1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.90.2.1 2002/09/03 02:02:50 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 lib '/home/httpd/lib/perl/';
78: use localauth;
79:
80: my $DEBUG = 0; # Non zero to enable debug log entries.
81:
82: my $status='';
83: my $lastlog='';
84:
85: # grabs exception and records it to log before exiting
86: sub catchexception {
87: my ($error)=@_;
88: $SIG{'QUIT'}='DEFAULT';
89: $SIG{__DIE__}='DEFAULT';
90: &logthis("<font color=red>CRITICAL: "
91: ."ABNORMAL EXIT. Child $$ for server $wasserver died through "
92: ."a crash with this error msg->[$error]</font>");
93: &logthis('Famous last words: '.$status.' - '.$lastlog);
94: if ($client) { print $client "error: $error\n"; }
95: $server->close();
96: die($error);
97: }
98:
99: sub timeout {
100: &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
101: &catchexception('Timeout');
102: }
103: # -------------------------------- Set signal handlers to record abnormal exits
104:
105: $SIG{'QUIT'}=\&catchexception;
106: $SIG{__DIE__}=\&catchexception;
107:
108: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
109: &status("Read loncapa_apache.conf and loncapa.conf");
110: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa_apache.conf',
111: 'loncapa.conf');
112: my %perlvar=%{$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:
492: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
493: for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
494: &status('Idle, waiting for connection');
495: $client = $server->accept() or last;
496: &status('Accepted connection');
497: # =============================================================================
498: # do something with the connection
499: # -----------------------------------------------------------------------------
500: $client->sockopt(SO_KEEPALIVE, 1);# Enable monitoring of
501: # connection liveness.
502: # see if we know client and check for spoof IP by challenge
503: my $caller=getpeername($client);
504: my ($port,$iaddr)=unpack_sockaddr_in($caller);
505: my $clientip=inet_ntoa($iaddr);
506: my $clientrec=($hostid{$clientip} ne undef);
507: &logthis(
508: "<font color=yellow>INFO: Connection $i, $clientip ($hostid{$clientip})</font>"
509: );
510: &status("Connecting $clientip ($hostid{$clientip})");
511: my $clientok;
512: if ($clientrec) {
513: &status("Waiting for init from $clientip ($hostid{$clientip})");
514: my $remotereq=<$client>;
515: $remotereq=~s/\W//g;
516: if ($remotereq eq 'init') {
517: my $challenge="$$".time;
518: print $client "$challenge\n";
519: &status(
520: "Waiting for challenge reply from $clientip ($hostid{$clientip})");
521: $remotereq=<$client>;
522: $remotereq=~s/\W//g;
523: if ($challenge eq $remotereq) {
524: $clientok=1;
525: print $client "ok\n";
526: } else {
527: &logthis(
528: "<font color=blue>WARNING: $clientip did not reply challenge</font>");
529: &status('No challenge reply '.$clientip);
530: }
531: } else {
532: &logthis(
533: "<font color=blue>WARNING: "
534: ."$clientip failed to initialize: >$remotereq< </font>");
535: &status('No init '.$clientip);
536: }
537: } else {
538: &logthis(
539: "<font color=blue>WARNING: Unknown client $clientip</font>");
540: &status('Hung up on '.$clientip);
541: }
542: if ($clientok) {
543: # ---------------- New known client connecting, could mean machine online again
544:
545: &reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
546: &logthis(
547: "<font color=green>Established connection: $hostid{$clientip}</font>");
548: &status('Will listen to '.$hostid{$clientip});
549: # ------------------------------------------------------------ Process requests
550: while (my $userinput=<$client>) {
551: chomp($userinput);
552: Debug("Request = $userinput\n");
553: &status('Processing '.$hostid{$clientip}.': '.$userinput);
554: my $wasenc=0;
555: alarm(120);
556: # ------------------------------------------------------------ See if encrypted
557: if ($userinput =~ /^enc/) {
558: if ($cipher) {
559: my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
560: $userinput='';
561: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
562: $userinput.=
563: $cipher->decrypt(
564: pack("H16",substr($encinput,$encidx,16))
565: );
566: }
567: $userinput=substr($userinput,0,$cmdlength);
568: $wasenc=1;
569: }
570: }
571:
572: # ------------------------------------------------------------- Normal commands
573: # ------------------------------------------------------------------------ ping
574: if ($userinput =~ /^ping/) {
575: print $client "$perlvar{'lonHostID'}\n";
576: # ------------------------------------------------------------------------ pong
577: } elsif ($userinput =~ /^pong/) {
578: $reply=reply("ping",$hostid{$clientip});
579: print $client "$perlvar{'lonHostID'}:$reply\n";
580: # ------------------------------------------------------------------------ ekey
581: } elsif ($userinput =~ /^ekey/) {
582: my $buildkey=time.$$.int(rand 100000);
583: $buildkey=~tr/1-6/A-F/;
584: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
585: my $key=$perlvar{'lonHostID'}.$hostid{$clientip};
586: $key=~tr/a-z/A-Z/;
587: $key=~tr/G-P/0-9/;
588: $key=~tr/Q-Z/0-9/;
589: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
590: $key=substr($key,0,32);
591: my $cipherkey=pack("H32",$key);
592: $cipher=new IDEA $cipherkey;
593: print $client "$buildkey\n";
594: # ------------------------------------------------------------------------ load
595: } elsif ($userinput =~ /^load/) {
596: my $loadavg;
597: {
598: my $loadfile=IO::File->new('/proc/loadavg');
599: $loadavg=<$loadfile>;
600: }
601: $loadavg =~ s/\s.*//g;
602: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
603: print $client "$loadpercent\n";
604: # ----------------------------------------------------------------- currentauth
605: } elsif ($userinput =~ /^currentauth/) {
606: if ($wasenc==1) {
607: my ($cmd,$udom,$uname)=split(/:/,$userinput);
608: my $result = GetAuthType($udom, $uname);
609: if($result eq "nouser") {
610: print $client "unknown_user\n";
611: }
612: else {
613: print $client "$result\n"
614: }
615: } else {
616: print $client "refused\n";
617: }
618: # ------------------------------------------------------------------------ auth
619: } elsif ($userinput =~ /^auth/) {
620: if ($wasenc==1) {
621: my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
622: chomp($upass);
623: $upass=unescape($upass);
624: my $proname=propath($udom,$uname);
625: my $passfilename="$proname/passwd";
626: if (-e $passfilename) {
627: my $pf = IO::File->new($passfilename);
628: my $realpasswd=<$pf>;
629: chomp($realpasswd);
630: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
631: my $pwdcorrect=0;
632: if ($howpwd eq 'internal') {
633: $pwdcorrect=
634: (crypt($upass,$contentpwd) eq $contentpwd);
635: } elsif ($howpwd eq 'unix') {
636: $contentpwd=(getpwnam($uname))[1];
637: my $pwauth_path="/usr/local/sbin/pwauth";
638: unless ($contentpwd eq 'x') {
639: $pwdcorrect=
640: (crypt($upass,$contentpwd) eq $contentpwd);
641: }
642: elsif (-e $pwauth_path) {
643: open PWAUTH, "|$pwauth_path" or
644: die "Cannot invoke authentication";
645: print PWAUTH "$uname\n$upass\n";
646: close PWAUTH;
647: $pwdcorrect=!$?;
648: }
649: } elsif ($howpwd eq 'krb4') {
650: $null=pack("C",0);
651: unless ($upass=~/$null/) {
652: $pwdcorrect=(
653: Authen::Krb4::get_pw_in_tkt($uname,"",
654: $contentpwd,'krbtgt',$contentpwd,1,
655: $upass) == 0);
656: } else { $pwdcorrect=0; }
657: } elsif ($howpwd eq 'localauth') {
658: $pwdcorrect=&localauth::localauth($uname,$upass,
659: $contentpwd);
660: }
661: if ($pwdcorrect) {
662: print $client "authorized\n";
663: } else {
664: print $client "non_authorized\n";
665: }
666: } else {
667: print $client "unknown_user\n";
668: }
669: } else {
670: print $client "refused\n";
671: }
672: # ---------------------------------------------------------------------- passwd
673: } elsif ($userinput =~ /^passwd/) {
674: if ($wasenc==1) {
675: my
676: ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
677: chomp($npass);
678: $upass=&unescape($upass);
679: $npass=&unescape($npass);
680: &logthis("Trying to change password for $uname");
681: my $proname=propath($udom,$uname);
682: my $passfilename="$proname/passwd";
683: if (-e $passfilename) {
684: my $realpasswd;
685: { my $pf = IO::File->new($passfilename);
686: $realpasswd=<$pf>; }
687: chomp($realpasswd);
688: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
689: if ($howpwd eq 'internal') {
690: if (crypt($upass,$contentpwd) eq $contentpwd) {
691: my $salt=time;
692: $salt=substr($salt,6,2);
693: my $ncpass=crypt($npass,$salt);
694: { my $pf = IO::File->new(">$passfilename");
695: print $pf "internal:$ncpass\n"; }
696: &logthis("Result of password change for $uname: pwchange_success");
697: print $client "ok\n";
698: } else {
699: print $client "non_authorized\n";
700: }
701: } elsif ($howpwd eq 'unix') {
702: # Unix means we have to access /etc/password
703: # one way or another.
704: # First: Make sure the current password is
705: # correct
706: $contentpwd=(getpwnam($uname))[1];
707: my $pwdcorrect = "0";
708: my $pwauth_path="/usr/local/sbin/pwauth";
709: unless ($contentpwd eq 'x') {
710: $pwdcorrect=
711: (crypt($upass,$contentpwd) eq $contentpwd);
712: } elsif (-e $pwauth_path) {
713: open PWAUTH, "|$pwauth_path" or
714: die "Cannot invoke authentication";
715: print PWAUTH "$uname\n$upass\n";
716: close PWAUTH;
717: $pwdcorrect=!$?;
718: }
719: if ($pwdcorrect) {
720: my $execdir=$perlvar{'lonDaemons'};
721: my $pf = IO::File->new("|$execdir/lcpasswd");
722: print $pf "$uname\n$npass\n$npass\n";
723: close $pf;
724: my $result = ($?>0 ? 'pwchange_failure'
725: : 'ok');
726: &logthis("Result of password change for $uname: $result");
727: print $client "$result\n";
728: } else {
729: print $client "non_authorized\n";
730: }
731: } else {
732: print $client "auth_mode_error\n";
733: }
734: } else {
735: print $client "unknown_user\n";
736: }
737: } else {
738: print $client "refused\n";
739: }
740: # -------------------------------------------------------------------- makeuser
741: } elsif ($userinput =~ /^makeuser/) {
742: Debug("Make user received");
743: my $oldumask=umask(0077);
744: if ($wasenc==1) {
745: my
746: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
747: &Debug("cmd =".$cmd." $udom =".$udom.
748: " uname=".$uname);
749: chomp($npass);
750: $npass=&unescape($npass);
751: my $proname=propath($udom,$uname);
752: my $passfilename="$proname/passwd";
753: &Debug("Password file created will be:".
754: $passfilename);
755: if (-e $passfilename) {
756: print $client "already_exists\n";
757: } elsif ($udom ne $perlvar{'lonDefDomain'}) {
758: print $client "not_right_domain\n";
759: } else {
760: @fpparts=split(/\//,$proname);
761: $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
762: $fperror='';
763: for ($i=3;$i<=$#fpparts;$i++) {
764: $fpnow.='/'.$fpparts[$i];
765: unless (-e $fpnow) {
766: unless (mkdir($fpnow,0777)) {
767: $fperror="error:$!";
768: }
769: }
770: }
771: unless ($fperror) {
772: if ($umode eq 'krb4') {
773: {
774: my $pf = IO::File->new(">$passfilename");
775: print $pf "krb4:$npass\n";
776: }
777: print $client "ok\n";
778: } elsif ($umode eq 'internal') {
779: my $salt=time;
780: $salt=substr($salt,6,2);
781: my $ncpass=crypt($npass,$salt);
782: {
783: &Debug("Creating internal auth");
784: my $pf = IO::File->new(">$passfilename");
785: print $pf "internal:$ncpass\n";
786: }
787: print $client "ok\n";
788: } elsif ($umode eq 'localauth') {
789: {
790: my $pf = IO::File->new(">$passfilename");
791: print $pf "localauth:$npass\n";
792: }
793: print $client "ok\n";
794: } elsif ($umode eq 'unix') {
795: {
796: my $execpath="$perlvar{'lonDaemons'}/".
797: "lcuseradd";
798: {
799: &Debug("Executing external: ".
800: $execpath);
801: my $se = IO::File->new("|$execpath");
802: print $se "$uname\n";
803: print $se "$npass\n";
804: print $se "$npass\n";
805: }
806: my $pf = IO::File->new(">$passfilename");
807: print $pf "unix:\n";
808: }
809: print $client "ok\n";
810: } elsif ($umode eq 'none') {
811: {
812: my $pf = IO::File->new(">$passfilename");
813: print $pf "none:\n";
814: }
815: print $client "ok\n";
816: } else {
817: print $client "auth_mode_error\n";
818: }
819: } else {
820: print $client "$fperror\n";
821: }
822: }
823: } else {
824: print $client "refused\n";
825: }
826: umask($oldumask);
827: # -------------------------------------------------------------- changeuserauth
828: } elsif ($userinput =~ /^changeuserauth/) {
829: &Debug("Changing authorization");
830: if ($wasenc==1) {
831: my
832: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
833: chomp($npass);
834: &Debug("cmd = ".$cmd." domain= ".$udom.
835: "uname =".$uname." umode= ".$umode);
836: $npass=&unescape($npass);
837: my $proname=propath($udom,$uname);
838: my $passfilename="$proname/passwd";
839: if ($udom ne $perlvar{'lonDefDomain'}) {
840: print $client "not_right_domain\n";
841: } else {
842: if ($umode eq 'krb4') {
843: {
844: my $pf = IO::File->new(">$passfilename");
845: print $pf "krb4:$npass\n";
846: }
847: print $client "ok\n";
848: } elsif ($umode eq 'internal') {
849: my $salt=time;
850: $salt=substr($salt,6,2);
851: my $ncpass=crypt($npass,$salt);
852: {
853: my $pf = IO::File->new(">$passfilename");
854: print $pf "internal:$ncpass\n";
855: }
856: print $client "ok\n";
857: } elsif ($umode eq 'localauth') {
858: {
859: my $pf = IO::File->new(">$passfilename");
860: print $pf "localauth:$npass\n";
861: }
862: print $client "ok\n";
863: } elsif ($umode eq 'unix') {
864: {
865: my $execpath="$perlvar{'lonDaemons'}/".
866: "lcuseradd";
867: {
868: my $se = IO::File->new("|$execpath");
869: print $se "$uname\n";
870: print $se "$npass\n";
871: print $se "$npass\n";
872: }
873: my $pf = IO::File->new(">$passfilename");
874: print $pf "unix:\n";
875: }
876: print $client "ok\n";
877: } elsif ($umode eq 'none') {
878: {
879: my $pf = IO::File->new(">$passfilename");
880: print $pf "none:\n";
881: }
882: print $client "ok\n";
883: } else {
884: print $client "auth_mode_error\n";
885: }
886: }
887: } else {
888: print $client "refused\n";
889: }
890: # ------------------------------------------------------------------------ home
891: } elsif ($userinput =~ /^home/) {
892: my ($cmd,$udom,$uname)=split(/:/,$userinput);
893: chomp($uname);
894: my $proname=propath($udom,$uname);
895: if (-e $proname) {
896: print $client "found\n";
897: } else {
898: print $client "not_found\n";
899: }
900: # ---------------------------------------------------------------------- update
901: } elsif ($userinput =~ /^update/) {
902: my ($cmd,$fname)=split(/:/,$userinput);
903: my $ownership=ishome($fname);
904: if ($ownership eq 'not_owner') {
905: if (-e $fname) {
906: my ($dev,$ino,$mode,$nlink,
907: $uid,$gid,$rdev,$size,
908: $atime,$mtime,$ctime,
909: $blksize,$blocks)=stat($fname);
910: $now=time;
911: $since=$now-$atime;
912: if ($since>$perlvar{'lonExpire'}) {
913: $reply=
914: reply("unsub:$fname","$hostid{$clientip}");
915: unlink("$fname");
916: } else {
917: my $transname="$fname.in.transfer";
918: my $remoteurl=
919: reply("sub:$fname","$hostid{$clientip}");
920: my $response;
921: {
922: my $ua=new LWP::UserAgent;
923: my $request=new HTTP::Request('GET',"$remoteurl");
924: $response=$ua->request($request,$transname);
925: }
926: if ($response->is_error()) {
927: unlink($transname);
928: my $message=$response->status_line;
929: &logthis(
930: "LWP GET: $message for $fname ($remoteurl)");
931: } else {
932: if ($remoteurl!~/\.meta$/) {
933: my $ua=new LWP::UserAgent;
934: my $mrequest=
935: new HTTP::Request('GET',$remoteurl.'.meta');
936: my $mresponse=
937: $ua->request($mrequest,$fname.'.meta');
938: if ($mresponse->is_error()) {
939: unlink($fname.'.meta');
940: }
941: }
942: rename($transname,$fname);
943: }
944: }
945: print $client "ok\n";
946: } else {
947: print $client "not_found\n";
948: }
949: } else {
950: print $client "rejected\n";
951: }
952: # -------------------------------------- fetch a user file from a remote server
953: } elsif ($userinput =~ /^fetchuserfile/) {
954: my ($cmd,$fname)=split(/:/,$userinput);
955: my ($udom,$uname,$ufile)=split(/\//,$fname);
956: my $udir=propath($udom,$uname).'/userfiles';
957: unless (-e $udir) { mkdir($udir,0770); }
958: if (-e $udir) {
959: $ufile=~s/^[\.\~]+//;
960: $ufile=~s/\///g;
961: my $transname=$udir.'/'.$ufile;
962: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
963: my $response;
964: {
965: my $ua=new LWP::UserAgent;
966: my $request=new HTTP::Request('GET',"$remoteurl");
967: $response=$ua->request($request,$transname);
968: }
969: if ($response->is_error()) {
970: unlink($transname);
971: my $message=$response->status_line;
972: &logthis(
973: "LWP GET: $message for $fname ($remoteurl)");
974: print $client "failed\n";
975: } else {
976: print $client "ok\n";
977: }
978: } else {
979: print $client "not_home\n";
980: }
981: # ------------------------------------------ authenticate access to a user file
982: } elsif ($userinput =~ /^tokenauthuserfile/) {
983: my ($cmd,$fname,$session)=split(/:/,$userinput);
984: chomp($session);
985: $reply='non_auth';
986: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
987: $session.'.id')) {
988: while ($line=<ENVIN>) {
989: if ($line=~/userfile\.$fname\=/) { $reply='ok'; }
990: }
991: close(ENVIN);
992: print $client $reply."\n";
993: } else {
994: print $client "invalid_token\n";
995: }
996: # ----------------------------------------------------------------- unsubscribe
997: } elsif ($userinput =~ /^unsub/) {
998: my ($cmd,$fname)=split(/:/,$userinput);
999: if (-e $fname) {
1000: print $client &unsub($client,$fname,$clientip);
1001: } else {
1002: print $client "not_found\n";
1003: }
1004: # ------------------------------------------------------------------- subscribe
1005: } elsif ($userinput =~ /^sub/) {
1006: print $client &subscribe($userinput,$clientip);
1007: # ------------------------------------------------------------------------- log
1008: } elsif ($userinput =~ /^log/) {
1009: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
1010: chomp($what);
1011: my $proname=propath($udom,$uname);
1012: my $now=time;
1013: {
1014: my $hfh;
1015: if ($hfh=IO::File->new(">>$proname/activity.log")) {
1016: print $hfh "$now:$hostid{$clientip}:$what\n";
1017: print $client "ok\n";
1018: } else {
1019: print $client "error:$!\n";
1020: }
1021: }
1022: # ------------------------------------------------------------------------- put
1023: } elsif ($userinput =~ /^put/) {
1024: my ($cmd,$udom,$uname,$namespace,$what)
1025: =split(/:/,$userinput);
1026: $namespace=~s/\//\_/g;
1027: $namespace=~s/\W//g;
1028: if ($namespace ne 'roles') {
1029: chomp($what);
1030: my $proname=propath($udom,$uname);
1031: my $now=time;
1032: unless ($namespace=~/^nohist\_/) {
1033: my $hfh;
1034: if (
1035: $hfh=IO::File->new(">>$proname/$namespace.hist")
1036: ) { print $hfh "P:$now:$what\n"; }
1037: }
1038: my @pairs=split(/\&/,$what);
1039: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1040: foreach $pair (@pairs) {
1041: ($key,$value)=split(/=/,$pair);
1042: $hash{$key}=$value;
1043: }
1044: if (untie(%hash)) {
1045: print $client "ok\n";
1046: } else {
1047: print $client "error:$!\n";
1048: }
1049: } else {
1050: print $client "error:$!\n";
1051: }
1052: } else {
1053: print $client "refused\n";
1054: }
1055: # -------------------------------------------------------------------- rolesput
1056: } elsif ($userinput =~ /^rolesput/) {
1057: &Debug("rolesput");
1058: if ($wasenc==1) {
1059: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
1060: =split(/:/,$userinput);
1061: &Debug("cmd = ".$cmd." exedom= ".$exedom.
1062: "user = ".$exeuser." udom=".$udom.
1063: "what = ".$what);
1064: my $namespace='roles';
1065: chomp($what);
1066: my $proname=propath($udom,$uname);
1067: my $now=time;
1068: {
1069: my $hfh;
1070: if (
1071: $hfh=IO::File->new(">>$proname/$namespace.hist")
1072: ) {
1073: print $hfh "P:$now:$exedom:$exeuser:$what\n";
1074: }
1075: }
1076: my @pairs=split(/\&/,$what);
1077: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1078: foreach $pair (@pairs) {
1079: ($key,$value)=split(/=/,$pair);
1080: &ManagePermissions($key, $udom, $uname,
1081: &GetAuthType( $udom,
1082: $uname));
1083: $hash{$key}=$value;
1084:
1085: }
1086: if (untie(%hash)) {
1087: print $client "ok\n";
1088: } else {
1089: print $client "error:$!\n";
1090: }
1091: } else {
1092: print $client "error:$!\n";
1093: }
1094: } else {
1095: print $client "refused\n";
1096: }
1097: # ------------------------------------------------------------------------- get
1098: } elsif ($userinput =~ /^get/) {
1099: my ($cmd,$udom,$uname,$namespace,$what)
1100: =split(/:/,$userinput);
1101: $namespace=~s/\//\_/g;
1102: $namespace=~s/\W//g;
1103: chomp($what);
1104: my @queries=split(/\&/,$what);
1105: my $proname=propath($udom,$uname);
1106: my $qresult='';
1107: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1108: for ($i=0;$i<=$#queries;$i++) {
1109: $qresult.="$hash{$queries[$i]}&";
1110: }
1111: if (untie(%hash)) {
1112: $qresult=~s/\&$//;
1113: print $client "$qresult\n";
1114: } else {
1115: print $client "error:$!\n";
1116: }
1117: } else {
1118: print $client "error:$!\n";
1119: }
1120: # ------------------------------------------------------------------------ eget
1121: } elsif ($userinput =~ /^eget/) {
1122: my ($cmd,$udom,$uname,$namespace,$what)
1123: =split(/:/,$userinput);
1124: $namespace=~s/\//\_/g;
1125: $namespace=~s/\W//g;
1126: chomp($what);
1127: my @queries=split(/\&/,$what);
1128: my $proname=propath($udom,$uname);
1129: my $qresult='';
1130: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1131: for ($i=0;$i<=$#queries;$i++) {
1132: $qresult.="$hash{$queries[$i]}&";
1133: }
1134: if (untie(%hash)) {
1135: $qresult=~s/\&$//;
1136: if ($cipher) {
1137: my $cmdlength=length($qresult);
1138: $qresult.=" ";
1139: my $encqresult='';
1140: for
1141: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
1142: $encqresult.=
1143: unpack("H16",
1144: $cipher->encrypt(substr($qresult,$encidx,8)));
1145: }
1146: print $client "enc:$cmdlength:$encqresult\n";
1147: } else {
1148: print $client "error:no_key\n";
1149: }
1150: } else {
1151: print $client "error:$!\n";
1152: }
1153: } else {
1154: print $client "error:$!\n";
1155: }
1156: # ------------------------------------------------------------------------- del
1157: } elsif ($userinput =~ /^del/) {
1158: my ($cmd,$udom,$uname,$namespace,$what)
1159: =split(/:/,$userinput);
1160: $namespace=~s/\//\_/g;
1161: $namespace=~s/\W//g;
1162: chomp($what);
1163: my $proname=propath($udom,$uname);
1164: my $now=time;
1165: unless ($namespace=~/^nohist\_/) {
1166: my $hfh;
1167: if (
1168: $hfh=IO::File->new(">>$proname/$namespace.hist")
1169: ) { print $hfh "D:$now:$what\n"; }
1170: }
1171: my @keys=split(/\&/,$what);
1172: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1173: foreach $key (@keys) {
1174: delete($hash{$key});
1175: }
1176: if (untie(%hash)) {
1177: print $client "ok\n";
1178: } else {
1179: print $client "error:$!\n";
1180: }
1181: } else {
1182: print $client "error:$!\n";
1183: }
1184: # ------------------------------------------------------------------------ keys
1185: } elsif ($userinput =~ /^keys/) {
1186: my ($cmd,$udom,$uname,$namespace)
1187: =split(/:/,$userinput);
1188: $namespace=~s/\//\_/g;
1189: $namespace=~s/\W//g;
1190: my $proname=propath($udom,$uname);
1191: my $qresult='';
1192: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1193: foreach $key (keys %hash) {
1194: $qresult.="$key&";
1195: }
1196: if (untie(%hash)) {
1197: $qresult=~s/\&$//;
1198: print $client "$qresult\n";
1199: } else {
1200: print $client "error:$!\n";
1201: }
1202: } else {
1203: print $client "error:$!\n";
1204: }
1205: # ------------------------------------------------------------------------ dump
1206: } elsif ($userinput =~ /^dump/) {
1207: my ($cmd,$udom,$uname,$namespace,$regexp)
1208: =split(/:/,$userinput);
1209: $namespace=~s/\//\_/g;
1210: $namespace=~s/\W//g;
1211: if (defined($regexp)) {
1212: $regexp=&unescape($regexp);
1213: } else {
1214: $regexp='.';
1215: }
1216: my $proname=propath($udom,$uname);
1217: my $qresult='';
1218: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1219: study($regexp);
1220: foreach $key (keys %hash) {
1221: my $unescapeKey = &unescape($key);
1222: if (eval('$unescapeKey=~/$regexp/')) {
1223: $qresult.="$key=$hash{$key}&";
1224: }
1225: }
1226: if (untie(%hash)) {
1227: $qresult=~s/\&$//;
1228: print $client "$qresult\n";
1229: } else {
1230: print $client "error:$!\n";
1231: }
1232: } else {
1233: print $client "error:$!\n";
1234: }
1235: # ----------------------------------------------------------------------- store
1236: } elsif ($userinput =~ /^store/) {
1237: my ($cmd,$udom,$uname,$namespace,$rid,$what)
1238: =split(/:/,$userinput);
1239: $namespace=~s/\//\_/g;
1240: $namespace=~s/\W//g;
1241: if ($namespace ne 'roles') {
1242: chomp($what);
1243: my $proname=propath($udom,$uname);
1244: my $now=time;
1245: unless ($namespace=~/^nohist\_/) {
1246: my $hfh;
1247: if (
1248: $hfh=IO::File->new(">>$proname/$namespace.hist")
1249: ) { print $hfh "P:$now:$rid:$what\n"; }
1250: }
1251: my @pairs=split(/\&/,$what);
1252:
1253: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1254: my @previouskeys=split(/&/,$hash{"keys:$rid"});
1255: my $key;
1256: $hash{"version:$rid"}++;
1257: my $version=$hash{"version:$rid"};
1258: my $allkeys='';
1259: foreach $pair (@pairs) {
1260: ($key,$value)=split(/=/,$pair);
1261: $allkeys.=$key.':';
1262: $hash{"$version:$rid:$key"}=$value;
1263: }
1264: $hash{"$version:$rid:timestamp"}=$now;
1265: $allkeys.='timestamp';
1266: $hash{"$version:keys:$rid"}=$allkeys;
1267: if (untie(%hash)) {
1268: print $client "ok\n";
1269: } else {
1270: print $client "error:$!\n";
1271: }
1272: } else {
1273: print $client "error:$!\n";
1274: }
1275: } else {
1276: print $client "refused\n";
1277: }
1278: # --------------------------------------------------------------------- restore
1279: } elsif ($userinput =~ /^restore/) {
1280: my ($cmd,$udom,$uname,$namespace,$rid)
1281: =split(/:/,$userinput);
1282: $namespace=~s/\//\_/g;
1283: $namespace=~s/\W//g;
1284: chomp($rid);
1285: my $proname=propath($udom,$uname);
1286: my $qresult='';
1287: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1288: my $version=$hash{"version:$rid"};
1289: $qresult.="version=$version&";
1290: my $scope;
1291: for ($scope=1;$scope<=$version;$scope++) {
1292: my $vkeys=$hash{"$scope:keys:$rid"};
1293: my @keys=split(/:/,$vkeys);
1294: my $key;
1295: $qresult.="$scope:keys=$vkeys&";
1296: foreach $key (@keys) {
1297: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
1298: }
1299: }
1300: if (untie(%hash)) {
1301: $qresult=~s/\&$//;
1302: print $client "$qresult\n";
1303: } else {
1304: print $client "error:$!\n";
1305: }
1306: } else {
1307: print $client "error:$!\n";
1308: }
1309: # -------------------------------------------------------------------- chatsend
1310: } elsif ($userinput =~ /^chatsend/) {
1311: my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
1312: &chatadd($cdom,$cnum,$newpost);
1313: print $client "ok\n";
1314: # -------------------------------------------------------------------- chatretr
1315: } elsif ($userinput =~ /^chatretr/) {
1316: my ($cmd,$cdom,$cnum)=split(/\:/,$userinput);
1317: my $reply='';
1318: foreach (&getchat($cdom,$cnum)) {
1319: $reply.=&escape($_).':';
1320: }
1321: $reply=~s/\:$//;
1322: print $client $reply."\n";
1323: # ------------------------------------------------------------------- querysend
1324: } elsif ($userinput =~ /^querysend/) {
1325: my ($cmd,$query,
1326: $arg1,$arg2,$arg3)=split(/\:/,$userinput);
1327: $query=~s/\n*$//g;
1328: print $client "".
1329: sqlreply("$hostid{$clientip}\&$query".
1330: "\&$arg1"."\&$arg2"."\&$arg3")."\n";
1331: # ------------------------------------------------------------------ queryreply
1332: } elsif ($userinput =~ /^queryreply/) {
1333: my ($cmd,$id,$reply)=split(/:/,$userinput);
1334: my $store;
1335: my $execdir=$perlvar{'lonDaemons'};
1336: if ($store=IO::File->new(">$execdir/tmp/$id")) {
1337: $reply=~s/\&/\n/g;
1338: print $store $reply;
1339: close $store;
1340: my $store2=IO::File->new(">$execdir/tmp/$id.end");
1341: print $store2 "done\n";
1342: close $store2;
1343: print $client "ok\n";
1344: }
1345: else {
1346: print $client "error:$!\n";
1347: }
1348: # ----------------------------------------------------------------------- idput
1349: } elsif ($userinput =~ /^idput/) {
1350: my ($cmd,$udom,$what)=split(/:/,$userinput);
1351: chomp($what);
1352: $udom=~s/\W//g;
1353: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1354: my $now=time;
1355: {
1356: my $hfh;
1357: if (
1358: $hfh=IO::File->new(">>$proname.hist")
1359: ) { print $hfh "P:$now:$what\n"; }
1360: }
1361: my @pairs=split(/\&/,$what);
1362: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT,0640)) {
1363: foreach $pair (@pairs) {
1364: ($key,$value)=split(/=/,$pair);
1365: $hash{$key}=$value;
1366: }
1367: if (untie(%hash)) {
1368: print $client "ok\n";
1369: } else {
1370: print $client "error:$!\n";
1371: }
1372: } else {
1373: print $client "error:$!\n";
1374: }
1375: # ----------------------------------------------------------------------- idget
1376: } elsif ($userinput =~ /^idget/) {
1377: my ($cmd,$udom,$what)=split(/:/,$userinput);
1378: chomp($what);
1379: $udom=~s/\W//g;
1380: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1381: my @queries=split(/\&/,$what);
1382: my $qresult='';
1383: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER,0640)) {
1384: for ($i=0;$i<=$#queries;$i++) {
1385: $qresult.="$hash{$queries[$i]}&";
1386: }
1387: if (untie(%hash)) {
1388: $qresult=~s/\&$//;
1389: print $client "$qresult\n";
1390: } else {
1391: print $client "error:$!\n";
1392: }
1393: } else {
1394: print $client "error:$!\n";
1395: }
1396: # ---------------------------------------------------------------------- tmpput
1397: } elsif ($userinput =~ /^tmpput/) {
1398: my ($cmd,$what)=split(/:/,$userinput);
1399: my $store;
1400: $tmpsnum++;
1401: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
1402: $id=~s/\W/\_/g;
1403: $what=~s/\n//g;
1404: my $execdir=$perlvar{'lonDaemons'};
1405: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
1406: print $store $what;
1407: close $store;
1408: print $client "$id\n";
1409: }
1410: else {
1411: print $client "error:$!\n";
1412: }
1413:
1414: # ---------------------------------------------------------------------- tmpget
1415: } elsif ($userinput =~ /^tmpget/) {
1416: my ($cmd,$id)=split(/:/,$userinput);
1417: chomp($id);
1418: $id=~s/\W/\_/g;
1419: my $store;
1420: my $execdir=$perlvar{'lonDaemons'};
1421: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
1422: my $reply=<$store>;
1423: print $client "$reply\n";
1424: close $store;
1425: }
1426: else {
1427: print $client "error:$!\n";
1428: }
1429:
1430: # -------------------------------------------------------------------------- ls
1431: } elsif ($userinput =~ /^ls/) {
1432: my ($cmd,$ulsdir)=split(/:/,$userinput);
1433: my $ulsout='';
1434: my $ulsfn;
1435: if (-e $ulsdir) {
1436: if(-d $ulsdir) {
1437: if (opendir(LSDIR,$ulsdir)) {
1438: while ($ulsfn=readdir(LSDIR)) {
1439: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1440: $ulsout.=$ulsfn.'&'.
1441: join('&',@ulsstats).':';
1442: }
1443: closedir(LSDIR);
1444: }
1445: } else {
1446: my @ulsstats=stat($ulsdir);
1447: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1448: }
1449: } else {
1450: $ulsout='no_such_dir';
1451: }
1452: if ($ulsout eq '') { $ulsout='empty'; }
1453: print $client "$ulsout\n";
1454: # ------------------------------------------------------------------ Hanging up
1455: } elsif (($userinput =~ /^exit/) ||
1456: ($userinput =~ /^init/)) {
1457: &logthis(
1458: "Client $clientip ($hostid{$clientip}) hanging up: $userinput");
1459: print $client "bye\n";
1460: $client->close();
1461: last;
1462: # ------------------------------------------------------------- unknown command
1463: } else {
1464: # unknown command
1465: print $client "unknown_cmd\n";
1466: }
1467: # -------------------------------------------------------------------- complete
1468: alarm(0);
1469: &status('Listening to '.$hostid{$clientip});
1470: }
1471: # --------------------------------------------- client unknown or fishy, refuse
1472: } else {
1473: print $client "refused\n";
1474: $client->close();
1475: &logthis("<font color=blue>WARNING: "
1476: ."Rejected client $clientip, closing connection</font>");
1477: }
1478: }
1479:
1480: # =============================================================================
1481:
1482: &logthis("<font color=red>CRITICAL: "
1483: ."Disconnect from $clientip ($hostid{$clientip})</font>");
1484: # tidy up gracefully and finish
1485:
1486: $server->close();
1487:
1488: # this exit is VERY important, otherwise the child will become
1489: # a producer of more and more children, forking yourself into
1490: # process death.
1491: exit;
1492: }
1493: }
1494:
1495:
1496: #
1497: # Checks to see if the input roleput request was to set
1498: # an author role. If so, invokes the lchtmldir script to set
1499: # up a correct public_html
1500: # Parameters:
1501: # request - The request sent to the rolesput subchunk.
1502: # We're looking for /domain/_au
1503: # domain - The domain in which the user is having roles doctored.
1504: # user - Name of the user for which the role is being put.
1505: # authtype - The authentication type associated with the user.
1506: #
1507: sub ManagePermissions
1508: {
1509: my $request = shift;
1510: my $domain = shift;
1511: my $user = shift;
1512: my $authtype= shift;
1513:
1514: # See if the request is of the form /$domain/_au
1515:
1516: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
1517: my $execdir = $perlvar{'lonDaemons'};
1518: my $userhome= "/home/$user" ;
1519: Debug("system $execdir/lchtmldir $userhome $system $authtype");
1520: system("$execdir/lchtmldir $userhome $user $authtype");
1521: }
1522: }
1523: #
1524: # GetAuthType - Determines the authorization type of a user in a domain.
1525:
1526: # Returns the authorization type or nouser if there is no such user.
1527: #
1528: sub GetAuthType
1529: {
1530: my $domain = shift;
1531: my $user = shift;
1532:
1533: Debug("GetAuthType( $domain, $user ) \n");
1534: my $proname = &propath($domain, $user);
1535: my $passwdfile = "$proname/passwd";
1536: if( -e $passwdfile ) {
1537: my $pf = IO::File->new($passwdfile);
1538: my $realpassword = <$pf>;
1539: chomp($realpassword);
1540: Debug("Password info = $realpassword\n");
1541: my ($authtype, $contentpwd) = split(/:/, $realpassword);
1542: Debug("Authtype = $authtype, content = $contentpwd\n");
1543: my $availinfo = '';
1544: if($authtype eq 'krb4') {
1545: $availinfo = $contentpwd;
1546: }
1547:
1548: return "$authtype:$availinfo";
1549: }
1550: else {
1551: Debug("Returning nouser");
1552: return "nouser";
1553: }
1554: }
1555:
1556: sub addline {
1557: my ($fname,$hostid,$ip,$newline)=@_;
1558: my $contents;
1559: my $found=0;
1560: my $expr='^'.$hostid.':'.$ip.':';
1561: $expr =~ s/\./\\\./g;
1562: if ($sh=IO::File->new("$fname.subscription")) {
1563: while (my $subline=<$sh>) {
1564: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
1565: }
1566: $sh->close();
1567: }
1568: $sh=IO::File->new(">$fname.subscription");
1569: if ($contents) { print $sh $contents; }
1570: if ($newline) { print $sh $newline; }
1571: $sh->close();
1572: return $found;
1573: }
1574:
1575: sub getchat {
1576: my ($cdom,$cname)=@_;
1577: my %hash;
1578: my $proname=&propath($cdom,$cname);
1579: my @entries=();
1580: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
1581: &GDBM_READER(),0640)) {
1582: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
1583: untie %hash;
1584: }
1585: return @entries;
1586: }
1587:
1588: sub chatadd {
1589: my ($cdom,$cname,$newchat)=@_;
1590: my %hash;
1591: my $proname=&propath($cdom,$cname);
1592: my @entries=();
1593: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
1594: &GDBM_WRCREAT(),0640)) {
1595: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
1596: my $time=time;
1597: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
1598: my ($thentime,$idnum)=split(/\_/,$lastid);
1599: my $newid=$time.'_000000';
1600: if ($thentime==$time) {
1601: $idnum=~s/^0+//;
1602: $idnum++;
1603: $idnum=substr('000000'.$idnum,-6,6);
1604: $newid=$time.'_'.$idnum;
1605: }
1606: $hash{$newid}=$newchat;
1607: my $expired=$time-3600;
1608: foreach (keys %hash) {
1609: my ($thistime)=($_=~/(\d+)\_/);
1610: if ($thistime<$expired) {
1611: delete $hash{$_};
1612: }
1613: }
1614: untie %hash;
1615: }
1616: }
1617:
1618: sub unsub {
1619: my ($fname,$clientip)=@_;
1620: my $result;
1621: if (unlink("$fname.$hostid{$clientip}")) {
1622: $result="ok\n";
1623: } else {
1624: $result="not_subscribed\n";
1625: }
1626: if (-e "$fname.subscription") {
1627: my $found=&addline($fname,$hostid{$clientip},$clientip,'');
1628: if ($found) { $result="ok\n"; }
1629: } else {
1630: if ($result != "ok\n") { $result="not_subscribed\n"; }
1631: }
1632: return $result;
1633: }
1634:
1635: sub subscribe {
1636: my ($userinput,$clientip)=@_;
1637: my $result;
1638: my ($cmd,$fname)=split(/:/,$userinput);
1639: my $ownership=&ishome($fname);
1640: if ($ownership eq 'owner') {
1641: if (-e $fname) {
1642: if (-d $fname) {
1643: $result="directory\n";
1644: } else {
1645: if (-e "$fname.$hostid{$clientip}") {&unsub($fname,$clientip);}
1646: $now=time;
1647: my $found=&addline($fname,$hostid{$clientip},$clientip,
1648: "$hostid{$clientip}:$clientip:$now\n");
1649: if ($found) { $result="$fname\n"; }
1650: # if they were subscribed to only meta data, delete that
1651: # subscription, when you subscribe to a file you also get
1652: # the metadata
1653: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
1654: $fname=~s/\/home\/httpd\/html\/res/raw/;
1655: $fname="http://$thisserver/".$fname;
1656: $result="$fname\n";
1657: }
1658: } else {
1659: $result="not_found\n";
1660: }
1661: } else {
1662: $result="rejected\n";
1663: }
1664: return $result;
1665: }
1666: # ----------------------------------- POD (plain old documentation, CPAN style)
1667:
1668: =head1 NAME
1669:
1670: lond - "LON Daemon" Server (port "LOND" 5663)
1671:
1672: =head1 SYNOPSIS
1673:
1674: Usage: B<lond>
1675:
1676: Should only be run as user=www. This is a command-line script which
1677: is invoked by B<loncron>. There is no expectation that a typical user
1678: will manually start B<lond> from the command-line. (In other words,
1679: DO NOT START B<lond> YOURSELF.)
1680:
1681: =head1 DESCRIPTION
1682:
1683: There are two characteristics associated with the running of B<lond>,
1684: PROCESS MANAGEMENT (starting, stopping, handling child processes)
1685: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
1686: subscriptions, etc). These are described in two large
1687: sections below.
1688:
1689: B<PROCESS MANAGEMENT>
1690:
1691: Preforker - server who forks first. Runs as a daemon. HUPs.
1692: Uses IDEA encryption
1693:
1694: B<lond> forks off children processes that correspond to the other servers
1695: in the network. Management of these processes can be done at the
1696: parent process level or the child process level.
1697:
1698: B<logs/lond.log> is the location of log messages.
1699:
1700: The process management is now explained in terms of linux shell commands,
1701: subroutines internal to this code, and signal assignments:
1702:
1703: =over 4
1704:
1705: =item *
1706:
1707: PID is stored in B<logs/lond.pid>
1708:
1709: This is the process id number of the parent B<lond> process.
1710:
1711: =item *
1712:
1713: SIGTERM and SIGINT
1714:
1715: Parent signal assignment:
1716: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
1717:
1718: Child signal assignment:
1719: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
1720: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
1721: to restart a new child.)
1722:
1723: Command-line invocations:
1724: B<kill> B<-s> SIGTERM I<PID>
1725: B<kill> B<-s> SIGINT I<PID>
1726:
1727: Subroutine B<HUNTSMAN>:
1728: This is only invoked for the B<lond> parent I<PID>.
1729: This kills all the children, and then the parent.
1730: The B<lonc.pid> file is cleared.
1731:
1732: =item *
1733:
1734: SIGHUP
1735:
1736: Current bug:
1737: This signal can only be processed the first time
1738: on the parent process. Subsequent SIGHUP signals
1739: have no effect.
1740:
1741: Parent signal assignment:
1742: $SIG{HUP} = \&HUPSMAN;
1743:
1744: Child signal assignment:
1745: none (nothing happens)
1746:
1747: Command-line invocations:
1748: B<kill> B<-s> SIGHUP I<PID>
1749:
1750: Subroutine B<HUPSMAN>:
1751: This is only invoked for the B<lond> parent I<PID>,
1752: This kills all the children, and then the parent.
1753: The B<lond.pid> file is cleared.
1754:
1755: =item *
1756:
1757: SIGUSR1
1758:
1759: Parent signal assignment:
1760: $SIG{USR1} = \&USRMAN;
1761:
1762: Child signal assignment:
1763: $SIG{USR1}= \&logstatus;
1764:
1765: Command-line invocations:
1766: B<kill> B<-s> SIGUSR1 I<PID>
1767:
1768: Subroutine B<USRMAN>:
1769: When invoked for the B<lond> parent I<PID>,
1770: SIGUSR1 is sent to all the children, and the status of
1771: each connection is logged.
1772:
1773: =item *
1774:
1775: SIGCHLD
1776:
1777: Parent signal assignment:
1778: $SIG{CHLD} = \&REAPER;
1779:
1780: Child signal assignment:
1781: none
1782:
1783: Command-line invocations:
1784: B<kill> B<-s> SIGCHLD I<PID>
1785:
1786: Subroutine B<REAPER>:
1787: This is only invoked for the B<lond> parent I<PID>.
1788: Information pertaining to the child is removed.
1789: The socket port is cleaned up.
1790:
1791: =back
1792:
1793: B<SERVER-SIDE ACTIVITIES>
1794:
1795: Server-side information can be accepted in an encrypted or non-encrypted
1796: method.
1797:
1798: =over 4
1799:
1800: =item ping
1801:
1802: Query a client in the hosts.tab table; "Are you there?"
1803:
1804: =item pong
1805:
1806: Respond to a ping query.
1807:
1808: =item ekey
1809:
1810: Read in encrypted key, make cipher. Respond with a buildkey.
1811:
1812: =item load
1813:
1814: Respond with CPU load based on a computation upon /proc/loadavg.
1815:
1816: =item currentauth
1817:
1818: Reply with current authentication information (only over an
1819: encrypted channel).
1820:
1821: =item auth
1822:
1823: Only over an encrypted channel, reply as to whether a user's
1824: authentication information can be validated.
1825:
1826: =item passwd
1827:
1828: Allow for a password to be set.
1829:
1830: =item makeuser
1831:
1832: Make a user.
1833:
1834: =item passwd
1835:
1836: Allow for authentication mechanism and password to be changed.
1837:
1838: =item home
1839:
1840: Respond to a question "are you the home for a given user?"
1841:
1842: =item update
1843:
1844: Update contents of a subscribed resource.
1845:
1846: =item unsubscribe
1847:
1848: The server is unsubscribing from a resource.
1849:
1850: =item subscribe
1851:
1852: The server is subscribing to a resource.
1853:
1854: =item log
1855:
1856: Place in B<logs/lond.log>
1857:
1858: =item put
1859:
1860: stores hash in namespace
1861:
1862: =item rolesput
1863:
1864: put a role into a user's environment
1865:
1866: =item get
1867:
1868: returns hash with keys from array
1869: reference filled in from namespace
1870:
1871: =item eget
1872:
1873: returns hash with keys from array
1874: reference filled in from namesp (encrypts the return communication)
1875:
1876: =item rolesget
1877:
1878: get a role from a user's environment
1879:
1880: =item del
1881:
1882: deletes keys out of array from namespace
1883:
1884: =item keys
1885:
1886: returns namespace keys
1887:
1888: =item dump
1889:
1890: dumps the complete (or key matching regexp) namespace into a hash
1891:
1892: =item store
1893:
1894: stores hash permanently
1895: for this url; hashref needs to be given and should be a \%hashname; the
1896: remaining args aren't required and if they aren't passed or are '' they will
1897: be derived from the ENV
1898:
1899: =item restore
1900:
1901: returns a hash for a given url
1902:
1903: =item querysend
1904:
1905: Tells client about the lonsql process that has been launched in response
1906: to a sent query.
1907:
1908: =item queryreply
1909:
1910: Accept information from lonsql and make appropriate storage in temporary
1911: file space.
1912:
1913: =item idput
1914:
1915: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
1916: for each student, defined perhaps by the institutional Registrar.)
1917:
1918: =item idget
1919:
1920: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
1921: for each student, defined perhaps by the institutional Registrar.)
1922:
1923: =item tmpput
1924:
1925: Accept and store information in temporary space.
1926:
1927: =item tmpget
1928:
1929: Send along temporarily stored information.
1930:
1931: =item ls
1932:
1933: List part of a user's directory.
1934:
1935: =item Hanging up (exit or init)
1936:
1937: What to do when a client tells the server that they (the client)
1938: are leaving the network.
1939:
1940: =item unknown command
1941:
1942: If B<lond> is sent an unknown command (not in the list above),
1943: it replys to the client "unknown_cmd".
1944:
1945: =item UNKNOWN CLIENT
1946:
1947: If the anti-spoofing algorithm cannot verify the client,
1948: the client is rejected (with a "refused" message sent
1949: to the client, and the connection is closed.
1950:
1951: =back
1952:
1953: =head1 PREREQUISITES
1954:
1955: IO::Socket
1956: IO::File
1957: Apache::File
1958: Symbol
1959: POSIX
1960: Crypt::IDEA
1961: LWP::UserAgent()
1962: GDBM_File
1963: Authen::Krb4
1964:
1965: =head1 COREQUISITES
1966:
1967: =head1 OSNAMES
1968:
1969: linux
1970:
1971: =head1 SCRIPT CATEGORIES
1972:
1973: Server/Process
1974:
1975: =cut
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