1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.92 2002/08/22 21:37:35 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: # http://www.lon-capa.org/
28: #
29: # 5/26/99,6/4,6/10,6/11,6/14,6/15,6/26,6/28,6/30,
30: # 7/8,7/9,7/10,7/12,7/17,7/19,9/21,
31: # 10/7,10/8,10/9,10/11,10/13,10/15,11/4,11/16,
32: # 12/7,12/15,01/06,01/11,01/12,01/14,2/8,
33: # 03/07,05/31 Gerd Kortemeyer
34: # 06/26 Scott Harrison
35: # 06/29,06/30,07/14,07/15,07/17,07/20,07/25,09/18 Gerd Kortemeyer
36: # 12/05 Scott Harrison
37: # 12/05,12/13,12/29 Gerd Kortemeyer
38: # YEAR=2001
39: # Jan 01 Scott Harrison
40: # 02/12 Gerd Kortemeyer
41: # 03/15 Scott Harrison
42: # 03/24 Gerd Kortemeyer
43: # 04/02 Scott Harrison
44: # 05/11,05/28,08/30 Gerd Kortemeyer
45: # 9/30,10/22,11/13,11/15,11/16 Scott Harrison
46: # 11/26,11/27 Gerd Kortemeyer
47: # 12/20 Scott Harrison
48: # 12/22 Gerd Kortemeyer
49: # YEAR=2002
50: # 01/20/02,02/05 Gerd Kortemeyer
51: # 02/05 Guy Albertelli
52: # 02/07 Scott Harrison
53: # 02/12 Gerd Kortemeyer
54: # 02/19 Matthew Hall
55: # 02/25 Gerd Kortemeyer
56: # 05/11 Scott Harrison
57: ###
58:
59: # based on "Perl Cookbook" ISBN 1-56592-243-3
60: # preforker - server who forks first
61: # runs as a daemon
62: # HUPs
63: # uses IDEA encryption
64:
65: use lib '/home/httpd/lib/perl/';
66: use LONCAPA::Configuration;
67:
68: use IO::Socket;
69: use IO::File;
70: use Apache::File;
71: use Symbol;
72: use POSIX;
73: use Crypt::IDEA;
74: use LWP::UserAgent();
75: use GDBM_File;
76: use Authen::Krb4;
77: use Authen::Krb5;
78: use lib '/home/httpd/lib/perl/';
79: use localauth;
80:
81: my $DEBUG = 0; # Non zero to enable debug log entries.
82:
83: my $status='';
84: my $lastlog='';
85:
86: # grabs exception and records it to log before exiting
87: sub catchexception {
88: my ($error)=@_;
89: $SIG{'QUIT'}='DEFAULT';
90: $SIG{__DIE__}='DEFAULT';
91: &logthis("<font color=red>CRITICAL: "
92: ."ABNORMAL EXIT. Child $$ for server $wasserver died through "
93: ."a crash with this error msg->[$error]</font>");
94: &logthis('Famous last words: '.$status.' - '.$lastlog);
95: if ($client) { print $client "error: $error\n"; }
96: $server->close();
97: die($error);
98: }
99:
100: sub timeout {
101: &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
102: &catchexception('Timeout');
103: }
104: # -------------------------------- Set signal handlers to record abnormal exits
105:
106: $SIG{'QUIT'}=\&catchexception;
107: $SIG{__DIE__}=\&catchexception;
108:
109: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
110: &status("Read loncapa_apache.conf and loncapa.conf");
111: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa_apache.conf',
112: 'loncapa.conf');
113: my %perlvar=%{$perlvarref};
114: undef $perlvarref;
115:
116: # ----------------------------- Make sure this process is running from user=www
117: my $wwwid=getpwnam('www');
118: if ($wwwid!=$<) {
119: $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
120: $subj="LON: $perlvar{'lonHostID'} User ID mismatch";
121: system("echo 'User ID mismatch. lond must be run as user www.' |\
122: mailto $emailto -s '$subj' > /dev/null");
123: exit 1;
124: }
125:
126: # --------------------------------------------- Check if other instance running
127:
128: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
129:
130: if (-e $pidfile) {
131: my $lfh=IO::File->new("$pidfile");
132: my $pide=<$lfh>;
133: chomp($pide);
134: if (kill 0 => $pide) { die "already running"; }
135: }
136:
137: $PREFORK=4; # number of children to maintain, at least four spare
138:
139: # ------------------------------------------------------------- Read hosts file
140:
141: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
142:
143: while ($configline=<CONFIG>) {
144: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
145: chomp($ip); $ip=~s/\D+$//;
146: $hostid{$ip}=$id;
147: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
148: $PREFORK++;
149: }
150: close(CONFIG);
151:
152: # establish SERVER socket, bind and listen.
153: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
154: Type => SOCK_STREAM,
155: Proto => 'tcp',
156: Reuse => 1,
157: Listen => 10 )
158: or die "making socket: $@\n";
159:
160: # --------------------------------------------------------- Do global variables
161:
162: # global variables
163:
164: $MAX_CLIENTS_PER_CHILD = 50; # number of clients each child should
165: # process
166: %children = (); # keys are current child process IDs
167: $children = 0; # current number of children
168:
169: sub REAPER { # takes care of dead children
170: $SIG{CHLD} = \&REAPER;
171: my $pid = wait;
172: if (defined($children{$pid})) {
173: &logthis("Child $pid died");
174: $children --;
175: delete $children{$pid};
176: } else {
177: &logthis("Unknown Child $pid died");
178: }
179: }
180:
181: sub HUNTSMAN { # signal handler for SIGINT
182: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
183: kill 'INT' => keys %children;
184: &logthis("Free socket: ".shutdown($server,2)); # free up socket
185: my $execdir=$perlvar{'lonDaemons'};
186: unlink("$execdir/logs/lond.pid");
187: &logthis("<font color=red>CRITICAL: Shutting down</font>");
188: exit; # clean up with dignity
189: }
190:
191: sub HUPSMAN { # signal handler for SIGHUP
192: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
193: kill 'INT' => keys %children;
194: &logthis("Free socket: ".shutdown($server,2)); # free up socket
195: &logthis("<font color=red>CRITICAL: Restarting</font>");
196: unlink("$execdir/logs/lond.pid");
197: my $execdir=$perlvar{'lonDaemons'};
198: exec("$execdir/lond"); # here we go again
199: }
200:
201: sub checkchildren {
202: &initnewstatus();
203: &logstatus();
204: &logthis('Going to check on the children');
205: $docdir=$perlvar{'lonDocRoot'};
206: foreach (sort keys %children) {
207: sleep 1;
208: unless (kill 'USR1' => $_) {
209: &logthis ('Child '.$_.' is dead');
210: &logstatus($$.' is dead');
211: }
212: }
213: sleep 5;
214: foreach (sort keys %children) {
215: unless (-e "$docdir/lon-status/londchld/$_.txt") {
216: &logthis('Child '.$_.' did not respond');
217: kill 9 => $_;
218: $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
219: $subj="LON: $perlvar{'lonHostID'} killed lond process $_";
220: my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
221: $execdir=$perlvar{'lonDaemons'};
222: $result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`
223: }
224: }
225: }
226:
227: # --------------------------------------------------------------------- Logging
228:
229: sub logthis {
230: my $message=shift;
231: my $execdir=$perlvar{'lonDaemons'};
232: my $fh=IO::File->new(">>$execdir/logs/lond.log");
233: my $now=time;
234: my $local=localtime($now);
235: $lastlog=$local.': '.$message;
236: print $fh "$local ($$): $message\n";
237: }
238:
239: # ------------------------- Conditional log if $DEBUG true.
240: sub Debug {
241: my $message = shift;
242: if($DEBUG) {
243: &logthis($message);
244: }
245: }
246: # ------------------------------------------------------------------ Log status
247:
248: sub logstatus {
249: my $docdir=$perlvar{'lonDocRoot'};
250: {
251: my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
252: print $fh $$."\t".$status."\t".$lastlog."\n";
253: $fh->close();
254: }
255: {
256: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
257: print $fh $status."\n".$lastlog."\n".time;
258: $fh->close();
259: }
260: }
261:
262: sub initnewstatus {
263: my $docdir=$perlvar{'lonDocRoot'};
264: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
265: my $now=time;
266: my $local=localtime($now);
267: print $fh "LOND status $local - parent $$\n\n";
268: opendir(DIR,"$docdir/lon-status/londchld");
269: while ($filename=readdir(DIR)) {
270: unlink("$docdir/lon-status/londchld/$filename");
271: }
272: closedir(DIR);
273: }
274:
275: # -------------------------------------------------------------- Status setting
276:
277: sub status {
278: my $what=shift;
279: my $now=time;
280: my $local=localtime($now);
281: $status=$local.': '.$what;
282: }
283:
284: # -------------------------------------------------------- Escape Special Chars
285:
286: sub escape {
287: my $str=shift;
288: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
289: return $str;
290: }
291:
292: # ----------------------------------------------------- Un-Escape Special Chars
293:
294: sub unescape {
295: my $str=shift;
296: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
297: return $str;
298: }
299:
300: # ----------------------------------------------------------- Send USR1 to lonc
301:
302: sub reconlonc {
303: my $peerfile=shift;
304: &logthis("Trying to reconnect for $peerfile");
305: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
306: if (my $fh=IO::File->new("$loncfile")) {
307: my $loncpid=<$fh>;
308: chomp($loncpid);
309: if (kill 0 => $loncpid) {
310: &logthis("lonc at pid $loncpid responding, sending USR1");
311: kill USR1 => $loncpid;
312: sleep 5;
313: if (-e "$peerfile") { return; }
314: &logthis("$peerfile still not there, give it another try");
315: sleep 10;
316: if (-e "$peerfile") { return; }
317: &logthis(
318: "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
319: } else {
320: &logthis(
321: "<font color=red>CRITICAL: "
322: ."lonc at pid $loncpid not responding, giving up</font>");
323: }
324: } else {
325: &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
326: }
327: }
328:
329: # -------------------------------------------------- Non-critical communication
330:
331: sub subreply {
332: my ($cmd,$server)=@_;
333: my $peerfile="$perlvar{'lonSockDir'}/$server";
334: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
335: Type => SOCK_STREAM,
336: Timeout => 10)
337: or return "con_lost";
338: print $sclient "$cmd\n";
339: my $answer=<$sclient>;
340: chomp($answer);
341: if (!$answer) { $answer="con_lost"; }
342: return $answer;
343: }
344:
345: sub reply {
346: my ($cmd,$server)=@_;
347: my $answer;
348: if ($server ne $perlvar{'lonHostID'}) {
349: $answer=subreply($cmd,$server);
350: if ($answer eq 'con_lost') {
351: $answer=subreply("ping",$server);
352: if ($answer ne $server) {
353: &logthis("sub reply: answer != server");
354: &reconlonc("$perlvar{'lonSockDir'}/$server");
355: }
356: $answer=subreply($cmd,$server);
357: }
358: } else {
359: $answer='self_reply';
360: }
361: return $answer;
362: }
363:
364: # -------------------------------------------------------------- Talk to lonsql
365:
366: sub sqlreply {
367: my ($cmd)=@_;
368: my $answer=subsqlreply($cmd);
369: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
370: return $answer;
371: }
372:
373: sub subsqlreply {
374: my ($cmd)=@_;
375: my $unixsock="mysqlsock";
376: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
377: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
378: Type => SOCK_STREAM,
379: Timeout => 10)
380: or return "con_lost";
381: print $sclient "$cmd\n";
382: my $answer=<$sclient>;
383: chomp($answer);
384: if (!$answer) { $answer="con_lost"; }
385: return $answer;
386: }
387:
388: # -------------------------------------------- Return path to profile directory
389:
390: sub propath {
391: my ($udom,$uname)=@_;
392: $udom=~s/\W//g;
393: $uname=~s/\W//g;
394: my $subdir=$uname.'__';
395: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
396: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
397: return $proname;
398: }
399:
400: # --------------------------------------- Is this the home server of an author?
401:
402: sub ishome {
403: my $author=shift;
404: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
405: my ($udom,$uname)=split(/\//,$author);
406: my $proname=propath($udom,$uname);
407: if (-e $proname) {
408: return 'owner';
409: } else {
410: return 'not_owner';
411: }
412: }
413:
414: # ======================================================= Continue main program
415: # ---------------------------------------------------- Fork once and dissociate
416:
417: $fpid=fork;
418: exit if $fpid;
419: die "Couldn't fork: $!" unless defined ($fpid);
420:
421: POSIX::setsid() or die "Can't start new session: $!";
422:
423: # ------------------------------------------------------- Write our PID on disk
424:
425: $execdir=$perlvar{'lonDaemons'};
426: open (PIDSAVE,">$execdir/logs/lond.pid");
427: print PIDSAVE "$$\n";
428: close(PIDSAVE);
429: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
430: &status('Starting');
431:
432: # ------------------------------------------------------- Now we are on our own
433:
434: # Fork off our children.
435: for (1 .. $PREFORK) {
436: make_new_child();
437: }
438:
439: # ----------------------------------------------------- Install signal handlers
440:
441: &status('Forked children');
442:
443: $SIG{CHLD} = \&REAPER;
444: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
445: $SIG{HUP} = \&HUPSMAN;
446: $SIG{USR1} = \&checkchildren;
447:
448: # And maintain the population.
449: while (1) {
450: &status('Sleeping');
451: sleep; # wait for a signal (i.e., child's death)
452: &logthis('Woke up');
453: &status('Woke up');
454: for ($i = $children; $i < $PREFORK; $i++) {
455: make_new_child(); # top up the child pool
456: }
457: }
458:
459: sub make_new_child {
460: my $pid;
461: my $cipher;
462: my $sigset;
463: &logthis("Attempting to start child");
464: # block signal for fork
465: $sigset = POSIX::SigSet->new(SIGINT);
466: sigprocmask(SIG_BLOCK, $sigset)
467: or die "Can't block SIGINT for fork: $!\n";
468:
469: die "fork: $!" unless defined ($pid = fork);
470:
471: if ($pid) {
472: # Parent records the child's birth and returns.
473: sigprocmask(SIG_UNBLOCK, $sigset)
474: or die "Can't unblock SIGINT for fork: $!\n";
475: $children{$pid} = 1;
476: $children++;
477: &status('Started child '.$pid);
478: return;
479: } else {
480: # Child can *not* return from this subroutine.
481: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
482: $SIG{USR1}= \&logstatus;
483: $SIG{ALRM}= \&timeout;
484: $lastlog='Forked ';
485: $status='Forked';
486:
487: # unblock signals
488: sigprocmask(SIG_UNBLOCK, $sigset)
489: or die "Can't unblock SIGINT for fork: $!\n";
490:
491: $tmpsnum=0;
492: #---------------------------------------------------- kerberos 5 initialization
493: &Authen::Krb5::init_context();
494: &Authen::Krb5::init_ets();
495:
496: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
497: for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
498: &status('Idle, waiting for connection');
499: $client = $server->accept() or last;
500: &status('Accepted connection');
501: # =============================================================================
502: # do something with the connection
503: # -----------------------------------------------------------------------------
504: # see if we know client and check for spoof IP by challenge
505: my $caller=getpeername($client);
506: my ($port,$iaddr)=unpack_sockaddr_in($caller);
507: my $clientip=inet_ntoa($iaddr);
508: my $clientrec=($hostid{$clientip} ne undef);
509: &logthis(
510: "<font color=yellow>INFO: Connection $i, $clientip ($hostid{$clientip})</font>"
511: );
512: &status("Connecting $clientip ($hostid{$clientip})");
513: my $clientok;
514: if ($clientrec) {
515: &status("Waiting for init from $clientip ($hostid{$clientip})");
516: my $remotereq=<$client>;
517: $remotereq=~s/\W//g;
518: if ($remotereq eq 'init') {
519: my $challenge="$$".time;
520: print $client "$challenge\n";
521: &status(
522: "Waiting for challenge reply from $clientip ($hostid{$clientip})");
523: $remotereq=<$client>;
524: $remotereq=~s/\W//g;
525: if ($challenge eq $remotereq) {
526: $clientok=1;
527: print $client "ok\n";
528: } else {
529: &logthis(
530: "<font color=blue>WARNING: $clientip did not reply challenge</font>");
531: &status('No challenge reply '.$clientip);
532: }
533: } else {
534: &logthis(
535: "<font color=blue>WARNING: "
536: ."$clientip failed to initialize: >$remotereq< </font>");
537: &status('No init '.$clientip);
538: }
539: } else {
540: &logthis(
541: "<font color=blue>WARNING: Unknown client $clientip</font>");
542: &status('Hung up on '.$clientip);
543: }
544: if ($clientok) {
545: # ---------------- New known client connecting, could mean machine online again
546:
547: &reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
548: &logthis(
549: "<font color=green>Established connection: $hostid{$clientip}</font>");
550: &status('Will listen to '.$hostid{$clientip});
551: # ------------------------------------------------------------ Process requests
552: while (my $userinput=<$client>) {
553: chomp($userinput);
554: Debug("Request = $userinput\n");
555: &status('Processing '.$hostid{$clientip}.': '.$userinput);
556: my $wasenc=0;
557: alarm(120);
558: # ------------------------------------------------------------ See if encrypted
559: if ($userinput =~ /^enc/) {
560: if ($cipher) {
561: my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
562: $userinput='';
563: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
564: $userinput.=
565: $cipher->decrypt(
566: pack("H16",substr($encinput,$encidx,16))
567: );
568: }
569: $userinput=substr($userinput,0,$cmdlength);
570: $wasenc=1;
571: }
572: }
573:
574: # ------------------------------------------------------------- Normal commands
575: # ------------------------------------------------------------------------ ping
576: if ($userinput =~ /^ping/) {
577: print $client "$perlvar{'lonHostID'}\n";
578: # ------------------------------------------------------------------------ pong
579: } elsif ($userinput =~ /^pong/) {
580: $reply=reply("ping",$hostid{$clientip});
581: print $client "$perlvar{'lonHostID'}:$reply\n";
582: # ------------------------------------------------------------------------ ekey
583: } elsif ($userinput =~ /^ekey/) {
584: my $buildkey=time.$$.int(rand 100000);
585: $buildkey=~tr/1-6/A-F/;
586: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
587: my $key=$perlvar{'lonHostID'}.$hostid{$clientip};
588: $key=~tr/a-z/A-Z/;
589: $key=~tr/G-P/0-9/;
590: $key=~tr/Q-Z/0-9/;
591: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
592: $key=substr($key,0,32);
593: my $cipherkey=pack("H32",$key);
594: $cipher=new IDEA $cipherkey;
595: print $client "$buildkey\n";
596: # ------------------------------------------------------------------------ load
597: } elsif ($userinput =~ /^load/) {
598: my $loadavg;
599: {
600: my $loadfile=IO::File->new('/proc/loadavg');
601: $loadavg=<$loadfile>;
602: }
603: $loadavg =~ s/\s.*//g;
604: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
605: print $client "$loadpercent\n";
606: # ----------------------------------------------------------------- currentauth
607: } elsif ($userinput =~ /^currentauth/) {
608: if ($wasenc==1) {
609: my ($cmd,$udom,$uname)=split(/:/,$userinput);
610: my $result = GetAuthType($udom, $uname);
611: if($result eq "nouser") {
612: print $client "unknown_user\n";
613: }
614: else {
615: print $client "$result\n"
616: }
617: } else {
618: print $client "refused\n";
619: }
620: # ------------------------------------------------------------------------ auth
621: } elsif ($userinput =~ /^auth/) {
622: if ($wasenc==1) {
623: my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
624: chomp($upass);
625: $upass=unescape($upass);
626: my $proname=propath($udom,$uname);
627: my $passfilename="$proname/passwd";
628: if (-e $passfilename) {
629: my $pf = IO::File->new($passfilename);
630: my $realpasswd=<$pf>;
631: chomp($realpasswd);
632: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
633: my $pwdcorrect=0;
634: if ($howpwd eq 'internal') {
635: $pwdcorrect=
636: (crypt($upass,$contentpwd) eq $contentpwd);
637: } elsif ($howpwd eq 'unix') {
638: $contentpwd=(getpwnam($uname))[1];
639: my $pwauth_path="/usr/local/sbin/pwauth";
640: unless ($contentpwd eq 'x') {
641: $pwdcorrect=
642: (crypt($upass,$contentpwd) eq $contentpwd);
643: }
644: elsif (-e $pwauth_path) {
645: open PWAUTH, "|$pwauth_path" or
646: die "Cannot invoke authentication";
647: print PWAUTH "$uname\n$upass\n";
648: close PWAUTH;
649: $pwdcorrect=!$?;
650: }
651: } elsif ($howpwd eq 'krb4') {
652: $null=pack("C",0);
653: unless ($upass=~/$null/) {
654: $pwdcorrect=(
655: Authen::Krb4::get_pw_in_tkt($uname,"",
656: $contentpwd,'krbtgt',$contentpwd,1,
657: $upass) == 0);
658: } else { $pwdcorrect=0; }
659: } elsif ($howpwd eq 'krb5') {
660: $null=pack("C",0);
661: unless ($upass=~/$null/) {
662: my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
663: my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
664: my $krbserver=&Authen::Krb5::parse_name($krbservice);
665: my $credentials=&Authen::Krb5::cc_default();
666: $credentials->initialize($krbclient);
667: my $krbreturn =
668: &Authen::Krb5::get_in_tkt_with_password(
669: $krbclient,$krbserver,$upass,$credentials);
670: # unless ($krbreturn) {
671: # &logthis("Krb5 Error: ".
672: # &Authen::Krb5::error());
673: # }
674: $pwdcorrect = ($krbreturn == 1);
675: } else { $pwdcorrect=0; }
676: } elsif ($howpwd eq 'localauth') {
677: $pwdcorrect=&localauth::localauth($uname,$upass,
678: $contentpwd);
679: }
680: if ($pwdcorrect) {
681: print $client "authorized\n";
682: } else {
683: print $client "non_authorized\n";
684: }
685: } else {
686: print $client "unknown_user\n";
687: }
688: } else {
689: print $client "refused\n";
690: }
691: # ---------------------------------------------------------------------- passwd
692: } elsif ($userinput =~ /^passwd/) {
693: if ($wasenc==1) {
694: my
695: ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
696: chomp($npass);
697: $upass=&unescape($upass);
698: $npass=&unescape($npass);
699: &logthis("Trying to change password for $uname");
700: my $proname=propath($udom,$uname);
701: my $passfilename="$proname/passwd";
702: if (-e $passfilename) {
703: my $realpasswd;
704: { my $pf = IO::File->new($passfilename);
705: $realpasswd=<$pf>; }
706: chomp($realpasswd);
707: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
708: if ($howpwd eq 'internal') {
709: if (crypt($upass,$contentpwd) eq $contentpwd) {
710: my $salt=time;
711: $salt=substr($salt,6,2);
712: my $ncpass=crypt($npass,$salt);
713: { my $pf = IO::File->new(">$passfilename");
714: print $pf "internal:$ncpass\n"; }
715: &logthis("Result of password change for $uname: pwchange_success");
716: print $client "ok\n";
717: } else {
718: print $client "non_authorized\n";
719: }
720: } elsif ($howpwd eq 'unix') {
721: # Unix means we have to access /etc/password
722: # one way or another.
723: # First: Make sure the current password is
724: # correct
725: $contentpwd=(getpwnam($uname))[1];
726: my $pwdcorrect = "0";
727: my $pwauth_path="/usr/local/sbin/pwauth";
728: unless ($contentpwd eq 'x') {
729: $pwdcorrect=
730: (crypt($upass,$contentpwd) eq $contentpwd);
731: } elsif (-e $pwauth_path) {
732: open PWAUTH, "|$pwauth_path" or
733: die "Cannot invoke authentication";
734: print PWAUTH "$uname\n$upass\n";
735: close PWAUTH;
736: $pwdcorrect=!$?;
737: }
738: if ($pwdcorrect) {
739: my $execdir=$perlvar{'lonDaemons'};
740: my $pf = IO::File->new("|$execdir/lcpasswd");
741: print $pf "$uname\n$npass\n$npass\n";
742: close $pf;
743: my $result = ($?>0 ? 'pwchange_failure'
744: : 'ok');
745: &logthis("Result of password change for $uname: $result");
746: print $client "$result\n";
747: } else {
748: print $client "non_authorized\n";
749: }
750: } else {
751: print $client "auth_mode_error\n";
752: }
753: } else {
754: print $client "unknown_user\n";
755: }
756: } else {
757: print $client "refused\n";
758: }
759: # -------------------------------------------------------------------- makeuser
760: } elsif ($userinput =~ /^makeuser/) {
761: &Debug("Make user received");
762: my $oldumask=umask(0077);
763: if ($wasenc==1) {
764: my
765: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
766: &Debug("cmd =".$cmd." $udom =".$udom.
767: " uname=".$uname);
768: chomp($npass);
769: $npass=&unescape($npass);
770: my $proname=propath($udom,$uname);
771: my $passfilename="$proname/passwd";
772: &Debug("Password file created will be:".
773: $passfilename);
774: if (-e $passfilename) {
775: print $client "already_exists\n";
776: } elsif ($udom ne $perlvar{'lonDefDomain'}) {
777: print $client "not_right_domain\n";
778: } else {
779: @fpparts=split(/\//,$proname);
780: $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
781: $fperror='';
782: for ($i=3;$i<=$#fpparts;$i++) {
783: $fpnow.='/'.$fpparts[$i];
784: unless (-e $fpnow) {
785: unless (mkdir($fpnow,0777)) {
786: $fperror="error:$!";
787: }
788: }
789: }
790: unless ($fperror) {
791: my $result=&make_passwd_file($umode,$npass,
792: $passfilename);
793: print $client $result;
794: } else {
795: print $client "$fperror\n";
796: }
797: }
798: } else {
799: print $client "refused\n";
800: }
801: umask($oldumask);
802: # -------------------------------------------------------------- changeuserauth
803: } elsif ($userinput =~ /^changeuserauth/) {
804: &Debug("Changing authorization");
805: if ($wasenc==1) {
806: my
807: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
808: chomp($npass);
809: &Debug("cmd = ".$cmd." domain= ".$udom.
810: "uname =".$uname." umode= ".$umode);
811: $npass=&unescape($npass);
812: my $proname=&propath($udom,$uname);
813: my $passfilename="$proname/passwd";
814: if ($udom ne $perlvar{'lonDefDomain'}) {
815: print $client "not_right_domain\n";
816: } else {
817: &make_passwd_file($umode,$npass,$passfilename);
818: print $client $result;
819: }
820: } else {
821: print $client "refused\n";
822: }
823: # ------------------------------------------------------------------------ home
824: } elsif ($userinput =~ /^home/) {
825: my ($cmd,$udom,$uname)=split(/:/,$userinput);
826: chomp($uname);
827: my $proname=propath($udom,$uname);
828: if (-e $proname) {
829: print $client "found\n";
830: } else {
831: print $client "not_found\n";
832: }
833: # ---------------------------------------------------------------------- update
834: } elsif ($userinput =~ /^update/) {
835: my ($cmd,$fname)=split(/:/,$userinput);
836: my $ownership=ishome($fname);
837: if ($ownership eq 'not_owner') {
838: if (-e $fname) {
839: my ($dev,$ino,$mode,$nlink,
840: $uid,$gid,$rdev,$size,
841: $atime,$mtime,$ctime,
842: $blksize,$blocks)=stat($fname);
843: $now=time;
844: $since=$now-$atime;
845: if ($since>$perlvar{'lonExpire'}) {
846: $reply=
847: reply("unsub:$fname","$hostid{$clientip}");
848: unlink("$fname");
849: } else {
850: my $transname="$fname.in.transfer";
851: my $remoteurl=
852: reply("sub:$fname","$hostid{$clientip}");
853: my $response;
854: {
855: my $ua=new LWP::UserAgent;
856: my $request=new HTTP::Request('GET',"$remoteurl");
857: $response=$ua->request($request,$transname);
858: }
859: if ($response->is_error()) {
860: unlink($transname);
861: my $message=$response->status_line;
862: &logthis(
863: "LWP GET: $message for $fname ($remoteurl)");
864: } else {
865: if ($remoteurl!~/\.meta$/) {
866: my $ua=new LWP::UserAgent;
867: my $mrequest=
868: new HTTP::Request('GET',$remoteurl.'.meta');
869: my $mresponse=
870: $ua->request($mrequest,$fname.'.meta');
871: if ($mresponse->is_error()) {
872: unlink($fname.'.meta');
873: }
874: }
875: rename($transname,$fname);
876: }
877: }
878: print $client "ok\n";
879: } else {
880: print $client "not_found\n";
881: }
882: } else {
883: print $client "rejected\n";
884: }
885: # -------------------------------------- fetch a user file from a remote server
886: } elsif ($userinput =~ /^fetchuserfile/) {
887: my ($cmd,$fname)=split(/:/,$userinput);
888: my ($udom,$uname,$ufile)=split(/\//,$fname);
889: my $udir=propath($udom,$uname).'/userfiles';
890: unless (-e $udir) { mkdir($udir,0770); }
891: if (-e $udir) {
892: $ufile=~s/^[\.\~]+//;
893: $ufile=~s/\///g;
894: my $transname=$udir.'/'.$ufile;
895: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
896: my $response;
897: {
898: my $ua=new LWP::UserAgent;
899: my $request=new HTTP::Request('GET',"$remoteurl");
900: $response=$ua->request($request,$transname);
901: }
902: if ($response->is_error()) {
903: unlink($transname);
904: my $message=$response->status_line;
905: &logthis(
906: "LWP GET: $message for $fname ($remoteurl)");
907: print $client "failed\n";
908: } else {
909: print $client "ok\n";
910: }
911: } else {
912: print $client "not_home\n";
913: }
914: # ------------------------------------------ authenticate access to a user file
915: } elsif ($userinput =~ /^tokenauthuserfile/) {
916: my ($cmd,$fname,$session)=split(/:/,$userinput);
917: chomp($session);
918: $reply='non_auth';
919: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
920: $session.'.id')) {
921: while ($line=<ENVIN>) {
922: if ($line=~/userfile\.$fname\=/) { $reply='ok'; }
923: }
924: close(ENVIN);
925: print $client $reply."\n";
926: } else {
927: print $client "invalid_token\n";
928: }
929: # ----------------------------------------------------------------- unsubscribe
930: } elsif ($userinput =~ /^unsub/) {
931: my ($cmd,$fname)=split(/:/,$userinput);
932: if (-e $fname) {
933: print $client &unsub($client,$fname,$clientip);
934: } else {
935: print $client "not_found\n";
936: }
937: # ------------------------------------------------------------------- subscribe
938: } elsif ($userinput =~ /^sub/) {
939: print $client &subscribe($userinput,$clientip);
940: # ------------------------------------------------------------------------- log
941: } elsif ($userinput =~ /^log/) {
942: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
943: chomp($what);
944: my $proname=propath($udom,$uname);
945: my $now=time;
946: {
947: my $hfh;
948: if ($hfh=IO::File->new(">>$proname/activity.log")) {
949: print $hfh "$now:$hostid{$clientip}:$what\n";
950: print $client "ok\n";
951: } else {
952: print $client "error:$!\n";
953: }
954: }
955: # ------------------------------------------------------------------------- put
956: } elsif ($userinput =~ /^put/) {
957: my ($cmd,$udom,$uname,$namespace,$what)
958: =split(/:/,$userinput);
959: $namespace=~s/\//\_/g;
960: $namespace=~s/\W//g;
961: if ($namespace ne 'roles') {
962: chomp($what);
963: my $proname=propath($udom,$uname);
964: my $now=time;
965: unless ($namespace=~/^nohist\_/) {
966: my $hfh;
967: if (
968: $hfh=IO::File->new(">>$proname/$namespace.hist")
969: ) { print $hfh "P:$now:$what\n"; }
970: }
971: my @pairs=split(/\&/,$what);
972: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
973: foreach $pair (@pairs) {
974: ($key,$value)=split(/=/,$pair);
975: $hash{$key}=$value;
976: }
977: if (untie(%hash)) {
978: print $client "ok\n";
979: } else {
980: print $client "error:$!\n";
981: }
982: } else {
983: print $client "error:$!\n";
984: }
985: } else {
986: print $client "refused\n";
987: }
988: # -------------------------------------------------------------------- rolesput
989: } elsif ($userinput =~ /^rolesput/) {
990: &Debug("rolesput");
991: if ($wasenc==1) {
992: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
993: =split(/:/,$userinput);
994: &Debug("cmd = ".$cmd." exedom= ".$exedom.
995: "user = ".$exeuser." udom=".$udom.
996: "what = ".$what);
997: my $namespace='roles';
998: chomp($what);
999: my $proname=propath($udom,$uname);
1000: my $now=time;
1001: {
1002: my $hfh;
1003: if (
1004: $hfh=IO::File->new(">>$proname/$namespace.hist")
1005: ) {
1006: print $hfh "P:$now:$exedom:$exeuser:$what\n";
1007: }
1008: }
1009: my @pairs=split(/\&/,$what);
1010: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1011: foreach $pair (@pairs) {
1012: ($key,$value)=split(/=/,$pair);
1013: &ManagePermissions($key, $udom, $uname,
1014: &GetAuthType( $udom,
1015: $uname));
1016: $hash{$key}=$value;
1017:
1018: }
1019: if (untie(%hash)) {
1020: print $client "ok\n";
1021: } else {
1022: print $client "error:$!\n";
1023: }
1024: } else {
1025: print $client "error:$!\n";
1026: }
1027: } else {
1028: print $client "refused\n";
1029: }
1030: # ------------------------------------------------------------------------- get
1031: } elsif ($userinput =~ /^get/) {
1032: my ($cmd,$udom,$uname,$namespace,$what)
1033: =split(/:/,$userinput);
1034: $namespace=~s/\//\_/g;
1035: $namespace=~s/\W//g;
1036: chomp($what);
1037: my @queries=split(/\&/,$what);
1038: my $proname=propath($udom,$uname);
1039: my $qresult='';
1040: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1041: for ($i=0;$i<=$#queries;$i++) {
1042: $qresult.="$hash{$queries[$i]}&";
1043: }
1044: if (untie(%hash)) {
1045: $qresult=~s/\&$//;
1046: print $client "$qresult\n";
1047: } else {
1048: print $client "error:$!\n";
1049: }
1050: } else {
1051: print $client "error:$!\n";
1052: }
1053: # ------------------------------------------------------------------------ eget
1054: } elsif ($userinput =~ /^eget/) {
1055: my ($cmd,$udom,$uname,$namespace,$what)
1056: =split(/:/,$userinput);
1057: $namespace=~s/\//\_/g;
1058: $namespace=~s/\W//g;
1059: chomp($what);
1060: my @queries=split(/\&/,$what);
1061: my $proname=propath($udom,$uname);
1062: my $qresult='';
1063: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1064: for ($i=0;$i<=$#queries;$i++) {
1065: $qresult.="$hash{$queries[$i]}&";
1066: }
1067: if (untie(%hash)) {
1068: $qresult=~s/\&$//;
1069: if ($cipher) {
1070: my $cmdlength=length($qresult);
1071: $qresult.=" ";
1072: my $encqresult='';
1073: for
1074: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
1075: $encqresult.=
1076: unpack("H16",
1077: $cipher->encrypt(substr($qresult,$encidx,8)));
1078: }
1079: print $client "enc:$cmdlength:$encqresult\n";
1080: } else {
1081: print $client "error:no_key\n";
1082: }
1083: } else {
1084: print $client "error:$!\n";
1085: }
1086: } else {
1087: print $client "error:$!\n";
1088: }
1089: # ------------------------------------------------------------------------- del
1090: } elsif ($userinput =~ /^del/) {
1091: my ($cmd,$udom,$uname,$namespace,$what)
1092: =split(/:/,$userinput);
1093: $namespace=~s/\//\_/g;
1094: $namespace=~s/\W//g;
1095: chomp($what);
1096: my $proname=propath($udom,$uname);
1097: my $now=time;
1098: unless ($namespace=~/^nohist\_/) {
1099: my $hfh;
1100: if (
1101: $hfh=IO::File->new(">>$proname/$namespace.hist")
1102: ) { print $hfh "D:$now:$what\n"; }
1103: }
1104: my @keys=split(/\&/,$what);
1105: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1106: foreach $key (@keys) {
1107: delete($hash{$key});
1108: }
1109: if (untie(%hash)) {
1110: print $client "ok\n";
1111: } else {
1112: print $client "error:$!\n";
1113: }
1114: } else {
1115: print $client "error:$!\n";
1116: }
1117: # ------------------------------------------------------------------------ keys
1118: } elsif ($userinput =~ /^keys/) {
1119: my ($cmd,$udom,$uname,$namespace)
1120: =split(/:/,$userinput);
1121: $namespace=~s/\//\_/g;
1122: $namespace=~s/\W//g;
1123: my $proname=propath($udom,$uname);
1124: my $qresult='';
1125: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1126: foreach $key (keys %hash) {
1127: $qresult.="$key&";
1128: }
1129: if (untie(%hash)) {
1130: $qresult=~s/\&$//;
1131: print $client "$qresult\n";
1132: } else {
1133: print $client "error:$!\n";
1134: }
1135: } else {
1136: print $client "error:$!\n";
1137: }
1138: # ------------------------------------------------------------------------ dump
1139: } elsif ($userinput =~ /^dump/) {
1140: my ($cmd,$udom,$uname,$namespace,$regexp)
1141: =split(/:/,$userinput);
1142: $namespace=~s/\//\_/g;
1143: $namespace=~s/\W//g;
1144: if (defined($regexp)) {
1145: $regexp=&unescape($regexp);
1146: } else {
1147: $regexp='.';
1148: }
1149: my $proname=propath($udom,$uname);
1150: my $qresult='';
1151: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1152: study($regexp);
1153: foreach $key (keys %hash) {
1154: my $unescapeKey = &unescape($key);
1155: if (eval('$unescapeKey=~/$regexp/')) {
1156: $qresult.="$key=$hash{$key}&";
1157: }
1158: }
1159: if (untie(%hash)) {
1160: $qresult=~s/\&$//;
1161: print $client "$qresult\n";
1162: } else {
1163: print $client "error:$!\n";
1164: }
1165: } else {
1166: print $client "error:$!\n";
1167: }
1168: # ----------------------------------------------------------------------- store
1169: } elsif ($userinput =~ /^store/) {
1170: my ($cmd,$udom,$uname,$namespace,$rid,$what)
1171: =split(/:/,$userinput);
1172: $namespace=~s/\//\_/g;
1173: $namespace=~s/\W//g;
1174: if ($namespace ne 'roles') {
1175: chomp($what);
1176: my $proname=propath($udom,$uname);
1177: my $now=time;
1178: unless ($namespace=~/^nohist\_/) {
1179: my $hfh;
1180: if (
1181: $hfh=IO::File->new(">>$proname/$namespace.hist")
1182: ) { print $hfh "P:$now:$rid:$what\n"; }
1183: }
1184: my @pairs=split(/\&/,$what);
1185:
1186: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1187: my @previouskeys=split(/&/,$hash{"keys:$rid"});
1188: my $key;
1189: $hash{"version:$rid"}++;
1190: my $version=$hash{"version:$rid"};
1191: my $allkeys='';
1192: foreach $pair (@pairs) {
1193: ($key,$value)=split(/=/,$pair);
1194: $allkeys.=$key.':';
1195: $hash{"$version:$rid:$key"}=$value;
1196: }
1197: $hash{"$version:$rid:timestamp"}=$now;
1198: $allkeys.='timestamp';
1199: $hash{"$version:keys:$rid"}=$allkeys;
1200: if (untie(%hash)) {
1201: print $client "ok\n";
1202: } else {
1203: print $client "error:$!\n";
1204: }
1205: } else {
1206: print $client "error:$!\n";
1207: }
1208: } else {
1209: print $client "refused\n";
1210: }
1211: # --------------------------------------------------------------------- restore
1212: } elsif ($userinput =~ /^restore/) {
1213: my ($cmd,$udom,$uname,$namespace,$rid)
1214: =split(/:/,$userinput);
1215: $namespace=~s/\//\_/g;
1216: $namespace=~s/\W//g;
1217: chomp($rid);
1218: my $proname=propath($udom,$uname);
1219: my $qresult='';
1220: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1221: my $version=$hash{"version:$rid"};
1222: $qresult.="version=$version&";
1223: my $scope;
1224: for ($scope=1;$scope<=$version;$scope++) {
1225: my $vkeys=$hash{"$scope:keys:$rid"};
1226: my @keys=split(/:/,$vkeys);
1227: my $key;
1228: $qresult.="$scope:keys=$vkeys&";
1229: foreach $key (@keys) {
1230: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
1231: }
1232: }
1233: if (untie(%hash)) {
1234: $qresult=~s/\&$//;
1235: print $client "$qresult\n";
1236: } else {
1237: print $client "error:$!\n";
1238: }
1239: } else {
1240: print $client "error:$!\n";
1241: }
1242: # -------------------------------------------------------------------- chatsend
1243: } elsif ($userinput =~ /^chatsend/) {
1244: my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
1245: &chatadd($cdom,$cnum,$newpost);
1246: print $client "ok\n";
1247: # -------------------------------------------------------------------- chatretr
1248: } elsif ($userinput =~ /^chatretr/) {
1249: my ($cmd,$cdom,$cnum)=split(/\:/,$userinput);
1250: my $reply='';
1251: foreach (&getchat($cdom,$cnum)) {
1252: $reply.=&escape($_).':';
1253: }
1254: $reply=~s/\:$//;
1255: print $client $reply."\n";
1256: # ------------------------------------------------------------------- querysend
1257: } elsif ($userinput =~ /^querysend/) {
1258: my ($cmd,$query,
1259: $arg1,$arg2,$arg3)=split(/\:/,$userinput);
1260: $query=~s/\n*$//g;
1261: print $client "".
1262: sqlreply("$hostid{$clientip}\&$query".
1263: "\&$arg1"."\&$arg2"."\&$arg3")."\n";
1264: # ------------------------------------------------------------------ queryreply
1265: } elsif ($userinput =~ /^queryreply/) {
1266: my ($cmd,$id,$reply)=split(/:/,$userinput);
1267: my $store;
1268: my $execdir=$perlvar{'lonDaemons'};
1269: if ($store=IO::File->new(">$execdir/tmp/$id")) {
1270: $reply=~s/\&/\n/g;
1271: print $store $reply;
1272: close $store;
1273: my $store2=IO::File->new(">$execdir/tmp/$id.end");
1274: print $store2 "done\n";
1275: close $store2;
1276: print $client "ok\n";
1277: }
1278: else {
1279: print $client "error:$!\n";
1280: }
1281: # ----------------------------------------------------------------------- idput
1282: } elsif ($userinput =~ /^idput/) {
1283: my ($cmd,$udom,$what)=split(/:/,$userinput);
1284: chomp($what);
1285: $udom=~s/\W//g;
1286: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1287: my $now=time;
1288: {
1289: my $hfh;
1290: if (
1291: $hfh=IO::File->new(">>$proname.hist")
1292: ) { print $hfh "P:$now:$what\n"; }
1293: }
1294: my @pairs=split(/\&/,$what);
1295: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT,0640)) {
1296: foreach $pair (@pairs) {
1297: ($key,$value)=split(/=/,$pair);
1298: $hash{$key}=$value;
1299: }
1300: if (untie(%hash)) {
1301: print $client "ok\n";
1302: } else {
1303: print $client "error:$!\n";
1304: }
1305: } else {
1306: print $client "error:$!\n";
1307: }
1308: # ----------------------------------------------------------------------- idget
1309: } elsif ($userinput =~ /^idget/) {
1310: my ($cmd,$udom,$what)=split(/:/,$userinput);
1311: chomp($what);
1312: $udom=~s/\W//g;
1313: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1314: my @queries=split(/\&/,$what);
1315: my $qresult='';
1316: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER,0640)) {
1317: for ($i=0;$i<=$#queries;$i++) {
1318: $qresult.="$hash{$queries[$i]}&";
1319: }
1320: if (untie(%hash)) {
1321: $qresult=~s/\&$//;
1322: print $client "$qresult\n";
1323: } else {
1324: print $client "error:$!\n";
1325: }
1326: } else {
1327: print $client "error:$!\n";
1328: }
1329: # ---------------------------------------------------------------------- tmpput
1330: } elsif ($userinput =~ /^tmpput/) {
1331: my ($cmd,$what)=split(/:/,$userinput);
1332: my $store;
1333: $tmpsnum++;
1334: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
1335: $id=~s/\W/\_/g;
1336: $what=~s/\n//g;
1337: my $execdir=$perlvar{'lonDaemons'};
1338: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
1339: print $store $what;
1340: close $store;
1341: print $client "$id\n";
1342: }
1343: else {
1344: print $client "error:$!\n";
1345: }
1346:
1347: # ---------------------------------------------------------------------- tmpget
1348: } elsif ($userinput =~ /^tmpget/) {
1349: my ($cmd,$id)=split(/:/,$userinput);
1350: chomp($id);
1351: $id=~s/\W/\_/g;
1352: my $store;
1353: my $execdir=$perlvar{'lonDaemons'};
1354: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
1355: my $reply=<$store>;
1356: print $client "$reply\n";
1357: close $store;
1358: }
1359: else {
1360: print $client "error:$!\n";
1361: }
1362:
1363: # -------------------------------------------------------------------------- ls
1364: } elsif ($userinput =~ /^ls/) {
1365: my ($cmd,$ulsdir)=split(/:/,$userinput);
1366: my $ulsout='';
1367: my $ulsfn;
1368: if (-e $ulsdir) {
1369: if(-d $ulsdir) {
1370: if (opendir(LSDIR,$ulsdir)) {
1371: while ($ulsfn=readdir(LSDIR)) {
1372: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1373: $ulsout.=$ulsfn.'&'.
1374: join('&',@ulsstats).':';
1375: }
1376: closedir(LSDIR);
1377: }
1378: } else {
1379: my @ulsstats=stat($ulsdir);
1380: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1381: }
1382: } else {
1383: $ulsout='no_such_dir';
1384: }
1385: if ($ulsout eq '') { $ulsout='empty'; }
1386: print $client "$ulsout\n";
1387: # ------------------------------------------------------------------ Hanging up
1388: } elsif (($userinput =~ /^exit/) ||
1389: ($userinput =~ /^init/)) {
1390: &logthis(
1391: "Client $clientip ($hostid{$clientip}) hanging up: $userinput");
1392: print $client "bye\n";
1393: $client->close();
1394: last;
1395: # ------------------------------------------------------------- unknown command
1396: } else {
1397: # unknown command
1398: print $client "unknown_cmd\n";
1399: }
1400: # -------------------------------------------------------------------- complete
1401: alarm(0);
1402: &status('Listening to '.$hostid{$clientip});
1403: }
1404: # --------------------------------------------- client unknown or fishy, refuse
1405: } else {
1406: print $client "refused\n";
1407: $client->close();
1408: &logthis("<font color=blue>WARNING: "
1409: ."Rejected client $clientip, closing connection</font>");
1410: }
1411: }
1412:
1413: # =============================================================================
1414:
1415: &logthis("<font color=red>CRITICAL: "
1416: ."Disconnect from $clientip ($hostid{$clientip})</font>");
1417: # tidy up gracefully and finish
1418:
1419: $server->close();
1420:
1421: # this exit is VERY important, otherwise the child will become
1422: # a producer of more and more children, forking yourself into
1423: # process death.
1424: exit;
1425: }
1426: }
1427:
1428:
1429: #
1430: # Checks to see if the input roleput request was to set
1431: # an author role. If so, invokes the lchtmldir script to set
1432: # up a correct public_html
1433: # Parameters:
1434: # request - The request sent to the rolesput subchunk.
1435: # We're looking for /domain/_au
1436: # domain - The domain in which the user is having roles doctored.
1437: # user - Name of the user for which the role is being put.
1438: # authtype - The authentication type associated with the user.
1439: #
1440: sub ManagePermissions
1441: {
1442: my $request = shift;
1443: my $domain = shift;
1444: my $user = shift;
1445: my $authtype= shift;
1446:
1447: # See if the request is of the form /$domain/_au
1448:
1449: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
1450: my $execdir = $perlvar{'lonDaemons'};
1451: my $userhome= "/home/$user" ;
1452: Debug("system $execdir/lchtmldir $userhome $system $authtype");
1453: system("$execdir/lchtmldir $userhome $user $authtype");
1454: }
1455: }
1456: #
1457: # GetAuthType - Determines the authorization type of a user in a domain.
1458:
1459: # Returns the authorization type or nouser if there is no such user.
1460: #
1461: sub GetAuthType
1462: {
1463: my $domain = shift;
1464: my $user = shift;
1465:
1466: Debug("GetAuthType( $domain, $user ) \n");
1467: my $proname = &propath($domain, $user);
1468: my $passwdfile = "$proname/passwd";
1469: if( -e $passwdfile ) {
1470: my $pf = IO::File->new($passwdfile);
1471: my $realpassword = <$pf>;
1472: chomp($realpassword);
1473: Debug("Password info = $realpassword\n");
1474: my ($authtype, $contentpwd) = split(/:/, $realpassword);
1475: Debug("Authtype = $authtype, content = $contentpwd\n");
1476: my $availinfo = '';
1477: if($authtype eq 'krb4' or $authtype eq 'krb5') {
1478: $availinfo = $contentpwd;
1479: }
1480:
1481: return "$authtype:$availinfo";
1482: }
1483: else {
1484: Debug("Returning nouser");
1485: return "nouser";
1486: }
1487: }
1488:
1489: sub addline {
1490: my ($fname,$hostid,$ip,$newline)=@_;
1491: my $contents;
1492: my $found=0;
1493: my $expr='^'.$hostid.':'.$ip.':';
1494: $expr =~ s/\./\\\./g;
1495: if ($sh=IO::File->new("$fname.subscription")) {
1496: while (my $subline=<$sh>) {
1497: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
1498: }
1499: $sh->close();
1500: }
1501: $sh=IO::File->new(">$fname.subscription");
1502: if ($contents) { print $sh $contents; }
1503: if ($newline) { print $sh $newline; }
1504: $sh->close();
1505: return $found;
1506: }
1507:
1508: sub getchat {
1509: my ($cdom,$cname)=@_;
1510: my %hash;
1511: my $proname=&propath($cdom,$cname);
1512: my @entries=();
1513: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
1514: &GDBM_READER(),0640)) {
1515: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
1516: untie %hash;
1517: }
1518: return @entries;
1519: }
1520:
1521: sub chatadd {
1522: my ($cdom,$cname,$newchat)=@_;
1523: my %hash;
1524: my $proname=&propath($cdom,$cname);
1525: my @entries=();
1526: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
1527: &GDBM_WRCREAT(),0640)) {
1528: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
1529: my $time=time;
1530: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
1531: my ($thentime,$idnum)=split(/\_/,$lastid);
1532: my $newid=$time.'_000000';
1533: if ($thentime==$time) {
1534: $idnum=~s/^0+//;
1535: $idnum++;
1536: $idnum=substr('000000'.$idnum,-6,6);
1537: $newid=$time.'_'.$idnum;
1538: }
1539: $hash{$newid}=$newchat;
1540: my $expired=$time-3600;
1541: foreach (keys %hash) {
1542: my ($thistime)=($_=~/(\d+)\_/);
1543: if ($thistime<$expired) {
1544: delete $hash{$_};
1545: }
1546: }
1547: untie %hash;
1548: }
1549: }
1550:
1551: sub unsub {
1552: my ($fname,$clientip)=@_;
1553: my $result;
1554: if (unlink("$fname.$hostid{$clientip}")) {
1555: $result="ok\n";
1556: } else {
1557: $result="not_subscribed\n";
1558: }
1559: if (-e "$fname.subscription") {
1560: my $found=&addline($fname,$hostid{$clientip},$clientip,'');
1561: if ($found) { $result="ok\n"; }
1562: } else {
1563: if ($result != "ok\n") { $result="not_subscribed\n"; }
1564: }
1565: return $result;
1566: }
1567:
1568: sub subscribe {
1569: my ($userinput,$clientip)=@_;
1570: my $result;
1571: my ($cmd,$fname)=split(/:/,$userinput);
1572: my $ownership=&ishome($fname);
1573: if ($ownership eq 'owner') {
1574: if (-e $fname) {
1575: if (-d $fname) {
1576: $result="directory\n";
1577: } else {
1578: if (-e "$fname.$hostid{$clientip}") {&unsub($fname,$clientip);}
1579: $now=time;
1580: my $found=&addline($fname,$hostid{$clientip},$clientip,
1581: "$hostid{$clientip}:$clientip:$now\n");
1582: if ($found) { $result="$fname\n"; }
1583: # if they were subscribed to only meta data, delete that
1584: # subscription, when you subscribe to a file you also get
1585: # the metadata
1586: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
1587: $fname=~s/\/home\/httpd\/html\/res/raw/;
1588: $fname="http://$thisserver/".$fname;
1589: $result="$fname\n";
1590: }
1591: } else {
1592: $result="not_found\n";
1593: }
1594: } else {
1595: $result="rejected\n";
1596: }
1597: return $result;
1598: }
1599:
1600: sub make_passwd_file {
1601: my ($umode,$npass,$passfilename)=@_;
1602: my $result="ok\n";
1603: if ($umode eq 'krb4' or $umode eq 'krb5') {
1604: {
1605: my $pf = IO::File->new(">$passfilename");
1606: print $pf "$umode:$npass\n";
1607: }
1608: } elsif ($umode eq 'internal') {
1609: my $salt=time;
1610: $salt=substr($salt,6,2);
1611: my $ncpass=crypt($npass,$salt);
1612: {
1613: &Debug("Creating internal auth");
1614: my $pf = IO::File->new(">$passfilename");
1615: print $pf "internal:$ncpass\n";
1616: }
1617: } elsif ($umode eq 'localauth') {
1618: {
1619: my $pf = IO::File->new(">$passfilename");
1620: print $pf "localauth:$npass\n";
1621: }
1622: } elsif ($umode eq 'unix') {
1623: {
1624: my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
1625: {
1626: &Debug("Executing external: ".$execpath);
1627: my $se = IO::File->new("|$execpath");
1628: print $se "$uname\n";
1629: print $se "$npass\n";
1630: print $se "$npass\n";
1631: }
1632: my $pf = IO::File->new(">$passfilename");
1633: print $pf "unix:\n";
1634: }
1635: } elsif ($umode eq 'none') {
1636: {
1637: my $pf = IO::File->new(">$passfilename");
1638: print $pf "none:\n";
1639: }
1640: } else {
1641: $result="auth_mode_error\n";
1642: }
1643: return $result;
1644: }
1645:
1646: # ----------------------------------- POD (plain old documentation, CPAN style)
1647:
1648: =head1 NAME
1649:
1650: lond - "LON Daemon" Server (port "LOND" 5663)
1651:
1652: =head1 SYNOPSIS
1653:
1654: Usage: B<lond>
1655:
1656: Should only be run as user=www. This is a command-line script which
1657: is invoked by B<loncron>. There is no expectation that a typical user
1658: will manually start B<lond> from the command-line. (In other words,
1659: DO NOT START B<lond> YOURSELF.)
1660:
1661: =head1 DESCRIPTION
1662:
1663: There are two characteristics associated with the running of B<lond>,
1664: PROCESS MANAGEMENT (starting, stopping, handling child processes)
1665: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
1666: subscriptions, etc). These are described in two large
1667: sections below.
1668:
1669: B<PROCESS MANAGEMENT>
1670:
1671: Preforker - server who forks first. Runs as a daemon. HUPs.
1672: Uses IDEA encryption
1673:
1674: B<lond> forks off children processes that correspond to the other servers
1675: in the network. Management of these processes can be done at the
1676: parent process level or the child process level.
1677:
1678: B<logs/lond.log> is the location of log messages.
1679:
1680: The process management is now explained in terms of linux shell commands,
1681: subroutines internal to this code, and signal assignments:
1682:
1683: =over 4
1684:
1685: =item *
1686:
1687: PID is stored in B<logs/lond.pid>
1688:
1689: This is the process id number of the parent B<lond> process.
1690:
1691: =item *
1692:
1693: SIGTERM and SIGINT
1694:
1695: Parent signal assignment:
1696: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
1697:
1698: Child signal assignment:
1699: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
1700: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
1701: to restart a new child.)
1702:
1703: Command-line invocations:
1704: B<kill> B<-s> SIGTERM I<PID>
1705: B<kill> B<-s> SIGINT I<PID>
1706:
1707: Subroutine B<HUNTSMAN>:
1708: This is only invoked for the B<lond> parent I<PID>.
1709: This kills all the children, and then the parent.
1710: The B<lonc.pid> file is cleared.
1711:
1712: =item *
1713:
1714: SIGHUP
1715:
1716: Current bug:
1717: This signal can only be processed the first time
1718: on the parent process. Subsequent SIGHUP signals
1719: have no effect.
1720:
1721: Parent signal assignment:
1722: $SIG{HUP} = \&HUPSMAN;
1723:
1724: Child signal assignment:
1725: none (nothing happens)
1726:
1727: Command-line invocations:
1728: B<kill> B<-s> SIGHUP I<PID>
1729:
1730: Subroutine B<HUPSMAN>:
1731: This is only invoked for the B<lond> parent I<PID>,
1732: This kills all the children, and then the parent.
1733: The B<lond.pid> file is cleared.
1734:
1735: =item *
1736:
1737: SIGUSR1
1738:
1739: Parent signal assignment:
1740: $SIG{USR1} = \&USRMAN;
1741:
1742: Child signal assignment:
1743: $SIG{USR1}= \&logstatus;
1744:
1745: Command-line invocations:
1746: B<kill> B<-s> SIGUSR1 I<PID>
1747:
1748: Subroutine B<USRMAN>:
1749: When invoked for the B<lond> parent I<PID>,
1750: SIGUSR1 is sent to all the children, and the status of
1751: each connection is logged.
1752:
1753: =item *
1754:
1755: SIGCHLD
1756:
1757: Parent signal assignment:
1758: $SIG{CHLD} = \&REAPER;
1759:
1760: Child signal assignment:
1761: none
1762:
1763: Command-line invocations:
1764: B<kill> B<-s> SIGCHLD I<PID>
1765:
1766: Subroutine B<REAPER>:
1767: This is only invoked for the B<lond> parent I<PID>.
1768: Information pertaining to the child is removed.
1769: The socket port is cleaned up.
1770:
1771: =back
1772:
1773: B<SERVER-SIDE ACTIVITIES>
1774:
1775: Server-side information can be accepted in an encrypted or non-encrypted
1776: method.
1777:
1778: =over 4
1779:
1780: =item ping
1781:
1782: Query a client in the hosts.tab table; "Are you there?"
1783:
1784: =item pong
1785:
1786: Respond to a ping query.
1787:
1788: =item ekey
1789:
1790: Read in encrypted key, make cipher. Respond with a buildkey.
1791:
1792: =item load
1793:
1794: Respond with CPU load based on a computation upon /proc/loadavg.
1795:
1796: =item currentauth
1797:
1798: Reply with current authentication information (only over an
1799: encrypted channel).
1800:
1801: =item auth
1802:
1803: Only over an encrypted channel, reply as to whether a user's
1804: authentication information can be validated.
1805:
1806: =item passwd
1807:
1808: Allow for a password to be set.
1809:
1810: =item makeuser
1811:
1812: Make a user.
1813:
1814: =item passwd
1815:
1816: Allow for authentication mechanism and password to be changed.
1817:
1818: =item home
1819:
1820: Respond to a question "are you the home for a given user?"
1821:
1822: =item update
1823:
1824: Update contents of a subscribed resource.
1825:
1826: =item unsubscribe
1827:
1828: The server is unsubscribing from a resource.
1829:
1830: =item subscribe
1831:
1832: The server is subscribing to a resource.
1833:
1834: =item log
1835:
1836: Place in B<logs/lond.log>
1837:
1838: =item put
1839:
1840: stores hash in namespace
1841:
1842: =item rolesput
1843:
1844: put a role into a user's environment
1845:
1846: =item get
1847:
1848: returns hash with keys from array
1849: reference filled in from namespace
1850:
1851: =item eget
1852:
1853: returns hash with keys from array
1854: reference filled in from namesp (encrypts the return communication)
1855:
1856: =item rolesget
1857:
1858: get a role from a user's environment
1859:
1860: =item del
1861:
1862: deletes keys out of array from namespace
1863:
1864: =item keys
1865:
1866: returns namespace keys
1867:
1868: =item dump
1869:
1870: dumps the complete (or key matching regexp) namespace into a hash
1871:
1872: =item store
1873:
1874: stores hash permanently
1875: for this url; hashref needs to be given and should be a \%hashname; the
1876: remaining args aren't required and if they aren't passed or are '' they will
1877: be derived from the ENV
1878:
1879: =item restore
1880:
1881: returns a hash for a given url
1882:
1883: =item querysend
1884:
1885: Tells client about the lonsql process that has been launched in response
1886: to a sent query.
1887:
1888: =item queryreply
1889:
1890: Accept information from lonsql and make appropriate storage in temporary
1891: file space.
1892:
1893: =item idput
1894:
1895: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
1896: for each student, defined perhaps by the institutional Registrar.)
1897:
1898: =item idget
1899:
1900: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
1901: for each student, defined perhaps by the institutional Registrar.)
1902:
1903: =item tmpput
1904:
1905: Accept and store information in temporary space.
1906:
1907: =item tmpget
1908:
1909: Send along temporarily stored information.
1910:
1911: =item ls
1912:
1913: List part of a user's directory.
1914:
1915: =item Hanging up (exit or init)
1916:
1917: What to do when a client tells the server that they (the client)
1918: are leaving the network.
1919:
1920: =item unknown command
1921:
1922: If B<lond> is sent an unknown command (not in the list above),
1923: it replys to the client "unknown_cmd".
1924:
1925: =item UNKNOWN CLIENT
1926:
1927: If the anti-spoofing algorithm cannot verify the client,
1928: the client is rejected (with a "refused" message sent
1929: to the client, and the connection is closed.
1930:
1931: =back
1932:
1933: =head1 PREREQUISITES
1934:
1935: IO::Socket
1936: IO::File
1937: Apache::File
1938: Symbol
1939: POSIX
1940: Crypt::IDEA
1941: LWP::UserAgent()
1942: GDBM_File
1943: Authen::Krb4
1944: Authen::Krb5
1945:
1946: =head1 COREQUISITES
1947:
1948: =head1 OSNAMES
1949:
1950: linux
1951:
1952: =head1 SCRIPT CATEGORIES
1953:
1954: Server/Process
1955:
1956: =cut
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