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-2.2/ 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 32 typedef struct __user_cap_header_struct { 33 __u32 version; 34 int pid; 35 } __user *cap_user_header_t; 36 37 typedef 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 51 typedef struct kernel_cap_struct { 52 __u32 cap; 53 } kernel_cap_t; 54 55 #else 56 57 typedef __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 */ 294 extern 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)) 321 322 static 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 } 328 329 static 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 } 335 336 static 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 } 342 343 static 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 */ 362