jakman85andClaude Opus 4.8
b6e8adc6c6
The policy is wired into the kustomization, reconciled by Flux, and conformance-green; gluetun is retired. Update the header banner + bottom checklist to reflect that. Comment-only — the CiliumEgressGatewayPolicy spec is unchanged. Co-Authored-By: Claude Opus 4.8 <[email protected]>
81 lines
5.1 KiB
YAML
81 lines
5.1 KiB
YAML
---
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# ============================================================================
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# Cilium Egress Gateway steering for `egress-class=vpn` pods — ADR-0015.
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# Serves: R-NET-05, R-NET-06, R-NET-07.
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#
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# ##########################################################################
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# ## LIVE (2026-08-24): wired into kustomization.yaml, reconciled by Flux ##
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# ## and conformance-green (egress-class + vpn-killswitch pass on dev). ##
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# ##########################################################################
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#
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# This policy steers vpn-class pods out the gateway node's host `tun0` interface. It REQUIRES the
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# Ansible-managed host OpenVPN split-tunnel service on a node labeled
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# `homelab.keithjackson.dev/egress-gateway=true` — deploy that role BEFORE this policy reconciles, or
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# vpn-class pods are SNAT'd to a non-existent interface. The tunnel is live and validated end-to-end;
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# if tun0 is ever down, the host nftables kill-switch fails vpn-class CLOSED (see below). ADR-0015
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# chose this mechanism (node tunnel + Cilium Egress Gateway); this file IS that datapath.
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#
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# ---------------------------------------------------------------------------
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# PREREQUISITES CONFIRMED (2026-08-24):
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# * Cilium Egress Gateway is ENABLED per ADR-0002 — platform/cilium/helmrelease.yaml and
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# platform/cilium/values.yaml both set (all [parity] with the Ansible bootstrap render):
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# egressGateway.enabled: true
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# bpf.masquerade: true (Egress Gateway REQUIRES eBPF masquerade)
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# kubeProxyReplacement: true
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# No Cilium HelmRelease change is needed for this policy. (If any of the three were false this
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# would be an ESCALATION, not a silent HelmRelease edit — they are all true, so we proceed.)
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#
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# INTERFACE CONTRACT (shared verbatim with the parallel Ansible host-tunnel role — ADR-0015):
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# * Gateway node label ...... homelab.keithjackson.dev/egress-gateway=true (applied by Ansible)
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# * Host tunnel interface .... tun0 (split-tunnel OpenVPN)
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# * Client selection ......... homelab.keithjackson.dev/egress-class=vpn (Kyverno-enforced)
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# ---------------------------------------------------------------------------
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apiVersion: cilium.io/v2
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kind: CiliumEgressGatewayPolicy
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metadata:
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name: vpn-egress-steering
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annotations:
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homelab.keithjackson.dev/requirements: R-NET-05,R-NET-06,R-NET-07
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homelab.keithjackson.dev/adr: ADR-0015
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spec:
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# --- Client selection (INVARIANTS 1 & 2) --------------------------------
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# ONLY pods explicitly opted into the vpn class are matched. Default/internet-class pods and node
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# traffic are never selected, so they stay on the local/private-WAN path (invariant 1: default is
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# the local path). Because ONLY these flows are steered, tun0 never becomes a default route for the
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# node or for any other pod (invariant 2). The selector is intentionally cluster-wide (no namespace
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# scope) so the class label alone is the contract — every namespace's vpn-class pods route here.
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selectors:
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- podSelector:
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matchLabels:
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homelab.keithjackson.dev/egress-class: vpn
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# --- What gets tunneled (INVARIANT 1: only PUBLIC internet leaves via the VPN) ------------------
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# destinationCIDRs is the full internet; excludedCIDRs carves out everything that must stay LOCAL:
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# all RFC1918 private ranges (which also cover the Cilium cluster-pool pod CIDR 10.0.0.0/8, the k3s
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# service/pod ranges, and the LAN 192.168.x/10.73.x node network). So intra-cluster east-west,
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# pod->service, and LAN traffic are NOT SNAT'd out tun0 — only genuinely public destinations are.
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# Excluded flows fall through to Cilium's normal local datapath (invariant 1).
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destinationCIDRs:
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- "0.0.0.0/0"
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excludedCIDRs:
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- "10.0.0.0/8" # RFC1918 + Cilium cluster-pool pod CIDR (CLUSTER_POD_CIDR) + k3s service net
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- "172.16.0.0/12" # RFC1918
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- "192.168.0.0/16" # RFC1918 (home LAN / node network family)
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# --- Where it egresses --------------------------------------------------
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# The gateway node (Ansible-labeled) SNATs matched traffic out its host split-tunnel `tun0`. When
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# tun0 is absent/down, Cilium has no egress interface here; the host nftables kill-switch (Ansible,
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# ADR-0015) is the authoritative fail-closed backstop that DROPS this vpn-class traffic — scoped to
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# vpn-class only, so default/internet-class is unaffected (invariants 3 & 4: vpn fails CLOSED,
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# internet fails OPEN).
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egressGateway:
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nodeSelector:
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matchLabels:
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homelab.keithjackson.dev/egress-gateway: "true"
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interface: tun0
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# ---------------------------------------------------------------------------
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# DONE (2026-08-24): enabled + validated + Gluetun retired.
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# * Host tun0 split-tunnel is up on the egress-gateway node; host nftables kill-switch in place.
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# * This file is wired into platform/vpn-egress/kustomization.yaml and reconciled by Flux.
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# * `egress-class` (R-NET-05/07) and `vpn-killswitch` (R-NET-06) conformance tests PASS live.
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# * The Gluetun Deployment was retired per ADR-0015 ("Gluetun is dropped as the gateway").
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# ---------------------------------------------------------------------------
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