security/selinux/include/security.h

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