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