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Annotation of loncom/auth/lonracc.pm, revision 1.24

1.1       albertel    1: # The LearningOnline Network
                      2: # Access Handler for File Transfers
1.3       www         3: #
1.24    ! raeburn     4: # $Id: lonracc.pm,v 1.23 2008/11/12 20:01:09 jms Exp $
1.3       www         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: #
1.1       albertel   28: 
1.23      jms        29: =pod
                     30: 
                     31: =head1 NAME
                     32: 
                     33: Apache::lonracc - Access Handler for File Transfers
                     34: 
                     35: =head1 SYNOPSIS
                     36: 
                     37: Invoked by /etc/httpd/conf/loncapa.conf:
                     38: 
                     39:  <LocationMatch "^/raw.*">
                     40:  PerlAccessHandler Apache::lonracc
                     41:  </LocationMatch>
                     42: 
                     43: =head1 INTRODUCTION
                     44: 
                     45: This module enables authentication for file transfers and works
                     46: against the /res tree.
                     47: 
                     48: Only lond invokes the /raw namespace through its subscribe function.
                     49: 
                     50: This is part of the LearningOnline Network with CAPA project
                     51: described at http://www.lon-capa.org.
                     52: 
                     53: =head1 HANDLER SUBROUTINE
                     54: 
                     55: This routine is called by Apache and mod_perl.
                     56: 
                     57: =over 4
                     58: 
                     59: =item *
                     60: 
                     61: Determine requesting host
                     62: 
                     63: =item *
                     64: 
                     65: See whether or not the requesting host is subscribed.
                     66: 
                     67: =item *
                     68: 
                     69: Respond with status of request and make log entry in case of unallowed
                     70: access.
                     71: 
                     72: =back
                     73: 
                     74: =cut
                     75: 
1.1       albertel   76: package Apache::lonracc;
                     77: 
                     78: use strict;
                     79: use Apache::Constants qw(:common :remotehost);
1.17      albertel   80: use Apache::lonnet;
1.1       albertel   81: use Apache::File();
1.14      albertel   82: use IO::Socket;
1.1       albertel   83: 
1.5       albertel   84: sub subscribed {
                     85:     my ($filename,$id) = @_;
1.18      albertel   86: 
1.20      albertel   87:     return 0 if (!-e "$filename.subscription");
1.18      albertel   88: 
1.21      albertel   89:     my $hostname=&Apache::lonnet::hostname($id);
1.14      albertel   90:     my (undef,undef,undef,undef,$ip) = gethostbyname($hostname);
1.18      albertel   91:     
                     92:     return 0 if (length($ip) != 4);
                     93: 
1.14      albertel   94:     $ip=inet_ntoa($ip);
1.18      albertel   95: 
                     96:     my $expr='^'.quotemeta($id).':'.quotemeta($ip).':';
                     97: 
                     98:     my $found=0;
                     99:     if (my $sh=Apache::File->new("$filename.subscription")) {
1.5       albertel  100: 	while (my $subline=<$sh>) { if ($subline =~ /$expr/) { $found=1; } }
                    101: 	$sh->close();
                    102:     }
                    103:     return $found;
                    104: }
                    105: 
1.1       albertel  106: sub handler {
                    107:     my $r = shift;
1.19      albertel  108: 
                    109:     my $filename=$r->filename;
                    110:     if (!-e $filename) {
                    111: 	return NOT_FOUND;
                    112:     }
                    113: 
1.24    ! raeburn   114:     my $reqhost = &Apache::lonnet::get_requestor_ip($r,REMOTE_NOLOOKUP,1);
1.22      albertel  115:     my @hostids= &Apache::lonnet::get_hosts_from_ip($reqhost);
                    116:     if (!@hostids && $reqhost ne '127.0.0.1' ) {
1.16      albertel  117: 	$r->log_reason("Unable to find a host for ".
                    118: 		       $r->get_remote_host(REMOTE_NOLOOKUP));
1.15      albertel  119: 	return FORBIDDEN;
1.12      www       120:     }
1.16      albertel  121:     if ($reqhost eq '127.0.0.1') {
1.14      albertel  122: 	return OK;
1.1       albertel  123:     }
1.13      www       124:     my $return;
1.18      albertel  125:     my @ids;
1.16      albertel  126: 
1.22      albertel  127:     foreach my $id (@hostids) {
1.16      albertel  128: 	my $uri =$r->uri;
1.18      albertel  129: 	if (($filename=~/\.meta$/) ||
                    130: 	    ($uri=~m|^/raw/uploaded|) ||
                    131: 	    (-e "$filename.$id") ||
                    132: 	    &subscribed($filename,$id) ) {
1.16      albertel  133: 	    return OK;
                    134: 	} else {
                    135: 	    $return=FORBIDDEN;
                    136: 	    push(@ids,$id);
1.13      www       137: 	}
                    138:     }
                    139:     if ($return == FORBIDDEN) {
                    140: 	$r->log_reason(join(':',@ids)." not subscribed", $r->filename);
                    141: 	return FORBIDDEN;
1.1       albertel  142:     }
                    143:     $r->log_reason("Invalid request for file transfer from $reqhost", 
                    144:                    $r->filename); 
                    145:     return FORBIDDEN;
                    146: }
                    147: 
                    148: 1;
                    149: __END__
                    150: 
1.4       harris41  151: 
1.1       albertel  152: 
                    153: 
                    154: 
                    155: 
                    156: 
                    157: 
                    158: