1 /* 2 * This is <linux/capability.h> 3 * 4 * Andrew G. Morgan <[email protected]> 5 * Alexander Kjeldaas <[email protected]> 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-2.6/ 11 */ 12 13 #ifndef _LINUX_CAPABILITY_H 14 #define _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 35 #define _LINUX_CAPABILITY_U32S_2 2 36 37 #define _LINUX_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_2 38 #define _LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_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 XATTR_CAPS_SUFFIX "capability" 53 #define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX 54 55 #define VFS_CAP_REVISION_MASK 0xFF000000 56 #define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK 57 #define VFS_CAP_FLAGS_EFFECTIVE 0x000001 58 59 #define VFS_CAP_REVISION_1 0x01000000 60 #define VFS_CAP_U32_1 1 61 #define XATTR_CAPS_SZ_1 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1)) 62 63 #define VFS_CAP_REVISION_2 0x02000000 64 #define VFS_CAP_U32_2 2 65 #define XATTR_CAPS_SZ_2 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2)) 66 67 #define XATTR_CAPS_SZ XATTR_CAPS_SZ_2 68 #define VFS_CAP_U32 VFS_CAP_U32_2 69 #define VFS_CAP_REVISION VFS_CAP_REVISION_2 70 71 72 struct vfs_cap_data { 73 __le32 magic_etc; /* Little endian */ 74 struct { 75 __le32 permitted; /* Little endian */ 76 __le32 inheritable; /* Little endian */ 77 } data[VFS_CAP_U32]; 78 }; 79 80 #ifdef __KERNEL__ 81 82 typedef struct kernel_cap_struct { 83 __u32 cap[_LINUX_CAPABILITY_U32S]; 84 } kernel_cap_t; 85 86 #define _USER_CAP_HEADER_SIZE (sizeof(struct __user_cap_header_struct)) 87 #define _KERNEL_CAP_T_SIZE (sizeof(kernel_cap_t)) 88 89 #endif 90 91 92 /** 93 ** POSIX-draft defined capabilities. 94 **/ 95 96 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this 97 overrides the restriction of changing file ownership and group 98 ownership. */ 99 100 #define CAP_CHOWN 0 101 102 /* Override all DAC access, including ACL execute access if 103 [_POSIX_ACL] is defined. Excluding DAC access covered by 104 CAP_LINUX_IMMUTABLE. */ 105 106 #define CAP_DAC_OVERRIDE 1 107 108 /* Overrides all DAC restrictions regarding read and search on files 109 and directories, including ACL restrictions if [_POSIX_ACL] is 110 defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */ 111 112 #define CAP_DAC_READ_SEARCH 2 113 114 /* Overrides all restrictions about allowed operations on files, where 115 file owner ID must be equal to the user ID, except where CAP_FSETID 116 is applicable. It doesn't override MAC and DAC restrictions. */ 117 118 #define CAP_FOWNER 3 119 120 /* Overrides the following restrictions that the effective user ID 121 shall match the file owner ID when setting the S_ISUID and S_ISGID 122 bits on that file; that the effective group ID (or one of the 123 supplementary group IDs) shall match the file owner ID when setting 124 the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are 125 cleared on successful return from chown(2) (not implemented). */ 126 127 #define CAP_FSETID 4 128 129 /* Overrides the restriction that the real or effective user ID of a 130 process sending a signal must match the real or effective user ID 131 of the process receiving the signal. */ 132 133 #define CAP_KILL 5 134 135 /* Allows setgid(2) manipulation */ 136 /* Allows setgroups(2) */ 137 /* Allows forged gids on socket credentials passing. */ 138 139 #define CAP_SETGID 6 140 141 /* Allows set*uid(2) manipulation (including fsuid). */ 142 /* Allows forged pids on socket credentials passing. */ 143 144 #define CAP_SETUID 7 145 146 147 /** 148 ** Linux-specific capabilities 149 **/ 150 151 /* Without VFS support for capabilities: 152 * Transfer any capability in your permitted set to any pid, 153 * remove any capability in your permitted set from any pid 154 * With VFS support for capabilities (neither of above, but) 155 * Add any capability from current's capability bounding set 156 * to the current process' inheritable set 157 * Allow taking bits out of capability bounding set 158 * Allow modification of the securebits for a process 159 */ 160 161 #define CAP_SETPCAP 8 162 163 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */ 164 165 #define CAP_LINUX_IMMUTABLE 9 166 167 /* Allows binding to TCP/UDP sockets below 1024 */ 168 /* Allows binding to ATM VCIs below 32 */ 169 170 #define CAP_NET_BIND_SERVICE 10 171 172 /* Allow broadcasting, listen to multicast */ 173 174 #define CAP_NET_BROADCAST 11 175 176 /* Allow interface configuration */ 177 /* Allow administration of IP firewall, masquerading and accounting */ 178 /* Allow setting debug option on sockets */ 179 /* Allow modification of routing tables */ 180 /* Allow setting arbitrary process / process group ownership on 181 sockets */ 182 /* Allow binding to any address for transparent proxying */ 183 /* Allow setting TOS (type of service) */ 184 /* Allow setting promiscuous mode */ 185 /* Allow clearing driver statistics */ 186 /* Allow multicasting */ 187 /* Allow read/write of device-specific registers */ 188 /* Allow activation of ATM control sockets */ 189 190 #define CAP_NET_ADMIN 12 191 192 /* Allow use of RAW sockets */ 193 /* Allow use of PACKET sockets */ 194 195 #define CAP_NET_RAW 13 196 197 /* Allow locking of shared memory segments */ 198 /* Allow mlock and mlockall (which doesn't really have anything to do 199 with IPC) */ 200 201 #define CAP_IPC_LOCK 14 202 203 /* Override IPC ownership checks */ 204 205 #define CAP_IPC_OWNER 15 206 207 /* Insert and remove kernel modules - modify kernel without limit */ 208 #define CAP_SYS_MODULE 16 209 210 /* Allow ioperm/iopl access */ 211 /* Allow sending USB messages to any device via /proc/bus/usb */ 212 213 #define CAP_SYS_RAWIO 17 214 215 /* Allow use of chroot() */ 216 217 #define CAP_SYS_CHROOT 18 218 219 /* Allow ptrace() of any process */ 220 221 #define CAP_SYS_PTRACE 19 222 223 /* Allow configuration of process accounting */ 224 225 #define CAP_SYS_PACCT 20 226 227 /* Allow configuration of the secure attention key */ 228 /* Allow administration of the random device */ 229 /* Allow examination and configuration of disk quotas */ 230 /* Allow configuring the kernel's syslog (printk behaviour) */ 231 /* Allow setting the domainname */ 232 /* Allow setting the hostname */ 233 /* Allow calling bdflush() */ 234 /* Allow mount() and umount(), setting up new smb connection */ 235 /* Allow some autofs root ioctls */ 236 /* Allow nfsservctl */ 237 /* Allow VM86_REQUEST_IRQ */ 238 /* Allow to read/write pci config on alpha */ 239 /* Allow irix_prctl on mips (setstacksize) */ 240 /* Allow flushing all cache on m68k (sys_cacheflush) */ 241 /* Allow removing semaphores */ 242 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores 243 and shared memory */ 244 /* Allow locking/unlocking of shared memory segment */ 245 /* Allow turning swap on/off */ 246 /* Allow forged pids on socket credentials passing */ 247 /* Allow setting readahead and flushing buffers on block devices */ 248 /* Allow setting geometry in floppy driver */ 249 /* Allow turning DMA on/off in xd driver */ 250 /* Allow administration of md devices (mostly the above, but some 251 extra ioctls) */ 252 /* Allow tuning the ide driver */ 253 /* Allow access to the nvram device */ 254 /* Allow administration of apm_bios, serial and bttv (TV) device */ 255 /* Allow manufacturer commands in isdn CAPI support driver */ 256 /* Allow reading non-standardized portions of pci configuration space */ 257 /* Allow DDI debug ioctl on sbpcd driver */ 258 /* Allow setting up serial ports */ 259 /* Allow sending raw qic-117 commands */ 260 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending 261 arbitrary SCSI commands */ 262 /* Allow setting encryption key on loopback filesystem */ 263 /* Allow setting zone reclaim policy */ 264 265 #define CAP_SYS_ADMIN 21 266 267 /* Allow use of reboot() */ 268 269 #define CAP_SYS_BOOT 22 270 271 /* Allow raising priority and setting priority on other (different 272 UID) processes */ 273 /* Allow use of FIFO and round-robin (realtime) scheduling on own 274 processes and setting the scheduling algorithm used by another 275 process. */ 276 /* Allow setting cpu affinity on other processes */ 277 278 #define CAP_SYS_NICE 23 279 280 /* Override resource limits. Set resource limits. */ 281 /* Override quota limits. */ 282 /* Override reserved space on ext2 filesystem */ 283 /* Modify data journaling mode on ext3 filesystem (uses journaling 284 resources) */ 285 /* NOTE: ext2 honors fsuid when checking for resource overrides, so 286 you can override using fsuid too */ 287 /* Override size restrictions on IPC message queues */ 288 /* Allow more than 64hz interrupts from the real-time clock */ 289 /* Override max number of consoles on console allocation */ 290 /* Override max number of keymaps */ 291 292 #define CAP_SYS_RESOURCE 24 293 294 /* Allow manipulation of system clock */ 295 /* Allow irix_stime on mips */ 296 /* Allow setting the real-time clock */ 297 298 #define CAP_SYS_TIME 25 299 300 /* Allow configuration of tty devices */ 301 /* Allow vhangup() of tty */ 302 303 #define CAP_SYS_TTY_CONFIG 26 304 305 /* Allow the privileged aspects of mknod() */ 306 307 #define CAP_MKNOD 27 308 309 /* Allow taking of leases on files */ 310 311 #define CAP_LEASE 28 312 313 #define CAP_AUDIT_WRITE 29 314 315 #define CAP_AUDIT_CONTROL 30 316 317 #define CAP_SETFCAP 31 318 319 /* Override MAC access. 320 The base kernel enforces no MAC policy. 321 An LSM may enforce a MAC policy, and if it does and it chooses 322 to implement capability based overrides of that policy, this is 323 the capability it should use to do so. */ 324 325 #define CAP_MAC_OVERRIDE 32 326 327 /* Allow MAC configuration or state changes. 328 The base kernel requires no MAC configuration. 329 An LSM may enforce a MAC policy, and if it does and it chooses 330 to implement capability based checks on modifications to that 331 policy or the data required to maintain it, this is the 332 capability it should use to do so. */ 333 334 #define CAP_MAC_ADMIN 33 335 336 #define CAP_LAST_CAP CAP_MAC_ADMIN 337 338 #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP) 339 340 /* 341 * Bit location of each capability (used by user-space library and kernel) 342 */ 343 344 #define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */ 345 #define CAP_TO_MASK(x) (1 << ((x) & 31)) /* mask for indexed __u32 */ 346 347 #ifdef __KERNEL__ 348 349 /* 350 * Internal kernel functions only 351 */ 352 353 #define CAP_FOR_EACH_U32(__capi) \ 354 for (__capi = 0; __capi < _LINUX_CAPABILITY_U32S; ++__capi) 355 356 # define CAP_FS_MASK_B0 (CAP_TO_MASK(CAP_CHOWN) \ 357 | CAP_TO_MASK(CAP_DAC_OVERRIDE) \ 358 | CAP_TO_MASK(CAP_DAC_READ_SEARCH) \ 359 | CAP_TO_MASK(CAP_FOWNER) \ 360 | CAP_TO_MASK(CAP_FSETID)) 361 362 # define CAP_FS_MASK_B1 (CAP_TO_MASK(CAP_MAC_OVERRIDE)) 363 364 #if _LINUX_CAPABILITY_U32S != 2 365 # error Fix up hand-coded capability macro initializers 366 #else /* HAND-CODED capability initializers */ 367 368 # define CAP_EMPTY_SET ((kernel_cap_t){{ 0, 0 }}) 369 # define CAP_FULL_SET ((kernel_cap_t){{ ~0, ~0 }}) 370 # define CAP_INIT_EFF_SET ((kernel_cap_t){{ ~CAP_TO_MASK(CAP_SETPCAP), ~0 }}) 371 # define CAP_FS_SET ((kernel_cap_t){{ CAP_FS_MASK_B0, CAP_FS_MASK_B1 } }) 372 # define CAP_NFSD_SET ((kernel_cap_t){{ CAP_FS_MASK_B0|CAP_TO_MASK(CAP_SYS_RESOURCE), \ 373 CAP_FS_MASK_B1 } }) 374 375 #endif /* _LINUX_CAPABILITY_U32S != 2 */ 376 377 #define CAP_INIT_INH_SET CAP_EMPTY_SET 378 379 # define cap_clear(c) do { (c) = __cap_empty_set; } while (0) 380 # define cap_set_full(c) do { (c) = __cap_full_set; } while (0) 381 # define cap_set_init_eff(c) do { (c) = __cap_init_eff_set; } while (0) 382 383 #define cap_raise(c, flag) ((c).cap[CAP_TO_INDEX(flag)] |= CAP_TO_MASK(flag)) 384 #define cap_lower(c, flag) ((c).cap[CAP_TO_INDEX(flag)] &= ~CAP_TO_MASK(flag)) 385 #define cap_raised(c, flag) ((c).cap[CAP_TO_INDEX(flag)] & CAP_TO_MASK(flag)) 386 387 #define CAP_BOP_ALL(c, a, b, OP) \ 388 do { \ 389 unsigned __capi; \ 390 CAP_FOR_EACH_U32(__capi) { \ 391 c.cap[__capi] = a.cap[__capi] OP b.cap[__capi]; \ 392 } \ 393 } while (0) 394 395 #define CAP_UOP_ALL(c, a, OP) \ 396 do { \ 397 unsigned __capi; \ 398 CAP_FOR_EACH_U32(__capi) { \ 399 c.cap[__capi] = OP a.cap[__capi]; \ 400 } \ 401 } while (0) 402 403 static inline kernel_cap_t cap_combine(const kernel_cap_t a, 404 const kernel_cap_t b) 405 { 406 kernel_cap_t dest; 407 CAP_BOP_ALL(dest, a, b, |); 408 return dest; 409 } 410 411 static inline kernel_cap_t cap_intersect(const kernel_cap_t a, 412 const kernel_cap_t b) 413 { 414 kernel_cap_t dest; 415 CAP_BOP_ALL(dest, a, b, &); 416 return dest; 417 } 418 419 static inline kernel_cap_t cap_drop(const kernel_cap_t a, 420 const kernel_cap_t drop) 421 { 422 kernel_cap_t dest; 423 CAP_BOP_ALL(dest, a, drop, &~); 424 return dest; 425 } 426 427 static inline kernel_cap_t cap_invert(const kernel_cap_t c) 428 { 429 kernel_cap_t dest; 430 CAP_UOP_ALL(dest, c, ~); 431 return dest; 432 } 433 434 static inline int cap_isclear(const kernel_cap_t a) 435 { 436 unsigned __capi; 437 CAP_FOR_EACH_U32(__capi) { 438 if (a.cap[__capi] != 0) 439 return 0; 440 } 441 return 1; 442 } 443 444 static inline int cap_issubset(const kernel_cap_t a, const kernel_cap_t set) 445 { 446 kernel_cap_t dest; 447 dest = cap_drop(a, set); 448 return cap_isclear(dest); 449 } 450 451 /* Used to decide between falling back on the old suser() or fsuser(). */ 452 453 static inline int cap_is_fs_cap(int cap) 454 { 455 const kernel_cap_t __cap_fs_set = CAP_FS_SET; 456 return !!(CAP_TO_MASK(cap) & __cap_fs_set.cap[CAP_TO_INDEX(cap)]); 457 } 458 459 static inline kernel_cap_t cap_drop_fs_set(const kernel_cap_t a) 460 { 461 const kernel_cap_t __cap_fs_set = CAP_FS_SET; 462 return cap_drop(a, __cap_fs_set); 463 } 464 465 static inline kernel_cap_t cap_raise_fs_set(const kernel_cap_t a, 466 const kernel_cap_t permitted) 467 { 468 const kernel_cap_t __cap_fs_set = CAP_FS_SET; 469 return cap_combine(a, 470 cap_intersect(permitted, __cap_fs_set)); 471 } 472 473 static inline kernel_cap_t cap_drop_nfsd_set(const kernel_cap_t a) 474 { 475 const kernel_cap_t __cap_fs_set = CAP_NFSD_SET; 476 return cap_drop(a, __cap_fs_set); 477 } 478 479 static inline kernel_cap_t cap_raise_nfsd_set(const kernel_cap_t a, 480 const kernel_cap_t permitted) 481 { 482 const kernel_cap_t __cap_nfsd_set = CAP_NFSD_SET; 483 return cap_combine(a, 484 cap_intersect(permitted, __cap_nfsd_set)); 485 } 486 487 extern const kernel_cap_t __cap_empty_set; 488 extern const kernel_cap_t __cap_full_set; 489 extern const kernel_cap_t __cap_init_eff_set; 490 491 int capable(int cap); 492 int __capable(struct task_struct *t, int cap); 493 494 #endif /* __KERNEL__ */ 495 496 #endif /* !_LINUX_CAPABILITY_H */ 497