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129 lines
3.3 KiB
Python
129 lines
3.3 KiB
Python
#!/usr/bin/env python3
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"""
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Kubernetes APIserver.
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Serves a fake K8s REST API on port 6443 (HTTPS-ish, plain HTTP) and 8080.
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Responds to recon endpoints (/version, /api, /apis, /api/v1/namespaces,
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/api/v1/pods) with plausible but fake data. Logs all requests as JSON.
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"""
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import json
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import os
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from flask import Flask, request
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from decnet_logging import syslog_line, write_syslog_file, forward_syslog
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NODE_NAME = os.environ.get("NODE_NAME", "k8s-master")
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SERVICE_NAME = "k8s"
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LOG_TARGET = os.environ.get("LOG_TARGET", "")
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app = Flask(__name__)
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_VERSION = {
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"major": "1",
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"minor": "27",
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"gitVersion": "v1.27.4",
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"gitCommit": "fa3d7990104d7c1f16943a67f11b154b71f6a132",
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"gitTreeState": "clean",
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"buildDate": "2023-07-19T12:14:46Z",
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"goVersion": "go1.20.6",
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"compiler": "gc",
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"platform": "linux/amd64",
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}
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_API_VERSIONS = {
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"kind": "APIVersions",
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"versions": ["v1"],
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"serverAddressByClientCIDRs": [{"clientCIDR": "0.0.0.0/0", "serverAddress": f"{NODE_NAME}:6443"}],
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}
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_NAMESPACES = {
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"kind": "NamespaceList",
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"apiVersion": "v1",
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"items": [
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{"metadata": {"name": "default"}},
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{"metadata": {"name": "kube-system"}},
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{"metadata": {"name": "production"}},
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],
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}
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_PODS = {
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"kind": "PodList",
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"apiVersion": "v1",
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"items": [
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{"metadata": {"name": "webapp-6d5f8b9-xk2p7", "namespace": "production"},
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"status": {"phase": "Running"}},
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],
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}
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_SECRETS = {
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"kind": "Status",
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"apiVersion": "v1",
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"status": "Failure",
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"message": "secrets is forbidden: User \"system:anonymous\" cannot list resource \"secrets\"",
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"reason": "Forbidden",
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"code": 403,
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}
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def _log(event_type: str, severity: int = 6, **kwargs) -> None:
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line = syslog_line(SERVICE_NAME, NODE_NAME, event_type, severity, **kwargs)
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print(line, flush=True)
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write_syslog_file(line)
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forward_syslog(line, LOG_TARGET)
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@app.before_request
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def log_request():
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_log(
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"request",
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method=request.method,
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path=request.path,
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remote_addr=request.remote_addr,
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auth=request.headers.get("Authorization", ""),
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body=request.get_data(as_text=True)[:512],
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)
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@app.route("/version")
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def version():
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return app.response_class(json.dumps(_VERSION), mimetype="application/json")
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@app.route("/api")
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def api():
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return app.response_class(json.dumps(_API_VERSIONS), mimetype="application/json")
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@app.route("/api/v1/namespaces")
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def namespaces():
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return app.response_class(json.dumps(_NAMESPACES), mimetype="application/json")
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@app.route("/api/v1/pods")
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@app.route("/api/v1/namespaces/<ns>/pods")
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def pods(ns="default"):
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return app.response_class(json.dumps(_PODS), mimetype="application/json")
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@app.route("/api/v1/secrets")
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@app.route("/api/v1/namespaces/<ns>/secrets")
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def secrets(ns="default"):
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return app.response_class(json.dumps(_SECRETS), status=403, mimetype="application/json")
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@app.route("/", defaults={"path": ""})
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@app.route("/<path:path>", methods=["GET", "POST", "PUT", "DELETE", "PATCH"])
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def catch_all(path):
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return app.response_class(
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json.dumps({"kind": "Status", "status": "Failure", "code": 404}),
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status=404,
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mimetype="application/json",
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)
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if __name__ == "__main__":
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_log("startup", msg=f"Kubernetes API server starting as {NODE_NAME}")
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app.run(host="0.0.0.0", port=6443, debug=False)
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