Settings 2-pane deep link vulnerabilities

Settings app must not start an deep link Activity if
1. The deep link Activity is not exported.
or
2. Calling package does not have the permission to
   start the deep link Activity.

Bug: 250589026
Test: make RunSettingsRoboTests ROBOTEST_FILTER=SettingsHomepageActivityTest
Change-Id: I9a3bddfa5d9d1d2e924dd6f3e5e07dca6c11664f
Merged-In: I9a3bddfa5d9d1d2e924dd6f3e5e07dca6c11664f

src/com/android/settings/homepage/SettingsHomepageActivity.java

@@ -25,6 +25,8 @@ import android.app.ActivityManager;
 import android.app.settings.SettingsEnums;
 import android.content.ComponentName;
 import android.content.Intent;
+import android.content.pm.ActivityInfo;
+import android.content.pm.PackageManager;
 import android.content.res.Configuration;
 import android.os.Bundle;
 import android.text.TextUtils;
@@ -38,6 +40,7 @@ import android.widget.FrameLayout;
 import android.widget.ImageView;
 import android.widget.Toolbar;
 
+import androidx.annotation.VisibleForTesting;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentActivity;
 import androidx.fragment.app.FragmentManager;
@@ -55,6 +58,7 @@ import com.android.settings.core.CategoryMixin;
 import com.android.settings.core.FeatureFlags;
 import com.android.settings.homepage.contextualcards.ContextualCardsFragment;
 import com.android.settings.overlay.FeatureFactory;
+import com.android.settings.password.PasswordUtils;
 import com.android.settingslib.Utils;
 import com.android.settingslib.core.lifecycle.HideNonSystemOverlayMixin;
 
@@ -351,6 +355,32 @@ public class SettingsHomepageActivity extends FragmentActivity implements
             finish();
             return;
         }
+
+        if (!TextUtils.equals(PasswordUtils.getCallingAppPackageName(getActivityToken()),
+                getPackageName())) {
+            ActivityInfo targetActivityInfo = null;
+            try {
+                targetActivityInfo = getPackageManager().getActivityInfo(targetComponentName,
+                        /* flags= */ 0);
+            } catch (PackageManager.NameNotFoundException e) {
+                Log.e(TAG, "Failed to get target ActivityInfo: " + e);
+                finish();
+                return;
+            }
+
+            if (!targetActivityInfo.exported) {
+                Log.e(TAG, "Must not launch an unexported Actvity for deep link");
+                finish();
+                return;
+            }
+
+            if (!isCallingAppPermitted(targetActivityInfo.permission)) {
+                Log.e(TAG, "Calling app must have the permission of deep link Activity");
+                finish();
+                return;
+            }
+        }
+
         targetIntent.setComponent(targetComponentName);
 
         // To prevent launchDeepLinkIntentToRight again for configuration change.
@@ -386,6 +416,12 @@ public class SettingsHomepageActivity extends FragmentActivity implements
         startActivity(targetIntent);
     }
 
+    @VisibleForTesting
+    boolean isCallingAppPermitted(String permission) {
+        return TextUtils.isEmpty(permission) || PasswordUtils.isCallingAppPermitted(
+                this, getActivityToken(), permission);
+    }
+
     private String getHighlightMenuKey() {
         final Intent intent = getIntent();
         if (intent != null && TextUtils.equals(intent.getAction(),

tests/robotests/src/com/android/settings/homepage/SettingsHomepageActivityTest.java

@@ -20,6 +20,8 @@ import static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTE
 
 import static com.google.common.truth.Truth.assertThat;
 
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
@@ -37,9 +39,11 @@ import androidx.fragment.app.Fragment;
 import com.android.settings.R;
 import com.android.settings.dashboard.suggestions.SuggestionFeatureProviderImpl;
 import com.android.settings.homepage.contextualcards.slices.BatteryFixSliceTest;
+import com.android.settings.testutils.shadow.ShadowPasswordUtils;
 import com.android.settings.testutils.shadow.ShadowUserManager;
 import com.android.settingslib.core.lifecycle.HideNonSystemOverlayMixin;
 
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -66,6 +70,11 @@ public class SettingsHomepageActivityTest {
         MockitoAnnotations.initMocks(this);
     }
 
+    @After
+    public void tearDown() {
+        ShadowPasswordUtils.reset();
+    }
+
     @Test
     public void launch_shouldHaveAnimationForIaFragment() {
         final SettingsHomepageActivity activity = Robolectric.buildActivity(
@@ -195,6 +204,32 @@ public class SettingsHomepageActivityTest {
                 & SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS).isEqualTo(0);
     }
 
+    @Test
+    @Config(shadows = {ShadowPasswordUtils.class})
+    public void isCallingAppPermitted_emptyPermission_returnTrue() {
+        SettingsHomepageActivity homepageActivity = spy(new SettingsHomepageActivity());
+
+        assertTrue(homepageActivity.isCallingAppPermitted(""));
+    }
+
+    @Test
+    @Config(shadows = {ShadowPasswordUtils.class})
+    public void isCallingAppPermitted_noGrantedPermission_returnFalse() {
+        SettingsHomepageActivity homepageActivity = spy(new SettingsHomepageActivity());
+
+        assertFalse(homepageActivity.isCallingAppPermitted("android.permission.TEST"));
+    }
+
+    @Test
+    @Config(shadows = {ShadowPasswordUtils.class})
+    public void isCallingAppPermitted_grantedPermission_returnTrue() {
+        SettingsHomepageActivity homepageActivity = spy(new SettingsHomepageActivity());
+        String permission = "android.permission.TEST";
+        ShadowPasswordUtils.addGrantedPermission(permission);
+
+        assertTrue(homepageActivity.isCallingAppPermitted(permission));
+    }
+
     @Implements(SuggestionFeatureProviderImpl.class)
     public static class ShadowSuggestionFeatureProviderImpl {