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218 lines
6.3 KiB
Perl
218 lines
6.3 KiB
Perl
#!/usr/bin/env perl
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##
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## Author......: See docs/credits.txt
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## License.....: MIT
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##
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use strict;
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use warnings;
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use Digest::SHA qw (hmac_sha1);
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use Crypt::Mode::CBC;
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use Crypt::PBKDF2;
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sub byte2hex
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{
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my $input = shift;
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return unpack ("H*", $input);
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}
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sub hex2byte
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{
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my $input = shift;
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return pack ("H*", $input);
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}
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sub pad
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{
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my $n = shift;
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my $size = shift;
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return (~$n + 1) & ($size - 1);
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}
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sub module_constraints { [[0, 256], [16, 16], [-1, -1], [-1, -1], [-1, -1]] }
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sub module_generate_hash
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{
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my $word = shift;
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my $salt = shift;
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my $user = shift // "user";
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my $realm = shift // "example.com";
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my $checksum = shift;
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my $edata2 = shift;
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my $mysalt = uc $realm;
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$mysalt = $mysalt . $user;
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# first we generate the 'seed'
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my $iter = 4096;
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my $pbkdf2 = Crypt::PBKDF2->new
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(
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hash_class => 'HMACSHA1',
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iterations => $iter,
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output_len => 16
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);
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my $b_seed = $pbkdf2->PBKDF2 ($mysalt, $word);
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# we can precompute this
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my $b_kerberos_nfolded = hex2byte ('6b65726265726f737b9b5b2b93132b93');
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my $b_iv = hex2byte ('0' x 32);
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# 'key_bytes' will be the AES key used to generate 'ki' (for final hmac-sha1)
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# and 'ke' (AES key to decrypt/encrypt the ticket)
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my $cbc = Crypt::Mode::CBC->new ('AES', 0);
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my $b_key_bytes = $cbc->encrypt ($b_kerberos_nfolded, $b_seed, $b_iv);
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# precomputed stuff
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my $b_nfolded1 = hex2byte ('6b60b0582a6ba80d5aad56ab55406ad5');
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my $b_nfolded2 = hex2byte ('be349a4d24be500eaf57abd5ea80757a');
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my $b_ki = $cbc->encrypt ($b_nfolded1, $b_key_bytes, $b_iv);
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my $b_ke = $cbc->encrypt ($b_nfolded2, $b_key_bytes, $b_iv);
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my $cleartext_ticket = '7981df3081dca01b3019a003020111a1120410e2aa1c894df7'.
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'23b7277eef29700bf760a11c301a3018a003020100a111180f32303233303333313132303'.
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'434355aa20602041d9d970ba311180f32303337303931343032343830355aa40703050040'.
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'c10000a511180f32303233303333313132303434355aa611180f323032333033333131323'.
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'03434355aa711180f32303233303333313232303434355aa811180f323032333034303731'.
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'32303434355aa90d1b0b4558414d504c452e434f4daa20301ea003020102a11730151b066'.
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'b72627467741b0b6578616d706c652e636f6d';
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if (defined $edata2)
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{
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my $len_last_block = length ($edata2) % 32;
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my $tmp = $len_last_block + 32;
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my $b_truncated_enc_ticket = hex2byte (substr $edata2, 0, -$tmp);
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my $b_last_block = hex2byte (substr $edata2, -$len_last_block);
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my $b_n_1_block = hex2byte (substr (substr ($edata2, -$tmp), 0, 32));
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my $b_truncated_ticket_decrypted = $cbc->decrypt ($b_truncated_enc_ticket, $b_ke, $b_iv);
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my $truncated_ticket_decrypted = byte2hex ($b_truncated_ticket_decrypted);
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my $check_correct = ((substr ($truncated_ticket_decrypted, 16, 4) eq "7981" || substr ($truncated_ticket_decrypted, 16, 4) eq "7a81") && (substr ($truncated_ticket_decrypted, 22, 2) eq "30")) ||
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((substr ($truncated_ticket_decrypted, 16, 2) eq "79" || substr ($truncated_ticket_decrypted, 16, 2) eq "7a") && (substr ($truncated_ticket_decrypted, 20, 2) eq "30")) ||
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((substr ($truncated_ticket_decrypted, 16, 4) eq "7982" || substr ($truncated_ticket_decrypted, 16, 4) eq "7a82") && (substr ($truncated_ticket_decrypted, 24, 2) eq "30"));
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if ($check_correct == 1)
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{
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my $b_n_2 = substr $b_truncated_enc_ticket, -16;
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my $b_n_1_decrypted = $cbc->decrypt ($b_n_1_block, $b_ke, $b_iv);
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my $b_last_plain = substr $b_n_1_decrypted, 0, $len_last_block / 2;
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$b_last_plain = $b_last_plain ^ $b_last_block;
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my $omitted = substr $b_n_1_decrypted, -(16 - $len_last_block / 2);
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my $b_n_1 = $b_last_block . $omitted;
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$b_n_1 = $cbc->decrypt ($b_n_1, $b_ke, $b_iv);
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$b_n_1 = $b_n_1 ^ $b_n_2;
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my $b_cleartext_ticket = $b_truncated_ticket_decrypted . $b_n_1 . $b_last_plain;
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$cleartext_ticket = byte2hex ($b_cleartext_ticket);
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}
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else # validation failed
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{
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# fake/wrong ticket (otherwise if we just decrypt/encrypt we end
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#up with false positives all the time)
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$cleartext_ticket = "0" x (length ($cleartext_ticket) + 32);
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}
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}
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if (defined $checksum)
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{
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$checksum = pack ("H*", $checksum);
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}
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else
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{
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if (!defined $edata2)
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{
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my $nonce = unpack ("H*", random_bytes (16));
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$cleartext_ticket = $nonce . $cleartext_ticket;
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}
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# we have what is required to compute checksum
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$checksum = hmac_sha1 (hex2byte ($cleartext_ticket), $b_ki);
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$checksum = substr $checksum, 0, 12;
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}
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my $len_cleartext_last_block = length ($cleartext_ticket) % 32;
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my $cleartext_last_block = substr $cleartext_ticket, -$len_cleartext_last_block;
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my $padding = pad (length ($cleartext_ticket), 32);
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my $b_cleartext_last_block_padded = hex2byte ($cleartext_last_block . '0' x $padding);
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# we will encrypt until n-1 block (included)
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my $truncated_cleartext_ticket = substr $cleartext_ticket, 0, -$len_cleartext_last_block;
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my $b_truncated_enc_ticket = $cbc->encrypt (hex2byte ($truncated_cleartext_ticket), $b_ke, $b_iv);
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my $b_enc_ticket_n_1_block= substr $b_truncated_enc_ticket, -16;
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my $b_enc_last_block = substr $b_enc_ticket_n_1_block, 0, $len_cleartext_last_block / 2;
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# we now craft the new n-1 block
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my $tmp = $b_enc_ticket_n_1_block ^ $b_cleartext_last_block_padded;
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$b_enc_ticket_n_1_block = $cbc->encrypt ($tmp, $b_ke, $b_iv);
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$tmp = substr $b_truncated_enc_ticket, 0, -16;
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$edata2 = $tmp . $b_enc_ticket_n_1_block . $b_enc_last_block;
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my $tmp_hash = sprintf ('$krb5asrep$17$%s$%s$%s$%s', $user, $realm, unpack ("H*", $checksum), unpack ("H*", $edata2));
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return $tmp_hash;
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}
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sub module_verify_hash
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{
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my $line = shift;
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my ($hash, $word) = split (':', $line);
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return unless defined $hash;
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return unless defined $word;
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my @data = split ('\$', $hash);
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return unless scalar @data == 7;
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shift @data;
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my $signature = shift @data;
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my $algorithm = shift @data;
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my $user = shift @data;
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my $realm = shift @data;
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my $checksum = shift @data;
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my $edata2 = shift @data;
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return unless ($signature eq "krb5asrep");
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return unless ($algorithm eq "17");
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return unless (length ($checksum) == 24);
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return unless (length ($edata2) >= 64);
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed, undef, $user, $realm, $checksum, $edata2);
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return ($new_hash, $word);
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}
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1;
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