xref: /openssl/crypto/uid.c (revision da1c088f)
1 /*
2  * Copyright 2001-2023 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) || defined(__wasi__)
14 
OPENSSL_issetugid(void)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 
OPENSSL_issetugid(void)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 
OPENSSL_issetugid(void)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