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Bug #4135: underprivileged "assistant co-author"
Part of Bug #1900: CUSR shows up for authors again

    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 1.39 2005/06/19 00:41:32 www 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 Apache::File;
   35: use CGI::Cookie();
   36: use Fcntl qw(:flock);
   37: use Apache::lonlocal;
   38: use Apache::lonnet;
   39: 
   40: 
   41: sub constructaccess {
   42:     my ($url,$ownerdomain)=@_;
   43:     my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)(\w+)\//);
   44:     unless (($ownername) && ($ownerdomain)) { return ''; }
   45:     # We do not allow editing of previous versions of files.
   46:     if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }
   47:     my @possibledomains = &Apache::lonnet::current_machine_domains();
   48:     if ($ownername eq $env{'user.name'}) {
   49: 	foreach my $domain (@possibledomains) {
   50: 	    if ($domain eq $env{'user.domain'}) {
   51: 		return ($ownername,$domain);
   52: 	    }
   53: 	}
   54:     }
   55:     
   56:     foreach my $domain (@possibledomains) {
   57: 	my $capriv='user.priv.ca./'.$domain.'/'.$ownername.'./';
   58: 	foreach (keys %env) {
   59: 	    if ($_ eq $capriv) {
   60: 		return ($ownername,$domain);
   61: 	    }
   62: 	}
   63: 	my $aapriv='user.priv.aa./'.$domain.'/'.$ownername.'./';
   64: 	foreach (keys %env) {
   65: 	    if ($_ eq $aapriv) {
   66: 		return ($ownername,$domain);
   67: 	    }
   68: 	}
   69:     }
   70:     return '';
   71: }
   72: 
   73: sub handler {
   74:     my $r = shift;
   75:     my $requrl=$r->uri;
   76:     $env{'request.editurl'}=$requrl;
   77:     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
   78:     my $lonid=$cookies{'lonID'};
   79:     my $cookie;
   80:     if ($lonid) {
   81: 	my $handle=$lonid->value;
   82:         $handle=~s/\W//g;
   83:         my $lonidsdir=$r->dir_config('lonIDsDir');
   84:         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
   85: 
   86: # ------------------------------------------------------ Initialize Environment
   87: 
   88:             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
   89: 
   90: # --------------------------------------------------------- Initialize Language
   91:  
   92:  	    &Apache::lonlocal::get_language_handle($r);
   93: 
   94: # -------------------------------------------------------------- Resource State
   95: 
   96:             $env{'request.state'}    = "construct";
   97:             $env{'request.filename'} = $r->filename;
   98: 
   99:             unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) {
  100:                 $r->log_reason("Unauthorized $requrl", $r->filename); 
  101: 	        return HTTP_NOT_ACCEPTABLE;
  102:             }
  103: 
  104: # -------------------------------------------------------- Load POST parameters
  105: 
  106: 	    &Apache::loncommon::get_posted_cgi($r);
  107: 
  108:             return OK; 
  109:         } else { 
  110:             $r->log_reason("Cookie $handle not valid", $r->filename) 
  111:         };
  112:     }
  113: 
  114: # ----------------------------------------------- Store where they wanted to go
  115: 
  116:     $env{'request.firsturl'}=$requrl;
  117:     return FORBIDDEN;
  118: }
  119: 
  120: 1;
  121: __END__
  122: 
  123: =head1 NAME
  124: 
  125: Apache::lonacc - Cookie Based Access Handler for Construction Area
  126: 
  127: =head1 SYNOPSIS
  128: 
  129: Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.conf:
  130: 
  131:  PerlAccessHandler       Apache::loncacc
  132: 
  133: =head1 INTRODUCTION
  134: 
  135: This module enables cookie based authentication for construction area
  136: and is used to control access for three (essentially equivalent) URIs.
  137: 
  138:  <LocationMatch "^/priv.*">
  139:  <LocationMatch "^/\~.*">
  140:  <LocationMatch "^/\~.*/$">
  141: 
  142: Whenever the client sends the cookie back to the server, 
  143: if the cookie is missing or invalid, the user is re-challenged
  144: for login information.
  145: 
  146: This is part of the LearningOnline Network with CAPA project
  147: described at http://www.lon-capa.org.
  148: 
  149: =head1 HANDLER SUBROUTINE
  150: 
  151: This routine is called by Apache and mod_perl.
  152: 
  153: =over 4
  154: 
  155: =item *
  156: 
  157: load POST parameters
  158: 
  159: =item *
  160: 
  161: store where they wanted to go (first url entered)
  162: 
  163: =back
  164: 
  165: =head1 OTHERSUBROUTINES
  166: 
  167: =over 4
  168: 
  169: =item *
  170: 
  171: constructaccess($url,$ownerdomain) : See if the owner domain and name
  172: in the URL match those in the expected environment.  If so, return 
  173: two element list ($ownername,$ownerdomain).  Else, return null string.
  174: 
  175: =back
  176: 
  177: =cut
  178: 
  179: 
  180: 
  181: 
  182: 
  183: 
  184: