1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.121.2.7 2013/12/20 15:03:55 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|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 $windowinfo=&Apache::lonmenu::open($env{'browser.os'});
124: my $startupremote=&Apache::lonmenu::startupremote($destination);
125: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
126: my $setflags=&Apache::lonmenu::setflags();
127: my $maincall=&Apache::lonmenu::maincall();
128: my $brcrum = [{'href' => '',
129: 'text' => 'Successful Login'},];
130: my $start_page=&Apache::loncommon::start_page('Successful Login',
131: $startupremote,
132: {'no_inline_link' => 1,
133: 'bread_crumbs' => $brcrum,});
134: my $end_page =&Apache::loncommon::end_page();
135:
136: my $continuelink;
137: if ($env{'environment.remote'} eq 'off') {
138: $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
139: }
140: # ------------------------------------------------- Output for successful login
141:
142: &Apache::loncommon::content_type($r,'text/html');
143: $r->header_out('Set-cookie' => $cookie);
144: $r->send_http_header;
145:
146: my %lt=&Apache::lonlocal::texthash(
147: 'wel' => 'Welcome',
148: 'pro' => 'Login problems?',
149: );
150: my $loginhelp = &loginhelpdisplay($domain);
151: if ($loginhelp) {
152: $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
153: }
154:
155: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
156: $r->print(<<ENDSUCCESS);
157: $start_page
158: $setflags
159: $windowinfo
160: <h1>$lt{'wel'}</h1>
161: $welcome
162: $loginhelp
163: $remoteinfo
164: $maincall
165: $continuelink
166: $end_page
167: ENDSUCCESS
168: }
169:
170: # --------------------------------------------------------------- Failed login!
171:
172: sub failed {
173: my ($r,$message,$form) = @_;
174: (undef,undef,undef,my $clientmathml,my $clientunicode) =
175: &Apache::loncommon::decode_user_agent();
176: my $args = {};
177: if ($clientunicode && !$clientmathml) {
178: $args = {'browser.unicode' => 1};
179: }
180:
181: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
182: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
183: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
184: if (&Apache::lonnet::domain($udom,'description') eq '') {
185: undef($udom);
186: }
187: my $retry = '/adm/login';
188: if ($uname eq $form->{'uname'}) {
189: $retry .= '?username='.$uname;
190: }
191: if ($udom) {
192: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
193: }
194: if (exists($form->{role})) {
195: my $role = &Apache::loncommon::cleanup_html($form->{role});
196: if ($role ne '') {
197: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
198: }
199: }
200: if (exists($form->{symb})) {
201: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
202: if ($symb ne '') {
203: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
204: }
205: }
206: my $end_page = &Apache::loncommon::end_page();
207: &Apache::loncommon::content_type($r,'text/html');
208: $r->send_http_header;
209: my $loginhelp = &loginhelpdisplay($udom);
210: if ($loginhelp) {
211: $loginhelp = '<p><a href="'.$loginhelp.'">'.&mt('Login problems?').'</a></p>';
212: }
213:
214: $r->print(
215: $start_page
216: .'<h1>'.&mt('Sorry ...').'</h1>'
217: .'<p class="LC_warning">'.&mt($message).'</p>'
218: .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>')
219: .'</p>'
220: .$loginhelp
221: .$end_page
222: );
223: }
224:
225: # ------------------------------------------------------------------ Rerouting!
226:
227: sub reroute {
228: my ($r) = @_;
229: &Apache::loncommon::content_type($r,'text/html');
230: $r->send_http_header;
231: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
232: .&mt('Please [_1]log in again[_2].');
233: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
234: }
235:
236: # ---------------------------------------------------------------- Main handler
237:
238: sub handler {
239: my $r = shift;
240: my $londocroot = $r->dir_config('lonDocRoot');
241: my $form;
242: # Are we re-routing?
243: if (-e "$londocroot/lon-status/reroute.txt") {
244: &reroute($r);
245: return OK;
246: }
247:
248: &Apache::lonlocal::get_language_handle($r);
249:
250: # -------------------------------- Prevent users from attempting to login twice
251: my $handle = &Apache::lonnet::check_for_valid_session($r);
252: if ($handle ne '') {
253: my $lonidsdir=$r->dir_config('lonIDsDir');
254: if ($handle=~/^publicuser\_/) {
255: # For "public user" - remove it, we apparently really want to login
256: unlink($r->dir_config('lonIDsDir')."/$handle.id");
257: } else {
258: # Indeed, a valid token is found
259: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
260: &Apache::loncommon::content_type($r,'text/html');
261: $r->send_http_header;
262: my $start_page =
263: &Apache::loncommon::start_page('Already logged in');
264: my $end_page =
265: &Apache::loncommon::end_page();
266: my $dest = '/adm/roles';
267: if ($env{'form.firsturl'} ne '') {
268: $dest = $env{'form.firsturl'};
269: }
270: $r->print(
271: $start_page
272: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
273: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
274: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
275: .'</p>'
276: .$end_page
277: );
278: return OK;
279: }
280: }
281:
282: # ---------------------------------------------------- No valid token, continue
283:
284:
285: my $buffer;
286: if ($r->header_in('Content-length') > 0) {
287: $r->read($buffer,$r->header_in('Content-length'),0);
288: }
289: my %form;
290: foreach my $pair (split(/&/,$buffer)) {
291: my ($name,$value) = split(/=/,$pair);
292: $value =~ tr/+/ /;
293: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
294: $form{$name}=$value;
295: }
296:
297: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
298: &failed($r,'Username, password and domain need to be specified.',
299: \%form);
300: return OK;
301: }
302:
303: # split user logging in and "su"-user
304:
305: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
306: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
307: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
308: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
309:
310: my $role = $r->dir_config('lonRole');
311: my $domain = $r->dir_config('lonDefDomain');
312: my $prodir = $r->dir_config('lonUsersDir');
313: my $contact_name = &mt('LON-CAPA helpdesk');
314:
315: # ---------------------------------------- Get the information from login token
316:
317: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
318: $form{'serverid'});
319:
320: my %sessiondata;
321: if ($form{'iptoken'}) {
322: %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
323: my $delete = &Apache::lonnet::tmpdel($form{'token'});
324: }
325:
326: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
327: ($tmpinfo eq 'no_such_host')) {
328: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
329: return OK;
330: } else {
331: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
332: $form{'serverid'});
333: if ( $reply ne 'ok' ) {
334: &failed($r,'Session could not be opened.',\%form);
335: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
336: return OK;
337: }
338: }
339:
340: if (!&Apache::lonnet::domain($form{'udom'})) {
341: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
342: return OK;
343: }
344:
345: my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
346: if ($rolestr) {
347: $rolestr = &unescape($rolestr);
348: }
349: if ($symbstr) {
350: $symbstr= &unescape($symbstr);
351: }
352: if ($rolestr =~ /^role=/) {
353: (undef,$form{'role'}) = split('=',$rolestr);
354: }
355: if ($symbstr =~ /^symb=/) {
356: (undef,$form{'symb'}) = split('=',$symbstr);
357: }
358:
359: my $keybin=pack("H16",$key);
360:
361: my $cipher;
362: if ($Crypt::DES::VERSION>=2.03) {
363: $cipher=new Crypt::DES $keybin;
364: }
365: else {
366: $cipher=new DES $keybin;
367: }
368: my $upass='';
369: for (my $i=0;$i<=2;$i++) {
370: my $chunk=
371: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
372:
373: $chunk.=
374: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
375:
376: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
377: $upass.=$chunk;
378: }
379:
380: # ---------------------------------------------------------------- Authenticate
381:
382: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
383: my ($cancreate,$statustocreate) =
384: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
385: my $defaultauth;
386: if (ref($cancreate) eq 'ARRAY') {
387: if (grep(/^login$/,@{$cancreate})) {
388: $defaultauth = 1;
389: }
390: }
391: my $clientcancheckhost = 1;
392: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
393: $form{'udom'},$defaultauth,
394: $clientcancheckhost);
395:
396: # --------------------------------------------------------------------- Failed?
397:
398: if ($authhost eq 'no_host') {
399: &failed($r,'Username and/or password could not be authenticated.',
400: \%form);
401: return OK;
402: } elsif ($authhost eq 'no_account_on_host') {
403: if ($defaultauth) {
404: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
405: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
406: return OK;
407: }
408: my $start_page =
409: &Apache::loncommon::start_page('Create a user account in LON-CAPA',
410: '',{'no_inline_link' => 1,});
411: my $lonhost = $r->dir_config('lonHostID');
412: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
413: my $contacts =
414: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
415: $form{'udom'},$origmail);
416: my ($contact_email) = split(',',$contacts);
417: my $output =
418: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
419: $domdesc,'',$lonhost,
420: $contact_email,$contact_name,
421: undef,$statustocreate);
422: &Apache::loncommon::content_type($r,'text/html');
423: $r->send_http_header;
424: &Apache::createaccount::print_header($r,$start_page);
425: $r->print('<h3>'.&mt('Account creation').'</h3>'.
426: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
427: $output.&Apache::loncommon::end_page());
428: return OK;
429: } else {
430: &failed($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);
431: return OK;
432: }
433: }
434:
435: if (($firsturl eq '') ||
436: ($firsturl=~/^\/adm\/(logout|remote)/)) {
437: $firsturl='/adm/roles';
438: }
439:
440: my $hosthere;
441: if ($form{'iptoken'}) {
442: if (($sessiondata{'domain'} eq $form{'udom'}) &&
443: ($sessiondata{'username'} eq $form{'uname'})) {
444: $hosthere = 1;
445: }
446: }
447:
448: # --------------------------------- Are we attempting to login as somebody else?
449: if ($form{'suname'}) {
450: # ------------ see if the original user has enough privileges to pull this stunt
451: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
452: # ---------------------------------------------------- see if the su-user exists
453: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
454: eq 'no_host') {
455: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
456: # ------------------------------ see if the su-user is not too highly privileged
457: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
458: # -------------------------------------------------------- actually switch users
459: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
460: ' logging in as '.$form{'suname'});
461: $form{'uname'}=$form{'suname'};
462: } else {
463: &Apache::lonnet::logthis('Attempted switch user to privileged user');
464: }
465: }
466: } else {
467: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
468: }
469: }
470:
471: my ($is_balancer,$otherserver);
472:
473: unless ($hosthere) {
474: ($is_balancer,$otherserver) =
475: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
476: }
477:
478: if ($is_balancer) {
479: if (!$otherserver) {
480: ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
481: }
482: if ($otherserver) {
483: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
484: \%form);
485: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
486: } else {
487: $r->print(&noswitch());
488: }
489: return OK;
490: } else {
491: if (!&check_can_host($r,\%form,$authhost)) {
492: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
493: if ($otherserver) {
494: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
495: \%form);
496: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
497: } else {
498: $r->print(&noswitch());
499: }
500: return OK;
501: }
502:
503: # ------------------------------------------------------- Do the load balancing
504:
505: # ---------------------------------------------------------- Determine own load
506: my $loadlim = $r->dir_config('lonLoadLim');
507: my $loadavg;
508: {
509: my $loadfile=Apache::File->new('/proc/loadavg');
510: $loadavg=<$loadfile>;
511: }
512: $loadavg =~ s/\s.*//g;
513: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
514: my $userloadpercent=&Apache::lonnet::userload();
515:
516: # ---------------------------------------------------------- Are we overloaded?
517: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
518: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
519: if (!$unloaded) {
520: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
521: }
522: if ($unloaded) {
523: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
524: undef,\%form);
525: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
526: return OK;
527: }
528: }
529: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
530: \%form);
531: return OK;
532: }
533: }
534:
535: sub check_can_host {
536: my ($r,$form,$authhost,$domdesc) = @_;
537: return unless (ref($form) eq 'HASH');
538: my $canhost = 1;
539: my $lonhost = $r->dir_config('lonHostID');
540: my $udom = $form->{'udom'};
541: my @intdoms;
542: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
543: if (ref($internet_names) eq 'ARRAY') {
544: @intdoms = @{$internet_names};
545: }
546: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
547: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
548: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
549: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
550: my $hostname = &Apache::lonnet::hostname($lonhost);
551: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
552: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
553: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
554: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
555: my $loncaparev;
556: if ($authhost eq 'no_account_on_host') {
557: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
558: } else {
559: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
560: }
561: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
562: $udomdefaults{'remotesessions'},
563: $defdomdefaults{'hostedsessions'});
564: }
565: unless ($canhost) {
566: if ($authhost eq 'no_account_on_host') {
567: my $checkloginvia = 1;
568: my ($login_host,$hostname) =
569: &Apache::lonnet::choose_server($udom,$checkloginvia);
570: &Apache::loncommon::content_type($r,'text/html');
571: $r->send_http_header;
572: if ($login_host ne '') {
573: my $protocol = $Apache::lonnet::protocol{$login_host};
574: $protocol = 'http' if ($protocol ne 'https');
575: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
576: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
577: '<h3>'.&mt('Account creation').'</h3>'.
578: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
579: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
580: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
581: &Apache::loncommon::end_page());
582: } else {
583: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
584: '<h3>'.&mt('Account creation unavailable').'</h3>'.
585: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
586: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
587: &Apache::loncommon::end_page());
588: }
589: } else {
590: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
591: $form);
592: my ($otherserver) = &Apache::lonnet::choose_server($udom);
593: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
594: }
595: }
596: return $canhost;
597: }
598:
599: sub noswitch {
600: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
601: '<h3>'.&mt('Session unavailable').'</h3>'.
602: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
603: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
604: &Apache::loncommon::end_page();
605: return $result;
606: }
607:
608: sub loginhelpdisplay {
609: my ($authdomain) = @_;
610: my $login_help = 1;
611: my $lang = &Apache::lonlocal::current_language();
612: if ($login_help) {
613: my $dom = $authdomain;
614: if ($dom eq '') {
615: $dom = &Apache::lonnet::default_login_domain();
616: }
617: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
618: my $loginhelp_url;
619: if ($lang) {
620: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
621: if ($loginhelp_url ne '') {
622: return $loginhelp_url;
623: }
624: }
625: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
626: if ($loginhelp_url ne '') {
627: return $loginhelp_url;
628: } else {
629: return '/adm/loginproblems.html';
630: }
631: }
632: return;
633: }
634:
635: 1;
636: __END__
637:
638:
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