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 "flask.h"
  17
  18 #define SECSID_NULL                     0x00000000 /* unspecified SID */
  19 #define SECSID_WILD                     0xffffffff /* wildcard SID */
  20 #define SECCLASS_NULL                   0x0000 /* no class */
  21
  22 /* Identify specific policy version changes */
  23 #define POLICYDB_VERSION_BASE           15
  24 #define POLICYDB_VERSION_BOOL           16
  25 #define POLICYDB_VERSION_IPV6           17
  26 #define POLICYDB_VERSION_NLCLASS        18
  27 #define POLICYDB_VERSION_VALIDATETRANS  19
  28 #define POLICYDB_VERSION_MLS            19
  29 #define POLICYDB_VERSION_AVTAB          20
  30 #define POLICYDB_VERSION_RANGETRANS     21
  31 #define POLICYDB_VERSION_POLCAP         22
  32 #define POLICYDB_VERSION_PERMISSIVE     23
  33 #define POLICYDB_VERSION_BOUNDARY       24
  34 #define POLICYDB_VERSION_FILENAME_TRANS 25
  35 #define POLICYDB_VERSION_ROLETRANS      26
  36 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS    27
  37 #define POLICYDB_VERSION_DEFAULT_TYPE   28
  38 #define POLICYDB_VERSION_CONSTRAINT_NAMES       29
  39 #define POLICYDB_VERSION_XPERMS_IOCTL   30
  40 #define POLICYDB_VERSION_INFINIBAND             31
  41
  42 /* Range of policy versions we understand*/
  43 #define POLICYDB_VERSION_MIN   POLICYDB_VERSION_BASE
  44 #define POLICYDB_VERSION_MAX   POLICYDB_VERSION_INFINIBAND
  45
  46 /* Mask for just the mount related flags */
  47 #define SE_MNTMASK      0x0f
  48 /* Super block security struct flags for mount options */
  49 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
  50 #define CONTEXT_MNT     0x01
  51 #define FSCONTEXT_MNT   0x02
  52 #define ROOTCONTEXT_MNT 0x04
  53 #define DEFCONTEXT_MNT  0x08
  54 #define SBLABEL_MNT     0x10
  55 /* Non-mount related flags */
  56 #define SE_SBINITIALIZED        0x0100
  57 #define SE_SBPROC               0x0200
  58 #define SE_SBGENFS              0x0400
  59
  60 #define CONTEXT_STR     "context="
  61 #define FSCONTEXT_STR   "fscontext="
  62 #define ROOTCONTEXT_STR "rootcontext="
  63 #define DEFCONTEXT_STR  "defcontext="
  64 #define LABELSUPP_STR "seclabel"
  65
  66 struct netlbl_lsm_secattr;
  67
  68 extern int selinux_enabled;
  69
  70 /* Policy capabilities */
  71 enum {
  72         POLICYDB_CAPABILITY_NETPEER,
  73         POLICYDB_CAPABILITY_OPENPERM,
  74         POLICYDB_CAPABILITY_EXTSOCKCLASS,
  75         POLICYDB_CAPABILITY_ALWAYSNETWORK,
  76         POLICYDB_CAPABILITY_CGROUPSECLABEL,
  77         POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION,
  78         __POLICYDB_CAPABILITY_MAX
  79 };
  80 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
  81
  82 extern char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX];
  83
  84 extern int selinux_policycap_netpeer;
  85 extern int selinux_policycap_openperm;
  86 extern int selinux_policycap_extsockclass;
  87 extern int selinux_policycap_alwaysnetwork;
  88 extern int selinux_policycap_cgroupseclabel;
  89 extern int selinux_policycap_nnp_nosuid_transition;
  90
  91 /*
  92  * type_datum properties
  93  * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
  94  */
  95 #define TYPEDATUM_PROPERTY_PRIMARY      0x0001
  96 #define TYPEDATUM_PROPERTY_ATTRIBUTE    0x0002
  97
  98 /* limitation of boundary depth  */
  99 #define POLICYDB_BOUNDS_MAXDEPTH        4
 100
 101 int security_mls_enabled(void);
 102
 103 int security_load_policy(void *data, size_t len);
 104 int security_read_policy(void **data, size_t *len);
 105 size_t security_policydb_len(void);
 106
 107 int security_policycap_supported(unsigned int req_cap);
 108
 109 #define SEL_VEC_MAX 32
 110 struct av_decision {
 111         u32 allowed;
 112         u32 auditallow;
 113         u32 auditdeny;
 114         u32 seqno;
 115         u32 flags;
 116 };
 117
 118 #define XPERMS_ALLOWED 1
 119 #define XPERMS_AUDITALLOW 2
 120 #define XPERMS_DONTAUDIT 4
 121
 122 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
 123 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
 124 struct extended_perms_data {
 125         u32 p[8];
 126 };
 127
 128 struct extended_perms_decision {
 129         u8 used;
 130         u8 driver;
 131         struct extended_perms_data *allowed;
 132         struct extended_perms_data *auditallow;
 133         struct extended_perms_data *dontaudit;
 134 };
 135
 136 struct extended_perms {
 137         u16 len;        /* length associated decision chain */
 138         struct extended_perms_data drivers; /* flag drivers that are used */
 139 };
 140
 141 /* definitions of av_decision.flags */
 142 #define AVD_FLAGS_PERMISSIVE    0x0001
 143
 144 void security_compute_av(u32 ssid, u32 tsid,
 145                          u16 tclass, struct av_decision *avd,
 146                          struct extended_perms *xperms);
 147
 148 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass,
 149                          u8 driver, struct extended_perms_decision *xpermd);
 150
 151 void security_compute_av_user(u32 ssid, u32 tsid,
 152                              u16 tclass, struct av_decision *avd);
 153
 154 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
 155                             const struct qstr *qstr, u32 *out_sid);
 156
 157 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
 158                                  const char *objname, u32 *out_sid);
 159
 160 int security_member_sid(u32 ssid, u32 tsid,
 161         u16 tclass, u32 *out_sid);
 162
 163 int security_change_sid(u32 ssid, u32 tsid,
 164         u16 tclass, u32 *out_sid);
 165
 166 int security_sid_to_context(u32 sid, char **scontext,
 167         u32 *scontext_len);
 168
 169 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
 170
 171 int security_context_to_sid(const char *scontext, u32 scontext_len,
 172                             u32 *out_sid, gfp_t gfp);
 173
 174 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
 175
 176 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
 177                                     u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
 178
 179 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
 180                                   u32 *sid);
 181
 182 int security_get_user_sids(u32 callsid, char *username,
 183                            u32 **sids, u32 *nel);
 184
 185 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
 186
 187 int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
 188
 189 int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
 190
 191 int security_netif_sid(char *name, u32 *if_sid);
 192
 193 int security_node_sid(u16 domain, void *addr, u32 addrlen,
 194         u32 *out_sid);
 195
 196 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
 197                                  u16 tclass);
 198
 199 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
 200                                       u16 tclass);
 201
 202 int security_bounded_transition(u32 oldsid, u32 newsid);
 203
 204 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
 205
 206 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
 207                                  u32 xfrm_sid,
 208                                  u32 *peer_sid);
 209
 210 int security_get_classes(char ***classes, int *nclasses);
 211 int security_get_permissions(char *class, char ***perms, int *nperms);
 212 int security_get_reject_unknown(void);
 213 int security_get_allow_unknown(void);
 214
 215 #define SECURITY_FS_USE_XATTR           1 /* use xattr */
 216 #define SECURITY_FS_USE_TRANS           2 /* use transition SIDs, e.g. devpts/tmpfs */
 217 #define SECURITY_FS_USE_TASK            3 /* use task SIDs, e.g. pipefs/sockfs */
 218 #define SECURITY_FS_USE_GENFS           4 /* use the genfs support */
 219 #define SECURITY_FS_USE_NONE            5 /* no labeling support */
 220 #define SECURITY_FS_USE_MNTPOINT        6 /* use mountpoint labeling */
 221 #define SECURITY_FS_USE_NATIVE          7 /* use native label support */
 222 #define SECURITY_FS_USE_MAX             7 /* Highest SECURITY_FS_USE_XXX */
 223
 224 int security_fs_use(struct super_block *sb);
 225
 226 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
 227         u32 *sid);
 228
 229 #ifdef CONFIG_NETLABEL
 230 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
 231                                    u32 *sid);
 232
 233 int security_netlbl_sid_to_secattr(u32 sid,
 234                                    struct netlbl_lsm_secattr *secattr);
 235 #else
 236 static inline int security_netlbl_secattr_to_sid(
 237                                             struct netlbl_lsm_secattr *secattr,
 238                                             u32 *sid)
 239 {
 240         return -EIDRM;
 241 }
 242
 243 static inline int security_netlbl_sid_to_secattr(u32 sid,
 244                                            struct netlbl_lsm_secattr *secattr)
 245 {
 246         return -ENOENT;
 247 }
 248 #endif /* CONFIG_NETLABEL */
 249
 250 const char *security_get_initial_sid_context(u32 sid);
 251
 252 /*
 253  * status notifier using mmap interface
 254  */
 255 extern struct page *selinux_kernel_status_page(void);
 256
 257 #define SELINUX_KERNEL_STATUS_VERSION   1
 258 struct selinux_kernel_status {
 259         u32     version;        /* version number of thie structure */
 260         u32     sequence;       /* sequence number of seqlock logic */
 261         u32     enforcing;      /* current setting of enforcing mode */
 262         u32     policyload;     /* times of policy reloaded */
 263         u32     deny_unknown;   /* current setting of deny_unknown */
 264         /*
 265          * The version > 0 supports above members.
 266          */
 267 } __packed;
 268
 269 extern void selinux_status_update_setenforce(int enforcing);
 270 extern void selinux_status_update_policyload(int seqno);
 271 extern void selinux_complete_init(void);
 272 extern int selinux_disable(void);
 273 extern void exit_sel_fs(void);
 274 extern struct path selinux_null;
 275 extern struct vfsmount *selinuxfs_mount;
 276 extern void selnl_notify_setenforce(int val);
 277 extern void selnl_notify_policyload(u32 seqno);
 278 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 279
 280 #endif /* _SELINUX_SECURITY_H_ */
 281