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Diff for /loncom/auth/lonauth.pm between versions 1.31 and 1.138

version 1.31, 2002/05/29 14:51:42 version 1.138, 2015/03/06 21:56:41
Line 1 Line 1
 # The LearningOnline Network  # The LearningOnline Network
 # User Authentication Module  # User Authentication Module
 #  #
 # $Id$  # $Id$
 #  #
 # Copyright Michigan State University Board of Trustees  # Copyright Michigan State University Board of Trustees
 #  #
 # This file is part of the LearningOnline Network with CAPA (LON-CAPA).  # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
 #  #
 # LON-CAPA is free software; you can redistribute it and/or modify  # LON-CAPA is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by  # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 2 of the License, or  # the Free Software Foundation; either version 2 of the License, or
 # (at your option) any later version.  # (at your option) any later version.
 #  #
 # LON-CAPA is distributed in the hope that it will be useful,  # LON-CAPA is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of  # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.  # GNU General Public License for more details.
 #  #
 # You should have received a copy of the GNU General Public License  # You should have received a copy of the GNU General Public License
 # along with LON-CAPA; if not, write to the Free Software  # along with LON-CAPA; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA  # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 #  #
 # /home/httpd/html/adm/gpl.txt  # /home/httpd/html/adm/gpl.txt
 #  #
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
 # 5/21/99,5/22,5/25,5/26,5/27,5/29,6/2,6/11,6/14,6/15  
 # 16/11,12/16,  package Apache::lonauth;
 # 1/14,2/24,2/28,2/29,3/7,5/29,5/30,5/31,6/1,6/5,6/29,  
 # 7/1,7/10,10/2,10/5,10/9,10/26,10/30,11/10,  use strict;
 # 05/28,05/29 Gerd Kortemeyer  use LONCAPA;
 # 07/24 Scott Harrison  use Apache::Constants qw(:common);
 # 07/28,08/03 Gerd Kortemeyer  use CGI qw(:standard);
 # 8/15 Scott Harrison  use DynaLoader; # for Crypt::DES version
 # 8/20 Gerd Kortemeyer  use Crypt::DES;
   use Apache::loncommon();
 package Apache::lonauth;  use Apache::lonnet;
   use Apache::lonmenu();
 use strict;  use Apache::createaccount;
 use Apache::Constants qw(:common);  use Fcntl qw(:flock);
 use Apache::File;  use Apache::lonlocal;
 use CGI qw(:standard);  use Apache::File();
 use CGI::Cookie();  use HTML::Entities;
 use DynaLoader; # for Crypt::DES version   
 use Crypt::DES;  # ------------------------------------------------------------ Successful login
 use Apache::lonnet();  sub success {
 use Apache::lonmenu();      my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
 use Fcntl qw(:flock);   $form) = @_;
 # ------------------------------------------------------------ Successful login  
   # ------------------------------------------------------------ Get cookie ready
 sub success {      my $cookie =
     my ($r, $username, $domain, $authhost,$lowerurl) = @_;   &Apache::loncommon::init_user_environment($r, $username, $domain,
     my $lonids=$r->dir_config('lonIDsDir');    $authhost, $form,
     {'extra_env' => $extra_env,});
 # See if old ID present, if so, remove  
       my $public=($username eq 'public' && $domain eq 'public');
     my $filename;  
     opendir(DIR,$lonids);      if ($public or $lowerurl eq 'noredirect') { return $cookie; }
     while ($filename=readdir(DIR)) {  
        if ($filename=~/^$username\_\d+\_$domain\_$authhost\.id$/) {  # -------------------------------------------------------------------- Log this
   unlink($lonids.'/'.$filename);  
        }      &Apache::lonnet::log($domain,$username,$authhost,
     }                           "Login $ENV{'REMOTE_ADDR'}");
     closedir(DIR);  
   # ------------------------------------------------- Check for critical messages
 # Give them a new cookie  
       my @what=&Apache::lonnet::dump('critical',$domain,$username);
     my $cookie;      if ($what[0]) {
     my $now=time;   if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
     $cookie="$username\_$now\_$domain\_$authhost";      $lowerurl='/adm/email?critical=display';
           }
 # Initialize roles      }
   
     my $userroles=Apache::lonnet::rolesinit($domain,$username,$authhost);  # ------------------------------------------------------------ Get cookie ready
       $cookie="lonID=$cookie; path=/";
 # ------------------------------------ Check browser type and MathML capability  # -------------------------------------------------------- Menu script and info
       my $destination = $lowerurl;
     my @browsertype=split(/\&/,$r->dir_config("lonBrowsDet"));  
     my %mathcap=split(/\&/,$r->dir_config("lonMathML"));      if (defined($form->{role})) {
     my $httpbrowser=$ENV{"HTTP_USER_AGENT"};          my $envkey = 'user.role.'.$form->{role};
     my $i;          my $now=time;
     my $clientbrowser='unknown';          my $then=$env{'user.login.time'};
     my $clientversion='0';          my $refresh=$env{'user.refresh.time'};
     my $clientmathml='';          my $update=$env{'user.update.time'};
     for ($i=0;$i<=$#browsertype;$i++) {          if (!$update) {
         my ($bname,$match,$notmatch,$vreg,$minv)=split(/\:/,$browsertype[$i]);              $update = $then;
  if (($httpbrowser=~/$match/i)  && ($httpbrowser!~/$notmatch/i)) {          }
     $clientbrowser=$bname;          if (exists($env{$envkey})) {
             $httpbrowser=~/$vreg/i;              my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
     $clientversion=$1;              &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
             $clientmathml=($clientversion>=$minv);                                           \$trolecode,\$tstatus,\$tstart,\$tend);
         }              if ($tstatus eq 'is') {
     }                  $destination  .= ($destination =~ /\?/) ? '&' : '?';
     my $clientos='unknown';                  my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
     if (($httpbrowser=~/linux/i) ||                  $destination .= 'selectrole=1&'.$newrole.'=1';
         ($httpbrowser=~/unix/i) ||              }
         ($httpbrowser=~/ux/i) ||          }
         ($httpbrowser=~/solaris/i)) { $clientos='unix'; }      }
     if (($httpbrowser=~/vax/i) ||      if (defined($form->{symb})) {
         ($httpbrowser=~/vms/i)) { $clientos='vms'; }          my $destsymb = $form->{symb};
     if ($httpbrowser=~/next/i) { $clientos='next'; }          $destination  .= ($destination =~ /\?/) ? '&' : '?';
     if (($httpbrowser=~/mac/i) ||          if ($destsymb =~ /___/) {
         ($httpbrowser=~/powerpc/i)) { $clientos='mac'; }              # FIXME Need to deal with encrypted symbs and urls as needed.
     if ($httpbrowser=~/win/i) { $clientos='win'; }              my ($map,$resid,$desturl)=split(/___/,$destsymb);
     if ($httpbrowser=~/embed/i) { $clientos='pda'; }              $desturl = &Apache::lonnet::clutter($desturl);
               $desturl = &HTML::Entities::encode($desturl,'"<>&');
 # ------------------------------------------------------------- Get environment              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
               $destination .= 'destinationurl='.$desturl.
     my $userenv=Apache::lonnet::reply("dump:$domain:$username:environment",                              '&destsymb='.$destsymb;
                                       $authhost);          } else {
     if (($userenv eq 'con_lost') ||               $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
         ($userenv =~ /^error\:/)) {              $destination .= 'destinationurl='.$destsymb;
         $userenv='';          }
     }      }
     $userenv=~s/\&/\nenvironment\./g;      if ($destination =~ m{^/adm/roles}) {
     if ($userenv ne '') {          $destination  .= ($destination =~ /\?/) ? '&' : '?';
  $userenv='environment.'.$userenv;          $destination .= 'source=login';
     }      }
 # --------------------------------------------------------- Write first profile  
       my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
        {      my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
     my $idf=Apache::File->new(">$lonids/$cookie.id");      my $brcrum = [{'href' => '',
     unless (flock($idf,LOCK_EX)) {                     'text' => 'Successful Login'},];
       &Apache::lonnet::logthis("<font color=blue>WARNING: ".      my $start_page=&Apache::loncommon::start_page('Successful Login',
     'Could not obtain exclusive lock in lonauth: '.$!);                                                    $header,
       $idf->close();                                                    {'bread_crumbs' => $brcrum,});
       return 'error: '.$!;      my $end_page  =&Apache::loncommon::end_page();
     }  
             if ($userenv ne '') { print $idf "$userenv\n"; }   my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
             print $idf "user.name=$username\n";  # ------------------------------------------------- Output for successful login
             print $idf "user.domain=$domain\n";  
             print $idf "user.home=$authhost\n";      &Apache::loncommon::content_type($r,'text/html');
             print $idf "browser.type=$clientbrowser\n";      $r->header_out('Set-cookie' => $cookie);
             print $idf "browser.version=$clientversion\n";      $r->send_http_header;
             print $idf "browser.mathml=$clientmathml\n";  
             print $idf "browser.os=$clientos\n";      my %lt=&Apache::lonlocal::texthash(
             print $idf "request.course.fn=\n";         'wel' => 'Welcome',
             print $idf "request.course.uri=\n";         'pro' => 'Login problems?',
             print $idf "request.course.sec=\n";         );
             print $idf "request.role=cm\n";      my $loginhelp = &loginhelpdisplay($domain);
             print $idf "request.host=$ENV{'HTTP_HOST'}\n";       if ($loginhelp) {
             if ($userroles ne '') { print $idf "$userroles"; }          $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
     $idf->close();      }
         }  
          $ENV{'request.role'}='cm';      my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
          $ENV{'browser.type'}=$clientbrowser;      $r->print(<<ENDSUCCESS);
 # -------------------------------------------------------------------- Log this  $start_page
   $windowinfo
     &Apache::lonnet::log($domain,$username,$authhost,  <h1>$lt{'wel'}</h1>
                          "Login $ENV{'REMOTE_ADDR'}");  $welcome
   $loginhelp
 # ------------------------------------------------- Check for critical messages  $continuelink
   $end_page
     my @what=&Apache::lonnet::dump('critical',$domain,$username);  ENDSUCCESS
     if ($what[0]) {      return;
  if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {  }
     $lowerurl='/adm/email?critical=display';  
         }  # --------------------------------------------------------------- Failed login!
     }  
   sub failed {
 # ------------------------------------------------------------ Get cookie ready      my ($r,$message,$form) = @_;
       (undef,undef,undef,my $clientmathml,my $clientunicode) =
     $cookie="lonID=$cookie; path=/";          &Apache::loncommon::decode_user_agent();
 # -------------------------------------------------------- Menu script and info      my $args = {};
     my $windowinfo=&Apache::lonmenu::open($clientos);      if ($clientunicode && !$clientmathml) {
 # ------------------------------------------------------------- Info for Remote          $args = {'browser.unicode' => 1};
     my $configmenu=&Apache::lonmenu::rawconfig($r);      }
 # ------------------------------------------------- Output for successful login  
       my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
     $r->send_cgi_header(<<ENDHEADER);      my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
 Content-type: text/html      my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
 Set-cookie: $cookie      if (&Apache::lonnet::domain($udom,'description') eq '') {
           undef($udom);
 ENDHEADER      }
     $r->print(<<ENDSUCCESS);      my $retry = '/adm/login';
 <html>      if ($uname eq $form->{'uname'}) {
 <head>          $retry .= '?username='.$uname;
 <title>Successful Login to the LearningOnline Network with CAPA</title>      }
 <script>      if ($udom) {
           $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;
 // --------------------------------------------- Checks if server frame defined      }
       if (exists($form->{role})) {
 function checkdef() {          my $role = &Apache::loncommon::cleanup_html($form->{role});
    if ((menuloaded==0) && (tim==0)) { setTimeout('checkdef()',100); }          if ($role ne '') {
 }              $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;
           }
 // ---------------------------------------------------------- The wait function      }
 var canceltim;      if (exists($form->{symb})) {
 function wait() {          my $symb = &Apache::loncommon::cleanup_html($form->{symb});
    if ((menuloaded==1) || (tim==1)) {          if ($symb ne '') {
       if (tim==0) {              $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;
          clearTimeout(canceltim);          }
          $configmenu      }
          window.location='$lowerurl';        my $end_page = &Apache::loncommon::end_page();
       } else {      &Apache::loncommon::content_type($r,'text/html');
          alert("Remote Control Timed Out.");      $r->send_http_header;
       }      my @actions =
    } else {           (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
       setTimeout('wait();',100);      my $loginhelp = &loginhelpdisplay($udom);
    }      if ($loginhelp) {
 }          push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
       }
 function main() {      #FIXME: link to helpdesk might be added here
    canceltim=setTimeout('tim=1;',80000);  
    checkdef();      $r->print(
    wait();         $start_page
 }        .'<h2>'.&mt('Sorry ...').'</h2>'
         .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
 </script>        .&Apache::lonhtmlcommon::actionbox(\@actions)
 </head>        .$end_page
 <body bgcolor="#FFFFFF">      );
 <script>   }
     menuloaded=0;  
     tim=0;  # ------------------------------------------------------------------ Rerouting!
 </script>  
 $windowinfo  sub reroute {
 <h1>Welcome!</h1>      my ($r) = @_;
 <script>      &Apache::loncommon::content_type($r,'text/html');
     main();      $r->send_http_header;
 </script>      my $msg='<b>'.&mt('Sorry ...').'</b><br />'
 </body>             .&mt('Please [_1]log in again[_2].');
 </html>      &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
 ENDSUCCESS  }
 }  
   # ---------------------------------------------------------------- Main handler
 # --------------------------------------------------------------- Failed login!  
   sub handler {
 sub failed {      my $r = shift;
     my ($r,$message) = @_;      my $londocroot = $r->dir_config('lonDocRoot');
     $r->send_cgi_header(<<ENDFHEADER);      my $form;
 Content-type: text/html  # Are we re-routing?
       if (-e "$londocroot/lon-status/reroute.txt") {
 ENDFHEADER   &reroute($r);
     $r->print(<<ENDFAILED);   return OK;
 <html>      }
 <head>  
 <title>Unsuccessful Login to the LearningOnline Network with CAPA</title>      &Apache::lonlocal::get_language_handle($r);
 </head>  
 <html>  # -------------------------------- Prevent users from attempting to login twice
 <body bgcolor="#FFFFFF">      my $handle = &Apache::lonnet::check_for_valid_session($r);
 <h1>Sorry ...</h1>      if ($handle ne '') {
 <h2>$message to use the Learning<i>Online</i> Network with CAPA</h2>          my $lonidsdir=$r->dir_config('lonIDsDir');
 </body>          if ($handle=~/^publicuser\_/) {
 </html>  # For "public user" - remove it, we apparently really want to login
 ENDFAILED              unlink($r->dir_config('lonIDsDir')."/$handle.id");
 }          } else {
   # Indeed, a valid token is found
 # ---------------------------------------------------------------- Main handler              &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
       &Apache::loncommon::content_type($r,'text/html');
 sub handler {      $r->send_http_header;
     my $r = shift;      my $start_page =
           &Apache::loncommon::start_page('Already logged in');
     my $buffer;      my $end_page =
     $r->read($buffer,$r->header_in('Content-length'));          &Apache::loncommon::end_page();
     my @pairs=split(/&/,$buffer);              my $dest = '/adm/roles';
     my $pair; my $name; my $value; my %FORM;              if ($env{'form.firsturl'} ne '') {
     foreach $pair (@pairs) {                  $dest = $env{'form.firsturl'};
        ($name,$value) = split(/=/,$pair);              }
        $value =~ tr/+/ /;              $r->print(
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;                 $start_page
        $FORM{$name}=$value;                .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
     }                 .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
                       ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
     if ((!$FORM{'uname'}) || (!$FORM{'upass'}) || (!$FORM{'udom'})) {                .'</p>'
  failed($r,'Username, password and domain need to be specified');                .$end_page
         return OK;              );
     }              return OK;
     $FORM{'uname'} =~ s/\W//g;          }
     $FORM{'udom'}  =~ s/\W//g;      }
   
     my $role   = $r->dir_config('lonRole');  # ---------------------------------------------------- No valid token, continue
     my $domain = $r->dir_config('lonDefDomain');  
     my $prodir = $r->dir_config('lonUsersDir');  
       my $buffer;
 # ---------------------------------------- Get the information from login token      if ($r->header_in('Content-length') > 0) {
    $r->read($buffer,$r->header_in('Content-length'),0);
     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$FORM{'logtoken'},      }
                                       $FORM{'serverid'});      my %form;
       foreach my $pair (split(/&/,$buffer)) {
     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {         my ($name,$value) = split(/=/,$pair);
  failed($r,'Login token missing, inaccessible or expired');         $value =~ tr/+/ /;
         return OK;         $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
     }         $form{$name}=$value;
           }
     my ($key,$firsturl)=split(/&/,$tmpinfo);  
       if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
     my $keybin=pack("H16",$key);   &failed($r,'Username, password and domain need to be specified.',
    \%form);
     my $cipher;          return OK;
     if ($Crypt::DES::VERSION>=2.03) {      }
  $cipher=new Crypt::DES $keybin;  
     }  # split user logging in and "su"-user
     else {  
  $cipher=new DES $keybin;      ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
     }      $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
       $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
     my $upass=$cipher->decrypt(      $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
        unpack("a8",pack("H16",substr($FORM{'upass'},0,16))));  
       my $role   = $r->dir_config('lonRole');
     $upass.=$cipher->decrypt(      my $domain = $r->dir_config('lonDefDomain');
        unpack("a8",pack("H16",substr($FORM{'upass'},16,16))));      my $prodir = $r->dir_config('lonUsersDir');
       my $contact_name = &mt('LON-CAPA helpdesk');
     $upass=substr($upass,1,ord(substr($upass,0,1)));  
   # ---------------------------------------- Get the information from login token
 # ---------------------------------------------------------------- Authenticate  
     my $authhost=Apache::lonnet::authenticate($FORM{'uname'},      my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
                                               $upass,                                        $form{'serverid'});
                                               $FORM{'udom'});  
           if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
 # --------------------------------------------------------------------- Failed?          ($tmpinfo eq 'no_such_host')) {
    &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
     if ($authhost eq 'no_host') {          return OK;
  failed($r,'Username and/or password could not be authenticated');      } else {
         return OK;   my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
     }     $form{'serverid'});
           if ( $reply ne 'ok' ) {
     if (($firsturl eq '') || ($firsturl eq '/adm/logout')) {              &failed($r,'Session could not be opened.',\%form);
  $firsturl='/adm/roles';      &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
     }      return OK;
    }
     success($r,$FORM{'uname'},$FORM{'udom'},$authhost,$firsturl);      }
     return OK;  
 }      if (!&Apache::lonnet::domain($form{'udom'})) {
           &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
 1;          return OK;
 __END__      }
   
       my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
       if ($rolestr) {
           $rolestr = &unescape($rolestr);
       }
       if ($symbstr) {
           $symbstr= &unescape($symbstr);
       }
       if ($iptokenstr) {
           $iptokenstr = &unescape($iptokenstr);
       }
       if ($rolestr =~ /^role=/) {
           (undef,$form{'role'}) = split('=',$rolestr);
       }
       if ($symbstr =~ /^symb=/) {
           (undef,$form{'symb'}) = split('=',$symbstr);
       }
       if ($iptokenstr =~ /^iptoken=/) {
           (undef,$form{'iptoken'}) = split('=',$iptokenstr);
       }
   
       my $upass = $ENV{HTTPS} ? join("", @form{qw(upass0 upass1 upass2)})
           : decrypt($key, @form{qw(upass0 upass1 upass2)});
   
   # ---------------------------------------------------------------- Authenticate
   
       my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
       my ($cancreate,$statustocreate) =
           &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
       my $defaultauth;
       if (ref($cancreate) eq 'ARRAY') {
           if (grep(/^login$/,@{$cancreate})) {
               $defaultauth = 1;
           }
       }
       my $clientcancheckhost = 1;
       my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
                                                 $form{'udom'},$defaultauth,
                                                 $clientcancheckhost);
      
   # --------------------------------------------------------------------- Failed?
   
       if ($authhost eq 'no_host') {
    &failed($r,'Username and/or password could not be authenticated.',
    \%form);
           return OK;
       } elsif ($authhost eq 'no_account_on_host') {
           if ($defaultauth) {
               my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
               unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
                   return OK;
               }
               my $start_page =
                   &Apache::loncommon::start_page('Create a user account in LON-CAPA');
               my $lonhost = $r->dir_config('lonHostID');
               my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
               my $contacts =
                   &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
                                                           $form{'udom'},$origmail);
               my ($contact_email) = split(',',$contacts);
               my $output =
                   &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
                                                          $domdesc,'',$lonhost,
                                                          $contact_email,$contact_name,
                                                          undef,$statustocreate);
               &Apache::loncommon::content_type($r,'text/html');
               $r->send_http_header;
               &Apache::createaccount::print_header($r,$start_page);
               $r->print('<h3>'.&mt('Account creation').'</h3>'.
                         &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
                         $output.&Apache::loncommon::end_page());
               return OK;
           } else {
               &failed($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);
               return OK;
           }
       }
   
       if (($firsturl eq '') ||
    ($firsturl=~/^\/adm\/(logout|remote)/)) {
    $firsturl='/adm/roles';
       }
   
       my $hosthere;
       if ($form{'iptoken'}) {
           my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
           my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
           if (($sessiondata{'domain'} eq $form{'udom'}) &&
               ($sessiondata{'username'} eq $form{'uname'})) {
               $hosthere = 1;
           }
       }
   
   # --------------------------------- Are we attempting to login as somebody else?
       if ($form{'suname'}) {
   # ------------ see if the original user has enough privileges to pull this stunt
    if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
   # ---------------------------------------------------- see if the su-user exists
       unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
    eq 'no_host') {
    &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
   # ------------------------------ see if the su-user is not too highly privileged
    unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
   # -------------------------------------------------------- actually switch users
       &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
    ' logging in as '.$form{'suname'});
       $form{'uname'}=$form{'suname'};
    } else {
       &Apache::lonnet::logthis('Attempted switch user to privileged user');
    }
       }
    } else {
       &Apache::lonnet::logthis('Non-privileged user attempting switch user');
    }
       }
   
       my ($is_balancer,$otherserver);
   
       unless ($hosthere) {
           ($is_balancer,$otherserver) =
               &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
       }
   
       if ($is_balancer) {
           if (!$otherserver) {
               ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
           }
           if ($otherserver) {
               &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                        \%form);
               my $switchto = '/adm/switchserver?otherserver='.$otherserver;
               if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
                   $switchto .= '&origurl='.$firsturl;
               }
               if ($form{'role'}) {
                   $switchto .= '&role='.$form{'role'};
               }
               if ($form{'symb'}) {
                   $switchto .= '&symb='.$form{'symb'};
               }
               $r->internal_redirect($switchto);
           } else {
               $r->print(&noswitch());
           }
           return OK;
       } else {
           if (!&check_can_host($r,\%form,$authhost)) {
               my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
               if ($otherserver) {
                   &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                            \%form);
                   my $switchto = '/adm/switchserver?otherserver='.$otherserver;
                   if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
                       $switchto .= '&origurl='.$firsturl;
                   }
                   if ($form{'role'}) {
                       $switchto .= '&role='.$form{'role'};
                   }
                   if ($form{'symb'}) {
                       $switchto .= '&symb='.$form{'symb'};
                   }
                   $r->internal_redirect($switchto);
               } else {
                   $r->print(&noswitch());
               }
               return OK;
           }
   
   # ------------------------------------------------------- Do the load balancing
   
   # ---------------------------------------------------------- Determine own load
           my $loadlim = $r->dir_config('lonLoadLim');
           my $loadavg;
           {
               my $loadfile=Apache::File->new('/proc/loadavg');
               $loadavg=<$loadfile>;
           }
           $loadavg =~ s/\s.*//g;
           my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
           my $userloadpercent=&Apache::lonnet::userload();
   
   # ---------------------------------------------------------- Are we overloaded?
           if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
               my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
               if (!$unloaded) {
                   ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
               }
               if ($unloaded) {
                   &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
                            undef,\%form);
                   $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
                   return OK;
               }
           }
           &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
                    \%form);
           return OK;
       }
   }
   
   sub decrypt {
       my ($key, @chunks) = @_;
   
       my $keybin = pack("H16",$key);
   
       my $cipher;
       if ($Crypt::DES::VERSION >= 2.03) {
           $cipher = new Crypt::DES $keybin;
       } else {
           $cipher = new DES $keybin;
       }
   
       my $upass='';
       for (my $i=0;$i<=2;$i++) {
           my $chunk =
               $cipher->decrypt(
                   unpack("a8",pack("H16",substr($chunks[$i],0,16))));
   
           $chunk .=
               $cipher->decrypt(
                   unpack("a8",pack("H16",substr($chunks[$i],16,16))));
   
           $chunk = substr($chunk,1,ord(substr($chunk,0,1)));
           $upass .= $chunk;
       }
       return $upass;
   }
   
   sub check_can_host {
       my ($r,$form,$authhost,$domdesc) = @_;
       return unless (ref($form) eq 'HASH');
       my $canhost = 1;
       my $lonhost = $r->dir_config('lonHostID');
       my $udom = $form->{'udom'};
       my @intdoms;
       my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
       if (ref($internet_names) eq 'ARRAY') {
           @intdoms = @{$internet_names};
       }
       my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
       my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
       unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
           my $machine_dom = &Apache::lonnet::host_domain($lonhost);
           my $hostname = &Apache::lonnet::hostname($lonhost);
           my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
           my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
           my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
           my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
           my $loncaparev;
           if ($authhost eq 'no_account_on_host') {
               $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
           } else {
               $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
           }
           $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
                                                        $udomdefaults{'remotesessions'},
                                                        $defdomdefaults{'hostedsessions'});
       }
       unless ($canhost) {
           if ($authhost eq 'no_account_on_host') {
               my $checkloginvia = 1;
               my ($login_host,$hostname) =
                   &Apache::lonnet::choose_server($udom,$checkloginvia);
               &Apache::loncommon::content_type($r,'text/html');
               $r->send_http_header;
               if ($login_host ne '') {
                   my $protocol = $Apache::lonnet::protocol{$login_host};
                   $protocol = 'http' if ($protocol ne 'https');
                   my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
                   $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
                             '<h3>'.&mt('Account creation').'</h3>'.
                             &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                             '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
                             '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
                             &Apache::loncommon::end_page());
               } else {
                   $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                             '<h3>'.&mt('Account creation unavailable').'</h3>'.
                             &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                             '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
                             &Apache::loncommon::end_page());
               }
           } else {
               &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
                        $form);
               my ($otherserver) = &Apache::lonnet::choose_server($udom);
               $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
           }
       }
       return $canhost;
   }
   
   sub noswitch {
       my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                    '<h3>'.&mt('Session unavailable').'</h3>'.
                    &mt('This LON-CAPA server is unable to host your session.').'<br />'.
                    '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
                    &Apache::loncommon::end_page();
       return $result;
   }
   
   sub loginhelpdisplay {
       my ($authdomain) = @_;
       my $login_help = 1;
       my $lang = &Apache::lonlocal::current_language();
       if ($login_help) {
           my $dom = $authdomain;
           if ($dom eq '') {
               $dom = &Apache::lonnet::default_login_domain();
           }
           my %domconfhash = &Apache::loncommon::get_domainconf($dom);
           my $loginhelp_url;
           if ($lang) {
               $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
               if ($loginhelp_url ne '') {
                   return $loginhelp_url;
               }
           }
           $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
           if ($loginhelp_url ne '') {
               return $loginhelp_url;
           } else {
               return '/adm/loginproblems.html';
           }
       }
       return;
   }
   
   1;
   __END__
   
   
Removed from v.1.31  
changed lines
  Added in v.1.138

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