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