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