--- loncom/auth/lonracc.pm 1999/10/13 17:48:52 1.1.1.1 +++ loncom/auth/lonracc.pm 2020/12/18 15:23:03 1.24 @@ -1,43 +1,144 @@ # The LearningOnline Network # Access Handler for File Transfers -# (lonacc: Cookie Based Access Handler -# 5/21/99,5/22,5/29,5/31,6/15 Gerd Kortemeyer) -# 6/16,6/18,7/3 Gerd Kortemeyer +# +# $Id: lonracc.pm,v 1.24 2020/12/18 15:23:03 raeburn Exp $ +# +# 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: + + + PerlAccessHandler Apache::lonracc + + +=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; use strict; use Apache::Constants qw(:common :remotehost); +use Apache::lonnet; 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 { 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") { - return OK; - } else { - $r->log_reason("$id not subscribed", $r->filename); - return FORBIDDEN; - } - } - } + my $filename=$r->filename; + if (!-e $filename) { + return NOT_FOUND; + } + + my $reqhost = &Apache::lonnet::get_requestor_ip($r,REMOTE_NOLOOKUP,1); + 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->filename); @@ -49,6 +150,7 @@ __END__ +