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