1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.101.8.7 2011/09/27 20:18:45 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;
33: use Apache::Constants qw(:common);
34: use CGI qw(:standard);
35: use DynaLoader; # for Crypt::DES version
36: use Crypt::DES;
37: use Apache::loncommon();
38: use Apache::lonnet;
39: use Apache::lonmenu();
40: use Apache::createaccount;
41: use Fcntl qw(:flock);
42: use Apache::lonlocal;
43: use HTML::Entities;
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 cookie ready
75: $cookie="lonID=$cookie; path=/";
76: # -------------------------------------------------------- Menu script and info
77: my $destination = $lowerurl;
78:
79: if (defined($form->{role})) {
80: my $envkey = 'user.role.'.$form->{role};
81: my $now=time;
82: my $then=$env{'user.login.time'};
83: my $refresh=$env{'user.refresh.time'};
84: if (exists($env{$envkey})) {
85: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
86: &Apache::lonnet::role_status($envkey,$then,$refresh,$now,\$role,\$where,
87: \$trolecode,\$tstatus,\$tstart,\$tend);
88: if ($tstatus eq 'is') {
89: $destination .= ($destination =~ /\?/) ? '&' : '?';
90: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
91: $destination .= 'selectrole=1&'.$newrole.'=1';
92: }
93: }
94: }
95: if (defined($form->{symb})) {
96: my $destsymb = $form->{symb};
97: $destination .= ($destination =~ /\?/) ? '&' : '?';
98: if ($destsymb =~ /___/) {
99: # FIXME Need to deal with encrypted symbs and urls as needed.
100: my ($map,$resid,$desturl)=split(/___/,$destsymb);
101: unless ($desturl=~/^(adm|uploaded|editupload|public)/) {
102: $desturl = &Apache::lonnet::clutter($desturl);
103: }
104: $desturl = &HTML::Entities::encode($desturl,'"<>&');
105: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
106: $destination .= '&destinationurl='.$desturl.
107: '&destsymb='.$destsymb;
108: } else {
109: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
110: $destination .= '&destinationurl='.$destsymb;
111: }
112: }
113:
114: my $windowinfo=&Apache::lonmenu::open($env{'browser.os'});
115: my $startupremote=&Apache::lonmenu::startupremote($destination);
116: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
117: my $setflags=&Apache::lonmenu::setflags();
118: my $maincall=&Apache::lonmenu::maincall();
119: my $brcrum = [{'href' => '',
120: 'text' => 'Successful Login'},];
121: my $start_page=&Apache::loncommon::start_page('Successful Login',
122: $startupremote,
123: {'no_inline_link' => 1,
124: 'bread_crumbs' => $brcrum,});
125: my $end_page =&Apache::loncommon::end_page();
126:
127: my $continuelink;
128: if ($env{'environment.remote'} eq 'off') {
129: $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
130: }
131: # ------------------------------------------------- Output for successful login
132:
133: &Apache::loncommon::content_type($r,'text/html');
134: $r->header_out('Set-cookie' => $cookie);
135: $r->send_http_header;
136:
137: my %lt=&Apache::lonlocal::texthash(
138: 'wel' => 'Welcome',
139: 'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up.',
140: 'pro' => 'Login problems?',
141: 'log' => 'loginproblems.html',
142: );
143: $r->print(<<ENDSUCCESS);
144: $start_page
145: $setflags
146: $windowinfo
147: <h1>$lt{'wel'}</h1>
148: $lt{'mes'}<p>
149: <a href="/adm/$lt{'log'}">$lt{'pro'}</a></p>
150: $remoteinfo
151: $maincall
152: $continuelink
153: $end_page
154: ENDSUCCESS
155: }
156:
157: # --------------------------------------------------------------- Failed login!
158:
159: sub failed {
160: my ($r,$message,$form) = @_;
161: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,
162: {'no_inline_link' => 1,});
163: my $retry = '/adm/login?username='.$form->{'uname'}.
164: '&domain='.$form->{'udom'};
165: if (exists($form->{role})) {
166: $retry .= '&role='.$form->{role};
167: }
168: if (exists($form->{symb})) {
169: $retry .= '&symb='.$form->{symb};
170: }
171: my $end_page = &Apache::loncommon::end_page();
172: &Apache::loncommon::content_type($r,'text/html');
173: $r->send_http_header;
174: $r->print(
175: $start_page
176: .'<h1>'.&mt('Sorry ...').'</h1>'
177: .'<p class="LC_warning">'.&mt($message).'</p>'
178: .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>')
179: .'</p>'
180: .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'
181: .$end_page
182: );
183: }
184:
185: # ------------------------------------------------------------------ Rerouting!
186:
187: sub reroute {
188: my ($r) = @_;
189: &Apache::loncommon::content_type($r,'text/html');
190: $r->send_http_header;
191: my $msg='<h1>'.&mt('Sorry ...').'</h1>'
192: .&mt('Please [_1]log in again[_2].');
193: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
194: }
195:
196: # ---------------------------------------------------------------- Main handler
197:
198: sub handler {
199: my $r = shift;
200: my $form;
201: # Are we re-routing?
202: if (-e '/home/httpd/html/lon-status/reroute.txt') {
203: &reroute($r);
204: return OK;
205: }
206:
207: &Apache::lonlocal::get_language_handle($r);
208:
209: # -------------------------------- Prevent users from attempting to login twice
210: my $handle = &Apache::lonnet::check_for_valid_session($r);
211: if ($handle ne '') {
212: my $lonidsdir=$r->dir_config('lonIDsDir');
213: if ($handle=~/^publicuser\_/) {
214: # For "public user" - remove it, we apparently really want to login
215: unlink($r->dir_config('lonIDsDir')."/$handle.id");
216: } else {
217: # Indeed, a valid token is found
218: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
219: &Apache::loncommon::content_type($r,'text/html');
220: $r->send_http_header;
221: my $start_page =
222: &Apache::loncommon::start_page('Already logged in');
223: my $end_page =
224: &Apache::loncommon::end_page();
225: my $dest = '/adm/roles';
226: if ($env{'form.firsturl'} ne '') {
227: $dest = $env{'form.firsturl'};
228: }
229: $r->print(
230: $start_page
231: .'<h1>'.&mt('You are already logged in!').'</h1>'
232: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
233: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
234: .'</p>'
235: .$end_page
236: );
237: return OK;
238: }
239: }
240:
241: # ---------------------------------------------------- No valid token, continue
242:
243:
244: my $buffer;
245: if ($r->header_in('Content-length') > 0) {
246: $r->read($buffer,$r->header_in('Content-length'),0);
247: }
248: my %form;
249: foreach my $pair (split(/&/,$buffer)) {
250: my ($name,$value) = split(/=/,$pair);
251: $value =~ tr/+/ /;
252: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
253: $form{$name}=$value;
254: }
255:
256: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
257: &failed($r,'Username, password and domain need to be specified.',
258: \%form);
259: return OK;
260: }
261:
262: # split user logging in and "su"-user
263:
264: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
265: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
266: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
267: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
268:
269: my $role = $r->dir_config('lonRole');
270: my $domain = $r->dir_config('lonDefDomain');
271: my $prodir = $r->dir_config('lonUsersDir');
272: my $contact_name = &mt('LON-CAPA helpdesk');
273:
274: # ---------------------------------------- Get the information from login token
275:
276: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
277: $form{'serverid'});
278:
279: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
280: ($tmpinfo eq 'no_such_host')) {
281: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
282: return OK;
283: } else {
284: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
285: $form{'serverid'});
286: if ( $reply ne 'ok' ) {
287: &failed($r,'Session could not be opened.',\%form);
288: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
289: return OK;
290: }
291: }
292:
293: if (!&Apache::lonnet::domain($form{'udom'})) {
294: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
295: return OK;
296: }
297:
298: my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
299: if ($rolestr) {
300: $rolestr = &unescape($rolestr);
301: }
302: if ($symbstr) {
303: $symbstr= &unescape($symbstr);
304: }
305: if ($rolestr =~ /^role=/) {
306: (undef,$form{'role'}) = split('=',$rolestr);
307: }
308: if ($symbstr =~ /^symb=/) {
309: (undef,$form{'symb'}) = split('=',$symbstr);
310: }
311:
312: my $keybin=pack("H16",$key);
313:
314: my $cipher;
315: if ($Crypt::DES::VERSION>=2.03) {
316: $cipher=new Crypt::DES $keybin;
317: }
318: else {
319: $cipher=new DES $keybin;
320: }
321: my $upass='';
322: for (my $i=0;$i<=2;$i++) {
323: my $chunk=
324: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
325:
326: $chunk.=
327: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
328:
329: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
330: $upass.=$chunk;
331: }
332:
333: # ---------------------------------------------------------------- Authenticate
334: my @cancreate;
335: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
336: if (ref($domconfig{'usercreation'}) eq 'HASH') {
337: if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') {
338: if (ref($domconfig{'usercreation'}{'cancreate'}{'selfcreate'}) eq 'ARRAY') {
339: @cancreate = @{$domconfig{'usercreation'}{'cancreate'}{'selfcreate'}};
340: } elsif (($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') &&
341: ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne '')) {
342: @cancreate = ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'});
343: }
344: }
345: }
346: my $defaultauth;
347: if (grep(/^login$/,@cancreate)) {
348: $defaultauth = 1;
349: }
350: my $clientcancheckhost = 1;
351: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
352: $form{'udom'},$defaultauth,
353: $clientcancheckhost);
354:
355: # --------------------------------------------------------------------- Failed?
356:
357: if ($authhost eq 'no_host') {
358: &failed($r,'Username and/or password could not be authenticated.',
359: \%form);
360: return OK;
361: } elsif ($authhost eq 'no_account_on_host') {
362: my %domconfig =
363: &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
364: if (grep(/^login$/,@cancreate)) {
365: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
366: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
367: return OK;
368: }
369: my $start_page =
370: &Apache::loncommon::start_page('Create a user account in LON-CAPA',
371: '',{'no_inline_link' => 1,});
372: my $lonhost = $r->dir_config('lonHostID');
373: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
374: my $contacts =
375: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
376: $form{'udom'},$origmail);
377: my ($contact_email) = split(',',$contacts);
378: my $output = &Apache::createaccount::username_check($form{'uname'},
379: $form{'udom'},$domdesc,'',
380: $lonhost,$contact_email,$contact_name);
381: &Apache::loncommon::content_type($r,'text/html');
382: $r->send_http_header;
383: &Apache::createaccount::print_header($r,$start_page);
384: $r->print('<h3>'.&mt('Account creation').'</h3>'.
385: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
386: $output.&Apache::loncommon::end_page());
387: return OK;
388: } else {
389: &failed($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);
390: return OK;
391: }
392: }
393:
394: if (($firsturl eq '') ||
395: ($firsturl=~/^\/adm\/(logout|remote)/)) {
396: $firsturl='/adm/roles';
397: }
398: # --------------------------------- Are we attempting to login as somebody else?
399: if ($form{'suname'}) {
400: # ------------ see if the original user has enough privileges to pull this stunt
401: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
402: # ---------------------------------------------------- see if the su-user exists
403: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
404: eq 'no_host') {
405: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
406: # ------------------------------ see if the su-user is not too highly privileged
407: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
408: # -------------------------------------------------------- actually switch users
409: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
410: ' logging in as '.$form{'suname'});
411: $form{'uname'}=$form{'suname'};
412: } else {
413: &Apache::lonnet::logthis('Attempted switch user to privileged user');
414: }
415: }
416: } else {
417: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
418: }
419: }
420:
421: if ($r->dir_config("lonBalancer") eq 'yes') {
422: my $otherserver = &Apache::lonnet::spareserver(30000,undef,1,$form{'udom'});
423: if (!$otherserver) {
424: ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
425: }
426: if ($otherserver) {
427: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
428: \%form);
429: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
430: } else {
431: $r->print(&noswitch());
432: }
433: return OK;
434: } else {
435: if (!&check_can_host($r,\%form,$authhost)) {
436: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
437: if ($otherserver) {
438: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
439: \%form);
440: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
441: } else {
442: $r->print(&noswitch());
443: }
444: return OK;
445: }
446: # ------------------------------------------------------- Do the load balancing
447:
448: # ---------------------------------------------------------- Determine own load
449: my $loadlim = $r->dir_config('lonLoadLim');
450: my $loadavg;
451: {
452: my $loadfile=Apache::File->new('/proc/loadavg');
453: $loadavg=<$loadfile>;
454: }
455: $loadavg =~ s/\s.*//g;
456: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
457: my $userloadpercent=&Apache::lonnet::userload();
458:
459: # ---------------------------------------------------------- Are we overloaded?
460: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
461: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
462: if (!$unloaded) {
463: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
464: }
465: if ($unloaded) {
466: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
467: undef,\%form);
468: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
469: return OK;
470: }
471: }
472: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
473: \%form);
474: return OK;
475: }
476: }
477:
478: sub check_can_host {
479: my ($r,$form,$authhost,$domdesc) = @_;
480: return unless (ref($form) eq 'HASH');
481: my $canhost = 1;
482: my $lonhost = $r->dir_config('lonHostID');
483: my $udom = $form->{'udom'};
484: my @intdoms;
485: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
486: if (ref($internet_names) eq 'ARRAY') {
487: @intdoms = @{$internet_names};
488: }
489: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
490: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
491: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
492: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
493: my $hostname = &Apache::lonnet::hostname($lonhost);
494: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
495: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
496: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
497: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
498: my $loncaparev;
499: if ($authhost eq 'no_account_on_host') {
500: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
501: } else {
502: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
503: }
504: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
505: $udomdefaults{'remotesessions'},
506: $defdomdefaults{'hostedsessions'});
507: }
508: unless ($canhost) {
509: if ($authhost eq 'no_account_on_host') {
510: my $checkloginvia = 1;
511: my ($login_host,$hostname) =
512: &Apache::lonnet::choose_server($udom,$checkloginvia);
513: &Apache::loncommon::content_type($r,'text/html');
514: $r->send_http_header;
515: if ($login_host ne '') {
516: my $protocol = $Apache::lonnet::protocol{$login_host};
517: $protocol = 'http' if ($protocol ne 'https');
518: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
519: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
520: '<h3>'.&mt('Account creation').'</h3>'.
521: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
522: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
523: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
524: &Apache::loncommon::end_page());
525: } else {
526: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
527: '<h3>'.&mt('Account creation unavailable').'</h3>'.
528: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
529: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
530: &Apache::loncommon::end_page());
531: }
532: } else {
533: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
534: $form);
535: my ($otherserver) = &Apache::lonnet::choose_server($udom);
536: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
537: }
538: }
539: return $canhost;
540: }
541:
542: sub noswitch {
543: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
544: '<h3>'.&mt('Session unavailable').'</h3>'.
545: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
546: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
547: &Apache::loncommon::end_page();
548: return $result;
549: }
550:
551: 1;
552: __END__
553:
554:
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