Annotation of loncom/auth/lonauth.pm, revision 1.121.2.10

1.1       albertel    1: # The LearningOnline Network
                      2: # User Authentication Module
1.27      www         3: #
1.121.2.10! raeburn     4: # $Id: lonauth.pm,v 1.121.2.9 2014/02/26 20:46:45 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(/___/,$destsymb);
1.121.2.3  raeburn   106:             unless ($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,'"<>&');
1.121.2.8  raeburn   111:             $destination .= 'destinationurl='.$desturl.
1.101     raeburn   112:                             '&destsymb='.$destsymb;
                    113:         } else {
                    114:             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
1.121.2.8  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: 
1.121.2.1  raeburn   123:     my $windowinfo=&Apache::lonmenu::open($env{'browser.os'});
                    124:     my $startupremote=&Apache::lonmenu::startupremote($destination);
                    125:     my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
                    126:     my $setflags=&Apache::lonmenu::setflags();
                    127:     my $maincall=&Apache::lonmenu::maincall();
1.99      bisitz    128:     my $brcrum = [{'href' => '',
                    129:                    'text' => 'Successful Login'},];
1.74      albertel  130:     my $start_page=&Apache::loncommon::start_page('Successful Login',
1.121.2.1  raeburn   131:                                                   $startupremote,
                    132:                                                   {'no_inline_link' => 1,
                    133:                                                    'bread_crumbs' => $brcrum,});
1.74      albertel  134:     my $end_page  =&Apache::loncommon::end_page();
                    135: 
1.121.2.1  raeburn   136:     my $continuelink;
                    137:     if ($env{'environment.remote'} eq 'off') {
                    138: 	$continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
                    139:     }
1.5       www       140: # ------------------------------------------------- Output for successful login
                    141: 
1.74      albertel  142:     &Apache::loncommon::content_type($r,'text/html');
                    143:     $r->header_out('Set-cookie' => $cookie);
                    144:     $r->send_http_header;
1.1       albertel  145: 
1.58      www       146:     my %lt=&Apache::lonlocal::texthash(
                    147: 				       'wel' => 'Welcome',
1.92      bisitz    148: 				       'pro' => 'Login problems?',
1.58      www       149: 				       );
1.121.2.2  raeburn   150:     my $loginhelp = &loginhelpdisplay($domain);
                    151:     if ($loginhelp) {
                    152:         $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
                    153:     }
                    154: 
1.112     raeburn   155:     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  156:     $r->print(<<ENDSUCCESS);
1.74      albertel  157: $start_page
1.121.2.1  raeburn   158: $setflags
1.19      www       159: $windowinfo
1.58      www       160: <h1>$lt{'wel'}</h1>
1.121.2.2  raeburn   161: $welcome
                    162: $loginhelp
1.121.2.1  raeburn   163: $remoteinfo
                    164: $maincall
1.64      albertel  165: $continuelink
1.74      albertel  166: $end_page
1.1       albertel  167: ENDSUCCESS
                    168: }
                    169: 
                    170: # --------------------------------------------------------------- Failed login!
                    171: 
                    172: sub failed {
1.85      albertel  173:     my ($r,$message,$form) = @_;
1.121.2.7  raeburn   174:     (undef,undef,undef,my $clientmathml,my $clientunicode) =
                    175:         &Apache::loncommon::decode_user_agent();
                    176:     my $args = {};
                    177:     if ($clientunicode && !$clientmathml) {
                    178:         $args = {'browser.unicode' => 1};
                    179:     }
                    180: 
                    181:     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
                    182:     my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
                    183:     my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
                    184:     if (&Apache::lonnet::domain($udom,'description') eq '') {
                    185:         undef($udom);
                    186:     }
                    187:     my $retry = '/adm/login';
                    188:     if ($uname eq $form->{'uname'}) {
                    189:         $retry .= '?username='.$uname;
                    190:     }
                    191:     if ($udom) {
                    192:         $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;
                    193:     }
1.100     raeburn   194:     if (exists($form->{role})) {
1.121.2.7  raeburn   195:         my $role = &Apache::loncommon::cleanup_html($form->{role});
                    196:         if ($role ne '') {
                    197:             $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;
                    198:         }
1.100     raeburn   199:     }
                    200:     if (exists($form->{symb})) {
1.121.2.7  raeburn   201:         my $symb = &Apache::loncommon::cleanup_html($form->{symb});
                    202:         if ($symb ne '') {
                    203:             $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;
                    204:         }
1.100     raeburn   205:     }
1.121.2.7  raeburn   206:     my $end_page = &Apache::loncommon::end_page();
1.74      albertel  207:     &Apache::loncommon::content_type($r,'text/html');
                    208:     $r->send_http_header;
1.121.2.9  raeburn   209:     my @actions =
                    210:          (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
1.121.2.7  raeburn   211:     my $loginhelp = &loginhelpdisplay($udom);
1.121.2.2  raeburn   212:     if ($loginhelp) {
1.121.2.9  raeburn   213:         push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
1.121.2.2  raeburn   214:     }
1.121.2.9  raeburn   215:     #FIXME: link to helpdesk might be added here
1.121.2.2  raeburn   216: 
1.92      bisitz    217:     $r->print(
                    218:        $start_page
1.121.2.9  raeburn   219:       .'<h2>'.&mt('Sorry ...').'</h2>'
                    220:       .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
                    221:       .&Apache::lonhtmlcommon::actionbox(\@actions)
1.92      bisitz    222:       .$end_page
                    223:     );
                    224:  }
1.60      www       225: 
1.55      www       226: # ------------------------------------------------------------------ Rerouting!
                    227: 
                    228: sub reroute {
1.74      albertel  229:     my ($r) = @_;
                    230:     &Apache::loncommon::content_type($r,'text/html');
                    231:     $r->send_http_header;
1.121.2.5  raeburn   232:     my $msg='<b>'.&mt('Sorry ...').'</b><br />'
1.92      bisitz    233:            .&mt('Please [_1]log in again[_2].');
1.121.2.5  raeburn   234:     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
1.55      www       235: }
                    236: 
1.1       albertel  237: # ---------------------------------------------------------------- Main handler
                    238: 
                    239: sub handler {
                    240:     my $r = shift;
1.120     raeburn   241:     my $londocroot = $r->dir_config('lonDocRoot');
1.85      albertel  242:     my $form;
1.55      www       243: # Are we re-routing?
1.120     raeburn   244:     if (-e "$londocroot/lon-status/reroute.txt") {
1.55      www       245: 	&reroute($r);
                    246: 	return OK;
                    247:     }
1.56      www       248: 
1.57      www       249:     &Apache::lonlocal::get_language_handle($r);
1.1       albertel  250: 
1.59      www       251: # -------------------------------- Prevent users from attempting to login twice
1.89      albertel  252:     my $handle = &Apache::lonnet::check_for_valid_session($r);
                    253:     if ($handle ne '') {
1.103     raeburn   254:         my $lonidsdir=$r->dir_config('lonIDsDir');
                    255:         if ($handle=~/^publicuser\_/) {
                    256: # For "public user" - remove it, we apparently really want to login
                    257:             unlink($r->dir_config('lonIDsDir')."/$handle.id");
                    258:         } else {
1.59      www       259: # Indeed, a valid token is found
1.103     raeburn   260:             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
                    261: 	    &Apache::loncommon::content_type($r,'text/html');
                    262: 	    $r->send_http_header;
                    263: 	    my $start_page = 
                    264: 	        &Apache::loncommon::start_page('Already logged in');
                    265: 	    my $end_page = 
                    266: 	        &Apache::loncommon::end_page();
1.105     raeburn   267:             my $dest = '/adm/roles';
                    268:             if ($env{'form.firsturl'} ne '') {
                    269:                 $dest = $env{'form.firsturl'};
                    270:             }
1.103     raeburn   271:             $r->print(
                    272:                $start_page
1.121.2.4  raeburn   273:               .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
1.103     raeburn   274:               .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
1.105     raeburn   275:                     ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
1.103     raeburn   276:               .'</p>'
                    277:               .$end_page
                    278:             );
                    279:             return OK;
                    280:         }
1.59      www       281:     }
                    282: 
                    283: # ---------------------------------------------------- No valid token, continue
                    284: 
                    285: 
1.1       albertel  286:     my $buffer;
1.84      albertel  287:     if ($r->header_in('Content-length') > 0) {
                    288: 	$r->read($buffer,$r->header_in('Content-length'),0);
                    289:     }
1.85      albertel  290:     my %form;
                    291:     foreach my $pair (split(/&/,$buffer)) {
                    292:        my ($name,$value) = split(/=/,$pair);
1.7       www       293:        $value =~ tr/+/ /;
                    294:        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
1.85      albertel  295:        $form{$name}=$value;
1.121.2.6  raeburn   296:     }
1.1       albertel  297: 
1.85      albertel  298:     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
                    299: 	&failed($r,'Username, password and domain need to be specified.',
                    300: 		\%form);
1.1       albertel  301:         return OK;
                    302:     }
1.61      www       303: 
                    304: # split user logging in and "su"-user
                    305: 
1.85      albertel  306:     ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
1.87      albertel  307:     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
                    308:     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
                    309:     $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
1.1       albertel  310: 
                    311:     my $role   = $r->dir_config('lonRole');
                    312:     my $domain = $r->dir_config('lonDefDomain');
                    313:     my $prodir = $r->dir_config('lonUsersDir');
1.93      raeburn   314:     my $contact_name = &mt('LON-CAPA helpdesk');
1.1       albertel  315: 
1.8       www       316: # ---------------------------------------- Get the information from login token
                    317: 
1.85      albertel  318:     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
                    319:                                       $form{'serverid'});
1.121.2.7  raeburn   320: 
1.121.2.6  raeburn   321:     my %sessiondata;
                    322:     if ($form{'iptoken'}) {
                    323:         %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
1.121.2.10! raeburn   324:         my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
1.121.2.6  raeburn   325:     }
1.8       www       326: 
1.114     raeburn   327:     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') || 
                    328:         ($tmpinfo eq 'no_such_host')) {
1.85      albertel  329: 	&failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
1.8       www       330:         return OK;
1.44      www       331:     } else {
1.85      albertel  332: 	my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
                    333: 					   $form{'serverid'});
1.77      albertel  334:         if ( $reply ne 'ok' ) {
1.85      albertel  335:             &failed($r,'Session could not be opened.',\%form);
                    336: 	    &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
1.77      albertel  337: 	    return OK;
1.44      www       338: 	}
1.8       www       339:     }
1.100     raeburn   340: 
1.93      raeburn   341:     if (!&Apache::lonnet::domain($form{'udom'})) {
                    342:         &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
                    343:         return OK;
                    344:     }
1.100     raeburn   345: 
                    346:     my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
                    347:     if ($rolestr) {
                    348:         $rolestr = &unescape($rolestr);
                    349:     }
                    350:     if ($symbstr) {
                    351:         $symbstr= &unescape($symbstr);
                    352:     }
                    353:     if ($rolestr =~ /^role=/) {
                    354:         (undef,$form{'role'}) = split('=',$rolestr);
                    355:     }
                    356:     if ($symbstr =~ /^symb=/) { 
                    357:         (undef,$form{'symb'}) = split('=',$symbstr);
                    358:     }
1.8       www       359: 
                    360:     my $keybin=pack("H16",$key);
                    361: 
1.26      harris41  362:     my $cipher;
                    363:     if ($Crypt::DES::VERSION>=2.03) {
                    364: 	$cipher=new Crypt::DES $keybin;
                    365:     }
                    366:     else {
                    367: 	$cipher=new DES $keybin;
                    368:     }
1.67      www       369:     my $upass='';
                    370:     for (my $i=0;$i<=2;$i++) {
                    371: 	my $chunk=
1.85      albertel  372: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
1.8       www       373: 
1.67      www       374: 	$chunk.=
1.85      albertel  375: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
1.8       www       376: 
1.67      www       377: 	$chunk=substr($chunk,1,ord(substr($chunk,0,1)));
                    378: 	$upass.=$chunk;
                    379:     }
1.8       www       380: 
1.1       albertel  381: # ---------------------------------------------------------------- Authenticate
1.119     raeburn   382: 
1.90      raeburn   383:     my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
1.119     raeburn   384:     my ($cancreate,$statustocreate) =
                    385:         &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
                    386:     my $defaultauth;
                    387:     if (ref($cancreate) eq 'ARRAY') {
                    388:         if (grep(/^login$/,@{$cancreate})) {
                    389:             $defaultauth = 1;
1.90      raeburn   390:         }
                    391:     }
1.105     raeburn   392:     my $clientcancheckhost = 1;
1.90      raeburn   393:     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
1.105     raeburn   394:                                               $form{'udom'},$defaultauth,
                    395:                                               $clientcancheckhost);
1.1       albertel  396:     
                    397: # --------------------------------------------------------------------- Failed?
                    398: 
                    399:     if ($authhost eq 'no_host') {
1.85      albertel  400: 	&failed($r,'Username and/or password could not be authenticated.',
                    401: 		\%form);
1.1       albertel  402:         return OK;
1.90      raeburn   403:     } elsif ($authhost eq 'no_account_on_host') {
1.119     raeburn   404:         if ($defaultauth) {
1.105     raeburn   405:             my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
1.110     raeburn   406:             unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
                    407:                 return OK;
                    408:             }
1.90      raeburn   409:             my $start_page = 
1.121.2.1  raeburn   410:                 &Apache::loncommon::start_page('Create a user account in LON-CAPA',
                    411:                                                '',{'no_inline_link'   => 1,});
1.93      raeburn   412:             my $lonhost = $r->dir_config('lonHostID');
                    413:             my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
                    414:             my $contacts = 
                    415:                 &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
                    416:                                                         $form{'udom'},$origmail);
                    417:             my ($contact_email) = split(',',$contacts); 
1.119     raeburn   418:             my $output = 
                    419:                 &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
                    420:                                                        $domdesc,'',$lonhost,
                    421:                                                        $contact_email,$contact_name,
                    422:                                                        undef,$statustocreate);
1.90      raeburn   423:             &Apache::loncommon::content_type($r,'text/html');
                    424:             $r->send_http_header;
                    425:             &Apache::createaccount::print_header($r,$start_page);
1.94      raeburn   426:             $r->print('<h3>'.&mt('Account creation').'</h3>'.
                    427:                       &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
                    428:                       $output.&Apache::loncommon::end_page());
1.90      raeburn   429:             return OK;
                    430:         } else {
                    431:             &failed($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);
                    432:             return OK;
                    433:         }
1.1       albertel  434:     }
                    435: 
1.59      www       436:     if (($firsturl eq '') || 
                    437: 	($firsturl=~/^\/adm\/(logout|remote)/)) {
1.24      www       438: 	$firsturl='/adm/roles';
1.7       www       439:     }
1.121.2.6  raeburn   440: 
                    441:     my $hosthere;
                    442:     if ($form{'iptoken'}) {
                    443:         if (($sessiondata{'domain'} eq $form{'udom'}) &&
                    444:             ($sessiondata{'username'} eq $form{'uname'})) {
                    445:             $hosthere = 1;
                    446:         }
                    447:     }
                    448: 
1.61      www       449: # --------------------------------- Are we attempting to login as somebody else?
1.85      albertel  450:     if ($form{'suname'}) {
1.61      www       451: # ------------ see if the original user has enough privileges to pull this stunt
1.85      albertel  452: 	if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
1.61      www       453: # ---------------------------------------------------- see if the su-user exists
1.85      albertel  454: 	    unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
1.61      www       455: 		eq 'no_host') {
1.85      albertel  456: 		&Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
1.61      www       457: # ------------------------------ see if the su-user is not too highly privileged
1.85      albertel  458: 		unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
1.61      www       459: # -------------------------------------------------------- actually switch users
1.85      albertel  460: 		    &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
                    461: 			' logging in as '.$form{'suname'});
                    462: 		    $form{'uname'}=$form{'suname'};
1.61      www       463: 		} else {
                    464: 		    &Apache::lonnet::logthis('Attempted switch user to privileged user');
                    465: 		}
                    466: 	    }
                    467: 	} else {
                    468: 	    &Apache::lonnet::logthis('Non-privileged user attempting switch user');
                    469: 	}
                    470:     }
1.85      albertel  471: 
1.121.2.6  raeburn   472:     my ($is_balancer,$otherserver);
                    473: 
                    474:     unless ($hosthere) {
                    475:         ($is_balancer,$otherserver) =
                    476:             &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
                    477:     }
1.117     raeburn   478: 
                    479:     if ($is_balancer) {
1.115     raeburn   480:         if (!$otherserver) { 
1.116     raeburn   481:             ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
1.115     raeburn   482:         }
                    483:         if ($otherserver) {
                    484:             &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                    485:                      \%form);
1.121.2.8  raeburn   486:             my $switchto = '/adm/switchserver?otherserver='.$otherserver;
                    487:             if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
                    488:                 $switchto .= '&origurl='.$firsturl;
                    489:             }
                    490:             if ($form{'role'}) {
                    491:                 $switchto .= '&role='.$form{'role'};
                    492:             }
                    493:             if ($form{'symb'}) {
                    494:                 $switchto .= '&symb='.$form{'symb'};
                    495:             }
                    496:             $r->internal_redirect($switchto);
1.115     raeburn   497:         } else {
                    498:             $r->print(&noswitch());
                    499:         }
1.110     raeburn   500:         return OK;
1.81      albertel  501:     } else {
1.115     raeburn   502:         if (!&check_can_host($r,\%form,$authhost)) {
1.118     raeburn   503:             my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
1.115     raeburn   504:             if ($otherserver) {
                    505:                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                    506:                          \%form);
1.121.2.8  raeburn   507:                 my $switchto = '/adm/switchserver?otherserver='.$otherserver;
                    508:                 if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
                    509:                     $switchto .= '&origurl='.$firsturl;
                    510:                 }
                    511:                 if ($form{'role'}) {
                    512:                     $switchto .= '&role='.$form{'role'};
                    513:                 }
                    514:                 if ($form{'symb'}) {
                    515:                     $switchto .= '&symb='.$form{'symb'};
                    516:                 }
                    517:                 $r->internal_redirect($switchto);
1.115     raeburn   518:             } else {
                    519:                 $r->print(&noswitch());
                    520:             }
                    521:             return OK;
                    522:         }
                    523: 
1.109     raeburn   524: # ------------------------------------------------------- Do the load balancing
                    525: 
                    526: # ---------------------------------------------------------- Determine own load
                    527:         my $loadlim = $r->dir_config('lonLoadLim');
                    528:         my $loadavg;
                    529:         {
                    530:             my $loadfile=Apache::File->new('/proc/loadavg');
                    531:             $loadavg=<$loadfile>;
                    532:         }
                    533:         $loadavg =~ s/\s.*//g;
                    534:         my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
                    535:         my $userloadpercent=&Apache::lonnet::userload();
                    536: 
                    537: # ---------------------------------------------------------- Are we overloaded?
                    538:         if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
                    539:             my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
1.115     raeburn   540:             if (!$unloaded) {
1.118     raeburn   541:                 ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
1.115     raeburn   542:             }
1.109     raeburn   543:             if ($unloaded) {
                    544:                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
                    545:                          undef,\%form);
                    546:                 $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
1.110     raeburn   547:                 return OK;
1.109     raeburn   548:             }
                    549:         }
                    550:         &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
                    551:                  \%form);
1.110     raeburn   552:         return OK;
1.81      albertel  553:     }
1.1       albertel  554: }
                    555: 
1.105     raeburn   556: sub check_can_host {
                    557:     my ($r,$form,$authhost,$domdesc) = @_;
                    558:     return unless (ref($form) eq 'HASH');
                    559:     my $canhost = 1;
1.106     raeburn   560:     my $lonhost = $r->dir_config('lonHostID');
1.105     raeburn   561:     my $udom = $form->{'udom'};
1.108     raeburn   562:     my @intdoms;
                    563:     my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
                    564:     if (ref($internet_names) eq 'ARRAY') {
                    565:         @intdoms = @{$internet_names};
                    566:     }
1.106     raeburn   567:     my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
                    568:     my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
                    569:     unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
                    570:         my $machine_dom = &Apache::lonnet::host_domain($lonhost);
                    571:         my $hostname = &Apache::lonnet::hostname($lonhost);
                    572:         my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
                    573:         my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
                    574:         my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
1.105     raeburn   575:         my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
                    576:         my $loncaparev;
                    577:         if ($authhost eq 'no_account_on_host') {
1.106     raeburn   578:             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
1.105     raeburn   579:         } else {
1.106     raeburn   580:             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
1.105     raeburn   581:         }
1.106     raeburn   582:         $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
                    583:                                                      $udomdefaults{'remotesessions'},
                    584:                                                      $defdomdefaults{'hostedsessions'});
1.105     raeburn   585:     }
                    586:     unless ($canhost) {
                    587:         if ($authhost eq 'no_account_on_host') {
1.115     raeburn   588:             my $checkloginvia = 1;
                    589:             my ($login_host,$hostname) = 
                    590:                 &Apache::lonnet::choose_server($udom,$checkloginvia);
1.105     raeburn   591:             &Apache::loncommon::content_type($r,'text/html');
                    592:             $r->send_http_header;
                    593:             if ($login_host ne '') {
                    594:                 my $protocol = $Apache::lonnet::protocol{$login_host};
                    595:                 $protocol = 'http' if ($protocol ne 'https');
                    596:                 my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
                    597:                 $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
                    598:                           '<h3>'.&mt('Account creation').'</h3>'.
                    599:                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                    600:                           '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
                    601:                           '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
                    602:                           &Apache::loncommon::end_page());
                    603:             } else {
                    604:                 $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                    605:                           '<h3>'.&mt('Account creation unavailable').'</h3>'.
                    606:                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                    607:                           '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
                    608:                           &Apache::loncommon::end_page());
                    609:             }
                    610:         } else {
                    611:             &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
                    612:                      $form);
1.107     raeburn   613:             my ($otherserver) = &Apache::lonnet::choose_server($udom);
1.105     raeburn   614:             $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
                    615:         }
                    616:     }
1.110     raeburn   617:     return $canhost;
1.105     raeburn   618: }
                    619: 
1.115     raeburn   620: sub noswitch {
                    621:     my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                    622:                  '<h3>'.&mt('Session unavailable').'</h3>'.
                    623:                  &mt('This LON-CAPA server is unable to host your session.').'<br />'.
                    624:                  '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
                    625:                  &Apache::loncommon::end_page();
                    626:     return $result;
                    627: }
                    628: 
1.121.2.2  raeburn   629: sub loginhelpdisplay {
                    630:     my ($authdomain) = @_;
                    631:     my $login_help = 1;
                    632:     my $lang = &Apache::lonlocal::current_language();
                    633:     if ($login_help) {
                    634:         my $dom = $authdomain;
                    635:         if ($dom eq '') {
                    636:             $dom = &Apache::lonnet::default_login_domain();
                    637:         }
                    638:         my %domconfhash = &Apache::loncommon::get_domainconf($dom);
                    639:         my $loginhelp_url;
                    640:         if ($lang) {
                    641:             $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
                    642:             if ($loginhelp_url ne '') {
                    643:                 return $loginhelp_url;
                    644:             }
                    645:         }
                    646:         $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
                    647:         if ($loginhelp_url ne '') {
                    648:             return $loginhelp_url;
                    649:         } else {
                    650:             return '/adm/loginproblems.html';
                    651:         }
                    652:     }
                    653:     return;
                    654: }
                    655: 
1.1       albertel  656: 1;
                    657: __END__
1.7       www       658: 
                    659: 

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