1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.69 2005/07/07 06:18:37 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) { return $cookie; }
199: $cookie="lonID=$cookie; path=/";
200: # -------------------------------------------------------- Menu script and info
201: my $windowinfo=&Apache::lonmenu::open($clientos);
202: my $startupremote=&Apache::lonmenu::startupremote($lowerurl);
203: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
204: my $setflags=&Apache::lonmenu::setflags();
205: my $maincall=&Apache::lonmenu::maincall();
206: my $bodytag=&Apache::loncommon::bodytag('Successful Login');
207: my $add=&addcontent();
208: my $continuelink;
209: if (($env{'browser.interface'} eq 'textual') ||
210: ($env{'environment.remote'} eq 'off')) {
211: $continuelink="<a href=\"$lowerurl\">".&mt('Continue')."</a>";
212: }
213: # ------------------------------------------------- Output for successful login
214:
215: $r->send_cgi_header(<<ENDHEADER);
216: Content-type: text/html$add
217: Set-cookie: $cookie
218:
219: ENDHEADER
220: my %lt=&Apache::lonlocal::texthash(
221: 'wel' => 'Welcome',
222: 'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up',
223: 'pro' => 'Problems',
224: 'log' => 'loginproblems.html',
225: );
226: $r->print(<<ENDSUCCESS);
227: <html>
228: <head>
229: <title>Successful Login to the LearningOnline Network with CAPA</title>
230: $startupremote
231: </head>
232: $bodytag
233: $setflags
234: $windowinfo
235: <h1>$lt{'wel'}</h1>
236: $lt{'mes'}.<p>
237: <a href="/adm/$lt{'log'}">$lt{'pro'}?</a></p>
238: $remoteinfo
239: $maincall
240: $continuelink
241: </body>
242: </html>
243: ENDSUCCESS
244: }
245:
246: # --------------------------------------------------------------- Failed login!
247:
248: sub failed {
249: my ($r,$message) = @_;
250: my $bodytag=&Apache::loncommon::bodytag('Unsuccessful Login');
251: my $add=&addcontent();
252: $r->send_cgi_header(<<ENDFHEADER);
253: Content-type: text/html$add
254:
255: ENDFHEADER
256: $r->print(<<ENDFAILED);
257: <html>
258: <head>
259: <title>Unsuccessful Login to the LearningOnline Network with CAPA</title>
260: </head>
261: $bodytag
262: <h1>Sorry ...</h1>
263: <p><b>$message</b></p>
264: <p>Please <a href="/adm/login?username=$FORM{'uname'}&domain=$FORM{'udom'}">log in again</a>.</p>
265: <p>
266: <a href="/adm/loginproblems.html">Problems?</a></p>
267: </body>
268: </html>
269: ENDFAILED
270: }
271:
272: # --------------------------------------------------------------------- Charset
273:
274: sub addcontent {
275: my $encoding=&Apache::lonlocal::current_encoding;
276: if ($encoding) {
277: return '; charset='.$encoding;
278: } else {
279: return '';
280: }
281: }
282:
283: # ------------------------------------------------------------------ Rerouting!
284:
285: sub reroute {
286: my $r=shift;
287: my $bodytag=&Apache::loncommon::bodytag('Rerouting');
288: $r->send_cgi_header(<<ENDRFHEADER);
289: Content-type: text/html
290:
291: ENDRFHEADER
292: $r->print(<<ENDRFAILED);
293: <html>
294: <head>
295: <title>Rerouting Login to the LearningOnline Network with CAPA</title>
296: </head>
297: $bodytag
298: <h1>Sorry ...</h1>
299: Please <a href="/">log in again</a>.
300: </body>
301: </html>
302: ENDRFAILED
303: }
304:
305: # ---------------------------------------------------------------- Main handler
306:
307: sub handler {
308: my $r = shift;
309:
310: # Are we re-routing?
311: if (-e '/home/httpd/html/lon-status/reroute.txt') {
312: &reroute($r);
313: return OK;
314: }
315:
316: &Apache::lonlocal::get_language_handle($r);
317:
318: # -------------------------------- Prevent users from attempting to login twice
319: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
320: my $lonid=$cookies{'lonID'};
321: my $cookie;
322: if ($lonid) {
323: my $handle=$lonid->value;
324: $handle=~s/\W//g;
325: my $lonidsdir=$r->dir_config('lonIDsDir');
326: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
327: # Indeed, a valid token is found
328: $r->send_cgi_header(<<ENDFHEADER);
329: Content-type: text/html
330:
331: ENDFHEADER
332: my $bodytag=&Apache::loncommon::bodytag('Already logged in');
333: $r->print(<<ENDFAILED);
334: <html>
335: <head>
336: <title>Already logged in</title>
337: </head>
338: $bodytag
339: <h1>You are already logged in</h1>
340: <p>Please either <a href="/adm/roles">continue the current session</a> or
341: <a href="/adm/logout">logout</a>.</p>
342: <p>
343: <a href="/adm/loginproblems.html">Problems?</a></p>
344: </body>
345: </html>
346: ENDFAILED
347: return OK;
348: }
349: }
350:
351: # ---------------------------------------------------- No valid token, continue
352:
353:
354: my $buffer;
355: $r->read($buffer,$r->header_in('Content-length'),0);
356: my @pairs=split(/&/,$buffer);
357: my $pair; my $name; my $value;
358: undef %FORM;
359: %FORM=();
360: foreach $pair (@pairs) {
361: ($name,$value) = split(/=/,$pair);
362: $value =~ tr/+/ /;
363: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
364: $FORM{$name}=$value;
365: }
366:
367: if ((!$FORM{'uname'}) || (!$FORM{'upass0'}) || (!$FORM{'udom'})) {
368: failed($r,'Username, password and domain need to be specified.');
369: return OK;
370: }
371:
372: # split user logging in and "su"-user
373:
374: ($FORM{'uname'},$FORM{'suname'})=split(/\:/,$FORM{'uname'});
375: $FORM{'uname'} =~ s/\W//g;
376: $FORM{'suname'} =~ s/\W//g;
377: $FORM{'udom'} =~ s/\W//g;
378:
379: my $role = $r->dir_config('lonRole');
380: my $domain = $r->dir_config('lonDefDomain');
381: my $prodir = $r->dir_config('lonUsersDir');
382:
383: # ---------------------------------------- Get the information from login token
384:
385: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$FORM{'logtoken'},
386: $FORM{'serverid'});
387:
388: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
389: failed($r,'Information needed to verify your login information is missing, inaccessible or expired.');
390: return OK;
391: } else {
392: unless (&Apache::lonnet::reply('tmpdel:'.$FORM{'logtoken'},
393: $FORM{'serverid'}) eq 'ok') {
394: &failed($r,'Session could not be opened.');
395: }
396: }
397: my ($key,$firsturl)=split(/&/,$tmpinfo);
398:
399: my $keybin=pack("H16",$key);
400:
401: my $cipher;
402: if ($Crypt::DES::VERSION>=2.03) {
403: $cipher=new Crypt::DES $keybin;
404: }
405: else {
406: $cipher=new DES $keybin;
407: }
408: my $upass='';
409: for (my $i=0;$i<=2;$i++) {
410: my $chunk=
411: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},0,16))));
412:
413: $chunk.=
414: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},16,16))));
415:
416: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
417: $upass.=$chunk;
418: }
419:
420: # ---------------------------------------------------------------- Authenticate
421: my $authhost=Apache::lonnet::authenticate($FORM{'uname'},
422: $upass,
423: $FORM{'udom'});
424:
425: # --------------------------------------------------------------------- Failed?
426:
427: if ($authhost eq 'no_host') {
428: failed($r,'Username and/or password could not be authenticated.');
429: return OK;
430: }
431:
432: if (($firsturl eq '') ||
433: ($firsturl=~/^\/adm\/(logout|remote)/)) {
434: $firsturl='/adm/roles';
435: }
436: # --------------------------------- Are we attempting to login as somebody else?
437: if ($FORM{'suname'}) {
438: # ------------ see if the original user has enough privileges to pull this stunt
439: if (&Apache::lonnet::privileged($FORM{'uname'},$FORM{'udom'})) {
440: # ---------------------------------------------------- see if the su-user exists
441: unless (&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'})
442: eq 'no_host') {
443: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'}));
444: # ------------------------------ see if the su-user is not too highly privileged
445: unless (&Apache::lonnet::privileged($FORM{'suname'},$FORM{'udom'})) {
446: # -------------------------------------------------------- actually switch users
447: &Apache::lonnet::logperm('User '.$FORM{'uname'}.' at '.$FORM{'udom'}.
448: ' logging in as '.$FORM{'suname'});
449: $FORM{'uname'}=$FORM{'suname'};
450: } else {
451: &Apache::lonnet::logthis('Attempted switch user to privileged user');
452: }
453: }
454: } else {
455: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
456: }
457: }
458: &success($r,$FORM{'uname'},$FORM{'udom'},$authhost,$firsturl);
459: return OK;
460: }
461:
462: 1;
463: __END__
464:
465:
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