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