Commit | Line | Data |
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059ec3d9 PH |
1 | #!/usr/bin/perl |
2 | # $Cambridge: exim/src/util/cramtest.pl,v 1.1 2004/10/07 10:39:03 ph10 Exp $ | |
3 | ||
4 | # This script is contributed by Vadim Vygonets to aid in debugging CRAM-MD5 | |
5 | # authentication. | |
6 | ||
7 | # A patch was contributed by Jon Warbrick to upgrade it to use the Digest::MD5 | |
8 | # module instead of the deprecated MD5 module. | |
9 | ||
10 | # The script prompts for three data values: a user name, a password, and the | |
11 | # challenge as sent out by an SMTP server. The challenge is a base-64 string. | |
12 | # It should be copied (cut-and-pasted) literally as the third data item. The | |
13 | # output of the program is the base-64 string that is to be returned as the | |
14 | # response to the challenge. Using the example in RFC 2195: | |
15 | # | |
16 | # User: tim | |
17 | # Password: tanstaaftanstaaf | |
18 | # Challenge: PDE4OTYuNjk3MTcwOTUyQHBvc3RvZmZpY2UucmVzdG9uLm1jaS5uZXQ+ | |
19 | # dGltIGI5MTNhNjAyYzdlZGE3YTQ5NWI0ZTZlNzMzNGQzODkw | |
20 | # | |
21 | # The last line is what you you would send back to the server. | |
22 | ||
23 | ||
24 | # Copyright (c) 2002 | |
25 | # Vadim Vygonets <vadik-exim@vygo.net>. All rights reserved. | |
26 | # Public domain is OK with me. | |
27 | ||
28 | use MIME::Base64; | |
29 | use DIGEST::MD5; | |
30 | ||
31 | print "User: "; | |
32 | chop($user = <>); | |
33 | print "Password: "; | |
34 | chop($passwd = <>); | |
35 | print "Challenge: "; | |
36 | chop($chal = <>); | |
37 | $chal =~ s/^334 //; | |
38 | ||
39 | $context = new Digest::MD5; | |
40 | if (length($passwd) > 64) { | |
41 | $context->add($passwd); | |
42 | $passwd = $context->digest(); | |
43 | $context->reset(); | |
44 | } | |
45 | ||
46 | @passwd = unpack("C*", pack("a64", $passwd)); | |
47 | for ($i = 0; $i < 64; $i++) { | |
48 | $pass_ipad[$i] = $passwd[$i] ^ 0x36; | |
49 | $pass_opad[$i] = $passwd[$i] ^ 0x5C; | |
50 | } | |
51 | $context->add(pack("C64", @pass_ipad), decode_base64($chal)); | |
52 | $digest = $context->digest(); | |
53 | $context->reset(); | |
54 | $context->add(pack("C64", @pass_opad), $digest); | |
55 | $digest = $context->digest(); | |
56 | ||
57 | print encode_base64($user . " " . unpack("H*", $digest)); | |
58 | ||
59 | # End |