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Diff for /loncom/auth/lonauth.pm between versions 1.121 and 1.136

version 1.121, 2012/04/11 11:40:07 version 1.136, 2014/12/05 12:03:20
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;
 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();  use Apache::File();
 use HTML::Entities;  use HTML::Entities;
     
 # ------------------------------------------------------------ Successful login  # ------------------------------------------------------------ Successful login
 sub success {  sub success {
     my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,      my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
  $form) = @_;   $form) = @_;
   
 # ------------------------------------------------------------ Get cookie ready  # ------------------------------------------------------------ Get cookie ready
     my $cookie =      my $cookie =
  &Apache::loncommon::init_user_environment($r, $username, $domain,   &Apache::loncommon::init_user_environment($r, $username, $domain,
   $authhost, $form,    $authhost, $form,
   {'extra_env' => $extra_env,});    {'extra_env' => $extra_env,});
   
     my $public=($username eq 'public' && $domain eq 'public');      my $public=($username eq 'public' && $domain eq 'public');
   
     if ($public or $lowerurl eq 'noredirect') { return $cookie; }      if ($public or $lowerurl eq 'noredirect') { return $cookie; }
   
 # -------------------------------------------------------------------- Log this  # -------------------------------------------------------------------- Log this
   
     &Apache::lonnet::log($domain,$username,$authhost,      &Apache::lonnet::log($domain,$username,$authhost,
                          "Login $ENV{'REMOTE_ADDR'}");                           "Login $ENV{'REMOTE_ADDR'}");
   
 # ------------------------------------------------- Check for critical messages  # ------------------------------------------------- Check for critical messages
   
     my @what=&Apache::lonnet::dump('critical',$domain,$username);      my @what=&Apache::lonnet::dump('critical',$domain,$username);
     if ($what[0]) {      if ($what[0]) {
  if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {   if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
     $lowerurl='/adm/email?critical=display';      $lowerurl='/adm/email?critical=display';
         }          }
     }      }
   
 # ------------------------------------------------------------ Get cookie ready  # ------------------------------------------------------------ Get cookie ready
     $cookie="lonID=$cookie; path=/";      $cookie="lonID=$cookie; path=/";
 # -------------------------------------------------------- Menu script and info  # -------------------------------------------------------- Menu script and info
     my $destination = $lowerurl;      my $destination = $lowerurl;
   
     if (defined($form->{role})) {      if (defined($form->{role})) {
         my $envkey = 'user.role.'.$form->{role};          my $envkey = 'user.role.'.$form->{role};
         my $now=time;          my $now=time;
         my $then=$env{'user.login.time'};          my $then=$env{'user.login.time'};
         my $refresh=$env{'user.refresh.time'};          my $refresh=$env{'user.refresh.time'};
         my $update=$env{'user.update.time'};          my $update=$env{'user.update.time'};
         if (!$update) {          if (!$update) {
             $update = $then;              $update = $then;
         }          }
         if (exists($env{$envkey})) {          if (exists($env{$envkey})) {
             my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);              my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
             &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,              &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
                                          \$trolecode,\$tstatus,\$tstart,\$tend);                                           \$trolecode,\$tstatus,\$tstart,\$tend);
             if ($tstatus eq 'is') {              if ($tstatus eq 'is') {
                 $destination  .= ($destination =~ /\?/) ? '&' : '?';                  $destination  .= ($destination =~ /\?/) ? '&' : '?';
                 my $newrole = &HTML::Entities::encode($form->{role},'"<>&');                  my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
                 $destination .= 'selectrole=1&'.$newrole.'=1';                  $destination .= 'selectrole=1&'.$newrole.'=1';
             }              }
         }          }
     }      }
     if (defined($form->{symb})) {      if (defined($form->{symb})) {
         my $destsymb = $form->{symb};          my $destsymb = $form->{symb};
         $destination  .= ($destination =~ /\?/) ? '&' : '?';          $destination  .= ($destination =~ /\?/) ? '&' : '?';
         if ($destsymb =~ /___/) {          if ($destsymb =~ /___/) {
             # FIXME Need to deal with encrypted symbs and urls as needed.              # FIXME Need to deal with encrypted symbs and urls as needed.
             my ($map,$resid,$desturl)=split(/___/,$destsymb);              my ($map,$resid,$desturl)=split(/___/,$destsymb);
             unless ($desturl=~/^(adm|uploaded|editupload|public)/) {              unless ($desturl=~/^(adm|editupload|public)/) {
                 $desturl = &Apache::lonnet::clutter($desturl);                  $desturl = &Apache::lonnet::clutter($desturl);
             }              }
             $desturl = &HTML::Entities::encode($desturl,'"<>&');              $desturl = &HTML::Entities::encode($desturl,'"<>&');
             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
             $destination .= '&destinationurl='.$desturl.              $destination .= 'destinationurl='.$desturl.
                             '&destsymb='.$destsymb;                              '&destsymb='.$destsymb;
         } else {          } else {
             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
             $destination .= '&destinationurl='.$destsymb;              $destination .= 'destinationurl='.$destsymb;
         }          }
     }      }
     if ($destination =~ m{^/adm/roles}) {      if ($destination =~ m{^/adm/roles}) {
         $destination  .= ($destination =~ /\?/) ? '&' : '?';          $destination  .= ($destination =~ /\?/) ? '&' : '?';
         $destination .= 'source=login';          $destination .= 'source=login';
     }      }
   
     my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');      my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
     my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';      my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
     my $brcrum = [{'href' => '',      my $brcrum = [{'href' => '',
                    'text' => 'Successful Login'},];                     'text' => 'Successful Login'},];
     my $start_page=&Apache::loncommon::start_page('Successful Login',      my $start_page=&Apache::loncommon::start_page('Successful Login',
                                                   $header,                                                    $header,
                                                   {'bread_crumbs' => $brcrum,});                                                    {'bread_crumbs' => $brcrum,});
     my $end_page  =&Apache::loncommon::end_page();      my $end_page  =&Apache::loncommon::end_page();
   
  my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';   my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
 # ------------------------------------------------- Output for successful login  # ------------------------------------------------- Output for successful login
   
     &Apache::loncommon::content_type($r,'text/html');      &Apache::loncommon::content_type($r,'text/html');
     $r->header_out('Set-cookie' => $cookie);      $r->header_out('Set-cookie' => $cookie);
     $r->send_http_header;      $r->send_http_header;
   
     my %lt=&Apache::lonlocal::texthash(      my %lt=&Apache::lonlocal::texthash(
        'wel' => 'Welcome',         'wel' => 'Welcome',
        'pro' => 'Login problems?',         'pro' => 'Login problems?',
        'log' => 'loginproblems.html',         );
        );      my $loginhelp = &loginhelpdisplay($domain);
     my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');       if ($loginhelp) {
     $r->print(<<ENDSUCCESS);          $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
 $start_page      }
 $windowinfo  
 <h1>$lt{'wel'}</h1>      my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
 $welcome<p>      $r->print(<<ENDSUCCESS);
 <a href="/adm/$lt{'log'}">$lt{'pro'}</a></p>  $start_page
 $continuelink  $windowinfo
 $end_page  <h1>$lt{'wel'}</h1>
 ENDSUCCESS  $welcome
 }  $loginhelp
   $continuelink
 # --------------------------------------------------------------- Failed login!  $end_page
   ENDSUCCESS
 sub failed {      return;
     my ($r,$message,$form) = @_;  }
     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef);  
     my $retry = '/adm/login?username='.$form->{'uname'}.  # --------------------------------------------------------------- Failed login!
                 '&domain='.$form->{'udom'};  
     if (exists($form->{role})) {  sub failed {
         $retry .= '&role='.$form->{role};      my ($r,$message,$form) = @_;
     }      (undef,undef,undef,my $clientmathml,my $clientunicode) =
     if (exists($form->{symb})) {          &Apache::loncommon::decode_user_agent();
         $retry .= '&symb='.$form->{symb};      my $args = {};
     }      if ($clientunicode && !$clientmathml) {
     my $end_page   = &Apache::loncommon::end_page();          $args = {'browser.unicode' => 1};
     &Apache::loncommon::content_type($r,'text/html');      }
     $r->send_http_header;  
     $r->print(      my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
        $start_page      my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
       .'<h1>'.&mt('Sorry ...').'</h1>'      my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
       .'<p class="LC_warning">'.&mt($message).'</p>'      if (&Apache::lonnet::domain($udom,'description') eq '') {
       .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>')          undef($udom);
       .'</p>'      }
       .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'      my $retry = '/adm/login';
       .$end_page      if ($uname eq $form->{'uname'}) {
     );          $retry .= '?username='.$uname;
  }      }
       if ($udom) {
 # ------------------------------------------------------------------ Rerouting!          $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;
       }
 sub reroute {      if (exists($form->{role})) {
     my ($r) = @_;          my $role = &Apache::loncommon::cleanup_html($form->{role});
     &Apache::loncommon::content_type($r,'text/html');          if ($role ne '') {
     $r->send_http_header;              $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;
     my $msg='<h1>'.&mt('Sorry ...').'</h1>'          }
            .&mt('Please [_1]log in again[_2].');      }
     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);      if (exists($form->{symb})) {
 }          my $symb = &Apache::loncommon::cleanup_html($form->{symb});
           if ($symb ne '') {
 # ---------------------------------------------------------------- Main handler              $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;
           }
 sub handler {      }
     my $r = shift;      my $end_page = &Apache::loncommon::end_page();
     my $londocroot = $r->dir_config('lonDocRoot');      &Apache::loncommon::content_type($r,'text/html');
     my $form;      $r->send_http_header;
 # Are we re-routing?      my @actions =
     if (-e "$londocroot/lon-status/reroute.txt") {           (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
  &reroute($r);      my $loginhelp = &loginhelpdisplay($udom);
  return OK;      if ($loginhelp) {
     }          push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
       }
     &Apache::lonlocal::get_language_handle($r);      #FIXME: link to helpdesk might be added here
   
 # -------------------------------- Prevent users from attempting to login twice      $r->print(
     my $handle = &Apache::lonnet::check_for_valid_session($r);         $start_page
     if ($handle ne '') {        .'<h2>'.&mt('Sorry ...').'</h2>'
         my $lonidsdir=$r->dir_config('lonIDsDir');        .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
         if ($handle=~/^publicuser\_/) {        .&Apache::lonhtmlcommon::actionbox(\@actions)
 # For "public user" - remove it, we apparently really want to login        .$end_page
             unlink($r->dir_config('lonIDsDir')."/$handle.id");      );
         } else {   }
 # Indeed, a valid token is found  
             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);  # ------------------------------------------------------------------ Rerouting!
     &Apache::loncommon::content_type($r,'text/html');  
     $r->send_http_header;  sub reroute {
     my $start_page =       my ($r) = @_;
         &Apache::loncommon::start_page('Already logged in');      &Apache::loncommon::content_type($r,'text/html');
     my $end_page =       $r->send_http_header;
         &Apache::loncommon::end_page();      my $msg='<b>'.&mt('Sorry ...').'</b><br />'
             my $dest = '/adm/roles';             .&mt('Please [_1]log in again[_2].');
             if ($env{'form.firsturl'} ne '') {      &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
                 $dest = $env{'form.firsturl'};  }
             }  
             $r->print(  # ---------------------------------------------------------------- Main handler
                $start_page  
               .'<p class="LC_warning>"'.&mt('You are already logged in!').'</p>'  sub handler {
               .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'      my $r = shift;
                     ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')      my $londocroot = $r->dir_config('lonDocRoot');
               .'</p>'      my $form;
               .$end_page  # Are we re-routing?
             );      if (-e "$londocroot/lon-status/reroute.txt") {
             return OK;   &reroute($r);
         }   return OK;
     }      }
   
 # ---------------------------------------------------- No valid token, continue      &Apache::lonlocal::get_language_handle($r);
   
   # -------------------------------- Prevent users from attempting to login twice
     my $buffer;      my $handle = &Apache::lonnet::check_for_valid_session($r);
     if ($r->header_in('Content-length') > 0) {      if ($handle ne '') {
  $r->read($buffer,$r->header_in('Content-length'),0);          my $lonidsdir=$r->dir_config('lonIDsDir');
     }          if ($handle=~/^publicuser\_/) {
     my %form;  # For "public user" - remove it, we apparently really want to login
     foreach my $pair (split(/&/,$buffer)) {              unlink($r->dir_config('lonIDsDir')."/$handle.id");
        my ($name,$value) = split(/=/,$pair);          } else {
        $value =~ tr/+/ /;  # Indeed, a valid token is found
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;              &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
        $form{$name}=$value;      &Apache::loncommon::content_type($r,'text/html');
     }       $r->send_http_header;
       my $start_page =
     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {          &Apache::loncommon::start_page('Already logged in');
  &failed($r,'Username, password and domain need to be specified.',      my $end_page =
  \%form);          &Apache::loncommon::end_page();
         return OK;              my $dest = '/adm/roles';
     }              if ($env{'form.firsturl'} ne '') {
                   $dest = $env{'form.firsturl'};
 # split user logging in and "su"-user              }
               $r->print(
     ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});                 $start_page
     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});                .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});                .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
     $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});                      ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
                 .'</p>'
     my $role   = $r->dir_config('lonRole');                .$end_page
     my $domain = $r->dir_config('lonDefDomain');              );
     my $prodir = $r->dir_config('lonUsersDir');              return OK;
     my $contact_name = &mt('LON-CAPA helpdesk');          }
       }
 # ---------------------------------------- Get the information from login token  
   # ---------------------------------------------------- No valid token, continue
     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},  
                                       $form{'serverid'});  
       my $buffer;
     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||       if ($r->header_in('Content-length') > 0) {
         ($tmpinfo eq 'no_such_host')) {   $r->read($buffer,$r->header_in('Content-length'),0);
  &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);      }
         return OK;      my %form;
     } else {      foreach my $pair (split(/&/,$buffer)) {
  my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},         my ($name,$value) = split(/=/,$pair);
    $form{'serverid'});         $value =~ tr/+/ /;
         if ( $reply ne 'ok' ) {         $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
             &failed($r,'Session could not be opened.',\%form);         $form{$name}=$value;
     &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");      }
     return OK;  
  }      if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
     }   &failed($r,'Username, password and domain need to be specified.',
    \%form);
     if (!&Apache::lonnet::domain($form{'udom'})) {          return OK;
         &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);      }
         return OK;  
     }  # split user logging in and "su"-user
   
     my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);      ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
     if ($rolestr) {      $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
         $rolestr = &unescape($rolestr);      $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
     }      $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
     if ($symbstr) {  
         $symbstr= &unescape($symbstr);      my $role   = $r->dir_config('lonRole');
     }      my $domain = $r->dir_config('lonDefDomain');
     if ($rolestr =~ /^role=/) {      my $prodir = $r->dir_config('lonUsersDir');
         (undef,$form{'role'}) = split('=',$rolestr);      my $contact_name = &mt('LON-CAPA helpdesk');
     }  
     if ($symbstr =~ /^symb=/) {   # ---------------------------------------- Get the information from login token
         (undef,$form{'symb'}) = split('=',$symbstr);  
     }      my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
                                         $form{'serverid'});
     my $keybin=pack("H16",$key);  
       my %sessiondata;
     my $cipher;      if ($form{'iptoken'}) {
     if ($Crypt::DES::VERSION>=2.03) {          %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
  $cipher=new Crypt::DES $keybin;          my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
     }      }
     else {  
  $cipher=new DES $keybin;      if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
     }          ($tmpinfo eq 'no_such_host')) {
     my $upass='';   &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
     for (my $i=0;$i<=2;$i++) {          return OK;
  my $chunk=      } else {
     $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));   my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
      $form{'serverid'});
  $chunk.=          if ( $reply ne 'ok' ) {
     $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));              &failed($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");
  $chunk=substr($chunk,1,ord(substr($chunk,0,1)));      return OK;
  $upass.=$chunk;   }
     }      }
   
 # ---------------------------------------------------------------- Authenticate      if (!&Apache::lonnet::domain($form{'udom'})) {
           &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
     my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});          return OK;
     my ($cancreate,$statustocreate) =      }
         &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});  
     my $defaultauth;      my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
     if (ref($cancreate) eq 'ARRAY') {      if ($rolestr) {
         if (grep(/^login$/,@{$cancreate})) {          $rolestr = &unescape($rolestr);
             $defaultauth = 1;      }
         }      if ($symbstr) {
     }          $symbstr= &unescape($symbstr);
     my $clientcancheckhost = 1;      }
     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,      if ($rolestr =~ /^role=/) {
                                               $form{'udom'},$defaultauth,          (undef,$form{'role'}) = split('=',$rolestr);
                                               $clientcancheckhost);      }
           if ($symbstr =~ /^symb=/) {
 # --------------------------------------------------------------------- Failed?          (undef,$form{'symb'}) = split('=',$symbstr);
       }
     if ($authhost eq 'no_host') {  
  &failed($r,'Username and/or password could not be authenticated.',      my $upass = $ENV{HTTPS} ? join("", @form{qw(upass0 upass1 upass2)})
  \%form);          : decrypt($key, @form{qw(upass0 upass1 upass2)});
         return OK;  
     } elsif ($authhost eq 'no_account_on_host') {  # ---------------------------------------------------------------- Authenticate
         if ($defaultauth) {  
             my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');      my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
             unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {      my ($cancreate,$statustocreate) =
                 return OK;          &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
             }      my $defaultauth;
             my $start_page =       if (ref($cancreate) eq 'ARRAY') {
                 &Apache::loncommon::start_page('Create a user account in LON-CAPA');          if (grep(/^login$/,@{$cancreate})) {
             my $lonhost = $r->dir_config('lonHostID');              $defaultauth = 1;
             my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};          }
             my $contacts =       }
                 &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',      my $clientcancheckhost = 1;
                                                         $form{'udom'},$origmail);      my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
             my ($contact_email) = split(',',$contacts);                                                 $form{'udom'},$defaultauth,
             my $output =                                                 $clientcancheckhost);
                 &Apache::createaccount::username_check($form{'uname'},$form{'udom'},     
                                                        $domdesc,'',$lonhost,  # --------------------------------------------------------------------- Failed?
                                                        $contact_email,$contact_name,  
                                                        undef,$statustocreate);      if ($authhost eq 'no_host') {
             &Apache::loncommon::content_type($r,'text/html');   &failed($r,'Username and/or password could not be authenticated.',
             $r->send_http_header;   \%form);
             &Apache::createaccount::print_header($r,$start_page);          return OK;
             $r->print('<h3>'.&mt('Account creation').'</h3>'.      } elsif ($authhost eq 'no_account_on_host') {
                       &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.          if ($defaultauth) {
                       $output.&Apache::loncommon::end_page());              my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
             return OK;              unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
         } else {                  return OK;
             &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;              my $start_page =
         }                  &Apache::loncommon::start_page('Create a user account in LON-CAPA');
     }              my $lonhost = $r->dir_config('lonHostID');
               my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
     if (($firsturl eq '') ||               my $contacts =
  ($firsturl=~/^\/adm\/(logout|remote)/)) {                  &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
  $firsturl='/adm/roles';                                                          $form{'udom'},$origmail);
     }              my ($contact_email) = split(',',$contacts);
 # --------------------------------- Are we attempting to login as somebody else?              my $output =
     if ($form{'suname'}) {                  &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
 # ------------ see if the original user has enough privileges to pull this stunt                                                         $domdesc,'',$lonhost,
  if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {                                                         $contact_email,$contact_name,
 # ---------------------------------------------------- see if the su-user exists                                                         undef,$statustocreate);
     unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})              &Apache::loncommon::content_type($r,'text/html');
  eq 'no_host') {              $r->send_http_header;
  &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));              &Apache::createaccount::print_header($r,$start_page);
 # ------------------------------ see if the su-user is not too highly privileged              $r->print('<h3>'.&mt('Account creation').'</h3>'.
  unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {                        &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
 # -------------------------------------------------------- actually switch users                        $output.&Apache::loncommon::end_page());
     &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.              return OK;
  ' logging in as '.$form{'suname'});          } else {
     $form{'uname'}=$form{'suname'};              &failed($r,'Although your username and password were authenticated, you do not currently have a LON-CAPA account in this domain, and you are not permitted to create one.',\%form);
  } else {              return OK;
     &Apache::lonnet::logthis('Attempted switch user to privileged user');          }
  }      }
     }  
  } else {      if (($firsturl eq '') ||
     &Apache::lonnet::logthis('Non-privileged user attempting switch user');   ($firsturl=~/^\/adm\/(logout|remote)/)) {
  }   $firsturl='/adm/roles';
     }      }
   
     my ($is_balancer,$otherserver) =       my $hosthere;
         &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});      if ($form{'iptoken'}) {
           if (($sessiondata{'domain'} eq $form{'udom'}) &&
     if ($is_balancer) {              ($sessiondata{'username'} eq $form{'uname'})) {
         if (!$otherserver) {               $hosthere = 1;
             ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});          }
         }      }
         if ($otherserver) {  
             &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,  # --------------------------------- Are we attempting to login as somebody else?
                      \%form);      if ($form{'suname'}) {
     $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);  # ------------ see if the original user has enough privileges to pull this stunt
         } else {   if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
             $r->print(&noswitch());  # ---------------------------------------------------- see if the su-user exists
         }      unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
         return OK;   eq 'no_host') {
     } else {   &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
         if (!&check_can_host($r,\%form,$authhost)) {  # ------------------------------ see if the su-user is not too highly privileged
             my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});   unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
             if ($otherserver) {  # -------------------------------------------------------- actually switch users
                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,      &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
                          \%form);   ' logging in as '.$form{'suname'});
                 $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);      $form{'uname'}=$form{'suname'};
             } else {   } else {
                 $r->print(&noswitch());      &Apache::lonnet::logthis('Attempted switch user to privileged user');
             }   }
             return OK;      }
         }   } else {
       &Apache::lonnet::logthis('Non-privileged user attempting switch user');
 # ------------------------------------------------------- Do the load balancing   }
       }
 # ---------------------------------------------------------- Determine own load  
         my $loadlim = $r->dir_config('lonLoadLim');      my ($is_balancer,$otherserver);
         my $loadavg;  
         {      unless ($hosthere) {
             my $loadfile=Apache::File->new('/proc/loadavg');          ($is_balancer,$otherserver) =
             $loadavg=<$loadfile>;              &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
         }      }
         $loadavg =~ s/\s.*//g;  
         my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);      if ($is_balancer) {
         my $userloadpercent=&Apache::lonnet::userload();          if (!$otherserver) {
               ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
 # ---------------------------------------------------------- Are we overloaded?          }
         if ((($userloadpercent>100.0)||($loadpercent>100.0))) {          if ($otherserver) {
             my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});              &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
             if (!$unloaded) {                       \%form);
                 ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});              my $switchto = '/adm/switchserver?otherserver='.$otherserver;
             }              if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
             if ($unloaded) {                  $switchto .= '&origurl='.$firsturl;
                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',              }
                          undef,\%form);              if ($form{'role'}) {
                 $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);                  $switchto .= '&role='.$form{'role'};
                 return OK;              }
             }              if ($form{'symb'}) {
         }                  $switchto .= '&symb='.$form{'symb'};
         &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,              }
                  \%form);              $r->internal_redirect($switchto);
         return OK;          } else {
     }              $r->print(&noswitch());
 }          }
           return OK;
 sub check_can_host {      } else {
     my ($r,$form,$authhost,$domdesc) = @_;          if (!&check_can_host($r,\%form,$authhost)) {
     return unless (ref($form) eq 'HASH');              my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
     my $canhost = 1;              if ($otherserver) {
     my $lonhost = $r->dir_config('lonHostID');                  &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
     my $udom = $form->{'udom'};                           \%form);
     my @intdoms;                  my $switchto = '/adm/switchserver?otherserver='.$otherserver;
     my $internet_names = &Apache::lonnet::get_internet_names($lonhost);                  if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
     if (ref($internet_names) eq 'ARRAY') {                      $switchto .= '&origurl='.$firsturl;
         @intdoms = @{$internet_names};                  }
     }                  if ($form{'role'}) {
     my $uprimary_id = &Apache::lonnet::domain($udom,'primary');                      $switchto .= '&role='.$form{'role'};
     my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);                  }
     unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {                  if ($form{'symb'}) {
         my $machine_dom = &Apache::lonnet::host_domain($lonhost);                      $switchto .= '&symb='.$form{'symb'};
         my $hostname = &Apache::lonnet::hostname($lonhost);                  }
         my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);                  $r->internal_redirect($switchto);
         my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);              } else {
         my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);                  $r->print(&noswitch());
         my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);              }
         my $loncaparev;              return OK;
         if ($authhost eq 'no_account_on_host') {          }
             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);  
         } else {  # ------------------------------------------------------- Do the load balancing
             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);  
         }  # ---------------------------------------------------------- Determine own load
         $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,          my $loadlim = $r->dir_config('lonLoadLim');
                                                      $udomdefaults{'remotesessions'},          my $loadavg;
                                                      $defdomdefaults{'hostedsessions'});          {
     }              my $loadfile=Apache::File->new('/proc/loadavg');
     unless ($canhost) {              $loadavg=<$loadfile>;
         if ($authhost eq 'no_account_on_host') {          }
             my $checkloginvia = 1;          $loadavg =~ s/\s.*//g;
             my ($login_host,$hostname) =           my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
                 &Apache::lonnet::choose_server($udom,$checkloginvia);          my $userloadpercent=&Apache::lonnet::userload();
             &Apache::loncommon::content_type($r,'text/html');  
             $r->send_http_header;  # ---------------------------------------------------------- Are we overloaded?
             if ($login_host ne '') {          if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
                 my $protocol = $Apache::lonnet::protocol{$login_host};              my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
                 $protocol = 'http' if ($protocol ne 'https');              if (!$unloaded) {
                 my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';                  ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
                 $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').              }
                           '<h3>'.&mt('Account creation').'</h3>'.              if ($unloaded) {
                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.                  &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
                           '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.                           undef,\%form);
                           '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').                  $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
                           &Apache::loncommon::end_page());                  return OK;
             } else {              }
                 $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').          }
                           '<h3>'.&mt('Account creation unavailable').'</h3>'.          &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.                   \%form);
                           '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.          return OK;
                           &Apache::loncommon::end_page());      }
             }  }
         } else {  
             &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,  sub decrypt {
                      $form);      my ($key, @chunks) = @_;
             my ($otherserver) = &Apache::lonnet::choose_server($udom);  
             $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);      my $keybin = pack("H16",$key);
         }  
     }      my $cipher;
     return $canhost;      if ($Crypt::DES::VERSION >= 2.03) {
 }          $cipher = new Crypt::DES $keybin;
       } else {
 sub noswitch {          $cipher = new DES $keybin;
     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 />'.      my $upass='';
                  '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.      for (my $i=0;$i<=2;$i++) {
                  &Apache::loncommon::end_page();          my $chunk =
     return $result;              $cipher->decrypt(
 }                  unpack("a8",pack("H16",substr($chunks[$i],0,16))));
   
 1;          $chunk .=
 __END__              $cipher->decrypt(
                   unpack("a8",pack("H16",substr($chunks[$i],16,16))));
   
           $chunk = substr($chunk,1,ord(substr($chunk,0,1)));
           $upass .= $chunk;
       }
       return $upass;
   }
   
   sub check_can_host {
       my ($r,$form,$authhost,$domdesc) = @_;
       return unless (ref($form) eq 'HASH');
       my $canhost = 1;
       my $lonhost = $r->dir_config('lonHostID');
       my $udom = $form->{'udom'};
       my @intdoms;
       my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
       if (ref($internet_names) eq 'ARRAY') {
           @intdoms = @{$internet_names};
       }
       my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
       my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
       unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
           my $machine_dom = &Apache::lonnet::host_domain($lonhost);
           my $hostname = &Apache::lonnet::hostname($lonhost);
           my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
           my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
           my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
           my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
           my $loncaparev;
           if ($authhost eq 'no_account_on_host') {
               $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
           } else {
               $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
           }
           $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
                                                        $udomdefaults{'remotesessions'},
                                                        $defdomdefaults{'hostedsessions'});
       }
       unless ($canhost) {
           if ($authhost eq 'no_account_on_host') {
               my $checkloginvia = 1;
               my ($login_host,$hostname) =
                   &Apache::lonnet::choose_server($udom,$checkloginvia);
               &Apache::loncommon::content_type($r,'text/html');
               $r->send_http_header;
               if ($login_host ne '') {
                   my $protocol = $Apache::lonnet::protocol{$login_host};
                   $protocol = 'http' if ($protocol ne 'https');
                   my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
                   $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
                             '<h3>'.&mt('Account creation').'</h3>'.
                             &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                             '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
                             '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
                             &Apache::loncommon::end_page());
               } else {
                   $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                             '<h3>'.&mt('Account creation unavailable').'</h3>'.
                             &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                             '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
                             &Apache::loncommon::end_page());
               }
           } else {
               &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
                        $form);
               my ($otherserver) = &Apache::lonnet::choose_server($udom);
               $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
           }
       }
       return $canhost;
   }
   
   sub noswitch {
       my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                    '<h3>'.&mt('Session unavailable').'</h3>'.
                    &mt('This LON-CAPA server is unable to host your session.').'<br />'.
                    '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
                    &Apache::loncommon::end_page();
       return $result;
   }
   
   sub loginhelpdisplay {
       my ($authdomain) = @_;
       my $login_help = 1;
       my $lang = &Apache::lonlocal::current_language();
       if ($login_help) {
           my $dom = $authdomain;
           if ($dom eq '') {
               $dom = &Apache::lonnet::default_login_domain();
           }
           my %domconfhash = &Apache::loncommon::get_domainconf($dom);
           my $loginhelp_url;
           if ($lang) {
               $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
               if ($loginhelp_url ne '') {
                   return $loginhelp_url;
               }
           }
           $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
           if ($loginhelp_url ne '') {
               return $loginhelp_url;
           } else {
               return '/adm/loginproblems.html';
           }
       }
       return;
   }
   
   1;
   __END__
   
   
Removed from v.1.121  
changed lines
  Added in v.1.136

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