1 /* $OpenBSD: t_setuid.c,v 1.2 2021/12/13 16:56:48 deraadt Exp $ */ 2 /* $NetBSD: t_setuid.c,v 1.1 2011/07/07 06:57:54 jruoho Exp $ */ 3 4 /*- 5 * Copyright (c) 2011 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Jukka Ruohonen. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include "macros.h" 34 35 #include <sys/wait.h> 36 37 #include "atf-c.h" 38 #include <errno.h> 39 #include <pwd.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 43 ATF_TC(setuid_perm); 44 ATF_TC_HEAD(setuid_perm, tc) 45 { 46 atf_tc_set_md_var(tc, "descr", "Test setuid(0) as normal user"); 47 atf_tc_set_md_var(tc, "require.user", "unprivileged"); 48 } 49 50 ATF_TC_BODY(setuid_perm, tc) 51 { 52 errno = 0; 53 54 ATF_REQUIRE(setuid(0) == -1); 55 ATF_REQUIRE(errno == EPERM); 56 } 57 58 ATF_TC(setuid_real); 59 ATF_TC_HEAD(setuid_real, tc) 60 { 61 atf_tc_set_md_var(tc, "descr", "Test setuid(2) with real UID"); 62 } 63 64 ATF_TC_BODY(setuid_real, tc) 65 { 66 uid_t uid = getuid(); 67 68 ATF_REQUIRE(setuid(uid) == 0); 69 70 ATF_REQUIRE(getuid() == uid); 71 ATF_REQUIRE(geteuid() == uid); 72 } 73 74 ATF_TC(setuid_root); 75 ATF_TC_HEAD(setuid_root, tc) 76 { 77 atf_tc_set_md_var(tc, "descr", "A basic test of setuid(2)"); 78 atf_tc_set_md_var(tc, "require.user", "root"); 79 } 80 81 ATF_TC_BODY(setuid_root, tc) 82 { 83 struct passwd *pw; 84 int rv, sta; 85 pid_t pid; 86 uid_t uid; 87 88 while ((pw = getpwent()) != NULL) { 89 90 pid = fork(); 91 ATF_REQUIRE(pid >= 0); 92 93 if (pid == 0) { 94 95 rv = setuid(pw->pw_uid); 96 97 if (rv != 0) 98 _exit(EXIT_FAILURE); 99 100 uid = getuid(); 101 102 if (uid != pw->pw_uid) 103 _exit(EXIT_FAILURE); 104 105 _exit(EXIT_SUCCESS); 106 } 107 108 (void)wait(&sta); 109 110 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 111 atf_tc_fail("failed to change UID to %u", pw->pw_uid); 112 } 113 } 114 115 ATF_TP_ADD_TCS(tp) 116 { 117 118 ATF_TP_ADD_TC(tp, setuid_perm); 119 ATF_TP_ADD_TC(tp, setuid_real); 120 ATF_TP_ADD_TC(tp, setuid_root); 121 122 return atf_no_error(); 123 } 124