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| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
 shankar0123
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2a1a0b347c |
harden(oidc): pre-login UA/IP binding (MED-16) — RFC 9700 §4.7.1
Audit 2026-05-10 MED-16 closure.
WHAT.
Binds the OIDC pre-login row to the (clientIP, userAgent) tuple of
the /auth/oidc/login request, and enforces a constant-time compare
against the /auth/oidc/callback request at consume time. Defeats
replay of a stolen pre-login cookie by a different browser /
source — the secondary defense layer recommended by RFC 9700 §4.7.1
when the primary layer (HMAC integrity + Path=/ + SameSite=Lax on
the cookie) is bypassed via CSRF / XSS / TLS-termination leak.
WHY.
Pre-fix, the pre-login cookie's HMAC verified only that 'some'
caller of /auth/oidc/login was talking to /auth/oidc/callback; it
did not verify that the SAME browser / source was on both sides.
An attacker who exfiltrated the cookie value via any vector could
replay the bytes through their own user-agent and ride the victim's
authorization. RFC 9700 §4.7.1 calls out the gap explicitly and
recommends binding state to a user-agent fingerprint + source IP.
HOW.
Migration:
migrations/000044_prelogin_uaip.up.sql
ALTER TABLE oidc_pre_login_sessions
ADD COLUMN IF NOT EXISTS client_ip TEXT,
ADD COLUMN IF NOT EXISTS user_agent TEXT;
Both nullable for in-flight rolling-deploy compat — the consume-
side check only enforces when both row AND request carry non-empty
values for the leg in question.
Domain:
internal/repository/oidc.go (PreLoginSession) — adds ClientIP +
UserAgent fields.
Repository:
internal/repository/postgres/oidc_prelogin.go — Create persists
via sql.NullString (empty → NULL); LookupAndConsume reads back.
Re-uses package-local nullableString from discovery.go.
Service:
internal/auth/oidc/service.go
- PreLoginStore.CreatePreLogin signature takes (clientIP,
userAgent) as positions 5–6.
- PreLoginStore.LookupAndConsume returns (clientIP, userAgent)
as positions 5–6.
- HandleAuthRequest signature gains (clientIP, userAgent),
threaded to the store.
- HandleCallback adds Step 1.5 — UA / IP constant-time compare
between stored row and incoming request. Per-leg toggles via
preLoginRequireUA / preLoginRequireIP service fields. Empty
values on either side pass through (rolling-deploy + headless-
proxy compat).
- New sentinels ErrPreLoginUAMismatch, ErrPreLoginIPMismatch.
- SetPreLoginBindingRequirements(requireUA, requireIP) helper
for main.go config wiring.
Adapter:
internal/auth/oidc/prelogin.go — PreLoginAdapter passes the new
fields through to the repo row.
Handler:
internal/api/handler/auth_session_oidc.go
- OIDCAuthHandshaker.HandleAuthRequest signature updated.
- LoginInitiate captures clientIPFromRequest + r.UserAgent()
and passes to the service.
- classifyOIDCFailure adds errors.Is dispatch for the two new
sentinels → prelogin_ua_mismatch / prelogin_ip_mismatch
audit categories.
Config:
internal/config/config.go
+ AuthConfig.OIDCPreLoginRequireUA (default true)
env CERTCTL_OIDC_PRELOGIN_REQUIRE_UA
+ AuthConfig.OIDCPreLoginRequireIP (default true)
env CERTCTL_OIDC_PRELOGIN_REQUIRE_IP
cmd/server/main.go calls oidcService.SetPreLoginBindingRequirements
from cfg.Auth.OIDCPreLoginRequire{UA,IP}.
Tests (internal/auth/oidc/service_test.go):
- TestService_HandleCallback_MED16_UAMismatchRejected
- TestService_HandleCallback_MED16_IPMismatchRejected
- TestService_HandleCallback_MED16_BothMatch_Succeeds
- TestService_HandleCallback_MED16_LegacyRowEmptyValues (rolling-
deploy compat — empty stored values pass through)
- TestService_HandleCallback_MED16_RequireUAFalse_AllowsMismatch
(operator escape-hatch — UA mismatch silently allowed)
Mechanical fan-out:
- stubPreLogin / stubPreLoginRepo signatures updated.
- All existing call sites in service_test.go (~40), prelogin_test.go,
bench_test.go, logging_test.go, provider_enabled_test.go,
integration_keycloak_test.go, integration_okta_smoke_test.go,
auth_session_oidc_test.go updated to pass empty strings for the
new params — pre-existing tests do not exercise UA/IP binding
semantics.
VERIFY.
- go vet ./internal/auth/oidc/... ./internal/api/handler/...
./internal/config/... PASS
- go test -short -count=1 -run MED16 ./internal/auth/oidc/... PASS (5/5)
- go test -short -count=1 ./internal/auth/oidc/... PASS (4.6s)
- go test -short -count=1 ./internal/api/handler/... PASS (4.3s)
- go test -short -count=1 ./internal/config/... PASS
Refs: cowork/auth-bundles-audit-2026-05-10.md MED-16
cowork/auth-bundles-fixes-2026-05-10/HANDOFF.md item 6
RFC 9700 §4.7.1 — OAuth 2.0 Security Best Current Practice
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shankar0123
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2cd2a5c52f |
harden(oidc): RFC 9207 iss URL parameter check on callback (MED-17)
Audit 2026-05-10 MED-17 closure.
WHAT.
When the matched IdP's discovery doc advertises
authorization_response_iss_parameter_supported=true (RFC 9207 §3),
HandleCallback now REQUIRES a non-empty `iss` query parameter on
/auth/oidc/callback and enforces a constant-time compare against the
configured provider's IssuerURL. Mismatch maps to two new sentinel
errors (ErrIssParamMissing / ErrIssParamMismatch) that the handler's
classifyOIDCFailure dispatches via errors.Is BEFORE the substring
fall-through, so the audit failure_category remains distinguishable
between the RFC 9207 leg (iss_param_missing / iss_param_mismatch) and
the in-token iss claim leg (id_token_iss_mismatch).
WHY.
The RFC 9207 iss URL parameter is the load-bearing mix-up-attack
defense for multi-tenant IdPs (Keycloak realms, Authentik tenants,
Auth0 tenants, public-trust CAs). Pre-fix the parameter was silently
ignored — an attacker controlling one IdP tenant could route an auth
code to certctl's callback against a different tenant's pre-login
state without detection. Modern Keycloak / Authentik / public-trust
CAs ship the discovery flag by default; legacy IdPs that don't
advertise are unaffected (back-compat preserved).
HOW.
- internal/auth/oidc/service.go
- providerEntry gains issParamSupported bool.
- getOrLoad extends the discovery-claims read to include
authorization_response_iss_parameter_supported, alongside the
existing id_token_signing_alg_values_supported defense.
- HandleCallback's signature gains callbackIss string at position 5.
Step 2.5 runs after the state compare + provider load: when
issParamSupported is true, an empty callbackIss returns
ErrIssParamMissing; a present-but-mismatched value returns
ErrIssParamMismatch (constant-time compare).
- Two new sentinels: ErrIssParamMissing, ErrIssParamMismatch.
ErrIssuerMismatch's doc-string clarified to note it covers the
in-token leg only.
- internal/api/handler/auth_session_oidc.go
- OIDCAuthHandshaker.HandleCallback signature updated.
- LoginCallback reads r.URL.Query().Get("iss") (no TrimSpace —
byte-strict compare upstream) and threads it through.
- classifyOIDCFailure: typed errors.Is dispatch for the three
iss-family sentinels BEFORE the substring fall-through, so the
three cases stay distinguishable in the audit row.
- internal/api/handler/auth_session_oidc_test.go
- stubOIDCSvc.HandleCallback bumped to 7-arg signature.
- TestClassifyOIDCFailure extended with 5 new cases pinning the
iss-family dispatch + a wrapped-error round-trip.
- internal/auth/oidc/service_test.go
- mockIdP gains advertiseIssParameterSupported bool; the
/.well-known/openid-configuration handler emits the claim only
when set (so existing tests stay back-compat).
- 4 new regression tests:
* MED17_NoSupport_AnyIssAccepted — provider doesn't advertise;
arbitrary callbackIss is ignored (back-compat).
* MED17_SupportButMissing — provider advertises; missing iss →
ErrIssParamMissing.
* MED17_SupportButMismatch — provider advertises; wrong iss →
ErrIssParamMismatch (load-bearing mix-up defense).
* MED17_SupportAndCorrect — provider advertises; matching iss →
success path proves the gate isn't over-eager.
- internal/auth/oidc/bench_test.go,
internal/auth/oidc/logging_test.go,
internal/auth/oidc/integration_keycloak_test.go
- Mechanical: all existing HandleCallback call sites updated to
pass "" for callbackIss (matches pre-fix behavior for IdPs that
don't advertise support — the Keycloak integration suite tests
will be re-evaluated once the Keycloak fixture is run against a
realm with the discovery flag enabled).
VERIFY.
- go vet ./internal/auth/oidc/... ./internal/api/handler/... PASS
- go test -short -count=1 ./internal/auth/oidc/... PASS (3.4s)
- go test -short -count=1 ./internal/api/handler/... PASS (5.4s)
- 4 new MED-17 regression tests + extended TestClassifyOIDCFailure pass.
Refs: cowork/auth-bundles-audit-2026-05-10.md MED-17
cowork/auth-bundles-fixes-2026-05-10/HANDOFF.md item 7
RFC 9207 — OAuth 2.0 Authorization Server Issuer Identification
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shankar0123
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9b6294e83d |
auth-bundle-2 Phase 14: session + OIDC validation benchmarks (steady-state + cold paths) + auth-benchmarks.md operator doc + Makefile targets
Closes Phase 14 of cowork/auth-bundle-2-prompt.md. Ships four
benchmarks producing four numbers + the operator-doc table; three
default-tag benchmarks runnable on every CI runner, the fourth
(cold-cache OIDC) runnable on operator-side Docker hosts via the
new make target.
Files
=====
internal/auth/session/bench_test.go (NEW):
* BenchmarkSession_SteadyState (target p99 < 1ms; measured 5µs).
Warm in-memory repo + warm session row. Pure CPU: parseCookie +
HMAC verify + map lookup + sentinel checks.
* BenchmarkSession_ColdProcess (target p99 < 10ms; measured 7.1ms).
Same pipeline but with a configurable per-call delay simulating
a 1ms Postgres RTT on each repo call. Two repo calls per
Validate (signing-key fetch + session-row fetch) = 2ms minimum;
Go time.Sleep granularity adds ~1-2ms jitter. Documented why
testcontainers Postgres isn't viable inside b.N: 30+ second
container boot incompatible with per-iteration timing.
* slowSessionRepo + slowKeyRepo wrappers add the per-call delay
via time.Sleep; they delegate to the existing in-memory stubs.
* reportPercentiles helper sorts + reports p50/p95/p99/max via
b.ReportMetric (Go testing.B doesn't surface percentiles
natively).
internal/auth/oidc/bench_test.go (NEW):
* BenchmarkOIDC_SteadyState (target p99 < 5ms; measured 1.5ms).
Drives full HandleCallback against an in-process mockIdP
(httptest.Server localhost loopback). Pre-warmed JWKS cache via
RefreshKeys at setup. Pipeline: pre-login consume + state
compare + token exchange (localhost ~50-200µs) + go-oidc
Verify (RSA-2048 sig verify + alg pin) + service-layer iss/
aud/azp/at_hash/exp/iat/nonce re-checks + group-claim
resolution + group→role mapping + user upsert + session mint.
* The localhost-loopback /token call adds ~100-500µs of TCP
overhead vs pure crypto; the prompt's "no network calls"
steady-state framing accommodates this since the localhost
loopback is the closest practical proxy for a same-region
IdP /token call (which adds 5-15ms in production).
internal/auth/oidc/bench_keycloak_test.go (NEW, //go:build integration):
* BenchmarkOIDC_ColdCache (target p99 < 200ms; operator-runs).
Drives RefreshKeys against a live Keycloak container from the
Phase 10 testfixtures harness. Each iteration evicts the
in-process cache + re-fetches discovery + re-fetches JWKS over
real HTTP + re-runs the IdP-downgrade-attack defense.
* Network-bounded: the cold path is dominated by HTTPS RTT to
the IdP discovery endpoint, NOT crypto. The 200ms cap
accommodates a geographically-distant IdP (~150ms RTT) plus
the in-process JWKS fetch + downgrade-defense logic (~5ms
locally).
* Reuses the sharedKeycloak fixture from
integration_keycloak_test.go (Phase 10) so the benchmark
doesn't pay the 60-90s container boot cost separately. Skips
with a clear message if invoked without the integration test
setup.
* Reports p50/p95/p99/max in MILLISECONDS (vs the
microsecond-granularity steady-state benchmarks) since the
cold path is two orders of magnitude slower.
internal/auth/oidc/service_test.go (MODIFIED):
* Refactored newMockIdP(t *testing.T) to delegate to a new
newMockIdPWithTB(t testing.TB) sibling. Standard Go pattern
for sharing test fixtures between *testing.T and *testing.B.
No behavior change for existing service_test.go tests; the
benchmark file in bench_test.go calls newMockIdPWithTB(b)
to get the same fixture.
docs/operator/auth-benchmarks.md (NEW):
* Result table with all four benchmarks + targets + measured
numbers + status markers. Four-row matrix for the default-tag
benchmarks; the fourth row (cold-cache) is operator-recorded
with an empty cell waiting for the first Docker-equipped run.
* Hardware floor section pinning the 4 vCPU / 8 GiB RAM /
Postgres 16 / Go 1.25 baseline. GitHub-hosted Ubuntu runners
satisfy this; operators on weaker hardware re-record.
* "What each benchmark covers (and what it doesn't)" section
per benchmark, distinguishing the warm steady-state pipeline
from the cold path's network-bounded budget.
* "Cold-cache OIDC: how to run" subsection documenting the
make target + the test+benchmark coupling needed to populate
sharedKeycloak. Operator-recorded baseline table seeded
empty for first runs.
* "Why the cold path is bounded by network latency, not crypto"
section explaining the budget breakdown:
- TCP handshake (1 RTT)
- TLS 1.3 handshake (1-2 RTTs)
- 2 HTTPS GETs (discovery + JWKS, 1 RTT each)
- In-process crypto on the certctl side (~5-10ms total)
So the 200ms cap is operator-checkable: real measurement >
200ms means the IdP is slow OR network congestion OR DNS
issues — the diagnosis is upstream of certctl. Real
measurement < 200ms means the IdP is on a fast same-region
link.
* Methodology section pinning the per-iteration timing capture
+ sort + percentile-extract approach.
* Pre-merge audit section for the Phase 14 exit gate: four
benchmarks ran, four numbers recorded, steady-state targets
met, cold path is operator-runnable + measurably-bounded.
Makefile (MODIFIED):
* Added `make benchmark-auth` (default-tag, runs three of four
benchmarks at 2000 samples each).
* Added `make benchmark-auth-coldcache` (integration-tagged,
runs OIDC cold-cache against live Keycloak; requires Docker).
* Both targets carry explanatory comment blocks.
docs/README.md (MODIFIED):
* Added the auth-benchmarks.md doc to the Operator nav table
alongside performance-baselines.md.
Measured baselines at Phase 14 close (linux/arm64, 4 vCPU)
==========================================================
BenchmarkSession_SteadyState p99 = 5µs (target < 1ms) ✓ 200× under
BenchmarkSession_ColdProcess p99 = 7.1ms (target < 10ms) ✓
BenchmarkOIDC_SteadyState p99 = 1.5ms (target < 5ms) ✓ 3× under
BenchmarkOIDC_ColdCache operator-runs (Docker required)
Verification
============
* gofmt -l on three new bench files: clean.
* go vet ./internal/auth/session/... ./internal/auth/oidc/...: clean
(default tag).
* go vet -tags integration ./internal/auth/oidc/...: clean (integration
tag covers the bench_keycloak_test.go file).
* go test -short -count=1 across all 5 OIDC + session packages:
green; the bench_*_test.go files compile but don't run under
-short (testing.Short() guards + benchmarks are not selected
by -run pattern).
* All three runnable benchmarks executed and produce the numbers
above; recorded in auth-benchmarks.md.
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