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shankar0123
2e653acd7e
Production hardening II Phase 3 — wire the existing
internal/ratelimit/SlidingWindowLimiter into the OCSP and cert-export
handlers. Removes the DoS vector where an unauthenticated relying
party (or compromised admin token) can hammer the responder /
key-export endpoint at unbounded rates.
OCSP: per-source-IP cap. Default 1000 req/min/IP, 50k tracked IPs
(matches the SCEP/Intune replay cache cap). Configurable via
CERTCTL_OCSP_RATE_LIMIT_PER_IP_MIN; zero disables. Source IP comes
from net.SplitHostPort(r.RemoteAddr) — we deliberately do NOT honor
X-Forwarded-For because OCSP is publicly reachable and untrusted
intermediaries could spoof the header to bypass the limit.
On rate-limit trip: respond with the canonical
ocsp.UnauthorizedErrorResponse pre-built blob from x/crypto/ocsp
(status 6 per RFC 6960 §2.3) plus Retry-After: 60. Using the
unauthorized status (instead of TryLater) avoids hand-rolling DER
for a single rejection path; relying parties retry on any non-good
status anyway.
Cert-export: per-actor cap. Default 50 exports/hr/operator.
Configurable via CERTCTL_CERT_EXPORT_RATE_LIMIT_PER_ACTOR_HR; zero
disables. Actor extracted from the X-Actor request header (set by
the auth middleware); falls back to RemoteAddr if empty (defensive).
On rate-limit trip: HTTP 429 + JSON body
{"error":"rate_limit_exceeded","retry_after_seconds":3600} +
Retry-After: 3600.
NEW config fields in internal/config/config.go::SchedulerConfig:
OCSPRateLimitPerIPMin (default 1000)
CertExportRateLimitPerActorHr (default 50)
WIRED in cmd/server/main.go: ocspLimiter constructed with the
configured cap, 1m window, 50k map cap; exportLimiter same shape with
1h window. Both wired via SetOCSPRateLimiter / SetExportRateLimiter
on their respective handlers. Existing deploys see no behavior
change unless the env vars are set to non-default values + traffic
exceeds the cap.
Pre-commit verification: go build ./... clean; go test -short
-count=1 green for handler + service + config.