# The LearningOnline Network
# Cookie Based Access Handler for Construction Area
# (lonacc: 5/21/99,5/22,5/29,5/31 Gerd Kortemeyer)
#
# $Id: loncacc.pm,v 1.22 2002/09/10 14:26:13 www 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/
#
# YEAR=2000
# 6/15,16/11,22/11,
# YEAR=2001
# 01/06,01/11,6/1,9/25,9/28,11/22,12/25,12/26,
# 01/06/01,05/04,05/05,05/09 Gerd Kortemeyer
# 12/21 Scott Harrison
# YEAR=2002
# 1/4 Gerd Kortemeyer
###
package Apache::loncacc;
use strict;
use Apache::Constants qw(:common :http :methods);
use Apache::File;
use CGI::Cookie();
use Fcntl qw(:flock);
sub constructaccess {
my ($url,$ownerdomain)=@_;
my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)(\w+)/);
unless (($ownername) && ($ownerdomain)) { return ''; }
if (($ownername eq $ENV{'user.name'}) &&
($ownerdomain eq $ENV{'user.domain'})) {
return ($ownername,$ownerdomain);
}
my $capriv='user.priv.ca./'.
$ownerdomain.'/'.$ownername.'./'.
$ownerdomain.'/'.$ownername;
foreach (keys %ENV) {
if ($_ eq $capriv) {
return ($ownername,$ownerdomain);
}
}
return '';
}
sub handler {
my $r = shift;
my $requrl=$r->uri;
$ENV{'request.editurl'}=$requrl;
my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
my $lonid=$cookies{'lonID'};
my $cookie;
if ($lonid) {
my $handle=$lonid->value;
$handle=~s/\W//g;
my $lonidsdir=$r->dir_config('lonIDsDir');
if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
my @profile;
{
my $idf=Apache::File->new("$lonidsdir/$handle.id");
flock($idf,LOCK_SH);
@profile=<$idf>;
$idf->close();
}
my $envi;
for ($envi=0;$envi<=$#profile;$envi++) {
chomp($profile[$envi]);
my ($envname,$envvalue)=split(/=/,$profile[$envi]);
$ENV{$envname} = $envvalue;
}
$ENV{'user.environment'} = "$lonidsdir/$handle.id";
$ENV{'request.state'} = "construct";
$ENV{'request.filename'} = $r->filename;
unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) {
$r->log_reason("Unauthorized $requrl", $r->filename);
return HTTP_NOT_ACCEPTABLE;
}
# -------------------------------------------------------- Load POST parameters
my $buffer;
$r->read($buffer,$r->header_in('Content-length'));
unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
my @pairs=split(/&/,$buffer);
my $pair;
foreach $pair (@pairs) {
my ($name,$value) = split(/=/,$pair);
$value =~ tr/+/ /;
$value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
$name =~ tr/+/ /;
$name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
&Apache::loncommon::add_to_env("form.$name",$value);
}
} else {
my $contentsep=$1;
my @lines = split (/\n/,$buffer);
my $name='';
my $value='';
my $fname='';
my $fmime='';
my $i;
for ($i=0;$i<=$#lines;$i++) {
if ($lines[$i]=~/^$contentsep/) {
if ($name) {
chomp($value);
if ($fname) {
$ENV{"form.$name.filename"}=$fname;
$ENV{"form.$name.mimetype"}=$fmime;
} else {
$value=~s/\s+$//s;
}
&Apache::loncommon::add_to_env("form.$name",$value);
}
if ($i<$#lines) {
$i++;
$lines[$i]=~
/Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
$name=$1;
$value='';
if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
$fname=$1;
if
($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
$fmime=$1;
$i++;
} else {
$fmime='';
}
} else {
$fname='';
$fmime='';
}
$i++;
}
} else {
$value.=$lines[$i]."\n";
}
}
}
$ENV{'request.method'}=$ENV{'REQUEST_METHOD'};
$r->method_number(M_GET);
$r->method('GET');
$r->headers_in->unset('Content-length');
return OK;
} else {
$r->log_reason("Cookie $handle not valid", $r->filename)
};
}
# ----------------------------------------------- Store where they wanted to go
$ENV{'request.firsturl'}=$requrl;
return FORBIDDEN;
}
1;
__END__
=head1 NAME
Apache::lonacc - Cookie Based Access Handler for Construction Area
=head1 SYNOPSIS
Invoked (for various locations) by /etc/httpd/conf/srm.conf:
PerlAccessHandler Apache::loncacc
=head1 INTRODUCTION
This module enables cookie based authentication for construction area
and is used to control access for three (essentially equivalent) URIs.
<LocationMatch "^/priv.*">
<LocationMatch "^/\~.*">
<LocationMatch "^/\~.*/$">
Whenever the client sends the cookie back to the server,
if the cookie is missing or invalid, the user is re-challenged
for login information.
This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.
=head1 HANDLER SUBROUTINE
This routine is called by Apache and mod_perl.
=over 4
=item *
load POST parameters
=item *
store where they wanted to go (first url entered)
=back
=head1 OTHERSUBROUTINES
=over 4
=item *
constructaccess($url,$ownerdomain) : See if the owner domain and name
in the URL match those in the expected environment. If so, return
two element list ($ownername,$ownerdomain). Else, return null string.
=back
=cut
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