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