Annotation of loncom/auth/lonauth.pm, revision 1.121.2.6

1.1       albertel    1: # The LearningOnline Network
                      2: # User Authentication Module
1.27      www         3: #
1.121.2.6! raeburn     4: # $Id: lonauth.pm,v 1.121.2.5 2013/08/28 14:12:56 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,'"<>&');
                    111:             $destination .= '&destinationurl='.$desturl.
                    112:                             '&destsymb='.$destsymb;
                    113:         } else {
                    114:             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
                    115:             $destination .= '&destinationurl='.$destsymb;
                    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) = @_;
1.104     droeschl  174:     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef);
1.100     raeburn   175:     my $retry = '/adm/login?username='.$form->{'uname'}.
                    176:                 '&domain='.$form->{'udom'};
                    177:     if (exists($form->{role})) {
                    178:         $retry .= '&role='.$form->{role};
                    179:     }
                    180:     if (exists($form->{symb})) {
                    181:         $retry .= '&symb='.$form->{symb};
                    182:     }
1.74      albertel  183:     my $end_page   = &Apache::loncommon::end_page();
                    184:     &Apache::loncommon::content_type($r,'text/html');
                    185:     $r->send_http_header;
1.121.2.2  raeburn   186:     my $loginhelp = &loginhelpdisplay($form->{'udom'});
                    187:     if ($loginhelp) {
                    188:         $loginhelp = '<p><a href="'.$loginhelp.'">'.&mt('Login problems?').'</a></p>';
                    189:     }
                    190: 
1.92      bisitz    191:     $r->print(
                    192:        $start_page
                    193:       .'<h1>'.&mt('Sorry ...').'</h1>'
1.95      bisitz    194:       .'<p class="LC_warning">'.&mt($message).'</p>'
1.100     raeburn   195:       .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>')
1.92      bisitz    196:       .'</p>'
1.121.2.2  raeburn   197:       .$loginhelp
1.92      bisitz    198:       .$end_page
                    199:     );
                    200:  }
1.60      www       201: 
1.55      www       202: # ------------------------------------------------------------------ Rerouting!
                    203: 
                    204: sub reroute {
1.74      albertel  205:     my ($r) = @_;
                    206:     &Apache::loncommon::content_type($r,'text/html');
                    207:     $r->send_http_header;
1.121.2.5  raeburn   208:     my $msg='<b>'.&mt('Sorry ...').'</b><br />'
1.92      bisitz    209:            .&mt('Please [_1]log in again[_2].');
1.121.2.5  raeburn   210:     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
1.55      www       211: }
                    212: 
1.1       albertel  213: # ---------------------------------------------------------------- Main handler
                    214: 
                    215: sub handler {
                    216:     my $r = shift;
1.120     raeburn   217:     my $londocroot = $r->dir_config('lonDocRoot');
1.85      albertel  218:     my $form;
1.55      www       219: # Are we re-routing?
1.120     raeburn   220:     if (-e "$londocroot/lon-status/reroute.txt") {
1.55      www       221: 	&reroute($r);
                    222: 	return OK;
                    223:     }
1.56      www       224: 
1.57      www       225:     &Apache::lonlocal::get_language_handle($r);
1.1       albertel  226: 
1.59      www       227: # -------------------------------- Prevent users from attempting to login twice
1.89      albertel  228:     my $handle = &Apache::lonnet::check_for_valid_session($r);
                    229:     if ($handle ne '') {
1.103     raeburn   230:         my $lonidsdir=$r->dir_config('lonIDsDir');
                    231:         if ($handle=~/^publicuser\_/) {
                    232: # For "public user" - remove it, we apparently really want to login
                    233:             unlink($r->dir_config('lonIDsDir')."/$handle.id");
                    234:         } else {
1.59      www       235: # Indeed, a valid token is found
1.103     raeburn   236:             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
                    237: 	    &Apache::loncommon::content_type($r,'text/html');
                    238: 	    $r->send_http_header;
                    239: 	    my $start_page = 
                    240: 	        &Apache::loncommon::start_page('Already logged in');
                    241: 	    my $end_page = 
                    242: 	        &Apache::loncommon::end_page();
1.105     raeburn   243:             my $dest = '/adm/roles';
                    244:             if ($env{'form.firsturl'} ne '') {
                    245:                 $dest = $env{'form.firsturl'};
                    246:             }
1.103     raeburn   247:             $r->print(
                    248:                $start_page
1.121.2.4  raeburn   249:               .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
1.103     raeburn   250:               .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
1.105     raeburn   251:                     ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
1.103     raeburn   252:               .'</p>'
                    253:               .$end_page
                    254:             );
                    255:             return OK;
                    256:         }
1.59      www       257:     }
                    258: 
                    259: # ---------------------------------------------------- No valid token, continue
                    260: 
                    261: 
1.1       albertel  262:     my $buffer;
1.84      albertel  263:     if ($r->header_in('Content-length') > 0) {
                    264: 	$r->read($buffer,$r->header_in('Content-length'),0);
                    265:     }
1.85      albertel  266:     my %form;
                    267:     foreach my $pair (split(/&/,$buffer)) {
                    268:        my ($name,$value) = split(/=/,$pair);
1.7       www       269:        $value =~ tr/+/ /;
                    270:        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
1.85      albertel  271:        $form{$name}=$value;
1.121.2.6! raeburn   272:     }
1.1       albertel  273: 
1.85      albertel  274:     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
                    275: 	&failed($r,'Username, password and domain need to be specified.',
                    276: 		\%form);
1.1       albertel  277:         return OK;
                    278:     }
1.61      www       279: 
                    280: # split user logging in and "su"-user
                    281: 
1.85      albertel  282:     ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
1.87      albertel  283:     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
                    284:     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
                    285:     $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
1.1       albertel  286: 
                    287:     my $role   = $r->dir_config('lonRole');
                    288:     my $domain = $r->dir_config('lonDefDomain');
                    289:     my $prodir = $r->dir_config('lonUsersDir');
1.93      raeburn   290:     my $contact_name = &mt('LON-CAPA helpdesk');
1.1       albertel  291: 
1.8       www       292: # ---------------------------------------- Get the information from login token
                    293: 
1.85      albertel  294:     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
                    295:                                       $form{'serverid'});
1.121.2.6! raeburn   296:     my %sessiondata;
        !           297:     if ($form{'iptoken'}) {
        !           298:         %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
        !           299:         my $delete = &Apache::lonnet::tmpdel($form{'token'});
        !           300:     }
1.8       www       301: 
1.114     raeburn   302:     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') || 
                    303:         ($tmpinfo eq 'no_such_host')) {
1.85      albertel  304: 	&failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
1.8       www       305:         return OK;
1.44      www       306:     } else {
1.85      albertel  307: 	my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
                    308: 					   $form{'serverid'});
1.77      albertel  309:         if ( $reply ne 'ok' ) {
1.85      albertel  310:             &failed($r,'Session could not be opened.',\%form);
                    311: 	    &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
1.77      albertel  312: 	    return OK;
1.44      www       313: 	}
1.8       www       314:     }
1.100     raeburn   315: 
1.93      raeburn   316:     if (!&Apache::lonnet::domain($form{'udom'})) {
                    317:         &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
                    318:         return OK;
                    319:     }
1.100     raeburn   320: 
                    321:     my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
                    322:     if ($rolestr) {
                    323:         $rolestr = &unescape($rolestr);
                    324:     }
                    325:     if ($symbstr) {
                    326:         $symbstr= &unescape($symbstr);
                    327:     }
                    328:     if ($rolestr =~ /^role=/) {
                    329:         (undef,$form{'role'}) = split('=',$rolestr);
                    330:     }
                    331:     if ($symbstr =~ /^symb=/) { 
                    332:         (undef,$form{'symb'}) = split('=',$symbstr);
                    333:     }
1.8       www       334: 
                    335:     my $keybin=pack("H16",$key);
                    336: 
1.26      harris41  337:     my $cipher;
                    338:     if ($Crypt::DES::VERSION>=2.03) {
                    339: 	$cipher=new Crypt::DES $keybin;
                    340:     }
                    341:     else {
                    342: 	$cipher=new DES $keybin;
                    343:     }
1.67      www       344:     my $upass='';
                    345:     for (my $i=0;$i<=2;$i++) {
                    346: 	my $chunk=
1.85      albertel  347: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
1.8       www       348: 
1.67      www       349: 	$chunk.=
1.85      albertel  350: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
1.8       www       351: 
1.67      www       352: 	$chunk=substr($chunk,1,ord(substr($chunk,0,1)));
                    353: 	$upass.=$chunk;
                    354:     }
1.8       www       355: 
1.1       albertel  356: # ---------------------------------------------------------------- Authenticate
1.119     raeburn   357: 
1.90      raeburn   358:     my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
1.119     raeburn   359:     my ($cancreate,$statustocreate) =
                    360:         &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
                    361:     my $defaultauth;
                    362:     if (ref($cancreate) eq 'ARRAY') {
                    363:         if (grep(/^login$/,@{$cancreate})) {
                    364:             $defaultauth = 1;
1.90      raeburn   365:         }
                    366:     }
1.105     raeburn   367:     my $clientcancheckhost = 1;
1.90      raeburn   368:     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
1.105     raeburn   369:                                               $form{'udom'},$defaultauth,
                    370:                                               $clientcancheckhost);
1.1       albertel  371:     
                    372: # --------------------------------------------------------------------- Failed?
                    373: 
                    374:     if ($authhost eq 'no_host') {
1.85      albertel  375: 	&failed($r,'Username and/or password could not be authenticated.',
                    376: 		\%form);
1.1       albertel  377:         return OK;
1.90      raeburn   378:     } elsif ($authhost eq 'no_account_on_host') {
1.119     raeburn   379:         if ($defaultauth) {
1.105     raeburn   380:             my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
1.110     raeburn   381:             unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
                    382:                 return OK;
                    383:             }
1.90      raeburn   384:             my $start_page = 
1.121.2.1  raeburn   385:                 &Apache::loncommon::start_page('Create a user account in LON-CAPA',
                    386:                                                '',{'no_inline_link'   => 1,});
1.93      raeburn   387:             my $lonhost = $r->dir_config('lonHostID');
                    388:             my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
                    389:             my $contacts = 
                    390:                 &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
                    391:                                                         $form{'udom'},$origmail);
                    392:             my ($contact_email) = split(',',$contacts); 
1.119     raeburn   393:             my $output = 
                    394:                 &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
                    395:                                                        $domdesc,'',$lonhost,
                    396:                                                        $contact_email,$contact_name,
                    397:                                                        undef,$statustocreate);
1.90      raeburn   398:             &Apache::loncommon::content_type($r,'text/html');
                    399:             $r->send_http_header;
                    400:             &Apache::createaccount::print_header($r,$start_page);
1.94      raeburn   401:             $r->print('<h3>'.&mt('Account creation').'</h3>'.
                    402:                       &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
                    403:                       $output.&Apache::loncommon::end_page());
1.90      raeburn   404:             return OK;
                    405:         } else {
                    406:             &failed($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);
                    407:             return OK;
                    408:         }
1.1       albertel  409:     }
                    410: 
1.59      www       411:     if (($firsturl eq '') || 
                    412: 	($firsturl=~/^\/adm\/(logout|remote)/)) {
1.24      www       413: 	$firsturl='/adm/roles';
1.7       www       414:     }
1.121.2.6! raeburn   415: 
        !           416:     my $hosthere;
        !           417:     if ($form{'iptoken'}) {
        !           418:         if (($sessiondata{'domain'} eq $form{'udom'}) &&
        !           419:             ($sessiondata{'username'} eq $form{'uname'})) {
        !           420:             $hosthere = 1;
        !           421:         }
        !           422:     }
        !           423: 
1.61      www       424: # --------------------------------- Are we attempting to login as somebody else?
1.85      albertel  425:     if ($form{'suname'}) {
1.61      www       426: # ------------ see if the original user has enough privileges to pull this stunt
1.85      albertel  427: 	if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
1.61      www       428: # ---------------------------------------------------- see if the su-user exists
1.85      albertel  429: 	    unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
1.61      www       430: 		eq 'no_host') {
1.85      albertel  431: 		&Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
1.61      www       432: # ------------------------------ see if the su-user is not too highly privileged
1.85      albertel  433: 		unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
1.61      www       434: # -------------------------------------------------------- actually switch users
1.85      albertel  435: 		    &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
                    436: 			' logging in as '.$form{'suname'});
                    437: 		    $form{'uname'}=$form{'suname'};
1.61      www       438: 		} else {
                    439: 		    &Apache::lonnet::logthis('Attempted switch user to privileged user');
                    440: 		}
                    441: 	    }
                    442: 	} else {
                    443: 	    &Apache::lonnet::logthis('Non-privileged user attempting switch user');
                    444: 	}
                    445:     }
1.85      albertel  446: 
1.121.2.6! raeburn   447:     my ($is_balancer,$otherserver);
        !           448: 
        !           449:     unless ($hosthere) {
        !           450:         ($is_balancer,$otherserver) =
        !           451:             &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
        !           452:     }
1.117     raeburn   453: 
                    454:     if ($is_balancer) {
1.115     raeburn   455:         if (!$otherserver) { 
1.116     raeburn   456:             ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
1.115     raeburn   457:         }
                    458:         if ($otherserver) {
                    459:             &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                    460:                      \%form);
                    461: 	    $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
                    462:         } else {
                    463:             $r->print(&noswitch());
                    464:         }
1.110     raeburn   465:         return OK;
1.81      albertel  466:     } else {
1.115     raeburn   467:         if (!&check_can_host($r,\%form,$authhost)) {
1.118     raeburn   468:             my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
1.115     raeburn   469:             if ($otherserver) {
                    470:                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                    471:                          \%form);
                    472:                 $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
                    473:             } else {
                    474:                 $r->print(&noswitch());
                    475:             }
                    476:             return OK;
                    477:         }
                    478: 
1.109     raeburn   479: # ------------------------------------------------------- Do the load balancing
                    480: 
                    481: # ---------------------------------------------------------- Determine own load
                    482:         my $loadlim = $r->dir_config('lonLoadLim');
                    483:         my $loadavg;
                    484:         {
                    485:             my $loadfile=Apache::File->new('/proc/loadavg');
                    486:             $loadavg=<$loadfile>;
                    487:         }
                    488:         $loadavg =~ s/\s.*//g;
                    489:         my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
                    490:         my $userloadpercent=&Apache::lonnet::userload();
                    491: 
                    492: # ---------------------------------------------------------- Are we overloaded?
                    493:         if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
                    494:             my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
1.115     raeburn   495:             if (!$unloaded) {
1.118     raeburn   496:                 ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
1.115     raeburn   497:             }
1.109     raeburn   498:             if ($unloaded) {
                    499:                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
                    500:                          undef,\%form);
                    501:                 $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
1.110     raeburn   502:                 return OK;
1.109     raeburn   503:             }
                    504:         }
                    505:         &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
                    506:                  \%form);
1.110     raeburn   507:         return OK;
1.81      albertel  508:     }
1.1       albertel  509: }
                    510: 
1.105     raeburn   511: sub check_can_host {
                    512:     my ($r,$form,$authhost,$domdesc) = @_;
                    513:     return unless (ref($form) eq 'HASH');
                    514:     my $canhost = 1;
1.106     raeburn   515:     my $lonhost = $r->dir_config('lonHostID');
1.105     raeburn   516:     my $udom = $form->{'udom'};
1.108     raeburn   517:     my @intdoms;
                    518:     my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
                    519:     if (ref($internet_names) eq 'ARRAY') {
                    520:         @intdoms = @{$internet_names};
                    521:     }
1.106     raeburn   522:     my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
                    523:     my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
                    524:     unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
                    525:         my $machine_dom = &Apache::lonnet::host_domain($lonhost);
                    526:         my $hostname = &Apache::lonnet::hostname($lonhost);
                    527:         my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
                    528:         my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
                    529:         my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
1.105     raeburn   530:         my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
                    531:         my $loncaparev;
                    532:         if ($authhost eq 'no_account_on_host') {
1.106     raeburn   533:             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
1.105     raeburn   534:         } else {
1.106     raeburn   535:             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
1.105     raeburn   536:         }
1.106     raeburn   537:         $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
                    538:                                                      $udomdefaults{'remotesessions'},
                    539:                                                      $defdomdefaults{'hostedsessions'});
1.105     raeburn   540:     }
                    541:     unless ($canhost) {
                    542:         if ($authhost eq 'no_account_on_host') {
1.115     raeburn   543:             my $checkloginvia = 1;
                    544:             my ($login_host,$hostname) = 
                    545:                 &Apache::lonnet::choose_server($udom,$checkloginvia);
1.105     raeburn   546:             &Apache::loncommon::content_type($r,'text/html');
                    547:             $r->send_http_header;
                    548:             if ($login_host ne '') {
                    549:                 my $protocol = $Apache::lonnet::protocol{$login_host};
                    550:                 $protocol = 'http' if ($protocol ne 'https');
                    551:                 my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
                    552:                 $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
                    553:                           '<h3>'.&mt('Account creation').'</h3>'.
                    554:                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                    555:                           '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
                    556:                           '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
                    557:                           &Apache::loncommon::end_page());
                    558:             } else {
                    559:                 $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                    560:                           '<h3>'.&mt('Account creation unavailable').'</h3>'.
                    561:                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                    562:                           '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
                    563:                           &Apache::loncommon::end_page());
                    564:             }
                    565:         } else {
                    566:             &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
                    567:                      $form);
1.107     raeburn   568:             my ($otherserver) = &Apache::lonnet::choose_server($udom);
1.105     raeburn   569:             $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
                    570:         }
                    571:     }
1.110     raeburn   572:     return $canhost;
1.105     raeburn   573: }
                    574: 
1.115     raeburn   575: sub noswitch {
                    576:     my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                    577:                  '<h3>'.&mt('Session unavailable').'</h3>'.
                    578:                  &mt('This LON-CAPA server is unable to host your session.').'<br />'.
                    579:                  '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
                    580:                  &Apache::loncommon::end_page();
                    581:     return $result;
                    582: }
                    583: 
1.121.2.2  raeburn   584: sub loginhelpdisplay {
                    585:     my ($authdomain) = @_;
                    586:     my $login_help = 1;
                    587:     my $lang = &Apache::lonlocal::current_language();
                    588:     if ($login_help) {
                    589:         my $dom = $authdomain;
                    590:         if ($dom eq '') {
                    591:             $dom = &Apache::lonnet::default_login_domain();
                    592:         }
                    593:         my %domconfhash = &Apache::loncommon::get_domainconf($dom);
                    594:         my $loginhelp_url;
                    595:         if ($lang) {
                    596:             $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
                    597:             if ($loginhelp_url ne '') {
                    598:                 return $loginhelp_url;
                    599:             }
                    600:         }
                    601:         $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
                    602:         if ($loginhelp_url ne '') {
                    603:             return $loginhelp_url;
                    604:         } else {
                    605:             return '/adm/loginproblems.html';
                    606:         }
                    607:     }
                    608:     return;
                    609: }
                    610: 
1.1       albertel  611: 1;
                    612: __END__
1.7       www       613: 
                    614: 

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