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Diff for /loncom/auth/lonauth.pm between versions 1.87 and 1.143

version 1.87, 2006/11/23 01:49:41 version 1.143, 2017/02/25 20:00:36
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 CGI::Cookie();  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 Fcntl qw(:flock);  use Fcntl qw(:flock);
 use Apache::lonlocal;  use Apache::lonlocal;
    use Apache::File();
 # ------------------------------------------------------------ Successful login  use HTML::Entities;
 sub success {  use Digest::MD5;
     my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,   
  $form) = @_;  # ------------------------------------------------------------ Successful login
   sub success {
 # ------------------------------------------------------------ Get cookie ready      my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
     my $cookie =   $form) = @_;
  &Apache::loncommon::init_user_environment($r, $username, $domain,  
   $authhost, $form,  # ------------------------------------------------------------ Get cookie ready
   {'extra_env' => $extra_env,});      my $cookie =
    &Apache::loncommon::init_user_environment($r, $username, $domain,
     my $public=($username eq 'public' && $domain eq 'public');    $authhost, $form,
     {'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,  
                          "Login $ENV{'REMOTE_ADDR'}");  # -------------------------------------------------------------------- Log this
   
 # ------------------------------------------------- Check for critical messages      &Apache::lonnet::log($domain,$username,$authhost,
                            "Login $ENV{'REMOTE_ADDR'}");
     my @what=&Apache::lonnet::dump('critical',$domain,$username);  
     if ($what[0]) {  # ------------------------------------------------- Check for critical messages
  if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {  
     $lowerurl='/adm/email?critical=display';      my @what=&Apache::lonnet::dump('critical',$domain,$username);
         }      if ($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  
     my $windowinfo=&Apache::lonmenu::open($env{'browser.os'});  # ----------------------------------------------------------- Get cookies ready
     my $startupremote=&Apache::lonmenu::startupremote($lowerurl);      my ($securecookie,$defaultcookie);
     my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);      if ($ENV{'SERVER_PORT'} == 443) {
     my $setflags=&Apache::lonmenu::setflags();          $securecookie="lonID=$cookie; path=/; HttpOnly; secure";
     my $maincall=&Apache::lonmenu::maincall();          my $lonidsdir=$r->dir_config('lonIDsDir');
     my $start_page=&Apache::loncommon::start_page('Successful Login',          if (($lonidsdir) && (-e "$lonidsdir/$cookie.id")) {
   $startupremote,              my $linkname=substr(Digest::MD5::md5_hex(Digest::MD5::md5_hex(time(). {}. rand(). $$)), 0, 32).'_linked';
   {'no_inline_link' => 1,});              if (-e "$lonidsdir/$linkname.id") {
     my $end_page  =&Apache::loncommon::end_page();                  unlink("$lonidsdir/$linkname.id");
               }
     my $continuelink;              my $made_symlink = eval { symlink("$lonidsdir/$cookie.id",
     if (($env{'browser.interface'} eq 'textual') ||                                                "$lonidsdir/$linkname.id"); 1 };
         ($env{'environment.remote'} eq 'off')) {              if ($made_symlink) {
  $continuelink="<a href=\"$lowerurl\">".&mt('Continue')."</a>";                  $defaultcookie = "lonLinkID=$linkname; path=/; HttpOnly;";
     }                  &Apache::lonnet::appenv({'user.linkedenv' => "$lonidsdir/$linkname.id"});
 # ------------------------------------------------- Output for successful login              }
           }
     &Apache::loncommon::content_type($r,'text/html');      } else {
     $r->header_out('Set-cookie' => $cookie);          $defaultcookie = "lonID=$cookie; path=/; HttpOnly;";
     $r->send_http_header;      }
   # -------------------------------------------------------- Menu script and info
     my %lt=&Apache::lonlocal::texthash(      my $destination = $lowerurl;
        'wel' => 'Welcome',  
        'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up',      if (defined($form->{role})) {
        'pro' => 'Problems',          my $envkey = 'user.role.'.$form->{role};
        'log' => 'loginproblems.html',          my $now=time;
        );          my $then=$env{'user.login.time'};
     $r->print(<<ENDSUCCESS);          my $refresh=$env{'user.refresh.time'};
 $start_page          my $update=$env{'user.update.time'};
 $setflags          if (!$update) {
 $windowinfo              $update = $then;
 <h1>$lt{'wel'}</h1>          }
 $lt{'mes'}.<p>          if (exists($env{$envkey})) {
 <a href="/adm/$lt{'log'}">$lt{'pro'}?</a></p>              my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
 $remoteinfo              &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
 $maincall                                           \$trolecode,\$tstatus,\$tstart,\$tend);
 $continuelink              if ($tstatus eq 'is') {
 $end_page                  $destination  .= ($destination =~ /\?/) ? '&' : '?';
 ENDSUCCESS                  my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
 }                  $destination .= 'selectrole=1&'.$newrole.'=1';
               }
 # --------------------------------------------------------------- Failed login!          }
       }
 sub failed {      if (defined($form->{symb})) {
     my ($r,$message,$form) = @_;          my $destsymb = $form->{symb};
     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,          $destination  .= ($destination =~ /\?/) ? '&' : '?';
     {'no_inline_link' => 1,});          if ($destsymb =~ /___/) {
     my $end_page   = &Apache::loncommon::end_page();              # FIXME Need to deal with encrypted symbs and urls as needed.
               my ($map,$resid,$desturl)=split(/___/,$destsymb);
     my %lt=('sorry'  => &mt('Sorry ...'),              $desturl = &Apache::lonnet::clutter($desturl);
     'please' =>               $desturl = &HTML::Entities::encode($desturl,'"<>&');
     &mt('Please [_1]log in again[_2].',              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
  "<a href=\"/adm/login?username=$form->{'uname'}&domain=$form->{'udom'}\">",              $destination .= 'destinationurl='.$desturl.
  '</a>'),                              '&destsymb='.$destsymb;
     'problemspage' => &mt('loginproblems.html'),          } else {
     'problems'     => 'Problems',              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
     );              $destination .= 'destinationurl='.$destsymb;
     &Apache::loncommon::content_type($r,'text/html');          }
     $r->send_http_header;      }
       if ($destination =~ m{^/adm/roles}) {
     $r->print(<<ENDFAILED);          $destination  .= ($destination =~ /\?/) ? '&' : '?';
 $start_page          $destination .= 'source=login';
 <h1>$lt{'sorry'}</h1>      }
 <p><b>$message</b></p>  
 <p>$lt{'please'}</p>      my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
 <p>      my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
 <a href="/adm/$lt{'problemspage'}">$lt{'problems'}</a></p>      my $brcrum = [{'href' => '',
 $end_page                     'text' => 'Successful Login'},];
 ENDFAILED      my $args = {'bread_crumbs' => $brcrum,};
 }      unless ((defined($form->{role})) || (defined($form->{symb}))) {
           my $update=$env{'user.update.time'};
 # ------------------------------------------------------------------ Rerouting!          if (!$update) {
               $update = $env{'user.login.time'};
 sub reroute {          }
     my ($r) = @_;          my %roles_in_env;
     &Apache::loncommon::content_type($r,'text/html');          my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
     $r->send_http_header;          if ($showcount == 1) {
     my $msg='<h1>Sorry ...</h1>              foreach my $rolecode (keys(%roles_in_env)) {
              Please <a href="/">log in again</a>.';                  my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);                  if ($cid) {
 }                      my %coursedescription =
                           &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
 # ---------------------------------------------------------------- Main handler                      if ($coursedescription{'type'} eq 'Placement') {
                           $args->{'crstype'} = 'Placement';
 sub handler {                      }
     my $r = shift;                      last;
     my $form;                  }
 # Are we re-routing?              }
     if (-e '/home/httpd/html/lon-status/reroute.txt') {          }
  &reroute($r);      }
  return OK;      my $start_page=&Apache::loncommon::start_page('Successful Login',
     }                                                    $header,$args);
       my $end_page  =&Apache::loncommon::end_page();
     &Apache::lonlocal::get_language_handle($r);  
    my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
 # -------------------------------- Prevent users from attempting to login twice  # ------------------------------------------------- Output for successful login
     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));  
     my $lonid=$cookies{'lonID'};      &Apache::loncommon::content_type($r,'text/html');
     my $cookie;      if ($securecookie) {
     if ($lonid) {          $r->headers_out->add('Set-cookie' => $securecookie);
  my $handle=&LONCAPA::clean_handle($lonid->value);      }
         my $lonidsdir=$r->dir_config('lonIDsDir');      if ($defaultcookie) {
         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {          $r->headers_out->add('Set-cookie' => $defaultcookie);
 # Indeed, a valid token is found      }
     &Apache::loncommon::content_type($r,'text/html');      $r->send_http_header;
     $r->send_http_header;  
     my $start_page =       my %lt=&Apache::lonlocal::texthash(
  &Apache::loncommon::start_page('Already logged in');         'wel' => 'Welcome',
     my $end_page =          'pro' => 'Login problems?',
  &Apache::loncommon::end_page();         );
     $r->print(<<ENDFAILED);      my $loginhelp = &loginhelpdisplay($domain);
 $start_page      if ($loginhelp) {
 <h1>You are already logged in</h1>          $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
 <p>Please either <a href="/adm/roles">continue the current session</a> or      }
 <a href="/adm/logout">logout</a>.</p>  
 <p>      my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
 <a href="/adm/loginproblems.html">Problems?</a></p>      $r->print(<<ENDSUCCESS);
 $end_page  $start_page
 ENDFAILED  $windowinfo
            return OK;  <h1>$lt{'wel'}</h1>
  }  $welcome
     }  $loginhelp
   $continuelink
 # ---------------------------------------------------- No valid token, continue  $end_page
   ENDSUCCESS
       return;
     my $buffer;  }
     if ($r->header_in('Content-length') > 0) {  
  $r->read($buffer,$r->header_in('Content-length'),0);  # --------------------------------------------------------------- Failed login!
     }  
     my %form;  sub failed {
     foreach my $pair (split(/&/,$buffer)) {      my ($r,$message,$form) = @_;
        my ($name,$value) = split(/=/,$pair);      (undef,undef,undef,my $clientmathml,my $clientunicode) =
        $value =~ tr/+/ /;          &Apache::loncommon::decode_user_agent();
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;      my $args = {};
        $form{$name}=$value;      if ($clientunicode && !$clientmathml) {
     }           $args = {'browser.unicode' => 1};
       }
     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {  
  &failed($r,'Username, password and domain need to be specified.',      my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
  \%form);      my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
         return OK;      my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
     }      if (&Apache::lonnet::domain($udom,'description') eq '') {
           undef($udom);
 # split user logging in and "su"-user      }
       my $retry = '/adm/login';
     ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});      if ($uname eq $form->{'uname'}) {
     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});          $retry .= '?username='.$uname;
     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});      }
     $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});      if ($udom) {
           $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;
     my $role   = $r->dir_config('lonRole');      }
     my $domain = $r->dir_config('lonDefDomain');      if (exists($form->{role})) {
     my $prodir = $r->dir_config('lonUsersDir');          my $role = &Apache::loncommon::cleanup_html($form->{role});
           if ($role ne '') {
 # ---------------------------------------- Get the information from login token              $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;
           }
     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},      }
                                       $form{'serverid'});      if (exists($form->{symb})) {
           my $symb = &Apache::loncommon::cleanup_html($form->{symb});
     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {          if ($symb ne '') {
  &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);              $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;
         return OK;          }
     } else {      }
  my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},      my $end_page = &Apache::loncommon::end_page();
    $form{'serverid'});      &Apache::loncommon::content_type($r,'text/html');
         if ( $reply ne 'ok' ) {      $r->send_http_header;
             &failed($r,'Session could not be opened.',\%form);      my @actions =
     &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");           (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
     return OK;      my $loginhelp = &loginhelpdisplay($udom);
  }      if ($loginhelp) {
     }          push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
     my ($key,$firsturl)=split(/&/,$tmpinfo);      }
       #FIXME: link to helpdesk might be added here
     my $keybin=pack("H16",$key);  
       $r->print(
     my $cipher;         $start_page
     if ($Crypt::DES::VERSION>=2.03) {        .'<h2>'.&mt('Sorry ...').'</h2>'
  $cipher=new Crypt::DES $keybin;        .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
     }        .&Apache::lonhtmlcommon::actionbox(\@actions)
     else {        .$end_page
  $cipher=new DES $keybin;      );
     }   }
     my $upass='';  
     for (my $i=0;$i<=2;$i++) {  # ------------------------------------------------------------------ Rerouting!
  my $chunk=  
     $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));  sub reroute {
       my ($r) = @_;
  $chunk.=      &Apache::loncommon::content_type($r,'text/html');
     $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));      $r->send_http_header;
       my $msg='<b>'.&mt('Sorry ...').'</b><br />'
  $chunk=substr($chunk,1,ord(substr($chunk,0,1)));             .&mt('Please [_1]log in again[_2].');
  $upass.=$chunk;      &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
     }  }
   
 # ---------------------------------------------------------------- Authenticate  # ---------------------------------------------------------------- Main handler
     my $authhost=Apache::lonnet::authenticate($form{'uname'},  
                                               $upass,  sub handler {
                                               $form{'udom'});      my $r = shift;
           my $londocroot = $r->dir_config('lonDocRoot');
 # --------------------------------------------------------------------- Failed?  # Are we re-routing?
       if (-e "$londocroot/lon-status/reroute.txt") {
     if ($authhost eq 'no_host') {   &reroute($r);
  &failed($r,'Username and/or password could not be authenticated.',   return OK;
  \%form);      }
         return OK;  
     }      &Apache::lonlocal::get_language_handle($r);
   
     if (($firsturl eq '') ||   # -------------------------------- Prevent users from attempting to login twice
  ($firsturl=~/^\/adm\/(logout|remote)/)) {      my $handle = &Apache::lonnet::check_for_valid_session($r);
  $firsturl='/adm/roles';      if ($handle ne '') {
     }          my $lonidsdir=$r->dir_config('lonIDsDir');
 # --------------------------------- Are we attempting to login as somebody else?          if ($handle=~/^publicuser\_/) {
     if ($form{'suname'}) {  # For "public user" - remove it, we apparently really want to login
 # ------------ see if the original user has enough privileges to pull this stunt              unlink($r->dir_config('lonIDsDir')."/$handle.id");
  if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {          } else {
 # ---------------------------------------------------- see if the su-user exists  # Indeed, a valid token is found
     unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})              &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
  eq 'no_host') {      &Apache::loncommon::content_type($r,'text/html');
  &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));      $r->send_http_header;
 # ------------------------------ see if the su-user is not too highly privileged      my $start_page =
  unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {          &Apache::loncommon::start_page('Already logged in');
 # -------------------------------------------------------- actually switch users      my $end_page =
     &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.          &Apache::loncommon::end_page();
  ' logging in as '.$form{'suname'});              my $dest = '/adm/roles';
     $form{'uname'}=$form{'suname'};              if ($env{'form.firsturl'} ne '') {
  } else {                  $dest = $env{'form.firsturl'};
     &Apache::lonnet::logthis('Attempted switch user to privileged user');              }
  }              $r->print(
     }                 $start_page
  } else {                .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
     &Apache::lonnet::logthis('Non-privileged user attempting switch user');                .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
  }                      ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
     }                .'</p>'
                 .$end_page
     if ($r->dir_config("lonBalancer") eq 'yes') {              );
  &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,              return OK;
  \%form);          }
  $r->internal_redirect('/adm/switchserver');      }
     } else {  
  &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,  # ---------------------------------------------------- No valid token, continue
  \%form);  
     }  
     return OK;      my $buffer;
 }      if ($r->header_in('Content-length') > 0) {
    $r->read($buffer,$r->header_in('Content-length'),0);
 1;      }
 __END__      my %form;
       foreach my $pair (split(/&/,$buffer)) {
          my ($name,$value) = split(/=/,$pair);
          $value =~ tr/+/ /;
          $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
          $form{$name}=$value;
       }
   
       if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
    &failed($r,'Username, password and domain need to be specified.',
    \%form);
           return OK;
       }
   
   # split user logging in and "su"-user
   
       ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
       $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
       $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
       $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
   
       my $role   = $r->dir_config('lonRole');
       my $domain = $r->dir_config('lonDefDomain');
       my $prodir = $r->dir_config('lonUsersDir');
       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.1.87  
changed lines
  Added in v.1.143

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