1 /*- 2 * Copyright (c) 2006 nCircle Network Security, Inc. 3 * All rights reserved. 4 * 5 * This software was developed by Robert N. M. Watson for the TrustedBSD 6 * Project under contract to nCircle Network Security, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY, 21 * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 23 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 24 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 25 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 26 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 /* 33 * Confirm that privilege is required to invoke settimeofday(). So as not 34 * to mess up the clock too much, first query the time, then immediately set 35 * it. 36 */ 37 38 #include <sys/time.h> 39 40 #include <err.h> 41 #include <errno.h> 42 #include <unistd.h> 43 44 #include "main.h" 45 46 void 47 priv_settimeofday(void) 48 { 49 struct timeval tv; 50 int error; 51 52 assert_root(); 53 54 /* 55 * Query time. 56 */ 57 if (gettimeofday(&tv, NULL) < 0) 58 err(-1, "gettimeofday"); 59 60 /* 61 * Set with privilege. 62 */ 63 if (settimeofday(&tv, NULL) < 0) 64 err(-1, "settimeofday as root"); 65 66 /* 67 * Set without privilege. 68 */ 69 set_euid(UID_OTHER); 70 71 error = settimeofday(&tv, NULL); 72 if (error == 0) 73 errx(-1, "settimeofday succeeded as !root"); 74 if (errno != EPERM) 75 errx(-1, "settimeofday wrong errno %d as !root", errno); 76 } 77