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Annotation of loncom/auth/lonracc.pm, revision 1.23

1.1       albertel    1: # The LearningOnline Network
                      2: # Access Handler for File Transfers
1.3       www         3: #
1.23    ! jms         4: # $Id: lonracc.pm,v 1.22 2007/03/02 23:43:29 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: 
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: 
1.15      albertel  114:     my $reqhost = $r->get_remote_host(REMOTE_NOLOOKUP);
1.22      albertel  115:     my @hostids= &Apache::lonnet::get_hosts_from_ip($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: 
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