2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2008-2010, 2015 Robert N. M. Watson
5 * Copyright (c) 2012 FreeBSD Foundation
8 * This software was developed at the University of Cambridge Computer
9 * Laboratory with support from a grant from Google, Inc.
11 * Portions of this software were developed by Pawel Jakub Dawidek under
12 * sponsorship from the FreeBSD Foundation.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
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.
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
37 * Definitions for FreeBSD capabilities facility.
39 #ifndef _SYS_CAPSICUM_H_
40 #define _SYS_CAPSICUM_H_
42 #include <sys/cdefs.h>
43 #include <sys/param.h>
45 #include <sys/caprights.h>
47 #include <sys/fcntl.h>
53 #define CAPRIGHT(idx, bit) ((1ULL << (57 + (idx))) | (bit))
56 * Possible rights on capabilities.
59 * Some system calls don't require a capability in order to perform an
60 * operation on an fd. These include: close, dup, dup2.
62 * sendfile is authorized using CAP_READ on the file and CAP_WRITE on the
65 * mmap() and aio*() system calls will need special attention as they may
66 * involve reads or writes depending a great deal on context.
74 /* Allows for openat(O_RDONLY), read(2), readv(2). */
75 #define CAP_READ CAPRIGHT(0, 0x0000000000000001ULL)
76 /* Allows for openat(O_WRONLY | O_APPEND), write(2), writev(2). */
77 #define CAP_WRITE CAPRIGHT(0, 0x0000000000000002ULL)
78 /* Allows for lseek(fd, 0, SEEK_CUR). */
79 #define CAP_SEEK_TELL CAPRIGHT(0, 0x0000000000000004ULL)
80 /* Allows for lseek(2). */
81 #define CAP_SEEK (CAP_SEEK_TELL | 0x0000000000000008ULL)
82 /* Allows for aio_read(2), pread(2), preadv(2). */
83 #define CAP_PREAD (CAP_SEEK | CAP_READ)
85 * Allows for aio_write(2), openat(O_WRONLY) (without O_APPEND), pwrite(2),
88 #define CAP_PWRITE (CAP_SEEK | CAP_WRITE)
89 /* Allows for mmap(PROT_NONE). */
90 #define CAP_MMAP CAPRIGHT(0, 0x0000000000000010ULL)
91 /* Allows for mmap(PROT_READ). */
92 #define CAP_MMAP_R (CAP_MMAP | CAP_SEEK | CAP_READ)
93 /* Allows for mmap(PROT_WRITE). */
94 #define CAP_MMAP_W (CAP_MMAP | CAP_SEEK | CAP_WRITE)
95 /* Allows for mmap(PROT_EXEC). */
96 #define CAP_MMAP_X (CAP_MMAP | CAP_SEEK | 0x0000000000000020ULL)
97 /* Allows for mmap(PROT_READ | PROT_WRITE). */
98 #define CAP_MMAP_RW (CAP_MMAP_R | CAP_MMAP_W)
99 /* Allows for mmap(PROT_READ | PROT_EXEC). */
100 #define CAP_MMAP_RX (CAP_MMAP_R | CAP_MMAP_X)
101 /* Allows for mmap(PROT_WRITE | PROT_EXEC). */
102 #define CAP_MMAP_WX (CAP_MMAP_W | CAP_MMAP_X)
103 /* Allows for mmap(PROT_READ | PROT_WRITE | PROT_EXEC). */
104 #define CAP_MMAP_RWX (CAP_MMAP_R | CAP_MMAP_W | CAP_MMAP_X)
105 /* Allows for openat(O_CREAT). */
106 #define CAP_CREATE CAPRIGHT(0, 0x0000000000000040ULL)
107 /* Allows for openat(O_EXEC) and fexecve(2) in turn. */
108 #define CAP_FEXECVE CAPRIGHT(0, 0x0000000000000080ULL)
109 /* Allows for openat(O_SYNC), openat(O_FSYNC), fsync(2), aio_fsync(2). */
110 #define CAP_FSYNC CAPRIGHT(0, 0x0000000000000100ULL)
111 /* Allows for openat(O_TRUNC), ftruncate(2). */
112 #define CAP_FTRUNCATE CAPRIGHT(0, 0x0000000000000200ULL)
114 /* Lookups - used to constrain *at() calls. */
115 #define CAP_LOOKUP CAPRIGHT(0, 0x0000000000000400ULL)
118 /* Allows for fchdir(2). */
119 #define CAP_FCHDIR CAPRIGHT(0, 0x0000000000000800ULL)
120 /* Allows for fchflags(2). */
121 #define CAP_FCHFLAGS CAPRIGHT(0, 0x0000000000001000ULL)
122 /* Allows for fchflags(2) and chflagsat(2). */
123 #define CAP_CHFLAGSAT (CAP_FCHFLAGS | CAP_LOOKUP)
124 /* Allows for fchmod(2). */
125 #define CAP_FCHMOD CAPRIGHT(0, 0x0000000000002000ULL)
126 /* Allows for fchmod(2) and fchmodat(2). */
127 #define CAP_FCHMODAT (CAP_FCHMOD | CAP_LOOKUP)
128 /* Allows for fchown(2). */
129 #define CAP_FCHOWN CAPRIGHT(0, 0x0000000000004000ULL)
130 /* Allows for fchown(2) and fchownat(2). */
131 #define CAP_FCHOWNAT (CAP_FCHOWN | CAP_LOOKUP)
132 /* Allows for fcntl(2). */
133 #define CAP_FCNTL CAPRIGHT(0, 0x0000000000008000ULL)
135 * Allows for flock(2), openat(O_SHLOCK), openat(O_EXLOCK),
136 * fcntl(F_SETLK_REMOTE), fcntl(F_SETLKW), fcntl(F_SETLK), fcntl(F_GETLK).
138 #define CAP_FLOCK CAPRIGHT(0, 0x0000000000010000ULL)
139 /* Allows for fpathconf(2). */
140 #define CAP_FPATHCONF CAPRIGHT(0, 0x0000000000020000ULL)
141 /* Allows for UFS background-fsck operations. */
142 #define CAP_FSCK CAPRIGHT(0, 0x0000000000040000ULL)
143 /* Allows for fstat(2). */
144 #define CAP_FSTAT CAPRIGHT(0, 0x0000000000080000ULL)
145 /* Allows for fstat(2), fstatat(2) and faccessat(2). */
146 #define CAP_FSTATAT (CAP_FSTAT | CAP_LOOKUP)
147 /* Allows for fstatfs(2). */
148 #define CAP_FSTATFS CAPRIGHT(0, 0x0000000000100000ULL)
149 /* Allows for futimens(2) and futimes(2). */
150 #define CAP_FUTIMES CAPRIGHT(0, 0x0000000000200000ULL)
151 /* Allows for futimens(2), futimes(2), futimesat(2) and utimensat(2). */
152 #define CAP_FUTIMESAT (CAP_FUTIMES | CAP_LOOKUP)
153 /* Allows for linkat(2) (target directory descriptor). */
154 #define CAP_LINKAT_TARGET (CAP_LOOKUP | 0x0000000000400000ULL)
155 /* Allows for mkdirat(2). */
156 #define CAP_MKDIRAT (CAP_LOOKUP | 0x0000000000800000ULL)
157 /* Allows for mkfifoat(2). */
158 #define CAP_MKFIFOAT (CAP_LOOKUP | 0x0000000001000000ULL)
159 /* Allows for mknodat(2). */
160 #define CAP_MKNODAT (CAP_LOOKUP | 0x0000000002000000ULL)
161 /* Allows for renameat(2) (source directory descriptor). */
162 #define CAP_RENAMEAT_SOURCE (CAP_LOOKUP | 0x0000000004000000ULL)
163 /* Allows for symlinkat(2). */
164 #define CAP_SYMLINKAT (CAP_LOOKUP | 0x0000000008000000ULL)
166 * Allows for unlinkat(2) and renameat(2) if destination object exists and
169 #define CAP_UNLINKAT (CAP_LOOKUP | 0x0000000010000000ULL)
171 /* Socket operations. */
172 /* Allows for accept(2) and accept4(2). */
173 #define CAP_ACCEPT CAPRIGHT(0, 0x0000000020000000ULL)
174 /* Allows for bind(2). */
175 #define CAP_BIND CAPRIGHT(0, 0x0000000040000000ULL)
176 /* Allows for connect(2). */
177 #define CAP_CONNECT CAPRIGHT(0, 0x0000000080000000ULL)
178 /* Allows for getpeername(2). */
179 #define CAP_GETPEERNAME CAPRIGHT(0, 0x0000000100000000ULL)
180 /* Allows for getsockname(2). */
181 #define CAP_GETSOCKNAME CAPRIGHT(0, 0x0000000200000000ULL)
182 /* Allows for getsockopt(2). */
183 #define CAP_GETSOCKOPT CAPRIGHT(0, 0x0000000400000000ULL)
184 /* Allows for listen(2). */
185 #define CAP_LISTEN CAPRIGHT(0, 0x0000000800000000ULL)
186 /* Allows for sctp_peeloff(2). */
187 #define CAP_PEELOFF CAPRIGHT(0, 0x0000001000000000ULL)
188 #define CAP_RECV CAP_READ
189 #define CAP_SEND CAP_WRITE
190 /* Allows for setsockopt(2). */
191 #define CAP_SETSOCKOPT CAPRIGHT(0, 0x0000002000000000ULL)
192 /* Allows for shutdown(2). */
193 #define CAP_SHUTDOWN CAPRIGHT(0, 0x0000004000000000ULL)
195 /* Allows for bindat(2) on a directory descriptor. */
196 #define CAP_BINDAT (CAP_LOOKUP | 0x0000008000000000ULL)
197 /* Allows for connectat(2) on a directory descriptor. */
198 #define CAP_CONNECTAT (CAP_LOOKUP | 0x0000010000000000ULL)
200 /* Allows for linkat(2) (source directory descriptor). */
201 #define CAP_LINKAT_SOURCE (CAP_LOOKUP | 0x0000020000000000ULL)
202 /* Allows for renameat(2) (target directory descriptor). */
203 #define CAP_RENAMEAT_TARGET (CAP_LOOKUP | 0x0000040000000000ULL)
205 #define CAP_SOCK_CLIENT \
206 (CAP_CONNECT | CAP_GETPEERNAME | CAP_GETSOCKNAME | CAP_GETSOCKOPT | \
207 CAP_PEELOFF | CAP_RECV | CAP_SEND | CAP_SETSOCKOPT | CAP_SHUTDOWN)
208 #define CAP_SOCK_SERVER \
209 (CAP_ACCEPT | CAP_BIND | CAP_GETPEERNAME | CAP_GETSOCKNAME | \
210 CAP_GETSOCKOPT | CAP_LISTEN | CAP_PEELOFF | CAP_RECV | CAP_SEND | \
211 CAP_SETSOCKOPT | CAP_SHUTDOWN)
213 /* All used bits for index 0. */
214 #define CAP_ALL0 CAPRIGHT(0, 0x000007FFFFFFFFFFULL)
216 /* Available bits for index 0. */
217 #define CAP_UNUSED0_44 CAPRIGHT(0, 0x0000080000000000ULL)
219 #define CAP_UNUSED0_57 CAPRIGHT(0, 0x0100000000000000ULL)
223 /* Mandatory Access Control. */
224 /* Allows for mac_get_fd(3). */
225 #define CAP_MAC_GET CAPRIGHT(1, 0x0000000000000001ULL)
226 /* Allows for mac_set_fd(3). */
227 #define CAP_MAC_SET CAPRIGHT(1, 0x0000000000000002ULL)
229 /* Methods on semaphores. */
230 #define CAP_SEM_GETVALUE CAPRIGHT(1, 0x0000000000000004ULL)
231 #define CAP_SEM_POST CAPRIGHT(1, 0x0000000000000008ULL)
232 #define CAP_SEM_WAIT CAPRIGHT(1, 0x0000000000000010ULL)
234 /* Allows select(2) and poll(2) on descriptor. */
235 #define CAP_EVENT CAPRIGHT(1, 0x0000000000000020ULL)
236 /* Allows for kevent(2) on kqueue descriptor with eventlist != NULL. */
237 #define CAP_KQUEUE_EVENT CAPRIGHT(1, 0x0000000000000040ULL)
239 /* Strange and powerful rights that should not be given lightly. */
240 /* Allows for ioctl(2). */
241 #define CAP_IOCTL CAPRIGHT(1, 0x0000000000000080ULL)
242 #define CAP_TTYHOOK CAPRIGHT(1, 0x0000000000000100ULL)
244 /* Process management via process descriptors. */
245 /* Allows for pdgetpid(2). */
246 #define CAP_PDGETPID CAPRIGHT(1, 0x0000000000000200ULL)
248 * Allows for pdwait4(2).
250 * XXX: this constant was imported unused, but is targeted to be implemented
251 * in the future (bug 235871).
253 #define CAP_PDWAIT CAPRIGHT(1, 0x0000000000000400ULL)
254 /* Allows for pdkill(2). */
255 #define CAP_PDKILL CAPRIGHT(1, 0x0000000000000800ULL)
257 /* Extended attributes. */
258 /* Allows for extattr_delete_fd(2). */
259 #define CAP_EXTATTR_DELETE CAPRIGHT(1, 0x0000000000001000ULL)
260 /* Allows for extattr_get_fd(2). */
261 #define CAP_EXTATTR_GET CAPRIGHT(1, 0x0000000000002000ULL)
262 /* Allows for extattr_list_fd(2). */
263 #define CAP_EXTATTR_LIST CAPRIGHT(1, 0x0000000000004000ULL)
264 /* Allows for extattr_set_fd(2). */
265 #define CAP_EXTATTR_SET CAPRIGHT(1, 0x0000000000008000ULL)
267 /* Access Control Lists. */
268 /* Allows for acl_valid_fd_np(3). */
269 #define CAP_ACL_CHECK CAPRIGHT(1, 0x0000000000010000ULL)
270 /* Allows for acl_delete_fd_np(3). */
271 #define CAP_ACL_DELETE CAPRIGHT(1, 0x0000000000020000ULL)
272 /* Allows for acl_get_fd(3) and acl_get_fd_np(3). */
273 #define CAP_ACL_GET CAPRIGHT(1, 0x0000000000040000ULL)
274 /* Allows for acl_set_fd(3) and acl_set_fd_np(3). */
275 #define CAP_ACL_SET CAPRIGHT(1, 0x0000000000080000ULL)
277 /* Allows for kevent(2) on kqueue descriptor with changelist != NULL. */
278 #define CAP_KQUEUE_CHANGE CAPRIGHT(1, 0x0000000000100000ULL)
280 #define CAP_KQUEUE (CAP_KQUEUE_EVENT | CAP_KQUEUE_CHANGE)
282 /* All used bits for index 1. */
283 #define CAP_ALL1 CAPRIGHT(1, 0x00000000001FFFFFULL)
285 /* Available bits for index 1. */
286 #define CAP_UNUSED1_22 CAPRIGHT(1, 0x0000000000200000ULL)
288 #define CAP_UNUSED1_57 CAPRIGHT(1, 0x0100000000000000ULL)
290 /* Backward compatibility. */
291 #define CAP_POLL_EVENT CAP_EVENT
293 #define CAP_ALL(rights) do { \
294 (rights)->cr_rights[0] = \
295 ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAP_ALL0; \
296 (rights)->cr_rights[1] = CAP_ALL1; \
299 #define CAP_NONE(rights) do { \
300 (rights)->cr_rights[0] = \
301 ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAPRIGHT(0, 0ULL); \
302 (rights)->cr_rights[1] = CAPRIGHT(1, 0ULL); \
305 #define CAPRVER(right) ((int)((right) >> 62))
306 #define CAPVER(rights) CAPRVER((rights)->cr_rights[0])
307 #define CAPARSIZE(rights) (CAPVER(rights) + 2)
308 #define CAPIDXBIT(right) ((int)(((right) >> 57) & 0x1F))
311 * Allowed fcntl(2) commands.
313 #define CAP_FCNTL_GETFL (1 << F_GETFL)
314 #define CAP_FCNTL_SETFL (1 << F_SETFL)
315 #define CAP_FCNTL_GETOWN (1 << F_GETOWN)
316 #define CAP_FCNTL_SETOWN (1 << F_SETOWN)
317 #define CAP_FCNTL_ALL (CAP_FCNTL_GETFL | CAP_FCNTL_SETFL | \
318 CAP_FCNTL_GETOWN | CAP_FCNTL_SETOWN)
320 #define CAP_IOCTLS_ALL SSIZE_MAX
324 #define cap_rights_init(...) \
325 __cap_rights_init(CAP_RIGHTS_VERSION, __VA_ARGS__, 0ULL)
326 cap_rights_t *__cap_rights_init(int version, cap_rights_t *rights, ...);
328 #define cap_rights_set(...) \
329 __cap_rights_set(__VA_ARGS__, 0ULL)
330 cap_rights_t *__cap_rights_set(cap_rights_t *rights, ...);
332 #define cap_rights_clear(...) \
333 __cap_rights_clear(__VA_ARGS__, 0ULL)
334 cap_rights_t *__cap_rights_clear(cap_rights_t *rights, ...);
336 #define cap_rights_is_set(...) \
337 __cap_rights_is_set(__VA_ARGS__, 0ULL)
338 bool __cap_rights_is_set(const cap_rights_t *rights, ...);
340 bool cap_rights_is_valid(const cap_rights_t *rights);
341 cap_rights_t *cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src);
342 cap_rights_t *cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src);
346 * We only support one size to reduce branching.
348 _Static_assert(CAP_RIGHTS_VERSION == CAP_RIGHTS_VERSION_00,
349 "unsupported version of capsicum rights");
351 #define cap_rights_init_zero(r) ({ \
352 cap_rights_t *_r = (r); \
357 #define cap_rights_init_one(r, right) ({ \
358 CTASSERT(CAPRVER(right) == CAP_RIGHTS_VERSION); \
359 cap_rights_t *_r = (r); \
361 _r->cr_rights[CAPIDXBIT(right) - 1] |= right; \
365 #define cap_rights_set_one(r, right) ({ \
366 CTASSERT(CAPRVER(right) == CAP_RIGHTS_VERSION); \
367 cap_rights_t *_r = (r); \
368 _r->cr_rights[CAPIDXBIT(right) - 1] |= right; \
373 * Allow checking caps which are possibly getting modified at the same time.
374 * The caller is expected to determine whether the result is legitimate via
375 * other means, see fget_unlocked for an example.
379 cap_rights_contains_transient(const cap_rights_t *big, const cap_rights_t *little)
383 (big->cr_rights[0] & little->cr_rights[0]) == little->cr_rights[0] &&
384 (big->cr_rights[1] & little->cr_rights[1]) == little->cr_rights[1]))
389 #define cap_rights_contains cap_rights_contains_transient
391 int cap_check_failed_notcapable(const cap_rights_t *havep,
392 const cap_rights_t *needp);
395 cap_check_inline(const cap_rights_t *havep, const cap_rights_t *needp)
398 if (__predict_false(!cap_rights_contains(havep, needp)))
399 return (cap_check_failed_notcapable(havep, needp));
404 cap_check_inline_transient(const cap_rights_t *havep, const cap_rights_t *needp)
407 if (__predict_false(!cap_rights_contains(havep, needp)))
412 bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little);
419 #include <sys/systm.h>
421 #define IN_CAPABILITY_MODE(td) (((td)->td_ucred->cr_flags & CRED_FLAG_CAPMODE) != 0)
427 * Test whether a capability grants the requested rights.
429 int cap_check(const cap_rights_t *havep, const cap_rights_t *needp);
431 * Convert capability rights into VM access flags.
433 vm_prot_t cap_rights_to_vmprot(const cap_rights_t *havep);
436 * For the purposes of procstat(1) and similar tools, allow kern_descrip.c to
437 * extract the rights from a capability.
439 * Dereferencing fdep requires filedesc.h, but including it would cause
440 * significant pollution. Instead add a macro for consumers which want it,
441 * most notably kern_descrip.c.
443 #define cap_rights_fde_inline(fdep) (&(fdep)->fde_rights)
445 const cap_rights_t *cap_rights_fde(const struct filedescent *fde);
446 const cap_rights_t *cap_rights(struct filedesc *fdp, int fd);
448 int cap_ioctl_check(struct filedesc *fdp, int fd, u_long cmd);
449 int cap_fcntl_check_fde(struct filedescent *fde, int cmd);
450 int cap_fcntl_check(struct filedesc *fdp, int fd, int cmd);
452 extern bool trap_enotcap;
458 * cap_enter(): Cause the process to enter capability mode, which will
459 * prevent it from directly accessing global namespaces. System calls will
460 * be limited to process-local, process-inherited, or file descriptor
461 * operations. If already in capability mode, a no-op.
466 * Are we sandboxed (in capability mode)?
467 * This is a libc wrapper around the cap_getmode(2) system call.
469 bool cap_sandboxed(void);
472 * cap_getmode(): Are we in capability mode?
474 int cap_getmode(u_int *modep);
477 * Limits capability rights for the given descriptor (CAP_*).
479 int cap_rights_limit(int fd, const cap_rights_t *rights);
481 * Returns capability rights for the given descriptor.
483 #define cap_rights_get(fd, rights) \
484 __cap_rights_get(CAP_RIGHTS_VERSION, (fd), (rights))
485 int __cap_rights_get(int version, int fd, cap_rights_t *rights);
487 * Limits allowed ioctls for the given descriptor.
489 int cap_ioctls_limit(int fd, const cap_ioctl_t *cmds, size_t ncmds);
491 * Returns array of allowed ioctls for the given descriptor.
492 * If all ioctls are allowed, the cmds array is not populated and
493 * the function returns CAP_IOCTLS_ALL.
495 ssize_t cap_ioctls_get(int fd, cap_ioctl_t *cmds, size_t maxcmds);
497 * Limits allowed fcntls for the given descriptor (CAP_FCNTL_*).
499 int cap_fcntls_limit(int fd, uint32_t fcntlrights);
501 * Returns bitmask of allowed fcntls for the given descriptor.
503 int cap_fcntls_get(int fd, uint32_t *fcntlrightsp);
507 #endif /* !_KERNEL */
509 #endif /* !_SYS_CAPSICUM_H_ */