1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.121.2.24.2.1 2021/12/30 06:00:16 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: if (($env{'request.deeplink.login'} eq $lowerurl) &&
152: (($env{'request.linkprot'}) || ($env{'request.linkkey'} ne ''))) {
153: my %info;
154: if ($env{'request.linkprot'}) {
155: $info{'linkprot'} = $env{'request.linkprot'};
156: } elsif ($env{'request.linkkey'} ne '') {
157: $info{'linkkey'} = $env{'request.linkkey'};
158: }
159: $info{'origurl'} = $lowerurl;
160: my $token = &Apache::lonnet::tmpput(\%info,$r->dir_config('lonHostID'),'link');
161: unless (($token eq 'con_lost') || ($token eq 'refused') ||
162: ($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
163: $destination .= (($destination =~ /\?/) ? '&' : '?') . 'ttoken='.$token;
164: }
165: }
166:
167: my $windowinfo=&Apache::lonmenu::open($env{'browser.os'});
168: my $startupremote=&Apache::lonmenu::startupremote($destination);
169: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
170: my $setflags=&Apache::lonmenu::setflags();
171: my $maincall=&Apache::lonmenu::maincall();
172: my $brcrum = [{'href' => '',
173: 'text' => 'Successful Login'},];
174: my $start_page=&Apache::loncommon::start_page('Successful Login',
175: $startupremote,
176: {'no_inline_link' => 1,
177: 'bread_crumbs' => $brcrum,});
178: my $end_page =&Apache::loncommon::end_page();
179:
180: my $continuelink;
181: if ($env{'environment.remote'} eq 'off') {
182: $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
183: }
184: # ------------------------------------------------- Output for successful login
185:
186: &Apache::loncommon::content_type($r,'text/html');
187: if ($securecookie) {
188: $r->headers_out->add('Set-cookie' => $securecookie);
189: }
190: if ($defaultcookie) {
191: $r->headers_out->add('Set-cookie' => $defaultcookie);
192: }
193: if ($expirepub) {
194: my $c = new CGI::Cookie(-name => 'lonPubID',
195: -value => '',
196: -expires => '-10y',);
197: $r->headers_out->add('Set-cookie' => $c);
198: }
199: $r->send_http_header;
200:
201: my %lt=&Apache::lonlocal::texthash(
202: 'wel' => 'Welcome',
203: 'pro' => 'Login problems?',
204: );
205: my $loginhelp = &loginhelpdisplay($domain);
206: if ($loginhelp) {
207: $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
208: }
209:
210: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
211: $r->print(<<ENDSUCCESS);
212: $start_page
213: $setflags
214: $windowinfo
215: <h1>$lt{'wel'}</h1>
216: $welcome
217: $loginhelp
218: $remoteinfo
219: $maincall
220: $continuelink
221: $end_page
222: ENDSUCCESS
223: return;
224: }
225:
226: # --------------------------------------------------------------- Failed login!
227:
228: sub failed {
229: my ($r,$message,$form,$authhost) = @_;
230: (undef,undef,undef,my $clientmathml,my $clientunicode) =
231: &Apache::loncommon::decode_user_agent();
232: my $args = {};
233: if ($clientunicode && !$clientmathml) {
234: $args = {'browser.unicode' => 1};
235: }
236:
237: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
238: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
239: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
240: if (&Apache::lonnet::domain($udom,'description') eq '') {
241: undef($udom);
242: }
243: my $retry = '/adm/login';
244: if ($uname eq $form->{'uname'}) {
245: $retry .= '?username='.$uname;
246: }
247: if ($udom) {
248: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
249: }
250: my $lonhost = $r->dir_config('lonHostID');
251: my $querystr;
252: my $result = &set_retry_token($form,$lonhost,\$querystr);
253: if ($result eq 'fail') {
254: if (exists($form->{role})) {
255: my $role = &Apache::loncommon::cleanup_html($form->{role});
256: if ($role ne '') {
257: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
258: }
259: }
260: if (exists($form->{symb})) {
261: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
262: if ($symb ne '') {
263: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
264: }
265: }
266: if (exists($form->{firsturl})) {
267: my $firsturl = &Apache::loncommon::cleanup_html($form->{firsturl});
268: if ($firsturl ne '') {
269: $retry .= (($retry=~/\?/)?'&':'?').'firsturl='.$firsturl;
270: if ($form->{firsturl} =~ m{^/tiny/$match_domain/\w+$}) {
271: unless (exists($form->{linkprot})) {
272: if (exists($form->{linkkey})) {
273: $retry .= 'linkkey='.$form->{linkkey};
274: }
275: }
276: }
277: }
278: }
279: if (exists($form->{linkprot})) {
280: my $ltoken = &Apache::lonnet::tmpput({linkprot => $form->{'linkprot'}},
281: $r->dir_config('lonHostID'),'retry');
282: if ($ltoken) {
283: $retry .= (($retry =~ /\?/) ? '&' : '?').'ltoken='.$ltoken;
284: }
285: }
286: } elsif ($querystr ne '') {
287: $retry .= (($retry=~/\?/)?'&':'?').$querystr;
288: }
289: my $end_page = &Apache::loncommon::end_page();
290: &Apache::loncommon::content_type($r,'text/html');
291: $r->send_http_header;
292: my @actions =
293: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
294: my $loginhelp = &loginhelpdisplay($udom);
295: if ($loginhelp) {
296: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
297: }
298: #FIXME: link to helpdesk might be added here
299:
300: $r->print(
301: $start_page
302: .'<h2>'.&mt('Sorry ...').'</h2>'
303: .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
304: .&Apache::lonhtmlcommon::actionbox(\@actions)
305: .$end_page
306: );
307: }
308:
309: # ------------------------------------------------------------------ Rerouting!
310:
311: sub reroute {
312: my ($r) = @_;
313: &Apache::loncommon::content_type($r,'text/html');
314: $r->send_http_header;
315: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
316: .&mt('Please [_1]log in again[_2].');
317: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
318: }
319:
320: # ---------------------------------------------------------------- Main handler
321:
322: sub handler {
323: my $r = shift;
324: my $londocroot = $r->dir_config('lonDocRoot');
325: # Are we re-routing?
326: if (-e "$londocroot/lon-status/reroute.txt") {
327: &reroute($r);
328: return OK;
329: }
330:
331: &Apache::lonlocal::get_language_handle($r);
332:
333: # -------------------------------- Prevent users from attempting to login twice
334: my $handle = &Apache::lonnet::check_for_valid_session($r);
335: if ($handle ne '') {
336: my $lonidsdir=$r->dir_config('lonIDsDir');
337: if ($handle=~/^publicuser\_/) {
338: # For "public user" - remove it, we apparently really want to login
339: unlink($r->dir_config('lonIDsDir')."/$handle.id");
340: } else {
341: # Indeed, a valid token is found
342: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
343: &Apache::loncommon::content_type($r,'text/html');
344: $r->send_http_header;
345: my $start_page =
346: &Apache::loncommon::start_page('Already logged in');
347: my $end_page =
348: &Apache::loncommon::end_page();
349: my $dest = '/adm/roles';
350: my %form = &get_form_items($r);
351: if ($form{'logtoken'}) {
352: my $tmpinfo = &Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
353: $form{'serverid'});
354: unless (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
355: ($tmpinfo eq 'no_such_host')) {
356: my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
357: $firsturl = &unescape($firsturl);
358: my %info;
359: foreach my $item (@rest) {
360: my ($key,$value) = split(/=/,$item);
361: $info{$key} = &unescape($value);
362: }
363: if ($firsturl ne '') {
364: $info{'firsturl'} = $firsturl;
365: $dest = $firsturl;
366: my $relogin;
367: if ($dest =~ m{^/tiny/$match_domain/\w+$}) {
368: if ($env{'request.course.id'}) {
369: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
370: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
371: my $symb = &Apache::loncommon::symb_from_tinyurl($dest,$cnum,$cdom);
372: if ($symb) {
373: unless (&set_deeplink_login(%info) eq 'ok') {
374: $relogin = 1;
375: }
376: }
377: }
378: if ($relogin) {
379: $r->print(
380: $start_page
381: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
382: .'<p>'.&mt('Please [_1]log out[_2] first, and then try your access again',
383: '<a href="/adm/logout">','</a>')
384: .'</p>'
385: .$end_page);
386: } else {
387: if (($info{'linkprot'}) || ($info{'linkkey'} ne '')) {
388: my $token = &Apache::lonnet::tmpput(\%info,$r->dir_config('lonHostID'),'link');
389: unless (($token eq 'con_lost') || ($token eq 'refused') ||
390: ($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
391: $dest .= (($dest =~ /\?/) ? '&' : '?') . 'ttoken='.$token;
392: }
393: }
394: $r->print(
395: $start_page
396: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
397: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4] first, and then try your access again',
398: '<a href="'.$dest.'">','</a>',
399: '<a href="/adm/logout">','</a>')
400: .'</p>'
401: .$end_page);
402: }
403: return OK;
404: }
405: }
406: }
407: }
408: $r->print(
409: $start_page
410: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
411: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
412: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
413: .'</p>'
414: .$end_page
415: );
416: return OK;
417: }
418: }
419:
420: # ---------------------------------------------------- No valid token, continue
421:
422: my %form = &get_form_items($r);
423: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
424: &failed($r,'Username, password and domain need to be specified.',
425: \%form);
426: return OK;
427: }
428:
429: # split user logging in and "su"-user
430:
431: ($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
432: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
433: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
434: $form{'udom'} = &LONCAPA::clean_domain($form{'udom'});
435: $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
436:
437: my $role = $r->dir_config('lonRole');
438: my $domain = $r->dir_config('lonDefDomain');
439: my $prodir = $r->dir_config('lonUsersDir');
440: my $contact_name = &mt('LON-CAPA helpdesk');
441:
442: # ---------------------------------------- Get the information from login token
443:
444: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
445: $form{'serverid'});
446:
447: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
448: ($tmpinfo eq 'no_such_host')) {
449: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
450: return OK;
451: } else {
452: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
453: $form{'serverid'});
454: if ( $reply ne 'ok' ) {
455: &failed($r,'Session could not be opened.',\%form);
456: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
457: return OK;
458: }
459: }
460:
461: if (!&Apache::lonnet::domain($form{'udom'})) {
462: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
463: return OK;
464: }
465:
466: my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
467: $firsturl = &unescape($firsturl);
468: foreach my $item (@rest) {
469: my ($key,$value) = split(/=/,$item);
470: $form{$key} = &unescape($value);
471: }
472: if ($firsturl =~ m{^/tiny/$match_domain/\w+$}) {
473: $form{'firsturl'} = $firsturl;
474: }
475: my $upass = &Apache::loncommon::des_decrypt($des_key,$form{'upass0'});
476:
477: # ---------------------------------------------------------------- Authenticate
478:
479: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
480: my ($cancreate,$statustocreate) =
481: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
482: my $defaultauth;
483: if (ref($cancreate) eq 'ARRAY') {
484: if (grep(/^login$/,@{$cancreate})) {
485: $defaultauth = 1;
486: }
487: }
488: my $clientcancheckhost = 1;
489: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
490: $form{'udom'},$defaultauth,
491: $clientcancheckhost);
492:
493: # --------------------------------------------------------------------- Failed?
494:
495: if ($authhost eq 'no_host') {
496: &failed($r,'Username and/or password could not be authenticated.',
497: \%form);
498: return OK;
499: } elsif ($authhost eq 'no_account_on_host') {
500: if ($defaultauth) {
501: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
502: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
503: return OK;
504: }
505: my $start_page =
506: &Apache::loncommon::start_page('Create a user account in LON-CAPA',
507: '',{'no_inline_link' => 1,});
508: my $lonhost = $r->dir_config('lonHostID');
509: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
510: my $contacts =
511: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
512: $form{'udom'},$origmail);
513: my ($contact_email) = split(',',$contacts);
514: my $output =
515: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
516: $domdesc,'',$lonhost,
517: $contact_email,$contact_name,
518: undef,$statustocreate);
519: &Apache::loncommon::content_type($r,'text/html');
520: $r->send_http_header;
521: &Apache::createaccount::print_header($r,$start_page);
522: $r->print('<h3>'.&mt('Account creation').'</h3>'.
523: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
524: $output.&Apache::loncommon::end_page());
525: return OK;
526: } else {
527: &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);
528: return OK;
529: }
530: }
531:
532: if (($firsturl eq '') ||
533: ($firsturl=~/^\/adm\/(logout|remote)/)) {
534: $firsturl='/adm/roles';
535: }
536:
537: my ($hosthere,%sessiondata);
538: if ($form{'iptoken'}) {
539: %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
540: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
541: if (($sessiondata{'domain'} eq $form{'udom'}) &&
542: ($sessiondata{'username'} eq $form{'uname'})) {
543: $hosthere = 1;
544: }
545: }
546:
547: # --------------------------------- Are we attempting to login as somebody else?
548: if ($form{'suname'}) {
549: my ($suname,$sudom,$sudomref);
550: $suname = $form{'suname'};
551: $sudom = $form{'udom'};
552: if ($form{'sudom'}) {
553: unless ($sudom eq $form{'sudom'}) {
554: if (&Apache::lonnet::domain($form{'sudom'})) {
555: $sudomref = [$form{'sudom'}];
556: $sudom = $form{'sudom'};
557: }
558: }
559: }
560: # ------------ see if the original user has enough privileges to pull this stunt
561: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
562: # ---------------------------------------------------- see if the su-user exists
563: unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
564: # ------------------------------ see if the su-user is not too highly privileged
565: if (&Apache::lonnet::privileged($suname,$sudom)) {
566: &Apache::lonnet::logthis('Attempted switch user to privileged user');
567: } else {
568: my $noprivswitch;
569: #
570: # su-user's home server and user's home server must have one of:
571: # (a) same domain
572: # (b) same primary library server for the two domains
573: # (c) same "internet domain" for primary library server(s) for home servers' domains
574: #
575: my $suprim = &Apache::lonnet::domain($sudom,'primary');
576: my $suintdom = &Apache::lonnet::internet_dom($suprim);
577: unless ($sudom eq $form{'udom'}) {
578: my $uprim = &Apache::lonnet::domain($form{'udom'},'primary');
579: my $uintdom = &Apache::lonnet::internet_dom($uprim);
580: unless ($suprim eq $uprim) {
581: unless ($suintdom eq $uintdom) {
582: &Apache::lonnet::logthis('Attempted switch user '
583: .'to user with different "internet domain".');
584: $noprivswitch = 1;
585: }
586: }
587: }
588:
589: unless ($noprivswitch) {
590: #
591: # server where log-in occurs must have same "internet domain" as su-user's home
592: # server
593: #
594: my $lonhost = $r->dir_config('lonHostID');
595: my $hostintdom = &Apache::lonnet::internet_dom($lonhost);
596: if ($hostintdom ne $suintdom) {
597: &Apache::lonnet::logthis('Attempted switch user on a '
598: .'server with a different "internet domain".');
599: } else {
600:
601: # -------------------------------------------------------- actually switch users
602:
603: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.
604: $form{'udom'}.' logging in as '.$suname.':'.$sudom);
605: $form{'uname'}=$suname;
606: if ($form{'udom'} ne $sudom) {
607: $form{'udom'}=$sudom;
608: }
609: }
610: }
611: }
612: }
613: } else {
614: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
615: }
616: }
617:
618: my ($is_balancer,$otherserver);
619:
620: unless ($hosthere) {
621: ($is_balancer,$otherserver) =
622: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
623: if ($is_balancer) {
624: # Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
625: my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
626: if (($found_server) && ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
627: $otherserver = $found_server;
628: }
629: if ($otherserver eq '') {
630: my $lowest_load;
631: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
632: if ($lowest_load > 100) {
633: $otherserver = &Apache::lonnet::spareserver($r,$lowest_load,$lowest_load,1,$form{'udom'});
634: }
635: }
636: if ($otherserver ne '') {
637: my @hosts = &Apache::lonnet::current_machine_ids();
638: if (grep(/^\Q$otherserver\E$/,@hosts)) {
639: $hosthere = $otherserver;
640: }
641: }
642: }
643: }
644:
645: if (($is_balancer) && (!$hosthere)) {
646: if ($otherserver) {
647: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
648: \%form);
649: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
650: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
651: $switchto .= '&origurl='.$firsturl;
652: }
653: if ($form{'role'}) {
654: $switchto .= '&role='.$form{'role'};
655: }
656: if ($form{'symb'}) {
657: $switchto .= '&symb='.$form{'symb'};
658: }
659: if ($form{'linkprot'}) {
660: $env{'request.linkprot'} = $form{'linkprot'};
661: } elsif ($form{'linkkey'} ne '') {
662: $env{'request.linkkey'} = $form{'linkkey'};
663: }
664: if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
665: &set_deeplink_login(%form);
666: }
667: $r->internal_redirect($switchto);
668: } else {
669: &Apache::loncommon::content_type($r,'text/html');
670: $r->send_http_header;
671: $r->print(&noswitch());
672: }
673: return OK;
674: } else {
675: if (!&check_can_host($r,\%form,$authhost)) {
676: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
677: if ($otherserver) {
678: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
679: \%form);
680: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
681: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
682: $switchto .= '&origurl='.$firsturl;
683: }
684: if ($form{'role'}) {
685: $switchto .= '&role='.$form{'role'};
686: }
687: if ($form{'symb'}) {
688: $switchto .= '&symb='.$form{'symb'};
689: }
690: if ($form{'linkprot'}) {
691: $env{'request.linkprot'} = $form{'linkprot'};
692: } elsif ($form{'linkkey'} ne '') {
693: $env{'request.linkkey'} = $form{'linkkey'};
694: }
695: if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
696: &set_deeplink_login(%form);
697: }
698: $r->internal_redirect($switchto);
699: } else {
700: &Apache::loncommon::content_type($r,'text/html');
701: $r->send_http_header;
702: $r->print(&noswitch());
703: }
704: return OK;
705: }
706:
707: # ------------------------------------------------------- Do the load balancing
708:
709: # ---------------------------------------------------------- Determine own load
710: my $loadlim = $r->dir_config('lonLoadLim');
711: my $loadavg;
712: {
713: my $loadfile=Apache::File->new('/proc/loadavg');
714: $loadavg=<$loadfile>;
715: }
716: $loadavg =~ s/\s.*//g;
717: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
718: my $userloadpercent=&Apache::lonnet::userload();
719:
720: # ---------------------------------------------------------- Are we overloaded?
721: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
722: my $unloaded=Apache::lonnet::spareserver($r,$loadpercent,$userloadpercent,1,$form{'udom'});
723: if (!$unloaded) {
724: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
725: }
726: if ($unloaded) {
727: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
728: undef,\%form);
729: if ($form{'linkprot'}) {
730: $env{'request.linkprot'} = $form{'linkprot'};
731: } elsif ($form{'linkkey'} ne '') {
732: $env{'request.linkkey'} = $form{'linkkey'};
733: }
734: if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
735: &set_deeplink_login(%form);
736: }
737: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
738: return OK;
739: }
740: }
741: if (($is_balancer) && ($hosthere)) {
742: $form{'noloadbalance'} = $hosthere;
743: }
744: my $extra_env;
745: if (($hosthere) && ($sessiondata{'sessionserver'} ne '')) {
746: if ($sessiondata{'origurl'} ne '') {
747: $firsturl = $sessiondata{'origurl'};
748: $form{'firsturl'} = $sessiondata{'origurl'};
749: my @names = ('role','symb','linkprot','linkkey');
750: foreach my $item (@names) {
751: if ($sessiondata{$item} ne '') {
752: $form{$item} = $sessiondata{$item};
753: }
754: }
755: }
756: }
757: if ($form{'linkprot'}) {
758: my ($linkprotector,$uri) = split(/:/,$form{'linkprot'},2);
759: if ($linkprotector) {
760: $extra_env = {'user.linkprotector' => $linkprotector,
761: 'user.linkproturi' => $uri};
762: }
763: } elsif ($form{'linkkey'} ne '') {
764: $extra_env = {'user.deeplinkkey' => $form{'linkkey'},
765: 'user.keyedlinkuri' => $form{'firsturl'}};
766: }
767: if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
768: &set_deeplink_login(%form);
769: if ($form{'linkprot'}) {
770: if (ref($extra_env) eq 'HASH') {
771: %{$extra_env} = ( %{$extra_env}, 'request.linkprot' => $form{'linkprot'} );
772: } else {
773: $extra_env = {'request.linkprot' => $form{'linkprot'}};
774: }
775: } elsif ($form{'linkkey'} ne '') {
776: if (ref($extra_env) eq 'HASH') {
777: %{$extra_env} = ( %{$extra_env}, 'request.linkkey' => $form{'linkkey'} );
778: } else {
779: $extra_env = {'request.linkkey' => $form{'linkkey'}};
780: }
781: }
782: if ($env{'request.deeplink.login'}) {
783: if (ref($extra_env) eq 'HASH') {
784: %{$extra_env} = ( %{$extra_env}, 'request.deeplink.login' => $form{'firsturl'} );
785: } else {
786: $extra_env = {'request.deeplink.login' => $form{'firsturl'}};
787: }
788: }
789: }
790: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,$extra_env,
791: \%form);
792: return OK;
793: }
794: }
795:
796: sub get_form_items {
797: my ($r) = @_;
798: my $buffer;
799: if ($r->header_in('Content-length') > 0) {
800: $r->read($buffer,$r->header_in('Content-length'),0);
801: }
802: my %form;
803: foreach my $pair (split(/&/,$buffer)) {
804: my ($name,$value) = split(/=/,$pair);
805: $value =~ tr/+/ /;
806: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
807: $form{$name}=$value;
808: }
809: return %form;
810: }
811:
812: sub set_deeplink_login {
813: my (%form) = @_;
814: my $disallow;
815: if ($form{'firsturl'} =~ m{^/tiny/($match_domain)/\w+$}) {
816: my $cdom = $1;
817: my ($cnum,$symb) = &Apache::loncommon::symb_from_tinyurl($form{'firsturl'},'',$cdom);
818: if ($symb) {
819: if ($env{'request.course.id'} eq $cdom.'_'.$cnum) {
820: my $deeplink;
821: if ($symb =~ /\.(page|sequence)$/) {
822: my $mapname = &Apache::lonnet::deversion((&Apache::lonnet::decode_symb($symb))[2]);
823: my $navmap = Apache::lonnavmaps::navmap->new();
824: if (ref($navmap)) {
825: $deeplink = $navmap->get_mapparam(undef,$mapname,'0.deeplink');
826: }
827: } else {
828: $deeplink = &Apache::lonnet::EXT('resource.0.deeplink',$symb);
829: }
830: if ($deeplink ne '') {
831: my ($state,$others,$listed,$scope,$protect) = split(/,/,$deeplink);
832: if (($protect ne 'none') && ($protect ne '')) {
833: my ($acctype,$item) = split(/:/,$protect);
834: if ($acctype =~ /lti(c|d)$/) {
835: unless ($form{'linkprot'} eq $item.$1.':'.$env{'request.deeplink.login'}) {
836: $disallow = 1;
837: }
838: } elsif ($acctype eq 'key') {
839: unless ($form{'linkkey'} eq $item) {
840: $disallow = 1;
841: }
842: }
843: }
844: }
845: unless ($disallow) {
846: $env{'request.deeplink.login'} = $form{'firsturl'};
847: }
848: } else {
849: $env{'request.deeplink.login'} = $form{'firsturl'};
850: }
851: }
852: }
853: if ($disallow) {
854: return;
855: }
856: return 'ok';
857: }
858:
859: sub set_retry_token {
860: my ($form,$lonhost,$querystr) = @_;
861: if (ref($form) eq 'HASH') {
862: my ($firsturl,$token,$extras,@names);
863: @names = ('role','symb','linkprot','linkkey','iptoken');
864: foreach my $name (@names) {
865: if ($form->{$name} ne '') {
866: $extras .= '&'.$name.'='.&escape($form->{$name});
867: last if ($name eq 'linkprot');
868: }
869: }
870: my $firsturl = $form->{'firsturl'};
871: if (($firsturl ne '') || ($extras ne '')) {
872: $extras .= ':retry';
873: $token = &Apache::lonnet::reply('tmpput:'.&escape($firsturl).
874: $extras,$lonhost);
875: if (($token eq 'con_lost') || ($token eq 'no_such_host')) {
876: return 'fail';
877: } else {
878: if (ref($querystr)) {
879: $$querystr = 'retry='.$token;
880: }
881: return 'ok';
882: }
883: }
884: }
885: return;
886: }
887:
888: sub check_can_host {
889: my ($r,$form,$authhost,$domdesc) = @_;
890: return unless (ref($form) eq 'HASH');
891: my $canhost = 1;
892: my $lonhost = $r->dir_config('lonHostID');
893: my $udom = $form->{'udom'};
894: my @intdoms;
895: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
896: if (ref($internet_names) eq 'ARRAY') {
897: @intdoms = @{$internet_names};
898: }
899: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
900: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
901: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
902: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
903: my $hostname = &Apache::lonnet::hostname($lonhost);
904: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
905: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
906: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
907: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
908: my $loncaparev;
909: if ($authhost eq 'no_account_on_host') {
910: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
911: } else {
912: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
913: }
914: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
915: $udomdefaults{'remotesessions'},
916: $defdomdefaults{'hostedsessions'});
917: }
918: unless ($canhost) {
919: if ($authhost eq 'no_account_on_host') {
920: my $checkloginvia = 1;
921: my ($login_host,$hostname) =
922: &Apache::lonnet::choose_server($udom,$checkloginvia);
923: &Apache::loncommon::content_type($r,'text/html');
924: $r->send_http_header;
925: if ($login_host ne '') {
926: my $protocol = $Apache::lonnet::protocol{$login_host};
927: $protocol = 'http' if ($protocol ne 'https');
928: my $alias = &Apache::lonnet::use_proxy_alias($r,$login_host);
929: $hostname = $alias if ($alias ne '');
930: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
931: #FIXME Should preserve where user was going and linkprot by setting ltoken at $login_host
932: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
933: '<h3>'.&mt('Account creation').'</h3>'.
934: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
935: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
936: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
937: &Apache::loncommon::end_page());
938: } else {
939: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
940: '<h3>'.&mt('Account creation unavailable').'</h3>'.
941: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
942: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
943: &Apache::loncommon::end_page());
944: }
945: } else {
946: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
947: $form);
948: if ($form->{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
949: $env{'request.deeplink.login'} = $form->{'firsturl'};
950: }
951: if ($form->{'linkprot'}) {
952: $env{'request.linkprot'} = $form->{'linkprot'};
953: } elsif ($form->{'linkkey'} ne '') {
954: $env{'request.linkkey'} = $form->{'linkkey'};
955: }
956: my ($otherserver) = &Apache::lonnet::choose_server($udom);
957: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
958: }
959: }
960: return $canhost;
961: }
962:
963: sub noswitch {
964: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
965: '<h3>'.&mt('Session unavailable').'</h3>'.
966: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
967: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
968: &Apache::loncommon::end_page();
969: return $result;
970: }
971:
972: sub loginhelpdisplay {
973: my ($authdomain) = @_;
974: my $login_help = 1;
975: my $lang = &Apache::lonlocal::current_language();
976: if ($login_help) {
977: my $dom = $authdomain;
978: if ($dom eq '') {
979: $dom = &Apache::lonnet::default_login_domain();
980: }
981: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
982: my $loginhelp_url;
983: if ($lang) {
984: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
985: if ($loginhelp_url ne '') {
986: return $loginhelp_url;
987: }
988: }
989: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
990: if ($loginhelp_url ne '') {
991: return $loginhelp_url;
992: } else {
993: return '/adm/loginproblems.html';
994: }
995: }
996: return;
997: }
998:
999: 1;
1000: __END__
1001:
1002:
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