1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.228 2004/08/10 22:55:31 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: 1.228 $'; #' 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: if ($ufile =~m|/\.\./|) {
1816: # any files paths with /../ in them refuse
1817: # to deal with
1818: &Failure($client, "refused\n", "$cmd:$tail");
1819: } else {
1820: my $udir = &propath($udom,$uname);
1821: if (-e $udir) {
1822: my $file=$udir.'/userfiles/'.$ufile;
1823: if (-e $file) {
1824: unlink($file);
1825: if (-e $file) {
1826: &Failure($client, "failed\n", "$cmd:$tail");
1827: } else {
1828: &Reply($client, "ok\n", "$cmd:$tail");
1829: }
1830: } else {
1831: &Failure($client, "not_found\n", "$cmd:$tail");
1832: }
1833: } else {
1834: &Failure($client, "not_home\n", "$cmd:$tail");
1835: }
1836: }
1837: return 1;
1838: }
1839: ®ister_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
1840:
1841:
1842: #
1843: # Authenticate access to a user file by checking the user's
1844: # session token(?)
1845: #
1846: # Parameters:
1847: # cmd - The request keyword that dispatched to tus.
1848: # tail - The tail of the request (colon separated parameters).
1849: # client - Filehandle open on the client.
1850: # Return:
1851: # 1.
1852:
1853: sub token_auth_user_file_handler {
1854: my ($cmd, $tail, $client) = @_;
1855:
1856: my ($fname, $session) = split(/:/, $tail);
1857:
1858: chomp($session);
1859: my $reply='non_auth';
1860: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
1861: $session.'.id')) {
1862: while (my $line=<ENVIN>) {
1863: if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
1864: }
1865: close(ENVIN);
1866: &Reply($client, $reply);
1867: } else {
1868: &Failure($client, "invalid_token\n", "$cmd:$tail");
1869: }
1870: return 1;
1871:
1872: }
1873:
1874: ®ister_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
1875: #---------------------------------------------------------------
1876: #
1877: # Getting, decoding and dispatching requests:
1878: #
1879:
1880: #
1881: # Get a Request:
1882: # Gets a Request message from the client. The transaction
1883: # is defined as a 'line' of text. We remove the new line
1884: # from the text line.
1885: #
1886: sub get_request {
1887: my $input = <$client>;
1888: chomp($input);
1889:
1890: Debug("get_request: Request = $input\n");
1891:
1892: &status('Processing '.$clientname.':'.$input);
1893:
1894: return $input;
1895: }
1896: #---------------------------------------------------------------
1897: #
1898: # Process a request. This sub should shrink as each action
1899: # gets farmed out into a separat sub that is registered
1900: # with the dispatch hash.
1901: #
1902: # Parameters:
1903: # user_input - The request received from the client (lonc).
1904: # Returns:
1905: # true to keep processing, false if caller should exit.
1906: #
1907: sub process_request {
1908: my ($userinput) = @_; # Easier for now to break style than to
1909: # fix all the userinput -> user_input.
1910: my $wasenc = 0; # True if request was encrypted.
1911: # ------------------------------------------------------------ See if encrypted
1912: if ($userinput =~ /^enc/) {
1913: $userinput = decipher($userinput);
1914: $wasenc=1;
1915: if(!$userinput) { # Cipher not defined.
1916: &Failure($client, "error: Encrypted data without negotated key");
1917: return 0;
1918: }
1919: }
1920: Debug("process_request: $userinput\n");
1921:
1922: #
1923: # The 'correct way' to add a command to lond is now to
1924: # write a sub to execute it and Add it to the command dispatch
1925: # hash via a call to register_handler.. The comments to that
1926: # sub should give you enough to go on to show how to do this
1927: # along with the examples that are building up as this code
1928: # is getting refactored. Until all branches of the
1929: # if/elseif monster below have been factored out into
1930: # separate procesor subs, if the dispatch hash is missing
1931: # the command keyword, we will fall through to the remainder
1932: # of the if/else chain below in order to keep this thing in
1933: # working order throughout the transmogrification.
1934:
1935: my ($command, $tail) = split(/:/, $userinput, 2);
1936: chomp($command);
1937: chomp($tail);
1938: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
1939: $command =~ s/(\r)//; # And this too for parameterless commands.
1940: if(!$tail) {
1941: $tail =""; # defined but blank.
1942: }
1943:
1944: &Debug("Command received: $command, encoded = $wasenc");
1945:
1946: if(defined $Dispatcher{$command}) {
1947:
1948: my $dispatch_info = $Dispatcher{$command};
1949: my $handler = $$dispatch_info[0];
1950: my $need_encode = $$dispatch_info[1];
1951: my $client_types = $$dispatch_info[2];
1952: Debug("Matched dispatch hash: mustencode: $need_encode "
1953: ."ClientType $client_types");
1954:
1955: # Validate the request:
1956:
1957: my $ok = 1;
1958: my $requesterprivs = 0;
1959: if(&isClient()) {
1960: $requesterprivs |= $CLIENT_OK;
1961: }
1962: if(&isManager()) {
1963: $requesterprivs |= $MANAGER_OK;
1964: }
1965: if($need_encode && (!$wasenc)) {
1966: Debug("Must encode but wasn't: $need_encode $wasenc");
1967: $ok = 0;
1968: }
1969: if(($client_types & $requesterprivs) == 0) {
1970: Debug("Client not privileged to do this operation");
1971: $ok = 0;
1972: }
1973:
1974: if($ok) {
1975: Debug("Dispatching to handler $command $tail");
1976: my $keep_going = &$handler($command, $tail, $client);
1977: return $keep_going;
1978: } else {
1979: Debug("Refusing to dispatch because client did not match requirements");
1980: Failure($client, "refused\n", $userinput);
1981: return 1;
1982: }
1983:
1984: }
1985:
1986: #------------------- Commands not yet in spearate handlers. --------------
1987:
1988:
1989:
1990: # ----------------------------------------------------------------- unsubscribe
1991: if ($userinput =~ /^unsub/) {
1992: if(isClient) {
1993: my ($cmd,$fname)=split(/:/,$userinput);
1994: if (-e $fname) {
1995: print $client &unsub($fname,$clientip);
1996: } else {
1997: print $client "not_found\n";
1998: }
1999: } else {
2000: Reply($client, "refused\n", $userinput);
2001:
2002: }
2003: # ------------------------------------------------------------------- subscribe
2004: } elsif ($userinput =~ /^sub/) {
2005: if(isClient) {
2006: print $client &subscribe($userinput,$clientip);
2007: } else {
2008: Reply($client, "refused\n", $userinput);
2009:
2010: }
2011: # ------------------------------------------------------------- current version
2012: } elsif ($userinput =~ /^currentversion/) {
2013: if(isClient) {
2014: my ($cmd,$fname)=split(/:/,$userinput);
2015: print $client ¤tversion($fname)."\n";
2016: } else {
2017: Reply($client, "refused\n", $userinput);
2018:
2019: }
2020: # ------------------------------------------------------------------------- log
2021: } elsif ($userinput =~ /^log/) {
2022: if(isClient) {
2023: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
2024: chomp($what);
2025: my $proname=propath($udom,$uname);
2026: my $now=time;
2027: {
2028: my $hfh;
2029: if ($hfh=IO::File->new(">>$proname/activity.log")) {
2030: print $hfh "$now:$clientname:$what\n";
2031: print $client "ok\n";
2032: } else {
2033: print $client "error: ".($!+0)
2034: ." IO::File->new Failed "
2035: ."while attempting log\n";
2036: }
2037: }
2038: } else {
2039: Reply($client, "refused\n", $userinput);
2040:
2041: }
2042: # ------------------------------------------------------------------------- put
2043: } elsif ($userinput =~ /^put/) {
2044: if(isClient) {
2045: my ($cmd,$udom,$uname,$namespace,$what)
2046: =split(/:/,$userinput,5);
2047: $namespace=~s/\//\_/g;
2048: $namespace=~s/\W//g;
2049: if ($namespace ne 'roles') {
2050: chomp($what);
2051: my $proname=propath($udom,$uname);
2052: my $now=time;
2053: my @pairs=split(/\&/,$what);
2054: my %hash;
2055: if (tie(%hash,'GDBM_File',
2056: "$proname/$namespace.db",
2057: &GDBM_WRCREAT(),0640)) {
2058: unless ($namespace=~/^nohist\_/) {
2059: my $hfh;
2060: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }
2061: }
2062:
2063: foreach my $pair (@pairs) {
2064: my ($key,$value)=split(/=/,$pair);
2065: $hash{$key}=$value;
2066: }
2067: if (untie(%hash)) {
2068: print $client "ok\n";
2069: } else {
2070: print $client "error: ".($!+0)
2071: ." untie(GDBM) failed ".
2072: "while attempting put\n";
2073: }
2074: } else {
2075: print $client "error: ".($!)
2076: ." tie(GDBM) Failed ".
2077: "while attempting put\n";
2078: }
2079: } else {
2080: print $client "refused\n";
2081: }
2082: } else {
2083: Reply($client, "refused\n", $userinput);
2084:
2085: }
2086: # ------------------------------------------------------------------- inc
2087: } elsif ($userinput =~ /^inc:/) {
2088: if(isClient) {
2089: my ($cmd,$udom,$uname,$namespace,$what)
2090: =split(/:/,$userinput);
2091: $namespace=~s/\//\_/g;
2092: $namespace=~s/\W//g;
2093: if ($namespace ne 'roles') {
2094: chomp($what);
2095: my $proname=propath($udom,$uname);
2096: my $now=time;
2097: my @pairs=split(/\&/,$what);
2098: my %hash;
2099: if (tie(%hash,'GDBM_File',
2100: "$proname/$namespace.db",
2101: &GDBM_WRCREAT(),0640)) {
2102: unless ($namespace=~/^nohist\_/) {
2103: my $hfh;
2104: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }
2105: }
2106: foreach my $pair (@pairs) {
2107: my ($key,$value)=split(/=/,$pair);
2108: # We could check that we have a number...
2109: if (! defined($value) || $value eq '') {
2110: $value = 1;
2111: }
2112: $hash{$key}+=$value;
2113: }
2114: if (untie(%hash)) {
2115: print $client "ok\n";
2116: } else {
2117: print $client "error: ".($!+0)
2118: ." untie(GDBM) failed ".
2119: "while attempting inc\n";
2120: }
2121: } else {
2122: print $client "error: ".($!)
2123: ." tie(GDBM) Failed ".
2124: "while attempting inc\n";
2125: }
2126: } else {
2127: print $client "refused\n";
2128: }
2129: } else {
2130: Reply($client, "refused\n", $userinput);
2131:
2132: }
2133: # -------------------------------------------------------------------- rolesput
2134: } elsif ($userinput =~ /^rolesput/) {
2135: if(isClient) {
2136: &Debug("rolesput");
2137: if ($wasenc==1) {
2138: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
2139: =split(/:/,$userinput);
2140: &Debug("cmd = ".$cmd." exedom= ".$exedom.
2141: "user = ".$exeuser." udom=".$udom.
2142: "what = ".$what);
2143: my $namespace='roles';
2144: chomp($what);
2145: my $proname=propath($udom,$uname);
2146: my $now=time;
2147: my @pairs=split(/\&/,$what);
2148: my %hash;
2149: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2150: {
2151: my $hfh;
2152: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
2153: print $hfh "P:$now:$exedom:$exeuser:$what\n";
2154: }
2155: }
2156:
2157: foreach my $pair (@pairs) {
2158: my ($key,$value)=split(/=/,$pair);
2159: &ManagePermissions($key, $udom, $uname,
2160: &get_auth_type( $udom,
2161: $uname));
2162: $hash{$key}=$value;
2163: }
2164: if (untie(%hash)) {
2165: print $client "ok\n";
2166: } else {
2167: print $client "error: ".($!+0)
2168: ." untie(GDBM) Failed ".
2169: "while attempting rolesput\n";
2170: }
2171: } else {
2172: print $client "error: ".($!+0)
2173: ." tie(GDBM) Failed ".
2174: "while attempting rolesput\n";
2175: }
2176: } else {
2177: print $client "refused\n";
2178: }
2179: } else {
2180: Reply($client, "refused\n", $userinput);
2181:
2182: }
2183: # -------------------------------------------------------------------- rolesdel
2184: } elsif ($userinput =~ /^rolesdel/) {
2185: if(isClient) {
2186: &Debug("rolesdel");
2187: if ($wasenc==1) {
2188: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
2189: =split(/:/,$userinput);
2190: &Debug("cmd = ".$cmd." exedom= ".$exedom.
2191: "user = ".$exeuser." udom=".$udom.
2192: "what = ".$what);
2193: my $namespace='roles';
2194: chomp($what);
2195: my $proname=propath($udom,$uname);
2196: my $now=time;
2197: my @rolekeys=split(/\&/,$what);
2198: my %hash;
2199: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2200: {
2201: my $hfh;
2202: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
2203: print $hfh "D:$now:$exedom:$exeuser:$what\n";
2204: }
2205: }
2206: foreach my $key (@rolekeys) {
2207: delete $hash{$key};
2208: }
2209: if (untie(%hash)) {
2210: print $client "ok\n";
2211: } else {
2212: print $client "error: ".($!+0)
2213: ." untie(GDBM) Failed ".
2214: "while attempting rolesdel\n";
2215: }
2216: } else {
2217: print $client "error: ".($!+0)
2218: ." tie(GDBM) Failed ".
2219: "while attempting rolesdel\n";
2220: }
2221: } else {
2222: print $client "refused\n";
2223: }
2224: } else {
2225: Reply($client, "refused\n", $userinput);
2226:
2227: }
2228: # ------------------------------------------------------------------------- get
2229: } elsif ($userinput =~ /^get/) {
2230: if(isClient) {
2231: my ($cmd,$udom,$uname,$namespace,$what)
2232: =split(/:/,$userinput);
2233: $namespace=~s/\//\_/g;
2234: $namespace=~s/\W//g;
2235: chomp($what);
2236: my @queries=split(/\&/,$what);
2237: my $proname=propath($udom,$uname);
2238: my $qresult='';
2239: my %hash;
2240: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2241: for (my $i=0;$i<=$#queries;$i++) {
2242: $qresult.="$hash{$queries[$i]}&";
2243: }
2244: if (untie(%hash)) {
2245: $qresult=~s/\&$//;
2246: print $client "$qresult\n";
2247: } else {
2248: print $client "error: ".($!+0)
2249: ." untie(GDBM) Failed ".
2250: "while attempting get\n";
2251: }
2252: } else {
2253: if ($!+0 == 2) {
2254: print $client "error:No such file or ".
2255: "GDBM reported bad block error\n";
2256: } else {
2257: print $client "error: ".($!+0)
2258: ." tie(GDBM) Failed ".
2259: "while attempting get\n";
2260: }
2261: }
2262: } else {
2263: Reply($client, "refused\n", $userinput);
2264:
2265: }
2266: # ------------------------------------------------------------------------ eget
2267: } elsif ($userinput =~ /^eget/) {
2268: if (isClient) {
2269: my ($cmd,$udom,$uname,$namespace,$what)
2270: =split(/:/,$userinput);
2271: $namespace=~s/\//\_/g;
2272: $namespace=~s/\W//g;
2273: chomp($what);
2274: my @queries=split(/\&/,$what);
2275: my $proname=propath($udom,$uname);
2276: my $qresult='';
2277: my %hash;
2278: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2279: for (my $i=0;$i<=$#queries;$i++) {
2280: $qresult.="$hash{$queries[$i]}&";
2281: }
2282: if (untie(%hash)) {
2283: $qresult=~s/\&$//;
2284: if ($cipher) {
2285: my $cmdlength=length($qresult);
2286: $qresult.=" ";
2287: my $encqresult='';
2288: for
2289: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
2290: $encqresult.=
2291: unpack("H16",
2292: $cipher->encrypt(substr($qresult,$encidx,8)));
2293: }
2294: print $client "enc:$cmdlength:$encqresult\n";
2295: } else {
2296: print $client "error:no_key\n";
2297: }
2298: } else {
2299: print $client "error: ".($!+0)
2300: ." untie(GDBM) Failed ".
2301: "while attempting eget\n";
2302: }
2303: } else {
2304: print $client "error: ".($!+0)
2305: ." tie(GDBM) Failed ".
2306: "while attempting eget\n";
2307: }
2308: } else {
2309: Reply($client, "refused\n", $userinput);
2310:
2311: }
2312: # ------------------------------------------------------------------------- del
2313: } elsif ($userinput =~ /^del/) {
2314: if(isClient) {
2315: my ($cmd,$udom,$uname,$namespace,$what)
2316: =split(/:/,$userinput);
2317: $namespace=~s/\//\_/g;
2318: $namespace=~s/\W//g;
2319: chomp($what);
2320: my $proname=propath($udom,$uname);
2321: my $now=time;
2322: my @keys=split(/\&/,$what);
2323: my %hash;
2324: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2325: unless ($namespace=~/^nohist\_/) {
2326: my $hfh;
2327: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "D:$now:$what\n"; }
2328: }
2329: foreach my $key (@keys) {
2330: delete($hash{$key});
2331: }
2332: if (untie(%hash)) {
2333: print $client "ok\n";
2334: } else {
2335: print $client "error: ".($!+0)
2336: ." untie(GDBM) Failed ".
2337: "while attempting del\n";
2338: }
2339: } else {
2340: print $client "error: ".($!+0)
2341: ." tie(GDBM) Failed ".
2342: "while attempting del\n";
2343: }
2344: } else {
2345: Reply($client, "refused\n", $userinput);
2346:
2347: }
2348: # ------------------------------------------------------------------------ keys
2349: } elsif ($userinput =~ /^keys/) {
2350: if(isClient) {
2351: my ($cmd,$udom,$uname,$namespace)
2352: =split(/:/,$userinput);
2353: $namespace=~s/\//\_/g;
2354: $namespace=~s/\W//g;
2355: my $proname=propath($udom,$uname);
2356: my $qresult='';
2357: my %hash;
2358: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2359: foreach my $key (keys %hash) {
2360: $qresult.="$key&";
2361: }
2362: if (untie(%hash)) {
2363: $qresult=~s/\&$//;
2364: print $client "$qresult\n";
2365: } else {
2366: print $client "error: ".($!+0)
2367: ." untie(GDBM) Failed ".
2368: "while attempting keys\n";
2369: }
2370: } else {
2371: print $client "error: ".($!+0)
2372: ." tie(GDBM) Failed ".
2373: "while attempting keys\n";
2374: }
2375: } else {
2376: Reply($client, "refused\n", $userinput);
2377:
2378: }
2379: # ----------------------------------------------------------------- dumpcurrent
2380: } elsif ($userinput =~ /^currentdump/) {
2381: if (isClient) {
2382: my ($cmd,$udom,$uname,$namespace)
2383: =split(/:/,$userinput);
2384: $namespace=~s/\//\_/g;
2385: $namespace=~s/\W//g;
2386: my $qresult='';
2387: my $proname=propath($udom,$uname);
2388: my %hash;
2389: if (tie(%hash,'GDBM_File',
2390: "$proname/$namespace.db",
2391: &GDBM_READER(),0640)) {
2392: # Structure of %data:
2393: # $data{$symb}->{$parameter}=$value;
2394: # $data{$symb}->{'v.'.$parameter}=$version;
2395: # since $parameter will be unescaped, we do not
2396: # have to worry about silly parameter names...
2397: my %data = ();
2398: while (my ($key,$value) = each(%hash)) {
2399: my ($v,$symb,$param) = split(/:/,$key);
2400: next if ($v eq 'version' || $symb eq 'keys');
2401: next if (exists($data{$symb}) &&
2402: exists($data{$symb}->{$param}) &&
2403: $data{$symb}->{'v.'.$param} > $v);
2404: $data{$symb}->{$param}=$value;
2405: $data{$symb}->{'v.'.$param}=$v;
2406: }
2407: if (untie(%hash)) {
2408: while (my ($symb,$param_hash) = each(%data)) {
2409: while(my ($param,$value) = each (%$param_hash)){
2410: next if ($param =~ /^v\./);
2411: $qresult.=$symb.':'.$param.'='.$value.'&';
2412: }
2413: }
2414: chop($qresult);
2415: print $client "$qresult\n";
2416: } else {
2417: print $client "error: ".($!+0)
2418: ." untie(GDBM) Failed ".
2419: "while attempting currentdump\n";
2420: }
2421: } else {
2422: print $client "error: ".($!+0)
2423: ." tie(GDBM) Failed ".
2424: "while attempting currentdump\n";
2425: }
2426: } else {
2427: Reply($client, "refused\n", $userinput);
2428: }
2429: # ------------------------------------------------------------------------ dump
2430: } elsif ($userinput =~ /^dump/) {
2431: if(isClient) {
2432: my ($cmd,$udom,$uname,$namespace,$regexp)
2433: =split(/:/,$userinput);
2434: $namespace=~s/\//\_/g;
2435: $namespace=~s/\W//g;
2436: if (defined($regexp)) {
2437: $regexp=&unescape($regexp);
2438: } else {
2439: $regexp='.';
2440: }
2441: my $qresult='';
2442: my $proname=propath($udom,$uname);
2443: my %hash;
2444: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2445: while (my ($key,$value) = each(%hash)) {
2446: if ($regexp eq '.') {
2447: $qresult.=$key.'='.$value.'&';
2448: } else {
2449: my $unescapeKey = &unescape($key);
2450: if (eval('$unescapeKey=~/$regexp/')) {
2451: $qresult.="$key=$value&";
2452: }
2453: }
2454: }
2455: if (untie(%hash)) {
2456: chop($qresult);
2457: print $client "$qresult\n";
2458: } else {
2459: print $client "error: ".($!+0)
2460: ." untie(GDBM) Failed ".
2461: "while attempting dump\n";
2462: }
2463: } else {
2464: print $client "error: ".($!+0)
2465: ." tie(GDBM) Failed ".
2466: "while attempting dump\n";
2467: }
2468: } else {
2469: Reply($client, "refused\n", $userinput);
2470:
2471: }
2472: # ----------------------------------------------------------------------- store
2473: } elsif ($userinput =~ /^store/) {
2474: if(isClient) {
2475: my ($cmd,$udom,$uname,$namespace,$rid,$what)
2476: =split(/:/,$userinput);
2477: $namespace=~s/\//\_/g;
2478: $namespace=~s/\W//g;
2479: if ($namespace ne 'roles') {
2480: chomp($what);
2481: my $proname=propath($udom,$uname);
2482: my $now=time;
2483: my @pairs=split(/\&/,$what);
2484: my %hash;
2485: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2486: unless ($namespace=~/^nohist\_/) {
2487: my $hfh;
2488: if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
2489: print $hfh "P:$now:$rid:$what\n";
2490: }
2491: }
2492: my @previouskeys=split(/&/,$hash{"keys:$rid"});
2493: my $key;
2494: $hash{"version:$rid"}++;
2495: my $version=$hash{"version:$rid"};
2496: my $allkeys='';
2497: foreach my $pair (@pairs) {
2498: my ($key,$value)=split(/=/,$pair);
2499: $allkeys.=$key.':';
2500: $hash{"$version:$rid:$key"}=$value;
2501: }
2502: $hash{"$version:$rid:timestamp"}=$now;
2503: $allkeys.='timestamp';
2504: $hash{"$version:keys:$rid"}=$allkeys;
2505: if (untie(%hash)) {
2506: print $client "ok\n";
2507: } else {
2508: print $client "error: ".($!+0)
2509: ." untie(GDBM) Failed ".
2510: "while attempting store\n";
2511: }
2512: } else {
2513: print $client "error: ".($!+0)
2514: ." tie(GDBM) Failed ".
2515: "while attempting store\n";
2516: }
2517: } else {
2518: print $client "refused\n";
2519: }
2520: } else {
2521: Reply($client, "refused\n", $userinput);
2522:
2523: }
2524: # --------------------------------------------------------------------- restore
2525: } elsif ($userinput =~ /^restore/) {
2526: if(isClient) {
2527: my ($cmd,$udom,$uname,$namespace,$rid)
2528: =split(/:/,$userinput);
2529: $namespace=~s/\//\_/g;
2530: $namespace=~s/\W//g;
2531: chomp($rid);
2532: my $proname=propath($udom,$uname);
2533: my $qresult='';
2534: my %hash;
2535: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2536: my $version=$hash{"version:$rid"};
2537: $qresult.="version=$version&";
2538: my $scope;
2539: for ($scope=1;$scope<=$version;$scope++) {
2540: my $vkeys=$hash{"$scope:keys:$rid"};
2541: my @keys=split(/:/,$vkeys);
2542: my $key;
2543: $qresult.="$scope:keys=$vkeys&";
2544: foreach $key (@keys) {
2545: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
2546: }
2547: }
2548: if (untie(%hash)) {
2549: $qresult=~s/\&$//;
2550: print $client "$qresult\n";
2551: } else {
2552: print $client "error: ".($!+0)
2553: ." untie(GDBM) Failed ".
2554: "while attempting restore\n";
2555: }
2556: } else {
2557: print $client "error: ".($!+0)
2558: ." tie(GDBM) Failed ".
2559: "while attempting restore\n";
2560: }
2561: } else {
2562: Reply($client, "refused\n", $userinput);
2563:
2564: }
2565: # -------------------------------------------------------------------- chatsend
2566: } elsif ($userinput =~ /^chatsend/) {
2567: if(isClient) {
2568: my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
2569: &chatadd($cdom,$cnum,$newpost);
2570: print $client "ok\n";
2571: } else {
2572: Reply($client, "refused\n", $userinput);
2573:
2574: }
2575: # -------------------------------------------------------------------- chatretr
2576: } elsif ($userinput =~ /^chatretr/) {
2577: if(isClient) {
2578: my
2579: ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
2580: my $reply='';
2581: foreach (&getchat($cdom,$cnum,$udom,$uname)) {
2582: $reply.=&escape($_).':';
2583: }
2584: $reply=~s/\:$//;
2585: print $client $reply."\n";
2586: } else {
2587: Reply($client, "refused\n", $userinput);
2588:
2589: }
2590: # ------------------------------------------------------------------- querysend
2591: } elsif ($userinput =~ /^querysend/) {
2592: if (isClient) {
2593: my ($cmd,$query,
2594: $arg1,$arg2,$arg3)=split(/\:/,$userinput);
2595: $query=~s/\n*$//g;
2596: print $client "".
2597: sqlreply("$clientname\&$query".
2598: "\&$arg1"."\&$arg2"."\&$arg3")."\n";
2599: } else {
2600: Reply($client, "refused\n", $userinput);
2601:
2602: }
2603: # ------------------------------------------------------------------ queryreply
2604: } elsif ($userinput =~ /^queryreply/) {
2605: if(isClient) {
2606: my ($cmd,$id,$reply)=split(/:/,$userinput);
2607: my $store;
2608: my $execdir=$perlvar{'lonDaemons'};
2609: if ($store=IO::File->new(">$execdir/tmp/$id")) {
2610: $reply=~s/\&/\n/g;
2611: print $store $reply;
2612: close $store;
2613: my $store2=IO::File->new(">$execdir/tmp/$id.end");
2614: print $store2 "done\n";
2615: close $store2;
2616: print $client "ok\n";
2617: } else {
2618: print $client "error: ".($!+0)
2619: ." IO::File->new Failed ".
2620: "while attempting queryreply\n";
2621: }
2622: } else {
2623: Reply($client, "refused\n", $userinput);
2624:
2625: }
2626: # ----------------------------------------------------------------- courseidput
2627: } elsif ($userinput =~ /^courseidput/) {
2628: if(isClient) {
2629: my ($cmd,$udom,$what)=split(/:/,$userinput);
2630: chomp($what);
2631: $udom=~s/\W//g;
2632: my $proname=
2633: "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
2634: my $now=time;
2635: my @pairs=split(/\&/,$what);
2636: my %hash;
2637: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
2638: foreach my $pair (@pairs) {
2639: my ($key,$descr,$inst_code)=split(/=/,$pair);
2640: $hash{$key}=$descr.':'.$inst_code.':'.$now;
2641: }
2642: if (untie(%hash)) {
2643: print $client "ok\n";
2644: } else {
2645: print $client "error: ".($!+0)
2646: ." untie(GDBM) Failed ".
2647: "while attempting courseidput\n";
2648: }
2649: } else {
2650: print $client "error: ".($!+0)
2651: ." tie(GDBM) Failed ".
2652: "while attempting courseidput\n";
2653: }
2654: } else {
2655: Reply($client, "refused\n", $userinput);
2656:
2657: }
2658: # ---------------------------------------------------------------- courseiddump
2659: } elsif ($userinput =~ /^courseiddump/) {
2660: if(isClient) {
2661: my ($cmd,$udom,$since,$description)
2662: =split(/:/,$userinput);
2663: if (defined($description)) {
2664: $description=&unescape($description);
2665: } else {
2666: $description='.';
2667: }
2668: unless (defined($since)) { $since=0; }
2669: my $qresult='';
2670: my $proname=
2671: "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
2672: my %hash;
2673: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
2674: while (my ($key,$value) = each(%hash)) {
2675: my ($descr,$lasttime,$inst_code);
2676: if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {
2677: ($descr,$inst_code,$lasttime)=($1,$2,$3);
2678: } else {
2679: ($descr,$lasttime) = split(/\:/,$value);
2680: }
2681: if ($lasttime<$since) { next; }
2682: if ($description eq '.') {
2683: $qresult.=$key.'='.$descr.':'.$inst_code.'&';
2684: } else {
2685: my $unescapeVal = &unescape($descr);
2686: if (eval('$unescapeVal=~/\Q$description\E/i')) {
2687: $qresult.=$key.'='.$descr.':'.$inst_code.'&';
2688: }
2689: }
2690: }
2691: if (untie(%hash)) {
2692: chop($qresult);
2693: print $client "$qresult\n";
2694: } else {
2695: print $client "error: ".($!+0)
2696: ." untie(GDBM) Failed ".
2697: "while attempting courseiddump\n";
2698: }
2699: } else {
2700: print $client "error: ".($!+0)
2701: ." tie(GDBM) Failed ".
2702: "while attempting courseiddump\n";
2703: }
2704: } else {
2705: Reply($client, "refused\n", $userinput);
2706:
2707: }
2708: # ----------------------------------------------------------------------- idput
2709: } elsif ($userinput =~ /^idput/) {
2710: if(isClient) {
2711: my ($cmd,$udom,$what)=split(/:/,$userinput);
2712: chomp($what);
2713: $udom=~s/\W//g;
2714: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
2715: my $now=time;
2716: my @pairs=split(/\&/,$what);
2717: my %hash;
2718: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
2719: {
2720: my $hfh;
2721: if ($hfh=IO::File->new(">>$proname.hist")) {
2722: print $hfh "P:$now:$what\n";
2723: }
2724: }
2725: foreach my $pair (@pairs) {
2726: my ($key,$value)=split(/=/,$pair);
2727: $hash{$key}=$value;
2728: }
2729: if (untie(%hash)) {
2730: print $client "ok\n";
2731: } else {
2732: print $client "error: ".($!+0)
2733: ." untie(GDBM) Failed ".
2734: "while attempting idput\n";
2735: }
2736: } else {
2737: print $client "error: ".($!+0)
2738: ." tie(GDBM) Failed ".
2739: "while attempting idput\n";
2740: }
2741: } else {
2742: Reply($client, "refused\n", $userinput);
2743:
2744: }
2745: # ----------------------------------------------------------------------- idget
2746: } elsif ($userinput =~ /^idget/) {
2747: if(isClient) {
2748: my ($cmd,$udom,$what)=split(/:/,$userinput);
2749: chomp($what);
2750: $udom=~s/\W//g;
2751: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
2752: my @queries=split(/\&/,$what);
2753: my $qresult='';
2754: my %hash;
2755: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
2756: for (my $i=0;$i<=$#queries;$i++) {
2757: $qresult.="$hash{$queries[$i]}&";
2758: }
2759: if (untie(%hash)) {
2760: $qresult=~s/\&$//;
2761: print $client "$qresult\n";
2762: } else {
2763: print $client "error: ".($!+0)
2764: ." untie(GDBM) Failed ".
2765: "while attempting idget\n";
2766: }
2767: } else {
2768: print $client "error: ".($!+0)
2769: ." tie(GDBM) Failed ".
2770: "while attempting idget\n";
2771: }
2772: } else {
2773: Reply($client, "refused\n", $userinput);
2774:
2775: }
2776: # ---------------------------------------------------------------------- tmpput
2777: } elsif ($userinput =~ /^tmpput/) {
2778: if(isClient) {
2779: my ($cmd,$what)=split(/:/,$userinput);
2780: my $store;
2781: $tmpsnum++;
2782: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
2783: $id=~s/\W/\_/g;
2784: $what=~s/\n//g;
2785: my $execdir=$perlvar{'lonDaemons'};
2786: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
2787: print $store $what;
2788: close $store;
2789: print $client "$id\n";
2790: }
2791: else {
2792: print $client "error: ".($!+0)
2793: ."IO::File->new Failed ".
2794: "while attempting tmpput\n";
2795: }
2796: } else {
2797: Reply($client, "refused\n", $userinput);
2798:
2799: }
2800:
2801: # ---------------------------------------------------------------------- tmpget
2802: } elsif ($userinput =~ /^tmpget/) {
2803: if(isClient) {
2804: my ($cmd,$id)=split(/:/,$userinput);
2805: chomp($id);
2806: $id=~s/\W/\_/g;
2807: my $store;
2808: my $execdir=$perlvar{'lonDaemons'};
2809: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
2810: my $reply=<$store>;
2811: print $client "$reply\n";
2812: close $store;
2813: }
2814: else {
2815: print $client "error: ".($!+0)
2816: ."IO::File->new Failed ".
2817: "while attempting tmpget\n";
2818: }
2819: } else {
2820: Reply($client, "refused\n", $userinput);
2821:
2822: }
2823: # ---------------------------------------------------------------------- tmpdel
2824: } elsif ($userinput =~ /^tmpdel/) {
2825: if(isClient) {
2826: my ($cmd,$id)=split(/:/,$userinput);
2827: chomp($id);
2828: $id=~s/\W/\_/g;
2829: my $execdir=$perlvar{'lonDaemons'};
2830: if (unlink("$execdir/tmp/$id.tmp")) {
2831: print $client "ok\n";
2832: } else {
2833: print $client "error: ".($!+0)
2834: ."Unlink tmp Failed ".
2835: "while attempting tmpdel\n";
2836: }
2837: } else {
2838: Reply($client, "refused\n", $userinput);
2839:
2840: }
2841: # ----------------------------------------- portfolio directory list (portls)
2842: } elsif ($userinput =~ /^portls/) {
2843: if(isClient) {
2844: my ($cmd,$uname,$udom)=split(/:/,$userinput);
2845: my $udir=propath($udom,$uname).'/userfiles/portfolio';
2846: my $dirLine='';
2847: my $dirContents='';
2848: if (opendir(LSDIR,$udir.'/')){
2849: while ($dirLine = readdir(LSDIR)){
2850: $dirContents = $dirContents.$dirLine.'<br />';
2851: }
2852: } else {
2853: $dirContents = "No directory found\n";
2854: }
2855: print $client $dirContents."\n";
2856: } else {
2857: Reply($client, "refused\n", $userinput);
2858: }
2859: # -------------------------------------------------------------------------- ls
2860: } elsif ($userinput =~ /^ls/) {
2861: if(isClient) {
2862: my $obs;
2863: my $rights;
2864: my ($cmd,$ulsdir)=split(/:/,$userinput);
2865: my $ulsout='';
2866: my $ulsfn;
2867: if (-e $ulsdir) {
2868: if(-d $ulsdir) {
2869: if (opendir(LSDIR,$ulsdir)) {
2870: while ($ulsfn=readdir(LSDIR)) {
2871: undef $obs, $rights;
2872: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
2873: #We do some obsolete checking here
2874: if(-e $ulsdir.'/'.$ulsfn.".meta") {
2875: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
2876: my @obsolete=<FILE>;
2877: foreach my $obsolete (@obsolete) {
2878: if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
2879: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
2880: }
2881: }
2882: $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
2883: if($obs eq '1') { $ulsout.="&1"; }
2884: else { $ulsout.="&0"; }
2885: if($rights eq '1') { $ulsout.="&1:"; }
2886: else { $ulsout.="&0:"; }
2887: }
2888: closedir(LSDIR);
2889: }
2890: } else {
2891: my @ulsstats=stat($ulsdir);
2892: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
2893: }
2894: } else {
2895: $ulsout='no_such_dir';
2896: }
2897: if ($ulsout eq '') { $ulsout='empty'; }
2898: print $client "$ulsout\n";
2899: } else {
2900: Reply($client, "refused\n", $userinput);
2901:
2902: }
2903: # ----------------------------------------------------------------- setannounce
2904: } elsif ($userinput =~ /^setannounce/) {
2905: if (isClient) {
2906: my ($cmd,$announcement)=split(/:/,$userinput);
2907: chomp($announcement);
2908: $announcement=&unescape($announcement);
2909: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
2910: '/announcement.txt')) {
2911: print $store $announcement;
2912: close $store;
2913: print $client "ok\n";
2914: } else {
2915: print $client "error: ".($!+0)."\n";
2916: }
2917: } else {
2918: Reply($client, "refused\n", $userinput);
2919:
2920: }
2921: # ------------------------------------------------------------------ Hanging up
2922: } elsif (($userinput =~ /^exit/) ||
2923: ($userinput =~ /^init/)) { # no restrictions.
2924: &logthis(
2925: "Client $clientip ($clientname) hanging up: $userinput");
2926: print $client "bye\n";
2927: $client->shutdown(2); # shutdown the socket forcibly.
2928: $client->close();
2929: return 0;
2930:
2931: # ---------------------------------- set current host/domain
2932: } elsif ($userinput =~ /^sethost:/) {
2933: if (isClient) {
2934: print $client &sethost($userinput)."\n";
2935: } else {
2936: print $client "refused\n";
2937: }
2938: #---------------------------------- request file (?) version.
2939: } elsif ($userinput =~/^version:/) {
2940: if (isClient) {
2941: print $client &version($userinput)."\n";
2942: } else {
2943: print $client "refused\n";
2944: }
2945: #------------------------------- is auto-enrollment enabled?
2946: } elsif ($userinput =~/^autorun:/) {
2947: if (isClient) {
2948: my ($cmd,$cdom) = split(/:/,$userinput);
2949: my $outcome = &localenroll::run($cdom);
2950: print $client "$outcome\n";
2951: } else {
2952: print $client "0\n";
2953: }
2954: #------------------------------- get official sections (for auto-enrollment).
2955: } elsif ($userinput =~/^autogetsections:/) {
2956: if (isClient) {
2957: my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
2958: my @secs = &localenroll::get_sections($coursecode,$cdom);
2959: my $seclist = &escape(join(':',@secs));
2960: print $client "$seclist\n";
2961: } else {
2962: print $client "refused\n";
2963: }
2964: #----------------------- validate owner of new course section (for auto-enrollment).
2965: } elsif ($userinput =~/^autonewcourse:/) {
2966: if (isClient) {
2967: my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
2968: my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
2969: print $client "$outcome\n";
2970: } else {
2971: print $client "refused\n";
2972: }
2973: #-------------- validate course section in schedule of classes (for auto-enrollment).
2974: } elsif ($userinput =~/^autovalidatecourse:/) {
2975: if (isClient) {
2976: my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
2977: my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
2978: print $client "$outcome\n";
2979: } else {
2980: print $client "refused\n";
2981: }
2982: #--------------------------- create password for new user (for auto-enrollment).
2983: } elsif ($userinput =~/^autocreatepassword:/) {
2984: if (isClient) {
2985: my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
2986: my ($create_passwd,$authchk);
2987: ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);
2988: print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
2989: } else {
2990: print $client "refused\n";
2991: }
2992: #--------------------------- read and remove temporary files (for auto-enrollment).
2993: } elsif ($userinput =~/^autoretrieve:/) {
2994: if (isClient) {
2995: my ($cmd,$filename) = split(/:/,$userinput);
2996: my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
2997: if ( (-e $source) && ($filename ne '') ) {
2998: my $reply = '';
2999: if (open(my $fh,$source)) {
3000: while (<$fh>) {
3001: chomp($_);
3002: $_ =~ s/^\s+//g;
3003: $_ =~ s/\s+$//g;
3004: $reply .= $_;
3005: }
3006: close($fh);
3007: print $client &escape($reply)."\n";
3008: # unlink($source);
3009: } else {
3010: print $client "error\n";
3011: }
3012: } else {
3013: print $client "error\n";
3014: }
3015: } else {
3016: print $client "refused\n";
3017: }
3018: #--------------------- read and retrieve institutional code format (for support form).
3019: } elsif ($userinput =~/^autoinstcodeformat:/) {
3020: if (isClient) {
3021: my $reply;
3022: my($cmd,$cdom,$course) = split(/:/,$userinput);
3023: my @pairs = split/\&/,$course;
3024: my %instcodes = ();
3025: my %codes = ();
3026: my @codetitles = ();
3027: my %cat_titles = ();
3028: my %cat_order = ();
3029: foreach (@pairs) {
3030: my ($key,$value) = split/=/,$_;
3031: $instcodes{&unescape($key)} = &unescape($value);
3032: }
3033: my $formatreply = &localenroll::instcode_format($cdom,\%instcodes,\%codes,\@codetitles,\%cat_titles,\%cat_order);
3034: if ($formatreply eq 'ok') {
3035: my $codes_str = &hash2str(%codes);
3036: my $codetitles_str = &array2str(@codetitles);
3037: my $cat_titles_str = &hash2str(%cat_titles);
3038: my $cat_order_str = &hash2str(%cat_order);
3039: print $client $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'.$cat_order_str."\n";
3040: }
3041: } else {
3042: print $client "refused\n";
3043: }
3044: # ------------------------------------------------------------- unknown command
3045:
3046: } else {
3047: # unknown command
3048: print $client "unknown_cmd\n";
3049: }
3050: # -------------------------------------------------------------------- complete
3051: Debug("process_request - returning 1");
3052: return 1;
3053: }
3054: #
3055: # Decipher encoded traffic
3056: # Parameters:
3057: # input - Encoded data.
3058: # Returns:
3059: # Decoded data or undef if encryption key was not yet negotiated.
3060: # Implicit input:
3061: # cipher - This global holds the negotiated encryption key.
3062: #
3063: sub decipher {
3064: my ($input) = @_;
3065: my $output = '';
3066:
3067:
3068: if($cipher) {
3069: my($enc, $enclength, $encinput) = split(/:/, $input);
3070: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
3071: $output .=
3072: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
3073: }
3074: return substr($output, 0, $enclength);
3075: } else {
3076: return undef;
3077: }
3078: }
3079:
3080: #
3081: # Register a command processor. This function is invoked to register a sub
3082: # to process a request. Once registered, the ProcessRequest sub can automatically
3083: # dispatch requests to an appropriate sub, and do the top level validity checking
3084: # as well:
3085: # - Is the keyword recognized.
3086: # - Is the proper client type attempting the request.
3087: # - Is the request encrypted if it has to be.
3088: # Parameters:
3089: # $request_name - Name of the request being registered.
3090: # This is the command request that will match
3091: # against the hash keywords to lookup the information
3092: # associated with the dispatch information.
3093: # $procedure - Reference to a sub to call to process the request.
3094: # All subs get called as follows:
3095: # Procedure($cmd, $tail, $replyfd, $key)
3096: # $cmd - the actual keyword that invoked us.
3097: # $tail - the tail of the request that invoked us.
3098: # $replyfd- File descriptor connected to the client
3099: # $must_encode - True if the request must be encoded to be good.
3100: # $client_ok - True if it's ok for a client to request this.
3101: # $manager_ok - True if it's ok for a manager to request this.
3102: # Side effects:
3103: # - On success, the Dispatcher hash has an entry added for the key $RequestName
3104: # - On failure, the program will die as it's a bad internal bug to try to
3105: # register a duplicate command handler.
3106: #
3107: sub register_handler {
3108: my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_;
3109:
3110: # Don't allow duplication#
3111:
3112: if (defined $Dispatcher{$request_name}) {
3113: die "Attempting to define a duplicate request handler for $request_name\n";
3114: }
3115: # Build the client type mask:
3116:
3117: my $client_type_mask = 0;
3118: if($client_ok) {
3119: $client_type_mask |= $CLIENT_OK;
3120: }
3121: if($manager_ok) {
3122: $client_type_mask |= $MANAGER_OK;
3123: }
3124:
3125: # Enter the hash:
3126:
3127: my @entry = ($procedure, $must_encode, $client_type_mask);
3128:
3129: $Dispatcher{$request_name} = \@entry;
3130:
3131: }
3132:
3133:
3134: #------------------------------------------------------------------
3135:
3136:
3137:
3138:
3139: #
3140: # Convert an error return code from lcpasswd to a string value.
3141: #
3142: sub lcpasswdstrerror {
3143: my $ErrorCode = shift;
3144: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
3145: return "lcpasswd Unrecognized error return value ".$ErrorCode;
3146: } else {
3147: return $passwderrors[$ErrorCode];
3148: }
3149: }
3150:
3151: #
3152: # Convert an error return code from lcuseradd to a string value:
3153: #
3154: sub lcuseraddstrerror {
3155: my $ErrorCode = shift;
3156: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
3157: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
3158: } else {
3159: return $adderrors[$ErrorCode];
3160: }
3161: }
3162:
3163: # grabs exception and records it to log before exiting
3164: sub catchexception {
3165: my ($error)=@_;
3166: $SIG{'QUIT'}='DEFAULT';
3167: $SIG{__DIE__}='DEFAULT';
3168: &status("Catching exception");
3169: &logthis("<font color='red'>CRITICAL: "
3170: ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
3171: ."a crash with this error msg->[$error]</font>");
3172: &logthis('Famous last words: '.$status.' - '.$lastlog);
3173: if ($client) { print $client "error: $error\n"; }
3174: $server->close();
3175: die($error);
3176: }
3177: sub timeout {
3178: &status("Handling Timeout");
3179: &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
3180: &catchexception('Timeout');
3181: }
3182: # -------------------------------- Set signal handlers to record abnormal exits
3183:
3184:
3185: $SIG{'QUIT'}=\&catchexception;
3186: $SIG{__DIE__}=\&catchexception;
3187:
3188: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
3189: &status("Read loncapa.conf and loncapa_apache.conf");
3190: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
3191: %perlvar=%{$perlvarref};
3192: undef $perlvarref;
3193:
3194: # ----------------------------- Make sure this process is running from user=www
3195: my $wwwid=getpwnam('www');
3196: if ($wwwid!=$<) {
3197: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
3198: my $subj="LON: $currenthostid User ID mismatch";
3199: system("echo 'User ID mismatch. lond must be run as user www.' |\
3200: mailto $emailto -s '$subj' > /dev/null");
3201: exit 1;
3202: }
3203:
3204: # --------------------------------------------- Check if other instance running
3205:
3206: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
3207:
3208: if (-e $pidfile) {
3209: my $lfh=IO::File->new("$pidfile");
3210: my $pide=<$lfh>;
3211: chomp($pide);
3212: if (kill 0 => $pide) { die "already running"; }
3213: }
3214:
3215: # ------------------------------------------------------------- Read hosts file
3216:
3217:
3218:
3219: # establish SERVER socket, bind and listen.
3220: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
3221: Type => SOCK_STREAM,
3222: Proto => 'tcp',
3223: Reuse => 1,
3224: Listen => 10 )
3225: or die "making socket: $@\n";
3226:
3227: # --------------------------------------------------------- Do global variables
3228:
3229: # global variables
3230:
3231: my %children = (); # keys are current child process IDs
3232:
3233: sub REAPER { # takes care of dead children
3234: $SIG{CHLD} = \&REAPER;
3235: &status("Handling child death");
3236: my $pid;
3237: do {
3238: $pid = waitpid(-1,&WNOHANG());
3239: if (defined($children{$pid})) {
3240: &logthis("Child $pid died");
3241: delete($children{$pid});
3242: } elsif ($pid > 0) {
3243: &logthis("Unknown Child $pid died");
3244: }
3245: } while ( $pid > 0 );
3246: foreach my $child (keys(%children)) {
3247: $pid = waitpid($child,&WNOHANG());
3248: if ($pid > 0) {
3249: &logthis("Child $child - $pid looks like we missed it's death");
3250: delete($children{$pid});
3251: }
3252: }
3253: &status("Finished Handling child death");
3254: }
3255:
3256: sub HUNTSMAN { # signal handler for SIGINT
3257: &status("Killing children (INT)");
3258: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
3259: kill 'INT' => keys %children;
3260: &logthis("Free socket: ".shutdown($server,2)); # free up socket
3261: my $execdir=$perlvar{'lonDaemons'};
3262: unlink("$execdir/logs/lond.pid");
3263: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
3264: &status("Done killing children");
3265: exit; # clean up with dignity
3266: }
3267:
3268: sub HUPSMAN { # signal handler for SIGHUP
3269: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
3270: &status("Killing children for restart (HUP)");
3271: kill 'INT' => keys %children;
3272: &logthis("Free socket: ".shutdown($server,2)); # free up socket
3273: &logthis("<font color='red'>CRITICAL: Restarting</font>");
3274: my $execdir=$perlvar{'lonDaemons'};
3275: unlink("$execdir/logs/lond.pid");
3276: &status("Restarting self (HUP)");
3277: exec("$execdir/lond"); # here we go again
3278: }
3279:
3280: #
3281: # Kill off hashes that describe the host table prior to re-reading it.
3282: # Hashes affected are:
3283: # %hostid, %hostdom %hostip %hostdns.
3284: #
3285: sub KillHostHashes {
3286: foreach my $key (keys %hostid) {
3287: delete $hostid{$key};
3288: }
3289: foreach my $key (keys %hostdom) {
3290: delete $hostdom{$key};
3291: }
3292: foreach my $key (keys %hostip) {
3293: delete $hostip{$key};
3294: }
3295: foreach my $key (keys %hostdns) {
3296: delete $hostdns{$key};
3297: }
3298: }
3299: #
3300: # Read in the host table from file and distribute it into the various hashes:
3301: #
3302: # - %hostid - Indexed by IP, the loncapa hostname.
3303: # - %hostdom - Indexed by loncapa hostname, the domain.
3304: # - %hostip - Indexed by hostid, the Ip address of the host.
3305: sub ReadHostTable {
3306:
3307: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
3308: my $myloncapaname = $perlvar{'lonHostID'};
3309: Debug("My loncapa name is : $myloncapaname");
3310: while (my $configline=<CONFIG>) {
3311: if (!($configline =~ /^\s*\#/)) {
3312: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
3313: chomp($ip); $ip=~s/\D+$//;
3314: $hostid{$ip}=$id; # LonCAPA name of host by IP.
3315: $hostdom{$id}=$domain; # LonCAPA domain name of host.
3316: $hostip{$id}=$ip; # IP address of host.
3317: $hostdns{$name} = $id; # LonCAPA name of host by DNS.
3318:
3319: if ($id eq $perlvar{'lonHostID'}) {
3320: Debug("Found me in the host table: $name");
3321: $thisserver=$name;
3322: }
3323: }
3324: }
3325: close(CONFIG);
3326: }
3327: #
3328: # Reload the Apache daemon's state.
3329: # This is done by invoking /home/httpd/perl/apachereload
3330: # a setuid perl script that can be root for us to do this job.
3331: #
3332: sub ReloadApache {
3333: my $execdir = $perlvar{'lonDaemons'};
3334: my $script = $execdir."/apachereload";
3335: system($script);
3336: }
3337:
3338: #
3339: # Called in response to a USR2 signal.
3340: # - Reread hosts.tab
3341: # - All children connected to hosts that were removed from hosts.tab
3342: # are killed via SIGINT
3343: # - All children connected to previously existing hosts are sent SIGUSR1
3344: # - Our internal hosts hash is updated to reflect the new contents of
3345: # hosts.tab causing connections from hosts added to hosts.tab to
3346: # now be honored.
3347: #
3348: sub UpdateHosts {
3349: &status("Reload hosts.tab");
3350: logthis('<font color="blue"> Updating connections </font>');
3351: #
3352: # The %children hash has the set of IP's we currently have children
3353: # on. These need to be matched against records in the hosts.tab
3354: # Any ip's no longer in the table get killed off they correspond to
3355: # either dropped or changed hosts. Note that the re-read of the table
3356: # will take care of new and changed hosts as connections come into being.
3357:
3358:
3359: KillHostHashes;
3360: ReadHostTable;
3361:
3362: foreach my $child (keys %children) {
3363: my $childip = $children{$child};
3364: if(!$hostid{$childip}) {
3365: logthis('<font color="blue"> UpdateHosts killing child '
3366: ." $child for ip $childip </font>");
3367: kill('INT', $child);
3368: } else {
3369: logthis('<font color="green"> keeping child for ip '
3370: ." $childip (pid=$child) </font>");
3371: }
3372: }
3373: ReloadApache;
3374: &status("Finished reloading hosts.tab");
3375: }
3376:
3377:
3378: sub checkchildren {
3379: &status("Checking on the children (sending signals)");
3380: &initnewstatus();
3381: &logstatus();
3382: &logthis('Going to check on the children');
3383: my $docdir=$perlvar{'lonDocRoot'};
3384: foreach (sort keys %children) {
3385: #sleep 1;
3386: unless (kill 'USR1' => $_) {
3387: &logthis ('Child '.$_.' is dead');
3388: &logstatus($$.' is dead');
3389: delete($children{$_});
3390: }
3391: }
3392: sleep 5;
3393: $SIG{ALRM} = sub { Debug("timeout");
3394: die "timeout"; };
3395: $SIG{__DIE__} = 'DEFAULT';
3396: &status("Checking on the children (waiting for reports)");
3397: foreach (sort keys %children) {
3398: unless (-e "$docdir/lon-status/londchld/$_.txt") {
3399: eval {
3400: alarm(300);
3401: &logthis('Child '.$_.' did not respond');
3402: kill 9 => $_;
3403: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
3404: #$subj="LON: $currenthostid killed lond process $_";
3405: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
3406: #$execdir=$perlvar{'lonDaemons'};
3407: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
3408: delete($children{$_});
3409: alarm(0);
3410: }
3411: }
3412: }
3413: $SIG{ALRM} = 'DEFAULT';
3414: $SIG{__DIE__} = \&catchexception;
3415: &status("Finished checking children");
3416: &logthis('Finished Checking children');
3417: }
3418:
3419: # --------------------------------------------------------------------- Logging
3420:
3421: sub logthis {
3422: my $message=shift;
3423: my $execdir=$perlvar{'lonDaemons'};
3424: my $fh=IO::File->new(">>$execdir/logs/lond.log");
3425: my $now=time;
3426: my $local=localtime($now);
3427: $lastlog=$local.': '.$message;
3428: print $fh "$local ($$): $message\n";
3429: }
3430:
3431: # ------------------------- Conditional log if $DEBUG true.
3432: sub Debug {
3433: my $message = shift;
3434: if($DEBUG) {
3435: &logthis($message);
3436: }
3437: }
3438:
3439: #
3440: # Sub to do replies to client.. this gives a hook for some
3441: # debug tracing too:
3442: # Parameters:
3443: # fd - File open on client.
3444: # reply - Text to send to client.
3445: # request - Original request from client.
3446: #
3447: sub Reply {
3448: my ($fd, $reply, $request) = @_;
3449: print $fd $reply;
3450: Debug("Request was $request Reply was $reply");
3451:
3452: $Transactions++;
3453:
3454:
3455: }
3456:
3457:
3458: #
3459: # Sub to report a failure.
3460: # This function:
3461: # - Increments the failure statistic counters.
3462: # - Invokes Reply to send the error message to the client.
3463: # Parameters:
3464: # fd - File descriptor open on the client
3465: # reply - Reply text to emit.
3466: # request - The original request message (used by Reply
3467: # to debug if that's enabled.
3468: # Implicit outputs:
3469: # $Failures- The number of failures is incremented.
3470: # Reply (invoked here) sends a message to the
3471: # client:
3472: #
3473: sub Failure {
3474: my $fd = shift;
3475: my $reply = shift;
3476: my $request = shift;
3477:
3478: $Failures++;
3479: Reply($fd, $reply, $request); # That's simple eh?
3480: }
3481: # ------------------------------------------------------------------ Log status
3482:
3483: sub logstatus {
3484: &status("Doing logging");
3485: my $docdir=$perlvar{'lonDocRoot'};
3486: {
3487: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
3488: print $fh $status."\n".$lastlog."\n".time."\n$keymode";
3489: $fh->close();
3490: }
3491: &status("Finished $$.txt");
3492: {
3493: open(LOG,">>$docdir/lon-status/londstatus.txt");
3494: flock(LOG,LOCK_EX);
3495: print LOG $$."\t".$clientname."\t".$currenthostid."\t"
3496: .$status."\t".$lastlog."\t $keymode\n";
3497: flock(DB,LOCK_UN);
3498: close(LOG);
3499: }
3500: &status("Finished logging");
3501: }
3502:
3503: sub initnewstatus {
3504: my $docdir=$perlvar{'lonDocRoot'};
3505: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
3506: my $now=time;
3507: my $local=localtime($now);
3508: print $fh "LOND status $local - parent $$\n\n";
3509: opendir(DIR,"$docdir/lon-status/londchld");
3510: while (my $filename=readdir(DIR)) {
3511: unlink("$docdir/lon-status/londchld/$filename");
3512: }
3513: closedir(DIR);
3514: }
3515:
3516: # -------------------------------------------------------------- Status setting
3517:
3518: sub status {
3519: my $what=shift;
3520: my $now=time;
3521: my $local=localtime($now);
3522: $status=$local.': '.$what;
3523: $0='lond: '.$what.' '.$local;
3524: }
3525:
3526: # -------------------------------------------------------- Escape Special Chars
3527:
3528: sub escape {
3529: my $str=shift;
3530: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
3531: return $str;
3532: }
3533:
3534: # ----------------------------------------------------- Un-Escape Special Chars
3535:
3536: sub unescape {
3537: my $str=shift;
3538: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
3539: return $str;
3540: }
3541:
3542: # ----------------------------------------------------------- Send USR1 to lonc
3543:
3544: sub reconlonc {
3545: my $peerfile=shift;
3546: &logthis("Trying to reconnect for $peerfile");
3547: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
3548: if (my $fh=IO::File->new("$loncfile")) {
3549: my $loncpid=<$fh>;
3550: chomp($loncpid);
3551: if (kill 0 => $loncpid) {
3552: &logthis("lonc at pid $loncpid responding, sending USR1");
3553: kill USR1 => $loncpid;
3554: } else {
3555: &logthis(
3556: "<font color='red'>CRITICAL: "
3557: ."lonc at pid $loncpid not responding, giving up</font>");
3558: }
3559: } else {
3560: &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
3561: }
3562: }
3563:
3564: # -------------------------------------------------- Non-critical communication
3565:
3566: sub subreply {
3567: my ($cmd,$server)=@_;
3568: my $peerfile="$perlvar{'lonSockDir'}/$server";
3569: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
3570: Type => SOCK_STREAM,
3571: Timeout => 10)
3572: or return "con_lost";
3573: print $sclient "$cmd\n";
3574: my $answer=<$sclient>;
3575: chomp($answer);
3576: if (!$answer) { $answer="con_lost"; }
3577: return $answer;
3578: }
3579:
3580: sub reply {
3581: my ($cmd,$server)=@_;
3582: my $answer;
3583: if ($server ne $currenthostid) {
3584: $answer=subreply($cmd,$server);
3585: if ($answer eq 'con_lost') {
3586: $answer=subreply("ping",$server);
3587: if ($answer ne $server) {
3588: &logthis("sub reply: answer != server answer is $answer, server is $server");
3589: &reconlonc("$perlvar{'lonSockDir'}/$server");
3590: }
3591: $answer=subreply($cmd,$server);
3592: }
3593: } else {
3594: $answer='self_reply';
3595: }
3596: return $answer;
3597: }
3598:
3599: # -------------------------------------------------------------- Talk to lonsql
3600:
3601: sub sqlreply {
3602: my ($cmd)=@_;
3603: my $answer=subsqlreply($cmd);
3604: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
3605: return $answer;
3606: }
3607:
3608: sub subsqlreply {
3609: my ($cmd)=@_;
3610: my $unixsock="mysqlsock";
3611: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
3612: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
3613: Type => SOCK_STREAM,
3614: Timeout => 10)
3615: or return "con_lost";
3616: print $sclient "$cmd\n";
3617: my $answer=<$sclient>;
3618: chomp($answer);
3619: if (!$answer) { $answer="con_lost"; }
3620: return $answer;
3621: }
3622:
3623: # -------------------------------------------- Return path to profile directory
3624:
3625: sub propath {
3626: my ($udom,$uname)=@_;
3627: $udom=~s/\W//g;
3628: $uname=~s/\W//g;
3629: my $subdir=$uname.'__';
3630: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
3631: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
3632: return $proname;
3633: }
3634:
3635: # --------------------------------------- Is this the home server of an author?
3636:
3637: sub ishome {
3638: my $author=shift;
3639: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
3640: my ($udom,$uname)=split(/\//,$author);
3641: my $proname=propath($udom,$uname);
3642: if (-e $proname) {
3643: return 'owner';
3644: } else {
3645: return 'not_owner';
3646: }
3647: }
3648:
3649: # ======================================================= Continue main program
3650: # ---------------------------------------------------- Fork once and dissociate
3651:
3652: my $fpid=fork;
3653: exit if $fpid;
3654: die "Couldn't fork: $!" unless defined ($fpid);
3655:
3656: POSIX::setsid() or die "Can't start new session: $!";
3657:
3658: # ------------------------------------------------------- Write our PID on disk
3659:
3660: my $execdir=$perlvar{'lonDaemons'};
3661: open (PIDSAVE,">$execdir/logs/lond.pid");
3662: print PIDSAVE "$$\n";
3663: close(PIDSAVE);
3664: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
3665: &status('Starting');
3666:
3667:
3668:
3669: # ----------------------------------------------------- Install signal handlers
3670:
3671:
3672: $SIG{CHLD} = \&REAPER;
3673: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
3674: $SIG{HUP} = \&HUPSMAN;
3675: $SIG{USR1} = \&checkchildren;
3676: $SIG{USR2} = \&UpdateHosts;
3677:
3678: # Read the host hashes:
3679:
3680: ReadHostTable;
3681:
3682: # --------------------------------------------------------------
3683: # Accept connections. When a connection comes in, it is validated
3684: # and if good, a child process is created to process transactions
3685: # along the connection.
3686:
3687: while (1) {
3688: &status('Starting accept');
3689: $client = $server->accept() or next;
3690: &status('Accepted '.$client.' off to spawn');
3691: make_new_child($client);
3692: &status('Finished spawning');
3693: }
3694:
3695: sub make_new_child {
3696: my $pid;
3697: # my $cipher; # Now global
3698: my $sigset;
3699:
3700: $client = shift;
3701: &status('Starting new child '.$client);
3702: &logthis('<font color="green"> Attempting to start child ('.$client.
3703: ")</font>");
3704: # block signal for fork
3705: $sigset = POSIX::SigSet->new(SIGINT);
3706: sigprocmask(SIG_BLOCK, $sigset)
3707: or die "Can't block SIGINT for fork: $!\n";
3708:
3709: die "fork: $!" unless defined ($pid = fork);
3710:
3711: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
3712: # connection liveness.
3713:
3714: #
3715: # Figure out who we're talking to so we can record the peer in
3716: # the pid hash.
3717: #
3718: my $caller = getpeername($client);
3719: my ($port,$iaddr);
3720: if (defined($caller) && length($caller) > 0) {
3721: ($port,$iaddr)=unpack_sockaddr_in($caller);
3722: } else {
3723: &logthis("Unable to determine who caller was, getpeername returned nothing");
3724: }
3725: if (defined($iaddr)) {
3726: $clientip = inet_ntoa($iaddr);
3727: Debug("Connected with $clientip");
3728: $clientdns = gethostbyaddr($iaddr, AF_INET);
3729: Debug("Connected with $clientdns by name");
3730: } else {
3731: &logthis("Unable to determine clientip");
3732: $clientip='Unavailable';
3733: }
3734:
3735: if ($pid) {
3736: # Parent records the child's birth and returns.
3737: sigprocmask(SIG_UNBLOCK, $sigset)
3738: or die "Can't unblock SIGINT for fork: $!\n";
3739: $children{$pid} = $clientip;
3740: &status('Started child '.$pid);
3741: return;
3742: } else {
3743: # Child can *not* return from this subroutine.
3744: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
3745: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
3746: #don't get intercepted
3747: $SIG{USR1}= \&logstatus;
3748: $SIG{ALRM}= \&timeout;
3749: $lastlog='Forked ';
3750: $status='Forked';
3751:
3752: # unblock signals
3753: sigprocmask(SIG_UNBLOCK, $sigset)
3754: or die "Can't unblock SIGINT for fork: $!\n";
3755:
3756: # my $tmpsnum=0; # Now global
3757: #---------------------------------------------------- kerberos 5 initialization
3758: &Authen::Krb5::init_context();
3759: &Authen::Krb5::init_ets();
3760:
3761: &status('Accepted connection');
3762: # =============================================================================
3763: # do something with the connection
3764: # -----------------------------------------------------------------------------
3765: # see if we know client and 'check' for spoof IP by ineffective challenge
3766:
3767: ReadManagerTable; # May also be a manager!!
3768:
3769: my $clientrec=($hostid{$clientip} ne undef);
3770: my $ismanager=($managers{$clientip} ne undef);
3771: $clientname = "[unknonwn]";
3772: if($clientrec) { # Establish client type.
3773: $ConnectionType = "client";
3774: $clientname = $hostid{$clientip};
3775: if($ismanager) {
3776: $ConnectionType = "both";
3777: }
3778: } else {
3779: $ConnectionType = "manager";
3780: $clientname = $managers{$clientip};
3781: }
3782: my $clientok;
3783:
3784: if ($clientrec || $ismanager) {
3785: &status("Waiting for init from $clientip $clientname");
3786: &logthis('<font color="yellow">INFO: Connection, '.
3787: $clientip.
3788: " ($clientname) connection type = $ConnectionType </font>" );
3789: &status("Connecting $clientip ($clientname))");
3790: my $remotereq=<$client>;
3791: chomp($remotereq);
3792: Debug("Got init: $remotereq");
3793: my $inikeyword = split(/:/, $remotereq);
3794: if ($remotereq =~ /^init/) {
3795: &sethost("sethost:$perlvar{'lonHostID'}");
3796: #
3797: # If the remote is attempting a local init... give that a try:
3798: #
3799: my ($i, $inittype) = split(/:/, $remotereq);
3800:
3801: # If the connection type is ssl, but I didn't get my
3802: # certificate files yet, then I'll drop back to
3803: # insecure (if allowed).
3804:
3805: if($inittype eq "ssl") {
3806: my ($ca, $cert) = lonssl::CertificateFile;
3807: my $kfile = lonssl::KeyFile;
3808: if((!$ca) ||
3809: (!$cert) ||
3810: (!$kfile)) {
3811: $inittype = ""; # This forces insecure attempt.
3812: &logthis("<font color=\"blue\"> Certificates not "
3813: ."installed -- trying insecure auth</font>");
3814: } else { # SSL certificates are in place so
3815: } # Leave the inittype alone.
3816: }
3817:
3818: if($inittype eq "local") {
3819: my $key = LocalConnection($client, $remotereq);
3820: if($key) {
3821: Debug("Got local key $key");
3822: $clientok = 1;
3823: my $cipherkey = pack("H32", $key);
3824: $cipher = new IDEA($cipherkey);
3825: print $client "ok:local\n";
3826: &logthis('<font color="green"'
3827: . "Successful local authentication </font>");
3828: $keymode = "local"
3829: } else {
3830: Debug("Failed to get local key");
3831: $clientok = 0;
3832: shutdown($client, 3);
3833: close $client;
3834: }
3835: } elsif ($inittype eq "ssl") {
3836: my $key = SSLConnection($client);
3837: if ($key) {
3838: $clientok = 1;
3839: my $cipherkey = pack("H32", $key);
3840: $cipher = new IDEA($cipherkey);
3841: &logthis('<font color="green">'
3842: ."Successfull ssl authentication with $clientname </font>");
3843: $keymode = "ssl";
3844:
3845: } else {
3846: $clientok = 0;
3847: close $client;
3848: }
3849:
3850: } else {
3851: my $ok = InsecureConnection($client);
3852: if($ok) {
3853: $clientok = 1;
3854: &logthis('<font color="green">'
3855: ."Successful insecure authentication with $clientname </font>");
3856: print $client "ok\n";
3857: $keymode = "insecure";
3858: } else {
3859: &logthis('<font color="yellow">'
3860: ."Attempted insecure connection disallowed </font>");
3861: close $client;
3862: $clientok = 0;
3863:
3864: }
3865: }
3866: } else {
3867: &logthis(
3868: "<font color='blue'>WARNING: "
3869: ."$clientip failed to initialize: >$remotereq< </font>");
3870: &status('No init '.$clientip);
3871: }
3872:
3873: } else {
3874: &logthis(
3875: "<font color='blue'>WARNING: Unknown client $clientip</font>");
3876: &status('Hung up on '.$clientip);
3877: }
3878:
3879: if ($clientok) {
3880: # ---------------- New known client connecting, could mean machine online again
3881:
3882: foreach my $id (keys(%hostip)) {
3883: if ($hostip{$id} ne $clientip ||
3884: $hostip{$currenthostid} eq $clientip) {
3885: # no need to try to do recon's to myself
3886: next;
3887: }
3888: &reconlonc("$perlvar{'lonSockDir'}/$id");
3889: }
3890: &logthis("<font color='green'>Established connection: $clientname</font>");
3891: &status('Will listen to '.$clientname);
3892: # ------------------------------------------------------------ Process requests
3893: my $keep_going = 1;
3894: my $user_input;
3895: while(($user_input = get_request) && $keep_going) {
3896: alarm(120);
3897: Debug("Main: Got $user_input\n");
3898: $keep_going = &process_request($user_input);
3899: alarm(0);
3900: &status('Listening to '.$clientname." ($keymode)");
3901: }
3902:
3903: # --------------------------------------------- client unknown or fishy, refuse
3904: } else {
3905: print $client "refused\n";
3906: $client->close();
3907: &logthis("<font color='blue'>WARNING: "
3908: ."Rejected client $clientip, closing connection</font>");
3909: }
3910: }
3911:
3912: # =============================================================================
3913:
3914: &logthis("<font color='red'>CRITICAL: "
3915: ."Disconnect from $clientip ($clientname)</font>");
3916:
3917:
3918: # this exit is VERY important, otherwise the child will become
3919: # a producer of more and more children, forking yourself into
3920: # process death.
3921: exit;
3922:
3923: }
3924:
3925:
3926: #
3927: # Checks to see if the input roleput request was to set
3928: # an author role. If so, invokes the lchtmldir script to set
3929: # up a correct public_html
3930: # Parameters:
3931: # request - The request sent to the rolesput subchunk.
3932: # We're looking for /domain/_au
3933: # domain - The domain in which the user is having roles doctored.
3934: # user - Name of the user for which the role is being put.
3935: # authtype - The authentication type associated with the user.
3936: #
3937: sub ManagePermissions
3938: {
3939:
3940: my ($request, $domain, $user, $authtype) = @_;
3941:
3942: # See if the request is of the form /$domain/_au
3943: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
3944: my $execdir = $perlvar{'lonDaemons'};
3945: my $userhome= "/home/$user" ;
3946: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
3947: system("$execdir/lchtmldir $userhome $user $authtype");
3948: }
3949: }
3950:
3951:
3952: #
3953: # Return the full path of a user password file, whether it exists or not.
3954: # Parameters:
3955: # domain - Domain in which the password file lives.
3956: # user - name of the user.
3957: # Returns:
3958: # Full passwd path:
3959: #
3960: sub password_path {
3961: my ($domain, $user) = @_;
3962:
3963:
3964: my $path = &propath($domain, $user);
3965: $path .= "/passwd";
3966:
3967: return $path;
3968: }
3969:
3970: # Password Filename
3971: # Returns the path to a passwd file given domain and user... only if
3972: # it exists.
3973: # Parameters:
3974: # domain - Domain in which to search.
3975: # user - username.
3976: # Returns:
3977: # - If the password file exists returns its path.
3978: # - If the password file does not exist, returns undefined.
3979: #
3980: sub password_filename {
3981: my ($domain, $user) = @_;
3982:
3983: Debug ("PasswordFilename called: dom = $domain user = $user");
3984:
3985: my $path = &password_path($domain, $user);
3986: Debug("PasswordFilename got path: $path");
3987: if(-e $path) {
3988: return $path;
3989: } else {
3990: return undef;
3991: }
3992: }
3993:
3994: #
3995: # Rewrite the contents of the user's passwd file.
3996: # Parameters:
3997: # domain - domain of the user.
3998: # name - User's name.
3999: # contents - New contents of the file.
4000: # Returns:
4001: # 0 - Failed.
4002: # 1 - Success.
4003: #
4004: sub rewrite_password_file {
4005: my ($domain, $user, $contents) = @_;
4006:
4007: my $file = &password_filename($domain, $user);
4008: if (defined $file) {
4009: my $pf = IO::File->new(">$file");
4010: if($pf) {
4011: print $pf "$contents\n";
4012: return 1;
4013: } else {
4014: return 0;
4015: }
4016: } else {
4017: return 0;
4018: }
4019:
4020: }
4021:
4022: #
4023: # get_auth_type - Determines the authorization type of a user in a domain.
4024:
4025: # Returns the authorization type or nouser if there is no such user.
4026: #
4027: sub get_auth_type
4028: {
4029:
4030: my ($domain, $user) = @_;
4031:
4032: Debug("get_auth_type( $domain, $user ) \n");
4033: my $proname = &propath($domain, $user);
4034: my $passwdfile = "$proname/passwd";
4035: if( -e $passwdfile ) {
4036: my $pf = IO::File->new($passwdfile);
4037: my $realpassword = <$pf>;
4038: chomp($realpassword);
4039: Debug("Password info = $realpassword\n");
4040: my ($authtype, $contentpwd) = split(/:/, $realpassword);
4041: Debug("Authtype = $authtype, content = $contentpwd\n");
4042: my $availinfo = '';
4043: if($authtype eq 'krb4' or $authtype eq 'krb5') {
4044: $availinfo = $contentpwd;
4045: }
4046:
4047: return "$authtype:$availinfo";
4048: } else {
4049: Debug("Returning nouser");
4050: return "nouser";
4051: }
4052: }
4053:
4054: #
4055: # Validate a user given their domain, name and password. This utility
4056: # function is used by both AuthenticateHandler and ChangePasswordHandler
4057: # to validate the login credentials of a user.
4058: # Parameters:
4059: # $domain - The domain being logged into (this is required due to
4060: # the capability for multihomed systems.
4061: # $user - The name of the user being validated.
4062: # $password - The user's propoposed password.
4063: #
4064: # Returns:
4065: # 1 - The domain,user,pasword triplet corresponds to a valid
4066: # user.
4067: # 0 - The domain,user,password triplet is not a valid user.
4068: #
4069: sub validate_user {
4070: my ($domain, $user, $password) = @_;
4071:
4072:
4073: # Why negative ~pi you may well ask? Well this function is about
4074: # authentication, and therefore very important to get right.
4075: # I've initialized the flag that determines whether or not I've
4076: # validated correctly to a value it's not supposed to get.
4077: # At the end of this function. I'll ensure that it's not still that
4078: # value so we don't just wind up returning some accidental value
4079: # as a result of executing an unforseen code path that
4080: # did not set $validated.
4081:
4082: my $validated = -3.14159;
4083:
4084: # How we authenticate is determined by the type of authentication
4085: # the user has been assigned. If the authentication type is
4086: # "nouser", the user does not exist so we will return 0.
4087:
4088: my $contents = &get_auth_type($domain, $user);
4089: my ($howpwd, $contentpwd) = split(/:/, $contents);
4090:
4091: my $null = pack("C",0); # Used by kerberos auth types.
4092:
4093: if ($howpwd ne 'nouser') {
4094:
4095: if($howpwd eq "internal") { # Encrypted is in local password file.
4096: $validated = (crypt($password, $contentpwd) eq $contentpwd);
4097: }
4098: elsif ($howpwd eq "unix") { # User is a normal unix user.
4099: $contentpwd = (getpwnam($user))[1];
4100: if($contentpwd) {
4101: if($contentpwd eq 'x') { # Shadow password file...
4102: my $pwauth_path = "/usr/local/sbin/pwauth";
4103: open PWAUTH, "|$pwauth_path" or
4104: die "Cannot invoke authentication";
4105: print PWAUTH "$user\n$password\n";
4106: close PWAUTH;
4107: $validated = ! $?;
4108:
4109: } else { # Passwords in /etc/passwd.
4110: $validated = (crypt($password,
4111: $contentpwd) eq $contentpwd);
4112: }
4113: } else {
4114: $validated = 0;
4115: }
4116: }
4117: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
4118: if(! ($password =~ /$null/) ) {
4119: my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
4120: "",
4121: $contentpwd,,
4122: 'krbtgt',
4123: $contentpwd,
4124: 1,
4125: $password);
4126: if(!$k4error) {
4127: $validated = 1;
4128: } else {
4129: $validated = 0;
4130: &logthis('krb4: '.$user.', '.$contentpwd.', '.
4131: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
4132: }
4133: } else {
4134: $validated = 0; # Password has a match with null.
4135: }
4136: } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
4137: if(!($password =~ /$null/)) { # Null password not allowed.
4138: my $krbclient = &Authen::Krb5::parse_name($user.'@'
4139: .$contentpwd);
4140: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
4141: my $krbserver = &Authen::Krb5::parse_name($krbservice);
4142: my $credentials= &Authen::Krb5::cc_default();
4143: $credentials->initialize($krbclient);
4144: my $krbreturn = &Authen::KRb5::get_in_tkt_with_password($krbclient,
4145: $krbserver,
4146: $password,
4147: $credentials);
4148: $validated = ($krbreturn == 1);
4149: } else {
4150: $validated = 0;
4151: }
4152: } elsif ($howpwd eq "localauth") {
4153: # Authenticate via installation specific authentcation method:
4154: $validated = &localauth::localauth($user,
4155: $password,
4156: $contentpwd);
4157: } else { # Unrecognized auth is also bad.
4158: $validated = 0;
4159: }
4160: } else {
4161: $validated = 0;
4162: }
4163: #
4164: # $validated has the correct stat of the authentication:
4165: #
4166:
4167: unless ($validated != -3.14159) {
4168: die "ValidateUser - failed to set the value of validated";
4169: }
4170: return $validated;
4171: }
4172:
4173:
4174: sub addline {
4175: my ($fname,$hostid,$ip,$newline)=@_;
4176: my $contents;
4177: my $found=0;
4178: my $expr='^'.$hostid.':'.$ip.':';
4179: $expr =~ s/\./\\\./g;
4180: my $sh;
4181: if ($sh=IO::File->new("$fname.subscription")) {
4182: while (my $subline=<$sh>) {
4183: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
4184: }
4185: $sh->close();
4186: }
4187: $sh=IO::File->new(">$fname.subscription");
4188: if ($contents) { print $sh $contents; }
4189: if ($newline) { print $sh $newline; }
4190: $sh->close();
4191: return $found;
4192: }
4193:
4194: sub getchat {
4195: my ($cdom,$cname,$udom,$uname)=@_;
4196: my %hash;
4197: my $proname=&propath($cdom,$cname);
4198: my @entries=();
4199: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
4200: &GDBM_READER(),0640)) {
4201: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
4202: untie %hash;
4203: }
4204: my @participants=();
4205: my $cutoff=time-60;
4206: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
4207: &GDBM_WRCREAT(),0640)) {
4208: $hash{$uname.':'.$udom}=time;
4209: foreach (sort keys %hash) {
4210: if ($hash{$_}>$cutoff) {
4211: $participants[$#participants+1]='active_participant:'.$_;
4212: }
4213: }
4214: untie %hash;
4215: }
4216: return (@participants,@entries);
4217: }
4218:
4219: sub chatadd {
4220: my ($cdom,$cname,$newchat)=@_;
4221: my %hash;
4222: my $proname=&propath($cdom,$cname);
4223: my @entries=();
4224: my $time=time;
4225: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
4226: &GDBM_WRCREAT(),0640)) {
4227: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
4228: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
4229: my ($thentime,$idnum)=split(/\_/,$lastid);
4230: my $newid=$time.'_000000';
4231: if ($thentime==$time) {
4232: $idnum=~s/^0+//;
4233: $idnum++;
4234: $idnum=substr('000000'.$idnum,-6,6);
4235: $newid=$time.'_'.$idnum;
4236: }
4237: $hash{$newid}=$newchat;
4238: my $expired=$time-3600;
4239: foreach (keys %hash) {
4240: my ($thistime)=($_=~/(\d+)\_/);
4241: if ($thistime<$expired) {
4242: delete $hash{$_};
4243: }
4244: }
4245: untie %hash;
4246: }
4247: {
4248: my $hfh;
4249: if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
4250: print $hfh "$time:".&unescape($newchat)."\n";
4251: }
4252: }
4253: }
4254:
4255: sub unsub {
4256: my ($fname,$clientip)=@_;
4257: my $result;
4258: my $unsubs = 0; # Number of successful unsubscribes:
4259:
4260:
4261: # An old way subscriptions were handled was to have a
4262: # subscription marker file:
4263:
4264: Debug("Attempting unlink of $fname.$clientname");
4265: if (unlink("$fname.$clientname")) {
4266: $unsubs++; # Successful unsub via marker file.
4267: }
4268:
4269: # The more modern way to do it is to have a subscription list
4270: # file:
4271:
4272: if (-e "$fname.subscription") {
4273: my $found=&addline($fname,$clientname,$clientip,'');
4274: if ($found) {
4275: $unsubs++;
4276: }
4277: }
4278:
4279: # If either or both of these mechanisms succeeded in unsubscribing a
4280: # resource we can return ok:
4281:
4282: if($unsubs) {
4283: $result = "ok\n";
4284: } else {
4285: $result = "not_subscribed\n";
4286: }
4287:
4288: return $result;
4289: }
4290:
4291: sub currentversion {
4292: my $fname=shift;
4293: my $version=-1;
4294: my $ulsdir='';
4295: if ($fname=~/^(.+)\/[^\/]+$/) {
4296: $ulsdir=$1;
4297: }
4298: my ($fnamere1,$fnamere2);
4299: # remove version if already specified
4300: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
4301: # get the bits that go before and after the version number
4302: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
4303: $fnamere1=$1;
4304: $fnamere2='.'.$2;
4305: }
4306: if (-e $fname) { $version=1; }
4307: if (-e $ulsdir) {
4308: if(-d $ulsdir) {
4309: if (opendir(LSDIR,$ulsdir)) {
4310: my $ulsfn;
4311: while ($ulsfn=readdir(LSDIR)) {
4312: # see if this is a regular file (ignore links produced earlier)
4313: my $thisfile=$ulsdir.'/'.$ulsfn;
4314: unless (-l $thisfile) {
4315: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
4316: if ($1>$version) { $version=$1; }
4317: }
4318: }
4319: }
4320: closedir(LSDIR);
4321: $version++;
4322: }
4323: }
4324: }
4325: return $version;
4326: }
4327:
4328: sub thisversion {
4329: my $fname=shift;
4330: my $version=-1;
4331: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
4332: $version=$1;
4333: }
4334: return $version;
4335: }
4336:
4337: sub subscribe {
4338: my ($userinput,$clientip)=@_;
4339: my $result;
4340: my ($cmd,$fname)=split(/:/,$userinput);
4341: my $ownership=&ishome($fname);
4342: if ($ownership eq 'owner') {
4343: # explitly asking for the current version?
4344: unless (-e $fname) {
4345: my $currentversion=¤tversion($fname);
4346: if (&thisversion($fname)==$currentversion) {
4347: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
4348: my $root=$1;
4349: my $extension=$2;
4350: symlink($root.'.'.$extension,
4351: $root.'.'.$currentversion.'.'.$extension);
4352: unless ($extension=~/\.meta$/) {
4353: symlink($root.'.'.$extension.'.meta',
4354: $root.'.'.$currentversion.'.'.$extension.'.meta');
4355: }
4356: }
4357: }
4358: }
4359: if (-e $fname) {
4360: if (-d $fname) {
4361: $result="directory\n";
4362: } else {
4363: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
4364: my $now=time;
4365: my $found=&addline($fname,$clientname,$clientip,
4366: "$clientname:$clientip:$now\n");
4367: if ($found) { $result="$fname\n"; }
4368: # if they were subscribed to only meta data, delete that
4369: # subscription, when you subscribe to a file you also get
4370: # the metadata
4371: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
4372: $fname=~s/\/home\/httpd\/html\/res/raw/;
4373: $fname="http://$thisserver/".$fname;
4374: $result="$fname\n";
4375: }
4376: } else {
4377: $result="not_found\n";
4378: }
4379: } else {
4380: $result="rejected\n";
4381: }
4382: return $result;
4383: }
4384:
4385: sub make_passwd_file {
4386: my ($uname, $umode,$npass,$passfilename)=@_;
4387: my $result="ok\n";
4388: if ($umode eq 'krb4' or $umode eq 'krb5') {
4389: {
4390: my $pf = IO::File->new(">$passfilename");
4391: print $pf "$umode:$npass\n";
4392: }
4393: } elsif ($umode eq 'internal') {
4394: my $salt=time;
4395: $salt=substr($salt,6,2);
4396: my $ncpass=crypt($npass,$salt);
4397: {
4398: &Debug("Creating internal auth");
4399: my $pf = IO::File->new(">$passfilename");
4400: print $pf "internal:$ncpass\n";
4401: }
4402: } elsif ($umode eq 'localauth') {
4403: {
4404: my $pf = IO::File->new(">$passfilename");
4405: print $pf "localauth:$npass\n";
4406: }
4407: } elsif ($umode eq 'unix') {
4408: {
4409: #
4410: # Don't allow the creation of privileged accounts!!! that would
4411: # be real bad!!!
4412: #
4413: my $uid = getpwnam($uname);
4414: if((defined $uid) && ($uid == 0)) {
4415: &logthis(">>>Attempted to create privilged account blocked");
4416: return "no_priv_account_error\n";
4417: }
4418:
4419: my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd";
4420:
4421: my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status";
4422: {
4423: &Debug("Executing external: ".$execpath);
4424: &Debug("user = ".$uname.", Password =". $npass);
4425: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
4426: print $se "$uname\n";
4427: print $se "$npass\n";
4428: print $se "$npass\n";
4429: print $se "$lc_error_file\n"; # Status -> unique file.
4430: }
4431: my $error = IO::File->new("< $lc_error_file");
4432: my $useraddok = <$error>;
4433: $error->close;
4434: unlink($lc_error_file);
4435:
4436: chomp $useraddok;
4437:
4438: if($useraddok > 0) {
4439: my $error_text = &lcuseraddstrerror($useraddok);
4440: &logthis("Failed lcuseradd: $error_text");
4441: $result = "lcuseradd_failed:$error_text\n";
4442: } else {
4443: my $pf = IO::File->new(">$passfilename");
4444: print $pf "unix:\n";
4445: }
4446: }
4447: } elsif ($umode eq 'none') {
4448: {
4449: my $pf = IO::File->new("> $passfilename");
4450: print $pf "none:\n";
4451: }
4452: } else {
4453: $result="auth_mode_error\n";
4454: }
4455: return $result;
4456: }
4457:
4458: sub sethost {
4459: my ($remotereq) = @_;
4460: my (undef,$hostid)=split(/:/,$remotereq);
4461: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
4462: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
4463: $currenthostid =$hostid;
4464: $currentdomainid=$hostdom{$hostid};
4465: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
4466: } else {
4467: &logthis("Requested host id $hostid not an alias of ".
4468: $perlvar{'lonHostID'}." refusing connection");
4469: return 'unable_to_set';
4470: }
4471: return 'ok';
4472: }
4473:
4474: sub version {
4475: my ($userinput)=@_;
4476: $remoteVERSION=(split(/:/,$userinput))[1];
4477: return "version:$VERSION";
4478: }
4479:
4480: #There is a copy of this in lonnet.pm
4481: sub userload {
4482: my $numusers=0;
4483: {
4484: opendir(LONIDS,$perlvar{'lonIDsDir'});
4485: my $filename;
4486: my $curtime=time;
4487: while ($filename=readdir(LONIDS)) {
4488: if ($filename eq '.' || $filename eq '..') {next;}
4489: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
4490: if ($curtime-$mtime < 1800) { $numusers++; }
4491: }
4492: closedir(LONIDS);
4493: }
4494: my $userloadpercent=0;
4495: my $maxuserload=$perlvar{'lonUserLoadLim'};
4496: if ($maxuserload) {
4497: $userloadpercent=100*$numusers/$maxuserload;
4498: }
4499: $userloadpercent=sprintf("%.2f",$userloadpercent);
4500: return $userloadpercent;
4501: }
4502:
4503: # Routines for serializing arrays and hashes (copies from lonnet)
4504:
4505: sub array2str {
4506: my (@array) = @_;
4507: my $result=&arrayref2str(\@array);
4508: $result=~s/^__ARRAY_REF__//;
4509: $result=~s/__END_ARRAY_REF__$//;
4510: return $result;
4511: }
4512:
4513: sub arrayref2str {
4514: my ($arrayref) = @_;
4515: my $result='__ARRAY_REF__';
4516: foreach my $elem (@$arrayref) {
4517: if(ref($elem) eq 'ARRAY') {
4518: $result.=&arrayref2str($elem).'&';
4519: } elsif(ref($elem) eq 'HASH') {
4520: $result.=&hashref2str($elem).'&';
4521: } elsif(ref($elem)) {
4522: #print("Got a ref of ".(ref($elem))." skipping.");
4523: } else {
4524: $result.=&escape($elem).'&';
4525: }
4526: }
4527: $result=~s/\&$//;
4528: $result .= '__END_ARRAY_REF__';
4529: return $result;
4530: }
4531:
4532: sub hash2str {
4533: my (%hash) = @_;
4534: my $result=&hashref2str(\%hash);
4535: $result=~s/^__HASH_REF__//;
4536: $result=~s/__END_HASH_REF__$//;
4537: return $result;
4538: }
4539:
4540: sub hashref2str {
4541: my ($hashref)=@_;
4542: my $result='__HASH_REF__';
4543: foreach (sort(keys(%$hashref))) {
4544: if (ref($_) eq 'ARRAY') {
4545: $result.=&arrayref2str($_).'=';
4546: } elsif (ref($_) eq 'HASH') {
4547: $result.=&hashref2str($_).'=';
4548: } elsif (ref($_)) {
4549: $result.='=';
4550: #print("Got a ref of ".(ref($_))." skipping.");
4551: } else {
4552: if ($_) {$result.=&escape($_).'=';} else { last; }
4553: }
4554:
4555: if(ref($hashref->{$_}) eq 'ARRAY') {
4556: $result.=&arrayref2str($hashref->{$_}).'&';
4557: } elsif(ref($hashref->{$_}) eq 'HASH') {
4558: $result.=&hashref2str($hashref->{$_}).'&';
4559: } elsif(ref($hashref->{$_})) {
4560: $result.='&';
4561: #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
4562: } else {
4563: $result.=&escape($hashref->{$_}).'&';
4564: }
4565: }
4566: $result=~s/\&$//;
4567: $result .= '__END_HASH_REF__';
4568: return $result;
4569: }
4570:
4571: # ----------------------------------- POD (plain old documentation, CPAN style)
4572:
4573: =head1 NAME
4574:
4575: lond - "LON Daemon" Server (port "LOND" 5663)
4576:
4577: =head1 SYNOPSIS
4578:
4579: Usage: B<lond>
4580:
4581: Should only be run as user=www. This is a command-line script which
4582: is invoked by B<loncron>. There is no expectation that a typical user
4583: will manually start B<lond> from the command-line. (In other words,
4584: DO NOT START B<lond> YOURSELF.)
4585:
4586: =head1 DESCRIPTION
4587:
4588: There are two characteristics associated with the running of B<lond>,
4589: PROCESS MANAGEMENT (starting, stopping, handling child processes)
4590: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
4591: subscriptions, etc). These are described in two large
4592: sections below.
4593:
4594: B<PROCESS MANAGEMENT>
4595:
4596: Preforker - server who forks first. Runs as a daemon. HUPs.
4597: Uses IDEA encryption
4598:
4599: B<lond> forks off children processes that correspond to the other servers
4600: in the network. Management of these processes can be done at the
4601: parent process level or the child process level.
4602:
4603: B<logs/lond.log> is the location of log messages.
4604:
4605: The process management is now explained in terms of linux shell commands,
4606: subroutines internal to this code, and signal assignments:
4607:
4608: =over 4
4609:
4610: =item *
4611:
4612: PID is stored in B<logs/lond.pid>
4613:
4614: This is the process id number of the parent B<lond> process.
4615:
4616: =item *
4617:
4618: SIGTERM and SIGINT
4619:
4620: Parent signal assignment:
4621: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
4622:
4623: Child signal assignment:
4624: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
4625: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
4626: to restart a new child.)
4627:
4628: Command-line invocations:
4629: B<kill> B<-s> SIGTERM I<PID>
4630: B<kill> B<-s> SIGINT I<PID>
4631:
4632: Subroutine B<HUNTSMAN>:
4633: This is only invoked for the B<lond> parent I<PID>.
4634: This kills all the children, and then the parent.
4635: The B<lonc.pid> file is cleared.
4636:
4637: =item *
4638:
4639: SIGHUP
4640:
4641: Current bug:
4642: This signal can only be processed the first time
4643: on the parent process. Subsequent SIGHUP signals
4644: have no effect.
4645:
4646: Parent signal assignment:
4647: $SIG{HUP} = \&HUPSMAN;
4648:
4649: Child signal assignment:
4650: none (nothing happens)
4651:
4652: Command-line invocations:
4653: B<kill> B<-s> SIGHUP I<PID>
4654:
4655: Subroutine B<HUPSMAN>:
4656: This is only invoked for the B<lond> parent I<PID>,
4657: This kills all the children, and then the parent.
4658: The B<lond.pid> file is cleared.
4659:
4660: =item *
4661:
4662: SIGUSR1
4663:
4664: Parent signal assignment:
4665: $SIG{USR1} = \&USRMAN;
4666:
4667: Child signal assignment:
4668: $SIG{USR1}= \&logstatus;
4669:
4670: Command-line invocations:
4671: B<kill> B<-s> SIGUSR1 I<PID>
4672:
4673: Subroutine B<USRMAN>:
4674: When invoked for the B<lond> parent I<PID>,
4675: SIGUSR1 is sent to all the children, and the status of
4676: each connection is logged.
4677:
4678: =item *
4679:
4680: SIGUSR2
4681:
4682: Parent Signal assignment:
4683: $SIG{USR2} = \&UpdateHosts
4684:
4685: Child signal assignment:
4686: NONE
4687:
4688:
4689: =item *
4690:
4691: SIGCHLD
4692:
4693: Parent signal assignment:
4694: $SIG{CHLD} = \&REAPER;
4695:
4696: Child signal assignment:
4697: none
4698:
4699: Command-line invocations:
4700: B<kill> B<-s> SIGCHLD I<PID>
4701:
4702: Subroutine B<REAPER>:
4703: This is only invoked for the B<lond> parent I<PID>.
4704: Information pertaining to the child is removed.
4705: The socket port is cleaned up.
4706:
4707: =back
4708:
4709: B<SERVER-SIDE ACTIVITIES>
4710:
4711: Server-side information can be accepted in an encrypted or non-encrypted
4712: method.
4713:
4714: =over 4
4715:
4716: =item ping
4717:
4718: Query a client in the hosts.tab table; "Are you there?"
4719:
4720: =item pong
4721:
4722: Respond to a ping query.
4723:
4724: =item ekey
4725:
4726: Read in encrypted key, make cipher. Respond with a buildkey.
4727:
4728: =item load
4729:
4730: Respond with CPU load based on a computation upon /proc/loadavg.
4731:
4732: =item currentauth
4733:
4734: Reply with current authentication information (only over an
4735: encrypted channel).
4736:
4737: =item auth
4738:
4739: Only over an encrypted channel, reply as to whether a user's
4740: authentication information can be validated.
4741:
4742: =item passwd
4743:
4744: Allow for a password to be set.
4745:
4746: =item makeuser
4747:
4748: Make a user.
4749:
4750: =item passwd
4751:
4752: Allow for authentication mechanism and password to be changed.
4753:
4754: =item home
4755:
4756: Respond to a question "are you the home for a given user?"
4757:
4758: =item update
4759:
4760: Update contents of a subscribed resource.
4761:
4762: =item unsubscribe
4763:
4764: The server is unsubscribing from a resource.
4765:
4766: =item subscribe
4767:
4768: The server is subscribing to a resource.
4769:
4770: =item log
4771:
4772: Place in B<logs/lond.log>
4773:
4774: =item put
4775:
4776: stores hash in namespace
4777:
4778: =item rolesput
4779:
4780: put a role into a user's environment
4781:
4782: =item get
4783:
4784: returns hash with keys from array
4785: reference filled in from namespace
4786:
4787: =item eget
4788:
4789: returns hash with keys from array
4790: reference filled in from namesp (encrypts the return communication)
4791:
4792: =item rolesget
4793:
4794: get a role from a user's environment
4795:
4796: =item del
4797:
4798: deletes keys out of array from namespace
4799:
4800: =item keys
4801:
4802: returns namespace keys
4803:
4804: =item dump
4805:
4806: dumps the complete (or key matching regexp) namespace into a hash
4807:
4808: =item store
4809:
4810: stores hash permanently
4811: for this url; hashref needs to be given and should be a \%hashname; the
4812: remaining args aren't required and if they aren't passed or are '' they will
4813: be derived from the ENV
4814:
4815: =item restore
4816:
4817: returns a hash for a given url
4818:
4819: =item querysend
4820:
4821: Tells client about the lonsql process that has been launched in response
4822: to a sent query.
4823:
4824: =item queryreply
4825:
4826: Accept information from lonsql and make appropriate storage in temporary
4827: file space.
4828:
4829: =item idput
4830:
4831: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
4832: for each student, defined perhaps by the institutional Registrar.)
4833:
4834: =item idget
4835:
4836: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
4837: for each student, defined perhaps by the institutional Registrar.)
4838:
4839: =item tmpput
4840:
4841: Accept and store information in temporary space.
4842:
4843: =item tmpget
4844:
4845: Send along temporarily stored information.
4846:
4847: =item ls
4848:
4849: List part of a user's directory.
4850:
4851: =item pushtable
4852:
4853: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
4854: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
4855: must be restored manually in case of a problem with the new table file.
4856: pushtable requires that the request be encrypted and validated via
4857: ValidateManager. The form of the command is:
4858: enc:pushtable tablename <tablecontents> \n
4859: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
4860: cleartext newline.
4861:
4862: =item Hanging up (exit or init)
4863:
4864: What to do when a client tells the server that they (the client)
4865: are leaving the network.
4866:
4867: =item unknown command
4868:
4869: If B<lond> is sent an unknown command (not in the list above),
4870: it replys to the client "unknown_cmd".
4871:
4872:
4873: =item UNKNOWN CLIENT
4874:
4875: If the anti-spoofing algorithm cannot verify the client,
4876: the client is rejected (with a "refused" message sent
4877: to the client, and the connection is closed.
4878:
4879: =back
4880:
4881: =head1 PREREQUISITES
4882:
4883: IO::Socket
4884: IO::File
4885: Apache::File
4886: Symbol
4887: POSIX
4888: Crypt::IDEA
4889: LWP::UserAgent()
4890: GDBM_File
4891: Authen::Krb4
4892: Authen::Krb5
4893:
4894: =head1 COREQUISITES
4895:
4896: =head1 OSNAMES
4897:
4898: linux
4899:
4900: =head1 SCRIPT CATEGORIES
4901:
4902: Server/Process
4903:
4904: =cut
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