1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.133 2014/04/06 13:40:19 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::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: );
143: my $loginhelp = &loginhelpdisplay($domain);
144: if ($loginhelp) {
145: $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
146: }
147:
148: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
149: $r->print(<<ENDSUCCESS);
150: $start_page
151: $windowinfo
152: <h1>$lt{'wel'}</h1>
153: $welcome
154: $loginhelp
155: $continuelink
156: $end_page
157: ENDSUCCESS
158: }
159:
160: # --------------------------------------------------------------- Failed login!
161:
162: sub failed {
163: my ($r,$message,$form) = @_;
164: (undef,undef,undef,my $clientmathml,my $clientunicode) =
165: &Apache::loncommon::decode_user_agent();
166: my $args = {};
167: if ($clientunicode && !$clientmathml) {
168: $args = {'browser.unicode' => 1};
169: }
170:
171: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
172: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
173: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
174: if (&Apache::lonnet::domain($udom,'description') eq '') {
175: undef($udom);
176: }
177: my $retry = '/adm/login';
178: if ($uname eq $form->{'uname'}) {
179: $retry .= '?username='.$uname;
180: }
181: if ($udom) {
182: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
183: }
184: if (exists($form->{role})) {
185: my $role = &Apache::loncommon::cleanup_html($form->{role});
186: if ($role ne '') {
187: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
188: }
189: }
190: if (exists($form->{symb})) {
191: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
192: if ($symb ne '') {
193: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
194: }
195: }
196: my $end_page = &Apache::loncommon::end_page();
197: &Apache::loncommon::content_type($r,'text/html');
198: $r->send_http_header;
199: my @actions =
200: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
201: my $loginhelp = &loginhelpdisplay($udom);
202: if ($loginhelp) {
203: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
204: }
205: #FIXME: link to helpdesk might be added here
206:
207: $r->print(
208: $start_page
209: .'<h2>'.&mt('Sorry ...').'</h2>'
210: .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
211: .&Apache::lonhtmlcommon::actionbox(\@actions)
212: .$end_page
213: );
214: }
215:
216: # ------------------------------------------------------------------ Rerouting!
217:
218: sub reroute {
219: my ($r) = @_;
220: &Apache::loncommon::content_type($r,'text/html');
221: $r->send_http_header;
222: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
223: .&mt('Please [_1]log in again[_2].');
224: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
225: }
226:
227: # ---------------------------------------------------------------- Main handler
228:
229: sub handler {
230: my $r = shift;
231: my $londocroot = $r->dir_config('lonDocRoot');
232: my $form;
233: # Are we re-routing?
234: if (-e "$londocroot/lon-status/reroute.txt") {
235: &reroute($r);
236: return OK;
237: }
238:
239: &Apache::lonlocal::get_language_handle($r);
240:
241: # -------------------------------- Prevent users from attempting to login twice
242: my $handle = &Apache::lonnet::check_for_valid_session($r);
243: if ($handle ne '') {
244: my $lonidsdir=$r->dir_config('lonIDsDir');
245: if ($handle=~/^publicuser\_/) {
246: # For "public user" - remove it, we apparently really want to login
247: unlink($r->dir_config('lonIDsDir')."/$handle.id");
248: } else {
249: # Indeed, a valid token is found
250: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
251: &Apache::loncommon::content_type($r,'text/html');
252: $r->send_http_header;
253: my $start_page =
254: &Apache::loncommon::start_page('Already logged in');
255: my $end_page =
256: &Apache::loncommon::end_page();
257: my $dest = '/adm/roles';
258: if ($env{'form.firsturl'} ne '') {
259: $dest = $env{'form.firsturl'};
260: }
261: $r->print(
262: $start_page
263: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
264: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
265: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
266: .'</p>'
267: .$end_page
268: );
269: return OK;
270: }
271: }
272:
273: # ---------------------------------------------------- No valid token, continue
274:
275:
276: my $buffer;
277: if ($r->header_in('Content-length') > 0) {
278: $r->read($buffer,$r->header_in('Content-length'),0);
279: }
280: my %form;
281: foreach my $pair (split(/&/,$buffer)) {
282: my ($name,$value) = split(/=/,$pair);
283: $value =~ tr/+/ /;
284: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
285: $form{$name}=$value;
286: }
287:
288: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
289: &failed($r,'Username, password and domain need to be specified.',
290: \%form);
291: return OK;
292: }
293:
294: # split user logging in and "su"-user
295:
296: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
297: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
298: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
299: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
300:
301: my $role = $r->dir_config('lonRole');
302: my $domain = $r->dir_config('lonDefDomain');
303: my $prodir = $r->dir_config('lonUsersDir');
304: my $contact_name = &mt('LON-CAPA helpdesk');
305:
306: # ---------------------------------------- Get the information from login token
307:
308: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
309: $form{'serverid'});
310:
311: my %sessiondata;
312: if ($form{'iptoken'}) {
313: %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
314: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
315: }
316:
317: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
318: ($tmpinfo eq 'no_such_host')) {
319: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
320: return OK;
321: } else {
322: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
323: $form{'serverid'});
324: if ( $reply ne 'ok' ) {
325: &failed($r,'Session could not be opened.',\%form);
326: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
327: return OK;
328: }
329: }
330:
331: if (!&Apache::lonnet::domain($form{'udom'})) {
332: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
333: return OK;
334: }
335:
336: my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
337: if ($rolestr) {
338: $rolestr = &unescape($rolestr);
339: }
340: if ($symbstr) {
341: $symbstr= &unescape($symbstr);
342: }
343: if ($rolestr =~ /^role=/) {
344: (undef,$form{'role'}) = split('=',$rolestr);
345: }
346: if ($symbstr =~ /^symb=/) {
347: (undef,$form{'symb'}) = split('=',$symbstr);
348: }
349:
350: my $keybin=pack("H16",$key);
351:
352: my $cipher;
353: if ($Crypt::DES::VERSION>=2.03) {
354: $cipher=new Crypt::DES $keybin;
355: }
356: else {
357: $cipher=new DES $keybin;
358: }
359: my $upass='';
360: for (my $i=0;$i<=2;$i++) {
361: my $chunk=
362: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
363:
364: $chunk.=
365: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
366:
367: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
368: $upass.=$chunk;
369: }
370:
371: # ---------------------------------------------------------------- Authenticate
372:
373: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
374: my ($cancreate,$statustocreate) =
375: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
376: my $defaultauth;
377: if (ref($cancreate) eq 'ARRAY') {
378: if (grep(/^login$/,@{$cancreate})) {
379: $defaultauth = 1;
380: }
381: }
382: my $clientcancheckhost = 1;
383: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
384: $form{'udom'},$defaultauth,
385: $clientcancheckhost);
386:
387: # --------------------------------------------------------------------- Failed?
388:
389: if ($authhost eq 'no_host') {
390: &failed($r,'Username and/or password could not be authenticated.',
391: \%form);
392: return OK;
393: } elsif ($authhost eq 'no_account_on_host') {
394: if ($defaultauth) {
395: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
396: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
397: return OK;
398: }
399: my $start_page =
400: &Apache::loncommon::start_page('Create a user account in LON-CAPA');
401: my $lonhost = $r->dir_config('lonHostID');
402: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
403: my $contacts =
404: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
405: $form{'udom'},$origmail);
406: my ($contact_email) = split(',',$contacts);
407: my $output =
408: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
409: $domdesc,'',$lonhost,
410: $contact_email,$contact_name,
411: undef,$statustocreate);
412: &Apache::loncommon::content_type($r,'text/html');
413: $r->send_http_header;
414: &Apache::createaccount::print_header($r,$start_page);
415: $r->print('<h3>'.&mt('Account creation').'</h3>'.
416: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
417: $output.&Apache::loncommon::end_page());
418: return OK;
419: } else {
420: &failed($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);
421: return OK;
422: }
423: }
424:
425: if (($firsturl eq '') ||
426: ($firsturl=~/^\/adm\/(logout|remote)/)) {
427: $firsturl='/adm/roles';
428: }
429:
430: my $hosthere;
431: if ($form{'iptoken'}) {
432: if (($sessiondata{'domain'} eq $form{'udom'}) &&
433: ($sessiondata{'username'} eq $form{'uname'})) {
434: $hosthere = 1;
435: }
436: }
437:
438: # --------------------------------- Are we attempting to login as somebody else?
439: if ($form{'suname'}) {
440: # ------------ see if the original user has enough privileges to pull this stunt
441: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
442: # ---------------------------------------------------- see if the su-user exists
443: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
444: eq 'no_host') {
445: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
446: # ------------------------------ see if the su-user is not too highly privileged
447: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
448: # -------------------------------------------------------- actually switch users
449: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
450: ' logging in as '.$form{'suname'});
451: $form{'uname'}=$form{'suname'};
452: } else {
453: &Apache::lonnet::logthis('Attempted switch user to privileged user');
454: }
455: }
456: } else {
457: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
458: }
459: }
460:
461: my ($is_balancer,$otherserver);
462:
463: unless ($hosthere) {
464: ($is_balancer,$otherserver) =
465: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
466: }
467:
468: if ($is_balancer) {
469: if (!$otherserver) {
470: ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
471: }
472: if ($otherserver) {
473: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
474: \%form);
475: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
476: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
477: $switchto .= '&origurl='.$firsturl;
478: }
479: if ($form{'role'}) {
480: $switchto .= '&role='.$form{'role'};
481: }
482: if ($form{'symb'}) {
483: $switchto .= '&symb='.$form{'symb'};
484: }
485: $r->internal_redirect($switchto);
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: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
497: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
498: $switchto .= '&origurl='.$firsturl;
499: }
500: if ($form{'role'}) {
501: $switchto .= '&role='.$form{'role'};
502: }
503: if ($form{'symb'}) {
504: $switchto .= '&symb='.$form{'symb'};
505: }
506: $r->internal_redirect($switchto);
507: } else {
508: $r->print(&noswitch());
509: }
510: return OK;
511: }
512:
513: # ------------------------------------------------------- Do the load balancing
514:
515: # ---------------------------------------------------------- Determine own load
516: my $loadlim = $r->dir_config('lonLoadLim');
517: my $loadavg;
518: {
519: my $loadfile=Apache::File->new('/proc/loadavg');
520: $loadavg=<$loadfile>;
521: }
522: $loadavg =~ s/\s.*//g;
523: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
524: my $userloadpercent=&Apache::lonnet::userload();
525:
526: # ---------------------------------------------------------- Are we overloaded?
527: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
528: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
529: if (!$unloaded) {
530: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
531: }
532: if ($unloaded) {
533: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
534: undef,\%form);
535: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
536: return OK;
537: }
538: }
539: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
540: \%form);
541: return OK;
542: }
543: }
544:
545: sub check_can_host {
546: my ($r,$form,$authhost,$domdesc) = @_;
547: return unless (ref($form) eq 'HASH');
548: my $canhost = 1;
549: my $lonhost = $r->dir_config('lonHostID');
550: my $udom = $form->{'udom'};
551: my @intdoms;
552: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
553: if (ref($internet_names) eq 'ARRAY') {
554: @intdoms = @{$internet_names};
555: }
556: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
557: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
558: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
559: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
560: my $hostname = &Apache::lonnet::hostname($lonhost);
561: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
562: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
563: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
564: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
565: my $loncaparev;
566: if ($authhost eq 'no_account_on_host') {
567: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
568: } else {
569: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
570: }
571: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
572: $udomdefaults{'remotesessions'},
573: $defdomdefaults{'hostedsessions'});
574: }
575: unless ($canhost) {
576: if ($authhost eq 'no_account_on_host') {
577: my $checkloginvia = 1;
578: my ($login_host,$hostname) =
579: &Apache::lonnet::choose_server($udom,$checkloginvia);
580: &Apache::loncommon::content_type($r,'text/html');
581: $r->send_http_header;
582: if ($login_host ne '') {
583: my $protocol = $Apache::lonnet::protocol{$login_host};
584: $protocol = 'http' if ($protocol ne 'https');
585: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
586: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
587: '<h3>'.&mt('Account creation').'</h3>'.
588: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
589: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
590: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
591: &Apache::loncommon::end_page());
592: } else {
593: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
594: '<h3>'.&mt('Account creation unavailable').'</h3>'.
595: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
596: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
597: &Apache::loncommon::end_page());
598: }
599: } else {
600: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
601: $form);
602: my ($otherserver) = &Apache::lonnet::choose_server($udom);
603: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
604: }
605: }
606: return $canhost;
607: }
608:
609: sub noswitch {
610: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
611: '<h3>'.&mt('Session unavailable').'</h3>'.
612: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
613: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
614: &Apache::loncommon::end_page();
615: return $result;
616: }
617:
618: sub loginhelpdisplay {
619: my ($authdomain) = @_;
620: my $login_help = 1;
621: my $lang = &Apache::lonlocal::current_language();
622: if ($login_help) {
623: my $dom = $authdomain;
624: if ($dom eq '') {
625: $dom = &Apache::lonnet::default_login_domain();
626: }
627: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
628: my $loginhelp_url;
629: if ($lang) {
630: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
631: if ($loginhelp_url ne '') {
632: return $loginhelp_url;
633: }
634: }
635: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
636: if ($loginhelp_url ne '') {
637: return $loginhelp_url;
638: } else {
639: return '/adm/loginproblems.html';
640: }
641: }
642: return;
643: }
644:
645: 1;
646: __END__
647:
648:
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