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Diff for /loncom/auth/lonauth.pm between versions 1.67 and 1.155

version 1.67, 2005/06/07 02:14:28 version 1.155, 2018/11/10 10:53:01
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 Apache::Constants qw(:common);  use LONCAPA qw(:DEFAULT :match);
 use Apache::File;  use Apache::Constants qw(:common);
 use CGI qw(:standard);  use CGI qw(:standard);
 use CGI::Cookie();  use Apache::loncommon();
 use DynaLoader; # for Crypt::DES version  use Apache::lonnet;
 use Crypt::DES;  use Apache::lonmenu();
 use Apache::loncommon();  use Apache::createaccount;
 use Apache::lonnet;  use Apache::ltiauth;
 use Apache::lonmenu();  use Fcntl qw(:flock);
 use Fcntl qw(:flock);  use Apache::lonlocal;
 use Apache::lonlocal;  use Apache::File();
   use HTML::Entities;
 my %FORM;  use Digest::MD5;
    
 # ------------------------------------------------------------ Successful login  # ------------------------------------------------------------ Successful login
   sub success {
 sub success {      my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
     my ($r, $username, $domain, $authhost,$lowerurl) = @_;   $form,$skipcritical) = @_;
     my $lonids=$r->dir_config('lonIDsDir');  
   # ------------------------------------------------------------ Get cookie ready
 # See if old ID present, if so, remove      my $cookie =
    &Apache::loncommon::init_user_environment($r, $username, $domain,
     my $filename;    $authhost, $form,
     opendir(DIR,$lonids);    {'extra_env' => $extra_env,});
     while ($filename=readdir(DIR)) {  
        if ($filename=~/^$username\_\d+\_$domain\_$authhost\.id$/) {      my $public=($username eq 'public' && $domain eq 'public');
   unlink($lonids.'/'.$filename);  
        }      if ($public or $lowerurl eq 'noredirect') { return $cookie; }
     }  
     closedir(DIR);  # -------------------------------------------------------------------- Log this
   
 # Give them a new cookie      &Apache::lonnet::log($domain,$username,$authhost,
                            "Login $ENV{'REMOTE_ADDR'}");
     my $cookie;  
     my $now=time;  # ------------------------------------------------- Check for critical messages
     $cookie="$username\_$now\_$domain\_$authhost";  
       unless ($skipcritical) {
 # Initialize roles          my @what=&Apache::lonnet::dump('critical',$domain,$username);
           if ($what[0]) {
     my $userroles=Apache::lonnet::rolesinit($domain,$username,$authhost);      if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
           $lowerurl='/adm/email?critical=display';
 # ------------------------------------ Check browser type and MathML capability              }
           }
     my ($httpbrowser,$clientbrowser,$clientversion,$clientmathml,      }
         $clientunicode,$clientos) = &Apache::loncommon::decode_user_agent($r);  
   # ----------------------------------------------------------- Get cookies ready
 # -------------------------------------- Any accessibility options to remember?      my ($securecookie,$defaultcookie);
     if (($FORM{'interface'}) && ($FORM{'remember'} eq 'true')) {      my $ssl = $r->subprocess_env('https');
  foreach ('imagesuppress','appletsuppress',      if ($ssl) {
  'embedsuppress','fontenhance','blackwhite') {          $securecookie="lonSID=$cookie; path=/; HttpOnly; secure";
     if ($FORM{$_} eq 'true') {          my $lonidsdir=$r->dir_config('lonIDsDir');
  &Apache::lonnet::put('environment',{$_ => 'on'},          if (($lonidsdir) && (-e "$lonidsdir/$cookie.id")) {
      $domain,$username);              my $linkname=substr(Digest::MD5::md5_hex(Digest::MD5::md5_hex(time(). {}. rand(). $$)), 0, 32).'_linked';
     } else {              if (-e "$lonidsdir/$linkname.id") {
  &Apache::lonnet::del('environment',[$_],$domain,$username);                  unlink("$lonidsdir/$linkname.id");
     }              }
  }              my $made_symlink = eval { symlink("$lonidsdir/$cookie.id",
     }                                                "$lonidsdir/$linkname.id"); 1 };
 # ------------------------------------------------------------- Get environment              if ($made_symlink) {
                   $defaultcookie = "lonLinkID=$linkname; path=/; HttpOnly;";
     my $userenv;                  &Apache::lonnet::appenv({'user.linkedenv' => $linkname});
     my %userenv=Apache::lonnet::dump('environment',$domain,$username);              }
     my ($tmp) = keys(%userenv);          }
     if ($tmp !~ /^(con_lost|error|no_such_host)/i) {      } else {
  foreach my $key (keys(%userenv)) {          $defaultcookie = "lonID=$cookie; path=/; HttpOnly;";
     $userenv.="environment.$key=$userenv{$key}\n";      }
  }  # -------------------------------------------------------- Menu script and info
     }      my $destination = $lowerurl;
     if (($userenv{'interface'}) && (!$FORM{'interface'})) {      if ($env{'request.lti.login'}) {
  $FORM{'interface'}=$userenv{'interface'};          if (($env{'request.lti.reqcrs'}) && ($env{'request.lti.reqrole'} eq 'cc')) {
     }              &Apache::loncommon::content_type($r,'text/html');
     $env{'environment.remote'}=$userenv{'remote'};              if ($securecookie) {
     if ($userenv{'texengine'} eq 'ttm') { $clientmathml=1; }                  $r->headers_out->add('Set-cookie' => $securecookie);
               }
 # --------------- Do not trust query string to be put directly into environment              if ($defaultcookie) {
     foreach ('imagesuppress','appletsuppress',                  $r->headers_out->add('Set-cookie' => $defaultcookie);
      'embedsuppress','fontenhance','blackwhite',              }
      'interface','localpath','localres') {              $r->send_http_header;
  $FORM{$_}=~s/[\n\r\=]//gs;              if (ref($form) eq 'HASH') {
     }                  $form->{'lti.reqcrs'} = $env{'request.lti.reqcrs'};
 # --------------------------------------------------------- Write first profile                  $form->{'lti.reqrole'} = $env{'request.lti.reqrole'};
                   $form->{'lti.sourcecrs'} = $env{'request.lti.sourcecrs'};
     {              }
  my $idf=Apache::File->new(">$lonids/$cookie.id");              &Apache::ltiauth::lti_reqcrs($r,$domain,$form,$username,$domain);
  unless (flock($idf,LOCK_EX)) {              return;
     &Apache::lonnet::logthis("<font color=blue>WARNING: ".          }
    'Could not obtain exclusive lock in lonauth: '.$!);          if ($env{'request.lti.selfenrollrole'}) {
     $idf->close();              if (&Apache::ltiauth::lti_enroll($username,$domain,
     return 'error: '.$!;                                               $env{'request.lti.selfenrollrole'}) eq 'ok') {
  }                  $form->{'role'} = $env{'request.lti.selfenrollrole'};
  if ($userenv ne '') { print $idf "$userenv\n"; }                  &Apache::lonnet::delenv('request.lti.selfenrollrole');
  print $idf "user.name=$username\n";              } else {
  print $idf "user.domain=$domain\n";                  &Apache::ltiauth::invalid_request($r,24);
  print $idf "user.home=$authhost\n";              }
  print $idf "browser.type=$clientbrowser\n";          }
  print $idf "browser.version=$clientversion\n";      }
  print $idf "browser.mathml=$clientmathml\n";      if (defined($form->{role})) {
  print $idf "browser.unicode=$clientunicode\n";          my $envkey = 'user.role.'.$form->{role};
  print $idf "browser.os=$clientos\n";          my $now=time;
         if ($FORM{'localpath'}) {          my $then=$env{'user.login.time'};
            print $idf "browser.localpath=$FORM{'localpath'}\n";          my $refresh=$env{'user.refresh.time'};
            print $idf "browser.localres=$FORM{'localres'}\n";          my $update=$env{'user.update.time'};
         }          if (!$update) {
  print $idf "request.course.fn=\n";              $update = $then;
  print $idf "request.course.uri=\n";          }
  print $idf "request.course.sec=\n";          if (exists($env{$envkey})) {
  print $idf "request.role=cm\n";              my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
         print $idf "request.role.adv=$env{'user.adv'}\n";              &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
  print $idf "request.host=$ENV{'REMOTE_ADDR'}\n";                                           \$trolecode,\$tstatus,\$tstart,\$tend);
  if ($FORM{'interface'}) {              if ($tstatus eq 'is') {
     $FORM{'interface'}=~s/\W//gs;                  $destination  .= ($destination =~ /\?/) ? '&' : '?';
     print $idf "browser.interface=$FORM{'interface'}\n";                  my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
     $env{'browser.interface'}=$FORM{'interface'};                  $destination .= 'selectrole=1&'.$newrole.'=1';
     foreach ('imagesuppress','appletsuppress',              }
      'embedsuppress','fontenhance','blackwhite') {          }
  if (($FORM{$_} eq 'true') ||      }
     ($userenv{$_} eq 'on')) {      if (defined($form->{symb})) {
     print $idf "browser.$_=on\n";          my $destsymb = $form->{symb};
  }          $destination  .= ($destination =~ /\?/) ? '&' : '?';
     }          if ($destsymb =~ /___/) {
  }              # FIXME Need to deal with encrypted symbs and urls as needed.
  if ($userroles ne '') { print $idf "$userroles"; }              my ($map,$resid,$desturl)=split(/___/,$destsymb);
  $idf->close();              $desturl = &Apache::lonnet::clutter($desturl);
     }              $desturl = &HTML::Entities::encode($desturl,'"<>&');
     $env{'request.role'}='cm';              $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
     $env{'request.role.adv'}=$env{'user.adv'};              $destination .= 'destinationurl='.$desturl.
     $env{'browser.type'}=$clientbrowser;                              '&destsymb='.$destsymb;
 # -------------------------------------------------------------------- Log this          } else {
               $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
     &Apache::lonnet::log($domain,$username,$authhost,              $destination .= 'destinationurl='.$destsymb;
                          "Login $ENV{'REMOTE_ADDR'}");          }
       }
 # ------------------------------------------------- Check for critical messages      if ($destination =~ m{^/adm/roles}) {
           $destination  .= ($destination =~ /\?/) ? '&' : '?';
     my @what=&Apache::lonnet::dump('critical',$domain,$username);          $destination .= 'source=login';
     if ($what[0]) {      }
  if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {  
     $lowerurl='/adm/email?critical=display';      my $windowname = 'loncapaclient';
         }      if ($env{'request.lti.login'}) {
     }          $windowname .= 'lti';
       }
 # ------------------------------------------------------------ Get cookie ready      my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="'.$windowname.'";');
       my $brcrum = [{'href' => '',
     $cookie="lonID=$cookie; path=/";                     'text' => 'Successful Login'},];
 # -------------------------------------------------------- Menu script and info      my $args = {'bread_crumbs' => $brcrum,};
     my $windowinfo=&Apache::lonmenu::open($clientos);      unless ((defined($form->{role})) || (defined($form->{symb}))) {
     my $startupremote=&Apache::lonmenu::startupremote($lowerurl);          my $update=$env{'user.update.time'};
     my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);          if (!$update) {
     my $setflags=&Apache::lonmenu::setflags();              $update = $env{'user.login.time'};
     my $maincall=&Apache::lonmenu::maincall();          }
     my $bodytag=&Apache::loncommon::bodytag('Successful Login');          my %roles_in_env;
     my $add=&addcontent();          my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
     my $continuelink;          if ($showcount == 1) {
     if (($env{'browser.interface'} eq 'textual') ||              foreach my $rolecode (keys(%roles_in_env)) {
         ($env{'environment.remote'} eq 'off')) {                  my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
  $continuelink="<a href=\"$lowerurl\">".&mt('Continue')."</a>";                  if ($cid) {
     }                      my %coursedescription =
 # ------------------------------------------------- Output for successful login                          &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
                       if ($coursedescription{'type'} eq 'Placement') {
     $r->send_cgi_header(<<ENDHEADER);                          $args->{'crstype'} = 'Placement';
 Content-type: text/html$add                      }
 Set-cookie: $cookie                      last;
                   }
 ENDHEADER              }
     my %lt=&Apache::lonlocal::texthash(          }
        'wel' => 'Welcome',      }
        'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up',  
        'pro' => 'Problems',  # ------------------------------------------------- Output for successful login
        'log' => 'loginproblems.html',  
        );      &Apache::loncommon::content_type($r,'text/html');
     $r->print(<<ENDSUCCESS);      if ($securecookie) {
 <html>          $r->headers_out->add('Set-cookie' => $securecookie);
 <head>      }
 <title>Successful Login to the LearningOnline Network with CAPA</title>      if ($defaultcookie) {
 $startupremote          $r->headers_out->add('Set-cookie' => $defaultcookie);
 </head>      }
 $bodytag      $r->send_http_header;
 $setflags  
 $windowinfo      my ($start_page,$js,$pagebody,$end_page);
 <h1>$lt{'wel'}</h1>      if ($env{'request.lti.login'}) {
 $lt{'mes'}.<p>          $args = {'only_body' => 1};
 <a href="/adm/$lt{'log'}">$lt{'pro'}?</a></p>          if ($env{'request.lti.target'} eq '') {
 $remoteinfo              my $ltitarget = (($destination =~ /\?/) ? '&' : '?').
 $maincall                              'ltitarget=iframe';
 $continuelink              $js = <<"ENDJS";
 </body>  
 </html>  <script type="text/javascript">
 ENDSUCCESS  // <![CDATA[
 }  function setLTItarget() {
       var newloc = '$destination';
 # --------------------------------------------------------------- Failed login!      if (parent !== window) {
           newloc += '$ltitarget';
 sub failed {      }
     my ($r,$message) = @_;      window.location.href=newloc;
     my $bodytag=&Apache::loncommon::bodytag('Unsuccessful Login');  }
     my $add=&addcontent();  // ]]>
     $r->send_cgi_header(<<ENDFHEADER);  </script>
 Content-type: text/html$add  
   ENDJS
 ENDFHEADER              $args->{'add_entries'} = {'onload' => "javascript:setLTItarget();"};
     $r->print(<<ENDFAILED);              $pagebody =  '<noscript><span class="LC_warning">'
 <html>                          .&mt('Use of LON-CAPA requires Javascript to be enabled in your web browser.')
 <head>                          .'</span></noscript>';
 <title>Unsuccessful Login to the LearningOnline Network with CAPA</title>          } else {
 </head>              $args->{'redirect'} = [0,$destination,1];
 $bodytag          }
 <h1>Sorry ...</h1>          $start_page=&Apache::loncommon::start_page('',$js,$args);
 <p><b>$message</b></p>      } else {
 <p>Please <a href="/adm/login?username=$FORM{'uname'}&domain=$FORM{'udom'}">log in again</a>.</p>          $args->{'redirect'} = [0,$destination];
 <p>          $start_page=&Apache::loncommon::start_page('Successful Login',
 <a href="/adm/loginproblems.html">Problems?</a></p>                                                     $js,$args);
 </body>  
 </html>          my %lt=&Apache::lonlocal::texthash(
 ENDFAILED             'wel' => 'Welcome',
 }             'pro' => 'Login problems?',
             );
 # --------------------------------------------------------------------- Charset          $pagebody = "<h1>$lt{'wel'}</h1>\n".
                       &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
 sub addcontent {          my $loginhelp = &loginhelpdisplay($domain);
     my $encoding=&Apache::lonlocal::current_encoding;          if ($loginhelp) {
     if ($encoding) {              $pagebody .= '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
  return '; charset='.$encoding;          }
     } else {      }
  return '';      $end_page = &Apache::loncommon::end_page();
     }      $r->print(<<ENDSUCCESS);
 }  $start_page
   $windowinfo
 # ------------------------------------------------------------------ Rerouting!  $pagebody
   $end_page
 sub reroute {  ENDSUCCESS
     my $r=shift;      return;
     my $bodytag=&Apache::loncommon::bodytag('Rerouting');  }
     $r->send_cgi_header(<<ENDRFHEADER);  
 Content-type: text/html  # --------------------------------------------------------------- Failed login!
   
 ENDRFHEADER  sub failed {
     $r->print(<<ENDRFAILED);      my ($r,$message,$form) = @_;
 <html>      (undef,undef,undef,my $clientmathml,my $clientunicode) =
 <head>          &Apache::loncommon::decode_user_agent();
 <title>Rerouting Login to the LearningOnline Network with CAPA</title>      my $args = {};
 </head>      if ($clientunicode && !$clientmathml) {
 $bodytag          $args = {'browser.unicode' => 1};
 <h1>Sorry ...</h1>      }
 Please <a href="/">log in again</a>.  
 </body>      my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
 </html>      my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
 ENDRFAILED      my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
 }      if (&Apache::lonnet::domain($udom,'description') eq '') {
           undef($udom);
 # ---------------------------------------------------------------- Main handler      }
       my $retry = '/adm/login';
 sub handler {      if ($uname eq $form->{'uname'}) {
     my $r = shift;          $retry .= '?username='.$uname;
       }
 # Are we re-routing?      if ($udom) {
     if (-e '/home/httpd/html/lon-status/reroute.txt') {          $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;
  &reroute($r);      }
  return OK;      if (exists($form->{role})) {
     }          my $role = &Apache::loncommon::cleanup_html($form->{role});
           if ($role ne '') {
     &Apache::lonlocal::get_language_handle($r);              $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;
           }
 # -------------------------------- Prevent users from attempting to login twice      }
     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));      if (exists($form->{symb})) {
     my $lonid=$cookies{'lonID'};          my $symb = &Apache::loncommon::cleanup_html($form->{symb});
     my $cookie;          if ($symb ne '') {
     if ($lonid) {              $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;
  my $handle=$lonid->value;          }
         $handle=~s/\W//g;      }
         my $lonidsdir=$r->dir_config('lonIDsDir');      if (exists($form->{firsturl})) {
         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {          my $firsturl = &Apache::loncommon::cleanup_html($form->{firsturl});
 # Indeed, a valid token is found          if ($firsturl ne '') {
     $r->send_cgi_header(<<ENDFHEADER);              $retry .= (($retry=~/\?/)?'&amp;':'?').'firsturl='.$firsturl;
 Content-type: text/html          }
       }
 ENDFHEADER      my $end_page = &Apache::loncommon::end_page();
     my $bodytag=&Apache::loncommon::bodytag('Already logged in');      &Apache::loncommon::content_type($r,'text/html');
     $r->print(<<ENDFAILED);      $r->send_http_header;
 <html>      my @actions =
 <head>           (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
 <title>Already logged in</title>      my $loginhelp = &loginhelpdisplay($udom);
 </head>      if ($loginhelp) {
 $bodytag          push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
 <h1>You are already logged in</h1>      }
 <p>Please either <a href="/adm/roles">continue the current session</a> or      #FIXME: link to helpdesk might be added here
 <a href="/adm/logout">logout</a>.</p>  
 <p>      $r->print(
 <a href="/adm/loginproblems.html">Problems?</a></p>         $start_page
 </body>        .'<h2>'.&mt('Sorry ...').'</h2>'
 </html>        .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
 ENDFAILED        .&Apache::lonhtmlcommon::actionbox(\@actions)
            return OK;        .$end_page
  }      );
     }   }
   
 # ---------------------------------------------------- No valid token, continue  # ------------------------------------------------------------------ Rerouting!
   
   sub reroute {
     my $buffer;      my ($r) = @_;
     $r->read($buffer,$r->header_in('Content-length'),0);      &Apache::loncommon::content_type($r,'text/html');
     my @pairs=split(/&/,$buffer);      $r->send_http_header;
     my $pair; my $name; my $value;      my $msg='<b>'.&mt('Sorry ...').'</b><br />'
     undef %FORM;             .&mt('Please [_1]log in again[_2].');
     %FORM=();      &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
     foreach $pair (@pairs) {  }
        ($name,$value) = split(/=/,$pair);  
        $value =~ tr/+/ /;  # ---------------------------------------------------------------- Main handler
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;  
        $FORM{$name}=$value;  sub handler {
     }       my $r = shift;
       my $londocroot = $r->dir_config('lonDocRoot');
     if ((!$FORM{'uname'}) || (!$FORM{'upass0'}) || (!$FORM{'udom'})) {  # Are we re-routing?
  failed($r,'Username, password and domain need to be specified.');      if (-e "$londocroot/lon-status/reroute.txt") {
         return OK;   &reroute($r);
     }   return OK;
       }
 # split user logging in and "su"-user  
       &Apache::lonlocal::get_language_handle($r);
     ($FORM{'uname'},$FORM{'suname'})=split(/\:/,$FORM{'uname'});  
     $FORM{'uname'} =~ s/\W//g;  # -------------------------------- Prevent users from attempting to login twice
     $FORM{'suname'} =~ s/\W//g;      my $handle = &Apache::lonnet::check_for_valid_session($r);
     $FORM{'udom'}  =~ s/\W//g;      if ($handle ne '') {
           my $lonidsdir=$r->dir_config('lonIDsDir');
     my $role   = $r->dir_config('lonRole');          if ($handle=~/^publicuser\_/) {
     my $domain = $r->dir_config('lonDefDomain');  # For "public user" - remove it, we apparently really want to login
     my $prodir = $r->dir_config('lonUsersDir');              unlink($r->dir_config('lonIDsDir')."/$handle.id");
           } else {
 # ---------------------------------------- Get the information from login token  # Indeed, a valid token is found
               &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$FORM{'logtoken'},      &Apache::loncommon::content_type($r,'text/html');
                                       $FORM{'serverid'});      $r->send_http_header;
       my $start_page =
     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {          &Apache::loncommon::start_page('Already logged in');
  failed($r,'Information needed to verify your login information is missing, inaccessible or expired.');      my $end_page =
         return OK;          &Apache::loncommon::end_page();
     } else {              my $dest = '/adm/roles';
         unless (&Apache::lonnet::reply('tmpdel:'.$FORM{'logtoken'},              if ($env{'form.firsturl'} ne '') {
                                          $FORM{'serverid'}) eq 'ok') {                  $dest = $env{'form.firsturl'};
             &failed($r,'Session could not be opened.');              }
  }              $r->print(
     }                 $start_page
     my ($key,$firsturl)=split(/&/,$tmpinfo);                .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
                 .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
     my $keybin=pack("H16",$key);                      ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
                 .'</p>'
     my $cipher;                .$end_page
     if ($Crypt::DES::VERSION>=2.03) {              );
  $cipher=new Crypt::DES $keybin;              return OK;
     }          }
     else {      }
  $cipher=new DES $keybin;  
     }  # ---------------------------------------------------- No valid token, continue
     my $upass='';  
     for (my $i=0;$i<=2;$i++) {  
  my $chunk=      my $buffer;
     $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},0,16))));      if ($r->header_in('Content-length') > 0) {
    $r->read($buffer,$r->header_in('Content-length'),0);
  $chunk.=      }
     $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},16,16))));      my %form;
       foreach my $pair (split(/&/,$buffer)) {
  $chunk=substr($chunk,1,ord(substr($chunk,0,1)));         my ($name,$value) = split(/=/,$pair);
  $upass.=$chunk;         $value =~ tr/+/ /;
     }         $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
          $form{$name}=$value;
 # ---------------------------------------------------------------- Authenticate      }
     my $authhost=Apache::lonnet::authenticate($FORM{'uname'},  
                                               $upass,      if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
                                               $FORM{'udom'});   &failed($r,'Username, password and domain need to be specified.',
        \%form);
 # --------------------------------------------------------------------- Failed?          return OK;
       }
     if ($authhost eq 'no_host') {  
  failed($r,'Username and/or password could not be authenticated.');  # split user logging in and "su"-user
         return OK;  
     }      ($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
       $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
     if (($firsturl eq '') ||       $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
  ($firsturl=~/^\/adm\/(logout|remote)/)) {      $form{'udom'}  = &LONCAPA::clean_domain($form{'udom'});
  $firsturl='/adm/roles';      $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
     }  
 # --------------------------------- Are we attempting to login as somebody else?      my $role   = $r->dir_config('lonRole');
     if ($FORM{'suname'}) {      my $domain = $r->dir_config('lonDefDomain');
 # ------------ see if the original user has enough privileges to pull this stunt      my $prodir = $r->dir_config('lonUsersDir');
  if (&Apache::lonnet::privileged($FORM{'uname'},$FORM{'udom'})) {      my $contact_name = &mt('LON-CAPA helpdesk');
 # ---------------------------------------------------- see if the su-user exists  
     unless (&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'})  # ---------------------------------------- Get the information from login token
  eq 'no_host') {  
  &Apache::lonnet::logthis(&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'}));      my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
 # ------------------------------ see if the su-user is not too highly privileged                                        $form{'serverid'});
  unless (&Apache::lonnet::privileged($FORM{'suname'},$FORM{'udom'})) {  
 # -------------------------------------------------------- actually switch users      if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
     &Apache::lonnet::logperm('User '.$FORM{'uname'}.' at '.$FORM{'udom'}.          ($tmpinfo eq 'no_such_host')) {
  ' logging in as '.$FORM{'suname'});   &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
     $FORM{'uname'}=$FORM{'suname'};          return OK;
  } else {      } else {
     &Apache::lonnet::logthis('Attempted switch user to privileged user');   my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
  }     $form{'serverid'});
     }          if ( $reply ne 'ok' ) {
  } else {              &failed($r,'Session could not be opened.',\%form);
     &Apache::lonnet::logthis('Non-privileged user attempting switch user');      &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
  }      return OK;
     }   }
     &success($r,$FORM{'uname'},$FORM{'udom'},$authhost,$firsturl);      }
     return OK;  
 }      if (!&Apache::lonnet::domain($form{'udom'})) {
           &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
 1;          return OK;
 __END__      }
   
       my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
       if ($rolestr) {
           $rolestr = &unescape($rolestr);
       }
       if ($symbstr) {
           $symbstr= &unescape($symbstr);
       }
       if ($iptokenstr) {
           $iptokenstr = &unescape($iptokenstr);
       }
       if ($firsturl =~ m{^/tiny/$match_domain/\w+$}) {
           $form{'firsturl'} = $firsturl;
       }
       if ($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 ($form{'suname'}) {
           my ($suname,$sudom,$sudomref);
           $suname = $form{'suname'};
           $sudom = $form{'udom'};
           if ($form{'sudom'}) {
               unless ($sudom eq $form{'sudom'}) {
                   if (&Apache::lonnet::domain($form{'sudom'})) {
                       $sudomref = [$form{'sudom'}];
                       $sudom = $form{'sudom'};
                   }
               }
           }
   # ------------ see if the original user has enough privileges to pull this stunt
    if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
   # ---------------------------------------------------- see if the su-user exists
       unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
   # ------------------------------ see if the su-user is not too highly privileged
    if (&Apache::lonnet::privileged($suname,$sudom)) {
                       &Apache::lonnet::logthis('Attempted switch user to privileged user');
                   } else {
                       my $noprivswitch;
   #
   # su-user's home server and user's home server must have one of:
   # (a) same domain
   # (b) same primary library server for the two domains
   # (c) same "internet domain" for primary library server(s) for home servers' domains
   #
                       my $suprim = &Apache::lonnet::domain($sudom,'primary');
                       my $suintdom = &Apache::lonnet::internet_dom($suprim);
                       unless ($sudom eq $form{'udom'}) {
                           my $uprim = &Apache::lonnet::domain($form{'udom'},'primary');
                           my $uintdom = &Apache::lonnet::internet_dom($uprim);
                           unless ($suprim eq $uprim) {
                               unless ($suintdom eq $uintdom) {
                                   &Apache::lonnet::logthis('Attempted switch user '
                                      .'to user with different "internet domain".');                        
                                   $noprivswitch = 1;
                               }
                           }
                       }
   
                       unless ($noprivswitch) {
   #
   # server where log-in occurs must have same "internet domain" as su-user's home
   # server
   #
                           my $lonhost = $r->dir_config('lonHostID');
                           my $hostintdom = &Apache::lonnet::internet_dom($lonhost);
                           if ($hostintdom ne $suintdom) {
                               &Apache::lonnet::logthis('Attempted switch user on a '
                                   .'server with a different "internet domain".');
                           } else {
   
   # -------------------------------------------------------- actually switch users
   
               &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.
                                 $form{'udom'}.' logging in as '.$suname.':'.$sudom);
               $form{'uname'}=$suname;
                               if ($form{'udom'} ne $sudom) {
                                   $form{'udom'}=$sudom;
                               }
                           }
                       }
    }
       }
    } 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.1.67  
changed lines
  Added in v.1.155

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