feat(dlp): add server-side analyzer, evidence chain, compliance scheduler, and syslog forwarder

aw-server/dlp-integrations/syslog_forwarder.py

@@ -0,0 +1,142 @@
+#!/usr/bin/env python3
+from __future__ import annotations
+
+import json
+import logging
+import socket
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Any
+from urllib import error, request
+
+import yaml
+
+LOG = logging.getLogger("aw.dlp.syslog_forwarder")
+
+
+def setup_logging() -> None:
+    logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")
+
+
+def load_yaml(path: Path) -> dict[str, Any]:
+    if not path.exists():
+        return {}
+    data = yaml.safe_load(path.read_text(encoding="utf-8")) or {}
+    return data if isinstance(data, dict) else {}
+
+
+def load_json(path: Path) -> dict[str, Any]:
+    if not path.exists():
+        return {}
+    try:
+        data = json.loads(path.read_text(encoding="utf-8"))
+    except Exception:
+        return {}
+    return data if isinstance(data, dict) else {}
+
+
+def save_json(path: Path, payload: dict[str, Any]) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(json.dumps(payload, ensure_ascii=False, indent=2), encoding="utf-8")
+
+
+def http_json(url: str, timeout: int = 15) -> Any:
+    req = request.Request(url, method="GET")
+    with request.urlopen(req, timeout=timeout) as resp:
+        return json.loads(resp.read().decode("utf-8", errors="ignore"))
+
+
+def iter_new_incidents(aw_base: str, state: dict[str, Any], per_bucket_limit: int) -> tuple[list[dict[str, Any]], dict[str, int]]:
+    buckets = http_json(f"{aw_base}/buckets/")
+    bucket_ids = sorted([bid for bid in buckets.keys() if bid.startswith("aw-dlp-incidents_")])
+    last_ids = state.get("last_ids", {})
+    if not isinstance(last_ids, dict):
+        last_ids = {}
+    max_ids: dict[str, int] = {}
+    out: list[dict[str, Any]] = []
+    for bid in bucket_ids:
+        try:
+            events = http_json(f"{aw_base}/buckets/{bid}/events?limit={int(per_bucket_limit)}")
+        except error.HTTPError as exc:
+            LOG.warning("skip bucket %s: %s", bid, exc)
+            continue
+        prev = int(last_ids.get(bid, 0))
+        bucket_max = prev
+        for ev in events:
+            eid = int(ev.get("id") or 0)
+            if eid <= prev:
+                continue
+            out.append(ev)
+            if eid > bucket_max:
+                bucket_max = eid
+        max_ids[bid] = bucket_max
+    out.sort(key=lambda x: int(x.get("id") or 0))
+    return out, max_ids
+
+
+def build_message(event: dict[str, Any], app_name: str, facility: int) -> str:
+    pri = facility * 8 + 6
+    ts = datetime.now(timezone.utc).isoformat().replace("+00:00", "Z")
+    data = event.get("data") or {}
+    host = str(data.get("hostname") or "unknown")
+    payload = json.dumps(
+        {
+            "event_id": event.get("id"),
+            "timestamp": event.get("timestamp"),
+            "host": host,
+            "severity": data.get("severity"),
+            "signalType": data.get("signalType"),
+            "username": data.get("username"),
+            "action": data.get("action"),
+            "message": data.get("message"),
+            "data": data,
+        },
+        ensure_ascii=False,
+        separators=(",", ":"),
+    )
+    return f"<{pri}>1 {ts} {host} {app_name} - - - {payload}"
+
+
+def send_syslog(line: str, host: str, port: int, proto: str, timeout: int = 10) -> None:
+    if proto.lower() == "tcp":
+        sock = socket.create_connection((host, port), timeout=timeout)
+        try:
+            sock.sendall((line + "\n").encode("utf-8", errors="ignore"))
+        finally:
+            sock.close()
+        return
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    try:
+        sock.sendto(line.encode("utf-8", errors="ignore"), (host, port))
+    finally:
+        sock.close()
+
+
+def main() -> None:
+    setup_logging()
+    cfg_path = Path("/opt/activitywatch/dlp-integrations/syslog-forwarder-config.yaml")
+    cfg = load_yaml(cfg_path)
+    aw_base = str(cfg.get("aw_api_base", "http://127.0.0.1:5600/api/0")).rstrip("/")
+    state_path = Path(str(cfg.get("state_path", "/var/lib/activitywatch/dlp-integrations/syslog-forwarder-state.json")))
+    per_bucket_limit = int(cfg.get("per_bucket_limit", 300))
+    syslog_host = str(cfg.get("syslog_host", "127.0.0.1"))
+    syslog_port = int(cfg.get("syslog_port", 514))
+    syslog_proto = str(cfg.get("syslog_proto", "udp"))
+    facility = int(cfg.get("facility", 16))
+    app_name = str(cfg.get("app_name", "aw-dlp"))
+
+    state = load_json(state_path)
+    incidents, max_ids = iter_new_incidents(aw_base=aw_base, state=state, per_bucket_limit=per_bucket_limit)
+
+    sent = 0
+    for event in incidents:
+        line = build_message(event, app_name=app_name, facility=facility)
+        send_syslog(line=line, host=syslog_host, port=syslog_port, proto=syslog_proto)
+        sent += 1
+
+    save_json(state_path, {"last_ids": max_ids})
+    LOG.info("syslog forwarder sent=%d buckets=%d", sent, len(max_ids))
+
+
+if __name__ == "__main__":
+    main()