1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.227 2004/08/10 11:38:11 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: 1.227 $'; #' 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 $thisserver) {
191: &logthis('<font color="red"> LocalConnection rejecting non local: '
192: ."$clientdns ne $thisserver </font>");
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('<font color = "red"> LocalConnection: caller is insane! '
205: ."init = $init, and type = $type </font>");
206: close($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("<font color=\"red\"> CRITICAL"
241: ."Can't get key file $err </font>");
242: return undef;
243: }
244: my ($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("<font color=\"red\"> CRITICAL"
254: ."Can't get certificates: $err </font>");
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("<font color=\"red\"> CRITICAL "
275: ."SSL Socket promotion failed: $err </font>");
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("<font color='blue'>WARNING client did not respond to challenge</font>");
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('<font color="red">No manager table. Nobody can manage!!</font>');
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('<font color="green"> registering manager '.
405: "$dnsname as $cluname with $hostip </font>\n");
406: }
407: } else {
408: logthis('<font color="green"> existing host'." $host</font>\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('<font color="red"> Unable to create '.$TempFile."</font>");
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('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
633: return "error:$!";
634: }
635: &logthis('<font color="green"> Pushfile: backed up '
636: .$tablefile." to $backupfile</font>");
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('<font color="red"> Pushfile: unable to install '
652: .$tablefile." $! </font>");
653: return "error:$!";
654: } else {
655: &logthis('<font color="green"> Installed new '.$tablefile
656: ."</font>");
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('<font color="red"> Reinitializing lonc pid='.$loncpid
700: ."</font>");
701: kill("USR2", $loncpid);
702: } elsif ($process eq 'lond') {
703: logthis('<font color="red"> Reinitializing self (lond) </font>');
704: &UpdateHosts; # Lond is us!!
705: } else {
706: &logthis('<font color="yellow" Invalid reinit request for '.$process
707: ."</font>");
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('<font color="green"> isValideditCommand checking: '.
733: "Command = '$command', Key = '$key', Newline = '$newline' </font>\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: ®ister_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: ®ister_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: ®ister_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: ®ister_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: ®ister_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: ®ister_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: ®ister_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: ®ister_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: ®ister_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: ®ister_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)=split(/\//,$fname);
1760: my $udir=&propath($udom,$uname).'/userfiles';
1761: unless (-e $udir) {
1762: mkdir($udir,0770);
1763: }
1764: if (-e $udir) {
1765: $ufile=~s/^[\.\~]+//;
1766: $ufile=~s/\///g;
1767: my $destname=$udir.'/'.$ufile;
1768: my $transname=$udir.'/'.$ufile.'.in.transit';
1769: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
1770: my $response;
1771: alarm(120);
1772: {
1773: my $ua=new LWP::UserAgent;
1774: my $request=new HTTP::Request('GET',"$remoteurl");
1775: $response=$ua->request($request,$transname);
1776: }
1777: alarm(0);
1778: if ($response->is_error()) {
1779: unlink($transname);
1780: my $message=$response->status_line;
1781: &logthis("LWP GET: $message for $fname ($remoteurl)");
1782: &Failure($client, "failed\n", $userinput);
1783: } else {
1784: if (!rename($transname,$destname)) {
1785: &logthis("Unable to move $transname to $destname");
1786: unlink($transname);
1787: &Failure($client, "failed\n", $userinput);
1788: } else {
1789: &Reply($client, "ok\n", $userinput);
1790: }
1791: }
1792: } else {
1793: &Failure($client, "not_home\n", $userinput);
1794: }
1795: return 1;
1796: }
1797: ®ister_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
1798:
1799: #
1800: # Remove a file from a user's home directory userfiles subdirectory.
1801: # Parameters:
1802: # cmd - the Lond request keyword that got us here.
1803: # tail - the part of the command past the keyword.
1804: # client- File descriptor connected with the client.
1805: #
1806: # Returns:
1807: # 1 - Continue processing.
1808:
1809: sub remove_user_file_handler {
1810: my ($cmd, $tail, $client) = @_;
1811:
1812: my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
1813:
1814: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
1815: &logthis("$udom - $uname - $ufile");
1816: if ($ufile =~m|/\.\./|) {
1817: # any files paths with /../ in them refuse
1818: # to deal with
1819: &Failure($client, "refused\n", "$cmd:$tail");
1820: } else {
1821: my $udir = &propath($udom,$uname);
1822: if (-e $udir) {
1823: my $file=$udir.'/userfiles/'.$ufile;
1824: if (-e $file) {
1825: unlink($file);
1826: if (-e $file) {
1827: &Failure($client, "failed\n", "$cmd:$tail");
1828: } else {
1829: &Reply($client, "ok\n", "$cmd:$tail");
1830: }
1831: } else {
1832: &Failure($client, "not_found\n", "$cmd:$tail");
1833: }
1834: } else {
1835: &Failure($client, "not_home\n", "$cmd:$tail");
1836: }
1837: }
1838: return 1;
1839: }
1840: ®ister_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
1841:
1842:
1843: #
1844: # Authenticate access to a user file by checking the user's
1845: # session token(?)
1846: #
1847: # Parameters:
1848: # cmd - The request keyword that dispatched to tus.
1849: # tail - The tail of the request (colon separated parameters).
1850: # client - Filehandle open on the client.
1851: # Return:
1852: # 1.
1853:
1854: sub token_auth_user_file_handler {
1855: my ($cmd, $tail, $client) = @_;
1856:
1857: my ($fname, $session) = split(/:/, $tail);
1858:
1859: chomp($session);
1860: my $reply='non_auth';
1861: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
1862: $session.'.id')) {
1863: while (my $line=<ENVIN>) {
1864: if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
1865: }
1866: close(ENVIN);
1867: &Reply($client, $reply);
1868: } else {
1869: &Failure($client, "invalid_token\n", "$cmd:$tail");
1870: }
1871: return 1;
1872:
1873: }
1874:
1875: ®ister_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
1876: #---------------------------------------------------------------
1877: #
1878: # Getting, decoding and dispatching requests:
1879: #
1880:
1881: #
1882: # Get a Request:
1883: # Gets a Request message from the client. The transaction
1884: # is defined as a 'line' of text. We remove the new line
1885: # from the text line.
1886: #
1887: sub get_request {
1888: my $input = <$client>;
1889: chomp($input);
1890:
1891: Debug("get_request: Request = $input\n");
1892:
1893: &status('Processing '.$clientname.':'.$input);
1894:
1895: return $input;
1896: }
1897: #---------------------------------------------------------------
1898: #
1899: # Process a request. This sub should shrink as each action
1900: # gets farmed out into a separat sub that is registered
1901: # with the dispatch hash.
1902: #
1903: # Parameters:
1904: # user_input - The request received from the client (lonc).
1905: # Returns:
1906: # true to keep processing, false if caller should exit.
1907: #
1908: sub process_request {
1909: my ($userinput) = @_; # Easier for now to break style than to
1910: # fix all the userinput -> user_input.
1911: my $wasenc = 0; # True if request was encrypted.
1912: # ------------------------------------------------------------ See if encrypted
1913: if ($userinput =~ /^enc/) {
1914: $userinput = decipher($userinput);
1915: $wasenc=1;
1916: if(!$userinput) { # Cipher not defined.
1917: &Failure($client, "error: Encrypted data without negotated key");
1918: return 0;
1919: }
1920: }
1921: Debug("process_request: $userinput\n");
1922:
1923: #
1924: # The 'correct way' to add a command to lond is now to
1925: # write a sub to execute it and Add it to the command dispatch
1926: # hash via a call to register_handler.. The comments to that
1927: # sub should give you enough to go on to show how to do this
1928: # along with the examples that are building up as this code
1929: # is getting refactored. Until all branches of the
1930: # if/elseif monster below have been factored out into
1931: # separate procesor subs, if the dispatch hash is missing
1932: # the command keyword, we will fall through to the remainder
1933: # of the if/else chain below in order to keep this thing in
1934: # working order throughout the transmogrification.
1935:
1936: my ($command, $tail) = split(/:/, $userinput, 2);
1937: chomp($command);
1938: chomp($tail);
1939: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
1940: $command =~ s/(\r)//; # And this too for parameterless commands.
1941: if(!$tail) {
1942: $tail =""; # defined but blank.
1943: }
1944:
1945: &Debug("Command received: $command, encoded = $wasenc");
1946:
1947: if(defined $Dispatcher{$command}) {
1948:
1949: my $dispatch_info = $Dispatcher{$command};
1950: my $handler = $$dispatch_info[0];
1951: my $need_encode = $$dispatch_info[1];
1952: my $client_types = $$dispatch_info[2];
1953: Debug("Matched dispatch hash: mustencode: $need_encode "
1954: ."ClientType $client_types");
1955:
1956: # Validate the request:
1957:
1958: my $ok = 1;
1959: my $requesterprivs = 0;
1960: if(&isClient()) {
1961: $requesterprivs |= $CLIENT_OK;
1962: }
1963: if(&isManager()) {
1964: $requesterprivs |= $MANAGER_OK;
1965: }
1966: if($need_encode && (!$wasenc)) {
1967: Debug("Must encode but wasn't: $need_encode $wasenc");
1968: $ok = 0;
1969: }
1970: if(($client_types & $requesterprivs) == 0) {
1971: Debug("Client not privileged to do this operation");
1972: $ok = 0;
1973: }
1974:
1975: if($ok) {
1976: Debug("Dispatching to handler $command $tail");
1977: my $keep_going = &$handler($command, $tail, $client);
1978: return $keep_going;
1979: } else {
1980: Debug("Refusing to dispatch because client did not match requirements");
1981: Failure($client, "refused\n", $userinput);
1982: return 1;
1983: }
1984:
1985: }
1986:
1987: #------------------- Commands not yet in spearate handlers. --------------
1988:
1989:
1990:
1991: # ----------------------------------------------------------------- unsubscribe
1992: if ($userinput =~ /^unsub/) {
1993: if(isClient) {
1994: my ($cmd,$fname)=split(/:/,$userinput);
1995: if (-e $fname) {
1996: print $client &unsub($fname,$clientip);
1997: } else {
1998: print $client "not_found\n";
1999: }
2000: } else {
2001: Reply($client, "refused\n", $userinput);
2002:
2003: }
2004: # ------------------------------------------------------------------- subscribe
2005: } elsif ($userinput =~ /^sub/) {
2006: if(isClient) {
2007: print $client &subscribe($userinput,$clientip);
2008: } else {
2009: Reply($client, "refused\n", $userinput);
2010:
2011: }
2012: # ------------------------------------------------------------- current version
2013: } elsif ($userinput =~ /^currentversion/) {
2014: if(isClient) {
2015: my ($cmd,$fname)=split(/:/,$userinput);
2016: print $client ¤tversion($fname)."\n";
2017: } else {
2018: Reply($client, "refused\n", $userinput);
2019:
2020: }
2021: # ------------------------------------------------------------------------- log
2022: } elsif ($userinput =~ /^log/) {
2023: if(isClient) {
2024: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
2025: chomp($what);
2026: my $proname=propath($udom,$uname);
2027: my $now=time;
2028: {
2029: my $hfh;
2030: if ($hfh=IO::File->new(">>$proname/activity.log")) {
2031: print $hfh "$now:$clientname:$what\n";
2032: print $client "ok\n";
2033: } else {
2034: print $client "error: ".($!+0)
2035: ." IO::File->new Failed "
2036: ."while attempting log\n";
2037: }
2038: }
2039: } else {
2040: Reply($client, "refused\n", $userinput);
2041:
2042: }
2043: # ------------------------------------------------------------------------- put
2044: } elsif ($userinput =~ /^put/) {
2045: if(isClient) {
2046: my ($cmd,$udom,$uname,$namespace,$what)
2047: =split(/:/,$userinput,5);
2048: $namespace=~s/\//\_/g;
2049: $namespace=~s/\W//g;
2050: if ($namespace ne 'roles') {
2051: chomp($what);
2052: my $proname=propath($udom,$uname);
2053: my $now=time;
2054: my @pairs=split(/\&/,$what);
2055: my %hash;
2056: if (tie(%hash,'GDBM_File',
2057: "$proname/$namespace.db",
2058: &GDBM_WRCREAT(),0640)) {
2059: unless ($namespace=~/^nohist\_/) {
2060: my $hfh;
2061: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }
2062: }
2063:
2064: foreach my $pair (@pairs) {
2065: my ($key,$value)=split(/=/,$pair);
2066: $hash{$key}=$value;
2067: }
2068: if (untie(%hash)) {
2069: print $client "ok\n";
2070: } else {
2071: print $client "error: ".($!+0)
2072: ." untie(GDBM) failed ".
2073: "while attempting put\n";
2074: }
2075: } else {
2076: print $client "error: ".($!)
2077: ." tie(GDBM) Failed ".
2078: "while attempting put\n";
2079: }
2080: } else {
2081: print $client "refused\n";
2082: }
2083: } else {
2084: Reply($client, "refused\n", $userinput);
2085:
2086: }
2087: # ------------------------------------------------------------------- inc
2088: } elsif ($userinput =~ /^inc:/) {
2089: if(isClient) {
2090: my ($cmd,$udom,$uname,$namespace,$what)
2091: =split(/:/,$userinput);
2092: $namespace=~s/\//\_/g;
2093: $namespace=~s/\W//g;
2094: if ($namespace ne 'roles') {
2095: chomp($what);
2096: my $proname=propath($udom,$uname);
2097: my $now=time;
2098: my @pairs=split(/\&/,$what);
2099: my %hash;
2100: if (tie(%hash,'GDBM_File',
2101: "$proname/$namespace.db",
2102: &GDBM_WRCREAT(),0640)) {
2103: unless ($namespace=~/^nohist\_/) {
2104: my $hfh;
2105: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }
2106: }
2107: foreach my $pair (@pairs) {
2108: my ($key,$value)=split(/=/,$pair);
2109: # We could check that we have a number...
2110: if (! defined($value) || $value eq '') {
2111: $value = 1;
2112: }
2113: $hash{$key}+=$value;
2114: }
2115: if (untie(%hash)) {
2116: print $client "ok\n";
2117: } else {
2118: print $client "error: ".($!+0)
2119: ." untie(GDBM) failed ".
2120: "while attempting inc\n";
2121: }
2122: } else {
2123: print $client "error: ".($!)
2124: ." tie(GDBM) Failed ".
2125: "while attempting inc\n";
2126: }
2127: } else {
2128: print $client "refused\n";
2129: }
2130: } else {
2131: Reply($client, "refused\n", $userinput);
2132:
2133: }
2134: # -------------------------------------------------------------------- rolesput
2135: } elsif ($userinput =~ /^rolesput/) {
2136: if(isClient) {
2137: &Debug("rolesput");
2138: if ($wasenc==1) {
2139: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
2140: =split(/:/,$userinput);
2141: &Debug("cmd = ".$cmd." exedom= ".$exedom.
2142: "user = ".$exeuser." udom=".$udom.
2143: "what = ".$what);
2144: my $namespace='roles';
2145: chomp($what);
2146: my $proname=propath($udom,$uname);
2147: my $now=time;
2148: my @pairs=split(/\&/,$what);
2149: my %hash;
2150: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2151: {
2152: my $hfh;
2153: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
2154: print $hfh "P:$now:$exedom:$exeuser:$what\n";
2155: }
2156: }
2157:
2158: foreach my $pair (@pairs) {
2159: my ($key,$value)=split(/=/,$pair);
2160: &ManagePermissions($key, $udom, $uname,
2161: &get_auth_type( $udom,
2162: $uname));
2163: $hash{$key}=$value;
2164: }
2165: if (untie(%hash)) {
2166: print $client "ok\n";
2167: } else {
2168: print $client "error: ".($!+0)
2169: ." untie(GDBM) Failed ".
2170: "while attempting rolesput\n";
2171: }
2172: } else {
2173: print $client "error: ".($!+0)
2174: ." tie(GDBM) Failed ".
2175: "while attempting rolesput\n";
2176: }
2177: } else {
2178: print $client "refused\n";
2179: }
2180: } else {
2181: Reply($client, "refused\n", $userinput);
2182:
2183: }
2184: # -------------------------------------------------------------------- rolesdel
2185: } elsif ($userinput =~ /^rolesdel/) {
2186: if(isClient) {
2187: &Debug("rolesdel");
2188: if ($wasenc==1) {
2189: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
2190: =split(/:/,$userinput);
2191: &Debug("cmd = ".$cmd." exedom= ".$exedom.
2192: "user = ".$exeuser." udom=".$udom.
2193: "what = ".$what);
2194: my $namespace='roles';
2195: chomp($what);
2196: my $proname=propath($udom,$uname);
2197: my $now=time;
2198: my @rolekeys=split(/\&/,$what);
2199: my %hash;
2200: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2201: {
2202: my $hfh;
2203: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
2204: print $hfh "D:$now:$exedom:$exeuser:$what\n";
2205: }
2206: }
2207: foreach my $key (@rolekeys) {
2208: delete $hash{$key};
2209: }
2210: if (untie(%hash)) {
2211: print $client "ok\n";
2212: } else {
2213: print $client "error: ".($!+0)
2214: ." untie(GDBM) Failed ".
2215: "while attempting rolesdel\n";
2216: }
2217: } else {
2218: print $client "error: ".($!+0)
2219: ." tie(GDBM) Failed ".
2220: "while attempting rolesdel\n";
2221: }
2222: } else {
2223: print $client "refused\n";
2224: }
2225: } else {
2226: Reply($client, "refused\n", $userinput);
2227:
2228: }
2229: # ------------------------------------------------------------------------- get
2230: } elsif ($userinput =~ /^get/) {
2231: if(isClient) {
2232: my ($cmd,$udom,$uname,$namespace,$what)
2233: =split(/:/,$userinput);
2234: $namespace=~s/\//\_/g;
2235: $namespace=~s/\W//g;
2236: chomp($what);
2237: my @queries=split(/\&/,$what);
2238: my $proname=propath($udom,$uname);
2239: my $qresult='';
2240: my %hash;
2241: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2242: for (my $i=0;$i<=$#queries;$i++) {
2243: $qresult.="$hash{$queries[$i]}&";
2244: }
2245: if (untie(%hash)) {
2246: $qresult=~s/\&$//;
2247: print $client "$qresult\n";
2248: } else {
2249: print $client "error: ".($!+0)
2250: ." untie(GDBM) Failed ".
2251: "while attempting get\n";
2252: }
2253: } else {
2254: if ($!+0 == 2) {
2255: print $client "error:No such file or ".
2256: "GDBM reported bad block error\n";
2257: } else {
2258: print $client "error: ".($!+0)
2259: ." tie(GDBM) Failed ".
2260: "while attempting get\n";
2261: }
2262: }
2263: } else {
2264: Reply($client, "refused\n", $userinput);
2265:
2266: }
2267: # ------------------------------------------------------------------------ eget
2268: } elsif ($userinput =~ /^eget/) {
2269: if (isClient) {
2270: my ($cmd,$udom,$uname,$namespace,$what)
2271: =split(/:/,$userinput);
2272: $namespace=~s/\//\_/g;
2273: $namespace=~s/\W//g;
2274: chomp($what);
2275: my @queries=split(/\&/,$what);
2276: my $proname=propath($udom,$uname);
2277: my $qresult='';
2278: my %hash;
2279: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2280: for (my $i=0;$i<=$#queries;$i++) {
2281: $qresult.="$hash{$queries[$i]}&";
2282: }
2283: if (untie(%hash)) {
2284: $qresult=~s/\&$//;
2285: if ($cipher) {
2286: my $cmdlength=length($qresult);
2287: $qresult.=" ";
2288: my $encqresult='';
2289: for
2290: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
2291: $encqresult.=
2292: unpack("H16",
2293: $cipher->encrypt(substr($qresult,$encidx,8)));
2294: }
2295: print $client "enc:$cmdlength:$encqresult\n";
2296: } else {
2297: print $client "error:no_key\n";
2298: }
2299: } else {
2300: print $client "error: ".($!+0)
2301: ." untie(GDBM) Failed ".
2302: "while attempting eget\n";
2303: }
2304: } else {
2305: print $client "error: ".($!+0)
2306: ." tie(GDBM) Failed ".
2307: "while attempting eget\n";
2308: }
2309: } else {
2310: Reply($client, "refused\n", $userinput);
2311:
2312: }
2313: # ------------------------------------------------------------------------- del
2314: } elsif ($userinput =~ /^del/) {
2315: if(isClient) {
2316: my ($cmd,$udom,$uname,$namespace,$what)
2317: =split(/:/,$userinput);
2318: $namespace=~s/\//\_/g;
2319: $namespace=~s/\W//g;
2320: chomp($what);
2321: my $proname=propath($udom,$uname);
2322: my $now=time;
2323: my @keys=split(/\&/,$what);
2324: my %hash;
2325: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2326: unless ($namespace=~/^nohist\_/) {
2327: my $hfh;
2328: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "D:$now:$what\n"; }
2329: }
2330: foreach my $key (@keys) {
2331: delete($hash{$key});
2332: }
2333: if (untie(%hash)) {
2334: print $client "ok\n";
2335: } else {
2336: print $client "error: ".($!+0)
2337: ." untie(GDBM) Failed ".
2338: "while attempting del\n";
2339: }
2340: } else {
2341: print $client "error: ".($!+0)
2342: ." tie(GDBM) Failed ".
2343: "while attempting del\n";
2344: }
2345: } else {
2346: Reply($client, "refused\n", $userinput);
2347:
2348: }
2349: # ------------------------------------------------------------------------ keys
2350: } elsif ($userinput =~ /^keys/) {
2351: if(isClient) {
2352: my ($cmd,$udom,$uname,$namespace)
2353: =split(/:/,$userinput);
2354: $namespace=~s/\//\_/g;
2355: $namespace=~s/\W//g;
2356: my $proname=propath($udom,$uname);
2357: my $qresult='';
2358: my %hash;
2359: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2360: foreach my $key (keys %hash) {
2361: $qresult.="$key&";
2362: }
2363: if (untie(%hash)) {
2364: $qresult=~s/\&$//;
2365: print $client "$qresult\n";
2366: } else {
2367: print $client "error: ".($!+0)
2368: ." untie(GDBM) Failed ".
2369: "while attempting keys\n";
2370: }
2371: } else {
2372: print $client "error: ".($!+0)
2373: ." tie(GDBM) Failed ".
2374: "while attempting keys\n";
2375: }
2376: } else {
2377: Reply($client, "refused\n", $userinput);
2378:
2379: }
2380: # ----------------------------------------------------------------- dumpcurrent
2381: } elsif ($userinput =~ /^currentdump/) {
2382: if (isClient) {
2383: my ($cmd,$udom,$uname,$namespace)
2384: =split(/:/,$userinput);
2385: $namespace=~s/\//\_/g;
2386: $namespace=~s/\W//g;
2387: my $qresult='';
2388: my $proname=propath($udom,$uname);
2389: my %hash;
2390: if (tie(%hash,'GDBM_File',
2391: "$proname/$namespace.db",
2392: &GDBM_READER(),0640)) {
2393: # Structure of %data:
2394: # $data{$symb}->{$parameter}=$value;
2395: # $data{$symb}->{'v.'.$parameter}=$version;
2396: # since $parameter will be unescaped, we do not
2397: # have to worry about silly parameter names...
2398: my %data = ();
2399: while (my ($key,$value) = each(%hash)) {
2400: my ($v,$symb,$param) = split(/:/,$key);
2401: next if ($v eq 'version' || $symb eq 'keys');
2402: next if (exists($data{$symb}) &&
2403: exists($data{$symb}->{$param}) &&
2404: $data{$symb}->{'v.'.$param} > $v);
2405: $data{$symb}->{$param}=$value;
2406: $data{$symb}->{'v.'.$param}=$v;
2407: }
2408: if (untie(%hash)) {
2409: while (my ($symb,$param_hash) = each(%data)) {
2410: while(my ($param,$value) = each (%$param_hash)){
2411: next if ($param =~ /^v\./);
2412: $qresult.=$symb.':'.$param.'='.$value.'&';
2413: }
2414: }
2415: chop($qresult);
2416: print $client "$qresult\n";
2417: } else {
2418: print $client "error: ".($!+0)
2419: ." untie(GDBM) Failed ".
2420: "while attempting currentdump\n";
2421: }
2422: } else {
2423: print $client "error: ".($!+0)
2424: ." tie(GDBM) Failed ".
2425: "while attempting currentdump\n";
2426: }
2427: } else {
2428: Reply($client, "refused\n", $userinput);
2429: }
2430: # ------------------------------------------------------------------------ dump
2431: } elsif ($userinput =~ /^dump/) {
2432: if(isClient) {
2433: my ($cmd,$udom,$uname,$namespace,$regexp)
2434: =split(/:/,$userinput);
2435: $namespace=~s/\//\_/g;
2436: $namespace=~s/\W//g;
2437: if (defined($regexp)) {
2438: $regexp=&unescape($regexp);
2439: } else {
2440: $regexp='.';
2441: }
2442: my $qresult='';
2443: my $proname=propath($udom,$uname);
2444: my %hash;
2445: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2446: while (my ($key,$value) = each(%hash)) {
2447: if ($regexp eq '.') {
2448: $qresult.=$key.'='.$value.'&';
2449: } else {
2450: my $unescapeKey = &unescape($key);
2451: if (eval('$unescapeKey=~/$regexp/')) {
2452: $qresult.="$key=$value&";
2453: }
2454: }
2455: }
2456: if (untie(%hash)) {
2457: chop($qresult);
2458: print $client "$qresult\n";
2459: } else {
2460: print $client "error: ".($!+0)
2461: ." untie(GDBM) Failed ".
2462: "while attempting dump\n";
2463: }
2464: } else {
2465: print $client "error: ".($!+0)
2466: ." tie(GDBM) Failed ".
2467: "while attempting dump\n";
2468: }
2469: } else {
2470: Reply($client, "refused\n", $userinput);
2471:
2472: }
2473: # ----------------------------------------------------------------------- store
2474: } elsif ($userinput =~ /^store/) {
2475: if(isClient) {
2476: my ($cmd,$udom,$uname,$namespace,$rid,$what)
2477: =split(/:/,$userinput);
2478: $namespace=~s/\//\_/g;
2479: $namespace=~s/\W//g;
2480: if ($namespace ne 'roles') {
2481: chomp($what);
2482: my $proname=propath($udom,$uname);
2483: my $now=time;
2484: my @pairs=split(/\&/,$what);
2485: my %hash;
2486: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2487: unless ($namespace=~/^nohist\_/) {
2488: my $hfh;
2489: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
2490: print $hfh "P:$now:$rid:$what\n";
2491: }
2492: }
2493: my @previouskeys=split(/&/,$hash{"keys:$rid"});
2494: my $key;
2495: $hash{"version:$rid"}++;
2496: my $version=$hash{"version:$rid"};
2497: my $allkeys='';
2498: foreach my $pair (@pairs) {
2499: my ($key,$value)=split(/=/,$pair);
2500: $allkeys.=$key.':';
2501: $hash{"$version:$rid:$key"}=$value;
2502: }
2503: $hash{"$version:$rid:timestamp"}=$now;
2504: $allkeys.='timestamp';
2505: $hash{"$version:keys:$rid"}=$allkeys;
2506: if (untie(%hash)) {
2507: print $client "ok\n";
2508: } else {
2509: print $client "error: ".($!+0)
2510: ." untie(GDBM) Failed ".
2511: "while attempting store\n";
2512: }
2513: } else {
2514: print $client "error: ".($!+0)
2515: ." tie(GDBM) Failed ".
2516: "while attempting store\n";
2517: }
2518: } else {
2519: print $client "refused\n";
2520: }
2521: } else {
2522: Reply($client, "refused\n", $userinput);
2523:
2524: }
2525: # --------------------------------------------------------------------- restore
2526: } elsif ($userinput =~ /^restore/) {
2527: if(isClient) {
2528: my ($cmd,$udom,$uname,$namespace,$rid)
2529: =split(/:/,$userinput);
2530: $namespace=~s/\//\_/g;
2531: $namespace=~s/\W//g;
2532: chomp($rid);
2533: my $proname=propath($udom,$uname);
2534: my $qresult='';
2535: my %hash;
2536: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2537: my $version=$hash{"version:$rid"};
2538: $qresult.="version=$version&";
2539: my $scope;
2540: for ($scope=1;$scope<=$version;$scope++) {
2541: my $vkeys=$hash{"$scope:keys:$rid"};
2542: my @keys=split(/:/,$vkeys);
2543: my $key;
2544: $qresult.="$scope:keys=$vkeys&";
2545: foreach $key (@keys) {
2546: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
2547: }
2548: }
2549: if (untie(%hash)) {
2550: $qresult=~s/\&$//;
2551: print $client "$qresult\n";
2552: } else {
2553: print $client "error: ".($!+0)
2554: ." untie(GDBM) Failed ".
2555: "while attempting restore\n";
2556: }
2557: } else {
2558: print $client "error: ".($!+0)
2559: ." tie(GDBM) Failed ".
2560: "while attempting restore\n";
2561: }
2562: } else {
2563: Reply($client, "refused\n", $userinput);
2564:
2565: }
2566: # -------------------------------------------------------------------- chatsend
2567: } elsif ($userinput =~ /^chatsend/) {
2568: if(isClient) {
2569: my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
2570: &chatadd($cdom,$cnum,$newpost);
2571: print $client "ok\n";
2572: } else {
2573: Reply($client, "refused\n", $userinput);
2574:
2575: }
2576: # -------------------------------------------------------------------- chatretr
2577: } elsif ($userinput =~ /^chatretr/) {
2578: if(isClient) {
2579: my
2580: ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
2581: my $reply='';
2582: foreach (&getchat($cdom,$cnum,$udom,$uname)) {
2583: $reply.=&escape($_).':';
2584: }
2585: $reply=~s/\:$//;
2586: print $client $reply."\n";
2587: } else {
2588: Reply($client, "refused\n", $userinput);
2589:
2590: }
2591: # ------------------------------------------------------------------- querysend
2592: } elsif ($userinput =~ /^querysend/) {
2593: if (isClient) {
2594: my ($cmd,$query,
2595: $arg1,$arg2,$arg3)=split(/\:/,$userinput);
2596: $query=~s/\n*$//g;
2597: print $client "".
2598: sqlreply("$clientname\&$query".
2599: "\&$arg1"."\&$arg2"."\&$arg3")."\n";
2600: } else {
2601: Reply($client, "refused\n", $userinput);
2602:
2603: }
2604: # ------------------------------------------------------------------ queryreply
2605: } elsif ($userinput =~ /^queryreply/) {
2606: if(isClient) {
2607: my ($cmd,$id,$reply)=split(/:/,$userinput);
2608: my $store;
2609: my $execdir=$perlvar{'lonDaemons'};
2610: if ($store=IO::File->new(">$execdir/tmp/$id")) {
2611: $reply=~s/\&/\n/g;
2612: print $store $reply;
2613: close $store;
2614: my $store2=IO::File->new(">$execdir/tmp/$id.end");
2615: print $store2 "done\n";
2616: close $store2;
2617: print $client "ok\n";
2618: } else {
2619: print $client "error: ".($!+0)
2620: ." IO::File->new Failed ".
2621: "while attempting queryreply\n";
2622: }
2623: } else {
2624: Reply($client, "refused\n", $userinput);
2625:
2626: }
2627: # ----------------------------------------------------------------- courseidput
2628: } elsif ($userinput =~ /^courseidput/) {
2629: if(isClient) {
2630: my ($cmd,$udom,$what)=split(/:/,$userinput);
2631: chomp($what);
2632: $udom=~s/\W//g;
2633: my $proname=
2634: "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
2635: my $now=time;
2636: my @pairs=split(/\&/,$what);
2637: my %hash;
2638: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
2639: foreach my $pair (@pairs) {
2640: my ($key,$descr,$inst_code)=split(/=/,$pair);
2641: $hash{$key}=$descr.':'.$inst_code.':'.$now;
2642: }
2643: if (untie(%hash)) {
2644: print $client "ok\n";
2645: } else {
2646: print $client "error: ".($!+0)
2647: ." untie(GDBM) Failed ".
2648: "while attempting courseidput\n";
2649: }
2650: } else {
2651: print $client "error: ".($!+0)
2652: ." tie(GDBM) Failed ".
2653: "while attempting courseidput\n";
2654: }
2655: } else {
2656: Reply($client, "refused\n", $userinput);
2657:
2658: }
2659: # ---------------------------------------------------------------- courseiddump
2660: } elsif ($userinput =~ /^courseiddump/) {
2661: if(isClient) {
2662: my ($cmd,$udom,$since,$description)
2663: =split(/:/,$userinput);
2664: if (defined($description)) {
2665: $description=&unescape($description);
2666: } else {
2667: $description='.';
2668: }
2669: unless (defined($since)) { $since=0; }
2670: my $qresult='';
2671: my $proname=
2672: "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
2673: my %hash;
2674: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
2675: while (my ($key,$value) = each(%hash)) {
2676: my ($descr,$lasttime,$inst_code);
2677: if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {
2678: ($descr,$inst_code,$lasttime)=($1,$2,$3);
2679: } else {
2680: ($descr,$lasttime) = split(/\:/,$value);
2681: }
2682: if ($lasttime<$since) { next; }
2683: if ($description eq '.') {
2684: $qresult.=$key.'='.$descr.':'.$inst_code.'&';
2685: } else {
2686: my $unescapeVal = &unescape($descr);
2687: if (eval('$unescapeVal=~/\Q$description\E/i')) {
2688: $qresult.=$key.'='.$descr.':'.$inst_code.'&';
2689: }
2690: }
2691: }
2692: if (untie(%hash)) {
2693: chop($qresult);
2694: print $client "$qresult\n";
2695: } else {
2696: print $client "error: ".($!+0)
2697: ." untie(GDBM) Failed ".
2698: "while attempting courseiddump\n";
2699: }
2700: } else {
2701: print $client "error: ".($!+0)
2702: ." tie(GDBM) Failed ".
2703: "while attempting courseiddump\n";
2704: }
2705: } else {
2706: Reply($client, "refused\n", $userinput);
2707:
2708: }
2709: # ----------------------------------------------------------------------- idput
2710: } elsif ($userinput =~ /^idput/) {
2711: if(isClient) {
2712: my ($cmd,$udom,$what)=split(/:/,$userinput);
2713: chomp($what);
2714: $udom=~s/\W//g;
2715: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
2716: my $now=time;
2717: my @pairs=split(/\&/,$what);
2718: my %hash;
2719: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
2720: {
2721: my $hfh;
2722: if ($hfh=IO::File->new(">>$proname.hist")) {
2723: print $hfh "P:$now:$what\n";
2724: }
2725: }
2726: foreach my $pair (@pairs) {
2727: my ($key,$value)=split(/=/,$pair);
2728: $hash{$key}=$value;
2729: }
2730: if (untie(%hash)) {
2731: print $client "ok\n";
2732: } else {
2733: print $client "error: ".($!+0)
2734: ." untie(GDBM) Failed ".
2735: "while attempting idput\n";
2736: }
2737: } else {
2738: print $client "error: ".($!+0)
2739: ." tie(GDBM) Failed ".
2740: "while attempting idput\n";
2741: }
2742: } else {
2743: Reply($client, "refused\n", $userinput);
2744:
2745: }
2746: # ----------------------------------------------------------------------- idget
2747: } elsif ($userinput =~ /^idget/) {
2748: if(isClient) {
2749: my ($cmd,$udom,$what)=split(/:/,$userinput);
2750: chomp($what);
2751: $udom=~s/\W//g;
2752: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
2753: my @queries=split(/\&/,$what);
2754: my $qresult='';
2755: my %hash;
2756: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
2757: for (my $i=0;$i<=$#queries;$i++) {
2758: $qresult.="$hash{$queries[$i]}&";
2759: }
2760: if (untie(%hash)) {
2761: $qresult=~s/\&$//;
2762: print $client "$qresult\n";
2763: } else {
2764: print $client "error: ".($!+0)
2765: ." untie(GDBM) Failed ".
2766: "while attempting idget\n";
2767: }
2768: } else {
2769: print $client "error: ".($!+0)
2770: ." tie(GDBM) Failed ".
2771: "while attempting idget\n";
2772: }
2773: } else {
2774: Reply($client, "refused\n", $userinput);
2775:
2776: }
2777: # ---------------------------------------------------------------------- tmpput
2778: } elsif ($userinput =~ /^tmpput/) {
2779: if(isClient) {
2780: my ($cmd,$what)=split(/:/,$userinput);
2781: my $store;
2782: $tmpsnum++;
2783: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
2784: $id=~s/\W/\_/g;
2785: $what=~s/\n//g;
2786: my $execdir=$perlvar{'lonDaemons'};
2787: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
2788: print $store $what;
2789: close $store;
2790: print $client "$id\n";
2791: }
2792: else {
2793: print $client "error: ".($!+0)
2794: ."IO::File->new Failed ".
2795: "while attempting tmpput\n";
2796: }
2797: } else {
2798: Reply($client, "refused\n", $userinput);
2799:
2800: }
2801:
2802: # ---------------------------------------------------------------------- tmpget
2803: } elsif ($userinput =~ /^tmpget/) {
2804: if(isClient) {
2805: my ($cmd,$id)=split(/:/,$userinput);
2806: chomp($id);
2807: $id=~s/\W/\_/g;
2808: my $store;
2809: my $execdir=$perlvar{'lonDaemons'};
2810: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
2811: my $reply=<$store>;
2812: print $client "$reply\n";
2813: close $store;
2814: }
2815: else {
2816: print $client "error: ".($!+0)
2817: ."IO::File->new Failed ".
2818: "while attempting tmpget\n";
2819: }
2820: } else {
2821: Reply($client, "refused\n", $userinput);
2822:
2823: }
2824: # ---------------------------------------------------------------------- tmpdel
2825: } elsif ($userinput =~ /^tmpdel/) {
2826: if(isClient) {
2827: my ($cmd,$id)=split(/:/,$userinput);
2828: chomp($id);
2829: $id=~s/\W/\_/g;
2830: my $execdir=$perlvar{'lonDaemons'};
2831: if (unlink("$execdir/tmp/$id.tmp")) {
2832: print $client "ok\n";
2833: } else {
2834: print $client "error: ".($!+0)
2835: ."Unlink tmp Failed ".
2836: "while attempting tmpdel\n";
2837: }
2838: } else {
2839: Reply($client, "refused\n", $userinput);
2840:
2841: }
2842: # ----------------------------------------- portfolio directory list (portls)
2843: } elsif ($userinput =~ /^portls/) {
2844: if(isClient) {
2845: my ($cmd,$uname,$udom)=split(/:/,$userinput);
2846: my $udir=propath($udom,$uname).'/userfiles/portfolio';
2847: my $dirLine='';
2848: my $dirContents='';
2849: if (opendir(LSDIR,$udir.'/')){
2850: while ($dirLine = readdir(LSDIR)){
2851: $dirContents = $dirContents.$dirLine.'<br />';
2852: }
2853: } else {
2854: $dirContents = "No directory found\n";
2855: }
2856: print $client $dirContents."\n";
2857: } else {
2858: Reply($client, "refused\n", $userinput);
2859: }
2860: # -------------------------------------------------------------------------- ls
2861: } elsif ($userinput =~ /^ls/) {
2862: if(isClient) {
2863: my $obs;
2864: my $rights;
2865: my ($cmd,$ulsdir)=split(/:/,$userinput);
2866: my $ulsout='';
2867: my $ulsfn;
2868: if (-e $ulsdir) {
2869: if(-d $ulsdir) {
2870: if (opendir(LSDIR,$ulsdir)) {
2871: while ($ulsfn=readdir(LSDIR)) {
2872: undef $obs, $rights;
2873: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
2874: #We do some obsolete checking here
2875: if(-e $ulsdir.'/'.$ulsfn.".meta") {
2876: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
2877: my @obsolete=<FILE>;
2878: foreach my $obsolete (@obsolete) {
2879: if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
2880: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
2881: }
2882: }
2883: $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
2884: if($obs eq '1') { $ulsout.="&1"; }
2885: else { $ulsout.="&0"; }
2886: if($rights eq '1') { $ulsout.="&1:"; }
2887: else { $ulsout.="&0:"; }
2888: }
2889: closedir(LSDIR);
2890: }
2891: } else {
2892: my @ulsstats=stat($ulsdir);
2893: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
2894: }
2895: } else {
2896: $ulsout='no_such_dir';
2897: }
2898: if ($ulsout eq '') { $ulsout='empty'; }
2899: print $client "$ulsout\n";
2900: } else {
2901: Reply($client, "refused\n", $userinput);
2902:
2903: }
2904: # ----------------------------------------------------------------- setannounce
2905: } elsif ($userinput =~ /^setannounce/) {
2906: if (isClient) {
2907: my ($cmd,$announcement)=split(/:/,$userinput);
2908: chomp($announcement);
2909: $announcement=&unescape($announcement);
2910: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
2911: '/announcement.txt')) {
2912: print $store $announcement;
2913: close $store;
2914: print $client "ok\n";
2915: } else {
2916: print $client "error: ".($!+0)."\n";
2917: }
2918: } else {
2919: Reply($client, "refused\n", $userinput);
2920:
2921: }
2922: # ------------------------------------------------------------------ Hanging up
2923: } elsif (($userinput =~ /^exit/) ||
2924: ($userinput =~ /^init/)) { # no restrictions.
2925: &logthis(
2926: "Client $clientip ($clientname) hanging up: $userinput");
2927: print $client "bye\n";
2928: $client->shutdown(2); # shutdown the socket forcibly.
2929: $client->close();
2930: return 0;
2931:
2932: # ---------------------------------- set current host/domain
2933: } elsif ($userinput =~ /^sethost:/) {
2934: if (isClient) {
2935: print $client &sethost($userinput)."\n";
2936: } else {
2937: print $client "refused\n";
2938: }
2939: #---------------------------------- request file (?) version.
2940: } elsif ($userinput =~/^version:/) {
2941: if (isClient) {
2942: print $client &version($userinput)."\n";
2943: } else {
2944: print $client "refused\n";
2945: }
2946: #------------------------------- is auto-enrollment enabled?
2947: } elsif ($userinput =~/^autorun:/) {
2948: if (isClient) {
2949: my ($cmd,$cdom) = split(/:/,$userinput);
2950: my $outcome = &localenroll::run($cdom);
2951: print $client "$outcome\n";
2952: } else {
2953: print $client "0\n";
2954: }
2955: #------------------------------- get official sections (for auto-enrollment).
2956: } elsif ($userinput =~/^autogetsections:/) {
2957: if (isClient) {
2958: my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
2959: my @secs = &localenroll::get_sections($coursecode,$cdom);
2960: my $seclist = &escape(join(':',@secs));
2961: print $client "$seclist\n";
2962: } else {
2963: print $client "refused\n";
2964: }
2965: #----------------------- validate owner of new course section (for auto-enrollment).
2966: } elsif ($userinput =~/^autonewcourse:/) {
2967: if (isClient) {
2968: my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
2969: my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
2970: print $client "$outcome\n";
2971: } else {
2972: print $client "refused\n";
2973: }
2974: #-------------- validate course section in schedule of classes (for auto-enrollment).
2975: } elsif ($userinput =~/^autovalidatecourse:/) {
2976: if (isClient) {
2977: my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
2978: my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
2979: print $client "$outcome\n";
2980: } else {
2981: print $client "refused\n";
2982: }
2983: #--------------------------- create password for new user (for auto-enrollment).
2984: } elsif ($userinput =~/^autocreatepassword:/) {
2985: if (isClient) {
2986: my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
2987: my ($create_passwd,$authchk);
2988: ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);
2989: print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
2990: } else {
2991: print $client "refused\n";
2992: }
2993: #--------------------------- read and remove temporary files (for auto-enrollment).
2994: } elsif ($userinput =~/^autoretrieve:/) {
2995: if (isClient) {
2996: my ($cmd,$filename) = split(/:/,$userinput);
2997: my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
2998: if ( (-e $source) && ($filename ne '') ) {
2999: my $reply = '';
3000: if (open(my $fh,$source)) {
3001: while (<$fh>) {
3002: chomp($_);
3003: $_ =~ s/^\s+//g;
3004: $_ =~ s/\s+$//g;
3005: $reply .= $_;
3006: }
3007: close($fh);
3008: print $client &escape($reply)."\n";
3009: # unlink($source);
3010: } else {
3011: print $client "error\n";
3012: }
3013: } else {
3014: print $client "error\n";
3015: }
3016: } else {
3017: print $client "refused\n";
3018: }
3019: #--------------------- read and retrieve institutional code format (for support form).
3020: } elsif ($userinput =~/^autoinstcodeformat:/) {
3021: if (isClient) {
3022: my $reply;
3023: my($cmd,$cdom,$course) = split(/:/,$userinput);
3024: my @pairs = split/\&/,$course;
3025: my %instcodes = ();
3026: my %codes = ();
3027: my @codetitles = ();
3028: my %cat_titles = ();
3029: my %cat_order = ();
3030: foreach (@pairs) {
3031: my ($key,$value) = split/=/,$_;
3032: $instcodes{&unescape($key)} = &unescape($value);
3033: }
3034: my $formatreply = &localenroll::instcode_format($cdom,\%instcodes,\%codes,\@codetitles,\%cat_titles,\%cat_order);
3035: if ($formatreply eq 'ok') {
3036: my $codes_str = &hash2str(%codes);
3037: my $codetitles_str = &array2str(@codetitles);
3038: my $cat_titles_str = &hash2str(%cat_titles);
3039: my $cat_order_str = &hash2str(%cat_order);
3040: print $client $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'.$cat_order_str."\n";
3041: }
3042: } else {
3043: print $client "refused\n";
3044: }
3045: # ------------------------------------------------------------- unknown command
3046:
3047: } else {
3048: # unknown command
3049: print $client "unknown_cmd\n";
3050: }
3051: # -------------------------------------------------------------------- complete
3052: Debug("process_request - returning 1");
3053: return 1;
3054: }
3055: #
3056: # Decipher encoded traffic
3057: # Parameters:
3058: # input - Encoded data.
3059: # Returns:
3060: # Decoded data or undef if encryption key was not yet negotiated.
3061: # Implicit input:
3062: # cipher - This global holds the negotiated encryption key.
3063: #
3064: sub decipher {
3065: my ($input) = @_;
3066: my $output = '';
3067:
3068:
3069: if($cipher) {
3070: my($enc, $enclength, $encinput) = split(/:/, $input);
3071: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
3072: $output .=
3073: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
3074: }
3075: return substr($output, 0, $enclength);
3076: } else {
3077: return undef;
3078: }
3079: }
3080:
3081: #
3082: # Register a command processor. This function is invoked to register a sub
3083: # to process a request. Once registered, the ProcessRequest sub can automatically
3084: # dispatch requests to an appropriate sub, and do the top level validity checking
3085: # as well:
3086: # - Is the keyword recognized.
3087: # - Is the proper client type attempting the request.
3088: # - Is the request encrypted if it has to be.
3089: # Parameters:
3090: # $request_name - Name of the request being registered.
3091: # This is the command request that will match
3092: # against the hash keywords to lookup the information
3093: # associated with the dispatch information.
3094: # $procedure - Reference to a sub to call to process the request.
3095: # All subs get called as follows:
3096: # Procedure($cmd, $tail, $replyfd, $key)
3097: # $cmd - the actual keyword that invoked us.
3098: # $tail - the tail of the request that invoked us.
3099: # $replyfd- File descriptor connected to the client
3100: # $must_encode - True if the request must be encoded to be good.
3101: # $client_ok - True if it's ok for a client to request this.
3102: # $manager_ok - True if it's ok for a manager to request this.
3103: # Side effects:
3104: # - On success, the Dispatcher hash has an entry added for the key $RequestName
3105: # - On failure, the program will die as it's a bad internal bug to try to
3106: # register a duplicate command handler.
3107: #
3108: sub register_handler {
3109: my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_;
3110:
3111: # Don't allow duplication#
3112:
3113: if (defined $Dispatcher{$request_name}) {
3114: die "Attempting to define a duplicate request handler for $request_name\n";
3115: }
3116: # Build the client type mask:
3117:
3118: my $client_type_mask = 0;
3119: if($client_ok) {
3120: $client_type_mask |= $CLIENT_OK;
3121: }
3122: if($manager_ok) {
3123: $client_type_mask |= $MANAGER_OK;
3124: }
3125:
3126: # Enter the hash:
3127:
3128: my @entry = ($procedure, $must_encode, $client_type_mask);
3129:
3130: $Dispatcher{$request_name} = \@entry;
3131:
3132: }
3133:
3134:
3135: #------------------------------------------------------------------
3136:
3137:
3138:
3139:
3140: #
3141: # Convert an error return code from lcpasswd to a string value.
3142: #
3143: sub lcpasswdstrerror {
3144: my $ErrorCode = shift;
3145: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
3146: return "lcpasswd Unrecognized error return value ".$ErrorCode;
3147: } else {
3148: return $passwderrors[$ErrorCode];
3149: }
3150: }
3151:
3152: #
3153: # Convert an error return code from lcuseradd to a string value:
3154: #
3155: sub lcuseraddstrerror {
3156: my $ErrorCode = shift;
3157: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
3158: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
3159: } else {
3160: return $adderrors[$ErrorCode];
3161: }
3162: }
3163:
3164: # grabs exception and records it to log before exiting
3165: sub catchexception {
3166: my ($error)=@_;
3167: $SIG{'QUIT'}='DEFAULT';
3168: $SIG{__DIE__}='DEFAULT';
3169: &status("Catching exception");
3170: &logthis("<font color='red'>CRITICAL: "
3171: ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
3172: ."a crash with this error msg->[$error]</font>");
3173: &logthis('Famous last words: '.$status.' - '.$lastlog);
3174: if ($client) { print $client "error: $error\n"; }
3175: $server->close();
3176: die($error);
3177: }
3178: sub timeout {
3179: &status("Handling Timeout");
3180: &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
3181: &catchexception('Timeout');
3182: }
3183: # -------------------------------- Set signal handlers to record abnormal exits
3184:
3185:
3186: $SIG{'QUIT'}=\&catchexception;
3187: $SIG{__DIE__}=\&catchexception;
3188:
3189: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
3190: &status("Read loncapa.conf and loncapa_apache.conf");
3191: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
3192: %perlvar=%{$perlvarref};
3193: undef $perlvarref;
3194:
3195: # ----------------------------- Make sure this process is running from user=www
3196: my $wwwid=getpwnam('www');
3197: if ($wwwid!=$<) {
3198: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
3199: my $subj="LON: $currenthostid User ID mismatch";
3200: system("echo 'User ID mismatch. lond must be run as user www.' |\
3201: mailto $emailto -s '$subj' > /dev/null");
3202: exit 1;
3203: }
3204:
3205: # --------------------------------------------- Check if other instance running
3206:
3207: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
3208:
3209: if (-e $pidfile) {
3210: my $lfh=IO::File->new("$pidfile");
3211: my $pide=<$lfh>;
3212: chomp($pide);
3213: if (kill 0 => $pide) { die "already running"; }
3214: }
3215:
3216: # ------------------------------------------------------------- Read hosts file
3217:
3218:
3219:
3220: # establish SERVER socket, bind and listen.
3221: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
3222: Type => SOCK_STREAM,
3223: Proto => 'tcp',
3224: Reuse => 1,
3225: Listen => 10 )
3226: or die "making socket: $@\n";
3227:
3228: # --------------------------------------------------------- Do global variables
3229:
3230: # global variables
3231:
3232: my %children = (); # keys are current child process IDs
3233:
3234: sub REAPER { # takes care of dead children
3235: $SIG{CHLD} = \&REAPER;
3236: &status("Handling child death");
3237: my $pid;
3238: do {
3239: $pid = waitpid(-1,&WNOHANG());
3240: if (defined($children{$pid})) {
3241: &logthis("Child $pid died");
3242: delete($children{$pid});
3243: } elsif ($pid > 0) {
3244: &logthis("Unknown Child $pid died");
3245: }
3246: } while ( $pid > 0 );
3247: foreach my $child (keys(%children)) {
3248: $pid = waitpid($child,&WNOHANG());
3249: if ($pid > 0) {
3250: &logthis("Child $child - $pid looks like we missed it's death");
3251: delete($children{$pid});
3252: }
3253: }
3254: &status("Finished Handling child death");
3255: }
3256:
3257: sub HUNTSMAN { # signal handler for SIGINT
3258: &status("Killing children (INT)");
3259: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
3260: kill 'INT' => keys %children;
3261: &logthis("Free socket: ".shutdown($server,2)); # free up socket
3262: my $execdir=$perlvar{'lonDaemons'};
3263: unlink("$execdir/logs/lond.pid");
3264: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
3265: &status("Done killing children");
3266: exit; # clean up with dignity
3267: }
3268:
3269: sub HUPSMAN { # signal handler for SIGHUP
3270: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
3271: &status("Killing children for restart (HUP)");
3272: kill 'INT' => keys %children;
3273: &logthis("Free socket: ".shutdown($server,2)); # free up socket
3274: &logthis("<font color='red'>CRITICAL: Restarting</font>");
3275: my $execdir=$perlvar{'lonDaemons'};
3276: unlink("$execdir/logs/lond.pid");
3277: &status("Restarting self (HUP)");
3278: exec("$execdir/lond"); # here we go again
3279: }
3280:
3281: #
3282: # Kill off hashes that describe the host table prior to re-reading it.
3283: # Hashes affected are:
3284: # %hostid, %hostdom %hostip %hostdns.
3285: #
3286: sub KillHostHashes {
3287: foreach my $key (keys %hostid) {
3288: delete $hostid{$key};
3289: }
3290: foreach my $key (keys %hostdom) {
3291: delete $hostdom{$key};
3292: }
3293: foreach my $key (keys %hostip) {
3294: delete $hostip{$key};
3295: }
3296: foreach my $key (keys %hostdns) {
3297: delete $hostdns{$key};
3298: }
3299: }
3300: #
3301: # Read in the host table from file and distribute it into the various hashes:
3302: #
3303: # - %hostid - Indexed by IP, the loncapa hostname.
3304: # - %hostdom - Indexed by loncapa hostname, the domain.
3305: # - %hostip - Indexed by hostid, the Ip address of the host.
3306: sub ReadHostTable {
3307:
3308: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
3309: my $myloncapaname = $perlvar{'lonHostID'};
3310: Debug("My loncapa name is : $myloncapaname");
3311: while (my $configline=<CONFIG>) {
3312: if (!($configline =~ /^\s*\#/)) {
3313: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
3314: chomp($ip); $ip=~s/\D+$//;
3315: $hostid{$ip}=$id; # LonCAPA name of host by IP.
3316: $hostdom{$id}=$domain; # LonCAPA domain name of host.
3317: $hostip{$id}=$ip; # IP address of host.
3318: $hostdns{$name} = $id; # LonCAPA name of host by DNS.
3319:
3320: if ($id eq $perlvar{'lonHostID'}) {
3321: Debug("Found me in the host table: $name");
3322: $thisserver=$name;
3323: }
3324: }
3325: }
3326: close(CONFIG);
3327: }
3328: #
3329: # Reload the Apache daemon's state.
3330: # This is done by invoking /home/httpd/perl/apachereload
3331: # a setuid perl script that can be root for us to do this job.
3332: #
3333: sub ReloadApache {
3334: my $execdir = $perlvar{'lonDaemons'};
3335: my $script = $execdir."/apachereload";
3336: system($script);
3337: }
3338:
3339: #
3340: # Called in response to a USR2 signal.
3341: # - Reread hosts.tab
3342: # - All children connected to hosts that were removed from hosts.tab
3343: # are killed via SIGINT
3344: # - All children connected to previously existing hosts are sent SIGUSR1
3345: # - Our internal hosts hash is updated to reflect the new contents of
3346: # hosts.tab causing connections from hosts added to hosts.tab to
3347: # now be honored.
3348: #
3349: sub UpdateHosts {
3350: &status("Reload hosts.tab");
3351: logthis('<font color="blue"> Updating connections </font>');
3352: #
3353: # The %children hash has the set of IP's we currently have children
3354: # on. These need to be matched against records in the hosts.tab
3355: # Any ip's no longer in the table get killed off they correspond to
3356: # either dropped or changed hosts. Note that the re-read of the table
3357: # will take care of new and changed hosts as connections come into being.
3358:
3359:
3360: KillHostHashes;
3361: ReadHostTable;
3362:
3363: foreach my $child (keys %children) {
3364: my $childip = $children{$child};
3365: if(!$hostid{$childip}) {
3366: logthis('<font color="blue"> UpdateHosts killing child '
3367: ." $child for ip $childip </font>");
3368: kill('INT', $child);
3369: } else {
3370: logthis('<font color="green"> keeping child for ip '
3371: ." $childip (pid=$child) </font>");
3372: }
3373: }
3374: ReloadApache;
3375: &status("Finished reloading hosts.tab");
3376: }
3377:
3378:
3379: sub checkchildren {
3380: &status("Checking on the children (sending signals)");
3381: &initnewstatus();
3382: &logstatus();
3383: &logthis('Going to check on the children');
3384: my $docdir=$perlvar{'lonDocRoot'};
3385: foreach (sort keys %children) {
3386: #sleep 1;
3387: unless (kill 'USR1' => $_) {
3388: &logthis ('Child '.$_.' is dead');
3389: &logstatus($$.' is dead');
3390: delete($children{$_});
3391: }
3392: }
3393: sleep 5;
3394: $SIG{ALRM} = sub { Debug("timeout");
3395: die "timeout"; };
3396: $SIG{__DIE__} = 'DEFAULT';
3397: &status("Checking on the children (waiting for reports)");
3398: foreach (sort keys %children) {
3399: unless (-e "$docdir/lon-status/londchld/$_.txt") {
3400: eval {
3401: alarm(300);
3402: &logthis('Child '.$_.' did not respond');
3403: kill 9 => $_;
3404: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
3405: #$subj="LON: $currenthostid killed lond process $_";
3406: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
3407: #$execdir=$perlvar{'lonDaemons'};
3408: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
3409: delete($children{$_});
3410: alarm(0);
3411: }
3412: }
3413: }
3414: $SIG{ALRM} = 'DEFAULT';
3415: $SIG{__DIE__} = \&catchexception;
3416: &status("Finished checking children");
3417: &logthis('Finished Checking children');
3418: }
3419:
3420: # --------------------------------------------------------------------- Logging
3421:
3422: sub logthis {
3423: my $message=shift;
3424: my $execdir=$perlvar{'lonDaemons'};
3425: my $fh=IO::File->new(">>$execdir/logs/lond.log");
3426: my $now=time;
3427: my $local=localtime($now);
3428: $lastlog=$local.': '.$message;
3429: print $fh "$local ($$): $message\n";
3430: }
3431:
3432: # ------------------------- Conditional log if $DEBUG true.
3433: sub Debug {
3434: my $message = shift;
3435: if($DEBUG) {
3436: &logthis($message);
3437: }
3438: }
3439:
3440: #
3441: # Sub to do replies to client.. this gives a hook for some
3442: # debug tracing too:
3443: # Parameters:
3444: # fd - File open on client.
3445: # reply - Text to send to client.
3446: # request - Original request from client.
3447: #
3448: sub Reply {
3449: my ($fd, $reply, $request) = @_;
3450: print $fd $reply;
3451: Debug("Request was $request Reply was $reply");
3452:
3453: $Transactions++;
3454:
3455:
3456: }
3457:
3458:
3459: #
3460: # Sub to report a failure.
3461: # This function:
3462: # - Increments the failure statistic counters.
3463: # - Invokes Reply to send the error message to the client.
3464: # Parameters:
3465: # fd - File descriptor open on the client
3466: # reply - Reply text to emit.
3467: # request - The original request message (used by Reply
3468: # to debug if that's enabled.
3469: # Implicit outputs:
3470: # $Failures- The number of failures is incremented.
3471: # Reply (invoked here) sends a message to the
3472: # client:
3473: #
3474: sub Failure {
3475: my $fd = shift;
3476: my $reply = shift;
3477: my $request = shift;
3478:
3479: $Failures++;
3480: Reply($fd, $reply, $request); # That's simple eh?
3481: }
3482: # ------------------------------------------------------------------ Log status
3483:
3484: sub logstatus {
3485: &status("Doing logging");
3486: my $docdir=$perlvar{'lonDocRoot'};
3487: {
3488: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
3489: print $fh $status."\n".$lastlog."\n".time."\n$keymode";
3490: $fh->close();
3491: }
3492: &status("Finished $$.txt");
3493: {
3494: open(LOG,">>$docdir/lon-status/londstatus.txt");
3495: flock(LOG,LOCK_EX);
3496: print LOG $$."\t".$clientname."\t".$currenthostid."\t"
3497: .$status."\t".$lastlog."\t $keymode\n";
3498: flock(DB,LOCK_UN);
3499: close(LOG);
3500: }
3501: &status("Finished logging");
3502: }
3503:
3504: sub initnewstatus {
3505: my $docdir=$perlvar{'lonDocRoot'};
3506: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
3507: my $now=time;
3508: my $local=localtime($now);
3509: print $fh "LOND status $local - parent $$\n\n";
3510: opendir(DIR,"$docdir/lon-status/londchld");
3511: while (my $filename=readdir(DIR)) {
3512: unlink("$docdir/lon-status/londchld/$filename");
3513: }
3514: closedir(DIR);
3515: }
3516:
3517: # -------------------------------------------------------------- Status setting
3518:
3519: sub status {
3520: my $what=shift;
3521: my $now=time;
3522: my $local=localtime($now);
3523: $status=$local.': '.$what;
3524: $0='lond: '.$what.' '.$local;
3525: }
3526:
3527: # -------------------------------------------------------- Escape Special Chars
3528:
3529: sub escape {
3530: my $str=shift;
3531: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
3532: return $str;
3533: }
3534:
3535: # ----------------------------------------------------- Un-Escape Special Chars
3536:
3537: sub unescape {
3538: my $str=shift;
3539: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
3540: return $str;
3541: }
3542:
3543: # ----------------------------------------------------------- Send USR1 to lonc
3544:
3545: sub reconlonc {
3546: my $peerfile=shift;
3547: &logthis("Trying to reconnect for $peerfile");
3548: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
3549: if (my $fh=IO::File->new("$loncfile")) {
3550: my $loncpid=<$fh>;
3551: chomp($loncpid);
3552: if (kill 0 => $loncpid) {
3553: &logthis("lonc at pid $loncpid responding, sending USR1");
3554: kill USR1 => $loncpid;
3555: } else {
3556: &logthis(
3557: "<font color='red'>CRITICAL: "
3558: ."lonc at pid $loncpid not responding, giving up</font>");
3559: }
3560: } else {
3561: &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
3562: }
3563: }
3564:
3565: # -------------------------------------------------- Non-critical communication
3566:
3567: sub subreply {
3568: my ($cmd,$server)=@_;
3569: my $peerfile="$perlvar{'lonSockDir'}/$server";
3570: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
3571: Type => SOCK_STREAM,
3572: Timeout => 10)
3573: or return "con_lost";
3574: print $sclient "$cmd\n";
3575: my $answer=<$sclient>;
3576: chomp($answer);
3577: if (!$answer) { $answer="con_lost"; }
3578: return $answer;
3579: }
3580:
3581: sub reply {
3582: my ($cmd,$server)=@_;
3583: my $answer;
3584: if ($server ne $currenthostid) {
3585: $answer=subreply($cmd,$server);
3586: if ($answer eq 'con_lost') {
3587: $answer=subreply("ping",$server);
3588: if ($answer ne $server) {
3589: &logthis("sub reply: answer != server answer is $answer, server is $server");
3590: &reconlonc("$perlvar{'lonSockDir'}/$server");
3591: }
3592: $answer=subreply($cmd,$server);
3593: }
3594: } else {
3595: $answer='self_reply';
3596: }
3597: return $answer;
3598: }
3599:
3600: # -------------------------------------------------------------- Talk to lonsql
3601:
3602: sub sqlreply {
3603: my ($cmd)=@_;
3604: my $answer=subsqlreply($cmd);
3605: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
3606: return $answer;
3607: }
3608:
3609: sub subsqlreply {
3610: my ($cmd)=@_;
3611: my $unixsock="mysqlsock";
3612: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
3613: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
3614: Type => SOCK_STREAM,
3615: Timeout => 10)
3616: or return "con_lost";
3617: print $sclient "$cmd\n";
3618: my $answer=<$sclient>;
3619: chomp($answer);
3620: if (!$answer) { $answer="con_lost"; }
3621: return $answer;
3622: }
3623:
3624: # -------------------------------------------- Return path to profile directory
3625:
3626: sub propath {
3627: my ($udom,$uname)=@_;
3628: $udom=~s/\W//g;
3629: $uname=~s/\W//g;
3630: my $subdir=$uname.'__';
3631: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
3632: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
3633: return $proname;
3634: }
3635:
3636: # --------------------------------------- Is this the home server of an author?
3637:
3638: sub ishome {
3639: my $author=shift;
3640: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
3641: my ($udom,$uname)=split(/\//,$author);
3642: my $proname=propath($udom,$uname);
3643: if (-e $proname) {
3644: return 'owner';
3645: } else {
3646: return 'not_owner';
3647: }
3648: }
3649:
3650: # ======================================================= Continue main program
3651: # ---------------------------------------------------- Fork once and dissociate
3652:
3653: my $fpid=fork;
3654: exit if $fpid;
3655: die "Couldn't fork: $!" unless defined ($fpid);
3656:
3657: POSIX::setsid() or die "Can't start new session: $!";
3658:
3659: # ------------------------------------------------------- Write our PID on disk
3660:
3661: my $execdir=$perlvar{'lonDaemons'};
3662: open (PIDSAVE,">$execdir/logs/lond.pid");
3663: print PIDSAVE "$$\n";
3664: close(PIDSAVE);
3665: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
3666: &status('Starting');
3667:
3668:
3669:
3670: # ----------------------------------------------------- Install signal handlers
3671:
3672:
3673: $SIG{CHLD} = \&REAPER;
3674: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
3675: $SIG{HUP} = \&HUPSMAN;
3676: $SIG{USR1} = \&checkchildren;
3677: $SIG{USR2} = \&UpdateHosts;
3678:
3679: # Read the host hashes:
3680:
3681: ReadHostTable;
3682:
3683: # --------------------------------------------------------------
3684: # Accept connections. When a connection comes in, it is validated
3685: # and if good, a child process is created to process transactions
3686: # along the connection.
3687:
3688: while (1) {
3689: &status('Starting accept');
3690: $client = $server->accept() or next;
3691: &status('Accepted '.$client.' off to spawn');
3692: make_new_child($client);
3693: &status('Finished spawning');
3694: }
3695:
3696: sub make_new_child {
3697: my $pid;
3698: # my $cipher; # Now global
3699: my $sigset;
3700:
3701: $client = shift;
3702: &status('Starting new child '.$client);
3703: &logthis('<font color="green"> Attempting to start child ('.$client.
3704: ")</font>");
3705: # block signal for fork
3706: $sigset = POSIX::SigSet->new(SIGINT);
3707: sigprocmask(SIG_BLOCK, $sigset)
3708: or die "Can't block SIGINT for fork: $!\n";
3709:
3710: die "fork: $!" unless defined ($pid = fork);
3711:
3712: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
3713: # connection liveness.
3714:
3715: #
3716: # Figure out who we're talking to so we can record the peer in
3717: # the pid hash.
3718: #
3719: my $caller = getpeername($client);
3720: my ($port,$iaddr);
3721: if (defined($caller) && length($caller) > 0) {
3722: ($port,$iaddr)=unpack_sockaddr_in($caller);
3723: } else {
3724: &logthis("Unable to determine who caller was, getpeername returned nothing");
3725: }
3726: if (defined($iaddr)) {
3727: $clientip = inet_ntoa($iaddr);
3728: Debug("Connected with $clientip");
3729: $clientdns = gethostbyaddr($iaddr, AF_INET);
3730: Debug("Connected with $clientdns by name");
3731: } else {
3732: &logthis("Unable to determine clientip");
3733: $clientip='Unavailable';
3734: }
3735:
3736: if ($pid) {
3737: # Parent records the child's birth and returns.
3738: sigprocmask(SIG_UNBLOCK, $sigset)
3739: or die "Can't unblock SIGINT for fork: $!\n";
3740: $children{$pid} = $clientip;
3741: &status('Started child '.$pid);
3742: return;
3743: } else {
3744: # Child can *not* return from this subroutine.
3745: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
3746: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
3747: #don't get intercepted
3748: $SIG{USR1}= \&logstatus;
3749: $SIG{ALRM}= \&timeout;
3750: $lastlog='Forked ';
3751: $status='Forked';
3752:
3753: # unblock signals
3754: sigprocmask(SIG_UNBLOCK, $sigset)
3755: or die "Can't unblock SIGINT for fork: $!\n";
3756:
3757: # my $tmpsnum=0; # Now global
3758: #---------------------------------------------------- kerberos 5 initialization
3759: &Authen::Krb5::init_context();
3760: &Authen::Krb5::init_ets();
3761:
3762: &status('Accepted connection');
3763: # =============================================================================
3764: # do something with the connection
3765: # -----------------------------------------------------------------------------
3766: # see if we know client and 'check' for spoof IP by ineffective challenge
3767:
3768: ReadManagerTable; # May also be a manager!!
3769:
3770: my $clientrec=($hostid{$clientip} ne undef);
3771: my $ismanager=($managers{$clientip} ne undef);
3772: $clientname = "[unknonwn]";
3773: if($clientrec) { # Establish client type.
3774: $ConnectionType = "client";
3775: $clientname = $hostid{$clientip};
3776: if($ismanager) {
3777: $ConnectionType = "both";
3778: }
3779: } else {
3780: $ConnectionType = "manager";
3781: $clientname = $managers{$clientip};
3782: }
3783: my $clientok;
3784:
3785: if ($clientrec || $ismanager) {
3786: &status("Waiting for init from $clientip $clientname");
3787: &logthis('<font color="yellow">INFO: Connection, '.
3788: $clientip.
3789: " ($clientname) connection type = $ConnectionType </font>" );
3790: &status("Connecting $clientip ($clientname))");
3791: my $remotereq=<$client>;
3792: chomp($remotereq);
3793: Debug("Got init: $remotereq");
3794: my $inikeyword = split(/:/, $remotereq);
3795: if ($remotereq =~ /^init/) {
3796: &sethost("sethost:$perlvar{'lonHostID'}");
3797: #
3798: # If the remote is attempting a local init... give that a try:
3799: #
3800: my ($i, $inittype) = split(/:/, $remotereq);
3801:
3802: # If the connection type is ssl, but I didn't get my
3803: # certificate files yet, then I'll drop back to
3804: # insecure (if allowed).
3805:
3806: if($inittype eq "ssl") {
3807: my ($ca, $cert) = lonssl::CertificateFile;
3808: my $kfile = lonssl::KeyFile;
3809: if((!$ca) ||
3810: (!$cert) ||
3811: (!$kfile)) {
3812: $inittype = ""; # This forces insecure attempt.
3813: &logthis("<font color=\"blue\"> Certificates not "
3814: ."installed -- trying insecure auth</font>");
3815: } else { # SSL certificates are in place so
3816: } # Leave the inittype alone.
3817: }
3818:
3819: if($inittype eq "local") {
3820: my $key = LocalConnection($client, $remotereq);
3821: if($key) {
3822: Debug("Got local key $key");
3823: $clientok = 1;
3824: my $cipherkey = pack("H32", $key);
3825: $cipher = new IDEA($cipherkey);
3826: print $client "ok:local\n";
3827: &logthis('<font color="green"'
3828: . "Successful local authentication </font>");
3829: $keymode = "local"
3830: } else {
3831: Debug("Failed to get local key");
3832: $clientok = 0;
3833: shutdown($client, 3);
3834: close $client;
3835: }
3836: } elsif ($inittype eq "ssl") {
3837: my $key = SSLConnection($client);
3838: if ($key) {
3839: $clientok = 1;
3840: my $cipherkey = pack("H32", $key);
3841: $cipher = new IDEA($cipherkey);
3842: &logthis('<font color="green">'
3843: ."Successfull ssl authentication with $clientname </font>");
3844: $keymode = "ssl";
3845:
3846: } else {
3847: $clientok = 0;
3848: close $client;
3849: }
3850:
3851: } else {
3852: my $ok = InsecureConnection($client);
3853: if($ok) {
3854: $clientok = 1;
3855: &logthis('<font color="green">'
3856: ."Successful insecure authentication with $clientname </font>");
3857: print $client "ok\n";
3858: $keymode = "insecure";
3859: } else {
3860: &logthis('<font color="yellow">'
3861: ."Attempted insecure connection disallowed </font>");
3862: close $client;
3863: $clientok = 0;
3864:
3865: }
3866: }
3867: } else {
3868: &logthis(
3869: "<font color='blue'>WARNING: "
3870: ."$clientip failed to initialize: >$remotereq< </font>");
3871: &status('No init '.$clientip);
3872: }
3873:
3874: } else {
3875: &logthis(
3876: "<font color='blue'>WARNING: Unknown client $clientip</font>");
3877: &status('Hung up on '.$clientip);
3878: }
3879:
3880: if ($clientok) {
3881: # ---------------- New known client connecting, could mean machine online again
3882:
3883: foreach my $id (keys(%hostip)) {
3884: if ($hostip{$id} ne $clientip ||
3885: $hostip{$currenthostid} eq $clientip) {
3886: # no need to try to do recon's to myself
3887: next;
3888: }
3889: &reconlonc("$perlvar{'lonSockDir'}/$id");
3890: }
3891: &logthis("<font color='green'>Established connection: $clientname</font>");
3892: &status('Will listen to '.$clientname);
3893: # ------------------------------------------------------------ Process requests
3894: my $keep_going = 1;
3895: my $user_input;
3896: while(($user_input = get_request) && $keep_going) {
3897: alarm(120);
3898: Debug("Main: Got $user_input\n");
3899: $keep_going = &process_request($user_input);
3900: alarm(0);
3901: &status('Listening to '.$clientname." ($keymode)");
3902: }
3903:
3904: # --------------------------------------------- client unknown or fishy, refuse
3905: } else {
3906: print $client "refused\n";
3907: $client->close();
3908: &logthis("<font color='blue'>WARNING: "
3909: ."Rejected client $clientip, closing connection</font>");
3910: }
3911: }
3912:
3913: # =============================================================================
3914:
3915: &logthis("<font color='red'>CRITICAL: "
3916: ."Disconnect from $clientip ($clientname)</font>");
3917:
3918:
3919: # this exit is VERY important, otherwise the child will become
3920: # a producer of more and more children, forking yourself into
3921: # process death.
3922: exit;
3923:
3924: }
3925:
3926:
3927: #
3928: # Checks to see if the input roleput request was to set
3929: # an author role. If so, invokes the lchtmldir script to set
3930: # up a correct public_html
3931: # Parameters:
3932: # request - The request sent to the rolesput subchunk.
3933: # We're looking for /domain/_au
3934: # domain - The domain in which the user is having roles doctored.
3935: # user - Name of the user for which the role is being put.
3936: # authtype - The authentication type associated with the user.
3937: #
3938: sub ManagePermissions
3939: {
3940:
3941: my ($request, $domain, $user, $authtype) = @_;
3942:
3943: # See if the request is of the form /$domain/_au
3944: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
3945: my $execdir = $perlvar{'lonDaemons'};
3946: my $userhome= "/home/$user" ;
3947: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
3948: system("$execdir/lchtmldir $userhome $user $authtype");
3949: }
3950: }
3951:
3952:
3953: #
3954: # Return the full path of a user password file, whether it exists or not.
3955: # Parameters:
3956: # domain - Domain in which the password file lives.
3957: # user - name of the user.
3958: # Returns:
3959: # Full passwd path:
3960: #
3961: sub password_path {
3962: my ($domain, $user) = @_;
3963:
3964:
3965: my $path = &propath($domain, $user);
3966: $path .= "/passwd";
3967:
3968: return $path;
3969: }
3970:
3971: # Password Filename
3972: # Returns the path to a passwd file given domain and user... only if
3973: # it exists.
3974: # Parameters:
3975: # domain - Domain in which to search.
3976: # user - username.
3977: # Returns:
3978: # - If the password file exists returns its path.
3979: # - If the password file does not exist, returns undefined.
3980: #
3981: sub password_filename {
3982: my ($domain, $user) = @_;
3983:
3984: Debug ("PasswordFilename called: dom = $domain user = $user");
3985:
3986: my $path = &password_path($domain, $user);
3987: Debug("PasswordFilename got path: $path");
3988: if(-e $path) {
3989: return $path;
3990: } else {
3991: return undef;
3992: }
3993: }
3994:
3995: #
3996: # Rewrite the contents of the user's passwd file.
3997: # Parameters:
3998: # domain - domain of the user.
3999: # name - User's name.
4000: # contents - New contents of the file.
4001: # Returns:
4002: # 0 - Failed.
4003: # 1 - Success.
4004: #
4005: sub rewrite_password_file {
4006: my ($domain, $user, $contents) = @_;
4007:
4008: my $file = &password_filename($domain, $user);
4009: if (defined $file) {
4010: my $pf = IO::File->new(">$file");
4011: if($pf) {
4012: print $pf "$contents\n";
4013: return 1;
4014: } else {
4015: return 0;
4016: }
4017: } else {
4018: return 0;
4019: }
4020:
4021: }
4022:
4023: #
4024: # get_auth_type - Determines the authorization type of a user in a domain.
4025:
4026: # Returns the authorization type or nouser if there is no such user.
4027: #
4028: sub get_auth_type
4029: {
4030:
4031: my ($domain, $user) = @_;
4032:
4033: Debug("get_auth_type( $domain, $user ) \n");
4034: my $proname = &propath($domain, $user);
4035: my $passwdfile = "$proname/passwd";
4036: if( -e $passwdfile ) {
4037: my $pf = IO::File->new($passwdfile);
4038: my $realpassword = <$pf>;
4039: chomp($realpassword);
4040: Debug("Password info = $realpassword\n");
4041: my ($authtype, $contentpwd) = split(/:/, $realpassword);
4042: Debug("Authtype = $authtype, content = $contentpwd\n");
4043: my $availinfo = '';
4044: if($authtype eq 'krb4' or $authtype eq 'krb5') {
4045: $availinfo = $contentpwd;
4046: }
4047:
4048: return "$authtype:$availinfo";
4049: } else {
4050: Debug("Returning nouser");
4051: return "nouser";
4052: }
4053: }
4054:
4055: #
4056: # Validate a user given their domain, name and password. This utility
4057: # function is used by both AuthenticateHandler and ChangePasswordHandler
4058: # to validate the login credentials of a user.
4059: # Parameters:
4060: # $domain - The domain being logged into (this is required due to
4061: # the capability for multihomed systems.
4062: # $user - The name of the user being validated.
4063: # $password - The user's propoposed password.
4064: #
4065: # Returns:
4066: # 1 - The domain,user,pasword triplet corresponds to a valid
4067: # user.
4068: # 0 - The domain,user,password triplet is not a valid user.
4069: #
4070: sub validate_user {
4071: my ($domain, $user, $password) = @_;
4072:
4073:
4074: # Why negative ~pi you may well ask? Well this function is about
4075: # authentication, and therefore very important to get right.
4076: # I've initialized the flag that determines whether or not I've
4077: # validated correctly to a value it's not supposed to get.
4078: # At the end of this function. I'll ensure that it's not still that
4079: # value so we don't just wind up returning some accidental value
4080: # as a result of executing an unforseen code path that
4081: # did not set $validated.
4082:
4083: my $validated = -3.14159;
4084:
4085: # How we authenticate is determined by the type of authentication
4086: # the user has been assigned. If the authentication type is
4087: # "nouser", the user does not exist so we will return 0.
4088:
4089: my $contents = &get_auth_type($domain, $user);
4090: my ($howpwd, $contentpwd) = split(/:/, $contents);
4091:
4092: my $null = pack("C",0); # Used by kerberos auth types.
4093:
4094: if ($howpwd ne 'nouser') {
4095:
4096: if($howpwd eq "internal") { # Encrypted is in local password file.
4097: $validated = (crypt($password, $contentpwd) eq $contentpwd);
4098: }
4099: elsif ($howpwd eq "unix") { # User is a normal unix user.
4100: $contentpwd = (getpwnam($user))[1];
4101: if($contentpwd) {
4102: if($contentpwd eq 'x') { # Shadow password file...
4103: my $pwauth_path = "/usr/local/sbin/pwauth";
4104: open PWAUTH, "|$pwauth_path" or
4105: die "Cannot invoke authentication";
4106: print PWAUTH "$user\n$password\n";
4107: close PWAUTH;
4108: $validated = ! $?;
4109:
4110: } else { # Passwords in /etc/passwd.
4111: $validated = (crypt($password,
4112: $contentpwd) eq $contentpwd);
4113: }
4114: } else {
4115: $validated = 0;
4116: }
4117: }
4118: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
4119: if(! ($password =~ /$null/) ) {
4120: my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
4121: "",
4122: $contentpwd,,
4123: 'krbtgt',
4124: $contentpwd,
4125: 1,
4126: $password);
4127: if(!$k4error) {
4128: $validated = 1;
4129: } else {
4130: $validated = 0;
4131: &logthis('krb4: '.$user.', '.$contentpwd.', '.
4132: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
4133: }
4134: } else {
4135: $validated = 0; # Password has a match with null.
4136: }
4137: } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
4138: if(!($password =~ /$null/)) { # Null password not allowed.
4139: my $krbclient = &Authen::Krb5::parse_name($user.'@'
4140: .$contentpwd);
4141: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
4142: my $krbserver = &Authen::Krb5::parse_name($krbservice);
4143: my $credentials= &Authen::Krb5::cc_default();
4144: $credentials->initialize($krbclient);
4145: my $krbreturn = &Authen::KRb5::get_in_tkt_with_password($krbclient,
4146: $krbserver,
4147: $password,
4148: $credentials);
4149: $validated = ($krbreturn == 1);
4150: } else {
4151: $validated = 0;
4152: }
4153: } elsif ($howpwd eq "localauth") {
4154: # Authenticate via installation specific authentcation method:
4155: $validated = &localauth::localauth($user,
4156: $password,
4157: $contentpwd);
4158: } else { # Unrecognized auth is also bad.
4159: $validated = 0;
4160: }
4161: } else {
4162: $validated = 0;
4163: }
4164: #
4165: # $validated has the correct stat of the authentication:
4166: #
4167:
4168: unless ($validated != -3.14159) {
4169: die "ValidateUser - failed to set the value of validated";
4170: }
4171: return $validated;
4172: }
4173:
4174:
4175: sub addline {
4176: my ($fname,$hostid,$ip,$newline)=@_;
4177: my $contents;
4178: my $found=0;
4179: my $expr='^'.$hostid.':'.$ip.':';
4180: $expr =~ s/\./\\\./g;
4181: my $sh;
4182: if ($sh=IO::File->new("$fname.subscription")) {
4183: while (my $subline=<$sh>) {
4184: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
4185: }
4186: $sh->close();
4187: }
4188: $sh=IO::File->new(">$fname.subscription");
4189: if ($contents) { print $sh $contents; }
4190: if ($newline) { print $sh $newline; }
4191: $sh->close();
4192: return $found;
4193: }
4194:
4195: sub getchat {
4196: my ($cdom,$cname,$udom,$uname)=@_;
4197: my %hash;
4198: my $proname=&propath($cdom,$cname);
4199: my @entries=();
4200: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
4201: &GDBM_READER(),0640)) {
4202: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
4203: untie %hash;
4204: }
4205: my @participants=();
4206: my $cutoff=time-60;
4207: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
4208: &GDBM_WRCREAT(),0640)) {
4209: $hash{$uname.':'.$udom}=time;
4210: foreach (sort keys %hash) {
4211: if ($hash{$_}>$cutoff) {
4212: $participants[$#participants+1]='active_participant:'.$_;
4213: }
4214: }
4215: untie %hash;
4216: }
4217: return (@participants,@entries);
4218: }
4219:
4220: sub chatadd {
4221: my ($cdom,$cname,$newchat)=@_;
4222: my %hash;
4223: my $proname=&propath($cdom,$cname);
4224: my @entries=();
4225: my $time=time;
4226: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
4227: &GDBM_WRCREAT(),0640)) {
4228: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
4229: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
4230: my ($thentime,$idnum)=split(/\_/,$lastid);
4231: my $newid=$time.'_000000';
4232: if ($thentime==$time) {
4233: $idnum=~s/^0+//;
4234: $idnum++;
4235: $idnum=substr('000000'.$idnum,-6,6);
4236: $newid=$time.'_'.$idnum;
4237: }
4238: $hash{$newid}=$newchat;
4239: my $expired=$time-3600;
4240: foreach (keys %hash) {
4241: my ($thistime)=($_=~/(\d+)\_/);
4242: if ($thistime<$expired) {
4243: delete $hash{$_};
4244: }
4245: }
4246: untie %hash;
4247: }
4248: {
4249: my $hfh;
4250: if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
4251: print $hfh "$time:".&unescape($newchat)."\n";
4252: }
4253: }
4254: }
4255:
4256: sub unsub {
4257: my ($fname,$clientip)=@_;
4258: my $result;
4259: my $unsubs = 0; # Number of successful unsubscribes:
4260:
4261:
4262: # An old way subscriptions were handled was to have a
4263: # subscription marker file:
4264:
4265: Debug("Attempting unlink of $fname.$clientname");
4266: if (unlink("$fname.$clientname")) {
4267: $unsubs++; # Successful unsub via marker file.
4268: }
4269:
4270: # The more modern way to do it is to have a subscription list
4271: # file:
4272:
4273: if (-e "$fname.subscription") {
4274: my $found=&addline($fname,$clientname,$clientip,'');
4275: if ($found) {
4276: $unsubs++;
4277: }
4278: }
4279:
4280: # If either or both of these mechanisms succeeded in unsubscribing a
4281: # resource we can return ok:
4282:
4283: if($unsubs) {
4284: $result = "ok\n";
4285: } else {
4286: $result = "not_subscribed\n";
4287: }
4288:
4289: return $result;
4290: }
4291:
4292: sub currentversion {
4293: my $fname=shift;
4294: my $version=-1;
4295: my $ulsdir='';
4296: if ($fname=~/^(.+)\/[^\/]+$/) {
4297: $ulsdir=$1;
4298: }
4299: my ($fnamere1,$fnamere2);
4300: # remove version if already specified
4301: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
4302: # get the bits that go before and after the version number
4303: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
4304: $fnamere1=$1;
4305: $fnamere2='.'.$2;
4306: }
4307: if (-e $fname) { $version=1; }
4308: if (-e $ulsdir) {
4309: if(-d $ulsdir) {
4310: if (opendir(LSDIR,$ulsdir)) {
4311: my $ulsfn;
4312: while ($ulsfn=readdir(LSDIR)) {
4313: # see if this is a regular file (ignore links produced earlier)
4314: my $thisfile=$ulsdir.'/'.$ulsfn;
4315: unless (-l $thisfile) {
4316: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
4317: if ($1>$version) { $version=$1; }
4318: }
4319: }
4320: }
4321: closedir(LSDIR);
4322: $version++;
4323: }
4324: }
4325: }
4326: return $version;
4327: }
4328:
4329: sub thisversion {
4330: my $fname=shift;
4331: my $version=-1;
4332: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
4333: $version=$1;
4334: }
4335: return $version;
4336: }
4337:
4338: sub subscribe {
4339: my ($userinput,$clientip)=@_;
4340: my $result;
4341: my ($cmd,$fname)=split(/:/,$userinput);
4342: my $ownership=&ishome($fname);
4343: if ($ownership eq 'owner') {
4344: # explitly asking for the current version?
4345: unless (-e $fname) {
4346: my $currentversion=¤tversion($fname);
4347: if (&thisversion($fname)==$currentversion) {
4348: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
4349: my $root=$1;
4350: my $extension=$2;
4351: symlink($root.'.'.$extension,
4352: $root.'.'.$currentversion.'.'.$extension);
4353: unless ($extension=~/\.meta$/) {
4354: symlink($root.'.'.$extension.'.meta',
4355: $root.'.'.$currentversion.'.'.$extension.'.meta');
4356: }
4357: }
4358: }
4359: }
4360: if (-e $fname) {
4361: if (-d $fname) {
4362: $result="directory\n";
4363: } else {
4364: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
4365: my $now=time;
4366: my $found=&addline($fname,$clientname,$clientip,
4367: "$clientname:$clientip:$now\n");
4368: if ($found) { $result="$fname\n"; }
4369: # if they were subscribed to only meta data, delete that
4370: # subscription, when you subscribe to a file you also get
4371: # the metadata
4372: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
4373: $fname=~s/\/home\/httpd\/html\/res/raw/;
4374: $fname="http://$thisserver/".$fname;
4375: $result="$fname\n";
4376: }
4377: } else {
4378: $result="not_found\n";
4379: }
4380: } else {
4381: $result="rejected\n";
4382: }
4383: return $result;
4384: }
4385:
4386: sub make_passwd_file {
4387: my ($uname, $umode,$npass,$passfilename)=@_;
4388: my $result="ok\n";
4389: if ($umode eq 'krb4' or $umode eq 'krb5') {
4390: {
4391: my $pf = IO::File->new(">$passfilename");
4392: print $pf "$umode:$npass\n";
4393: }
4394: } elsif ($umode eq 'internal') {
4395: my $salt=time;
4396: $salt=substr($salt,6,2);
4397: my $ncpass=crypt($npass,$salt);
4398: {
4399: &Debug("Creating internal auth");
4400: my $pf = IO::File->new(">$passfilename");
4401: print $pf "internal:$ncpass\n";
4402: }
4403: } elsif ($umode eq 'localauth') {
4404: {
4405: my $pf = IO::File->new(">$passfilename");
4406: print $pf "localauth:$npass\n";
4407: }
4408: } elsif ($umode eq 'unix') {
4409: {
4410: #
4411: # Don't allow the creation of privileged accounts!!! that would
4412: # be real bad!!!
4413: #
4414: my $uid = getpwnam($uname);
4415: if((defined $uid) && ($uid == 0)) {
4416: &logthis(">>>Attempted to create privilged account blocked");
4417: return "no_priv_account_error\n";
4418: }
4419:
4420: my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd";
4421:
4422: my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status";
4423: {
4424: &Debug("Executing external: ".$execpath);
4425: &Debug("user = ".$uname.", Password =". $npass);
4426: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
4427: print $se "$uname\n";
4428: print $se "$npass\n";
4429: print $se "$npass\n";
4430: print $se "$lc_error_file\n"; # Status -> unique file.
4431: }
4432: my $error = IO::File->new("< $lc_error_file");
4433: my $useraddok = <$error>;
4434: $error->close;
4435: unlink($lc_error_file);
4436:
4437: chomp $useraddok;
4438:
4439: if($useraddok > 0) {
4440: my $error_text = &lcuseraddstrerror($useraddok);
4441: &logthis("Failed lcuseradd: $error_text");
4442: $result = "lcuseradd_failed:$error_text\n";
4443: } else {
4444: my $pf = IO::File->new(">$passfilename");
4445: print $pf "unix:\n";
4446: }
4447: }
4448: } elsif ($umode eq 'none') {
4449: {
4450: my $pf = IO::File->new("> $passfilename");
4451: print $pf "none:\n";
4452: }
4453: } else {
4454: $result="auth_mode_error\n";
4455: }
4456: return $result;
4457: }
4458:
4459: sub sethost {
4460: my ($remotereq) = @_;
4461: my (undef,$hostid)=split(/:/,$remotereq);
4462: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
4463: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
4464: $currenthostid =$hostid;
4465: $currentdomainid=$hostdom{$hostid};
4466: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
4467: } else {
4468: &logthis("Requested host id $hostid not an alias of ".
4469: $perlvar{'lonHostID'}." refusing connection");
4470: return 'unable_to_set';
4471: }
4472: return 'ok';
4473: }
4474:
4475: sub version {
4476: my ($userinput)=@_;
4477: $remoteVERSION=(split(/:/,$userinput))[1];
4478: return "version:$VERSION";
4479: }
4480:
4481: #There is a copy of this in lonnet.pm
4482: sub userload {
4483: my $numusers=0;
4484: {
4485: opendir(LONIDS,$perlvar{'lonIDsDir'});
4486: my $filename;
4487: my $curtime=time;
4488: while ($filename=readdir(LONIDS)) {
4489: if ($filename eq '.' || $filename eq '..') {next;}
4490: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
4491: if ($curtime-$mtime < 1800) { $numusers++; }
4492: }
4493: closedir(LONIDS);
4494: }
4495: my $userloadpercent=0;
4496: my $maxuserload=$perlvar{'lonUserLoadLim'};
4497: if ($maxuserload) {
4498: $userloadpercent=100*$numusers/$maxuserload;
4499: }
4500: $userloadpercent=sprintf("%.2f",$userloadpercent);
4501: return $userloadpercent;
4502: }
4503:
4504: # Routines for serializing arrays and hashes (copies from lonnet)
4505:
4506: sub array2str {
4507: my (@array) = @_;
4508: my $result=&arrayref2str(\@array);
4509: $result=~s/^__ARRAY_REF__//;
4510: $result=~s/__END_ARRAY_REF__$//;
4511: return $result;
4512: }
4513:
4514: sub arrayref2str {
4515: my ($arrayref) = @_;
4516: my $result='__ARRAY_REF__';
4517: foreach my $elem (@$arrayref) {
4518: if(ref($elem) eq 'ARRAY') {
4519: $result.=&arrayref2str($elem).'&';
4520: } elsif(ref($elem) eq 'HASH') {
4521: $result.=&hashref2str($elem).'&';
4522: } elsif(ref($elem)) {
4523: #print("Got a ref of ".(ref($elem))." skipping.");
4524: } else {
4525: $result.=&escape($elem).'&';
4526: }
4527: }
4528: $result=~s/\&$//;
4529: $result .= '__END_ARRAY_REF__';
4530: return $result;
4531: }
4532:
4533: sub hash2str {
4534: my (%hash) = @_;
4535: my $result=&hashref2str(\%hash);
4536: $result=~s/^__HASH_REF__//;
4537: $result=~s/__END_HASH_REF__$//;
4538: return $result;
4539: }
4540:
4541: sub hashref2str {
4542: my ($hashref)=@_;
4543: my $result='__HASH_REF__';
4544: foreach (sort(keys(%$hashref))) {
4545: if (ref($_) eq 'ARRAY') {
4546: $result.=&arrayref2str($_).'=';
4547: } elsif (ref($_) eq 'HASH') {
4548: $result.=&hashref2str($_).'=';
4549: } elsif (ref($_)) {
4550: $result.='=';
4551: #print("Got a ref of ".(ref($_))." skipping.");
4552: } else {
4553: if ($_) {$result.=&escape($_).'=';} else { last; }
4554: }
4555:
4556: if(ref($hashref->{$_}) eq 'ARRAY') {
4557: $result.=&arrayref2str($hashref->{$_}).'&';
4558: } elsif(ref($hashref->{$_}) eq 'HASH') {
4559: $result.=&hashref2str($hashref->{$_}).'&';
4560: } elsif(ref($hashref->{$_})) {
4561: $result.='&';
4562: #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
4563: } else {
4564: $result.=&escape($hashref->{$_}).'&';
4565: }
4566: }
4567: $result=~s/\&$//;
4568: $result .= '__END_HASH_REF__';
4569: return $result;
4570: }
4571:
4572: # ----------------------------------- POD (plain old documentation, CPAN style)
4573:
4574: =head1 NAME
4575:
4576: lond - "LON Daemon" Server (port "LOND" 5663)
4577:
4578: =head1 SYNOPSIS
4579:
4580: Usage: B<lond>
4581:
4582: Should only be run as user=www. This is a command-line script which
4583: is invoked by B<loncron>. There is no expectation that a typical user
4584: will manually start B<lond> from the command-line. (In other words,
4585: DO NOT START B<lond> YOURSELF.)
4586:
4587: =head1 DESCRIPTION
4588:
4589: There are two characteristics associated with the running of B<lond>,
4590: PROCESS MANAGEMENT (starting, stopping, handling child processes)
4591: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
4592: subscriptions, etc). These are described in two large
4593: sections below.
4594:
4595: B<PROCESS MANAGEMENT>
4596:
4597: Preforker - server who forks first. Runs as a daemon. HUPs.
4598: Uses IDEA encryption
4599:
4600: B<lond> forks off children processes that correspond to the other servers
4601: in the network. Management of these processes can be done at the
4602: parent process level or the child process level.
4603:
4604: B<logs/lond.log> is the location of log messages.
4605:
4606: The process management is now explained in terms of linux shell commands,
4607: subroutines internal to this code, and signal assignments:
4608:
4609: =over 4
4610:
4611: =item *
4612:
4613: PID is stored in B<logs/lond.pid>
4614:
4615: This is the process id number of the parent B<lond> process.
4616:
4617: =item *
4618:
4619: SIGTERM and SIGINT
4620:
4621: Parent signal assignment:
4622: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
4623:
4624: Child signal assignment:
4625: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
4626: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
4627: to restart a new child.)
4628:
4629: Command-line invocations:
4630: B<kill> B<-s> SIGTERM I<PID>
4631: B<kill> B<-s> SIGINT I<PID>
4632:
4633: Subroutine B<HUNTSMAN>:
4634: This is only invoked for the B<lond> parent I<PID>.
4635: This kills all the children, and then the parent.
4636: The B<lonc.pid> file is cleared.
4637:
4638: =item *
4639:
4640: SIGHUP
4641:
4642: Current bug:
4643: This signal can only be processed the first time
4644: on the parent process. Subsequent SIGHUP signals
4645: have no effect.
4646:
4647: Parent signal assignment:
4648: $SIG{HUP} = \&HUPSMAN;
4649:
4650: Child signal assignment:
4651: none (nothing happens)
4652:
4653: Command-line invocations:
4654: B<kill> B<-s> SIGHUP I<PID>
4655:
4656: Subroutine B<HUPSMAN>:
4657: This is only invoked for the B<lond> parent I<PID>,
4658: This kills all the children, and then the parent.
4659: The B<lond.pid> file is cleared.
4660:
4661: =item *
4662:
4663: SIGUSR1
4664:
4665: Parent signal assignment:
4666: $SIG{USR1} = \&USRMAN;
4667:
4668: Child signal assignment:
4669: $SIG{USR1}= \&logstatus;
4670:
4671: Command-line invocations:
4672: B<kill> B<-s> SIGUSR1 I<PID>
4673:
4674: Subroutine B<USRMAN>:
4675: When invoked for the B<lond> parent I<PID>,
4676: SIGUSR1 is sent to all the children, and the status of
4677: each connection is logged.
4678:
4679: =item *
4680:
4681: SIGUSR2
4682:
4683: Parent Signal assignment:
4684: $SIG{USR2} = \&UpdateHosts
4685:
4686: Child signal assignment:
4687: NONE
4688:
4689:
4690: =item *
4691:
4692: SIGCHLD
4693:
4694: Parent signal assignment:
4695: $SIG{CHLD} = \&REAPER;
4696:
4697: Child signal assignment:
4698: none
4699:
4700: Command-line invocations:
4701: B<kill> B<-s> SIGCHLD I<PID>
4702:
4703: Subroutine B<REAPER>:
4704: This is only invoked for the B<lond> parent I<PID>.
4705: Information pertaining to the child is removed.
4706: The socket port is cleaned up.
4707:
4708: =back
4709:
4710: B<SERVER-SIDE ACTIVITIES>
4711:
4712: Server-side information can be accepted in an encrypted or non-encrypted
4713: method.
4714:
4715: =over 4
4716:
4717: =item ping
4718:
4719: Query a client in the hosts.tab table; "Are you there?"
4720:
4721: =item pong
4722:
4723: Respond to a ping query.
4724:
4725: =item ekey
4726:
4727: Read in encrypted key, make cipher. Respond with a buildkey.
4728:
4729: =item load
4730:
4731: Respond with CPU load based on a computation upon /proc/loadavg.
4732:
4733: =item currentauth
4734:
4735: Reply with current authentication information (only over an
4736: encrypted channel).
4737:
4738: =item auth
4739:
4740: Only over an encrypted channel, reply as to whether a user's
4741: authentication information can be validated.
4742:
4743: =item passwd
4744:
4745: Allow for a password to be set.
4746:
4747: =item makeuser
4748:
4749: Make a user.
4750:
4751: =item passwd
4752:
4753: Allow for authentication mechanism and password to be changed.
4754:
4755: =item home
4756:
4757: Respond to a question "are you the home for a given user?"
4758:
4759: =item update
4760:
4761: Update contents of a subscribed resource.
4762:
4763: =item unsubscribe
4764:
4765: The server is unsubscribing from a resource.
4766:
4767: =item subscribe
4768:
4769: The server is subscribing to a resource.
4770:
4771: =item log
4772:
4773: Place in B<logs/lond.log>
4774:
4775: =item put
4776:
4777: stores hash in namespace
4778:
4779: =item rolesput
4780:
4781: put a role into a user's environment
4782:
4783: =item get
4784:
4785: returns hash with keys from array
4786: reference filled in from namespace
4787:
4788: =item eget
4789:
4790: returns hash with keys from array
4791: reference filled in from namesp (encrypts the return communication)
4792:
4793: =item rolesget
4794:
4795: get a role from a user's environment
4796:
4797: =item del
4798:
4799: deletes keys out of array from namespace
4800:
4801: =item keys
4802:
4803: returns namespace keys
4804:
4805: =item dump
4806:
4807: dumps the complete (or key matching regexp) namespace into a hash
4808:
4809: =item store
4810:
4811: stores hash permanently
4812: for this url; hashref needs to be given and should be a \%hashname; the
4813: remaining args aren't required and if they aren't passed or are '' they will
4814: be derived from the ENV
4815:
4816: =item restore
4817:
4818: returns a hash for a given url
4819:
4820: =item querysend
4821:
4822: Tells client about the lonsql process that has been launched in response
4823: to a sent query.
4824:
4825: =item queryreply
4826:
4827: Accept information from lonsql and make appropriate storage in temporary
4828: file space.
4829:
4830: =item idput
4831:
4832: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
4833: for each student, defined perhaps by the institutional Registrar.)
4834:
4835: =item idget
4836:
4837: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
4838: for each student, defined perhaps by the institutional Registrar.)
4839:
4840: =item tmpput
4841:
4842: Accept and store information in temporary space.
4843:
4844: =item tmpget
4845:
4846: Send along temporarily stored information.
4847:
4848: =item ls
4849:
4850: List part of a user's directory.
4851:
4852: =item pushtable
4853:
4854: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
4855: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
4856: must be restored manually in case of a problem with the new table file.
4857: pushtable requires that the request be encrypted and validated via
4858: ValidateManager. The form of the command is:
4859: enc:pushtable tablename <tablecontents> \n
4860: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
4861: cleartext newline.
4862:
4863: =item Hanging up (exit or init)
4864:
4865: What to do when a client tells the server that they (the client)
4866: are leaving the network.
4867:
4868: =item unknown command
4869:
4870: If B<lond> is sent an unknown command (not in the list above),
4871: it replys to the client "unknown_cmd".
4872:
4873:
4874: =item UNKNOWN CLIENT
4875:
4876: If the anti-spoofing algorithm cannot verify the client,
4877: the client is rejected (with a "refused" message sent
4878: to the client, and the connection is closed.
4879:
4880: =back
4881:
4882: =head1 PREREQUISITES
4883:
4884: IO::Socket
4885: IO::File
4886: Apache::File
4887: Symbol
4888: POSIX
4889: Crypt::IDEA
4890: LWP::UserAgent()
4891: GDBM_File
4892: Authen::Krb4
4893: Authen::Krb5
4894:
4895: =head1 COREQUISITES
4896:
4897: =head1 OSNAMES
4898:
4899: linux
4900:
4901: =head1 SCRIPT CATEGORIES
4902:
4903: Server/Process
4904:
4905: =cut
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