1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.93 2002/08/26 14:30:53 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: my $result=&make_passwd_file($umode,$npass,
818: $passfilename);
819: print $client $result;
820: }
821: } else {
822: print $client "refused\n";
823: }
824: # ------------------------------------------------------------------------ home
825: } elsif ($userinput =~ /^home/) {
826: my ($cmd,$udom,$uname)=split(/:/,$userinput);
827: chomp($uname);
828: my $proname=propath($udom,$uname);
829: if (-e $proname) {
830: print $client "found\n";
831: } else {
832: print $client "not_found\n";
833: }
834: # ---------------------------------------------------------------------- update
835: } elsif ($userinput =~ /^update/) {
836: my ($cmd,$fname)=split(/:/,$userinput);
837: my $ownership=ishome($fname);
838: if ($ownership eq 'not_owner') {
839: if (-e $fname) {
840: my ($dev,$ino,$mode,$nlink,
841: $uid,$gid,$rdev,$size,
842: $atime,$mtime,$ctime,
843: $blksize,$blocks)=stat($fname);
844: $now=time;
845: $since=$now-$atime;
846: if ($since>$perlvar{'lonExpire'}) {
847: $reply=
848: reply("unsub:$fname","$hostid{$clientip}");
849: unlink("$fname");
850: } else {
851: my $transname="$fname.in.transfer";
852: my $remoteurl=
853: reply("sub:$fname","$hostid{$clientip}");
854: my $response;
855: {
856: my $ua=new LWP::UserAgent;
857: my $request=new HTTP::Request('GET',"$remoteurl");
858: $response=$ua->request($request,$transname);
859: }
860: if ($response->is_error()) {
861: unlink($transname);
862: my $message=$response->status_line;
863: &logthis(
864: "LWP GET: $message for $fname ($remoteurl)");
865: } else {
866: if ($remoteurl!~/\.meta$/) {
867: my $ua=new LWP::UserAgent;
868: my $mrequest=
869: new HTTP::Request('GET',$remoteurl.'.meta');
870: my $mresponse=
871: $ua->request($mrequest,$fname.'.meta');
872: if ($mresponse->is_error()) {
873: unlink($fname.'.meta');
874: }
875: }
876: rename($transname,$fname);
877: }
878: }
879: print $client "ok\n";
880: } else {
881: print $client "not_found\n";
882: }
883: } else {
884: print $client "rejected\n";
885: }
886: # -------------------------------------- fetch a user file from a remote server
887: } elsif ($userinput =~ /^fetchuserfile/) {
888: my ($cmd,$fname)=split(/:/,$userinput);
889: my ($udom,$uname,$ufile)=split(/\//,$fname);
890: my $udir=propath($udom,$uname).'/userfiles';
891: unless (-e $udir) { mkdir($udir,0770); }
892: if (-e $udir) {
893: $ufile=~s/^[\.\~]+//;
894: $ufile=~s/\///g;
895: my $transname=$udir.'/'.$ufile;
896: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
897: my $response;
898: {
899: my $ua=new LWP::UserAgent;
900: my $request=new HTTP::Request('GET',"$remoteurl");
901: $response=$ua->request($request,$transname);
902: }
903: if ($response->is_error()) {
904: unlink($transname);
905: my $message=$response->status_line;
906: &logthis(
907: "LWP GET: $message for $fname ($remoteurl)");
908: print $client "failed\n";
909: } else {
910: print $client "ok\n";
911: }
912: } else {
913: print $client "not_home\n";
914: }
915: # ------------------------------------------ authenticate access to a user file
916: } elsif ($userinput =~ /^tokenauthuserfile/) {
917: my ($cmd,$fname,$session)=split(/:/,$userinput);
918: chomp($session);
919: $reply='non_auth';
920: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
921: $session.'.id')) {
922: while ($line=<ENVIN>) {
923: if ($line=~/userfile\.$fname\=/) { $reply='ok'; }
924: }
925: close(ENVIN);
926: print $client $reply."\n";
927: } else {
928: print $client "invalid_token\n";
929: }
930: # ----------------------------------------------------------------- unsubscribe
931: } elsif ($userinput =~ /^unsub/) {
932: my ($cmd,$fname)=split(/:/,$userinput);
933: if (-e $fname) {
934: print $client &unsub($client,$fname,$clientip);
935: } else {
936: print $client "not_found\n";
937: }
938: # ------------------------------------------------------------------- subscribe
939: } elsif ($userinput =~ /^sub/) {
940: print $client &subscribe($userinput,$clientip);
941: # ------------------------------------------------------------------------- log
942: } elsif ($userinput =~ /^log/) {
943: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
944: chomp($what);
945: my $proname=propath($udom,$uname);
946: my $now=time;
947: {
948: my $hfh;
949: if ($hfh=IO::File->new(">>$proname/activity.log")) {
950: print $hfh "$now:$hostid{$clientip}:$what\n";
951: print $client "ok\n";
952: } else {
953: print $client "error:$!\n";
954: }
955: }
956: # ------------------------------------------------------------------------- put
957: } elsif ($userinput =~ /^put/) {
958: my ($cmd,$udom,$uname,$namespace,$what)
959: =split(/:/,$userinput);
960: $namespace=~s/\//\_/g;
961: $namespace=~s/\W//g;
962: if ($namespace ne 'roles') {
963: chomp($what);
964: my $proname=propath($udom,$uname);
965: my $now=time;
966: unless ($namespace=~/^nohist\_/) {
967: my $hfh;
968: if (
969: $hfh=IO::File->new(">>$proname/$namespace.hist")
970: ) { print $hfh "P:$now:$what\n"; }
971: }
972: my @pairs=split(/\&/,$what);
973: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
974: foreach $pair (@pairs) {
975: ($key,$value)=split(/=/,$pair);
976: $hash{$key}=$value;
977: }
978: if (untie(%hash)) {
979: print $client "ok\n";
980: } else {
981: print $client "error:$!\n";
982: }
983: } else {
984: print $client "error:$!\n";
985: }
986: } else {
987: print $client "refused\n";
988: }
989: # -------------------------------------------------------------------- rolesput
990: } elsif ($userinput =~ /^rolesput/) {
991: &Debug("rolesput");
992: if ($wasenc==1) {
993: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
994: =split(/:/,$userinput);
995: &Debug("cmd = ".$cmd." exedom= ".$exedom.
996: "user = ".$exeuser." udom=".$udom.
997: "what = ".$what);
998: my $namespace='roles';
999: chomp($what);
1000: my $proname=propath($udom,$uname);
1001: my $now=time;
1002: {
1003: my $hfh;
1004: if (
1005: $hfh=IO::File->new(">>$proname/$namespace.hist")
1006: ) {
1007: print $hfh "P:$now:$exedom:$exeuser:$what\n";
1008: }
1009: }
1010: my @pairs=split(/\&/,$what);
1011: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1012: foreach $pair (@pairs) {
1013: ($key,$value)=split(/=/,$pair);
1014: &ManagePermissions($key, $udom, $uname,
1015: &GetAuthType( $udom,
1016: $uname));
1017: $hash{$key}=$value;
1018:
1019: }
1020: if (untie(%hash)) {
1021: print $client "ok\n";
1022: } else {
1023: print $client "error:$!\n";
1024: }
1025: } else {
1026: print $client "error:$!\n";
1027: }
1028: } else {
1029: print $client "refused\n";
1030: }
1031: # ------------------------------------------------------------------------- get
1032: } elsif ($userinput =~ /^get/) {
1033: my ($cmd,$udom,$uname,$namespace,$what)
1034: =split(/:/,$userinput);
1035: $namespace=~s/\//\_/g;
1036: $namespace=~s/\W//g;
1037: chomp($what);
1038: my @queries=split(/\&/,$what);
1039: my $proname=propath($udom,$uname);
1040: my $qresult='';
1041: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1042: for ($i=0;$i<=$#queries;$i++) {
1043: $qresult.="$hash{$queries[$i]}&";
1044: }
1045: if (untie(%hash)) {
1046: $qresult=~s/\&$//;
1047: print $client "$qresult\n";
1048: } else {
1049: print $client "error:$!\n";
1050: }
1051: } else {
1052: print $client "error:$!\n";
1053: }
1054: # ------------------------------------------------------------------------ eget
1055: } elsif ($userinput =~ /^eget/) {
1056: my ($cmd,$udom,$uname,$namespace,$what)
1057: =split(/:/,$userinput);
1058: $namespace=~s/\//\_/g;
1059: $namespace=~s/\W//g;
1060: chomp($what);
1061: my @queries=split(/\&/,$what);
1062: my $proname=propath($udom,$uname);
1063: my $qresult='';
1064: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1065: for ($i=0;$i<=$#queries;$i++) {
1066: $qresult.="$hash{$queries[$i]}&";
1067: }
1068: if (untie(%hash)) {
1069: $qresult=~s/\&$//;
1070: if ($cipher) {
1071: my $cmdlength=length($qresult);
1072: $qresult.=" ";
1073: my $encqresult='';
1074: for
1075: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
1076: $encqresult.=
1077: unpack("H16",
1078: $cipher->encrypt(substr($qresult,$encidx,8)));
1079: }
1080: print $client "enc:$cmdlength:$encqresult\n";
1081: } else {
1082: print $client "error:no_key\n";
1083: }
1084: } else {
1085: print $client "error:$!\n";
1086: }
1087: } else {
1088: print $client "error:$!\n";
1089: }
1090: # ------------------------------------------------------------------------- del
1091: } elsif ($userinput =~ /^del/) {
1092: my ($cmd,$udom,$uname,$namespace,$what)
1093: =split(/:/,$userinput);
1094: $namespace=~s/\//\_/g;
1095: $namespace=~s/\W//g;
1096: chomp($what);
1097: my $proname=propath($udom,$uname);
1098: my $now=time;
1099: unless ($namespace=~/^nohist\_/) {
1100: my $hfh;
1101: if (
1102: $hfh=IO::File->new(">>$proname/$namespace.hist")
1103: ) { print $hfh "D:$now:$what\n"; }
1104: }
1105: my @keys=split(/\&/,$what);
1106: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1107: foreach $key (@keys) {
1108: delete($hash{$key});
1109: }
1110: if (untie(%hash)) {
1111: print $client "ok\n";
1112: } else {
1113: print $client "error:$!\n";
1114: }
1115: } else {
1116: print $client "error:$!\n";
1117: }
1118: # ------------------------------------------------------------------------ keys
1119: } elsif ($userinput =~ /^keys/) {
1120: my ($cmd,$udom,$uname,$namespace)
1121: =split(/:/,$userinput);
1122: $namespace=~s/\//\_/g;
1123: $namespace=~s/\W//g;
1124: my $proname=propath($udom,$uname);
1125: my $qresult='';
1126: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1127: foreach $key (keys %hash) {
1128: $qresult.="$key&";
1129: }
1130: if (untie(%hash)) {
1131: $qresult=~s/\&$//;
1132: print $client "$qresult\n";
1133: } else {
1134: print $client "error:$!\n";
1135: }
1136: } else {
1137: print $client "error:$!\n";
1138: }
1139: # ------------------------------------------------------------------------ dump
1140: } elsif ($userinput =~ /^dump/) {
1141: my ($cmd,$udom,$uname,$namespace,$regexp)
1142: =split(/:/,$userinput);
1143: $namespace=~s/\//\_/g;
1144: $namespace=~s/\W//g;
1145: if (defined($regexp)) {
1146: $regexp=&unescape($regexp);
1147: } else {
1148: $regexp='.';
1149: }
1150: my $proname=propath($udom,$uname);
1151: my $qresult='';
1152: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1153: study($regexp);
1154: foreach $key (keys %hash) {
1155: my $unescapeKey = &unescape($key);
1156: if (eval('$unescapeKey=~/$regexp/')) {
1157: $qresult.="$key=$hash{$key}&";
1158: }
1159: }
1160: if (untie(%hash)) {
1161: $qresult=~s/\&$//;
1162: print $client "$qresult\n";
1163: } else {
1164: print $client "error:$!\n";
1165: }
1166: } else {
1167: print $client "error:$!\n";
1168: }
1169: # ----------------------------------------------------------------------- store
1170: } elsif ($userinput =~ /^store/) {
1171: my ($cmd,$udom,$uname,$namespace,$rid,$what)
1172: =split(/:/,$userinput);
1173: $namespace=~s/\//\_/g;
1174: $namespace=~s/\W//g;
1175: if ($namespace ne 'roles') {
1176: chomp($what);
1177: my $proname=propath($udom,$uname);
1178: my $now=time;
1179: unless ($namespace=~/^nohist\_/) {
1180: my $hfh;
1181: if (
1182: $hfh=IO::File->new(">>$proname/$namespace.hist")
1183: ) { print $hfh "P:$now:$rid:$what\n"; }
1184: }
1185: my @pairs=split(/\&/,$what);
1186:
1187: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1188: my @previouskeys=split(/&/,$hash{"keys:$rid"});
1189: my $key;
1190: $hash{"version:$rid"}++;
1191: my $version=$hash{"version:$rid"};
1192: my $allkeys='';
1193: foreach $pair (@pairs) {
1194: ($key,$value)=split(/=/,$pair);
1195: $allkeys.=$key.':';
1196: $hash{"$version:$rid:$key"}=$value;
1197: }
1198: $hash{"$version:$rid:timestamp"}=$now;
1199: $allkeys.='timestamp';
1200: $hash{"$version:keys:$rid"}=$allkeys;
1201: if (untie(%hash)) {
1202: print $client "ok\n";
1203: } else {
1204: print $client "error:$!\n";
1205: }
1206: } else {
1207: print $client "error:$!\n";
1208: }
1209: } else {
1210: print $client "refused\n";
1211: }
1212: # --------------------------------------------------------------------- restore
1213: } elsif ($userinput =~ /^restore/) {
1214: my ($cmd,$udom,$uname,$namespace,$rid)
1215: =split(/:/,$userinput);
1216: $namespace=~s/\//\_/g;
1217: $namespace=~s/\W//g;
1218: chomp($rid);
1219: my $proname=propath($udom,$uname);
1220: my $qresult='';
1221: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1222: my $version=$hash{"version:$rid"};
1223: $qresult.="version=$version&";
1224: my $scope;
1225: for ($scope=1;$scope<=$version;$scope++) {
1226: my $vkeys=$hash{"$scope:keys:$rid"};
1227: my @keys=split(/:/,$vkeys);
1228: my $key;
1229: $qresult.="$scope:keys=$vkeys&";
1230: foreach $key (@keys) {
1231: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
1232: }
1233: }
1234: if (untie(%hash)) {
1235: $qresult=~s/\&$//;
1236: print $client "$qresult\n";
1237: } else {
1238: print $client "error:$!\n";
1239: }
1240: } else {
1241: print $client "error:$!\n";
1242: }
1243: # -------------------------------------------------------------------- chatsend
1244: } elsif ($userinput =~ /^chatsend/) {
1245: my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
1246: &chatadd($cdom,$cnum,$newpost);
1247: print $client "ok\n";
1248: # -------------------------------------------------------------------- chatretr
1249: } elsif ($userinput =~ /^chatretr/) {
1250: my ($cmd,$cdom,$cnum)=split(/\:/,$userinput);
1251: my $reply='';
1252: foreach (&getchat($cdom,$cnum)) {
1253: $reply.=&escape($_).':';
1254: }
1255: $reply=~s/\:$//;
1256: print $client $reply."\n";
1257: # ------------------------------------------------------------------- querysend
1258: } elsif ($userinput =~ /^querysend/) {
1259: my ($cmd,$query,
1260: $arg1,$arg2,$arg3)=split(/\:/,$userinput);
1261: $query=~s/\n*$//g;
1262: print $client "".
1263: sqlreply("$hostid{$clientip}\&$query".
1264: "\&$arg1"."\&$arg2"."\&$arg3")."\n";
1265: # ------------------------------------------------------------------ queryreply
1266: } elsif ($userinput =~ /^queryreply/) {
1267: my ($cmd,$id,$reply)=split(/:/,$userinput);
1268: my $store;
1269: my $execdir=$perlvar{'lonDaemons'};
1270: if ($store=IO::File->new(">$execdir/tmp/$id")) {
1271: $reply=~s/\&/\n/g;
1272: print $store $reply;
1273: close $store;
1274: my $store2=IO::File->new(">$execdir/tmp/$id.end");
1275: print $store2 "done\n";
1276: close $store2;
1277: print $client "ok\n";
1278: }
1279: else {
1280: print $client "error:$!\n";
1281: }
1282: # ----------------------------------------------------------------------- idput
1283: } elsif ($userinput =~ /^idput/) {
1284: my ($cmd,$udom,$what)=split(/:/,$userinput);
1285: chomp($what);
1286: $udom=~s/\W//g;
1287: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1288: my $now=time;
1289: {
1290: my $hfh;
1291: if (
1292: $hfh=IO::File->new(">>$proname.hist")
1293: ) { print $hfh "P:$now:$what\n"; }
1294: }
1295: my @pairs=split(/\&/,$what);
1296: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT,0640)) {
1297: foreach $pair (@pairs) {
1298: ($key,$value)=split(/=/,$pair);
1299: $hash{$key}=$value;
1300: }
1301: if (untie(%hash)) {
1302: print $client "ok\n";
1303: } else {
1304: print $client "error:$!\n";
1305: }
1306: } else {
1307: print $client "error:$!\n";
1308: }
1309: # ----------------------------------------------------------------------- idget
1310: } elsif ($userinput =~ /^idget/) {
1311: my ($cmd,$udom,$what)=split(/:/,$userinput);
1312: chomp($what);
1313: $udom=~s/\W//g;
1314: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1315: my @queries=split(/\&/,$what);
1316: my $qresult='';
1317: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER,0640)) {
1318: for ($i=0;$i<=$#queries;$i++) {
1319: $qresult.="$hash{$queries[$i]}&";
1320: }
1321: if (untie(%hash)) {
1322: $qresult=~s/\&$//;
1323: print $client "$qresult\n";
1324: } else {
1325: print $client "error:$!\n";
1326: }
1327: } else {
1328: print $client "error:$!\n";
1329: }
1330: # ---------------------------------------------------------------------- tmpput
1331: } elsif ($userinput =~ /^tmpput/) {
1332: my ($cmd,$what)=split(/:/,$userinput);
1333: my $store;
1334: $tmpsnum++;
1335: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
1336: $id=~s/\W/\_/g;
1337: $what=~s/\n//g;
1338: my $execdir=$perlvar{'lonDaemons'};
1339: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
1340: print $store $what;
1341: close $store;
1342: print $client "$id\n";
1343: }
1344: else {
1345: print $client "error:$!\n";
1346: }
1347:
1348: # ---------------------------------------------------------------------- tmpget
1349: } elsif ($userinput =~ /^tmpget/) {
1350: my ($cmd,$id)=split(/:/,$userinput);
1351: chomp($id);
1352: $id=~s/\W/\_/g;
1353: my $store;
1354: my $execdir=$perlvar{'lonDaemons'};
1355: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
1356: my $reply=<$store>;
1357: print $client "$reply\n";
1358: close $store;
1359: }
1360: else {
1361: print $client "error:$!\n";
1362: }
1363:
1364: # -------------------------------------------------------------------------- ls
1365: } elsif ($userinput =~ /^ls/) {
1366: my ($cmd,$ulsdir)=split(/:/,$userinput);
1367: my $ulsout='';
1368: my $ulsfn;
1369: if (-e $ulsdir) {
1370: if(-d $ulsdir) {
1371: if (opendir(LSDIR,$ulsdir)) {
1372: while ($ulsfn=readdir(LSDIR)) {
1373: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1374: $ulsout.=$ulsfn.'&'.
1375: join('&',@ulsstats).':';
1376: }
1377: closedir(LSDIR);
1378: }
1379: } else {
1380: my @ulsstats=stat($ulsdir);
1381: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1382: }
1383: } else {
1384: $ulsout='no_such_dir';
1385: }
1386: if ($ulsout eq '') { $ulsout='empty'; }
1387: print $client "$ulsout\n";
1388: # ------------------------------------------------------------------ Hanging up
1389: } elsif (($userinput =~ /^exit/) ||
1390: ($userinput =~ /^init/)) {
1391: &logthis(
1392: "Client $clientip ($hostid{$clientip}) hanging up: $userinput");
1393: print $client "bye\n";
1394: $client->close();
1395: last;
1396: # ------------------------------------------------------------- unknown command
1397: } else {
1398: # unknown command
1399: print $client "unknown_cmd\n";
1400: }
1401: # -------------------------------------------------------------------- complete
1402: alarm(0);
1403: &status('Listening to '.$hostid{$clientip});
1404: }
1405: # --------------------------------------------- client unknown or fishy, refuse
1406: } else {
1407: print $client "refused\n";
1408: $client->close();
1409: &logthis("<font color=blue>WARNING: "
1410: ."Rejected client $clientip, closing connection</font>");
1411: }
1412: }
1413:
1414: # =============================================================================
1415:
1416: &logthis("<font color=red>CRITICAL: "
1417: ."Disconnect from $clientip ($hostid{$clientip})</font>");
1418: # tidy up gracefully and finish
1419:
1420: $server->close();
1421:
1422: # this exit is VERY important, otherwise the child will become
1423: # a producer of more and more children, forking yourself into
1424: # process death.
1425: exit;
1426: }
1427: }
1428:
1429:
1430: #
1431: # Checks to see if the input roleput request was to set
1432: # an author role. If so, invokes the lchtmldir script to set
1433: # up a correct public_html
1434: # Parameters:
1435: # request - The request sent to the rolesput subchunk.
1436: # We're looking for /domain/_au
1437: # domain - The domain in which the user is having roles doctored.
1438: # user - Name of the user for which the role is being put.
1439: # authtype - The authentication type associated with the user.
1440: #
1441: sub ManagePermissions
1442: {
1443: my $request = shift;
1444: my $domain = shift;
1445: my $user = shift;
1446: my $authtype= shift;
1447:
1448: # See if the request is of the form /$domain/_au
1449:
1450: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
1451: my $execdir = $perlvar{'lonDaemons'};
1452: my $userhome= "/home/$user" ;
1453: Debug("system $execdir/lchtmldir $userhome $system $authtype");
1454: system("$execdir/lchtmldir $userhome $user $authtype");
1455: }
1456: }
1457: #
1458: # GetAuthType - Determines the authorization type of a user in a domain.
1459:
1460: # Returns the authorization type or nouser if there is no such user.
1461: #
1462: sub GetAuthType
1463: {
1464: my $domain = shift;
1465: my $user = shift;
1466:
1467: Debug("GetAuthType( $domain, $user ) \n");
1468: my $proname = &propath($domain, $user);
1469: my $passwdfile = "$proname/passwd";
1470: if( -e $passwdfile ) {
1471: my $pf = IO::File->new($passwdfile);
1472: my $realpassword = <$pf>;
1473: chomp($realpassword);
1474: Debug("Password info = $realpassword\n");
1475: my ($authtype, $contentpwd) = split(/:/, $realpassword);
1476: Debug("Authtype = $authtype, content = $contentpwd\n");
1477: my $availinfo = '';
1478: if($authtype eq 'krb4' or $authtype eq 'krb5') {
1479: $availinfo = $contentpwd;
1480: }
1481:
1482: return "$authtype:$availinfo";
1483: }
1484: else {
1485: Debug("Returning nouser");
1486: return "nouser";
1487: }
1488: }
1489:
1490: sub addline {
1491: my ($fname,$hostid,$ip,$newline)=@_;
1492: my $contents;
1493: my $found=0;
1494: my $expr='^'.$hostid.':'.$ip.':';
1495: $expr =~ s/\./\\\./g;
1496: if ($sh=IO::File->new("$fname.subscription")) {
1497: while (my $subline=<$sh>) {
1498: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
1499: }
1500: $sh->close();
1501: }
1502: $sh=IO::File->new(">$fname.subscription");
1503: if ($contents) { print $sh $contents; }
1504: if ($newline) { print $sh $newline; }
1505: $sh->close();
1506: return $found;
1507: }
1508:
1509: sub getchat {
1510: my ($cdom,$cname)=@_;
1511: my %hash;
1512: my $proname=&propath($cdom,$cname);
1513: my @entries=();
1514: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
1515: &GDBM_READER(),0640)) {
1516: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
1517: untie %hash;
1518: }
1519: return @entries;
1520: }
1521:
1522: sub chatadd {
1523: my ($cdom,$cname,$newchat)=@_;
1524: my %hash;
1525: my $proname=&propath($cdom,$cname);
1526: my @entries=();
1527: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
1528: &GDBM_WRCREAT(),0640)) {
1529: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
1530: my $time=time;
1531: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
1532: my ($thentime,$idnum)=split(/\_/,$lastid);
1533: my $newid=$time.'_000000';
1534: if ($thentime==$time) {
1535: $idnum=~s/^0+//;
1536: $idnum++;
1537: $idnum=substr('000000'.$idnum,-6,6);
1538: $newid=$time.'_'.$idnum;
1539: }
1540: $hash{$newid}=$newchat;
1541: my $expired=$time-3600;
1542: foreach (keys %hash) {
1543: my ($thistime)=($_=~/(\d+)\_/);
1544: if ($thistime<$expired) {
1545: delete $hash{$_};
1546: }
1547: }
1548: untie %hash;
1549: }
1550: }
1551:
1552: sub unsub {
1553: my ($fname,$clientip)=@_;
1554: my $result;
1555: if (unlink("$fname.$hostid{$clientip}")) {
1556: $result="ok\n";
1557: } else {
1558: $result="not_subscribed\n";
1559: }
1560: if (-e "$fname.subscription") {
1561: my $found=&addline($fname,$hostid{$clientip},$clientip,'');
1562: if ($found) { $result="ok\n"; }
1563: } else {
1564: if ($result != "ok\n") { $result="not_subscribed\n"; }
1565: }
1566: return $result;
1567: }
1568:
1569: sub subscribe {
1570: my ($userinput,$clientip)=@_;
1571: my $result;
1572: my ($cmd,$fname)=split(/:/,$userinput);
1573: my $ownership=&ishome($fname);
1574: if ($ownership eq 'owner') {
1575: if (-e $fname) {
1576: if (-d $fname) {
1577: $result="directory\n";
1578: } else {
1579: if (-e "$fname.$hostid{$clientip}") {&unsub($fname,$clientip);}
1580: $now=time;
1581: my $found=&addline($fname,$hostid{$clientip},$clientip,
1582: "$hostid{$clientip}:$clientip:$now\n");
1583: if ($found) { $result="$fname\n"; }
1584: # if they were subscribed to only meta data, delete that
1585: # subscription, when you subscribe to a file you also get
1586: # the metadata
1587: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
1588: $fname=~s/\/home\/httpd\/html\/res/raw/;
1589: $fname="http://$thisserver/".$fname;
1590: $result="$fname\n";
1591: }
1592: } else {
1593: $result="not_found\n";
1594: }
1595: } else {
1596: $result="rejected\n";
1597: }
1598: return $result;
1599: }
1600:
1601: sub make_passwd_file {
1602: my ($umode,$npass,$passfilename)=@_;
1603: my $result="ok\n";
1604: if ($umode eq 'krb4' or $umode eq 'krb5') {
1605: {
1606: my $pf = IO::File->new(">$passfilename");
1607: print $pf "$umode:$npass\n";
1608: }
1609: } elsif ($umode eq 'internal') {
1610: my $salt=time;
1611: $salt=substr($salt,6,2);
1612: my $ncpass=crypt($npass,$salt);
1613: {
1614: &Debug("Creating internal auth");
1615: my $pf = IO::File->new(">$passfilename");
1616: print $pf "internal:$ncpass\n";
1617: }
1618: } elsif ($umode eq 'localauth') {
1619: {
1620: my $pf = IO::File->new(">$passfilename");
1621: print $pf "localauth:$npass\n";
1622: }
1623: } elsif ($umode eq 'unix') {
1624: {
1625: my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
1626: {
1627: &Debug("Executing external: ".$execpath);
1628: my $se = IO::File->new("|$execpath");
1629: print $se "$uname\n";
1630: print $se "$npass\n";
1631: print $se "$npass\n";
1632: }
1633: my $pf = IO::File->new(">$passfilename");
1634: print $pf "unix:\n";
1635: }
1636: } elsif ($umode eq 'none') {
1637: {
1638: my $pf = IO::File->new(">$passfilename");
1639: print $pf "none:\n";
1640: }
1641: } else {
1642: $result="auth_mode_error\n";
1643: }
1644: return $result;
1645: }
1646:
1647: # ----------------------------------- POD (plain old documentation, CPAN style)
1648:
1649: =head1 NAME
1650:
1651: lond - "LON Daemon" Server (port "LOND" 5663)
1652:
1653: =head1 SYNOPSIS
1654:
1655: Usage: B<lond>
1656:
1657: Should only be run as user=www. This is a command-line script which
1658: is invoked by B<loncron>. There is no expectation that a typical user
1659: will manually start B<lond> from the command-line. (In other words,
1660: DO NOT START B<lond> YOURSELF.)
1661:
1662: =head1 DESCRIPTION
1663:
1664: There are two characteristics associated with the running of B<lond>,
1665: PROCESS MANAGEMENT (starting, stopping, handling child processes)
1666: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
1667: subscriptions, etc). These are described in two large
1668: sections below.
1669:
1670: B<PROCESS MANAGEMENT>
1671:
1672: Preforker - server who forks first. Runs as a daemon. HUPs.
1673: Uses IDEA encryption
1674:
1675: B<lond> forks off children processes that correspond to the other servers
1676: in the network. Management of these processes can be done at the
1677: parent process level or the child process level.
1678:
1679: B<logs/lond.log> is the location of log messages.
1680:
1681: The process management is now explained in terms of linux shell commands,
1682: subroutines internal to this code, and signal assignments:
1683:
1684: =over 4
1685:
1686: =item *
1687:
1688: PID is stored in B<logs/lond.pid>
1689:
1690: This is the process id number of the parent B<lond> process.
1691:
1692: =item *
1693:
1694: SIGTERM and SIGINT
1695:
1696: Parent signal assignment:
1697: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
1698:
1699: Child signal assignment:
1700: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
1701: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
1702: to restart a new child.)
1703:
1704: Command-line invocations:
1705: B<kill> B<-s> SIGTERM I<PID>
1706: B<kill> B<-s> SIGINT I<PID>
1707:
1708: Subroutine B<HUNTSMAN>:
1709: This is only invoked for the B<lond> parent I<PID>.
1710: This kills all the children, and then the parent.
1711: The B<lonc.pid> file is cleared.
1712:
1713: =item *
1714:
1715: SIGHUP
1716:
1717: Current bug:
1718: This signal can only be processed the first time
1719: on the parent process. Subsequent SIGHUP signals
1720: have no effect.
1721:
1722: Parent signal assignment:
1723: $SIG{HUP} = \&HUPSMAN;
1724:
1725: Child signal assignment:
1726: none (nothing happens)
1727:
1728: Command-line invocations:
1729: B<kill> B<-s> SIGHUP I<PID>
1730:
1731: Subroutine B<HUPSMAN>:
1732: This is only invoked for the B<lond> parent I<PID>,
1733: This kills all the children, and then the parent.
1734: The B<lond.pid> file is cleared.
1735:
1736: =item *
1737:
1738: SIGUSR1
1739:
1740: Parent signal assignment:
1741: $SIG{USR1} = \&USRMAN;
1742:
1743: Child signal assignment:
1744: $SIG{USR1}= \&logstatus;
1745:
1746: Command-line invocations:
1747: B<kill> B<-s> SIGUSR1 I<PID>
1748:
1749: Subroutine B<USRMAN>:
1750: When invoked for the B<lond> parent I<PID>,
1751: SIGUSR1 is sent to all the children, and the status of
1752: each connection is logged.
1753:
1754: =item *
1755:
1756: SIGCHLD
1757:
1758: Parent signal assignment:
1759: $SIG{CHLD} = \&REAPER;
1760:
1761: Child signal assignment:
1762: none
1763:
1764: Command-line invocations:
1765: B<kill> B<-s> SIGCHLD I<PID>
1766:
1767: Subroutine B<REAPER>:
1768: This is only invoked for the B<lond> parent I<PID>.
1769: Information pertaining to the child is removed.
1770: The socket port is cleaned up.
1771:
1772: =back
1773:
1774: B<SERVER-SIDE ACTIVITIES>
1775:
1776: Server-side information can be accepted in an encrypted or non-encrypted
1777: method.
1778:
1779: =over 4
1780:
1781: =item ping
1782:
1783: Query a client in the hosts.tab table; "Are you there?"
1784:
1785: =item pong
1786:
1787: Respond to a ping query.
1788:
1789: =item ekey
1790:
1791: Read in encrypted key, make cipher. Respond with a buildkey.
1792:
1793: =item load
1794:
1795: Respond with CPU load based on a computation upon /proc/loadavg.
1796:
1797: =item currentauth
1798:
1799: Reply with current authentication information (only over an
1800: encrypted channel).
1801:
1802: =item auth
1803:
1804: Only over an encrypted channel, reply as to whether a user's
1805: authentication information can be validated.
1806:
1807: =item passwd
1808:
1809: Allow for a password to be set.
1810:
1811: =item makeuser
1812:
1813: Make a user.
1814:
1815: =item passwd
1816:
1817: Allow for authentication mechanism and password to be changed.
1818:
1819: =item home
1820:
1821: Respond to a question "are you the home for a given user?"
1822:
1823: =item update
1824:
1825: Update contents of a subscribed resource.
1826:
1827: =item unsubscribe
1828:
1829: The server is unsubscribing from a resource.
1830:
1831: =item subscribe
1832:
1833: The server is subscribing to a resource.
1834:
1835: =item log
1836:
1837: Place in B<logs/lond.log>
1838:
1839: =item put
1840:
1841: stores hash in namespace
1842:
1843: =item rolesput
1844:
1845: put a role into a user's environment
1846:
1847: =item get
1848:
1849: returns hash with keys from array
1850: reference filled in from namespace
1851:
1852: =item eget
1853:
1854: returns hash with keys from array
1855: reference filled in from namesp (encrypts the return communication)
1856:
1857: =item rolesget
1858:
1859: get a role from a user's environment
1860:
1861: =item del
1862:
1863: deletes keys out of array from namespace
1864:
1865: =item keys
1866:
1867: returns namespace keys
1868:
1869: =item dump
1870:
1871: dumps the complete (or key matching regexp) namespace into a hash
1872:
1873: =item store
1874:
1875: stores hash permanently
1876: for this url; hashref needs to be given and should be a \%hashname; the
1877: remaining args aren't required and if they aren't passed or are '' they will
1878: be derived from the ENV
1879:
1880: =item restore
1881:
1882: returns a hash for a given url
1883:
1884: =item querysend
1885:
1886: Tells client about the lonsql process that has been launched in response
1887: to a sent query.
1888:
1889: =item queryreply
1890:
1891: Accept information from lonsql and make appropriate storage in temporary
1892: file space.
1893:
1894: =item idput
1895:
1896: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
1897: for each student, defined perhaps by the institutional Registrar.)
1898:
1899: =item idget
1900:
1901: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
1902: for each student, defined perhaps by the institutional Registrar.)
1903:
1904: =item tmpput
1905:
1906: Accept and store information in temporary space.
1907:
1908: =item tmpget
1909:
1910: Send along temporarily stored information.
1911:
1912: =item ls
1913:
1914: List part of a user's directory.
1915:
1916: =item Hanging up (exit or init)
1917:
1918: What to do when a client tells the server that they (the client)
1919: are leaving the network.
1920:
1921: =item unknown command
1922:
1923: If B<lond> is sent an unknown command (not in the list above),
1924: it replys to the client "unknown_cmd".
1925:
1926: =item UNKNOWN CLIENT
1927:
1928: If the anti-spoofing algorithm cannot verify the client,
1929: the client is rejected (with a "refused" message sent
1930: to the client, and the connection is closed.
1931:
1932: =back
1933:
1934: =head1 PREREQUISITES
1935:
1936: IO::Socket
1937: IO::File
1938: Apache::File
1939: Symbol
1940: POSIX
1941: Crypt::IDEA
1942: LWP::UserAgent()
1943: GDBM_File
1944: Authen::Krb4
1945: Authen::Krb5
1946:
1947: =head1 COREQUISITES
1948:
1949: =head1 OSNAMES
1950:
1951: linux
1952:
1953: =head1 SCRIPT CATEGORIES
1954:
1955: Server/Process
1956:
1957: =cut
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