# -*- coding: utf-8 -*-
"""Text parser plugin for iOS lockdown daemon log files (ios_lockdownd.log)."""
import pyparsing
from dfdatetime import time_elements as dfdatetime_time_elements
from plaso.containers import events
from plaso.lib import errors
from plaso.parsers import text_parser
from plaso.parsers.text_plugins import interface
[docs]class IOSLockdowndLogData(events.EventData):
"""iOS lockdown daemon (lockdownd) log event data.
Attributes:
body (str): body of the log entry.
process_identifier (int): identifier of the process making the request to
lockdownd.
written_time (dfdatetime.DateTimeValues): date and time the log entry was
written.
"""
DATA_TYPE = 'ios:lockdownd_log:entry'
def __init__(self):
"""Initializes event data."""
super(IOSLockdowndLogData, self).__init__(data_type=self.DATA_TYPE)
self.body = None
self.process_identifier = None
self.written_time = None
[docs]class IOSLockdowndLogTextPlugin(interface.TextPluginWithLineContinuation):
"""Text parser plugin for iOS lockdown daemon log files."""
NAME = 'ios_lockdownd'
DATA_FORMAT = 'iOS lockdown daemon log'
_INTEGER = pyparsing.Word(pyparsing.nums).setParseAction(
lambda tokens: int(tokens[0], 10))
_TWO_DIGITS = pyparsing.Word(pyparsing.nums, exact=2).setParseAction(
lambda tokens: int(tokens[0], 10))
_SIX_DIGITS = pyparsing.Word(pyparsing.nums, exact=6).setParseAction(
lambda tokens: int(tokens[0], 10))
_END_OF_LINE = pyparsing.Suppress(pyparsing.LineEnd())
# Date and time values are formatted as: MM/DD/YY hh:mm:ss:######
# For example: 10/13/21 07:57:42.865446
_DATE_TIME = (
_TWO_DIGITS + pyparsing.Suppress('/') +
_TWO_DIGITS + pyparsing.Suppress('/') + _TWO_DIGITS +
_TWO_DIGITS + pyparsing.Suppress(':') +
_TWO_DIGITS + pyparsing.Suppress(':') + _TWO_DIGITS +
pyparsing.Word('.,', exact=1).suppress() + _SIX_DIGITS)
_LOG_LINE_START = (
_DATE_TIME.setResultsName('date_time') +
pyparsing.Suppress('pid=') +
_INTEGER.setResultsName('process_identifier'))
_LOG_LINE = (
_LOG_LINE_START + pyparsing.restOfLine().setResultsName('body') +
_END_OF_LINE)
_LINE_STRUCTURES = [('log_line', _LOG_LINE)]
VERIFICATION_GRAMMAR = _LOG_LINE
def __init__(self):
"""Initializes a text parser plugin."""
super(IOSLockdowndLogTextPlugin, self).__init__()
self._body_lines = None
self._event_data = None
def _ParseFinalize(self, parser_mediator):
"""Finalizes parsing.
Args:
parser_mediator (ParserMediator): mediates interactions between parsers
and other components, such as storage and dfVFS.
"""
if self._event_data:
self._event_data.body = ' '.join(self._body_lines)
self._body_lines = None
parser_mediator.ProduceEventData(self._event_data)
self._event_data = None
def _ParseLogline(self, structure):
"""Parses a log line.
Args:
structure (pyparsing.ParseResults): structure of tokens derived from
a line of a text file.
"""
time_elements_structure = self._GetValueFromStructure(
structure, 'date_time')
body = self._GetValueFromStructure(structure, 'body', default_value='')
event_data = IOSLockdowndLogData()
event_data.process_identifier = self._GetValueFromStructure(
structure, 'process_identifier')
event_data.written_time = self._ParseTimeElements(time_elements_structure)
self._event_data = event_data
self._body_lines = [body.strip()]
def _ParseRecord(self, parser_mediator, key, structure):
"""Parses a pyparsing structure.
Args:
parser_mediator (ParserMediator): mediates interactions between parsers
and other components, such as storage and dfVFS.
key (str): name of the parsed structure.
structure (pyparsing.ParseResults): tokens from a parsed log line.
Raises:
ParseError: if the structure cannot be parsed.
"""
if key == '_line_continuation':
body = structure.replace('\n', ' ').strip()
self._body_lines.append(body)
else:
if self._event_data:
self._event_data.body = ' '.join(self._body_lines)
parser_mediator.ProduceEventData(self._event_data)
self._ParseLogline(structure)
def _ParseTimeElements(self, time_elements_structure):
"""Parses date and time elements of a log line.
Args:
time_elements_structure (pyparsing.ParseResults): date and time elements
of a log line.
Returns:
dfdatetime.TimeElements: date and time value.
Raises:
ParseError: if a valid date and time value cannot be derived from
the time elements.
"""
try:
month, day_of_month, year, hours, minutes, seconds, microseconds = (
time_elements_structure)
time_elements_tuple = (
2000 + year, month, day_of_month, hours, minutes, seconds,
microseconds)
return dfdatetime_time_elements.TimeElementsInMicroseconds(
time_elements_tuple=time_elements_tuple)
except (TypeError, ValueError) as exception:
raise errors.ParseError(
'Unable to parse time elements with error: {0!s}'.format(exception))
def _ResetState(self):
"""Resets stored values."""
self._body_lines = None
self._event_data = None
[docs] def CheckRequiredFormat(self, parser_mediator, text_reader):
"""Check if the log record has the minimal structure required by the parser.
Args:
parser_mediator (ParserMediator): mediates interactions between parsers
and other components, such as storage and dfVFS.
text_reader (EncodedTextReader): text reader.
Returns:
bool: True if this is the correct parser, False otherwise.
"""
try:
structure = self._VerifyString(text_reader.lines)
except errors.ParseError:
return False
time_elements_structure = self._GetValueFromStructure(
structure, 'date_time')
try:
self._ParseTimeElements(time_elements_structure)
except errors.ParseError:
return False
self._ResetState()
return True
text_parser.TextLogParser.RegisterPlugin(IOSLockdowndLogTextPlugin)