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Annotation of loncom/auth/lonracc.pm, revision 1.22

1.1       albertel    1: # The LearningOnline Network
                      2: # Access Handler for File Transfers
1.3       www         3: #
1.22    ! albertel    4: # $Id: lonracc.pm,v 1.21 2007/03/02 23:17:48 albertel 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: 
                     29: package Apache::lonracc;
                     30: 
                     31: use strict;
                     32: use Apache::Constants qw(:common :remotehost);
1.17      albertel   33: use Apache::lonnet;
1.1       albertel   34: use Apache::File();
1.14      albertel   35: use IO::Socket;
1.1       albertel   36: 
1.5       albertel   37: sub subscribed {
                     38:     my ($filename,$id) = @_;
1.18      albertel   39: 
1.20      albertel   40:     return 0 if (!-e "$filename.subscription");
1.18      albertel   41: 
1.21      albertel   42:     my $hostname=&Apache::lonnet::hostname($id);
1.14      albertel   43:     my (undef,undef,undef,undef,$ip) = gethostbyname($hostname);
1.18      albertel   44:     
                     45:     return 0 if (length($ip) != 4);
                     46: 
1.14      albertel   47:     $ip=inet_ntoa($ip);
1.18      albertel   48: 
                     49:     my $expr='^'.quotemeta($id).':'.quotemeta($ip).':';
                     50: 
                     51:     my $found=0;
                     52:     if (my $sh=Apache::File->new("$filename.subscription")) {
1.5       albertel   53: 	while (my $subline=<$sh>) { if ($subline =~ /$expr/) { $found=1; } }
                     54: 	$sh->close();
                     55:     }
                     56:     return $found;
                     57: }
                     58: 
1.1       albertel   59: sub handler {
                     60:     my $r = shift;
1.19      albertel   61: 
                     62:     my $filename=$r->filename;
                     63:     if (!-e $filename) {
                     64: 	return NOT_FOUND;
                     65:     }
                     66: 
1.15      albertel   67:     my $reqhost = $r->get_remote_host(REMOTE_NOLOOKUP);
1.22    ! albertel   68:     my @hostids= &Apache::lonnet::get_hosts_from_ip($reqhost);
        !            69:     if (!@hostids && $reqhost ne '127.0.0.1' ) {
1.16      albertel   70: 	$r->log_reason("Unable to find a host for ".
                     71: 		       $r->get_remote_host(REMOTE_NOLOOKUP));
1.15      albertel   72: 	return FORBIDDEN;
1.12      www        73:     }
1.16      albertel   74:     if ($reqhost eq '127.0.0.1') {
1.14      albertel   75: 	return OK;
1.1       albertel   76:     }
1.13      www        77:     my $return;
1.18      albertel   78:     my @ids;
1.16      albertel   79: 
1.22    ! albertel   80:     foreach my $id (@hostids) {
1.16      albertel   81: 	my $uri =$r->uri;
1.18      albertel   82: 	if (($filename=~/\.meta$/) ||
                     83: 	    ($uri=~m|^/raw/uploaded|) ||
                     84: 	    (-e "$filename.$id") ||
                     85: 	    &subscribed($filename,$id) ) {
1.16      albertel   86: 	    return OK;
                     87: 	} else {
                     88: 	    $return=FORBIDDEN;
                     89: 	    push(@ids,$id);
1.13      www        90: 	}
                     91:     }
                     92:     if ($return == FORBIDDEN) {
                     93: 	$r->log_reason(join(':',@ids)." not subscribed", $r->filename);
                     94: 	return FORBIDDEN;
1.1       albertel   95:     }
                     96:     $r->log_reason("Invalid request for file transfer from $reqhost", 
                     97:                    $r->filename); 
                     98:     return FORBIDDEN;
                     99: }
                    100: 
                    101: 1;
                    102: __END__
                    103: 
1.4       harris41  104: =head1 NAME
                    105: 
                    106: Apache::lonracc - Access Handler for File Transfers
                    107: 
                    108: =head1 SYNOPSIS
                    109: 
                    110: Invoked by /etc/httpd/conf/loncapa.conf:
                    111: 
                    112:  <LocationMatch "^/raw.*">
                    113:  PerlAccessHandler Apache::lonracc
                    114:  </LocationMatch>
                    115: 
                    116: =head1 INTRODUCTION
                    117: 
                    118: This module enables authentication for file transfers and works
                    119: against the /res tree.
                    120: 
                    121: Only lond invokes the /raw namespace through its subscribe function.
                    122: 
                    123: This is part of the LearningOnline Network with CAPA project
                    124: described at http://www.lon-capa.org.
                    125: 
                    126: =head1 HANDLER SUBROUTINE
                    127: 
                    128: This routine is called by Apache and mod_perl.
                    129: 
                    130: =over 4
                    131: 
                    132: =item *
                    133: 
                    134: Determine requesting host
                    135: 
                    136: =item *
                    137: 
                    138: See whether or not the requesting host is subscribed.
                    139: 
                    140: =item *
                    141: 
                    142: Respond with status of request and make log entry in case of unallowed
                    143: access.
                    144: 
                    145: =back
                    146: 
                    147: =cut
1.1       albertel  148: 
                    149: 
                    150: 
                    151: 
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                    154: