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>

integrations/chronicle/manifest.yaml

@@ -0,0 +1,76 @@
+id: chronicle
+name: Google Chronicle
+version: 1.0.0
+description: "Google Chronicle (Backstory API) — SIEM threat context: list IOCs seen in the enterprise, list alerts, list assets, and get IOC details for an artifact. Authenticates with a Google service account (RS256 JWT bearer flow). Runs on a remote engine. Requires the Python 'PyJWT' and 'cryptography' libraries on the engine host (pip install pyjwt cryptography)."
+changelog: "1.0.0 — Initial release: list IOCs, list alerts, list assets, get IOC details."
+category: siem
+
+# Per-instance configuration. The scripts build a signed RS256 assertion from the
+# service account's private_key/client_email and exchange it for an access token
+# (scope chronicle-backstory). base_url is the regional Chronicle API host.
+config_schema:
+  properties:
+    service_account_json:
+      type: string
+      description: "Full Chronicle service account key JSON (must contain client_email and private_key)"
+      x-soar-sensitive: true
+    base_url:
+      type: string
+      description: "Chronicle API base URL (region-specific)"
+      default: "https://backstory.googleapis.com"
+  required:
+    - service_account_json
+
+commands:
+  - id: list_iocs
+    name: chronicle-list-iocs
+    description: "List IOCs (indicators of compromise) observed in the enterprise since a start time."
+    risk: read
+    inputs_schema:
+      properties:
+        start_time: { type: string, description: "RFC3339 start time (e.g. 2024-01-01T00:00:00Z)" }
+        page_size: { type: number, description: "Max IOCs (default 100)" }
+      required: [start_time]
+    outputs_schema: { properties: {} }
+  - id: list_alerts
+    name: chronicle-list-alerts
+    description: "List alerts in a time window."
+    risk: read
+    inputs_schema:
+      properties:
+        start_time: { type: string, description: "RFC3339 start time" }
+        end_time: { type: string, description: "RFC3339 end time" }
+        page_size: { type: number, description: "Max alerts (default 100)" }
+      required: [start_time, end_time]
+    outputs_schema: { properties: {} }
+  - id: list_assets
+    name: chronicle-list-assets
+    description: "List assets that accessed an artifact (domain, IP, or hash) in a time window."
+    risk: read
+    inputs_schema:
+      properties:
+        artifact_type: { type: string, description: "domain_name, destination_ip_address, or hash_sha256" }
+        artifact_value: { type: string, description: "The artifact value" }
+        start_time: { type: string, description: "RFC3339 start time" }
+        end_time: { type: string, description: "RFC3339 end time" }
+      required: [artifact_type, artifact_value, start_time, end_time]
+    outputs_schema: { properties: {} }
+  - id: ioc_details
+    name: chronicle-ioc-details
+    description: "Get IOC details for an artifact (domain, IP, or hash)."
+    risk: read
+    inputs_schema:
+      properties:
+        artifact_type: { type: string, description: "domain_name, destination_ip_address, or hash_sha256" }
+        artifact_value: { type: string, description: "The artifact value" }
+      required: [artifact_type, artifact_value]
+    outputs_schema: { properties: {} }
+
+  - id: test_connection
+    name: chronicle-test-connection
+    description: "Verify the service-account token exchange (used by the Test button)."
+    risk: read
+    inputs_schema:
+      properties: {}
+      required: []
+    outputs_schema: { properties: {} }

integrations/chronicle/scripts/ioc_details.py

@@ -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)

integrations/chronicle/scripts/list_alerts.py

@@ -0,0 +1,83 @@
+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 main(cfg, inputs):
+    start_time = inputs.get("start_time")
+    if not start_time:
+        raise Exception("start_time is required")
+    end_time = inputs.get("end_time")
+    if not end_time:
+        raise Exception("end_time is required")
+    page_size = inputs.get("page_size")
+    params = {
+        "start_time": start_time,
+        "end_time": end_time,
+        "page_size": int(page_size or 100),
+    }
+    return api("GET", "/v1/alert/listalerts", cfg, params)
+
+
+_run(main)

integrations/chronicle/scripts/list_assets.py

@@ -0,0 +1,90 @@
+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)
+    start_time = inputs.get("start_time")
+    if not start_time:
+        raise Exception("start_time is required")
+    end_time = inputs.get("end_time")
+    if not end_time:
+        raise Exception("end_time is required")
+    params["start_time"] = start_time
+    params["end_time"] = end_time
+    return api("GET", "/v1/artifact/listassets", cfg, params)
+
+
+_run(main)

integrations/chronicle/scripts/list_iocs.py

@@ -0,0 +1,79 @@
+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 main(cfg, inputs):
+    start_time = inputs.get("start_time")
+    if not start_time:
+        raise Exception("start_time is required")
+    page_size = inputs.get("page_size")
+    params = {
+        "start_time": start_time,
+        "page_size": int(page_size or 100),
+    }
+    return api("GET", "/v1/ioc/listiocs", cfg, params)
+
+
+_run(main)

integrations/chronicle/scripts/test_connection.py

@@ -0,0 +1,72 @@
+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 main(cfg, inputs):
+    api("GET", "/v1/ioc/listiocs", cfg, {"page_size": 1})
+    return {"ok": True}
+
+
+_run(main)