How do I detect if my app is sandboxed?

Question

I have an application that is targeted to run in both sandboxed and non-sandboxed MacOS. If a user upgrades from MacOS 10.6 to a later OS I need the user to re-pick folders so I can bookmark them with secure bookmarks.

How do I detect that my application is on an OS that supports sandboxing?

Answer 1

The only way I know of is to look for APP_SANDBOX_CONTAINER_ID environment variable. It is present when the app is running inside a sandbox container.

NSDictionary* environ = [[NSProcessInfo processInfo] environment];
BOOL inSandbox = (nil != [environ objectForKey:@"APP_SANDBOX_CONTAINER_ID"]);

Answer 2

BOOL isSandboxed = NO;

SecStaticCodeRef staticCode = NULL;
NSURL *bundleURL = [[NSBundle mainBundle] bundleURL];

if (SecStaticCodeCreateWithPath((__bridge CFURLRef)bundleURL, kSecCSDefaultFlags, &staticCode) == errSecSuccess) {
    if (SecStaticCodeCheckValidityWithErrors(staticCode, kSecCSBasicValidateOnly, NULL, NULL) == errSecSuccess) {
        SecRequirementRef sandboxRequirement;
        if (SecRequirementCreateWithString(CFSTR("entitlement[\"com.apple.security.app-sandbox\"] exists"), kSecCSDefaultFlags,
                                       &sandboxRequirement) == errSecSuccess)
        {
            OSStatus codeCheckResult = SecStaticCodeCheckValidityWithErrors(staticCode, kSecCSBasicValidateOnly, sandboxRequirement, NULL);
            if (codeCheckResult == errSecSuccess) {
                isSandboxed = YES;
            }
        }
    }
    CFRelease(staticCode);
}