1 /* 2 * Security server interface. 3 * 4 * Author : Stephen Smalley, <sds@epoch.ncsc.mil> 5 * 6 */ 7 8 #ifndef _SELINUX_SECURITY_H_ 9 #define _SELINUX_SECURITY_H_ 10 11 #include <linux/compiler.h> 12 #include <linux/dcache.h> 13 #include <linux/magic.h> 14 #include <linux/types.h> 15 #include "flask.h" 16 17 #define SECSID_NULL 0x00000000 /* unspecified SID */ 18 #define SECSID_WILD 0xffffffff /* wildcard SID */ 19 #define SECCLASS_NULL 0x0000 /* no class */ 20 21 /* Identify specific policy version changes */ 22 #define POLICYDB_VERSION_BASE 15 23 #define POLICYDB_VERSION_BOOL 16 24 #define POLICYDB_VERSION_IPV6 17 25 #define POLICYDB_VERSION_NLCLASS 18 26 #define POLICYDB_VERSION_VALIDATETRANS 19 27 #define POLICYDB_VERSION_MLS 19 28 #define POLICYDB_VERSION_AVTAB 20 29 #define POLICYDB_VERSION_RANGETRANS 21 30 #define POLICYDB_VERSION_POLCAP 22 31 #define POLICYDB_VERSION_PERMISSIVE 23 32 #define POLICYDB_VERSION_BOUNDARY 24 33 #define POLICYDB_VERSION_FILENAME_TRANS 25 34 #define POLICYDB_VERSION_ROLETRANS 26 35 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27 36 #define POLICYDB_VERSION_DEFAULT_TYPE 28 37 #define POLICYDB_VERSION_CONSTRAINT_NAMES 29 38 #define POLICYDB_VERSION_XPERMS_IOCTL 30 39 40 /* Range of policy versions we understand*/ 41 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE 42 #ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX 43 #define POLICYDB_VERSION_MAX CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE 44 #else 45 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_XPERMS_IOCTL 46 #endif 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_REDHAT1, 77 POLICYDB_CAPABILITY_ALWAYSNETWORK, 78 __POLICYDB_CAPABILITY_MAX 79 }; 80 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1) 81 82 extern int selinux_policycap_netpeer; 83 extern int selinux_policycap_openperm; 84 extern int selinux_policycap_alwaysnetwork; 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 int security_mls_enabled(void); 97 98 int security_load_policy(void *data, size_t len); 99 int security_read_policy(void **data, size_t *len); 100 size_t security_policydb_len(void); 101 102 int security_policycap_supported(unsigned int req_cap); 103 104 #define SEL_VEC_MAX 32 105 struct av_decision { 106 u32 allowed; 107 u32 auditallow; 108 u32 auditdeny; 109 u32 seqno; 110 u32 flags; 111 }; 112 113 #define XPERMS_ALLOWED 1 114 #define XPERMS_AUDITALLOW 2 115 #define XPERMS_DONTAUDIT 4 116 117 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f)) 118 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f))) 119 struct extended_perms_data { 120 u32 p[8]; 121 }; 122 123 struct extended_perms_decision { 124 u8 used; 125 u8 driver; 126 struct extended_perms_data *allowed; 127 struct extended_perms_data *auditallow; 128 struct extended_perms_data *dontaudit; 129 }; 130 131 struct extended_perms { 132 u16 len; /* length associated decision chain */ 133 struct extended_perms_data drivers; /* flag drivers that are used */ 134 }; 135 136 /* definitions of av_decision.flags */ 137 #define AVD_FLAGS_PERMISSIVE 0x0001 138 139 void security_compute_av(u32 ssid, u32 tsid, 140 u16 tclass, struct av_decision *avd, 141 struct extended_perms *xperms); 142 143 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, 144 u8 driver, struct extended_perms_decision *xpermd); 145 146 void security_compute_av_user(u32 ssid, u32 tsid, 147 u16 tclass, struct av_decision *avd); 148 149 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, 150 const struct qstr *qstr, u32 *out_sid); 151 152 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, 153 const char *objname, u32 *out_sid); 154 155 int security_member_sid(u32 ssid, u32 tsid, 156 u16 tclass, u32 *out_sid); 157 158 int security_change_sid(u32 ssid, u32 tsid, 159 u16 tclass, u32 *out_sid); 160 161 int security_sid_to_context(u32 sid, char **scontext, 162 u32 *scontext_len); 163 164 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len); 165 166 int security_context_to_sid(const char *scontext, u32 scontext_len, 167 u32 *out_sid, gfp_t gfp); 168 169 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp); 170 171 int security_context_to_sid_default(const char *scontext, u32 scontext_len, 172 u32 *out_sid, u32 def_sid, gfp_t gfp_flags); 173 174 int security_context_to_sid_force(const char *scontext, u32 scontext_len, 175 u32 *sid); 176 177 int security_get_user_sids(u32 callsid, char *username, 178 u32 **sids, u32 *nel); 179 180 int security_port_sid(u8 protocol, u16 port, u32 *out_sid); 181 182 int security_netif_sid(char *name, u32 *if_sid); 183 184 int security_node_sid(u16 domain, void *addr, u32 addrlen, 185 u32 *out_sid); 186 187 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, 188 u16 tclass); 189 190 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid, 191 u16 tclass); 192 193 int security_bounded_transition(u32 oldsid, u32 newsid); 194 195 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid); 196 197 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, 198 u32 xfrm_sid, 199 u32 *peer_sid); 200 201 int security_get_classes(char ***classes, int *nclasses); 202 int security_get_permissions(char *class, char ***perms, int *nperms); 203 int security_get_reject_unknown(void); 204 int security_get_allow_unknown(void); 205 206 #define SECURITY_FS_USE_XATTR 1 /* use xattr */ 207 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */ 208 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */ 209 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */ 210 #define SECURITY_FS_USE_NONE 5 /* no labeling support */ 211 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */ 212 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */ 213 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */ 214 215 int security_fs_use(struct super_block *sb); 216 217 int security_genfs_sid(const char *fstype, char *name, u16 sclass, 218 u32 *sid); 219 220 #ifdef CONFIG_NETLABEL 221 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, 222 u32 *sid); 223 224 int security_netlbl_sid_to_secattr(u32 sid, 225 struct netlbl_lsm_secattr *secattr); 226 #else 227 static inline int security_netlbl_secattr_to_sid( 228 struct netlbl_lsm_secattr *secattr, 229 u32 *sid) 230 { 231 return -EIDRM; 232 } 233 234 static inline int security_netlbl_sid_to_secattr(u32 sid, 235 struct netlbl_lsm_secattr *secattr) 236 { 237 return -ENOENT; 238 } 239 #endif /* CONFIG_NETLABEL */ 240 241 const char *security_get_initial_sid_context(u32 sid); 242 243 /* 244 * status notifier using mmap interface 245 */ 246 extern struct page *selinux_kernel_status_page(void); 247 248 #define SELINUX_KERNEL_STATUS_VERSION 1 249 struct selinux_kernel_status { 250 u32 version; /* version number of thie structure */ 251 u32 sequence; /* sequence number of seqlock logic */ 252 u32 enforcing; /* current setting of enforcing mode */ 253 u32 policyload; /* times of policy reloaded */ 254 u32 deny_unknown; /* current setting of deny_unknown */ 255 /* 256 * The version > 0 supports above members. 257 */ 258 } __packed; 259 260 extern void selinux_status_update_setenforce(int enforcing); 261 extern void selinux_status_update_policyload(int seqno); 262 extern void selinux_complete_init(void); 263 extern int selinux_disable(void); 264 extern void exit_sel_fs(void); 265 extern struct path selinux_null; 266 extern struct vfsmount *selinuxfs_mount; 267 extern void selnl_notify_setenforce(int val); 268 extern void selnl_notify_policyload(u32 seqno); 269 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); 270 271 #endif /* _SELINUX_SECURITY_H_ */ 272 273