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      1 /*	$NetBSD: secure_path.c,v 1.2 2003/01/06 20:30:30 wiz Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1995,1997 Berkeley Software Design, Inc. All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by Berkeley Software Design,
     17  *	Inc.
     18  * 4. The name of Berkeley Software Design, Inc.  may not be used to endorse
     19  *    or promote products derived from this software without specific prior
     20  *    written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN, INC. BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	BSDI login_cap.c,v 2.13 1998/02/07 03:17:05 prb Exp
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 #if defined(LIBC_SCCS) && !defined(lint)
     39 __RCSID("$NetBSD: secure_path.c,v 1.2 2003/01/06 20:30:30 wiz Exp $");
     40 #endif /* LIBC_SCCS and not lint */
     41 
     42 #include <sys/types.h>
     43 #include <sys/stat.h>
     44 
     45 #include <assert.h>
     46 #include <syslog.h>
     47 #include <util.h>
     48 
     49 int
     50 secure_path(const char *path)
     51 {
     52 	struct stat sb;
     53 
     54 	_DIAGASSERT(path != NULL);
     55 
     56 	/*
     57 	 * If not a regular file, or is owned/writable by someone
     58 	 * other than root, quit.
     59 	 */
     60 	if (lstat(path, &sb) < 0)
     61 		/* syslog(LOG_ERR, "cannot stat %s: %m", path) */;
     62 	else if (!S_ISREG(sb.st_mode))
     63 		syslog(LOG_ERR, "%s: not a regular file", path);
     64 	else if (sb.st_uid != 0)
     65 		syslog(LOG_ERR, "%s: not owned by root", path);
     66 	else if ((sb.st_mode & (S_IWGRP | S_IWOTH)) != 0)
     67 		syslog(LOG_ERR, "%s: writable by non-root", path);
     68 	else
     69 		return (0);
     70 
     71 	return (-1);
     72 }
     73