62 lines
2.4 KiB
C
62 lines
2.4 KiB
C
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/*
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* Copyright (c) 1982, 1986, 1989, 1990, 1991 Regents of the University
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* of California. All rights reserved.
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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. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)kern_prot.c 7.21 (Berkeley) 5/3/91
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* $Id: __setreuid.c,v 1.1 1994/04/10 06:32:40 cgd Exp $
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <unistd.h>
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int
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__setreuid(ruid, euid)
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uid_t ruid, euid;
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{
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static uid_t svuid = -1;
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if (svuid == -1)
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svuid = geteuid();
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/*
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* we assume that the intent of setting ruid is to be able to get
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* back ruid priviledge. So we make sure that we will be able to
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* do so, but do not actually set the ruid.
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*/
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if (ruid != -1 && ruid != getuid() && ruid != svuid) {
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errno = EPERM;
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return (-1);
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}
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if (euid != -1 && seteuid(euid) < 0)
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return (-1);
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return (0);
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}
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