include/uapi/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://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
  11  */
  12
  13 #ifndef _UAPI_LINUX_CAPABILITY_H
  14 #define _UAPI_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 } __user *cap_user_header_t;
  44
  45 typedef struct __user_cap_data_struct {
  46         __u32 effective;
  47         __u32 permitted;
  48         __u32 inheritable;
  49 } __user *cap_user_data_t;
  50
  51
  52 #define VFS_CAP_REVISION_MASK   0xFF000000
  53 #define VFS_CAP_REVISION_SHIFT  24
  54 #define VFS_CAP_FLAGS_MASK      ~VFS_CAP_REVISION_MASK
  55 #define VFS_CAP_FLAGS_EFFECTIVE 0x000001
  56
  57 #define VFS_CAP_REVISION_1      0x01000000
  58 #define VFS_CAP_U32_1           1
  59 #define XATTR_CAPS_SZ_1         (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1))
  60
  61 #define VFS_CAP_REVISION_2      0x02000000
  62 #define VFS_CAP_U32_2           2
  63 #define XATTR_CAPS_SZ_2         (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2))
  64
  65 #define XATTR_CAPS_SZ           XATTR_CAPS_SZ_2
  66 #define VFS_CAP_U32             VFS_CAP_U32_2
  67 #define VFS_CAP_REVISION        VFS_CAP_REVISION_2
  68
  69 struct vfs_cap_data {
  70         __le32 magic_etc;            /* Little endian */
  71         struct {
  72                 __le32 permitted;    /* Little endian */
  73                 __le32 inheritable;  /* Little endian */
  74         } data[VFS_CAP_U32];
  75 };
  76
  77 #ifndef __KERNEL__
  78
  79 /*
  80  * Backwardly compatible definition for source code - trapped in a
  81  * 32-bit world. If you find you need this, please consider using
  82  * libcap to untrap yourself...
  83  */
  84 #define _LINUX_CAPABILITY_VERSION  _LINUX_CAPABILITY_VERSION_1
  85 #define _LINUX_CAPABILITY_U32S     _LINUX_CAPABILITY_U32S_1
  86
  87 #endif
  88
  89
  90 /**
  91  ** POSIX-draft defined capabilities.
  92  **/
  93
  94 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
  95    overrides the restriction of changing file ownership and group
  96    ownership. */
  97
  98 #define CAP_CHOWN            0
  99
 100 /* Override all DAC access, including ACL execute access if
 101    [_POSIX_ACL] is defined. Excluding DAC access covered by
 102    CAP_LINUX_IMMUTABLE. */
 103
 104 #define CAP_DAC_OVERRIDE     1
 105
 106 /* Overrides all DAC restrictions regarding read and search on files
 107    and directories, including ACL restrictions if [_POSIX_ACL] is
 108    defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
 109
 110 #define CAP_DAC_READ_SEARCH  2
 111
 112 /* Overrides all restrictions about allowed operations on files, where
 113    file owner ID must be equal to the user ID, except where CAP_FSETID
 114    is applicable. It doesn't override MAC and DAC restrictions. */
 115
 116 #define CAP_FOWNER           3
 117
 118 /* Overrides the following restrictions that the effective user ID
 119    shall match the file owner ID when setting the S_ISUID and S_ISGID
 120    bits on that file; that the effective group ID (or one of the
 121    supplementary group IDs) shall match the file owner ID when setting
 122    the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
 123    cleared on successful return from chown(2) (not implemented). */
 124
 125 #define CAP_FSETID           4
 126
 127 /* Overrides the restriction that the real or effective user ID of a
 128    process sending a signal must match the real or effective user ID
 129    of the process receiving the signal. */
 130
 131 #define CAP_KILL             5
 132
 133 /* Allows setgid(2) manipulation */
 134 /* Allows setgroups(2) */
 135 /* Allows forged gids on socket credentials passing. */
 136
 137 #define CAP_SETGID           6
 138
 139 /* Allows set*uid(2) manipulation (including fsuid). */
 140 /* Allows forged pids on socket credentials passing. */
 141
 142 #define CAP_SETUID           7
 143
 144
 145 /**
 146  ** Linux-specific capabilities
 147  **/
 148
 149 /* Without VFS support for capabilities:
 150  *   Transfer any capability in your permitted set to any pid,
 151  *   remove any capability in your permitted set from any pid
 152  * With VFS support for capabilities (neither of above, but)
 153  *   Add any capability from current's capability bounding set
 154  *       to the current process' inheritable set
 155  *   Allow taking bits out of capability bounding set
 156  *   Allow modification of the securebits for a process
 157  */
 158
 159 #define CAP_SETPCAP          8
 160
 161 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
 162
 163 #define CAP_LINUX_IMMUTABLE  9
 164
 165 /* Allows binding to TCP/UDP sockets below 1024 */
 166 /* Allows binding to ATM VCIs below 32 */
 167
 168 #define CAP_NET_BIND_SERVICE 10
 169
 170 /* Allow broadcasting, listen to multicast */
 171
 172 #define CAP_NET_BROADCAST    11
 173
 174 /* Allow interface configuration */
 175 /* Allow administration of IP firewall, masquerading and accounting */
 176 /* Allow setting debug option on sockets */
 177 /* Allow modification of routing tables */
 178 /* Allow setting arbitrary process / process group ownership on
 179    sockets */
 180 /* Allow binding to any address for transparent proxying (also via NET_RAW) */
 181 /* Allow setting TOS (type of service) */
 182 /* Allow setting promiscuous mode */
 183 /* Allow clearing driver statistics */
 184 /* Allow multicasting */
 185 /* Allow read/write of device-specific registers */
 186 /* Allow activation of ATM control sockets */
 187
 188 #define CAP_NET_ADMIN        12
 189
 190 /* Allow use of RAW sockets */
 191 /* Allow use of PACKET sockets */
 192 /* Allow binding to any address for transparent proxying (also via NET_ADMIN) */
 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 setting the domainname */
 230 /* Allow setting the hostname */
 231 /* Allow calling bdflush() */
 232 /* Allow mount() and umount(), setting up new smb connection */
 233 /* Allow some autofs root ioctls */
 234 /* Allow nfsservctl */
 235 /* Allow VM86_REQUEST_IRQ */
 236 /* Allow to read/write pci config on alpha */
 237 /* Allow irix_prctl on mips (setstacksize) */
 238 /* Allow flushing all cache on m68k (sys_cacheflush) */
 239 /* Allow removing semaphores */
 240 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
 241    and shared memory */
 242 /* Allow locking/unlocking of shared memory segment */
 243 /* Allow turning swap on/off */
 244 /* Allow forged pids on socket credentials passing */
 245 /* Allow setting readahead and flushing buffers on block devices */
 246 /* Allow setting geometry in floppy driver */
 247 /* Allow turning DMA on/off in xd driver */
 248 /* Allow administration of md devices (mostly the above, but some
 249    extra ioctls) */
 250 /* Allow tuning the ide driver */
 251 /* Allow access to the nvram device */
 252 /* Allow administration of apm_bios, serial and bttv (TV) device */
 253 /* Allow manufacturer commands in isdn CAPI support driver */
 254 /* Allow reading non-standardized portions of pci configuration space */
 255 /* Allow DDI debug ioctl on sbpcd driver */
 256 /* Allow setting up serial ports */
 257 /* Allow sending raw qic-117 commands */
 258 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending
 259    arbitrary SCSI commands */
 260 /* Allow setting encryption key on loopback filesystem */
 261 /* Allow setting zone reclaim policy */
 262
 263 #define CAP_SYS_ADMIN        21
 264
 265 /* Allow use of reboot() */
 266
 267 #define CAP_SYS_BOOT         22
 268
 269 /* Allow raising priority and setting priority on other (different
 270    UID) processes */
 271 /* Allow use of FIFO and round-robin (realtime) scheduling on own
 272    processes and setting the scheduling algorithm used by another
 273    process. */
 274 /* Allow setting cpu affinity on other processes */
 275
 276 #define CAP_SYS_NICE         23
 277
 278 /* Override resource limits. Set resource limits. */
 279 /* Override quota limits. */
 280 /* Override reserved space on ext2 filesystem */
 281 /* Modify data journaling mode on ext3 filesystem (uses journaling
 282    resources) */
 283 /* NOTE: ext2 honors fsuid when checking for resource overrides, so
 284    you can override using fsuid too */
 285 /* Override size restrictions on IPC message queues */
 286 /* Allow more than 64hz interrupts from the real-time clock */
 287 /* Override max number of consoles on console allocation */
 288 /* Override max number of keymaps */
 289
 290 #define CAP_SYS_RESOURCE     24
 291
 292 /* Allow manipulation of system clock */
 293 /* Allow irix_stime on mips */
 294 /* Allow setting the real-time clock */
 295
 296 #define CAP_SYS_TIME         25
 297
 298 /* Allow configuration of tty devices */
 299 /* Allow vhangup() of tty */
 300
 301 #define CAP_SYS_TTY_CONFIG   26
 302
 303 /* Allow the privileged aspects of mknod() */
 304
 305 #define CAP_MKNOD            27
 306
 307 /* Allow taking of leases on files */
 308
 309 #define CAP_LEASE            28
 310
 311 #define CAP_AUDIT_WRITE      29
 312
 313 #define CAP_AUDIT_CONTROL    30
 314
 315 #define CAP_SETFCAP          31
 316
 317 /* Override MAC access.
 318    The base kernel enforces no MAC policy.
 319    An LSM may enforce a MAC policy, and if it does and it chooses
 320    to implement capability based overrides of that policy, this is
 321    the capability it should use to do so. */
 322
 323 #define CAP_MAC_OVERRIDE     32
 324
 325 /* Allow MAC configuration or state changes.
 326    The base kernel requires no MAC configuration.
 327    An LSM may enforce a MAC policy, and if it does and it chooses
 328    to implement capability based checks on modifications to that
 329    policy or the data required to maintain it, this is the
 330    capability it should use to do so. */
 331
 332 #define CAP_MAC_ADMIN        33
 333
 334 /* Allow configuring the kernel's syslog (printk behaviour) */
 335
 336 #define CAP_SYSLOG           34
 337
 338 /* Allow triggering something that will wake the system */
 339
 340 #define CAP_WAKE_ALARM            35
 341
 342 /* Allow preventing system suspends */
 343
 344 #define CAP_BLOCK_SUSPEND    36
 345
 346 #define CAP_LAST_CAP         CAP_BLOCK_SUSPEND
 347
 348 #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)
 349
 350 /*
 351  * Bit location of each capability (used by user-space library and kernel)
 352  */
 353
 354 #define CAP_TO_INDEX(x)     ((x) >> 5)        /* 1 << 5 == bits in __u32 */
 355 #define CAP_TO_MASK(x)      (1 << ((x) & 31)) /* mask for indexed __u32 */
 356
 357
 358 #endif /* _UAPI_LINUX_CAPABILITY_H */