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This change rechecks the durable community ban in the shared Git HTTP authentication path for advertise, fetch, and push requests. A banned member is denied even if repository-channel membership still exists, and restriction lookup errors fail closed. The additional database lookup happens on every Git HTTP request so access revocation does not depend on stale session state. The check also cascades to the NIP-OA owner. Git accepts NIP-OA attestations on the NIP-98 token, so an agent key can act for its owner — without the cascade, a banned human would keep clone and push access through any agent key. This mirrors the NIP-42 gate in `handlers::auth`: either principal's ban denies the request. The check runs inside the `GitAuth` extractor, so all three Git routes inherit it. ## Testing - `git diff --check origin/main...codex/security-ban-revokes-git` - Rebased onto `origin/main` at `5c98932` - `cargo test -p buzz-relay --lib sec005_read_gate_tests`: 8 passed, 7 ignored (Postgres) - `cargo clippy -p buzz-relay --all-targets -- -D warnings` and `cargo fmt --check`: clean Pure tests cover the decision table (agent ban, inherited owner ban, no attestation). Postgres-gated tests cover the wiring: the real ban row, a live `compute_auth_tag` attestation, and the 503 fail-closed path. **Not yet verified:** the three Postgres-gated tests compile and skip but have not been run — no local Postgres, and CI does not run `--ignored`. They need `cargo test -p buzz-relay --lib sec005_read_gate_tests -- --ignored` against a migrated dev database. Originating Buzz thread: `buzz://message?channel=3928fe05-df61-4b5d-b9c7-d623b9b10ea1&id=3c6c02312f763fbe0d2bfc33a6c1a362f91d0354f3d18b039cf7a0558c1439d1` --------- Signed-off-by: Jordan Mecom <jm@squareup.com> Signed-off-by: Eli Foster <efoster@squareup.com> Co-authored-by: Eli Foster <efoster@squareup.com> Co-authored-by: Claude Opus 5 <noreply@anthropic.com>