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 #define POLICYDB_VERSION_XPERMS_IOCTL   30
  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_XPERMS_IOCTL
  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 #define CONTEXT_MNT     0x01
  51 #define FSCONTEXT_MNT   0x02
  52 #define ROOTCONTEXT_MNT 0x04
  53 #define DEFCONTEXT_MNT  0x08
  54 /* Non-mount related flags */
  55 #define SE_SBINITIALIZED        0x10
  56 #define SE_SBPROC               0x20
  57 #define SE_SBLABELSUPP  0x40
  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_MAX
  74 };
  75 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
  76
  77 extern int selinux_policycap_netpeer;
  78 extern int selinux_policycap_openperm;
  79
  80 /*
  81  * type_datum properties
  82  * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
  83  */
  84 #define TYPEDATUM_PROPERTY_PRIMARY      0x0001
  85 #define TYPEDATUM_PROPERTY_ATTRIBUTE    0x0002
  86
  87 /* limitation of boundary depth  */
  88 #define POLICYDB_BOUNDS_MAXDEPTH        4
  89
  90 int security_mls_enabled(void);
  91
  92 int security_load_policy(void *data, size_t len);
  93 int security_read_policy(void **data, size_t *len);
  94 size_t security_policydb_len(void);
  95
  96 int security_policycap_supported(unsigned int req_cap);
  97
  98 #define SEL_VEC_MAX 32
  99 struct av_decision {
 100         u32 allowed;
 101         u32 auditallow;
 102         u32 auditdeny;
 103         u32 seqno;
 104         u32 flags;
 105 };
 106
 107 #define XPERMS_ALLOWED 1
 108 #define XPERMS_AUDITALLOW 2
 109 #define XPERMS_DONTAUDIT 4
 110
 111 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
 112 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
 113 struct extended_perms_data {
 114         u32 p[8];
 115 };
 116
 117 struct extended_perms_decision {
 118         u8 used;
 119         u8 driver;
 120         struct extended_perms_data *allowed;
 121         struct extended_perms_data *auditallow;
 122         struct extended_perms_data *dontaudit;
 123 };
 124
 125 struct extended_perms {
 126         u16 len;        /* length associated decision chain */
 127         struct extended_perms_data drivers; /* flag drivers that are used */
 128 };
 129
 130 /* definitions of av_decision.flags */
 131 #define AVD_FLAGS_PERMISSIVE    0x0001
 132
 133 void security_compute_av(u32 ssid, u32 tsid,
 134                          u16 tclass, struct av_decision *avd,
 135                          struct extended_perms *xperms);
 136
 137 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass,
 138                          u8 driver, struct extended_perms_decision *xpermd);
 139
 140 void security_compute_av_user(u32 ssid, u32 tsid,
 141                              u16 tclass, struct av_decision *avd);
 142
 143 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
 144                             const struct qstr *qstr, u32 *out_sid);
 145
 146 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
 147                                  const char *objname, u32 *out_sid);
 148
 149 int security_member_sid(u32 ssid, u32 tsid,
 150         u16 tclass, u32 *out_sid);
 151
 152 int security_change_sid(u32 ssid, u32 tsid,
 153         u16 tclass, u32 *out_sid);
 154
 155 int security_sid_to_context(u32 sid, char **scontext,
 156         u32 *scontext_len);
 157
 158 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
 159
 160 int security_context_to_sid(const char *scontext, u32 scontext_len,
 161         u32 *out_sid);
 162
 163 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
 164                                     u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
 165
 166 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
 167                                   u32 *sid);
 168
 169 int security_get_user_sids(u32 callsid, char *username,
 170                            u32 **sids, u32 *nel);
 171
 172 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
 173
 174 int security_netif_sid(char *name, u32 *if_sid);
 175
 176 int security_node_sid(u16 domain, void *addr, u32 addrlen,
 177         u32 *out_sid);
 178
 179 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
 180                                  u16 tclass);
 181
 182 int security_bounded_transition(u32 oldsid, u32 newsid);
 183
 184 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
 185
 186 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
 187                                  u32 xfrm_sid,
 188                                  u32 *peer_sid);
 189
 190 int security_get_classes(char ***classes, int *nclasses);
 191 int security_get_permissions(char *class, char ***perms, int *nperms);
 192 int security_get_reject_unknown(void);
 193 int security_get_allow_unknown(void);
 194
 195 #define SECURITY_FS_USE_XATTR           1 /* use xattr */
 196 #define SECURITY_FS_USE_TRANS           2 /* use transition SIDs, e.g. devpts/tmpfs */
 197 #define SECURITY_FS_USE_TASK            3 /* use task SIDs, e.g. pipefs/sockfs */
 198 #define SECURITY_FS_USE_GENFS           4 /* use the genfs support */
 199 #define SECURITY_FS_USE_NONE            5 /* no labeling support */
 200 #define SECURITY_FS_USE_MNTPOINT        6 /* use mountpoint labeling */
 201
 202 int security_fs_use(const char *fstype, unsigned int *behavior,
 203         u32 *sid);
 204
 205 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
 206         u32 *sid);
 207
 208 #ifdef CONFIG_NETLABEL
 209 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
 210                                    u32 *sid);
 211
 212 int security_netlbl_sid_to_secattr(u32 sid,
 213                                    struct netlbl_lsm_secattr *secattr);
 214 #else
 215 static inline int security_netlbl_secattr_to_sid(
 216                                             struct netlbl_lsm_secattr *secattr,
 217                                             u32 *sid)
 218 {
 219         return -EIDRM;
 220 }
 221
 222 static inline int security_netlbl_sid_to_secattr(u32 sid,
 223                                            struct netlbl_lsm_secattr *secattr)
 224 {
 225         return -ENOENT;
 226 }
 227 #endif /* CONFIG_NETLABEL */
 228
 229 const char *security_get_initial_sid_context(u32 sid);
 230
 231 /*
 232  * status notifier using mmap interface
 233  */
 234 extern struct page *selinux_kernel_status_page(void);
 235
 236 #define SELINUX_KERNEL_STATUS_VERSION   1
 237 struct selinux_kernel_status {
 238         u32     version;        /* version number of thie structure */
 239         u32     sequence;       /* sequence number of seqlock logic */
 240         u32     enforcing;      /* current setting of enforcing mode */
 241         u32     policyload;     /* times of policy reloaded */
 242         u32     deny_unknown;   /* current setting of deny_unknown */
 243         /*
 244          * The version > 0 supports above members.
 245          */
 246 } __attribute__((packed));
 247
 248 extern void selinux_status_update_setenforce(int enforcing);
 249 extern void selinux_status_update_policyload(int seqno);
 250 extern void selinux_complete_init(void);
 251 extern int selinux_disable(void);
 252 extern void exit_sel_fs(void);
 253 extern struct path selinux_null;
 254 extern struct vfsmount *selinuxfs_mount;
 255 extern void selnl_notify_setenforce(int val);
 256 extern void selnl_notify_policyload(u32 seqno);
 257 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 258
 259 #endif /* _SELINUX_SECURITY_H_ */
 260