security/selinux/include/security.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Security server interface.
   4  *
   5  * Author : Stephen Smalley, <sds@tycho.nsa.gov>
   6  *
   7  */
   8
   9 #ifndef _SELINUX_SECURITY_H_
  10 #define _SELINUX_SECURITY_H_
  11
  12 #include <linux/compiler.h>
  13 #include <linux/dcache.h>
  14 #include <linux/magic.h>
  15 #include <linux/types.h>
  16 #include <linux/refcount.h>
  17 #include <linux/workqueue.h>
  18 #include "flask.h"
  19
  20 #define SECSID_NULL                     0x00000000 /* unspecified SID */
  21 #define SECSID_WILD                     0xffffffff /* wildcard SID */
  22 #define SECCLASS_NULL                   0x0000 /* no class */
  23
  24 /* Identify specific policy version changes */
  25 #define POLICYDB_VERSION_BASE           15
  26 #define POLICYDB_VERSION_BOOL           16
  27 #define POLICYDB_VERSION_IPV6           17
  28 #define POLICYDB_VERSION_NLCLASS        18
  29 #define POLICYDB_VERSION_VALIDATETRANS  19
  30 #define POLICYDB_VERSION_MLS            19
  31 #define POLICYDB_VERSION_AVTAB          20
  32 #define POLICYDB_VERSION_RANGETRANS     21
  33 #define POLICYDB_VERSION_POLCAP         22
  34 #define POLICYDB_VERSION_PERMISSIVE     23
  35 #define POLICYDB_VERSION_BOUNDARY       24
  36 #define POLICYDB_VERSION_FILENAME_TRANS 25
  37 #define POLICYDB_VERSION_ROLETRANS      26
  38 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS    27
  39 #define POLICYDB_VERSION_DEFAULT_TYPE   28
  40 #define POLICYDB_VERSION_CONSTRAINT_NAMES       29
  41 #define POLICYDB_VERSION_XPERMS_IOCTL   30
  42 #define POLICYDB_VERSION_INFINIBAND             31
  43 #define POLICYDB_VERSION_GLBLUB         32
  44
  45 /* Range of policy versions we understand*/
  46 #define POLICYDB_VERSION_MIN   POLICYDB_VERSION_BASE
  47 #define POLICYDB_VERSION_MAX   POLICYDB_VERSION_GLBLUB
  48
  49 /* Mask for just the mount related flags */
  50 #define SE_MNTMASK      0x0f
  51 /* Super block security struct flags for mount options */
  52 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
  53 #define CONTEXT_MNT     0x01
  54 #define FSCONTEXT_MNT   0x02
  55 #define ROOTCONTEXT_MNT 0x04
  56 #define DEFCONTEXT_MNT  0x08
  57 #define SBLABEL_MNT     0x10
  58 /* Non-mount related flags */
  59 #define SE_SBINITIALIZED        0x0100
  60 #define SE_SBPROC               0x0200
  61 #define SE_SBGENFS              0x0400
  62 #define SE_SBGENFS_XATTR        0x0800
  63
  64 #define CONTEXT_STR     "context"
  65 #define FSCONTEXT_STR   "fscontext"
  66 #define ROOTCONTEXT_STR "rootcontext"
  67 #define DEFCONTEXT_STR  "defcontext"
  68 #define SECLABEL_STR "seclabel"
  69
  70 struct netlbl_lsm_secattr;
  71
  72 extern int selinux_enabled_boot;
  73
  74 /* Policy capabilities */
  75 enum {
  76         POLICYDB_CAPABILITY_NETPEER,
  77         POLICYDB_CAPABILITY_OPENPERM,
  78         POLICYDB_CAPABILITY_EXTSOCKCLASS,
  79         POLICYDB_CAPABILITY_ALWAYSNETWORK,
  80         POLICYDB_CAPABILITY_CGROUPSECLABEL,
  81         POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION,
  82         POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS,
  83         __POLICYDB_CAPABILITY_MAX
  84 };
  85 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
  86
  87 extern const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX];
  88
  89 /*
  90  * type_datum properties
  91  * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
  92  */
  93 #define TYPEDATUM_PROPERTY_PRIMARY      0x0001
  94 #define TYPEDATUM_PROPERTY_ATTRIBUTE    0x0002
  95
  96 /* limitation of boundary depth  */
  97 #define POLICYDB_BOUNDS_MAXDEPTH        4
  98
  99 struct selinux_avc;
 100 struct selinux_ss;
 101
 102 struct selinux_state {
 103 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 104         bool disabled;
 105 #endif
 106 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 107         bool enforcing;
 108 #endif
 109         bool checkreqprot;
 110         bool initialized;
 111         bool policycap[__POLICYDB_CAPABILITY_MAX];
 112
 113         struct page *status_page;
 114         struct mutex status_lock;
 115
 116         struct selinux_avc *avc;
 117         struct selinux_ss *ss;
 118 } __randomize_layout;
 119
 120 void selinux_ss_init(struct selinux_ss **ss);
 121 void selinux_avc_init(struct selinux_avc **avc);
 122
 123 extern struct selinux_state selinux_state;
 124
 125 static inline bool selinux_initialized(const struct selinux_state *state)
 126 {
 127         /* do a synchronized load to avoid race conditions */
 128         return smp_load_acquire(&state->initialized);
 129 }
 130
 131 static inline void selinux_mark_initialized(struct selinux_state *state)
 132 {
 133         /* do a synchronized write to avoid race conditions */
 134         smp_store_release(&state->initialized, true);
 135 }
 136
 137 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 138 static inline bool enforcing_enabled(struct selinux_state *state)
 139 {
 140         return READ_ONCE(state->enforcing);
 141 }
 142
 143 static inline void enforcing_set(struct selinux_state *state, bool value)
 144 {
 145         WRITE_ONCE(state->enforcing, value);
 146 }
 147 #else
 148 static inline bool enforcing_enabled(struct selinux_state *state)
 149 {
 150         return true;
 151 }
 152
 153 static inline void enforcing_set(struct selinux_state *state, bool value)
 154 {
 155 }
 156 #endif
 157
 158 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 159 static inline bool selinux_disabled(struct selinux_state *state)
 160 {
 161         return READ_ONCE(state->disabled);
 162 }
 163
 164 static inline void selinux_mark_disabled(struct selinux_state *state)
 165 {
 166         WRITE_ONCE(state->disabled, true);
 167 }
 168 #else
 169 static inline bool selinux_disabled(struct selinux_state *state)
 170 {
 171         return false;
 172 }
 173 #endif
 174
 175 static inline bool selinux_policycap_netpeer(void)
 176 {
 177         struct selinux_state *state = &selinux_state;
 178
 179         return state->policycap[POLICYDB_CAPABILITY_NETPEER];
 180 }
 181
 182 static inline bool selinux_policycap_openperm(void)
 183 {
 184         struct selinux_state *state = &selinux_state;
 185
 186         return state->policycap[POLICYDB_CAPABILITY_OPENPERM];
 187 }
 188
 189 static inline bool selinux_policycap_extsockclass(void)
 190 {
 191         struct selinux_state *state = &selinux_state;
 192
 193         return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS];
 194 }
 195
 196 static inline bool selinux_policycap_alwaysnetwork(void)
 197 {
 198         struct selinux_state *state = &selinux_state;
 199
 200         return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK];
 201 }
 202
 203 static inline bool selinux_policycap_cgroupseclabel(void)
 204 {
 205         struct selinux_state *state = &selinux_state;
 206
 207         return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL];
 208 }
 209
 210 static inline bool selinux_policycap_nnp_nosuid_transition(void)
 211 {
 212         struct selinux_state *state = &selinux_state;
 213
 214         return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION];
 215 }
 216
 217 static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
 218 {
 219         struct selinux_state *state = &selinux_state;
 220
 221         return state->policycap[POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS];
 222 }
 223
 224 int security_mls_enabled(struct selinux_state *state);
 225 int security_load_policy(struct selinux_state *state,
 226                          void *data, size_t len);
 227 int security_read_policy(struct selinux_state *state,
 228                          void **data, size_t *len);
 229 size_t security_policydb_len(struct selinux_state *state);
 230
 231 int security_policycap_supported(struct selinux_state *state,
 232                                  unsigned int req_cap);
 233
 234 #define SEL_VEC_MAX 32
 235 struct av_decision {
 236         u32 allowed;
 237         u32 auditallow;
 238         u32 auditdeny;
 239         u32 seqno;
 240         u32 flags;
 241 };
 242
 243 #define XPERMS_ALLOWED 1
 244 #define XPERMS_AUDITALLOW 2
 245 #define XPERMS_DONTAUDIT 4
 246
 247 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
 248 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
 249 struct extended_perms_data {
 250         u32 p[8];
 251 };
 252
 253 struct extended_perms_decision {
 254         u8 used;
 255         u8 driver;
 256         struct extended_perms_data *allowed;
 257         struct extended_perms_data *auditallow;
 258         struct extended_perms_data *dontaudit;
 259 };
 260
 261 struct extended_perms {
 262         u16 len;        /* length associated decision chain */
 263         struct extended_perms_data drivers; /* flag drivers that are used */
 264 };
 265
 266 /* definitions of av_decision.flags */
 267 #define AVD_FLAGS_PERMISSIVE    0x0001
 268
 269 void security_compute_av(struct selinux_state *state,
 270                          u32 ssid, u32 tsid,
 271                          u16 tclass, struct av_decision *avd,
 272                          struct extended_perms *xperms);
 273
 274 void security_compute_xperms_decision(struct selinux_state *state,
 275                                       u32 ssid, u32 tsid, u16 tclass,
 276                                       u8 driver,
 277                                       struct extended_perms_decision *xpermd);
 278
 279 void security_compute_av_user(struct selinux_state *state,
 280                               u32 ssid, u32 tsid,
 281                               u16 tclass, struct av_decision *avd);
 282
 283 int security_transition_sid(struct selinux_state *state,
 284                             u32 ssid, u32 tsid, u16 tclass,
 285                             const struct qstr *qstr, u32 *out_sid);
 286
 287 int security_transition_sid_user(struct selinux_state *state,
 288                                  u32 ssid, u32 tsid, u16 tclass,
 289                                  const char *objname, u32 *out_sid);
 290
 291 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
 292                         u16 tclass, u32 *out_sid);
 293
 294 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
 295                         u16 tclass, u32 *out_sid);
 296
 297 int security_sid_to_context(struct selinux_state *state, u32 sid,
 298                             char **scontext, u32 *scontext_len);
 299
 300 int security_sid_to_context_force(struct selinux_state *state,
 301                                   u32 sid, char **scontext, u32 *scontext_len);
 302
 303 int security_sid_to_context_inval(struct selinux_state *state,
 304                                   u32 sid, char **scontext, u32 *scontext_len);
 305
 306 int security_context_to_sid(struct selinux_state *state,
 307                             const char *scontext, u32 scontext_len,
 308                             u32 *out_sid, gfp_t gfp);
 309
 310 int security_context_str_to_sid(struct selinux_state *state,
 311                                 const char *scontext, u32 *out_sid, gfp_t gfp);
 312
 313 int security_context_to_sid_default(struct selinux_state *state,
 314                                     const char *scontext, u32 scontext_len,
 315                                     u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
 316
 317 int security_context_to_sid_force(struct selinux_state *state,
 318                                   const char *scontext, u32 scontext_len,
 319                                   u32 *sid);
 320
 321 int security_get_user_sids(struct selinux_state *state,
 322                            u32 callsid, char *username,
 323                            u32 **sids, u32 *nel);
 324
 325 int security_port_sid(struct selinux_state *state,
 326                       u8 protocol, u16 port, u32 *out_sid);
 327
 328 int security_ib_pkey_sid(struct selinux_state *state,
 329                          u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
 330
 331 int security_ib_endport_sid(struct selinux_state *state,
 332                             const char *dev_name, u8 port_num, u32 *out_sid);
 333
 334 int security_netif_sid(struct selinux_state *state,
 335                        char *name, u32 *if_sid);
 336
 337 int security_node_sid(struct selinux_state *state,
 338                       u16 domain, void *addr, u32 addrlen,
 339                       u32 *out_sid);
 340
 341 int security_validate_transition(struct selinux_state *state,
 342                                  u32 oldsid, u32 newsid, u32 tasksid,
 343                                  u16 tclass);
 344
 345 int security_validate_transition_user(struct selinux_state *state,
 346                                       u32 oldsid, u32 newsid, u32 tasksid,
 347                                       u16 tclass);
 348
 349 int security_bounded_transition(struct selinux_state *state,
 350                                 u32 oldsid, u32 newsid);
 351
 352 int security_sid_mls_copy(struct selinux_state *state,
 353                           u32 sid, u32 mls_sid, u32 *new_sid);
 354
 355 int security_net_peersid_resolve(struct selinux_state *state,
 356                                  u32 nlbl_sid, u32 nlbl_type,
 357                                  u32 xfrm_sid,
 358                                  u32 *peer_sid);
 359
 360 int security_get_classes(struct selinux_state *state,
 361                          char ***classes, int *nclasses);
 362 int security_get_permissions(struct selinux_state *state,
 363                              char *class, char ***perms, int *nperms);
 364 int security_get_reject_unknown(struct selinux_state *state);
 365 int security_get_allow_unknown(struct selinux_state *state);
 366
 367 #define SECURITY_FS_USE_XATTR           1 /* use xattr */
 368 #define SECURITY_FS_USE_TRANS           2 /* use transition SIDs, e.g. devpts/tmpfs */
 369 #define SECURITY_FS_USE_TASK            3 /* use task SIDs, e.g. pipefs/sockfs */
 370 #define SECURITY_FS_USE_GENFS           4 /* use the genfs support */
 371 #define SECURITY_FS_USE_NONE            5 /* no labeling support */
 372 #define SECURITY_FS_USE_MNTPOINT        6 /* use mountpoint labeling */
 373 #define SECURITY_FS_USE_NATIVE          7 /* use native label support */
 374 #define SECURITY_FS_USE_MAX             7 /* Highest SECURITY_FS_USE_XXX */
 375
 376 int security_fs_use(struct selinux_state *state, struct super_block *sb);
 377
 378 int security_genfs_sid(struct selinux_state *state,
 379                        const char *fstype, char *name, u16 sclass,
 380                        u32 *sid);
 381
 382 #ifdef CONFIG_NETLABEL
 383 int security_netlbl_secattr_to_sid(struct selinux_state *state,
 384                                    struct netlbl_lsm_secattr *secattr,
 385                                    u32 *sid);
 386
 387 int security_netlbl_sid_to_secattr(struct selinux_state *state,
 388                                    u32 sid,
 389                                    struct netlbl_lsm_secattr *secattr);
 390 #else
 391 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
 392                                             struct netlbl_lsm_secattr *secattr,
 393                                             u32 *sid)
 394 {
 395         return -EIDRM;
 396 }
 397
 398 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
 399                                          u32 sid,
 400                                          struct netlbl_lsm_secattr *secattr)
 401 {
 402         return -ENOENT;
 403 }
 404 #endif /* CONFIG_NETLABEL */
 405
 406 const char *security_get_initial_sid_context(u32 sid);
 407
 408 /*
 409  * status notifier using mmap interface
 410  */
 411 extern struct page *selinux_kernel_status_page(struct selinux_state *state);
 412
 413 #define SELINUX_KERNEL_STATUS_VERSION   1
 414 struct selinux_kernel_status {
 415         u32     version;        /* version number of thie structure */
 416         u32     sequence;       /* sequence number of seqlock logic */
 417         u32     enforcing;      /* current setting of enforcing mode */
 418         u32     policyload;     /* times of policy reloaded */
 419         u32     deny_unknown;   /* current setting of deny_unknown */
 420         /*
 421          * The version > 0 supports above members.
 422          */
 423 } __packed;
 424
 425 extern void selinux_status_update_setenforce(struct selinux_state *state,
 426                                              int enforcing);
 427 extern void selinux_status_update_policyload(struct selinux_state *state,
 428                                              int seqno);
 429 extern void selinux_complete_init(void);
 430 extern int selinux_disable(struct selinux_state *state);
 431 extern void exit_sel_fs(void);
 432 extern struct path selinux_null;
 433 extern struct vfsmount *selinuxfs_mount;
 434 extern void selnl_notify_setenforce(int val);
 435 extern void selnl_notify_policyload(u32 seqno);
 436 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 437
 438 extern void avtab_cache_init(void);
 439 extern void ebitmap_cache_init(void);
 440 extern void hashtab_cache_init(void);
 441 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
 442
 443 #endif /* _SELINUX_SECURITY_H_ */