Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
capability.h
Go to the documentation of this file.
1 /*
2  * This is <linux/capability.h>
3  *
4  * Andrew G. Morgan <[email protected]>
5  * Alexander Kjeldaas <[email protected]>
6  * with help from Aleph1, Roland Buresund and Andrew Main.
7  *
8  * See here for the libcap library ("POSIX draft" compliance):
9  *
10  * ftp://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
11  */
12 
13 #ifndef _UAPI_LINUX_CAPABILITY_H
14 #define _UAPI_LINUX_CAPABILITY_H
15 
16 #include <linux/types.h>
17 
18 struct task_struct;
19 
20 /* User-level do most of the mapping between kernel and user
21  capabilities based on the version tag given by the kernel. The
22  kernel might be somewhat backwards compatible, but don't bet on
23  it. */
24 
25 /* Note, cap_t, is defined by POSIX (draft) to be an "opaque" pointer to
26  a set of three capability sets. The transposition of 3*the
27  following structure to such a composite is better handled in a user
28  library since the draft standard requires the use of malloc/free
29  etc.. */
30 
31 #define _LINUX_CAPABILITY_VERSION_1 0x19980330
32 #define _LINUX_CAPABILITY_U32S_1 1
33 
34 #define _LINUX_CAPABILITY_VERSION_2 0x20071026 /* deprecated - use v3 */
35 #define _LINUX_CAPABILITY_U32S_2 2
36 
37 #define _LINUX_CAPABILITY_VERSION_3 0x20080522
38 #define _LINUX_CAPABILITY_U32S_3 2
39 
40 typedef struct __user_cap_header_struct {
42  int pid;
44 
45 typedef struct __user_cap_data_struct {
50 
51 
52 #define VFS_CAP_REVISION_MASK 0xFF000000
53 #define VFS_CAP_REVISION_SHIFT 24
54 #define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK
55 #define VFS_CAP_FLAGS_EFFECTIVE 0x000001
56 
57 #define VFS_CAP_REVISION_1 0x01000000
58 #define VFS_CAP_U32_1 1
59 #define XATTR_CAPS_SZ_1 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1))
60 
61 #define VFS_CAP_REVISION_2 0x02000000
62 #define VFS_CAP_U32_2 2
63 #define XATTR_CAPS_SZ_2 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2))
64 
65 #define XATTR_CAPS_SZ XATTR_CAPS_SZ_2
66 #define VFS_CAP_U32 VFS_CAP_U32_2
67 #define VFS_CAP_REVISION VFS_CAP_REVISION_2
68 
69 struct vfs_cap_data {
70  __le32 magic_etc; /* Little endian */
71  struct {
72  __le32 permitted; /* Little endian */
73  __le32 inheritable; /* Little endian */
74  } data[VFS_CAP_U32];
75 };
76 
77 #ifndef __KERNEL__
78 
79 /*
80  * Backwardly compatible definition for source code - trapped in a
81  * 32-bit world. If you find you need this, please consider using
82  * libcap to untrap yourself...
83  */
84 #define _LINUX_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_1
85 #define _LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_1
86 
87 #endif
88 
89 
94 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
95  overrides the restriction of changing file ownership and group
96  ownership. */
97 
98 #define CAP_CHOWN 0
99 
100 /* Override all DAC access, including ACL execute access if
101  [_POSIX_ACL] is defined. Excluding DAC access covered by
102  CAP_LINUX_IMMUTABLE. */
103 
104 #define CAP_DAC_OVERRIDE 1
105 
106 /* Overrides all DAC restrictions regarding read and search on files
107  and directories, including ACL restrictions if [_POSIX_ACL] is
108  defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
109 
110 #define CAP_DAC_READ_SEARCH 2
111 
112 /* Overrides all restrictions about allowed operations on files, where
113  file owner ID must be equal to the user ID, except where CAP_FSETID
114  is applicable. It doesn't override MAC and DAC restrictions. */
115 
116 #define CAP_FOWNER 3
117 
118 /* Overrides the following restrictions that the effective user ID
119  shall match the file owner ID when setting the S_ISUID and S_ISGID
120  bits on that file; that the effective group ID (or one of the
121  supplementary group IDs) shall match the file owner ID when setting
122  the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
123  cleared on successful return from chown(2) (not implemented). */
124 
125 #define CAP_FSETID 4
126 
127 /* Overrides the restriction that the real or effective user ID of a
128  process sending a signal must match the real or effective user ID
129  of the process receiving the signal. */
130 
131 #define CAP_KILL 5
132 
133 /* Allows setgid(2) manipulation */
134 /* Allows setgroups(2) */
135 /* Allows forged gids on socket credentials passing. */
136 
137 #define CAP_SETGID 6
138 
139 /* Allows set*uid(2) manipulation (including fsuid). */
140 /* Allows forged pids on socket credentials passing. */
141 
142 #define CAP_SETUID 7
143 
144 
149 /* Without VFS support for capabilities:
150  * Transfer any capability in your permitted set to any pid,
151  * remove any capability in your permitted set from any pid
152  * With VFS support for capabilities (neither of above, but)
153  * Add any capability from current's capability bounding set
154  * to the current process' inheritable set
155  * Allow taking bits out of capability bounding set
156  * Allow modification of the securebits for a process
157  */
158 
159 #define CAP_SETPCAP 8
160 
161 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
162 
163 #define CAP_LINUX_IMMUTABLE 9
164 
165 /* Allows binding to TCP/UDP sockets below 1024 */
166 /* Allows binding to ATM VCIs below 32 */
167 
168 #define CAP_NET_BIND_SERVICE 10
169 
170 /* Allow broadcasting, listen to multicast */
171 
172 #define CAP_NET_BROADCAST 11
173 
174 /* Allow interface configuration */
175 /* Allow administration of IP firewall, masquerading and accounting */
176 /* Allow setting debug option on sockets */
177 /* Allow modification of routing tables */
178 /* Allow setting arbitrary process / process group ownership on
179  sockets */
180 /* Allow binding to any address for transparent proxying (also via NET_RAW) */
181 /* Allow setting TOS (type of service) */
182 /* Allow setting promiscuous mode */
183 /* Allow clearing driver statistics */
184 /* Allow multicasting */
185 /* Allow read/write of device-specific registers */
186 /* Allow activation of ATM control sockets */
187 
188 #define CAP_NET_ADMIN 12
189 
190 /* Allow use of RAW sockets */
191 /* Allow use of PACKET sockets */
192 /* Allow binding to any address for transparent proxying (also via NET_ADMIN) */
193 
194 #define CAP_NET_RAW 13
195 
196 /* Allow locking of shared memory segments */
197 /* Allow mlock and mlockall (which doesn't really have anything to do
198  with IPC) */
199 
200 #define CAP_IPC_LOCK 14
201 
202 /* Override IPC ownership checks */
203 
204 #define CAP_IPC_OWNER 15
205 
206 /* Insert and remove kernel modules - modify kernel without limit */
207 #define CAP_SYS_MODULE 16
208 
209 /* Allow ioperm/iopl access */
210 /* Allow sending USB messages to any device via /proc/bus/usb */
211 
212 #define CAP_SYS_RAWIO 17
213 
214 /* Allow use of chroot() */
215 
216 #define CAP_SYS_CHROOT 18
217 
218 /* Allow ptrace() of any process */
219 
220 #define CAP_SYS_PTRACE 19
221 
222 /* Allow configuration of process accounting */
223 
224 #define CAP_SYS_PACCT 20
225 
226 /* Allow configuration of the secure attention key */
227 /* Allow administration of the random device */
228 /* Allow examination and configuration of disk quotas */
229 /* Allow setting the domainname */
230 /* Allow setting the hostname */
231 /* Allow calling bdflush() */
232 /* Allow mount() and umount(), setting up new smb connection */
233 /* Allow some autofs root ioctls */
234 /* Allow nfsservctl */
235 /* Allow VM86_REQUEST_IRQ */
236 /* Allow to read/write pci config on alpha */
237 /* Allow irix_prctl on mips (setstacksize) */
238 /* Allow flushing all cache on m68k (sys_cacheflush) */
239 /* Allow removing semaphores */
240 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
241  and shared memory */
242 /* Allow locking/unlocking of shared memory segment */
243 /* Allow turning swap on/off */
244 /* Allow forged pids on socket credentials passing */
245 /* Allow setting readahead and flushing buffers on block devices */
246 /* Allow setting geometry in floppy driver */
247 /* Allow turning DMA on/off in xd driver */
248 /* Allow administration of md devices (mostly the above, but some
249  extra ioctls) */
250 /* Allow tuning the ide driver */
251 /* Allow access to the nvram device */
252 /* Allow administration of apm_bios, serial and bttv (TV) device */
253 /* Allow manufacturer commands in isdn CAPI support driver */
254 /* Allow reading non-standardized portions of pci configuration space */
255 /* Allow DDI debug ioctl on sbpcd driver */
256 /* Allow setting up serial ports */
257 /* Allow sending raw qic-117 commands */
258 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending
259  arbitrary SCSI commands */
260 /* Allow setting encryption key on loopback filesystem */
261 /* Allow setting zone reclaim policy */
262 
263 #define CAP_SYS_ADMIN 21
264 
265 /* Allow use of reboot() */
266 
267 #define CAP_SYS_BOOT 22
268 
269 /* Allow raising priority and setting priority on other (different
270  UID) processes */
271 /* Allow use of FIFO and round-robin (realtime) scheduling on own
272  processes and setting the scheduling algorithm used by another
273  process. */
274 /* Allow setting cpu affinity on other processes */
275 
276 #define CAP_SYS_NICE 23
277 
278 /* Override resource limits. Set resource limits. */
279 /* Override quota limits. */
280 /* Override reserved space on ext2 filesystem */
281 /* Modify data journaling mode on ext3 filesystem (uses journaling
282  resources) */
283 /* NOTE: ext2 honors fsuid when checking for resource overrides, so
284  you can override using fsuid too */
285 /* Override size restrictions on IPC message queues */
286 /* Allow more than 64hz interrupts from the real-time clock */
287 /* Override max number of consoles on console allocation */
288 /* Override max number of keymaps */
289 
290 #define CAP_SYS_RESOURCE 24
291 
292 /* Allow manipulation of system clock */
293 /* Allow irix_stime on mips */
294 /* Allow setting the real-time clock */
295 
296 #define CAP_SYS_TIME 25
297 
298 /* Allow configuration of tty devices */
299 /* Allow vhangup() of tty */
300 
301 #define CAP_SYS_TTY_CONFIG 26
302 
303 /* Allow the privileged aspects of mknod() */
304 
305 #define CAP_MKNOD 27
306 
307 /* Allow taking of leases on files */
308 
309 #define CAP_LEASE 28
310 
311 #define CAP_AUDIT_WRITE 29
312 
313 #define CAP_AUDIT_CONTROL 30
314 
315 #define CAP_SETFCAP 31
316 
317 /* Override MAC access.
318  The base kernel enforces no MAC policy.
319  An LSM may enforce a MAC policy, and if it does and it chooses
320  to implement capability based overrides of that policy, this is
321  the capability it should use to do so. */
322 
323 #define CAP_MAC_OVERRIDE 32
324 
325 /* Allow MAC configuration or state changes.
326  The base kernel requires no MAC configuration.
327  An LSM may enforce a MAC policy, and if it does and it chooses
328  to implement capability based checks on modifications to that
329  policy or the data required to maintain it, this is the
330  capability it should use to do so. */
331 
332 #define CAP_MAC_ADMIN 33
333 
334 /* Allow configuring the kernel's syslog (printk behaviour) */
335 
336 #define CAP_SYSLOG 34
337 
338 /* Allow triggering something that will wake the system */
339 
340 #define CAP_WAKE_ALARM 35
341 
342 /* Allow preventing system suspends */
343 
344 #define CAP_BLOCK_SUSPEND 36
345 
346 #define CAP_LAST_CAP CAP_BLOCK_SUSPEND
347 
348 #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)
349 
350 /*
351  * Bit location of each capability (used by user-space library and kernel)
352  */
353 
354 #define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */
355 #define CAP_TO_MASK(x) (1 << ((x) & 31)) /* mask for indexed __u32 */
356 
357 
358 #endif /* _UAPI_LINUX_CAPABILITY_H */