Tell keystore which SIDs can unlock this user

If biometric unlock is enabled, we tell keystore at lock time so that
a key can be set up in KM which unlocks UNLOCKED_DEVICE_REQUIRED keys
based on auth tokens carrying those SIDs. This also has the effect that
if there is no biometric unlock, UNLOCKED_DEVICE_REQUIRED keys have
full cryptographic protection, per NIAP requirements.

Test: aosp/1686345
Bug: 163866361
Change-Id: Ia4d01faa998c76b2b33ad3520730466ac59e6d8d

keystore/java/android/security/Authorization.java

@@ -74,16 +74,19 @@ public class Authorization {
      * @param locked            - whether it is a lock (true) or unlock (false) event
      * @param syntheticPassword - if it is an unlock event with the password, pass the synthetic
      *                            password provided by the LockSettingService
+     * @param unlockingSids     - KeyMint secure user IDs that should be permitted to unlock
+     *                            UNLOCKED_DEVICE_REQUIRED keys.
      *
      * @return 0 if successful or a {@code ResponseCode}.
      */
     public static int onLockScreenEvent(@NonNull boolean locked, @NonNull int userId,
-            @Nullable byte[] syntheticPassword) {
+            @Nullable byte[] syntheticPassword, @Nullable long[] unlockingSids) {
         try {
             if (locked) {
-                getService().onLockScreenEvent(LockScreenEvent.LOCK, userId, null);
+                getService().onLockScreenEvent(LockScreenEvent.LOCK, userId, null, unlockingSids);
             } else {
-                getService().onLockScreenEvent(LockScreenEvent.UNLOCK, userId, syntheticPassword);
+                getService().onLockScreenEvent(
+                        LockScreenEvent.UNLOCK, userId, syntheticPassword, unlockingSids);
             }
             return 0;
         } catch (RemoteException | NullPointerException e) {

services/core/java/com/android/server/locksettings/LockSettingsService.java

@@ -1266,7 +1266,7 @@ public class LockSettingsService extends ILockSettings.Stub {
 
     private void unlockKeystore(byte[] password, int userHandle) {
         if (DEBUG) Slog.v(TAG, "Unlock keystore for user: " + userHandle);
-        Authorization.onLockScreenEvent(false, userHandle, password);
+        Authorization.onLockScreenEvent(false, userHandle, password, null);
     }
 
     @VisibleForTesting /** Note: this method is overridden in unit tests */

services/core/java/com/android/server/trust/TrustManagerService.java

@@ -39,6 +39,7 @@ import android.content.res.TypedArray;
 import android.content.res.XmlResourceParser;
 import android.database.ContentObserver;
 import android.graphics.drawable.Drawable;
+import android.hardware.biometrics.BiometricManager;
 import android.hardware.biometrics.BiometricSourceType;
 import android.net.Uri;
 import android.os.Binder;
@@ -185,8 +186,6 @@ public class TrustManagerService extends SystemService {
     private boolean mTrustAgentsCanRun = false;
     private int mCurrentUser = UserHandle.USER_SYSTEM;
 
-    private Authorization mAuthorizationService;
-
     public TrustManagerService(Context context) {
         super(context);
         mContext = context;
@@ -196,7 +195,6 @@ public class TrustManagerService extends SystemService {
         mStrongAuthTracker = new StrongAuthTracker(context);
         mAlarmManager = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
         mSettingsObserver = new SettingsObserver(mHandler);
-        mAuthorizationService = new Authorization();
     }
 
     @Override
@@ -698,13 +696,14 @@ public class TrustManagerService extends SystemService {
         }
         if (changed) {
             dispatchDeviceLocked(userId, locked);
-
-            Authorization.onLockScreenEvent(locked, userId, null);
+            Authorization.onLockScreenEvent(locked, userId, null,
+                    getBiometricSids(userId));
             // Also update the user's profiles who have unified challenge, since they
             // share the same unlocked state (see {@link #isDeviceLocked(int)})
             for (int profileHandle : mUserManager.getEnabledProfileIds(userId)) {
                 if (mLockPatternUtils.isManagedProfileWithUnifiedChallenge(profileHandle)) {
-                    mAuthorizationService.onLockScreenEvent(locked, profileHandle, null);
+                    Authorization.onLockScreenEvent(locked, profileHandle, null,
+                            getBiometricSids(profileHandle));
                 }
             }
         }
@@ -1044,6 +1043,14 @@ public class TrustManagerService extends SystemService {
         }
     }
 
+    private long[] getBiometricSids(int userId) {
+        BiometricManager biometricManager = mContext.getSystemService(BiometricManager.class);
+        if (biometricManager == null) {
+            return null;
+        }
+        return biometricManager.getAuthenticatorIds(userId);
+    }
+
     // User lifecycle
 
     @Override
@@ -1255,7 +1262,8 @@ public class TrustManagerService extends SystemService {
                         mDeviceLockedForUser.put(userId, locked);
                     }
 
-                    Authorization.onLockScreenEvent(locked, userId, null);
+                    Authorization.onLockScreenEvent(locked, userId, null,
+                            getBiometricSids(userId));
 
                     if (locked) {
                         try {