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