include/linux/capability.h

   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 #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 #define XATTR_CAPS_SUFFIX "capability"
  46 #define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
  47
  48 #define XATTR_CAPS_SZ (3*sizeof(__le32))
  49 #define VFS_CAP_REVISION_MASK   0xFF000000
  50 #define VFS_CAP_REVISION_1      0x01000000
  51
  52 #define VFS_CAP_REVISION        VFS_CAP_REVISION_1
  53
  54 #define VFS_CAP_FLAGS_MASK      ~VFS_CAP_REVISION_MASK
  55 #define VFS_CAP_FLAGS_EFFECTIVE 0x000001
  56
  57 struct vfs_cap_data {
  58         __u32 magic_etc;  /* Little endian */
  59         struct {
  60                 __u32 permitted;    /* Little endian */
  61                 __u32 inheritable;  /* Little endian */
  62         } data[1];
  63 };
  64
  65 #ifdef __KERNEL__
  66
  67 /* #define STRICT_CAP_T_TYPECHECKS */
  68
  69 #ifdef STRICT_CAP_T_TYPECHECKS
  70
  71 typedef struct kernel_cap_struct {
  72         __u32 cap;
  73 } kernel_cap_t;
  74
  75 #else
  76
  77 typedef __u32 kernel_cap_t;
  78
  79 #endif
  80
  81 #define _USER_CAP_HEADER_SIZE  (2*sizeof(__u32))
  82 #define _KERNEL_CAP_T_SIZE     (sizeof(kernel_cap_t))
  83
  84 #endif
  85
  86
  87 /**
  88  ** POSIX-draft defined capabilities.
  89  **/
  90
  91 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
  92    overrides the restriction of changing file ownership and group
  93    ownership. */
  94
  95 #define CAP_CHOWN            0
  96
  97 /* Override all DAC access, including ACL execute access if
  98    [_POSIX_ACL] is defined. Excluding DAC access covered by
  99    CAP_LINUX_IMMUTABLE. */
 100
 101 #define CAP_DAC_OVERRIDE     1
 102
 103 /* Overrides all DAC restrictions regarding read and search on files
 104    and directories, including ACL restrictions if [_POSIX_ACL] is
 105    defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
 106
 107 #define CAP_DAC_READ_SEARCH  2
 108
 109 /* Overrides all restrictions about allowed operations on files, where
 110    file owner ID must be equal to the user ID, except where CAP_FSETID
 111    is applicable. It doesn't override MAC and DAC restrictions. */
 112
 113 #define CAP_FOWNER           3
 114
 115 /* Overrides the following restrictions that the effective user ID
 116    shall match the file owner ID when setting the S_ISUID and S_ISGID
 117    bits on that file; that the effective group ID (or one of the
 118    supplementary group IDs) shall match the file owner ID when setting
 119    the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
 120    cleared on successful return from chown(2) (not implemented). */
 121
 122 #define CAP_FSETID           4
 123
 124 /* Used to decide between falling back on the old suser() or fsuser(). */
 125
 126 #define CAP_FS_MASK          0x1f
 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 /* Transfer any capability in your permitted set to any pid,
 151    remove any capability in your permitted set from any pid */
 152
 153 #define CAP_SETPCAP          8
 154
 155 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
 156
 157 #define CAP_LINUX_IMMUTABLE  9
 158
 159 /* Allows binding to TCP/UDP sockets below 1024 */
 160 /* Allows binding to ATM VCIs below 32 */
 161
 162 #define CAP_NET_BIND_SERVICE 10
 163
 164 /* Allow broadcasting, listen to multicast */
 165
 166 #define CAP_NET_BROADCAST    11
 167
 168 /* Allow interface configuration */
 169 /* Allow administration of IP firewall, masquerading and accounting */
 170 /* Allow setting debug option on sockets */
 171 /* Allow modification of routing tables */
 172 /* Allow setting arbitrary process / process group ownership on
 173    sockets */
 174 /* Allow binding to any address for transparent proxying */
 175 /* Allow setting TOS (type of service) */
 176 /* Allow setting promiscuous mode */
 177 /* Allow clearing driver statistics */
 178 /* Allow multicasting */
 179 /* Allow read/write of device-specific registers */
 180 /* Allow activation of ATM control sockets */
 181
 182 #define CAP_NET_ADMIN        12
 183
 184 /* Allow use of RAW sockets */
 185 /* Allow use of PACKET sockets */
 186
 187 #define CAP_NET_RAW          13
 188
 189 /* Allow locking of shared memory segments */
 190 /* Allow mlock and mlockall (which doesn't really have anything to do
 191    with IPC) */
 192
 193 #define CAP_IPC_LOCK         14
 194
 195 /* Override IPC ownership checks */
 196
 197 #define CAP_IPC_OWNER        15
 198
 199 /* Insert and remove kernel modules - modify kernel without limit */
 200 /* Modify cap_bset */
 201 #define CAP_SYS_MODULE       16
 202
 203 /* Allow ioperm/iopl access */
 204 /* Allow sending USB messages to any device via /proc/bus/usb */
 205
 206 #define CAP_SYS_RAWIO        17
 207
 208 /* Allow use of chroot() */
 209
 210 #define CAP_SYS_CHROOT       18
 211
 212 /* Allow ptrace() of any process */
 213
 214 #define CAP_SYS_PTRACE       19
 215
 216 /* Allow configuration of process accounting */
 217
 218 #define CAP_SYS_PACCT        20
 219
 220 /* Allow configuration of the secure attention key */
 221 /* Allow administration of the random device */
 222 /* Allow examination and configuration of disk quotas */
 223 /* Allow configuring the kernel's syslog (printk behaviour) */
 224 /* Allow setting the domainname */
 225 /* Allow setting the hostname */
 226 /* Allow calling bdflush() */
 227 /* Allow mount() and umount(), setting up new smb connection */
 228 /* Allow some autofs root ioctls */
 229 /* Allow nfsservctl */
 230 /* Allow VM86_REQUEST_IRQ */
 231 /* Allow to read/write pci config on alpha */
 232 /* Allow irix_prctl on mips (setstacksize) */
 233 /* Allow flushing all cache on m68k (sys_cacheflush) */
 234 /* Allow removing semaphores */
 235 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
 236    and shared memory */
 237 /* Allow locking/unlocking of shared memory segment */
 238 /* Allow turning swap on/off */
 239 /* Allow forged pids on socket credentials passing */
 240 /* Allow setting readahead and flushing buffers on block devices */
 241 /* Allow setting geometry in floppy driver */
 242 /* Allow turning DMA on/off in xd driver */
 243 /* Allow administration of md devices (mostly the above, but some
 244    extra ioctls) */
 245 /* Allow tuning the ide driver */
 246 /* Allow access to the nvram device */
 247 /* Allow administration of apm_bios, serial and bttv (TV) device */
 248 /* Allow manufacturer commands in isdn CAPI support driver */
 249 /* Allow reading non-standardized portions of pci configuration space */
 250 /* Allow DDI debug ioctl on sbpcd driver */
 251 /* Allow setting up serial ports */
 252 /* Allow sending raw qic-117 commands */
 253 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending
 254    arbitrary SCSI commands */
 255 /* Allow setting encryption key on loopback filesystem */
 256 /* Allow setting zone reclaim policy */
 257
 258 #define CAP_SYS_ADMIN        21
 259
 260 /* Allow use of reboot() */
 261
 262 #define CAP_SYS_BOOT         22
 263
 264 /* Allow raising priority and setting priority on other (different
 265    UID) processes */
 266 /* Allow use of FIFO and round-robin (realtime) scheduling on own
 267    processes and setting the scheduling algorithm used by another
 268    process. */
 269 /* Allow setting cpu affinity on other processes */
 270
 271 #define CAP_SYS_NICE         23
 272
 273 /* Override resource limits. Set resource limits. */
 274 /* Override quota limits. */
 275 /* Override reserved space on ext2 filesystem */
 276 /* Modify data journaling mode on ext3 filesystem (uses journaling
 277    resources) */
 278 /* NOTE: ext2 honors fsuid when checking for resource overrides, so
 279    you can override using fsuid too */
 280 /* Override size restrictions on IPC message queues */
 281 /* Allow more than 64hz interrupts from the real-time clock */
 282 /* Override max number of consoles on console allocation */
 283 /* Override max number of keymaps */
 284
 285 #define CAP_SYS_RESOURCE     24
 286
 287 /* Allow manipulation of system clock */
 288 /* Allow irix_stime on mips */
 289 /* Allow setting the real-time clock */
 290
 291 #define CAP_SYS_TIME         25
 292
 293 /* Allow configuration of tty devices */
 294 /* Allow vhangup() of tty */
 295
 296 #define CAP_SYS_TTY_CONFIG   26
 297
 298 /* Allow the privileged aspects of mknod() */
 299
 300 #define CAP_MKNOD            27
 301
 302 /* Allow taking of leases on files */
 303
 304 #define CAP_LEASE            28
 305
 306 #define CAP_AUDIT_WRITE      29
 307
 308 #define CAP_AUDIT_CONTROL    30
 309
 310 #define CAP_SETFCAP          31
 311
 312 #ifdef __KERNEL__
 313
 314 /*
 315  * Internal kernel functions only
 316  */
 317
 318 #ifdef STRICT_CAP_T_TYPECHECKS
 319
 320 #define to_cap_t(x) { x }
 321 #define cap_t(x) (x).cap
 322
 323 #else
 324
 325 #define to_cap_t(x) (x)
 326 #define cap_t(x) (x)
 327
 328 #endif
 329
 330 #define CAP_EMPTY_SET       to_cap_t(0)
 331 #define CAP_FULL_SET        to_cap_t(~0)
 332 #define CAP_INIT_EFF_SET    to_cap_t(~0 & ~CAP_TO_MASK(CAP_SETPCAP))
 333 #define CAP_INIT_INH_SET    to_cap_t(0)
 334
 335 #define CAP_TO_MASK(x) (1 << (x))
 336 #define cap_raise(c, flag)   (cap_t(c) |=  CAP_TO_MASK(flag))
 337 #define cap_lower(c, flag)   (cap_t(c) &= ~CAP_TO_MASK(flag))
 338 #define cap_raised(c, flag)  (cap_t(c) & CAP_TO_MASK(flag))
 339
 340 static inline kernel_cap_t cap_combine(kernel_cap_t a, kernel_cap_t b)
 341 {
 342      kernel_cap_t dest;
 343      cap_t(dest) = cap_t(a) | cap_t(b);
 344      return dest;
 345 }
 346
 347 static inline kernel_cap_t cap_intersect(kernel_cap_t a, kernel_cap_t b)
 348 {
 349      kernel_cap_t dest;
 350      cap_t(dest) = cap_t(a) & cap_t(b);
 351      return dest;
 352 }
 353
 354 static inline kernel_cap_t cap_drop(kernel_cap_t a, kernel_cap_t drop)
 355 {
 356      kernel_cap_t dest;
 357      cap_t(dest) = cap_t(a) & ~cap_t(drop);
 358      return dest;
 359 }
 360
 361 static inline kernel_cap_t cap_invert(kernel_cap_t c)
 362 {
 363      kernel_cap_t dest;
 364      cap_t(dest) = ~cap_t(c);
 365      return dest;
 366 }
 367
 368 #define cap_isclear(c)       (!cap_t(c))
 369 #define cap_issubset(a,set)  (!(cap_t(a) & ~cap_t(set)))
 370
 371 #define cap_clear(c)         do { cap_t(c) =  0; } while(0)
 372 #define cap_set_full(c)      do { cap_t(c) = ~0; } while(0)
 373 #define cap_mask(c,mask)     do { cap_t(c) &= cap_t(mask); } while(0)
 374
 375 #define cap_is_fs_cap(c)     (CAP_TO_MASK(c) & CAP_FS_MASK)
 376
 377 int capable(int cap);
 378 int __capable(struct task_struct *t, int cap);
 379
 380 #endif /* __KERNEL__ */
 381
 382 #endif /* !_LINUX_CAPABILITY_H */