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- supporting authors on multidomain machines
  - this works, but requires that all users that author have unique usernames
    ( I.e. albertel@basement and albertel@annarbor will end up accessing the same /home/albertel/public_html)
- I plan on isntalling this on s17.lite.msu.edu to support the serway@brookscole user

    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 1.33 2004/01/27 22:54:59 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:     &Apache::lonnet::logthis("got domains of ".join(':',@possibledomains));
   57:     if ($ownername eq $ENV{'user.name'}) {
   58: 	foreach my $domain (@possibledomains) {
   59: 	    if ($domain eq $ENV{'user.domain'}) {
   60: 		return ($ownername,$domain);
   61: 	    }
   62: 	}
   63:     }
   64:     
   65: 
   66:     foreach my $domain (@possibledomains) {
   67: 	my $capriv='user.priv.ca./'.$domain.'/'.$ownername.'./';
   68: 	foreach (keys %ENV) {
   69: 	    if ($_ eq $capriv) {
   70: 		return ($ownername,$domain);
   71: 	    }
   72: 	}
   73:     }
   74:     return '';
   75: }
   76: 
   77: sub handler {
   78:     my $r = shift;
   79:     my $requrl=$r->uri;
   80:     $ENV{'request.editurl'}=$requrl;
   81:     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
   82:     my $lonid=$cookies{'lonID'};
   83:     my $cookie;
   84:     if ($lonid) {
   85: 	my $handle=$lonid->value;
   86:         $handle=~s/\W//g;
   87:         my $lonidsdir=$r->dir_config('lonIDsDir');
   88:         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
   89: 
   90: # ------------------------------------------------------ Initialize Environment
   91: 
   92:             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
   93: 
   94: # --------------------------------------------------------- Initialize Language
   95:  
   96:  	    &Apache::lonlocal::get_language_handle($r);
   97: 
   98: # -------------------------------------------------------------- Resource State
   99: 
  100:             $ENV{'request.state'}    = "construct";
  101:             $ENV{'request.filename'} = $r->filename;
  102: 
  103:             unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) {
  104:                 $r->log_reason("Unauthorized $requrl", $r->filename); 
  105: 	        return HTTP_NOT_ACCEPTABLE;
  106:             }
  107: # Construction space needs Remote to work
  108:             if ($ENV{'environment.remote'} eq 'off') {
  109: 	        $r->content_type('text/html');
  110:                 $r->header_out(Location => 
  111:                     'http://'.$r->server->server_hostname.
  112:                     '/adm/remote?action=launch&url='.
  113:                     &Apache::lonnet::escape($requrl));
  114:                 return REDIRECT;
  115:             }
  116: 
  117: # -------------------------------------------------------- Load POST parameters
  118: 
  119: 	    &Apache::loncommon::get_posted_cgi($r);
  120: 
  121:             return OK; 
  122:         } else { 
  123:             $r->log_reason("Cookie $handle not valid", $r->filename) 
  124:         };
  125:     }
  126: 
  127: # ----------------------------------------------- Store where they wanted to go
  128: 
  129:     $ENV{'request.firsturl'}=$requrl;
  130:     return FORBIDDEN;
  131: }
  132: 
  133: 1;
  134: __END__
  135: 
  136: =head1 NAME
  137: 
  138: Apache::lonacc - Cookie Based Access Handler for Construction Area
  139: 
  140: =head1 SYNOPSIS
  141: 
  142: Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.conf:
  143: 
  144:  PerlAccessHandler       Apache::loncacc
  145: 
  146: =head1 INTRODUCTION
  147: 
  148: This module enables cookie based authentication for construction area
  149: and is used to control access for three (essentially equivalent) URIs.
  150: 
  151:  <LocationMatch "^/priv.*">
  152:  <LocationMatch "^/\~.*">
  153:  <LocationMatch "^/\~.*/$">
  154: 
  155: Whenever the client sends the cookie back to the server, 
  156: if the cookie is missing or invalid, the user is re-challenged
  157: for login information.
  158: 
  159: This is part of the LearningOnline Network with CAPA project
  160: described at http://www.lon-capa.org.
  161: 
  162: =head1 HANDLER SUBROUTINE
  163: 
  164: This routine is called by Apache and mod_perl.
  165: 
  166: =over 4
  167: 
  168: =item *
  169: 
  170: load POST parameters
  171: 
  172: =item *
  173: 
  174: store where they wanted to go (first url entered)
  175: 
  176: =back
  177: 
  178: =head1 OTHERSUBROUTINES
  179: 
  180: =over 4
  181: 
  182: =item *
  183: 
  184: constructaccess($url,$ownerdomain) : See if the owner domain and name
  185: in the URL match those in the expected environment.  If so, return 
  186: two element list ($ownername,$ownerdomain).  Else, return null string.
  187: 
  188: =back
  189: 
  190: =cut
  191: 
  192: 
  193: 
  194: 
  195: 
  196: 
  197: