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Diff for /loncom/auth/lonauth.pm between versions 1.95 and 1.142

version 1.95, 2008/10/01 11:11:08 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/
 #  #
   
 package Apache::lonauth;  package Apache::lonauth;
   
 use strict;  use strict;
 use LONCAPA;  use LONCAPA qw(:DEFAULT :match);
 use Apache::Constants qw(:common);  use Apache::Constants qw(:common);
 use CGI qw(:standard);  use CGI qw(:standard);
 use DynaLoader; # for Crypt::DES version  use DynaLoader; # for Crypt::DES version
 use Crypt::DES;  use Crypt::DES;
 use Apache::loncommon();  use Apache::loncommon();
 use Apache::lonnet;  use Apache::lonnet;
 use Apache::lonmenu();  use Apache::lonmenu();
 use Apache::createaccount;  use Apache::createaccount;
 use Fcntl qw(:flock);  use Fcntl qw(:flock);
 use Apache::lonlocal;  use Apache::lonlocal;
    use Apache::File();
 # ------------------------------------------------------------ Successful login  use HTML::Entities;
 sub success {   
     my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,  # ------------------------------------------------------------ Successful login
  $form) = @_;  sub success {
       my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
 # ------------------------------------------------------------ Get cookie ready   $form) = @_;
     my $cookie =  
  &Apache::loncommon::init_user_environment($r, $username, $domain,  # ------------------------------------------------------------ Get cookie ready
   $authhost, $form,      my $cookie =
   {'extra_env' => $extra_env,});   &Apache::loncommon::init_user_environment($r, $username, $domain,
     $authhost, $form,
     my $public=($username eq 'public' && $domain eq 'public');    {'extra_env' => $extra_env,});
   
     if ($public or $lowerurl eq 'noredirect') { return $cookie; }      my $public=($username eq 'public' && $domain eq 'public');
   
 # -------------------------------------------------------------------- Log this      if ($public or $lowerurl eq 'noredirect') { return $cookie; }
   
     &Apache::lonnet::log($domain,$username,$authhost,  # -------------------------------------------------------------------- Log this
                          "Login $ENV{'REMOTE_ADDR'}");  
       &Apache::lonnet::log($domain,$username,$authhost,
 # ------------------------------------------------- Check for critical messages                           "Login $ENV{'REMOTE_ADDR'}");
   
     my @what=&Apache::lonnet::dump('critical',$domain,$username);  # ------------------------------------------------- Check for critical messages
     if ($what[0]) {  
  if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {      my @what=&Apache::lonnet::dump('critical',$domain,$username);
     $lowerurl='/adm/email?critical=display';      if ($what[0]) {
         }   if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
     }      $lowerurl='/adm/email?critical=display';
           }
 # ------------------------------------------------------------ Get cookie ready      }
     $cookie="lonID=$cookie; path=/";  
 # -------------------------------------------------------- Menu script and info  # ------------------------------------------------------------ Get cookie ready
     my $windowinfo=&Apache::lonmenu::open($env{'browser.os'});      $cookie="lonID=$cookie; path=/; HttpOnly";
     my $startupremote=&Apache::lonmenu::startupremote($lowerurl);  # -------------------------------------------------------- Menu script and info
     my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);      my $destination = $lowerurl;
     my $setflags=&Apache::lonmenu::setflags();  
     my $maincall=&Apache::lonmenu::maincall();      if (defined($form->{role})) {
     my $start_page=&Apache::loncommon::start_page('Successful Login',          my $envkey = 'user.role.'.$form->{role};
   $startupremote,          my $now=time;
   {'no_inline_link' => 1,});          my $then=$env{'user.login.time'};
     my $end_page  =&Apache::loncommon::end_page();          my $refresh=$env{'user.refresh.time'};
           my $update=$env{'user.update.time'};
     my $continuelink;          if (!$update) {
     if (($env{'browser.interface'} eq 'textual') ||              $update = $then;
         ($env{'environment.remote'} eq 'off')) {          }
  $continuelink="<a href=\"$lowerurl\">".&mt('Continue')."</a>";          if (exists($env{$envkey})) {
     }              my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
 # ------------------------------------------------- Output for successful login              &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
                                            \$trolecode,\$tstatus,\$tstart,\$tend);
     &Apache::loncommon::content_type($r,'text/html');              if ($tstatus eq 'is') {
     $r->header_out('Set-cookie' => $cookie);                  $destination  .= ($destination =~ /\?/) ? '&' : '?';
     $r->send_http_header;                  my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
                   $destination .= 'selectrole=1&'.$newrole.'=1';
     my %lt=&Apache::lonlocal::texthash(              }
        'wel' => 'Welcome',          }
        'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up.',      }
        'pro' => 'Login problems?',      if (defined($form->{symb})) {
        'log' => 'loginproblems.html',          my $destsymb = $form->{symb};
        );          $destination  .= ($destination =~ /\?/) ? '&' : '?';
     $r->print(<<ENDSUCCESS);          if ($destsymb =~ /___/) {
 $start_page              # FIXME Need to deal with encrypted symbs and urls as needed.
 $setflags              my ($map,$resid,$desturl)=split(/___/,$destsymb);
 $windowinfo              $desturl = &Apache::lonnet::clutter($desturl);
 <h1>$lt{'wel'}</h1>              $desturl = &HTML::Entities::encode($desturl,'"<>&');
 $lt{'mes'}<p>              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
 <a href="/adm/$lt{'log'}">$lt{'pro'}</a></p>              $destination .= 'destinationurl='.$desturl.
 $remoteinfo                              '&destsymb='.$destsymb;
 $maincall          } else {
 $continuelink              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
 $end_page              $destination .= 'destinationurl='.$destsymb;
 ENDSUCCESS          }
 }      }
       if ($destination =~ m{^/adm/roles}) {
 # --------------------------------------------------------------- Failed login!          $destination  .= ($destination =~ /\?/) ? '&' : '?';
           $destination .= 'source=login';
 sub failed {      }
     my ($r,$message,$form) = @_;  
     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,      my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
     {'no_inline_link' => 1,});      my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
     my $end_page   = &Apache::loncommon::end_page();      my $brcrum = [{'href' => '',
     &Apache::loncommon::content_type($r,'text/html');                     'text' => 'Successful Login'},];
     sleep 1; # brute force counteraction: slow down attackers, which try to hack user authentication with automated scripts      my $args = {'bread_crumbs' => $brcrum,};
     $r->send_http_header;      unless ((defined($form->{role})) || (defined($form->{symb}))) {
     $r->print(          my $update=$env{'user.update.time'};
        $start_page          if (!$update) {
       .'<h1>'.&mt('Sorry ...').'</h1>'              $update = $env{'user.login.time'};
       .'<p class="LC_warning">'.&mt($message).'</p>'          }
       .'<p>'.&mt('Please [_1]log in again[_2].'          my %roles_in_env;
                 ,"<a href=\"/adm/login?username=$form->{'uname'}&domain=$form->{'udom'}\">",'</a>')          my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
       .'</p>'          if ($showcount == 1) {
       .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'              foreach my $rolecode (keys(%roles_in_env)) {
       .$end_page                  my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
     );                  if ($cid) {
  }                      my %coursedescription =
                           &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
 # ------------------------------------------------------------------ Rerouting!                      if ($coursedescription{'type'} eq 'Placement') {
                           $args->{'crstype'} = 'Placement';
 sub reroute {                      }
     my ($r) = @_;                      last;
     &Apache::loncommon::content_type($r,'text/html');                  }
     $r->send_http_header;              }
     my $msg='<h1>'.&mt('Sorry ...').'</h1>'          }
            .&mt('Please [_1]log in again[_2].');      }
     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);      my $start_page=&Apache::loncommon::start_page('Successful Login',
 }                                                    $header,$args);
       my $end_page  =&Apache::loncommon::end_page();
 # ---------------------------------------------------------------- Main handler  
    my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
 sub handler {  # ------------------------------------------------- Output for successful login
     my $r = shift;  
     my $form;      &Apache::loncommon::content_type($r,'text/html');
 # Are we re-routing?      $r->header_out('Set-cookie' => $cookie);
     if (-e '/home/httpd/html/lon-status/reroute.txt') {      $r->send_http_header;
  &reroute($r);  
  return OK;      my %lt=&Apache::lonlocal::texthash(
     }         'wel' => 'Welcome',
          'pro' => 'Login problems?',
     &Apache::lonlocal::get_language_handle($r);         );
       my $loginhelp = &loginhelpdisplay($domain);
 # -------------------------------- Prevent users from attempting to login twice      if ($loginhelp) {
     my $handle = &Apache::lonnet::check_for_valid_session($r);          $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
     if ($handle ne '') {      }
 # Indeed, a valid token is found  
  &Apache::loncommon::content_type($r,'text/html');      my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
  $r->send_http_header;      $r->print(<<ENDSUCCESS);
  my $start_page =   $start_page
     &Apache::loncommon::start_page('Already logged in');  $windowinfo
  my $end_page =   <h1>$lt{'wel'}</h1>
     &Apache::loncommon::end_page();  $welcome
         $r->print(  $loginhelp
            $start_page  $continuelink
           .'<h1>'.&mt('You are already logged in!').'</h1>'  $end_page
           .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]logout[_4].'  ENDSUCCESS
                     ,'<a href="/adm/roles">','</a>','<a href="/adm/logout">','</a>')      return;
           .'</p>'  }
           .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'  
           .$end_page  # --------------------------------------------------------------- Failed login!
         );  
         return OK;  sub failed {
     }      my ($r,$message,$form) = @_;
       (undef,undef,undef,my $clientmathml,my $clientunicode) =
 # ---------------------------------------------------- No valid token, continue          &Apache::loncommon::decode_user_agent();
       my $args = {};
       if ($clientunicode && !$clientmathml) {
     my $buffer;          $args = {'browser.unicode' => 1};
     if ($r->header_in('Content-length') > 0) {      }
  $r->read($buffer,$r->header_in('Content-length'),0);  
     }      my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
     my %form;      my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
     foreach my $pair (split(/&/,$buffer)) {      my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
        my ($name,$value) = split(/=/,$pair);      if (&Apache::lonnet::domain($udom,'description') eq '') {
        $value =~ tr/+/ /;          undef($udom);
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;      }
        $form{$name}=$value;      my $retry = '/adm/login';
     }       if ($uname eq $form->{'uname'}) {
           $retry .= '?username='.$uname;
     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {      }
  &failed($r,'Username, password and domain need to be specified.',      if ($udom) {
  \%form);          $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;
         return OK;      }
     }      if (exists($form->{role})) {
           my $role = &Apache::loncommon::cleanup_html($form->{role});
 # split user logging in and "su"-user          if ($role ne '') {
               $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;
     ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});          }
     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});      }
     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});      if (exists($form->{symb})) {
     $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});          my $symb = &Apache::loncommon::cleanup_html($form->{symb});
           if ($symb ne '') {
     my $role   = $r->dir_config('lonRole');              $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;
     my $domain = $r->dir_config('lonDefDomain');          }
     my $prodir = $r->dir_config('lonUsersDir');      }
     my $contact_name = &mt('LON-CAPA helpdesk');      my $end_page = &Apache::loncommon::end_page();
       &Apache::loncommon::content_type($r,'text/html');
 # ---------------------------------------- Get the information from login token      $r->send_http_header;
       my @actions =
     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},           (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
                                       $form{'serverid'});      my $loginhelp = &loginhelpdisplay($udom);
       if ($loginhelp) {
     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {          push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
  &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);      }
         return OK;      #FIXME: link to helpdesk might be added here
     } else {  
  my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},      $r->print(
    $form{'serverid'});         $start_page
         if ( $reply ne 'ok' ) {        .'<h2>'.&mt('Sorry ...').'</h2>'
             &failed($r,'Session could not be opened.',\%form);        .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
     &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");        .&Apache::lonhtmlcommon::actionbox(\@actions)
     return OK;        .$end_page
  }      );
     }   }
     if (!&Apache::lonnet::domain($form{'udom'})) {  
         &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);  # ------------------------------------------------------------------ Rerouting!
         return OK;  
     }  sub reroute {
     my ($key,$firsturl)=split(/&/,$tmpinfo);      my ($r) = @_;
       &Apache::loncommon::content_type($r,'text/html');
     my $keybin=pack("H16",$key);      $r->send_http_header;
       my $msg='<b>'.&mt('Sorry ...').'</b><br />'
     my $cipher;             .&mt('Please [_1]log in again[_2].');
     if ($Crypt::DES::VERSION>=2.03) {      &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
  $cipher=new Crypt::DES $keybin;  }
     }  
     else {  # ---------------------------------------------------------------- Main handler
  $cipher=new DES $keybin;  
     }  sub handler {
     my $upass='';      my $r = shift;
     for (my $i=0;$i<=2;$i++) {      my $londocroot = $r->dir_config('lonDocRoot');
  my $chunk=  # Are we re-routing?
     $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));      if (-e "$londocroot/lon-status/reroute.txt") {
    &reroute($r);
  $chunk.=   return OK;
     $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));      }
   
  $chunk=substr($chunk,1,ord(substr($chunk,0,1)));      &Apache::lonlocal::get_language_handle($r);
  $upass.=$chunk;  
     }  # -------------------------------- Prevent users from attempting to login twice
       my $handle = &Apache::lonnet::check_for_valid_session($r);
 # ---------------------------------------------------------------- Authenticate      if ($handle ne '') {
     my @cancreate;          my $lonidsdir=$r->dir_config('lonIDsDir');
     my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});          if ($handle=~/^publicuser\_/) {
     if (ref($domconfig{'usercreation'}) eq 'HASH') {  # For "public user" - remove it, we apparently really want to login
         if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') {              unlink($r->dir_config('lonIDsDir')."/$handle.id");
             if (ref($domconfig{'usercreation'}{'cancreate'}{'selfcreate'}) eq 'ARRAY') {          } else {
                 @cancreate = @{$domconfig{'usercreation'}{'cancreate'}{'selfcreate'}};  # Indeed, a valid token is found
             } elsif (($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') &&               &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
                      ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne '')) {      &Apache::loncommon::content_type($r,'text/html');
                 @cancreate = ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'});      $r->send_http_header;
             }      my $start_page =
         }          &Apache::loncommon::start_page('Already logged in');
     }      my $end_page =
     my $defaultauth;          &Apache::loncommon::end_page();
     if (grep(/^login$/,@cancreate)) {              my $dest = '/adm/roles';
         $defaultauth = 1;              if ($env{'form.firsturl'} ne '') {
     }                  $dest = $env{'form.firsturl'};
     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,              }
                                               $form{'udom'},$defaultauth);              $r->print(
                      $start_page
 # --------------------------------------------------------------------- Failed?                .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
                 .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
     if ($authhost eq 'no_host') {                      ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
  &failed($r,'Username and/or password could not be authenticated.',                .'</p>'
  \%form);                .$end_page
         return OK;              );
     } elsif ($authhost eq 'no_account_on_host') {              return OK;
         my %domconfig =           }
             &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});      }
         if (grep(/^login$/,@cancreate)) {  
             my $start_page =   # ---------------------------------------------------- No valid token, continue
                 &Apache::loncommon::start_page('Create a user account in LON-CAPA',  
                                                '',{'no_inline_link'   => 1,});  
             my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');      my $buffer;
             my $lonhost = $r->dir_config('lonHostID');      if ($r->header_in('Content-length') > 0) {
             my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};   $r->read($buffer,$r->header_in('Content-length'),0);
             my $contacts =       }
                 &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',      my %form;
                                                         $form{'udom'},$origmail);      foreach my $pair (split(/&/,$buffer)) {
             my ($contact_email) = split(',',$contacts);          my ($name,$value) = split(/=/,$pair);
             my $output = &Apache::createaccount::username_check($form{'uname'},          $value =~ tr/+/ /;
                                                                 $form{'udom'},$domdesc,'',         $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                                                                 $lonhost,$contact_email,$contact_name);         $form{$name}=$value;
             &Apache::loncommon::content_type($r,'text/html');      }
             $r->send_http_header;  
             &Apache::createaccount::print_header($r,$start_page);      if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
             $r->print('<h3>'.&mt('Account creation').'</h3>'.   &failed($r,'Username, password and domain need to be specified.',
                       &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.   \%form);
                       $output.&Apache::loncommon::end_page());          return OK;
             return OK;      }
         } else {  
             &failed($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);  # split user logging in and "su"-user
             return OK;  
         }      ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
     }      $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
       $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
     if (($firsturl eq '') ||       $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
  ($firsturl=~/^\/adm\/(logout|remote)/)) {  
  $firsturl='/adm/roles';      my $role   = $r->dir_config('lonRole');
     }      my $domain = $r->dir_config('lonDefDomain');
 # --------------------------------- Are we attempting to login as somebody else?      my $prodir = $r->dir_config('lonUsersDir');
     if ($form{'suname'}) {      my $contact_name = &mt('LON-CAPA helpdesk');
 # ------------ see if the original user has enough privileges to pull this stunt  
  if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {  # ---------------------------------------- Get the information from login token
 # ---------------------------------------------------- see if the su-user exists  
     unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})      my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
  eq 'no_host') {                                        $form{'serverid'});
  &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));  
 # ------------------------------ see if the su-user is not too highly privileged      if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
  unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {          ($tmpinfo eq 'no_such_host')) {
 # -------------------------------------------------------- actually switch users   &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
     &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.          return OK;
  ' logging in as '.$form{'suname'});      } else {
     $form{'uname'}=$form{'suname'};   my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
  } else {     $form{'serverid'});
     &Apache::lonnet::logthis('Attempted switch user to privileged user');          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 ". $form{'serverid'}." to get login token");
  } else {      return OK;
     &Apache::lonnet::logthis('Non-privileged user attempting switch user');   }
  }      }
     }  
       if (!&Apache::lonnet::domain($form{'udom'})) {
     if ($r->dir_config("lonBalancer") eq 'yes') {          &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
  &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,          return OK;
  \%form);      }
  $r->internal_redirect('/adm/switchserver');  
     } else {      my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
  &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,      if ($rolestr) {
  \%form);          $rolestr = &unescape($rolestr);
     }      }
     return OK;      if ($symbstr) {
 }          $symbstr= &unescape($symbstr);
       }
 1;      if ($iptokenstr) {
 __END__          $iptokenstr = &unescape($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.1.95  
changed lines
  Added in v.1.142

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