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145 lines
4.3 KiB
Perl
145 lines
4.3 KiB
Perl
#!/usr/bin/env perl
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##
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## Author......: Robert Guetzkow
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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 Crypt::PBKDF2;
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use Crypt::Mode::CBC;
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use Crypt::Mode::ECB;
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# Details of the protocol design can be found in ISO 22510:2019 and
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# application notes published by the KNX Association.
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# ETS 5 allows a maximum of 20 characters in a password.
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# The salt is used as Secure Session Identifier, which is 2 Bytes long.
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sub module_constraints { [[0, 20], [2, 2], [-1, -1], [-1, -1], [-1, -1]] }
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sub device_authentication_code
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{
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my $password = shift;
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my $pbkdf2 = Crypt::PBKDF2->new
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(
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hasher => Crypt::PBKDF2->hasher_from_algorithm ("HMACSHA2", 256),
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iterations => 65536,
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output_len => 16
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);
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my $device_authentication_code = $pbkdf2->PBKDF2 ("device-authentication-code.1.secure.ip.knx.org",
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$password);
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return $device_authentication_code;
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}
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sub block_formatting
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{
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# Simplified block formatting function, where payload is always empty
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my $b0 = shift;
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my $associated_data = shift;
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my $associated_data_length = pack ("s>", length ($associated_data));
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my $blocks_unpadded = $associated_data_length . $associated_data;
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my $pad_len = int ((length ($blocks_unpadded) + 16 - 1) / 16) * 16;
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my $blocks_padded = $blocks_unpadded . "\0" x ($pad_len - length ($blocks_unpadded));
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return $b0 . $blocks_padded;
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}
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sub encrypt
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{
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# Simplified encryption that only performs steps required for the MAC, not full CCM
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my $blocks = shift;
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my $nonce = shift;
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my $key = shift;
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my $iv = "\0" x 16;
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my $aes_cbc = Crypt::Mode::CBC->new ("AES", 0);
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my $ciphertext = $aes_cbc->encrypt ($blocks, $key, $iv);
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my $y_n = substr ($ciphertext, length ($ciphertext) - 16, 16);
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my $aes_ecb = Crypt::Mode::ECB->new ("AES", 0);
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my $s_0 = $aes_ecb->encrypt ($nonce, $key);
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return $y_n ^ $s_0;
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}
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sub generate_session_response_mac
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{
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my $secure_session_identifier = shift;
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my $public_value_xor = shift;
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my $key = shift;
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# Constants used for the cryptography in Session_Response frames
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my $knx_ip_header = pack ("H*", "061009520038");
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my $b0 = pack ("H*", "00000000000000000000000000000000");
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my $nonce = pack ("H*", "0000000000000000000000000000ff00");
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my $associated_data = $knx_ip_header . $secure_session_identifier . $public_value_xor;
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my $blocks = block_formatting ($b0, $associated_data);
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return encrypt ($blocks, $nonce, $key);
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}
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sub module_generate_hash
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{
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my $word = shift;
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# Parameters that would be found in the Session_Request and Session_Response frames
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my $secure_session_identifier = shift;
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my $public_value_xor = shift // random_bytes (32);
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my $device_authentication_code = device_authentication_code ($word);
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my $mac = generate_session_response_mac ($secure_session_identifier,
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$public_value_xor,
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$device_authentication_code);
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my $hash = sprintf ("\$knx-ip-secure-device-authentication-code\$*%s*%s*%s",
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unpack ("H*", $secure_session_identifier),
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unpack ("H*", $public_value_xor),
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unpack ("H*", $mac));
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return $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) == 4;
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my $signature = shift @data;
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return unless ($signature eq "\$knx-ip-secure-device-authentication-code\$");
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my $secure_session_identifier = pack ("H*", shift @data); # 2 Bytes expected (using the "salt" for this purpose)
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my $public_value_xor = pack ("H*", shift @data); # 32 Bytes expected (xor of client's and server's public value)
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my $mac = pack ("H*", shift @data); # 16 Bytes expected
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return unless (length ($secure_session_identifier) == 2);
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return unless (length ($public_value_xor) == 32);
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return unless (length ($mac) == 16);
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed,
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$secure_session_identifier,
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$public_value_xor);
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return ($new_hash, $word);
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}
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1;
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