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 #define POLICYDB_VERSION_XPERMS_IOCTL   30
  39
  40 /* Range of policy versions we understand*/
  41 #define POLICYDB_VERSION_MIN   POLICYDB_VERSION_BASE
  42 #define POLICYDB_VERSION_MAX    POLICYDB_VERSION_XPERMS_IOCTL
  43
  44 /* Mask for just the mount related flags */
  45 #define SE_MNTMASK      0x0f
  46 /* Super block security struct flags for mount options */
  47 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
  48 #define CONTEXT_MNT     0x01
  49 #define FSCONTEXT_MNT   0x02
  50 #define ROOTCONTEXT_MNT 0x04
  51 #define DEFCONTEXT_MNT  0x08
  52 #define SBLABEL_MNT     0x10
  53 /* Non-mount related flags */
  54 #define SE_SBINITIALIZED        0x0100
  55 #define SE_SBPROC               0x0200
  56 #define SE_SBGENFS              0x0400
  57
  58 #define CONTEXT_STR     "context="
  59 #define FSCONTEXT_STR   "fscontext="
  60 #define ROOTCONTEXT_STR "rootcontext="
  61 #define DEFCONTEXT_STR  "defcontext="
  62 #define LABELSUPP_STR "seclabel"
  63
  64 struct netlbl_lsm_secattr;
  65
  66 extern int selinux_enabled;
  67
  68 /* Policy capabilities */
  69 enum {
  70         POLICYDB_CAPABILITY_NETPEER,
  71         POLICYDB_CAPABILITY_OPENPERM,
  72         POLICYDB_CAPABILITY_EXTSOCKCLASS,
  73         POLICYDB_CAPABILITY_ALWAYSNETWORK,
  74         __POLICYDB_CAPABILITY_MAX
  75 };
  76 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
  77
  78 extern int selinux_policycap_netpeer;
  79 extern int selinux_policycap_openperm;
  80 extern int selinux_policycap_extsockclass;
  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 #define XPERMS_ALLOWED 1
 111 #define XPERMS_AUDITALLOW 2
 112 #define XPERMS_DONTAUDIT 4
 113
 114 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
 115 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
 116 struct extended_perms_data {
 117         u32 p[8];
 118 };
 119
 120 struct extended_perms_decision {
 121         u8 used;
 122         u8 driver;
 123         struct extended_perms_data *allowed;
 124         struct extended_perms_data *auditallow;
 125         struct extended_perms_data *dontaudit;
 126 };
 127
 128 struct extended_perms {
 129         u16 len;        /* length associated decision chain */
 130         struct extended_perms_data drivers; /* flag drivers that are used */
 131 };
 132
 133 /* definitions of av_decision.flags */
 134 #define AVD_FLAGS_PERMISSIVE    0x0001
 135
 136 void security_compute_av(u32 ssid, u32 tsid,
 137                          u16 tclass, struct av_decision *avd,
 138                          struct extended_perms *xperms);
 139
 140 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass,
 141                          u8 driver, struct extended_perms_decision *xpermd);
 142
 143 void security_compute_av_user(u32 ssid, u32 tsid,
 144                              u16 tclass, struct av_decision *avd);
 145
 146 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
 147                             const struct qstr *qstr, u32 *out_sid);
 148
 149 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
 150                                  const char *objname, u32 *out_sid);
 151
 152 int security_member_sid(u32 ssid, u32 tsid,
 153         u16 tclass, u32 *out_sid);
 154
 155 int security_change_sid(u32 ssid, u32 tsid,
 156         u16 tclass, u32 *out_sid);
 157
 158 int security_sid_to_context(u32 sid, char **scontext,
 159         u32 *scontext_len);
 160
 161 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
 162
 163 int security_context_to_sid(const char *scontext, u32 scontext_len,
 164                             u32 *out_sid, gfp_t gfp);
 165
 166 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
 167
 168 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
 169                                     u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
 170
 171 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
 172                                   u32 *sid);
 173
 174 int security_get_user_sids(u32 callsid, char *username,
 175                            u32 **sids, u32 *nel);
 176
 177 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
 178
 179 int security_netif_sid(char *name, u32 *if_sid);
 180
 181 int security_node_sid(u16 domain, void *addr, u32 addrlen,
 182         u32 *out_sid);
 183
 184 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
 185                                  u16 tclass);
 186
 187 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
 188                                       u16 tclass);
 189
 190 int security_bounded_transition(u32 oldsid, u32 newsid);
 191
 192 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
 193
 194 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
 195                                  u32 xfrm_sid,
 196                                  u32 *peer_sid);
 197
 198 int security_get_classes(char ***classes, int *nclasses);
 199 int security_get_permissions(char *class, char ***perms, int *nperms);
 200 int security_get_reject_unknown(void);
 201 int security_get_allow_unknown(void);
 202
 203 #define SECURITY_FS_USE_XATTR           1 /* use xattr */
 204 #define SECURITY_FS_USE_TRANS           2 /* use transition SIDs, e.g. devpts/tmpfs */
 205 #define SECURITY_FS_USE_TASK            3 /* use task SIDs, e.g. pipefs/sockfs */
 206 #define SECURITY_FS_USE_GENFS           4 /* use the genfs support */
 207 #define SECURITY_FS_USE_NONE            5 /* no labeling support */
 208 #define SECURITY_FS_USE_MNTPOINT        6 /* use mountpoint labeling */
 209 #define SECURITY_FS_USE_NATIVE          7 /* use native label support */
 210 #define SECURITY_FS_USE_MAX             7 /* Highest SECURITY_FS_USE_XXX */
 211
 212 int security_fs_use(struct super_block *sb);
 213
 214 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
 215         u32 *sid);
 216
 217 #ifdef CONFIG_NETLABEL
 218 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
 219                                    u32 *sid);
 220
 221 int security_netlbl_sid_to_secattr(u32 sid,
 222                                    struct netlbl_lsm_secattr *secattr);
 223 #else
 224 static inline int security_netlbl_secattr_to_sid(
 225                                             struct netlbl_lsm_secattr *secattr,
 226                                             u32 *sid)
 227 {
 228         return -EIDRM;
 229 }
 230
 231 static inline int security_netlbl_sid_to_secattr(u32 sid,
 232                                            struct netlbl_lsm_secattr *secattr)
 233 {
 234         return -ENOENT;
 235 }
 236 #endif /* CONFIG_NETLABEL */
 237
 238 const char *security_get_initial_sid_context(u32 sid);
 239
 240 /*
 241  * status notifier using mmap interface
 242  */
 243 extern struct page *selinux_kernel_status_page(void);
 244
 245 #define SELINUX_KERNEL_STATUS_VERSION   1
 246 struct selinux_kernel_status {
 247         u32     version;        /* version number of thie structure */
 248         u32     sequence;       /* sequence number of seqlock logic */
 249         u32     enforcing;      /* current setting of enforcing mode */
 250         u32     policyload;     /* times of policy reloaded */
 251         u32     deny_unknown;   /* current setting of deny_unknown */
 252         /*
 253          * The version > 0 supports above members.
 254          */
 255 } __packed;
 256
 257 extern void selinux_status_update_setenforce(int enforcing);
 258 extern void selinux_status_update_policyload(int seqno);
 259 extern void selinux_complete_init(void);
 260 extern int selinux_disable(void);
 261 extern void exit_sel_fs(void);
 262 extern struct path selinux_null;
 263 extern struct vfsmount *selinuxfs_mount;
 264 extern void selnl_notify_setenforce(int val);
 265 extern void selnl_notify_policyload(u32 seqno);
 266 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 267
 268 #endif /* _SELINUX_SECURITY_H_ */
 269