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/*
* Copyright (c) 1982, 1986, 1989, 1990, 1991 Regents of the University
* of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$OpenBSD: __setreuid.c,v 1.4 1998/11/15 19:52:11 deraadt Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
int
__setreuid(ruid, euid)
uid_t ruid, euid;
{
static uid_t svuid = (uid_t) -1;
uid_t sruid;
if (svuid == (uid_t) -1)
svuid = geteuid();
sruid = getuid();
/*
* we assume that the intent of setting ruid is to be able to get
* back ruid priviledge. So we make sure that we will be able to
* do so, but do not actually set the ruid.
*/
if (ruid != (uid_t) -1 && ruid != sruid && ruid != svuid &&
svuid != 0 && sruid != 0) {
errno = EPERM;
return (-1);
}
/*
* If we are root and want to change our real uid, do so.
* Since this clobbers our euid, we must do this before
* we seteuid()
*/
if ((svuid == 0 || sruid == 0) && ruid != -1)
setuid(ruid);
if (euid != (uid_t) -1 && seteuid(euid) < 0)
return (-1);
return (0);
}
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