1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.163 2021/05/04 18:47:37 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,$cid) = @_;
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 $ip");
66:
67: # ------------------------------------------------- Check for critical messages
68:
69: unless ($skipcritical) {
70: my @what=&Apache::lonnet::dump('critical',$domain,$username);
71: if ($what[0]) {
72: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
73: $lowerurl='/adm/email?critical=display';
74: }
75: }
76: }
77:
78: # ----------------------------------------------------------- Get cookies ready
79: my ($securecookie,$defaultcookie);
80: my $ssl = $r->subprocess_env('https');
81: if ($ssl) {
82: $securecookie="lonSID=$cookie; path=/; HttpOnly; secure";
83: my $lonidsdir=$r->dir_config('lonIDsDir');
84: if (($lonidsdir) && (-e "$lonidsdir/$cookie.id")) {
85: my $linkname=substr(Digest::MD5::md5_hex(Digest::MD5::md5_hex(time(). {}. rand(). $$)), 0, 32).'_linked';
86: if (-e "$lonidsdir/$linkname.id") {
87: unlink("$lonidsdir/$linkname.id");
88: }
89: my $made_symlink = eval { symlink("$lonidsdir/$cookie.id",
90: "$lonidsdir/$linkname.id"); 1 };
91: if ($made_symlink) {
92: $defaultcookie = "lonLinkID=$linkname; path=/; HttpOnly;";
93: &Apache::lonnet::appenv({'user.linkedenv' => $linkname});
94: }
95: }
96: } else {
97: $defaultcookie = "lonID=$cookie; path=/; HttpOnly;";
98: }
99: # -------------------------------------------------------- Menu script and info
100: my $destination = $lowerurl;
101: if ($env{'request.lti.login'}) {
102: if (($env{'request.lti.reqcrs'}) && ($env{'request.lti.reqrole'} eq 'cc')) {
103: &Apache::loncommon::content_type($r,'text/html');
104: if ($securecookie) {
105: $r->headers_out->add('Set-cookie' => $securecookie);
106: }
107: if ($defaultcookie) {
108: $r->headers_out->add('Set-cookie' => $defaultcookie);
109: }
110: $r->send_http_header;
111: if (ref($form) eq 'HASH') {
112: $form->{'lti.login'} = $env{'request.lti.login'};
113: $form->{'lti.reqcrs'} = $env{'request.lti.reqcrs'};
114: $form->{'lti.reqrole'} = $env{'request.lti.reqrole'};
115: $form->{'lti.sourcecrs'} = $env{'request.lti.sourcecrs'};
116: }
117: &Apache::ltiauth::lti_reqcrs($r,$domain,$form,$username,$domain);
118: return;
119: }
120: if ($env{'request.lti.selfenrollrole'}) {
121: if (&Apache::ltiauth::lti_enroll($username,$domain,
122: $env{'request.lti.selfenrollrole'}) eq 'ok') {
123: $form->{'role'} = $env{'request.lti.selfenrollrole'};
124: &Apache::lonnet::delenv('request.lti.selfenrollrole');
125: } else {
126: &Apache::ltiauth::invalid_request($r,24);
127: }
128: }
129: }
130: if (defined($form->{role})) {
131: my $envkey = 'user.role.'.$form->{role};
132: my $now=time;
133: my $then=$env{'user.login.time'};
134: my $refresh=$env{'user.refresh.time'};
135: my $update=$env{'user.update.time'};
136: if (!$update) {
137: $update = $then;
138: }
139: if (exists($env{$envkey})) {
140: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
141: &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
142: \$trolecode,\$tstatus,\$tstart,\$tend);
143: if ($tstatus eq 'is') {
144: $destination .= ($destination =~ /\?/) ? '&' : '?';
145: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
146: $destination .= 'selectrole=1&'.$newrole.'=1';
147: }
148: }
149: }
150: if (defined($form->{symb})) {
151: my $destsymb = $form->{symb};
152: my $encrypted;
153: if ($destsymb =~ m{^/enc/}) {
154: $encrypted = 1;
155: if ($cid) {
156: $destsymb = &Apache::lonenc::unencrypted($destsymb,$cid);
157: }
158: }
159: $destination .= ($destination =~ /\?/) ? '&' : '?';
160: if ($destsymb =~ /___/) {
161: my ($map,$resid,$desturl)=split(/___/,$destsymb);
162: $desturl = &Apache::lonnet::clutter($desturl);
163: if ($encrypted) {
164: $desturl = &Apache::lonenc::encrypted($desturl,1,$cid);
165: $destsymb = $form->{symb};
166: }
167: $desturl = &HTML::Entities::encode($desturl,'"<>&');
168: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
169: $destination .= 'destinationurl='.$desturl.
170: '&destsymb='.$destsymb;
171: } elsif (!$encrypted) {
172: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
173: $destination .= 'destinationurl='.$destsymb;
174: }
175: }
176: if ($destination =~ m{^/adm/roles}) {
177: $destination .= ($destination =~ /\?/) ? '&' : '?';
178: $destination .= 'source=login';
179: }
180:
181: my $windowname = 'loncapaclient';
182: if ($env{'request.lti.login'}) {
183: $windowname .= 'lti';
184: }
185: my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="'.$windowname.'";');
186: my $brcrum = [{'href' => '',
187: 'text' => 'Successful Login'},];
188: my $args = {'bread_crumbs' => $brcrum,};
189: unless ((defined($form->{role})) || (defined($form->{symb}))) {
190: my $update=$env{'user.update.time'};
191: if (!$update) {
192: $update = $env{'user.login.time'};
193: }
194: my %roles_in_env;
195: my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
196: if ($showcount == 1) {
197: foreach my $rolecode (keys(%roles_in_env)) {
198: my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
199: if ($cid) {
200: my %coursedescription =
201: &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
202: if ($coursedescription{'type'} eq 'Placement') {
203: $args->{'crstype'} = 'Placement';
204: }
205: last;
206: }
207: }
208: }
209: }
210:
211: # ------------------------------------------------- Output for successful login
212:
213: &Apache::loncommon::content_type($r,'text/html');
214: if ($securecookie) {
215: $r->headers_out->add('Set-cookie' => $securecookie);
216: }
217: if ($defaultcookie) {
218: $r->headers_out->add('Set-cookie' => $defaultcookie);
219: }
220: $r->send_http_header;
221:
222: my ($start_page,$js,$pagebody,$end_page);
223: if ($env{'request.lti.login'}) {
224: $args = {'only_body' => 1};
225: if ($env{'request.lti.target'} eq '') {
226: my $ltitarget = (($destination =~ /\?/) ? '&' : '?').
227: 'ltitarget=iframe';
228: $js = <<"ENDJS";
229:
230: <script type="text/javascript">
231: // <![CDATA[
232: function setLTItarget() {
233: var newloc = '$destination';
234: if (parent !== window) {
235: newloc += '$ltitarget';
236: }
237: window.location.href=newloc;
238: }
239: // ]]>
240: </script>
241:
242: ENDJS
243: $args->{'add_entries'} = {'onload' => "javascript:setLTItarget();"};
244: $pagebody = '<noscript><span class="LC_warning">'
245: .&mt('Use of LON-CAPA requires Javascript to be enabled in your web browser.')
246: .'</span></noscript>';
247: } else {
248: $args->{'redirect'} = [0,$destination,1];
249: }
250: $start_page=&Apache::loncommon::start_page('',$js,$args);
251: } else {
252: $args->{'redirect'} = [0,$destination];
253: $start_page=&Apache::loncommon::start_page('Successful Login',
254: $js,$args);
255:
256: my %lt=&Apache::lonlocal::texthash(
257: 'wel' => 'Welcome',
258: 'pro' => 'Login problems?',
259: );
260: $pagebody = "<h1>$lt{'wel'}</h1>\n".
261: &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
262: my $loginhelp = &loginhelpdisplay($domain);
263: if ($loginhelp) {
264: $pagebody .= '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
265: }
266: }
267: $end_page = &Apache::loncommon::end_page();
268: $r->print(<<ENDSUCCESS);
269: $start_page
270: $windowinfo
271: $pagebody
272: $end_page
273: ENDSUCCESS
274: return;
275: }
276:
277: # --------------------------------------------------------------- Failed login!
278:
279: sub failed {
280: my ($r,$message,$form) = @_;
281: (undef,undef,undef,my $clientmathml,my $clientunicode) =
282: &Apache::loncommon::decode_user_agent();
283: my $args = {};
284: if ($clientunicode && !$clientmathml) {
285: $args = {'browser.unicode' => 1};
286: }
287:
288: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
289: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
290: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
291: if (&Apache::lonnet::domain($udom,'description') eq '') {
292: undef($udom);
293: }
294: my $retry = '/adm/login';
295: if ($uname eq $form->{'uname'}) {
296: $retry .= '?username='.$uname;
297: }
298: if ($udom) {
299: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
300: }
301: if (exists($form->{role})) {
302: my $role = &Apache::loncommon::cleanup_html($form->{role});
303: if ($role ne '') {
304: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
305: }
306: }
307: if (exists($form->{symb})) {
308: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
309: if ($symb ne '') {
310: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
311: }
312: }
313: if (exists($form->{firsturl})) {
314: my $firsturl = &Apache::loncommon::cleanup_html($form->{firsturl});
315: if ($firsturl ne '') {
316: $retry .= (($retry=~/\?/)?'&':'?').'firsturl='.$firsturl;
317: if ($firsturl =~ m{^/tiny/$match_domain/\w+$}) {
318: unless (exists($form->{linkprot})) {
319: if (exists($form->{linkkey})) {
320: $retry .= 'linkkey='.$form->{linkkey};
321: }
322: }
323: }
324: }
325: }
326: if (exists($form->{linkprot})) {
327: my $ltoken = &Apache::lonnet::tmpput({linkprot => $form->{'linkprot'}},
328: $r->dir_config('lonHostID'));
329: if ($ltoken) {
330: $retry .= (($retry =~ /\?/) ? '&' : '?').'ltoken='.$ltoken;
331: }
332: }
333: my $end_page = &Apache::loncommon::end_page();
334: &Apache::loncommon::content_type($r,'text/html');
335: $r->send_http_header;
336: my @actions =
337: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
338: my $loginhelp = &loginhelpdisplay($udom);
339: if ($loginhelp) {
340: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
341: }
342: #FIXME: link to helpdesk might be added here
343:
344: $r->print(
345: $start_page
346: .'<h2>'.&mt('Sorry ...').'</h2>'
347: .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
348: .&Apache::lonhtmlcommon::actionbox(\@actions)
349: .$end_page
350: );
351: }
352:
353: # ------------------------------------------------------------------ Rerouting!
354:
355: sub reroute {
356: my ($r) = @_;
357: &Apache::loncommon::content_type($r,'text/html');
358: $r->send_http_header;
359: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
360: .&mt('Please [_1]log in again[_2].');
361: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
362: }
363:
364: # ---------------------------------------------------------------- Main handler
365:
366: sub handler {
367: my $r = shift;
368: my $londocroot = $r->dir_config('lonDocRoot');
369: # Are we re-routing?
370: if (-e "$londocroot/lon-status/reroute.txt") {
371: &reroute($r);
372: return OK;
373: }
374:
375: &Apache::lonlocal::get_language_handle($r);
376:
377: # -------------------------------- Prevent users from attempting to login twice
378: my $handle = &Apache::lonnet::check_for_valid_session($r);
379: if ($handle ne '') {
380: my $lonidsdir=$r->dir_config('lonIDsDir');
381: if ($handle=~/^publicuser\_/) {
382: # For "public user" - remove it, we apparently really want to login
383: unlink($r->dir_config('lonIDsDir')."/$handle.id");
384: } else {
385: # Indeed, a valid token is found
386: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
387: &Apache::loncommon::content_type($r,'text/html');
388: $r->send_http_header;
389: my $start_page =
390: &Apache::loncommon::start_page('Already logged in');
391: my $end_page =
392: &Apache::loncommon::end_page();
393: my $dest = '/adm/roles';
394: if ($env{'form.firsturl'} ne '') {
395: $dest = $env{'form.firsturl'};
396: if ($env{'form.firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
397: &Apache::lonnet::appenv({'request.deeplink.login' => $env{'form.firsturl'}});
398: }
399: }
400: $r->print(
401: $start_page
402: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
403: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
404: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
405: .'</p>'
406: .$end_page
407: );
408: return OK;
409: }
410: }
411:
412: # ---------------------------------------------------- No valid token, continue
413:
414:
415: my $buffer;
416: if ($r->header_in('Content-length') > 0) {
417: $r->read($buffer,$r->header_in('Content-length'),0);
418: }
419: my %form;
420: foreach my $pair (split(/&/,$buffer)) {
421: my ($name,$value) = split(/=/,$pair);
422: $value =~ tr/+/ /;
423: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
424: $form{$name}=$value;
425: }
426:
427: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
428: &failed($r,'Username, password and domain need to be specified.',
429: \%form);
430: return OK;
431: }
432:
433: # split user logging in and "su"-user
434:
435: ($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
436: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
437: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
438: $form{'udom'} = &LONCAPA::clean_domain($form{'udom'});
439: $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
440:
441: my $role = $r->dir_config('lonRole');
442: my $domain = $r->dir_config('lonDefDomain');
443: my $prodir = $r->dir_config('lonUsersDir');
444: my $contact_name = &mt('LON-CAPA helpdesk');
445:
446: # ---------------------------------------- Get the information from login token
447:
448: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
449: $form{'serverid'});
450:
451: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
452: ($tmpinfo eq 'no_such_host')) {
453: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
454: return OK;
455: } else {
456: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
457: $form{'serverid'});
458: if ( $reply ne 'ok' ) {
459: &failed($r,'Session could not be opened.',\%form);
460: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
461: return OK;
462: }
463: }
464:
465: if (!&Apache::lonnet::domain($form{'udom'})) {
466: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
467: return OK;
468: }
469:
470: my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr,$linkstr)=split(/&/,$tmpinfo);
471: if ($rolestr) {
472: $rolestr = &unescape($rolestr);
473: }
474: if ($symbstr) {
475: $symbstr= &unescape($symbstr);
476: }
477: if ($iptokenstr) {
478: $iptokenstr = &unescape($iptokenstr);
479: }
480: if ($linkstr) {
481: $linkstr = &unescape($linkstr);
482: }
483: if ($firsturl =~ m{^/tiny/$match_domain/\w+$}) {
484: $form{'firsturl'} = $firsturl;
485: }
486: if ($rolestr =~ /^role=/) {
487: (undef,$form{'role'}) = split('=',$rolestr);
488: }
489: if ($symbstr =~ /^symb=/) {
490: (undef,$form{'symb'}) = split('=',$symbstr);
491: }
492: if ($iptokenstr =~ /^iptoken=/) {
493: (undef,$form{'iptoken'}) = split('=',$iptokenstr);
494: }
495: if ($linkstr =~ /^linkprot=/) {
496: (undef,$form{'linkprot'}) = split('=',$linkstr);
497: } elsif ($linkstr =~ /^linkkey=/) {
498: (undef,$form{'linkkey'}) = split('=',$linkstr);
499: }
500:
501: my $upass = $ENV{HTTPS} ? $form{'upass0'}
502: : &Apache::loncommon::des_decrypt($key,$form{'upass0'});
503:
504: # ---------------------------------------------------------------- Authenticate
505:
506: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
507: my ($cancreate,$statustocreate) =
508: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
509: my $defaultauth;
510: if (ref($cancreate) eq 'ARRAY') {
511: if (grep(/^login$/,@{$cancreate})) {
512: $defaultauth = 1;
513: }
514: }
515: my $clientcancheckhost = 1;
516: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
517: $form{'udom'},$defaultauth,
518: $clientcancheckhost);
519:
520: # --------------------------------------------------------------------- Failed?
521:
522: if ($authhost eq 'no_host') {
523: &failed($r,'Username and/or password could not be authenticated.',
524: \%form);
525: return OK;
526: } elsif ($authhost eq 'no_account_on_host') {
527: if ($defaultauth) {
528: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
529: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
530: return OK;
531: }
532: my $start_page =
533: &Apache::loncommon::start_page('Create a user account in LON-CAPA');
534: my $lonhost = $r->dir_config('lonHostID');
535: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
536: my $contacts =
537: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
538: $form{'udom'},$origmail);
539: my ($contact_email) = split(',',$contacts);
540: my $output =
541: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
542: $domdesc,'',$lonhost,
543: $contact_email,$contact_name,
544: undef,$statustocreate);
545: &Apache::loncommon::content_type($r,'text/html');
546: $r->send_http_header;
547: &Apache::createaccount::print_header($r,$start_page);
548: $r->print('<h3>'.&mt('Account creation').'</h3>'.
549: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
550: $output.&Apache::loncommon::end_page());
551: return OK;
552: } else {
553: &failed($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);
554: return OK;
555: }
556: }
557:
558: if (($firsturl eq '') ||
559: ($firsturl=~/^\/adm\/(logout|remote)/)) {
560: $firsturl='/adm/roles';
561: }
562:
563: my $hosthere;
564: if ($form{'iptoken'}) {
565: my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
566: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
567: if (($sessiondata{'domain'} eq $form{'udom'}) &&
568: ($sessiondata{'username'} eq $form{'uname'})) {
569: $hosthere = 1;
570: }
571: }
572:
573: # --------------------------------- Are we attempting to login as somebody else?
574: if ($form{'suname'}) {
575: my ($suname,$sudom,$sudomref);
576: $suname = $form{'suname'};
577: $sudom = $form{'udom'};
578: if ($form{'sudom'}) {
579: unless ($sudom eq $form{'sudom'}) {
580: if (&Apache::lonnet::domain($form{'sudom'})) {
581: $sudomref = [$form{'sudom'}];
582: $sudom = $form{'sudom'};
583: }
584: }
585: }
586: # ------------ see if the original user has enough privileges to pull this stunt
587: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
588: # ---------------------------------------------------- see if the su-user exists
589: unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
590: # ------------------------------ see if the su-user is not too highly privileged
591: if (&Apache::lonnet::privileged($suname,$sudom)) {
592: &Apache::lonnet::logthis('Attempted switch user to privileged user');
593: } else {
594: my $noprivswitch;
595: #
596: # su-user's home server and user's home server must have one of:
597: # (a) same domain
598: # (b) same primary library server for the two domains
599: # (c) same "internet domain" for primary library server(s) for home servers' domains
600: #
601: my $suprim = &Apache::lonnet::domain($sudom,'primary');
602: my $suintdom = &Apache::lonnet::internet_dom($suprim);
603: unless ($sudom eq $form{'udom'}) {
604: my $uprim = &Apache::lonnet::domain($form{'udom'},'primary');
605: my $uintdom = &Apache::lonnet::internet_dom($uprim);
606: unless ($suprim eq $uprim) {
607: unless ($suintdom eq $uintdom) {
608: &Apache::lonnet::logthis('Attempted switch user '
609: .'to user with different "internet domain".');
610: $noprivswitch = 1;
611: }
612: }
613: }
614:
615: unless ($noprivswitch) {
616: #
617: # server where log-in occurs must have same "internet domain" as su-user's home
618: # server
619: #
620: my $lonhost = $r->dir_config('lonHostID');
621: my $hostintdom = &Apache::lonnet::internet_dom($lonhost);
622: if ($hostintdom ne $suintdom) {
623: &Apache::lonnet::logthis('Attempted switch user on a '
624: .'server with a different "internet domain".');
625: } else {
626:
627: # -------------------------------------------------------- actually switch users
628:
629: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.
630: $form{'udom'}.' logging in as '.$suname.':'.$sudom);
631: $form{'uname'}=$suname;
632: if ($form{'udom'} ne $sudom) {
633: $form{'udom'}=$sudom;
634: }
635: }
636: }
637: }
638: }
639: } else {
640: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
641: }
642: }
643:
644: my ($is_balancer,$otherserver);
645:
646: unless ($hosthere) {
647: ($is_balancer,$otherserver) =
648: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
649: if ($is_balancer) {
650: # Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
651: my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
652: if (($found_server) && ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
653: $otherserver = $found_server;
654: }
655: if ($otherserver eq '') {
656: my $lowest_load;
657: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
658: if ($lowest_load > 100) {
659: $otherserver = &Apache::lonnet::spareserver($r,$lowest_load,$lowest_load,1,$form{'udom'});
660: }
661: }
662: if ($otherserver ne '') {
663: my @hosts = &Apache::lonnet::current_machine_ids();
664: if (grep(/^\Q$otherserver\E$/,@hosts)) {
665: $hosthere = $otherserver;
666: }
667: }
668: }
669: }
670:
671: if (($is_balancer) && (!$hosthere)) {
672: if ($otherserver) {
673: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
674: \%form);
675: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
676: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
677: $switchto .= '&origurl='.$firsturl; #should escape
678: }
679: if ($form{'role'}) {
680: $switchto .= '&role='.$form{'role'};
681: }
682: if ($form{'symb'}) {
683: $switchto .= '&symb='.$form{'symb'};
684: }
685: if ($form{'linkprot'}) {
686: $env{'request.linkprot'} = $form{'linkprot'};
687: } elsif ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
688: if ($form{'linkkey'}) {
689: $env{'request.linkkey'} = $form{'linkkey'};
690: }
691: $env{'request.deeplink.login'} = $form{'firsturl'};
692: }
693: $r->internal_redirect($switchto);
694: } else {
695: &Apache::loncommon::content_type($r,'text/html');
696: $r->send_http_header;
697: $r->print(&noswitch());
698: }
699: return OK;
700: } else {
701: if (!&check_can_host($r,\%form,$authhost)) {
702: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
703: if ($otherserver) {
704: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
705: \%form);
706: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
707: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
708: $switchto .= '&origurl='.$firsturl; #should escape
709: }
710: if ($form{'role'}) {
711: $switchto .= '&role='.$form{'role'};
712: }
713: if ($form{'symb'}) {
714: $switchto .= '&symb='.$form{'symb'};
715: }
716: if ($form{'linkprot'}) {
717: $env{'request.linkprot'} = $form{'linkprot'};
718: } elsif ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
719: if ($form{'linkkey'}) {
720: $env{'request.linkkey'} = $form{'linkkey'};
721: }
722: $env{'request.deeplink.login'} = $form{'firsturl'};
723:
724: }
725: $r->internal_redirect($switchto);
726: } else {
727: &Apache::loncommon::content_type($r,'text/html');
728: $r->send_http_header;
729: $r->print(&noswitch());
730: }
731: return OK;
732: }
733:
734: # ------------------------------------------------------- Do the load balancing
735:
736: # ---------------------------------------------------------- Determine own load
737: my $loadlim = $r->dir_config('lonLoadLim');
738: my $loadavg;
739: {
740: my $loadfile=Apache::File->new('/proc/loadavg');
741: $loadavg=<$loadfile>;
742: }
743: $loadavg =~ s/\s.*//g;
744: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
745: my $userloadpercent=&Apache::lonnet::userload();
746:
747: # ---------------------------------------------------------- Are we overloaded?
748: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
749: my $unloaded=Apache::lonnet::spareserver($r,$loadpercent,$userloadpercent,1,$form{'udom'});
750: if (!$unloaded) {
751: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
752: }
753: if ($unloaded) {
754: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
755: undef,\%form);
756: if ($form{'linkprot'}) {
757: $env{'request.linkprot'} = $form{'linkprot'};
758: } elsif ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
759: if ($form{'linkkey'}) {
760: $env{'request.linkkey'} = $form{'linkkey'};
761: }
762: $env{'request.deeplink.login'} = $form{'firsturl'};
763: }
764: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
765: return OK;
766: }
767: }
768: if (($is_balancer) && ($hosthere)) {
769: $form{'noloadbalance'} = $hosthere;
770: }
771: my $extra_env;
772: if ($form{'linkprot'}) {
773: my ($linkprotector,$uri) = split(/:/,$form{'linkprot'},2);
774: if ($linkprotector) {
775: $extra_env = {'user.linkprotector' => $linkprotector,
776: 'user.linkproturi' => $uri,};
777: }
778: } elsif ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
779: if ($form{'linkkey'}) {
780: $extra_env = {'user.deeplinkkey' => $form{'linkkey'},
781: 'user.keyedlinkuri' => $form{'firsturl'},
782: 'request.deeplink.login' => $form{'firsturl'}};
783: } else {
784: $extra_env = {'request.deeplink.login' => $form{'firsturl'}};
785: }
786: }
787: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,$extra_env,
788: \%form);
789: return OK;
790: }
791: }
792:
793: sub check_can_host {
794: my ($r,$form,$authhost,$domdesc) = @_;
795: return unless (ref($form) eq 'HASH');
796: my $canhost = 1;
797: my $lonhost = $r->dir_config('lonHostID');
798: my $udom = $form->{'udom'};
799: my @intdoms;
800: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
801: if (ref($internet_names) eq 'ARRAY') {
802: @intdoms = @{$internet_names};
803: }
804: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
805: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
806: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
807: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
808: my $hostname = &Apache::lonnet::hostname($lonhost);
809: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
810: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
811: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
812: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
813: my $loncaparev;
814: if ($authhost eq 'no_account_on_host') {
815: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
816: } else {
817: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
818: }
819: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
820: $udomdefaults{'remotesessions'},
821: $defdomdefaults{'hostedsessions'});
822: }
823: unless ($canhost) {
824: if ($authhost eq 'no_account_on_host') {
825: my $checkloginvia = 1;
826: my ($login_host,$hostname) =
827: &Apache::lonnet::choose_server($udom,$checkloginvia);
828: &Apache::loncommon::content_type($r,'text/html');
829: $r->send_http_header;
830: if ($login_host ne '') {
831: my $protocol = $Apache::lonnet::protocol{$login_host};
832: $protocol = 'http' if ($protocol ne 'https');
833: my $alias = &Apache::lonnet::use_proxy_alias($r,$login_host);
834: $hostname = $alias if ($alias ne '');
835: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
836: #FIXME Should preserve where user was going and linkprot by setting ltoken at $login_host
837: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
838: '<h3>'.&mt('Account creation').'</h3>'.
839: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
840: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
841: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
842: &Apache::loncommon::end_page());
843: } else {
844: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
845: '<h3>'.&mt('Account creation unavailable').'</h3>'.
846: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
847: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
848: &Apache::loncommon::end_page());
849: }
850: } else {
851: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
852: $form);
853: if ($form->{'linkprot'}) {
854: $env{'request.linkprot'} = $form->{'linkprot'};
855: } elsif ($form->{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
856: if ($form->{'linkkey'}) {
857: $env{'request.linkkey'} = $form->{'linkkey'};
858: }
859: $env{'request.deeplink.login'} = $form->{'firsturl'};
860: }
861: my ($otherserver) = &Apache::lonnet::choose_server($udom);
862: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
863: }
864: }
865: return $canhost;
866: }
867:
868: sub noswitch {
869: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
870: '<h3>'.&mt('Session unavailable').'</h3>'.
871: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
872: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
873: &Apache::loncommon::end_page();
874: return $result;
875: }
876:
877: sub loginhelpdisplay {
878: my ($authdomain) = @_;
879: my $login_help = 1;
880: my $lang = &Apache::lonlocal::current_language();
881: if ($login_help) {
882: my $dom = $authdomain;
883: if ($dom eq '') {
884: $dom = &Apache::lonnet::default_login_domain();
885: }
886: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
887: my $loginhelp_url;
888: if ($lang) {
889: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
890: if ($loginhelp_url ne '') {
891: return $loginhelp_url;
892: }
893: }
894: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
895: if ($loginhelp_url ne '') {
896: return $loginhelp_url;
897: } else {
898: return '/adm/loginproblems.html';
899: }
900: }
901: return;
902: }
903:
904: 1;
905: __END__
906:
907:
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