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Copying lines from lontokacc.pm to make DOCS-style courses work on
standalone machines again.

    1: # The LearningOnline Network
    2: # Access Handler for File Transfers
    3: #
    4: # $Id: lonracc.pm,v 1.12 2004/04/26 00:07:29 www 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: 
   29: package Apache::lonracc;
   30: 
   31: use strict;
   32: use Apache::Constants qw(:common :remotehost);
   33: use Apache::lonnet();
   34: use Apache::File();
   35: 
   36: sub subscribed {
   37:     my ($filename,$id) = @_;
   38:     my $found=0;
   39:     my $expr='^'.$id.':'.$Apache::lonnet::hostip{$id}.':';
   40:     $expr =~ s/\./\\\./g;
   41:     my $sh;
   42:     if ($sh=Apache::File->new("$filename.subscription")) {
   43: 	while (my $subline=<$sh>) { if ($subline =~ /$expr/) { $found=1; } }
   44: 	$sh->close();
   45:     }
   46:     return $found;
   47: }
   48: 
   49: sub handler {
   50:     my $r = shift;
   51:     my $reqhost = $r->get_remote_host(REMOTE_DOUBLE_REV);
   52:     if (!$reqhost && $r->get_remote_host(REMOTE_NOLOOKUP) eq $r->get_server_name()) { 
   53:         $reqhost = $r->get_server_name();
   54:     } 
   55:     unless ($reqhost) {
   56:        $r->log_reason("Spoof request from ".$ENV{'REMOTE_ADDR'});
   57:        return FORBIDDEN;
   58:     }
   59:     if ($reqhost eq 'localhost.localdomain') {
   60:        return OK;
   61:     }
   62:     my $readline;
   63:     my $lontabdir=$r->dir_config('lonTabDir');
   64:     {
   65:        my $fh;
   66:        unless ($fh=Apache::File->new("$lontabdir/hosts.tab")) {
   67:           $r->log_reason("Could not find host tab file");
   68:           return FORBIDDEN;
   69:        }
   70:        my $return;
   71:        my @ids=();
   72:        while ($readline=<$fh>) {
   73:           my ($id,$domain,$role,$name,$ip)=split(/:/,$readline);
   74:           if ($name =~ /$reqhost/i) {
   75:               my $filename=$r->filename;
   76:               my $uri =$r->uri;
   77:               if ((-e "$filename.$id") ||
   78: 		  &subscribed($filename,$id) ||
   79: 		  ($filename=~/\.meta$/) ||
   80:                   ($uri=~m|^/raw/uploaded|)) {
   81: 	         return OK;
   82:               } else {
   83:                  $return=FORBIDDEN;
   84: 		 push(@ids,$id);
   85:               }
   86:           }
   87:        }
   88:        if ($return == FORBIDDEN) {
   89: 	   $r->log_reason(join(':',@ids)." not subscribed", $r->filename);
   90: 	   return FORBIDDEN;
   91:        }
   92:     }
   93:     $r->log_reason("Invalid request for file transfer from $reqhost", 
   94:                    $r->filename); 
   95:     return FORBIDDEN;
   96: }
   97: 
   98: 1;
   99: __END__
  100: 
  101: =head1 NAME
  102: 
  103: Apache::lonracc - Access Handler for File Transfers
  104: 
  105: =head1 SYNOPSIS
  106: 
  107: Invoked by /etc/httpd/conf/loncapa.conf:
  108: 
  109:  <LocationMatch "^/raw.*">
  110:  PerlAccessHandler Apache::lonracc
  111:  </LocationMatch>
  112: 
  113: =head1 INTRODUCTION
  114: 
  115: This module enables authentication for file transfers and works
  116: against the /res tree.
  117: 
  118: Only lond invokes the /raw namespace through its subscribe function.
  119: 
  120: This is part of the LearningOnline Network with CAPA project
  121: described at http://www.lon-capa.org.
  122: 
  123: =head1 HANDLER SUBROUTINE
  124: 
  125: This routine is called by Apache and mod_perl.
  126: 
  127: =over 4
  128: 
  129: =item *
  130: 
  131: Determine requesting host
  132: 
  133: =item *
  134: 
  135: See whether or not the requesting host is subscribed.
  136: 
  137: =item *
  138: 
  139: Respond with status of request and make log entry in case of unallowed
  140: access.
  141: 
  142: =back
  143: 
  144: =cut
  145: 
  146: 
  147: 
  148: 
  149: 
  150: 
  151: