1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 * $FreeBSD$ 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 /* 250 * Allows for pdwait4(2). 251 * 252 * XXX: this constant was imported unused, but is targeted to be implemented 253 * in the future (bug 235871). 254 */ 255 #define CAP_PDWAIT CAPRIGHT(1, 0x0000000000000400ULL) 256 /* Allows for pdkill(2). */ 257 #define CAP_PDKILL CAPRIGHT(1, 0x0000000000000800ULL) 258 259 /* Extended attributes. */ 260 /* Allows for extattr_delete_fd(2). */ 261 #define CAP_EXTATTR_DELETE CAPRIGHT(1, 0x0000000000001000ULL) 262 /* Allows for extattr_get_fd(2). */ 263 #define CAP_EXTATTR_GET CAPRIGHT(1, 0x0000000000002000ULL) 264 /* Allows for extattr_list_fd(2). */ 265 #define CAP_EXTATTR_LIST CAPRIGHT(1, 0x0000000000004000ULL) 266 /* Allows for extattr_set_fd(2). */ 267 #define CAP_EXTATTR_SET CAPRIGHT(1, 0x0000000000008000ULL) 268 269 /* Access Control Lists. */ 270 /* Allows for acl_valid_fd_np(3). */ 271 #define CAP_ACL_CHECK CAPRIGHT(1, 0x0000000000010000ULL) 272 /* Allows for acl_delete_fd_np(3). */ 273 #define CAP_ACL_DELETE CAPRIGHT(1, 0x0000000000020000ULL) 274 /* Allows for acl_get_fd(3) and acl_get_fd_np(3). */ 275 #define CAP_ACL_GET CAPRIGHT(1, 0x0000000000040000ULL) 276 /* Allows for acl_set_fd(3) and acl_set_fd_np(3). */ 277 #define CAP_ACL_SET CAPRIGHT(1, 0x0000000000080000ULL) 278 279 /* Allows for kevent(2) on kqueue descriptor with changelist != NULL. */ 280 #define CAP_KQUEUE_CHANGE CAPRIGHT(1, 0x0000000000100000ULL) 281 282 #define CAP_KQUEUE (CAP_KQUEUE_EVENT | CAP_KQUEUE_CHANGE) 283 284 /* All used bits for index 1. */ 285 #define CAP_ALL1 CAPRIGHT(1, 0x00000000001FFFFFULL) 286 287 /* Available bits for index 1. */ 288 #define CAP_UNUSED1_22 CAPRIGHT(1, 0x0000000000200000ULL) 289 /* ... */ 290 #define CAP_UNUSED1_57 CAPRIGHT(1, 0x0100000000000000ULL) 291 292 /* Backward compatibility. */ 293 #define CAP_POLL_EVENT CAP_EVENT 294 295 #define CAP_ALL(rights) do { \ 296 (rights)->cr_rights[0] = \ 297 ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAP_ALL0; \ 298 (rights)->cr_rights[1] = CAP_ALL1; \ 299 } while (0) 300 301 #define CAP_NONE(rights) do { \ 302 (rights)->cr_rights[0] = \ 303 ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAPRIGHT(0, 0ULL); \ 304 (rights)->cr_rights[1] = CAPRIGHT(1, 0ULL); \ 305 } while (0) 306 307 #define CAPRVER(right) ((int)((right) >> 62)) 308 #define CAPVER(rights) CAPRVER((rights)->cr_rights[0]) 309 #define CAPARSIZE(rights) (CAPVER(rights) + 2) 310 #define CAPIDXBIT(right) ((int)(((right) >> 57) & 0x1F)) 311 312 /* 313 * Allowed fcntl(2) commands. 314 */ 315 #define CAP_FCNTL_GETFL (1 << F_GETFL) 316 #define CAP_FCNTL_SETFL (1 << F_SETFL) 317 #define CAP_FCNTL_GETOWN (1 << F_GETOWN) 318 #define CAP_FCNTL_SETOWN (1 << F_SETOWN) 319 #define CAP_FCNTL_ALL (CAP_FCNTL_GETFL | CAP_FCNTL_SETFL | \ 320 CAP_FCNTL_GETOWN | CAP_FCNTL_SETOWN) 321 322 #define CAP_IOCTLS_ALL SSIZE_MAX 323 324 __BEGIN_DECLS 325 326 #define cap_rights_init(...) \ 327 __cap_rights_init(CAP_RIGHTS_VERSION, __VA_ARGS__, 0ULL) 328 cap_rights_t *__cap_rights_init(int version, cap_rights_t *rights, ...); 329 330 #define cap_rights_set(...) \ 331 __cap_rights_set(__VA_ARGS__, 0ULL) 332 cap_rights_t *__cap_rights_set(cap_rights_t *rights, ...); 333 334 #define cap_rights_clear(...) \ 335 __cap_rights_clear(__VA_ARGS__, 0ULL) 336 cap_rights_t *__cap_rights_clear(cap_rights_t *rights, ...); 337 338 #define cap_rights_is_set(...) \ 339 __cap_rights_is_set(__VA_ARGS__, 0ULL) 340 bool __cap_rights_is_set(const cap_rights_t *rights, ...); 341 342 bool cap_rights_is_valid(const cap_rights_t *rights); 343 cap_rights_t *cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src); 344 cap_rights_t *cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src); 345 346 #ifdef _KERNEL 347 /* 348 * We only support one size to reduce branching. 349 */ 350 _Static_assert(CAP_RIGHTS_VERSION == CAP_RIGHTS_VERSION_00, 351 "unsupported version of capsicum rights"); 352 353 #define cap_rights_init_zero(r) ({ \ 354 cap_rights_t *_r = (r); \ 355 CAP_NONE(_r); \ 356 _r; \ 357 }) 358 359 #define cap_rights_init_one(r, right) ({ \ 360 CTASSERT(CAPRVER(right) == CAP_RIGHTS_VERSION); \ 361 cap_rights_t *_r = (r); \ 362 CAP_NONE(_r); \ 363 _r->cr_rights[CAPIDXBIT(right) - 1] |= right; \ 364 _r; \ 365 }) 366 367 #define cap_rights_set_one(r, right) ({ \ 368 CTASSERT(CAPRVER(right) == CAP_RIGHTS_VERSION); \ 369 cap_rights_t *_r = (r); \ 370 _r->cr_rights[CAPIDXBIT(right) - 1] |= right; \ 371 _r; \ 372 }) 373 374 /* 375 * Allow checking caps which are possibly getting modified at the same time. 376 * The caller is expected to determine whether the result is legitimate via 377 * other means, see fget_unlocked for an example. 378 */ 379 380 static inline bool 381 cap_rights_contains_transient(const cap_rights_t *big, const cap_rights_t *little) 382 { 383 384 if (__predict_true( 385 (big->cr_rights[0] & little->cr_rights[0]) == little->cr_rights[0] && 386 (big->cr_rights[1] & little->cr_rights[1]) == little->cr_rights[1])) 387 return (true); 388 return (false); 389 } 390 391 #define cap_rights_contains cap_rights_contains_transient 392 393 int cap_check_failed_notcapable(const cap_rights_t *havep, 394 const cap_rights_t *needp); 395 396 static inline int 397 cap_check_inline(const cap_rights_t *havep, const cap_rights_t *needp) 398 { 399 400 if (__predict_false(!cap_rights_contains(havep, needp))) 401 return (cap_check_failed_notcapable(havep, needp)); 402 return (0); 403 } 404 405 static inline int 406 cap_check_inline_transient(const cap_rights_t *havep, const cap_rights_t *needp) 407 { 408 409 if (__predict_false(!cap_rights_contains(havep, needp))) 410 return (1); 411 return (0); 412 } 413 #else 414 bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little); 415 #endif 416 417 __END_DECLS 418 419 #ifdef _KERNEL 420 421 #include <sys/systm.h> 422 423 #define IN_CAPABILITY_MODE(td) (((td)->td_ucred->cr_flags & CRED_FLAG_CAPMODE) != 0) 424 425 struct filedesc; 426 struct filedescent; 427 428 /* 429 * Test whether a capability grants the requested rights. 430 */ 431 int cap_check(const cap_rights_t *havep, const cap_rights_t *needp); 432 /* 433 * Convert capability rights into VM access flags. 434 */ 435 vm_prot_t cap_rights_to_vmprot(const cap_rights_t *havep); 436 437 /* 438 * For the purposes of procstat(1) and similar tools, allow kern_descrip.c to 439 * extract the rights from a capability. 440 * 441 * Dereferencing fdep requires filedesc.h, but including it would cause 442 * significant pollution. Instead add a macro for consumers which want it, 443 * most notably kern_descrip.c. 444 */ 445 #define cap_rights_fde_inline(fdep) (&(fdep)->fde_rights) 446 447 const cap_rights_t *cap_rights_fde(const struct filedescent *fde); 448 const cap_rights_t *cap_rights(struct filedesc *fdp, int fd); 449 450 int cap_ioctl_check(struct filedesc *fdp, int fd, u_long cmd); 451 int cap_fcntl_check_fde(struct filedescent *fde, int cmd); 452 int cap_fcntl_check(struct filedesc *fdp, int fd, int cmd); 453 454 extern bool trap_enotcap; 455 456 #else /* !_KERNEL */ 457 458 __BEGIN_DECLS 459 /* 460 * cap_enter(): Cause the process to enter capability mode, which will 461 * prevent it from directly accessing global namespaces. System calls will 462 * be limited to process-local, process-inherited, or file descriptor 463 * operations. If already in capability mode, a no-op. 464 */ 465 int cap_enter(void); 466 467 /* 468 * Are we sandboxed (in capability mode)? 469 * This is a libc wrapper around the cap_getmode(2) system call. 470 */ 471 bool cap_sandboxed(void); 472 473 /* 474 * cap_getmode(): Are we in capability mode? 475 */ 476 int cap_getmode(u_int *modep); 477 478 /* 479 * Limits capability rights for the given descriptor (CAP_*). 480 */ 481 int cap_rights_limit(int fd, const cap_rights_t *rights); 482 /* 483 * Returns capability rights for the given descriptor. 484 */ 485 #define cap_rights_get(fd, rights) \ 486 __cap_rights_get(CAP_RIGHTS_VERSION, (fd), (rights)) 487 int __cap_rights_get(int version, int fd, cap_rights_t *rights); 488 /* 489 * Limits allowed ioctls for the given descriptor. 490 */ 491 int cap_ioctls_limit(int fd, const cap_ioctl_t *cmds, size_t ncmds); 492 /* 493 * Returns array of allowed ioctls for the given descriptor. 494 * If all ioctls are allowed, the cmds array is not populated and 495 * the function returns CAP_IOCTLS_ALL. 496 */ 497 ssize_t cap_ioctls_get(int fd, cap_ioctl_t *cmds, size_t maxcmds); 498 /* 499 * Limits allowed fcntls for the given descriptor (CAP_FCNTL_*). 500 */ 501 int cap_fcntls_limit(int fd, uint32_t fcntlrights); 502 /* 503 * Returns bitmask of allowed fcntls for the given descriptor. 504 */ 505 int cap_fcntls_get(int fd, uint32_t *fcntlrightsp); 506 507 __END_DECLS 508 509 #endif /* !_KERNEL */ 510 511 #endif /* !_SYS_CAPSICUM_H_ */ 512