feat: fleet-wide MACVLAN sniffer microservice
Replace per-decky sniffer containers with a single host-side sniffer that monitors all traffic on the MACVLAN interface. Runs as a background task in the FastAPI lifespan alongside the collector, fully fault-isolated so failures never crash the API. - Add fleet_singleton flag to BaseService; sniffer marked as singleton - Composer skips fleet_singleton services in compose generation - Fleet builder excludes singletons from random service assignment - Extract TLS fingerprinting engine from templates/sniffer/server.py into decnet/sniffer/ package (parameterized for fleet-wide use) - Sniffer worker maps packets to deckies via IP→name state mapping - Original templates/sniffer/server.py preserved for future use
This commit is contained in:
11
decnet/sniffer/__init__.py
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11
decnet/sniffer/__init__.py
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"""
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Fleet-wide MACVLAN sniffer microservice.
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Runs as a single host-side background task (not per-decky) that sniffs
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all TLS traffic on the MACVLAN interface, extracts fingerprints, and
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feeds events into the existing log pipeline.
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"""
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from decnet.sniffer.worker import sniffer_worker
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__all__ = ["sniffer_worker"]
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884
decnet/sniffer/fingerprint.py
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884
decnet/sniffer/fingerprint.py
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@@ -0,0 +1,884 @@
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"""
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TLS fingerprinting engine for the fleet-wide MACVLAN sniffer.
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Extracted from templates/sniffer/server.py. All pure-Python TLS parsing,
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JA3/JA3S/JA4/JA4S/JA4L computation, session tracking, and dedup logic
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lives here. The packet callback is parameterized to accept an IP-to-decky
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mapping and a write function, so it works for fleet-wide sniffing.
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"""
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from __future__ import annotations
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import hashlib
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import struct
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import time
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from pathlib import Path
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from typing import Any, Callable
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from decnet.sniffer.syslog import SEVERITY_INFO, SEVERITY_WARNING, syslog_line
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# ─── Constants ───────────────────────────────────────────────────────────────
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SERVICE_NAME: str = "sniffer"
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_SESSION_TTL: float = 60.0
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_DEDUP_TTL: float = 300.0
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_GREASE: frozenset[int] = frozenset(0x0A0A + i * 0x1010 for i in range(16))
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_TLS_RECORD_HANDSHAKE: int = 0x16
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_TLS_HT_CLIENT_HELLO: int = 0x01
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_TLS_HT_SERVER_HELLO: int = 0x02
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_TLS_HT_CERTIFICATE: int = 0x0B
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_EXT_SNI: int = 0x0000
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_EXT_SUPPORTED_GROUPS: int = 0x000A
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_EXT_EC_POINT_FORMATS: int = 0x000B
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_EXT_SIGNATURE_ALGORITHMS: int = 0x000D
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_EXT_ALPN: int = 0x0010
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_EXT_SESSION_TICKET: int = 0x0023
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_EXT_SUPPORTED_VERSIONS: int = 0x002B
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_EXT_PRE_SHARED_KEY: int = 0x0029
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_EXT_EARLY_DATA: int = 0x002A
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_TCP_SYN: int = 0x02
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_TCP_ACK: int = 0x10
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# ─── GREASE helpers ──────────────────────────────────────────────────────────
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def _is_grease(value: int) -> bool:
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return value in _GREASE
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def _filter_grease(values: list[int]) -> list[int]:
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return [v for v in values if not _is_grease(v)]
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# ─── TLS parsers ─────────────────────────────────────────────────────────────
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def _parse_client_hello(data: bytes) -> dict[str, Any] | None:
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try:
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if len(data) < 6:
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return None
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if data[0] != _TLS_RECORD_HANDSHAKE:
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return None
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record_len = struct.unpack_from("!H", data, 3)[0]
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if len(data) < 5 + record_len:
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return None
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hs = data[5:]
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if hs[0] != _TLS_HT_CLIENT_HELLO:
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return None
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hs_len = struct.unpack_from("!I", b"\x00" + hs[1:4])[0]
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body = hs[4: 4 + hs_len]
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if len(body) < 34:
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return None
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pos = 0
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tls_version = struct.unpack_from("!H", body, pos)[0]
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pos += 2
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pos += 32 # Random
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session_id_len = body[pos]
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session_id = body[pos + 1: pos + 1 + session_id_len]
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pos += 1 + session_id_len
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cs_len = struct.unpack_from("!H", body, pos)[0]
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pos += 2
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cipher_suites = [
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struct.unpack_from("!H", body, pos + i * 2)[0]
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for i in range(cs_len // 2)
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]
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pos += cs_len
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comp_len = body[pos]
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pos += 1 + comp_len
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extensions: list[int] = []
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supported_groups: list[int] = []
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ec_point_formats: list[int] = []
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signature_algorithms: list[int] = []
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supported_versions: list[int] = []
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sni: str = ""
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alpn: list[str] = []
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has_session_ticket_data: bool = False
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has_pre_shared_key: bool = False
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has_early_data: bool = False
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if pos + 2 <= len(body):
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ext_total = struct.unpack_from("!H", body, pos)[0]
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pos += 2
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ext_end = pos + ext_total
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while pos + 4 <= ext_end:
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ext_type = struct.unpack_from("!H", body, pos)[0]
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ext_len = struct.unpack_from("!H", body, pos + 2)[0]
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ext_data = body[pos + 4: pos + 4 + ext_len]
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pos += 4 + ext_len
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if not _is_grease(ext_type):
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extensions.append(ext_type)
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if ext_type == _EXT_SNI and len(ext_data) > 5:
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sni = ext_data[5:].decode("ascii", errors="replace")
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elif ext_type == _EXT_SUPPORTED_GROUPS and len(ext_data) >= 2:
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grp_len = struct.unpack_from("!H", ext_data, 0)[0]
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supported_groups = [
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struct.unpack_from("!H", ext_data, 2 + i * 2)[0]
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for i in range(grp_len // 2)
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]
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elif ext_type == _EXT_EC_POINT_FORMATS and len(ext_data) >= 1:
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pf_len = ext_data[0]
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ec_point_formats = list(ext_data[1: 1 + pf_len])
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elif ext_type == _EXT_ALPN and len(ext_data) >= 2:
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proto_list_len = struct.unpack_from("!H", ext_data, 0)[0]
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ap = 2
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while ap < 2 + proto_list_len:
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plen = ext_data[ap]
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alpn.append(ext_data[ap + 1: ap + 1 + plen].decode("ascii", errors="replace"))
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ap += 1 + plen
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elif ext_type == _EXT_SIGNATURE_ALGORITHMS and len(ext_data) >= 2:
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sa_len = struct.unpack_from("!H", ext_data, 0)[0]
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signature_algorithms = [
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struct.unpack_from("!H", ext_data, 2 + i * 2)[0]
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for i in range(sa_len // 2)
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]
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elif ext_type == _EXT_SUPPORTED_VERSIONS and len(ext_data) >= 1:
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sv_len = ext_data[0]
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supported_versions = [
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struct.unpack_from("!H", ext_data, 1 + i * 2)[0]
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for i in range(sv_len // 2)
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]
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elif ext_type == _EXT_SESSION_TICKET:
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has_session_ticket_data = len(ext_data) > 0
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elif ext_type == _EXT_PRE_SHARED_KEY:
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has_pre_shared_key = True
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elif ext_type == _EXT_EARLY_DATA:
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has_early_data = True
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filtered_ciphers = _filter_grease(cipher_suites)
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filtered_groups = _filter_grease(supported_groups)
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filtered_sig_algs = _filter_grease(signature_algorithms)
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filtered_versions = _filter_grease(supported_versions)
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return {
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"tls_version": tls_version,
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"cipher_suites": filtered_ciphers,
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"extensions": extensions,
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"supported_groups": filtered_groups,
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"ec_point_formats": ec_point_formats,
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"signature_algorithms": filtered_sig_algs,
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"supported_versions": filtered_versions,
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"sni": sni,
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"alpn": alpn,
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"session_id": session_id,
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"has_session_ticket_data": has_session_ticket_data,
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"has_pre_shared_key": has_pre_shared_key,
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"has_early_data": has_early_data,
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}
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except Exception:
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return None
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def _parse_server_hello(data: bytes) -> dict[str, Any] | None:
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try:
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if len(data) < 6 or data[0] != _TLS_RECORD_HANDSHAKE:
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return None
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hs = data[5:]
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if hs[0] != _TLS_HT_SERVER_HELLO:
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return None
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hs_len = struct.unpack_from("!I", b"\x00" + hs[1:4])[0]
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body = hs[4: 4 + hs_len]
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if len(body) < 35:
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return None
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pos = 0
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tls_version = struct.unpack_from("!H", body, pos)[0]
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pos += 2
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pos += 32 # Random
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session_id_len = body[pos]
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pos += 1 + session_id_len
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if pos + 2 > len(body):
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return None
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cipher_suite = struct.unpack_from("!H", body, pos)[0]
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pos += 2
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pos += 1 # Compression method
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extensions: list[int] = []
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selected_version: int | None = None
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alpn: str = ""
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if pos + 2 <= len(body):
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ext_total = struct.unpack_from("!H", body, pos)[0]
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pos += 2
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ext_end = pos + ext_total
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while pos + 4 <= ext_end:
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ext_type = struct.unpack_from("!H", body, pos)[0]
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ext_len = struct.unpack_from("!H", body, pos + 2)[0]
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ext_data = body[pos + 4: pos + 4 + ext_len]
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pos += 4 + ext_len
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if not _is_grease(ext_type):
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extensions.append(ext_type)
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if ext_type == _EXT_SUPPORTED_VERSIONS and len(ext_data) >= 2:
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selected_version = struct.unpack_from("!H", ext_data, 0)[0]
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elif ext_type == _EXT_ALPN and len(ext_data) >= 2:
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proto_list_len = struct.unpack_from("!H", ext_data, 0)[0]
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if proto_list_len > 0 and len(ext_data) >= 4:
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plen = ext_data[2]
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alpn = ext_data[3: 3 + plen].decode("ascii", errors="replace")
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return {
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"tls_version": tls_version,
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"cipher_suite": cipher_suite,
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"extensions": extensions,
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"selected_version": selected_version,
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"alpn": alpn,
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}
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except Exception:
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return None
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def _parse_certificate(data: bytes) -> dict[str, Any] | None:
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try:
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if len(data) < 6 or data[0] != _TLS_RECORD_HANDSHAKE:
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return None
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hs = data[5:]
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if hs[0] != _TLS_HT_CERTIFICATE:
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return None
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hs_len = struct.unpack_from("!I", b"\x00" + hs[1:4])[0]
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body = hs[4: 4 + hs_len]
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if len(body) < 3:
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return None
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certs_len = struct.unpack_from("!I", b"\x00" + body[0:3])[0]
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if certs_len == 0:
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return None
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pos = 3
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if pos + 3 > len(body):
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return None
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cert_len = struct.unpack_from("!I", b"\x00" + body[pos:pos + 3])[0]
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pos += 3
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if pos + cert_len > len(body):
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return None
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cert_der = body[pos: pos + cert_len]
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return _parse_x509_der(cert_der)
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except Exception:
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return None
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# ─── Minimal DER/ASN.1 X.509 parser ─────────────────────────────────────────
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def _der_read_tag_len(data: bytes, pos: int) -> tuple[int, int, int]:
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tag = data[pos]
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pos += 1
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length_byte = data[pos]
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pos += 1
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if length_byte & 0x80:
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num_bytes = length_byte & 0x7F
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length = int.from_bytes(data[pos: pos + num_bytes], "big")
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pos += num_bytes
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else:
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length = length_byte
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return tag, pos, length
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def _der_read_sequence(data: bytes, pos: int) -> tuple[int, int]:
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tag, content_start, length = _der_read_tag_len(data, pos)
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return content_start, length
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def _der_read_oid(data: bytes, pos: int, length: int) -> str:
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if length < 1:
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return ""
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first = data[pos]
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oid_parts = [str(first // 40), str(first % 40)]
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val = 0
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for i in range(1, length):
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b = data[pos + i]
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val = (val << 7) | (b & 0x7F)
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if not (b & 0x80):
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oid_parts.append(str(val))
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val = 0
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return ".".join(oid_parts)
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def _der_extract_cn(data: bytes, start: int, length: int) -> str:
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pos = start
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end = start + length
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while pos < end:
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set_tag, set_start, set_len = _der_read_tag_len(data, pos)
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if set_tag != 0x31:
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break
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set_end = set_start + set_len
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attr_pos = set_start
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while attr_pos < set_end:
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seq_tag, seq_start, seq_len = _der_read_tag_len(data, attr_pos)
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if seq_tag != 0x30:
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break
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oid_tag, oid_start, oid_len = _der_read_tag_len(data, seq_start)
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if oid_tag == 0x06:
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oid = _der_read_oid(data, oid_start, oid_len)
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if oid == "2.5.4.3":
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val_tag, val_start, val_len = _der_read_tag_len(data, oid_start + oid_len)
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return data[val_start: val_start + val_len].decode("utf-8", errors="replace")
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attr_pos = seq_start + seq_len
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pos = set_end
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return ""
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def _der_extract_name_str(data: bytes, start: int, length: int) -> str:
|
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parts: list[str] = []
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pos = start
|
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end = start + length
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oid_names = {
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"2.5.4.3": "CN",
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"2.5.4.6": "C",
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"2.5.4.7": "L",
|
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"2.5.4.8": "ST",
|
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"2.5.4.10": "O",
|
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"2.5.4.11": "OU",
|
||||
}
|
||||
while pos < end:
|
||||
set_tag, set_start, set_len = _der_read_tag_len(data, pos)
|
||||
if set_tag != 0x31:
|
||||
break
|
||||
set_end = set_start + set_len
|
||||
attr_pos = set_start
|
||||
while attr_pos < set_end:
|
||||
seq_tag, seq_start, seq_len = _der_read_tag_len(data, attr_pos)
|
||||
if seq_tag != 0x30:
|
||||
break
|
||||
oid_tag, oid_start, oid_len = _der_read_tag_len(data, seq_start)
|
||||
if oid_tag == 0x06:
|
||||
oid = _der_read_oid(data, oid_start, oid_len)
|
||||
val_tag, val_start, val_len = _der_read_tag_len(data, oid_start + oid_len)
|
||||
val = data[val_start: val_start + val_len].decode("utf-8", errors="replace")
|
||||
name = oid_names.get(oid, oid)
|
||||
parts.append(f"{name}={val}")
|
||||
attr_pos = seq_start + seq_len
|
||||
pos = set_end
|
||||
return ", ".join(parts)
|
||||
|
||||
|
||||
def _parse_x509_der(cert_der: bytes) -> dict[str, Any] | None:
|
||||
try:
|
||||
outer_start, outer_len = _der_read_sequence(cert_der, 0)
|
||||
tbs_tag, tbs_start, tbs_len = _der_read_tag_len(cert_der, outer_start)
|
||||
tbs_end = tbs_start + tbs_len
|
||||
pos = tbs_start
|
||||
|
||||
if cert_der[pos] == 0xA0:
|
||||
_, v_start, v_len = _der_read_tag_len(cert_der, pos)
|
||||
pos = v_start + v_len
|
||||
|
||||
_, sn_start, sn_len = _der_read_tag_len(cert_der, pos)
|
||||
pos = sn_start + sn_len
|
||||
|
||||
_, sa_start, sa_len = _der_read_tag_len(cert_der, pos)
|
||||
pos = sa_start + sa_len
|
||||
|
||||
issuer_tag, issuer_start, issuer_len = _der_read_tag_len(cert_der, pos)
|
||||
issuer_str = _der_extract_name_str(cert_der, issuer_start, issuer_len)
|
||||
issuer_cn = _der_extract_cn(cert_der, issuer_start, issuer_len)
|
||||
pos = issuer_start + issuer_len
|
||||
|
||||
val_tag, val_start, val_len = _der_read_tag_len(cert_der, pos)
|
||||
nb_tag, nb_start, nb_len = _der_read_tag_len(cert_der, val_start)
|
||||
not_before = cert_der[nb_start: nb_start + nb_len].decode("ascii", errors="replace")
|
||||
na_tag, na_start, na_len = _der_read_tag_len(cert_der, nb_start + nb_len)
|
||||
not_after = cert_der[na_start: na_start + na_len].decode("ascii", errors="replace")
|
||||
pos = val_start + val_len
|
||||
|
||||
subj_tag, subj_start, subj_len = _der_read_tag_len(cert_der, pos)
|
||||
subject_cn = _der_extract_cn(cert_der, subj_start, subj_len)
|
||||
subject_str = _der_extract_name_str(cert_der, subj_start, subj_len)
|
||||
|
||||
self_signed = (issuer_cn == subject_cn) and subject_cn != ""
|
||||
|
||||
pos = subj_start + subj_len
|
||||
sans: list[str] = _extract_sans(cert_der, pos, tbs_end)
|
||||
|
||||
return {
|
||||
"subject_cn": subject_cn,
|
||||
"subject": subject_str,
|
||||
"issuer": issuer_str,
|
||||
"issuer_cn": issuer_cn,
|
||||
"not_before": not_before,
|
||||
"not_after": not_after,
|
||||
"self_signed": self_signed,
|
||||
"sans": sans,
|
||||
}
|
||||
|
||||
except Exception:
|
||||
return None
|
||||
|
||||
|
||||
def _extract_sans(cert_der: bytes, pos: int, end: int) -> list[str]:
|
||||
sans: list[str] = []
|
||||
try:
|
||||
if pos >= end:
|
||||
return sans
|
||||
spki_tag, spki_start, spki_len = _der_read_tag_len(cert_der, pos)
|
||||
pos = spki_start + spki_len
|
||||
|
||||
while pos < end:
|
||||
tag = cert_der[pos]
|
||||
if tag == 0xA3:
|
||||
_, ext_wrap_start, ext_wrap_len = _der_read_tag_len(cert_der, pos)
|
||||
_, exts_start, exts_len = _der_read_tag_len(cert_der, ext_wrap_start)
|
||||
epos = exts_start
|
||||
eend = exts_start + exts_len
|
||||
while epos < eend:
|
||||
ext_tag, ext_start, ext_len = _der_read_tag_len(cert_der, epos)
|
||||
ext_end = ext_start + ext_len
|
||||
oid_tag, oid_start, oid_len = _der_read_tag_len(cert_der, ext_start)
|
||||
if oid_tag == 0x06:
|
||||
oid = _der_read_oid(cert_der, oid_start, oid_len)
|
||||
if oid == "2.5.29.17":
|
||||
vpos = oid_start + oid_len
|
||||
if vpos < ext_end and cert_der[vpos] == 0x01:
|
||||
_, bs, bl = _der_read_tag_len(cert_der, vpos)
|
||||
vpos = bs + bl
|
||||
if vpos < ext_end:
|
||||
os_tag, os_start, os_len = _der_read_tag_len(cert_der, vpos)
|
||||
if os_tag == 0x04:
|
||||
sans = _parse_san_sequence(cert_der, os_start, os_len)
|
||||
epos = ext_end
|
||||
break
|
||||
else:
|
||||
_, skip_start, skip_len = _der_read_tag_len(cert_der, pos)
|
||||
pos = skip_start + skip_len
|
||||
except Exception:
|
||||
pass
|
||||
return sans
|
||||
|
||||
|
||||
def _parse_san_sequence(data: bytes, start: int, length: int) -> list[str]:
|
||||
names: list[str] = []
|
||||
try:
|
||||
seq_tag, seq_start, seq_len = _der_read_tag_len(data, start)
|
||||
pos = seq_start
|
||||
end = seq_start + seq_len
|
||||
while pos < end:
|
||||
tag = data[pos]
|
||||
_, val_start, val_len = _der_read_tag_len(data, pos)
|
||||
context_tag = tag & 0x1F
|
||||
if context_tag == 2:
|
||||
names.append(data[val_start: val_start + val_len].decode("ascii", errors="replace"))
|
||||
elif context_tag == 7 and val_len == 4:
|
||||
names.append(".".join(str(b) for b in data[val_start: val_start + val_len]))
|
||||
pos = val_start + val_len
|
||||
except Exception:
|
||||
pass
|
||||
return names
|
||||
|
||||
|
||||
# ─── JA3 / JA3S ─────────────────────────────────────────────────────────────
|
||||
|
||||
def _tls_version_str(version: int) -> str:
|
||||
return {
|
||||
0x0301: "TLS 1.0",
|
||||
0x0302: "TLS 1.1",
|
||||
0x0303: "TLS 1.2",
|
||||
0x0304: "TLS 1.3",
|
||||
0x0200: "SSL 2.0",
|
||||
0x0300: "SSL 3.0",
|
||||
}.get(version, f"0x{version:04x}")
|
||||
|
||||
|
||||
def _ja3(ch: dict[str, Any]) -> tuple[str, str]:
|
||||
parts = [
|
||||
str(ch["tls_version"]),
|
||||
"-".join(str(c) for c in ch["cipher_suites"]),
|
||||
"-".join(str(e) for e in ch["extensions"]),
|
||||
"-".join(str(g) for g in ch["supported_groups"]),
|
||||
"-".join(str(p) for p in ch["ec_point_formats"]),
|
||||
]
|
||||
ja3_str = ",".join(parts)
|
||||
return ja3_str, hashlib.md5(ja3_str.encode()).hexdigest()
|
||||
|
||||
|
||||
def _ja3s(sh: dict[str, Any]) -> tuple[str, str]:
|
||||
parts = [
|
||||
str(sh["tls_version"]),
|
||||
str(sh["cipher_suite"]),
|
||||
"-".join(str(e) for e in sh["extensions"]),
|
||||
]
|
||||
ja3s_str = ",".join(parts)
|
||||
return ja3s_str, hashlib.md5(ja3s_str.encode()).hexdigest()
|
||||
|
||||
|
||||
# ─── JA4 / JA4S ─────────────────────────────────────────────────────────────
|
||||
|
||||
def _ja4_version(ch: dict[str, Any]) -> str:
|
||||
versions = ch.get("supported_versions", [])
|
||||
if versions:
|
||||
best = max(versions)
|
||||
else:
|
||||
best = ch["tls_version"]
|
||||
return {
|
||||
0x0304: "13",
|
||||
0x0303: "12",
|
||||
0x0302: "11",
|
||||
0x0301: "10",
|
||||
0x0300: "s3",
|
||||
0x0200: "s2",
|
||||
}.get(best, "00")
|
||||
|
||||
|
||||
def _ja4_alpn_tag(alpn_list: list[str] | str) -> str:
|
||||
if isinstance(alpn_list, str):
|
||||
proto = alpn_list
|
||||
elif alpn_list:
|
||||
proto = alpn_list[0]
|
||||
else:
|
||||
return "00"
|
||||
if not proto:
|
||||
return "00"
|
||||
if len(proto) == 1:
|
||||
return proto[0] + proto[0]
|
||||
return proto[0] + proto[-1]
|
||||
|
||||
|
||||
def _sha256_12(text: str) -> str:
|
||||
return hashlib.sha256(text.encode()).hexdigest()[:12]
|
||||
|
||||
|
||||
def _ja4(ch: dict[str, Any]) -> str:
|
||||
proto = "t"
|
||||
ver = _ja4_version(ch)
|
||||
sni_flag = "d" if ch.get("sni") else "i"
|
||||
cs_count = min(len(ch["cipher_suites"]), 99)
|
||||
ext_count = min(len(ch["extensions"]), 99)
|
||||
alpn_tag = _ja4_alpn_tag(ch.get("alpn", []))
|
||||
section_a = f"{proto}{ver}{sni_flag}{cs_count:02d}{ext_count:02d}{alpn_tag}"
|
||||
sorted_cs = sorted(ch["cipher_suites"])
|
||||
section_b = _sha256_12(",".join(str(c) for c in sorted_cs))
|
||||
sorted_ext = sorted(ch["extensions"])
|
||||
sorted_sa = sorted(ch.get("signature_algorithms", []))
|
||||
ext_str = ",".join(str(e) for e in sorted_ext)
|
||||
sa_str = ",".join(str(s) for s in sorted_sa)
|
||||
combined = f"{ext_str}_{sa_str}" if sa_str else ext_str
|
||||
section_c = _sha256_12(combined)
|
||||
return f"{section_a}_{section_b}_{section_c}"
|
||||
|
||||
|
||||
def _ja4s(sh: dict[str, Any]) -> str:
|
||||
proto = "t"
|
||||
selected = sh.get("selected_version")
|
||||
if selected:
|
||||
ver = {0x0304: "13", 0x0303: "12", 0x0302: "11", 0x0301: "10",
|
||||
0x0300: "s3", 0x0200: "s2"}.get(selected, "00")
|
||||
else:
|
||||
ver = {0x0304: "13", 0x0303: "12", 0x0302: "11", 0x0301: "10",
|
||||
0x0300: "s3", 0x0200: "s2"}.get(sh["tls_version"], "00")
|
||||
ext_count = min(len(sh["extensions"]), 99)
|
||||
alpn_tag = _ja4_alpn_tag(sh.get("alpn", ""))
|
||||
section_a = f"{proto}{ver}{ext_count:02d}{alpn_tag}"
|
||||
sorted_ext = sorted(sh["extensions"])
|
||||
inner = f"{sh['cipher_suite']},{','.join(str(e) for e in sorted_ext)}"
|
||||
section_b = _sha256_12(inner)
|
||||
return f"{section_a}_{section_b}"
|
||||
|
||||
|
||||
# ─── JA4L (latency) ─────────────────────────────────────────────────────────
|
||||
|
||||
def _ja4l(
|
||||
key: tuple[str, int, str, int],
|
||||
tcp_rtt: dict[tuple[str, int, str, int], dict[str, Any]],
|
||||
) -> dict[str, Any] | None:
|
||||
return tcp_rtt.get(key)
|
||||
|
||||
|
||||
# ─── Session resumption ─────────────────────────────────────────────────────
|
||||
|
||||
def _session_resumption_info(ch: dict[str, Any]) -> dict[str, Any]:
|
||||
mechanisms: list[str] = []
|
||||
if ch.get("has_session_ticket_data"):
|
||||
mechanisms.append("session_ticket")
|
||||
if ch.get("has_pre_shared_key"):
|
||||
mechanisms.append("psk")
|
||||
if ch.get("has_early_data"):
|
||||
mechanisms.append("early_data_0rtt")
|
||||
if ch.get("session_id") and len(ch["session_id"]) > 0:
|
||||
mechanisms.append("session_id")
|
||||
return {
|
||||
"resumption_attempted": len(mechanisms) > 0,
|
||||
"mechanisms": mechanisms,
|
||||
}
|
||||
|
||||
|
||||
# ─── Sniffer engine (stateful, one instance per worker) ─────────────────────
|
||||
|
||||
class SnifferEngine:
|
||||
"""
|
||||
Stateful TLS fingerprinting engine. Tracks sessions, TCP RTTs,
|
||||
and dedup state. Thread-safe only when called from a single thread
|
||||
(the scapy sniff thread).
|
||||
"""
|
||||
|
||||
def __init__(
|
||||
self,
|
||||
ip_to_decky: dict[str, str],
|
||||
write_fn: Callable[[str], None],
|
||||
dedup_ttl: float = 300.0,
|
||||
):
|
||||
self._ip_to_decky = ip_to_decky
|
||||
self._write_fn = write_fn
|
||||
self._dedup_ttl = dedup_ttl
|
||||
|
||||
self._sessions: dict[tuple[str, int, str, int], dict[str, Any]] = {}
|
||||
self._session_ts: dict[tuple[str, int, str, int], float] = {}
|
||||
self._tcp_syn: dict[tuple[str, int, str, int], dict[str, Any]] = {}
|
||||
self._tcp_rtt: dict[tuple[str, int, str, int], dict[str, Any]] = {}
|
||||
|
||||
self._dedup_cache: dict[tuple[str, str, str], float] = {}
|
||||
self._dedup_last_cleanup: float = 0.0
|
||||
self._DEDUP_CLEANUP_INTERVAL: float = 60.0
|
||||
|
||||
def update_ip_map(self, ip_to_decky: dict[str, str]) -> None:
|
||||
self._ip_to_decky = ip_to_decky
|
||||
|
||||
def _resolve_decky(self, src_ip: str, dst_ip: str) -> str | None:
|
||||
"""Map a packet to a decky name. Returns None if neither IP is a known decky."""
|
||||
if dst_ip in self._ip_to_decky:
|
||||
return self._ip_to_decky[dst_ip]
|
||||
if src_ip in self._ip_to_decky:
|
||||
return self._ip_to_decky[src_ip]
|
||||
return None
|
||||
|
||||
def _cleanup_sessions(self) -> None:
|
||||
now = time.monotonic()
|
||||
stale = [k for k, ts in self._session_ts.items() if now - ts > _SESSION_TTL]
|
||||
for k in stale:
|
||||
self._sessions.pop(k, None)
|
||||
self._session_ts.pop(k, None)
|
||||
stale_syn = [k for k, v in self._tcp_syn.items()
|
||||
if now - v.get("time", 0) > _SESSION_TTL]
|
||||
for k in stale_syn:
|
||||
self._tcp_syn.pop(k, None)
|
||||
stale_rtt = [k for k, _ in self._tcp_rtt.items()
|
||||
if k not in self._sessions and k not in self._session_ts]
|
||||
for k in stale_rtt:
|
||||
self._tcp_rtt.pop(k, None)
|
||||
|
||||
def _dedup_key_for(self, event_type: str, fields: dict[str, Any]) -> str:
|
||||
if event_type == "tls_client_hello":
|
||||
return fields.get("ja3", "") + "|" + fields.get("ja4", "")
|
||||
if event_type == "tls_session":
|
||||
return (fields.get("ja3", "") + "|" + fields.get("ja3s", "") +
|
||||
"|" + fields.get("ja4", "") + "|" + fields.get("ja4s", ""))
|
||||
if event_type == "tls_certificate":
|
||||
return fields.get("subject_cn", "") + "|" + fields.get("issuer", "")
|
||||
return fields.get("mechanisms", fields.get("resumption", ""))
|
||||
|
||||
def _is_duplicate(self, event_type: str, fields: dict[str, Any]) -> bool:
|
||||
if self._dedup_ttl <= 0:
|
||||
return False
|
||||
now = time.monotonic()
|
||||
if now - self._dedup_last_cleanup > self._DEDUP_CLEANUP_INTERVAL:
|
||||
stale = [k for k, ts in self._dedup_cache.items() if now - ts > self._dedup_ttl]
|
||||
for k in stale:
|
||||
del self._dedup_cache[k]
|
||||
self._dedup_last_cleanup = now
|
||||
src_ip = fields.get("src_ip", "")
|
||||
fp = self._dedup_key_for(event_type, fields)
|
||||
cache_key = (src_ip, event_type, fp)
|
||||
last_seen = self._dedup_cache.get(cache_key)
|
||||
if last_seen is not None and now - last_seen < self._dedup_ttl:
|
||||
return True
|
||||
self._dedup_cache[cache_key] = now
|
||||
return False
|
||||
|
||||
def _log(self, node_name: str, event_type: str, severity: int = SEVERITY_INFO, **fields: Any) -> None:
|
||||
if self._is_duplicate(event_type, fields):
|
||||
return
|
||||
line = syslog_line(SERVICE_NAME, node_name, event_type, severity=severity, **fields)
|
||||
self._write_fn(line)
|
||||
|
||||
def on_packet(self, pkt: Any) -> None:
|
||||
"""Process a single scapy packet. Called from the sniff thread."""
|
||||
try:
|
||||
from scapy.layers.inet import IP, TCP
|
||||
except ImportError:
|
||||
return
|
||||
|
||||
if not (pkt.haslayer(IP) and pkt.haslayer(TCP)):
|
||||
return
|
||||
|
||||
ip = pkt[IP]
|
||||
tcp = pkt[TCP]
|
||||
|
||||
src_ip: str = ip.src
|
||||
dst_ip: str = ip.dst
|
||||
src_port: int = tcp.sport
|
||||
dst_port: int = tcp.dport
|
||||
flags: int = tcp.flags.value if hasattr(tcp.flags, 'value') else int(tcp.flags)
|
||||
|
||||
# Skip traffic not involving any decky
|
||||
node_name = self._resolve_decky(src_ip, dst_ip)
|
||||
if node_name is None:
|
||||
return
|
||||
|
||||
# TCP SYN tracking for JA4L
|
||||
if flags & _TCP_SYN and not (flags & _TCP_ACK):
|
||||
key = (src_ip, src_port, dst_ip, dst_port)
|
||||
self._tcp_syn[key] = {"time": time.monotonic(), "ttl": ip.ttl}
|
||||
|
||||
elif flags & _TCP_SYN and flags & _TCP_ACK:
|
||||
rev_key = (dst_ip, dst_port, src_ip, src_port)
|
||||
syn_data = self._tcp_syn.pop(rev_key, None)
|
||||
if syn_data:
|
||||
rtt_ms = round((time.monotonic() - syn_data["time"]) * 1000, 2)
|
||||
self._tcp_rtt[rev_key] = {
|
||||
"rtt_ms": rtt_ms,
|
||||
"client_ttl": syn_data["ttl"],
|
||||
}
|
||||
|
||||
payload = bytes(tcp.payload)
|
||||
if not payload:
|
||||
return
|
||||
|
||||
if payload[0] != _TLS_RECORD_HANDSHAKE:
|
||||
return
|
||||
|
||||
# ClientHello
|
||||
ch = _parse_client_hello(payload)
|
||||
if ch is not None:
|
||||
self._cleanup_sessions()
|
||||
|
||||
key = (src_ip, src_port, dst_ip, dst_port)
|
||||
ja3_str, ja3_hash = _ja3(ch)
|
||||
ja4_hash = _ja4(ch)
|
||||
resumption = _session_resumption_info(ch)
|
||||
rtt_data = _ja4l(key, self._tcp_rtt)
|
||||
|
||||
self._sessions[key] = {
|
||||
"ja3": ja3_hash,
|
||||
"ja3_str": ja3_str,
|
||||
"ja4": ja4_hash,
|
||||
"tls_version": ch["tls_version"],
|
||||
"cipher_suites": ch["cipher_suites"],
|
||||
"extensions": ch["extensions"],
|
||||
"signature_algorithms": ch.get("signature_algorithms", []),
|
||||
"supported_versions": ch.get("supported_versions", []),
|
||||
"sni": ch["sni"],
|
||||
"alpn": ch["alpn"],
|
||||
"resumption": resumption,
|
||||
}
|
||||
self._session_ts[key] = time.monotonic()
|
||||
|
||||
log_fields: dict[str, Any] = {
|
||||
"src_ip": src_ip,
|
||||
"src_port": str(src_port),
|
||||
"dst_ip": dst_ip,
|
||||
"dst_port": str(dst_port),
|
||||
"ja3": ja3_hash,
|
||||
"ja4": ja4_hash,
|
||||
"tls_version": _tls_version_str(ch["tls_version"]),
|
||||
"sni": ch["sni"] or "",
|
||||
"alpn": ",".join(ch["alpn"]),
|
||||
"raw_ciphers": "-".join(str(c) for c in ch["cipher_suites"]),
|
||||
"raw_extensions": "-".join(str(e) for e in ch["extensions"]),
|
||||
}
|
||||
|
||||
if resumption["resumption_attempted"]:
|
||||
log_fields["resumption"] = ",".join(resumption["mechanisms"])
|
||||
|
||||
if rtt_data:
|
||||
log_fields["ja4l_rtt_ms"] = str(rtt_data["rtt_ms"])
|
||||
log_fields["ja4l_client_ttl"] = str(rtt_data["client_ttl"])
|
||||
|
||||
# Resolve node for the *destination* (the decky being attacked)
|
||||
target_node = self._ip_to_decky.get(dst_ip, node_name)
|
||||
self._log(target_node, "tls_client_hello", **log_fields)
|
||||
return
|
||||
|
||||
# ServerHello
|
||||
sh = _parse_server_hello(payload)
|
||||
if sh is not None:
|
||||
rev_key = (dst_ip, dst_port, src_ip, src_port)
|
||||
ch_data = self._sessions.pop(rev_key, None)
|
||||
self._session_ts.pop(rev_key, None)
|
||||
|
||||
ja3s_str, ja3s_hash = _ja3s(sh)
|
||||
ja4s_hash = _ja4s(sh)
|
||||
|
||||
fields: dict[str, Any] = {
|
||||
"src_ip": dst_ip,
|
||||
"src_port": str(dst_port),
|
||||
"dst_ip": src_ip,
|
||||
"dst_port": str(src_port),
|
||||
"ja3s": ja3s_hash,
|
||||
"ja4s": ja4s_hash,
|
||||
"tls_version": _tls_version_str(sh["tls_version"]),
|
||||
}
|
||||
|
||||
if ch_data:
|
||||
fields["ja3"] = ch_data["ja3"]
|
||||
fields["ja4"] = ch_data.get("ja4", "")
|
||||
fields["sni"] = ch_data["sni"] or ""
|
||||
fields["alpn"] = ",".join(ch_data["alpn"])
|
||||
fields["raw_ciphers"] = "-".join(str(c) for c in ch_data["cipher_suites"])
|
||||
fields["raw_extensions"] = "-".join(str(e) for e in ch_data["extensions"])
|
||||
if ch_data.get("resumption", {}).get("resumption_attempted"):
|
||||
fields["resumption"] = ",".join(ch_data["resumption"]["mechanisms"])
|
||||
|
||||
rtt_data = self._tcp_rtt.pop(rev_key, None)
|
||||
if rtt_data:
|
||||
fields["ja4l_rtt_ms"] = str(rtt_data["rtt_ms"])
|
||||
fields["ja4l_client_ttl"] = str(rtt_data["client_ttl"])
|
||||
|
||||
# Server response — resolve by src_ip (the decky responding)
|
||||
target_node = self._ip_to_decky.get(src_ip, node_name)
|
||||
self._log(target_node, "tls_session", severity=SEVERITY_WARNING, **fields)
|
||||
return
|
||||
|
||||
# Certificate (TLS 1.2 only)
|
||||
cert = _parse_certificate(payload)
|
||||
if cert is not None:
|
||||
rev_key = (dst_ip, dst_port, src_ip, src_port)
|
||||
ch_data = self._sessions.get(rev_key)
|
||||
|
||||
cert_fields: dict[str, Any] = {
|
||||
"src_ip": dst_ip,
|
||||
"src_port": str(dst_port),
|
||||
"dst_ip": src_ip,
|
||||
"dst_port": str(src_port),
|
||||
"subject_cn": cert["subject_cn"],
|
||||
"issuer": cert["issuer"],
|
||||
"self_signed": str(cert["self_signed"]).lower(),
|
||||
"not_before": cert["not_before"],
|
||||
"not_after": cert["not_after"],
|
||||
}
|
||||
if cert["sans"]:
|
||||
cert_fields["sans"] = ",".join(cert["sans"])
|
||||
if ch_data:
|
||||
cert_fields["sni"] = ch_data.get("sni", "")
|
||||
|
||||
target_node = self._ip_to_decky.get(src_ip, node_name)
|
||||
self._log(target_node, "tls_certificate", **cert_fields)
|
||||
69
decnet/sniffer/syslog.py
Normal file
69
decnet/sniffer/syslog.py
Normal file
@@ -0,0 +1,69 @@
|
||||
"""
|
||||
RFC 5424 syslog formatting and log-file writing for the fleet sniffer.
|
||||
|
||||
Reuses the same wire format as templates/sniffer/decnet_logging.py so the
|
||||
existing collector parser and ingester can consume events without changes.
|
||||
"""
|
||||
|
||||
import json
|
||||
from datetime import datetime, timezone
|
||||
from pathlib import Path
|
||||
from typing import Any
|
||||
|
||||
from decnet.collector.worker import parse_rfc5424
|
||||
|
||||
# ─── Constants (must match templates/sniffer/decnet_logging.py) ──────────────
|
||||
|
||||
_FACILITY_LOCAL0 = 16
|
||||
_SD_ID = "decnet@55555"
|
||||
_NILVALUE = "-"
|
||||
|
||||
SEVERITY_INFO = 6
|
||||
SEVERITY_WARNING = 4
|
||||
|
||||
_MAX_HOSTNAME = 255
|
||||
_MAX_APPNAME = 48
|
||||
_MAX_MSGID = 32
|
||||
|
||||
|
||||
# ─── Formatter ───────────────────────────────────────────────────────────────
|
||||
|
||||
def _sd_escape(value: str) -> str:
|
||||
return value.replace("\\", "\\\\").replace('"', '\\"').replace("]", "\\]")
|
||||
|
||||
|
||||
def _sd_element(fields: dict[str, Any]) -> str:
|
||||
if not fields:
|
||||
return _NILVALUE
|
||||
params = " ".join(f'{k}="{_sd_escape(str(v))}"' for k, v in fields.items())
|
||||
return f"[{_SD_ID} {params}]"
|
||||
|
||||
|
||||
def syslog_line(
|
||||
service: str,
|
||||
hostname: str,
|
||||
event_type: str,
|
||||
severity: int = SEVERITY_INFO,
|
||||
msg: str | None = None,
|
||||
**fields: Any,
|
||||
) -> str:
|
||||
pri = f"<{_FACILITY_LOCAL0 * 8 + severity}>"
|
||||
ts = datetime.now(timezone.utc).isoformat()
|
||||
host = (hostname or _NILVALUE)[:_MAX_HOSTNAME]
|
||||
appname = (service or _NILVALUE)[:_MAX_APPNAME]
|
||||
msgid = (event_type or _NILVALUE)[:_MAX_MSGID]
|
||||
sd = _sd_element(fields)
|
||||
message = f" {msg}" if msg else ""
|
||||
return f"{pri}1 {ts} {host} {appname} {_NILVALUE} {msgid} {sd}{message}"
|
||||
|
||||
|
||||
def write_event(line: str, log_path: Path, json_path: Path) -> None:
|
||||
"""Append a syslog line to the raw log and its parsed JSON to the json log."""
|
||||
with open(log_path, "a", encoding="utf-8") as lf:
|
||||
lf.write(line + "\n")
|
||||
lf.flush()
|
||||
parsed = parse_rfc5424(line)
|
||||
if parsed:
|
||||
with open(json_path, "a", encoding="utf-8") as jf:
|
||||
jf.write(json.dumps(parsed) + "\n")
|
||||
jf.flush()
|
||||
145
decnet/sniffer/worker.py
Normal file
145
decnet/sniffer/worker.py
Normal file
@@ -0,0 +1,145 @@
|
||||
"""
|
||||
Fleet-wide MACVLAN sniffer worker.
|
||||
|
||||
Runs as a single host-side async background task that sniffs all TLS
|
||||
traffic on the MACVLAN host interface. Maps packets to deckies by IP
|
||||
and feeds fingerprint events into the existing log pipeline.
|
||||
|
||||
Modeled on decnet.collector.worker — same lifecycle pattern.
|
||||
Fault-isolated: any exception is logged and the worker exits cleanly.
|
||||
The API never depends on this worker being alive.
|
||||
"""
|
||||
|
||||
import asyncio
|
||||
import os
|
||||
import subprocess
|
||||
import threading
|
||||
import time
|
||||
from pathlib import Path
|
||||
from typing import Any
|
||||
|
||||
from decnet.logging import get_logger
|
||||
from decnet.network import HOST_MACVLAN_IFACE
|
||||
from decnet.sniffer.fingerprint import SnifferEngine
|
||||
from decnet.sniffer.syslog import write_event
|
||||
|
||||
logger = get_logger("sniffer")
|
||||
|
||||
_IP_MAP_REFRESH_INTERVAL: float = 60.0
|
||||
|
||||
|
||||
def _load_ip_to_decky() -> dict[str, str]:
|
||||
"""Build IP → decky-name mapping from decnet-state.json."""
|
||||
from decnet.config import load_state
|
||||
state = load_state()
|
||||
if state is None:
|
||||
return {}
|
||||
config, _ = state
|
||||
mapping: dict[str, str] = {}
|
||||
for decky in config.deckies:
|
||||
mapping[decky.ip] = decky.name
|
||||
return mapping
|
||||
|
||||
|
||||
def _interface_exists(iface: str) -> bool:
|
||||
"""Check if a network interface exists on this host."""
|
||||
try:
|
||||
result = subprocess.run(
|
||||
["ip", "link", "show", iface],
|
||||
capture_output=True, text=True, check=False,
|
||||
)
|
||||
return result.returncode == 0
|
||||
except Exception:
|
||||
return False
|
||||
|
||||
|
||||
def _sniff_loop(
|
||||
interface: str,
|
||||
log_path: Path,
|
||||
json_path: Path,
|
||||
stop_event: threading.Event,
|
||||
) -> None:
|
||||
"""Blocking sniff loop. Runs in a dedicated thread via asyncio.to_thread."""
|
||||
try:
|
||||
from scapy.sendrecv import sniff
|
||||
except ImportError:
|
||||
logger.error("scapy not installed — sniffer cannot start")
|
||||
return
|
||||
|
||||
ip_map = _load_ip_to_decky()
|
||||
if not ip_map:
|
||||
logger.warning("sniffer: no deckies in state — nothing to sniff")
|
||||
return
|
||||
|
||||
def _write_fn(line: str) -> None:
|
||||
write_event(line, log_path, json_path)
|
||||
|
||||
engine = SnifferEngine(ip_to_decky=ip_map, write_fn=_write_fn)
|
||||
|
||||
# Periodically refresh IP map in a background daemon thread
|
||||
def _refresh_loop() -> None:
|
||||
while not stop_event.is_set():
|
||||
stop_event.wait(_IP_MAP_REFRESH_INTERVAL)
|
||||
if stop_event.is_set():
|
||||
break
|
||||
try:
|
||||
new_map = _load_ip_to_decky()
|
||||
if new_map:
|
||||
engine.update_ip_map(new_map)
|
||||
except Exception as exc:
|
||||
logger.debug("sniffer: ip map refresh failed: %s", exc)
|
||||
|
||||
refresh_thread = threading.Thread(target=_refresh_loop, daemon=True)
|
||||
refresh_thread.start()
|
||||
|
||||
logger.info("sniffer: sniffing on interface=%s deckies=%d", interface, len(ip_map))
|
||||
|
||||
try:
|
||||
sniff(
|
||||
iface=interface,
|
||||
filter="tcp",
|
||||
prn=engine.on_packet,
|
||||
store=False,
|
||||
stop_filter=lambda pkt: stop_event.is_set(),
|
||||
)
|
||||
except Exception as exc:
|
||||
logger.error("sniffer: scapy sniff exited: %s", exc)
|
||||
finally:
|
||||
stop_event.set()
|
||||
logger.info("sniffer: sniff loop ended")
|
||||
|
||||
|
||||
async def sniffer_worker(log_file: str) -> None:
|
||||
"""
|
||||
Async entry point — started as asyncio.create_task in the API lifespan.
|
||||
|
||||
Fully fault-isolated: catches all exceptions, logs them, and returns
|
||||
cleanly. The API continues running regardless of sniffer state.
|
||||
"""
|
||||
try:
|
||||
interface = os.environ.get("DECNET_SNIFFER_IFACE", HOST_MACVLAN_IFACE)
|
||||
|
||||
if not _interface_exists(interface):
|
||||
logger.warning(
|
||||
"sniffer: interface %s not found — sniffer disabled "
|
||||
"(fleet may not be deployed yet)", interface,
|
||||
)
|
||||
return
|
||||
|
||||
log_path = Path(log_file)
|
||||
json_path = log_path.with_suffix(".json")
|
||||
log_path.parent.mkdir(parents=True, exist_ok=True)
|
||||
|
||||
stop_event = threading.Event()
|
||||
|
||||
try:
|
||||
await asyncio.to_thread(_sniff_loop, interface, log_path, json_path, stop_event)
|
||||
except asyncio.CancelledError:
|
||||
logger.info("sniffer: shutdown requested")
|
||||
stop_event.set()
|
||||
raise
|
||||
|
||||
except asyncio.CancelledError:
|
||||
raise
|
||||
except Exception as exc:
|
||||
logger.error("sniffer: worker failed — API continues without sniffing: %s", exc)
|
||||
Reference in New Issue
Block a user