Addresses security/correctness audit findings in the target-plugin control
plane, TLS reload coordinator, and runtime extension registries.
control_plane (backlog#977):
- Install now preserves the currently installed revision as previous_revision
so Rollback actually restores the prior version instead of a no-op.
- Split the gate: circuit-breaker and runtime-activation checks apply only to
Install/Enable; Disable and Rollback stay available as break-glass
remediation while the breaker is open.
- Enforce the sidecar runtime protocol version for every external transport
(previously skippable by declaring a non-gRPC transport) and validate the
plugin api_compatibility_version at planning time.
- Download/signature/provenance host allowlisting now matches the full
host authority, so an allowlisted host never implicitly authorizes a
different host:port.
TLS reload coordinator/validate (backlog#981, #970-coordinator):
- Compute the fingerprint before building material in register() to remove the
TOCTOU that could permanently pin an old certificate; rotation self-heals.
- Always start a detection loop when reload is enabled; Watch mode no longer
returns success without any loop.
- validate_cert_key_pairing now verifies the private key matches the
certificate's public key instead of only parsing both files.
- Normalize a zero poll interval to a positive minimum to avoid a panic that
silently killed the poll loop.
- Serialize reload cycles with a per-target mutex; a first-step fingerprint
read failure now records last_error and a failure metric.
- Duplicate label registration stops and joins the previous loop before
publishing the replacement (stop-before-start), preventing orphaned loops.
runtime extension points (backlog#983 runtime subset):
- ops_profiler/ops_diagnostics authorize before probing the registry so an
unauthorized caller cannot learn whether a backend/surface exists.
- s3_hooks dispatch_post_auth actually traverses the registered hooks for the
point instead of unconditionally returning Continue.
- sidecar send_with_timeout redacts errors and uses the configurable failure
threshold via policy, and a successful send resets the breaker accounting.
Relates to rustfs/backlog#977
Relates to rustfs/backlog#981
Relates to rustfs/backlog#970
Relates to rustfs/backlog#983
Co-authored-by: heihutu <heihutu@gmail.com>
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