1 /* 2 * This is <linux/capability.h> 3 * 4 * Andrew G. Morgan <morgan (at) kernel.org> 5 * Alexander Kjeldaas <astor (at) 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://www.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 /* deprecated - use v3 */ 35 #define _LINUX_CAPABILITY_U32S_2 2 36 37 #define _LINUX_CAPABILITY_VERSION_3 0x20080522 38 #define _LINUX_CAPABILITY_U32S_3 2 39 40 typedef struct __user_cap_header_struct { 41 __u32 version; 42 int pid; 43 } *cap_user_header_t; 44 45 typedef struct __user_cap_data_struct { 46 __u32 effective; 47 __u32 permitted; 48 __u32 inheritable; 49 } *cap_user_data_t; 50 51 52 #define VFS_CAP_REVISION_MASK 0xFF000000 53 #define VFS_CAP_REVISION_SHIFT 24 54 #define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK 55 #define VFS_CAP_FLAGS_EFFECTIVE 0x000001 56 57 #define VFS_CAP_REVISION_1 0x01000000 58 #define VFS_CAP_U32_1 1 59 #define XATTR_CAPS_SZ_1 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1)) 60 61 #define VFS_CAP_REVISION_2 0x02000000 62 #define VFS_CAP_U32_2 2 63 #define XATTR_CAPS_SZ_2 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2)) 64 65 #define XATTR_CAPS_SZ XATTR_CAPS_SZ_2 66 #define VFS_CAP_U32 VFS_CAP_U32_2 67 #define VFS_CAP_REVISION VFS_CAP_REVISION_2 68 69 struct vfs_cap_data { 70 __le32 magic_etc; /* Little endian */ 71 struct { 72 __le32 permitted; /* Little endian */ 73 __le32 inheritable; /* Little endian */ 74 } data[VFS_CAP_U32]; 75 }; 76 77 78 /* 79 * Backwardly compatible definition for source code - trapped in a 80 * 32-bit world. If you find you need this, please consider using 81 * libcap to untrap yourself... 82 */ 83 #define _LINUX_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_1 84 #define _LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_1 85 86 87 88 /** 89 ** POSIX-draft defined capabilities. 90 **/ 91 92 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this 93 overrides the restriction of changing file ownership and group 94 ownership. */ 95 96 #define CAP_CHOWN 0 97 98 /* Override all DAC access, including ACL execute access if 99 [_POSIX_ACL] is defined. Excluding DAC access covered by 100 CAP_LINUX_IMMUTABLE. */ 101 102 #define CAP_DAC_OVERRIDE 1 103 104 /* Overrides all DAC restrictions regarding read and search on files 105 and directories, including ACL restrictions if [_POSIX_ACL] is 106 defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */ 107 108 #define CAP_DAC_READ_SEARCH 2 109 110 /* Overrides all restrictions about allowed operations on files, where 111 file owner ID must be equal to the user ID, except where CAP_FSETID 112 is applicable. It doesn't override MAC and DAC restrictions. */ 113 114 #define CAP_FOWNER 3 115 116 /* Overrides the following restrictions that the effective user ID 117 shall match the file owner ID when setting the S_ISUID and S_ISGID 118 bits on that file; that the effective group ID (or one of the 119 supplementary group IDs) shall match the file owner ID when setting 120 the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are 121 cleared on successful return from chown(2) (not implemented). */ 122 123 #define CAP_FSETID 4 124 125 /* Overrides the restriction that the real or effective user ID of a 126 process sending a signal must match the real or effective user ID 127 of the process receiving the signal. */ 128 129 #define CAP_KILL 5 130 131 /* Allows setgid(2) manipulation */ 132 /* Allows setgroups(2) */ 133 /* Allows forged gids on socket credentials passing. */ 134 135 #define CAP_SETGID 6 136 137 /* Allows set*uid(2) manipulation (including fsuid). */ 138 /* Allows forged pids on socket credentials passing. */ 139 140 #define CAP_SETUID 7 141 142 143 /** 144 ** Linux-specific capabilities 145 **/ 146 147 /* Without VFS support for capabilities: 148 * Transfer any capability in your permitted set to any pid, 149 * remove any capability in your permitted set from any pid 150 * With VFS support for capabilities (neither of above, but) 151 * Add any capability from current's capability bounding set 152 * to the current process' inheritable set 153 * Allow taking bits out of capability bounding set 154 * Allow modification of the securebits for a process 155 */ 156 157 #define CAP_SETPCAP 8 158 159 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */ 160 161 #define CAP_LINUX_IMMUTABLE 9 162 163 /* Allows binding to TCP/UDP sockets below 1024 */ 164 /* Allows binding to ATM VCIs below 32 */ 165 166 #define CAP_NET_BIND_SERVICE 10 167 168 /* Allow broadcasting, listen to multicast */ 169 170 #define CAP_NET_BROADCAST 11 171 172 /* Allow interface configuration */ 173 /* Allow administration of IP firewall, masquerading and accounting */ 174 /* Allow setting debug option on sockets */ 175 /* Allow modification of routing tables */ 176 /* Allow setting arbitrary process / process group ownership on 177 sockets */ 178 /* Allow binding to any address for transparent proxying (also via NET_RAW) */ 179 /* Allow setting TOS (type of service) */ 180 /* Allow setting promiscuous mode */ 181 /* Allow clearing driver statistics */ 182 /* Allow multicasting */ 183 /* Allow read/write of device-specific registers */ 184 /* Allow activation of ATM control sockets */ 185 186 #define CAP_NET_ADMIN 12 187 188 /* Allow use of RAW sockets */ 189 /* Allow use of PACKET sockets */ 190 /* Allow binding to any address for transparent proxying (also via NET_ADMIN) */ 191 192 #define CAP_NET_RAW 13 193 194 /* Allow locking of shared memory segments */ 195 /* Allow mlock and mlockall (which doesn't really have anything to do 196 with IPC) */ 197 198 #define CAP_IPC_LOCK 14 199 200 /* Override IPC ownership checks */ 201 202 #define CAP_IPC_OWNER 15 203 204 /* Insert and remove kernel modules - modify kernel without limit */ 205 #define CAP_SYS_MODULE 16 206 207 /* Allow ioperm/iopl access */ 208 /* Allow sending USB messages to any device via /proc/bus/usb */ 209 210 #define CAP_SYS_RAWIO 17 211 212 /* Allow use of chroot() */ 213 214 #define CAP_SYS_CHROOT 18 215 216 /* Allow ptrace() of any process */ 217 218 #define CAP_SYS_PTRACE 19 219 220 /* Allow configuration of process accounting */ 221 222 #define CAP_SYS_PACCT 20 223 224 /* Allow configuration of the secure attention key */ 225 /* Allow administration of the random device */ 226 /* Allow examination and configuration of disk quotas */ 227 /* Allow setting the domainname */ 228 /* Allow setting the hostname */ 229 /* Allow calling bdflush() */ 230 /* Allow mount() and umount(), setting up new smb connection */ 231 /* Allow some autofs root ioctls */ 232 /* Allow nfsservctl */ 233 /* Allow VM86_REQUEST_IRQ */ 234 /* Allow to read/write pci config on alpha */ 235 /* Allow irix_prctl on mips (setstacksize) */ 236 /* Allow flushing all cache on m68k (sys_cacheflush) */ 237 /* Allow removing semaphores */ 238 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores 239 and shared memory */ 240 /* Allow locking/unlocking of shared memory segment */ 241 /* Allow turning swap on/off */ 242 /* Allow forged pids on socket credentials passing */ 243 /* Allow setting readahead and flushing buffers on block devices */ 244 /* Allow setting geometry in floppy driver */ 245 /* Allow turning DMA on/off in xd driver */ 246 /* Allow administration of md devices (mostly the above, but some 247 extra ioctls) */ 248 /* Allow tuning the ide driver */ 249 /* Allow access to the nvram device */ 250 /* Allow administration of apm_bios, serial and bttv (TV) device */ 251 /* Allow manufacturer commands in isdn CAPI support driver */ 252 /* Allow reading non-standardized portions of pci configuration space */ 253 /* Allow DDI debug ioctl on sbpcd driver */ 254 /* Allow setting up serial ports */ 255 /* Allow sending raw qic-117 commands */ 256 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending 257 arbitrary SCSI commands */ 258 /* Allow setting encryption key on loopback filesystem */ 259 /* Allow setting zone reclaim policy */ 260 261 #define CAP_SYS_ADMIN 21 262 263 /* Allow use of reboot() */ 264 265 #define CAP_SYS_BOOT 22 266 267 /* Allow raising priority and setting priority on other (different 268 UID) processes */ 269 /* Allow use of FIFO and round-robin (realtime) scheduling on own 270 processes and setting the scheduling algorithm used by another 271 process. */ 272 /* Allow setting cpu affinity on other processes */ 273 274 #define CAP_SYS_NICE 23 275 276 /* Override resource limits. Set resource limits. */ 277 /* Override quota limits. */ 278 /* Override reserved space on ext2 filesystem */ 279 /* Modify data journaling mode on ext3 filesystem (uses journaling 280 resources) */ 281 /* NOTE: ext2 honors fsuid when checking for resource overrides, so 282 you can override using fsuid too */ 283 /* Override size restrictions on IPC message queues */ 284 /* Allow more than 64hz interrupts from the real-time clock */ 285 /* Override max number of consoles on console allocation */ 286 /* Override max number of keymaps */ 287 288 #define CAP_SYS_RESOURCE 24 289 290 /* Allow manipulation of system clock */ 291 /* Allow irix_stime on mips */ 292 /* Allow setting the real-time clock */ 293 294 #define CAP_SYS_TIME 25 295 296 /* Allow configuration of tty devices */ 297 /* Allow vhangup() of tty */ 298 299 #define CAP_SYS_TTY_CONFIG 26 300 301 /* Allow the privileged aspects of mknod() */ 302 303 #define CAP_MKNOD 27 304 305 /* Allow taking of leases on files */ 306 307 #define CAP_LEASE 28 308 309 #define CAP_AUDIT_WRITE 29 310 311 #define CAP_AUDIT_CONTROL 30 312 313 #define CAP_SETFCAP 31 314 315 /* Override MAC access. 316 The base kernel enforces no MAC policy. 317 An LSM may enforce a MAC policy, and if it does and it chooses 318 to implement capability based overrides of that policy, this is 319 the capability it should use to do so. */ 320 321 #define CAP_MAC_OVERRIDE 32 322 323 /* Allow MAC configuration or state changes. 324 The base kernel requires no MAC configuration. 325 An LSM may enforce a MAC policy, and if it does and it chooses 326 to implement capability based checks on modifications to that 327 policy or the data required to maintain it, this is the 328 capability it should use to do so. */ 329 330 #define CAP_MAC_ADMIN 33 331 332 /* Allow configuring the kernel's syslog (printk behaviour) */ 333 334 #define CAP_SYSLOG 34 335 336 /* Allow triggering something that will wake the system */ 337 338 #define CAP_WAKE_ALARM 35 339 340 341 #define CAP_LAST_CAP CAP_WAKE_ALARM 342 343 #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP) 344 345 /* 346 * Bit location of each capability (used by user-space library and kernel) 347 */ 348 349 #define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */ 350 #define CAP_TO_MASK(x) (1 << ((x) & 31)) /* mask for indexed __u32 */ 351 352 353 #endif /* !_LINUX_CAPABILITY_H */ 354
