1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.70 2005/10/24 21:32:42 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:
44: my %FORM;
45:
46: # ------------------------------------------------------------ Successful login
47:
48: sub success {
49: my ($r, $username, $domain, $authhost,$lowerurl) = @_;
50: my $lonids=$r->dir_config('lonIDsDir');
51:
52: my $public=($username eq 'public' && $domain eq 'public');
53:
54: # See if old ID present, if so, remove
55:
56: my ($filename,$cookie,$userroles);
57: my $now=time;
58:
59: if ($public) {
60: my $max_public=100;
61: my $oldest;
62: my $oldest_time=0;
63: for(my $next=1;$next<=$max_public;$next++) {
64: if (-e $lonids."/publicuser_$next.id") {
65: my $mtime=(stat($lonids."/publicuser_$next.id"))[9];
66: if ($mtime<$oldest_time || !$oldest_time) {
67: $oldest_time=$mtime;
68: $oldest=$next;
69: }
70: } else {
71: $cookie="publicuser_$next";
72: last;
73: }
74: }
75: if (!$cookie) { $cookie="publicuser_$oldest"; }
76: } else {
77: opendir(DIR,$lonids);
78: while ($filename=readdir(DIR)) {
79: if ($filename=~/^$username\_\d+\_$domain\_$authhost\.id$/) {
80: unlink($lonids.'/'.$filename);
81: }
82: }
83: closedir(DIR);
84:
85: # Give them a new cookie
86:
87: $cookie="$username\_$now\_$domain\_$authhost";
88:
89: # Initialize roles
90:
91: $userroles=Apache::lonnet::rolesinit($domain,$username,$authhost);
92: }
93: # ------------------------------------ Check browser type and MathML capability
94:
95: my ($httpbrowser,$clientbrowser,$clientversion,$clientmathml,
96: $clientunicode,$clientos) = &Apache::loncommon::decode_user_agent($r);
97:
98: # -------------------------------------- Any accessibility options to remember?
99: if (($FORM{'interface'}) && ($FORM{'remember'} eq 'true')) {
100: foreach ('imagesuppress','appletsuppress',
101: 'embedsuppress','fontenhance','blackwhite') {
102: if ($FORM{$_} eq 'true') {
103: &Apache::lonnet::put('environment',{$_ => 'on'},
104: $domain,$username);
105: } else {
106: &Apache::lonnet::del('environment',[$_],$domain,$username);
107: }
108: }
109: }
110: # ------------------------------------------------------------- Get environment
111:
112: my $userenv;
113: my %userenv=Apache::lonnet::dump('environment',$domain,$username);
114: my ($tmp) = keys(%userenv);
115: if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
116: foreach my $key (keys(%userenv)) {
117: $userenv.="environment.$key=$userenv{$key}\n";
118: }
119: }
120: if (($userenv{'interface'}) && (!$FORM{'interface'})) {
121: $FORM{'interface'}=$userenv{'interface'};
122: }
123: $env{'environment.remote'}=$userenv{'remote'};
124: if ($userenv{'texengine'} eq 'ttm') { $clientmathml=1; }
125:
126: # --------------- Do not trust query string to be put directly into environment
127: foreach ('imagesuppress','appletsuppress',
128: 'embedsuppress','fontenhance','blackwhite',
129: 'interface','localpath','localres') {
130: $FORM{$_}=~s/[\n\r\=]//gs;
131: }
132: # --------------------------------------------------------- Write first profile
133:
134: {
135: my $idf=Apache::File->new(">$lonids/$cookie.id");
136: unless (flock($idf,LOCK_EX)) {
137: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
138: 'Could not obtain exclusive lock in lonauth: '.$!);
139: $idf->close();
140: return 'error: '.$!;
141: }
142: if ($userenv ne '') { print $idf "$userenv\n"; }
143: print $idf "user.name=$username\n";
144: print $idf "user.domain=$domain\n";
145: print $idf "user.home=$authhost\n";
146: print $idf "browser.type=$clientbrowser\n";
147: print $idf "browser.version=$clientversion\n";
148: print $idf "browser.mathml=$clientmathml\n";
149: print $idf "browser.unicode=$clientunicode\n";
150: print $idf "browser.os=$clientos\n";
151: if ($FORM{'localpath'}) {
152: print $idf "browser.localpath=$FORM{'localpath'}\n";
153: print $idf "browser.localres=$FORM{'localres'}\n";
154: }
155: print $idf "request.course.fn=\n";
156: print $idf "request.course.uri=\n";
157: print $idf "request.course.sec=\n";
158: print $idf "request.role=cm\n";
159: print $idf "request.role.adv=$env{'user.adv'}\n";
160: print $idf "request.host=$ENV{'REMOTE_ADDR'}\n";
161: if ($public) {
162: print $idf "environment.remote=off\n";
163: }
164: if ($FORM{'interface'}) {
165: $FORM{'interface'}=~s/\W//gs;
166: print $idf "browser.interface=$FORM{'interface'}\n";
167: $env{'browser.interface'}=$FORM{'interface'};
168: foreach ('imagesuppress','appletsuppress',
169: 'embedsuppress','fontenhance','blackwhite') {
170: if (($FORM{$_} eq 'true') ||
171: ($userenv{$_} eq 'on')) {
172: print $idf "browser.$_=on\n";
173: }
174: }
175: }
176: if ($userroles ne '') { print $idf "$userroles"; }
177: $idf->close();
178: }
179: $env{'request.role'}='cm';
180: $env{'request.role.adv'}=$env{'user.adv'};
181: $env{'browser.type'}=$clientbrowser;
182: # -------------------------------------------------------------------- Log this
183:
184: &Apache::lonnet::log($domain,$username,$authhost,
185: "Login $ENV{'REMOTE_ADDR'}");
186:
187: # ------------------------------------------------- Check for critical messages
188:
189: my @what=&Apache::lonnet::dump('critical',$domain,$username);
190: if ($what[0]) {
191: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
192: $lowerurl='/adm/email?critical=display';
193: }
194: }
195:
196: # ------------------------------------------------------------ Get cookie ready
197:
198: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
199:
200: $cookie="lonID=$cookie; path=/";
201: # -------------------------------------------------------- Menu script and info
202: my $windowinfo=&Apache::lonmenu::open($clientos);
203: my $startupremote=&Apache::lonmenu::startupremote($lowerurl);
204: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
205: my $setflags=&Apache::lonmenu::setflags();
206: my $maincall=&Apache::lonmenu::maincall();
207: my $bodytag=&Apache::loncommon::bodytag('Successful Login');
208: my $add=&addcontent();
209: my $continuelink;
210: if (($env{'browser.interface'} eq 'textual') ||
211: ($env{'environment.remote'} eq 'off')) {
212: $continuelink="<a href=\"$lowerurl\">".&mt('Continue')."</a>";
213: }
214: # ------------------------------------------------- Output for successful login
215:
216: $r->send_cgi_header(<<ENDHEADER);
217: Content-type: text/html$add
218: Set-cookie: $cookie
219:
220: ENDHEADER
221: my %lt=&Apache::lonlocal::texthash(
222: 'wel' => 'Welcome',
223: 'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up',
224: 'pro' => 'Problems',
225: 'log' => 'loginproblems.html',
226: );
227: $r->print(<<ENDSUCCESS);
228: <html>
229: <head>
230: <title>Successful Login to the LearningOnline Network with CAPA</title>
231: $startupremote
232: </head>
233: $bodytag
234: $setflags
235: $windowinfo
236: <h1>$lt{'wel'}</h1>
237: $lt{'mes'}.<p>
238: <a href="/adm/$lt{'log'}">$lt{'pro'}?</a></p>
239: $remoteinfo
240: $maincall
241: $continuelink
242: </body>
243: </html>
244: ENDSUCCESS
245: }
246:
247: # --------------------------------------------------------------- Failed login!
248:
249: sub failed {
250: my ($r,$message) = @_;
251: my $bodytag=&Apache::loncommon::bodytag('Unsuccessful Login');
252: my $add=&addcontent();
253: $r->send_cgi_header(<<ENDFHEADER);
254: Content-type: text/html$add
255:
256: ENDFHEADER
257: $r->print(<<ENDFAILED);
258: <html>
259: <head>
260: <title>Unsuccessful Login to the LearningOnline Network with CAPA</title>
261: </head>
262: $bodytag
263: <h1>Sorry ...</h1>
264: <p><b>$message</b></p>
265: <p>Please <a href="/adm/login?username=$FORM{'uname'}&domain=$FORM{'udom'}">log in again</a>.</p>
266: <p>
267: <a href="/adm/loginproblems.html">Problems?</a></p>
268: </body>
269: </html>
270: ENDFAILED
271: }
272:
273: # --------------------------------------------------------------------- Charset
274:
275: sub addcontent {
276: my $encoding=&Apache::lonlocal::current_encoding;
277: if ($encoding) {
278: return '; charset='.$encoding;
279: } else {
280: return '';
281: }
282: }
283:
284: # ------------------------------------------------------------------ Rerouting!
285:
286: sub reroute {
287: my $r=shift;
288: my $bodytag=&Apache::loncommon::bodytag('Rerouting');
289: $r->send_cgi_header(<<ENDRFHEADER);
290: Content-type: text/html
291:
292: ENDRFHEADER
293: $r->print(<<ENDRFAILED);
294: <html>
295: <head>
296: <title>Rerouting Login to the LearningOnline Network with CAPA</title>
297: </head>
298: $bodytag
299: <h1>Sorry ...</h1>
300: Please <a href="/">log in again</a>.
301: </body>
302: </html>
303: ENDRFAILED
304: }
305:
306: # ---------------------------------------------------------------- Main handler
307:
308: sub handler {
309: my $r = shift;
310:
311: # Are we re-routing?
312: if (-e '/home/httpd/html/lon-status/reroute.txt') {
313: &reroute($r);
314: return OK;
315: }
316:
317: &Apache::lonlocal::get_language_handle($r);
318:
319: # -------------------------------- Prevent users from attempting to login twice
320: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
321: my $lonid=$cookies{'lonID'};
322: my $cookie;
323: if ($lonid) {
324: my $handle=$lonid->value;
325: $handle=~s/\W//g;
326: my $lonidsdir=$r->dir_config('lonIDsDir');
327: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
328: # Indeed, a valid token is found
329: $r->send_cgi_header(<<ENDFHEADER);
330: Content-type: text/html
331:
332: ENDFHEADER
333: my $bodytag=&Apache::loncommon::bodytag('Already logged in');
334: $r->print(<<ENDFAILED);
335: <html>
336: <head>
337: <title>Already logged in</title>
338: </head>
339: $bodytag
340: <h1>You are already logged in</h1>
341: <p>Please either <a href="/adm/roles">continue the current session</a> or
342: <a href="/adm/logout">logout</a>.</p>
343: <p>
344: <a href="/adm/loginproblems.html">Problems?</a></p>
345: </body>
346: </html>
347: ENDFAILED
348: return OK;
349: }
350: }
351:
352: # ---------------------------------------------------- No valid token, continue
353:
354:
355: my $buffer;
356: $r->read($buffer,$r->header_in('Content-length'),0);
357: my @pairs=split(/&/,$buffer);
358: my $pair; my $name; my $value;
359: undef %FORM;
360: %FORM=();
361: foreach $pair (@pairs) {
362: ($name,$value) = split(/=/,$pair);
363: $value =~ tr/+/ /;
364: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
365: $FORM{$name}=$value;
366: }
367:
368: if ((!$FORM{'uname'}) || (!$FORM{'upass0'}) || (!$FORM{'udom'})) {
369: failed($r,'Username, password and domain need to be specified.');
370: return OK;
371: }
372:
373: # split user logging in and "su"-user
374:
375: ($FORM{'uname'},$FORM{'suname'})=split(/\:/,$FORM{'uname'});
376: $FORM{'uname'} =~ s/\W//g;
377: $FORM{'suname'} =~ s/\W//g;
378: $FORM{'udom'} =~ s/\W//g;
379:
380: my $role = $r->dir_config('lonRole');
381: my $domain = $r->dir_config('lonDefDomain');
382: my $prodir = $r->dir_config('lonUsersDir');
383:
384: # ---------------------------------------- Get the information from login token
385:
386: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$FORM{'logtoken'},
387: $FORM{'serverid'});
388:
389: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
390: failed($r,'Information needed to verify your login information is missing, inaccessible or expired.');
391: return OK;
392: } else {
393: unless (&Apache::lonnet::reply('tmpdel:'.$FORM{'logtoken'},
394: $FORM{'serverid'}) eq 'ok') {
395: &failed($r,'Session could not be opened.');
396: }
397: }
398: my ($key,$firsturl)=split(/&/,$tmpinfo);
399:
400: my $keybin=pack("H16",$key);
401:
402: my $cipher;
403: if ($Crypt::DES::VERSION>=2.03) {
404: $cipher=new Crypt::DES $keybin;
405: }
406: else {
407: $cipher=new DES $keybin;
408: }
409: my $upass='';
410: for (my $i=0;$i<=2;$i++) {
411: my $chunk=
412: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},0,16))));
413:
414: $chunk.=
415: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},16,16))));
416:
417: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
418: $upass.=$chunk;
419: }
420:
421: # ---------------------------------------------------------------- Authenticate
422: my $authhost=Apache::lonnet::authenticate($FORM{'uname'},
423: $upass,
424: $FORM{'udom'});
425:
426: # --------------------------------------------------------------------- Failed?
427:
428: if ($authhost eq 'no_host') {
429: failed($r,'Username and/or password could not be authenticated.');
430: return OK;
431: }
432:
433: if (($firsturl eq '') ||
434: ($firsturl=~/^\/adm\/(logout|remote)/)) {
435: $firsturl='/adm/roles';
436: }
437: # --------------------------------- Are we attempting to login as somebody else?
438: if ($FORM{'suname'}) {
439: # ------------ see if the original user has enough privileges to pull this stunt
440: if (&Apache::lonnet::privileged($FORM{'uname'},$FORM{'udom'})) {
441: # ---------------------------------------------------- see if the su-user exists
442: unless (&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'})
443: eq 'no_host') {
444: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'}));
445: # ------------------------------ see if the su-user is not too highly privileged
446: unless (&Apache::lonnet::privileged($FORM{'suname'},$FORM{'udom'})) {
447: # -------------------------------------------------------- actually switch users
448: &Apache::lonnet::logperm('User '.$FORM{'uname'}.' at '.$FORM{'udom'}.
449: ' logging in as '.$FORM{'suname'});
450: $FORM{'uname'}=$FORM{'suname'};
451: } else {
452: &Apache::lonnet::logthis('Attempted switch user to privileged user');
453: }
454: }
455: } else {
456: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
457: }
458: }
459: &success($r,$FORM{'uname'},$FORM{'udom'},$authhost,$firsturl);
460: return OK;
461: }
462:
463: 1;
464: __END__
465:
466:
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