143 lines
4.0 KiB
Python
143 lines
4.0 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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#
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# Copyright 2013 The Plaso Project Authors.
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# Please see the AUTHORS file for details on individual authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Interface and plugins for caching of Windows Registry objects."""
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import abc
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from plaso.lib import errors
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from plaso.lib import registry
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class WinRegistryCache(object):
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"""Class that implements the Windows Registry objects cache.
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There are some values that are valid for the duration of an entire run
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against an image, such as code_page, etc.
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However there are other values that should only be valid for each
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Windows Registry file, such as a current_control_set. The Windows Registry
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objects cache is designed to store those short lived cache values, so they
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can be calculated once for each Windows Registry file, yet do not live
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across all files parsed within an image.
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"""
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def __init__(self):
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"""Initialize the cache object."""
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super(WinRegistryCache, self).__init__()
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self.attributes = {}
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def BuildCache(self, hive, reg_type):
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"""Builds up the cache.
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Args:
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hive: The WinRegistry object.
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reg_type: The Registry type, eg. "SYSTEM", "NTUSER".
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"""
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for _, cl in WinRegCachePlugin.classes.items():
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try:
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plugin = cl(reg_type)
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value = plugin.Process(hive)
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if value:
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self.attributes[plugin.ATTRIBUTE] = value
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except errors.WrongPlugin:
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pass
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class WinRegCachePlugin(object):
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"""Class that implement the Window Registry cache plugin interface."""
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__metaclass__ = registry.MetaclassRegistry
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__abstract = True
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# Define the needed attributes.
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ATTRIBUTE = ''
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REG_TYPE = ''
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REG_KEY = ''
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def __init__(self, reg_type):
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"""Initialize the plugin.
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Args:
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reg_type: The detected Windows Registry type. This value should match
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the REG_TYPE value defined by the plugins.
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"""
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super(WinRegCachePlugin, self).__init__()
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if self.REG_TYPE.lower() != reg_type.lower():
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raise errors.WrongPlugin(u'Not the correct Windows Registry type.')
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def Process(self, hive):
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"""Extract the correct key and get the value.
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Args:
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hive: The Windows Registry hive object (instance of WinRegistry).
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"""
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if not self.REG_KEY:
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return
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key = hive.GetKeyByPath(self.REG_KEY)
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if not key:
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return
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return self.GetValue(key)
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@abc.abstractmethod
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def GetValue(self, key):
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"""Extract the attribute from the provided key."""
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class CurrentControl(WinRegCachePlugin):
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"""Fetch information about the current control set."""
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ATTRIBUTE = 'current_control_set'
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REG_TYPE = 'SYSTEM'
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REG_KEY = '\\Select'
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def GetValue(self, key):
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"""Extract current control set information."""
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value = key.GetValue('Current')
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if not value and not value.DataIsInteger():
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return None
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key_number = value.data
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# If the value is Zero then we need to check
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# other keys.
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# The default behavior is:
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# 1. Use the "Current" value.
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# 2. Use the "Default" value.
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# 3. Use the "LastKnownGood" value.
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if key_number == 0:
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default_value = key.GetValue('Default')
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lastgood_value = key.GetValue('LastKnownGood')
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if default_value and default_value.DataIsInteger():
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key_number = default_value.data
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if not key_number:
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if lastgood_value and lastgood_value.DataIsInteger():
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key_number = lastgood_value.data
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if key_number <= 0 or key_number > 999:
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return None
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return u'ControlSet{0:03d}'.format(key_number)
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