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