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_ */ 281 282