1: # The LearningOnline Network
2: # URL translation for encrypted filenames
3: #
4: # $Id: lonenc.pm,v 1.1 2004/03/31 04:38:06 www Exp $
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: #
28:
29: package Apache::lonenc;
30:
31: use strict;
32: use Apache::Constants qw(:common :remotehost);
33: use Apache::lonnet();
34: use Apache::File();
35: use Apache::loncommon;
36: use Crypt::IDEA;
37:
38: sub handler {
39: my $r = shift;
40: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
41: my $lonid=$cookies{'lonID'};
42: my $cookie;
43: if ($lonid) {
44: my $handle=$lonid->value;
45: $handle=~s/\W//g;
46: my $lonidsdir=$r->dir_config('lonIDsDir');
47: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
48: # Initialize Environment
49: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
50: # Decrypt URL and redirect
51: $r->internal_redirect(&unencrypted($r->uri));
52: return OK;
53: }
54: }
55: return FORBIDDEN;
56: }
57:
58: sub unencrypted {
59: my $uri=shift;
60: $uri=~s/^\/enc\/(\d+)\///;
61: &Apache::lonnet::logthis($uri);
62: my $cmdlength=$1;
63: unless ($ENV{'course.'.$ENV{'request.course.id'}.'.internal.encseed'}) {
64: return '/'.$uri;
65: }
66: $uri=&Apache::lonnet::unescape($uri);
67: my $cipher=
68: new IDEA $ENV{'course.'.$ENV{'request.course.id'}.'.internal.encseed'};
69: &Apache::lonnet::logthis($ENV{'course.'.$ENV{'request.course.id'}.'.internal.encseed'});
70: my $decuri='';
71: for (my $encidx=0;$encidx<length($uri);$encidx+=16) {
72: $decuri.=$cipher->decrypt(
73: pack("H16",substr($uri,$encidx,16))
74: );
75: }
76: return substr($decuri,0,$cmdlength);
77: }
78:
79: sub encrypted {
80: my $uri=shift;
81: my $cmdlength=length($uri);
82: my $encuri='';
83: my $cipher=
84: new IDEA $ENV{'course.'.$ENV{'request.course.id'}.'.internal.encseed'};
85: for (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
86: $encuri.=unpack("H16",
87: $cipher->encrypt(substr($uri,$encidx,8)));
88: }
89: return '/enc/'.$cmdlength.'/'.&Apache::lonnet::escape($encuri);
90: }
91:
92: 1;
93: __END__
94:
95:
96:
97:
98:
99:
100:
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