1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.124 2012/12/18 20:52:18 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|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: );
143: my $loginhelp = &loginhelpdisplay($domain);
144: if ($loginhelp) {
145: $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
146: }
147:
148: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
149: $r->print(<<ENDSUCCESS);
150: $start_page
151: $windowinfo
152: <h1>$lt{'wel'}</h1>
153: $welcome
154: $loginhelp
155: $continuelink
156: $end_page
157: ENDSUCCESS
158: }
159:
160: # --------------------------------------------------------------- Failed login!
161:
162: sub failed {
163: my ($r,$message,$form) = @_;
164: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef);
165: my $retry = '/adm/login?username='.$form->{'uname'}.
166: '&domain='.$form->{'udom'};
167: if (exists($form->{role})) {
168: $retry .= '&role='.$form->{role};
169: }
170: if (exists($form->{symb})) {
171: $retry .= '&symb='.$form->{symb};
172: }
173: my $end_page = &Apache::loncommon::end_page();
174: &Apache::loncommon::content_type($r,'text/html');
175: $r->send_http_header;
176: my $loginhelp = &loginhelpdisplay($form->{'udom'});
177: if ($loginhelp) {
178: $loginhelp = '<p><a href="'.$loginhelp.'">'.&mt('Login problems?').'</a></p>';
179: }
180:
181: $r->print(
182: $start_page
183: .'<h1>'.&mt('Sorry ...').'</h1>'
184: .'<p class="LC_warning">'.&mt($message).'</p>'
185: .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>')
186: .'</p>'
187: .$loginhelp
188: .$end_page
189: );
190: }
191:
192: # ------------------------------------------------------------------ Rerouting!
193:
194: sub reroute {
195: my ($r) = @_;
196: &Apache::loncommon::content_type($r,'text/html');
197: $r->send_http_header;
198: my $msg='<h1>'.&mt('Sorry ...').'</h1>'
199: .&mt('Please [_1]log in again[_2].');
200: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
201: }
202:
203: # ---------------------------------------------------------------- Main handler
204:
205: sub handler {
206: my $r = shift;
207: my $londocroot = $r->dir_config('lonDocRoot');
208: my $form;
209: # Are we re-routing?
210: if (-e "$londocroot/lon-status/reroute.txt") {
211: &reroute($r);
212: return OK;
213: }
214:
215: &Apache::lonlocal::get_language_handle($r);
216:
217: # -------------------------------- Prevent users from attempting to login twice
218: my $handle = &Apache::lonnet::check_for_valid_session($r);
219: if ($handle ne '') {
220: my $lonidsdir=$r->dir_config('lonIDsDir');
221: if ($handle=~/^publicuser\_/) {
222: # For "public user" - remove it, we apparently really want to login
223: unlink($r->dir_config('lonIDsDir')."/$handle.id");
224: } else {
225: # Indeed, a valid token is found
226: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
227: &Apache::loncommon::content_type($r,'text/html');
228: $r->send_http_header;
229: my $start_page =
230: &Apache::loncommon::start_page('Already logged in');
231: my $end_page =
232: &Apache::loncommon::end_page();
233: my $dest = '/adm/roles';
234: if ($env{'form.firsturl'} ne '') {
235: $dest = $env{'form.firsturl'};
236: }
237: $r->print(
238: $start_page
239: .'<p class="LC_warning>"'.&mt('You are already logged in!').'</p>'
240: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
241: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
242: .'</p>'
243: .$end_page
244: );
245: return OK;
246: }
247: }
248:
249: # ---------------------------------------------------- No valid token, continue
250:
251:
252: my $buffer;
253: if ($r->header_in('Content-length') > 0) {
254: $r->read($buffer,$r->header_in('Content-length'),0);
255: }
256: my %form;
257: foreach my $pair (split(/&/,$buffer)) {
258: my ($name,$value) = split(/=/,$pair);
259: $value =~ tr/+/ /;
260: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
261: $form{$name}=$value;
262: }
263:
264: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
265: &failed($r,'Username, password and domain need to be specified.',
266: \%form);
267: return OK;
268: }
269:
270: # split user logging in and "su"-user
271:
272: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
273: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
274: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
275: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
276:
277: my $role = $r->dir_config('lonRole');
278: my $domain = $r->dir_config('lonDefDomain');
279: my $prodir = $r->dir_config('lonUsersDir');
280: my $contact_name = &mt('LON-CAPA helpdesk');
281:
282: # ---------------------------------------- Get the information from login token
283:
284: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
285: $form{'serverid'});
286:
287: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
288: ($tmpinfo eq 'no_such_host')) {
289: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
290: return OK;
291: } else {
292: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
293: $form{'serverid'});
294: if ( $reply ne 'ok' ) {
295: &failed($r,'Session could not be opened.',\%form);
296: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
297: return OK;
298: }
299: }
300:
301: if (!&Apache::lonnet::domain($form{'udom'})) {
302: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
303: return OK;
304: }
305:
306: my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
307: if ($rolestr) {
308: $rolestr = &unescape($rolestr);
309: }
310: if ($symbstr) {
311: $symbstr= &unescape($symbstr);
312: }
313: if ($rolestr =~ /^role=/) {
314: (undef,$form{'role'}) = split('=',$rolestr);
315: }
316: if ($symbstr =~ /^symb=/) {
317: (undef,$form{'symb'}) = split('=',$symbstr);
318: }
319:
320: my $keybin=pack("H16",$key);
321:
322: my $cipher;
323: if ($Crypt::DES::VERSION>=2.03) {
324: $cipher=new Crypt::DES $keybin;
325: }
326: else {
327: $cipher=new DES $keybin;
328: }
329: my $upass='';
330: for (my $i=0;$i<=2;$i++) {
331: my $chunk=
332: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
333:
334: $chunk.=
335: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
336:
337: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
338: $upass.=$chunk;
339: }
340:
341: # ---------------------------------------------------------------- Authenticate
342:
343: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
344: my ($cancreate,$statustocreate) =
345: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
346: my $defaultauth;
347: if (ref($cancreate) eq 'ARRAY') {
348: if (grep(/^login$/,@{$cancreate})) {
349: $defaultauth = 1;
350: }
351: }
352: my $clientcancheckhost = 1;
353: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
354: $form{'udom'},$defaultauth,
355: $clientcancheckhost);
356:
357: # --------------------------------------------------------------------- Failed?
358:
359: if ($authhost eq 'no_host') {
360: &failed($r,'Username and/or password could not be authenticated.',
361: \%form);
362: return OK;
363: } elsif ($authhost eq 'no_account_on_host') {
364: if ($defaultauth) {
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: my $lonhost = $r->dir_config('lonHostID');
372: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
373: my $contacts =
374: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
375: $form{'udom'},$origmail);
376: my ($contact_email) = split(',',$contacts);
377: my $output =
378: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
379: $domdesc,'',$lonhost,
380: $contact_email,$contact_name,
381: undef,$statustocreate);
382: &Apache::loncommon::content_type($r,'text/html');
383: $r->send_http_header;
384: &Apache::createaccount::print_header($r,$start_page);
385: $r->print('<h3>'.&mt('Account creation').'</h3>'.
386: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
387: $output.&Apache::loncommon::end_page());
388: return OK;
389: } else {
390: &failed($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);
391: return OK;
392: }
393: }
394:
395: if (($firsturl eq '') ||
396: ($firsturl=~/^\/adm\/(logout|remote)/)) {
397: $firsturl='/adm/roles';
398: }
399: # --------------------------------- Are we attempting to login as somebody else?
400: if ($form{'suname'}) {
401: # ------------ see if the original user has enough privileges to pull this stunt
402: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
403: # ---------------------------------------------------- see if the su-user exists
404: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
405: eq 'no_host') {
406: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
407: # ------------------------------ see if the su-user is not too highly privileged
408: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
409: # -------------------------------------------------------- actually switch users
410: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
411: ' logging in as '.$form{'suname'});
412: $form{'uname'}=$form{'suname'};
413: } else {
414: &Apache::lonnet::logthis('Attempted switch user to privileged user');
415: }
416: }
417: } else {
418: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
419: }
420: }
421:
422: my ($is_balancer,$otherserver) =
423: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
424:
425: if ($is_balancer) {
426: if (!$otherserver) {
427: ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
428: }
429: if ($otherserver) {
430: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
431: \%form);
432: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
433: } else {
434: $r->print(&noswitch());
435: }
436: return OK;
437: } else {
438: if (!&check_can_host($r,\%form,$authhost)) {
439: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
440: if ($otherserver) {
441: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
442: \%form);
443: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
444: } else {
445: $r->print(&noswitch());
446: }
447: return OK;
448: }
449:
450: # ------------------------------------------------------- Do the load balancing
451:
452: # ---------------------------------------------------------- Determine own load
453: my $loadlim = $r->dir_config('lonLoadLim');
454: my $loadavg;
455: {
456: my $loadfile=Apache::File->new('/proc/loadavg');
457: $loadavg=<$loadfile>;
458: }
459: $loadavg =~ s/\s.*//g;
460: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
461: my $userloadpercent=&Apache::lonnet::userload();
462:
463: # ---------------------------------------------------------- Are we overloaded?
464: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
465: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
466: if (!$unloaded) {
467: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
468: }
469: if ($unloaded) {
470: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
471: undef,\%form);
472: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
473: return OK;
474: }
475: }
476: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
477: \%form);
478: return OK;
479: }
480: }
481:
482: sub check_can_host {
483: my ($r,$form,$authhost,$domdesc) = @_;
484: return unless (ref($form) eq 'HASH');
485: my $canhost = 1;
486: my $lonhost = $r->dir_config('lonHostID');
487: my $udom = $form->{'udom'};
488: my @intdoms;
489: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
490: if (ref($internet_names) eq 'ARRAY') {
491: @intdoms = @{$internet_names};
492: }
493: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
494: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
495: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
496: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
497: my $hostname = &Apache::lonnet::hostname($lonhost);
498: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
499: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
500: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
501: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
502: my $loncaparev;
503: if ($authhost eq 'no_account_on_host') {
504: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
505: } else {
506: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
507: }
508: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
509: $udomdefaults{'remotesessions'},
510: $defdomdefaults{'hostedsessions'});
511: }
512: unless ($canhost) {
513: if ($authhost eq 'no_account_on_host') {
514: my $checkloginvia = 1;
515: my ($login_host,$hostname) =
516: &Apache::lonnet::choose_server($udom,$checkloginvia);
517: &Apache::loncommon::content_type($r,'text/html');
518: $r->send_http_header;
519: if ($login_host ne '') {
520: my $protocol = $Apache::lonnet::protocol{$login_host};
521: $protocol = 'http' if ($protocol ne 'https');
522: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
523: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
524: '<h3>'.&mt('Account creation').'</h3>'.
525: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
526: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
527: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
528: &Apache::loncommon::end_page());
529: } else {
530: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
531: '<h3>'.&mt('Account creation unavailable').'</h3>'.
532: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
533: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
534: &Apache::loncommon::end_page());
535: }
536: } else {
537: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
538: $form);
539: my ($otherserver) = &Apache::lonnet::choose_server($udom);
540: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
541: }
542: }
543: return $canhost;
544: }
545:
546: sub noswitch {
547: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
548: '<h3>'.&mt('Session unavailable').'</h3>'.
549: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
550: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
551: &Apache::loncommon::end_page();
552: return $result;
553: }
554:
555: sub loginhelpdisplay {
556: my ($authdomain) = @_;
557: my $login_help = 1;
558: my $lang = &Apache::lonlocal::current_language();
559: if ($login_help) {
560: my $dom = $authdomain;
561: if ($dom eq '') {
562: $dom = &Apache::lonnet::default_login_domain();
563: }
564: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
565: my $loginhelp_url;
566: if ($lang) {
567: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
568: if ($loginhelp_url ne '') {
569: return $loginhelp_url;
570: }
571: }
572: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
573: if ($loginhelp_url ne '') {
574: return $loginhelp_url;
575: } else {
576: return '/adm/loginproblems.html';
577: }
578: }
579: return;
580: }
581:
582: 1;
583: __END__
584:
585:
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