1 /* $NetBSD: t_o_search.c,v 1.9 2020/02/06 12:18:06 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Emmanuel Dreyfus. 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_o_search.c,v 1.9 2020/02/06 12:18:06 martin Exp $"); 33 34 #include <atf-c.h> 35 36 #include <sys/types.h> 37 #ifdef __FreeBSD__ 38 #include <sys/mount.h> 39 #else 40 #include <sys/statvfs.h> 41 #endif 42 #include <sys/stat.h> 43 44 #include <dirent.h> 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <limits.h> 48 #include <paths.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <unistd.h> 52 #include <pwd.h> 53 54 /* 55 * dholland 20130112: disable tests that require O_SEARCH semantics 56 * until a decision is reached about the semantics of O_SEARCH and a 57 * non-broken implementation is available. 58 */ 59 #if defined(__FreeBSD__) || (O_MASK & O_SEARCH) != 0 60 #define USE_O_SEARCH 61 #endif 62 63 #define DIR "dir" 64 #define FILE "dir/o_search" 65 #define BASEFILE "o_search" 66 67 68 ATF_TC(o_search_perm1); 69 ATF_TC_HEAD(o_search_perm1, tc) 70 { 71 atf_tc_set_md_var(tc, "descr", "See that openat enforces search permission"); 72 atf_tc_set_md_var(tc, "require.user", "unprivileged"); 73 } 74 ATF_TC_BODY(o_search_perm1, tc) 75 { 76 int dfd; 77 int fd; 78 79 ATF_REQUIRE(mkdir(DIR, 0755) == 0); 80 ATF_REQUIRE((fd = open(FILE, O_CREAT|O_RDWR, 0644)) != -1); 81 ATF_REQUIRE(close(fd) == 0); 82 83 ATF_REQUIRE((dfd = open(DIR, O_RDONLY, 0)) != -1); 84 85 ATF_REQUIRE((fd = openat(dfd, BASEFILE, O_RDWR, 0)) != -1); 86 ATF_REQUIRE(close(fd) == 0); 87 88 ATF_REQUIRE(fchmod(dfd, 0644) == 0); 89 90 ATF_REQUIRE((fd = openat(dfd, BASEFILE, O_RDWR, 0)) == -1); 91 ATF_REQUIRE(errno == EACCES); 92 93 ATF_REQUIRE(close(dfd) == 0); 94 } 95 96 #ifdef USE_O_SEARCH 97 98 ATF_TC(o_search_root_flag1); 99 ATF_TC_HEAD(o_search_root_flag1, tc) 100 { 101 atf_tc_set_md_var(tc, "descr", "See that root openat honours O_SEARCH"); 102 atf_tc_set_md_var(tc, "require.user", "root"); 103 } 104 ATF_TC_BODY(o_search_root_flag1, tc) 105 { 106 int dfd; 107 int fd; 108 109 ATF_REQUIRE(mkdir(DIR, 0755) == 0); 110 ATF_REQUIRE((fd = open(FILE, O_CREAT|O_RDWR, 0644)) != -1); 111 ATF_REQUIRE(close(fd) == 0); 112 113 ATF_REQUIRE((dfd = open(DIR, O_RDONLY|O_SEARCH, 0)) != -1); 114 115 ATF_REQUIRE((fd = openat(dfd, BASEFILE, O_RDWR, 0)) != -1); 116 ATF_REQUIRE(close(fd) == 0); 117 118 ATF_REQUIRE(fchmod(dfd, 0644) == 0); 119 120 ATF_REQUIRE((fd = openat(dfd, BASEFILE, O_RDWR, 0)) != -1); 121 ATF_REQUIRE(close(fd) == 0); 122 123 ATF_REQUIRE(fchmod(dfd, 0444) == 0); 124 125 ATF_REQUIRE((fd = openat(dfd, BASEFILE, O_RDWR, 0)) != -1); 126 127 ATF_REQUIRE(close(dfd) == 0); 128 } 129 130 ATF_TC(o_search_unpriv_flag1); 131 ATF_TC_HEAD(o_search_unpriv_flag1, tc) 132 { 133 atf_tc_set_md_var(tc, "descr", "See that openat honours O_SEARCH"); 134 atf_tc_set_md_var(tc, "require.user", "unprivileged"); 135 } 136 ATF_TC_BODY(o_search_unpriv_flag1, tc) 137 { 138 int dfd; 139 int fd; 140 141 ATF_REQUIRE(mkdir(DIR, 0755) == 0); 142 ATF_REQUIRE((fd = open(FILE, O_CREAT|O_RDWR, 0644)) != -1); 143 ATF_REQUIRE(close(fd) == 0); 144 145 ATF_REQUIRE((dfd = open(DIR, O_RDONLY|O_SEARCH, 0)) != -1); 146 147 ATF_REQUIRE((fd = openat(dfd, BASEFILE, O_RDWR, 0)) != -1); 148 ATF_REQUIRE(close(fd) == 0); 149 150 ATF_REQUIRE(fchmod(dfd, 0644) == 0); 151 152 ATF_REQUIRE((fd = openat(dfd, BASEFILE, O_RDWR, 0)) != -1); 153 ATF_REQUIRE(close(fd) == 0); 154 155 ATF_REQUIRE(fchmod(dfd, 0444) == 0); 156 157 ATF_REQUIRE((fd = openat(dfd, BASEFILE, O_RDWR, 0)) != -1); 158 159 ATF_REQUIRE(close(dfd) == 0); 160 } 161 162 #endif /* USE_O_SEARCH */ 163 164 ATF_TC(o_search_perm2); 165 ATF_TC_HEAD(o_search_perm2, tc) 166 { 167 atf_tc_set_md_var(tc, "descr", "See that faccessat enforces search permission"); 168 atf_tc_set_md_var(tc, "require.user", "unprivileged"); 169 } 170 ATF_TC_BODY(o_search_perm2, tc) 171 { 172 int dfd; 173 int fd; 174 ATF_REQUIRE(mkdir(DIR, 0755) == 0); 175 ATF_REQUIRE((fd = open(FILE, O_CREAT|O_RDWR, 0644)) != -1); 176 ATF_REQUIRE(close(fd) == 0); 177 178 ATF_REQUIRE((dfd = open(DIR, O_RDONLY, 0)) != -1); 179 180 ATF_REQUIRE(faccessat(dfd, BASEFILE, W_OK, 0) == 0); 181 182 ATF_REQUIRE(fchmod(dfd, 0644) == 0); 183 184 ATF_REQUIRE(faccessat(dfd, BASEFILE, W_OK, 0) == -1); 185 ATF_REQUIRE(errno == EACCES); 186 187 ATF_REQUIRE(close(dfd) == 0); 188 } 189 190 #ifdef USE_O_SEARCH 191 192 ATF_TC(o_search_root_flag2); 193 ATF_TC_HEAD(o_search_root_flag2, tc) 194 { 195 atf_tc_set_md_var(tc, "descr", "See that root fstatat honours O_SEARCH"); 196 atf_tc_set_md_var(tc, "require.user", "root"); 197 } 198 ATF_TC_BODY(o_search_root_flag2, tc) 199 { 200 int dfd; 201 int fd; 202 203 ATF_REQUIRE(mkdir(DIR, 0755) == 0); 204 ATF_REQUIRE((fd = open(FILE, O_CREAT|O_RDWR, 0644)) != -1); 205 ATF_REQUIRE(close(fd) == 0); 206 207 ATF_REQUIRE((dfd = open(DIR, O_RDONLY|O_SEARCH, 0)) != -1); 208 209 ATF_REQUIRE(faccessat(dfd, BASEFILE, W_OK, 0) == 0); 210 211 ATF_REQUIRE(fchmod(dfd, 0644) == 0); 212 213 ATF_REQUIRE(faccessat(dfd, BASEFILE, W_OK, 0) == 0); 214 215 ATF_REQUIRE(fchmod(dfd, 0444) == 0); 216 217 ATF_REQUIRE(faccessat(dfd, BASEFILE, W_OK, 0) == 0); 218 219 ATF_REQUIRE(close(dfd) == 0); 220 } 221 222 ATF_TC(o_search_unpriv_flag2); 223 ATF_TC_HEAD(o_search_unpriv_flag2, tc) 224 { 225 atf_tc_set_md_var(tc, "descr", "See that fstatat honours O_SEARCH"); 226 atf_tc_set_md_var(tc, "require.user", "unprivileged"); 227 } 228 ATF_TC_BODY(o_search_unpriv_flag2, tc) 229 { 230 int dfd; 231 int fd; 232 233 ATF_REQUIRE(mkdir(DIR, 0755) == 0); 234 ATF_REQUIRE((fd = open(FILE, O_CREAT|O_RDWR, 0644)) != -1); 235 ATF_REQUIRE(close(fd) == 0); 236 237 ATF_REQUIRE((dfd = open(DIR, O_RDONLY|O_SEARCH, 0)) != -1); 238 239 ATF_REQUIRE(faccessat(dfd, BASEFILE, W_OK, 0) == 0); 240 241 ATF_REQUIRE(fchmod(dfd, 0644) == 0); 242 243 ATF_REQUIRE(faccessat(dfd, BASEFILE, W_OK, 0) == 0); 244 245 ATF_REQUIRE(fchmod(dfd, 0444) == 0); 246 247 ATF_REQUIRE(faccessat(dfd, BASEFILE, W_OK, 0) == 0); 248 249 ATF_REQUIRE(close(dfd) == 0); 250 } 251 252 #endif /* USE_O_SEARCH */ 253 254 255 ATF_TC(o_search_notdir); 256 ATF_TC_HEAD(o_search_notdir, tc) 257 { 258 atf_tc_set_md_var(tc, "descr", "See that openat fails with non dir fd"); 259 } 260 ATF_TC_BODY(o_search_notdir, tc) 261 { 262 int dfd; 263 int fd; 264 265 ATF_REQUIRE(mkdir(DIR, 0755) == 0); 266 ATF_REQUIRE((dfd = open(FILE, O_CREAT|O_SEARCH, 0644)) != -1); 267 ATF_REQUIRE((fd = openat(dfd, BASEFILE, O_RDWR, 0)) == -1); 268 ATF_REQUIRE(errno == ENOTDIR); 269 ATF_REQUIRE(close(dfd) == 0); 270 } 271 272 #ifdef USE_O_SEARCH 273 ATF_TC(o_search_nord); 274 ATF_TC_HEAD(o_search_nord, tc) 275 { 276 atf_tc_set_md_var(tc, "descr", "See that openat succeeds with no read permission"); 277 atf_tc_set_md_var(tc, "require.user", "unprivileged"); 278 } 279 ATF_TC_BODY(o_search_nord, tc) 280 { 281 int dfd, fd; 282 283 ATF_REQUIRE(mkdir(DIR, 0755) == 0); 284 ATF_REQUIRE((fd = open(FILE, O_CREAT|O_RDWR, 0644)) != -1); 285 ATF_REQUIRE(close(fd) == 0); 286 287 ATF_REQUIRE(chmod(DIR, 0100) == 0); 288 ATF_REQUIRE((dfd = open(DIR, O_SEARCH, 0)) != -1); 289 290 ATF_REQUIRE(faccessat(dfd, BASEFILE, W_OK, 0) != -1); 291 292 ATF_REQUIRE(close(dfd) == 0); 293 } 294 295 ATF_TC(o_search_getdents); 296 ATF_TC_HEAD(o_search_getdents, tc) 297 { 298 atf_tc_set_md_var(tc, "descr", "See that O_SEARCH forbids getdents"); 299 } 300 ATF_TC_BODY(o_search_getdents, tc) 301 { 302 char buf[1024]; 303 int dfd; 304 305 ATF_REQUIRE(mkdir(DIR, 0755) == 0); 306 ATF_REQUIRE((dfd = open(DIR, O_SEARCH, 0)) != -1); 307 ATF_REQUIRE(getdents(dfd, buf, sizeof(buf)) < 0); 308 ATF_REQUIRE(close(dfd) == 0); 309 } 310 311 ATF_TC(o_search_revokex); 312 ATF_TC_HEAD(o_search_revokex, tc) 313 { 314 atf_tc_set_md_var(tc, "descr", "See that *at behaves after chmod -x"); 315 atf_tc_set_md_var(tc, "require.user", "unprivileged"); 316 } 317 ATF_TC_BODY(o_search_revokex, tc) 318 { 319 int dfd, fd; 320 struct stat sb; 321 322 ATF_REQUIRE(mkdir(DIR, 0755) == 0); 323 ATF_REQUIRE((fd = open(FILE, O_CREAT|O_RDWR, 0644)) != -1); 324 ATF_REQUIRE(close(fd) == 0); 325 326 ATF_REQUIRE((dfd = open(DIR, O_SEARCH, 0)) != -1); 327 328 /* Drop permissions. The kernel must still not check the exec bit. */ 329 ATF_REQUIRE(chmod(DIR, 0000) == 0); 330 { 331 const char *fstypename; 332 #ifdef __FreeBSD__ 333 struct statfs st; 334 335 fstatfs(dfd, &st); 336 fstypename = st.f_fstypename; 337 #else 338 struct statvfs vst; 339 340 fstatvfs(dfd, &vst); 341 fstypename = vst.f_fstypename; 342 #endif 343 if (strcmp(fstypename, "nfs") == 0) 344 atf_tc_expect_fail( 345 "NFS protocol cannot observe O_SEARCH semantics"); 346 } 347 ATF_REQUIRE(fstatat(dfd, BASEFILE, &sb, 0) == 0); 348 349 ATF_REQUIRE(close(dfd) == 0); 350 } 351 #endif /* USE_O_SEARCH */ 352 353 ATF_TP_ADD_TCS(tp) 354 { 355 356 ATF_TP_ADD_TC(tp, o_search_perm1); 357 #ifdef USE_O_SEARCH 358 ATF_TP_ADD_TC(tp, o_search_root_flag1); 359 ATF_TP_ADD_TC(tp, o_search_unpriv_flag1); 360 #endif 361 ATF_TP_ADD_TC(tp, o_search_perm2); 362 #ifdef USE_O_SEARCH 363 ATF_TP_ADD_TC(tp, o_search_root_flag2); 364 ATF_TP_ADD_TC(tp, o_search_unpriv_flag2); 365 #endif 366 ATF_TP_ADD_TC(tp, o_search_notdir); 367 #ifdef USE_O_SEARCH 368 ATF_TP_ADD_TC(tp, o_search_nord); 369 ATF_TP_ADD_TC(tp, o_search_getdents); 370 ATF_TP_ADD_TC(tp, o_search_revokex); 371 #endif 372 373 return atf_no_error(); 374 } 375