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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 1.34 2004/02/02 18:50:21 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: # YEAR=2000
   30: # 6/15,16/11,22/11,
   31: # YEAR=2001
   32: # 01/06,01/11,6/1,9/25,9/28,11/22,12/25,12/26,
   33: # 01/06/01,05/04,05/05,05/09 Gerd Kortemeyer
   34: # YEAR=2002
   35: # 1/4 Gerd Kortemeyer
   36: ###
   37: 
   38: package Apache::loncacc;
   39: 
   40: use strict;
   41: use Apache::Constants qw(:common :http :methods REDIRECT);
   42: use Apache::File;
   43: use CGI::Cookie();
   44: use Fcntl qw(:flock);
   45: use Apache::lonlocal;
   46: use Apache::lonnet();
   47: 
   48: 
   49: sub constructaccess {
   50:     my ($url,$ownerdomain)=@_;
   51:     my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)(\w+)\//);
   52:     unless (($ownername) && ($ownerdomain)) { return ''; }
   53:     # We do not allow editing of previous versions of files.
   54:     if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }
   55:     my @possibledomains = &Apache::lonnet::current_machine_domains();
   56:     if ($ownername eq $ENV{'user.name'}) {
   57: 	foreach my $domain (@possibledomains) {
   58: 	    if ($domain eq $ENV{'user.domain'}) {
   59: 		return ($ownername,$domain);
   60: 	    }
   61: 	}
   62:     }
   63:     
   64:     foreach my $domain (@possibledomains) {
   65: 	my $capriv='user.priv.ca./'.$domain.'/'.$ownername.'./';
   66: 	foreach (keys %ENV) {
   67: 	    if ($_ eq $capriv) {
   68: 		return ($ownername,$domain);
   69: 	    }
   70: 	}
   71:     }
   72:     return '';
   73: }
   74: 
   75: sub handler {
   76:     my $r = shift;
   77:     my $requrl=$r->uri;
   78:     $ENV{'request.editurl'}=$requrl;
   79:     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
   80:     my $lonid=$cookies{'lonID'};
   81:     my $cookie;
   82:     if ($lonid) {
   83: 	my $handle=$lonid->value;
   84:         $handle=~s/\W//g;
   85:         my $lonidsdir=$r->dir_config('lonIDsDir');
   86:         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
   87: 
   88: # ------------------------------------------------------ Initialize Environment
   89: 
   90:             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
   91: 
   92: # --------------------------------------------------------- Initialize Language
   93:  
   94:  	    &Apache::lonlocal::get_language_handle($r);
   95: 
   96: # -------------------------------------------------------------- Resource State
   97: 
   98:             $ENV{'request.state'}    = "construct";
   99:             $ENV{'request.filename'} = $r->filename;
  100: 
  101:             unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) {
  102:                 $r->log_reason("Unauthorized $requrl", $r->filename); 
  103: 	        return HTTP_NOT_ACCEPTABLE;
  104:             }
  105: # Construction space needs Remote to work
  106:             if ($ENV{'environment.remote'} eq 'off') {
  107: 	        $r->content_type('text/html');
  108:                 $r->header_out(Location => 
  109:                     'http://'.$r->server->server_hostname.
  110:                     '/adm/remote?action=launch&url='.
  111:                     &Apache::lonnet::escape($requrl));
  112:                 return REDIRECT;
  113:             }
  114: 
  115: # -------------------------------------------------------- Load POST parameters
  116: 
  117: 	    &Apache::loncommon::get_posted_cgi($r);
  118: 
  119:             return OK; 
  120:         } else { 
  121:             $r->log_reason("Cookie $handle not valid", $r->filename) 
  122:         };
  123:     }
  124: 
  125: # ----------------------------------------------- Store where they wanted to go
  126: 
  127:     $ENV{'request.firsturl'}=$requrl;
  128:     return FORBIDDEN;
  129: }
  130: 
  131: 1;
  132: __END__
  133: 
  134: =head1 NAME
  135: 
  136: Apache::lonacc - Cookie Based Access Handler for Construction Area
  137: 
  138: =head1 SYNOPSIS
  139: 
  140: Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.conf:
  141: 
  142:  PerlAccessHandler       Apache::loncacc
  143: 
  144: =head1 INTRODUCTION
  145: 
  146: This module enables cookie based authentication for construction area
  147: and is used to control access for three (essentially equivalent) URIs.
  148: 
  149:  <LocationMatch "^/priv.*">
  150:  <LocationMatch "^/\~.*">
  151:  <LocationMatch "^/\~.*/$">
  152: 
  153: Whenever the client sends the cookie back to the server, 
  154: if the cookie is missing or invalid, the user is re-challenged
  155: for login information.
  156: 
  157: This is part of the LearningOnline Network with CAPA project
  158: described at http://www.lon-capa.org.
  159: 
  160: =head1 HANDLER SUBROUTINE
  161: 
  162: This routine is called by Apache and mod_perl.
  163: 
  164: =over 4
  165: 
  166: =item *
  167: 
  168: load POST parameters
  169: 
  170: =item *
  171: 
  172: store where they wanted to go (first url entered)
  173: 
  174: =back
  175: 
  176: =head1 OTHERSUBROUTINES
  177: 
  178: =over 4
  179: 
  180: =item *
  181: 
  182: constructaccess($url,$ownerdomain) : See if the owner domain and name
  183: in the URL match those in the expected environment.  If so, return 
  184: two element list ($ownername,$ownerdomain).  Else, return null string.
  185: 
  186: =back
  187: 
  188: =cut
  189: 
  190: 
  191: 
  192: 
  193: 
  194: 
  195: