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/*
* Copyright (C) 2015 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;
import android.os.Looper;
import com.android.internal.widget.LockPatternUtils;
import com.android.internal.widget.LockPatternUtils.StrongAuthTracker;
import android.app.trust.IStrongAuthTracker;
import android.os.DeadObjectException;
import android.os.Handler;
import android.os.Message;
import android.os.RemoteException;
import android.os.UserHandle;
import android.util.Slog;
import android.util.SparseIntArray;
import java.util.ArrayList;
import static com.android.internal.widget.LockPatternUtils.StrongAuthTracker.STRONG_AUTH_NOT_REQUIRED;
/**
* Keeps track of requests for strong authentication.
*/
public class LockSettingsStrongAuth {
private static final String TAG = "LockSettings";
private static final int MSG_REQUIRE_STRONG_AUTH = 1;
private static final int MSG_REGISTER_TRACKER = 2;
private static final int MSG_UNREGISTER_TRACKER = 3;
private static final int MSG_REMOVE_USER = 4;
private final ArrayList<IStrongAuthTracker> mStrongAuthTrackers = new ArrayList<>();
private final SparseIntArray mStrongAuthForUser = new SparseIntArray();
private final Handler mHandler;
public LockSettingsStrongAuth() {
mHandler = new Handler(Looper.getMainLooper(), mHandlerCallback);
}
private void handleAddStrongAuthTracker(IStrongAuthTracker tracker) {
for (int i = 0; i < mStrongAuthTrackers.size(); i++) {
if (mStrongAuthTrackers.get(i).asBinder() == tracker.asBinder()) {
return;
}
}
mStrongAuthTrackers.add(tracker);
for (int i = 0; i < mStrongAuthForUser.size(); i++) {
int key = mStrongAuthForUser.keyAt(i);
int value = mStrongAuthForUser.valueAt(i);
try {
tracker.onStrongAuthRequiredChanged(value, key);
} catch (RemoteException e) {
Slog.e(TAG, "Exception while adding StrongAuthTracker.", e);
}
}
}
private void handleRemoveStrongAuthTracker(IStrongAuthTracker tracker) {
for (int i = 0; i < mStrongAuthTrackers.size(); i++) {
if (mStrongAuthTrackers.get(i).asBinder() == tracker.asBinder()) {
mStrongAuthTrackers.remove(i);
return;
}
}
}
private void handleRequireStrongAuth(int strongAuthReason, int userId) {
if (userId == UserHandle.USER_ALL) {
for (int i = 0; i < mStrongAuthForUser.size(); i++) {
int key = mStrongAuthForUser.keyAt(i);
handleRequireStrongAuthOneUser(strongAuthReason, key);
}
} else {
handleRequireStrongAuthOneUser(strongAuthReason, userId);
}
}
private void handleRequireStrongAuthOneUser(int strongAuthReason, int userId) {
int oldValue = mStrongAuthForUser.get(userId, LockPatternUtils.StrongAuthTracker.DEFAULT);
int newValue = strongAuthReason == STRONG_AUTH_NOT_REQUIRED
? STRONG_AUTH_NOT_REQUIRED
: (oldValue | strongAuthReason);
if (oldValue != newValue) {
mStrongAuthForUser.put(userId, newValue);
notifyStrongAuthTrackers(newValue, userId);
}
}
private void handleRemoveUser(int userId) {
int index = mStrongAuthForUser.indexOfKey(userId);
if (index >= 0) {
mStrongAuthForUser.removeAt(index);
notifyStrongAuthTrackers(StrongAuthTracker.DEFAULT, userId);
}
}
private void notifyStrongAuthTrackers(int strongAuthReason, int userId) {
for (int i = 0; i < mStrongAuthTrackers.size(); i++) {
try {
mStrongAuthTrackers.get(i).onStrongAuthRequiredChanged(strongAuthReason, userId);
} catch (DeadObjectException e) {
Slog.d(TAG, "Removing dead StrongAuthTracker.");
mStrongAuthTrackers.remove(i);
i--;
} catch (RemoteException e) {
Slog.e(TAG, "Exception while notifying StrongAuthTracker.", e);
}
}
}
public void registerStrongAuthTracker(IStrongAuthTracker tracker) {
mHandler.obtainMessage(MSG_REGISTER_TRACKER, tracker).sendToTarget();
}
public void unregisterStrongAuthTracker(IStrongAuthTracker tracker) {
mHandler.obtainMessage(MSG_UNREGISTER_TRACKER, tracker).sendToTarget();
}
public void removeUser(int userId) {
mHandler.obtainMessage(MSG_REMOVE_USER, userId, 0).sendToTarget();
}
public void requireStrongAuth(int strongAuthReason, int userId) {
if (userId == UserHandle.USER_ALL || userId >= UserHandle.USER_OWNER) {
mHandler.obtainMessage(MSG_REQUIRE_STRONG_AUTH, strongAuthReason,
userId).sendToTarget();
} else {
throw new IllegalArgumentException(
"userId must be an explicit user id or USER_ALL");
}
}
public void reportUnlock(int userId) {
requireStrongAuth(STRONG_AUTH_NOT_REQUIRED, userId);
}
private final Handler.Callback mHandlerCallback = new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
switch (msg.what) {
case MSG_REGISTER_TRACKER:
handleAddStrongAuthTracker((IStrongAuthTracker) msg.obj);
break;
case MSG_UNREGISTER_TRACKER:
handleRemoveStrongAuthTracker((IStrongAuthTracker) msg.obj);
break;
case MSG_REQUIRE_STRONG_AUTH:
handleRequireStrongAuth(msg.arg1, msg.arg2);
break;
case MSG_REMOVE_USER:
handleRemoveUser(msg.arg1);
break;
}
return true;
}
};
}
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