77 lines
3.0 KiB
C
77 lines
3.0 KiB
C
/* $NetBSD: privs.h,v 1.10 2016/03/13 00:33:12 dholland Exp $ */
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/*
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* privs.h - header for privileged operations
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* Copyright (C) 1993 Thomas Koenig
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. The name of the author(s) may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* From: OpenBSD: privs.h,v 1.4 1997/03/01 23:40:12 millert Exp
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*/
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#ifndef _PRIVS_H_
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#define _PRIVS_H_
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/*
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* Used by: usr.bin/at
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* Used by: libexec/atrun
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*/
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/*
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* Relinquish privileges temporarily for a setuid or setgid program
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* with the option of getting them back later. This is done by
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* using POSIX saved user and groups ids. Call RELINQUISH_PRIVS once
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* at the beginning of the main program. This will cause all operations
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* to be executed with the real userid. When you need the privileges
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* of the setuid/setgid invocation, call PRIV_START; when you no longer
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* need it, call PRIV_END. Note that it is an error to call PRIV_START
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* and not PRIV_END within the same function.
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*
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* Use RELINQUISH_PRIVS_ROOT(a,b) if your program started out running
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* as root, and you want to drop back the effective userid to a
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* and the effective group id to b, with the option to get them back
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* later.
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*
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* Problems: Do not use return between PRIV_START and PRIV_END; this
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* will cause the program to continue running in an unprivileged
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* state.
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*
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* It is NOT safe to call exec(), system() or popen() with a user-
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* supplied program (i.e. without carefully checking PATH and any
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* library load paths) with relinquished privileges; the called program
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* can acquire them just as easily. Set both effective and real userid
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* to the real userid before calling any of them.
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*/
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extern uid_t real_uid, effective_uid;
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extern gid_t real_gid, effective_gid;
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void privs_relinquish(void);
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void privs_relinquish_root(uid_t ruid, gid_t rgid);
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void privs_enter(void);
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void privs_exit(void);
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/* caller provides this */
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__dead void privs_fail(const char *msg);
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#endif /* _PRIV_H_ */
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