116 lines
3.6 KiB
Ruby
116 lines
3.6 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 principal, an asset (e.g., a
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# workstation user or a network server) on a network.
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class PrincipalName < Element
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# @!attribute name_type
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# @return [Integer] The type of name
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attr_accessor :name_type
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# @!attribute name_string
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# @return [Array<String>] A sequence of strings that form a name.
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attr_accessor :name_string
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# Decodes a Rex::Proto::Kerberos::Model::PrincipalName
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#
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# @param input [String, OpenSSL::ASN1::Sequence] the input to decode from
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# @return [self] if decoding succeeds
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# @raise [RuntimeError] if decoding doesn't succeed
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def decode(input)
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case input
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when String
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decode_string(input)
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when OpenSSL::ASN1::Sequence
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decode_asn1(input)
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else
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raise ::RuntimeError, 'Failed to decode Principal Name, invalid input'
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end
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self
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end
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# Encodes a Rex::Proto::Kerberos::Model::PrincipalName into an
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# ASN.1 String
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#
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# @return [String]
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def encode
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integer_asn1 = OpenSSL::ASN1::ASN1Data.new([encode_name_type], 0, :CONTEXT_SPECIFIC)
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string_asn1 = OpenSSL::ASN1::ASN1Data.new([encode_name_string], 1, :CONTEXT_SPECIFIC)
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seq = OpenSSL::ASN1::Sequence.new([integer_asn1, string_asn1])
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seq.to_der
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end
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private
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# Encodes the name_type
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#
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# @return [OpenSSL::ASN1::Integer]
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def encode_name_type
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int_bn = OpenSSL::BN.new(name_type.to_s)
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int = OpenSSL::ASN1::Integer.new(int_bn)
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int
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end
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# Encodes the name_string
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#
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# @return [OpenSSL::ASN1::Sequence]
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def encode_name_string
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strings = []
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name_string.each do |s|
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strings << OpenSSL::ASN1::GeneralString.new(s)
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end
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seq_string = OpenSSL::ASN1::Sequence.new(strings)
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seq_string
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end
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# Decodes a Rex::Proto::Kerberos::Model::PrincipalName from an String
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#
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# @param input [String] the input to decode from
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def decode_string(input)
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asn1 = OpenSSL::ASN1.decode(input)
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decode_asn1(asn1)
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end
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# Decodes a Rex::Proto::Kerberos::Model::PrincipalName from an
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# OpenSSL::ASN1::Sequence
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#
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# @param input [OpenSSL::ASN1::Sequence] the input to decode from
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def decode_asn1(input)
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seq_values = input.value
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self.name_type = decode_name_type(seq_values[0])
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self.name_string = decode_name_string(seq_values[1])
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end
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# Decodes the name_type from an OpenSSL::ASN1::ASN1Data
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#
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# @param input [OpenSSL::ASN1::ASN1Data] the input to decode from
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# @return [Integer]
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def decode_name_type(input)
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input.value[0].value.to_i
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end
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# Decodes the name_string from an OpenSSL::ASN1::ASN1Data
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#
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# @param input [OpenSSL::ASN1::ASN1Data] the input to decode from
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# @return [Array<String>]
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def decode_name_string(input)
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strings = []
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input.value[0].value.each do |v|
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strings << v.value
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end
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strings
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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 |