101 lines
1.9 KiB
C
101 lines
1.9 KiB
C
/*
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* hfsutils - tools for reading and writing Macintosh HFS volumes
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* Copyright (C) 1996-1998 Robert Leslie
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id: suid.c,v 1.7 1998/04/11 08:27:00 rob Exp $
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*/
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# ifdef HAVE_CONFIG_H
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# include "config.h"
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# endif
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# include <sys/types.h>
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# ifdef HAVE_UNISTD_H
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# include <unistd.h>
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# else
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uid_t getuid(void);
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uid_t geteuid(void);
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gid_t getgid(void);
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gid_t getegid(void);
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# ifdef HAVE_SETREUID
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int setreuid(uid_t, uid_t);
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int setregid(gid_t, gid_t);
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# else
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int setuid(uid_t);
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int setgid(gid_t);
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# endif
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# endif
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# include "suid.h"
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static uid_t uid, euid;
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static gid_t gid, egid;
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/*
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* NAME: suid->init()
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* DESCRIPTION: initialize application which may be running setuid/setgid
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*/
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void suid_init(void)
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{
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uid = getuid();
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gid = getgid();
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euid = geteuid();
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egid = getegid();
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suid_disable();
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}
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/*
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* NAME: suid->enable()
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* DESCRIPTION: engage any setuid privileges
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*/
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void suid_enable(void)
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{
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# ifdef HAVE_SETREUID
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setreuid(-1, euid);
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setregid(-1, egid);
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# else
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setuid(euid);
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setgid(egid);
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# endif
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}
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/*
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* NAME: suid->disable()
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* DESCRIPTION: revoke all setuid privileges
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*/
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void suid_disable(void)
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{
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# ifdef HAVE_SETREUID
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setreuid(-1, uid);
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setregid(-1, gid);
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# else
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setuid(uid);
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setgid(gid);
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# endif
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}
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