fix(tbtc/signer): track interactive inactivity monotonically#4162
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mswilkison merged 2 commits intoJul 15, 2026
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mswilkison
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fix/signer-admission-policy-schema-2026-07-14
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extraction/frost-signer-mirror-2026-05-26
July 15, 2026 11:01
mswilkison
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Jul 15, 2026
## Stack 2 of 3. Parent: #4160. Next: #4162. ## Summary - Reject unknown top-level fields when deserializing `AdmissionPolicyV1`. - Keep supported policy files compatible while turning misspelled security controls into explicit input errors instead of omitted limits. - Add a malicious typo regression and a supported-field positive control. ## Review finding addressed - P2: unknown admission-policy fields could silently disable enforcement and fail open. ## Security invariant A policy field that the checker does not recognize cannot silently alter or weaken admission behavior. ## Validation - `cargo test --locked --manifest-path pkg/tbtc/signer/Cargo.toml` on this branch tip: 270 library tests passed, 1 ignored; 30 admission-checker tests passed; 1 integration test passed. - The real checker rejects a misspelled `max_operator_per_provider` field and accepts the shipped policy sample.
mswilkison
merged commit Jul 15, 2026
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extraction/frost-signer-mirror-2026-05-26
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Stack
3 of 3. Parent: #4161.
Summary
Instantstate instead of wall-clock Open time.Review finding addressed
Lifecycle invariant
Only accepted or retry-preserving member activity extends the TTL; successful terminal operations and post-replacement failures still retire the nonce handle.
Validation
cargo test --locked --manifest-path pkg/tbtc/signer/Cargo.toml: 273 library tests passed, 1 ignored; 30 admission-checker tests passed; 1 integration test passed.cargo check --locked --manifest-path pkg/tbtc/signer/Cargo.toml --all-targets.cargo clippy --locked --manifest-path pkg/tbtc/signer/Cargo.toml --all-targets -- -D warnings.cargo fmt --manifest-path pkg/tbtc/signer/Cargo.toml -- --checkandgit diff --check.pkg/tbtc/signer/scripts/run_phase5_chaos_suite.sh: all 6 fault-injection scenarios passed.