Support FIDO2 authentication with devices that don’t have a PIN code

Xcodes.xcodeproj/project.pbxproj

@@ -1493,7 +1493,7 @@
 			repositoryURL = "https://github.com/kinoroy/LibFido2Swift.git";
 			requirement = {
 				kind = upToNextMinorVersion;
-				minimumVersion = 0.1.0;
+				minimumVersion = 0.1.4;
 			};
 		};
 		CA9FF86B25951C6E00E47BAF /* XCRemoteSwiftPackageReference "data" */ = {

Xcodes/Backend/AppState.swift

@@ -305,11 +305,17 @@ class AppState: ObservableObject {
     }
 
     func handleTwoFactorOption(_ option: TwoFactorOption, authOptions: AuthOptionsResponse, serviceKey: String, sessionID: String, scnt: String) {
-        self.presentedSheet = .twoFactor(.init(
-            option: option,
-            authOptions: authOptions,
-            sessionData: AppleSessionData(serviceKey: serviceKey, sessionID: sessionID, scnt: scnt)
-        ))
+        let sessionData = AppleSessionData(serviceKey: serviceKey, sessionID: sessionID, scnt: scnt)
+
+        if option == .securityKey, fido2DeviceIsPresent() && !fido2DeviceNeedsPin() {
+            createAndSubmitSecurityKeyAssertationWithPinCode(nil, sessionData: sessionData, authOptions: authOptions)
+        } else {
+            self.presentedSheet = .twoFactor(.init(
+                option: option,
+                authOptions: authOptions,
+                sessionData: sessionData
+            ))
+        }
     }
 
     func requestSMS(to trustedPhoneNumber: AuthOptionsResponse.TrustedPhoneNumber, authOptions: AuthOptionsResponse, sessionData: AppleSessionData) {        
@@ -355,9 +361,9 @@ class AppState: ObservableObject {
             .store(in: &cancellables)
     }
 
-    var fido2: FIDO2?
-    
-    func createAndSubmitSecurityKeyAssertationWithPinCode(_ pinCode: String, sessionData: AppleSessionData, authOptions: AuthOptionsResponse) {
+    private lazy var fido2 = FIDO2()
+
+    func createAndSubmitSecurityKeyAssertationWithPinCode(_ pinCode: String?, sessionData: AppleSessionData, authOptions: AuthOptionsResponse) {
         self.presentedSheet = .securityKeyTouchToConfirm
 
         guard let fsaChallenge = authOptions.fsaChallenge else {
@@ -379,8 +385,6 @@ class AppState: ObservableObject {
 
         Task {
             do {
-                let fido2 = FIDO2()
-                self.fido2 = fido2
                 let response = try fido2.respondToChallenge(args: ChallengeArgs(rpId: rpId, validCredentials: validCreds, devPin: pinCode, challenge: challenge, origin: origin))
 
                 Task { @MainActor in
@@ -407,13 +411,31 @@ class AppState: ObservableObject {
                 // we don't have to show an error
                 // because the sheet will already be dismissed
             } catch {
+                Task { @MainActor in
+                    authError = error
+                }
+            }
+        }
+    }
+
+    func fido2DeviceIsPresent() -> Bool {
+        fido2.hasDeviceAttached()
+    }
+
+    func fido2DeviceNeedsPin() -> Bool {
+        do {
+            return try fido2.deviceHasPin()
+        } catch {
+            Task { @MainActor in
                 authError = error
             }
+
+            return true
         }
     }
 
     func cancelSecurityKeyAssertationRequest() {
-        self.fido2?.cancel()
+        self.fido2.cancel()
     }
 
     private func handleAuthenticationFlowCompletion(_ completion: Subscribers.Completion<Error>) {

Xcodes/Frontend/SignIn/SignInSecurityKeyPinView.swift

@@ -32,6 +32,9 @@ struct SignInSecurityKeyPinView: View {
                 Button("Cancel", action: { isPresented = false })
                     .keyboardShortcut(.cancelAction)
                 Spacer()
+
+                Button("PIN not set", action: submitWithoutPinCode)
+
                 ProgressButton(isInProgress: appState.isProcessingAuthRequest,
                                action: submitPinCode) {
                     Text("Continue")
@@ -50,6 +53,10 @@ struct SignInSecurityKeyPinView: View {
     func submitPinCode() {
         appState.createAndSubmitSecurityKeyAssertationWithPinCode(pin, sessionData: sessionData, authOptions: authOptions)
     }
+
+    func submitWithoutPinCode() {
+        appState.createAndSubmitSecurityKeyAssertationWithPinCode(nil, sessionData: sessionData, authOptions: authOptions)
+    }
 }
 
 #Preview {

Xcodes/Resources/Localizable.xcstrings

@@ -237,6 +237,16 @@
         }
       }
     },
+    "%@ (%@)" : {
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "new",
+            "value" : "%1$@ (%2$@)"
+          }
+        }
+      }
+    },
     "%@ %@ %@" : {
       "localizations" : {
         "ar" : {
@@ -17907,6 +17917,9 @@
           }
         }
       }
+    },
+    "PIN not set" : {
+
     },
     "Platforms" : {
       "localizations" : {