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Eliminate requirement for Remote Control when entering Construction Space.

    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 1.37 2004/10/29 20:44:30 raeburn 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", $r->filename); 
  103: 	        return HTTP_NOT_ACCEPTABLE;
  104:             }
  105: 
  106: # -------------------------------------------------------- Load POST parameters
  107: 
  108: 	    &Apache::loncommon::get_posted_cgi($r);
  109: 
  110:             return OK; 
  111:         } else { 
  112:             $r->log_reason("Cookie $handle not valid", $r->filename) 
  113:         };
  114:     }
  115: 
  116: # ----------------------------------------------- Store where they wanted to go
  117: 
  118:     $ENV{'request.firsturl'}=$requrl;
  119:     return FORBIDDEN;
  120: }
  121: 
  122: 1;
  123: __END__
  124: 
  125: =head1 NAME
  126: 
  127: Apache::lonacc - Cookie Based Access Handler for Construction Area
  128: 
  129: =head1 SYNOPSIS
  130: 
  131: Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.conf:
  132: 
  133:  PerlAccessHandler       Apache::loncacc
  134: 
  135: =head1 INTRODUCTION
  136: 
  137: This module enables cookie based authentication for construction area
  138: and is used to control access for three (essentially equivalent) URIs.
  139: 
  140:  <LocationMatch "^/priv.*">
  141:  <LocationMatch "^/\~.*">
  142:  <LocationMatch "^/\~.*/$">
  143: 
  144: Whenever the client sends the cookie back to the server, 
  145: if the cookie is missing or invalid, the user is re-challenged
  146: for login information.
  147: 
  148: This is part of the LearningOnline Network with CAPA project
  149: described at http://www.lon-capa.org.
  150: 
  151: =head1 HANDLER SUBROUTINE
  152: 
  153: This routine is called by Apache and mod_perl.
  154: 
  155: =over 4
  156: 
  157: =item *
  158: 
  159: load POST parameters
  160: 
  161: =item *
  162: 
  163: store where they wanted to go (first url entered)
  164: 
  165: =back
  166: 
  167: =head1 OTHERSUBROUTINES
  168: 
  169: =over 4
  170: 
  171: =item *
  172: 
  173: constructaccess($url,$ownerdomain) : See if the owner domain and name
  174: in the URL match those in the expected environment.  If so, return 
  175: two element list ($ownername,$ownerdomain).  Else, return null string.
  176: 
  177: =back
  178: 
  179: =cut
  180: 
  181: 
  182: 
  183: 
  184: 
  185: 
  186: