crypto/uid.c

   1 /*
   2  * Copyright 2001-2018 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__)
  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 # endif
  40
  41 int OPENSSL_issetugid(void)
  42 {
  43 # ifdef OSSL_IMPLEMENT_GETAUXVAL
  44     return getauxval(AT_SECURE) != 0;
  45 # else
  46     return getuid() != geteuid() || getgid() != getegid();
  47 # endif
  48 }
  49 #endif