1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.231 2004/08/17 10:44:00 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: 1.231 $'; #' 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: #
1878: # Unsubscribe from a resource.
1879: #
1880: # Parameters:
1881: # $cmd - The command that got us here.
1882: # $tail - Tail of the command (remaining parameters).
1883: # $client - File descriptor connected to client.
1884: # Returns
1885: # 0 - Requested to exit, caller should shut down.
1886: # 1 - Continue processing.
1887: #
1888: sub unsubscribe_handler {
1889: my ($cmd, $tail, $client) = @_;
1890:
1891: my $userinput= "$cmd:$tail";
1892:
1893: my ($fname) = split(/:/,$tail); # Split in case there's extrs.
1894:
1895: &Debug("Unsubscribing $fname");
1896: if (-e $fname) {
1897: &Debug("Exists");
1898: &Reply($client, &unsub($fname,$clientip), $userinput);
1899: } else {
1900: &Failure($client, "not_found\n", $userinput);
1901: }
1902: return 1;
1903: }
1904: ®ister_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
1905: # Subscribe to a resource
1906: #
1907: # Parameters:
1908: # $cmd - The command that got us here.
1909: # $tail - Tail of the command (remaining parameters).
1910: # $client - File descriptor connected to client.
1911: # Returns
1912: # 0 - Requested to exit, caller should shut down.
1913: # 1 - Continue processing.
1914: #
1915: sub subscribe_handler {
1916: my ($cmd, $tail, $client)= @_;
1917:
1918: my $userinput = "$cmd:$tail";
1919:
1920: &Reply( $client, &subscribe($userinput,$clientip), $userinput);
1921:
1922: return 1;
1923: }
1924: ®ister_handler("sub", \&subscribe_handler, 0, 1, 0);
1925:
1926: #
1927: # Determine the version of a resource (?) Or is it return
1928: # the top version of the resource? Not yet clear from the
1929: # code in currentversion.
1930: #
1931: # Parameters:
1932: # $cmd - The command that got us here.
1933: # $tail - Tail of the command (remaining parameters).
1934: # $client - File descriptor connected to client.
1935: # Returns
1936: # 0 - Requested to exit, caller should shut down.
1937: # 1 - Continue processing.
1938: #
1939: sub current_version_handler {
1940: my ($cmd, $tail, $client) = @_;
1941:
1942: my $userinput= "$cmd:$tail";
1943:
1944: my $fname = $tail;
1945: &Reply( $client, ¤tversion($fname)."\n", $userinput);
1946: return 1;
1947:
1948: }
1949: ®ister_handler("currentversion", \¤t_version_handler, 0, 1, 0);
1950:
1951: # Make an entry in a user's activity log.
1952: #
1953: # Parameters:
1954: # $cmd - The command that got us here.
1955: # $tail - Tail of the command (remaining parameters).
1956: # $client - File descriptor connected to client.
1957: # Returns
1958: # 0 - Requested to exit, caller should shut down.
1959: # 1 - Continue processing.
1960: #
1961: sub activity_log_handler {
1962: my ($cmd, $tail, $client) = @_;
1963:
1964:
1965: my $userinput= "$cmd:$tail";
1966:
1967: my ($udom,$uname,$what)=split(/:/,$tail);
1968: chomp($what);
1969: my $proname=&propath($udom,$uname);
1970: my $now=time;
1971: my $hfh;
1972: if ($hfh=IO::File->new(">>$proname/activity.log")) {
1973: print $hfh "$now:$clientname:$what\n";
1974: &Reply( $client, "ok\n", $userinput);
1975: } else {
1976: &Failure($client, "error: ".($!+0)." IO::File->new Failed "
1977: ."while attempting log\n",
1978: $userinput);
1979: }
1980:
1981: return 1;
1982: }
1983: register_handler("log", \&activity_log_handler, 0, 1, 0);
1984:
1985: #
1986: # Put a namespace entry in a user profile hash.
1987: # My druthers would be for this to be an encrypted interaction too.
1988: # anything that might be an inadvertent covert channel about either
1989: # user authentication or user personal information....
1990: #
1991: # Parameters:
1992: # $cmd - The command that got us here.
1993: # $tail - Tail of the command (remaining parameters).
1994: # $client - File descriptor connected to client.
1995: # Returns
1996: # 0 - Requested to exit, caller should shut down.
1997: # 1 - Continue processing.
1998: #
1999: sub put_user_profile_entry {
2000: my ($cmd, $tail, $client) = @_;
2001:
2002: my $userinput = "$cmd:$tail";
2003:
2004: my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
2005: if ($namespace ne 'roles') {
2006: chomp($what);
2007: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2008: &GDBM_WRCREAT(),"P",$what);
2009: if($hashref) {
2010: my @pairs=split(/\&/,$what);
2011: foreach my $pair (@pairs) {
2012: my ($key,$value)=split(/=/,$pair);
2013: $hashref->{$key}=$value;
2014: }
2015: if (untie(%$hashref)) {
2016: &Reply( $client, "ok\n", $userinput);
2017: } else {
2018: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2019: "while attempting put\n",
2020: $userinput);
2021: }
2022: } else {
2023: &Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
2024: "while attempting put\n", $userinput);
2025: }
2026: } else {
2027: &Failure( $client, "refused\n", $userinput);
2028: }
2029:
2030: return 1;
2031: }
2032: ®ister_handler("put", \&put_user_profile_entry, 0, 1, 0);
2033:
2034: #
2035: # Increment a profile entry in the user history file.
2036: # The history contains keyword value pairs. In this case,
2037: # The value itself is a pair of numbers. The first, the current value
2038: # the second an increment that this function applies to the current
2039: # value.
2040: #
2041: # Parameters:
2042: # $cmd - The command that got us here.
2043: # $tail - Tail of the command (remaining parameters).
2044: # $client - File descriptor connected to client.
2045: # Returns
2046: # 0 - Requested to exit, caller should shut down.
2047: # 1 - Continue processing.
2048: #
2049: sub increment_user_value_handler {
2050: my ($cmd, $tail, $client) = @_;
2051:
2052: my $userinput = "$cmd:$tail";
2053:
2054: my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
2055: if ($namespace ne 'roles') {
2056: chomp($what);
2057: my $hashref = &tie_user_hash($udom, $uname,
2058: $namespace, &GDBM_WRCREAT(),
2059: "P",$what);
2060: if ($hashref) {
2061: my @pairs=split(/\&/,$what);
2062: foreach my $pair (@pairs) {
2063: my ($key,$value)=split(/=/,$pair);
2064: # We could check that we have a number...
2065: if (! defined($value) || $value eq '') {
2066: $value = 1;
2067: }
2068: $hashref->{$key}+=$value;
2069: }
2070: if (untie(%$hashref)) {
2071: &Reply( $client, "ok\n", $userinput);
2072: } else {
2073: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2074: "while attempting inc\n", $userinput);
2075: }
2076: } else {
2077: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2078: "while attempting inc\n", $userinput);
2079: }
2080: } else {
2081: &Failure($client, "refused\n", $userinput);
2082: }
2083:
2084: return 1;
2085: }
2086: ®ister_handler("inc", \&increment_user_value_handler, 0, 1, 0);
2087:
2088:
2089: #
2090: # Put a new role for a user. Roles are LonCAPA's packaging of permissions.
2091: # Each 'role' a user has implies a set of permissions. Adding a new role
2092: # for a person grants the permissions packaged with that role
2093: # to that user when the role is selected.
2094: #
2095: # Parameters:
2096: # $cmd - The command string (rolesput).
2097: # $tail - The remainder of the request line. For rolesput this
2098: # consists of a colon separated list that contains:
2099: # The domain and user that is granting the role (logged).
2100: # The domain and user that is getting the role.
2101: # The roles being granted as a set of & separated pairs.
2102: # each pair a key value pair.
2103: # $client - File descriptor connected to the client.
2104: # Returns:
2105: # 0 - If the daemon should exit
2106: # 1 - To continue processing.
2107: #
2108: #
2109: sub roles_put_handler {
2110: my ($cmd, $tail, $client) = @_;
2111:
2112: my $userinput = "$cmd:$tail";
2113:
2114: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail);
2115:
2116:
2117: my $namespace='roles';
2118: chomp($what);
2119: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2120: &GDBM_WRCREAT(), "P",
2121: "$exedom:$exeuser:$what");
2122: #
2123: # Log the attempt to set a role. The {}'s here ensure that the file
2124: # handle is open for the minimal amount of time. Since the flush
2125: # is done on close this improves the chances the log will be an un-
2126: # corrupted ordered thing.
2127: if ($hashref) {
2128: my @pairs=split(/\&/,$what);
2129: foreach my $pair (@pairs) {
2130: my ($key,$value)=split(/=/,$pair);
2131: &manage_permissions($key, $udom, $uname,
2132: &get_auth_type( $udom, $uname));
2133: $hashref->{$key}=$value;
2134: }
2135: if (untie($hashref)) {
2136: &Reply($client, "ok\n", $userinput);
2137: } else {
2138: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2139: "while attempting rolesput\n", $userinput);
2140: }
2141: } else {
2142: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2143: "while attempting rolesput\n", $userinput);
2144: }
2145: return 1;
2146: }
2147: ®ister_handler("rolesput", \&roles_put_handler, 1,1,0); # Encoded client only.
2148:
2149: #
2150: # Deletes (removes) a role for a user. This is equivalent to removing
2151: # a permissions package associated with the role from the user's profile.
2152: #
2153: # Parameters:
2154: # $cmd - The command (rolesdel)
2155: # $tail - The remainder of the request line. This consists
2156: # of:
2157: # The domain and user requesting the change (logged)
2158: # The domain and user being changed.
2159: # The roles being revoked. These are shipped to us
2160: # as a bunch of & separated role name keywords.
2161: # $client - The file handle open on the client.
2162: # Returns:
2163: # 1 - Continue processing
2164: # 0 - Exit.
2165: #
2166: sub roles_delete_handler {
2167: my ($cmd, $tail, $client) = @_;
2168:
2169: my $userinput = "$cmd:$tail";
2170:
2171: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
2172: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
2173: "what = ".$what);
2174: my $namespace='roles';
2175: chomp($what);
2176: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2177: &GDBM_WRCREAT(), "D",
2178: "$exedom:$exeuser:$what");
2179:
2180: if ($hashref) {
2181: my @rolekeys=split(/\&/,$what);
2182:
2183: foreach my $key (@rolekeys) {
2184: delete $hashref->{$key};
2185: }
2186: if (untie(%$hashref)) {
2187: &Reply($client, "ok\n", $userinput);
2188: } else {
2189: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2190: "while attempting rolesdel\n", $userinput);
2191: }
2192: } else {
2193: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2194: "while attempting rolesdel\n", $userinput);
2195: }
2196:
2197: return 1;
2198: }
2199: ®ister_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
2200:
2201: # Unencrypted get from a user's profile database. See
2202: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
2203: # This function retrieves a keyed item from a specific named database in the
2204: # user's directory.
2205: #
2206: # Parameters:
2207: # $cmd - Command request keyword (get).
2208: # $tail - Tail of the command. This is a colon separated list
2209: # consisting of the domain and username that uniquely
2210: # identifies the profile,
2211: # The 'namespace' which selects the gdbm file to
2212: # do the lookup in,
2213: # & separated list of keys to lookup. Note that
2214: # the values are returned as an & separated list too.
2215: # $client - File descriptor open on the client.
2216: # Returns:
2217: # 1 - Continue processing.
2218: # 0 - Exit.
2219: #
2220: sub get_profile_entry {
2221: my ($cmd, $tail, $client) = @_;
2222:
2223: my $userinput= "$cmd:$tail";
2224:
2225: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2226: chomp($what);
2227: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2228: &GDBM_READER());
2229: if ($hashref) {
2230: my @queries=split(/\&/,$what);
2231: my $qresult='';
2232:
2233: for (my $i=0;$i<=$#queries;$i++) {
2234: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string.
2235: }
2236: $qresult=~s/\&$//; # Remove trailing & from last lookup.
2237: if (untie(%$hashref)) {
2238: &Reply($client, "$qresult\n", $userinput);
2239: } else {
2240: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2241: "while attempting get\n", $userinput);
2242: }
2243: } else {
2244: if ($!+0 == 2) { # +0 coerces errno -> number 2 is ENOENT
2245: &Failure($client, "error:No such file or ".
2246: "GDBM reported bad block error\n", $userinput);
2247: } else { # Some other undifferentiated err.
2248: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2249: "while attempting get\n", $userinput);
2250: }
2251: }
2252: return 1;
2253: }
2254: ®ister_handler("get", \&get_profile_entry, 0,1,0);
2255:
2256: #
2257: # Process the encrypted get request. Note that the request is sent
2258: # in clear, but the reply is encrypted. This is a small covert channel:
2259: # information about the sensitive keys is given to the snooper. Just not
2260: # information about the values of the sensitive key. Hmm if I wanted to
2261: # know these I'd snoop for the egets. Get the profile item names from them
2262: # and then issue a get for them since there's no enforcement of the
2263: # requirement of an encrypted get for particular profile items. If I
2264: # were re-doing this, I'd force the request to be encrypted as well as the
2265: # reply. I'd also just enforce encrypted transactions for all gets since
2266: # that would prevent any covert channel snooping.
2267: #
2268: # Parameters:
2269: # $cmd - Command keyword of request (eget).
2270: # $tail - Tail of the command. See GetProfileEntry
# for more information about this.
2271: # $client - File open on the client.
2272: # Returns:
2273: # 1 - Continue processing
2274: # 0 - server should exit.
2275: sub get_profile_entry_encrypted {
2276: my ($cmd, $tail, $client) = @_;
2277:
2278: my $userinput = "$cmd:$tail";
2279:
2280: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
2281: chomp($what);
2282: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2283: &GDBM_READER());
2284: if ($hashref) {
2285: my @queries=split(/\&/,$what);
2286: my $qresult='';
2287: for (my $i=0;$i<=$#queries;$i++) {
2288: $qresult.="$hashref->{$queries[$i]}&";
2289: }
2290: if (untie(%$hashref)) {
2291: $qresult=~s/\&$//;
2292: if ($cipher) {
2293: my $cmdlength=length($qresult);
2294: $qresult.=" ";
2295: my $encqresult='';
2296: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
2297: $encqresult.= unpack("H16",
2298: $cipher->encrypt(substr($qresult,
2299: $encidx,
2300: 8)));
2301: }
2302: &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
2303: } else {
2304: &Failure( $client, "error:no_key\n", $userinput);
2305: }
2306: } else {
2307: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2308: "while attempting eget\n", $userinput);
2309: }
2310: } else {
2311: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2312: "while attempting eget\n", $userinput);
2313: }
2314:
2315: return 1;
2316: }
2317: ®ister_handler("eget", \&GetProfileEntryEncrypted, 0, 1, 0);
2318: #
2319: # Deletes a key in a user profile database.
2320: #
2321: # Parameters:
2322: # $cmd - Command keyword (del).
2323: # $tail - Command tail. IN this case a colon
2324: # separated list containing:
2325: # The domain and user that identifies uniquely
2326: # the identity of the user.
2327: # The profile namespace (name of the profile
2328: # database file).
2329: # & separated list of keywords to delete.
2330: # $client - File open on client socket.
2331: # Returns:
2332: # 1 - Continue processing
2333: # 0 - Exit server.
2334: #
2335: #
2336:
2337: sub delete_profile_entry {
2338: my ($cmd, $tail, $client) = @_;
2339:
2340: my $userinput = "cmd:$tail";
2341:
2342: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2343: chomp($what);
2344: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2345: &GDBM_WRCREAT(),
2346: "D",$what);
2347: if ($hashref) {
2348: my @keys=split(/\&/,$what);
2349: foreach my $key (@keys) {
2350: delete($hashref->{$key});
2351: }
2352: if (untie(%$hashref)) {
2353: &Reply($client, "ok\n", $userinput);
2354: } else {
2355: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2356: "while attempting del\n", $userinput);
2357: }
2358: } else {
2359: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2360: "while attempting del\n", $userinput);
2361: }
2362: return 1;
2363: }
2364: ®ister_handler("del", \&delete_profile_entry, 0, 1, 0);
2365: #
2366: # List the set of keys that are defined in a profile database file.
2367: # A successful reply from this will contain an & separated list of
2368: # the keys.
2369: # Parameters:
2370: # $cmd - Command request (keys).
2371: # $tail - Remainder of the request, a colon separated
2372: # list containing domain/user that identifies the
2373: # user being queried, and the database namespace
2374: # (database filename essentially).
2375: # $client - File open on the client.
2376: # Returns:
2377: # 1 - Continue processing.
2378: # 0 - Exit the server.
2379: #
2380: sub get_profile_keys {
2381: my ($cmd, $tail, $client) = @_;
2382:
2383: my $userinput = "$cmd:$tail";
2384:
2385: my ($udom,$uname,$namespace)=split(/:/,$tail);
2386: my $qresult='';
2387: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2388: &GDBM_READER());
2389: if ($hashref) {
2390: foreach my $key (keys %$hashref) {
2391: $qresult.="$key&";
2392: }
2393: if (untie(%$hashref)) {
2394: $qresult=~s/\&$//;
2395: &Reply($client, "$qresult\n", $userinput);
2396: } else {
2397: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2398: "while attempting keys\n", $userinput);
2399: }
2400: } else {
2401: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2402: "while attempting keys\n", $userinput);
2403: }
2404:
2405: return 1;
2406: }
2407: ®ister_handler("keys", \&get_profile_keys, 0, 1, 0);
2408:
2409: #
2410: # Dump the contents of a user profile database.
2411: # Note that this constitutes a very large covert channel too since
2412: # the dump will return sensitive information that is not encrypted.
2413: # The naive security assumption is that the session negotiation ensures
2414: # our client is trusted and I don't believe that's assured at present.
2415: # Sure want badly to go to ssl or tls. Of course if my peer isn't really
2416: # a LonCAPA node they could have negotiated an encryption key too so >sigh<.
2417: #
2418: # Parameters:
2419: # $cmd - The command request keyword (currentdump).
2420: # $tail - Remainder of the request, consisting of a colon
2421: # separated list that has the domain/username and
2422: # the namespace to dump (database file).
2423: # $client - file open on the remote client.
2424: # Returns:
2425: # 1 - Continue processing.
2426: # 0 - Exit the server.
2427: #
2428: sub dump_profile_database {
2429: my ($cmd, $tail, $client) = @_;
2430:
2431: my $userinput = "$cmd:$tail";
2432:
2433: my ($udom,$uname,$namespace) = split(/:/,$tail);
2434: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2435: &GDBM_READER());
2436: if ($hashref) {
2437: # Structure of %data:
2438: # $data{$symb}->{$parameter}=$value;
2439: # $data{$symb}->{'v.'.$parameter}=$version;
2440: # since $parameter will be unescaped, we do not
2441: # have to worry about silly parameter names...
2442:
2443: my $qresult='';
2444: my %data = (); # A hash of anonymous hashes..
2445: while (my ($key,$value) = each(%$hashref)) {
2446: my ($v,$symb,$param) = split(/:/,$key);
2447: next if ($v eq 'version' || $symb eq 'keys');
2448: next if (exists($data{$symb}) &&
2449: exists($data{$symb}->{$param}) &&
2450: $data{$symb}->{'v.'.$param} > $v);
2451: $data{$symb}->{$param}=$value;
2452: $data{$symb}->{'v.'.$param}=$v;
2453: }
2454: if (untie(%$hashref)) {
2455: while (my ($symb,$param_hash) = each(%data)) {
2456: while(my ($param,$value) = each (%$param_hash)){
2457: next if ($param =~ /^v\./); # Ignore versions...
2458: #
2459: # Just dump the symb=value pairs separated by &
2460: #
2461: $qresult.=$symb.':'.$param.'='.$value.'&';
2462: }
2463: }
2464: chop($qresult);
2465: &Reply($client , "$qresult\n", $userinput);
2466: } else {
2467: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2468: "while attempting currentdump\n", $userinput);
2469: }
2470: } else {
2471: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2472: "while attempting currentdump\n", $userinput);
2473: }
2474:
2475: return 1;
2476: }
2477: ®ister_handler("currentdump", \&dump_profile_database, 0, 1, 0);
2478:
2479: #
2480: # Dump a profile database with an optional regular expression
2481: # to match against the keys. In this dump, no effort is made
2482: # to separate symb from version information. Presumably the
2483: # databases that are dumped by this command are of a different
2484: # structure. Need to look at this and improve the documentation of
2485: # both this and the currentdump handler.
2486: # Parameters:
2487: # $cmd - The command keyword.
2488: # $tail - All of the characters after the $cmd:
2489: # These are expected to be a colon
2490: # separated list containing:
2491: # domain/user - identifying the user.
2492: # namespace - identifying the database.
2493: # regexp - optional regular expression
2494: # that is matched against
2495: # database keywords to do
2496: # selective dumps.
2497: # $client - Channel open on the client.
2498: # Returns:
2499: # 1 - Continue processing.
2500: # Side effects:
2501: # response is written to $client.
2502: #
2503: sub dump_with_regexp {
2504: my ($cmd, $tail, $client) = @_;
2505:
2506:
2507: my $userinput = "$cmd:$tail";
2508:
2509: my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
2510: if (defined($regexp)) {
2511: $regexp=&unescape($regexp);
2512: } else {
2513: $regexp='.';
2514: }
2515: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2516: &GDBM_READER());
2517: if ($hashref) {
2518: my $qresult='';
2519: while (my ($key,$value) = each(%$hashref)) {
2520: if ($regexp eq '.') {
2521: $qresult.=$key.'='.$value.'&';
2522: } else {
2523: my $unescapeKey = &unescape($key);
2524: if (eval('$unescapeKey=~/$regexp/')) {
2525: $qresult.="$key=$value&";
2526: }
2527: }
2528: }
2529: if (untie(%$hashref)) {
2530: chop($qresult);
2531: &Reply($client, "$qresult\n", $userinput);
2532: } else {
2533: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2534: "while attempting dump\n", $userinput);
2535: }
2536: } else {
2537: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2538: "while attempting dump\n", $userinput);
2539: }
2540:
2541: return 1;
2542: }
2543:
2544: ®ister_handler("dump", \&dump_with_regexp, 0, 1, 0);
2545:
2546: # Store a set of key=value pairs associated with a versioned name.
2547: #
2548: # Parameters:
2549: # $cmd - Request command keyword.
2550: # $tail - Tail of the request. This is a colon
2551: # separated list containing:
2552: # domain/user - User and authentication domain.
2553: # namespace - Name of the database being modified
2554: # rid - Resource keyword to modify.
2555: # what - new value associated with rid.
2556: #
2557: # $client - Socket open on the client.
2558: #
2559: #
2560: # Returns:
2561: # 1 (keep on processing).
2562: # Side-Effects:
2563: # Writes to the client
2564: sub store_handler {
2565: my ($cmd, $tail, $client) = @_;
2566:
2567: my $userinput = "$cmd:$tail";
2568:
2569: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
2570: if ($namespace ne 'roles') {
2571:
2572: chomp($what);
2573: my @pairs=split(/\&/,$what);
2574: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2575: &GDBM_WRCREAT(), "P",
2576: "$rid:$what");
2577: if ($hashref) {
2578: my $now = time;
2579: my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
2580: my $key;
2581: $hashref->{"version:$rid"}++;
2582: my $version=$hashref->{"version:$rid"};
2583: my $allkeys='';
2584: foreach my $pair (@pairs) {
2585: my ($key,$value)=split(/=/,$pair);
2586: $allkeys.=$key.':';
2587: $hashref->{"$version:$rid:$key"}=$value;
2588: }
2589: $hashref->{"$version:$rid:timestamp"}=$now;
2590: $allkeys.='timestamp';
2591: $hashref->{"$version:keys:$rid"}=$allkeys;
2592: if (untie($hashref)) {
2593: &Reply($client, "ok\n", $userinput);
2594: } else {
2595: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2596: "while attempting store\n", $userinput);
2597: }
2598: } else {
2599: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2600: "while attempting store\n", $userinput);
2601: }
2602: } else {
2603: &Failure($client, "refused\n", $userinput);
2604: }
2605:
2606: return 1;
2607: }
2608: ®ister_handler("store", \&store_handler, 0, 1, 0);
2609: #
2610: # Dump out all versions of a resource that has key=value pairs associated
2611: # with it for each version. These resources are built up via the store
2612: # command.
2613: #
2614: # Parameters:
2615: # $cmd - Command keyword.
2616: # $tail - Remainder of the request which consists of:
2617: # domain/user - User and auth. domain.
2618: # namespace - name of resource database.
2619: # rid - Resource id.
2620: # $client - socket open on the client.
2621: #
2622: # Returns:
2623: # 1 indicating the caller should not yet exit.
2624: # Side-effects:
2625: # Writes a reply to the client.
2626: # The reply is a string of the following shape:
2627: # version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
2628: # Where the 1 above represents version 1.
2629: # this continues for all pairs of keys in all versions.
2630: #
2631: #
2632: #
2633: #
2634: sub restore_handler {
2635: my ($cmd, $tail, $client) = @_;
2636:
2637: my $userinput = "$cmd:$tail"; # Only used for logging purposes.
2638:
2639: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
2640: $namespace=~s/\//\_/g;
2641: $namespace=~s/\W//g;
2642: chomp($rid);
2643: my $proname=&propath($udom,$uname);
2644: my $qresult='';
2645: my %hash;
2646: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
2647: &GDBM_READER(),0640)) {
2648: my $version=$hash{"version:$rid"};
2649: $qresult.="version=$version&";
2650: my $scope;
2651: for ($scope=1;$scope<=$version;$scope++) {
2652: my $vkeys=$hash{"$scope:keys:$rid"};
2653: my @keys=split(/:/,$vkeys);
2654: my $key;
2655: $qresult.="$scope:keys=$vkeys&";
2656: foreach $key (@keys) {
2657: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
2658: }
2659: }
2660: if (untie(%hash)) {
2661: $qresult=~s/\&$//;
2662: &Reply( $client, "$qresult\n", $userinput);
2663: } else {
2664: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2665: "while attempting restore\n", $userinput);
2666: }
2667: } else {
2668: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2669: "while attempting restore\n", $userinput);
2670: }
2671:
2672: return 1;
2673:
2674:
2675: }
2676: ®ister_handler("restore", \&restore_handler, 0,1,0);
2677: #
2678: #
2679: #---------------------------------------------------------------
2680: #
2681: # Getting, decoding and dispatching requests:
2682: #
2683:
2684: #
2685: # Get a Request:
2686: # Gets a Request message from the client. The transaction
2687: # is defined as a 'line' of text. We remove the new line
2688: # from the text line.
2689: #
2690: sub get_request {
2691: my $input = <$client>;
2692: chomp($input);
2693:
2694: Debug("get_request: Request = $input\n");
2695:
2696: &status('Processing '.$clientname.':'.$input);
2697:
2698: return $input;
2699: }
2700: #---------------------------------------------------------------
2701: #
2702: # Process a request. This sub should shrink as each action
2703: # gets farmed out into a separat sub that is registered
2704: # with the dispatch hash.
2705: #
2706: # Parameters:
2707: # user_input - The request received from the client (lonc).
2708: # Returns:
2709: # true to keep processing, false if caller should exit.
2710: #
2711: sub process_request {
2712: my ($userinput) = @_; # Easier for now to break style than to
2713: # fix all the userinput -> user_input.
2714: my $wasenc = 0; # True if request was encrypted.
2715: # ------------------------------------------------------------ See if encrypted
2716: if ($userinput =~ /^enc/) {
2717: $userinput = decipher($userinput);
2718: $wasenc=1;
2719: if(!$userinput) { # Cipher not defined.
2720: &Failure($client, "error: Encrypted data without negotated key");
2721: return 0;
2722: }
2723: }
2724: Debug("process_request: $userinput\n");
2725:
2726: #
2727: # The 'correct way' to add a command to lond is now to
2728: # write a sub to execute it and Add it to the command dispatch
2729: # hash via a call to register_handler.. The comments to that
2730: # sub should give you enough to go on to show how to do this
2731: # along with the examples that are building up as this code
2732: # is getting refactored. Until all branches of the
2733: # if/elseif monster below have been factored out into
2734: # separate procesor subs, if the dispatch hash is missing
2735: # the command keyword, we will fall through to the remainder
2736: # of the if/else chain below in order to keep this thing in
2737: # working order throughout the transmogrification.
2738:
2739: my ($command, $tail) = split(/:/, $userinput, 2);
2740: chomp($command);
2741: chomp($tail);
2742: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
2743: $command =~ s/(\r)//; # And this too for parameterless commands.
2744: if(!$tail) {
2745: $tail =""; # defined but blank.
2746: }
2747:
2748: &Debug("Command received: $command, encoded = $wasenc");
2749:
2750: if(defined $Dispatcher{$command}) {
2751:
2752: my $dispatch_info = $Dispatcher{$command};
2753: my $handler = $$dispatch_info[0];
2754: my $need_encode = $$dispatch_info[1];
2755: my $client_types = $$dispatch_info[2];
2756: Debug("Matched dispatch hash: mustencode: $need_encode "
2757: ."ClientType $client_types");
2758:
2759: # Validate the request:
2760:
2761: my $ok = 1;
2762: my $requesterprivs = 0;
2763: if(&isClient()) {
2764: $requesterprivs |= $CLIENT_OK;
2765: }
2766: if(&isManager()) {
2767: $requesterprivs |= $MANAGER_OK;
2768: }
2769: if($need_encode && (!$wasenc)) {
2770: Debug("Must encode but wasn't: $need_encode $wasenc");
2771: $ok = 0;
2772: }
2773: if(($client_types & $requesterprivs) == 0) {
2774: Debug("Client not privileged to do this operation");
2775: $ok = 0;
2776: }
2777:
2778: if($ok) {
2779: Debug("Dispatching to handler $command $tail");
2780: my $keep_going = &$handler($command, $tail, $client);
2781: return $keep_going;
2782: } else {
2783: Debug("Refusing to dispatch because client did not match requirements");
2784: Failure($client, "refused\n", $userinput);
2785: return 1;
2786: }
2787:
2788: }
2789:
2790: #------------------- Commands not yet in spearate handlers. --------------
2791:
2792:
2793:
2794: # -------------------------------------------------------------------- chatsend
2795: if ($userinput =~ /^chatsend/) {
2796: if(isClient) {
2797: my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
2798: &chatadd($cdom,$cnum,$newpost);
2799: print $client "ok\n";
2800: } else {
2801: Reply($client, "refused\n", $userinput);
2802:
2803: }
2804: # -------------------------------------------------------------------- chatretr
2805: } elsif ($userinput =~ /^chatretr/) {
2806: if(isClient) {
2807: my
2808: ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
2809: my $reply='';
2810: foreach (&getchat($cdom,$cnum,$udom,$uname)) {
2811: $reply.=&escape($_).':';
2812: }
2813: $reply=~s/\:$//;
2814: print $client $reply."\n";
2815: } else {
2816: Reply($client, "refused\n", $userinput);
2817:
2818: }
2819: # ------------------------------------------------------------------- querysend
2820: } elsif ($userinput =~ /^querysend/) {
2821: if (isClient) {
2822: my ($cmd,$query,
2823: $arg1,$arg2,$arg3)=split(/\:/,$userinput);
2824: $query=~s/\n*$//g;
2825: print $client "".
2826: sqlreply("$clientname\&$query".
2827: "\&$arg1"."\&$arg2"."\&$arg3")."\n";
2828: } else {
2829: Reply($client, "refused\n", $userinput);
2830:
2831: }
2832: # ------------------------------------------------------------------ queryreply
2833: } elsif ($userinput =~ /^queryreply/) {
2834: if(isClient) {
2835: my ($cmd,$id,$reply)=split(/:/,$userinput);
2836: my $store;
2837: my $execdir=$perlvar{'lonDaemons'};
2838: if ($store=IO::File->new(">$execdir/tmp/$id")) {
2839: $reply=~s/\&/\n/g;
2840: print $store $reply;
2841: close $store;
2842: my $store2=IO::File->new(">$execdir/tmp/$id.end");
2843: print $store2 "done\n";
2844: close $store2;
2845: print $client "ok\n";
2846: } else {
2847: print $client "error: ".($!+0)
2848: ." IO::File->new Failed ".
2849: "while attempting queryreply\n";
2850: }
2851: } else {
2852: Reply($client, "refused\n", $userinput);
2853:
2854: }
2855: # ----------------------------------------------------------------- courseidput
2856: } elsif ($userinput =~ /^courseidput/) {
2857: if(isClient) {
2858: my ($cmd,$udom,$what)=split(/:/,$userinput);
2859: chomp($what);
2860: $udom=~s/\W//g;
2861: my $proname=
2862: "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
2863: my $now=time;
2864: my @pairs=split(/\&/,$what);
2865: my %hash;
2866: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
2867: foreach my $pair (@pairs) {
2868: my ($key,$descr,$inst_code)=split(/=/,$pair);
2869: $hash{$key}=$descr.':'.$inst_code.':'.$now;
2870: }
2871: if (untie(%hash)) {
2872: print $client "ok\n";
2873: } else {
2874: print $client "error: ".($!+0)
2875: ." untie(GDBM) Failed ".
2876: "while attempting courseidput\n";
2877: }
2878: } else {
2879: print $client "error: ".($!+0)
2880: ." tie(GDBM) Failed ".
2881: "while attempting courseidput\n";
2882: }
2883: } else {
2884: Reply($client, "refused\n", $userinput);
2885:
2886: }
2887: # ---------------------------------------------------------------- courseiddump
2888: } elsif ($userinput =~ /^courseiddump/) {
2889: if(isClient) {
2890: my ($cmd,$udom,$since,$description)
2891: =split(/:/,$userinput);
2892: if (defined($description)) {
2893: $description=&unescape($description);
2894: } else {
2895: $description='.';
2896: }
2897: unless (defined($since)) { $since=0; }
2898: my $qresult='';
2899: my $proname=
2900: "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
2901: my %hash;
2902: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
2903: while (my ($key,$value) = each(%hash)) {
2904: my ($descr,$lasttime,$inst_code);
2905: if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {
2906: ($descr,$inst_code,$lasttime)=($1,$2,$3);
2907: } else {
2908: ($descr,$lasttime) = split(/\:/,$value);
2909: }
2910: if ($lasttime<$since) { next; }
2911: if ($description eq '.') {
2912: $qresult.=$key.'='.$descr.':'.$inst_code.'&';
2913: } else {
2914: my $unescapeVal = &unescape($descr);
2915: if (eval('$unescapeVal=~/\Q$description\E/i')) {
2916: $qresult.=$key.'='.$descr.':'.$inst_code.'&';
2917: }
2918: }
2919: }
2920: if (untie(%hash)) {
2921: chop($qresult);
2922: print $client "$qresult\n";
2923: } else {
2924: print $client "error: ".($!+0)
2925: ." untie(GDBM) Failed ".
2926: "while attempting courseiddump\n";
2927: }
2928: } else {
2929: print $client "error: ".($!+0)
2930: ." tie(GDBM) Failed ".
2931: "while attempting courseiddump\n";
2932: }
2933: } else {
2934: Reply($client, "refused\n", $userinput);
2935:
2936: }
2937: # ----------------------------------------------------------------------- idput
2938: } elsif ($userinput =~ /^idput/) {
2939: if(isClient) {
2940: my ($cmd,$udom,$what)=split(/:/,$userinput);
2941: chomp($what);
2942: $udom=~s/\W//g;
2943: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
2944: my $now=time;
2945: my @pairs=split(/\&/,$what);
2946: my %hash;
2947: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
2948: {
2949: my $hfh;
2950: if ($hfh=IO::File->new(">>$proname.hist")) {
2951: print $hfh "P:$now:$what\n";
2952: }
2953: }
2954: foreach my $pair (@pairs) {
2955: my ($key,$value)=split(/=/,$pair);
2956: $hash{$key}=$value;
2957: }
2958: if (untie(%hash)) {
2959: print $client "ok\n";
2960: } else {
2961: print $client "error: ".($!+0)
2962: ." untie(GDBM) Failed ".
2963: "while attempting idput\n";
2964: }
2965: } else {
2966: print $client "error: ".($!+0)
2967: ." tie(GDBM) Failed ".
2968: "while attempting idput\n";
2969: }
2970: } else {
2971: Reply($client, "refused\n", $userinput);
2972:
2973: }
2974: # ----------------------------------------------------------------------- idget
2975: } elsif ($userinput =~ /^idget/) {
2976: if(isClient) {
2977: my ($cmd,$udom,$what)=split(/:/,$userinput);
2978: chomp($what);
2979: $udom=~s/\W//g;
2980: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
2981: my @queries=split(/\&/,$what);
2982: my $qresult='';
2983: my %hash;
2984: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
2985: for (my $i=0;$i<=$#queries;$i++) {
2986: $qresult.="$hash{$queries[$i]}&";
2987: }
2988: if (untie(%hash)) {
2989: $qresult=~s/\&$//;
2990: print $client "$qresult\n";
2991: } else {
2992: print $client "error: ".($!+0)
2993: ." untie(GDBM) Failed ".
2994: "while attempting idget\n";
2995: }
2996: } else {
2997: print $client "error: ".($!+0)
2998: ." tie(GDBM) Failed ".
2999: "while attempting idget\n";
3000: }
3001: } else {
3002: Reply($client, "refused\n", $userinput);
3003:
3004: }
3005: # ---------------------------------------------------------------------- tmpput
3006: } elsif ($userinput =~ /^tmpput/) {
3007: if(isClient) {
3008: my ($cmd,$what)=split(/:/,$userinput);
3009: my $store;
3010: $tmpsnum++;
3011: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
3012: $id=~s/\W/\_/g;
3013: $what=~s/\n//g;
3014: my $execdir=$perlvar{'lonDaemons'};
3015: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
3016: print $store $what;
3017: close $store;
3018: print $client "$id\n";
3019: }
3020: else {
3021: print $client "error: ".($!+0)
3022: ."IO::File->new Failed ".
3023: "while attempting tmpput\n";
3024: }
3025: } else {
3026: Reply($client, "refused\n", $userinput);
3027:
3028: }
3029:
3030: # ---------------------------------------------------------------------- tmpget
3031: } elsif ($userinput =~ /^tmpget/) {
3032: if(isClient) {
3033: my ($cmd,$id)=split(/:/,$userinput);
3034: chomp($id);
3035: $id=~s/\W/\_/g;
3036: my $store;
3037: my $execdir=$perlvar{'lonDaemons'};
3038: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
3039: my $reply=<$store>;
3040: print $client "$reply\n";
3041: close $store;
3042: }
3043: else {
3044: print $client "error: ".($!+0)
3045: ."IO::File->new Failed ".
3046: "while attempting tmpget\n";
3047: }
3048: } else {
3049: Reply($client, "refused\n", $userinput);
3050:
3051: }
3052: # ---------------------------------------------------------------------- tmpdel
3053: } elsif ($userinput =~ /^tmpdel/) {
3054: if(isClient) {
3055: my ($cmd,$id)=split(/:/,$userinput);
3056: chomp($id);
3057: $id=~s/\W/\_/g;
3058: my $execdir=$perlvar{'lonDaemons'};
3059: if (unlink("$execdir/tmp/$id.tmp")) {
3060: print $client "ok\n";
3061: } else {
3062: print $client "error: ".($!+0)
3063: ."Unlink tmp Failed ".
3064: "while attempting tmpdel\n";
3065: }
3066: } else {
3067: Reply($client, "refused\n", $userinput);
3068:
3069: }
3070: # ----------------------------------------- portfolio directory list (portls)
3071: } elsif ($userinput =~ /^portls/) {
3072: if(isClient) {
3073: my ($cmd,$uname,$udom)=split(/:/,$userinput);
3074: my $udir=propath($udom,$uname).'/userfiles/portfolio';
3075: my $dirLine='';
3076: my $dirContents='';
3077: if (opendir(LSDIR,$udir.'/')){
3078: while ($dirLine = readdir(LSDIR)){
3079: $dirContents = $dirContents.$dirLine.'<br />';
3080: }
3081: } else {
3082: $dirContents = "No directory found\n";
3083: }
3084: print $client $dirContents."\n";
3085: } else {
3086: Reply($client, "refused\n", $userinput);
3087: }
3088: # -------------------------------------------------------------------------- ls
3089: } elsif ($userinput =~ /^ls/) {
3090: if(isClient) {
3091: my $obs;
3092: my $rights;
3093: my ($cmd,$ulsdir)=split(/:/,$userinput);
3094: my $ulsout='';
3095: my $ulsfn;
3096: if (-e $ulsdir) {
3097: if(-d $ulsdir) {
3098: if (opendir(LSDIR,$ulsdir)) {
3099: while ($ulsfn=readdir(LSDIR)) {
3100: undef $obs, $rights;
3101: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
3102: #We do some obsolete checking here
3103: if(-e $ulsdir.'/'.$ulsfn.".meta") {
3104: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
3105: my @obsolete=<FILE>;
3106: foreach my $obsolete (@obsolete) {
3107: if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
3108: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
3109: }
3110: }
3111: $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
3112: if($obs eq '1') { $ulsout.="&1"; }
3113: else { $ulsout.="&0"; }
3114: if($rights eq '1') { $ulsout.="&1:"; }
3115: else { $ulsout.="&0:"; }
3116: }
3117: closedir(LSDIR);
3118: }
3119: } else {
3120: my @ulsstats=stat($ulsdir);
3121: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
3122: }
3123: } else {
3124: $ulsout='no_such_dir';
3125: }
3126: if ($ulsout eq '') { $ulsout='empty'; }
3127: print $client "$ulsout\n";
3128: } else {
3129: Reply($client, "refused\n", $userinput);
3130:
3131: }
3132: # ----------------------------------------------------------------- setannounce
3133: } elsif ($userinput =~ /^setannounce/) {
3134: if (isClient) {
3135: my ($cmd,$announcement)=split(/:/,$userinput);
3136: chomp($announcement);
3137: $announcement=&unescape($announcement);
3138: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
3139: '/announcement.txt')) {
3140: print $store $announcement;
3141: close $store;
3142: print $client "ok\n";
3143: } else {
3144: print $client "error: ".($!+0)."\n";
3145: }
3146: } else {
3147: Reply($client, "refused\n", $userinput);
3148:
3149: }
3150: # ------------------------------------------------------------------ Hanging up
3151: } elsif (($userinput =~ /^exit/) ||
3152: ($userinput =~ /^init/)) { # no restrictions.
3153: &logthis(
3154: "Client $clientip ($clientname) hanging up: $userinput");
3155: print $client "bye\n";
3156: $client->shutdown(2); # shutdown the socket forcibly.
3157: $client->close();
3158: return 0;
3159:
3160: # ---------------------------------- set current host/domain
3161: } elsif ($userinput =~ /^sethost/) {
3162: if (isClient) {
3163: print $client &sethost($userinput)."\n";
3164: } else {
3165: print $client "refused\n";
3166: }
3167: #---------------------------------- request file (?) version.
3168: } elsif ($userinput =~/^version/) {
3169: if (isClient) {
3170: print $client &version($userinput)."\n";
3171: } else {
3172: print $client "refused\n";
3173: }
3174: #------------------------------- is auto-enrollment enabled?
3175: } elsif ($userinput =~/^autorun/) {
3176: if (isClient) {
3177: my ($cmd,$cdom) = split(/:/,$userinput);
3178: my $outcome = &localenroll::run($cdom);
3179: print $client "$outcome\n";
3180: } else {
3181: print $client "0\n";
3182: }
3183: #------------------------------- get official sections (for auto-enrollment).
3184: } elsif ($userinput =~/^autogetsections/) {
3185: if (isClient) {
3186: my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
3187: my @secs = &localenroll::get_sections($coursecode,$cdom);
3188: my $seclist = &escape(join(':',@secs));
3189: print $client "$seclist\n";
3190: } else {
3191: print $client "refused\n";
3192: }
3193: #----------------------- validate owner of new course section (for auto-enrollment).
3194: } elsif ($userinput =~/^autonewcourse/) {
3195: if (isClient) {
3196: my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
3197: my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
3198: print $client "$outcome\n";
3199: } else {
3200: print $client "refused\n";
3201: }
3202: #-------------- validate course section in schedule of classes (for auto-enrollment).
3203: } elsif ($userinput =~/^autovalidatecourse/) {
3204: if (isClient) {
3205: my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
3206: my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
3207: print $client "$outcome\n";
3208: } else {
3209: print $client "refused\n";
3210: }
3211: #--------------------------- create password for new user (for auto-enrollment).
3212: } elsif ($userinput =~/^autocreatepassword/) {
3213: if (isClient) {
3214: my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
3215: my ($create_passwd,$authchk);
3216: ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);
3217: print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
3218: } else {
3219: print $client "refused\n";
3220: }
3221: #--------------------------- read and remove temporary files (for auto-enrollment).
3222: } elsif ($userinput =~/^autoretrieve/) {
3223: if (isClient) {
3224: my ($cmd,$filename) = split(/:/,$userinput);
3225: my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
3226: if ( (-e $source) && ($filename ne '') ) {
3227: my $reply = '';
3228: if (open(my $fh,$source)) {
3229: while (<$fh>) {
3230: chomp($_);
3231: $_ =~ s/^\s+//g;
3232: $_ =~ s/\s+$//g;
3233: $reply .= $_;
3234: }
3235: close($fh);
3236: print $client &escape($reply)."\n";
3237: # unlink($source);
3238: } else {
3239: print $client "error\n";
3240: }
3241: } else {
3242: print $client "error\n";
3243: }
3244: } else {
3245: print $client "refused\n";
3246: }
3247: #--------------------- read and retrieve institutional code format (for support form).
3248: } elsif ($userinput =~/^autoinstcodeformat/) {
3249: if (isClient) {
3250: my $reply;
3251: my($cmd,$cdom,$course) = split(/:/,$userinput);
3252: my @pairs = split/\&/,$course;
3253: my %instcodes = ();
3254: my %codes = ();
3255: my @codetitles = ();
3256: my %cat_titles = ();
3257: my %cat_order = ();
3258: foreach (@pairs) {
3259: my ($key,$value) = split/=/,$_;
3260: $instcodes{&unescape($key)} = &unescape($value);
3261: }
3262: my $formatreply = &localenroll::instcode_format($cdom,\%instcodes,\%codes,\@codetitles,\%cat_titles,\%cat_order);
3263: if ($formatreply eq 'ok') {
3264: my $codes_str = &hash2str(%codes);
3265: my $codetitles_str = &array2str(@codetitles);
3266: my $cat_titles_str = &hash2str(%cat_titles);
3267: my $cat_order_str = &hash2str(%cat_order);
3268: print $client $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'.$cat_order_str."\n";
3269: }
3270: } else {
3271: print $client "refused\n";
3272: }
3273: # ------------------------------------------------------------- unknown command
3274:
3275: } else {
3276: # unknown command
3277: print $client "unknown_cmd\n";
3278: }
3279: # -------------------------------------------------------------------- complete
3280: Debug("process_request - returning 1");
3281: return 1;
3282: }
3283: #
3284: # Decipher encoded traffic
3285: # Parameters:
3286: # input - Encoded data.
3287: # Returns:
3288: # Decoded data or undef if encryption key was not yet negotiated.
3289: # Implicit input:
3290: # cipher - This global holds the negotiated encryption key.
3291: #
3292: sub decipher {
3293: my ($input) = @_;
3294: my $output = '';
3295:
3296:
3297: if($cipher) {
3298: my($enc, $enclength, $encinput) = split(/:/, $input);
3299: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
3300: $output .=
3301: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
3302: }
3303: return substr($output, 0, $enclength);
3304: } else {
3305: return undef;
3306: }
3307: }
3308:
3309: #
3310: # Register a command processor. This function is invoked to register a sub
3311: # to process a request. Once registered, the ProcessRequest sub can automatically
3312: # dispatch requests to an appropriate sub, and do the top level validity checking
3313: # as well:
3314: # - Is the keyword recognized.
3315: # - Is the proper client type attempting the request.
3316: # - Is the request encrypted if it has to be.
3317: # Parameters:
3318: # $request_name - Name of the request being registered.
3319: # This is the command request that will match
3320: # against the hash keywords to lookup the information
3321: # associated with the dispatch information.
3322: # $procedure - Reference to a sub to call to process the request.
3323: # All subs get called as follows:
3324: # Procedure($cmd, $tail, $replyfd, $key)
3325: # $cmd - the actual keyword that invoked us.
3326: # $tail - the tail of the request that invoked us.
3327: # $replyfd- File descriptor connected to the client
3328: # $must_encode - True if the request must be encoded to be good.
3329: # $client_ok - True if it's ok for a client to request this.
3330: # $manager_ok - True if it's ok for a manager to request this.
3331: # Side effects:
3332: # - On success, the Dispatcher hash has an entry added for the key $RequestName
3333: # - On failure, the program will die as it's a bad internal bug to try to
3334: # register a duplicate command handler.
3335: #
3336: sub register_handler {
3337: my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_;
3338:
3339: # Don't allow duplication#
3340:
3341: if (defined $Dispatcher{$request_name}) {
3342: die "Attempting to define a duplicate request handler for $request_name\n";
3343: }
3344: # Build the client type mask:
3345:
3346: my $client_type_mask = 0;
3347: if($client_ok) {
3348: $client_type_mask |= $CLIENT_OK;
3349: }
3350: if($manager_ok) {
3351: $client_type_mask |= $MANAGER_OK;
3352: }
3353:
3354: # Enter the hash:
3355:
3356: my @entry = ($procedure, $must_encode, $client_type_mask);
3357:
3358: $Dispatcher{$request_name} = \@entry;
3359:
3360: }
3361:
3362:
3363: #------------------------------------------------------------------
3364:
3365:
3366:
3367:
3368: #
3369: # Convert an error return code from lcpasswd to a string value.
3370: #
3371: sub lcpasswdstrerror {
3372: my $ErrorCode = shift;
3373: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
3374: return "lcpasswd Unrecognized error return value ".$ErrorCode;
3375: } else {
3376: return $passwderrors[$ErrorCode];
3377: }
3378: }
3379:
3380: #
3381: # Convert an error return code from lcuseradd to a string value:
3382: #
3383: sub lcuseraddstrerror {
3384: my $ErrorCode = shift;
3385: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
3386: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
3387: } else {
3388: return $adderrors[$ErrorCode];
3389: }
3390: }
3391:
3392: # grabs exception and records it to log before exiting
3393: sub catchexception {
3394: my ($error)=@_;
3395: $SIG{'QUIT'}='DEFAULT';
3396: $SIG{__DIE__}='DEFAULT';
3397: &status("Catching exception");
3398: &logthis("<font color='red'>CRITICAL: "
3399: ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
3400: ."a crash with this error msg->[$error]</font>");
3401: &logthis('Famous last words: '.$status.' - '.$lastlog);
3402: if ($client) { print $client "error: $error\n"; }
3403: $server->close();
3404: die($error);
3405: }
3406: sub timeout {
3407: &status("Handling Timeout");
3408: &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
3409: &catchexception('Timeout');
3410: }
3411: # -------------------------------- Set signal handlers to record abnormal exits
3412:
3413:
3414: $SIG{'QUIT'}=\&catchexception;
3415: $SIG{__DIE__}=\&catchexception;
3416:
3417: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
3418: &status("Read loncapa.conf and loncapa_apache.conf");
3419: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
3420: %perlvar=%{$perlvarref};
3421: undef $perlvarref;
3422:
3423: # ----------------------------- Make sure this process is running from user=www
3424: my $wwwid=getpwnam('www');
3425: if ($wwwid!=$<) {
3426: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
3427: my $subj="LON: $currenthostid User ID mismatch";
3428: system("echo 'User ID mismatch. lond must be run as user www.' |\
3429: mailto $emailto -s '$subj' > /dev/null");
3430: exit 1;
3431: }
3432:
3433: # --------------------------------------------- Check if other instance running
3434:
3435: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
3436:
3437: if (-e $pidfile) {
3438: my $lfh=IO::File->new("$pidfile");
3439: my $pide=<$lfh>;
3440: chomp($pide);
3441: if (kill 0 => $pide) { die "already running"; }
3442: }
3443:
3444: # ------------------------------------------------------------- Read hosts file
3445:
3446:
3447:
3448: # establish SERVER socket, bind and listen.
3449: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
3450: Type => SOCK_STREAM,
3451: Proto => 'tcp',
3452: Reuse => 1,
3453: Listen => 10 )
3454: or die "making socket: $@\n";
3455:
3456: # --------------------------------------------------------- Do global variables
3457:
3458: # global variables
3459:
3460: my %children = (); # keys are current child process IDs
3461:
3462: sub REAPER { # takes care of dead children
3463: $SIG{CHLD} = \&REAPER;
3464: &status("Handling child death");
3465: my $pid;
3466: do {
3467: $pid = waitpid(-1,&WNOHANG());
3468: if (defined($children{$pid})) {
3469: &logthis("Child $pid died");
3470: delete($children{$pid});
3471: } elsif ($pid > 0) {
3472: &logthis("Unknown Child $pid died");
3473: }
3474: } while ( $pid > 0 );
3475: foreach my $child (keys(%children)) {
3476: $pid = waitpid($child,&WNOHANG());
3477: if ($pid > 0) {
3478: &logthis("Child $child - $pid looks like we missed it's death");
3479: delete($children{$pid});
3480: }
3481: }
3482: &status("Finished Handling child death");
3483: }
3484:
3485: sub HUNTSMAN { # signal handler for SIGINT
3486: &status("Killing children (INT)");
3487: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
3488: kill 'INT' => keys %children;
3489: &logthis("Free socket: ".shutdown($server,2)); # free up socket
3490: my $execdir=$perlvar{'lonDaemons'};
3491: unlink("$execdir/logs/lond.pid");
3492: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
3493: &status("Done killing children");
3494: exit; # clean up with dignity
3495: }
3496:
3497: sub HUPSMAN { # signal handler for SIGHUP
3498: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
3499: &status("Killing children for restart (HUP)");
3500: kill 'INT' => keys %children;
3501: &logthis("Free socket: ".shutdown($server,2)); # free up socket
3502: &logthis("<font color='red'>CRITICAL: Restarting</font>");
3503: my $execdir=$perlvar{'lonDaemons'};
3504: unlink("$execdir/logs/lond.pid");
3505: &status("Restarting self (HUP)");
3506: exec("$execdir/lond"); # here we go again
3507: }
3508:
3509: #
3510: # Kill off hashes that describe the host table prior to re-reading it.
3511: # Hashes affected are:
3512: # %hostid, %hostdom %hostip %hostdns.
3513: #
3514: sub KillHostHashes {
3515: foreach my $key (keys %hostid) {
3516: delete $hostid{$key};
3517: }
3518: foreach my $key (keys %hostdom) {
3519: delete $hostdom{$key};
3520: }
3521: foreach my $key (keys %hostip) {
3522: delete $hostip{$key};
3523: }
3524: foreach my $key (keys %hostdns) {
3525: delete $hostdns{$key};
3526: }
3527: }
3528: #
3529: # Read in the host table from file and distribute it into the various hashes:
3530: #
3531: # - %hostid - Indexed by IP, the loncapa hostname.
3532: # - %hostdom - Indexed by loncapa hostname, the domain.
3533: # - %hostip - Indexed by hostid, the Ip address of the host.
3534: sub ReadHostTable {
3535:
3536: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
3537: my $myloncapaname = $perlvar{'lonHostID'};
3538: Debug("My loncapa name is : $myloncapaname");
3539: while (my $configline=<CONFIG>) {
3540: if (!($configline =~ /^\s*\#/)) {
3541: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
3542: chomp($ip); $ip=~s/\D+$//;
3543: $hostid{$ip}=$id; # LonCAPA name of host by IP.
3544: $hostdom{$id}=$domain; # LonCAPA domain name of host.
3545: $hostip{$id}=$ip; # IP address of host.
3546: $hostdns{$name} = $id; # LonCAPA name of host by DNS.
3547:
3548: if ($id eq $perlvar{'lonHostID'}) {
3549: Debug("Found me in the host table: $name");
3550: $thisserver=$name;
3551: }
3552: }
3553: }
3554: close(CONFIG);
3555: }
3556: #
3557: # Reload the Apache daemon's state.
3558: # This is done by invoking /home/httpd/perl/apachereload
3559: # a setuid perl script that can be root for us to do this job.
3560: #
3561: sub ReloadApache {
3562: my $execdir = $perlvar{'lonDaemons'};
3563: my $script = $execdir."/apachereload";
3564: system($script);
3565: }
3566:
3567: #
3568: # Called in response to a USR2 signal.
3569: # - Reread hosts.tab
3570: # - All children connected to hosts that were removed from hosts.tab
3571: # are killed via SIGINT
3572: # - All children connected to previously existing hosts are sent SIGUSR1
3573: # - Our internal hosts hash is updated to reflect the new contents of
3574: # hosts.tab causing connections from hosts added to hosts.tab to
3575: # now be honored.
3576: #
3577: sub UpdateHosts {
3578: &status("Reload hosts.tab");
3579: logthis('<font color="blue"> Updating connections </font>');
3580: #
3581: # The %children hash has the set of IP's we currently have children
3582: # on. These need to be matched against records in the hosts.tab
3583: # Any ip's no longer in the table get killed off they correspond to
3584: # either dropped or changed hosts. Note that the re-read of the table
3585: # will take care of new and changed hosts as connections come into being.
3586:
3587:
3588: KillHostHashes;
3589: ReadHostTable;
3590:
3591: foreach my $child (keys %children) {
3592: my $childip = $children{$child};
3593: if(!$hostid{$childip}) {
3594: logthis('<font color="blue"> UpdateHosts killing child '
3595: ." $child for ip $childip </font>");
3596: kill('INT', $child);
3597: } else {
3598: logthis('<font color="green"> keeping child for ip '
3599: ." $childip (pid=$child) </font>");
3600: }
3601: }
3602: ReloadApache;
3603: &status("Finished reloading hosts.tab");
3604: }
3605:
3606:
3607: sub checkchildren {
3608: &status("Checking on the children (sending signals)");
3609: &initnewstatus();
3610: &logstatus();
3611: &logthis('Going to check on the children');
3612: my $docdir=$perlvar{'lonDocRoot'};
3613: foreach (sort keys %children) {
3614: #sleep 1;
3615: unless (kill 'USR1' => $_) {
3616: &logthis ('Child '.$_.' is dead');
3617: &logstatus($$.' is dead');
3618: delete($children{$_});
3619: }
3620: }
3621: sleep 5;
3622: $SIG{ALRM} = sub { Debug("timeout");
3623: die "timeout"; };
3624: $SIG{__DIE__} = 'DEFAULT';
3625: &status("Checking on the children (waiting for reports)");
3626: foreach (sort keys %children) {
3627: unless (-e "$docdir/lon-status/londchld/$_.txt") {
3628: eval {
3629: alarm(300);
3630: &logthis('Child '.$_.' did not respond');
3631: kill 9 => $_;
3632: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
3633: #$subj="LON: $currenthostid killed lond process $_";
3634: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
3635: #$execdir=$perlvar{'lonDaemons'};
3636: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
3637: delete($children{$_});
3638: alarm(0);
3639: }
3640: }
3641: }
3642: $SIG{ALRM} = 'DEFAULT';
3643: $SIG{__DIE__} = \&catchexception;
3644: &status("Finished checking children");
3645: &logthis('Finished Checking children');
3646: }
3647:
3648: # --------------------------------------------------------------------- Logging
3649:
3650: sub logthis {
3651: my $message=shift;
3652: my $execdir=$perlvar{'lonDaemons'};
3653: my $fh=IO::File->new(">>$execdir/logs/lond.log");
3654: my $now=time;
3655: my $local=localtime($now);
3656: $lastlog=$local.': '.$message;
3657: print $fh "$local ($$): $message\n";
3658: }
3659:
3660: # ------------------------- Conditional log if $DEBUG true.
3661: sub Debug {
3662: my $message = shift;
3663: if($DEBUG) {
3664: &logthis($message);
3665: }
3666: }
3667:
3668: #
3669: # Sub to do replies to client.. this gives a hook for some
3670: # debug tracing too:
3671: # Parameters:
3672: # fd - File open on client.
3673: # reply - Text to send to client.
3674: # request - Original request from client.
3675: #
3676: sub Reply {
3677: my ($fd, $reply, $request) = @_;
3678: print $fd $reply;
3679: Debug("Request was $request Reply was $reply");
3680:
3681: $Transactions++;
3682:
3683:
3684: }
3685:
3686:
3687: #
3688: # Sub to report a failure.
3689: # This function:
3690: # - Increments the failure statistic counters.
3691: # - Invokes Reply to send the error message to the client.
3692: # Parameters:
3693: # fd - File descriptor open on the client
3694: # reply - Reply text to emit.
3695: # request - The original request message (used by Reply
3696: # to debug if that's enabled.
3697: # Implicit outputs:
3698: # $Failures- The number of failures is incremented.
3699: # Reply (invoked here) sends a message to the
3700: # client:
3701: #
3702: sub Failure {
3703: my $fd = shift;
3704: my $reply = shift;
3705: my $request = shift;
3706:
3707: $Failures++;
3708: Reply($fd, $reply, $request); # That's simple eh?
3709: }
3710: # ------------------------------------------------------------------ Log status
3711:
3712: sub logstatus {
3713: &status("Doing logging");
3714: my $docdir=$perlvar{'lonDocRoot'};
3715: {
3716: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
3717: print $fh $status."\n".$lastlog."\n".time."\n$keymode";
3718: $fh->close();
3719: }
3720: &status("Finished $$.txt");
3721: {
3722: open(LOG,">>$docdir/lon-status/londstatus.txt");
3723: flock(LOG,LOCK_EX);
3724: print LOG $$."\t".$clientname."\t".$currenthostid."\t"
3725: .$status."\t".$lastlog."\t $keymode\n";
3726: flock(DB,LOCK_UN);
3727: close(LOG);
3728: }
3729: &status("Finished logging");
3730: }
3731:
3732: sub initnewstatus {
3733: my $docdir=$perlvar{'lonDocRoot'};
3734: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
3735: my $now=time;
3736: my $local=localtime($now);
3737: print $fh "LOND status $local - parent $$\n\n";
3738: opendir(DIR,"$docdir/lon-status/londchld");
3739: while (my $filename=readdir(DIR)) {
3740: unlink("$docdir/lon-status/londchld/$filename");
3741: }
3742: closedir(DIR);
3743: }
3744:
3745: # -------------------------------------------------------------- Status setting
3746:
3747: sub status {
3748: my $what=shift;
3749: my $now=time;
3750: my $local=localtime($now);
3751: $status=$local.': '.$what;
3752: $0='lond: '.$what.' '.$local;
3753: }
3754:
3755: # -------------------------------------------------------- Escape Special Chars
3756:
3757: sub escape {
3758: my $str=shift;
3759: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
3760: return $str;
3761: }
3762:
3763: # ----------------------------------------------------- Un-Escape Special Chars
3764:
3765: sub unescape {
3766: my $str=shift;
3767: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
3768: return $str;
3769: }
3770:
3771: # ----------------------------------------------------------- Send USR1 to lonc
3772:
3773: sub reconlonc {
3774: my $peerfile=shift;
3775: &logthis("Trying to reconnect for $peerfile");
3776: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
3777: if (my $fh=IO::File->new("$loncfile")) {
3778: my $loncpid=<$fh>;
3779: chomp($loncpid);
3780: if (kill 0 => $loncpid) {
3781: &logthis("lonc at pid $loncpid responding, sending USR1");
3782: kill USR1 => $loncpid;
3783: } else {
3784: &logthis(
3785: "<font color='red'>CRITICAL: "
3786: ."lonc at pid $loncpid not responding, giving up</font>");
3787: }
3788: } else {
3789: &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
3790: }
3791: }
3792:
3793: # -------------------------------------------------- Non-critical communication
3794:
3795: sub subreply {
3796: my ($cmd,$server)=@_;
3797: my $peerfile="$perlvar{'lonSockDir'}/$server";
3798: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
3799: Type => SOCK_STREAM,
3800: Timeout => 10)
3801: or return "con_lost";
3802: print $sclient "$cmd\n";
3803: my $answer=<$sclient>;
3804: chomp($answer);
3805: if (!$answer) { $answer="con_lost"; }
3806: return $answer;
3807: }
3808:
3809: sub reply {
3810: my ($cmd,$server)=@_;
3811: my $answer;
3812: if ($server ne $currenthostid) {
3813: $answer=subreply($cmd,$server);
3814: if ($answer eq 'con_lost') {
3815: $answer=subreply("ping",$server);
3816: if ($answer ne $server) {
3817: &logthis("sub reply: answer != server answer is $answer, server is $server");
3818: &reconlonc("$perlvar{'lonSockDir'}/$server");
3819: }
3820: $answer=subreply($cmd,$server);
3821: }
3822: } else {
3823: $answer='self_reply';
3824: }
3825: return $answer;
3826: }
3827:
3828: # -------------------------------------------------------------- Talk to lonsql
3829:
3830: sub sqlreply {
3831: my ($cmd)=@_;
3832: my $answer=subsqlreply($cmd);
3833: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
3834: return $answer;
3835: }
3836:
3837: sub subsqlreply {
3838: my ($cmd)=@_;
3839: my $unixsock="mysqlsock";
3840: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
3841: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
3842: Type => SOCK_STREAM,
3843: Timeout => 10)
3844: or return "con_lost";
3845: print $sclient "$cmd\n";
3846: my $answer=<$sclient>;
3847: chomp($answer);
3848: if (!$answer) { $answer="con_lost"; }
3849: return $answer;
3850: }
3851:
3852: # -------------------------------------------- Return path to profile directory
3853:
3854: sub propath {
3855: my ($udom,$uname)=@_;
3856: $udom=~s/\W//g;
3857: $uname=~s/\W//g;
3858: my $subdir=$uname.'__';
3859: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
3860: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
3861: return $proname;
3862: }
3863:
3864: # --------------------------------------- Is this the home server of an author?
3865:
3866: sub ishome {
3867: my $author=shift;
3868: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
3869: my ($udom,$uname)=split(/\//,$author);
3870: my $proname=propath($udom,$uname);
3871: if (-e $proname) {
3872: return 'owner';
3873: } else {
3874: return 'not_owner';
3875: }
3876: }
3877:
3878: # ======================================================= Continue main program
3879: # ---------------------------------------------------- Fork once and dissociate
3880:
3881: my $fpid=fork;
3882: exit if $fpid;
3883: die "Couldn't fork: $!" unless defined ($fpid);
3884:
3885: POSIX::setsid() or die "Can't start new session: $!";
3886:
3887: # ------------------------------------------------------- Write our PID on disk
3888:
3889: my $execdir=$perlvar{'lonDaemons'};
3890: open (PIDSAVE,">$execdir/logs/lond.pid");
3891: print PIDSAVE "$$\n";
3892: close(PIDSAVE);
3893: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
3894: &status('Starting');
3895:
3896:
3897:
3898: # ----------------------------------------------------- Install signal handlers
3899:
3900:
3901: $SIG{CHLD} = \&REAPER;
3902: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
3903: $SIG{HUP} = \&HUPSMAN;
3904: $SIG{USR1} = \&checkchildren;
3905: $SIG{USR2} = \&UpdateHosts;
3906:
3907: # Read the host hashes:
3908:
3909: ReadHostTable;
3910:
3911: # --------------------------------------------------------------
3912: # Accept connections. When a connection comes in, it is validated
3913: # and if good, a child process is created to process transactions
3914: # along the connection.
3915:
3916: while (1) {
3917: &status('Starting accept');
3918: $client = $server->accept() or next;
3919: &status('Accepted '.$client.' off to spawn');
3920: make_new_child($client);
3921: &status('Finished spawning');
3922: }
3923:
3924: sub make_new_child {
3925: my $pid;
3926: # my $cipher; # Now global
3927: my $sigset;
3928:
3929: $client = shift;
3930: &status('Starting new child '.$client);
3931: &logthis('<font color="green"> Attempting to start child ('.$client.
3932: ")</font>");
3933: # block signal for fork
3934: $sigset = POSIX::SigSet->new(SIGINT);
3935: sigprocmask(SIG_BLOCK, $sigset)
3936: or die "Can't block SIGINT for fork: $!\n";
3937:
3938: die "fork: $!" unless defined ($pid = fork);
3939:
3940: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
3941: # connection liveness.
3942:
3943: #
3944: # Figure out who we're talking to so we can record the peer in
3945: # the pid hash.
3946: #
3947: my $caller = getpeername($client);
3948: my ($port,$iaddr);
3949: if (defined($caller) && length($caller) > 0) {
3950: ($port,$iaddr)=unpack_sockaddr_in($caller);
3951: } else {
3952: &logthis("Unable to determine who caller was, getpeername returned nothing");
3953: }
3954: if (defined($iaddr)) {
3955: $clientip = inet_ntoa($iaddr);
3956: Debug("Connected with $clientip");
3957: $clientdns = gethostbyaddr($iaddr, AF_INET);
3958: Debug("Connected with $clientdns by name");
3959: } else {
3960: &logthis("Unable to determine clientip");
3961: $clientip='Unavailable';
3962: }
3963:
3964: if ($pid) {
3965: # Parent records the child's birth and returns.
3966: sigprocmask(SIG_UNBLOCK, $sigset)
3967: or die "Can't unblock SIGINT for fork: $!\n";
3968: $children{$pid} = $clientip;
3969: &status('Started child '.$pid);
3970: return;
3971: } else {
3972: # Child can *not* return from this subroutine.
3973: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
3974: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
3975: #don't get intercepted
3976: $SIG{USR1}= \&logstatus;
3977: $SIG{ALRM}= \&timeout;
3978: $lastlog='Forked ';
3979: $status='Forked';
3980:
3981: # unblock signals
3982: sigprocmask(SIG_UNBLOCK, $sigset)
3983: or die "Can't unblock SIGINT for fork: $!\n";
3984:
3985: # my $tmpsnum=0; # Now global
3986: #---------------------------------------------------- kerberos 5 initialization
3987: &Authen::Krb5::init_context();
3988: &Authen::Krb5::init_ets();
3989:
3990: &status('Accepted connection');
3991: # =============================================================================
3992: # do something with the connection
3993: # -----------------------------------------------------------------------------
3994: # see if we know client and 'check' for spoof IP by ineffective challenge
3995:
3996: ReadManagerTable; # May also be a manager!!
3997:
3998: my $clientrec=($hostid{$clientip} ne undef);
3999: my $ismanager=($managers{$clientip} ne undef);
4000: $clientname = "[unknonwn]";
4001: if($clientrec) { # Establish client type.
4002: $ConnectionType = "client";
4003: $clientname = $hostid{$clientip};
4004: if($ismanager) {
4005: $ConnectionType = "both";
4006: }
4007: } else {
4008: $ConnectionType = "manager";
4009: $clientname = $managers{$clientip};
4010: }
4011: my $clientok;
4012:
4013: if ($clientrec || $ismanager) {
4014: &status("Waiting for init from $clientip $clientname");
4015: &logthis('<font color="yellow">INFO: Connection, '.
4016: $clientip.
4017: " ($clientname) connection type = $ConnectionType </font>" );
4018: &status("Connecting $clientip ($clientname))");
4019: my $remotereq=<$client>;
4020: chomp($remotereq);
4021: Debug("Got init: $remotereq");
4022: my $inikeyword = split(/:/, $remotereq);
4023: if ($remotereq =~ /^init/) {
4024: &sethost("sethost:$perlvar{'lonHostID'}");
4025: #
4026: # If the remote is attempting a local init... give that a try:
4027: #
4028: my ($i, $inittype) = split(/:/, $remotereq);
4029:
4030: # If the connection type is ssl, but I didn't get my
4031: # certificate files yet, then I'll drop back to
4032: # insecure (if allowed).
4033:
4034: if($inittype eq "ssl") {
4035: my ($ca, $cert) = lonssl::CertificateFile;
4036: my $kfile = lonssl::KeyFile;
4037: if((!$ca) ||
4038: (!$cert) ||
4039: (!$kfile)) {
4040: $inittype = ""; # This forces insecure attempt.
4041: &logthis("<font color=\"blue\"> Certificates not "
4042: ."installed -- trying insecure auth</font>");
4043: } else { # SSL certificates are in place so
4044: } # Leave the inittype alone.
4045: }
4046:
4047: if($inittype eq "local") {
4048: my $key = LocalConnection($client, $remotereq);
4049: if($key) {
4050: Debug("Got local key $key");
4051: $clientok = 1;
4052: my $cipherkey = pack("H32", $key);
4053: $cipher = new IDEA($cipherkey);
4054: print $client "ok:local\n";
4055: &logthis('<font color="green"'
4056: . "Successful local authentication </font>");
4057: $keymode = "local"
4058: } else {
4059: Debug("Failed to get local key");
4060: $clientok = 0;
4061: shutdown($client, 3);
4062: close $client;
4063: }
4064: } elsif ($inittype eq "ssl") {
4065: my $key = SSLConnection($client);
4066: if ($key) {
4067: $clientok = 1;
4068: my $cipherkey = pack("H32", $key);
4069: $cipher = new IDEA($cipherkey);
4070: &logthis('<font color="green">'
4071: ."Successfull ssl authentication with $clientname </font>");
4072: $keymode = "ssl";
4073:
4074: } else {
4075: $clientok = 0;
4076: close $client;
4077: }
4078:
4079: } else {
4080: my $ok = InsecureConnection($client);
4081: if($ok) {
4082: $clientok = 1;
4083: &logthis('<font color="green">'
4084: ."Successful insecure authentication with $clientname </font>");
4085: print $client "ok\n";
4086: $keymode = "insecure";
4087: } else {
4088: &logthis('<font color="yellow">'
4089: ."Attempted insecure connection disallowed </font>");
4090: close $client;
4091: $clientok = 0;
4092:
4093: }
4094: }
4095: } else {
4096: &logthis(
4097: "<font color='blue'>WARNING: "
4098: ."$clientip failed to initialize: >$remotereq< </font>");
4099: &status('No init '.$clientip);
4100: }
4101:
4102: } else {
4103: &logthis(
4104: "<font color='blue'>WARNING: Unknown client $clientip</font>");
4105: &status('Hung up on '.$clientip);
4106: }
4107:
4108: if ($clientok) {
4109: # ---------------- New known client connecting, could mean machine online again
4110:
4111: foreach my $id (keys(%hostip)) {
4112: if ($hostip{$id} ne $clientip ||
4113: $hostip{$currenthostid} eq $clientip) {
4114: # no need to try to do recon's to myself
4115: next;
4116: }
4117: &reconlonc("$perlvar{'lonSockDir'}/$id");
4118: }
4119: &logthis("<font color='green'>Established connection: $clientname</font>");
4120: &status('Will listen to '.$clientname);
4121: # ------------------------------------------------------------ Process requests
4122: my $keep_going = 1;
4123: my $user_input;
4124: while(($user_input = get_request) && $keep_going) {
4125: alarm(120);
4126: Debug("Main: Got $user_input\n");
4127: $keep_going = &process_request($user_input);
4128: alarm(0);
4129: &status('Listening to '.$clientname." ($keymode)");
4130: }
4131:
4132: # --------------------------------------------- client unknown or fishy, refuse
4133: } else {
4134: print $client "refused\n";
4135: $client->close();
4136: &logthis("<font color='blue'>WARNING: "
4137: ."Rejected client $clientip, closing connection</font>");
4138: }
4139: }
4140:
4141: # =============================================================================
4142:
4143: &logthis("<font color='red'>CRITICAL: "
4144: ."Disconnect from $clientip ($clientname)</font>");
4145:
4146:
4147: # this exit is VERY important, otherwise the child will become
4148: # a producer of more and more children, forking yourself into
4149: # process death.
4150: exit;
4151:
4152: }
4153:
4154:
4155: #
4156: # Checks to see if the input roleput request was to set
4157: # an author role. If so, invokes the lchtmldir script to set
4158: # up a correct public_html
4159: # Parameters:
4160: # request - The request sent to the rolesput subchunk.
4161: # We're looking for /domain/_au
4162: # domain - The domain in which the user is having roles doctored.
4163: # user - Name of the user for which the role is being put.
4164: # authtype - The authentication type associated with the user.
4165: #
4166: sub manage_permissions
4167: {
4168:
4169: my ($request, $domain, $user, $authtype) = @_;
4170:
4171: # See if the request is of the form /$domain/_au
4172: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
4173: my $execdir = $perlvar{'lonDaemons'};
4174: my $userhome= "/home/$user" ;
4175: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
4176: system("$execdir/lchtmldir $userhome $user $authtype");
4177: }
4178: }
4179:
4180:
4181: #
4182: # Return the full path of a user password file, whether it exists or not.
4183: # Parameters:
4184: # domain - Domain in which the password file lives.
4185: # user - name of the user.
4186: # Returns:
4187: # Full passwd path:
4188: #
4189: sub password_path {
4190: my ($domain, $user) = @_;
4191:
4192:
4193: my $path = &propath($domain, $user);
4194: $path .= "/passwd";
4195:
4196: return $path;
4197: }
4198:
4199: # Password Filename
4200: # Returns the path to a passwd file given domain and user... only if
4201: # it exists.
4202: # Parameters:
4203: # domain - Domain in which to search.
4204: # user - username.
4205: # Returns:
4206: # - If the password file exists returns its path.
4207: # - If the password file does not exist, returns undefined.
4208: #
4209: sub password_filename {
4210: my ($domain, $user) = @_;
4211:
4212: Debug ("PasswordFilename called: dom = $domain user = $user");
4213:
4214: my $path = &password_path($domain, $user);
4215: Debug("PasswordFilename got path: $path");
4216: if(-e $path) {
4217: return $path;
4218: } else {
4219: return undef;
4220: }
4221: }
4222:
4223: #
4224: # Rewrite the contents of the user's passwd file.
4225: # Parameters:
4226: # domain - domain of the user.
4227: # name - User's name.
4228: # contents - New contents of the file.
4229: # Returns:
4230: # 0 - Failed.
4231: # 1 - Success.
4232: #
4233: sub rewrite_password_file {
4234: my ($domain, $user, $contents) = @_;
4235:
4236: my $file = &password_filename($domain, $user);
4237: if (defined $file) {
4238: my $pf = IO::File->new(">$file");
4239: if($pf) {
4240: print $pf "$contents\n";
4241: return 1;
4242: } else {
4243: return 0;
4244: }
4245: } else {
4246: return 0;
4247: }
4248:
4249: }
4250:
4251: #
4252: # get_auth_type - Determines the authorization type of a user in a domain.
4253:
4254: # Returns the authorization type or nouser if there is no such user.
4255: #
4256: sub get_auth_type
4257: {
4258:
4259: my ($domain, $user) = @_;
4260:
4261: Debug("get_auth_type( $domain, $user ) \n");
4262: my $proname = &propath($domain, $user);
4263: my $passwdfile = "$proname/passwd";
4264: if( -e $passwdfile ) {
4265: my $pf = IO::File->new($passwdfile);
4266: my $realpassword = <$pf>;
4267: chomp($realpassword);
4268: Debug("Password info = $realpassword\n");
4269: my ($authtype, $contentpwd) = split(/:/, $realpassword);
4270: Debug("Authtype = $authtype, content = $contentpwd\n");
4271: my $availinfo = '';
4272: if($authtype eq 'krb4' or $authtype eq 'krb5') {
4273: $availinfo = $contentpwd;
4274: }
4275:
4276: return "$authtype:$availinfo";
4277: } else {
4278: Debug("Returning nouser");
4279: return "nouser";
4280: }
4281: }
4282:
4283: #
4284: # Validate a user given their domain, name and password. This utility
4285: # function is used by both AuthenticateHandler and ChangePasswordHandler
4286: # to validate the login credentials of a user.
4287: # Parameters:
4288: # $domain - The domain being logged into (this is required due to
4289: # the capability for multihomed systems.
4290: # $user - The name of the user being validated.
4291: # $password - The user's propoposed password.
4292: #
4293: # Returns:
4294: # 1 - The domain,user,pasword triplet corresponds to a valid
4295: # user.
4296: # 0 - The domain,user,password triplet is not a valid user.
4297: #
4298: sub validate_user {
4299: my ($domain, $user, $password) = @_;
4300:
4301:
4302: # Why negative ~pi you may well ask? Well this function is about
4303: # authentication, and therefore very important to get right.
4304: # I've initialized the flag that determines whether or not I've
4305: # validated correctly to a value it's not supposed to get.
4306: # At the end of this function. I'll ensure that it's not still that
4307: # value so we don't just wind up returning some accidental value
4308: # as a result of executing an unforseen code path that
4309: # did not set $validated.
4310:
4311: my $validated = -3.14159;
4312:
4313: # How we authenticate is determined by the type of authentication
4314: # the user has been assigned. If the authentication type is
4315: # "nouser", the user does not exist so we will return 0.
4316:
4317: my $contents = &get_auth_type($domain, $user);
4318: my ($howpwd, $contentpwd) = split(/:/, $contents);
4319:
4320: my $null = pack("C",0); # Used by kerberos auth types.
4321:
4322: if ($howpwd ne 'nouser') {
4323:
4324: if($howpwd eq "internal") { # Encrypted is in local password file.
4325: $validated = (crypt($password, $contentpwd) eq $contentpwd);
4326: }
4327: elsif ($howpwd eq "unix") { # User is a normal unix user.
4328: $contentpwd = (getpwnam($user))[1];
4329: if($contentpwd) {
4330: if($contentpwd eq 'x') { # Shadow password file...
4331: my $pwauth_path = "/usr/local/sbin/pwauth";
4332: open PWAUTH, "|$pwauth_path" or
4333: die "Cannot invoke authentication";
4334: print PWAUTH "$user\n$password\n";
4335: close PWAUTH;
4336: $validated = ! $?;
4337:
4338: } else { # Passwords in /etc/passwd.
4339: $validated = (crypt($password,
4340: $contentpwd) eq $contentpwd);
4341: }
4342: } else {
4343: $validated = 0;
4344: }
4345: }
4346: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
4347: if(! ($password =~ /$null/) ) {
4348: my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
4349: "",
4350: $contentpwd,,
4351: 'krbtgt',
4352: $contentpwd,
4353: 1,
4354: $password);
4355: if(!$k4error) {
4356: $validated = 1;
4357: } else {
4358: $validated = 0;
4359: &logthis('krb4: '.$user.', '.$contentpwd.', '.
4360: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
4361: }
4362: } else {
4363: $validated = 0; # Password has a match with null.
4364: }
4365: } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
4366: if(!($password =~ /$null/)) { # Null password not allowed.
4367: my $krbclient = &Authen::Krb5::parse_name($user.'@'
4368: .$contentpwd);
4369: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
4370: my $krbserver = &Authen::Krb5::parse_name($krbservice);
4371: my $credentials= &Authen::Krb5::cc_default();
4372: $credentials->initialize($krbclient);
4373: my $krbreturn = &Authen::KRb5::get_in_tkt_with_password($krbclient,
4374: $krbserver,
4375: $password,
4376: $credentials);
4377: $validated = ($krbreturn == 1);
4378: } else {
4379: $validated = 0;
4380: }
4381: } elsif ($howpwd eq "localauth") {
4382: # Authenticate via installation specific authentcation method:
4383: $validated = &localauth::localauth($user,
4384: $password,
4385: $contentpwd);
4386: } else { # Unrecognized auth is also bad.
4387: $validated = 0;
4388: }
4389: } else {
4390: $validated = 0;
4391: }
4392: #
4393: # $validated has the correct stat of the authentication:
4394: #
4395:
4396: unless ($validated != -3.14159) {
4397: die "ValidateUser - failed to set the value of validated";
4398: }
4399: return $validated;
4400: }
4401:
4402:
4403: sub addline {
4404: my ($fname,$hostid,$ip,$newline)=@_;
4405: my $contents;
4406: my $found=0;
4407: my $expr='^'.$hostid.':'.$ip.':';
4408: $expr =~ s/\./\\\./g;
4409: my $sh;
4410: if ($sh=IO::File->new("$fname.subscription")) {
4411: while (my $subline=<$sh>) {
4412: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
4413: }
4414: $sh->close();
4415: }
4416: $sh=IO::File->new(">$fname.subscription");
4417: if ($contents) { print $sh $contents; }
4418: if ($newline) { print $sh $newline; }
4419: $sh->close();
4420: return $found;
4421: }
4422:
4423: sub getchat {
4424: my ($cdom,$cname,$udom,$uname)=@_;
4425: my %hash;
4426: my $proname=&propath($cdom,$cname);
4427: my @entries=();
4428: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
4429: &GDBM_READER(),0640)) {
4430: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
4431: untie %hash;
4432: }
4433: my @participants=();
4434: my $cutoff=time-60;
4435: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
4436: &GDBM_WRCREAT(),0640)) {
4437: $hash{$uname.':'.$udom}=time;
4438: foreach (sort keys %hash) {
4439: if ($hash{$_}>$cutoff) {
4440: $participants[$#participants+1]='active_participant:'.$_;
4441: }
4442: }
4443: untie %hash;
4444: }
4445: return (@participants,@entries);
4446: }
4447:
4448: sub chatadd {
4449: my ($cdom,$cname,$newchat)=@_;
4450: my %hash;
4451: my $proname=&propath($cdom,$cname);
4452: my @entries=();
4453: my $time=time;
4454: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
4455: &GDBM_WRCREAT(),0640)) {
4456: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
4457: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
4458: my ($thentime,$idnum)=split(/\_/,$lastid);
4459: my $newid=$time.'_000000';
4460: if ($thentime==$time) {
4461: $idnum=~s/^0+//;
4462: $idnum++;
4463: $idnum=substr('000000'.$idnum,-6,6);
4464: $newid=$time.'_'.$idnum;
4465: }
4466: $hash{$newid}=$newchat;
4467: my $expired=$time-3600;
4468: foreach (keys %hash) {
4469: my ($thistime)=($_=~/(\d+)\_/);
4470: if ($thistime<$expired) {
4471: delete $hash{$_};
4472: }
4473: }
4474: untie %hash;
4475: }
4476: {
4477: my $hfh;
4478: if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
4479: print $hfh "$time:".&unescape($newchat)."\n";
4480: }
4481: }
4482: }
4483:
4484: sub unsub {
4485: my ($fname,$clientip)=@_;
4486: my $result;
4487: my $unsubs = 0; # Number of successful unsubscribes:
4488:
4489:
4490: # An old way subscriptions were handled was to have a
4491: # subscription marker file:
4492:
4493: Debug("Attempting unlink of $fname.$clientname");
4494: if (unlink("$fname.$clientname")) {
4495: $unsubs++; # Successful unsub via marker file.
4496: }
4497:
4498: # The more modern way to do it is to have a subscription list
4499: # file:
4500:
4501: if (-e "$fname.subscription") {
4502: my $found=&addline($fname,$clientname,$clientip,'');
4503: if ($found) {
4504: $unsubs++;
4505: }
4506: }
4507:
4508: # If either or both of these mechanisms succeeded in unsubscribing a
4509: # resource we can return ok:
4510:
4511: if($unsubs) {
4512: $result = "ok\n";
4513: } else {
4514: $result = "not_subscribed\n";
4515: }
4516:
4517: return $result;
4518: }
4519:
4520: sub currentversion {
4521: my $fname=shift;
4522: my $version=-1;
4523: my $ulsdir='';
4524: if ($fname=~/^(.+)\/[^\/]+$/) {
4525: $ulsdir=$1;
4526: }
4527: my ($fnamere1,$fnamere2);
4528: # remove version if already specified
4529: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
4530: # get the bits that go before and after the version number
4531: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
4532: $fnamere1=$1;
4533: $fnamere2='.'.$2;
4534: }
4535: if (-e $fname) { $version=1; }
4536: if (-e $ulsdir) {
4537: if(-d $ulsdir) {
4538: if (opendir(LSDIR,$ulsdir)) {
4539: my $ulsfn;
4540: while ($ulsfn=readdir(LSDIR)) {
4541: # see if this is a regular file (ignore links produced earlier)
4542: my $thisfile=$ulsdir.'/'.$ulsfn;
4543: unless (-l $thisfile) {
4544: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
4545: if ($1>$version) { $version=$1; }
4546: }
4547: }
4548: }
4549: closedir(LSDIR);
4550: $version++;
4551: }
4552: }
4553: }
4554: return $version;
4555: }
4556:
4557: sub thisversion {
4558: my $fname=shift;
4559: my $version=-1;
4560: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
4561: $version=$1;
4562: }
4563: return $version;
4564: }
4565:
4566: sub subscribe {
4567: my ($userinput,$clientip)=@_;
4568: my $result;
4569: my ($cmd,$fname)=split(/:/,$userinput);
4570: my $ownership=&ishome($fname);
4571: if ($ownership eq 'owner') {
4572: # explitly asking for the current version?
4573: unless (-e $fname) {
4574: my $currentversion=¤tversion($fname);
4575: if (&thisversion($fname)==$currentversion) {
4576: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
4577: my $root=$1;
4578: my $extension=$2;
4579: symlink($root.'.'.$extension,
4580: $root.'.'.$currentversion.'.'.$extension);
4581: unless ($extension=~/\.meta$/) {
4582: symlink($root.'.'.$extension.'.meta',
4583: $root.'.'.$currentversion.'.'.$extension.'.meta');
4584: }
4585: }
4586: }
4587: }
4588: if (-e $fname) {
4589: if (-d $fname) {
4590: $result="directory\n";
4591: } else {
4592: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
4593: my $now=time;
4594: my $found=&addline($fname,$clientname,$clientip,
4595: "$clientname:$clientip:$now\n");
4596: if ($found) { $result="$fname\n"; }
4597: # if they were subscribed to only meta data, delete that
4598: # subscription, when you subscribe to a file you also get
4599: # the metadata
4600: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
4601: $fname=~s/\/home\/httpd\/html\/res/raw/;
4602: $fname="http://$thisserver/".$fname;
4603: $result="$fname\n";
4604: }
4605: } else {
4606: $result="not_found\n";
4607: }
4608: } else {
4609: $result="rejected\n";
4610: }
4611: return $result;
4612: }
4613:
4614: sub make_passwd_file {
4615: my ($uname, $umode,$npass,$passfilename)=@_;
4616: my $result="ok\n";
4617: if ($umode eq 'krb4' or $umode eq 'krb5') {
4618: {
4619: my $pf = IO::File->new(">$passfilename");
4620: print $pf "$umode:$npass\n";
4621: }
4622: } elsif ($umode eq 'internal') {
4623: my $salt=time;
4624: $salt=substr($salt,6,2);
4625: my $ncpass=crypt($npass,$salt);
4626: {
4627: &Debug("Creating internal auth");
4628: my $pf = IO::File->new(">$passfilename");
4629: print $pf "internal:$ncpass\n";
4630: }
4631: } elsif ($umode eq 'localauth') {
4632: {
4633: my $pf = IO::File->new(">$passfilename");
4634: print $pf "localauth:$npass\n";
4635: }
4636: } elsif ($umode eq 'unix') {
4637: {
4638: #
4639: # Don't allow the creation of privileged accounts!!! that would
4640: # be real bad!!!
4641: #
4642: my $uid = getpwnam($uname);
4643: if((defined $uid) && ($uid == 0)) {
4644: &logthis(">>>Attempted to create privilged account blocked");
4645: return "no_priv_account_error\n";
4646: }
4647:
4648: my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd";
4649:
4650: my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status";
4651: {
4652: &Debug("Executing external: ".$execpath);
4653: &Debug("user = ".$uname.", Password =". $npass);
4654: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
4655: print $se "$uname\n";
4656: print $se "$npass\n";
4657: print $se "$npass\n";
4658: print $se "$lc_error_file\n"; # Status -> unique file.
4659: }
4660: my $error = IO::File->new("< $lc_error_file");
4661: my $useraddok = <$error>;
4662: $error->close;
4663: unlink($lc_error_file);
4664:
4665: chomp $useraddok;
4666:
4667: if($useraddok > 0) {
4668: my $error_text = &lcuseraddstrerror($useraddok);
4669: &logthis("Failed lcuseradd: $error_text");
4670: $result = "lcuseradd_failed:$error_text\n";
4671: } else {
4672: my $pf = IO::File->new(">$passfilename");
4673: print $pf "unix:\n";
4674: }
4675: }
4676: } elsif ($umode eq 'none') {
4677: {
4678: my $pf = IO::File->new("> $passfilename");
4679: print $pf "none:\n";
4680: }
4681: } else {
4682: $result="auth_mode_error\n";
4683: }
4684: return $result;
4685: }
4686:
4687: sub sethost {
4688: my ($remotereq) = @_;
4689: my (undef,$hostid)=split(/:/,$remotereq);
4690: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
4691: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
4692: $currenthostid =$hostid;
4693: $currentdomainid=$hostdom{$hostid};
4694: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
4695: } else {
4696: &logthis("Requested host id $hostid not an alias of ".
4697: $perlvar{'lonHostID'}." refusing connection");
4698: return 'unable_to_set';
4699: }
4700: return 'ok';
4701: }
4702:
4703: sub version {
4704: my ($userinput)=@_;
4705: $remoteVERSION=(split(/:/,$userinput))[1];
4706: return "version:$VERSION";
4707: }
4708:
4709: #There is a copy of this in lonnet.pm
4710: sub userload {
4711: my $numusers=0;
4712: {
4713: opendir(LONIDS,$perlvar{'lonIDsDir'});
4714: my $filename;
4715: my $curtime=time;
4716: while ($filename=readdir(LONIDS)) {
4717: if ($filename eq '.' || $filename eq '..') {next;}
4718: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
4719: if ($curtime-$mtime < 1800) { $numusers++; }
4720: }
4721: closedir(LONIDS);
4722: }
4723: my $userloadpercent=0;
4724: my $maxuserload=$perlvar{'lonUserLoadLim'};
4725: if ($maxuserload) {
4726: $userloadpercent=100*$numusers/$maxuserload;
4727: }
4728: $userloadpercent=sprintf("%.2f",$userloadpercent);
4729: return $userloadpercent;
4730: }
4731:
4732: # Routines for serializing arrays and hashes (copies from lonnet)
4733:
4734: sub array2str {
4735: my (@array) = @_;
4736: my $result=&arrayref2str(\@array);
4737: $result=~s/^__ARRAY_REF__//;
4738: $result=~s/__END_ARRAY_REF__$//;
4739: return $result;
4740: }
4741:
4742: sub arrayref2str {
4743: my ($arrayref) = @_;
4744: my $result='__ARRAY_REF__';
4745: foreach my $elem (@$arrayref) {
4746: if(ref($elem) eq 'ARRAY') {
4747: $result.=&arrayref2str($elem).'&';
4748: } elsif(ref($elem) eq 'HASH') {
4749: $result.=&hashref2str($elem).'&';
4750: } elsif(ref($elem)) {
4751: #print("Got a ref of ".(ref($elem))." skipping.");
4752: } else {
4753: $result.=&escape($elem).'&';
4754: }
4755: }
4756: $result=~s/\&$//;
4757: $result .= '__END_ARRAY_REF__';
4758: return $result;
4759: }
4760:
4761: sub hash2str {
4762: my (%hash) = @_;
4763: my $result=&hashref2str(\%hash);
4764: $result=~s/^__HASH_REF__//;
4765: $result=~s/__END_HASH_REF__$//;
4766: return $result;
4767: }
4768:
4769: sub hashref2str {
4770: my ($hashref)=@_;
4771: my $result='__HASH_REF__';
4772: foreach (sort(keys(%$hashref))) {
4773: if (ref($_) eq 'ARRAY') {
4774: $result.=&arrayref2str($_).'=';
4775: } elsif (ref($_) eq 'HASH') {
4776: $result.=&hashref2str($_).'=';
4777: } elsif (ref($_)) {
4778: $result.='=';
4779: #print("Got a ref of ".(ref($_))." skipping.");
4780: } else {
4781: if ($_) {$result.=&escape($_).'=';} else { last; }
4782: }
4783:
4784: if(ref($hashref->{$_}) eq 'ARRAY') {
4785: $result.=&arrayref2str($hashref->{$_}).'&';
4786: } elsif(ref($hashref->{$_}) eq 'HASH') {
4787: $result.=&hashref2str($hashref->{$_}).'&';
4788: } elsif(ref($hashref->{$_})) {
4789: $result.='&';
4790: #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
4791: } else {
4792: $result.=&escape($hashref->{$_}).'&';
4793: }
4794: }
4795: $result=~s/\&$//;
4796: $result .= '__END_HASH_REF__';
4797: return $result;
4798: }
4799:
4800: # ----------------------------------- POD (plain old documentation, CPAN style)
4801:
4802: =head1 NAME
4803:
4804: lond - "LON Daemon" Server (port "LOND" 5663)
4805:
4806: =head1 SYNOPSIS
4807:
4808: Usage: B<lond>
4809:
4810: Should only be run as user=www. This is a command-line script which
4811: is invoked by B<loncron>. There is no expectation that a typical user
4812: will manually start B<lond> from the command-line. (In other words,
4813: DO NOT START B<lond> YOURSELF.)
4814:
4815: =head1 DESCRIPTION
4816:
4817: There are two characteristics associated with the running of B<lond>,
4818: PROCESS MANAGEMENT (starting, stopping, handling child processes)
4819: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
4820: subscriptions, etc). These are described in two large
4821: sections below.
4822:
4823: B<PROCESS MANAGEMENT>
4824:
4825: Preforker - server who forks first. Runs as a daemon. HUPs.
4826: Uses IDEA encryption
4827:
4828: B<lond> forks off children processes that correspond to the other servers
4829: in the network. Management of these processes can be done at the
4830: parent process level or the child process level.
4831:
4832: B<logs/lond.log> is the location of log messages.
4833:
4834: The process management is now explained in terms of linux shell commands,
4835: subroutines internal to this code, and signal assignments:
4836:
4837: =over 4
4838:
4839: =item *
4840:
4841: PID is stored in B<logs/lond.pid>
4842:
4843: This is the process id number of the parent B<lond> process.
4844:
4845: =item *
4846:
4847: SIGTERM and SIGINT
4848:
4849: Parent signal assignment:
4850: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
4851:
4852: Child signal assignment:
4853: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
4854: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
4855: to restart a new child.)
4856:
4857: Command-line invocations:
4858: B<kill> B<-s> SIGTERM I<PID>
4859: B<kill> B<-s> SIGINT I<PID>
4860:
4861: Subroutine B<HUNTSMAN>:
4862: This is only invoked for the B<lond> parent I<PID>.
4863: This kills all the children, and then the parent.
4864: The B<lonc.pid> file is cleared.
4865:
4866: =item *
4867:
4868: SIGHUP
4869:
4870: Current bug:
4871: This signal can only be processed the first time
4872: on the parent process. Subsequent SIGHUP signals
4873: have no effect.
4874:
4875: Parent signal assignment:
4876: $SIG{HUP} = \&HUPSMAN;
4877:
4878: Child signal assignment:
4879: none (nothing happens)
4880:
4881: Command-line invocations:
4882: B<kill> B<-s> SIGHUP I<PID>
4883:
4884: Subroutine B<HUPSMAN>:
4885: This is only invoked for the B<lond> parent I<PID>,
4886: This kills all the children, and then the parent.
4887: The B<lond.pid> file is cleared.
4888:
4889: =item *
4890:
4891: SIGUSR1
4892:
4893: Parent signal assignment:
4894: $SIG{USR1} = \&USRMAN;
4895:
4896: Child signal assignment:
4897: $SIG{USR1}= \&logstatus;
4898:
4899: Command-line invocations:
4900: B<kill> B<-s> SIGUSR1 I<PID>
4901:
4902: Subroutine B<USRMAN>:
4903: When invoked for the B<lond> parent I<PID>,
4904: SIGUSR1 is sent to all the children, and the status of
4905: each connection is logged.
4906:
4907: =item *
4908:
4909: SIGUSR2
4910:
4911: Parent Signal assignment:
4912: $SIG{USR2} = \&UpdateHosts
4913:
4914: Child signal assignment:
4915: NONE
4916:
4917:
4918: =item *
4919:
4920: SIGCHLD
4921:
4922: Parent signal assignment:
4923: $SIG{CHLD} = \&REAPER;
4924:
4925: Child signal assignment:
4926: none
4927:
4928: Command-line invocations:
4929: B<kill> B<-s> SIGCHLD I<PID>
4930:
4931: Subroutine B<REAPER>:
4932: This is only invoked for the B<lond> parent I<PID>.
4933: Information pertaining to the child is removed.
4934: The socket port is cleaned up.
4935:
4936: =back
4937:
4938: B<SERVER-SIDE ACTIVITIES>
4939:
4940: Server-side information can be accepted in an encrypted or non-encrypted
4941: method.
4942:
4943: =over 4
4944:
4945: =item ping
4946:
4947: Query a client in the hosts.tab table; "Are you there?"
4948:
4949: =item pong
4950:
4951: Respond to a ping query.
4952:
4953: =item ekey
4954:
4955: Read in encrypted key, make cipher. Respond with a buildkey.
4956:
4957: =item load
4958:
4959: Respond with CPU load based on a computation upon /proc/loadavg.
4960:
4961: =item currentauth
4962:
4963: Reply with current authentication information (only over an
4964: encrypted channel).
4965:
4966: =item auth
4967:
4968: Only over an encrypted channel, reply as to whether a user's
4969: authentication information can be validated.
4970:
4971: =item passwd
4972:
4973: Allow for a password to be set.
4974:
4975: =item makeuser
4976:
4977: Make a user.
4978:
4979: =item passwd
4980:
4981: Allow for authentication mechanism and password to be changed.
4982:
4983: =item home
4984:
4985: Respond to a question "are you the home for a given user?"
4986:
4987: =item update
4988:
4989: Update contents of a subscribed resource.
4990:
4991: =item unsubscribe
4992:
4993: The server is unsubscribing from a resource.
4994:
4995: =item subscribe
4996:
4997: The server is subscribing to a resource.
4998:
4999: =item log
5000:
5001: Place in B<logs/lond.log>
5002:
5003: =item put
5004:
5005: stores hash in namespace
5006:
5007: =item rolesputy
5008:
5009: put a role into a user's environment
5010:
5011: =item get
5012:
5013: returns hash with keys from array
5014: reference filled in from namespace
5015:
5016: =item eget
5017:
5018: returns hash with keys from array
5019: reference filled in from namesp (encrypts the return communication)
5020:
5021: =item rolesget
5022:
5023: get a role from a user's environment
5024:
5025: =item del
5026:
5027: deletes keys out of array from namespace
5028:
5029: =item keys
5030:
5031: returns namespace keys
5032:
5033: =item dump
5034:
5035: dumps the complete (or key matching regexp) namespace into a hash
5036:
5037: =item store
5038:
5039: stores hash permanently
5040: for this url; hashref needs to be given and should be a \%hashname; the
5041: remaining args aren't required and if they aren't passed or are '' they will
5042: be derived from the ENV
5043:
5044: =item restore
5045:
5046: returns a hash for a given url
5047:
5048: =item querysend
5049:
5050: Tells client about the lonsql process that has been launched in response
5051: to a sent query.
5052:
5053: =item queryreply
5054:
5055: Accept information from lonsql and make appropriate storage in temporary
5056: file space.
5057:
5058: =item idput
5059:
5060: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
5061: for each student, defined perhaps by the institutional Registrar.)
5062:
5063: =item idget
5064:
5065: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
5066: for each student, defined perhaps by the institutional Registrar.)
5067:
5068: =item tmpput
5069:
5070: Accept and store information in temporary space.
5071:
5072: =item tmpget
5073:
5074: Send along temporarily stored information.
5075:
5076: =item ls
5077:
5078: List part of a user's directory.
5079:
5080: =item pushtable
5081:
5082: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
5083: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
5084: must be restored manually in case of a problem with the new table file.
5085: pushtable requires that the request be encrypted and validated via
5086: ValidateManager. The form of the command is:
5087: enc:pushtable tablename <tablecontents> \n
5088: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
5089: cleartext newline.
5090:
5091: =item Hanging up (exit or init)
5092:
5093: What to do when a client tells the server that they (the client)
5094: are leaving the network.
5095:
5096: =item unknown command
5097:
5098: If B<lond> is sent an unknown command (not in the list above),
5099: it replys to the client "unknown_cmd".
5100:
5101:
5102: =item UNKNOWN CLIENT
5103:
5104: If the anti-spoofing algorithm cannot verify the client,
5105: the client is rejected (with a "refused" message sent
5106: to the client, and the connection is closed.
5107:
5108: =back
5109:
5110: =head1 PREREQUISITES
5111:
5112: IO::Socket
5113: IO::File
5114: Apache::File
5115: Symbol
5116: POSIX
5117: Crypt::IDEA
5118: LWP::UserAgent()
5119: GDBM_File
5120: Authen::Krb4
5121: Authen::Krb5
5122:
5123: =head1 COREQUISITES
5124:
5125: =head1 OSNAMES
5126:
5127: linux
5128:
5129: =head1 SCRIPT CATEGORIES
5130:
5131: Server/Process
5132:
5133: =cut
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