1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.304 2005/12/10 00:46:23 raeburn 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 localstudentphoto;
50: use File::Copy;
51: use File::Find;
52: use LONCAPA::ConfigFileEdit;
53: use LONCAPA::lonlocal;
54: use LONCAPA::lonssl;
55: use Fcntl qw(:flock);
56:
57: my $DEBUG = 0; # Non zero to enable debug log entries.
58:
59: my $status='';
60: my $lastlog='';
61:
62: my $VERSION='$Revision: 1.304 $'; #' stupid emacs
63: my $remoteVERSION;
64: my $currenthostid="default";
65: my $currentdomainid;
66:
67: my $client;
68: my $clientip; # IP address of client.
69: my $clientname; # LonCAPA name of client.
70:
71: my $server;
72: my $thisserver; # DNS of us.
73:
74: my $keymode;
75:
76: my $cipher; # Cipher key negotiated with client
77: my $tmpsnum = 0; # Id of tmpputs.
78:
79: #
80: # Connection type is:
81: # client - All client actions are allowed
82: # manager - only management functions allowed.
83: # both - Both management and client actions are allowed
84: #
85:
86: my $ConnectionType;
87:
88: my %hostid; # ID's for hosts in cluster by ip.
89: my %hostdom; # LonCAPA domain for hosts in cluster.
90: my %hostip; # IPs for hosts in cluster.
91: my %hostdns; # ID's of hosts looked up by DNS name.
92:
93: my %managers; # Ip -> manager names
94:
95: my %perlvar; # Will have the apache conf defined perl vars.
96:
97: #
98: # The hash below is used for command dispatching, and is therefore keyed on the request keyword.
99: # Each element of the hash contains a reference to an array that contains:
100: # A reference to a sub that executes the request corresponding to the keyword.
101: # A flag that is true if the request must be encoded to be acceptable.
102: # A mask with bits as follows:
103: # CLIENT_OK - Set when the function is allowed by ordinary clients
104: # MANAGER_OK - Set when the function is allowed to manager clients.
105: #
106: my $CLIENT_OK = 1;
107: my $MANAGER_OK = 2;
108: my %Dispatcher;
109:
110:
111: #
112: # The array below are password error strings."
113: #
114: my $lastpwderror = 13; # Largest error number from lcpasswd.
115: my @passwderrors = ("ok",
116: "pwchange_failure - lcpasswd must be run as user 'www'",
117: "pwchange_failure - lcpasswd got incorrect number of arguments",
118: "pwchange_failure - lcpasswd did not get the right nubmer of input text lines",
119: "pwchange_failure - lcpasswd too many simultaneous pwd changes in progress",
120: "pwchange_failure - lcpasswd User does not exist.",
121: "pwchange_failure - lcpasswd Incorrect current passwd",
122: "pwchange_failure - lcpasswd Unable to su to root.",
123: "pwchange_failure - lcpasswd Cannot set new passwd.",
124: "pwchange_failure - lcpasswd Username has invalid characters",
125: "pwchange_failure - lcpasswd Invalid characters in password",
126: "pwchange_failure - lcpasswd User already exists",
127: "pwchange_failure - lcpasswd Something went wrong with user addition.",
128: "pwchange_failure - lcpasswd Password mismatch",
129: "pwchange_failure - lcpasswd Error filename is invalid");
130:
131:
132: # The array below are lcuseradd error strings.:
133:
134: my $lastadderror = 13;
135: my @adderrors = ("ok",
136: "User ID mismatch, lcuseradd must run as user www",
137: "lcuseradd Incorrect number of command line parameters must be 3",
138: "lcuseradd Incorrect number of stdinput lines, must be 3",
139: "lcuseradd Too many other simultaneous pwd changes in progress",
140: "lcuseradd User does not exist",
141: "lcuseradd Unable to make www member of users's group",
142: "lcuseradd Unable to su to root",
143: "lcuseradd Unable to set password",
144: "lcuseradd Usrname has invalid characters",
145: "lcuseradd Password has an invalid character",
146: "lcuseradd User already exists",
147: "lcuseradd Could not add user.",
148: "lcuseradd Password mismatch");
149:
150:
151:
152: #
153: # Statistics that are maintained and dislayed in the status line.
154: #
155: my $Transactions = 0; # Number of attempted transactions.
156: my $Failures = 0; # Number of transcations failed.
157:
158: # ResetStatistics:
159: # Resets the statistics counters:
160: #
161: sub ResetStatistics {
162: $Transactions = 0;
163: $Failures = 0;
164: }
165:
166: #------------------------------------------------------------------------
167: #
168: # LocalConnection
169: # Completes the formation of a locally authenticated connection.
170: # This function will ensure that the 'remote' client is really the
171: # local host. If not, the connection is closed, and the function fails.
172: # If so, initcmd is parsed for the name of a file containing the
173: # IDEA session key. The fie is opened, read, deleted and the session
174: # key returned to the caller.
175: #
176: # Parameters:
177: # $Socket - Socket open on client.
178: # $initcmd - The full text of the init command.
179: #
180: # Implicit inputs:
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: $clientip me: $thisserver");
190: if($clientip ne "127.0.0.1") {
191: &logthis('<font color="red"> LocalConnection rejecting non local: '
192: ."$clientip 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: # Safely execute a command (as long as it's not a shel command and doesn
336: # not require/rely on shell escapes. The function operates by doing a
337: # a pipe based fork and capturing stdout and stderr from the pipe.
338: #
339: # Formal Parameters:
340: # $line - A line of text to be executed as a command.
341: # Returns:
342: # The output from that command. If the output is multiline the caller
343: # must know how to split up the output.
344: #
345: #
346: sub execute_command {
347: my ($line) = @_;
348: my @words = split(/\s/, $line); # Bust the command up into words.
349: my $output = "";
350:
351: my $pid = open(CHILD, "-|");
352:
353: if($pid) { # Parent process
354: Debug("In parent process for execute_command");
355: my @data = <CHILD>; # Read the child's outupt...
356: close CHILD;
357: foreach my $output_line (@data) {
358: Debug("Adding $output_line");
359: $output .= $output_line; # Presumably has a \n on it.
360: }
361:
362: } else { # Child process
363: close (STDERR);
364: open (STDERR, ">&STDOUT");# Combine stderr, and stdout...
365: exec(@words); # won't return.
366: }
367: return $output;
368: }
369:
370:
371: # GetCertificate: Given a transaction that requires a certificate,
372: # this function will extract the certificate from the transaction
373: # request. Note that at this point, the only concept of a certificate
374: # is the hostname to which we are connected.
375: #
376: # Parameter:
377: # request - The request sent by our client (this parameterization may
378: # need to change when we really use a certificate granting
379: # authority.
380: #
381: sub GetCertificate {
382: my $request = shift;
383:
384: return $clientip;
385: }
386:
387: #
388: # Return true if client is a manager.
389: #
390: sub isManager {
391: return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
392: }
393: #
394: # Return tru if client can do client functions
395: #
396: sub isClient {
397: return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
398: }
399:
400:
401: #
402: # ReadManagerTable: Reads in the current manager table. For now this is
403: # done on each manager authentication because:
404: # - These authentications are not frequent
405: # - This allows dynamic changes to the manager table
406: # without the need to signal to the lond.
407: #
408: sub ReadManagerTable {
409:
410: # Clean out the old table first..
411:
412: foreach my $key (keys %managers) {
413: delete $managers{$key};
414: }
415:
416: my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
417: if (!open (MANAGERS, $tablename)) {
418: logthis('<font color="red">No manager table. Nobody can manage!!</font>');
419: return;
420: }
421: while(my $host = <MANAGERS>) {
422: chomp($host);
423: if ($host =~ "^#") { # Comment line.
424: next;
425: }
426: if (!defined $hostip{$host}) { # This is a non cluster member
427: # The entry is of the form:
428: # cluname:hostname
429: # cluname - A 'cluster hostname' is needed in order to negotiate
430: # the host key.
431: # hostname- The dns name of the host.
432: #
433: my($cluname, $dnsname) = split(/:/, $host);
434:
435: my $ip = gethostbyname($dnsname);
436: if(defined($ip)) { # bad names don't deserve entry.
437: my $hostip = inet_ntoa($ip);
438: $managers{$hostip} = $cluname;
439: logthis('<font color="green"> registering manager '.
440: "$dnsname as $cluname with $hostip </font>\n");
441: }
442: } else {
443: logthis('<font color="green"> existing host'." $host</font>\n");
444: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber
445: }
446: }
447: }
448:
449: #
450: # ValidManager: Determines if a given certificate represents a valid manager.
451: # in this primitive implementation, the 'certificate' is
452: # just the connecting loncapa client name. This is checked
453: # against a valid client list in the configuration.
454: #
455: #
456: sub ValidManager {
457: my $certificate = shift;
458:
459: return isManager;
460: }
461: #
462: # CopyFile: Called as part of the process of installing a
463: # new configuration file. This function copies an existing
464: # file to a backup file.
465: # Parameters:
466: # oldfile - Name of the file to backup.
467: # newfile - Name of the backup file.
468: # Return:
469: # 0 - Failure (errno has failure reason).
470: # 1 - Success.
471: #
472: sub CopyFile {
473:
474: my ($oldfile, $newfile) = @_;
475:
476: if (! copy($oldfile,$newfile)) {
477: return 0;
478: }
479: chmod(0660, $newfile);
480: return 1;
481: }
482: #
483: # Host files are passed out with externally visible host IPs.
484: # If, for example, we are behind a fire-wall or NAT host, our
485: # internally visible IP may be different than the externally
486: # visible IP. Therefore, we always adjust the contents of the
487: # host file so that the entry for ME is the IP that we believe
488: # we have. At present, this is defined as the entry that
489: # DNS has for us. If by some chance we are not able to get a
490: # DNS translation for us, then we assume that the host.tab file
491: # is correct.
492: # BUGBUGBUG - in the future, we really should see if we can
493: # easily query the interface(s) instead.
494: # Parameter(s):
495: # contents - The contents of the host.tab to check.
496: # Returns:
497: # newcontents - The adjusted contents.
498: #
499: #
500: sub AdjustHostContents {
501: my $contents = shift;
502: my $adjusted;
503: my $me = $perlvar{'lonHostID'};
504:
505: foreach my $line (split(/\n/,$contents)) {
506: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
507: chomp($line);
508: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
509: if ($id eq $me) {
510: my $ip = gethostbyname($name);
511: my $ipnew = inet_ntoa($ip);
512: $ip = $ipnew;
513: # Reconstruct the host line and append to adjusted:
514:
515: my $newline = "$id:$domain:$role:$name:$ip";
516: if($maxcon ne "") { # Not all hosts have loncnew tuning params
517: $newline .= ":$maxcon:$idleto:$mincon";
518: }
519: $adjusted .= $newline."\n";
520:
521: } else { # Not me, pass unmodified.
522: $adjusted .= $line."\n";
523: }
524: } else { # Blank or comment never re-written.
525: $adjusted .= $line."\n"; # Pass blanks and comments as is.
526: }
527: }
528: return $adjusted;
529: }
530: #
531: # InstallFile: Called to install an administrative file:
532: # - The file is created with <name>.tmp
533: # - The <name>.tmp file is then mv'd to <name>
534: # This lugubrious procedure is done to ensure that we are never without
535: # a valid, even if dated, version of the file regardless of who crashes
536: # and when the crash occurs.
537: #
538: # Parameters:
539: # Name of the file
540: # File Contents.
541: # Return:
542: # nonzero - success.
543: # 0 - failure and $! has an errno.
544: #
545: sub InstallFile {
546:
547: my ($Filename, $Contents) = @_;
548: my $TempFile = $Filename.".tmp";
549:
550: # Open the file for write:
551:
552: my $fh = IO::File->new("> $TempFile"); # Write to temp.
553: if(!(defined $fh)) {
554: &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
555: return 0;
556: }
557: # write the contents of the file:
558:
559: print $fh ($Contents);
560: $fh->close; # In case we ever have a filesystem w. locking
561:
562: chmod(0660, $TempFile);
563:
564: # Now we can move install the file in position.
565:
566: move($TempFile, $Filename);
567:
568: return 1;
569: }
570:
571:
572: #
573: # ConfigFileFromSelector: converts a configuration file selector
574: # (one of host or domain at this point) into a
575: # configuration file pathname.
576: #
577: # Parameters:
578: # selector - Configuration file selector.
579: # Returns:
580: # Full path to the file or undef if the selector is invalid.
581: #
582: sub ConfigFileFromSelector {
583: my $selector = shift;
584: my $tablefile;
585:
586: my $tabledir = $perlvar{'lonTabDir'}.'/';
587: if ($selector eq "hosts") {
588: $tablefile = $tabledir."hosts.tab";
589: } elsif ($selector eq "domain") {
590: $tablefile = $tabledir."domain.tab";
591: } else {
592: return undef;
593: }
594: return $tablefile;
595:
596: }
597: #
598: # PushFile: Called to do an administrative push of a file.
599: # - Ensure the file being pushed is one we support.
600: # - Backup the old file to <filename.saved>
601: # - Separate the contents of the new file out from the
602: # rest of the request.
603: # - Write the new file.
604: # Parameter:
605: # Request - The entire user request. This consists of a : separated
606: # string pushfile:tablename:contents.
607: # NOTE: The contents may have :'s in it as well making things a bit
608: # more interesting... but not much.
609: # Returns:
610: # String to send to client ("ok" or "refused" if bad file).
611: #
612: sub PushFile {
613: my $request = shift;
614: my ($command, $filename, $contents) = split(":", $request, 3);
615:
616: # At this point in time, pushes for only the following tables are
617: # supported:
618: # hosts.tab ($filename eq host).
619: # domain.tab ($filename eq domain).
620: # Construct the destination filename or reject the request.
621: #
622: # lonManage is supposed to ensure this, however this session could be
623: # part of some elaborate spoof that managed somehow to authenticate.
624: #
625:
626:
627: my $tablefile = ConfigFileFromSelector($filename);
628: if(! (defined $tablefile)) {
629: return "refused";
630: }
631: #
632: # >copy< the old table to the backup table
633: # don't rename in case system crashes/reboots etc. in the time
634: # window between a rename and write.
635: #
636: my $backupfile = $tablefile;
637: $backupfile =~ s/\.tab$/.old/;
638: if(!CopyFile($tablefile, $backupfile)) {
639: &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
640: return "error:$!";
641: }
642: &logthis('<font color="green"> Pushfile: backed up '
643: .$tablefile." to $backupfile</font>");
644:
645: # If the file being pushed is the host file, we adjust the entry for ourself so that the
646: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible
647: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a
648: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
649: # that possibilty.
650:
651: if($filename eq "host") {
652: $contents = AdjustHostContents($contents);
653: }
654:
655: # Install the new file:
656:
657: if(!InstallFile($tablefile, $contents)) {
658: &logthis('<font color="red"> Pushfile: unable to install '
659: .$tablefile." $! </font>");
660: return "error:$!";
661: } else {
662: &logthis('<font color="green"> Installed new '.$tablefile
663: ."</font>");
664:
665: }
666:
667:
668: # Indicate success:
669:
670: return "ok";
671:
672: }
673:
674: #
675: # Called to re-init either lonc or lond.
676: #
677: # Parameters:
678: # request - The full request by the client. This is of the form
679: # reinit:<process>
680: # where <process> is allowed to be either of
681: # lonc or lond
682: #
683: # Returns:
684: # The string to be sent back to the client either:
685: # ok - Everything worked just fine.
686: # error:why - There was a failure and why describes the reason.
687: #
688: #
689: sub ReinitProcess {
690: my $request = shift;
691:
692:
693: # separate the request (reinit) from the process identifier and
694: # validate it producing the name of the .pid file for the process.
695: #
696: #
697: my ($junk, $process) = split(":", $request);
698: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
699: if($process eq 'lonc') {
700: $processpidfile = $processpidfile."lonc.pid";
701: if (!open(PIDFILE, "< $processpidfile")) {
702: return "error:Open failed for $processpidfile";
703: }
704: my $loncpid = <PIDFILE>;
705: close(PIDFILE);
706: logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
707: ."</font>");
708: kill("USR2", $loncpid);
709: } elsif ($process eq 'lond') {
710: logthis('<font color="red"> Reinitializing self (lond) </font>');
711: &UpdateHosts; # Lond is us!!
712: } else {
713: &logthis('<font color="yellow" Invalid reinit request for '.$process
714: ."</font>");
715: return "error:Invalid process identifier $process";
716: }
717: return 'ok';
718: }
719: # Validate a line in a configuration file edit script:
720: # Validation includes:
721: # - Ensuring the command is valid.
722: # - Ensuring the command has sufficient parameters
723: # Parameters:
724: # scriptline - A line to validate (\n has been stripped for what it's worth).
725: #
726: # Return:
727: # 0 - Invalid scriptline.
728: # 1 - Valid scriptline
729: # NOTE:
730: # Only the command syntax is checked, not the executability of the
731: # command.
732: #
733: sub isValidEditCommand {
734: my $scriptline = shift;
735:
736: # Line elements are pipe separated:
737:
738: my ($command, $key, $newline) = split(/\|/, $scriptline);
739: &logthis('<font color="green"> isValideditCommand checking: '.
740: "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
741:
742: if ($command eq "delete") {
743: #
744: # key with no newline.
745: #
746: if( ($key eq "") || ($newline ne "")) {
747: return 0; # Must have key but no newline.
748: } else {
749: return 1; # Valid syntax.
750: }
751: } elsif ($command eq "replace") {
752: #
753: # key and newline:
754: #
755: if (($key eq "") || ($newline eq "")) {
756: return 0;
757: } else {
758: return 1;
759: }
760: } elsif ($command eq "append") {
761: if (($key ne "") && ($newline eq "")) {
762: return 1;
763: } else {
764: return 0;
765: }
766: } else {
767: return 0; # Invalid command.
768: }
769: return 0; # Should not get here!!!
770: }
771: #
772: # ApplyEdit - Applies an edit command to a line in a configuration
773: # file. It is the caller's responsiblity to validate the
774: # edit line.
775: # Parameters:
776: # $directive - A single edit directive to apply.
777: # Edit directives are of the form:
778: # append|newline - Appends a new line to the file.
779: # replace|key|newline - Replaces the line with key value 'key'
780: # delete|key - Deletes the line with key value 'key'.
781: # $editor - A config file editor object that contains the
782: # file being edited.
783: #
784: sub ApplyEdit {
785:
786: my ($directive, $editor) = @_;
787:
788: # Break the directive down into its command and its parameters
789: # (at most two at this point. The meaning of the parameters, if in fact
790: # they exist depends on the command).
791:
792: my ($command, $p1, $p2) = split(/\|/, $directive);
793:
794: if($command eq "append") {
795: $editor->Append($p1); # p1 - key p2 null.
796: } elsif ($command eq "replace") {
797: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline.
798: } elsif ($command eq "delete") {
799: $editor->DeleteLine($p1); # p1 - key p2 null.
800: } else { # Should not get here!!!
801: die "Invalid command given to ApplyEdit $command"
802: }
803: }
804: #
805: # AdjustOurHost:
806: # Adjusts a host file stored in a configuration file editor object
807: # for the true IP address of this host. This is necessary for hosts
808: # that live behind a firewall.
809: # Those hosts have a publicly distributed IP of the firewall, but
810: # internally must use their actual IP. We assume that a given
811: # host only has a single IP interface for now.
812: # Formal Parameters:
813: # editor - The configuration file editor to adjust. This
814: # editor is assumed to contain a hosts.tab file.
815: # Strategy:
816: # - Figure out our hostname.
817: # - Lookup the entry for this host.
818: # - Modify the line to contain our IP
819: # - Do a replace for this host.
820: sub AdjustOurHost {
821: my $editor = shift;
822:
823: # figure out who I am.
824:
825: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname.
826:
827: # Get my host file entry.
828:
829: my $ConfigLine = $editor->Find($myHostName);
830: if(! (defined $ConfigLine)) {
831: die "AdjustOurHost - no entry for me in hosts file $myHostName";
832: }
833: # figure out my IP:
834: # Use the config line to get my hostname.
835: # Use gethostbyname to translate that into an IP address.
836: #
837: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
838: my $BinaryIp = gethostbyname($name);
839: my $ip = inet_ntoa($ip);
840: #
841: # Reassemble the config line from the elements in the list.
842: # Note that if the loncnew items were not present before, they will
843: # be now even if they would be empty
844: #
845: my $newConfigLine = $id;
846: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
847: $newConfigLine .= ":".$item;
848: }
849: # Replace the line:
850:
851: $editor->ReplaceLine($id, $newConfigLine);
852:
853: }
854: #
855: # ReplaceConfigFile:
856: # Replaces a configuration file with the contents of a
857: # configuration file editor object.
858: # This is done by:
859: # - Copying the target file to <filename>.old
860: # - Writing the new file to <filename>.tmp
861: # - Moving <filename.tmp> -> <filename>
862: # This laborious process ensures that the system is never without
863: # a configuration file that's at least valid (even if the contents
864: # may be dated).
865: # Parameters:
866: # filename - Name of the file to modify... this is a full path.
867: # editor - Editor containing the file.
868: #
869: sub ReplaceConfigFile {
870:
871: my ($filename, $editor) = @_;
872:
873: CopyFile ($filename, $filename.".old");
874:
875: my $contents = $editor->Get(); # Get the contents of the file.
876:
877: InstallFile($filename, $contents);
878: }
879: #
880: #
881: # Called to edit a configuration table file
882: # Parameters:
883: # request - The entire command/request sent by lonc or lonManage
884: # Return:
885: # The reply to send to the client.
886: #
887: sub EditFile {
888: my $request = shift;
889:
890: # Split the command into it's pieces: edit:filetype:script
891:
892: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script
893:
894: # Check the pre-coditions for success:
895:
896: if($request != "edit") { # Something is amiss afoot alack.
897: return "error:edit request detected, but request != 'edit'\n";
898: }
899: if( ($filetype ne "hosts") &&
900: ($filetype ne "domain")) {
901: return "error:edit requested with invalid file specifier: $filetype \n";
902: }
903:
904: # Split the edit script and check it's validity.
905:
906: my @scriptlines = split(/\n/, $script); # one line per element.
907: my $linecount = scalar(@scriptlines);
908: for(my $i = 0; $i < $linecount; $i++) {
909: chomp($scriptlines[$i]);
910: if(!isValidEditCommand($scriptlines[$i])) {
911: return "error:edit with bad script line: '$scriptlines[$i]' \n";
912: }
913: }
914:
915: # Execute the edit operation.
916: # - Create a config file editor for the appropriate file and
917: # - execute each command in the script:
918: #
919: my $configfile = ConfigFileFromSelector($filetype);
920: if (!(defined $configfile)) {
921: return "refused\n";
922: }
923: my $editor = ConfigFileEdit->new($configfile);
924:
925: for (my $i = 0; $i < $linecount; $i++) {
926: ApplyEdit($scriptlines[$i], $editor);
927: }
928: # If the file is the host file, ensure that our host is
929: # adjusted to have our ip:
930: #
931: if($filetype eq "host") {
932: AdjustOurHost($editor);
933: }
934: # Finally replace the current file with our file.
935: #
936: ReplaceConfigFile($configfile, $editor);
937:
938: return "ok\n";
939: }
940:
941: #---------------------------------------------------------------
942: #
943: # Manipulation of hash based databases (factoring out common code
944: # for later use as we refactor.
945: #
946: # Ties a domain level resource file to a hash.
947: # If requested a history entry is created in the associated hist file.
948: #
949: # Parameters:
950: # domain - Name of the domain in which the resource file lives.
951: # namespace - Name of the hash within that domain.
952: # how - How to tie the hash (e.g. GDBM_WRCREAT()).
953: # loghead - Optional parameter, if present a log entry is created
954: # in the associated history file and this is the first part
955: # of that entry.
956: # logtail - Goes along with loghead, The actual logentry is of the
957: # form $loghead:<timestamp>:logtail.
958: # Returns:
959: # Reference to a hash bound to the db file or alternatively undef
960: # if the tie failed.
961: #
962: sub tie_domain_hash {
963: my ($domain,$namespace,$how,$loghead,$logtail) = @_;
964:
965: # Filter out any whitespace in the domain name:
966:
967: $domain =~ s/\W//g;
968:
969: # We have enough to go on to tie the hash:
970:
971: my $user_top_dir = $perlvar{'lonUsersDir'};
972: my $domain_dir = $user_top_dir."/$domain";
973: my $resource_file = $domain_dir."/$namespace.db";
974: my %hash;
975: if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) {
976: if (defined($loghead)) { # Need to log the operation.
977: my $logFh = IO::File->new(">>$domain_dir/$namespace.hist");
978: if($logFh) {
979: my $timestamp = time;
980: print $logFh "$loghead:$timestamp:$logtail\n";
981: }
982: $logFh->close;
983: }
984: return \%hash; # Return the tied hash.
985: } else {
986: return undef; # Tie failed.
987: }
988: }
989:
990: #
991: # Ties a user's resource file to a hash.
992: # If necessary, an appropriate history
993: # log file entry is made as well.
994: # This sub factors out common code from the subs that manipulate
995: # the various gdbm files that keep keyword value pairs.
996: # Parameters:
997: # domain - Name of the domain the user is in.
998: # user - Name of the 'current user'.
999: # namespace - Namespace representing the file to tie.
1000: # how - What the tie is done to (e.g. GDBM_WRCREAT().
1001: # loghead - Optional first part of log entry if there may be a
1002: # history file.
1003: # what - Optional tail of log entry if there may be a history
1004: # file.
1005: # Returns:
1006: # hash to which the database is tied. It's up to the caller to untie.
1007: # undef if the has could not be tied.
1008: #
1009: sub tie_user_hash {
1010: my ($domain,$user,$namespace,$how,$loghead,$what) = @_;
1011:
1012: $namespace=~s/\//\_/g; # / -> _
1013: $namespace=~s/\W//g; # whitespace eliminated.
1014: my $proname = propath($domain, $user);
1015:
1016: # Tie the database.
1017:
1018: my %hash;
1019: if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",
1020: $how, 0640)) {
1021: # If this is a namespace for which a history is kept,
1022: # make the history log entry:
1023: if (($namespace !~/^nohist\_/) && (defined($loghead))) {
1024: my $args = scalar @_;
1025: Debug(" Opening history: $namespace $args");
1026: my $hfh = IO::File->new(">>$proname/$namespace.hist");
1027: if($hfh) {
1028: my $now = time;
1029: print $hfh "$loghead:$now:$what\n";
1030: }
1031: $hfh->close;
1032: }
1033: return \%hash;
1034: } else {
1035: return undef;
1036: }
1037:
1038: }
1039:
1040: # read_profile
1041: #
1042: # Returns a set of specific entries from a user's profile file.
1043: # this is a utility function that is used by both get_profile_entry and
1044: # get_profile_entry_encrypted.
1045: #
1046: # Parameters:
1047: # udom - Domain in which the user exists.
1048: # uname - User's account name (loncapa account)
1049: # namespace - The profile namespace to open.
1050: # what - A set of & separated queries.
1051: # Returns:
1052: # If all ok: - The string that needs to be shipped back to the user.
1053: # If failure - A string that starts with error: followed by the failure
1054: # reason.. note that this probabyl gets shipped back to the
1055: # user as well.
1056: #
1057: sub read_profile {
1058: my ($udom, $uname, $namespace, $what) = @_;
1059:
1060: my $hashref = &tie_user_hash($udom, $uname, $namespace,
1061: &GDBM_READER());
1062: if ($hashref) {
1063: my @queries=split(/\&/,$what);
1064: my $qresult='';
1065:
1066: for (my $i=0;$i<=$#queries;$i++) {
1067: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string.
1068: }
1069: $qresult=~s/\&$//; # Remove trailing & from last lookup.
1070: if (untie %$hashref) {
1071: return $qresult;
1072: } else {
1073: return "error: ".($!+0)." untie (GDBM) Failed";
1074: }
1075: } else {
1076: if ($!+0 == 2) {
1077: return "error:No such file or GDBM reported bad block error";
1078: } else {
1079: return "error: ".($!+0)." tie (GDBM) Failed";
1080: }
1081: }
1082:
1083: }
1084: #--------------------- Request Handlers --------------------------------------------
1085: #
1086: # By convention each request handler registers itself prior to the sub
1087: # declaration:
1088: #
1089:
1090: #++
1091: #
1092: # Handles ping requests.
1093: # Parameters:
1094: # $cmd - the actual keyword that invoked us.
1095: # $tail - the tail of the request that invoked us.
1096: # $replyfd- File descriptor connected to the client
1097: # Implicit Inputs:
1098: # $currenthostid - Global variable that carries the name of the host we are
1099: # known as.
1100: # Returns:
1101: # 1 - Ok to continue processing.
1102: # 0 - Program should exit.
1103: # Side effects:
1104: # Reply information is sent to the client.
1105: sub ping_handler {
1106: my ($cmd, $tail, $client) = @_;
1107: Debug("$cmd $tail $client .. $currenthostid:");
1108:
1109: Reply( $client,"$currenthostid\n","$cmd:$tail");
1110:
1111: return 1;
1112: }
1113: ®ister_handler("ping", \&ping_handler, 0, 1, 1); # Ping unencoded, client or manager.
1114:
1115: #++
1116: #
1117: # Handles pong requests. Pong replies with our current host id, and
1118: # the results of a ping sent to us via our lonc.
1119: #
1120: # Parameters:
1121: # $cmd - the actual keyword that invoked us.
1122: # $tail - the tail of the request that invoked us.
1123: # $replyfd- File descriptor connected to the client
1124: # Implicit Inputs:
1125: # $currenthostid - Global variable that carries the name of the host we are
1126: # connected to.
1127: # Returns:
1128: # 1 - Ok to continue processing.
1129: # 0 - Program should exit.
1130: # Side effects:
1131: # Reply information is sent to the client.
1132: sub pong_handler {
1133: my ($cmd, $tail, $replyfd) = @_;
1134:
1135: my $reply=&reply("ping",$clientname);
1136: &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
1137: return 1;
1138: }
1139: ®ister_handler("pong", \&pong_handler, 0, 1, 1); # Pong unencoded, client or manager
1140:
1141: #++
1142: # Called to establish an encrypted session key with the remote client.
1143: # Note that with secure lond, in most cases this function is never
1144: # invoked. Instead, the secure session key is established either
1145: # via a local file that's locked down tight and only lives for a short
1146: # time, or via an ssl tunnel...and is generated from a bunch-o-random
1147: # bits from /dev/urandom, rather than the predictable pattern used by
1148: # by this sub. This sub is only used in the old-style insecure
1149: # key negotiation.
1150: # Parameters:
1151: # $cmd - the actual keyword that invoked us.
1152: # $tail - the tail of the request that invoked us.
1153: # $replyfd- File descriptor connected to the client
1154: # Implicit Inputs:
1155: # $currenthostid - Global variable that carries the name of the host
1156: # known as.
1157: # $clientname - Global variable that carries the name of the hsot we're connected to.
1158: # Returns:
1159: # 1 - Ok to continue processing.
1160: # 0 - Program should exit.
1161: # Implicit Outputs:
1162: # Reply information is sent to the client.
1163: # $cipher is set with a reference to a new IDEA encryption object.
1164: #
1165: sub establish_key_handler {
1166: my ($cmd, $tail, $replyfd) = @_;
1167:
1168: my $buildkey=time.$$.int(rand 100000);
1169: $buildkey=~tr/1-6/A-F/;
1170: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
1171: my $key=$currenthostid.$clientname;
1172: $key=~tr/a-z/A-Z/;
1173: $key=~tr/G-P/0-9/;
1174: $key=~tr/Q-Z/0-9/;
1175: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
1176: $key=substr($key,0,32);
1177: my $cipherkey=pack("H32",$key);
1178: $cipher=new IDEA $cipherkey;
1179: &Reply($replyfd, "$buildkey\n", "$cmd:$tail");
1180:
1181: return 1;
1182:
1183: }
1184: ®ister_handler("ekey", \&establish_key_handler, 0, 1,1);
1185:
1186: # Handler for the load command. Returns the current system load average
1187: # to the requestor.
1188: #
1189: # Parameters:
1190: # $cmd - the actual keyword that invoked us.
1191: # $tail - the tail of the request that invoked us.
1192: # $replyfd- File descriptor connected to the client
1193: # Implicit Inputs:
1194: # $currenthostid - Global variable that carries the name of the host
1195: # known as.
1196: # $clientname - Global variable that carries the name of the hsot we're connected to.
1197: # Returns:
1198: # 1 - Ok to continue processing.
1199: # 0 - Program should exit.
1200: # Side effects:
1201: # Reply information is sent to the client.
1202: sub load_handler {
1203: my ($cmd, $tail, $replyfd) = @_;
1204:
1205: # Get the load average from /proc/loadavg and calculate it as a percentage of
1206: # the allowed load limit as set by the perl global variable lonLoadLim
1207:
1208: my $loadavg;
1209: my $loadfile=IO::File->new('/proc/loadavg');
1210:
1211: $loadavg=<$loadfile>;
1212: $loadavg =~ s/\s.*//g; # Extract the first field only.
1213:
1214: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
1215:
1216: &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
1217:
1218: return 1;
1219: }
1220: ®ister_handler("load", \&load_handler, 0, 1, 0);
1221:
1222: #
1223: # Process the userload request. This sub returns to the client the current
1224: # user load average. It can be invoked either by clients or managers.
1225: #
1226: # Parameters:
1227: # $cmd - the actual keyword that invoked us.
1228: # $tail - the tail of the request that invoked us.
1229: # $replyfd- File descriptor connected to the client
1230: # Implicit Inputs:
1231: # $currenthostid - Global variable that carries the name of the host
1232: # known as.
1233: # $clientname - Global variable that carries the name of the hsot we're connected to.
1234: # Returns:
1235: # 1 - Ok to continue processing.
1236: # 0 - Program should exit
1237: # Implicit inputs:
1238: # whatever the userload() function requires.
1239: # Implicit outputs:
1240: # the reply is written to the client.
1241: #
1242: sub user_load_handler {
1243: my ($cmd, $tail, $replyfd) = @_;
1244:
1245: my $userloadpercent=&userload();
1246: &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
1247:
1248: return 1;
1249: }
1250: ®ister_handler("userload", \&user_load_handler, 0, 1, 0);
1251:
1252: # Process a request for the authorization type of a user:
1253: # (userauth).
1254: #
1255: # Parameters:
1256: # $cmd - the actual keyword that invoked us.
1257: # $tail - the tail of the request that invoked us.
1258: # $replyfd- File descriptor connected to the client
1259: # Returns:
1260: # 1 - Ok to continue processing.
1261: # 0 - Program should exit
1262: # Implicit outputs:
1263: # The user authorization type is written to the client.
1264: #
1265: sub user_authorization_type {
1266: my ($cmd, $tail, $replyfd) = @_;
1267:
1268: my $userinput = "$cmd:$tail";
1269:
1270: # Pull the domain and username out of the command tail.
1271: # and call get_auth_type to determine the authentication type.
1272:
1273: my ($udom,$uname)=split(/:/,$tail);
1274: my $result = &get_auth_type($udom, $uname);
1275: if($result eq "nouser") {
1276: &Failure( $replyfd, "unknown_user\n", $userinput);
1277: } else {
1278: #
1279: # We only want to pass the second field from get_auth_type
1280: # for ^krb.. otherwise we'll be handing out the encrypted
1281: # password for internals e.g.
1282: #
1283: my ($type,$otherinfo) = split(/:/,$result);
1284: if($type =~ /^krb/) {
1285: $type = $result;
1286: } else {
1287: $type .= ':';
1288: }
1289: &Reply( $replyfd, "$type\n", $userinput);
1290: }
1291:
1292: return 1;
1293: }
1294: ®ister_handler("currentauth", \&user_authorization_type, 1, 1, 0);
1295:
1296: # Process a request by a manager to push a hosts or domain table
1297: # to us. We pick apart the command and pass it on to the subs
1298: # that already exist to do this.
1299: #
1300: # Parameters:
1301: # $cmd - the actual keyword that invoked us.
1302: # $tail - the tail of the request that invoked us.
1303: # $client - File descriptor connected to the client
1304: # Returns:
1305: # 1 - Ok to continue processing.
1306: # 0 - Program should exit
1307: # Implicit Output:
1308: # a reply is written to the client.
1309: sub push_file_handler {
1310: my ($cmd, $tail, $client) = @_;
1311:
1312: my $userinput = "$cmd:$tail";
1313:
1314: # At this time we only know that the IP of our partner is a valid manager
1315: # the code below is a hook to do further authentication (e.g. to resolve
1316: # spoofing).
1317:
1318: my $cert = &GetCertificate($userinput);
1319: if(&ValidManager($cert)) {
1320:
1321: # Now presumably we have the bona fides of both the peer host and the
1322: # process making the request.
1323:
1324: my $reply = &PushFile($userinput);
1325: &Reply($client, "$reply\n", $userinput);
1326:
1327: } else {
1328: &Failure( $client, "refused\n", $userinput);
1329: }
1330: return 1;
1331: }
1332: ®ister_handler("pushfile", \&push_file_handler, 1, 0, 1);
1333:
1334: #
1335: # du - list the disk usuage of a directory recursively.
1336: #
1337: # note: stolen code from the ls file handler
1338: # under construction by Rick Banghart
1339: # .
1340: # Parameters:
1341: # $cmd - The command that dispatched us (du).
1342: # $ududir - The directory path to list... I'm not sure what this
1343: # is relative as things like ls:. return e.g.
1344: # no_such_dir.
1345: # $client - Socket open on the client.
1346: # Returns:
1347: # 1 - indicating that the daemon should not disconnect.
1348: # Side Effects:
1349: # The reply is written to $client.
1350: #
1351: sub du_handler {
1352: my ($cmd, $ududir, $client) = @_;
1353: my ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
1354: my $userinput = "$cmd:$ududir";
1355:
1356: if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
1357: &Failure($client,"refused\n","$cmd:$ududir");
1358: return 1;
1359: }
1360: # Since $ududir could have some nasties in it,
1361: # we will require that ududir is a valid
1362: # directory. Just in case someone tries to
1363: # slip us a line like .;(cd /home/httpd rm -rf*)
1364: # etc.
1365: #
1366: if (-d $ududir) {
1367: my $total_size=0;
1368: my $code=sub {
1369: if ($_=~/\.\d+\./) { return;}
1370: if ($_=~/\.meta$/) { return;}
1371: $total_size+=(stat($_))[7];
1372: };
1373: chdir($ududir);
1374: find($code,$ududir);
1375: $total_size=int($total_size/1024);
1376: &Reply($client,"$total_size\n","$cmd:$ududir");
1377: } else {
1378: &Failure($client, "bad_directory:$ududir\n","$cmd:$ududir");
1379: }
1380: return 1;
1381: }
1382: ®ister_handler("du", \&du_handler, 0, 1, 0);
1383:
1384: #
1385: # The ls_handler routine should be considered obosolete and is retained
1386: # for communication with legacy servers. Please see the ls2_handler.
1387: #
1388: # ls - list the contents of a directory. For each file in the
1389: # selected directory the filename followed by the full output of
1390: # the stat function is returned. The returned info for each
1391: # file are separated by ':'. The stat fields are separated by &'s.
1392: # Parameters:
1393: # $cmd - The command that dispatched us (ls).
1394: # $ulsdir - The directory path to list... I'm not sure what this
1395: # is relative as things like ls:. return e.g.
1396: # no_such_dir.
1397: # $client - Socket open on the client.
1398: # Returns:
1399: # 1 - indicating that the daemon should not disconnect.
1400: # Side Effects:
1401: # The reply is written to $client.
1402: #
1403: sub ls_handler {
1404: # obsoleted by ls2_handler
1405: my ($cmd, $ulsdir, $client) = @_;
1406:
1407: my $userinput = "$cmd:$ulsdir";
1408:
1409: my $obs;
1410: my $rights;
1411: my $ulsout='';
1412: my $ulsfn;
1413: if (-e $ulsdir) {
1414: if(-d $ulsdir) {
1415: if (opendir(LSDIR,$ulsdir)) {
1416: while ($ulsfn=readdir(LSDIR)) {
1417: undef($obs);
1418: undef($rights);
1419: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1420: #We do some obsolete checking here
1421: if(-e $ulsdir.'/'.$ulsfn.".meta") {
1422: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
1423: my @obsolete=<FILE>;
1424: foreach my $obsolete (@obsolete) {
1425: if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
1426: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
1427: }
1428: }
1429: $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
1430: if($obs eq '1') { $ulsout.="&1"; }
1431: else { $ulsout.="&0"; }
1432: if($rights eq '1') { $ulsout.="&1:"; }
1433: else { $ulsout.="&0:"; }
1434: }
1435: closedir(LSDIR);
1436: }
1437: } else {
1438: my @ulsstats=stat($ulsdir);
1439: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1440: }
1441: } else {
1442: $ulsout='no_such_dir';
1443: }
1444: if ($ulsout eq '') { $ulsout='empty'; }
1445: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1446:
1447: return 1;
1448:
1449: }
1450: ®ister_handler("ls", \&ls_handler, 0, 1, 0);
1451:
1452: #
1453: # Please also see the ls_handler, which this routine obosolets.
1454: # ls2_handler differs from ls_handler in that it escapes its return
1455: # values before concatenating them together with ':'s.
1456: #
1457: # ls2 - list the contents of a directory. For each file in the
1458: # selected directory the filename followed by the full output of
1459: # the stat function is returned. The returned info for each
1460: # file are separated by ':'. The stat fields are separated by &'s.
1461: # Parameters:
1462: # $cmd - The command that dispatched us (ls).
1463: # $ulsdir - The directory path to list... I'm not sure what this
1464: # is relative as things like ls:. return e.g.
1465: # no_such_dir.
1466: # $client - Socket open on the client.
1467: # Returns:
1468: # 1 - indicating that the daemon should not disconnect.
1469: # Side Effects:
1470: # The reply is written to $client.
1471: #
1472: sub ls2_handler {
1473: my ($cmd, $ulsdir, $client) = @_;
1474:
1475: my $userinput = "$cmd:$ulsdir";
1476:
1477: my $obs;
1478: my $rights;
1479: my $ulsout='';
1480: my $ulsfn;
1481: if (-e $ulsdir) {
1482: if(-d $ulsdir) {
1483: if (opendir(LSDIR,$ulsdir)) {
1484: while ($ulsfn=readdir(LSDIR)) {
1485: undef($obs);
1486: undef($rights);
1487: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1488: #We do some obsolete checking here
1489: if(-e $ulsdir.'/'.$ulsfn.".meta") {
1490: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
1491: my @obsolete=<FILE>;
1492: foreach my $obsolete (@obsolete) {
1493: if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
1494: if($obsolete =~ m|(<copyright>)(default)|) {
1495: $rights = 1;
1496: }
1497: }
1498: }
1499: my $tmp = $ulsfn.'&'.join('&',@ulsstats);
1500: if ($obs eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
1501: if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
1502: $ulsout.= &escape($tmp).':';
1503: }
1504: closedir(LSDIR);
1505: }
1506: } else {
1507: my @ulsstats=stat($ulsdir);
1508: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1509: }
1510: } else {
1511: $ulsout='no_such_dir';
1512: }
1513: if ($ulsout eq '') { $ulsout='empty'; }
1514: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1515: return 1;
1516: }
1517: ®ister_handler("ls2", \&ls2_handler, 0, 1, 0);
1518:
1519: # Process a reinit request. Reinit requests that either
1520: # lonc or lond be reinitialized so that an updated
1521: # host.tab or domain.tab can be processed.
1522: #
1523: # Parameters:
1524: # $cmd - the actual keyword that invoked us.
1525: # $tail - the tail of the request that invoked us.
1526: # $client - File descriptor connected to the client
1527: # Returns:
1528: # 1 - Ok to continue processing.
1529: # 0 - Program should exit
1530: # Implicit output:
1531: # a reply is sent to the client.
1532: #
1533: sub reinit_process_handler {
1534: my ($cmd, $tail, $client) = @_;
1535:
1536: my $userinput = "$cmd:$tail";
1537:
1538: my $cert = &GetCertificate($userinput);
1539: if(&ValidManager($cert)) {
1540: chomp($userinput);
1541: my $reply = &ReinitProcess($userinput);
1542: &Reply( $client, "$reply\n", $userinput);
1543: } else {
1544: &Failure( $client, "refused\n", $userinput);
1545: }
1546: return 1;
1547: }
1548: ®ister_handler("reinit", \&reinit_process_handler, 1, 0, 1);
1549:
1550: # Process the editing script for a table edit operation.
1551: # the editing operation must be encrypted and requested by
1552: # a manager host.
1553: #
1554: # Parameters:
1555: # $cmd - the actual keyword that invoked us.
1556: # $tail - the tail of the request that invoked us.
1557: # $client - File descriptor connected to the client
1558: # Returns:
1559: # 1 - Ok to continue processing.
1560: # 0 - Program should exit
1561: # Implicit output:
1562: # a reply is sent to the client.
1563: #
1564: sub edit_table_handler {
1565: my ($command, $tail, $client) = @_;
1566:
1567: my $userinput = "$command:$tail";
1568:
1569: my $cert = &GetCertificate($userinput);
1570: if(&ValidManager($cert)) {
1571: my($filetype, $script) = split(/:/, $tail);
1572: if (($filetype eq "hosts") ||
1573: ($filetype eq "domain")) {
1574: if($script ne "") {
1575: &Reply($client, # BUGBUG - EditFile
1576: &EditFile($userinput), # could fail.
1577: $userinput);
1578: } else {
1579: &Failure($client,"refused\n",$userinput);
1580: }
1581: } else {
1582: &Failure($client,"refused\n",$userinput);
1583: }
1584: } else {
1585: &Failure($client,"refused\n",$userinput);
1586: }
1587: return 1;
1588: }
1589: ®ister_handler("edit", \&edit_table_handler, 1, 0, 1);
1590:
1591: #
1592: # Authenticate a user against the LonCAPA authentication
1593: # database. Note that there are several authentication
1594: # possibilities:
1595: # - unix - The user can be authenticated against the unix
1596: # password file.
1597: # - internal - The user can be authenticated against a purely
1598: # internal per user password file.
1599: # - kerberos - The user can be authenticated against either a kerb4 or kerb5
1600: # ticket granting authority.
1601: # - user - The person tailoring LonCAPA can supply a user authentication
1602: # mechanism that is per system.
1603: #
1604: # Parameters:
1605: # $cmd - The command that got us here.
1606: # $tail - Tail of the command (remaining parameters).
1607: # $client - File descriptor connected to client.
1608: # Returns
1609: # 0 - Requested to exit, caller should shut down.
1610: # 1 - Continue processing.
1611: # Implicit inputs:
1612: # The authentication systems describe above have their own forms of implicit
1613: # input into the authentication process that are described above.
1614: #
1615: sub authenticate_handler {
1616: my ($cmd, $tail, $client) = @_;
1617:
1618:
1619: # Regenerate the full input line
1620:
1621: my $userinput = $cmd.":".$tail;
1622:
1623: # udom - User's domain.
1624: # uname - Username.
1625: # upass - User's password.
1626:
1627: my ($udom,$uname,$upass)=split(/:/,$tail);
1628: &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
1629: chomp($upass);
1630: $upass=&unescape($upass);
1631:
1632: my $pwdcorrect = &validate_user($udom, $uname, $upass);
1633: if($pwdcorrect) {
1634: &Reply( $client, "authorized\n", $userinput);
1635: #
1636: # Bad credentials: Failed to authorize
1637: #
1638: } else {
1639: &Failure( $client, "non_authorized\n", $userinput);
1640: }
1641:
1642: return 1;
1643: }
1644: ®ister_handler("auth", \&authenticate_handler, 1, 1, 0);
1645:
1646: #
1647: # Change a user's password. Note that this function is complicated by
1648: # the fact that a user may be authenticated in more than one way:
1649: # At present, we are not able to change the password for all types of
1650: # authentication methods. Only for:
1651: # unix - unix password or shadow passoword style authentication.
1652: # local - Locally written authentication mechanism.
1653: # For now, kerb4 and kerb5 password changes are not supported and result
1654: # in an error.
1655: # FUTURE WORK:
1656: # Support kerberos passwd changes?
1657: # Parameters:
1658: # $cmd - The command that got us here.
1659: # $tail - Tail of the command (remaining parameters).
1660: # $client - File descriptor connected to client.
1661: # Returns
1662: # 0 - Requested to exit, caller should shut down.
1663: # 1 - Continue processing.
1664: # Implicit inputs:
1665: # The authentication systems describe above have their own forms of implicit
1666: # input into the authentication process that are described above.
1667: sub change_password_handler {
1668: my ($cmd, $tail, $client) = @_;
1669:
1670: my $userinput = $cmd.":".$tail; # Reconstruct client's string.
1671:
1672: #
1673: # udom - user's domain.
1674: # uname - Username.
1675: # upass - Current password.
1676: # npass - New password.
1677:
1678: my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
1679:
1680: $upass=&unescape($upass);
1681: $npass=&unescape($npass);
1682: &Debug("Trying to change password for $uname");
1683:
1684: # First require that the user can be authenticated with their
1685: # old password:
1686:
1687: my $validated = &validate_user($udom, $uname, $upass);
1688: if($validated) {
1689: my $realpasswd = &get_auth_type($udom, $uname); # Defined since authd.
1690:
1691: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
1692: if ($howpwd eq 'internal') {
1693: &Debug("internal auth");
1694: my $salt=time;
1695: $salt=substr($salt,6,2);
1696: my $ncpass=crypt($npass,$salt);
1697: if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
1698: &logthis("Result of password change for "
1699: ."$uname: pwchange_success");
1700: &Reply($client, "ok\n", $userinput);
1701: } else {
1702: &logthis("Unable to open $uname passwd "
1703: ."to change password");
1704: &Failure( $client, "non_authorized\n",$userinput);
1705: }
1706: } elsif ($howpwd eq 'unix') {
1707: my $result = &change_unix_password($uname, $npass);
1708: &logthis("Result of password change for $uname: ".
1709: $result);
1710: &Reply($client, "$result\n", $userinput);
1711: } else {
1712: # this just means that the current password mode is not
1713: # one we know how to change (e.g the kerberos auth modes or
1714: # locally written auth handler).
1715: #
1716: &Failure( $client, "auth_mode_error\n", $userinput);
1717: }
1718:
1719: } else {
1720: &Failure( $client, "non_authorized\n", $userinput);
1721: }
1722:
1723: return 1;
1724: }
1725: ®ister_handler("passwd", \&change_password_handler, 1, 1, 0);
1726:
1727: #
1728: # Create a new user. User in this case means a lon-capa user.
1729: # The user must either already exist in some authentication realm
1730: # like kerberos or the /etc/passwd. If not, a user completely local to
1731: # this loncapa system is created.
1732: #
1733: # Parameters:
1734: # $cmd - The command that got us here.
1735: # $tail - Tail of the command (remaining parameters).
1736: # $client - File descriptor connected to client.
1737: # Returns
1738: # 0 - Requested to exit, caller should shut down.
1739: # 1 - Continue processing.
1740: # Implicit inputs:
1741: # The authentication systems describe above have their own forms of implicit
1742: # input into the authentication process that are described above.
1743: sub add_user_handler {
1744:
1745: my ($cmd, $tail, $client) = @_;
1746:
1747:
1748: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1749: my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
1750:
1751: &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
1752:
1753:
1754: if($udom eq $currentdomainid) { # Reject new users for other domains...
1755:
1756: my $oldumask=umask(0077);
1757: chomp($npass);
1758: $npass=&unescape($npass);
1759: my $passfilename = &password_path($udom, $uname);
1760: &Debug("Password file created will be:".$passfilename);
1761: if (-e $passfilename) {
1762: &Failure( $client, "already_exists\n", $userinput);
1763: } else {
1764: my $fperror='';
1765: if (!&mkpath($passfilename)) {
1766: $fperror="error: ".($!+0)." mkdir failed while attempting "
1767: ."makeuser";
1768: }
1769: unless ($fperror) {
1770: my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
1771: &Reply($client, $result, $userinput); #BUGBUG - could be fail
1772: } else {
1773: &Failure($client, "$fperror\n", $userinput);
1774: }
1775: }
1776: umask($oldumask);
1777: } else {
1778: &Failure($client, "not_right_domain\n",
1779: $userinput); # Even if we are multihomed.
1780:
1781: }
1782: return 1;
1783:
1784: }
1785: ®ister_handler("makeuser", \&add_user_handler, 1, 1, 0);
1786:
1787: #
1788: # Change the authentication method of a user. Note that this may
1789: # also implicitly change the user's password if, for example, the user is
1790: # joining an existing authentication realm. Known authentication realms at
1791: # this time are:
1792: # internal - Purely internal password file (only loncapa knows this user)
1793: # local - Institutionally written authentication module.
1794: # unix - Unix user (/etc/passwd with or without /etc/shadow).
1795: # kerb4 - kerberos version 4
1796: # kerb5 - kerberos version 5
1797: #
1798: # Parameters:
1799: # $cmd - The command that got us here.
1800: # $tail - Tail of the command (remaining parameters).
1801: # $client - File descriptor connected to client.
1802: # Returns
1803: # 0 - Requested to exit, caller should shut down.
1804: # 1 - Continue processing.
1805: # Implicit inputs:
1806: # The authentication systems describe above have their own forms of implicit
1807: # input into the authentication process that are described above.
1808: # NOTE:
1809: # This is also used to change the authentication credential values (e.g. passwd).
1810: #
1811: #
1812: sub change_authentication_handler {
1813:
1814: my ($cmd, $tail, $client) = @_;
1815:
1816: my $userinput = "$cmd:$tail"; # Reconstruct user input.
1817:
1818: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1819: &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
1820: if ($udom ne $currentdomainid) {
1821: &Failure( $client, "not_right_domain\n", $client);
1822: } else {
1823:
1824: chomp($npass);
1825:
1826: $npass=&unescape($npass);
1827: my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
1828: my $passfilename = &password_path($udom, $uname);
1829: if ($passfilename) { # Not allowed to create a new user!!
1830: # If just changing the unix passwd. need to arrange to run
1831: # passwd since otherwise make_passwd_file will run
1832: # lcuseradd which fails if an account already exists
1833: # (to prevent an unscrupulous LONCAPA admin from stealing
1834: # an existing account by overwriting it as a LonCAPA account).
1835:
1836: if(($oldauth =~/^unix/) && ($umode eq "unix")) {
1837: my $result = &change_unix_password($uname, $npass);
1838: &logthis("Result of password change for $uname: ".$result);
1839: if ($result eq "ok") {
1840: &Reply($client, "$result\n")
1841: } else {
1842: &Failure($client, "$result\n");
1843: }
1844: } else {
1845: my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
1846: #
1847: # If the current auth mode is internal, and the old auth mode was
1848: # unix, or krb*, and the user is an author for this domain,
1849: # re-run manage_permissions for that role in order to be able
1850: # to take ownership of the construction space back to www:www
1851: #
1852:
1853:
1854: if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
1855: (($oldauth =~ /^internal/) && ($umode eq "unix")) ) {
1856: if(&is_author($udom, $uname)) {
1857: &Debug(" Need to manage author permissions...");
1858: &manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
1859: }
1860: }
1861: &Reply($client, $result, $userinput);
1862: }
1863:
1864:
1865: } else {
1866: &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
1867: }
1868: }
1869: return 1;
1870: }
1871: ®ister_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
1872:
1873: #
1874: # Determines if this is the home server for a user. The home server
1875: # for a user will have his/her lon-capa passwd file. Therefore all we need
1876: # to do is determine if this file exists.
1877: #
1878: # Parameters:
1879: # $cmd - The command that got us here.
1880: # $tail - Tail of the command (remaining parameters).
1881: # $client - File descriptor connected to client.
1882: # Returns
1883: # 0 - Requested to exit, caller should shut down.
1884: # 1 - Continue processing.
1885: # Implicit inputs:
1886: # The authentication systems describe above have their own forms of implicit
1887: # input into the authentication process that are described above.
1888: #
1889: sub is_home_handler {
1890: my ($cmd, $tail, $client) = @_;
1891:
1892: my $userinput = "$cmd:$tail";
1893:
1894: my ($udom,$uname)=split(/:/,$tail);
1895: chomp($uname);
1896: my $passfile = &password_filename($udom, $uname);
1897: if($passfile) {
1898: &Reply( $client, "found\n", $userinput);
1899: } else {
1900: &Failure($client, "not_found\n", $userinput);
1901: }
1902: return 1;
1903: }
1904: ®ister_handler("home", \&is_home_handler, 0,1,0);
1905:
1906: #
1907: # Process an update request for a resource?? I think what's going on here is
1908: # that a resource has been modified that we hold a subscription to.
1909: # If the resource is not local, then we must update, or at least invalidate our
1910: # cached copy of the resource.
1911: # FUTURE WORK:
1912: # I need to look at this logic carefully. My druthers would be to follow
1913: # typical caching logic, and simple invalidate the cache, drop any subscription
1914: # an let the next fetch start the ball rolling again... however that may
1915: # actually be more difficult than it looks given the complex web of
1916: # proxy servers.
1917: # Parameters:
1918: # $cmd - The command that got us here.
1919: # $tail - Tail of the command (remaining parameters).
1920: # $client - File descriptor connected to client.
1921: # Returns
1922: # 0 - Requested to exit, caller should shut down.
1923: # 1 - Continue processing.
1924: # Implicit inputs:
1925: # The authentication systems describe above have their own forms of implicit
1926: # input into the authentication process that are described above.
1927: #
1928: sub update_resource_handler {
1929:
1930: my ($cmd, $tail, $client) = @_;
1931:
1932: my $userinput = "$cmd:$tail";
1933:
1934: my $fname= $tail; # This allows interactive testing
1935:
1936:
1937: my $ownership=ishome($fname);
1938: if ($ownership eq 'not_owner') {
1939: if (-e $fname) {
1940: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
1941: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
1942: my $now=time;
1943: my $since=$now-$atime;
1944: if ($since>$perlvar{'lonExpire'}) {
1945: my $reply=&reply("unsub:$fname","$clientname");
1946: unlink("$fname");
1947: } else {
1948: my $transname="$fname.in.transfer";
1949: my $remoteurl=&reply("sub:$fname","$clientname");
1950: my $response;
1951: alarm(120);
1952: {
1953: my $ua=new LWP::UserAgent;
1954: my $request=new HTTP::Request('GET',"$remoteurl");
1955: $response=$ua->request($request,$transname);
1956: }
1957: alarm(0);
1958: if ($response->is_error()) {
1959: unlink($transname);
1960: my $message=$response->status_line;
1961: &logthis("LWP GET: $message for $fname ($remoteurl)");
1962: } else {
1963: if ($remoteurl!~/\.meta$/) {
1964: alarm(120);
1965: {
1966: my $ua=new LWP::UserAgent;
1967: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
1968: my $mresponse=$ua->request($mrequest,$fname.'.meta');
1969: if ($mresponse->is_error()) {
1970: unlink($fname.'.meta');
1971: }
1972: }
1973: alarm(0);
1974: }
1975: rename($transname,$fname);
1976: use Cache::Memcached;
1977: my $memcache=
1978: new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
1979: my $url=$fname;
1980: $url=~s-^/home/httpd/html--;
1981: my $id=&escape('meta:'.$url);
1982: $memcache->delete($id);
1983: }
1984: }
1985: &Reply( $client, "ok\n", $userinput);
1986: } else {
1987: &Failure($client, "not_found\n", $userinput);
1988: }
1989: } else {
1990: &Failure($client, "rejected\n", $userinput);
1991: }
1992: return 1;
1993: }
1994: ®ister_handler("update", \&update_resource_handler, 0 ,1, 0);
1995:
1996: #
1997: # Fetch a user file from a remote server to the user's home directory
1998: # userfiles subdir.
1999: # Parameters:
2000: # $cmd - The command that got us here.
2001: # $tail - Tail of the command (remaining parameters).
2002: # $client - File descriptor connected to client.
2003: # Returns
2004: # 0 - Requested to exit, caller should shut down.
2005: # 1 - Continue processing.
2006: #
2007: sub fetch_user_file_handler {
2008:
2009: my ($cmd, $tail, $client) = @_;
2010:
2011: my $userinput = "$cmd:$tail";
2012: my $fname = $tail;
2013: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
2014: my $udir=&propath($udom,$uname).'/userfiles';
2015: unless (-e $udir) {
2016: mkdir($udir,0770);
2017: }
2018: Debug("fetch user file for $fname");
2019: if (-e $udir) {
2020: $ufile=~s/^[\.\~]+//;
2021:
2022: # IF necessary, create the path right down to the file.
2023: # Note that any regular files in the way of this path are
2024: # wiped out to deal with some earlier folly of mine.
2025:
2026: if (!&mkpath($udir.'/'.$ufile)) {
2027: &Failure($client, "unable_to_create\n", $userinput);
2028: }
2029:
2030: my $destname=$udir.'/'.$ufile;
2031: my $transname=$udir.'/'.$ufile.'.in.transit';
2032: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
2033: my $response;
2034: Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
2035: alarm(120);
2036: {
2037: my $ua=new LWP::UserAgent;
2038: my $request=new HTTP::Request('GET',"$remoteurl");
2039: $response=$ua->request($request,$transname);
2040: }
2041: alarm(0);
2042: if ($response->is_error()) {
2043: unlink($transname);
2044: my $message=$response->status_line;
2045: &logthis("LWP GET: $message for $fname ($remoteurl)");
2046: &Failure($client, "failed\n", $userinput);
2047: } else {
2048: Debug("Renaming $transname to $destname");
2049: if (!rename($transname,$destname)) {
2050: &logthis("Unable to move $transname to $destname");
2051: unlink($transname);
2052: &Failure($client, "failed\n", $userinput);
2053: } else {
2054: &Reply($client, "ok\n", $userinput);
2055: }
2056: }
2057: } else {
2058: &Failure($client, "not_home\n", $userinput);
2059: }
2060: return 1;
2061: }
2062: ®ister_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
2063:
2064: #
2065: # Remove a file from a user's home directory userfiles subdirectory.
2066: # Parameters:
2067: # cmd - the Lond request keyword that got us here.
2068: # tail - the part of the command past the keyword.
2069: # client- File descriptor connected with the client.
2070: #
2071: # Returns:
2072: # 1 - Continue processing.
2073: sub remove_user_file_handler {
2074: my ($cmd, $tail, $client) = @_;
2075:
2076: my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2077:
2078: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
2079: if ($ufile =~m|/\.\./|) {
2080: # any files paths with /../ in them refuse
2081: # to deal with
2082: &Failure($client, "refused\n", "$cmd:$tail");
2083: } else {
2084: my $udir = &propath($udom,$uname);
2085: if (-e $udir) {
2086: my $file=$udir.'/userfiles/'.$ufile;
2087: if (-e $file) {
2088: #
2089: # If the file is a regular file unlink is fine...
2090: # However it's possible the client wants a dir.
2091: # removed, in which case rmdir is more approprate:
2092: #
2093: if (-f $file){
2094: unlink($file);
2095: } elsif(-d $file) {
2096: rmdir($file);
2097: }
2098: if (-e $file) {
2099: # File is still there after we deleted it ?!?
2100:
2101: &Failure($client, "failed\n", "$cmd:$tail");
2102: } else {
2103: &Reply($client, "ok\n", "$cmd:$tail");
2104: }
2105: } else {
2106: &Failure($client, "not_found\n", "$cmd:$tail");
2107: }
2108: } else {
2109: &Failure($client, "not_home\n", "$cmd:$tail");
2110: }
2111: }
2112: return 1;
2113: }
2114: ®ister_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
2115:
2116: #
2117: # make a directory in a user's home directory userfiles subdirectory.
2118: # Parameters:
2119: # cmd - the Lond request keyword that got us here.
2120: # tail - the part of the command past the keyword.
2121: # client- File descriptor connected with the client.
2122: #
2123: # Returns:
2124: # 1 - Continue processing.
2125: sub mkdir_user_file_handler {
2126: my ($cmd, $tail, $client) = @_;
2127:
2128: my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2129: $dir=&unescape($dir);
2130: my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
2131: if ($ufile =~m|/\.\./|) {
2132: # any files paths with /../ in them refuse
2133: # to deal with
2134: &Failure($client, "refused\n", "$cmd:$tail");
2135: } else {
2136: my $udir = &propath($udom,$uname);
2137: if (-e $udir) {
2138: my $newdir=$udir.'/userfiles/'.$ufile.'/';
2139: if (!&mkpath($newdir)) {
2140: &Failure($client, "failed\n", "$cmd:$tail");
2141: }
2142: &Reply($client, "ok\n", "$cmd:$tail");
2143: } else {
2144: &Failure($client, "not_home\n", "$cmd:$tail");
2145: }
2146: }
2147: return 1;
2148: }
2149: ®ister_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
2150:
2151: #
2152: # rename a file in a user's home directory userfiles subdirectory.
2153: # Parameters:
2154: # cmd - the Lond request keyword that got us here.
2155: # tail - the part of the command past the keyword.
2156: # client- File descriptor connected with the client.
2157: #
2158: # Returns:
2159: # 1 - Continue processing.
2160: sub rename_user_file_handler {
2161: my ($cmd, $tail, $client) = @_;
2162:
2163: my ($udom,$uname,$old,$new) = split(/:/, $tail);
2164: $old=&unescape($old);
2165: $new=&unescape($new);
2166: if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
2167: # any files paths with /../ in them refuse to deal with
2168: &Failure($client, "refused\n", "$cmd:$tail");
2169: } else {
2170: my $udir = &propath($udom,$uname);
2171: if (-e $udir) {
2172: my $oldfile=$udir.'/userfiles/'.$old;
2173: my $newfile=$udir.'/userfiles/'.$new;
2174: if (-e $newfile) {
2175: &Failure($client, "exists\n", "$cmd:$tail");
2176: } elsif (! -e $oldfile) {
2177: &Failure($client, "not_found\n", "$cmd:$tail");
2178: } else {
2179: if (!rename($oldfile,$newfile)) {
2180: &Failure($client, "failed\n", "$cmd:$tail");
2181: } else {
2182: &Reply($client, "ok\n", "$cmd:$tail");
2183: }
2184: }
2185: } else {
2186: &Failure($client, "not_home\n", "$cmd:$tail");
2187: }
2188: }
2189: return 1;
2190: }
2191: ®ister_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
2192:
2193: #
2194: # Authenticate access to a user file by checking that the token the user's
2195: # passed also exists in their session file
2196: #
2197: # Parameters:
2198: # cmd - The request keyword that dispatched to tus.
2199: # tail - The tail of the request (colon separated parameters).
2200: # client - Filehandle open on the client.
2201: # Return:
2202: # 1.
2203: sub token_auth_user_file_handler {
2204: my ($cmd, $tail, $client) = @_;
2205:
2206: my ($fname, $session) = split(/:/, $tail);
2207:
2208: chomp($session);
2209: my $reply="non_auth\n";
2210: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
2211: $session.'.id')) {
2212: while (my $line=<ENVIN>) {
2213: if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply="ok\n"; }
2214: }
2215: close(ENVIN);
2216: &Reply($client, $reply, "$cmd:$tail");
2217: } else {
2218: &Failure($client, "invalid_token\n", "$cmd:$tail");
2219: }
2220: return 1;
2221:
2222: }
2223: ®ister_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
2224:
2225: #
2226: # Unsubscribe from a resource.
2227: #
2228: # Parameters:
2229: # $cmd - The command that got us here.
2230: # $tail - Tail of the command (remaining parameters).
2231: # $client - File descriptor connected to client.
2232: # Returns
2233: # 0 - Requested to exit, caller should shut down.
2234: # 1 - Continue processing.
2235: #
2236: sub unsubscribe_handler {
2237: my ($cmd, $tail, $client) = @_;
2238:
2239: my $userinput= "$cmd:$tail";
2240:
2241: my ($fname) = split(/:/,$tail); # Split in case there's extrs.
2242:
2243: &Debug("Unsubscribing $fname");
2244: if (-e $fname) {
2245: &Debug("Exists");
2246: &Reply($client, &unsub($fname,$clientip), $userinput);
2247: } else {
2248: &Failure($client, "not_found\n", $userinput);
2249: }
2250: return 1;
2251: }
2252: ®ister_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
2253:
2254: # Subscribe to a resource
2255: #
2256: # Parameters:
2257: # $cmd - The command that got us here.
2258: # $tail - Tail of the command (remaining parameters).
2259: # $client - File descriptor connected to client.
2260: # Returns
2261: # 0 - Requested to exit, caller should shut down.
2262: # 1 - Continue processing.
2263: #
2264: sub subscribe_handler {
2265: my ($cmd, $tail, $client)= @_;
2266:
2267: my $userinput = "$cmd:$tail";
2268:
2269: &Reply( $client, &subscribe($userinput,$clientip), $userinput);
2270:
2271: return 1;
2272: }
2273: ®ister_handler("sub", \&subscribe_handler, 0, 1, 0);
2274:
2275: #
2276: # Determine the version of a resource (?) Or is it return
2277: # the top version of the resource? Not yet clear from the
2278: # code in currentversion.
2279: #
2280: # Parameters:
2281: # $cmd - The command that got us here.
2282: # $tail - Tail of the command (remaining parameters).
2283: # $client - File descriptor connected to client.
2284: # Returns
2285: # 0 - Requested to exit, caller should shut down.
2286: # 1 - Continue processing.
2287: #
2288: sub current_version_handler {
2289: my ($cmd, $tail, $client) = @_;
2290:
2291: my $userinput= "$cmd:$tail";
2292:
2293: my $fname = $tail;
2294: &Reply( $client, ¤tversion($fname)."\n", $userinput);
2295: return 1;
2296:
2297: }
2298: ®ister_handler("currentversion", \¤t_version_handler, 0, 1, 0);
2299:
2300: # Make an entry in a user's activity log.
2301: #
2302: # Parameters:
2303: # $cmd - The command that got us here.
2304: # $tail - Tail of the command (remaining parameters).
2305: # $client - File descriptor connected to client.
2306: # Returns
2307: # 0 - Requested to exit, caller should shut down.
2308: # 1 - Continue processing.
2309: #
2310: sub activity_log_handler {
2311: my ($cmd, $tail, $client) = @_;
2312:
2313:
2314: my $userinput= "$cmd:$tail";
2315:
2316: my ($udom,$uname,$what)=split(/:/,$tail);
2317: chomp($what);
2318: my $proname=&propath($udom,$uname);
2319: my $now=time;
2320: my $hfh;
2321: if ($hfh=IO::File->new(">>$proname/activity.log")) {
2322: print $hfh "$now:$clientname:$what\n";
2323: &Reply( $client, "ok\n", $userinput);
2324: } else {
2325: &Failure($client, "error: ".($!+0)." IO::File->new Failed "
2326: ."while attempting log\n",
2327: $userinput);
2328: }
2329:
2330: return 1;
2331: }
2332: ®ister_handler("log", \&activity_log_handler, 0, 1, 0);
2333:
2334: #
2335: # Put a namespace entry in a user profile hash.
2336: # My druthers would be for this to be an encrypted interaction too.
2337: # anything that might be an inadvertent covert channel about either
2338: # user authentication or user personal information....
2339: #
2340: # Parameters:
2341: # $cmd - The command that got us here.
2342: # $tail - Tail of the command (remaining parameters).
2343: # $client - File descriptor connected to client.
2344: # Returns
2345: # 0 - Requested to exit, caller should shut down.
2346: # 1 - Continue processing.
2347: #
2348: sub put_user_profile_entry {
2349: my ($cmd, $tail, $client) = @_;
2350:
2351: my $userinput = "$cmd:$tail";
2352:
2353: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
2354: if ($namespace ne 'roles') {
2355: chomp($what);
2356: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2357: &GDBM_WRCREAT(),"P",$what);
2358: if($hashref) {
2359: my @pairs=split(/\&/,$what);
2360: foreach my $pair (@pairs) {
2361: my ($key,$value)=split(/=/,$pair);
2362: $hashref->{$key}=$value;
2363: }
2364: if (untie(%$hashref)) {
2365: &Reply( $client, "ok\n", $userinput);
2366: } else {
2367: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2368: "while attempting put\n",
2369: $userinput);
2370: }
2371: } else {
2372: &Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
2373: "while attempting put\n", $userinput);
2374: }
2375: } else {
2376: &Failure( $client, "refused\n", $userinput);
2377: }
2378:
2379: return 1;
2380: }
2381: ®ister_handler("put", \&put_user_profile_entry, 0, 1, 0);
2382:
2383: # Put a piece of new data in hash, returns error if entry already exists
2384: # Parameters:
2385: # $cmd - The command that got us here.
2386: # $tail - Tail of the command (remaining parameters).
2387: # $client - File descriptor connected to client.
2388: # Returns
2389: # 0 - Requested to exit, caller should shut down.
2390: # 1 - Continue processing.
2391: #
2392: sub newput_user_profile_entry {
2393: my ($cmd, $tail, $client) = @_;
2394:
2395: my $userinput = "$cmd:$tail";
2396:
2397: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
2398: if ($namespace eq 'roles') {
2399: &Failure( $client, "refused\n", $userinput);
2400: return 1;
2401: }
2402:
2403: chomp($what);
2404:
2405: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2406: &GDBM_WRCREAT(),"N",$what);
2407: if(!$hashref) {
2408: &Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
2409: "while attempting put\n", $userinput);
2410: return 1;
2411: }
2412:
2413: my @pairs=split(/\&/,$what);
2414: foreach my $pair (@pairs) {
2415: my ($key,$value)=split(/=/,$pair);
2416: if (exists($hashref->{$key})) {
2417: &Failure($client, "key_exists: ".$key."\n",$userinput);
2418: return 1;
2419: }
2420: }
2421:
2422: foreach my $pair (@pairs) {
2423: my ($key,$value)=split(/=/,$pair);
2424: $hashref->{$key}=$value;
2425: }
2426:
2427: if (untie(%$hashref)) {
2428: &Reply( $client, "ok\n", $userinput);
2429: } else {
2430: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2431: "while attempting put\n",
2432: $userinput);
2433: }
2434: return 1;
2435: }
2436: ®ister_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
2437:
2438: #
2439: # Increment a profile entry in the user history file.
2440: # The history contains keyword value pairs. In this case,
2441: # The value itself is a pair of numbers. The first, the current value
2442: # the second an increment that this function applies to the current
2443: # value.
2444: #
2445: # Parameters:
2446: # $cmd - The command that got us here.
2447: # $tail - Tail of the command (remaining parameters).
2448: # $client - File descriptor connected to client.
2449: # Returns
2450: # 0 - Requested to exit, caller should shut down.
2451: # 1 - Continue processing.
2452: #
2453: sub increment_user_value_handler {
2454: my ($cmd, $tail, $client) = @_;
2455:
2456: my $userinput = "$cmd:$tail";
2457:
2458: my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
2459: if ($namespace ne 'roles') {
2460: chomp($what);
2461: my $hashref = &tie_user_hash($udom, $uname,
2462: $namespace, &GDBM_WRCREAT(),
2463: "P",$what);
2464: if ($hashref) {
2465: my @pairs=split(/\&/,$what);
2466: foreach my $pair (@pairs) {
2467: my ($key,$value)=split(/=/,$pair);
2468: $value = &unescape($value);
2469: # We could check that we have a number...
2470: if (! defined($value) || $value eq '') {
2471: $value = 1;
2472: }
2473: $hashref->{$key}+=$value;
2474: if ($namespace eq 'nohist_resourcetracker') {
2475: if ($hashref->{$key} < 0) {
2476: $hashref->{$key} = 0;
2477: }
2478: }
2479: }
2480: if (untie(%$hashref)) {
2481: &Reply( $client, "ok\n", $userinput);
2482: } else {
2483: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2484: "while attempting inc\n", $userinput);
2485: }
2486: } else {
2487: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2488: "while attempting inc\n", $userinput);
2489: }
2490: } else {
2491: &Failure($client, "refused\n", $userinput);
2492: }
2493:
2494: return 1;
2495: }
2496: ®ister_handler("inc", \&increment_user_value_handler, 0, 1, 0);
2497:
2498: #
2499: # Put a new role for a user. Roles are LonCAPA's packaging of permissions.
2500: # Each 'role' a user has implies a set of permissions. Adding a new role
2501: # for a person grants the permissions packaged with that role
2502: # to that user when the role is selected.
2503: #
2504: # Parameters:
2505: # $cmd - The command string (rolesput).
2506: # $tail - The remainder of the request line. For rolesput this
2507: # consists of a colon separated list that contains:
2508: # The domain and user that is granting the role (logged).
2509: # The domain and user that is getting the role.
2510: # The roles being granted as a set of & separated pairs.
2511: # each pair a key value pair.
2512: # $client - File descriptor connected to the client.
2513: # Returns:
2514: # 0 - If the daemon should exit
2515: # 1 - To continue processing.
2516: #
2517: #
2518: sub roles_put_handler {
2519: my ($cmd, $tail, $client) = @_;
2520:
2521: my $userinput = "$cmd:$tail";
2522:
2523: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail);
2524:
2525:
2526: my $namespace='roles';
2527: chomp($what);
2528: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2529: &GDBM_WRCREAT(), "P",
2530: "$exedom:$exeuser:$what");
2531: #
2532: # Log the attempt to set a role. The {}'s here ensure that the file
2533: # handle is open for the minimal amount of time. Since the flush
2534: # is done on close this improves the chances the log will be an un-
2535: # corrupted ordered thing.
2536: if ($hashref) {
2537: my $pass_entry = &get_auth_type($udom, $uname);
2538: my ($auth_type,$pwd) = split(/:/, $pass_entry);
2539: $auth_type = $auth_type.":";
2540: my @pairs=split(/\&/,$what);
2541: foreach my $pair (@pairs) {
2542: my ($key,$value)=split(/=/,$pair);
2543: &manage_permissions($key, $udom, $uname,
2544: $auth_type);
2545: $hashref->{$key}=$value;
2546: }
2547: if (untie($hashref)) {
2548: &Reply($client, "ok\n", $userinput);
2549: } else {
2550: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2551: "while attempting rolesput\n", $userinput);
2552: }
2553: } else {
2554: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2555: "while attempting rolesput\n", $userinput);
2556: }
2557: return 1;
2558: }
2559: ®ister_handler("rolesput", \&roles_put_handler, 1,1,0); # Encoded client only.
2560:
2561: #
2562: # Deletes (removes) a role for a user. This is equivalent to removing
2563: # a permissions package associated with the role from the user's profile.
2564: #
2565: # Parameters:
2566: # $cmd - The command (rolesdel)
2567: # $tail - The remainder of the request line. This consists
2568: # of:
2569: # The domain and user requesting the change (logged)
2570: # The domain and user being changed.
2571: # The roles being revoked. These are shipped to us
2572: # as a bunch of & separated role name keywords.
2573: # $client - The file handle open on the client.
2574: # Returns:
2575: # 1 - Continue processing
2576: # 0 - Exit.
2577: #
2578: sub roles_delete_handler {
2579: my ($cmd, $tail, $client) = @_;
2580:
2581: my $userinput = "$cmd:$tail";
2582:
2583: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
2584: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
2585: "what = ".$what);
2586: my $namespace='roles';
2587: chomp($what);
2588: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2589: &GDBM_WRCREAT(), "D",
2590: "$exedom:$exeuser:$what");
2591:
2592: if ($hashref) {
2593: my @rolekeys=split(/\&/,$what);
2594:
2595: foreach my $key (@rolekeys) {
2596: delete $hashref->{$key};
2597: }
2598: if (untie(%$hashref)) {
2599: &Reply($client, "ok\n", $userinput);
2600: } else {
2601: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2602: "while attempting rolesdel\n", $userinput);
2603: }
2604: } else {
2605: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2606: "while attempting rolesdel\n", $userinput);
2607: }
2608:
2609: return 1;
2610: }
2611: ®ister_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
2612:
2613: # Unencrypted get from a user's profile database. See
2614: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
2615: # This function retrieves a keyed item from a specific named database in the
2616: # user's directory.
2617: #
2618: # Parameters:
2619: # $cmd - Command request keyword (get).
2620: # $tail - Tail of the command. This is a colon separated list
2621: # consisting of the domain and username that uniquely
2622: # identifies the profile,
2623: # The 'namespace' which selects the gdbm file to
2624: # do the lookup in,
2625: # & separated list of keys to lookup. Note that
2626: # the values are returned as an & separated list too.
2627: # $client - File descriptor open on the client.
2628: # Returns:
2629: # 1 - Continue processing.
2630: # 0 - Exit.
2631: #
2632: sub get_profile_entry {
2633: my ($cmd, $tail, $client) = @_;
2634:
2635: my $userinput= "$cmd:$tail";
2636:
2637: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2638: chomp($what);
2639:
2640: my $replystring = read_profile($udom, $uname, $namespace, $what);
2641: my ($first) = split(/:/,$replystring);
2642: if($first ne "error") {
2643: &Reply($client, "$replystring\n", $userinput);
2644: } else {
2645: &Failure($client, $replystring." while attempting get\n", $userinput);
2646: }
2647: return 1;
2648:
2649:
2650: }
2651: ®ister_handler("get", \&get_profile_entry, 0,1,0);
2652:
2653: #
2654: # Process the encrypted get request. Note that the request is sent
2655: # in clear, but the reply is encrypted. This is a small covert channel:
2656: # information about the sensitive keys is given to the snooper. Just not
2657: # information about the values of the sensitive key. Hmm if I wanted to
2658: # know these I'd snoop for the egets. Get the profile item names from them
2659: # and then issue a get for them since there's no enforcement of the
2660: # requirement of an encrypted get for particular profile items. If I
2661: # were re-doing this, I'd force the request to be encrypted as well as the
2662: # reply. I'd also just enforce encrypted transactions for all gets since
2663: # that would prevent any covert channel snooping.
2664: #
2665: # Parameters:
2666: # $cmd - Command keyword of request (eget).
2667: # $tail - Tail of the command. See GetProfileEntry
# for more information about this.
2668: # $client - File open on the client.
2669: # Returns:
2670: # 1 - Continue processing
2671: # 0 - server should exit.
2672: sub get_profile_entry_encrypted {
2673: my ($cmd, $tail, $client) = @_;
2674:
2675: my $userinput = "$cmd:$tail";
2676:
2677: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
2678: chomp($what);
2679: my $qresult = read_profile($udom, $uname, $namespace, $what);
2680: my ($first) = split(/:/, $qresult);
2681: if($first ne "error") {
2682:
2683: if ($cipher) {
2684: my $cmdlength=length($qresult);
2685: $qresult.=" ";
2686: my $encqresult='';
2687: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
2688: $encqresult.= unpack("H16",
2689: $cipher->encrypt(substr($qresult,
2690: $encidx,
2691: 8)));
2692: }
2693: &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
2694: } else {
2695: &Failure( $client, "error:no_key\n", $userinput);
2696: }
2697: } else {
2698: &Failure($client, "$qresult while attempting eget\n", $userinput);
2699:
2700: }
2701:
2702: return 1;
2703: }
2704: ®ister_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
2705:
2706: #
2707: # Deletes a key in a user profile database.
2708: #
2709: # Parameters:
2710: # $cmd - Command keyword (del).
2711: # $tail - Command tail. IN this case a colon
2712: # separated list containing:
2713: # The domain and user that identifies uniquely
2714: # the identity of the user.
2715: # The profile namespace (name of the profile
2716: # database file).
2717: # & separated list of keywords to delete.
2718: # $client - File open on client socket.
2719: # Returns:
2720: # 1 - Continue processing
2721: # 0 - Exit server.
2722: #
2723: #
2724: sub delete_profile_entry {
2725: my ($cmd, $tail, $client) = @_;
2726:
2727: my $userinput = "cmd:$tail";
2728:
2729: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2730: chomp($what);
2731: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2732: &GDBM_WRCREAT(),
2733: "D",$what);
2734: if ($hashref) {
2735: my @keys=split(/\&/,$what);
2736: foreach my $key (@keys) {
2737: delete($hashref->{$key});
2738: }
2739: if (untie(%$hashref)) {
2740: &Reply($client, "ok\n", $userinput);
2741: } else {
2742: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2743: "while attempting del\n", $userinput);
2744: }
2745: } else {
2746: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2747: "while attempting del\n", $userinput);
2748: }
2749: return 1;
2750: }
2751: ®ister_handler("del", \&delete_profile_entry, 0, 1, 0);
2752:
2753: #
2754: # List the set of keys that are defined in a profile database file.
2755: # A successful reply from this will contain an & separated list of
2756: # the keys.
2757: # Parameters:
2758: # $cmd - Command request (keys).
2759: # $tail - Remainder of the request, a colon separated
2760: # list containing domain/user that identifies the
2761: # user being queried, and the database namespace
2762: # (database filename essentially).
2763: # $client - File open on the client.
2764: # Returns:
2765: # 1 - Continue processing.
2766: # 0 - Exit the server.
2767: #
2768: sub get_profile_keys {
2769: my ($cmd, $tail, $client) = @_;
2770:
2771: my $userinput = "$cmd:$tail";
2772:
2773: my ($udom,$uname,$namespace)=split(/:/,$tail);
2774: my $qresult='';
2775: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2776: &GDBM_READER());
2777: if ($hashref) {
2778: foreach my $key (keys %$hashref) {
2779: $qresult.="$key&";
2780: }
2781: if (untie(%$hashref)) {
2782: $qresult=~s/\&$//;
2783: &Reply($client, "$qresult\n", $userinput);
2784: } else {
2785: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2786: "while attempting keys\n", $userinput);
2787: }
2788: } else {
2789: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2790: "while attempting keys\n", $userinput);
2791: }
2792:
2793: return 1;
2794: }
2795: ®ister_handler("keys", \&get_profile_keys, 0, 1, 0);
2796:
2797: #
2798: # Dump the contents of a user profile database.
2799: # Note that this constitutes a very large covert channel too since
2800: # the dump will return sensitive information that is not encrypted.
2801: # The naive security assumption is that the session negotiation ensures
2802: # our client is trusted and I don't believe that's assured at present.
2803: # Sure want badly to go to ssl or tls. Of course if my peer isn't really
2804: # a LonCAPA node they could have negotiated an encryption key too so >sigh<.
2805: #
2806: # Parameters:
2807: # $cmd - The command request keyword (currentdump).
2808: # $tail - Remainder of the request, consisting of a colon
2809: # separated list that has the domain/username and
2810: # the namespace to dump (database file).
2811: # $client - file open on the remote client.
2812: # Returns:
2813: # 1 - Continue processing.
2814: # 0 - Exit the server.
2815: #
2816: sub dump_profile_database {
2817: my ($cmd, $tail, $client) = @_;
2818:
2819: my $userinput = "$cmd:$tail";
2820:
2821: my ($udom,$uname,$namespace) = split(/:/,$tail);
2822: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2823: &GDBM_READER());
2824: if ($hashref) {
2825: # Structure of %data:
2826: # $data{$symb}->{$parameter}=$value;
2827: # $data{$symb}->{'v.'.$parameter}=$version;
2828: # since $parameter will be unescaped, we do not
2829: # have to worry about silly parameter names...
2830:
2831: my $qresult='';
2832: my %data = (); # A hash of anonymous hashes..
2833: while (my ($key,$value) = each(%$hashref)) {
2834: my ($v,$symb,$param) = split(/:/,$key);
2835: next if ($v eq 'version' || $symb eq 'keys');
2836: next if (exists($data{$symb}) &&
2837: exists($data{$symb}->{$param}) &&
2838: $data{$symb}->{'v.'.$param} > $v);
2839: $data{$symb}->{$param}=$value;
2840: $data{$symb}->{'v.'.$param}=$v;
2841: }
2842: if (untie(%$hashref)) {
2843: while (my ($symb,$param_hash) = each(%data)) {
2844: while(my ($param,$value) = each (%$param_hash)){
2845: next if ($param =~ /^v\./); # Ignore versions...
2846: #
2847: # Just dump the symb=value pairs separated by &
2848: #
2849: $qresult.=$symb.':'.$param.'='.$value.'&';
2850: }
2851: }
2852: chop($qresult);
2853: &Reply($client , "$qresult\n", $userinput);
2854: } else {
2855: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2856: "while attempting currentdump\n", $userinput);
2857: }
2858: } else {
2859: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2860: "while attempting currentdump\n", $userinput);
2861: }
2862:
2863: return 1;
2864: }
2865: ®ister_handler("currentdump", \&dump_profile_database, 0, 1, 0);
2866:
2867: #
2868: # Dump a profile database with an optional regular expression
2869: # to match against the keys. In this dump, no effort is made
2870: # to separate symb from version information. Presumably the
2871: # databases that are dumped by this command are of a different
2872: # structure. Need to look at this and improve the documentation of
2873: # both this and the currentdump handler.
2874: # Parameters:
2875: # $cmd - The command keyword.
2876: # $tail - All of the characters after the $cmd:
2877: # These are expected to be a colon
2878: # separated list containing:
2879: # domain/user - identifying the user.
2880: # namespace - identifying the database.
2881: # regexp - optional regular expression
2882: # that is matched against
2883: # database keywords to do
2884: # selective dumps.
2885: # $client - Channel open on the client.
2886: # Returns:
2887: # 1 - Continue processing.
2888: # Side effects:
2889: # response is written to $client.
2890: #
2891: sub dump_with_regexp {
2892: my ($cmd, $tail, $client) = @_;
2893:
2894:
2895: my $userinput = "$cmd:$tail";
2896:
2897: my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
2898: if (defined($regexp)) {
2899: $regexp=&unescape($regexp);
2900: } else {
2901: $regexp='.';
2902: }
2903: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2904: &GDBM_READER());
2905: if ($hashref) {
2906: my $qresult='';
2907: while (my ($key,$value) = each(%$hashref)) {
2908: if ($regexp eq '.') {
2909: $qresult.=$key.'='.$value.'&';
2910: } else {
2911: my $unescapeKey = &unescape($key);
2912: if (eval('$unescapeKey=~/$regexp/')) {
2913: $qresult.="$key=$value&";
2914: }
2915: }
2916: }
2917: if (untie(%$hashref)) {
2918: chop($qresult);
2919: &Reply($client, "$qresult\n", $userinput);
2920: } else {
2921: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2922: "while attempting dump\n", $userinput);
2923: }
2924: } else {
2925: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2926: "while attempting dump\n", $userinput);
2927: }
2928:
2929: return 1;
2930: }
2931: ®ister_handler("dump", \&dump_with_regexp, 0, 1, 0);
2932:
2933: # Store a set of key=value pairs associated with a versioned name.
2934: #
2935: # Parameters:
2936: # $cmd - Request command keyword.
2937: # $tail - Tail of the request. This is a colon
2938: # separated list containing:
2939: # domain/user - User and authentication domain.
2940: # namespace - Name of the database being modified
2941: # rid - Resource keyword to modify.
2942: # what - new value associated with rid.
2943: #
2944: # $client - Socket open on the client.
2945: #
2946: #
2947: # Returns:
2948: # 1 (keep on processing).
2949: # Side-Effects:
2950: # Writes to the client
2951: sub store_handler {
2952: my ($cmd, $tail, $client) = @_;
2953:
2954: my $userinput = "$cmd:$tail";
2955:
2956: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
2957: if ($namespace ne 'roles') {
2958:
2959: chomp($what);
2960: my @pairs=split(/\&/,$what);
2961: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2962: &GDBM_WRCREAT(), "S",
2963: "$rid:$what");
2964: if ($hashref) {
2965: my $now = time;
2966: my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
2967: my $key;
2968: $hashref->{"version:$rid"}++;
2969: my $version=$hashref->{"version:$rid"};
2970: my $allkeys='';
2971: foreach my $pair (@pairs) {
2972: my ($key,$value)=split(/=/,$pair);
2973: $allkeys.=$key.':';
2974: $hashref->{"$version:$rid:$key"}=$value;
2975: }
2976: $hashref->{"$version:$rid:timestamp"}=$now;
2977: $allkeys.='timestamp';
2978: $hashref->{"$version:keys:$rid"}=$allkeys;
2979: if (untie($hashref)) {
2980: &Reply($client, "ok\n", $userinput);
2981: } else {
2982: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2983: "while attempting store\n", $userinput);
2984: }
2985: } else {
2986: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2987: "while attempting store\n", $userinput);
2988: }
2989: } else {
2990: &Failure($client, "refused\n", $userinput);
2991: }
2992:
2993: return 1;
2994: }
2995: ®ister_handler("store", \&store_handler, 0, 1, 0);
2996:
2997: #
2998: # Dump out all versions of a resource that has key=value pairs associated
2999: # with it for each version. These resources are built up via the store
3000: # command.
3001: #
3002: # Parameters:
3003: # $cmd - Command keyword.
3004: # $tail - Remainder of the request which consists of:
3005: # domain/user - User and auth. domain.
3006: # namespace - name of resource database.
3007: # rid - Resource id.
3008: # $client - socket open on the client.
3009: #
3010: # Returns:
3011: # 1 indicating the caller should not yet exit.
3012: # Side-effects:
3013: # Writes a reply to the client.
3014: # The reply is a string of the following shape:
3015: # version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
3016: # Where the 1 above represents version 1.
3017: # this continues for all pairs of keys in all versions.
3018: #
3019: #
3020: #
3021: #
3022: sub restore_handler {
3023: my ($cmd, $tail, $client) = @_;
3024:
3025: my $userinput = "$cmd:$tail"; # Only used for logging purposes.
3026:
3027: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
3028: $namespace=~s/\//\_/g;
3029: $namespace=~s/\W//g;
3030: chomp($rid);
3031: my $proname=&propath($udom,$uname);
3032: my $qresult='';
3033: my %hash;
3034: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
3035: &GDBM_READER(),0640)) {
3036: my $version=$hash{"version:$rid"};
3037: $qresult.="version=$version&";
3038: my $scope;
3039: for ($scope=1;$scope<=$version;$scope++) {
3040: my $vkeys=$hash{"$scope:keys:$rid"};
3041: my @keys=split(/:/,$vkeys);
3042: my $key;
3043: $qresult.="$scope:keys=$vkeys&";
3044: foreach $key (@keys) {
3045: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
3046: }
3047: }
3048: if (untie(%hash)) {
3049: $qresult=~s/\&$//;
3050: &Reply( $client, "$qresult\n", $userinput);
3051: } else {
3052: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3053: "while attempting restore\n", $userinput);
3054: }
3055: } else {
3056: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3057: "while attempting restore\n", $userinput);
3058: }
3059:
3060: return 1;
3061:
3062:
3063: }
3064: ®ister_handler("restore", \&restore_handler, 0,1,0);
3065:
3066: #
3067: # Add a chat message to to a discussion board.
3068: #
3069: # Parameters:
3070: # $cmd - Request keyword.
3071: # $tail - Tail of the command. A colon separated list
3072: # containing:
3073: # cdom - Domain on which the chat board lives
3074: # cnum - Identifier of the discussion group.
3075: # post - Body of the posting.
3076: # $client - Socket open on the client.
3077: # Returns:
3078: # 1 - Indicating caller should keep on processing.
3079: #
3080: # Side-effects:
3081: # writes a reply to the client.
3082: #
3083: #
3084: sub send_chat_handler {
3085: my ($cmd, $tail, $client) = @_;
3086:
3087:
3088: my $userinput = "$cmd:$tail";
3089:
3090: my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
3091: &chat_add($cdom,$cnum,$newpost);
3092: &Reply($client, "ok\n", $userinput);
3093:
3094: return 1;
3095: }
3096: ®ister_handler("chatsend", \&send_chat_handler, 0, 1, 0);
3097:
3098: #
3099: # Retrieve the set of chat messagss from a discussion board.
3100: #
3101: # Parameters:
3102: # $cmd - Command keyword that initiated the request.
3103: # $tail - Remainder of the request after the command
3104: # keyword. In this case a colon separated list of
3105: # chat domain - Which discussion board.
3106: # chat id - Discussion thread(?)
3107: # domain/user - Authentication domain and username
3108: # of the requesting person.
3109: # $client - Socket open on the client program.
3110: # Returns:
3111: # 1 - continue processing
3112: # Side effects:
3113: # Response is written to the client.
3114: #
3115: sub retrieve_chat_handler {
3116: my ($cmd, $tail, $client) = @_;
3117:
3118:
3119: my $userinput = "$cmd:$tail";
3120:
3121: my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
3122: my $reply='';
3123: foreach (&get_chat($cdom,$cnum,$udom,$uname)) {
3124: $reply.=&escape($_).':';
3125: }
3126: $reply=~s/\:$//;
3127: &Reply($client, $reply."\n", $userinput);
3128:
3129:
3130: return 1;
3131: }
3132: ®ister_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
3133:
3134: #
3135: # Initiate a query of an sql database. SQL query repsonses get put in
3136: # a file for later retrieval. This prevents sql query results from
3137: # bottlenecking the system. Note that with loncnew, perhaps this is
3138: # less of an issue since multiple outstanding requests can be concurrently
3139: # serviced.
3140: #
3141: # Parameters:
3142: # $cmd - COmmand keyword that initiated the request.
3143: # $tail - Remainder of the command after the keyword.
3144: # For this function, this consists of a query and
3145: # 3 arguments that are self-documentingly labelled
3146: # in the original arg1, arg2, arg3.
3147: # $client - Socket open on the client.
3148: # Return:
3149: # 1 - Indicating processing should continue.
3150: # Side-effects:
3151: # a reply is written to $client.
3152: #
3153: sub send_query_handler {
3154: my ($cmd, $tail, $client) = @_;
3155:
3156:
3157: my $userinput = "$cmd:$tail";
3158:
3159: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
3160: $query=~s/\n*$//g;
3161: &Reply($client, "". &sql_reply("$clientname\&$query".
3162: "\&$arg1"."\&$arg2"."\&$arg3")."\n",
3163: $userinput);
3164:
3165: return 1;
3166: }
3167: ®ister_handler("querysend", \&send_query_handler, 0, 1, 0);
3168:
3169: #
3170: # Add a reply to an sql query. SQL queries are done asyncrhonously.
3171: # The query is submitted via a "querysend" transaction.
3172: # There it is passed on to the lonsql daemon, queued and issued to
3173: # mysql.
3174: # This transaction is invoked when the sql transaction is complete
3175: # it stores the query results in flie and indicates query completion.
3176: # presumably local software then fetches this response... I'm guessing
3177: # the sequence is: lonc does a querysend, we ask lonsql to do it.
3178: # lonsql on completion of the query interacts with the lond of our
3179: # client to do a query reply storing two files:
3180: # - id - The results of the query.
3181: # - id.end - Indicating the transaction completed.
3182: # NOTE: id is a unique id assigned to the query and querysend time.
3183: # Parameters:
3184: # $cmd - Command keyword that initiated this request.
3185: # $tail - Remainder of the tail. In this case that's a colon
3186: # separated list containing the query Id and the
3187: # results of the query.
3188: # $client - Socket open on the client.
3189: # Return:
3190: # 1 - Indicating that we should continue processing.
3191: # Side effects:
3192: # ok written to the client.
3193: #
3194: sub reply_query_handler {
3195: my ($cmd, $tail, $client) = @_;
3196:
3197:
3198: my $userinput = "$cmd:$tail";
3199:
3200: my ($cmd,$id,$reply)=split(/:/,$userinput);
3201: my $store;
3202: my $execdir=$perlvar{'lonDaemons'};
3203: if ($store=IO::File->new(">$execdir/tmp/$id")) {
3204: $reply=~s/\&/\n/g;
3205: print $store $reply;
3206: close $store;
3207: my $store2=IO::File->new(">$execdir/tmp/$id.end");
3208: print $store2 "done\n";
3209: close $store2;
3210: &Reply($client, "ok\n", $userinput);
3211: } else {
3212: &Failure($client, "error: ".($!+0)
3213: ." IO::File->new Failed ".
3214: "while attempting queryreply\n", $userinput);
3215: }
3216:
3217:
3218: return 1;
3219: }
3220: ®ister_handler("queryreply", \&reply_query_handler, 0, 1, 0);
3221:
3222: #
3223: # Process the courseidput request. Not quite sure what this means
3224: # at the system level sense. It appears a gdbm file in the
3225: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and
3226: # a set of entries made in that database.
3227: #
3228: # Parameters:
3229: # $cmd - The command keyword that initiated this request.
3230: # $tail - Tail of the command. In this case consists of a colon
3231: # separated list contaning the domain to apply this to and
3232: # an ampersand separated list of keyword=value pairs.
3233: # Each value is a colon separated list that includes:
3234: # description, institutional code and course owner.
3235: # For backward compatibility with versions included
3236: # in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
3237: # code and/or course owner are preserved from the existing
3238: # record when writing a new record in response to 1.1 or
3239: # 1.2 implementations of lonnet::flushcourselogs().
3240: #
3241: # $client - Socket open on the client.
3242: # Returns:
3243: # 1 - indicating that processing should continue
3244: #
3245: # Side effects:
3246: # reply is written to the client.
3247: #
3248: sub put_course_id_handler {
3249: my ($cmd, $tail, $client) = @_;
3250:
3251:
3252: my $userinput = "$cmd:$tail";
3253:
3254: my ($udom, $what) = split(/:/, $tail,2);
3255: chomp($what);
3256: my $now=time;
3257: my @pairs=split(/\&/,$what);
3258:
3259: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3260: if ($hashref) {
3261: foreach my $pair (@pairs) {
3262: my ($key,$courseinfo) = split(/=/,$pair,2);
3263: $courseinfo =~ s/=/:/g;
3264:
3265: my @current_items = split(/:/,$hashref->{$key});
3266: shift(@current_items); # remove description
3267: pop(@current_items); # remove last access
3268: my $numcurrent = scalar(@current_items);
3269:
3270: my @new_items = split(/:/,$courseinfo);
3271: my $numnew = scalar(@new_items);
3272: if ($numcurrent > 0) {
3273: if ($numnew == 1) { # flushcourselogs() from 1.1 or earlier
3274: $courseinfo .= ':'.join(':',@current_items);
3275: } elsif ($numnew == 2) { # flushcourselogs() from 1.2.X
3276: $courseinfo .= ':'.$current_items[$numcurrent-1];
3277: }
3278: }
3279: $hashref->{$key}=$courseinfo.':'.$now;
3280: }
3281: if (untie(%$hashref)) {
3282: &Reply( $client, "ok\n", $userinput);
3283: } else {
3284: &Failure($client, "error: ".($!+0)
3285: ." untie(GDBM) Failed ".
3286: "while attempting courseidput\n", $userinput);
3287: }
3288: } else {
3289: &Failure($client, "error: ".($!+0)
3290: ." tie(GDBM) Failed ".
3291: "while attempting courseidput\n", $userinput);
3292: }
3293:
3294:
3295: return 1;
3296: }
3297: ®ister_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
3298:
3299: # Retrieves the value of a course id resource keyword pattern
3300: # defined since a starting date. Both the starting date and the
3301: # keyword pattern are optional. If the starting date is not supplied it
3302: # is treated as the beginning of time. If the pattern is not found,
3303: # it is treatred as "." matching everything.
3304: #
3305: # Parameters:
3306: # $cmd - Command keyword that resulted in us being dispatched.
3307: # $tail - The remainder of the command that, in this case, consists
3308: # of a colon separated list of:
3309: # domain - The domain in which the course database is
3310: # defined.
3311: # since - Optional parameter describing the minimum
3312: # time of definition(?) of the resources that
3313: # will match the dump.
3314: # description - regular expression that is used to filter
3315: # the dump. Only keywords matching this regexp
3316: # will be used.
3317: # institutional code - optional supplied code to filter
3318: # the dump. Only courses with an institutional code
3319: # that match the supplied code will be returned.
3320: # owner - optional supplied username of owner to filter
3321: # the dump. Only courses for which the course
3322: # owner matches the supplied username will be
3323: # returned. Implicit assumption that owner
3324: # is a user in the domain in which the
3325: # course database is defined.
3326: # $client - The socket open on the client.
3327: # Returns:
3328: # 1 - Continue processing.
3329: # Side Effects:
3330: # a reply is written to $client.
3331: sub dump_course_id_handler {
3332: my ($cmd, $tail, $client) = @_;
3333:
3334: my $userinput = "$cmd:$tail";
3335:
3336: my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter) =split(/:/,$tail);
3337: if (defined($description)) {
3338: $description=&unescape($description);
3339: } else {
3340: $description='.';
3341: }
3342: if (defined($instcodefilter)) {
3343: $instcodefilter=&unescape($instcodefilter);
3344: } else {
3345: $instcodefilter='.';
3346: }
3347: if (defined($ownerfilter)) {
3348: $ownerfilter=&unescape($ownerfilter);
3349: } else {
3350: $ownerfilter='.';
3351: }
3352: if (defined($coursefilter)) {
3353: $coursefilter=&unescape($coursefilter);
3354: } else {
3355: $coursefilter='.';
3356: }
3357:
3358: unless (defined($since)) { $since=0; }
3359: my $qresult='';
3360: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3361: if ($hashref) {
3362: while (my ($key,$value) = each(%$hashref)) {
3363: my ($descr,$lasttime,$inst_code,$owner);
3364: my @courseitems = split(/:/,$value);
3365: $lasttime = pop(@courseitems);
3366: ($descr,$inst_code,$owner)=@courseitems;
3367: if ($lasttime<$since) { next; }
3368: my $match = 1;
3369: unless ($description eq '.') {
3370: my $unescapeDescr = &unescape($descr);
3371: unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
3372: $match = 0;
3373: }
3374: }
3375: unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
3376: my $unescapeInstcode = &unescape($inst_code);
3377: unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) {
3378: $match = 0;
3379: }
3380: }
3381: unless ($ownerfilter eq '.' || !defined($ownerfilter)) {
3382: my $unescapeOwner = &unescape($owner);
3383: unless (eval('$unescapeOwner=~/\Q$ownerfilter\E/i')) {
3384: $match = 0;
3385: }
3386: }
3387: unless ($coursefilter eq '.' || !defined($coursefilter)) {
3388: my $unescapeCourse = &unescape($key);
3389: unless (eval('$unescapeCourse=~/^$udom(_)\Q$coursefilter\E$/')) {
3390: $match = 0;
3391: }
3392: }
3393: if ($match == 1) {
3394: $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
3395: }
3396: }
3397: if (untie(%$hashref)) {
3398: chop($qresult);
3399: &Reply($client, "$qresult\n", $userinput);
3400: } else {
3401: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3402: "while attempting courseiddump\n", $userinput);
3403: }
3404: } else {
3405: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3406: "while attempting courseiddump\n", $userinput);
3407: }
3408:
3409:
3410: return 1;
3411: }
3412: ®ister_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
3413:
3414: #
3415: # Puts an id to a domains id database.
3416: #
3417: # Parameters:
3418: # $cmd - The command that triggered us.
3419: # $tail - Remainder of the request other than the command. This is a
3420: # colon separated list containing:
3421: # $domain - The domain for which we are writing the id.
3422: # $pairs - The id info to write... this is and & separated list
3423: # of keyword=value.
3424: # $client - Socket open on the client.
3425: # Returns:
3426: # 1 - Continue processing.
3427: # Side effects:
3428: # reply is written to $client.
3429: #
3430: sub put_id_handler {
3431: my ($cmd,$tail,$client) = @_;
3432:
3433:
3434: my $userinput = "$cmd:$tail";
3435:
3436: my ($udom,$what)=split(/:/,$tail);
3437: chomp($what);
3438: my @pairs=split(/\&/,$what);
3439: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
3440: "P", $what);
3441: if ($hashref) {
3442: foreach my $pair (@pairs) {
3443: my ($key,$value)=split(/=/,$pair);
3444: $hashref->{$key}=$value;
3445: }
3446: if (untie(%$hashref)) {
3447: &Reply($client, "ok\n", $userinput);
3448: } else {
3449: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3450: "while attempting idput\n", $userinput);
3451: }
3452: } else {
3453: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3454: "while attempting idput\n", $userinput);
3455: }
3456:
3457: return 1;
3458: }
3459: ®ister_handler("idput", \&put_id_handler, 0, 1, 0);
3460:
3461: #
3462: # Retrieves a set of id values from the id database.
3463: # Returns an & separated list of results, one for each requested id to the
3464: # client.
3465: #
3466: # Parameters:
3467: # $cmd - Command keyword that caused us to be dispatched.
3468: # $tail - Tail of the command. Consists of a colon separated:
3469: # domain - the domain whose id table we dump
3470: # ids Consists of an & separated list of
3471: # id keywords whose values will be fetched.
3472: # nonexisting keywords will have an empty value.
3473: # $client - Socket open on the client.
3474: #
3475: # Returns:
3476: # 1 - indicating processing should continue.
3477: # Side effects:
3478: # An & separated list of results is written to $client.
3479: #
3480: sub get_id_handler {
3481: my ($cmd, $tail, $client) = @_;
3482:
3483:
3484: my $userinput = "$client:$tail";
3485:
3486: my ($udom,$what)=split(/:/,$tail);
3487: chomp($what);
3488: my @queries=split(/\&/,$what);
3489: my $qresult='';
3490: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
3491: if ($hashref) {
3492: for (my $i=0;$i<=$#queries;$i++) {
3493: $qresult.="$hashref->{$queries[$i]}&";
3494: }
3495: if (untie(%$hashref)) {
3496: $qresult=~s/\&$//;
3497: &Reply($client, "$qresult\n", $userinput);
3498: } else {
3499: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
3500: "while attempting idget\n",$userinput);
3501: }
3502: } else {
3503: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3504: "while attempting idget\n",$userinput);
3505: }
3506:
3507: return 1;
3508: }
3509: ®ister_handler("idget", \&get_id_handler, 0, 1, 0);
3510:
3511: #
3512: # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database
3513: #
3514: # Parameters
3515: # $cmd - Command keyword that caused us to be dispatched.
3516: # $tail - Tail of the command. Consists of a colon separated:
3517: # domain - the domain whose dcmail we are recording
3518: # email Consists of key=value pair
3519: # where key is unique msgid
3520: # and value is message (in XML)
3521: # $client - Socket open on the client.
3522: #
3523: # Returns:
3524: # 1 - indicating processing should continue.
3525: # Side effects
3526: # reply is written to $client.
3527: #
3528: sub put_dcmail_handler {
3529: my ($cmd,$tail,$client) = @_;
3530: my $userinput = "$cmd:$tail";
3531:
3532: my ($udom,$what)=split(/:/,$tail);
3533: chomp($what);
3534: my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
3535: if ($hashref) {
3536: my ($key,$value)=split(/=/,$what);
3537: $hashref->{$key}=$value;
3538: }
3539: if (untie(%$hashref)) {
3540: &Reply($client, "ok\n", $userinput);
3541: } else {
3542: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3543: "while attempting dcmailput\n", $userinput);
3544: }
3545: return 1;
3546: }
3547: ®ister_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
3548:
3549: #
3550: # Retrieves broadcast e-mail from nohist_dcmail database
3551: # Returns to client an & separated list of key=value pairs,
3552: # where key is msgid and value is message information.
3553: #
3554: # Parameters
3555: # $cmd - Command keyword that caused us to be dispatched.
3556: # $tail - Tail of the command. Consists of a colon separated:
3557: # domain - the domain whose dcmail table we dump
3558: # startfilter - beginning of time window
3559: # endfilter - end of time window
3560: # sendersfilter - & separated list of username:domain
3561: # for senders to search for.
3562: # $client - Socket open on the client.
3563: #
3564: # Returns:
3565: # 1 - indicating processing should continue.
3566: # Side effects
3567: # reply (& separated list of msgid=messageinfo pairs) is
3568: # written to $client.
3569: #
3570: sub dump_dcmail_handler {
3571: my ($cmd, $tail, $client) = @_;
3572:
3573: my $userinput = "$cmd:$tail";
3574: my ($udom,$startfilter,$endfilter,$sendersfilter) = split(/:/,$tail);
3575: chomp($sendersfilter);
3576: my @senders = ();
3577: if (defined($startfilter)) {
3578: $startfilter=&unescape($startfilter);
3579: } else {
3580: $startfilter='.';
3581: }
3582: if (defined($endfilter)) {
3583: $endfilter=&unescape($endfilter);
3584: } else {
3585: $endfilter='.';
3586: }
3587: if (defined($sendersfilter)) {
3588: $sendersfilter=&unescape($sendersfilter);
3589: @senders = map { &unescape($_) } split(/\&/,$sendersfilter);
3590: }
3591:
3592: my $qresult='';
3593: my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
3594: if ($hashref) {
3595: while (my ($key,$value) = each(%$hashref)) {
3596: my $match = 1;
3597: my ($timestamp,$subj,$uname,$udom) =
3598: split(/:/,&unescape(&unescape($key)),5); # yes, twice really
3599: $subj = &unescape($subj);
3600: unless ($startfilter eq '.' || !defined($startfilter)) {
3601: if ($timestamp < $startfilter) {
3602: $match = 0;
3603: }
3604: }
3605: unless ($endfilter eq '.' || !defined($endfilter)) {
3606: if ($timestamp > $endfilter) {
3607: $match = 0;
3608: }
3609: }
3610: unless (@senders < 1) {
3611: unless (grep/^$uname:$udom$/,@senders) {
3612: $match = 0;
3613: }
3614: }
3615: if ($match == 1) {
3616: $qresult.=$key.'='.$value.'&';
3617: }
3618: }
3619: if (untie(%$hashref)) {
3620: chop($qresult);
3621: &Reply($client, "$qresult\n", $userinput);
3622: } else {
3623: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3624: "while attempting dcmaildump\n", $userinput);
3625: }
3626: } else {
3627: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3628: "while attempting dcmaildump\n", $userinput);
3629: }
3630: return 1;
3631: }
3632:
3633: ®ister_handler("dcmaildump", \&dump_dcmail_handler, 0, 1, 0);
3634:
3635: #
3636: # Puts domain roles in nohist_domainroles database
3637: #
3638: # Parameters
3639: # $cmd - Command keyword that caused us to be dispatched.
3640: # $tail - Tail of the command. Consists of a colon separated:
3641: # domain - the domain whose roles we are recording
3642: # role - Consists of key=value pair
3643: # where key is unique role
3644: # and value is start/end date information
3645: # $client - Socket open on the client.
3646: #
3647: # Returns:
3648: # 1 - indicating processing should continue.
3649: # Side effects
3650: # reply is written to $client.
3651: #
3652:
3653: sub put_domainroles_handler {
3654: my ($cmd,$tail,$client) = @_;
3655:
3656: my $userinput = "$cmd:$tail";
3657: my ($udom,$what)=split(/:/,$tail);
3658: chomp($what);
3659: my @pairs=split(/\&/,$what);
3660: my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
3661: if ($hashref) {
3662: foreach my $pair (@pairs) {
3663: my ($key,$value)=split(/=/,$pair);
3664: $hashref->{$key}=$value;
3665: }
3666: if (untie(%$hashref)) {
3667: &Reply($client, "ok\n", $userinput);
3668: } else {
3669: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3670: "while attempting domroleput\n", $userinput);
3671: }
3672: } else {
3673: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3674: "while attempting domroleput\n", $userinput);
3675: }
3676:
3677: return 1;
3678: }
3679:
3680: ®ister_handler("domroleput", \&put_domainroles_handler, 0, 1, 0);
3681:
3682: #
3683: # Retrieves domain roles from nohist_domainroles database
3684: # Returns to client an & separated list of key=value pairs,
3685: # where key is role and value is start and end date information.
3686: #
3687: # Parameters
3688: # $cmd - Command keyword that caused us to be dispatched.
3689: # $tail - Tail of the command. Consists of a colon separated:
3690: # domain - the domain whose domain roles table we dump
3691: # $client - Socket open on the client.
3692: #
3693: # Returns:
3694: # 1 - indicating processing should continue.
3695: # Side effects
3696: # reply (& separated list of role=start/end info pairs) is
3697: # written to $client.
3698: #
3699: sub dump_domainroles_handler {
3700: my ($cmd, $tail, $client) = @_;
3701:
3702: my $userinput = "$cmd:$tail";
3703: my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail);
3704: chomp($rolesfilter);
3705: my @roles = ();
3706: if (defined($startfilter)) {
3707: $startfilter=&unescape($startfilter);
3708: } else {
3709: $startfilter='.';
3710: }
3711: if (defined($endfilter)) {
3712: $endfilter=&unescape($endfilter);
3713: } else {
3714: $endfilter='.';
3715: }
3716: if (defined($rolesfilter)) {
3717: $rolesfilter=&unescape($rolesfilter);
3718: @roles = split(/\&/,$rolesfilter);
3719: }
3720:
3721: my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
3722: if ($hashref) {
3723: my $qresult = '';
3724: while (my ($key,$value) = each(%$hashref)) {
3725: my $match = 1;
3726: my ($start,$end) = split(/:/,&unescape($value));
3727: my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
3728: unless ($startfilter eq '.' || !defined($startfilter)) {
3729: if ($start >= $startfilter) {
3730: $match = 0;
3731: }
3732: }
3733: unless ($endfilter eq '.' || !defined($endfilter)) {
3734: if ($end <= $endfilter) {
3735: $match = 0;
3736: }
3737: }
3738: unless (@roles < 1) {
3739: unless (grep/^$trole$/,@roles) {
3740: $match = 0;
3741: }
3742: }
3743: if ($match == 1) {
3744: $qresult.=$key.'='.$value.'&';
3745: }
3746: }
3747: if (untie(%$hashref)) {
3748: chop($qresult);
3749: &Reply($client, "$qresult\n", $userinput);
3750: } else {
3751: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3752: "while attempting domrolesdump\n", $userinput);
3753: }
3754: } else {
3755: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3756: "while attempting domrolesdump\n", $userinput);
3757: }
3758: return 1;
3759: }
3760:
3761: ®ister_handler("domrolesdump", \&dump_domainroles_handler, 0, 1, 0);
3762:
3763:
3764: # Process the tmpput command I'm not sure what this does.. Seems to
3765: # create a file in the lonDaemons/tmp directory of the form $id.tmp
3766: # where Id is the client's ip concatenated with a sequence number.
3767: # The file will contain some value that is passed in. Is this e.g.
3768: # a login token?
3769: #
3770: # Parameters:
3771: # $cmd - The command that got us dispatched.
3772: # $tail - The remainder of the request following $cmd:
3773: # In this case this will be the contents of the file.
3774: # $client - Socket connected to the client.
3775: # Returns:
3776: # 1 indicating processing can continue.
3777: # Side effects:
3778: # A file is created in the local filesystem.
3779: # A reply is sent to the client.
3780: sub tmp_put_handler {
3781: my ($cmd, $what, $client) = @_;
3782:
3783: my $userinput = "$cmd:$what"; # Reconstruct for logging.
3784:
3785:
3786: my $store;
3787: $tmpsnum++;
3788: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
3789: $id=~s/\W/\_/g;
3790: $what=~s/\n//g;
3791: my $execdir=$perlvar{'lonDaemons'};
3792: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
3793: print $store $what;
3794: close $store;
3795: &Reply($client, "$id\n", $userinput);
3796: } else {
3797: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
3798: "while attempting tmpput\n", $userinput);
3799: }
3800: return 1;
3801:
3802: }
3803: ®ister_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
3804:
3805: # Processes the tmpget command. This command returns the contents
3806: # of a temporary resource file(?) created via tmpput.
3807: #
3808: # Paramters:
3809: # $cmd - Command that got us dispatched.
3810: # $id - Tail of the command, contain the id of the resource
3811: # we want to fetch.
3812: # $client - socket open on the client.
3813: # Return:
3814: # 1 - Inidcating processing can continue.
3815: # Side effects:
3816: # A reply is sent to the client.
3817: #
3818: sub tmp_get_handler {
3819: my ($cmd, $id, $client) = @_;
3820:
3821: my $userinput = "$cmd:$id";
3822:
3823:
3824: $id=~s/\W/\_/g;
3825: my $store;
3826: my $execdir=$perlvar{'lonDaemons'};
3827: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
3828: my $reply=<$store>;
3829: &Reply( $client, "$reply\n", $userinput);
3830: close $store;
3831: } else {
3832: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
3833: "while attempting tmpget\n", $userinput);
3834: }
3835:
3836: return 1;
3837: }
3838: ®ister_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
3839:
3840: #
3841: # Process the tmpdel command. This command deletes a temp resource
3842: # created by the tmpput command.
3843: #
3844: # Parameters:
3845: # $cmd - Command that got us here.
3846: # $id - Id of the temporary resource created.
3847: # $client - socket open on the client process.
3848: #
3849: # Returns:
3850: # 1 - Indicating processing should continue.
3851: # Side Effects:
3852: # A file is deleted
3853: # A reply is sent to the client.
3854: sub tmp_del_handler {
3855: my ($cmd, $id, $client) = @_;
3856:
3857: my $userinput= "$cmd:$id";
3858:
3859: chomp($id);
3860: $id=~s/\W/\_/g;
3861: my $execdir=$perlvar{'lonDaemons'};
3862: if (unlink("$execdir/tmp/$id.tmp")) {
3863: &Reply($client, "ok\n", $userinput);
3864: } else {
3865: &Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
3866: "while attempting tmpdel\n", $userinput);
3867: }
3868:
3869: return 1;
3870:
3871: }
3872: ®ister_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
3873:
3874: #
3875: # Processes the setannounce command. This command
3876: # creates a file named announce.txt in the top directory of
3877: # the documentn root and sets its contents. The announce.txt file is
3878: # printed in its entirety at the LonCAPA login page. Note:
3879: # once the announcement.txt fileis created it cannot be deleted.
3880: # However, setting the contents of the file to empty removes the
3881: # announcement from the login page of loncapa so who cares.
3882: #
3883: # Parameters:
3884: # $cmd - The command that got us dispatched.
3885: # $announcement - The text of the announcement.
3886: # $client - Socket open on the client process.
3887: # Retunrns:
3888: # 1 - Indicating request processing should continue
3889: # Side Effects:
3890: # The file {DocRoot}/announcement.txt is created.
3891: # A reply is sent to $client.
3892: #
3893: sub set_announce_handler {
3894: my ($cmd, $announcement, $client) = @_;
3895:
3896: my $userinput = "$cmd:$announcement";
3897:
3898: chomp($announcement);
3899: $announcement=&unescape($announcement);
3900: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
3901: '/announcement.txt')) {
3902: print $store $announcement;
3903: close $store;
3904: &Reply($client, "ok\n", $userinput);
3905: } else {
3906: &Failure($client, "error: ".($!+0)."\n", $userinput);
3907: }
3908:
3909: return 1;
3910: }
3911: ®ister_handler("setannounce", \&set_announce_handler, 0, 1, 0);
3912:
3913: #
3914: # Return the version of the daemon. This can be used to determine
3915: # the compatibility of cross version installations or, alternatively to
3916: # simply know who's out of date and who isn't. Note that the version
3917: # is returned concatenated with the tail.
3918: # Parameters:
3919: # $cmd - the request that dispatched to us.
3920: # $tail - Tail of the request (client's version?).
3921: # $client - Socket open on the client.
3922: #Returns:
3923: # 1 - continue processing requests.
3924: # Side Effects:
3925: # Replies with version to $client.
3926: sub get_version_handler {
3927: my ($cmd, $tail, $client) = @_;
3928:
3929: my $userinput = $cmd.$tail;
3930:
3931: &Reply($client, &version($userinput)."\n", $userinput);
3932:
3933:
3934: return 1;
3935: }
3936: ®ister_handler("version", \&get_version_handler, 0, 1, 0);
3937:
3938: # Set the current host and domain. This is used to support
3939: # multihomed systems. Each IP of the system, or even separate daemons
3940: # on the same IP can be treated as handling a separate lonCAPA virtual
3941: # machine. This command selects the virtual lonCAPA. The client always
3942: # knows the right one since it is lonc and it is selecting the domain/system
3943: # from the hosts.tab file.
3944: # Parameters:
3945: # $cmd - Command that dispatched us.
3946: # $tail - Tail of the command (domain/host requested).
3947: # $socket - Socket open on the client.
3948: #
3949: # Returns:
3950: # 1 - Indicates the program should continue to process requests.
3951: # Side-effects:
3952: # The default domain/system context is modified for this daemon.
3953: # a reply is sent to the client.
3954: #
3955: sub set_virtual_host_handler {
3956: my ($cmd, $tail, $socket) = @_;
3957:
3958: my $userinput ="$cmd:$tail";
3959:
3960: &Reply($client, &sethost($userinput)."\n", $userinput);
3961:
3962:
3963: return 1;
3964: }
3965: ®ister_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
3966:
3967: # Process a request to exit:
3968: # - "bye" is sent to the client.
3969: # - The client socket is shutdown and closed.
3970: # - We indicate to the caller that we should exit.
3971: # Formal Parameters:
3972: # $cmd - The command that got us here.
3973: # $tail - Tail of the command (empty).
3974: # $client - Socket open on the tail.
3975: # Returns:
3976: # 0 - Indicating the program should exit!!
3977: #
3978: sub exit_handler {
3979: my ($cmd, $tail, $client) = @_;
3980:
3981: my $userinput = "$cmd:$tail";
3982:
3983: &logthis("Client $clientip ($clientname) hanging up: $userinput");
3984: &Reply($client, "bye\n", $userinput);
3985: $client->shutdown(2); # shutdown the socket forcibly.
3986: $client->close();
3987:
3988: return 0;
3989: }
3990: ®ister_handler("exit", \&exit_handler, 0,1,1);
3991: ®ister_handler("init", \&exit_handler, 0,1,1);
3992: ®ister_handler("quit", \&exit_handler, 0,1,1);
3993:
3994: # Determine if auto-enrollment is enabled.
3995: # Note that the original had what I believe to be a defect.
3996: # The original returned 0 if the requestor was not a registerd client.
3997: # It should return "refused".
3998: # Formal Parameters:
3999: # $cmd - The command that invoked us.
4000: # $tail - The tail of the command (Extra command parameters.
4001: # $client - The socket open on the client that issued the request.
4002: # Returns:
4003: # 1 - Indicating processing should continue.
4004: #
4005: sub enrollment_enabled_handler {
4006: my ($cmd, $tail, $client) = @_;
4007: my $userinput = $cmd.":".$tail; # For logging purposes.
4008:
4009:
4010: my $cdom = split(/:/, $tail); # Domain we're asking about.
4011: my $outcome = &localenroll::run($cdom);
4012: &Reply($client, "$outcome\n", $userinput);
4013:
4014: return 1;
4015: }
4016: ®ister_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
4017:
4018: # Get the official sections for which auto-enrollment is possible.
4019: # Since the admin people won't know about 'unofficial sections'
4020: # we cannot auto-enroll on them.
4021: # Formal Parameters:
4022: # $cmd - The command request that got us dispatched here.
4023: # $tail - The remainder of the request. In our case this
4024: # will be split into:
4025: # $coursecode - The course name from the admin point of view.
4026: # $cdom - The course's domain(?).
4027: # $client - Socket open on the client.
4028: # Returns:
4029: # 1 - Indiciting processing should continue.
4030: #
4031: sub get_sections_handler {
4032: my ($cmd, $tail, $client) = @_;
4033: my $userinput = "$cmd:$tail";
4034:
4035: my ($coursecode, $cdom) = split(/:/, $tail);
4036: my @secs = &localenroll::get_sections($coursecode,$cdom);
4037: my $seclist = &escape(join(':',@secs));
4038:
4039: &Reply($client, "$seclist\n", $userinput);
4040:
4041:
4042: return 1;
4043: }
4044: ®ister_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
4045:
4046: # Validate the owner of a new course section.
4047: #
4048: # Formal Parameters:
4049: # $cmd - Command that got us dispatched.
4050: # $tail - the remainder of the command. For us this consists of a
4051: # colon separated string containing:
4052: # $inst - Course Id from the institutions point of view.
4053: # $owner - Proposed owner of the course.
4054: # $cdom - Domain of the course (from the institutions
4055: # point of view?)..
4056: # $client - Socket open on the client.
4057: #
4058: # Returns:
4059: # 1 - Processing should continue.
4060: #
4061: sub validate_course_owner_handler {
4062: my ($cmd, $tail, $client) = @_;
4063: my $userinput = "$cmd:$tail";
4064: my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
4065:
4066: my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
4067: &Reply($client, "$outcome\n", $userinput);
4068:
4069:
4070:
4071: return 1;
4072: }
4073: ®ister_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
4074:
4075: #
4076: # Validate a course section in the official schedule of classes
4077: # from the institutions point of view (part of autoenrollment).
4078: #
4079: # Formal Parameters:
4080: # $cmd - The command request that got us dispatched.
4081: # $tail - The tail of the command. In this case,
4082: # this is a colon separated set of words that will be split
4083: # into:
4084: # $inst_course_id - The course/section id from the
4085: # institutions point of view.
4086: # $cdom - The domain from the institutions
4087: # point of view.
4088: # $client - Socket open on the client.
4089: # Returns:
4090: # 1 - Indicating processing should continue.
4091: #
4092: sub validate_course_section_handler {
4093: my ($cmd, $tail, $client) = @_;
4094: my $userinput = "$cmd:$tail";
4095: my ($inst_course_id, $cdom) = split(/:/, $tail);
4096:
4097: my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
4098: &Reply($client, "$outcome\n", $userinput);
4099:
4100:
4101: return 1;
4102: }
4103: ®ister_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
4104:
4105: #
4106: # Create a password for a new auto-enrollment user.
4107: # I think/guess, this password allows access to the institutions
4108: # AIS class list server/services. Stuart can correct this comment
4109: # when he finds out how wrong I am.
4110: #
4111: # Formal Parameters:
4112: # $cmd - The command request that got us dispatched.
4113: # $tail - The tail of the command. In this case this is a colon separated
4114: # set of words that will be split into:
4115: # $authparam - An authentication parameter (username??).
4116: # $cdom - The domain of the course from the institution's
4117: # point of view.
4118: # $client - The socket open on the client.
4119: # Returns:
4120: # 1 - continue processing.
4121: #
4122: sub create_auto_enroll_password_handler {
4123: my ($cmd, $tail, $client) = @_;
4124: my $userinput = "$cmd:$tail";
4125:
4126: my ($authparam, $cdom) = split(/:/, $userinput);
4127:
4128: my ($create_passwd,$authchk);
4129: ($authparam,
4130: $create_passwd,
4131: $authchk) = &localenroll::create_password($authparam,$cdom);
4132:
4133: &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
4134: $userinput);
4135:
4136:
4137: return 1;
4138: }
4139: ®ister_handler("autocreatepassword", \&create_auto_enroll_password_handler,
4140: 0, 1, 0);
4141:
4142: # Retrieve and remove temporary files created by/during autoenrollment.
4143: #
4144: # Formal Parameters:
4145: # $cmd - The command that got us dispatched.
4146: # $tail - The tail of the command. In our case this is a colon
4147: # separated list that will be split into:
4148: # $filename - The name of the file to remove.
4149: # The filename is given as a path relative to
4150: # the LonCAPA temp file directory.
4151: # $client - Socket open on the client.
4152: #
4153: # Returns:
4154: # 1 - Continue processing.
4155: sub retrieve_auto_file_handler {
4156: my ($cmd, $tail, $client) = @_;
4157: my $userinput = "cmd:$tail";
4158:
4159: my ($filename) = split(/:/, $tail);
4160:
4161: my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
4162: if ( (-e $source) && ($filename ne '') ) {
4163: my $reply = '';
4164: if (open(my $fh,$source)) {
4165: while (<$fh>) {
4166: chomp($_);
4167: $_ =~ s/^\s+//g;
4168: $_ =~ s/\s+$//g;
4169: $reply .= $_;
4170: }
4171: close($fh);
4172: &Reply($client, &escape($reply)."\n", $userinput);
4173:
4174: # Does this have to be uncommented??!? (RF).
4175: #
4176: # unlink($source);
4177: } else {
4178: &Failure($client, "error\n", $userinput);
4179: }
4180: } else {
4181: &Failure($client, "error\n", $userinput);
4182: }
4183:
4184:
4185: return 1;
4186: }
4187: ®ister_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
4188:
4189: #
4190: # Read and retrieve institutional code format (for support form).
4191: # Formal Parameters:
4192: # $cmd - Command that dispatched us.
4193: # $tail - Tail of the command. In this case it conatins
4194: # the course domain and the coursename.
4195: # $client - Socket open on the client.
4196: # Returns:
4197: # 1 - Continue processing.
4198: #
4199: sub get_institutional_code_format_handler {
4200: my ($cmd, $tail, $client) = @_;
4201: my $userinput = "$cmd:$tail";
4202:
4203: my $reply;
4204: my($cdom,$course) = split(/:/,$tail);
4205: my @pairs = split/\&/,$course;
4206: my %instcodes = ();
4207: my %codes = ();
4208: my @codetitles = ();
4209: my %cat_titles = ();
4210: my %cat_order = ();
4211: foreach (@pairs) {
4212: my ($key,$value) = split/=/,$_;
4213: $instcodes{&unescape($key)} = &unescape($value);
4214: }
4215: my $formatreply = &localenroll::instcode_format($cdom,
4216: \%instcodes,
4217: \%codes,
4218: \@codetitles,
4219: \%cat_titles,
4220: \%cat_order);
4221: if ($formatreply eq 'ok') {
4222: my $codes_str = &hash2str(%codes);
4223: my $codetitles_str = &array2str(@codetitles);
4224: my $cat_titles_str = &hash2str(%cat_titles);
4225: my $cat_order_str = &hash2str(%cat_order);
4226: &Reply($client,
4227: $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
4228: .$cat_order_str."\n",
4229: $userinput);
4230: } else {
4231: # this else branch added by RF since if not ok, lonc will
4232: # hang waiting on reply until timeout.
4233: #
4234: &Reply($client, "format_error\n", $userinput);
4235: }
4236:
4237: return 1;
4238: }
4239: ®ister_handler("autoinstcodeformat",
4240: \&get_institutional_code_format_handler,0,1,0);
4241:
4242: #
4243: # Gets a student's photo to exist (in the correct image type) in the user's
4244: # directory.
4245: # Formal Parameters:
4246: # $cmd - The command request that got us dispatched.
4247: # $tail - A colon separated set of words that will be split into:
4248: # $domain - student's domain
4249: # $uname - student username
4250: # $type - image type desired
4251: # $client - The socket open on the client.
4252: # Returns:
4253: # 1 - continue processing.
4254: sub student_photo_handler {
4255: my ($cmd, $tail, $client) = @_;
4256: my ($domain,$uname,$type) = split(/:/, $tail);
4257:
4258: my $path=&propath($domain,$uname).
4259: '/userfiles/internal/studentphoto.'.$type;
4260: if (-e $path) {
4261: &Reply($client,"ok\n","$cmd:$tail");
4262: return 1;
4263: }
4264: &mkpath($path);
4265: my $file=&localstudentphoto::fetch($domain,$uname);
4266: if (!$file) {
4267: &Failure($client,"unavailable\n","$cmd:$tail");
4268: return 1;
4269: }
4270: if (!-e $path) { &convert_photo($file,$path); }
4271: if (-e $path) {
4272: &Reply($client,"ok\n","$cmd:$tail");
4273: return 1;
4274: }
4275: &Failure($client,"unable_to_convert\n","$cmd:$tail");
4276: return 1;
4277: }
4278: ®ister_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
4279:
4280: # mkpath makes all directories for a file, expects an absolute path with a
4281: # file or a trailing / if just a dir is passed
4282: # returns 1 on success 0 on failure
4283: sub mkpath {
4284: my ($file)=@_;
4285: my @parts=split(/\//,$file,-1);
4286: my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
4287: for (my $i=3;$i<= ($#parts-1);$i++) {
4288: $now.='/'.$parts[$i];
4289: if (!-e $now) {
4290: if (!mkdir($now,0770)) { return 0; }
4291: }
4292: }
4293: return 1;
4294: }
4295:
4296: #---------------------------------------------------------------
4297: #
4298: # Getting, decoding and dispatching requests:
4299: #
4300: #
4301: # Get a Request:
4302: # Gets a Request message from the client. The transaction
4303: # is defined as a 'line' of text. We remove the new line
4304: # from the text line.
4305: #
4306: sub get_request {
4307: my $input = <$client>;
4308: chomp($input);
4309:
4310: &Debug("get_request: Request = $input\n");
4311:
4312: &status('Processing '.$clientname.':'.$input);
4313:
4314: return $input;
4315: }
4316: #---------------------------------------------------------------
4317: #
4318: # Process a request. This sub should shrink as each action
4319: # gets farmed out into a separat sub that is registered
4320: # with the dispatch hash.
4321: #
4322: # Parameters:
4323: # user_input - The request received from the client (lonc).
4324: # Returns:
4325: # true to keep processing, false if caller should exit.
4326: #
4327: sub process_request {
4328: my ($userinput) = @_; # Easier for now to break style than to
4329: # fix all the userinput -> user_input.
4330: my $wasenc = 0; # True if request was encrypted.
4331: # ------------------------------------------------------------ See if encrypted
4332: if ($userinput =~ /^enc/) {
4333: $userinput = decipher($userinput);
4334: $wasenc=1;
4335: if(!$userinput) { # Cipher not defined.
4336: &Failure($client, "error: Encrypted data without negotated key\n");
4337: return 0;
4338: }
4339: }
4340: Debug("process_request: $userinput\n");
4341:
4342: #
4343: # The 'correct way' to add a command to lond is now to
4344: # write a sub to execute it and Add it to the command dispatch
4345: # hash via a call to register_handler.. The comments to that
4346: # sub should give you enough to go on to show how to do this
4347: # along with the examples that are building up as this code
4348: # is getting refactored. Until all branches of the
4349: # if/elseif monster below have been factored out into
4350: # separate procesor subs, if the dispatch hash is missing
4351: # the command keyword, we will fall through to the remainder
4352: # of the if/else chain below in order to keep this thing in
4353: # working order throughout the transmogrification.
4354:
4355: my ($command, $tail) = split(/:/, $userinput, 2);
4356: chomp($command);
4357: chomp($tail);
4358: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
4359: $command =~ s/(\r)//; # And this too for parameterless commands.
4360: if(!$tail) {
4361: $tail =""; # defined but blank.
4362: }
4363:
4364: &Debug("Command received: $command, encoded = $wasenc");
4365:
4366: if(defined $Dispatcher{$command}) {
4367:
4368: my $dispatch_info = $Dispatcher{$command};
4369: my $handler = $$dispatch_info[0];
4370: my $need_encode = $$dispatch_info[1];
4371: my $client_types = $$dispatch_info[2];
4372: Debug("Matched dispatch hash: mustencode: $need_encode "
4373: ."ClientType $client_types");
4374:
4375: # Validate the request:
4376:
4377: my $ok = 1;
4378: my $requesterprivs = 0;
4379: if(&isClient()) {
4380: $requesterprivs |= $CLIENT_OK;
4381: }
4382: if(&isManager()) {
4383: $requesterprivs |= $MANAGER_OK;
4384: }
4385: if($need_encode && (!$wasenc)) {
4386: Debug("Must encode but wasn't: $need_encode $wasenc");
4387: $ok = 0;
4388: }
4389: if(($client_types & $requesterprivs) == 0) {
4390: Debug("Client not privileged to do this operation");
4391: $ok = 0;
4392: }
4393:
4394: if($ok) {
4395: Debug("Dispatching to handler $command $tail");
4396: my $keep_going = &$handler($command, $tail, $client);
4397: return $keep_going;
4398: } else {
4399: Debug("Refusing to dispatch because client did not match requirements");
4400: Failure($client, "refused\n", $userinput);
4401: return 1;
4402: }
4403:
4404: }
4405:
4406: print $client "unknown_cmd\n";
4407: # -------------------------------------------------------------------- complete
4408: Debug("process_request - returning 1");
4409: return 1;
4410: }
4411: #
4412: # Decipher encoded traffic
4413: # Parameters:
4414: # input - Encoded data.
4415: # Returns:
4416: # Decoded data or undef if encryption key was not yet negotiated.
4417: # Implicit input:
4418: # cipher - This global holds the negotiated encryption key.
4419: #
4420: sub decipher {
4421: my ($input) = @_;
4422: my $output = '';
4423:
4424:
4425: if($cipher) {
4426: my($enc, $enclength, $encinput) = split(/:/, $input);
4427: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
4428: $output .=
4429: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
4430: }
4431: return substr($output, 0, $enclength);
4432: } else {
4433: return undef;
4434: }
4435: }
4436:
4437: #
4438: # Register a command processor. This function is invoked to register a sub
4439: # to process a request. Once registered, the ProcessRequest sub can automatically
4440: # dispatch requests to an appropriate sub, and do the top level validity checking
4441: # as well:
4442: # - Is the keyword recognized.
4443: # - Is the proper client type attempting the request.
4444: # - Is the request encrypted if it has to be.
4445: # Parameters:
4446: # $request_name - Name of the request being registered.
4447: # This is the command request that will match
4448: # against the hash keywords to lookup the information
4449: # associated with the dispatch information.
4450: # $procedure - Reference to a sub to call to process the request.
4451: # All subs get called as follows:
4452: # Procedure($cmd, $tail, $replyfd, $key)
4453: # $cmd - the actual keyword that invoked us.
4454: # $tail - the tail of the request that invoked us.
4455: # $replyfd- File descriptor connected to the client
4456: # $must_encode - True if the request must be encoded to be good.
4457: # $client_ok - True if it's ok for a client to request this.
4458: # $manager_ok - True if it's ok for a manager to request this.
4459: # Side effects:
4460: # - On success, the Dispatcher hash has an entry added for the key $RequestName
4461: # - On failure, the program will die as it's a bad internal bug to try to
4462: # register a duplicate command handler.
4463: #
4464: sub register_handler {
4465: my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_;
4466:
4467: # Don't allow duplication#
4468:
4469: if (defined $Dispatcher{$request_name}) {
4470: die "Attempting to define a duplicate request handler for $request_name\n";
4471: }
4472: # Build the client type mask:
4473:
4474: my $client_type_mask = 0;
4475: if($client_ok) {
4476: $client_type_mask |= $CLIENT_OK;
4477: }
4478: if($manager_ok) {
4479: $client_type_mask |= $MANAGER_OK;
4480: }
4481:
4482: # Enter the hash:
4483:
4484: my @entry = ($procedure, $must_encode, $client_type_mask);
4485:
4486: $Dispatcher{$request_name} = \@entry;
4487:
4488: }
4489:
4490:
4491: #------------------------------------------------------------------
4492:
4493:
4494:
4495:
4496: #
4497: # Convert an error return code from lcpasswd to a string value.
4498: #
4499: sub lcpasswdstrerror {
4500: my $ErrorCode = shift;
4501: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
4502: return "lcpasswd Unrecognized error return value ".$ErrorCode;
4503: } else {
4504: return $passwderrors[$ErrorCode];
4505: }
4506: }
4507:
4508: #
4509: # Convert an error return code from lcuseradd to a string value:
4510: #
4511: sub lcuseraddstrerror {
4512: my $ErrorCode = shift;
4513: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
4514: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
4515: } else {
4516: return $adderrors[$ErrorCode];
4517: }
4518: }
4519:
4520: # grabs exception and records it to log before exiting
4521: sub catchexception {
4522: my ($error)=@_;
4523: $SIG{'QUIT'}='DEFAULT';
4524: $SIG{__DIE__}='DEFAULT';
4525: &status("Catching exception");
4526: &logthis("<font color='red'>CRITICAL: "
4527: ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
4528: ."a crash with this error msg->[$error]</font>");
4529: &logthis('Famous last words: '.$status.' - '.$lastlog);
4530: if ($client) { print $client "error: $error\n"; }
4531: $server->close();
4532: die($error);
4533: }
4534: sub timeout {
4535: &status("Handling Timeout");
4536: &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
4537: &catchexception('Timeout');
4538: }
4539: # -------------------------------- Set signal handlers to record abnormal exits
4540:
4541:
4542: $SIG{'QUIT'}=\&catchexception;
4543: $SIG{__DIE__}=\&catchexception;
4544:
4545: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
4546: &status("Read loncapa.conf and loncapa_apache.conf");
4547: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
4548: %perlvar=%{$perlvarref};
4549: undef $perlvarref;
4550:
4551: # ----------------------------- Make sure this process is running from user=www
4552: my $wwwid=getpwnam('www');
4553: if ($wwwid!=$<) {
4554: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
4555: my $subj="LON: $currenthostid User ID mismatch";
4556: system("echo 'User ID mismatch. lond must be run as user www.' |\
4557: mailto $emailto -s '$subj' > /dev/null");
4558: exit 1;
4559: }
4560:
4561: # --------------------------------------------- Check if other instance running
4562:
4563: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
4564:
4565: if (-e $pidfile) {
4566: my $lfh=IO::File->new("$pidfile");
4567: my $pide=<$lfh>;
4568: chomp($pide);
4569: if (kill 0 => $pide) { die "already running"; }
4570: }
4571:
4572: # ------------------------------------------------------------- Read hosts file
4573:
4574:
4575:
4576: # establish SERVER socket, bind and listen.
4577: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
4578: Type => SOCK_STREAM,
4579: Proto => 'tcp',
4580: Reuse => 1,
4581: Listen => 10 )
4582: or die "making socket: $@\n";
4583:
4584: # --------------------------------------------------------- Do global variables
4585:
4586: # global variables
4587:
4588: my %children = (); # keys are current child process IDs
4589:
4590: sub REAPER { # takes care of dead children
4591: $SIG{CHLD} = \&REAPER;
4592: &status("Handling child death");
4593: my $pid;
4594: do {
4595: $pid = waitpid(-1,&WNOHANG());
4596: if (defined($children{$pid})) {
4597: &logthis("Child $pid died");
4598: delete($children{$pid});
4599: } elsif ($pid > 0) {
4600: &logthis("Unknown Child $pid died");
4601: }
4602: } while ( $pid > 0 );
4603: foreach my $child (keys(%children)) {
4604: $pid = waitpid($child,&WNOHANG());
4605: if ($pid > 0) {
4606: &logthis("Child $child - $pid looks like we missed it's death");
4607: delete($children{$pid});
4608: }
4609: }
4610: &status("Finished Handling child death");
4611: }
4612:
4613: sub HUNTSMAN { # signal handler for SIGINT
4614: &status("Killing children (INT)");
4615: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
4616: kill 'INT' => keys %children;
4617: &logthis("Free socket: ".shutdown($server,2)); # free up socket
4618: my $execdir=$perlvar{'lonDaemons'};
4619: unlink("$execdir/logs/lond.pid");
4620: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
4621: &status("Done killing children");
4622: exit; # clean up with dignity
4623: }
4624:
4625: sub HUPSMAN { # signal handler for SIGHUP
4626: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
4627: &status("Killing children for restart (HUP)");
4628: kill 'INT' => keys %children;
4629: &logthis("Free socket: ".shutdown($server,2)); # free up socket
4630: &logthis("<font color='red'>CRITICAL: Restarting</font>");
4631: my $execdir=$perlvar{'lonDaemons'};
4632: unlink("$execdir/logs/lond.pid");
4633: &status("Restarting self (HUP)");
4634: exec("$execdir/lond"); # here we go again
4635: }
4636:
4637: #
4638: # Kill off hashes that describe the host table prior to re-reading it.
4639: # Hashes affected are:
4640: # %hostid, %hostdom %hostip %hostdns.
4641: #
4642: sub KillHostHashes {
4643: foreach my $key (keys %hostid) {
4644: delete $hostid{$key};
4645: }
4646: foreach my $key (keys %hostdom) {
4647: delete $hostdom{$key};
4648: }
4649: foreach my $key (keys %hostip) {
4650: delete $hostip{$key};
4651: }
4652: foreach my $key (keys %hostdns) {
4653: delete $hostdns{$key};
4654: }
4655: }
4656: #
4657: # Read in the host table from file and distribute it into the various hashes:
4658: #
4659: # - %hostid - Indexed by IP, the loncapa hostname.
4660: # - %hostdom - Indexed by loncapa hostname, the domain.
4661: # - %hostip - Indexed by hostid, the Ip address of the host.
4662: sub ReadHostTable {
4663:
4664: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
4665: my $myloncapaname = $perlvar{'lonHostID'};
4666: Debug("My loncapa name is : $myloncapaname");
4667: my %name_to_ip;
4668: while (my $configline=<CONFIG>) {
4669: if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {
4670: my ($id,$domain,$role,$name)=split(/:/,$configline);
4671: $name=~s/\s//g;
4672: my $ip;
4673: if (!exists($name_to_ip{$name})) {
4674: $ip = gethostbyname($name);
4675: if (!$ip || length($ip) ne 4) {
4676: &logthis("Skipping host $id name $name no IP found\n");
4677: next;
4678: }
4679: $ip=inet_ntoa($ip);
4680: $name_to_ip{$name} = $ip;
4681: } else {
4682: $ip = $name_to_ip{$name};
4683: }
4684: $hostid{$ip}=$id; # LonCAPA name of host by IP.
4685: $hostdom{$id}=$domain; # LonCAPA domain name of host.
4686: $hostip{$id}=$ip; # IP address of host.
4687: $hostdns{$name} = $id; # LonCAPA name of host by DNS.
4688:
4689: if ($id eq $perlvar{'lonHostID'}) {
4690: Debug("Found me in the host table: $name");
4691: $thisserver=$name;
4692: }
4693: }
4694: }
4695: close(CONFIG);
4696: }
4697: #
4698: # Reload the Apache daemon's state.
4699: # This is done by invoking /home/httpd/perl/apachereload
4700: # a setuid perl script that can be root for us to do this job.
4701: #
4702: sub ReloadApache {
4703: my $execdir = $perlvar{'lonDaemons'};
4704: my $script = $execdir."/apachereload";
4705: system($script);
4706: }
4707:
4708: #
4709: # Called in response to a USR2 signal.
4710: # - Reread hosts.tab
4711: # - All children connected to hosts that were removed from hosts.tab
4712: # are killed via SIGINT
4713: # - All children connected to previously existing hosts are sent SIGUSR1
4714: # - Our internal hosts hash is updated to reflect the new contents of
4715: # hosts.tab causing connections from hosts added to hosts.tab to
4716: # now be honored.
4717: #
4718: sub UpdateHosts {
4719: &status("Reload hosts.tab");
4720: logthis('<font color="blue"> Updating connections </font>');
4721: #
4722: # The %children hash has the set of IP's we currently have children
4723: # on. These need to be matched against records in the hosts.tab
4724: # Any ip's no longer in the table get killed off they correspond to
4725: # either dropped or changed hosts. Note that the re-read of the table
4726: # will take care of new and changed hosts as connections come into being.
4727:
4728:
4729: KillHostHashes;
4730: ReadHostTable;
4731:
4732: foreach my $child (keys %children) {
4733: my $childip = $children{$child};
4734: if(!$hostid{$childip}) {
4735: logthis('<font color="blue"> UpdateHosts killing child '
4736: ." $child for ip $childip </font>");
4737: kill('INT', $child);
4738: } else {
4739: logthis('<font color="green"> keeping child for ip '
4740: ." $childip (pid=$child) </font>");
4741: }
4742: }
4743: ReloadApache;
4744: &status("Finished reloading hosts.tab");
4745: }
4746:
4747:
4748: sub checkchildren {
4749: &status("Checking on the children (sending signals)");
4750: &initnewstatus();
4751: &logstatus();
4752: &logthis('Going to check on the children');
4753: my $docdir=$perlvar{'lonDocRoot'};
4754: foreach (sort keys %children) {
4755: #sleep 1;
4756: unless (kill 'USR1' => $_) {
4757: &logthis ('Child '.$_.' is dead');
4758: &logstatus($$.' is dead');
4759: delete($children{$_});
4760: }
4761: }
4762: sleep 5;
4763: $SIG{ALRM} = sub { Debug("timeout");
4764: die "timeout"; };
4765: $SIG{__DIE__} = 'DEFAULT';
4766: &status("Checking on the children (waiting for reports)");
4767: foreach (sort keys %children) {
4768: unless (-e "$docdir/lon-status/londchld/$_.txt") {
4769: eval {
4770: alarm(300);
4771: &logthis('Child '.$_.' did not respond');
4772: kill 9 => $_;
4773: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
4774: #$subj="LON: $currenthostid killed lond process $_";
4775: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
4776: #$execdir=$perlvar{'lonDaemons'};
4777: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
4778: delete($children{$_});
4779: alarm(0);
4780: }
4781: }
4782: }
4783: $SIG{ALRM} = 'DEFAULT';
4784: $SIG{__DIE__} = \&catchexception;
4785: &status("Finished checking children");
4786: &logthis('Finished Checking children');
4787: }
4788:
4789: # --------------------------------------------------------------------- Logging
4790:
4791: sub logthis {
4792: my $message=shift;
4793: my $execdir=$perlvar{'lonDaemons'};
4794: my $fh=IO::File->new(">>$execdir/logs/lond.log");
4795: my $now=time;
4796: my $local=localtime($now);
4797: $lastlog=$local.': '.$message;
4798: print $fh "$local ($$): $message\n";
4799: }
4800:
4801: # ------------------------- Conditional log if $DEBUG true.
4802: sub Debug {
4803: my $message = shift;
4804: if($DEBUG) {
4805: &logthis($message);
4806: }
4807: }
4808:
4809: #
4810: # Sub to do replies to client.. this gives a hook for some
4811: # debug tracing too:
4812: # Parameters:
4813: # fd - File open on client.
4814: # reply - Text to send to client.
4815: # request - Original request from client.
4816: #
4817: sub Reply {
4818: my ($fd, $reply, $request) = @_;
4819: print $fd $reply;
4820: Debug("Request was $request Reply was $reply");
4821:
4822: $Transactions++;
4823: }
4824:
4825:
4826: #
4827: # Sub to report a failure.
4828: # This function:
4829: # - Increments the failure statistic counters.
4830: # - Invokes Reply to send the error message to the client.
4831: # Parameters:
4832: # fd - File descriptor open on the client
4833: # reply - Reply text to emit.
4834: # request - The original request message (used by Reply
4835: # to debug if that's enabled.
4836: # Implicit outputs:
4837: # $Failures- The number of failures is incremented.
4838: # Reply (invoked here) sends a message to the
4839: # client:
4840: #
4841: sub Failure {
4842: my $fd = shift;
4843: my $reply = shift;
4844: my $request = shift;
4845:
4846: $Failures++;
4847: Reply($fd, $reply, $request); # That's simple eh?
4848: }
4849: # ------------------------------------------------------------------ Log status
4850:
4851: sub logstatus {
4852: &status("Doing logging");
4853: my $docdir=$perlvar{'lonDocRoot'};
4854: {
4855: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
4856: print $fh $status."\n".$lastlog."\n".time."\n$keymode";
4857: $fh->close();
4858: }
4859: &status("Finished $$.txt");
4860: {
4861: open(LOG,">>$docdir/lon-status/londstatus.txt");
4862: flock(LOG,LOCK_EX);
4863: print LOG $$."\t".$clientname."\t".$currenthostid."\t"
4864: .$status."\t".$lastlog."\t $keymode\n";
4865: flock(LOG,LOCK_UN);
4866: close(LOG);
4867: }
4868: &status("Finished logging");
4869: }
4870:
4871: sub initnewstatus {
4872: my $docdir=$perlvar{'lonDocRoot'};
4873: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
4874: my $now=time;
4875: my $local=localtime($now);
4876: print $fh "LOND status $local - parent $$\n\n";
4877: opendir(DIR,"$docdir/lon-status/londchld");
4878: while (my $filename=readdir(DIR)) {
4879: unlink("$docdir/lon-status/londchld/$filename");
4880: }
4881: closedir(DIR);
4882: }
4883:
4884: # -------------------------------------------------------------- Status setting
4885:
4886: sub status {
4887: my $what=shift;
4888: my $now=time;
4889: my $local=localtime($now);
4890: $status=$local.': '.$what;
4891: $0='lond: '.$what.' '.$local;
4892: }
4893:
4894: # -------------------------------------------------------- Escape Special Chars
4895:
4896: sub escape {
4897: my $str=shift;
4898: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
4899: return $str;
4900: }
4901:
4902: # ----------------------------------------------------- Un-Escape Special Chars
4903:
4904: sub unescape {
4905: my $str=shift;
4906: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
4907: return $str;
4908: }
4909:
4910: # ----------------------------------------------------------- Send USR1 to lonc
4911:
4912: sub reconlonc {
4913: my $peerfile=shift;
4914: &logthis("Trying to reconnect for $peerfile");
4915: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
4916: if (my $fh=IO::File->new("$loncfile")) {
4917: my $loncpid=<$fh>;
4918: chomp($loncpid);
4919: if (kill 0 => $loncpid) {
4920: &logthis("lonc at pid $loncpid responding, sending USR1");
4921: kill USR1 => $loncpid;
4922: } else {
4923: &logthis(
4924: "<font color='red'>CRITICAL: "
4925: ."lonc at pid $loncpid not responding, giving up</font>");
4926: }
4927: } else {
4928: &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
4929: }
4930: }
4931:
4932: # -------------------------------------------------- Non-critical communication
4933:
4934: sub subreply {
4935: my ($cmd,$server)=@_;
4936: my $peerfile="$perlvar{'lonSockDir'}/$server";
4937: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
4938: Type => SOCK_STREAM,
4939: Timeout => 10)
4940: or return "con_lost";
4941: print $sclient "$cmd\n";
4942: my $answer=<$sclient>;
4943: chomp($answer);
4944: if (!$answer) { $answer="con_lost"; }
4945: return $answer;
4946: }
4947:
4948: sub reply {
4949: my ($cmd,$server)=@_;
4950: my $answer;
4951: if ($server ne $currenthostid) {
4952: $answer=subreply($cmd,$server);
4953: if ($answer eq 'con_lost') {
4954: $answer=subreply("ping",$server);
4955: if ($answer ne $server) {
4956: &logthis("sub reply: answer != server answer is $answer, server is $server");
4957: &reconlonc("$perlvar{'lonSockDir'}/$server");
4958: }
4959: $answer=subreply($cmd,$server);
4960: }
4961: } else {
4962: $answer='self_reply';
4963: }
4964: return $answer;
4965: }
4966:
4967: # -------------------------------------------------------------- Talk to lonsql
4968:
4969: sub sql_reply {
4970: my ($cmd)=@_;
4971: my $answer=&sub_sql_reply($cmd);
4972: if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
4973: return $answer;
4974: }
4975:
4976: sub sub_sql_reply {
4977: my ($cmd)=@_;
4978: my $unixsock="mysqlsock";
4979: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
4980: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
4981: Type => SOCK_STREAM,
4982: Timeout => 10)
4983: or return "con_lost";
4984: print $sclient "$cmd\n";
4985: my $answer=<$sclient>;
4986: chomp($answer);
4987: if (!$answer) { $answer="con_lost"; }
4988: return $answer;
4989: }
4990:
4991: # -------------------------------------------- Return path to profile directory
4992:
4993: sub propath {
4994: my ($udom,$uname)=@_;
4995: $udom=~s/\W//g;
4996: $uname=~s/\W//g;
4997: my $subdir=$uname.'__';
4998: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
4999: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
5000: return $proname;
5001: }
5002:
5003: # --------------------------------------- Is this the home server of an author?
5004:
5005: sub ishome {
5006: my $author=shift;
5007: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
5008: my ($udom,$uname)=split(/\//,$author);
5009: my $proname=propath($udom,$uname);
5010: if (-e $proname) {
5011: return 'owner';
5012: } else {
5013: return 'not_owner';
5014: }
5015: }
5016:
5017: # ======================================================= Continue main program
5018: # ---------------------------------------------------- Fork once and dissociate
5019:
5020: my $fpid=fork;
5021: exit if $fpid;
5022: die "Couldn't fork: $!" unless defined ($fpid);
5023:
5024: POSIX::setsid() or die "Can't start new session: $!";
5025:
5026: # ------------------------------------------------------- Write our PID on disk
5027:
5028: my $execdir=$perlvar{'lonDaemons'};
5029: open (PIDSAVE,">$execdir/logs/lond.pid");
5030: print PIDSAVE "$$\n";
5031: close(PIDSAVE);
5032: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
5033: &status('Starting');
5034:
5035:
5036:
5037: # ----------------------------------------------------- Install signal handlers
5038:
5039:
5040: $SIG{CHLD} = \&REAPER;
5041: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
5042: $SIG{HUP} = \&HUPSMAN;
5043: $SIG{USR1} = \&checkchildren;
5044: $SIG{USR2} = \&UpdateHosts;
5045:
5046: # Read the host hashes:
5047:
5048: ReadHostTable;
5049:
5050: my $dist=`$perlvar{'lonDaemons'}/distprobe`;
5051:
5052: # --------------------------------------------------------------
5053: # Accept connections. When a connection comes in, it is validated
5054: # and if good, a child process is created to process transactions
5055: # along the connection.
5056:
5057: while (1) {
5058: &status('Starting accept');
5059: $client = $server->accept() or next;
5060: &status('Accepted '.$client.' off to spawn');
5061: make_new_child($client);
5062: &status('Finished spawning');
5063: }
5064:
5065: sub make_new_child {
5066: my $pid;
5067: # my $cipher; # Now global
5068: my $sigset;
5069:
5070: $client = shift;
5071: &status('Starting new child '.$client);
5072: &logthis('<font color="green"> Attempting to start child ('.$client.
5073: ")</font>");
5074: # block signal for fork
5075: $sigset = POSIX::SigSet->new(SIGINT);
5076: sigprocmask(SIG_BLOCK, $sigset)
5077: or die "Can't block SIGINT for fork: $!\n";
5078:
5079: die "fork: $!" unless defined ($pid = fork);
5080:
5081: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
5082: # connection liveness.
5083:
5084: #
5085: # Figure out who we're talking to so we can record the peer in
5086: # the pid hash.
5087: #
5088: my $caller = getpeername($client);
5089: my ($port,$iaddr);
5090: if (defined($caller) && length($caller) > 0) {
5091: ($port,$iaddr)=unpack_sockaddr_in($caller);
5092: } else {
5093: &logthis("Unable to determine who caller was, getpeername returned nothing");
5094: }
5095: if (defined($iaddr)) {
5096: $clientip = inet_ntoa($iaddr);
5097: Debug("Connected with $clientip");
5098: } else {
5099: &logthis("Unable to determine clientip");
5100: $clientip='Unavailable';
5101: }
5102:
5103: if ($pid) {
5104: # Parent records the child's birth and returns.
5105: sigprocmask(SIG_UNBLOCK, $sigset)
5106: or die "Can't unblock SIGINT for fork: $!\n";
5107: $children{$pid} = $clientip;
5108: &status('Started child '.$pid);
5109: return;
5110: } else {
5111: # Child can *not* return from this subroutine.
5112: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
5113: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
5114: #don't get intercepted
5115: $SIG{USR1}= \&logstatus;
5116: $SIG{ALRM}= \&timeout;
5117: $lastlog='Forked ';
5118: $status='Forked';
5119:
5120: # unblock signals
5121: sigprocmask(SIG_UNBLOCK, $sigset)
5122: or die "Can't unblock SIGINT for fork: $!\n";
5123:
5124: # my $tmpsnum=0; # Now global
5125: #---------------------------------------------------- kerberos 5 initialization
5126: &Authen::Krb5::init_context();
5127: unless (($dist eq 'fedora4') || ($dist eq 'suse9.3')) {
5128: &Authen::Krb5::init_ets();
5129: }
5130:
5131: &status('Accepted connection');
5132: # =============================================================================
5133: # do something with the connection
5134: # -----------------------------------------------------------------------------
5135: # see if we know client and 'check' for spoof IP by ineffective challenge
5136:
5137: ReadManagerTable; # May also be a manager!!
5138:
5139: my $outsideip=$clientip;
5140: if ($clientip eq '127.0.0.1') {
5141: $outsideip=$hostip{$perlvar{'lonHostID'}};
5142: }
5143:
5144: my $clientrec=($hostid{$outsideip} ne undef);
5145: my $ismanager=($managers{$outsideip} ne undef);
5146: $clientname = "[unknonwn]";
5147: if($clientrec) { # Establish client type.
5148: $ConnectionType = "client";
5149: $clientname = $hostid{$outsideip};
5150: if($ismanager) {
5151: $ConnectionType = "both";
5152: }
5153: } else {
5154: $ConnectionType = "manager";
5155: $clientname = $managers{$outsideip};
5156: }
5157: my $clientok;
5158:
5159: if ($clientrec || $ismanager) {
5160: &status("Waiting for init from $clientip $clientname");
5161: &logthis('<font color="yellow">INFO: Connection, '.
5162: $clientip.
5163: " ($clientname) connection type = $ConnectionType </font>" );
5164: &status("Connecting $clientip ($clientname))");
5165: my $remotereq=<$client>;
5166: chomp($remotereq);
5167: Debug("Got init: $remotereq");
5168: my $inikeyword = split(/:/, $remotereq);
5169: if ($remotereq =~ /^init/) {
5170: &sethost("sethost:$perlvar{'lonHostID'}");
5171: #
5172: # If the remote is attempting a local init... give that a try:
5173: #
5174: my ($i, $inittype) = split(/:/, $remotereq);
5175:
5176: # If the connection type is ssl, but I didn't get my
5177: # certificate files yet, then I'll drop back to
5178: # insecure (if allowed).
5179:
5180: if($inittype eq "ssl") {
5181: my ($ca, $cert) = lonssl::CertificateFile;
5182: my $kfile = lonssl::KeyFile;
5183: if((!$ca) ||
5184: (!$cert) ||
5185: (!$kfile)) {
5186: $inittype = ""; # This forces insecure attempt.
5187: &logthis("<font color=\"blue\"> Certificates not "
5188: ."installed -- trying insecure auth</font>");
5189: } else { # SSL certificates are in place so
5190: } # Leave the inittype alone.
5191: }
5192:
5193: if($inittype eq "local") {
5194: my $key = LocalConnection($client, $remotereq);
5195: if($key) {
5196: Debug("Got local key $key");
5197: $clientok = 1;
5198: my $cipherkey = pack("H32", $key);
5199: $cipher = new IDEA($cipherkey);
5200: print $client "ok:local\n";
5201: &logthis('<font color="green"'
5202: . "Successful local authentication </font>");
5203: $keymode = "local"
5204: } else {
5205: Debug("Failed to get local key");
5206: $clientok = 0;
5207: shutdown($client, 3);
5208: close $client;
5209: }
5210: } elsif ($inittype eq "ssl") {
5211: my $key = SSLConnection($client);
5212: if ($key) {
5213: $clientok = 1;
5214: my $cipherkey = pack("H32", $key);
5215: $cipher = new IDEA($cipherkey);
5216: &logthis('<font color="green">'
5217: ."Successfull ssl authentication with $clientname </font>");
5218: $keymode = "ssl";
5219:
5220: } else {
5221: $clientok = 0;
5222: close $client;
5223: }
5224:
5225: } else {
5226: my $ok = InsecureConnection($client);
5227: if($ok) {
5228: $clientok = 1;
5229: &logthis('<font color="green">'
5230: ."Successful insecure authentication with $clientname </font>");
5231: print $client "ok\n";
5232: $keymode = "insecure";
5233: } else {
5234: &logthis('<font color="yellow">'
5235: ."Attempted insecure connection disallowed </font>");
5236: close $client;
5237: $clientok = 0;
5238:
5239: }
5240: }
5241: } else {
5242: &logthis(
5243: "<font color='blue'>WARNING: "
5244: ."$clientip failed to initialize: >$remotereq< </font>");
5245: &status('No init '.$clientip);
5246: }
5247:
5248: } else {
5249: &logthis(
5250: "<font color='blue'>WARNING: Unknown client $clientip</font>");
5251: &status('Hung up on '.$clientip);
5252: }
5253:
5254: if ($clientok) {
5255: # ---------------- New known client connecting, could mean machine online again
5256:
5257: foreach my $id (keys(%hostip)) {
5258: if ($hostip{$id} ne $clientip ||
5259: $hostip{$currenthostid} eq $clientip) {
5260: # no need to try to do recon's to myself
5261: next;
5262: }
5263: &reconlonc("$perlvar{'lonSockDir'}/$id");
5264: }
5265: &logthis("<font color='green'>Established connection: $clientname</font>");
5266: &status('Will listen to '.$clientname);
5267: # ------------------------------------------------------------ Process requests
5268: my $keep_going = 1;
5269: my $user_input;
5270: while(($user_input = get_request) && $keep_going) {
5271: alarm(120);
5272: Debug("Main: Got $user_input\n");
5273: $keep_going = &process_request($user_input);
5274: alarm(0);
5275: &status('Listening to '.$clientname." ($keymode)");
5276: }
5277:
5278: # --------------------------------------------- client unknown or fishy, refuse
5279: } else {
5280: print $client "refused\n";
5281: $client->close();
5282: &logthis("<font color='blue'>WARNING: "
5283: ."Rejected client $clientip, closing connection</font>");
5284: }
5285: }
5286:
5287: # =============================================================================
5288:
5289: &logthis("<font color='red'>CRITICAL: "
5290: ."Disconnect from $clientip ($clientname)</font>");
5291:
5292:
5293: # this exit is VERY important, otherwise the child will become
5294: # a producer of more and more children, forking yourself into
5295: # process death.
5296: exit;
5297:
5298: }
5299: #
5300: # Determine if a user is an author for the indicated domain.
5301: #
5302: # Parameters:
5303: # domain - domain to check in .
5304: # user - Name of user to check.
5305: #
5306: # Return:
5307: # 1 - User is an author for domain.
5308: # 0 - User is not an author for domain.
5309: sub is_author {
5310: my ($domain, $user) = @_;
5311:
5312: &Debug("is_author: $user @ $domain");
5313:
5314: my $hashref = &tie_user_hash($domain, $user, "roles",
5315: &GDBM_READER());
5316:
5317: # Author role should show up as a key /domain/_au
5318:
5319: my $key = "/$domain/_au";
5320: my $value = $hashref->{$key};
5321:
5322: if(defined($value)) {
5323: &Debug("$user @ $domain is an author");
5324: }
5325:
5326: return defined($value);
5327: }
5328: #
5329: # Checks to see if the input roleput request was to set
5330: # an author role. If so, invokes the lchtmldir script to set
5331: # up a correct public_html
5332: # Parameters:
5333: # request - The request sent to the rolesput subchunk.
5334: # We're looking for /domain/_au
5335: # domain - The domain in which the user is having roles doctored.
5336: # user - Name of the user for which the role is being put.
5337: # authtype - The authentication type associated with the user.
5338: #
5339: sub manage_permissions {
5340: my ($request, $domain, $user, $authtype) = @_;
5341:
5342: &Debug("manage_permissions: $request $domain $user $authtype");
5343:
5344: # See if the request is of the form /$domain/_au
5345: if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
5346: my $execdir = $perlvar{'lonDaemons'};
5347: my $userhome= "/home/$user" ;
5348: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
5349: &Debug("Setting homedir permissions for $userhome");
5350: system("$execdir/lchtmldir $userhome $user $authtype");
5351: }
5352: }
5353:
5354:
5355: #
5356: # Return the full path of a user password file, whether it exists or not.
5357: # Parameters:
5358: # domain - Domain in which the password file lives.
5359: # user - name of the user.
5360: # Returns:
5361: # Full passwd path:
5362: #
5363: sub password_path {
5364: my ($domain, $user) = @_;
5365: return &propath($domain, $user).'/passwd';
5366: }
5367:
5368: # Password Filename
5369: # Returns the path to a passwd file given domain and user... only if
5370: # it exists.
5371: # Parameters:
5372: # domain - Domain in which to search.
5373: # user - username.
5374: # Returns:
5375: # - If the password file exists returns its path.
5376: # - If the password file does not exist, returns undefined.
5377: #
5378: sub password_filename {
5379: my ($domain, $user) = @_;
5380:
5381: Debug ("PasswordFilename called: dom = $domain user = $user");
5382:
5383: my $path = &password_path($domain, $user);
5384: Debug("PasswordFilename got path: $path");
5385: if(-e $path) {
5386: return $path;
5387: } else {
5388: return undef;
5389: }
5390: }
5391:
5392: #
5393: # Rewrite the contents of the user's passwd file.
5394: # Parameters:
5395: # domain - domain of the user.
5396: # name - User's name.
5397: # contents - New contents of the file.
5398: # Returns:
5399: # 0 - Failed.
5400: # 1 - Success.
5401: #
5402: sub rewrite_password_file {
5403: my ($domain, $user, $contents) = @_;
5404:
5405: my $file = &password_filename($domain, $user);
5406: if (defined $file) {
5407: my $pf = IO::File->new(">$file");
5408: if($pf) {
5409: print $pf "$contents\n";
5410: return 1;
5411: } else {
5412: return 0;
5413: }
5414: } else {
5415: return 0;
5416: }
5417:
5418: }
5419:
5420: #
5421: # get_auth_type - Determines the authorization type of a user in a domain.
5422:
5423: # Returns the authorization type or nouser if there is no such user.
5424: #
5425: sub get_auth_type
5426: {
5427:
5428: my ($domain, $user) = @_;
5429:
5430: Debug("get_auth_type( $domain, $user ) \n");
5431: my $proname = &propath($domain, $user);
5432: my $passwdfile = "$proname/passwd";
5433: if( -e $passwdfile ) {
5434: my $pf = IO::File->new($passwdfile);
5435: my $realpassword = <$pf>;
5436: chomp($realpassword);
5437: Debug("Password info = $realpassword\n");
5438: my ($authtype, $contentpwd) = split(/:/, $realpassword);
5439: Debug("Authtype = $authtype, content = $contentpwd\n");
5440: return "$authtype:$contentpwd";
5441: } else {
5442: Debug("Returning nouser");
5443: return "nouser";
5444: }
5445: }
5446:
5447: #
5448: # Validate a user given their domain, name and password. This utility
5449: # function is used by both AuthenticateHandler and ChangePasswordHandler
5450: # to validate the login credentials of a user.
5451: # Parameters:
5452: # $domain - The domain being logged into (this is required due to
5453: # the capability for multihomed systems.
5454: # $user - The name of the user being validated.
5455: # $password - The user's propoposed password.
5456: #
5457: # Returns:
5458: # 1 - The domain,user,pasword triplet corresponds to a valid
5459: # user.
5460: # 0 - The domain,user,password triplet is not a valid user.
5461: #
5462: sub validate_user {
5463: my ($domain, $user, $password) = @_;
5464:
5465:
5466: # Why negative ~pi you may well ask? Well this function is about
5467: # authentication, and therefore very important to get right.
5468: # I've initialized the flag that determines whether or not I've
5469: # validated correctly to a value it's not supposed to get.
5470: # At the end of this function. I'll ensure that it's not still that
5471: # value so we don't just wind up returning some accidental value
5472: # as a result of executing an unforseen code path that
5473: # did not set $validated. At the end of valid execution paths,
5474: # validated shoule be 1 for success or 0 for failuer.
5475:
5476: my $validated = -3.14159;
5477:
5478: # How we authenticate is determined by the type of authentication
5479: # the user has been assigned. If the authentication type is
5480: # "nouser", the user does not exist so we will return 0.
5481:
5482: my $contents = &get_auth_type($domain, $user);
5483: my ($howpwd, $contentpwd) = split(/:/, $contents);
5484:
5485: my $null = pack("C",0); # Used by kerberos auth types.
5486:
5487: if ($howpwd ne 'nouser') {
5488:
5489: if($howpwd eq "internal") { # Encrypted is in local password file.
5490: $validated = (crypt($password, $contentpwd) eq $contentpwd);
5491: }
5492: elsif ($howpwd eq "unix") { # User is a normal unix user.
5493: $contentpwd = (getpwnam($user))[1];
5494: if($contentpwd) {
5495: if($contentpwd eq 'x') { # Shadow password file...
5496: my $pwauth_path = "/usr/local/sbin/pwauth";
5497: open PWAUTH, "|$pwauth_path" or
5498: die "Cannot invoke authentication";
5499: print PWAUTH "$user\n$password\n";
5500: close PWAUTH;
5501: $validated = ! $?;
5502:
5503: } else { # Passwords in /etc/passwd.
5504: $validated = (crypt($password,
5505: $contentpwd) eq $contentpwd);
5506: }
5507: } else {
5508: $validated = 0;
5509: }
5510: }
5511: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
5512: if(! ($password =~ /$null/) ) {
5513: my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
5514: "",
5515: $contentpwd,,
5516: 'krbtgt',
5517: $contentpwd,
5518: 1,
5519: $password);
5520: if(!$k4error) {
5521: $validated = 1;
5522: } else {
5523: $validated = 0;
5524: &logthis('krb4: '.$user.', '.$contentpwd.', '.
5525: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
5526: }
5527: } else {
5528: $validated = 0; # Password has a match with null.
5529: }
5530: } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
5531: if(!($password =~ /$null/)) { # Null password not allowed.
5532: my $krbclient = &Authen::Krb5::parse_name($user.'@'
5533: .$contentpwd);
5534: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
5535: my $krbserver = &Authen::Krb5::parse_name($krbservice);
5536: my $credentials= &Authen::Krb5::cc_default();
5537: $credentials->initialize($krbclient);
5538: my $krbreturn = &Authen::Krb5::get_in_tkt_with_password($krbclient,
5539: $krbserver,
5540: $password,
5541: $credentials);
5542: $validated = ($krbreturn == 1);
5543: } else {
5544: $validated = 0;
5545: }
5546: } elsif ($howpwd eq "localauth") {
5547: # Authenticate via installation specific authentcation method:
5548: $validated = &localauth::localauth($user,
5549: $password,
5550: $contentpwd);
5551: } else { # Unrecognized auth is also bad.
5552: $validated = 0;
5553: }
5554: } else {
5555: $validated = 0;
5556: }
5557: #
5558: # $validated has the correct stat of the authentication:
5559: #
5560:
5561: unless ($validated != -3.14159) {
5562: # I >really really< want to know if this happens.
5563: # since it indicates that user authentication is badly
5564: # broken in some code path.
5565: #
5566: die "ValidateUser - failed to set the value of validated $domain, $user $password";
5567: }
5568: return $validated;
5569: }
5570:
5571:
5572: sub addline {
5573: my ($fname,$hostid,$ip,$newline)=@_;
5574: my $contents;
5575: my $found=0;
5576: my $expr='^'.$hostid.':'.$ip.':';
5577: $expr =~ s/\./\\\./g;
5578: my $sh;
5579: if ($sh=IO::File->new("$fname.subscription")) {
5580: while (my $subline=<$sh>) {
5581: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
5582: }
5583: $sh->close();
5584: }
5585: $sh=IO::File->new(">$fname.subscription");
5586: if ($contents) { print $sh $contents; }
5587: if ($newline) { print $sh $newline; }
5588: $sh->close();
5589: return $found;
5590: }
5591:
5592: sub get_chat {
5593: my ($cdom,$cname,$udom,$uname)=@_;
5594: my %hash;
5595: my $proname=&propath($cdom,$cname);
5596: my @entries=();
5597: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
5598: &GDBM_READER(),0640)) {
5599: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
5600: untie %hash;
5601: }
5602: my @participants=();
5603: my $cutoff=time-60;
5604: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
5605: &GDBM_WRCREAT(),0640)) {
5606: $hash{$uname.':'.$udom}=time;
5607: foreach (sort keys %hash) {
5608: if ($hash{$_}>$cutoff) {
5609: $participants[$#participants+1]='active_participant:'.$_;
5610: }
5611: }
5612: untie %hash;
5613: }
5614: return (@participants,@entries);
5615: }
5616:
5617: sub chat_add {
5618: my ($cdom,$cname,$newchat)=@_;
5619: my %hash;
5620: my $proname=&propath($cdom,$cname);
5621: my @entries=();
5622: my $time=time;
5623: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
5624: &GDBM_WRCREAT(),0640)) {
5625: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
5626: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
5627: my ($thentime,$idnum)=split(/\_/,$lastid);
5628: my $newid=$time.'_000000';
5629: if ($thentime==$time) {
5630: $idnum=~s/^0+//;
5631: $idnum++;
5632: $idnum=substr('000000'.$idnum,-6,6);
5633: $newid=$time.'_'.$idnum;
5634: }
5635: $hash{$newid}=$newchat;
5636: my $expired=$time-3600;
5637: foreach (keys %hash) {
5638: my ($thistime)=($_=~/(\d+)\_/);
5639: if ($thistime<$expired) {
5640: delete $hash{$_};
5641: }
5642: }
5643: untie %hash;
5644: }
5645: {
5646: my $hfh;
5647: if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
5648: print $hfh "$time:".&unescape($newchat)."\n";
5649: }
5650: }
5651: }
5652:
5653: sub unsub {
5654: my ($fname,$clientip)=@_;
5655: my $result;
5656: my $unsubs = 0; # Number of successful unsubscribes:
5657:
5658:
5659: # An old way subscriptions were handled was to have a
5660: # subscription marker file:
5661:
5662: Debug("Attempting unlink of $fname.$clientname");
5663: if (unlink("$fname.$clientname")) {
5664: $unsubs++; # Successful unsub via marker file.
5665: }
5666:
5667: # The more modern way to do it is to have a subscription list
5668: # file:
5669:
5670: if (-e "$fname.subscription") {
5671: my $found=&addline($fname,$clientname,$clientip,'');
5672: if ($found) {
5673: $unsubs++;
5674: }
5675: }
5676:
5677: # If either or both of these mechanisms succeeded in unsubscribing a
5678: # resource we can return ok:
5679:
5680: if($unsubs) {
5681: $result = "ok\n";
5682: } else {
5683: $result = "not_subscribed\n";
5684: }
5685:
5686: return $result;
5687: }
5688:
5689: sub currentversion {
5690: my $fname=shift;
5691: my $version=-1;
5692: my $ulsdir='';
5693: if ($fname=~/^(.+)\/[^\/]+$/) {
5694: $ulsdir=$1;
5695: }
5696: my ($fnamere1,$fnamere2);
5697: # remove version if already specified
5698: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
5699: # get the bits that go before and after the version number
5700: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
5701: $fnamere1=$1;
5702: $fnamere2='.'.$2;
5703: }
5704: if (-e $fname) { $version=1; }
5705: if (-e $ulsdir) {
5706: if(-d $ulsdir) {
5707: if (opendir(LSDIR,$ulsdir)) {
5708: my $ulsfn;
5709: while ($ulsfn=readdir(LSDIR)) {
5710: # see if this is a regular file (ignore links produced earlier)
5711: my $thisfile=$ulsdir.'/'.$ulsfn;
5712: unless (-l $thisfile) {
5713: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
5714: if ($1>$version) { $version=$1; }
5715: }
5716: }
5717: }
5718: closedir(LSDIR);
5719: $version++;
5720: }
5721: }
5722: }
5723: return $version;
5724: }
5725:
5726: sub thisversion {
5727: my $fname=shift;
5728: my $version=-1;
5729: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
5730: $version=$1;
5731: }
5732: return $version;
5733: }
5734:
5735: sub subscribe {
5736: my ($userinput,$clientip)=@_;
5737: my $result;
5738: my ($cmd,$fname)=split(/:/,$userinput,2);
5739: my $ownership=&ishome($fname);
5740: if ($ownership eq 'owner') {
5741: # explitly asking for the current version?
5742: unless (-e $fname) {
5743: my $currentversion=¤tversion($fname);
5744: if (&thisversion($fname)==$currentversion) {
5745: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
5746: my $root=$1;
5747: my $extension=$2;
5748: symlink($root.'.'.$extension,
5749: $root.'.'.$currentversion.'.'.$extension);
5750: unless ($extension=~/\.meta$/) {
5751: symlink($root.'.'.$extension.'.meta',
5752: $root.'.'.$currentversion.'.'.$extension.'.meta');
5753: }
5754: }
5755: }
5756: }
5757: if (-e $fname) {
5758: if (-d $fname) {
5759: $result="directory\n";
5760: } else {
5761: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
5762: my $now=time;
5763: my $found=&addline($fname,$clientname,$clientip,
5764: "$clientname:$clientip:$now\n");
5765: if ($found) { $result="$fname\n"; }
5766: # if they were subscribed to only meta data, delete that
5767: # subscription, when you subscribe to a file you also get
5768: # the metadata
5769: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
5770: $fname=~s/\/home\/httpd\/html\/res/raw/;
5771: $fname="http://$thisserver/".$fname;
5772: $result="$fname\n";
5773: }
5774: } else {
5775: $result="not_found\n";
5776: }
5777: } else {
5778: $result="rejected\n";
5779: }
5780: return $result;
5781: }
5782: # Change the passwd of a unix user. The caller must have
5783: # first verified that the user is a loncapa user.
5784: #
5785: # Parameters:
5786: # user - Unix user name to change.
5787: # pass - New password for the user.
5788: # Returns:
5789: # ok - if success
5790: # other - Some meaningfule error message string.
5791: # NOTE:
5792: # invokes a setuid script to change the passwd.
5793: sub change_unix_password {
5794: my ($user, $pass) = @_;
5795:
5796: &Debug("change_unix_password");
5797: my $execdir=$perlvar{'lonDaemons'};
5798: &Debug("Opening lcpasswd pipeline");
5799: my $pf = IO::File->new("|$execdir/lcpasswd > "
5800: ."$perlvar{'lonDaemons'}"
5801: ."/logs/lcpasswd.log");
5802: print $pf "$user\n$pass\n$pass\n";
5803: close $pf;
5804: my $err = $?;
5805: return ($err < @passwderrors) ? $passwderrors[$err] :
5806: "pwchange_falure - unknown error";
5807:
5808:
5809: }
5810:
5811:
5812: sub make_passwd_file {
5813: my ($uname, $umode,$npass,$passfilename)=@_;
5814: my $result="ok\n";
5815: if ($umode eq 'krb4' or $umode eq 'krb5') {
5816: {
5817: my $pf = IO::File->new(">$passfilename");
5818: if ($pf) {
5819: print $pf "$umode:$npass\n";
5820: } else {
5821: $result = "pass_file_failed_error";
5822: }
5823: }
5824: } elsif ($umode eq 'internal') {
5825: my $salt=time;
5826: $salt=substr($salt,6,2);
5827: my $ncpass=crypt($npass,$salt);
5828: {
5829: &Debug("Creating internal auth");
5830: my $pf = IO::File->new(">$passfilename");
5831: if($pf) {
5832: print $pf "internal:$ncpass\n";
5833: } else {
5834: $result = "pass_file_failed_error";
5835: }
5836: }
5837: } elsif ($umode eq 'localauth') {
5838: {
5839: my $pf = IO::File->new(">$passfilename");
5840: if($pf) {
5841: print $pf "localauth:$npass\n";
5842: } else {
5843: $result = "pass_file_failed_error";
5844: }
5845: }
5846: } elsif ($umode eq 'unix') {
5847: {
5848: #
5849: # Don't allow the creation of privileged accounts!!! that would
5850: # be real bad!!!
5851: #
5852: my $uid = getpwnam($uname);
5853: if((defined $uid) && ($uid == 0)) {
5854: &logthis(">>>Attempted to create privilged account blocked");
5855: return "no_priv_account_error\n";
5856: }
5857:
5858: my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd";
5859:
5860: my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status";
5861: {
5862: &Debug("Executing external: ".$execpath);
5863: &Debug("user = ".$uname.", Password =". $npass);
5864: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
5865: print $se "$uname\n";
5866: print $se "$npass\n";
5867: print $se "$npass\n";
5868: print $se "$lc_error_file\n"; # Status -> unique file.
5869: }
5870: if (-r $lc_error_file) {
5871: &Debug("Opening error file: $lc_error_file");
5872: my $error = IO::File->new("< $lc_error_file");
5873: my $useraddok = <$error>;
5874: $error->close;
5875: unlink($lc_error_file);
5876:
5877: chomp $useraddok;
5878:
5879: if($useraddok > 0) {
5880: my $error_text = &lcuseraddstrerror($useraddok);
5881: &logthis("Failed lcuseradd: $error_text");
5882: $result = "lcuseradd_failed:$error_text\n";
5883: } else {
5884: my $pf = IO::File->new(">$passfilename");
5885: if($pf) {
5886: print $pf "unix:\n";
5887: } else {
5888: $result = "pass_file_failed_error";
5889: }
5890: }
5891: } else {
5892: &Debug("Could not locate lcuseradd error: $lc_error_file");
5893: $result="bug_lcuseradd_no_output_file";
5894: }
5895: }
5896: } elsif ($umode eq 'none') {
5897: {
5898: my $pf = IO::File->new("> $passfilename");
5899: if($pf) {
5900: print $pf "none:\n";
5901: } else {
5902: $result = "pass_file_failed_error";
5903: }
5904: }
5905: } else {
5906: $result="auth_mode_error\n";
5907: }
5908: return $result;
5909: }
5910:
5911: sub convert_photo {
5912: my ($start,$dest)=@_;
5913: system("convert $start $dest");
5914: }
5915:
5916: sub sethost {
5917: my ($remotereq) = @_;
5918: my (undef,$hostid)=split(/:/,$remotereq);
5919: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
5920: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
5921: $currenthostid =$hostid;
5922: $currentdomainid=$hostdom{$hostid};
5923: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
5924: } else {
5925: &logthis("Requested host id $hostid not an alias of ".
5926: $perlvar{'lonHostID'}." refusing connection");
5927: return 'unable_to_set';
5928: }
5929: return 'ok';
5930: }
5931:
5932: sub version {
5933: my ($userinput)=@_;
5934: $remoteVERSION=(split(/:/,$userinput))[1];
5935: return "version:$VERSION";
5936: }
5937:
5938: #There is a copy of this in lonnet.pm
5939: sub userload {
5940: my $numusers=0;
5941: {
5942: opendir(LONIDS,$perlvar{'lonIDsDir'});
5943: my $filename;
5944: my $curtime=time;
5945: while ($filename=readdir(LONIDS)) {
5946: if ($filename eq '.' || $filename eq '..') {next;}
5947: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
5948: if ($curtime-$mtime < 1800) { $numusers++; }
5949: }
5950: closedir(LONIDS);
5951: }
5952: my $userloadpercent=0;
5953: my $maxuserload=$perlvar{'lonUserLoadLim'};
5954: if ($maxuserload) {
5955: $userloadpercent=100*$numusers/$maxuserload;
5956: }
5957: $userloadpercent=sprintf("%.2f",$userloadpercent);
5958: return $userloadpercent;
5959: }
5960:
5961: # Routines for serializing arrays and hashes (copies from lonnet)
5962:
5963: sub array2str {
5964: my (@array) = @_;
5965: my $result=&arrayref2str(\@array);
5966: $result=~s/^__ARRAY_REF__//;
5967: $result=~s/__END_ARRAY_REF__$//;
5968: return $result;
5969: }
5970:
5971: sub arrayref2str {
5972: my ($arrayref) = @_;
5973: my $result='__ARRAY_REF__';
5974: foreach my $elem (@$arrayref) {
5975: if(ref($elem) eq 'ARRAY') {
5976: $result.=&arrayref2str($elem).'&';
5977: } elsif(ref($elem) eq 'HASH') {
5978: $result.=&hashref2str($elem).'&';
5979: } elsif(ref($elem)) {
5980: #print("Got a ref of ".(ref($elem))." skipping.");
5981: } else {
5982: $result.=&escape($elem).'&';
5983: }
5984: }
5985: $result=~s/\&$//;
5986: $result .= '__END_ARRAY_REF__';
5987: return $result;
5988: }
5989:
5990: sub hash2str {
5991: my (%hash) = @_;
5992: my $result=&hashref2str(\%hash);
5993: $result=~s/^__HASH_REF__//;
5994: $result=~s/__END_HASH_REF__$//;
5995: return $result;
5996: }
5997:
5998: sub hashref2str {
5999: my ($hashref)=@_;
6000: my $result='__HASH_REF__';
6001: foreach (sort(keys(%$hashref))) {
6002: if (ref($_) eq 'ARRAY') {
6003: $result.=&arrayref2str($_).'=';
6004: } elsif (ref($_) eq 'HASH') {
6005: $result.=&hashref2str($_).'=';
6006: } elsif (ref($_)) {
6007: $result.='=';
6008: #print("Got a ref of ".(ref($_))." skipping.");
6009: } else {
6010: if ($_) {$result.=&escape($_).'=';} else { last; }
6011: }
6012:
6013: if(ref($hashref->{$_}) eq 'ARRAY') {
6014: $result.=&arrayref2str($hashref->{$_}).'&';
6015: } elsif(ref($hashref->{$_}) eq 'HASH') {
6016: $result.=&hashref2str($hashref->{$_}).'&';
6017: } elsif(ref($hashref->{$_})) {
6018: $result.='&';
6019: #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
6020: } else {
6021: $result.=&escape($hashref->{$_}).'&';
6022: }
6023: }
6024: $result=~s/\&$//;
6025: $result .= '__END_HASH_REF__';
6026: return $result;
6027: }
6028:
6029: # ----------------------------------- POD (plain old documentation, CPAN style)
6030:
6031: =head1 NAME
6032:
6033: lond - "LON Daemon" Server (port "LOND" 5663)
6034:
6035: =head1 SYNOPSIS
6036:
6037: Usage: B<lond>
6038:
6039: Should only be run as user=www. This is a command-line script which
6040: is invoked by B<loncron>. There is no expectation that a typical user
6041: will manually start B<lond> from the command-line. (In other words,
6042: DO NOT START B<lond> YOURSELF.)
6043:
6044: =head1 DESCRIPTION
6045:
6046: There are two characteristics associated with the running of B<lond>,
6047: PROCESS MANAGEMENT (starting, stopping, handling child processes)
6048: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
6049: subscriptions, etc). These are described in two large
6050: sections below.
6051:
6052: B<PROCESS MANAGEMENT>
6053:
6054: Preforker - server who forks first. Runs as a daemon. HUPs.
6055: Uses IDEA encryption
6056:
6057: B<lond> forks off children processes that correspond to the other servers
6058: in the network. Management of these processes can be done at the
6059: parent process level or the child process level.
6060:
6061: B<logs/lond.log> is the location of log messages.
6062:
6063: The process management is now explained in terms of linux shell commands,
6064: subroutines internal to this code, and signal assignments:
6065:
6066: =over 4
6067:
6068: =item *
6069:
6070: PID is stored in B<logs/lond.pid>
6071:
6072: This is the process id number of the parent B<lond> process.
6073:
6074: =item *
6075:
6076: SIGTERM and SIGINT
6077:
6078: Parent signal assignment:
6079: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
6080:
6081: Child signal assignment:
6082: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
6083: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
6084: to restart a new child.)
6085:
6086: Command-line invocations:
6087: B<kill> B<-s> SIGTERM I<PID>
6088: B<kill> B<-s> SIGINT I<PID>
6089:
6090: Subroutine B<HUNTSMAN>:
6091: This is only invoked for the B<lond> parent I<PID>.
6092: This kills all the children, and then the parent.
6093: The B<lonc.pid> file is cleared.
6094:
6095: =item *
6096:
6097: SIGHUP
6098:
6099: Current bug:
6100: This signal can only be processed the first time
6101: on the parent process. Subsequent SIGHUP signals
6102: have no effect.
6103:
6104: Parent signal assignment:
6105: $SIG{HUP} = \&HUPSMAN;
6106:
6107: Child signal assignment:
6108: none (nothing happens)
6109:
6110: Command-line invocations:
6111: B<kill> B<-s> SIGHUP I<PID>
6112:
6113: Subroutine B<HUPSMAN>:
6114: This is only invoked for the B<lond> parent I<PID>,
6115: This kills all the children, and then the parent.
6116: The B<lond.pid> file is cleared.
6117:
6118: =item *
6119:
6120: SIGUSR1
6121:
6122: Parent signal assignment:
6123: $SIG{USR1} = \&USRMAN;
6124:
6125: Child signal assignment:
6126: $SIG{USR1}= \&logstatus;
6127:
6128: Command-line invocations:
6129: B<kill> B<-s> SIGUSR1 I<PID>
6130:
6131: Subroutine B<USRMAN>:
6132: When invoked for the B<lond> parent I<PID>,
6133: SIGUSR1 is sent to all the children, and the status of
6134: each connection is logged.
6135:
6136: =item *
6137:
6138: SIGUSR2
6139:
6140: Parent Signal assignment:
6141: $SIG{USR2} = \&UpdateHosts
6142:
6143: Child signal assignment:
6144: NONE
6145:
6146:
6147: =item *
6148:
6149: SIGCHLD
6150:
6151: Parent signal assignment:
6152: $SIG{CHLD} = \&REAPER;
6153:
6154: Child signal assignment:
6155: none
6156:
6157: Command-line invocations:
6158: B<kill> B<-s> SIGCHLD I<PID>
6159:
6160: Subroutine B<REAPER>:
6161: This is only invoked for the B<lond> parent I<PID>.
6162: Information pertaining to the child is removed.
6163: The socket port is cleaned up.
6164:
6165: =back
6166:
6167: B<SERVER-SIDE ACTIVITIES>
6168:
6169: Server-side information can be accepted in an encrypted or non-encrypted
6170: method.
6171:
6172: =over 4
6173:
6174: =item ping
6175:
6176: Query a client in the hosts.tab table; "Are you there?"
6177:
6178: =item pong
6179:
6180: Respond to a ping query.
6181:
6182: =item ekey
6183:
6184: Read in encrypted key, make cipher. Respond with a buildkey.
6185:
6186: =item load
6187:
6188: Respond with CPU load based on a computation upon /proc/loadavg.
6189:
6190: =item currentauth
6191:
6192: Reply with current authentication information (only over an
6193: encrypted channel).
6194:
6195: =item auth
6196:
6197: Only over an encrypted channel, reply as to whether a user's
6198: authentication information can be validated.
6199:
6200: =item passwd
6201:
6202: Allow for a password to be set.
6203:
6204: =item makeuser
6205:
6206: Make a user.
6207:
6208: =item passwd
6209:
6210: Allow for authentication mechanism and password to be changed.
6211:
6212: =item home
6213:
6214: Respond to a question "are you the home for a given user?"
6215:
6216: =item update
6217:
6218: Update contents of a subscribed resource.
6219:
6220: =item unsubscribe
6221:
6222: The server is unsubscribing from a resource.
6223:
6224: =item subscribe
6225:
6226: The server is subscribing to a resource.
6227:
6228: =item log
6229:
6230: Place in B<logs/lond.log>
6231:
6232: =item put
6233:
6234: stores hash in namespace
6235:
6236: =item rolesputy
6237:
6238: put a role into a user's environment
6239:
6240: =item get
6241:
6242: returns hash with keys from array
6243: reference filled in from namespace
6244:
6245: =item eget
6246:
6247: returns hash with keys from array
6248: reference filled in from namesp (encrypts the return communication)
6249:
6250: =item rolesget
6251:
6252: get a role from a user's environment
6253:
6254: =item del
6255:
6256: deletes keys out of array from namespace
6257:
6258: =item keys
6259:
6260: returns namespace keys
6261:
6262: =item dump
6263:
6264: dumps the complete (or key matching regexp) namespace into a hash
6265:
6266: =item store
6267:
6268: stores hash permanently
6269: for this url; hashref needs to be given and should be a \%hashname; the
6270: remaining args aren't required and if they aren't passed or are '' they will
6271: be derived from the ENV
6272:
6273: =item restore
6274:
6275: returns a hash for a given url
6276:
6277: =item querysend
6278:
6279: Tells client about the lonsql process that has been launched in response
6280: to a sent query.
6281:
6282: =item queryreply
6283:
6284: Accept information from lonsql and make appropriate storage in temporary
6285: file space.
6286:
6287: =item idput
6288:
6289: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
6290: for each student, defined perhaps by the institutional Registrar.)
6291:
6292: =item idget
6293:
6294: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
6295: for each student, defined perhaps by the institutional Registrar.)
6296:
6297: =item tmpput
6298:
6299: Accept and store information in temporary space.
6300:
6301: =item tmpget
6302:
6303: Send along temporarily stored information.
6304:
6305: =item ls
6306:
6307: List part of a user's directory.
6308:
6309: =item pushtable
6310:
6311: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
6312: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
6313: must be restored manually in case of a problem with the new table file.
6314: pushtable requires that the request be encrypted and validated via
6315: ValidateManager. The form of the command is:
6316: enc:pushtable tablename <tablecontents> \n
6317: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
6318: cleartext newline.
6319:
6320: =item Hanging up (exit or init)
6321:
6322: What to do when a client tells the server that they (the client)
6323: are leaving the network.
6324:
6325: =item unknown command
6326:
6327: If B<lond> is sent an unknown command (not in the list above),
6328: it replys to the client "unknown_cmd".
6329:
6330:
6331: =item UNKNOWN CLIENT
6332:
6333: If the anti-spoofing algorithm cannot verify the client,
6334: the client is rejected (with a "refused" message sent
6335: to the client, and the connection is closed.
6336:
6337: =back
6338:
6339: =head1 PREREQUISITES
6340:
6341: IO::Socket
6342: IO::File
6343: Apache::File
6344: Symbol
6345: POSIX
6346: Crypt::IDEA
6347: LWP::UserAgent()
6348: GDBM_File
6349: Authen::Krb4
6350: Authen::Krb5
6351:
6352: =head1 COREQUISITES
6353:
6354: =head1 OSNAMES
6355:
6356: linux
6357:
6358: =head1 SCRIPT CATEGORIES
6359:
6360: Server/Process
6361:
6362: =cut
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lond CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / loncom