Class: Rex::Proto::Kerberos::Model::PreAuthDataEntry

Inherits:
Element
  • Object
show all
Defined in:
lib/rex/proto/kerberos/model/pre_auth_data_entry.rb

Overview

This class provides a representation for Kerberos pre authenticated data entry.

Constant Summary

Constants included from Rex::Proto::Kerberos::Model

AP_REP, AP_REQ, AS_REP, AS_REQ, AUTHENTICATOR, ENC_AP_REP_PART, ENC_KRB_CRED_PART, KRB_CRED, KRB_ERROR, TGS_REP, TGS_REQ, TICKET, VERSION

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Element

attr_accessor, attributes, #attributes, decode, #initialize

Constructor Details

This class inherits a constructor from Rex::Proto::Kerberos::Model::Element

Instance Attribute Details

#type ⇒ Integer

Returns The padata type.

Returns:

  • (Integer) —

    The padata type



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# File 'lib/rex/proto/kerberos/model/pre_auth_data_entry.rb', line 13

def type
  @type
end

#value ⇒ String

Returns The padata value, encoded.

Returns:

  • (String) —

    The padata value, encoded



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# File 'lib/rex/proto/kerberos/model/pre_auth_data_entry.rb', line 16

def value
  @value
end

Instance Method Details

#decode(input) ⇒ self

Decodes a Rex::Proto::Kerberos::Model::PreAuthDataEntry

Parameters:

  • input (String, OpenSSL::ASN1::Sequence) —

    the input to decode from

Returns:

  • (self) —

    if decoding succeeds

Raises:



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# File 'lib/rex/proto/kerberos/model/pre_auth_data_entry.rb', line 23

def decode(input)
  case input
  when String
    decode_string(input)
  when OpenSSL::ASN1::ASN1Data
    decode_asn1(input)
  when OpenSSL::ASN1::Sequence
    decode_asn1(input)
  else
    raise ::Rex::Proto::Kerberos::Model::Error::KerberosDecodingError, 'Failed to decode PreAuthDataEntry, invalid input'
  end

  self
end

#decoded_value ⇒ Object

Gets the value of this PreAuthDataEntry as its instantiated object, based on the type

Returns:

  • (Object) —

    e.g. PreAuthEncTimeStamp, PreAuthEtypeInfo2



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# File 'lib/rex/proto/kerberos/model/pre_auth_data_entry.rb', line 53

def decoded_value
  case self.type
  when Rex::Proto::Kerberos::Model::PreAuthType::PA_TGS_REQ
    decoded = OpenSSL::ASN1.decode(self.value)
    ApReq.decode(decoded)
  when Rex::Proto::Kerberos::Model::PreAuthType::PA_ENC_TIMESTAMP
    decoded = OpenSSL::ASN1.decode(self.value)
    PreAuthEncTimeStamp.decode(decoded)
  when Rex::Proto::Kerberos::Model::PreAuthType::PA_PW_SALT
    # This is not DER_encoded - just pass the string directly
    PreAuthPwSalt.decode(self.value)
  when Rex::Proto::Kerberos::Model::PreAuthType::PA_ETYPE_INFO
    # Not yet supported
  when Rex::Proto::Kerberos::Model::PreAuthType::PA_PK_AS_REQ
     PreAuthPkAsReq.decode(self.value)
  when Rex::Proto::Kerberos::Model::PreAuthType::PA_PK_AS_REP
     PreAuthPkAsRep.decode(self.value)
  when Rex::Proto::Kerberos::Model::PreAuthType::PA_ETYPE_INFO2
    decoded = OpenSSL::ASN1.decode(self.value)
    PreAuthEtypeInfo2.decode(decoded)
  when Rex::Proto::Kerberos::Model::PreAuthType::PA_PAC_REQUEST
    decoded = OpenSSL::ASN1.decode(self.value)
    PreAuthPacRequest.decode(decoded)
  when Rex::Proto::Kerberos::Model::PreAuthType::PA_FOR_USER
    decoded = OpenSSL::ASN1.decode(self.value)
    PreAuthForUser.decode(decoded)
  else
    # Unknown type - just ignore for now
  end
end

#encode ⇒ String

Encodes a Rex::Proto::Kerberos::Model::PreAuthDataEntry into an ASN.1 String

Returns:

  • (String) 


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# File 'lib/rex/proto/kerberos/model/pre_auth_data_entry.rb', line 41

def encode
  type_asn1 = OpenSSL::ASN1::ASN1Data.new([encode_type], 1, :CONTEXT_SPECIFIC)
  value_asn1 = OpenSSL::ASN1::ASN1Data.new([encode_value], 2, :CONTEXT_SPECIFIC)
  seq = OpenSSL::ASN1::Sequence.new([type_asn1, value_asn1])

  seq.to_der
end