85 lines
2.5 KiB
Ruby
85 lines
2.5 KiB
Ruby
# -*- coding: binary -*-
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module Rex
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module Proto
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module Kerberos
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module Model
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# This class provides a representation of a Kerberos AuthorizationData data
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# definition.
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class AuthorizationData < Element
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# @!attribute elements
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# @return [Hash{Symbol => <Fixnum, String>}] The type of the authorization data
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# @option [Fixnum] :type
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# @option [String] :data
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attr_accessor :elements
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# Rex::Proto::Kerberos::Model::AuthorizationData decoding isn't supported
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#
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# @raise [NotImplementedError]
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def decode(input)
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raise ::NotImplementedError, 'Authorization Data decoding not supported'
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end
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# Encodes a Rex::Proto::Kerberos::Model::AuthorizationData into an ASN.1 String
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#
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# @return [String]
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def encode
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seqs = []
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elements.each do |elem|
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elems = []
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type_asn1 = OpenSSL::ASN1::ASN1Data.new([encode_type(elem[:type])], 0, :CONTEXT_SPECIFIC)
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elems << type_asn1
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data_asn1 = OpenSSL::ASN1::ASN1Data.new([encode_data(elem[:data])], 1, :CONTEXT_SPECIFIC)
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elems << data_asn1
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seqs << OpenSSL::ASN1::Sequence.new(elems)
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end
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seq = OpenSSL::ASN1::Sequence.new(seqs)
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seq.to_der
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end
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# Encrypts the Rex::Proto::Kerberos::Model::AuthorizationData
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#
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# @param etype [Fixnum] the crypto schema to encrypt
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# @param key [String] the key to encrypt
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# @return [String] the encrypted result
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# @raise [NotImplementedError] if encryption schema isn't supported
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def encrypt(etype, key)
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data = self.encode
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res = ''
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case etype
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when RC4_HMAC
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res = encrypt_rc4_hmac(data, key, 5)
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else
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raise ::NotImplementedError, 'EncryptedData schema is not supported'
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end
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res
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end
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private
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# Encodes the type
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#
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# @return [OpenSSL::ASN1::Integer]
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def encode_type(type)
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bn = OpenSSL::BN.new(type.to_s)
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int = OpenSSL::ASN1::Integer.new(bn)
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int
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end
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# Encodes the data
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#
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# @return [OpenSSL::ASN1::OctetString]
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def encode_data(data)
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OpenSSL::ASN1::OctetString.new(data)
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end
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end
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end
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end
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end
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end |