mirror of
https://github.com/overcuriousity/autopsy-flatpak.git
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462 lines
21 KiB
Python
462 lines
21 KiB
Python
"""
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Autopsy Forensic Browser
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Copyright 2019 Basis Technology Corp.
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Contact: carrier <at> sleuthkit <dot> org
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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"""
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from java.io import File
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from java.lang import Class
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from java.lang import ClassNotFoundException
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from java.lang import Long
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from java.lang import String
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from java.sql import ResultSet
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from java.sql import SQLException
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from java.sql import Statement
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from java.util.logging import Level
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from java.util import ArrayList
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from org.apache.commons.codec.binary import Base64
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from org.sleuthkit.autopsy.casemodule import Case
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from org.sleuthkit.autopsy.coreutils import Logger
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from org.sleuthkit.autopsy.coreutils import MessageNotifyUtil
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from org.sleuthkit.autopsy.coreutils import AppSQLiteDB
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from org.sleuthkit.autopsy.datamodel import ContentUtils
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from org.sleuthkit.autopsy.ingest import IngestJobContext
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from org.sleuthkit.datamodel import AbstractFile
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from org.sleuthkit.datamodel import BlackboardArtifact
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from org.sleuthkit.datamodel import BlackboardAttribute
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from org.sleuthkit.datamodel import Content
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from org.sleuthkit.datamodel import TskCoreException
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from org.sleuthkit.datamodel.Blackboard import BlackboardException
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from org.sleuthkit.autopsy.casemodule import NoCurrentCaseException
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from org.sleuthkit.datamodel import Account
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from org.sleuthkit.datamodel.blackboardutils import CommunicationArtifactsHelper
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from org.sleuthkit.datamodel.blackboardutils.CommunicationArtifactsHelper import MessageReadStatus
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from org.sleuthkit.datamodel.blackboardutils.CommunicationArtifactsHelper import CommunicationDirection
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from TskMessagesParser import TskMessagesParser
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from TskContactsParser import TskContactsParser
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from TskCallLogsParser import TskCallLogsParser
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import traceback
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import general
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class SkypeAnalyzer(general.AndroidComponentAnalyzer):
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"""
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Parses the Skype App databases for TSK contacts, message
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and calllog artifacts.
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About version 8.15.0.428 (9/17/2019) Skype database:
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- There are 4 tables this parser uses:
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1) person - this table appears to hold all contacts known to the user.
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2) user - this table holds information pertaining to the user.
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3) particiapnt - Yes, that is not a typo. This table maps group chat
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ids to skype ids (1 to many).
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4) chatItem - This table contains all messages. It maps the group id or
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skype id (for 1 to 1 communication) to the message content
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and metadata. Either the group id or skype id is stored in
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a column named 'conversation_link'.
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More info and implementation details:
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- The person table does not include groups. To get
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all 1 to 1 communications, we could simply join the person and chatItem tables.
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This would mean we'd need to do a second pass to get all the group information
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as they would be excluded in the join. Since the chatItem table stores both the
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group id or skype_id in one column, an implementation decision was made to union
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the person and particiapnt table together so that all rows are matched in one join
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with chatItem. This result is consistently labeled contact_list_with_groups in the
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following queries.
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- In order to keep the formatting of the name consistent throughout each query,
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a _format_user_name() function was created to encapsulate the CASE statement
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that was being shared across them. Refer to the method for more details.
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"""
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def __init__(self):
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self._logger = Logger.getLogger(self.__class__.__name__)
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self._SKYPE_PACKAGE_NAME = "com.skype.raider"
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self._PARSER_NAME = "Skype Parser"
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self._VERSION = "8.15.0.428"
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def get_user_account(self, skype_db):
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account_query_result = skype_db.runQuery(
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"""
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SELECT entry_id,
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"""+_format_user_name()+""" AS name
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FROM user
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"""
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)
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if account_query_result is not None and account_query_result.next():
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return Account.Address(account_query_result.getString("entry_id"),
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account_query_result.getString("name"))
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return None
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def analyze(self, dataSource, fileManager, context):
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#Skype databases are of the form: live:XYZ.db, where
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#XYZ is the skype id of the user. The following search
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#does a generic substring match for 'live' in the skype
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#package.
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skype_dbs = AppSQLiteDB.findAppDatabases(dataSource,
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"live:", False, self._SKYPE_PACKAGE_NAME)
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for skype_db in skype_dbs:
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try:
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#Attempt to get the user account id from the database
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user_account_instance = None
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try:
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user_account_instance = self.get_user_account(skype_db)
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except SQLException as ex:
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self._logger.log(Level.WARNING,
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"Error query for the user account in the Skype db.", ex)
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self._logger.log(Level.WARNING, traceback.format_exc())
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current_case = Case.getCurrentCaseThrows()
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if user_account_instance is None:
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helper = CommunicationArtifactsHelper(
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current_case.getSleuthkitCase(), self._PARSER_NAME,
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skype_db.getDBFile(), Account.Type.SKYPE
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)
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else:
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helper = CommunicationArtifactsHelper(
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current_case.getSleuthkitCase(), self._PARSER_NAME,
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skype_db.getDBFile(), Account.Type.SKYPE,
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Account.Type.SKYPE, user_account_instance
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)
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#Query for contacts and iterate row by row adding
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#each contact artifact
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contacts_parser = SkypeContactsParser(skype_db)
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while contacts_parser.next():
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helper.addContact(
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contacts_parser.get_account_name(),
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contacts_parser.get_contact_name(),
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contacts_parser.get_phone(),
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contacts_parser.get_home_phone(),
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contacts_parser.get_mobile_phone(),
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contacts_parser.get_email()
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)
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contacts_parser.close()
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#Query for call logs and iterate row by row adding
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#each call log artifact
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calllog_parser = SkypeCallLogsParser(skype_db)
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while calllog_parser.next():
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helper.addCalllog(
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calllog_parser.get_call_direction(),
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calllog_parser.get_phone_number_from(),
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calllog_parser.get_phone_number_to(),
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calllog_parser.get_call_start_date_time(),
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calllog_parser.get_call_end_date_time(),
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calllog_parser.get_call_type()
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)
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calllog_parser.close()
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#Query for messages and iterate row by row adding
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#each message artifact
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messages_parser = SkypeMessagesParser(skype_db)
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while messages_parser.next():
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helper.addMessage(
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messages_parser.get_message_type(),
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messages_parser.get_message_direction(),
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messages_parser.get_phone_number_from(),
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messages_parser.get_phone_number_to(),
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messages_parser.get_message_date_time(),
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messages_parser.get_message_read_status(),
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messages_parser.get_message_subject(),
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messages_parser.get_message_text(),
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messages_parser.get_thread_id()
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)
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messages_parser.close()
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except SQLException as ex:
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#Error parsing Skype db
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self._logger.log(Level.WARNING, "Error parsing Skype Databases", ex)
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self._logger.log(Level.WARNING, traceback.format_exc())
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except (TskCoreException, BlackboardException) as ex:
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#Severe error trying to add to case database.. case is not complete.
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#These exceptions are thrown by the CommunicationArtifactsHelper.
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self._logger.log(Level.SEVERE,
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"Failed to add message artifacts to the case database.", ex)
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self._logger.log(Level.SEVERE, traceback.format_exc())
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except NoCurrentCaseException as ex:
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self._logger.log(Level.WARNING, "No case currently open.", ex)
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self._logger.log(Level.WARNING, traceback.format_exc())
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finally:
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skype_db.close()
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class SkypeCallLogsParser(TskCallLogsParser):
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"""
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Extracts TSK_CALLLOG information from the Skype database.
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TSK_CALLLOG fields that are not in the Skype database are given
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a default value inherited from the super class.
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"""
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def __init__(self, calllog_db):
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"""
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Big picture:
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The query below creates a contacts_list_with_groups table, which
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represents the recipient info. A chatItem record holds ids for
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both the recipient and sender. The first join onto chatItem fills
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in the blanks for the recipients. The second join back onto person
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handles the sender info. The result is a table with all of the
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communication details.
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Implementation details:
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- message_type w/ value 3 appeared to be the call type, regardless
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of if it was audio or video.
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"""
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super(SkypeCallLogsParser, self).__init__(calllog_db.runQuery(
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"""
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SELECT contacts_list_with_groups.conversation_id,
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contacts_list_with_groups.participant_ids,
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contacts_list_with_groups.participants,
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time,
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duration,
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is_sender_me,
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person_id as sender_id,
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sender_name.name as sender_name
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FROM (SELECT conversation_id,
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Group_concat(person_id) AS participant_ids,
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Group_concat("""+_format_user_name()+""") AS participants
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FROM particiapnt AS PART
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JOIN person AS P
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ON PART.person_id = P.entry_id
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GROUP BY conversation_id
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UNION
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SELECT entry_id,
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NULL,
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"""+_format_user_name()+""" AS participant
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FROM person) AS contacts_list_with_groups
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JOIN chatitem AS C
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ON C.conversation_link = contacts_list_with_groups.conversation_id
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JOIN (SELECT entry_id as id,
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"""+_format_user_name()+""" AS name
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FROM person
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UNION
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SELECT entry_id as id,
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"""+_format_user_name()+""" AS name
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FROM user) AS sender_name
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ON sender_name.id = C.person_id
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WHERE message_type == 3
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"""
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)
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)
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self._INCOMING_CALL_TYPE = 0
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self._OUTGOING_CALL_TYPE = 1
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def get_phone_number_from(self):
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if self.get_call_direction() == self.INCOMING_CALL:
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return Account.Address(self.result_set.getString("sender_id"),
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self.result_set.getString("sender_name"))
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def get_phone_number_to(self):
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if self.get_call_direction() == self.OUTGOING_CALL:
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group_ids = self.result_set.getString("participant_ids")
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name = self.result_set.getString("participants")
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if group_ids is not None:
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group_ids = group_ids.split(",")
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name = name.split(",")
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recipients = []
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for person_id, person_name in zip(group_ids, name):
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recipients.append(Account.Address(person_id, person_name))
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return recipients
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return Account.Address(self.result_set.getString("conversation_id"), name)
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return super(SkypeCallLogsParser, self).get_phone_number_to()
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def get_call_direction(self):
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direction = self.result_set.getInt("is_sender_me")
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if direction == self._INCOMING_CALL_TYPE:
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return self.INCOMING_CALL
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if direction == self._OUTGOING_CALL_TYPE:
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return self.OUTGOING_CALL
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return super(SkypeCallLogsParser, self).get_call_direction()
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def get_call_start_date_time(self):
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return self.result_set.getLong("time") / 1000
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def get_call_end_date_time(self):
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start = self.get_call_start_date_time()
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duration = self.result_set.getInt("duration") / 1000
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return start + duration
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class SkypeContactsParser(TskContactsParser):
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"""
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Extracts TSK_CONTACT information from the Skype database.
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TSK_CONTACT fields that are not in the Skype database are given
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a default value inherited from the super class.
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"""
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def __init__(self, contact_db):
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super(SkypeContactsParser, self).__init__(contact_db.runQuery(
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"""
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SELECT entry_id,
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"""+_format_user_name()+""" AS name
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FROM person
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"""
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)
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)
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def get_account_name(self):
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return self.result_set.getString("entry_id")
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def get_contact_name(self):
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return self.result_set.getString("name")
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class SkypeMessagesParser(TskMessagesParser):
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"""
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Extract TSK_MESSAGE information from the Skype database.
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TSK_CONTACT fields that are not in the Skype database are given
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a default value inherited from the super class.
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"""
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def __init__(self, message_db):
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"""
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This query is very similar to the call logs query, the only difference is
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it grabs more columns in the SELECT and excludes message_types which have
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the call type value (3).
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"""
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super(SkypeMessagesParser, self).__init__(message_db.runQuery(
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"""
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SELECT contacts_list_with_groups.conversation_id,
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contacts_list_with_groups.participant_ids,
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contacts_list_with_groups.participants,
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time,
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content,
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file_name,
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device_gallery_path,
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is_sender_me,
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person_id as sender_id,
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sender_name.name AS sender_name
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FROM (SELECT conversation_id,
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Group_concat(person_id) AS participant_ids,
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Group_concat("""+_format_user_name()+""") AS participants
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FROM particiapnt AS PART
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JOIN person AS P
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ON PART.person_id = P.entry_id
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GROUP BY conversation_id
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UNION
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SELECT entry_id as conversation_id,
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NULL,
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"""+_format_user_name()+""" AS participant
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FROM person) AS contacts_list_with_groups
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JOIN chatitem AS C
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ON C.conversation_link = contacts_list_with_groups.conversation_id
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JOIN (SELECT entry_id as id,
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"""+_format_user_name()+""" AS name
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FROM person
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UNION
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SELECT entry_id as id,
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"""+_format_user_name()+""" AS name
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FROM user) AS sender_name
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ON sender_name.id = C.person_id
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WHERE message_type != 3
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"""
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)
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)
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self._SKYPE_MESSAGE_TYPE = "Skype Message"
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self._OUTGOING_MESSAGE_TYPE = 1
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self._INCOMING_MESSAGE_TYPE = 0
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def get_message_type(self):
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return self._SKYPE_MESSAGE_TYPE
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def get_phone_number_from(self):
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if self.get_message_direction() == self.INCOMING:
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return Account.Address(self.result_set.getString("sender_id"),
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self.result_set.getString("sender_name"))
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return super(SkypeMessagesParser, self).get_phone_number_from()
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def get_message_direction(self):
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direction = self.result_set.getInt("is_sender_me")
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if direction == self._OUTGOING_MESSAGE_TYPE:
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return self.OUTGOING
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if direction == self._INCOMING_MESSAGE_TYPE:
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return self.INCOMING
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return super(SkypeMessagesParser, self).get_message_direction()
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def get_phone_number_to(self):
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if self.get_message_direction() == self.OUTGOING:
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group_ids = self.result_set.getString("participant_ids")
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names = self.result_set.getString("participants")
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if group_ids is not None:
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group_ids = group_ids.split(",")
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names = names.split(",")
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recipients = []
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for participant_id, participant_name in zip(group_ids, names):
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recipients.append(Account.Address(participant_id, participant_name))
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return recipients
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return Account.Address(self.result_set.getString("conversation_id"), names)
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return super(SkypeMessagesParser, self).get_phone_number_to()
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def get_message_date_time(self):
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date = self.result_set.getLong("time")
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return date / 1000
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def get_message_text(self):
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content = self.result_set.getString("content")
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if content is not None:
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file_name = self.result_set.getString("file_name")
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file_path = self.result_set.getString("device_gallery_path")
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#if a file name and file path are associated with a message, append it
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if file_name is not None and file_path is not None:
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attachment = "File Name: "+file_name +"\n"+ "File Path: "+file_path
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return general.appendAttachmentList(content, [attachment])
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return content
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return super(SkypeMessagesParser, self).get_message_text()
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def get_thread_id(self):
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group_ids = self.result_set.getString("participant_ids")
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if group_ids is not None:
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return self.result_set.getString("conversation_id")
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return super(SkypeMessagesParser, self).get_thread_id()
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def _format_user_name():
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"""
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This CASE SQL statement is used in many queries to
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format the names of users. For a user, there is a first_name
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column and a last_name column. Some of these columns can be null
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and our goal is to produce the cleanest data possible. In the event
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that both the first and last name columns are null, we return the skype_id
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which is stored in the database as 'entry_id'. Commas are removed from the name
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so that we can concatenate names into a comma seperate list for group chats.
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"""
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return """
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CASE
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WHEN Ifnull(first_name, "") == "" AND Ifnull(last_name, "") == "" THEN entry_id
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WHEN first_name is NULL THEN replace(last_name, ",", "")
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WHEN last_name is NULL THEN replace(first_name, ",", "")
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ELSE replace(first_name, ",", "") || " " || replace(last_name, ",", "")
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END
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"""
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