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Restrict agent-phase DNS egress to cluster DNS #471

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Restrict agent-phase DNS egress to cluster DNS #471

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13 changes: 10 additions & 3 deletions k8s/local/network-policies.yaml
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
---
# Agent phase: allow only DNS + outbound port 443.
# Agent phase: allow only cluster DNS + outbound port 443.
# All HTTPS traffic from the main container is transparently intercepted by the
# iptables REDIRECT rule and forwarded to the proxy SNI router on port 15443.
# The proxy sidecar (UID 1337, exempt from REDIRECT) reaches the internet directly.
Expand All @@ -16,8 +16,15 @@ spec:
policyTypes:
- Egress
egress:
# DNS resolution
- ports:
# DNS resolution — cluster DNS only (kube-dns / CoreDNS in kube-system).
# Without a `to:` selector port 53 is open to the entire internet, which
# would let agent code exfiltrate data or tunnel arbitrary traffic (e.g.
# LLM calls to non-whitelisted providers) over DNS queries.
- to:
- namespaceSelector:
matchLabels:
kubernetes.io/metadata.name: kube-system
ports:
- port: 53
protocol: UDP
- port: 53
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