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1da177e4 LT |
1 | /* |
2 | * This is <linux/capability.h> | |
3 | * | |
b5376771 | 4 | * Andrew G. Morgan <morgan@kernel.org> |
1da177e4 LT |
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 | * | |
b5376771 SH |
10 | * ftp://linux.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/ |
11 | */ | |
1da177e4 LT |
12 | |
13 | #ifndef _LINUX_CAPABILITY_H | |
14 | #define _LINUX_CAPABILITY_H | |
15 | ||
16 | #include <linux/types.h> | |
17 | #include <linux/compiler.h> | |
18 | ||
b7add02d AM |
19 | struct task_struct; |
20 | ||
1da177e4 LT |
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.. */ | |
b5376771 | 31 | |
1da177e4 LT |
32 | #define _LINUX_CAPABILITY_VERSION 0x19980330 |
33 | ||
34 | typedef struct __user_cap_header_struct { | |
35 | __u32 version; | |
36 | int pid; | |
37 | } __user *cap_user_header_t; | |
b5376771 | 38 | |
1da177e4 LT |
39 | typedef struct __user_cap_data_struct { |
40 | __u32 effective; | |
41 | __u32 permitted; | |
42 | __u32 inheritable; | |
43 | } __user *cap_user_data_t; | |
1da177e4 | 44 | |
b5376771 SH |
45 | #define XATTR_CAPS_SUFFIX "capability" |
46 | #define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX | |
47 | ||
48 | #define XATTR_CAPS_SZ (3*sizeof(__le32)) | |
49 | #define VFS_CAP_REVISION_MASK 0xFF000000 | |
50 | #define VFS_CAP_REVISION_1 0x01000000 | |
51 | ||
52 | #define VFS_CAP_REVISION VFS_CAP_REVISION_1 | |
53 | ||
54 | #define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK | |
55 | #define VFS_CAP_FLAGS_EFFECTIVE 0x000001 | |
56 | ||
57 | struct vfs_cap_data { | |
58 | __u32 magic_etc; /* Little endian */ | |
b68680e4 SH |
59 | __u32 permitted; /* Little endian */ |
60 | __u32 inheritable; /* Little endian */ | |
b5376771 SH |
61 | }; |
62 | ||
63 | #ifdef __KERNEL__ | |
1da177e4 LT |
64 | |
65 | /* #define STRICT_CAP_T_TYPECHECKS */ | |
66 | ||
67 | #ifdef STRICT_CAP_T_TYPECHECKS | |
68 | ||
69 | typedef struct kernel_cap_struct { | |
70 | __u32 cap; | |
71 | } kernel_cap_t; | |
72 | ||
73 | #else | |
74 | ||
75 | typedef __u32 kernel_cap_t; | |
76 | ||
77 | #endif | |
b5376771 | 78 | |
1da177e4 LT |
79 | #define _USER_CAP_HEADER_SIZE (2*sizeof(__u32)) |
80 | #define _KERNEL_CAP_T_SIZE (sizeof(kernel_cap_t)) | |
81 | ||
82 | #endif | |
83 | ||
84 | ||
85 | /** | |
b5376771 | 86 | ** POSIX-draft defined capabilities. |
1da177e4 LT |
87 | **/ |
88 | ||
89 | /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this | |
90 | overrides the restriction of changing file ownership and group | |
91 | ownership. */ | |
92 | ||
93 | #define CAP_CHOWN 0 | |
94 | ||
95 | /* Override all DAC access, including ACL execute access if | |
96 | [_POSIX_ACL] is defined. Excluding DAC access covered by | |
97 | CAP_LINUX_IMMUTABLE. */ | |
98 | ||
99 | #define CAP_DAC_OVERRIDE 1 | |
100 | ||
101 | /* Overrides all DAC restrictions regarding read and search on files | |
102 | and directories, including ACL restrictions if [_POSIX_ACL] is | |
103 | defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */ | |
104 | ||
105 | #define CAP_DAC_READ_SEARCH 2 | |
b5376771 | 106 | |
1da177e4 LT |
107 | /* Overrides all restrictions about allowed operations on files, where |
108 | file owner ID must be equal to the user ID, except where CAP_FSETID | |
109 | is applicable. It doesn't override MAC and DAC restrictions. */ | |
110 | ||
111 | #define CAP_FOWNER 3 | |
112 | ||
113 | /* Overrides the following restrictions that the effective user ID | |
114 | shall match the file owner ID when setting the S_ISUID and S_ISGID | |
115 | bits on that file; that the effective group ID (or one of the | |
116 | supplementary group IDs) shall match the file owner ID when setting | |
117 | the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are | |
118 | cleared on successful return from chown(2) (not implemented). */ | |
119 | ||
120 | #define CAP_FSETID 4 | |
121 | ||
122 | /* Used to decide between falling back on the old suser() or fsuser(). */ | |
123 | ||
124 | #define CAP_FS_MASK 0x1f | |
125 | ||
126 | /* Overrides the restriction that the real or effective user ID of a | |
127 | process sending a signal must match the real or effective user ID | |
128 | of the process receiving the signal. */ | |
129 | ||
130 | #define CAP_KILL 5 | |
131 | ||
132 | /* Allows setgid(2) manipulation */ | |
133 | /* Allows setgroups(2) */ | |
134 | /* Allows forged gids on socket credentials passing. */ | |
135 | ||
136 | #define CAP_SETGID 6 | |
137 | ||
138 | /* Allows set*uid(2) manipulation (including fsuid). */ | |
139 | /* Allows forged pids on socket credentials passing. */ | |
140 | ||
141 | #define CAP_SETUID 7 | |
142 | ||
143 | ||
144 | /** | |
145 | ** Linux-specific capabilities | |
146 | **/ | |
147 | ||
148 | /* Transfer any capability in your permitted set to any pid, | |
149 | remove any capability in your permitted set from any pid */ | |
150 | ||
151 | #define CAP_SETPCAP 8 | |
152 | ||
153 | /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */ | |
154 | ||
155 | #define CAP_LINUX_IMMUTABLE 9 | |
156 | ||
157 | /* Allows binding to TCP/UDP sockets below 1024 */ | |
158 | /* Allows binding to ATM VCIs below 32 */ | |
159 | ||
160 | #define CAP_NET_BIND_SERVICE 10 | |
161 | ||
162 | /* Allow broadcasting, listen to multicast */ | |
163 | ||
164 | #define CAP_NET_BROADCAST 11 | |
165 | ||
166 | /* Allow interface configuration */ | |
167 | /* Allow administration of IP firewall, masquerading and accounting */ | |
168 | /* Allow setting debug option on sockets */ | |
169 | /* Allow modification of routing tables */ | |
170 | /* Allow setting arbitrary process / process group ownership on | |
171 | sockets */ | |
172 | /* Allow binding to any address for transparent proxying */ | |
173 | /* Allow setting TOS (type of service) */ | |
174 | /* Allow setting promiscuous mode */ | |
175 | /* Allow clearing driver statistics */ | |
176 | /* Allow multicasting */ | |
177 | /* Allow read/write of device-specific registers */ | |
178 | /* Allow activation of ATM control sockets */ | |
179 | ||
180 | #define CAP_NET_ADMIN 12 | |
181 | ||
182 | /* Allow use of RAW sockets */ | |
183 | /* Allow use of PACKET sockets */ | |
184 | ||
185 | #define CAP_NET_RAW 13 | |
186 | ||
187 | /* Allow locking of shared memory segments */ | |
188 | /* Allow mlock and mlockall (which doesn't really have anything to do | |
189 | with IPC) */ | |
190 | ||
191 | #define CAP_IPC_LOCK 14 | |
192 | ||
193 | /* Override IPC ownership checks */ | |
194 | ||
195 | #define CAP_IPC_OWNER 15 | |
196 | ||
197 | /* Insert and remove kernel modules - modify kernel without limit */ | |
198 | /* Modify cap_bset */ | |
199 | #define CAP_SYS_MODULE 16 | |
200 | ||
201 | /* Allow ioperm/iopl access */ | |
202 | /* Allow sending USB messages to any device via /proc/bus/usb */ | |
203 | ||
204 | #define CAP_SYS_RAWIO 17 | |
205 | ||
206 | /* Allow use of chroot() */ | |
207 | ||
208 | #define CAP_SYS_CHROOT 18 | |
209 | ||
210 | /* Allow ptrace() of any process */ | |
211 | ||
212 | #define CAP_SYS_PTRACE 19 | |
213 | ||
214 | /* Allow configuration of process accounting */ | |
215 | ||
216 | #define CAP_SYS_PACCT 20 | |
217 | ||
218 | /* Allow configuration of the secure attention key */ | |
219 | /* Allow administration of the random device */ | |
220 | /* Allow examination and configuration of disk quotas */ | |
221 | /* Allow configuring the kernel's syslog (printk behaviour) */ | |
222 | /* Allow setting the domainname */ | |
223 | /* Allow setting the hostname */ | |
224 | /* Allow calling bdflush() */ | |
225 | /* Allow mount() and umount(), setting up new smb connection */ | |
226 | /* Allow some autofs root ioctls */ | |
227 | /* Allow nfsservctl */ | |
228 | /* Allow VM86_REQUEST_IRQ */ | |
229 | /* Allow to read/write pci config on alpha */ | |
230 | /* Allow irix_prctl on mips (setstacksize) */ | |
231 | /* Allow flushing all cache on m68k (sys_cacheflush) */ | |
232 | /* Allow removing semaphores */ | |
233 | /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores | |
234 | and shared memory */ | |
235 | /* Allow locking/unlocking of shared memory segment */ | |
236 | /* Allow turning swap on/off */ | |
237 | /* Allow forged pids on socket credentials passing */ | |
238 | /* Allow setting readahead and flushing buffers on block devices */ | |
239 | /* Allow setting geometry in floppy driver */ | |
240 | /* Allow turning DMA on/off in xd driver */ | |
241 | /* Allow administration of md devices (mostly the above, but some | |
242 | extra ioctls) */ | |
243 | /* Allow tuning the ide driver */ | |
244 | /* Allow access to the nvram device */ | |
245 | /* Allow administration of apm_bios, serial and bttv (TV) device */ | |
246 | /* Allow manufacturer commands in isdn CAPI support driver */ | |
247 | /* Allow reading non-standardized portions of pci configuration space */ | |
248 | /* Allow DDI debug ioctl on sbpcd driver */ | |
249 | /* Allow setting up serial ports */ | |
250 | /* Allow sending raw qic-117 commands */ | |
251 | /* Allow enabling/disabling tagged queuing on SCSI controllers and sending | |
252 | arbitrary SCSI commands */ | |
253 | /* Allow setting encryption key on loopback filesystem */ | |
bce5f6ba | 254 | /* Allow setting zone reclaim policy */ |
1da177e4 LT |
255 | |
256 | #define CAP_SYS_ADMIN 21 | |
257 | ||
258 | /* Allow use of reboot() */ | |
259 | ||
260 | #define CAP_SYS_BOOT 22 | |
261 | ||
262 | /* Allow raising priority and setting priority on other (different | |
263 | UID) processes */ | |
264 | /* Allow use of FIFO and round-robin (realtime) scheduling on own | |
265 | processes and setting the scheduling algorithm used by another | |
266 | process. */ | |
267 | /* Allow setting cpu affinity on other processes */ | |
268 | ||
269 | #define CAP_SYS_NICE 23 | |
270 | ||
271 | /* Override resource limits. Set resource limits. */ | |
272 | /* Override quota limits. */ | |
273 | /* Override reserved space on ext2 filesystem */ | |
274 | /* Modify data journaling mode on ext3 filesystem (uses journaling | |
275 | resources) */ | |
b5376771 | 276 | /* NOTE: ext2 honors fsuid when checking for resource overrides, so |
1da177e4 LT |
277 | you can override using fsuid too */ |
278 | /* Override size restrictions on IPC message queues */ | |
279 | /* Allow more than 64hz interrupts from the real-time clock */ | |
280 | /* Override max number of consoles on console allocation */ | |
281 | /* Override max number of keymaps */ | |
282 | ||
283 | #define CAP_SYS_RESOURCE 24 | |
284 | ||
285 | /* Allow manipulation of system clock */ | |
286 | /* Allow irix_stime on mips */ | |
287 | /* Allow setting the real-time clock */ | |
288 | ||
289 | #define CAP_SYS_TIME 25 | |
290 | ||
291 | /* Allow configuration of tty devices */ | |
292 | /* Allow vhangup() of tty */ | |
293 | ||
294 | #define CAP_SYS_TTY_CONFIG 26 | |
295 | ||
296 | /* Allow the privileged aspects of mknod() */ | |
297 | ||
298 | #define CAP_MKNOD 27 | |
299 | ||
300 | /* Allow taking of leases on files */ | |
301 | ||
302 | #define CAP_LEASE 28 | |
303 | ||
304 | #define CAP_AUDIT_WRITE 29 | |
305 | ||
306 | #define CAP_AUDIT_CONTROL 30 | |
307 | ||
b5376771 SH |
308 | #define CAP_SETFCAP 31 |
309 | ||
1da177e4 | 310 | #ifdef __KERNEL__ |
1da177e4 LT |
311 | |
312 | /* | |
313 | * Internal kernel functions only | |
314 | */ | |
b5376771 | 315 | |
1da177e4 LT |
316 | #ifdef STRICT_CAP_T_TYPECHECKS |
317 | ||
318 | #define to_cap_t(x) { x } | |
319 | #define cap_t(x) (x).cap | |
320 | ||
321 | #else | |
322 | ||
323 | #define to_cap_t(x) (x) | |
324 | #define cap_t(x) (x) | |
325 | ||
326 | #endif | |
327 | ||
328 | #define CAP_EMPTY_SET to_cap_t(0) | |
329 | #define CAP_FULL_SET to_cap_t(~0) | |
330 | #define CAP_INIT_EFF_SET to_cap_t(~0 & ~CAP_TO_MASK(CAP_SETPCAP)) | |
331 | #define CAP_INIT_INH_SET to_cap_t(0) | |
332 | ||
333 | #define CAP_TO_MASK(x) (1 << (x)) | |
334 | #define cap_raise(c, flag) (cap_t(c) |= CAP_TO_MASK(flag)) | |
335 | #define cap_lower(c, flag) (cap_t(c) &= ~CAP_TO_MASK(flag)) | |
336 | #define cap_raised(c, flag) (cap_t(c) & CAP_TO_MASK(flag)) | |
337 | ||
338 | static inline kernel_cap_t cap_combine(kernel_cap_t a, kernel_cap_t b) | |
339 | { | |
340 | kernel_cap_t dest; | |
341 | cap_t(dest) = cap_t(a) | cap_t(b); | |
342 | return dest; | |
343 | } | |
344 | ||
345 | static inline kernel_cap_t cap_intersect(kernel_cap_t a, kernel_cap_t b) | |
346 | { | |
347 | kernel_cap_t dest; | |
348 | cap_t(dest) = cap_t(a) & cap_t(b); | |
349 | return dest; | |
350 | } | |
351 | ||
352 | static inline kernel_cap_t cap_drop(kernel_cap_t a, kernel_cap_t drop) | |
353 | { | |
354 | kernel_cap_t dest; | |
355 | cap_t(dest) = cap_t(a) & ~cap_t(drop); | |
356 | return dest; | |
357 | } | |
358 | ||
359 | static inline kernel_cap_t cap_invert(kernel_cap_t c) | |
360 | { | |
361 | kernel_cap_t dest; | |
362 | cap_t(dest) = ~cap_t(c); | |
363 | return dest; | |
364 | } | |
365 | ||
366 | #define cap_isclear(c) (!cap_t(c)) | |
367 | #define cap_issubset(a,set) (!(cap_t(a) & ~cap_t(set))) | |
368 | ||
369 | #define cap_clear(c) do { cap_t(c) = 0; } while(0) | |
370 | #define cap_set_full(c) do { cap_t(c) = ~0; } while(0) | |
371 | #define cap_mask(c,mask) do { cap_t(c) &= cap_t(mask); } while(0) | |
372 | ||
373 | #define cap_is_fs_cap(c) (CAP_TO_MASK(c) & CAP_FS_MASK) | |
374 | ||
12b5989b CW |
375 | int capable(int cap); |
376 | int __capable(struct task_struct *t, int cap); | |
c59ede7b | 377 | |
1da177e4 LT |
378 | #endif /* __KERNEL__ */ |
379 | ||
380 | #endif /* !_LINUX_CAPABILITY_H */ |