1 /* 2 * This is <linux/capability.h> 3 * 4 * Andrew G. Morgan <morgan@kernel.org> 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-2.6/ 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 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 81 /* 82 * Backwardly compatible definition for source code - trapped in a 83 * 32-bit world. If you find you need this, please consider using 84 * libcap to untrap yourself... 85 */ 86 #define _LINUX_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_1 87 #define _LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_1 88 89 90 91 /** 92 ** POSIX-draft defined capabilities. 93 **/ 94 95 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this 96 overrides the restriction of changing file ownership and group 97 ownership. */ 98 99 #define CAP_CHOWN 0 100 101 /* Override all DAC access, including ACL execute access if 102 [_POSIX_ACL] is defined. Excluding DAC access covered by 103 CAP_LINUX_IMMUTABLE. */ 104 105 #define CAP_DAC_OVERRIDE 1 106 107 /* Overrides all DAC restrictions regarding read and search on files 108 and directories, including ACL restrictions if [_POSIX_ACL] is 109 defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */ 110 111 #define CAP_DAC_READ_SEARCH 2 112 113 /* Overrides all restrictions about allowed operations on files, where 114 file owner ID must be equal to the user ID, except where CAP_FSETID 115 is applicable. It doesn't override MAC and DAC restrictions. */ 116 117 #define CAP_FOWNER 3 118 119 /* Overrides the following restrictions that the effective user ID 120 shall match the file owner ID when setting the S_ISUID and S_ISGID 121 bits on that file; that the effective group ID (or one of the 122 supplementary group IDs) shall match the file owner ID when setting 123 the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are 124 cleared on successful return from chown(2) (not implemented). */ 125 126 #define CAP_FSETID 4 127 128 /* Overrides the restriction that the real or effective user ID of a 129 process sending a signal must match the real or effective user ID 130 of the process receiving the signal. */ 131 132 #define CAP_KILL 5 133 134 /* Allows setgid(2) manipulation */ 135 /* Allows setgroups(2) */ 136 /* Allows forged gids on socket credentials passing. */ 137 138 #define CAP_SETGID 6 139 140 /* Allows set*uid(2) manipulation (including fsuid). */ 141 /* Allows forged pids on socket credentials passing. */ 142 143 #define CAP_SETUID 7 144 145 146 /** 147 ** Linux-specific capabilities 148 **/ 149 150 /* Without VFS support for capabilities: 151 * Transfer any capability in your permitted set to any pid, 152 * remove any capability in your permitted set from any pid 153 * With VFS support for capabilities (neither of above, but) 154 * Add any capability from current's capability bounding set 155 * to the current process' inheritable set 156 * Allow taking bits out of capability bounding set 157 * Allow modification of the securebits for a process 158 */ 159 160 #define CAP_SETPCAP 8 161 162 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */ 163 164 #define CAP_LINUX_IMMUTABLE 9 165 166 /* Allows binding to TCP/UDP sockets below 1024 */ 167 /* Allows binding to ATM VCIs below 32 */ 168 169 #define CAP_NET_BIND_SERVICE 10 170 171 /* Allow broadcasting, listen to multicast */ 172 173 #define CAP_NET_BROADCAST 11 174 175 /* Allow interface configuration */ 176 /* Allow administration of IP firewall, masquerading and accounting */ 177 /* Allow setting debug option on sockets */ 178 /* Allow modification of routing tables */ 179 /* Allow setting arbitrary process / process group ownership on 180 sockets */ 181 /* Allow binding to any address for transparent proxying */ 182 /* Allow setting TOS (type of service) */ 183 /* Allow setting promiscuous mode */ 184 /* Allow clearing driver statistics */ 185 /* Allow multicasting */ 186 /* Allow read/write of device-specific registers */ 187 /* Allow activation of ATM control sockets */ 188 189 #define CAP_NET_ADMIN 12 190 191 /* Allow use of RAW sockets */ 192 /* Allow use of PACKET sockets */ 193 194 #define CAP_NET_RAW 13 195 196 /* Allow locking of shared memory segments */ 197 /* Allow mlock and mlockall (which doesn't really have anything to do 198 with IPC) */ 199 200 #define CAP_IPC_LOCK 14 201 202 /* Override IPC ownership checks */ 203 204 #define CAP_IPC_OWNER 15 205 206 /* Insert and remove kernel modules - modify kernel without limit */ 207 #define CAP_SYS_MODULE 16 208 209 /* Allow ioperm/iopl access */ 210 /* Allow sending USB messages to any device via /proc/bus/usb */ 211 212 #define CAP_SYS_RAWIO 17 213 214 /* Allow use of chroot() */ 215 216 #define CAP_SYS_CHROOT 18 217 218 /* Allow ptrace() of any process */ 219 220 #define CAP_SYS_PTRACE 19 221 222 /* Allow configuration of process accounting */ 223 224 #define CAP_SYS_PACCT 20 225 226 /* Allow configuration of the secure attention key */ 227 /* Allow administration of the random device */ 228 /* Allow examination and configuration of disk quotas */ 229 /* Allow configuring the kernel's syslog (printk behaviour) */ 230 /* Allow setting the domainname */ 231 /* Allow setting the hostname */ 232 /* Allow calling bdflush() */ 233 /* Allow mount() and umount(), setting up new smb connection */ 234 /* Allow some autofs root ioctls */ 235 /* Allow nfsservctl */ 236 /* Allow VM86_REQUEST_IRQ */ 237 /* Allow to read/write pci config on alpha */ 238 /* Allow irix_prctl on mips (setstacksize) */ 239 /* Allow flushing all cache on m68k (sys_cacheflush) */ 240 /* Allow removing semaphores */ 241 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores 242 and shared memory */ 243 /* Allow locking/unlocking of shared memory segment */ 244 /* Allow turning swap on/off */ 245 /* Allow forged pids on socket credentials passing */ 246 /* Allow setting readahead and flushing buffers on block devices */ 247 /* Allow setting geometry in floppy driver */ 248 /* Allow turning DMA on/off in xd driver */ 249 /* Allow administration of md devices (mostly the above, but some 250 extra ioctls) */ 251 /* Allow tuning the ide driver */ 252 /* Allow access to the nvram device */ 253 /* Allow administration of apm_bios, serial and bttv (TV) device */ 254 /* Allow manufacturer commands in isdn CAPI support driver */ 255 /* Allow reading non-standardized portions of pci configuration space */ 256 /* Allow DDI debug ioctl on sbpcd driver */ 257 /* Allow setting up serial ports */ 258 /* Allow sending raw qic-117 commands */ 259 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending 260 arbitrary SCSI commands */ 261 /* Allow setting encryption key on loopback filesystem */ 262 /* Allow setting zone reclaim policy */ 263 264 #define CAP_SYS_ADMIN 21 265 266 /* Allow use of reboot() */ 267 268 #define CAP_SYS_BOOT 22 269 270 /* Allow raising priority and setting priority on other (different 271 UID) processes */ 272 /* Allow use of FIFO and round-robin (realtime) scheduling on own 273 processes and setting the scheduling algorithm used by another 274 process. */ 275 /* Allow setting cpu affinity on other processes */ 276 277 #define CAP_SYS_NICE 23 278 279 /* Override resource limits. Set resource limits. */ 280 /* Override quota limits. */ 281 /* Override reserved space on ext2 filesystem */ 282 /* Modify data journaling mode on ext3 filesystem (uses journaling 283 resources) */ 284 /* NOTE: ext2 honors fsuid when checking for resource overrides, so 285 you can override using fsuid too */ 286 /* Override size restrictions on IPC message queues */ 287 /* Allow more than 64hz interrupts from the real-time clock */ 288 /* Override max number of consoles on console allocation */ 289 /* Override max number of keymaps */ 290 291 #define CAP_SYS_RESOURCE 24 292 293 /* Allow manipulation of system clock */ 294 /* Allow irix_stime on mips */ 295 /* Allow setting the real-time clock */ 296 297 #define CAP_SYS_TIME 25 298 299 /* Allow configuration of tty devices */ 300 /* Allow vhangup() of tty */ 301 302 #define CAP_SYS_TTY_CONFIG 26 303 304 /* Allow the privileged aspects of mknod() */ 305 306 #define CAP_MKNOD 27 307 308 /* Allow taking of leases on files */ 309 310 #define CAP_LEASE 28 311 312 #define CAP_AUDIT_WRITE 29 313 314 #define CAP_AUDIT_CONTROL 30 315 316 #define CAP_SETFCAP 31 317 318 /* Override MAC access. 319 The base kernel enforces no MAC policy. 320 An LSM may enforce a MAC policy, and if it does and it chooses 321 to implement capability based overrides of that policy, this is 322 the capability it should use to do so. */ 323 324 #define CAP_MAC_OVERRIDE 32 325 326 /* Allow MAC configuration or state changes. 327 The base kernel requires no MAC configuration. 328 An LSM may enforce a MAC policy, and if it does and it chooses 329 to implement capability based checks on modifications to that 330 policy or the data required to maintain it, this is the 331 capability it should use to do so. */ 332 333 #define CAP_MAC_ADMIN 33 334 335 #define CAP_LAST_CAP CAP_MAC_ADMIN 336 337 #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP) 338 339 /* 340 * Bit location of each capability (used by user-space library and kernel) 341 */ 342 343 #define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */ 344 #define CAP_TO_MASK(x) (1 << ((x) & 31)) /* mask for indexed __u32 */ 345 346 347 #endif /* !_LINUX_CAPABILITY_H */ 348