2 * Copyright (c) 2008-2010 Robert N. M. Watson
3 * Copyright (c) 2012 FreeBSD Foundation
6 * This software was developed at the University of Cambridge Computer
7 * Laboratory with support from a grant from Google, Inc.
9 * Portions of this software were developed by Pawel Jakub Dawidek under
10 * sponsorship from the FreeBSD Foundation.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * Definitions for FreeBSD capabilities facility.
39 #ifndef _SYS_CAPABILITY_H_
40 #define _SYS_CAPABILITY_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 pread(2), preadv(2). */
83 #define CAP_PREAD (CAP_SEEK | CAP_READ)
84 /* Allows for openat(O_WRONLY) (without O_APPEND), pwrite(2), pwritev(2). */
85 #define CAP_PWRITE (CAP_SEEK | CAP_WRITE)
86 /* Allows for mmap(PROT_NONE). */
87 #define CAP_MMAP CAPRIGHT(0, 0x0000000000000010ULL)
88 /* Allows for mmap(PROT_READ). */
89 #define CAP_MMAP_R (CAP_MMAP | CAP_SEEK | CAP_READ)
90 /* Allows for mmap(PROT_WRITE). */
91 #define CAP_MMAP_W (CAP_MMAP | CAP_SEEK | CAP_WRITE)
92 /* Allows for mmap(PROT_EXEC). */
93 #define CAP_MMAP_X (CAP_MMAP | CAP_SEEK | 0x0000000000000020ULL)
94 /* Allows for mmap(PROT_READ | PROT_WRITE). */
95 #define CAP_MMAP_RW (CAP_MMAP_R | CAP_MMAP_W)
96 /* Allows for mmap(PROT_READ | PROT_EXEC). */
97 #define CAP_MMAP_RX (CAP_MMAP_R | CAP_MMAP_X)
98 /* Allows for mmap(PROT_WRITE | PROT_EXEC). */
99 #define CAP_MMAP_WX (CAP_MMAP_W | CAP_MMAP_X)
100 /* Allows for mmap(PROT_READ | PROT_WRITE | PROT_EXEC). */
101 #define CAP_MMAP_RWX (CAP_MMAP_R | CAP_MMAP_W | CAP_MMAP_X)
102 /* Allows for openat(O_CREAT). */
103 #define CAP_CREATE CAPRIGHT(0, 0x0000000000000040ULL)
104 /* Allows for openat(O_EXEC) and fexecve(2) in turn. */
105 #define CAP_FEXECVE CAPRIGHT(0, 0x0000000000000080ULL)
106 /* Allows for openat(O_SYNC), openat(O_FSYNC), fsync(2). */
107 #define CAP_FSYNC CAPRIGHT(0, 0x0000000000000100ULL)
108 /* Allows for openat(O_TRUNC), ftruncate(2). */
109 #define CAP_FTRUNCATE CAPRIGHT(0, 0x0000000000000200ULL)
111 /* Lookups - used to constrain *at() calls. */
112 #define CAP_LOOKUP CAPRIGHT(0, 0x0000000000000400ULL)
115 #define CAP_FCHDIR CAPRIGHT(0, 0x0000000000000800ULL)
116 #define CAP_FCHFLAGS CAPRIGHT(0, 0x0000000000001000ULL)
117 #define CAP_CHFLAGSAT (CAP_FCHFLAGS | CAP_LOOKUP)
118 #define CAP_FCHMOD CAPRIGHT(0, 0x0000000000002000ULL)
119 #define CAP_FCHMODAT (CAP_FCHMOD | CAP_LOOKUP)
120 #define CAP_FCHOWN CAPRIGHT(0, 0x0000000000004000ULL)
121 #define CAP_FCHOWNAT (CAP_FCHOWN | CAP_LOOKUP)
122 #define CAP_FCNTL CAPRIGHT(0, 0x0000000000008000ULL)
123 #define CAP_FLOCK CAPRIGHT(0, 0x0000000000010000ULL)
124 #define CAP_FPATHCONF CAPRIGHT(0, 0x0000000000020000ULL)
125 #define CAP_FSCK CAPRIGHT(0, 0x0000000000040000ULL)
126 #define CAP_FSTAT CAPRIGHT(0, 0x0000000000080000ULL)
127 #define CAP_FSTATAT (CAP_FSTAT | CAP_LOOKUP)
128 #define CAP_FSTATFS CAPRIGHT(0, 0x0000000000100000ULL)
129 #define CAP_FUTIMES CAPRIGHT(0, 0x0000000000200000ULL)
130 #define CAP_FUTIMESAT (CAP_FUTIMES | CAP_LOOKUP)
131 #define CAP_LINKAT CAPRIGHT(0, 0x0000000000400000ULL)
132 #define CAP_MKDIRAT CAPRIGHT(0, 0x0000000000800000ULL)
133 #define CAP_MKFIFOAT CAPRIGHT(0, 0x0000000001000000ULL)
134 #define CAP_MKNODAT CAPRIGHT(0, 0x0000000002000000ULL)
135 #define CAP_RENAMEAT CAPRIGHT(0, 0x0000000004000000ULL)
136 #define CAP_SYMLINKAT CAPRIGHT(0, 0x0000000008000000ULL)
137 #define CAP_UNLINKAT CAPRIGHT(0, 0x0000000010000000ULL)
139 /* Extended attributes. */
140 #define CAP_EXTATTR_DELETE CAPRIGHT(0, 0x0000000020000000ULL)
141 #define CAP_EXTATTR_GET CAPRIGHT(0, 0x0000000040000000ULL)
142 #define CAP_EXTATTR_LIST CAPRIGHT(0, 0x0000000080000000ULL)
143 #define CAP_EXTATTR_SET CAPRIGHT(0, 0x0000000100000000ULL)
145 /* Access Control Lists. */
146 #define CAP_ACL_CHECK CAPRIGHT(0, 0x0000000200000000ULL)
147 #define CAP_ACL_DELETE CAPRIGHT(0, 0x0000000400000000ULL)
148 #define CAP_ACL_GET CAPRIGHT(0, 0x0000000800000000ULL)
149 #define CAP_ACL_SET CAPRIGHT(0, 0x0000001000000000ULL)
151 /* Socket operations. */
152 #define CAP_ACCEPT CAPRIGHT(0, 0x0000002000000000ULL)
153 #define CAP_BIND CAPRIGHT(0, 0x0000004000000000ULL)
154 #define CAP_CONNECT CAPRIGHT(0, 0x0000008000000000ULL)
155 #define CAP_GETPEERNAME CAPRIGHT(0, 0x0000010000000000ULL)
156 #define CAP_GETSOCKNAME CAPRIGHT(0, 0x0000020000000000ULL)
157 #define CAP_GETSOCKOPT CAPRIGHT(0, 0x0000040000000000ULL)
158 #define CAP_LISTEN CAPRIGHT(0, 0x0000080000000000ULL)
159 #define CAP_PEELOFF CAPRIGHT(0, 0x0000100000000000ULL)
160 #define CAP_RECV CAP_READ
161 #define CAP_SEND CAP_WRITE
162 #define CAP_SETSOCKOPT CAPRIGHT(0, 0x0000200000000000ULL)
163 #define CAP_SHUTDOWN CAPRIGHT(0, 0x0000400000000000ULL)
165 #define CAP_SOCK_CLIENT \
166 (CAP_CONNECT | CAP_GETPEERNAME | CAP_GETSOCKNAME | CAP_GETSOCKOPT | \
167 CAP_PEELOFF | CAP_RECV | CAP_SEND | CAP_SETSOCKOPT | CAP_SHUTDOWN)
168 #define CAP_SOCK_SERVER \
169 (CAP_ACCEPT | CAP_BIND | CAP_GETPEERNAME | CAP_GETSOCKNAME | \
170 CAP_GETSOCKOPT | CAP_LISTEN | CAP_PEELOFF | CAP_RECV | CAP_SEND | \
171 CAP_SETSOCKOPT | CAP_SHUTDOWN)
173 /* All used bits for index 0. */
174 #define CAP_ALL0 CAPRIGHT(0, 0x00007FFFFFFFFFFFULL)
176 /* Available bits for index 0. */
177 #define CAP_UNUSED0_48 CAPRIGHT(0, 0x0000800000000000ULL)
179 #define CAP_UNUSED0_57 CAPRIGHT(0, 0x0100000000000000ULL)
183 /* Mandatory Access Control. */
184 #define CAP_MAC_GET CAPRIGHT(1, 0x0000000000000001ULL)
185 #define CAP_MAC_SET CAPRIGHT(1, 0x0000000000000002ULL)
187 /* Methods on semaphores. */
188 #define CAP_SEM_GETVALUE CAPRIGHT(1, 0x0000000000000004ULL)
189 #define CAP_SEM_POST CAPRIGHT(1, 0x0000000000000008ULL)
190 #define CAP_SEM_WAIT CAPRIGHT(1, 0x0000000000000010ULL)
193 #define CAP_POLL_EVENT CAPRIGHT(1, 0x0000000000000020ULL)
194 #define CAP_POST_EVENT CAPRIGHT(1, 0x0000000000000040ULL)
196 /* Strange and powerful rights that should not be given lightly. */
197 #define CAP_IOCTL CAPRIGHT(1, 0x0000000000000080ULL)
198 #define CAP_TTYHOOK CAPRIGHT(1, 0x0000000000000100ULL)
200 /* Process management via process descriptors. */
201 #define CAP_PDGETPID CAPRIGHT(1, 0x0000000000000200ULL)
202 #define CAP_PDWAIT CAPRIGHT(1, 0x0000000000000400ULL)
203 #define CAP_PDKILL CAPRIGHT(1, 0x0000000000000800ULL)
206 * Rights that allow to use bindat(2) and connectat(2) syscalls on a
207 * directory descriptor.
209 #define CAP_BINDAT CAPRIGHT(1, 0x0000000000001000ULL)
210 #define CAP_CONNECTAT CAPRIGHT(1, 0x0000000000002000ULL)
212 /* All used bits for index 1. */
213 #define CAP_ALL1 CAPRIGHT(1, 0x0000000000003FFFULL)
215 /* Available bits for index 1. */
216 #define CAP_UNUSED1_15 CAPRIGHT(1, 0x0000000000004000ULL)
218 #define CAP_UNUSED1_57 CAPRIGHT(1, 0x0100000000000000ULL)
220 #define CAP_ALL(rights) do { \
221 (rights)->cr_rights[0] = \
222 ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAP_ALL0; \
223 (rights)->cr_rights[1] = CAP_ALL1; \
226 #define CAP_NONE(rights) do { \
227 (rights)->cr_rights[0] = \
228 ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAPRIGHT(0, 0ULL); \
229 (rights)->cr_rights[1] = CAPRIGHT(1, 0ULL); \
232 #define CAPRVER(right) ((int)((right) >> 62))
233 #define CAPVER(rights) CAPRVER((rights)->cr_rights[0])
234 #define CAPARSIZE(rights) (CAPVER(rights) + 2)
235 #define CAPIDXBIT(right) ((int)(((right) >> 57) & 0x1F))
238 * Allowed fcntl(2) commands.
240 #define CAP_FCNTL_GETFL (1 << F_GETFL)
241 #define CAP_FCNTL_SETFL (1 << F_SETFL)
242 #if __BSD_VISIBLE || __XSI_VISIBLE || __POSIX_VISIBLE >= 200112
243 #define CAP_FCNTL_GETOWN (1 << F_GETOWN)
244 #define CAP_FCNTL_SETOWN (1 << F_SETOWN)
246 #if __BSD_VISIBLE || __XSI_VISIBLE || __POSIX_VISIBLE >= 200112
247 #define CAP_FCNTL_ALL (CAP_FCNTL_GETFL | CAP_FCNTL_SETFL | \
248 CAP_FCNTL_GETOWN | CAP_FCNTL_SETOWN)
250 #define CAP_FCNTL_ALL (CAP_FCNTL_GETFL | CAP_FCNTL_SETFL)
253 #define CAP_IOCTLS_ALL SSIZE_MAX
255 #define cap_rights_init(...) \
256 __cap_rights_init(CAP_RIGHTS_VERSION, __VA_ARGS__, 0ULL)
257 cap_rights_t *__cap_rights_init(int version, cap_rights_t *rights, ...);
259 #define cap_rights_set(rights, ...) \
260 __cap_rights_set((rights), __VA_ARGS__, 0ULL)
261 void __cap_rights_set(cap_rights_t *rights, ...);
263 #define cap_rights_clear(rights, ...) \
264 __cap_rights_clear((rights), __VA_ARGS__, 0ULL)
265 void __cap_rights_clear(cap_rights_t *rights, ...);
267 #define cap_rights_is_set(rights, ...) \
268 __cap_rights_is_set((rights), __VA_ARGS__, 0ULL)
269 bool __cap_rights_is_set(const cap_rights_t *rights, ...);
271 bool cap_rights_is_valid(const cap_rights_t *rights);
272 void cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src);
273 void cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src);
274 bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little);
278 #include <sys/systm.h>
280 #define IN_CAPABILITY_MODE(td) ((td->td_ucred->cr_flags & CRED_FLAG_CAPMODE) != 0)
285 * Test whether a capability grants the requested rights.
287 int cap_check(const cap_rights_t *havep, const cap_rights_t *needp);
289 * Convert capability rights into VM access flags.
291 u_char cap_rights_to_vmprot(cap_rights_t *havep);
294 * For the purposes of procstat(1) and similar tools, allow kern_descrip.c to
295 * extract the rights from a capability.
297 cap_rights_t *cap_rights(struct filedesc *fdp, int fd);
299 int cap_ioctl_check(struct filedesc *fdp, int fd, u_long cmd);
300 int cap_fcntl_check(struct filedesc *fdp, int fd, int cmd);
306 * cap_enter(): Cause the process to enter capability mode, which will
307 * prevent it from directly accessing global namespaces. System calls will
308 * be limited to process-local, process-inherited, or file descriptor
309 * operations. If already in capability mode, a no-op.
314 * Are we sandboxed (in capability mode)?
315 * This is a libc wrapper around the cap_getmode(2) system call.
317 bool cap_sandboxed(void);
320 * cap_getmode(): Are we in capability mode?
322 int cap_getmode(u_int *modep);
325 * Limits capability rights for the given descriptor (CAP_*).
327 int cap_rights_limit(int fd, const cap_rights_t *rights);
329 * Returns capability rights for the given descriptor.
331 #define cap_rights_get(fd, rights) __cap_rights_get(CAP_RIGHTS_VERSION, (fd), (rights))
332 int __cap_rights_get(int version, int fd, cap_rights_t *rightsp);
334 * Limits allowed ioctls for the given descriptor.
336 int cap_ioctls_limit(int fd, const unsigned long *cmds, size_t ncmds);
338 * Returns array of allowed ioctls for the given descriptor.
339 * If all ioctls are allowed, the cmds array is not populated and
340 * the function returns CAP_IOCTLS_ALL.
342 ssize_t cap_ioctls_get(int fd, unsigned long *cmds, size_t maxcmds);
344 * Limits allowed fcntls for the given descriptor (CAP_FCNTL_*).
346 int cap_fcntls_limit(int fd, uint32_t fcntlrights);
348 * Returns bitmask of allowed fcntls for the given descriptor.
350 int cap_fcntls_get(int fd, uint32_t *fcntlrightsp);
354 #endif /* !_KERNEL */
356 #endif /* !_SYS_CAPABILITY_H_ */