| 1 | #ifndef _COMPAT_GETENV_H |
| 2 | #define _COMPAT_GETENV_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; only |
| 10 | * version 2.1 of the License. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with this library; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include <stdlib.h> |
| 23 | #include <unistd.h> |
| 24 | #include <sys/types.h> |
| 25 | #include <usterr-signal-safe.h> |
| 26 | |
| 27 | static inline |
| 28 | int lttng_is_setuid_setgid(void) |
| 29 | { |
| 30 | return geteuid() != getuid() || getegid() != getgid(); |
| 31 | } |
| 32 | |
| 33 | static inline |
| 34 | char *lttng_secure_getenv(const char *name) |
| 35 | { |
| 36 | if (lttng_is_setuid_setgid()) { |
| 37 | ERR("Getting environment variable '%s' from setuid/setgid binary refused for security reasons.", |
| 38 | name); |
| 39 | return NULL; |
| 40 | } |
| 41 | return getenv(name); |
| 42 | } |
| 43 | |
| 44 | #endif /* _COMPAT_GETENV_H */ |