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
