1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.151 2018/04/21 21:29:31 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: $r->send_http_header;
109: &Apache::ltiauth::lti_reqcrs($r,$domain,$form,$username,$domain);
110: return;
111: }
112: if ($env{'request.lti.selfenrollrole'}) {
113: if (&Apache::ltiauth::lti_enroll($username,$domain,
114: $env{'request.lti.selfenrollrole'}) eq 'ok') {
115: $form->{'role'} = $env{'request.lti.selfenrollrole'};
116: &Apache::lonnet::delenv('request.lti.selfenrollrole');
117: } else {
118: &Apache::ltiauth::invalid_request($r,24);
119: }
120: }
121: }
122: if (defined($form->{role})) {
123: my $envkey = 'user.role.'.$form->{role};
124: my $now=time;
125: my $then=$env{'user.login.time'};
126: my $refresh=$env{'user.refresh.time'};
127: my $update=$env{'user.update.time'};
128: if (!$update) {
129: $update = $then;
130: }
131: if (exists($env{$envkey})) {
132: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
133: &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
134: \$trolecode,\$tstatus,\$tstart,\$tend);
135: if ($tstatus eq 'is') {
136: $destination .= ($destination =~ /\?/) ? '&' : '?';
137: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
138: $destination .= 'selectrole=1&'.$newrole.'=1';
139: }
140: }
141: }
142: if (defined($form->{symb})) {
143: my $destsymb = $form->{symb};
144: $destination .= ($destination =~ /\?/) ? '&' : '?';
145: if ($destsymb =~ /___/) {
146: # FIXME Need to deal with encrypted symbs and urls as needed.
147: my ($map,$resid,$desturl)=split(/___/,$destsymb);
148: $desturl = &Apache::lonnet::clutter($desturl);
149: $desturl = &HTML::Entities::encode($desturl,'"<>&');
150: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
151: $destination .= 'destinationurl='.$desturl.
152: '&destsymb='.$destsymb;
153: } else {
154: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
155: $destination .= 'destinationurl='.$destsymb;
156: }
157: }
158: if ($destination =~ m{^/adm/roles}) {
159: $destination .= ($destination =~ /\?/) ? '&' : '?';
160: $destination .= 'source=login';
161: }
162:
163: my $windowname = 'loncapaclient';
164: if ($env{'request.lti.login'}) {
165: $windowname .= 'lti';
166: }
167: my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="'.$windowname.'";');
168: my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
169: my $brcrum = [{'href' => '',
170: 'text' => 'Successful Login'},];
171: my $args = {'bread_crumbs' => $brcrum,};
172: unless ((defined($form->{role})) || (defined($form->{symb}))) {
173: my $update=$env{'user.update.time'};
174: if (!$update) {
175: $update = $env{'user.login.time'};
176: }
177: my %roles_in_env;
178: my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
179: if ($showcount == 1) {
180: foreach my $rolecode (keys(%roles_in_env)) {
181: my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
182: if ($cid) {
183: my %coursedescription =
184: &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
185: if ($coursedescription{'type'} eq 'Placement') {
186: $args->{'crstype'} = 'Placement';
187: }
188: last;
189: }
190: }
191: }
192: }
193:
194: # ------------------------------------------------- Output for successful login
195:
196: &Apache::loncommon::content_type($r,'text/html');
197: if ($securecookie) {
198: $r->headers_out->add('Set-cookie' => $securecookie);
199: }
200: if ($defaultcookie) {
201: $r->headers_out->add('Set-cookie' => $defaultcookie);
202: }
203: $r->send_http_header;
204:
205: my $start_page;
206: if ($env{'request.lti.login'}) {
207: $args = {'only_body' => 1,};
208: $start_page=&Apache::loncommon::start_page('',$header,$args);
209: } else {
210: $start_page=&Apache::loncommon::start_page('Successful Login',
211: $header,$args);
212: }
213: my $end_page =&Apache::loncommon::end_page();
214:
215: my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
216:
217: my $pagebody;
218: unless ($env{'request.lti.login'}) {
219: my %lt=&Apache::lonlocal::texthash(
220: 'wel' => 'Welcome',
221: 'pro' => 'Login problems?',
222: );
223: $pagebody = "<h1>$lt{'wel'}</h1>\n".
224: &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
225: my $loginhelp = &loginhelpdisplay($domain);
226: if ($loginhelp) {
227: $pagebody .= '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
228: }
229: }
230: $r->print(<<ENDSUCCESS);
231: $start_page
232: $windowinfo
233: $pagebody
234: $continuelink
235: $end_page
236: ENDSUCCESS
237: return;
238: }
239:
240: # --------------------------------------------------------------- Failed login!
241:
242: sub failed {
243: my ($r,$message,$form) = @_;
244: (undef,undef,undef,my $clientmathml,my $clientunicode) =
245: &Apache::loncommon::decode_user_agent();
246: my $args = {};
247: if ($clientunicode && !$clientmathml) {
248: $args = {'browser.unicode' => 1};
249: }
250:
251: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
252: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
253: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
254: if (&Apache::lonnet::domain($udom,'description') eq '') {
255: undef($udom);
256: }
257: my $retry = '/adm/login';
258: if ($uname eq $form->{'uname'}) {
259: $retry .= '?username='.$uname;
260: }
261: if ($udom) {
262: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
263: }
264: if (exists($form->{role})) {
265: my $role = &Apache::loncommon::cleanup_html($form->{role});
266: if ($role ne '') {
267: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
268: }
269: }
270: if (exists($form->{symb})) {
271: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
272: if ($symb ne '') {
273: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
274: }
275: }
276: my $end_page = &Apache::loncommon::end_page();
277: &Apache::loncommon::content_type($r,'text/html');
278: $r->send_http_header;
279: my @actions =
280: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
281: my $loginhelp = &loginhelpdisplay($udom);
282: if ($loginhelp) {
283: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
284: }
285: #FIXME: link to helpdesk might be added here
286:
287: $r->print(
288: $start_page
289: .'<h2>'.&mt('Sorry ...').'</h2>'
290: .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
291: .&Apache::lonhtmlcommon::actionbox(\@actions)
292: .$end_page
293: );
294: }
295:
296: # ------------------------------------------------------------------ Rerouting!
297:
298: sub reroute {
299: my ($r) = @_;
300: &Apache::loncommon::content_type($r,'text/html');
301: $r->send_http_header;
302: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
303: .&mt('Please [_1]log in again[_2].');
304: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
305: }
306:
307: # ---------------------------------------------------------------- Main handler
308:
309: sub handler {
310: my $r = shift;
311: my $londocroot = $r->dir_config('lonDocRoot');
312: # Are we re-routing?
313: if (-e "$londocroot/lon-status/reroute.txt") {
314: &reroute($r);
315: return OK;
316: }
317:
318: &Apache::lonlocal::get_language_handle($r);
319:
320: # -------------------------------- Prevent users from attempting to login twice
321: my $handle = &Apache::lonnet::check_for_valid_session($r);
322: if ($handle ne '') {
323: my $lonidsdir=$r->dir_config('lonIDsDir');
324: if ($handle=~/^publicuser\_/) {
325: # For "public user" - remove it, we apparently really want to login
326: unlink($r->dir_config('lonIDsDir')."/$handle.id");
327: } else {
328: # Indeed, a valid token is found
329: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
330: &Apache::loncommon::content_type($r,'text/html');
331: $r->send_http_header;
332: my $start_page =
333: &Apache::loncommon::start_page('Already logged in');
334: my $end_page =
335: &Apache::loncommon::end_page();
336: my $dest = '/adm/roles';
337: if ($env{'form.firsturl'} ne '') {
338: $dest = $env{'form.firsturl'};
339: }
340: $r->print(
341: $start_page
342: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
343: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
344: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
345: .'</p>'
346: .$end_page
347: );
348: return OK;
349: }
350: }
351:
352: # ---------------------------------------------------- No valid token, continue
353:
354:
355: my $buffer;
356: if ($r->header_in('Content-length') > 0) {
357: $r->read($buffer,$r->header_in('Content-length'),0);
358: }
359: my %form;
360: foreach my $pair (split(/&/,$buffer)) {
361: my ($name,$value) = split(/=/,$pair);
362: $value =~ tr/+/ /;
363: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
364: $form{$name}=$value;
365: }
366:
367: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
368: &failed($r,'Username, password and domain need to be specified.',
369: \%form);
370: return OK;
371: }
372:
373: # split user logging in and "su"-user
374:
375: ($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
376: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
377: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
378: $form{'udom'} = &LONCAPA::clean_domain($form{'udom'});
379: $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
380:
381: my $role = $r->dir_config('lonRole');
382: my $domain = $r->dir_config('lonDefDomain');
383: my $prodir = $r->dir_config('lonUsersDir');
384: my $contact_name = &mt('LON-CAPA helpdesk');
385:
386: # ---------------------------------------- Get the information from login token
387:
388: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
389: $form{'serverid'});
390:
391: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
392: ($tmpinfo eq 'no_such_host')) {
393: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
394: return OK;
395: } else {
396: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
397: $form{'serverid'});
398: if ( $reply ne 'ok' ) {
399: &failed($r,'Session could not be opened.',\%form);
400: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
401: return OK;
402: }
403: }
404:
405: if (!&Apache::lonnet::domain($form{'udom'})) {
406: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
407: return OK;
408: }
409:
410: my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
411: if ($rolestr) {
412: $rolestr = &unescape($rolestr);
413: }
414: if ($symbstr) {
415: $symbstr= &unescape($symbstr);
416: }
417: if ($iptokenstr) {
418: $iptokenstr = &unescape($iptokenstr);
419: }
420: if ($rolestr =~ /^role=/) {
421: (undef,$form{'role'}) = split('=',$rolestr);
422: }
423: if ($symbstr =~ /^symb=/) {
424: (undef,$form{'symb'}) = split('=',$symbstr);
425: }
426: if ($iptokenstr =~ /^iptoken=/) {
427: (undef,$form{'iptoken'}) = split('=',$iptokenstr);
428: }
429:
430: my $upass = $ENV{HTTPS} ? $form{'upass0'}
431: : &Apache::loncommon::des_decrypt($key,$form{'upass0'});
432:
433: # ---------------------------------------------------------------- Authenticate
434:
435: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
436: my ($cancreate,$statustocreate) =
437: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
438: my $defaultauth;
439: if (ref($cancreate) eq 'ARRAY') {
440: if (grep(/^login$/,@{$cancreate})) {
441: $defaultauth = 1;
442: }
443: }
444: my $clientcancheckhost = 1;
445: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
446: $form{'udom'},$defaultauth,
447: $clientcancheckhost);
448:
449: # --------------------------------------------------------------------- Failed?
450:
451: if ($authhost eq 'no_host') {
452: &failed($r,'Username and/or password could not be authenticated.',
453: \%form);
454: return OK;
455: } elsif ($authhost eq 'no_account_on_host') {
456: if ($defaultauth) {
457: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
458: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
459: return OK;
460: }
461: my $start_page =
462: &Apache::loncommon::start_page('Create a user account in LON-CAPA');
463: my $lonhost = $r->dir_config('lonHostID');
464: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
465: my $contacts =
466: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
467: $form{'udom'},$origmail);
468: my ($contact_email) = split(',',$contacts);
469: my $output =
470: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
471: $domdesc,'',$lonhost,
472: $contact_email,$contact_name,
473: undef,$statustocreate);
474: &Apache::loncommon::content_type($r,'text/html');
475: $r->send_http_header;
476: &Apache::createaccount::print_header($r,$start_page);
477: $r->print('<h3>'.&mt('Account creation').'</h3>'.
478: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
479: $output.&Apache::loncommon::end_page());
480: return OK;
481: } else {
482: &failed($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);
483: return OK;
484: }
485: }
486:
487: if (($firsturl eq '') ||
488: ($firsturl=~/^\/adm\/(logout|remote)/)) {
489: $firsturl='/adm/roles';
490: }
491:
492: my $hosthere;
493: if ($form{'iptoken'}) {
494: my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
495: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
496: if (($sessiondata{'domain'} eq $form{'udom'}) &&
497: ($sessiondata{'username'} eq $form{'uname'})) {
498: $hosthere = 1;
499: }
500: }
501:
502: # --------------------------------- Are we attempting to login as somebody else?
503: if ($form{'suname'}) {
504: my ($suname,$sudom,$sudomref);
505: $suname = $form{'suname'};
506: $sudom = $form{'udom'};
507: if ($form{'sudom'}) {
508: unless ($sudom eq $form{'sudom'}) {
509: if (&Apache::lonnet::domain($form{'sudom'})) {
510: $sudomref = [$form{'sudom'}];
511: $sudom = $form{'sudom'};
512: }
513: }
514: }
515: # ------------ see if the original user has enough privileges to pull this stunt
516: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
517: # ---------------------------------------------------- see if the su-user exists
518: unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
519: # ------------------------------ see if the su-user is not too highly privileged
520: if (&Apache::lonnet::privileged($suname,$sudom)) {
521: &Apache::lonnet::logthis('Attempted switch user to privileged user');
522: } else {
523: my $noprivswitch;
524: #
525: # su-user's home server and user's home server must have one of:
526: # (a) same domain
527: # (b) same primary library server for the two domains
528: # (c) same "internet domain" for primary library server(s) for home servers' domains
529: #
530: my $suprim = &Apache::lonnet::domain($sudom,'primary');
531: my $suintdom = &Apache::lonnet::internet_dom($suprim);
532: unless ($sudom eq $form{'udom'}) {
533: my $uprim = &Apache::lonnet::domain($form{'udom'},'primary');
534: my $uintdom = &Apache::lonnet::internet_dom($uprim);
535: unless ($suprim eq $uprim) {
536: unless ($suintdom eq $uintdom) {
537: &Apache::lonnet::logthis('Attempted switch user '
538: .'to user with different "internet domain".');
539: $noprivswitch = 1;
540: }
541: }
542: }
543:
544: unless ($noprivswitch) {
545: #
546: # server where log-in occurs must have same "internet domain" as su-user's home
547: # server
548: #
549: my $lonhost = $r->dir_config('lonHostID');
550: my $hostintdom = &Apache::lonnet::internet_dom($lonhost);
551: if ($hostintdom ne $suintdom) {
552: &Apache::lonnet::logthis('Attempted switch user on a '
553: .'server with a different "internet domain".');
554: } else {
555:
556: # -------------------------------------------------------- actually switch users
557:
558: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.
559: $form{'udom'}.' logging in as '.$suname.':'.$sudom);
560: $form{'uname'}=$suname;
561: if ($form{'udom'} ne $sudom) {
562: $form{'udom'}=$sudom;
563: }
564: }
565: }
566: }
567: }
568: } else {
569: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
570: }
571: }
572:
573: my ($is_balancer,$otherserver);
574:
575: unless ($hosthere) {
576: ($is_balancer,$otherserver) =
577: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
578: if ($is_balancer) {
579: if ($otherserver eq '') {
580: my $lowest_load;
581: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
582: if ($lowest_load > 100) {
583: $otherserver = &Apache::lonnet::spareserver($lowest_load,$lowest_load,1,$form{'udom'});
584: }
585: }
586: if ($otherserver ne '') {
587: my @hosts = &Apache::lonnet::current_machine_ids();
588: if (grep(/^\Q$otherserver\E$/,@hosts)) {
589: $hosthere = $otherserver;
590: }
591: }
592: }
593: }
594:
595: if (($is_balancer) && (!$hosthere)) {
596: if ($otherserver) {
597: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
598: \%form);
599: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
600: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
601: $switchto .= '&origurl='.$firsturl;
602: }
603: if ($form{'role'}) {
604: $switchto .= '&role='.$form{'role'};
605: }
606: if ($form{'symb'}) {
607: $switchto .= '&symb='.$form{'symb'};
608: }
609: $r->internal_redirect($switchto);
610: } else {
611: $r->print(&noswitch());
612: }
613: return OK;
614: } else {
615: if (!&check_can_host($r,\%form,$authhost)) {
616: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
617: if ($otherserver) {
618: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
619: \%form);
620: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
621: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
622: $switchto .= '&origurl='.$firsturl;
623: }
624: if ($form{'role'}) {
625: $switchto .= '&role='.$form{'role'};
626: }
627: if ($form{'symb'}) {
628: $switchto .= '&symb='.$form{'symb'};
629: }
630: $r->internal_redirect($switchto);
631: } else {
632: $r->print(&noswitch());
633: }
634: return OK;
635: }
636:
637: # ------------------------------------------------------- Do the load balancing
638:
639: # ---------------------------------------------------------- Determine own load
640: my $loadlim = $r->dir_config('lonLoadLim');
641: my $loadavg;
642: {
643: my $loadfile=Apache::File->new('/proc/loadavg');
644: $loadavg=<$loadfile>;
645: }
646: $loadavg =~ s/\s.*//g;
647: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
648: my $userloadpercent=&Apache::lonnet::userload();
649:
650: # ---------------------------------------------------------- Are we overloaded?
651: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
652: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
653: if (!$unloaded) {
654: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
655: }
656: if ($unloaded) {
657: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
658: undef,\%form);
659: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
660: return OK;
661: }
662: }
663: if (($is_balancer) && ($hosthere)) {
664: $form{'noloadbalance'} = $hosthere;
665: }
666: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
667: \%form);
668: return OK;
669: }
670: }
671:
672: sub check_can_host {
673: my ($r,$form,$authhost,$domdesc) = @_;
674: return unless (ref($form) eq 'HASH');
675: my $canhost = 1;
676: my $lonhost = $r->dir_config('lonHostID');
677: my $udom = $form->{'udom'};
678: my @intdoms;
679: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
680: if (ref($internet_names) eq 'ARRAY') {
681: @intdoms = @{$internet_names};
682: }
683: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
684: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
685: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
686: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
687: my $hostname = &Apache::lonnet::hostname($lonhost);
688: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
689: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
690: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
691: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
692: my $loncaparev;
693: if ($authhost eq 'no_account_on_host') {
694: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
695: } else {
696: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
697: }
698: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
699: $udomdefaults{'remotesessions'},
700: $defdomdefaults{'hostedsessions'});
701: }
702: unless ($canhost) {
703: if ($authhost eq 'no_account_on_host') {
704: my $checkloginvia = 1;
705: my ($login_host,$hostname) =
706: &Apache::lonnet::choose_server($udom,$checkloginvia);
707: &Apache::loncommon::content_type($r,'text/html');
708: $r->send_http_header;
709: if ($login_host ne '') {
710: my $protocol = $Apache::lonnet::protocol{$login_host};
711: $protocol = 'http' if ($protocol ne 'https');
712: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
713: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
714: '<h3>'.&mt('Account creation').'</h3>'.
715: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
716: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
717: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
718: &Apache::loncommon::end_page());
719: } else {
720: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
721: '<h3>'.&mt('Account creation unavailable').'</h3>'.
722: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
723: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
724: &Apache::loncommon::end_page());
725: }
726: } else {
727: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
728: $form);
729: my ($otherserver) = &Apache::lonnet::choose_server($udom);
730: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
731: }
732: }
733: return $canhost;
734: }
735:
736: sub noswitch {
737: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
738: '<h3>'.&mt('Session unavailable').'</h3>'.
739: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
740: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
741: &Apache::loncommon::end_page();
742: return $result;
743: }
744:
745: sub loginhelpdisplay {
746: my ($authdomain) = @_;
747: my $login_help = 1;
748: my $lang = &Apache::lonlocal::current_language();
749: if ($login_help) {
750: my $dom = $authdomain;
751: if ($dom eq '') {
752: $dom = &Apache::lonnet::default_login_domain();
753: }
754: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
755: my $loginhelp_url;
756: if ($lang) {
757: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
758: if ($loginhelp_url ne '') {
759: return $loginhelp_url;
760: }
761: }
762: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
763: if ($loginhelp_url ne '') {
764: return $loginhelp_url;
765: } else {
766: return '/adm/loginproblems.html';
767: }
768: }
769: return;
770: }
771:
772: 1;
773: __END__
774:
775:
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