虚假越狱检测

Question

以下代码检测越狱设备：

BOOL isJailbroken() {
#if !(TARGET_IPHONE_SIMULATOR)

    if ([[NSFileManager defaultManager] fileExistsAtPath:@"/Applications/Cydia.app"] ||
        [[NSFileManager defaultManager] fileExistsAtPath:@"/Library/MobileSubstrate/MobileSubstrate.dylib"] ||
        [[NSFileManager defaultManager] fileExistsAtPath:@"/bin/bash"] ||
        [[NSFileManager defaultManager] fileExistsAtPath:@"/usr/sbin/sshd"] ||
        [[NSFileManager defaultManager] fileExistsAtPath:@"/etc/apt"] ||
        [[NSFileManager defaultManager] fileExistsAtPath:@"/private/var/lib/apt/"] ||
        [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"cydia://package/com.example.package"]])  {
        return YES;
    }

    FILE *f = NULL ;
    if ((f = fopen("/bin/bash", "r")) ||
        (f = fopen("/Applications/Cydia.app", "r")) ||
        (f = fopen("/Library/MobileSubstrate/MobileSubstrate.dylib", "r")) ||
        (f = fopen("/usr/sbin/sshd", "r")) ||
        (f = fopen("/etc/apt", "r")))  {
        fclose(f);
        return YES;
    }
    fclose(f);

    NSError *error;
    NSString *stringToBeWritten = @"afa s";
    [stringToBeWritten writeToFile:@"/private/jailbreak.txt" atomically:YES encoding:NSUTF8StringEncoding error:&error];
    [[NSFileManager defaultManager] removeItemAtPath:@"/private/jailbreak.txt" error:nil];
    if(error == nil)
    {
        return YES;
    }

#endif

    return NO;
}

我们有很多客户声称他们的设备是全新的，但上面提到的代码在他们的设备上返回YES，因为/ private / var / lib / apt路径存在。

这是正常的吗？他们在说谎吗？是卖家说谎还是苹果公司在发货之前在他们的某些设备上做了一些奇怪的事情？