Annotation of loncom/auth/lonauth.pm, revision 1.135

1.1       albertel    1: # The LearningOnline Network
                      2: # User Authentication Module
1.27      www         3: #
1.135   ! raeburn     4: # $Id: lonauth.pm,v 1.134 2014/04/30 21:51:30 raeburn Exp $
1.27      www         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: #
1.1       albertel   28: 
                     29: package Apache::lonauth;
                     30: 
1.18      albertel   31: use strict;
1.78      albertel   32: use LONCAPA;
1.1       albertel   33: use Apache::Constants qw(:common);
                     34: use CGI qw(:standard);
1.26      harris41   35: use DynaLoader; # for Crypt::DES version
1.8       www        36: use Crypt::DES;
1.45      matthew    37: use Apache::loncommon();
1.66      albertel   38: use Apache::lonnet;
1.12      www        39: use Apache::lonmenu();
1.90      raeburn    40: use Apache::createaccount;
1.18      albertel   41: use Fcntl qw(:flock);
1.56      www        42: use Apache::lonlocal;
1.119     raeburn    43: use Apache::File();
1.101     raeburn    44: use HTML::Entities;
1.85      albertel   45:  
1.1       albertel   46: # ------------------------------------------------------------ Successful login
1.85      albertel   47: sub success {
                     48:     my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
                     49: 	$form) = @_;
1.1       albertel   50: 
1.85      albertel   51: # ------------------------------------------------------------ Get cookie ready
                     52:     my $cookie =
                     53: 	&Apache::loncommon::init_user_environment($r, $username, $domain,
                     54: 						  $authhost, $form,
1.86      albertel   55: 						  {'extra_env' => $extra_env,});
1.4       www        56: 
1.69      albertel   57:     my $public=($username eq 'public' && $domain eq 'public');
                     58: 
1.85      albertel   59:     if ($public or $lowerurl eq 'noredirect') { return $cookie; }
1.78      albertel   60: 
1.7       www        61: # -------------------------------------------------------------------- Log this
                     62: 
                     63:     &Apache::lonnet::log($domain,$username,$authhost,
                     64:                          "Login $ENV{'REMOTE_ADDR'}");
1.4       www        65: 
1.14      www        66: # ------------------------------------------------- Check for critical messages
                     67: 
1.21      www        68:     my @what=&Apache::lonnet::dump('critical',$domain,$username);
1.14      www        69:     if ($what[0]) {
1.22      www        70: 	if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
1.21      www        71: 	    $lowerurl='/adm/email?critical=display';
1.14      www        72:         }
                     73:     }
                     74: 
1.5       www        75: # ------------------------------------------------------------ Get cookie ready
1.1       albertel   76:     $cookie="lonID=$cookie; path=/";
1.12      www        77: # -------------------------------------------------------- Menu script and info
1.100     raeburn    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'};
1.111     raeburn    85:         my $update=$env{'user.update.time'};
                     86:         if (!$update) {
                     87:             $update = $then;
                     88:         }
1.100     raeburn    89:         if (exists($env{$envkey})) {
                     90:             my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
1.111     raeburn    91:             &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
1.100     raeburn    92:                                          \$trolecode,\$tstatus,\$tstart,\$tend);
                     93:             if ($tstatus eq 'is') {
1.101     raeburn    94:                 $destination  .= ($destination =~ /\?/) ? '&' : '?';
                     95:                 my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
                     96:                 $destination .= 'selectrole=1&'.$newrole.'=1';
1.100     raeburn    97:             }
                     98:         }
                     99:     }
1.101     raeburn   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(/___/,$destsymb);
1.124     raeburn   106:             unless ($desturl=~/^(adm|editupload|public)/) {
1.101     raeburn   107:                 $desturl = &Apache::lonnet::clutter($desturl);
                    108:             }
                    109:             $desturl = &HTML::Entities::encode($desturl,'"<>&');
                    110:             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
1.130     raeburn   111:             $destination .= 'destinationurl='.$desturl.
1.101     raeburn   112:                             '&destsymb='.$destsymb;
                    113:         } else {
                    114:             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
1.130     raeburn   115:             $destination .= 'destinationurl='.$destsymb;
1.101     raeburn   116:         }
                    117:     }
1.111     raeburn   118:     if ($destination =~ m{^/adm/roles}) {
                    119:         $destination  .= ($destination =~ /\?/) ? '&' : '?';
                    120:         $destination .= 'source=login';
                    121:     }
1.100     raeburn   122: 
1.102     droeschl  123:     my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
                    124:     my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
1.99      bisitz    125:     my $brcrum = [{'href' => '',
                    126:                    'text' => 'Successful Login'},];
1.74      albertel  127:     my $start_page=&Apache::loncommon::start_page('Successful Login',
1.102     droeschl  128:                                                   $header,
1.104     droeschl  129:                                                   {'bread_crumbs' => $brcrum,});
1.74      albertel  130:     my $end_page  =&Apache::loncommon::end_page();
                    131: 
1.102     droeschl  132: 	my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
1.5       www       133: # ------------------------------------------------- Output for successful login
                    134: 
1.74      albertel  135:     &Apache::loncommon::content_type($r,'text/html');
                    136:     $r->header_out('Set-cookie' => $cookie);
                    137:     $r->send_http_header;
1.1       albertel  138: 
1.58      www       139:     my %lt=&Apache::lonlocal::texthash(
                    140: 				       'wel' => 'Welcome',
1.92      bisitz    141: 				       'pro' => 'Login problems?',
1.58      www       142: 				       );
1.122     raeburn   143:     my $loginhelp = &loginhelpdisplay($domain);
                    144:     if ($loginhelp) {
                    145:         $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
                    146:     }
                    147: 
1.112     raeburn   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>'); 
1.1       albertel  149:     $r->print(<<ENDSUCCESS);
1.74      albertel  150: $start_page
1.19      www       151: $windowinfo
1.58      www       152: <h1>$lt{'wel'}</h1>
1.122     raeburn   153: $welcome
                    154: $loginhelp
1.64      albertel  155: $continuelink
1.74      albertel  156: $end_page
1.1       albertel  157: ENDSUCCESS
1.134     raeburn   158:     return;
1.1       albertel  159: }
                    160: 
                    161: # --------------------------------------------------------------- Failed login!
                    162: 
                    163: sub failed {
1.85      albertel  164:     my ($r,$message,$form) = @_;
1.128     raeburn   165:     (undef,undef,undef,my $clientmathml,my $clientunicode) =
                    166:         &Apache::loncommon::decode_user_agent();
                    167:     my $args = {};
                    168:     if ($clientunicode && !$clientmathml) {
                    169:         $args = {'browser.unicode' => 1};
                    170:     }
                    171: 
                    172:     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
1.129     raeburn   173:     my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
                    174:     my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
                    175:     if (&Apache::lonnet::domain($udom,'description') eq '') {
                    176:         undef($udom);
1.130     raeburn   177:     }
1.129     raeburn   178:     my $retry = '/adm/login';
                    179:     if ($uname eq $form->{'uname'}) {
                    180:         $retry .= '?username='.$uname;
                    181:     }
1.128     raeburn   182:     if ($udom) {
1.129     raeburn   183:         $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;
1.128     raeburn   184:     }
1.100     raeburn   185:     if (exists($form->{role})) {
1.129     raeburn   186:         my $role = &Apache::loncommon::cleanup_html($form->{role});
1.130     raeburn   187:         if ($role ne '') {
1.129     raeburn   188:             $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;
                    189:         }
1.100     raeburn   190:     }
                    191:     if (exists($form->{symb})) {
1.129     raeburn   192:         my $symb = &Apache::loncommon::cleanup_html($form->{symb});
                    193:         if ($symb ne '') {
                    194:             $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;
                    195:         }
1.100     raeburn   196:     }
1.129     raeburn   197:     my $end_page = &Apache::loncommon::end_page();
1.74      albertel  198:     &Apache::loncommon::content_type($r,'text/html');
                    199:     $r->send_http_header;
1.132     bisitz    200:     my @actions =
                    201:          (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
1.128     raeburn   202:     my $loginhelp = &loginhelpdisplay($udom);
1.123     raeburn   203:     if ($loginhelp) {
1.132     bisitz    204:         push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
1.123     raeburn   205:     }
1.132     bisitz    206:     #FIXME: link to helpdesk might be added here
1.123     raeburn   207: 
1.92      bisitz    208:     $r->print(
                    209:        $start_page
1.132     bisitz    210:       .'<h2>'.&mt('Sorry ...').'</h2>'
                    211:       .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
                    212:       .&Apache::lonhtmlcommon::actionbox(\@actions)
1.92      bisitz    213:       .$end_page
                    214:     );
                    215:  }
1.60      www       216: 
1.55      www       217: # ------------------------------------------------------------------ Rerouting!
                    218: 
                    219: sub reroute {
1.74      albertel  220:     my ($r) = @_;
                    221:     &Apache::loncommon::content_type($r,'text/html');
                    222:     $r->send_http_header;
1.126     bisitz    223:     my $msg='<b>'.&mt('Sorry ...').'</b><br />'
1.92      bisitz    224:            .&mt('Please [_1]log in again[_2].');
1.126     bisitz    225:     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
1.55      www       226: }
                    227: 
1.1       albertel  228: # ---------------------------------------------------------------- Main handler
                    229: 
                    230: sub handler {
                    231:     my $r = shift;
1.120     raeburn   232:     my $londocroot = $r->dir_config('lonDocRoot');
1.85      albertel  233:     my $form;
1.55      www       234: # Are we re-routing?
1.120     raeburn   235:     if (-e "$londocroot/lon-status/reroute.txt") {
1.55      www       236: 	&reroute($r);
                    237: 	return OK;
                    238:     }
1.56      www       239: 
1.57      www       240:     &Apache::lonlocal::get_language_handle($r);
1.1       albertel  241: 
1.59      www       242: # -------------------------------- Prevent users from attempting to login twice
1.89      albertel  243:     my $handle = &Apache::lonnet::check_for_valid_session($r);
                    244:     if ($handle ne '') {
1.103     raeburn   245:         my $lonidsdir=$r->dir_config('lonIDsDir');
                    246:         if ($handle=~/^publicuser\_/) {
                    247: # For "public user" - remove it, we apparently really want to login
                    248:             unlink($r->dir_config('lonIDsDir')."/$handle.id");
                    249:         } else {
1.59      www       250: # Indeed, a valid token is found
1.103     raeburn   251:             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
                    252: 	    &Apache::loncommon::content_type($r,'text/html');
                    253: 	    $r->send_http_header;
                    254: 	    my $start_page = 
                    255: 	        &Apache::loncommon::start_page('Already logged in');
                    256: 	    my $end_page = 
                    257: 	        &Apache::loncommon::end_page();
1.105     raeburn   258:             my $dest = '/adm/roles';
                    259:             if ($env{'form.firsturl'} ne '') {
                    260:                 $dest = $env{'form.firsturl'};
                    261:             }
1.103     raeburn   262:             $r->print(
                    263:                $start_page
1.125     raeburn   264:               .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
1.103     raeburn   265:               .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
1.105     raeburn   266:                     ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
1.103     raeburn   267:               .'</p>'
                    268:               .$end_page
                    269:             );
                    270:             return OK;
                    271:         }
1.59      www       272:     }
                    273: 
                    274: # ---------------------------------------------------- No valid token, continue
                    275: 
                    276: 
1.1       albertel  277:     my $buffer;
1.84      albertel  278:     if ($r->header_in('Content-length') > 0) {
                    279: 	$r->read($buffer,$r->header_in('Content-length'),0);
                    280:     }
1.85      albertel  281:     my %form;
                    282:     foreach my $pair (split(/&/,$buffer)) {
                    283:        my ($name,$value) = split(/=/,$pair);
1.7       www       284:        $value =~ tr/+/ /;
                    285:        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
1.85      albertel  286:        $form{$name}=$value;
1.127     raeburn   287:     }
1.1       albertel  288: 
1.85      albertel  289:     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
                    290: 	&failed($r,'Username, password and domain need to be specified.',
                    291: 		\%form);
1.1       albertel  292:         return OK;
                    293:     }
1.61      www       294: 
                    295: # split user logging in and "su"-user
                    296: 
1.85      albertel  297:     ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
1.87      albertel  298:     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
                    299:     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
                    300:     $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
1.1       albertel  301: 
                    302:     my $role   = $r->dir_config('lonRole');
                    303:     my $domain = $r->dir_config('lonDefDomain');
                    304:     my $prodir = $r->dir_config('lonUsersDir');
1.93      raeburn   305:     my $contact_name = &mt('LON-CAPA helpdesk');
1.1       albertel  306: 
1.8       www       307: # ---------------------------------------- Get the information from login token
                    308: 
1.85      albertel  309:     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
                    310:                                       $form{'serverid'});
1.8       www       311: 
1.114     raeburn   312:     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') || 
                    313:         ($tmpinfo eq 'no_such_host')) {
1.85      albertel  314: 	&failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
1.8       www       315:         return OK;
1.44      www       316:     } else {
1.85      albertel  317: 	my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
                    318: 					   $form{'serverid'});
1.77      albertel  319:         if ( $reply ne 'ok' ) {
1.85      albertel  320:             &failed($r,'Session could not be opened.',\%form);
                    321: 	    &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
1.77      albertel  322: 	    return OK;
1.44      www       323: 	}
1.8       www       324:     }
1.100     raeburn   325: 
1.93      raeburn   326:     if (!&Apache::lonnet::domain($form{'udom'})) {
                    327:         &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
                    328:         return OK;
                    329:     }
1.100     raeburn   330: 
1.135   ! raeburn   331:     my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
1.100     raeburn   332:     if ($rolestr) {
                    333:         $rolestr = &unescape($rolestr);
                    334:     }
                    335:     if ($symbstr) {
                    336:         $symbstr= &unescape($symbstr);
                    337:     }
1.135   ! raeburn   338:     if ($iptokenstr) {
        !           339:         $iptokenstr = &unescape($iptokenstr);
        !           340:     }
1.100     raeburn   341:     if ($rolestr =~ /^role=/) {
                    342:         (undef,$form{'role'}) = split('=',$rolestr);
                    343:     }
                    344:     if ($symbstr =~ /^symb=/) { 
                    345:         (undef,$form{'symb'}) = split('=',$symbstr);
                    346:     }
1.135   ! raeburn   347:     if ($iptokenstr =~ /^iptoken=/) {
        !           348:         (undef,$form{'iptoken'}) = split('=',$iptokenstr);
        !           349:     }
1.8       www       350: 
                    351:     my $keybin=pack("H16",$key);
                    352: 
1.26      harris41  353:     my $cipher;
                    354:     if ($Crypt::DES::VERSION>=2.03) {
                    355: 	$cipher=new Crypt::DES $keybin;
                    356:     }
                    357:     else {
                    358: 	$cipher=new DES $keybin;
                    359:     }
1.67      www       360:     my $upass='';
                    361:     for (my $i=0;$i<=2;$i++) {
                    362: 	my $chunk=
1.85      albertel  363: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
1.8       www       364: 
1.67      www       365: 	$chunk.=
1.85      albertel  366: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
1.8       www       367: 
1.67      www       368: 	$chunk=substr($chunk,1,ord(substr($chunk,0,1)));
                    369: 	$upass.=$chunk;
                    370:     }
1.8       www       371: 
1.1       albertel  372: # ---------------------------------------------------------------- Authenticate
1.119     raeburn   373: 
1.90      raeburn   374:     my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
1.119     raeburn   375:     my ($cancreate,$statustocreate) =
                    376:         &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
                    377:     my $defaultauth;
                    378:     if (ref($cancreate) eq 'ARRAY') {
                    379:         if (grep(/^login$/,@{$cancreate})) {
                    380:             $defaultauth = 1;
1.90      raeburn   381:         }
                    382:     }
1.105     raeburn   383:     my $clientcancheckhost = 1;
1.90      raeburn   384:     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
1.105     raeburn   385:                                               $form{'udom'},$defaultauth,
                    386:                                               $clientcancheckhost);
1.1       albertel  387:     
                    388: # --------------------------------------------------------------------- Failed?
                    389: 
                    390:     if ($authhost eq 'no_host') {
1.85      albertel  391: 	&failed($r,'Username and/or password could not be authenticated.',
                    392: 		\%form);
1.1       albertel  393:         return OK;
1.90      raeburn   394:     } elsif ($authhost eq 'no_account_on_host') {
1.119     raeburn   395:         if ($defaultauth) {
1.105     raeburn   396:             my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
1.110     raeburn   397:             unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
                    398:                 return OK;
                    399:             }
1.90      raeburn   400:             my $start_page = 
1.104     droeschl  401:                 &Apache::loncommon::start_page('Create a user account in LON-CAPA');
1.93      raeburn   402:             my $lonhost = $r->dir_config('lonHostID');
                    403:             my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
                    404:             my $contacts = 
                    405:                 &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
                    406:                                                         $form{'udom'},$origmail);
                    407:             my ($contact_email) = split(',',$contacts); 
1.119     raeburn   408:             my $output = 
                    409:                 &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
                    410:                                                        $domdesc,'',$lonhost,
                    411:                                                        $contact_email,$contact_name,
                    412:                                                        undef,$statustocreate);
1.90      raeburn   413:             &Apache::loncommon::content_type($r,'text/html');
                    414:             $r->send_http_header;
                    415:             &Apache::createaccount::print_header($r,$start_page);
1.94      raeburn   416:             $r->print('<h3>'.&mt('Account creation').'</h3>'.
                    417:                       &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
                    418:                       $output.&Apache::loncommon::end_page());
1.90      raeburn   419:             return OK;
                    420:         } else {
                    421:             &failed($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);
                    422:             return OK;
                    423:         }
1.1       albertel  424:     }
                    425: 
1.59      www       426:     if (($firsturl eq '') || 
                    427: 	($firsturl=~/^\/adm\/(logout|remote)/)) {
1.24      www       428: 	$firsturl='/adm/roles';
1.7       www       429:     }
1.127     raeburn   430: 
                    431:     my $hosthere;
                    432:     if ($form{'iptoken'}) {
1.135   ! raeburn   433:         my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
        !           434:         my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
1.127     raeburn   435:         if (($sessiondata{'domain'} eq $form{'udom'}) &&
                    436:             ($sessiondata{'username'} eq $form{'uname'})) {
                    437:             $hosthere = 1;
                    438:         }
                    439:     }
                    440: 
1.61      www       441: # --------------------------------- Are we attempting to login as somebody else?
1.85      albertel  442:     if ($form{'suname'}) {
1.61      www       443: # ------------ see if the original user has enough privileges to pull this stunt
1.85      albertel  444: 	if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
1.61      www       445: # ---------------------------------------------------- see if the su-user exists
1.85      albertel  446: 	    unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
1.61      www       447: 		eq 'no_host') {
1.85      albertel  448: 		&Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
1.61      www       449: # ------------------------------ see if the su-user is not too highly privileged
1.85      albertel  450: 		unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
1.61      www       451: # -------------------------------------------------------- actually switch users
1.85      albertel  452: 		    &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
                    453: 			' logging in as '.$form{'suname'});
                    454: 		    $form{'uname'}=$form{'suname'};
1.61      www       455: 		} else {
                    456: 		    &Apache::lonnet::logthis('Attempted switch user to privileged user');
                    457: 		}
                    458: 	    }
                    459: 	} else {
                    460: 	    &Apache::lonnet::logthis('Non-privileged user attempting switch user');
                    461: 	}
                    462:     }
1.85      albertel  463: 
1.127     raeburn   464:     my ($is_balancer,$otherserver);
                    465: 
                    466:     unless ($hosthere) {
                    467:         ($is_balancer,$otherserver) =
                    468:             &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
                    469:     }
1.117     raeburn   470: 
                    471:     if ($is_balancer) {
1.115     raeburn   472:         if (!$otherserver) { 
1.116     raeburn   473:             ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
1.115     raeburn   474:         }
                    475:         if ($otherserver) {
                    476:             &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                    477:                      \%form);
1.131     raeburn   478:             my $switchto = '/adm/switchserver?otherserver='.$otherserver;
                    479:             if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
                    480:                 $switchto .= '&origurl='.$firsturl;
                    481:             }
                    482:             if ($form{'role'}) {
                    483:                 $switchto .= '&role='.$form{'role'};
                    484:             }
                    485:             if ($form{'symb'}) {
                    486:                 $switchto .= '&symb='.$form{'symb'};
                    487:             }
                    488:             $r->internal_redirect($switchto);
1.115     raeburn   489:         } else {
                    490:             $r->print(&noswitch());
                    491:         }
1.110     raeburn   492:         return OK;
1.81      albertel  493:     } else {
1.115     raeburn   494:         if (!&check_can_host($r,\%form,$authhost)) {
1.118     raeburn   495:             my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
1.115     raeburn   496:             if ($otherserver) {
                    497:                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                    498:                          \%form);
1.131     raeburn   499:                 my $switchto = '/adm/switchserver?otherserver='.$otherserver;
                    500:                 if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
                    501:                     $switchto .= '&origurl='.$firsturl;
                    502:                 }
                    503:                 if ($form{'role'}) {
                    504:                     $switchto .= '&role='.$form{'role'};
                    505:                 }
                    506:                 if ($form{'symb'}) {
                    507:                     $switchto .= '&symb='.$form{'symb'};
                    508:                 }
                    509:                 $r->internal_redirect($switchto);
1.115     raeburn   510:             } else {
                    511:                 $r->print(&noswitch());
                    512:             }
                    513:             return OK;
                    514:         }
                    515: 
1.109     raeburn   516: # ------------------------------------------------------- Do the load balancing
                    517: 
                    518: # ---------------------------------------------------------- Determine own load
                    519:         my $loadlim = $r->dir_config('lonLoadLim');
                    520:         my $loadavg;
                    521:         {
                    522:             my $loadfile=Apache::File->new('/proc/loadavg');
                    523:             $loadavg=<$loadfile>;
                    524:         }
                    525:         $loadavg =~ s/\s.*//g;
                    526:         my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
                    527:         my $userloadpercent=&Apache::lonnet::userload();
                    528: 
                    529: # ---------------------------------------------------------- Are we overloaded?
                    530:         if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
                    531:             my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
1.115     raeburn   532:             if (!$unloaded) {
1.118     raeburn   533:                 ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
1.115     raeburn   534:             }
1.109     raeburn   535:             if ($unloaded) {
                    536:                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
                    537:                          undef,\%form);
                    538:                 $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
1.110     raeburn   539:                 return OK;
1.109     raeburn   540:             }
                    541:         }
                    542:         &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
                    543:                  \%form);
1.110     raeburn   544:         return OK;
1.81      albertel  545:     }
1.1       albertel  546: }
                    547: 
1.105     raeburn   548: sub check_can_host {
                    549:     my ($r,$form,$authhost,$domdesc) = @_;
                    550:     return unless (ref($form) eq 'HASH');
                    551:     my $canhost = 1;
1.106     raeburn   552:     my $lonhost = $r->dir_config('lonHostID');
1.105     raeburn   553:     my $udom = $form->{'udom'};
1.108     raeburn   554:     my @intdoms;
                    555:     my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
                    556:     if (ref($internet_names) eq 'ARRAY') {
                    557:         @intdoms = @{$internet_names};
                    558:     }
1.106     raeburn   559:     my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
                    560:     my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
                    561:     unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
                    562:         my $machine_dom = &Apache::lonnet::host_domain($lonhost);
                    563:         my $hostname = &Apache::lonnet::hostname($lonhost);
                    564:         my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
                    565:         my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
                    566:         my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
1.105     raeburn   567:         my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
                    568:         my $loncaparev;
                    569:         if ($authhost eq 'no_account_on_host') {
1.106     raeburn   570:             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
1.105     raeburn   571:         } else {
1.106     raeburn   572:             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
1.105     raeburn   573:         }
1.106     raeburn   574:         $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
                    575:                                                      $udomdefaults{'remotesessions'},
                    576:                                                      $defdomdefaults{'hostedsessions'});
1.105     raeburn   577:     }
                    578:     unless ($canhost) {
                    579:         if ($authhost eq 'no_account_on_host') {
1.115     raeburn   580:             my $checkloginvia = 1;
                    581:             my ($login_host,$hostname) = 
                    582:                 &Apache::lonnet::choose_server($udom,$checkloginvia);
1.105     raeburn   583:             &Apache::loncommon::content_type($r,'text/html');
                    584:             $r->send_http_header;
                    585:             if ($login_host ne '') {
                    586:                 my $protocol = $Apache::lonnet::protocol{$login_host};
                    587:                 $protocol = 'http' if ($protocol ne 'https');
                    588:                 my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
                    589:                 $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
                    590:                           '<h3>'.&mt('Account creation').'</h3>'.
                    591:                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                    592:                           '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
                    593:                           '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
                    594:                           &Apache::loncommon::end_page());
                    595:             } else {
                    596:                 $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                    597:                           '<h3>'.&mt('Account creation unavailable').'</h3>'.
                    598:                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                    599:                           '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
                    600:                           &Apache::loncommon::end_page());
                    601:             }
                    602:         } else {
                    603:             &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
                    604:                      $form);
1.107     raeburn   605:             my ($otherserver) = &Apache::lonnet::choose_server($udom);
1.105     raeburn   606:             $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
                    607:         }
                    608:     }
1.110     raeburn   609:     return $canhost;
1.105     raeburn   610: }
                    611: 
1.115     raeburn   612: sub noswitch {
                    613:     my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                    614:                  '<h3>'.&mt('Session unavailable').'</h3>'.
                    615:                  &mt('This LON-CAPA server is unable to host your session.').'<br />'.
                    616:                  '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
                    617:                  &Apache::loncommon::end_page();
                    618:     return $result;
                    619: }
                    620: 
1.122     raeburn   621: sub loginhelpdisplay {
                    622:     my ($authdomain) = @_;
                    623:     my $login_help = 1;
                    624:     my $lang = &Apache::lonlocal::current_language();
                    625:     if ($login_help) {
                    626:         my $dom = $authdomain;
                    627:         if ($dom eq '') {
                    628:             $dom = &Apache::lonnet::default_login_domain();
                    629:         }
                    630:         my %domconfhash = &Apache::loncommon::get_domainconf($dom);
                    631:         my $loginhelp_url;
                    632:         if ($lang) {
                    633:             $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
                    634:             if ($loginhelp_url ne '') {
                    635:                 return $loginhelp_url;
                    636:             }
                    637:         }
                    638:         $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
                    639:         if ($loginhelp_url ne '') {
                    640:             return $loginhelp_url;
                    641:         } else {
                    642:             return '/adm/loginproblems.html';
                    643:         }
                    644:     }
                    645:     return;
                    646: }
                    647: 
1.1       albertel  648: 1;
                    649: __END__
1.7       www       650: 
                    651: 

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