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 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 #ifdef __KERNEL__
  46
  47 #include <linux/spinlock.h>
  48 #include <asm/current.h>
  49
  50 /* #define STRICT_CAP_T_TYPECHECKS */
  51
  52 #ifdef STRICT_CAP_T_TYPECHECKS
  53
  54 typedef struct kernel_cap_struct {
  55         __u32 cap;
  56 } kernel_cap_t;
  57
  58 #else
  59
  60 typedef __u32 kernel_cap_t;
  61
  62 #endif
  63
  64 #define _USER_CAP_HEADER_SIZE  (2*sizeof(__u32))
  65 #define _KERNEL_CAP_T_SIZE     (sizeof(kernel_cap_t))
  66
  67 #endif
  68
  69
  70 /**
  71  ** POSIX-draft defined capabilities.
  72  **/
  73
  74 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
  75    overrides the restriction of changing file ownership and group
  76    ownership. */
  77
  78 #define CAP_CHOWN            0
  79
  80 /* Override all DAC access, including ACL execute access if
  81    [_POSIX_ACL] is defined. Excluding DAC access covered by
  82    CAP_LINUX_IMMUTABLE. */
  83
  84 #define CAP_DAC_OVERRIDE     1
  85
  86 /* Overrides all DAC restrictions regarding read and search on files
  87    and directories, including ACL restrictions if [_POSIX_ACL] is
  88    defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
  89
  90 #define CAP_DAC_READ_SEARCH  2
  91
  92 /* Overrides all restrictions about allowed operations on files, where
  93    file owner ID must be equal to the user ID, except where CAP_FSETID
  94    is applicable. It doesn't override MAC and DAC restrictions. */
  95
  96 #define CAP_FOWNER           3
  97
  98 /* Overrides the following restrictions that the effective user ID
  99    shall match the file owner ID when setting the S_ISUID and S_ISGID
 100    bits on that file; that the effective group ID (or one of the
 101    supplementary group IDs) shall match the file owner ID when setting
 102    the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
 103    cleared on successful return from chown(2) (not implemented). */
 104
 105 #define CAP_FSETID           4
 106
 107 /* Used to decide between falling back on the old suser() or fsuser(). */
 108
 109 #define CAP_FS_MASK          0x1f
 110
 111 /* Overrides the restriction that the real or effective user ID of a
 112    process sending a signal must match the real or effective user ID
 113    of the process receiving the signal. */
 114
 115 #define CAP_KILL             5
 116
 117 /* Allows setgid(2) manipulation */
 118 /* Allows setgroups(2) */
 119 /* Allows forged gids on socket credentials passing. */
 120
 121 #define CAP_SETGID           6
 122
 123 /* Allows set*uid(2) manipulation (including fsuid). */
 124 /* Allows forged pids on socket credentials passing. */
 125
 126 #define CAP_SETUID           7
 127
 128
 129 /**
 130  ** Linux-specific capabilities
 131  **/
 132
 133 /* Transfer any capability in your permitted set to any pid,
 134    remove any capability in your permitted set from any pid */
 135
 136 #define CAP_SETPCAP          8
 137
 138 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
 139
 140 #define CAP_LINUX_IMMUTABLE  9
 141
 142 /* Allows binding to TCP/UDP sockets below 1024 */
 143 /* Allows binding to ATM VCIs below 32 */
 144
 145 #define CAP_NET_BIND_SERVICE 10
 146
 147 /* Allow broadcasting, listen to multicast */
 148
 149 #define CAP_NET_BROADCAST    11
 150
 151 /* Allow interface configuration */
 152 /* Allow administration of IP firewall, masquerading and accounting */
 153 /* Allow setting debug option on sockets */
 154 /* Allow modification of routing tables */
 155 /* Allow setting arbitrary process / process group ownership on
 156    sockets */
 157 /* Allow binding to any address for transparent proxying */
 158 /* Allow setting TOS (type of service) */
 159 /* Allow setting promiscuous mode */
 160 /* Allow clearing driver statistics */
 161 /* Allow multicasting */
 162 /* Allow read/write of device-specific registers */
 163 /* Allow activation of ATM control sockets */
 164
 165 #define CAP_NET_ADMIN        12
 166
 167 /* Allow use of RAW sockets */
 168 /* Allow use of PACKET sockets */
 169
 170 #define CAP_NET_RAW          13
 171
 172 /* Allow locking of shared memory segments */
 173 /* Allow mlock and mlockall (which doesn't really have anything to do
 174    with IPC) */
 175
 176 #define CAP_IPC_LOCK         14
 177
 178 /* Override IPC ownership checks */
 179
 180 #define CAP_IPC_OWNER        15
 181
 182 /* Insert and remove kernel modules - modify kernel without limit */
 183 /* Modify cap_bset */
 184 #define CAP_SYS_MODULE       16
 185
 186 /* Allow ioperm/iopl access */
 187 /* Allow sending USB messages to any device via /proc/bus/usb */
 188
 189 #define CAP_SYS_RAWIO        17
 190
 191 /* Allow use of chroot() */
 192
 193 #define CAP_SYS_CHROOT       18
 194
 195 /* Allow ptrace() of any process */
 196
 197 #define CAP_SYS_PTRACE       19
 198
 199 /* Allow configuration of process accounting */
 200
 201 #define CAP_SYS_PACCT        20
 202
 203 /* Allow configuration of the secure attention key */
 204 /* Allow administration of the random device */
 205 /* Allow examination and configuration of disk quotas */
 206 /* Allow configuring the kernel's syslog (printk behaviour) */
 207 /* Allow setting the domainname */
 208 /* Allow setting the hostname */
 209 /* Allow calling bdflush() */
 210 /* Allow mount() and umount(), setting up new smb connection */
 211 /* Allow some autofs root ioctls */
 212 /* Allow nfsservctl */
 213 /* Allow VM86_REQUEST_IRQ */
 214 /* Allow to read/write pci config on alpha */
 215 /* Allow irix_prctl on mips (setstacksize) */
 216 /* Allow flushing all cache on m68k (sys_cacheflush) */
 217 /* Allow removing semaphores */
 218 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
 219    and shared memory */
 220 /* Allow locking/unlocking of shared memory segment */
 221 /* Allow turning swap on/off */
 222 /* Allow forged pids on socket credentials passing */
 223 /* Allow setting readahead and flushing buffers on block devices */
 224 /* Allow setting geometry in floppy driver */
 225 /* Allow turning DMA on/off in xd driver */
 226 /* Allow administration of md devices (mostly the above, but some
 227    extra ioctls) */
 228 /* Allow tuning the ide driver */
 229 /* Allow access to the nvram device */
 230 /* Allow administration of apm_bios, serial and bttv (TV) device */
 231 /* Allow manufacturer commands in isdn CAPI support driver */
 232 /* Allow reading non-standardized portions of pci configuration space */
 233 /* Allow DDI debug ioctl on sbpcd driver */
 234 /* Allow setting up serial ports */
 235 /* Allow sending raw qic-117 commands */
 236 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending
 237    arbitrary SCSI commands */
 238 /* Allow setting encryption key on loopback filesystem */
 239 /* Allow setting zone reclaim policy */
 240
 241 #define CAP_SYS_ADMIN        21
 242
 243 /* Allow use of reboot() */
 244
 245 #define CAP_SYS_BOOT         22
 246
 247 /* Allow raising priority and setting priority on other (different
 248    UID) processes */
 249 /* Allow use of FIFO and round-robin (realtime) scheduling on own
 250    processes and setting the scheduling algorithm used by another
 251    process. */
 252 /* Allow setting cpu affinity on other processes */
 253
 254 #define CAP_SYS_NICE         23
 255
 256 /* Override resource limits. Set resource limits. */
 257 /* Override quota limits. */
 258 /* Override reserved space on ext2 filesystem */
 259 /* Modify data journaling mode on ext3 filesystem (uses journaling
 260    resources) */
 261 /* NOTE: ext2 honors fsuid when checking for resource overrides, so
 262    you can override using fsuid too */
 263 /* Override size restrictions on IPC message queues */
 264 /* Allow more than 64hz interrupts from the real-time clock */
 265 /* Override max number of consoles on console allocation */
 266 /* Override max number of keymaps */
 267
 268 #define CAP_SYS_RESOURCE     24
 269
 270 /* Allow manipulation of system clock */
 271 /* Allow irix_stime on mips */
 272 /* Allow setting the real-time clock */
 273
 274 #define CAP_SYS_TIME         25
 275
 276 /* Allow configuration of tty devices */
 277 /* Allow vhangup() of tty */
 278
 279 #define CAP_SYS_TTY_CONFIG   26
 280
 281 /* Allow the privileged aspects of mknod() */
 282
 283 #define CAP_MKNOD            27
 284
 285 /* Allow taking of leases on files */
 286
 287 #define CAP_LEASE            28
 288
 289 #define CAP_AUDIT_WRITE      29
 290
 291 #define CAP_AUDIT_CONTROL    30
 292
 293 #ifdef __KERNEL__
 294 /*
 295  * Bounding set
 296  */
 297 extern kernel_cap_t cap_bset;
 298
 299 /*
 300  * Internal kernel functions only
 301  */
 302
 303 #ifdef STRICT_CAP_T_TYPECHECKS
 304
 305 #define to_cap_t(x) { x }
 306 #define cap_t(x) (x).cap
 307
 308 #else
 309
 310 #define to_cap_t(x) (x)
 311 #define cap_t(x) (x)
 312
 313 #endif
 314
 315 #define CAP_EMPTY_SET       to_cap_t(0)
 316 #define CAP_FULL_SET        to_cap_t(~0)
 317 #define CAP_INIT_EFF_SET    to_cap_t(~0 & ~CAP_TO_MASK(CAP_SETPCAP))
 318 #define CAP_INIT_INH_SET    to_cap_t(0)
 319
 320 #define CAP_TO_MASK(x) (1 << (x))
 321 #define cap_raise(c, flag)   (cap_t(c) |=  CAP_TO_MASK(flag))
 322 #define cap_lower(c, flag)   (cap_t(c) &= ~CAP_TO_MASK(flag))
 323 #define cap_raised(c, flag)  (cap_t(c) & CAP_TO_MASK(flag))
 324
 325 static inline kernel_cap_t cap_combine(kernel_cap_t a, kernel_cap_t b)
 326 {
 327      kernel_cap_t dest;
 328      cap_t(dest) = cap_t(a) | cap_t(b);
 329      return dest;
 330 }
 331
 332 static inline kernel_cap_t cap_intersect(kernel_cap_t a, kernel_cap_t b)
 333 {
 334      kernel_cap_t dest;
 335      cap_t(dest) = cap_t(a) & cap_t(b);
 336      return dest;
 337 }
 338
 339 static inline kernel_cap_t cap_drop(kernel_cap_t a, kernel_cap_t drop)
 340 {
 341      kernel_cap_t dest;
 342      cap_t(dest) = cap_t(a) & ~cap_t(drop);
 343      return dest;
 344 }
 345
 346 static inline kernel_cap_t cap_invert(kernel_cap_t c)
 347 {
 348      kernel_cap_t dest;
 349      cap_t(dest) = ~cap_t(c);
 350      return dest;
 351 }
 352
 353 #define cap_isclear(c)       (!cap_t(c))
 354 #define cap_issubset(a,set)  (!(cap_t(a) & ~cap_t(set)))
 355
 356 #define cap_clear(c)         do { cap_t(c) =  0; } while(0)
 357 #define cap_set_full(c)      do { cap_t(c) = ~0; } while(0)
 358 #define cap_mask(c,mask)     do { cap_t(c) &= cap_t(mask); } while(0)
 359
 360 #define cap_is_fs_cap(c)     (CAP_TO_MASK(c) & CAP_FS_MASK)
 361
 362 int capable(int cap);
 363 int __capable(struct task_struct *t, int cap);
 364
 365 #endif /* __KERNEL__ */
 366
 367 #endif /* !_LINUX_CAPABILITY_H */