LXR linux/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#define SE_SBGENFS_XATTR        0x0800
  62
  63#define CONTEXT_STR     "context"
  64#define FSCONTEXT_STR   "fscontext"
  65#define ROOTCONTEXT_STR "rootcontext"
  66#define DEFCONTEXT_STR  "defcontext"
  67#define SECLABEL_STR "seclabel"
  68
  69struct netlbl_lsm_secattr;
  70
  71extern int selinux_enabled;
  72
  73/* Policy capabilities */
  74enum {
  75        POLICYDB_CAPABILITY_NETPEER,
  76        POLICYDB_CAPABILITY_OPENPERM,
  77        POLICYDB_CAPABILITY_EXTSOCKCLASS,
  78        POLICYDB_CAPABILITY_ALWAYSNETWORK,
  79        POLICYDB_CAPABILITY_CGROUPSECLABEL,
  80        POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION,
  81        __POLICYDB_CAPABILITY_MAX
  82};
  83#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
  84
  85extern const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX];
  86
  87/*
  88 * type_datum properties
  89 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
  90 */
  91#define TYPEDATUM_PROPERTY_PRIMARY      0x0001
  92#define TYPEDATUM_PROPERTY_ATTRIBUTE    0x0002
  93
  94/* limitation of boundary depth  */
  95#define POLICYDB_BOUNDS_MAXDEPTH        4
  96
  97struct selinux_avc;
  98struct selinux_ss;
  99
 100struct selinux_state {
 101        bool disabled;
 102#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 103        bool enforcing;
 104#endif
 105        bool checkreqprot;
 106        bool initialized;
 107        bool policycap[__POLICYDB_CAPABILITY_MAX];
 108        struct selinux_avc *avc;
 109        struct selinux_ss *ss;
 110};
 111
 112void selinux_ss_init(struct selinux_ss **ss);
 113void selinux_avc_init(struct selinux_avc **avc);
 114
 115extern struct selinux_state selinux_state;
 116
 117#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 118static inline bool enforcing_enabled(struct selinux_state *state)
 119{
 120        return state->enforcing;
 121}
 122
 123static inline void enforcing_set(struct selinux_state *state, bool value)
 124{
 125        state->enforcing = value;
 126}
 127#else
 128static inline bool enforcing_enabled(struct selinux_state *state)
 129{
 130        return true;
 131}
 132
 133static inline void enforcing_set(struct selinux_state *state, bool value)
 134{
 135}
 136#endif
 137
 138static inline bool selinux_policycap_netpeer(void)
 139{
 140        struct selinux_state *state = &selinux_state;
 141
 142        return state->policycap[POLICYDB_CAPABILITY_NETPEER];
 143}
 144
 145static inline bool selinux_policycap_openperm(void)
 146{
 147        struct selinux_state *state = &selinux_state;
 148
 149        return state->policycap[POLICYDB_CAPABILITY_OPENPERM];
 150}
 151
 152static inline bool selinux_policycap_extsockclass(void)
 153{
 154        struct selinux_state *state = &selinux_state;
 155
 156        return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS];
 157}
 158
 159static inline bool selinux_policycap_alwaysnetwork(void)
 160{
 161        struct selinux_state *state = &selinux_state;
 162
 163        return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK];
 164}
 165
 166static inline bool selinux_policycap_cgroupseclabel(void)
 167{
 168        struct selinux_state *state = &selinux_state;
 169
 170        return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL];
 171}
 172
 173static inline bool selinux_policycap_nnp_nosuid_transition(void)
 174{
 175        struct selinux_state *state = &selinux_state;
 176
 177        return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION];
 178}
 179
 180int security_mls_enabled(struct selinux_state *state);
 181int security_load_policy(struct selinux_state *state,
 182                         void *data, size_t len);
 183int security_read_policy(struct selinux_state *state,
 184                         void **data, size_t *len);
 185size_t security_policydb_len(struct selinux_state *state);
 186
 187int security_policycap_supported(struct selinux_state *state,
 188                                 unsigned int req_cap);
 189
 190#define SEL_VEC_MAX 32
 191struct av_decision {
 192        u32 allowed;
 193        u32 auditallow;
 194        u32 auditdeny;
 195        u32 seqno;
 196        u32 flags;
 197};
 198
 199#define XPERMS_ALLOWED 1
 200#define XPERMS_AUDITALLOW 2
 201#define XPERMS_DONTAUDIT 4
 202
 203#define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
 204#define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
 205struct extended_perms_data {
 206        u32 p[8];
 207};
 208
 209struct extended_perms_decision {
 210        u8 used;
 211        u8 driver;
 212        struct extended_perms_data *allowed;
 213        struct extended_perms_data *auditallow;
 214        struct extended_perms_data *dontaudit;
 215};
 216
 217struct extended_perms {
 218        u16 len;        /* length associated decision chain */
 219        struct extended_perms_data drivers; /* flag drivers that are used */
 220};
 221
 222/* definitions of av_decision.flags */
 223#define AVD_FLAGS_PERMISSIVE    0x0001
 224
 225void security_compute_av(struct selinux_state *state,
 226                         u32 ssid, u32 tsid,
 227                         u16 tclass, struct av_decision *avd,
 228                         struct extended_perms *xperms);
 229
 230void security_compute_xperms_decision(struct selinux_state *state,
 231                                      u32 ssid, u32 tsid, u16 tclass,
 232                                      u8 driver,
 233                                      struct extended_perms_decision *xpermd);
 234
 235void security_compute_av_user(struct selinux_state *state,
 236                              u32 ssid, u32 tsid,
 237                              u16 tclass, struct av_decision *avd);
 238
 239int security_transition_sid(struct selinux_state *state,
 240                            u32 ssid, u32 tsid, u16 tclass,
 241                            const struct qstr *qstr, u32 *out_sid);
 242
 243int security_transition_sid_user(struct selinux_state *state,
 244                                 u32 ssid, u32 tsid, u16 tclass,
 245                                 const char *objname, u32 *out_sid);
 246
 247int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
 248                        u16 tclass, u32 *out_sid);
 249
 250int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
 251                        u16 tclass, u32 *out_sid);
 252
 253int security_sid_to_context(struct selinux_state *state, u32 sid,
 254                            char **scontext, u32 *scontext_len);
 255
 256int security_sid_to_context_force(struct selinux_state *state,
 257                                  u32 sid, char **scontext, u32 *scontext_len);
 258
 259int security_sid_to_context_inval(struct selinux_state *state,
 260                                  u32 sid, char **scontext, u32 *scontext_len);
 261
 262int security_context_to_sid(struct selinux_state *state,
 263                            const char *scontext, u32 scontext_len,
 264                            u32 *out_sid, gfp_t gfp);
 265
 266int security_context_str_to_sid(struct selinux_state *state,
 267                                const char *scontext, u32 *out_sid, gfp_t gfp);
 268
 269int security_context_to_sid_default(struct selinux_state *state,
 270                                    const char *scontext, u32 scontext_len,
 271                                    u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
 272
 273int security_context_to_sid_force(struct selinux_state *state,
 274                                  const char *scontext, u32 scontext_len,
 275                                  u32 *sid);
 276
 277int security_get_user_sids(struct selinux_state *state,
 278                           u32 callsid, char *username,
 279                           u32 **sids, u32 *nel);
 280
 281int security_port_sid(struct selinux_state *state,
 282                      u8 protocol, u16 port, u32 *out_sid);
 283
 284int security_ib_pkey_sid(struct selinux_state *state,
 285                         u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
 286
 287int security_ib_endport_sid(struct selinux_state *state,
 288                            const char *dev_name, u8 port_num, u32 *out_sid);
 289
 290int security_netif_sid(struct selinux_state *state,
 291                       char *name, u32 *if_sid);
 292
 293int security_node_sid(struct selinux_state *state,
 294                      u16 domain, void *addr, u32 addrlen,
 295                      u32 *out_sid);
 296
 297int security_validate_transition(struct selinux_state *state,
 298                                 u32 oldsid, u32 newsid, u32 tasksid,
 299                                 u16 tclass);
 300
 301int security_validate_transition_user(struct selinux_state *state,
 302                                      u32 oldsid, u32 newsid, u32 tasksid,
 303                                      u16 tclass);
 304
 305int security_bounded_transition(struct selinux_state *state,
 306                                u32 oldsid, u32 newsid);
 307
 308int security_sid_mls_copy(struct selinux_state *state,
 309                          u32 sid, u32 mls_sid, u32 *new_sid);
 310
 311int security_net_peersid_resolve(struct selinux_state *state,
 312                                 u32 nlbl_sid, u32 nlbl_type,
 313                                 u32 xfrm_sid,
 314                                 u32 *peer_sid);
 315
 316int security_get_classes(struct selinux_state *state,
 317                         char ***classes, int *nclasses);
 318int security_get_permissions(struct selinux_state *state,
 319                             char *class, char ***perms, int *nperms);
 320int security_get_reject_unknown(struct selinux_state *state);
 321int security_get_allow_unknown(struct selinux_state *state);
 322
 323#define SECURITY_FS_USE_XATTR           1 /* use xattr */
 324#define SECURITY_FS_USE_TRANS           2 /* use transition SIDs, e.g. devpts/tmpfs */
 325#define SECURITY_FS_USE_TASK            3 /* use task SIDs, e.g. pipefs/sockfs */
 326#define SECURITY_FS_USE_GENFS           4 /* use the genfs support */
 327#define SECURITY_FS_USE_NONE            5 /* no labeling support */
 328#define SECURITY_FS_USE_MNTPOINT        6 /* use mountpoint labeling */
 329#define SECURITY_FS_USE_NATIVE          7 /* use native label support */
 330#define SECURITY_FS_USE_MAX             7 /* Highest SECURITY_FS_USE_XXX */
 331
 332int security_fs_use(struct selinux_state *state, struct super_block *sb);
 333
 334int security_genfs_sid(struct selinux_state *state,
 335                       const char *fstype, char *name, u16 sclass,
 336                       u32 *sid);
 337
 338#ifdef CONFIG_NETLABEL
 339int security_netlbl_secattr_to_sid(struct selinux_state *state,
 340                                   struct netlbl_lsm_secattr *secattr,
 341                                   u32 *sid);
 342
 343int security_netlbl_sid_to_secattr(struct selinux_state *state,
 344                                   u32 sid,
 345                                   struct netlbl_lsm_secattr *secattr);
 346#else
 347static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
 348                                            struct netlbl_lsm_secattr *secattr,
 349                                            u32 *sid)
 350{
 351        return -EIDRM;
 352}
 353
 354static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
 355                                         u32 sid,
 356                                         struct netlbl_lsm_secattr *secattr)
 357{
 358        return -ENOENT;
 359}
 360#endif /* CONFIG_NETLABEL */
 361
 362const char *security_get_initial_sid_context(u32 sid);
 363
 364/*
 365 * status notifier using mmap interface
 366 */
 367extern struct page *selinux_kernel_status_page(struct selinux_state *state);
 368
 369#define SELINUX_KERNEL_STATUS_VERSION   1
 370struct selinux_kernel_status {
 371        u32     version;        /* version number of thie structure */
 372        u32     sequence;       /* sequence number of seqlock logic */
 373        u32     enforcing;      /* current setting of enforcing mode */
 374        u32     policyload;     /* times of policy reloaded */
 375        u32     deny_unknown;   /* current setting of deny_unknown */
 376        /*
 377         * The version > 0 supports above members.
 378         */
 379} __packed;
 380
 381extern void selinux_status_update_setenforce(struct selinux_state *state,
 382                                             int enforcing);
 383extern void selinux_status_update_policyload(struct selinux_state *state,
 384                                             int seqno);
 385extern void selinux_complete_init(void);
 386extern int selinux_disable(struct selinux_state *state);
 387extern void exit_sel_fs(void);
 388extern struct path selinux_null;
 389extern struct vfsmount *selinuxfs_mount;
 390extern void selnl_notify_setenforce(int val);
 391extern void selnl_notify_policyload(u32 seqno);
 392extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 393
 394extern void avtab_cache_init(void);
 395extern void ebitmap_cache_init(void);
 396extern void hashtab_cache_init(void);
 397
 398#endif /* _SELINUX_SECURITY_H_ */
 399