feat(chronicle): new Google Chronicle SIEM integration

Chronicle Backstory API, 5 commands: list IOCs, list alerts, list assets, get IOC details. Service-account RS256 JWT auth (remote engine, PyJWT + cryptography). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-12 00:25:51 +02:00
parent d0d72c5171
commit aca1db5cad
6 changed files with 482 additions and 0 deletions
@@ -0,0 +1,82 @@
+import json, os, sys, time, urllib.parse, urllib.request, urllib.error
+
+import jwt
+
+TOKEN_URL = "https://oauth2.googleapis.com/token"
+SCOPE = "https://www.googleapis.com/auth/chronicle-backstory"
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def _base(cfg):
+    return (str(cfg.get("base_url") or "https://backstory.googleapis.com")).rstrip("/")
+
+
+def _token(cfg):
+    raw = cfg.get("service_account_json", "")
+    sa = json.loads(raw) if isinstance(raw, str) else raw
+    if not sa.get("client_email") or not sa.get("private_key"):
+        raise Exception("service_account_json must contain client_email and private_key")
+    now = int(time.time())
+    aud = sa.get("token_uri") or TOKEN_URL
+    payload = {"iss": sa["client_email"], "scope": SCOPE, "aud": aud, "iat": now, "exp": now + 3600}
+    assertion = jwt.encode(payload, sa["private_key"], algorithm="RS256")
+    data = urllib.parse.urlencode({
+        "grant_type": "urn:ietf:params:oauth:grant-type:jwt-bearer",
+        "assertion": assertion,
+    }).encode("utf-8")
+    req = urllib.request.Request(aud, data=data,
+                                 headers={"Content-Type": "application/x-www-form-urlencoded"}, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        tok = json.loads(r.read())
+    if not tok.get("access_token"):
+        raise Exception("Token request failed: " + json.dumps(tok))
+    return tok["access_token"]
+
+
+def api(method, path, cfg, params=None):
+    url = _base(cfg) + path
+    if params:
+        clean = {k: v for k, v in params.items() if v not in (None, "")}
+        if clean:
+            url += "?" + urllib.parse.urlencode(clean)
+    headers = {"Accept": "application/json", "Authorization": "Bearer " + _token(cfg)}
+    req = urllib.request.Request(url, headers=headers, method=method)
+    with urllib.request.urlopen(req, timeout=90) as r:
+        raw = r.read()
+        return json.loads(raw) if raw else {}
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def _artifact_params(inputs):
+    at = inputs.get("artifact_type")
+    av = inputs.get("artifact_value")
+    if not at:
+        raise Exception("artifact_type is required")
+    if not av:
+        raise Exception("artifact_value is required")
+    return {"artifact." + at: av}
+
+
+def main(cfg, inputs):
+    params = _artifact_params(inputs)
+    return api("GET", "/v1/artifact/listiocdetails", cfg, params)
+
+
+_run(main)