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- actually returning the FORBIDDEN now

    1: # The LearningOnline Network
    2: # Access Handler for File Transfers
    3: #
    4: # $Id: lonracc.pm,v 1.10 2003/05/27 18:31:31 albertel Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: # (lonacc: Cookie Based Access Handler
   29: # 5/21/99,5/22,5/29,5/31,6/15 Gerd Kortemeyer)
   30: # 6/16,6/18,7/3,
   31: # 6/30/00 Gerd Kortemeyer
   32: 
   33: package Apache::lonracc;
   34: 
   35: use strict;
   36: use Apache::Constants qw(:common :remotehost);
   37: use Apache::lonnet();
   38: use Apache::File();
   39: 
   40: sub subscribed {
   41:     my ($filename,$id) = @_;
   42:     my $found=0;
   43:     my $expr='^'.$id.':'.$Apache::lonnet::hostip{$id}.':';
   44:     $expr =~ s/\./\\\./g;
   45:     my $sh;
   46:     if ($sh=Apache::File->new("$filename.subscription")) {
   47: 	while (my $subline=<$sh>) { if ($subline =~ /$expr/) { $found=1; } }
   48: 	$sh->close();
   49:     }
   50:     return $found;
   51: }
   52: 
   53: sub handler {
   54:     my $r = shift;
   55:     my $reqhost = $r->get_remote_host(REMOTE_DOUBLE_REV);
   56:     if (!$reqhost && $r->get_remote_host(REMOTE_NOLOOKUP) eq $r->get_server_name()) { 
   57:         $reqhost = $r->get_server_name();
   58:     } 
   59:     unless ($reqhost) {
   60:        $r->log_reason("Spoof request from ".$ENV{'REMOTE_ADDR'});
   61:        return FORBIDDEN;
   62:     }
   63:     my $readline;
   64:     my $lontabdir=$r->dir_config('lonTabDir');
   65:     {
   66:        my $fh;
   67:        unless ($fh=Apache::File->new("$lontabdir/hosts.tab")) {
   68:           $r->log_reason("Could not find host tab file");
   69:           return FORBIDDEN;
   70:        }
   71:        my $return;
   72:        my @ids=();
   73:        while ($readline=<$fh>) {
   74:           my ($id,$domain,$role,$name,$ip)=split(/:/,$readline);
   75:           if ($name =~ /$reqhost/i) {
   76:               my $filename=$r->filename;
   77:               if ((-e "$filename.$id") ||
   78: 		  &subscribed($filename,$id) ||
   79: 		  ($filename=~/\.meta$/)) {
   80: 	         return OK;
   81:               } else {
   82:                  $return=FORBIDDEN;
   83: 		 push(@ids,$id);
   84:               }
   85:           }
   86:        }
   87:        if ($return == FORBIDDEN) {
   88: 	   $r->log_reason(join(':',@ids)." not subscribed", $r->filename);
   89: 	   return FORBIDDEN;
   90:        }
   91:     }
   92:     $r->log_reason("Invalid request for file transfer from $reqhost", 
   93:                    $r->filename); 
   94:     return FORBIDDEN;
   95: }
   96: 
   97: 1;
   98: __END__
   99: 
  100: =head1 NAME
  101: 
  102: Apache::lonracc - Access Handler for File Transfers
  103: 
  104: =head1 SYNOPSIS
  105: 
  106: Invoked by /etc/httpd/conf/loncapa.conf:
  107: 
  108:  <LocationMatch "^/raw.*">
  109:  PerlAccessHandler Apache::lonracc
  110:  </LocationMatch>
  111: 
  112: =head1 INTRODUCTION
  113: 
  114: This module enables authentication for file transfers and works
  115: against the /res tree.
  116: 
  117: Only lond invokes the /raw namespace through its subscribe function.
  118: 
  119: This is part of the LearningOnline Network with CAPA project
  120: described at http://www.lon-capa.org.
  121: 
  122: =head1 HANDLER SUBROUTINE
  123: 
  124: This routine is called by Apache and mod_perl.
  125: 
  126: =over 4
  127: 
  128: =item *
  129: 
  130: Determine requesting host
  131: 
  132: =item *
  133: 
  134: See whether or not the requesting host is subscribed.
  135: 
  136: =item *
  137: 
  138: Respond with status of request and make log entry in case of unallowed
  139: access.
  140: 
  141: =back
  142: 
  143: =cut
  144: 
  145: 
  146: 
  147: 
  148: 
  149: 
  150: