loncom/lond - view

File: [LON-CAPA] / loncom / lond
Revision 1.234: download - view: text, annotated - select for diffs
Mon Aug 23 11:24:45 2004 UTC (19 years, 8 months ago) by foxr
Branches: MAIN
CVS tags: HEAD

Converted the following requests to hash dispatched handlers and did
some more stylistic cleanup:
addchat   - Add a chat item.
getchat   - Get items from chat room.
querysend - Send an asyncrhonous sql query.
queryreply- Get notified of the completion of an sql query initiated via
            querysend.
courseidput- Insert a course id in the course database.
courseiddump- Dump the set of course ids.

For chat functions and courseid functions, tested against output from
prior lond.  For sql functions, tested by querying published problem database
on lond, as well as by publishing new resources and querying for them.

1: #!/usr/bin/perl 2: # The LearningOnline Network 3: # lond "LON Daemon" Server (port "LOND" 5663) 4: # 5: # $Id: lond,v 1.234 2004/08/23 11:24:45 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 localenroll; 49: use File::Copy; 50: use LONCAPA::ConfigFileEdit; 51: use LONCAPA::lonlocal; 52: use LONCAPA::lonssl; 53: use Fcntl qw(:flock); 54: 55: my $DEBUG = 0; # Non zero to enable debug log entries. 56: 57: my $status=''; 58: my $lastlog=''; 59: 60: my $VERSION='$Revision: 1.234 $'; #' stupid emacs 61: my $remoteVERSION; 62: my $currenthostid="default"; 63: my $currentdomainid; 64: 65: my $client; 66: my $clientip; # IP address of client. 67: my $clientdns; # DNS name of client. 68: my $clientname; # LonCAPA name of client. 69: 70: my $server; 71: my $thisserver; # DNS of us. 72: 73: my $keymode; 74: 75: my $cipher; # Cipher key negotiated with client 76: my $tmpsnum = 0; # Id of tmpputs. 77: 78: # 79: # Connection type is: 80: # client - All client actions are allowed 81: # manager - only management functions allowed. 82: # both - Both management and client actions are allowed 83: # 84: 85: my $ConnectionType; 86: 87: my %hostid; # ID's for hosts in cluster by ip. 88: my %hostdom; # LonCAPA domain for hosts in cluster. 89: my %hostip; # IPs for hosts in cluster. 90: my %hostdns; # ID's of hosts looked up by DNS name. 91: 92: my %managers; # Ip -> manager names 93: 94: my %perlvar; # Will have the apache conf defined perl vars. 95: 96: # 97: # The hash below is used for command dispatching, and is therefore keyed on the request keyword. 98: # Each element of the hash contains a reference to an array that contains: 99: # A reference to a sub that executes the request corresponding to the keyword. 100: # A flag that is true if the request must be encoded to be acceptable. 101: # A mask with bits as follows: 102: # CLIENT_OK - Set when the function is allowed by ordinary clients 103: # MANAGER_OK - Set when the function is allowed to manager clients. 104: # 105: my $CLIENT_OK = 1; 106: my $MANAGER_OK = 2; 107: my %Dispatcher; 108: 109: 110: # 111: # The array below are password error strings." 112: # 113: my $lastpwderror = 13; # Largest error number from lcpasswd. 114: my @passwderrors = ("ok", 115: "lcpasswd must be run as user 'www'", 116: "lcpasswd got incorrect number of arguments", 117: "lcpasswd did not get the right nubmer of input text lines", 118: "lcpasswd too many simultaneous pwd changes in progress", 119: "lcpasswd User does not exist.", 120: "lcpasswd Incorrect current passwd", 121: "lcpasswd Unable to su to root.", 122: "lcpasswd Cannot set new passwd.", 123: "lcpasswd Username has invalid characters", 124: "lcpasswd Invalid characters in password", 125: "lcpasswd User already exists", 126: "lcpasswd Something went wrong with user addition.", 127: "lcpasswd Password mismatch", 128: "lcpasswd Error filename is invalid"); 129: 130: 131: # The array below are lcuseradd error strings.: 132: 133: my $lastadderror = 13; 134: my @adderrors = ("ok", 135: "User ID mismatch, lcuseradd must run as user www", 136: "lcuseradd Incorrect number of command line parameters must be 3", 137: "lcuseradd Incorrect number of stdinput lines, must be 3", 138: "lcuseradd Too many other simultaneous pwd changes in progress", 139: "lcuseradd User does not exist", 140: "lcuseradd Unable to make www member of users's group", 141: "lcuseradd Unable to su to root", 142: "lcuseradd Unable to set password", 143: "lcuseradd Usrname has invalid characters", 144: "lcuseradd Password has an invalid character", 145: "lcuseradd User already exists", 146: "lcuseradd Could not add user.", 147: "lcuseradd Password mismatch"); 148: 149: 150: 151: # 152: # Statistics that are maintained and dislayed in the status line. 153: # 154: my $Transactions = 0; # Number of attempted transactions. 155: my $Failures = 0; # Number of transcations failed. 156: 157: # ResetStatistics: 158: # Resets the statistics counters: 159: # 160: sub ResetStatistics { 161: $Transactions = 0; 162: $Failures = 0; 163: } 164: 165: #------------------------------------------------------------------------ 166: # 167: # LocalConnection 168: # Completes the formation of a locally authenticated connection. 169: # This function will ensure that the 'remote' client is really the 170: # local host. If not, the connection is closed, and the function fails. 171: # If so, initcmd is parsed for the name of a file containing the 172: # IDEA session key. The fie is opened, read, deleted and the session 173: # key returned to the caller. 174: # 175: # Parameters: 176: # $Socket - Socket open on client. 177: # $initcmd - The full text of the init command. 178: # 179: # Implicit inputs: 180: # $clientdns - The DNS name of the remote client. 181: # $thisserver - Our DNS name. 182: # 183: # Returns: 184: # IDEA session key on success. 185: # undef on failure. 186: # 187: sub LocalConnection { 188: my ($Socket, $initcmd) = @_; 189: Debug("Attempting local connection: $initcmd client: $clientdns me: $thisserver"); 190: if($clientdns ne $thisserver) { 191: &logthis(' LocalConnection rejecting non local: ' 192: ."$clientdns ne $thisserver "); 193: close $Socket; 194: return undef; 195: } else { 196: chomp($initcmd); # Get rid of \n in filename. 197: my ($init, $type, $name) = split(/:/, $initcmd); 198: Debug(" Init command: $init $type $name "); 199: 200: # Require that $init = init, and $type = local: Otherwise 201: # the caller is insane: 202: 203: if(($init ne "init") && ($type ne "local")) { 204: &logthis(' LocalConnection: caller is insane! ' 205: ."init = $init, and type = $type "); 206: close($Socket);; 207: return undef; 208: 209: } 210: # Now get the key filename: 211: 212: my $IDEAKey = lonlocal::ReadKeyFile($name); 213: return $IDEAKey; 214: } 215: } 216: #------------------------------------------------------------------------------ 217: # 218: # SSLConnection 219: # Completes the formation of an ssh authenticated connection. The 220: # socket is promoted to an ssl socket. If this promotion and the associated 221: # certificate exchange are successful, the IDEA key is generated and sent 222: # to the remote peer via the SSL tunnel. The IDEA key is also returned to 223: # the caller after the SSL tunnel is torn down. 224: # 225: # Parameters: 226: # Name Type Purpose 227: # $Socket IO::Socket::INET Plaintext socket. 228: # 229: # Returns: 230: # IDEA key on success. 231: # undef on failure. 232: # 233: sub SSLConnection { 234: my $Socket = shift; 235: 236: Debug("SSLConnection: "); 237: my $KeyFile = lonssl::KeyFile(); 238: if(!$KeyFile) { 239: my $err = lonssl::LastError(); 240: &logthis(" CRITICAL" 241: ."Can't get key file $err "); 242: return undef; 243: } 244: my ($CACertificate, 245: $Certificate) = lonssl::CertificateFile(); 246: 247: 248: # If any of the key, certificate or certificate authority 249: # certificate filenames are not defined, this can't work. 250: 251: if((!$Certificate) || (!$CACertificate)) { 252: my $err = lonssl::LastError(); 253: &logthis(" CRITICAL" 254: ."Can't get certificates: $err "); 255: 256: return undef; 257: } 258: Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate"); 259: 260: # Indicate to our peer that we can procede with 261: # a transition to ssl authentication: 262: 263: print $Socket "ok:ssl\n"; 264: 265: Debug("Approving promotion -> ssl"); 266: # And do so: 267: 268: my $SSLSocket = lonssl::PromoteServerSocket($Socket, 269: $CACertificate, 270: $Certificate, 271: $KeyFile); 272: if(! ($SSLSocket) ) { # SSL socket promotion failed. 273: my $err = lonssl::LastError(); 274: &logthis(" CRITICAL " 275: ."SSL Socket promotion failed: $err "); 276: return undef; 277: } 278: Debug("SSL Promotion successful"); 279: 280: # 281: # The only thing we'll use the socket for is to send the IDEA key 282: # to the peer: 283: 284: my $Key = lonlocal::CreateCipherKey(); 285: print $SSLSocket "$Key\n"; 286: 287: lonssl::Close($SSLSocket); 288: 289: Debug("Key exchange complete: $Key"); 290: 291: return $Key; 292: } 293: # 294: # InsecureConnection: 295: # If insecure connections are allowd, 296: # exchange a challenge with the client to 'validate' the 297: # client (not really, but that's the protocol): 298: # We produce a challenge string that's sent to the client. 299: # The client must then echo the challenge verbatim to us. 300: # 301: # Parameter: 302: # Socket - Socket open on the client. 303: # Returns: 304: # 1 - success. 305: # 0 - failure (e.g.mismatch or insecure not allowed). 306: # 307: sub InsecureConnection { 308: my $Socket = shift; 309: 310: # Don't even start if insecure connections are not allowed. 311: 312: if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed. 313: return 0; 314: } 315: 316: # Fabricate a challenge string and send it.. 317: 318: my $challenge = "$$".time; # pid + time. 319: print $Socket "$challenge\n"; 320: &status("Waiting for challenge reply"); 321: 322: my $answer = <$Socket>; 323: $answer =~s/\W//g; 324: if($challenge eq $answer) { 325: return 1; 326: } else { 327: logthis("WARNING client did not respond to challenge"); 328: &status("No challenge reqply"); 329: return 0; 330: } 331: 332: 333: } 334: 335: # 336: # GetCertificate: Given a transaction that requires a certificate, 337: # this function will extract the certificate from the transaction 338: # request. Note that at this point, the only concept of a certificate 339: # is the hostname to which we are connected. 340: # 341: # Parameter: 342: # request - The request sent by our client (this parameterization may 343: # need to change when we really use a certificate granting 344: # authority. 345: # 346: sub GetCertificate { 347: my $request = shift; 348: 349: return $clientip; 350: } 351: 352: # 353: # Return true if client is a manager. 354: # 355: sub isManager { 356: return (($ConnectionType eq "manager") || ($ConnectionType eq "both")); 357: } 358: # 359: # Return tru if client can do client functions 360: # 361: sub isClient { 362: return (($ConnectionType eq "client") || ($ConnectionType eq "both")); 363: } 364: 365: 366: # 367: # ReadManagerTable: Reads in the current manager table. For now this is 368: # done on each manager authentication because: 369: # - These authentications are not frequent 370: # - This allows dynamic changes to the manager table 371: # without the need to signal to the lond. 372: # 373: sub ReadManagerTable { 374: 375: # Clean out the old table first.. 376: 377: foreach my $key (keys %managers) { 378: delete $managers{$key}; 379: } 380: 381: my $tablename = $perlvar{'lonTabDir'}."/managers.tab"; 382: if (!open (MANAGERS, $tablename)) { 383: logthis('No manager table. Nobody can manage!!'); 384: return; 385: } 386: while(my $host = <MANAGERS>) { 387: chomp($host); 388: if ($host =~ "^#") { # Comment line. 389: next; 390: } 391: if (!defined $hostip{$host}) { # This is a non cluster member 392: # The entry is of the form: 393: # cluname:hostname 394: # cluname - A 'cluster hostname' is needed in order to negotiate 395: # the host key. 396: # hostname- The dns name of the host. 397: # 398: my($cluname, $dnsname) = split(/:/, $host); 399: 400: my $ip = gethostbyname($dnsname); 401: if(defined($ip)) { # bad names don't deserve entry. 402: my $hostip = inet_ntoa($ip); 403: $managers{$hostip} = $cluname; 404: logthis(' registering manager '. 405: "$dnsname as $cluname with $hostip \n"); 406: } 407: } else { 408: logthis(' existing host'." $host\n"); 409: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber 410: } 411: } 412: } 413: 414: # 415: # ValidManager: Determines if a given certificate represents a valid manager. 416: # in this primitive implementation, the 'certificate' is 417: # just the connecting loncapa client name. This is checked 418: # against a valid client list in the configuration. 419: # 420: # 421: sub ValidManager { 422: my $certificate = shift; 423: 424: return isManager; 425: } 426: # 427: # CopyFile: Called as part of the process of installing a 428: # new configuration file. This function copies an existing 429: # file to a backup file. 430: # Parameters: 431: # oldfile - Name of the file to backup. 432: # newfile - Name of the backup file. 433: # Return: 434: # 0 - Failure (errno has failure reason). 435: # 1 - Success. 436: # 437: sub CopyFile { 438: 439: my ($oldfile, $newfile) = @_; 440: 441: # The file must exist: 442: 443: if(-e $oldfile) { 444: 445: # Read the old file. 446: 447: my $oldfh = IO::File->new("< $oldfile"); 448: if(!$oldfh) { 449: return 0; 450: } 451: my @contents = <$oldfh>; # Suck in the entire file. 452: 453: # write the backup file: 454: 455: my $newfh = IO::File->new("> $newfile"); 456: if(!(defined $newfh)){ 457: return 0; 458: } 459: my $lines = scalar @contents; 460: for (my $i =0; $i < $lines; $i++) { 461: print $newfh ($contents[$i]); 462: } 463: 464: $oldfh->close; 465: $newfh->close; 466: 467: chmod(0660, $newfile); 468: 469: return 1; 470: 471: } else { 472: return 0; 473: } 474: } 475: # 476: # Host files are passed out with externally visible host IPs. 477: # If, for example, we are behind a fire-wall or NAT host, our 478: # internally visible IP may be different than the externally 479: # visible IP. Therefore, we always adjust the contents of the 480: # host file so that the entry for ME is the IP that we believe 481: # we have. At present, this is defined as the entry that 482: # DNS has for us. If by some chance we are not able to get a 483: # DNS translation for us, then we assume that the host.tab file 484: # is correct. 485: # BUGBUGBUG - in the future, we really should see if we can 486: # easily query the interface(s) instead. 487: # Parameter(s): 488: # contents - The contents of the host.tab to check. 489: # Returns: 490: # newcontents - The adjusted contents. 491: # 492: # 493: sub AdjustHostContents { 494: my $contents = shift; 495: my $adjusted; 496: my $me = $perlvar{'lonHostID'}; 497: 498: foreach my $line (split(/\n/,$contents)) { 499: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) { 500: chomp($line); 501: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line); 502: if ($id eq $me) { 503: my $ip = gethostbyname($name); 504: my $ipnew = inet_ntoa($ip); 505: $ip = $ipnew; 506: # Reconstruct the host line and append to adjusted: 507: 508: my $newline = "$id:$domain:$role:$name:$ip"; 509: if($maxcon ne "") { # Not all hosts have loncnew tuning params 510: $newline .= ":$maxcon:$idleto:$mincon"; 511: } 512: $adjusted .= $newline."\n"; 513: 514: } else { # Not me, pass unmodified. 515: $adjusted .= $line."\n"; 516: } 517: } else { # Blank or comment never re-written. 518: $adjusted .= $line."\n"; # Pass blanks and comments as is. 519: } 520: } 521: return $adjusted; 522: } 523: # 524: # InstallFile: Called to install an administrative file: 525: # - The file is created with <name>.tmp 526: # - The <name>.tmp file is then mv'd to <name> 527: # This lugubrious procedure is done to ensure that we are never without 528: # a valid, even if dated, version of the file regardless of who crashes 529: # and when the crash occurs. 530: # 531: # Parameters: 532: # Name of the file 533: # File Contents. 534: # Return: 535: # nonzero - success. 536: # 0 - failure and $! has an errno. 537: # 538: sub InstallFile { 539: 540: my ($Filename, $Contents) = @_; 541: my $TempFile = $Filename.".tmp"; 542: 543: # Open the file for write: 544: 545: my $fh = IO::File->new("> $TempFile"); # Write to temp. 546: if(!(defined $fh)) { 547: &logthis(' Unable to create '.$TempFile.""); 548: return 0; 549: } 550: # write the contents of the file: 551: 552: print $fh ($Contents); 553: $fh->close; # In case we ever have a filesystem w. locking 554: 555: chmod(0660, $TempFile); 556: 557: # Now we can move install the file in position. 558: 559: move($TempFile, $Filename); 560: 561: return 1; 562: } 563: 564: 565: # 566: # ConfigFileFromSelector: converts a configuration file selector 567: # (one of host or domain at this point) into a 568: # configuration file pathname. 569: # 570: # Parameters: 571: # selector - Configuration file selector. 572: # Returns: 573: # Full path to the file or undef if the selector is invalid. 574: # 575: sub ConfigFileFromSelector { 576: my $selector = shift; 577: my $tablefile; 578: 579: my $tabledir = $perlvar{'lonTabDir'}.'/'; 580: if ($selector eq "hosts") { 581: $tablefile = $tabledir."hosts.tab"; 582: } elsif ($selector eq "domain") { 583: $tablefile = $tabledir."domain.tab"; 584: } else { 585: return undef; 586: } 587: return $tablefile; 588: 589: } 590: # 591: # PushFile: Called to do an administrative push of a file. 592: # - Ensure the file being pushed is one we support. 593: # - Backup the old file to <filename.saved> 594: # - Separate the contents of the new file out from the 595: # rest of the request. 596: # - Write the new file. 597: # Parameter: 598: # Request - The entire user request. This consists of a : separated 599: # string pushfile:tablename:contents. 600: # NOTE: The contents may have :'s in it as well making things a bit 601: # more interesting... but not much. 602: # Returns: 603: # String to send to client ("ok" or "refused" if bad file). 604: # 605: sub PushFile { 606: my $request = shift; 607: my ($command, $filename, $contents) = split(":", $request, 3); 608: 609: # At this point in time, pushes for only the following tables are 610: # supported: 611: # hosts.tab ($filename eq host). 612: # domain.tab ($filename eq domain). 613: # Construct the destination filename or reject the request. 614: # 615: # lonManage is supposed to ensure this, however this session could be 616: # part of some elaborate spoof that managed somehow to authenticate. 617: # 618: 619: 620: my $tablefile = ConfigFileFromSelector($filename); 621: if(! (defined $tablefile)) { 622: return "refused"; 623: } 624: # 625: # >copy< the old table to the backup table 626: # don't rename in case system crashes/reboots etc. in the time 627: # window between a rename and write. 628: # 629: my $backupfile = $tablefile; 630: $backupfile =~ s/\.tab$/.old/; 631: if(!CopyFile($tablefile, $backupfile)) { 632: &logthis(' CopyFile from '.$tablefile." to ".$backupfile." failed "); 633: return "error:$!"; 634: } 635: &logthis(' Pushfile: backed up ' 636: .$tablefile." to $backupfile"); 637: 638: # If the file being pushed is the host file, we adjust the entry for ourself so that the 639: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible 640: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a 641: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now) 642: # that possibilty. 643: 644: if($filename eq "host") { 645: $contents = AdjustHostContents($contents); 646: } 647: 648: # Install the new file: 649: 650: if(!InstallFile($tablefile, $contents)) { 651: &logthis(' Pushfile: unable to install ' 652: .$tablefile." $! "); 653: return "error:$!"; 654: } else { 655: &logthis(' Installed new '.$tablefile 656: .""); 657: 658: } 659: 660: 661: # Indicate success: 662: 663: return "ok"; 664: 665: } 666: 667: # 668: # Called to re-init either lonc or lond. 669: # 670: # Parameters: 671: # request - The full request by the client. This is of the form 672: # reinit:<process> 673: # where <process> is allowed to be either of 674: # lonc or lond 675: # 676: # Returns: 677: # The string to be sent back to the client either: 678: # ok - Everything worked just fine. 679: # error:why - There was a failure and why describes the reason. 680: # 681: # 682: sub ReinitProcess { 683: my $request = shift; 684: 685: 686: # separate the request (reinit) from the process identifier and 687: # validate it producing the name of the .pid file for the process. 688: # 689: # 690: my ($junk, $process) = split(":", $request); 691: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/'; 692: if($process eq 'lonc') { 693: $processpidfile = $processpidfile."lonc.pid"; 694: if (!open(PIDFILE, "< $processpidfile")) { 695: return "error:Open failed for $processpidfile"; 696: } 697: my $loncpid = <PIDFILE>; 698: close(PIDFILE); 699: logthis(' Reinitializing lonc pid='.$loncpid 700: .""); 701: kill("USR2", $loncpid); 702: } elsif ($process eq 'lond') { 703: logthis(' Reinitializing self (lond) '); 704: &UpdateHosts; # Lond is us!! 705: } else { 706: &logthis('"); 708: return "error:Invalid process identifier $process"; 709: } 710: return 'ok'; 711: } 712: # Validate a line in a configuration file edit script: 713: # Validation includes: 714: # - Ensuring the command is valid. 715: # - Ensuring the command has sufficient parameters 716: # Parameters: 717: # scriptline - A line to validate (\n has been stripped for what it's worth). 718: # 719: # Return: 720: # 0 - Invalid scriptline. 721: # 1 - Valid scriptline 722: # NOTE: 723: # Only the command syntax is checked, not the executability of the 724: # command. 725: # 726: sub isValidEditCommand { 727: my $scriptline = shift; 728: 729: # Line elements are pipe separated: 730: 731: my ($command, $key, $newline) = split(/\|/, $scriptline); 732: &logthis(' isValideditCommand checking: '. 733: "Command = '$command', Key = '$key', Newline = '$newline' \n"); 734: 735: if ($command eq "delete") { 736: # 737: # key with no newline. 738: # 739: if( ($key eq "") || ($newline ne "")) { 740: return 0; # Must have key but no newline. 741: } else { 742: return 1; # Valid syntax. 743: } 744: } elsif ($command eq "replace") { 745: # 746: # key and newline: 747: # 748: if (($key eq "") || ($newline eq "")) { 749: return 0; 750: } else { 751: return 1; 752: } 753: } elsif ($command eq "append") { 754: if (($key ne "") && ($newline eq "")) { 755: return 1; 756: } else { 757: return 0; 758: } 759: } else { 760: return 0; # Invalid command. 761: } 762: return 0; # Should not get here!!! 763: } 764: # 765: # ApplyEdit - Applies an edit command to a line in a configuration 766: # file. It is the caller's responsiblity to validate the 767: # edit line. 768: # Parameters: 769: # $directive - A single edit directive to apply. 770: # Edit directives are of the form: 771: # append|newline - Appends a new line to the file. 772: # replace|key|newline - Replaces the line with key value 'key' 773: # delete|key - Deletes the line with key value 'key'. 774: # $editor - A config file editor object that contains the 775: # file being edited. 776: # 777: sub ApplyEdit { 778: 779: my ($directive, $editor) = @_; 780: 781: # Break the directive down into its command and its parameters 782: # (at most two at this point. The meaning of the parameters, if in fact 783: # they exist depends on the command). 784: 785: my ($command, $p1, $p2) = split(/\|/, $directive); 786: 787: if($command eq "append") { 788: $editor->Append($p1); # p1 - key p2 null. 789: } elsif ($command eq "replace") { 790: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline. 791: } elsif ($command eq "delete") { 792: $editor->DeleteLine($p1); # p1 - key p2 null. 793: } else { # Should not get here!!! 794: die "Invalid command given to ApplyEdit $command" 795: } 796: } 797: # 798: # AdjustOurHost: 799: # Adjusts a host file stored in a configuration file editor object 800: # for the true IP address of this host. This is necessary for hosts 801: # that live behind a firewall. 802: # Those hosts have a publicly distributed IP of the firewall, but 803: # internally must use their actual IP. We assume that a given 804: # host only has a single IP interface for now. 805: # Formal Parameters: 806: # editor - The configuration file editor to adjust. This 807: # editor is assumed to contain a hosts.tab file. 808: # Strategy: 809: # - Figure out our hostname. 810: # - Lookup the entry for this host. 811: # - Modify the line to contain our IP 812: # - Do a replace for this host. 813: sub AdjustOurHost { 814: my $editor = shift; 815: 816: # figure out who I am. 817: 818: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname. 819: 820: # Get my host file entry. 821: 822: my $ConfigLine = $editor->Find($myHostName); 823: if(! (defined $ConfigLine)) { 824: die "AdjustOurHost - no entry for me in hosts file $myHostName"; 825: } 826: # figure out my IP: 827: # Use the config line to get my hostname. 828: # Use gethostbyname to translate that into an IP address. 829: # 830: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine); 831: my $BinaryIp = gethostbyname($name); 832: my $ip = inet_ntoa($ip); 833: # 834: # Reassemble the config line from the elements in the list. 835: # Note that if the loncnew items were not present before, they will 836: # be now even if they would be empty 837: # 838: my $newConfigLine = $id; 839: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) { 840: $newConfigLine .= ":".$item; 841: } 842: # Replace the line: 843: 844: $editor->ReplaceLine($id, $newConfigLine); 845: 846: } 847: # 848: # ReplaceConfigFile: 849: # Replaces a configuration file with the contents of a 850: # configuration file editor object. 851: # This is done by: 852: # - Copying the target file to <filename>.old 853: # - Writing the new file to <filename>.tmp 854: # - Moving <filename.tmp> -> <filename> 855: # This laborious process ensures that the system is never without 856: # a configuration file that's at least valid (even if the contents 857: # may be dated). 858: # Parameters: 859: # filename - Name of the file to modify... this is a full path. 860: # editor - Editor containing the file. 861: # 862: sub ReplaceConfigFile { 863: 864: my ($filename, $editor) = @_; 865: 866: CopyFile ($filename, $filename.".old"); 867: 868: my $contents = $editor->Get(); # Get the contents of the file. 869: 870: InstallFile($filename, $contents); 871: } 872: # 873: # 874: # Called to edit a configuration table file 875: # Parameters: 876: # request - The entire command/request sent by lonc or lonManage 877: # Return: 878: # The reply to send to the client. 879: # 880: sub EditFile { 881: my $request = shift; 882: 883: # Split the command into it's pieces: edit:filetype:script 884: 885: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script 886: 887: # Check the pre-coditions for success: 888: 889: if($request != "edit") { # Something is amiss afoot alack. 890: return "error:edit request detected, but request != 'edit'\n"; 891: } 892: if( ($filetype ne "hosts") && 893: ($filetype ne "domain")) { 894: return "error:edit requested with invalid file specifier: $filetype \n"; 895: } 896: 897: # Split the edit script and check it's validity. 898: 899: my @scriptlines = split(/\n/, $script); # one line per element. 900: my $linecount = scalar(@scriptlines); 901: for(my $i = 0; $i < $linecount; $i++) { 902: chomp($scriptlines[$i]); 903: if(!isValidEditCommand($scriptlines[$i])) { 904: return "error:edit with bad script line: '$scriptlines[$i]' \n"; 905: } 906: } 907: 908: # Execute the edit operation. 909: # - Create a config file editor for the appropriate file and 910: # - execute each command in the script: 911: # 912: my $configfile = ConfigFileFromSelector($filetype); 913: if (!(defined $configfile)) { 914: return "refused\n"; 915: } 916: my $editor = ConfigFileEdit->new($configfile); 917: 918: for (my $i = 0; $i < $linecount; $i++) { 919: ApplyEdit($scriptlines[$i], $editor); 920: } 921: # If the file is the host file, ensure that our host is 922: # adjusted to have our ip: 923: # 924: if($filetype eq "host") { 925: AdjustOurHost($editor); 926: } 927: # Finally replace the current file with our file. 928: # 929: ReplaceConfigFile($configfile, $editor); 930: 931: return "ok\n"; 932: } 933: 934: #--------------------------------------------------------------- 935: # 936: # Manipulation of hash based databases (factoring out common code 937: # for later use as we refactor. 938: # 939: # Ties a domain level resource file to a hash. 940: # If requested a history entry is created in the associated hist file. 941: # 942: # Parameters: 943: # domain - Name of the domain in which the resource file lives. 944: # namespace - Name of the hash within that domain. 945: # how - How to tie the hash (e.g. GDBM_WRCREAT()). 946: # loghead - Optional parameter, if present a log entry is created 947: # in the associated history file and this is the first part 948: # of that entry. 949: # logtail - Goes along with loghead, The actual logentry is of the 950: # form $loghead:<timestamp>:logtail. 951: # Returns: 952: # Reference to a hash bound to the db file or alternatively undef 953: # if the tie failed. 954: # 955: sub tie_domain_hash { 956: my ($domain,$namespace,$how,$loghead,$logtail) = @_; 957: 958: # Filter out any whitespace in the domain name: 959: 960: $domain =~ s/\W//g; 961: 962: # We have enough to go on to tie the hash: 963: 964: my $user_top_dir = $perlvar{'lonUsersDir'}; 965: my $domain_dir = $user_top_dir."/$domain"; 966: my $resource_file = $domain_dir."/$namespace.db"; 967: my %hash; 968: if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) { 969: if (defined($loghead)) { # Need to log the operation. 970: my $logFh = IO::File->new(">>$domain_dir/$namespace.hist"); 971: if($logFh) { 972: my $timestamp = time; 973: print $logFh "$loghead:$timestamp:$logtail\n"; 974: } 975: $logFh->close; 976: } 977: return \%hash; # Return the tied hash. 978: } else { 979: return undef; # Tie failed. 980: } 981: } 982: 983: # 984: # Ties a user's resource file to a hash. 985: # If necessary, an appropriate history 986: # log file entry is made as well. 987: # This sub factors out common code from the subs that manipulate 988: # the various gdbm files that keep keyword value pairs. 989: # Parameters: 990: # domain - Name of the domain the user is in. 991: # user - Name of the 'current user'. 992: # namespace - Namespace representing the file to tie. 993: # how - What the tie is done to (e.g. GDBM_WRCREAT(). 994: # loghead - Optional first part of log entry if there may be a 995: # history file. 996: # what - Optional tail of log entry if there may be a history 997: # file. 998: # Returns: 999: # hash to which the database is tied. It's up to the caller to untie. 1000: # undef if the has could not be tied. 1001: # 1002: sub tie_user_hash { 1003: my ($domain,$user,$namespace,$how,$loghead,$what) = @_; 1004: 1005: $namespace=~s/\//\_/g; # / -> _ 1006: $namespace=~s/\W//g; # whitespace eliminated. 1007: my $proname = propath($domain, $user); 1008: 1009: # Tie the database. 1010: 1011: my %hash; 1012: if(tie(%hash, 'GDBM_File', "$proname/$namespace.db", 1013: $how, 0640)) { 1014: # If this is a namespace for which a history is kept, 1015: # make the history log entry: 1016: if (($namespace =~/^nohist\_/) && (defined($loghead))) { 1017: my $args = scalar @_; 1018: Debug(" Opening history: $namespace $args"); 1019: my $hfh = IO::File->new(">>$proname/$namespace.hist"); 1020: if($hfh) { 1021: my $now = time; 1022: print $hfh "$loghead:$now:$what\n"; 1023: } 1024: $hfh->close; 1025: } 1026: return \%hash; 1027: } else { 1028: return undef; 1029: } 1030: 1031: } 1032: 1033: #--------------------- Request Handlers -------------------------------------------- 1034: # 1035: # By convention each request handler registers itself prior to the sub 1036: # declaration: 1037: # 1038: 1039: #++ 1040: # 1041: # Handles ping requests. 1042: # Parameters: 1043: # $cmd - the actual keyword that invoked us. 1044: # $tail - the tail of the request that invoked us. 1045: # $replyfd- File descriptor connected to the client 1046: # Implicit Inputs: 1047: # $currenthostid - Global variable that carries the name of the host we are 1048: # known as. 1049: # Returns: 1050: # 1 - Ok to continue processing. 1051: # 0 - Program should exit. 1052: # Side effects: 1053: # Reply information is sent to the client. 1054: 1055: sub ping_handler { 1056: my ($cmd, $tail, $client) = @_; 1057: Debug("$cmd $tail $client .. $currenthostid:"); 1058: 1059: Reply( $client,"$currenthostid\n","$cmd:$tail"); 1060: 1061: return 1; 1062: } 1063: &register_handler("ping", \&ping_handler, 0, 1, 1); # Ping unencoded, client or manager. 1064: 1065: #++ 1066: # 1067: # Handles pong requests. Pong replies with our current host id, and 1068: # the results of a ping sent to us via our lonc. 1069: # 1070: # Parameters: 1071: # $cmd - the actual keyword that invoked us. 1072: # $tail - the tail of the request that invoked us. 1073: # $replyfd- File descriptor connected to the client 1074: # Implicit Inputs: 1075: # $currenthostid - Global variable that carries the name of the host we are 1076: # connected to. 1077: # Returns: 1078: # 1 - Ok to continue processing. 1079: # 0 - Program should exit. 1080: # Side effects: 1081: # Reply information is sent to the client. 1082: 1083: sub pong_handler { 1084: my ($cmd, $tail, $replyfd) = @_; 1085: 1086: my $reply=&reply("ping",$clientname); 1087: &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 1088: return 1; 1089: } 1090: &register_handler("pong", \&pong_handler, 0, 1, 1); # Pong unencoded, client or manager 1091: 1092: #++ 1093: # Called to establish an encrypted session key with the remote client. 1094: # Note that with secure lond, in most cases this function is never 1095: # invoked. Instead, the secure session key is established either 1096: # via a local file that's locked down tight and only lives for a short 1097: # time, or via an ssl tunnel...and is generated from a bunch-o-random 1098: # bits from /dev/urandom, rather than the predictable pattern used by 1099: # by this sub. This sub is only used in the old-style insecure 1100: # key negotiation. 1101: # Parameters: 1102: # $cmd - the actual keyword that invoked us. 1103: # $tail - the tail of the request that invoked us. 1104: # $replyfd- File descriptor connected to the client 1105: # Implicit Inputs: 1106: # $currenthostid - Global variable that carries the name of the host 1107: # known as. 1108: # $clientname - Global variable that carries the name of the hsot we're connected to. 1109: # Returns: 1110: # 1 - Ok to continue processing. 1111: # 0 - Program should exit. 1112: # Implicit Outputs: 1113: # Reply information is sent to the client. 1114: # $cipher is set with a reference to a new IDEA encryption object. 1115: # 1116: sub establish_key_handler { 1117: my ($cmd, $tail, $replyfd) = @_; 1118: 1119: my $buildkey=time.$$.int(rand 100000); 1120: $buildkey=~tr/1-6/A-F/; 1121: $buildkey=int(rand 100000).$buildkey.int(rand 100000); 1122: my $key=$currenthostid.$clientname; 1123: $key=~tr/a-z/A-Z/; 1124: $key=~tr/G-P/0-9/; 1125: $key=~tr/Q-Z/0-9/; 1126: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey; 1127: $key=substr($key,0,32); 1128: my $cipherkey=pack("H32",$key); 1129: $cipher=new IDEA $cipherkey; 1130: &Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 1131: 1132: return 1; 1133: 1134: } 1135: &register_handler("ekey", \&establish_key_handler, 0, 1,1); 1136: 1137: 1138: # Handler for the load command. Returns the current system load average 1139: # to the requestor. 1140: # 1141: # Parameters: 1142: # $cmd - the actual keyword that invoked us. 1143: # $tail - the tail of the request that invoked us. 1144: # $replyfd- File descriptor connected to the client 1145: # Implicit Inputs: 1146: # $currenthostid - Global variable that carries the name of the host 1147: # known as. 1148: # $clientname - Global variable that carries the name of the hsot we're connected to. 1149: # Returns: 1150: # 1 - Ok to continue processing. 1151: # 0 - Program should exit. 1152: # Side effects: 1153: # Reply information is sent to the client. 1154: sub load_handler { 1155: my ($cmd, $tail, $replyfd) = @_; 1156: 1157: # Get the load average from /proc/loadavg and calculate it as a percentage of 1158: # the allowed load limit as set by the perl global variable lonLoadLim 1159: 1160: my $loadavg; 1161: my $loadfile=IO::File->new('/proc/loadavg'); 1162: 1163: $loadavg=<$loadfile>; 1164: $loadavg =~ s/\s.*//g; # Extract the first field only. 1165: 1166: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'}; 1167: 1168: &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail"); 1169: 1170: return 1; 1171: } 1172: register_handler("load", \&load_handler, 0, 1, 0); 1173: 1174: # 1175: # Process the userload request. This sub returns to the client the current 1176: # user load average. It can be invoked either by clients or managers. 1177: # 1178: # Parameters: 1179: # $cmd - the actual keyword that invoked us. 1180: # $tail - the tail of the request that invoked us. 1181: # $replyfd- File descriptor connected to the client 1182: # Implicit Inputs: 1183: # $currenthostid - Global variable that carries the name of the host 1184: # known as. 1185: # $clientname - Global variable that carries the name of the hsot we're connected to. 1186: # Returns: 1187: # 1 - Ok to continue processing. 1188: # 0 - Program should exit 1189: # Implicit inputs: 1190: # whatever the userload() function requires. 1191: # Implicit outputs: 1192: # the reply is written to the client. 1193: # 1194: sub user_load_handler { 1195: my ($cmd, $tail, $replyfd) = @_; 1196: 1197: my $userloadpercent=&userload(); 1198: &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail"); 1199: 1200: return 1; 1201: } 1202: register_handler("userload", \&user_load_handler, 0, 1, 0); 1203: 1204: # Process a request for the authorization type of a user: 1205: # (userauth). 1206: # 1207: # Parameters: 1208: # $cmd - the actual keyword that invoked us. 1209: # $tail - the tail of the request that invoked us. 1210: # $replyfd- File descriptor connected to the client 1211: # Returns: 1212: # 1 - Ok to continue processing. 1213: # 0 - Program should exit 1214: # Implicit outputs: 1215: # The user authorization type is written to the client. 1216: # 1217: sub user_authorization_type { 1218: my ($cmd, $tail, $replyfd) = @_; 1219: 1220: my $userinput = "$cmd:$tail"; 1221: 1222: # Pull the domain and username out of the command tail. 1223: # and call get_auth_type to determine the authentication type. 1224: 1225: my ($udom,$uname)=split(/:/,$tail); 1226: my $result = &get_auth_type($udom, $uname); 1227: if($result eq "nouser") { 1228: &Failure( $replyfd, "unknown_user\n", $userinput); 1229: } else { 1230: # 1231: # We only want to pass the second field from get_auth_type 1232: # for ^krb.. otherwise we'll be handing out the encrypted 1233: # password for internals e.g. 1234: # 1235: my ($type,$otherinfo) = split(/:/,$result); 1236: if($type =~ /^krb/) { 1237: $type = $result; 1238: } 1239: &Reply( $replyfd, "$type:\n", $userinput); 1240: } 1241: 1242: return 1; 1243: } 1244: &register_handler("currentauth", \&user_authorization_type, 1, 1, 0); 1245: 1246: # Process a request by a manager to push a hosts or domain table 1247: # to us. We pick apart the command and pass it on to the subs 1248: # that already exist to do this. 1249: # 1250: # Parameters: 1251: # $cmd - the actual keyword that invoked us. 1252: # $tail - the tail of the request that invoked us. 1253: # $client - File descriptor connected to the client 1254: # Returns: 1255: # 1 - Ok to continue processing. 1256: # 0 - Program should exit 1257: # Implicit Output: 1258: # a reply is written to the client. 1259: 1260: sub push_file_handler { 1261: my ($cmd, $tail, $client) = @_; 1262: 1263: my $userinput = "$cmd:$tail"; 1264: 1265: # At this time we only know that the IP of our partner is a valid manager 1266: # the code below is a hook to do further authentication (e.g. to resolve 1267: # spoofing). 1268: 1269: my $cert = &GetCertificate($userinput); 1270: if(&ValidManager($cert)) { 1271: 1272: # Now presumably we have the bona fides of both the peer host and the 1273: # process making the request. 1274: 1275: my $reply = &PushFile($userinput); 1276: &Reply($client, "$reply\n", $userinput); 1277: 1278: } else { 1279: &Failure( $client, "refused\n", $userinput); 1280: } 1281: return 1; 1282: } 1283: &register_handler("pushfile", \&push_file_handler, 1, 0, 1); 1284: 1285: 1286: 1287: # Process a reinit request. Reinit requests that either 1288: # lonc or lond be reinitialized so that an updated 1289: # host.tab or domain.tab can be processed. 1290: # 1291: # Parameters: 1292: # $cmd - the actual keyword that invoked us. 1293: # $tail - the tail of the request that invoked us. 1294: # $client - File descriptor connected to the client 1295: # Returns: 1296: # 1 - Ok to continue processing. 1297: # 0 - Program should exit 1298: # Implicit output: 1299: # a reply is sent to the client. 1300: # 1301: sub reinit_process_handler { 1302: my ($cmd, $tail, $client) = @_; 1303: 1304: my $userinput = "$cmd:$tail"; 1305: 1306: my $cert = &GetCertificate($userinput); 1307: if(&ValidManager($cert)) { 1308: chomp($userinput); 1309: my $reply = &ReinitProcess($userinput); 1310: &Reply( $client, "$reply\n", $userinput); 1311: } else { 1312: &Failure( $client, "refused\n", $userinput); 1313: } 1314: return 1; 1315: } 1316: 1317: &register_handler("reinit", \&reinit_process_handler, 1, 0, 1); 1318: 1319: # Process the editing script for a table edit operation. 1320: # the editing operation must be encrypted and requested by 1321: # a manager host. 1322: # 1323: # Parameters: 1324: # $cmd - the actual keyword that invoked us. 1325: # $tail - the tail of the request that invoked us. 1326: # $client - File descriptor connected to the client 1327: # Returns: 1328: # 1 - Ok to continue processing. 1329: # 0 - Program should exit 1330: # Implicit output: 1331: # a reply is sent to the client. 1332: # 1333: sub edit_table_handler { 1334: my ($command, $tail, $client) = @_; 1335: 1336: my $userinput = "$command:$tail"; 1337: 1338: my $cert = &GetCertificate($userinput); 1339: if(&ValidManager($cert)) { 1340: my($filetype, $script) = split(/:/, $tail); 1341: if (($filetype eq "hosts") || 1342: ($filetype eq "domain")) { 1343: if($script ne "") { 1344: &Reply($client, # BUGBUG - EditFile 1345: &EditFile($userinput), # could fail. 1346: $userinput); 1347: } else { 1348: &Failure($client,"refused\n",$userinput); 1349: } 1350: } else { 1351: &Failure($client,"refused\n",$userinput); 1352: } 1353: } else { 1354: &Failure($client,"refused\n",$userinput); 1355: } 1356: return 1; 1357: } 1358: register_handler("edit", \&edit_table_handler, 1, 0, 1); 1359: 1360: 1361: # 1362: # Authenticate a user against the LonCAPA authentication 1363: # database. Note that there are several authentication 1364: # possibilities: 1365: # - unix - The user can be authenticated against the unix 1366: # password file. 1367: # - internal - The user can be authenticated against a purely 1368: # internal per user password file. 1369: # - kerberos - The user can be authenticated against either a kerb4 or kerb5 1370: # ticket granting authority. 1371: # - user - The person tailoring LonCAPA can supply a user authentication 1372: # mechanism that is per system. 1373: # 1374: # Parameters: 1375: # $cmd - The command that got us here. 1376: # $tail - Tail of the command (remaining parameters). 1377: # $client - File descriptor connected to client. 1378: # Returns 1379: # 0 - Requested to exit, caller should shut down. 1380: # 1 - Continue processing. 1381: # Implicit inputs: 1382: # The authentication systems describe above have their own forms of implicit 1383: # input into the authentication process that are described above. 1384: # 1385: sub authenticate_handler { 1386: my ($cmd, $tail, $client) = @_; 1387: 1388: 1389: # Regenerate the full input line 1390: 1391: my $userinput = $cmd.":".$tail; 1392: 1393: # udom - User's domain. 1394: # uname - Username. 1395: # upass - User's password. 1396: 1397: my ($udom,$uname,$upass)=split(/:/,$tail); 1398: &Debug(" Authenticate domain = $udom, user = $uname, password = $upass"); 1399: chomp($upass); 1400: $upass=&unescape($upass); 1401: 1402: my $pwdcorrect = &validate_user($udom, $uname, $upass); 1403: if($pwdcorrect) { 1404: &Reply( $client, "authorized\n", $userinput); 1405: # 1406: # Bad credentials: Failed to authorize 1407: # 1408: } else { 1409: &Failure( $client, "non_authorized\n", $userinput); 1410: } 1411: 1412: return 1; 1413: } 1414: 1415: register_handler("auth", \&authenticate_handler, 1, 1, 0); 1416: 1417: # 1418: # Change a user's password. Note that this function is complicated by 1419: # the fact that a user may be authenticated in more than one way: 1420: # At present, we are not able to change the password for all types of 1421: # authentication methods. Only for: 1422: # unix - unix password or shadow passoword style authentication. 1423: # local - Locally written authentication mechanism. 1424: # For now, kerb4 and kerb5 password changes are not supported and result 1425: # in an error. 1426: # FUTURE WORK: 1427: # Support kerberos passwd changes? 1428: # Parameters: 1429: # $cmd - The command that got us here. 1430: # $tail - Tail of the command (remaining parameters). 1431: # $client - File descriptor connected to client. 1432: # Returns 1433: # 0 - Requested to exit, caller should shut down. 1434: # 1 - Continue processing. 1435: # Implicit inputs: 1436: # The authentication systems describe above have their own forms of implicit 1437: # input into the authentication process that are described above. 1438: sub change_password_handler { 1439: my ($cmd, $tail, $client) = @_; 1440: 1441: my $userinput = $cmd.":".$tail; # Reconstruct client's string. 1442: 1443: # 1444: # udom - user's domain. 1445: # uname - Username. 1446: # upass - Current password. 1447: # npass - New password. 1448: 1449: my ($udom,$uname,$upass,$npass)=split(/:/,$tail); 1450: 1451: $upass=&unescape($upass); 1452: $npass=&unescape($npass); 1453: &Debug("Trying to change password for $uname"); 1454: 1455: # First require that the user can be authenticated with their 1456: # old password: 1457: 1458: my $validated = &validate_user($udom, $uname, $upass); 1459: if($validated) { 1460: my $realpasswd = &get_auth_type($udom, $uname); # Defined since authd. 1461: 1462: my ($howpwd,$contentpwd)=split(/:/,$realpasswd); 1463: if ($howpwd eq 'internal') { 1464: &Debug("internal auth"); 1465: my $salt=time; 1466: $salt=substr($salt,6,2); 1467: my $ncpass=crypt($npass,$salt); 1468: if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) { 1469: &logthis("Result of password change for " 1470: ."$uname: pwchange_success"); 1471: &Reply($client, "ok\n", $userinput); 1472: } else { 1473: &logthis("Unable to open $uname passwd " 1474: ."to change password"); 1475: &Failure( $client, "non_authorized\n",$userinput); 1476: } 1477: } elsif ($howpwd eq 'unix') { 1478: # Unix means we have to access /etc/password 1479: &Debug("auth is unix"); 1480: my $execdir=$perlvar{'lonDaemons'}; 1481: &Debug("Opening lcpasswd pipeline"); 1482: my $pf = IO::File->new("|$execdir/lcpasswd > " 1483: ."$perlvar{'lonDaemons'}" 1484: ."/logs/lcpasswd.log"); 1485: print $pf "$uname\n$npass\n$npass\n"; 1486: close $pf; 1487: my $err = $?; 1488: my $result = ($err>0 ? 'pwchange_failure' : 'ok'); 1489: &logthis("Result of password change for $uname: ". 1490: &lcpasswdstrerror($?)); 1491: &Reply($client, "$result\n", $userinput); 1492: } else { 1493: # this just means that the current password mode is not 1494: # one we know how to change (e.g the kerberos auth modes or 1495: # locally written auth handler). 1496: # 1497: &Failure( $client, "auth_mode_error\n", $userinput); 1498: } 1499: 1500: } else { 1501: &Failure( $client, "non_authorized\n", $userinput); 1502: } 1503: 1504: return 1; 1505: } 1506: register_handler("passwd", \&change_password_handler, 1, 1, 0); 1507: 1508: 1509: # 1510: # Create a new user. User in this case means a lon-capa user. 1511: # The user must either already exist in some authentication realm 1512: # like kerberos or the /etc/passwd. If not, a user completely local to 1513: # this loncapa system is created. 1514: # 1515: # Parameters: 1516: # $cmd - The command that got us here. 1517: # $tail - Tail of the command (remaining parameters). 1518: # $client - File descriptor connected to client. 1519: # Returns 1520: # 0 - Requested to exit, caller should shut down. 1521: # 1 - Continue processing. 1522: # Implicit inputs: 1523: # The authentication systems describe above have their own forms of implicit 1524: # input into the authentication process that are described above. 1525: sub add_user_handler { 1526: 1527: my ($cmd, $tail, $client) = @_; 1528: 1529: 1530: my ($udom,$uname,$umode,$npass)=split(/:/,$tail); 1531: my $userinput = $cmd.":".$tail; # Reconstruct the full request line. 1532: 1533: &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname); 1534: 1535: 1536: if($udom eq $currentdomainid) { # Reject new users for other domains... 1537: 1538: my $oldumask=umask(0077); 1539: chomp($npass); 1540: $npass=&unescape($npass); 1541: my $passfilename = &password_path($udom, $uname); 1542: &Debug("Password file created will be:".$passfilename); 1543: if (-e $passfilename) { 1544: &Failure( $client, "already_exists\n", $userinput); 1545: } else { 1546: my @fpparts=split(/\//,$passfilename); 1547: my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2]; 1548: my $fperror=''; 1549: for (my $i=3;$i<= ($#fpparts-1);$i++) { 1550: $fpnow.='/'.$fpparts[$i]; 1551: unless (-e $fpnow) { 1552: &logthis("mkdir $fpnow"); 1553: unless (mkdir($fpnow,0777)) { 1554: $fperror="error: ".($!+0)." mkdir failed while attempting " 1555: ."makeuser"; 1556: } 1557: } 1558: } 1559: unless ($fperror) { 1560: my $result=&make_passwd_file($uname, $umode,$npass, $passfilename); 1561: &Reply($client, $result, $userinput); #BUGBUG - could be fail 1562: } else { 1563: &Failure($client, "$fperror\n", $userinput); 1564: } 1565: } 1566: umask($oldumask); 1567: } else { 1568: &Failure($client, "not_right_domain\n", 1569: $userinput); # Even if we are multihomed. 1570: 1571: } 1572: return 1; 1573: 1574: } 1575: &register_handler("makeuser", \&add_user_handler, 1, 1, 0); 1576: 1577: # 1578: # Change the authentication method of a user. Note that this may 1579: # also implicitly change the user's password if, for example, the user is 1580: # joining an existing authentication realm. Known authentication realms at 1581: # this time are: 1582: # internal - Purely internal password file (only loncapa knows this user) 1583: # local - Institutionally written authentication module. 1584: # unix - Unix user (/etc/passwd with or without /etc/shadow). 1585: # kerb4 - kerberos version 4 1586: # kerb5 - kerberos version 5 1587: # 1588: # Parameters: 1589: # $cmd - The command that got us here. 1590: # $tail - Tail of the command (remaining parameters). 1591: # $client - File descriptor connected to client. 1592: # Returns 1593: # 0 - Requested to exit, caller should shut down. 1594: # 1 - Continue processing. 1595: # Implicit inputs: 1596: # The authentication systems describe above have their own forms of implicit 1597: # input into the authentication process that are described above. 1598: # 1599: sub change_authentication_handler { 1600: 1601: my ($cmd, $tail, $client) = @_; 1602: 1603: my $userinput = "$cmd:$tail"; # Reconstruct user input. 1604: 1605: my ($udom,$uname,$umode,$npass)=split(/:/,$tail); 1606: &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode); 1607: if ($udom ne $currentdomainid) { 1608: &Failure( $client, "not_right_domain\n", $client); 1609: } else { 1610: 1611: chomp($npass); 1612: 1613: $npass=&unescape($npass); 1614: my $passfilename = &password_path($udom, $uname); 1615: if ($passfilename) { # Not allowed to create a new user!! 1616: my $result=&make_passwd_file($uname, $umode,$npass,$passfilename); 1617: &Reply($client, $result, $userinput); 1618: } else { 1619: &Failure($client, "non_authorized", $userinput); # Fail the user now. 1620: } 1621: } 1622: return 1; 1623: } 1624: &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0); 1625: 1626: # 1627: # Determines if this is the home server for a user. The home server 1628: # for a user will have his/her lon-capa passwd file. Therefore all we need 1629: # to do is determine if this file exists. 1630: # 1631: # Parameters: 1632: # $cmd - The command that got us here. 1633: # $tail - Tail of the command (remaining parameters). 1634: # $client - File descriptor connected to client. 1635: # Returns 1636: # 0 - Requested to exit, caller should shut down. 1637: # 1 - Continue processing. 1638: # Implicit inputs: 1639: # The authentication systems describe above have their own forms of implicit 1640: # input into the authentication process that are described above. 1641: # 1642: sub is_home_handler { 1643: my ($cmd, $tail, $client) = @_; 1644: 1645: my $userinput = "$cmd:$tail"; 1646: 1647: my ($udom,$uname)=split(/:/,$tail); 1648: chomp($uname); 1649: my $passfile = &password_filename($udom, $uname); 1650: if($passfile) { 1651: &Reply( $client, "found\n", $userinput); 1652: } else { 1653: &Failure($client, "not_found\n", $userinput); 1654: } 1655: return 1; 1656: } 1657: &register_handler("home", \&is_home_handler, 0,1,0); 1658: 1659: # 1660: # Process an update request for a resource?? I think what's going on here is 1661: # that a resource has been modified that we hold a subscription to. 1662: # If the resource is not local, then we must update, or at least invalidate our 1663: # cached copy of the resource. 1664: # FUTURE WORK: 1665: # I need to look at this logic carefully. My druthers would be to follow 1666: # typical caching logic, and simple invalidate the cache, drop any subscription 1667: # an let the next fetch start the ball rolling again... however that may 1668: # actually be more difficult than it looks given the complex web of 1669: # proxy servers. 1670: # Parameters: 1671: # $cmd - The command that got us here. 1672: # $tail - Tail of the command (remaining parameters). 1673: # $client - File descriptor connected to client. 1674: # Returns 1675: # 0 - Requested to exit, caller should shut down. 1676: # 1 - Continue processing. 1677: # Implicit inputs: 1678: # The authentication systems describe above have their own forms of implicit 1679: # input into the authentication process that are described above. 1680: # 1681: sub update_resource_handler { 1682: 1683: my ($cmd, $tail, $client) = @_; 1684: 1685: my $userinput = "$cmd:$tail"; 1686: 1687: my $fname= $tail; # This allows interactive testing 1688: 1689: 1690: my $ownership=ishome($fname); 1691: if ($ownership eq 'not_owner') { 1692: if (-e $fname) { 1693: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size, 1694: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname); 1695: my $now=time; 1696: my $since=$now-$atime; 1697: if ($since>$perlvar{'lonExpire'}) { 1698: my $reply=&reply("unsub:$fname","$clientname"); 1699: unlink("$fname"); 1700: } else { 1701: my $transname="$fname.in.transfer"; 1702: my $remoteurl=&reply("sub:$fname","$clientname"); 1703: my $response; 1704: alarm(120); 1705: { 1706: my $ua=new LWP::UserAgent; 1707: my $request=new HTTP::Request('GET',"$remoteurl"); 1708: $response=$ua->request($request,$transname); 1709: } 1710: alarm(0); 1711: if ($response->is_error()) { 1712: unlink($transname); 1713: my $message=$response->status_line; 1714: &logthis("LWP GET: $message for $fname ($remoteurl)"); 1715: } else { 1716: if ($remoteurl!~/\.meta$/) { 1717: alarm(120); 1718: { 1719: my $ua=new LWP::UserAgent; 1720: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta'); 1721: my $mresponse=$ua->request($mrequest,$fname.'.meta'); 1722: if ($mresponse->is_error()) { 1723: unlink($fname.'.meta'); 1724: } 1725: } 1726: alarm(0); 1727: } 1728: rename($transname,$fname); 1729: } 1730: } 1731: &Reply( $client, "ok\n", $userinput); 1732: } else { 1733: &Failure($client, "not_found\n", $userinput); 1734: } 1735: } else { 1736: &Failure($client, "rejected\n", $userinput); 1737: } 1738: return 1; 1739: } 1740: &register_handler("update", \&update_resource_handler, 0 ,1, 0); 1741: 1742: # 1743: # Fetch a user file from a remote server to the user's home directory 1744: # userfiles subdir. 1745: # Parameters: 1746: # $cmd - The command that got us here. 1747: # $tail - Tail of the command (remaining parameters). 1748: # $client - File descriptor connected to client. 1749: # Returns 1750: # 0 - Requested to exit, caller should shut down. 1751: # 1 - Continue processing. 1752: # 1753: sub fetch_user_file_handler { 1754: 1755: my ($cmd, $tail, $client) = @_; 1756: 1757: my $userinput = "$cmd:$tail"; 1758: my $fname = $tail; 1759: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|); 1760: my $udir=&propath($udom,$uname).'/userfiles'; 1761: unless (-e $udir) { 1762: mkdir($udir,0770); 1763: } 1764: Debug("fetch user file for $fname"); 1765: if (-e $udir) { 1766: $ufile=~s/^[\.\~]+//; 1767: 1768: # IF necessary, create the path right down to the file. 1769: # Note that any regular files in the way of this path are 1770: # wiped out to deal with some earlier folly of mine. 1771: 1772: my $path = $udir; 1773: if ($ufile =~m|(.+)/([^/]+)$|) { 1774: my @parts=split('/',$1); 1775: foreach my $part (@parts) { 1776: $path .= '/'.$part; 1777: if( -f $path) { 1778: unlink($path); 1779: } 1780: if ((-e $path)!=1) { 1781: mkdir($path,0770); 1782: } 1783: } 1784: } 1785: 1786: 1787: my $destname=$udir.'/'.$ufile; 1788: my $transname=$udir.'/'.$ufile.'.in.transit'; 1789: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname; 1790: my $response; 1791: Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname"); 1792: alarm(120); 1793: { 1794: my $ua=new LWP::UserAgent; 1795: my $request=new HTTP::Request('GET',"$remoteurl"); 1796: $response=$ua->request($request,$transname); 1797: } 1798: alarm(0); 1799: if ($response->is_error()) { 1800: unlink($transname); 1801: my $message=$response->status_line; 1802: &logthis("LWP GET: $message for $fname ($remoteurl)"); 1803: &Failure($client, "failed\n", $userinput); 1804: } else { 1805: Debug("Renaming $transname to $destname"); 1806: if (!rename($transname,$destname)) { 1807: &logthis("Unable to move $transname to $destname"); 1808: unlink($transname); 1809: &Failure($client, "failed\n", $userinput); 1810: } else { 1811: &Reply($client, "ok\n", $userinput); 1812: } 1813: } 1814: } else { 1815: &Failure($client, "not_home\n", $userinput); 1816: } 1817: return 1; 1818: } 1819: &register_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0); 1820: 1821: # 1822: # Remove a file from a user's home directory userfiles subdirectory. 1823: # Parameters: 1824: # cmd - the Lond request keyword that got us here. 1825: # tail - the part of the command past the keyword. 1826: # client- File descriptor connected with the client. 1827: # 1828: # Returns: 1829: # 1 - Continue processing. 1830: 1831: sub remove_user_file_handler { 1832: my ($cmd, $tail, $client) = @_; 1833: 1834: my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent. 1835: 1836: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|); 1837: if ($ufile =~m|/\.\./|) { 1838: # any files paths with /../ in them refuse 1839: # to deal with 1840: &Failure($client, "refused\n", "$cmd:$tail"); 1841: } else { 1842: my $udir = &propath($udom,$uname); 1843: if (-e $udir) { 1844: my $file=$udir.'/userfiles/'.$ufile; 1845: if (-e $file) { 1846: unlink($file); 1847: if (-e $file) { 1848: &Failure($client, "failed\n", "$cmd:$tail"); 1849: } else { 1850: &Reply($client, "ok\n", "$cmd:$tail"); 1851: } 1852: } else { 1853: &Failure($client, "not_found\n", "$cmd:$tail"); 1854: } 1855: } else { 1856: &Failure($client, "not_home\n", "$cmd:$tail"); 1857: } 1858: } 1859: return 1; 1860: } 1861: &register_handler("removeuserfile", \&remove_user_file_handler, 0,1,0); 1862: 1863: 1864: # 1865: # Authenticate access to a user file by checking the user's 1866: # session token(?) 1867: # 1868: # Parameters: 1869: # cmd - The request keyword that dispatched to tus. 1870: # tail - The tail of the request (colon separated parameters). 1871: # client - Filehandle open on the client. 1872: # Return: 1873: # 1. 1874: 1875: sub token_auth_user_file_handler { 1876: my ($cmd, $tail, $client) = @_; 1877: 1878: my ($fname, $session) = split(/:/, $tail); 1879: 1880: chomp($session); 1881: my $reply='non_auth'; 1882: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'. 1883: $session.'.id')) { 1884: while (my $line=<ENVIN>) { 1885: if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; } 1886: } 1887: close(ENVIN); 1888: &Reply($client, $reply); 1889: } else { 1890: &Failure($client, "invalid_token\n", "$cmd:$tail"); 1891: } 1892: return 1; 1893: 1894: } 1895: 1896: &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0); 1897: 1898: 1899: # 1900: # Unsubscribe from a resource. 1901: # 1902: # Parameters: 1903: # $cmd - The command that got us here. 1904: # $tail - Tail of the command (remaining parameters). 1905: # $client - File descriptor connected to client. 1906: # Returns 1907: # 0 - Requested to exit, caller should shut down. 1908: # 1 - Continue processing. 1909: # 1910: sub unsubscribe_handler { 1911: my ($cmd, $tail, $client) = @_; 1912: 1913: my $userinput= "$cmd:$tail"; 1914: 1915: my ($fname) = split(/:/,$tail); # Split in case there's extrs. 1916: 1917: &Debug("Unsubscribing $fname"); 1918: if (-e $fname) { 1919: &Debug("Exists"); 1920: &Reply($client, &unsub($fname,$clientip), $userinput); 1921: } else { 1922: &Failure($client, "not_found\n", $userinput); 1923: } 1924: return 1; 1925: } 1926: &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0); 1927: # Subscribe to a resource 1928: # 1929: # Parameters: 1930: # $cmd - The command that got us here. 1931: # $tail - Tail of the command (remaining parameters). 1932: # $client - File descriptor connected to client. 1933: # Returns 1934: # 0 - Requested to exit, caller should shut down. 1935: # 1 - Continue processing. 1936: # 1937: sub subscribe_handler { 1938: my ($cmd, $tail, $client)= @_; 1939: 1940: my $userinput = "$cmd:$tail"; 1941: 1942: &Reply( $client, &subscribe($userinput,$clientip), $userinput); 1943: 1944: return 1; 1945: } 1946: &register_handler("sub", \&subscribe_handler, 0, 1, 0); 1947: 1948: # 1949: # Determine the version of a resource (?) Or is it return 1950: # the top version of the resource? Not yet clear from the 1951: # code in currentversion. 1952: # 1953: # Parameters: 1954: # $cmd - The command that got us here. 1955: # $tail - Tail of the command (remaining parameters). 1956: # $client - File descriptor connected to client. 1957: # Returns 1958: # 0 - Requested to exit, caller should shut down. 1959: # 1 - Continue processing. 1960: # 1961: sub current_version_handler { 1962: my ($cmd, $tail, $client) = @_; 1963: 1964: my $userinput= "$cmd:$tail"; 1965: 1966: my $fname = $tail; 1967: &Reply( $client, &currentversion($fname)."\n", $userinput); 1968: return 1; 1969: 1970: } 1971: &register_handler("currentversion", \&current_version_handler, 0, 1, 0); 1972: 1973: # Make an entry in a user's activity log. 1974: # 1975: # Parameters: 1976: # $cmd - The command that got us here. 1977: # $tail - Tail of the command (remaining parameters). 1978: # $client - File descriptor connected to client. 1979: # Returns 1980: # 0 - Requested to exit, caller should shut down. 1981: # 1 - Continue processing. 1982: # 1983: sub activity_log_handler { 1984: my ($cmd, $tail, $client) = @_; 1985: 1986: 1987: my $userinput= "$cmd:$tail"; 1988: 1989: my ($udom,$uname,$what)=split(/:/,$tail); 1990: chomp($what); 1991: my $proname=&propath($udom,$uname); 1992: my $now=time; 1993: my $hfh; 1994: if ($hfh=IO::File->new(">>$proname/activity.log")) { 1995: print $hfh "$now:$clientname:$what\n"; 1996: &Reply( $client, "ok\n", $userinput); 1997: } else { 1998: &Failure($client, "error: ".($!+0)." IO::File->new Failed " 1999: ."while attempting log\n", 2000: $userinput); 2001: } 2002: 2003: return 1; 2004: } 2005: register_handler("log", \&activity_log_handler, 0, 1, 0); 2006: 2007: # 2008: # Put a namespace entry in a user profile hash. 2009: # My druthers would be for this to be an encrypted interaction too. 2010: # anything that might be an inadvertent covert channel about either 2011: # user authentication or user personal information.... 2012: # 2013: # Parameters: 2014: # $cmd - The command that got us here. 2015: # $tail - Tail of the command (remaining parameters). 2016: # $client - File descriptor connected to client. 2017: # Returns 2018: # 0 - Requested to exit, caller should shut down. 2019: # 1 - Continue processing. 2020: # 2021: sub put_user_profile_entry { 2022: my ($cmd, $tail, $client) = @_; 2023: 2024: my $userinput = "$cmd:$tail"; 2025: 2026: my ($udom,$uname,$namespace,$what) =split(/:/,$tail); 2027: if ($namespace ne 'roles') { 2028: chomp($what); 2029: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2030: &GDBM_WRCREAT(),"P",$what); 2031: if($hashref) { 2032: my @pairs=split(/\&/,$what); 2033: foreach my $pair (@pairs) { 2034: my ($key,$value)=split(/=/,$pair); 2035: $hashref->{$key}=$value; 2036: } 2037: if (untie(%$hashref)) { 2038: &Reply( $client, "ok\n", $userinput); 2039: } else { 2040: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ". 2041: "while attempting put\n", 2042: $userinput); 2043: } 2044: } else { 2045: &Failure( $client, "error: ".($!)." tie(GDBM) Failed ". 2046: "while attempting put\n", $userinput); 2047: } 2048: } else { 2049: &Failure( $client, "refused\n", $userinput); 2050: } 2051: 2052: return 1; 2053: } 2054: &register_handler("put", \&put_user_profile_entry, 0, 1, 0); 2055: 2056: # 2057: # Increment a profile entry in the user history file. 2058: # The history contains keyword value pairs. In this case, 2059: # The value itself is a pair of numbers. The first, the current value 2060: # the second an increment that this function applies to the current 2061: # value. 2062: # 2063: # Parameters: 2064: # $cmd - The command that got us here. 2065: # $tail - Tail of the command (remaining parameters). 2066: # $client - File descriptor connected to client. 2067: # Returns 2068: # 0 - Requested to exit, caller should shut down. 2069: # 1 - Continue processing. 2070: # 2071: sub increment_user_value_handler { 2072: my ($cmd, $tail, $client) = @_; 2073: 2074: my $userinput = "$cmd:$tail"; 2075: 2076: my ($udom,$uname,$namespace,$what) =split(/:/,$tail); 2077: if ($namespace ne 'roles') { 2078: chomp($what); 2079: my $hashref = &tie_user_hash($udom, $uname, 2080: $namespace, &GDBM_WRCREAT(), 2081: "P",$what); 2082: if ($hashref) { 2083: my @pairs=split(/\&/,$what); 2084: foreach my $pair (@pairs) { 2085: my ($key,$value)=split(/=/,$pair); 2086: # We could check that we have a number... 2087: if (! defined($value) || $value eq '') { 2088: $value = 1; 2089: } 2090: $hashref->{$key}+=$value; 2091: } 2092: if (untie(%$hashref)) { 2093: &Reply( $client, "ok\n", $userinput); 2094: } else { 2095: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ". 2096: "while attempting inc\n", $userinput); 2097: } 2098: } else { 2099: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2100: "while attempting inc\n", $userinput); 2101: } 2102: } else { 2103: &Failure($client, "refused\n", $userinput); 2104: } 2105: 2106: return 1; 2107: } 2108: &register_handler("inc", \&increment_user_value_handler, 0, 1, 0); 2109: 2110: 2111: # 2112: # Put a new role for a user. Roles are LonCAPA's packaging of permissions. 2113: # Each 'role' a user has implies a set of permissions. Adding a new role 2114: # for a person grants the permissions packaged with that role 2115: # to that user when the role is selected. 2116: # 2117: # Parameters: 2118: # $cmd - The command string (rolesput). 2119: # $tail - The remainder of the request line. For rolesput this 2120: # consists of a colon separated list that contains: 2121: # The domain and user that is granting the role (logged). 2122: # The domain and user that is getting the role. 2123: # The roles being granted as a set of & separated pairs. 2124: # each pair a key value pair. 2125: # $client - File descriptor connected to the client. 2126: # Returns: 2127: # 0 - If the daemon should exit 2128: # 1 - To continue processing. 2129: # 2130: # 2131: sub roles_put_handler { 2132: my ($cmd, $tail, $client) = @_; 2133: 2134: my $userinput = "$cmd:$tail"; 2135: 2136: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail); 2137: 2138: 2139: my $namespace='roles'; 2140: chomp($what); 2141: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2142: &GDBM_WRCREAT(), "P", 2143: "$exedom:$exeuser:$what"); 2144: # 2145: # Log the attempt to set a role. The {}'s here ensure that the file 2146: # handle is open for the minimal amount of time. Since the flush 2147: # is done on close this improves the chances the log will be an un- 2148: # corrupted ordered thing. 2149: if ($hashref) { 2150: my @pairs=split(/\&/,$what); 2151: foreach my $pair (@pairs) { 2152: my ($key,$value)=split(/=/,$pair); 2153: &manage_permissions($key, $udom, $uname, 2154: &get_auth_type( $udom, $uname)); 2155: $hashref->{$key}=$value; 2156: } 2157: if (untie($hashref)) { 2158: &Reply($client, "ok\n", $userinput); 2159: } else { 2160: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 2161: "while attempting rolesput\n", $userinput); 2162: } 2163: } else { 2164: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2165: "while attempting rolesput\n", $userinput); 2166: } 2167: return 1; 2168: } 2169: &register_handler("rolesput", \&roles_put_handler, 1,1,0); # Encoded client only. 2170: 2171: # 2172: # Deletes (removes) a role for a user. This is equivalent to removing 2173: # a permissions package associated with the role from the user's profile. 2174: # 2175: # Parameters: 2176: # $cmd - The command (rolesdel) 2177: # $tail - The remainder of the request line. This consists 2178: # of: 2179: # The domain and user requesting the change (logged) 2180: # The domain and user being changed. 2181: # The roles being revoked. These are shipped to us 2182: # as a bunch of & separated role name keywords. 2183: # $client - The file handle open on the client. 2184: # Returns: 2185: # 1 - Continue processing 2186: # 0 - Exit. 2187: # 2188: sub roles_delete_handler { 2189: my ($cmd, $tail, $client) = @_; 2190: 2191: my $userinput = "$cmd:$tail"; 2192: 2193: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail); 2194: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom. 2195: "what = ".$what); 2196: my $namespace='roles'; 2197: chomp($what); 2198: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2199: &GDBM_WRCREAT(), "D", 2200: "$exedom:$exeuser:$what"); 2201: 2202: if ($hashref) { 2203: my @rolekeys=split(/\&/,$what); 2204: 2205: foreach my $key (@rolekeys) { 2206: delete $hashref->{$key}; 2207: } 2208: if (untie(%$hashref)) { 2209: &Reply($client, "ok\n", $userinput); 2210: } else { 2211: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 2212: "while attempting rolesdel\n", $userinput); 2213: } 2214: } else { 2215: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2216: "while attempting rolesdel\n", $userinput); 2217: } 2218: 2219: return 1; 2220: } 2221: &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only 2222: 2223: # Unencrypted get from a user's profile database. See 2224: # GetProfileEntryEncrypted for a version that does end-to-end encryption. 2225: # This function retrieves a keyed item from a specific named database in the 2226: # user's directory. 2227: # 2228: # Parameters: 2229: # $cmd - Command request keyword (get). 2230: # $tail - Tail of the command. This is a colon separated list 2231: # consisting of the domain and username that uniquely 2232: # identifies the profile, 2233: # The 'namespace' which selects the gdbm file to 2234: # do the lookup in, 2235: # & separated list of keys to lookup. Note that 2236: # the values are returned as an & separated list too. 2237: # $client - File descriptor open on the client. 2238: # Returns: 2239: # 1 - Continue processing. 2240: # 0 - Exit. 2241: # 2242: sub get_profile_entry { 2243: my ($cmd, $tail, $client) = @_; 2244: 2245: my $userinput= "$cmd:$tail"; 2246: 2247: my ($udom,$uname,$namespace,$what) = split(/:/,$tail); 2248: chomp($what); 2249: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2250: &GDBM_READER()); 2251: if ($hashref) { 2252: my @queries=split(/\&/,$what); 2253: my $qresult=''; 2254: 2255: for (my $i=0;$i<=$#queries;$i++) { 2256: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string. 2257: } 2258: $qresult=~s/\&$//; # Remove trailing & from last lookup. 2259: if (untie(%$hashref)) { 2260: &Reply($client, "$qresult\n", $userinput); 2261: } else { 2262: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2263: "while attempting get\n", $userinput); 2264: } 2265: } else { 2266: if ($!+0 == 2) { # +0 coerces errno -> number 2 is ENOENT 2267: &Failure($client, "error:No such file or ". 2268: "GDBM reported bad block error\n", $userinput); 2269: } else { # Some other undifferentiated err. 2270: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2271: "while attempting get\n", $userinput); 2272: } 2273: } 2274: return 1; 2275: } 2276: &register_handler("get", \&get_profile_entry, 0,1,0); 2277: 2278: # 2279: # Process the encrypted get request. Note that the request is sent 2280: # in clear, but the reply is encrypted. This is a small covert channel: 2281: # information about the sensitive keys is given to the snooper. Just not 2282: # information about the values of the sensitive key. Hmm if I wanted to 2283: # know these I'd snoop for the egets. Get the profile item names from them 2284: # and then issue a get for them since there's no enforcement of the 2285: # requirement of an encrypted get for particular profile items. If I 2286: # were re-doing this, I'd force the request to be encrypted as well as the 2287: # reply. I'd also just enforce encrypted transactions for all gets since 2288: # that would prevent any covert channel snooping. 2289: # 2290: # Parameters: 2291: # $cmd - Command keyword of request (eget). 2292: # $tail - Tail of the command. See GetProfileEntry # for more information about this. 2293: # $client - File open on the client. 2294: # Returns: 2295: # 1 - Continue processing 2296: # 0 - server should exit. 2297: sub get_profile_entry_encrypted { 2298: my ($cmd, $tail, $client) = @_; 2299: 2300: my $userinput = "$cmd:$tail"; 2301: 2302: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput); 2303: chomp($what); 2304: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2305: &GDBM_READER()); 2306: if ($hashref) { 2307: my @queries=split(/\&/,$what); 2308: my $qresult=''; 2309: for (my $i=0;$i<=$#queries;$i++) { 2310: $qresult.="$hashref->{$queries[$i]}&"; 2311: } 2312: if (untie(%$hashref)) { 2313: $qresult=~s/\&$//; 2314: if ($cipher) { 2315: my $cmdlength=length($qresult); 2316: $qresult.=" "; 2317: my $encqresult=''; 2318: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) { 2319: $encqresult.= unpack("H16", 2320: $cipher->encrypt(substr($qresult, 2321: $encidx, 2322: 8))); 2323: } 2324: &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput); 2325: } else { 2326: &Failure( $client, "error:no_key\n", $userinput); 2327: } 2328: } else { 2329: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2330: "while attempting eget\n", $userinput); 2331: } 2332: } else { 2333: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2334: "while attempting eget\n", $userinput); 2335: } 2336: 2337: return 1; 2338: } 2339: &register_handler("eget", \&GetProfileEntryEncrypted, 0, 1, 0); 2340: # 2341: # Deletes a key in a user profile database. 2342: # 2343: # Parameters: 2344: # $cmd - Command keyword (del). 2345: # $tail - Command tail. IN this case a colon 2346: # separated list containing: 2347: # The domain and user that identifies uniquely 2348: # the identity of the user. 2349: # The profile namespace (name of the profile 2350: # database file). 2351: # & separated list of keywords to delete. 2352: # $client - File open on client socket. 2353: # Returns: 2354: # 1 - Continue processing 2355: # 0 - Exit server. 2356: # 2357: # 2358: 2359: sub delete_profile_entry { 2360: my ($cmd, $tail, $client) = @_; 2361: 2362: my $userinput = "cmd:$tail"; 2363: 2364: my ($udom,$uname,$namespace,$what) = split(/:/,$tail); 2365: chomp($what); 2366: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2367: &GDBM_WRCREAT(), 2368: "D",$what); 2369: if ($hashref) { 2370: my @keys=split(/\&/,$what); 2371: foreach my $key (@keys) { 2372: delete($hashref->{$key}); 2373: } 2374: if (untie(%$hashref)) { 2375: &Reply($client, "ok\n", $userinput); 2376: } else { 2377: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2378: "while attempting del\n", $userinput); 2379: } 2380: } else { 2381: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2382: "while attempting del\n", $userinput); 2383: } 2384: return 1; 2385: } 2386: &register_handler("del", \&delete_profile_entry, 0, 1, 0); 2387: # 2388: # List the set of keys that are defined in a profile database file. 2389: # A successful reply from this will contain an & separated list of 2390: # the keys. 2391: # Parameters: 2392: # $cmd - Command request (keys). 2393: # $tail - Remainder of the request, a colon separated 2394: # list containing domain/user that identifies the 2395: # user being queried, and the database namespace 2396: # (database filename essentially). 2397: # $client - File open on the client. 2398: # Returns: 2399: # 1 - Continue processing. 2400: # 0 - Exit the server. 2401: # 2402: sub get_profile_keys { 2403: my ($cmd, $tail, $client) = @_; 2404: 2405: my $userinput = "$cmd:$tail"; 2406: 2407: my ($udom,$uname,$namespace)=split(/:/,$tail); 2408: my $qresult=''; 2409: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2410: &GDBM_READER()); 2411: if ($hashref) { 2412: foreach my $key (keys %$hashref) { 2413: $qresult.="$key&"; 2414: } 2415: if (untie(%$hashref)) { 2416: $qresult=~s/\&$//; 2417: &Reply($client, "$qresult\n", $userinput); 2418: } else { 2419: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2420: "while attempting keys\n", $userinput); 2421: } 2422: } else { 2423: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2424: "while attempting keys\n", $userinput); 2425: } 2426: 2427: return 1; 2428: } 2429: &register_handler("keys", \&get_profile_keys, 0, 1, 0); 2430: 2431: # 2432: # Dump the contents of a user profile database. 2433: # Note that this constitutes a very large covert channel too since 2434: # the dump will return sensitive information that is not encrypted. 2435: # The naive security assumption is that the session negotiation ensures 2436: # our client is trusted and I don't believe that's assured at present. 2437: # Sure want badly to go to ssl or tls. Of course if my peer isn't really 2438: # a LonCAPA node they could have negotiated an encryption key too so >sigh<. 2439: # 2440: # Parameters: 2441: # $cmd - The command request keyword (currentdump). 2442: # $tail - Remainder of the request, consisting of a colon 2443: # separated list that has the domain/username and 2444: # the namespace to dump (database file). 2445: # $client - file open on the remote client. 2446: # Returns: 2447: # 1 - Continue processing. 2448: # 0 - Exit the server. 2449: # 2450: sub dump_profile_database { 2451: my ($cmd, $tail, $client) = @_; 2452: 2453: my $userinput = "$cmd:$tail"; 2454: 2455: my ($udom,$uname,$namespace) = split(/:/,$tail); 2456: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2457: &GDBM_READER()); 2458: if ($hashref) { 2459: # Structure of %data: 2460: # $data{$symb}->{$parameter}=$value; 2461: # $data{$symb}->{'v.'.$parameter}=$version; 2462: # since $parameter will be unescaped, we do not 2463: # have to worry about silly parameter names... 2464: 2465: my $qresult=''; 2466: my %data = (); # A hash of anonymous hashes.. 2467: while (my ($key,$value) = each(%$hashref)) { 2468: my ($v,$symb,$param) = split(/:/,$key); 2469: next if ($v eq 'version' || $symb eq 'keys'); 2470: next if (exists($data{$symb}) && 2471: exists($data{$symb}->{$param}) && 2472: $data{$symb}->{'v.'.$param} > $v); 2473: $data{$symb}->{$param}=$value; 2474: $data{$symb}->{'v.'.$param}=$v; 2475: } 2476: if (untie(%$hashref)) { 2477: while (my ($symb,$param_hash) = each(%data)) { 2478: while(my ($param,$value) = each (%$param_hash)){ 2479: next if ($param =~ /^v\./); # Ignore versions... 2480: # 2481: # Just dump the symb=value pairs separated by & 2482: # 2483: $qresult.=$symb.':'.$param.'='.$value.'&'; 2484: } 2485: } 2486: chop($qresult); 2487: &Reply($client , "$qresult\n", $userinput); 2488: } else { 2489: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 2490: "while attempting currentdump\n", $userinput); 2491: } 2492: } else { 2493: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2494: "while attempting currentdump\n", $userinput); 2495: } 2496: 2497: return 1; 2498: } 2499: &register_handler("currentdump", \&dump_profile_database, 0, 1, 0); 2500: 2501: # 2502: # Dump a profile database with an optional regular expression 2503: # to match against the keys. In this dump, no effort is made 2504: # to separate symb from version information. Presumably the 2505: # databases that are dumped by this command are of a different 2506: # structure. Need to look at this and improve the documentation of 2507: # both this and the currentdump handler. 2508: # Parameters: 2509: # $cmd - The command keyword. 2510: # $tail - All of the characters after the $cmd: 2511: # These are expected to be a colon 2512: # separated list containing: 2513: # domain/user - identifying the user. 2514: # namespace - identifying the database. 2515: # regexp - optional regular expression 2516: # that is matched against 2517: # database keywords to do 2518: # selective dumps. 2519: # $client - Channel open on the client. 2520: # Returns: 2521: # 1 - Continue processing. 2522: # Side effects: 2523: # response is written to $client. 2524: # 2525: sub dump_with_regexp { 2526: my ($cmd, $tail, $client) = @_; 2527: 2528: 2529: my $userinput = "$cmd:$tail"; 2530: 2531: my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail); 2532: if (defined($regexp)) { 2533: $regexp=&unescape($regexp); 2534: } else { 2535: $regexp='.'; 2536: } 2537: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2538: &GDBM_READER()); 2539: if ($hashref) { 2540: my $qresult=''; 2541: while (my ($key,$value) = each(%$hashref)) { 2542: if ($regexp eq '.') { 2543: $qresult.=$key.'='.$value.'&'; 2544: } else { 2545: my $unescapeKey = &unescape($key); 2546: if (eval('$unescapeKey=~/$regexp/')) { 2547: $qresult.="$key=$value&"; 2548: } 2549: } 2550: } 2551: if (untie(%$hashref)) { 2552: chop($qresult); 2553: &Reply($client, "$qresult\n", $userinput); 2554: } else { 2555: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 2556: "while attempting dump\n", $userinput); 2557: } 2558: } else { 2559: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2560: "while attempting dump\n", $userinput); 2561: } 2562: 2563: return 1; 2564: } 2565: 2566: &register_handler("dump", \&dump_with_regexp, 0, 1, 0); 2567: 2568: # Store a set of key=value pairs associated with a versioned name. 2569: # 2570: # Parameters: 2571: # $cmd - Request command keyword. 2572: # $tail - Tail of the request. This is a colon 2573: # separated list containing: 2574: # domain/user - User and authentication domain. 2575: # namespace - Name of the database being modified 2576: # rid - Resource keyword to modify. 2577: # what - new value associated with rid. 2578: # 2579: # $client - Socket open on the client. 2580: # 2581: # 2582: # Returns: 2583: # 1 (keep on processing). 2584: # Side-Effects: 2585: # Writes to the client 2586: sub store_handler { 2587: my ($cmd, $tail, $client) = @_; 2588: 2589: my $userinput = "$cmd:$tail"; 2590: 2591: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail); 2592: if ($namespace ne 'roles') { 2593: 2594: chomp($what); 2595: my @pairs=split(/\&/,$what); 2596: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2597: &GDBM_WRCREAT(), "P", 2598: "$rid:$what"); 2599: if ($hashref) { 2600: my $now = time; 2601: my @previouskeys=split(/&/,$hashref->{"keys:$rid"}); 2602: my $key; 2603: $hashref->{"version:$rid"}++; 2604: my $version=$hashref->{"version:$rid"}; 2605: my $allkeys=''; 2606: foreach my $pair (@pairs) { 2607: my ($key,$value)=split(/=/,$pair); 2608: $allkeys.=$key.':'; 2609: $hashref->{"$version:$rid:$key"}=$value; 2610: } 2611: $hashref->{"$version:$rid:timestamp"}=$now; 2612: $allkeys.='timestamp'; 2613: $hashref->{"$version:keys:$rid"}=$allkeys; 2614: if (untie($hashref)) { 2615: &Reply($client, "ok\n", $userinput); 2616: } else { 2617: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2618: "while attempting store\n", $userinput); 2619: } 2620: } else { 2621: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2622: "while attempting store\n", $userinput); 2623: } 2624: } else { 2625: &Failure($client, "refused\n", $userinput); 2626: } 2627: 2628: return 1; 2629: } 2630: &register_handler("store", \&store_handler, 0, 1, 0); 2631: # 2632: # Dump out all versions of a resource that has key=value pairs associated 2633: # with it for each version. These resources are built up via the store 2634: # command. 2635: # 2636: # Parameters: 2637: # $cmd - Command keyword. 2638: # $tail - Remainder of the request which consists of: 2639: # domain/user - User and auth. domain. 2640: # namespace - name of resource database. 2641: # rid - Resource id. 2642: # $client - socket open on the client. 2643: # 2644: # Returns: 2645: # 1 indicating the caller should not yet exit. 2646: # Side-effects: 2647: # Writes a reply to the client. 2648: # The reply is a string of the following shape: 2649: # version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2... 2650: # Where the 1 above represents version 1. 2651: # this continues for all pairs of keys in all versions. 2652: # 2653: # 2654: # 2655: # 2656: sub restore_handler { 2657: my ($cmd, $tail, $client) = @_; 2658: 2659: my $userinput = "$cmd:$tail"; # Only used for logging purposes. 2660: 2661: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput); 2662: $namespace=~s/\//\_/g; 2663: $namespace=~s/\W//g; 2664: chomp($rid); 2665: my $proname=&propath($udom,$uname); 2666: my $qresult=''; 2667: my %hash; 2668: if (tie(%hash,'GDBM_File',"$proname/$namespace.db", 2669: &GDBM_READER(),0640)) { 2670: my $version=$hash{"version:$rid"}; 2671: $qresult.="version=$version&"; 2672: my $scope; 2673: for ($scope=1;$scope<=$version;$scope++) { 2674: my $vkeys=$hash{"$scope:keys:$rid"}; 2675: my @keys=split(/:/,$vkeys); 2676: my $key; 2677: $qresult.="$scope:keys=$vkeys&"; 2678: foreach $key (@keys) { 2679: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&"; 2680: } 2681: } 2682: if (untie(%hash)) { 2683: $qresult=~s/\&$//; 2684: &Reply( $client, "$qresult\n", $userinput); 2685: } else { 2686: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2687: "while attempting restore\n", $userinput); 2688: } 2689: } else { 2690: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2691: "while attempting restore\n", $userinput); 2692: } 2693: 2694: return 1; 2695: 2696: 2697: } 2698: &register_handler("restore", \&restore_handler, 0,1,0); 2699: 2700: # 2701: # Add a chat message to to a discussion board. 2702: # 2703: # Parameters: 2704: # $cmd - Request keyword. 2705: # $tail - Tail of the command. A colon separated list 2706: # containing: 2707: # cdom - Domain on which the chat board lives 2708: # cnum - Identifier of the discussion group. 2709: # post - Body of the posting. 2710: # $client - Socket open on the client. 2711: # Returns: 2712: # 1 - Indicating caller should keep on processing. 2713: # 2714: # Side-effects: 2715: # writes a reply to the client. 2716: # 2717: # 2718: sub send_chat_handler { 2719: my ($cmd, $tail, $client) = @_; 2720: 2721: 2722: my $userinput = "$cmd:$tail"; 2723: 2724: my ($cdom,$cnum,$newpost)=split(/\:/,$tail); 2725: &chat_add($cdom,$cnum,$newpost); 2726: &Reply($client, "ok\n", $userinput); 2727: 2728: return 1; 2729: } 2730: &register_handler("chatsend", \&send_chat_handler, 0, 1, 0); 2731: # 2732: # Retrieve the set of chat messagss from a discussion board. 2733: # 2734: # Parameters: 2735: # $cmd - Command keyword that initiated the request. 2736: # $tail - Remainder of the request after the command 2737: # keyword. In this case a colon separated list of 2738: # chat domain - Which discussion board. 2739: # chat id - Discussion thread(?) 2740: # domain/user - Authentication domain and username 2741: # of the requesting person. 2742: # $client - Socket open on the client program. 2743: # Returns: 2744: # 1 - continue processing 2745: # Side effects: 2746: # Response is written to the client. 2747: # 2748: sub retrieve_chat_handler { 2749: my ($cmd, $tail, $client) = @_; 2750: 2751: 2752: my $userinput = "$cmd:$tail"; 2753: 2754: my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail); 2755: my $reply=''; 2756: foreach (&get_chat($cdom,$cnum,$udom,$uname)) { 2757: $reply.=&escape($_).':'; 2758: } 2759: $reply=~s/\:$//; 2760: &Reply($client, $reply."\n", $userinput); 2761: 2762: 2763: return 1; 2764: } 2765: &register_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0); 2766: 2767: # 2768: # Initiate a query of an sql database. SQL query repsonses get put in 2769: # a file for later retrieval. This prevents sql query results from 2770: # bottlenecking the system. Note that with loncnew, perhaps this is 2771: # less of an issue since multiple outstanding requests can be concurrently 2772: # serviced. 2773: # 2774: # Parameters: 2775: # $cmd - COmmand keyword that initiated the request. 2776: # $tail - Remainder of the command after the keyword. 2777: # For this function, this consists of a query and 2778: # 3 arguments that are self-documentingly labelled 2779: # in the original arg1, arg2, arg3. 2780: # $client - Socket open on the client. 2781: # Return: 2782: # 1 - Indicating processing should continue. 2783: # Side-effects: 2784: # a reply is written to $client. 2785: # 2786: sub send_query_handler { 2787: my ($cmd, $tail, $client) = @_; 2788: 2789: 2790: my $userinput = "$cmd:$tail"; 2791: 2792: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail); 2793: $query=~s/\n*$//g; 2794: &Reply($client, "". &sql_reply("$clientname\&$query". 2795: "\&$arg1"."\&$arg2"."\&$arg3")."\n", 2796: $userinput); 2797: 2798: return 1; 2799: } 2800: &register_handler("querysend", \&send_query_handler, 0, 1, 0); 2801: 2802: # 2803: # Add a reply to an sql query. SQL queries are done asyncrhonously. 2804: # The query is submitted via a "querysend" transaction. 2805: # There it is passed on to the lonsql daemon, queued and issued to 2806: # mysql. 2807: # This transaction is invoked when the sql transaction is complete 2808: # it stores the query results in flie and indicates query completion. 2809: # presumably local software then fetches this response... I'm guessing 2810: # the sequence is: lonc does a querysend, we ask lonsql to do it. 2811: # lonsql on completion of the query interacts with the lond of our 2812: # client to do a query reply storing two files: 2813: # - id - The results of the query. 2814: # - id.end - Indicating the transaction completed. 2815: # NOTE: id is a unique id assigned to the query and querysend time. 2816: # Parameters: 2817: # $cmd - Command keyword that initiated this request. 2818: # $tail - Remainder of the tail. In this case that's a colon 2819: # separated list containing the query Id and the 2820: # results of the query. 2821: # $client - Socket open on the client. 2822: # Return: 2823: # 1 - Indicating that we should continue processing. 2824: # Side effects: 2825: # ok written to the client. 2826: # 2827: sub reply_query_handler { 2828: my ($cmd, $tail, $client) = @_; 2829: 2830: 2831: my $userinput = "$cmd:$tail"; 2832: 2833: my ($cmd,$id,$reply)=split(/:/,$userinput); 2834: my $store; 2835: my $execdir=$perlvar{'lonDaemons'}; 2836: if ($store=IO::File->new(">$execdir/tmp/$id")) { 2837: $reply=~s/\&/\n/g; 2838: print $store $reply; 2839: close $store; 2840: my $store2=IO::File->new(">$execdir/tmp/$id.end"); 2841: print $store2 "done\n"; 2842: close $store2; 2843: &Reply($client, "ok\n", $userinput); 2844: } else { 2845: &Failure($client, "error: ".($!+0) 2846: ." IO::File->new Failed ". 2847: "while attempting queryreply\n", $userinput); 2848: } 2849: 2850: 2851: return 1; 2852: } 2853: &register_handler("queryreply", \&reply_query_handler, 0, 1, 0); 2854: 2855: # 2856: # Process the courseidput request. Not quite sure what this means 2857: # at the system level sense. It appears a gdbm file in the 2858: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and 2859: # a set of entries made in that database. 2860: # 2861: # Parameters: 2862: # $cmd - The command keyword that initiated this request. 2863: # $tail - Tail of the command. In this case consists of a colon 2864: # separated list contaning the domain to apply this to and 2865: # an ampersand separated list of keyword=value pairs. 2866: # $client - Socket open on the client. 2867: # Returns: 2868: # 1 - indicating that processing should continue 2869: # 2870: # Side effects: 2871: # reply is written to the client. 2872: # 2873: sub put_course_id_handler { 2874: my ($cmd, $tail, $client) = @_; 2875: 2876: 2877: my $userinput = "$cmd:$tail"; 2878: 2879: my ($udom, $what) = split(/:/, $tail); 2880: chomp($what); 2881: my $now=time; 2882: my @pairs=split(/\&/,$what); 2883: 2884: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT()); 2885: if ($hashref) { 2886: foreach my $pair (@pairs) { 2887: my ($key,$value)=split(/=/,$pair); 2888: $hashref->{$key}=$value.':'.$now; 2889: } 2890: if (untie(%$hashref)) { 2891: &Reply($client, "ok\n", $userinput); 2892: } else { 2893: &Failure( $client, "error: ".($!+0) 2894: ." untie(GDBM) Failed ". 2895: "while attempting courseidput\n", $userinput); 2896: } 2897: } else { 2898: &Failure( $client, "error: ".($!+0) 2899: ." tie(GDBM) Failed ". 2900: "while attempting courseidput\n", $userinput); 2901: } 2902: 2903: return 1; 2904: } 2905: &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0); 2906: 2907: # Retrieves the value of a course id resource keyword pattern 2908: # defined since a starting date. Both the starting date and the 2909: # keyword pattern are optional. If the starting date is not supplied it 2910: # is treated as the beginning of time. If the pattern is not found, 2911: # it is treatred as "." matching everything. 2912: # 2913: # Parameters: 2914: # $cmd - Command keyword that resulted in us being dispatched. 2915: # $tail - The remainder of the command that, in this case, consists 2916: # of a colon separated list of: 2917: # domain - The domain in which the course database is 2918: # defined. 2919: # since - Optional parameter describing the minimum 2920: # time of definition(?) of the resources that 2921: # will match the dump. 2922: # description - regular expression that is used to filter 2923: # the dump. Only keywords matching this regexp 2924: # will be used. 2925: # $client - The socket open on the client. 2926: # Returns: 2927: # 1 - Continue processing. 2928: # Side Effects: 2929: # a reply is written to $client. 2930: sub dump_course_id_handler { 2931: my ($cmd, $tail, $client) = @_; 2932: 2933: my $userinput = "$cmd:$tail"; 2934: 2935: my ($udom,$since,$description) =split(/:/,$tail); 2936: if (defined($description)) { 2937: $description=&unescape($description); 2938: } else { 2939: $description='.'; 2940: } 2941: unless (defined($since)) { $since=0; } 2942: my $qresult=''; 2943: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT()); 2944: if ($hashref) { 2945: while (my ($key,$value) = each(%$hashref)) { 2946: my ($descr,$lasttime,$inst_code); 2947: if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) { 2948: ($descr,$inst_code,$lasttime)=($1,$2,$3); 2949: } else { 2950: ($descr,$lasttime) = split(/\:/,$value); 2951: } 2952: if ($lasttime<$since) { next; } 2953: if ($description eq '.') { 2954: $qresult.=$key.'='.$descr.':'.$inst_code.'&'; 2955: } else { 2956: my $unescapeVal = &unescape($descr); 2957: if (eval('$unescapeVal=~/\Q$description\E/i')) { 2958: $qresult.=$key.'='.$descr.':'.$inst_code.'&'; 2959: } 2960: } 2961: } 2962: if (untie(%$hashref)) { 2963: chop($qresult); 2964: &Reply($client, "$qresult\n", $userinput); 2965: } else { 2966: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2967: "while attempting courseiddump\n", $userinput); 2968: } 2969: } else { 2970: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2971: "while attempting courseiddump\n", $userinput); 2972: } 2973: 2974: 2975: return 1; 2976: } 2977: &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0); 2978: # 2979: # 2980: # 2981: #--------------------------------------------------------------- 2982: # 2983: # Getting, decoding and dispatching requests: 2984: # 2985: 2986: # 2987: # Get a Request: 2988: # Gets a Request message from the client. The transaction 2989: # is defined as a 'line' of text. We remove the new line 2990: # from the text line. 2991: # 2992: sub get_request { 2993: my $input = <$client>; 2994: chomp($input); 2995: 2996: &Debug("get_request: Request = $input\n"); 2997: 2998: &status('Processing '.$clientname.':'.$input); 2999: 3000: return $input; 3001: } 3002: #--------------------------------------------------------------- 3003: # 3004: # Process a request. This sub should shrink as each action 3005: # gets farmed out into a separat sub that is registered 3006: # with the dispatch hash. 3007: # 3008: # Parameters: 3009: # user_input - The request received from the client (lonc). 3010: # Returns: 3011: # true to keep processing, false if caller should exit. 3012: # 3013: sub process_request { 3014: my ($userinput) = @_; # Easier for now to break style than to 3015: # fix all the userinput -> user_input. 3016: my $wasenc = 0; # True if request was encrypted. 3017: # ------------------------------------------------------------ See if encrypted 3018: if ($userinput =~ /^enc/) { 3019: $userinput = decipher($userinput); 3020: $wasenc=1; 3021: if(!$userinput) { # Cipher not defined. 3022: &Failure($client, "error: Encrypted data without negotated key"); 3023: return 0; 3024: } 3025: } 3026: Debug("process_request: $userinput\n"); 3027: 3028: # 3029: # The 'correct way' to add a command to lond is now to 3030: # write a sub to execute it and Add it to the command dispatch 3031: # hash via a call to register_handler.. The comments to that 3032: # sub should give you enough to go on to show how to do this 3033: # along with the examples that are building up as this code 3034: # is getting refactored. Until all branches of the 3035: # if/elseif monster below have been factored out into 3036: # separate procesor subs, if the dispatch hash is missing 3037: # the command keyword, we will fall through to the remainder 3038: # of the if/else chain below in order to keep this thing in 3039: # working order throughout the transmogrification. 3040: 3041: my ($command, $tail) = split(/:/, $userinput, 2); 3042: chomp($command); 3043: chomp($tail); 3044: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet. 3045: $command =~ s/(\r)//; # And this too for parameterless commands. 3046: if(!$tail) { 3047: $tail =""; # defined but blank. 3048: } 3049: 3050: &Debug("Command received: $command, encoded = $wasenc"); 3051: 3052: if(defined $Dispatcher{$command}) { 3053: 3054: my $dispatch_info = $Dispatcher{$command}; 3055: my $handler = $$dispatch_info[0]; 3056: my $need_encode = $$dispatch_info[1]; 3057: my $client_types = $$dispatch_info[2]; 3058: Debug("Matched dispatch hash: mustencode: $need_encode " 3059: ."ClientType $client_types"); 3060: 3061: # Validate the request: 3062: 3063: my $ok = 1; 3064: my $requesterprivs = 0; 3065: if(&isClient()) { 3066: $requesterprivs |= $CLIENT_OK; 3067: } 3068: if(&isManager()) { 3069: $requesterprivs |= $MANAGER_OK; 3070: } 3071: if($need_encode && (!$wasenc)) { 3072: Debug("Must encode but wasn't: $need_encode $wasenc"); 3073: $ok = 0; 3074: } 3075: if(($client_types & $requesterprivs) == 0) { 3076: Debug("Client not privileged to do this operation"); 3077: $ok = 0; 3078: } 3079: 3080: if($ok) { 3081: Debug("Dispatching to handler $command $tail"); 3082: my $keep_going = &$handler($command, $tail, $client); 3083: return $keep_going; 3084: } else { 3085: Debug("Refusing to dispatch because client did not match requirements"); 3086: Failure($client, "refused\n", $userinput); 3087: return 1; 3088: } 3089: 3090: } 3091: 3092: #------------------- Commands not yet in spearate handlers. -------------- 3093: 3094: 3095: # ----------------------------------------------------------------------- idput 3096: if ($userinput =~ /^idput/) { 3097: if(isClient) { 3098: my ($cmd,$udom,$what)=split(/:/,$userinput); 3099: chomp($what); 3100: $udom=~s/\W//g; 3101: my $proname="$perlvar{'lonUsersDir'}/$udom/ids"; 3102: my $now=time; 3103: my @pairs=split(/\&/,$what); 3104: my %hash; 3105: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) { 3106: { 3107: my $hfh; 3108: if ($hfh=IO::File->new(">>$proname.hist")) { 3109: print $hfh "P:$now:$what\n"; 3110: } 3111: } 3112: foreach my $pair (@pairs) { 3113: my ($key,$value)=split(/=/,$pair); 3114: $hash{$key}=$value; 3115: } 3116: if (untie(%hash)) { 3117: print $client "ok\n"; 3118: } else { 3119: print $client "error: ".($!+0) 3120: ." untie(GDBM) Failed ". 3121: "while attempting idput\n"; 3122: } 3123: } else { 3124: print $client "error: ".($!+0) 3125: ." tie(GDBM) Failed ". 3126: "while attempting idput\n"; 3127: } 3128: } else { 3129: Reply($client, "refused\n", $userinput); 3130: 3131: } 3132: # ----------------------------------------------------------------------- idget 3133: } elsif ($userinput =~ /^idget/) { 3134: if(isClient) { 3135: my ($cmd,$udom,$what)=split(/:/,$userinput); 3136: chomp($what); 3137: $udom=~s/\W//g; 3138: my $proname="$perlvar{'lonUsersDir'}/$udom/ids"; 3139: my @queries=split(/\&/,$what); 3140: my $qresult=''; 3141: my %hash; 3142: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) { 3143: for (my $i=0;$i<=$#queries;$i++) { 3144: $qresult.="$hash{$queries[$i]}&"; 3145: } 3146: if (untie(%hash)) { 3147: $qresult=~s/\&$//; 3148: print $client "$qresult\n"; 3149: } else { 3150: print $client "error: ".($!+0) 3151: ." untie(GDBM) Failed ". 3152: "while attempting idget\n"; 3153: } 3154: } else { 3155: print $client "error: ".($!+0) 3156: ." tie(GDBM) Failed ". 3157: "while attempting idget\n"; 3158: } 3159: } else { 3160: Reply($client, "refused\n", $userinput); 3161: 3162: } 3163: # ---------------------------------------------------------------------- tmpput 3164: } elsif ($userinput =~ /^tmpput/) { 3165: if(isClient) { 3166: my ($cmd,$what)=split(/:/,$userinput); 3167: my $store; 3168: $tmpsnum++; 3169: my $id=$$.'_'.$clientip.'_'.$tmpsnum; 3170: $id=~s/\W/\_/g; 3171: $what=~s/\n//g; 3172: my $execdir=$perlvar{'lonDaemons'}; 3173: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) { 3174: print $store $what; 3175: close $store; 3176: print $client "$id\n"; 3177: } 3178: else { 3179: print $client "error: ".($!+0) 3180: ."IO::File->new Failed ". 3181: "while attempting tmpput\n"; 3182: } 3183: } else { 3184: Reply($client, "refused\n", $userinput); 3185: 3186: } 3187: 3188: # ---------------------------------------------------------------------- tmpget 3189: } elsif ($userinput =~ /^tmpget/) { 3190: if(isClient) { 3191: my ($cmd,$id)=split(/:/,$userinput); 3192: chomp($id); 3193: $id=~s/\W/\_/g; 3194: my $store; 3195: my $execdir=$perlvar{'lonDaemons'}; 3196: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) { 3197: my $reply=<$store>; 3198: print $client "$reply\n"; 3199: close $store; 3200: } 3201: else { 3202: print $client "error: ".($!+0) 3203: ."IO::File->new Failed ". 3204: "while attempting tmpget\n"; 3205: } 3206: } else { 3207: Reply($client, "refused\n", $userinput); 3208: 3209: } 3210: # ---------------------------------------------------------------------- tmpdel 3211: } elsif ($userinput =~ /^tmpdel/) { 3212: if(isClient) { 3213: my ($cmd,$id)=split(/:/,$userinput); 3214: chomp($id); 3215: $id=~s/\W/\_/g; 3216: my $execdir=$perlvar{'lonDaemons'}; 3217: if (unlink("$execdir/tmp/$id.tmp")) { 3218: print $client "ok\n"; 3219: } else { 3220: print $client "error: ".($!+0) 3221: ."Unlink tmp Failed ". 3222: "while attempting tmpdel\n"; 3223: } 3224: } else { 3225: Reply($client, "refused\n", $userinput); 3226: 3227: } 3228: # ----------------------------------------- portfolio directory list (portls) 3229: } elsif ($userinput =~ /^portls/) { 3230: if(isClient) { 3231: my ($cmd,$uname,$udom)=split(/:/,$userinput); 3232: my $udir=propath($udom,$uname).'/userfiles/portfolio'; 3233: my $dirLine=''; 3234: my $dirContents=''; 3235: if (opendir(LSDIR,$udir.'/')){ 3236: while ($dirLine = readdir(LSDIR)){ 3237: $dirContents = $dirContents.$dirLine.' '; 3238: } 3239: } else { 3240: $dirContents = "No directory found\n"; 3241: } 3242: print $client $dirContents."\n"; 3243: } else { 3244: Reply($client, "refused\n", $userinput); 3245: } 3246: # -------------------------------------------------------------------------- ls 3247: } elsif ($userinput =~ /^ls/) { 3248: if(isClient) { 3249: my $obs; 3250: my $rights; 3251: my ($cmd,$ulsdir)=split(/:/,$userinput); 3252: my $ulsout=''; 3253: my $ulsfn; 3254: if (-e $ulsdir) { 3255: if(-d $ulsdir) { 3256: if (opendir(LSDIR,$ulsdir)) { 3257: while ($ulsfn=readdir(LSDIR)) { 3258: undef $obs, $rights; 3259: my @ulsstats=stat($ulsdir.'/'.$ulsfn); 3260: #We do some obsolete checking here 3261: if(-e $ulsdir.'/'.$ulsfn.".meta") { 3262: open(FILE, $ulsdir.'/'.$ulsfn.".meta"); 3263: my @obsolete=<FILE>; 3264: foreach my $obsolete (@obsolete) { 3265: if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; } 3266: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; } 3267: } 3268: } 3269: $ulsout.=$ulsfn.'&'.join('&',@ulsstats); 3270: if($obs eq '1') { $ulsout.="&1"; } 3271: else { $ulsout.="&0"; } 3272: if($rights eq '1') { $ulsout.="&1:"; } 3273: else { $ulsout.="&0:"; } 3274: } 3275: closedir(LSDIR); 3276: } 3277: } else { 3278: my @ulsstats=stat($ulsdir); 3279: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':'; 3280: } 3281: } else { 3282: $ulsout='no_such_dir'; 3283: } 3284: if ($ulsout eq '') { $ulsout='empty'; } 3285: print $client "$ulsout\n"; 3286: } else { 3287: Reply($client, "refused\n", $userinput); 3288: 3289: } 3290: # ----------------------------------------------------------------- setannounce 3291: } elsif ($userinput =~ /^setannounce/) { 3292: if (isClient) { 3293: my ($cmd,$announcement)=split(/:/,$userinput); 3294: chomp($announcement); 3295: $announcement=&unescape($announcement); 3296: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}. 3297: '/announcement.txt')) { 3298: print $store $announcement; 3299: close $store; 3300: print $client "ok\n"; 3301: } else { 3302: print $client "error: ".($!+0)."\n"; 3303: } 3304: } else { 3305: Reply($client, "refused\n", $userinput); 3306: 3307: } 3308: # ------------------------------------------------------------------ Hanging up 3309: } elsif (($userinput =~ /^exit/) || 3310: ($userinput =~ /^init/)) { # no restrictions. 3311: &logthis( 3312: "Client $clientip ($clientname) hanging up: $userinput"); 3313: print $client "bye\n"; 3314: $client->shutdown(2); # shutdown the socket forcibly. 3315: $client->close(); 3316: return 0; 3317: 3318: # ---------------------------------- set current host/domain 3319: } elsif ($userinput =~ /^sethost/) { 3320: if (isClient) { 3321: print $client &sethost($userinput)."\n"; 3322: } else { 3323: print $client "refused\n"; 3324: } 3325: #---------------------------------- request file (?) version. 3326: } elsif ($userinput =~/^version/) { 3327: if (isClient) { 3328: print $client &version($userinput)."\n"; 3329: } else { 3330: print $client "refused\n"; 3331: } 3332: #------------------------------- is auto-enrollment enabled? 3333: } elsif ($userinput =~/^autorun/) { 3334: if (isClient) { 3335: my ($cmd,$cdom) = split(/:/,$userinput); 3336: my $outcome = &localenroll::run($cdom); 3337: print $client "$outcome\n"; 3338: } else { 3339: print $client "0\n"; 3340: } 3341: #------------------------------- get official sections (for auto-enrollment). 3342: } elsif ($userinput =~/^autogetsections/) { 3343: if (isClient) { 3344: my ($cmd,$coursecode,$cdom)=split(/:/,$userinput); 3345: my @secs = &localenroll::get_sections($coursecode,$cdom); 3346: my $seclist = &escape(join(':',@secs)); 3347: print $client "$seclist\n"; 3348: } else { 3349: print $client "refused\n"; 3350: } 3351: #----------------------- validate owner of new course section (for auto-enrollment). 3352: } elsif ($userinput =~/^autonewcourse/) { 3353: if (isClient) { 3354: my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput); 3355: my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom); 3356: print $client "$outcome\n"; 3357: } else { 3358: print $client "refused\n"; 3359: } 3360: #-------------- validate course section in schedule of classes (for auto-enrollment). 3361: } elsif ($userinput =~/^autovalidatecourse/) { 3362: if (isClient) { 3363: my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput); 3364: my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom); 3365: print $client "$outcome\n"; 3366: } else { 3367: print $client "refused\n"; 3368: } 3369: #--------------------------- create password for new user (for auto-enrollment). 3370: } elsif ($userinput =~/^autocreatepassword/) { 3371: if (isClient) { 3372: my ($cmd,$authparam,$cdom)=split(/:/,$userinput); 3373: my ($create_passwd,$authchk); 3374: ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom); 3375: print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n"; 3376: } else { 3377: print $client "refused\n"; 3378: } 3379: #--------------------------- read and remove temporary files (for auto-enrollment). 3380: } elsif ($userinput =~/^autoretrieve/) { 3381: if (isClient) { 3382: my ($cmd,$filename) = split(/:/,$userinput); 3383: my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename; 3384: if ( (-e $source) && ($filename ne '') ) { 3385: my $reply = ''; 3386: if (open(my $fh,$source)) { 3387: while (<$fh>) { 3388: chomp($_); 3389: $_ =~ s/^\s+//g; 3390: $_ =~ s/\s+$//g; 3391: $reply .= $_; 3392: } 3393: close($fh); 3394: print $client &escape($reply)."\n"; 3395: # unlink($source); 3396: } else { 3397: print $client "error\n"; 3398: } 3399: } else { 3400: print $client "error\n"; 3401: } 3402: } else { 3403: print $client "refused\n"; 3404: } 3405: #--------------------- read and retrieve institutional code format (for support form). 3406: } elsif ($userinput =~/^autoinstcodeformat/) { 3407: if (isClient) { 3408: my $reply; 3409: my($cmd,$cdom,$course) = split(/:/,$userinput); 3410: my @pairs = split/\&/,$course; 3411: my %instcodes = (); 3412: my %codes = (); 3413: my @codetitles = (); 3414: my %cat_titles = (); 3415: my %cat_order = (); 3416: foreach (@pairs) { 3417: my ($key,$value) = split/=/,$_; 3418: $instcodes{&unescape($key)} = &unescape($value); 3419: } 3420: my $formatreply = &localenroll::instcode_format($cdom,\%instcodes,\%codes,\@codetitles,\%cat_titles,\%cat_order); 3421: if ($formatreply eq 'ok') { 3422: my $codes_str = &hash2str(%codes); 3423: my $codetitles_str = &array2str(@codetitles); 3424: my $cat_titles_str = &hash2str(%cat_titles); 3425: my $cat_order_str = &hash2str(%cat_order); 3426: print $client $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'.$cat_order_str."\n"; 3427: } 3428: } else { 3429: print $client "refused\n"; 3430: } 3431: # ------------------------------------------------------------- unknown command 3432: 3433: } else { 3434: # unknown command 3435: print $client "unknown_cmd\n"; 3436: } 3437: # -------------------------------------------------------------------- complete 3438: Debug("process_request - returning 1"); 3439: return 1; 3440: } 3441: # 3442: # Decipher encoded traffic 3443: # Parameters: 3444: # input - Encoded data. 3445: # Returns: 3446: # Decoded data or undef if encryption key was not yet negotiated. 3447: # Implicit input: 3448: # cipher - This global holds the negotiated encryption key. 3449: # 3450: sub decipher { 3451: my ($input) = @_; 3452: my $output = ''; 3453: 3454: 3455: if($cipher) { 3456: my($enc, $enclength, $encinput) = split(/:/, $input); 3457: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) { 3458: $output .= 3459: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16))); 3460: } 3461: return substr($output, 0, $enclength); 3462: } else { 3463: return undef; 3464: } 3465: } 3466: 3467: # 3468: # Register a command processor. This function is invoked to register a sub 3469: # to process a request. Once registered, the ProcessRequest sub can automatically 3470: # dispatch requests to an appropriate sub, and do the top level validity checking 3471: # as well: 3472: # - Is the keyword recognized. 3473: # - Is the proper client type attempting the request. 3474: # - Is the request encrypted if it has to be. 3475: # Parameters: 3476: # $request_name - Name of the request being registered. 3477: # This is the command request that will match 3478: # against the hash keywords to lookup the information 3479: # associated with the dispatch information. 3480: # $procedure - Reference to a sub to call to process the request. 3481: # All subs get called as follows: 3482: # Procedure($cmd, $tail, $replyfd, $key) 3483: # $cmd - the actual keyword that invoked us. 3484: # $tail - the tail of the request that invoked us. 3485: # $replyfd- File descriptor connected to the client 3486: # $must_encode - True if the request must be encoded to be good. 3487: # $client_ok - True if it's ok for a client to request this. 3488: # $manager_ok - True if it's ok for a manager to request this. 3489: # Side effects: 3490: # - On success, the Dispatcher hash has an entry added for the key $RequestName 3491: # - On failure, the program will die as it's a bad internal bug to try to 3492: # register a duplicate command handler. 3493: # 3494: sub register_handler { 3495: my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_; 3496: 3497: # Don't allow duplication# 3498: 3499: if (defined $Dispatcher{$request_name}) { 3500: die "Attempting to define a duplicate request handler for $request_name\n"; 3501: } 3502: # Build the client type mask: 3503: 3504: my $client_type_mask = 0; 3505: if($client_ok) { 3506: $client_type_mask |= $CLIENT_OK; 3507: } 3508: if($manager_ok) { 3509: $client_type_mask |= $MANAGER_OK; 3510: } 3511: 3512: # Enter the hash: 3513: 3514: my @entry = ($procedure, $must_encode, $client_type_mask); 3515: 3516: $Dispatcher{$request_name} = \@entry; 3517: 3518: } 3519: 3520: 3521: #------------------------------------------------------------------ 3522: 3523: 3524: 3525: 3526: # 3527: # Convert an error return code from lcpasswd to a string value. 3528: # 3529: sub lcpasswdstrerror { 3530: my $ErrorCode = shift; 3531: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) { 3532: return "lcpasswd Unrecognized error return value ".$ErrorCode; 3533: } else { 3534: return $passwderrors[$ErrorCode]; 3535: } 3536: } 3537: 3538: # 3539: # Convert an error return code from lcuseradd to a string value: 3540: # 3541: sub lcuseraddstrerror { 3542: my $ErrorCode = shift; 3543: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) { 3544: return "lcuseradd - Unrecognized error code: ".$ErrorCode; 3545: } else { 3546: return $adderrors[$ErrorCode]; 3547: } 3548: } 3549: 3550: # grabs exception and records it to log before exiting 3551: sub catchexception { 3552: my ($error)=@_; 3553: $SIG{'QUIT'}='DEFAULT'; 3554: $SIG{__DIE__}='DEFAULT'; 3555: &status("Catching exception"); 3556: &logthis("CRITICAL: " 3557: ."ABNORMAL EXIT. Child $$ for server $thisserver died through " 3558: ."a crash with this error msg->[$error]"); 3559: &logthis('Famous last words: '.$status.' - '.$lastlog); 3560: if ($client) { print $client "error: $error\n"; } 3561: $server->close(); 3562: die($error); 3563: } 3564: sub timeout { 3565: &status("Handling Timeout"); 3566: &logthis("CRITICAL: TIME OUT ".$$.""); 3567: &catchexception('Timeout'); 3568: } 3569: # -------------------------------- Set signal handlers to record abnormal exits 3570: 3571: 3572: $SIG{'QUIT'}=\&catchexception; 3573: $SIG{__DIE__}=\&catchexception; 3574: 3575: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf 3576: &status("Read loncapa.conf and loncapa_apache.conf"); 3577: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf'); 3578: %perlvar=%{$perlvarref}; 3579: undef $perlvarref; 3580: 3581: # ----------------------------- Make sure this process is running from user=www 3582: my $wwwid=getpwnam('www'); 3583: if ($wwwid!=$<) { 3584: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; 3585: my $subj="LON: $currenthostid User ID mismatch"; 3586: system("echo 'User ID mismatch. lond must be run as user www.' |\ 3587: mailto $emailto -s '$subj' > /dev/null"); 3588: exit 1; 3589: } 3590: 3591: # --------------------------------------------- Check if other instance running 3592: 3593: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid"; 3594: 3595: if (-e $pidfile) { 3596: my $lfh=IO::File->new("$pidfile"); 3597: my $pide=<$lfh>; 3598: chomp($pide); 3599: if (kill 0 => $pide) { die "already running"; } 3600: } 3601: 3602: # ------------------------------------------------------------- Read hosts file 3603: 3604: 3605: 3606: # establish SERVER socket, bind and listen. 3607: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'}, 3608: Type => SOCK_STREAM, 3609: Proto => 'tcp', 3610: Reuse => 1, 3611: Listen => 10 ) 3612: or die "making socket: $@\n"; 3613: 3614: # --------------------------------------------------------- Do global variables 3615: 3616: # global variables 3617: 3618: my %children = (); # keys are current child process IDs 3619: 3620: sub REAPER { # takes care of dead children 3621: $SIG{CHLD} = \&REAPER; 3622: &status("Handling child death"); 3623: my $pid; 3624: do { 3625: $pid = waitpid(-1,&WNOHANG()); 3626: if (defined($children{$pid})) { 3627: &logthis("Child $pid died"); 3628: delete($children{$pid}); 3629: } elsif ($pid > 0) { 3630: &logthis("Unknown Child $pid died"); 3631: } 3632: } while ( $pid > 0 ); 3633: foreach my $child (keys(%children)) { 3634: $pid = waitpid($child,&WNOHANG()); 3635: if ($pid > 0) { 3636: &logthis("Child $child - $pid looks like we missed it's death"); 3637: delete($children{$pid}); 3638: } 3639: } 3640: &status("Finished Handling child death"); 3641: } 3642: 3643: sub HUNTSMAN { # signal handler for SIGINT 3644: &status("Killing children (INT)"); 3645: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children 3646: kill 'INT' => keys %children; 3647: &logthis("Free socket: ".shutdown($server,2)); # free up socket 3648: my $execdir=$perlvar{'lonDaemons'}; 3649: unlink("$execdir/logs/lond.pid"); 3650: &logthis("CRITICAL: Shutting down"); 3651: &status("Done killing children"); 3652: exit; # clean up with dignity 3653: } 3654: 3655: sub HUPSMAN { # signal handler for SIGHUP 3656: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children 3657: &status("Killing children for restart (HUP)"); 3658: kill 'INT' => keys %children; 3659: &logthis("Free socket: ".shutdown($server,2)); # free up socket 3660: &logthis("CRITICAL: Restarting"); 3661: my $execdir=$perlvar{'lonDaemons'}; 3662: unlink("$execdir/logs/lond.pid"); 3663: &status("Restarting self (HUP)"); 3664: exec("$execdir/lond"); # here we go again 3665: } 3666: 3667: # 3668: # Kill off hashes that describe the host table prior to re-reading it. 3669: # Hashes affected are: 3670: # %hostid, %hostdom %hostip %hostdns. 3671: # 3672: sub KillHostHashes { 3673: foreach my $key (keys %hostid) { 3674: delete $hostid{$key}; 3675: } 3676: foreach my $key (keys %hostdom) { 3677: delete $hostdom{$key}; 3678: } 3679: foreach my $key (keys %hostip) { 3680: delete $hostip{$key}; 3681: } 3682: foreach my $key (keys %hostdns) { 3683: delete $hostdns{$key}; 3684: } 3685: } 3686: # 3687: # Read in the host table from file and distribute it into the various hashes: 3688: # 3689: # - %hostid - Indexed by IP, the loncapa hostname. 3690: # - %hostdom - Indexed by loncapa hostname, the domain. 3691: # - %hostip - Indexed by hostid, the Ip address of the host. 3692: sub ReadHostTable { 3693: 3694: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file"; 3695: my $myloncapaname = $perlvar{'lonHostID'}; 3696: Debug("My loncapa name is : $myloncapaname"); 3697: while (my $configline=<CONFIG>) { 3698: if (!($configline =~ /^\s*\#/)) { 3699: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline); 3700: chomp($ip); $ip=~s/\D+$//; 3701: $hostid{$ip}=$id; # LonCAPA name of host by IP. 3702: $hostdom{$id}=$domain; # LonCAPA domain name of host. 3703: $hostip{$id}=$ip; # IP address of host. 3704: $hostdns{$name} = $id; # LonCAPA name of host by DNS. 3705: 3706: if ($id eq $perlvar{'lonHostID'}) { 3707: Debug("Found me in the host table: $name"); 3708: $thisserver=$name; 3709: } 3710: } 3711: } 3712: close(CONFIG); 3713: } 3714: # 3715: # Reload the Apache daemon's state. 3716: # This is done by invoking /home/httpd/perl/apachereload 3717: # a setuid perl script that can be root for us to do this job. 3718: # 3719: sub ReloadApache { 3720: my $execdir = $perlvar{'lonDaemons'}; 3721: my $script = $execdir."/apachereload"; 3722: system($script); 3723: } 3724: 3725: # 3726: # Called in response to a USR2 signal. 3727: # - Reread hosts.tab 3728: # - All children connected to hosts that were removed from hosts.tab 3729: # are killed via SIGINT 3730: # - All children connected to previously existing hosts are sent SIGUSR1 3731: # - Our internal hosts hash is updated to reflect the new contents of 3732: # hosts.tab causing connections from hosts added to hosts.tab to 3733: # now be honored. 3734: # 3735: sub UpdateHosts { 3736: &status("Reload hosts.tab"); 3737: logthis(' Updating connections '); 3738: # 3739: # The %children hash has the set of IP's we currently have children 3740: # on. These need to be matched against records in the hosts.tab 3741: # Any ip's no longer in the table get killed off they correspond to 3742: # either dropped or changed hosts. Note that the re-read of the table 3743: # will take care of new and changed hosts as connections come into being. 3744: 3745: 3746: KillHostHashes; 3747: ReadHostTable; 3748: 3749: foreach my $child (keys %children) { 3750: my $childip = $children{$child}; 3751: if(!$hostid{$childip}) { 3752: logthis(' UpdateHosts killing child ' 3753: ." $child for ip $childip "); 3754: kill('INT', $child); 3755: } else { 3756: logthis(' keeping child for ip ' 3757: ." $childip (pid=$child) "); 3758: } 3759: } 3760: ReloadApache; 3761: &status("Finished reloading hosts.tab"); 3762: } 3763: 3764: 3765: sub checkchildren { 3766: &status("Checking on the children (sending signals)"); 3767: &initnewstatus(); 3768: &logstatus(); 3769: &logthis('Going to check on the children'); 3770: my $docdir=$perlvar{'lonDocRoot'}; 3771: foreach (sort keys %children) { 3772: #sleep 1; 3773: unless (kill 'USR1' => $_) { 3774: &logthis ('Child '.$_.' is dead'); 3775: &logstatus($$.' is dead'); 3776: delete($children{$_}); 3777: } 3778: } 3779: sleep 5; 3780: $SIG{ALRM} = sub { Debug("timeout"); 3781: die "timeout"; }; 3782: $SIG{__DIE__} = 'DEFAULT'; 3783: &status("Checking on the children (waiting for reports)"); 3784: foreach (sort keys %children) { 3785: unless (-e "$docdir/lon-status/londchld/$_.txt") { 3786: eval { 3787: alarm(300); 3788: &logthis('Child '.$_.' did not respond'); 3789: kill 9 => $_; 3790: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; 3791: #$subj="LON: $currenthostid killed lond process $_"; 3792: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`; 3793: #$execdir=$perlvar{'lonDaemons'}; 3794: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`; 3795: delete($children{$_}); 3796: alarm(0); 3797: } 3798: } 3799: } 3800: $SIG{ALRM} = 'DEFAULT'; 3801: $SIG{__DIE__} = \&catchexception; 3802: &status("Finished checking children"); 3803: &logthis('Finished Checking children'); 3804: } 3805: 3806: # --------------------------------------------------------------------- Logging 3807: 3808: sub logthis { 3809: my $message=shift; 3810: my $execdir=$perlvar{'lonDaemons'}; 3811: my $fh=IO::File->new(">>$execdir/logs/lond.log"); 3812: my $now=time; 3813: my $local=localtime($now); 3814: $lastlog=$local.': '.$message; 3815: print $fh "$local ($$): $message\n"; 3816: } 3817: 3818: # ------------------------- Conditional log if $DEBUG true. 3819: sub Debug { 3820: my $message = shift; 3821: if($DEBUG) { 3822: &logthis($message); 3823: } 3824: } 3825: 3826: # 3827: # Sub to do replies to client.. this gives a hook for some 3828: # debug tracing too: 3829: # Parameters: 3830: # fd - File open on client. 3831: # reply - Text to send to client. 3832: # request - Original request from client. 3833: # 3834: sub Reply { 3835: my ($fd, $reply, $request) = @_; 3836: print $fd $reply; 3837: Debug("Request was $request Reply was $reply"); 3838: 3839: $Transactions++; 3840: 3841: 3842: } 3843: 3844: 3845: # 3846: # Sub to report a failure. 3847: # This function: 3848: # - Increments the failure statistic counters. 3849: # - Invokes Reply to send the error message to the client. 3850: # Parameters: 3851: # fd - File descriptor open on the client 3852: # reply - Reply text to emit. 3853: # request - The original request message (used by Reply 3854: # to debug if that's enabled. 3855: # Implicit outputs: 3856: # $Failures- The number of failures is incremented. 3857: # Reply (invoked here) sends a message to the 3858: # client: 3859: # 3860: sub Failure { 3861: my $fd = shift; 3862: my $reply = shift; 3863: my $request = shift; 3864: 3865: $Failures++; 3866: Reply($fd, $reply, $request); # That's simple eh? 3867: } 3868: # ------------------------------------------------------------------ Log status 3869: 3870: sub logstatus { 3871: &status("Doing logging"); 3872: my $docdir=$perlvar{'lonDocRoot'}; 3873: { 3874: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt"); 3875: print $fh $status."\n".$lastlog."\n".time."\n$keymode"; 3876: $fh->close(); 3877: } 3878: &status("Finished $$.txt"); 3879: { 3880: open(LOG,">>$docdir/lon-status/londstatus.txt"); 3881: flock(LOG,LOCK_EX); 3882: print LOG $$."\t".$clientname."\t".$currenthostid."\t" 3883: .$status."\t".$lastlog."\t $keymode\n"; 3884: flock(DB,LOCK_UN); 3885: close(LOG); 3886: } 3887: &status("Finished logging"); 3888: } 3889: 3890: sub initnewstatus { 3891: my $docdir=$perlvar{'lonDocRoot'}; 3892: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt"); 3893: my $now=time; 3894: my $local=localtime($now); 3895: print $fh "LOND status $local - parent $$\n\n"; 3896: opendir(DIR,"$docdir/lon-status/londchld"); 3897: while (my $filename=readdir(DIR)) { 3898: unlink("$docdir/lon-status/londchld/$filename"); 3899: } 3900: closedir(DIR); 3901: } 3902: 3903: # -------------------------------------------------------------- Status setting 3904: 3905: sub status { 3906: my $what=shift; 3907: my $now=time; 3908: my $local=localtime($now); 3909: $status=$local.': '.$what; 3910: $0='lond: '.$what.' '.$local; 3911: } 3912: 3913: # -------------------------------------------------------- Escape Special Chars 3914: 3915: sub escape { 3916: my $str=shift; 3917: $str =~ s/(\W)/"%".unpack('H2',$1)/eg; 3918: return $str; 3919: } 3920: 3921: # ----------------------------------------------------- Un-Escape Special Chars 3922: 3923: sub unescape { 3924: my $str=shift; 3925: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; 3926: return $str; 3927: } 3928: 3929: # ----------------------------------------------------------- Send USR1 to lonc 3930: 3931: sub reconlonc { 3932: my $peerfile=shift; 3933: &logthis("Trying to reconnect for $peerfile"); 3934: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid"; 3935: if (my $fh=IO::File->new("$loncfile")) { 3936: my $loncpid=<$fh>; 3937: chomp($loncpid); 3938: if (kill 0 => $loncpid) { 3939: &logthis("lonc at pid $loncpid responding, sending USR1"); 3940: kill USR1 => $loncpid; 3941: } else { 3942: &logthis( 3943: "CRITICAL: " 3944: ."lonc at pid $loncpid not responding, giving up"); 3945: } 3946: } else { 3947: &logthis('CRITICAL: lonc not running, giving up'); 3948: } 3949: } 3950: 3951: # -------------------------------------------------- Non-critical communication 3952: 3953: sub subreply { 3954: my ($cmd,$server)=@_; 3955: my $peerfile="$perlvar{'lonSockDir'}/$server"; 3956: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", 3957: Type => SOCK_STREAM, 3958: Timeout => 10) 3959: or return "con_lost"; 3960: print $sclient "$cmd\n"; 3961: my $answer=<$sclient>; 3962: chomp($answer); 3963: if (!$answer) { $answer="con_lost"; } 3964: return $answer; 3965: } 3966: 3967: sub reply { 3968: my ($cmd,$server)=@_; 3969: my $answer; 3970: if ($server ne $currenthostid) { 3971: $answer=subreply($cmd,$server); 3972: if ($answer eq 'con_lost') { 3973: $answer=subreply("ping",$server); 3974: if ($answer ne $server) { 3975: &logthis("sub reply: answer != server answer is $answer, server is $server"); 3976: &reconlonc("$perlvar{'lonSockDir'}/$server"); 3977: } 3978: $answer=subreply($cmd,$server); 3979: } 3980: } else { 3981: $answer='self_reply'; 3982: } 3983: return $answer; 3984: } 3985: 3986: # -------------------------------------------------------------- Talk to lonsql 3987: 3988: sub sql_reply { 3989: my ($cmd)=@_; 3990: my $answer=&sub_sql_reply($cmd); 3991: if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); } 3992: return $answer; 3993: } 3994: 3995: sub sub_sql_reply { 3996: my ($cmd)=@_; 3997: my $unixsock="mysqlsock"; 3998: my $peerfile="$perlvar{'lonSockDir'}/$unixsock"; 3999: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", 4000: Type => SOCK_STREAM, 4001: Timeout => 10) 4002: or return "con_lost"; 4003: print $sclient "$cmd\n"; 4004: my $answer=<$sclient>; 4005: chomp($answer); 4006: if (!$answer) { $answer="con_lost"; } 4007: return $answer; 4008: } 4009: 4010: # -------------------------------------------- Return path to profile directory 4011: 4012: sub propath { 4013: my ($udom,$uname)=@_; 4014: $udom=~s/\W//g; 4015: $uname=~s/\W//g; 4016: my $subdir=$uname.'__'; 4017: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/; 4018: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname"; 4019: return $proname; 4020: } 4021: 4022: # --------------------------------------- Is this the home server of an author? 4023: 4024: sub ishome { 4025: my $author=shift; 4026: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/; 4027: my ($udom,$uname)=split(/\//,$author); 4028: my $proname=propath($udom,$uname); 4029: if (-e $proname) { 4030: return 'owner'; 4031: } else { 4032: return 'not_owner'; 4033: } 4034: } 4035: 4036: # ======================================================= Continue main program 4037: # ---------------------------------------------------- Fork once and dissociate 4038: 4039: my $fpid=fork; 4040: exit if $fpid; 4041: die "Couldn't fork: $!" unless defined ($fpid); 4042: 4043: POSIX::setsid() or die "Can't start new session: $!"; 4044: 4045: # ------------------------------------------------------- Write our PID on disk 4046: 4047: my $execdir=$perlvar{'lonDaemons'}; 4048: open (PIDSAVE,">$execdir/logs/lond.pid"); 4049: print PIDSAVE "$$\n"; 4050: close(PIDSAVE); 4051: &logthis("CRITICAL: ---------- Starting ----------"); 4052: &status('Starting'); 4053: 4054: 4055: 4056: # ----------------------------------------------------- Install signal handlers 4057: 4058: 4059: $SIG{CHLD} = \&REAPER; 4060: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN; 4061: $SIG{HUP} = \&HUPSMAN; 4062: $SIG{USR1} = \&checkchildren; 4063: $SIG{USR2} = \&UpdateHosts; 4064: 4065: # Read the host hashes: 4066: 4067: ReadHostTable; 4068: 4069: # -------------------------------------------------------------- 4070: # Accept connections. When a connection comes in, it is validated 4071: # and if good, a child process is created to process transactions 4072: # along the connection. 4073: 4074: while (1) { 4075: &status('Starting accept'); 4076: $client = $server->accept() or next; 4077: &status('Accepted '.$client.' off to spawn'); 4078: make_new_child($client); 4079: &status('Finished spawning'); 4080: } 4081: 4082: sub make_new_child { 4083: my $pid; 4084: # my $cipher; # Now global 4085: my $sigset; 4086: 4087: $client = shift; 4088: &status('Starting new child '.$client); 4089: &logthis(' Attempting to start child ('.$client. 4090: ")"); 4091: # block signal for fork 4092: $sigset = POSIX::SigSet->new(SIGINT); 4093: sigprocmask(SIG_BLOCK, $sigset) 4094: or die "Can't block SIGINT for fork: $!\n"; 4095: 4096: die "fork: $!" unless defined ($pid = fork); 4097: 4098: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of 4099: # connection liveness. 4100: 4101: # 4102: # Figure out who we're talking to so we can record the peer in 4103: # the pid hash. 4104: # 4105: my $caller = getpeername($client); 4106: my ($port,$iaddr); 4107: if (defined($caller) && length($caller) > 0) { 4108: ($port,$iaddr)=unpack_sockaddr_in($caller); 4109: } else { 4110: &logthis("Unable to determine who caller was, getpeername returned nothing"); 4111: } 4112: if (defined($iaddr)) { 4113: $clientip = inet_ntoa($iaddr); 4114: Debug("Connected with $clientip"); 4115: $clientdns = gethostbyaddr($iaddr, AF_INET); 4116: Debug("Connected with $clientdns by name"); 4117: } else { 4118: &logthis("Unable to determine clientip"); 4119: $clientip='Unavailable'; 4120: } 4121: 4122: if ($pid) { 4123: # Parent records the child's birth and returns. 4124: sigprocmask(SIG_UNBLOCK, $sigset) 4125: or die "Can't unblock SIGINT for fork: $!\n"; 4126: $children{$pid} = $clientip; 4127: &status('Started child '.$pid); 4128: return; 4129: } else { 4130: # Child can *not* return from this subroutine. 4131: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before 4132: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 4133: #don't get intercepted 4134: $SIG{USR1}= \&logstatus; 4135: $SIG{ALRM}= \&timeout; 4136: $lastlog='Forked '; 4137: $status='Forked'; 4138: 4139: # unblock signals 4140: sigprocmask(SIG_UNBLOCK, $sigset) 4141: or die "Can't unblock SIGINT for fork: $!\n"; 4142: 4143: # my $tmpsnum=0; # Now global 4144: #---------------------------------------------------- kerberos 5 initialization 4145: &Authen::Krb5::init_context(); 4146: &Authen::Krb5::init_ets(); 4147: 4148: &status('Accepted connection'); 4149: # ============================================================================= 4150: # do something with the connection 4151: # ----------------------------------------------------------------------------- 4152: # see if we know client and 'check' for spoof IP by ineffective challenge 4153: 4154: ReadManagerTable; # May also be a manager!! 4155: 4156: my $clientrec=($hostid{$clientip} ne undef); 4157: my $ismanager=($managers{$clientip} ne undef); 4158: $clientname = "[unknonwn]"; 4159: if($clientrec) { # Establish client type. 4160: $ConnectionType = "client"; 4161: $clientname = $hostid{$clientip}; 4162: if($ismanager) { 4163: $ConnectionType = "both"; 4164: } 4165: } else { 4166: $ConnectionType = "manager"; 4167: $clientname = $managers{$clientip}; 4168: } 4169: my $clientok; 4170: 4171: if ($clientrec || $ismanager) { 4172: &status("Waiting for init from $clientip $clientname"); 4173: &logthis('INFO: Connection, '. 4174: $clientip. 4175: " ($clientname) connection type = $ConnectionType " ); 4176: &status("Connecting $clientip ($clientname))"); 4177: my $remotereq=<$client>; 4178: chomp($remotereq); 4179: Debug("Got init: $remotereq"); 4180: my $inikeyword = split(/:/, $remotereq); 4181: if ($remotereq =~ /^init/) { 4182: &sethost("sethost:$perlvar{'lonHostID'}"); 4183: # 4184: # If the remote is attempting a local init... give that a try: 4185: # 4186: my ($i, $inittype) = split(/:/, $remotereq); 4187: 4188: # If the connection type is ssl, but I didn't get my 4189: # certificate files yet, then I'll drop back to 4190: # insecure (if allowed). 4191: 4192: if($inittype eq "ssl") { 4193: my ($ca, $cert) = lonssl::CertificateFile; 4194: my $kfile = lonssl::KeyFile; 4195: if((!$ca) || 4196: (!$cert) || 4197: (!$kfile)) { 4198: $inittype = ""; # This forces insecure attempt. 4199: &logthis(" Certificates not " 4200: ."installed -- trying insecure auth"); 4201: } else { # SSL certificates are in place so 4202: } # Leave the inittype alone. 4203: } 4204: 4205: if($inittype eq "local") { 4206: my $key = LocalConnection($client, $remotereq); 4207: if($key) { 4208: Debug("Got local key $key"); 4209: $clientok = 1; 4210: my $cipherkey = pack("H32", $key); 4211: $cipher = new IDEA($cipherkey); 4212: print $client "ok:local\n"; 4213: &logthis('"); 4215: $keymode = "local" 4216: } else { 4217: Debug("Failed to get local key"); 4218: $clientok = 0; 4219: shutdown($client, 3); 4220: close $client; 4221: } 4222: } elsif ($inittype eq "ssl") { 4223: my $key = SSLConnection($client); 4224: if ($key) { 4225: $clientok = 1; 4226: my $cipherkey = pack("H32", $key); 4227: $cipher = new IDEA($cipherkey); 4228: &logthis('' 4229: ."Successfull ssl authentication with $clientname "); 4230: $keymode = "ssl"; 4231: 4232: } else { 4233: $clientok = 0; 4234: close $client; 4235: } 4236: 4237: } else { 4238: my $ok = InsecureConnection($client); 4239: if($ok) { 4240: $clientok = 1; 4241: &logthis('' 4242: ."Successful insecure authentication with $clientname "); 4243: print $client "ok\n"; 4244: $keymode = "insecure"; 4245: } else { 4246: &logthis('' 4247: ."Attempted insecure connection disallowed "); 4248: close $client; 4249: $clientok = 0; 4250: 4251: } 4252: } 4253: } else { 4254: &logthis( 4255: "WARNING: " 4256: ."$clientip failed to initialize: >$remotereq< "); 4257: &status('No init '.$clientip); 4258: } 4259: 4260: } else { 4261: &logthis( 4262: "WARNING: Unknown client $clientip"); 4263: &status('Hung up on '.$clientip); 4264: } 4265: 4266: if ($clientok) { 4267: # ---------------- New known client connecting, could mean machine online again 4268: 4269: foreach my $id (keys(%hostip)) { 4270: if ($hostip{$id} ne $clientip || 4271: $hostip{$currenthostid} eq $clientip) { 4272: # no need to try to do recon's to myself 4273: next; 4274: } 4275: &reconlonc("$perlvar{'lonSockDir'}/$id"); 4276: } 4277: &logthis("Established connection: $clientname"); 4278: &status('Will listen to '.$clientname); 4279: # ------------------------------------------------------------ Process requests 4280: my $keep_going = 1; 4281: my $user_input; 4282: while(($user_input = get_request) && $keep_going) { 4283: alarm(120); 4284: Debug("Main: Got $user_input\n"); 4285: $keep_going = &process_request($user_input); 4286: alarm(0); 4287: &status('Listening to '.$clientname." ($keymode)"); 4288: } 4289: 4290: # --------------------------------------------- client unknown or fishy, refuse 4291: } else { 4292: print $client "refused\n"; 4293: $client->close(); 4294: &logthis("WARNING: " 4295: ."Rejected client $clientip, closing connection"); 4296: } 4297: } 4298: 4299: # ============================================================================= 4300: 4301: &logthis("CRITICAL: " 4302: ."Disconnect from $clientip ($clientname)"); 4303: 4304: 4305: # this exit is VERY important, otherwise the child will become 4306: # a producer of more and more children, forking yourself into 4307: # process death. 4308: exit; 4309: 4310: } 4311: 4312: 4313: # 4314: # Checks to see if the input roleput request was to set 4315: # an author role. If so, invokes the lchtmldir script to set 4316: # up a correct public_html 4317: # Parameters: 4318: # request - The request sent to the rolesput subchunk. 4319: # We're looking for /domain/_au 4320: # domain - The domain in which the user is having roles doctored. 4321: # user - Name of the user for which the role is being put. 4322: # authtype - The authentication type associated with the user. 4323: # 4324: sub manage_permissions 4325: { 4326: 4327: my ($request, $domain, $user, $authtype) = @_; 4328: 4329: # See if the request is of the form /$domain/_au 4330: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput... 4331: my $execdir = $perlvar{'lonDaemons'}; 4332: my $userhome= "/home/$user" ; 4333: &logthis("system $execdir/lchtmldir $userhome $user $authtype"); 4334: system("$execdir/lchtmldir $userhome $user $authtype"); 4335: } 4336: } 4337: 4338: 4339: # 4340: # Return the full path of a user password file, whether it exists or not. 4341: # Parameters: 4342: # domain - Domain in which the password file lives. 4343: # user - name of the user. 4344: # Returns: 4345: # Full passwd path: 4346: # 4347: sub password_path { 4348: my ($domain, $user) = @_; 4349: 4350: 4351: my $path = &propath($domain, $user); 4352: $path .= "/passwd"; 4353: 4354: return $path; 4355: } 4356: 4357: # Password Filename 4358: # Returns the path to a passwd file given domain and user... only if 4359: # it exists. 4360: # Parameters: 4361: # domain - Domain in which to search. 4362: # user - username. 4363: # Returns: 4364: # - If the password file exists returns its path. 4365: # - If the password file does not exist, returns undefined. 4366: # 4367: sub password_filename { 4368: my ($domain, $user) = @_; 4369: 4370: Debug ("PasswordFilename called: dom = $domain user = $user"); 4371: 4372: my $path = &password_path($domain, $user); 4373: Debug("PasswordFilename got path: $path"); 4374: if(-e $path) { 4375: return $path; 4376: } else { 4377: return undef; 4378: } 4379: } 4380: 4381: # 4382: # Rewrite the contents of the user's passwd file. 4383: # Parameters: 4384: # domain - domain of the user. 4385: # name - User's name. 4386: # contents - New contents of the file. 4387: # Returns: 4388: # 0 - Failed. 4389: # 1 - Success. 4390: # 4391: sub rewrite_password_file { 4392: my ($domain, $user, $contents) = @_; 4393: 4394: my $file = &password_filename($domain, $user); 4395: if (defined $file) { 4396: my $pf = IO::File->new(">$file"); 4397: if($pf) { 4398: print $pf "$contents\n"; 4399: return 1; 4400: } else { 4401: return 0; 4402: } 4403: } else { 4404: return 0; 4405: } 4406: 4407: } 4408: 4409: # 4410: # get_auth_type - Determines the authorization type of a user in a domain. 4411: 4412: # Returns the authorization type or nouser if there is no such user. 4413: # 4414: sub get_auth_type 4415: { 4416: 4417: my ($domain, $user) = @_; 4418: 4419: Debug("get_auth_type( $domain, $user ) \n"); 4420: my $proname = &propath($domain, $user); 4421: my $passwdfile = "$proname/passwd"; 4422: if( -e $passwdfile ) { 4423: my $pf = IO::File->new($passwdfile); 4424: my $realpassword = <$pf>; 4425: chomp($realpassword); 4426: Debug("Password info = $realpassword\n"); 4427: my ($authtype, $contentpwd) = split(/:/, $realpassword); 4428: Debug("Authtype = $authtype, content = $contentpwd\n"); 4429: my $availinfo = ''; 4430: if($authtype eq 'krb4' or $authtype eq 'krb5') { 4431: $availinfo = $contentpwd; 4432: } 4433: 4434: return "$authtype:$availinfo"; 4435: } else { 4436: Debug("Returning nouser"); 4437: return "nouser"; 4438: } 4439: } 4440: 4441: # 4442: # Validate a user given their domain, name and password. This utility 4443: # function is used by both AuthenticateHandler and ChangePasswordHandler 4444: # to validate the login credentials of a user. 4445: # Parameters: 4446: # $domain - The domain being logged into (this is required due to 4447: # the capability for multihomed systems. 4448: # $user - The name of the user being validated. 4449: # $password - The user's propoposed password. 4450: # 4451: # Returns: 4452: # 1 - The domain,user,pasword triplet corresponds to a valid 4453: # user. 4454: # 0 - The domain,user,password triplet is not a valid user. 4455: # 4456: sub validate_user { 4457: my ($domain, $user, $password) = @_; 4458: 4459: 4460: # Why negative ~pi you may well ask? Well this function is about 4461: # authentication, and therefore very important to get right. 4462: # I've initialized the flag that determines whether or not I've 4463: # validated correctly to a value it's not supposed to get. 4464: # At the end of this function. I'll ensure that it's not still that 4465: # value so we don't just wind up returning some accidental value 4466: # as a result of executing an unforseen code path that 4467: # did not set $validated. 4468: 4469: my $validated = -3.14159; 4470: 4471: # How we authenticate is determined by the type of authentication 4472: # the user has been assigned. If the authentication type is 4473: # "nouser", the user does not exist so we will return 0. 4474: 4475: my $contents = &get_auth_type($domain, $user); 4476: my ($howpwd, $contentpwd) = split(/:/, $contents); 4477: 4478: my $null = pack("C",0); # Used by kerberos auth types. 4479: 4480: if ($howpwd ne 'nouser') { 4481: 4482: if($howpwd eq "internal") { # Encrypted is in local password file. 4483: $validated = (crypt($password, $contentpwd) eq $contentpwd); 4484: } 4485: elsif ($howpwd eq "unix") { # User is a normal unix user. 4486: $contentpwd = (getpwnam($user))[1]; 4487: if($contentpwd) { 4488: if($contentpwd eq 'x') { # Shadow password file... 4489: my $pwauth_path = "/usr/local/sbin/pwauth"; 4490: open PWAUTH, "|$pwauth_path" or 4491: die "Cannot invoke authentication"; 4492: print PWAUTH "$user\n$password\n"; 4493: close PWAUTH; 4494: $validated = ! $?; 4495: 4496: } else { # Passwords in /etc/passwd. 4497: $validated = (crypt($password, 4498: $contentpwd) eq $contentpwd); 4499: } 4500: } else { 4501: $validated = 0; 4502: } 4503: } 4504: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain. 4505: if(! ($password =~ /$null/) ) { 4506: my $k4error = &Authen::Krb4::get_pw_in_tkt($user, 4507: "", 4508: $contentpwd,, 4509: 'krbtgt', 4510: $contentpwd, 4511: 1, 4512: $password); 4513: if(!$k4error) { 4514: $validated = 1; 4515: } else { 4516: $validated = 0; 4517: &logthis('krb4: '.$user.', '.$contentpwd.', '. 4518: &Authen::Krb4::get_err_txt($Authen::Krb4::error)); 4519: } 4520: } else { 4521: $validated = 0; # Password has a match with null. 4522: } 4523: } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain. 4524: if(!($password =~ /$null/)) { # Null password not allowed. 4525: my $krbclient = &Authen::Krb5::parse_name($user.'@' 4526: .$contentpwd); 4527: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd; 4528: my $krbserver = &Authen::Krb5::parse_name($krbservice); 4529: my $credentials= &Authen::Krb5::cc_default(); 4530: $credentials->initialize($krbclient); 4531: my $krbreturn = &Authen::KRb5::get_in_tkt_with_password($krbclient, 4532: $krbserver, 4533: $password, 4534: $credentials); 4535: $validated = ($krbreturn == 1); 4536: } else { 4537: $validated = 0; 4538: } 4539: } elsif ($howpwd eq "localauth") { 4540: # Authenticate via installation specific authentcation method: 4541: $validated = &localauth::localauth($user, 4542: $password, 4543: $contentpwd); 4544: } else { # Unrecognized auth is also bad. 4545: $validated = 0; 4546: } 4547: } else { 4548: $validated = 0; 4549: } 4550: # 4551: # $validated has the correct stat of the authentication: 4552: # 4553: 4554: unless ($validated != -3.14159) { 4555: die "ValidateUser - failed to set the value of validated"; 4556: } 4557: return $validated; 4558: } 4559: 4560: 4561: sub addline { 4562: my ($fname,$hostid,$ip,$newline)=@_; 4563: my $contents; 4564: my $found=0; 4565: my $expr='^'.$hostid.':'.$ip.':'; 4566: $expr =~ s/\./\\\./g; 4567: my $sh; 4568: if ($sh=IO::File->new("$fname.subscription")) { 4569: while (my $subline=<$sh>) { 4570: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;} 4571: } 4572: $sh->close(); 4573: } 4574: $sh=IO::File->new(">$fname.subscription"); 4575: if ($contents) { print $sh $contents; } 4576: if ($newline) { print $sh $newline; } 4577: $sh->close(); 4578: return $found; 4579: } 4580: 4581: sub get_chat { 4582: my ($cdom,$cname,$udom,$uname)=@_; 4583: my %hash; 4584: my $proname=&propath($cdom,$cname); 4585: my @entries=(); 4586: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db", 4587: &GDBM_READER(),0640)) { 4588: @entries=map { $_.':'.$hash{$_} } sort keys %hash; 4589: untie %hash; 4590: } 4591: my @participants=(); 4592: my $cutoff=time-60; 4593: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db", 4594: &GDBM_WRCREAT(),0640)) { 4595: $hash{$uname.':'.$udom}=time; 4596: foreach (sort keys %hash) { 4597: if ($hash{$_}>$cutoff) { 4598: $participants[$#participants+1]='active_participant:'.$_; 4599: } 4600: } 4601: untie %hash; 4602: } 4603: return (@participants,@entries); 4604: } 4605: 4606: sub chat_add { 4607: my ($cdom,$cname,$newchat)=@_; 4608: my %hash; 4609: my $proname=&propath($cdom,$cname); 4610: my @entries=(); 4611: my $time=time; 4612: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db", 4613: &GDBM_WRCREAT(),0640)) { 4614: @entries=map { $_.':'.$hash{$_} } sort keys %hash; 4615: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/); 4616: my ($thentime,$idnum)=split(/\_/,$lastid); 4617: my $newid=$time.'_000000'; 4618: if ($thentime==$time) { 4619: $idnum=~s/^0+//; 4620: $idnum++; 4621: $idnum=substr('000000'.$idnum,-6,6); 4622: $newid=$time.'_'.$idnum; 4623: } 4624: $hash{$newid}=$newchat; 4625: my $expired=$time-3600; 4626: foreach (keys %hash) { 4627: my ($thistime)=($_=~/(\d+)\_/); 4628: if ($thistime<$expired) { 4629: delete $hash{$_}; 4630: } 4631: } 4632: untie %hash; 4633: } 4634: { 4635: my $hfh; 4636: if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 4637: print $hfh "$time:".&unescape($newchat)."\n"; 4638: } 4639: } 4640: } 4641: 4642: sub unsub { 4643: my ($fname,$clientip)=@_; 4644: my $result; 4645: my $unsubs = 0; # Number of successful unsubscribes: 4646: 4647: 4648: # An old way subscriptions were handled was to have a 4649: # subscription marker file: 4650: 4651: Debug("Attempting unlink of $fname.$clientname"); 4652: if (unlink("$fname.$clientname")) { 4653: $unsubs++; # Successful unsub via marker file. 4654: } 4655: 4656: # The more modern way to do it is to have a subscription list 4657: # file: 4658: 4659: if (-e "$fname.subscription") { 4660: my $found=&addline($fname,$clientname,$clientip,''); 4661: if ($found) { 4662: $unsubs++; 4663: } 4664: } 4665: 4666: # If either or both of these mechanisms succeeded in unsubscribing a 4667: # resource we can return ok: 4668: 4669: if($unsubs) { 4670: $result = "ok\n"; 4671: } else { 4672: $result = "not_subscribed\n"; 4673: } 4674: 4675: return $result; 4676: } 4677: 4678: sub currentversion { 4679: my $fname=shift; 4680: my $version=-1; 4681: my $ulsdir=''; 4682: if ($fname=~/^(.+)\/[^\/]+$/) { 4683: $ulsdir=$1; 4684: } 4685: my ($fnamere1,$fnamere2); 4686: # remove version if already specified 4687: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/; 4688: # get the bits that go before and after the version number 4689: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) { 4690: $fnamere1=$1; 4691: $fnamere2='.'.$2; 4692: } 4693: if (-e $fname) { $version=1; } 4694: if (-e $ulsdir) { 4695: if(-d $ulsdir) { 4696: if (opendir(LSDIR,$ulsdir)) { 4697: my $ulsfn; 4698: while ($ulsfn=readdir(LSDIR)) { 4699: # see if this is a regular file (ignore links produced earlier) 4700: my $thisfile=$ulsdir.'/'.$ulsfn; 4701: unless (-l $thisfile) { 4702: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) { 4703: if ($1>$version) { $version=$1; } 4704: } 4705: } 4706: } 4707: closedir(LSDIR); 4708: $version++; 4709: } 4710: } 4711: } 4712: return $version; 4713: } 4714: 4715: sub thisversion { 4716: my $fname=shift; 4717: my $version=-1; 4718: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) { 4719: $version=$1; 4720: } 4721: return $version; 4722: } 4723: 4724: sub subscribe { 4725: my ($userinput,$clientip)=@_; 4726: my $result; 4727: my ($cmd,$fname)=split(/:/,$userinput); 4728: my $ownership=&ishome($fname); 4729: if ($ownership eq 'owner') { 4730: # explitly asking for the current version? 4731: unless (-e $fname) { 4732: my $currentversion=&currentversion($fname); 4733: if (&thisversion($fname)==$currentversion) { 4734: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) { 4735: my $root=$1; 4736: my $extension=$2; 4737: symlink($root.'.'.$extension, 4738: $root.'.'.$currentversion.'.'.$extension); 4739: unless ($extension=~/\.meta$/) { 4740: symlink($root.'.'.$extension.'.meta', 4741: $root.'.'.$currentversion.'.'.$extension.'.meta'); 4742: } 4743: } 4744: } 4745: } 4746: if (-e $fname) { 4747: if (-d $fname) { 4748: $result="directory\n"; 4749: } else { 4750: if (-e "$fname.$clientname") {&unsub($fname,$clientip);} 4751: my $now=time; 4752: my $found=&addline($fname,$clientname,$clientip, 4753: "$clientname:$clientip:$now\n"); 4754: if ($found) { $result="$fname\n"; } 4755: # if they were subscribed to only meta data, delete that 4756: # subscription, when you subscribe to a file you also get 4757: # the metadata 4758: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); } 4759: $fname=~s/\/home\/httpd\/html\/res/raw/; 4760: $fname="http://$thisserver/".$fname; 4761: $result="$fname\n"; 4762: } 4763: } else { 4764: $result="not_found\n"; 4765: } 4766: } else { 4767: $result="rejected\n"; 4768: } 4769: return $result; 4770: } 4771: 4772: sub make_passwd_file { 4773: my ($uname, $umode,$npass,$passfilename)=@_; 4774: my $result="ok\n"; 4775: if ($umode eq 'krb4' or $umode eq 'krb5') { 4776: { 4777: my $pf = IO::File->new(">$passfilename"); 4778: print $pf "$umode:$npass\n"; 4779: } 4780: } elsif ($umode eq 'internal') { 4781: my $salt=time; 4782: $salt=substr($salt,6,2); 4783: my $ncpass=crypt($npass,$salt); 4784: { 4785: &Debug("Creating internal auth"); 4786: my $pf = IO::File->new(">$passfilename"); 4787: print $pf "internal:$ncpass\n"; 4788: } 4789: } elsif ($umode eq 'localauth') { 4790: { 4791: my $pf = IO::File->new(">$passfilename"); 4792: print $pf "localauth:$npass\n"; 4793: } 4794: } elsif ($umode eq 'unix') { 4795: { 4796: # 4797: # Don't allow the creation of privileged accounts!!! that would 4798: # be real bad!!! 4799: # 4800: my $uid = getpwnam($uname); 4801: if((defined $uid) && ($uid == 0)) { 4802: &logthis(">>>Attempted to create privilged account blocked"); 4803: return "no_priv_account_error\n"; 4804: } 4805: 4806: my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd"; 4807: 4808: my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status"; 4809: { 4810: &Debug("Executing external: ".$execpath); 4811: &Debug("user = ".$uname.", Password =". $npass); 4812: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log"); 4813: print $se "$uname\n"; 4814: print $se "$npass\n"; 4815: print $se "$npass\n"; 4816: print $se "$lc_error_file\n"; # Status -> unique file. 4817: } 4818: my $error = IO::File->new("< $lc_error_file"); 4819: my $useraddok = <$error>; 4820: $error->close; 4821: unlink($lc_error_file); 4822: 4823: chomp $useraddok; 4824: 4825: if($useraddok > 0) { 4826: my $error_text = &lcuseraddstrerror($useraddok); 4827: &logthis("Failed lcuseradd: $error_text"); 4828: $result = "lcuseradd_failed:$error_text\n"; 4829: } else { 4830: my $pf = IO::File->new(">$passfilename"); 4831: print $pf "unix:\n"; 4832: } 4833: } 4834: } elsif ($umode eq 'none') { 4835: { 4836: my $pf = IO::File->new("> $passfilename"); 4837: print $pf "none:\n"; 4838: } 4839: } else { 4840: $result="auth_mode_error\n"; 4841: } 4842: return $result; 4843: } 4844: 4845: sub sethost { 4846: my ($remotereq) = @_; 4847: my (undef,$hostid)=split(/:/,$remotereq); 4848: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; } 4849: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) { 4850: $currenthostid =$hostid; 4851: $currentdomainid=$hostdom{$hostid}; 4852: &logthis("Setting hostid to $hostid, and domain to $currentdomainid"); 4853: } else { 4854: &logthis("Requested host id $hostid not an alias of ". 4855: $perlvar{'lonHostID'}." refusing connection"); 4856: return 'unable_to_set'; 4857: } 4858: return 'ok'; 4859: } 4860: 4861: sub version { 4862: my ($userinput)=@_; 4863: $remoteVERSION=(split(/:/,$userinput))[1]; 4864: return "version:$VERSION"; 4865: } 4866: 4867: #There is a copy of this in lonnet.pm 4868: sub userload { 4869: my $numusers=0; 4870: { 4871: opendir(LONIDS,$perlvar{'lonIDsDir'}); 4872: my $filename; 4873: my $curtime=time; 4874: while ($filename=readdir(LONIDS)) { 4875: if ($filename eq '.' || $filename eq '..') {next;} 4876: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9]; 4877: if ($curtime-$mtime < 1800) { $numusers++; } 4878: } 4879: closedir(LONIDS); 4880: } 4881: my $userloadpercent=0; 4882: my $maxuserload=$perlvar{'lonUserLoadLim'}; 4883: if ($maxuserload) { 4884: $userloadpercent=100*$numusers/$maxuserload; 4885: } 4886: $userloadpercent=sprintf("%.2f",$userloadpercent); 4887: return $userloadpercent; 4888: } 4889: 4890: # Routines for serializing arrays and hashes (copies from lonnet) 4891: 4892: sub array2str { 4893: my (@array) = @_; 4894: my $result=&arrayref2str(\@array); 4895: $result=~s/^__ARRAY_REF__//; 4896: $result=~s/__END_ARRAY_REF__$//; 4897: return $result; 4898: } 4899: 4900: sub arrayref2str { 4901: my ($arrayref) = @_; 4902: my $result='__ARRAY_REF__'; 4903: foreach my $elem (@$arrayref) { 4904: if(ref($elem) eq 'ARRAY') { 4905: $result.=&arrayref2str($elem).'&'; 4906: } elsif(ref($elem) eq 'HASH') { 4907: $result.=&hashref2str($elem).'&'; 4908: } elsif(ref($elem)) { 4909: #print("Got a ref of ".(ref($elem))." skipping."); 4910: } else { 4911: $result.=&escape($elem).'&'; 4912: } 4913: } 4914: $result=~s/\&$//; 4915: $result .= '__END_ARRAY_REF__'; 4916: return $result; 4917: } 4918: 4919: sub hash2str { 4920: my (%hash) = @_; 4921: my $result=&hashref2str(\%hash); 4922: $result=~s/^__HASH_REF__//; 4923: $result=~s/__END_HASH_REF__$//; 4924: return $result; 4925: } 4926: 4927: sub hashref2str { 4928: my ($hashref)=@_; 4929: my $result='__HASH_REF__'; 4930: foreach (sort(keys(%$hashref))) { 4931: if (ref($_) eq 'ARRAY') { 4932: $result.=&arrayref2str($_).'='; 4933: } elsif (ref($_) eq 'HASH') { 4934: $result.=&hashref2str($_).'='; 4935: } elsif (ref($_)) { 4936: $result.='='; 4937: #print("Got a ref of ".(ref($_))." skipping."); 4938: } else { 4939: if ($_) {$result.=&escape($_).'=';} else { last; } 4940: } 4941: 4942: if(ref($hashref->{$_}) eq 'ARRAY') { 4943: $result.=&arrayref2str($hashref->{$_}).'&'; 4944: } elsif(ref($hashref->{$_}) eq 'HASH') { 4945: $result.=&hashref2str($hashref->{$_}).'&'; 4946: } elsif(ref($hashref->{$_})) { 4947: $result.='&'; 4948: #print("Got a ref of ".(ref($hashref->{$_}))." skipping."); 4949: } else { 4950: $result.=&escape($hashref->{$_}).'&'; 4951: } 4952: } 4953: $result=~s/\&$//; 4954: $result .= '__END_HASH_REF__'; 4955: return $result; 4956: } 4957: 4958: # ----------------------------------- POD (plain old documentation, CPAN style) 4959: 4960: =head1 NAME 4961: 4962: lond - "LON Daemon" Server (port "LOND" 5663) 4963: 4964: =head1 SYNOPSIS 4965: 4966: Usage: B<lond> 4967: 4968: Should only be run as user=www. This is a command-line script which 4969: is invoked by B<loncron>. There is no expectation that a typical user 4970: will manually start B<lond> from the command-line. (In other words, 4971: DO NOT START B<lond> YOURSELF.) 4972: 4973: =head1 DESCRIPTION 4974: 4975: There are two characteristics associated with the running of B<lond>, 4976: PROCESS MANAGEMENT (starting, stopping, handling child processes) 4977: and SERVER-SIDE ACTIVITIES (password authentication, user creation, 4978: subscriptions, etc). These are described in two large 4979: sections below. 4980: 4981: B<PROCESS MANAGEMENT> 4982: 4983: Preforker - server who forks first. Runs as a daemon. HUPs. 4984: Uses IDEA encryption 4985: 4986: B<lond> forks off children processes that correspond to the other servers 4987: in the network. Management of these processes can be done at the 4988: parent process level or the child process level. 4989: 4990: B<logs/lond.log> is the location of log messages. 4991: 4992: The process management is now explained in terms of linux shell commands, 4993: subroutines internal to this code, and signal assignments: 4994: 4995: =over 4 4996: 4997: =item * 4998: 4999: PID is stored in B<logs/lond.pid> 5000: 5001: This is the process id number of the parent B<lond> process. 5002: 5003: =item * 5004: 5005: SIGTERM and SIGINT 5006: 5007: Parent signal assignment: 5008: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN; 5009: 5010: Child signal assignment: 5011: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also) 5012: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber 5013: to restart a new child.) 5014: 5015: Command-line invocations: 5016: B<kill> B<-s> SIGTERM I<PID> 5017: B<kill> B<-s> SIGINT I<PID> 5018: 5019: Subroutine B<HUNTSMAN>: 5020: This is only invoked for the B<lond> parent I<PID>. 5021: This kills all the children, and then the parent. 5022: The B<lonc.pid> file is cleared. 5023: 5024: =item * 5025: 5026: SIGHUP 5027: 5028: Current bug: 5029: This signal can only be processed the first time 5030: on the parent process. Subsequent SIGHUP signals 5031: have no effect. 5032: 5033: Parent signal assignment: 5034: $SIG{HUP} = \&HUPSMAN; 5035: 5036: Child signal assignment: 5037: none (nothing happens) 5038: 5039: Command-line invocations: 5040: B<kill> B<-s> SIGHUP I<PID> 5041: 5042: Subroutine B<HUPSMAN>: 5043: This is only invoked for the B<lond> parent I<PID>, 5044: This kills all the children, and then the parent. 5045: The B<lond.pid> file is cleared. 5046: 5047: =item * 5048: 5049: SIGUSR1 5050: 5051: Parent signal assignment: 5052: $SIG{USR1} = \&USRMAN; 5053: 5054: Child signal assignment: 5055: $SIG{USR1}= \&logstatus; 5056: 5057: Command-line invocations: 5058: B<kill> B<-s> SIGUSR1 I<PID> 5059: 5060: Subroutine B<USRMAN>: 5061: When invoked for the B<lond> parent I<PID>, 5062: SIGUSR1 is sent to all the children, and the status of 5063: each connection is logged. 5064: 5065: =item * 5066: 5067: SIGUSR2 5068: 5069: Parent Signal assignment: 5070: $SIG{USR2} = \&UpdateHosts 5071: 5072: Child signal assignment: 5073: NONE 5074: 5075: 5076: =item * 5077: 5078: SIGCHLD 5079: 5080: Parent signal assignment: 5081: $SIG{CHLD} = \&REAPER; 5082: 5083: Child signal assignment: 5084: none 5085: 5086: Command-line invocations: 5087: B<kill> B<-s> SIGCHLD I<PID> 5088: 5089: Subroutine B<REAPER>: 5090: This is only invoked for the B<lond> parent I<PID>. 5091: Information pertaining to the child is removed. 5092: The socket port is cleaned up. 5093: 5094: =back 5095: 5096: B<SERVER-SIDE ACTIVITIES> 5097: 5098: Server-side information can be accepted in an encrypted or non-encrypted 5099: method. 5100: 5101: =over 4 5102: 5103: =item ping 5104: 5105: Query a client in the hosts.tab table; "Are you there?" 5106: 5107: =item pong 5108: 5109: Respond to a ping query. 5110: 5111: =item ekey 5112: 5113: Read in encrypted key, make cipher. Respond with a buildkey. 5114: 5115: =item load 5116: 5117: Respond with CPU load based on a computation upon /proc/loadavg. 5118: 5119: =item currentauth 5120: 5121: Reply with current authentication information (only over an 5122: encrypted channel). 5123: 5124: =item auth 5125: 5126: Only over an encrypted channel, reply as to whether a user's 5127: authentication information can be validated. 5128: 5129: =item passwd 5130: 5131: Allow for a password to be set. 5132: 5133: =item makeuser 5134: 5135: Make a user. 5136: 5137: =item passwd 5138: 5139: Allow for authentication mechanism and password to be changed. 5140: 5141: =item home 5142: 5143: Respond to a question "are you the home for a given user?" 5144: 5145: =item update 5146: 5147: Update contents of a subscribed resource. 5148: 5149: =item unsubscribe 5150: 5151: The server is unsubscribing from a resource. 5152: 5153: =item subscribe 5154: 5155: The server is subscribing to a resource. 5156: 5157: =item log 5158: 5159: Place in B<logs/lond.log> 5160: 5161: =item put 5162: 5163: stores hash in namespace 5164: 5165: =item rolesputy 5166: 5167: put a role into a user's environment 5168: 5169: =item get 5170: 5171: returns hash with keys from array 5172: reference filled in from namespace 5173: 5174: =item eget 5175: 5176: returns hash with keys from array 5177: reference filled in from namesp (encrypts the return communication) 5178: 5179: =item rolesget 5180: 5181: get a role from a user's environment 5182: 5183: =item del 5184: 5185: deletes keys out of array from namespace 5186: 5187: =item keys 5188: 5189: returns namespace keys 5190: 5191: =item dump 5192: 5193: dumps the complete (or key matching regexp) namespace into a hash 5194: 5195: =item store 5196: 5197: stores hash permanently 5198: for this url; hashref needs to be given and should be a \%hashname; the 5199: remaining args aren't required and if they aren't passed or are '' they will 5200: be derived from the ENV 5201: 5202: =item restore 5203: 5204: returns a hash for a given url 5205: 5206: =item querysend 5207: 5208: Tells client about the lonsql process that has been launched in response 5209: to a sent query. 5210: 5211: =item queryreply 5212: 5213: Accept information from lonsql and make appropriate storage in temporary 5214: file space. 5215: 5216: =item idput 5217: 5218: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers 5219: for each student, defined perhaps by the institutional Registrar.) 5220: 5221: =item idget 5222: 5223: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers 5224: for each student, defined perhaps by the institutional Registrar.) 5225: 5226: =item tmpput 5227: 5228: Accept and store information in temporary space. 5229: 5230: =item tmpget 5231: 5232: Send along temporarily stored information. 5233: 5234: =item ls 5235: 5236: List part of a user's directory. 5237: 5238: =item pushtable 5239: 5240: Pushes a file in /home/httpd/lonTab directory. Currently limited to: 5241: hosts.tab and domain.tab. The old file is copied to *.tab.backup but 5242: must be restored manually in case of a problem with the new table file. 5243: pushtable requires that the request be encrypted and validated via 5244: ValidateManager. The form of the command is: 5245: enc:pushtable tablename <tablecontents> \n 5246: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 5247: cleartext newline. 5248: 5249: =item Hanging up (exit or init) 5250: 5251: What to do when a client tells the server that they (the client) 5252: are leaving the network. 5253: 5254: =item unknown command 5255: 5256: If B<lond> is sent an unknown command (not in the list above), 5257: it replys to the client "unknown_cmd". 5258: 5259: 5260: =item UNKNOWN CLIENT 5261: 5262: If the anti-spoofing algorithm cannot verify the client, 5263: the client is rejected (with a "refused" message sent 5264: to the client, and the connection is closed. 5265: 5266: =back 5267: 5268: =head1 PREREQUISITES 5269: 5270: IO::Socket 5271: IO::File 5272: Apache::File 5273: Symbol 5274: POSIX 5275: Crypt::IDEA 5276: LWP::UserAgent() 5277: GDBM_File 5278: Authen::Krb4 5279: Authen::Krb5 5280: 5281: =head1 COREQUISITES 5282: 5283: =head1 OSNAMES 5284: 5285: linux 5286: 5287: =head1 SCRIPT CATEGORIES 5288: 5289: Server/Process 5290: 5291: =cut