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/rcupdate.h>
  17 #include <linux/refcount.h>
  18 #include <linux/workqueue.h>
  19 #include "flask.h"
  20 #include "policycap.h"
  21
  22 #define SECSID_NULL                     0x00000000 /* unspecified SID */
  23 #define SECSID_WILD                     0xffffffff /* wildcard SID */
  24 #define SECCLASS_NULL                   0x0000 /* no class */
  25
  26 /* Identify specific policy version changes */
  27 #define POLICYDB_VERSION_BASE           15
  28 #define POLICYDB_VERSION_BOOL           16
  29 #define POLICYDB_VERSION_IPV6           17
  30 #define POLICYDB_VERSION_NLCLASS        18
  31 #define POLICYDB_VERSION_VALIDATETRANS  19
  32 #define POLICYDB_VERSION_MLS            19
  33 #define POLICYDB_VERSION_AVTAB          20
  34 #define POLICYDB_VERSION_RANGETRANS     21
  35 #define POLICYDB_VERSION_POLCAP         22
  36 #define POLICYDB_VERSION_PERMISSIVE     23
  37 #define POLICYDB_VERSION_BOUNDARY       24
  38 #define POLICYDB_VERSION_FILENAME_TRANS 25
  39 #define POLICYDB_VERSION_ROLETRANS      26
  40 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS    27
  41 #define POLICYDB_VERSION_DEFAULT_TYPE   28
  42 #define POLICYDB_VERSION_CONSTRAINT_NAMES       29
  43 #define POLICYDB_VERSION_XPERMS_IOCTL   30
  44 #define POLICYDB_VERSION_INFINIBAND             31
  45 #define POLICYDB_VERSION_GLBLUB         32
  46 #define POLICYDB_VERSION_COMP_FTRANS    33 /* compressed filename transitions */
  47
  48 /* Range of policy versions we understand*/
  49 #define POLICYDB_VERSION_MIN   POLICYDB_VERSION_BASE
  50 #define POLICYDB_VERSION_MAX   POLICYDB_VERSION_COMP_FTRANS
  51
  52 /* Mask for just the mount related flags */
  53 #define SE_MNTMASK      0x0f
  54 /* Super block security struct flags for mount options */
  55 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
  56 #define CONTEXT_MNT     0x01
  57 #define FSCONTEXT_MNT   0x02
  58 #define ROOTCONTEXT_MNT 0x04
  59 #define DEFCONTEXT_MNT  0x08
  60 #define SBLABEL_MNT     0x10
  61 /* Non-mount related flags */
  62 #define SE_SBINITIALIZED        0x0100
  63 #define SE_SBPROC               0x0200
  64 #define SE_SBGENFS              0x0400
  65 #define SE_SBGENFS_XATTR        0x0800
  66
  67 #define CONTEXT_STR     "context"
  68 #define FSCONTEXT_STR   "fscontext"
  69 #define ROOTCONTEXT_STR "rootcontext"
  70 #define DEFCONTEXT_STR  "defcontext"
  71 #define SECLABEL_STR "seclabel"
  72
  73 struct netlbl_lsm_secattr;
  74
  75 extern int selinux_enabled_boot;
  76
  77 /*
  78  * type_datum properties
  79  * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
  80  */
  81 #define TYPEDATUM_PROPERTY_PRIMARY      0x0001
  82 #define TYPEDATUM_PROPERTY_ATTRIBUTE    0x0002
  83
  84 /* limitation of boundary depth  */
  85 #define POLICYDB_BOUNDS_MAXDEPTH        4
  86
  87 struct selinux_avc;
  88 struct selinux_policy;
  89
  90 struct selinux_state {
  91 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
  92         bool disabled;
  93 #endif
  94 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
  95         bool enforcing;
  96 #endif
  97         bool checkreqprot;
  98         bool initialized;
  99         bool policycap[__POLICYDB_CAPABILITY_MAX];
 100
 101         struct page *status_page;
 102         struct mutex status_lock;
 103
 104         struct selinux_avc *avc;
 105         struct selinux_policy __rcu *policy;
 106         struct mutex policy_mutex;
 107 } __randomize_layout;
 108
 109 void selinux_avc_init(struct selinux_avc **avc);
 110
 111 extern struct selinux_state selinux_state;
 112
 113 static inline bool selinux_initialized(const struct selinux_state *state)
 114 {
 115         /* do a synchronized load to avoid race conditions */
 116         return smp_load_acquire(&state->initialized);
 117 }
 118
 119 static inline void selinux_mark_initialized(struct selinux_state *state)
 120 {
 121         /* do a synchronized write to avoid race conditions */
 122         smp_store_release(&state->initialized, true);
 123 }
 124
 125 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 126 static inline bool enforcing_enabled(struct selinux_state *state)
 127 {
 128         return READ_ONCE(state->enforcing);
 129 }
 130
 131 static inline void enforcing_set(struct selinux_state *state, bool value)
 132 {
 133         WRITE_ONCE(state->enforcing, value);
 134 }
 135 #else
 136 static inline bool enforcing_enabled(struct selinux_state *state)
 137 {
 138         return true;
 139 }
 140
 141 static inline void enforcing_set(struct selinux_state *state, bool value)
 142 {
 143 }
 144 #endif
 145
 146 static inline bool checkreqprot_get(const struct selinux_state *state)
 147 {
 148         return READ_ONCE(state->checkreqprot);
 149 }
 150
 151 static inline void checkreqprot_set(struct selinux_state *state, bool value)
 152 {
 153         WRITE_ONCE(state->checkreqprot, value);
 154 }
 155
 156 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 157 static inline bool selinux_disabled(struct selinux_state *state)
 158 {
 159         return READ_ONCE(state->disabled);
 160 }
 161
 162 static inline void selinux_mark_disabled(struct selinux_state *state)
 163 {
 164         WRITE_ONCE(state->disabled, true);
 165 }
 166 #else
 167 static inline bool selinux_disabled(struct selinux_state *state)
 168 {
 169         return false;
 170 }
 171 #endif
 172
 173 static inline bool selinux_policycap_netpeer(void)
 174 {
 175         struct selinux_state *state = &selinux_state;
 176
 177         return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NETPEER]);
 178 }
 179
 180 static inline bool selinux_policycap_openperm(void)
 181 {
 182         struct selinux_state *state = &selinux_state;
 183
 184         return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_OPENPERM]);
 185 }
 186
 187 static inline bool selinux_policycap_extsockclass(void)
 188 {
 189         struct selinux_state *state = &selinux_state;
 190
 191         return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS]);
 192 }
 193
 194 static inline bool selinux_policycap_alwaysnetwork(void)
 195 {
 196         struct selinux_state *state = &selinux_state;
 197
 198         return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK]);
 199 }
 200
 201 static inline bool selinux_policycap_cgroupseclabel(void)
 202 {
 203         struct selinux_state *state = &selinux_state;
 204
 205         return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL]);
 206 }
 207
 208 static inline bool selinux_policycap_nnp_nosuid_transition(void)
 209 {
 210         struct selinux_state *state = &selinux_state;
 211
 212         return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION]);
 213 }
 214
 215 static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
 216 {
 217         struct selinux_state *state = &selinux_state;
 218
 219         return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS]);
 220 }
 221
 222 int security_mls_enabled(struct selinux_state *state);
 223 int security_load_policy(struct selinux_state *state,
 224                         void *data, size_t len,
 225                         struct selinux_policy **newpolicyp);
 226 void selinux_policy_commit(struct selinux_state *state,
 227                         struct selinux_policy *newpolicy);
 228 void selinux_policy_cancel(struct selinux_state *state,
 229                         struct selinux_policy *policy);
 230 int security_read_policy(struct selinux_state *state,
 231                          void **data, size_t *len);
 232
 233 int security_policycap_supported(struct selinux_state *state,
 234                                  unsigned int req_cap);
 235
 236 #define SEL_VEC_MAX 32
 237 struct av_decision {
 238         u32 allowed;
 239         u32 auditallow;
 240         u32 auditdeny;
 241         u32 seqno;
 242         u32 flags;
 243 };
 244
 245 #define XPERMS_ALLOWED 1
 246 #define XPERMS_AUDITALLOW 2
 247 #define XPERMS_DONTAUDIT 4
 248
 249 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
 250 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
 251 struct extended_perms_data {
 252         u32 p[8];
 253 };
 254
 255 struct extended_perms_decision {
 256         u8 used;
 257         u8 driver;
 258         struct extended_perms_data *allowed;
 259         struct extended_perms_data *auditallow;
 260         struct extended_perms_data *dontaudit;
 261 };
 262
 263 struct extended_perms {
 264         u16 len;        /* length associated decision chain */
 265         struct extended_perms_data drivers; /* flag drivers that are used */
 266 };
 267
 268 /* definitions of av_decision.flags */
 269 #define AVD_FLAGS_PERMISSIVE    0x0001
 270
 271 void security_compute_av(struct selinux_state *state,
 272                          u32 ssid, u32 tsid,
 273                          u16 tclass, struct av_decision *avd,
 274                          struct extended_perms *xperms);
 275
 276 void security_compute_xperms_decision(struct selinux_state *state,
 277                                       u32 ssid, u32 tsid, u16 tclass,
 278                                       u8 driver,
 279                                       struct extended_perms_decision *xpermd);
 280
 281 void security_compute_av_user(struct selinux_state *state,
 282                               u32 ssid, u32 tsid,
 283                               u16 tclass, struct av_decision *avd);
 284
 285 int security_transition_sid(struct selinux_state *state,
 286                             u32 ssid, u32 tsid, u16 tclass,
 287                             const struct qstr *qstr, u32 *out_sid);
 288
 289 int security_transition_sid_user(struct selinux_state *state,
 290                                  u32 ssid, u32 tsid, u16 tclass,
 291                                  const char *objname, u32 *out_sid);
 292
 293 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
 294                         u16 tclass, u32 *out_sid);
 295
 296 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
 297                         u16 tclass, u32 *out_sid);
 298
 299 int security_sid_to_context(struct selinux_state *state, u32 sid,
 300                             char **scontext, u32 *scontext_len);
 301
 302 int security_sid_to_context_force(struct selinux_state *state,
 303                                   u32 sid, char **scontext, u32 *scontext_len);
 304
 305 int security_sid_to_context_inval(struct selinux_state *state,
 306                                   u32 sid, char **scontext, u32 *scontext_len);
 307
 308 int security_context_to_sid(struct selinux_state *state,
 309                             const char *scontext, u32 scontext_len,
 310                             u32 *out_sid, gfp_t gfp);
 311
 312 int security_context_str_to_sid(struct selinux_state *state,
 313                                 const char *scontext, u32 *out_sid, gfp_t gfp);
 314
 315 int security_context_to_sid_default(struct selinux_state *state,
 316                                     const char *scontext, u32 scontext_len,
 317                                     u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
 318
 319 int security_context_to_sid_force(struct selinux_state *state,
 320                                   const char *scontext, u32 scontext_len,
 321                                   u32 *sid);
 322
 323 int security_get_user_sids(struct selinux_state *state,
 324                            u32 callsid, char *username,
 325                            u32 **sids, u32 *nel);
 326
 327 int security_port_sid(struct selinux_state *state,
 328                       u8 protocol, u16 port, u32 *out_sid);
 329
 330 int security_ib_pkey_sid(struct selinux_state *state,
 331                          u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
 332
 333 int security_ib_endport_sid(struct selinux_state *state,
 334                             const char *dev_name, u8 port_num, u32 *out_sid);
 335
 336 int security_netif_sid(struct selinux_state *state,
 337                        char *name, u32 *if_sid);
 338
 339 int security_node_sid(struct selinux_state *state,
 340                       u16 domain, void *addr, u32 addrlen,
 341                       u32 *out_sid);
 342
 343 int security_validate_transition(struct selinux_state *state,
 344                                  u32 oldsid, u32 newsid, u32 tasksid,
 345                                  u16 tclass);
 346
 347 int security_validate_transition_user(struct selinux_state *state,
 348                                       u32 oldsid, u32 newsid, u32 tasksid,
 349                                       u16 tclass);
 350
 351 int security_bounded_transition(struct selinux_state *state,
 352                                 u32 oldsid, u32 newsid);
 353
 354 int security_sid_mls_copy(struct selinux_state *state,
 355                           u32 sid, u32 mls_sid, u32 *new_sid);
 356
 357 int security_net_peersid_resolve(struct selinux_state *state,
 358                                  u32 nlbl_sid, u32 nlbl_type,
 359                                  u32 xfrm_sid,
 360                                  u32 *peer_sid);
 361
 362 int security_get_classes(struct selinux_policy *policy,
 363                          char ***classes, int *nclasses);
 364 int security_get_permissions(struct selinux_policy *policy,
 365                              char *class, char ***perms, int *nperms);
 366 int security_get_reject_unknown(struct selinux_state *state);
 367 int security_get_allow_unknown(struct selinux_state *state);
 368
 369 #define SECURITY_FS_USE_XATTR           1 /* use xattr */
 370 #define SECURITY_FS_USE_TRANS           2 /* use transition SIDs, e.g. devpts/tmpfs */
 371 #define SECURITY_FS_USE_TASK            3 /* use task SIDs, e.g. pipefs/sockfs */
 372 #define SECURITY_FS_USE_GENFS           4 /* use the genfs support */
 373 #define SECURITY_FS_USE_NONE            5 /* no labeling support */
 374 #define SECURITY_FS_USE_MNTPOINT        6 /* use mountpoint labeling */
 375 #define SECURITY_FS_USE_NATIVE          7 /* use native label support */
 376 #define SECURITY_FS_USE_MAX             7 /* Highest SECURITY_FS_USE_XXX */
 377
 378 int security_fs_use(struct selinux_state *state, struct super_block *sb);
 379
 380 int security_genfs_sid(struct selinux_state *state,
 381                        const char *fstype, char *name, u16 sclass,
 382                        u32 *sid);
 383
 384 int selinux_policy_genfs_sid(struct selinux_policy *policy,
 385                        const char *fstype, char *name, u16 sclass,
 386                        u32 *sid);
 387
 388 #ifdef CONFIG_NETLABEL
 389 int security_netlbl_secattr_to_sid(struct selinux_state *state,
 390                                    struct netlbl_lsm_secattr *secattr,
 391                                    u32 *sid);
 392
 393 int security_netlbl_sid_to_secattr(struct selinux_state *state,
 394                                    u32 sid,
 395                                    struct netlbl_lsm_secattr *secattr);
 396 #else
 397 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
 398                                             struct netlbl_lsm_secattr *secattr,
 399                                             u32 *sid)
 400 {
 401         return -EIDRM;
 402 }
 403
 404 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
 405                                          u32 sid,
 406                                          struct netlbl_lsm_secattr *secattr)
 407 {
 408         return -ENOENT;
 409 }
 410 #endif /* CONFIG_NETLABEL */
 411
 412 const char *security_get_initial_sid_context(u32 sid);
 413
 414 /*
 415  * status notifier using mmap interface
 416  */
 417 extern struct page *selinux_kernel_status_page(struct selinux_state *state);
 418
 419 #define SELINUX_KERNEL_STATUS_VERSION   1
 420 struct selinux_kernel_status {
 421         u32     version;        /* version number of thie structure */
 422         u32     sequence;       /* sequence number of seqlock logic */
 423         u32     enforcing;      /* current setting of enforcing mode */
 424         u32     policyload;     /* times of policy reloaded */
 425         u32     deny_unknown;   /* current setting of deny_unknown */
 426         /*
 427          * The version > 0 supports above members.
 428          */
 429 } __packed;
 430
 431 extern void selinux_status_update_setenforce(struct selinux_state *state,
 432                                              int enforcing);
 433 extern void selinux_status_update_policyload(struct selinux_state *state,
 434                                              int seqno);
 435 extern void selinux_complete_init(void);
 436 extern int selinux_disable(struct selinux_state *state);
 437 extern void exit_sel_fs(void);
 438 extern struct path selinux_null;
 439 extern struct vfsmount *selinuxfs_mount;
 440 extern void selnl_notify_setenforce(int val);
 441 extern void selnl_notify_policyload(u32 seqno);
 442 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 443
 444 extern void avtab_cache_init(void);
 445 extern void ebitmap_cache_init(void);
 446 extern void hashtab_cache_init(void);
 447 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
 448
 449 #endif /* _SELINUX_SECURITY_H_ */