File:
[LON-CAPA] /
loncom /
auth /
lonauth.pm
Revision
1.117:
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Tue Aug 9 01:35:31 2011 UTC (13 years, 1 month ago) by
raeburn
Branches:
MAIN
CVS tags:
HEAD
- Bug 6371.
- Use of lonBalancer in Apache config file superceded by setting
loadbalancing in domain configuration.
- More granularity available in load balancing:
- Rules can be defined for users in domain, based on institutional
affiliation (e.g., Faculty, Staff, Student etc.).
- Rules for advanced user or author trump rules based on affiliation
- Rules can also be set for users from other domain hosted by
institution (i.e., multi-domain server set-ups)
- Rules can also be set for users from other institutions.
1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.117 2011/08/09 01:35:31 raeburn 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 DynaLoader; # for Crypt::DES version
36: use Crypt::DES;
37: use Apache::loncommon();
38: use Apache::lonnet;
39: use Apache::lonmenu();
40: use Apache::createaccount;
41: use Fcntl qw(:flock);
42: use Apache::lonlocal;
43: use Apache::File ();
44: use HTML::Entities;
45:
46: # ------------------------------------------------------------ Successful login
47: sub success {
48: my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
49: $form) = @_;
50:
51: # ------------------------------------------------------------ Get cookie ready
52: my $cookie =
53: &Apache::loncommon::init_user_environment($r, $username, $domain,
54: $authhost, $form,
55: {'extra_env' => $extra_env,});
56:
57: my $public=($username eq 'public' && $domain eq 'public');
58:
59: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
60:
61: # -------------------------------------------------------------------- Log this
62:
63: &Apache::lonnet::log($domain,$username,$authhost,
64: "Login $ENV{'REMOTE_ADDR'}");
65:
66: # ------------------------------------------------- Check for critical messages
67:
68: my @what=&Apache::lonnet::dump('critical',$domain,$username);
69: if ($what[0]) {
70: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
71: $lowerurl='/adm/email?critical=display';
72: }
73: }
74:
75: # ------------------------------------------------------------ Get cookie ready
76: $cookie="lonID=$cookie; path=/";
77: # -------------------------------------------------------- Menu script and info
78: my $destination = $lowerurl;
79:
80: if (defined($form->{role})) {
81: my $envkey = 'user.role.'.$form->{role};
82: my $now=time;
83: my $then=$env{'user.login.time'};
84: my $refresh=$env{'user.refresh.time'};
85: my $update=$env{'user.update.time'};
86: if (!$update) {
87: $update = $then;
88: }
89: if (exists($env{$envkey})) {
90: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
91: &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
92: \$trolecode,\$tstatus,\$tstart,\$tend);
93: if ($tstatus eq 'is') {
94: $destination .= ($destination =~ /\?/) ? '&' : '?';
95: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
96: $destination .= 'selectrole=1&'.$newrole.'=1';
97: }
98: }
99: }
100: if (defined($form->{symb})) {
101: my $destsymb = $form->{symb};
102: $destination .= ($destination =~ /\?/) ? '&' : '?';
103: if ($destsymb =~ /___/) {
104: # FIXME Need to deal with encrypted symbs and urls as needed.
105: my ($map,$resid,$desturl)=split(/___/,$destsymb);
106: unless ($desturl=~/^(adm|uploaded|editupload|public)/) {
107: $desturl = &Apache::lonnet::clutter($desturl);
108: }
109: $desturl = &HTML::Entities::encode($desturl,'"<>&');
110: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
111: $destination .= '&destinationurl='.$desturl.
112: '&destsymb='.$destsymb;
113: } else {
114: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
115: $destination .= '&destinationurl='.$destsymb;
116: }
117: }
118: if ($destination =~ m{^/adm/roles}) {
119: $destination .= ($destination =~ /\?/) ? '&' : '?';
120: $destination .= 'source=login';
121: }
122:
123: my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
124: my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
125: my $brcrum = [{'href' => '',
126: 'text' => 'Successful Login'},];
127: my $start_page=&Apache::loncommon::start_page('Successful Login',
128: $header,
129: {'bread_crumbs' => $brcrum,});
130: my $end_page =&Apache::loncommon::end_page();
131:
132: my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
133: # ------------------------------------------------- Output for successful login
134:
135: &Apache::loncommon::content_type($r,'text/html');
136: $r->header_out('Set-cookie' => $cookie);
137: $r->send_http_header;
138:
139: my %lt=&Apache::lonlocal::texthash(
140: 'wel' => 'Welcome',
141: 'pro' => 'Login problems?',
142: 'log' => 'loginproblems.html',
143: );
144: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
145: $r->print(<<ENDSUCCESS);
146: $start_page
147: $windowinfo
148: <h1>$lt{'wel'}</h1>
149: $welcome<p>
150: <a href="/adm/$lt{'log'}">$lt{'pro'}</a></p>
151: $continuelink
152: $end_page
153: ENDSUCCESS
154: }
155:
156: # --------------------------------------------------------------- Failed login!
157:
158: sub failed {
159: my ($r,$message,$form) = @_;
160: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef);
161: my $retry = '/adm/login?username='.$form->{'uname'}.
162: '&domain='.$form->{'udom'};
163: if (exists($form->{role})) {
164: $retry .= '&role='.$form->{role};
165: }
166: if (exists($form->{symb})) {
167: $retry .= '&symb='.$form->{symb};
168: }
169: my $end_page = &Apache::loncommon::end_page();
170: &Apache::loncommon::content_type($r,'text/html');
171: $r->send_http_header;
172: $r->print(
173: $start_page
174: .'<h1>'.&mt('Sorry ...').'</h1>'
175: .'<p class="LC_warning">'.&mt($message).'</p>'
176: .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>')
177: .'</p>'
178: .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'
179: .$end_page
180: );
181: }
182:
183: # ------------------------------------------------------------------ Rerouting!
184:
185: sub reroute {
186: my ($r) = @_;
187: &Apache::loncommon::content_type($r,'text/html');
188: $r->send_http_header;
189: my $msg='<h1>'.&mt('Sorry ...').'</h1>'
190: .&mt('Please [_1]log in again[_2].');
191: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
192: }
193:
194: # ---------------------------------------------------------------- Main handler
195:
196: sub handler {
197: my $r = shift;
198: my $form;
199: # Are we re-routing?
200: if (-e '/home/httpd/html/lon-status/reroute.txt') {
201: &reroute($r);
202: return OK;
203: }
204:
205: &Apache::lonlocal::get_language_handle($r);
206:
207: # -------------------------------- Prevent users from attempting to login twice
208: my $handle = &Apache::lonnet::check_for_valid_session($r);
209: if ($handle ne '') {
210: my $lonidsdir=$r->dir_config('lonIDsDir');
211: if ($handle=~/^publicuser\_/) {
212: # For "public user" - remove it, we apparently really want to login
213: unlink($r->dir_config('lonIDsDir')."/$handle.id");
214: } else {
215: # Indeed, a valid token is found
216: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
217: &Apache::loncommon::content_type($r,'text/html');
218: $r->send_http_header;
219: my $start_page =
220: &Apache::loncommon::start_page('Already logged in');
221: my $end_page =
222: &Apache::loncommon::end_page();
223: my $dest = '/adm/roles';
224: if ($env{'form.firsturl'} ne '') {
225: $dest = $env{'form.firsturl'};
226: }
227: $r->print(
228: $start_page
229: .'<h1>'.&mt('You are already logged in!').'</h1>'
230: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
231: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
232: .'</p>'
233: .$end_page
234: );
235: return OK;
236: }
237: }
238:
239: # ---------------------------------------------------- No valid token, continue
240:
241:
242: my $buffer;
243: if ($r->header_in('Content-length') > 0) {
244: $r->read($buffer,$r->header_in('Content-length'),0);
245: }
246: my %form;
247: foreach my $pair (split(/&/,$buffer)) {
248: my ($name,$value) = split(/=/,$pair);
249: $value =~ tr/+/ /;
250: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
251: $form{$name}=$value;
252: }
253:
254: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
255: &failed($r,'Username, password and domain need to be specified.',
256: \%form);
257: return OK;
258: }
259:
260: # split user logging in and "su"-user
261:
262: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
263: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
264: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
265: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
266:
267: my $role = $r->dir_config('lonRole');
268: my $domain = $r->dir_config('lonDefDomain');
269: my $prodir = $r->dir_config('lonUsersDir');
270: my $contact_name = &mt('LON-CAPA helpdesk');
271:
272: # ---------------------------------------- Get the information from login token
273:
274: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
275: $form{'serverid'});
276:
277: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
278: ($tmpinfo eq 'no_such_host')) {
279: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
280: return OK;
281: } else {
282: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
283: $form{'serverid'});
284: if ( $reply ne 'ok' ) {
285: &failed($r,'Session could not be opened.',\%form);
286: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
287: return OK;
288: }
289: }
290:
291: if (!&Apache::lonnet::domain($form{'udom'})) {
292: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
293: return OK;
294: }
295:
296: my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
297: if ($rolestr) {
298: $rolestr = &unescape($rolestr);
299: }
300: if ($symbstr) {
301: $symbstr= &unescape($symbstr);
302: }
303: if ($rolestr =~ /^role=/) {
304: (undef,$form{'role'}) = split('=',$rolestr);
305: }
306: if ($symbstr =~ /^symb=/) {
307: (undef,$form{'symb'}) = split('=',$symbstr);
308: }
309:
310: my $keybin=pack("H16",$key);
311:
312: my $cipher;
313: if ($Crypt::DES::VERSION>=2.03) {
314: $cipher=new Crypt::DES $keybin;
315: }
316: else {
317: $cipher=new DES $keybin;
318: }
319: my $upass='';
320: for (my $i=0;$i<=2;$i++) {
321: my $chunk=
322: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
323:
324: $chunk.=
325: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
326:
327: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
328: $upass.=$chunk;
329: }
330:
331: # ---------------------------------------------------------------- Authenticate
332: my @cancreate;
333: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
334: if (ref($domconfig{'usercreation'}) eq 'HASH') {
335: if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') {
336: if (ref($domconfig{'usercreation'}{'cancreate'}{'selfcreate'}) eq 'ARRAY') {
337: @cancreate = @{$domconfig{'usercreation'}{'cancreate'}{'selfcreate'}};
338: } elsif (($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') &&
339: ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne '')) {
340: @cancreate = ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'});
341: }
342: }
343: }
344: my $defaultauth;
345: if (grep(/^login$/,@cancreate)) {
346: $defaultauth = 1;
347: }
348: my $clientcancheckhost = 1;
349: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
350: $form{'udom'},$defaultauth,
351: $clientcancheckhost);
352:
353: # --------------------------------------------------------------------- Failed?
354:
355: if ($authhost eq 'no_host') {
356: &failed($r,'Username and/or password could not be authenticated.',
357: \%form);
358: return OK;
359: } elsif ($authhost eq 'no_account_on_host') {
360: my %domconfig =
361: &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
362: if (grep(/^login$/,@cancreate)) {
363: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
364: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
365: return OK;
366: }
367: my $start_page =
368: &Apache::loncommon::start_page('Create a user account in LON-CAPA');
369: my $lonhost = $r->dir_config('lonHostID');
370: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
371: my $contacts =
372: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
373: $form{'udom'},$origmail);
374: my ($contact_email) = split(',',$contacts);
375: my $output = &Apache::createaccount::username_check($form{'uname'},
376: $form{'udom'},$domdesc,'',
377: $lonhost,$contact_email,$contact_name);
378: &Apache::loncommon::content_type($r,'text/html');
379: $r->send_http_header;
380: &Apache::createaccount::print_header($r,$start_page);
381: $r->print('<h3>'.&mt('Account creation').'</h3>'.
382: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
383: $output.&Apache::loncommon::end_page());
384: return OK;
385: } else {
386: &failed($r,'Although your username and password were authenticated, you do not currently have a LON-CAPA account in this domain, and you are not permitted to create one.',\%form);
387: return OK;
388: }
389: }
390:
391: if (($firsturl eq '') ||
392: ($firsturl=~/^\/adm\/(logout|remote)/)) {
393: $firsturl='/adm/roles';
394: }
395: # --------------------------------- Are we attempting to login as somebody else?
396: if ($form{'suname'}) {
397: # ------------ see if the original user has enough privileges to pull this stunt
398: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
399: # ---------------------------------------------------- see if the su-user exists
400: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
401: eq 'no_host') {
402: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
403: # ------------------------------ see if the su-user is not too highly privileged
404: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
405: # -------------------------------------------------------- actually switch users
406: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
407: ' logging in as '.$form{'suname'});
408: $form{'uname'}=$form{'suname'};
409: } else {
410: &Apache::lonnet::logthis('Attempted switch user to privileged user');
411: }
412: }
413: } else {
414: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
415: }
416: }
417:
418: my ($is_balancer,$otherserver) =
419: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
420:
421: if ($is_balancer) {
422: if (!$otherserver) {
423: ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
424: }
425: if ($otherserver) {
426: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
427: \%form);
428: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
429: } else {
430: $r->print(&noswitch());
431: }
432: return OK;
433: } else {
434: if (!&check_can_host($r,\%form,$authhost)) {
435: my $otherserver = &Apache::lonnet::choose_server($form{'udom'});
436: if ($otherserver) {
437: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
438: \%form);
439: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
440: } else {
441: $r->print(&noswitch());
442: }
443: return OK;
444: }
445:
446: # ------------------------------------------------------- Do the load balancing
447:
448: # ---------------------------------------------------------- Determine own load
449: my $loadlim = $r->dir_config('lonLoadLim');
450: my $loadavg;
451: {
452: my $loadfile=Apache::File->new('/proc/loadavg');
453: $loadavg=<$loadfile>;
454: }
455: $loadavg =~ s/\s.*//g;
456: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
457: my $userloadpercent=&Apache::lonnet::userload();
458:
459: # ---------------------------------------------------------- Are we overloaded?
460: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
461: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
462: if (!$unloaded) {
463: $unloaded = &Apache::lonnet::choose_server($form{'udom'});
464: }
465: if ($unloaded) {
466: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
467: undef,\%form);
468: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
469: return OK;
470: }
471: }
472: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
473: \%form);
474: return OK;
475: }
476: }
477:
478: sub check_can_host {
479: my ($r,$form,$authhost,$domdesc) = @_;
480: return unless (ref($form) eq 'HASH');
481: my $canhost = 1;
482: my $lonhost = $r->dir_config('lonHostID');
483: my $udom = $form->{'udom'};
484: my @intdoms;
485: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
486: if (ref($internet_names) eq 'ARRAY') {
487: @intdoms = @{$internet_names};
488: }
489: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
490: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
491: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
492: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
493: my $hostname = &Apache::lonnet::hostname($lonhost);
494: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
495: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
496: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
497: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
498: my $loncaparev;
499: if ($authhost eq 'no_account_on_host') {
500: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
501: } else {
502: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
503: }
504: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
505: $udomdefaults{'remotesessions'},
506: $defdomdefaults{'hostedsessions'});
507: }
508: unless ($canhost) {
509: if ($authhost eq 'no_account_on_host') {
510: my $checkloginvia = 1;
511: my ($login_host,$hostname) =
512: &Apache::lonnet::choose_server($udom,$checkloginvia);
513: &Apache::loncommon::content_type($r,'text/html');
514: $r->send_http_header;
515: if ($login_host ne '') {
516: my $protocol = $Apache::lonnet::protocol{$login_host};
517: $protocol = 'http' if ($protocol ne 'https');
518: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
519: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
520: '<h3>'.&mt('Account creation').'</h3>'.
521: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
522: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
523: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
524: &Apache::loncommon::end_page());
525: } else {
526: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
527: '<h3>'.&mt('Account creation unavailable').'</h3>'.
528: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
529: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
530: &Apache::loncommon::end_page());
531: }
532: } else {
533: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
534: $form);
535: my ($otherserver) = &Apache::lonnet::choose_server($udom);
536: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
537: }
538: }
539: return $canhost;
540: }
541:
542: sub noswitch {
543: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
544: '<h3>'.&mt('Session unavailable').'</h3>'.
545: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
546: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
547: &Apache::loncommon::end_page();
548: return $result;
549: }
550:
551: 1;
552: __END__
553:
554:
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