Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sys/capsicum.h
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008-2010, 2015 Robert N. M. Watson 5 * Copyright (c) 2012 FreeBSD Foundation 6 * All rights reserved. 7 * 8 * This software was developed at the University of Cambridge Computer 9 * Laboratory with support from a grant from Google, Inc. 10 * 11 * Portions of this software were developed by Pawel Jakub Dawidek under 12 * sponsorship from the FreeBSD Foundation. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $FreeBSD: releng/12.0/sys/sys/capsicum.h 339341 2018-10-12 23:48:10Z mjg $ 36 */ 37 38 /* 39 * Definitions for FreeBSD capabilities facility. 40 */ 41 #ifndef _SYS_CAPSICUM_H_ 42 #define _SYS_CAPSICUM_H_ 43 44 #include <sys/cdefs.h> 45 #include <sys/param.h> 46 47 #include <sys/caprights.h> 48 #include <sys/file.h> 49 #include <sys/fcntl.h> 50 51 #ifndef _KERNEL 52 #include <stdbool.h> 53 #endif 54 55 #define CAPRIGHT(idx, bit) ((1ULL << (57 + (idx))) | (bit)) 56 57 /* 58 * Possible rights on capabilities. 59 * 60 * Notes: 61 * Some system calls don't require a capability in order to perform an 62 * operation on an fd. These include: close, dup, dup2. 63 * 64 * sendfile is authorized using CAP_READ on the file and CAP_WRITE on the 65 * socket. 66 * 67 * mmap() and aio*() system calls will need special attention as they may 68 * involve reads or writes depending a great deal on context. 69 */ 70 71 /* INDEX 0 */ 72 73 /* 74 * General file I/O. 75 */ 76 /* Allows for openat(O_RDONLY), read(2), readv(2). */ 77 #define CAP_READ CAPRIGHT(0, 0x0000000000000001ULL) 78 /* Allows for openat(O_WRONLY | O_APPEND), write(2), writev(2). */ 79 #define CAP_WRITE CAPRIGHT(0, 0x0000000000000002ULL) 80 /* Allows for lseek(fd, 0, SEEK_CUR). */ 81 #define CAP_SEEK_TELL CAPRIGHT(0, 0x0000000000000004ULL) 82 /* Allows for lseek(2). */ 83 #define CAP_SEEK (CAP_SEEK_TELL | 0x0000000000000008ULL) 84 /* Allows for aio_read(2), pread(2), preadv(2). */ 85 #define CAP_PREAD (CAP_SEEK | CAP_READ) 86 /* 87 * Allows for aio_write(2), openat(O_WRONLY) (without O_APPEND), pwrite(2), 88 * pwritev(2). 89 */ 90 #define CAP_PWRITE (CAP_SEEK | CAP_WRITE) 91 /* Allows for mmap(PROT_NONE). */ 92 #define CAP_MMAP CAPRIGHT(0, 0x0000000000000010ULL) 93 /* Allows for mmap(PROT_READ). */ 94 #define CAP_MMAP_R (CAP_MMAP | CAP_SEEK | CAP_READ) 95 /* Allows for mmap(PROT_WRITE). */ 96 #define CAP_MMAP_W (CAP_MMAP | CAP_SEEK | CAP_WRITE) 97 /* Allows for mmap(PROT_EXEC). */ 98 #define CAP_MMAP_X (CAP_MMAP | CAP_SEEK | 0x0000000000000020ULL) 99 /* Allows for mmap(PROT_READ | PROT_WRITE). */ 100 #define CAP_MMAP_RW (CAP_MMAP_R | CAP_MMAP_W) 101 /* Allows for mmap(PROT_READ | PROT_EXEC). */ 102 #define CAP_MMAP_RX (CAP_MMAP_R | CAP_MMAP_X) 103 /* Allows for mmap(PROT_WRITE | PROT_EXEC). */ 104 #define CAP_MMAP_WX (CAP_MMAP_W | CAP_MMAP_X) 105 /* Allows for mmap(PROT_READ | PROT_WRITE | PROT_EXEC). */ 106 #define CAP_MMAP_RWX (CAP_MMAP_R | CAP_MMAP_W | CAP_MMAP_X) 107 /* Allows for openat(O_CREAT). */ 108 #define CAP_CREATE CAPRIGHT(0, 0x0000000000000040ULL) 109 /* Allows for openat(O_EXEC) and fexecve(2) in turn. */ 110 #define CAP_FEXECVE CAPRIGHT(0, 0x0000000000000080ULL) 111 /* Allows for openat(O_SYNC), openat(O_FSYNC), fsync(2), aio_fsync(2). */ 112 #define CAP_FSYNC CAPRIGHT(0, 0x0000000000000100ULL) 113 /* Allows for openat(O_TRUNC), ftruncate(2). */ 114 #define CAP_FTRUNCATE CAPRIGHT(0, 0x0000000000000200ULL) 115 116 /* Lookups - used to constrain *at() calls. */ 117 #define CAP_LOOKUP CAPRIGHT(0, 0x0000000000000400ULL) 118 119 /* VFS methods. */ 120 /* Allows for fchdir(2). */ 121 #define CAP_FCHDIR CAPRIGHT(0, 0x0000000000000800ULL) 122 /* Allows for fchflags(2). */ 123 #define CAP_FCHFLAGS CAPRIGHT(0, 0x0000000000001000ULL) 124 /* Allows for fchflags(2) and chflagsat(2). */ 125 #define CAP_CHFLAGSAT (CAP_FCHFLAGS | CAP_LOOKUP) 126 /* Allows for fchmod(2). */ 127 #define CAP_FCHMOD CAPRIGHT(0, 0x0000000000002000ULL) 128 /* Allows for fchmod(2) and fchmodat(2). */ 129 #define CAP_FCHMODAT (CAP_FCHMOD | CAP_LOOKUP) 130 /* Allows for fchown(2). */ 131 #define CAP_FCHOWN CAPRIGHT(0, 0x0000000000004000ULL) 132 /* Allows for fchown(2) and fchownat(2). */ 133 #define CAP_FCHOWNAT (CAP_FCHOWN | CAP_LOOKUP) 134 /* Allows for fcntl(2). */ 135 #define CAP_FCNTL CAPRIGHT(0, 0x0000000000008000ULL) 136 /* 137 * Allows for flock(2), openat(O_SHLOCK), openat(O_EXLOCK), 138 * fcntl(F_SETLK_REMOTE), fcntl(F_SETLKW), fcntl(F_SETLK), fcntl(F_GETLK). 139 */ 140 #define CAP_FLOCK CAPRIGHT(0, 0x0000000000010000ULL) 141 /* Allows for fpathconf(2). */ 142 #define CAP_FPATHCONF CAPRIGHT(0, 0x0000000000020000ULL) 143 /* Allows for UFS background-fsck operations. */ 144 #define CAP_FSCK CAPRIGHT(0, 0x0000000000040000ULL) 145 /* Allows for fstat(2). */ 146 #define CAP_FSTAT CAPRIGHT(0, 0x0000000000080000ULL) 147 /* Allows for fstat(2), fstatat(2) and faccessat(2). */ 148 #define CAP_FSTATAT (CAP_FSTAT | CAP_LOOKUP) 149 /* Allows for fstatfs(2). */ 150 #define CAP_FSTATFS CAPRIGHT(0, 0x0000000000100000ULL) 151 /* Allows for futimens(2) and futimes(2). */ 152 #define CAP_FUTIMES CAPRIGHT(0, 0x0000000000200000ULL) 153 /* Allows for futimens(2), futimes(2), futimesat(2) and utimensat(2). */ 154 #define CAP_FUTIMESAT (CAP_FUTIMES | CAP_LOOKUP) 155 /* Allows for linkat(2) (target directory descriptor). */ 156 #define CAP_LINKAT_TARGET (CAP_LOOKUP | 0x0000000000400000ULL) 157 /* Allows for mkdirat(2). */ 158 #define CAP_MKDIRAT (CAP_LOOKUP | 0x0000000000800000ULL) 159 /* Allows for mkfifoat(2). */ 160 #define CAP_MKFIFOAT (CAP_LOOKUP | 0x0000000001000000ULL) 161 /* Allows for mknodat(2). */ 162 #define CAP_MKNODAT (CAP_LOOKUP | 0x0000000002000000ULL) 163 /* Allows for renameat(2) (source directory descriptor). */ 164 #define CAP_RENAMEAT_SOURCE (CAP_LOOKUP | 0x0000000004000000ULL) 165 /* Allows for symlinkat(2). */ 166 #define CAP_SYMLINKAT (CAP_LOOKUP | 0x0000000008000000ULL) 167 /* 168 * Allows for unlinkat(2) and renameat(2) if destination object exists and 169 * will be removed. 170 */ 171 #define CAP_UNLINKAT (CAP_LOOKUP | 0x0000000010000000ULL) 172 173 /* Socket operations. */ 174 /* Allows for accept(2) and accept4(2). */ 175 #define CAP_ACCEPT CAPRIGHT(0, 0x0000000020000000ULL) 176 /* Allows for bind(2). */ 177 #define CAP_BIND CAPRIGHT(0, 0x0000000040000000ULL) 178 /* Allows for connect(2). */ 179 #define CAP_CONNECT CAPRIGHT(0, 0x0000000080000000ULL) 180 /* Allows for getpeername(2). */ 181 #define CAP_GETPEERNAME CAPRIGHT(0, 0x0000000100000000ULL) 182 /* Allows for getsockname(2). */ 183 #define CAP_GETSOCKNAME CAPRIGHT(0, 0x0000000200000000ULL) 184 /* Allows for getsockopt(2). */ 185 #define CAP_GETSOCKOPT CAPRIGHT(0, 0x0000000400000000ULL) 186 /* Allows for listen(2). */ 187 #define CAP_LISTEN CAPRIGHT(0, 0x0000000800000000ULL) 188 /* Allows for sctp_peeloff(2). */ 189 #define CAP_PEELOFF CAPRIGHT(0, 0x0000001000000000ULL) 190 #define CAP_RECV CAP_READ 191 #define CAP_SEND CAP_WRITE 192 /* Allows for setsockopt(2). */ 193 #define CAP_SETSOCKOPT CAPRIGHT(0, 0x0000002000000000ULL) 194 /* Allows for shutdown(2). */ 195 #define CAP_SHUTDOWN CAPRIGHT(0, 0x0000004000000000ULL) 196 197 /* Allows for bindat(2) on a directory descriptor. */ 198 #define CAP_BINDAT (CAP_LOOKUP | 0x0000008000000000ULL) 199 /* Allows for connectat(2) on a directory descriptor. */ 200 #define CAP_CONNECTAT (CAP_LOOKUP | 0x0000010000000000ULL) 201 202 /* Allows for linkat(2) (source directory descriptor). */ 203 #define CAP_LINKAT_SOURCE (CAP_LOOKUP | 0x0000020000000000ULL) 204 /* Allows for renameat(2) (target directory descriptor). */ 205 #define CAP_RENAMEAT_TARGET (CAP_LOOKUP | 0x0000040000000000ULL) 206 207 #define CAP_SOCK_CLIENT \ 208 (CAP_CONNECT | CAP_GETPEERNAME | CAP_GETSOCKNAME | CAP_GETSOCKOPT | \ 209 CAP_PEELOFF | CAP_RECV | CAP_SEND | CAP_SETSOCKOPT | CAP_SHUTDOWN) 210 #define CAP_SOCK_SERVER \ 211 (CAP_ACCEPT | CAP_BIND | CAP_GETPEERNAME | CAP_GETSOCKNAME | \ 212 CAP_GETSOCKOPT | CAP_LISTEN | CAP_PEELOFF | CAP_RECV | CAP_SEND | \ 213 CAP_SETSOCKOPT | CAP_SHUTDOWN) 214 215 /* All used bits for index 0. */ 216 #define CAP_ALL0 CAPRIGHT(0, 0x000007FFFFFFFFFFULL) 217 218 /* Available bits for index 0. */ 219 #define CAP_UNUSED0_44 CAPRIGHT(0, 0x0000080000000000ULL) 220 /* ... */ 221 #define CAP_UNUSED0_57 CAPRIGHT(0, 0x0100000000000000ULL) 222 223 /* INDEX 1 */ 224 225 /* Mandatory Access Control. */ 226 /* Allows for mac_get_fd(3). */ 227 #define CAP_MAC_GET CAPRIGHT(1, 0x0000000000000001ULL) 228 /* Allows for mac_set_fd(3). */ 229 #define CAP_MAC_SET CAPRIGHT(1, 0x0000000000000002ULL) 230 231 /* Methods on semaphores. */ 232 #define CAP_SEM_GETVALUE CAPRIGHT(1, 0x0000000000000004ULL) 233 #define CAP_SEM_POST CAPRIGHT(1, 0x0000000000000008ULL) 234 #define CAP_SEM_WAIT CAPRIGHT(1, 0x0000000000000010ULL) 235 236 /* Allows select(2) and poll(2) on descriptor. */ 237 #define CAP_EVENT CAPRIGHT(1, 0x0000000000000020ULL) 238 /* Allows for kevent(2) on kqueue descriptor with eventlist != NULL. */ 239 #define CAP_KQUEUE_EVENT CAPRIGHT(1, 0x0000000000000040ULL) 240 241 /* Strange and powerful rights that should not be given lightly. */ 242 /* Allows for ioctl(2). */ 243 #define CAP_IOCTL CAPRIGHT(1, 0x0000000000000080ULL) 244 #define CAP_TTYHOOK CAPRIGHT(1, 0x0000000000000100ULL) 245 246 /* Process management via process descriptors. */ 247 /* Allows for pdgetpid(2). */ 248 #define CAP_PDGETPID CAPRIGHT(1, 0x0000000000000200ULL) 249 /* Allows for pdwait4(2). */ 250 #define CAP_PDWAIT CAPRIGHT(1, 0x0000000000000400ULL) 251 /* Allows for pdkill(2). */ 252 #define CAP_PDKILL CAPRIGHT(1, 0x0000000000000800ULL) 253 254 /* Extended attributes. */ 255 /* Allows for extattr_delete_fd(2). */ 256 #define CAP_EXTATTR_DELETE CAPRIGHT(1, 0x0000000000001000ULL) 257 /* Allows for extattr_get_fd(2). */ 258 #define CAP_EXTATTR_GET CAPRIGHT(1, 0x0000000000002000ULL) 259 /* Allows for extattr_list_fd(2). */ 260 #define CAP_EXTATTR_LIST CAPRIGHT(1, 0x0000000000004000ULL) 261 /* Allows for extattr_set_fd(2). */ 262 #define CAP_EXTATTR_SET CAPRIGHT(1, 0x0000000000008000ULL) 263 264 /* Access Control Lists. */ 265 /* Allows for acl_valid_fd_np(3). */ 266 #define CAP_ACL_CHECK CAPRIGHT(1, 0x0000000000010000ULL) 267 /* Allows for acl_delete_fd_np(3). */ 268 #define CAP_ACL_DELETE CAPRIGHT(1, 0x0000000000020000ULL) 269 /* Allows for acl_get_fd(3) and acl_get_fd_np(3). */ 270 #define CAP_ACL_GET CAPRIGHT(1, 0x0000000000040000ULL) 271 /* Allows for acl_set_fd(3) and acl_set_fd_np(3). */ 272 #define CAP_ACL_SET CAPRIGHT(1, 0x0000000000080000ULL) 273 274 /* Allows for kevent(2) on kqueue descriptor with changelist != NULL. */ 275 #define CAP_KQUEUE_CHANGE CAPRIGHT(1, 0x0000000000100000ULL) 276 277 #define CAP_KQUEUE (CAP_KQUEUE_EVENT | CAP_KQUEUE_CHANGE) 278 279 /* All used bits for index 1. */ 280 #define CAP_ALL1 CAPRIGHT(1, 0x00000000001FFFFFULL) 281 282 /* Available bits for index 1. */ 283 #define CAP_UNUSED1_22 CAPRIGHT(1, 0x0000000000200000ULL) 284 /* ... */ 285 #define CAP_UNUSED1_57 CAPRIGHT(1, 0x0100000000000000ULL) 286 287 /* Backward compatibility. */ 288 #define CAP_POLL_EVENT CAP_EVENT 289 290 #define CAP_ALL(rights) do { \ 291 (rights)->cr_rights[0] = \ 292 ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAP_ALL0; \ 293 (rights)->cr_rights[1] = CAP_ALL1; \ 294 } while (0) 295 296 #define CAP_NONE(rights) do { \ 297 (rights)->cr_rights[0] = \ 298 ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAPRIGHT(0, 0ULL); \ 299 (rights)->cr_rights[1] = CAPRIGHT(1, 0ULL); \ 300 } while (0) 301 302 #define CAPRVER(right) ((int)((right) >> 62)) 303 #define CAPVER(rights) CAPRVER((rights)->cr_rights[0]) 304 #define CAPARSIZE(rights) (CAPVER(rights) + 2) 305 #define CAPIDXBIT(right) ((int)(((right) >> 57) & 0x1F)) 306 307 /* 308 * Allowed fcntl(2) commands. 309 */ 310 #define CAP_FCNTL_GETFL (1 << F_GETFL) 311 #define CAP_FCNTL_SETFL (1 << F_SETFL) 312 #define CAP_FCNTL_GETOWN (1 << F_GETOWN) 313 #define CAP_FCNTL_SETOWN (1 << F_SETOWN) 314 #define CAP_FCNTL_ALL (CAP_FCNTL_GETFL | CAP_FCNTL_SETFL | \ 315 CAP_FCNTL_GETOWN | CAP_FCNTL_SETOWN) 316 317 #define CAP_IOCTLS_ALL SSIZE_MAX 318 319 __BEGIN_DECLS 320 321 #define cap_rights_init(...) \ 322 __cap_rights_init(CAP_RIGHTS_VERSION, __VA_ARGS__, 0ULL) 323 cap_rights_t *__cap_rights_init(int version, cap_rights_t *rights, ...); 324 325 #define cap_rights_set(...) \ 326 __cap_rights_set(__VA_ARGS__, 0ULL) 327 cap_rights_t *__cap_rights_set(cap_rights_t *rights, ...); 328 329 #define cap_rights_clear(...) \ 330 __cap_rights_clear(__VA_ARGS__, 0ULL) 331 cap_rights_t *__cap_rights_clear(cap_rights_t *rights, ...); 332 333 #define cap_rights_is_set(...) \ 334 __cap_rights_is_set(__VA_ARGS__, 0ULL) 335 bool __cap_rights_is_set(const cap_rights_t *rights, ...); 336 337 bool cap_rights_is_valid(const cap_rights_t *rights); 338 cap_rights_t *cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src); 339 cap_rights_t *cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src); 340 bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little); 341 void __cap_rights_sysinit(void *arg); 342 343 __END_DECLS 344 struct cap_rights_init_args { 345 cap_rights_t *cria_rights; 346 uint64_t cria_value1; 347 uint64_t cria_value2; 348 uint64_t cria_value3; 349 uint64_t cria_value4; 350 uint64_t cria_value5; 351 }; 352 353 #define CAP_RIGHTS_SYSINIT0(name, rights) \ 354 static struct cap_rights_init_args name##_args = { \ 355 &(rights) \ 356 }; \ 357 SYSINIT(name##_cap_rights_sysinit, SI_SUB_COPYRIGHT+1, SI_ORDER_ANY, \ 358 __cap_rights_sysinit, &name##_args); 359 360 #define CAP_RIGHTS_SYSINIT1(name, rights, value1) \ 361 static struct cap_rights_init_args name##_args = { \ 362 &(rights), \ 363 (value1) \ 364 }; \ 365 SYSINIT(name##_cap_rights_sysinit, SI_SUB_COPYRIGHT+1, SI_ORDER_ANY, \ 366 __cap_rights_sysinit, &name##_args); 367 368 #define CAP_RIGHTS_SYSINIT2(name, rights, value1, value2) \ 369 static struct cap_rights_init_args name##_args = { \ 370 &(rights), \ 371 (value1), \ 372 (value2) \ 373 }; \ 374 SYSINIT(name##_cap_rights_sysinit, SI_SUB_COPYRIGHT, SI_ORDER_ANY, \ 375 __cap_rights_sysinit, &name##_args); 376 377 #define CAP_RIGHTS_SYSINIT3(name, rights, value1, value2, value3) \ 378 static struct cap_rights_init_args name##_args = { \ 379 &(rights), \ 380 (value1), \ 381 (value2), \ 382 (value3) \ 383 }; \ 384 SYSINIT(name##_cap_rights_sysinit, SI_SUB_COPYRIGHT, SI_ORDER_ANY, \ 385 __cap_rights_sysinit, &name##_args); 386 387 #define CAP_RIGHTS_SYSINIT4(name, rights, value1, value2, value3, value4) \ 388 static struct cap_rights_init_args name##_args = { \ 389 &(rights), \ 390 (value1), \ 391 (value2), \ 392 (value3), \ 393 (value4) \ 394 }; \ 395 SYSINIT(name##_cap_rights_sysinit, SI_SUB_COPYRIGHT, SI_ORDER_ANY, \ 396 __cap_rights_sysinit, &name##_args); 397 398 #define CAP_RIGHTS_DEFINE1(name, value) \ 399 __read_mostly cap_rights_t name; \ 400 CAP_RIGHTS_SYSINIT1(name, name, value); 401 402 #ifdef _KERNEL 403 404 #include <sys/systm.h> 405 extern cap_rights_t cap_accept_rights; 406 extern cap_rights_t cap_bind_rights; 407 extern cap_rights_t cap_connect_rights; 408 extern cap_rights_t cap_event_rights; 409 extern cap_rights_t cap_fchdir_rights; 410 extern cap_rights_t cap_fchflags_rights; 411 extern cap_rights_t cap_fchmod_rights; 412 extern cap_rights_t cap_fchown_rights; 413 extern cap_rights_t cap_fcntl_rights; 414 extern cap_rights_t cap_fexecve_rights; 415 extern cap_rights_t cap_flock_rights; 416 extern cap_rights_t cap_fpathconf_rights; 417 extern cap_rights_t cap_fstat_rights; 418 extern cap_rights_t cap_fstatfs_rights; 419 extern cap_rights_t cap_fsync_rights; 420 extern cap_rights_t cap_ftruncate_rights; 421 extern cap_rights_t cap_futimes_rights; 422 extern cap_rights_t cap_getpeername_rights; 423 extern cap_rights_t cap_getsockopt_rights; 424 extern cap_rights_t cap_getsockname_rights; 425 extern cap_rights_t cap_ioctl_rights; 426 extern cap_rights_t cap_linkat_source_rights; 427 extern cap_rights_t cap_linkat_target_rights; 428 extern cap_rights_t cap_listen_rights; 429 extern cap_rights_t cap_mkdirat_rights; 430 extern cap_rights_t cap_mkfifoat_rights; 431 extern cap_rights_t cap_mknodat_rights; 432 extern cap_rights_t cap_mmap_rights; 433 extern cap_rights_t cap_no_rights; 434 extern cap_rights_t cap_pdgetpid_rights; 435 extern cap_rights_t cap_pdkill_rights; 436 extern cap_rights_t cap_pread_rights; 437 extern cap_rights_t cap_pwrite_rights; 438 extern cap_rights_t cap_read_rights; 439 extern cap_rights_t cap_recv_rights; 440 extern cap_rights_t cap_renameat_source_rights; 441 extern cap_rights_t cap_renameat_target_rights; 442 extern cap_rights_t cap_seek_rights; 443 extern cap_rights_t cap_send_rights; 444 extern cap_rights_t cap_send_connect_rights; 445 extern cap_rights_t cap_setsockopt_rights; 446 extern cap_rights_t cap_shutdown_rights; 447 extern cap_rights_t cap_symlinkat_rights; 448 extern cap_rights_t cap_unlinkat_rights; 449 extern cap_rights_t cap_write_rights; 450 451 #define IN_CAPABILITY_MODE(td) (((td)->td_ucred->cr_flags & CRED_FLAG_CAPMODE) != 0) 452 453 struct filedesc; 454 struct filedescent; 455 456 /* 457 * Test whether a capability grants the requested rights. 458 */ 459 int cap_check(const cap_rights_t *havep, const cap_rights_t *needp); 460 /* 461 * Convert capability rights into VM access flags. 462 */ 463 u_char cap_rights_to_vmprot(const cap_rights_t *havep); 464 465 /* 466 * For the purposes of procstat(1) and similar tools, allow kern_descrip.c to 467 * extract the rights from a capability. 468 * 469 * Dereferencing fdep requires filedesc.h, but including it would cause 470 * significant pollution. Instead add a macro for consumers which want it, 471 * most notably kern_descrip.c. 472 */ 473 #define cap_rights_fde_inline(fdep) (&(fdep)->fde_rights) 474 475 const cap_rights_t *cap_rights_fde(const struct filedescent *fde); 476 const cap_rights_t *cap_rights(struct filedesc *fdp, int fd); 477 478 int cap_ioctl_check(struct filedesc *fdp, int fd, u_long cmd); 479 int cap_fcntl_check_fde(struct filedescent *fde, int cmd); 480 int cap_fcntl_check(struct filedesc *fdp, int fd, int cmd); 481 482 extern bool trap_enotcap; 483 484 #else /* !_KERNEL */ 485 486 __BEGIN_DECLS 487 /* 488 * cap_enter(): Cause the process to enter capability mode, which will 489 * prevent it from directly accessing global namespaces. System calls will 490 * be limited to process-local, process-inherited, or file descriptor 491 * operations. If already in capability mode, a no-op. 492 */ 493 int cap_enter(void); 494 495 /* 496 * Are we sandboxed (in capability mode)? 497 * This is a libc wrapper around the cap_getmode(2) system call. 498 */ 499 bool cap_sandboxed(void); 500 501 /* 502 * cap_getmode(): Are we in capability mode? 503 */ 504 int cap_getmode(u_int *modep); 505 506 /* 507 * Limits capability rights for the given descriptor (CAP_*). 508 */ 509 int cap_rights_limit(int fd, const cap_rights_t *rights); 510 /* 511 * Returns capability rights for the given descriptor. 512 */ 513 #define cap_rights_get(fd, rights) \ 514 __cap_rights_get(CAP_RIGHTS_VERSION, (fd), (rights)) 515 int __cap_rights_get(int version, int fd, cap_rights_t *rights); 516 /* 517 * Limits allowed ioctls for the given descriptor. 518 */ 519 int cap_ioctls_limit(int fd, const cap_ioctl_t *cmds, size_t ncmds); 520 /* 521 * Returns array of allowed ioctls for the given descriptor. 522 * If all ioctls are allowed, the cmds array is not populated and 523 * the function returns CAP_IOCTLS_ALL. 524 */ 525 ssize_t cap_ioctls_get(int fd, cap_ioctl_t *cmds, size_t maxcmds); 526 /* 527 * Limits allowed fcntls for the given descriptor (CAP_FCNTL_*). 528 */ 529 int cap_fcntls_limit(int fd, uint32_t fcntlrights); 530 /* 531 * Returns bitmask of allowed fcntls for the given descriptor. 532 */ 533 int cap_fcntls_get(int fd, uint32_t *fcntlrightsp); 534 535 __END_DECLS 536 537 #endif /* !_KERNEL */ 538 539 #endif /* !_SYS_CAPSICUM_H_ */
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