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 #define POLICYDB_VERSION_CONSTRAINT_NAMES       29
  37
  38 /* Range of policy versions we understand*/
  39 #define POLICYDB_VERSION_MIN   POLICYDB_VERSION_BASE
  40 #ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
  41 #define POLICYDB_VERSION_MAX    CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
  42 #else
  43 #define POLICYDB_VERSION_MAX    POLICYDB_VERSION_CONSTRAINT_NAMES
  44 #endif
  45
  46 /* Mask for just the mount related flags */
  47 #define SE_MNTMASK      0x0f
  48 /* Super block security struct flags for mount options */
  49 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
  50 #define CONTEXT_MNT     0x01
  51 #define FSCONTEXT_MNT   0x02
  52 #define ROOTCONTEXT_MNT 0x04
  53 #define DEFCONTEXT_MNT  0x08
  54 #define SBLABEL_MNT     0x10
  55 /* Non-mount related flags */
  56 #define SE_SBINITIALIZED        0x0100
  57 #define SE_SBPROC               0x0200
  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_REDHAT1,
  74         POLICYDB_CAPABILITY_ALWAYSNETWORK,
  75         __POLICYDB_CAPABILITY_MAX
  76 };
  77 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
  78
  79 extern int selinux_policycap_netpeer;
  80 extern int selinux_policycap_openperm;
  81 extern int selinux_policycap_alwaysnetwork;
  82
  83 /*
  84  * type_datum properties
  85  * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
  86  */
  87 #define TYPEDATUM_PROPERTY_PRIMARY      0x0001
  88 #define TYPEDATUM_PROPERTY_ATTRIBUTE    0x0002
  89
  90 /* limitation of boundary depth  */
  91 #define POLICYDB_BOUNDS_MAXDEPTH        4
  92
  93 int security_mls_enabled(void);
  94
  95 int security_load_policy(void *data, size_t len);
  96 int security_read_policy(void **data, size_t *len);
  97 size_t security_policydb_len(void);
  98
  99 int security_policycap_supported(unsigned int req_cap);
 100
 101 #define SEL_VEC_MAX 32
 102 struct av_decision {
 103         u32 allowed;
 104         u32 auditallow;
 105         u32 auditdeny;
 106         u32 seqno;
 107         u32 flags;
 108 };
 109
 110 /* definitions of av_decision.flags */
 111 #define AVD_FLAGS_PERMISSIVE    0x0001
 112
 113 void security_compute_av(u32 ssid, u32 tsid,
 114                          u16 tclass, struct av_decision *avd);
 115
 116 void security_compute_av_user(u32 ssid, u32 tsid,
 117                              u16 tclass, struct av_decision *avd);
 118
 119 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
 120                             const struct qstr *qstr, u32 *out_sid);
 121
 122 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
 123                                  const char *objname, u32 *out_sid);
 124
 125 int security_member_sid(u32 ssid, u32 tsid,
 126         u16 tclass, u32 *out_sid);
 127
 128 int security_change_sid(u32 ssid, u32 tsid,
 129         u16 tclass, u32 *out_sid);
 130
 131 int security_sid_to_context(u32 sid, char **scontext,
 132         u32 *scontext_len);
 133
 134 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
 135
 136 int security_context_to_sid(const char *scontext, u32 scontext_len,
 137                             u32 *out_sid, gfp_t gfp);
 138
 139 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
 140                                     u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
 141
 142 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
 143                                   u32 *sid);
 144
 145 int security_get_user_sids(u32 callsid, char *username,
 146                            u32 **sids, u32 *nel);
 147
 148 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
 149
 150 int security_netif_sid(char *name, u32 *if_sid);
 151
 152 int security_node_sid(u16 domain, void *addr, u32 addrlen,
 153         u32 *out_sid);
 154
 155 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
 156                                  u16 tclass);
 157
 158 int security_bounded_transition(u32 oldsid, u32 newsid);
 159
 160 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
 161
 162 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
 163                                  u32 xfrm_sid,
 164                                  u32 *peer_sid);
 165
 166 int security_get_classes(char ***classes, int *nclasses);
 167 int security_get_permissions(char *class, char ***perms, int *nperms);
 168 int security_get_reject_unknown(void);
 169 int security_get_allow_unknown(void);
 170
 171 #define SECURITY_FS_USE_XATTR           1 /* use xattr */
 172 #define SECURITY_FS_USE_TRANS           2 /* use transition SIDs, e.g. devpts/tmpfs */
 173 #define SECURITY_FS_USE_TASK            3 /* use task SIDs, e.g. pipefs/sockfs */
 174 #define SECURITY_FS_USE_GENFS           4 /* use the genfs support */
 175 #define SECURITY_FS_USE_NONE            5 /* no labeling support */
 176 #define SECURITY_FS_USE_MNTPOINT        6 /* use mountpoint labeling */
 177 #define SECURITY_FS_USE_NATIVE          7 /* use native label support */
 178 #define SECURITY_FS_USE_MAX             7 /* Highest SECURITY_FS_USE_XXX */
 179
 180 int security_fs_use(struct super_block *sb);
 181
 182 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
 183         u32 *sid);
 184
 185 #ifdef CONFIG_NETLABEL
 186 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
 187                                    u32 *sid);
 188
 189 int security_netlbl_sid_to_secattr(u32 sid,
 190                                    struct netlbl_lsm_secattr *secattr);
 191 #else
 192 static inline int security_netlbl_secattr_to_sid(
 193                                             struct netlbl_lsm_secattr *secattr,
 194                                             u32 *sid)
 195 {
 196         return -EIDRM;
 197 }
 198
 199 static inline int security_netlbl_sid_to_secattr(u32 sid,
 200                                            struct netlbl_lsm_secattr *secattr)
 201 {
 202         return -ENOENT;
 203 }
 204 #endif /* CONFIG_NETLABEL */
 205
 206 const char *security_get_initial_sid_context(u32 sid);
 207
 208 /*
 209  * status notifier using mmap interface
 210  */
 211 extern struct page *selinux_kernel_status_page(void);
 212
 213 #define SELINUX_KERNEL_STATUS_VERSION   1
 214 struct selinux_kernel_status {
 215         u32     version;        /* version number of thie structure */
 216         u32     sequence;       /* sequence number of seqlock logic */
 217         u32     enforcing;      /* current setting of enforcing mode */
 218         u32     policyload;     /* times of policy reloaded */
 219         u32     deny_unknown;   /* current setting of deny_unknown */
 220         /*
 221          * The version > 0 supports above members.
 222          */
 223 } __attribute__((packed));
 224
 225 extern void selinux_status_update_setenforce(int enforcing);
 226 extern void selinux_status_update_policyload(int seqno);
 227 extern void selinux_complete_init(void);
 228 extern int selinux_disable(void);
 229 extern void exit_sel_fs(void);
 230 extern struct path selinux_null;
 231 extern struct vfsmount *selinuxfs_mount;
 232 extern void selnl_notify_setenforce(int val);
 233 extern void selnl_notify_policyload(u32 seqno);
 234 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 235
 236 #endif /* _SELINUX_SECURITY_H_ */
 237