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    1: # The LearningOnline Network
    2: # Cookie Based Access Handler for Construction Area
    3: # (lonacc: 5/21/99,5/22,5/29,5/31 Gerd Kortemeyer)
    4: #
    5: # $Id: loncacc.pm,v 1.42 2006/11/23 01:49:41 albertel Exp $
    6: #
    7: # Copyright Michigan State University Board of Trustees
    8: #
    9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   10: #
   11: # LON-CAPA is free software; you can redistribute it and/or modify
   12: # it under the terms of the GNU General Public License as published by
   13: # the Free Software Foundation; either version 2 of the License, or
   14: # (at your option) any later version.
   15: #
   16: # LON-CAPA is distributed in the hope that it will be useful,
   17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   19: # GNU General Public License for more details.
   20: #
   21: # You should have received a copy of the GNU General Public License
   22: # along with LON-CAPA; if not, write to the Free Software
   23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   24: #
   25: # /home/httpd/html/adm/gpl.txt
   26: #
   27: # http://www.lon-capa.org/
   28: #
   29: 
   30: package Apache::loncacc;
   31: 
   32: use strict;
   33: use Apache::Constants qw(:common :http :methods REDIRECT);
   34: use CGI::Cookie();
   35: use Fcntl qw(:flock);
   36: use Apache::lonlocal;
   37: use Apache::lonnet;
   38: use Apache::lonacc;
   39: 
   40: sub constructaccess {
   41:     my ($url,$ownerdomain)=@_;
   42:     my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)(\w+)\//);
   43:     unless (($ownername) && ($ownerdomain)) { return ''; }
   44:     # We do not allow editing of previous versions of files.
   45:     if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }
   46:     my @possibledomains = &Apache::lonnet::current_machine_domains();
   47:     if ($ownername eq $env{'user.name'}) {
   48: 	foreach my $domain (@possibledomains) {
   49: 	    if ($domain eq $env{'user.domain'}) {
   50: 		return ($ownername,$domain);
   51: 	    }
   52: 	}
   53:     }
   54:     
   55:     foreach my $domain (@possibledomains) {
   56: 	if (exists($env{'user.priv.ca./'.$domain.'/'.$ownername.'./'}) ||
   57: 	    exists($env{'user.priv.aa./'.$domain.'/'.$ownername.'./'}) ) {
   58: 	    return ($ownername,$domain);
   59: 	}
   60:     }
   61:     return '';
   62: }
   63: 
   64: sub handler {
   65:     my $r = shift;
   66:     my $requrl=$r->uri;
   67:     $env{'request.editurl'}=$requrl;
   68:     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
   69:     my $lonid=$cookies{'lonID'};
   70:     my $cookie;
   71:     if ($lonid) {
   72:       	my $handle=&LONCAPA::clean_handle($lonid->value);
   73:         my $lonidsdir=$r->dir_config('lonIDsDir');
   74:         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
   75: 
   76: # ------------------------------------------------------ Initialize Environment
   77: 
   78:             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
   79: 
   80: # --------------------------------------------------------- Initialize Language
   81:  
   82:  	    &Apache::lonlocal::get_language_handle($r);
   83: 
   84: # -------------------------------------------------------------- Resource State
   85: 
   86:             $env{'request.state'}    = "construct";
   87:             $env{'request.filename'} = $r->filename;
   88: 
   89:             unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) {
   90:                 $r->log_reason("Unauthorized $requrl", $r->filename); 
   91: 	        return HTTP_NOT_ACCEPTABLE;
   92:             }
   93: 
   94: # -------------------------------------------------------- Load POST parameters
   95: 
   96: 	    &Apache::lonacc::get_posted_cgi($r);
   97: 
   98:             return OK; 
   99:         } else { 
  100:             $r->log_reason("Cookie $handle not valid", $r->filename) 
  101:         };
  102:     }
  103: 
  104: # ----------------------------------------------- Store where they wanted to go
  105: 
  106:     $env{'request.firsturl'}=$requrl;
  107:     return FORBIDDEN;
  108: }
  109: 
  110: 1;
  111: __END__
  112: 
  113: =head1 NAME
  114: 
  115: Apache::lonacc - Cookie Based Access Handler for Construction Area
  116: 
  117: =head1 SYNOPSIS
  118: 
  119: Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.conf:
  120: 
  121:  PerlAccessHandler       Apache::loncacc
  122: 
  123: =head1 INTRODUCTION
  124: 
  125: This module enables cookie based authentication for construction area
  126: and is used to control access for three (essentially equivalent) URIs.
  127: 
  128:  <LocationMatch "^/priv.*">
  129:  <LocationMatch "^/\~.*">
  130:  <LocationMatch "^/\~.*/$">
  131: 
  132: Whenever the client sends the cookie back to the server, 
  133: if the cookie is missing or invalid, the user is re-challenged
  134: for login information.
  135: 
  136: This is part of the LearningOnline Network with CAPA project
  137: described at http://www.lon-capa.org.
  138: 
  139: =head1 HANDLER SUBROUTINE
  140: 
  141: This routine is called by Apache and mod_perl.
  142: 
  143: =over 4
  144: 
  145: =item *
  146: 
  147: load POST parameters
  148: 
  149: =item *
  150: 
  151: store where they wanted to go (first url entered)
  152: 
  153: =back
  154: 
  155: =head1 OTHERSUBROUTINES
  156: 
  157: =over 4
  158: 
  159: =item *
  160: 
  161: constructaccess($url,$ownerdomain) : See if the owner domain and name
  162: in the URL match those in the expected environment.  If so, return 
  163: two element list ($ownername,$ownerdomain).  Else, return null string.
  164: 
  165: =back
  166: 
  167: =cut
  168: 
  169: 
  170: 
  171: 
  172: 
  173: 
  174: