1 /* 2 * Copyright 2001-2021 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <openssl/crypto.h> 11 #include <openssl/opensslconf.h> 12 13 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI) 14 15 int OPENSSL_issetugid(void) 16 { 17 return 0; 18 } 19 20 #elif defined(__OpenBSD__) || (defined(__FreeBSD__) && __FreeBSD__ > 2) || defined(__DragonFly__) || (defined(__GLIBC__) && defined(__FreeBSD_kernel__)) 21 22 # include <unistd.h> 23 24 int OPENSSL_issetugid(void) 25 { 26 return issetugid(); 27 } 28 29 #else 30 31 # include <unistd.h> 32 # include <sys/types.h> 33 34 # if defined(__GLIBC__) && defined(__GLIBC_PREREQ) 35 # if __GLIBC_PREREQ(2, 16) 36 # include <sys/auxv.h> 37 # define OSSL_IMPLEMENT_GETAUXVAL 38 # endif 39 # elif defined(__ANDROID_API__) 40 /* see https://developer.android.google.cn/ndk/guides/cpu-features */ 41 # if __ANDROID_API__ >= 18 42 # include <sys/auxv.h> 43 # define OSSL_IMPLEMENT_GETAUXVAL 44 # endif 45 # endif 46 47 int OPENSSL_issetugid(void) 48 { 49 # ifdef OSSL_IMPLEMENT_GETAUXVAL 50 return getauxval(AT_SECURE) != 0; 51 # else 52 return getuid() != geteuid() || getgid() != getegid(); 53 # endif 54 } 55 #endif 56