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Linux/security/selinux/include/security.h

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

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