Set verified stamps to be trusted

Bug: 148006415
Test: atest FrameworksServicesTests:AppIntegrityManagerServiceImplTest
Change-Id: I61d8d7032580d158e1bccac8f571576447248860

services/core/java/com/android/server/integrity/AppIntegrityManagerServiceImpl.java

@@ -52,7 +52,6 @@ import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.UserHandle;
 import android.provider.Settings;
-import android.security.FileIntegrityManager;
 import android.util.Slog;
 import android.util.apk.SourceStampVerificationResult;
 import android.util.apk.SourceStampVerifier;
@@ -122,7 +121,6 @@ public class AppIntegrityManagerServiceImpl extends IAppIntegrityManager.Stub {
     private final PackageManagerInternal mPackageManagerInternal;
     private final RuleEvaluationEngine mEvaluationEngine;
     private final IntegrityFileManager mIntegrityFileManager;
-    private final FileIntegrityManager mFileIntegrityManager;
 
     /** Create an instance of {@link AppIntegrityManagerServiceImpl}. */
     public static AppIntegrityManagerServiceImpl create(Context context) {
@@ -134,7 +132,6 @@ public class AppIntegrityManagerServiceImpl extends IAppIntegrityManager.Stub {
                 LocalServices.getService(PackageManagerInternal.class),
                 RuleEvaluationEngine.getRuleEvaluationEngine(),
                 IntegrityFileManager.getInstance(),
-                (FileIntegrityManager) context.getSystemService(Context.FILE_INTEGRITY_SERVICE),
                 handlerThread.getThreadHandler());
     }
 
@@ -144,13 +141,11 @@ public class AppIntegrityManagerServiceImpl extends IAppIntegrityManager.Stub {
             PackageManagerInternal packageManagerInternal,
             RuleEvaluationEngine evaluationEngine,
             IntegrityFileManager integrityFileManager,
-            FileIntegrityManager fileIntegrityManager,
             Handler handler) {
         mContext = context;
         mPackageManagerInternal = packageManagerInternal;
         mEvaluationEngine = evaluationEngine;
         mIntegrityFileManager = integrityFileManager;
-        mFileIntegrityManager = fileIntegrityManager;
         mHandler = handler;
 
         IntentFilter integrityVerificationFilter = new IntentFilter();
@@ -476,6 +471,8 @@ public class AppIntegrityManagerServiceImpl extends IAppIntegrityManager.Stub {
                 SourceStampVerifier.verify(installationPath.getAbsolutePath());
         appInstallMetadata.setIsStampPresent(sourceStampVerificationResult.isPresent());
         appInstallMetadata.setIsStampVerified(sourceStampVerificationResult.isVerified());
+        // A verified stamp is set to be trusted.
+        appInstallMetadata.setIsStampTrusted(sourceStampVerificationResult.isVerified());
         if (sourceStampVerificationResult.isVerified()) {
             X509Certificate sourceStampCertificate =
                     (X509Certificate) sourceStampVerificationResult.getCertificate();
@@ -488,16 +485,6 @@ public class AppIntegrityManagerServiceImpl extends IAppIntegrityManager.Stub {
                 throw new IllegalArgumentException(
                         "Error computing source stamp certificate digest", e);
             }
-            // Checks if the source stamp certificate is trusted.
-            try {
-                appInstallMetadata.setIsStampTrusted(
-                        mFileIntegrityManager.isApkVeritySupported()
-                                && mFileIntegrityManager.isAppSourceCertificateTrusted(
-                                        sourceStampCertificate));
-            } catch (CertificateEncodingException e) {
-                throw new IllegalArgumentException(
-                        "Error checking if source stamp certificate is trusted", e);
-            }
         }
     }
 

services/tests/servicestests/src/com/android/server/integrity/AppIntegrityManagerServiceImplTest.java

@@ -62,7 +62,6 @@ import android.net.Uri;
 import android.os.Handler;
 import android.os.Message;
 import android.provider.Settings;
-import android.security.FileIntegrityManager;
 
 import androidx.test.InstrumentationRegistry;
 
@@ -136,7 +135,6 @@ public class AppIntegrityManagerServiceImplTest {
     @Mock RuleEvaluationEngine mRuleEvaluationEngine;
     @Mock IntegrityFileManager mIntegrityFileManager;
     @Mock Handler mHandler;
-    FileIntegrityManager mFileIntegrityManager;
 
     private final Context mRealContext = InstrumentationRegistry.getTargetContext();
 
@@ -165,16 +163,12 @@ public class AppIntegrityManagerServiceImplTest {
             Files.copy(inputStream, mTestApkSourceStamp.toPath(), REPLACE_EXISTING);
         }
 
-        mFileIntegrityManager =
-                (FileIntegrityManager)
-                        mRealContext.getSystemService(Context.FILE_INTEGRITY_SERVICE);
         mService =
                 new AppIntegrityManagerServiceImpl(
                         mMockContext,
                         mPackageManagerInternal,
                         mRuleEvaluationEngine,
                         mIntegrityFileManager,
-                        mFileIntegrityManager,
                         mHandler);
 
         mSpyPackageManager = spy(mRealContext.getPackageManager());
@@ -379,7 +373,7 @@ public class AppIntegrityManagerServiceImplTest {
         AppInstallMetadata appInstallMetadata = metadataCaptor.getValue();
         assertTrue(appInstallMetadata.isStampPresent());
         assertTrue(appInstallMetadata.isStampVerified());
-        assertFalse(appInstallMetadata.isStampTrusted());
+        assertTrue(appInstallMetadata.isStampTrusted());
         assertEquals(SOURCE_STAMP_CERTIFICATE_HASH, appInstallMetadata.getStampCertificateHash());
     }