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 #ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
  43 #define POLICYDB_VERSION_MAX    CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
  44 #else
  45 #define POLICYDB_VERSION_MAX    POLICYDB_VERSION_XPERMS_IOCTL
  46 #endif
  47
  48 /* Mask for just the mount related flags */
  49 #define SE_MNTMASK      0x0f
  50 /* Super block security struct flags for mount options */
  51 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
  52 #define CONTEXT_MNT     0x01
  53 #define FSCONTEXT_MNT   0x02
  54 #define ROOTCONTEXT_MNT 0x04
  55 #define DEFCONTEXT_MNT  0x08
  56 #define SBLABEL_MNT     0x10
  57 /* Non-mount related flags */
  58 #define SE_SBINITIALIZED        0x0100
  59 #define SE_SBPROC               0x0200
  60 #define SE_SBGENFS              0x0400
  61
  62 #define CONTEXT_STR     "context="
  63 #define FSCONTEXT_STR   "fscontext="
  64 #define ROOTCONTEXT_STR "rootcontext="
  65 #define DEFCONTEXT_STR  "defcontext="
  66 #define LABELSUPP_STR "seclabel"
  67
  68 struct netlbl_lsm_secattr;
  69
  70 extern int selinux_enabled;
  71
  72 /* Policy capabilities */
  73 enum {
  74         POLICYDB_CAPABILITY_NETPEER,
  75         POLICYDB_CAPABILITY_OPENPERM,
  76         POLICYDB_CAPABILITY_REDHAT1,
  77         POLICYDB_CAPABILITY_ALWAYSNETWORK,
  78         __POLICYDB_CAPABILITY_MAX
  79 };
  80 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
  81
  82 extern int selinux_policycap_netpeer;
  83 extern int selinux_policycap_openperm;
  84 extern int selinux_policycap_alwaysnetwork;
  85
  86 /*
  87  * type_datum properties
  88  * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
  89  */
  90 #define TYPEDATUM_PROPERTY_PRIMARY      0x0001
  91 #define TYPEDATUM_PROPERTY_ATTRIBUTE    0x0002
  92
  93 /* limitation of boundary depth  */
  94 #define POLICYDB_BOUNDS_MAXDEPTH        4
  95
  96 int security_mls_enabled(void);
  97
  98 int security_load_policy(void *data, size_t len);
  99 int security_read_policy(void **data, size_t *len);
 100 size_t security_policydb_len(void);
 101
 102 int security_policycap_supported(unsigned int req_cap);
 103
 104 #define SEL_VEC_MAX 32
 105 struct av_decision {
 106         u32 allowed;
 107         u32 auditallow;
 108         u32 auditdeny;
 109         u32 seqno;
 110         u32 flags;
 111 };
 112
 113 #define XPERMS_ALLOWED 1
 114 #define XPERMS_AUDITALLOW 2
 115 #define XPERMS_DONTAUDIT 4
 116
 117 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
 118 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
 119 struct extended_perms_data {
 120         u32 p[8];
 121 };
 122
 123 struct extended_perms_decision {
 124         u8 used;
 125         u8 driver;
 126         struct extended_perms_data *allowed;
 127         struct extended_perms_data *auditallow;
 128         struct extended_perms_data *dontaudit;
 129 };
 130
 131 struct extended_perms {
 132         u16 len;        /* length associated decision chain */
 133         struct extended_perms_data drivers; /* flag drivers that are used */
 134 };
 135
 136 /* definitions of av_decision.flags */
 137 #define AVD_FLAGS_PERMISSIVE    0x0001
 138
 139 void security_compute_av(u32 ssid, u32 tsid,
 140                          u16 tclass, struct av_decision *avd,
 141                          struct extended_perms *xperms);
 142
 143 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass,
 144                          u8 driver, struct extended_perms_decision *xpermd);
 145
 146 void security_compute_av_user(u32 ssid, u32 tsid,
 147                              u16 tclass, struct av_decision *avd);
 148
 149 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
 150                             const struct qstr *qstr, u32 *out_sid);
 151
 152 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
 153                                  const char *objname, u32 *out_sid);
 154
 155 int security_member_sid(u32 ssid, u32 tsid,
 156         u16 tclass, u32 *out_sid);
 157
 158 int security_change_sid(u32 ssid, u32 tsid,
 159         u16 tclass, u32 *out_sid);
 160
 161 int security_sid_to_context(u32 sid, char **scontext,
 162         u32 *scontext_len);
 163
 164 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
 165
 166 int security_context_to_sid(const char *scontext, u32 scontext_len,
 167                             u32 *out_sid, gfp_t gfp);
 168
 169 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
 170
 171 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
 172                                     u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
 173
 174 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
 175                                   u32 *sid);
 176
 177 int security_get_user_sids(u32 callsid, char *username,
 178                            u32 **sids, u32 *nel);
 179
 180 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
 181
 182 int security_netif_sid(char *name, u32 *if_sid);
 183
 184 int security_node_sid(u16 domain, void *addr, u32 addrlen,
 185         u32 *out_sid);
 186
 187 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
 188                                  u16 tclass);
 189
 190 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
 191                                       u16 tclass);
 192
 193 int security_bounded_transition(u32 oldsid, u32 newsid);
 194
 195 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
 196
 197 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
 198                                  u32 xfrm_sid,
 199                                  u32 *peer_sid);
 200
 201 int security_get_classes(char ***classes, int *nclasses);
 202 int security_get_permissions(char *class, char ***perms, int *nperms);
 203 int security_get_reject_unknown(void);
 204 int security_get_allow_unknown(void);
 205
 206 #define SECURITY_FS_USE_XATTR           1 /* use xattr */
 207 #define SECURITY_FS_USE_TRANS           2 /* use transition SIDs, e.g. devpts/tmpfs */
 208 #define SECURITY_FS_USE_TASK            3 /* use task SIDs, e.g. pipefs/sockfs */
 209 #define SECURITY_FS_USE_GENFS           4 /* use the genfs support */
 210 #define SECURITY_FS_USE_NONE            5 /* no labeling support */
 211 #define SECURITY_FS_USE_MNTPOINT        6 /* use mountpoint labeling */
 212 #define SECURITY_FS_USE_NATIVE          7 /* use native label support */
 213 #define SECURITY_FS_USE_MAX             7 /* Highest SECURITY_FS_USE_XXX */
 214
 215 int security_fs_use(struct super_block *sb);
 216
 217 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
 218         u32 *sid);
 219
 220 #ifdef CONFIG_NETLABEL
 221 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
 222                                    u32 *sid);
 223
 224 int security_netlbl_sid_to_secattr(u32 sid,
 225                                    struct netlbl_lsm_secattr *secattr);
 226 #else
 227 static inline int security_netlbl_secattr_to_sid(
 228                                             struct netlbl_lsm_secattr *secattr,
 229                                             u32 *sid)
 230 {
 231         return -EIDRM;
 232 }
 233
 234 static inline int security_netlbl_sid_to_secattr(u32 sid,
 235                                            struct netlbl_lsm_secattr *secattr)
 236 {
 237         return -ENOENT;
 238 }
 239 #endif /* CONFIG_NETLABEL */
 240
 241 const char *security_get_initial_sid_context(u32 sid);
 242
 243 /*
 244  * status notifier using mmap interface
 245  */
 246 extern struct page *selinux_kernel_status_page(void);
 247
 248 #define SELINUX_KERNEL_STATUS_VERSION   1
 249 struct selinux_kernel_status {
 250         u32     version;        /* version number of thie structure */
 251         u32     sequence;       /* sequence number of seqlock logic */
 252         u32     enforcing;      /* current setting of enforcing mode */
 253         u32     policyload;     /* times of policy reloaded */
 254         u32     deny_unknown;   /* current setting of deny_unknown */
 255         /*
 256          * The version > 0 supports above members.
 257          */
 258 } __packed;
 259
 260 extern void selinux_status_update_setenforce(int enforcing);
 261 extern void selinux_status_update_policyload(int seqno);
 262 extern void selinux_complete_init(void);
 263 extern int selinux_disable(void);
 264 extern void exit_sel_fs(void);
 265 extern struct path selinux_null;
 266 extern struct vfsmount *selinuxfs_mount;
 267 extern void selnl_notify_setenforce(int val);
 268 extern void selnl_notify_policyload(u32 seqno);
 269 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
 270
 271 #endif /* _SELINUX_SECURITY_H_ */
 272