1 /*
2 * Copyright (C) 2011 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 #include <cutils/sockets.h>
18 #include <log/log.h>
19
20 #ifdef HAVE_ANDROID_OS
21 /* For the socket trust (credentials) check */
22 #include <private/android_filesystem_config.h>
23 #define __android_unused
24 #else
25 #define __android_unused __attribute__((__unused__))
26 #endif
27
socket_peer_is_trusted(int fd __android_unused)28 bool socket_peer_is_trusted(int fd __android_unused)
29 {
30 #ifdef HAVE_ANDROID_OS
31 struct ucred cr;
32 socklen_t len = sizeof(cr);
33 int n = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &len);
34
35 if (n != 0) {
36 ALOGE("could not get socket credentials: %s\n", strerror(errno));
37 return false;
38 }
39
40 if ((cr.uid != AID_ROOT) && (cr.uid != AID_SHELL)) {
41 ALOGE("untrusted userid on other end of socket: userid %d\n", cr.uid);
42 return false;
43 }
44 #endif
45
46 return true;
47 }
48