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