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Diff for /loncom/auth/lonauth.pm between versions 1.54 and 1.142

version 1.54, 2003/07/17 15:24:46 version 1.142, 2017/02/17 14:34:21
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 qw(:DEFAULT :match);
 # 07/28,08/03 Gerd Kortemeyer  use Apache::Constants qw(:common);
 # 8/20 Gerd Kortemeyer  use CGI qw(:standard);
   use DynaLoader; # for Crypt::DES version
 package Apache::lonauth;  use Crypt::DES;
   use Apache::loncommon();
 use strict;  use Apache::lonnet;
 use Apache::Constants qw(:common);  use Apache::lonmenu();
 use Apache::File;  use Apache::createaccount;
 use CGI qw(:standard);  use Fcntl qw(:flock);
 use CGI::Cookie();  use Apache::lonlocal;
 use DynaLoader; # for Crypt::DES version  use Apache::File();
 use Crypt::DES;  use HTML::Entities;
 use Apache::loncommon();   
 use Apache::lonnet();  # ------------------------------------------------------------ Successful login
 use Apache::lonmenu();  sub success {
 use Fcntl qw(:flock);      my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
    $form) = @_;
 my %FORM;  
   # ------------------------------------------------------------ Get cookie ready
 # ------------------------------------------------------------ Successful login      my $cookie =
    &Apache::loncommon::init_user_environment($r, $username, $domain,
 sub success {    $authhost, $form,
     my ($r, $username, $domain, $authhost,$lowerurl) = @_;    {'extra_env' => $extra_env,});
     my $lonids=$r->dir_config('lonIDsDir');  
       my $public=($username eq 'public' && $domain eq 'public');
 # See if old ID present, if so, remove  
       if ($public or $lowerurl eq 'noredirect') { return $cookie; }
     my $filename;  
     opendir(DIR,$lonids);  # -------------------------------------------------------------------- Log this
     while ($filename=readdir(DIR)) {  
        if ($filename=~/^$username\_\d+\_$domain\_$authhost\.id$/) {      &Apache::lonnet::log($domain,$username,$authhost,
   unlink($lonids.'/'.$filename);                           "Login $ENV{'REMOTE_ADDR'}");
        }  
     }  # ------------------------------------------------- Check for critical messages
     closedir(DIR);  
       my @what=&Apache::lonnet::dump('critical',$domain,$username);
 # Give them a new cookie      if ($what[0]) {
    if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
     my $cookie;      $lowerurl='/adm/email?critical=display';
     my $now=time;          }
     $cookie="$username\_$now\_$domain\_$authhost";      }
   
 # Initialize roles  # ------------------------------------------------------------ Get cookie ready
       $cookie="lonID=$cookie; path=/; HttpOnly";
     my $userroles=Apache::lonnet::rolesinit($domain,$username,$authhost);  # -------------------------------------------------------- Menu script and info
       my $destination = $lowerurl;
 # ------------------------------------ Check browser type and MathML capability  
       if (defined($form->{role})) {
     my ($httpbrowser,$clientbrowser,$clientversion,$clientmathml,          my $envkey = 'user.role.'.$form->{role};
         $clientunicode,$clientos) = &Apache::loncommon::decode_user_agent($r);          my $now=time;
           my $then=$env{'user.login.time'};
 # -------------------------------------- Any accessibility options to remember?          my $refresh=$env{'user.refresh.time'};
     if (($FORM{'interface'}) && ($FORM{'remember'} eq 'true')) {          my $update=$env{'user.update.time'};
  foreach ('imagesuppress','appletsuppress',          if (!$update) {
  'embedsuppress','fontenhance','blackwhite') {              $update = $then;
     if ($FORM{$_} eq 'true') {          }
  &Apache::lonnet::put('environment',{$_ => 'on'},          if (exists($env{$envkey})) {
      $domain,$username);              my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
     } else {              &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
  &Apache::lonnet::del('environment',[$_],$domain,$username);                                           \$trolecode,\$tstatus,\$tstart,\$tend);
     }              if ($tstatus eq 'is') {
  }                  $destination  .= ($destination =~ /\?/) ? '&' : '?';
     }                  my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
 # ------------------------------------------------------------- Get environment                  $destination .= 'selectrole=1&'.$newrole.'=1';
               }
     my $userenv;          }
     my %userenv=Apache::lonnet::dump('environment',$domain,$username);      }
     my ($tmp) = keys(%userenv);      if (defined($form->{symb})) {
     if ($tmp !~ /^(con_lost|error|no_such_host)/i) {          my $destsymb = $form->{symb};
  foreach my $key (keys(%userenv)) {          $destination  .= ($destination =~ /\?/) ? '&' : '?';
     $userenv.="environment.$key=$userenv{$key}\n";          if ($destsymb =~ /___/) {
  }              # FIXME Need to deal with encrypted symbs and urls as needed.
     }              my ($map,$resid,$desturl)=split(/___/,$destsymb);
     if (($userenv{'interface'}) && (!$FORM{'interface'})) {              $desturl = &Apache::lonnet::clutter($desturl);
  $FORM{'interface'}=$userenv{'interface'};              $desturl = &HTML::Entities::encode($desturl,'"<>&');
     }              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
     $ENV{'environment.remote'}=$userenv{'remote'};              $destination .= 'destinationurl='.$desturl.
 # --------------- Do not trust query string to be put directly into environment                              '&destsymb='.$destsymb;
     foreach ('imagesuppress','appletsuppress',          } else {
      'embedsuppress','fontenhance','blackwhite',              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
      'interface','localpath','localres') {              $destination .= 'destinationurl='.$destsymb;
  $FORM{$_}=~s/[\n\r\=]//gs;          }
     }      }
 # --------------------------------------------------------- Write first profile      if ($destination =~ m{^/adm/roles}) {
           $destination  .= ($destination =~ /\?/) ? '&' : '?';
     {          $destination .= 'source=login';
  my $idf=Apache::File->new(">$lonids/$cookie.id");      }
  unless (flock($idf,LOCK_EX)) {  
     &Apache::lonnet::logthis("<font color=blue>WARNING: ".      my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
    'Could not obtain exclusive lock in lonauth: '.$!);      my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
     $idf->close();      my $brcrum = [{'href' => '',
     return 'error: '.$!;                     'text' => 'Successful Login'},];
  }      my $args = {'bread_crumbs' => $brcrum,};
  if ($userenv ne '') { print $idf "$userenv\n"; }      unless ((defined($form->{role})) || (defined($form->{symb}))) {
  print $idf "user.name=$username\n";          my $update=$env{'user.update.time'};
  print $idf "user.domain=$domain\n";          if (!$update) {
  print $idf "user.home=$authhost\n";              $update = $env{'user.login.time'};
  print $idf "browser.type=$clientbrowser\n";          }
  print $idf "browser.version=$clientversion\n";          my %roles_in_env;
  print $idf "browser.mathml=$clientmathml\n";          my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
  print $idf "browser.unicode=$clientunicode\n";          if ($showcount == 1) {
  print $idf "browser.os=$clientos\n";              foreach my $rolecode (keys(%roles_in_env)) {
         if ($FORM{'localpath'}) {                  my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
            print $idf "browser.localpath=$FORM{'localpath'}\n";                  if ($cid) {
            print $idf "browser.localres=$FORM{'localres'}\n";                      my %coursedescription =
         }                          &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
  print $idf "request.course.fn=\n";                      if ($coursedescription{'type'} eq 'Placement') {
  print $idf "request.course.uri=\n";                          $args->{'crstype'} = 'Placement';
  print $idf "request.course.sec=\n";                      }
  print $idf "request.role=cm\n";                      last;
         print $idf "request.role.adv=$ENV{'user.adv'}\n";                  }
  print $idf "request.host=$ENV{'REMOTE_ADDR'}\n";              }
  if ($FORM{'interface'}) {          }
     $FORM{'interface'}=~s/\W//gs;      }
     print $idf "browser.interface=$FORM{'interface'}\n";      my $start_page=&Apache::loncommon::start_page('Successful Login',
     $ENV{'browser.interface'}=$FORM{'interface'};                                                    $header,$args);
     foreach ('imagesuppress','appletsuppress',      my $end_page  =&Apache::loncommon::end_page();
      'embedsuppress','fontenhance','blackwhite') {  
  if (($FORM{$_} eq 'true') ||   my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
     ($userenv{$_} eq 'on')) {  # ------------------------------------------------- Output for successful login
     print $idf "browser.$_=on\n";  
  }      &Apache::loncommon::content_type($r,'text/html');
     }      $r->header_out('Set-cookie' => $cookie);
  }      $r->send_http_header;
  if ($userroles ne '') { print $idf "$userroles"; }  
  $idf->close();      my %lt=&Apache::lonlocal::texthash(
     }         'wel' => 'Welcome',
     $ENV{'request.role'}='cm';         'pro' => 'Login problems?',
     $ENV{'request.role.adv'}=$ENV{'user.adv'};         );
     $ENV{'browser.type'}=$clientbrowser;      my $loginhelp = &loginhelpdisplay($domain);
 # -------------------------------------------------------------------- Log this      if ($loginhelp) {
           $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
     &Apache::lonnet::log($domain,$username,$authhost,      }
                          "Login $ENV{'REMOTE_ADDR'}");  
       my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
 # ------------------------------------------------- Check for critical messages      $r->print(<<ENDSUCCESS);
   $start_page
     my @what=&Apache::lonnet::dump('critical',$domain,$username);  $windowinfo
     if ($what[0]) {  <h1>$lt{'wel'}</h1>
  if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {  $welcome
     $lowerurl='/adm/email?critical=display';  $loginhelp
         }  $continuelink
     }  $end_page
   ENDSUCCESS
 # ------------------------------------------------------------ Get cookie ready      return;
   }
     $cookie="lonID=$cookie; path=/";  
 # -------------------------------------------------------- Menu script and info  # --------------------------------------------------------------- Failed login!
     my $windowinfo=&Apache::lonmenu::open($clientos);  
     my $startupremote=&Apache::lonmenu::startupremote($lowerurl);  sub failed {
     my $setflags=&Apache::lonmenu::setflags();      my ($r,$message,$form) = @_;
     my $maincall=&Apache::lonmenu::maincall();      (undef,undef,undef,my $clientmathml,my $clientunicode) =
     my $bodytag=&Apache::loncommon::bodytag('Successful Login');          &Apache::loncommon::decode_user_agent();
 # ------------------------------------------------- Output for successful login      my $args = {};
       if ($clientunicode && !$clientmathml) {
     $r->send_cgi_header(<<ENDHEADER);          $args = {'browser.unicode' => 1};
 Content-type: text/html      }
 Set-cookie: $cookie  
       my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
 ENDHEADER      my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
     $r->print(<<ENDSUCCESS);      my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
 <html>      if (&Apache::lonnet::domain($udom,'description') eq '') {
 <head>          undef($udom);
 <title>Successful Login to the LearningOnline Network with CAPA</title>      }
 $startupremote      my $retry = '/adm/login';
 </head>      if ($uname eq $form->{'uname'}) {
 $bodytag          $retry .= '?username='.$uname;
 $setflags      }
 $windowinfo      if ($udom) {
 <h1>Welcome!</h1>          $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;
 Welcome to the Learning<i>Online</i> Network with CAPA.      }
 Please wait while your session      if (exists($form->{role})) {
 is being set up.<p>          my $role = &Apache::loncommon::cleanup_html($form->{role});
 <a href="/adm/loginproblems.html">Problems?</a></p>          if ($role ne '') {
 $maincall              $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;
 </body>          }
 </html>      }
 ENDSUCCESS      if (exists($form->{symb})) {
 }          my $symb = &Apache::loncommon::cleanup_html($form->{symb});
           if ($symb ne '') {
 # --------------------------------------------------------------- Failed login!              $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;
           }
 sub failed {      }
     my ($r,$message) = @_;      my $end_page = &Apache::loncommon::end_page();
     my $bodytag=&Apache::loncommon::bodytag('Unsuccessful Login');      &Apache::loncommon::content_type($r,'text/html');
     $r->send_cgi_header(<<ENDFHEADER);      $r->send_http_header;
 Content-type: text/html      my @actions =
            (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
 ENDFHEADER      my $loginhelp = &loginhelpdisplay($udom);
     $r->print(<<ENDFAILED);      if ($loginhelp) {
 <html>          push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
 <head>      }
 <title>Unsuccessful Login to the LearningOnline Network with CAPA</title>      #FIXME: link to helpdesk might be added here
 </head>  
 <html>      $r->print(
 $bodytag         $start_page
 <h1>Sorry ...</h1>        .'<h2>'.&mt('Sorry ...').'</h2>'
 <p><b>$message</b></p>        .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
 <p>Please <a href="/adm/login?username=$FORM{'uname'}&domain=$FORM{'udom'}">log in again</a>.</p>        .&Apache::lonhtmlcommon::actionbox(\@actions)
 <p>        .$end_page
 <a href="/adm/loginproblems.html">Problems?</a></p>      );
 </body>   }
 </html>  
 ENDFAILED  # ------------------------------------------------------------------ Rerouting!
 }  
   sub reroute {
 # ---------------------------------------------------------------- Main handler      my ($r) = @_;
       &Apache::loncommon::content_type($r,'text/html');
 sub handler {      $r->send_http_header;
     my $r = shift;      my $msg='<b>'.&mt('Sorry ...').'</b><br />'
              .&mt('Please [_1]log in again[_2].');
     my $buffer;      &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
     $r->read($buffer,$r->header_in('Content-length'),0);  }
     my @pairs=split(/&/,$buffer);  
     my $pair; my $name; my $value;  # ---------------------------------------------------------------- Main handler
     undef %FORM;  
     %FORM=();  sub handler {
     foreach $pair (@pairs) {      my $r = shift;
        ($name,$value) = split(/=/,$pair);      my $londocroot = $r->dir_config('lonDocRoot');
        $value =~ tr/+/ /;  # Are we re-routing?
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;      if (-e "$londocroot/lon-status/reroute.txt") {
        $FORM{$name}=$value;   &reroute($r);
     }    return OK;
       }
     if ((!$FORM{'uname'}) || (!$FORM{'upass'}) || (!$FORM{'udom'})) {  
  failed($r,'Username, password and domain need to be specified.');      &Apache::lonlocal::get_language_handle($r);
         return OK;  
     }  # -------------------------------- Prevent users from attempting to login twice
     $FORM{'uname'} =~ s/\W//g;      my $handle = &Apache::lonnet::check_for_valid_session($r);
     $FORM{'udom'}  =~ s/\W//g;      if ($handle ne '') {
           my $lonidsdir=$r->dir_config('lonIDsDir');
     my $role   = $r->dir_config('lonRole');          if ($handle=~/^publicuser\_/) {
     my $domain = $r->dir_config('lonDefDomain');  # For "public user" - remove it, we apparently really want to login
     my $prodir = $r->dir_config('lonUsersDir');              unlink($r->dir_config('lonIDsDir')."/$handle.id");
           } else {
 # ---------------------------------------- Get the information from login token  # Indeed, a valid token is found
               &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$FORM{'logtoken'},      &Apache::loncommon::content_type($r,'text/html');
                                       $FORM{'serverid'});      $r->send_http_header;
       my $start_page =
     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {          &Apache::loncommon::start_page('Already logged in');
  failed($r,'Information needed to verify your login information is missing, inaccessible or expired.');      my $end_page =
         return OK;          &Apache::loncommon::end_page();
     } else {              my $dest = '/adm/roles';
         unless (&Apache::lonnet::reply('tmpdel:'.$FORM{'logtoken'},              if ($env{'form.firsturl'} ne '') {
                                          $FORM{'serverid'}) eq 'ok') {                  $dest = $env{'form.firsturl'};
             &failed($r,'Session could not be opened.');              }
  }              $r->print(
     }                 $start_page
     my ($key,$firsturl)=split(/&/,$tmpinfo);                .'<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].'
     my $keybin=pack("H16",$key);                      ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
                 .'</p>'
     my $cipher;                .$end_page
     if ($Crypt::DES::VERSION>=2.03) {              );
  $cipher=new Crypt::DES $keybin;              return OK;
     }          }
     else {      }
  $cipher=new DES $keybin;  
     }  # ---------------------------------------------------- No valid token, continue
   
     my $upass=$cipher->decrypt(  
        unpack("a8",pack("H16",substr($FORM{'upass'},0,16))));      my $buffer;
       if ($r->header_in('Content-length') > 0) {
     $upass.=$cipher->decrypt(   $r->read($buffer,$r->header_in('Content-length'),0);
        unpack("a8",pack("H16",substr($FORM{'upass'},16,16))));      }
       my %form;
     $upass=substr($upass,1,ord(substr($upass,0,1)));      foreach my $pair (split(/&/,$buffer)) {
          my ($name,$value) = split(/=/,$pair);
 # ---------------------------------------------------------------- Authenticate         $value =~ tr/+/ /;
     my $authhost=Apache::lonnet::authenticate($FORM{'uname'},         $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                                               $upass,         $form{$name}=$value;
                                               $FORM{'udom'});      }
       
 # --------------------------------------------------------------------- Failed?      if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
    &failed($r,'Username, password and domain need to be specified.',
     if ($authhost eq 'no_host') {   \%form);
  failed($r,'Username and/or password could not be authenticated.');          return OK;
         return OK;      }
     }  
   # split user logging in and "su"-user
     if (($firsturl eq '') || ($firsturl eq '/adm/logout')) {  
  $firsturl='/adm/roles';      ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
     }      $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
       $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
     success($r,$FORM{'uname'},$FORM{'udom'},$authhost,$firsturl);      $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
     return OK;  
 }      my $role   = $r->dir_config('lonRole');
       my $domain = $r->dir_config('lonDefDomain');
 1;      my $prodir = $r->dir_config('lonUsersDir');
 __END__      my $contact_name = &mt('LON-CAPA helpdesk');
   
   # ---------------------------------------- Get the information from login token
   
       my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
                                         $form{'serverid'});
   
       if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
           ($tmpinfo eq 'no_such_host')) {
    &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
           return OK;
       } else {
    my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
      $form{'serverid'});
           if ( $reply ne 'ok' ) {
               &failed($r,'Session could not be opened.',\%form);
       &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
       return OK;
    }
       }
   
       if (!&Apache::lonnet::domain($form{'udom'})) {
           &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
           return OK;
       }
   
       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} ? $form{'upass0'}
           : &Apache::loncommon::des_decrypt($key,$form{'upass0'});
   
   # ---------------------------------------------------------------- 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'},$form{'udom'},'login');
           if ($is_balancer) {
               if ($otherserver eq '') {
                   my $lowest_load;
                   ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
                   if ($lowest_load > 100) {
                       $otherserver = &Apache::lonnet::spareserver($lowest_load,$lowest_load,1,$form{'udom'});
                   }
               }
               if ($otherserver ne '') {
                   my @hosts = &Apache::lonnet::current_machine_ids();
                   if (grep(/^\Q$otherserver\E$/,@hosts)) {
                       $hosthere = $otherserver;
                   }
               }
           }
       }
   
       if (($is_balancer) && (!$hosthere)) {
           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='.$firsturl);
                   return OK;
               }
           }
           if (($is_balancer) && ($hosthere)) {
               $form{'noloadbalance'} = $hosthere;
           }
           &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
                    \%form);
           return OK;
       }
   }
   
   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.1.54  
changed lines
  Added in v.1.142

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