Note: If you request a temporary exception entitlement, be sure to follow the guidance regarding entitlements provided on the iTunes Connect website. entitlements property list file directly. To work with temporary exception entitlements, use the Xcode property list editor to edit a target’s. For example, you might request a temporary exception entitlement because App Sandbox does not support a capability your app needs, such as the ability to send an Apple event to an app that does not yet provide any scripting access groups. You may require finer-grained control over your app’s entitlements than is available in the Xcode target editor. You learn more about this in External Tools, XPC Services, and Privilege Separation. If you design your app to use a main application along with helpers (in the form of XPC services), you request entitlements individually, and as appropriate, for each target. If your app has a single target-the main application-you request entitlements only for that target. You request entitlements on a target-by-target basis. If you don’t require a capability, take care to not include the corresponding entitlement. If your app requires a capability, request it by adding the corresponding entitlement to your Xcode project using the Summary tab of the target editor. entitlements property list file and shows it in the project navigator. When you enable sandboxing, Xcode creates a. One special entitlement-Enable App Sandboxing-turns on App Sandbox.
An entitlement is a key-value pair that identifies a specific capability, such as the capability to open an outbound network socket.
When you enable App Sandbox for your app, you remove all but a minimal set of privileges and then deliberately restore them, one-by-one, using entitlements. If successfully attacked by malicious code, such an app can behave as a hostile agent with wide-ranging potential to inflict harm. Partition functionality, then distrust each partĪn app that is not sandboxed has access to all user-accessible system resources-including the built-in camera and microphone, network sockets, printing, and most of the file system. Take advantage of access throughout your app To successfully adopt App Sandbox, use a different mindset than you might be accustomed to, as suggested in Table 2-1.
APPLE SANDBOX FILE TYPE PDF CODE
If malicious code gains control of a properly sandboxed app, it is left with access to only the files and resources in the app’s sandbox. The system then grants your app only the access your app needs to get its job done. An attacker needs only to find a single hole in your defenses, or in any of the frameworks and libraries that you link against, to gain control of your app’s interactions with the system.Īpp Sandbox is designed to confront this scenario head on by letting you describe your app’s intended interactions with the system. But despite your best efforts to build an invulnerable barrier-by avoiding buffer overflows and other memory corruptions, preventing exposure of user data, and eliminating other vulnerabilities-your app can be exploited by malicious code. You secure your app against attack from malware by following the practices recommended in Secure Coding Guide. Split your app into smaller parts, each with its own resource privileges, minimizing the damage if any one part becomes compromised.
Unambiguously identify your app to the system so another app cannot masquerade as yours. Retain security-scoped bookmarks across launches of your app to any additional files to which the user has specifically granted your app access.Ĭode Signing. Access only the files and directories considered safe for your app. Communicate to macOS the specific system resources your app needs to get its job done, and no more.Ĭontainers.
The specific steps you take to adopt App Sandbox are unique to your app, but the access control mechanisms used by App Sandbox to protect user data remain consistent:Įntitlements.
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