1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.145 2017/08/08 17:01:25 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:
45: # ------------------------------------------------------------ Successful login
46: sub success {
47: my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
48: $form) = @_;
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 $cookie; }
59:
60: # -------------------------------------------------------------------- Log this
61:
62: &Apache::lonnet::log($domain,$username,$authhost,
63: "Login $ENV{'REMOTE_ADDR'}");
64:
65: # ------------------------------------------------- Check for critical messages
66:
67: my @what=&Apache::lonnet::dump('critical',$domain,$username);
68: if ($what[0]) {
69: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
70: $lowerurl='/adm/email?critical=display';
71: }
72: }
73:
74: # ----------------------------------------------------------- Get cookies ready
75: my ($securecookie,$defaultcookie);
76: if ($ENV{'SERVER_PORT'} == 443) {
77: $securecookie="lonID=$cookie; path=/; HttpOnly; secure";
78: my $lonidsdir=$r->dir_config('lonIDsDir');
79: if (($lonidsdir) && (-e "$lonidsdir/$cookie.id")) {
80: my $linkname=substr(Digest::MD5::md5_hex(Digest::MD5::md5_hex(time(). {}. rand(). $$)), 0, 32).'_linked';
81: if (-e "$lonidsdir/$linkname.id") {
82: unlink("$lonidsdir/$linkname.id");
83: }
84: my $made_symlink = eval { symlink("$lonidsdir/$cookie.id",
85: "$lonidsdir/$linkname.id"); 1 };
86: if ($made_symlink) {
87: $defaultcookie = "lonLinkID=$linkname; path=/; HttpOnly;";
88: &Apache::lonnet::appenv({'user.linkedenv' => "$lonidsdir/$linkname.id"});
89: }
90: }
91: } else {
92: $defaultcookie = "lonID=$cookie; path=/; HttpOnly;";
93: }
94: # -------------------------------------------------------- Menu script and info
95: my $destination = $lowerurl;
96:
97: if (defined($form->{role})) {
98: my $envkey = 'user.role.'.$form->{role};
99: my $now=time;
100: my $then=$env{'user.login.time'};
101: my $refresh=$env{'user.refresh.time'};
102: my $update=$env{'user.update.time'};
103: if (!$update) {
104: $update = $then;
105: }
106: if (exists($env{$envkey})) {
107: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
108: &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
109: \$trolecode,\$tstatus,\$tstart,\$tend);
110: if ($tstatus eq 'is') {
111: $destination .= ($destination =~ /\?/) ? '&' : '?';
112: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
113: $destination .= 'selectrole=1&'.$newrole.'=1';
114: }
115: }
116: }
117: if (defined($form->{symb})) {
118: my $destsymb = $form->{symb};
119: $destination .= ($destination =~ /\?/) ? '&' : '?';
120: if ($destsymb =~ /___/) {
121: # FIXME Need to deal with encrypted symbs and urls as needed.
122: my ($map,$resid,$desturl)=split(/___/,$destsymb);
123: $desturl = &Apache::lonnet::clutter($desturl);
124: $desturl = &HTML::Entities::encode($desturl,'"<>&');
125: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
126: $destination .= 'destinationurl='.$desturl.
127: '&destsymb='.$destsymb;
128: } else {
129: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
130: $destination .= 'destinationurl='.$destsymb;
131: }
132: }
133: if ($destination =~ m{^/adm/roles}) {
134: $destination .= ($destination =~ /\?/) ? '&' : '?';
135: $destination .= 'source=login';
136: }
137:
138: my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
139: my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
140: my $brcrum = [{'href' => '',
141: 'text' => 'Successful Login'},];
142: my $args = {'bread_crumbs' => $brcrum,};
143: unless ((defined($form->{role})) || (defined($form->{symb}))) {
144: my $update=$env{'user.update.time'};
145: if (!$update) {
146: $update = $env{'user.login.time'};
147: }
148: my %roles_in_env;
149: my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
150: if ($showcount == 1) {
151: foreach my $rolecode (keys(%roles_in_env)) {
152: my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
153: if ($cid) {
154: my %coursedescription =
155: &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
156: if ($coursedescription{'type'} eq 'Placement') {
157: $args->{'crstype'} = 'Placement';
158: }
159: last;
160: }
161: }
162: }
163: }
164: my $start_page=&Apache::loncommon::start_page('Successful Login',
165: $header,$args);
166: my $end_page =&Apache::loncommon::end_page();
167:
168: my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
169: # ------------------------------------------------- Output for successful login
170:
171: &Apache::loncommon::content_type($r,'text/html');
172: if ($securecookie) {
173: $r->headers_out->add('Set-cookie' => $securecookie);
174: }
175: if ($defaultcookie) {
176: $r->headers_out->add('Set-cookie' => $defaultcookie);
177: }
178: $r->send_http_header;
179:
180: my %lt=&Apache::lonlocal::texthash(
181: 'wel' => 'Welcome',
182: 'pro' => 'Login problems?',
183: );
184: my $loginhelp = &loginhelpdisplay($domain);
185: if ($loginhelp) {
186: $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
187: }
188:
189: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
190: $r->print(<<ENDSUCCESS);
191: $start_page
192: $windowinfo
193: <h1>$lt{'wel'}</h1>
194: $welcome
195: $loginhelp
196: $continuelink
197: $end_page
198: ENDSUCCESS
199: return;
200: }
201:
202: # --------------------------------------------------------------- Failed login!
203:
204: sub failed {
205: my ($r,$message,$form) = @_;
206: (undef,undef,undef,my $clientmathml,my $clientunicode) =
207: &Apache::loncommon::decode_user_agent();
208: my $args = {};
209: if ($clientunicode && !$clientmathml) {
210: $args = {'browser.unicode' => 1};
211: }
212:
213: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
214: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
215: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
216: if (&Apache::lonnet::domain($udom,'description') eq '') {
217: undef($udom);
218: }
219: my $retry = '/adm/login';
220: if ($uname eq $form->{'uname'}) {
221: $retry .= '?username='.$uname;
222: }
223: if ($udom) {
224: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
225: }
226: if (exists($form->{role})) {
227: my $role = &Apache::loncommon::cleanup_html($form->{role});
228: if ($role ne '') {
229: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
230: }
231: }
232: if (exists($form->{symb})) {
233: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
234: if ($symb ne '') {
235: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
236: }
237: }
238: my $end_page = &Apache::loncommon::end_page();
239: &Apache::loncommon::content_type($r,'text/html');
240: $r->send_http_header;
241: my @actions =
242: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
243: my $loginhelp = &loginhelpdisplay($udom);
244: if ($loginhelp) {
245: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
246: }
247: #FIXME: link to helpdesk might be added here
248:
249: $r->print(
250: $start_page
251: .'<h2>'.&mt('Sorry ...').'</h2>'
252: .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
253: .&Apache::lonhtmlcommon::actionbox(\@actions)
254: .$end_page
255: );
256: }
257:
258: # ------------------------------------------------------------------ Rerouting!
259:
260: sub reroute {
261: my ($r) = @_;
262: &Apache::loncommon::content_type($r,'text/html');
263: $r->send_http_header;
264: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
265: .&mt('Please [_1]log in again[_2].');
266: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
267: }
268:
269: # ---------------------------------------------------------------- Main handler
270:
271: sub handler {
272: my $r = shift;
273: my $londocroot = $r->dir_config('lonDocRoot');
274: # Are we re-routing?
275: if (-e "$londocroot/lon-status/reroute.txt") {
276: &reroute($r);
277: return OK;
278: }
279:
280: &Apache::lonlocal::get_language_handle($r);
281:
282: # -------------------------------- Prevent users from attempting to login twice
283: my $handle = &Apache::lonnet::check_for_valid_session($r);
284: if ($handle ne '') {
285: my $lonidsdir=$r->dir_config('lonIDsDir');
286: if ($handle=~/^publicuser\_/) {
287: # For "public user" - remove it, we apparently really want to login
288: unlink($r->dir_config('lonIDsDir')."/$handle.id");
289: } else {
290: # Indeed, a valid token is found
291: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
292: &Apache::loncommon::content_type($r,'text/html');
293: $r->send_http_header;
294: my $start_page =
295: &Apache::loncommon::start_page('Already logged in');
296: my $end_page =
297: &Apache::loncommon::end_page();
298: my $dest = '/adm/roles';
299: if ($env{'form.firsturl'} ne '') {
300: $dest = $env{'form.firsturl'};
301: }
302: $r->print(
303: $start_page
304: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
305: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
306: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
307: .'</p>'
308: .$end_page
309: );
310: return OK;
311: }
312: }
313:
314: # ---------------------------------------------------- No valid token, continue
315:
316:
317: my $buffer;
318: if ($r->header_in('Content-length') > 0) {
319: $r->read($buffer,$r->header_in('Content-length'),0);
320: }
321: my %form;
322: foreach my $pair (split(/&/,$buffer)) {
323: my ($name,$value) = split(/=/,$pair);
324: $value =~ tr/+/ /;
325: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
326: $form{$name}=$value;
327: }
328:
329: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
330: &failed($r,'Username, password and domain need to be specified.',
331: \%form);
332: return OK;
333: }
334:
335: # split user logging in and "su"-user
336:
337: ($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
338: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
339: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
340: $form{'udom'} = &LONCAPA::clean_domain($form{'udom'});
341: $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
342:
343: my $role = $r->dir_config('lonRole');
344: my $domain = $r->dir_config('lonDefDomain');
345: my $prodir = $r->dir_config('lonUsersDir');
346: my $contact_name = &mt('LON-CAPA helpdesk');
347:
348: # ---------------------------------------- Get the information from login token
349:
350: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
351: $form{'serverid'});
352:
353: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
354: ($tmpinfo eq 'no_such_host')) {
355: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
356: return OK;
357: } else {
358: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
359: $form{'serverid'});
360: if ( $reply ne 'ok' ) {
361: &failed($r,'Session could not be opened.',\%form);
362: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
363: return OK;
364: }
365: }
366:
367: if (!&Apache::lonnet::domain($form{'udom'})) {
368: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
369: return OK;
370: }
371:
372: my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
373: if ($rolestr) {
374: $rolestr = &unescape($rolestr);
375: }
376: if ($symbstr) {
377: $symbstr= &unescape($symbstr);
378: }
379: if ($iptokenstr) {
380: $iptokenstr = &unescape($iptokenstr);
381: }
382: if ($rolestr =~ /^role=/) {
383: (undef,$form{'role'}) = split('=',$rolestr);
384: }
385: if ($symbstr =~ /^symb=/) {
386: (undef,$form{'symb'}) = split('=',$symbstr);
387: }
388: if ($iptokenstr =~ /^iptoken=/) {
389: (undef,$form{'iptoken'}) = split('=',$iptokenstr);
390: }
391:
392: my $upass = $ENV{HTTPS} ? $form{'upass0'}
393: : &Apache::loncommon::des_decrypt($key,$form{'upass0'});
394:
395: # ---------------------------------------------------------------- Authenticate
396:
397: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
398: my ($cancreate,$statustocreate) =
399: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
400: my $defaultauth;
401: if (ref($cancreate) eq 'ARRAY') {
402: if (grep(/^login$/,@{$cancreate})) {
403: $defaultauth = 1;
404: }
405: }
406: my $clientcancheckhost = 1;
407: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
408: $form{'udom'},$defaultauth,
409: $clientcancheckhost);
410:
411: # --------------------------------------------------------------------- Failed?
412:
413: if ($authhost eq 'no_host') {
414: &failed($r,'Username and/or password could not be authenticated.',
415: \%form);
416: return OK;
417: } elsif ($authhost eq 'no_account_on_host') {
418: if ($defaultauth) {
419: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
420: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
421: return OK;
422: }
423: my $start_page =
424: &Apache::loncommon::start_page('Create a user account in LON-CAPA');
425: my $lonhost = $r->dir_config('lonHostID');
426: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
427: my $contacts =
428: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
429: $form{'udom'},$origmail);
430: my ($contact_email) = split(',',$contacts);
431: my $output =
432: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
433: $domdesc,'',$lonhost,
434: $contact_email,$contact_name,
435: undef,$statustocreate);
436: &Apache::loncommon::content_type($r,'text/html');
437: $r->send_http_header;
438: &Apache::createaccount::print_header($r,$start_page);
439: $r->print('<h3>'.&mt('Account creation').'</h3>'.
440: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
441: $output.&Apache::loncommon::end_page());
442: return OK;
443: } else {
444: &failed($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);
445: return OK;
446: }
447: }
448:
449: if (($firsturl eq '') ||
450: ($firsturl=~/^\/adm\/(logout|remote)/)) {
451: $firsturl='/adm/roles';
452: }
453:
454: my $hosthere;
455: if ($form{'iptoken'}) {
456: my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
457: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
458: if (($sessiondata{'domain'} eq $form{'udom'}) &&
459: ($sessiondata{'username'} eq $form{'uname'})) {
460: $hosthere = 1;
461: }
462: }
463:
464: # --------------------------------- Are we attempting to login as somebody else?
465: if ($form{'suname'}) {
466: my ($suname,$sudom,$sudomref);
467: $suname = $form{'suname'};
468: $sudom = $form{'udom'};
469: if ($form{'sudom'}) {
470: unless ($sudom eq $form{'sudom'}) {
471: if (&Apache::lonnet::domain($form{'sudom'})) {
472: $sudomref = [$form{'sudom'}];
473: $sudom = $form{'sudom'};
474: }
475: }
476: }
477: # ------------ see if the original user has enough privileges to pull this stunt
478: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
479: # ---------------------------------------------------- see if the su-user exists
480: unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
481: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($suname,$sudom));
482: # ------------------------------ see if the su-user is not too highly privileged
483: unless (&Apache::lonnet::privileged($suname,$sudom)) {
484: #
485: # su-user's home server and user's home server must have one of:
486: # (a) same internet dom
487: # (b) same primary library server for home server's domain
488: # (c) same "internet domain" for primary library server for home server's domain
489: #
490: unless ($sudom eq $form{'udom'}) {
491: my $suprim = &Apache::lonnet::domain($sudom,'primary');
492: my $uprim = &Apache::lonnet::domain($sudom,'primary');
493: unless ($suprim eq $uprim) {
494: my $suintdom = &Apache::lonnet::internet_dom($suprim);
495: my $uintdom = &Apache::lonnet::internet_dom($uprim);
496: unless ($suintdom eq $uintdom) {
497: &Apache::lonnet::logthis('Attempted switch user '
498: .'to privileged user');
499: }
500: }
501: }
502:
503: # -------------------------------------------------------- actually switch users
504:
505: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
506: ' logging in as '.$suname.':'.$sudom);
507: $form{'uname'}=$suname;
508: if ($form{'udom'} ne $sudom) {
509: $form{'udom'}=$sudom;
510: }
511: } else {
512: &Apache::lonnet::logthis('Attempted switch user to privileged user');
513: }
514: }
515: } else {
516: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
517: }
518: }
519:
520: my ($is_balancer,$otherserver);
521:
522: unless ($hosthere) {
523: ($is_balancer,$otherserver) =
524: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
525: if ($is_balancer) {
526: if ($otherserver eq '') {
527: my $lowest_load;
528: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
529: if ($lowest_load > 100) {
530: $otherserver = &Apache::lonnet::spareserver($lowest_load,$lowest_load,1,$form{'udom'});
531: }
532: }
533: if ($otherserver ne '') {
534: my @hosts = &Apache::lonnet::current_machine_ids();
535: if (grep(/^\Q$otherserver\E$/,@hosts)) {
536: $hosthere = $otherserver;
537: }
538: }
539: }
540: }
541:
542: if (($is_balancer) && (!$hosthere)) {
543: if ($otherserver) {
544: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
545: \%form);
546: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
547: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
548: $switchto .= '&origurl='.$firsturl;
549: }
550: if ($form{'role'}) {
551: $switchto .= '&role='.$form{'role'};
552: }
553: if ($form{'symb'}) {
554: $switchto .= '&symb='.$form{'symb'};
555: }
556: $r->internal_redirect($switchto);
557: } else {
558: $r->print(&noswitch());
559: }
560: return OK;
561: } else {
562: if (!&check_can_host($r,\%form,$authhost)) {
563: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
564: if ($otherserver) {
565: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
566: \%form);
567: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
568: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
569: $switchto .= '&origurl='.$firsturl;
570: }
571: if ($form{'role'}) {
572: $switchto .= '&role='.$form{'role'};
573: }
574: if ($form{'symb'}) {
575: $switchto .= '&symb='.$form{'symb'};
576: }
577: $r->internal_redirect($switchto);
578: } else {
579: $r->print(&noswitch());
580: }
581: return OK;
582: }
583:
584: # ------------------------------------------------------- Do the load balancing
585:
586: # ---------------------------------------------------------- Determine own load
587: my $loadlim = $r->dir_config('lonLoadLim');
588: my $loadavg;
589: {
590: my $loadfile=Apache::File->new('/proc/loadavg');
591: $loadavg=<$loadfile>;
592: }
593: $loadavg =~ s/\s.*//g;
594: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
595: my $userloadpercent=&Apache::lonnet::userload();
596:
597: # ---------------------------------------------------------- Are we overloaded?
598: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
599: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
600: if (!$unloaded) {
601: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
602: }
603: if ($unloaded) {
604: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
605: undef,\%form);
606: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
607: return OK;
608: }
609: }
610: if (($is_balancer) && ($hosthere)) {
611: $form{'noloadbalance'} = $hosthere;
612: }
613: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
614: \%form);
615: return OK;
616: }
617: }
618:
619: sub check_can_host {
620: my ($r,$form,$authhost,$domdesc) = @_;
621: return unless (ref($form) eq 'HASH');
622: my $canhost = 1;
623: my $lonhost = $r->dir_config('lonHostID');
624: my $udom = $form->{'udom'};
625: my @intdoms;
626: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
627: if (ref($internet_names) eq 'ARRAY') {
628: @intdoms = @{$internet_names};
629: }
630: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
631: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
632: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
633: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
634: my $hostname = &Apache::lonnet::hostname($lonhost);
635: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
636: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
637: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
638: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
639: my $loncaparev;
640: if ($authhost eq 'no_account_on_host') {
641: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
642: } else {
643: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
644: }
645: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
646: $udomdefaults{'remotesessions'},
647: $defdomdefaults{'hostedsessions'});
648: }
649: unless ($canhost) {
650: if ($authhost eq 'no_account_on_host') {
651: my $checkloginvia = 1;
652: my ($login_host,$hostname) =
653: &Apache::lonnet::choose_server($udom,$checkloginvia);
654: &Apache::loncommon::content_type($r,'text/html');
655: $r->send_http_header;
656: if ($login_host ne '') {
657: my $protocol = $Apache::lonnet::protocol{$login_host};
658: $protocol = 'http' if ($protocol ne 'https');
659: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
660: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
661: '<h3>'.&mt('Account creation').'</h3>'.
662: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
663: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
664: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
665: &Apache::loncommon::end_page());
666: } else {
667: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
668: '<h3>'.&mt('Account creation unavailable').'</h3>'.
669: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
670: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
671: &Apache::loncommon::end_page());
672: }
673: } else {
674: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
675: $form);
676: my ($otherserver) = &Apache::lonnet::choose_server($udom);
677: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
678: }
679: }
680: return $canhost;
681: }
682:
683: sub noswitch {
684: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
685: '<h3>'.&mt('Session unavailable').'</h3>'.
686: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
687: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
688: &Apache::loncommon::end_page();
689: return $result;
690: }
691:
692: sub loginhelpdisplay {
693: my ($authdomain) = @_;
694: my $login_help = 1;
695: my $lang = &Apache::lonlocal::current_language();
696: if ($login_help) {
697: my $dom = $authdomain;
698: if ($dom eq '') {
699: $dom = &Apache::lonnet::default_login_domain();
700: }
701: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
702: my $loginhelp_url;
703: if ($lang) {
704: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
705: if ($loginhelp_url ne '') {
706: return $loginhelp_url;
707: }
708: }
709: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
710: if ($loginhelp_url ne '') {
711: return $loginhelp_url;
712: } else {
713: return '/adm/loginproblems.html';
714: }
715: }
716: return;
717: }
718:
719: 1;
720: __END__
721:
722:
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