1 /*
2 * This is <linux/capability.h>
3 *
4 * Andrew G. Morgan <morgan@transmeta.com>
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://linux.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.2/
11 */
12
13 #ifndef _LINUX_CAPABILITY_H
14 #define _LINUX_CAPABILITY_H
15
16 #include <linux/types.h>
17 #include <linux/compiler.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 /* XXX - Note, cap_t, is defined by POSIX 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 0x19980330
31
32 typedef struct __user_cap_header_struct {
33 __u32 version;
34 int pid;
35 } __user *cap_user_header_t;
36
37 typedef struct __user_cap_data_struct {
38 __u32 effective;
39 __u32 permitted;
40 __u32 inheritable;
41 } __user *cap_user_data_t;
42
43 #ifdef __KERNEL__
44
45 #include <linux/spinlock.h>
46 #include <asm/current.h>
47
48 /* #define STRICT_CAP_T_TYPECHECKS */
49
50 #ifdef STRICT_CAP_T_TYPECHECKS
51
52 typedef struct kernel_cap_struct {
53 __u32 cap;
54 } kernel_cap_t;
55
56 #else
57
58 typedef __u32 kernel_cap_t;
59
60 #endif
61
62 #define _USER_CAP_HEADER_SIZE (2*sizeof(__u32))
63 #define _KERNEL_CAP_T_SIZE (sizeof(kernel_cap_t))
64
65 #endif
66
67
68 /**
69 ** POSIX-draft defined capabilities.
70 **/
71
72 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
73 overrides the restriction of changing file ownership and group
74 ownership. */
75
76 #define CAP_CHOWN 0
77
78 /* Override all DAC access, including ACL execute access if
79 [_POSIX_ACL] is defined. Excluding DAC access covered by
80 CAP_LINUX_IMMUTABLE. */
81
82 #define CAP_DAC_OVERRIDE 1
83
84 /* Overrides all DAC restrictions regarding read and search on files
85 and directories, including ACL restrictions if [_POSIX_ACL] is
86 defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
87
88 #define CAP_DAC_READ_SEARCH 2
89
90 /* Overrides all restrictions about allowed operations on files, where
91 file owner ID must be equal to the user ID, except where CAP_FSETID
92 is applicable. It doesn't override MAC and DAC restrictions. */
93
94 #define CAP_FOWNER 3
95
96 /* Overrides the following restrictions that the effective user ID
97 shall match the file owner ID when setting the S_ISUID and S_ISGID
98 bits on that file; that the effective group ID (or one of the
99 supplementary group IDs) shall match the file owner ID when setting
100 the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
101 cleared on successful return from chown(2) (not implemented). */
102
103 #define CAP_FSETID 4
104
105 /* Used to decide between falling back on the old suser() or fsuser(). */
106
107 #define CAP_FS_MASK 0x1f
108
109 /* Overrides the restriction that the real or effective user ID of a
110 process sending a signal must match the real or effective user ID
111 of the process receiving the signal. */
112
113 #define CAP_KILL 5
114
115 /* Allows setgid(2) manipulation */
116 /* Allows setgroups(2) */
117 /* Allows forged gids on socket credentials passing. */
118
119 #define CAP_SETGID 6
120
121 /* Allows set*uid(2) manipulation (including fsuid). */
122 /* Allows forged pids on socket credentials passing. */
123
124 #define CAP_SETUID 7
125
126
127 /**
128 ** Linux-specific capabilities
129 **/
130
131 /* Transfer any capability in your permitted set to any pid,
132 remove any capability in your permitted set from any pid */
133
134 #define CAP_SETPCAP 8
135
136 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
137
138 #define CAP_LINUX_IMMUTABLE 9
139
140 /* Allows binding to TCP/UDP sockets below 1024 */
141 /* Allows binding to ATM VCIs below 32 */
142
143 #define CAP_NET_BIND_SERVICE 10
144
145 /* Allow broadcasting, listen to multicast */
146
147 #define CAP_NET_BROADCAST 11
148
149 /* Allow interface configuration */
150 /* Allow administration of IP firewall, masquerading and accounting */
151 /* Allow setting debug option on sockets */
152 /* Allow modification of routing tables */
153 /* Allow setting arbitrary process / process group ownership on
154 sockets */
155 /* Allow binding to any address for transparent proxying */
156 /* Allow setting TOS (type of service) */
157 /* Allow setting promiscuous mode */
158 /* Allow clearing driver statistics */
159 /* Allow multicasting */
160 /* Allow read/write of device-specific registers */
161 /* Allow activation of ATM control sockets */
162
163 #define CAP_NET_ADMIN 12
164
165 /* Allow use of RAW sockets */
166 /* Allow use of PACKET sockets */
167
168 #define CAP_NET_RAW 13
169
170 /* Allow locking of shared memory segments */
171 /* Allow mlock and mlockall (which doesn't really have anything to do
172 with IPC) */
173
174 #define CAP_IPC_LOCK 14
175
176 /* Override IPC ownership checks */
177
178 #define CAP_IPC_OWNER 15
179
180 /* Insert and remove kernel modules - modify kernel without limit */
181 /* Modify cap_bset */
182 #define CAP_SYS_MODULE 16
183
184 /* Allow ioperm/iopl access */
185 /* Allow sending USB messages to any device via /proc/bus/usb */
186
187 #define CAP_SYS_RAWIO 17
188
189 /* Allow use of chroot() */
190
191 #define CAP_SYS_CHROOT 18
192
193 /* Allow ptrace() of any process */
194
195 #define CAP_SYS_PTRACE 19
196
197 /* Allow configuration of process accounting */
198
199 #define CAP_SYS_PACCT 20
200
201 /* Allow configuration of the secure attention key */
202 /* Allow administration of the random device */
203 /* Allow examination and configuration of disk quotas */
204 /* Allow configuring the kernel's syslog (printk behaviour) */
205 /* Allow setting the domainname */
206 /* Allow setting the hostname */
207 /* Allow calling bdflush() */
208 /* Allow mount() and umount(), setting up new smb connection */
209 /* Allow some autofs root ioctls */
210 /* Allow nfsservctl */
211 /* Allow VM86_REQUEST_IRQ */
212 /* Allow to read/write pci config on alpha */
213 /* Allow irix_prctl on mips (setstacksize) */
214 /* Allow flushing all cache on m68k (sys_cacheflush) */
215 /* Allow removing semaphores */
216 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
217 and shared memory */
218 /* Allow locking/unlocking of shared memory segment */
219 /* Allow turning swap on/off */
220 /* Allow forged pids on socket credentials passing */
221 /* Allow setting readahead and flushing buffers on block devices */
222 /* Allow setting geometry in floppy driver */
223 /* Allow turning DMA on/off in xd driver */
224 /* Allow administration of md devices (mostly the above, but some
225 extra ioctls) */
226 /* Allow tuning the ide driver */
227 /* Allow access to the nvram device */
228 /* Allow administration of apm_bios, serial and bttv (TV) device */
229 /* Allow manufacturer commands in isdn CAPI support driver */
230 /* Allow reading non-standardized portions of pci configuration space */
231 /* Allow DDI debug ioctl on sbpcd driver */
232 /* Allow setting up serial ports */
233 /* Allow sending raw qic-117 commands */
234 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending
235 arbitrary SCSI commands */
236 /* Allow setting encryption key on loopback filesystem */
237 /* Allow setting zone reclaim policy */
238
239 #define CAP_SYS_ADMIN 21
240
241 /* Allow use of reboot() */
242
243 #define CAP_SYS_BOOT 22
244
245 /* Allow raising priority and setting priority on other (different
246 UID) processes */
247 /* Allow use of FIFO and round-robin (realtime) scheduling on own
248 processes and setting the scheduling algorithm used by another
249 process. */
250 /* Allow setting cpu affinity on other processes */
251
252 #define CAP_SYS_NICE 23
253
254 /* Override resource limits. Set resource limits. */
255 /* Override quota limits. */
256 /* Override reserved space on ext2 filesystem */
257 /* Modify data journaling mode on ext3 filesystem (uses journaling
258 resources) */
259 /* NOTE: ext2 honors fsuid when checking for resource overrides, so
260 you can override using fsuid too */
261 /* Override size restrictions on IPC message queues */
262 /* Allow more than 64hz interrupts from the real-time clock */
263 /* Override max number of consoles on console allocation */
264 /* Override max number of keymaps */
265
266 #define CAP_SYS_RESOURCE 24
267
268 /* Allow manipulation of system clock */
269 /* Allow irix_stime on mips */
270 /* Allow setting the real-time clock */
271
272 #define CAP_SYS_TIME 25
273
274 /* Allow configuration of tty devices */
275 /* Allow vhangup() of tty */
276
277 #define CAP_SYS_TTY_CONFIG 26
278
279 /* Allow the privileged aspects of mknod() */
280
281 #define CAP_MKNOD 27
282
283 /* Allow taking of leases on files */
284
285 #define CAP_LEASE 28
286
287 #define CAP_AUDIT_WRITE 29
288
289 #define CAP_AUDIT_CONTROL 30
290
291 #ifdef __KERNEL__
292 /*
293 * Bounding set
294 */
295 extern kernel_cap_t cap_bset;
296
297 /*
298 * Internal kernel functions only
299 */
300
301 #ifdef STRICT_CAP_T_TYPECHECKS
302
303 #define to_cap_t(x) { x }
304 #define cap_t(x) (x).cap
305
306 #else
307
308 #define to_cap_t(x) (x)
309 #define cap_t(x) (x)
310
311 #endif
312
313 #define CAP_EMPTY_SET to_cap_t(0)
314 #define CAP_FULL_SET to_cap_t(~0)
315 #define CAP_INIT_EFF_SET to_cap_t(~0 & ~CAP_TO_MASK(CAP_SETPCAP))
316 #define CAP_INIT_INH_SET to_cap_t(0)
317
318 #define CAP_TO_MASK(x) (1 << (x))
319 #define cap_raise(c, flag) (cap_t(c) |= CAP_TO_MASK(flag))
320 #define cap_lower(c, flag) (cap_t(c) &= ~CAP_TO_MASK(flag))
321 #define cap_raised(c, flag) (cap_t(c) & CAP_TO_MASK(flag))
322
cap_combine(kernel_cap_t a,kernel_cap_t b)323 static inline kernel_cap_t cap_combine(kernel_cap_t a, kernel_cap_t b)
324 {
325 kernel_cap_t dest;
326 cap_t(dest) = cap_t(a) | cap_t(b);
327 return dest;
328 }
329
cap_intersect(kernel_cap_t a,kernel_cap_t b)330 static inline kernel_cap_t cap_intersect(kernel_cap_t a, kernel_cap_t b)
331 {
332 kernel_cap_t dest;
333 cap_t(dest) = cap_t(a) & cap_t(b);
334 return dest;
335 }
336
cap_drop(kernel_cap_t a,kernel_cap_t drop)337 static inline kernel_cap_t cap_drop(kernel_cap_t a, kernel_cap_t drop)
338 {
339 kernel_cap_t dest;
340 cap_t(dest) = cap_t(a) & ~cap_t(drop);
341 return dest;
342 }
343
cap_invert(kernel_cap_t c)344 static inline kernel_cap_t cap_invert(kernel_cap_t c)
345 {
346 kernel_cap_t dest;
347 cap_t(dest) = ~cap_t(c);
348 return dest;
349 }
350
351 #define cap_isclear(c) (!cap_t(c))
352 #define cap_issubset(a,set) (!(cap_t(a) & ~cap_t(set)))
353
354 #define cap_clear(c) do { cap_t(c) = 0; } while(0)
355 #define cap_set_full(c) do { cap_t(c) = ~0; } while(0)
356 #define cap_mask(c,mask) do { cap_t(c) &= cap_t(mask); } while(0)
357
358 #define cap_is_fs_cap(c) (CAP_TO_MASK(c) & CAP_FS_MASK)
359
360 int capable(int cap);
361 int __capable(struct task_struct *t, int cap);
362
363 #endif /* __KERNEL__ */
364
365 #endif /* !_LINUX_CAPABILITY_H */
366