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Linux/include/uapi/linux/capability.h

  1 /*
  2  * This is <linux/capability.h>
  3  *
  4  * Andrew G. Morgan <morgan@kernel.org>
  5  * Alexander Kjeldaas <astor@guardian.no>
  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 {
 41         __u32 version;
 42         int pid;
 43 } __user *cap_user_header_t;
 44 
 45 typedef struct __user_cap_data_struct {
 46         __u32 effective;
 47         __u32 permitted;
 48         __u32 inheritable;
 49 } __user *cap_user_data_t;
 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 
 90 /**
 91  ** POSIX-draft defined capabilities.
 92  **/
 93 
 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 
145 /**
146  ** Linux-specific capabilities
147  **/
148 
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 /* Allow writing the audit log via unicast netlink socket */
312 
313 #define CAP_AUDIT_WRITE      29
314 
315 /* Allow configuration of audit via unicast netlink socket */
316 
317 #define CAP_AUDIT_CONTROL    30
318 
319 #define CAP_SETFCAP          31
320 
321 /* Override MAC access.
322    The base kernel enforces no MAC policy.
323    An LSM may enforce a MAC policy, and if it does and it chooses
324    to implement capability based overrides of that policy, this is
325    the capability it should use to do so. */
326 
327 #define CAP_MAC_OVERRIDE     32
328 
329 /* Allow MAC configuration or state changes.
330    The base kernel requires no MAC configuration.
331    An LSM may enforce a MAC policy, and if it does and it chooses
332    to implement capability based checks on modifications to that
333    policy or the data required to maintain it, this is the
334    capability it should use to do so. */
335 
336 #define CAP_MAC_ADMIN        33
337 
338 /* Allow configuring the kernel's syslog (printk behaviour) */
339 
340 #define CAP_SYSLOG           34
341 
342 /* Allow triggering something that will wake the system */
343 
344 #define CAP_WAKE_ALARM            35
345 
346 /* Allow preventing system suspends */
347 
348 #define CAP_BLOCK_SUSPEND    36
349 
350 /* Allow reading the audit log via multicast netlink socket */
351 
352 #define CAP_AUDIT_READ          37
353 
354 
355 #define CAP_LAST_CAP         CAP_AUDIT_READ
356 
357 #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)
358 
359 /*
360  * Bit location of each capability (used by user-space library and kernel)
361  */
362 
363 #define CAP_TO_INDEX(x)     ((x) >> 5)        /* 1 << 5 == bits in __u32 */
364 #define CAP_TO_MASK(x)      (1 << ((x) & 31)) /* mask for indexed __u32 */
365 
366 
367 #endif /* _UAPI_LINUX_CAPABILITY_H */
368 

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