1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.120 2011/11/07 18:15:07 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 Apache::File();
44: use HTML::Entities;
45:
46: # ------------------------------------------------------------ Successful login
47: sub success {
48: my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
49: $form) = @_;
50:
51: # ------------------------------------------------------------ Get cookie ready
52: my $cookie =
53: &Apache::loncommon::init_user_environment($r, $username, $domain,
54: $authhost, $form,
55: {'extra_env' => $extra_env,});
56:
57: my $public=($username eq 'public' && $domain eq 'public');
58:
59: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
60:
61: # -------------------------------------------------------------------- Log this
62:
63: &Apache::lonnet::log($domain,$username,$authhost,
64: "Login $ENV{'REMOTE_ADDR'}");
65:
66: # ------------------------------------------------- Check for critical messages
67:
68: my @what=&Apache::lonnet::dump('critical',$domain,$username);
69: if ($what[0]) {
70: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
71: $lowerurl='/adm/email?critical=display';
72: }
73: }
74:
75: # ------------------------------------------------------------ Get cookie ready
76: $cookie="lonID=$cookie; path=/";
77: # -------------------------------------------------------- Menu script and info
78: my $destination = $lowerurl;
79:
80: if (defined($form->{role})) {
81: my $envkey = 'user.role.'.$form->{role};
82: my $now=time;
83: my $then=$env{'user.login.time'};
84: my $refresh=$env{'user.refresh.time'};
85: my $update=$env{'user.update.time'};
86: if (!$update) {
87: $update = $then;
88: }
89: if (exists($env{$envkey})) {
90: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
91: &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
92: \$trolecode,\$tstatus,\$tstart,\$tend);
93: if ($tstatus eq 'is') {
94: $destination .= ($destination =~ /\?/) ? '&' : '?';
95: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
96: $destination .= 'selectrole=1&'.$newrole.'=1';
97: }
98: }
99: }
100: if (defined($form->{symb})) {
101: my $destsymb = $form->{symb};
102: $destination .= ($destination =~ /\?/) ? '&' : '?';
103: if ($destsymb =~ /___/) {
104: # FIXME Need to deal with encrypted symbs and urls as needed.
105: my ($map,$resid,$desturl)=split(/___/,$destsymb);
106: unless ($desturl=~/^(adm|uploaded|editupload|public)/) {
107: $desturl = &Apache::lonnet::clutter($desturl);
108: }
109: $desturl = &HTML::Entities::encode($desturl,'"<>&');
110: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
111: $destination .= '&destinationurl='.$desturl.
112: '&destsymb='.$destsymb;
113: } else {
114: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
115: $destination .= '&destinationurl='.$destsymb;
116: }
117: }
118: if ($destination =~ m{^/adm/roles}) {
119: $destination .= ($destination =~ /\?/) ? '&' : '?';
120: $destination .= 'source=login';
121: }
122:
123: my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
124: my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
125: my $brcrum = [{'href' => '',
126: 'text' => 'Successful Login'},];
127: my $start_page=&Apache::loncommon::start_page('Successful Login',
128: $header,
129: {'bread_crumbs' => $brcrum,});
130: my $end_page =&Apache::loncommon::end_page();
131:
132: my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
133: # ------------------------------------------------- Output for successful login
134:
135: &Apache::loncommon::content_type($r,'text/html');
136: $r->header_out('Set-cookie' => $cookie);
137: $r->send_http_header;
138:
139: my %lt=&Apache::lonlocal::texthash(
140: 'wel' => 'Welcome',
141: 'pro' => 'Login problems?',
142: 'log' => 'loginproblems.html',
143: );
144: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
145: $r->print(<<ENDSUCCESS);
146: $start_page
147: $windowinfo
148: <h1>$lt{'wel'}</h1>
149: $welcome<p>
150: <a href="/adm/$lt{'log'}">$lt{'pro'}</a></p>
151: $continuelink
152: $end_page
153: ENDSUCCESS
154: }
155:
156: # --------------------------------------------------------------- Failed login!
157:
158: sub failed {
159: my ($r,$message,$form) = @_;
160: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef);
161: my $retry = '/adm/login?username='.$form->{'uname'}.
162: '&domain='.$form->{'udom'};
163: if (exists($form->{role})) {
164: $retry .= '&role='.$form->{role};
165: }
166: if (exists($form->{symb})) {
167: $retry .= '&symb='.$form->{symb};
168: }
169: my $end_page = &Apache::loncommon::end_page();
170: &Apache::loncommon::content_type($r,'text/html');
171: $r->send_http_header;
172: $r->print(
173: $start_page
174: .'<h1>'.&mt('Sorry ...').'</h1>'
175: .'<p class="LC_warning">'.&mt($message).'</p>'
176: .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>')
177: .'</p>'
178: .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'
179: .$end_page
180: );
181: }
182:
183: # ------------------------------------------------------------------ Rerouting!
184:
185: sub reroute {
186: my ($r) = @_;
187: &Apache::loncommon::content_type($r,'text/html');
188: $r->send_http_header;
189: my $msg='<h1>'.&mt('Sorry ...').'</h1>'
190: .&mt('Please [_1]log in again[_2].');
191: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
192: }
193:
194: # ---------------------------------------------------------------- Main handler
195:
196: sub handler {
197: my $r = shift;
198: my $londocroot = $r->dir_config('lonDocRoot');
199: my $form;
200: # Are we re-routing?
201: if (-e "$londocroot/lon-status/reroute.txt") {
202: &reroute($r);
203: return OK;
204: }
205:
206: &Apache::lonlocal::get_language_handle($r);
207:
208: # -------------------------------- Prevent users from attempting to login twice
209: my $handle = &Apache::lonnet::check_for_valid_session($r);
210: if ($handle ne '') {
211: my $lonidsdir=$r->dir_config('lonIDsDir');
212: if ($handle=~/^publicuser\_/) {
213: # For "public user" - remove it, we apparently really want to login
214: unlink($r->dir_config('lonIDsDir')."/$handle.id");
215: } else {
216: # Indeed, a valid token is found
217: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
218: &Apache::loncommon::content_type($r,'text/html');
219: $r->send_http_header;
220: my $start_page =
221: &Apache::loncommon::start_page('Already logged in');
222: my $end_page =
223: &Apache::loncommon::end_page();
224: my $dest = '/adm/roles';
225: if ($env{'form.firsturl'} ne '') {
226: $dest = $env{'form.firsturl'};
227: }
228: $r->print(
229: $start_page
230: .'<h1>'.&mt('You are already logged in!').'</h1>'
231: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
232: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
233: .'</p>'
234: .$end_page
235: );
236: return OK;
237: }
238: }
239:
240: # ---------------------------------------------------- No valid token, continue
241:
242:
243: my $buffer;
244: if ($r->header_in('Content-length') > 0) {
245: $r->read($buffer,$r->header_in('Content-length'),0);
246: }
247: my %form;
248: foreach my $pair (split(/&/,$buffer)) {
249: my ($name,$value) = split(/=/,$pair);
250: $value =~ tr/+/ /;
251: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
252: $form{$name}=$value;
253: }
254:
255: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
256: &failed($r,'Username, password and domain need to be specified.',
257: \%form);
258: return OK;
259: }
260:
261: # split user logging in and "su"-user
262:
263: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
264: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
265: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
266: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
267:
268: my $role = $r->dir_config('lonRole');
269: my $domain = $r->dir_config('lonDefDomain');
270: my $prodir = $r->dir_config('lonUsersDir');
271: my $contact_name = &mt('LON-CAPA helpdesk');
272:
273: # ---------------------------------------- Get the information from login token
274:
275: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
276: $form{'serverid'});
277:
278: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
279: ($tmpinfo eq 'no_such_host')) {
280: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
281: return OK;
282: } else {
283: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
284: $form{'serverid'});
285: if ( $reply ne 'ok' ) {
286: &failed($r,'Session could not be opened.',\%form);
287: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
288: return OK;
289: }
290: }
291:
292: if (!&Apache::lonnet::domain($form{'udom'})) {
293: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
294: return OK;
295: }
296:
297: my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
298: if ($rolestr) {
299: $rolestr = &unescape($rolestr);
300: }
301: if ($symbstr) {
302: $symbstr= &unescape($symbstr);
303: }
304: if ($rolestr =~ /^role=/) {
305: (undef,$form{'role'}) = split('=',$rolestr);
306: }
307: if ($symbstr =~ /^symb=/) {
308: (undef,$form{'symb'}) = split('=',$symbstr);
309: }
310:
311: my $keybin=pack("H16",$key);
312:
313: my $cipher;
314: if ($Crypt::DES::VERSION>=2.03) {
315: $cipher=new Crypt::DES $keybin;
316: }
317: else {
318: $cipher=new DES $keybin;
319: }
320: my $upass='';
321: for (my $i=0;$i<=2;$i++) {
322: my $chunk=
323: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
324:
325: $chunk.=
326: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
327:
328: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
329: $upass.=$chunk;
330: }
331:
332: # ---------------------------------------------------------------- Authenticate
333:
334: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
335: my ($cancreate,$statustocreate) =
336: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
337: my $defaultauth;
338: if (ref($cancreate) eq 'ARRAY') {
339: if (grep(/^login$/,@{$cancreate})) {
340: $defaultauth = 1;
341: }
342: }
343: my $clientcancheckhost = 1;
344: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
345: $form{'udom'},$defaultauth,
346: $clientcancheckhost);
347:
348: # --------------------------------------------------------------------- Failed?
349:
350: if ($authhost eq 'no_host') {
351: &failed($r,'Username and/or password could not be authenticated.',
352: \%form);
353: return OK;
354: } elsif ($authhost eq 'no_account_on_host') {
355: if ($defaultauth) {
356: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
357: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
358: return OK;
359: }
360: my $start_page =
361: &Apache::loncommon::start_page('Create a user account in LON-CAPA');
362: my $lonhost = $r->dir_config('lonHostID');
363: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
364: my $contacts =
365: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
366: $form{'udom'},$origmail);
367: my ($contact_email) = split(',',$contacts);
368: my $output =
369: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
370: $domdesc,'',$lonhost,
371: $contact_email,$contact_name,
372: undef,$statustocreate);
373: &Apache::loncommon::content_type($r,'text/html');
374: $r->send_http_header;
375: &Apache::createaccount::print_header($r,$start_page);
376: $r->print('<h3>'.&mt('Account creation').'</h3>'.
377: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
378: $output.&Apache::loncommon::end_page());
379: return OK;
380: } else {
381: &failed($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);
382: return OK;
383: }
384: }
385:
386: if (($firsturl eq '') ||
387: ($firsturl=~/^\/adm\/(logout|remote)/)) {
388: $firsturl='/adm/roles';
389: }
390: # --------------------------------- Are we attempting to login as somebody else?
391: if ($form{'suname'}) {
392: # ------------ see if the original user has enough privileges to pull this stunt
393: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
394: # ---------------------------------------------------- see if the su-user exists
395: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
396: eq 'no_host') {
397: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
398: # ------------------------------ see if the su-user is not too highly privileged
399: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
400: # -------------------------------------------------------- actually switch users
401: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
402: ' logging in as '.$form{'suname'});
403: $form{'uname'}=$form{'suname'};
404: } else {
405: &Apache::lonnet::logthis('Attempted switch user to privileged user');
406: }
407: }
408: } else {
409: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
410: }
411: }
412:
413: my ($is_balancer,$otherserver) =
414: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
415:
416: if ($is_balancer) {
417: if (!$otherserver) {
418: ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
419: }
420: if ($otherserver) {
421: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
422: \%form);
423: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
424: } else {
425: $r->print(&noswitch());
426: }
427: return OK;
428: } else {
429: if (!&check_can_host($r,\%form,$authhost)) {
430: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
431: if ($otherserver) {
432: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
433: \%form);
434: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
435: } else {
436: $r->print(&noswitch());
437: }
438: return OK;
439: }
440:
441: # ------------------------------------------------------- Do the load balancing
442:
443: # ---------------------------------------------------------- Determine own load
444: my $loadlim = $r->dir_config('lonLoadLim');
445: my $loadavg;
446: {
447: my $loadfile=Apache::File->new('/proc/loadavg');
448: $loadavg=<$loadfile>;
449: }
450: $loadavg =~ s/\s.*//g;
451: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
452: my $userloadpercent=&Apache::lonnet::userload();
453:
454: # ---------------------------------------------------------- Are we overloaded?
455: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
456: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
457: if (!$unloaded) {
458: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
459: }
460: if ($unloaded) {
461: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
462: undef,\%form);
463: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
464: return OK;
465: }
466: }
467: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
468: \%form);
469: return OK;
470: }
471: }
472:
473: sub check_can_host {
474: my ($r,$form,$authhost,$domdesc) = @_;
475: return unless (ref($form) eq 'HASH');
476: my $canhost = 1;
477: my $lonhost = $r->dir_config('lonHostID');
478: my $udom = $form->{'udom'};
479: my @intdoms;
480: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
481: if (ref($internet_names) eq 'ARRAY') {
482: @intdoms = @{$internet_names};
483: }
484: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
485: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
486: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
487: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
488: my $hostname = &Apache::lonnet::hostname($lonhost);
489: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
490: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
491: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
492: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
493: my $loncaparev;
494: if ($authhost eq 'no_account_on_host') {
495: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
496: } else {
497: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
498: }
499: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
500: $udomdefaults{'remotesessions'},
501: $defdomdefaults{'hostedsessions'});
502: }
503: unless ($canhost) {
504: if ($authhost eq 'no_account_on_host') {
505: my $checkloginvia = 1;
506: my ($login_host,$hostname) =
507: &Apache::lonnet::choose_server($udom,$checkloginvia);
508: &Apache::loncommon::content_type($r,'text/html');
509: $r->send_http_header;
510: if ($login_host ne '') {
511: my $protocol = $Apache::lonnet::protocol{$login_host};
512: $protocol = 'http' if ($protocol ne 'https');
513: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
514: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
515: '<h3>'.&mt('Account creation').'</h3>'.
516: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
517: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
518: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
519: &Apache::loncommon::end_page());
520: } else {
521: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
522: '<h3>'.&mt('Account creation unavailable').'</h3>'.
523: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
524: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
525: &Apache::loncommon::end_page());
526: }
527: } else {
528: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
529: $form);
530: my ($otherserver) = &Apache::lonnet::choose_server($udom);
531: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
532: }
533: }
534: return $canhost;
535: }
536:
537: sub noswitch {
538: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
539: '<h3>'.&mt('Session unavailable').'</h3>'.
540: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
541: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
542: &Apache::loncommon::end_page();
543: return $result;
544: }
545:
546: 1;
547: __END__
548:
549:
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