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