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- performace enhancements (no need to do hostname lookups in the uploaded case or if the .subscription file doesn't exist or its a meta file)
- some style
- notice when gethostbyname fails and fail gracefully rather than ISE

    1: # The LearningOnline Network
    2: # Access Handler for File Transfers
    3: #
    4: # $Id: lonracc.pm,v 1.18 2007/02/01 06:20:34 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: 
   29: package Apache::lonracc;
   30: 
   31: use strict;
   32: use Apache::Constants qw(:common :remotehost);
   33: use Apache::lonnet;
   34: use Apache::File();
   35: use IO::Socket;
   36: 
   37: sub subscribed {
   38:     my ($filename,$id) = @_;
   39: 
   40:     return 0 if (-e "$filename.subscription");
   41: 
   42:     my $hostname=$Apache::lonnet::hostname{$id};
   43:     my (undef,undef,undef,undef,$ip) = gethostbyname($hostname);
   44:     
   45:     return 0 if (length($ip) != 4);
   46: 
   47:     $ip=inet_ntoa($ip);
   48: 
   49:     my $expr='^'.quotemeta($id).':'.quotemeta($ip).':';
   50: 
   51:     my $found=0;
   52:     if (my $sh=Apache::File->new("$filename.subscription")) {
   53: 	while (my $subline=<$sh>) { if ($subline =~ /$expr/) { $found=1; } }
   54: 	$sh->close();
   55:     }
   56:     return $found;
   57: }
   58: 
   59: sub handler {
   60:     my $r = shift;
   61:     my $reqhost = $r->get_remote_host(REMOTE_NOLOOKUP);
   62:     my %iphost=&Apache::lonnet::get_iphost();
   63:     my $hostids=$iphost{$reqhost};
   64:     if (!$hostids && $reqhost ne '127.0.0.1' ) {
   65: 	$r->log_reason("Unable to find a host for ".
   66: 		       $r->get_remote_host(REMOTE_NOLOOKUP));
   67: 	return FORBIDDEN;
   68:     }
   69:     if ($reqhost eq '127.0.0.1') {
   70: 	return OK;
   71:     }
   72:     my $return;
   73:     my @ids;
   74: 
   75:     foreach my $id (@{$hostids}) {
   76: 	my $filename=$r->filename;
   77: 	my $uri =$r->uri;
   78: 	if (($filename=~/\.meta$/) ||
   79: 	    ($uri=~m|^/raw/uploaded|) ||
   80: 	    (-e "$filename.$id") ||
   81: 	    &subscribed($filename,$id) ) {
   82: 	    return OK;
   83: 	} else {
   84: 	    $return=FORBIDDEN;
   85: 	    push(@ids,$id);
   86: 	}
   87:     }
   88:     if ($return == FORBIDDEN) {
   89: 	$r->log_reason(join(':',@ids)." not subscribed", $r->filename);
   90: 	return FORBIDDEN;
   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: