TrustManager.java revision 56878a93989a49538fabccfb7218face645030bf 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License
15 */
16
17package android.app.trust;
18
19import android.annotation.IntDef;
20import android.os.Handler;
21import android.os.IBinder;
22import android.os.Looper;
23import android.os.Message;
24import android.os.RemoteException;
25import android.os.UserHandle;
26import android.util.ArrayMap;
27import android.util.Log;
28import android.util.SparseIntArray;
29
30import java.lang.annotation.Retention;
31import java.lang.annotation.RetentionPolicy;
32
33/**
34 * See {@link com.android.server.trust.TrustManagerService}
35 * @hide
36 */
37public class TrustManager {
38
39    private static final int MSG_TRUST_CHANGED = 1;
40    private static final int MSG_TRUST_MANAGED_CHANGED = 2;
41
42    private static final String TAG = "TrustManager";
43    private static final String DATA_FLAGS = "initiatedByUser";
44
45    private final ITrustManager mService;
46    private final ArrayMap<TrustListener, ITrustListener> mTrustListeners;
47
48    public TrustManager(IBinder b) {
49        mService = ITrustManager.Stub.asInterface(b);
50        mTrustListeners = new ArrayMap<TrustListener, ITrustListener>();
51    }
52
53    /**
54     * Changes the lock status for the given user. This is only applicable to Managed Profiles,
55     * other users should be handled by Keyguard.
56     *
57     * @param userId The id for the user to be locked/unlocked.
58     * @param locked The value for that user's locked state.
59     */
60    public void setDeviceLockedForUser(int userId, boolean locked) {
61        try {
62            mService.setDeviceLockedForUser(userId, locked);
63        } catch (RemoteException e) {
64            onError(e);
65        }
66    }
67
68    /**
69     * Reports that user {@param userId} has tried to unlock the device.
70     *
71     * @param successful if true, the unlock attempt was successful.
72     *
73     * Requires the {@link android.Manifest.permission#ACCESS_KEYGUARD_SECURE_STORAGE} permission.
74     */
75    public void reportUnlockAttempt(boolean successful, int userId) {
76        try {
77            mService.reportUnlockAttempt(successful, userId);
78        } catch (RemoteException e) {
79            onError(e);
80        }
81    }
82
83    /**
84     * Reports that the list of enabled trust agents changed for user {@param userId}.
85     *
86     * Requires the {@link android.Manifest.permission#ACCESS_KEYGUARD_SECURE_STORAGE} permission.
87     */
88    public void reportEnabledTrustAgentsChanged(int userId) {
89        try {
90            mService.reportEnabledTrustAgentsChanged(userId);
91        } catch (RemoteException e) {
92            onError(e);
93        }
94    }
95
96    /**
97     * Reports that the visibility of the keyguard has changed.
98     *
99     * Requires the {@link android.Manifest.permission#ACCESS_KEYGUARD_SECURE_STORAGE} permission.
100     */
101    public void reportKeyguardShowingChanged() {
102        try {
103            mService.reportKeyguardShowingChanged();
104        } catch (RemoteException e) {
105            onError(e);
106        }
107    }
108
109    /**
110     * Registers a listener for trust events.
111     *
112     * Requires the {@link android.Manifest.permission#TRUST_LISTENER} permission.
113     */
114    public void registerTrustListener(final TrustListener trustListener) {
115        try {
116            ITrustListener.Stub iTrustListener = new ITrustListener.Stub() {
117                @Override
118                public void onTrustChanged(boolean enabled, int userId, int flags) {
119                    Message m = mHandler.obtainMessage(MSG_TRUST_CHANGED, (enabled ? 1 : 0), userId,
120                            trustListener);
121                    if (flags != 0) {
122                        m.getData().putInt(DATA_FLAGS, flags);
123                    }
124                    m.sendToTarget();
125                }
126
127                @Override
128                public void onTrustManagedChanged(boolean managed, int userId) {
129                    mHandler.obtainMessage(MSG_TRUST_MANAGED_CHANGED, (managed ? 1 : 0), userId,
130                            trustListener).sendToTarget();
131                }
132            };
133            mService.registerTrustListener(iTrustListener);
134            mTrustListeners.put(trustListener, iTrustListener);
135        } catch (RemoteException e) {
136            onError(e);
137        }
138    }
139
140    /**
141     * Unregisters a listener for trust events.
142     *
143     * Requires the {@link android.Manifest.permission#TRUST_LISTENER} permission.
144     */
145    public void unregisterTrustListener(final TrustListener trustListener) {
146        ITrustListener iTrustListener = mTrustListeners.remove(trustListener);
147        if (iTrustListener != null) {
148            try {
149                mService.unregisterTrustListener(iTrustListener);
150            } catch (RemoteException e) {
151                onError(e);
152            }
153        }
154    }
155
156    private void onError(Exception e) {
157        Log.e(TAG, "Error while calling TrustManagerService", e);
158    }
159
160    private final Handler mHandler = new Handler(Looper.getMainLooper()) {
161        @Override
162        public void handleMessage(Message msg) {
163            switch(msg.what) {
164                case MSG_TRUST_CHANGED:
165                    int flags = msg.peekData() != null ? msg.peekData().getInt(DATA_FLAGS) : 0;
166                    ((TrustListener)msg.obj).onTrustChanged(msg.arg1 != 0, msg.arg2, flags);
167                    break;
168                case MSG_TRUST_MANAGED_CHANGED:
169                    ((TrustListener)msg.obj).onTrustManagedChanged(msg.arg1 != 0, msg.arg2);
170            }
171        }
172    };
173
174    public interface TrustListener {
175
176        /**
177         * Reports that the trust state has changed.
178         * @param enabled if true, the system believes the environment to be trusted.
179         * @param userId the user, for which the trust changed.
180         * @param flags flags specified by the trust agent when granting trust. See
181         *     {@link android.service.trust.TrustAgentService#grantTrust(CharSequence, long, int)
182         *                 TrustAgentService.grantTrust(CharSequence, long, int)}.
183         */
184        void onTrustChanged(boolean enabled, int userId, int flags);
185
186        /**
187         * Reports that whether trust is managed has changed
188         * @param enabled if true, at least one trust agent is managing trust.
189         * @param userId the user, for which the state changed.
190         */
191        void onTrustManagedChanged(boolean enabled, int userId);
192    }
193}
194