Class: Rex::Proto::DCERPC::Response

Inherits:
Object
  • Object
show all
Defined in:
lib/rex/proto/dcerpc/response.rb

Constant Summary collapse

FLAG_FIRST_FRAG = 
1 << 0
FLAG_LAST_FRAG = 
1 << 1

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data) ⇒ Response

Create a new DCERPC::Response object This can be initialized in two ways: 1) Call .new() with the first 10 bytes of packet, then call parse on the rest 2) Call .new() with the full packet contents



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# File 'lib/rex/proto/dcerpc/response.rb', line 23

def initialize(data)

  self.ack_result = []
  self.ack_reason = []
  self.ack_xfer_syntax_uuid = []
  self.ack_xfer_syntax_vers = []

  if (! data or data.length < 10)
    raise Rex::Proto::DCERPC::Exceptions::InvalidPacket, 'DCERPC response packet is incomplete'
  end

  if (data.length == 10)
    self.frag_len = data[8,2].unpack('v')[0]
    self.raw = data
  end

  if (data.length > 10)
    self.raw = data
    self.parse
  end
end

Instance Attribute Details

#ack_reason ⇒ Object

Returns the value of attribute ack_reason.



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# File 'lib/rex/proto/dcerpc/response.rb', line 12

def ack_reason
  @ack_reason
end

#ack_result ⇒ Object

Returns the value of attribute ack_result.



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# File 'lib/rex/proto/dcerpc/response.rb', line 12

def ack_result
  @ack_result
end

#ack_xfer_syntax_uuid ⇒ Object

Returns the value of attribute ack_xfer_syntax_uuid.



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# File 'lib/rex/proto/dcerpc/response.rb', line 12

def ack_xfer_syntax_uuid
  @ack_xfer_syntax_uuid
end

#ack_xfer_syntax_vers ⇒ Object

Returns the value of attribute ack_xfer_syntax_vers.



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# File 'lib/rex/proto/dcerpc/response.rb', line 12

def ack_xfer_syntax_vers
  @ack_xfer_syntax_vers
end

#alloc_hint ⇒ Object

Returns the value of attribute alloc_hint.



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# File 'lib/rex/proto/dcerpc/response.rb', line 13

def alloc_hint
  @alloc_hint
end

#assoc_group ⇒ Object

Returns the value of attribute assoc_group.



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# File 'lib/rex/proto/dcerpc/response.rb', line 10

def assoc_group
  @assoc_group
end

#auth_len ⇒ Object

Returns the value of attribute auth_len.



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# File 'lib/rex/proto/dcerpc/response.rb', line 8

def auth_len
  @auth_len
end

#call_id ⇒ Object

Returns the value of attribute call_id.



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# File 'lib/rex/proto/dcerpc/response.rb', line 9

def call_id
  @call_id
end

#cancel_cnt ⇒ Object

Returns the value of attribute cancel_cnt.



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# File 'lib/rex/proto/dcerpc/response.rb', line 13

def cancel_cnt
  @cancel_cnt
end

#context_id ⇒ Object

Returns the value of attribute context_id.



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# File 'lib/rex/proto/dcerpc/response.rb', line 13

def context_id
  @context_id
end

#data_rep ⇒ Object

Returns the value of attribute data_rep.



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# File 'lib/rex/proto/dcerpc/response.rb', line 9

def data_rep
  @data_rep
end

#flags ⇒ Object

Returns the value of attribute flags.



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# File 'lib/rex/proto/dcerpc/response.rb', line 9

def flags
  @flags
end

#frag_len ⇒ Object

Returns the value of attribute frag_len.



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# File 'lib/rex/proto/dcerpc/response.rb', line 8

def frag_len
  @frag_len
end

#max_frag_recv ⇒ Object

Returns the value of attribute max_frag_recv.



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# File 'lib/rex/proto/dcerpc/response.rb', line 9

def max_frag_recv
  @max_frag_recv
end

#max_frag_xmit ⇒ Object

Returns the value of attribute max_frag_xmit.



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# File 'lib/rex/proto/dcerpc/response.rb', line 9

def max_frag_xmit
  @max_frag_xmit
end

#nack_reason ⇒ Object

Returns the value of attribute nack_reason.



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# File 'lib/rex/proto/dcerpc/response.rb', line 11

def nack_reason
  @nack_reason
end

#num_results ⇒ Object

Returns the value of attribute num_results.



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# File 'lib/rex/proto/dcerpc/response.rb', line 10

def num_results
  @num_results
end

#raw ⇒ Object

Returns the value of attribute raw.



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# File 'lib/rex/proto/dcerpc/response.rb', line 14

def raw
  @raw
end

#sec_addr ⇒ Object

Returns the value of attribute sec_addr.



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# File 'lib/rex/proto/dcerpc/response.rb', line 10

def sec_addr
  @sec_addr
end

#sec_addr_len ⇒ Object

Returns the value of attribute sec_addr_len.



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# File 'lib/rex/proto/dcerpc/response.rb', line 10

def sec_addr_len
  @sec_addr_len
end

#status ⇒ Object

Returns the value of attribute status.



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# File 'lib/rex/proto/dcerpc/response.rb', line 13

def status
  @status
end

#stub_data ⇒ Object

Returns the value of attribute stub_data.



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# File 'lib/rex/proto/dcerpc/response.rb', line 13

def stub_data
  @stub_data
end

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/rex/proto/dcerpc/response.rb', line 8

def type
  @type
end

#vers_major ⇒ Object

Returns the value of attribute vers_major.



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# File 'lib/rex/proto/dcerpc/response.rb', line 8

def vers_major
  @vers_major
end

#vers_minor ⇒ Object

Returns the value of attribute vers_minor.



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# File 'lib/rex/proto/dcerpc/response.rb', line 8

def vers_minor
  @vers_minor
end

#xfer_syntax_uuid ⇒ Object

Returns the value of attribute xfer_syntax_uuid.



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# File 'lib/rex/proto/dcerpc/response.rb', line 11

def xfer_syntax_uuid
  @xfer_syntax_uuid
end

#xfer_syntax_vers ⇒ Object

Returns the value of attribute xfer_syntax_vers.



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# File 'lib/rex/proto/dcerpc/response.rb', line 11

def xfer_syntax_vers
  @xfer_syntax_vers
end

Instance Method Details

#parse(body = '') ⇒ Object

Parse the contents of a DCERPC response packet and fill out all the fields



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# File 'lib/rex/proto/dcerpc/response.rb', line 46

def parse(body = '')
  self.raw = self.raw + body
  self.type = self.raw[2,1].unpack('C')[0]

  uuid = Rex::Proto::DCERPC::UUID
  data = self.raw

  if(not data)
    raise Rex::Proto::DCERPC::Exceptions::InvalidPacket, 'DCERPC response packet is incomplete'
  end

  # BIND_ACK == 12, ALTER_CONTEXT_RESP == 15
  if (self.type == 12 or self.type == 15)

    # Decode most of the DCERPC header
    self.vers_major,
    self.vers_minor,
    trash,
    self.flags,
    self.data_rep,
    self.frag_len,
    self.auth_len,
    self.call_id,
    self.max_frag_xmit,
    self.max_frag_recv,
    self.assoc_group,
    self.sec_addr_len = data.unpack('CCCCNvvVvvVv')


    if(not self.frag_len or data.length < self.frag_len)
      raise Rex::Proto::DCERPC::Exceptions::InvalidPacket, 'DCERPC response packet is incomplete'
    end

    # Keep an offset into the packet handy
    x = 0

    # XXX This is still somewhat broken (4 digit ports)
    self.sec_addr = data[26, self.sec_addr_len]

    # Move the pointer into the packet forward
    x += 26 + self.sec_addr_len

    # Align the pointer on a dword boundary
    while (x % 4 != 0)
      x += 1
    end

    # Figure out how many results we have (multiple-context binds)
    self.num_results = data[ x, 4 ].unpack('V')[0]

    # Move the pointer to the ack_result[0] offset
    x += 4

    # Initialize the ack_result index
    ack = 0

    # Scan through all results and add them to the result arrays
    while ack < self.num_results
      self.ack_result[ack] = data[ x + 0, 2 ].unpack('v')[0]
      self.ack_reason[ack] = data[ x + 2, 2 ].unpack('v')[0]
      self.ack_xfer_syntax_uuid[ack] = uuid.uuid_unpack(data[ x + 4, 16 ])
      self.ack_xfer_syntax_vers[ack] = data[ x + 20, 4 ].unpack('V')[0]
      x += 24
      ack += 1
    end

    # End of BIND_ACK || ALTER_CONTEXT_RESP
  end

  # BIND_NACK == 13
  if (self.type == 13)

    # Decode most of the DCERPC header
    self.vers_major,
    self.vers_minor,
    trash,
    self.flags,
    self.data_rep,
    self.frag_len,
    self.auth_len,
    self.call_id,
    self.nack_reason = data.unpack('CCCCNvvVv')
  end

  # RESPONSE == 2
  if (self.type == 2)

    # Decode the DCERPC response header
    self.vers_major,
    self.vers_minor,
    trash,
    self.flags,
    self.data_rep,
    self.frag_len,
    self.auth_len,
    self.call_id,
    self.alloc_hint,
    self.context_id,
    self.cancel_cnt = data.unpack('CCCCNvvVVvC')

    stub_offset = 24
    # Error out if the whole header was not read
    if !(self.alloc_hint and self.context_id and self.cancel_cnt)
      raise Rex::Proto::DCERPC::Exceptions::InvalidPacket, 'DCERPC response packet is incomplete'
    end

    # Put the application data into self.stub_data
    self.stub_data = data[stub_offset..self.frag_len - self.auth_len]
    # End of RESPONSE
  end

  # FAULT == 3
  if (self.type == 3)

    # Decode the DCERPC response header
    self.vers_major,
    self.vers_minor,
    trash,
    self.flags,
    self.data_rep,
    self.frag_len,
    self.auth_len,
    self.call_id,
    self.alloc_hint,
    self.context_id,
    self.cancel_cnt,
    trash,
    self.status = data.unpack('CCCCNvvVVvCCV')

    # Put the application data into self.stub_data
    self.stub_data = data[data.length - self.alloc_hint, 0xffff]
    # End of FAULT
  end

end