mirror of
https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git
synced 2026-06-12 22:24:56 +03:00
mukul975
120 lines
3.9 KiB
Python
120 lines
3.9 KiB
Python
#!/usr/bin/env python3
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"""
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Kubernetes Network Policy Auditor
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Checks for missing network policies, default-deny enforcement,
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and identifies namespaces without proper segmentation.
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"""
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import subprocess
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import json
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import sys
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from dataclasses import dataclass, field
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@dataclass
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class NetPolFinding:
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namespace: str
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severity: str
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issue: str
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remediation: str
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def run_kubectl_json(args: list):
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cmd = ["kubectl"] + args + ["-o", "json"]
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try:
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result = subprocess.run(cmd, capture_output=True, text=True, timeout=30)
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if result.returncode != 0:
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return None
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return json.loads(result.stdout)
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except (subprocess.TimeoutExpired, json.JSONDecodeError, FileNotFoundError):
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return None
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def audit_network_policies():
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findings = []
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system_ns = {"kube-system", "kube-public", "kube-node-lease"}
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namespaces = run_kubectl_json(["get", "namespaces"])
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if not namespaces:
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print("[!] Cannot list namespaces")
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return findings
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for ns in namespaces.get("items", []):
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ns_name = ns["metadata"]["name"]
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if ns_name in system_ns:
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continue
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netpols = run_kubectl_json(["get", "networkpolicies", "-n", ns_name])
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policies = netpols.get("items", []) if netpols else []
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if not policies:
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findings.append(NetPolFinding(
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namespace=ns_name, severity="HIGH",
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issue="No NetworkPolicies defined",
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remediation=f"Create default-deny ingress/egress policy in namespace '{ns_name}'"
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))
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continue
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# Check for default-deny
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has_default_deny_ingress = False
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has_default_deny_egress = False
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for pol in policies:
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spec = pol.get("spec", {})
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pod_selector = spec.get("podSelector", {})
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policy_types = spec.get("policyTypes", [])
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if not pod_selector.get("matchLabels") and not pod_selector.get("matchExpressions"):
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if "Ingress" in policy_types and not spec.get("ingress"):
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has_default_deny_ingress = True
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if "Egress" in policy_types and not spec.get("egress"):
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has_default_deny_egress = True
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if not has_default_deny_ingress:
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findings.append(NetPolFinding(
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namespace=ns_name, severity="HIGH",
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issue="Missing default-deny ingress policy",
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remediation="Create NetworkPolicy with empty podSelector and Ingress policyType with no ingress rules"
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))
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if not has_default_deny_egress:
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findings.append(NetPolFinding(
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namespace=ns_name, severity="MEDIUM",
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issue="Missing default-deny egress policy",
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remediation="Create NetworkPolicy with empty podSelector and Egress policyType with no egress rules"
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))
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return findings
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def main():
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print("[*] Kubernetes Network Policy Auditor\n")
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findings = audit_network_policies()
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print(f"\n{'='*60}")
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print(f"NETWORK POLICY AUDIT REPORT")
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print(f"{'='*60}")
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print(f"Total Findings: {len(findings)}")
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for sev in ["CRITICAL", "HIGH", "MEDIUM", "LOW"]:
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sev_findings = [f for f in findings if f.severity == sev]
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if sev_findings:
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print(f"\n{sev}:")
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for f in sev_findings:
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print(f" [{f.namespace}] {f.issue}")
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print(f" Fix: {f.remediation}")
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with open("netpol_audit_report.json", "w") as fh:
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json.dump({"findings": [{"namespace": f.namespace, "severity": f.severity,
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"issue": f.issue, "remediation": f.remediation}
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for f in findings]}, fh, indent=2)
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print("\n[*] Report saved to netpol_audit_report.json")
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if any(f.severity in ("CRITICAL", "HIGH") for f in findings):
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sys.exit(1)
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if __name__ == "__main__":
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main()
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