1 /* $NetBSD: secure_path.c,v 1.1 2001/08/20 14:47:50 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 1.1 2001/08/20 14:47:50 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/writeable 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: writeable by non-root", path); 68 else 69 return (0); 70 71 return (-1); 72 } 73