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