1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.328 2006/05/18 02:32:06 albertel 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;
35: use LONCAPA::Configuration;
36:
37: use IO::Socket;
38: use IO::File;
39: #use Apache::File;
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: my $lond_max_wait_time = 13;
62:
63: my $VERSION='$Revision: 1.328 $'; #' stupid emacs
64: my $remoteVERSION;
65: my $currenthostid="default";
66: my $currentdomainid;
67:
68: my $client;
69: my $clientip; # IP address of client.
70: my $clientname; # LonCAPA name of client.
71:
72: my $server;
73: my $thisserver; # DNS of us.
74:
75: my $keymode;
76:
77: my $cipher; # Cipher key negotiated with client
78: my $tmpsnum = 0; # Id of tmpputs.
79:
80: #
81: # Connection type is:
82: # client - All client actions are allowed
83: # manager - only management functions allowed.
84: # both - Both management and client actions are allowed
85: #
86:
87: my $ConnectionType;
88:
89: my %hostid; # ID's for hosts in cluster by ip.
90: my %hostdom; # LonCAPA domain for hosts in cluster.
91: my %hostname; # DNSname -> ID's mapping.
92: my %hostip; # IPs for hosts in cluster.
93: my %hostdns; # ID's of hosts looked up by DNS name.
94:
95: my %managers; # Ip -> manager names
96:
97: my %perlvar; # Will have the apache conf defined perl vars.
98:
99: #
100: # The hash below is used for command dispatching, and is therefore keyed on the request keyword.
101: # Each element of the hash contains a reference to an array that contains:
102: # A reference to a sub that executes the request corresponding to the keyword.
103: # A flag that is true if the request must be encoded to be acceptable.
104: # A mask with bits as follows:
105: # CLIENT_OK - Set when the function is allowed by ordinary clients
106: # MANAGER_OK - Set when the function is allowed to manager clients.
107: #
108: my $CLIENT_OK = 1;
109: my $MANAGER_OK = 2;
110: my %Dispatcher;
111:
112:
113: #
114: # The array below are password error strings."
115: #
116: my $lastpwderror = 13; # Largest error number from lcpasswd.
117: my @passwderrors = ("ok",
118: "pwchange_failure - lcpasswd must be run as user 'www'",
119: "pwchange_failure - lcpasswd got incorrect number of arguments",
120: "pwchange_failure - lcpasswd did not get the right nubmer of input text lines",
121: "pwchange_failure - lcpasswd too many simultaneous pwd changes in progress",
122: "pwchange_failure - lcpasswd User does not exist.",
123: "pwchange_failure - lcpasswd Incorrect current passwd",
124: "pwchange_failure - lcpasswd Unable to su to root.",
125: "pwchange_failure - lcpasswd Cannot set new passwd.",
126: "pwchange_failure - lcpasswd Username has invalid characters",
127: "pwchange_failure - lcpasswd Invalid characters in password",
128: "pwchange_failure - lcpasswd User already exists",
129: "pwchange_failure - lcpasswd Something went wrong with user addition.",
130: "pwchange_failure - lcpasswd Password mismatch",
131: "pwchange_failure - lcpasswd Error filename is invalid");
132:
133:
134: # The array below are lcuseradd error strings.:
135:
136: my $lastadderror = 13;
137: my @adderrors = ("ok",
138: "User ID mismatch, lcuseradd must run as user www",
139: "lcuseradd Incorrect number of command line parameters must be 3",
140: "lcuseradd Incorrect number of stdinput lines, must be 3",
141: "lcuseradd Too many other simultaneous pwd changes in progress",
142: "lcuseradd User does not exist",
143: "lcuseradd Unable to make www member of users's group",
144: "lcuseradd Unable to su to root",
145: "lcuseradd Unable to set password",
146: "lcuseradd Usrname has invalid characters",
147: "lcuseradd Password has an invalid character",
148: "lcuseradd User already exists",
149: "lcuseradd Could not add user.",
150: "lcuseradd Password mismatch");
151:
152:
153:
154: #
155: # Statistics that are maintained and dislayed in the status line.
156: #
157: my $Transactions = 0; # Number of attempted transactions.
158: my $Failures = 0; # Number of transcations failed.
159:
160: # ResetStatistics:
161: # Resets the statistics counters:
162: #
163: sub ResetStatistics {
164: $Transactions = 0;
165: $Failures = 0;
166: }
167:
168: #------------------------------------------------------------------------
169: #
170: # LocalConnection
171: # Completes the formation of a locally authenticated connection.
172: # This function will ensure that the 'remote' client is really the
173: # local host. If not, the connection is closed, and the function fails.
174: # If so, initcmd is parsed for the name of a file containing the
175: # IDEA session key. The fie is opened, read, deleted and the session
176: # key returned to the caller.
177: #
178: # Parameters:
179: # $Socket - Socket open on client.
180: # $initcmd - The full text of the init command.
181: #
182: # Implicit inputs:
183: # $thisserver - Our DNS name.
184: #
185: # Returns:
186: # IDEA session key on success.
187: # undef on failure.
188: #
189: sub LocalConnection {
190: my ($Socket, $initcmd) = @_;
191: Debug("Attempting local connection: $initcmd client: $clientip me: $thisserver");
192: if($clientip ne "127.0.0.1") {
193: &logthis('<font color="red"> LocalConnection rejecting non local: '
194: ."$clientip ne $thisserver </font>");
195: close $Socket;
196: return undef;
197: } else {
198: chomp($initcmd); # Get rid of \n in filename.
199: my ($init, $type, $name) = split(/:/, $initcmd);
200: Debug(" Init command: $init $type $name ");
201:
202: # Require that $init = init, and $type = local: Otherwise
203: # the caller is insane:
204:
205: if(($init ne "init") && ($type ne "local")) {
206: &logthis('<font color = "red"> LocalConnection: caller is insane! '
207: ."init = $init, and type = $type </font>");
208: close($Socket);;
209: return undef;
210:
211: }
212: # Now get the key filename:
213:
214: my $IDEAKey = lonlocal::ReadKeyFile($name);
215: return $IDEAKey;
216: }
217: }
218: #------------------------------------------------------------------------------
219: #
220: # SSLConnection
221: # Completes the formation of an ssh authenticated connection. The
222: # socket is promoted to an ssl socket. If this promotion and the associated
223: # certificate exchange are successful, the IDEA key is generated and sent
224: # to the remote peer via the SSL tunnel. The IDEA key is also returned to
225: # the caller after the SSL tunnel is torn down.
226: #
227: # Parameters:
228: # Name Type Purpose
229: # $Socket IO::Socket::INET Plaintext socket.
230: #
231: # Returns:
232: # IDEA key on success.
233: # undef on failure.
234: #
235: sub SSLConnection {
236: my $Socket = shift;
237:
238: Debug("SSLConnection: ");
239: my $KeyFile = lonssl::KeyFile();
240: if(!$KeyFile) {
241: my $err = lonssl::LastError();
242: &logthis("<font color=\"red\"> CRITICAL"
243: ."Can't get key file $err </font>");
244: return undef;
245: }
246: my ($CACertificate,
247: $Certificate) = lonssl::CertificateFile();
248:
249:
250: # If any of the key, certificate or certificate authority
251: # certificate filenames are not defined, this can't work.
252:
253: if((!$Certificate) || (!$CACertificate)) {
254: my $err = lonssl::LastError();
255: &logthis("<font color=\"red\"> CRITICAL"
256: ."Can't get certificates: $err </font>");
257:
258: return undef;
259: }
260: Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
261:
262: # Indicate to our peer that we can procede with
263: # a transition to ssl authentication:
264:
265: print $Socket "ok:ssl\n";
266:
267: Debug("Approving promotion -> ssl");
268: # And do so:
269:
270: my $SSLSocket = lonssl::PromoteServerSocket($Socket,
271: $CACertificate,
272: $Certificate,
273: $KeyFile);
274: if(! ($SSLSocket) ) { # SSL socket promotion failed.
275: my $err = lonssl::LastError();
276: &logthis("<font color=\"red\"> CRITICAL "
277: ."SSL Socket promotion failed: $err </font>");
278: return undef;
279: }
280: Debug("SSL Promotion successful");
281:
282: #
283: # The only thing we'll use the socket for is to send the IDEA key
284: # to the peer:
285:
286: my $Key = lonlocal::CreateCipherKey();
287: print $SSLSocket "$Key\n";
288:
289: lonssl::Close($SSLSocket);
290:
291: Debug("Key exchange complete: $Key");
292:
293: return $Key;
294: }
295: #
296: # InsecureConnection:
297: # If insecure connections are allowd,
298: # exchange a challenge with the client to 'validate' the
299: # client (not really, but that's the protocol):
300: # We produce a challenge string that's sent to the client.
301: # The client must then echo the challenge verbatim to us.
302: #
303: # Parameter:
304: # Socket - Socket open on the client.
305: # Returns:
306: # 1 - success.
307: # 0 - failure (e.g.mismatch or insecure not allowed).
308: #
309: sub InsecureConnection {
310: my $Socket = shift;
311:
312: # Don't even start if insecure connections are not allowed.
313:
314: if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed.
315: return 0;
316: }
317:
318: # Fabricate a challenge string and send it..
319:
320: my $challenge = "$$".time; # pid + time.
321: print $Socket "$challenge\n";
322: &status("Waiting for challenge reply");
323:
324: my $answer = <$Socket>;
325: $answer =~s/\W//g;
326: if($challenge eq $answer) {
327: return 1;
328: } else {
329: logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
330: &status("No challenge reqply");
331: return 0;
332: }
333:
334:
335: }
336: #
337: # Safely execute a command (as long as it's not a shel command and doesn
338: # not require/rely on shell escapes. The function operates by doing a
339: # a pipe based fork and capturing stdout and stderr from the pipe.
340: #
341: # Formal Parameters:
342: # $line - A line of text to be executed as a command.
343: # Returns:
344: # The output from that command. If the output is multiline the caller
345: # must know how to split up the output.
346: #
347: #
348: sub execute_command {
349: my ($line) = @_;
350: my @words = split(/\s/, $line); # Bust the command up into words.
351: my $output = "";
352:
353: my $pid = open(CHILD, "-|");
354:
355: if($pid) { # Parent process
356: Debug("In parent process for execute_command");
357: my @data = <CHILD>; # Read the child's outupt...
358: close CHILD;
359: foreach my $output_line (@data) {
360: Debug("Adding $output_line");
361: $output .= $output_line; # Presumably has a \n on it.
362: }
363:
364: } else { # Child process
365: close (STDERR);
366: open (STDERR, ">&STDOUT");# Combine stderr, and stdout...
367: exec(@words); # won't return.
368: }
369: return $output;
370: }
371:
372:
373: # GetCertificate: Given a transaction that requires a certificate,
374: # this function will extract the certificate from the transaction
375: # request. Note that at this point, the only concept of a certificate
376: # is the hostname to which we are connected.
377: #
378: # Parameter:
379: # request - The request sent by our client (this parameterization may
380: # need to change when we really use a certificate granting
381: # authority.
382: #
383: sub GetCertificate {
384: my $request = shift;
385:
386: return $clientip;
387: }
388:
389: #
390: # Return true if client is a manager.
391: #
392: sub isManager {
393: return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
394: }
395: #
396: # Return tru if client can do client functions
397: #
398: sub isClient {
399: return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
400: }
401:
402:
403: #
404: # ReadManagerTable: Reads in the current manager table. For now this is
405: # done on each manager authentication because:
406: # - These authentications are not frequent
407: # - This allows dynamic changes to the manager table
408: # without the need to signal to the lond.
409: #
410: sub ReadManagerTable {
411:
412: # Clean out the old table first..
413:
414: foreach my $key (keys %managers) {
415: delete $managers{$key};
416: }
417:
418: my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
419: if (!open (MANAGERS, $tablename)) {
420: logthis('<font color="red">No manager table. Nobody can manage!!</font>');
421: return;
422: }
423: while(my $host = <MANAGERS>) {
424: chomp($host);
425: if ($host =~ "^#") { # Comment line.
426: next;
427: }
428: if (!defined $hostip{$host}) { # This is a non cluster member
429: # The entry is of the form:
430: # cluname:hostname
431: # cluname - A 'cluster hostname' is needed in order to negotiate
432: # the host key.
433: # hostname- The dns name of the host.
434: #
435: my($cluname, $dnsname) = split(/:/, $host);
436:
437: my $ip = gethostbyname($dnsname);
438: if(defined($ip)) { # bad names don't deserve entry.
439: my $hostip = inet_ntoa($ip);
440: $managers{$hostip} = $cluname;
441: logthis('<font color="green"> registering manager '.
442: "$dnsname as $cluname with $hostip </font>\n");
443: }
444: } else {
445: logthis('<font color="green"> existing host'." $host</font>\n");
446: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber
447: }
448: }
449: }
450:
451: #
452: # ValidManager: Determines if a given certificate represents a valid manager.
453: # in this primitive implementation, the 'certificate' is
454: # just the connecting loncapa client name. This is checked
455: # against a valid client list in the configuration.
456: #
457: #
458: sub ValidManager {
459: my $certificate = shift;
460:
461: return isManager;
462: }
463: #
464: # CopyFile: Called as part of the process of installing a
465: # new configuration file. This function copies an existing
466: # file to a backup file.
467: # Parameters:
468: # oldfile - Name of the file to backup.
469: # newfile - Name of the backup file.
470: # Return:
471: # 0 - Failure (errno has failure reason).
472: # 1 - Success.
473: #
474: sub CopyFile {
475:
476: my ($oldfile, $newfile) = @_;
477:
478: if (! copy($oldfile,$newfile)) {
479: return 0;
480: }
481: chmod(0660, $newfile);
482: return 1;
483: }
484: #
485: # Host files are passed out with externally visible host IPs.
486: # If, for example, we are behind a fire-wall or NAT host, our
487: # internally visible IP may be different than the externally
488: # visible IP. Therefore, we always adjust the contents of the
489: # host file so that the entry for ME is the IP that we believe
490: # we have. At present, this is defined as the entry that
491: # DNS has for us. If by some chance we are not able to get a
492: # DNS translation for us, then we assume that the host.tab file
493: # is correct.
494: # BUGBUGBUG - in the future, we really should see if we can
495: # easily query the interface(s) instead.
496: # Parameter(s):
497: # contents - The contents of the host.tab to check.
498: # Returns:
499: # newcontents - The adjusted contents.
500: #
501: #
502: sub AdjustHostContents {
503: my $contents = shift;
504: my $adjusted;
505: my $me = $perlvar{'lonHostID'};
506:
507: foreach my $line (split(/\n/,$contents)) {
508: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
509: chomp($line);
510: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
511: if ($id eq $me) {
512: my $ip = gethostbyname($name);
513: my $ipnew = inet_ntoa($ip);
514: $ip = $ipnew;
515: # Reconstruct the host line and append to adjusted:
516:
517: my $newline = "$id:$domain:$role:$name:$ip";
518: if($maxcon ne "") { # Not all hosts have loncnew tuning params
519: $newline .= ":$maxcon:$idleto:$mincon";
520: }
521: $adjusted .= $newline."\n";
522:
523: } else { # Not me, pass unmodified.
524: $adjusted .= $line."\n";
525: }
526: } else { # Blank or comment never re-written.
527: $adjusted .= $line."\n"; # Pass blanks and comments as is.
528: }
529: }
530: return $adjusted;
531: }
532: #
533: # InstallFile: Called to install an administrative file:
534: # - The file is created with <name>.tmp
535: # - The <name>.tmp file is then mv'd to <name>
536: # This lugubrious procedure is done to ensure that we are never without
537: # a valid, even if dated, version of the file regardless of who crashes
538: # and when the crash occurs.
539: #
540: # Parameters:
541: # Name of the file
542: # File Contents.
543: # Return:
544: # nonzero - success.
545: # 0 - failure and $! has an errno.
546: #
547: sub InstallFile {
548:
549: my ($Filename, $Contents) = @_;
550: my $TempFile = $Filename.".tmp";
551:
552: # Open the file for write:
553:
554: my $fh = IO::File->new("> $TempFile"); # Write to temp.
555: if(!(defined $fh)) {
556: &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
557: return 0;
558: }
559: # write the contents of the file:
560:
561: print $fh ($Contents);
562: $fh->close; # In case we ever have a filesystem w. locking
563:
564: chmod(0660, $TempFile);
565:
566: # Now we can move install the file in position.
567:
568: move($TempFile, $Filename);
569:
570: return 1;
571: }
572:
573:
574: #
575: # ConfigFileFromSelector: converts a configuration file selector
576: # (one of host or domain at this point) into a
577: # configuration file pathname.
578: #
579: # Parameters:
580: # selector - Configuration file selector.
581: # Returns:
582: # Full path to the file or undef if the selector is invalid.
583: #
584: sub ConfigFileFromSelector {
585: my $selector = shift;
586: my $tablefile;
587:
588: my $tabledir = $perlvar{'lonTabDir'}.'/';
589: if ($selector eq "hosts") {
590: $tablefile = $tabledir."hosts.tab";
591: } elsif ($selector eq "domain") {
592: $tablefile = $tabledir."domain.tab";
593: } else {
594: return undef;
595: }
596: return $tablefile;
597:
598: }
599: #
600: # PushFile: Called to do an administrative push of a file.
601: # - Ensure the file being pushed is one we support.
602: # - Backup the old file to <filename.saved>
603: # - Separate the contents of the new file out from the
604: # rest of the request.
605: # - Write the new file.
606: # Parameter:
607: # Request - The entire user request. This consists of a : separated
608: # string pushfile:tablename:contents.
609: # NOTE: The contents may have :'s in it as well making things a bit
610: # more interesting... but not much.
611: # Returns:
612: # String to send to client ("ok" or "refused" if bad file).
613: #
614: sub PushFile {
615: my $request = shift;
616: my ($command, $filename, $contents) = split(":", $request, 3);
617:
618: # At this point in time, pushes for only the following tables are
619: # supported:
620: # hosts.tab ($filename eq host).
621: # domain.tab ($filename eq domain).
622: # Construct the destination filename or reject the request.
623: #
624: # lonManage is supposed to ensure this, however this session could be
625: # part of some elaborate spoof that managed somehow to authenticate.
626: #
627:
628:
629: my $tablefile = ConfigFileFromSelector($filename);
630: if(! (defined $tablefile)) {
631: return "refused";
632: }
633: #
634: # >copy< the old table to the backup table
635: # don't rename in case system crashes/reboots etc. in the time
636: # window between a rename and write.
637: #
638: my $backupfile = $tablefile;
639: $backupfile =~ s/\.tab$/.old/;
640: if(!CopyFile($tablefile, $backupfile)) {
641: &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
642: return "error:$!";
643: }
644: &logthis('<font color="green"> Pushfile: backed up '
645: .$tablefile." to $backupfile</font>");
646:
647: # If the file being pushed is the host file, we adjust the entry for ourself so that the
648: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible
649: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a
650: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
651: # that possibilty.
652:
653: if($filename eq "host") {
654: $contents = AdjustHostContents($contents);
655: }
656:
657: # Install the new file:
658:
659: if(!InstallFile($tablefile, $contents)) {
660: &logthis('<font color="red"> Pushfile: unable to install '
661: .$tablefile." $! </font>");
662: return "error:$!";
663: } else {
664: &logthis('<font color="green"> Installed new '.$tablefile
665: ."</font>");
666:
667: }
668:
669:
670: # Indicate success:
671:
672: return "ok";
673:
674: }
675:
676: #
677: # Called to re-init either lonc or lond.
678: #
679: # Parameters:
680: # request - The full request by the client. This is of the form
681: # reinit:<process>
682: # where <process> is allowed to be either of
683: # lonc or lond
684: #
685: # Returns:
686: # The string to be sent back to the client either:
687: # ok - Everything worked just fine.
688: # error:why - There was a failure and why describes the reason.
689: #
690: #
691: sub ReinitProcess {
692: my $request = shift;
693:
694:
695: # separate the request (reinit) from the process identifier and
696: # validate it producing the name of the .pid file for the process.
697: #
698: #
699: my ($junk, $process) = split(":", $request);
700: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
701: if($process eq 'lonc') {
702: $processpidfile = $processpidfile."lonc.pid";
703: if (!open(PIDFILE, "< $processpidfile")) {
704: return "error:Open failed for $processpidfile";
705: }
706: my $loncpid = <PIDFILE>;
707: close(PIDFILE);
708: logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
709: ."</font>");
710: kill("USR2", $loncpid);
711: } elsif ($process eq 'lond') {
712: logthis('<font color="red"> Reinitializing self (lond) </font>');
713: &UpdateHosts; # Lond is us!!
714: } else {
715: &logthis('<font color="yellow" Invalid reinit request for '.$process
716: ."</font>");
717: return "error:Invalid process identifier $process";
718: }
719: return 'ok';
720: }
721: # Validate a line in a configuration file edit script:
722: # Validation includes:
723: # - Ensuring the command is valid.
724: # - Ensuring the command has sufficient parameters
725: # Parameters:
726: # scriptline - A line to validate (\n has been stripped for what it's worth).
727: #
728: # Return:
729: # 0 - Invalid scriptline.
730: # 1 - Valid scriptline
731: # NOTE:
732: # Only the command syntax is checked, not the executability of the
733: # command.
734: #
735: sub isValidEditCommand {
736: my $scriptline = shift;
737:
738: # Line elements are pipe separated:
739:
740: my ($command, $key, $newline) = split(/\|/, $scriptline);
741: &logthis('<font color="green"> isValideditCommand checking: '.
742: "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
743:
744: if ($command eq "delete") {
745: #
746: # key with no newline.
747: #
748: if( ($key eq "") || ($newline ne "")) {
749: return 0; # Must have key but no newline.
750: } else {
751: return 1; # Valid syntax.
752: }
753: } elsif ($command eq "replace") {
754: #
755: # key and newline:
756: #
757: if (($key eq "") || ($newline eq "")) {
758: return 0;
759: } else {
760: return 1;
761: }
762: } elsif ($command eq "append") {
763: if (($key ne "") && ($newline eq "")) {
764: return 1;
765: } else {
766: return 0;
767: }
768: } else {
769: return 0; # Invalid command.
770: }
771: return 0; # Should not get here!!!
772: }
773: #
774: # ApplyEdit - Applies an edit command to a line in a configuration
775: # file. It is the caller's responsiblity to validate the
776: # edit line.
777: # Parameters:
778: # $directive - A single edit directive to apply.
779: # Edit directives are of the form:
780: # append|newline - Appends a new line to the file.
781: # replace|key|newline - Replaces the line with key value 'key'
782: # delete|key - Deletes the line with key value 'key'.
783: # $editor - A config file editor object that contains the
784: # file being edited.
785: #
786: sub ApplyEdit {
787:
788: my ($directive, $editor) = @_;
789:
790: # Break the directive down into its command and its parameters
791: # (at most two at this point. The meaning of the parameters, if in fact
792: # they exist depends on the command).
793:
794: my ($command, $p1, $p2) = split(/\|/, $directive);
795:
796: if($command eq "append") {
797: $editor->Append($p1); # p1 - key p2 null.
798: } elsif ($command eq "replace") {
799: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline.
800: } elsif ($command eq "delete") {
801: $editor->DeleteLine($p1); # p1 - key p2 null.
802: } else { # Should not get here!!!
803: die "Invalid command given to ApplyEdit $command"
804: }
805: }
806: #
807: # AdjustOurHost:
808: # Adjusts a host file stored in a configuration file editor object
809: # for the true IP address of this host. This is necessary for hosts
810: # that live behind a firewall.
811: # Those hosts have a publicly distributed IP of the firewall, but
812: # internally must use their actual IP. We assume that a given
813: # host only has a single IP interface for now.
814: # Formal Parameters:
815: # editor - The configuration file editor to adjust. This
816: # editor is assumed to contain a hosts.tab file.
817: # Strategy:
818: # - Figure out our hostname.
819: # - Lookup the entry for this host.
820: # - Modify the line to contain our IP
821: # - Do a replace for this host.
822: sub AdjustOurHost {
823: my $editor = shift;
824:
825: # figure out who I am.
826:
827: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname.
828:
829: # Get my host file entry.
830:
831: my $ConfigLine = $editor->Find($myHostName);
832: if(! (defined $ConfigLine)) {
833: die "AdjustOurHost - no entry for me in hosts file $myHostName";
834: }
835: # figure out my IP:
836: # Use the config line to get my hostname.
837: # Use gethostbyname to translate that into an IP address.
838: #
839: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
840: my $BinaryIp = gethostbyname($name);
841: my $ip = inet_ntoa($ip);
842: #
843: # Reassemble the config line from the elements in the list.
844: # Note that if the loncnew items were not present before, they will
845: # be now even if they would be empty
846: #
847: my $newConfigLine = $id;
848: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
849: $newConfigLine .= ":".$item;
850: }
851: # Replace the line:
852:
853: $editor->ReplaceLine($id, $newConfigLine);
854:
855: }
856: #
857: # ReplaceConfigFile:
858: # Replaces a configuration file with the contents of a
859: # configuration file editor object.
860: # This is done by:
861: # - Copying the target file to <filename>.old
862: # - Writing the new file to <filename>.tmp
863: # - Moving <filename.tmp> -> <filename>
864: # This laborious process ensures that the system is never without
865: # a configuration file that's at least valid (even if the contents
866: # may be dated).
867: # Parameters:
868: # filename - Name of the file to modify... this is a full path.
869: # editor - Editor containing the file.
870: #
871: sub ReplaceConfigFile {
872:
873: my ($filename, $editor) = @_;
874:
875: CopyFile ($filename, $filename.".old");
876:
877: my $contents = $editor->Get(); # Get the contents of the file.
878:
879: InstallFile($filename, $contents);
880: }
881: #
882: #
883: # Called to edit a configuration table file
884: # Parameters:
885: # request - The entire command/request sent by lonc or lonManage
886: # Return:
887: # The reply to send to the client.
888: #
889: sub EditFile {
890: my $request = shift;
891:
892: # Split the command into it's pieces: edit:filetype:script
893:
894: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script
895:
896: # Check the pre-coditions for success:
897:
898: if($request != "edit") { # Something is amiss afoot alack.
899: return "error:edit request detected, but request != 'edit'\n";
900: }
901: if( ($filetype ne "hosts") &&
902: ($filetype ne "domain")) {
903: return "error:edit requested with invalid file specifier: $filetype \n";
904: }
905:
906: # Split the edit script and check it's validity.
907:
908: my @scriptlines = split(/\n/, $script); # one line per element.
909: my $linecount = scalar(@scriptlines);
910: for(my $i = 0; $i < $linecount; $i++) {
911: chomp($scriptlines[$i]);
912: if(!isValidEditCommand($scriptlines[$i])) {
913: return "error:edit with bad script line: '$scriptlines[$i]' \n";
914: }
915: }
916:
917: # Execute the edit operation.
918: # - Create a config file editor for the appropriate file and
919: # - execute each command in the script:
920: #
921: my $configfile = ConfigFileFromSelector($filetype);
922: if (!(defined $configfile)) {
923: return "refused\n";
924: }
925: my $editor = ConfigFileEdit->new($configfile);
926:
927: for (my $i = 0; $i < $linecount; $i++) {
928: ApplyEdit($scriptlines[$i], $editor);
929: }
930: # If the file is the host file, ensure that our host is
931: # adjusted to have our ip:
932: #
933: if($filetype eq "host") {
934: AdjustOurHost($editor);
935: }
936: # Finally replace the current file with our file.
937: #
938: ReplaceConfigFile($configfile, $editor);
939:
940: return "ok\n";
941: }
942:
943: #---------------------------------------------------------------
944: #
945: # Manipulation of hash based databases (factoring out common code
946: # for later use as we refactor.
947: #
948: # Ties a domain level resource file to a hash.
949: # If requested a history entry is created in the associated hist file.
950: #
951: # Parameters:
952: # domain - Name of the domain in which the resource file lives.
953: # namespace - Name of the hash within that domain.
954: # how - How to tie the hash (e.g. GDBM_WRCREAT()).
955: # loghead - Optional parameter, if present a log entry is created
956: # in the associated history file and this is the first part
957: # of that entry.
958: # logtail - Goes along with loghead, The actual logentry is of the
959: # form $loghead:<timestamp>:logtail.
960: # Returns:
961: # Reference to a hash bound to the db file or alternatively undef
962: # if the tie failed.
963: #
964: sub tie_domain_hash {
965: my ($domain,$namespace,$how,$loghead,$logtail) = @_;
966:
967: # Filter out any whitespace in the domain name:
968:
969: $domain =~ s/\W//g;
970:
971: # We have enough to go on to tie the hash:
972:
973: my $user_top_dir = $perlvar{'lonUsersDir'};
974: my $domain_dir = $user_top_dir."/$domain";
975: my $resource_file = $domain_dir."/$namespace";
976: return &_locking_hash_tie($resource_file,$namespace,$how,$loghead,$logtail);
977: }
978:
979: sub untie_domain_hash {
980: return &_locking_hash_untie(@_);
981: }
982: #
983: # Ties a user's resource file to a hash.
984: # If necessary, an appropriate history
985: # log file entry is made as well.
986: # This sub factors out common code from the subs that manipulate
987: # the various gdbm files that keep keyword value pairs.
988: # Parameters:
989: # domain - Name of the domain the user is in.
990: # user - Name of the 'current user'.
991: # namespace - Namespace representing the file to tie.
992: # how - What the tie is done to (e.g. GDBM_WRCREAT().
993: # loghead - Optional first part of log entry if there may be a
994: # history file.
995: # what - Optional tail of log entry if there may be a history
996: # file.
997: # Returns:
998: # hash to which the database is tied. It's up to the caller to untie.
999: # undef if the has could not be tied.
1000: #
1001: sub tie_user_hash {
1002: my ($domain,$user,$namespace,$how,$loghead,$what) = @_;
1003:
1004: $namespace=~s/\//\_/g; # / -> _
1005: $namespace=~s/\W//g; # whitespace eliminated.
1006: my $proname = propath($domain, $user);
1007:
1008: my $file_prefix="$proname/$namespace";
1009: return &_locking_hash_tie($file_prefix,$namespace,$how,$loghead,$what);
1010: }
1011:
1012: sub untie_user_hash {
1013: return &_locking_hash_untie(@_);
1014: }
1015:
1016: # internal routines that handle the actual tieing and untieing process
1017:
1018: sub _do_hash_tie {
1019: my ($file_prefix,$namespace,$how,$loghead,$what) = @_;
1020: my %hash;
1021: if(tie(%hash, 'GDBM_File', "$file_prefix.db", $how, 0640)) {
1022: # If this is a namespace for which a history is kept,
1023: # make the history log entry:
1024: if (($namespace !~/^nohist\_/) && (defined($loghead))) {
1025: my $args = scalar @_;
1026: Debug(" Opening history: $file_prefix $args");
1027: my $hfh = IO::File->new(">>$file_prefix.hist");
1028: if($hfh) {
1029: my $now = time;
1030: print $hfh "$loghead:$now:$what\n";
1031: }
1032: $hfh->close;
1033: }
1034: return \%hash;
1035: } else {
1036: return undef;
1037: }
1038: }
1039:
1040: sub _do_hash_untie {
1041: my ($hashref) = @_;
1042: my $result = untie(%$hashref);
1043: return $result;
1044: }
1045:
1046: {
1047: my $sym;
1048:
1049: sub _locking_hash_tie {
1050: my ($file_prefix,$namespace,$how,$loghead,$what) = @_;
1051: my $lock_type=LOCK_SH;
1052: # Are we reading or writing?
1053: if ($how eq &GDBM_READER()) {
1054: # We are reading
1055: if (!open($sym,"$file_prefix.db.lock")) {
1056: # We don't have a lock file. This could mean
1057: # - that there is no such db-file
1058: # - that it does not have a lock file yet
1059: if ((! -e "$file_prefix.db") && (! -e "$file_prefix.db.gz")) {
1060: # No such file. Forget it.
1061: $! = 2;
1062: return undef;
1063: }
1064: # Apparently just no lock file yet. Make one
1065: open($sym,">>$file_prefix.db.lock");
1066: }
1067: } elsif ($how eq &GDBM_WRCREAT()) {
1068: # We are writing
1069: open($sym,">>$file_prefix.db.lock");
1070: # Writing needs exclusive lock
1071: $lock_type=LOCK_EX;
1072: } else {
1073: &logthis("Unknown method $how for $file_prefix");
1074: die();
1075: }
1076: # If this is compressed, we will also need an exclusive lock
1077: if (-e "$file_prefix.db.gz") { $lock_type=LOCK_EX; }
1078: # Okay, try to obtain the lock we want
1079: my $failed=0;
1080: eval {
1081: local $SIG{__DIE__}='DEFAULT';
1082: local $SIG{ALRM}=sub {
1083: $failed=1;
1084: die("failed lock");
1085: };
1086: alarm($lond_max_wait_time);
1087: flock($sym,$lock_type);
1088: alarm(0);
1089: };
1090: if ($failed) {
1091: $! = 100; # throwing error # 100
1092: return undef;
1093: }
1094: # The file is ours!
1095: # If it is archived, un-archive it now
1096: if (-e "$file_prefix.db.gz") {
1097: system("gunzip $file_prefix.db.gz");
1098: if (-e "$file_prefix.hist.gz") {
1099: system("gunzip $file_prefix.hist.gz");
1100: }
1101: }
1102: # Change access mode to non-blocking
1103: $how=$how|&GDBM_NOLOCK();
1104: # Go ahead and tie the hash
1105: return &_do_hash_tie($file_prefix,$namespace,$how,$loghead,$what);
1106: }
1107:
1108: sub _locking_hash_untie {
1109: my ($hashref) = @_;
1110: my $result = untie(%$hashref);
1111: flock($sym,LOCK_UN);
1112: close($sym);
1113: undef($sym);
1114: return $result;
1115: }
1116: }
1117:
1118: # read_profile
1119: #
1120: # Returns a set of specific entries from a user's profile file.
1121: # this is a utility function that is used by both get_profile_entry and
1122: # get_profile_entry_encrypted.
1123: #
1124: # Parameters:
1125: # udom - Domain in which the user exists.
1126: # uname - User's account name (loncapa account)
1127: # namespace - The profile namespace to open.
1128: # what - A set of & separated queries.
1129: # Returns:
1130: # If all ok: - The string that needs to be shipped back to the user.
1131: # If failure - A string that starts with error: followed by the failure
1132: # reason.. note that this probabyl gets shipped back to the
1133: # user as well.
1134: #
1135: sub read_profile {
1136: my ($udom, $uname, $namespace, $what) = @_;
1137:
1138: my $hashref = &tie_user_hash($udom, $uname, $namespace,
1139: &GDBM_READER());
1140: if ($hashref) {
1141: my @queries=split(/\&/,$what);
1142: my $qresult='';
1143:
1144: for (my $i=0;$i<=$#queries;$i++) {
1145: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string.
1146: }
1147: $qresult=~s/\&$//; # Remove trailing & from last lookup.
1148: if (&untie_user_hash($hashref)) {
1149: return $qresult;
1150: } else {
1151: return "error: ".($!+0)." untie (GDBM) Failed";
1152: }
1153: } else {
1154: if ($!+0 == 2) {
1155: return "error:No such file or GDBM reported bad block error";
1156: } else {
1157: return "error: ".($!+0)." tie (GDBM) Failed";
1158: }
1159: }
1160:
1161: }
1162: #--------------------- Request Handlers --------------------------------------------
1163: #
1164: # By convention each request handler registers itself prior to the sub
1165: # declaration:
1166: #
1167:
1168: #++
1169: #
1170: # Handles ping requests.
1171: # Parameters:
1172: # $cmd - the actual keyword that invoked us.
1173: # $tail - the tail of the request that invoked us.
1174: # $replyfd- File descriptor connected to the client
1175: # Implicit Inputs:
1176: # $currenthostid - Global variable that carries the name of the host we are
1177: # known as.
1178: # Returns:
1179: # 1 - Ok to continue processing.
1180: # 0 - Program should exit.
1181: # Side effects:
1182: # Reply information is sent to the client.
1183: sub ping_handler {
1184: my ($cmd, $tail, $client) = @_;
1185: Debug("$cmd $tail $client .. $currenthostid:");
1186:
1187: Reply( $client,"$currenthostid\n","$cmd:$tail");
1188:
1189: return 1;
1190: }
1191: ®ister_handler("ping", \&ping_handler, 0, 1, 1); # Ping unencoded, client or manager.
1192:
1193: #++
1194: #
1195: # Handles pong requests. Pong replies with our current host id, and
1196: # the results of a ping sent to us via our lonc.
1197: #
1198: # Parameters:
1199: # $cmd - the actual keyword that invoked us.
1200: # $tail - the tail of the request that invoked us.
1201: # $replyfd- File descriptor connected to the client
1202: # Implicit Inputs:
1203: # $currenthostid - Global variable that carries the name of the host we are
1204: # connected to.
1205: # Returns:
1206: # 1 - Ok to continue processing.
1207: # 0 - Program should exit.
1208: # Side effects:
1209: # Reply information is sent to the client.
1210: sub pong_handler {
1211: my ($cmd, $tail, $replyfd) = @_;
1212:
1213: my $reply=&reply("ping",$clientname);
1214: &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
1215: return 1;
1216: }
1217: ®ister_handler("pong", \&pong_handler, 0, 1, 1); # Pong unencoded, client or manager
1218:
1219: #++
1220: # Called to establish an encrypted session key with the remote client.
1221: # Note that with secure lond, in most cases this function is never
1222: # invoked. Instead, the secure session key is established either
1223: # via a local file that's locked down tight and only lives for a short
1224: # time, or via an ssl tunnel...and is generated from a bunch-o-random
1225: # bits from /dev/urandom, rather than the predictable pattern used by
1226: # by this sub. This sub is only used in the old-style insecure
1227: # key negotiation.
1228: # Parameters:
1229: # $cmd - the actual keyword that invoked us.
1230: # $tail - the tail of the request that invoked us.
1231: # $replyfd- File descriptor connected to the client
1232: # Implicit Inputs:
1233: # $currenthostid - Global variable that carries the name of the host
1234: # known as.
1235: # $clientname - Global variable that carries the name of the hsot we're connected to.
1236: # Returns:
1237: # 1 - Ok to continue processing.
1238: # 0 - Program should exit.
1239: # Implicit Outputs:
1240: # Reply information is sent to the client.
1241: # $cipher is set with a reference to a new IDEA encryption object.
1242: #
1243: sub establish_key_handler {
1244: my ($cmd, $tail, $replyfd) = @_;
1245:
1246: my $buildkey=time.$$.int(rand 100000);
1247: $buildkey=~tr/1-6/A-F/;
1248: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
1249: my $key=$currenthostid.$clientname;
1250: $key=~tr/a-z/A-Z/;
1251: $key=~tr/G-P/0-9/;
1252: $key=~tr/Q-Z/0-9/;
1253: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
1254: $key=substr($key,0,32);
1255: my $cipherkey=pack("H32",$key);
1256: $cipher=new IDEA $cipherkey;
1257: &Reply($replyfd, "$buildkey\n", "$cmd:$tail");
1258:
1259: return 1;
1260:
1261: }
1262: ®ister_handler("ekey", \&establish_key_handler, 0, 1,1);
1263:
1264: # Handler for the load command. Returns the current system load average
1265: # to the requestor.
1266: #
1267: # Parameters:
1268: # $cmd - the actual keyword that invoked us.
1269: # $tail - the tail of the request that invoked us.
1270: # $replyfd- File descriptor connected to the client
1271: # Implicit Inputs:
1272: # $currenthostid - Global variable that carries the name of the host
1273: # known as.
1274: # $clientname - Global variable that carries the name of the hsot we're connected to.
1275: # Returns:
1276: # 1 - Ok to continue processing.
1277: # 0 - Program should exit.
1278: # Side effects:
1279: # Reply information is sent to the client.
1280: sub load_handler {
1281: my ($cmd, $tail, $replyfd) = @_;
1282:
1283: # Get the load average from /proc/loadavg and calculate it as a percentage of
1284: # the allowed load limit as set by the perl global variable lonLoadLim
1285:
1286: my $loadavg;
1287: my $loadfile=IO::File->new('/proc/loadavg');
1288:
1289: $loadavg=<$loadfile>;
1290: $loadavg =~ s/\s.*//g; # Extract the first field only.
1291:
1292: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
1293:
1294: &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
1295:
1296: return 1;
1297: }
1298: ®ister_handler("load", \&load_handler, 0, 1, 0);
1299:
1300: #
1301: # Process the userload request. This sub returns to the client the current
1302: # user load average. It can be invoked either by clients or managers.
1303: #
1304: # Parameters:
1305: # $cmd - the actual keyword that invoked us.
1306: # $tail - the tail of the request that invoked us.
1307: # $replyfd- File descriptor connected to the client
1308: # Implicit Inputs:
1309: # $currenthostid - Global variable that carries the name of the host
1310: # known as.
1311: # $clientname - Global variable that carries the name of the hsot we're connected to.
1312: # Returns:
1313: # 1 - Ok to continue processing.
1314: # 0 - Program should exit
1315: # Implicit inputs:
1316: # whatever the userload() function requires.
1317: # Implicit outputs:
1318: # the reply is written to the client.
1319: #
1320: sub user_load_handler {
1321: my ($cmd, $tail, $replyfd) = @_;
1322:
1323: my $userloadpercent=&userload();
1324: &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
1325:
1326: return 1;
1327: }
1328: ®ister_handler("userload", \&user_load_handler, 0, 1, 0);
1329:
1330: # Process a request for the authorization type of a user:
1331: # (userauth).
1332: #
1333: # Parameters:
1334: # $cmd - the actual keyword that invoked us.
1335: # $tail - the tail of the request that invoked us.
1336: # $replyfd- File descriptor connected to the client
1337: # Returns:
1338: # 1 - Ok to continue processing.
1339: # 0 - Program should exit
1340: # Implicit outputs:
1341: # The user authorization type is written to the client.
1342: #
1343: sub user_authorization_type {
1344: my ($cmd, $tail, $replyfd) = @_;
1345:
1346: my $userinput = "$cmd:$tail";
1347:
1348: # Pull the domain and username out of the command tail.
1349: # and call get_auth_type to determine the authentication type.
1350:
1351: my ($udom,$uname)=split(/:/,$tail);
1352: my $result = &get_auth_type($udom, $uname);
1353: if($result eq "nouser") {
1354: &Failure( $replyfd, "unknown_user\n", $userinput);
1355: } else {
1356: #
1357: # We only want to pass the second field from get_auth_type
1358: # for ^krb.. otherwise we'll be handing out the encrypted
1359: # password for internals e.g.
1360: #
1361: my ($type,$otherinfo) = split(/:/,$result);
1362: if($type =~ /^krb/) {
1363: $type = $result;
1364: } else {
1365: $type .= ':';
1366: }
1367: &Reply( $replyfd, "$type\n", $userinput);
1368: }
1369:
1370: return 1;
1371: }
1372: ®ister_handler("currentauth", \&user_authorization_type, 1, 1, 0);
1373:
1374: # Process a request by a manager to push a hosts or domain table
1375: # to us. We pick apart the command and pass it on to the subs
1376: # that already exist to do this.
1377: #
1378: # Parameters:
1379: # $cmd - the actual keyword that invoked us.
1380: # $tail - the tail of the request that invoked us.
1381: # $client - File descriptor connected to the client
1382: # Returns:
1383: # 1 - Ok to continue processing.
1384: # 0 - Program should exit
1385: # Implicit Output:
1386: # a reply is written to the client.
1387: sub push_file_handler {
1388: my ($cmd, $tail, $client) = @_;
1389:
1390: my $userinput = "$cmd:$tail";
1391:
1392: # At this time we only know that the IP of our partner is a valid manager
1393: # the code below is a hook to do further authentication (e.g. to resolve
1394: # spoofing).
1395:
1396: my $cert = &GetCertificate($userinput);
1397: if(&ValidManager($cert)) {
1398:
1399: # Now presumably we have the bona fides of both the peer host and the
1400: # process making the request.
1401:
1402: my $reply = &PushFile($userinput);
1403: &Reply($client, "$reply\n", $userinput);
1404:
1405: } else {
1406: &Failure( $client, "refused\n", $userinput);
1407: }
1408: return 1;
1409: }
1410: ®ister_handler("pushfile", \&push_file_handler, 1, 0, 1);
1411:
1412: #
1413: # du - list the disk usuage of a directory recursively.
1414: #
1415: # note: stolen code from the ls file handler
1416: # under construction by Rick Banghart
1417: # .
1418: # Parameters:
1419: # $cmd - The command that dispatched us (du).
1420: # $ududir - The directory path to list... I'm not sure what this
1421: # is relative as things like ls:. return e.g.
1422: # no_such_dir.
1423: # $client - Socket open on the client.
1424: # Returns:
1425: # 1 - indicating that the daemon should not disconnect.
1426: # Side Effects:
1427: # The reply is written to $client.
1428: #
1429: sub du_handler {
1430: my ($cmd, $ududir, $client) = @_;
1431: my ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
1432: my $userinput = "$cmd:$ududir";
1433:
1434: if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
1435: &Failure($client,"refused\n","$cmd:$ududir");
1436: return 1;
1437: }
1438: # Since $ududir could have some nasties in it,
1439: # we will require that ududir is a valid
1440: # directory. Just in case someone tries to
1441: # slip us a line like .;(cd /home/httpd rm -rf*)
1442: # etc.
1443: #
1444: if (-d $ududir) {
1445: my $total_size=0;
1446: my $code=sub {
1447: if ($_=~/\.\d+\./) { return;}
1448: if ($_=~/\.meta$/) { return;}
1449: $total_size+=(stat($_))[7];
1450: };
1451: chdir($ududir);
1452: find($code,$ududir);
1453: $total_size=int($total_size/1024);
1454: &Reply($client,"$total_size\n","$cmd:$ududir");
1455: } else {
1456: &Failure($client, "bad_directory:$ududir\n","$cmd:$ududir");
1457: }
1458: return 1;
1459: }
1460: ®ister_handler("du", \&du_handler, 0, 1, 0);
1461:
1462: #
1463: # The ls_handler routine should be considered obosolete and is retained
1464: # for communication with legacy servers. Please see the ls2_handler.
1465: #
1466: # ls - list the contents of a directory. For each file in the
1467: # selected directory the filename followed by the full output of
1468: # the stat function is returned. The returned info for each
1469: # file are separated by ':'. The stat fields are separated by &'s.
1470: # Parameters:
1471: # $cmd - The command that dispatched us (ls).
1472: # $ulsdir - The directory path to list... I'm not sure what this
1473: # is relative as things like ls:. return e.g.
1474: # no_such_dir.
1475: # $client - Socket open on the client.
1476: # Returns:
1477: # 1 - indicating that the daemon should not disconnect.
1478: # Side Effects:
1479: # The reply is written to $client.
1480: #
1481: sub ls_handler {
1482: # obsoleted by ls2_handler
1483: my ($cmd, $ulsdir, $client) = @_;
1484:
1485: my $userinput = "$cmd:$ulsdir";
1486:
1487: my $obs;
1488: my $rights;
1489: my $ulsout='';
1490: my $ulsfn;
1491: if (-e $ulsdir) {
1492: if(-d $ulsdir) {
1493: if (opendir(LSDIR,$ulsdir)) {
1494: while ($ulsfn=readdir(LSDIR)) {
1495: undef($obs);
1496: undef($rights);
1497: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1498: #We do some obsolete checking here
1499: if(-e $ulsdir.'/'.$ulsfn.".meta") {
1500: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
1501: my @obsolete=<FILE>;
1502: foreach my $obsolete (@obsolete) {
1503: if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
1504: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
1505: }
1506: }
1507: $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
1508: if($obs eq '1') { $ulsout.="&1"; }
1509: else { $ulsout.="&0"; }
1510: if($rights eq '1') { $ulsout.="&1:"; }
1511: else { $ulsout.="&0:"; }
1512: }
1513: closedir(LSDIR);
1514: }
1515: } else {
1516: my @ulsstats=stat($ulsdir);
1517: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1518: }
1519: } else {
1520: $ulsout='no_such_dir';
1521: }
1522: if ($ulsout eq '') { $ulsout='empty'; }
1523: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1524:
1525: return 1;
1526:
1527: }
1528: ®ister_handler("ls", \&ls_handler, 0, 1, 0);
1529:
1530: #
1531: # Please also see the ls_handler, which this routine obosolets.
1532: # ls2_handler differs from ls_handler in that it escapes its return
1533: # values before concatenating them together with ':'s.
1534: #
1535: # ls2 - list the contents of a directory. For each file in the
1536: # selected directory the filename followed by the full output of
1537: # the stat function is returned. The returned info for each
1538: # file are separated by ':'. The stat fields are separated by &'s.
1539: # Parameters:
1540: # $cmd - The command that dispatched us (ls).
1541: # $ulsdir - The directory path to list... I'm not sure what this
1542: # is relative as things like ls:. return e.g.
1543: # no_such_dir.
1544: # $client - Socket open on the client.
1545: # Returns:
1546: # 1 - indicating that the daemon should not disconnect.
1547: # Side Effects:
1548: # The reply is written to $client.
1549: #
1550: sub ls2_handler {
1551: my ($cmd, $ulsdir, $client) = @_;
1552:
1553: my $userinput = "$cmd:$ulsdir";
1554:
1555: my $obs;
1556: my $rights;
1557: my $ulsout='';
1558: my $ulsfn;
1559: if (-e $ulsdir) {
1560: if(-d $ulsdir) {
1561: if (opendir(LSDIR,$ulsdir)) {
1562: while ($ulsfn=readdir(LSDIR)) {
1563: undef($obs);
1564: undef($rights);
1565: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1566: #We do some obsolete checking here
1567: if(-e $ulsdir.'/'.$ulsfn.".meta") {
1568: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
1569: my @obsolete=<FILE>;
1570: foreach my $obsolete (@obsolete) {
1571: if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
1572: if($obsolete =~ m|(<copyright>)(default)|) {
1573: $rights = 1;
1574: }
1575: }
1576: }
1577: my $tmp = $ulsfn.'&'.join('&',@ulsstats);
1578: if ($obs eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
1579: if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
1580: $ulsout.= &escape($tmp).':';
1581: }
1582: closedir(LSDIR);
1583: }
1584: } else {
1585: my @ulsstats=stat($ulsdir);
1586: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1587: }
1588: } else {
1589: $ulsout='no_such_dir';
1590: }
1591: if ($ulsout eq '') { $ulsout='empty'; }
1592: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1593: return 1;
1594: }
1595: ®ister_handler("ls2", \&ls2_handler, 0, 1, 0);
1596:
1597: # Process a reinit request. Reinit requests that either
1598: # lonc or lond be reinitialized so that an updated
1599: # host.tab or domain.tab can be processed.
1600: #
1601: # Parameters:
1602: # $cmd - the actual keyword that invoked us.
1603: # $tail - the tail of the request that invoked us.
1604: # $client - File descriptor connected to the client
1605: # Returns:
1606: # 1 - Ok to continue processing.
1607: # 0 - Program should exit
1608: # Implicit output:
1609: # a reply is sent to the client.
1610: #
1611: sub reinit_process_handler {
1612: my ($cmd, $tail, $client) = @_;
1613:
1614: my $userinput = "$cmd:$tail";
1615:
1616: my $cert = &GetCertificate($userinput);
1617: if(&ValidManager($cert)) {
1618: chomp($userinput);
1619: my $reply = &ReinitProcess($userinput);
1620: &Reply( $client, "$reply\n", $userinput);
1621: } else {
1622: &Failure( $client, "refused\n", $userinput);
1623: }
1624: return 1;
1625: }
1626: ®ister_handler("reinit", \&reinit_process_handler, 1, 0, 1);
1627:
1628: # Process the editing script for a table edit operation.
1629: # the editing operation must be encrypted and requested by
1630: # a manager host.
1631: #
1632: # Parameters:
1633: # $cmd - the actual keyword that invoked us.
1634: # $tail - the tail of the request that invoked us.
1635: # $client - File descriptor connected to the client
1636: # Returns:
1637: # 1 - Ok to continue processing.
1638: # 0 - Program should exit
1639: # Implicit output:
1640: # a reply is sent to the client.
1641: #
1642: sub edit_table_handler {
1643: my ($command, $tail, $client) = @_;
1644:
1645: my $userinput = "$command:$tail";
1646:
1647: my $cert = &GetCertificate($userinput);
1648: if(&ValidManager($cert)) {
1649: my($filetype, $script) = split(/:/, $tail);
1650: if (($filetype eq "hosts") ||
1651: ($filetype eq "domain")) {
1652: if($script ne "") {
1653: &Reply($client, # BUGBUG - EditFile
1654: &EditFile($userinput), # could fail.
1655: $userinput);
1656: } else {
1657: &Failure($client,"refused\n",$userinput);
1658: }
1659: } else {
1660: &Failure($client,"refused\n",$userinput);
1661: }
1662: } else {
1663: &Failure($client,"refused\n",$userinput);
1664: }
1665: return 1;
1666: }
1667: ®ister_handler("edit", \&edit_table_handler, 1, 0, 1);
1668:
1669: #
1670: # Authenticate a user against the LonCAPA authentication
1671: # database. Note that there are several authentication
1672: # possibilities:
1673: # - unix - The user can be authenticated against the unix
1674: # password file.
1675: # - internal - The user can be authenticated against a purely
1676: # internal per user password file.
1677: # - kerberos - The user can be authenticated against either a kerb4 or kerb5
1678: # ticket granting authority.
1679: # - user - The person tailoring LonCAPA can supply a user authentication
1680: # mechanism that is per system.
1681: #
1682: # Parameters:
1683: # $cmd - The command that got us here.
1684: # $tail - Tail of the command (remaining parameters).
1685: # $client - File descriptor connected to client.
1686: # Returns
1687: # 0 - Requested to exit, caller should shut down.
1688: # 1 - Continue processing.
1689: # Implicit inputs:
1690: # The authentication systems describe above have their own forms of implicit
1691: # input into the authentication process that are described above.
1692: #
1693: sub authenticate_handler {
1694: my ($cmd, $tail, $client) = @_;
1695:
1696:
1697: # Regenerate the full input line
1698:
1699: my $userinput = $cmd.":".$tail;
1700:
1701: # udom - User's domain.
1702: # uname - Username.
1703: # upass - User's password.
1704:
1705: my ($udom,$uname,$upass)=split(/:/,$tail);
1706: &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
1707: chomp($upass);
1708: $upass=&unescape($upass);
1709:
1710: my $pwdcorrect = &validate_user($udom, $uname, $upass);
1711: if($pwdcorrect) {
1712: &Reply( $client, "authorized\n", $userinput);
1713: #
1714: # Bad credentials: Failed to authorize
1715: #
1716: } else {
1717: &Failure( $client, "non_authorized\n", $userinput);
1718: }
1719:
1720: return 1;
1721: }
1722: ®ister_handler("auth", \&authenticate_handler, 1, 1, 0);
1723:
1724: #
1725: # Change a user's password. Note that this function is complicated by
1726: # the fact that a user may be authenticated in more than one way:
1727: # At present, we are not able to change the password for all types of
1728: # authentication methods. Only for:
1729: # unix - unix password or shadow passoword style authentication.
1730: # local - Locally written authentication mechanism.
1731: # For now, kerb4 and kerb5 password changes are not supported and result
1732: # in an error.
1733: # FUTURE WORK:
1734: # Support kerberos passwd changes?
1735: # Parameters:
1736: # $cmd - The command that got us here.
1737: # $tail - Tail of the command (remaining parameters).
1738: # $client - File descriptor connected to client.
1739: # Returns
1740: # 0 - Requested to exit, caller should shut down.
1741: # 1 - Continue processing.
1742: # Implicit inputs:
1743: # The authentication systems describe above have their own forms of implicit
1744: # input into the authentication process that are described above.
1745: sub change_password_handler {
1746: my ($cmd, $tail, $client) = @_;
1747:
1748: my $userinput = $cmd.":".$tail; # Reconstruct client's string.
1749:
1750: #
1751: # udom - user's domain.
1752: # uname - Username.
1753: # upass - Current password.
1754: # npass - New password.
1755:
1756: my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
1757:
1758: $upass=&unescape($upass);
1759: $npass=&unescape($npass);
1760: &Debug("Trying to change password for $uname");
1761:
1762: # First require that the user can be authenticated with their
1763: # old password:
1764:
1765: my $validated = &validate_user($udom, $uname, $upass);
1766: if($validated) {
1767: my $realpasswd = &get_auth_type($udom, $uname); # Defined since authd.
1768:
1769: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
1770: if ($howpwd eq 'internal') {
1771: &Debug("internal auth");
1772: my $salt=time;
1773: $salt=substr($salt,6,2);
1774: my $ncpass=crypt($npass,$salt);
1775: if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
1776: &logthis("Result of password change for "
1777: ."$uname: pwchange_success");
1778: &Reply($client, "ok\n", $userinput);
1779: } else {
1780: &logthis("Unable to open $uname passwd "
1781: ."to change password");
1782: &Failure( $client, "non_authorized\n",$userinput);
1783: }
1784: } elsif ($howpwd eq 'unix') {
1785: my $result = &change_unix_password($uname, $npass);
1786: &logthis("Result of password change for $uname: ".
1787: $result);
1788: &Reply($client, "$result\n", $userinput);
1789: } else {
1790: # this just means that the current password mode is not
1791: # one we know how to change (e.g the kerberos auth modes or
1792: # locally written auth handler).
1793: #
1794: &Failure( $client, "auth_mode_error\n", $userinput);
1795: }
1796:
1797: } else {
1798: &Failure( $client, "non_authorized\n", $userinput);
1799: }
1800:
1801: return 1;
1802: }
1803: ®ister_handler("passwd", \&change_password_handler, 1, 1, 0);
1804:
1805: #
1806: # Create a new user. User in this case means a lon-capa user.
1807: # The user must either already exist in some authentication realm
1808: # like kerberos or the /etc/passwd. If not, a user completely local to
1809: # this loncapa system is created.
1810: #
1811: # Parameters:
1812: # $cmd - The command that got us here.
1813: # $tail - Tail of the command (remaining parameters).
1814: # $client - File descriptor connected to client.
1815: # Returns
1816: # 0 - Requested to exit, caller should shut down.
1817: # 1 - Continue processing.
1818: # Implicit inputs:
1819: # The authentication systems describe above have their own forms of implicit
1820: # input into the authentication process that are described above.
1821: sub add_user_handler {
1822:
1823: my ($cmd, $tail, $client) = @_;
1824:
1825:
1826: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1827: my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
1828:
1829: &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
1830:
1831:
1832: if($udom eq $currentdomainid) { # Reject new users for other domains...
1833:
1834: my $oldumask=umask(0077);
1835: chomp($npass);
1836: $npass=&unescape($npass);
1837: my $passfilename = &password_path($udom, $uname);
1838: &Debug("Password file created will be:".$passfilename);
1839: if (-e $passfilename) {
1840: &Failure( $client, "already_exists\n", $userinput);
1841: } else {
1842: my $fperror='';
1843: if (!&mkpath($passfilename)) {
1844: $fperror="error: ".($!+0)." mkdir failed while attempting "
1845: ."makeuser";
1846: }
1847: unless ($fperror) {
1848: my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
1849: &Reply($client, $result, $userinput); #BUGBUG - could be fail
1850: } else {
1851: &Failure($client, "$fperror\n", $userinput);
1852: }
1853: }
1854: umask($oldumask);
1855: } else {
1856: &Failure($client, "not_right_domain\n",
1857: $userinput); # Even if we are multihomed.
1858:
1859: }
1860: return 1;
1861:
1862: }
1863: ®ister_handler("makeuser", \&add_user_handler, 1, 1, 0);
1864:
1865: #
1866: # Change the authentication method of a user. Note that this may
1867: # also implicitly change the user's password if, for example, the user is
1868: # joining an existing authentication realm. Known authentication realms at
1869: # this time are:
1870: # internal - Purely internal password file (only loncapa knows this user)
1871: # local - Institutionally written authentication module.
1872: # unix - Unix user (/etc/passwd with or without /etc/shadow).
1873: # kerb4 - kerberos version 4
1874: # kerb5 - kerberos version 5
1875: #
1876: # Parameters:
1877: # $cmd - The command that got us here.
1878: # $tail - Tail of the command (remaining parameters).
1879: # $client - File descriptor connected to client.
1880: # Returns
1881: # 0 - Requested to exit, caller should shut down.
1882: # 1 - Continue processing.
1883: # Implicit inputs:
1884: # The authentication systems describe above have their own forms of implicit
1885: # input into the authentication process that are described above.
1886: # NOTE:
1887: # This is also used to change the authentication credential values (e.g. passwd).
1888: #
1889: #
1890: sub change_authentication_handler {
1891:
1892: my ($cmd, $tail, $client) = @_;
1893:
1894: my $userinput = "$cmd:$tail"; # Reconstruct user input.
1895:
1896: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1897: &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
1898: if ($udom ne $currentdomainid) {
1899: &Failure( $client, "not_right_domain\n", $client);
1900: } else {
1901:
1902: chomp($npass);
1903:
1904: $npass=&unescape($npass);
1905: my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
1906: my $passfilename = &password_path($udom, $uname);
1907: if ($passfilename) { # Not allowed to create a new user!!
1908: # If just changing the unix passwd. need to arrange to run
1909: # passwd since otherwise make_passwd_file will run
1910: # lcuseradd which fails if an account already exists
1911: # (to prevent an unscrupulous LONCAPA admin from stealing
1912: # an existing account by overwriting it as a LonCAPA account).
1913:
1914: if(($oldauth =~/^unix/) && ($umode eq "unix")) {
1915: my $result = &change_unix_password($uname, $npass);
1916: &logthis("Result of password change for $uname: ".$result);
1917: if ($result eq "ok") {
1918: &Reply($client, "$result\n")
1919: } else {
1920: &Failure($client, "$result\n");
1921: }
1922: } else {
1923: my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
1924: #
1925: # If the current auth mode is internal, and the old auth mode was
1926: # unix, or krb*, and the user is an author for this domain,
1927: # re-run manage_permissions for that role in order to be able
1928: # to take ownership of the construction space back to www:www
1929: #
1930:
1931:
1932: if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
1933: (($oldauth =~ /^internal/) && ($umode eq "unix")) ) {
1934: if(&is_author($udom, $uname)) {
1935: &Debug(" Need to manage author permissions...");
1936: &manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
1937: }
1938: }
1939: &Reply($client, $result, $userinput);
1940: }
1941:
1942:
1943: } else {
1944: &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
1945: }
1946: }
1947: return 1;
1948: }
1949: ®ister_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
1950:
1951: #
1952: # Determines if this is the home server for a user. The home server
1953: # for a user will have his/her lon-capa passwd file. Therefore all we need
1954: # to do is determine if this file exists.
1955: #
1956: # Parameters:
1957: # $cmd - The command that got us here.
1958: # $tail - Tail of the command (remaining parameters).
1959: # $client - File descriptor connected to client.
1960: # Returns
1961: # 0 - Requested to exit, caller should shut down.
1962: # 1 - Continue processing.
1963: # Implicit inputs:
1964: # The authentication systems describe above have their own forms of implicit
1965: # input into the authentication process that are described above.
1966: #
1967: sub is_home_handler {
1968: my ($cmd, $tail, $client) = @_;
1969:
1970: my $userinput = "$cmd:$tail";
1971:
1972: my ($udom,$uname)=split(/:/,$tail);
1973: chomp($uname);
1974: my $passfile = &password_filename($udom, $uname);
1975: if($passfile) {
1976: &Reply( $client, "found\n", $userinput);
1977: } else {
1978: &Failure($client, "not_found\n", $userinput);
1979: }
1980: return 1;
1981: }
1982: ®ister_handler("home", \&is_home_handler, 0,1,0);
1983:
1984: #
1985: # Process an update request for a resource?? I think what's going on here is
1986: # that a resource has been modified that we hold a subscription to.
1987: # If the resource is not local, then we must update, or at least invalidate our
1988: # cached copy of the resource.
1989: # FUTURE WORK:
1990: # I need to look at this logic carefully. My druthers would be to follow
1991: # typical caching logic, and simple invalidate the cache, drop any subscription
1992: # an let the next fetch start the ball rolling again... however that may
1993: # actually be more difficult than it looks given the complex web of
1994: # proxy servers.
1995: # Parameters:
1996: # $cmd - The command that got us here.
1997: # $tail - Tail of the command (remaining parameters).
1998: # $client - File descriptor connected to client.
1999: # Returns
2000: # 0 - Requested to exit, caller should shut down.
2001: # 1 - Continue processing.
2002: # Implicit inputs:
2003: # The authentication systems describe above have their own forms of implicit
2004: # input into the authentication process that are described above.
2005: #
2006: sub update_resource_handler {
2007:
2008: my ($cmd, $tail, $client) = @_;
2009:
2010: my $userinput = "$cmd:$tail";
2011:
2012: my $fname= $tail; # This allows interactive testing
2013:
2014:
2015: my $ownership=ishome($fname);
2016: if ($ownership eq 'not_owner') {
2017: if (-e $fname) {
2018: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
2019: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
2020: my $now=time;
2021: my $since=$now-$atime;
2022: if ($since>$perlvar{'lonExpire'}) {
2023: my $reply=&reply("unsub:$fname","$clientname");
2024: &devalidate_meta_cache($fname);
2025: unlink("$fname");
2026: } else {
2027: my $transname="$fname.in.transfer";
2028: my $remoteurl=&reply("sub:$fname","$clientname");
2029: my $response;
2030: alarm(120);
2031: {
2032: my $ua=new LWP::UserAgent;
2033: my $request=new HTTP::Request('GET',"$remoteurl");
2034: $response=$ua->request($request,$transname);
2035: }
2036: alarm(0);
2037: if ($response->is_error()) {
2038: unlink($transname);
2039: my $message=$response->status_line;
2040: &logthis("LWP GET: $message for $fname ($remoteurl)");
2041: } else {
2042: if ($remoteurl!~/\.meta$/) {
2043: alarm(120);
2044: {
2045: my $ua=new LWP::UserAgent;
2046: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
2047: my $mresponse=$ua->request($mrequest,$fname.'.meta');
2048: if ($mresponse->is_error()) {
2049: unlink($fname.'.meta');
2050: }
2051: }
2052: alarm(0);
2053: }
2054: rename($transname,$fname);
2055: &devalidate_meta_cache($fname);
2056: }
2057: }
2058: &Reply( $client, "ok\n", $userinput);
2059: } else {
2060: &Failure($client, "not_found\n", $userinput);
2061: }
2062: } else {
2063: &Failure($client, "rejected\n", $userinput);
2064: }
2065: return 1;
2066: }
2067: ®ister_handler("update", \&update_resource_handler, 0 ,1, 0);
2068:
2069: sub devalidate_meta_cache {
2070: my ($url) = @_;
2071: use Cache::Memcached;
2072: my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
2073: $url = &declutter($url);
2074: $url =~ s-\.meta$--;
2075: my $id = &escape('meta:'.$url);
2076: $memcache->delete($id);
2077: }
2078:
2079: sub declutter {
2080: my $thisfn=shift;
2081: $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//;
2082: $thisfn=~s/^\///;
2083: $thisfn=~s|^adm/wrapper/||;
2084: $thisfn=~s|^adm/coursedocs/showdoc/||;
2085: $thisfn=~s/^res\///;
2086: $thisfn=~s/\?.+$//;
2087: return $thisfn;
2088: }
2089: #
2090: # Fetch a user file from a remote server to the user's home directory
2091: # userfiles subdir.
2092: # Parameters:
2093: # $cmd - The command that got us here.
2094: # $tail - Tail of the command (remaining parameters).
2095: # $client - File descriptor connected to client.
2096: # Returns
2097: # 0 - Requested to exit, caller should shut down.
2098: # 1 - Continue processing.
2099: #
2100: sub fetch_user_file_handler {
2101:
2102: my ($cmd, $tail, $client) = @_;
2103:
2104: my $userinput = "$cmd:$tail";
2105: my $fname = $tail;
2106: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
2107: my $udir=&propath($udom,$uname).'/userfiles';
2108: unless (-e $udir) {
2109: mkdir($udir,0770);
2110: }
2111: Debug("fetch user file for $fname");
2112: if (-e $udir) {
2113: $ufile=~s/^[\.\~]+//;
2114:
2115: # IF necessary, create the path right down to the file.
2116: # Note that any regular files in the way of this path are
2117: # wiped out to deal with some earlier folly of mine.
2118:
2119: if (!&mkpath($udir.'/'.$ufile)) {
2120: &Failure($client, "unable_to_create\n", $userinput);
2121: }
2122:
2123: my $destname=$udir.'/'.$ufile;
2124: my $transname=$udir.'/'.$ufile.'.in.transit';
2125: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
2126: my $response;
2127: Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
2128: alarm(120);
2129: {
2130: my $ua=new LWP::UserAgent;
2131: my $request=new HTTP::Request('GET',"$remoteurl");
2132: $response=$ua->request($request,$transname);
2133: }
2134: alarm(0);
2135: if ($response->is_error()) {
2136: unlink($transname);
2137: my $message=$response->status_line;
2138: &logthis("LWP GET: $message for $fname ($remoteurl)");
2139: &Failure($client, "failed\n", $userinput);
2140: } else {
2141: Debug("Renaming $transname to $destname");
2142: if (!rename($transname,$destname)) {
2143: &logthis("Unable to move $transname to $destname");
2144: unlink($transname);
2145: &Failure($client, "failed\n", $userinput);
2146: } else {
2147: &Reply($client, "ok\n", $userinput);
2148: }
2149: }
2150: } else {
2151: &Failure($client, "not_home\n", $userinput);
2152: }
2153: return 1;
2154: }
2155: ®ister_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
2156:
2157: #
2158: # Remove a file from a user's home directory userfiles subdirectory.
2159: # Parameters:
2160: # cmd - the Lond request keyword that got us here.
2161: # tail - the part of the command past the keyword.
2162: # client- File descriptor connected with the client.
2163: #
2164: # Returns:
2165: # 1 - Continue processing.
2166: sub remove_user_file_handler {
2167: my ($cmd, $tail, $client) = @_;
2168:
2169: my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2170:
2171: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
2172: if ($ufile =~m|/\.\./|) {
2173: # any files paths with /../ in them refuse
2174: # to deal with
2175: &Failure($client, "refused\n", "$cmd:$tail");
2176: } else {
2177: my $udir = &propath($udom,$uname);
2178: if (-e $udir) {
2179: my $file=$udir.'/userfiles/'.$ufile;
2180: if (-e $file) {
2181: #
2182: # If the file is a regular file unlink is fine...
2183: # However it's possible the client wants a dir.
2184: # removed, in which case rmdir is more approprate:
2185: #
2186: if (-f $file){
2187: unlink($file);
2188: } elsif(-d $file) {
2189: rmdir($file);
2190: }
2191: if (-e $file) {
2192: # File is still there after we deleted it ?!?
2193:
2194: &Failure($client, "failed\n", "$cmd:$tail");
2195: } else {
2196: &Reply($client, "ok\n", "$cmd:$tail");
2197: }
2198: } else {
2199: &Failure($client, "not_found\n", "$cmd:$tail");
2200: }
2201: } else {
2202: &Failure($client, "not_home\n", "$cmd:$tail");
2203: }
2204: }
2205: return 1;
2206: }
2207: ®ister_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
2208:
2209: #
2210: # make a directory in a user's home directory userfiles subdirectory.
2211: # Parameters:
2212: # cmd - the Lond request keyword that got us here.
2213: # tail - the part of the command past the keyword.
2214: # client- File descriptor connected with the client.
2215: #
2216: # Returns:
2217: # 1 - Continue processing.
2218: sub mkdir_user_file_handler {
2219: my ($cmd, $tail, $client) = @_;
2220:
2221: my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2222: $dir=&unescape($dir);
2223: my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
2224: if ($ufile =~m|/\.\./|) {
2225: # any files paths with /../ in them refuse
2226: # to deal with
2227: &Failure($client, "refused\n", "$cmd:$tail");
2228: } else {
2229: my $udir = &propath($udom,$uname);
2230: if (-e $udir) {
2231: my $newdir=$udir.'/userfiles/'.$ufile.'/';
2232: if (!&mkpath($newdir)) {
2233: &Failure($client, "failed\n", "$cmd:$tail");
2234: }
2235: &Reply($client, "ok\n", "$cmd:$tail");
2236: } else {
2237: &Failure($client, "not_home\n", "$cmd:$tail");
2238: }
2239: }
2240: return 1;
2241: }
2242: ®ister_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
2243:
2244: #
2245: # rename a file in a user's home directory userfiles subdirectory.
2246: # Parameters:
2247: # cmd - the Lond request keyword that got us here.
2248: # tail - the part of the command past the keyword.
2249: # client- File descriptor connected with the client.
2250: #
2251: # Returns:
2252: # 1 - Continue processing.
2253: sub rename_user_file_handler {
2254: my ($cmd, $tail, $client) = @_;
2255:
2256: my ($udom,$uname,$old,$new) = split(/:/, $tail);
2257: $old=&unescape($old);
2258: $new=&unescape($new);
2259: if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
2260: # any files paths with /../ in them refuse to deal with
2261: &Failure($client, "refused\n", "$cmd:$tail");
2262: } else {
2263: my $udir = &propath($udom,$uname);
2264: if (-e $udir) {
2265: my $oldfile=$udir.'/userfiles/'.$old;
2266: my $newfile=$udir.'/userfiles/'.$new;
2267: if (-e $newfile) {
2268: &Failure($client, "exists\n", "$cmd:$tail");
2269: } elsif (! -e $oldfile) {
2270: &Failure($client, "not_found\n", "$cmd:$tail");
2271: } else {
2272: if (!rename($oldfile,$newfile)) {
2273: &Failure($client, "failed\n", "$cmd:$tail");
2274: } else {
2275: &Reply($client, "ok\n", "$cmd:$tail");
2276: }
2277: }
2278: } else {
2279: &Failure($client, "not_home\n", "$cmd:$tail");
2280: }
2281: }
2282: return 1;
2283: }
2284: ®ister_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
2285:
2286: #
2287: # Authenticate access to a user file by checking that the token the user's
2288: # passed also exists in their session file
2289: #
2290: # Parameters:
2291: # cmd - The request keyword that dispatched to tus.
2292: # tail - The tail of the request (colon separated parameters).
2293: # client - Filehandle open on the client.
2294: # Return:
2295: # 1.
2296: sub token_auth_user_file_handler {
2297: my ($cmd, $tail, $client) = @_;
2298:
2299: my ($fname, $session) = split(/:/, $tail);
2300:
2301: chomp($session);
2302: my $reply="non_auth\n";
2303: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
2304: $session.'.id')) {
2305: while (my $line=<ENVIN>) {
2306: if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply="ok\n"; }
2307: }
2308: close(ENVIN);
2309: &Reply($client, $reply, "$cmd:$tail");
2310: } else {
2311: &Failure($client, "invalid_token\n", "$cmd:$tail");
2312: }
2313: return 1;
2314:
2315: }
2316: ®ister_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
2317:
2318: #
2319: # Unsubscribe from a resource.
2320: #
2321: # Parameters:
2322: # $cmd - The command that got us here.
2323: # $tail - Tail of the command (remaining parameters).
2324: # $client - File descriptor connected to client.
2325: # Returns
2326: # 0 - Requested to exit, caller should shut down.
2327: # 1 - Continue processing.
2328: #
2329: sub unsubscribe_handler {
2330: my ($cmd, $tail, $client) = @_;
2331:
2332: my $userinput= "$cmd:$tail";
2333:
2334: my ($fname) = split(/:/,$tail); # Split in case there's extrs.
2335:
2336: &Debug("Unsubscribing $fname");
2337: if (-e $fname) {
2338: &Debug("Exists");
2339: &Reply($client, &unsub($fname,$clientip), $userinput);
2340: } else {
2341: &Failure($client, "not_found\n", $userinput);
2342: }
2343: return 1;
2344: }
2345: ®ister_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
2346:
2347: # Subscribe to a resource
2348: #
2349: # Parameters:
2350: # $cmd - The command that got us here.
2351: # $tail - Tail of the command (remaining parameters).
2352: # $client - File descriptor connected to client.
2353: # Returns
2354: # 0 - Requested to exit, caller should shut down.
2355: # 1 - Continue processing.
2356: #
2357: sub subscribe_handler {
2358: my ($cmd, $tail, $client)= @_;
2359:
2360: my $userinput = "$cmd:$tail";
2361:
2362: &Reply( $client, &subscribe($userinput,$clientip), $userinput);
2363:
2364: return 1;
2365: }
2366: ®ister_handler("sub", \&subscribe_handler, 0, 1, 0);
2367:
2368: #
2369: # Determine the version of a resource (?) Or is it return
2370: # the top version of the resource? Not yet clear from the
2371: # code in currentversion.
2372: #
2373: # Parameters:
2374: # $cmd - The command that got us here.
2375: # $tail - Tail of the command (remaining parameters).
2376: # $client - File descriptor connected to client.
2377: # Returns
2378: # 0 - Requested to exit, caller should shut down.
2379: # 1 - Continue processing.
2380: #
2381: sub current_version_handler {
2382: my ($cmd, $tail, $client) = @_;
2383:
2384: my $userinput= "$cmd:$tail";
2385:
2386: my $fname = $tail;
2387: &Reply( $client, ¤tversion($fname)."\n", $userinput);
2388: return 1;
2389:
2390: }
2391: ®ister_handler("currentversion", \¤t_version_handler, 0, 1, 0);
2392:
2393: # Make an entry in a user's activity log.
2394: #
2395: # Parameters:
2396: # $cmd - The command that got us here.
2397: # $tail - Tail of the command (remaining parameters).
2398: # $client - File descriptor connected to client.
2399: # Returns
2400: # 0 - Requested to exit, caller should shut down.
2401: # 1 - Continue processing.
2402: #
2403: sub activity_log_handler {
2404: my ($cmd, $tail, $client) = @_;
2405:
2406:
2407: my $userinput= "$cmd:$tail";
2408:
2409: my ($udom,$uname,$what)=split(/:/,$tail);
2410: chomp($what);
2411: my $proname=&propath($udom,$uname);
2412: my $now=time;
2413: my $hfh;
2414: if ($hfh=IO::File->new(">>$proname/activity.log")) {
2415: print $hfh "$now:$clientname:$what\n";
2416: &Reply( $client, "ok\n", $userinput);
2417: } else {
2418: &Failure($client, "error: ".($!+0)." IO::File->new Failed "
2419: ."while attempting log\n",
2420: $userinput);
2421: }
2422:
2423: return 1;
2424: }
2425: ®ister_handler("log", \&activity_log_handler, 0, 1, 0);
2426:
2427: #
2428: # Put a namespace entry in a user profile hash.
2429: # My druthers would be for this to be an encrypted interaction too.
2430: # anything that might be an inadvertent covert channel about either
2431: # user authentication or user personal information....
2432: #
2433: # Parameters:
2434: # $cmd - The command that got us here.
2435: # $tail - Tail of the command (remaining parameters).
2436: # $client - File descriptor connected to client.
2437: # Returns
2438: # 0 - Requested to exit, caller should shut down.
2439: # 1 - Continue processing.
2440: #
2441: sub put_user_profile_entry {
2442: my ($cmd, $tail, $client) = @_;
2443:
2444: my $userinput = "$cmd:$tail";
2445:
2446: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
2447: if ($namespace ne 'roles') {
2448: chomp($what);
2449: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2450: &GDBM_WRCREAT(),"P",$what);
2451: if($hashref) {
2452: my @pairs=split(/\&/,$what);
2453: foreach my $pair (@pairs) {
2454: my ($key,$value)=split(/=/,$pair);
2455: $hashref->{$key}=$value;
2456: }
2457: if (&untie_user_hash($hashref)) {
2458: &Reply( $client, "ok\n", $userinput);
2459: } else {
2460: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2461: "while attempting put\n",
2462: $userinput);
2463: }
2464: } else {
2465: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2466: "while attempting put\n", $userinput);
2467: }
2468: } else {
2469: &Failure( $client, "refused\n", $userinput);
2470: }
2471:
2472: return 1;
2473: }
2474: ®ister_handler("put", \&put_user_profile_entry, 0, 1, 0);
2475:
2476: # Put a piece of new data in hash, returns error if entry already exists
2477: # Parameters:
2478: # $cmd - The command that got us here.
2479: # $tail - Tail of the command (remaining parameters).
2480: # $client - File descriptor connected to client.
2481: # Returns
2482: # 0 - Requested to exit, caller should shut down.
2483: # 1 - Continue processing.
2484: #
2485: sub newput_user_profile_entry {
2486: my ($cmd, $tail, $client) = @_;
2487:
2488: my $userinput = "$cmd:$tail";
2489:
2490: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
2491: if ($namespace eq 'roles') {
2492: &Failure( $client, "refused\n", $userinput);
2493: return 1;
2494: }
2495:
2496: chomp($what);
2497:
2498: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2499: &GDBM_WRCREAT(),"N",$what);
2500: if(!$hashref) {
2501: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2502: "while attempting put\n", $userinput);
2503: return 1;
2504: }
2505:
2506: my @pairs=split(/\&/,$what);
2507: foreach my $pair (@pairs) {
2508: my ($key,$value)=split(/=/,$pair);
2509: if (exists($hashref->{$key})) {
2510: &Failure($client, "key_exists: ".$key."\n",$userinput);
2511: return 1;
2512: }
2513: }
2514:
2515: foreach my $pair (@pairs) {
2516: my ($key,$value)=split(/=/,$pair);
2517: $hashref->{$key}=$value;
2518: }
2519:
2520: if (&untie_user_hash($hashref)) {
2521: &Reply( $client, "ok\n", $userinput);
2522: } else {
2523: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2524: "while attempting put\n",
2525: $userinput);
2526: }
2527: return 1;
2528: }
2529: ®ister_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
2530:
2531: #
2532: # Increment a profile entry in the user history file.
2533: # The history contains keyword value pairs. In this case,
2534: # The value itself is a pair of numbers. The first, the current value
2535: # the second an increment that this function applies to the current
2536: # value.
2537: #
2538: # Parameters:
2539: # $cmd - The command that got us here.
2540: # $tail - Tail of the command (remaining parameters).
2541: # $client - File descriptor connected to client.
2542: # Returns
2543: # 0 - Requested to exit, caller should shut down.
2544: # 1 - Continue processing.
2545: #
2546: sub increment_user_value_handler {
2547: my ($cmd, $tail, $client) = @_;
2548:
2549: my $userinput = "$cmd:$tail";
2550:
2551: my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
2552: if ($namespace ne 'roles') {
2553: chomp($what);
2554: my $hashref = &tie_user_hash($udom, $uname,
2555: $namespace, &GDBM_WRCREAT(),
2556: "P",$what);
2557: if ($hashref) {
2558: my @pairs=split(/\&/,$what);
2559: foreach my $pair (@pairs) {
2560: my ($key,$value)=split(/=/,$pair);
2561: $value = &unescape($value);
2562: # We could check that we have a number...
2563: if (! defined($value) || $value eq '') {
2564: $value = 1;
2565: }
2566: $hashref->{$key}+=$value;
2567: if ($namespace eq 'nohist_resourcetracker') {
2568: if ($hashref->{$key} < 0) {
2569: $hashref->{$key} = 0;
2570: }
2571: }
2572: }
2573: if (&untie_user_hash($hashref)) {
2574: &Reply( $client, "ok\n", $userinput);
2575: } else {
2576: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2577: "while attempting inc\n", $userinput);
2578: }
2579: } else {
2580: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2581: "while attempting inc\n", $userinput);
2582: }
2583: } else {
2584: &Failure($client, "refused\n", $userinput);
2585: }
2586:
2587: return 1;
2588: }
2589: ®ister_handler("inc", \&increment_user_value_handler, 0, 1, 0);
2590:
2591: #
2592: # Put a new role for a user. Roles are LonCAPA's packaging of permissions.
2593: # Each 'role' a user has implies a set of permissions. Adding a new role
2594: # for a person grants the permissions packaged with that role
2595: # to that user when the role is selected.
2596: #
2597: # Parameters:
2598: # $cmd - The command string (rolesput).
2599: # $tail - The remainder of the request line. For rolesput this
2600: # consists of a colon separated list that contains:
2601: # The domain and user that is granting the role (logged).
2602: # The domain and user that is getting the role.
2603: # The roles being granted as a set of & separated pairs.
2604: # each pair a key value pair.
2605: # $client - File descriptor connected to the client.
2606: # Returns:
2607: # 0 - If the daemon should exit
2608: # 1 - To continue processing.
2609: #
2610: #
2611: sub roles_put_handler {
2612: my ($cmd, $tail, $client) = @_;
2613:
2614: my $userinput = "$cmd:$tail";
2615:
2616: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail);
2617:
2618:
2619: my $namespace='roles';
2620: chomp($what);
2621: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2622: &GDBM_WRCREAT(), "P",
2623: "$exedom:$exeuser:$what");
2624: #
2625: # Log the attempt to set a role. The {}'s here ensure that the file
2626: # handle is open for the minimal amount of time. Since the flush
2627: # is done on close this improves the chances the log will be an un-
2628: # corrupted ordered thing.
2629: if ($hashref) {
2630: my $pass_entry = &get_auth_type($udom, $uname);
2631: my ($auth_type,$pwd) = split(/:/, $pass_entry);
2632: $auth_type = $auth_type.":";
2633: my @pairs=split(/\&/,$what);
2634: foreach my $pair (@pairs) {
2635: my ($key,$value)=split(/=/,$pair);
2636: &manage_permissions($key, $udom, $uname,
2637: $auth_type);
2638: $hashref->{$key}=$value;
2639: }
2640: if (&untie_user_hash($hashref)) {
2641: &Reply($client, "ok\n", $userinput);
2642: } else {
2643: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2644: "while attempting rolesput\n", $userinput);
2645: }
2646: } else {
2647: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2648: "while attempting rolesput\n", $userinput);
2649: }
2650: return 1;
2651: }
2652: ®ister_handler("rolesput", \&roles_put_handler, 1,1,0); # Encoded client only.
2653:
2654: #
2655: # Deletes (removes) a role for a user. This is equivalent to removing
2656: # a permissions package associated with the role from the user's profile.
2657: #
2658: # Parameters:
2659: # $cmd - The command (rolesdel)
2660: # $tail - The remainder of the request line. This consists
2661: # of:
2662: # The domain and user requesting the change (logged)
2663: # The domain and user being changed.
2664: # The roles being revoked. These are shipped to us
2665: # as a bunch of & separated role name keywords.
2666: # $client - The file handle open on the client.
2667: # Returns:
2668: # 1 - Continue processing
2669: # 0 - Exit.
2670: #
2671: sub roles_delete_handler {
2672: my ($cmd, $tail, $client) = @_;
2673:
2674: my $userinput = "$cmd:$tail";
2675:
2676: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
2677: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
2678: "what = ".$what);
2679: my $namespace='roles';
2680: chomp($what);
2681: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2682: &GDBM_WRCREAT(), "D",
2683: "$exedom:$exeuser:$what");
2684:
2685: if ($hashref) {
2686: my @rolekeys=split(/\&/,$what);
2687:
2688: foreach my $key (@rolekeys) {
2689: delete $hashref->{$key};
2690: }
2691: if (&untie_user_hash($hashref)) {
2692: &Reply($client, "ok\n", $userinput);
2693: } else {
2694: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2695: "while attempting rolesdel\n", $userinput);
2696: }
2697: } else {
2698: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2699: "while attempting rolesdel\n", $userinput);
2700: }
2701:
2702: return 1;
2703: }
2704: ®ister_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
2705:
2706: # Unencrypted get from a user's profile database. See
2707: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
2708: # This function retrieves a keyed item from a specific named database in the
2709: # user's directory.
2710: #
2711: # Parameters:
2712: # $cmd - Command request keyword (get).
2713: # $tail - Tail of the command. This is a colon separated list
2714: # consisting of the domain and username that uniquely
2715: # identifies the profile,
2716: # The 'namespace' which selects the gdbm file to
2717: # do the lookup in,
2718: # & separated list of keys to lookup. Note that
2719: # the values are returned as an & separated list too.
2720: # $client - File descriptor open on the client.
2721: # Returns:
2722: # 1 - Continue processing.
2723: # 0 - Exit.
2724: #
2725: sub get_profile_entry {
2726: my ($cmd, $tail, $client) = @_;
2727:
2728: my $userinput= "$cmd:$tail";
2729:
2730: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2731: chomp($what);
2732:
2733: my $replystring = read_profile($udom, $uname, $namespace, $what);
2734: my ($first) = split(/:/,$replystring);
2735: if($first ne "error") {
2736: &Reply($client, "$replystring\n", $userinput);
2737: } else {
2738: &Failure($client, $replystring." while attempting get\n", $userinput);
2739: }
2740: return 1;
2741:
2742:
2743: }
2744: ®ister_handler("get", \&get_profile_entry, 0,1,0);
2745:
2746: #
2747: # Process the encrypted get request. Note that the request is sent
2748: # in clear, but the reply is encrypted. This is a small covert channel:
2749: # information about the sensitive keys is given to the snooper. Just not
2750: # information about the values of the sensitive key. Hmm if I wanted to
2751: # know these I'd snoop for the egets. Get the profile item names from them
2752: # and then issue a get for them since there's no enforcement of the
2753: # requirement of an encrypted get for particular profile items. If I
2754: # were re-doing this, I'd force the request to be encrypted as well as the
2755: # reply. I'd also just enforce encrypted transactions for all gets since
2756: # that would prevent any covert channel snooping.
2757: #
2758: # Parameters:
2759: # $cmd - Command keyword of request (eget).
2760: # $tail - Tail of the command. See GetProfileEntry
# for more information about this.
2761: # $client - File open on the client.
2762: # Returns:
2763: # 1 - Continue processing
2764: # 0 - server should exit.
2765: sub get_profile_entry_encrypted {
2766: my ($cmd, $tail, $client) = @_;
2767:
2768: my $userinput = "$cmd:$tail";
2769:
2770: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
2771: chomp($what);
2772: my $qresult = read_profile($udom, $uname, $namespace, $what);
2773: my ($first) = split(/:/, $qresult);
2774: if($first ne "error") {
2775:
2776: if ($cipher) {
2777: my $cmdlength=length($qresult);
2778: $qresult.=" ";
2779: my $encqresult='';
2780: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
2781: $encqresult.= unpack("H16",
2782: $cipher->encrypt(substr($qresult,
2783: $encidx,
2784: 8)));
2785: }
2786: &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
2787: } else {
2788: &Failure( $client, "error:no_key\n", $userinput);
2789: }
2790: } else {
2791: &Failure($client, "$qresult while attempting eget\n", $userinput);
2792:
2793: }
2794:
2795: return 1;
2796: }
2797: ®ister_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
2798:
2799: #
2800: # Deletes a key in a user profile database.
2801: #
2802: # Parameters:
2803: # $cmd - Command keyword (del).
2804: # $tail - Command tail. IN this case a colon
2805: # separated list containing:
2806: # The domain and user that identifies uniquely
2807: # the identity of the user.
2808: # The profile namespace (name of the profile
2809: # database file).
2810: # & separated list of keywords to delete.
2811: # $client - File open on client socket.
2812: # Returns:
2813: # 1 - Continue processing
2814: # 0 - Exit server.
2815: #
2816: #
2817: sub delete_profile_entry {
2818: my ($cmd, $tail, $client) = @_;
2819:
2820: my $userinput = "cmd:$tail";
2821:
2822: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2823: chomp($what);
2824: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2825: &GDBM_WRCREAT(),
2826: "D",$what);
2827: if ($hashref) {
2828: my @keys=split(/\&/,$what);
2829: foreach my $key (@keys) {
2830: delete($hashref->{$key});
2831: }
2832: if (&untie_user_hash($hashref)) {
2833: &Reply($client, "ok\n", $userinput);
2834: } else {
2835: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2836: "while attempting del\n", $userinput);
2837: }
2838: } else {
2839: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2840: "while attempting del\n", $userinput);
2841: }
2842: return 1;
2843: }
2844: ®ister_handler("del", \&delete_profile_entry, 0, 1, 0);
2845:
2846: #
2847: # List the set of keys that are defined in a profile database file.
2848: # A successful reply from this will contain an & separated list of
2849: # the keys.
2850: # Parameters:
2851: # $cmd - Command request (keys).
2852: # $tail - Remainder of the request, a colon separated
2853: # list containing domain/user that identifies the
2854: # user being queried, and the database namespace
2855: # (database filename essentially).
2856: # $client - File open on the client.
2857: # Returns:
2858: # 1 - Continue processing.
2859: # 0 - Exit the server.
2860: #
2861: sub get_profile_keys {
2862: my ($cmd, $tail, $client) = @_;
2863:
2864: my $userinput = "$cmd:$tail";
2865:
2866: my ($udom,$uname,$namespace)=split(/:/,$tail);
2867: my $qresult='';
2868: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2869: &GDBM_READER());
2870: if ($hashref) {
2871: foreach my $key (keys %$hashref) {
2872: $qresult.="$key&";
2873: }
2874: if (&untie_user_hash($hashref)) {
2875: $qresult=~s/\&$//;
2876: &Reply($client, "$qresult\n", $userinput);
2877: } else {
2878: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2879: "while attempting keys\n", $userinput);
2880: }
2881: } else {
2882: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2883: "while attempting keys\n", $userinput);
2884: }
2885:
2886: return 1;
2887: }
2888: ®ister_handler("keys", \&get_profile_keys, 0, 1, 0);
2889:
2890: #
2891: # Dump the contents of a user profile database.
2892: # Note that this constitutes a very large covert channel too since
2893: # the dump will return sensitive information that is not encrypted.
2894: # The naive security assumption is that the session negotiation ensures
2895: # our client is trusted and I don't believe that's assured at present.
2896: # Sure want badly to go to ssl or tls. Of course if my peer isn't really
2897: # a LonCAPA node they could have negotiated an encryption key too so >sigh<.
2898: #
2899: # Parameters:
2900: # $cmd - The command request keyword (currentdump).
2901: # $tail - Remainder of the request, consisting of a colon
2902: # separated list that has the domain/username and
2903: # the namespace to dump (database file).
2904: # $client - file open on the remote client.
2905: # Returns:
2906: # 1 - Continue processing.
2907: # 0 - Exit the server.
2908: #
2909: sub dump_profile_database {
2910: my ($cmd, $tail, $client) = @_;
2911:
2912: my $userinput = "$cmd:$tail";
2913:
2914: my ($udom,$uname,$namespace) = split(/:/,$tail);
2915: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2916: &GDBM_READER());
2917: if ($hashref) {
2918: # Structure of %data:
2919: # $data{$symb}->{$parameter}=$value;
2920: # $data{$symb}->{'v.'.$parameter}=$version;
2921: # since $parameter will be unescaped, we do not
2922: # have to worry about silly parameter names...
2923:
2924: my $qresult='';
2925: my %data = (); # A hash of anonymous hashes..
2926: while (my ($key,$value) = each(%$hashref)) {
2927: my ($v,$symb,$param) = split(/:/,$key);
2928: next if ($v eq 'version' || $symb eq 'keys');
2929: next if (exists($data{$symb}) &&
2930: exists($data{$symb}->{$param}) &&
2931: $data{$symb}->{'v.'.$param} > $v);
2932: $data{$symb}->{$param}=$value;
2933: $data{$symb}->{'v.'.$param}=$v;
2934: }
2935: if (&untie_user_hash($hashref)) {
2936: while (my ($symb,$param_hash) = each(%data)) {
2937: while(my ($param,$value) = each (%$param_hash)){
2938: next if ($param =~ /^v\./); # Ignore versions...
2939: #
2940: # Just dump the symb=value pairs separated by &
2941: #
2942: $qresult.=$symb.':'.$param.'='.$value.'&';
2943: }
2944: }
2945: chop($qresult);
2946: &Reply($client , "$qresult\n", $userinput);
2947: } else {
2948: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2949: "while attempting currentdump\n", $userinput);
2950: }
2951: } else {
2952: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2953: "while attempting currentdump\n", $userinput);
2954: }
2955:
2956: return 1;
2957: }
2958: ®ister_handler("currentdump", \&dump_profile_database, 0, 1, 0);
2959:
2960: #
2961: # Dump a profile database with an optional regular expression
2962: # to match against the keys. In this dump, no effort is made
2963: # to separate symb from version information. Presumably the
2964: # databases that are dumped by this command are of a different
2965: # structure. Need to look at this and improve the documentation of
2966: # both this and the currentdump handler.
2967: # Parameters:
2968: # $cmd - The command keyword.
2969: # $tail - All of the characters after the $cmd:
2970: # These are expected to be a colon
2971: # separated list containing:
2972: # domain/user - identifying the user.
2973: # namespace - identifying the database.
2974: # regexp - optional regular expression
2975: # that is matched against
2976: # database keywords to do
2977: # selective dumps.
2978: # $client - Channel open on the client.
2979: # Returns:
2980: # 1 - Continue processing.
2981: # Side effects:
2982: # response is written to $client.
2983: #
2984: sub dump_with_regexp {
2985: my ($cmd, $tail, $client) = @_;
2986:
2987:
2988: my $userinput = "$cmd:$tail";
2989:
2990: my ($udom,$uname,$namespace,$regexp,$range)=split(/:/,$tail);
2991: if (defined($regexp)) {
2992: $regexp=&unescape($regexp);
2993: } else {
2994: $regexp='.';
2995: }
2996: my ($start,$end);
2997: if (defined($range)) {
2998: if ($range =~/^(\d+)\-(\d+)$/) {
2999: ($start,$end) = ($1,$2);
3000: } elsif ($range =~/^(\d+)$/) {
3001: ($start,$end) = (0,$1);
3002: } else {
3003: undef($range);
3004: }
3005: }
3006: my $hashref = &tie_user_hash($udom, $uname, $namespace,
3007: &GDBM_READER());
3008: if ($hashref) {
3009: my $qresult='';
3010: my $count=0;
3011: while (my ($key,$value) = each(%$hashref)) {
3012: if ($regexp eq '.') {
3013: $count++;
3014: if (defined($range) && $count >= $end) { last; }
3015: if (defined($range) && $count < $start) { next; }
3016: $qresult.=$key.'='.$value.'&';
3017: } else {
3018: my $unescapeKey = &unescape($key);
3019: if (eval('$unescapeKey=~/$regexp/')) {
3020: $count++;
3021: if (defined($range) && $count >= $end) { last; }
3022: if (defined($range) && $count < $start) { next; }
3023: $qresult.="$key=$value&";
3024: }
3025: }
3026: }
3027: if (&untie_user_hash($hashref)) {
3028: chop($qresult);
3029: &Reply($client, "$qresult\n", $userinput);
3030: } else {
3031: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
3032: "while attempting dump\n", $userinput);
3033: }
3034: } else {
3035: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3036: "while attempting dump\n", $userinput);
3037: }
3038:
3039: return 1;
3040: }
3041: ®ister_handler("dump", \&dump_with_regexp, 0, 1, 0);
3042:
3043: # Store a set of key=value pairs associated with a versioned name.
3044: #
3045: # Parameters:
3046: # $cmd - Request command keyword.
3047: # $tail - Tail of the request. This is a colon
3048: # separated list containing:
3049: # domain/user - User and authentication domain.
3050: # namespace - Name of the database being modified
3051: # rid - Resource keyword to modify.
3052: # what - new value associated with rid.
3053: #
3054: # $client - Socket open on the client.
3055: #
3056: #
3057: # Returns:
3058: # 1 (keep on processing).
3059: # Side-Effects:
3060: # Writes to the client
3061: sub store_handler {
3062: my ($cmd, $tail, $client) = @_;
3063:
3064: my $userinput = "$cmd:$tail";
3065:
3066: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
3067: if ($namespace ne 'roles') {
3068:
3069: chomp($what);
3070: my @pairs=split(/\&/,$what);
3071: my $hashref = &tie_user_hash($udom, $uname, $namespace,
3072: &GDBM_WRCREAT(), "S",
3073: "$rid:$what");
3074: if ($hashref) {
3075: my $now = time;
3076: my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
3077: my $key;
3078: $hashref->{"version:$rid"}++;
3079: my $version=$hashref->{"version:$rid"};
3080: my $allkeys='';
3081: foreach my $pair (@pairs) {
3082: my ($key,$value)=split(/=/,$pair);
3083: $allkeys.=$key.':';
3084: $hashref->{"$version:$rid:$key"}=$value;
3085: }
3086: $hashref->{"$version:$rid:timestamp"}=$now;
3087: $allkeys.='timestamp';
3088: $hashref->{"$version:keys:$rid"}=$allkeys;
3089: if (&untie_user_hash($hashref)) {
3090: &Reply($client, "ok\n", $userinput);
3091: } else {
3092: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3093: "while attempting store\n", $userinput);
3094: }
3095: } else {
3096: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3097: "while attempting store\n", $userinput);
3098: }
3099: } else {
3100: &Failure($client, "refused\n", $userinput);
3101: }
3102:
3103: return 1;
3104: }
3105: ®ister_handler("store", \&store_handler, 0, 1, 0);
3106:
3107: # Modify a set of key=value pairs associated with a versioned name.
3108: #
3109: # Parameters:
3110: # $cmd - Request command keyword.
3111: # $tail - Tail of the request. This is a colon
3112: # separated list containing:
3113: # domain/user - User and authentication domain.
3114: # namespace - Name of the database being modified
3115: # rid - Resource keyword to modify.
3116: # v - Version item to modify
3117: # what - new value associated with rid.
3118: #
3119: # $client - Socket open on the client.
3120: #
3121: #
3122: # Returns:
3123: # 1 (keep on processing).
3124: # Side-Effects:
3125: # Writes to the client
3126: sub putstore_handler {
3127: my ($cmd, $tail, $client) = @_;
3128:
3129: my $userinput = "$cmd:$tail";
3130:
3131: my ($udom,$uname,$namespace,$rid,$v,$what) =split(/:/,$tail);
3132: if ($namespace ne 'roles') {
3133:
3134: chomp($what);
3135: my $hashref = &tie_user_hash($udom, $uname, $namespace,
3136: &GDBM_WRCREAT(), "M",
3137: "$rid:$v:$what");
3138: if ($hashref) {
3139: my $now = time;
3140: my %data = &hash_extract($what);
3141: my @allkeys;
3142: while (my($key,$value) = each(%data)) {
3143: push(@allkeys,$key);
3144: $hashref->{"$v:$rid:$key"} = $value;
3145: }
3146: my $allkeys = join(':',@allkeys);
3147: $hashref->{"$v:keys:$rid"}=$allkeys;
3148:
3149: if (&untie_user_hash($hashref)) {
3150: &Reply($client, "ok\n", $userinput);
3151: } else {
3152: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3153: "while attempting store\n", $userinput);
3154: }
3155: } else {
3156: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3157: "while attempting store\n", $userinput);
3158: }
3159: } else {
3160: &Failure($client, "refused\n", $userinput);
3161: }
3162:
3163: return 1;
3164: }
3165: ®ister_handler("putstore", \&putstore_handler, 0, 1, 0);
3166:
3167: sub hash_extract {
3168: my ($str)=@_;
3169: my %hash;
3170: foreach my $pair (split(/\&/,$str)) {
3171: my ($key,$value)=split(/=/,$pair);
3172: $hash{$key}=$value;
3173: }
3174: return (%hash);
3175: }
3176: sub hash_to_str {
3177: my ($hash_ref)=@_;
3178: my $str;
3179: foreach my $key (keys(%$hash_ref)) {
3180: $str.=$key.'='.$hash_ref->{$key}.'&';
3181: }
3182: $str=~s/\&$//;
3183: return $str;
3184: }
3185:
3186: #
3187: # Dump out all versions of a resource that has key=value pairs associated
3188: # with it for each version. These resources are built up via the store
3189: # command.
3190: #
3191: # Parameters:
3192: # $cmd - Command keyword.
3193: # $tail - Remainder of the request which consists of:
3194: # domain/user - User and auth. domain.
3195: # namespace - name of resource database.
3196: # rid - Resource id.
3197: # $client - socket open on the client.
3198: #
3199: # Returns:
3200: # 1 indicating the caller should not yet exit.
3201: # Side-effects:
3202: # Writes a reply to the client.
3203: # The reply is a string of the following shape:
3204: # version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
3205: # Where the 1 above represents version 1.
3206: # this continues for all pairs of keys in all versions.
3207: #
3208: #
3209: #
3210: #
3211: sub restore_handler {
3212: my ($cmd, $tail, $client) = @_;
3213:
3214: my $userinput = "$cmd:$tail"; # Only used for logging purposes.
3215:
3216: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
3217: $namespace=~s/\//\_/g;
3218: $namespace=~s/\W//g;
3219: chomp($rid);
3220: my $qresult='';
3221: my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER());
3222: if ($hashref) {
3223: my $version=$hashref->{"version:$rid"};
3224: $qresult.="version=$version&";
3225: my $scope;
3226: for ($scope=1;$scope<=$version;$scope++) {
3227: my $vkeys=$hashref->{"$scope:keys:$rid"};
3228: my @keys=split(/:/,$vkeys);
3229: my $key;
3230: $qresult.="$scope:keys=$vkeys&";
3231: foreach $key (@keys) {
3232: $qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&";
3233: }
3234: }
3235: if (&untie_user_hash($hashref)) {
3236: $qresult=~s/\&$//;
3237: &Reply( $client, "$qresult\n", $userinput);
3238: } else {
3239: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3240: "while attempting restore\n", $userinput);
3241: }
3242: } else {
3243: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3244: "while attempting restore\n", $userinput);
3245: }
3246:
3247: return 1;
3248:
3249:
3250: }
3251: ®ister_handler("restore", \&restore_handler, 0,1,0);
3252:
3253: #
3254: # Add a chat message to a synchronous discussion board.
3255: #
3256: # Parameters:
3257: # $cmd - Request keyword.
3258: # $tail - Tail of the command. A colon separated list
3259: # containing:
3260: # cdom - Domain on which the chat board lives
3261: # cnum - Course containing the chat board.
3262: # newpost - Body of the posting.
3263: # group - Optional group, if chat board is only
3264: # accessible in a group within the course
3265: # $client - Socket open on the client.
3266: # Returns:
3267: # 1 - Indicating caller should keep on processing.
3268: #
3269: # Side-effects:
3270: # writes a reply to the client.
3271: #
3272: #
3273: sub send_chat_handler {
3274: my ($cmd, $tail, $client) = @_;
3275:
3276:
3277: my $userinput = "$cmd:$tail";
3278:
3279: my ($cdom,$cnum,$newpost,$group)=split(/\:/,$tail);
3280: &chat_add($cdom,$cnum,$newpost,$group);
3281: &Reply($client, "ok\n", $userinput);
3282:
3283: return 1;
3284: }
3285: ®ister_handler("chatsend", \&send_chat_handler, 0, 1, 0);
3286:
3287: #
3288: # Retrieve the set of chat messages from a discussion board.
3289: #
3290: # Parameters:
3291: # $cmd - Command keyword that initiated the request.
3292: # $tail - Remainder of the request after the command
3293: # keyword. In this case a colon separated list of
3294: # chat domain - Which discussion board.
3295: # chat id - Discussion thread(?)
3296: # domain/user - Authentication domain and username
3297: # of the requesting person.
3298: # group - Optional course group containing
3299: # the board.
3300: # $client - Socket open on the client program.
3301: # Returns:
3302: # 1 - continue processing
3303: # Side effects:
3304: # Response is written to the client.
3305: #
3306: sub retrieve_chat_handler {
3307: my ($cmd, $tail, $client) = @_;
3308:
3309:
3310: my $userinput = "$cmd:$tail";
3311:
3312: my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail);
3313: my $reply='';
3314: foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) {
3315: $reply.=&escape($_).':';
3316: }
3317: $reply=~s/\:$//;
3318: &Reply($client, $reply."\n", $userinput);
3319:
3320:
3321: return 1;
3322: }
3323: ®ister_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
3324:
3325: #
3326: # Initiate a query of an sql database. SQL query repsonses get put in
3327: # a file for later retrieval. This prevents sql query results from
3328: # bottlenecking the system. Note that with loncnew, perhaps this is
3329: # less of an issue since multiple outstanding requests can be concurrently
3330: # serviced.
3331: #
3332: # Parameters:
3333: # $cmd - COmmand keyword that initiated the request.
3334: # $tail - Remainder of the command after the keyword.
3335: # For this function, this consists of a query and
3336: # 3 arguments that are self-documentingly labelled
3337: # in the original arg1, arg2, arg3.
3338: # $client - Socket open on the client.
3339: # Return:
3340: # 1 - Indicating processing should continue.
3341: # Side-effects:
3342: # a reply is written to $client.
3343: #
3344: sub send_query_handler {
3345: my ($cmd, $tail, $client) = @_;
3346:
3347:
3348: my $userinput = "$cmd:$tail";
3349:
3350: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
3351: $query=~s/\n*$//g;
3352: &Reply($client, "". &sql_reply("$clientname\&$query".
3353: "\&$arg1"."\&$arg2"."\&$arg3")."\n",
3354: $userinput);
3355:
3356: return 1;
3357: }
3358: ®ister_handler("querysend", \&send_query_handler, 0, 1, 0);
3359:
3360: #
3361: # Add a reply to an sql query. SQL queries are done asyncrhonously.
3362: # The query is submitted via a "querysend" transaction.
3363: # There it is passed on to the lonsql daemon, queued and issued to
3364: # mysql.
3365: # This transaction is invoked when the sql transaction is complete
3366: # it stores the query results in flie and indicates query completion.
3367: # presumably local software then fetches this response... I'm guessing
3368: # the sequence is: lonc does a querysend, we ask lonsql to do it.
3369: # lonsql on completion of the query interacts with the lond of our
3370: # client to do a query reply storing two files:
3371: # - id - The results of the query.
3372: # - id.end - Indicating the transaction completed.
3373: # NOTE: id is a unique id assigned to the query and querysend time.
3374: # Parameters:
3375: # $cmd - Command keyword that initiated this request.
3376: # $tail - Remainder of the tail. In this case that's a colon
3377: # separated list containing the query Id and the
3378: # results of the query.
3379: # $client - Socket open on the client.
3380: # Return:
3381: # 1 - Indicating that we should continue processing.
3382: # Side effects:
3383: # ok written to the client.
3384: #
3385: sub reply_query_handler {
3386: my ($cmd, $tail, $client) = @_;
3387:
3388:
3389: my $userinput = "$cmd:$tail";
3390:
3391: my ($cmd,$id,$reply)=split(/:/,$userinput);
3392: my $store;
3393: my $execdir=$perlvar{'lonDaemons'};
3394: if ($store=IO::File->new(">$execdir/tmp/$id")) {
3395: $reply=~s/\&/\n/g;
3396: print $store $reply;
3397: close $store;
3398: my $store2=IO::File->new(">$execdir/tmp/$id.end");
3399: print $store2 "done\n";
3400: close $store2;
3401: &Reply($client, "ok\n", $userinput);
3402: } else {
3403: &Failure($client, "error: ".($!+0)
3404: ." IO::File->new Failed ".
3405: "while attempting queryreply\n", $userinput);
3406: }
3407:
3408:
3409: return 1;
3410: }
3411: ®ister_handler("queryreply", \&reply_query_handler, 0, 1, 0);
3412:
3413: #
3414: # Process the courseidput request. Not quite sure what this means
3415: # at the system level sense. It appears a gdbm file in the
3416: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and
3417: # a set of entries made in that database.
3418: #
3419: # Parameters:
3420: # $cmd - The command keyword that initiated this request.
3421: # $tail - Tail of the command. In this case consists of a colon
3422: # separated list contaning the domain to apply this to and
3423: # an ampersand separated list of keyword=value pairs.
3424: # Each value is a colon separated list that includes:
3425: # description, institutional code and course owner.
3426: # For backward compatibility with versions included
3427: # in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
3428: # code and/or course owner are preserved from the existing
3429: # record when writing a new record in response to 1.1 or
3430: # 1.2 implementations of lonnet::flushcourselogs().
3431: #
3432: # $client - Socket open on the client.
3433: # Returns:
3434: # 1 - indicating that processing should continue
3435: #
3436: # Side effects:
3437: # reply is written to the client.
3438: #
3439: sub put_course_id_handler {
3440: my ($cmd, $tail, $client) = @_;
3441:
3442:
3443: my $userinput = "$cmd:$tail";
3444:
3445: my ($udom, $what) = split(/:/, $tail,2);
3446: chomp($what);
3447: my $now=time;
3448: my @pairs=split(/\&/,$what);
3449:
3450: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3451: if ($hashref) {
3452: foreach my $pair (@pairs) {
3453: my ($key,$courseinfo) = split(/=/,$pair,2);
3454: $courseinfo =~ s/=/:/g;
3455:
3456: my @current_items = split(/:/,$hashref->{$key});
3457: shift(@current_items); # remove description
3458: pop(@current_items); # remove last access
3459: my $numcurrent = scalar(@current_items);
3460:
3461: my @new_items = split(/:/,$courseinfo);
3462: my $numnew = scalar(@new_items);
3463: if ($numcurrent > 0) {
3464: if ($numnew == 1) { # flushcourselogs() from 1.1 or earlier
3465: $courseinfo .= ':'.join(':',@current_items);
3466: } elsif ($numnew == 2) { # flushcourselogs() from 1.2.X
3467: $courseinfo .= ':'.$current_items[$numcurrent-1];
3468: }
3469: }
3470: $hashref->{$key}=$courseinfo.':'.$now;
3471: }
3472: if (&untie_domain_hash($hashref)) {
3473: &Reply( $client, "ok\n", $userinput);
3474: } else {
3475: &Failure($client, "error: ".($!+0)
3476: ." untie(GDBM) Failed ".
3477: "while attempting courseidput\n", $userinput);
3478: }
3479: } else {
3480: &Failure($client, "error: ".($!+0)
3481: ." tie(GDBM) Failed ".
3482: "while attempting courseidput\n", $userinput);
3483: }
3484:
3485:
3486: return 1;
3487: }
3488: ®ister_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
3489:
3490: # Retrieves the value of a course id resource keyword pattern
3491: # defined since a starting date. Both the starting date and the
3492: # keyword pattern are optional. If the starting date is not supplied it
3493: # is treated as the beginning of time. If the pattern is not found,
3494: # it is treatred as "." matching everything.
3495: #
3496: # Parameters:
3497: # $cmd - Command keyword that resulted in us being dispatched.
3498: # $tail - The remainder of the command that, in this case, consists
3499: # of a colon separated list of:
3500: # domain - The domain in which the course database is
3501: # defined.
3502: # since - Optional parameter describing the minimum
3503: # time of definition(?) of the resources that
3504: # will match the dump.
3505: # description - regular expression that is used to filter
3506: # the dump. Only keywords matching this regexp
3507: # will be used.
3508: # institutional code - optional supplied code to filter
3509: # the dump. Only courses with an institutional code
3510: # that match the supplied code will be returned.
3511: # owner - optional supplied username of owner to filter
3512: # the dump. Only courses for which the course
3513: # owner matches the supplied username will be
3514: # returned. Implicit assumption that owner
3515: # is a user in the domain in which the
3516: # course database is defined.
3517: # $client - The socket open on the client.
3518: # Returns:
3519: # 1 - Continue processing.
3520: # Side Effects:
3521: # a reply is written to $client.
3522: sub dump_course_id_handler {
3523: my ($cmd, $tail, $client) = @_;
3524:
3525: my $userinput = "$cmd:$tail";
3526:
3527: my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter) =split(/:/,$tail);
3528: if (defined($description)) {
3529: $description=&unescape($description);
3530: } else {
3531: $description='.';
3532: }
3533: if (defined($instcodefilter)) {
3534: $instcodefilter=&unescape($instcodefilter);
3535: } else {
3536: $instcodefilter='.';
3537: }
3538: if (defined($ownerfilter)) {
3539: $ownerfilter=&unescape($ownerfilter);
3540: } else {
3541: $ownerfilter='.';
3542: }
3543: if (defined($coursefilter)) {
3544: $coursefilter=&unescape($coursefilter);
3545: } else {
3546: $coursefilter='.';
3547: }
3548:
3549: unless (defined($since)) { $since=0; }
3550: my $qresult='';
3551: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3552: if ($hashref) {
3553: while (my ($key,$value) = each(%$hashref)) {
3554: my ($descr,$lasttime,$inst_code,$owner);
3555: my @courseitems = split(/:/,$value);
3556: $lasttime = pop(@courseitems);
3557: ($descr,$inst_code,$owner)=@courseitems;
3558: if ($lasttime<$since) { next; }
3559: my $match = 1;
3560: unless ($description eq '.') {
3561: my $unescapeDescr = &unescape($descr);
3562: unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
3563: $match = 0;
3564: }
3565: }
3566: unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
3567: my $unescapeInstcode = &unescape($inst_code);
3568: unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) {
3569: $match = 0;
3570: }
3571: }
3572: unless ($ownerfilter eq '.' || !defined($ownerfilter)) {
3573: my $unescapeOwner = &unescape($owner);
3574: unless (eval('$unescapeOwner=~/\Q$ownerfilter\E/i')) {
3575: $match = 0;
3576: }
3577: }
3578: unless ($coursefilter eq '.' || !defined($coursefilter)) {
3579: my $unescapeCourse = &unescape($key);
3580: unless (eval('$unescapeCourse=~/^$udom(_)\Q$coursefilter\E$/')) {
3581: $match = 0;
3582: }
3583: }
3584: if ($match == 1) {
3585: $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
3586: }
3587: }
3588: if (&untie_domain_hash($hashref)) {
3589: chop($qresult);
3590: &Reply($client, "$qresult\n", $userinput);
3591: } else {
3592: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3593: "while attempting courseiddump\n", $userinput);
3594: }
3595: } else {
3596: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3597: "while attempting courseiddump\n", $userinput);
3598: }
3599:
3600:
3601: return 1;
3602: }
3603: ®ister_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
3604:
3605: #
3606: # Puts an id to a domains id database.
3607: #
3608: # Parameters:
3609: # $cmd - The command that triggered us.
3610: # $tail - Remainder of the request other than the command. This is a
3611: # colon separated list containing:
3612: # $domain - The domain for which we are writing the id.
3613: # $pairs - The id info to write... this is and & separated list
3614: # of keyword=value.
3615: # $client - Socket open on the client.
3616: # Returns:
3617: # 1 - Continue processing.
3618: # Side effects:
3619: # reply is written to $client.
3620: #
3621: sub put_id_handler {
3622: my ($cmd,$tail,$client) = @_;
3623:
3624:
3625: my $userinput = "$cmd:$tail";
3626:
3627: my ($udom,$what)=split(/:/,$tail);
3628: chomp($what);
3629: my @pairs=split(/\&/,$what);
3630: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
3631: "P", $what);
3632: if ($hashref) {
3633: foreach my $pair (@pairs) {
3634: my ($key,$value)=split(/=/,$pair);
3635: $hashref->{$key}=$value;
3636: }
3637: if (&untie_domain_hash($hashref)) {
3638: &Reply($client, "ok\n", $userinput);
3639: } else {
3640: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3641: "while attempting idput\n", $userinput);
3642: }
3643: } else {
3644: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3645: "while attempting idput\n", $userinput);
3646: }
3647:
3648: return 1;
3649: }
3650: ®ister_handler("idput", \&put_id_handler, 0, 1, 0);
3651:
3652: #
3653: # Retrieves a set of id values from the id database.
3654: # Returns an & separated list of results, one for each requested id to the
3655: # client.
3656: #
3657: # Parameters:
3658: # $cmd - Command keyword that caused us to be dispatched.
3659: # $tail - Tail of the command. Consists of a colon separated:
3660: # domain - the domain whose id table we dump
3661: # ids Consists of an & separated list of
3662: # id keywords whose values will be fetched.
3663: # nonexisting keywords will have an empty value.
3664: # $client - Socket open on the client.
3665: #
3666: # Returns:
3667: # 1 - indicating processing should continue.
3668: # Side effects:
3669: # An & separated list of results is written to $client.
3670: #
3671: sub get_id_handler {
3672: my ($cmd, $tail, $client) = @_;
3673:
3674:
3675: my $userinput = "$client:$tail";
3676:
3677: my ($udom,$what)=split(/:/,$tail);
3678: chomp($what);
3679: my @queries=split(/\&/,$what);
3680: my $qresult='';
3681: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
3682: if ($hashref) {
3683: for (my $i=0;$i<=$#queries;$i++) {
3684: $qresult.="$hashref->{$queries[$i]}&";
3685: }
3686: if (&untie_domain_hash($hashref)) {
3687: $qresult=~s/\&$//;
3688: &Reply($client, "$qresult\n", $userinput);
3689: } else {
3690: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
3691: "while attempting idget\n",$userinput);
3692: }
3693: } else {
3694: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3695: "while attempting idget\n",$userinput);
3696: }
3697:
3698: return 1;
3699: }
3700: ®ister_handler("idget", \&get_id_handler, 0, 1, 0);
3701:
3702: #
3703: # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database
3704: #
3705: # Parameters
3706: # $cmd - Command keyword that caused us to be dispatched.
3707: # $tail - Tail of the command. Consists of a colon separated:
3708: # domain - the domain whose dcmail we are recording
3709: # email Consists of key=value pair
3710: # where key is unique msgid
3711: # and value is message (in XML)
3712: # $client - Socket open on the client.
3713: #
3714: # Returns:
3715: # 1 - indicating processing should continue.
3716: # Side effects
3717: # reply is written to $client.
3718: #
3719: sub put_dcmail_handler {
3720: my ($cmd,$tail,$client) = @_;
3721: my $userinput = "$cmd:$tail";
3722:
3723: my ($udom,$what)=split(/:/,$tail);
3724: chomp($what);
3725: my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
3726: if ($hashref) {
3727: my ($key,$value)=split(/=/,$what);
3728: $hashref->{$key}=$value;
3729: }
3730: if (&untie_domain_hash($hashref)) {
3731: &Reply($client, "ok\n", $userinput);
3732: } else {
3733: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3734: "while attempting dcmailput\n", $userinput);
3735: }
3736: return 1;
3737: }
3738: ®ister_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
3739:
3740: #
3741: # Retrieves broadcast e-mail from nohist_dcmail database
3742: # Returns to client an & separated list of key=value pairs,
3743: # where key is msgid and value is message information.
3744: #
3745: # Parameters
3746: # $cmd - Command keyword that caused us to be dispatched.
3747: # $tail - Tail of the command. Consists of a colon separated:
3748: # domain - the domain whose dcmail table we dump
3749: # startfilter - beginning of time window
3750: # endfilter - end of time window
3751: # sendersfilter - & separated list of username:domain
3752: # for senders to search for.
3753: # $client - Socket open on the client.
3754: #
3755: # Returns:
3756: # 1 - indicating processing should continue.
3757: # Side effects
3758: # reply (& separated list of msgid=messageinfo pairs) is
3759: # written to $client.
3760: #
3761: sub dump_dcmail_handler {
3762: my ($cmd, $tail, $client) = @_;
3763:
3764: my $userinput = "$cmd:$tail";
3765: my ($udom,$startfilter,$endfilter,$sendersfilter) = split(/:/,$tail);
3766: chomp($sendersfilter);
3767: my @senders = ();
3768: if (defined($startfilter)) {
3769: $startfilter=&unescape($startfilter);
3770: } else {
3771: $startfilter='.';
3772: }
3773: if (defined($endfilter)) {
3774: $endfilter=&unescape($endfilter);
3775: } else {
3776: $endfilter='.';
3777: }
3778: if (defined($sendersfilter)) {
3779: $sendersfilter=&unescape($sendersfilter);
3780: @senders = map { &unescape($_) } split(/\&/,$sendersfilter);
3781: }
3782:
3783: my $qresult='';
3784: my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
3785: if ($hashref) {
3786: while (my ($key,$value) = each(%$hashref)) {
3787: my $match = 1;
3788: my ($timestamp,$subj,$uname,$udom) =
3789: split(/:/,&unescape(&unescape($key)),5); # yes, twice really
3790: $subj = &unescape($subj);
3791: unless ($startfilter eq '.' || !defined($startfilter)) {
3792: if ($timestamp < $startfilter) {
3793: $match = 0;
3794: }
3795: }
3796: unless ($endfilter eq '.' || !defined($endfilter)) {
3797: if ($timestamp > $endfilter) {
3798: $match = 0;
3799: }
3800: }
3801: unless (@senders < 1) {
3802: unless (grep/^$uname:$udom$/,@senders) {
3803: $match = 0;
3804: }
3805: }
3806: if ($match == 1) {
3807: $qresult.=$key.'='.$value.'&';
3808: }
3809: }
3810: if (&untie_domain_hash($hashref)) {
3811: chop($qresult);
3812: &Reply($client, "$qresult\n", $userinput);
3813: } else {
3814: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3815: "while attempting dcmaildump\n", $userinput);
3816: }
3817: } else {
3818: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3819: "while attempting dcmaildump\n", $userinput);
3820: }
3821: return 1;
3822: }
3823:
3824: ®ister_handler("dcmaildump", \&dump_dcmail_handler, 0, 1, 0);
3825:
3826: #
3827: # Puts domain roles in nohist_domainroles database
3828: #
3829: # Parameters
3830: # $cmd - Command keyword that caused us to be dispatched.
3831: # $tail - Tail of the command. Consists of a colon separated:
3832: # domain - the domain whose roles we are recording
3833: # role - Consists of key=value pair
3834: # where key is unique role
3835: # and value is start/end date information
3836: # $client - Socket open on the client.
3837: #
3838: # Returns:
3839: # 1 - indicating processing should continue.
3840: # Side effects
3841: # reply is written to $client.
3842: #
3843:
3844: sub put_domainroles_handler {
3845: my ($cmd,$tail,$client) = @_;
3846:
3847: my $userinput = "$cmd:$tail";
3848: my ($udom,$what)=split(/:/,$tail);
3849: chomp($what);
3850: my @pairs=split(/\&/,$what);
3851: my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
3852: if ($hashref) {
3853: foreach my $pair (@pairs) {
3854: my ($key,$value)=split(/=/,$pair);
3855: $hashref->{$key}=$value;
3856: }
3857: if (&untie_domain_hash($hashref)) {
3858: &Reply($client, "ok\n", $userinput);
3859: } else {
3860: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3861: "while attempting domroleput\n", $userinput);
3862: }
3863: } else {
3864: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3865: "while attempting domroleput\n", $userinput);
3866: }
3867:
3868: return 1;
3869: }
3870:
3871: ®ister_handler("domroleput", \&put_domainroles_handler, 0, 1, 0);
3872:
3873: #
3874: # Retrieves domain roles from nohist_domainroles database
3875: # Returns to client an & separated list of key=value pairs,
3876: # where key is role and value is start and end date information.
3877: #
3878: # Parameters
3879: # $cmd - Command keyword that caused us to be dispatched.
3880: # $tail - Tail of the command. Consists of a colon separated:
3881: # domain - the domain whose domain roles table we dump
3882: # $client - Socket open on the client.
3883: #
3884: # Returns:
3885: # 1 - indicating processing should continue.
3886: # Side effects
3887: # reply (& separated list of role=start/end info pairs) is
3888: # written to $client.
3889: #
3890: sub dump_domainroles_handler {
3891: my ($cmd, $tail, $client) = @_;
3892:
3893: my $userinput = "$cmd:$tail";
3894: my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail);
3895: chomp($rolesfilter);
3896: my @roles = ();
3897: if (defined($startfilter)) {
3898: $startfilter=&unescape($startfilter);
3899: } else {
3900: $startfilter='.';
3901: }
3902: if (defined($endfilter)) {
3903: $endfilter=&unescape($endfilter);
3904: } else {
3905: $endfilter='.';
3906: }
3907: if (defined($rolesfilter)) {
3908: $rolesfilter=&unescape($rolesfilter);
3909: @roles = split(/\&/,$rolesfilter);
3910: }
3911:
3912: my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
3913: if ($hashref) {
3914: my $qresult = '';
3915: while (my ($key,$value) = each(%$hashref)) {
3916: my $match = 1;
3917: my ($start,$end) = split(/:/,&unescape($value));
3918: my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
3919: unless ($startfilter eq '.' || !defined($startfilter)) {
3920: if ($start >= $startfilter) {
3921: $match = 0;
3922: }
3923: }
3924: unless ($endfilter eq '.' || !defined($endfilter)) {
3925: if ($end <= $endfilter) {
3926: $match = 0;
3927: }
3928: }
3929: unless (@roles < 1) {
3930: unless (grep/^$trole$/,@roles) {
3931: $match = 0;
3932: }
3933: }
3934: if ($match == 1) {
3935: $qresult.=$key.'='.$value.'&';
3936: }
3937: }
3938: if (&untie_domain_hash($hashref)) {
3939: chop($qresult);
3940: &Reply($client, "$qresult\n", $userinput);
3941: } else {
3942: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3943: "while attempting domrolesdump\n", $userinput);
3944: }
3945: } else {
3946: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3947: "while attempting domrolesdump\n", $userinput);
3948: }
3949: return 1;
3950: }
3951:
3952: ®ister_handler("domrolesdump", \&dump_domainroles_handler, 0, 1, 0);
3953:
3954:
3955: # Process the tmpput command I'm not sure what this does.. Seems to
3956: # create a file in the lonDaemons/tmp directory of the form $id.tmp
3957: # where Id is the client's ip concatenated with a sequence number.
3958: # The file will contain some value that is passed in. Is this e.g.
3959: # a login token?
3960: #
3961: # Parameters:
3962: # $cmd - The command that got us dispatched.
3963: # $tail - The remainder of the request following $cmd:
3964: # In this case this will be the contents of the file.
3965: # $client - Socket connected to the client.
3966: # Returns:
3967: # 1 indicating processing can continue.
3968: # Side effects:
3969: # A file is created in the local filesystem.
3970: # A reply is sent to the client.
3971: sub tmp_put_handler {
3972: my ($cmd, $what, $client) = @_;
3973:
3974: my $userinput = "$cmd:$what"; # Reconstruct for logging.
3975:
3976:
3977: my $store;
3978: $tmpsnum++;
3979: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
3980: $id=~s/\W/\_/g;
3981: $what=~s/\n//g;
3982: my $execdir=$perlvar{'lonDaemons'};
3983: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
3984: print $store $what;
3985: close $store;
3986: &Reply($client, "$id\n", $userinput);
3987: } else {
3988: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
3989: "while attempting tmpput\n", $userinput);
3990: }
3991: return 1;
3992:
3993: }
3994: ®ister_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
3995:
3996: # Processes the tmpget command. This command returns the contents
3997: # of a temporary resource file(?) created via tmpput.
3998: #
3999: # Paramters:
4000: # $cmd - Command that got us dispatched.
4001: # $id - Tail of the command, contain the id of the resource
4002: # we want to fetch.
4003: # $client - socket open on the client.
4004: # Return:
4005: # 1 - Inidcating processing can continue.
4006: # Side effects:
4007: # A reply is sent to the client.
4008: #
4009: sub tmp_get_handler {
4010: my ($cmd, $id, $client) = @_;
4011:
4012: my $userinput = "$cmd:$id";
4013:
4014:
4015: $id=~s/\W/\_/g;
4016: my $store;
4017: my $execdir=$perlvar{'lonDaemons'};
4018: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
4019: my $reply=<$store>;
4020: &Reply( $client, "$reply\n", $userinput);
4021: close $store;
4022: } else {
4023: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
4024: "while attempting tmpget\n", $userinput);
4025: }
4026:
4027: return 1;
4028: }
4029: ®ister_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
4030:
4031: #
4032: # Process the tmpdel command. This command deletes a temp resource
4033: # created by the tmpput command.
4034: #
4035: # Parameters:
4036: # $cmd - Command that got us here.
4037: # $id - Id of the temporary resource created.
4038: # $client - socket open on the client process.
4039: #
4040: # Returns:
4041: # 1 - Indicating processing should continue.
4042: # Side Effects:
4043: # A file is deleted
4044: # A reply is sent to the client.
4045: sub tmp_del_handler {
4046: my ($cmd, $id, $client) = @_;
4047:
4048: my $userinput= "$cmd:$id";
4049:
4050: chomp($id);
4051: $id=~s/\W/\_/g;
4052: my $execdir=$perlvar{'lonDaemons'};
4053: if (unlink("$execdir/tmp/$id.tmp")) {
4054: &Reply($client, "ok\n", $userinput);
4055: } else {
4056: &Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
4057: "while attempting tmpdel\n", $userinput);
4058: }
4059:
4060: return 1;
4061:
4062: }
4063: ®ister_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
4064:
4065: #
4066: # Processes the setannounce command. This command
4067: # creates a file named announce.txt in the top directory of
4068: # the documentn root and sets its contents. The announce.txt file is
4069: # printed in its entirety at the LonCAPA login page. Note:
4070: # once the announcement.txt fileis created it cannot be deleted.
4071: # However, setting the contents of the file to empty removes the
4072: # announcement from the login page of loncapa so who cares.
4073: #
4074: # Parameters:
4075: # $cmd - The command that got us dispatched.
4076: # $announcement - The text of the announcement.
4077: # $client - Socket open on the client process.
4078: # Retunrns:
4079: # 1 - Indicating request processing should continue
4080: # Side Effects:
4081: # The file {DocRoot}/announcement.txt is created.
4082: # A reply is sent to $client.
4083: #
4084: sub set_announce_handler {
4085: my ($cmd, $announcement, $client) = @_;
4086:
4087: my $userinput = "$cmd:$announcement";
4088:
4089: chomp($announcement);
4090: $announcement=&unescape($announcement);
4091: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
4092: '/announcement.txt')) {
4093: print $store $announcement;
4094: close $store;
4095: &Reply($client, "ok\n", $userinput);
4096: } else {
4097: &Failure($client, "error: ".($!+0)."\n", $userinput);
4098: }
4099:
4100: return 1;
4101: }
4102: ®ister_handler("setannounce", \&set_announce_handler, 0, 1, 0);
4103:
4104: #
4105: # Return the version of the daemon. This can be used to determine
4106: # the compatibility of cross version installations or, alternatively to
4107: # simply know who's out of date and who isn't. Note that the version
4108: # is returned concatenated with the tail.
4109: # Parameters:
4110: # $cmd - the request that dispatched to us.
4111: # $tail - Tail of the request (client's version?).
4112: # $client - Socket open on the client.
4113: #Returns:
4114: # 1 - continue processing requests.
4115: # Side Effects:
4116: # Replies with version to $client.
4117: sub get_version_handler {
4118: my ($cmd, $tail, $client) = @_;
4119:
4120: my $userinput = $cmd.$tail;
4121:
4122: &Reply($client, &version($userinput)."\n", $userinput);
4123:
4124:
4125: return 1;
4126: }
4127: ®ister_handler("version", \&get_version_handler, 0, 1, 0);
4128:
4129: # Set the current host and domain. This is used to support
4130: # multihomed systems. Each IP of the system, or even separate daemons
4131: # on the same IP can be treated as handling a separate lonCAPA virtual
4132: # machine. This command selects the virtual lonCAPA. The client always
4133: # knows the right one since it is lonc and it is selecting the domain/system
4134: # from the hosts.tab file.
4135: # Parameters:
4136: # $cmd - Command that dispatched us.
4137: # $tail - Tail of the command (domain/host requested).
4138: # $socket - Socket open on the client.
4139: #
4140: # Returns:
4141: # 1 - Indicates the program should continue to process requests.
4142: # Side-effects:
4143: # The default domain/system context is modified for this daemon.
4144: # a reply is sent to the client.
4145: #
4146: sub set_virtual_host_handler {
4147: my ($cmd, $tail, $socket) = @_;
4148:
4149: my $userinput ="$cmd:$tail";
4150:
4151: &Reply($client, &sethost($userinput)."\n", $userinput);
4152:
4153:
4154: return 1;
4155: }
4156: ®ister_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
4157:
4158: # Process a request to exit:
4159: # - "bye" is sent to the client.
4160: # - The client socket is shutdown and closed.
4161: # - We indicate to the caller that we should exit.
4162: # Formal Parameters:
4163: # $cmd - The command that got us here.
4164: # $tail - Tail of the command (empty).
4165: # $client - Socket open on the tail.
4166: # Returns:
4167: # 0 - Indicating the program should exit!!
4168: #
4169: sub exit_handler {
4170: my ($cmd, $tail, $client) = @_;
4171:
4172: my $userinput = "$cmd:$tail";
4173:
4174: &logthis("Client $clientip ($clientname) hanging up: $userinput");
4175: &Reply($client, "bye\n", $userinput);
4176: $client->shutdown(2); # shutdown the socket forcibly.
4177: $client->close();
4178:
4179: return 0;
4180: }
4181: ®ister_handler("exit", \&exit_handler, 0,1,1);
4182: ®ister_handler("init", \&exit_handler, 0,1,1);
4183: ®ister_handler("quit", \&exit_handler, 0,1,1);
4184:
4185: # Determine if auto-enrollment is enabled.
4186: # Note that the original had what I believe to be a defect.
4187: # The original returned 0 if the requestor was not a registerd client.
4188: # It should return "refused".
4189: # Formal Parameters:
4190: # $cmd - The command that invoked us.
4191: # $tail - The tail of the command (Extra command parameters.
4192: # $client - The socket open on the client that issued the request.
4193: # Returns:
4194: # 1 - Indicating processing should continue.
4195: #
4196: sub enrollment_enabled_handler {
4197: my ($cmd, $tail, $client) = @_;
4198: my $userinput = $cmd.":".$tail; # For logging purposes.
4199:
4200:
4201: my $cdom = split(/:/, $tail); # Domain we're asking about.
4202: my $outcome = &localenroll::run($cdom);
4203: &Reply($client, "$outcome\n", $userinput);
4204:
4205: return 1;
4206: }
4207: ®ister_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
4208:
4209: # Get the official sections for which auto-enrollment is possible.
4210: # Since the admin people won't know about 'unofficial sections'
4211: # we cannot auto-enroll on them.
4212: # Formal Parameters:
4213: # $cmd - The command request that got us dispatched here.
4214: # $tail - The remainder of the request. In our case this
4215: # will be split into:
4216: # $coursecode - The course name from the admin point of view.
4217: # $cdom - The course's domain(?).
4218: # $client - Socket open on the client.
4219: # Returns:
4220: # 1 - Indiciting processing should continue.
4221: #
4222: sub get_sections_handler {
4223: my ($cmd, $tail, $client) = @_;
4224: my $userinput = "$cmd:$tail";
4225:
4226: my ($coursecode, $cdom) = split(/:/, $tail);
4227: my @secs = &localenroll::get_sections($coursecode,$cdom);
4228: my $seclist = &escape(join(':',@secs));
4229:
4230: &Reply($client, "$seclist\n", $userinput);
4231:
4232:
4233: return 1;
4234: }
4235: ®ister_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
4236:
4237: # Validate the owner of a new course section.
4238: #
4239: # Formal Parameters:
4240: # $cmd - Command that got us dispatched.
4241: # $tail - the remainder of the command. For us this consists of a
4242: # colon separated string containing:
4243: # $inst - Course Id from the institutions point of view.
4244: # $owner - Proposed owner of the course.
4245: # $cdom - Domain of the course (from the institutions
4246: # point of view?)..
4247: # $client - Socket open on the client.
4248: #
4249: # Returns:
4250: # 1 - Processing should continue.
4251: #
4252: sub validate_course_owner_handler {
4253: my ($cmd, $tail, $client) = @_;
4254: my $userinput = "$cmd:$tail";
4255: my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
4256:
4257: my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
4258: &Reply($client, "$outcome\n", $userinput);
4259:
4260:
4261:
4262: return 1;
4263: }
4264: ®ister_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
4265:
4266: #
4267: # Validate a course section in the official schedule of classes
4268: # from the institutions point of view (part of autoenrollment).
4269: #
4270: # Formal Parameters:
4271: # $cmd - The command request that got us dispatched.
4272: # $tail - The tail of the command. In this case,
4273: # this is a colon separated set of words that will be split
4274: # into:
4275: # $inst_course_id - The course/section id from the
4276: # institutions point of view.
4277: # $cdom - The domain from the institutions
4278: # point of view.
4279: # $client - Socket open on the client.
4280: # Returns:
4281: # 1 - Indicating processing should continue.
4282: #
4283: sub validate_course_section_handler {
4284: my ($cmd, $tail, $client) = @_;
4285: my $userinput = "$cmd:$tail";
4286: my ($inst_course_id, $cdom) = split(/:/, $tail);
4287:
4288: my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
4289: &Reply($client, "$outcome\n", $userinput);
4290:
4291:
4292: return 1;
4293: }
4294: ®ister_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
4295:
4296: #
4297: # Create a password for a new auto-enrollment user.
4298: # I think/guess, this password allows access to the institutions
4299: # AIS class list server/services. Stuart can correct this comment
4300: # when he finds out how wrong I am.
4301: #
4302: # Formal Parameters:
4303: # $cmd - The command request that got us dispatched.
4304: # $tail - The tail of the command. In this case this is a colon separated
4305: # set of words that will be split into:
4306: # $authparam - An authentication parameter (username??).
4307: # $cdom - The domain of the course from the institution's
4308: # point of view.
4309: # $client - The socket open on the client.
4310: # Returns:
4311: # 1 - continue processing.
4312: #
4313: sub create_auto_enroll_password_handler {
4314: my ($cmd, $tail, $client) = @_;
4315: my $userinput = "$cmd:$tail";
4316:
4317: my ($authparam, $cdom) = split(/:/, $userinput);
4318:
4319: my ($create_passwd,$authchk);
4320: ($authparam,
4321: $create_passwd,
4322: $authchk) = &localenroll::create_password($authparam,$cdom);
4323:
4324: &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
4325: $userinput);
4326:
4327:
4328: return 1;
4329: }
4330: ®ister_handler("autocreatepassword", \&create_auto_enroll_password_handler,
4331: 0, 1, 0);
4332:
4333: # Retrieve and remove temporary files created by/during autoenrollment.
4334: #
4335: # Formal Parameters:
4336: # $cmd - The command that got us dispatched.
4337: # $tail - The tail of the command. In our case this is a colon
4338: # separated list that will be split into:
4339: # $filename - The name of the file to remove.
4340: # The filename is given as a path relative to
4341: # the LonCAPA temp file directory.
4342: # $client - Socket open on the client.
4343: #
4344: # Returns:
4345: # 1 - Continue processing.
4346: sub retrieve_auto_file_handler {
4347: my ($cmd, $tail, $client) = @_;
4348: my $userinput = "cmd:$tail";
4349:
4350: my ($filename) = split(/:/, $tail);
4351:
4352: my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
4353: if ( (-e $source) && ($filename ne '') ) {
4354: my $reply = '';
4355: if (open(my $fh,$source)) {
4356: while (<$fh>) {
4357: chomp($_);
4358: $_ =~ s/^\s+//g;
4359: $_ =~ s/\s+$//g;
4360: $reply .= $_;
4361: }
4362: close($fh);
4363: &Reply($client, &escape($reply)."\n", $userinput);
4364:
4365: # Does this have to be uncommented??!? (RF).
4366: #
4367: # unlink($source);
4368: } else {
4369: &Failure($client, "error\n", $userinput);
4370: }
4371: } else {
4372: &Failure($client, "error\n", $userinput);
4373: }
4374:
4375:
4376: return 1;
4377: }
4378: ®ister_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
4379:
4380: #
4381: # Read and retrieve institutional code format (for support form).
4382: # Formal Parameters:
4383: # $cmd - Command that dispatched us.
4384: # $tail - Tail of the command. In this case it conatins
4385: # the course domain and the coursename.
4386: # $client - Socket open on the client.
4387: # Returns:
4388: # 1 - Continue processing.
4389: #
4390: sub get_institutional_code_format_handler {
4391: my ($cmd, $tail, $client) = @_;
4392: my $userinput = "$cmd:$tail";
4393:
4394: my $reply;
4395: my($cdom,$course) = split(/:/,$tail);
4396: my @pairs = split/\&/,$course;
4397: my %instcodes = ();
4398: my %codes = ();
4399: my @codetitles = ();
4400: my %cat_titles = ();
4401: my %cat_order = ();
4402: foreach (@pairs) {
4403: my ($key,$value) = split/=/,$_;
4404: $instcodes{&unescape($key)} = &unescape($value);
4405: }
4406: my $formatreply = &localenroll::instcode_format($cdom,
4407: \%instcodes,
4408: \%codes,
4409: \@codetitles,
4410: \%cat_titles,
4411: \%cat_order);
4412: if ($formatreply eq 'ok') {
4413: my $codes_str = &hash2str(%codes);
4414: my $codetitles_str = &array2str(@codetitles);
4415: my $cat_titles_str = &hash2str(%cat_titles);
4416: my $cat_order_str = &hash2str(%cat_order);
4417: &Reply($client,
4418: $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
4419: .$cat_order_str."\n",
4420: $userinput);
4421: } else {
4422: # this else branch added by RF since if not ok, lonc will
4423: # hang waiting on reply until timeout.
4424: #
4425: &Reply($client, "format_error\n", $userinput);
4426: }
4427:
4428: return 1;
4429: }
4430: ®ister_handler("autoinstcodeformat",
4431: \&get_institutional_code_format_handler,0,1,0);
4432:
4433: # Get domain specific conditions for import of student photographs to a course
4434: #
4435: # Retrieves information from photo_permission subroutine in localenroll.
4436: # Returns outcome (ok) if no processing errors, and whether course owner is
4437: # required to accept conditions of use (yes/no).
4438: #
4439: #
4440: sub photo_permission_handler {
4441: my ($cmd, $tail, $client) = @_;
4442: my $userinput = "$cmd:$tail";
4443: my $cdom = $tail;
4444: my ($perm_reqd,$conditions);
4445: my $outcome;
4446: eval {
4447: local($SIG{__DIE__})='DEFAULT';
4448: $outcome = &localenroll::photo_permission($cdom,\$perm_reqd,
4449: \$conditions);
4450: };
4451: if (!$@) {
4452: &Reply($client, &escape($outcome.':'.$perm_reqd.':'. $conditions)."\n",
4453: $userinput);
4454: } else {
4455: &Failure($client,"unknown_cmd\n",$userinput);
4456: }
4457: return 1;
4458: }
4459: ®ister_handler("autophotopermission",\&photo_permission_handler,0,1,0);
4460:
4461: #
4462: # Checks if student photo is available for a user in the domain, in the user's
4463: # directory (in /userfiles/internal/studentphoto.jpg).
4464: # Uses localstudentphoto:fetch() to ensure there is an up to date copy of
4465: # the student's photo.
4466:
4467: sub photo_check_handler {
4468: my ($cmd, $tail, $client) = @_;
4469: my $userinput = "$cmd:$tail";
4470: my ($udom,$uname,$pid) = split(/:/,$tail);
4471: $udom = &unescape($udom);
4472: $uname = &unescape($uname);
4473: $pid = &unescape($pid);
4474: my $path=&propath($udom,$uname).'/userfiles/internal/';
4475: if (!-e $path) {
4476: &mkpath($path);
4477: }
4478: my $response;
4479: my $result = &localstudentphoto::fetch($udom,$uname,$pid,\$response);
4480: $result .= ':'.$response;
4481: &Reply($client, &escape($result)."\n",$userinput);
4482: return 1;
4483: }
4484: ®ister_handler("autophotocheck",\&photo_check_handler,0,1,0);
4485:
4486: #
4487: # Retrieve information from localenroll about whether to provide a button
4488: # for users who have enbled import of student photos to initiate an
4489: # update of photo files for registered students. Also include
4490: # comment to display alongside button.
4491:
4492: sub photo_choice_handler {
4493: my ($cmd, $tail, $client) = @_;
4494: my $userinput = "$cmd:$tail";
4495: my $cdom = &unescape($tail);
4496: my ($update,$comment);
4497: eval {
4498: local($SIG{__DIE__})='DEFAULT';
4499: ($update,$comment) = &localenroll::manager_photo_update($cdom);
4500: };
4501: if (!$@) {
4502: &Reply($client,&escape($update).':'.&escape($comment)."\n",$userinput);
4503: } else {
4504: &Failure($client,"unknown_cmd\n",$userinput);
4505: }
4506: return 1;
4507: }
4508: ®ister_handler("autophotochoice",\&photo_choice_handler,0,1,0);
4509:
4510: #
4511: # Gets a student's photo to exist (in the correct image type) in the user's
4512: # directory.
4513: # Formal Parameters:
4514: # $cmd - The command request that got us dispatched.
4515: # $tail - A colon separated set of words that will be split into:
4516: # $domain - student's domain
4517: # $uname - student username
4518: # $type - image type desired
4519: # $client - The socket open on the client.
4520: # Returns:
4521: # 1 - continue processing.
4522:
4523: sub student_photo_handler {
4524: my ($cmd, $tail, $client) = @_;
4525: my ($domain,$uname,$ext,$type) = split(/:/, $tail);
4526:
4527: my $path=&propath($domain,$uname). '/userfiles/internal/';
4528: my $filename = 'studentphoto.'.$ext;
4529: if ($type eq 'thumbnail') {
4530: $filename = 'studentphoto_tn.'.$ext;
4531: }
4532: if (-e $path.$filename) {
4533: &Reply($client,"ok\n","$cmd:$tail");
4534: return 1;
4535: }
4536: &mkpath($path);
4537: my $file;
4538: if ($type eq 'thumbnail') {
4539: eval {
4540: local($SIG{__DIE__})='DEFAULT';
4541: $file=&localstudentphoto::fetch_thumbnail($domain,$uname);
4542: };
4543: } else {
4544: $file=&localstudentphoto::fetch($domain,$uname);
4545: }
4546: if (!$file) {
4547: &Failure($client,"unavailable\n","$cmd:$tail");
4548: return 1;
4549: }
4550: if (!-e $path.$filename) { &convert_photo($file,$path.$filename); }
4551: if (-e $path.$filename) {
4552: &Reply($client,"ok\n","$cmd:$tail");
4553: return 1;
4554: }
4555: &Failure($client,"unable_to_convert\n","$cmd:$tail");
4556: return 1;
4557: }
4558: ®ister_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
4559:
4560: # mkpath makes all directories for a file, expects an absolute path with a
4561: # file or a trailing / if just a dir is passed
4562: # returns 1 on success 0 on failure
4563: sub mkpath {
4564: my ($file)=@_;
4565: my @parts=split(/\//,$file,-1);
4566: my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
4567: for (my $i=3;$i<= ($#parts-1);$i++) {
4568: $now.='/'.$parts[$i];
4569: if (!-e $now) {
4570: if (!mkdir($now,0770)) { return 0; }
4571: }
4572: }
4573: return 1;
4574: }
4575:
4576: #---------------------------------------------------------------
4577: #
4578: # Getting, decoding and dispatching requests:
4579: #
4580: #
4581: # Get a Request:
4582: # Gets a Request message from the client. The transaction
4583: # is defined as a 'line' of text. We remove the new line
4584: # from the text line.
4585: #
4586: sub get_request {
4587: my $input = <$client>;
4588: chomp($input);
4589:
4590: &Debug("get_request: Request = $input\n");
4591:
4592: &status('Processing '.$clientname.':'.$input);
4593:
4594: return $input;
4595: }
4596: #---------------------------------------------------------------
4597: #
4598: # Process a request. This sub should shrink as each action
4599: # gets farmed out into a separat sub that is registered
4600: # with the dispatch hash.
4601: #
4602: # Parameters:
4603: # user_input - The request received from the client (lonc).
4604: # Returns:
4605: # true to keep processing, false if caller should exit.
4606: #
4607: sub process_request {
4608: my ($userinput) = @_; # Easier for now to break style than to
4609: # fix all the userinput -> user_input.
4610: my $wasenc = 0; # True if request was encrypted.
4611: # ------------------------------------------------------------ See if encrypted
4612: # for command
4613: # sethost:<server>
4614: # <command>:<args>
4615: # we just send it to the processor
4616: # for
4617: # sethost:<server>:<command>:<args>
4618: # we do the implict set host and then do the command
4619: if ($userinput =~ /^sethost:/) {
4620: (my $cmd,my $newid,$userinput) = split(':',$userinput,3);
4621: if (defined($userinput)) {
4622: &sethost("$cmd:$newid");
4623: } else {
4624: $userinput = "$cmd:$newid";
4625: }
4626: }
4627:
4628: if ($userinput =~ /^enc/) {
4629: $userinput = decipher($userinput);
4630: $wasenc=1;
4631: if(!$userinput) { # Cipher not defined.
4632: &Failure($client, "error: Encrypted data without negotated key\n");
4633: return 0;
4634: }
4635: }
4636: Debug("process_request: $userinput\n");
4637:
4638: #
4639: # The 'correct way' to add a command to lond is now to
4640: # write a sub to execute it and Add it to the command dispatch
4641: # hash via a call to register_handler.. The comments to that
4642: # sub should give you enough to go on to show how to do this
4643: # along with the examples that are building up as this code
4644: # is getting refactored. Until all branches of the
4645: # if/elseif monster below have been factored out into
4646: # separate procesor subs, if the dispatch hash is missing
4647: # the command keyword, we will fall through to the remainder
4648: # of the if/else chain below in order to keep this thing in
4649: # working order throughout the transmogrification.
4650:
4651: my ($command, $tail) = split(/:/, $userinput, 2);
4652: chomp($command);
4653: chomp($tail);
4654: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
4655: $command =~ s/(\r)//; # And this too for parameterless commands.
4656: if(!$tail) {
4657: $tail =""; # defined but blank.
4658: }
4659:
4660: &Debug("Command received: $command, encoded = $wasenc");
4661:
4662: if(defined $Dispatcher{$command}) {
4663:
4664: my $dispatch_info = $Dispatcher{$command};
4665: my $handler = $$dispatch_info[0];
4666: my $need_encode = $$dispatch_info[1];
4667: my $client_types = $$dispatch_info[2];
4668: Debug("Matched dispatch hash: mustencode: $need_encode "
4669: ."ClientType $client_types");
4670:
4671: # Validate the request:
4672:
4673: my $ok = 1;
4674: my $requesterprivs = 0;
4675: if(&isClient()) {
4676: $requesterprivs |= $CLIENT_OK;
4677: }
4678: if(&isManager()) {
4679: $requesterprivs |= $MANAGER_OK;
4680: }
4681: if($need_encode && (!$wasenc)) {
4682: Debug("Must encode but wasn't: $need_encode $wasenc");
4683: $ok = 0;
4684: }
4685: if(($client_types & $requesterprivs) == 0) {
4686: Debug("Client not privileged to do this operation");
4687: $ok = 0;
4688: }
4689:
4690: if($ok) {
4691: Debug("Dispatching to handler $command $tail");
4692: my $keep_going = &$handler($command, $tail, $client);
4693: return $keep_going;
4694: } else {
4695: Debug("Refusing to dispatch because client did not match requirements");
4696: Failure($client, "refused\n", $userinput);
4697: return 1;
4698: }
4699:
4700: }
4701:
4702: print $client "unknown_cmd\n";
4703: # -------------------------------------------------------------------- complete
4704: Debug("process_request - returning 1");
4705: return 1;
4706: }
4707: #
4708: # Decipher encoded traffic
4709: # Parameters:
4710: # input - Encoded data.
4711: # Returns:
4712: # Decoded data or undef if encryption key was not yet negotiated.
4713: # Implicit input:
4714: # cipher - This global holds the negotiated encryption key.
4715: #
4716: sub decipher {
4717: my ($input) = @_;
4718: my $output = '';
4719:
4720:
4721: if($cipher) {
4722: my($enc, $enclength, $encinput) = split(/:/, $input);
4723: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
4724: $output .=
4725: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
4726: }
4727: return substr($output, 0, $enclength);
4728: } else {
4729: return undef;
4730: }
4731: }
4732:
4733: #
4734: # Register a command processor. This function is invoked to register a sub
4735: # to process a request. Once registered, the ProcessRequest sub can automatically
4736: # dispatch requests to an appropriate sub, and do the top level validity checking
4737: # as well:
4738: # - Is the keyword recognized.
4739: # - Is the proper client type attempting the request.
4740: # - Is the request encrypted if it has to be.
4741: # Parameters:
4742: # $request_name - Name of the request being registered.
4743: # This is the command request that will match
4744: # against the hash keywords to lookup the information
4745: # associated with the dispatch information.
4746: # $procedure - Reference to a sub to call to process the request.
4747: # All subs get called as follows:
4748: # Procedure($cmd, $tail, $replyfd, $key)
4749: # $cmd - the actual keyword that invoked us.
4750: # $tail - the tail of the request that invoked us.
4751: # $replyfd- File descriptor connected to the client
4752: # $must_encode - True if the request must be encoded to be good.
4753: # $client_ok - True if it's ok for a client to request this.
4754: # $manager_ok - True if it's ok for a manager to request this.
4755: # Side effects:
4756: # - On success, the Dispatcher hash has an entry added for the key $RequestName
4757: # - On failure, the program will die as it's a bad internal bug to try to
4758: # register a duplicate command handler.
4759: #
4760: sub register_handler {
4761: my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_;
4762:
4763: # Don't allow duplication#
4764:
4765: if (defined $Dispatcher{$request_name}) {
4766: die "Attempting to define a duplicate request handler for $request_name\n";
4767: }
4768: # Build the client type mask:
4769:
4770: my $client_type_mask = 0;
4771: if($client_ok) {
4772: $client_type_mask |= $CLIENT_OK;
4773: }
4774: if($manager_ok) {
4775: $client_type_mask |= $MANAGER_OK;
4776: }
4777:
4778: # Enter the hash:
4779:
4780: my @entry = ($procedure, $must_encode, $client_type_mask);
4781:
4782: $Dispatcher{$request_name} = \@entry;
4783:
4784: }
4785:
4786:
4787: #------------------------------------------------------------------
4788:
4789:
4790:
4791:
4792: #
4793: # Convert an error return code from lcpasswd to a string value.
4794: #
4795: sub lcpasswdstrerror {
4796: my $ErrorCode = shift;
4797: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
4798: return "lcpasswd Unrecognized error return value ".$ErrorCode;
4799: } else {
4800: return $passwderrors[$ErrorCode];
4801: }
4802: }
4803:
4804: #
4805: # Convert an error return code from lcuseradd to a string value:
4806: #
4807: sub lcuseraddstrerror {
4808: my $ErrorCode = shift;
4809: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
4810: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
4811: } else {
4812: return $adderrors[$ErrorCode];
4813: }
4814: }
4815:
4816: # grabs exception and records it to log before exiting
4817: sub catchexception {
4818: my ($error)=@_;
4819: $SIG{'QUIT'}='DEFAULT';
4820: $SIG{__DIE__}='DEFAULT';
4821: &status("Catching exception");
4822: &logthis("<font color='red'>CRITICAL: "
4823: ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
4824: ."a crash with this error msg->[$error]</font>");
4825: &logthis('Famous last words: '.$status.' - '.$lastlog);
4826: if ($client) { print $client "error: $error\n"; }
4827: $server->close();
4828: die($error);
4829: }
4830: sub timeout {
4831: &status("Handling Timeout");
4832: &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
4833: &catchexception('Timeout');
4834: }
4835: # -------------------------------- Set signal handlers to record abnormal exits
4836:
4837:
4838: $SIG{'QUIT'}=\&catchexception;
4839: $SIG{__DIE__}=\&catchexception;
4840:
4841: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
4842: &status("Read loncapa.conf and loncapa_apache.conf");
4843: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
4844: %perlvar=%{$perlvarref};
4845: undef $perlvarref;
4846:
4847: # ----------------------------- Make sure this process is running from user=www
4848: my $wwwid=getpwnam('www');
4849: if ($wwwid!=$<) {
4850: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
4851: my $subj="LON: $currenthostid User ID mismatch";
4852: system("echo 'User ID mismatch. lond must be run as user www.' |\
4853: mailto $emailto -s '$subj' > /dev/null");
4854: exit 1;
4855: }
4856:
4857: # --------------------------------------------- Check if other instance running
4858:
4859: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
4860:
4861: if (-e $pidfile) {
4862: my $lfh=IO::File->new("$pidfile");
4863: my $pide=<$lfh>;
4864: chomp($pide);
4865: if (kill 0 => $pide) { die "already running"; }
4866: }
4867:
4868: # ------------------------------------------------------------- Read hosts file
4869:
4870:
4871:
4872: # establish SERVER socket, bind and listen.
4873: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
4874: Type => SOCK_STREAM,
4875: Proto => 'tcp',
4876: Reuse => 1,
4877: Listen => 10 )
4878: or die "making socket: $@\n";
4879:
4880: # --------------------------------------------------------- Do global variables
4881:
4882: # global variables
4883:
4884: my %children = (); # keys are current child process IDs
4885:
4886: sub REAPER { # takes care of dead children
4887: $SIG{CHLD} = \&REAPER;
4888: &status("Handling child death");
4889: my $pid;
4890: do {
4891: $pid = waitpid(-1,&WNOHANG());
4892: if (defined($children{$pid})) {
4893: &logthis("Child $pid died");
4894: delete($children{$pid});
4895: } elsif ($pid > 0) {
4896: &logthis("Unknown Child $pid died");
4897: }
4898: } while ( $pid > 0 );
4899: foreach my $child (keys(%children)) {
4900: $pid = waitpid($child,&WNOHANG());
4901: if ($pid > 0) {
4902: &logthis("Child $child - $pid looks like we missed it's death");
4903: delete($children{$pid});
4904: }
4905: }
4906: &status("Finished Handling child death");
4907: }
4908:
4909: sub HUNTSMAN { # signal handler for SIGINT
4910: &status("Killing children (INT)");
4911: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
4912: kill 'INT' => keys %children;
4913: &logthis("Free socket: ".shutdown($server,2)); # free up socket
4914: my $execdir=$perlvar{'lonDaemons'};
4915: unlink("$execdir/logs/lond.pid");
4916: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
4917: &status("Done killing children");
4918: exit; # clean up with dignity
4919: }
4920:
4921: sub HUPSMAN { # signal handler for SIGHUP
4922: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
4923: &status("Killing children for restart (HUP)");
4924: kill 'INT' => keys %children;
4925: &logthis("Free socket: ".shutdown($server,2)); # free up socket
4926: &logthis("<font color='red'>CRITICAL: Restarting</font>");
4927: my $execdir=$perlvar{'lonDaemons'};
4928: unlink("$execdir/logs/lond.pid");
4929: &status("Restarting self (HUP)");
4930: exec("$execdir/lond"); # here we go again
4931: }
4932:
4933: #
4934: # Kill off hashes that describe the host table prior to re-reading it.
4935: # Hashes affected are:
4936: # %hostid, %hostdom %hostip %hostdns.
4937: #
4938: sub KillHostHashes {
4939: foreach my $key (keys %hostid) {
4940: delete $hostid{$key};
4941: }
4942: foreach my $key (keys %hostdom) {
4943: delete $hostdom{$key};
4944: }
4945: foreach my $key (keys %hostip) {
4946: delete $hostip{$key};
4947: }
4948: foreach my $key (keys %hostdns) {
4949: delete $hostdns{$key};
4950: }
4951: }
4952: #
4953: # Read in the host table from file and distribute it into the various hashes:
4954: #
4955: # - %hostid - Indexed by IP, the loncapa hostname.
4956: # - %hostdom - Indexed by loncapa hostname, the domain.
4957: # - %hostip - Indexed by hostid, the Ip address of the host.
4958: sub ReadHostTable {
4959:
4960: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
4961: my $myloncapaname = $perlvar{'lonHostID'};
4962: Debug("My loncapa name is : $myloncapaname");
4963: my %name_to_ip;
4964: while (my $configline=<CONFIG>) {
4965: if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {
4966: my ($id,$domain,$role,$name)=split(/:/,$configline);
4967: $name=~s/\s//g;
4968: my $ip;
4969: if (!exists($name_to_ip{$name})) {
4970: $ip = gethostbyname($name);
4971: if (!$ip || length($ip) ne 4) {
4972: &logthis("Skipping host $id name $name no IP found\n");
4973: next;
4974: }
4975: $ip=inet_ntoa($ip);
4976: $name_to_ip{$name} = $ip;
4977: } else {
4978: $ip = $name_to_ip{$name};
4979: }
4980: $hostid{$ip}=$id; # LonCAPA name of host by IP.
4981: $hostdom{$id}=$domain; # LonCAPA domain name of host.
4982: $hostname{$id}=$name; # LonCAPA name -> DNS name
4983: $hostip{$id}=$ip; # IP address of host.
4984: $hostdns{$name} = $id; # LonCAPA name of host by DNS.
4985:
4986: if ($id eq $perlvar{'lonHostID'}) {
4987: Debug("Found me in the host table: $name");
4988: $thisserver=$name;
4989: }
4990: }
4991: }
4992: close(CONFIG);
4993: }
4994: #
4995: # Reload the Apache daemon's state.
4996: # This is done by invoking /home/httpd/perl/apachereload
4997: # a setuid perl script that can be root for us to do this job.
4998: #
4999: sub ReloadApache {
5000: my $execdir = $perlvar{'lonDaemons'};
5001: my $script = $execdir."/apachereload";
5002: system($script);
5003: }
5004:
5005: #
5006: # Called in response to a USR2 signal.
5007: # - Reread hosts.tab
5008: # - All children connected to hosts that were removed from hosts.tab
5009: # are killed via SIGINT
5010: # - All children connected to previously existing hosts are sent SIGUSR1
5011: # - Our internal hosts hash is updated to reflect the new contents of
5012: # hosts.tab causing connections from hosts added to hosts.tab to
5013: # now be honored.
5014: #
5015: sub UpdateHosts {
5016: &status("Reload hosts.tab");
5017: logthis('<font color="blue"> Updating connections </font>');
5018: #
5019: # The %children hash has the set of IP's we currently have children
5020: # on. These need to be matched against records in the hosts.tab
5021: # Any ip's no longer in the table get killed off they correspond to
5022: # either dropped or changed hosts. Note that the re-read of the table
5023: # will take care of new and changed hosts as connections come into being.
5024:
5025:
5026: KillHostHashes;
5027: ReadHostTable;
5028:
5029: foreach my $child (keys %children) {
5030: my $childip = $children{$child};
5031: if(!$hostid{$childip}) {
5032: logthis('<font color="blue"> UpdateHosts killing child '
5033: ." $child for ip $childip </font>");
5034: kill('INT', $child);
5035: } else {
5036: logthis('<font color="green"> keeping child for ip '
5037: ." $childip (pid=$child) </font>");
5038: }
5039: }
5040: ReloadApache;
5041: &status("Finished reloading hosts.tab");
5042: }
5043:
5044:
5045: sub checkchildren {
5046: &status("Checking on the children (sending signals)");
5047: &initnewstatus();
5048: &logstatus();
5049: &logthis('Going to check on the children');
5050: my $docdir=$perlvar{'lonDocRoot'};
5051: foreach (sort keys %children) {
5052: #sleep 1;
5053: unless (kill 'USR1' => $_) {
5054: &logthis ('Child '.$_.' is dead');
5055: &logstatus($$.' is dead');
5056: delete($children{$_});
5057: }
5058: }
5059: sleep 5;
5060: $SIG{ALRM} = sub { Debug("timeout");
5061: die "timeout"; };
5062: $SIG{__DIE__} = 'DEFAULT';
5063: &status("Checking on the children (waiting for reports)");
5064: foreach (sort keys %children) {
5065: unless (-e "$docdir/lon-status/londchld/$_.txt") {
5066: eval {
5067: alarm(300);
5068: &logthis('Child '.$_.' did not respond');
5069: kill 9 => $_;
5070: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
5071: #$subj="LON: $currenthostid killed lond process $_";
5072: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
5073: #$execdir=$perlvar{'lonDaemons'};
5074: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
5075: delete($children{$_});
5076: alarm(0);
5077: }
5078: }
5079: }
5080: $SIG{ALRM} = 'DEFAULT';
5081: $SIG{__DIE__} = \&catchexception;
5082: &status("Finished checking children");
5083: &logthis('Finished Checking children');
5084: }
5085:
5086: # --------------------------------------------------------------------- Logging
5087:
5088: sub logthis {
5089: my $message=shift;
5090: my $execdir=$perlvar{'lonDaemons'};
5091: my $fh=IO::File->new(">>$execdir/logs/lond.log");
5092: my $now=time;
5093: my $local=localtime($now);
5094: $lastlog=$local.': '.$message;
5095: print $fh "$local ($$): $message\n";
5096: }
5097:
5098: # ------------------------- Conditional log if $DEBUG true.
5099: sub Debug {
5100: my $message = shift;
5101: if($DEBUG) {
5102: &logthis($message);
5103: }
5104: }
5105:
5106: #
5107: # Sub to do replies to client.. this gives a hook for some
5108: # debug tracing too:
5109: # Parameters:
5110: # fd - File open on client.
5111: # reply - Text to send to client.
5112: # request - Original request from client.
5113: #
5114: sub Reply {
5115: my ($fd, $reply, $request) = @_;
5116: print $fd $reply;
5117: Debug("Request was $request Reply was $reply");
5118:
5119: $Transactions++;
5120: }
5121:
5122:
5123: #
5124: # Sub to report a failure.
5125: # This function:
5126: # - Increments the failure statistic counters.
5127: # - Invokes Reply to send the error message to the client.
5128: # Parameters:
5129: # fd - File descriptor open on the client
5130: # reply - Reply text to emit.
5131: # request - The original request message (used by Reply
5132: # to debug if that's enabled.
5133: # Implicit outputs:
5134: # $Failures- The number of failures is incremented.
5135: # Reply (invoked here) sends a message to the
5136: # client:
5137: #
5138: sub Failure {
5139: my $fd = shift;
5140: my $reply = shift;
5141: my $request = shift;
5142:
5143: $Failures++;
5144: Reply($fd, $reply, $request); # That's simple eh?
5145: }
5146: # ------------------------------------------------------------------ Log status
5147:
5148: sub logstatus {
5149: &status("Doing logging");
5150: my $docdir=$perlvar{'lonDocRoot'};
5151: {
5152: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
5153: print $fh $status."\n".$lastlog."\n".time."\n$keymode";
5154: $fh->close();
5155: }
5156: &status("Finished $$.txt");
5157: {
5158: open(LOG,">>$docdir/lon-status/londstatus.txt");
5159: flock(LOG,LOCK_EX);
5160: print LOG $$."\t".$clientname."\t".$currenthostid."\t"
5161: .$status."\t".$lastlog."\t $keymode\n";
5162: flock(LOG,LOCK_UN);
5163: close(LOG);
5164: }
5165: &status("Finished logging");
5166: }
5167:
5168: sub initnewstatus {
5169: my $docdir=$perlvar{'lonDocRoot'};
5170: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
5171: my $now=time;
5172: my $local=localtime($now);
5173: print $fh "LOND status $local - parent $$\n\n";
5174: opendir(DIR,"$docdir/lon-status/londchld");
5175: while (my $filename=readdir(DIR)) {
5176: unlink("$docdir/lon-status/londchld/$filename");
5177: }
5178: closedir(DIR);
5179: }
5180:
5181: # -------------------------------------------------------------- Status setting
5182:
5183: sub status {
5184: my $what=shift;
5185: my $now=time;
5186: my $local=localtime($now);
5187: $status=$local.': '.$what;
5188: $0='lond: '.$what.' '.$local;
5189: }
5190:
5191: # ----------------------------------------------------------- Send USR1 to lonc
5192:
5193: sub reconlonc {
5194: my $peerfile=shift;
5195: &logthis("Trying to reconnect for $peerfile");
5196: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
5197: if (my $fh=IO::File->new("$loncfile")) {
5198: my $loncpid=<$fh>;
5199: chomp($loncpid);
5200: if (kill 0 => $loncpid) {
5201: &logthis("lonc at pid $loncpid responding, sending USR1");
5202: kill USR1 => $loncpid;
5203: } else {
5204: &logthis(
5205: "<font color='red'>CRITICAL: "
5206: ."lonc at pid $loncpid not responding, giving up</font>");
5207: }
5208: } else {
5209: &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
5210: }
5211: }
5212:
5213: # -------------------------------------------------- Non-critical communication
5214:
5215: sub subreply {
5216: my ($cmd,$server)=@_;
5217: my $peerfile="$perlvar{'lonSockDir'}/".$hostname{$server};
5218: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
5219: Type => SOCK_STREAM,
5220: Timeout => 10)
5221: or return "con_lost";
5222: print $sclient "sethost:$server:$cmd\n";
5223: my $answer=<$sclient>;
5224: chomp($answer);
5225: if (!$answer) { $answer="con_lost"; }
5226: return $answer;
5227: }
5228:
5229: sub reply {
5230: my ($cmd,$server)=@_;
5231: my $answer;
5232: if ($server ne $currenthostid) {
5233: $answer=subreply($cmd,$server);
5234: if ($answer eq 'con_lost') {
5235: $answer=subreply("ping",$server);
5236: if ($answer ne $server) {
5237: &logthis("sub reply: answer != server answer is $answer, server is $server");
5238: &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$server});
5239: }
5240: $answer=subreply($cmd,$server);
5241: }
5242: } else {
5243: $answer='self_reply';
5244: }
5245: return $answer;
5246: }
5247:
5248: # -------------------------------------------------------------- Talk to lonsql
5249:
5250: sub sql_reply {
5251: my ($cmd)=@_;
5252: my $answer=&sub_sql_reply($cmd);
5253: if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
5254: return $answer;
5255: }
5256:
5257: sub sub_sql_reply {
5258: my ($cmd)=@_;
5259: my $unixsock="mysqlsock";
5260: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
5261: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
5262: Type => SOCK_STREAM,
5263: Timeout => 10)
5264: or return "con_lost";
5265: print $sclient "$cmd:$currentdomainid\n";
5266: my $answer=<$sclient>;
5267: chomp($answer);
5268: if (!$answer) { $answer="con_lost"; }
5269: return $answer;
5270: }
5271:
5272: # -------------------------------------------- Return path to profile directory
5273:
5274: sub propath {
5275: my ($udom,$uname)=@_;
5276: $udom=~s/\W//g;
5277: $uname=~s/\W//g;
5278: my $subdir=$uname.'__';
5279: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
5280: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
5281: return $proname;
5282: }
5283:
5284: # --------------------------------------- Is this the home server of an author?
5285:
5286: sub ishome {
5287: my $author=shift;
5288: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
5289: my ($udom,$uname)=split(/\//,$author);
5290: my $proname=propath($udom,$uname);
5291: if (-e $proname) {
5292: return 'owner';
5293: } else {
5294: return 'not_owner';
5295: }
5296: }
5297:
5298: # ======================================================= Continue main program
5299: # ---------------------------------------------------- Fork once and dissociate
5300:
5301: my $fpid=fork;
5302: exit if $fpid;
5303: die "Couldn't fork: $!" unless defined ($fpid);
5304:
5305: POSIX::setsid() or die "Can't start new session: $!";
5306:
5307: # ------------------------------------------------------- Write our PID on disk
5308:
5309: my $execdir=$perlvar{'lonDaemons'};
5310: open (PIDSAVE,">$execdir/logs/lond.pid");
5311: print PIDSAVE "$$\n";
5312: close(PIDSAVE);
5313: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
5314: &status('Starting');
5315:
5316:
5317:
5318: # ----------------------------------------------------- Install signal handlers
5319:
5320:
5321: $SIG{CHLD} = \&REAPER;
5322: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
5323: $SIG{HUP} = \&HUPSMAN;
5324: $SIG{USR1} = \&checkchildren;
5325: $SIG{USR2} = \&UpdateHosts;
5326:
5327: # Read the host hashes:
5328:
5329: ReadHostTable;
5330:
5331: my $dist=`$perlvar{'lonDaemons'}/distprobe`;
5332:
5333: # --------------------------------------------------------------
5334: # Accept connections. When a connection comes in, it is validated
5335: # and if good, a child process is created to process transactions
5336: # along the connection.
5337:
5338: while (1) {
5339: &status('Starting accept');
5340: $client = $server->accept() or next;
5341: &status('Accepted '.$client.' off to spawn');
5342: make_new_child($client);
5343: &status('Finished spawning');
5344: }
5345:
5346: sub make_new_child {
5347: my $pid;
5348: # my $cipher; # Now global
5349: my $sigset;
5350:
5351: $client = shift;
5352: &status('Starting new child '.$client);
5353: &logthis('<font color="green"> Attempting to start child ('.$client.
5354: ")</font>");
5355: # block signal for fork
5356: $sigset = POSIX::SigSet->new(SIGINT);
5357: sigprocmask(SIG_BLOCK, $sigset)
5358: or die "Can't block SIGINT for fork: $!\n";
5359:
5360: die "fork: $!" unless defined ($pid = fork);
5361:
5362: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
5363: # connection liveness.
5364:
5365: #
5366: # Figure out who we're talking to so we can record the peer in
5367: # the pid hash.
5368: #
5369: my $caller = getpeername($client);
5370: my ($port,$iaddr);
5371: if (defined($caller) && length($caller) > 0) {
5372: ($port,$iaddr)=unpack_sockaddr_in($caller);
5373: } else {
5374: &logthis("Unable to determine who caller was, getpeername returned nothing");
5375: }
5376: if (defined($iaddr)) {
5377: $clientip = inet_ntoa($iaddr);
5378: Debug("Connected with $clientip");
5379: } else {
5380: &logthis("Unable to determine clientip");
5381: $clientip='Unavailable';
5382: }
5383:
5384: if ($pid) {
5385: # Parent records the child's birth and returns.
5386: sigprocmask(SIG_UNBLOCK, $sigset)
5387: or die "Can't unblock SIGINT for fork: $!\n";
5388: $children{$pid} = $clientip;
5389: &status('Started child '.$pid);
5390: return;
5391: } else {
5392: # Child can *not* return from this subroutine.
5393: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
5394: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
5395: #don't get intercepted
5396: $SIG{USR1}= \&logstatus;
5397: $SIG{ALRM}= \&timeout;
5398: $lastlog='Forked ';
5399: $status='Forked';
5400:
5401: # unblock signals
5402: sigprocmask(SIG_UNBLOCK, $sigset)
5403: or die "Can't unblock SIGINT for fork: $!\n";
5404:
5405: # my $tmpsnum=0; # Now global
5406: #---------------------------------------------------- kerberos 5 initialization
5407: &Authen::Krb5::init_context();
5408: unless (($dist eq 'fedora4') || ($dist eq 'suse9.3')) {
5409: &Authen::Krb5::init_ets();
5410: }
5411:
5412: &status('Accepted connection');
5413: # =============================================================================
5414: # do something with the connection
5415: # -----------------------------------------------------------------------------
5416: # see if we know client and 'check' for spoof IP by ineffective challenge
5417:
5418: ReadManagerTable; # May also be a manager!!
5419:
5420: my $outsideip=$clientip;
5421: if ($clientip eq '127.0.0.1') {
5422: $outsideip=$hostip{$perlvar{'lonHostID'}};
5423: }
5424:
5425: my $clientrec=($hostid{$outsideip} ne undef);
5426: my $ismanager=($managers{$outsideip} ne undef);
5427: $clientname = "[unknonwn]";
5428: if($clientrec) { # Establish client type.
5429: $ConnectionType = "client";
5430: $clientname = $hostid{$outsideip};
5431: if($ismanager) {
5432: $ConnectionType = "both";
5433: }
5434: } else {
5435: $ConnectionType = "manager";
5436: $clientname = $managers{$outsideip};
5437: }
5438: my $clientok;
5439:
5440: if ($clientrec || $ismanager) {
5441: &status("Waiting for init from $clientip $clientname");
5442: &logthis('<font color="yellow">INFO: Connection, '.
5443: $clientip.
5444: " ($clientname) connection type = $ConnectionType </font>" );
5445: &status("Connecting $clientip ($clientname))");
5446: my $remotereq=<$client>;
5447: chomp($remotereq);
5448: Debug("Got init: $remotereq");
5449: my $inikeyword = split(/:/, $remotereq);
5450: if ($remotereq =~ /^init/) {
5451: &sethost("sethost:$perlvar{'lonHostID'}");
5452: #
5453: # If the remote is attempting a local init... give that a try:
5454: #
5455: my ($i, $inittype) = split(/:/, $remotereq);
5456:
5457: # If the connection type is ssl, but I didn't get my
5458: # certificate files yet, then I'll drop back to
5459: # insecure (if allowed).
5460:
5461: if($inittype eq "ssl") {
5462: my ($ca, $cert) = lonssl::CertificateFile;
5463: my $kfile = lonssl::KeyFile;
5464: if((!$ca) ||
5465: (!$cert) ||
5466: (!$kfile)) {
5467: $inittype = ""; # This forces insecure attempt.
5468: &logthis("<font color=\"blue\"> Certificates not "
5469: ."installed -- trying insecure auth</font>");
5470: } else { # SSL certificates are in place so
5471: } # Leave the inittype alone.
5472: }
5473:
5474: if($inittype eq "local") {
5475: my $key = LocalConnection($client, $remotereq);
5476: if($key) {
5477: Debug("Got local key $key");
5478: $clientok = 1;
5479: my $cipherkey = pack("H32", $key);
5480: $cipher = new IDEA($cipherkey);
5481: print $client "ok:local\n";
5482: &logthis('<font color="green"'
5483: . "Successful local authentication </font>");
5484: $keymode = "local"
5485: } else {
5486: Debug("Failed to get local key");
5487: $clientok = 0;
5488: shutdown($client, 3);
5489: close $client;
5490: }
5491: } elsif ($inittype eq "ssl") {
5492: my $key = SSLConnection($client);
5493: if ($key) {
5494: $clientok = 1;
5495: my $cipherkey = pack("H32", $key);
5496: $cipher = new IDEA($cipherkey);
5497: &logthis('<font color="green">'
5498: ."Successfull ssl authentication with $clientname </font>");
5499: $keymode = "ssl";
5500:
5501: } else {
5502: $clientok = 0;
5503: close $client;
5504: }
5505:
5506: } else {
5507: my $ok = InsecureConnection($client);
5508: if($ok) {
5509: $clientok = 1;
5510: &logthis('<font color="green">'
5511: ."Successful insecure authentication with $clientname </font>");
5512: print $client "ok\n";
5513: $keymode = "insecure";
5514: } else {
5515: &logthis('<font color="yellow">'
5516: ."Attempted insecure connection disallowed </font>");
5517: close $client;
5518: $clientok = 0;
5519:
5520: }
5521: }
5522: } else {
5523: &logthis(
5524: "<font color='blue'>WARNING: "
5525: ."$clientip failed to initialize: >$remotereq< </font>");
5526: &status('No init '.$clientip);
5527: }
5528:
5529: } else {
5530: &logthis(
5531: "<font color='blue'>WARNING: Unknown client $clientip</font>");
5532: &status('Hung up on '.$clientip);
5533: }
5534:
5535: if ($clientok) {
5536: # ---------------- New known client connecting, could mean machine online again
5537:
5538: foreach my $id (keys(%hostip)) {
5539: if ($hostip{$id} ne $clientip ||
5540: $hostip{$currenthostid} eq $clientip) {
5541: # no need to try to do recon's to myself
5542: next;
5543: }
5544: &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$id});
5545: }
5546: &logthis("<font color='green'>Established connection: $clientname</font>");
5547: &status('Will listen to '.$clientname);
5548: # ------------------------------------------------------------ Process requests
5549: my $keep_going = 1;
5550: my $user_input;
5551: while(($user_input = get_request) && $keep_going) {
5552: alarm(120);
5553: Debug("Main: Got $user_input\n");
5554: $keep_going = &process_request($user_input);
5555: alarm(0);
5556: &status('Listening to '.$clientname." ($keymode)");
5557: }
5558:
5559: # --------------------------------------------- client unknown or fishy, refuse
5560: } else {
5561: print $client "refused\n";
5562: $client->close();
5563: &logthis("<font color='blue'>WARNING: "
5564: ."Rejected client $clientip, closing connection</font>");
5565: }
5566: }
5567:
5568: # =============================================================================
5569:
5570: &logthis("<font color='red'>CRITICAL: "
5571: ."Disconnect from $clientip ($clientname)</font>");
5572:
5573:
5574: # this exit is VERY important, otherwise the child will become
5575: # a producer of more and more children, forking yourself into
5576: # process death.
5577: exit;
5578:
5579: }
5580: #
5581: # Determine if a user is an author for the indicated domain.
5582: #
5583: # Parameters:
5584: # domain - domain to check in .
5585: # user - Name of user to check.
5586: #
5587: # Return:
5588: # 1 - User is an author for domain.
5589: # 0 - User is not an author for domain.
5590: sub is_author {
5591: my ($domain, $user) = @_;
5592:
5593: &Debug("is_author: $user @ $domain");
5594:
5595: my $hashref = &tie_user_hash($domain, $user, "roles",
5596: &GDBM_READER());
5597:
5598: # Author role should show up as a key /domain/_au
5599:
5600: my $key = "/$domain/_au";
5601: my $value;
5602: if (defined($hashref)) {
5603: $value = $hashref->{$key};
5604: }
5605:
5606: if(defined($value)) {
5607: &Debug("$user @ $domain is an author");
5608: }
5609:
5610: return defined($value);
5611: }
5612: #
5613: # Checks to see if the input roleput request was to set
5614: # an author role. If so, invokes the lchtmldir script to set
5615: # up a correct public_html
5616: # Parameters:
5617: # request - The request sent to the rolesput subchunk.
5618: # We're looking for /domain/_au
5619: # domain - The domain in which the user is having roles doctored.
5620: # user - Name of the user for which the role is being put.
5621: # authtype - The authentication type associated with the user.
5622: #
5623: sub manage_permissions {
5624: my ($request, $domain, $user, $authtype) = @_;
5625:
5626: &Debug("manage_permissions: $request $domain $user $authtype");
5627:
5628: # See if the request is of the form /$domain/_au
5629: if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
5630: my $execdir = $perlvar{'lonDaemons'};
5631: my $userhome= "/home/$user" ;
5632: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
5633: &Debug("Setting homedir permissions for $userhome");
5634: system("$execdir/lchtmldir $userhome $user $authtype");
5635: }
5636: }
5637:
5638:
5639: #
5640: # Return the full path of a user password file, whether it exists or not.
5641: # Parameters:
5642: # domain - Domain in which the password file lives.
5643: # user - name of the user.
5644: # Returns:
5645: # Full passwd path:
5646: #
5647: sub password_path {
5648: my ($domain, $user) = @_;
5649: return &propath($domain, $user).'/passwd';
5650: }
5651:
5652: # Password Filename
5653: # Returns the path to a passwd file given domain and user... only if
5654: # it exists.
5655: # Parameters:
5656: # domain - Domain in which to search.
5657: # user - username.
5658: # Returns:
5659: # - If the password file exists returns its path.
5660: # - If the password file does not exist, returns undefined.
5661: #
5662: sub password_filename {
5663: my ($domain, $user) = @_;
5664:
5665: Debug ("PasswordFilename called: dom = $domain user = $user");
5666:
5667: my $path = &password_path($domain, $user);
5668: Debug("PasswordFilename got path: $path");
5669: if(-e $path) {
5670: return $path;
5671: } else {
5672: return undef;
5673: }
5674: }
5675:
5676: #
5677: # Rewrite the contents of the user's passwd file.
5678: # Parameters:
5679: # domain - domain of the user.
5680: # name - User's name.
5681: # contents - New contents of the file.
5682: # Returns:
5683: # 0 - Failed.
5684: # 1 - Success.
5685: #
5686: sub rewrite_password_file {
5687: my ($domain, $user, $contents) = @_;
5688:
5689: my $file = &password_filename($domain, $user);
5690: if (defined $file) {
5691: my $pf = IO::File->new(">$file");
5692: if($pf) {
5693: print $pf "$contents\n";
5694: return 1;
5695: } else {
5696: return 0;
5697: }
5698: } else {
5699: return 0;
5700: }
5701:
5702: }
5703:
5704: #
5705: # get_auth_type - Determines the authorization type of a user in a domain.
5706:
5707: # Returns the authorization type or nouser if there is no such user.
5708: #
5709: sub get_auth_type
5710: {
5711:
5712: my ($domain, $user) = @_;
5713:
5714: Debug("get_auth_type( $domain, $user ) \n");
5715: my $proname = &propath($domain, $user);
5716: my $passwdfile = "$proname/passwd";
5717: if( -e $passwdfile ) {
5718: my $pf = IO::File->new($passwdfile);
5719: my $realpassword = <$pf>;
5720: chomp($realpassword);
5721: Debug("Password info = $realpassword\n");
5722: my ($authtype, $contentpwd) = split(/:/, $realpassword);
5723: Debug("Authtype = $authtype, content = $contentpwd\n");
5724: return "$authtype:$contentpwd";
5725: } else {
5726: Debug("Returning nouser");
5727: return "nouser";
5728: }
5729: }
5730:
5731: #
5732: # Validate a user given their domain, name and password. This utility
5733: # function is used by both AuthenticateHandler and ChangePasswordHandler
5734: # to validate the login credentials of a user.
5735: # Parameters:
5736: # $domain - The domain being logged into (this is required due to
5737: # the capability for multihomed systems.
5738: # $user - The name of the user being validated.
5739: # $password - The user's propoposed password.
5740: #
5741: # Returns:
5742: # 1 - The domain,user,pasword triplet corresponds to a valid
5743: # user.
5744: # 0 - The domain,user,password triplet is not a valid user.
5745: #
5746: sub validate_user {
5747: my ($domain, $user, $password) = @_;
5748:
5749:
5750: # Why negative ~pi you may well ask? Well this function is about
5751: # authentication, and therefore very important to get right.
5752: # I've initialized the flag that determines whether or not I've
5753: # validated correctly to a value it's not supposed to get.
5754: # At the end of this function. I'll ensure that it's not still that
5755: # value so we don't just wind up returning some accidental value
5756: # as a result of executing an unforseen code path that
5757: # did not set $validated. At the end of valid execution paths,
5758: # validated shoule be 1 for success or 0 for failuer.
5759:
5760: my $validated = -3.14159;
5761:
5762: # How we authenticate is determined by the type of authentication
5763: # the user has been assigned. If the authentication type is
5764: # "nouser", the user does not exist so we will return 0.
5765:
5766: my $contents = &get_auth_type($domain, $user);
5767: my ($howpwd, $contentpwd) = split(/:/, $contents);
5768:
5769: my $null = pack("C",0); # Used by kerberos auth types.
5770:
5771: if ($howpwd ne 'nouser') {
5772:
5773: if($howpwd eq "internal") { # Encrypted is in local password file.
5774: $validated = (crypt($password, $contentpwd) eq $contentpwd);
5775: }
5776: elsif ($howpwd eq "unix") { # User is a normal unix user.
5777: $contentpwd = (getpwnam($user))[1];
5778: if($contentpwd) {
5779: if($contentpwd eq 'x') { # Shadow password file...
5780: my $pwauth_path = "/usr/local/sbin/pwauth";
5781: open PWAUTH, "|$pwauth_path" or
5782: die "Cannot invoke authentication";
5783: print PWAUTH "$user\n$password\n";
5784: close PWAUTH;
5785: $validated = ! $?;
5786:
5787: } else { # Passwords in /etc/passwd.
5788: $validated = (crypt($password,
5789: $contentpwd) eq $contentpwd);
5790: }
5791: } else {
5792: $validated = 0;
5793: }
5794: }
5795: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
5796: if(! ($password =~ /$null/) ) {
5797: my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
5798: "",
5799: $contentpwd,,
5800: 'krbtgt',
5801: $contentpwd,
5802: 1,
5803: $password);
5804: if(!$k4error) {
5805: $validated = 1;
5806: } else {
5807: $validated = 0;
5808: &logthis('krb4: '.$user.', '.$contentpwd.', '.
5809: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
5810: }
5811: } else {
5812: $validated = 0; # Password has a match with null.
5813: }
5814: } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
5815: if(!($password =~ /$null/)) { # Null password not allowed.
5816: my $krbclient = &Authen::Krb5::parse_name($user.'@'
5817: .$contentpwd);
5818: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
5819: my $krbserver = &Authen::Krb5::parse_name($krbservice);
5820: my $credentials= &Authen::Krb5::cc_default();
5821: $credentials->initialize($krbclient);
5822: my $krbreturn = &Authen::Krb5::get_in_tkt_with_password($krbclient,
5823: $krbserver,
5824: $password,
5825: $credentials);
5826: $validated = ($krbreturn == 1);
5827: } else {
5828: $validated = 0;
5829: }
5830: } elsif ($howpwd eq "localauth") {
5831: # Authenticate via installation specific authentcation method:
5832: $validated = &localauth::localauth($user,
5833: $password,
5834: $contentpwd);
5835: } else { # Unrecognized auth is also bad.
5836: $validated = 0;
5837: }
5838: } else {
5839: $validated = 0;
5840: }
5841: #
5842: # $validated has the correct stat of the authentication:
5843: #
5844:
5845: unless ($validated != -3.14159) {
5846: # I >really really< want to know if this happens.
5847: # since it indicates that user authentication is badly
5848: # broken in some code path.
5849: #
5850: die "ValidateUser - failed to set the value of validated $domain, $user $password";
5851: }
5852: return $validated;
5853: }
5854:
5855:
5856: sub addline {
5857: my ($fname,$hostid,$ip,$newline)=@_;
5858: my $contents;
5859: my $found=0;
5860: my $expr='^'.$hostid.':'.$ip.':';
5861: $expr =~ s/\./\\\./g;
5862: my $sh;
5863: if ($sh=IO::File->new("$fname.subscription")) {
5864: while (my $subline=<$sh>) {
5865: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
5866: }
5867: $sh->close();
5868: }
5869: $sh=IO::File->new(">$fname.subscription");
5870: if ($contents) { print $sh $contents; }
5871: if ($newline) { print $sh $newline; }
5872: $sh->close();
5873: return $found;
5874: }
5875:
5876: sub get_chat {
5877: my ($cdom,$cname,$udom,$uname,$group)=@_;
5878:
5879: my @entries=();
5880: my $namespace = 'nohist_chatroom';
5881: my $namespace_inroom = 'nohist_inchatroom';
5882: if (defined($group)) {
5883: $namespace .= '_'.$group;
5884: $namespace_inroom .= '_'.$group;
5885: }
5886: my $hashref = &tie_user_hash($cdom, $cname, $namespace,
5887: &GDBM_READER());
5888: if ($hashref) {
5889: @entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
5890: &untie_user_hash($hashref);
5891: }
5892: my @participants=();
5893: my $cutoff=time-60;
5894: $hashref = &tie_user_hash($cdom, $cname, $namespace_inroom,
5895: &GDBM_WRCREAT());
5896: if ($hashref) {
5897: $hashref->{$uname.':'.$udom}=time;
5898: foreach my $user (sort(keys(%$hashref))) {
5899: if ($hashref->{$user}>$cutoff) {
5900: push(@participants, 'active_participant:'.$user);
5901: }
5902: }
5903: &untie_user_hash($hashref);
5904: }
5905: return (@participants,@entries);
5906: }
5907:
5908: sub chat_add {
5909: my ($cdom,$cname,$newchat,$group)=@_;
5910: my @entries=();
5911: my $time=time;
5912: my $namespace = 'nohist_chatroom';
5913: my $logfile = 'chatroom.log';
5914: if (defined($group)) {
5915: $namespace .= '_'.$group;
5916: $logfile = 'chatroom_'.$group.'.log';
5917: }
5918: my $hashref = &tie_user_hash($cdom, $cname, $namespace,
5919: &GDBM_WRCREAT());
5920: if ($hashref) {
5921: @entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
5922: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
5923: my ($thentime,$idnum)=split(/\_/,$lastid);
5924: my $newid=$time.'_000000';
5925: if ($thentime==$time) {
5926: $idnum=~s/^0+//;
5927: $idnum++;
5928: $idnum=substr('000000'.$idnum,-6,6);
5929: $newid=$time.'_'.$idnum;
5930: }
5931: $hashref->{$newid}=$newchat;
5932: my $expired=$time-3600;
5933: foreach my $comment (keys(%$hashref)) {
5934: my ($thistime) = ($comment=~/(\d+)\_/);
5935: if ($thistime<$expired) {
5936: delete $hashref->{$comment};
5937: }
5938: }
5939: {
5940: my $proname=&propath($cdom,$cname);
5941: if (open(CHATLOG,">>$proname/$logfile")) {
5942: print CHATLOG ("$time:".&unescape($newchat)."\n");
5943: }
5944: close(CHATLOG);
5945: }
5946: &untie_user_hash($hashref);
5947: }
5948: }
5949:
5950: sub unsub {
5951: my ($fname,$clientip)=@_;
5952: my $result;
5953: my $unsubs = 0; # Number of successful unsubscribes:
5954:
5955:
5956: # An old way subscriptions were handled was to have a
5957: # subscription marker file:
5958:
5959: Debug("Attempting unlink of $fname.$clientname");
5960: if (unlink("$fname.$clientname")) {
5961: $unsubs++; # Successful unsub via marker file.
5962: }
5963:
5964: # The more modern way to do it is to have a subscription list
5965: # file:
5966:
5967: if (-e "$fname.subscription") {
5968: my $found=&addline($fname,$clientname,$clientip,'');
5969: if ($found) {
5970: $unsubs++;
5971: }
5972: }
5973:
5974: # If either or both of these mechanisms succeeded in unsubscribing a
5975: # resource we can return ok:
5976:
5977: if($unsubs) {
5978: $result = "ok\n";
5979: } else {
5980: $result = "not_subscribed\n";
5981: }
5982:
5983: return $result;
5984: }
5985:
5986: sub currentversion {
5987: my $fname=shift;
5988: my $version=-1;
5989: my $ulsdir='';
5990: if ($fname=~/^(.+)\/[^\/]+$/) {
5991: $ulsdir=$1;
5992: }
5993: my ($fnamere1,$fnamere2);
5994: # remove version if already specified
5995: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
5996: # get the bits that go before and after the version number
5997: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
5998: $fnamere1=$1;
5999: $fnamere2='.'.$2;
6000: }
6001: if (-e $fname) { $version=1; }
6002: if (-e $ulsdir) {
6003: if(-d $ulsdir) {
6004: if (opendir(LSDIR,$ulsdir)) {
6005: my $ulsfn;
6006: while ($ulsfn=readdir(LSDIR)) {
6007: # see if this is a regular file (ignore links produced earlier)
6008: my $thisfile=$ulsdir.'/'.$ulsfn;
6009: unless (-l $thisfile) {
6010: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
6011: if ($1>$version) { $version=$1; }
6012: }
6013: }
6014: }
6015: closedir(LSDIR);
6016: $version++;
6017: }
6018: }
6019: }
6020: return $version;
6021: }
6022:
6023: sub thisversion {
6024: my $fname=shift;
6025: my $version=-1;
6026: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
6027: $version=$1;
6028: }
6029: return $version;
6030: }
6031:
6032: sub subscribe {
6033: my ($userinput,$clientip)=@_;
6034: my $result;
6035: my ($cmd,$fname)=split(/:/,$userinput,2);
6036: my $ownership=&ishome($fname);
6037: if ($ownership eq 'owner') {
6038: # explitly asking for the current version?
6039: unless (-e $fname) {
6040: my $currentversion=¤tversion($fname);
6041: if (&thisversion($fname)==$currentversion) {
6042: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
6043: my $root=$1;
6044: my $extension=$2;
6045: symlink($root.'.'.$extension,
6046: $root.'.'.$currentversion.'.'.$extension);
6047: unless ($extension=~/\.meta$/) {
6048: symlink($root.'.'.$extension.'.meta',
6049: $root.'.'.$currentversion.'.'.$extension.'.meta');
6050: }
6051: }
6052: }
6053: }
6054: if (-e $fname) {
6055: if (-d $fname) {
6056: $result="directory\n";
6057: } else {
6058: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
6059: my $now=time;
6060: my $found=&addline($fname,$clientname,$clientip,
6061: "$clientname:$clientip:$now\n");
6062: if ($found) { $result="$fname\n"; }
6063: # if they were subscribed to only meta data, delete that
6064: # subscription, when you subscribe to a file you also get
6065: # the metadata
6066: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
6067: $fname=~s/\/home\/httpd\/html\/res/raw/;
6068: $fname="http://$thisserver/".$fname;
6069: $result="$fname\n";
6070: }
6071: } else {
6072: $result="not_found\n";
6073: }
6074: } else {
6075: $result="rejected\n";
6076: }
6077: return $result;
6078: }
6079: # Change the passwd of a unix user. The caller must have
6080: # first verified that the user is a loncapa user.
6081: #
6082: # Parameters:
6083: # user - Unix user name to change.
6084: # pass - New password for the user.
6085: # Returns:
6086: # ok - if success
6087: # other - Some meaningfule error message string.
6088: # NOTE:
6089: # invokes a setuid script to change the passwd.
6090: sub change_unix_password {
6091: my ($user, $pass) = @_;
6092:
6093: &Debug("change_unix_password");
6094: my $execdir=$perlvar{'lonDaemons'};
6095: &Debug("Opening lcpasswd pipeline");
6096: my $pf = IO::File->new("|$execdir/lcpasswd > "
6097: ."$perlvar{'lonDaemons'}"
6098: ."/logs/lcpasswd.log");
6099: print $pf "$user\n$pass\n$pass\n";
6100: close $pf;
6101: my $err = $?;
6102: return ($err < @passwderrors) ? $passwderrors[$err] :
6103: "pwchange_falure - unknown error";
6104:
6105:
6106: }
6107:
6108:
6109: sub make_passwd_file {
6110: my ($uname, $umode,$npass,$passfilename)=@_;
6111: my $result="ok\n";
6112: if ($umode eq 'krb4' or $umode eq 'krb5') {
6113: {
6114: my $pf = IO::File->new(">$passfilename");
6115: if ($pf) {
6116: print $pf "$umode:$npass\n";
6117: } else {
6118: $result = "pass_file_failed_error";
6119: }
6120: }
6121: } elsif ($umode eq 'internal') {
6122: my $salt=time;
6123: $salt=substr($salt,6,2);
6124: my $ncpass=crypt($npass,$salt);
6125: {
6126: &Debug("Creating internal auth");
6127: my $pf = IO::File->new(">$passfilename");
6128: if($pf) {
6129: print $pf "internal:$ncpass\n";
6130: } else {
6131: $result = "pass_file_failed_error";
6132: }
6133: }
6134: } elsif ($umode eq 'localauth') {
6135: {
6136: my $pf = IO::File->new(">$passfilename");
6137: if($pf) {
6138: print $pf "localauth:$npass\n";
6139: } else {
6140: $result = "pass_file_failed_error";
6141: }
6142: }
6143: } elsif ($umode eq 'unix') {
6144: {
6145: #
6146: # Don't allow the creation of privileged accounts!!! that would
6147: # be real bad!!!
6148: #
6149: my $uid = getpwnam($uname);
6150: if((defined $uid) && ($uid == 0)) {
6151: &logthis(">>>Attempted to create privilged account blocked");
6152: return "no_priv_account_error\n";
6153: }
6154:
6155: my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd";
6156:
6157: my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status";
6158: {
6159: &Debug("Executing external: ".$execpath);
6160: &Debug("user = ".$uname.", Password =". $npass);
6161: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
6162: print $se "$uname\n";
6163: print $se "$npass\n";
6164: print $se "$npass\n";
6165: print $se "$lc_error_file\n"; # Status -> unique file.
6166: }
6167: if (-r $lc_error_file) {
6168: &Debug("Opening error file: $lc_error_file");
6169: my $error = IO::File->new("< $lc_error_file");
6170: my $useraddok = <$error>;
6171: $error->close;
6172: unlink($lc_error_file);
6173:
6174: chomp $useraddok;
6175:
6176: if($useraddok > 0) {
6177: my $error_text = &lcuseraddstrerror($useraddok);
6178: &logthis("Failed lcuseradd: $error_text");
6179: $result = "lcuseradd_failed:$error_text\n";
6180: } else {
6181: my $pf = IO::File->new(">$passfilename");
6182: if($pf) {
6183: print $pf "unix:\n";
6184: } else {
6185: $result = "pass_file_failed_error";
6186: }
6187: }
6188: } else {
6189: &Debug("Could not locate lcuseradd error: $lc_error_file");
6190: $result="bug_lcuseradd_no_output_file";
6191: }
6192: }
6193: } elsif ($umode eq 'none') {
6194: {
6195: my $pf = IO::File->new("> $passfilename");
6196: if($pf) {
6197: print $pf "none:\n";
6198: } else {
6199: $result = "pass_file_failed_error";
6200: }
6201: }
6202: } else {
6203: $result="auth_mode_error\n";
6204: }
6205: return $result;
6206: }
6207:
6208: sub convert_photo {
6209: my ($start,$dest)=@_;
6210: system("convert $start $dest");
6211: }
6212:
6213: sub sethost {
6214: my ($remotereq) = @_;
6215: my (undef,$hostid)=split(/:/,$remotereq);
6216: # ignore sethost if we are already correct
6217: if ($hostid eq $currenthostid) {
6218: return 'ok';
6219: }
6220:
6221: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
6222: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
6223: $currenthostid =$hostid;
6224: $currentdomainid=$hostdom{$hostid};
6225: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
6226: } else {
6227: &logthis("Requested host id $hostid not an alias of ".
6228: $perlvar{'lonHostID'}." refusing connection");
6229: return 'unable_to_set';
6230: }
6231: return 'ok';
6232: }
6233:
6234: sub version {
6235: my ($userinput)=@_;
6236: $remoteVERSION=(split(/:/,$userinput))[1];
6237: return "version:$VERSION";
6238: }
6239:
6240: #There is a copy of this in lonnet.pm
6241: sub userload {
6242: my $numusers=0;
6243: {
6244: opendir(LONIDS,$perlvar{'lonIDsDir'});
6245: my $filename;
6246: my $curtime=time;
6247: while ($filename=readdir(LONIDS)) {
6248: if ($filename eq '.' || $filename eq '..') {next;}
6249: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
6250: if ($curtime-$mtime < 1800) { $numusers++; }
6251: }
6252: closedir(LONIDS);
6253: }
6254: my $userloadpercent=0;
6255: my $maxuserload=$perlvar{'lonUserLoadLim'};
6256: if ($maxuserload) {
6257: $userloadpercent=100*$numusers/$maxuserload;
6258: }
6259: $userloadpercent=sprintf("%.2f",$userloadpercent);
6260: return $userloadpercent;
6261: }
6262:
6263: # Routines for serializing arrays and hashes (copies from lonnet)
6264:
6265: sub array2str {
6266: my (@array) = @_;
6267: my $result=&arrayref2str(\@array);
6268: $result=~s/^__ARRAY_REF__//;
6269: $result=~s/__END_ARRAY_REF__$//;
6270: return $result;
6271: }
6272:
6273: sub arrayref2str {
6274: my ($arrayref) = @_;
6275: my $result='__ARRAY_REF__';
6276: foreach my $elem (@$arrayref) {
6277: if(ref($elem) eq 'ARRAY') {
6278: $result.=&arrayref2str($elem).'&';
6279: } elsif(ref($elem) eq 'HASH') {
6280: $result.=&hashref2str($elem).'&';
6281: } elsif(ref($elem)) {
6282: #print("Got a ref of ".(ref($elem))." skipping.");
6283: } else {
6284: $result.=&escape($elem).'&';
6285: }
6286: }
6287: $result=~s/\&$//;
6288: $result .= '__END_ARRAY_REF__';
6289: return $result;
6290: }
6291:
6292: sub hash2str {
6293: my (%hash) = @_;
6294: my $result=&hashref2str(\%hash);
6295: $result=~s/^__HASH_REF__//;
6296: $result=~s/__END_HASH_REF__$//;
6297: return $result;
6298: }
6299:
6300: sub hashref2str {
6301: my ($hashref)=@_;
6302: my $result='__HASH_REF__';
6303: foreach (sort(keys(%$hashref))) {
6304: if (ref($_) eq 'ARRAY') {
6305: $result.=&arrayref2str($_).'=';
6306: } elsif (ref($_) eq 'HASH') {
6307: $result.=&hashref2str($_).'=';
6308: } elsif (ref($_)) {
6309: $result.='=';
6310: #print("Got a ref of ".(ref($_))." skipping.");
6311: } else {
6312: if ($_) {$result.=&escape($_).'=';} else { last; }
6313: }
6314:
6315: if(ref($hashref->{$_}) eq 'ARRAY') {
6316: $result.=&arrayref2str($hashref->{$_}).'&';
6317: } elsif(ref($hashref->{$_}) eq 'HASH') {
6318: $result.=&hashref2str($hashref->{$_}).'&';
6319: } elsif(ref($hashref->{$_})) {
6320: $result.='&';
6321: #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
6322: } else {
6323: $result.=&escape($hashref->{$_}).'&';
6324: }
6325: }
6326: $result=~s/\&$//;
6327: $result .= '__END_HASH_REF__';
6328: return $result;
6329: }
6330:
6331: # ----------------------------------- POD (plain old documentation, CPAN style)
6332:
6333: =head1 NAME
6334:
6335: lond - "LON Daemon" Server (port "LOND" 5663)
6336:
6337: =head1 SYNOPSIS
6338:
6339: Usage: B<lond>
6340:
6341: Should only be run as user=www. This is a command-line script which
6342: is invoked by B<loncron>. There is no expectation that a typical user
6343: will manually start B<lond> from the command-line. (In other words,
6344: DO NOT START B<lond> YOURSELF.)
6345:
6346: =head1 DESCRIPTION
6347:
6348: There are two characteristics associated with the running of B<lond>,
6349: PROCESS MANAGEMENT (starting, stopping, handling child processes)
6350: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
6351: subscriptions, etc). These are described in two large
6352: sections below.
6353:
6354: B<PROCESS MANAGEMENT>
6355:
6356: Preforker - server who forks first. Runs as a daemon. HUPs.
6357: Uses IDEA encryption
6358:
6359: B<lond> forks off children processes that correspond to the other servers
6360: in the network. Management of these processes can be done at the
6361: parent process level or the child process level.
6362:
6363: B<logs/lond.log> is the location of log messages.
6364:
6365: The process management is now explained in terms of linux shell commands,
6366: subroutines internal to this code, and signal assignments:
6367:
6368: =over 4
6369:
6370: =item *
6371:
6372: PID is stored in B<logs/lond.pid>
6373:
6374: This is the process id number of the parent B<lond> process.
6375:
6376: =item *
6377:
6378: SIGTERM and SIGINT
6379:
6380: Parent signal assignment:
6381: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
6382:
6383: Child signal assignment:
6384: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
6385: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
6386: to restart a new child.)
6387:
6388: Command-line invocations:
6389: B<kill> B<-s> SIGTERM I<PID>
6390: B<kill> B<-s> SIGINT I<PID>
6391:
6392: Subroutine B<HUNTSMAN>:
6393: This is only invoked for the B<lond> parent I<PID>.
6394: This kills all the children, and then the parent.
6395: The B<lonc.pid> file is cleared.
6396:
6397: =item *
6398:
6399: SIGHUP
6400:
6401: Current bug:
6402: This signal can only be processed the first time
6403: on the parent process. Subsequent SIGHUP signals
6404: have no effect.
6405:
6406: Parent signal assignment:
6407: $SIG{HUP} = \&HUPSMAN;
6408:
6409: Child signal assignment:
6410: none (nothing happens)
6411:
6412: Command-line invocations:
6413: B<kill> B<-s> SIGHUP I<PID>
6414:
6415: Subroutine B<HUPSMAN>:
6416: This is only invoked for the B<lond> parent I<PID>,
6417: This kills all the children, and then the parent.
6418: The B<lond.pid> file is cleared.
6419:
6420: =item *
6421:
6422: SIGUSR1
6423:
6424: Parent signal assignment:
6425: $SIG{USR1} = \&USRMAN;
6426:
6427: Child signal assignment:
6428: $SIG{USR1}= \&logstatus;
6429:
6430: Command-line invocations:
6431: B<kill> B<-s> SIGUSR1 I<PID>
6432:
6433: Subroutine B<USRMAN>:
6434: When invoked for the B<lond> parent I<PID>,
6435: SIGUSR1 is sent to all the children, and the status of
6436: each connection is logged.
6437:
6438: =item *
6439:
6440: SIGUSR2
6441:
6442: Parent Signal assignment:
6443: $SIG{USR2} = \&UpdateHosts
6444:
6445: Child signal assignment:
6446: NONE
6447:
6448:
6449: =item *
6450:
6451: SIGCHLD
6452:
6453: Parent signal assignment:
6454: $SIG{CHLD} = \&REAPER;
6455:
6456: Child signal assignment:
6457: none
6458:
6459: Command-line invocations:
6460: B<kill> B<-s> SIGCHLD I<PID>
6461:
6462: Subroutine B<REAPER>:
6463: This is only invoked for the B<lond> parent I<PID>.
6464: Information pertaining to the child is removed.
6465: The socket port is cleaned up.
6466:
6467: =back
6468:
6469: B<SERVER-SIDE ACTIVITIES>
6470:
6471: Server-side information can be accepted in an encrypted or non-encrypted
6472: method.
6473:
6474: =over 4
6475:
6476: =item ping
6477:
6478: Query a client in the hosts.tab table; "Are you there?"
6479:
6480: =item pong
6481:
6482: Respond to a ping query.
6483:
6484: =item ekey
6485:
6486: Read in encrypted key, make cipher. Respond with a buildkey.
6487:
6488: =item load
6489:
6490: Respond with CPU load based on a computation upon /proc/loadavg.
6491:
6492: =item currentauth
6493:
6494: Reply with current authentication information (only over an
6495: encrypted channel).
6496:
6497: =item auth
6498:
6499: Only over an encrypted channel, reply as to whether a user's
6500: authentication information can be validated.
6501:
6502: =item passwd
6503:
6504: Allow for a password to be set.
6505:
6506: =item makeuser
6507:
6508: Make a user.
6509:
6510: =item passwd
6511:
6512: Allow for authentication mechanism and password to be changed.
6513:
6514: =item home
6515:
6516: Respond to a question "are you the home for a given user?"
6517:
6518: =item update
6519:
6520: Update contents of a subscribed resource.
6521:
6522: =item unsubscribe
6523:
6524: The server is unsubscribing from a resource.
6525:
6526: =item subscribe
6527:
6528: The server is subscribing to a resource.
6529:
6530: =item log
6531:
6532: Place in B<logs/lond.log>
6533:
6534: =item put
6535:
6536: stores hash in namespace
6537:
6538: =item rolesputy
6539:
6540: put a role into a user's environment
6541:
6542: =item get
6543:
6544: returns hash with keys from array
6545: reference filled in from namespace
6546:
6547: =item eget
6548:
6549: returns hash with keys from array
6550: reference filled in from namesp (encrypts the return communication)
6551:
6552: =item rolesget
6553:
6554: get a role from a user's environment
6555:
6556: =item del
6557:
6558: deletes keys out of array from namespace
6559:
6560: =item keys
6561:
6562: returns namespace keys
6563:
6564: =item dump
6565:
6566: dumps the complete (or key matching regexp) namespace into a hash
6567:
6568: =item store
6569:
6570: stores hash permanently
6571: for this url; hashref needs to be given and should be a \%hashname; the
6572: remaining args aren't required and if they aren't passed or are '' they will
6573: be derived from the ENV
6574:
6575: =item restore
6576:
6577: returns a hash for a given url
6578:
6579: =item querysend
6580:
6581: Tells client about the lonsql process that has been launched in response
6582: to a sent query.
6583:
6584: =item queryreply
6585:
6586: Accept information from lonsql and make appropriate storage in temporary
6587: file space.
6588:
6589: =item idput
6590:
6591: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
6592: for each student, defined perhaps by the institutional Registrar.)
6593:
6594: =item idget
6595:
6596: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
6597: for each student, defined perhaps by the institutional Registrar.)
6598:
6599: =item tmpput
6600:
6601: Accept and store information in temporary space.
6602:
6603: =item tmpget
6604:
6605: Send along temporarily stored information.
6606:
6607: =item ls
6608:
6609: List part of a user's directory.
6610:
6611: =item pushtable
6612:
6613: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
6614: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
6615: must be restored manually in case of a problem with the new table file.
6616: pushtable requires that the request be encrypted and validated via
6617: ValidateManager. The form of the command is:
6618: enc:pushtable tablename <tablecontents> \n
6619: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
6620: cleartext newline.
6621:
6622: =item Hanging up (exit or init)
6623:
6624: What to do when a client tells the server that they (the client)
6625: are leaving the network.
6626:
6627: =item unknown command
6628:
6629: If B<lond> is sent an unknown command (not in the list above),
6630: it replys to the client "unknown_cmd".
6631:
6632:
6633: =item UNKNOWN CLIENT
6634:
6635: If the anti-spoofing algorithm cannot verify the client,
6636: the client is rejected (with a "refused" message sent
6637: to the client, and the connection is closed.
6638:
6639: =back
6640:
6641: =head1 PREREQUISITES
6642:
6643: IO::Socket
6644: IO::File
6645: Apache::File
6646: POSIX
6647: Crypt::IDEA
6648: LWP::UserAgent()
6649: GDBM_File
6650: Authen::Krb4
6651: Authen::Krb5
6652:
6653: =head1 COREQUISITES
6654:
6655: =head1 OSNAMES
6656:
6657: linux
6658:
6659: =head1 SCRIPT CATEGORIES
6660:
6661: Server/Process
6662:
6663: =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