1 /* Copyright (C) 2017-2018 Free Software Foundation, Inc. 2 3 This file is part of GCC. 4 5 GCC is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3, or (at your option) 8 any later version. 9 10 GCC is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 Under Section 7 of GPL version 3, you are granted additional 16 permissions described in the GCC Runtime Library Exception, version 17 3.1, as published by the Free Software Foundation. 18 19 You should have received a copy of the GNU General Public License and 20 a copy of the GCC Runtime Library Exception along with this program; 21 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 22 <http://www.gnu.org/licenses/>. */ 23 24 #ifndef _SECURE_GETENV_H 25 #define _SECURE_GETENV_H 1 26 27 /* Secure getenv() which returns NULL if running as SUID/SGID. */ 28 #ifndef HAVE_SECURE_GETENV 29 #if defined (HAVE_UNISTD_H) && defined (HAVE_GETUID) \ 30 && defined (HAVE_GETEUID) && defined (HAVE_GETGID) \ 31 && defined (HAVE_GETEGID) 32 33 #include <unistd.h> 34 35 #if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV) 36 static char* weak_secure_getenv (const char*) 37 __attribute__((__weakref__("__secure_getenv"))); 38 #endif 39 40 /* Implementation of secure_getenv() for targets where it is not provided but 41 we have at least means to test real and effective IDs. */ 42 43 static inline char * 44 secure_getenv (const char *name) 45 { 46 #if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV) 47 if (weak_secure_getenv) 48 return weak_secure_getenv (name); 49 #endif 50 51 if ((getuid () == geteuid ()) && (getgid () == getegid ())) 52 return getenv (name); 53 else 54 return NULL; 55 } 56 #else 57 #define secure_getenv getenv 58 #endif 59 #endif 60 61 #endif /* _SECURE_GETENV_H. */ 62