include/linux/capability.h

   1 /*
   2  * This is <linux/capability.h>
   3  *
   4  * Andrew G. Morgan <morgan@transmeta.com>
   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-2.2/
  11  */
  12
  13 #ifndef _LINUX_CAPABILITY_H
  14 #define _LINUX_CAPABILITY_H
  15
  16 #include <linux/types.h>
  17 #include <linux/fs.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 } *cap_user_header_t;
  36
  37 typedef struct __user_cap_data_struct {
  38         __u32 effective;
  39         __u32 permitted;
  40         __u32 inheritable;
  41 } *cap_user_data_t;
  42
  43 #ifdef __KERNEL__
  44
  45 /* #define STRICT_CAP_T_TYPECHECKS */
  46
  47 #ifdef STRICT_CAP_T_TYPECHECKS
  48
  49 typedef struct kernel_cap_struct {
  50         __u32 cap;
  51 } kernel_cap_t;
  52
  53 #else
  54
  55 typedef __u32 kernel_cap_t;
  56
  57 #endif
  58
  59 #define _USER_CAP_HEADER_SIZE  (2*sizeof(__u32))
  60 #define _KERNEL_CAP_T_SIZE     (sizeof(kernel_cap_t))
  61
  62 #endif
  63
  64
  65 /**
  66  ** POSIX-draft defined capabilities.
  67  **/
  68
  69 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
  70    overrides the restriction of changing file ownership and group
  71    ownership. */
  72
  73 #define CAP_CHOWN            0
  74
  75 /* Override all DAC access, including ACL execute access if
  76    [_POSIX_ACL] is defined. Excluding DAC access covered by
  77    CAP_LINUX_IMMUTABLE. */
  78
  79 #define CAP_DAC_OVERRIDE     1
  80
  81 /* Overrides all DAC restrictions regarding read and search on files
  82    and directories, including ACL restrictions if [_POSIX_ACL] is
  83    defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
  84
  85 #define CAP_DAC_READ_SEARCH  2
  86
  87 /* Overrides all restrictions about allowed operations on files, where
  88    file owner ID must be equal to the user ID, except where CAP_FSETID
  89    is applicable. It doesn't override MAC and DAC restrictions. */
  90
  91 #define CAP_FOWNER           3
  92
  93 /* Overrides the following restrictions that the effective user ID
  94    shall match the file owner ID when setting the S_ISUID and S_ISGID
  95    bits on that file; that the effective group ID (or one of the
  96    supplementary group IDs) shall match the file owner ID when setting
  97    the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
  98    cleared on successful return from chown(2) (not implemented). */
  99
 100 #define CAP_FSETID           4
 101
 102 /* Used to decide between falling back on the old suser() or fsuser(). */
 103
 104 #define CAP_FS_MASK          0x1f
 105
 106 /* Overrides the restriction that the real or effective user ID of a
 107    process sending a signal must match the real or effective user ID
 108    of the process receiving the signal. */
 109
 110 #define CAP_KILL             5
 111
 112 /* Allows setgid(2) manipulation */
 113 /* Allows setgroups(2) */
 114 /* Allows forged gids on socket credentials passing. */
 115
 116 #define CAP_SETGID           6
 117
 118 /* Allows set*uid(2) manipulation (including fsuid). */
 119 /* Allows forged pids on socket credentials passing. */
 120
 121 #define CAP_SETUID           7
 122
 123
 124 /**
 125  ** Linux-specific capabilities
 126  **/
 127
 128 /* Transfer any capability in your permitted set to any pid,
 129    remove any capability in your permitted set from any pid */
 130
 131 #define CAP_SETPCAP          8
 132
 133 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
 134
 135 #define CAP_LINUX_IMMUTABLE  9
 136
 137 /* Allows binding to TCP/UDP sockets below 1024 */
 138 /* Allows binding to ATM VCIs below 32 */
 139
 140 #define CAP_NET_BIND_SERVICE 10
 141
 142 /* Allow broadcasting, listen to multicast */
 143
 144 #define CAP_NET_BROADCAST    11
 145
 146 /* Allow interface configuration */
 147 /* Allow administration of IP firewall, masquerading and accounting */
 148 /* Allow setting debug option on sockets */
 149 /* Allow modification of routing tables */
 150 /* Allow setting arbitrary process / process group ownership on
 151    sockets */
 152 /* Allow binding to any address for transparent proxying */
 153 /* Allow setting TOS (type of service) */
 154 /* Allow setting promiscuous mode */
 155 /* Allow clearing driver statistics */
 156 /* Allow multicasting */
 157 /* Allow read/write of device-specific registers */
 158 /* Allow activation of ATM control sockets */
 159
 160 #define CAP_NET_ADMIN        12
 161
 162 /* Allow use of RAW sockets */
 163 /* Allow use of PACKET sockets */
 164
 165 #define CAP_NET_RAW          13
 166
 167 /* Allow locking of shared memory segments */
 168 /* Allow mlock and mlockall (which doesn't really have anything to do
 169    with IPC) */
 170
 171 #define CAP_IPC_LOCK         14
 172
 173 /* Override IPC ownership checks */
 174
 175 #define CAP_IPC_OWNER        15
 176
 177 /* Insert and remove kernel modules - modify kernel without limit */
 178 /* Modify cap_bset */
 179 #define CAP_SYS_MODULE       16
 180
 181 /* Allow ioperm/iopl access */
 182 /* Allow sending USB messages to any device via /proc/bus/usb */
 183
 184 #define CAP_SYS_RAWIO        17
 185
 186 /* Allow use of chroot() */
 187
 188 #define CAP_SYS_CHROOT       18
 189
 190 /* Allow ptrace() of any process */
 191
 192 #define CAP_SYS_PTRACE       19
 193
 194 /* Allow configuration of process accounting */
 195
 196 #define CAP_SYS_PACCT        20
 197
 198 /* Allow configuration of the secure attention key */
 199 /* Allow administration of the random device */
 200 /* Allow examination and configuration of disk quotas */
 201 /* Allow configuring the kernel's syslog (printk behaviour) */
 202 /* Allow setting the domainname */
 203 /* Allow setting the hostname */
 204 /* Allow calling bdflush() */
 205 /* Allow mount() and umount(), setting up new smb connection */
 206 /* Allow some autofs root ioctls */
 207 /* Allow nfsservctl */
 208 /* Allow VM86_REQUEST_IRQ */
 209 /* Allow to read/write pci config on alpha */
 210 /* Allow irix_prctl on mips (setstacksize) */
 211 /* Allow flushing all cache on m68k (sys_cacheflush) */
 212 /* Allow removing semaphores */
 213 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
 214    and shared memory */
 215 /* Allow locking/unlocking of shared memory segment */
 216 /* Allow turning swap on/off */
 217 /* Allow forged pids on socket credentials passing */
 218 /* Allow setting readahead and flushing buffers on block devices */
 219 /* Allow setting geometry in floppy driver */
 220 /* Allow turning DMA on/off in xd driver */
 221 /* Allow administration of md devices (mostly the above, but some
 222    extra ioctls) */
 223 /* Allow tuning the ide driver */
 224 /* Allow access to the nvram device */
 225 /* Allow administration of apm_bios, serial and bttv (TV) device */
 226 /* Allow manufacturer commands in isdn CAPI support driver */
 227 /* Allow reading non-standardized portions of pci configuration space */
 228 /* Allow DDI debug ioctl on sbpcd driver */
 229 /* Allow setting up serial ports */
 230 /* Allow sending raw qic-117 commands */
 231 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending
 232    arbitrary SCSI commands */
 233 /* Allow setting encryption key on loopback filesystem */
 234
 235 #define CAP_SYS_ADMIN        21
 236
 237 /* Allow use of reboot() */
 238
 239 #define CAP_SYS_BOOT         22
 240
 241 /* Allow raising priority and setting priority on other (different
 242    UID) processes */
 243 /* Allow use of FIFO and round-robin (realtime) scheduling on own
 244    processes and setting the scheduling algorithm used by another
 245    process. */
 246
 247 #define CAP_SYS_NICE         23
 248
 249 /* Override resource limits. Set resource limits. */
 250 /* Override quota limits. */
 251 /* Override reserved space on ext2 filesystem */
 252 /* NOTE: ext2 honors fsuid when checking for resource overrides, so
 253    you can override using fsuid too */
 254 /* Override size restrictions on IPC message queues */
 255 /* Allow more than 64hz interrupts from the real-time clock */
 256 /* Override max number of consoles on console allocation */
 257 /* Override max number of keymaps */
 258
 259 #define CAP_SYS_RESOURCE     24
 260
 261 /* Allow manipulation of system clock */
 262 /* Allow irix_stime on mips */
 263 /* Allow setting the real-time clock */
 264
 265 #define CAP_SYS_TIME         25
 266
 267 /* Allow configuration of tty devices */
 268 /* Allow vhangup() of tty */
 269
 270 #define CAP_SYS_TTY_CONFIG   26
 271
 272 /* Allow the privileged aspects of mknod() */
 273
 274 #define CAP_MKNOD            27
 275
 276 /* Allow taking of leases on files */
 277
 278 #define CAP_LEASE            28
 279
 280 #ifdef __KERNEL__
 281 /*
 282  * Bounding set
 283  */
 284 extern kernel_cap_t cap_bset;
 285
 286 /*
 287  * Internal kernel functions only
 288  */
 289
 290 #ifdef STRICT_CAP_T_TYPECHECKS
 291
 292 #define to_cap_t(x) { x }
 293 #define cap_t(x) (x).cap
 294
 295 #else
 296
 297 #define to_cap_t(x) (x)
 298 #define cap_t(x) (x)
 299
 300 #endif
 301
 302 #define CAP_EMPTY_SET       to_cap_t(0)
 303 #define CAP_FULL_SET        to_cap_t(~0)
 304 #define CAP_INIT_EFF_SET    to_cap_t(~0 & ~CAP_TO_MASK(CAP_SETPCAP))
 305 #define CAP_INIT_INH_SET    to_cap_t(0)
 306
 307 #define CAP_TO_MASK(x) (1 << (x))
 308 #define cap_raise(c, flag)   (cap_t(c) |=  CAP_TO_MASK(flag))
 309 #define cap_lower(c, flag)   (cap_t(c) &= ~CAP_TO_MASK(flag))
 310 #define cap_raised(c, flag)  (cap_t(c) & CAP_TO_MASK(flag))
 311
 312 static inline kernel_cap_t cap_combine(kernel_cap_t a, kernel_cap_t b)
 313 {
 314      kernel_cap_t dest;
 315      cap_t(dest) = cap_t(a) | cap_t(b);
 316      return dest;
 317 }
 318
 319 static inline kernel_cap_t cap_intersect(kernel_cap_t a, kernel_cap_t b)
 320 {
 321      kernel_cap_t dest;
 322      cap_t(dest) = cap_t(a) & cap_t(b);
 323      return dest;
 324 }
 325
 326 static inline kernel_cap_t cap_drop(kernel_cap_t a, kernel_cap_t drop)
 327 {
 328      kernel_cap_t dest;
 329      cap_t(dest) = cap_t(a) & ~cap_t(drop);
 330      return dest;
 331 }
 332
 333 static inline kernel_cap_t cap_invert(kernel_cap_t c)
 334 {
 335      kernel_cap_t dest;
 336      cap_t(dest) = ~cap_t(c);
 337      return dest;
 338 }
 339
 340 #define cap_isclear(c)       (!cap_t(c))
 341 #define cap_issubset(a,set)  (!(cap_t(a) & ~cap_t(set)))
 342
 343 #define cap_clear(c)         do { cap_t(c) =  0; } while(0)
 344 #define cap_set_full(c)      do { cap_t(c) = ~0; } while(0)
 345 #define cap_mask(c,mask)     do { cap_t(c) &= cap_t(mask); } while(0)
 346
 347 #define cap_is_fs_cap(c)     (CAP_TO_MASK(c) & CAP_FS_MASK)
 348
 349 #endif /* __KERNEL__ */
 350
 351 #endif /* !_LINUX_CAPABILITY_H */