Fix keyguard checking when installing user certs.

Currently the condition is inverted, so the user is asked to enroll
a password only when there is one already.

Also, use existing method instead of a duplicate one. LPU.isSecure doesn't
check the credential owner, but for unified lock with empty parent password
it will correctly return false, so should be correct.

Bug: 113646620
Test: manual, tried installing user certs with and without screen lock.
Change-Id: Iabb1614540e454873e48039be13e22cc89b0a7be

src/com/android/settings/CredentialStorage.java

@@ -106,12 +106,19 @@ public final class CredentialStorage extends FragmentActivity {
     private static final int CONFIRM_CLEAR_SYSTEM_CREDENTIAL_REQUEST = 2;
 
     private final KeyStore mKeyStore = KeyStore.getInstance();
+    private LockPatternUtils mUtils;
 
     /**
      * When non-null, the bundle containing credentials to install.
      */
     private Bundle mInstallBundle;
 
+    @Override
+    protected void onCreate(Bundle savedState) {
+        super.onCreate(savedState);
+        mUtils = new LockPatternUtils(this);
+    }
+
     @Override
     protected void onResume() {
         super.onResume();
@@ -160,7 +167,7 @@ public final class CredentialStorage extends FragmentActivity {
                 return;
             }
             case UNLOCKED: {
-                if (isActivePasswordQualityInsufficient()) {
+                if (!mUtils.isSecure(UserHandle.myUserId())) {
                     final ConfigureKeyGuardDialog dialog = new ConfigureKeyGuardDialog();
                     dialog.show(getSupportFragmentManager(), ConfigureKeyGuardDialog.TAG);
                     return;
@@ -179,7 +186,7 @@ public final class CredentialStorage extends FragmentActivity {
      * case after unlocking with an old-style password).
      */
     private void ensureKeyGuard() {
-        if (isActivePasswordQualityInsufficient()) {
+        if (!mUtils.isSecure(UserHandle.myUserId())) {
             // key guard not setup, doing so will initialize keystore
             final ConfigureKeyGuardDialog dialog = new ConfigureKeyGuardDialog();
             dialog.show(getSupportFragmentManager(), ConfigureKeyGuardDialog.TAG);
@@ -194,16 +201,6 @@ public final class CredentialStorage extends FragmentActivity {
         finish();
     }
 
-    /**
-     * Returns true if the currently set key guard violates our minimum quality requirements.
-     */
-    private boolean isActivePasswordQualityInsufficient() {
-        final int credentialOwner =
-                UserManager.get(this).getCredentialOwnerProfile(UserHandle.myUserId());
-        final int quality = new LockPatternUtils(this).getActivePasswordQuality(credentialOwner);
-        return (quality >= MIN_PASSWORD_QUALITY);
-    }
-
     private boolean isHardwareBackedKey(byte[] keyData) {
         try {
             final ASN1InputStream bIn = new ASN1InputStream(new ByteArrayInputStream(keyData));
@@ -350,7 +347,7 @@ public final class CredentialStorage extends FragmentActivity {
         protected Boolean doInBackground(Void... unused) {
 
             // Clear all the users credentials could have been installed in for this user.
-            new LockPatternUtils(CredentialStorage.this).resetKeyStore(UserHandle.myUserId());
+            mUtils.resetKeyStore(UserHandle.myUserId());
 
             try {
                 final KeyChainConnection keyChainConnection = KeyChain.bind(CredentialStorage.this);