v0,28,2

docs/TRANSPORT.md

@@ -132,7 +132,7 @@ required when its selected certificate changed.
 
 For an externally managed/manual certificate whose configured files were replaced in place, `POST /api/certificates/{certificate_id}/reload` provides the same revision-stable hot-publication contract while targeting that certificate ID. For absolute external paths RustProxy canonicalizes the path again on every reload, intentionally following Certbot `live/` symlinks to the current `archive/` generation before opening the final regular file. The TLS resolver is immutable, so RustProxy validates and republishes a complete snapshot atomically; this avoids partially updated SNI state. Managed ACME certificate IDs are not accepted by this manual reload path.
 
-External absolute-path files are not copied into RustProxy full backups. Their path strings remain in configuration; restore or mount the certificate material separately on the destination host before starting TLS. The `rustproxy` service identity must be able to traverse every parent directory and read both files. External private keys may be owner-only (`0600`) or read-only for a restricted service group (`0640`); group-write, execute and any world permission are rejected.
+External absolute-path files are not copied into RustProxy full backups. Their path strings remain in configuration; restore or mount the certificate material separately on the destination host before starting TLS. The `rustproxy` service identity must be able to traverse every parent directory and read both files. RustProxy accepts POSIX ACL read access and does not require an exact chmod value. External certificate/key files must not be group/world-writable, and private keys must not be world-readable. The configured and resolved parent chains must be root- or RustProxy-owned and not group/world-writable, except for root-owned sticky ancestors such as `/tmp`. The final file is opened with `O_NOFOLLOW` after path validation.
 
 ## WebSocket behavior