1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.95 2002/09/09 14:04:02 harris41 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.conf and loncapa_apache.conf");
111: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
112: my %perlvar=%{$perlvarref};
113: undef $perlvarref;
114:
115: # ----------------------------- Make sure this process is running from user=www
116: my $wwwid=getpwnam('www');
117: if ($wwwid!=$<) {
118: $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
119: $subj="LON: $perlvar{'lonHostID'} User ID mismatch";
120: system("echo 'User ID mismatch. lond must be run as user www.' |\
121: mailto $emailto -s '$subj' > /dev/null");
122: exit 1;
123: }
124:
125: # --------------------------------------------- Check if other instance running
126:
127: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
128:
129: if (-e $pidfile) {
130: my $lfh=IO::File->new("$pidfile");
131: my $pide=<$lfh>;
132: chomp($pide);
133: if (kill 0 => $pide) { die "already running"; }
134: }
135:
136: $PREFORK=4; # number of children to maintain, at least four spare
137:
138: # ------------------------------------------------------------- Read hosts file
139:
140: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
141:
142: while ($configline=<CONFIG>) {
143: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
144: chomp($ip); $ip=~s/\D+$//;
145: $hostid{$ip}=$id;
146: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
147: $PREFORK++;
148: }
149: close(CONFIG);
150:
151: # establish SERVER socket, bind and listen.
152: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
153: Type => SOCK_STREAM,
154: Proto => 'tcp',
155: Reuse => 1,
156: Listen => 10 )
157: or die "making socket: $@\n";
158:
159: # --------------------------------------------------------- Do global variables
160:
161: # global variables
162:
163: $MAX_CLIENTS_PER_CHILD = 50; # number of clients each child should
164: # process
165: %children = (); # keys are current child process IDs
166: $children = 0; # current number of children
167:
168: sub REAPER { # takes care of dead children
169: $SIG{CHLD} = \&REAPER;
170: my $pid = wait;
171: if (defined($children{$pid})) {
172: &logthis("Child $pid died");
173: $children --;
174: delete $children{$pid};
175: } else {
176: &logthis("Unknown Child $pid died");
177: }
178: }
179:
180: sub HUNTSMAN { # signal handler for SIGINT
181: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
182: kill 'INT' => keys %children;
183: &logthis("Free socket: ".shutdown($server,2)); # free up socket
184: my $execdir=$perlvar{'lonDaemons'};
185: unlink("$execdir/logs/lond.pid");
186: &logthis("<font color=red>CRITICAL: Shutting down</font>");
187: exit; # clean up with dignity
188: }
189:
190: sub HUPSMAN { # signal handler for SIGHUP
191: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
192: kill 'INT' => keys %children;
193: &logthis("Free socket: ".shutdown($server,2)); # free up socket
194: &logthis("<font color=red>CRITICAL: Restarting</font>");
195: unlink("$execdir/logs/lond.pid");
196: my $execdir=$perlvar{'lonDaemons'};
197: exec("$execdir/lond"); # here we go again
198: }
199:
200: sub checkchildren {
201: &initnewstatus();
202: &logstatus();
203: &logthis('Going to check on the children');
204: $docdir=$perlvar{'lonDocRoot'};
205: foreach (sort keys %children) {
206: sleep 1;
207: unless (kill 'USR1' => $_) {
208: &logthis ('Child '.$_.' is dead');
209: &logstatus($$.' is dead');
210: }
211: }
212: sleep 5;
213: foreach (sort keys %children) {
214: unless (-e "$docdir/lon-status/londchld/$_.txt") {
215: &logthis('Child '.$_.' did not respond');
216: kill 9 => $_;
217: $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
218: $subj="LON: $perlvar{'lonHostID'} killed lond process $_";
219: my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
220: $execdir=$perlvar{'lonDaemons'};
221: $result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`
222: }
223: }
224: }
225:
226: # --------------------------------------------------------------------- Logging
227:
228: sub logthis {
229: my $message=shift;
230: my $execdir=$perlvar{'lonDaemons'};
231: my $fh=IO::File->new(">>$execdir/logs/lond.log");
232: my $now=time;
233: my $local=localtime($now);
234: $lastlog=$local.': '.$message;
235: print $fh "$local ($$): $message\n";
236: }
237:
238: # ------------------------- Conditional log if $DEBUG true.
239: sub Debug {
240: my $message = shift;
241: if($DEBUG) {
242: &logthis($message);
243: }
244: }
245: # ------------------------------------------------------------------ Log status
246:
247: sub logstatus {
248: my $docdir=$perlvar{'lonDocRoot'};
249: {
250: my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
251: print $fh $$."\t".$status."\t".$lastlog."\n";
252: $fh->close();
253: }
254: {
255: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
256: print $fh $status."\n".$lastlog."\n".time;
257: $fh->close();
258: }
259: }
260:
261: sub initnewstatus {
262: my $docdir=$perlvar{'lonDocRoot'};
263: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
264: my $now=time;
265: my $local=localtime($now);
266: print $fh "LOND status $local - parent $$\n\n";
267: opendir(DIR,"$docdir/lon-status/londchld");
268: while ($filename=readdir(DIR)) {
269: unlink("$docdir/lon-status/londchld/$filename");
270: }
271: closedir(DIR);
272: }
273:
274: # -------------------------------------------------------------- Status setting
275:
276: sub status {
277: my $what=shift;
278: my $now=time;
279: my $local=localtime($now);
280: $status=$local.': '.$what;
281: }
282:
283: # -------------------------------------------------------- Escape Special Chars
284:
285: sub escape {
286: my $str=shift;
287: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
288: return $str;
289: }
290:
291: # ----------------------------------------------------- Un-Escape Special Chars
292:
293: sub unescape {
294: my $str=shift;
295: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
296: return $str;
297: }
298:
299: # ----------------------------------------------------------- Send USR1 to lonc
300:
301: sub reconlonc {
302: my $peerfile=shift;
303: &logthis("Trying to reconnect for $peerfile");
304: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
305: if (my $fh=IO::File->new("$loncfile")) {
306: my $loncpid=<$fh>;
307: chomp($loncpid);
308: if (kill 0 => $loncpid) {
309: &logthis("lonc at pid $loncpid responding, sending USR1");
310: kill USR1 => $loncpid;
311: sleep 5;
312: if (-e "$peerfile") { return; }
313: &logthis("$peerfile still not there, give it another try");
314: sleep 10;
315: if (-e "$peerfile") { return; }
316: &logthis(
317: "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
318: } else {
319: &logthis(
320: "<font color=red>CRITICAL: "
321: ."lonc at pid $loncpid not responding, giving up</font>");
322: }
323: } else {
324: &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
325: }
326: }
327:
328: # -------------------------------------------------- Non-critical communication
329:
330: sub subreply {
331: my ($cmd,$server)=@_;
332: my $peerfile="$perlvar{'lonSockDir'}/$server";
333: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
334: Type => SOCK_STREAM,
335: Timeout => 10)
336: or return "con_lost";
337: print $sclient "$cmd\n";
338: my $answer=<$sclient>;
339: chomp($answer);
340: if (!$answer) { $answer="con_lost"; }
341: return $answer;
342: }
343:
344: sub reply {
345: my ($cmd,$server)=@_;
346: my $answer;
347: if ($server ne $perlvar{'lonHostID'}) {
348: $answer=subreply($cmd,$server);
349: if ($answer eq 'con_lost') {
350: $answer=subreply("ping",$server);
351: if ($answer ne $server) {
352: &logthis("sub reply: answer != server");
353: &reconlonc("$perlvar{'lonSockDir'}/$server");
354: }
355: $answer=subreply($cmd,$server);
356: }
357: } else {
358: $answer='self_reply';
359: }
360: return $answer;
361: }
362:
363: # -------------------------------------------------------------- Talk to lonsql
364:
365: sub sqlreply {
366: my ($cmd)=@_;
367: my $answer=subsqlreply($cmd);
368: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
369: return $answer;
370: }
371:
372: sub subsqlreply {
373: my ($cmd)=@_;
374: my $unixsock="mysqlsock";
375: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
376: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
377: Type => SOCK_STREAM,
378: Timeout => 10)
379: or return "con_lost";
380: print $sclient "$cmd\n";
381: my $answer=<$sclient>;
382: chomp($answer);
383: if (!$answer) { $answer="con_lost"; }
384: return $answer;
385: }
386:
387: # -------------------------------------------- Return path to profile directory
388:
389: sub propath {
390: my ($udom,$uname)=@_;
391: $udom=~s/\W//g;
392: $uname=~s/\W//g;
393: my $subdir=$uname.'__';
394: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
395: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
396: return $proname;
397: }
398:
399: # --------------------------------------- Is this the home server of an author?
400:
401: sub ishome {
402: my $author=shift;
403: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
404: my ($udom,$uname)=split(/\//,$author);
405: my $proname=propath($udom,$uname);
406: if (-e $proname) {
407: return 'owner';
408: } else {
409: return 'not_owner';
410: }
411: }
412:
413: # ======================================================= Continue main program
414: # ---------------------------------------------------- Fork once and dissociate
415:
416: $fpid=fork;
417: exit if $fpid;
418: die "Couldn't fork: $!" unless defined ($fpid);
419:
420: POSIX::setsid() or die "Can't start new session: $!";
421:
422: # ------------------------------------------------------- Write our PID on disk
423:
424: $execdir=$perlvar{'lonDaemons'};
425: open (PIDSAVE,">$execdir/logs/lond.pid");
426: print PIDSAVE "$$\n";
427: close(PIDSAVE);
428: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
429: &status('Starting');
430:
431: # ------------------------------------------------------- Now we are on our own
432:
433: # Fork off our children.
434: for (1 .. $PREFORK) {
435: make_new_child();
436: }
437:
438: # ----------------------------------------------------- Install signal handlers
439:
440: &status('Forked children');
441:
442: $SIG{CHLD} = \&REAPER;
443: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
444: $SIG{HUP} = \&HUPSMAN;
445: $SIG{USR1} = \&checkchildren;
446:
447: # And maintain the population.
448: while (1) {
449: &status('Sleeping');
450: sleep; # wait for a signal (i.e., child's death)
451: &logthis('Woke up');
452: &status('Woke up');
453: for ($i = $children; $i < $PREFORK; $i++) {
454: make_new_child(); # top up the child pool
455: }
456: }
457:
458: sub make_new_child {
459: my $pid;
460: my $cipher;
461: my $sigset;
462: &logthis("Attempting to start child");
463: # block signal for fork
464: $sigset = POSIX::SigSet->new(SIGINT);
465: sigprocmask(SIG_BLOCK, $sigset)
466: or die "Can't block SIGINT for fork: $!\n";
467:
468: die "fork: $!" unless defined ($pid = fork);
469:
470: if ($pid) {
471: # Parent records the child's birth and returns.
472: sigprocmask(SIG_UNBLOCK, $sigset)
473: or die "Can't unblock SIGINT for fork: $!\n";
474: $children{$pid} = 1;
475: $children++;
476: &status('Started child '.$pid);
477: return;
478: } else {
479: # Child can *not* return from this subroutine.
480: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
481: $SIG{USR1}= \&logstatus;
482: $SIG{ALRM}= \&timeout;
483: $lastlog='Forked ';
484: $status='Forked';
485:
486: # unblock signals
487: sigprocmask(SIG_UNBLOCK, $sigset)
488: or die "Can't unblock SIGINT for fork: $!\n";
489:
490: $tmpsnum=0;
491: #---------------------------------------------------- kerberos 5 initialization
492: &Authen::Krb5::init_context();
493: &Authen::Krb5::init_ets();
494:
495: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
496: for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
497: &status('Idle, waiting for connection');
498: $client = $server->accept() or last;
499: &status('Accepted connection');
500: # =============================================================================
501: # do something with the connection
502: # -----------------------------------------------------------------------------
503: $client->sockopt(SO_KEEPALIVE, 1);# Enable monitoring of
504: # connection liveness.
505: # see if we know client and check for spoof IP by challenge
506: my $caller=getpeername($client);
507: my ($port,$iaddr)=unpack_sockaddr_in($caller);
508: my $clientip=inet_ntoa($iaddr);
509: my $clientrec=($hostid{$clientip} ne undef);
510: &logthis(
511: "<font color=yellow>INFO: Connection $i, $clientip ($hostid{$clientip})</font>"
512: );
513: &status("Connecting $clientip ($hostid{$clientip})");
514: my $clientok;
515: if ($clientrec) {
516: &status("Waiting for init from $clientip ($hostid{$clientip})");
517: my $remotereq=<$client>;
518: $remotereq=~s/\W//g;
519: if ($remotereq eq 'init') {
520: my $challenge="$$".time;
521: print $client "$challenge\n";
522: &status(
523: "Waiting for challenge reply from $clientip ($hostid{$clientip})");
524: $remotereq=<$client>;
525: $remotereq=~s/\W//g;
526: if ($challenge eq $remotereq) {
527: $clientok=1;
528: print $client "ok\n";
529: } else {
530: &logthis(
531: "<font color=blue>WARNING: $clientip did not reply challenge</font>");
532: &status('No challenge reply '.$clientip);
533: }
534: } else {
535: &logthis(
536: "<font color=blue>WARNING: "
537: ."$clientip failed to initialize: >$remotereq< </font>");
538: &status('No init '.$clientip);
539: }
540: } else {
541: &logthis(
542: "<font color=blue>WARNING: Unknown client $clientip</font>");
543: &status('Hung up on '.$clientip);
544: }
545: if ($clientok) {
546: # ---------------- New known client connecting, could mean machine online again
547:
548: &reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
549: &logthis(
550: "<font color=green>Established connection: $hostid{$clientip}</font>");
551: &status('Will listen to '.$hostid{$clientip});
552: # ------------------------------------------------------------ Process requests
553: while (my $userinput=<$client>) {
554: chomp($userinput);
555: Debug("Request = $userinput\n");
556: &status('Processing '.$hostid{$clientip}.': '.$userinput);
557: my $wasenc=0;
558: alarm(120);
559: # ------------------------------------------------------------ See if encrypted
560: if ($userinput =~ /^enc/) {
561: if ($cipher) {
562: my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
563: $userinput='';
564: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
565: $userinput.=
566: $cipher->decrypt(
567: pack("H16",substr($encinput,$encidx,16))
568: );
569: }
570: $userinput=substr($userinput,0,$cmdlength);
571: $wasenc=1;
572: }
573: }
574:
575: # ------------------------------------------------------------- Normal commands
576: # ------------------------------------------------------------------------ ping
577: if ($userinput =~ /^ping/) {
578: print $client "$perlvar{'lonHostID'}\n";
579: # ------------------------------------------------------------------------ pong
580: } elsif ($userinput =~ /^pong/) {
581: $reply=reply("ping",$hostid{$clientip});
582: print $client "$perlvar{'lonHostID'}:$reply\n";
583: # ------------------------------------------------------------------------ ekey
584: } elsif ($userinput =~ /^ekey/) {
585: my $buildkey=time.$$.int(rand 100000);
586: $buildkey=~tr/1-6/A-F/;
587: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
588: my $key=$perlvar{'lonHostID'}.$hostid{$clientip};
589: $key=~tr/a-z/A-Z/;
590: $key=~tr/G-P/0-9/;
591: $key=~tr/Q-Z/0-9/;
592: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
593: $key=substr($key,0,32);
594: my $cipherkey=pack("H32",$key);
595: $cipher=new IDEA $cipherkey;
596: print $client "$buildkey\n";
597: # ------------------------------------------------------------------------ load
598: } elsif ($userinput =~ /^load/) {
599: my $loadavg;
600: {
601: my $loadfile=IO::File->new('/proc/loadavg');
602: $loadavg=<$loadfile>;
603: }
604: $loadavg =~ s/\s.*//g;
605: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
606: print $client "$loadpercent\n";
607: # ----------------------------------------------------------------- currentauth
608: } elsif ($userinput =~ /^currentauth/) {
609: if ($wasenc==1) {
610: my ($cmd,$udom,$uname)=split(/:/,$userinput);
611: my $result = GetAuthType($udom, $uname);
612: if($result eq "nouser") {
613: print $client "unknown_user\n";
614: }
615: else {
616: print $client "$result\n"
617: }
618: } else {
619: print $client "refused\n";
620: }
621: # ------------------------------------------------------------------------ auth
622: } elsif ($userinput =~ /^auth/) {
623: if ($wasenc==1) {
624: my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
625: chomp($upass);
626: $upass=unescape($upass);
627: my $proname=propath($udom,$uname);
628: my $passfilename="$proname/passwd";
629: if (-e $passfilename) {
630: my $pf = IO::File->new($passfilename);
631: my $realpasswd=<$pf>;
632: chomp($realpasswd);
633: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
634: my $pwdcorrect=0;
635: if ($howpwd eq 'internal') {
636: $pwdcorrect=
637: (crypt($upass,$contentpwd) eq $contentpwd);
638: } elsif ($howpwd eq 'unix') {
639: $contentpwd=(getpwnam($uname))[1];
640: my $pwauth_path="/usr/local/sbin/pwauth";
641: unless ($contentpwd eq 'x') {
642: $pwdcorrect=
643: (crypt($upass,$contentpwd) eq $contentpwd);
644: }
645: elsif (-e $pwauth_path) {
646: open PWAUTH, "|$pwauth_path" or
647: die "Cannot invoke authentication";
648: print PWAUTH "$uname\n$upass\n";
649: close PWAUTH;
650: $pwdcorrect=!$?;
651: }
652: } elsif ($howpwd eq 'krb4') {
653: $null=pack("C",0);
654: unless ($upass=~/$null/) {
655: $pwdcorrect=(
656: Authen::Krb4::get_pw_in_tkt($uname,"",
657: $contentpwd,'krbtgt',$contentpwd,1,
658: $upass) == 0);
659: } else { $pwdcorrect=0; }
660: } elsif ($howpwd eq 'krb5') {
661: $null=pack("C",0);
662: unless ($upass=~/$null/) {
663: my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
664: my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
665: my $krbserver=&Authen::Krb5::parse_name($krbservice);
666: my $credentials=&Authen::Krb5::cc_default();
667: $credentials->initialize($krbclient);
668: my $krbreturn =
669: &Authen::Krb5::get_in_tkt_with_password(
670: $krbclient,$krbserver,$upass,$credentials);
671: # unless ($krbreturn) {
672: # &logthis("Krb5 Error: ".
673: # &Authen::Krb5::error());
674: # }
675: $pwdcorrect = ($krbreturn == 1);
676: } else { $pwdcorrect=0; }
677: } elsif ($howpwd eq 'localauth') {
678: $pwdcorrect=&localauth::localauth($uname,$upass,
679: $contentpwd);
680: }
681: if ($pwdcorrect) {
682: print $client "authorized\n";
683: } else {
684: print $client "non_authorized\n";
685: }
686: } else {
687: print $client "unknown_user\n";
688: }
689: } else {
690: print $client "refused\n";
691: }
692: # ---------------------------------------------------------------------- passwd
693: } elsif ($userinput =~ /^passwd/) {
694: if ($wasenc==1) {
695: my
696: ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
697: chomp($npass);
698: $upass=&unescape($upass);
699: $npass=&unescape($npass);
700: &logthis("Trying to change password for $uname");
701: my $proname=propath($udom,$uname);
702: my $passfilename="$proname/passwd";
703: if (-e $passfilename) {
704: my $realpasswd;
705: { my $pf = IO::File->new($passfilename);
706: $realpasswd=<$pf>; }
707: chomp($realpasswd);
708: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
709: if ($howpwd eq 'internal') {
710: if (crypt($upass,$contentpwd) eq $contentpwd) {
711: my $salt=time;
712: $salt=substr($salt,6,2);
713: my $ncpass=crypt($npass,$salt);
714: { my $pf = IO::File->new(">$passfilename");
715: print $pf "internal:$ncpass\n"; }
716: &logthis("Result of password change for $uname: pwchange_success");
717: print $client "ok\n";
718: } else {
719: print $client "non_authorized\n";
720: }
721: } elsif ($howpwd eq 'unix') {
722: # Unix means we have to access /etc/password
723: # one way or another.
724: # First: Make sure the current password is
725: # correct
726: $contentpwd=(getpwnam($uname))[1];
727: my $pwdcorrect = "0";
728: my $pwauth_path="/usr/local/sbin/pwauth";
729: unless ($contentpwd eq 'x') {
730: $pwdcorrect=
731: (crypt($upass,$contentpwd) eq $contentpwd);
732: } elsif (-e $pwauth_path) {
733: open PWAUTH, "|$pwauth_path" or
734: die "Cannot invoke authentication";
735: print PWAUTH "$uname\n$upass\n";
736: close PWAUTH;
737: $pwdcorrect=!$?;
738: }
739: if ($pwdcorrect) {
740: my $execdir=$perlvar{'lonDaemons'};
741: my $pf = IO::File->new("|$execdir/lcpasswd");
742: print $pf "$uname\n$npass\n$npass\n";
743: close $pf;
744: my $result = ($?>0 ? 'pwchange_failure'
745: : 'ok');
746: &logthis("Result of password change for $uname: $result");
747: print $client "$result\n";
748: } else {
749: print $client "non_authorized\n";
750: }
751: } else {
752: print $client "auth_mode_error\n";
753: }
754: } else {
755: print $client "unknown_user\n";
756: }
757: } else {
758: print $client "refused\n";
759: }
760: # -------------------------------------------------------------------- makeuser
761: } elsif ($userinput =~ /^makeuser/) {
762: &Debug("Make user received");
763: my $oldumask=umask(0077);
764: if ($wasenc==1) {
765: my
766: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
767: &Debug("cmd =".$cmd." $udom =".$udom.
768: " uname=".$uname);
769: chomp($npass);
770: $npass=&unescape($npass);
771: my $proname=propath($udom,$uname);
772: my $passfilename="$proname/passwd";
773: &Debug("Password file created will be:".
774: $passfilename);
775: if (-e $passfilename) {
776: print $client "already_exists\n";
777: } elsif ($udom ne $perlvar{'lonDefDomain'}) {
778: print $client "not_right_domain\n";
779: } else {
780: @fpparts=split(/\//,$proname);
781: $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
782: $fperror='';
783: for ($i=3;$i<=$#fpparts;$i++) {
784: $fpnow.='/'.$fpparts[$i];
785: unless (-e $fpnow) {
786: unless (mkdir($fpnow,0777)) {
787: $fperror="error:$!";
788: }
789: }
790: }
791: unless ($fperror) {
792: my $result=&make_passwd_file($umode,$npass,
793: $passfilename);
794: print $client $result;
795: } else {
796: print $client "$fperror\n";
797: }
798: }
799: } else {
800: print $client "refused\n";
801: }
802: umask($oldumask);
803: # -------------------------------------------------------------- changeuserauth
804: } elsif ($userinput =~ /^changeuserauth/) {
805: &Debug("Changing authorization");
806: if ($wasenc==1) {
807: my
808: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
809: chomp($npass);
810: &Debug("cmd = ".$cmd." domain= ".$udom.
811: "uname =".$uname." umode= ".$umode);
812: $npass=&unescape($npass);
813: my $proname=&propath($udom,$uname);
814: my $passfilename="$proname/passwd";
815: if ($udom ne $perlvar{'lonDefDomain'}) {
816: print $client "not_right_domain\n";
817: } else {
818: my $result=&make_passwd_file($umode,$npass,
819: $passfilename);
820: print $client $result;
821: }
822: } else {
823: print $client "refused\n";
824: }
825: # ------------------------------------------------------------------------ home
826: } elsif ($userinput =~ /^home/) {
827: my ($cmd,$udom,$uname)=split(/:/,$userinput);
828: chomp($uname);
829: my $proname=propath($udom,$uname);
830: if (-e $proname) {
831: print $client "found\n";
832: } else {
833: print $client "not_found\n";
834: }
835: # ---------------------------------------------------------------------- update
836: } elsif ($userinput =~ /^update/) {
837: my ($cmd,$fname)=split(/:/,$userinput);
838: my $ownership=ishome($fname);
839: if ($ownership eq 'not_owner') {
840: if (-e $fname) {
841: my ($dev,$ino,$mode,$nlink,
842: $uid,$gid,$rdev,$size,
843: $atime,$mtime,$ctime,
844: $blksize,$blocks)=stat($fname);
845: $now=time;
846: $since=$now-$atime;
847: if ($since>$perlvar{'lonExpire'}) {
848: $reply=
849: reply("unsub:$fname","$hostid{$clientip}");
850: unlink("$fname");
851: } else {
852: my $transname="$fname.in.transfer";
853: my $remoteurl=
854: reply("sub:$fname","$hostid{$clientip}");
855: my $response;
856: {
857: my $ua=new LWP::UserAgent;
858: my $request=new HTTP::Request('GET',"$remoteurl");
859: $response=$ua->request($request,$transname);
860: }
861: if ($response->is_error()) {
862: unlink($transname);
863: my $message=$response->status_line;
864: &logthis(
865: "LWP GET: $message for $fname ($remoteurl)");
866: } else {
867: if ($remoteurl!~/\.meta$/) {
868: my $ua=new LWP::UserAgent;
869: my $mrequest=
870: new HTTP::Request('GET',$remoteurl.'.meta');
871: my $mresponse=
872: $ua->request($mrequest,$fname.'.meta');
873: if ($mresponse->is_error()) {
874: unlink($fname.'.meta');
875: }
876: }
877: rename($transname,$fname);
878: }
879: }
880: print $client "ok\n";
881: } else {
882: print $client "not_found\n";
883: }
884: } else {
885: print $client "rejected\n";
886: }
887: # -------------------------------------- fetch a user file from a remote server
888: } elsif ($userinput =~ /^fetchuserfile/) {
889: my ($cmd,$fname)=split(/:/,$userinput);
890: my ($udom,$uname,$ufile)=split(/\//,$fname);
891: my $udir=propath($udom,$uname).'/userfiles';
892: unless (-e $udir) { mkdir($udir,0770); }
893: if (-e $udir) {
894: $ufile=~s/^[\.\~]+//;
895: $ufile=~s/\///g;
896: my $transname=$udir.'/'.$ufile;
897: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
898: my $response;
899: {
900: my $ua=new LWP::UserAgent;
901: my $request=new HTTP::Request('GET',"$remoteurl");
902: $response=$ua->request($request,$transname);
903: }
904: if ($response->is_error()) {
905: unlink($transname);
906: my $message=$response->status_line;
907: &logthis(
908: "LWP GET: $message for $fname ($remoteurl)");
909: print $client "failed\n";
910: } else {
911: print $client "ok\n";
912: }
913: } else {
914: print $client "not_home\n";
915: }
916: # ------------------------------------------ authenticate access to a user file
917: } elsif ($userinput =~ /^tokenauthuserfile/) {
918: my ($cmd,$fname,$session)=split(/:/,$userinput);
919: chomp($session);
920: $reply='non_auth';
921: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
922: $session.'.id')) {
923: while ($line=<ENVIN>) {
924: if ($line=~/userfile\.$fname\=/) { $reply='ok'; }
925: }
926: close(ENVIN);
927: print $client $reply."\n";
928: } else {
929: print $client "invalid_token\n";
930: }
931: # ----------------------------------------------------------------- unsubscribe
932: } elsif ($userinput =~ /^unsub/) {
933: my ($cmd,$fname)=split(/:/,$userinput);
934: if (-e $fname) {
935: print $client &unsub($client,$fname,$clientip);
936: } else {
937: print $client "not_found\n";
938: }
939: # ------------------------------------------------------------------- subscribe
940: } elsif ($userinput =~ /^sub/) {
941: print $client &subscribe($userinput,$clientip);
942: # ------------------------------------------------------------------------- log
943: } elsif ($userinput =~ /^log/) {
944: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
945: chomp($what);
946: my $proname=propath($udom,$uname);
947: my $now=time;
948: {
949: my $hfh;
950: if ($hfh=IO::File->new(">>$proname/activity.log")) {
951: print $hfh "$now:$hostid{$clientip}:$what\n";
952: print $client "ok\n";
953: } else {
954: print $client "error:$!\n";
955: }
956: }
957: # ------------------------------------------------------------------------- put
958: } elsif ($userinput =~ /^put/) {
959: my ($cmd,$udom,$uname,$namespace,$what)
960: =split(/:/,$userinput);
961: $namespace=~s/\//\_/g;
962: $namespace=~s/\W//g;
963: if ($namespace ne 'roles') {
964: chomp($what);
965: my $proname=propath($udom,$uname);
966: my $now=time;
967: unless ($namespace=~/^nohist\_/) {
968: my $hfh;
969: if (
970: $hfh=IO::File->new(">>$proname/$namespace.hist")
971: ) { print $hfh "P:$now:$what\n"; }
972: }
973: my @pairs=split(/\&/,$what);
974: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
975: foreach $pair (@pairs) {
976: ($key,$value)=split(/=/,$pair);
977: $hash{$key}=$value;
978: }
979: if (untie(%hash)) {
980: print $client "ok\n";
981: } else {
982: print $client "error:$!\n";
983: }
984: } else {
985: print $client "error:$!\n";
986: }
987: } else {
988: print $client "refused\n";
989: }
990: # -------------------------------------------------------------------- rolesput
991: } elsif ($userinput =~ /^rolesput/) {
992: &Debug("rolesput");
993: if ($wasenc==1) {
994: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
995: =split(/:/,$userinput);
996: &Debug("cmd = ".$cmd." exedom= ".$exedom.
997: "user = ".$exeuser." udom=".$udom.
998: "what = ".$what);
999: my $namespace='roles';
1000: chomp($what);
1001: my $proname=propath($udom,$uname);
1002: my $now=time;
1003: {
1004: my $hfh;
1005: if (
1006: $hfh=IO::File->new(">>$proname/$namespace.hist")
1007: ) {
1008: print $hfh "P:$now:$exedom:$exeuser:$what\n";
1009: }
1010: }
1011: my @pairs=split(/\&/,$what);
1012: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1013: foreach $pair (@pairs) {
1014: ($key,$value)=split(/=/,$pair);
1015: &ManagePermissions($key, $udom, $uname,
1016: &GetAuthType( $udom,
1017: $uname));
1018: $hash{$key}=$value;
1019:
1020: }
1021: if (untie(%hash)) {
1022: print $client "ok\n";
1023: } else {
1024: print $client "error:$!\n";
1025: }
1026: } else {
1027: print $client "error:$!\n";
1028: }
1029: } else {
1030: print $client "refused\n";
1031: }
1032: # ------------------------------------------------------------------------- get
1033: } elsif ($userinput =~ /^get/) {
1034: my ($cmd,$udom,$uname,$namespace,$what)
1035: =split(/:/,$userinput);
1036: $namespace=~s/\//\_/g;
1037: $namespace=~s/\W//g;
1038: chomp($what);
1039: my @queries=split(/\&/,$what);
1040: my $proname=propath($udom,$uname);
1041: my $qresult='';
1042: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1043: for ($i=0;$i<=$#queries;$i++) {
1044: $qresult.="$hash{$queries[$i]}&";
1045: }
1046: if (untie(%hash)) {
1047: $qresult=~s/\&$//;
1048: print $client "$qresult\n";
1049: } else {
1050: print $client "error:$!\n";
1051: }
1052: } else {
1053: print $client "error:$!\n";
1054: }
1055: # ------------------------------------------------------------------------ eget
1056: } elsif ($userinput =~ /^eget/) {
1057: my ($cmd,$udom,$uname,$namespace,$what)
1058: =split(/:/,$userinput);
1059: $namespace=~s/\//\_/g;
1060: $namespace=~s/\W//g;
1061: chomp($what);
1062: my @queries=split(/\&/,$what);
1063: my $proname=propath($udom,$uname);
1064: my $qresult='';
1065: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1066: for ($i=0;$i<=$#queries;$i++) {
1067: $qresult.="$hash{$queries[$i]}&";
1068: }
1069: if (untie(%hash)) {
1070: $qresult=~s/\&$//;
1071: if ($cipher) {
1072: my $cmdlength=length($qresult);
1073: $qresult.=" ";
1074: my $encqresult='';
1075: for
1076: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
1077: $encqresult.=
1078: unpack("H16",
1079: $cipher->encrypt(substr($qresult,$encidx,8)));
1080: }
1081: print $client "enc:$cmdlength:$encqresult\n";
1082: } else {
1083: print $client "error:no_key\n";
1084: }
1085: } else {
1086: print $client "error:$!\n";
1087: }
1088: } else {
1089: print $client "error:$!\n";
1090: }
1091: # ------------------------------------------------------------------------- del
1092: } elsif ($userinput =~ /^del/) {
1093: my ($cmd,$udom,$uname,$namespace,$what)
1094: =split(/:/,$userinput);
1095: $namespace=~s/\//\_/g;
1096: $namespace=~s/\W//g;
1097: chomp($what);
1098: my $proname=propath($udom,$uname);
1099: my $now=time;
1100: unless ($namespace=~/^nohist\_/) {
1101: my $hfh;
1102: if (
1103: $hfh=IO::File->new(">>$proname/$namespace.hist")
1104: ) { print $hfh "D:$now:$what\n"; }
1105: }
1106: my @keys=split(/\&/,$what);
1107: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1108: foreach $key (@keys) {
1109: delete($hash{$key});
1110: }
1111: if (untie(%hash)) {
1112: print $client "ok\n";
1113: } else {
1114: print $client "error:$!\n";
1115: }
1116: } else {
1117: print $client "error:$!\n";
1118: }
1119: # ------------------------------------------------------------------------ keys
1120: } elsif ($userinput =~ /^keys/) {
1121: my ($cmd,$udom,$uname,$namespace)
1122: =split(/:/,$userinput);
1123: $namespace=~s/\//\_/g;
1124: $namespace=~s/\W//g;
1125: my $proname=propath($udom,$uname);
1126: my $qresult='';
1127: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1128: foreach $key (keys %hash) {
1129: $qresult.="$key&";
1130: }
1131: if (untie(%hash)) {
1132: $qresult=~s/\&$//;
1133: print $client "$qresult\n";
1134: } else {
1135: print $client "error:$!\n";
1136: }
1137: } else {
1138: print $client "error:$!\n";
1139: }
1140: # ------------------------------------------------------------------------ dump
1141: } elsif ($userinput =~ /^dump/) {
1142: my ($cmd,$udom,$uname,$namespace,$regexp)
1143: =split(/:/,$userinput);
1144: $namespace=~s/\//\_/g;
1145: $namespace=~s/\W//g;
1146: if (defined($regexp)) {
1147: $regexp=&unescape($regexp);
1148: } else {
1149: $regexp='.';
1150: }
1151: my $proname=propath($udom,$uname);
1152: my $qresult='';
1153: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1154: study($regexp);
1155: foreach $key (keys %hash) {
1156: my $unescapeKey = &unescape($key);
1157: if (eval('$unescapeKey=~/$regexp/')) {
1158: $qresult.="$key=$hash{$key}&";
1159: }
1160: }
1161: if (untie(%hash)) {
1162: $qresult=~s/\&$//;
1163: print $client "$qresult\n";
1164: } else {
1165: print $client "error:$!\n";
1166: }
1167: } else {
1168: print $client "error:$!\n";
1169: }
1170: # ----------------------------------------------------------------------- store
1171: } elsif ($userinput =~ /^store/) {
1172: my ($cmd,$udom,$uname,$namespace,$rid,$what)
1173: =split(/:/,$userinput);
1174: $namespace=~s/\//\_/g;
1175: $namespace=~s/\W//g;
1176: if ($namespace ne 'roles') {
1177: chomp($what);
1178: my $proname=propath($udom,$uname);
1179: my $now=time;
1180: unless ($namespace=~/^nohist\_/) {
1181: my $hfh;
1182: if (
1183: $hfh=IO::File->new(">>$proname/$namespace.hist")
1184: ) { print $hfh "P:$now:$rid:$what\n"; }
1185: }
1186: my @pairs=split(/\&/,$what);
1187:
1188: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1189: my @previouskeys=split(/&/,$hash{"keys:$rid"});
1190: my $key;
1191: $hash{"version:$rid"}++;
1192: my $version=$hash{"version:$rid"};
1193: my $allkeys='';
1194: foreach $pair (@pairs) {
1195: ($key,$value)=split(/=/,$pair);
1196: $allkeys.=$key.':';
1197: $hash{"$version:$rid:$key"}=$value;
1198: }
1199: $hash{"$version:$rid:timestamp"}=$now;
1200: $allkeys.='timestamp';
1201: $hash{"$version:keys:$rid"}=$allkeys;
1202: if (untie(%hash)) {
1203: print $client "ok\n";
1204: } else {
1205: print $client "error:$!\n";
1206: }
1207: } else {
1208: print $client "error:$!\n";
1209: }
1210: } else {
1211: print $client "refused\n";
1212: }
1213: # --------------------------------------------------------------------- restore
1214: } elsif ($userinput =~ /^restore/) {
1215: my ($cmd,$udom,$uname,$namespace,$rid)
1216: =split(/:/,$userinput);
1217: $namespace=~s/\//\_/g;
1218: $namespace=~s/\W//g;
1219: chomp($rid);
1220: my $proname=propath($udom,$uname);
1221: my $qresult='';
1222: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1223: my $version=$hash{"version:$rid"};
1224: $qresult.="version=$version&";
1225: my $scope;
1226: for ($scope=1;$scope<=$version;$scope++) {
1227: my $vkeys=$hash{"$scope:keys:$rid"};
1228: my @keys=split(/:/,$vkeys);
1229: my $key;
1230: $qresult.="$scope:keys=$vkeys&";
1231: foreach $key (@keys) {
1232: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
1233: }
1234: }
1235: if (untie(%hash)) {
1236: $qresult=~s/\&$//;
1237: print $client "$qresult\n";
1238: } else {
1239: print $client "error:$!\n";
1240: }
1241: } else {
1242: print $client "error:$!\n";
1243: }
1244: # -------------------------------------------------------------------- chatsend
1245: } elsif ($userinput =~ /^chatsend/) {
1246: my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
1247: &chatadd($cdom,$cnum,$newpost);
1248: print $client "ok\n";
1249: # -------------------------------------------------------------------- chatretr
1250: } elsif ($userinput =~ /^chatretr/) {
1251: my ($cmd,$cdom,$cnum)=split(/\:/,$userinput);
1252: my $reply='';
1253: foreach (&getchat($cdom,$cnum)) {
1254: $reply.=&escape($_).':';
1255: }
1256: $reply=~s/\:$//;
1257: print $client $reply."\n";
1258: # ------------------------------------------------------------------- querysend
1259: } elsif ($userinput =~ /^querysend/) {
1260: my ($cmd,$query,
1261: $arg1,$arg2,$arg3)=split(/\:/,$userinput);
1262: $query=~s/\n*$//g;
1263: print $client "".
1264: sqlreply("$hostid{$clientip}\&$query".
1265: "\&$arg1"."\&$arg2"."\&$arg3")."\n";
1266: # ------------------------------------------------------------------ queryreply
1267: } elsif ($userinput =~ /^queryreply/) {
1268: my ($cmd,$id,$reply)=split(/:/,$userinput);
1269: my $store;
1270: my $execdir=$perlvar{'lonDaemons'};
1271: if ($store=IO::File->new(">$execdir/tmp/$id")) {
1272: $reply=~s/\&/\n/g;
1273: print $store $reply;
1274: close $store;
1275: my $store2=IO::File->new(">$execdir/tmp/$id.end");
1276: print $store2 "done\n";
1277: close $store2;
1278: print $client "ok\n";
1279: }
1280: else {
1281: print $client "error:$!\n";
1282: }
1283: # ----------------------------------------------------------------------- idput
1284: } elsif ($userinput =~ /^idput/) {
1285: my ($cmd,$udom,$what)=split(/:/,$userinput);
1286: chomp($what);
1287: $udom=~s/\W//g;
1288: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1289: my $now=time;
1290: {
1291: my $hfh;
1292: if (
1293: $hfh=IO::File->new(">>$proname.hist")
1294: ) { print $hfh "P:$now:$what\n"; }
1295: }
1296: my @pairs=split(/\&/,$what);
1297: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT,0640)) {
1298: foreach $pair (@pairs) {
1299: ($key,$value)=split(/=/,$pair);
1300: $hash{$key}=$value;
1301: }
1302: if (untie(%hash)) {
1303: print $client "ok\n";
1304: } else {
1305: print $client "error:$!\n";
1306: }
1307: } else {
1308: print $client "error:$!\n";
1309: }
1310: # ----------------------------------------------------------------------- idget
1311: } elsif ($userinput =~ /^idget/) {
1312: my ($cmd,$udom,$what)=split(/:/,$userinput);
1313: chomp($what);
1314: $udom=~s/\W//g;
1315: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1316: my @queries=split(/\&/,$what);
1317: my $qresult='';
1318: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER,0640)) {
1319: for ($i=0;$i<=$#queries;$i++) {
1320: $qresult.="$hash{$queries[$i]}&";
1321: }
1322: if (untie(%hash)) {
1323: $qresult=~s/\&$//;
1324: print $client "$qresult\n";
1325: } else {
1326: print $client "error:$!\n";
1327: }
1328: } else {
1329: print $client "error:$!\n";
1330: }
1331: # ---------------------------------------------------------------------- tmpput
1332: } elsif ($userinput =~ /^tmpput/) {
1333: my ($cmd,$what)=split(/:/,$userinput);
1334: my $store;
1335: $tmpsnum++;
1336: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
1337: $id=~s/\W/\_/g;
1338: $what=~s/\n//g;
1339: my $execdir=$perlvar{'lonDaemons'};
1340: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
1341: print $store $what;
1342: close $store;
1343: print $client "$id\n";
1344: }
1345: else {
1346: print $client "error:$!\n";
1347: }
1348:
1349: # ---------------------------------------------------------------------- tmpget
1350: } elsif ($userinput =~ /^tmpget/) {
1351: my ($cmd,$id)=split(/:/,$userinput);
1352: chomp($id);
1353: $id=~s/\W/\_/g;
1354: my $store;
1355: my $execdir=$perlvar{'lonDaemons'};
1356: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
1357: my $reply=<$store>;
1358: print $client "$reply\n";
1359: close $store;
1360: }
1361: else {
1362: print $client "error:$!\n";
1363: }
1364:
1365: # -------------------------------------------------------------------------- ls
1366: } elsif ($userinput =~ /^ls/) {
1367: my ($cmd,$ulsdir)=split(/:/,$userinput);
1368: my $ulsout='';
1369: my $ulsfn;
1370: if (-e $ulsdir) {
1371: if(-d $ulsdir) {
1372: if (opendir(LSDIR,$ulsdir)) {
1373: while ($ulsfn=readdir(LSDIR)) {
1374: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1375: $ulsout.=$ulsfn.'&'.
1376: join('&',@ulsstats).':';
1377: }
1378: closedir(LSDIR);
1379: }
1380: } else {
1381: my @ulsstats=stat($ulsdir);
1382: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1383: }
1384: } else {
1385: $ulsout='no_such_dir';
1386: }
1387: if ($ulsout eq '') { $ulsout='empty'; }
1388: print $client "$ulsout\n";
1389: # ------------------------------------------------------------------ Hanging up
1390: } elsif (($userinput =~ /^exit/) ||
1391: ($userinput =~ /^init/)) {
1392: &logthis(
1393: "Client $clientip ($hostid{$clientip}) hanging up: $userinput");
1394: print $client "bye\n";
1395: $client->close();
1396: last;
1397: # ------------------------------------------------------------- unknown command
1398: } else {
1399: # unknown command
1400: print $client "unknown_cmd\n";
1401: }
1402: # -------------------------------------------------------------------- complete
1403: alarm(0);
1404: &status('Listening to '.$hostid{$clientip});
1405: }
1406: # --------------------------------------------- client unknown or fishy, refuse
1407: } else {
1408: print $client "refused\n";
1409: $client->close();
1410: &logthis("<font color=blue>WARNING: "
1411: ."Rejected client $clientip, closing connection</font>");
1412: }
1413: }
1414:
1415: # =============================================================================
1416:
1417: &logthis("<font color=red>CRITICAL: "
1418: ."Disconnect from $clientip ($hostid{$clientip})</font>");
1419: # tidy up gracefully and finish
1420:
1421: $server->close();
1422:
1423: # this exit is VERY important, otherwise the child will become
1424: # a producer of more and more children, forking yourself into
1425: # process death.
1426: exit;
1427: }
1428: }
1429:
1430:
1431: #
1432: # Checks to see if the input roleput request was to set
1433: # an author role. If so, invokes the lchtmldir script to set
1434: # up a correct public_html
1435: # Parameters:
1436: # request - The request sent to the rolesput subchunk.
1437: # We're looking for /domain/_au
1438: # domain - The domain in which the user is having roles doctored.
1439: # user - Name of the user for which the role is being put.
1440: # authtype - The authentication type associated with the user.
1441: #
1442: sub ManagePermissions
1443: {
1444: my $request = shift;
1445: my $domain = shift;
1446: my $user = shift;
1447: my $authtype= shift;
1448:
1449: # See if the request is of the form /$domain/_au
1450:
1451: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
1452: my $execdir = $perlvar{'lonDaemons'};
1453: my $userhome= "/home/$user" ;
1454: Debug("system $execdir/lchtmldir $userhome $system $authtype");
1455: system("$execdir/lchtmldir $userhome $user $authtype");
1456: }
1457: }
1458: #
1459: # GetAuthType - Determines the authorization type of a user in a domain.
1460:
1461: # Returns the authorization type or nouser if there is no such user.
1462: #
1463: sub GetAuthType
1464: {
1465: my $domain = shift;
1466: my $user = shift;
1467:
1468: Debug("GetAuthType( $domain, $user ) \n");
1469: my $proname = &propath($domain, $user);
1470: my $passwdfile = "$proname/passwd";
1471: if( -e $passwdfile ) {
1472: my $pf = IO::File->new($passwdfile);
1473: my $realpassword = <$pf>;
1474: chomp($realpassword);
1475: Debug("Password info = $realpassword\n");
1476: my ($authtype, $contentpwd) = split(/:/, $realpassword);
1477: Debug("Authtype = $authtype, content = $contentpwd\n");
1478: my $availinfo = '';
1479: if($authtype eq 'krb4' or $authtype eq 'krb5') {
1480: $availinfo = $contentpwd;
1481: }
1482:
1483: return "$authtype:$availinfo";
1484: }
1485: else {
1486: Debug("Returning nouser");
1487: return "nouser";
1488: }
1489: }
1490:
1491: sub addline {
1492: my ($fname,$hostid,$ip,$newline)=@_;
1493: my $contents;
1494: my $found=0;
1495: my $expr='^'.$hostid.':'.$ip.':';
1496: $expr =~ s/\./\\\./g;
1497: if ($sh=IO::File->new("$fname.subscription")) {
1498: while (my $subline=<$sh>) {
1499: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
1500: }
1501: $sh->close();
1502: }
1503: $sh=IO::File->new(">$fname.subscription");
1504: if ($contents) { print $sh $contents; }
1505: if ($newline) { print $sh $newline; }
1506: $sh->close();
1507: return $found;
1508: }
1509:
1510: sub getchat {
1511: my ($cdom,$cname)=@_;
1512: my %hash;
1513: my $proname=&propath($cdom,$cname);
1514: my @entries=();
1515: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
1516: &GDBM_READER(),0640)) {
1517: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
1518: untie %hash;
1519: }
1520: return @entries;
1521: }
1522:
1523: sub chatadd {
1524: my ($cdom,$cname,$newchat)=@_;
1525: my %hash;
1526: my $proname=&propath($cdom,$cname);
1527: my @entries=();
1528: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
1529: &GDBM_WRCREAT(),0640)) {
1530: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
1531: my $time=time;
1532: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
1533: my ($thentime,$idnum)=split(/\_/,$lastid);
1534: my $newid=$time.'_000000';
1535: if ($thentime==$time) {
1536: $idnum=~s/^0+//;
1537: $idnum++;
1538: $idnum=substr('000000'.$idnum,-6,6);
1539: $newid=$time.'_'.$idnum;
1540: }
1541: $hash{$newid}=$newchat;
1542: my $expired=$time-3600;
1543: foreach (keys %hash) {
1544: my ($thistime)=($_=~/(\d+)\_/);
1545: if ($thistime<$expired) {
1546: delete $hash{$_};
1547: }
1548: }
1549: untie %hash;
1550: }
1551: }
1552:
1553: sub unsub {
1554: my ($fname,$clientip)=@_;
1555: my $result;
1556: if (unlink("$fname.$hostid{$clientip}")) {
1557: $result="ok\n";
1558: } else {
1559: $result="not_subscribed\n";
1560: }
1561: if (-e "$fname.subscription") {
1562: my $found=&addline($fname,$hostid{$clientip},$clientip,'');
1563: if ($found) { $result="ok\n"; }
1564: } else {
1565: if ($result != "ok\n") { $result="not_subscribed\n"; }
1566: }
1567: return $result;
1568: }
1569:
1570: sub subscribe {
1571: my ($userinput,$clientip)=@_;
1572: my $result;
1573: my ($cmd,$fname)=split(/:/,$userinput);
1574: my $ownership=&ishome($fname);
1575: if ($ownership eq 'owner') {
1576: if (-e $fname) {
1577: if (-d $fname) {
1578: $result="directory\n";
1579: } else {
1580: if (-e "$fname.$hostid{$clientip}") {&unsub($fname,$clientip);}
1581: $now=time;
1582: my $found=&addline($fname,$hostid{$clientip},$clientip,
1583: "$hostid{$clientip}:$clientip:$now\n");
1584: if ($found) { $result="$fname\n"; }
1585: # if they were subscribed to only meta data, delete that
1586: # subscription, when you subscribe to a file you also get
1587: # the metadata
1588: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
1589: $fname=~s/\/home\/httpd\/html\/res/raw/;
1590: $fname="http://$thisserver/".$fname;
1591: $result="$fname\n";
1592: }
1593: } else {
1594: $result="not_found\n";
1595: }
1596: } else {
1597: $result="rejected\n";
1598: }
1599: return $result;
1600: }
1601:
1602: sub make_passwd_file {
1603: my ($umode,$npass,$passfilename)=@_;
1604: my $result="ok\n";
1605: if ($umode eq 'krb4' or $umode eq 'krb5') {
1606: {
1607: my $pf = IO::File->new(">$passfilename");
1608: print $pf "$umode:$npass\n";
1609: }
1610: } elsif ($umode eq 'internal') {
1611: my $salt=time;
1612: $salt=substr($salt,6,2);
1613: my $ncpass=crypt($npass,$salt);
1614: {
1615: &Debug("Creating internal auth");
1616: my $pf = IO::File->new(">$passfilename");
1617: print $pf "internal:$ncpass\n";
1618: }
1619: } elsif ($umode eq 'localauth') {
1620: {
1621: my $pf = IO::File->new(">$passfilename");
1622: print $pf "localauth:$npass\n";
1623: }
1624: } elsif ($umode eq 'unix') {
1625: {
1626: my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
1627: {
1628: &Debug("Executing external: ".$execpath);
1629: my $se = IO::File->new("|$execpath");
1630: print $se "$uname\n";
1631: print $se "$npass\n";
1632: print $se "$npass\n";
1633: }
1634: my $pf = IO::File->new(">$passfilename");
1635: print $pf "unix:\n";
1636: }
1637: } elsif ($umode eq 'none') {
1638: {
1639: my $pf = IO::File->new(">$passfilename");
1640: print $pf "none:\n";
1641: }
1642: } else {
1643: $result="auth_mode_error\n";
1644: }
1645: return $result;
1646: }
1647:
1648: # ----------------------------------- POD (plain old documentation, CPAN style)
1649:
1650: =head1 NAME
1651:
1652: lond - "LON Daemon" Server (port "LOND" 5663)
1653:
1654: =head1 SYNOPSIS
1655:
1656: Usage: B<lond>
1657:
1658: Should only be run as user=www. This is a command-line script which
1659: is invoked by B<loncron>. There is no expectation that a typical user
1660: will manually start B<lond> from the command-line. (In other words,
1661: DO NOT START B<lond> YOURSELF.)
1662:
1663: =head1 DESCRIPTION
1664:
1665: There are two characteristics associated with the running of B<lond>,
1666: PROCESS MANAGEMENT (starting, stopping, handling child processes)
1667: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
1668: subscriptions, etc). These are described in two large
1669: sections below.
1670:
1671: B<PROCESS MANAGEMENT>
1672:
1673: Preforker - server who forks first. Runs as a daemon. HUPs.
1674: Uses IDEA encryption
1675:
1676: B<lond> forks off children processes that correspond to the other servers
1677: in the network. Management of these processes can be done at the
1678: parent process level or the child process level.
1679:
1680: B<logs/lond.log> is the location of log messages.
1681:
1682: The process management is now explained in terms of linux shell commands,
1683: subroutines internal to this code, and signal assignments:
1684:
1685: =over 4
1686:
1687: =item *
1688:
1689: PID is stored in B<logs/lond.pid>
1690:
1691: This is the process id number of the parent B<lond> process.
1692:
1693: =item *
1694:
1695: SIGTERM and SIGINT
1696:
1697: Parent signal assignment:
1698: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
1699:
1700: Child signal assignment:
1701: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
1702: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
1703: to restart a new child.)
1704:
1705: Command-line invocations:
1706: B<kill> B<-s> SIGTERM I<PID>
1707: B<kill> B<-s> SIGINT I<PID>
1708:
1709: Subroutine B<HUNTSMAN>:
1710: This is only invoked for the B<lond> parent I<PID>.
1711: This kills all the children, and then the parent.
1712: The B<lonc.pid> file is cleared.
1713:
1714: =item *
1715:
1716: SIGHUP
1717:
1718: Current bug:
1719: This signal can only be processed the first time
1720: on the parent process. Subsequent SIGHUP signals
1721: have no effect.
1722:
1723: Parent signal assignment:
1724: $SIG{HUP} = \&HUPSMAN;
1725:
1726: Child signal assignment:
1727: none (nothing happens)
1728:
1729: Command-line invocations:
1730: B<kill> B<-s> SIGHUP I<PID>
1731:
1732: Subroutine B<HUPSMAN>:
1733: This is only invoked for the B<lond> parent I<PID>,
1734: This kills all the children, and then the parent.
1735: The B<lond.pid> file is cleared.
1736:
1737: =item *
1738:
1739: SIGUSR1
1740:
1741: Parent signal assignment:
1742: $SIG{USR1} = \&USRMAN;
1743:
1744: Child signal assignment:
1745: $SIG{USR1}= \&logstatus;
1746:
1747: Command-line invocations:
1748: B<kill> B<-s> SIGUSR1 I<PID>
1749:
1750: Subroutine B<USRMAN>:
1751: When invoked for the B<lond> parent I<PID>,
1752: SIGUSR1 is sent to all the children, and the status of
1753: each connection is logged.
1754:
1755: =item *
1756:
1757: SIGCHLD
1758:
1759: Parent signal assignment:
1760: $SIG{CHLD} = \&REAPER;
1761:
1762: Child signal assignment:
1763: none
1764:
1765: Command-line invocations:
1766: B<kill> B<-s> SIGCHLD I<PID>
1767:
1768: Subroutine B<REAPER>:
1769: This is only invoked for the B<lond> parent I<PID>.
1770: Information pertaining to the child is removed.
1771: The socket port is cleaned up.
1772:
1773: =back
1774:
1775: B<SERVER-SIDE ACTIVITIES>
1776:
1777: Server-side information can be accepted in an encrypted or non-encrypted
1778: method.
1779:
1780: =over 4
1781:
1782: =item ping
1783:
1784: Query a client in the hosts.tab table; "Are you there?"
1785:
1786: =item pong
1787:
1788: Respond to a ping query.
1789:
1790: =item ekey
1791:
1792: Read in encrypted key, make cipher. Respond with a buildkey.
1793:
1794: =item load
1795:
1796: Respond with CPU load based on a computation upon /proc/loadavg.
1797:
1798: =item currentauth
1799:
1800: Reply with current authentication information (only over an
1801: encrypted channel).
1802:
1803: =item auth
1804:
1805: Only over an encrypted channel, reply as to whether a user's
1806: authentication information can be validated.
1807:
1808: =item passwd
1809:
1810: Allow for a password to be set.
1811:
1812: =item makeuser
1813:
1814: Make a user.
1815:
1816: =item passwd
1817:
1818: Allow for authentication mechanism and password to be changed.
1819:
1820: =item home
1821:
1822: Respond to a question "are you the home for a given user?"
1823:
1824: =item update
1825:
1826: Update contents of a subscribed resource.
1827:
1828: =item unsubscribe
1829:
1830: The server is unsubscribing from a resource.
1831:
1832: =item subscribe
1833:
1834: The server is subscribing to a resource.
1835:
1836: =item log
1837:
1838: Place in B<logs/lond.log>
1839:
1840: =item put
1841:
1842: stores hash in namespace
1843:
1844: =item rolesput
1845:
1846: put a role into a user's environment
1847:
1848: =item get
1849:
1850: returns hash with keys from array
1851: reference filled in from namespace
1852:
1853: =item eget
1854:
1855: returns hash with keys from array
1856: reference filled in from namesp (encrypts the return communication)
1857:
1858: =item rolesget
1859:
1860: get a role from a user's environment
1861:
1862: =item del
1863:
1864: deletes keys out of array from namespace
1865:
1866: =item keys
1867:
1868: returns namespace keys
1869:
1870: =item dump
1871:
1872: dumps the complete (or key matching regexp) namespace into a hash
1873:
1874: =item store
1875:
1876: stores hash permanently
1877: for this url; hashref needs to be given and should be a \%hashname; the
1878: remaining args aren't required and if they aren't passed or are '' they will
1879: be derived from the ENV
1880:
1881: =item restore
1882:
1883: returns a hash for a given url
1884:
1885: =item querysend
1886:
1887: Tells client about the lonsql process that has been launched in response
1888: to a sent query.
1889:
1890: =item queryreply
1891:
1892: Accept information from lonsql and make appropriate storage in temporary
1893: file space.
1894:
1895: =item idput
1896:
1897: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
1898: for each student, defined perhaps by the institutional Registrar.)
1899:
1900: =item idget
1901:
1902: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
1903: for each student, defined perhaps by the institutional Registrar.)
1904:
1905: =item tmpput
1906:
1907: Accept and store information in temporary space.
1908:
1909: =item tmpget
1910:
1911: Send along temporarily stored information.
1912:
1913: =item ls
1914:
1915: List part of a user's directory.
1916:
1917: =item Hanging up (exit or init)
1918:
1919: What to do when a client tells the server that they (the client)
1920: are leaving the network.
1921:
1922: =item unknown command
1923:
1924: If B<lond> is sent an unknown command (not in the list above),
1925: it replys to the client "unknown_cmd".
1926:
1927: =item UNKNOWN CLIENT
1928:
1929: If the anti-spoofing algorithm cannot verify the client,
1930: the client is rejected (with a "refused" message sent
1931: to the client, and the connection is closed.
1932:
1933: =back
1934:
1935: =head1 PREREQUISITES
1936:
1937: IO::Socket
1938: IO::File
1939: Apache::File
1940: Symbol
1941: POSIX
1942: Crypt::IDEA
1943: LWP::UserAgent()
1944: GDBM_File
1945: Authen::Krb4
1946: Authen::Krb5
1947:
1948: =head1 COREQUISITES
1949:
1950: =head1 OSNAMES
1951:
1952: linux
1953:
1954: =head1 SCRIPT CATEGORIES
1955:
1956: Server/Process
1957:
1958: =cut
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