1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.152 2018/05/08 15:44:11 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 Apache::ltiauth;
40: use Fcntl qw(:flock);
41: use Apache::lonlocal;
42: use Apache::File();
43: use HTML::Entities;
44: use Digest::MD5;
45:
46: # ------------------------------------------------------------ Successful login
47: sub success {
48: my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
49: $form,$skipcritical) = @_;
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 $ENV{'REMOTE_ADDR'}");
65:
66: # ------------------------------------------------- Check for critical messages
67:
68: unless ($skipcritical) {
69: my @what=&Apache::lonnet::dump('critical',$domain,$username);
70: if ($what[0]) {
71: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
72: $lowerurl='/adm/email?critical=display';
73: }
74: }
75: }
76:
77: # ----------------------------------------------------------- Get cookies ready
78: my ($securecookie,$defaultcookie);
79: if ($ENV{'SERVER_PORT'} == 443) {
80: $securecookie="lonID=$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' => "$lonidsdir/$linkname.id"});
92: }
93: }
94: } else {
95: $defaultcookie = "lonID=$cookie; path=/; HttpOnly;";
96: }
97: # -------------------------------------------------------- Menu script and info
98: my $destination = $lowerurl;
99: if ($env{'request.lti.login'}) {
100: if (($env{'request.lti.reqcrs'}) && ($env{'request.lti.reqrole'} eq 'cc')) {
101: &Apache::loncommon::content_type($r,'text/html');
102: if ($securecookie) {
103: $r->headers_out->add('Set-cookie' => $securecookie);
104: }
105: if ($defaultcookie) {
106: $r->headers_out->add('Set-cookie' => $defaultcookie);
107: }
108: $r->send_http_header;
109: if (ref($form) eq 'HASH') {
110: $form->{'lti.reqcrs'} = $env{'request.lti.reqcrs'};
111: $form->{'lti.reqrole'} = $env{'request.lti.reqrole'};
112: $form->{'lti.sourcecrs'} = $env{'request.lti.sourcecrs'};
113: }
114: &Apache::ltiauth::lti_reqcrs($r,$domain,$form,$username,$domain);
115: return;
116: }
117: if ($env{'request.lti.selfenrollrole'}) {
118: if (&Apache::ltiauth::lti_enroll($username,$domain,
119: $env{'request.lti.selfenrollrole'}) eq 'ok') {
120: $form->{'role'} = $env{'request.lti.selfenrollrole'};
121: &Apache::lonnet::delenv('request.lti.selfenrollrole');
122: } else {
123: &Apache::ltiauth::invalid_request($r,24);
124: }
125: }
126: }
127: if (defined($form->{role})) {
128: my $envkey = 'user.role.'.$form->{role};
129: my $now=time;
130: my $then=$env{'user.login.time'};
131: my $refresh=$env{'user.refresh.time'};
132: my $update=$env{'user.update.time'};
133: if (!$update) {
134: $update = $then;
135: }
136: if (exists($env{$envkey})) {
137: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
138: &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
139: \$trolecode,\$tstatus,\$tstart,\$tend);
140: if ($tstatus eq 'is') {
141: $destination .= ($destination =~ /\?/) ? '&' : '?';
142: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
143: $destination .= 'selectrole=1&'.$newrole.'=1';
144: }
145: }
146: }
147: if (defined($form->{symb})) {
148: my $destsymb = $form->{symb};
149: $destination .= ($destination =~ /\?/) ? '&' : '?';
150: if ($destsymb =~ /___/) {
151: # FIXME Need to deal with encrypted symbs and urls as needed.
152: my ($map,$resid,$desturl)=split(/___/,$destsymb);
153: $desturl = &Apache::lonnet::clutter($desturl);
154: $desturl = &HTML::Entities::encode($desturl,'"<>&');
155: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
156: $destination .= 'destinationurl='.$desturl.
157: '&destsymb='.$destsymb;
158: } else {
159: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
160: $destination .= 'destinationurl='.$destsymb;
161: }
162: }
163: if ($destination =~ m{^/adm/roles}) {
164: $destination .= ($destination =~ /\?/) ? '&' : '?';
165: $destination .= 'source=login';
166: }
167:
168: my $windowname = 'loncapaclient';
169: if ($env{'request.lti.login'}) {
170: $windowname .= 'lti';
171: }
172: my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="'.$windowname.'";');
173: my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
174: my $brcrum = [{'href' => '',
175: 'text' => 'Successful Login'},];
176: my $args = {'bread_crumbs' => $brcrum,};
177: unless ((defined($form->{role})) || (defined($form->{symb}))) {
178: my $update=$env{'user.update.time'};
179: if (!$update) {
180: $update = $env{'user.login.time'};
181: }
182: my %roles_in_env;
183: my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
184: if ($showcount == 1) {
185: foreach my $rolecode (keys(%roles_in_env)) {
186: my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
187: if ($cid) {
188: my %coursedescription =
189: &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
190: if ($coursedescription{'type'} eq 'Placement') {
191: $args->{'crstype'} = 'Placement';
192: }
193: last;
194: }
195: }
196: }
197: }
198:
199: # ------------------------------------------------- Output for successful login
200:
201: &Apache::loncommon::content_type($r,'text/html');
202: if ($securecookie) {
203: $r->headers_out->add('Set-cookie' => $securecookie);
204: }
205: if ($defaultcookie) {
206: $r->headers_out->add('Set-cookie' => $defaultcookie);
207: }
208: $r->send_http_header;
209:
210: my $start_page;
211: if ($env{'request.lti.login'}) {
212: $args = {'only_body' => 1,};
213: $start_page=&Apache::loncommon::start_page('',$header,$args);
214: } else {
215: $start_page=&Apache::loncommon::start_page('Successful Login',
216: $header,$args);
217: }
218: my $end_page =&Apache::loncommon::end_page();
219:
220: my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
221:
222: my $pagebody;
223: unless ($env{'request.lti.login'}) {
224: my %lt=&Apache::lonlocal::texthash(
225: 'wel' => 'Welcome',
226: 'pro' => 'Login problems?',
227: );
228: $pagebody = "<h1>$lt{'wel'}</h1>\n".
229: &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
230: my $loginhelp = &loginhelpdisplay($domain);
231: if ($loginhelp) {
232: $pagebody .= '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
233: }
234: }
235: $r->print(<<ENDSUCCESS);
236: $start_page
237: $windowinfo
238: $pagebody
239: $continuelink
240: $end_page
241: ENDSUCCESS
242: return;
243: }
244:
245: # --------------------------------------------------------------- Failed login!
246:
247: sub failed {
248: my ($r,$message,$form) = @_;
249: (undef,undef,undef,my $clientmathml,my $clientunicode) =
250: &Apache::loncommon::decode_user_agent();
251: my $args = {};
252: if ($clientunicode && !$clientmathml) {
253: $args = {'browser.unicode' => 1};
254: }
255:
256: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
257: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
258: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
259: if (&Apache::lonnet::domain($udom,'description') eq '') {
260: undef($udom);
261: }
262: my $retry = '/adm/login';
263: if ($uname eq $form->{'uname'}) {
264: $retry .= '?username='.$uname;
265: }
266: if ($udom) {
267: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
268: }
269: if (exists($form->{role})) {
270: my $role = &Apache::loncommon::cleanup_html($form->{role});
271: if ($role ne '') {
272: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
273: }
274: }
275: if (exists($form->{symb})) {
276: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
277: if ($symb ne '') {
278: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
279: }
280: }
281: my $end_page = &Apache::loncommon::end_page();
282: &Apache::loncommon::content_type($r,'text/html');
283: $r->send_http_header;
284: my @actions =
285: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
286: my $loginhelp = &loginhelpdisplay($udom);
287: if ($loginhelp) {
288: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
289: }
290: #FIXME: link to helpdesk might be added here
291:
292: $r->print(
293: $start_page
294: .'<h2>'.&mt('Sorry ...').'</h2>'
295: .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
296: .&Apache::lonhtmlcommon::actionbox(\@actions)
297: .$end_page
298: );
299: }
300:
301: # ------------------------------------------------------------------ Rerouting!
302:
303: sub reroute {
304: my ($r) = @_;
305: &Apache::loncommon::content_type($r,'text/html');
306: $r->send_http_header;
307: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
308: .&mt('Please [_1]log in again[_2].');
309: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
310: }
311:
312: # ---------------------------------------------------------------- Main handler
313:
314: sub handler {
315: my $r = shift;
316: my $londocroot = $r->dir_config('lonDocRoot');
317: # Are we re-routing?
318: if (-e "$londocroot/lon-status/reroute.txt") {
319: &reroute($r);
320: return OK;
321: }
322:
323: &Apache::lonlocal::get_language_handle($r);
324:
325: # -------------------------------- Prevent users from attempting to login twice
326: my $handle = &Apache::lonnet::check_for_valid_session($r);
327: if ($handle ne '') {
328: my $lonidsdir=$r->dir_config('lonIDsDir');
329: if ($handle=~/^publicuser\_/) {
330: # For "public user" - remove it, we apparently really want to login
331: unlink($r->dir_config('lonIDsDir')."/$handle.id");
332: } else {
333: # Indeed, a valid token is found
334: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
335: &Apache::loncommon::content_type($r,'text/html');
336: $r->send_http_header;
337: my $start_page =
338: &Apache::loncommon::start_page('Already logged in');
339: my $end_page =
340: &Apache::loncommon::end_page();
341: my $dest = '/adm/roles';
342: if ($env{'form.firsturl'} ne '') {
343: $dest = $env{'form.firsturl'};
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:
360: my $buffer;
361: if ($r->header_in('Content-length') > 0) {
362: $r->read($buffer,$r->header_in('Content-length'),0);
363: }
364: my %form;
365: foreach my $pair (split(/&/,$buffer)) {
366: my ($name,$value) = split(/=/,$pair);
367: $value =~ tr/+/ /;
368: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
369: $form{$name}=$value;
370: }
371:
372: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
373: &failed($r,'Username, password and domain need to be specified.',
374: \%form);
375: return OK;
376: }
377:
378: # split user logging in and "su"-user
379:
380: ($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
381: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
382: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
383: $form{'udom'} = &LONCAPA::clean_domain($form{'udom'});
384: $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
385:
386: my $role = $r->dir_config('lonRole');
387: my $domain = $r->dir_config('lonDefDomain');
388: my $prodir = $r->dir_config('lonUsersDir');
389: my $contact_name = &mt('LON-CAPA helpdesk');
390:
391: # ---------------------------------------- Get the information from login token
392:
393: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
394: $form{'serverid'});
395:
396: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
397: ($tmpinfo eq 'no_such_host')) {
398: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
399: return OK;
400: } else {
401: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
402: $form{'serverid'});
403: if ( $reply ne 'ok' ) {
404: &failed($r,'Session could not be opened.',\%form);
405: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
406: return OK;
407: }
408: }
409:
410: if (!&Apache::lonnet::domain($form{'udom'})) {
411: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
412: return OK;
413: }
414:
415: my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
416: if ($rolestr) {
417: $rolestr = &unescape($rolestr);
418: }
419: if ($symbstr) {
420: $symbstr= &unescape($symbstr);
421: }
422: if ($iptokenstr) {
423: $iptokenstr = &unescape($iptokenstr);
424: }
425: if ($rolestr =~ /^role=/) {
426: (undef,$form{'role'}) = split('=',$rolestr);
427: }
428: if ($symbstr =~ /^symb=/) {
429: (undef,$form{'symb'}) = split('=',$symbstr);
430: }
431: if ($iptokenstr =~ /^iptoken=/) {
432: (undef,$form{'iptoken'}) = split('=',$iptokenstr);
433: }
434:
435: my $upass = $ENV{HTTPS} ? $form{'upass0'}
436: : &Apache::loncommon::des_decrypt($key,$form{'upass0'});
437:
438: # ---------------------------------------------------------------- Authenticate
439:
440: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
441: my ($cancreate,$statustocreate) =
442: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
443: my $defaultauth;
444: if (ref($cancreate) eq 'ARRAY') {
445: if (grep(/^login$/,@{$cancreate})) {
446: $defaultauth = 1;
447: }
448: }
449: my $clientcancheckhost = 1;
450: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
451: $form{'udom'},$defaultauth,
452: $clientcancheckhost);
453:
454: # --------------------------------------------------------------------- Failed?
455:
456: if ($authhost eq 'no_host') {
457: &failed($r,'Username and/or password could not be authenticated.',
458: \%form);
459: return OK;
460: } elsif ($authhost eq 'no_account_on_host') {
461: if ($defaultauth) {
462: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
463: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
464: return OK;
465: }
466: my $start_page =
467: &Apache::loncommon::start_page('Create a user account in LON-CAPA');
468: my $lonhost = $r->dir_config('lonHostID');
469: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
470: my $contacts =
471: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
472: $form{'udom'},$origmail);
473: my ($contact_email) = split(',',$contacts);
474: my $output =
475: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
476: $domdesc,'',$lonhost,
477: $contact_email,$contact_name,
478: undef,$statustocreate);
479: &Apache::loncommon::content_type($r,'text/html');
480: $r->send_http_header;
481: &Apache::createaccount::print_header($r,$start_page);
482: $r->print('<h3>'.&mt('Account creation').'</h3>'.
483: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
484: $output.&Apache::loncommon::end_page());
485: return OK;
486: } else {
487: &failed($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);
488: return OK;
489: }
490: }
491:
492: if (($firsturl eq '') ||
493: ($firsturl=~/^\/adm\/(logout|remote)/)) {
494: $firsturl='/adm/roles';
495: }
496:
497: my $hosthere;
498: if ($form{'iptoken'}) {
499: my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
500: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
501: if (($sessiondata{'domain'} eq $form{'udom'}) &&
502: ($sessiondata{'username'} eq $form{'uname'})) {
503: $hosthere = 1;
504: }
505: }
506:
507: # --------------------------------- Are we attempting to login as somebody else?
508: if ($form{'suname'}) {
509: my ($suname,$sudom,$sudomref);
510: $suname = $form{'suname'};
511: $sudom = $form{'udom'};
512: if ($form{'sudom'}) {
513: unless ($sudom eq $form{'sudom'}) {
514: if (&Apache::lonnet::domain($form{'sudom'})) {
515: $sudomref = [$form{'sudom'}];
516: $sudom = $form{'sudom'};
517: }
518: }
519: }
520: # ------------ see if the original user has enough privileges to pull this stunt
521: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
522: # ---------------------------------------------------- see if the su-user exists
523: unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
524: # ------------------------------ see if the su-user is not too highly privileged
525: if (&Apache::lonnet::privileged($suname,$sudom)) {
526: &Apache::lonnet::logthis('Attempted switch user to privileged user');
527: } else {
528: my $noprivswitch;
529: #
530: # su-user's home server and user's home server must have one of:
531: # (a) same domain
532: # (b) same primary library server for the two domains
533: # (c) same "internet domain" for primary library server(s) for home servers' domains
534: #
535: my $suprim = &Apache::lonnet::domain($sudom,'primary');
536: my $suintdom = &Apache::lonnet::internet_dom($suprim);
537: unless ($sudom eq $form{'udom'}) {
538: my $uprim = &Apache::lonnet::domain($form{'udom'},'primary');
539: my $uintdom = &Apache::lonnet::internet_dom($uprim);
540: unless ($suprim eq $uprim) {
541: unless ($suintdom eq $uintdom) {
542: &Apache::lonnet::logthis('Attempted switch user '
543: .'to user with different "internet domain".');
544: $noprivswitch = 1;
545: }
546: }
547: }
548:
549: unless ($noprivswitch) {
550: #
551: # server where log-in occurs must have same "internet domain" as su-user's home
552: # server
553: #
554: my $lonhost = $r->dir_config('lonHostID');
555: my $hostintdom = &Apache::lonnet::internet_dom($lonhost);
556: if ($hostintdom ne $suintdom) {
557: &Apache::lonnet::logthis('Attempted switch user on a '
558: .'server with a different "internet domain".');
559: } else {
560:
561: # -------------------------------------------------------- actually switch users
562:
563: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.
564: $form{'udom'}.' logging in as '.$suname.':'.$sudom);
565: $form{'uname'}=$suname;
566: if ($form{'udom'} ne $sudom) {
567: $form{'udom'}=$sudom;
568: }
569: }
570: }
571: }
572: }
573: } else {
574: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
575: }
576: }
577:
578: my ($is_balancer,$otherserver);
579:
580: unless ($hosthere) {
581: ($is_balancer,$otherserver) =
582: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
583: if ($is_balancer) {
584: if ($otherserver eq '') {
585: my $lowest_load;
586: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
587: if ($lowest_load > 100) {
588: $otherserver = &Apache::lonnet::spareserver($lowest_load,$lowest_load,1,$form{'udom'});
589: }
590: }
591: if ($otherserver ne '') {
592: my @hosts = &Apache::lonnet::current_machine_ids();
593: if (grep(/^\Q$otherserver\E$/,@hosts)) {
594: $hosthere = $otherserver;
595: }
596: }
597: }
598: }
599:
600: if (($is_balancer) && (!$hosthere)) {
601: if ($otherserver) {
602: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
603: \%form);
604: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
605: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
606: $switchto .= '&origurl='.$firsturl;
607: }
608: if ($form{'role'}) {
609: $switchto .= '&role='.$form{'role'};
610: }
611: if ($form{'symb'}) {
612: $switchto .= '&symb='.$form{'symb'};
613: }
614: $r->internal_redirect($switchto);
615: } else {
616: $r->print(&noswitch());
617: }
618: return OK;
619: } else {
620: if (!&check_can_host($r,\%form,$authhost)) {
621: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
622: if ($otherserver) {
623: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
624: \%form);
625: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
626: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
627: $switchto .= '&origurl='.$firsturl;
628: }
629: if ($form{'role'}) {
630: $switchto .= '&role='.$form{'role'};
631: }
632: if ($form{'symb'}) {
633: $switchto .= '&symb='.$form{'symb'};
634: }
635: $r->internal_redirect($switchto);
636: } else {
637: $r->print(&noswitch());
638: }
639: return OK;
640: }
641:
642: # ------------------------------------------------------- Do the load balancing
643:
644: # ---------------------------------------------------------- Determine own load
645: my $loadlim = $r->dir_config('lonLoadLim');
646: my $loadavg;
647: {
648: my $loadfile=Apache::File->new('/proc/loadavg');
649: $loadavg=<$loadfile>;
650: }
651: $loadavg =~ s/\s.*//g;
652: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
653: my $userloadpercent=&Apache::lonnet::userload();
654:
655: # ---------------------------------------------------------- Are we overloaded?
656: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
657: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
658: if (!$unloaded) {
659: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
660: }
661: if ($unloaded) {
662: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
663: undef,\%form);
664: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
665: return OK;
666: }
667: }
668: if (($is_balancer) && ($hosthere)) {
669: $form{'noloadbalance'} = $hosthere;
670: }
671: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
672: \%form);
673: return OK;
674: }
675: }
676:
677: sub check_can_host {
678: my ($r,$form,$authhost,$domdesc) = @_;
679: return unless (ref($form) eq 'HASH');
680: my $canhost = 1;
681: my $lonhost = $r->dir_config('lonHostID');
682: my $udom = $form->{'udom'};
683: my @intdoms;
684: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
685: if (ref($internet_names) eq 'ARRAY') {
686: @intdoms = @{$internet_names};
687: }
688: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
689: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
690: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
691: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
692: my $hostname = &Apache::lonnet::hostname($lonhost);
693: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
694: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
695: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
696: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
697: my $loncaparev;
698: if ($authhost eq 'no_account_on_host') {
699: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
700: } else {
701: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
702: }
703: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
704: $udomdefaults{'remotesessions'},
705: $defdomdefaults{'hostedsessions'});
706: }
707: unless ($canhost) {
708: if ($authhost eq 'no_account_on_host') {
709: my $checkloginvia = 1;
710: my ($login_host,$hostname) =
711: &Apache::lonnet::choose_server($udom,$checkloginvia);
712: &Apache::loncommon::content_type($r,'text/html');
713: $r->send_http_header;
714: if ($login_host ne '') {
715: my $protocol = $Apache::lonnet::protocol{$login_host};
716: $protocol = 'http' if ($protocol ne 'https');
717: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
718: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
719: '<h3>'.&mt('Account creation').'</h3>'.
720: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
721: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
722: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
723: &Apache::loncommon::end_page());
724: } else {
725: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
726: '<h3>'.&mt('Account creation unavailable').'</h3>'.
727: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
728: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
729: &Apache::loncommon::end_page());
730: }
731: } else {
732: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
733: $form);
734: my ($otherserver) = &Apache::lonnet::choose_server($udom);
735: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
736: }
737: }
738: return $canhost;
739: }
740:
741: sub noswitch {
742: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
743: '<h3>'.&mt('Session unavailable').'</h3>'.
744: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
745: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
746: &Apache::loncommon::end_page();
747: return $result;
748: }
749:
750: sub loginhelpdisplay {
751: my ($authdomain) = @_;
752: my $login_help = 1;
753: my $lang = &Apache::lonlocal::current_language();
754: if ($login_help) {
755: my $dom = $authdomain;
756: if ($dom eq '') {
757: $dom = &Apache::lonnet::default_login_domain();
758: }
759: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
760: my $loginhelp_url;
761: if ($lang) {
762: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
763: if ($loginhelp_url ne '') {
764: return $loginhelp_url;
765: }
766: }
767: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
768: if ($loginhelp_url ne '') {
769: return $loginhelp_url;
770: } else {
771: return '/adm/loginproblems.html';
772: }
773: }
774: return;
775: }
776:
777: 1;
778: __END__
779:
780:
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