loncom/lond - view - 1.178.2.16

File: [LON-CAPA] / loncom / lond
Revision 1.178.2.16: download - view: text, annotated - select for diffs
Thu Apr 15 11:26:34 2004 UTC (20 years ago) by foxr
Branches: Refactoring

- Fix mis-spelling of GetProfileEntryEncrpyted.
- Fix error - if lcuseradd failed, the make user function returned ok
  anyway... very mis-leading.

1: #!/usr/bin/perl 2: # The LearningOnline Network 3: # lond "LON Daemon" Server (port "LOND" 5663) 4: # 5: # $Id: lond,v 1.178.2.16 2004/04/15 11:26:34 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: 1.178.2.16 $'; #' 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=$tail; 1032: my $ownership=ishome($fname); 1033: if ($ownership eq 'not_owner') { 1034: if (-e $fname) { 1035: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size, 1036: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname); 1037: my $now=time; 1038: my $since=$now-$atime; 1039: if ($since>$perlvar{'lonExpire'}) { 1040: my $reply=&reply("unsub:$fname","$clientname"); 1041: unlink("$fname"); 1042: } else { 1043: my $transname="$fname.in.transfer"; 1044: my $remoteurl=&reply("sub:$fname","$clientname"); 1045: my $response; 1046: alarm(120); 1047: { 1048: my $ua=new LWP::UserAgent; 1049: my $request=new HTTP::Request('GET',"$remoteurl"); 1050: $response=$ua->request($request,$transname); 1051: } 1052: alarm(0); 1053: if ($response->is_error()) { 1054: unlink($transname); 1055: my $message=$response->status_line; 1056: &logthis("LWP GET: $message for $fname ($remoteurl)"); 1057: } else { 1058: if ($remoteurl!~/\.meta$/) { 1059: alarm(120); 1060: { 1061: my $ua=new LWP::UserAgent; 1062: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta'); 1063: my $mresponse=$ua->request($mrequest,$fname.'.meta'); 1064: if ($mresponse->is_error()) { 1065: unlink($fname.'.meta'); 1066: } 1067: } 1068: alarm(0); 1069: } 1070: rename($transname,$fname); 1071: } 1072: } 1073: Reply( $client, "ok\n", $userinput); 1074: } else { 1075: Failure($client, "not_found\n", $userinput); 1076: } 1077: } else { 1078: Failure($client, "rejected\n", $userinput); 1079: } 1080: return 1; 1081: } 1082: RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0); 1083: 1084: # 1085: # Fetch a user file from a remote server: 1086: # Parameters: 1087: # $cmd - The command that got us here. 1088: # $tail - Tail of the command (remaining parameters). 1089: # $client - File descriptor connected to client. 1090: # Returns 1091: # 0 - Requested to exit, caller should shut down. 1092: # 1 - Continue processing. 1093: # 1094: sub FetchUserFileHandler { 1095: my $cmd = shift; 1096: my $tail = shift; 1097: my $client = shift; 1098: 1099: my $userinput = "$cmd:$tail"; 1100: my $fname = $tail; 1101: my ($udom,$uname,$ufile)=split(/\//,$fname); 1102: my $udir=propath($udom,$uname).'/userfiles'; 1103: unless (-e $udir) { 1104: mkdir($udir,0770); 1105: } 1106: if (-e $udir) { 1107: $ufile=~s/^[\.\~]+//; 1108: $ufile=~s/\///g; 1109: my $destname=$udir.'/'.$ufile; 1110: my $transname=$udir.'/'.$ufile.'.in.transit'; 1111: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname; 1112: my $response; 1113: alarm(120); 1114: { 1115: my $ua=new LWP::UserAgent; 1116: my $request=new HTTP::Request('GET',"$remoteurl"); 1117: $response=$ua->request($request,$transname); 1118: } 1119: alarm(0); 1120: if ($response->is_error()) { 1121: unlink($transname); 1122: my $message=$response->status_line; 1123: &logthis("LWP GET: $message for $fname ($remoteurl)"); 1124: Failure($client, "failed\n", $userinput); 1125: } else { 1126: if (!rename($transname,$destname)) { 1127: &logthis("Unable to move $transname to $destname"); 1128: unlink($transname); 1129: Failure($client, "failed\n", $userinput); 1130: } else { 1131: Reply($client, "ok\n", $userinput); 1132: } 1133: } 1134: } else { 1135: Failure($client, "not_home\n", $userinput); 1136: } 1137: return 1; 1138: } 1139: RegisterHandler("fetchuserfile", \&FetchUserFileHandler, 0, 1, 0); 1140: # 1141: # Authenticate access to a user file. 1142: # 1143: # Parameters: 1144: # $cmd - The command that got us here. 1145: # $tail - Tail of the command (remaining parameters). 1146: # $client - File descriptor connected to client. 1147: # Returns 1148: # 0 - Requested to exit, caller should shut down. 1149: # 1 - Continue processing. 1150: sub AuthenticateUserFileAccess { 1151: my $cmd = shift; 1152: my $tail = shift; 1153: my $client = shift; 1154: my $userinput = "$cmd:$tail"; 1155: 1156: my ($fname,$session)=split(/:/,$tail); 1157: chomp($session); 1158: my $reply='non_auth'; 1159: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) { 1160: while (my $line=<ENVIN>) { 1161: if ($line=~/userfile\.$fname\=/) { 1162: $reply='ok'; 1163: } 1164: } 1165: close(ENVIN); 1166: Reply($client, $reply."\n", $userinput); 1167: } else { 1168: Failure($client, "invalid_token\n", $userinput); 1169: } 1170: return 1; 1171: 1172: } 1173: RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0); 1174: # 1175: # Unsubscribe from a resource. 1176: # 1177: # Parameters: 1178: # $cmd - The command that got us here. 1179: # $tail - Tail of the command (remaining parameters). 1180: # $client - File descriptor connected to client. 1181: # Returns 1182: # 0 - Requested to exit, caller should shut down. 1183: # 1 - Continue processing. 1184: # 1185: sub UnsubscribeHandler { 1186: my $cmd = shift; 1187: my $tail = shift; 1188: my $client = shift; 1189: my $userinput= "$cmd:$tail"; 1190: 1191: my $fname = $tail; 1192: if (-e $fname) { 1193: Reply($client, &unsub($client,$fname,$clientip), $userinput); 1194: } else { 1195: Failure($client, "not_found\n", $userinput); 1196: } 1197: return 1; 1198: } 1199: RegisterHandler("unusb", \&UnsubscribeHandler, 0, 1, 0); 1200: 1201: # Subscribe to a resource 1202: # 1203: # Parameters: 1204: # $cmd - The command that got us here. 1205: # $tail - Tail of the command (remaining parameters). 1206: # $client - File descriptor connected to client. 1207: # Returns 1208: # 0 - Requested to exit, caller should shut down. 1209: # 1 - Continue processing. 1210: # 1211: sub SubscribeHandler { 1212: my $cmd = shift; 1213: my $tail = shift; 1214: my $client = shift; 1215: my $userinput = "$cmd:$tail"; 1216: 1217: Reply( $client, &subscribe($userinput,$clientip), $userinput); 1218: 1219: return 1; 1220: } 1221: RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0); 1222: 1223: # 1224: # Determine the version of a resource (?) Or is it return 1225: # the top version of the resource? Not yet clear from the 1226: # code in currentversion. 1227: # 1228: # Parameters: 1229: # $cmd - The command that got us here. 1230: # $tail - Tail of the command (remaining parameters). 1231: # $client - File descriptor connected to client. 1232: # Returns 1233: # 0 - Requested to exit, caller should shut down. 1234: # 1 - Continue processing. 1235: # 1236: sub CurrentVersionHandler { 1237: my $cmd = shift; 1238: my $tail = shift; 1239: my $client = shift; 1240: my $userinput= "$cmd:$tail"; 1241: 1242: my $fname = $tail; 1243: Reply( $client, &currentversion($fname)."\n", $userinput); 1244: return 1; 1245: 1246: } 1247: RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0); 1248: 1249: 1250: # Make an entry in a user's activity log. 1251: # 1252: # Parameters: 1253: # $cmd - The command that got us here. 1254: # $tail - Tail of the command (remaining parameters). 1255: # $client - File descriptor connected to client. 1256: # Returns 1257: # 0 - Requested to exit, caller should shut down. 1258: # 1 - Continue processing. 1259: # 1260: sub ActivityLogEntryHandler { 1261: my $cmd = shift; 1262: my $tail = shift; 1263: my $client = shift; 1264: my $userinput= "$cmd:$tail"; 1265: 1266: my ($udom,$uname,$what)=split(/:/,$tail); 1267: chomp($what); 1268: my $proname=propath($udom,$uname); 1269: my $now=time; 1270: my $hfh; 1271: if ($hfh=IO::File->new(">>$proname/activity.log")) { 1272: print $hfh "$now:$clientname:$what\n"; 1273: Reply( $client, "ok\n", $userinput); 1274: } else { 1275: Failure($client, "error: ".($!+0)." IO::File->new Failed " 1276: ."while attempting log\n", 1277: $userinput); 1278: } 1279: 1280: return 1; 1281: } 1282: RegisterHandler("log", \&ActivityLogEntryHandler, 0, 1, 0); 1283: # 1284: # Put a namespace entry in a user profile hash. 1285: # My druthers would be for this to be an encrypted interaction too. 1286: # anything that might be an inadvertent covert channel about either 1287: # user authentication or user personal information.... 1288: # 1289: # Parameters: 1290: # $cmd - The command that got us here. 1291: # $tail - Tail of the command (remaining parameters). 1292: # $client - File descriptor connected to client. 1293: # Returns 1294: # 0 - Requested to exit, caller should shut down. 1295: # 1 - Continue processing. 1296: # 1297: sub PutUserProfileEntry { 1298: my $cmd = shift; 1299: my $tail = shift; 1300: my $client = shift; 1301: my $userinput = "$cmd:$tail"; 1302: 1303: my ($udom,$uname,$namespace,$what) =split(/:/,$tail); 1304: if ($namespace ne 'roles') { 1305: chomp($what); 1306: my $hashref = TieUserHash($udom, $uname, $namespace, 1307: &GDBM_WRCREAT(),"P",$what); 1308: if($hashref) { 1309: my @pairs=split(/\&/,$what); 1310: foreach my $pair (@pairs) { 1311: my ($key,$value)=split(/=/,$pair); 1312: $hashref->{$key}=$value; 1313: } 1314: if (untie(%$hashref)) { 1315: Reply( $client, "ok\n", $userinput); 1316: } else { 1317: Failure($client, "error: ".($!+0)." untie(GDBM) failed ". 1318: "while attempting put\n", 1319: $userinput); 1320: } 1321: } else { 1322: Failure( $client, "error: ".($!)." tie(GDBM) Failed ". 1323: "while attempting put\n", $userinput); 1324: } 1325: } else { 1326: Failure( $client, "refused\n", $userinput); 1327: } 1328: 1329: return 1; 1330: } 1331: RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0); 1332: 1333: # 1334: # Increment a profile entry in the user history file. 1335: # The history contains keyword value pairs. In this case, 1336: # The value itself is a pair of numbers. The first, the current value 1337: # the second an increment that this function applies to the current 1338: # value. 1339: # 1340: # Parameters: 1341: # $cmd - The command that got us here. 1342: # $tail - Tail of the command (remaining parameters). 1343: # $client - File descriptor connected to client. 1344: # Returns 1345: # 0 - Requested to exit, caller should shut down. 1346: # 1 - Continue processing. 1347: # 1348: sub IncrementUserValueHandler { 1349: my $cmd = shift; 1350: my $tail = shift; 1351: my $client = shift; 1352: my $userinput = "$cmd:$tail"; 1353: 1354: my ($udom,$uname,$namespace,$what) =split(/:/,$tail); 1355: if ($namespace ne 'roles') { 1356: chomp($what); 1357: my $hashref = TieUserHash($udom, $uname, 1358: $namespace, &GDBM_WRCREAT(), 1359: "P",$what); 1360: if ($hashref) { 1361: my @pairs=split(/\&/,$what); 1362: foreach my $pair (@pairs) { 1363: my ($key,$value)=split(/=/,$pair); 1364: # We could check that we have a number... 1365: if (! defined($value) || $value eq '') { 1366: $value = 1; 1367: } 1368: $hashref->{$key}+=$value; 1369: } 1370: if (untie(%$hashref)) { 1371: Reply( $client, "ok\n", $userinput); 1372: } else { 1373: Failure($client, "error: ".($!+0)." untie(GDBM) failed ". 1374: "while attempting inc\n", $userinput); 1375: } 1376: } else { 1377: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1378: "while attempting inc\n", $userinput); 1379: } 1380: } else { 1381: Failure($client, "refused\n", $userinput); 1382: } 1383: 1384: return 1; 1385: } 1386: RegisterHandler("inc", \&IncrementUserValueHandler, 0, 1, 0); 1387: # 1388: # Put a new role for a user. Roles are LonCAPA's packaging of permissions. 1389: # Each 'role' a user has implies a set of permissions. Adding a new role 1390: # for a person grants the permissions packaged with that role 1391: # to that user when the role is selected. 1392: # 1393: # Parameters: 1394: # $cmd - The command string (rolesput). 1395: # $tail - The remainder of the request line. For rolesput this 1396: # consists of a colon separated list that contains: 1397: # The domain and user that is granting the role (logged). 1398: # The domain and user that is getting the role. 1399: # The roles being granted as a set of & separated pairs. 1400: # each pair a key value pair. 1401: # $client - File descriptor connected to the client. 1402: # Returns: 1403: # 0 - If the daemon should exit 1404: # 1 - To continue processing. 1405: # 1406: # 1407: sub RolesPutHandler { 1408: my $cmd = shift; 1409: my $tail = shift; 1410: my $client = shift; 1411: my $userinput = "$cmd:$tail"; 1412: 1413: my ($exedom,$exeuser,$udom,$uname,$what) =split(/:/,$tail); 1414: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom. 1415: "what = ".$what); 1416: my $namespace='roles'; 1417: chomp($what); 1418: my $hashref = TieUserHash($udom, $uname, $namespace, 1419: &GDBM_WRCREAT(), "P", 1420: "$exedom:$exeuser:$what"); 1421: # 1422: # Log the attempt to set a role. The {}'s here ensure that the file 1423: # handle is open for the minimal amount of time. Since the flush 1424: # is done on close this improves the chances the log will be an un- 1425: # corrupted ordered thing. 1426: if ($hashref) { 1427: my @pairs=split(/\&/,$what); 1428: foreach my $pair (@pairs) { 1429: my ($key,$value)=split(/=/,$pair); 1430: &ManagePermissions($key, $udom, $uname, 1431: &GetAuthType( $udom, $uname)); 1432: $hashref->{$key}=$value; 1433: } 1434: if (untie($hashref)) { 1435: Reply($client, "ok\n", $userinput); 1436: } else { 1437: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1438: "while attempting rolesput\n", $userinput); 1439: } 1440: } else { 1441: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1442: "while attempting rolesput\n", $userinput); 1443: } 1444: return 1; 1445: } 1446: RegisterHandler("rolesput", \&RolesPutHandler, 1,1,0); # Encoded client only. 1447: # 1448: # Deletes (removes) a role for a user. This is equivalent to removing 1449: # a permissions package associated with the role from the user's profile. 1450: # 1451: # Parameters: 1452: # $cmd - The command (rolesdel) 1453: # $tail - The remainder of the request line. This consists 1454: # of: 1455: # The domain and user requesting the change (logged) 1456: # The domain and user being changed. 1457: # The roles being revoked. These are shipped to us 1458: # as a bunch of & separated role name keywords. 1459: # $client - The file handle open on the client. 1460: # Returns: 1461: # 1 - Continue processing 1462: # 0 - Exit. 1463: # 1464: sub RolesDeleteHandler { 1465: my $cmd = shift; 1466: my $tail = shift; 1467: my $client = shift; 1468: my $userinput = "$cmd:$tail"; 1469: 1470: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail); 1471: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom. 1472: "what = ".$what); 1473: my $namespace='roles'; 1474: chomp($what); 1475: my $hashref = TieUserHash($udom, $uname, $namespace, 1476: &GDBM_WRCREAT(), "D", 1477: "$exedom:$exeuser:$what"); 1478: 1479: if ($hashref) { 1480: my @rolekeys=split(/\&/,$what); 1481: 1482: foreach my $key (@rolekeys) { 1483: delete $hashref->{$key}; 1484: } 1485: if (untie(%$hashref)) { 1486: Reply($client, "ok\n", $userinput); 1487: } else { 1488: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1489: "while attempting rolesdel\n", $userinput); 1490: } 1491: } else { 1492: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1493: "while attempting rolesdel\n", $userinput); 1494: } 1495: 1496: return 1; 1497: } 1498: RegisterHandler("rolesdel", \&RolesDeleteHandler, 1,1, 0); # Encoded client only 1499: 1500: # Unencrypted get from a user's profile database. See 1501: # GetProfileEntryEncrypted for a version that does end-to-end encryption. 1502: # This function retrieves a keyed item from a specific named database in the 1503: # user's directory. 1504: # 1505: # Parameters: 1506: # $cmd - Command request keyword (get). 1507: # $tail - Tail of the command. This is a colon separated list 1508: # consisting of the domain and username that uniquely 1509: # identifies the profile, 1510: # The 'namespace' which selects the gdbm file to 1511: # do the lookup in, 1512: # & separated list of keys to lookup. Note that 1513: # the values are returned as an & separated list too. 1514: # $client - File descriptor open on the client. 1515: # Returns: 1516: # 1 - Continue processing. 1517: # 0 - Exit. 1518: # 1519: sub GetProfileEntry { 1520: my $cmd = shift; 1521: my $tail = shift; 1522: my $client = shift; 1523: my $userinput= "$cmd:$tail"; 1524: 1525: my ($udom,$uname,$namespace,$what) = split(/:/,$tail); 1526: chomp($what); 1527: my $hashref = TieUserHash($udom, $uname, $namespace, 1528: &GDBM_READER()); 1529: if ($hashref) { 1530: my @queries=split(/\&/,$what); 1531: my $qresult=''; 1532: 1533: for (my $i=0;$i<=$#queries;$i++) { 1534: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string. 1535: } 1536: $qresult=~s/\&$//; # Remove trailing & from last lookup. 1537: if (untie(%$hashref)) { 1538: Reply($client, "$qresult\n", $userinput); 1539: } else { 1540: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1541: "while attempting get\n", $userinput); 1542: } 1543: } else { 1544: if ($!+0 == 2) { # +0 coerces errno -> number 2 is ENOENT 1545: Failure($client, "error:No such file or ". 1546: "GDBM reported bad block error\n", $userinput); 1547: } else { # Some other undifferentiated err. 1548: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1549: "while attempting get\n", $userinput); 1550: } 1551: } 1552: return 1; 1553: } 1554: RegisterHandler("get", \&GetProfileEntry, 0,1,0); 1555: # 1556: # Process the encrypted get request. Note that the request is sent 1557: # in clear, but the reply is encrypted. This is a small covert channel: 1558: # information about the sensitive keys is given to the snooper. Just not 1559: # information about the values of the sensitive key. Hmm if I wanted to 1560: # know these I'd snoop for the egets. Get the profile item names from them 1561: # and then issue a get for them since there's no enforcement of the 1562: # requirement of an encrypted get for particular profile items. If I 1563: # were re-doing this, I'd force the request to be encrypted as well as the 1564: # reply. I'd also just enforce encrypted transactions for all gets since 1565: # that would prevent any covert channel snooping. 1566: # 1567: # Parameters: 1568: # $cmd - Command keyword of request (eget). 1569: # $tail - Tail of the command. See GetProfileEntry # for more information about this. 1570: # $client - File open on the client. 1571: # Returns: 1572: # 1 - Continue processing 1573: # 0 - server should exit. 1574: sub GetProfileEntryEncrypted { 1575: my $cmd = shift; 1576: my $tail = shift; 1577: my $client = shift; 1578: my $userinput = "$cmd:$tail"; 1579: 1580: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput); 1581: chomp($what); 1582: my $hashref = TieUserHash($udom, $uname, $namespace, 1583: &GDBM_READER()); 1584: if ($hashref) { 1585: my @queries=split(/\&/,$what); 1586: my $qresult=''; 1587: for (my $i=0;$i<=$#queries;$i++) { 1588: $qresult.="$hashref->{$queries[$i]}&"; 1589: } 1590: if (untie(%$hashref)) { 1591: $qresult=~s/\&$//; 1592: if ($cipher) { 1593: my $cmdlength=length($qresult); 1594: $qresult.=" "; 1595: my $encqresult=''; 1596: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) { 1597: $encqresult.= unpack("H16", 1598: $cipher->encrypt(substr($qresult, 1599: $encidx, 1600: 8))); 1601: } 1602: Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput); 1603: } else { 1604: Failure( $client, "error:no_key\n", $userinput); 1605: } 1606: } else { 1607: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1608: "while attempting eget\n", $userinput); 1609: } 1610: } else { 1611: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1612: "while attempting eget\n", $userinput); 1613: } 1614: 1615: return 1; 1616: } 1617: RegisterHandler("eget", \&GetProfileEntryEncrypted, 0, 1, 0); 1618: 1619: # 1620: # Deletes a key in a user profile database. 1621: # 1622: # Parameters: 1623: # $cmd - Command keyword (del). 1624: # $tail - Command tail. IN this case a colon 1625: # separated list containing: 1626: # The domain and user that identifies uniquely 1627: # the identity of the user. 1628: # The profile namespace (name of the profile 1629: # database file). 1630: # & separated list of keywords to delete. 1631: # $client - File open on client socket. 1632: # Returns: 1633: # 1 - Continue processing 1634: # 0 - Exit server. 1635: # 1636: # 1637: 1638: sub DeleteProfileEntry { 1639: my $cmd = shift; 1640: my $tail = shift; 1641: my $client = shift; 1642: my $userinput = "cmd:$tail"; 1643: 1644: my ($udom,$uname,$namespace,$what) = split(/:/,$tail); 1645: chomp($what); 1646: my $hashref = TieUserHash($udom, $uname, $namespace, 1647: &GDBM_WRCREAT(), 1648: "D",$what); 1649: if ($hashref) { 1650: my @keys=split(/\&/,$what); 1651: foreach my $key (@keys) { 1652: delete($hashref->{$key}); 1653: } 1654: if (untie(%$hashref)) { 1655: Reply($client, "ok\n", $userinput); 1656: } else { 1657: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1658: "while attempting del\n", $userinput); 1659: } 1660: } else { 1661: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1662: "while attempting del\n", $userinput); 1663: } 1664: return 1; 1665: } 1666: RegisterHandler("del", \&DeleteProfileEntry, 0, 1, 0); 1667: # 1668: # List the set of keys that are defined in a profile database file. 1669: # A successful reply from this will contain an & separated list of 1670: # the keys. 1671: # Parameters: 1672: # $cmd - Command request (keys). 1673: # $tail - Remainder of the request, a colon separated 1674: # list containing domain/user that identifies the 1675: # user being queried, and the database namespace 1676: # (database filename essentially). 1677: # $client - File open on the client. 1678: # Returns: 1679: # 1 - Continue processing. 1680: # 0 - Exit the server. 1681: # 1682: sub GetProfileKeys { 1683: my $cmd = shift; 1684: my $tail = shift; 1685: my $client = shift; 1686: my $userinput = "$cmd:$tail"; 1687: 1688: my ($udom,$uname,$namespace)=split(/:/,$tail); 1689: my $qresult=''; 1690: my $hashref = TieUserHash($udom, $uname, $namespace, 1691: &GDBM_READER()); 1692: if ($hashref) { 1693: foreach my $key (keys %$hashref) { 1694: $qresult.="$key&"; 1695: } 1696: if (untie(%$hashref)) { 1697: $qresult=~s/\&$//; 1698: Reply($client, "$qresult\n", $userinput); 1699: } else { 1700: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1701: "while attempting keys\n", $userinput); 1702: } 1703: } else { 1704: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1705: "while attempting keys\n", $userinput); 1706: } 1707: 1708: return 1; 1709: } 1710: RegisterHandler("keys", \&GetProfileKeys, 0, 1, 0); 1711: # 1712: # Dump the contents of a user profile database. 1713: # Note that this constitutes a very large covert channel too since 1714: # the dump will return sensitive information that is not encrypted. 1715: # The naive security assumption is that the session negotiation ensures 1716: # our client is trusted and I don't believe that's assured at present. 1717: # Sure want badly to go to ssl or tls. Of course if my peer isn't really 1718: # a LonCAPA node they could have negotiated an encryption key too so >sigh<. 1719: # 1720: # Parameters: 1721: # $cmd - The command request keyword (currentdump). 1722: # $tail - Remainder of the request, consisting of a colon 1723: # separated list that has the domain/username and 1724: # the namespace to dump (database file). 1725: # $client - file open on the remote client. 1726: # Returns: 1727: # 1 - Continue processing. 1728: # 0 - Exit the server. 1729: # 1730: sub DumpProfileDatabase { 1731: my $cmd = shift; 1732: my $tail = shift; 1733: my $client = shift; 1734: my $userinput = "$cmd:$tail"; 1735: 1736: my ($udom,$uname,$namespace) = split(/:/,$tail); 1737: my $hashref = TieUserHash($udom, $uname, $namespace, 1738: &GDBM_READER()); 1739: if ($hashref) { 1740: # Structure of %data: 1741: # $data{$symb}->{$parameter}=$value; 1742: # $data{$symb}->{'v.'.$parameter}=$version; 1743: # since $parameter will be unescaped, we do not 1744: # have to worry about silly parameter names... 1745: 1746: my $qresult=''; 1747: my %data = (); # A hash of anonymous hashes.. 1748: while (my ($key,$value) = each(%$hashref)) { 1749: my ($v,$symb,$param) = split(/:/,$key); 1750: next if ($v eq 'version' || $symb eq 'keys'); 1751: next if (exists($data{$symb}) && 1752: exists($data{$symb}->{$param}) && 1753: $data{$symb}->{'v.'.$param} > $v); 1754: $data{$symb}->{$param}=$value; 1755: $data{$symb}->{'v.'.$param}=$v; 1756: } 1757: if (untie(%$hashref)) { 1758: while (my ($symb,$param_hash) = each(%data)) { 1759: while(my ($param,$value) = each (%$param_hash)){ 1760: next if ($param =~ /^v\./); # Ignore versions... 1761: # 1762: # Just dump the symb=value pairs separated by & 1763: # 1764: $qresult.=$symb.':'.$param.'='.$value.'&'; 1765: } 1766: } 1767: chop($qresult); 1768: Reply($client , "$qresult\n", $userinput); 1769: } else { 1770: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1771: "while attempting currentdump\n", $userinput); 1772: } 1773: } else { 1774: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1775: "while attempting currentdump\n", $userinput); 1776: } 1777: 1778: return 1; 1779: } 1780: RegisterHandler("currentdump", \&DumpProfileDatabase, 0, 1, 0); 1781: # 1782: # Dump a profile database with an optional regular expression 1783: # to match against the keys. In this dump, no effort is made 1784: # to separate symb from version information. Presumably the 1785: # databases that are dumped by this command are of a different 1786: # structure. Need to look at this and improve the documentation of 1787: # both this and the currentdump handler. 1788: # Parameters: 1789: # $cmd - The command keyword. 1790: # $tail - All of the characters after the $cmd: 1791: # These are expected to be a colon 1792: # separated list containing: 1793: # domain/user - identifying the user. 1794: # namespace - identifying the database. 1795: # regexp - optional regular expression 1796: # that is matched against 1797: # database keywords to do 1798: # selective dumps. 1799: # $client - Channel open on the client. 1800: # Returns: 1801: # 1 - Continue processing. 1802: # Side effects: 1803: # response is written to $client. 1804: # 1805: sub DumpWithRegexp { 1806: my $cmd = shift; 1807: my $tail = shift; 1808: my $client = shift; 1809: 1810: my $userinput = "$cmd:$tail"; 1811: 1812: my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail); 1813: if (defined($regexp)) { 1814: $regexp=&unescape($regexp); 1815: } else { 1816: $regexp='.'; 1817: } 1818: my $hashref =TieUserHash($udom, $uname, $namespace, 1819: &GDBM_READER()); 1820: if ($hashref) { 1821: my $qresult=''; 1822: while (my ($key,$value) = each(%$hashref)) { 1823: if ($regexp eq '.') { 1824: $qresult.=$key.'='.$value.'&'; 1825: } else { 1826: my $unescapeKey = &unescape($key); 1827: if (eval('$unescapeKey=~/$regexp/')) { 1828: $qresult.="$key=$value&"; 1829: } 1830: } 1831: } 1832: if (untie(%$hashref)) { 1833: chop($qresult); 1834: Reply($client, "$qresult\n", $userinput); 1835: } else { 1836: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1837: "while attempting dump\n", $userinput); 1838: } 1839: } else { 1840: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1841: "while attempting dump\n", $userinput); 1842: } 1843: 1844: return 1; 1845: } 1846: RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0); 1847: 1848: # Store an aitem in any resource meta data(?) or database with 1849: # versioning? 1850: # 1851: # Parameters: 1852: # $cmd - Request command keyword. 1853: # $tail - Tail of the request. This is a colon 1854: # separated list containing: 1855: # domain/user - User and authentication domain. 1856: # namespace - Name of the database being modified 1857: # rid - Resource keyword to modify. 1858: # what - new value associated with rid. 1859: # 1860: # $client - Socket open on the client. 1861: # 1862: # 1863: # Returns: 1864: # 1 (keep on processing). 1865: # Side-Effects: 1866: # Writes to the client 1867: sub StoreHandler { 1868: my $cmd = shift; 1869: my $tail = shift; 1870: my $client = shift; 1871: 1872: my $userinput = "$cmd:$tail"; 1873: 1874: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail); 1875: if ($namespace ne 'roles') { 1876: 1877: chomp($what); 1878: my @pairs=split(/\&/,$what); 1879: my $hashref = TieUserHash($udom, $uname, $namespace, 1880: &GDBM_WRCREAT(), "P", 1881: "$rid:$what"); 1882: if ($hashref) { 1883: my $now = time; 1884: my @previouskeys=split(/&/,$hashref->{"keys:$rid"}); 1885: my $key; 1886: $hashref->{"version:$rid"}++; 1887: my $version=$hashref->{"version:$rid"}; 1888: my $allkeys=''; 1889: foreach my $pair (@pairs) { 1890: my ($key,$value)=split(/=/,$pair); 1891: $allkeys.=$key.':'; 1892: $hashref->{"$version:$rid:$key"}=$value; 1893: } 1894: $hashref->{"$version:$rid:timestamp"}=$now; 1895: $allkeys.='timestamp'; 1896: $hashref->{"$version:keys:$rid"}=$allkeys; 1897: if (untie($hashref)) { 1898: Reply($client, "ok\n", $userinput); 1899: } else { 1900: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1901: "while attempting store\n", $userinput); 1902: } 1903: } else { 1904: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1905: "while attempting store\n", $userinput); 1906: } 1907: } else { 1908: Failure($client, "refused\n", $userinput); 1909: } 1910: 1911: return 1; 1912: } 1913: RegisterHandler("store", \&StoreHandler, 0, 1, 0); 1914: # 1915: # Restore a prior version of a resource. 1916: # 1917: # Parameters: 1918: # $cmd - Command keyword. 1919: # $tail - Remainder of the request which consists of: 1920: # domain/user - User and auth. domain. 1921: # namespace - name of resource database. 1922: # rid - Resource id. 1923: # $client - socket open on the client. 1924: # 1925: # Returns: 1926: # 1 indicating the caller should not yet exit. 1927: # Side-effects: 1928: # Writes a reply to the client. 1929: # 1930: sub RestoreHandler { 1931: my $cmd = shift; 1932: my $tail = shift; 1933: my $client = shift; 1934: 1935: my $userinput = "$cmd:$tail"; # Only used for logging purposes. 1936: 1937: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput); 1938: $namespace=~s/\//\_/g; 1939: $namespace=~s/\W//g; 1940: chomp($rid); 1941: my $proname=propath($udom,$uname); 1942: my $qresult=''; 1943: my %hash; 1944: if (tie(%hash,'GDBM_File',"$proname/$namespace.db", 1945: &GDBM_READER(),0640)) { 1946: my $version=$hash{"version:$rid"}; 1947: $qresult.="version=$version&"; 1948: my $scope; 1949: for ($scope=1;$scope<=$version;$scope++) { 1950: my $vkeys=$hash{"$scope:keys:$rid"}; 1951: my @keys=split(/:/,$vkeys); 1952: my $key; 1953: $qresult.="$scope:keys=$vkeys&"; 1954: foreach $key (@keys) { 1955: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&"; 1956: } 1957: } 1958: if (untie(%hash)) { 1959: $qresult=~s/\&$//; 1960: Reply( $client, "$qresult\n", $userinput); 1961: } else { 1962: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1963: "while attempting restore\n", $userinput); 1964: } 1965: } else { 1966: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1967: "while attempting restore\n", $userinput); 1968: } 1969: 1970: return 1; 1971: 1972: 1973: } 1974: RegisterHandler("restore", \&RestoreHandler, 0,1,0); 1975: 1976: # 1977: # Add a chat message to to a discussion board. 1978: # 1979: # Parameters: 1980: # $cmd - Request keyword. 1981: # $tail - Tail of the command. A colon separated list 1982: # containing: 1983: # cdom - Domain on which the chat board lives 1984: # cnum - Identifier of the discussion group. 1985: # post - Body of the posting. 1986: # $client - Socket open on the client. 1987: # Returns: 1988: # 1 - Indicating caller should keep on processing. 1989: # 1990: # Side-effects: 1991: # writes a reply to the client. 1992: # 1993: # 1994: sub SendChatHandler { 1995: my $cmd = shift; 1996: my $tail = shift; 1997: my $client = shift; 1998: 1999: my $userinput = "$cmd:$tail"; 2000: 2001: my ($cdom,$cnum,$newpost)=split(/\:/,$tail); 2002: &chatadd($cdom,$cnum,$newpost); 2003: Reply($client, "ok\n", $userinput); 2004: 2005: return 1; 2006: } 2007: RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0); 2008: # 2009: # Retrieve the set of chat messagss from a discussion board. 2010: # 2011: # Parameters: 2012: # $cmd - Command keyword that initiated the request. 2013: # $tail - Remainder of the request after the command 2014: # keyword. In this case a colon separated list of 2015: # chat domain - Which discussion board. 2016: # chat id - Discussion thread(?) 2017: # domain/user - Authentication domain and username 2018: # of the requesting person. 2019: # $client - Socket open on the client program. 2020: # Returns: 2021: # 1 - continue processing 2022: # Side effects: 2023: # Response is written to the client. 2024: # 2025: sub RetrieveChatHandler { 2026: my $cmd = shift; 2027: my $tail = shift; 2028: my $client = shift; 2029: 2030: my $userinput = "$cmd:$tail"; 2031: 2032: my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail); 2033: my $reply=''; 2034: foreach (&getchat($cdom,$cnum,$udom,$uname)) { 2035: $reply.=&escape($_).':'; 2036: } 2037: $reply=~s/\:$//; 2038: Reply($client, $reply."\n", $userinput); 2039: 2040: 2041: return 1; 2042: } 2043: RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0); 2044: # 2045: # Initiate a query of an sql database. SQL query repsonses get put in 2046: # a file for later retrieval. This prevents sql query results from 2047: # bottlenecking the system. Note that with loncnew, perhaps this is 2048: # less of an issue since multiple outstanding requests can be concurrently 2049: # serviced. 2050: # 2051: # Parameters: 2052: # $cmd - COmmand keyword that initiated the request. 2053: # $tail - Remainder of the command after the keyword. 2054: # For this function, this consists of a query and 2055: # 3 arguments that are self-documentingly labelled 2056: # in the original arg1, arg2, arg3. 2057: # $client - Socket open on the client. 2058: # Return: 2059: # 1 - Indicating processing should continue. 2060: # Side-effects: 2061: # a reply is written to $client. 2062: # 2063: sub SendQueryHandler { 2064: my $cmd = shift; 2065: my $tail = shift; 2066: my $client = shift; 2067: 2068: my $userinput = "$cmd:$tail"; 2069: 2070: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail); 2071: $query=~s/\n*$//g; 2072: Reply($client, "". sqlreply("$clientname\&$query". 2073: "\&$arg1"."\&$arg2"."\&$arg3")."\n", 2074: $userinput); 2075: 2076: return 1; 2077: } 2078: RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0); 2079: 2080: # 2081: # Add a reply to an sql query. SQL queries are done asyncrhonously. 2082: # The query is submitted via a "querysend" transaction. 2083: # There it is passed on to the lonsql daemon, queued and issued to 2084: # mysql. 2085: # This transaction is invoked when the sql transaction is complete 2086: # it stores the query results in flie and indicates query completion. 2087: # presumably local software then fetches this response... I'm guessing 2088: # the sequence is: lonc does a querysend, we ask lonsql to do it. 2089: # lonsql on completion of the query interacts with the lond of our 2090: # client to do a query reply storing two files: 2091: # - id - The results of the query. 2092: # - id.end - Indicating the transaction completed. 2093: # NOTE: id is a unique id assigned to the query and querysend time. 2094: # Parameters: 2095: # $cmd - Command keyword that initiated this request. 2096: # $tail - Remainder of the tail. In this case that's a colon 2097: # separated list containing the query Id and the 2098: # results of the query. 2099: # $client - Socket open on the client. 2100: # Return: 2101: # 1 - Indicating that we should continue processing. 2102: # Side effects: 2103: # ok written to the client. 2104: # 2105: sub ReplyQueryHandler { 2106: my $cmd = shift; 2107: my $tail = shift; 2108: my $client = shift; 2109: 2110: my $userinput = "$cmd:$tail"; 2111: 2112: my ($cmd,$id,$reply)=split(/:/,$userinput); 2113: my $store; 2114: my $execdir=$perlvar{'lonDaemons'}; 2115: if ($store=IO::File->new(">$execdir/tmp/$id")) { 2116: $reply=~s/\&/\n/g; 2117: print $store $reply; 2118: close $store; 2119: my $store2=IO::File->new(">$execdir/tmp/$id.end"); 2120: print $store2 "done\n"; 2121: close $store2; 2122: Reply($client, "ok\n", $userinput); 2123: } else { 2124: Failure($client, "error: ".($!+0) 2125: ." IO::File->new Failed ". 2126: "while attempting queryreply\n", $userinput); 2127: } 2128: 2129: 2130: return 1; 2131: } 2132: RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0); 2133: # 2134: # Process the courseidput query. Not quite sure what this means 2135: # at the system level sense. It appears a gdbm file in the 2136: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and 2137: # a set of entries made in that database. 2138: # 2139: # Parameters: 2140: # $cmd - The command keyword that initiated this request. 2141: # $tail - Tail of the command. In this case consists of a colon 2142: # separated list contaning the domain to apply this to and 2143: # an ampersand separated list of keyword=value pairs. 2144: # $client - Socket open on the client. 2145: # Returns: 2146: # 1 - indicating that processing should continue 2147: # 2148: # Side effects: 2149: # reply is written to the client. 2150: # 2151: sub PutCourseIdHandler { 2152: my $cmd = shift; 2153: my $tail = shift; 2154: my $client = shift; 2155: 2156: my $userinput = "$cmd:$tail"; 2157: 2158: my ($udom, $what) = split(/:/, $tail); 2159: chomp($what); 2160: my $now=time; 2161: my @pairs=split(/\&/,$what); 2162: 2163: my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT()); 2164: if ($hashref) { 2165: foreach my $pair (@pairs) { 2166: my ($key,$value)=split(/=/,$pair); 2167: $hashref->{$key}=$value.':'.$now; 2168: } 2169: if (untie(%$hashref)) { 2170: Reply($client, "ok\n", $userinput); 2171: } else { 2172: Failure( $client, "error: ".($!+0) 2173: ." untie(GDBM) Failed ". 2174: "while attempting courseidput\n", $userinput); 2175: } 2176: } else { 2177: Failure( $client, "error: ".($!+0) 2178: ." tie(GDBM) Failed ". 2179: "while attempting courseidput\n", $userinput); 2180: } 2181: 2182: return 1; 2183: } 2184: RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0); 2185: 2186: # Retrieves the value of a course id resource keyword pattern 2187: # defined since a starting date. Both the starting date and the 2188: # keyword pattern are optional. If the starting date is not supplied it 2189: # is treated as the beginning of time. If the pattern is not found, 2190: # it is treatred as "." matching everything. 2191: # 2192: # Parameters: 2193: # $cmd - Command keyword that resulted in us being dispatched. 2194: # $tail - The remainder of the command that, in this case, consists 2195: # of a colon separated list of: 2196: # domain - The domain in which the course database is 2197: # defined. 2198: # since - Optional parameter describing the minimum 2199: # time of definition(?) of the resources that 2200: # will match the dump. 2201: # description - regular expression that is used to filter 2202: # the dump. Only keywords matching this regexp 2203: # will be used. 2204: # $client - The socket open on the client. 2205: # Returns: 2206: # 1 - Continue processing. 2207: # Side Effects: 2208: # a reply is written to $client. 2209: sub DumpCourseIdHandler { 2210: my $cmd = shift; 2211: my $tail = shift; 2212: my $client = shift; 2213: 2214: my $userinput = "$cmd:$tail"; 2215: 2216: my ($udom,$since,$description) =split(/:/,$tail); 2217: if (defined($description)) { 2218: $description=&unescape($description); 2219: } else { 2220: $description='.'; 2221: } 2222: unless (defined($since)) { $since=0; } 2223: my $qresult=''; 2224: 2225: my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT()); 2226: if ($hashref) { 2227: while (my ($key,$value) = each(%$hashref)) { 2228: my ($descr,$lasttime)=split(/\:/,$value); 2229: if ($lasttime<$since) { 2230: next; 2231: } 2232: if ($description eq '.') { 2233: $qresult.=$key.'='.$descr.'&'; 2234: } else { 2235: my $unescapeVal = &unescape($descr); 2236: if (eval('$unescapeVal=~/$description/i')) { 2237: $qresult.="$key=$descr&"; 2238: } 2239: } 2240: } 2241: if (untie(%$hashref)) { 2242: chop($qresult); 2243: Reply($client, "$qresult\n", $userinput); 2244: } else { 2245: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2246: "while attempting courseiddump\n", $userinput); 2247: } 2248: } else { 2249: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2250: "while attempting courseiddump\n", $userinput); 2251: } 2252: 2253: 2254: return 1; 2255: } 2256: RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0); 2257: # 2258: # Puts an id to a domains id database. 2259: # 2260: # Parameters: 2261: # $cmd - The command that triggered us. 2262: # $tail - Remainder of the request other than the command. This is a 2263: # colon separated list containing: 2264: # $domain - The domain for which we are writing the id. 2265: # $pairs - The id info to write... this is and & separated list 2266: # of keyword=value. 2267: # $client - Socket open on the client. 2268: # Returns: 2269: # 1 - Continue processing. 2270: # Side effects: 2271: # reply is written to $client. 2272: # 2273: sub PutIdHandler { 2274: my $cmd = shift; 2275: my $tail = shift; 2276: my $client = shift; 2277: 2278: my $userinput = "$cmd:$tail"; 2279: 2280: my ($udom,$what)=split(/:/,$tail); 2281: chomp($what); 2282: my @pairs=split(/\&/,$what); 2283: my $hashref = TieDomainHash($udom, "ids", &GDBM_WRCREAT(), 2284: "P", $what); 2285: if ($hashref) { 2286: foreach my $pair (@pairs) { 2287: my ($key,$value)=split(/=/,$pair); 2288: $hashref->{$key}=$value; 2289: } 2290: if (untie(%$hashref)) { 2291: Reply($client, "ok\n", $userinput); 2292: } else { 2293: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2294: "while attempting idput\n", $userinput); 2295: } 2296: } else { 2297: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2298: "while attempting idput\n", $userinput); 2299: } 2300: 2301: return 1; 2302: } 2303: 2304: RegisterHandler("idput", \&PutIdHandler, 0, 1, 0); 2305: # 2306: # Retrieves a set of id values from the id database. 2307: # Returns an & separated list of results, one for each requested id to the 2308: # client. 2309: # 2310: # Parameters: 2311: # $cmd - Command keyword that caused us to be dispatched. 2312: # $tail - Tail of the command. Consists of a colon separated: 2313: # domain - the domain whose id table we dump 2314: # ids Consists of an & separated list of 2315: # id keywords whose values will be fetched. 2316: # nonexisting keywords will have an empty value. 2317: # $client - Socket open on the client. 2318: # 2319: # Returns: 2320: # 1 - indicating processing should continue. 2321: # Side effects: 2322: # An & separated list of results is written to $client. 2323: # 2324: sub GetIdHandler { 2325: my $cmd = shift; 2326: my $tail = shift; 2327: my $client = shift; 2328: 2329: my $userinput = "$client:$tail"; 2330: 2331: my ($udom,$what)=split(/:/,$tail); 2332: chomp($what); 2333: my @queries=split(/\&/,$what); 2334: my $qresult=''; 2335: my $hashref = TieDomainHash($udom, "ids", &GDBM_READER()); 2336: if ($hashref) { 2337: for (my $i=0;$i<=$#queries;$i++) { 2338: $qresult.="$hashref->{$queries[$i]}&"; 2339: } 2340: if (untie(%$hashref)) { 2341: $qresult=~s/\&$//; 2342: Reply($client, "$qresult\n", $userinput); 2343: } else { 2344: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 2345: "while attempting idget\n",$userinput); 2346: } 2347: } else { 2348: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2349: "while attempting idget\n",$userinput); 2350: } 2351: 2352: return 1; 2353: } 2354: 2355: RegisterHandler("idget", \&GetIdHandler, 0, 1, 0); 2356: # 2357: # Process the tmpput command I'm not sure what this does.. Seems to 2358: # create a file in the lonDaemons/tmp directory of the form $id.tmp 2359: # where Id is the client's ip concatenated with a sequence number. 2360: # The file will contain some value that is passed in. Is this e.g. 2361: # a login token? 2362: # 2363: # Parameters: 2364: # $cmd - The command that got us dispatched. 2365: # $tail - The remainder of the request following $cmd: 2366: # In this case this will be the contents of the file. 2367: # $client - Socket connected to the client. 2368: # Returns: 2369: # 1 indicating processing can continue. 2370: # Side effects: 2371: # A file is created in the local filesystem. 2372: # A reply is sent to the client. 2373: sub TmpPutHandler { 2374: my $cmd = shift; 2375: my $what = shift; 2376: my $client = shift; 2377: 2378: my $userinput = "$cmd:$what"; # Reconstruct for logging. 2379: 2380: 2381: my $store; 2382: $tmpsnum++; 2383: my $id=$$.'_'.$clientip.'_'.$tmpsnum; 2384: $id=~s/\W/\_/g; 2385: $what=~s/\n//g; 2386: my $execdir=$perlvar{'lonDaemons'}; 2387: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) { 2388: print $store $what; 2389: close $store; 2390: Reply($client, "$id\n", $userinput); 2391: } else { 2392: Failure( $client, "error: ".($!+0)."IO::File->new Failed ". 2393: "while attempting tmpput\n", $userinput); 2394: } 2395: return 1; 2396: 2397: } 2398: RegisterHandler("tmpput", \&TmpPutHandler, 0, 1, 0); 2399: 2400: # Processes the tmpget command. This command returns the contents 2401: # of a temporary resource file(?) created via tmpput. 2402: # 2403: # Paramters: 2404: # $cmd - Command that got us dispatched. 2405: # $id - Tail of the command, contain the id of the resource 2406: # we want to fetch. 2407: # $client - socket open on the client. 2408: # Return: 2409: # 1 - Inidcating processing can continue. 2410: # Side effects: 2411: # A reply is sent to the client. 2412: 2413: # 2414: sub TmpGetHandler { 2415: my $cmd = shift; 2416: my $id = shift; 2417: my $client = shift; 2418: my $userinput = "$cmd:$id"; 2419: 2420: chomp($id); 2421: $id=~s/\W/\_/g; 2422: my $store; 2423: my $execdir=$perlvar{'lonDaemons'}; 2424: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) { 2425: my $reply=<$store>; 2426: Reply( $client, "$reply\n", $userinput); 2427: close $store; 2428: } else { 2429: Failure( $client, "error: ".($!+0)."IO::File->new Failed ". 2430: "while attempting tmpget\n", $userinput); 2431: } 2432: 2433: return 1; 2434: } 2435: RegisterHandler("tmpget", \&TmpGetHandler, 0, 1, 0); 2436: # 2437: # Process the tmpdel command. This command deletes a temp resource 2438: # created by the tmpput command. 2439: # 2440: # Parameters: 2441: # $cmd - Command that got us here. 2442: # $id - Id of the temporary resource created. 2443: # $client - socket open on the client process. 2444: # 2445: # Returns: 2446: # 1 - Indicating processing should continue. 2447: # Side Effects: 2448: # A file is deleted 2449: # A reply is sent to the client. 2450: sub TmpDelHandler { 2451: my $cmd = shift; 2452: my $id = shift; 2453: my $client = shift; 2454: 2455: my $userinput= "$cmd:$id"; 2456: 2457: chomp($id); 2458: $id=~s/\W/\_/g; 2459: my $execdir=$perlvar{'lonDaemons'}; 2460: if (unlink("$execdir/tmp/$id.tmp")) { 2461: Reply($client, "ok\n", $userinput); 2462: } else { 2463: Failure( $client, "error: ".($!+0)."Unlink tmp Failed ". 2464: "while attempting tmpdel\n", $userinput); 2465: } 2466: 2467: return 1; 2468: 2469: } 2470: RegisterHandler("tmpdel", \&TmpDelHandler, 0, 1, 0); 2471: # 2472: # ls - list the contents of a directory. For each file in the 2473: # selected directory the filename followed by the full output of 2474: # the stat function is returned. The returned info for each 2475: # file are separated by ':'. The stat fields are separated by &'s. 2476: # Parameters: 2477: # $cmd - The command that dispatched us (ls). 2478: # $ulsdir - The directory path to list... I'm not sure what this 2479: # is relative as things like ls:. return e.g. 2480: # no_such_dir. 2481: # $client - Socket open on the client. 2482: # Returns: 2483: # 1 - indicating that the daemon should not disconnect. 2484: # Side Effects: 2485: # The reply is written to $client. 2486: # 2487: sub LsHandler { 2488: my $cmd = shift; 2489: my $ulsdir = shift; 2490: my $client = shift; 2491: 2492: my $userinput = "$cmd:$ulsdir"; 2493: 2494: my $ulsout=''; 2495: my $ulsfn; 2496: if (-e $ulsdir) { 2497: if(-d $ulsdir) { 2498: if (opendir(LSDIR,$ulsdir)) { 2499: while ($ulsfn=readdir(LSDIR)) { 2500: my @ulsstats=stat($ulsdir.'/'.$ulsfn); 2501: $ulsout.=$ulsfn.'&'. 2502: join('&',@ulsstats).':'; 2503: } 2504: closedir(LSDIR); 2505: } 2506: } else { 2507: my @ulsstats=stat($ulsdir); 2508: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':'; 2509: } 2510: } else { 2511: $ulsout='no_such_dir'; 2512: } 2513: if ($ulsout eq '') { $ulsout='empty'; } 2514: Reply($client, "$ulsout\n", $userinput); 2515: 2516: 2517: return 1; 2518: } 2519: RegisterHandler("ls", \&LsHandler, 0, 1, 0); 2520: 2521: 2522: # 2523: # Processes the setannounce command. This command 2524: # creates a file named announce.txt in the top directory of 2525: # the documentn root and sets its contents. The announce.txt file is 2526: # printed in its entirety at the LonCAPA login page. Note: 2527: # once the announcement.txt fileis created it cannot be deleted. 2528: # However, setting the contents of the file to empty removes the 2529: # announcement from the login page of loncapa so who cares. 2530: # 2531: # Parameters: 2532: # $cmd - The command that got us dispatched. 2533: # $announcement - The text of the announcement. 2534: # $client - Socket open on the client process. 2535: # Retunrns: 2536: # 1 - Indicating request processing should continue 2537: # Side Effects: 2538: # The file {DocRoot}/announcement.txt is created. 2539: # A reply is sent to $client. 2540: # 2541: sub SetAnnounceHandler { 2542: my $cmd = shift; 2543: my $announcement = shift; 2544: my $client = shift; 2545: 2546: my $userinput = "$cmd:$announcement"; 2547: 2548: chomp($announcement); 2549: $announcement=&unescape($announcement); 2550: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}. 2551: '/announcement.txt')) { 2552: print $store $announcement; 2553: close $store; 2554: Reply($client, "ok\n", $userinput); 2555: } else { 2556: Failure($client, "error: ".($!+0)."\n", $userinput); 2557: } 2558: 2559: return 1; 2560: } 2561: RegisterHandler("setannounce", \&SetAnnounceHandler, 0, 1, 0); 2562: 2563: # 2564: # Return the version of the daemon. This can be used to determine 2565: # the compatibility of cross version installations or, alternatively to 2566: # simply know who's out of date and who isn't. Note that the version 2567: # is returned concatenated with the tail. 2568: # Parameters: 2569: # $cmd - the request that dispatched to us. 2570: # $tail - Tail of the request (client's version?). 2571: # $client - Socket open on the client. 2572: #Returns: 2573: # 1 - continue processing requests. 2574: # Side Effects: 2575: # Replies with version to $client. 2576: sub GetVersionHandler { 2577: my $client = shift; 2578: my $tail = shift; 2579: my $client = shift; 2580: my $userinput = $client; 2581: 2582: Reply($client, &version($userinput)."\n", $userinput); 2583: 2584: 2585: return 1; 2586: } 2587: RegisterHandler("version", \&GetVersionHandler, 0, 1, 0); 2588: 2589: # Set the current host and domain. This is used to support 2590: # multihomed systems. Each IP of the system, or even separate daemons 2591: # on the same IP can be treated as handling a separate lonCAPA virtual 2592: # machine. This command selects the virtual lonCAPA. The client always 2593: # knows the right one since it is lonc and it is selecting the domain/system 2594: # from the hosts.tab file. 2595: # Parameters: 2596: # $cmd - Command that dispatched us. 2597: # $tail - Tail of the command (domain/host requested). 2598: # $socket - Socket open on the client. 2599: # 2600: # Returns: 2601: # 1 - Indicates the program should continue to process requests. 2602: # Side-effects: 2603: # The default domain/system context is modified for this daemon. 2604: # a reply is sent to the client. 2605: # 2606: sub SelectHostHandler { 2607: my $cmd = shift; 2608: my $tail = shift; 2609: my $socket = shift; 2610: 2611: my $userinput ="$cmd:$tail"; 2612: 2613: Reply($client, &sethost($userinput)."\n", $userinput); 2614: 2615: 2616: return 1; 2617: } 2618: RegisterHandler("sethost", \&SelectHostHandler, 0, 1, 0); 2619: 2620: # Process a request to exit: 2621: # - "bye" is sent to the client. 2622: # - The client socket is shutdown and closed. 2623: # - We indicate to the caller that we should exit. 2624: # Formal Parameters: 2625: # $cmd - The command that got us here. 2626: # $tail - Tail of the command (empty). 2627: # $client - Socket open on the tail. 2628: # Returns: 2629: # 0 - Indicating the program should exit!! 2630: # 2631: sub ExitHandler { 2632: my $cmd = shift; 2633: my $tail = shift; 2634: my $client = shift; 2635: 2636: my $userinput = "$cmd:$tail"; 2637: 2638: &logthis("Client $clientip ($clientname) hanging up: $userinput"); 2639: Reply($client, "bye\n", $userinput); 2640: $client->shutdown(2); # shutdown the socket forcibly. 2641: $client->close(); 2642: 2643: return 0; 2644: } 2645: RegisterHandler("exit", \&ExitHandler, 0, 1,1); 2646: RegisterHandler("init", \&ExitHandler, 0, 1,1); # RE-init is like exit. 2647: RegisterHandler("quit", \&ExitHandler, 0, 1,1); # I like this too! 2648: #------------------------------------------------------------------------------------ 2649: # 2650: # Process a Request. Takes a request from the client validates 2651: # it and performs the operation requested by it. Returns 2652: # a response to the client. 2653: # 2654: # Parameters: 2655: # request - A string containing the user's request. 2656: # Returns: 2657: # 0 - Requested to exit, caller should shut down. 2658: # 1 - Accept additional requests from the client. 2659: # 2660: sub ProcessRequest { 2661: my $Request = shift; 2662: my $KeepGoing = 1; # Assume we're not asked to stop. 2663: 2664: my $wasenc=0; 2665: my $userinput = $Request; # for compatibility with oldcode <yeach> 2666: 2667: 2668: # ------------------------------------------------------------ See if encrypted 2669: 2670: if($userinput =~ /^enc/) { 2671: $wasenc = 1; 2672: $userinput = Decipher($userinput); 2673: if(! $userinput) { 2674: Failure($client,"error:Encrypted data without negotiating key"); 2675: return 0; # Break off with this imposter. 2676: } 2677: } 2678: # Split off the request keyword from the rest of the stuff. 2679: 2680: my ($command, $tail) = split(/:/, $userinput, 2); 2681: 2682: Debug("Command received: $command, encoded = $wasenc"); 2683: 2684: 2685: # ------------------------------------------------------------- Normal commands 2686: 2687: # 2688: # If the command is in the hash, then execute it via the hash dispatch: 2689: # 2690: if(defined $Dispatcher{$command}) { 2691: 2692: my $DispatchInfo = $Dispatcher{$command}; 2693: my $Handler = $$DispatchInfo[0]; 2694: my $NeedEncode = $$DispatchInfo[1]; 2695: my $ClientTypes = $$DispatchInfo[2]; 2696: Debug("Matched dispatch hash: mustencode: $NeedEncode ClientType $ClientTypes"); 2697: 2698: # Validate the request: 2699: 2700: my $ok = 1; 2701: my $requesterprivs = 0; 2702: if(isClient()) { 2703: $requesterprivs |= $CLIENT_OK; 2704: } 2705: if(isManager()) { 2706: $requesterprivs |= $MANAGER_OK; 2707: } 2708: if($NeedEncode && (!$wasenc)) { 2709: Debug("Must encode but wasn't: $NeedEncode $wasenc"); 2710: $ok = 0; 2711: } 2712: if(($ClientTypes & $requesterprivs) == 0) { 2713: Debug("Client not privileged to do this operation"); 2714: $ok = 0; 2715: } 2716: 2717: if($ok) { 2718: Debug("Dispatching to handler $command $tail"); 2719: $KeepGoing = &$Handler($command, $tail, $client); 2720: } else { 2721: Debug("Refusing to dispatch because ok is false"); 2722: Failure($client, "refused", $userinput); 2723: } 2724: 2725: 2726: # ------------------------------------------------------------- unknown command 2727: 2728: } else { 2729: # unknown command 2730: Failure($client, "unknown_cmd\n", $userinput); 2731: } 2732: 2733: return $KeepGoing; 2734: } 2735: 2736: 2737: # 2738: # GetCertificate: Given a transaction that requires a certificate, 2739: # this function will extract the certificate from the transaction 2740: # request. Note that at this point, the only concept of a certificate 2741: # is the hostname to which we are connected. 2742: # 2743: # Parameter: 2744: # request - The request sent by our client (this parameterization may 2745: # need to change when we really use a certificate granting 2746: # authority. 2747: # 2748: sub GetCertificate { 2749: my $request = shift; 2750: 2751: return $clientip; 2752: } 2753: 2754: 2755: 2756: # 2757: # ReadManagerTable: Reads in the current manager table. For now this is 2758: # done on each manager authentication because: 2759: # - These authentications are not frequent 2760: # - This allows dynamic changes to the manager table 2761: # without the need to signal to the lond. 2762: # 2763: 2764: sub ReadManagerTable { 2765: 2766: # Clean out the old table first.. 2767: 2768: foreach my $key (keys %managers) { 2769: delete $managers{$key}; 2770: } 2771: 2772: my $tablename = $perlvar{'lonTabDir'}."/managers.tab"; 2773: if (!open (MANAGERS, $tablename)) { 2774: logthis('No manager table. Nobody can manage!!'); 2775: return; 2776: } 2777: while(my $host = <MANAGERS>) { 2778: chomp($host); 2779: if ($host =~ "^#") { # Comment line. 2780: logthis(' Skipping line: '. "$host\n"); 2781: next; 2782: } 2783: if (!defined $hostip{$host}) { # This is a non cluster member 2784: # The entry is of the form: 2785: # cluname:hostname 2786: # cluname - A 'cluster hostname' is needed in order to negotiate 2787: # the host key. 2788: # hostname- The dns name of the host. 2789: # 2790: my($cluname, $dnsname) = split(/:/, $host); 2791: 2792: my $ip = gethostbyname($dnsname); 2793: if(defined($ip)) { # bad names don't deserve entry. 2794: my $hostip = inet_ntoa($ip); 2795: $managers{$hostip} = $cluname; 2796: logthis(' registering manager '. 2797: "$dnsname as $cluname with $hostip \n"); 2798: } 2799: } else { 2800: logthis(' existing host'." $host\n"); 2801: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber 2802: } 2803: } 2804: } 2805: 2806: # 2807: # ValidManager: Determines if a given certificate represents a valid manager. 2808: # in this primitive implementation, the 'certificate' is 2809: # just the connecting loncapa client name. This is checked 2810: # against a valid client list in the configuration. 2811: # 2812: # 2813: sub ValidManager { 2814: my $certificate = shift; 2815: 2816: return isManager; 2817: } 2818: # 2819: # CopyFile: Called as part of the process of installing a 2820: # new configuration file. This function copies an existing 2821: # file to a backup file. 2822: # Parameters: 2823: # oldfile - Name of the file to backup. 2824: # newfile - Name of the backup file. 2825: # Return: 2826: # 0 - Failure (errno has failure reason). 2827: # 1 - Success. 2828: # 2829: sub CopyFile { 2830: my $oldfile = shift; 2831: my $newfile = shift; 2832: 2833: # The file must exist: 2834: 2835: if(-e $oldfile) { 2836: 2837: # Read the old file. 2838: 2839: my $oldfh = IO::File->new("< $oldfile"); 2840: if(!$oldfh) { 2841: return 0; 2842: } 2843: my @contents = <$oldfh>; # Suck in the entire file. 2844: 2845: # write the backup file: 2846: 2847: my $newfh = IO::File->new("> $newfile"); 2848: if(!(defined $newfh)){ 2849: return 0; 2850: } 2851: my $lines = scalar @contents; 2852: for (my $i =0; $i < $lines; $i++) { 2853: print $newfh ($contents[$i]); 2854: } 2855: 2856: $oldfh->close; 2857: $newfh->close; 2858: 2859: chmod(0660, $newfile); 2860: 2861: return 1; 2862: 2863: } else { 2864: return 0; 2865: } 2866: } 2867: # 2868: # Host files are passed out with externally visible host IPs. 2869: # If, for example, we are behind a fire-wall or NAT host, our 2870: # internally visible IP may be different than the externally 2871: # visible IP. Therefore, we always adjust the contents of the 2872: # host file so that the entry for ME is the IP that we believe 2873: # we have. At present, this is defined as the entry that 2874: # DNS has for us. If by some chance we are not able to get a 2875: # DNS translation for us, then we assume that the host.tab file 2876: # is correct. 2877: # BUGBUGBUG - in the future, we really should see if we can 2878: # easily query the interface(s) instead. 2879: # Parameter(s): 2880: # contents - The contents of the host.tab to check. 2881: # Returns: 2882: # newcontents - The adjusted contents. 2883: # 2884: # 2885: sub AdjustHostContents { 2886: my $contents = shift; 2887: my $adjusted; 2888: my $me = $perlvar{'lonHostID'}; 2889: 2890: foreach my $line (split(/\n/,$contents)) { 2891: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) { 2892: chomp($line); 2893: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line); 2894: if ($id eq $me) { 2895: my $ip = gethostbyname($name); 2896: my $ipnew = inet_ntoa($ip); 2897: $ip = $ipnew; 2898: # Reconstruct the host line and append to adjusted: 2899: 2900: my $newline = "$id:$domain:$role:$name:$ip"; 2901: if($maxcon ne "") { # Not all hosts have loncnew tuning params 2902: $newline .= ":$maxcon:$idleto:$mincon"; 2903: } 2904: $adjusted .= $newline."\n"; 2905: 2906: } else { # Not me, pass unmodified. 2907: $adjusted .= $line."\n"; 2908: } 2909: } else { # Blank or comment never re-written. 2910: $adjusted .= $line."\n"; # Pass blanks and comments as is. 2911: } 2912: } 2913: return $adjusted; 2914: } 2915: # 2916: # InstallFile: Called to install an administrative file: 2917: # - The file is created with <name>.tmp 2918: # - The <name>.tmp file is then mv'd to <name> 2919: # This lugubrious procedure is done to ensure that we are never without 2920: # a valid, even if dated, version of the file regardless of who crashes 2921: # and when the crash occurs. 2922: # 2923: # Parameters: 2924: # Name of the file 2925: # File Contents. 2926: # Return: 2927: # nonzero - success. 2928: # 0 - failure and $! has an errno. 2929: # 2930: sub InstallFile { 2931: my $Filename = shift; 2932: my $Contents = shift; 2933: my $TempFile = $Filename.".tmp"; 2934: 2935: # Open the file for write: 2936: 2937: my $fh = IO::File->new("> $TempFile"); # Write to temp. 2938: if(!(defined $fh)) { 2939: &logthis(' Unable to create '.$TempFile.""); 2940: return 0; 2941: } 2942: # write the contents of the file: 2943: 2944: print $fh ($Contents); 2945: $fh->close; # In case we ever have a filesystem w. locking 2946: 2947: chmod(0660, $TempFile); 2948: 2949: # Now we can move install the file in position. 2950: 2951: move($TempFile, $Filename); 2952: 2953: return 1; 2954: } 2955: # 2956: # ConfigFileFromSelector: converts a configuration file selector 2957: # (one of host or domain at this point) into a 2958: # configuration file pathname. 2959: # 2960: # Parameters: 2961: # selector - Configuration file selector. 2962: # Returns: 2963: # Full path to the file or undef if the selector is invalid. 2964: # 2965: sub ConfigFileFromSelector { 2966: my $selector = shift; 2967: my $tablefile; 2968: 2969: my $tabledir = $perlvar{'lonTabDir'}.'/'; 2970: if ($selector eq "hosts") { 2971: $tablefile = $tabledir."hosts.tab"; 2972: } elsif ($selector eq "domain") { 2973: $tablefile = $tabledir."domain.tab"; 2974: } else { 2975: return undef; 2976: } 2977: return $tablefile; 2978: 2979: } 2980: # 2981: # PushFile: Called to do an administrative push of a file. 2982: # - Ensure the file being pushed is one we support. 2983: # - Backup the old file to <filename.saved> 2984: # - Separate the contents of the new file out from the 2985: # rest of the request. 2986: # - Write the new file. 2987: # Parameter: 2988: # Request - The entire user request. This consists of a : separated 2989: # string pushfile:tablename:contents. 2990: # NOTE: The contents may have :'s in it as well making things a bit 2991: # more interesting... but not much. 2992: # Returns: 2993: # String to send to client ("ok" or "refused" if bad file). 2994: # 2995: sub PushFile { 2996: my $request = shift; 2997: my ($command, $filename, $contents) = split(":", $request, 3); 2998: 2999: # At this point in time, pushes for only the following tables are 3000: # supported: 3001: # hosts.tab ($filename eq host). 3002: # domain.tab ($filename eq domain). 3003: # Construct the destination filename or reject the request. 3004: # 3005: # lonManage is supposed to ensure this, however this session could be 3006: # part of some elaborate spoof that managed somehow to authenticate. 3007: # 3008: 3009: 3010: my $tablefile = ConfigFileFromSelector($filename); 3011: if(! (defined $tablefile)) { 3012: return "refused"; 3013: } 3014: # 3015: # >copy< the old table to the backup table 3016: # don't rename in case system crashes/reboots etc. in the time 3017: # window between a rename and write. 3018: # 3019: my $backupfile = $tablefile; 3020: $backupfile =~ s/\.tab$/.old/; 3021: if(!CopyFile($tablefile, $backupfile)) { 3022: &logthis(' CopyFile from '.$tablefile." to ".$backupfile." failed "); 3023: return "error:$!"; 3024: } 3025: &logthis(' Pushfile: backed up ' 3026: .$tablefile." to $backupfile"); 3027: 3028: # If the file being pushed is the host file, we adjust the entry for ourself so that the 3029: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible 3030: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a 3031: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now) 3032: # that possibilty. 3033: 3034: if($filename eq "host") { 3035: $contents = AdjustHostContents($contents); 3036: } 3037: 3038: # Install the new file: 3039: 3040: if(!InstallFile($tablefile, $contents)) { 3041: &logthis(' Pushfile: unable to install ' 3042: .$tablefile." $! "); 3043: return "error:$!"; 3044: } else { 3045: &logthis(' Installed new '.$tablefile 3046: .""); 3047: 3048: } 3049: 3050: 3051: # Indicate success: 3052: 3053: return "ok"; 3054: 3055: } 3056: 3057: # 3058: # Called to re-init either lonc or lond. 3059: # 3060: # Parameters: 3061: # request - The full request by the client. This is of the form 3062: # reinit:<process> 3063: # where <process> is allowed to be either of 3064: # lonc or lond 3065: # 3066: # Returns: 3067: # The string to be sent back to the client either: 3068: # ok - Everything worked just fine. 3069: # error:why - There was a failure and why describes the reason. 3070: # 3071: # 3072: sub ReinitProcess { 3073: my $request = shift; 3074: 3075: 3076: # separate the request (reinit) from the process identifier and 3077: # validate it producing the name of the .pid file for the process. 3078: # 3079: # 3080: my ($junk, $process) = split(":", $request); 3081: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/'; 3082: if($process eq 'lonc') { 3083: $processpidfile = $processpidfile."lonc.pid"; 3084: if (!open(PIDFILE, "< $processpidfile")) { 3085: return "error:Open failed for $processpidfile"; 3086: } 3087: my $loncpid = <PIDFILE>; 3088: close(PIDFILE); 3089: logthis(' Reinitializing lonc pid='.$loncpid 3090: .""); 3091: kill("USR2", $loncpid); 3092: } elsif ($process eq 'lond') { 3093: logthis(' Reinitializing self (lond) '); 3094: &UpdateHosts; # Lond is us!! 3095: } else { 3096: &logthis('"); 3098: return "error:Invalid process identifier $process"; 3099: } 3100: return 'ok'; 3101: } 3102: # Validate a line in a configuration file edit script: 3103: # Validation includes: 3104: # - Ensuring the command is valid. 3105: # - Ensuring the command has sufficient parameters 3106: # Parameters: 3107: # scriptline - A line to validate (\n has been stripped for what it's worth). 3108: # 3109: # Return: 3110: # 0 - Invalid scriptline. 3111: # 1 - Valid scriptline 3112: # NOTE: 3113: # Only the command syntax is checked, not the executability of the 3114: # command. 3115: # 3116: sub isValidEditCommand { 3117: my $scriptline = shift; 3118: 3119: # Line elements are pipe separated: 3120: 3121: my ($command, $key, $newline) = split(/\|/, $scriptline); 3122: &logthis(' isValideditCommand checking: '. 3123: "Command = '$command', Key = '$key', Newline = '$newline' \n"); 3124: 3125: if ($command eq "delete") { 3126: # 3127: # key with no newline. 3128: # 3129: if( ($key eq "") || ($newline ne "")) { 3130: return 0; # Must have key but no newline. 3131: } else { 3132: return 1; # Valid syntax. 3133: } 3134: } elsif ($command eq "replace") { 3135: # 3136: # key and newline: 3137: # 3138: if (($key eq "") || ($newline eq "")) { 3139: return 0; 3140: } else { 3141: return 1; 3142: } 3143: } elsif ($command eq "append") { 3144: if (($key ne "") && ($newline eq "")) { 3145: return 1; 3146: } else { 3147: return 0; 3148: } 3149: } else { 3150: return 0; # Invalid command. 3151: } 3152: return 0; # Should not get here!!! 3153: } 3154: # 3155: # ApplyEdit - Applies an edit command to a line in a configuration 3156: # file. It is the caller's responsiblity to validate the 3157: # edit line. 3158: # Parameters: 3159: # $directive - A single edit directive to apply. 3160: # Edit directives are of the form: 3161: # append|newline - Appends a new line to the file. 3162: # replace|key|newline - Replaces the line with key value 'key' 3163: # delete|key - Deletes the line with key value 'key'. 3164: # $editor - A config file editor object that contains the 3165: # file being edited. 3166: # 3167: sub ApplyEdit { 3168: my $directive = shift; 3169: my $editor = shift; 3170: 3171: # Break the directive down into its command and its parameters 3172: # (at most two at this point. The meaning of the parameters, if in fact 3173: # they exist depends on the command). 3174: 3175: my ($command, $p1, $p2) = split(/\|/, $directive); 3176: 3177: if($command eq "append") { 3178: $editor->Append($p1); # p1 - key p2 null. 3179: } elsif ($command eq "replace") { 3180: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline. 3181: } elsif ($command eq "delete") { 3182: $editor->DeleteLine($p1); # p1 - key p2 null. 3183: } else { # Should not get here!!! 3184: die "Invalid command given to ApplyEdit $command"; 3185: } 3186: } 3187: # 3188: # AdjustOurHost: 3189: # Adjusts a host file stored in a configuration file editor object 3190: # for the true IP address of this host. This is necessary for hosts 3191: # that live behind a firewall. 3192: # Those hosts have a publicly distributed IP of the firewall, but 3193: # internally must use their actual IP. We assume that a given 3194: # host only has a single IP interface for now. 3195: # Formal Parameters: 3196: # editor - The configuration file editor to adjust. This 3197: # editor is assumed to contain a hosts.tab file. 3198: # Strategy: 3199: # - Figure out our hostname. 3200: # - Lookup the entry for this host. 3201: # - Modify the line to contain our IP 3202: # - Do a replace for this host. 3203: sub AdjustOurHost { 3204: my $editor = shift; 3205: 3206: # figure out who I am. 3207: 3208: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname. 3209: 3210: # Get my host file entry. 3211: 3212: my $ConfigLine = $editor->Find($myHostName); 3213: if(! (defined $ConfigLine)) { 3214: die "AdjustOurHost - no entry for me in hosts file $myHostName"; 3215: } 3216: # figure out my IP: 3217: # Use the config line to get my hostname. 3218: # Use gethostbyname to translate that into an IP address. 3219: # 3220: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine); 3221: my $BinaryIp = gethostbyname($name); 3222: my $ip = inet_ntoa($ip); 3223: # 3224: # Reassemble the config line from the elements in the list. 3225: # Note that if the loncnew items were not present before, they will 3226: # be now even if they would be empty 3227: # 3228: my $newConfigLine = $id; 3229: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) { 3230: $newConfigLine .= ":".$item; 3231: } 3232: # Replace the line: 3233: 3234: $editor->ReplaceLine($id, $newConfigLine); 3235: 3236: } 3237: # 3238: # ReplaceConfigFile: 3239: # Replaces a configuration file with the contents of a 3240: # configuration file editor object. 3241: # This is done by: 3242: # - Copying the target file to <filename>.old 3243: # - Writing the new file to <filename>.tmp 3244: # - Moving <filename.tmp> -> <filename> 3245: # This laborious process ensures that the system is never without 3246: # a configuration file that's at least valid (even if the contents 3247: # may be dated). 3248: # Parameters: 3249: # filename - Name of the file to modify... this is a full path. 3250: # editor - Editor containing the file. 3251: # 3252: sub ReplaceConfigFile { 3253: my $filename = shift; 3254: my $editor = shift; 3255: 3256: CopyFile ($filename, $filename.".old"); 3257: 3258: my $contents = $editor->Get(); # Get the contents of the file. 3259: 3260: InstallFile($filename, $contents); 3261: } 3262: # 3263: # 3264: # Called to edit a configuration table file 3265: # Parameters: 3266: # request - The entire command/request sent by lonc or lonManage 3267: # Return: 3268: # The reply to send to the client. 3269: # 3270: sub EditFile { 3271: my $request = shift; 3272: 3273: # Split the command into it's pieces: edit:filetype:script 3274: 3275: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script 3276: 3277: # Check the pre-coditions for success: 3278: 3279: if($request != "edit") { # Something is amiss afoot alack. 3280: return "error:edit request detected, but request != 'edit'\n"; 3281: } 3282: if( ($filetype ne "hosts") && 3283: ($filetype ne "domain")) { 3284: return "error:edit requested with invalid file specifier: $filetype \n"; 3285: } 3286: 3287: # Split the edit script and check it's validity. 3288: 3289: my @scriptlines = split(/\n/, $script); # one line per element. 3290: my $linecount = scalar(@scriptlines); 3291: for(my $i = 0; $i < $linecount; $i++) { 3292: chomp($scriptlines[$i]); 3293: if(!isValidEditCommand($scriptlines[$i])) { 3294: return "error:edit with bad script line: '$scriptlines[$i]' \n"; 3295: } 3296: } 3297: 3298: # Execute the edit operation. 3299: # - Create a config file editor for the appropriate file and 3300: # - execute each command in the script: 3301: # 3302: my $configfile = ConfigFileFromSelector($filetype); 3303: if (!(defined $configfile)) { 3304: return "refused\n"; 3305: } 3306: my $editor = ConfigFileEdit->new($configfile); 3307: 3308: for (my $i = 0; $i < $linecount; $i++) { 3309: ApplyEdit($scriptlines[$i], $editor); 3310: } 3311: # If the file is the host file, ensure that our host is 3312: # adjusted to have our ip: 3313: # 3314: if($filetype eq "host") { 3315: AdjustOurHost($editor); 3316: } 3317: # Finally replace the current file with our file. 3318: # 3319: ReplaceConfigFile($configfile, $editor); 3320: 3321: return "ok\n"; 3322: } 3323: # 3324: # Convert an error return code from lcpasswd to a string value. 3325: # 3326: sub lcpasswdstrerror { 3327: my $ErrorCode = shift; 3328: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) { 3329: return "lcpasswd Unrecognized error return value ".$ErrorCode; 3330: } else { 3331: return $passwderrors[$ErrorCode]; 3332: } 3333: } 3334: 3335: # 3336: # Convert an error return code from lcuseradd to a string value: 3337: # 3338: sub lcuseraddstrerror { 3339: my $ErrorCode = shift; 3340: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) { 3341: return "lcuseradd - Unrecognized error code: ".$ErrorCode; 3342: } else { 3343: return $adderrors[$ErrorCode]; 3344: } 3345: } 3346: 3347: # grabs exception and records it to log before exiting 3348: sub catchexception { 3349: my ($error)=@_; 3350: $SIG{'QUIT'}='DEFAULT'; 3351: $SIG{__DIE__}='DEFAULT'; 3352: &status("Catching exception"); 3353: &logthis("CRITICAL: " 3354: ."ABNORMAL EXIT. Child $$ for server $thisserver died through " 3355: ."a crash with this error msg->[$error]"); 3356: &logthis('Famous last words: '.$status.' - '.$lastlog); 3357: if ($client) { print $client "error: $error\n"; } 3358: $server->close(); 3359: die($error); 3360: } 3361: 3362: sub timeout { 3363: &status("Handling Timeout"); 3364: &logthis("CRITICAL: TIME OUT ".$$.""); 3365: &catchexception('Timeout'); 3366: } 3367: # -------------------------------- Set signal handlers to record abnormal exits 3368: 3369: $SIG{'QUIT'}=\&catchexception; 3370: $SIG{__DIE__}=\&catchexception; 3371: 3372: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf 3373: &status("Read loncapa.conf and loncapa_apache.conf"); 3374: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf'); 3375: %perlvar=%{$perlvarref}; 3376: undef $perlvarref; 3377: 3378: # ----------------------------- Make sure this process is running from user=www 3379: my $wwwid=getpwnam('www'); 3380: if ($wwwid!=$<) { 3381: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; 3382: my $subj="LON: $currenthostid User ID mismatch"; 3383: system("echo 'User ID mismatch. lond must be run as user www.' |\ 3384: mailto $emailto -s '$subj' > /dev/null"); 3385: exit 1; 3386: } 3387: 3388: # --------------------------------------------- Check if other instance running 3389: 3390: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid"; 3391: 3392: if (-e $pidfile) { 3393: my $lfh=IO::File->new("$pidfile"); 3394: my $pide=<$lfh>; 3395: chomp($pide); 3396: if (kill 0 => $pide) { die "already running"; } 3397: } 3398: 3399: # ------------------------------------------------------------- Read hosts file 3400: 3401: 3402: 3403: # establish SERVER socket, bind and listen. 3404: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'}, 3405: Type => SOCK_STREAM, 3406: Proto => 'tcp', 3407: Reuse => 1, 3408: Listen => 10 ) 3409: or die "making socket: $@\n"; 3410: 3411: # --------------------------------------------------------- Do global variables 3412: 3413: # global variables 3414: 3415: my %children = (); # keys are current child process IDs 3416: my $children = 0; # current number of children 3417: 3418: sub REAPER { # takes care of dead children 3419: $SIG{CHLD} = \&REAPER; 3420: &status("Handling child death"); 3421: my $pid = wait; 3422: if (defined($children{$pid})) { 3423: &logthis("Child $pid died"); 3424: $children --; 3425: delete $children{$pid}; 3426: } else { 3427: &logthis("Unknown Child $pid died"); 3428: } 3429: &status("Finished Handling child death"); 3430: } 3431: 3432: sub HUNTSMAN { # signal handler for SIGINT 3433: &status("Killing children (INT)"); 3434: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children 3435: kill 'INT' => keys %children; 3436: &logthis("Free socket: ".shutdown($server,2)); # free up socket 3437: my $execdir=$perlvar{'lonDaemons'}; 3438: unlink("$execdir/logs/lond.pid"); 3439: &logthis("CRITICAL: Shutting down"); 3440: &status("Done killing children"); 3441: exit; # clean up with dignity 3442: } 3443: 3444: sub HUPSMAN { # signal handler for SIGHUP 3445: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children 3446: &status("Killing children for restart (HUP)"); 3447: kill 'INT' => keys %children; 3448: &logthis("Free socket: ".shutdown($server,2)); # free up socket 3449: &logthis("CRITICAL: Restarting"); 3450: my $execdir=$perlvar{'lonDaemons'}; 3451: unlink("$execdir/logs/lond.pid"); 3452: &status("Restarting self (HUP)"); 3453: exec("$execdir/lond"); # here we go again 3454: } 3455: 3456: # 3457: # Kill off hashes that describe the host table prior to re-reading it. 3458: # Hashes affected are: 3459: # %hostid, %hostdom %hostip 3460: # 3461: sub KillHostHashes { 3462: foreach my $key (keys %hostid) { 3463: delete $hostid{$key}; 3464: } 3465: foreach my $key (keys %hostdom) { 3466: delete $hostdom{$key}; 3467: } 3468: foreach my $key (keys %hostip) { 3469: delete $hostip{$key}; 3470: } 3471: } 3472: # 3473: # Read in the host table from file and distribute it into the various hashes: 3474: # 3475: # - %hostid - Indexed by IP, the loncapa hostname. 3476: # - %hostdom - Indexed by loncapa hostname, the domain. 3477: # - %hostip - Indexed by hostid, the Ip address of the host. 3478: sub ReadHostTable { 3479: 3480: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file"; 3481: 3482: while (my $configline=<CONFIG>) { 3483: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline); 3484: chomp($ip); $ip=~s/\D+$//; 3485: $hostid{$ip}=$id; 3486: $hostdom{$id}=$domain; 3487: $hostip{$id}=$ip; 3488: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; } 3489: } 3490: close(CONFIG); 3491: } 3492: # 3493: # Reload the Apache daemon's state. 3494: # This is done by invoking /home/httpd/perl/apachereload 3495: # a setuid perl script that can be root for us to do this job. 3496: # 3497: sub ReloadApache { 3498: my $execdir = $perlvar{'lonDaemons'}; 3499: my $script = $execdir."/apachereload"; 3500: system($script); 3501: } 3502: 3503: # 3504: # Called in response to a USR2 signal. 3505: # - Reread hosts.tab 3506: # - All children connected to hosts that were removed from hosts.tab 3507: # are killed via SIGINT 3508: # - All children connected to previously existing hosts are sent SIGUSR1 3509: # - Our internal hosts hash is updated to reflect the new contents of 3510: # hosts.tab causing connections from hosts added to hosts.tab to 3511: # now be honored. 3512: # 3513: sub UpdateHosts { 3514: &status("Reload hosts.tab"); 3515: logthis(' Updating connections '); 3516: # 3517: # The %children hash has the set of IP's we currently have children 3518: # on. These need to be matched against records in the hosts.tab 3519: # Any ip's no longer in the table get killed off they correspond to 3520: # either dropped or changed hosts. Note that the re-read of the table 3521: # will take care of new and changed hosts as connections come into being. 3522: 3523: 3524: KillHostHashes; 3525: ReadHostTable; 3526: 3527: foreach my $child (keys %children) { 3528: my $childip = $children{$child}; 3529: if(!$hostid{$childip}) { 3530: logthis(' UpdateHosts killing child ' 3531: ." $child for ip $childip "); 3532: kill('INT', $child); 3533: } else { 3534: logthis(' keeping child for ip ' 3535: ." $childip (pid=$child) "); 3536: } 3537: } 3538: ReloadApache; 3539: &status("Finished reloading hosts.tab"); 3540: } 3541: 3542: 3543: sub checkchildren { 3544: &status("Checking on the children (sending signals)"); 3545: &initnewstatus(); 3546: &logstatus(); 3547: &logthis('Going to check on the children'); 3548: my $docdir=$perlvar{'lonDocRoot'}; 3549: foreach (sort keys %children) { 3550: sleep 1; 3551: unless (kill 'USR1' => $_) { 3552: &logthis ('Child '.$_.' is dead'); 3553: &logstatus($$.' is dead'); 3554: } 3555: } 3556: sleep 5; 3557: $SIG{ALRM} = sub { die "timeout" }; 3558: $SIG{__DIE__} = 'DEFAULT'; 3559: &status("Checking on the children (waiting for reports)"); 3560: foreach (sort keys %children) { 3561: unless (-e "$docdir/lon-status/londchld/$_.txt") { 3562: eval { 3563: alarm(300); 3564: &logthis('Child '.$_.' did not respond'); 3565: kill 9 => $_; 3566: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; 3567: #$subj="LON: $currenthostid killed lond process $_"; 3568: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`; 3569: #$execdir=$perlvar{'lonDaemons'}; 3570: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`; 3571: alarm(0); 3572: } 3573: } 3574: } 3575: $SIG{ALRM} = 'DEFAULT'; 3576: $SIG{__DIE__} = \&catchexception; 3577: &status("Finished checking children"); 3578: } 3579: 3580: # --------------------------------------------------------------------- Logging 3581: 3582: sub logthis { 3583: my $message=shift; 3584: my $execdir=$perlvar{'lonDaemons'}; 3585: my $fh=IO::File->new(">>$execdir/logs/lond.log"); 3586: my $now=time; 3587: my $local=localtime($now); 3588: $lastlog=$local.': '.$message; 3589: print $fh "$local ($$): $message\n"; 3590: } 3591: 3592: # ------------------------- Conditional log if $DEBUG true. 3593: sub Debug { 3594: my $message = shift; 3595: if($DEBUG) { 3596: &logthis($message); 3597: } 3598: } 3599: 3600: # 3601: # Sub to do replies to client.. this gives a hook for some 3602: # debug tracing too: 3603: # Parameters: 3604: # fd - File open on client. 3605: # reply - Text to send to client. 3606: # request - Original request from client. 3607: # 3608: # Note: This increments Transactions 3609: # 3610: sub Reply { 3611: alarm(120); 3612: my $fd = shift; 3613: my $reply = shift; 3614: my $request = shift; 3615: 3616: print $fd $reply; 3617: Debug("Request was $request Reply was $reply"); 3618: 3619: $Transactions++; 3620: alarm(0); 3621: 3622: 3623: } 3624: # 3625: # Sub to report a failure. 3626: # This function: 3627: # - Increments the failure statistic counters. 3628: # - Invokes Reply to send the error message to the client. 3629: # Parameters: 3630: # fd - File descriptor open on the client 3631: # reply - Reply text to emit. 3632: # request - The original request message (used by Reply 3633: # to debug if that's enabled. 3634: # Implicit outputs: 3635: # $Failures- The number of failures is incremented. 3636: # Reply (invoked here) sends a message to the 3637: # client: 3638: # 3639: sub Failure { 3640: my $fd = shift; 3641: my $reply = shift; 3642: my $request = shift; 3643: 3644: $Failures++; 3645: Reply($fd, $reply, $request); # That's simple eh? 3646: } 3647: # ------------------------------------------------------------------ Log status 3648: 3649: sub logstatus { 3650: &status("Doing logging"); 3651: my $docdir=$perlvar{'lonDocRoot'}; 3652: { 3653: my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt"); 3654: print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n"; 3655: $fh->close(); 3656: } 3657: &status("Finished londstatus.txt"); 3658: { 3659: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt"); 3660: print $fh $status."\n".$lastlog."\n".time; 3661: $fh->close(); 3662: } 3663: ResetStatistics; 3664: &status("Finished logging"); 3665: 3666: } 3667: 3668: sub initnewstatus { 3669: my $docdir=$perlvar{'lonDocRoot'}; 3670: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt"); 3671: my $now=time; 3672: my $local=localtime($now); 3673: print $fh "LOND status $local - parent $$\n\n"; 3674: opendir(DIR,"$docdir/lon-status/londchld"); 3675: while (my $filename=readdir(DIR)) { 3676: unlink("$docdir/lon-status/londchld/$filename"); 3677: } 3678: closedir(DIR); 3679: } 3680: 3681: # -------------------------------------------------------------- Status setting 3682: 3683: sub status { 3684: my $what=shift; 3685: my $now=time; 3686: my $local=localtime($now); 3687: my $status = "lond: $what $local "; 3688: if($Transactions) { 3689: $status .= " Transactions: $Transactions Failed; $Failures"; 3690: } 3691: $0=$status; 3692: } 3693: 3694: # -------------------------------------------------------- Escape Special Chars 3695: 3696: sub escape { 3697: my $str=shift; 3698: $str =~ s/(\W)/"%".unpack('H2',$1)/eg; 3699: return $str; 3700: } 3701: 3702: # ----------------------------------------------------- Un-Escape Special Chars 3703: 3704: sub unescape { 3705: my $str=shift; 3706: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; 3707: return $str; 3708: } 3709: 3710: # ----------------------------------------------------------- Send USR1 to lonc 3711: 3712: sub reconlonc { 3713: my $peerfile=shift; 3714: &logthis("Trying to reconnect for $peerfile"); 3715: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid"; 3716: if (my $fh=IO::File->new("$loncfile")) { 3717: my $loncpid=<$fh>; 3718: chomp($loncpid); 3719: if (kill 0 => $loncpid) { 3720: &logthis("lonc at pid $loncpid responding, sending USR1"); 3721: kill USR1 => $loncpid; 3722: } else { 3723: &logthis("CRITICAL: " 3724: ."lonc at pid $loncpid not responding, giving up"); 3725: } 3726: } else { 3727: &logthis('CRITICAL: lonc not running, giving up'); 3728: } 3729: } 3730: 3731: # -------------------------------------------------- Non-critical communication 3732: 3733: sub subreply { 3734: my ($cmd,$server)=@_; 3735: my $peerfile="$perlvar{'lonSockDir'}/$server"; 3736: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", 3737: Type => SOCK_STREAM, 3738: Timeout => 10) 3739: or return "con_lost"; 3740: print $sclient "$cmd\n"; 3741: my $answer=<$sclient>; 3742: chomp($answer); 3743: if (!$answer) { $answer="con_lost"; } 3744: return $answer; 3745: } 3746: 3747: sub reply { 3748: my ($cmd,$server)=@_; 3749: my $answer; 3750: if ($server ne $currenthostid) { 3751: $answer=subreply($cmd,$server); 3752: if ($answer eq 'con_lost') { 3753: $answer=subreply("ping",$server); 3754: if ($answer ne $server) { 3755: &logthis("sub reply: answer != server answer is $answer, server is $server"); 3756: &reconlonc("$perlvar{'lonSockDir'}/$server"); 3757: } 3758: $answer=subreply($cmd,$server); 3759: } 3760: } else { 3761: $answer='self_reply'; 3762: } 3763: return $answer; 3764: } 3765: 3766: # -------------------------------------------------------------- Talk to lonsql 3767: 3768: sub sqlreply { 3769: my ($cmd)=@_; 3770: my $answer=subsqlreply($cmd); 3771: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); } 3772: return $answer; 3773: } 3774: 3775: sub subsqlreply { 3776: my ($cmd)=@_; 3777: my $unixsock="mysqlsock"; 3778: my $peerfile="$perlvar{'lonSockDir'}/$unixsock"; 3779: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", 3780: Type => SOCK_STREAM, 3781: Timeout => 10) 3782: or return "con_lost"; 3783: print $sclient "$cmd\n"; 3784: my $answer=<$sclient>; 3785: chomp($answer); 3786: if (!$answer) { $answer="con_lost"; } 3787: return $answer; 3788: } 3789: 3790: # -------------------------------------------- Return path to profile directory 3791: 3792: sub propath { 3793: my ($udom,$uname)=@_; 3794: Debug("Propath:$udom:$uname"); 3795: $udom=~s/\W//g; 3796: $uname=~s/\W//g; 3797: Debug("Propath2:$udom:$uname"); 3798: my $subdir=$uname.'__'; 3799: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/; 3800: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname"; 3801: Debug("Propath returning $proname"); 3802: return $proname; 3803: } 3804: 3805: # --------------------------------------- Is this the home server of an author? 3806: 3807: sub ishome { 3808: my $author=shift; 3809: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/; 3810: my ($udom,$uname)=split(/\//,$author); 3811: my $proname=propath($udom,$uname); 3812: if (-e $proname) { 3813: return 'owner'; 3814: } else { 3815: return 'not_owner'; 3816: } 3817: } 3818: 3819: # ======================================================= Continue main program 3820: # ---------------------------------------------------- Fork once and dissociate 3821: 3822: my $fpid=fork; 3823: exit if $fpid; 3824: die "Couldn't fork: $!" unless defined ($fpid); 3825: 3826: POSIX::setsid() or die "Can't start new session: $!"; 3827: 3828: # ------------------------------------------------------- Write our PID on disk 3829: 3830: my $execdir=$perlvar{'lonDaemons'}; 3831: open (PIDSAVE,">$execdir/logs/lond.pid"); 3832: print PIDSAVE "$$\n"; 3833: close(PIDSAVE); 3834: &logthis("CRITICAL: ---------- Starting ----------"); 3835: &status('Starting'); 3836: 3837: 3838: 3839: # ----------------------------------------------------- Install signal handlers 3840: 3841: 3842: $SIG{CHLD} = \&REAPER; 3843: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN; 3844: $SIG{HUP} = \&HUPSMAN; 3845: $SIG{USR1} = \&checkchildren; 3846: $SIG{USR2} = \&UpdateHosts; 3847: 3848: # Read the host hashes: 3849: 3850: ReadHostTable; 3851: 3852: 3853: # -------------------------------------------------------------- 3854: # Accept connections. When a connection comes in, it is validated 3855: # and if good, a child process is created to process transactions 3856: # along the connection. 3857: 3858: while (1) { 3859: &status('Starting accept'); 3860: $client = $server->accept() or next; 3861: &status('Accepted '.$client.' off to spawn'); 3862: make_new_child($client); 3863: &status('Finished spawning'); 3864: } 3865: 3866: sub make_new_child { 3867: my $pid; 3868: my $sigset; 3869: 3870: $client = shift; 3871: &status('Starting new child '.$client); 3872: &logthis(' Attempting to start child ('.$client. 3873: ")"); 3874: # block signal for fork 3875: $sigset = POSIX::SigSet->new(SIGINT); 3876: sigprocmask(SIG_BLOCK, $sigset) 3877: or die "Can't block SIGINT for fork: $!\n"; 3878: 3879: die "fork: $!" unless defined ($pid = fork); 3880: 3881: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of 3882: # connection liveness. 3883: 3884: # 3885: # Figure out who we're talking to so we can record the peer in 3886: # the pid hash. 3887: # 3888: my $caller = getpeername($client); 3889: my ($port,$iaddr)=unpack_sockaddr_in($caller); 3890: $clientip=inet_ntoa($iaddr); 3891: 3892: if ($pid) { 3893: # Parent records the child's birth and returns. 3894: sigprocmask(SIG_UNBLOCK, $sigset) 3895: or die "Can't unblock SIGINT for fork: $!\n"; 3896: $children{$pid} = $clientip; 3897: $children++; 3898: &status('Started child '.$pid); 3899: return; 3900: } else { 3901: # Child can *not* return from this subroutine. 3902: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before 3903: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 3904: #don't get intercepted 3905: $SIG{USR1}= \&logstatus; 3906: $SIG{ALRM}= \&timeout; 3907: $lastlog='Forked '; 3908: $status='Forked'; 3909: 3910: # unblock signals 3911: sigprocmask(SIG_UNBLOCK, $sigset) 3912: or die "Can't unblock SIGINT for fork: $!\n"; 3913: 3914: 3915: 3916: &Authen::Krb5::init_context(); 3917: &Authen::Krb5::init_ets(); 3918: 3919: &status('Accepted connection'); 3920: # ============================================================================= 3921: # do something with the connection 3922: # ----------------------------------------------------------------------------- 3923: # see if we know client and check for spoof IP by challenge 3924: 3925: ReadManagerTable; # May also be a manager!! 3926: 3927: my $clientrec=($hostid{$clientip} ne undef); 3928: my $ismanager=($managers{$clientip} ne undef); 3929: $clientname = "[unknonwn]"; 3930: if($clientrec) { # Establish client type. 3931: $ConnectionType = "client"; 3932: $clientname = $hostid{$clientip}; 3933: if($ismanager) { 3934: $ConnectionType = "both"; 3935: } 3936: } else { 3937: $ConnectionType = "manager"; 3938: $clientname = $managers{$clientip}; 3939: } 3940: my $clientok; 3941: if ($clientrec || $ismanager) { 3942: &status("Waiting for init from $clientip $clientname"); 3943: &logthis('INFO: Connection, '. 3944: $clientip. 3945: " ($clientname) connection type = $ConnectionType " ); 3946: &status("Connecting $clientip ($clientname))"); 3947: my $remotereq=<$client>; 3948: $remotereq=~s/[^\w:]//g; 3949: if ($remotereq =~ /^init/) { 3950: &sethost("sethost:$perlvar{'lonHostID'}"); 3951: my $challenge="$$".time; 3952: print $client "$challenge\n"; 3953: &status("Waiting for challenge reply from $clientip ($clientname)"); 3954: $remotereq=<$client>; 3955: $remotereq=~s/\W//g; 3956: if ($challenge eq $remotereq) { 3957: $clientok=1; 3958: print $client "ok\n"; 3959: } else { 3960: &logthis("WARNING: $clientip did not reply challenge"); 3961: &status('No challenge reply '.$clientip); 3962: } 3963: } else { 3964: &logthis("WARNING: " 3965: ."$clientip failed to initialize: >$remotereq< "); 3966: &status('No init '.$clientip); 3967: } 3968: } else { 3969: &logthis("WARNING: Unknown client $clientip"); 3970: &status('Hung up on '.$clientip); 3971: } 3972: if ($clientok) { 3973: # ---------------- New known client connecting, could mean machine online again 3974: 3975: foreach my $id (keys(%hostip)) { 3976: if ($hostip{$id} ne $clientip || 3977: $hostip{$currenthostid} eq $clientip) { 3978: # no need to try to do recon's to myself 3979: next; 3980: } 3981: &reconlonc("$perlvar{'lonSockDir'}/$id"); 3982: } 3983: &logthis("Established connection: $clientname"); 3984: &status('Will listen to '.$clientname); 3985: 3986: ResetStatistics(); 3987: 3988: # ------------------------------------------------------------ Process requests 3989: my $KeepGoing = 1; 3990: while ((my $userinput=GetRequest) && $KeepGoing) { 3991: $KeepGoing = ProcessRequest($userinput); 3992: # -------------------------------------------------------------------- complete 3993: 3994: &status('Listening to '.$clientname); 3995: } 3996: # --------------------------------------------- client unknown or fishy, refuse 3997: } else { 3998: print $client "refused\n"; 3999: $client->close(); 4000: &logthis("WARNING: " 4001: ."Rejected client $clientip, closing connection"); 4002: } 4003: } 4004: 4005: # ============================================================================= 4006: 4007: &logthis("CRITICAL: " 4008: ."Disconnect from $clientip ($clientname)"); 4009: 4010: 4011: # this exit is VERY important, otherwise the child will become 4012: # a producer of more and more children, forking yourself into 4013: # process death. 4014: exit; 4015: 4016: } 4017: 4018: 4019: # 4020: # Checks to see if the input roleput request was to set 4021: # an author role. If so, invokes the lchtmldir script to set 4022: # up a correct public_html 4023: # Parameters: 4024: # request - The request sent to the rolesput subchunk. 4025: # We're looking for /domain/_au 4026: # domain - The domain in which the user is having roles doctored. 4027: # user - Name of the user for which the role is being put. 4028: # authtype - The authentication type associated with the user. 4029: # 4030: sub ManagePermissions { 4031: my $request = shift; 4032: my $domain = shift; 4033: my $user = shift; 4034: my $authtype= shift; 4035: 4036: # See if the request is of the form /$domain/_au 4037: &logthis("ruequest is $request"); 4038: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput... 4039: my $execdir = $perlvar{'lonDaemons'}; 4040: my $userhome= "/home/$user" ; 4041: &logthis("system $execdir/lchtmldir $userhome $user $authtype"); 4042: system("$execdir/lchtmldir $userhome $user $authtype"); 4043: } 4044: } 4045: 4046: # 4047: # Return the full path of a user password file, whether it exists or not. 4048: # Parameters: 4049: # domain - Domain in which the password file lives. 4050: # user - name of the user. 4051: # Returns: 4052: # Full passwd path: 4053: # 4054: sub PasswordPath { 4055: my $domain = shift; 4056: my $user = shift; 4057: 4058: my $path = &propath($domain, $user); 4059: $path .= "/passwd"; 4060: 4061: return $path; 4062: } 4063: 4064: # Password Filename 4065: # Returns the path to a passwd file given domain and user... only if 4066: # it exists. 4067: # Parameters: 4068: # domain - Domain in which to search. 4069: # user - username. 4070: # Returns: 4071: # - If the password file exists returns its path. 4072: # - If the password file does not exist, returns undefined. 4073: # 4074: sub PasswordFilename { 4075: my $domain = shift; 4076: my $user = shift; 4077: 4078: Debug ("PasswordFilename called: dom = $domain user = $user"); 4079: 4080: my $path = PasswordPath($domain, $user); 4081: Debug("PasswordFilename got path: $path"); 4082: if(-e $path) { 4083: return $path; 4084: } else { 4085: return undef; 4086: } 4087: } 4088: 4089: # 4090: # Rewrite the contents of the user's passwd file. 4091: # Parameters: 4092: # domain - domain of the user. 4093: # name - User's name. 4094: # contents - New contents of the file. 4095: # Returns: 4096: # 0 - Failed. 4097: # 1 - Success. 4098: # 4099: sub RewritePwFile { 4100: my $domain = shift; 4101: my $user = shift; 4102: my $contents = shift; 4103: 4104: my $file = PasswordFilename($domain, $user); 4105: if (defined $file) { 4106: my $pf = IO::File->new(">$file"); 4107: if($pf) { 4108: print $pf "$contents\n"; 4109: return 1; 4110: } else { 4111: return 0; 4112: } 4113: } else { 4114: return 0; 4115: } 4116: 4117: } 4118: # 4119: # GetAuthType - Determines the authorization type of a user in a domain. 4120: 4121: # Returns the authorization type or nouser if there is no such user. 4122: # 4123: sub GetAuthType { 4124: my $domain = shift; 4125: my $user = shift; 4126: 4127: Debug("GetAuthType( $domain, $user ) \n"); 4128: my $passwdfile = PasswordFilename($domain, $user); 4129: if( defined $passwdfile ) { 4130: my $pf = IO::File->new($passwdfile); 4131: my $realpassword = <$pf>; 4132: chomp($realpassword); 4133: Debug("Password info = $realpassword\n"); 4134: return $realpassword; 4135: } else { 4136: Debug("Returning nouser"); 4137: return "nouser"; 4138: } 4139: } 4140: 4141: # 4142: # Validate a user given their domain, name and password. This utility 4143: # function is used by both AuthenticateHandler and ChangePasswordHandler 4144: # to validate the login credentials of a user. 4145: # Parameters: 4146: # $domain - The domain being logged into (this is required due to 4147: # the capability for multihomed systems. 4148: # $user - The name of the user being validated. 4149: # $password - The user's propoposed password. 4150: # 4151: # Returns: 4152: # 1 - The domain,user,pasword triplet corresponds to a valid 4153: # user. 4154: # 0 - The domain,user,password triplet is not a valid user. 4155: # 4156: sub ValidateUser { 4157: my $domain = shift; 4158: my $user = shift; 4159: my $password= shift; 4160: 4161: # Why negative ~pi you may well ask? Well this function is about 4162: # authentication, and therefore very important to get right. 4163: # I've initialized the flag that determines whether or not I've 4164: # validated correctly to a value it's not supposed to get. 4165: # At the end of this function. I'll ensure that it's not still that 4166: # value so we don't just wind up returning some accidental value 4167: # as a result of executing an unforseen code path that 4168: # did not set $validated. 4169: 4170: my $validated = -3.14159; 4171: 4172: # How we authenticate is determined by the type of authentication 4173: # the user has been assigned. If the authentication type is 4174: # "nouser", the user does not exist so we will return 0. 4175: 4176: my $contents = GetAuthType($domain, $user); 4177: my ($howpwd, $contentpwd) = split(/:/, $contents); 4178: 4179: my $null = pack("C",0); # Used by kerberos auth types. 4180: 4181: if ($howpwd ne 'nouser') { 4182: 4183: if($howpwd eq "internal") { # Encrypted is in local password file. 4184: $validated = (crypt($password, $contentpwd) eq $contentpwd); 4185: } 4186: elsif ($howpwd eq "unix") { # User is a normal unix user. 4187: $contentpwd = (getpwnam($user))[1]; 4188: if($contentpwd) { 4189: if($contentpwd eq 'x') { # Shadow password file... 4190: my $pwauth_path = "/usr/local/sbin/pwauth"; 4191: open PWAUTH, "|$pwauth_path" or 4192: die "Cannot invoke authentication"; 4193: print PWAUTH "$user\n$password\n"; 4194: close PWAUTH; 4195: $validated = ! $?; 4196: 4197: } else { # Passwords in /etc/passwd. 4198: $validated = (crypt($password, 4199: $contentpwd) eq $contentpwd); 4200: } 4201: } else { 4202: $validated = 0; 4203: } 4204: } 4205: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain. 4206: if(! ($password =~ /$null/) ) { 4207: my $k4error = &Authen::Krb4::get_pw_in_tkt($user, 4208: "", 4209: $contentpwd,, 4210: 'krbtgt', 4211: $contentpwd, 4212: 1, 4213: $password); 4214: if(!$k4error) { 4215: $validated = 1; 4216: } 4217: else { 4218: $validated = 0; 4219: &logthis('krb4: '.$user.', '.$contentpwd.', '. 4220: &Authen::Krb4::get_err_txt($Authen::Krb4::error)); 4221: } 4222: } 4223: else { 4224: $validated = 0; # Password has a match with null. 4225: } 4226: } 4227: elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain. 4228: if(!($password =~ /$null/)) { # Null password not allowed. 4229: my $krbclient = &Authen::Krb5::parse_name($user.'@' 4230: .$contentpwd); 4231: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd; 4232: my $krbserver = &Authen::Krb5::parse_name($krbservice); 4233: my $credentials= &Authen::Krb5::cc_default(); 4234: $credentials->initialize($krbclient); 4235: my $krbreturn = &Authen::KRb5::get_in_tkt_with_password($krbclient, 4236: $krbserver, 4237: $password, 4238: $credentials); 4239: $validated = ($krbreturn == 1); 4240: } 4241: else { 4242: $validated = 0; 4243: } 4244: } 4245: elsif ($howpwd eq "localauth") { 4246: # Authenticate via installation specific authentcation method: 4247: $validated = &localauth::localauth($user, 4248: $password, 4249: $contentpwd); 4250: } 4251: else { # Unrecognized auth is also bad. 4252: $validated = 0; 4253: } 4254: } else { 4255: $validated = 0; 4256: } 4257: # 4258: # $validated has the correct stat of the authentication: 4259: # 4260: 4261: unless ($validated != -3.14159) { 4262: die "ValidateUser - failed to set the value of validated"; 4263: } 4264: return $validated; 4265: } 4266: 4267: # 4268: # Add a line to the subscription list? 4269: # 4270: sub addline { 4271: my ($fname,$hostid,$ip,$newline)=@_; 4272: my $contents; 4273: my $found=0; 4274: my $expr='^'.$hostid.':'.$ip.':'; 4275: $expr =~ s/\./\\\./g; 4276: my $sh; 4277: if ($sh=IO::File->new("$fname.subscription")) { 4278: while (my $subline=<$sh>) { 4279: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;} 4280: } 4281: $sh->close(); 4282: } 4283: $sh=IO::File->new(">$fname.subscription"); 4284: if ($contents) { print $sh $contents; } 4285: if ($newline) { print $sh $newline; } 4286: $sh->close(); 4287: return $found; 4288: } 4289: # 4290: # Get chat messages. 4291: # 4292: sub getchat { 4293: my ($cdom,$cname,$udom,$uname)=@_; 4294: my %hash; 4295: my $proname=&propath($cdom,$cname); 4296: my @entries=(); 4297: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db", 4298: &GDBM_READER(),0640)) { 4299: @entries=map { $_.':'.$hash{$_} } sort keys %hash; 4300: untie %hash; 4301: } 4302: my @participants=(); 4303: my $cutoff=time-60; 4304: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db", 4305: &GDBM_WRCREAT(),0640)) { 4306: $hash{$uname.':'.$udom}=time; 4307: foreach (sort keys %hash) { 4308: if ($hash{$_}>$cutoff) { 4309: $participants[$#participants+1]='active_participant:'.$_; 4310: } 4311: } 4312: untie %hash; 4313: } 4314: return (@participants,@entries); 4315: } 4316: # 4317: # Add a chat message 4318: # 4319: sub chatadd { 4320: my ($cdom,$cname,$newchat)=@_; 4321: my %hash; 4322: my $proname=&propath($cdom,$cname); 4323: my @entries=(); 4324: my $time=time; 4325: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db", 4326: &GDBM_WRCREAT(),0640)) { 4327: @entries=map { $_.':'.$hash{$_} } sort keys %hash; 4328: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/); 4329: my ($thentime,$idnum)=split(/\_/,$lastid); 4330: my $newid=$time.'_000000'; 4331: if ($thentime==$time) { 4332: $idnum=~s/^0+//; 4333: $idnum++; 4334: $idnum=substr('000000'.$idnum,-6,6); 4335: $newid=$time.'_'.$idnum; 4336: } 4337: $hash{$newid}=$newchat; 4338: my $expired=$time-3600; 4339: foreach (keys %hash) { 4340: my ($thistime)=($_=~/(\d+)\_/); 4341: if ($thistime<$expired) { 4342: delete $hash{$_}; 4343: } 4344: } 4345: untie %hash; 4346: } 4347: { 4348: my $hfh; 4349: if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 4350: print $hfh "$time:".&unescape($newchat)."\n"; 4351: } 4352: } 4353: } 4354: 4355: sub unsub { 4356: my ($fname,$clientip)=@_; 4357: my $result; 4358: if (unlink("$fname.$clientname")) { 4359: $result="ok\n"; 4360: } else { 4361: $result="not_subscribed\n"; 4362: } 4363: if (-e "$fname.subscription") { 4364: my $found=&addline($fname,$clientname,$clientip,''); 4365: if ($found) { $result="ok\n"; } 4366: } else { 4367: if ($result != "ok\n") { $result="not_subscribed\n"; } 4368: } 4369: return $result; 4370: } 4371: 4372: sub currentversion { 4373: my $fname=shift; 4374: my $version=-1; 4375: my $ulsdir=''; 4376: if ($fname=~/^(.+)\/[^\/]+$/) { 4377: $ulsdir=$1; 4378: } 4379: my ($fnamere1,$fnamere2); 4380: # remove version if already specified 4381: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/; 4382: # get the bits that go before and after the version number 4383: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) { 4384: $fnamere1=$1; 4385: $fnamere2='.'.$2; 4386: } 4387: if (-e $fname) { $version=1; } 4388: if (-e $ulsdir) { 4389: if(-d $ulsdir) { 4390: if (opendir(LSDIR,$ulsdir)) { 4391: my $ulsfn; 4392: while ($ulsfn=readdir(LSDIR)) { 4393: # see if this is a regular file (ignore links produced earlier) 4394: my $thisfile=$ulsdir.'/'.$ulsfn; 4395: unless (-l $thisfile) { 4396: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) { 4397: if ($1>$version) { $version=$1; } 4398: } 4399: } 4400: } 4401: closedir(LSDIR); 4402: $version++; 4403: } 4404: } 4405: } 4406: return $version; 4407: } 4408: 4409: sub thisversion { 4410: my $fname=shift; 4411: my $version=-1; 4412: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) { 4413: $version=$1; 4414: } 4415: return $version; 4416: } 4417: 4418: sub subscribe { 4419: my ($userinput,$clientip)=@_; 4420: my $result; 4421: my ($cmd,$fname)=split(/:/,$userinput); 4422: my $ownership=&ishome($fname); 4423: if ($ownership eq 'owner') { 4424: # explitly asking for the current version? 4425: unless (-e $fname) { 4426: my $currentversion=&currentversion($fname); 4427: if (&thisversion($fname)==$currentversion) { 4428: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) { 4429: my $root=$1; 4430: my $extension=$2; 4431: symlink($root.'.'.$extension, 4432: $root.'.'.$currentversion.'.'.$extension); 4433: unless ($extension=~/\.meta$/) { 4434: symlink($root.'.'.$extension.'.meta', 4435: $root.'.'.$currentversion.'.'.$extension.'.meta'); 4436: } 4437: } 4438: } 4439: } 4440: if (-e $fname) { 4441: if (-d $fname) { 4442: $result="directory\n"; 4443: } else { 4444: if (-e "$fname.$clientname") {&unsub($fname,$clientip);} 4445: my $now=time; 4446: my $found=&addline($fname,$clientname,$clientip, 4447: "$clientname:$clientip:$now\n"); 4448: if ($found) { $result="$fname\n"; } 4449: # if they were subscribed to only meta data, delete that 4450: # subscription, when you subscribe to a file you also get 4451: # the metadata 4452: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); } 4453: $fname=~s/\/home\/httpd\/html\/res/raw/; 4454: $fname="http://$thisserver/".$fname; 4455: $result="$fname\n"; 4456: } 4457: } else { 4458: $result="not_found\n"; 4459: } 4460: } else { 4461: $result="rejected\n"; 4462: } 4463: return $result; 4464: } 4465: 4466: sub make_passwd_file { 4467: my ($uname, $umode,$npass,$passfilename)=@_; 4468: my $result="ok\n"; 4469: if ($umode eq 'krb4' or $umode eq 'krb5') { 4470: { 4471: my $pf = IO::File->new(">$passfilename"); 4472: print $pf "$umode:$npass\n"; 4473: } 4474: } elsif ($umode eq 'internal') { 4475: my $salt=time; 4476: $salt=substr($salt,6,2); 4477: my $ncpass=crypt($npass,$salt); 4478: { 4479: &Debug("Creating internal auth"); 4480: my $pf = IO::File->new(">$passfilename"); 4481: print $pf "internal:$ncpass\n"; 4482: } 4483: } elsif ($umode eq 'localauth') { 4484: { 4485: my $pf = IO::File->new(">$passfilename"); 4486: print $pf "localauth:$npass\n"; 4487: } 4488: } elsif ($umode eq 'unix') { 4489: # 4490: # Don't allow the creation of privileged accounts!!! that would 4491: # be real bad!!! 4492: # 4493: my $uid = getpwnam($uname); 4494: if((defined $uid) && ($uid == 0)) { 4495: &logthis(">>>Attempted add of privileged account blocked<<<"); 4496: return "no_priv_account_error\n"; 4497: } 4498: 4499: # 4500: my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd"; 4501: 4502: &Debug("Executing external: ".$execpath); 4503: &Debug("user = ".$uname.", Password =". $npass); 4504: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log"); 4505: print $se "$uname\n"; 4506: print $se "$npass\n"; 4507: print $se "$npass\n"; 4508: 4509: my $useraddok = $?; 4510: if($useraddok > 0) { 4511: my $lcstring = lcuseraddstrerror($useraddok); 4512: &logthis("Failed lcuseradd: $lcstring"); 4513: return "error: lcuseradd failed: $lcstring\n"; 4514: } 4515: my $pf = IO::File->new(">$passfilename"); 4516: print $pf "unix:\n"; 4517: 4518: } elsif ($umode eq 'none') { 4519: { 4520: my $pf = IO::File->new(">$passfilename"); 4521: print $pf "none:\n"; 4522: } 4523: } else { 4524: $result="auth_mode_error\n"; 4525: } 4526: return $result; 4527: } 4528: 4529: sub sethost { 4530: my ($remotereq) = @_; 4531: my (undef,$hostid)=split(/:/,$remotereq); 4532: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; } 4533: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) { 4534: $currenthostid=$hostid; 4535: $currentdomainid=$hostdom{$hostid}; 4536: &logthis("Setting hostid to $hostid, and domain to $currentdomainid"); 4537: } else { 4538: &logthis("Requested host id $hostid not an alias of ". 4539: $perlvar{'lonHostID'}." refusing connection"); 4540: return 'unable_to_set'; 4541: } 4542: return 'ok'; 4543: } 4544: 4545: sub version { 4546: my ($userinput)=@_; 4547: $remoteVERSION=(split(/:/,$userinput))[1]; 4548: return "version:$VERSION"; 4549: } 4550: ############## >>>>>>>>>>>>>>>>>>>>>>>>>> FUTUREWORK <<<<<<<<<<<<<<<<<<<<<<<<<<<< 4551: #There is a copy of this in lonnet.pm 4552: # Can we hoist these lil' things out into common places? 4553: # 4554: sub userload { 4555: my $numusers=0; 4556: { 4557: opendir(LONIDS,$perlvar{'lonIDsDir'}); 4558: my $filename; 4559: my $curtime=time; 4560: while ($filename=readdir(LONIDS)) { 4561: if ($filename eq '.' || $filename eq '..') {next;} 4562: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9]; 4563: if ($curtime-$mtime < 1800) { $numusers++; } 4564: } 4565: closedir(LONIDS); 4566: } 4567: my $userloadpercent=0; 4568: my $maxuserload=$perlvar{'lonUserLoadLim'}; 4569: if ($maxuserload) { 4570: $userloadpercent=100*$numusers/$maxuserload; 4571: } 4572: $userloadpercent=sprintf("%.2f",$userloadpercent); 4573: return $userloadpercent; 4574: } 4575: 4576: # ----------------------------------- POD (plain old documentation, CPAN style) 4577: 4578: =head1 NAME 4579: 4580: lond - "LON Daemon" Server (port "LOND" 5663) 4581: 4582: =head1 SYNOPSIS 4583: 4584: Usage: B<lond> 4585: 4586: Should only be run as user=www. This is a command-line script which 4587: is invoked by B<loncron>. There is no expectation that a typical user 4588: will manually start B<lond> from the command-line. (In other words, 4589: DO NOT START B<lond> YOURSELF.) 4590: 4591: =head1 DESCRIPTION 4592: 4593: There are two characteristics associated with the running of B<lond>, 4594: PROCESS MANAGEMENT (starting, stopping, handling child processes) 4595: and SERVER-SIDE ACTIVITIES (password authentication, user creation, 4596: subscriptions, etc). These are described in two large 4597: sections below. 4598: 4599: B<PROCESS MANAGEMENT> 4600: 4601: Preforker - server who forks first. Runs as a daemon. HUPs. 4602: Uses IDEA encryption 4603: 4604: B<lond> forks off children processes that correspond to the other servers 4605: in the network. Management of these processes can be done at the 4606: parent process level or the child process level. 4607: 4608: B<logs/lond.log> is the location of log messages. 4609: 4610: The process management is now explained in terms of linux shell commands, 4611: subroutines internal to this code, and signal assignments: 4612: 4613: =over 4 4614: 4615: =item * 4616: 4617: PID is stored in B<logs/lond.pid> 4618: 4619: This is the process id number of the parent B<lond> process. 4620: 4621: =item * 4622: 4623: SIGTERM and SIGINT 4624: 4625: Parent signal assignment: 4626: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN; 4627: 4628: Child signal assignment: 4629: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also) 4630: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber 4631: to restart a new child.) 4632: 4633: Command-line invocations: 4634: B<kill> B<-s> SIGTERM I<PID> 4635: B<kill> B<-s> SIGINT I<PID> 4636: 4637: Subroutine B<HUNTSMAN>: 4638: This is only invoked for the B<lond> parent I<PID>. 4639: This kills all the children, and then the parent. 4640: The B<lonc.pid> file is cleared. 4641: 4642: =item * 4643: 4644: SIGHUP 4645: 4646: Current bug: 4647: This signal can only be processed the first time 4648: on the parent process. Subsequent SIGHUP signals 4649: have no effect. 4650: 4651: Parent signal assignment: 4652: $SIG{HUP} = \&HUPSMAN; 4653: 4654: Child signal assignment: 4655: none (nothing happens) 4656: 4657: Command-line invocations: 4658: B<kill> B<-s> SIGHUP I<PID> 4659: 4660: Subroutine B<HUPSMAN>: 4661: This is only invoked for the B<lond> parent I<PID>, 4662: This kills all the children, and then the parent. 4663: The B<lond.pid> file is cleared. 4664: 4665: =item * 4666: 4667: SIGUSR1 4668: 4669: Parent signal assignment: 4670: $SIG{USR1} = \&USRMAN; 4671: 4672: Child signal assignment: 4673: $SIG{USR1}= \&logstatus; 4674: 4675: Command-line invocations: 4676: B<kill> B<-s> SIGUSR1 I<PID> 4677: 4678: Subroutine B<USRMAN>: 4679: When invoked for the B<lond> parent I<PID>, 4680: SIGUSR1 is sent to all the children, and the status of 4681: each connection is logged. 4682: 4683: =item * 4684: 4685: SIGUSR2 4686: 4687: Parent Signal assignment: 4688: $SIG{USR2} = \&UpdateHosts 4689: 4690: Child signal assignment: 4691: NONE 4692: 4693: 4694: =item * 4695: 4696: SIGCHLD 4697: 4698: Parent signal assignment: 4699: $SIG{CHLD} = \&REAPER; 4700: 4701: Child signal assignment: 4702: none 4703: 4704: Command-line invocations: 4705: B<kill> B<-s> SIGCHLD I<PID> 4706: 4707: Subroutine B<REAPER>: 4708: This is only invoked for the B<lond> parent I<PID>. 4709: Information pertaining to the child is removed. 4710: The socket port is cleaned up. 4711: 4712: =back 4713: 4714: B<SERVER-SIDE ACTIVITIES> 4715: 4716: Server-side information can be accepted in an encrypted or non-encrypted 4717: method. 4718: 4719: =over 4 4720: 4721: =item ping 4722: 4723: Query a client in the hosts.tab table; "Are you there?" 4724: 4725: =item pong 4726: 4727: Respond to a ping query. 4728: 4729: =item ekey 4730: 4731: Read in encrypted key, make cipher. Respond with a buildkey. 4732: 4733: =item load 4734: 4735: Respond with CPU load based on a computation upon /proc/loadavg. 4736: 4737: =item currentauth 4738: 4739: Reply with current authentication information (only over an 4740: encrypted channel). 4741: 4742: =item auth 4743: 4744: Only over an encrypted channel, reply as to whether a user's 4745: authentication information can be validated. 4746: 4747: =item passwd 4748: 4749: Allow for a password to be set. 4750: 4751: =item makeuser 4752: 4753: Make a user. 4754: 4755: =item passwd 4756: 4757: Allow for authentication mechanism and password to be changed. 4758: 4759: =item home 4760: 4761: Respond to a question "are you the home for a given user?" 4762: 4763: =item update 4764: 4765: Update contents of a subscribed resource. 4766: 4767: =item unsubscribe 4768: 4769: The server is unsubscribing from a resource. 4770: 4771: =item subscribe 4772: 4773: The server is subscribing to a resource. 4774: 4775: =item log 4776: 4777: Place in B<logs/lond.log> 4778: 4779: =item put 4780: 4781: stores hash in namespace 4782: 4783: =item rolesput 4784: 4785: put a role into a user's environment 4786: 4787: =item get 4788: 4789: returns hash with keys from array 4790: reference filled in from namespace 4791: 4792: =item eget 4793: 4794: returns hash with keys from array 4795: reference filled in from namesp (encrypts the return communication) 4796: 4797: =item rolesget 4798: 4799: get a role from a user's environment 4800: 4801: =item del 4802: 4803: deletes keys out of array from namespace 4804: 4805: =item keys 4806: 4807: returns namespace keys 4808: 4809: =item dump 4810: 4811: dumps the complete (or key matching regexp) namespace into a hash 4812: 4813: =item store 4814: 4815: stores hash permanently 4816: for this url; hashref needs to be given and should be a \%hashname; the 4817: remaining args aren't required and if they aren't passed or are '' they will 4818: be derived from the ENV 4819: 4820: =item restore 4821: 4822: returns a hash for a given url 4823: 4824: =item querysend 4825: 4826: Tells client about the lonsql process that has been launched in response 4827: to a sent query. 4828: 4829: =item queryreply 4830: 4831: Accept information from lonsql and make appropriate storage in temporary 4832: file space. 4833: 4834: =item idput 4835: 4836: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers 4837: for each student, defined perhaps by the institutional Registrar.) 4838: 4839: =item idget 4840: 4841: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers 4842: for each student, defined perhaps by the institutional Registrar.) 4843: 4844: =item tmpput 4845: 4846: Accept and store information in temporary space. 4847: 4848: =item tmpget 4849: 4850: Send along temporarily stored information. 4851: 4852: =item ls 4853: 4854: List part of a user's directory. 4855: 4856: =item pushtable 4857: 4858: Pushes a file in /home/httpd/lonTab directory. Currently limited to: 4859: hosts.tab and domain.tab. The old file is copied to *.tab.backup but 4860: must be restored manually in case of a problem with the new table file. 4861: pushtable requires that the request be encrypted and validated via 4862: ValidateManager. The form of the command is: 4863: enc:pushtable tablename <tablecontents> \n 4864: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 4865: cleartext newline. 4866: 4867: =item Hanging up (exit or init) 4868: 4869: What to do when a client tells the server that they (the client) 4870: are leaving the network. 4871: 4872: =item unknown command 4873: 4874: If B<lond> is sent an unknown command (not in the list above), 4875: it replys to the client "unknown_cmd". 4876: 4877: 4878: =item UNKNOWN CLIENT 4879: 4880: If the anti-spoofing algorithm cannot verify the client, 4881: the client is rejected (with a "refused" message sent 4882: to the client, and the connection is closed. 4883: 4884: =back 4885: 4886: =head1 PREREQUISITES 4887: 4888: IO::Socket 4889: IO::File 4890: Apache::File 4891: Symbol 4892: POSIX 4893: Crypt::IDEA 4894: LWP::UserAgent() 4895: GDBM_File 4896: Authen::Krb4 4897: Authen::Krb5 4898: 4899: =head1 COREQUISITES 4900: 4901: =head1 OSNAMES 4902: 4903: linux 4904: 4905: =head1 SCRIPT CATEGORIES 4906: 4907: Server/Process 4908: 4909: =cut