| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| |
| package com.android.server.security; |
| |
| import android.content.Context; |
| import android.content.pm.PackageInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.PackageManager.NameNotFoundException; |
| import android.os.Binder; |
| import android.os.RemoteException; |
| import android.os.UserHandle; |
| import android.security.keymaster.IKeyAttestationApplicationIdProvider; |
| import android.security.keymaster.KeyAttestationApplicationId; |
| import android.security.keymaster.KeyAttestationPackageInfo; |
| |
| /** |
| * @hide |
| * The KeyAttestationApplicationIdProviderService provides information describing the possible |
| * applications identified by a UID. Due to UID sharing, this KeyAttestationApplicationId can |
| * comprise information about multiple packages. The Information is used by keystore and credstore |
| * to describe the initiating application of a key attestation procedure. |
| */ |
| public class KeyAttestationApplicationIdProviderService |
| extends IKeyAttestationApplicationIdProvider.Stub { |
| |
| public KeyAttestationApplicationIdProviderService(Context context) { |
| mPackageManager = context.getPackageManager(); |
| } |
| |
| private PackageManager mPackageManager; |
| |
| public KeyAttestationApplicationId getKeyAttestationApplicationId(int uid) |
| throws RemoteException { |
| int callingUid = Binder.getCallingUid(); |
| if (callingUid != android.os.Process.KEYSTORE_UID |
| && callingUid != android.os.Process.CREDSTORE_UID) { |
| throw new SecurityException("This service can only be used by Keystore or Credstore"); |
| } |
| KeyAttestationPackageInfo[] keyAttestationPackageInfos = null; |
| final long token = Binder.clearCallingIdentity(); |
| try { |
| String[] packageNames = mPackageManager.getPackagesForUid(uid); |
| if (packageNames == null) { |
| throw new RemoteException("No packages for uid"); |
| } |
| int userId = UserHandle.getUserId(uid); |
| keyAttestationPackageInfos = new KeyAttestationPackageInfo[packageNames.length]; |
| |
| for (int i = 0; i < packageNames.length; ++i) { |
| PackageInfo packageInfo = mPackageManager.getPackageInfoAsUser(packageNames[i], |
| PackageManager.GET_SIGNATURES, userId); |
| keyAttestationPackageInfos[i] = new KeyAttestationPackageInfo(packageNames[i], |
| packageInfo.getLongVersionCode(), packageInfo.signatures); |
| } |
| } catch (NameNotFoundException nnfe) { |
| throw new RemoteException(nnfe.getMessage()); |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| return new KeyAttestationApplicationId(keyAttestationPackageInfos); |
| } |
| } |