volatility3.framework.automagic.stacker module

This module attempts to automatically stack layers.

This automagic module fulfills TranslationLayerRequirement that are not already fulfilled, by attempting to stack as many layers on top of each other as possible. The base/lowest layer is derived from the “automagic.general.single_location” configuration path. Layers are then attempting in likely height order, and once a layer successfully stacks on top of the existing layers, it is removed from the possible choices list (so no layer type can exist twice in the layer stack).

class LayerStacker(*args, **kwargs)[source]

Bases: AutomagicInterface

Builds up layers in a single stack.

This class mimics the volatility 2 style of stacking address spaces. It builds up various layers based on separate StackerLayerInterface classes. These classes are built up based on a stack_order class variable each has.

This has a high priority to provide other automagic modules as complete a context/configuration tree as possible. Upon completion it will re-call the ConstructionMagic, so that any stacked layers are actually constructed and added to the context.

Basic initializer that allows configurables to access their own config settings.

build_configuration()

Constructs a HierarchicalDictionary of all the options required to build this component in the current context.

Ensures that if the class has been created, it can be recreated using the configuration built Inheriting classes must override this to ensure any dependent classes update their configurations too

Return type:

HierarchicalDict

property config: HierarchicalDict

The Hierarchical configuration Dictionary for this Configurable object.

property config_path: str

The configuration path on which this configurable lives.

property context: ContextInterface

The context object that this configurable belongs to/configuration is stored in.

create_stackers_list()[source]

Creates the list of stackers to use based on the config option

Return type:

List[Type[StackerLayerInterface]]

exclusion_list = []

A list of plugin categories (typically operating systems) which the plugin will not operate on

find_requirements(context, config_path, requirement_root, requirement_type, shortcut=True)

Determines if there is actually an unfulfilled Requirement waiting.

This ensures we do not carry out an expensive search when there is no need for a particular Requirement

Parameters:
Return type:

List[Tuple[str, RequirementInterface]]

Returns:

A list of tuples containing the config_path, sub_config_path and requirement identifying the unsatisfied Requirements

classmethod find_suitable_requirements(context, config_path, requirement, stacked_layers)[source]

Looks for translation layer requirements and attempts to apply the stacked layers to it. If it succeeds it returns the configuration path and layer name where the stacked nodes were spliced into the tree.

Return type:

Optional[Tuple[str, str]]

Returns:

A tuple of a configuration path and layer name for the top of the stacked layers

or None if suitable requirements are not found

classmethod get_requirements()[source]

Returns a list of RequirementInterface objects required by this object.

Return type:

List[RequirementInterface]

classmethod make_subconfig(context, base_config_path, **kwargs)

Convenience function to allow constructing a new randomly generated sub-configuration path, containing each element from kwargs.

Parameters:

  • context (ContextInterface) – The context in which to store the new configuration

  • base_config_path (str) – The base configuration path on which to build the new configuration

  • kwargs – Keyword arguments that are used to populate the new configuration path

Returns:

The newly generated full configuration path

Return type:

str

priority = 10

An ordering to indicate how soon this automagic should be run

stack(context, config_path, requirement, progress_callback)[source]

Stacks the various layers and attaches these to a specific requirement.

Parameters:
Return type:

None

classmethod stack_layer(context, initial_layer, stack_set=None, progress_callback=None)[source]

Stacks as many possible layers on top of the initial layer as can be done.

WARNING: This modifies the context provided and may pollute it with unnecessary layers Recommended use is to: 1. Pass in context.clone() instead of context 2. When provided the layer list, choose the desired layer 3. Build the configuration using layer.build_configuration() 4. Merge the configuration into the original context with context.config.merge() 5. Call Construction magic to reconstruct the layers from just the configuration

Parameters:
Returns:

A list of layer names that exist in the provided context, stacked in order (highest to lowest)

classmethod unsatisfied(context, config_path)

Returns a list of the names of all unsatisfied requirements.

Since a satisfied set of requirements will return [], it can be used in tests as follows:

unmet = configurable.unsatisfied(context, config_path)
if unmet:
    raise RuntimeError("Unsatisfied requirements: {}".format(unmet)
Return type:

Dict[str, RequirementInterface]

choose_os_stackers(plugin)[source]

Identifies the stackers that should be run, based on the plugin (and thus os) provided

Return type:

List[str]