62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/* Copyright (C) 2017-2019 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SECURE_GETENV_H
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#define _SECURE_GETENV_H 1
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/* Secure getenv() which returns NULL if running as SUID/SGID. */
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#ifndef HAVE_SECURE_GETENV
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#if defined (HAVE_UNISTD_H) && defined (HAVE_GETUID) \
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&& defined (HAVE_GETEUID) && defined (HAVE_GETGID) \
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&& defined (HAVE_GETEGID)
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#include <unistd.h>
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#if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV)
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static char* weak_secure_getenv (const char*)
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__attribute__((__weakref__("__secure_getenv")));
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#endif
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/* Implementation of secure_getenv() for targets where it is not provided but
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we have at least means to test real and effective IDs. */
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static inline char *
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secure_getenv (const char *name)
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{
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#if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV)
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if (weak_secure_getenv)
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return weak_secure_getenv (name);
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#endif
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if ((getuid () == geteuid ()) && (getgid () == getegid ()))
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return getenv (name);
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else
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return NULL;
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}
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#else
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#define secure_getenv getenv
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#endif
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#endif
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#endif /* _SECURE_GETENV_H. */
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