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 com.android.server.firewall;
18
19import android.app.AppGlobals;
20import android.content.ComponentName;
21import android.content.Intent;
22import android.content.pm.IPackageManager;
23import android.content.pm.PackageManager;
24import android.os.RemoteException;
25import android.os.UserHandle;
26
27import org.xmlpull.v1.XmlPullParser;
28import org.xmlpull.v1.XmlPullParserException;
29
30import java.io.IOException;
31
32public class SenderPackageFilter implements Filter {
33    private static final String ATTR_NAME = "name";
34
35    public final String mPackageName;
36
37    public SenderPackageFilter(String packageName) {
38        mPackageName = packageName;
39    }
40
41    @Override
42    public boolean matches(IntentFirewall ifw, ComponentName resolvedComponent, Intent intent,
43            int callerUid, int callerPid, String resolvedType, int receivingUid) {
44        IPackageManager pm = AppGlobals.getPackageManager();
45
46        int packageUid = -1;
47        try {
48            // USER_SYSTEM here is not important. Only app id is used and getPackageUid() will
49            // return a uid whether the app is installed for a user or not.
50            packageUid = pm.getPackageUid(mPackageName, PackageManager.MATCH_UNINSTALLED_PACKAGES,
51                    UserHandle.USER_SYSTEM);
52        } catch (RemoteException ex) {
53            // handled below
54        }
55
56        if (packageUid == -1)  {
57            return false;
58        }
59
60        return UserHandle.isSameApp(packageUid, callerUid);
61    }
62
63    public static final FilterFactory FACTORY = new FilterFactory("sender-package") {
64        @Override
65        public Filter newFilter(XmlPullParser parser)
66                throws IOException, XmlPullParserException {
67            String packageName = parser.getAttributeValue(null, ATTR_NAME);
68
69            if (packageName == null) {
70                throw new XmlPullParserException(
71                    "A package name must be specified.", parser, null);
72            }
73
74            return new SenderPackageFilter(packageName);
75        }
76    };
77}
78