Add check if device is jailbroken

[lukasz-lenkiewicz]

var isJailBroken: Bool {
        if UIDevice.current.type != .simulator {
            // Check 1 : existence of files that are common for jailbroken devices
            if FileManager.default.fileExists(atPath: "/Applications/Cydia.app")
                || FileManager.default.fileExists(atPath: "/Library/MobileSubstrate/MobileSubstrate.dylib")
                || FileManager.default.fileExists(atPath: "/bin/bash")
                || FileManager.default.fileExists(atPath: "/usr/sbin/sshd")
                || FileManager.default.fileExists(atPath: "/etc/apt")
                || FileManager.default.fileExists(atPath: "/private/var/lib/apt/")
                || UIApplication.shared.canOpenURL(URL(string:"cydia://package/com.example.package")!)
                    {
                    return true
            }
            // Check 2 : Reading and writing in system directories (sandbox violation)
            let stringToWrite = "Jailbreak Test"
            do {
                try stringToWrite.write(toFile:"/private/JailbreakTest.txt", atomically:true, encoding:String.Encoding.utf8)
                //Device is jailbroken
                return true
            }catch {
                return false
            }
        } else {
            return false
        }
    }

source: https://medium.com/@pinmadhon/how-to-check-your-app-is-installed-on-a-jailbroken-device-67fa0170cf56 - suggested by pen test specialist.

[lukasz-lenkiewicz]

#56