How to detect that the app is running on a jailbroken device? [duplicate]

Answer 1

There are many ways to find the jailbroken devices. checking cydia technic will not be work if skilled hacker changes the application path.

A good way to check for it would be to see if we can modify a file in some other location outside the application bundle.

NSError *error;
NSString *stringToBeWritten = @"This is a test.";
[stringToBeWritten writeToFile:@"/private/jailbreak.txt" atomically:YES
         encoding:NSUTF8StringEncoding error:&error];
if(error==nil){
   //Device is jailbroken
   return YES;
 } else {
   //Device is not jailbroken
   [[NSFileManager defaultManager] removeItemAtPath:@"/private/jailbreak.txt" error:nil];
 }

Find more techniques in the below url

http://highaltitudehacks.com/2013/12/17/ios-application-security-part-24-jailbreak-detection-and-evasion/

Answer 2

There is no way to detect if device is jailbroken.

Consider that even if there was, the device has already been jailbroken, meaning arbitrary code execution is possible, and the jailbreaker would just modify whatever method of detection you would use to signal that the device has not been jailbroken.

reference: https://forums.developer.apple.com/thread/43073

credits go to Apple Staff who answered this same question

Answer 3

SWIFT 3:

func hasJailbreak() -> Bool {
        #if arch(i386) || arch(x86_64)
            print("Simulator")
            return false
        #else
            return FileManager.default.fileExistsAtPath("/private/var/lib/apt")
        #endif
    }

Answer 4

You can detect if a device is jailBroken or not by checking the following

1. Cydia is installed
2. Verify some of the system paths
3. Can perform a sandbox integrity check
4. Perform symlink verification
5. Verify whether you create and write files outside your Sandbox

There is an open source library I created from various articles and books, try it out.

Answer 5

-(BOOL) isJailbroken
{
#if TARGET_IPHONE_SIMULATOR
return NO;
#else
FILE *f = fopen("/bin/bash", "r");
if (errno == ENOENT)
{
    // device is NOT jailbroken
    fclose(f);
    NSLog(@"no");
    return NO;
}
else {
    // device IS jailbroken
    fclose(f);
    NSLog(@"yes");
    return YES;

}
#endif
}

Answer 6

/**
     Detect that the app is running on a jailbroken device or not

     - returns: bool value for jailbroken device or not
     */
    public class func isDeviceJailbroken() -> Bool {
        #if arch(i386) || arch(x86_64)
            return false
        #else
            let fileManager = FileManager.default

            if (fileManager.fileExists(atPath: "/bin/bash") ||
                fileManager.fileExists(atPath: "/usr/sbin/sshd") ||
                fileManager.fileExists(atPath: "/etc/apt")) ||
                fileManager.fileExists(atPath: "/private/var/lib/apt/") ||
                fileManager.fileExists(atPath: "/Applications/Cydia.app") ||
                fileManager.fileExists(atPath: "/Library/MobileSubstrate/MobileSubstrate.dylib") {
                return true
            } else {
                return false
            }
        #endif
    }