SenderPackageFilter.java revision b2340f3fcc2cfded97e0372a336bcf6f9211e0c1 
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.os.RemoteException;
24import android.os.UserHandle;
25
26import org.xmlpull.v1.XmlPullParser;
27import org.xmlpull.v1.XmlPullParserException;
28
29import java.io.IOException;
30
31public class SenderPackageFilter implements Filter {
32    private static final String ATTR_NAME = "name";
33
34    public final String mPackageName;
35
36    public SenderPackageFilter(String packageName) {
37        mPackageName = packageName;
38    }
39
40    @Override
41    public boolean matches(IntentFirewall ifw, ComponentName resolvedComponent, Intent intent,
42            int callerUid, int callerPid, String resolvedType, int receivingUid) {
43        IPackageManager pm = AppGlobals.getPackageManager();
44
45        int packageUid = -1;
46        try {
47            packageUid = pm.getPackageUid(mPackageName, UserHandle.USER_OWNER);
48        } catch (RemoteException ex) {
49            // handled below
50        }
51
52        if (packageUid == -1)  {
53            return false;
54        }
55
56        return UserHandle.isSameApp(packageUid, callerUid);
57    }
58
59    public static final FilterFactory FACTORY = new FilterFactory("sender-package") {
60        @Override
61        public Filter newFilter(XmlPullParser parser)
62                throws IOException, XmlPullParserException {
63            String packageName = parser.getAttributeValue(null, ATTR_NAME);
64
65            if (packageName == null) {
66                throw new XmlPullParserException(
67                    "A package name must be specified.", parser, null);
68            }
69
70            return new SenderPackageFilter(packageName);
71        }
72    };
73}
74