private static final String RESTRICTIONS_FILE_PREFIX = "res_";
private static final String XML_SUFFIX = ".xml";
+ private static final int ALLOWED_FLAGS_FOR_CREATE_USERS_PERMISSION =
+ UserInfo.FLAG_MANAGED_PROFILE
+ | UserInfo.FLAG_RESTRICTED
+ | UserInfo.FLAG_GUEST;
+
private static final int MIN_USER_ID = 10;
private static final int USER_VERSION = 5;
@Override
public List<UserInfo> getUsers(boolean excludeDying) {
- checkManageUsersPermission("query users");
+ checkManageOrCreateUsersPermission("query users");
synchronized (mPackagesLock) {
ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size());
for (int i = 0; i < mUsers.size(); i++) {
@Override
public UserInfo getUserInfo(int userId) {
- checkManageUsersPermission("query user");
+ checkManageOrCreateUsersPermission("query user");
synchronized (mPackagesLock) {
return getUserInfoLocked(userId);
}
}
}
+ /**
+ * Enforces that only the system UID or root's UID or apps that have the
+ * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} or
+ * {@link android.Manifest.permission#CREATE_USERS CREATE_USERS}
+ * can make certain calls to the UserManager.
+ *
+ * @param message used as message if SecurityException is thrown
+ * @throws SecurityException if the caller is not system or root
+ * @see #hasManageOrCreateUsersPermission()
+ */
+ private static final void checkManageOrCreateUsersPermission(String message) {
+ if (!hasManageOrCreateUsersPermission()) {
+ throw new SecurityException(
+ "You either need MANAGE_USERS or CREATE_USERS permission to: " + message);
+ }
+ }
+
+ /**
+ * Similar to {@link #checkManageOrCreateUsersPermission(String)} but when the caller is tries
+ * to create user/profiles other than what is allowed for
+ * {@link android.Manifest.permission#CREATE_USERS CREATE_USERS} permission, then it will only
+ * allow callers with {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} permission.
+ */
+ private static final void checkManageOrCreateUsersPermission(int creationFlags) {
+ if ((creationFlags & ~ALLOWED_FLAGS_FOR_CREATE_USERS_PERMISSION) == 0) {
+ if (!hasManageOrCreateUsersPermission()) {
+ throw new SecurityException("You either need MANAGE_USERS or CREATE_USERS "
+ + "permission to create an user with flags: " + creationFlags);
+ }
+ } else if (!hasManageUsersPermission()) {
+ throw new SecurityException("You need MANAGE_USERS permission to create an user "
+ + " with flags: " + creationFlags);
+ }
+ }
+
+ /**
+ * @return whether the calling UID is system UID or root's UID or the calling app has the
+ * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS}.
+ */
+ private static final boolean hasManageUsersPermission() {
+ final int callingUid = Binder.getCallingUid();
+ return UserHandle.isSameApp(callingUid, Process.SYSTEM_UID)
+ || callingUid == Process.ROOT_UID
+ || ActivityManager.checkComponentPermission(
+ android.Manifest.permission.MANAGE_USERS,
+ callingUid, -1, true) == PackageManager.PERMISSION_GRANTED;
+ }
+
+ /**
+ * @return whether the calling UID is system UID or root's UID or the calling app has the
+ * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} or
+ * {@link android.Manifest.permission#CREATE_USERS CREATE_USERS}.
+ */
+ private static final boolean hasManageOrCreateUsersPermission() {
+ final int callingUid = Binder.getCallingUid();
+ return UserHandle.isSameApp(callingUid, Process.SYSTEM_UID)
+ || callingUid == Process.ROOT_UID
+ || ActivityManager.checkComponentPermission(
+ android.Manifest.permission.MANAGE_USERS,
+ callingUid, -1, true) == PackageManager.PERMISSION_GRANTED
+ || ActivityManager.checkComponentPermission(
+ android.Manifest.permission.CREATE_USERS,
+ callingUid, -1, true) == PackageManager.PERMISSION_GRANTED;
+ }
+
private void writeBitmapLocked(UserInfo info, Bitmap bitmap) {
try {
File dir = new File(mUsersDir, Integer.toString(info.id));
@Override
public UserInfo createProfileForUser(String name, int flags, int userId) {
- checkManageUsersPermission("Only the system can create users");
+ checkManageOrCreateUsersPermission(flags);
if (userId != UserHandle.USER_OWNER) {
Slog.w(LOG_TAG, "Only user owner can have profiles");
return null;
@Override
public UserInfo createUser(String name, int flags) {
- checkManageUsersPermission("Only the system can create users");
+ checkManageOrCreateUsersPermission(flags);
return createUserInternal(name, flags, UserHandle.USER_NULL);
}
* @param userHandle the user's id
*/
public boolean removeUser(int userHandle) {
- checkManageUsersPermission("Only the system can remove users");
+ checkManageOrCreateUsersPermission("Only the system can remove users");
if (getUserRestrictions(UserHandle.getCallingUserId()).getBoolean(
UserManager.DISALLOW_REMOVE_USER, false)) {
Log.w(LOG_TAG, "Cannot remove user. DISALLOW_REMOVE_USER is enabled.");