Class: Dap::Filter::FilterDecodeLdapSearchResult

Inherits:
Object
  • Object
show all
Includes:
BaseDecoder
Defined in:
lib/dap/filter/ldap.rb

Overview

Decode an LDAP SearchRequest probe response

Instance Attribute Summary

Attributes included from Base

#name, #opts

Instance Method Summary collapse

Methods included from BaseDecoder

#process

Methods included from Base

#initialize, #process

Instance Method Details

#decode(data) ⇒ Hash

Decode an LDAP SearchRequest probe response

Parameters:

  • data (String) —

    Binary string containing raw response from server

Returns:

  • (Hash) —

    Hash containing all LDAP responses



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# File 'lib/dap/filter/ldap.rb', line 20

def decode(data)
  info = {}

  # RFC 4511 - 4.5.2 SearchResult contains zero or more SearchResultEntry or
  # SearchResultReference messages followed by a single SearchResultDone
  # message.  OpenSSL::ASN1.decode doesn't handle the back to back Sequences
  # well, so identify the lengths and split them into individual ASN1 elements
  messages = Dap::Proto::LDAP.split_messages(data)

  if messages.empty?
    err_msg = 'FilterDecodeLdapSearchResult - Unable to parse response'
    info['Error'] = { 'errorMessage' => err_msg }
  end


  messages.each do |element|
    begin
      elem_decoded = OpenSSL::ASN1.decode(element)
      parsed_type, parsed_data = Dap::Proto::LDAP.parse_message(elem_decoded)
      info[parsed_type] = parsed_data if parsed_type && parsed_data
    rescue Exception => e
      err_msg = 'FilterDecodeLdapSearchResult - Unable to decode ASN.1 element'
      $stderr.puts "#{err_msg}: #{e}"
      $stderr.puts e.backtrace
      $stderr.puts "Element:\n\t#{element.inspect}"
      $stderr.puts "Element hex:\n\t#{element.unpack('H*')}\n\n"
      info['Error'] = { 'errorMessage' => err_msg }
      next
    end
  end

  info
end