signing-service: Dockerfile, K8s manifests (agent-trust), image CI, secret convention
- Dockerfile: multi-stage (golang:1.23-alpine3.21 → distroless/static:nonroot),
CGO off, trimpath, stripped, UID/GID 65532, read-only rootfs friendly.
- deploy/signing-service/: ServiceAccount, Deployment (2 replicas, probes,
tight SecurityContext), ClusterIP Service on :8081, NetworkPolicy
(ingress from agent-trust, DNS egress), example Secret, and README with
the full dev + prod secret convention.
- .forgejo/workflows/build-images.yml: builds image on push + PR,
pushes :<git-sha> + :main to harbor.basicstack.de on main pushes only.
Clone pattern matches validate.yml (sha256 repo, manual git clone).
- README updates: service README gains Deployment section; repo README
layout now mentions services/signing-service, services/transparency-log,
deploy/, and the new workflow.
Scope matches DEV-605. OpenBao, OPA and Pocket-ID JWKS stay stubs and move
in their own follow-up subtasks; the prod secret shape is documented so
those subtasks can plug in without reshaping the Deployment.
Co-Authored-By: Paperclip <noreply@paperclip.ing>
2026-10-25 18:18:28 +00:00
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: signing-service
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namespace: agent-trust
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labels:
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app.kubernetes.io/name: signing-service
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app.kubernetes.io/part-of: proofedmesh
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app.kubernetes.io/component: trust-core
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signing-service: Pocket-ID JWKS + K8s TokenReview + OPA (DEV-609)
Wires the signing-service's production path for ProofedMesh Phase 1:
the service now performs a double identity check (Pocket-ID OIDC JWT
+ K8s ServiceAccount TokenReview), reconciles both against the
trust-api `agents` registry, and asks an OPA/Rego policy whether the
caller may sign with the requested key_ref.
Code
- internal/token/pocket_id.go: OIDC-Discovery-backed JWKS validator
with automatic kid rotation (coreos/go-oidc).
- internal/token/k8s_tokenreview.go: hand-rolled TokenReview client;
reads X-Workload-Token, posts to authentication.k8s.io/v1 via the
pod's in-cluster SA token + CA.
- internal/registry: Postgres resolver for the agents table +
in-memory Static resolver for tests.
- internal/policy/opa.go: OPA/rego StructuredDecider; input carries
both lookups so the policy can enforce identity consistency AND
the key_ref ↔ role mapping.
- internal/httpapi/sign.go: new structured flow when
Validator+TokenReviewer+Registry+StructuredPolicy are all wired;
dev path (static bearers + AllowAll) remains intact.
- cmd/signing-service/main.go: -pocket-id-issuer,
-pocket-id-audience, -k8s-tokenreview, -registry-dsn,
-policy-bundle flags.
Policy
- policies/sinks/signing_service.rego: identities_agree +
key_ref_matches_role rules; agent → key_ref prefix map covers
approval-service, testagent-transform, dummy-sink.
Deploy
- deploy/signing-service/01-rbac.yaml: ClusterRole with
tokenreviews.create + binding to the signing-service SA.
- deploy/signing-service/20-deployment.yaml: adds POCKET_ID_ISSUER,
POCKET_ID_AUDIENCE, TRUST_PG_DSN env, projected SA token volume,
OPA policy ConfigMap mount, structured flags.
- deploy/signing-service/00-serviceaccount.yaml: disables default
auto-mount; a projected volume is used.
- deploy/signing-service/README.md: documents prod flags +
ConfigMap generation.
Tests
- httptest-mock Pocket-ID (OIDC discovery + JWKS, kid rotation),
StaticTokenReviewer fake, Static registry, real Rego policy.
- Happy paths: Approval-Service → trust-api/approval-signer-2026-q4;
testagent-transform → trust-api/agent-testagent-transform-2026-q4.
- Denies: registry mismatch, wrong key_ref for role, missing /
bad workload token, bad Pocket-ID token, kid rotation.
Co-Authored-By: Paperclip <noreply@paperclip.ing>
2026-10-25 19:42:40 +00:00
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# The signing-service pod uses an EXPLICIT projected SA token
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# (deploy/signing-service/20-deployment.yaml) rather than the default
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# auto-mount, so this SA opts out of auto-mounting.
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automountServiceAccountToken: false
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