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Security architecture

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Production deployment requires explicit trust boundaries, secure defaults, and tested mitigations for replication, webhooks, and HTTP gateways.

Trust boundaries

Section titled “Trust boundaries”
[Client SDK / CLI] --TLS?--> [gRPC :2113]
[REST/WS Gateway]  --HTTP-->  [gRPC backend]
[HA peer nodes]    --???-->   [ReplicationService]
[Billing webhook]  --HTTPS--> [External receiver]
[Admin UI BFF]     --HTTP-->  [gRPC backend]

Threat summary (STRIDE, high level)

Section titled “Threat summary (STRIDE, high level)”
Component Spoofing Tampering Repudiation Info disclosure DoS Elevation
gRPC (auth off) High High Medium High Medium High
ReplicationService High High High Medium High High
Billing webhook Low Medium Medium Medium Low Medium (SSRF)
WS gateway Medium Medium Low High Medium Medium
Admin destructive ops Low High Medium Low Medium High

Controls

Section titled “Controls”

D1 — Replication authentication

Section titled “D1 — Replication authentication”
  • mTLS between cluster members or shared cluster token on internal listener.
  • Unauthenticated ReplicationService on public bind is not supported.

D2 — Production config profile

Section titled “D2 — Production config profile”
  • CHRONACTA_PROFILE=production enforces: auth on, TLS on, loopback or explicit bind audit, webhooks allowlist only.

D3 — Webhook outbound

Section titled “D3 — Webhook outbound”
  • HTTPS only; DNS resolve + block private ranges; mandatory HMAC secret when URL configured; no per-request URL override in production profile.

D4 — HTTP gateways

Section titled “D4 — HTTP gateways”
  • WS CheckOrigin allowlist; deprecate ?token= query; TLS termination documented (gateway or reverse proxy).

D5 — RBAC

Section titled “D5 — RBAC”
  • New permission lifecycle.execute for scavenge; default-deny unknown gRPC methods when auth enabled.

D6 — Audit

Section titled “D6 — Audit”
  • Structured audit events for: scavenge execute, restore, remote backup, billing export, admin login failure.

Not provided

Section titled “Not provided”
  • Field-level encryption at rest
  • FIPS compliance

References

Section titled “References”