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Diff for /loncom/auth/lonracc.pm between versions 1.2 and 1.23

version 1.2, 2000/06/30 17:09:51 version 1.23, 2008/11/12 20:01:09
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 # The LearningOnline Network  # The LearningOnline Network
 # Access Handler for File Transfers  # Access Handler for File Transfers
 # (lonacc: Cookie Based Access Handler  #
 # 5/21/99,5/22,5/29,5/31,6/15 Gerd Kortemeyer)  # $Id$
 # 6/16,6/18,7/3,  #
 # 6/30/00 Gerd Kortemeyer  # Copyright Michigan State University Board of Trustees
   #
   # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   #
   # LON-CAPA is free software; you can redistribute it and/or modify
   # it under the terms of the GNU General Public License as published by
   # the Free Software Foundation; either version 2 of the License, or
   # (at your option) any later version.
   #
   # LON-CAPA is distributed in the hope that it will be useful,
   # but WITHOUT ANY WARRANTY; without even the implied warranty of
   # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   # GNU General Public License for more details.
   #
   # You should have received a copy of the GNU General Public License
   # along with LON-CAPA; if not, write to the Free Software
   # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   #
   # /home/httpd/html/adm/gpl.txt
   #
   # http://www.lon-capa.org/
   #
   
   =pod
   
   =head1 NAME
   
   Apache::lonracc - Access Handler for File Transfers
   
   =head1 SYNOPSIS
   
   Invoked by /etc/httpd/conf/loncapa.conf:
   
    <LocationMatch "^/raw.*">
    PerlAccessHandler Apache::lonracc
    </LocationMatch>
   
   =head1 INTRODUCTION
   
   This module enables authentication for file transfers and works
   against the /res tree.
   
   Only lond invokes the /raw namespace through its subscribe function.
   
   This is part of the LearningOnline Network with CAPA project
   described at http://www.lon-capa.org.
   
   =head1 HANDLER SUBROUTINE
   
   This routine is called by Apache and mod_perl.
   
   =over 4
   
   =item *
   
   Determine requesting host
   
   =item *
   
   See whether or not the requesting host is subscribed.
   
   =item *
   
   Respond with status of request and make log entry in case of unallowed
   access.
   
   =back
   
   =cut
   
 package Apache::lonracc;  package Apache::lonracc;
   
 use strict;  use strict;
 use Apache::Constants qw(:common :remotehost);  use Apache::Constants qw(:common :remotehost);
   use Apache::lonnet;
 use Apache::File();  use Apache::File();
   use IO::Socket;
   
   sub subscribed {
       my ($filename,$id) = @_;
   
       return 0 if (!-e "$filename.subscription");
   
       my $hostname=&Apache::lonnet::hostname($id);
       my (undef,undef,undef,undef,$ip) = gethostbyname($hostname);
       
       return 0 if (length($ip) != 4);
   
       $ip=inet_ntoa($ip);
   
       my $expr='^'.quotemeta($id).':'.quotemeta($ip).':';
   
       my $found=0;
       if (my $sh=Apache::File->new("$filename.subscription")) {
    while (my $subline=<$sh>) { if ($subline =~ /$expr/) { $found=1; } }
    $sh->close();
       }
       return $found;
   }
   
 sub handler {  sub handler {
     my $r = shift;      my $r = shift;
     my $reqhost;  
     unless ($reqhost=$r->get_remote_host(REMOTE_DOUBLE_REV)) {  
        $r->log_reason("Spoof request");  
        return FORBIDDEN;  
     }  
     my $readline;  
     my $lontabdir=$r->dir_config('lonTabDir');  
     {  
        my $fh;  
        unless ($fh=Apache::File->new("$lontabdir/hosts.tab")) {  
           $r->log_reason("Could not find host tab file");  
           return FORBIDDEN;  
        }  
        while ($readline=<$fh>) {  
           my ($id,$domain,$role,$name,$ip)=split(/:/,$readline);  
           if ($name =~ /$reqhost/i) {  
               my $filename=$r->filename;  
               if ((-e "$filename.$id") || ($filename=~/\.meta$/)) {  
          return OK;  
               } else {  
                  $r->log_reason("$id not subscribed", $r->filename);  
                  return FORBIDDEN;  
               }  
           }  
        }  
   
       my $filename=$r->filename;
       if (!-e $filename) {
    return NOT_FOUND;
       }
   
       my $reqhost = $r->get_remote_host(REMOTE_NOLOOKUP);
       my @hostids= &Apache::lonnet::get_hosts_from_ip($reqhost);
       if (!@hostids && $reqhost ne '127.0.0.1' ) {
    $r->log_reason("Unable to find a host for ".
          $r->get_remote_host(REMOTE_NOLOOKUP));
    return FORBIDDEN;
       }
       if ($reqhost eq '127.0.0.1') {
    return OK;
       }
       my $return;
       my @ids;
   
       foreach my $id (@hostids) {
    my $uri =$r->uri;
    if (($filename=~/\.meta$/) ||
       ($uri=~m|^/raw/uploaded|) ||
       (-e "$filename.$id") ||
       &subscribed($filename,$id) ) {
       return OK;
    } else {
       $return=FORBIDDEN;
       push(@ids,$id);
    }
       }
       if ($return == FORBIDDEN) {
    $r->log_reason(join(':',@ids)." not subscribed", $r->filename);
    return FORBIDDEN;
     }      }
     $r->log_reason("Invalid request for file transfer from $reqhost",       $r->log_reason("Invalid request for file transfer from $reqhost", 
                    $r->filename);                      $r->filename); 
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Removed from v.1.2  
changed lines
  Added in v.1.23

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