mirror of
https://github.com/hashcat/hashcat.git
synced 2024-12-23 15:18:16 +00:00
227 lines
6.3 KiB
Perl
227 lines
6.3 KiB
Perl
#!/usr/bin/env perl
|
|
|
|
##
|
|
## Author......: See docs/credits.txt
|
|
## License.....: MIT
|
|
##
|
|
|
|
use strict;
|
|
use warnings;
|
|
|
|
use Digest::SHA qw (hmac_sha1);
|
|
use Crypt::Mode::CBC;
|
|
use Crypt::PBKDF2;
|
|
use Encode;
|
|
use POSIX qw (strftime);
|
|
|
|
sub byte2hex
|
|
{
|
|
my $input = shift;
|
|
return unpack ("H*", $input);
|
|
}
|
|
|
|
sub hex2byte
|
|
{
|
|
my $input = shift;
|
|
return pack ("H*", $input);
|
|
}
|
|
|
|
sub pad
|
|
{
|
|
my $n = shift;
|
|
my $size = shift;
|
|
|
|
return (~$n + 1) & ($size - 1);
|
|
}
|
|
|
|
sub module_constraints { [[0, 256], [16, 16], [-1, -1], [-1, -1], [-1, -1]] }
|
|
|
|
sub module_generate_hash
|
|
{
|
|
my $word = shift;
|
|
my $salt = shift;
|
|
my $user = shift // "user";
|
|
my $realm = shift // "realm";
|
|
my $checksum = shift;
|
|
my $edata2 = shift;
|
|
|
|
my $mysalt = uc $realm;
|
|
$mysalt = $mysalt . $user;
|
|
|
|
# first we generate the 'seed'
|
|
my $iter = 4096;
|
|
my $pbkdf2 = Crypt::PBKDF2->new
|
|
(
|
|
hash_class => 'HMACSHA1',
|
|
iterations => $iter,
|
|
output_len => 32
|
|
);
|
|
|
|
my $b_seed = $pbkdf2->PBKDF2 ($mysalt, $word);
|
|
|
|
# we can precompute this
|
|
my $b_kerberos_nfolded = hex2byte ('6b65726265726f737b9b5b2b93132b93');
|
|
|
|
my $b_iv = hex2byte ('0' x 32);
|
|
|
|
# 'key_bytes' will be the AES key used to generate 'ki' (for final hmac-sha1)
|
|
# and 'ke' (AES key to decrypt/encrypt the ticket)
|
|
my $cbc = Crypt::Mode::CBC->new ('AES', 0);
|
|
my $b_key_bytes = $cbc->encrypt ($b_kerberos_nfolded, $b_seed, $b_iv);
|
|
|
|
$b_key_bytes = $b_key_bytes . $cbc->encrypt ($b_key_bytes, $b_seed, $b_iv);
|
|
|
|
# precomputed stuff
|
|
my $b_nfolded1 = hex2byte ('62dc6e371a63a80958ac562b15404ac5');
|
|
my $b_nfolded2 = hex2byte ('b5b0582c14b6500aad56ab55aa80556a');
|
|
|
|
my $b_ki = $cbc->encrypt ($b_nfolded1, $b_key_bytes, $b_iv);
|
|
|
|
$b_ki = $b_ki . $cbc->encrypt ($b_ki, $b_key_bytes, $b_iv);
|
|
|
|
my $b_ke = $cbc->encrypt ($b_nfolded2, $b_key_bytes, $b_iv);
|
|
|
|
$b_ke = $b_ke . $cbc->encrypt ($b_ke, $b_key_bytes, $b_iv);
|
|
|
|
my $cleartext_ticket = '6381b03081ada00703050050a00000a11b3019a003020117a1'.
|
|
'12041058e0d77776e8b8e03991f2966939222aa2171b154d594b5242544553542e434f4e5'.
|
|
'44f534f2e434f4da3133011a003020102a10a30081b067472616e6365a40b3009a0030201'.
|
|
'01a1020400a511180f32303136303231353134343735305aa611180f32303136303231353'.
|
|
'134343735305aa711180f32303136303231363030343735305aa811180f32303136303232'.
|
|
'323134343735305a';
|
|
|
|
if (defined $edata2)
|
|
{
|
|
my $len_last_block = length ($edata2) % 32;
|
|
|
|
my $tmp = $len_last_block + 32;
|
|
|
|
my $b_truncated_enc_ticket = hex2byte (substr $edata2, 0, -$tmp);
|
|
|
|
my $b_last_block = hex2byte (substr $edata2, -$len_last_block);
|
|
|
|
my $b_n_1_block = hex2byte (substr (substr ($edata2, -$tmp), 0, 32));
|
|
|
|
my $b_truncated_ticket_decrypted = $cbc->decrypt ($b_truncated_enc_ticket, $b_ke, $b_iv);
|
|
|
|
my $truncated_ticket_decrypted = byte2hex ($b_truncated_ticket_decrypted);
|
|
|
|
my $check_correct = ((substr ($truncated_ticket_decrypted, 32, 4) eq "6381" && substr ($truncated_ticket_decrypted, 38, 2) eq "30") ||
|
|
(substr ($truncated_ticket_decrypted, 32, 4) eq "6382")) &&
|
|
((substr ($truncated_ticket_decrypted, 48, 6) eq "030500") ||
|
|
(substr ($truncated_ticket_decrypted, 48, 8) eq "050307A0"));
|
|
|
|
if ($check_correct == 1)
|
|
{
|
|
my $b_n_2 = substr $b_truncated_enc_ticket, -16;
|
|
|
|
my $b_n_1_decrypted = $cbc->decrypt ($b_n_1_block, $b_ke, $b_iv);
|
|
|
|
my $b_last_plain = substr $b_n_1_decrypted, 0, $len_last_block / 2;
|
|
|
|
$b_last_plain = $b_last_plain ^ $b_last_block;
|
|
|
|
my $omitted = substr $b_n_1_decrypted, -(16 - $len_last_block / 2);
|
|
|
|
my $b_n_1 = $b_last_block . $omitted;
|
|
|
|
$b_n_1 = $cbc->decrypt ($b_n_1, $b_ke, $b_iv);
|
|
|
|
$b_n_1 = $b_n_1 ^ $b_n_2;
|
|
|
|
my $b_cleartext_ticket = $b_truncated_ticket_decrypted . $b_n_1 . $b_last_plain;
|
|
|
|
$cleartext_ticket = byte2hex ($b_cleartext_ticket);
|
|
}
|
|
else # validation failed
|
|
{
|
|
# fake/wrong ticket (otherwise if we just decrypt/encrypt we end
|
|
#up with false positives all the time)
|
|
$cleartext_ticket = "0" x (length ($cleartext_ticket) + 32);
|
|
}
|
|
}
|
|
|
|
if (defined $checksum)
|
|
{
|
|
$checksum = pack ("H*", $checksum);
|
|
}
|
|
else
|
|
{
|
|
if (!defined $edata2)
|
|
{
|
|
my $nonce = unpack ("H*", random_bytes (16));
|
|
|
|
$cleartext_ticket = $nonce . $cleartext_ticket;
|
|
}
|
|
# we have what is required to compute checksum
|
|
$checksum = hmac_sha1 (hex2byte ($cleartext_ticket), $b_ki);
|
|
|
|
$checksum = substr $checksum, 0, 12;
|
|
}
|
|
|
|
my $len_cleartext_last_block = length ($cleartext_ticket) % 32;
|
|
my $cleartext_last_block = substr $cleartext_ticket, -$len_cleartext_last_block;
|
|
|
|
my $padding = pad (length ($cleartext_ticket), 32);
|
|
|
|
my $b_cleartext_last_block_padded = hex2byte ($cleartext_last_block . '0' x $padding);
|
|
|
|
# we will encrypt until n-1 block (included)
|
|
my $truncated_cleartext_ticket = substr $cleartext_ticket, 0, -$len_cleartext_last_block;
|
|
|
|
my $b_truncated_enc_ticket = $cbc->encrypt (hex2byte ($truncated_cleartext_ticket), $b_ke, $b_iv);
|
|
|
|
my $b_enc_ticket_n_1_block= substr $b_truncated_enc_ticket, -16;
|
|
|
|
my $b_enc_last_block = substr $b_enc_ticket_n_1_block, 0, $len_cleartext_last_block / 2;
|
|
|
|
# we now craft the new n-1 block
|
|
my $tmp = $b_enc_ticket_n_1_block ^ $b_cleartext_last_block_padded;
|
|
|
|
$b_enc_ticket_n_1_block = $cbc->encrypt ($tmp, $b_ke, $b_iv);
|
|
|
|
$tmp = substr $b_truncated_enc_ticket, 0, -16;
|
|
|
|
$edata2 = $tmp . $b_enc_ticket_n_1_block . $b_enc_last_block;
|
|
|
|
my $tmp_hash = sprintf ('$krb5tgs$18$%s$%s$%s$%s', $user, $realm, unpack ("H*", $checksum), unpack ("H*", $edata2));
|
|
|
|
return $tmp_hash;
|
|
}
|
|
|
|
sub module_verify_hash
|
|
{
|
|
my $line = shift;
|
|
|
|
my ($hash, $word) = split (':', $line);
|
|
|
|
return unless defined $hash;
|
|
return unless defined $word;
|
|
|
|
my @data = split ('\$', $hash);
|
|
|
|
return unless scalar @data == 7;
|
|
|
|
shift @data;
|
|
|
|
my $signature = shift @data;
|
|
my $algorithm = shift @data;
|
|
my $user = shift @data;
|
|
my $realm = shift @data;
|
|
my $checksum = shift @data;
|
|
my $edata2 = shift @data;
|
|
|
|
return unless ($signature eq "krb5tgs");
|
|
return unless ($algorithm eq "18");
|
|
return unless (length ($checksum) == 24);
|
|
return unless (length ($edata2) >= 64);
|
|
|
|
my $word_packed = pack_if_HEX_notation ($word);
|
|
|
|
my $new_hash = module_generate_hash ($word_packed, undef, $user, $realm, $checksum, $edata2);
|
|
|
|
return ($new_hash, $word);
|
|
}
|
|
|
|
1;
|