1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.75 2006/04/20 04:30:02 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 ($tmp !~ /^(con_lost|error|no_such_host)/i) {
116: # default remote control to off
117: if ($userenv{'remote'} ne 'on') { $userenv{'remote'} = 'off'; }
118: foreach my $key (keys(%userenv)) {
119: $userenv.="environment.$key=$userenv{$key}\n";
120: }
121: }
122: if (($userenv{'interface'}) && (!$FORM{'interface'})) {
123: $FORM{'interface'}=$userenv{'interface'};
124: }
125: $env{'environment.remote'}=$userenv{'remote'};
126: if ($userenv{'texengine'} eq 'ttm') { $clientmathml=1; }
127:
128: # --------------- Do not trust query string to be put directly into environment
129: foreach ('imagesuppress','appletsuppress',
130: 'embedsuppress','fontenhance','blackwhite',
131: 'interface','localpath','localres') {
132: $FORM{$_}=~s/[\n\r\=]//gs;
133: }
134: # --------------------------------------------------------- Write first profile
135:
136: {
137: my $idf=Apache::File->new(">$lonids/$cookie.id");
138: unless (flock($idf,LOCK_EX)) {
139: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
140: 'Could not obtain exclusive lock in lonauth: '.$!);
141: $idf->close();
142: return 'error: '.$!;
143: }
144: if ($userenv ne '') { print $idf "$userenv\n"; }
145: print $idf "user.name=$username\n";
146: print $idf "user.domain=$domain\n";
147: print $idf "user.home=$authhost\n";
148: print $idf "browser.type=$clientbrowser\n";
149: print $idf "browser.version=$clientversion\n";
150: print $idf "browser.mathml=$clientmathml\n";
151: print $idf "browser.unicode=$clientunicode\n";
152: print $idf "browser.os=$clientos\n";
153: if ($FORM{'localpath'}) {
154: print $idf "browser.localpath=$FORM{'localpath'}\n";
155: print $idf "browser.localres=$FORM{'localres'}\n";
156: }
157: print $idf "server.domain=".$r->dir_config('lonDefDomain')."\n";
158: print $idf "request.course.fn=\n";
159: print $idf "request.course.uri=\n";
160: print $idf "request.course.sec=\n";
161: print $idf "request.role=cm\n";
162: print $idf "request.role.adv=$env{'user.adv'}\n";
163: print $idf "request.host=$ENV{'REMOTE_ADDR'}\n";
164: if ($public) {
165: print $idf "environment.remote=off\n";
166: }
167: if ($FORM{'interface'}) {
168: $FORM{'interface'}=~s/\W//gs;
169: print $idf "browser.interface=$FORM{'interface'}\n";
170: $env{'browser.interface'}=$FORM{'interface'};
171: foreach ('imagesuppress','appletsuppress',
172: 'embedsuppress','fontenhance','blackwhite') {
173: if (($FORM{$_} eq 'true') ||
174: ($userenv{$_} eq 'on')) {
175: print $idf "browser.$_=on\n";
176: }
177: }
178: }
179: if ($userroles ne '') { print $idf "$userroles"; }
180: $idf->close();
181: }
182: $env{'request.role'}='cm';
183: $env{'request.role.adv'}=$env{'user.adv'};
184: $env{'browser.type'}=$clientbrowser;
185: # -------------------------------------------------------------------- Log this
186:
187: &Apache::lonnet::log($domain,$username,$authhost,
188: "Login $ENV{'REMOTE_ADDR'}");
189:
190: # ------------------------------------------------- Check for critical messages
191:
192: my @what=&Apache::lonnet::dump('critical',$domain,$username);
193: if ($what[0]) {
194: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
195: $lowerurl='/adm/email?critical=display';
196: }
197: }
198:
199: # ------------------------------------------------------------ Get cookie ready
200:
201: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
202:
203: $cookie="lonID=$cookie; path=/";
204: # -------------------------------------------------------- Menu script and info
205: my $windowinfo=&Apache::lonmenu::open($clientos);
206: my $startupremote=&Apache::lonmenu::startupremote($lowerurl);
207: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
208: my $setflags=&Apache::lonmenu::setflags();
209: my $maincall=&Apache::lonmenu::maincall();
210: my $start_page=&Apache::loncommon::start_page('Successful Login',
211: $startupremote);
212: my $end_page =&Apache::loncommon::end_page();
213:
214: my $continuelink;
215: if (($env{'browser.interface'} eq 'textual') ||
216: ($env{'environment.remote'} eq 'off')) {
217: $continuelink="<a href=\"$lowerurl\">".&mt('Continue')."</a>";
218: }
219: # ------------------------------------------------- Output for successful login
220:
221: &Apache::loncommon::content_type($r,'text/html');
222: $r->header_out('Set-cookie' => $cookie);
223: $r->send_http_header;
224:
225: my %lt=&Apache::lonlocal::texthash(
226: 'wel' => 'Welcome',
227: 'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up',
228: 'pro' => 'Problems',
229: 'log' => 'loginproblems.html',
230: );
231: $r->print(<<ENDSUCCESS);
232: $start_page
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: $end_page
242: ENDSUCCESS
243: }
244:
245: # --------------------------------------------------------------- Failed login!
246:
247: sub failed {
248: my ($r,$message) = @_;
249: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login');
250: my $end_page = &Apache::loncommon::end_page();
251:
252: my %lt=('sorry' => &mt('Sorry ...'),
253: 'please' =>
254: &mt('Please [_1]log in again[_2].',
255: "<a href=\"/adm/login?username=$FORM{'uname'}&domain=$FORM{'udom'}\">",
256: '</a>'),
257: 'problemspage' => &mt('loginproblems.html'),
258: 'problems' => 'Problems',
259: );
260: &Apache::loncommon::content_type($r,'text/html');
261: $r->send_http_header;
262:
263: $r->print(<<ENDFAILED);
264: $start_page
265: <h1>$lt{'sorry'}</h1>
266: <p><b>$message</b></p>
267: <p>$lt{'please'}</p>
268: <p>
269: <a href="/adm/$lt{'problemspage'}">$lt{'problems'}</a></p>
270: $end_page
271: ENDFAILED
272: }
273:
274: # ------------------------------------------------------------------ Rerouting!
275:
276: sub reroute {
277: my ($r) = @_;
278: &Apache::loncommon::content_type($r,'text/html');
279: $r->send_http_header;
280: my $msg='<h1>Sorry ...</h1>
281: Please <a href="/">log in again</a>.';
282: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
283: }
284:
285: # ---------------------------------------------------------------- Main handler
286:
287: sub handler {
288: my $r = shift;
289:
290: # Are we re-routing?
291: if (-e '/home/httpd/html/lon-status/reroute.txt') {
292: &reroute($r);
293: return OK;
294: }
295:
296: &Apache::lonlocal::get_language_handle($r);
297:
298: # -------------------------------- Prevent users from attempting to login twice
299: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
300: my $lonid=$cookies{'lonID'};
301: my $cookie;
302: if ($lonid) {
303: my $handle=$lonid->value;
304: $handle=~s/\W//g;
305: my $lonidsdir=$r->dir_config('lonIDsDir');
306: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
307: # Indeed, a valid token is found
308: &Apache::loncommon::content_type($r,'text/html');
309: $r->send_http_header;
310: my $start_page =
311: &Apache::loncommon::start_page('Already logged in');
312: my $end_page =
313: &Apache::loncommon::end_page();
314: $r->print(<<ENDFAILED);
315: $start_page
316: <h1>You are already logged in</h1>
317: <p>Please either <a href="/adm/roles">continue the current session</a> or
318: <a href="/adm/logout">logout</a>.</p>
319: <p>
320: <a href="/adm/loginproblems.html">Problems?</a></p>
321: $end_page
322: ENDFAILED
323: return OK;
324: }
325: }
326:
327: # ---------------------------------------------------- No valid token, continue
328:
329:
330: my $buffer;
331: $r->read($buffer,$r->header_in('Content-length'),0);
332: my @pairs=split(/&/,$buffer);
333: my $pair; my $name; my $value;
334: undef %FORM;
335: %FORM=();
336: foreach $pair (@pairs) {
337: ($name,$value) = split(/=/,$pair);
338: $value =~ tr/+/ /;
339: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
340: $FORM{$name}=$value;
341: }
342:
343: if ((!$FORM{'uname'}) || (!$FORM{'upass0'}) || (!$FORM{'udom'})) {
344: failed($r,'Username, password and domain need to be specified.');
345: return OK;
346: }
347:
348: # split user logging in and "su"-user
349:
350: ($FORM{'uname'},$FORM{'suname'})=split(/\:/,$FORM{'uname'});
351: $FORM{'uname'} =~ s/\W//g;
352: $FORM{'suname'} =~ s/\W//g;
353: $FORM{'udom'} =~ s/\W//g;
354:
355: my $role = $r->dir_config('lonRole');
356: my $domain = $r->dir_config('lonDefDomain');
357: my $prodir = $r->dir_config('lonUsersDir');
358:
359: # ---------------------------------------- Get the information from login token
360:
361: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$FORM{'logtoken'},
362: $FORM{'serverid'});
363:
364: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
365: failed($r,'Information needed to verify your login information is missing, inaccessible or expired.');
366: return OK;
367: } else {
368: unless (&Apache::lonnet::reply('tmpdel:'.$FORM{'logtoken'},
369: $FORM{'serverid'}) eq 'ok') {
370: &failed($r,'Session could not be opened.');
371: }
372: }
373: my ($key,$firsturl)=split(/&/,$tmpinfo);
374:
375: my $keybin=pack("H16",$key);
376:
377: my $cipher;
378: if ($Crypt::DES::VERSION>=2.03) {
379: $cipher=new Crypt::DES $keybin;
380: }
381: else {
382: $cipher=new DES $keybin;
383: }
384: my $upass='';
385: for (my $i=0;$i<=2;$i++) {
386: my $chunk=
387: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},0,16))));
388:
389: $chunk.=
390: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},16,16))));
391:
392: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
393: $upass.=$chunk;
394: }
395:
396: # ---------------------------------------------------------------- Authenticate
397: my $authhost=Apache::lonnet::authenticate($FORM{'uname'},
398: $upass,
399: $FORM{'udom'});
400:
401: # --------------------------------------------------------------------- Failed?
402:
403: if ($authhost eq 'no_host') {
404: failed($r,'Username and/or password could not be authenticated.');
405: return OK;
406: }
407:
408: if (($firsturl eq '') ||
409: ($firsturl=~/^\/adm\/(logout|remote)/)) {
410: $firsturl='/adm/roles';
411: }
412: # --------------------------------- Are we attempting to login as somebody else?
413: if ($FORM{'suname'}) {
414: # ------------ see if the original user has enough privileges to pull this stunt
415: if (&Apache::lonnet::privileged($FORM{'uname'},$FORM{'udom'})) {
416: # ---------------------------------------------------- see if the su-user exists
417: unless (&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'})
418: eq 'no_host') {
419: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'}));
420: # ------------------------------ see if the su-user is not too highly privileged
421: unless (&Apache::lonnet::privileged($FORM{'suname'},$FORM{'udom'})) {
422: # -------------------------------------------------------- actually switch users
423: &Apache::lonnet::logperm('User '.$FORM{'uname'}.' at '.$FORM{'udom'}.
424: ' logging in as '.$FORM{'suname'});
425: $FORM{'uname'}=$FORM{'suname'};
426: } else {
427: &Apache::lonnet::logthis('Attempted switch user to privileged user');
428: }
429: }
430: } else {
431: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
432: }
433: }
434: &success($r,$FORM{'uname'},$FORM{'udom'},$authhost,$firsturl);
435: return OK;
436: }
437:
438: 1;
439: __END__
440:
441:
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