1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.80 2006/06/27 14:09:46 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 LONCAPA;
33: use Apache::Constants qw(:common);
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, $extra_env) = @_;
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,$username);
107: }
108: }
109: }
110: # ------------------------------------------------------------- Get environment
111:
112: my %userenv=Apache::lonnet::dump('environment',$domain,$username);
113: my ($tmp) = keys(%userenv);
114: if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
115: # default remote control to off
116: if ($userenv{'remote'} ne 'on') { $userenv{'remote'} = 'off'; }
117: } else {
118: undef(%userenv);
119: }
120: if (($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 %initial_env =
136: ("user.name" => $username,
137: "user.domain" => $domain,
138: "user.home" => $authhost,
139: "browser.type" => $clientbrowser,
140: "browser.version" => $clientversion,
141: "browser.mathml" => $clientmathml,
142: "browser.unicode" => $clientunicode,
143: "browser.os" => $clientos,
144: "server.domain" => $r->dir_config('lonDefDomain'),
145: "request.course.fn" => '',
146: "request.course.uri" => '',
147: "request.course.sec" => '',
148: "request.role" => 'cm',
149: "request.role.adv" => $env{'user.adv'},
150: "request.host" => $ENV{'REMOTE_ADDR'},);
151:
152: if ($FORM{'localpath'}) {
153: $initial_env{"browser.localpath"} = $FORM{'localpath'};
154: $initial_env{"browser.localres"} = $FORM{'localres'};
155: }
156:
157: if ($public) {
158: $initial_env{"environment.remote"} = "off";
159: }
160: if ($FORM{'interface'}) {
161: $FORM{'interface'}=~s/\W//gs;
162: $initial_env{"browser.interface"} = $FORM{'interface'};
163: $env{'browser.interface'}=$FORM{'interface'};
164: foreach my $option ('imagesuppress','appletsuppress',
165: 'embedsuppress','fontenhance','blackwhite') {
166: if (($FORM{$option} eq 'true') ||
167: ($userenv{$option} eq 'on')) {
168: $initial_env{"browser.$option"} = "on";
169: }
170: }
171: }
172:
173: open(my $idf,">$lonids/$cookie.id");
174: unless (flock($idf,LOCK_EX)) {
175: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
176: 'Could not obtain exclusive lock in lonauth: '.$!);
177: close($idf);
178: return 'error: '.$!;
179: }
180:
181: while (my ($key,$value) = each(%initial_env)) {
182: print $idf (&escape($key).'='.&escape($value)."\n");
183: }
184: while (my ($key,$value) = each(%userenv)) {
185: print $idf (&escape('environment.'.$key).'='.&escape($value)."\n");
186: }
187: while (my ($key,$value) = each(%{$userroles})) {
188: print $idf (&escape($key).'='.&escape($value)."\n");
189: }
190: while (my ($key,$value) = each(%{$extra_env})) {
191: print $idf (&escape($key).'='.&escape($value)."\n");
192: }
193: close($idf);
194: }
195: $env{'request.role'}='cm';
196: $env{'request.role.adv'}=$env{'user.adv'};
197: $env{'browser.type'}=$clientbrowser;
198: # -------------------------------------------------------------------- Log this
199:
200: &Apache::lonnet::log($domain,$username,$authhost,
201: "Login $ENV{'REMOTE_ADDR'}");
202:
203: # ------------------------------------------------- Check for critical messages
204:
205: my @what=&Apache::lonnet::dump('critical',$domain,$username);
206: if ($what[0]) {
207: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
208: $lowerurl='/adm/email?critical=display';
209: }
210: }
211:
212: # ------------------------------------------------------------ Get cookie ready
213:
214: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
215:
216: $cookie="lonID=$cookie; path=/";
217: # -------------------------------------------------------- Menu script and info
218: my $windowinfo=&Apache::lonmenu::open($clientos);
219: my $startupremote=&Apache::lonmenu::startupremote($lowerurl);
220: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
221: my $setflags=&Apache::lonmenu::setflags();
222: my $maincall=&Apache::lonmenu::maincall();
223: my $start_page=&Apache::loncommon::start_page('Successful Login',
224: $startupremote,
225: {'no_inline_link' => 1,});
226: my $end_page =&Apache::loncommon::end_page();
227:
228: my $continuelink;
229: if (($env{'browser.interface'} eq 'textual') ||
230: ($env{'environment.remote'} eq 'off')) {
231: $continuelink="<a href=\"$lowerurl\">".&mt('Continue')."</a>";
232: }
233: # ------------------------------------------------- Output for successful login
234:
235: &Apache::loncommon::content_type($r,'text/html');
236: $r->header_out('Set-cookie' => $cookie);
237: $r->send_http_header;
238:
239: my %lt=&Apache::lonlocal::texthash(
240: 'wel' => 'Welcome',
241: 'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up',
242: 'pro' => 'Problems',
243: 'log' => 'loginproblems.html',
244: );
245: $r->print(<<ENDSUCCESS);
246: $start_page
247: $setflags
248: $windowinfo
249: <h1>$lt{'wel'}</h1>
250: $lt{'mes'}.<p>
251: <a href="/adm/$lt{'log'}">$lt{'pro'}?</a></p>
252: $remoteinfo
253: $maincall
254: $continuelink
255: $end_page
256: ENDSUCCESS
257: }
258:
259: # --------------------------------------------------------------- Failed login!
260:
261: sub failed {
262: my ($r,$message) = @_;
263: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,
264: {'no_inline_link' => 1,});
265: my $end_page = &Apache::loncommon::end_page();
266:
267: my %lt=('sorry' => &mt('Sorry ...'),
268: 'please' =>
269: &mt('Please [_1]log in again[_2].',
270: "<a href=\"/adm/login?username=$FORM{'uname'}&domain=$FORM{'udom'}\">",
271: '</a>'),
272: 'problemspage' => &mt('loginproblems.html'),
273: 'problems' => 'Problems',
274: );
275: &Apache::loncommon::content_type($r,'text/html');
276: $r->send_http_header;
277:
278: $r->print(<<ENDFAILED);
279: $start_page
280: <h1>$lt{'sorry'}</h1>
281: <p><b>$message</b></p>
282: <p>$lt{'please'}</p>
283: <p>
284: <a href="/adm/$lt{'problemspage'}">$lt{'problems'}</a></p>
285: $end_page
286: ENDFAILED
287: }
288:
289: # ------------------------------------------------------------------ Rerouting!
290:
291: sub reroute {
292: my ($r) = @_;
293: &Apache::loncommon::content_type($r,'text/html');
294: $r->send_http_header;
295: my $msg='<h1>Sorry ...</h1>
296: Please <a href="/">log in again</a>.';
297: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
298: }
299:
300: # ---------------------------------------------------------------- Main handler
301:
302: sub handler {
303: my $r = shift;
304:
305: # Are we re-routing?
306: if (-e '/home/httpd/html/lon-status/reroute.txt') {
307: &reroute($r);
308: return OK;
309: }
310:
311: &Apache::lonlocal::get_language_handle($r);
312:
313: # -------------------------------- Prevent users from attempting to login twice
314: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
315: my $lonid=$cookies{'lonID'};
316: my $cookie;
317: if ($lonid) {
318: my $handle=$lonid->value;
319: $handle=~s/\W//g;
320: my $lonidsdir=$r->dir_config('lonIDsDir');
321: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
322: # Indeed, a valid token is found
323: &Apache::loncommon::content_type($r,'text/html');
324: $r->send_http_header;
325: my $start_page =
326: &Apache::loncommon::start_page('Already logged in');
327: my $end_page =
328: &Apache::loncommon::end_page();
329: $r->print(<<ENDFAILED);
330: $start_page
331: <h1>You are already logged in</h1>
332: <p>Please either <a href="/adm/roles">continue the current session</a> or
333: <a href="/adm/logout">logout</a>.</p>
334: <p>
335: <a href="/adm/loginproblems.html">Problems?</a></p>
336: $end_page
337: ENDFAILED
338: return OK;
339: }
340: }
341:
342: # ---------------------------------------------------- No valid token, continue
343:
344:
345: my $buffer;
346: $r->read($buffer,$r->header_in('Content-length'),0);
347: my @pairs=split(/&/,$buffer);
348: my $pair; my $name; my $value;
349: undef %FORM;
350: %FORM=();
351: foreach $pair (@pairs) {
352: ($name,$value) = split(/=/,$pair);
353: $value =~ tr/+/ /;
354: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
355: $FORM{$name}=$value;
356: }
357:
358: if ((!$FORM{'uname'}) || (!$FORM{'upass0'}) || (!$FORM{'udom'})) {
359: failed($r,'Username, password and domain need to be specified.');
360: return OK;
361: }
362:
363: # split user logging in and "su"-user
364:
365: ($FORM{'uname'},$FORM{'suname'})=split(/\:/,$FORM{'uname'});
366: $FORM{'uname'} =~ s/\W//g;
367: $FORM{'suname'} =~ s/\W//g;
368: $FORM{'udom'} =~ s/\W//g;
369:
370: my $role = $r->dir_config('lonRole');
371: my $domain = $r->dir_config('lonDefDomain');
372: my $prodir = $r->dir_config('lonUsersDir');
373:
374: # ---------------------------------------- Get the information from login token
375:
376: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$FORM{'logtoken'},
377: $FORM{'serverid'});
378:
379: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
380: failed($r,'Information needed to verify your login information is missing, inaccessible or expired.');
381: return OK;
382: } else {
383: my $reply = &Apache::lonnet::reply('tmpdel:'.$FORM{'logtoken'},
384: $FORM{'serverid'});
385: if ( $reply ne 'ok' ) {
386: &failed($r,'Session could not be opened.');
387: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $FORM{'serverid'}." to get login token");
388: return OK;
389: }
390: }
391: my ($key,$firsturl)=split(/&/,$tmpinfo);
392:
393: my $keybin=pack("H16",$key);
394:
395: my $cipher;
396: if ($Crypt::DES::VERSION>=2.03) {
397: $cipher=new Crypt::DES $keybin;
398: }
399: else {
400: $cipher=new DES $keybin;
401: }
402: my $upass='';
403: for (my $i=0;$i<=2;$i++) {
404: my $chunk=
405: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},0,16))));
406:
407: $chunk.=
408: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},16,16))));
409:
410: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
411: $upass.=$chunk;
412: }
413:
414: # ---------------------------------------------------------------- Authenticate
415: my $authhost=Apache::lonnet::authenticate($FORM{'uname'},
416: $upass,
417: $FORM{'udom'});
418:
419: # --------------------------------------------------------------------- Failed?
420:
421: if ($authhost eq 'no_host') {
422: failed($r,'Username and/or password could not be authenticated.');
423: return OK;
424: }
425:
426: if (($firsturl eq '') ||
427: ($firsturl=~/^\/adm\/(logout|remote)/)) {
428: $firsturl='/adm/roles';
429: }
430: # --------------------------------- Are we attempting to login as somebody else?
431: if ($FORM{'suname'}) {
432: # ------------ see if the original user has enough privileges to pull this stunt
433: if (&Apache::lonnet::privileged($FORM{'uname'},$FORM{'udom'})) {
434: # ---------------------------------------------------- see if the su-user exists
435: unless (&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'})
436: eq 'no_host') {
437: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'}));
438: # ------------------------------ see if the su-user is not too highly privileged
439: unless (&Apache::lonnet::privileged($FORM{'suname'},$FORM{'udom'})) {
440: # -------------------------------------------------------- actually switch users
441: &Apache::lonnet::logperm('User '.$FORM{'uname'}.' at '.$FORM{'udom'}.
442: ' logging in as '.$FORM{'suname'});
443: $FORM{'uname'}=$FORM{'suname'};
444: } else {
445: &Apache::lonnet::logthis('Attempted switch user to privileged user');
446: }
447: }
448: } else {
449: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
450: }
451: }
452: &success($r,$FORM{'uname'},$FORM{'udom'},$authhost,$firsturl);
453: return OK;
454: }
455:
456: 1;
457: __END__
458:
459:
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