Class: Msf::PayloadSet

Inherits:
ModuleSet show all
Defined in:
lib/msf/core/payload_set.rb

Overview

This class is a special case of the generic module set class because payloads are generated in terms of combinations between various components, such as a stager and a stage. As such, the payload set needs to be built on the fly and cannot be simply matched one-to-one with a payload module. Yeah, the term module is kind of overloaded here, but eat it!

Instance Attribute Summary collapse

Attributes inherited from ModuleSet

#ambiguous_module_reference_name_set, #architectures_by_module, #mod_extensions, #mod_sorted, #module_type, #platforms_by_module

Attributes included from Framework::Offspring

#framework

Instance Method Summary collapse

Methods inherited from ModuleSet

#[], #create, #each, #each_module, #each_module_list, #each_module_ranked, #force_load_set, #load_module_class, #module_metadata, #module_refnames, #rank_modules, #valid?

Constructor Details

#initialize ⇒ PayloadSet

Creates an instance of a payload set which is just a specialized module set class that has custom handling for payloads.



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# File 'lib/msf/core/payload_set.rb', line 20

def initialize
  super(Msf::MODULE_PAYLOAD)

  # A hash of each of the payload types that holds an array
  # for all of the associated modules
  self.payload_type_modules = {}

  # Initialize the hash entry for each type to an empty list
  [
    Payload::Type::Single,
    Payload::Type::Stager,
    Payload::Type::Stage,
    Payload::Type::Adapter
  ].each { |type|
    self.payload_type_modules[type] = {}
  }

  # Initialize hashes for each of the stages and singles.  Stagers
  # never exist independent.  The stages hash will have entries that
  # point to another hash that point to the per-stager implementation
  # payload class.  For instance:
  #
  # ['windows/shell']['reverse_tcp']
  #
  # Singles will simply point to the single payload class.
  self.stages  = {}
  self.singles = {}

  # Single instance cache of modules for use with doing quick referencing
  # of attributes that would require an instance.
  self._instances = {}

  # Initializes an empty blob cache
  @blob_cache = {}
end

Instance Attribute Details

#_instances ⇒ Object (protected)

:nodoc:



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# File 'lib/msf/core/payload_set.rb', line 665

def _instances
  @_instances
end

#payload_type_modules ⇒ Object (protected)

:nodoc:



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# File 'lib/msf/core/payload_set.rb', line 663

def payload_type_modules
  @payload_type_modules
end

#singles ⇒ Object

The list of singles that have been loaded.



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# File 'lib/msf/core/payload_set.rb', line 608

def singles
  @singles
end

#stages ⇒ Object

The list of stages that have been loaded.



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# File 'lib/msf/core/payload_set.rb', line 604

def stages
  @stages
end

Instance Method Details

#_adapters ⇒ Object (protected) 



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# File 'lib/msf/core/payload_set.rb', line 612

def _adapters
  return payload_type_modules[Payload::Type::Adapter] || {}
end

#_singles ⇒ Object (protected)

Return the hash of single payloads



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# File 'lib/msf/core/payload_set.rb', line 619

def _singles
  return payload_type_modules[Payload::Type::Single] || {}
end

#_stagers ⇒ Object (protected)

Return the hash of stager payloads



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# File 'lib/msf/core/payload_set.rb', line 626

def _stagers
  return payload_type_modules[Payload::Type::Stager] || {}
end

#_stages ⇒ Object (protected)

Return the hash of stage payloads



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# File 'lib/msf/core/payload_set.rb', line 633

def _stages
  return payload_type_modules[Payload::Type::Stage] || {}
end

#add_blob_cache(key, blob, offsets) ⇒ Object

Adds a blob to the blob cache so that the payload does not have to be recompiled in the future



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# File 'lib/msf/core/payload_set.rb', line 582

def add_blob_cache(key, blob, offsets)
  @blob_cache[key] = [ blob, offsets ]
end

#add_cached_module(cached_module_metadata) ⇒ Object 



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# File 'lib/msf/core/payload_set.rb', line 351

def add_cached_module(cached_module_metadata)
  case cached_module_metadata.payload_type
  when Payload::Type::Single
    single_name = cached_module_metadata.ref_name
    single_info = load_payload_component(Payload::Type::Single, single_name)
    calculate_single_payload(single_name: single_name, single_info: single_info)
  when Payload::Type::Stager
    stager_refname = cached_module_metadata.stager_refname
    stager_info = load_payload_component(Payload::Type::Stager, stager_refname)
    stage_name = cached_module_metadata.stage_refname
    stage_info = load_payload_component(Payload::Type::Stage, stage_name)

    calculate_staged_payload(stage_name: stage_name,
                             stager_name: stager_refname,
                             stage_info: stage_info,
                             stager_info: stager_info)

  when Payload::Type::Adapter
    adapter_name = cached_module_metadata.adapter_refname
    adapter_info = load_payload_component(Payload::Type::Adapter, adapter_name)

    if cached_module_metadata.staged
      stage_name = cached_module_metadata.stage_refname

      stage_info = load_payload_component(Payload::Type::Stage, stage_name)
      stager_name= cached_module_metadata.stager_refname
      stager_info = load_payload_component(Payload::Type::Stager, stager_name)

      staged_payload = self[cached_module_metadata.adapted_refname]

      calculate_adapted_staged_payload(staged_payload: staged_payload,
                                       adapter_name: adapter_name,
                                       stage_info: stage_info,
                                       stager_info: stager_info,
                                       adapter_info: adapter_info)
    else
      single_name = cached_module_metadata.adapted_refname
      single_info = load_payload_component(Payload::Type::Single, single_name)
      single_payload = self[single_name]
      calculate_adapted_single_payload(adapter_name: adapter_name,
                                       adapter_info: adapter_info,
                                       single_info: single_info,
                                       single_payload: single_payload)
    end
  end
rescue ::Msf::MissingPayloadError => e
  elog("Missing payload component for #{cached_module_metadata.ref_name}", error: e)
  return nil
rescue StandardError => e
  elog("#{cached_module_metadata.ref_name} failed to load", error: e)
  return nil
end

#add_module(payload_module, reference_name, modinfo = {}) ⇒ void

This method returns an undefined value.

This method is called when a new payload module class is loaded up. For the payload set we simply create an instance of the class and do some magic to figure out if it’s a single, stager, or stage. Depending on which it is, we add it to the appropriate list.

Parameters:

  • payload_module (::Module) —

    The module name.

  • reference_name (String) —

    The module reference name.

  • modinfo (Hash{String => Array}) (defaults to: {}) —

    additional information about the module.

Options Hash (modinfo):

  • 'files' (Array<String>) —

    List of paths to the ruby source files where class_or_module is defined.

  • 'paths' (Array<String>) —

    List of module reference names.

  • 'type' (String) —

    The module type, should match positional type argument.



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# File 'lib/msf/core/payload_set.rb', line 315

def add_module(payload_module, reference_name, modinfo={})
  if modinfo['cached_metadata']
    return add_cached_module(modinfo['cached_metadata'])
  end

  if (match_data = reference_name.match(/^(adapters|singles|stagers|stages)#{File::SEPARATOR}(.*)$/))
    ptype = match_data[1]
    reference_name  = match_data[2]
  end

  # Duplicate the Payload base class and extend it with the module
  # class that is passed in.  This allows us to inspect the actual
  # module to see what type it is, and to grab other information for
  # our own evil purposes.
  instance = build_payload(payload_module).new

  # Create an array of information about this payload module
  pinfo =
    [
      payload_module,
      instance.handler_klass,
      instance.platform,
      instance.arch,
      instance,
      modinfo
    ]

  # Use the module's preferred alias if it has one
  reference_name = instance.alias if (instance.alias)

  # Store the module and alias name for this payload.  We
  # also convey other information about the module, such as
  # the platforms and architectures it supports
  payload_type_modules[instance.payload_type][reference_name] = pinfo
end

#add_single(p, name, modinfo, adapted_refname: nil, adapter_refname: nil) ⇒ Object

This method adds a single payload to the set and adds it to the singles hash.



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# File 'lib/msf/core/payload_set.rb', line 507

def add_single(p, name, modinfo, adapted_refname: nil, adapter_refname: nil)
  p.framework = framework
  p.refname = name
  p.file_path = modinfo['files'][0]
  p.adapted_refname = adapted_refname
  p.adapter_refname = adapter_refname

  # Associate this class with the single payload's name
  self[name] = p

  # Add the singles hash
  singles[name] = p

  dlog("Built single payload #{name}.", 'core', LEV_2)
end

#add_stage(p, full_name, stage_name, handler_type, modinfo) ⇒ Object

This method adds a stage payload to the set and adds it to the stages hash using the supplied handler type.



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# File 'lib/msf/core/payload_set.rb', line 527

def add_stage(p, full_name, stage_name, handler_type, modinfo)
  p.framework = framework
  p.refname = full_name
  p.file_path = modinfo['files'][0]

  # Associate this stage's full name with the payload class in the set
  self[full_name] = p

  # Create the hash entry for this stage and then create
  # the associated entry for the handler type
  stages[stage_name] = {} if (!stages[stage_name])

  # Add it to this stage's stager hash
  stages[stage_name][handler_type] = p

  dlog("Built staged payload #{full_name}.", 'core', LEV_2)
end

#build_adapted_name(aname, pname) ⇒ Object (protected) 



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# File 'lib/msf/core/payload_set.rb', line 654

def build_adapted_name(aname, pname)
  aparts = aname.split('/')
  pparts = pname.split('/')
  pparts.shift if aparts.last.start_with?(pparts.first)
  aparts.each { |apart| pparts.delete(apart) if pparts.include?(apart) }

  (aparts + pparts).join('/')
end

#build_payload(*modules) ⇒ Object (protected)

Builds a duplicate, extended version of the Payload base class using the supplied modules.



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# File 'lib/msf/core/payload_set.rb', line 641

def build_payload(*modules)
  klass = Class.new(Payload)

  # Remove nil modules
  modules.compact!

  # Include the modules supplied to us with the mad skillz
  # spoonfu style
  klass.include(*modules.reverse)

  return klass
end

#calculate_adapted_single_payload(adapter_name:, adapter_info:, single_info:, single_payload:) ⇒ Object 



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# File 'lib/msf/core/payload_set.rb', line 151

def calculate_adapted_single_payload(adapter_name:, adapter_info:, single_info:, single_payload:)
  adapter_mod, _, _adapter_platform, _adapter_arch, adapter_inst, adapted_modinfo = adapter_info
  single_mod, handler, _single_platform, _single_arch, _single_inst, _single_modinfo = single_info

  return nil unless single_payload && adapter_inst.compatible?(single_payload.new)

  payload = build_payload(handler, single_mod, adapter_mod)

  adapted_name = build_adapted_name(adapter_name, single_payload.refname)
  add_single(payload, adapted_name, adapted_modinfo, adapted_refname: single_payload.refname, adapter_refname: adapter_name)

  payload
end

#calculate_adapted_staged_payload(staged_payload:, adapter_name:, stage_info:, stager_info:, adapter_info:) ⇒ Object 



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# File 'lib/msf/core/payload_set.rb', line 278

def calculate_adapted_staged_payload(staged_payload:, adapter_name:, stage_info:, stager_info:, adapter_info:)
  stage_mod, _, _stage_platform, _stage_arch, _stage_inst = stage_info
  stager_mod, handler, _stager_platform, _stager_arch, _stager_inst, _stager_modinfo = stager_info
  adapter_mod, _, _adapter_platform, _adapter_arch, adapter_inst, adapter_modinfo = adapter_info

  return nil unless staged_payload && adapter_inst.compatible?(staged_payload.new)

  payload = build_payload(handler, stager_mod, stage_mod, adapter_mod)

  adapted_refname = build_adapted_name(adapter_name, staged_payload.refname)
  payload.refname = adapted_refname
  payload.framework = framework
  payload.file_path = adapter_modinfo['files'][0]
  payload.adapted_refname = staged_payload.refname
  payload.adapter_refname = adapter_name
  payload.stage_refname = staged_payload.stage_refname
  payload.stager_refname = staged_payload.stager_refname

  self[payload.refname] = payload
  payload
end

#calculate_single_payload(single_name:, single_info:) ⇒ Object 



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# File 'lib/msf/core/payload_set.rb', line 129

def calculate_single_payload(single_name:, single_info:)
  mod, handler, _single_platform, _single_arch, single_inst, single_modinfo = single_info

  # if the payload has a dependency, check
  # if it is supported on the system
  payload_dependencies = single_inst.dependencies
  unless payload_dependencies.empty?
    supported = payload_dependencies.all?(&:available?)
    elog("Dependency for #{single_name} is not supported") unless supported
    return nil unless supported
  end

  # Build the payload dupe using the determined handler
  # and module
  payload = build_payload(handler, mod)

  # Add it to the set
  add_single(payload, single_name, single_modinfo)

  payload
end

#calculate_staged_payload(stage_name:, stager_name:, stage_info:, stager_info:) ⇒ Object 



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# File 'lib/msf/core/payload_set.rb', line 235

def calculate_staged_payload(stage_name:, stager_name:, stage_info:, stager_info:)
  # if the stager or stage has a dependency, check
  # if they are compatible
  return nil unless stage_and_stager_compatible?(stager_info: stager_info,
                                                 stage_info: stage_info,
                                                 stager_name: stager_name,
                                                 stage_name: stage_name)

  stager_mod, handler, _stager_platform, _stager_arch, _stager_inst, stager_modinfo = stager_info
  stage_mod, _, _stage_platform, _stage_arch, _stage_inst, stage_modinfo = stage_info
  # Build the payload dupe using the handler, stager,
  # and stage
  payload = build_payload(handler, stager_mod, stage_mod)

  # If the stager has an alias for the handler type (such as is the
  # case for ordinal based stagers), use it in preference of the
  # handler's actual type.
  if (stager_mod.respond_to?('handler_type_alias') == true)
    handler_type = stager_mod.handler_type_alias
  else
    handler_type = handler.handler_type
  end

  # Associate the name as a combination of the stager and stage
  staged_refname = stage_name

  # If a valid handler exists for this stager, then combine it
  staged_refname += '/' + handler_type

  # Sets the modules derived name
  payload.refname = staged_refname
  payload.stage_refname = stage_name
  payload.stager_refname = stager_name

  # Add the stage
  add_stage(payload, staged_refname, stage_name, handler_type, {
    'files' => stager_modinfo['files'] + stage_modinfo['files'],
    'paths' => stager_modinfo['paths'] + stage_modinfo['paths'],
    'type' => stager_modinfo['type'] })

  payload
end

#check_blob_cache(key) ⇒ Object

Checks to see if a payload has a blob cache entry. If it does, the blob is returned to the caller.



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# File 'lib/msf/core/payload_set.rb', line 590

def check_blob_cache(key)
  @blob_cache[key]
end

#each_module_filter(opts, name, mod) ⇒ Object

Performs custom filtering during each_module enumeration. This allows us to filter out certain stagers as necessary.



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# File 'lib/msf/core/payload_set.rb', line 60

def each_module_filter(opts, name, mod)
  return false
end

#find_payload(platform, arch, handler, session, payload_type) ⇒ Object

Looks for a payload that matches the specified requirements and returns an instance of that payload.



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# File 'lib/msf/core/payload_set.rb', line 452

def find_payload(platform, arch, handler, session, payload_type)
  # Pre-filter based on platform and architecture.
  each_module(
    'Platform' => platform,
    'Arch'     => arch) { |name, mod|

    p = mod.new

    # We can't substitute one generic with another one.
    next if (p.kind_of?(Msf::Payload::Generic))

    # Check to see if the handler classes match.
    next if (handler and not p.handler_klass.ancestors.include?(handler))

    # Check to see if the session classes match.
    next if (session and p.session and not p.session.ancestors.include?(session))

    # Check for matching payload types
    next if (payload_type and p.payload_type != payload_type)

    return p
  }

  return nil
end

#find_payload_from_set(set, platform, arch, handler, session, payload_type) ⇒ Object

Looks for a payload from a given set that matches the specified requirements and returns an instance of that payload.



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# File 'lib/msf/core/payload_set.rb', line 482

def find_payload_from_set(set, platform, arch, handler, session, payload_type)
  set.each do |name, mod|
    p = mod.new

    # We can't substitute one generic with another one.
    next if (p.kind_of?(Msf::Payload::Generic))

    # Check to see if the handler classes match.
    next if (handler and p.handler_klass != handler)

    # Check to see if the session classes match.
    next if (session and p.session != session)

    # Check for matching payload types
    next if (payload_type and p.payload_type != payload_type)

    return p
  end
  return nil
end

#flush_blob_cache ⇒ Object

Flushes all entries from the blob cache



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# File 'lib/msf/core/payload_set.rb', line 597

def flush_blob_cache
  @blob_cache.clear
end

#instance(name) ⇒ Object

Returns a single read-only instance of the supplied payload name such that specific attributes, like compatibility, can be evaluated. The payload instance returned should NOT be used for anything other than reading.



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# File 'lib/msf/core/payload_set.rb', line 551

def instance(name)
  if (self._instances[name] == nil)
    self._instances[name] = create(name)
  end

  self._instances[name]
end

#load_payload_component(payload_type, refname) ⇒ Object 



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# File 'lib/msf/core/payload_set.rb', line 404

def load_payload_component(payload_type, refname)
  payload_type_cache, folder_name = case payload_type
                                    when Payload::Type::Single
                                      [_singles, 'singles']
                                    when Payload::Type::Stage
                                      [_stages, 'stages']
                                    when Payload::Type::Stager
                                      [_stagers, 'stagers']
                                    when Payload::Type::Adapter
                                      [_adapters, 'adapters']
                                    else
                                      raise ArgumentError("Invalid payload type: #{payload_type}")
                                    end

  payload_component_info = payload_type_cache[refname]
  unless payload_component_info
    raise Msf::MissingPayloadError, "#{refname} is not available"
  end

  payload_component_info
end

#on_module_reload(mod) ⇒ Object

When a payload module is reloaded, the blob cache entry associated with it must be removed (if one exists)



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# File 'lib/msf/core/payload_set.rb', line 570

def on_module_reload(mod)
  @blob_cache.each_key do |key|
    if key.start_with? mod.refname
      @blob_cache.delete(key)
    end
  end
end

#recalculate ⇒ Object

This method builds the hash of alias names based on all the permutations of singles, stagers, and stages.



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# File 'lib/msf/core/payload_set.rb', line 68

def recalculate
  old_keys = self.keys
  new_keys = []

  # Recalculate single payloads
  _singles.each_pair do |single_name, single_info|
    single_payload = calculate_single_payload(single_name: single_name, single_info: single_info)
    next unless single_payload

    new_keys.push single_name

    _adapters.each_pair do |adapter_name, adapter_info|
      adapted_single = calculate_adapted_single_payload(adapter_name: adapter_name,
                                                        adapter_info: adapter_info,
                                                        single_info: single_info,
                                                        single_payload: single_payload)
      next unless adapted_single

      new_keys.push adapted_single.refname
    end
  end

  # Recalculate staged payloads
  _stagers.each_pair do |stager_name, stager_info|
    _stager_mod, _handler, _stager_platform, _stager_arch, stager_inst, _stager_modinfo = stager_info

    next unless stager_dependencies_available?(stager_name: stager_name, stager_dependencies: stager_inst.dependencies)

    # Walk the array of stages
    _stages.each_pair do |stage_name, stage_info|

      staged_payload = calculate_staged_payload(stage_name: stage_name,
                                                stager_name: stager_name,
                                                stage_info: stage_info,
                                                stager_info: stager_info)
      next unless staged_payload

      new_keys.push staged_payload.refname

      _adapters.each_pair do |adapter_name, adapter_info|
        adapted_staged_payload = calculate_adapted_staged_payload(staged_payload: staged_payload,
                                                                  adapter_name: adapter_name,
                                                                  stage_info: stage_info,
                                                                  stager_info: stager_info,
                                                                  adapter_info: adapter_info)
        next unless adapted_staged_payload

        new_keys.push adapted_staged_payload.refname
      end
    end
  end

  # Blow away anything that was cached but didn't exist during the
  # recalculation
  self.delete_if do |k, _v|
    !!(old_keys.include?(k) and not new_keys.include?(k))
  end

  flush_blob_cache
end

#stage_and_stager_compatible?(stager_info:, stage_info:, stager_name:, stage_name:) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/msf/core/payload_set.rb', line 176

def stage_and_stager_compatible?(stager_info:, stage_info:, stager_name:, stage_name:)
  _stager_mod, _handler, stager_platform, stager_arch, stager_inst = stager_info
  _stage_mod, _, stage_platform, stage_arch, stage_inst = stage_info

  stager_dependencies = stager_inst.dependencies
  stage_dependencies = stage_inst.dependencies

  unless stager_dependencies.empty? && stage_dependencies.empty?
    return false unless stager_dependencies == stage_dependencies
  end

  # No intersection between platforms on the payloads?
  if ((stager_platform) and
    (stage_platform) and
    (stager_platform & stage_platform).empty?)
    dlog("Stager #{stager_name} and stage #{stage_name} have incompatible platforms: #{stager_platform.names} - #{stage_platform.names}", 'core', LEV_2)
    return false
  end

  # No intersection between architectures on the payloads?
  if ((stager_arch) and
    (stage_arch) and
    ((stager_arch & stage_arch).empty?))
    dlog("Stager #{stager_name} and stage #{stage_name} have incompatible architectures: #{stager_arch.join} - #{stage_arch.join}", 'core', LEV_2)
    return false
  end

  # If the stage has a convention, make sure it's compatible with
  # the stager's
  if ((stage_inst) and (stage_inst.compatible?(stager_inst) == false))
    dlog("Stager #{stager_name} and stage #{stage_name} are incompatible.", 'core', LEV_2)
    return false
  end

  # No intersection between platforms on the payloads?
  if ((stager_platform) and
    (stage_platform) and
    (stager_platform & stage_platform).empty?)
    dlog("Stager #{stager_name} and stage #{stage_name} have incompatible platforms: #{stager_platform.names} - #{stage_platform.names}", 'core', LEV_2)
    return false
  end

  # No intersection between architectures on the payloads?
  if ((stager_arch) and
    (stage_arch) and
    ((stager_arch & stage_arch).empty?))
    dlog("Stager #{stager_name} and stage #{stage_name} have incompatible architectures: #{stager_arch.join} - #{stage_arch.join}", 'core', LEV_2)
    return false
  end

  # If the stage has a convention, make sure it's compatible with
  # the stager's
  if ((stage_inst) and (stage_inst.compatible?(stager_inst) == false))
    dlog("Stager #{stager_name} and stage #{stage_name} are incompatible.", 'core', LEV_2)
    return false
  end
  true
end

#stager_dependencies_available?(stager_name:, stager_dependencies:) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/msf/core/payload_set.rb', line 165

def stager_dependencies_available?(stager_name:, stager_dependencies:)
  # Pass if the stager has a dependency
  # and doesn't have the dependency installed
  supported = true # Default to true for stagers with no dependencies
  unless stager_dependencies.empty?
    supported = stager_dependencies.all?(&:available?)
    elog("Dependency for #{stager_name} is not supported") unless supported
  end
  supported
end

#stagers ⇒ Object

Returns the hash of payload stagers that have been loaded.



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# File 'lib/msf/core/payload_set.rb', line 562

def stagers
  _stagers
end