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# -*- coding: binary -*-
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module Msf
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  ###
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  #
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  # This module provides methods for working with redis
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  #
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  ###
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  module Auxiliary::Redis
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    include Msf::Exploit::Remote::Tcp
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    include Auxiliary::Scanner
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    include Auxiliary::Report
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    #
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    # Initializes an instance of an auxiliary module that interacts with Redis
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    #
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    def initialize(info = {})
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      super
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      register_options(
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        [
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          Opt::RPORT(6379),
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          OptString.new('PASSWORD', [false, 'Redis password for authentication test', 'foobared'])
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        ]
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      )
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      register_advanced_options(
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        [
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          OptInt.new('READ_TIMEOUT', [true, 'Seconds to wait while reading redis responses', 2])
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        ]
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      )
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    end
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    def read_timeout
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      datastore['READ_TIMEOUT']
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    end
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    def report_redis(version)
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      report_service(
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        host: rhost,
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        port: rport,
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        proto: 'tcp',
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        name: 'redis',
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        info: "version #{version}"
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      )
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    end
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    def redis_command(*commands)
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      command_string = printable_redis_response(commands.join(' '))
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      unless (command_response = send_redis_command(*commands))
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        vprint_error("No response to '#{command_string}'")
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        return
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      end
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      if (match = authentication_required?(command_response))
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        auth_response = match[:auth_response]
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        fail_with(::Msf::Module::Failure::BadConfig, "#{peer} requires authentication but Password unset") unless datastore['Password']
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        vprint_status("Requires authentication (#{printable_redis_response(auth_response, false)})")
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        if (auth_response = send_redis_command('AUTH', datastore['PASSWORD']))
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          unless auth_response =~ Rex::Proto::Redis::Base::Constants::OKAY
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            vprint_error("Authentication failure: #{printable_redis_response(auth_response)}")
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            return
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          end
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          vprint_status("Authenticated")
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          unless (command_response = send_redis_command(*commands))
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            vprint_error("No response to '#{command_string}'")
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            return
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          end
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        else
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          vprint_status("Authentication failed; no response")
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          return
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        end
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      end
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      vprint_status("Redis command '#{command_string}' got '#{printable_redis_response(command_response)}'")
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      command_response
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    end
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    def parse_redis_response(response)
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      parser = RESPParser.new(response)
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      parser.parse
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    end
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    def printable_redis_response(response_data, convert_whitespace = true)
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      Rex::Text.ascii_safe_hex(response_data, convert_whitespace)
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    end
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    private
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    # Verifies whether the response indicates if authentication is required
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    # @return [RESPParser] Returns a matched response if a hit is there; otherwise nil.
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    def authentication_required?(response)
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      response.match(Rex::Proto::Redis::Base::Constants::AUTHENTICATION_REQUIRED) ||
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        response.match(Rex::Proto::Redis::Version6::Constants::AUTHENTICATION_REQUIRED)
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    end
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    def redis_proto(command_parts)
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      return if command_parts.blank?
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      command = "*#{command_parts.length}\r\n"
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      command_parts.each do |c|
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        command << "$#{c.length}\r\n#{c}\r\n"
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      end
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      command
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    end
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    def send_redis_command(*command_parts)
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      sock.put(redis_proto(command_parts))
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      command_response = sock.get(read_timeout)
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      return unless command_response
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      command_response.strip
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    end
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    class RESPParser
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      LINE_BREAK = "\r\n"
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      def initialize(data)
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        @raw_data = data
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        @counter = 0
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      end
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      def parse
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        @counter = 0
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        parse_next
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      end
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      def data_at_counter
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        @raw_data[@counter..-1]
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      end
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      def parse_resp_array
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        # Read array length
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        unless /\A\*(?<arr_len>\d+)(\r|$)/ =~ data_at_counter
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          raise "RESP parsing error in array"
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        end
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        @counter += (1 + arr_len.length)
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        if data_at_counter.start_with?(LINE_BREAK)
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          @counter += LINE_BREAK.length
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        end
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        arr_len = arr_len.to_i
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        result = []
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        for index in 1..arr_len do
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          element = parse_next
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          result.append(element)
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        end
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        result
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      end
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      def parse_simple_string
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        str_end = data_at_counter.index(LINE_BREAK)
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        str_end = str_end.to_i
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        result = data_at_counter[1..str_end - 1]
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        @counter += str_end
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        @counter += 2 # Skip over next CLRF
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        result
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      end
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      def parse_bulk_string
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        unless /\A\$(?<str_len>[-\d]+)(\r|$)/ =~ data_at_counter
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          raise "RESP parsing error in bulk string"
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        end
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        @counter += (1 + str_len.length)
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        str_len = str_len.to_i
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        if data_at_counter.start_with?(LINE_BREAK)
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          @counter += LINE_BREAK.length
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        end
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        result = nil
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        if str_len != -1
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          result = data_at_counter[0..str_len - 1]
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          @counter += str_len
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          @counter += 2 # Skip over next CLRF
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        end
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        result
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      end
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      def parse_next
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        case data_at_counter[0]
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        when "*"
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          parse_resp_array
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        when "+"
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          parse_simple_string
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        when "$"
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          parse_bulk_string
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        else
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          raise "RESP parsing error: " + data_at_counter
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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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