Annotation of loncom/lonenc.pm, revision 1.2
1.1 www 1: # The LearningOnline Network
2: # URL translation for encrypted filenames
3: #
1.2 ! www 4: # $Id: lonenc.pm,v 1.1 2004/03/31 04:38:06 www Exp $
1.1 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: #
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:
1.2 ! www 58: sub encryptseed {
! 59: my $seed=$ENV{'course.'.$ENV{'request.course.id'}.'.internal.encseed'};
! 60: $seed=~s/[^0-9a-f]/0/g;
! 61: $seed.='0123456789abcdef';
! 62: $seed=substr($seed.$seed,0,32);
! 63: return pack("H32",$seed);
! 64: }
! 65:
1.1 www 66: sub unencrypted {
67: my $uri=shift;
68: $uri=~s/^\/enc\/(\d+)\///;
69: my $cmdlength=$1;
1.2 ! www 70: my $seed=&encryptseed();
! 71: unless ($seed) {
1.1 www 72: return '/'.$uri;
73: }
74: $uri=&Apache::lonnet::unescape($uri);
1.2 ! www 75: my $cipher=new IDEA $seed;
1.1 www 76: my $decuri='';
77: for (my $encidx=0;$encidx<length($uri);$encidx+=16) {
78: $decuri.=$cipher->decrypt(
79: pack("H16",substr($uri,$encidx,16))
80: );
81: }
82: return substr($decuri,0,$cmdlength);
83: }
84:
85: sub encrypted {
86: my $uri=shift;
1.2 ! www 87: my $seed=&encryptseed();
! 88: unless ($seed) {
! 89: return $uri;
! 90: }
1.1 www 91: my $cmdlength=length($uri);
1.2 ! www 92: $uri.='00000000';
1.1 www 93: my $encuri='';
1.2 ! www 94: my $cipher=new IDEA $seed;
1.1 www 95: for (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
96: $encuri.=unpack("H16",
97: $cipher->encrypt(substr($uri,$encidx,8)));
98: }
99: return '/enc/'.$cmdlength.'/'.&Apache::lonnet::escape($encuri);
100: }
101:
102: 1;
103: __END__
104:
105:
106:
107:
108:
109:
110:
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