3 files changed, 71 insertions, 3 deletions
diff --git a/keystore/java/android/security/AndroidKeyStoreMaintenance.java b/keystore/java/android/security/AndroidKeyStoreMaintenance.java
index c81c8c54d88a..ed789f03f9ba 100644
--- a/keystore/java/android/security/AndroidKeyStoreMaintenance.java
+++ b/keystore/java/android/security/AndroidKeyStoreMaintenance.java
@@ -21,6 +21,7 @@ import android.annotation.Nullable;
 import android.os.ServiceManager;
 import android.os.ServiceSpecificException;
 import android.security.usermanager.IKeystoreUserManager;
+import android.system.keystore2.Domain;
 import android.system.keystore2.ResponseCode;
 import android.util.Log;
 
@@ -39,7 +40,7 @@ public class AndroidKeyStoreMaintenance {
     }
 
     /**
-     * Informs keystore2 about adding a user
+     * Informs Keystore 2.0 about adding a user
      *
      * @param userId - Android user id of the user being added
      * @return 0 if successful or a {@code ResponseCode}
@@ -60,7 +61,7 @@ public class AndroidKeyStoreMaintenance {
     }
 
     /**
-     * Informs keystore2 about removing a usergit mer
+     * Informs Keystore 2.0 about removing a usergit mer
      *
      * @param userId - Android user id of the user being removed
      * @return 0 if successful or a {@code ResponseCode}
@@ -81,7 +82,7 @@ public class AndroidKeyStoreMaintenance {
     }
 
     /**
-     * Informs keystore2 about changing user's password
+     * Informs Keystore 2.0 about changing user's password
      *
      * @param userId   - Android user id of the user
      * @param password - a secret derived from the synthetic password provided by the
@@ -102,4 +103,22 @@ public class AndroidKeyStoreMaintenance {
             return SYSTEM_ERROR;
         }
     }
+
+    /**
+     * Informs Keystore 2.0 that an app was uninstalled and the corresponding namspace is to
+     * be cleared.
+     */
+    public static int clearNamespace(@Domain int domain, long namespace) {
+        if (!android.security.keystore2.AndroidKeyStoreProvider.isInstalled()) return 0;
+        try {
+            getService().clearNamespace(domain, namespace);
+            return 0;
+        } catch (ServiceSpecificException e) {
+            Log.e(TAG, "clearNamespace failed", e);
+            return e.errorCode;
+        } catch (Exception e) {
+            Log.e(TAG, "Can not connect to keystore", e);
+            return SYSTEM_ERROR;
+        }
+    }
 }
diff --git a/keystore/java/android/security/KeyStore.java b/keystore/java/android/security/KeyStore.java
index 198df40c7d7b..93658e69eac8 100644
--- a/keystore/java/android/security/KeyStore.java
+++ b/keystore/java/android/security/KeyStore.java
@@ -43,6 +43,7 @@ import android.security.keystore.KeyPermanentlyInvalidatedException;
 import android.security.keystore.KeyProperties;
 import android.security.keystore.KeystoreResponse;
 import android.security.keystore.UserNotAuthenticatedException;
+import android.system.keystore2.Domain;
 import android.util.Log;
 
 import com.android.internal.org.bouncycastle.asn1.ASN1InputStream;
@@ -466,6 +467,9 @@ public class KeyStore {
 
     public boolean clearUid(int uid) {
         try {
+            if (android.security.keystore2.AndroidKeyStoreProvider.isInstalled()) {
+                return AndroidKeyStoreMaintenance.clearNamespace(Domain.APP, uid) == 0;
+            }
             return mBinder.clear_uid(uid) == NO_ERROR;
         } catch (RemoteException e) {
             Log.w(TAG, "Cannot connect to keystore", e);
diff --git a/keystore/java/android/security/KeyStore2.java b/keystore/java/android/security/KeyStore2.java
index 476e4d7b7b18..6ac3821d0f9c 100644
--- a/keystore/java/android/security/KeyStore2.java
+++ b/keystore/java/android/security/KeyStore2.java
@@ -24,6 +24,7 @@ import android.os.RemoteException;
 import android.os.ServiceManager;
 import android.os.ServiceSpecificException;
 import android.security.keymaster.KeymasterDefs;
+import android.system.keystore2.Domain;
 import android.system.keystore2.IKeystoreService;
 import android.system.keystore2.KeyDescriptor;
 import android.system.keystore2.KeyEntryResponse;
@@ -157,6 +158,50 @@ public class KeyStore2 {
     }
 
     /**
+     * Grant string prefix as used by the keystore boringssl engine. Must be kept in sync
+     * with system/security/keystore-engine. Note: The prefix here includes the 0x which
+     * std::stringstream used in keystore-engine needs to identify the number as hex represented.
+     * Here we include it in the prefix, because Long#parseUnsignedLong does not understand it
+     * and gets the radix as explicit argument.
+     * @hide
+     */
+    private static final String KEYSTORE_ENGINE_GRANT_ALIAS_PREFIX =
+            "ks2_keystore-engine_grant_id:0x";
+
+    /**
+     * This function turns a grant identifier into a specific string that is understood by the
+     * keystore-engine in system/security/keystore-engine. Is only used by VPN and WI-FI components
+     * to allow certain system components like racoon or vendor components like WPA supplicant
+     * to use keystore keys with boring ssl.
+     *
+     * @param grantId the grant id as returned by {@link #grant} in the {@code nspace} filed of
+     *                the resulting {@code KeyDescriptor}.
+     * @return The grant descriptor string.
+     * @hide
+     */
+    public static String makeKeystoreEngineGrantString(long grantId) {
+        return String.format("%s%016X", KEYSTORE_ENGINE_GRANT_ALIAS_PREFIX, grantId);
+    }
+
+    /**
+     * Convenience function to turn a keystore engine grant string as returned by
+     * {@link #makeKeystoreEngineGrantString(long)} back into a grant KeyDescriptor.
+     *
+     * @param grantString As string returned by {@link #makeKeystoreEngineGrantString(long)}
+     * @return The grant key descriptor.
+     * @hide
+     */
+    public static KeyDescriptor keystoreEngineGrantString2KeyDescriptor(String grantString) {
+        KeyDescriptor key = new KeyDescriptor();
+        key.domain = Domain.GRANT;
+        key.nspace = Long.parseUnsignedLong(
+                grantString.substring(KEYSTORE_ENGINE_GRANT_ALIAS_PREFIX.length()), 16);
+        key.alias = null;
+        key.blob = null;
+        return key;
+    }
+
+    /**
      * Create a grant that allows the grantee identified by {@code granteeUid} to use
      * the key specified by {@code descriptor} withint the restrictions given by
      * {@code accessVectore}.