[Autofill Auth] Fixing crashes caused by cancelling WebAuthn dialog

This CL maintains the reference to the C++ instance, and handles the
null response case better.

Bug: 949269
Change-Id: I3bb453286d8a1f8c8f087787235a664570e2c259
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2200045Reviewed-by: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Commit-Queue: Manas Verma <manasverma@google.com>
Cr-Commit-Position: refs/heads/master@{#772413}

chrome/android/BUILD.gn

@@ -896,6 +896,7 @@ android_library("chrome_test_java") {
     "$google_play_services_package:google_play_services_tasks_java",
     "//base:base_java",
     "//base:base_java_test_support",
+    "//base:jni_java",
     "//base/test:test_support_java",
     "//chrome/android:app_hooks_java",
     "//chrome/android:chrome_java",

chrome/android/java/src/org/chromium/chrome/browser/webauth/AuthenticatorImpl.java

@@ -8,6 +8,7 @@ import android.annotation.TargetApi;
 import android.content.Context;
 import android.os.Build;
 
+import org.chromium.base.ContextUtils;
 import org.chromium.base.PackageUtils;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.NativeMethods;
@@ -17,11 +18,8 @@ import org.chromium.blink.mojom.GetAssertionAuthenticatorResponse;
 import org.chromium.blink.mojom.MakeCredentialAuthenticatorResponse;
 import org.chromium.blink.mojom.PublicKeyCredentialCreationOptions;
 import org.chromium.blink.mojom.PublicKeyCredentialRequestOptions;
-import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.flags.ChromeFeatureList;
 import org.chromium.content_public.browser.RenderFrameHost;
-import org.chromium.content_public.browser.WebContents;
-import org.chromium.content_public.browser.WebContentsStatics;
 import org.chromium.mojo.system.MojoException;
 import org.chromium.url.Origin;
 
@@ -37,7 +35,6 @@ import java.util.Queue;
  */
 public class AuthenticatorImpl extends HandlerResponseCallback implements Authenticator {
     private final RenderFrameHost mRenderFrameHost;
-    private final WebContents mWebContents;
 
     private static final String GMSCORE_PACKAGE_NAME = "com.google.android.gms";
 
@@ -71,7 +68,6 @@ public class AuthenticatorImpl extends HandlerResponseCallback implements Authen
         assert renderFrameHost != null;
         mRenderFrameHost = renderFrameHost;
         mOrigin = mRenderFrameHost.getLastCommittedOrigin();
-        mWebContents = WebContentsStatics.fromRenderFrameHost(renderFrameHost);
     }
 
     private AuthenticatorImpl(
@@ -105,7 +101,7 @@ public class AuthenticatorImpl extends HandlerResponseCallback implements Authen
         }
 
         mMakeCredentialCallback = callback;
-        Context context = ChromeActivity.fromWebContents(mWebContents);
+        Context context = ContextUtils.getApplicationContext();
         if (PackageUtils.getPackageVersion(context, GMSCORE_PACKAGE_NAME)
                 < Fido2ApiHandler.GMSCORE_MIN_VERSION) {
             onError(AuthenticatorStatus.NOT_IMPLEMENTED);
@@ -127,7 +123,7 @@ public class AuthenticatorImpl extends HandlerResponseCallback implements Authen
                 (status, response)
                         -> AuthenticatorImplJni.get().invokeMakeCredentialResponse(
                                 mNativeInternalAuthenticatorAndroid, status.intValue(),
-                                response == null ? ByteBuffer.allocate(0) : response.serialize()));
+                                response == null ? null : response.serialize()));
     }
 
     @Override
@@ -139,7 +135,8 @@ public class AuthenticatorImpl extends HandlerResponseCallback implements Authen
         }
 
         mGetAssertionCallback = callback;
-        Context context = ChromeActivity.fromWebContents(mWebContents);
+        Context context = ContextUtils.getApplicationContext();
+
         if (PackageUtils.getPackageVersion(context, GMSCORE_PACKAGE_NAME)
                 < Fido2ApiHandler.GMSCORE_MIN_VERSION) {
             onError(AuthenticatorStatus.NOT_IMPLEMENTED);
@@ -161,14 +158,14 @@ public class AuthenticatorImpl extends HandlerResponseCallback implements Authen
                 (status, response)
                         -> AuthenticatorImplJni.get().invokeGetAssertionResponse(
                                 mNativeInternalAuthenticatorAndroid, status.intValue(),
-                                response == null ? ByteBuffer.allocate(0) : response.serialize()));
+                                response == null ? null : response.serialize()));
     }
 
     @Override
     @TargetApi(Build.VERSION_CODES.N)
     public void isUserVerifyingPlatformAuthenticatorAvailable(
             IsUserVerifyingPlatformAuthenticatorAvailableResponse callback) {
-        Context context = ChromeActivity.fromWebContents(mWebContents);
+        Context context = ContextUtils.getApplicationContext();
         // ChromeActivity could be null.
         if (context == null) {
             callback.call(false);
@@ -263,7 +260,6 @@ public class AuthenticatorImpl extends HandlerResponseCallback implements Authen
         mIsOperationPending = false;
         mMakeCredentialCallback = null;
         mGetAssertionCallback = null;
-        mNativeInternalAuthenticatorAndroid = null;
     }
 
     @Override

chrome/android/javatests/src/org/chromium/chrome/browser/webauth/Fido2ApiTestHelper.java

@@ -20,6 +20,7 @@ import org.junit.Assert;
 
 import org.chromium.blink.mojom.AuthenticatorAttachment;
 import org.chromium.blink.mojom.AuthenticatorSelectionCriteria;
+import org.chromium.blink.mojom.CableAuthentication;
 import org.chromium.blink.mojom.GetAssertionAuthenticatorResponse;
 import org.chromium.blink.mojom.MakeCredentialAuthenticatorResponse;
 import org.chromium.blink.mojom.PublicKeyCredentialCreationOptions;
@@ -283,6 +284,8 @@ public class Fido2ApiTestHelper {
         descriptor.id = new byte[] {8, 7, 6};
         descriptor.transports = new int[] {0};
         options.allowCredentials = new PublicKeyCredentialDescriptor[] {descriptor};
+
+        options.cableAuthenticationData = new CableAuthentication[] {};
         return options;
     }
 

chrome/browser/autofill/android/internal_authenticator_android.cc

@@ -123,10 +123,14 @@ void InternalAuthenticatorAndroid::InvokeMakeCredentialResponse(
     jint status,
     const base::android::JavaParamRef<jobject>& byte_buffer) {
   blink::mojom::MakeCredentialAuthenticatorResponsePtr response;
+
+  // |byte_buffer| may be null if authentication failed.
+  if (byte_buffer) {
     blink::mojom::MakeCredentialAuthenticatorResponse::Deserialize(
         std::move(payments::android::JavaByteBufferToNativeByteVector(
             env, byte_buffer)),
         &response);
+  }
 
   std::move(make_credential_response_callback_)
       .Run(static_cast<blink::mojom::AuthenticatorStatus>(status),
@@ -138,10 +142,14 @@ void InternalAuthenticatorAndroid::InvokeGetAssertionResponse(
     jint status,
     const base::android::JavaParamRef<jobject>& byte_buffer) {
   blink::mojom::GetAssertionAuthenticatorResponsePtr response;
+
+  // |byte_buffer| may be null if authentication failed.
+  if (byte_buffer) {
     blink::mojom::GetAssertionAuthenticatorResponse::Deserialize(
         std::move(payments::android::JavaByteBufferToNativeByteVector(
             env, byte_buffer)),
         &response);
+  }
 
   std::move(get_assertion_response_callback_)
       .Run(static_cast<blink::mojom::AuthenticatorStatus>(status),