1/*
2 * Copyright (C) 2005 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
17#define LOG_TAG "PermissionController"
18
19#include <binder/IPermissionController.h>
20
21#include <utils/Log.h>
22#include <binder/Parcel.h>
23#include <utils/String8.h>
24
25#include <private/binder/Static.h>
26
27namespace android {
28
29// ----------------------------------------------------------------------
30
31class BpPermissionController : public BpInterface<IPermissionController>
32{
33public:
34    explicit BpPermissionController(const sp<IBinder>& impl)
35        : BpInterface<IPermissionController>(impl)
36    {
37    }
38
39    virtual bool checkPermission(const String16& permission, int32_t pid, int32_t uid)
40    {
41        Parcel data, reply;
42        data.writeInterfaceToken(IPermissionController::getInterfaceDescriptor());
43        data.writeString16(permission);
44        data.writeInt32(pid);
45        data.writeInt32(uid);
46        remote()->transact(CHECK_PERMISSION_TRANSACTION, data, &reply);
47        // fail on exception
48        if (reply.readExceptionCode() != 0) return 0;
49        return reply.readInt32() != 0;
50    }
51
52    virtual void getPackagesForUid(const uid_t uid, Vector<String16>& packages)
53    {
54        Parcel data, reply;
55        data.writeInterfaceToken(IPermissionController::getInterfaceDescriptor());
56        data.writeInt32(uid);
57        remote()->transact(GET_PACKAGES_FOR_UID_TRANSACTION, data, &reply);
58        // fail on exception
59        if (reply.readExceptionCode() != 0) {
60            return;
61        }
62        const int32_t size = reply.readInt32();
63        if (size <= 0) {
64            return;
65        }
66        for (int i = 0; i < size; i++) {
67            packages.push(reply.readString16());
68        }
69    }
70
71    virtual bool isRuntimePermission(const String16& permission)
72    {
73        Parcel data, reply;
74        data.writeInterfaceToken(IPermissionController::getInterfaceDescriptor());
75        data.writeString16(permission);
76        remote()->transact(IS_RUNTIME_PERMISSION_TRANSACTION, data, &reply);
77        // fail on exception
78        if (reply.readExceptionCode() != 0) return false;
79        return reply.readInt32() != 0;
80    }
81};
82
83IMPLEMENT_META_INTERFACE(PermissionController, "android.os.IPermissionController");
84
85// ----------------------------------------------------------------------
86
87status_t BnPermissionController::onTransact(
88    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
89{
90    switch(code) {
91        case CHECK_PERMISSION_TRANSACTION: {
92            CHECK_INTERFACE(IPermissionController, data, reply);
93            String16 permission = data.readString16();
94            int32_t pid = data.readInt32();
95            int32_t uid = data.readInt32();
96            bool res = checkPermission(permission, pid, uid);
97            reply->writeNoException();
98            reply->writeInt32(res ? 1 : 0);
99            return NO_ERROR;
100        } break;
101
102        case GET_PACKAGES_FOR_UID_TRANSACTION: {
103            CHECK_INTERFACE(IPermissionController, data, reply);
104            int32_t uid = data.readInt32();
105            Vector<String16> packages;
106            getPackagesForUid(uid, packages);
107            reply->writeNoException();
108            size_t size = packages.size();
109            reply->writeInt32(size);
110            for (size_t i = 0; i < size; i++) {
111                reply->writeString16(packages[i]);
112            }
113            return NO_ERROR;
114        } break;
115
116        case IS_RUNTIME_PERMISSION_TRANSACTION: {
117            CHECK_INTERFACE(IPermissionController, data, reply);
118            String16 permission = data.readString16();
119            const bool res = isRuntimePermission(permission);
120            reply->writeNoException();
121            reply->writeInt32(res ? 1 : 0);
122            return NO_ERROR;
123        } break;
124
125        default:
126            return BBinder::onTransact(code, data, reply, flags);
127    }
128}
129
130}; // namespace android
131