Add basic framework for interacting with MQTT

Gemfile.lock

@@ -20,6 +20,7 @@ PATH
       metasploit-payloads (= 1.3.19)
       metasploit_data_models
       metasploit_payloads-mettle (= 0.3.2)
+      mqtt
       msgpack
       nessus_rest
       net-ssh
@@ -192,6 +193,7 @@ GEM
     method_source (0.9.0)
     mini_portile2 (2.3.0)
     minitest (5.10.3)
+    mqtt (0.5.0)
     msgpack (1.2.0)
     multi_json (1.12.2)
     multipart-post (2.0.0)

lib/msf/core/auxiliary/mixins.rb

@@ -23,6 +23,7 @@ require 'msf/core/auxiliary/cisco'
 require 'msf/core/auxiliary/kademlia'
 require 'msf/core/auxiliary/llmnr'
 require 'msf/core/auxiliary/mdns'
+require 'msf/core/auxiliary/mqtt'
 require 'msf/core/auxiliary/nmap'
 require 'msf/core/auxiliary/natpmp'
 require 'msf/core/auxiliary/iax2'

lib/msf/core/auxiliary/mqtt.rb

@@ -0,0 +1,69 @@
+# -*- coding: binary -*-
+
+require 'msf/core/exploit'
+require 'rex/proto/mqtt'
+
+module Msf
+  module Auxiliary::MQTT
+      include Exploit::Remote::Tcp
+
+      def initialize(info = {})
+        super
+
+        register_options(
+          [
+            Opt::RPORT(Rex::Proto::MQTT::DEFAULT_PORT),
+            OptString.new('USERNAME', [false, 'The user to authenticate as']),
+            OptString.new('PASSWORD', [false, 'The password to authenticate with'])
+          ]
+        )
+
+        register_advanced_options(
+          [
+            OptString.new('CLIENT_ID', [false, 'The client ID to send if necessary for bypassing clientid_prefixes']),
+            OptInt.new('READ_TIMEOUT', [true, 'Seconds to wait while reading MQTT responses', 5])
+          ]
+        )
+
+        register_autofilter_ports([Rex::Proto::MQTT::DEFAULT_PORT])
+      end
+
+      def setup
+        fail_with(Failure::BadConfig, 'READ_TIMEOUT must be > 0') if read_timeout <= 0
+        client_id_arg = datastore['CLIENT_ID']
+        if client_id_arg
+          fail_with(Failure::BadConfig, 'CLIENT_ID must be a non-empty string') if client_id_arg.blank?
+        end
+      end
+
+      def read_timeout
+        datastore['READ_TIMEOUT']
+      end
+
+      def client_id
+        datastore['CLIENT_ID'] || Rex::Text.rand_text_alpha(1 + rand(10))
+      end
+
+      def mqtt_client
+        client_opts = {
+          client_id: client_id().to_s,
+          username: datastore['USERNAME'],
+          password: datastore['PASSWORD'],
+          read_timeout: read_timeout
+        }
+        Rex::Proto::MQTT::Client.new(sock, client_opts)
+      end
+
+      def mqtt_connect(client)
+        client.connect
+      end
+
+      def mqtt_connect?(client)
+        mqtt_connect(client).return_code == 0
+      end
+
+      def mqtt_disconnect(client)
+        client.disconnect
+      end
+    end
+end

lib/rex/proto/mqtt.rb

@@ -0,0 +1,14 @@
+# -*- coding: binary -*-
+#
+# Support for MQTT
+
+require 'rex/proto/mqtt/client'
+
+module Rex
+  module Proto
+    module MQTT
+      DEFAULT_PORT = 1883
+      DEFAULT_SSL_PORT = 8883
+    end
+  end
+end

lib/rex/proto/mqtt/client.rb

@@ -0,0 +1,42 @@
+# -*- coding: binary -*-
+
+require 'mqtt'
+
+##
+# MQTT protocol support
+##
+
+module Rex
+  module Proto
+    module MQTT
+      class Client
+
+        def initialize(sock, opts = {})
+          @sock = sock
+          @opts = opts
+        end
+
+        def connect
+          connect_opts = {
+            client_id: @opts[:client_id],
+            username: @opts[:username],
+            password: @opts[:password]
+          }
+          connect = ::MQTT::Packet::Connect.new(connect_opts).to_s
+          @sock.put(connect)
+          res = @sock.get_once(-1, @opts[:read_timeout])
+          ::MQTT::Packet.parse(res)
+        end
+
+        def connect?
+          connect.return_code == 0
+        end
+
+        def disconnect
+          disconnect = ::MQTT::Packet::Disconnect.new().to_s
+          @sock.put(disconnect)
+        end
+      end
+    end
+  end
+end

metasploit-framework.gemspec

@@ -123,6 +123,7 @@ Gem::Specification.new do |spec|
   # Protocol Libraries
   #
   spec.add_runtime_dependency 'dnsruby'
+  spec.add_runtime_dependency 'mqtt'
   spec.add_runtime_dependency 'net-ssh'
   spec.add_runtime_dependency 'rbnacl', ['< 5.0.0']
   spec.add_runtime_dependency 'bcrypt_pbkdf'