anti
ea340065c6
Extend the passive TLS sniffer with next-gen attacker fingerprinting: - JA4 (ClientHello) and JA4S (ServerHello) computation with supported_versions, signature_algorithms, and ALPN parsing - JA4L latency measurement via TCP SYN→SYN-ACK RTT tracking - TLS session resumption detection (session tickets, PSK, 0-RTT early data) - Certificate extraction for TLS ≤1.2 with minimal DER/ASN.1 parser (subject CN, issuer, SANs, validity period, self-signed flag) - Ingester bounty extraction for all new fingerprint types - 116 tests covering all new functionality (1255 total passing)
205 lines
7.5 KiB
Python
205 lines
7.5 KiB
Python
import asyncio
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import os
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import json
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from typing import Any
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from pathlib import Path
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from decnet.logging import get_logger
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from decnet.web.db.repository import BaseRepository
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logger = get_logger("api")
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async def log_ingestion_worker(repo: BaseRepository) -> None:
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"""
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Background task that tails the DECNET_INGEST_LOG_FILE.json and
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inserts structured JSON logs into the SQLite repository.
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"""
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_base_log_file: str | None = os.environ.get("DECNET_INGEST_LOG_FILE")
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if not _base_log_file:
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logger.warning("DECNET_INGEST_LOG_FILE not set. Log ingestion disabled.")
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return
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_json_log_path: Path = Path(_base_log_file).with_suffix(".json")
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_position: int = 0
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logger.info("ingest worker started path=%s", _json_log_path)
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while True:
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try:
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if not _json_log_path.exists():
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await asyncio.sleep(2)
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continue
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_stat: os.stat_result = _json_log_path.stat()
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if _stat.st_size < _position:
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# File rotated or truncated
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_position = 0
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if _stat.st_size == _position:
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# No new data
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await asyncio.sleep(1)
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continue
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with open(_json_log_path, "r", encoding="utf-8", errors="replace") as _f:
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_f.seek(_position)
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while True:
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_line: str = _f.readline()
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if not _line:
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break # EOF reached
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if not _line.endswith('\n'):
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# Partial line read, don't process yet, don't advance position
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break
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try:
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_log_data: dict[str, Any] = json.loads(_line.strip())
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logger.debug("ingest: record decky=%s event_type=%s", _log_data.get("decky"), _log_data.get("event_type"))
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await repo.add_log(_log_data)
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await _extract_bounty(repo, _log_data)
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except json.JSONDecodeError:
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logger.error("ingest: failed to decode JSON log line: %s", _line.strip())
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continue
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# Update position after successful line read
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_position = _f.tell()
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except Exception as _e:
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_err_str = str(_e).lower()
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if "no such table" in _err_str or "no active connection" in _err_str or "connection closed" in _err_str:
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logger.error("ingest: post-shutdown or fatal DB error: %s", _e)
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break # Exit worker — DB is gone or uninitialized
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logger.error("ingest: error in worker: %s", _e)
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await asyncio.sleep(5)
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await asyncio.sleep(1)
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async def _extract_bounty(repo: BaseRepository, log_data: dict[str, Any]) -> None:
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"""Detect and extract valuable artifacts (bounties) from log entries."""
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_fields = log_data.get("fields")
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if not isinstance(_fields, dict):
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return
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# 1. Credentials (User/Pass)
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_user = _fields.get("username")
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_pass = _fields.get("password")
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if _user and _pass:
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await repo.add_bounty({
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"decky": log_data.get("decky"),
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"service": log_data.get("service"),
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"attacker_ip": log_data.get("attacker_ip"),
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"bounty_type": "credential",
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"payload": {
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"username": _user,
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"password": _pass
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}
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})
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# 2. HTTP User-Agent fingerprint
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_headers = _fields.get("headers") if isinstance(_fields.get("headers"), dict) else {}
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_ua = _headers.get("User-Agent") or _headers.get("user-agent")
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if _ua:
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await repo.add_bounty({
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"decky": log_data.get("decky"),
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"service": log_data.get("service"),
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"attacker_ip": log_data.get("attacker_ip"),
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"bounty_type": "fingerprint",
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"payload": {
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"fingerprint_type": "http_useragent",
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"value": _ua,
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"method": _fields.get("method"),
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"path": _fields.get("path"),
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}
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})
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# 3. VNC client version fingerprint
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_vnc_ver = _fields.get("client_version")
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if _vnc_ver and log_data.get("event_type") == "version":
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await repo.add_bounty({
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"decky": log_data.get("decky"),
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"service": log_data.get("service"),
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"attacker_ip": log_data.get("attacker_ip"),
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"bounty_type": "fingerprint",
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"payload": {
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"fingerprint_type": "vnc_client_version",
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"value": _vnc_ver,
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}
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})
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# 4. SSH client banner fingerprint (deferred — requires asyncssh server)
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# Fires on: service=ssh, event_type=client_banner, fields.client_banner
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# 5. JA3/JA3S TLS fingerprint from sniffer container
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_ja3 = _fields.get("ja3")
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if _ja3 and log_data.get("service") == "sniffer":
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await repo.add_bounty({
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"decky": log_data.get("decky"),
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"service": "sniffer",
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"attacker_ip": log_data.get("attacker_ip"),
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"bounty_type": "fingerprint",
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"payload": {
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"fingerprint_type": "ja3",
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"ja3": _ja3,
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"ja3s": _fields.get("ja3s"),
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"ja4": _fields.get("ja4"),
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"ja4s": _fields.get("ja4s"),
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"tls_version": _fields.get("tls_version"),
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"sni": _fields.get("sni") or None,
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"alpn": _fields.get("alpn") or None,
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"dst_port": _fields.get("dst_port"),
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"raw_ciphers": _fields.get("raw_ciphers"),
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"raw_extensions": _fields.get("raw_extensions"),
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},
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})
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# 6. JA4L latency fingerprint from sniffer
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_ja4l_rtt = _fields.get("ja4l_rtt_ms")
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if _ja4l_rtt and log_data.get("service") == "sniffer":
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await repo.add_bounty({
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"decky": log_data.get("decky"),
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"service": "sniffer",
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"attacker_ip": log_data.get("attacker_ip"),
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"bounty_type": "fingerprint",
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"payload": {
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"fingerprint_type": "ja4l",
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"rtt_ms": _ja4l_rtt,
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"client_ttl": _fields.get("ja4l_client_ttl"),
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},
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})
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# 7. TLS session resumption behavior
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_resumption = _fields.get("resumption")
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if _resumption and log_data.get("service") == "sniffer":
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await repo.add_bounty({
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"decky": log_data.get("decky"),
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"service": "sniffer",
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"attacker_ip": log_data.get("attacker_ip"),
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"bounty_type": "fingerprint",
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"payload": {
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"fingerprint_type": "tls_resumption",
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"mechanisms": _resumption,
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},
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})
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# 8. TLS certificate details (TLS 1.2 only — passive extraction)
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_subject_cn = _fields.get("subject_cn")
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if _subject_cn and log_data.get("service") == "sniffer":
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await repo.add_bounty({
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"decky": log_data.get("decky"),
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"service": "sniffer",
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"attacker_ip": log_data.get("attacker_ip"),
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"bounty_type": "fingerprint",
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"payload": {
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"fingerprint_type": "tls_certificate",
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"subject_cn": _subject_cn,
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"issuer": _fields.get("issuer"),
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"self_signed": _fields.get("self_signed"),
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"not_before": _fields.get("not_before"),
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"not_after": _fields.get("not_after"),
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"sans": _fields.get("sans"),
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"sni": _fields.get("sni") or None,
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},
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})
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