1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.73 2006/01/19 22:14:38 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28:
29: package Apache::lonauth;
30:
31: use strict;
32: use Apache::Constants qw(:common);
33: use Apache::File;
34: use CGI qw(:standard);
35: use CGI::Cookie();
36: use DynaLoader; # for Crypt::DES version
37: use Crypt::DES;
38: use Apache::loncommon();
39: use Apache::lonnet;
40: use Apache::lonmenu();
41: use Fcntl qw(:flock);
42: use Apache::lonlocal;
43: use POSIX qw(strftime);
44:
45: my %FORM;
46:
47: # ------------------------------------------------------------ Successful login
48:
49: sub success {
50: my ($r, $username, $domain, $authhost,$lowerurl) = @_;
51: my $lonids=$r->dir_config('lonIDsDir');
52:
53: my $public=($username eq 'public' && $domain eq 'public');
54:
55: # See if old ID present, if so, remove
56:
57: my ($filename,$cookie,$userroles);
58: my $now=time;
59:
60: if ($public) {
61: my $max_public=100;
62: my $oldest;
63: my $oldest_time=0;
64: for(my $next=1;$next<=$max_public;$next++) {
65: if (-e $lonids."/publicuser_$next.id") {
66: my $mtime=(stat($lonids."/publicuser_$next.id"))[9];
67: if ($mtime<$oldest_time || !$oldest_time) {
68: $oldest_time=$mtime;
69: $oldest=$next;
70: }
71: } else {
72: $cookie="publicuser_$next";
73: last;
74: }
75: }
76: if (!$cookie) { $cookie="publicuser_$oldest"; }
77: } else {
78: opendir(DIR,$lonids);
79: while ($filename=readdir(DIR)) {
80: if ($filename=~/^$username\_\d+\_$domain\_$authhost\.id$/) {
81: unlink($lonids.'/'.$filename);
82: }
83: }
84: closedir(DIR);
85:
86: # Give them a new cookie
87:
88: $cookie="$username\_$now\_$domain\_$authhost";
89:
90: # Initialize roles
91:
92: $userroles=Apache::lonnet::rolesinit($domain,$username,$authhost);
93: }
94: # ------------------------------------ Check browser type and MathML capability
95:
96: my ($httpbrowser,$clientbrowser,$clientversion,$clientmathml,
97: $clientunicode,$clientos) = &Apache::loncommon::decode_user_agent($r);
98:
99: # -------------------------------------- Any accessibility options to remember?
100: if (($FORM{'interface'}) && ($FORM{'remember'} eq 'true')) {
101: foreach ('imagesuppress','appletsuppress',
102: 'embedsuppress','fontenhance','blackwhite') {
103: if ($FORM{$_} eq 'true') {
104: &Apache::lonnet::put('environment',{$_ => 'on'},
105: $domain,$username);
106: } else {
107: &Apache::lonnet::del('environment',[$_],$domain,$username);
108: }
109: }
110: }
111: # ------------------------------------------------------------- Get environment
112:
113: my $userenv;
114: my %userenv=Apache::lonnet::dump('environment',$domain,$username);
115: my ($tmp) = keys(%userenv);
116: if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
117: # default remote control to off
118: if ($userenv{'remote'} ne 'on') { $userenv{'remote'} = 'off'; }
119: foreach my $key (keys(%userenv)) {
120: $userenv.="environment.$key=$userenv{$key}\n";
121: }
122: }
123: if (($userenv{'interface'}) && (!$FORM{'interface'})) {
124: $FORM{'interface'}=$userenv{'interface'};
125: }
126: $env{'environment.remote'}=$userenv{'remote'};
127: if ($userenv{'texengine'} eq 'ttm') { $clientmathml=1; }
128:
129: # --------------- Do not trust query string to be put directly into environment
130: foreach ('imagesuppress','appletsuppress',
131: 'embedsuppress','fontenhance','blackwhite',
132: 'interface','localpath','localres') {
133: $FORM{$_}=~s/[\n\r\=]//gs;
134: }
135: # --------------------------------------------------------- Write first profile
136:
137: {
138: my $idf=Apache::File->new(">$lonids/$cookie.id");
139: unless (flock($idf,LOCK_EX)) {
140: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
141: 'Could not obtain exclusive lock in lonauth: '.$!);
142: $idf->close();
143: return 'error: '.$!;
144: }
145: if ($userenv ne '') { print $idf "$userenv\n"; }
146: print $idf "user.name=$username\n";
147: print $idf "user.domain=$domain\n";
148: print $idf "user.home=$authhost\n";
149: print $idf "browser.type=$clientbrowser\n";
150: print $idf "browser.version=$clientversion\n";
151: print $idf "browser.mathml=$clientmathml\n";
152: print $idf "browser.unicode=$clientunicode\n";
153: print $idf "browser.os=$clientos\n";
154: if ($FORM{'localpath'}) {
155: print $idf "browser.localpath=$FORM{'localpath'}\n";
156: print $idf "browser.localres=$FORM{'localres'}\n";
157: }
158: print $idf "server.domain=".$r->dir_config('lonDefDomain')."\n";
159: my $timezone=POSIX::strftime("%Z",localtime(time));
160: print $idf "server.timezone=$timezone\n";
161: print $idf "request.course.fn=\n";
162: print $idf "request.course.uri=\n";
163: print $idf "request.course.sec=\n";
164: print $idf "request.role=cm\n";
165: print $idf "request.role.adv=$env{'user.adv'}\n";
166: print $idf "request.host=$ENV{'REMOTE_ADDR'}\n";
167: if ($public) {
168: print $idf "environment.remote=off\n";
169: }
170: if ($FORM{'interface'}) {
171: $FORM{'interface'}=~s/\W//gs;
172: print $idf "browser.interface=$FORM{'interface'}\n";
173: $env{'browser.interface'}=$FORM{'interface'};
174: foreach ('imagesuppress','appletsuppress',
175: 'embedsuppress','fontenhance','blackwhite') {
176: if (($FORM{$_} eq 'true') ||
177: ($userenv{$_} eq 'on')) {
178: print $idf "browser.$_=on\n";
179: }
180: }
181: }
182: if ($userroles ne '') { print $idf "$userroles"; }
183: $idf->close();
184: }
185: $env{'request.role'}='cm';
186: $env{'request.role.adv'}=$env{'user.adv'};
187: $env{'browser.type'}=$clientbrowser;
188: # -------------------------------------------------------------------- Log this
189:
190: &Apache::lonnet::log($domain,$username,$authhost,
191: "Login $ENV{'REMOTE_ADDR'}");
192:
193: # ------------------------------------------------- Check for critical messages
194:
195: my @what=&Apache::lonnet::dump('critical',$domain,$username);
196: if ($what[0]) {
197: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
198: $lowerurl='/adm/email?critical=display';
199: }
200: }
201:
202: # ------------------------------------------------------------ Get cookie ready
203:
204: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
205:
206: $cookie="lonID=$cookie; path=/";
207: # -------------------------------------------------------- Menu script and info
208: my $windowinfo=&Apache::lonmenu::open($clientos);
209: my $startupremote=&Apache::lonmenu::startupremote($lowerurl);
210: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
211: my $setflags=&Apache::lonmenu::setflags();
212: my $maincall=&Apache::lonmenu::maincall();
213: my $bodytag=&Apache::loncommon::bodytag('Successful Login');
214: my $add=&addcontent();
215: my $continuelink;
216: if (($env{'browser.interface'} eq 'textual') ||
217: ($env{'environment.remote'} eq 'off')) {
218: $continuelink="<a href=\"$lowerurl\">".&mt('Continue')."</a>";
219: }
220: # ------------------------------------------------- Output for successful login
221:
222: $r->send_cgi_header(<<ENDHEADER);
223: Content-type: text/html$add
224: Set-cookie: $cookie
225:
226: ENDHEADER
227: my %lt=&Apache::lonlocal::texthash(
228: 'wel' => 'Welcome',
229: 'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up',
230: 'pro' => 'Problems',
231: 'log' => 'loginproblems.html',
232: );
233: $r->print(<<ENDSUCCESS);
234: <html>
235: <head>
236: <title>Successful Login to the LearningOnline Network with CAPA</title>
237: $startupremote
238: </head>
239: $bodytag
240: $setflags
241: $windowinfo
242: <h1>$lt{'wel'}</h1>
243: $lt{'mes'}.<p>
244: <a href="/adm/$lt{'log'}">$lt{'pro'}?</a></p>
245: $remoteinfo
246: $maincall
247: $continuelink
248: </body>
249: </html>
250: ENDSUCCESS
251: }
252:
253: # --------------------------------------------------------------- Failed login!
254:
255: sub failed {
256: my ($r,$message) = @_;
257: my $bodytag=&Apache::loncommon::bodytag('Unsuccessful Login');
258: my $add=&addcontent();
259: $r->send_cgi_header(<<ENDFHEADER);
260: Content-type: text/html$add
261:
262: ENDFHEADER
263: $r->print(<<ENDFAILED);
264: <html>
265: <head>
266: <title>Unsuccessful Login to the LearningOnline Network with CAPA</title>
267: </head>
268: $bodytag
269: <h1>Sorry ...</h1>
270: <p><b>$message</b></p>
271: <p>Please <a href="/adm/login?username=$FORM{'uname'}&domain=$FORM{'udom'}">log in again</a>.</p>
272: <p>
273: <a href="/adm/loginproblems.html">Problems?</a></p>
274: </body>
275: </html>
276: ENDFAILED
277: }
278:
279: # --------------------------------------------------------------------- Charset
280:
281: sub addcontent {
282: my $encoding=&Apache::lonlocal::current_encoding;
283: if ($encoding) {
284: return '; charset='.$encoding;
285: } else {
286: return '';
287: }
288: }
289:
290: # ------------------------------------------------------------------ Rerouting!
291:
292: sub reroute {
293: my $r=shift;
294: my $bodytag=&Apache::loncommon::bodytag('Rerouting');
295: $r->send_cgi_header(<<ENDRFHEADER);
296: Content-type: text/html
297:
298: ENDRFHEADER
299: $r->print(<<ENDRFAILED);
300: <html>
301: <head>
302: <title>Rerouting Login to the LearningOnline Network with CAPA</title>
303: </head>
304: $bodytag
305: <h1>Sorry ...</h1>
306: Please <a href="/">log in again</a>.
307: </body>
308: </html>
309: ENDRFAILED
310: }
311:
312: # ---------------------------------------------------------------- Main handler
313:
314: sub handler {
315: my $r = shift;
316:
317: # Are we re-routing?
318: if (-e '/home/httpd/html/lon-status/reroute.txt') {
319: &reroute($r);
320: return OK;
321: }
322:
323: &Apache::lonlocal::get_language_handle($r);
324:
325: # -------------------------------- Prevent users from attempting to login twice
326: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
327: my $lonid=$cookies{'lonID'};
328: my $cookie;
329: if ($lonid) {
330: my $handle=$lonid->value;
331: $handle=~s/\W//g;
332: my $lonidsdir=$r->dir_config('lonIDsDir');
333: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
334: # Indeed, a valid token is found
335: $r->send_cgi_header(<<ENDFHEADER);
336: Content-type: text/html
337:
338: ENDFHEADER
339: my $bodytag=&Apache::loncommon::bodytag('Already logged in');
340: $r->print(<<ENDFAILED);
341: <html>
342: <head>
343: <title>Already logged in</title>
344: </head>
345: $bodytag
346: <h1>You are already logged in</h1>
347: <p>Please either <a href="/adm/roles">continue the current session</a> or
348: <a href="/adm/logout">logout</a>.</p>
349: <p>
350: <a href="/adm/loginproblems.html">Problems?</a></p>
351: </body>
352: </html>
353: ENDFAILED
354: return OK;
355: }
356: }
357:
358: # ---------------------------------------------------- No valid token, continue
359:
360:
361: my $buffer;
362: $r->read($buffer,$r->header_in('Content-length'),0);
363: my @pairs=split(/&/,$buffer);
364: my $pair; my $name; my $value;
365: undef %FORM;
366: %FORM=();
367: foreach $pair (@pairs) {
368: ($name,$value) = split(/=/,$pair);
369: $value =~ tr/+/ /;
370: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
371: $FORM{$name}=$value;
372: }
373:
374: if ((!$FORM{'uname'}) || (!$FORM{'upass0'}) || (!$FORM{'udom'})) {
375: failed($r,'Username, password and domain need to be specified.');
376: return OK;
377: }
378:
379: # split user logging in and "su"-user
380:
381: ($FORM{'uname'},$FORM{'suname'})=split(/\:/,$FORM{'uname'});
382: $FORM{'uname'} =~ s/\W//g;
383: $FORM{'suname'} =~ s/\W//g;
384: $FORM{'udom'} =~ s/\W//g;
385:
386: my $role = $r->dir_config('lonRole');
387: my $domain = $r->dir_config('lonDefDomain');
388: my $prodir = $r->dir_config('lonUsersDir');
389:
390: # ---------------------------------------- Get the information from login token
391:
392: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$FORM{'logtoken'},
393: $FORM{'serverid'});
394:
395: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
396: failed($r,'Information needed to verify your login information is missing, inaccessible or expired.');
397: return OK;
398: } else {
399: unless (&Apache::lonnet::reply('tmpdel:'.$FORM{'logtoken'},
400: $FORM{'serverid'}) eq 'ok') {
401: &failed($r,'Session could not be opened.');
402: }
403: }
404: my ($key,$firsturl)=split(/&/,$tmpinfo);
405:
406: my $keybin=pack("H16",$key);
407:
408: my $cipher;
409: if ($Crypt::DES::VERSION>=2.03) {
410: $cipher=new Crypt::DES $keybin;
411: }
412: else {
413: $cipher=new DES $keybin;
414: }
415: my $upass='';
416: for (my $i=0;$i<=2;$i++) {
417: my $chunk=
418: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},0,16))));
419:
420: $chunk.=
421: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},16,16))));
422:
423: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
424: $upass.=$chunk;
425: }
426:
427: # ---------------------------------------------------------------- Authenticate
428: my $authhost=Apache::lonnet::authenticate($FORM{'uname'},
429: $upass,
430: $FORM{'udom'});
431:
432: # --------------------------------------------------------------------- Failed?
433:
434: if ($authhost eq 'no_host') {
435: failed($r,'Username and/or password could not be authenticated.');
436: return OK;
437: }
438:
439: if (($firsturl eq '') ||
440: ($firsturl=~/^\/adm\/(logout|remote)/)) {
441: $firsturl='/adm/roles';
442: }
443: # --------------------------------- Are we attempting to login as somebody else?
444: if ($FORM{'suname'}) {
445: # ------------ see if the original user has enough privileges to pull this stunt
446: if (&Apache::lonnet::privileged($FORM{'uname'},$FORM{'udom'})) {
447: # ---------------------------------------------------- see if the su-user exists
448: unless (&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'})
449: eq 'no_host') {
450: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'}));
451: # ------------------------------ see if the su-user is not too highly privileged
452: unless (&Apache::lonnet::privileged($FORM{'suname'},$FORM{'udom'})) {
453: # -------------------------------------------------------- actually switch users
454: &Apache::lonnet::logperm('User '.$FORM{'uname'}.' at '.$FORM{'udom'}.
455: ' logging in as '.$FORM{'suname'});
456: $FORM{'uname'}=$FORM{'suname'};
457: } else {
458: &Apache::lonnet::logthis('Attempted switch user to privileged user');
459: }
460: }
461: } else {
462: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
463: }
464: }
465: &success($r,$FORM{'uname'},$FORM{'udom'},$authhost,$firsturl);
466: return OK;
467: }
468:
469: 1;
470: __END__
471:
472:
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