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
  39 /* Range of policy versions we understand*/
  40 #define POLICYDB_VERSION_MIN   POLICYDB_VERSION_BASE
  41 #ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
  42 #define POLICYDB_VERSION_MAX    CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
  43 #else
  44 #define POLICYDB_VERSION_MAX    POLICYDB_VERSION_CONSTRAINT_NAMES
  45 #endif
  46
  47 /* Mask for just the mount related flags */
  48 #define SE_MNTMASK      0x0f
  49 /* Super block security struct flags for mount options */
  50 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
  51 #define CONTEXT_MNT     0x01
  52 #define FSCONTEXT_MNT   0x02
  53 #define ROOTCONTEXT_MNT 0x04
  54 #define DEFCONTEXT_MNT  0x08
  55 #define SBLABEL_MNT     0x10
  56 /* Non-mount related flags */
  57 #define SE_SBINITIALIZED        0x0100
  58 #define SE_SBPROC               0x0200
  59
  60 #define CONTEXT_STR     "context="
  61 #define FSCONTEXT_STR   "fscontext="
  62 #define ROOTCONTEXT_STR "rootcontext="
  63 #define DEFCONTEXT_STR  "defcontext="
  64 #define LABELSUPP_STR "seclabel"
  65
  66 struct netlbl_lsm_secattr;
  67
  68 extern int selinux_enabled;
  69
  70 /* Policy capabilities */
  71 enum {
  72         POLICYDB_CAPABILITY_NETPEER,
  73         POLICYDB_CAPABILITY_OPENPERM,
  74         POLICYDB_CAPABILITY_REDHAT1,
  75         POLICYDB_CAPABILITY_ALWAYSNETWORK,
  76         __POLICYDB_CAPABILITY_MAX
  77 };
  78 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
  79
  80 extern int selinux_policycap_netpeer;
  81 extern int selinux_policycap_openperm;
  82 extern int selinux_policycap_alwaysnetwork;
  83
  84 /*
  85  * type_datum properties
  86  * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
  87  */
  88 #define TYPEDATUM_PROPERTY_PRIMARY      0x0001
  89 #define TYPEDATUM_PROPERTY_ATTRIBUTE    0x0002
  90
  91 /* limitation of boundary depth  */
  92 #define POLICYDB_BOUNDS_MAXDEPTH        4
  93
  94 int security_mls_enabled(void);
  95
  96 int security_load_policy(void *data, size_t len);
  97 int security_read_policy(void **data, size_t *len);
  98 size_t security_policydb_len(void);
  99
 100 int security_policycap_supported(unsigned int req_cap);
 101
 102 #define SEL_VEC_MAX 32
 103 struct av_decision {
 104         u32 allowed;
 105         u32 auditallow;
 106         u32 auditdeny;
 107         u32 seqno;
 108         u32 flags;
 109 };
 110
 111 /* definitions of av_decision.flags */
 112 #define AVD_FLAGS_PERMISSIVE    0x0001
 113
 114 void security_compute_av(u32 ssid, u32 tsid,
 115                          u16 tclass, struct av_decision *avd);
 116
 117 void security_compute_av_user(u32 ssid, u32 tsid,
 118                              u16 tclass, struct av_decision *avd);
 119
 120 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
 121                             const struct qstr *qstr, u32 *out_sid);
 122
 123 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
 124                                  const char *objname, u32 *out_sid);
 125
 126 int security_member_sid(u32 ssid, u32 tsid,
 127         u16 tclass, u32 *out_sid);
 128
 129 int security_change_sid(u32 ssid, u32 tsid,
 130         u16 tclass, u32 *out_sid);
 131
 132 int security_sid_to_context(u32 sid, char **scontext,
 133         u32 *scontext_len);
 134
 135 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
 136
 137 int security_context_to_sid(const char *scontext, u32 scontext_len,
 138                             u32 *out_sid, gfp_t gfp);
 139
 140 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
 141                                     u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
 142
 143 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
 144                                   u32 *sid);
 145
 146 int security_get_user_sids(u32 callsid, char *username,
 147                            u32 **sids, u32 *nel);
 148
 149 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
 150
 151 int security_netif_sid(char *name, u32 *if_sid);
 152
 153 int security_node_sid(u16 domain, void *addr, u32 addrlen,
 154         u32 *out_sid);
 155
 156 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
 157                                  u16 tclass);
 158
 159 int security_bounded_transition(u32 oldsid, u32 newsid);
 160
 161 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
 162
 163 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
 164                                  u32 xfrm_sid,
 165                                  u32 *peer_sid);
 166
 167 int security_get_classes(char ***classes, int *nclasses);
 168 int security_get_permissions(char *class, char ***perms, int *nperms);
 169 int security_get_reject_unknown(void);
 170 int security_get_allow_unknown(void);
 171
 172 #define SECURITY_FS_USE_XATTR           1 /* use xattr */
 173 #define SECURITY_FS_USE_TRANS           2 /* use transition SIDs, e.g. devpts/tmpfs */
 174 #define SECURITY_FS_USE_TASK            3 /* use task SIDs, e.g. pipefs/sockfs */
 175 #define SECURITY_FS_USE_GENFS           4 /* use the genfs support */
 176 #define SECURITY_FS_USE_NONE            5 /* no labeling support */
 177 #define SECURITY_FS_USE_MNTPOINT        6 /* use mountpoint labeling */
 178 #define SECURITY_FS_USE_NATIVE          7 /* use native label support */
 179 #define SECURITY_FS_USE_MAX             7 /* Highest SECURITY_FS_USE_XXX */
 180
 181 int security_fs_use(struct super_block *sb);
 182
 183 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
 184         u32 *sid);
 185
 186 #ifdef CONFIG_NETLABEL
 187 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
 188                                    u32 *sid);
 189
 190 int security_netlbl_sid_to_secattr(u32 sid,
 191                                    struct netlbl_lsm_secattr *secattr);
 192 #else
 193 static inline int security_netlbl_secattr_to_sid(
 194                                             struct netlbl_lsm_secattr *secattr,
 195                                             u32 *sid)
 196 {
 197         return -EIDRM;
 198 }
 199
 200 static inline int security_netlbl_sid_to_secattr(u32 sid,
 201                                            struct netlbl_lsm_secattr *secattr)
 202 {
 203         return -ENOENT;
 204 }
 205 #endif /* CONFIG_NETLABEL */
 206
 207 const char *security_get_initial_sid_context(u32 sid);
 208
 209 /*
 210  * status notifier using mmap interface
 211  */
 212 extern struct page *selinux_kernel_status_page(void);
 213
 214 #define SELINUX_KERNEL_STATUS_VERSION   1
 215 struct selinux_kernel_status {
 216         u32     version;        /* version number of thie structure */
 217         u32     sequence;       /* sequence number of seqlock logic */
 218         u32     enforcing;      /* current setting of enforcing mode */
 219         u32     policyload;     /* times of policy reloaded */
 220         u32     deny_unknown;   /* current setting of deny_unknown */
 221         /*
 222          * The version > 0 supports above members.
 223          */
 224 } __packed;
 225
 226 extern void selinux_status_update_setenforce(int enforcing);
 227 extern void selinux_status_update_policyload(int seqno);
 228 extern void selinux_complete_init(void);
 229 extern int selinux_disable(void);
 230 extern void exit_sel_fs(void);
 231 extern struct path selinux_null;
 232 extern struct vfsmount *selinuxfs_mount;
 233 extern void selnl_notify_setenforce(int val);
 234 extern void selnl_notify_policyload(u32 seqno);
 235 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 236
 237 #endif /* _SELINUX_SECURITY_H_ */
 238