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      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 
     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