""" Host-side Docker log collector. Streams stdout from all running decky service containers via the Docker SDK, writes RFC 5424 lines to and parsed JSON records to .json. The ingester tails the .json file; rsyslog can consume the .log file independently. """ import asyncio import contextlib import json import os import re import threading import time from concurrent.futures import ThreadPoolExecutor from datetime import datetime from pathlib import Path from typing import Any, Callable, Optional from decnet.bus import topics as _topics from decnet.bus.factory import get_bus from decnet.bus.publish import ( make_thread_safe_publisher, run_control_listener_signal, run_health_heartbeat, ) from decnet.logging import get_logger from decnet.telemetry import traced as _traced, get_tracer as _get_tracer, inject_context as _inject_ctx # Collector publish signature: ``publish_fn(parsed_event_dict)``. Callable # from the container-stream threads; the worker wraps it around a thread-safe # bus publisher that marshals onto the asyncio loop. CollectorPublishFn = Callable[[dict[str, Any]], None] logger = get_logger("collector") # ─── Ingestion rate limiter ─────────────────────────────────────────────────── # # Rationale: connection-lifecycle events (connect/disconnect/accept/close) are # emitted once per TCP connection. During a portscan or credential-stuffing # run, a single attacker can generate hundreds of these per second from the # honeypot services themselves — each becoming a tiny WAL-write transaction # through the ingester, starving reads until the queue drains. # # The collector still writes every line to the raw .log file (forensic record # for rsyslog/SIEM). Only the .json path — which feeds SQLite — is deduped. # # Dedup key: (attacker_ip, decky, service, event_type) # Window: DECNET_COLLECTOR_RL_WINDOW_SEC seconds (default 1.0) # Scope: DECNET_COLLECTOR_RL_EVENT_TYPES comma list # (default: connect,disconnect,connection,accept,close) # Events outside that set bypass the limiter untouched. def _parse_float_env(name: str, default: float) -> float: raw = os.environ.get(name) if raw is None: return default try: value = float(raw) except ValueError: logger.warning("collector: invalid %s=%r, using default %s", name, raw, default) return default return max(0.0, value) _RL_WINDOW_SEC: float = _parse_float_env("DECNET_COLLECTOR_RL_WINDOW_SEC", 1.0) _RL_EVENT_TYPES: frozenset[str] = frozenset( t.strip() for t in os.environ.get( "DECNET_COLLECTOR_RL_EVENT_TYPES", "connect,disconnect,connection,accept,close", ).split(",") if t.strip() ) _RL_MAX_ENTRIES: int = 10_000 _rl_lock: threading.Lock = threading.Lock() _rl_last: dict[tuple[str, str, str, str], float] = {} def _should_ingest(parsed: dict[str, Any]) -> bool: """ Return True if this parsed event should be written to the JSON ingestion stream. Rate-limited connection-lifecycle events return False when another event with the same (attacker_ip, decky, service, event_type) was emitted inside the dedup window. """ event_type = parsed.get("event_type", "") if _RL_WINDOW_SEC <= 0.0 or event_type not in _RL_EVENT_TYPES: return True key = ( parsed.get("attacker_ip", "Unknown"), parsed.get("decky", ""), parsed.get("service", ""), event_type, ) now = time.monotonic() with _rl_lock: last = _rl_last.get(key, 0.0) if now - last < _RL_WINDOW_SEC: return False _rl_last[key] = now # Opportunistic GC: when the map grows past the cap, drop entries older # than 60 windows (well outside any realistic in-flight dedup range). if len(_rl_last) > _RL_MAX_ENTRIES: cutoff = now - (_RL_WINDOW_SEC * 60.0) stale = [k for k, t in _rl_last.items() if t < cutoff] for k in stale: del _rl_last[k] return True def _reset_rate_limiter() -> None: """Test-only helper — clear dedup state between test cases.""" with _rl_lock: _rl_last.clear() # ─── RFC 5424 parser ────────────────────────────────────────────────────────── _RFC5424_RE = re.compile( r"^<\d+>1 " r"(\S+) " # 1: TIMESTAMP r"(\S+) " # 2: HOSTNAME (decky name) r"(\S+) " # 3: APP-NAME (service) r"\S+ " # PROCID — NILVALUE ("-") for syslog_bridge emitters, # real PID for native syslog callers like sshd/sudo # routed through rsyslog. Accept both; we don't consume it. r"(\S+) " # 4: MSGID (event_type) r"(.+)$", # 5: SD element + optional MSG ) _SD_BLOCK_RE = re.compile(r'\[relay@55555\s+(.*?)\]', re.DOTALL) _PARAM_RE = re.compile(r'(\w+)="((?:[^"\\]|\\.)*)"') _IP_FIELDS = ("src_ip", "src", "client_ip", "remote_ip", "remote_addr", "target_ip", "ip") # Free-form `key=value` pairs in the MSG body. Used for lines that bypass the # syslog_bridge SD format — e.g. the SSH container's PROMPT_COMMAND which # calls `logger -t bash "CMD uid=0 user=root src=1.2.3.4 pwd=/root cmd=…"`. # Values run until the next whitespace, so `cmd=…` at end-of-line is preserved # as one unit; we only care about IP-shaped fields here anyway. _MSG_KV_RE = re.compile(r'(\w+)=(\S+)') def parse_rfc5424(line: str) -> Optional[dict[str, Any]]: """ Parse an RFC 5424 DECNET log line into a structured dict. Returns None if the line does not match the expected format. """ m = _RFC5424_RE.match(line) if not m: return None ts_raw, decky, service, event_type, sd_rest = m.groups() fields: dict[str, str] = {} msg: str = "" if sd_rest.startswith("-"): msg = sd_rest[1:].lstrip() elif sd_rest.startswith("["): block = _SD_BLOCK_RE.search(sd_rest) if block: for k, v in _PARAM_RE.findall(block.group(1)): fields[k] = v.replace('\\"', '"').replace("\\\\", "\\").replace("\\]", "]") msg_match = re.search(r'\]\s+(.+)$', sd_rest) if msg_match: msg = msg_match.group(1).strip() else: msg = sd_rest attacker_ip = "Unknown" for fname in _IP_FIELDS: if fname in fields: attacker_ip = fields[fname] break # Fallback for plain `logger` callers that don't use SD params (notably # the SSH container's bash PROMPT_COMMAND: `logger -t bash "CMD … src=IP …"`). # Scan the MSG body for IP-shaped `key=value` tokens ONLY — don't fold # them into `fields`, because the frontend's parseEventBody already # renders kv pairs from the msg and doubling them up produces noisy # duplicate pills. This keeps attacker attribution working without # changing the shape of `fields` for non-SD lines. if attacker_ip == "Unknown" and msg: for k, v in _MSG_KV_RE.findall(msg): if k in _IP_FIELDS: attacker_ip = v break try: ts_formatted = datetime.fromisoformat(ts_raw).strftime("%Y-%m-%d %H:%M:%S") except ValueError: ts_formatted = ts_raw return { "timestamp": ts_formatted, "decky": decky, "service": service, "event_type": event_type, "attacker_ip": attacker_ip, "fields": fields, "msg": msg, "raw_line": line, } # ─── Container helpers ──────────────────────────────────────────────────────── def _load_service_container_names() -> set[str]: """ Return the exact set of service container names from decnet-state.json. Format: {decky_name}-{service_name}, e.g. 'omega-decky-smtp'. Returns an empty set if no state file exists. """ from decnet.config import load_state state = load_state() if state is None: return set() config, _ = state names: set[str] = set() for decky in config.deckies: for svc in decky.services: names.add(f"{decky.name}-{svc.replace('_', '-')}") return names _TOPOLOGY_SERVICE_LABEL = "decnet.topology.service" def _has_topology_service_label(labels: Optional[dict]) -> bool: """MazeNET topology containers are tagged at compose-time (see ``decnet/topology/compose.py``) so the collector can discover them without consulting ``decnet-state.json`` — that state file only knows about legacy fleet deckies.""" if not labels: return False return labels.get(_TOPOLOGY_SERVICE_LABEL) == "true" def is_service_container(container) -> bool: """Return True if this Docker container is a known DECNET service container.""" if isinstance(container, str): return container.lstrip("/") in _load_service_container_names() name = container.name.lstrip("/") if name in _load_service_container_names(): return True # MazeNET topology containers aren't in decnet-state.json — discover # them via compose-time labels instead. Tolerant to stub objects # that don't expose .attrs/.labels (unit tests). labels: Optional[dict] = None attrs = getattr(container, "attrs", None) if isinstance(attrs, dict): labels = (attrs.get("Config") or {}).get("Labels") if labels is None: labels = getattr(container, "labels", None) return _has_topology_service_label(labels) def is_service_event(attrs: dict) -> bool: """Return True if a Docker start event is for a known DECNET service container.""" name = attrs.get("name", "").lstrip("/") if name in _load_service_container_names(): return True # Docker start-event attrs contains every container label flat alongside # 'name' / 'image' — no separate 'labels' sub-dict. return attrs.get(_TOPOLOGY_SERVICE_LABEL) == "true" # ─── Blocking stream worker (runs in a thread) ──────────────────────────────── def _reopen_if_needed(path: Path, fh: Optional[Any]) -> Any: """Return fh if it still points to the same inode as path; otherwise close fh and open a fresh handle. Handles the file being deleted (manual rm) or rotated (logrotate rename + create).""" try: if fh is not None and os.fstat(fh.fileno()).st_ino == os.stat(path).st_ino: return fh except OSError: pass # File gone or inode changed — close stale handle and open a new one. if fh is not None: try: fh.close() except Exception: # nosec B110 — best-effort file handle cleanup pass path.parent.mkdir(parents=True, exist_ok=True) return open(path, "a", encoding="utf-8") @_traced("collector.stream_container") def _stream_container( container_id: str, log_path: Path, json_path: Path, publish_fn: CollectorPublishFn | None = None, ) -> None: """Stream logs from one container and append to the host log files.""" import docker # type: ignore[import] lf: Optional[Any] = None jf: Optional[Any] = None try: client = docker.from_env() container = client.containers.get(container_id) log_stream = container.logs(stream=True, follow=True, stdout=True, stderr=False) buf = "" for chunk in log_stream: buf += chunk.decode("utf-8", errors="replace") while "\n" in buf: line, buf = buf.split("\n", 1) line = line.rstrip() if not line: continue lf = _reopen_if_needed(log_path, lf) lf.write(line + "\n") lf.flush() parsed = parse_rfc5424(line) if parsed: if _should_ingest(parsed): _tracer = _get_tracer("collector") with _tracer.start_as_current_span("collector.event") as _span: _span.set_attribute("decky", parsed.get("decky", "")) _span.set_attribute("service", parsed.get("service", "")) _span.set_attribute("event_type", parsed.get("event_type", "")) _span.set_attribute("attacker_ip", parsed.get("attacker_ip", "")) _inject_ctx(parsed) logger.debug("collector: event written decky=%s type=%s", parsed.get("decky"), parsed.get("event_type")) jf = _reopen_if_needed(json_path, jf) jf.write(json.dumps(parsed) + "\n") jf.flush() if publish_fn is not None: try: publish_fn(parsed) except Exception as exc: logger.debug( "collector: bus publish failed: %s", exc, ) else: logger.debug( "collector: rate-limited decky=%s service=%s type=%s attacker=%s", parsed.get("decky"), parsed.get("service"), parsed.get("event_type"), parsed.get("attacker_ip"), ) else: logger.debug("collector: malformed RFC5424 line snippet=%r", line[:80]) except Exception as exc: logger.debug("collector: log stream ended container_id=%s reason=%s", container_id, exc) finally: for fh in (lf, jf): if fh is not None: try: fh.close() except Exception: # nosec B110 — best-effort file handle cleanup pass # ─── Bus plumbing ───────────────────────────────────────────────────────────── def _make_system_log_publisher( bus: Any, loop: asyncio.AbstractEventLoop, ) -> CollectorPublishFn: """Factory: returns a ``publish_fn(parsed)`` for use by stream threads. When *bus* is ``None`` the returned callable is a no-op, so the stream thread can call it unconditionally. Otherwise each call is marshalled onto *loop* (the asyncio event loop that owns the bus socket) via ``make_thread_safe_publisher``. """ raw_publish = make_thread_safe_publisher(bus, loop) if bus is not None else None if raw_publish is None: return lambda _parsed: None topic = _topics.system(_topics.SYSTEM_LOG) def _publish(parsed: dict[str, Any]) -> None: event_type = parsed.get("event_type", "") raw_publish( topic, { "decky": parsed.get("decky", ""), "service": parsed.get("service", ""), "event_type": event_type, "attacker_ip": parsed.get("attacker_ip", "Unknown"), "timestamp": parsed.get("timestamp", ""), }, event_type, ) return _publish # ─── Async collector ────────────────────────────────────────────────────────── async def log_collector_worker(log_file: str) -> None: """ Background task: streams Docker logs from all running decky service containers, writing RFC 5424 lines to log_file and parsed JSON records to log_file.json for the ingester to consume. Watches Docker events to pick up containers started after initial scan. """ import docker # type: ignore[import] log_path = Path(log_file) json_path = log_path.with_suffix(".json") log_path.parent.mkdir(parents=True, exist_ok=True) active: dict[str, asyncio.Task[None]] = {} loop = asyncio.get_running_loop() # Optional bus wiring — per-line system.log publish. Fan-in from many # container-stream threads is handled by make_thread_safe_publisher, # which marshals each publish onto this loop. bus = None try: bus = get_bus(client_name="collector") await bus.connect() except Exception as exc: logger.warning("collector: bus unavailable, continuing without publish: %s", exc) bus = None _publish_log = _make_system_log_publisher(bus, loop) # Workers panel health heartbeat + bus-driven stop control. The # heartbeat beacons on system.collector.health every 30s; the # control listener translates a bus stop intent into a SIGTERM to # this process (collector's main loop is a blocking thread pool, so # self-signalling is cleaner than threading a shutdown event). heartbeat_task = asyncio.create_task(run_health_heartbeat(bus, "collector")) control_task = asyncio.create_task(run_control_listener_signal(bus, "collector")) # Dedicated thread pool so long-running container log streams don't # saturate the default asyncio executor and starve short-lived # to_thread() calls elsewhere (e.g. load_state in the web API). collector_pool = ThreadPoolExecutor( max_workers=64, thread_name_prefix="decnet-collector", ) def _spawn(container_id: str, container_name: str) -> None: if container_id not in active or active[container_id].done(): active[container_id] = asyncio.ensure_future( loop.run_in_executor( collector_pool, _stream_container, container_id, log_path, json_path, _publish_log, ), loop=loop, ) logger.info("collector: streaming container=%s", container_name) try: logger.info("collector started log_path=%s", log_path) client = docker.from_env() for container in client.containers.list(): if is_service_container(container): _spawn(container.id, container.name.lstrip("/")) def _watch_events() -> None: for event in client.events( decode=True, filters={"type": "container", "event": "start"}, ): attrs = event.get("Actor", {}).get("Attributes", {}) cid = event.get("id", "") name = attrs.get("name", "") if cid and is_service_event(attrs): loop.call_soon_threadsafe(_spawn, cid, name) await loop.run_in_executor(collector_pool, _watch_events) except asyncio.CancelledError: logger.info("collector shutdown requested cancelling %d tasks", len(active)) for task in active.values(): task.cancel() collector_pool.shutdown(wait=False) raise except Exception as exc: logger.error("collector error: %s", exc) finally: collector_pool.shutdown(wait=False) for t in (heartbeat_task, control_task): t.cancel() with contextlib.suppress(Exception, asyncio.CancelledError): await t if bus is not None: with contextlib.suppress(Exception): await bus.close()