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mathiasandClaude Opus 4.8 240c3ec081
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feat(auth): trust the k8s cluster OIDC issuer for ServiceAccount tokens (ADR-0011 D1)
Additive: gitea-mcp now validates JWTs from a LIST of issuers — the existing
Authentik issuer (DEX_ISSUER_URL) AND, when K8S_ISSUER_URL is set, the in-cluster
k8s OIDC issuer for audience-bound ServiceAccount tokens. Lets in-cluster pods
authenticate with kubelet-rotated projected SA tokens instead of a static bearer.

- config: K8S_ISSUER_URL + K8S_MCP_AUDIENCE.
- cmd/gitea-mcp/k8soidc.go: HTTP client that fetches the k8s OIDC discovery/JWKS
  with the cluster CA + this pod's SA bearer (k3s requires an authed fetch;
  anonymous is 401).
- main.go: build the issuer list; switch NewJWTValidator -> NewMultiJWTValidator.
  The k8s issuer is best-effort — if its client can't be built (not in a pod) or
  its discovery is unreachable at startup, it is DROPPED and we fall back so
  Authentik/static auth is never taken down. Smoke-tested: off-pod it logs the
  skip and starts static-only; static-bearer /mcp returns 400 (auth passed), not 401.
- bump mcp-chassis v0.3.0 -> v0.5.0 (multi-issuer + per-issuer HTTPClient).

Refs infra ADR-0011; enables retiring the in-cluster static bearer.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-07 00:16:39 +02:00

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