RCORE-2070 Allow setting a security access group for the metadata realm keychain #7552
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Access groups are shared storage for one or more apps on iOS (and other Apple platforms). Sharing a metadata Realm between apps requires placing the file in the access group storage and storing the encryption key in the access group's keychain. Including the bundle ID in the service name breaks sharing the key between apps, as different apps will have different bundle IDs. For everything but un-sandboxed macOS there wasn't actually any reason to include the bundle ID in the first place, as each app has its own keychain anyway. As such, this switches back to not including it. On macOS this continues to include the bundle ID when not using an access group, as otherwise different applications could conflict with each other. This means that sharing users between macOS applications will currently only work if an encryption key is explicitly set or if the applications have sandboxing enabled. Since this is slightly changing how keys are stored anyway, it also switches to using unique keys per server app ID rather than always using "metadata" as the account name. The keychain code was mostly multiprocess-safe, but there was one race condition when two apps generated a new key at once which is fixed.
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Access groups are shared storage for one or more apps on iOS (and other Apple platforms). Sharing a metadata Realm between apps requires placing the file in the access group storage and storing the encryption key in the access group's keychain.
Including the bundle ID in the service name breaks sharing the key between apps, as different apps will have different bundle IDs. For everything but un-sandboxed macOS there wasn't actually any reason to include the bundle ID in the first place, as each app has its own keychain anyway. As such, this switches back to not including it. On macOS this continues to include the bundle ID when not using an access group, as otherwise different applications could conflict with each other. This means that sharing users between macOS applications will currently only work if an encryption key is explicitly set or if the applications have sandboxing enabled.
Since this is slightly changing how keys are stored anyway, it also switches to using unique keys per server app ID rather than always using "metadata" as the account name.
The keychain code was mostly multiprocess-safe, but there was one race condition when two apps generated a new key at once which is fixed.