/*      $NetBSD: secure_path.c,v 1.2 2003/01/06 20:30:30 wiz Exp $      */

/*-
* Copyright (c) 1995,1997 Berkeley Software Design, Inc. 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 Berkeley Software Design,
*      Inc.
* 4. The name of Berkeley Software Design, Inc.  may not be used to endorse
*    or promote products derived from this software without specific prior
*    written permission.
*
* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``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 BERKELEY SOFTWARE DESIGN, INC. 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.
*
*      BSDI login_cap.c,v 2.13 1998/02/07 03:17:05 prb Exp
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: secure_path.c,v 1.2 2003/01/06 20:30:30 wiz Exp $");
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/stat.h>

#include <assert.h>
#include <syslog.h>
#include <util.h>

int
secure_path(const char *path)
{
       struct stat sb;

       _DIAGASSERT(path != NULL);

       /*
        * If not a regular file, or is owned/writable by someone
        * other than root, quit.
        */
       if (lstat(path, &sb) < 0)
               /* syslog(LOG_ERR, "cannot stat %s: %m", path) */;
       else if (!S_ISREG(sb.st_mode))
               syslog(LOG_ERR, "%s: not a regular file", path);
       else if (sb.st_uid != 0)
               syslog(LOG_ERR, "%s: not owned by root", path);
       else if ((sb.st_mode & (S_IWGRP | S_IWOTH)) != 0)
               syslog(LOG_ERR, "%s: writable by non-root", path);
       else
               return (0);

       return (-1);
}