; 3359: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) { 3360: return "lcuseradd - Unrecognized error code: ".$ErrorCode; 3361: } else { 3362: return $adderrors[$ErrorCode]; 3363: } 3364: } 3365: 3366: # grabs exception and records it to log before exiting 3367: sub catchexception { 3368: my ($error)=@_; 3369: $SIG{'QUIT'}='DEFAULT'; 3370: $SIG{__DIE__}='DEFAULT'; 3371: &status("Catching exception"); 3372: &logthis("CRITICAL: " 3373: ."ABNORMAL EXIT. Child $$ for server $thisserver died through " 3374: ."a crash with this error msg->[$error]"); 3375: &logthis('Famous last words: '.$status.' - '.$lastlog); 3376: if ($client) { print $client "error: $error\n"; } 3377: $server->close(); 3378: die($error); 3379: } 3380: 3381: sub timeout { 3382: &status("Handling Timeout"); 3383: &logthis("CRITICAL: TIME OUT ".$$.""); 3384: &catchexception('Timeout'); 3385: } 3386: # -------------------------------- Set signal handlers to record abnormal exits 3387: 3388: $SIG{'QUIT'}=\&catchexception; 3389: $SIG{__DIE__}=\&catchexception; 3390: 3391: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf 3392: &status("Read loncapa.conf and loncapa_apache.conf"); 3393: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf'); 3394: %perlvar=%{$perlvarref}; 3395: undef $perlvarref; 3396: 3397: # ----------------------------- Make sure this process is running from user=www 3398: my $wwwid=getpwnam('www'); 3399: if ($wwwid!=$<) { 3400: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; 3401: my $subj="LON: $currenthostid User ID mismatch"; 3402: system("echo 'User ID mismatch. lond must be run as user www.' |\ 3403: mailto $emailto -s '$subj' > /dev/null"); 3404: exit 1; 3405: } 3406: 3407: # --------------------------------------------- Check if other instance running 3408: 3409: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid"; 3410: 3411: if (-e $pidfile) { 3412: my $lfh=IO::File->new("$pidfile"); 3413: my $pide=<$lfh>; 3414: chomp($pide); 3415: if (kill 0 => $pide) { die "already running"; } 3416: } 3417: 3418: # ------------------------------------------------------------- Read hosts file 3419: 3420: 3421: 3422: # establish SERVER socket, bind and listen. 3423: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'}, 3424: Type => SOCK_STREAM, 3425: Proto => 'tcp', 3426: Reuse => 1, 3427: Listen => 10 ) 3428: or die "making socket: $@\n"; 3429: 3430: # --------------------------------------------------------- Do global variables 3431: 3432: # global variables 3433: 3434: my %children = (); # keys are current child process IDs 3435: my $children = 0; # current number of children 3436: 3437: sub REAPER { # takes care of dead children 3438: $SIG{CHLD} = \&REAPER; 3439: &status("Handling child death"); 3440: my $pid = wait; 3441: if (defined($children{$pid})) { 3442: &logthis("Child $pid died"); 3443: $children --; 3444: delete $children{$pid}; 3445: } else { 3446: &logthis("Unknown Child $pid died"); 3447: } 3448: &status("Finished Handling child death"); 3449: } 3450: 3451: sub HUNTSMAN { # signal handler for SIGINT 3452: &status("Killing children (INT)"); 3453: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children 3454: kill 'INT' => keys %children; 3455: &logthis("Free socket: ".shutdown($server,2)); # free up socket 3456: my $execdir=$perlvar{'lonDaemons'}; 3457: unlink("$execdir/logs/lond.pid"); 3458: &logthis("CRITICAL: Shutting down"); 3459: &status("Done killing children"); 3460: exit; # clean up with dignity 3461: } 3462: 3463: sub HUPSMAN { # signal handler for SIGHUP 3464: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children 3465: &status("Killing children for restart (HUP)"); 3466: kill 'INT' => keys %children; 3467: &logthis("Free socket: ".shutdown($server,2)); # free up socket 3468: &logthis("CRITICAL: Restarting"); 3469: my $execdir=$perlvar{'lonDaemons'}; 3470: unlink("$execdir/logs/lond.pid"); 3471: &status("Restarting self (HUP)"); 3472: exec("$execdir/lond"); # here we go again 3473: } 3474: 3475: # 3476: # Kill off hashes that describe the host table prior to re-reading it. 3477: # Hashes affected are: 3478: # %hostid, %hostdom %hostip 3479: # 3480: sub KillHostHashes { 3481: foreach my $key (keys %hostid) { 3482: delete $hostid{$key}; 3483: } 3484: foreach my $key (keys %hostdom) { 3485: delete $hostdom{$key}; 3486: } 3487: foreach my $key (keys %hostip) { 3488: delete $hostip{$key}; 3489: } 3490: } 3491: # 3492: # Read in the host table from file and distribute it into the various hashes: 3493: # 3494: # - %hostid - Indexed by IP, the loncapa hostname. 3495: # - %hostdom - Indexed by loncapa hostname, the domain. 3496: # - %hostip - Indexed by hostid, the Ip address of the host. 3497: sub ReadHostTable { 3498: 3499: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file"; 3500: 3501: while (my $configline=<CONFIG>) { 3502: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline); 3503: chomp($ip); $ip=~s/\D+$//; 3504: $hostid{$ip}=$id; 3505: $hostdom{$id}=$domain; 3506: $hostip{$id}=$ip; 3507: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; } 3508: } 3509: close(CONFIG); 3510: } 3511: # 3512: # Reload the Apache daemon's state. 3513: # This is done by invoking /home/httpd/perl/apachereload 3514: # a setuid perl script that can be root for us to do this job. 3515: # 3516: sub ReloadApache { 3517: my $execdir = $perlvar{'lonDaemons'}; 3518: my $script = $execdir."/apachereload"; 3519: system($script); 3520: } 3521: 3522: # 3523: # Called in response to a USR2 signal. 3524: # - Reread hosts.tab 3525: # - All children connected to hosts that were removed from hosts.tab 3526: # are killed via SIGINT 3527: # - All children connected to previously existing hosts are sent SIGUSR1 3528: # - Our internal hosts hash is updated to reflect the new contents of 3529: # hosts.tab causing connections from hosts added to hosts.tab to 3530: # now be honored. 3531: # 3532: sub UpdateHosts { 3533: &status("Reload hosts.tab"); 3534: logthis(' Updating connections '); 3535: # 3536: # The %children hash has the set of IP's we currently have children 3537: # on. These need to be matched against records in the hosts.tab 3538: # Any ip's no longer in the table get killed off they correspond to 3539: # either dropped or changed hosts. Note that the re-read of the table 3540: # will take care of new and changed hosts as connections come into being. 3541: 3542: 3543: KillHostHashes; 3544: ReadHostTable; 3545: 3546: foreach my $child (keys %children) { 3547: my $childip = $children{$child}; 3548: if(!$hostid{$childip}) { 3549: logthis(' UpdateHosts killing child ' 3550: ." $child for ip $childip "); 3551: kill('INT', $child); 3552: } else { 3553: logthis(' keeping child for ip ' 3554: ." $childip (pid=$child) "); 3555: } 3556: } 3557: ReloadApache; 3558: &status("Finished reloading hosts.tab"); 3559: } 3560: 3561: 3562: sub checkchildren { 3563: &status("Checking on the children (sending signals)"); 3564: &initnewstatus(); 3565: &logstatus(); 3566: &logthis('Going to check on the children'); 3567: my $docdir=$perlvar{'lonDocRoot'}; 3568: foreach (sort keys %children) { 3569: sleep 1; 3570: unless (kill 'USR1' => $_) { 3571: &logthis ('Child '.$_.' is dead'); 3572: &logstatus($$.' is dead'); 3573: } 3574: } 3575: sleep 5; 3576: $SIG{ALRM} = sub { die "timeout" }; 3577: $SIG{__DIE__} = 'DEFAULT'; 3578: &status("Checking on the children (waiting for reports)"); 3579: foreach (sort keys %children) { 3580: unless (-e "$docdir/lon-status/londchld/$_.txt") { 3581: eval { 3582: alarm(300); 3583: &logthis('Child '.$_.' did not respond'); 3584: kill 9 => $_; 3585: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; 3586: #$subj="LON: $currenthostid killed lond process $_"; 3587: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`; 3588: #$execdir=$perlvar{'lonDaemons'}; 3589: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`; 3590: alarm(0); 3591: } 3592: } 3593: } 3594: $SIG{ALRM} = 'DEFAULT'; 3595: $SIG{__DIE__} = \&catchexception; 3596: &status("Finished checking children"); 3597: } 3598: 3599: # --------------------------------------------------------------------- Logging 3600: 3601: sub logthis { 3602: my $message=shift; 3603: my $execdir=$perlvar{'lonDaemons'}; 3604: my $fh=IO::File->new(">>$execdir/logs/lond.log"); 3605: my $now=time; 3606: my $local=localtime($now); 3607: $lastlog=$local.': '.$message; 3608: print $fh "$local ($$): $message\n"; 3609: } 3610: 3611: # ------------------------- Conditional log if $DEBUG true. 3612: sub Debug { 3613: my $message = shift; 3614: if($DEBUG) { 3615: &logthis($message); 3616: } 3617: } 3618: 3619: # 3620: # Sub to do replies to client.. this gives a hook for some 3621: # debug tracing too: 3622: # Parameters: 3623: # fd - File open on client. 3624: # reply - Text to send to client. 3625: # request - Original request from client. 3626: # 3627: # Note: This increments Transactions 3628: # 3629: sub Reply { 3630: alarm(120); 3631: my $fd = shift; 3632: my $reply = shift; 3633: my $request = shift; 3634: 3635: print $fd $reply; 3636: Debug("Request was $request Reply was $reply"); 3637: 3638: $Transactions++; 3639: alarm(0); 3640: 3641: 3642: } 3643: # 3644: # Sub to report a failure. 3645: # This function: 3646: # - Increments the failure statistic counters. 3647: # - Invokes Reply to send the error message to the client. 3648: # Parameters: 3649: # fd - File descriptor open on the client 3650: # reply - Reply text to emit. 3651: # request - The original request message (used by Reply 3652: # to debug if that's enabled. 3653: # Implicit outputs: 3654: # $Failures- The number of failures is incremented. 3655: # Reply (invoked here) sends a message to the 3656: # client: 3657: # 3658: sub Failure { 3659: my $fd = shift; 3660: my $reply = shift; 3661: my $request = shift; 3662: 3663: $Failures++; 3664: Reply($fd, $reply, $request); # That's simple eh? 3665: } 3666: # ------------------------------------------------------------------ Log status 3667: 3668: sub logstatus { 3669: &status("Doing logging"); 3670: my $docdir=$perlvar{'lonDocRoot'}; 3671: { 3672: my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt"); 3673: print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n"; 3674: $fh->close(); 3675: } 3676: &status("Finished londstatus.txt"); 3677: { 3678: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt"); 3679: print $fh $status."\n".$lastlog."\n".time; 3680: $fh->close(); 3681: } 3682: ResetStatistics; 3683: &status("Finished logging"); 3684: 3685: } 3686: 3687: sub initnewstatus { 3688: my $docdir=$perlvar{'lonDocRoot'}; 3689: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt"); 3690: my $now=time; 3691: my $local=localtime($now); 3692: print $fh "LOND status $local - parent $$\n\n"; 3693: opendir(DIR,"$docdir/lon-status/londchld"); 3694: while (my $filename=readdir(DIR)) { 3695: unlink("$docdir/lon-status/londchld/$filename"); 3696: } 3697: closedir(DIR); 3698: } 3699: 3700: # -------------------------------------------------------------- Status setting 3701: 3702: sub status { 3703: my $what=shift; 3704: my $now=time; 3705: my $local=localtime($now); 3706: my $status = "lond: $what $local "; 3707: if($Transactions) { 3708: $status .= " Transactions: $Transactions Failed; $Failures"; 3709: } 3710: $0=$status; 3711: } 3712: 3713: # -------------------------------------------------------- Escape Special Chars 3714: 3715: sub escape { 3716: my $str=shift; 3717: $str =~ s/(\W)/"%".unpack('H2',$1)/eg; 3718: return $str; 3719: } 3720: 3721: # ----------------------------------------------------- Un-Escape Special Chars 3722: 3723: sub unescape { 3724: my $str=shift; 3725: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; 3726: return $str; 3727: } 3728: 3729: # ----------------------------------------------------------- Send USR1 to lonc 3730: 3731: sub reconlonc { 3732: my $peerfile=shift; 3733: &logthis("Trying to reconnect for $peerfile"); 3734: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid"; 3735: if (my $fh=IO::File->new("$loncfile")) { 3736: my $loncpid=<$fh>; 3737: chomp($loncpid); 3738: if (kill 0 => $loncpid) { 3739: &logthis("lonc at pid $loncpid responding, sending USR1"); 3740: kill USR1 => $loncpid; 3741: } else { 3742: &logthis("CRITICAL: " 3743: ."lonc at pid $loncpid not responding, giving up"); 3744: } 3745: } else { 3746: &logthis('CRITICAL: lonc not running, giving up'); 3747: } 3748: } 3749: 3750: # -------------------------------------------------- Non-critical communication 3751: 3752: sub subreply { 3753: my ($cmd,$server)=@_; 3754: my $peerfile="$perlvar{'lonSockDir'}/$server"; 3755: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", 3756: Type => SOCK_STREAM, 3757: Timeout => 10) 3758: or return "con_lost"; 3759: print $sclient "$cmd\n"; 3760: my $answer=<$sclient>; 3761: chomp($answer); 3762: if (!$answer) { $answer="con_lost"; } 3763: return $answer; 3764: } 3765: 3766: sub reply { 3767: my ($cmd,$server)=@_; 3768: my $answer; 3769: if ($server ne $currenthostid) { 3770: $answer=subreply($cmd,$server); 3771: if ($answer eq 'con_lost') { 3772: $answer=subreply("ping",$server); 3773: if ($answer ne $server) { 3774: &logthis("sub reply: answer != server answer is $answer, server is $server"); 3775: &reconlonc("$perlvar{'lonSockDir'}/$server"); 3776: } 3777: $answer=subreply($cmd,$server); 3778: } 3779: } else { 3780: $answer='self_reply'; 3781: } 3782: return $answer; 3783: } 3784: 3785: # -------------------------------------------------------------- Talk to lonsql 3786: 3787: sub sqlreply { 3788: my ($cmd)=@_; 3789: my $answer=subsqlreply($cmd); 3790: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); } 3791: return $answer; 3792: } 3793: 3794: sub subsqlreply { 3795: my ($cmd)=@_; 3796: my $unixsock="mysqlsock"; 3797: my $peerfile="$perlvar{'lonSockDir'}/$unixsock"; 3798: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", 3799: Type => SOCK_STREAM, 3800: Timeout => 10) 3801: or return "con_lost"; 3802: print $sclient "$cmd\n"; 3803: my $answer=<$sclient>; 3804: chomp($answer); 3805: if (!$answer) { $answer="con_lost"; } 3806: return $answer; 3807: } 3808: 3809: # -------------------------------------------- Return path to profile directory 3810: 3811: sub propath { 3812: my ($udom,$uname)=@_; 3813: Debug("Propath:$udom:$uname"); 3814: $udom=~s/\W//g; 3815: $uname=~s/\W//g; 3816: Debug("Propath2:$udom:$uname"); 3817: my $subdir=$uname.'__'; 3818: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/; 3819: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname"; 3820: Debug("Propath returning $proname"); 3821: return $proname; 3822: } 3823: 3824: # --------------------------------------- Is this the home server of an author? 3825: 3826: sub ishome { 3827: my $author=shift; 3828: Debug("ishome: $author"); 3829: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/; 3830: Debug(" after big regsub: $author"); 3831: my ($udom,$uname)=split(/\//,$author); 3832: Debug(" domain: $udom user: $uname"); 3833: my $proname=propath($udom,$uname); 3834: Debug(" path = $proname"); 3835: if (-e $proname) { 3836: return 'owner'; 3837: } else { 3838: return 'not_owner'; 3839: } 3840: } 3841: 3842: # ======================================================= Continue main program 3843: # ---------------------------------------------------- Fork once and dissociate 3844: 3845: my $fpid=fork; 3846: exit if $fpid; 3847: die "Couldn't fork: $!" unless defined ($fpid); 3848: 3849: POSIX::setsid() or die "Can't start new session: $!"; 3850: 3851: # ------------------------------------------------------- Write our PID on disk 3852: 3853: my $execdir=$perlvar{'lonDaemons'}; 3854: open (PIDSAVE,">$execdir/logs/lond.pid"); 3855: print PIDSAVE "$$\n"; 3856: close(PIDSAVE); 3857: &logthis("CRITICAL: ---------- Starting ----------"); 3858: &status('Starting'); 3859: 3860: 3861: 3862: # ----------------------------------------------------- Install signal handlers 3863: 3864: 3865: $SIG{CHLD} = \&REAPER; 3866: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN; 3867: $SIG{HUP} = \&HUPSMAN; 3868: $SIG{USR1} = \&checkchildren; 3869: $SIG{USR2} = \&UpdateHosts; 3870: 3871: # Read the host hashes: 3872: 3873: ReadHostTable; 3874: 3875: 3876: # -------------------------------------------------------------- 3877: # Accept connections. When a connection comes in, it is validated 3878: # and if good, a child process is created to process transactions 3879: # along the connection. 3880: 3881: while (1) { 3882: &status('Starting accept'); 3883: $client = $server->accept() or next; 3884: &status('Accepted '.$client.' off to spawn'); 3885: make_new_child($client); 3886: &status('Finished spawning'); 3887: } 3888: 3889: sub make_new_child { 3890: my $pid; 3891: my $sigset; 3892: 3893: $client = shift; 3894: &status('Starting new child '.$client); 3895: &logthis(' Attempting to start child ('.$client. 3896: ")"); 3897: # block signal for fork 3898: $sigset = POSIX::SigSet->new(SIGINT); 3899: sigprocmask(SIG_BLOCK, $sigset) 3900: or die "Can't block SIGINT for fork: $!\n"; 3901: 3902: die "fork: $!" unless defined ($pid = fork); 3903: 3904: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of 3905: # connection liveness. 3906: 3907: # 3908: # Figure out who we're talking to so we can record the peer in 3909: # the pid hash. 3910: # 3911: my $caller = getpeername($client); 3912: my ($port,$iaddr)=unpack_sockaddr_in($caller); 3913: $clientip=inet_ntoa($iaddr); 3914: 3915: if ($pid) { 3916: # Parent records the child's birth and returns. 3917: sigprocmask(SIG_UNBLOCK, $sigset) 3918: or die "Can't unblock SIGINT for fork: $!\n"; 3919: $children{$pid} = $clientip; 3920: $children++; 3921: &status('Started child '.$pid); 3922: return; 3923: } else { 3924: # Child can *not* return from this subroutine. 3925: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before 3926: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 3927: #don't get intercepted 3928: $SIG{USR1}= \&logstatus; 3929: $SIG{ALRM}= \&timeout; 3930: $lastlog='Forked '; 3931: $status='Forked'; 3932: 3933: # unblock signals 3934: sigprocmask(SIG_UNBLOCK, $sigset) 3935: or die "Can't unblock SIGINT for fork: $!\n"; 3936: 3937: 3938: 3939: &Authen::Krb5::init_context(); 3940: &Authen::Krb5::init_ets(); 3941: 3942: &status('Accepted connection'); 3943: # ============================================================================= 3944: # do something with the connection 3945: # ----------------------------------------------------------------------------- 3946: # see if we know client and check for spoof IP by challenge 3947: 3948: ReadManagerTable; # May also be a manager!! 3949: 3950: my $clientrec=($hostid{$clientip} ne undef); 3951: my $ismanager=($managers{$clientip} ne undef); 3952: $clientname = "[unknonwn]"; 3953: if($clientrec) { # Establish client type. 3954: $ConnectionType = "client"; 3955: $clientname = $hostid{$clientip}; 3956: if($ismanager) { 3957: $ConnectionType = "both"; 3958: } 3959: } else { 3960: $ConnectionType = "manager"; 3961: $clientname = $managers{$clientip}; 3962: } 3963: my $clientok; 3964: if ($clientrec || $ismanager) { 3965: &status("Waiting for init from $clientip $clientname"); 3966: &logthis('INFO: Connection, '. 3967: $clientip. 3968: " ($clientname) connection type = $ConnectionType " ); 3969: &status("Connecting $clientip ($clientname))"); 3970: my $remotereq=<$client>; 3971: $remotereq=~s/[^\w:]//g; 3972: if ($remotereq =~ /^init/) { 3973: &sethost("sethost:$perlvar{'lonHostID'}"); 3974: my $challenge="$$".time; 3975: print $client "$challenge\n"; 3976: &status("Waiting for challenge reply from $clientip ($clientname)"); 3977: $remotereq=<$client>; 3978: $remotereq=~s/\W//g; 3979: if ($challenge eq $remotereq) { 3980: $clientok=1; 3981: print $client "ok\n"; 3982: } else { 3983: &logthis("WARNING: $clientip did not reply challenge"); 3984: &status('No challenge reply '.$clientip); 3985: } 3986: } else { 3987: &logthis("WARNING: " 3988: ."$clientip failed to initialize: >$remotereq< "); 3989: &status('No init '.$clientip); 3990: } 3991: } else { 3992: &logthis("WARNING: Unknown client $clientip"); 3993: &status('Hung up on '.$clientip); 3994: } 3995: if ($clientok) { 3996: # ---------------- New known client connecting, could mean machine online again 3997: 3998: foreach my $id (keys(%hostip)) { 3999: if ($hostip{$id} ne $clientip || 4000: $hostip{$currenthostid} eq $clientip) { 4001: # no need to try to do recon's to myself 4002: next; 4003: } 4004: &reconlonc("$perlvar{'lonSockDir'}/$id"); 4005: } 4006: &logthis("Established connection: $clientname"); 4007: &status('Will listen to '.$clientname); 4008: 4009: ResetStatistics(); 4010: 4011: # ------------------------------------------------------------ Process requests 4012: my $KeepGoing = 1; 4013: while ((my $userinput=GetRequest) && $KeepGoing) { 4014: $KeepGoing = ProcessRequest($userinput); 4015: # -------------------------------------------------------------------- complete 4016: 4017: &status('Listening to '.$clientname); 4018: } 4019: # --------------------------------------------- client unknown or fishy, refuse 4020: } else { 4021: print $client "refused\n"; 4022: $client->close(); 4023: &logthis("WARNING: " 4024: ."Rejected client $clientip, closing connection"); 4025: } 4026: } 4027: 4028: # ============================================================================= 4029: 4030: &logthis("CRITICAL: " 4031: ."Disconnect from $clientip ($clientname)"); 4032: 4033: 4034: # this exit is VERY important, otherwise the child will become 4035: # a producer of more and more children, forking yourself into 4036: # process death. 4037: exit; 4038: 4039: } 4040: 4041: 4042: # 4043: # Checks to see if the input roleput request was to set 4044: # an author role. If so, invokes the lchtmldir script to set 4045: # up a correct public_html 4046: # Parameters: 4047: # request - The request sent to the rolesput subchunk. 4048: # We're looking for /domain/_au 4049: # domain - The domain in which the user is having roles doctored. 4050: # user - Name of the user for which the role is being put. 4051: # authtype - The authentication type associated with the user. 4052: # 4053: sub ManagePermissions { 4054: my $request = shift; 4055: my $domain = shift; 4056: my $user = shift; 4057: my $authtype= shift; 4058: 4059: # See if the request is of the form /$domain/_au 4060: &logthis("request is $request"); 4061: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput... 4062: my $execdir = $perlvar{'lonDaemons'}; 4063: my $userhome= "/home/$user" ; 4064: &logthis("system $execdir/lchtmldir $userhome $user $authtype"); 4065: system("$execdir/lchtmldir $userhome $user $authtype"); 4066: } 4067: } 4068: 4069: # 4070: # Return the full path of a user password file, whether it exists or not. 4071: # Parameters: 4072: # domain - Domain in which the password file lives. 4073: # user - name of the user. 4074: # Returns: 4075: # Full passwd path: 4076: # 4077: sub PasswordPath { 4078: my $domain = shift; 4079: my $user = shift; 4080: 4081: my $path = &propath($domain, $user); 4082: $path .= "/passwd"; 4083: 4084: return $path; 4085: } 4086: 4087: # Password Filename 4088: # Returns the path to a passwd file given domain and user... only if 4089: # it exists. 4090: # Parameters: 4091: # domain - Domain in which to search. 4092: # user - username. 4093: # Returns: 4094: # - If the password file exists returns its path. 4095: # - If the password file does not exist, returns undefined. 4096: # 4097: sub PasswordFilename { 4098: my $domain = shift; 4099: my $user = shift; 4100: 4101: Debug ("PasswordFilename called: dom = $domain user = $user"); 4102: 4103: my $path = PasswordPath($domain, $user); 4104: Debug("PasswordFilename got path: $path"); 4105: if(-e $path) { 4106: return $path; 4107: } else { 4108: return undef; 4109: } 4110: } 4111: 4112: # 4113: # Rewrite the contents of the user's passwd file. 4114: # Parameters: 4115: # domain - domain of the user. 4116: # name - User's name. 4117: # contents - New contents of the file. 4118: # Returns: 4119: # 0 - Failed. 4120: # 1 - Success. 4121: # 4122: sub RewritePwFile { 4123: my $domain = shift; 4124: my $user = shift; 4125: my $contents = shift; 4126: 4127: my $file = PasswordFilename($domain, $user); 4128: if (defined $file) { 4129: my $pf = IO::File->new(">$file"); 4130: if($pf) { 4131: print $pf "$contents\n"; 4132: return 1; 4133: } else { 4134: return 0; 4135: } 4136: } else { 4137: return 0; 4138: } 4139: 4140: } 4141: # 4142: # GetAuthType - Determines the authorization type of a user in a domain. 4143: 4144: # Returns the authorization type or nouser if there is no such user. 4145: # 4146: sub GetAuthType { 4147: my $domain = shift; 4148: my $user = shift; 4149: 4150: Debug("GetAuthType( $domain, $user ) \n"); 4151: my $passwdfile = PasswordFilename($domain, $user); 4152: if( defined $passwdfile ) { 4153: my $pf = IO::File->new($passwdfile); 4154: my $realpassword = <$pf>; 4155: chomp($realpassword); 4156: Debug("Password info = $realpassword\n"); 4157: return $realpassword; 4158: } else { 4159: Debug("Returning nouser"); 4160: return "nouser"; 4161: } 4162: } 4163: 4164: # 4165: # Validate a user given their domain, name and password. This utility 4166: # function is used by both AuthenticateHandler and ChangePasswordHandler 4167: # to validate the login credentials of a user. 4168: # Parameters: 4169: # $domain - The domain being logged into (this is required due to 4170: # the capability for multihomed systems. 4171: # $user - The name of the user being validated. 4172: # $password - The user's propoposed password. 4173: # 4174: # Returns: 4175: # 1 - The domain,user,pasword triplet corresponds to a valid 4176: # user. 4177: # 0 - The domain,user,password triplet is not a valid user. 4178: # 4179: sub ValidateUser { 4180: my $domain = shift; 4181: my $user = shift; 4182: my $password= shift; 4183: 4184: # Why negative ~pi you may well ask? Well this function is about 4185: # authentication, and therefore very important to get right. 4186: # I've initialized the flag that determines whether or not I've 4187: # validated correctly to a value it's not supposed to get. 4188: # At the end of this function. I'll ensure that it's not still that 4189: # value so we don't just wind up returning some accidental value 4190: # as a result of executing an unforseen code path that 4191: # did not set $validated. 4192: 4193: my $validated = -3.14159; 4194: 4195: # How we authenticate is determined by the type of authentication 4196: # the user has been assigned. If the authentication type is 4197: # "nouser", the user does not exist so we will return 0. 4198: 4199: my $contents = GetAuthType($domain, $user); 4200: my ($howpwd, $contentpwd) = split(/:/, $contents); 4201: 4202: my $null = pack("C",0); # Used by kerberos auth types. 4203: 4204: if ($howpwd ne 'nouser') { 4205: 4206: if($howpwd eq "internal") { # Encrypted is in local password file. 4207: $validated = (crypt($password, $contentpwd) eq $contentpwd); 4208: } 4209: elsif ($howpwd eq "unix") { # User is a normal unix user. 4210: $contentpwd = (getpwnam($user))[1]; 4211: if($contentpwd) { 4212: if($contentpwd eq 'x') { # Shadow password file... 4213: my $pwauth_path = "/usr/local/sbin/pwauth"; 4214: open PWAUTH, "|$pwauth_path" or 4215: die "Cannot invoke authentication"; 4216: print PWAUTH "$user\n$password\n"; 4217: close PWAUTH; 4218: $validated = ! $?; 4219: 4220: } else { # Passwords in /etc/passwd. 4221: $validated = (crypt($password, 4222: $contentpwd) eq $contentpwd); 4223: } 4224: } else { 4225: $validated = 0; 4226: } 4227: } 4228: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain. 4229: if(! ($password =~ /$null/) ) { 4230: my $k4error = &Authen::Krb4::get_pw_in_tkt($user, 4231: "", 4232: $contentpwd,, 4233: 'krbtgt', 4234: $contentpwd, 4235: 1, 4236: $password); 4237: if(!$k4error) { 4238: $validated = 1; 4239: } 4240: else { 4241: $validated = 0; 4242: &logthis('krb4: '.$user.', '.$contentpwd.', '. 4243: &Authen::Krb4::get_err_txt($Authen::Krb4::error)); 4244: } 4245: } 4246: else { 4247: $validated = 0; # Password has a match with null. 4248: } 4249: } 4250: elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain. 4251: if(!($password =~ /$null/)) { # Null password not allowed. 4252: my $krbclient = &Authen::Krb5::parse_name($user.'@' 4253: .$contentpwd); 4254: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd; 4255: my $krbserver = &Authen::Krb5::parse_name($krbservice); 4256: my $credentials= &Authen::Krb5::cc_default(); 4257: $credentials->initialize($krbclient); 4258: my $krbreturn = &Authen::KRb5::get_in_tkt_with_password($krbclient, 4259: $krbserver, 4260: $password, 4261: $credentials); 4262: $validated = ($krbreturn == 1); 4263: } 4264: else { 4265: $validated = 0; 4266: } 4267: } 4268: elsif ($howpwd eq "localauth") { 4269: # Authenticate via installation specific authentcation method: 4270: $validated = &localauth::localauth($user, 4271: $password, 4272: $contentpwd); 4273: } 4274: else { # Unrecognized auth is also bad. 4275: $validated = 0; 4276: } 4277: } else { 4278: $validated = 0; 4279: } 4280: # 4281: # $validated has the correct stat of the authentication: 4282: # 4283: 4284: unless ($validated != -3.14159) { 4285: die "ValidateUser - failed to set the value of validated"; 4286: } 4287: return $validated; 4288: } 4289: 4290: # 4291: # Add a line to the subscription list? 4292: # 4293: sub addline { 4294: my ($fname,$hostid,$ip,$newline)=@_; 4295: my $contents; 4296: my $found=0; 4297: my $expr='^'.$hostid.':'.$ip.':'; 4298: $expr =~ s/\./\\\./g; 4299: my $sh; 4300: Debug("Looking for $expr"); 4301: if ($sh=IO::File->new("$fname.subscription")) { 4302: while (my $subline=<$sh>) { 4303: Debug("addline: line: $subline"); 4304: if ($subline !~ /$expr/) { 4305: $contents.= $subline; 4306: } else { 4307: Debug("Found $subline"); 4308: $found=1; 4309: } 4310: } 4311: $sh->close(); 4312: } 4313: $sh=IO::File->new(">$fname.subscription"); 4314: if ($contents) { print $sh $contents; } 4315: if ($newline) { 4316: Debug("Appending $newline"); 4317: print $sh $newline; 4318: } 4319: $sh->close(); 4320: return $found; 4321: } 4322: # 4323: # Get chat messages. 4324: # 4325: sub getchat { 4326: my ($cdom,$cname,$udom,$uname)=@_; 4327: my %hash; 4328: my $proname=&propath($cdom,$cname); 4329: my @entries=(); 4330: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db", 4331: &GDBM_READER(),0640)) { 4332: @entries=map { $_.':'.$hash{$_} } sort keys %hash; 4333: untie %hash; 4334: } 4335: my @participants=(); 4336: my $cutoff=time-60; 4337: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db", 4338: &GDBM_WRCREAT(),0640)) { 4339: $hash{$uname.':'.$udom}=time; 4340: foreach (sort keys %hash) { 4341: if ($hash{$_}>$cutoff) { 4342: $participants[$#participants+1]='active_participant:'.$_; 4343: } 4344: } 4345: untie %hash; 4346: } 4347: return (@participants,@entries); 4348: } 4349: # 4350: # Add a chat message 4351: # 4352: sub chatadd { 4353: my ($cdom,$cname,$newchat)=@_; 4354: my %hash; 4355: my $proname=&propath($cdom,$cname); 4356: my @entries=(); 4357: my $time=time; 4358: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db", 4359: &GDBM_WRCREAT(),0640)) { 4360: @entries=map { $_.':'.$hash{$_} } sort keys %hash; 4361: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/); 4362: my ($thentime,$idnum)=split(/\_/,$lastid); 4363: my $newid=$time.'_000000'; 4364: if ($thentime==$time) { 4365: $idnum=~s/^0+//; 4366: $idnum++; 4367: $idnum=substr('000000'.$idnum,-6,6); 4368: $newid=$time.'_'.$idnum; 4369: } 4370: $hash{$newid}=$newchat; 4371: my $expired=$time-3600; 4372: foreach (keys %hash) { 4373: my ($thistime)=($_=~/(\d+)\_/); 4374: if ($thistime<$expired) { 4375: delete $hash{$_}; 4376: } 4377: } 4378: untie %hash; 4379: } 4380: { 4381: my $hfh; 4382: if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 4383: print $hfh "$time:".&unescape($newchat)."\n"; 4384: } 4385: } 4386: } 4387: 4388: sub unsub { 4389: my ($fname,$clientip)=@_; 4390: my $result; 4391: my $unsubs = 0; # Number of successful unsubscribes: 4392: 4393: 4394: # An old way subscriptions were handled was to have a 4395: # subscription marker file: 4396: 4397: Debug("Attempting unlink of $fname.$clientname"); 4398: if (unlink("$fname.$clientname")) { 4399: $unsubs++; # Successful unsub via marker file. 4400: } 4401: 4402: # The more modern way to do it is to have a subscription list 4403: # file: 4404: 4405: if (-e "$fname.subscription") { 4406: my $found=&addline($fname,$clientname,$clientip,''); 4407: if ($found) { 4408: $unsubs++; 4409: } 4410: } 4411: 4412: # If either or both of these mechanisms succeeded in unsubscribing a 4413: # resource we can return ok: 4414: 4415: if($unsubs) { 4416: $result = "ok\n"; 4417: } else { 4418: $result = "not_subscribed\n"; 4419: } 4420: 4421: return $result; 4422: } 4423: 4424: sub currentversion { 4425: my $fname=shift; 4426: my $version=-1; 4427: my $ulsdir=''; 4428: if ($fname=~/^(.+)\/[^\/]+$/) { 4429: $ulsdir=$1; 4430: } 4431: my ($fnamere1,$fnamere2); 4432: # remove version if already specified 4433: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/; 4434: # get the bits that go before and after the version number 4435: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) { 4436: $fnamere1=$1; 4437: $fnamere2='.'.$2; 4438: } 4439: if (-e $fname) { $version=1; } 4440: if (-e $ulsdir) { 4441: if(-d $ulsdir) { 4442: if (opendir(LSDIR,$ulsdir)) { 4443: my $ulsfn; 4444: while ($ulsfn=readdir(LSDIR)) { 4445: # see if this is a regular file (ignore links produced earlier) 4446: my $thisfile=$ulsdir.'/'.$ulsfn; 4447: unless (-l $thisfile) { 4448: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) { 4449: if ($1>$version) { $version=$1; } 4450: } 4451: } 4452: } 4453: closedir(LSDIR); 4454: $version++; 4455: } 4456: } 4457: } 4458: return $version; 4459: } 4460: 4461: sub thisversion { 4462: my $fname=shift; 4463: my $version=-1; 4464: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) { 4465: $version=$1; 4466: } 4467: return $version; 4468: } 4469: 4470: sub subscribe { 4471: my ($userinput,$clientip)=@_; 4472: chomp($userinput); 4473: my $result; 4474: my ($cmd,$fname)=split(/:/,$userinput); 4475: my $ownership=&ishome($fname); 4476: Debug("subscribe: Owner = $ownership file: '$fname'"); 4477: if ($ownership eq 'owner') { 4478: # explitly asking for the current version? 4479: unless (-e $fname) { 4480: Debug("subscribe - does not exist"); 4481: my $currentversion=&currentversion($fname); 4482: if (&thisversion($fname)==$currentversion) { 4483: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) { 4484: my $root=$1; 4485: my $extension=$2; 4486: symlink($root.'.'.$extension, 4487: $root.'.'.$currentversion.'.'.$extension); 4488: unless ($extension=~/\.meta$/) { 4489: symlink($root.'.'.$extension.'.meta', 4490: $root.'.'.$currentversion.'.'.$extension.'.meta'); 4491: } 4492: } 4493: } 4494: } 4495: if (-e $fname) { 4496: Debug("subscribe - exists"); 4497: if (-d $fname) { 4498: $result="directory\n"; 4499: } else { 4500: if (-e "$fname.$clientname") {&unsub($fname,$clientip);} 4501: my $now=time; 4502: my $found=&addline($fname,$clientname,$clientip, 4503: "$clientname:$clientip:$now\n"); 4504: if ($found) { $result="$fname\n"; } 4505: # if they were subscribed to only meta data, delete that 4506: # subscription, when you subscribe to a file you also get 4507: # the metadata 4508: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); } 4509: $fname=~s/\/home\/httpd\/html\/res/raw/; 4510: $fname="http://$thisserver/".$fname; 4511: $result="$fname\n"; 4512: } 4513: } else { 4514: $result="not_found\n"; 4515: } 4516: } else { 4517: $result="rejected\n"; 4518: } 4519: return $result; 4520: } 4521: 4522: sub make_passwd_file { 4523: my ($uname, $umode,$npass,$passfilename)=@_; 4524: my $result="ok\n"; 4525: if ($umode eq 'krb4' or $umode eq 'krb5') { 4526: { 4527: my $pf = IO::File->new(">$passfilename"); 4528: print $pf "$umode:$npass\n"; 4529: } 4530: } elsif ($umode eq 'internal') { 4531: my $salt=time; 4532: $salt=substr($salt,6,2); 4533: my $ncpass=crypt($npass,$salt); 4534: { 4535: &Debug("Creating internal auth"); 4536: my $pf = IO::File->new(">$passfilename"); 4537: print $pf "internal:$ncpass\n"; 4538: } 4539: } elsif ($umode eq 'localauth') { 4540: { 4541: my $pf = IO::File->new(">$passfilename"); 4542: print $pf "localauth:$npass\n"; 4543: } 4544: } elsif ($umode eq 'unix') { 4545: # 4546: # Don't allow the creation of privileged accounts!!! that would 4547: # be real bad!!! 4548: # 4549: my $uid = getpwnam($uname); 4550: if((defined $uid) && ($uid == 0)) { 4551: &logthis(">>>Attempted add of privileged account blocked<<<"); 4552: return "no_priv_account_error\n"; 4553: } 4554: 4555: # 4556: my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd"; 4557: 4558: &Debug("Executing external: ".$execpath); 4559: &Debug("user = ".$uname.", Password =". $npass); 4560: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log"); 4561: print $se "$uname\n"; 4562: print $se "$npass\n"; 4563: print $se "$npass\n"; 4564: 4565: my $useraddok = $?; 4566: if($useraddok > 0) { 4567: my $lcstring = lcuseraddstrerror($useraddok); 4568: &logthis("Failed lcuseradd: $lcstring"); 4569: return "error: lcuseradd failed: $lcstring\n"; 4570: } 4571: my $pf = IO::File->new(">$passfilename"); 4572: print $pf "unix:\n"; 4573: 4574: } elsif ($umode eq 'none') { 4575: { 4576: my $pf = IO::File->new(">$passfilename"); 4577: print $pf "none:\n"; 4578: } 4579: } else { 4580: $result="auth_mode_error\n"; 4581: } 4582: return $result; 4583: } 4584: 4585: sub sethost { 4586: my ($remotereq) = @_; 4587: Debug("sethost got $remotereq"); 4588: my (undef,$hostid)=split(/:/,$remotereq); 4589: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; } 4590: Debug("sethost attempting to set host $hostid"); 4591: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) { 4592: $currenthostid=$hostid; 4593: $currentdomainid=$hostdom{$hostid}; 4594: &logthis("Setting hostid to $hostid, and domain to $currentdomainid"); 4595: } else { 4596: &logthis("Requested host id $hostid not an alias of ". 4597: $perlvar{'lonHostID'}." refusing connection"); 4598: return 'unable_to_set'; 4599: } 4600: return 'ok'; 4601: } 4602: 4603: sub version { 4604: my ($userinput)=@_; 4605: $remoteVERSION=(split(/:/,$userinput))[1]; 4606: return "version:$VERSION"; 4607: } 4608: ############## >>>>>>>>>>>>>>>>>>>>>>>>>> FUTUREWORK <<<<<<<<<<<<<<<<<<<<<<<<<<<< 4609: #There is a copy of this in lonnet.pm 4610: # Can we hoist these lil' things out into common places? 4611: # 4612: sub userload { 4613: my $numusers=0; 4614: { 4615: opendir(LONIDS,$perlvar{'lonIDsDir'}); 4616: my $filename; 4617: my $curtime=time; 4618: while ($filename=readdir(LONIDS)) { 4619: if ($filename eq '.' || $filename eq '..') {next;} 4620: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9]; 4621: if ($curtime-$mtime < 1800) { $numusers++; } 4622: } 4623: closedir(LONIDS); 4624: } 4625: my $userloadpercent=0; 4626: my $maxuserload=$perlvar{'lonUserLoadLim'}; 4627: if ($maxuserload) { 4628: $userloadpercent=100*$numusers/$maxuserload; 4629: } 4630: $userloadpercent=sprintf("%.2f",$userloadpercent); 4631: return $userloadpercent; 4632: } 4633: 4634: # ----------------------------------- POD (plain old documentation, CPAN style) 4635: 4636: =head1 NAME 4637: 4638: lond - "LON Daemon" Server (port "LOND" 5663) 4639: 4640: =head1 SYNOPSIS 4641: 4642: Usage: B<lond> 4643: 4644: Should only be run as user=www. This is a command-line script which 4645: is invoked by B<loncron>. There is no expectation that a typical user 4646: will manually start B<lond> from the command-line. (In other words, 4647: DO NOT START B<lond> YOURSELF.) 4648: 4649: =head1 DESCRIPTION 4650: 4651: There are two characteristics associated with the running of B<lond>, 4652: PROCESS MANAGEMENT (starting, stopping, handling child processes) 4653: and SERVER-SIDE ACTIVITIES (password authentication, user creation, 4654: subscriptions, etc). These are described in two large 4655: sections below. 4656: 4657: B<PROCESS MANAGEMENT> 4658: 4659: Preforker - server who forks first. Runs as a daemon. HUPs. 4660: Uses IDEA encryption 4661: 4662: B<lond> forks off children processes that correspond to the other servers 4663: in the network. Management of these processes can be done at the 4664: parent process level or the child process level. 4665: 4666: B<logs/lond.log> is the location of log messages. 4667: 4668: The process management is now explained in terms of linux shell commands, 4669: subroutines internal to this code, and signal assignments: 4670: 4671: =over 4 4672: 4673: =item * 4674: 4675: PID is stored in B<logs/lond.pid> 4676: 4677: This is the process id number of the parent B<lond> process. 4678: 4679: =item * 4680: 4681: SIGTERM and SIGINT 4682: 4683: Parent signal assignment: 4684: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN; 4685: 4686: Child signal assignment: 4687: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also) 4688: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber 4689: to restart a new child.) 4690: 4691: Command-line invocations: 4692: B<kill> B<-s> SIGTERM I<PID> 4693: B<kill> B<-s> SIGINT I<PID> 4694: 4695: Subroutine B<HUNTSMAN>: 4696: This is only invoked for the B<lond> parent I<PID>. 4697: This kills all the children, and then the parent. 4698: The B<lonc.pid> file is cleared. 4699: 4700: =item * 4701: 4702: SIGHUP 4703: 4704: Current bug: 4705: This signal can only be processed the first time 4706: on the parent process. Subsequent SIGHUP signals 4707: have no effect. 4708: 4709: Parent signal assignment: 4710: $SIG{HUP} = \&HUPSMAN; 4711: 4712: Child signal assignment: 4713: none (nothing happens) 4714: 4715: Command-line invocations: 4716: B<kill> B<-s> SIGHUP I<PID> 4717: 4718: Subroutine B<HUPSMAN>: 4719: This is only invoked for the B<lond> parent I<PID>, 4720: This kills all the children, and then the parent. 4721: The B<lond.pid> file is cleared. 4722: 4723: =item * 4724: 4725: SIGUSR1 4726: 4727: Parent signal assignment: 4728: $SIG{USR1} = \&USRMAN; 4729: 4730: Child signal assignment: 4731: $SIG{USR1}= \&logstatus; 4732: 4733: Command-line invocations: 4734: B<kill> B<-s> SIGUSR1 I<PID> 4735: 4736: Subroutine B<USRMAN>: 4737: When invoked for the B<lond> parent I<PID>, 4738: SIGUSR1 is sent to all the children, and the status of 4739: each connection is logged. 4740: 4741: =item * 4742: 4743: SIGUSR2 4744: 4745: Parent Signal assignment: 4746: $SIG{USR2} = \&UpdateHosts 4747: 4748: Child signal assignment: 4749: NONE 4750: 4751: 4752: =item * 4753: 4754: SIGCHLD 4755: 4756: Parent signal assignment: 4757: $SIG{CHLD} = \&REAPER; 4758: 4759: Child signal assignment: 4760: none 4761: 4762: Command-line invocations: 4763: B<kill> B<-s> SIGCHLD I<PID> 4764: 4765: Subroutine B<REAPER>: 4766: This is only invoked for the B<lond> parent I<PID>. 4767: Information pertaining to the child is removed. 4768: The socket port is cleaned up. 4769: 4770: =back 4771: 4772: B<SERVER-SIDE ACTIVITIES> 4773: 4774: Server-side information can be accepted in an encrypted or non-encrypted 4775: method. 4776: 4777: =over 4 4778: 4779: =item ping 4780: 4781: Query a client in the hosts.tab table; "Are you there?" 4782: 4783: =item pong 4784: 4785: Respond to a ping query. 4786: 4787: =item ekey 4788: 4789: Read in encrypted key, make cipher. Respond with a buildkey. 4790: 4791: =item load 4792: 4793: Respond with CPU load based on a computation upon /proc/loadavg. 4794: 4795: =item currentauth 4796: 4797: Reply with current authentication information (only over an 4798: encrypted channel). 4799: 4800: =item auth 4801: 4802: Only over an encrypted channel, reply as to whether a user's 4803: authentication information can be validated. 4804: 4805: =item passwd 4806: 4807: Allow for a password to be set. 4808: 4809: =item makeuser 4810: 4811: Make a user. 4812: 4813: =item passwd 4814: 4815: Allow for authentication mechanism and password to be changed. 4816: 4817: =item home 4818: 4819: Respond to a question "are you the home for a given user?" 4820: 4821: =item update 4822: 4823: Update contents of a subscribed resource. 4824: 4825: =item unsubscribe 4826: 4827: The server is unsubscribing from a resource. 4828: 4829: =item subscribe 4830: 4831: The server is subscribing to a resource. 4832: 4833: =item log 4834: 4835: Place in B<logs/lond.log> 4836: 4837: =item put 4838: 4839: stores hash in namespace 4840: 4841: =item rolesput 4842: 4843: put a role into a user's environment 4844: 4845: =item get 4846: 4847: returns hash with keys from array 4848: reference filled in from namespace 4849: 4850: =item eget 4851: 4852: returns hash with keys from array 4853: reference filled in from namesp (encrypts the return communication) 4854: 4855: =item rolesget 4856: 4857: get a role from a user's environment 4858: 4859: =item del 4860: 4861: deletes keys out of array from namespace 4862: 4863: =item keys 4864: 4865: returns namespace keys 4866: 4867: =item dump 4868: 4869: dumps the complete (or key matching regexp) namespace into a hash 4870: 4871: =item store 4872: 4873: stores hash permanently 4874: for this url; hashref needs to be given and should be a \%hashname; the 4875: remaining args aren't required and if they aren't passed or are '' they will 4876: be derived from the ENV 4877: 4878: =item restore 4879: 4880: returns a hash for a given url 4881: 4882: =item querysend 4883: 4884: Tells client about the lonsql process that has been launched in response 4885: to a sent query. 4886: 4887: =item queryreply 4888: 4889: Accept information from lonsql and make appropriate storage in temporary 4890: file space. 4891: 4892: =item idput 4893: 4894: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers 4895: for each student, defined perhaps by the institutional Registrar.) 4896: 4897: =item idget 4898: 4899: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers 4900: for each student, defined perhaps by the institutional Registrar.) 4901: 4902: =item tmpput 4903: 4904: Accept and store information in temporary space. 4905: 4906: =item tmpget 4907: 4908: Send along temporarily stored information. 4909: 4910: =item ls 4911: 4912: List part of a user's directory. 4913: 4914: =item pushtable 4915: 4916: Pushes a file in /home/httpd/lonTab directory. Currently limited to: 4917: hosts.tab and domain.tab. The old file is copied to *.tab.backup but 4918: must be restored manually in case of a problem with the new table file. 4919: pushtable requires that the request be encrypted and validated via 4920: ValidateManager. The form of the command is: 4921: enc:pushtable tablename <tablecontents> \n 4922: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 4923: cleartext newline. 4924: 4925: =item Hanging up (exit or init) 4926: 4927: What to do when a client tells the server that they (the client) 4928: are leaving the network. 4929: 4930: =item unknown command 4931: 4932: If B<lond> is sent an unknown command (not in the list above), 4933: it replys to the client "unknown_cmd". 4934: 4935: 4936: =item UNKNOWN CLIENT 4937: 4938: If the anti-spoofing algorithm cannot verify the client, 4939: the client is rejected (with a "refused" message sent 4940: to the client, and the connection is closed. 4941: 4942: =back 4943: 4944: =head1 PREREQUISITES 4945: 4946: IO::Socket 4947: IO::File 4948: Apache::File 4949: Symbol 4950: POSIX 4951: Crypt::IDEA 4952: LWP::UserAgent() 4953: GDBM_File 4954: Authen::Krb4 4955: Authen::Krb5 4956: 4957: =head1 COREQUISITES 4958: 4959: =head1 OSNAMES 4960: 4961: linux 4962: 4963: =head1 SCRIPT CATEGORIES 4964: 4965: Server/Process 4966: 4967: =cut