1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.121.2.22 2021/12/12 01:48:40 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 Apache::loncommon();
36: use Apache::lonnet;
37: use Apache::lonmenu();
38: use Apache::createaccount;
39: use Fcntl qw(:flock);
40: use Apache::lonlocal;
41: use Apache::File();
42: use HTML::Entities;
43: use Digest::MD5;
44:
45: # ------------------------------------------------------------ Successful login
46: sub success {
47: my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
48: $form,$cid,$expirepub) = @_;
49:
50: # ------------------------------------------------------------ Get cookie ready
51: my $cookie =
52: &Apache::loncommon::init_user_environment($r, $username, $domain,
53: $authhost, $form,
54: {'extra_env' => $extra_env,});
55:
56: my $public=($username eq 'public' && $domain eq 'public');
57:
58: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
59:
60: # -------------------------------------------------------------------- Log this
61:
62: my $ip = &Apache::lonnet::get_requestor_ip();
63: &Apache::lonnet::log($domain,$username,$authhost,
64: "Login $ip");
65:
66: # ------------------------------------------------- Check for critical messages
67:
68: my @what=&Apache::lonnet::dump('critical',$domain,$username);
69: if ($what[0]) {
70: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
71: $lowerurl='/adm/email?critical=display';
72: }
73: }
74:
75: # ------------------------------------------------------------ Get cookies ready
76: my ($securecookie,$defaultcookie);
77: my $ssl = $r->subprocess_env('https');
78: if ($ssl) {
79: $securecookie="lonSID=$cookie; path=/; HttpOnly; secure";
80: my $lonidsdir=$r->dir_config('lonIDsDir');
81: if (($lonidsdir) && (-e "$lonidsdir/$cookie.id")) {
82: my $linkname=substr(Digest::MD5::md5_hex(Digest::MD5::md5_hex(time(). {}. rand(). $$)), 0, 32).'_linked';
83: if (-e "$lonidsdir/$linkname.id") {
84: unlink("$lonidsdir/$linkname.id");
85: }
86: my $made_symlink = eval { symlink("$lonidsdir/$cookie.id",
87: "$lonidsdir/$linkname.id"); 1 };
88: if ($made_symlink) {
89: $defaultcookie = "lonLinkID=$linkname; path=/; HttpOnly;";
90: &Apache::lonnet::appenv({'user.linkedenv' => $linkname});
91: }
92: }
93: } else {
94: $defaultcookie = "lonID=$cookie; path=/; HttpOnly;";
95: }
96: # -------------------------------------------------------- Menu script and info
97: my $destination = $lowerurl;
98:
99: if (defined($form->{role})) {
100: my $envkey = 'user.role.'.$form->{role};
101: my $now=time;
102: my $then=$env{'user.login.time'};
103: my $refresh=$env{'user.refresh.time'};
104: my $update=$env{'user.update.time'};
105: if (!$update) {
106: $update = $then;
107: }
108: if (exists($env{$envkey})) {
109: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
110: &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
111: \$trolecode,\$tstatus,\$tstart,\$tend);
112: if ($tstatus eq 'is') {
113: $destination .= ($destination =~ /\?/) ? '&' : '?';
114: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
115: $destination .= 'selectrole=1&'.$newrole.'=1';
116: }
117: }
118: }
119: if (defined($form->{symb})) {
120: my $destsymb = $form->{symb};
121: my $encrypted;
122: if ($destsymb =~ m{^/enc/}) {
123: $encrypted = 1;
124: if ($cid) {
125: $destsymb = &Apache::lonenc::unencrypted($destsymb,$cid);
126: }
127: }
128: $destination .= ($destination =~ /\?/) ? '&' : '?';
129: if ($destsymb =~ /___/) {
130: my ($map,$resid,$desturl)=split(/___/,$destsymb);
131: $desturl = &Apache::lonnet::clutter($desturl);
132: if ($encrypted) {
133: $desturl = &Apache::lonenc::encrypted($desturl,1,$cid);
134: $destsymb = $form->{symb};
135: }
136: $desturl = &HTML::Entities::encode($desturl,'"<>&');
137: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
138: $destination .= 'destinationurl='.$desturl.
139: '&destsymb='.$destsymb;
140: } elsif (!$encrypted) {
141: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
142: $destination .= 'destinationurl='.$destsymb;
143: }
144: }
145: if ($destination =~ m{^/adm/roles}) {
146: $destination .= ($destination =~ /\?/) ? '&' : '?';
147: $destination .= 'source=login';
148: }
149:
150: my $windowinfo=&Apache::lonmenu::open($env{'browser.os'});
151: my $startupremote=&Apache::lonmenu::startupremote($destination);
152: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
153: my $setflags=&Apache::lonmenu::setflags();
154: my $maincall=&Apache::lonmenu::maincall();
155: my $brcrum = [{'href' => '',
156: 'text' => 'Successful Login'},];
157: my $start_page=&Apache::loncommon::start_page('Successful Login',
158: $startupremote,
159: {'no_inline_link' => 1,
160: 'bread_crumbs' => $brcrum,});
161: my $end_page =&Apache::loncommon::end_page();
162:
163: my $continuelink;
164: if ($env{'environment.remote'} eq 'off') {
165: $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
166: }
167: # ------------------------------------------------- Output for successful login
168:
169: &Apache::loncommon::content_type($r,'text/html');
170: if ($securecookie) {
171: $r->headers_out->add('Set-cookie' => $securecookie);
172: }
173: if ($defaultcookie) {
174: $r->headers_out->add('Set-cookie' => $defaultcookie);
175: }
176: if ($expirepub) {
177: my $c = new CGI::Cookie(-name => 'lonPubID',
178: -value => '',
179: -expires => '-10y',);
180: $r->headers_out->add('Set-cookie' => $c);
181: }
182: $r->send_http_header;
183:
184: my %lt=&Apache::lonlocal::texthash(
185: 'wel' => 'Welcome',
186: 'pro' => 'Login problems?',
187: );
188: my $loginhelp = &loginhelpdisplay($domain);
189: if ($loginhelp) {
190: $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
191: }
192:
193: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
194: $r->print(<<ENDSUCCESS);
195: $start_page
196: $setflags
197: $windowinfo
198: <h1>$lt{'wel'}</h1>
199: $welcome
200: $loginhelp
201: $remoteinfo
202: $maincall
203: $continuelink
204: $end_page
205: ENDSUCCESS
206: return;
207: }
208:
209: # --------------------------------------------------------------- Failed login!
210:
211: sub failed {
212: my ($r,$message,$form,$authhost) = @_;
213: (undef,undef,undef,my $clientmathml,my $clientunicode) =
214: &Apache::loncommon::decode_user_agent();
215: my $args = {};
216: if ($clientunicode && !$clientmathml) {
217: $args = {'browser.unicode' => 1};
218: }
219:
220: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
221: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
222: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
223: if (&Apache::lonnet::domain($udom,'description') eq '') {
224: undef($udom);
225: }
226: my $retry = '/adm/login';
227: if ($uname eq $form->{'uname'}) {
228: $retry .= '?username='.$uname;
229: }
230: if ($udom) {
231: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
232: }
233: my $lonhost = $r->dir_config('lonHostID');
234: my $querystr;
235: my $result = &set_retry_token($form,$lonhost,\$querystr);
236: if ($result eq 'fail') {
237: if (exists($form->{role})) {
238: my $role = &Apache::loncommon::cleanup_html($form->{role});
239: if ($role ne '') {
240: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
241: }
242: }
243: if (exists($form->{symb})) {
244: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
245: if ($symb ne '') {
246: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
247: }
248: }
249: if (exists($form->{firsturl})) {
250: my $firsturl = &Apache::loncommon::cleanup_html($form->{firsturl});
251: if ($firsturl ne '') {
252: $retry .= (($retry=~/\?/)?'&':'?').'firsturl='.$firsturl;
253: if ($form->{firsturl} =~ m{^/tiny/$match_domain/\w+$}) {
254: unless (exists($form->{linkprot})) {
255: if (exists($form->{linkkey})) {
256: $retry .= 'linkkey='.$form->{linkkey};
257: }
258: }
259: }
260: }
261: }
262: } elsif ($querystr ne '') {
263: $retry .= (($retry=~/\?/)?'&':'?').$querystr;
264: }
265: my $end_page = &Apache::loncommon::end_page();
266: &Apache::loncommon::content_type($r,'text/html');
267: $r->send_http_header;
268: my @actions =
269: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
270: my $loginhelp = &loginhelpdisplay($udom);
271: if ($loginhelp) {
272: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
273: }
274: #FIXME: link to helpdesk might be added here
275:
276: $r->print(
277: $start_page
278: .'<h2>'.&mt('Sorry ...').'</h2>'
279: .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
280: .&Apache::lonhtmlcommon::actionbox(\@actions)
281: .$end_page
282: );
283: }
284:
285: # ------------------------------------------------------------------ Rerouting!
286:
287: sub reroute {
288: my ($r) = @_;
289: &Apache::loncommon::content_type($r,'text/html');
290: $r->send_http_header;
291: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
292: .&mt('Please [_1]log in again[_2].');
293: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
294: }
295:
296: # ---------------------------------------------------------------- Main handler
297:
298: sub handler {
299: my $r = shift;
300: my $londocroot = $r->dir_config('lonDocRoot');
301: # Are we re-routing?
302: if (-e "$londocroot/lon-status/reroute.txt") {
303: &reroute($r);
304: return OK;
305: }
306:
307: &Apache::lonlocal::get_language_handle($r);
308:
309: # -------------------------------- Prevent users from attempting to login twice
310: my $handle = &Apache::lonnet::check_for_valid_session($r);
311: if ($handle ne '') {
312: my $lonidsdir=$r->dir_config('lonIDsDir');
313: if ($handle=~/^publicuser\_/) {
314: # For "public user" - remove it, we apparently really want to login
315: unlink($r->dir_config('lonIDsDir')."/$handle.id");
316: } else {
317: # Indeed, a valid token is found
318: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
319: &Apache::loncommon::content_type($r,'text/html');
320: $r->send_http_header;
321: my $start_page =
322: &Apache::loncommon::start_page('Already logged in');
323: my $end_page =
324: &Apache::loncommon::end_page();
325: my $dest = '/adm/roles';
326: my %form = &get_form_items($r);
327: if ($form{'logtoken'}) {
328: my $tmpinfo = &Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
329: $form{'serverid'});
330: unless (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
331: ($tmpinfo eq 'no_such_host')) {
332: my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo)l
333: $firsturl = &unescape($firsturl);
334: my %info;
335: foreach my $item (@rest) {
336: my ($key,$value) = split(/=/,$item);
337: $info{$key} = &unescape($value);
338: }
339: if ($firsturl ne '') {
340: $info{'firsturl'} = $firsturl;
341: $dest = $firsturl;
342: }
343: }
344: }
345: $r->print(
346: $start_page
347: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
348: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
349: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
350: .'</p>'
351: .$end_page
352: );
353: return OK;
354: }
355: }
356:
357: # ---------------------------------------------------- No valid token, continue
358:
359: my %form = &get_form_items($r);
360: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
361: &failed($r,'Username, password and domain need to be specified.',
362: \%form);
363: return OK;
364: }
365:
366: # split user logging in and "su"-user
367:
368: ($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
369: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
370: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
371: $form{'udom'} = &LONCAPA::clean_domain($form{'udom'});
372: $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
373:
374: my $role = $r->dir_config('lonRole');
375: my $domain = $r->dir_config('lonDefDomain');
376: my $prodir = $r->dir_config('lonUsersDir');
377: my $contact_name = &mt('LON-CAPA helpdesk');
378:
379: # ---------------------------------------- Get the information from login token
380:
381: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
382: $form{'serverid'});
383:
384: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
385: ($tmpinfo eq 'no_such_host')) {
386: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
387: return OK;
388: } else {
389: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
390: $form{'serverid'});
391: if ( $reply ne 'ok' ) {
392: &failed($r,'Session could not be opened.',\%form);
393: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
394: return OK;
395: }
396: }
397:
398: if (!&Apache::lonnet::domain($form{'udom'})) {
399: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
400: return OK;
401: }
402:
403: my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
404: $firsturl = &unescape($firsturl);
405: foreach my $item (@rest) {
406: my ($key,$value) = split(/=/,$item);
407: $form{$key} = &unescape($value);
408: }
409: my $upass = &Apache::loncommon::des_decrypt($key,$form{'upass0'});
410:
411: # ---------------------------------------------------------------- Authenticate
412:
413: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
414: my ($cancreate,$statustocreate) =
415: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
416: my $defaultauth;
417: if (ref($cancreate) eq 'ARRAY') {
418: if (grep(/^login$/,@{$cancreate})) {
419: $defaultauth = 1;
420: }
421: }
422: my $clientcancheckhost = 1;
423: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
424: $form{'udom'},$defaultauth,
425: $clientcancheckhost);
426:
427: # --------------------------------------------------------------------- Failed?
428:
429: if ($authhost eq 'no_host') {
430: &failed($r,'Username and/or password could not be authenticated.',
431: \%form);
432: return OK;
433: } elsif ($authhost eq 'no_account_on_host') {
434: if ($defaultauth) {
435: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
436: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
437: return OK;
438: }
439: my $start_page =
440: &Apache::loncommon::start_page('Create a user account in LON-CAPA',
441: '',{'no_inline_link' => 1,});
442: my $lonhost = $r->dir_config('lonHostID');
443: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
444: my $contacts =
445: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
446: $form{'udom'},$origmail);
447: my ($contact_email) = split(',',$contacts);
448: my $output =
449: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
450: $domdesc,'',$lonhost,
451: $contact_email,$contact_name,
452: undef,$statustocreate);
453: &Apache::loncommon::content_type($r,'text/html');
454: $r->send_http_header;
455: &Apache::createaccount::print_header($r,$start_page);
456: $r->print('<h3>'.&mt('Account creation').'</h3>'.
457: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
458: $output.&Apache::loncommon::end_page());
459: return OK;
460: } else {
461: &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);
462: return OK;
463: }
464: }
465:
466: if (($firsturl eq '') ||
467: ($firsturl=~/^\/adm\/(logout|remote)/)) {
468: $firsturl='/adm/roles';
469: }
470:
471: my $hosthere;
472: if ($form{'iptoken'}) {
473: my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
474: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
475: if (($sessiondata{'domain'} eq $form{'udom'}) &&
476: ($sessiondata{'username'} eq $form{'uname'})) {
477: $hosthere = 1;
478: }
479: }
480:
481: # --------------------------------- Are we attempting to login as somebody else?
482: if ($form{'suname'}) {
483: my ($suname,$sudom,$sudomref);
484: $suname = $form{'suname'};
485: $sudom = $form{'udom'};
486: if ($form{'sudom'}) {
487: unless ($sudom eq $form{'sudom'}) {
488: if (&Apache::lonnet::domain($form{'sudom'})) {
489: $sudomref = [$form{'sudom'}];
490: $sudom = $form{'sudom'};
491: }
492: }
493: }
494: # ------------ see if the original user has enough privileges to pull this stunt
495: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
496: # ---------------------------------------------------- see if the su-user exists
497: unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
498: # ------------------------------ see if the su-user is not too highly privileged
499: if (&Apache::lonnet::privileged($suname,$sudom)) {
500: &Apache::lonnet::logthis('Attempted switch user to privileged user');
501: } else {
502: my $noprivswitch;
503: #
504: # su-user's home server and user's home server must have one of:
505: # (a) same domain
506: # (b) same primary library server for the two domains
507: # (c) same "internet domain" for primary library server(s) for home servers' domains
508: #
509: my $suprim = &Apache::lonnet::domain($sudom,'primary');
510: my $suintdom = &Apache::lonnet::internet_dom($suprim);
511: unless ($sudom eq $form{'udom'}) {
512: my $uprim = &Apache::lonnet::domain($form{'udom'},'primary');
513: my $uintdom = &Apache::lonnet::internet_dom($uprim);
514: unless ($suprim eq $uprim) {
515: unless ($suintdom eq $uintdom) {
516: &Apache::lonnet::logthis('Attempted switch user '
517: .'to user with different "internet domain".');
518: $noprivswitch = 1;
519: }
520: }
521: }
522:
523: unless ($noprivswitch) {
524: #
525: # server where log-in occurs must have same "internet domain" as su-user's home
526: # server
527: #
528: my $lonhost = $r->dir_config('lonHostID');
529: my $hostintdom = &Apache::lonnet::internet_dom($lonhost);
530: if ($hostintdom ne $suintdom) {
531: &Apache::lonnet::logthis('Attempted switch user on a '
532: .'server with a different "internet domain".');
533: } else {
534:
535: # -------------------------------------------------------- actually switch users
536:
537: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.
538: $form{'udom'}.' logging in as '.$suname.':'.$sudom);
539: $form{'uname'}=$suname;
540: if ($form{'udom'} ne $sudom) {
541: $form{'udom'}=$sudom;
542: }
543: }
544: }
545: }
546: }
547: } else {
548: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
549: }
550: }
551:
552: my ($is_balancer,$otherserver);
553:
554: unless ($hosthere) {
555: ($is_balancer,$otherserver) =
556: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
557: if ($is_balancer) {
558: # Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
559: my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
560: if (($found_server) && ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
561: $otherserver = $found_server;
562: }
563: if ($otherserver eq '') {
564: my $lowest_load;
565: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
566: if ($lowest_load > 100) {
567: $otherserver = &Apache::lonnet::spareserver($r,$lowest_load,$lowest_load,1,$form{'udom'});
568: }
569: }
570: if ($otherserver ne '') {
571: my @hosts = &Apache::lonnet::current_machine_ids();
572: if (grep(/^\Q$otherserver\E$/,@hosts)) {
573: $hosthere = $otherserver;
574: }
575: }
576: }
577: }
578:
579: if (($is_balancer) && (!$hosthere)) {
580: if ($otherserver) {
581: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
582: \%form);
583: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
584: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
585: $switchto .= '&origurl='.$firsturl;
586: }
587: if ($form{'role'}) {
588: $switchto .= '&role='.$form{'role'};
589: }
590: if ($form{'symb'}) {
591: $switchto .= '&symb='.$form{'symb'};
592: }
593: $r->internal_redirect($switchto);
594: } else {
595: &Apache::loncommon::content_type($r,'text/html');
596: $r->send_http_header;
597: $r->print(&noswitch());
598: }
599: return OK;
600: } else {
601: if (!&check_can_host($r,\%form,$authhost)) {
602: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
603: if ($otherserver) {
604: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
605: \%form);
606: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
607: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
608: $switchto .= '&origurl='.$firsturl;
609: }
610: if ($form{'role'}) {
611: $switchto .= '&role='.$form{'role'};
612: }
613: if ($form{'symb'}) {
614: $switchto .= '&symb='.$form{'symb'};
615: }
616: $r->internal_redirect($switchto);
617: } else {
618: &Apache::loncommon::content_type($r,'text/html');
619: $r->send_http_header;
620: $r->print(&noswitch());
621: }
622: return OK;
623: }
624:
625: # ------------------------------------------------------- Do the load balancing
626:
627: # ---------------------------------------------------------- Determine own load
628: my $loadlim = $r->dir_config('lonLoadLim');
629: my $loadavg;
630: {
631: my $loadfile=Apache::File->new('/proc/loadavg');
632: $loadavg=<$loadfile>;
633: }
634: $loadavg =~ s/\s.*//g;
635: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
636: my $userloadpercent=&Apache::lonnet::userload();
637:
638: # ---------------------------------------------------------- Are we overloaded?
639: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
640: my $unloaded=Apache::lonnet::spareserver($r,$loadpercent,$userloadpercent,1,$form{'udom'});
641: if (!$unloaded) {
642: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
643: }
644: if ($unloaded) {
645: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
646: undef,\%form);
647: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
648: return OK;
649: }
650: }
651: if (($is_balancer) && ($hosthere)) {
652: $form{'noloadbalance'} = $hosthere;
653: }
654: my $extra_env;
655: if (($hosthere) && ($sessiondata{'sessionserver'} ne '')) {
656: if ($sessiondata{'origurl'} ne '') {
657: $firsturl = $sessiondata{'origurl'};
658: $form{'firsturl'} = $sessiondata{'origurl'};
659: my @names = ('role','symb','linkprot','linkkey');
660: foreach my $item (@names) {
661: if ($sessiondata{$item} ne '') {
662: $form{$item} = $sessiondata{$item};
663: }
664: }
665: }
666: }
667: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
668: \%form);
669: return OK;
670: }
671: }
672:
673: sub get_form_items {
674: my ($r) = @_;
675: my $buffer;
676: if ($r->header_in('Content-length') > 0) {
677: $r->read($buffer,$r->header_in('Content-length'),0);
678: }
679: my %form;
680: foreach my $pair (split(/&/,$buffer)) {
681: my ($name,$value) = split(/=/,$pair);
682: $value =~ tr/+/ /;
683: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
684: $form{$name}=$value;
685: }
686: return %form;
687: }
688:
689: sub set_retry_token {
690: my ($form,$lonhost,$querystr) = @_;
691: if (ref($form) eq 'HASH') {
692: my ($firsturl,$token,$extras,@names);
693: @names = ('role','symb','iptoken');
694: foreach my $name (@names) {
695: if ($form->{$name} ne '') {
696: $extras .= '&'.$name.'='.&escape($form->{$name});
697: last if ($name eq 'linkprot');
698: }
699: }
700: my $firsturl = $form->{'firsturl'};
701: if (($firsturl ne '') || ($extras ne '')) {
702: $extras .= ':retry';
703: $token = &Apache::lonnet::reply('tmpput:'.&escape($firsturl).
704: $extras,$lonhost);
705: if (($token eq 'con_lost') || ($token eq 'no_such_host')) {
706: return 'fail';
707: } else {
708: if (ref($querystr)) {
709: $$querystr = 'retry='.$token;
710: }
711: return 'ok';
712: }
713: }
714: }
715: return;
716: }
717:
718: sub check_can_host {
719: my ($r,$form,$authhost,$domdesc) = @_;
720: return unless (ref($form) eq 'HASH');
721: my $canhost = 1;
722: my $lonhost = $r->dir_config('lonHostID');
723: my $udom = $form->{'udom'};
724: my @intdoms;
725: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
726: if (ref($internet_names) eq 'ARRAY') {
727: @intdoms = @{$internet_names};
728: }
729: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
730: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
731: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
732: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
733: my $hostname = &Apache::lonnet::hostname($lonhost);
734: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
735: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
736: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
737: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
738: my $loncaparev;
739: if ($authhost eq 'no_account_on_host') {
740: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
741: } else {
742: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
743: }
744: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
745: $udomdefaults{'remotesessions'},
746: $defdomdefaults{'hostedsessions'});
747: }
748: unless ($canhost) {
749: if ($authhost eq 'no_account_on_host') {
750: my $checkloginvia = 1;
751: my ($login_host,$hostname) =
752: &Apache::lonnet::choose_server($udom,$checkloginvia);
753: &Apache::loncommon::content_type($r,'text/html');
754: $r->send_http_header;
755: if ($login_host ne '') {
756: my $protocol = $Apache::lonnet::protocol{$login_host};
757: $protocol = 'http' if ($protocol ne 'https');
758: my $alias = &Apache::lonnet::use_proxy_alias($r,$login_host);
759: $hostname = $alias if ($alias ne '');
760: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
761: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
762: '<h3>'.&mt('Account creation').'</h3>'.
763: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
764: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
765: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
766: &Apache::loncommon::end_page());
767: } else {
768: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
769: '<h3>'.&mt('Account creation unavailable').'</h3>'.
770: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
771: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
772: &Apache::loncommon::end_page());
773: }
774: } else {
775: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
776: $form);
777: my ($otherserver) = &Apache::lonnet::choose_server($udom);
778: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
779: }
780: }
781: return $canhost;
782: }
783:
784: sub noswitch {
785: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
786: '<h3>'.&mt('Session unavailable').'</h3>'.
787: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
788: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
789: &Apache::loncommon::end_page();
790: return $result;
791: }
792:
793: sub loginhelpdisplay {
794: my ($authdomain) = @_;
795: my $login_help = 1;
796: my $lang = &Apache::lonlocal::current_language();
797: if ($login_help) {
798: my $dom = $authdomain;
799: if ($dom eq '') {
800: $dom = &Apache::lonnet::default_login_domain();
801: }
802: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
803: my $loginhelp_url;
804: if ($lang) {
805: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
806: if ($loginhelp_url ne '') {
807: return $loginhelp_url;
808: }
809: }
810: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
811: if ($loginhelp_url ne '') {
812: return $loginhelp_url;
813: } else {
814: return '/adm/loginproblems.html';
815: }
816: }
817: return;
818: }
819:
820: 1;
821: __END__
822:
823:
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