Guillaume BOURGEOIS
aca1db5cad
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>
80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
import json, os, sys, time, urllib.parse, urllib.request, urllib.error
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import jwt
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TOKEN_URL = "https://oauth2.googleapis.com/token"
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SCOPE = "https://www.googleapis.com/auth/chronicle-backstory"
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def _cfg():
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return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
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def _inputs():
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return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
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def _base(cfg):
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return (str(cfg.get("base_url") or "https://backstory.googleapis.com")).rstrip("/")
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def _token(cfg):
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raw = cfg.get("service_account_json", "")
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sa = json.loads(raw) if isinstance(raw, str) else raw
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if not sa.get("client_email") or not sa.get("private_key"):
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raise Exception("service_account_json must contain client_email and private_key")
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now = int(time.time())
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aud = sa.get("token_uri") or TOKEN_URL
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payload = {"iss": sa["client_email"], "scope": SCOPE, "aud": aud, "iat": now, "exp": now + 3600}
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assertion = jwt.encode(payload, sa["private_key"], algorithm="RS256")
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data = urllib.parse.urlencode({
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"grant_type": "urn:ietf:params:oauth:grant-type:jwt-bearer",
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"assertion": assertion,
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}).encode("utf-8")
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req = urllib.request.Request(aud, data=data,
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headers={"Content-Type": "application/x-www-form-urlencoded"}, method="POST")
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with urllib.request.urlopen(req, timeout=60) as r:
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tok = json.loads(r.read())
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if not tok.get("access_token"):
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raise Exception("Token request failed: " + json.dumps(tok))
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return tok["access_token"]
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def api(method, path, cfg, params=None):
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url = _base(cfg) + path
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if params:
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clean = {k: v for k, v in params.items() if v not in (None, "")}
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if clean:
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url += "?" + urllib.parse.urlencode(clean)
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headers = {"Accept": "application/json", "Authorization": "Bearer " + _token(cfg)}
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req = urllib.request.Request(url, headers=headers, method=method)
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with urllib.request.urlopen(req, timeout=90) as r:
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raw = r.read()
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return json.loads(raw) if raw else {}
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def _run(fn):
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try:
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print(json.dumps(fn(_cfg(), _inputs())))
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except urllib.error.HTTPError as e:
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print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
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sys.exit(1)
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except Exception as e:
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print(json.dumps({"error": str(e)}))
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sys.exit(1)
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def main(cfg, inputs):
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start_time = inputs.get("start_time")
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if not start_time:
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raise Exception("start_time is required")
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page_size = inputs.get("page_size")
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params = {
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"start_time": start_time,
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"page_size": int(page_size or 100),
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}
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return api("GET", "/v1/ioc/listiocs", cfg, params)
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_run(main)
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