Compare certificate overlap availability against retained trust risk
A long overlap helps slow clients but extends acceptance of old credentials.
- Focused work estimate
- 5h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Security tradeoffs · Reliability
Estimated field mix
- Security50%
- Site reliability30%
- Networking20%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional internal report exporter uses mutual TLS. Certificates are renewed manually, and operators cannot distinguish peer identity failures from network outages.
Setup prerequisites
- Generate disposable test-only certificate authorities and leaf certificates for loopback services; use no production keys.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- BMTLS-101 · Define expected service names and certificate usage
- BMTLS-102 · Validate certificate chains without disabling hostname checks
- BMTLS-103 · Separate certificate expiry alerts from connection failure rates
- BMTLS-104 · Refresh connection pools after client-certificate rotation
- BMTLS-105 · Keep TLS errors from exposing peer secrets or request payloads
- BMTLS-106 · Rehearse leaf renewal under an unchanged trust anchor
- BMTLS-107 · Rotate trust anchors without accepting unrelated authorities
- BMTLS-108 · Enforce peer revocation on reused connections
Acceptance criteria
- Model client refresh distribution and enforcement delay.
- Compare bounded overlap options.
- Document unknown client behavior and recovery implications.
Implementation constraints
- The local rehearsal cannot prove organization-wide certificate rollout coverage.
Verification to include
- Evaluate fast and delayed synthetic clients.
- Reject an overlap proposal without an explicit old-trust retirement point.
Deliverables
- TLS lifecycle decision record.
Rollout and recovery
Choose a measurable overlap and track lagging clients before retirement.
Value of the work
For the engineer: Practice transport identity, trust-store changes, and certificate failure diagnosis.
For the team: Provide repeatable rotation and recovery behavior for authenticated service communication.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.