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_to_sid_default(const char *scontext, u32 scontext_len,
170 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
171
172 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
173 u32 *sid);
174
175 int security_get_user_sids(u32 callsid, char *username,
176 u32 **sids, u32 *nel);
177
178 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
179
180 int security_netif_sid(char *name, u32 *if_sid);
181
182 int security_node_sid(u16 domain, void *addr, u32 addrlen,
183 u32 *out_sid);
184
185 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
186 u16 tclass);
187
188 int security_bounded_transition(u32 oldsid, u32 newsid);
189
190 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
191
192 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
193 u32 xfrm_sid,
194 u32 *peer_sid);
195
196 int security_get_classes(char ***classes, int *nclasses);
197 int security_get_permissions(char *class, char ***perms, int *nperms);
198 int security_get_reject_unknown(void);
199 int security_get_allow_unknown(void);
200
201 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
202 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
203 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
204 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
205 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
206 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
207 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
208 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
209
210 int security_fs_use(struct super_block *sb);
211
212 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
213 u32 *sid);
214
215 #ifdef CONFIG_NETLABEL
216 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
217 u32 *sid);
218
219 int security_netlbl_sid_to_secattr(u32 sid,
220 struct netlbl_lsm_secattr *secattr);
221 #else
security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr * secattr,u32 * sid)222 static inline int security_netlbl_secattr_to_sid(
223 struct netlbl_lsm_secattr *secattr,
224 u32 *sid)
225 {
226 return -EIDRM;
227 }
228
security_netlbl_sid_to_secattr(u32 sid,struct netlbl_lsm_secattr * secattr)229 static inline int security_netlbl_sid_to_secattr(u32 sid,
230 struct netlbl_lsm_secattr *secattr)
231 {
232 return -ENOENT;
233 }
234 #endif /* CONFIG_NETLABEL */
235
236 const char *security_get_initial_sid_context(u32 sid);
237
238 /*
239 * status notifier using mmap interface
240 */
241 extern struct page *selinux_kernel_status_page(void);
242
243 #define SELINUX_KERNEL_STATUS_VERSION 1
244 struct selinux_kernel_status {
245 u32 version; /* version number of thie structure */
246 u32 sequence; /* sequence number of seqlock logic */
247 u32 enforcing; /* current setting of enforcing mode */
248 u32 policyload; /* times of policy reloaded */
249 u32 deny_unknown; /* current setting of deny_unknown */
250 /*
251 * The version > 0 supports above members.
252 */
253 } __packed;
254
255 extern void selinux_status_update_setenforce(int enforcing);
256 extern void selinux_status_update_policyload(int seqno);
257 extern void selinux_complete_init(void);
258 extern int selinux_disable(void);
259 extern void exit_sel_fs(void);
260 extern struct path selinux_null;
261 extern struct vfsmount *selinuxfs_mount;
262 extern void selnl_notify_setenforce(int val);
263 extern void selnl_notify_policyload(u32 seqno);
264 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
265
266 #endif /* _SELINUX_SECURITY_H_ */
267
268