| /* Copyright (C) 2017-2020 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| GCC is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _SECURE_GETENV_H |
| #define _SECURE_GETENV_H 1 |
| |
| /* Secure getenv() which returns NULL if running as SUID/SGID. */ |
| #ifndef HAVE_SECURE_GETENV |
| #if defined (HAVE_UNISTD_H) && defined (HAVE_GETUID) \ |
| && defined (HAVE_GETEUID) && defined (HAVE_GETGID) \ |
| && defined (HAVE_GETEGID) |
| |
| #include <unistd.h> |
| |
| #if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV) |
| static char* weak_secure_getenv (const char*) |
| __attribute__((__weakref__("__secure_getenv"))); |
| #endif |
| |
| /* Implementation of secure_getenv() for targets where it is not provided but |
| we have at least means to test real and effective IDs. */ |
| |
| static inline char * |
| secure_getenv (const char *name) |
| { |
| #if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV) |
| if (weak_secure_getenv) |
| return weak_secure_getenv (name); |
| #endif |
| |
| if ((getuid () == geteuid ()) && (getgid () == getegid ())) |
| return getenv (name); |
| else |
| return NULL; |
| } |
| #else |
| #define secure_getenv getenv |
| #endif |
| #endif |
| |
| #endif /* _SECURE_GETENV_H. */ |