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86 lines
1.9 KiB
86 lines
1.9 KiB
#!/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 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 // "realm";
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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 => 32
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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 = pack ("H*", '6b65726265726f737b9b5b2b93132b93');
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my $b_iv = pack ("H*", '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, $b_iv);
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$b_key_bytes = $b_key_bytes . $cbc->encrypt ($b_key_bytes, $b_seed, $b_iv);
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my $tmp_hash = sprintf ('$krb5db$18$%s$%s$%s', $user, $realm, unpack ("H*", $b_key_bytes));
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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 == 6;
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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 $realm = shift @data;
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return unless ($signature eq "krb5db");
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return unless ($algorithm eq "18");
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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, $realm);
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return ($new_hash, $word);
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}
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1;
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