1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.79 2006/06/02 21:23:49 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) = @_;
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($value)."\n");
189: }
190: close($idf);
191: }
192: $env{'request.role'}='cm';
193: $env{'request.role.adv'}=$env{'user.adv'};
194: $env{'browser.type'}=$clientbrowser;
195: # -------------------------------------------------------------------- Log this
196:
197: &Apache::lonnet::log($domain,$username,$authhost,
198: "Login $ENV{'REMOTE_ADDR'}");
199:
200: # ------------------------------------------------- Check for critical messages
201:
202: my @what=&Apache::lonnet::dump('critical',$domain,$username);
203: if ($what[0]) {
204: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
205: $lowerurl='/adm/email?critical=display';
206: }
207: }
208:
209: # ------------------------------------------------------------ Get cookie ready
210:
211: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
212:
213: $cookie="lonID=$cookie; path=/";
214: # -------------------------------------------------------- Menu script and info
215: my $windowinfo=&Apache::lonmenu::open($clientos);
216: my $startupremote=&Apache::lonmenu::startupremote($lowerurl);
217: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
218: my $setflags=&Apache::lonmenu::setflags();
219: my $maincall=&Apache::lonmenu::maincall();
220: my $start_page=&Apache::loncommon::start_page('Successful Login',
221: $startupremote,
222: {'no_inline_link' => 1,});
223: my $end_page =&Apache::loncommon::end_page();
224:
225: my $continuelink;
226: if (($env{'browser.interface'} eq 'textual') ||
227: ($env{'environment.remote'} eq 'off')) {
228: $continuelink="<a href=\"$lowerurl\">".&mt('Continue')."</a>";
229: }
230: # ------------------------------------------------- Output for successful login
231:
232: &Apache::loncommon::content_type($r,'text/html');
233: $r->header_out('Set-cookie' => $cookie);
234: $r->send_http_header;
235:
236: my %lt=&Apache::lonlocal::texthash(
237: 'wel' => 'Welcome',
238: 'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up',
239: 'pro' => 'Problems',
240: 'log' => 'loginproblems.html',
241: );
242: $r->print(<<ENDSUCCESS);
243: $start_page
244: $setflags
245: $windowinfo
246: <h1>$lt{'wel'}</h1>
247: $lt{'mes'}.<p>
248: <a href="/adm/$lt{'log'}">$lt{'pro'}?</a></p>
249: $remoteinfo
250: $maincall
251: $continuelink
252: $end_page
253: ENDSUCCESS
254: }
255:
256: # --------------------------------------------------------------- Failed login!
257:
258: sub failed {
259: my ($r,$message) = @_;
260: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,
261: {'no_inline_link' => 1,});
262: my $end_page = &Apache::loncommon::end_page();
263:
264: my %lt=('sorry' => &mt('Sorry ...'),
265: 'please' =>
266: &mt('Please [_1]log in again[_2].',
267: "<a href=\"/adm/login?username=$FORM{'uname'}&domain=$FORM{'udom'}\">",
268: '</a>'),
269: 'problemspage' => &mt('loginproblems.html'),
270: 'problems' => 'Problems',
271: );
272: &Apache::loncommon::content_type($r,'text/html');
273: $r->send_http_header;
274:
275: $r->print(<<ENDFAILED);
276: $start_page
277: <h1>$lt{'sorry'}</h1>
278: <p><b>$message</b></p>
279: <p>$lt{'please'}</p>
280: <p>
281: <a href="/adm/$lt{'problemspage'}">$lt{'problems'}</a></p>
282: $end_page
283: ENDFAILED
284: }
285:
286: # ------------------------------------------------------------------ Rerouting!
287:
288: sub reroute {
289: my ($r) = @_;
290: &Apache::loncommon::content_type($r,'text/html');
291: $r->send_http_header;
292: my $msg='<h1>Sorry ...</h1>
293: Please <a href="/">log in again</a>.';
294: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
295: }
296:
297: # ---------------------------------------------------------------- Main handler
298:
299: sub handler {
300: my $r = shift;
301:
302: # Are we re-routing?
303: if (-e '/home/httpd/html/lon-status/reroute.txt') {
304: &reroute($r);
305: return OK;
306: }
307:
308: &Apache::lonlocal::get_language_handle($r);
309:
310: # -------------------------------- Prevent users from attempting to login twice
311: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
312: my $lonid=$cookies{'lonID'};
313: my $cookie;
314: if ($lonid) {
315: my $handle=$lonid->value;
316: $handle=~s/\W//g;
317: my $lonidsdir=$r->dir_config('lonIDsDir');
318: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
319: # Indeed, a valid token is found
320: &Apache::loncommon::content_type($r,'text/html');
321: $r->send_http_header;
322: my $start_page =
323: &Apache::loncommon::start_page('Already logged in');
324: my $end_page =
325: &Apache::loncommon::end_page();
326: $r->print(<<ENDFAILED);
327: $start_page
328: <h1>You are already logged in</h1>
329: <p>Please either <a href="/adm/roles">continue the current session</a> or
330: <a href="/adm/logout">logout</a>.</p>
331: <p>
332: <a href="/adm/loginproblems.html">Problems?</a></p>
333: $end_page
334: ENDFAILED
335: return OK;
336: }
337: }
338:
339: # ---------------------------------------------------- No valid token, continue
340:
341:
342: my $buffer;
343: $r->read($buffer,$r->header_in('Content-length'),0);
344: my @pairs=split(/&/,$buffer);
345: my $pair; my $name; my $value;
346: undef %FORM;
347: %FORM=();
348: foreach $pair (@pairs) {
349: ($name,$value) = split(/=/,$pair);
350: $value =~ tr/+/ /;
351: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
352: $FORM{$name}=$value;
353: }
354:
355: if ((!$FORM{'uname'}) || (!$FORM{'upass0'}) || (!$FORM{'udom'})) {
356: failed($r,'Username, password and domain need to be specified.');
357: return OK;
358: }
359:
360: # split user logging in and "su"-user
361:
362: ($FORM{'uname'},$FORM{'suname'})=split(/\:/,$FORM{'uname'});
363: $FORM{'uname'} =~ s/\W//g;
364: $FORM{'suname'} =~ s/\W//g;
365: $FORM{'udom'} =~ s/\W//g;
366:
367: my $role = $r->dir_config('lonRole');
368: my $domain = $r->dir_config('lonDefDomain');
369: my $prodir = $r->dir_config('lonUsersDir');
370:
371: # ---------------------------------------- Get the information from login token
372:
373: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$FORM{'logtoken'},
374: $FORM{'serverid'});
375:
376: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
377: failed($r,'Information needed to verify your login information is missing, inaccessible or expired.');
378: return OK;
379: } else {
380: my $reply = &Apache::lonnet::reply('tmpdel:'.$FORM{'logtoken'},
381: $FORM{'serverid'});
382: if ( $reply ne 'ok' ) {
383: &failed($r,'Session could not be opened.');
384: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $FORM{'serverid'}." to get login token");
385: return OK;
386: }
387: }
388: my ($key,$firsturl)=split(/&/,$tmpinfo);
389:
390: my $keybin=pack("H16",$key);
391:
392: my $cipher;
393: if ($Crypt::DES::VERSION>=2.03) {
394: $cipher=new Crypt::DES $keybin;
395: }
396: else {
397: $cipher=new DES $keybin;
398: }
399: my $upass='';
400: for (my $i=0;$i<=2;$i++) {
401: my $chunk=
402: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},0,16))));
403:
404: $chunk.=
405: $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},16,16))));
406:
407: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
408: $upass.=$chunk;
409: }
410:
411: # ---------------------------------------------------------------- Authenticate
412: my $authhost=Apache::lonnet::authenticate($FORM{'uname'},
413: $upass,
414: $FORM{'udom'});
415:
416: # --------------------------------------------------------------------- Failed?
417:
418: if ($authhost eq 'no_host') {
419: failed($r,'Username and/or password could not be authenticated.');
420: return OK;
421: }
422:
423: if (($firsturl eq '') ||
424: ($firsturl=~/^\/adm\/(logout|remote)/)) {
425: $firsturl='/adm/roles';
426: }
427: # --------------------------------- Are we attempting to login as somebody else?
428: if ($FORM{'suname'}) {
429: # ------------ see if the original user has enough privileges to pull this stunt
430: if (&Apache::lonnet::privileged($FORM{'uname'},$FORM{'udom'})) {
431: # ---------------------------------------------------- see if the su-user exists
432: unless (&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'})
433: eq 'no_host') {
434: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'}));
435: # ------------------------------ see if the su-user is not too highly privileged
436: unless (&Apache::lonnet::privileged($FORM{'suname'},$FORM{'udom'})) {
437: # -------------------------------------------------------- actually switch users
438: &Apache::lonnet::logperm('User '.$FORM{'uname'}.' at '.$FORM{'udom'}.
439: ' logging in as '.$FORM{'suname'});
440: $FORM{'uname'}=$FORM{'suname'};
441: } else {
442: &Apache::lonnet::logthis('Attempted switch user to privileged user');
443: }
444: }
445: } else {
446: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
447: }
448: }
449: &success($r,$FORM{'uname'},$FORM{'udom'},$authhost,$firsturl);
450: return OK;
451: }
452:
453: 1;
454: __END__
455:
456:
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