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Linux/include/uapi/linux/capability.h

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  1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2 /*
  3  * This is <linux/capability.h>
  4  *
  5  * Andrew G. Morgan <morgan@kernel.org>
  6  * Alexander Kjeldaas <astor@guardian.no>
  7  * with help from Aleph1, Roland Buresund and Andrew Main.
  8  *
  9  * See here for the libcap library ("POSIX draft" compliance):
 10  *
 11  * ftp://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
 12  */
 13 
 14 #ifndef _UAPI_LINUX_CAPABILITY_H
 15 #define _UAPI_LINUX_CAPABILITY_H
 16 
 17 #include <linux/types.h>
 18 
 19 /* User-level do most of the mapping between kernel and user
 20    capabilities based on the version tag given by the kernel. The
 21    kernel might be somewhat backwards compatible, but don't bet on
 22    it. */
 23 
 24 /* Note, cap_t, is defined by POSIX (draft) to be an "opaque" pointer to
 25    a set of three capability sets.  The transposition of 3*the
 26    following structure to such a composite is better handled in a user
 27    library since the draft standard requires the use of malloc/free
 28    etc.. */
 29 
 30 #define _LINUX_CAPABILITY_VERSION_1  0x19980330
 31 #define _LINUX_CAPABILITY_U32S_1     1
 32 
 33 #define _LINUX_CAPABILITY_VERSION_2  0x20071026  /* deprecated - use v3 */
 34 #define _LINUX_CAPABILITY_U32S_2     2
 35 
 36 #define _LINUX_CAPABILITY_VERSION_3  0x20080522
 37 #define _LINUX_CAPABILITY_U32S_3     2
 38 
 39 typedef struct __user_cap_header_struct {
 40         __u32 version;
 41         int pid;
 42 } __user *cap_user_header_t;
 43 
 44 typedef struct __user_cap_data_struct {
 45         __u32 effective;
 46         __u32 permitted;
 47         __u32 inheritable;
 48 } __user *cap_user_data_t;
 49 
 50 
 51 #define VFS_CAP_REVISION_MASK   0xFF000000
 52 #define VFS_CAP_REVISION_SHIFT  24
 53 #define VFS_CAP_FLAGS_MASK      ~VFS_CAP_REVISION_MASK
 54 #define VFS_CAP_FLAGS_EFFECTIVE 0x000001
 55 
 56 #define VFS_CAP_REVISION_1      0x01000000
 57 #define VFS_CAP_U32_1           1
 58 #define XATTR_CAPS_SZ_1         (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1))
 59 
 60 #define VFS_CAP_REVISION_2      0x02000000
 61 #define VFS_CAP_U32_2           2
 62 #define XATTR_CAPS_SZ_2         (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2))
 63 
 64 #define VFS_CAP_REVISION_3      0x03000000
 65 #define VFS_CAP_U32_3           2
 66 #define XATTR_CAPS_SZ_3         (sizeof(__le32)*(2 + 2*VFS_CAP_U32_3))
 67 
 68 #define XATTR_CAPS_SZ           XATTR_CAPS_SZ_3
 69 #define VFS_CAP_U32             VFS_CAP_U32_3
 70 #define VFS_CAP_REVISION        VFS_CAP_REVISION_3
 71 
 72 struct vfs_cap_data {
 73         __le32 magic_etc;            /* Little endian */
 74         struct {
 75                 __le32 permitted;    /* Little endian */
 76                 __le32 inheritable;  /* Little endian */
 77         } data[VFS_CAP_U32];
 78 };
 79 
 80 /*
 81  * same as vfs_cap_data but with a rootid at the end
 82  */
 83 struct vfs_ns_cap_data {
 84         __le32 magic_etc;
 85         struct {
 86                 __le32 permitted;    /* Little endian */
 87                 __le32 inheritable;  /* Little endian */
 88         } data[VFS_CAP_U32];
 89         __le32 rootid;
 90 };
 91 
 92 #ifndef __KERNEL__
 93 
 94 /*
 95  * Backwardly compatible definition for source code - trapped in a
 96  * 32-bit world. If you find you need this, please consider using
 97  * libcap to untrap yourself...
 98  */
 99 #define _LINUX_CAPABILITY_VERSION  _LINUX_CAPABILITY_VERSION_1
100 #define _LINUX_CAPABILITY_U32S     _LINUX_CAPABILITY_U32S_1
101 
102 #endif
103 
104 
105 /**
106  ** POSIX-draft defined capabilities.
107  **/
108 
109 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
110    overrides the restriction of changing file ownership and group
111    ownership. */
112 
113 #define CAP_CHOWN            0
114 
115 /* Override all DAC access, including ACL execute access if
116    [_POSIX_ACL] is defined. Excluding DAC access covered by
117    CAP_LINUX_IMMUTABLE. */
118 
119 #define CAP_DAC_OVERRIDE     1
120 
121 /* Overrides all DAC restrictions regarding read and search on files
122    and directories, including ACL restrictions if [_POSIX_ACL] is
123    defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
124 
125 #define CAP_DAC_READ_SEARCH  2
126 
127 /* Overrides all restrictions about allowed operations on files, where
128    file owner ID must be equal to the user ID, except where CAP_FSETID
129    is applicable. It doesn't override MAC and DAC restrictions. */
130 
131 #define CAP_FOWNER           3
132 
133 /* Overrides the following restrictions that the effective user ID
134    shall match the file owner ID when setting the S_ISUID and S_ISGID
135    bits on that file; that the effective group ID (or one of the
136    supplementary group IDs) shall match the file owner ID when setting
137    the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
138    cleared on successful return from chown(2) (not implemented). */
139 
140 #define CAP_FSETID           4
141 
142 /* Overrides the restriction that the real or effective user ID of a
143    process sending a signal must match the real or effective user ID
144    of the process receiving the signal. */
145 
146 #define CAP_KILL             5
147 
148 /* Allows setgid(2) manipulation */
149 /* Allows setgroups(2) */
150 /* Allows forged gids on socket credentials passing. */
151 
152 #define CAP_SETGID           6
153 
154 /* Allows set*uid(2) manipulation (including fsuid). */
155 /* Allows forged pids on socket credentials passing. */
156 
157 #define CAP_SETUID           7
158 
159 
160 /**
161  ** Linux-specific capabilities
162  **/
163 
164 /* Without VFS support for capabilities:
165  *   Transfer any capability in your permitted set to any pid,
166  *   remove any capability in your permitted set from any pid
167  * With VFS support for capabilities (neither of above, but)
168  *   Add any capability from current's capability bounding set
169  *       to the current process' inheritable set
170  *   Allow taking bits out of capability bounding set
171  *   Allow modification of the securebits for a process
172  */
173 
174 #define CAP_SETPCAP          8
175 
176 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
177 
178 #define CAP_LINUX_IMMUTABLE  9
179 
180 /* Allows binding to TCP/UDP sockets below 1024 */
181 /* Allows binding to ATM VCIs below 32 */
182 
183 #define CAP_NET_BIND_SERVICE 10
184 
185 /* Allow broadcasting, listen to multicast */
186 
187 #define CAP_NET_BROADCAST    11
188 
189 /* Allow interface configuration */
190 /* Allow administration of IP firewall, masquerading and accounting */
191 /* Allow setting debug option on sockets */
192 /* Allow modification of routing tables */
193 /* Allow setting arbitrary process / process group ownership on
194    sockets */
195 /* Allow binding to any address for transparent proxying (also via NET_RAW) */
196 /* Allow setting TOS (type of service) */
197 /* Allow setting promiscuous mode */
198 /* Allow clearing driver statistics */
199 /* Allow multicasting */
200 /* Allow read/write of device-specific registers */
201 /* Allow activation of ATM control sockets */
202 
203 #define CAP_NET_ADMIN        12
204 
205 /* Allow use of RAW sockets */
206 /* Allow use of PACKET sockets */
207 /* Allow binding to any address for transparent proxying (also via NET_ADMIN) */
208 
209 #define CAP_NET_RAW          13
210 
211 /* Allow locking of shared memory segments */
212 /* Allow mlock and mlockall (which doesn't really have anything to do
213    with IPC) */
214 
215 #define CAP_IPC_LOCK         14
216 
217 /* Override IPC ownership checks */
218 
219 #define CAP_IPC_OWNER        15
220 
221 /* Insert and remove kernel modules - modify kernel without limit */
222 #define CAP_SYS_MODULE       16
223 
224 /* Allow ioperm/iopl access */
225 /* Allow sending USB messages to any device via /dev/bus/usb */
226 
227 #define CAP_SYS_RAWIO        17
228 
229 /* Allow use of chroot() */
230 
231 #define CAP_SYS_CHROOT       18
232 
233 /* Allow ptrace() of any process */
234 
235 #define CAP_SYS_PTRACE       19
236 
237 /* Allow configuration of process accounting */
238 
239 #define CAP_SYS_PACCT        20
240 
241 /* Allow configuration of the secure attention key */
242 /* Allow administration of the random device */
243 /* Allow examination and configuration of disk quotas */
244 /* Allow setting the domainname */
245 /* Allow setting the hostname */
246 /* Allow calling bdflush() */
247 /* Allow mount() and umount(), setting up new smb connection */
248 /* Allow some autofs root ioctls */
249 /* Allow nfsservctl */
250 /* Allow VM86_REQUEST_IRQ */
251 /* Allow to read/write pci config on alpha */
252 /* Allow irix_prctl on mips (setstacksize) */
253 /* Allow flushing all cache on m68k (sys_cacheflush) */
254 /* Allow removing semaphores */
255 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
256    and shared memory */
257 /* Allow locking/unlocking of shared memory segment */
258 /* Allow turning swap on/off */
259 /* Allow forged pids on socket credentials passing */
260 /* Allow setting readahead and flushing buffers on block devices */
261 /* Allow setting geometry in floppy driver */
262 /* Allow turning DMA on/off in xd driver */
263 /* Allow administration of md devices (mostly the above, but some
264    extra ioctls) */
265 /* Allow tuning the ide driver */
266 /* Allow access to the nvram device */
267 /* Allow administration of apm_bios, serial and bttv (TV) device */
268 /* Allow manufacturer commands in isdn CAPI support driver */
269 /* Allow reading non-standardized portions of pci configuration space */
270 /* Allow DDI debug ioctl on sbpcd driver */
271 /* Allow setting up serial ports */
272 /* Allow sending raw qic-117 commands */
273 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending
274    arbitrary SCSI commands */
275 /* Allow setting encryption key on loopback filesystem */
276 /* Allow setting zone reclaim policy */
277 
278 #define CAP_SYS_ADMIN        21
279 
280 /* Allow use of reboot() */
281 
282 #define CAP_SYS_BOOT         22
283 
284 /* Allow raising priority and setting priority on other (different
285    UID) processes */
286 /* Allow use of FIFO and round-robin (realtime) scheduling on own
287    processes and setting the scheduling algorithm used by another
288    process. */
289 /* Allow setting cpu affinity on other processes */
290 
291 #define CAP_SYS_NICE         23
292 
293 /* Override resource limits. Set resource limits. */
294 /* Override quota limits. */
295 /* Override reserved space on ext2 filesystem */
296 /* Modify data journaling mode on ext3 filesystem (uses journaling
297    resources) */
298 /* NOTE: ext2 honors fsuid when checking for resource overrides, so
299    you can override using fsuid too */
300 /* Override size restrictions on IPC message queues */
301 /* Allow more than 64hz interrupts from the real-time clock */
302 /* Override max number of consoles on console allocation */
303 /* Override max number of keymaps */
304 
305 #define CAP_SYS_RESOURCE     24
306 
307 /* Allow manipulation of system clock */
308 /* Allow irix_stime on mips */
309 /* Allow setting the real-time clock */
310 
311 #define CAP_SYS_TIME         25
312 
313 /* Allow configuration of tty devices */
314 /* Allow vhangup() of tty */
315 
316 #define CAP_SYS_TTY_CONFIG   26
317 
318 /* Allow the privileged aspects of mknod() */
319 
320 #define CAP_MKNOD            27
321 
322 /* Allow taking of leases on files */
323 
324 #define CAP_LEASE            28
325 
326 /* Allow writing the audit log via unicast netlink socket */
327 
328 #define CAP_AUDIT_WRITE      29
329 
330 /* Allow configuration of audit via unicast netlink socket */
331 
332 #define CAP_AUDIT_CONTROL    30
333 
334 #define CAP_SETFCAP          31
335 
336 /* Override MAC access.
337    The base kernel enforces no MAC policy.
338    An LSM may enforce a MAC policy, and if it does and it chooses
339    to implement capability based overrides of that policy, this is
340    the capability it should use to do so. */
341 
342 #define CAP_MAC_OVERRIDE     32
343 
344 /* Allow MAC configuration or state changes.
345    The base kernel requires no MAC configuration.
346    An LSM may enforce a MAC policy, and if it does and it chooses
347    to implement capability based checks on modifications to that
348    policy or the data required to maintain it, this is the
349    capability it should use to do so. */
350 
351 #define CAP_MAC_ADMIN        33
352 
353 /* Allow configuring the kernel's syslog (printk behaviour) */
354 
355 #define CAP_SYSLOG           34
356 
357 /* Allow triggering something that will wake the system */
358 
359 #define CAP_WAKE_ALARM            35
360 
361 /* Allow preventing system suspends */
362 
363 #define CAP_BLOCK_SUSPEND    36
364 
365 /* Allow reading the audit log via multicast netlink socket */
366 
367 #define CAP_AUDIT_READ          37
368 
369 
370 #define CAP_LAST_CAP         CAP_AUDIT_READ
371 
372 #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)
373 
374 /*
375  * Bit location of each capability (used by user-space library and kernel)
376  */
377 
378 #define CAP_TO_INDEX(x)     ((x) >> 5)        /* 1 << 5 == bits in __u32 */
379 #define CAP_TO_MASK(x)      (1 << ((x) & 31)) /* mask for indexed __u32 */
380 
381 
382 #endif /* _UAPI_LINUX_CAPABILITY_H */
383 

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