feat(dlp): implement SIEM/SOAR integrations (CEF, webhook, syslog, systemd timers)

2026-05-13 02:30:52 +03:00
parent 067457198d
commit fd2e9ac59d
15 changed files with 563 additions and 33 deletions
@@ -3,23 +3,87 @@ from __future__ import annotations

 import json
 import logging
-import os
 import socket
 from datetime import datetime, timezone
+from pathlib import Path
+from typing import Any
+from urllib import error, request

-logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")
+import yaml
+
+LOG = logging.getLogger("aw.dlp.cef_exporter")


-def build_cef(event: dict) -> str:
-    sev_map = {"low": 3, "medium": 6, "high": 10}
-    sev = sev_map.get(event.get("severity", "low"), 3)
-    ts = datetime.now(timezone.utc).isoformat()
-    msg = event.get("message", "")
-    host = event.get("hostname", "unknown")
-    return f"CEF:0|AWatch-rus|DLP|1.0|{event.get('id','dlp')}|{msg}|{sev}|rt={ts} shost={host}"
+def setup_logging() -> None:
+    logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")


-def send_syslog(line: str, host: str, port: int) -> None:
+def load_yaml(path: Path) -> dict[str, Any]:
+    if not path.exists():
+        return {}
+    data = yaml.safe_load(path.read_text(encoding="utf-8")) or {}
+    if not isinstance(data, dict):
+        return {}
+    return data
+
+
+def load_json(path: Path) -> dict[str, Any]:
+    if not path.exists():
+        return {}
+    try:
+        data = json.loads(path.read_text(encoding="utf-8"))
+        if isinstance(data, dict):
+            return data
+    except Exception:
+        return {}
+    return {}
+
+
+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 escape_cef(v: Any) -> str:
+    s = "" if v is None else str(v)
+    return s.replace("\\", "\\\\").replace("|", "\\|").replace("=", "\\=").replace("\n", "\\n").replace("\r", "")
+
+
+def map_severity(name: str, mapping: dict[str, int]) -> int:
+    return int(mapping.get((name or "").lower(), 3))
+
+
+def build_cef(event: dict[str, Any], mapping: dict[str, int]) -> str:
+    data = event.get("data") or {}
+    sev_name = str(data.get("severity") or "low").lower()
+    sev_num = map_severity(sev_name, mapping)
+    rt = event.get("timestamp") or datetime.now(timezone.utc).isoformat()
+    rule = data.get("ruleId") or "dlp-incident"
+    msg = data.get("message") or "AWatch DLP incident"
+    sig = data.get("signalType") or "unknown"
+    host = data.get("hostname") or "unknown"
+    user = data.get("username") or "unknown"
+    action = data.get("action") or "alert"
+    ext = (
+        f"rt={escape_cef(rt)} "
+        f"shost={escape_cef(host)} "
+        f"suser={escape_cef(user)} "
+        f"cs1Label=signalType cs1={escape_cef(sig)} "
+        f"cs2Label=action cs2={escape_cef(action)} "
+        f"cs3Label=ruleId cs3={escape_cef(rule)}"
+    )
+    return (
+        f"CEF:0|AWatch-rus|DLP|1.0|{escape_cef(rule)}|{escape_cef(msg)}|{sev_num}|{ext}"
+    )
+
+
+def send_syslog_udp(line: str, host: str, port: int) -> None:
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    try:
        sock.sendto(line.encode("utf-8", errors="ignore"), (host, port))
@@ -27,14 +91,74 @@ def send_syslog(line: str, host: str, port: int) -> None:
        sock.close()


+def send_syslog_tcp(line: str, host: str, port: int, timeout: int = 10) -> None:
+    sock = socket.create_connection((host, port), timeout=timeout)
+    try:
+        sock.sendall((line + "\n").encode("utf-8", errors="ignore"))
+    finally:
+        sock.close()
+
+
+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 main() -> None:
-    sample = os.environ.get("AW_DLP_CEF_SAMPLE", "")
-    event = json.loads(sample) if sample else {"id": "startup", "message": "cef exporter heartbeat", "severity": "low"}
-    line = build_cef(event)
-    host = os.environ.get("AW_DLP_SYSLOG_HOST", "127.0.0.1")
-    port = int(os.environ.get("AW_DLP_SYSLOG_PORT", "514"))
-    send_syslog(line, host, port)
-    logging.info("sent CEF event to %s:%d", host, port)
+    setup_logging()
+    cfg_path = Path("/opt/activitywatch/dlp-integrations/cef-config.yaml")
+    cfg = load_yaml(cfg_path)
+    aw_base = str(cfg.get("aw_api_base", "http://127.0.0.1:5600/api/0")).rstrip("/")
+    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")).lower()
+    per_bucket_limit = int(cfg.get("per_bucket_limit", 300))
+    state_path = Path(str(cfg.get("state_path", "/var/lib/activitywatch/dlp-integrations/cef-state.json")))
+    sev_mapping = cfg.get("severity_mapping", {"low": 3, "medium": 6, "high": 10})
+    if not isinstance(sev_mapping, dict):
+        sev_mapping = {"low": 3, "medium": 6, "high": 10}
+
+    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 ev in incidents:
+        line = build_cef(ev, sev_mapping)
+        if syslog_proto == "tcp":
+            send_syslog_tcp(line, syslog_host, syslog_port)
+        else:
+            send_syslog_udp(line, syslog_host, syslog_port)
+        sent += 1
+    state["last_ids"] = max_ids
+    state["updated_at"] = datetime.now(timezone.utc).isoformat()
+    save_json(state_path, state)
+    LOG.info("CEF exporter done: sent=%d buckets=%d target=%s:%d/%s", sent, len(max_ids), syslog_host, syslog_port, syslog_proto)


 if __name__ == "__main__":