mirror of https://github.com/CIRCL/lookyloo
536 lines
23 KiB
Python
536 lines
23 KiB
Python
#!/usr/bin/env python3
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import contextlib
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import json
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import logging
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import os
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import pickle
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import signal
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import sys
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import time
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from collections.abc import Mapping
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from datetime import datetime
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from functools import lru_cache
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from pathlib import Path
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from typing import Any, Dict, List, Optional, Tuple, Union, Set
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import dns.rdatatype
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import dns.resolver
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from har2tree import CrawledTree, Har2TreeError, HarFile
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from pyipasnhistory import IPASNHistory
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from redis import Redis
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from .context import Context
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from .helpers import get_captures_dir
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from .indexing import Indexing
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from .default import LookylooException, try_make_file, get_config
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from .exceptions import MissingCaptureDirectory, NoValidHarFile, MissingUUID, TreeNeedsRebuild
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from .modules import Cloudflare
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class CaptureCache():
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__slots__ = ('uuid', 'title', 'timestamp', 'url', 'redirects', 'capture_dir',
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'error', 'incomplete_redirects', 'no_index', 'categories', 'parent',
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'user_agent', 'referer', 'logger')
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def __init__(self, cache_entry: Dict[str, Any]):
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self.logger = logging.getLogger(f'{self.__class__.__name__}')
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self.logger.setLevel(get_config('generic', 'loglevel'))
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__default_cache_keys: Tuple[str, str, str, str, str, str] = ('uuid', 'title', 'timestamp',
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'url', 'redirects', 'capture_dir')
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if 'uuid' not in cache_entry or 'capture_dir' not in cache_entry:
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raise LookylooException(f'The capture is deeply broken: {cache_entry}')
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self.uuid: str = cache_entry['uuid']
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self.capture_dir: Path = Path(cache_entry['capture_dir'])
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if all(key in cache_entry.keys() for key in __default_cache_keys):
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self.title: str = cache_entry['title']
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try:
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self.timestamp: datetime = datetime.strptime(cache_entry['timestamp'], '%Y-%m-%dT%H:%M:%S.%f%z')
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except ValueError:
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# If the microsecond is missing (0), it fails
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self.timestamp = datetime.strptime(cache_entry['timestamp'], '%Y-%m-%dT%H:%M:%S%z')
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self.url: str = cache_entry['url']
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if cache_entry.get('redirects'):
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self.redirects: List[str] = json.loads(cache_entry['redirects'])
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else:
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self.logger.info(f'No redirects in cache for {self.uuid}')
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self.redirects = []
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if not self.capture_dir.exists():
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raise MissingCaptureDirectory(f'The capture {self.uuid} does not exists in {self.capture_dir}.')
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elif not cache_entry.get('error'):
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missing = set(__default_cache_keys) - set(cache_entry.keys())
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raise LookylooException(f'Missing keys ({missing}), no error message. It should not happen.')
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# Error without all the keys in __default_cache_keys was fatal.
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# if the keys in __default_cache_keys are present, it was an HTTP error
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self.error: Optional[str] = cache_entry.get('error')
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self.incomplete_redirects: bool = True if cache_entry.get('incomplete_redirects') in [1, '1'] else False
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self.no_index: bool = True if cache_entry.get('no_index') in [1, '1'] else False
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self.categories: List[str] = json.loads(cache_entry['categories']) if cache_entry.get('categories') else []
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self.parent: Optional[str] = cache_entry.get('parent')
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self.user_agent: Optional[str] = cache_entry.get('user_agent')
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self.referer: Optional[str] = cache_entry.get('referer')
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@property
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def tree(self) -> CrawledTree:
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return load_pickle_tree(self.capture_dir, self.capture_dir.stat().st_mtime)
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def remove_pickle_tree(capture_dir: Path) -> None:
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pickle_file = capture_dir / 'tree.pickle'
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if pickle_file.exists():
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pickle_file.unlink()
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@lru_cache(maxsize=256)
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def load_pickle_tree(capture_dir: Path, last_mod_time: int) -> CrawledTree:
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pickle_file = capture_dir / 'tree.pickle'
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if pickle_file.exists():
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with pickle_file.open('rb') as _p:
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try:
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tree = pickle.load(_p)
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if tree.root_hartree.har.path.exists():
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return tree
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else:
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# The capture was moved.
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remove_pickle_tree(capture_dir)
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except pickle.UnpicklingError:
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remove_pickle_tree(capture_dir)
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except EOFError:
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remove_pickle_tree(capture_dir)
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except Exception:
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remove_pickle_tree(capture_dir)
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if list(capture_dir.rglob('*.har')) or list(capture_dir.rglob('*.har.gz')):
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raise TreeNeedsRebuild('We have HAR files and need to rebuild the tree.')
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# The tree doesn't need to be rebuilt if there are no HAR files.
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raise NoValidHarFile("Couldn't find HAR files")
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def serialize_sets(obj):
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if isinstance(obj, set):
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return list(obj)
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return obj
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class CapturesIndex(Mapping):
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def __init__(self, redis: Redis, contextualizer: Optional[Context]=None):
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self.logger = logging.getLogger(f'{self.__class__.__name__}')
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self.logger.setLevel(get_config('generic', 'loglevel'))
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self.redis = redis
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self.indexing = Indexing()
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self.contextualizer = contextualizer
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self.__cache: Dict[str, CaptureCache] = {}
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self._quick_init()
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self.timeout = get_config('generic', 'max_tree_create_time')
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try:
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self.ipasnhistory: Optional[IPASNHistory] = IPASNHistory()
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if not self.ipasnhistory.is_up:
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self.ipasnhistory = None
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except Exception as e:
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# Unable to setup IPASN History
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self.logger.warning(f'Unable to setup IPASN History: {e}')
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self.ipasnhistory = None
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try:
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self.cloudflare: Optional[Cloudflare] = Cloudflare()
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if not self.cloudflare.available:
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self.cloudflare = None
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except Exception as e:
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self.logger.warning(f'Unable to setup Cloudflare: {e}')
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self.cloudflare = None
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@property
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def cached_captures(self) -> Set[str]:
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return set(self.__cache.keys())
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def __getitem__(self, uuid: str) -> CaptureCache:
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if uuid in self.__cache:
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if (self.__cache[uuid].capture_dir.exists()
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and not self.__cache[uuid].incomplete_redirects):
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return self.__cache[uuid]
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del self.__cache[uuid]
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capture_dir = self._get_capture_dir(uuid)
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cached = self.redis.hgetall(capture_dir)
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if cached:
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cc = CaptureCache(cached)
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# NOTE: checking for pickle to exist may be a bad idea here.
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if (cc.capture_dir.exists()
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and (cc.capture_dir / 'tree.pickle').exists()
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and not cc.incomplete_redirects):
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self.__cache[uuid] = cc
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return self.__cache[uuid]
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self.__cache[uuid] = self._set_capture_cache(capture_dir)
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return self.__cache[uuid]
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def __iter__(self):
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return iter(self.__cache)
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def __len__(self):
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return len(self.__cache)
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def reload_cache(self, uuid: str) -> None:
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if uuid in self.__cache:
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self.redis.delete(str(self.__cache[uuid].capture_dir))
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del self.__cache[uuid]
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def remove_pickle(self, uuid: str) -> None:
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if uuid in self.__cache:
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remove_pickle_tree(self.__cache[uuid].capture_dir)
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del self.__cache[uuid]
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def rebuild_all(self) -> None:
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for uuid, cache in self.__cache.items():
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remove_pickle_tree(cache.capture_dir)
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self.redis.flushdb()
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self.__cache = {}
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def lru_cache_status(self):
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return load_pickle_tree.cache_info()
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def _quick_init(self) -> None:
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'''Initialize the cache with a list of UUIDs, with less back and forth with redis.
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Only get recent captures.'''
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p = self.redis.pipeline()
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for directory in self.redis.hvals('lookup_dirs'):
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p.hgetall(directory)
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for cache in p.execute():
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if not cache:
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continue
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try:
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cc = CaptureCache(cache)
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except LookylooException as e:
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self.logger.warning(f'Unable to initialize the cache: {e}')
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continue
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self.__cache[cc.uuid] = cc
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def _get_capture_dir(self, uuid: str) -> str:
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# Try to get from the recent captures cache in redis
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capture_dir = self.redis.hget('lookup_dirs', uuid)
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if capture_dir:
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if os.path.exists(capture_dir):
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return capture_dir
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# The capture was either removed or archived, cleaning up
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self.redis.hdel('lookup_dirs', uuid)
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self.redis.delete(capture_dir)
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# Try to get from the archived captures cache in redis
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capture_dir = self.redis.hget('lookup_dirs_archived', uuid)
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if capture_dir:
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if os.path.exists(capture_dir):
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return capture_dir
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# The capture was removed, remove the UUID
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self.redis.hdel('lookup_dirs_archived', uuid)
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self.redis.delete(capture_dir)
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self.logger.warning(f'UUID ({uuid}) linked to a missing directory ({capture_dir}).')
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raise MissingCaptureDirectory(f'UUID ({uuid}) linked to a missing directory ({capture_dir}).')
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raise MissingUUID(f'Unable to find UUID {uuid}.')
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def _create_pickle(self, capture_dir: Path) -> CrawledTree:
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with (capture_dir / 'uuid').open() as f:
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uuid = f.read().strip()
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lock_file = capture_dir / 'lock'
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if try_make_file(lock_file):
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# Lock created, we can process
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with lock_file.open('w') as f:
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f.write(datetime.now().isoformat())
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else:
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# The pickle is being created somewhere else, wait until it's done.
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while lock_file.exists():
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time.sleep(5)
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return load_pickle_tree(capture_dir, capture_dir.stat().st_mtime)
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if not (har_files := sorted(capture_dir.glob('*.har'))):
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har_files = sorted(capture_dir.glob('*.har.gz'))
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try:
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with self._timeout_context():
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tree = CrawledTree(har_files, uuid)
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self.__resolve_dns(tree)
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if self.contextualizer:
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self.contextualizer.contextualize_tree(tree)
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except Har2TreeError as e:
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# unable to use the HAR files, get them out of the way
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for har_file in har_files:
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har_file.rename(har_file.with_suffix('.broken'))
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raise NoValidHarFile(f'We got har files, but they are broken: {e}')
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except TimeoutError:
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self.logger.warning(f'Unable to rebuild the tree for {capture_dir}, the tree took too long.')
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for har_file in har_files:
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har_file.rename(har_file.with_suffix('.broken'))
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raise NoValidHarFile(f'We got har files, but creating a tree took more than {self.timeout}s.')
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except RecursionError as e:
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raise NoValidHarFile(f'Tree too deep, probably a recursive refresh: {e}.\n Append /export to the URL to get the files.')
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else:
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with (capture_dir / 'tree.pickle').open('wb') as _p:
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# Some pickles require a pretty high recursion limit, this kindof fixes it.
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# If the capture is really broken (generally a refresh to self), the capture
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# is discarded in the RecursionError above.
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default_recursion_limit = sys.getrecursionlimit()
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sys.setrecursionlimit(int(default_recursion_limit * 1.1))
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try:
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pickle.dump(tree, _p)
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except RecursionError as e:
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raise NoValidHarFile(f'Tree too deep, probably a recursive refresh: {e}.\n Append /export to the URL to get the files.')
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sys.setrecursionlimit(default_recursion_limit)
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finally:
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lock_file.unlink(missing_ok=True)
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return tree
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@staticmethod
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def _raise_timeout(_, __):
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raise TimeoutError
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@contextlib.contextmanager
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def _timeout_context(self):
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if self.timeout != 0:
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# Register a function to raise a TimeoutError on the signal.
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signal.signal(signal.SIGALRM, self._raise_timeout)
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signal.alarm(self.timeout)
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try:
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yield
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except TimeoutError as e:
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raise e
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finally:
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signal.signal(signal.SIGALRM, signal.SIG_IGN)
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else:
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yield
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def _set_capture_cache(self, capture_dir_str: str) -> CaptureCache:
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'''Populate the redis cache for a capture. Mostly used on the index page.
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NOTE: Doesn't require the pickle.'''
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capture_dir = Path(capture_dir_str)
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with (capture_dir / 'uuid').open() as f:
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uuid = f.read().strip()
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try:
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tree = load_pickle_tree(capture_dir, capture_dir.stat().st_mtime)
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except NoValidHarFile:
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self.logger.debug('Unable to rebuild the tree, the HAR files are broken.')
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except TreeNeedsRebuild:
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try:
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tree = self._create_pickle(capture_dir)
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self.indexing.new_internal_uuids(tree)
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except NoValidHarFile:
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self.logger.warning(f'Unable to rebuild the tree for {capture_dir}, the HAR files are broken.')
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tree = None
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cache: Dict[str, Union[str, int]] = {'uuid': uuid, 'capture_dir': capture_dir_str}
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if (capture_dir / 'error.txt').exists():
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# Something went wrong
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with (capture_dir / 'error.txt').open() as _error:
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content = _error.read()
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try:
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error_to_cache = json.loads(content)
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if isinstance(error_to_cache, dict) and error_to_cache.get('details'):
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error_to_cache = error_to_cache.get('details')
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except json.decoder.JSONDecodeError:
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# old format
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error_to_cache = content
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cache['error'] = f'The capture {capture_dir.name} has an error: {error_to_cache}'
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if not (har_files := sorted(capture_dir.rglob('*.har'))):
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har_files = sorted(capture_dir.rglob('*.har.gz'))
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if har_files:
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try:
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har = HarFile(har_files[0], uuid)
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cache['title'] = har.initial_title
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cache['timestamp'] = har.initial_start_time
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cache['url'] = har.root_url
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cache['redirects'] = json.dumps(tree.redirects) if tree else ''
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cache['incomplete_redirects'] = 0
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cache['user_agent'] = har.root_user_agent if har.root_user_agent else 'No User Agent.'
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if har.root_referrer:
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cache['referer'] = har.root_referrer
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except Har2TreeError as e:
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cache['error'] = str(e)
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else:
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if 'error' not in cache:
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cache['error'] = f'No har files in {capture_dir.name}'
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if (cache.get('error')
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and isinstance(cache['error'], str)
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and 'HTTP Error' not in cache['error']
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and "No har files in" not in cache['error']):
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self.logger.info(cache['error'])
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if (capture_dir / 'categories').exists():
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with (capture_dir / 'categories').open() as _categories:
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cache['categories'] = json.dumps([c.strip() for c in _categories.readlines()])
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if (capture_dir / 'no_index').exists():
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# If the folders claims anonymity
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cache['no_index'] = 1
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if (capture_dir / 'parent').exists():
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# The capture was initiated from an other one
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with (capture_dir / 'parent').open() as f:
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cache['parent'] = f.read().strip()
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p = self.redis.pipeline()
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# if capture_dir.is_relative_to(get_captures_dir()): # Requires python 3.9
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if capture_dir_str.startswith(str(get_captures_dir())):
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p.hset('lookup_dirs', uuid, capture_dir_str)
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else:
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p.hset('lookup_dirs_archived', uuid, capture_dir_str)
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p.delete(capture_dir_str)
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p.hset(capture_dir_str, mapping=cache) # type: ignore
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p.execute()
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return CaptureCache(cache)
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def __resolve_dns(self, ct: CrawledTree):
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'''Resolves all domains of the tree, keeps A (IPv4), AAAA (IPv6), and CNAME entries
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and store them in ips.json and cnames.json, in the capture directory.
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Updates the nodes of the tree accordingly so the information is available.
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'''
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def _build_cname_chain(known_cnames: Dict[str, str], hostname) -> List[str]:
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'''Returns a list of CNAMEs starting from one hostname.
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The CNAMEs resolutions are made in `_resolve_dns`. A hostname can have a CNAME entry
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and the CNAME entry can have an other CNAME entry, and so on multiple times.
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This method loops over the hostnames until there are no CNAMES.'''
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cnames: List[str] = []
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to_search = hostname
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while True:
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if not known_cnames.get(to_search):
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break
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cnames.append(known_cnames[to_search])
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to_search = known_cnames[to_search]
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return cnames
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cnames_path = ct.root_hartree.har.path.parent / 'cnames.json'
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ips_path = ct.root_hartree.har.path.parent / 'ips.json'
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ipasn_path = ct.root_hartree.har.path.parent / 'ipasn.json'
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host_cnames: Dict[str, str] = {}
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if cnames_path.exists():
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try:
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with cnames_path.open() as f:
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host_cnames = json.load(f)
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except json.decoder.JSONDecodeError:
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# The json is broken, delete and re-trigger the requests
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host_cnames = {}
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host_ips: Dict[str, Dict[str, Set[str]]] = {}
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if ips_path.exists():
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try:
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with ips_path.open() as f:
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host_ips = json.load(f)
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except json.decoder.JSONDecodeError:
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# The json is broken, delete and re-trigger the requests
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host_ips = {}
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ipasn: Dict[str, Dict[str, str]] = {}
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if ipasn_path.exists():
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try:
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with ipasn_path.open() as f:
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ipasn = json.load(f)
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except json.decoder.JSONDecodeError:
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# The json is broken, delete and re-trigger the requests
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ipasn = {}
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_all_ips = set()
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for node in ct.root_hartree.hostname_tree.traverse():
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if node.name not in host_cnames or node.name not in host_ips:
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host_cnames[node.name] = ''
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host_ips[node.name] = {'v4': set(), 'v6': set()}
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# Resolve and cache
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for query_type in [dns.rdatatype.RdataType.A, dns.rdatatype.RdataType.AAAA]:
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try:
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response = dns.resolver.resolve(node.name, query_type, search=True, raise_on_no_answer=False)
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except Exception as e:
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self.logger.warning(f'Unable to resolve DNS: {e}')
|
|
continue
|
|
for answer in response.response.answer:
|
|
name_to_cache = str(answer.name).rstrip('.')
|
|
if name_to_cache not in host_ips:
|
|
host_ips[name_to_cache] = {'v4': set(), 'v6': set()}
|
|
else:
|
|
if 'v4' in host_ips[name_to_cache] and 'v6' in host_ips[name_to_cache]:
|
|
host_ips[name_to_cache]['v4'] = set(host_ips[name_to_cache]['v4'])
|
|
host_ips[name_to_cache]['v6'] = set(host_ips[name_to_cache]['v6'])
|
|
else:
|
|
# old format
|
|
old_ips = host_ips[name_to_cache]
|
|
host_ips[name_to_cache] = {'v4': set(), 'v6': set()}
|
|
for ip in old_ips:
|
|
if '.' in ip:
|
|
host_ips[name_to_cache]['v4'].add(ip)
|
|
elif ':' in ip:
|
|
host_ips[name_to_cache]['v6'].add(ip)
|
|
|
|
if answer.rdtype == dns.rdatatype.RdataType.CNAME:
|
|
host_cnames[name_to_cache] = str(answer[0].target).rstrip('.')
|
|
else:
|
|
host_cnames[name_to_cache] = ''
|
|
|
|
if answer.rdtype == dns.rdatatype.RdataType.A:
|
|
_all_ips |= {str(b) for b in answer}
|
|
host_ips[name_to_cache]['v4'] |= {str(b) for b in answer}
|
|
elif answer.rdtype == dns.rdatatype.RdataType.AAAA:
|
|
_all_ips |= {str(b) for b in answer}
|
|
host_ips[name_to_cache]['v6'] |= {str(b) for b in answer}
|
|
|
|
if (cnames := _build_cname_chain(host_cnames, node.name)):
|
|
node.add_feature('cname', cnames)
|
|
if cnames[-1] in host_ips:
|
|
node.add_feature('resolved_ips', host_ips[cnames[-1]])
|
|
elif node.name in host_ips:
|
|
node.add_feature('resolved_ips', host_ips[node.name])
|
|
|
|
cflare_hits = {}
|
|
if self.cloudflare:
|
|
cflare_hits = self.cloudflare.ips_lookup(_all_ips)
|
|
|
|
if self.ipasnhistory:
|
|
# Throw all the IPs to IPASN History for query later.
|
|
if ips := [{'ip': ip} for ip in _all_ips]:
|
|
try:
|
|
self.ipasnhistory.mass_cache(ips)
|
|
except Exception as e:
|
|
self.logger.warning(f'Unable to submit IPs to IPASNHistory: {e}')
|
|
else:
|
|
time.sleep(2)
|
|
ipasn_responses = self.ipasnhistory.mass_query(ips)
|
|
if 'responses' in ipasn_responses:
|
|
for response in ipasn_responses['responses']:
|
|
ip = response['meta']['ip']
|
|
r = list(response['response'].values())[0]
|
|
if ip not in ipasn and r:
|
|
ipasn[ip] = r
|
|
|
|
if ipasn or cflare_hits:
|
|
# retraverse tree to populate it with the features
|
|
for node in ct.root_hartree.hostname_tree.traverse():
|
|
if not hasattr(node, 'resolved_ips'):
|
|
continue
|
|
ipasn_entries = {}
|
|
cflare_entries = {}
|
|
if 'v4' in node.resolved_ips and 'v6' in node.resolved_ips:
|
|
_all_ips = set(node.resolved_ips['v4']) | set(node.resolved_ips['v6'])
|
|
else:
|
|
# old format
|
|
_all_ips = node.resolved_ips
|
|
for ip in _all_ips:
|
|
if ip in ipasn:
|
|
ipasn_entries[ip] = ipasn[ip]
|
|
if ip in cflare_hits:
|
|
cflare_entries[ip] = True
|
|
|
|
if ipasn_entries:
|
|
node.add_feature('ipasn', ipasn_entries)
|
|
if cflare_entries:
|
|
node.add_feature('cloudflare', cflare_entries)
|
|
|
|
with cnames_path.open('w') as f:
|
|
json.dump(host_cnames, f)
|
|
with ips_path.open('w') as f:
|
|
json.dump(host_ips, f, default=serialize_sets)
|
|
with ipasn_path.open('w') as f:
|
|
json.dump(ipasn, f)
|
|
return ct
|