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/dcache.h>
  12 #include <linux/magic.h>
  13 #include <linux/types.h>
  14 #include "flask.h"
  15
  16 #define SECSID_NULL                     0x00000000 /* unspecified SID */
  17 #define SECSID_WILD                     0xffffffff /* wildcard SID */
  18 #define SECCLASS_NULL                   0x0000 /* no class */
  19
  20 /* Identify specific policy version changes */
  21 #define POLICYDB_VERSION_BASE           15
  22 #define POLICYDB_VERSION_BOOL           16
  23 #define POLICYDB_VERSION_IPV6           17
  24 #define POLICYDB_VERSION_NLCLASS        18
  25 #define POLICYDB_VERSION_VALIDATETRANS  19
  26 #define POLICYDB_VERSION_MLS            19
  27 #define POLICYDB_VERSION_AVTAB          20
  28 #define POLICYDB_VERSION_RANGETRANS     21
  29 #define POLICYDB_VERSION_POLCAP         22
  30 #define POLICYDB_VERSION_PERMISSIVE     23
  31 #define POLICYDB_VERSION_BOUNDARY       24
  32 #define POLICYDB_VERSION_FILENAME_TRANS 25
  33 #define POLICYDB_VERSION_ROLETRANS      26
  34 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS    27
  35 #define POLICYDB_VERSION_DEFAULT_TYPE   28
  36
  37 /* Range of policy versions we understand*/
  38 #define POLICYDB_VERSION_MIN   POLICYDB_VERSION_BASE
  39 #ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
  40 #define POLICYDB_VERSION_MAX    CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
  41 #else
  42 #define POLICYDB_VERSION_MAX    POLICYDB_VERSION_DEFAULT_TYPE
  43 #endif
  44
  45 /* Mask for just the mount related flags */
  46 #define SE_MNTMASK      0x0f
  47 /* Super block security struct flags for mount options */
  48 #define CONTEXT_MNT     0x01
  49 #define FSCONTEXT_MNT   0x02
  50 #define ROOTCONTEXT_MNT 0x04
  51 #define DEFCONTEXT_MNT  0x08
  52 /* Non-mount related flags */
  53 #define SE_SBINITIALIZED        0x10
  54 #define SE_SBPROC               0x20
  55 #define SE_SBLABELSUPP  0x40
  56
  57 #define CONTEXT_STR     "context="
  58 #define FSCONTEXT_STR   "fscontext="
  59 #define ROOTCONTEXT_STR "rootcontext="
  60 #define DEFCONTEXT_STR  "defcontext="
  61 #define LABELSUPP_STR "seclabel"
  62
  63 struct netlbl_lsm_secattr;
  64
  65 extern int selinux_enabled;
  66
  67 /* Policy capabilities */
  68 enum {
  69         POLICYDB_CAPABILITY_NETPEER,
  70         POLICYDB_CAPABILITY_OPENPERM,
  71         __POLICYDB_CAPABILITY_MAX
  72 };
  73 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
  74
  75 extern int selinux_policycap_netpeer;
  76 extern int selinux_policycap_openperm;
  77
  78 /*
  79  * type_datum properties
  80  * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
  81  */
  82 #define TYPEDATUM_PROPERTY_PRIMARY      0x0001
  83 #define TYPEDATUM_PROPERTY_ATTRIBUTE    0x0002
  84
  85 /* limitation of boundary depth  */
  86 #define POLICYDB_BOUNDS_MAXDEPTH        4
  87
  88 int security_mls_enabled(void);
  89
  90 int security_load_policy(void *data, size_t len);
  91 int security_read_policy(void **data, size_t *len);
  92 size_t security_policydb_len(void);
  93
  94 int security_policycap_supported(unsigned int req_cap);
  95
  96 #define SEL_VEC_MAX 32
  97 struct av_decision {
  98         u32 allowed;
  99         u32 auditallow;
 100         u32 auditdeny;
 101         u32 seqno;
 102         u32 flags;
 103 };
 104
 105 /* definitions of av_decision.flags */
 106 #define AVD_FLAGS_PERMISSIVE    0x0001
 107
 108 void security_compute_av(u32 ssid, u32 tsid,
 109                          u16 tclass, struct av_decision *avd);
 110
 111 void security_compute_av_user(u32 ssid, u32 tsid,
 112                              u16 tclass, struct av_decision *avd);
 113
 114 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
 115                             const struct qstr *qstr, u32 *out_sid);
 116
 117 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
 118                                  const char *objname, u32 *out_sid);
 119
 120 int security_member_sid(u32 ssid, u32 tsid,
 121         u16 tclass, u32 *out_sid);
 122
 123 int security_change_sid(u32 ssid, u32 tsid,
 124         u16 tclass, u32 *out_sid);
 125
 126 int security_sid_to_context(u32 sid, char **scontext,
 127         u32 *scontext_len);
 128
 129 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
 130
 131 int security_context_to_sid(const char *scontext, u32 scontext_len,
 132         u32 *out_sid);
 133
 134 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
 135                                     u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
 136
 137 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
 138                                   u32 *sid);
 139
 140 int security_get_user_sids(u32 callsid, char *username,
 141                            u32 **sids, u32 *nel);
 142
 143 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
 144
 145 int security_netif_sid(char *name, u32 *if_sid);
 146
 147 int security_node_sid(u16 domain, void *addr, u32 addrlen,
 148         u32 *out_sid);
 149
 150 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
 151                                  u16 tclass);
 152
 153 int security_bounded_transition(u32 oldsid, u32 newsid);
 154
 155 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
 156
 157 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
 158                                  u32 xfrm_sid,
 159                                  u32 *peer_sid);
 160
 161 int security_get_classes(char ***classes, int *nclasses);
 162 int security_get_permissions(char *class, char ***perms, int *nperms);
 163 int security_get_reject_unknown(void);
 164 int security_get_allow_unknown(void);
 165
 166 #define SECURITY_FS_USE_XATTR           1 /* use xattr */
 167 #define SECURITY_FS_USE_TRANS           2 /* use transition SIDs, e.g. devpts/tmpfs */
 168 #define SECURITY_FS_USE_TASK            3 /* use task SIDs, e.g. pipefs/sockfs */
 169 #define SECURITY_FS_USE_GENFS           4 /* use the genfs support */
 170 #define SECURITY_FS_USE_NONE            5 /* no labeling support */
 171 #define SECURITY_FS_USE_MNTPOINT        6 /* use mountpoint labeling */
 172
 173 int security_fs_use(const char *fstype, unsigned int *behavior,
 174         u32 *sid);
 175
 176 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
 177         u32 *sid);
 178
 179 #ifdef CONFIG_NETLABEL
 180 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
 181                                    u32 *sid);
 182
 183 int security_netlbl_sid_to_secattr(u32 sid,
 184                                    struct netlbl_lsm_secattr *secattr);
 185 #else
 186 static inline int security_netlbl_secattr_to_sid(
 187                                             struct netlbl_lsm_secattr *secattr,
 188                                             u32 *sid)
 189 {
 190         return -EIDRM;
 191 }
 192
 193 static inline int security_netlbl_sid_to_secattr(u32 sid,
 194                                            struct netlbl_lsm_secattr *secattr)
 195 {
 196         return -ENOENT;
 197 }
 198 #endif /* CONFIG_NETLABEL */
 199
 200 const char *security_get_initial_sid_context(u32 sid);
 201
 202 /*
 203  * status notifier using mmap interface
 204  */
 205 extern struct page *selinux_kernel_status_page(void);
 206
 207 #define SELINUX_KERNEL_STATUS_VERSION   1
 208 struct selinux_kernel_status {
 209         u32     version;        /* version number of thie structure */
 210         u32     sequence;       /* sequence number of seqlock logic */
 211         u32     enforcing;      /* current setting of enforcing mode */
 212         u32     policyload;     /* times of policy reloaded */
 213         u32     deny_unknown;   /* current setting of deny_unknown */
 214         /*
 215          * The version > 0 supports above members.
 216          */
 217 } __attribute__((packed));
 218
 219 extern void selinux_status_update_setenforce(int enforcing);
 220 extern void selinux_status_update_policyload(int seqno);
 221 extern void selinux_complete_init(void);
 222 extern int selinux_disable(void);
 223 extern void exit_sel_fs(void);
 224 extern struct path selinux_null;
 225 extern struct vfsmount *selinuxfs_mount;
 226 extern void selnl_notify_setenforce(int val);
 227 extern void selnl_notify_policyload(u32 seqno);
 228 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 229
 230 #endif /* _SELINUX_SECURITY_H_ */
 231