The FlushCaches and ResetServerFeatures D-Bus methods perform destructive operations (flushing all DNS caches and resetting server feature negotiation including DNS-over-TLS state) without any authorization check. The corresponding Varlink methods already enforce polkit via verify_polkit(), but the D-Bus handlers were not updated. Add bus_verify_polkit_async() calls to both methods, matching the pattern used by ResetStatistics. Add the corresponding policy actions to the polkit policy file.
System and Service Manager
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