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a5544970 | 1 | /* Copyright (C) 2017-2019 Free Software Foundation, Inc. |
22f1a037 TV |
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. */ |