1 /* $NetBSD: t_chroot.c,v 1.2 2017/01/10 22:36:29 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jukka Ruohonen. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #include <sys/cdefs.h> 32 __RCSID("$NetBSD: t_chroot.c,v 1.2 2017/01/10 22:36:29 christos Exp $"); 33 34 #include <sys/wait.h> 35 #include <sys/stat.h> 36 37 #include <atf-c.h> 38 #include <errno.h> 39 #include <fcntl.h> 40 #include <limits.h> 41 #include <pwd.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 ATF_TC(chroot_basic); 47 ATF_TC_HEAD(chroot_basic, tc) 48 { 49 atf_tc_set_md_var(tc, "descr", "A basic test of chroot(2)"); 50 atf_tc_set_md_var(tc, "require.user", "root"); 51 } 52 53 ATF_TC_BODY(chroot_basic, tc) 54 { 55 char buf[PATH_MAX]; 56 int fd, sta; 57 pid_t pid; 58 59 (void)memset(buf, '\0', sizeof(buf)); 60 (void)getcwd(buf, sizeof(buf)); 61 (void)strlcat(buf, "/dir", sizeof(buf)); 62 63 ATF_REQUIRE(mkdir(buf, 0500) == 0); 64 ATF_REQUIRE(chdir(buf) == 0); 65 66 pid = fork(); 67 ATF_REQUIRE(pid >= 0); 68 69 if (pid == 0) { 70 71 if (chroot(buf) != 0) 72 _exit(EXIT_FAILURE); 73 74 errno = 0; 75 76 if (chroot("/root") != -1) 77 _exit(EXIT_FAILURE); 78 79 if (errno != ENOENT) 80 _exit(EXIT_FAILURE); 81 82 fd = open("file", O_RDONLY | O_CREAT, 0600); 83 84 if (fd < 0) 85 _exit(EXIT_FAILURE); 86 87 if (close(fd) != 0) 88 _exit(EXIT_FAILURE); 89 90 _exit(EXIT_SUCCESS); 91 } 92 93 (void)wait(&sta); 94 95 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 96 atf_tc_fail("chroot(2) failed"); 97 98 (void)chdir("/"); 99 (void)strlcat(buf, "/file", sizeof(buf)); 100 101 fd = open(buf, O_RDONLY); 102 103 if (fd < 0) 104 atf_tc_fail("chroot(2) did not change the root directory"); 105 106 ATF_REQUIRE(close(fd) == 0); 107 ATF_REQUIRE(unlink(buf) == 0); 108 } 109 110 ATF_TC(chroot_err); 111 ATF_TC_HEAD(chroot_err, tc) 112 { 113 atf_tc_set_md_var(tc, "descr", "Test error conditions of chroot(2)"); 114 atf_tc_set_md_var(tc, "require.user", "root"); 115 } 116 117 ATF_TC_BODY(chroot_err, tc) 118 { 119 char buf[PATH_MAX + 1]; 120 121 (void)memset(buf, 'x', sizeof(buf)); 122 123 errno = 0; 124 ATF_REQUIRE_ERRNO(ENAMETOOLONG, chroot(buf) == -1); 125 126 errno = 0; 127 ATF_REQUIRE_ERRNO(EFAULT, chroot((void *)-1) == -1); 128 129 errno = 0; 130 ATF_REQUIRE_ERRNO(ENOENT, chroot("/a/b/c/d/e/f/g/h/i/j") == -1); 131 } 132 133 ATF_TC(chroot_perm); 134 ATF_TC_HEAD(chroot_perm, tc) 135 { 136 atf_tc_set_md_var(tc, "descr", "Test permissions with chroot(2)"); 137 atf_tc_set_md_var(tc, "require.user", "unprivileged"); 138 } 139 140 ATF_TC_BODY(chroot_perm, tc) 141 { 142 static char buf[LINE_MAX]; 143 pid_t pid; 144 int sta; 145 146 (void)memset(buf, '\0', sizeof(buf)); 147 ATF_REQUIRE(getcwd(buf, sizeof(buf)) != NULL); 148 149 pid = fork(); 150 ATF_REQUIRE(pid >= 0); 151 152 if (pid == 0) { 153 154 errno = 0; 155 156 if (chroot(buf) != -1) 157 _exit(EXIT_FAILURE); 158 159 if (errno != EPERM) 160 _exit(EXIT_FAILURE); 161 162 _exit(EXIT_SUCCESS); 163 } 164 165 (void)wait(&sta); 166 167 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 168 atf_tc_fail("chroot(2) succeeded as unprivileged user"); 169 } 170 171 ATF_TC(fchroot_basic); 172 ATF_TC_HEAD(fchroot_basic, tc) 173 { 174 atf_tc_set_md_var(tc, "descr", "A basic test of fchroot(2)"); 175 atf_tc_set_md_var(tc, "require.user", "root"); 176 } 177 178 ATF_TC_BODY(fchroot_basic, tc) 179 { 180 char buf[PATH_MAX]; 181 int fd, sta; 182 pid_t pid; 183 184 (void)memset(buf, '\0', sizeof(buf)); 185 (void)getcwd(buf, sizeof(buf)); 186 (void)strlcat(buf, "/dir", sizeof(buf)); 187 188 ATF_REQUIRE(mkdir(buf, 0500) == 0); 189 ATF_REQUIRE(chdir(buf) == 0); 190 191 fd = open(buf, O_RDONLY); 192 ATF_REQUIRE(fd >= 0); 193 194 pid = fork(); 195 ATF_REQUIRE(pid >= 0); 196 197 if (pid == 0) { 198 199 if (fchroot(fd) != 0) 200 _exit(EXIT_FAILURE); 201 202 if (close(fd) != 0) 203 _exit(EXIT_FAILURE); 204 205 fd = open("file", O_RDONLY | O_CREAT, 0600); 206 207 if (fd < 0) 208 _exit(EXIT_FAILURE); 209 210 if (close(fd) != 0) 211 _exit(EXIT_FAILURE); 212 213 _exit(EXIT_SUCCESS); 214 } 215 216 (void)wait(&sta); 217 218 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 219 atf_tc_fail("fchroot(2) failed"); 220 221 (void)chdir("/"); 222 (void)strlcat(buf, "/file", sizeof(buf)); 223 224 fd = open(buf, O_RDONLY); 225 226 if (fd < 0) 227 atf_tc_fail("fchroot(2) did not change the root directory"); 228 229 ATF_REQUIRE(close(fd) == 0); 230 ATF_REQUIRE(unlink(buf) == 0); 231 } 232 233 ATF_TC(fchroot_err); 234 ATF_TC_HEAD(fchroot_err, tc) 235 { 236 atf_tc_set_md_var(tc, "descr", "Test error conditions of fchroot(2)"); 237 atf_tc_set_md_var(tc, "require.user", "root"); 238 } 239 240 ATF_TC_BODY(fchroot_err, tc) 241 { 242 int fd; 243 244 fd = open("/etc/passwd", O_RDONLY); 245 ATF_REQUIRE(fd >= 0); 246 247 errno = 0; 248 ATF_REQUIRE_ERRNO(EBADF, fchroot(-1) == -1); 249 250 errno = 0; 251 ATF_REQUIRE_ERRNO(ENOTDIR, fchroot(fd) == -1); 252 253 ATF_REQUIRE(close(fd) == 0); 254 } 255 256 ATF_TC(fchroot_perm); 257 ATF_TC_HEAD(fchroot_perm, tc) 258 { 259 atf_tc_set_md_var(tc, "descr", "Test permissions with fchroot(2)"); 260 atf_tc_set_md_var(tc, "require.user", "root"); 261 } 262 263 ATF_TC_BODY(fchroot_perm, tc) 264 { 265 static char buf[LINE_MAX]; 266 struct passwd *pw; 267 int fd, sta; 268 pid_t pid; 269 270 (void)memset(buf, '\0', sizeof(buf)); 271 ATF_REQUIRE(getcwd(buf, sizeof(buf)) != NULL); 272 273 pw = getpwnam("nobody"); 274 fd = open(buf, O_RDONLY); 275 276 ATF_REQUIRE(fd >= 0); 277 ATF_REQUIRE(pw != NULL); 278 279 pid = fork(); 280 ATF_REQUIRE(pid >= 0); 281 282 if (pid == 0) { 283 284 (void)setuid(pw->pw_uid); 285 286 errno = 0; 287 288 if (fchroot(fd) != -1) 289 _exit(EXIT_FAILURE); 290 291 if (errno != EPERM) 292 _exit(EXIT_FAILURE); 293 294 _exit(EXIT_SUCCESS); 295 } 296 297 (void)wait(&sta); 298 299 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 300 atf_tc_fail("fchroot(2) succeeded as unprivileged user"); 301 } 302 303 ATF_TP_ADD_TCS(tp) 304 { 305 306 ATF_TP_ADD_TC(tp, chroot_basic); 307 ATF_TP_ADD_TC(tp, chroot_err); 308 ATF_TP_ADD_TC(tp, chroot_perm); 309 ATF_TP_ADD_TC(tp, fchroot_basic); 310 ATF_TP_ADD_TC(tp, fchroot_err); 311 ATF_TP_ADD_TC(tp, fchroot_perm); 312 313 return atf_no_error(); 314 } 315