1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.286 2005/06/24 18:00:55 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::Configuration;
35:
36: use IO::Socket;
37: use IO::File;
38: #use Apache::File;
39: use Symbol;
40: use POSIX;
41: use Crypt::IDEA;
42: use LWP::UserAgent();
43: use GDBM_File;
44: use Authen::Krb4;
45: use Authen::Krb5;
46: use lib '/home/httpd/lib/perl/';
47: use localauth;
48: use localenroll;
49: use localstudentphoto;
50: use File::Copy;
51: use LONCAPA::ConfigFileEdit;
52: use LONCAPA::lonlocal;
53: use LONCAPA::lonssl;
54: use Fcntl qw(:flock);
55:
56: my $DEBUG = 0; # Non zero to enable debug log entries.
57:
58: my $status='';
59: my $lastlog='';
60:
61: my $VERSION='$Revision: 1.286 $'; #' stupid emacs
62: my $remoteVERSION;
63: my $currenthostid="default";
64: my $currentdomainid;
65:
66: my $client;
67: my $clientip; # IP address of client.
68: my $clientname; # LonCAPA name of client.
69:
70: my $server;
71: my $thisserver; # DNS of us.
72:
73: my $keymode;
74:
75: my $cipher; # Cipher key negotiated with client
76: my $tmpsnum = 0; # Id of tmpputs.
77:
78: #
79: # Connection type is:
80: # client - All client actions are allowed
81: # manager - only management functions allowed.
82: # both - Both management and client actions are allowed
83: #
84:
85: my $ConnectionType;
86:
87: my %hostid; # ID's for hosts in cluster by ip.
88: my %hostdom; # LonCAPA domain for hosts in cluster.
89: my %hostip; # IPs for hosts in cluster.
90: my %hostdns; # ID's of hosts looked up by DNS name.
91:
92: my %managers; # Ip -> manager names
93:
94: my %perlvar; # Will have the apache conf defined perl vars.
95:
96: #
97: # The hash below is used for command dispatching, and is therefore keyed on the request keyword.
98: # Each element of the hash contains a reference to an array that contains:
99: # A reference to a sub that executes the request corresponding to the keyword.
100: # A flag that is true if the request must be encoded to be acceptable.
101: # A mask with bits as follows:
102: # CLIENT_OK - Set when the function is allowed by ordinary clients
103: # MANAGER_OK - Set when the function is allowed to manager clients.
104: #
105: my $CLIENT_OK = 1;
106: my $MANAGER_OK = 2;
107: my %Dispatcher;
108:
109:
110: #
111: # The array below are password error strings."
112: #
113: my $lastpwderror = 13; # Largest error number from lcpasswd.
114: my @passwderrors = ("ok",
115: "lcpasswd must be run as user 'www'",
116: "lcpasswd got incorrect number of arguments",
117: "lcpasswd did not get the right nubmer of input text lines",
118: "lcpasswd too many simultaneous pwd changes in progress",
119: "lcpasswd User does not exist.",
120: "lcpasswd Incorrect current passwd",
121: "lcpasswd Unable to su to root.",
122: "lcpasswd Cannot set new passwd.",
123: "lcpasswd Username has invalid characters",
124: "lcpasswd Invalid characters in password",
125: "lcpasswd User already exists",
126: "lcpasswd Something went wrong with user addition.",
127: "lcpasswd Password mismatch",
128: "lcpasswd Error filename is invalid");
129:
130:
131: # The array below are lcuseradd error strings.:
132:
133: my $lastadderror = 13;
134: my @adderrors = ("ok",
135: "User ID mismatch, lcuseradd must run as user www",
136: "lcuseradd Incorrect number of command line parameters must be 3",
137: "lcuseradd Incorrect number of stdinput lines, must be 3",
138: "lcuseradd Too many other simultaneous pwd changes in progress",
139: "lcuseradd User does not exist",
140: "lcuseradd Unable to make www member of users's group",
141: "lcuseradd Unable to su to root",
142: "lcuseradd Unable to set password",
143: "lcuseradd Usrname has invalid characters",
144: "lcuseradd Password has an invalid character",
145: "lcuseradd User already exists",
146: "lcuseradd Could not add user.",
147: "lcuseradd Password mismatch");
148:
149:
150:
151: #
152: # Statistics that are maintained and dislayed in the status line.
153: #
154: my $Transactions = 0; # Number of attempted transactions.
155: my $Failures = 0; # Number of transcations failed.
156:
157: # ResetStatistics:
158: # Resets the statistics counters:
159: #
160: sub ResetStatistics {
161: $Transactions = 0;
162: $Failures = 0;
163: }
164:
165: #------------------------------------------------------------------------
166: #
167: # LocalConnection
168: # Completes the formation of a locally authenticated connection.
169: # This function will ensure that the 'remote' client is really the
170: # local host. If not, the connection is closed, and the function fails.
171: # If so, initcmd is parsed for the name of a file containing the
172: # IDEA session key. The fie is opened, read, deleted and the session
173: # key returned to the caller.
174: #
175: # Parameters:
176: # $Socket - Socket open on client.
177: # $initcmd - The full text of the init command.
178: #
179: # Implicit inputs:
180: # $thisserver - Our DNS name.
181: #
182: # Returns:
183: # IDEA session key on success.
184: # undef on failure.
185: #
186: sub LocalConnection {
187: my ($Socket, $initcmd) = @_;
188: Debug("Attempting local connection: $initcmd client: $clientip me: $thisserver");
189: if($clientip ne "127.0.0.1") {
190: &logthis('<font color="red"> LocalConnection rejecting non local: '
191: ."$clientip ne $thisserver </font>");
192: close $Socket;
193: return undef;
194: } else {
195: chomp($initcmd); # Get rid of \n in filename.
196: my ($init, $type, $name) = split(/:/, $initcmd);
197: Debug(" Init command: $init $type $name ");
198:
199: # Require that $init = init, and $type = local: Otherwise
200: # the caller is insane:
201:
202: if(($init ne "init") && ($type ne "local")) {
203: &logthis('<font color = "red"> LocalConnection: caller is insane! '
204: ."init = $init, and type = $type </font>");
205: close($Socket);;
206: return undef;
207:
208: }
209: # Now get the key filename:
210:
211: my $IDEAKey = lonlocal::ReadKeyFile($name);
212: return $IDEAKey;
213: }
214: }
215: #------------------------------------------------------------------------------
216: #
217: # SSLConnection
218: # Completes the formation of an ssh authenticated connection. The
219: # socket is promoted to an ssl socket. If this promotion and the associated
220: # certificate exchange are successful, the IDEA key is generated and sent
221: # to the remote peer via the SSL tunnel. The IDEA key is also returned to
222: # the caller after the SSL tunnel is torn down.
223: #
224: # Parameters:
225: # Name Type Purpose
226: # $Socket IO::Socket::INET Plaintext socket.
227: #
228: # Returns:
229: # IDEA key on success.
230: # undef on failure.
231: #
232: sub SSLConnection {
233: my $Socket = shift;
234:
235: Debug("SSLConnection: ");
236: my $KeyFile = lonssl::KeyFile();
237: if(!$KeyFile) {
238: my $err = lonssl::LastError();
239: &logthis("<font color=\"red\"> CRITICAL"
240: ."Can't get key file $err </font>");
241: return undef;
242: }
243: my ($CACertificate,
244: $Certificate) = lonssl::CertificateFile();
245:
246:
247: # If any of the key, certificate or certificate authority
248: # certificate filenames are not defined, this can't work.
249:
250: if((!$Certificate) || (!$CACertificate)) {
251: my $err = lonssl::LastError();
252: &logthis("<font color=\"red\"> CRITICAL"
253: ."Can't get certificates: $err </font>");
254:
255: return undef;
256: }
257: Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
258:
259: # Indicate to our peer that we can procede with
260: # a transition to ssl authentication:
261:
262: print $Socket "ok:ssl\n";
263:
264: Debug("Approving promotion -> ssl");
265: # And do so:
266:
267: my $SSLSocket = lonssl::PromoteServerSocket($Socket,
268: $CACertificate,
269: $Certificate,
270: $KeyFile);
271: if(! ($SSLSocket) ) { # SSL socket promotion failed.
272: my $err = lonssl::LastError();
273: &logthis("<font color=\"red\"> CRITICAL "
274: ."SSL Socket promotion failed: $err </font>");
275: return undef;
276: }
277: Debug("SSL Promotion successful");
278:
279: #
280: # The only thing we'll use the socket for is to send the IDEA key
281: # to the peer:
282:
283: my $Key = lonlocal::CreateCipherKey();
284: print $SSLSocket "$Key\n";
285:
286: lonssl::Close($SSLSocket);
287:
288: Debug("Key exchange complete: $Key");
289:
290: return $Key;
291: }
292: #
293: # InsecureConnection:
294: # If insecure connections are allowd,
295: # exchange a challenge with the client to 'validate' the
296: # client (not really, but that's the protocol):
297: # We produce a challenge string that's sent to the client.
298: # The client must then echo the challenge verbatim to us.
299: #
300: # Parameter:
301: # Socket - Socket open on the client.
302: # Returns:
303: # 1 - success.
304: # 0 - failure (e.g.mismatch or insecure not allowed).
305: #
306: sub InsecureConnection {
307: my $Socket = shift;
308:
309: # Don't even start if insecure connections are not allowed.
310:
311: if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed.
312: return 0;
313: }
314:
315: # Fabricate a challenge string and send it..
316:
317: my $challenge = "$$".time; # pid + time.
318: print $Socket "$challenge\n";
319: &status("Waiting for challenge reply");
320:
321: my $answer = <$Socket>;
322: $answer =~s/\W//g;
323: if($challenge eq $answer) {
324: return 1;
325: } else {
326: logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
327: &status("No challenge reqply");
328: return 0;
329: }
330:
331:
332: }
333: #
334: # Safely execute a command (as long as it's not a shel command and doesn
335: # not require/rely on shell escapes. The function operates by doing a
336: # a pipe based fork and capturing stdout and stderr from the pipe.
337: #
338: # Formal Parameters:
339: # $line - A line of text to be executed as a command.
340: # Returns:
341: # The output from that command. If the output is multiline the caller
342: # must know how to split up the output.
343: #
344: #
345: sub execute_command {
346: my ($line) = @_;
347: my @words = split(/\s/, $line); # Bust the command up into words.
348: my $output = "";
349:
350: my $pid = open(CHILD, "-|");
351:
352: if($pid) { # Parent process
353: Debug("In parent process for execute_command");
354: my @data = <CHILD>; # Read the child's outupt...
355: close CHILD;
356: foreach my $output_line (@data) {
357: Debug("Adding $output_line");
358: $output .= $output_line; # Presumably has a \n on it.
359: }
360:
361: } else { # Child process
362: close (STDERR);
363: open (STDERR, ">&STDOUT");# Combine stderr, and stdout...
364: exec(@words); # won't return.
365: }
366: return $output;
367: }
368:
369:
370: # GetCertificate: Given a transaction that requires a certificate,
371: # this function will extract the certificate from the transaction
372: # request. Note that at this point, the only concept of a certificate
373: # is the hostname to which we are connected.
374: #
375: # Parameter:
376: # request - The request sent by our client (this parameterization may
377: # need to change when we really use a certificate granting
378: # authority.
379: #
380: sub GetCertificate {
381: my $request = shift;
382:
383: return $clientip;
384: }
385:
386: #
387: # Return true if client is a manager.
388: #
389: sub isManager {
390: return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
391: }
392: #
393: # Return tru if client can do client functions
394: #
395: sub isClient {
396: return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
397: }
398:
399:
400: #
401: # ReadManagerTable: Reads in the current manager table. For now this is
402: # done on each manager authentication because:
403: # - These authentications are not frequent
404: # - This allows dynamic changes to the manager table
405: # without the need to signal to the lond.
406: #
407: sub ReadManagerTable {
408:
409: # Clean out the old table first..
410:
411: foreach my $key (keys %managers) {
412: delete $managers{$key};
413: }
414:
415: my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
416: if (!open (MANAGERS, $tablename)) {
417: logthis('<font color="red">No manager table. Nobody can manage!!</font>');
418: return;
419: }
420: while(my $host = <MANAGERS>) {
421: chomp($host);
422: if ($host =~ "^#") { # Comment line.
423: next;
424: }
425: if (!defined $hostip{$host}) { # This is a non cluster member
426: # The entry is of the form:
427: # cluname:hostname
428: # cluname - A 'cluster hostname' is needed in order to negotiate
429: # the host key.
430: # hostname- The dns name of the host.
431: #
432: my($cluname, $dnsname) = split(/:/, $host);
433:
434: my $ip = gethostbyname($dnsname);
435: if(defined($ip)) { # bad names don't deserve entry.
436: my $hostip = inet_ntoa($ip);
437: $managers{$hostip} = $cluname;
438: logthis('<font color="green"> registering manager '.
439: "$dnsname as $cluname with $hostip </font>\n");
440: }
441: } else {
442: logthis('<font color="green"> existing host'." $host</font>\n");
443: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber
444: }
445: }
446: }
447:
448: #
449: # ValidManager: Determines if a given certificate represents a valid manager.
450: # in this primitive implementation, the 'certificate' is
451: # just the connecting loncapa client name. This is checked
452: # against a valid client list in the configuration.
453: #
454: #
455: sub ValidManager {
456: my $certificate = shift;
457:
458: return isManager;
459: }
460: #
461: # CopyFile: Called as part of the process of installing a
462: # new configuration file. This function copies an existing
463: # file to a backup file.
464: # Parameters:
465: # oldfile - Name of the file to backup.
466: # newfile - Name of the backup file.
467: # Return:
468: # 0 - Failure (errno has failure reason).
469: # 1 - Success.
470: #
471: sub CopyFile {
472:
473: my ($oldfile, $newfile) = @_;
474:
475: if (! copy($oldfile,$newfile)) {
476: return 0;
477: }
478: chmod(0660, $newfile);
479: return 1;
480: }
481: #
482: # Host files are passed out with externally visible host IPs.
483: # If, for example, we are behind a fire-wall or NAT host, our
484: # internally visible IP may be different than the externally
485: # visible IP. Therefore, we always adjust the contents of the
486: # host file so that the entry for ME is the IP that we believe
487: # we have. At present, this is defined as the entry that
488: # DNS has for us. If by some chance we are not able to get a
489: # DNS translation for us, then we assume that the host.tab file
490: # is correct.
491: # BUGBUGBUG - in the future, we really should see if we can
492: # easily query the interface(s) instead.
493: # Parameter(s):
494: # contents - The contents of the host.tab to check.
495: # Returns:
496: # newcontents - The adjusted contents.
497: #
498: #
499: sub AdjustHostContents {
500: my $contents = shift;
501: my $adjusted;
502: my $me = $perlvar{'lonHostID'};
503:
504: foreach my $line (split(/\n/,$contents)) {
505: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
506: chomp($line);
507: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
508: if ($id eq $me) {
509: my $ip = gethostbyname($name);
510: my $ipnew = inet_ntoa($ip);
511: $ip = $ipnew;
512: # Reconstruct the host line and append to adjusted:
513:
514: my $newline = "$id:$domain:$role:$name:$ip";
515: if($maxcon ne "") { # Not all hosts have loncnew tuning params
516: $newline .= ":$maxcon:$idleto:$mincon";
517: }
518: $adjusted .= $newline."\n";
519:
520: } else { # Not me, pass unmodified.
521: $adjusted .= $line."\n";
522: }
523: } else { # Blank or comment never re-written.
524: $adjusted .= $line."\n"; # Pass blanks and comments as is.
525: }
526: }
527: return $adjusted;
528: }
529: #
530: # InstallFile: Called to install an administrative file:
531: # - The file is created with <name>.tmp
532: # - The <name>.tmp file is then mv'd to <name>
533: # This lugubrious procedure is done to ensure that we are never without
534: # a valid, even if dated, version of the file regardless of who crashes
535: # and when the crash occurs.
536: #
537: # Parameters:
538: # Name of the file
539: # File Contents.
540: # Return:
541: # nonzero - success.
542: # 0 - failure and $! has an errno.
543: #
544: sub InstallFile {
545:
546: my ($Filename, $Contents) = @_;
547: my $TempFile = $Filename.".tmp";
548:
549: # Open the file for write:
550:
551: my $fh = IO::File->new("> $TempFile"); # Write to temp.
552: if(!(defined $fh)) {
553: &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
554: return 0;
555: }
556: # write the contents of the file:
557:
558: print $fh ($Contents);
559: $fh->close; # In case we ever have a filesystem w. locking
560:
561: chmod(0660, $TempFile);
562:
563: # Now we can move install the file in position.
564:
565: move($TempFile, $Filename);
566:
567: return 1;
568: }
569:
570:
571: #
572: # ConfigFileFromSelector: converts a configuration file selector
573: # (one of host or domain at this point) into a
574: # configuration file pathname.
575: #
576: # Parameters:
577: # selector - Configuration file selector.
578: # Returns:
579: # Full path to the file or undef if the selector is invalid.
580: #
581: sub ConfigFileFromSelector {
582: my $selector = shift;
583: my $tablefile;
584:
585: my $tabledir = $perlvar{'lonTabDir'}.'/';
586: if ($selector eq "hosts") {
587: $tablefile = $tabledir."hosts.tab";
588: } elsif ($selector eq "domain") {
589: $tablefile = $tabledir."domain.tab";
590: } else {
591: return undef;
592: }
593: return $tablefile;
594:
595: }
596: #
597: # PushFile: Called to do an administrative push of a file.
598: # - Ensure the file being pushed is one we support.
599: # - Backup the old file to <filename.saved>
600: # - Separate the contents of the new file out from the
601: # rest of the request.
602: # - Write the new file.
603: # Parameter:
604: # Request - The entire user request. This consists of a : separated
605: # string pushfile:tablename:contents.
606: # NOTE: The contents may have :'s in it as well making things a bit
607: # more interesting... but not much.
608: # Returns:
609: # String to send to client ("ok" or "refused" if bad file).
610: #
611: sub PushFile {
612: my $request = shift;
613: my ($command, $filename, $contents) = split(":", $request, 3);
614:
615: # At this point in time, pushes for only the following tables are
616: # supported:
617: # hosts.tab ($filename eq host).
618: # domain.tab ($filename eq domain).
619: # Construct the destination filename or reject the request.
620: #
621: # lonManage is supposed to ensure this, however this session could be
622: # part of some elaborate spoof that managed somehow to authenticate.
623: #
624:
625:
626: my $tablefile = ConfigFileFromSelector($filename);
627: if(! (defined $tablefile)) {
628: return "refused";
629: }
630: #
631: # >copy< the old table to the backup table
632: # don't rename in case system crashes/reboots etc. in the time
633: # window between a rename and write.
634: #
635: my $backupfile = $tablefile;
636: $backupfile =~ s/\.tab$/.old/;
637: if(!CopyFile($tablefile, $backupfile)) {
638: &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
639: return "error:$!";
640: }
641: &logthis('<font color="green"> Pushfile: backed up '
642: .$tablefile." to $backupfile</font>");
643:
644: # If the file being pushed is the host file, we adjust the entry for ourself so that the
645: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible
646: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a
647: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
648: # that possibilty.
649:
650: if($filename eq "host") {
651: $contents = AdjustHostContents($contents);
652: }
653:
654: # Install the new file:
655:
656: if(!InstallFile($tablefile, $contents)) {
657: &logthis('<font color="red"> Pushfile: unable to install '
658: .$tablefile." $! </font>");
659: return "error:$!";
660: } else {
661: &logthis('<font color="green"> Installed new '.$tablefile
662: ."</font>");
663:
664: }
665:
666:
667: # Indicate success:
668:
669: return "ok";
670:
671: }
672:
673: #
674: # Called to re-init either lonc or lond.
675: #
676: # Parameters:
677: # request - The full request by the client. This is of the form
678: # reinit:<process>
679: # where <process> is allowed to be either of
680: # lonc or lond
681: #
682: # Returns:
683: # The string to be sent back to the client either:
684: # ok - Everything worked just fine.
685: # error:why - There was a failure and why describes the reason.
686: #
687: #
688: sub ReinitProcess {
689: my $request = shift;
690:
691:
692: # separate the request (reinit) from the process identifier and
693: # validate it producing the name of the .pid file for the process.
694: #
695: #
696: my ($junk, $process) = split(":", $request);
697: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
698: if($process eq 'lonc') {
699: $processpidfile = $processpidfile."lonc.pid";
700: if (!open(PIDFILE, "< $processpidfile")) {
701: return "error:Open failed for $processpidfile";
702: }
703: my $loncpid = <PIDFILE>;
704: close(PIDFILE);
705: logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
706: ."</font>");
707: kill("USR2", $loncpid);
708: } elsif ($process eq 'lond') {
709: logthis('<font color="red"> Reinitializing self (lond) </font>');
710: &UpdateHosts; # Lond is us!!
711: } else {
712: &logthis('<font color="yellow" Invalid reinit request for '.$process
713: ."</font>");
714: return "error:Invalid process identifier $process";
715: }
716: return 'ok';
717: }
718: # Validate a line in a configuration file edit script:
719: # Validation includes:
720: # - Ensuring the command is valid.
721: # - Ensuring the command has sufficient parameters
722: # Parameters:
723: # scriptline - A line to validate (\n has been stripped for what it's worth).
724: #
725: # Return:
726: # 0 - Invalid scriptline.
727: # 1 - Valid scriptline
728: # NOTE:
729: # Only the command syntax is checked, not the executability of the
730: # command.
731: #
732: sub isValidEditCommand {
733: my $scriptline = shift;
734:
735: # Line elements are pipe separated:
736:
737: my ($command, $key, $newline) = split(/\|/, $scriptline);
738: &logthis('<font color="green"> isValideditCommand checking: '.
739: "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
740:
741: if ($command eq "delete") {
742: #
743: # key with no newline.
744: #
745: if( ($key eq "") || ($newline ne "")) {
746: return 0; # Must have key but no newline.
747: } else {
748: return 1; # Valid syntax.
749: }
750: } elsif ($command eq "replace") {
751: #
752: # key and newline:
753: #
754: if (($key eq "") || ($newline eq "")) {
755: return 0;
756: } else {
757: return 1;
758: }
759: } elsif ($command eq "append") {
760: if (($key ne "") && ($newline eq "")) {
761: return 1;
762: } else {
763: return 0;
764: }
765: } else {
766: return 0; # Invalid command.
767: }
768: return 0; # Should not get here!!!
769: }
770: #
771: # ApplyEdit - Applies an edit command to a line in a configuration
772: # file. It is the caller's responsiblity to validate the
773: # edit line.
774: # Parameters:
775: # $directive - A single edit directive to apply.
776: # Edit directives are of the form:
777: # append|newline - Appends a new line to the file.
778: # replace|key|newline - Replaces the line with key value 'key'
779: # delete|key - Deletes the line with key value 'key'.
780: # $editor - A config file editor object that contains the
781: # file being edited.
782: #
783: sub ApplyEdit {
784:
785: my ($directive, $editor) = @_;
786:
787: # Break the directive down into its command and its parameters
788: # (at most two at this point. The meaning of the parameters, if in fact
789: # they exist depends on the command).
790:
791: my ($command, $p1, $p2) = split(/\|/, $directive);
792:
793: if($command eq "append") {
794: $editor->Append($p1); # p1 - key p2 null.
795: } elsif ($command eq "replace") {
796: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline.
797: } elsif ($command eq "delete") {
798: $editor->DeleteLine($p1); # p1 - key p2 null.
799: } else { # Should not get here!!!
800: die "Invalid command given to ApplyEdit $command"
801: }
802: }
803: #
804: # AdjustOurHost:
805: # Adjusts a host file stored in a configuration file editor object
806: # for the true IP address of this host. This is necessary for hosts
807: # that live behind a firewall.
808: # Those hosts have a publicly distributed IP of the firewall, but
809: # internally must use their actual IP. We assume that a given
810: # host only has a single IP interface for now.
811: # Formal Parameters:
812: # editor - The configuration file editor to adjust. This
813: # editor is assumed to contain a hosts.tab file.
814: # Strategy:
815: # - Figure out our hostname.
816: # - Lookup the entry for this host.
817: # - Modify the line to contain our IP
818: # - Do a replace for this host.
819: sub AdjustOurHost {
820: my $editor = shift;
821:
822: # figure out who I am.
823:
824: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname.
825:
826: # Get my host file entry.
827:
828: my $ConfigLine = $editor->Find($myHostName);
829: if(! (defined $ConfigLine)) {
830: die "AdjustOurHost - no entry for me in hosts file $myHostName";
831: }
832: # figure out my IP:
833: # Use the config line to get my hostname.
834: # Use gethostbyname to translate that into an IP address.
835: #
836: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
837: my $BinaryIp = gethostbyname($name);
838: my $ip = inet_ntoa($ip);
839: #
840: # Reassemble the config line from the elements in the list.
841: # Note that if the loncnew items were not present before, they will
842: # be now even if they would be empty
843: #
844: my $newConfigLine = $id;
845: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
846: $newConfigLine .= ":".$item;
847: }
848: # Replace the line:
849:
850: $editor->ReplaceLine($id, $newConfigLine);
851:
852: }
853: #
854: # ReplaceConfigFile:
855: # Replaces a configuration file with the contents of a
856: # configuration file editor object.
857: # This is done by:
858: # - Copying the target file to <filename>.old
859: # - Writing the new file to <filename>.tmp
860: # - Moving <filename.tmp> -> <filename>
861: # This laborious process ensures that the system is never without
862: # a configuration file that's at least valid (even if the contents
863: # may be dated).
864: # Parameters:
865: # filename - Name of the file to modify... this is a full path.
866: # editor - Editor containing the file.
867: #
868: sub ReplaceConfigFile {
869:
870: my ($filename, $editor) = @_;
871:
872: CopyFile ($filename, $filename.".old");
873:
874: my $contents = $editor->Get(); # Get the contents of the file.
875:
876: InstallFile($filename, $contents);
877: }
878: #
879: #
880: # Called to edit a configuration table file
881: # Parameters:
882: # request - The entire command/request sent by lonc or lonManage
883: # Return:
884: # The reply to send to the client.
885: #
886: sub EditFile {
887: my $request = shift;
888:
889: # Split the command into it's pieces: edit:filetype:script
890:
891: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script
892:
893: # Check the pre-coditions for success:
894:
895: if($request != "edit") { # Something is amiss afoot alack.
896: return "error:edit request detected, but request != 'edit'\n";
897: }
898: if( ($filetype ne "hosts") &&
899: ($filetype ne "domain")) {
900: return "error:edit requested with invalid file specifier: $filetype \n";
901: }
902:
903: # Split the edit script and check it's validity.
904:
905: my @scriptlines = split(/\n/, $script); # one line per element.
906: my $linecount = scalar(@scriptlines);
907: for(my $i = 0; $i < $linecount; $i++) {
908: chomp($scriptlines[$i]);
909: if(!isValidEditCommand($scriptlines[$i])) {
910: return "error:edit with bad script line: '$scriptlines[$i]' \n";
911: }
912: }
913:
914: # Execute the edit operation.
915: # - Create a config file editor for the appropriate file and
916: # - execute each command in the script:
917: #
918: my $configfile = ConfigFileFromSelector($filetype);
919: if (!(defined $configfile)) {
920: return "refused\n";
921: }
922: my $editor = ConfigFileEdit->new($configfile);
923:
924: for (my $i = 0; $i < $linecount; $i++) {
925: ApplyEdit($scriptlines[$i], $editor);
926: }
927: # If the file is the host file, ensure that our host is
928: # adjusted to have our ip:
929: #
930: if($filetype eq "host") {
931: AdjustOurHost($editor);
932: }
933: # Finally replace the current file with our file.
934: #
935: ReplaceConfigFile($configfile, $editor);
936:
937: return "ok\n";
938: }
939:
940: #---------------------------------------------------------------
941: #
942: # Manipulation of hash based databases (factoring out common code
943: # for later use as we refactor.
944: #
945: # Ties a domain level resource file to a hash.
946: # If requested a history entry is created in the associated hist file.
947: #
948: # Parameters:
949: # domain - Name of the domain in which the resource file lives.
950: # namespace - Name of the hash within that domain.
951: # how - How to tie the hash (e.g. GDBM_WRCREAT()).
952: # loghead - Optional parameter, if present a log entry is created
953: # in the associated history file and this is the first part
954: # of that entry.
955: # logtail - Goes along with loghead, The actual logentry is of the
956: # form $loghead:<timestamp>:logtail.
957: # Returns:
958: # Reference to a hash bound to the db file or alternatively undef
959: # if the tie failed.
960: #
961: sub tie_domain_hash {
962: my ($domain,$namespace,$how,$loghead,$logtail) = @_;
963:
964: # Filter out any whitespace in the domain name:
965:
966: $domain =~ s/\W//g;
967:
968: # We have enough to go on to tie the hash:
969:
970: my $user_top_dir = $perlvar{'lonUsersDir'};
971: my $domain_dir = $user_top_dir."/$domain";
972: my $resource_file = $domain_dir."/$namespace.db";
973: my %hash;
974: if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) {
975: if (defined($loghead)) { # Need to log the operation.
976: my $logFh = IO::File->new(">>$domain_dir/$namespace.hist");
977: if($logFh) {
978: my $timestamp = time;
979: print $logFh "$loghead:$timestamp:$logtail\n";
980: }
981: $logFh->close;
982: }
983: return \%hash; # Return the tied hash.
984: } else {
985: return undef; # Tie failed.
986: }
987: }
988:
989: #
990: # Ties a user's resource file to a hash.
991: # If necessary, an appropriate history
992: # log file entry is made as well.
993: # This sub factors out common code from the subs that manipulate
994: # the various gdbm files that keep keyword value pairs.
995: # Parameters:
996: # domain - Name of the domain the user is in.
997: # user - Name of the 'current user'.
998: # namespace - Namespace representing the file to tie.
999: # how - What the tie is done to (e.g. GDBM_WRCREAT().
1000: # loghead - Optional first part of log entry if there may be a
1001: # history file.
1002: # what - Optional tail of log entry if there may be a history
1003: # file.
1004: # Returns:
1005: # hash to which the database is tied. It's up to the caller to untie.
1006: # undef if the has could not be tied.
1007: #
1008: sub tie_user_hash {
1009: my ($domain,$user,$namespace,$how,$loghead,$what) = @_;
1010:
1011: $namespace=~s/\//\_/g; # / -> _
1012: $namespace=~s/\W//g; # whitespace eliminated.
1013: my $proname = propath($domain, $user);
1014:
1015: # Tie the database.
1016:
1017: my %hash;
1018: if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",
1019: $how, 0640)) {
1020: # If this is a namespace for which a history is kept,
1021: # make the history log entry:
1022: if (($namespace !~/^nohist\_/) && (defined($loghead))) {
1023: my $args = scalar @_;
1024: Debug(" Opening history: $namespace $args");
1025: my $hfh = IO::File->new(">>$proname/$namespace.hist");
1026: if($hfh) {
1027: my $now = time;
1028: print $hfh "$loghead:$now:$what\n";
1029: }
1030: $hfh->close;
1031: }
1032: return \%hash;
1033: } else {
1034: return undef;
1035: }
1036:
1037: }
1038:
1039: # read_profile
1040: #
1041: # Returns a set of specific entries from a user's profile file.
1042: # this is a utility function that is used by both get_profile_entry and
1043: # get_profile_entry_encrypted.
1044: #
1045: # Parameters:
1046: # udom - Domain in which the user exists.
1047: # uname - User's account name (loncapa account)
1048: # namespace - The profile namespace to open.
1049: # what - A set of & separated queries.
1050: # Returns:
1051: # If all ok: - The string that needs to be shipped back to the user.
1052: # If failure - A string that starts with error: followed by the failure
1053: # reason.. note that this probabyl gets shipped back to the
1054: # user as well.
1055: #
1056: sub read_profile {
1057: my ($udom, $uname, $namespace, $what) = @_;
1058:
1059: my $hashref = &tie_user_hash($udom, $uname, $namespace,
1060: &GDBM_READER());
1061: if ($hashref) {
1062: my @queries=split(/\&/,$what);
1063: my $qresult='';
1064:
1065: for (my $i=0;$i<=$#queries;$i++) {
1066: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string.
1067: }
1068: $qresult=~s/\&$//; # Remove trailing & from last lookup.
1069: if (untie %$hashref) {
1070: return $qresult;
1071: } else {
1072: return "error: ".($!+0)." untie (GDBM) Failed";
1073: }
1074: } else {
1075: if ($!+0 == 2) {
1076: return "error:No such file or GDBM reported bad block error";
1077: } else {
1078: return "error: ".($!+0)." tie (GDBM) Failed";
1079: }
1080: }
1081:
1082: }
1083: #--------------------- Request Handlers --------------------------------------------
1084: #
1085: # By convention each request handler registers itself prior to the sub
1086: # declaration:
1087: #
1088:
1089: #++
1090: #
1091: # Handles ping requests.
1092: # Parameters:
1093: # $cmd - the actual keyword that invoked us.
1094: # $tail - the tail of the request that invoked us.
1095: # $replyfd- File descriptor connected to the client
1096: # Implicit Inputs:
1097: # $currenthostid - Global variable that carries the name of the host we are
1098: # known as.
1099: # Returns:
1100: # 1 - Ok to continue processing.
1101: # 0 - Program should exit.
1102: # Side effects:
1103: # Reply information is sent to the client.
1104: sub ping_handler {
1105: my ($cmd, $tail, $client) = @_;
1106: Debug("$cmd $tail $client .. $currenthostid:");
1107:
1108: Reply( $client,"$currenthostid\n","$cmd:$tail");
1109:
1110: return 1;
1111: }
1112: ®ister_handler("ping", \&ping_handler, 0, 1, 1); # Ping unencoded, client or manager.
1113:
1114: #++
1115: #
1116: # Handles pong requests. Pong replies with our current host id, and
1117: # the results of a ping sent to us via our lonc.
1118: #
1119: # Parameters:
1120: # $cmd - the actual keyword that invoked us.
1121: # $tail - the tail of the request that invoked us.
1122: # $replyfd- File descriptor connected to the client
1123: # Implicit Inputs:
1124: # $currenthostid - Global variable that carries the name of the host we are
1125: # connected to.
1126: # Returns:
1127: # 1 - Ok to continue processing.
1128: # 0 - Program should exit.
1129: # Side effects:
1130: # Reply information is sent to the client.
1131: sub pong_handler {
1132: my ($cmd, $tail, $replyfd) = @_;
1133:
1134: my $reply=&reply("ping",$clientname);
1135: &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
1136: return 1;
1137: }
1138: ®ister_handler("pong", \&pong_handler, 0, 1, 1); # Pong unencoded, client or manager
1139:
1140: #++
1141: # Called to establish an encrypted session key with the remote client.
1142: # Note that with secure lond, in most cases this function is never
1143: # invoked. Instead, the secure session key is established either
1144: # via a local file that's locked down tight and only lives for a short
1145: # time, or via an ssl tunnel...and is generated from a bunch-o-random
1146: # bits from /dev/urandom, rather than the predictable pattern used by
1147: # by this sub. This sub is only used in the old-style insecure
1148: # key negotiation.
1149: # Parameters:
1150: # $cmd - the actual keyword that invoked us.
1151: # $tail - the tail of the request that invoked us.
1152: # $replyfd- File descriptor connected to the client
1153: # Implicit Inputs:
1154: # $currenthostid - Global variable that carries the name of the host
1155: # known as.
1156: # $clientname - Global variable that carries the name of the hsot we're connected to.
1157: # Returns:
1158: # 1 - Ok to continue processing.
1159: # 0 - Program should exit.
1160: # Implicit Outputs:
1161: # Reply information is sent to the client.
1162: # $cipher is set with a reference to a new IDEA encryption object.
1163: #
1164: sub establish_key_handler {
1165: my ($cmd, $tail, $replyfd) = @_;
1166:
1167: my $buildkey=time.$$.int(rand 100000);
1168: $buildkey=~tr/1-6/A-F/;
1169: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
1170: my $key=$currenthostid.$clientname;
1171: $key=~tr/a-z/A-Z/;
1172: $key=~tr/G-P/0-9/;
1173: $key=~tr/Q-Z/0-9/;
1174: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
1175: $key=substr($key,0,32);
1176: my $cipherkey=pack("H32",$key);
1177: $cipher=new IDEA $cipherkey;
1178: &Reply($replyfd, "$buildkey\n", "$cmd:$tail");
1179:
1180: return 1;
1181:
1182: }
1183: ®ister_handler("ekey", \&establish_key_handler, 0, 1,1);
1184:
1185: # Handler for the load command. Returns the current system load average
1186: # to the requestor.
1187: #
1188: # Parameters:
1189: # $cmd - the actual keyword that invoked us.
1190: # $tail - the tail of the request that invoked us.
1191: # $replyfd- File descriptor connected to the client
1192: # Implicit Inputs:
1193: # $currenthostid - Global variable that carries the name of the host
1194: # known as.
1195: # $clientname - Global variable that carries the name of the hsot we're connected to.
1196: # Returns:
1197: # 1 - Ok to continue processing.
1198: # 0 - Program should exit.
1199: # Side effects:
1200: # Reply information is sent to the client.
1201: sub load_handler {
1202: my ($cmd, $tail, $replyfd) = @_;
1203:
1204: # Get the load average from /proc/loadavg and calculate it as a percentage of
1205: # the allowed load limit as set by the perl global variable lonLoadLim
1206:
1207: my $loadavg;
1208: my $loadfile=IO::File->new('/proc/loadavg');
1209:
1210: $loadavg=<$loadfile>;
1211: $loadavg =~ s/\s.*//g; # Extract the first field only.
1212:
1213: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
1214:
1215: &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
1216:
1217: return 1;
1218: }
1219: ®ister_handler("load", \&load_handler, 0, 1, 0);
1220:
1221: #
1222: # Process the userload request. This sub returns to the client the current
1223: # user load average. It can be invoked either by clients or managers.
1224: #
1225: # Parameters:
1226: # $cmd - the actual keyword that invoked us.
1227: # $tail - the tail of the request that invoked us.
1228: # $replyfd- File descriptor connected to the client
1229: # Implicit Inputs:
1230: # $currenthostid - Global variable that carries the name of the host
1231: # known as.
1232: # $clientname - Global variable that carries the name of the hsot we're connected to.
1233: # Returns:
1234: # 1 - Ok to continue processing.
1235: # 0 - Program should exit
1236: # Implicit inputs:
1237: # whatever the userload() function requires.
1238: # Implicit outputs:
1239: # the reply is written to the client.
1240: #
1241: sub user_load_handler {
1242: my ($cmd, $tail, $replyfd) = @_;
1243:
1244: my $userloadpercent=&userload();
1245: &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
1246:
1247: return 1;
1248: }
1249: ®ister_handler("userload", \&user_load_handler, 0, 1, 0);
1250:
1251: # Process a request for the authorization type of a user:
1252: # (userauth).
1253: #
1254: # Parameters:
1255: # $cmd - the actual keyword that invoked us.
1256: # $tail - the tail of the request that invoked us.
1257: # $replyfd- File descriptor connected to the client
1258: # Returns:
1259: # 1 - Ok to continue processing.
1260: # 0 - Program should exit
1261: # Implicit outputs:
1262: # The user authorization type is written to the client.
1263: #
1264: sub user_authorization_type {
1265: my ($cmd, $tail, $replyfd) = @_;
1266:
1267: my $userinput = "$cmd:$tail";
1268:
1269: # Pull the domain and username out of the command tail.
1270: # and call get_auth_type to determine the authentication type.
1271:
1272: my ($udom,$uname)=split(/:/,$tail);
1273: my $result = &get_auth_type($udom, $uname);
1274: if($result eq "nouser") {
1275: &Failure( $replyfd, "unknown_user\n", $userinput);
1276: } else {
1277: #
1278: # We only want to pass the second field from get_auth_type
1279: # for ^krb.. otherwise we'll be handing out the encrypted
1280: # password for internals e.g.
1281: #
1282: my ($type,$otherinfo) = split(/:/,$result);
1283: if($type =~ /^krb/) {
1284: $type = $result;
1285: } else {
1286: $type .= ':';
1287: }
1288: &Reply( $replyfd, "$type\n", $userinput);
1289: }
1290:
1291: return 1;
1292: }
1293: ®ister_handler("currentauth", \&user_authorization_type, 1, 1, 0);
1294:
1295: # Process a request by a manager to push a hosts or domain table
1296: # to us. We pick apart the command and pass it on to the subs
1297: # that already exist to do this.
1298: #
1299: # Parameters:
1300: # $cmd - the actual keyword that invoked us.
1301: # $tail - the tail of the request that invoked us.
1302: # $client - File descriptor connected to the client
1303: # Returns:
1304: # 1 - Ok to continue processing.
1305: # 0 - Program should exit
1306: # Implicit Output:
1307: # a reply is written to the client.
1308: sub push_file_handler {
1309: my ($cmd, $tail, $client) = @_;
1310:
1311: my $userinput = "$cmd:$tail";
1312:
1313: # At this time we only know that the IP of our partner is a valid manager
1314: # the code below is a hook to do further authentication (e.g. to resolve
1315: # spoofing).
1316:
1317: my $cert = &GetCertificate($userinput);
1318: if(&ValidManager($cert)) {
1319:
1320: # Now presumably we have the bona fides of both the peer host and the
1321: # process making the request.
1322:
1323: my $reply = &PushFile($userinput);
1324: &Reply($client, "$reply\n", $userinput);
1325:
1326: } else {
1327: &Failure( $client, "refused\n", $userinput);
1328: }
1329: return 1;
1330: }
1331: ®ister_handler("pushfile", \&push_file_handler, 1, 0, 1);
1332:
1333: #
1334: # du - list the disk usuage of a directory recursively.
1335: #
1336: # note: stolen code from the ls file handler
1337: # under construction by Rick Banghart
1338: # .
1339: # Parameters:
1340: # $cmd - The command that dispatched us (du).
1341: # $ududir - The directory path to list... I'm not sure what this
1342: # is relative as things like ls:. return e.g.
1343: # no_such_dir.
1344: # $client - Socket open on the client.
1345: # Returns:
1346: # 1 - indicating that the daemon should not disconnect.
1347: # Side Effects:
1348: # The reply is written to $client.
1349: #
1350: sub du_handler {
1351: my ($cmd, $ududir, $client) = @_;
1352: my ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
1353: my $userinput = "$cmd:$ududir";
1354:
1355: if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
1356: &Failure($client,"refused\n","$cmd:$ududir");
1357: return 1;
1358: }
1359: # Since $ududir could have some nasties in it,
1360: # we will require that ududir is a valid
1361: # directory. Just in case someone tries to
1362: # slip us a line like .;(cd /home/httpd rm -rf*)
1363: # etc.
1364: #
1365: if (-d $ududir) {
1366: # And as Shakespeare would say to make
1367: # assurance double sure,
1368: # use execute_command to ensure that the command is not executed in
1369: # a shell that can screw us up.
1370:
1371: my $duout = execute_command("du -ks $ududir");
1372: $duout=~s/[^\d]//g; #preserve only the numbers
1373: &Reply($client,"$duout\n","$cmd:$ududir");
1374: } else {
1375:
1376: &Failure($client, "bad_directory:$ududir\n","$cmd:$ududir");
1377:
1378: }
1379: return 1;
1380: }
1381: ®ister_handler("du", \&du_handler, 0, 1, 0);
1382:
1383: #
1384: # The ls_handler routine should be considered obosolete and is retained
1385: # for communication with legacy servers. Please see the ls2_handler.
1386: #
1387: # ls - list the contents of a directory. For each file in the
1388: # selected directory the filename followed by the full output of
1389: # the stat function is returned. The returned info for each
1390: # file are separated by ':'. The stat fields are separated by &'s.
1391: # Parameters:
1392: # $cmd - The command that dispatched us (ls).
1393: # $ulsdir - The directory path to list... I'm not sure what this
1394: # is relative as things like ls:. return e.g.
1395: # no_such_dir.
1396: # $client - Socket open on the client.
1397: # Returns:
1398: # 1 - indicating that the daemon should not disconnect.
1399: # Side Effects:
1400: # The reply is written to $client.
1401: #
1402: sub ls_handler {
1403: # obsoleted by ls2_handler
1404: my ($cmd, $ulsdir, $client) = @_;
1405:
1406: my $userinput = "$cmd:$ulsdir";
1407:
1408: my $obs;
1409: my $rights;
1410: my $ulsout='';
1411: my $ulsfn;
1412: if (-e $ulsdir) {
1413: if(-d $ulsdir) {
1414: if (opendir(LSDIR,$ulsdir)) {
1415: while ($ulsfn=readdir(LSDIR)) {
1416: undef $obs, $rights;
1417: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1418: #We do some obsolete checking here
1419: if(-e $ulsdir.'/'.$ulsfn.".meta") {
1420: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
1421: my @obsolete=<FILE>;
1422: foreach my $obsolete (@obsolete) {
1423: if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
1424: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
1425: }
1426: }
1427: $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
1428: if($obs eq '1') { $ulsout.="&1"; }
1429: else { $ulsout.="&0"; }
1430: if($rights eq '1') { $ulsout.="&1:"; }
1431: else { $ulsout.="&0:"; }
1432: }
1433: closedir(LSDIR);
1434: }
1435: } else {
1436: my @ulsstats=stat($ulsdir);
1437: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1438: }
1439: } else {
1440: $ulsout='no_such_dir';
1441: }
1442: if ($ulsout eq '') { $ulsout='empty'; }
1443: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1444:
1445: return 1;
1446:
1447: }
1448: ®ister_handler("ls", \&ls_handler, 0, 1, 0);
1449:
1450: #
1451: # Please also see the ls_handler, which this routine obosolets.
1452: # ls2_handler differs from ls_handler in that it escapes its return
1453: # values before concatenating them together with ':'s.
1454: #
1455: # ls2 - list the contents of a directory. For each file in the
1456: # selected directory the filename followed by the full output of
1457: # the stat function is returned. The returned info for each
1458: # file are separated by ':'. The stat fields are separated by &'s.
1459: # Parameters:
1460: # $cmd - The command that dispatched us (ls).
1461: # $ulsdir - The directory path to list... I'm not sure what this
1462: # is relative as things like ls:. return e.g.
1463: # no_such_dir.
1464: # $client - Socket open on the client.
1465: # Returns:
1466: # 1 - indicating that the daemon should not disconnect.
1467: # Side Effects:
1468: # The reply is written to $client.
1469: #
1470: sub ls2_handler {
1471: my ($cmd, $ulsdir, $client) = @_;
1472:
1473: my $userinput = "$cmd:$ulsdir";
1474:
1475: my $obs;
1476: my $rights;
1477: my $ulsout='';
1478: my $ulsfn;
1479: if (-e $ulsdir) {
1480: if(-d $ulsdir) {
1481: if (opendir(LSDIR,$ulsdir)) {
1482: while ($ulsfn=readdir(LSDIR)) {
1483: undef $obs, $rights;
1484: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1485: #We do some obsolete checking here
1486: if(-e $ulsdir.'/'.$ulsfn.".meta") {
1487: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
1488: my @obsolete=<FILE>;
1489: foreach my $obsolete (@obsolete) {
1490: if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
1491: if($obsolete =~ m|(<copyright>)(default)|) {
1492: $rights = 1;
1493: }
1494: }
1495: }
1496: my $tmp = $ulsfn.'&'.join('&',@ulsstats);
1497: if ($obs eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
1498: if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
1499: $ulsout.= &escape($tmp).':';
1500: }
1501: closedir(LSDIR);
1502: }
1503: } else {
1504: my @ulsstats=stat($ulsdir);
1505: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1506: }
1507: } else {
1508: $ulsout='no_such_dir';
1509: }
1510: if ($ulsout eq '') { $ulsout='empty'; }
1511: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1512: return 1;
1513: }
1514: ®ister_handler("ls2", \&ls2_handler, 0, 1, 0);
1515:
1516: # Process a reinit request. Reinit requests that either
1517: # lonc or lond be reinitialized so that an updated
1518: # host.tab or domain.tab can be processed.
1519: #
1520: # Parameters:
1521: # $cmd - the actual keyword that invoked us.
1522: # $tail - the tail of the request that invoked us.
1523: # $client - File descriptor connected to the client
1524: # Returns:
1525: # 1 - Ok to continue processing.
1526: # 0 - Program should exit
1527: # Implicit output:
1528: # a reply is sent to the client.
1529: #
1530: sub reinit_process_handler {
1531: my ($cmd, $tail, $client) = @_;
1532:
1533: my $userinput = "$cmd:$tail";
1534:
1535: my $cert = &GetCertificate($userinput);
1536: if(&ValidManager($cert)) {
1537: chomp($userinput);
1538: my $reply = &ReinitProcess($userinput);
1539: &Reply( $client, "$reply\n", $userinput);
1540: } else {
1541: &Failure( $client, "refused\n", $userinput);
1542: }
1543: return 1;
1544: }
1545: ®ister_handler("reinit", \&reinit_process_handler, 1, 0, 1);
1546:
1547: # Process the editing script for a table edit operation.
1548: # the editing operation must be encrypted and requested by
1549: # a manager host.
1550: #
1551: # Parameters:
1552: # $cmd - the actual keyword that invoked us.
1553: # $tail - the tail of the request that invoked us.
1554: # $client - File descriptor connected to the client
1555: # Returns:
1556: # 1 - Ok to continue processing.
1557: # 0 - Program should exit
1558: # Implicit output:
1559: # a reply is sent to the client.
1560: #
1561: sub edit_table_handler {
1562: my ($command, $tail, $client) = @_;
1563:
1564: my $userinput = "$command:$tail";
1565:
1566: my $cert = &GetCertificate($userinput);
1567: if(&ValidManager($cert)) {
1568: my($filetype, $script) = split(/:/, $tail);
1569: if (($filetype eq "hosts") ||
1570: ($filetype eq "domain")) {
1571: if($script ne "") {
1572: &Reply($client, # BUGBUG - EditFile
1573: &EditFile($userinput), # could fail.
1574: $userinput);
1575: } else {
1576: &Failure($client,"refused\n",$userinput);
1577: }
1578: } else {
1579: &Failure($client,"refused\n",$userinput);
1580: }
1581: } else {
1582: &Failure($client,"refused\n",$userinput);
1583: }
1584: return 1;
1585: }
1586: ®ister_handler("edit", \&edit_table_handler, 1, 0, 1);
1587:
1588: #
1589: # Authenticate a user against the LonCAPA authentication
1590: # database. Note that there are several authentication
1591: # possibilities:
1592: # - unix - The user can be authenticated against the unix
1593: # password file.
1594: # - internal - The user can be authenticated against a purely
1595: # internal per user password file.
1596: # - kerberos - The user can be authenticated against either a kerb4 or kerb5
1597: # ticket granting authority.
1598: # - user - The person tailoring LonCAPA can supply a user authentication
1599: # mechanism that is per system.
1600: #
1601: # Parameters:
1602: # $cmd - The command that got us here.
1603: # $tail - Tail of the command (remaining parameters).
1604: # $client - File descriptor connected to client.
1605: # Returns
1606: # 0 - Requested to exit, caller should shut down.
1607: # 1 - Continue processing.
1608: # Implicit inputs:
1609: # The authentication systems describe above have their own forms of implicit
1610: # input into the authentication process that are described above.
1611: #
1612: sub authenticate_handler {
1613: my ($cmd, $tail, $client) = @_;
1614:
1615:
1616: # Regenerate the full input line
1617:
1618: my $userinput = $cmd.":".$tail;
1619:
1620: # udom - User's domain.
1621: # uname - Username.
1622: # upass - User's password.
1623:
1624: my ($udom,$uname,$upass)=split(/:/,$tail);
1625: &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
1626: chomp($upass);
1627: $upass=&unescape($upass);
1628:
1629: my $pwdcorrect = &validate_user($udom, $uname, $upass);
1630: if($pwdcorrect) {
1631: &Reply( $client, "authorized\n", $userinput);
1632: #
1633: # Bad credentials: Failed to authorize
1634: #
1635: } else {
1636: &Failure( $client, "non_authorized\n", $userinput);
1637: }
1638:
1639: return 1;
1640: }
1641: ®ister_handler("auth", \&authenticate_handler, 1, 1, 0);
1642:
1643: #
1644: # Change a user's password. Note that this function is complicated by
1645: # the fact that a user may be authenticated in more than one way:
1646: # At present, we are not able to change the password for all types of
1647: # authentication methods. Only for:
1648: # unix - unix password or shadow passoword style authentication.
1649: # local - Locally written authentication mechanism.
1650: # For now, kerb4 and kerb5 password changes are not supported and result
1651: # in an error.
1652: # FUTURE WORK:
1653: # Support kerberos passwd changes?
1654: # Parameters:
1655: # $cmd - The command that got us here.
1656: # $tail - Tail of the command (remaining parameters).
1657: # $client - File descriptor connected to client.
1658: # Returns
1659: # 0 - Requested to exit, caller should shut down.
1660: # 1 - Continue processing.
1661: # Implicit inputs:
1662: # The authentication systems describe above have their own forms of implicit
1663: # input into the authentication process that are described above.
1664: sub change_password_handler {
1665: my ($cmd, $tail, $client) = @_;
1666:
1667: my $userinput = $cmd.":".$tail; # Reconstruct client's string.
1668:
1669: #
1670: # udom - user's domain.
1671: # uname - Username.
1672: # upass - Current password.
1673: # npass - New password.
1674:
1675: my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
1676:
1677: $upass=&unescape($upass);
1678: $npass=&unescape($npass);
1679: &Debug("Trying to change password for $uname");
1680:
1681: # First require that the user can be authenticated with their
1682: # old password:
1683:
1684: my $validated = &validate_user($udom, $uname, $upass);
1685: if($validated) {
1686: my $realpasswd = &get_auth_type($udom, $uname); # Defined since authd.
1687:
1688: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
1689: if ($howpwd eq 'internal') {
1690: &Debug("internal auth");
1691: my $salt=time;
1692: $salt=substr($salt,6,2);
1693: my $ncpass=crypt($npass,$salt);
1694: if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
1695: &logthis("Result of password change for "
1696: ."$uname: pwchange_success");
1697: &Reply($client, "ok\n", $userinput);
1698: } else {
1699: &logthis("Unable to open $uname passwd "
1700: ."to change password");
1701: &Failure( $client, "non_authorized\n",$userinput);
1702: }
1703: } elsif ($howpwd eq 'unix') {
1704: # Unix means we have to access /etc/password
1705: &Debug("auth is unix");
1706: my $execdir=$perlvar{'lonDaemons'};
1707: &Debug("Opening lcpasswd pipeline");
1708: my $pf = IO::File->new("|$execdir/lcpasswd > "
1709: ."$perlvar{'lonDaemons'}"
1710: ."/logs/lcpasswd.log");
1711: print $pf "$uname\n$npass\n$npass\n";
1712: close $pf;
1713: my $err = $?;
1714: my $result = ($err>0 ? 'pwchange_failure' : 'ok');
1715: &logthis("Result of password change for $uname: ".
1716: &lcpasswdstrerror($?));
1717: &Reply($client, "$result\n", $userinput);
1718: } else {
1719: # this just means that the current password mode is not
1720: # one we know how to change (e.g the kerberos auth modes or
1721: # locally written auth handler).
1722: #
1723: &Failure( $client, "auth_mode_error\n", $userinput);
1724: }
1725:
1726: } else {
1727: &Failure( $client, "non_authorized\n", $userinput);
1728: }
1729:
1730: return 1;
1731: }
1732: ®ister_handler("passwd", \&change_password_handler, 1, 1, 0);
1733:
1734: #
1735: # Create a new user. User in this case means a lon-capa user.
1736: # The user must either already exist in some authentication realm
1737: # like kerberos or the /etc/passwd. If not, a user completely local to
1738: # this loncapa system is created.
1739: #
1740: # Parameters:
1741: # $cmd - The command that got us here.
1742: # $tail - Tail of the command (remaining parameters).
1743: # $client - File descriptor connected to client.
1744: # Returns
1745: # 0 - Requested to exit, caller should shut down.
1746: # 1 - Continue processing.
1747: # Implicit inputs:
1748: # The authentication systems describe above have their own forms of implicit
1749: # input into the authentication process that are described above.
1750: sub add_user_handler {
1751:
1752: my ($cmd, $tail, $client) = @_;
1753:
1754:
1755: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1756: my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
1757:
1758: &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
1759:
1760:
1761: if($udom eq $currentdomainid) { # Reject new users for other domains...
1762:
1763: my $oldumask=umask(0077);
1764: chomp($npass);
1765: $npass=&unescape($npass);
1766: my $passfilename = &password_path($udom, $uname);
1767: &Debug("Password file created will be:".$passfilename);
1768: if (-e $passfilename) {
1769: &Failure( $client, "already_exists\n", $userinput);
1770: } else {
1771: my $fperror='';
1772: if (!&mkpath($passfilename)) {
1773: $fperror="error: ".($!+0)." mkdir failed while attempting "
1774: ."makeuser";
1775: }
1776: unless ($fperror) {
1777: my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
1778: &Reply($client, $result, $userinput); #BUGBUG - could be fail
1779: } else {
1780: &Failure($client, "$fperror\n", $userinput);
1781: }
1782: }
1783: umask($oldumask);
1784: } else {
1785: &Failure($client, "not_right_domain\n",
1786: $userinput); # Even if we are multihomed.
1787:
1788: }
1789: return 1;
1790:
1791: }
1792: ®ister_handler("makeuser", \&add_user_handler, 1, 1, 0);
1793:
1794: #
1795: # Change the authentication method of a user. Note that this may
1796: # also implicitly change the user's password if, for example, the user is
1797: # joining an existing authentication realm. Known authentication realms at
1798: # this time are:
1799: # internal - Purely internal password file (only loncapa knows this user)
1800: # local - Institutionally written authentication module.
1801: # unix - Unix user (/etc/passwd with or without /etc/shadow).
1802: # kerb4 - kerberos version 4
1803: # kerb5 - kerberos version 5
1804: #
1805: # Parameters:
1806: # $cmd - The command that got us here.
1807: # $tail - Tail of the command (remaining parameters).
1808: # $client - File descriptor connected to client.
1809: # Returns
1810: # 0 - Requested to exit, caller should shut down.
1811: # 1 - Continue processing.
1812: # Implicit inputs:
1813: # The authentication systems describe above have their own forms of implicit
1814: # input into the authentication process that are described above.
1815: #
1816: sub change_authentication_handler {
1817:
1818: my ($cmd, $tail, $client) = @_;
1819:
1820: my $userinput = "$cmd:$tail"; # Reconstruct user input.
1821:
1822: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1823: &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
1824: if ($udom ne $currentdomainid) {
1825: &Failure( $client, "not_right_domain\n", $client);
1826: } else {
1827:
1828: chomp($npass);
1829:
1830: $npass=&unescape($npass);
1831: my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
1832: my $passfilename = &password_path($udom, $uname);
1833: if ($passfilename) { # Not allowed to create a new user!!
1834: my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
1835: #
1836: # If the current auth mode is internal, and the old auth mode was
1837: # unix, or krb*, and the user is an author for this domain,
1838: # re-run manage_permissions for that role in order to be able
1839: # to take ownership of the construction space back to www:www
1840: #
1841:
1842: if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
1843: (($oldauth =~ /^internal/) && ($umode eq "unix")) ) {
1844: if(&is_author($udom, $uname)) {
1845: &Debug(" Need to manage author permissions...");
1846: &manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
1847: }
1848: }
1849:
1850:
1851: &Reply($client, $result, $userinput);
1852: } else {
1853: &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
1854: }
1855: }
1856: return 1;
1857: }
1858: ®ister_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
1859:
1860: #
1861: # Determines if this is the home server for a user. The home server
1862: # for a user will have his/her lon-capa passwd file. Therefore all we need
1863: # to do is determine if this file exists.
1864: #
1865: # Parameters:
1866: # $cmd - The command that got us here.
1867: # $tail - Tail of the command (remaining parameters).
1868: # $client - File descriptor connected to client.
1869: # Returns
1870: # 0 - Requested to exit, caller should shut down.
1871: # 1 - Continue processing.
1872: # Implicit inputs:
1873: # The authentication systems describe above have their own forms of implicit
1874: # input into the authentication process that are described above.
1875: #
1876: sub is_home_handler {
1877: my ($cmd, $tail, $client) = @_;
1878:
1879: my $userinput = "$cmd:$tail";
1880:
1881: my ($udom,$uname)=split(/:/,$tail);
1882: chomp($uname);
1883: my $passfile = &password_filename($udom, $uname);
1884: if($passfile) {
1885: &Reply( $client, "found\n", $userinput);
1886: } else {
1887: &Failure($client, "not_found\n", $userinput);
1888: }
1889: return 1;
1890: }
1891: ®ister_handler("home", \&is_home_handler, 0,1,0);
1892:
1893: #
1894: # Process an update request for a resource?? I think what's going on here is
1895: # that a resource has been modified that we hold a subscription to.
1896: # If the resource is not local, then we must update, or at least invalidate our
1897: # cached copy of the resource.
1898: # FUTURE WORK:
1899: # I need to look at this logic carefully. My druthers would be to follow
1900: # typical caching logic, and simple invalidate the cache, drop any subscription
1901: # an let the next fetch start the ball rolling again... however that may
1902: # actually be more difficult than it looks given the complex web of
1903: # proxy servers.
1904: # Parameters:
1905: # $cmd - The command that got us here.
1906: # $tail - Tail of the command (remaining parameters).
1907: # $client - File descriptor connected to client.
1908: # Returns
1909: # 0 - Requested to exit, caller should shut down.
1910: # 1 - Continue processing.
1911: # Implicit inputs:
1912: # The authentication systems describe above have their own forms of implicit
1913: # input into the authentication process that are described above.
1914: #
1915: sub update_resource_handler {
1916:
1917: my ($cmd, $tail, $client) = @_;
1918:
1919: my $userinput = "$cmd:$tail";
1920:
1921: my $fname= $tail; # This allows interactive testing
1922:
1923:
1924: my $ownership=ishome($fname);
1925: if ($ownership eq 'not_owner') {
1926: if (-e $fname) {
1927: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
1928: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
1929: my $now=time;
1930: my $since=$now-$atime;
1931: if ($since>$perlvar{'lonExpire'}) {
1932: my $reply=&reply("unsub:$fname","$clientname");
1933: unlink("$fname");
1934: } else {
1935: my $transname="$fname.in.transfer";
1936: my $remoteurl=&reply("sub:$fname","$clientname");
1937: my $response;
1938: alarm(120);
1939: {
1940: my $ua=new LWP::UserAgent;
1941: my $request=new HTTP::Request('GET',"$remoteurl");
1942: $response=$ua->request($request,$transname);
1943: }
1944: alarm(0);
1945: if ($response->is_error()) {
1946: unlink($transname);
1947: my $message=$response->status_line;
1948: &logthis("LWP GET: $message for $fname ($remoteurl)");
1949: } else {
1950: if ($remoteurl!~/\.meta$/) {
1951: alarm(120);
1952: {
1953: my $ua=new LWP::UserAgent;
1954: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
1955: my $mresponse=$ua->request($mrequest,$fname.'.meta');
1956: if ($mresponse->is_error()) {
1957: unlink($fname.'.meta');
1958: }
1959: }
1960: alarm(0);
1961: }
1962: rename($transname,$fname);
1963: }
1964: }
1965: &Reply( $client, "ok\n", $userinput);
1966: } else {
1967: &Failure($client, "not_found\n", $userinput);
1968: }
1969: } else {
1970: &Failure($client, "rejected\n", $userinput);
1971: }
1972: return 1;
1973: }
1974: ®ister_handler("update", \&update_resource_handler, 0 ,1, 0);
1975:
1976: #
1977: # Fetch a user file from a remote server to the user's home directory
1978: # userfiles subdir.
1979: # Parameters:
1980: # $cmd - The command that got us here.
1981: # $tail - Tail of the command (remaining parameters).
1982: # $client - File descriptor connected to client.
1983: # Returns
1984: # 0 - Requested to exit, caller should shut down.
1985: # 1 - Continue processing.
1986: #
1987: sub fetch_user_file_handler {
1988:
1989: my ($cmd, $tail, $client) = @_;
1990:
1991: my $userinput = "$cmd:$tail";
1992: my $fname = $tail;
1993: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
1994: my $udir=&propath($udom,$uname).'/userfiles';
1995: unless (-e $udir) {
1996: mkdir($udir,0770);
1997: }
1998: Debug("fetch user file for $fname");
1999: if (-e $udir) {
2000: $ufile=~s/^[\.\~]+//;
2001:
2002: # IF necessary, create the path right down to the file.
2003: # Note that any regular files in the way of this path are
2004: # wiped out to deal with some earlier folly of mine.
2005:
2006: if (!&mkpath($udir.'/'.$ufile)) {
2007: &Failure($client, "unable_to_create\n", $userinput);
2008: }
2009:
2010: my $destname=$udir.'/'.$ufile;
2011: my $transname=$udir.'/'.$ufile.'.in.transit';
2012: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
2013: my $response;
2014: Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
2015: alarm(120);
2016: {
2017: my $ua=new LWP::UserAgent;
2018: my $request=new HTTP::Request('GET',"$remoteurl");
2019: $response=$ua->request($request,$transname);
2020: }
2021: alarm(0);
2022: if ($response->is_error()) {
2023: unlink($transname);
2024: my $message=$response->status_line;
2025: &logthis("LWP GET: $message for $fname ($remoteurl)");
2026: &Failure($client, "failed\n", $userinput);
2027: } else {
2028: Debug("Renaming $transname to $destname");
2029: if (!rename($transname,$destname)) {
2030: &logthis("Unable to move $transname to $destname");
2031: unlink($transname);
2032: &Failure($client, "failed\n", $userinput);
2033: } else {
2034: &Reply($client, "ok\n", $userinput);
2035: }
2036: }
2037: } else {
2038: &Failure($client, "not_home\n", $userinput);
2039: }
2040: return 1;
2041: }
2042: ®ister_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
2043:
2044: #
2045: # Remove a file from a user's home directory userfiles subdirectory.
2046: # Parameters:
2047: # cmd - the Lond request keyword that got us here.
2048: # tail - the part of the command past the keyword.
2049: # client- File descriptor connected with the client.
2050: #
2051: # Returns:
2052: # 1 - Continue processing.
2053: sub remove_user_file_handler {
2054: my ($cmd, $tail, $client) = @_;
2055:
2056: my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2057:
2058: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
2059: if ($ufile =~m|/\.\./|) {
2060: # any files paths with /../ in them refuse
2061: # to deal with
2062: &Failure($client, "refused\n", "$cmd:$tail");
2063: } else {
2064: my $udir = &propath($udom,$uname);
2065: if (-e $udir) {
2066: my $file=$udir.'/userfiles/'.$ufile;
2067: if (-e $file) {
2068: #
2069: # If the file is a regular file unlink is fine...
2070: # However it's possible the client wants a dir.
2071: # removed, in which case rmdir is more approprate:
2072: #
2073: if (-f $file){
2074: unlink($file);
2075: } elsif(-d $file) {
2076: rmdir($file);
2077: }
2078: if (-e $file) {
2079: # File is still there after we deleted it ?!?
2080:
2081: &Failure($client, "failed\n", "$cmd:$tail");
2082: } else {
2083: &Reply($client, "ok\n", "$cmd:$tail");
2084: }
2085: } else {
2086: &Failure($client, "not_found\n", "$cmd:$tail");
2087: }
2088: } else {
2089: &Failure($client, "not_home\n", "$cmd:$tail");
2090: }
2091: }
2092: return 1;
2093: }
2094: ®ister_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
2095:
2096: #
2097: # make a directory in a user's home directory userfiles subdirectory.
2098: # Parameters:
2099: # cmd - the Lond request keyword that got us here.
2100: # tail - the part of the command past the keyword.
2101: # client- File descriptor connected with the client.
2102: #
2103: # Returns:
2104: # 1 - Continue processing.
2105: sub mkdir_user_file_handler {
2106: my ($cmd, $tail, $client) = @_;
2107:
2108: my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2109: $dir=&unescape($dir);
2110: my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
2111: if ($ufile =~m|/\.\./|) {
2112: # any files paths with /../ in them refuse
2113: # to deal with
2114: &Failure($client, "refused\n", "$cmd:$tail");
2115: } else {
2116: my $udir = &propath($udom,$uname);
2117: if (-e $udir) {
2118: my $newdir=$udir.'/userfiles/'.$ufile.'/';
2119: if (!&mkpath($newdir)) {
2120: &Failure($client, "failed\n", "$cmd:$tail");
2121: }
2122: &Reply($client, "ok\n", "$cmd:$tail");
2123: } else {
2124: &Failure($client, "not_home\n", "$cmd:$tail");
2125: }
2126: }
2127: return 1;
2128: }
2129: ®ister_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
2130:
2131: #
2132: # rename a file in a user's home directory userfiles subdirectory.
2133: # Parameters:
2134: # cmd - the Lond request keyword that got us here.
2135: # tail - the part of the command past the keyword.
2136: # client- File descriptor connected with the client.
2137: #
2138: # Returns:
2139: # 1 - Continue processing.
2140: sub rename_user_file_handler {
2141: my ($cmd, $tail, $client) = @_;
2142:
2143: my ($udom,$uname,$old,$new) = split(/:/, $tail);
2144: $old=&unescape($old);
2145: $new=&unescape($new);
2146: if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
2147: # any files paths with /../ in them refuse to deal with
2148: &Failure($client, "refused\n", "$cmd:$tail");
2149: } else {
2150: my $udir = &propath($udom,$uname);
2151: if (-e $udir) {
2152: my $oldfile=$udir.'/userfiles/'.$old;
2153: my $newfile=$udir.'/userfiles/'.$new;
2154: if (-e $newfile) {
2155: &Failure($client, "exists\n", "$cmd:$tail");
2156: } elsif (! -e $oldfile) {
2157: &Failure($client, "not_found\n", "$cmd:$tail");
2158: } else {
2159: if (!rename($oldfile,$newfile)) {
2160: &Failure($client, "failed\n", "$cmd:$tail");
2161: } else {
2162: &Reply($client, "ok\n", "$cmd:$tail");
2163: }
2164: }
2165: } else {
2166: &Failure($client, "not_home\n", "$cmd:$tail");
2167: }
2168: }
2169: return 1;
2170: }
2171: ®ister_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
2172:
2173: #
2174: # Authenticate access to a user file by checking that the token the user's
2175: # passed also exists in their session file
2176: #
2177: # Parameters:
2178: # cmd - The request keyword that dispatched to tus.
2179: # tail - The tail of the request (colon separated parameters).
2180: # client - Filehandle open on the client.
2181: # Return:
2182: # 1.
2183: sub token_auth_user_file_handler {
2184: my ($cmd, $tail, $client) = @_;
2185:
2186: my ($fname, $session) = split(/:/, $tail);
2187:
2188: chomp($session);
2189: my $reply="non_auth\n";
2190: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
2191: $session.'.id')) {
2192: while (my $line=<ENVIN>) {
2193: if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply="ok\n"; }
2194: }
2195: close(ENVIN);
2196: &Reply($client, $reply, "$cmd:$tail");
2197: } else {
2198: &Failure($client, "invalid_token\n", "$cmd:$tail");
2199: }
2200: return 1;
2201:
2202: }
2203: ®ister_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
2204:
2205: #
2206: # Unsubscribe from a resource.
2207: #
2208: # Parameters:
2209: # $cmd - The command that got us here.
2210: # $tail - Tail of the command (remaining parameters).
2211: # $client - File descriptor connected to client.
2212: # Returns
2213: # 0 - Requested to exit, caller should shut down.
2214: # 1 - Continue processing.
2215: #
2216: sub unsubscribe_handler {
2217: my ($cmd, $tail, $client) = @_;
2218:
2219: my $userinput= "$cmd:$tail";
2220:
2221: my ($fname) = split(/:/,$tail); # Split in case there's extrs.
2222:
2223: &Debug("Unsubscribing $fname");
2224: if (-e $fname) {
2225: &Debug("Exists");
2226: &Reply($client, &unsub($fname,$clientip), $userinput);
2227: } else {
2228: &Failure($client, "not_found\n", $userinput);
2229: }
2230: return 1;
2231: }
2232: ®ister_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
2233:
2234: # Subscribe to a resource
2235: #
2236: # Parameters:
2237: # $cmd - The command that got us here.
2238: # $tail - Tail of the command (remaining parameters).
2239: # $client - File descriptor connected to client.
2240: # Returns
2241: # 0 - Requested to exit, caller should shut down.
2242: # 1 - Continue processing.
2243: #
2244: sub subscribe_handler {
2245: my ($cmd, $tail, $client)= @_;
2246:
2247: my $userinput = "$cmd:$tail";
2248:
2249: &Reply( $client, &subscribe($userinput,$clientip), $userinput);
2250:
2251: return 1;
2252: }
2253: ®ister_handler("sub", \&subscribe_handler, 0, 1, 0);
2254:
2255: #
2256: # Determine the version of a resource (?) Or is it return
2257: # the top version of the resource? Not yet clear from the
2258: # code in currentversion.
2259: #
2260: # Parameters:
2261: # $cmd - The command that got us here.
2262: # $tail - Tail of the command (remaining parameters).
2263: # $client - File descriptor connected to client.
2264: # Returns
2265: # 0 - Requested to exit, caller should shut down.
2266: # 1 - Continue processing.
2267: #
2268: sub current_version_handler {
2269: my ($cmd, $tail, $client) = @_;
2270:
2271: my $userinput= "$cmd:$tail";
2272:
2273: my $fname = $tail;
2274: &Reply( $client, ¤tversion($fname)."\n", $userinput);
2275: return 1;
2276:
2277: }
2278: ®ister_handler("currentversion", \¤t_version_handler, 0, 1, 0);
2279:
2280: # Make an entry in a user's activity log.
2281: #
2282: # Parameters:
2283: # $cmd - The command that got us here.
2284: # $tail - Tail of the command (remaining parameters).
2285: # $client - File descriptor connected to client.
2286: # Returns
2287: # 0 - Requested to exit, caller should shut down.
2288: # 1 - Continue processing.
2289: #
2290: sub activity_log_handler {
2291: my ($cmd, $tail, $client) = @_;
2292:
2293:
2294: my $userinput= "$cmd:$tail";
2295:
2296: my ($udom,$uname,$what)=split(/:/,$tail);
2297: chomp($what);
2298: my $proname=&propath($udom,$uname);
2299: my $now=time;
2300: my $hfh;
2301: if ($hfh=IO::File->new(">>$proname/activity.log")) {
2302: print $hfh "$now:$clientname:$what\n";
2303: &Reply( $client, "ok\n", $userinput);
2304: } else {
2305: &Failure($client, "error: ".($!+0)." IO::File->new Failed "
2306: ."while attempting log\n",
2307: $userinput);
2308: }
2309:
2310: return 1;
2311: }
2312: ®ister_handler("log", \&activity_log_handler, 0, 1, 0);
2313:
2314: #
2315: # Put a namespace entry in a user profile hash.
2316: # My druthers would be for this to be an encrypted interaction too.
2317: # anything that might be an inadvertent covert channel about either
2318: # user authentication or user personal information....
2319: #
2320: # Parameters:
2321: # $cmd - The command that got us here.
2322: # $tail - Tail of the command (remaining parameters).
2323: # $client - File descriptor connected to client.
2324: # Returns
2325: # 0 - Requested to exit, caller should shut down.
2326: # 1 - Continue processing.
2327: #
2328: sub put_user_profile_entry {
2329: my ($cmd, $tail, $client) = @_;
2330:
2331: my $userinput = "$cmd:$tail";
2332:
2333: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
2334: if ($namespace ne 'roles') {
2335: chomp($what);
2336: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2337: &GDBM_WRCREAT(),"P",$what);
2338: if($hashref) {
2339: my @pairs=split(/\&/,$what);
2340: foreach my $pair (@pairs) {
2341: my ($key,$value)=split(/=/,$pair);
2342: $hashref->{$key}=$value;
2343: }
2344: if (untie(%$hashref)) {
2345: &Reply( $client, "ok\n", $userinput);
2346: } else {
2347: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2348: "while attempting put\n",
2349: $userinput);
2350: }
2351: } else {
2352: &Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
2353: "while attempting put\n", $userinput);
2354: }
2355: } else {
2356: &Failure( $client, "refused\n", $userinput);
2357: }
2358:
2359: return 1;
2360: }
2361: ®ister_handler("put", \&put_user_profile_entry, 0, 1, 0);
2362:
2363: # Put a piece of new data in hash, returns error if entry already exists
2364: # Parameters:
2365: # $cmd - The command that got us here.
2366: # $tail - Tail of the command (remaining parameters).
2367: # $client - File descriptor connected to client.
2368: # Returns
2369: # 0 - Requested to exit, caller should shut down.
2370: # 1 - Continue processing.
2371: #
2372: sub newput_user_profile_entry {
2373: my ($cmd, $tail, $client) = @_;
2374:
2375: my $userinput = "$cmd:$tail";
2376:
2377: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
2378: if ($namespace eq 'roles') {
2379: &Failure( $client, "refused\n", $userinput);
2380: return 1;
2381: }
2382:
2383: chomp($what);
2384:
2385: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2386: &GDBM_WRCREAT(),"N",$what);
2387: if(!$hashref) {
2388: &Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
2389: "while attempting put\n", $userinput);
2390: return 1;
2391: }
2392:
2393: my @pairs=split(/\&/,$what);
2394: foreach my $pair (@pairs) {
2395: my ($key,$value)=split(/=/,$pair);
2396: if (exists($hashref->{$key})) {
2397: &Failure($client, "key_exists: ".$key."\n",$userinput);
2398: return 1;
2399: }
2400: }
2401:
2402: foreach my $pair (@pairs) {
2403: my ($key,$value)=split(/=/,$pair);
2404: $hashref->{$key}=$value;
2405: }
2406:
2407: if (untie(%$hashref)) {
2408: &Reply( $client, "ok\n", $userinput);
2409: } else {
2410: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2411: "while attempting put\n",
2412: $userinput);
2413: }
2414: return 1;
2415: }
2416: ®ister_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
2417:
2418: #
2419: # Increment a profile entry in the user history file.
2420: # The history contains keyword value pairs. In this case,
2421: # The value itself is a pair of numbers. The first, the current value
2422: # the second an increment that this function applies to the current
2423: # value.
2424: #
2425: # Parameters:
2426: # $cmd - The command that got us here.
2427: # $tail - Tail of the command (remaining parameters).
2428: # $client - File descriptor connected to client.
2429: # Returns
2430: # 0 - Requested to exit, caller should shut down.
2431: # 1 - Continue processing.
2432: #
2433: sub increment_user_value_handler {
2434: my ($cmd, $tail, $client) = @_;
2435:
2436: my $userinput = "$cmd:$tail";
2437:
2438: my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
2439: if ($namespace ne 'roles') {
2440: chomp($what);
2441: my $hashref = &tie_user_hash($udom, $uname,
2442: $namespace, &GDBM_WRCREAT(),
2443: "P",$what);
2444: if ($hashref) {
2445: my @pairs=split(/\&/,$what);
2446: foreach my $pair (@pairs) {
2447: my ($key,$value)=split(/=/,$pair);
2448: $value = &unescape($value);
2449: # We could check that we have a number...
2450: if (! defined($value) || $value eq '') {
2451: $value = 1;
2452: }
2453: $hashref->{$key}+=$value;
2454: if ($namespace eq 'nohist_resourcetracker') {
2455: if ($hashref->{$key} < 0) {
2456: $hashref->{$key} = 0;
2457: }
2458: }
2459: }
2460: if (untie(%$hashref)) {
2461: &Reply( $client, "ok\n", $userinput);
2462: } else {
2463: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2464: "while attempting inc\n", $userinput);
2465: }
2466: } else {
2467: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2468: "while attempting inc\n", $userinput);
2469: }
2470: } else {
2471: &Failure($client, "refused\n", $userinput);
2472: }
2473:
2474: return 1;
2475: }
2476: ®ister_handler("inc", \&increment_user_value_handler, 0, 1, 0);
2477:
2478: #
2479: # Put a new role for a user. Roles are LonCAPA's packaging of permissions.
2480: # Each 'role' a user has implies a set of permissions. Adding a new role
2481: # for a person grants the permissions packaged with that role
2482: # to that user when the role is selected.
2483: #
2484: # Parameters:
2485: # $cmd - The command string (rolesput).
2486: # $tail - The remainder of the request line. For rolesput this
2487: # consists of a colon separated list that contains:
2488: # The domain and user that is granting the role (logged).
2489: # The domain and user that is getting the role.
2490: # The roles being granted as a set of & separated pairs.
2491: # each pair a key value pair.
2492: # $client - File descriptor connected to the client.
2493: # Returns:
2494: # 0 - If the daemon should exit
2495: # 1 - To continue processing.
2496: #
2497: #
2498: sub roles_put_handler {
2499: my ($cmd, $tail, $client) = @_;
2500:
2501: my $userinput = "$cmd:$tail";
2502:
2503: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail);
2504:
2505:
2506: my $namespace='roles';
2507: chomp($what);
2508: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2509: &GDBM_WRCREAT(), "P",
2510: "$exedom:$exeuser:$what");
2511: #
2512: # Log the attempt to set a role. The {}'s here ensure that the file
2513: # handle is open for the minimal amount of time. Since the flush
2514: # is done on close this improves the chances the log will be an un-
2515: # corrupted ordered thing.
2516: if ($hashref) {
2517: my $pass_entry = &get_auth_type($udom, $uname);
2518: my ($auth_type,$pwd) = split(/:/, $pass_entry);
2519: $auth_type = $auth_type.":";
2520: my @pairs=split(/\&/,$what);
2521: foreach my $pair (@pairs) {
2522: my ($key,$value)=split(/=/,$pair);
2523: &manage_permissions($key, $udom, $uname,
2524: $auth_type);
2525: $hashref->{$key}=$value;
2526: }
2527: if (untie($hashref)) {
2528: &Reply($client, "ok\n", $userinput);
2529: } else {
2530: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2531: "while attempting rolesput\n", $userinput);
2532: }
2533: } else {
2534: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2535: "while attempting rolesput\n", $userinput);
2536: }
2537: return 1;
2538: }
2539: ®ister_handler("rolesput", \&roles_put_handler, 1,1,0); # Encoded client only.
2540:
2541: #
2542: # Deletes (removes) a role for a user. This is equivalent to removing
2543: # a permissions package associated with the role from the user's profile.
2544: #
2545: # Parameters:
2546: # $cmd - The command (rolesdel)
2547: # $tail - The remainder of the request line. This consists
2548: # of:
2549: # The domain and user requesting the change (logged)
2550: # The domain and user being changed.
2551: # The roles being revoked. These are shipped to us
2552: # as a bunch of & separated role name keywords.
2553: # $client - The file handle open on the client.
2554: # Returns:
2555: # 1 - Continue processing
2556: # 0 - Exit.
2557: #
2558: sub roles_delete_handler {
2559: my ($cmd, $tail, $client) = @_;
2560:
2561: my $userinput = "$cmd:$tail";
2562:
2563: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
2564: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
2565: "what = ".$what);
2566: my $namespace='roles';
2567: chomp($what);
2568: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2569: &GDBM_WRCREAT(), "D",
2570: "$exedom:$exeuser:$what");
2571:
2572: if ($hashref) {
2573: my @rolekeys=split(/\&/,$what);
2574:
2575: foreach my $key (@rolekeys) {
2576: delete $hashref->{$key};
2577: }
2578: if (untie(%$hashref)) {
2579: &Reply($client, "ok\n", $userinput);
2580: } else {
2581: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2582: "while attempting rolesdel\n", $userinput);
2583: }
2584: } else {
2585: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2586: "while attempting rolesdel\n", $userinput);
2587: }
2588:
2589: return 1;
2590: }
2591: ®ister_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
2592:
2593: # Unencrypted get from a user's profile database. See
2594: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
2595: # This function retrieves a keyed item from a specific named database in the
2596: # user's directory.
2597: #
2598: # Parameters:
2599: # $cmd - Command request keyword (get).
2600: # $tail - Tail of the command. This is a colon separated list
2601: # consisting of the domain and username that uniquely
2602: # identifies the profile,
2603: # The 'namespace' which selects the gdbm file to
2604: # do the lookup in,
2605: # & separated list of keys to lookup. Note that
2606: # the values are returned as an & separated list too.
2607: # $client - File descriptor open on the client.
2608: # Returns:
2609: # 1 - Continue processing.
2610: # 0 - Exit.
2611: #
2612: sub get_profile_entry {
2613: my ($cmd, $tail, $client) = @_;
2614:
2615: my $userinput= "$cmd:$tail";
2616:
2617: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2618: chomp($what);
2619:
2620: my $replystring = read_profile($udom, $uname, $namespace, $what);
2621: my ($first) = split(/:/,$replystring);
2622: if($first ne "error") {
2623: &Reply($client, "$replystring\n", $userinput);
2624: } else {
2625: &Failure($client, $replystring." while attempting get\n", $userinput);
2626: }
2627: return 1;
2628:
2629:
2630: }
2631: ®ister_handler("get", \&get_profile_entry, 0,1,0);
2632:
2633: #
2634: # Process the encrypted get request. Note that the request is sent
2635: # in clear, but the reply is encrypted. This is a small covert channel:
2636: # information about the sensitive keys is given to the snooper. Just not
2637: # information about the values of the sensitive key. Hmm if I wanted to
2638: # know these I'd snoop for the egets. Get the profile item names from them
2639: # and then issue a get for them since there's no enforcement of the
2640: # requirement of an encrypted get for particular profile items. If I
2641: # were re-doing this, I'd force the request to be encrypted as well as the
2642: # reply. I'd also just enforce encrypted transactions for all gets since
2643: # that would prevent any covert channel snooping.
2644: #
2645: # Parameters:
2646: # $cmd - Command keyword of request (eget).
2647: # $tail - Tail of the command. See GetProfileEntry
# for more information about this.
2648: # $client - File open on the client.
2649: # Returns:
2650: # 1 - Continue processing
2651: # 0 - server should exit.
2652: sub get_profile_entry_encrypted {
2653: my ($cmd, $tail, $client) = @_;
2654:
2655: my $userinput = "$cmd:$tail";
2656:
2657: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
2658: chomp($what);
2659: my $qresult = read_profile($udom, $uname, $namespace, $what);
2660: my ($first) = split(/:/, $qresult);
2661: if($first ne "error") {
2662:
2663: if ($cipher) {
2664: my $cmdlength=length($qresult);
2665: $qresult.=" ";
2666: my $encqresult='';
2667: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
2668: $encqresult.= unpack("H16",
2669: $cipher->encrypt(substr($qresult,
2670: $encidx,
2671: 8)));
2672: }
2673: &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
2674: } else {
2675: &Failure( $client, "error:no_key\n", $userinput);
2676: }
2677: } else {
2678: &Failure($client, "$qresult while attempting eget\n", $userinput);
2679:
2680: }
2681:
2682: return 1;
2683: }
2684: ®ister_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
2685:
2686: #
2687: # Deletes a key in a user profile database.
2688: #
2689: # Parameters:
2690: # $cmd - Command keyword (del).
2691: # $tail - Command tail. IN this case a colon
2692: # separated list containing:
2693: # The domain and user that identifies uniquely
2694: # the identity of the user.
2695: # The profile namespace (name of the profile
2696: # database file).
2697: # & separated list of keywords to delete.
2698: # $client - File open on client socket.
2699: # Returns:
2700: # 1 - Continue processing
2701: # 0 - Exit server.
2702: #
2703: #
2704: sub delete_profile_entry {
2705: my ($cmd, $tail, $client) = @_;
2706:
2707: my $userinput = "cmd:$tail";
2708:
2709: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2710: chomp($what);
2711: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2712: &GDBM_WRCREAT(),
2713: "D",$what);
2714: if ($hashref) {
2715: my @keys=split(/\&/,$what);
2716: foreach my $key (@keys) {
2717: delete($hashref->{$key});
2718: }
2719: if (untie(%$hashref)) {
2720: &Reply($client, "ok\n", $userinput);
2721: } else {
2722: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2723: "while attempting del\n", $userinput);
2724: }
2725: } else {
2726: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2727: "while attempting del\n", $userinput);
2728: }
2729: return 1;
2730: }
2731: ®ister_handler("del", \&delete_profile_entry, 0, 1, 0);
2732:
2733: #
2734: # List the set of keys that are defined in a profile database file.
2735: # A successful reply from this will contain an & separated list of
2736: # the keys.
2737: # Parameters:
2738: # $cmd - Command request (keys).
2739: # $tail - Remainder of the request, a colon separated
2740: # list containing domain/user that identifies the
2741: # user being queried, and the database namespace
2742: # (database filename essentially).
2743: # $client - File open on the client.
2744: # Returns:
2745: # 1 - Continue processing.
2746: # 0 - Exit the server.
2747: #
2748: sub get_profile_keys {
2749: my ($cmd, $tail, $client) = @_;
2750:
2751: my $userinput = "$cmd:$tail";
2752:
2753: my ($udom,$uname,$namespace)=split(/:/,$tail);
2754: my $qresult='';
2755: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2756: &GDBM_READER());
2757: if ($hashref) {
2758: foreach my $key (keys %$hashref) {
2759: $qresult.="$key&";
2760: }
2761: if (untie(%$hashref)) {
2762: $qresult=~s/\&$//;
2763: &Reply($client, "$qresult\n", $userinput);
2764: } else {
2765: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2766: "while attempting keys\n", $userinput);
2767: }
2768: } else {
2769: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2770: "while attempting keys\n", $userinput);
2771: }
2772:
2773: return 1;
2774: }
2775: ®ister_handler("keys", \&get_profile_keys, 0, 1, 0);
2776:
2777: #
2778: # Dump the contents of a user profile database.
2779: # Note that this constitutes a very large covert channel too since
2780: # the dump will return sensitive information that is not encrypted.
2781: # The naive security assumption is that the session negotiation ensures
2782: # our client is trusted and I don't believe that's assured at present.
2783: # Sure want badly to go to ssl or tls. Of course if my peer isn't really
2784: # a LonCAPA node they could have negotiated an encryption key too so >sigh<.
2785: #
2786: # Parameters:
2787: # $cmd - The command request keyword (currentdump).
2788: # $tail - Remainder of the request, consisting of a colon
2789: # separated list that has the domain/username and
2790: # the namespace to dump (database file).
2791: # $client - file open on the remote client.
2792: # Returns:
2793: # 1 - Continue processing.
2794: # 0 - Exit the server.
2795: #
2796: sub dump_profile_database {
2797: my ($cmd, $tail, $client) = @_;
2798:
2799: my $userinput = "$cmd:$tail";
2800:
2801: my ($udom,$uname,$namespace) = split(/:/,$tail);
2802: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2803: &GDBM_READER());
2804: if ($hashref) {
2805: # Structure of %data:
2806: # $data{$symb}->{$parameter}=$value;
2807: # $data{$symb}->{'v.'.$parameter}=$version;
2808: # since $parameter will be unescaped, we do not
2809: # have to worry about silly parameter names...
2810:
2811: my $qresult='';
2812: my %data = (); # A hash of anonymous hashes..
2813: while (my ($key,$value) = each(%$hashref)) {
2814: my ($v,$symb,$param) = split(/:/,$key);
2815: next if ($v eq 'version' || $symb eq 'keys');
2816: next if (exists($data{$symb}) &&
2817: exists($data{$symb}->{$param}) &&
2818: $data{$symb}->{'v.'.$param} > $v);
2819: $data{$symb}->{$param}=$value;
2820: $data{$symb}->{'v.'.$param}=$v;
2821: }
2822: if (untie(%$hashref)) {
2823: while (my ($symb,$param_hash) = each(%data)) {
2824: while(my ($param,$value) = each (%$param_hash)){
2825: next if ($param =~ /^v\./); # Ignore versions...
2826: #
2827: # Just dump the symb=value pairs separated by &
2828: #
2829: $qresult.=$symb.':'.$param.'='.$value.'&';
2830: }
2831: }
2832: chop($qresult);
2833: &Reply($client , "$qresult\n", $userinput);
2834: } else {
2835: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2836: "while attempting currentdump\n", $userinput);
2837: }
2838: } else {
2839: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2840: "while attempting currentdump\n", $userinput);
2841: }
2842:
2843: return 1;
2844: }
2845: ®ister_handler("currentdump", \&dump_profile_database, 0, 1, 0);
2846:
2847: #
2848: # Dump a profile database with an optional regular expression
2849: # to match against the keys. In this dump, no effort is made
2850: # to separate symb from version information. Presumably the
2851: # databases that are dumped by this command are of a different
2852: # structure. Need to look at this and improve the documentation of
2853: # both this and the currentdump handler.
2854: # Parameters:
2855: # $cmd - The command keyword.
2856: # $tail - All of the characters after the $cmd:
2857: # These are expected to be a colon
2858: # separated list containing:
2859: # domain/user - identifying the user.
2860: # namespace - identifying the database.
2861: # regexp - optional regular expression
2862: # that is matched against
2863: # database keywords to do
2864: # selective dumps.
2865: # $client - Channel open on the client.
2866: # Returns:
2867: # 1 - Continue processing.
2868: # Side effects:
2869: # response is written to $client.
2870: #
2871: sub dump_with_regexp {
2872: my ($cmd, $tail, $client) = @_;
2873:
2874:
2875: my $userinput = "$cmd:$tail";
2876:
2877: my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
2878: if (defined($regexp)) {
2879: $regexp=&unescape($regexp);
2880: } else {
2881: $regexp='.';
2882: }
2883: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2884: &GDBM_READER());
2885: if ($hashref) {
2886: my $qresult='';
2887: while (my ($key,$value) = each(%$hashref)) {
2888: if ($regexp eq '.') {
2889: $qresult.=$key.'='.$value.'&';
2890: } else {
2891: my $unescapeKey = &unescape($key);
2892: if (eval('$unescapeKey=~/$regexp/')) {
2893: $qresult.="$key=$value&";
2894: }
2895: }
2896: }
2897: if (untie(%$hashref)) {
2898: chop($qresult);
2899: &Reply($client, "$qresult\n", $userinput);
2900: } else {
2901: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2902: "while attempting dump\n", $userinput);
2903: }
2904: } else {
2905: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2906: "while attempting dump\n", $userinput);
2907: }
2908:
2909: return 1;
2910: }
2911: ®ister_handler("dump", \&dump_with_regexp, 0, 1, 0);
2912:
2913: # Store a set of key=value pairs associated with a versioned name.
2914: #
2915: # Parameters:
2916: # $cmd - Request command keyword.
2917: # $tail - Tail of the request. This is a colon
2918: # separated list containing:
2919: # domain/user - User and authentication domain.
2920: # namespace - Name of the database being modified
2921: # rid - Resource keyword to modify.
2922: # what - new value associated with rid.
2923: #
2924: # $client - Socket open on the client.
2925: #
2926: #
2927: # Returns:
2928: # 1 (keep on processing).
2929: # Side-Effects:
2930: # Writes to the client
2931: sub store_handler {
2932: my ($cmd, $tail, $client) = @_;
2933:
2934: my $userinput = "$cmd:$tail";
2935:
2936: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
2937: if ($namespace ne 'roles') {
2938:
2939: chomp($what);
2940: my @pairs=split(/\&/,$what);
2941: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2942: &GDBM_WRCREAT(), "S",
2943: "$rid:$what");
2944: if ($hashref) {
2945: my $now = time;
2946: my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
2947: my $key;
2948: $hashref->{"version:$rid"}++;
2949: my $version=$hashref->{"version:$rid"};
2950: my $allkeys='';
2951: foreach my $pair (@pairs) {
2952: my ($key,$value)=split(/=/,$pair);
2953: $allkeys.=$key.':';
2954: $hashref->{"$version:$rid:$key"}=$value;
2955: }
2956: $hashref->{"$version:$rid:timestamp"}=$now;
2957: $allkeys.='timestamp';
2958: $hashref->{"$version:keys:$rid"}=$allkeys;
2959: if (untie($hashref)) {
2960: &Reply($client, "ok\n", $userinput);
2961: } else {
2962: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2963: "while attempting store\n", $userinput);
2964: }
2965: } else {
2966: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2967: "while attempting store\n", $userinput);
2968: }
2969: } else {
2970: &Failure($client, "refused\n", $userinput);
2971: }
2972:
2973: return 1;
2974: }
2975: ®ister_handler("store", \&store_handler, 0, 1, 0);
2976:
2977: #
2978: # Dump out all versions of a resource that has key=value pairs associated
2979: # with it for each version. These resources are built up via the store
2980: # command.
2981: #
2982: # Parameters:
2983: # $cmd - Command keyword.
2984: # $tail - Remainder of the request which consists of:
2985: # domain/user - User and auth. domain.
2986: # namespace - name of resource database.
2987: # rid - Resource id.
2988: # $client - socket open on the client.
2989: #
2990: # Returns:
2991: # 1 indicating the caller should not yet exit.
2992: # Side-effects:
2993: # Writes a reply to the client.
2994: # The reply is a string of the following shape:
2995: # version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
2996: # Where the 1 above represents version 1.
2997: # this continues for all pairs of keys in all versions.
2998: #
2999: #
3000: #
3001: #
3002: sub restore_handler {
3003: my ($cmd, $tail, $client) = @_;
3004:
3005: my $userinput = "$cmd:$tail"; # Only used for logging purposes.
3006:
3007: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
3008: $namespace=~s/\//\_/g;
3009: $namespace=~s/\W//g;
3010: chomp($rid);
3011: my $proname=&propath($udom,$uname);
3012: my $qresult='';
3013: my %hash;
3014: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
3015: &GDBM_READER(),0640)) {
3016: my $version=$hash{"version:$rid"};
3017: $qresult.="version=$version&";
3018: my $scope;
3019: for ($scope=1;$scope<=$version;$scope++) {
3020: my $vkeys=$hash{"$scope:keys:$rid"};
3021: my @keys=split(/:/,$vkeys);
3022: my $key;
3023: $qresult.="$scope:keys=$vkeys&";
3024: foreach $key (@keys) {
3025: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
3026: }
3027: }
3028: if (untie(%hash)) {
3029: $qresult=~s/\&$//;
3030: &Reply( $client, "$qresult\n", $userinput);
3031: } else {
3032: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3033: "while attempting restore\n", $userinput);
3034: }
3035: } else {
3036: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3037: "while attempting restore\n", $userinput);
3038: }
3039:
3040: return 1;
3041:
3042:
3043: }
3044: ®ister_handler("restore", \&restore_handler, 0,1,0);
3045:
3046: #
3047: # Add a chat message to to a discussion board.
3048: #
3049: # Parameters:
3050: # $cmd - Request keyword.
3051: # $tail - Tail of the command. A colon separated list
3052: # containing:
3053: # cdom - Domain on which the chat board lives
3054: # cnum - Identifier of the discussion group.
3055: # post - Body of the posting.
3056: # $client - Socket open on the client.
3057: # Returns:
3058: # 1 - Indicating caller should keep on processing.
3059: #
3060: # Side-effects:
3061: # writes a reply to the client.
3062: #
3063: #
3064: sub send_chat_handler {
3065: my ($cmd, $tail, $client) = @_;
3066:
3067:
3068: my $userinput = "$cmd:$tail";
3069:
3070: my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
3071: &chat_add($cdom,$cnum,$newpost);
3072: &Reply($client, "ok\n", $userinput);
3073:
3074: return 1;
3075: }
3076: ®ister_handler("chatsend", \&send_chat_handler, 0, 1, 0);
3077:
3078: #
3079: # Retrieve the set of chat messagss from a discussion board.
3080: #
3081: # Parameters:
3082: # $cmd - Command keyword that initiated the request.
3083: # $tail - Remainder of the request after the command
3084: # keyword. In this case a colon separated list of
3085: # chat domain - Which discussion board.
3086: # chat id - Discussion thread(?)
3087: # domain/user - Authentication domain and username
3088: # of the requesting person.
3089: # $client - Socket open on the client program.
3090: # Returns:
3091: # 1 - continue processing
3092: # Side effects:
3093: # Response is written to the client.
3094: #
3095: sub retrieve_chat_handler {
3096: my ($cmd, $tail, $client) = @_;
3097:
3098:
3099: my $userinput = "$cmd:$tail";
3100:
3101: my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
3102: my $reply='';
3103: foreach (&get_chat($cdom,$cnum,$udom,$uname)) {
3104: $reply.=&escape($_).':';
3105: }
3106: $reply=~s/\:$//;
3107: &Reply($client, $reply."\n", $userinput);
3108:
3109:
3110: return 1;
3111: }
3112: ®ister_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
3113:
3114: #
3115: # Initiate a query of an sql database. SQL query repsonses get put in
3116: # a file for later retrieval. This prevents sql query results from
3117: # bottlenecking the system. Note that with loncnew, perhaps this is
3118: # less of an issue since multiple outstanding requests can be concurrently
3119: # serviced.
3120: #
3121: # Parameters:
3122: # $cmd - COmmand keyword that initiated the request.
3123: # $tail - Remainder of the command after the keyword.
3124: # For this function, this consists of a query and
3125: # 3 arguments that are self-documentingly labelled
3126: # in the original arg1, arg2, arg3.
3127: # $client - Socket open on the client.
3128: # Return:
3129: # 1 - Indicating processing should continue.
3130: # Side-effects:
3131: # a reply is written to $client.
3132: #
3133: sub send_query_handler {
3134: my ($cmd, $tail, $client) = @_;
3135:
3136:
3137: my $userinput = "$cmd:$tail";
3138:
3139: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
3140: $query=~s/\n*$//g;
3141: &Reply($client, "". &sql_reply("$clientname\&$query".
3142: "\&$arg1"."\&$arg2"."\&$arg3")."\n",
3143: $userinput);
3144:
3145: return 1;
3146: }
3147: ®ister_handler("querysend", \&send_query_handler, 0, 1, 0);
3148:
3149: #
3150: # Add a reply to an sql query. SQL queries are done asyncrhonously.
3151: # The query is submitted via a "querysend" transaction.
3152: # There it is passed on to the lonsql daemon, queued and issued to
3153: # mysql.
3154: # This transaction is invoked when the sql transaction is complete
3155: # it stores the query results in flie and indicates query completion.
3156: # presumably local software then fetches this response... I'm guessing
3157: # the sequence is: lonc does a querysend, we ask lonsql to do it.
3158: # lonsql on completion of the query interacts with the lond of our
3159: # client to do a query reply storing two files:
3160: # - id - The results of the query.
3161: # - id.end - Indicating the transaction completed.
3162: # NOTE: id is a unique id assigned to the query and querysend time.
3163: # Parameters:
3164: # $cmd - Command keyword that initiated this request.
3165: # $tail - Remainder of the tail. In this case that's a colon
3166: # separated list containing the query Id and the
3167: # results of the query.
3168: # $client - Socket open on the client.
3169: # Return:
3170: # 1 - Indicating that we should continue processing.
3171: # Side effects:
3172: # ok written to the client.
3173: #
3174: sub reply_query_handler {
3175: my ($cmd, $tail, $client) = @_;
3176:
3177:
3178: my $userinput = "$cmd:$tail";
3179:
3180: my ($cmd,$id,$reply)=split(/:/,$userinput);
3181: my $store;
3182: my $execdir=$perlvar{'lonDaemons'};
3183: if ($store=IO::File->new(">$execdir/tmp/$id")) {
3184: $reply=~s/\&/\n/g;
3185: print $store $reply;
3186: close $store;
3187: my $store2=IO::File->new(">$execdir/tmp/$id.end");
3188: print $store2 "done\n";
3189: close $store2;
3190: &Reply($client, "ok\n", $userinput);
3191: } else {
3192: &Failure($client, "error: ".($!+0)
3193: ." IO::File->new Failed ".
3194: "while attempting queryreply\n", $userinput);
3195: }
3196:
3197:
3198: return 1;
3199: }
3200: ®ister_handler("queryreply", \&reply_query_handler, 0, 1, 0);
3201:
3202: #
3203: # Process the courseidput request. Not quite sure what this means
3204: # at the system level sense. It appears a gdbm file in the
3205: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and
3206: # a set of entries made in that database.
3207: #
3208: # Parameters:
3209: # $cmd - The command keyword that initiated this request.
3210: # $tail - Tail of the command. In this case consists of a colon
3211: # separated list contaning the domain to apply this to and
3212: # an ampersand separated list of keyword=value pairs.
3213: # Each value is a colon separated list that includes:
3214: # description, institutional code and course owner.
3215: # For backward compatibility with versions included
3216: # in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
3217: # code and/or course owner are preserved from the existing
3218: # record when writing a new record in response to 1.1 or
3219: # 1.2 implementations of lonnet::flushcourselogs().
3220: #
3221: # $client - Socket open on the client.
3222: # Returns:
3223: # 1 - indicating that processing should continue
3224: #
3225: # Side effects:
3226: # reply is written to the client.
3227: #
3228: sub put_course_id_handler {
3229: my ($cmd, $tail, $client) = @_;
3230:
3231:
3232: my $userinput = "$cmd:$tail";
3233:
3234: my ($udom, $what) = split(/:/, $tail,2);
3235: chomp($what);
3236: my $now=time;
3237: my @pairs=split(/\&/,$what);
3238:
3239: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3240: if ($hashref) {
3241: foreach my $pair (@pairs) {
3242: my ($key,$courseinfo) = split(/=/,$pair,2);
3243: $courseinfo =~ s/=/:/g;
3244:
3245: my @current_items = split(/:/,$hashref->{$key});
3246: shift(@current_items); # remove description
3247: pop(@current_items); # remove last access
3248: my $numcurrent = scalar(@current_items);
3249:
3250: my @new_items = split(/:/,$courseinfo);
3251: my $numnew = scalar(@new_items);
3252: if ($numcurrent > 0) {
3253: if ($numnew == 1) { # flushcourselogs() from 1.1 or earlier
3254: $courseinfo .= ':'.join(':',@current_items);
3255: } elsif ($numnew == 2) { # flushcourselogs() from 1.2.X
3256: $courseinfo .= ':'.$current_items[$numcurrent-1];
3257: }
3258: }
3259: $hashref->{$key}=$courseinfo.':'.$now;
3260: }
3261: if (untie(%$hashref)) {
3262: &Reply( $client, "ok\n", $userinput);
3263: } else {
3264: &Failure($client, "error: ".($!+0)
3265: ." untie(GDBM) Failed ".
3266: "while attempting courseidput\n", $userinput);
3267: }
3268: } else {
3269: &Failure($client, "error: ".($!+0)
3270: ." tie(GDBM) Failed ".
3271: "while attempting courseidput\n", $userinput);
3272: }
3273:
3274:
3275: return 1;
3276: }
3277: ®ister_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
3278:
3279: # Retrieves the value of a course id resource keyword pattern
3280: # defined since a starting date. Both the starting date and the
3281: # keyword pattern are optional. If the starting date is not supplied it
3282: # is treated as the beginning of time. If the pattern is not found,
3283: # it is treatred as "." matching everything.
3284: #
3285: # Parameters:
3286: # $cmd - Command keyword that resulted in us being dispatched.
3287: # $tail - The remainder of the command that, in this case, consists
3288: # of a colon separated list of:
3289: # domain - The domain in which the course database is
3290: # defined.
3291: # since - Optional parameter describing the minimum
3292: # time of definition(?) of the resources that
3293: # will match the dump.
3294: # description - regular expression that is used to filter
3295: # the dump. Only keywords matching this regexp
3296: # will be used.
3297: # institutional code - optional supplied code to filter
3298: # the dump. Only courses with an institutional code
3299: # that match the supplied code will be returned.
3300: # owner - optional supplied username of owner to filter
3301: # the dump. Only courses for which the course
3302: # owner matches the supplied username will be
3303: # returned. Implicit assumption that owner
3304: # is a user in the domain in which the
3305: # course database is defined.
3306: # $client - The socket open on the client.
3307: # Returns:
3308: # 1 - Continue processing.
3309: # Side Effects:
3310: # a reply is written to $client.
3311: sub dump_course_id_handler {
3312: my ($cmd, $tail, $client) = @_;
3313:
3314: my $userinput = "$cmd:$tail";
3315:
3316: my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter) =split(/:/,$tail);
3317: if (defined($description)) {
3318: $description=&unescape($description);
3319: } else {
3320: $description='.';
3321: }
3322: if (defined($instcodefilter)) {
3323: $instcodefilter=&unescape($instcodefilter);
3324: } else {
3325: $instcodefilter='.';
3326: }
3327: if (defined($ownerfilter)) {
3328: $ownerfilter=&unescape($ownerfilter);
3329: } else {
3330: $ownerfilter='.';
3331: }
3332: if (defined($coursefilter)) {
3333: $coursefilter=&unescape($coursefilter);
3334: } else {
3335: $coursefilter='.';
3336: }
3337:
3338: unless (defined($since)) { $since=0; }
3339: my $qresult='';
3340: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3341: if ($hashref) {
3342: while (my ($key,$value) = each(%$hashref)) {
3343: my ($descr,$lasttime,$inst_code,$owner);
3344: my @courseitems = split(/:/,$value);
3345: $lasttime = pop(@courseitems);
3346: ($descr,$inst_code,$owner)=@courseitems;
3347: if ($lasttime<$since) { next; }
3348: my $match = 1;
3349: unless ($description eq '.') {
3350: my $unescapeDescr = &unescape($descr);
3351: unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
3352: $match = 0;
3353: }
3354: }
3355: unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
3356: my $unescapeInstcode = &unescape($inst_code);
3357: unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) {
3358: $match = 0;
3359: }
3360: }
3361: unless ($ownerfilter eq '.' || !defined($ownerfilter)) {
3362: my $unescapeOwner = &unescape($owner);
3363: unless (eval('$unescapeOwner=~/\Q$ownerfilter\E/i')) {
3364: $match = 0;
3365: }
3366: }
3367: unless ($coursefilter eq '.' || !defined($coursefilter)) {
3368: my $unescapeCourse = &unescape($key);
3369: unless (eval('$unescapeCourse=~/^$udom(_)\Q$coursefilter\E$/')) {
3370: $match = 0;
3371: }
3372: }
3373: if ($match == 1) {
3374: $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
3375: }
3376: }
3377: if (untie(%$hashref)) {
3378: chop($qresult);
3379: &Reply($client, "$qresult\n", $userinput);
3380: } else {
3381: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3382: "while attempting courseiddump\n", $userinput);
3383: }
3384: } else {
3385: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3386: "while attempting courseiddump\n", $userinput);
3387: }
3388:
3389:
3390: return 1;
3391: }
3392: ®ister_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
3393:
3394: #
3395: # Puts an id to a domains id database.
3396: #
3397: # Parameters:
3398: # $cmd - The command that triggered us.
3399: # $tail - Remainder of the request other than the command. This is a
3400: # colon separated list containing:
3401: # $domain - The domain for which we are writing the id.
3402: # $pairs - The id info to write... this is and & separated list
3403: # of keyword=value.
3404: # $client - Socket open on the client.
3405: # Returns:
3406: # 1 - Continue processing.
3407: # Side effects:
3408: # reply is written to $client.
3409: #
3410: sub put_id_handler {
3411: my ($cmd,$tail,$client) = @_;
3412:
3413:
3414: my $userinput = "$cmd:$tail";
3415:
3416: my ($udom,$what)=split(/:/,$tail);
3417: chomp($what);
3418: my @pairs=split(/\&/,$what);
3419: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
3420: "P", $what);
3421: if ($hashref) {
3422: foreach my $pair (@pairs) {
3423: my ($key,$value)=split(/=/,$pair);
3424: $hashref->{$key}=$value;
3425: }
3426: if (untie(%$hashref)) {
3427: &Reply($client, "ok\n", $userinput);
3428: } else {
3429: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3430: "while attempting idput\n", $userinput);
3431: }
3432: } else {
3433: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3434: "while attempting idput\n", $userinput);
3435: }
3436:
3437: return 1;
3438: }
3439: ®ister_handler("idput", \&put_id_handler, 0, 1, 0);
3440:
3441: #
3442: # Retrieves a set of id values from the id database.
3443: # Returns an & separated list of results, one for each requested id to the
3444: # client.
3445: #
3446: # Parameters:
3447: # $cmd - Command keyword that caused us to be dispatched.
3448: # $tail - Tail of the command. Consists of a colon separated:
3449: # domain - the domain whose id table we dump
3450: # ids Consists of an & separated list of
3451: # id keywords whose values will be fetched.
3452: # nonexisting keywords will have an empty value.
3453: # $client - Socket open on the client.
3454: #
3455: # Returns:
3456: # 1 - indicating processing should continue.
3457: # Side effects:
3458: # An & separated list of results is written to $client.
3459: #
3460: sub get_id_handler {
3461: my ($cmd, $tail, $client) = @_;
3462:
3463:
3464: my $userinput = "$client:$tail";
3465:
3466: my ($udom,$what)=split(/:/,$tail);
3467: chomp($what);
3468: my @queries=split(/\&/,$what);
3469: my $qresult='';
3470: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
3471: if ($hashref) {
3472: for (my $i=0;$i<=$#queries;$i++) {
3473: $qresult.="$hashref->{$queries[$i]}&";
3474: }
3475: if (untie(%$hashref)) {
3476: $qresult=~s/\&$//;
3477: &Reply($client, "$qresult\n", $userinput);
3478: } else {
3479: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
3480: "while attempting idget\n",$userinput);
3481: }
3482: } else {
3483: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3484: "while attempting idget\n",$userinput);
3485: }
3486:
3487: return 1;
3488: }
3489: ®ister_handler("idget", \&get_id_handler, 0, 1, 0);
3490:
3491: #
3492: # Process the tmpput command I'm not sure what this does.. Seems to
3493: # create a file in the lonDaemons/tmp directory of the form $id.tmp
3494: # where Id is the client's ip concatenated with a sequence number.
3495: # The file will contain some value that is passed in. Is this e.g.
3496: # a login token?
3497: #
3498: # Parameters:
3499: # $cmd - The command that got us dispatched.
3500: # $tail - The remainder of the request following $cmd:
3501: # In this case this will be the contents of the file.
3502: # $client - Socket connected to the client.
3503: # Returns:
3504: # 1 indicating processing can continue.
3505: # Side effects:
3506: # A file is created in the local filesystem.
3507: # A reply is sent to the client.
3508: sub tmp_put_handler {
3509: my ($cmd, $what, $client) = @_;
3510:
3511: my $userinput = "$cmd:$what"; # Reconstruct for logging.
3512:
3513:
3514: my $store;
3515: $tmpsnum++;
3516: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
3517: $id=~s/\W/\_/g;
3518: $what=~s/\n//g;
3519: my $execdir=$perlvar{'lonDaemons'};
3520: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
3521: print $store $what;
3522: close $store;
3523: &Reply($client, "$id\n", $userinput);
3524: } else {
3525: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
3526: "while attempting tmpput\n", $userinput);
3527: }
3528: return 1;
3529:
3530: }
3531: ®ister_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
3532:
3533: # Processes the tmpget command. This command returns the contents
3534: # of a temporary resource file(?) created via tmpput.
3535: #
3536: # Paramters:
3537: # $cmd - Command that got us dispatched.
3538: # $id - Tail of the command, contain the id of the resource
3539: # we want to fetch.
3540: # $client - socket open on the client.
3541: # Return:
3542: # 1 - Inidcating processing can continue.
3543: # Side effects:
3544: # A reply is sent to the client.
3545: #
3546: sub tmp_get_handler {
3547: my ($cmd, $id, $client) = @_;
3548:
3549: my $userinput = "$cmd:$id";
3550:
3551:
3552: $id=~s/\W/\_/g;
3553: my $store;
3554: my $execdir=$perlvar{'lonDaemons'};
3555: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
3556: my $reply=<$store>;
3557: &Reply( $client, "$reply\n", $userinput);
3558: close $store;
3559: } else {
3560: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
3561: "while attempting tmpget\n", $userinput);
3562: }
3563:
3564: return 1;
3565: }
3566: ®ister_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
3567:
3568: #
3569: # Process the tmpdel command. This command deletes a temp resource
3570: # created by the tmpput command.
3571: #
3572: # Parameters:
3573: # $cmd - Command that got us here.
3574: # $id - Id of the temporary resource created.
3575: # $client - socket open on the client process.
3576: #
3577: # Returns:
3578: # 1 - Indicating processing should continue.
3579: # Side Effects:
3580: # A file is deleted
3581: # A reply is sent to the client.
3582: sub tmp_del_handler {
3583: my ($cmd, $id, $client) = @_;
3584:
3585: my $userinput= "$cmd:$id";
3586:
3587: chomp($id);
3588: $id=~s/\W/\_/g;
3589: my $execdir=$perlvar{'lonDaemons'};
3590: if (unlink("$execdir/tmp/$id.tmp")) {
3591: &Reply($client, "ok\n", $userinput);
3592: } else {
3593: &Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
3594: "while attempting tmpdel\n", $userinput);
3595: }
3596:
3597: return 1;
3598:
3599: }
3600: ®ister_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
3601:
3602: #
3603: # Processes the setannounce command. This command
3604: # creates a file named announce.txt in the top directory of
3605: # the documentn root and sets its contents. The announce.txt file is
3606: # printed in its entirety at the LonCAPA login page. Note:
3607: # once the announcement.txt fileis created it cannot be deleted.
3608: # However, setting the contents of the file to empty removes the
3609: # announcement from the login page of loncapa so who cares.
3610: #
3611: # Parameters:
3612: # $cmd - The command that got us dispatched.
3613: # $announcement - The text of the announcement.
3614: # $client - Socket open on the client process.
3615: # Retunrns:
3616: # 1 - Indicating request processing should continue
3617: # Side Effects:
3618: # The file {DocRoot}/announcement.txt is created.
3619: # A reply is sent to $client.
3620: #
3621: sub set_announce_handler {
3622: my ($cmd, $announcement, $client) = @_;
3623:
3624: my $userinput = "$cmd:$announcement";
3625:
3626: chomp($announcement);
3627: $announcement=&unescape($announcement);
3628: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
3629: '/announcement.txt')) {
3630: print $store $announcement;
3631: close $store;
3632: &Reply($client, "ok\n", $userinput);
3633: } else {
3634: &Failure($client, "error: ".($!+0)."\n", $userinput);
3635: }
3636:
3637: return 1;
3638: }
3639: ®ister_handler("setannounce", \&set_announce_handler, 0, 1, 0);
3640:
3641: #
3642: # Return the version of the daemon. This can be used to determine
3643: # the compatibility of cross version installations or, alternatively to
3644: # simply know who's out of date and who isn't. Note that the version
3645: # is returned concatenated with the tail.
3646: # Parameters:
3647: # $cmd - the request that dispatched to us.
3648: # $tail - Tail of the request (client's version?).
3649: # $client - Socket open on the client.
3650: #Returns:
3651: # 1 - continue processing requests.
3652: # Side Effects:
3653: # Replies with version to $client.
3654: sub get_version_handler {
3655: my ($cmd, $tail, $client) = @_;
3656:
3657: my $userinput = $cmd.$tail;
3658:
3659: &Reply($client, &version($userinput)."\n", $userinput);
3660:
3661:
3662: return 1;
3663: }
3664: ®ister_handler("version", \&get_version_handler, 0, 1, 0);
3665:
3666: # Set the current host and domain. This is used to support
3667: # multihomed systems. Each IP of the system, or even separate daemons
3668: # on the same IP can be treated as handling a separate lonCAPA virtual
3669: # machine. This command selects the virtual lonCAPA. The client always
3670: # knows the right one since it is lonc and it is selecting the domain/system
3671: # from the hosts.tab file.
3672: # Parameters:
3673: # $cmd - Command that dispatched us.
3674: # $tail - Tail of the command (domain/host requested).
3675: # $socket - Socket open on the client.
3676: #
3677: # Returns:
3678: # 1 - Indicates the program should continue to process requests.
3679: # Side-effects:
3680: # The default domain/system context is modified for this daemon.
3681: # a reply is sent to the client.
3682: #
3683: sub set_virtual_host_handler {
3684: my ($cmd, $tail, $socket) = @_;
3685:
3686: my $userinput ="$cmd:$tail";
3687:
3688: &Reply($client, &sethost($userinput)."\n", $userinput);
3689:
3690:
3691: return 1;
3692: }
3693: ®ister_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
3694:
3695: # Process a request to exit:
3696: # - "bye" is sent to the client.
3697: # - The client socket is shutdown and closed.
3698: # - We indicate to the caller that we should exit.
3699: # Formal Parameters:
3700: # $cmd - The command that got us here.
3701: # $tail - Tail of the command (empty).
3702: # $client - Socket open on the tail.
3703: # Returns:
3704: # 0 - Indicating the program should exit!!
3705: #
3706: sub exit_handler {
3707: my ($cmd, $tail, $client) = @_;
3708:
3709: my $userinput = "$cmd:$tail";
3710:
3711: &logthis("Client $clientip ($clientname) hanging up: $userinput");
3712: &Reply($client, "bye\n", $userinput);
3713: $client->shutdown(2); # shutdown the socket forcibly.
3714: $client->close();
3715:
3716: return 0;
3717: }
3718: ®ister_handler("exit", \&exit_handler, 0,1,1);
3719: ®ister_handler("init", \&exit_handler, 0,1,1);
3720: ®ister_handler("quit", \&exit_handler, 0,1,1);
3721:
3722: # Determine if auto-enrollment is enabled.
3723: # Note that the original had what I believe to be a defect.
3724: # The original returned 0 if the requestor was not a registerd client.
3725: # It should return "refused".
3726: # Formal Parameters:
3727: # $cmd - The command that invoked us.
3728: # $tail - The tail of the command (Extra command parameters.
3729: # $client - The socket open on the client that issued the request.
3730: # Returns:
3731: # 1 - Indicating processing should continue.
3732: #
3733: sub enrollment_enabled_handler {
3734: my ($cmd, $tail, $client) = @_;
3735: my $userinput = $cmd.":".$tail; # For logging purposes.
3736:
3737:
3738: my $cdom = split(/:/, $tail); # Domain we're asking about.
3739: my $outcome = &localenroll::run($cdom);
3740: &Reply($client, "$outcome\n", $userinput);
3741:
3742: return 1;
3743: }
3744: ®ister_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
3745:
3746: # Get the official sections for which auto-enrollment is possible.
3747: # Since the admin people won't know about 'unofficial sections'
3748: # we cannot auto-enroll on them.
3749: # Formal Parameters:
3750: # $cmd - The command request that got us dispatched here.
3751: # $tail - The remainder of the request. In our case this
3752: # will be split into:
3753: # $coursecode - The course name from the admin point of view.
3754: # $cdom - The course's domain(?).
3755: # $client - Socket open on the client.
3756: # Returns:
3757: # 1 - Indiciting processing should continue.
3758: #
3759: sub get_sections_handler {
3760: my ($cmd, $tail, $client) = @_;
3761: my $userinput = "$cmd:$tail";
3762:
3763: my ($coursecode, $cdom) = split(/:/, $tail);
3764: my @secs = &localenroll::get_sections($coursecode,$cdom);
3765: my $seclist = &escape(join(':',@secs));
3766:
3767: &Reply($client, "$seclist\n", $userinput);
3768:
3769:
3770: return 1;
3771: }
3772: ®ister_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
3773:
3774: # Validate the owner of a new course section.
3775: #
3776: # Formal Parameters:
3777: # $cmd - Command that got us dispatched.
3778: # $tail - the remainder of the command. For us this consists of a
3779: # colon separated string containing:
3780: # $inst - Course Id from the institutions point of view.
3781: # $owner - Proposed owner of the course.
3782: # $cdom - Domain of the course (from the institutions
3783: # point of view?)..
3784: # $client - Socket open on the client.
3785: #
3786: # Returns:
3787: # 1 - Processing should continue.
3788: #
3789: sub validate_course_owner_handler {
3790: my ($cmd, $tail, $client) = @_;
3791: my $userinput = "$cmd:$tail";
3792: my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
3793:
3794: my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
3795: &Reply($client, "$outcome\n", $userinput);
3796:
3797:
3798:
3799: return 1;
3800: }
3801: ®ister_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
3802:
3803: #
3804: # Validate a course section in the official schedule of classes
3805: # from the institutions point of view (part of autoenrollment).
3806: #
3807: # Formal Parameters:
3808: # $cmd - The command request that got us dispatched.
3809: # $tail - The tail of the command. In this case,
3810: # this is a colon separated set of words that will be split
3811: # into:
3812: # $inst_course_id - The course/section id from the
3813: # institutions point of view.
3814: # $cdom - The domain from the institutions
3815: # point of view.
3816: # $client - Socket open on the client.
3817: # Returns:
3818: # 1 - Indicating processing should continue.
3819: #
3820: sub validate_course_section_handler {
3821: my ($cmd, $tail, $client) = @_;
3822: my $userinput = "$cmd:$tail";
3823: my ($inst_course_id, $cdom) = split(/:/, $tail);
3824:
3825: my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
3826: &Reply($client, "$outcome\n", $userinput);
3827:
3828:
3829: return 1;
3830: }
3831: ®ister_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
3832:
3833: #
3834: # Create a password for a new auto-enrollment user.
3835: # I think/guess, this password allows access to the institutions
3836: # AIS class list server/services. Stuart can correct this comment
3837: # when he finds out how wrong I am.
3838: #
3839: # Formal Parameters:
3840: # $cmd - The command request that got us dispatched.
3841: # $tail - The tail of the command. In this case this is a colon separated
3842: # set of words that will be split into:
3843: # $authparam - An authentication parameter (username??).
3844: # $cdom - The domain of the course from the institution's
3845: # point of view.
3846: # $client - The socket open on the client.
3847: # Returns:
3848: # 1 - continue processing.
3849: #
3850: sub create_auto_enroll_password_handler {
3851: my ($cmd, $tail, $client) = @_;
3852: my $userinput = "$cmd:$tail";
3853:
3854: my ($authparam, $cdom) = split(/:/, $userinput);
3855:
3856: my ($create_passwd,$authchk);
3857: ($authparam,
3858: $create_passwd,
3859: $authchk) = &localenroll::create_password($authparam,$cdom);
3860:
3861: &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
3862: $userinput);
3863:
3864:
3865: return 1;
3866: }
3867: ®ister_handler("autocreatepassword", \&create_auto_enroll_password_handler,
3868: 0, 1, 0);
3869:
3870: # Retrieve and remove temporary files created by/during autoenrollment.
3871: #
3872: # Formal Parameters:
3873: # $cmd - The command that got us dispatched.
3874: # $tail - The tail of the command. In our case this is a colon
3875: # separated list that will be split into:
3876: # $filename - The name of the file to remove.
3877: # The filename is given as a path relative to
3878: # the LonCAPA temp file directory.
3879: # $client - Socket open on the client.
3880: #
3881: # Returns:
3882: # 1 - Continue processing.
3883: sub retrieve_auto_file_handler {
3884: my ($cmd, $tail, $client) = @_;
3885: my $userinput = "cmd:$tail";
3886:
3887: my ($filename) = split(/:/, $tail);
3888:
3889: my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
3890: if ( (-e $source) && ($filename ne '') ) {
3891: my $reply = '';
3892: if (open(my $fh,$source)) {
3893: while (<$fh>) {
3894: chomp($_);
3895: $_ =~ s/^\s+//g;
3896: $_ =~ s/\s+$//g;
3897: $reply .= $_;
3898: }
3899: close($fh);
3900: &Reply($client, &escape($reply)."\n", $userinput);
3901:
3902: # Does this have to be uncommented??!? (RF).
3903: #
3904: # unlink($source);
3905: } else {
3906: &Failure($client, "error\n", $userinput);
3907: }
3908: } else {
3909: &Failure($client, "error\n", $userinput);
3910: }
3911:
3912:
3913: return 1;
3914: }
3915: ®ister_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
3916:
3917: #
3918: # Read and retrieve institutional code format (for support form).
3919: # Formal Parameters:
3920: # $cmd - Command that dispatched us.
3921: # $tail - Tail of the command. In this case it conatins
3922: # the course domain and the coursename.
3923: # $client - Socket open on the client.
3924: # Returns:
3925: # 1 - Continue processing.
3926: #
3927: sub get_institutional_code_format_handler {
3928: my ($cmd, $tail, $client) = @_;
3929: my $userinput = "$cmd:$tail";
3930:
3931: my $reply;
3932: my($cdom,$course) = split(/:/,$tail);
3933: my @pairs = split/\&/,$course;
3934: my %instcodes = ();
3935: my %codes = ();
3936: my @codetitles = ();
3937: my %cat_titles = ();
3938: my %cat_order = ();
3939: foreach (@pairs) {
3940: my ($key,$value) = split/=/,$_;
3941: $instcodes{&unescape($key)} = &unescape($value);
3942: }
3943: my $formatreply = &localenroll::instcode_format($cdom,
3944: \%instcodes,
3945: \%codes,
3946: \@codetitles,
3947: \%cat_titles,
3948: \%cat_order);
3949: if ($formatreply eq 'ok') {
3950: my $codes_str = &hash2str(%codes);
3951: my $codetitles_str = &array2str(@codetitles);
3952: my $cat_titles_str = &hash2str(%cat_titles);
3953: my $cat_order_str = &hash2str(%cat_order);
3954: &Reply($client,
3955: $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
3956: .$cat_order_str."\n",
3957: $userinput);
3958: } else {
3959: # this else branch added by RF since if not ok, lonc will
3960: # hang waiting on reply until timeout.
3961: #
3962: &Reply($client, "format_error\n", $userinput);
3963: }
3964:
3965: return 1;
3966: }
3967: ®ister_handler("autoinstcodeformat",
3968: \&get_institutional_code_format_handler,0,1,0);
3969:
3970: #
3971: # Gets a student's photo to exist (in the correct image type) in the user's
3972: # directory.
3973: # Formal Parameters:
3974: # $cmd - The command request that got us dispatched.
3975: # $tail - A colon separated set of words that will be split into:
3976: # $domain - student's domain
3977: # $uname - student username
3978: # $type - image type desired
3979: # $client - The socket open on the client.
3980: # Returns:
3981: # 1 - continue processing.
3982: sub student_photo_handler {
3983: my ($cmd, $tail, $client) = @_;
3984: my ($domain,$uname,$type) = split(/:/, $tail);
3985:
3986: my $path=&propath($domain,$uname).
3987: '/userfiles/internal/studentphoto.'.$type;
3988: if (-e $path) {
3989: &Reply($client,"ok\n","$cmd:$tail");
3990: return 1;
3991: }
3992: &mkpath($path);
3993: my $file=&localstudentphoto::fetch($domain,$uname);
3994: if (!$file) {
3995: &Failure($client,"unavailable\n","$cmd:$tail");
3996: return 1;
3997: }
3998: if (!-e $path) { &convert_photo($file,$path); }
3999: if (-e $path) {
4000: &Reply($client,"ok\n","$cmd:$tail");
4001: return 1;
4002: }
4003: &Failure($client,"unable_to_convert\n","$cmd:$tail");
4004: return 1;
4005: }
4006: ®ister_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
4007:
4008: # mkpath makes all directories for a file, expects an absolute path with a
4009: # file or a trailing / if just a dir is passed
4010: # returns 1 on success 0 on failure
4011: sub mkpath {
4012: my ($file)=@_;
4013: my @parts=split(/\//,$file,-1);
4014: my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
4015: for (my $i=3;$i<= ($#parts-1);$i++) {
4016: $now.='/'.$parts[$i];
4017: if (!-e $now) {
4018: if (!mkdir($now,0770)) { return 0; }
4019: }
4020: }
4021: return 1;
4022: }
4023:
4024: #---------------------------------------------------------------
4025: #
4026: # Getting, decoding and dispatching requests:
4027: #
4028: #
4029: # Get a Request:
4030: # Gets a Request message from the client. The transaction
4031: # is defined as a 'line' of text. We remove the new line
4032: # from the text line.
4033: #
4034: sub get_request {
4035: my $input = <$client>;
4036: chomp($input);
4037:
4038: &Debug("get_request: Request = $input\n");
4039:
4040: &status('Processing '.$clientname.':'.$input);
4041:
4042: return $input;
4043: }
4044: #---------------------------------------------------------------
4045: #
4046: # Process a request. This sub should shrink as each action
4047: # gets farmed out into a separat sub that is registered
4048: # with the dispatch hash.
4049: #
4050: # Parameters:
4051: # user_input - The request received from the client (lonc).
4052: # Returns:
4053: # true to keep processing, false if caller should exit.
4054: #
4055: sub process_request {
4056: my ($userinput) = @_; # Easier for now to break style than to
4057: # fix all the userinput -> user_input.
4058: my $wasenc = 0; # True if request was encrypted.
4059: # ------------------------------------------------------------ See if encrypted
4060: if ($userinput =~ /^enc/) {
4061: $userinput = decipher($userinput);
4062: $wasenc=1;
4063: if(!$userinput) { # Cipher not defined.
4064: &Failure($client, "error: Encrypted data without negotated key\n");
4065: return 0;
4066: }
4067: }
4068: Debug("process_request: $userinput\n");
4069:
4070: #
4071: # The 'correct way' to add a command to lond is now to
4072: # write a sub to execute it and Add it to the command dispatch
4073: # hash via a call to register_handler.. The comments to that
4074: # sub should give you enough to go on to show how to do this
4075: # along with the examples that are building up as this code
4076: # is getting refactored. Until all branches of the
4077: # if/elseif monster below have been factored out into
4078: # separate procesor subs, if the dispatch hash is missing
4079: # the command keyword, we will fall through to the remainder
4080: # of the if/else chain below in order to keep this thing in
4081: # working order throughout the transmogrification.
4082:
4083: my ($command, $tail) = split(/:/, $userinput, 2);
4084: chomp($command);
4085: chomp($tail);
4086: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
4087: $command =~ s/(\r)//; # And this too for parameterless commands.
4088: if(!$tail) {
4089: $tail =""; # defined but blank.
4090: }
4091:
4092: &Debug("Command received: $command, encoded = $wasenc");
4093:
4094: if(defined $Dispatcher{$command}) {
4095:
4096: my $dispatch_info = $Dispatcher{$command};
4097: my $handler = $$dispatch_info[0];
4098: my $need_encode = $$dispatch_info[1];
4099: my $client_types = $$dispatch_info[2];
4100: Debug("Matched dispatch hash: mustencode: $need_encode "
4101: ."ClientType $client_types");
4102:
4103: # Validate the request:
4104:
4105: my $ok = 1;
4106: my $requesterprivs = 0;
4107: if(&isClient()) {
4108: $requesterprivs |= $CLIENT_OK;
4109: }
4110: if(&isManager()) {
4111: $requesterprivs |= $MANAGER_OK;
4112: }
4113: if($need_encode && (!$wasenc)) {
4114: Debug("Must encode but wasn't: $need_encode $wasenc");
4115: $ok = 0;
4116: }
4117: if(($client_types & $requesterprivs) == 0) {
4118: Debug("Client not privileged to do this operation");
4119: $ok = 0;
4120: }
4121:
4122: if($ok) {
4123: Debug("Dispatching to handler $command $tail");
4124: my $keep_going = &$handler($command, $tail, $client);
4125: return $keep_going;
4126: } else {
4127: Debug("Refusing to dispatch because client did not match requirements");
4128: Failure($client, "refused\n", $userinput);
4129: return 1;
4130: }
4131:
4132: }
4133:
4134: print $client "unknown_cmd\n";
4135: # -------------------------------------------------------------------- complete
4136: Debug("process_request - returning 1");
4137: return 1;
4138: }
4139: #
4140: # Decipher encoded traffic
4141: # Parameters:
4142: # input - Encoded data.
4143: # Returns:
4144: # Decoded data or undef if encryption key was not yet negotiated.
4145: # Implicit input:
4146: # cipher - This global holds the negotiated encryption key.
4147: #
4148: sub decipher {
4149: my ($input) = @_;
4150: my $output = '';
4151:
4152:
4153: if($cipher) {
4154: my($enc, $enclength, $encinput) = split(/:/, $input);
4155: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
4156: $output .=
4157: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
4158: }
4159: return substr($output, 0, $enclength);
4160: } else {
4161: return undef;
4162: }
4163: }
4164:
4165: #
4166: # Register a command processor. This function is invoked to register a sub
4167: # to process a request. Once registered, the ProcessRequest sub can automatically
4168: # dispatch requests to an appropriate sub, and do the top level validity checking
4169: # as well:
4170: # - Is the keyword recognized.
4171: # - Is the proper client type attempting the request.
4172: # - Is the request encrypted if it has to be.
4173: # Parameters:
4174: # $request_name - Name of the request being registered.
4175: # This is the command request that will match
4176: # against the hash keywords to lookup the information
4177: # associated with the dispatch information.
4178: # $procedure - Reference to a sub to call to process the request.
4179: # All subs get called as follows:
4180: # Procedure($cmd, $tail, $replyfd, $key)
4181: # $cmd - the actual keyword that invoked us.
4182: # $tail - the tail of the request that invoked us.
4183: # $replyfd- File descriptor connected to the client
4184: # $must_encode - True if the request must be encoded to be good.
4185: # $client_ok - True if it's ok for a client to request this.
4186: # $manager_ok - True if it's ok for a manager to request this.
4187: # Side effects:
4188: # - On success, the Dispatcher hash has an entry added for the key $RequestName
4189: # - On failure, the program will die as it's a bad internal bug to try to
4190: # register a duplicate command handler.
4191: #
4192: sub register_handler {
4193: my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_;
4194:
4195: # Don't allow duplication#
4196:
4197: if (defined $Dispatcher{$request_name}) {
4198: die "Attempting to define a duplicate request handler for $request_name\n";
4199: }
4200: # Build the client type mask:
4201:
4202: my $client_type_mask = 0;
4203: if($client_ok) {
4204: $client_type_mask |= $CLIENT_OK;
4205: }
4206: if($manager_ok) {
4207: $client_type_mask |= $MANAGER_OK;
4208: }
4209:
4210: # Enter the hash:
4211:
4212: my @entry = ($procedure, $must_encode, $client_type_mask);
4213:
4214: $Dispatcher{$request_name} = \@entry;
4215:
4216: }
4217:
4218:
4219: #------------------------------------------------------------------
4220:
4221:
4222:
4223:
4224: #
4225: # Convert an error return code from lcpasswd to a string value.
4226: #
4227: sub lcpasswdstrerror {
4228: my $ErrorCode = shift;
4229: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
4230: return "lcpasswd Unrecognized error return value ".$ErrorCode;
4231: } else {
4232: return $passwderrors[$ErrorCode];
4233: }
4234: }
4235:
4236: #
4237: # Convert an error return code from lcuseradd to a string value:
4238: #
4239: sub lcuseraddstrerror {
4240: my $ErrorCode = shift;
4241: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
4242: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
4243: } else {
4244: return $adderrors[$ErrorCode];
4245: }
4246: }
4247:
4248: # grabs exception and records it to log before exiting
4249: sub catchexception {
4250: my ($error)=@_;
4251: $SIG{'QUIT'}='DEFAULT';
4252: $SIG{__DIE__}='DEFAULT';
4253: &status("Catching exception");
4254: &logthis("<font color='red'>CRITICAL: "
4255: ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
4256: ."a crash with this error msg->[$error]</font>");
4257: &logthis('Famous last words: '.$status.' - '.$lastlog);
4258: if ($client) { print $client "error: $error\n"; }
4259: $server->close();
4260: die($error);
4261: }
4262: sub timeout {
4263: &status("Handling Timeout");
4264: &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
4265: &catchexception('Timeout');
4266: }
4267: # -------------------------------- Set signal handlers to record abnormal exits
4268:
4269:
4270: $SIG{'QUIT'}=\&catchexception;
4271: $SIG{__DIE__}=\&catchexception;
4272:
4273: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
4274: &status("Read loncapa.conf and loncapa_apache.conf");
4275: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
4276: %perlvar=%{$perlvarref};
4277: undef $perlvarref;
4278:
4279: # ----------------------------- Make sure this process is running from user=www
4280: my $wwwid=getpwnam('www');
4281: if ($wwwid!=$<) {
4282: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
4283: my $subj="LON: $currenthostid User ID mismatch";
4284: system("echo 'User ID mismatch. lond must be run as user www.' |\
4285: mailto $emailto -s '$subj' > /dev/null");
4286: exit 1;
4287: }
4288:
4289: # --------------------------------------------- Check if other instance running
4290:
4291: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
4292:
4293: if (-e $pidfile) {
4294: my $lfh=IO::File->new("$pidfile");
4295: my $pide=<$lfh>;
4296: chomp($pide);
4297: if (kill 0 => $pide) { die "already running"; }
4298: }
4299:
4300: # ------------------------------------------------------------- Read hosts file
4301:
4302:
4303:
4304: # establish SERVER socket, bind and listen.
4305: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
4306: Type => SOCK_STREAM,
4307: Proto => 'tcp',
4308: Reuse => 1,
4309: Listen => 10 )
4310: or die "making socket: $@\n";
4311:
4312: # --------------------------------------------------------- Do global variables
4313:
4314: # global variables
4315:
4316: my %children = (); # keys are current child process IDs
4317:
4318: sub REAPER { # takes care of dead children
4319: $SIG{CHLD} = \&REAPER;
4320: &status("Handling child death");
4321: my $pid;
4322: do {
4323: $pid = waitpid(-1,&WNOHANG());
4324: if (defined($children{$pid})) {
4325: &logthis("Child $pid died");
4326: delete($children{$pid});
4327: } elsif ($pid > 0) {
4328: &logthis("Unknown Child $pid died");
4329: }
4330: } while ( $pid > 0 );
4331: foreach my $child (keys(%children)) {
4332: $pid = waitpid($child,&WNOHANG());
4333: if ($pid > 0) {
4334: &logthis("Child $child - $pid looks like we missed it's death");
4335: delete($children{$pid});
4336: }
4337: }
4338: &status("Finished Handling child death");
4339: }
4340:
4341: sub HUNTSMAN { # signal handler for SIGINT
4342: &status("Killing children (INT)");
4343: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
4344: kill 'INT' => keys %children;
4345: &logthis("Free socket: ".shutdown($server,2)); # free up socket
4346: my $execdir=$perlvar{'lonDaemons'};
4347: unlink("$execdir/logs/lond.pid");
4348: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
4349: &status("Done killing children");
4350: exit; # clean up with dignity
4351: }
4352:
4353: sub HUPSMAN { # signal handler for SIGHUP
4354: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
4355: &status("Killing children for restart (HUP)");
4356: kill 'INT' => keys %children;
4357: &logthis("Free socket: ".shutdown($server,2)); # free up socket
4358: &logthis("<font color='red'>CRITICAL: Restarting</font>");
4359: my $execdir=$perlvar{'lonDaemons'};
4360: unlink("$execdir/logs/lond.pid");
4361: &status("Restarting self (HUP)");
4362: exec("$execdir/lond"); # here we go again
4363: }
4364:
4365: #
4366: # Kill off hashes that describe the host table prior to re-reading it.
4367: # Hashes affected are:
4368: # %hostid, %hostdom %hostip %hostdns.
4369: #
4370: sub KillHostHashes {
4371: foreach my $key (keys %hostid) {
4372: delete $hostid{$key};
4373: }
4374: foreach my $key (keys %hostdom) {
4375: delete $hostdom{$key};
4376: }
4377: foreach my $key (keys %hostip) {
4378: delete $hostip{$key};
4379: }
4380: foreach my $key (keys %hostdns) {
4381: delete $hostdns{$key};
4382: }
4383: }
4384: #
4385: # Read in the host table from file and distribute it into the various hashes:
4386: #
4387: # - %hostid - Indexed by IP, the loncapa hostname.
4388: # - %hostdom - Indexed by loncapa hostname, the domain.
4389: # - %hostip - Indexed by hostid, the Ip address of the host.
4390: sub ReadHostTable {
4391:
4392: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
4393: my $myloncapaname = $perlvar{'lonHostID'};
4394: Debug("My loncapa name is : $myloncapaname");
4395: while (my $configline=<CONFIG>) {
4396: if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {
4397: my ($id,$domain,$role,$name)=split(/:/,$configline);
4398: $name=~s/\s//g;
4399: my $ip = gethostbyname($name);
4400: if (length($ip) ne 4) {
4401: &logthis("Skipping host $id name $name no IP $ip found\n");
4402: next;
4403: }
4404: $ip=inet_ntoa($ip);
4405: $hostid{$ip}=$id; # LonCAPA name of host by IP.
4406: $hostdom{$id}=$domain; # LonCAPA domain name of host.
4407: $hostip{$id}=$ip; # IP address of host.
4408: $hostdns{$name} = $id; # LonCAPA name of host by DNS.
4409:
4410: if ($id eq $perlvar{'lonHostID'}) {
4411: Debug("Found me in the host table: $name");
4412: $thisserver=$name;
4413: }
4414: }
4415: }
4416: close(CONFIG);
4417: }
4418: #
4419: # Reload the Apache daemon's state.
4420: # This is done by invoking /home/httpd/perl/apachereload
4421: # a setuid perl script that can be root for us to do this job.
4422: #
4423: sub ReloadApache {
4424: my $execdir = $perlvar{'lonDaemons'};
4425: my $script = $execdir."/apachereload";
4426: system($script);
4427: }
4428:
4429: #
4430: # Called in response to a USR2 signal.
4431: # - Reread hosts.tab
4432: # - All children connected to hosts that were removed from hosts.tab
4433: # are killed via SIGINT
4434: # - All children connected to previously existing hosts are sent SIGUSR1
4435: # - Our internal hosts hash is updated to reflect the new contents of
4436: # hosts.tab causing connections from hosts added to hosts.tab to
4437: # now be honored.
4438: #
4439: sub UpdateHosts {
4440: &status("Reload hosts.tab");
4441: logthis('<font color="blue"> Updating connections </font>');
4442: #
4443: # The %children hash has the set of IP's we currently have children
4444: # on. These need to be matched against records in the hosts.tab
4445: # Any ip's no longer in the table get killed off they correspond to
4446: # either dropped or changed hosts. Note that the re-read of the table
4447: # will take care of new and changed hosts as connections come into being.
4448:
4449:
4450: KillHostHashes;
4451: ReadHostTable;
4452:
4453: foreach my $child (keys %children) {
4454: my $childip = $children{$child};
4455: if(!$hostid{$childip}) {
4456: logthis('<font color="blue"> UpdateHosts killing child '
4457: ." $child for ip $childip </font>");
4458: kill('INT', $child);
4459: } else {
4460: logthis('<font color="green"> keeping child for ip '
4461: ." $childip (pid=$child) </font>");
4462: }
4463: }
4464: ReloadApache;
4465: &status("Finished reloading hosts.tab");
4466: }
4467:
4468:
4469: sub checkchildren {
4470: &status("Checking on the children (sending signals)");
4471: &initnewstatus();
4472: &logstatus();
4473: &logthis('Going to check on the children');
4474: my $docdir=$perlvar{'lonDocRoot'};
4475: foreach (sort keys %children) {
4476: #sleep 1;
4477: unless (kill 'USR1' => $_) {
4478: &logthis ('Child '.$_.' is dead');
4479: &logstatus($$.' is dead');
4480: delete($children{$_});
4481: }
4482: }
4483: sleep 5;
4484: $SIG{ALRM} = sub { Debug("timeout");
4485: die "timeout"; };
4486: $SIG{__DIE__} = 'DEFAULT';
4487: &status("Checking on the children (waiting for reports)");
4488: foreach (sort keys %children) {
4489: unless (-e "$docdir/lon-status/londchld/$_.txt") {
4490: eval {
4491: alarm(300);
4492: &logthis('Child '.$_.' did not respond');
4493: kill 9 => $_;
4494: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
4495: #$subj="LON: $currenthostid killed lond process $_";
4496: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
4497: #$execdir=$perlvar{'lonDaemons'};
4498: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
4499: delete($children{$_});
4500: alarm(0);
4501: }
4502: }
4503: }
4504: $SIG{ALRM} = 'DEFAULT';
4505: $SIG{__DIE__} = \&catchexception;
4506: &status("Finished checking children");
4507: &logthis('Finished Checking children');
4508: }
4509:
4510: # --------------------------------------------------------------------- Logging
4511:
4512: sub logthis {
4513: my $message=shift;
4514: my $execdir=$perlvar{'lonDaemons'};
4515: my $fh=IO::File->new(">>$execdir/logs/lond.log");
4516: my $now=time;
4517: my $local=localtime($now);
4518: $lastlog=$local.': '.$message;
4519: print $fh "$local ($$): $message\n";
4520: }
4521:
4522: # ------------------------- Conditional log if $DEBUG true.
4523: sub Debug {
4524: my $message = shift;
4525: if($DEBUG) {
4526: &logthis($message);
4527: }
4528: }
4529:
4530: #
4531: # Sub to do replies to client.. this gives a hook for some
4532: # debug tracing too:
4533: # Parameters:
4534: # fd - File open on client.
4535: # reply - Text to send to client.
4536: # request - Original request from client.
4537: #
4538: sub Reply {
4539: my ($fd, $reply, $request) = @_;
4540: print $fd $reply;
4541: Debug("Request was $request Reply was $reply");
4542:
4543: $Transactions++;
4544: }
4545:
4546:
4547: #
4548: # Sub to report a failure.
4549: # This function:
4550: # - Increments the failure statistic counters.
4551: # - Invokes Reply to send the error message to the client.
4552: # Parameters:
4553: # fd - File descriptor open on the client
4554: # reply - Reply text to emit.
4555: # request - The original request message (used by Reply
4556: # to debug if that's enabled.
4557: # Implicit outputs:
4558: # $Failures- The number of failures is incremented.
4559: # Reply (invoked here) sends a message to the
4560: # client:
4561: #
4562: sub Failure {
4563: my $fd = shift;
4564: my $reply = shift;
4565: my $request = shift;
4566:
4567: $Failures++;
4568: Reply($fd, $reply, $request); # That's simple eh?
4569: }
4570: # ------------------------------------------------------------------ Log status
4571:
4572: sub logstatus {
4573: &status("Doing logging");
4574: my $docdir=$perlvar{'lonDocRoot'};
4575: {
4576: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
4577: print $fh $status."\n".$lastlog."\n".time."\n$keymode";
4578: $fh->close();
4579: }
4580: &status("Finished $$.txt");
4581: {
4582: open(LOG,">>$docdir/lon-status/londstatus.txt");
4583: flock(LOG,LOCK_EX);
4584: print LOG $$."\t".$clientname."\t".$currenthostid."\t"
4585: .$status."\t".$lastlog."\t $keymode\n";
4586: flock(LOG,LOCK_UN);
4587: close(LOG);
4588: }
4589: &status("Finished logging");
4590: }
4591:
4592: sub initnewstatus {
4593: my $docdir=$perlvar{'lonDocRoot'};
4594: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
4595: my $now=time;
4596: my $local=localtime($now);
4597: print $fh "LOND status $local - parent $$\n\n";
4598: opendir(DIR,"$docdir/lon-status/londchld");
4599: while (my $filename=readdir(DIR)) {
4600: unlink("$docdir/lon-status/londchld/$filename");
4601: }
4602: closedir(DIR);
4603: }
4604:
4605: # -------------------------------------------------------------- Status setting
4606:
4607: sub status {
4608: my $what=shift;
4609: my $now=time;
4610: my $local=localtime($now);
4611: $status=$local.': '.$what;
4612: $0='lond: '.$what.' '.$local;
4613: }
4614:
4615: # -------------------------------------------------------- Escape Special Chars
4616:
4617: sub escape {
4618: my $str=shift;
4619: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
4620: return $str;
4621: }
4622:
4623: # ----------------------------------------------------- Un-Escape Special Chars
4624:
4625: sub unescape {
4626: my $str=shift;
4627: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
4628: return $str;
4629: }
4630:
4631: # ----------------------------------------------------------- Send USR1 to lonc
4632:
4633: sub reconlonc {
4634: my $peerfile=shift;
4635: &logthis("Trying to reconnect for $peerfile");
4636: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
4637: if (my $fh=IO::File->new("$loncfile")) {
4638: my $loncpid=<$fh>;
4639: chomp($loncpid);
4640: if (kill 0 => $loncpid) {
4641: &logthis("lonc at pid $loncpid responding, sending USR1");
4642: kill USR1 => $loncpid;
4643: } else {
4644: &logthis(
4645: "<font color='red'>CRITICAL: "
4646: ."lonc at pid $loncpid not responding, giving up</font>");
4647: }
4648: } else {
4649: &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
4650: }
4651: }
4652:
4653: # -------------------------------------------------- Non-critical communication
4654:
4655: sub subreply {
4656: my ($cmd,$server)=@_;
4657: my $peerfile="$perlvar{'lonSockDir'}/$server";
4658: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
4659: Type => SOCK_STREAM,
4660: Timeout => 10)
4661: or return "con_lost";
4662: print $sclient "$cmd\n";
4663: my $answer=<$sclient>;
4664: chomp($answer);
4665: if (!$answer) { $answer="con_lost"; }
4666: return $answer;
4667: }
4668:
4669: sub reply {
4670: my ($cmd,$server)=@_;
4671: my $answer;
4672: if ($server ne $currenthostid) {
4673: $answer=subreply($cmd,$server);
4674: if ($answer eq 'con_lost') {
4675: $answer=subreply("ping",$server);
4676: if ($answer ne $server) {
4677: &logthis("sub reply: answer != server answer is $answer, server is $server");
4678: &reconlonc("$perlvar{'lonSockDir'}/$server");
4679: }
4680: $answer=subreply($cmd,$server);
4681: }
4682: } else {
4683: $answer='self_reply';
4684: }
4685: return $answer;
4686: }
4687:
4688: # -------------------------------------------------------------- Talk to lonsql
4689:
4690: sub sql_reply {
4691: my ($cmd)=@_;
4692: my $answer=&sub_sql_reply($cmd);
4693: if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
4694: return $answer;
4695: }
4696:
4697: sub sub_sql_reply {
4698: my ($cmd)=@_;
4699: my $unixsock="mysqlsock";
4700: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
4701: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
4702: Type => SOCK_STREAM,
4703: Timeout => 10)
4704: or return "con_lost";
4705: print $sclient "$cmd\n";
4706: my $answer=<$sclient>;
4707: chomp($answer);
4708: if (!$answer) { $answer="con_lost"; }
4709: return $answer;
4710: }
4711:
4712: # -------------------------------------------- Return path to profile directory
4713:
4714: sub propath {
4715: my ($udom,$uname)=@_;
4716: $udom=~s/\W//g;
4717: $uname=~s/\W//g;
4718: my $subdir=$uname.'__';
4719: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
4720: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
4721: return $proname;
4722: }
4723:
4724: # --------------------------------------- Is this the home server of an author?
4725:
4726: sub ishome {
4727: my $author=shift;
4728: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
4729: my ($udom,$uname)=split(/\//,$author);
4730: my $proname=propath($udom,$uname);
4731: if (-e $proname) {
4732: return 'owner';
4733: } else {
4734: return 'not_owner';
4735: }
4736: }
4737:
4738: # ======================================================= Continue main program
4739: # ---------------------------------------------------- Fork once and dissociate
4740:
4741: my $fpid=fork;
4742: exit if $fpid;
4743: die "Couldn't fork: $!" unless defined ($fpid);
4744:
4745: POSIX::setsid() or die "Can't start new session: $!";
4746:
4747: # ------------------------------------------------------- Write our PID on disk
4748:
4749: my $execdir=$perlvar{'lonDaemons'};
4750: open (PIDSAVE,">$execdir/logs/lond.pid");
4751: print PIDSAVE "$$\n";
4752: close(PIDSAVE);
4753: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
4754: &status('Starting');
4755:
4756:
4757:
4758: # ----------------------------------------------------- Install signal handlers
4759:
4760:
4761: $SIG{CHLD} = \&REAPER;
4762: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
4763: $SIG{HUP} = \&HUPSMAN;
4764: $SIG{USR1} = \&checkchildren;
4765: $SIG{USR2} = \&UpdateHosts;
4766:
4767: # Read the host hashes:
4768:
4769: ReadHostTable;
4770:
4771: my $dist=`$perlvar{'lonDaemons'}/distprobe`;
4772:
4773: # --------------------------------------------------------------
4774: # Accept connections. When a connection comes in, it is validated
4775: # and if good, a child process is created to process transactions
4776: # along the connection.
4777:
4778: while (1) {
4779: &status('Starting accept');
4780: $client = $server->accept() or next;
4781: &status('Accepted '.$client.' off to spawn');
4782: make_new_child($client);
4783: &status('Finished spawning');
4784: }
4785:
4786: sub make_new_child {
4787: my $pid;
4788: # my $cipher; # Now global
4789: my $sigset;
4790:
4791: $client = shift;
4792: &status('Starting new child '.$client);
4793: &logthis('<font color="green"> Attempting to start child ('.$client.
4794: ")</font>");
4795: # block signal for fork
4796: $sigset = POSIX::SigSet->new(SIGINT);
4797: sigprocmask(SIG_BLOCK, $sigset)
4798: or die "Can't block SIGINT for fork: $!\n";
4799:
4800: die "fork: $!" unless defined ($pid = fork);
4801:
4802: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
4803: # connection liveness.
4804:
4805: #
4806: # Figure out who we're talking to so we can record the peer in
4807: # the pid hash.
4808: #
4809: my $caller = getpeername($client);
4810: my ($port,$iaddr);
4811: if (defined($caller) && length($caller) > 0) {
4812: ($port,$iaddr)=unpack_sockaddr_in($caller);
4813: } else {
4814: &logthis("Unable to determine who caller was, getpeername returned nothing");
4815: }
4816: if (defined($iaddr)) {
4817: $clientip = inet_ntoa($iaddr);
4818: Debug("Connected with $clientip");
4819: } else {
4820: &logthis("Unable to determine clientip");
4821: $clientip='Unavailable';
4822: }
4823:
4824: if ($pid) {
4825: # Parent records the child's birth and returns.
4826: sigprocmask(SIG_UNBLOCK, $sigset)
4827: or die "Can't unblock SIGINT for fork: $!\n";
4828: $children{$pid} = $clientip;
4829: &status('Started child '.$pid);
4830: return;
4831: } else {
4832: # Child can *not* return from this subroutine.
4833: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
4834: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
4835: #don't get intercepted
4836: $SIG{USR1}= \&logstatus;
4837: $SIG{ALRM}= \&timeout;
4838: $lastlog='Forked ';
4839: $status='Forked';
4840:
4841: # unblock signals
4842: sigprocmask(SIG_UNBLOCK, $sigset)
4843: or die "Can't unblock SIGINT for fork: $!\n";
4844:
4845: # my $tmpsnum=0; # Now global
4846: #---------------------------------------------------- kerberos 5 initialization
4847: &Authen::Krb5::init_context();
4848: if ($dist ne 'fedora4') {
4849: &Authen::Krb5::init_ets();
4850: }
4851:
4852: &status('Accepted connection');
4853: # =============================================================================
4854: # do something with the connection
4855: # -----------------------------------------------------------------------------
4856: # see if we know client and 'check' for spoof IP by ineffective challenge
4857:
4858: ReadManagerTable; # May also be a manager!!
4859:
4860: my $outsideip=$clientip;
4861: if ($clientip eq '127.0.0.1') {
4862: $outsideip=$hostip{$perlvar{'lonHostID'}};
4863: }
4864:
4865: my $clientrec=($hostid{$outsideip} ne undef);
4866: my $ismanager=($managers{$outsideip} ne undef);
4867: $clientname = "[unknonwn]";
4868: if($clientrec) { # Establish client type.
4869: $ConnectionType = "client";
4870: $clientname = $hostid{$outsideip};
4871: if($ismanager) {
4872: $ConnectionType = "both";
4873: }
4874: } else {
4875: $ConnectionType = "manager";
4876: $clientname = $managers{$outsideip};
4877: }
4878: my $clientok;
4879:
4880: if ($clientrec || $ismanager) {
4881: &status("Waiting for init from $clientip $clientname");
4882: &logthis('<font color="yellow">INFO: Connection, '.
4883: $clientip.
4884: " ($clientname) connection type = $ConnectionType </font>" );
4885: &status("Connecting $clientip ($clientname))");
4886: my $remotereq=<$client>;
4887: chomp($remotereq);
4888: Debug("Got init: $remotereq");
4889: my $inikeyword = split(/:/, $remotereq);
4890: if ($remotereq =~ /^init/) {
4891: &sethost("sethost:$perlvar{'lonHostID'}");
4892: #
4893: # If the remote is attempting a local init... give that a try:
4894: #
4895: my ($i, $inittype) = split(/:/, $remotereq);
4896:
4897: # If the connection type is ssl, but I didn't get my
4898: # certificate files yet, then I'll drop back to
4899: # insecure (if allowed).
4900:
4901: if($inittype eq "ssl") {
4902: my ($ca, $cert) = lonssl::CertificateFile;
4903: my $kfile = lonssl::KeyFile;
4904: if((!$ca) ||
4905: (!$cert) ||
4906: (!$kfile)) {
4907: $inittype = ""; # This forces insecure attempt.
4908: &logthis("<font color=\"blue\"> Certificates not "
4909: ."installed -- trying insecure auth</font>");
4910: } else { # SSL certificates are in place so
4911: } # Leave the inittype alone.
4912: }
4913:
4914: if($inittype eq "local") {
4915: my $key = LocalConnection($client, $remotereq);
4916: if($key) {
4917: Debug("Got local key $key");
4918: $clientok = 1;
4919: my $cipherkey = pack("H32", $key);
4920: $cipher = new IDEA($cipherkey);
4921: print $client "ok:local\n";
4922: &logthis('<font color="green"'
4923: . "Successful local authentication </font>");
4924: $keymode = "local"
4925: } else {
4926: Debug("Failed to get local key");
4927: $clientok = 0;
4928: shutdown($client, 3);
4929: close $client;
4930: }
4931: } elsif ($inittype eq "ssl") {
4932: my $key = SSLConnection($client);
4933: if ($key) {
4934: $clientok = 1;
4935: my $cipherkey = pack("H32", $key);
4936: $cipher = new IDEA($cipherkey);
4937: &logthis('<font color="green">'
4938: ."Successfull ssl authentication with $clientname </font>");
4939: $keymode = "ssl";
4940:
4941: } else {
4942: $clientok = 0;
4943: close $client;
4944: }
4945:
4946: } else {
4947: my $ok = InsecureConnection($client);
4948: if($ok) {
4949: $clientok = 1;
4950: &logthis('<font color="green">'
4951: ."Successful insecure authentication with $clientname </font>");
4952: print $client "ok\n";
4953: $keymode = "insecure";
4954: } else {
4955: &logthis('<font color="yellow">'
4956: ."Attempted insecure connection disallowed </font>");
4957: close $client;
4958: $clientok = 0;
4959:
4960: }
4961: }
4962: } else {
4963: &logthis(
4964: "<font color='blue'>WARNING: "
4965: ."$clientip failed to initialize: >$remotereq< </font>");
4966: &status('No init '.$clientip);
4967: }
4968:
4969: } else {
4970: &logthis(
4971: "<font color='blue'>WARNING: Unknown client $clientip</font>");
4972: &status('Hung up on '.$clientip);
4973: }
4974:
4975: if ($clientok) {
4976: # ---------------- New known client connecting, could mean machine online again
4977:
4978: foreach my $id (keys(%hostip)) {
4979: if ($hostip{$id} ne $clientip ||
4980: $hostip{$currenthostid} eq $clientip) {
4981: # no need to try to do recon's to myself
4982: next;
4983: }
4984: &reconlonc("$perlvar{'lonSockDir'}/$id");
4985: }
4986: &logthis("<font color='green'>Established connection: $clientname</font>");
4987: &status('Will listen to '.$clientname);
4988: # ------------------------------------------------------------ Process requests
4989: my $keep_going = 1;
4990: my $user_input;
4991: while(($user_input = get_request) && $keep_going) {
4992: alarm(120);
4993: Debug("Main: Got $user_input\n");
4994: $keep_going = &process_request($user_input);
4995: alarm(0);
4996: &status('Listening to '.$clientname." ($keymode)");
4997: }
4998:
4999: # --------------------------------------------- client unknown or fishy, refuse
5000: } else {
5001: print $client "refused\n";
5002: $client->close();
5003: &logthis("<font color='blue'>WARNING: "
5004: ."Rejected client $clientip, closing connection</font>");
5005: }
5006: }
5007:
5008: # =============================================================================
5009:
5010: &logthis("<font color='red'>CRITICAL: "
5011: ."Disconnect from $clientip ($clientname)</font>");
5012:
5013:
5014: # this exit is VERY important, otherwise the child will become
5015: # a producer of more and more children, forking yourself into
5016: # process death.
5017: exit;
5018:
5019: }
5020: #
5021: # Determine if a user is an author for the indicated domain.
5022: #
5023: # Parameters:
5024: # domain - domain to check in .
5025: # user - Name of user to check.
5026: #
5027: # Return:
5028: # 1 - User is an author for domain.
5029: # 0 - User is not an author for domain.
5030: sub is_author {
5031: my ($domain, $user) = @_;
5032:
5033: &Debug("is_author: $user @ $domain");
5034:
5035: my $hashref = &tie_user_hash($domain, $user, "roles",
5036: &GDBM_READER());
5037:
5038: # Author role should show up as a key /domain/_au
5039:
5040: my $key = "/$domain/_au";
5041: my $value = $hashref->{$key};
5042:
5043: if(defined($value)) {
5044: &Debug("$user @ $domain is an author");
5045: }
5046:
5047: return defined($value);
5048: }
5049: #
5050: # Checks to see if the input roleput request was to set
5051: # an author role. If so, invokes the lchtmldir script to set
5052: # up a correct public_html
5053: # Parameters:
5054: # request - The request sent to the rolesput subchunk.
5055: # We're looking for /domain/_au
5056: # domain - The domain in which the user is having roles doctored.
5057: # user - Name of the user for which the role is being put.
5058: # authtype - The authentication type associated with the user.
5059: #
5060: sub manage_permissions
5061: {
5062:
5063:
5064: my ($request, $domain, $user, $authtype) = @_;
5065:
5066: &Debug("manage_permissions: $request $domain $user $authtype");
5067:
5068: # See if the request is of the form /$domain/_au
5069: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
5070: my $execdir = $perlvar{'lonDaemons'};
5071: my $userhome= "/home/$user" ;
5072: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
5073: &Debug("Setting homedir permissions for $userhome");
5074: system("$execdir/lchtmldir $userhome $user $authtype");
5075: }
5076: }
5077:
5078:
5079: #
5080: # Return the full path of a user password file, whether it exists or not.
5081: # Parameters:
5082: # domain - Domain in which the password file lives.
5083: # user - name of the user.
5084: # Returns:
5085: # Full passwd path:
5086: #
5087: sub password_path {
5088: my ($domain, $user) = @_;
5089: return &propath($domain, $user).'/passwd';
5090: }
5091:
5092: # Password Filename
5093: # Returns the path to a passwd file given domain and user... only if
5094: # it exists.
5095: # Parameters:
5096: # domain - Domain in which to search.
5097: # user - username.
5098: # Returns:
5099: # - If the password file exists returns its path.
5100: # - If the password file does not exist, returns undefined.
5101: #
5102: sub password_filename {
5103: my ($domain, $user) = @_;
5104:
5105: Debug ("PasswordFilename called: dom = $domain user = $user");
5106:
5107: my $path = &password_path($domain, $user);
5108: Debug("PasswordFilename got path: $path");
5109: if(-e $path) {
5110: return $path;
5111: } else {
5112: return undef;
5113: }
5114: }
5115:
5116: #
5117: # Rewrite the contents of the user's passwd file.
5118: # Parameters:
5119: # domain - domain of the user.
5120: # name - User's name.
5121: # contents - New contents of the file.
5122: # Returns:
5123: # 0 - Failed.
5124: # 1 - Success.
5125: #
5126: sub rewrite_password_file {
5127: my ($domain, $user, $contents) = @_;
5128:
5129: my $file = &password_filename($domain, $user);
5130: if (defined $file) {
5131: my $pf = IO::File->new(">$file");
5132: if($pf) {
5133: print $pf "$contents\n";
5134: return 1;
5135: } else {
5136: return 0;
5137: }
5138: } else {
5139: return 0;
5140: }
5141:
5142: }
5143:
5144: #
5145: # get_auth_type - Determines the authorization type of a user in a domain.
5146:
5147: # Returns the authorization type or nouser if there is no such user.
5148: #
5149: sub get_auth_type
5150: {
5151:
5152: my ($domain, $user) = @_;
5153:
5154: Debug("get_auth_type( $domain, $user ) \n");
5155: my $proname = &propath($domain, $user);
5156: my $passwdfile = "$proname/passwd";
5157: if( -e $passwdfile ) {
5158: my $pf = IO::File->new($passwdfile);
5159: my $realpassword = <$pf>;
5160: chomp($realpassword);
5161: Debug("Password info = $realpassword\n");
5162: my ($authtype, $contentpwd) = split(/:/, $realpassword);
5163: Debug("Authtype = $authtype, content = $contentpwd\n");
5164: return "$authtype:$contentpwd";
5165: } else {
5166: Debug("Returning nouser");
5167: return "nouser";
5168: }
5169: }
5170:
5171: #
5172: # Validate a user given their domain, name and password. This utility
5173: # function is used by both AuthenticateHandler and ChangePasswordHandler
5174: # to validate the login credentials of a user.
5175: # Parameters:
5176: # $domain - The domain being logged into (this is required due to
5177: # the capability for multihomed systems.
5178: # $user - The name of the user being validated.
5179: # $password - The user's propoposed password.
5180: #
5181: # Returns:
5182: # 1 - The domain,user,pasword triplet corresponds to a valid
5183: # user.
5184: # 0 - The domain,user,password triplet is not a valid user.
5185: #
5186: sub validate_user {
5187: my ($domain, $user, $password) = @_;
5188:
5189:
5190: # Why negative ~pi you may well ask? Well this function is about
5191: # authentication, and therefore very important to get right.
5192: # I've initialized the flag that determines whether or not I've
5193: # validated correctly to a value it's not supposed to get.
5194: # At the end of this function. I'll ensure that it's not still that
5195: # value so we don't just wind up returning some accidental value
5196: # as a result of executing an unforseen code path that
5197: # did not set $validated. At the end of valid execution paths,
5198: # validated shoule be 1 for success or 0 for failuer.
5199:
5200: my $validated = -3.14159;
5201:
5202: # How we authenticate is determined by the type of authentication
5203: # the user has been assigned. If the authentication type is
5204: # "nouser", the user does not exist so we will return 0.
5205:
5206: my $contents = &get_auth_type($domain, $user);
5207: my ($howpwd, $contentpwd) = split(/:/, $contents);
5208:
5209: my $null = pack("C",0); # Used by kerberos auth types.
5210:
5211: if ($howpwd ne 'nouser') {
5212:
5213: if($howpwd eq "internal") { # Encrypted is in local password file.
5214: $validated = (crypt($password, $contentpwd) eq $contentpwd);
5215: }
5216: elsif ($howpwd eq "unix") { # User is a normal unix user.
5217: $contentpwd = (getpwnam($user))[1];
5218: if($contentpwd) {
5219: if($contentpwd eq 'x') { # Shadow password file...
5220: my $pwauth_path = "/usr/local/sbin/pwauth";
5221: open PWAUTH, "|$pwauth_path" or
5222: die "Cannot invoke authentication";
5223: print PWAUTH "$user\n$password\n";
5224: close PWAUTH;
5225: $validated = ! $?;
5226:
5227: } else { # Passwords in /etc/passwd.
5228: $validated = (crypt($password,
5229: $contentpwd) eq $contentpwd);
5230: }
5231: } else {
5232: $validated = 0;
5233: }
5234: }
5235: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
5236: if(! ($password =~ /$null/) ) {
5237: my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
5238: "",
5239: $contentpwd,,
5240: 'krbtgt',
5241: $contentpwd,
5242: 1,
5243: $password);
5244: if(!$k4error) {
5245: $validated = 1;
5246: } else {
5247: $validated = 0;
5248: &logthis('krb4: '.$user.', '.$contentpwd.', '.
5249: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
5250: }
5251: } else {
5252: $validated = 0; # Password has a match with null.
5253: }
5254: } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
5255: if(!($password =~ /$null/)) { # Null password not allowed.
5256: my $krbclient = &Authen::Krb5::parse_name($user.'@'
5257: .$contentpwd);
5258: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
5259: my $krbserver = &Authen::Krb5::parse_name($krbservice);
5260: my $credentials= &Authen::Krb5::cc_default();
5261: $credentials->initialize($krbclient);
5262: my $krbreturn = &Authen::Krb5::get_in_tkt_with_password($krbclient,
5263: $krbserver,
5264: $password,
5265: $credentials);
5266: $validated = ($krbreturn == 1);
5267: } else {
5268: $validated = 0;
5269: }
5270: } elsif ($howpwd eq "localauth") {
5271: # Authenticate via installation specific authentcation method:
5272: $validated = &localauth::localauth($user,
5273: $password,
5274: $contentpwd);
5275: } else { # Unrecognized auth is also bad.
5276: $validated = 0;
5277: }
5278: } else {
5279: $validated = 0;
5280: }
5281: #
5282: # $validated has the correct stat of the authentication:
5283: #
5284:
5285: unless ($validated != -3.14159) {
5286: # I >really really< want to know if this happens.
5287: # since it indicates that user authentication is badly
5288: # broken in some code path.
5289: #
5290: die "ValidateUser - failed to set the value of validated $domain, $user $password";
5291: }
5292: return $validated;
5293: }
5294:
5295:
5296: sub addline {
5297: my ($fname,$hostid,$ip,$newline)=@_;
5298: my $contents;
5299: my $found=0;
5300: my $expr='^'.$hostid.':'.$ip.':';
5301: $expr =~ s/\./\\\./g;
5302: my $sh;
5303: if ($sh=IO::File->new("$fname.subscription")) {
5304: while (my $subline=<$sh>) {
5305: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
5306: }
5307: $sh->close();
5308: }
5309: $sh=IO::File->new(">$fname.subscription");
5310: if ($contents) { print $sh $contents; }
5311: if ($newline) { print $sh $newline; }
5312: $sh->close();
5313: return $found;
5314: }
5315:
5316: sub get_chat {
5317: my ($cdom,$cname,$udom,$uname)=@_;
5318: my %hash;
5319: my $proname=&propath($cdom,$cname);
5320: my @entries=();
5321: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
5322: &GDBM_READER(),0640)) {
5323: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
5324: untie %hash;
5325: }
5326: my @participants=();
5327: my $cutoff=time-60;
5328: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
5329: &GDBM_WRCREAT(),0640)) {
5330: $hash{$uname.':'.$udom}=time;
5331: foreach (sort keys %hash) {
5332: if ($hash{$_}>$cutoff) {
5333: $participants[$#participants+1]='active_participant:'.$_;
5334: }
5335: }
5336: untie %hash;
5337: }
5338: return (@participants,@entries);
5339: }
5340:
5341: sub chat_add {
5342: my ($cdom,$cname,$newchat)=@_;
5343: my %hash;
5344: my $proname=&propath($cdom,$cname);
5345: my @entries=();
5346: my $time=time;
5347: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
5348: &GDBM_WRCREAT(),0640)) {
5349: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
5350: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
5351: my ($thentime,$idnum)=split(/\_/,$lastid);
5352: my $newid=$time.'_000000';
5353: if ($thentime==$time) {
5354: $idnum=~s/^0+//;
5355: $idnum++;
5356: $idnum=substr('000000'.$idnum,-6,6);
5357: $newid=$time.'_'.$idnum;
5358: }
5359: $hash{$newid}=$newchat;
5360: my $expired=$time-3600;
5361: foreach (keys %hash) {
5362: my ($thistime)=($_=~/(\d+)\_/);
5363: if ($thistime<$expired) {
5364: delete $hash{$_};
5365: }
5366: }
5367: untie %hash;
5368: }
5369: {
5370: my $hfh;
5371: if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
5372: print $hfh "$time:".&unescape($newchat)."\n";
5373: }
5374: }
5375: }
5376:
5377: sub unsub {
5378: my ($fname,$clientip)=@_;
5379: my $result;
5380: my $unsubs = 0; # Number of successful unsubscribes:
5381:
5382:
5383: # An old way subscriptions were handled was to have a
5384: # subscription marker file:
5385:
5386: Debug("Attempting unlink of $fname.$clientname");
5387: if (unlink("$fname.$clientname")) {
5388: $unsubs++; # Successful unsub via marker file.
5389: }
5390:
5391: # The more modern way to do it is to have a subscription list
5392: # file:
5393:
5394: if (-e "$fname.subscription") {
5395: my $found=&addline($fname,$clientname,$clientip,'');
5396: if ($found) {
5397: $unsubs++;
5398: }
5399: }
5400:
5401: # If either or both of these mechanisms succeeded in unsubscribing a
5402: # resource we can return ok:
5403:
5404: if($unsubs) {
5405: $result = "ok\n";
5406: } else {
5407: $result = "not_subscribed\n";
5408: }
5409:
5410: return $result;
5411: }
5412:
5413: sub currentversion {
5414: my $fname=shift;
5415: my $version=-1;
5416: my $ulsdir='';
5417: if ($fname=~/^(.+)\/[^\/]+$/) {
5418: $ulsdir=$1;
5419: }
5420: my ($fnamere1,$fnamere2);
5421: # remove version if already specified
5422: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
5423: # get the bits that go before and after the version number
5424: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
5425: $fnamere1=$1;
5426: $fnamere2='.'.$2;
5427: }
5428: if (-e $fname) { $version=1; }
5429: if (-e $ulsdir) {
5430: if(-d $ulsdir) {
5431: if (opendir(LSDIR,$ulsdir)) {
5432: my $ulsfn;
5433: while ($ulsfn=readdir(LSDIR)) {
5434: # see if this is a regular file (ignore links produced earlier)
5435: my $thisfile=$ulsdir.'/'.$ulsfn;
5436: unless (-l $thisfile) {
5437: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
5438: if ($1>$version) { $version=$1; }
5439: }
5440: }
5441: }
5442: closedir(LSDIR);
5443: $version++;
5444: }
5445: }
5446: }
5447: return $version;
5448: }
5449:
5450: sub thisversion {
5451: my $fname=shift;
5452: my $version=-1;
5453: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
5454: $version=$1;
5455: }
5456: return $version;
5457: }
5458:
5459: sub subscribe {
5460: my ($userinput,$clientip)=@_;
5461: my $result;
5462: my ($cmd,$fname)=split(/:/,$userinput);
5463: my $ownership=&ishome($fname);
5464: if ($ownership eq 'owner') {
5465: # explitly asking for the current version?
5466: unless (-e $fname) {
5467: my $currentversion=¤tversion($fname);
5468: if (&thisversion($fname)==$currentversion) {
5469: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
5470: my $root=$1;
5471: my $extension=$2;
5472: symlink($root.'.'.$extension,
5473: $root.'.'.$currentversion.'.'.$extension);
5474: unless ($extension=~/\.meta$/) {
5475: symlink($root.'.'.$extension.'.meta',
5476: $root.'.'.$currentversion.'.'.$extension.'.meta');
5477: }
5478: }
5479: }
5480: }
5481: if (-e $fname) {
5482: if (-d $fname) {
5483: $result="directory\n";
5484: } else {
5485: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
5486: my $now=time;
5487: my $found=&addline($fname,$clientname,$clientip,
5488: "$clientname:$clientip:$now\n");
5489: if ($found) { $result="$fname\n"; }
5490: # if they were subscribed to only meta data, delete that
5491: # subscription, when you subscribe to a file you also get
5492: # the metadata
5493: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
5494: $fname=~s/\/home\/httpd\/html\/res/raw/;
5495: $fname="http://$thisserver/".$fname;
5496: $result="$fname\n";
5497: }
5498: } else {
5499: $result="not_found\n";
5500: }
5501: } else {
5502: $result="rejected\n";
5503: }
5504: return $result;
5505: }
5506:
5507: sub make_passwd_file {
5508: my ($uname, $umode,$npass,$passfilename)=@_;
5509: my $result="ok\n";
5510: if ($umode eq 'krb4' or $umode eq 'krb5') {
5511: {
5512: my $pf = IO::File->new(">$passfilename");
5513: if ($pf) {
5514: print $pf "$umode:$npass\n";
5515: } else {
5516: $result = "pass_file_failed_error";
5517: }
5518: }
5519: } elsif ($umode eq 'internal') {
5520: my $salt=time;
5521: $salt=substr($salt,6,2);
5522: my $ncpass=crypt($npass,$salt);
5523: {
5524: &Debug("Creating internal auth");
5525: my $pf = IO::File->new(">$passfilename");
5526: if($pf) {
5527: print $pf "internal:$ncpass\n";
5528: } else {
5529: $result = "pass_file_failed_error";
5530: }
5531: }
5532: } elsif ($umode eq 'localauth') {
5533: {
5534: my $pf = IO::File->new(">$passfilename");
5535: if($pf) {
5536: print $pf "localauth:$npass\n";
5537: } else {
5538: $result = "pass_file_failed_error";
5539: }
5540: }
5541: } elsif ($umode eq 'unix') {
5542: {
5543: #
5544: # Don't allow the creation of privileged accounts!!! that would
5545: # be real bad!!!
5546: #
5547: my $uid = getpwnam($uname);
5548: if((defined $uid) && ($uid == 0)) {
5549: &logthis(">>>Attempted to create privilged account blocked");
5550: return "no_priv_account_error\n";
5551: }
5552:
5553: my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd";
5554:
5555: my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status";
5556: {
5557: &Debug("Executing external: ".$execpath);
5558: &Debug("user = ".$uname.", Password =". $npass);
5559: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
5560: print $se "$uname\n";
5561: print $se "$npass\n";
5562: print $se "$npass\n";
5563: print $se "$lc_error_file\n"; # Status -> unique file.
5564: }
5565: if (-r $lc_error_file) {
5566: &Debug("Opening error file: $lc_error_file");
5567: my $error = IO::File->new("< $lc_error_file");
5568: my $useraddok = <$error>;
5569: $error->close;
5570: unlink($lc_error_file);
5571:
5572: chomp $useraddok;
5573:
5574: if($useraddok > 0) {
5575: my $error_text = &lcuseraddstrerror($useraddok);
5576: &logthis("Failed lcuseradd: $error_text");
5577: $result = "lcuseradd_failed:$error_text\n";
5578: } else {
5579: my $pf = IO::File->new(">$passfilename");
5580: if($pf) {
5581: print $pf "unix:\n";
5582: } else {
5583: $result = "pass_file_failed_error";
5584: }
5585: }
5586: } else {
5587: &Debug("Could not locate lcuseradd error: $lc_error_file");
5588: $result="bug_lcuseradd_no_output_file";
5589: }
5590: }
5591: } elsif ($umode eq 'none') {
5592: {
5593: my $pf = IO::File->new("> $passfilename");
5594: if($pf) {
5595: print $pf "none:\n";
5596: } else {
5597: $result = "pass_file_failed_error";
5598: }
5599: }
5600: } else {
5601: $result="auth_mode_error\n";
5602: }
5603: return $result;
5604: }
5605:
5606: sub convert_photo {
5607: my ($start,$dest)=@_;
5608: system("convert $start $dest");
5609: }
5610:
5611: sub sethost {
5612: my ($remotereq) = @_;
5613: my (undef,$hostid)=split(/:/,$remotereq);
5614: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
5615: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
5616: $currenthostid =$hostid;
5617: $currentdomainid=$hostdom{$hostid};
5618: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
5619: } else {
5620: &logthis("Requested host id $hostid not an alias of ".
5621: $perlvar{'lonHostID'}." refusing connection");
5622: return 'unable_to_set';
5623: }
5624: return 'ok';
5625: }
5626:
5627: sub version {
5628: my ($userinput)=@_;
5629: $remoteVERSION=(split(/:/,$userinput))[1];
5630: return "version:$VERSION";
5631: }
5632:
5633: #There is a copy of this in lonnet.pm
5634: sub userload {
5635: my $numusers=0;
5636: {
5637: opendir(LONIDS,$perlvar{'lonIDsDir'});
5638: my $filename;
5639: my $curtime=time;
5640: while ($filename=readdir(LONIDS)) {
5641: if ($filename eq '.' || $filename eq '..') {next;}
5642: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
5643: if ($curtime-$mtime < 1800) { $numusers++; }
5644: }
5645: closedir(LONIDS);
5646: }
5647: my $userloadpercent=0;
5648: my $maxuserload=$perlvar{'lonUserLoadLim'};
5649: if ($maxuserload) {
5650: $userloadpercent=100*$numusers/$maxuserload;
5651: }
5652: $userloadpercent=sprintf("%.2f",$userloadpercent);
5653: return $userloadpercent;
5654: }
5655:
5656: # Routines for serializing arrays and hashes (copies from lonnet)
5657:
5658: sub array2str {
5659: my (@array) = @_;
5660: my $result=&arrayref2str(\@array);
5661: $result=~s/^__ARRAY_REF__//;
5662: $result=~s/__END_ARRAY_REF__$//;
5663: return $result;
5664: }
5665:
5666: sub arrayref2str {
5667: my ($arrayref) = @_;
5668: my $result='__ARRAY_REF__';
5669: foreach my $elem (@$arrayref) {
5670: if(ref($elem) eq 'ARRAY') {
5671: $result.=&arrayref2str($elem).'&';
5672: } elsif(ref($elem) eq 'HASH') {
5673: $result.=&hashref2str($elem).'&';
5674: } elsif(ref($elem)) {
5675: #print("Got a ref of ".(ref($elem))." skipping.");
5676: } else {
5677: $result.=&escape($elem).'&';
5678: }
5679: }
5680: $result=~s/\&$//;
5681: $result .= '__END_ARRAY_REF__';
5682: return $result;
5683: }
5684:
5685: sub hash2str {
5686: my (%hash) = @_;
5687: my $result=&hashref2str(\%hash);
5688: $result=~s/^__HASH_REF__//;
5689: $result=~s/__END_HASH_REF__$//;
5690: return $result;
5691: }
5692:
5693: sub hashref2str {
5694: my ($hashref)=@_;
5695: my $result='__HASH_REF__';
5696: foreach (sort(keys(%$hashref))) {
5697: if (ref($_) eq 'ARRAY') {
5698: $result.=&arrayref2str($_).'=';
5699: } elsif (ref($_) eq 'HASH') {
5700: $result.=&hashref2str($_).'=';
5701: } elsif (ref($_)) {
5702: $result.='=';
5703: #print("Got a ref of ".(ref($_))." skipping.");
5704: } else {
5705: if ($_) {$result.=&escape($_).'=';} else { last; }
5706: }
5707:
5708: if(ref($hashref->{$_}) eq 'ARRAY') {
5709: $result.=&arrayref2str($hashref->{$_}).'&';
5710: } elsif(ref($hashref->{$_}) eq 'HASH') {
5711: $result.=&hashref2str($hashref->{$_}).'&';
5712: } elsif(ref($hashref->{$_})) {
5713: $result.='&';
5714: #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
5715: } else {
5716: $result.=&escape($hashref->{$_}).'&';
5717: }
5718: }
5719: $result=~s/\&$//;
5720: $result .= '__END_HASH_REF__';
5721: return $result;
5722: }
5723:
5724: # ----------------------------------- POD (plain old documentation, CPAN style)
5725:
5726: =head1 NAME
5727:
5728: lond - "LON Daemon" Server (port "LOND" 5663)
5729:
5730: =head1 SYNOPSIS
5731:
5732: Usage: B<lond>
5733:
5734: Should only be run as user=www. This is a command-line script which
5735: is invoked by B<loncron>. There is no expectation that a typical user
5736: will manually start B<lond> from the command-line. (In other words,
5737: DO NOT START B<lond> YOURSELF.)
5738:
5739: =head1 DESCRIPTION
5740:
5741: There are two characteristics associated with the running of B<lond>,
5742: PROCESS MANAGEMENT (starting, stopping, handling child processes)
5743: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
5744: subscriptions, etc). These are described in two large
5745: sections below.
5746:
5747: B<PROCESS MANAGEMENT>
5748:
5749: Preforker - server who forks first. Runs as a daemon. HUPs.
5750: Uses IDEA encryption
5751:
5752: B<lond> forks off children processes that correspond to the other servers
5753: in the network. Management of these processes can be done at the
5754: parent process level or the child process level.
5755:
5756: B<logs/lond.log> is the location of log messages.
5757:
5758: The process management is now explained in terms of linux shell commands,
5759: subroutines internal to this code, and signal assignments:
5760:
5761: =over 4
5762:
5763: =item *
5764:
5765: PID is stored in B<logs/lond.pid>
5766:
5767: This is the process id number of the parent B<lond> process.
5768:
5769: =item *
5770:
5771: SIGTERM and SIGINT
5772:
5773: Parent signal assignment:
5774: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
5775:
5776: Child signal assignment:
5777: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
5778: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
5779: to restart a new child.)
5780:
5781: Command-line invocations:
5782: B<kill> B<-s> SIGTERM I<PID>
5783: B<kill> B<-s> SIGINT I<PID>
5784:
5785: Subroutine B<HUNTSMAN>:
5786: This is only invoked for the B<lond> parent I<PID>.
5787: This kills all the children, and then the parent.
5788: The B<lonc.pid> file is cleared.
5789:
5790: =item *
5791:
5792: SIGHUP
5793:
5794: Current bug:
5795: This signal can only be processed the first time
5796: on the parent process. Subsequent SIGHUP signals
5797: have no effect.
5798:
5799: Parent signal assignment:
5800: $SIG{HUP} = \&HUPSMAN;
5801:
5802: Child signal assignment:
5803: none (nothing happens)
5804:
5805: Command-line invocations:
5806: B<kill> B<-s> SIGHUP I<PID>
5807:
5808: Subroutine B<HUPSMAN>:
5809: This is only invoked for the B<lond> parent I<PID>,
5810: This kills all the children, and then the parent.
5811: The B<lond.pid> file is cleared.
5812:
5813: =item *
5814:
5815: SIGUSR1
5816:
5817: Parent signal assignment:
5818: $SIG{USR1} = \&USRMAN;
5819:
5820: Child signal assignment:
5821: $SIG{USR1}= \&logstatus;
5822:
5823: Command-line invocations:
5824: B<kill> B<-s> SIGUSR1 I<PID>
5825:
5826: Subroutine B<USRMAN>:
5827: When invoked for the B<lond> parent I<PID>,
5828: SIGUSR1 is sent to all the children, and the status of
5829: each connection is logged.
5830:
5831: =item *
5832:
5833: SIGUSR2
5834:
5835: Parent Signal assignment:
5836: $SIG{USR2} = \&UpdateHosts
5837:
5838: Child signal assignment:
5839: NONE
5840:
5841:
5842: =item *
5843:
5844: SIGCHLD
5845:
5846: Parent signal assignment:
5847: $SIG{CHLD} = \&REAPER;
5848:
5849: Child signal assignment:
5850: none
5851:
5852: Command-line invocations:
5853: B<kill> B<-s> SIGCHLD I<PID>
5854:
5855: Subroutine B<REAPER>:
5856: This is only invoked for the B<lond> parent I<PID>.
5857: Information pertaining to the child is removed.
5858: The socket port is cleaned up.
5859:
5860: =back
5861:
5862: B<SERVER-SIDE ACTIVITIES>
5863:
5864: Server-side information can be accepted in an encrypted or non-encrypted
5865: method.
5866:
5867: =over 4
5868:
5869: =item ping
5870:
5871: Query a client in the hosts.tab table; "Are you there?"
5872:
5873: =item pong
5874:
5875: Respond to a ping query.
5876:
5877: =item ekey
5878:
5879: Read in encrypted key, make cipher. Respond with a buildkey.
5880:
5881: =item load
5882:
5883: Respond with CPU load based on a computation upon /proc/loadavg.
5884:
5885: =item currentauth
5886:
5887: Reply with current authentication information (only over an
5888: encrypted channel).
5889:
5890: =item auth
5891:
5892: Only over an encrypted channel, reply as to whether a user's
5893: authentication information can be validated.
5894:
5895: =item passwd
5896:
5897: Allow for a password to be set.
5898:
5899: =item makeuser
5900:
5901: Make a user.
5902:
5903: =item passwd
5904:
5905: Allow for authentication mechanism and password to be changed.
5906:
5907: =item home
5908:
5909: Respond to a question "are you the home for a given user?"
5910:
5911: =item update
5912:
5913: Update contents of a subscribed resource.
5914:
5915: =item unsubscribe
5916:
5917: The server is unsubscribing from a resource.
5918:
5919: =item subscribe
5920:
5921: The server is subscribing to a resource.
5922:
5923: =item log
5924:
5925: Place in B<logs/lond.log>
5926:
5927: =item put
5928:
5929: stores hash in namespace
5930:
5931: =item rolesputy
5932:
5933: put a role into a user's environment
5934:
5935: =item get
5936:
5937: returns hash with keys from array
5938: reference filled in from namespace
5939:
5940: =item eget
5941:
5942: returns hash with keys from array
5943: reference filled in from namesp (encrypts the return communication)
5944:
5945: =item rolesget
5946:
5947: get a role from a user's environment
5948:
5949: =item del
5950:
5951: deletes keys out of array from namespace
5952:
5953: =item keys
5954:
5955: returns namespace keys
5956:
5957: =item dump
5958:
5959: dumps the complete (or key matching regexp) namespace into a hash
5960:
5961: =item store
5962:
5963: stores hash permanently
5964: for this url; hashref needs to be given and should be a \%hashname; the
5965: remaining args aren't required and if they aren't passed or are '' they will
5966: be derived from the ENV
5967:
5968: =item restore
5969:
5970: returns a hash for a given url
5971:
5972: =item querysend
5973:
5974: Tells client about the lonsql process that has been launched in response
5975: to a sent query.
5976:
5977: =item queryreply
5978:
5979: Accept information from lonsql and make appropriate storage in temporary
5980: file space.
5981:
5982: =item idput
5983:
5984: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
5985: for each student, defined perhaps by the institutional Registrar.)
5986:
5987: =item idget
5988:
5989: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
5990: for each student, defined perhaps by the institutional Registrar.)
5991:
5992: =item tmpput
5993:
5994: Accept and store information in temporary space.
5995:
5996: =item tmpget
5997:
5998: Send along temporarily stored information.
5999:
6000: =item ls
6001:
6002: List part of a user's directory.
6003:
6004: =item pushtable
6005:
6006: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
6007: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
6008: must be restored manually in case of a problem with the new table file.
6009: pushtable requires that the request be encrypted and validated via
6010: ValidateManager. The form of the command is:
6011: enc:pushtable tablename <tablecontents> \n
6012: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
6013: cleartext newline.
6014:
6015: =item Hanging up (exit or init)
6016:
6017: What to do when a client tells the server that they (the client)
6018: are leaving the network.
6019:
6020: =item unknown command
6021:
6022: If B<lond> is sent an unknown command (not in the list above),
6023: it replys to the client "unknown_cmd".
6024:
6025:
6026: =item UNKNOWN CLIENT
6027:
6028: If the anti-spoofing algorithm cannot verify the client,
6029: the client is rejected (with a "refused" message sent
6030: to the client, and the connection is closed.
6031:
6032: =back
6033:
6034: =head1 PREREQUISITES
6035:
6036: IO::Socket
6037: IO::File
6038: Apache::File
6039: Symbol
6040: POSIX
6041: Crypt::IDEA
6042: LWP::UserAgent()
6043: GDBM_File
6044: Authen::Krb4
6045: Authen::Krb5
6046:
6047: =head1 COREQUISITES
6048:
6049: =head1 OSNAMES
6050:
6051: linux
6052:
6053: =head1 SCRIPT CATEGORIES
6054:
6055: Server/Process
6056:
6057: =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