1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
|
/*
* Copyright (C) 2008 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.clipboard;
import android.app.ActivityManagerNative;
import android.app.AppGlobals;
import android.app.AppOpsManager;
import android.app.IActivityManager;
import android.content.BroadcastReceiver;
import android.content.ClipData;
import android.content.ClipDescription;
import android.content.IClipboard;
import android.content.IOnPrimaryClipChangedListener;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.IPackageManager;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Binder;
import android.os.IBinder;
import android.os.Parcel;
import android.os.Process;
import android.os.RemoteCallbackList;
import android.os.RemoteException;
import android.os.UserHandle;
import android.util.Pair;
import android.util.Slog;
import android.util.SparseArray;
import java.util.HashSet;
/**
* Implementation of the clipboard for copy and paste.
*/
public class ClipboardService extends IClipboard.Stub {
private static final String TAG = "ClipboardService";
private final Context mContext;
private final IActivityManager mAm;
private final PackageManager mPm;
private final AppOpsManager mAppOps;
private final IBinder mPermissionOwner;
private class ListenerInfo {
final int mUid;
final String mPackageName;
ListenerInfo(int uid, String packageName) {
mUid = uid;
mPackageName = packageName;
}
}
private class PerUserClipboard {
final int userId;
final RemoteCallbackList<IOnPrimaryClipChangedListener> primaryClipListeners
= new RemoteCallbackList<IOnPrimaryClipChangedListener>();
ClipData primaryClip;
final HashSet<String> activePermissionOwners
= new HashSet<String>();
PerUserClipboard(int userId) {
this.userId = userId;
}
}
private SparseArray<PerUserClipboard> mClipboards = new SparseArray<PerUserClipboard>();
/**
* Instantiates the clipboard.
*/
public ClipboardService(Context context) {
mContext = context;
mAm = ActivityManagerNative.getDefault();
mPm = context.getPackageManager();
mAppOps = (AppOpsManager)context.getSystemService(Context.APP_OPS_SERVICE);
IBinder permOwner = null;
try {
permOwner = mAm.newUriPermissionOwner("clipboard");
} catch (RemoteException e) {
Slog.w("clipboard", "AM dead", e);
}
mPermissionOwner = permOwner;
// Remove the clipboard if a user is removed
IntentFilter userFilter = new IntentFilter();
userFilter.addAction(Intent.ACTION_USER_REMOVED);
mContext.registerReceiver(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (Intent.ACTION_USER_REMOVED.equals(action)) {
removeClipboard(intent.getIntExtra(Intent.EXTRA_USER_HANDLE, 0));
}
}
}, userFilter);
}
@Override
public boolean onTransact(int code, Parcel data, Parcel reply, int flags)
throws RemoteException {
try {
return super.onTransact(code, data, reply, flags);
} catch (RuntimeException e) {
if (!(e instanceof SecurityException)) {
Slog.wtf("clipboard", "Exception: ", e);
}
throw e;
}
}
private PerUserClipboard getClipboard() {
return getClipboard(UserHandle.getCallingUserId());
}
private PerUserClipboard getClipboard(int userId) {
synchronized (mClipboards) {
PerUserClipboard puc = mClipboards.get(userId);
if (puc == null) {
puc = new PerUserClipboard(userId);
mClipboards.put(userId, puc);
}
return puc;
}
}
private void removeClipboard(int userId) {
synchronized (mClipboards) {
mClipboards.remove(userId);
}
}
public void setPrimaryClip(ClipData clip, String callingPackage) {
synchronized (this) {
if (clip != null && clip.getItemCount() <= 0) {
throw new IllegalArgumentException("No items");
}
final int callingUid = Binder.getCallingUid();
if (mAppOps.noteOp(AppOpsManager.OP_WRITE_CLIPBOARD, callingUid,
callingPackage) != AppOpsManager.MODE_ALLOWED) {
return;
}
checkDataOwnerLocked(clip, callingUid);
clearActiveOwnersLocked();
PerUserClipboard clipboard = getClipboard();
clipboard.primaryClip = clip;
final long ident = Binder.clearCallingIdentity();
final int n = clipboard.primaryClipListeners.beginBroadcast();
try {
for (int i = 0; i < n; i++) {
try {
ListenerInfo li = (ListenerInfo)
clipboard.primaryClipListeners.getBroadcastCookie(i);
if (mAppOps.checkOpNoThrow(AppOpsManager.OP_READ_CLIPBOARD, li.mUid,
li.mPackageName) == AppOpsManager.MODE_ALLOWED) {
clipboard.primaryClipListeners.getBroadcastItem(i)
.dispatchPrimaryClipChanged();
}
} catch (RemoteException e) {
// The RemoteCallbackList will take care of removing
// the dead object for us.
}
}
} finally {
clipboard.primaryClipListeners.finishBroadcast();
Binder.restoreCallingIdentity(ident);
}
}
}
public ClipData getPrimaryClip(String pkg) {
synchronized (this) {
if (mAppOps.noteOp(AppOpsManager.OP_READ_CLIPBOARD, Binder.getCallingUid(),
pkg) != AppOpsManager.MODE_ALLOWED) {
return null;
}
addActiveOwnerLocked(Binder.getCallingUid(), pkg);
return getClipboard().primaryClip;
}
}
public ClipDescription getPrimaryClipDescription(String callingPackage) {
synchronized (this) {
if (mAppOps.checkOp(AppOpsManager.OP_READ_CLIPBOARD, Binder.getCallingUid(),
callingPackage) != AppOpsManager.MODE_ALLOWED) {
return null;
}
PerUserClipboard clipboard = getClipboard();
return clipboard.primaryClip != null ? clipboard.primaryClip.getDescription() : null;
}
}
public boolean hasPrimaryClip(String callingPackage) {
synchronized (this) {
if (mAppOps.checkOp(AppOpsManager.OP_READ_CLIPBOARD, Binder.getCallingUid(),
callingPackage) != AppOpsManager.MODE_ALLOWED) {
return false;
}
return getClipboard().primaryClip != null;
}
}
public void addPrimaryClipChangedListener(IOnPrimaryClipChangedListener listener,
String callingPackage) {
synchronized (this) {
getClipboard().primaryClipListeners.register(listener,
new ListenerInfo(Binder.getCallingUid(), callingPackage));
}
}
public void removePrimaryClipChangedListener(IOnPrimaryClipChangedListener listener) {
synchronized (this) {
getClipboard().primaryClipListeners.unregister(listener);
}
}
public boolean hasClipboardText(String callingPackage) {
synchronized (this) {
if (mAppOps.checkOp(AppOpsManager.OP_READ_CLIPBOARD, Binder.getCallingUid(),
callingPackage) != AppOpsManager.MODE_ALLOWED) {
return false;
}
PerUserClipboard clipboard = getClipboard();
if (clipboard.primaryClip != null) {
CharSequence text = clipboard.primaryClip.getItemAt(0).getText();
return text != null && text.length() > 0;
}
return false;
}
}
private final void checkUriOwnerLocked(Uri uri, int uid) {
if (!"content".equals(uri.getScheme())) {
return;
}
long ident = Binder.clearCallingIdentity();
try {
// This will throw SecurityException for us.
mAm.checkGrantUriPermission(uid, null, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION);
} catch (RemoteException e) {
} finally {
Binder.restoreCallingIdentity(ident);
}
}
private final void checkItemOwnerLocked(ClipData.Item item, int uid) {
if (item.getUri() != null) {
checkUriOwnerLocked(item.getUri(), uid);
}
Intent intent = item.getIntent();
if (intent != null && intent.getData() != null) {
checkUriOwnerLocked(intent.getData(), uid);
}
}
private final void checkDataOwnerLocked(ClipData data, int uid) {
final int N = data.getItemCount();
for (int i=0; i<N; i++) {
checkItemOwnerLocked(data.getItemAt(i), uid);
}
}
private final void grantUriLocked(Uri uri, String pkg) {
long ident = Binder.clearCallingIdentity();
try {
mAm.grantUriPermissionFromOwner(mPermissionOwner, Process.myUid(), pkg, uri,
Intent.FLAG_GRANT_READ_URI_PERMISSION);
} catch (RemoteException e) {
} finally {
Binder.restoreCallingIdentity(ident);
}
}
private final void grantItemLocked(ClipData.Item item, String pkg) {
if (item.getUri() != null) {
grantUriLocked(item.getUri(), pkg);
}
Intent intent = item.getIntent();
if (intent != null && intent.getData() != null) {
grantUriLocked(intent.getData(), pkg);
}
}
private final void addActiveOwnerLocked(int uid, String pkg) {
final IPackageManager pm = AppGlobals.getPackageManager();
final int targetUserHandle = UserHandle.getCallingUserId();
final long oldIdentity = Binder.clearCallingIdentity();
try {
PackageInfo pi = pm.getPackageInfo(pkg, 0, targetUserHandle);
if (pi == null) {
throw new IllegalArgumentException("Unknown package " + pkg);
}
if (!UserHandle.isSameApp(pi.applicationInfo.uid, uid)) {
throw new SecurityException("Calling uid " + uid
+ " does not own package " + pkg);
}
} catch (RemoteException e) {
// Can't happen; the package manager is in the same process
} finally {
Binder.restoreCallingIdentity(oldIdentity);
}
PerUserClipboard clipboard = getClipboard();
if (clipboard.primaryClip != null && !clipboard.activePermissionOwners.contains(pkg)) {
final int N = clipboard.primaryClip.getItemCount();
for (int i=0; i<N; i++) {
grantItemLocked(clipboard.primaryClip.getItemAt(i), pkg);
}
clipboard.activePermissionOwners.add(pkg);
}
}
private final void revokeUriLocked(Uri uri) {
long ident = Binder.clearCallingIdentity();
try {
mAm.revokeUriPermissionFromOwner(mPermissionOwner, uri,
Intent.FLAG_GRANT_READ_URI_PERMISSION
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
} catch (RemoteException e) {
} finally {
Binder.restoreCallingIdentity(ident);
}
}
private final void revokeItemLocked(ClipData.Item item) {
if (item.getUri() != null) {
revokeUriLocked(item.getUri());
}
Intent intent = item.getIntent();
if (intent != null && intent.getData() != null) {
revokeUriLocked(intent.getData());
}
}
private final void clearActiveOwnersLocked() {
PerUserClipboard clipboard = getClipboard();
clipboard.activePermissionOwners.clear();
if (clipboard.primaryClip == null) {
return;
}
final int N = clipboard.primaryClip.getItemCount();
for (int i=0; i<N; i++) {
revokeItemLocked(clipboard.primaryClip.getItemAt(i));
}
}
}
|