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- Backport 1.103.

    1: # The LearningOnline Network
    2: # User Authentication Module
    3: #
    4: # $Id: lonauth.pm,v 1.101.4.2 2010/05/23 21:20:11 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 $start_page=&Apache::loncommon::start_page('Successful Login',
  120:                                                   $startupremote,
  121:                                                   {'no_inline_link' => 1,});
  122:     my $end_page  =&Apache::loncommon::end_page();
  123: 
  124:     my $continuelink;
  125:     if (($env{'browser.interface'} eq 'textual') ||
  126:         ($env{'environment.remote'} eq 'off')) {
  127: 	$continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
  128:     }
  129: # ------------------------------------------------- Output for successful login
  130: 
  131:     &Apache::loncommon::content_type($r,'text/html');
  132:     $r->header_out('Set-cookie' => $cookie);
  133:     $r->send_http_header;
  134: 
  135:     my %lt=&Apache::lonlocal::texthash(
  136: 				       'wel' => 'Welcome',
  137: 				       'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up.',
  138: 				       'pro' => 'Login problems?',
  139: 				       'log' => 'loginproblems.html',
  140: 				       );
  141:     $r->print(<<ENDSUCCESS);
  142: $start_page
  143: $setflags
  144: $windowinfo
  145: <h1>$lt{'wel'}</h1>
  146: $lt{'mes'}<p>
  147: <a href="/adm/$lt{'log'}">$lt{'pro'}</a></p>
  148: $remoteinfo
  149: $maincall
  150: $continuelink
  151: $end_page
  152: ENDSUCCESS
  153: }
  154: 
  155: # --------------------------------------------------------------- Failed login!
  156: 
  157: sub failed {
  158:     my ($r,$message,$form) = @_;
  159:     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,
  160: 						    {'no_inline_link' => 1,});
  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 $form;
  199: # Are we re-routing?
  200:     if (-e '/home/httpd/html/lon-status/reroute.txt') {
  201: 	&reroute($r);
  202: 	return OK;
  203:     }
  204: 
  205:     &Apache::lonlocal::get_language_handle($r);
  206: 
  207: # -------------------------------- Prevent users from attempting to login twice
  208:     my $handle = &Apache::lonnet::check_for_valid_session($r);
  209:     if ($handle ne '') {
  210:         my $lonidsdir=$r->dir_config('lonIDsDir');
  211:         if ($handle=~/^publicuser\_/) {
  212: # For "public user" - remove it, we apparently really want to login
  213:             unlink($r->dir_config('lonIDsDir')."/$handle.id");
  214:         } else {
  215: # Indeed, a valid token is found
  216:             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
  217: 	    &Apache::loncommon::content_type($r,'text/html');
  218: 	    $r->send_http_header;
  219: 	    my $start_page = 
  220: 	        &Apache::loncommon::start_page('Already logged in');
  221: 	    my $end_page = 
  222: 	        &Apache::loncommon::end_page();
  223:             my $dest = '/adm/roles';
  224:             if ($env{'form.firsturl'} ne '') {
  225:                 $dest = $env{'form.firsturl'};
  226:             }
  227:             $r->print(
  228:                 $start_page
  229:                .'<h1>'.&mt('You are already logged in!').'</h1>'
  230:                .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
  231:                         ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
  232:               .'</p>'
  233:               .$end_page
  234:             );
  235:             return OK;
  236:         }
  237:     }
  238: 
  239: # ---------------------------------------------------- No valid token, continue
  240: 
  241: 
  242:     my $buffer;
  243:     if ($r->header_in('Content-length') > 0) {
  244: 	$r->read($buffer,$r->header_in('Content-length'),0);
  245:     }
  246:     my %form;
  247:     foreach my $pair (split(/&/,$buffer)) {
  248:        my ($name,$value) = split(/=/,$pair);
  249:        $value =~ tr/+/ /;
  250:        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
  251:        $form{$name}=$value;
  252:     } 
  253: 
  254:     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
  255: 	&failed($r,'Username, password and domain need to be specified.',
  256: 		\%form);
  257:         return OK;
  258:     }
  259: 
  260: # split user logging in and "su"-user
  261: 
  262:     ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
  263:     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
  264:     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
  265:     $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
  266: 
  267:     my $role   = $r->dir_config('lonRole');
  268:     my $domain = $r->dir_config('lonDefDomain');
  269:     my $prodir = $r->dir_config('lonUsersDir');
  270:     my $contact_name = &mt('LON-CAPA helpdesk');
  271: 
  272: # ---------------------------------------- Get the information from login token
  273: 
  274:     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
  275:                                       $form{'serverid'});
  276: 
  277:     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
  278: 	&failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
  279:         return OK;
  280:     } else {
  281: 	my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
  282: 					   $form{'serverid'});
  283:         if ( $reply ne 'ok' ) {
  284:             &failed($r,'Session could not be opened.',\%form);
  285: 	    &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
  286: 	    return OK;
  287: 	}
  288:     }
  289: 
  290:     if (!&Apache::lonnet::domain($form{'udom'})) {
  291:         &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
  292:         return OK;
  293:     }
  294: 
  295:     my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
  296:     if ($rolestr) {
  297:         $rolestr = &unescape($rolestr);
  298:     }
  299:     if ($symbstr) {
  300:         $symbstr= &unescape($symbstr);
  301:     }
  302:     if ($rolestr =~ /^role=/) {
  303:         (undef,$form{'role'}) = split('=',$rolestr);
  304:     }
  305:     if ($symbstr =~ /^symb=/) { 
  306:         (undef,$form{'symb'}) = split('=',$symbstr);
  307:     }
  308: 
  309:     my $keybin=pack("H16",$key);
  310: 
  311:     my $cipher;
  312:     if ($Crypt::DES::VERSION>=2.03) {
  313: 	$cipher=new Crypt::DES $keybin;
  314:     }
  315:     else {
  316: 	$cipher=new DES $keybin;
  317:     }
  318:     my $upass='';
  319:     for (my $i=0;$i<=2;$i++) {
  320: 	my $chunk=
  321: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
  322: 
  323: 	$chunk.=
  324: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
  325: 
  326: 	$chunk=substr($chunk,1,ord(substr($chunk,0,1)));
  327: 	$upass.=$chunk;
  328:     }
  329: 
  330: # ---------------------------------------------------------------- Authenticate
  331:     my @cancreate;
  332:     my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
  333:     if (ref($domconfig{'usercreation'}) eq 'HASH') {
  334:         if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') {
  335:             if (ref($domconfig{'usercreation'}{'cancreate'}{'selfcreate'}) eq 'ARRAY') {
  336:                 @cancreate = @{$domconfig{'usercreation'}{'cancreate'}{'selfcreate'}};
  337:             } elsif (($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') && 
  338:                      ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne '')) {
  339:                 @cancreate = ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'});
  340:             }
  341:         }
  342:     }
  343:     my $defaultauth;
  344:     if (grep(/^login$/,@cancreate)) {
  345:         $defaultauth = 1;
  346:     }
  347:     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
  348:                                               $form{'udom'},$defaultauth);
  349:     
  350: # --------------------------------------------------------------------- Failed?
  351: 
  352:     if ($authhost eq 'no_host') {
  353: 	&failed($r,'Username and/or password could not be authenticated.',
  354: 		\%form);
  355:         return OK;
  356:     } elsif ($authhost eq 'no_account_on_host') {
  357:         my %domconfig = 
  358:             &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
  359:         if (grep(/^login$/,@cancreate)) {
  360:             my $start_page = 
  361:                 &Apache::loncommon::start_page('Create a user account in LON-CAPA',
  362:                                                '',{'no_inline_link'   => 1,});
  363:             my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
  364:             my $lonhost = $r->dir_config('lonHostID');
  365:             my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
  366:             my $contacts = 
  367:                 &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
  368:                                                         $form{'udom'},$origmail);
  369:             my ($contact_email) = split(',',$contacts); 
  370:             my $output = &Apache::createaccount::username_check($form{'uname'}, 
  371:                                                                 $form{'udom'},$domdesc,'',
  372:                                                                 $lonhost,$contact_email,$contact_name);
  373:             &Apache::loncommon::content_type($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:     if ($r->dir_config("lonBalancer") eq 'yes') {
  414: 	&success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
  415: 		 \%form);
  416: 	$r->internal_redirect('/adm/switchserver');
  417:     } else {
  418: 	&success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
  419: 		 \%form);
  420:     }
  421:     return OK;
  422: }
  423: 
  424: 1;
  425: __END__
  426: 
  427: