I’m designing a small, controlled macOS test harness.
Two separately signed, sandboxed applications communicate through a UNIX-domain socket in an App Group container. They run as non-root processes in a GUI user session. One application also launches a child that inherits its sandbox and an existing socket descriptor.
Is there a documented, supported OS policy that preserves this IPC arrangement while preventing the test processes from retrieving, using or modifying credentials, including items in their own Data Protection Keychain access groups and reachable file-based keychains? The policy must also prevent creating credential stores/items outside the permitted test resources.
Using a macOS-style TeamID-prefixed App Group avoids that group providing Keychain sharing, but does not establish denial of the remaining Keychain operations. Empty stores, avoiding API calls and relying on users refusing prompts are insufficient for this requirement.
If a different execution context or isolation architecture is required, could you identify the supported mechanism and relevant documentation? I’m seeking platform guidance, without relying on private APIs or unsupported custom sandbox profiles.