1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.121.2.26 2022/02/28 01:07:15 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 qw(:DEFAULT :match);
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: use CGI::Cookie();
45:
46: # ------------------------------------------------------------ Successful login
47: sub success {
48: my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
49: $form,$cid,$expirepub) = @_;
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: my $ip = &Apache::lonnet::get_requestor_ip();
64: &Apache::lonnet::log($domain,$username,$authhost,
65: "Login $ip");
66:
67: # ------------------------------------------------- Check for critical messages
68:
69: my @what=&Apache::lonnet::dump('critical',$domain,$username);
70: if ($what[0]) {
71: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
72: $lowerurl='/adm/email?critical=display';
73: }
74: }
75:
76: # ------------------------------------------------------------ Get cookies ready
77: my ($securecookie,$defaultcookie);
78: my $ssl = $r->subprocess_env('https');
79: if ($ssl) {
80: $securecookie="lonSID=$cookie; path=/; HttpOnly; secure";
81: my $lonidsdir=$r->dir_config('lonIDsDir');
82: if (($lonidsdir) && (-e "$lonidsdir/$cookie.id")) {
83: my $linkname=substr(Digest::MD5::md5_hex(Digest::MD5::md5_hex(time(). {}. rand(). $$)), 0, 32).'_linked';
84: if (-e "$lonidsdir/$linkname.id") {
85: unlink("$lonidsdir/$linkname.id");
86: }
87: my $made_symlink = eval { symlink("$lonidsdir/$cookie.id",
88: "$lonidsdir/$linkname.id"); 1 };
89: if ($made_symlink) {
90: $defaultcookie = "lonLinkID=$linkname; path=/; HttpOnly;";
91: &Apache::lonnet::appenv({'user.linkedenv' => $linkname});
92: }
93: }
94: } else {
95: $defaultcookie = "lonID=$cookie; path=/; HttpOnly;";
96: }
97: # -------------------------------------------------------- Menu script and info
98: my $destination = $lowerurl;
99:
100: if (defined($form->{role})) {
101: my $envkey = 'user.role.'.$form->{role};
102: my $now=time;
103: my $then=$env{'user.login.time'};
104: my $refresh=$env{'user.refresh.time'};
105: my $update=$env{'user.update.time'};
106: if (!$update) {
107: $update = $then;
108: }
109: if (exists($env{$envkey})) {
110: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
111: &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
112: \$trolecode,\$tstatus,\$tstart,\$tend);
113: if ($tstatus eq 'is') {
114: $destination .= ($destination =~ /\?/) ? '&' : '?';
115: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
116: $destination .= 'selectrole=1&'.$newrole.'=1';
117: }
118: }
119: }
120: if (defined($form->{symb})) {
121: my $destsymb = $form->{symb};
122: my $encrypted;
123: if ($destsymb =~ m{^/enc/}) {
124: $encrypted = 1;
125: if ($cid) {
126: $destsymb = &Apache::lonenc::unencrypted($destsymb,$cid);
127: }
128: }
129: $destination .= ($destination =~ /\?/) ? '&' : '?';
130: if ($destsymb =~ /___/) {
131: my ($map,$resid,$desturl)=split(/___/,$destsymb);
132: $desturl = &Apache::lonnet::clutter($desturl);
133: if ($encrypted) {
134: $desturl = &Apache::lonenc::encrypted($desturl,1,$cid);
135: $destsymb = $form->{symb};
136: }
137: $desturl = &HTML::Entities::encode($desturl,'"<>&');
138: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
139: $destination .= 'destinationurl='.$desturl.
140: '&destsymb='.$destsymb;
141: } elsif (!$encrypted) {
142: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
143: $destination .= 'destinationurl='.$destsymb;
144: }
145: }
146: if ($destination =~ m{^/adm/roles}) {
147: $destination .= ($destination =~ /\?/) ? '&' : '?';
148: $destination .= 'source=login';
149: }
150:
151: my $windowinfo=&Apache::lonmenu::open($env{'browser.os'});
152: my $startupremote=&Apache::lonmenu::startupremote($destination);
153: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
154: my $setflags=&Apache::lonmenu::setflags();
155: my $maincall=&Apache::lonmenu::maincall();
156: my $brcrum = [{'href' => '',
157: 'text' => 'Successful Login'},];
158: my $start_page=&Apache::loncommon::start_page('Successful Login',
159: $startupremote,
160: {'no_inline_link' => 1,
161: 'bread_crumbs' => $brcrum,});
162: my $end_page =&Apache::loncommon::end_page();
163:
164: my $continuelink;
165: if ($env{'environment.remote'} eq 'off') {
166: $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
167: }
168: # ------------------------------------------------- Output for successful login
169:
170: &Apache::loncommon::content_type($r,'text/html');
171: if ($securecookie) {
172: $r->headers_out->add('Set-cookie' => $securecookie);
173: }
174: if ($defaultcookie) {
175: $r->headers_out->add('Set-cookie' => $defaultcookie);
176: }
177: if ($expirepub) {
178: my $c = new CGI::Cookie(-name => 'lonPubID',
179: -value => '',
180: -expires => '-10y',);
181: $r->headers_out->add('Set-cookie' => $c);
182: }
183: $r->send_http_header;
184:
185: my %lt=&Apache::lonlocal::texthash(
186: 'wel' => 'Welcome',
187: 'pro' => 'Login problems?',
188: );
189: my $loginhelp = &loginhelpdisplay($domain);
190: if ($loginhelp) {
191: $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
192: }
193:
194: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
195: $r->print(<<ENDSUCCESS);
196: $start_page
197: $setflags
198: $windowinfo
199: <h1>$lt{'wel'}</h1>
200: $welcome
201: $loginhelp
202: $remoteinfo
203: $maincall
204: $continuelink
205: $end_page
206: ENDSUCCESS
207: return;
208: }
209:
210: # --------------------------------------------------------------- Failed login!
211:
212: sub failed {
213: my ($r,$message,$form,$authhost) = @_;
214: (undef,undef,undef,my $clientmathml,my $clientunicode) =
215: &Apache::loncommon::decode_user_agent();
216: my $args = {};
217: if ($clientunicode && !$clientmathml) {
218: $args = {'browser.unicode' => 1};
219: }
220:
221: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
222: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
223: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
224: if (&Apache::lonnet::domain($udom,'description') eq '') {
225: undef($udom);
226: }
227: my $retry = '/adm/login';
228: if ($uname eq $form->{'uname'}) {
229: $retry .= '?username='.$uname;
230: }
231: if ($udom) {
232: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
233: }
234: my $lonhost = $r->dir_config('lonHostID');
235: my $querystr;
236: my $result = &set_retry_token($form,$lonhost,\$querystr);
237: if ($result eq 'fail') {
238: if (exists($form->{role})) {
239: my $role = &Apache::loncommon::cleanup_html($form->{role});
240: if ($role ne '') {
241: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
242: }
243: }
244: if (exists($form->{symb})) {
245: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
246: if ($symb ne '') {
247: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
248: }
249: }
250: if (exists($form->{firsturl})) {
251: my $firsturl = &Apache::loncommon::cleanup_html($form->{firsturl});
252: if ($firsturl ne '') {
253: $retry .= (($retry=~/\?/)?'&':'?').'firsturl='.$firsturl;
254: }
255: }
256: } elsif ($querystr ne '') {
257: $retry .= (($retry=~/\?/)?'&':'?').$querystr;
258: }
259: my $end_page = &Apache::loncommon::end_page();
260: &Apache::loncommon::content_type($r,'text/html');
261: $r->send_http_header;
262: my @actions =
263: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
264: my $loginhelp = &loginhelpdisplay($udom);
265: if ($loginhelp) {
266: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
267: }
268: #FIXME: link to helpdesk might be added here
269:
270: $r->print(
271: $start_page
272: .'<h2>'.&mt('Sorry ...').'</h2>'
273: .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
274: .&Apache::lonhtmlcommon::actionbox(\@actions)
275: .$end_page
276: );
277: }
278:
279: # ------------------------------------------------------------------ Rerouting!
280:
281: sub reroute {
282: my ($r) = @_;
283: &Apache::loncommon::content_type($r,'text/html');
284: $r->send_http_header;
285: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
286: .&mt('Please [_1]log in again[_2].');
287: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
288: }
289:
290: # ---------------------------------------------------------------- Main handler
291:
292: sub handler {
293: my $r = shift;
294: my $londocroot = $r->dir_config('lonDocRoot');
295: # Are we re-routing?
296: if (-e "$londocroot/lon-status/reroute.txt") {
297: &reroute($r);
298: return OK;
299: }
300:
301: &Apache::lonlocal::get_language_handle($r);
302:
303: # -------------------------------- Prevent users from attempting to login twice
304: my $handle = &Apache::lonnet::check_for_valid_session($r);
305: if ($handle ne '') {
306: my $lonidsdir=$r->dir_config('lonIDsDir');
307: if ($handle=~/^publicuser\_/) {
308: # For "public user" - remove it, we apparently really want to login
309: unlink($r->dir_config('lonIDsDir')."/$handle.id");
310: } else {
311: # Indeed, a valid token is found
312: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
313: &Apache::loncommon::content_type($r,'text/html');
314: $r->send_http_header;
315: my $start_page =
316: &Apache::loncommon::start_page('Already logged in');
317: my $end_page =
318: &Apache::loncommon::end_page();
319: my $dest = '/adm/roles';
320: my %form = &get_form_items($r);
321: if ($form{'logtoken'}) {
322: my $tmpinfo = &Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
323: $form{'serverid'});
324: unless (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
325: ($tmpinfo eq 'no_such_host')) {
326: my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
327: $firsturl = &unescape($firsturl);
328: my %info;
329: foreach my $item (@rest) {
330: my ($key,$value) = split(/=/,$item);
331: $info{$key} = &unescape($value);
332: }
333: if ($firsturl ne '') {
334: $info{'firsturl'} = $firsturl;
335: $dest = $firsturl;
336: }
337: }
338: }
339: $r->print(
340: $start_page
341: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
342: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
343: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
344: .'</p>'
345: .$end_page
346: );
347: return OK;
348: }
349: }
350:
351: # ---------------------------------------------------- No valid token, continue
352:
353: my %form = &get_form_items($r);
354: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
355: &failed($r,'Username, password and domain need to be specified.',
356: \%form);
357: return OK;
358: }
359:
360: # split user logging in and "su"-user
361:
362: ($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
363: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
364: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
365: $form{'udom'} = &LONCAPA::clean_domain($form{'udom'});
366: $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
367:
368: my $role = $r->dir_config('lonRole');
369: my $domain = $r->dir_config('lonDefDomain');
370: my $prodir = $r->dir_config('lonUsersDir');
371: my $contact_name = &mt('LON-CAPA helpdesk');
372:
373: # ---------------------------------------- Get the information from login token
374:
375: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
376: $form{'serverid'});
377:
378: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
379: ($tmpinfo eq 'no_such_host')) {
380: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
381: return OK;
382: } else {
383: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
384: $form{'serverid'});
385: if ( $reply ne 'ok' ) {
386: &failed($r,'Session could not be opened.',\%form);
387: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
388: return OK;
389: }
390: }
391:
392: if (!&Apache::lonnet::domain($form{'udom'})) {
393: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
394: return OK;
395: }
396:
397: my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
398: $firsturl = &unescape($firsturl);
399: foreach my $item (@rest) {
400: my ($key,$value) = split(/=/,$item);
401: $form{$key} = &unescape($value);
402: }
403: my $upass = &Apache::loncommon::des_decrypt($des_key,$form{'upass0'});
404:
405: # ---------------------------------------------------------------- Authenticate
406:
407: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
408: my ($cancreate,$statustocreate) =
409: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
410: my $defaultauth;
411: if (ref($cancreate) eq 'ARRAY') {
412: if (grep(/^login$/,@{$cancreate})) {
413: $defaultauth = 1;
414: }
415: }
416: my $clientcancheckhost = 1;
417: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
418: $form{'udom'},$defaultauth,
419: $clientcancheckhost);
420:
421: # --------------------------------------------------------------------- Failed?
422:
423: if ($authhost eq 'no_host') {
424: my $pwdverify;
425: if (&Apache::lonnet::homeserver($form{'uname'},$form{'udom'}) eq 'no_host') {
426: my %possunames = &alternate_unames_check($form{'uname'},$form{'udom'});
427: if (keys(%possunames) > 0) {
428: foreach my $rulematch (keys(%possunames)) {
429: my $possuname = $possunames{$rulematch};
430: if (($possuname ne '') && ($possuname =~ /^$match_username$/)) {
431: $authhost=Apache::lonnet::authenticate($possuname,$upass,
432: $form{'udom'},undef,
433: $clientcancheckhost);
434: if (($authhost eq 'no_host') || ($authhost eq 'no_account_on_host')) {
435: next;
436: } elsif (($authhost ne '') && (&Apache::lonnet::hostname($authhost) ne '')) {
437: $pwdverify = 1;
438: &Apache::lonnet::logthis("Authenticated user: $possuname was submitted as: $form{'uname'}");
439: $form{'uname'} = $possuname;
440: last;
441: }
442: }
443: }
444: }
445: }
446: unless ($pwdverify) {
447: &failed($r,'Username and/or password could not be authenticated.',
448: \%form);
449: return OK;
450: }
451: } elsif ($authhost eq 'no_account_on_host') {
452: if ($defaultauth) {
453: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
454: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
455: return OK;
456: }
457: my $start_page =
458: &Apache::loncommon::start_page('Create a user account in LON-CAPA',
459: '',{'no_inline_link' => 1,});
460: my $lonhost = $r->dir_config('lonHostID');
461: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
462: my $contacts =
463: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
464: $form{'udom'},$origmail);
465: my ($contact_email) = split(',',$contacts);
466: my $output =
467: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
468: $domdesc,'',$lonhost,
469: $contact_email,$contact_name,
470: undef,$statustocreate);
471: &Apache::loncommon::content_type($r,'text/html');
472: $r->send_http_header;
473: &Apache::createaccount::print_header($r,$start_page);
474: $r->print('<h3>'.&mt('Account creation').'</h3>'.
475: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
476: $output.&Apache::loncommon::end_page());
477: return OK;
478: } else {
479: &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);
480: return OK;
481: }
482: }
483:
484: if (($firsturl eq '') ||
485: ($firsturl=~/^\/adm\/(logout|remote)/)) {
486: $firsturl='/adm/roles';
487: }
488:
489: my ($hosthere,%sessiondata);
490: if ($form{'iptoken'}) {
491: %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
492: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
493: if (($sessiondata{'domain'} eq $form{'udom'}) &&
494: ($sessiondata{'username'} eq $form{'uname'})) {
495: $hosthere = 1;
496: }
497: }
498:
499: # --------------------------------- Are we attempting to login as somebody else?
500: if ($form{'suname'}) {
501: my ($suname,$sudom,$sudomref);
502: $suname = $form{'suname'};
503: $sudom = $form{'udom'};
504: if ($form{'sudom'}) {
505: unless ($sudom eq $form{'sudom'}) {
506: if (&Apache::lonnet::domain($form{'sudom'})) {
507: $sudomref = [$form{'sudom'}];
508: $sudom = $form{'sudom'};
509: }
510: }
511: }
512: # ------------ see if the original user has enough privileges to pull this stunt
513: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
514: # ---------------------------------------------------- see if the su-user exists
515: unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
516: # ------------------------------ see if the su-user is not too highly privileged
517: if (&Apache::lonnet::privileged($suname,$sudom)) {
518: &Apache::lonnet::logthis('Attempted switch user to privileged user');
519: } else {
520: my $noprivswitch;
521: #
522: # su-user's home server and user's home server must have one of:
523: # (a) same domain
524: # (b) same primary library server for the two domains
525: # (c) same "internet domain" for primary library server(s) for home servers' domains
526: #
527: my $suprim = &Apache::lonnet::domain($sudom,'primary');
528: my $suintdom = &Apache::lonnet::internet_dom($suprim);
529: unless ($sudom eq $form{'udom'}) {
530: my $uprim = &Apache::lonnet::domain($form{'udom'},'primary');
531: my $uintdom = &Apache::lonnet::internet_dom($uprim);
532: unless ($suprim eq $uprim) {
533: unless ($suintdom eq $uintdom) {
534: &Apache::lonnet::logthis('Attempted switch user '
535: .'to user with different "internet domain".');
536: $noprivswitch = 1;
537: }
538: }
539: }
540:
541: unless ($noprivswitch) {
542: #
543: # server where log-in occurs must have same "internet domain" as su-user's home
544: # server
545: #
546: my $lonhost = $r->dir_config('lonHostID');
547: my $hostintdom = &Apache::lonnet::internet_dom($lonhost);
548: if ($hostintdom ne $suintdom) {
549: &Apache::lonnet::logthis('Attempted switch user on a '
550: .'server with a different "internet domain".');
551: } else {
552:
553: # -------------------------------------------------------- actually switch users
554:
555: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.
556: $form{'udom'}.' logging in as '.$suname.':'.$sudom);
557: $form{'uname'}=$suname;
558: if ($form{'udom'} ne $sudom) {
559: $form{'udom'}=$sudom;
560: }
561: }
562: }
563: }
564: }
565: } else {
566: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
567: }
568: }
569:
570: my ($is_balancer,$otherserver);
571:
572: unless ($hosthere) {
573: ($is_balancer,$otherserver) =
574: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
575: if ($is_balancer) {
576: # Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
577: my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
578: if (($found_server) && ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
579: $otherserver = $found_server;
580: }
581: if ($otherserver eq '') {
582: my $lowest_load;
583: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
584: if ($lowest_load > 100) {
585: $otherserver = &Apache::lonnet::spareserver($r,$lowest_load,$lowest_load,1,$form{'udom'});
586: }
587: }
588: if ($otherserver ne '') {
589: my @hosts = &Apache::lonnet::current_machine_ids();
590: if (grep(/^\Q$otherserver\E$/,@hosts)) {
591: $hosthere = $otherserver;
592: }
593: }
594: }
595: }
596:
597: if (($is_balancer) && (!$hosthere)) {
598: if ($otherserver) {
599: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
600: \%form);
601: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
602: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
603: $switchto .= '&origurl='.$firsturl;
604: }
605: if ($form{'role'}) {
606: $switchto .= '&role='.$form{'role'};
607: }
608: if ($form{'symb'}) {
609: $switchto .= '&symb='.$form{'symb'};
610: }
611: $r->internal_redirect($switchto);
612: } else {
613: &Apache::loncommon::content_type($r,'text/html');
614: $r->send_http_header;
615: $r->print(&noswitch());
616: }
617: return OK;
618: } else {
619: if (!&check_can_host($r,\%form,$authhost)) {
620: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
621: if ($otherserver) {
622: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
623: \%form);
624: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
625: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
626: $switchto .= '&origurl='.$firsturl;
627: }
628: if ($form{'role'}) {
629: $switchto .= '&role='.$form{'role'};
630: }
631: if ($form{'symb'}) {
632: $switchto .= '&symb='.$form{'symb'};
633: }
634: $r->internal_redirect($switchto);
635: } else {
636: &Apache::loncommon::content_type($r,'text/html');
637: $r->send_http_header;
638: $r->print(&noswitch());
639: }
640: return OK;
641: }
642:
643: # ------------------------------------------------------- Do the load balancing
644:
645: # ---------------------------------------------------------- Determine own load
646: my $loadlim = $r->dir_config('lonLoadLim');
647: my $loadavg;
648: {
649: my $loadfile=Apache::File->new('/proc/loadavg');
650: $loadavg=<$loadfile>;
651: }
652: $loadavg =~ s/\s.*//g;
653: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
654: my $userloadpercent=&Apache::lonnet::userload();
655:
656: # ---------------------------------------------------------- Are we overloaded?
657: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
658: my $unloaded=Apache::lonnet::spareserver($r,$loadpercent,$userloadpercent,1,$form{'udom'});
659: if (!$unloaded) {
660: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
661: }
662: if ($unloaded) {
663: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
664: undef,\%form);
665: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
666: return OK;
667: }
668: }
669: if (($is_balancer) && ($hosthere)) {
670: $form{'noloadbalance'} = $hosthere;
671: }
672: my $extra_env;
673: if (($hosthere) && ($sessiondata{'sessionserver'} ne '')) {
674: if ($sessiondata{'origurl'} ne '') {
675: $firsturl = $sessiondata{'origurl'};
676: $form{'firsturl'} = $sessiondata{'origurl'};
677: my @names = ('role','symb','linkprot','linkkey');
678: foreach my $item (@names) {
679: if ($sessiondata{$item} ne '') {
680: $form{$item} = $sessiondata{$item};
681: }
682: }
683: }
684: }
685: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
686: \%form);
687: return OK;
688: }
689: }
690:
691: sub get_form_items {
692: my ($r) = @_;
693: my $buffer;
694: if ($r->header_in('Content-length') > 0) {
695: $r->read($buffer,$r->header_in('Content-length'),0);
696: }
697: my %form;
698: foreach my $pair (split(/&/,$buffer)) {
699: my ($name,$value) = split(/=/,$pair);
700: $value =~ tr/+/ /;
701: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
702: $form{$name}=$value;
703: }
704: return %form;
705: }
706:
707: sub set_retry_token {
708: my ($form,$lonhost,$querystr) = @_;
709: if (ref($form) eq 'HASH') {
710: my ($firsturl,$token,$extras,@names);
711: @names = ('role','symb','iptoken');
712: foreach my $name (@names) {
713: if ($form->{$name} ne '') {
714: $extras .= '&'.$name.'='.&escape($form->{$name});
715: last if ($name eq 'linkprot');
716: }
717: }
718: my $firsturl = $form->{'firsturl'};
719: if (($firsturl ne '') || ($extras ne '')) {
720: $extras .= ':retry';
721: $token = &Apache::lonnet::reply('tmpput:'.&escape($firsturl).
722: $extras,$lonhost);
723: if (($token eq 'con_lost') || ($token eq 'no_such_host')) {
724: return 'fail';
725: } else {
726: if (ref($querystr)) {
727: $$querystr = 'retry='.$token;
728: }
729: return 'ok';
730: }
731: }
732: }
733: return;
734: }
735:
736: sub check_can_host {
737: my ($r,$form,$authhost,$domdesc) = @_;
738: return unless (ref($form) eq 'HASH');
739: my $canhost = 1;
740: my $lonhost = $r->dir_config('lonHostID');
741: my $udom = $form->{'udom'};
742: my @intdoms;
743: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
744: if (ref($internet_names) eq 'ARRAY') {
745: @intdoms = @{$internet_names};
746: }
747: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
748: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
749: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
750: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
751: my $hostname = &Apache::lonnet::hostname($lonhost);
752: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
753: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
754: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
755: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
756: my $loncaparev;
757: if ($authhost eq 'no_account_on_host') {
758: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
759: } else {
760: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
761: }
762: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
763: $udomdefaults{'remotesessions'},
764: $defdomdefaults{'hostedsessions'});
765: }
766: unless ($canhost) {
767: if ($authhost eq 'no_account_on_host') {
768: my $checkloginvia = 1;
769: my ($login_host,$hostname) =
770: &Apache::lonnet::choose_server($udom,$checkloginvia);
771: &Apache::loncommon::content_type($r,'text/html');
772: $r->send_http_header;
773: if ($login_host ne '') {
774: my $protocol = $Apache::lonnet::protocol{$login_host};
775: $protocol = 'http' if ($protocol ne 'https');
776: my $alias = &Apache::lonnet::use_proxy_alias($r,$login_host);
777: $hostname = $alias if ($alias ne '');
778: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
779: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
780: '<h3>'.&mt('Account creation').'</h3>'.
781: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
782: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
783: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
784: &Apache::loncommon::end_page());
785: } else {
786: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
787: '<h3>'.&mt('Account creation unavailable').'</h3>'.
788: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
789: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
790: &Apache::loncommon::end_page());
791: }
792: } else {
793: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
794: $form);
795: my ($otherserver) = &Apache::lonnet::choose_server($udom);
796: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
797: }
798: }
799: return $canhost;
800: }
801:
802: sub noswitch {
803: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
804: '<h3>'.&mt('Session unavailable').'</h3>'.
805: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
806: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
807: &Apache::loncommon::end_page();
808: return $result;
809: }
810:
811: sub loginhelpdisplay {
812: my ($authdomain) = @_;
813: my $login_help = 1;
814: my $lang = &Apache::lonlocal::current_language();
815: if ($login_help) {
816: my $dom = $authdomain;
817: if ($dom eq '') {
818: $dom = &Apache::lonnet::default_login_domain();
819: }
820: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
821: my $loginhelp_url;
822: if ($lang) {
823: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
824: if ($loginhelp_url ne '') {
825: return $loginhelp_url;
826: }
827: }
828: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
829: if ($loginhelp_url ne '') {
830: return $loginhelp_url;
831: } else {
832: return '/adm/loginproblems.html';
833: }
834: }
835: return;
836: }
837:
838: sub alternate_unames_check {
839: my ($uname,$udom) = @_;
840: my %possunames;
841: my %domdefs = &Apache::lonnet::get_domain_defaults($udom);
842: if (ref($domdefs{'unamemap_rule'}) eq 'ARRAY') {
843: if (@{$domdefs{'unamemap_rule'}} > 0) {
844: %possunames =
845: &Apache::lonnet::inst_rulecheck($udom,$uname,undef,
846: 'unamemap',$domdefs{'unamemap_rule'});
847: }
848: }
849: return %possunames;
850: }
851:
852: 1;
853: __END__
854:
855:
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