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Diff for /loncom/auth/loncacc.pm between versions 1.38 and 1.59

version 1.38, 2005/04/07 06:56:21 version 1.59, 2011/11/12 19:37:40
Line 27 Line 27
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
   
 package Apache::loncacc;  =pod
   
 use strict;  
 use Apache::Constants qw(:common :http :methods REDIRECT);  
 use Apache::File;  
 use CGI::Cookie();  
 use Fcntl qw(:flock);  
 use Apache::lonlocal;  
 use Apache::lonnet;  
   
   
 sub constructaccess {  
     my ($url,$ownerdomain)=@_;  
     my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)(\w+)\//);  
     unless (($ownername) && ($ownerdomain)) { return ''; }  
     # We do not allow editing of previous versions of files.  
     if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }  
     my @possibledomains = &Apache::lonnet::current_machine_domains();  
     if ($ownername eq $env{'user.name'}) {  
  foreach my $domain (@possibledomains) {  
     if ($domain eq $env{'user.domain'}) {  
  return ($ownername,$domain);  
     }  
  }  
     }  
       
     foreach my $domain (@possibledomains) {  
  my $capriv='user.priv.ca./'.$domain.'/'.$ownername.'./';  
  foreach (keys %env) {  
     if ($_ eq $capriv) {  
  return ($ownername,$domain);  
     }  
  }  
     }  
     return '';  
 }  
   
 sub handler {  
     my $r = shift;  
     my $requrl=$r->uri;  
     $env{'request.editurl'}=$requrl;  
     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));  
     my $lonid=$cookies{'lonID'};  
     my $cookie;  
     if ($lonid) {  
  my $handle=$lonid->value;  
         $handle=~s/\W//g;  
         my $lonidsdir=$r->dir_config('lonIDsDir');  
         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {  
   
 # ------------------------------------------------------ Initialize Environment  
   
             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);  
   
 # --------------------------------------------------------- Initialize Language  
    
      &Apache::lonlocal::get_language_handle($r);  
   
 # -------------------------------------------------------------- Resource State  
   
             $env{'request.state'}    = "construct";  
             $env{'request.filename'} = $r->filename;  
   
             unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) {  
                 $r->log_reason("Unauthorized $requrl", $r->filename);   
         return HTTP_NOT_ACCEPTABLE;  
             }  
   
 # -------------------------------------------------------- Load POST parameters  
   
     &Apache::loncommon::get_posted_cgi($r);  
   
             return OK;   
         } else {   
             $r->log_reason("Cookie $handle not valid", $r->filename)   
         };  
     }  
   
 # ----------------------------------------------- Store where they wanted to go  
   
     $env{'request.firsturl'}=$requrl;  
     return FORBIDDEN;  
 }  
   
 1;  
 __END__  
   
 =head1 NAME  =head1 NAME
   
Line 127  Invoked (for various locations) by /etc/ Line 42  Invoked (for various locations) by /etc/
 =head1 INTRODUCTION  =head1 INTRODUCTION
   
 This module enables cookie based authentication for construction area  This module enables cookie based authentication for construction area
 and is used to control access for three (essentially equivalent) URIs.  and is used to control access for the following two types of URI 
   (one for files, and one for directories):
   
  <LocationMatch "^/priv.*">   <LocationMatch "^/priv.*">
  <LocationMatch "^/\~.*">   <LocationMatch "^/priv.*/$">
  <LocationMatch "^/\~.*/$">  
   
 Whenever the client sends the cookie back to the server,   Whenever the client sends the cookie back to the server, 
 if the cookie is missing or invalid, the user is re-challenged  if the cookie is missing or invalid, the user is re-challenged
Line 158  store where they wanted to go (first url Line 73  store where they wanted to go (first url
   
 =head1 OTHERSUBROUTINES  =head1 OTHERSUBROUTINES
   
 =over 4  =over
   
 =item *  =item constructaccess($url,$setpriv)
   
 constructaccess($url,$ownerdomain) : See if the owner domain and name  See if the owner domain and name
 in the URL match those in the expected environment.  If so, return   in the URL match those in the expected environment.  If so, return 
 two element list ($ownername,$ownerdomain).  Else, return null string.  three element list ($ownername,$ownerdomain,$ownerhome).  
   
   Otherwise return the null string.
   
   If second argument 'setpriv' is true, it assigns the privileges,
   and returns the same three element list, unless the owner has
   blocked "ad hoc" Domain Coordinator access to the Author Space,
   in which case the null string is returned.
   
 =back  =back
   
 =cut  =cut
   
   
   package Apache::loncacc;
   
   use strict;
   use Apache::Constants qw(:common :http :methods REDIRECT);
   use Fcntl qw(:flock);
   use Apache::lonlocal;
   use Apache::lonnet;
   use Apache::lonacc;
   use LONCAPA qw(:DEFAULT :match);
   
   sub constructaccess {
       my ($url,$setpriv)=@_;
   
   # We do not allow editing of previous versions of files
       if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }
   
   # Get username and domain from URL
       my $londocroot = $Apache::lonnet::perlvar{'lonDocRoot'};
       my ($ownername,$ownerdomain,$ownerhome);
   
       ($ownerdomain,$ownername) = 
           ($url=~ m{^(?:\Q$londocroot\E|)/priv/($match_domain)/($match_username)/});
   
   # The URL does not really point to any authorspace, forget it
       unless (($ownername) && ($ownerdomain)) { return ''; }
   
   # Now we need to see if the user has access to the authorspace of
   # $ownername at $ownerdomain
   
       if (($ownername eq $env{'user.name'}) && ($ownerdomain eq $env{'user.domain'})) {
   # Real author for this?
          $ownerhome = $env{'user.home'};
          if (exists($env{'user.priv.au./'.$ownerdomain.'/./'})) {
             return ($ownername,$ownerdomain,$ownerhome);
          }
       } else {
   # Co-author for this?
    if (exists($env{'user.priv.ca./'.$ownerdomain.'/'.$ownername.'./'}) ||
       exists($env{'user.priv.aa./'.$ownerdomain.'/'.$ownername.'./'}) ) {
       $ownerhome = &Apache::lonnet::homeserver($ownername,$ownerdomain);
       return ($ownername,$ownerdomain,$ownerhome);
    }
       }
   # We don't have any access right now. If we are not possibly going to do anything about this,
   # we might as well leave
      unless ($setpriv) { return ''; }
   
   # Backdoor access?
       my $allowed=&Apache::lonnet::allowed('eco',$ownerdomain);
   # Nope
       unless ($allowed) { return ''; }
   # Looks like we may have access, but could be locked by the owner of the construction space
       if ($allowed eq 'U') {
           my %blocked=&Apache::lonnet::get('environment',['domcoord.author'],
                                            $ownerdomain,$ownername);
   # Is blocked by owner
           if ($blocked{'domcoord.author'} eq 'blocked') { return ''; }
       }
       if (($allowed eq 'F') || ($allowed eq 'U')) {
   # Grant temporary access
           my $then=$env{'user.login.time'};
           my $update==$env{'user.update.time'};
           if (!$update) { $update = $then; }
           my $refresh=$env{'user.refresh.time'};
           if (!$refresh) { $refresh = $update; }
           my $now = time;
           &Apache::lonnet::check_adhoc_privs($ownerdomain,$ownername,
                                              $update,$refresh,$now,'ca',
                                              'constructaccess');
           $ownerhome = &Apache::lonnet::homeserver($ownername,$ownerdomain);
           return($ownername,$ownerdomain,$ownerhome);
       }
   # No business here
       return '';
   }
   
   sub handler {
       my $r = shift;
       my $requrl=$r->uri;
       $env{'request.editurl'}=$requrl;
   
       my $handle =  &Apache::lonnet::check_for_valid_session($r);
       if ($handle ne '') {
   
   # ------------------------------------------------------ Initialize Environment
           my $lonidsdir=$r->dir_config('lonIDsDir');
    &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
   
   # --------------------------------------------------------- Initialize Language
    
    &Apache::lonlocal::get_language_handle($r);
   
   # -------------------------------------------------------------- Resource State
   
    $env{'request.state'}    = "construct";
    $env{'request.filename'} = $r->filename;
   
    my $allowed;
    my ($ownername,$ownerdom,$ownerhome) = &constructaccess($requrl,'setpriv');
           if (($ownername ne '') && ($ownerdom ne '') && ($ownerhome ne '')) {
               unless ($ownerhome eq 'no_host') {
                   my @hosts = &Apache::lonnet::current_machine_ids();
                   if (grep(/^\Q$ownerhome\E$/,@hosts)) {
                       $allowed = 1;
                   }
               }
           }
   
           unless ($allowed) {
       $r->log_reason("Unauthorized $requrl", $r->filename); 
       return HTTP_NOT_ACCEPTABLE;
    }
   
   # -------------------------------------------------------- Load POST parameters
   
    &Apache::lonacc::get_posted_cgi($r);
   
    return OK; 
       } else {
    $r->log_reason("Cookie $handle not valid", $r->filename) 
       }
   
   # ----------------------------------------------- Store where they wanted to go
   
       $env{'request.firsturl'}=$requrl;
       return FORBIDDEN;
   }
   
   1;
   __END__
   
Removed from v.1.38  
changed lines
  Added in v.1.59

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