Feature/additional checks

README.md

@@ -21,6 +21,9 @@ Already implemented Features are:
 - [x] Jailbreak or Root Detection
 - [x] Hooks Detection
 - [x] Simulator Detection
+- [x] Debugger Detection
+- [x] Device Passcode Check
+- [x] Hardware Security Check
 
 You can see them in action with the [Example App](./SecurityToolkitExample) we've provided
 
@@ -62,10 +65,8 @@ Use Async Stream API to get detected threats asynchronously:
 
 Next features to be implemented:
 - [ ] App Signature Check
-- [ ] Debugger Detection
-- [ ] Device Passcode Check
 - [ ] Integrity Check
-- [ ] Hardware Security Check
+
 
 ## Contributing
 

SecurityToolkitExample/SecurityToolkitExample/Resources/en.lproj/Localizable.strings

@@ -6,7 +6,11 @@
 "threat.simulator.title" = "Simulator";
 "threat.simulator.description" = "Running the application in a simulator";
 "threat.debugger.title" = "Debugger";
-"threat.debugger.description" = "A tool that allows developers to inspect and modify the execution of a program in real-time, potentially exposing sensitive data or allowing unauthorized control.";
+"threat.debugger.description" = "A tool that allows developers to inspect and modify the execution of a program in real-time, potentially exposing sensitive data or allowing unauthorized control";
+"threat.passcodeUnprotectedDevice.title" = "Passcode";
+"threat.passcodeUnprotectedDevice.description" = "Indicates if current device is unprotected with a passcode. Biometric protection requires a passcode to be set up";
+"threat.hardware.title" = "Hardware protection";
+"threat.hardware.description" = "Refers to hardware capabilities of current device, specific to Secure Enclave layer. If not available, no additional hardware security layer can be used when working with keys, certificates and keychain";
 
 // MARK: Threat List
 "threat.list.title" = "Protection";

SecurityToolkitExample/SecurityToolkitExample/Sources/ThreatStatus.swift

@@ -25,7 +25,17 @@ struct ThreatStatus: Hashable {
         ThreatStatus(
             title: R.string.localizable.threatDebuggerTitle(),
             description: R.string.localizable.threatDebuggerDescription(),
-            isDetected: ThreatDetectionCenter.isDebuggerDetected
+            isDetected: ThreatDetectionCenter.isDebuggerDetected ?? false
+        ),
+        ThreatStatus(
+            title: R.string.localizable.threatPasscodeUnprotectedDeviceTitle(),
+            description: R.string.localizable.threatPasscodeUnprotectedDeviceDescription(),
+            isDetected: ThreatDetectionCenter.isDeviceWithoutPasscodeDetected
+        ),
+        ThreatStatus(
+            title: R.string.localizable.threatHardwareTitle(),
+            description: R.string.localizable.threatHardwareDescription(),
+            isDetected: ThreatDetectionCenter.isHardwareProtectionUnavailable
         ),
     ]
 }

Sources/ThreatDetectionCenter.swift

@@ -1,33 +1,95 @@
 import Foundation
 
 public final class ThreatDetectionCenter {
-
+
+    /// Will check if jailbreak is present
+    ///
+    /// - Returns:
+    ///  `true`, if device is / was jailbroken;
+    ///  `false` otherwise
+    ///
+    /// More about jailbreak: https://wikipedia.org/wiki/Jailbreak_%28iOS%29
+    ///
+    /// > Should also detect jailbreak, even if the device is in a "safe" mode or
+    /// jailbreak mode is not active / was not properly removed
     public static var areRootPrivilegesDetected: Bool {
         JailbreakDetection.threatDetected()
     }
-
+
+    /// Will check for an injection tool like Frida
+    ///
+    /// - Returns:
+    ///  `true`, if dynamic hooks are loaded at the time;
+    ///  `false` otherwise
+    ///
+    /// More: https://fingerprint.com/blog/exploring-frida-dynamic-instrumentation-tool-kit/
+    ///
+    /// > By the nature of dynamic hooks, this checks should be made on a regular
+    /// basis, given the attacker may chose to hook a function at a later time
+    /// after the app started
+    ///
+    /// > Important: with a sufficient reverse engineering skills, this check can
+    /// be disabled. Use always in combination with another threats detections.
     public static var areHooksDetected: Bool {
         HooksDetection.threatDetected()
     }
-
+
+    /// Will check, if the app runs in a emulated / simulated environment
+    ///
+    /// - Returns:
+    ///  `true`, if simulator environment is detected;
+    ///  `false` otherwise
     public static var isSimulatorDetected: Bool {
         SimulatorDetection.threatDetected()
     }
 
-    /// Will check if your application is being traced by a debugger.
+    /// Will check, if the application is being traced by a debugger.
     ///
     /// - Returns:
-    ///   `true`: If a debugger is detected.
-    ///   `false`: If no debugger is detected.
-    ///   `nil`: The detection process did not produce a definitive result. This could happen due to system limitations, lack of required permissions, or other undefined conditions.
+    ///   `true`, if a debugger is detected;
+    ///   `false`, if no debugger is detected;
+    ///   `nil`, if the detection process did not produce a definitive result.
+    ///   This could happen due to system limitations, lack of required
+    ///   permissions, or other undefined conditions.
     ///
-    /// A debugger is a tool that allows developers to inspect and modify the execution of a program in real-time, potentially exposing sensitive data or allowing unauthorized control.
+    /// A debugger is a tool that allows developers to inspect and modify the
+    /// execution of a program in real-time, potentially exposing sensitive data
+    /// or allowing unauthorized control.
     ///
-    /// ## Notes
-    /// Please note that Apple itself may require a debugger for the app review process.
+    /// > Please note that Apple itself may require a debugger for the app review
+    /// process.
     public static var isDebuggerDetected: Bool? {
         DebuggerDetection.threatDetected()
     }
+
+    /// Will check, if current device is protected with at least a passcode
+    ///
+    /// - Returns:
+    ///  `true`, if device is unprotected;
+    ///  `false`, if device is protected with at least a passcode
+    public static var isDeviceWithoutPasscodeDetected: Bool {
+        DevicePasscodeDetection.threatDetected()
+    }
+
+    /// Will check, if current device has hardware protection layer
+    /// (Secure Enclave)
+    ///
+    /// More: https://support.apple.com/en-us/guide/security/secf020d1074/web
+    ///
+    /// More: https://developer.apple.com/documentation/security/protecting-keys-with-the-secure-enclave
+    ///
+    /// - Returns:
+    ///  `true`, if device has no hardware protection;
+    ///  `false` otherwise
+    ///
+    /// > Should be evaluated on a real device. Should only be used as an
+    /// indicator, if current device is capable of hardware protection. Does not
+    /// automatically mean, that encryption operations (keys, certificates,
+    /// keychain) are always backed by hardware. You should make sure, such
+    /// operations are implemented correctly with hardware layer
+    public static var isHardwareProtectionUnavailable: Bool {
+        HardwareSecurityDetection.threatDetected()
+    }
 
 
 	// MARK: - Async Threat Detection
@@ -38,6 +100,8 @@ public final class ThreatDetectionCenter {
         case hooks
         case simulator
         case debugger
+        case deviceWithoutPasscode
+        case hardwareProtectionUnavailable
     }
 
 	/// Stream that contains possible threats that could be detected
@@ -59,7 +123,15 @@ public final class ThreatDetectionCenter {
             if DebuggerDetection.threatDetected() ?? false {
                 continuation.yield(.debugger)
             }
+
+            if DevicePasscodeDetection.threatDetected() {
+                continuation.yield(.deviceWithoutPasscode)
+            }
 
+            if HardwareSecurityDetection.threatDetected() {
+                continuation.yield(.hardwareProtectionUnavailable)
+            }
+
             continuation.finish()
         }
     }

Sources/DebuggerDetection.swift → Sources/internal/DebuggerDetection.swift

@@ -15,7 +15,8 @@ fileprivate extension DebuggerDetection {
     /// if the process is traced
     private static func hasTracerFlagSet() -> Bool? {
         var info = kinfo_proc()
-        var mib: [Int32] = [CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid()] // Kernel info, process info, specific process by PID, get current process ID
+        // Kernel info, process info, specific process by PID, get current process ID
+        var mib: [Int32] = [CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid()]
         var size = MemoryLayout.stride(ofValue: info)
 
         let unixStatusCode = sysctl(&mib, u_int(mib.count), &info, &size, nil, 0)

Sources/internal/DevicePasscodeDetection.swift

@@ -0,0 +1,31 @@
+import Foundation
+import LocalAuthentication
+
+// MARK: - Internal
+internal final class DevicePasscodeDetection {
+
+    static func threatDetected() -> Bool {
+        !hasDevicePasscode()
+    }
+}
+
+// MARK: - Private
+fileprivate extension DevicePasscodeDetection {
+
+    /// Will check if the user can perform authentication with a biometrics or
+    /// a passcode
+    private static func hasDevicePasscode() -> Bool {
+        var error: NSError?
+        let result = LAContext().canEvaluatePolicy(
+            .deviceOwnerAuthentication,
+            error: &error
+        )
+        if result {
+            return true
+        } else if let error {
+            return error.code != LAError.passcodeNotSet.rawValue
+        } else {
+            return false
+        }
+    }
+}

Sources/internal/HardwareSecurityDetection.swift

@@ -0,0 +1,35 @@
+import Foundation
+import LocalAuthentication
+
+// MARK: - Internal
+internal final class HardwareSecurityDetection {
+
+    static func threatDetected() -> Bool {
+        !isSecureEnclaveAvailable()
+    }
+}
+
+// MARK: - Private
+fileprivate extension HardwareSecurityDetection {
+
+    /// See https://stackoverflow.com/a/49318485/7484013
+    private static func isSecureEnclaveAvailable() -> Bool {
+        var error: NSError?
+
+        /// Policies can have certain requirements which, when not satisfied,
+        /// would always cause the policy evaluation to fail - e.g. a passcode
+        /// set, a fingerprint enrolled with Touch ID or a face set up with
+        /// Face ID. This method allows easy checking for such conditions.
+        let result = LAContext().canEvaluatePolicy(
+            .deviceOwnerAuthenticationWithBiometrics,
+            error: &error
+        )
+        if result {
+            return true
+        } else if let error {
+            return error.code != LAError.biometryNotAvailable.rawValue
+        } else {
+            return false
+        }
+    }
+}