v0.7.1
7
Commits
| Author | SHA1 | Message | Date | |
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  mathiasandClaude Opus 5
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c0b8b26d03 |
feat(auth): export Fingerprint for servers with their own accepted path
CI / Lint / Test / Vet (push) Successful in 5s
gitea-mcp's PAT pass-through authenticates ahead of BearerMiddleware and emits its own `mcp auth accepted` line (gitea-mcp#60). It needs the same fingerprint, not an equivalent one: two different fingerprints for the same token across two log lines cannot be correlated, which is the entire purpose of the field. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> |
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mathiasandClaude Opus 5
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29e461e108 |
feat(auth): name the path that granted access, and stop blaming the caller
CI / Lint / Test / Vet (push) Successful in 5s
Closes #1. Closes gitea-mcp#58. Closes gitea-mcp#60. Three small changes to one decision point, kept together because they are the same surface and the same incident. 1. A JWT IS NEVER A STATIC-TOKEN MISMATCH (gitea-mcp#58) The fall-through reason was chosen by which comparison ran last, not by what the caller presented. So a JWT against a server with no JWT auth configured logged: reason=static_token_mismatch token_type=jwt status=401 The two fields contradict each other, and the sentence reads as "you presented the wrong token" when the truth is "this server could not have accepted any token of that kind". The misdirection reached the user — claude.ai surfaces "Authorization with gitea failed. You can check your credentials and permissions." — and a debugging session went into re-running the OAuth flow while the credentials were valid throughout. Now `jwt_auth_not_configured` for a JWT; `static_token_mismatch` stays, and is asserted to stay, for an actual static-token mismatch. Fixing the misleading case must not delete the accurate one. Note this is now the ONLY way to reach that branch with a JWT: since v0.6.0 a validator that merely could not reach its issuer is non-nil and answers ErrUnavailable -> 503. A nil validator means the server was never given an issuer. 2. SUCCESS IS LOGGED, WITH THE PATH THAT GRANTED IT (gitea-mcp#60) The middleware logged only on rejection. After re-authing a connector there was no way to tell whether a request used the static token or a JWT, only inference from which failures were absent. A log that proves a request failed, and nothing about how the successful ones succeeded, cannot answer the question anyone actually has during an auth incident. INFO mcp auth accepted auth_path=jwt caller=alice token_fp=... remote=... INFO mcp auth accepted auth_path=static token_fp=... remote=... Same disclosure rules as deny: a fingerprint, never the credential. The JWT subject is included because distinguishing WHO is the point of that path; `caller` is omitted rather than empty for the static path, which has no identity to report. 3. JWKS REFRESH INTERVAL IS CONFIGURABLE (#1) It was hardcoded at 1h, so an issuer rotating its signing key could leave every consumer rejecting valid JWTs for up to an hour. WithRefreshInterval, defaulting to 1h so nothing changes for existing callers. Variadic, per #1's own preferred option — a new positional parameter would force a coordinated bump across every consumer. Deliberately NOT read from the environment inside the library: a shared lib calling os.Getenv is a hidden dependency that surprises its consumers. Config ownership stays at the edge. The effective value is logged when an issuer resolves, which is #1's second acceptance criterion and the thing an operator needs during a key-rotation incident. The test asserts the configured value reaches the registration site via that line — a silently-ignored option being the failure mode worth pinning. Whether jwx then honours it is jwx's to test. One of my own assertions was wrong and the test caught it: tokenType() says "opaque", not "static", for a non-JWT credential. Corrected to the existing vocabulary rather than changing the vocabulary to match a new test. Verified: golangci-lint 0 issues; go vet clean; go test -race -count=1 ok. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> |
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mathiasandClaude Opus 5
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3257364f23 |
fix(auth): a validator whose issuer is down at boot is built anyway
CI / Lint / Test / Vet (push) Successful in 5s
Closes #4. Closes gitea-mcp#57. Filed 2026-07-17, filed again 2026-09-07, recurred 2026-09-14. Each occurrence ended with a human running `kubectl rollout restart`; the last one ran for six days and was found by chance while gathering context for unrelated work. THE BUG NewMultiJWTValidator resolved OIDC discovery eagerly and returned (nil, err) if the issuer was not answering. BearerMiddleware reads a nil validator as "this server does not do JWT auth", so it fell through to the static-token comparison and rejected every Authentik JWT: WARN mcp auth rejected reason=static_token_mismatch token_type=jwt status=401 Two states collapsed into one nil: static-token-only by design -> nil correct JWT required, IdP down at boot -> nil wrong, and permanent Permanent because discovery was attempted exactly once, at construction. WHY THE FIX IS SMALL Everything downstream was already right. Validate distinguishes ErrUnavailable (issuer unreachable -> 503, client retries) from a definitive rejection (-> 401), and BearerMiddleware already honours that — gitea-mcp#6 got it right. That path was simply unreachable when the validator was never built. So: build it anyway. jwks_uri now resolves lazily on first use and re-resolves on failure, no sooner than WithRetryInterval apart (default 30s) so a down issuer costs one discovery request per interval, not one per request. Until it resolves, Validate returns ErrUnavailable and the existing machinery does the rest. The constructor still warms discovery eagerly on a healthy start; it just no longer fails on it. Ready(ctx) reports whether every issuer resolved, and attempts resolution for any that have not. That makes a readiness probe the retry loop — no background goroutine, no context to leak, and the platform's own cadence drives recovery. A nil validator is Ready: "JWT auth disabled" is a configuration, not a fault. WHAT DID NOT CHANGE No issuer configured still returns (nil, nil). That is the one case where nil is not a lie, and collapsing it would turn every static-only server into a JWT server. Pinned by TestNewMultiJWTValidator_NoIssuer_StillReturnsNilNil. ONE EXISTING TEST CHANGED ITS MECHANISM, NOT ITS CLAIM TestNewMultiJWTValidator_UsesPerIssuerHTTPClientForAuthedFetch asserted that the constructor ERRORS when discovery 401s without the fetch credential. It cannot, now, by design. Rewritten to assert the property that actually mattered, and more directly than before: without the credential the validator is not Ready AND a correctly-minted token from that very issuer is refused as ErrUnavailable. The old test only checked that a constructor returned an error. Written test-first: jwt_bootrace_test.go red (API absent), then green. Also red in the behavioural sense — the constructor-errors assertion above had to be rewritten precisely because the semantics genuinely changed. Verified: golangci-lint 0 issues; go vet clean; go test -race -count=1 ./... ok. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> |
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mathiasandClaude Opus 4.8
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4e16913248 |
feat(auth): per-issuer HTTPClient for authenticated JWKS fetch (infra ADR-0011)
The k3s OIDC discovery + JWKS endpoints require an AUTHENTICATED request (anonymous -> 401; anonymous-auth is off on the cluster) and are served over the cluster CA. A bare http.DefaultClient (correct for public Authentik) cannot reach them, so multi-issuer alone (v0.4.0) could not actually validate k8s SA tokens in-cluster. Add IssuerConfig.HTTPClient: when set, it fetches THAT issuer's discovery + JWKS (threaded into discoverJWKSURI and jwk.Cache.Register via jwk.WithHTTPClient). The k8s-issuer consumer supplies a client that trusts the cluster CA (/var/run/secrets/kubernetes.io/serviceaccount/ca.crt) and carries the server pod's SA bearer. nil keeps http.DefaultClient (Authentik/public, unchanged). Test: an auth-gated in-process issuer — unauthenticated fetch fails, a client carrying the credential builds + validates a token. Empirically grounded in the k3s 401 finding during the ADR-0011 in-cluster PoC. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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mathiasandClaude Opus 4.8
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75eb8b831c |
feat(auth): multi-issuer JWT validation — accept k8s SA tokens (infra ADR-0011)
JWTValidator trusted a single issuer (iss matched exactly against DEX_ISSUER_URL),
which is why every in-cluster caller fell back to a static bearer. Add support
for a LIST of trusted issuers so one MCP server can accept Authentik JWTs
(interactive/web) AND k3s cluster ServiceAccount tokens (in-cluster, audience-
bound, kubelet-rotated) at once — the enabler for ADR-0011.
- Add IssuerConfig{IssuerURL, Audience} + NewMultiJWTValidator([]IssuerConfig).
- Refactor JWTValidator to hold []issuerEntry + a shared jwk.Cache; Validate
tries each trusted issuer, returns the subject on first success. All-issuers-
JWKS-unreachable -> ErrUnavailable (503); any definitive reject -> 401.
- NewJWTValidator (single issuer) and BearerMiddleware signatures UNCHANGED —
existing consumers (gitea-mcp, ingestion) compile and behave identically.
- Add auth/jwt_test.go: an in-process OIDC issuer harness (discovery + JWKS +
token minting) — the chassis previously had NO happy-path JWT test. Covers
accept-either-trusted-issuer, reject-untrusted (401 not 503), per-issuer
audience enforcement, single-issuer backward compat.
Proven viable by the ADR-0011 live-cluster spike (k3s OIDC/JWKS validates a
projected SA token). Follow-up: wire gitea-mcp/brain-mcp/ingestion to also trust
the k3s issuer + mount an audience-scoped projected SA token on one pod.
Refs infra ADR-0011; supersedes the sidecar in infra#183. (Tracked as
hyperguild#77, which was misfiled — the chassis is this repo, not hyperguild.)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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mathiasandClaude Opus 4.8
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d5aa5b992c |
feat(auth): audit-log rejections + 503 on Dex outage (gitea-mcp#9, #6)
BearerMiddleware now emits a structured slog line on every rejection with the reason (no_token / static_token_mismatch / jwt_invalid / jwt_dex_unavailable), client IP (X-Forwarded-For aware), presented token type (jwt/opaque), and a truncated SHA-256 fingerprint — never the raw token, so no secret material reaches stdout/log aggregation. Validate now tags a JWKS/Dex fetch failure with the exported ErrUnavailable sentinel (distinct from a present-but-invalid token). BearerMiddleware maps it to HTTP 503 with `WWW-Authenticate: Bearer error="temporarily_unavailable"`, so a transient Dex outage is distinguishable from a bad token instead of a silent generic 401. No signature change — logging goes through slog.Default(); existing consumers are unaffected until they set a default logger. Behavior reaches a consumer only when it bumps the chassis version. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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mathiasandClaude Opus 4.7
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67decddc8a |
feat: initial mcp-chassis with auth primitives
Shared Go library for Mathias-owned MCP servers, born from spike S3 of the 2026-05 homelab architecture review (see gitea.d-ma.be/mathias/infra/docs/superpowers/handoffs/2026-05-22-mcp-chassis-spike.md for the viability assessment and abort-criterion check). Provides three primitives every MCP server today re-implements: - auth.JWTValidator — Dex OIDC JWT validation. nil-safe (nil = "JWT disabled"), audience-optional. Lifted from the identical ~80-LOC implementations in gitea-mcp and hyperguild/ingestion. - auth.BearerMiddleware — dual-mode static-Bearer-or-Dex-JWT gate. Static wins first to avoid emitting a WWW-Authenticate challenge that would flip claude.ai's MCP client into OAuth discovery for static-only deployments. The fall-through 401 emits the RFC 9728 resource_metadata header only when explicitly configured. - auth.ProtectedResourceHandler — RFC 9728 /.well-known/oauth-protected-resource metadata document handler. Test coverage exercises every branch (static OK, JWT-disabled, empty bearer, wrong static, with-challenge vs without-challenge, nil-validator-Validate). go test -race clean. Deps: github.com/lestrrat-go/jwx/v2 (already a dep of every consumer) and testify (test-only). No new transitive deps. First migration target: gitea-mcp. If that port lands in one PR (abort criterion from spec), brain-mcp (ingestion) follows. Otherwise chassis reverts per the spec. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |