# 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 1.52 2011/02/24 23:42:18 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::lonacc - Cookie Based Access Handler for Construction Area
=head1 SYNOPSIS
Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.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 "^/\~.*/$">
Whenever the client sends the cookie back to the server,
if the cookie is missing or invalid, the user is re-challenged
for login information.
This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.
=head1 HANDLER SUBROUTINE
This routine is called by Apache and mod_perl.
=over 4
=item *
load POST parameters
=item *
store where they wanted to go (first url entered)
=back
=head1 OTHERSUBROUTINES
=over
=item constructaccess($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,$ownerdomain). Else, return null string.
=back
=cut
package Apache::loncacc;
use strict;
use Apache::Constants qw(:common :http :methods REDIRECT);
use Fcntl qw(:flock);
use Apache::lonlocal;
use Apache::lonnet;
use Apache::lonacc;
use LONCAPA qw(:DEFAULT :match);
sub constructaccess {
my ($url,$ownerdomain,$setpriv)=@_;
my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)($match_username)\//);
unless (($ownername) && ($ownerdomain)) { return ''; }
# We do not allow editing of previous versions of files.
if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }
my @possibledomains = &Apache::lonnet::current_machine_domains();
if ($ownername eq $env{'user.name'}) {
foreach my $domain (@possibledomains) {
if ($domain eq $env{'user.domain'}) {
return ($ownername,$domain);
}
}
}
foreach my $domain (@possibledomains) {
if (exists($env{'user.priv.ca./'.$domain.'/'.$ownername.'./'}) ||
exists($env{'user.priv.aa./'.$domain.'/'.$ownername.'./'}) ) {
return ($ownername,$domain);
}
}
my $then=$env{'user.login.time'};
my $update==$env{'user.updateroles.time'};
if (!$update) {
$update = $then;
}
my %dcroles = ();
if (&is_active_dc($ownerdomain,$update)) {
my %blocked=&Apache::lonnet::get('environment',['domcoord.author'],
$ownerdomain,$ownername);
unless ($blocked{'domcoord.author'} eq 'blocked') {
if (grep(/^$ownerdomain$/,@possibledomains)) {
if ($setpriv) {
my $refresh=$env{'user.refresh.time'};
if (!$refresh) {
$refresh = $update;
}
my $now = time;
&Apache::lonnet::check_adhoc_privs($ownerdomain,$ownername,
$update,$refresh,$now,'ca',
'constructaccess');
}
return($ownername,$ownerdomain);
}
}
}
return '';
}
sub is_active_dc {
my ($ownerdomain,$update) = @_;
my $livedc;
if ($env{'user.adv'}) {
my $domrole = $env{'user.role.dc./'.$ownerdomain.'/'};
if ($domrole) {
my ($tstart,$tend)=split(/\./,$domrole);
$livedc = 1;
if ($tstart && $tstart>$update) { undef($livedc); }
if ($tend && $tend <$update) { undef($livedc); }
}
}
return $livedc;
}
sub handler {
my $r = shift;
my $requrl=$r->uri;
$env{'request.editurl'}=$requrl;
my $handle = &Apache::lonnet::check_for_valid_session($r);
if ($handle ne '') {
# ------------------------------------------------------ Initialize Environment
my $lonidsdir=$r->dir_config('lonIDsDir');
&Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
# --------------------------------------------------------- Initialize Language
&Apache::lonlocal::get_language_handle($r);
# -------------------------------------------------------------- Resource State
$env{'request.state'} = "construct";
$env{'request.filename'} = $r->filename;
unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'),'setpriv')) {
$r->log_reason("Unauthorized $requrl", $r->filename);
return HTTP_NOT_ACCEPTABLE;
}
# -------------------------------------------------------- Load POST parameters
&Apache::lonacc::get_posted_cgi($r);
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__
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