1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Security server interface.
4 *
5 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
6 *
7 */
8
9 #ifndef _SELINUX_SECURITY_H_
10 #define _SELINUX_SECURITY_H_
11
12 #include <linux/compiler.h>
13 #include <linux/dcache.h>
14 #include <linux/magic.h>
15 #include <linux/types.h>
16 #include "flask.h"
17
18 #define SECSID_NULL 0x00000000 /* unspecified SID */
19 #define SECSID_WILD 0xffffffff /* wildcard SID */
20 #define SECCLASS_NULL 0x0000 /* no class */
21
22 /* Identify specific policy version changes */
23 #define POLICYDB_VERSION_BASE 15
24 #define POLICYDB_VERSION_BOOL 16
25 #define POLICYDB_VERSION_IPV6 17
26 #define POLICYDB_VERSION_NLCLASS 18
27 #define POLICYDB_VERSION_VALIDATETRANS 19
28 #define POLICYDB_VERSION_MLS 19
29 #define POLICYDB_VERSION_AVTAB 20
30 #define POLICYDB_VERSION_RANGETRANS 21
31 #define POLICYDB_VERSION_POLCAP 22
32 #define POLICYDB_VERSION_PERMISSIVE 23
33 #define POLICYDB_VERSION_BOUNDARY 24
34 #define POLICYDB_VERSION_FILENAME_TRANS 25
35 #define POLICYDB_VERSION_ROLETRANS 26
36 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27
37 #define POLICYDB_VERSION_DEFAULT_TYPE 28
38 #define POLICYDB_VERSION_CONSTRAINT_NAMES 29
39 #define POLICYDB_VERSION_XPERMS_IOCTL 30
40 #define POLICYDB_VERSION_INFINIBAND 31
41
42 /* Range of policy versions we understand*/
43 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
44 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_INFINIBAND
45
46 /* Mask for just the mount related flags */
47 #define SE_MNTMASK 0x0f
48 /* Super block security struct flags for mount options */
49 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
50 #define CONTEXT_MNT 0x01
51 #define FSCONTEXT_MNT 0x02
52 #define ROOTCONTEXT_MNT 0x04
53 #define DEFCONTEXT_MNT 0x08
54 #define SBLABEL_MNT 0x10
55 /* Non-mount related flags */
56 #define SE_SBINITIALIZED 0x0100
57 #define SE_SBPROC 0x0200
58 #define SE_SBGENFS 0x0400
59
60 #define CONTEXT_STR "context="
61 #define FSCONTEXT_STR "fscontext="
62 #define ROOTCONTEXT_STR "rootcontext="
63 #define DEFCONTEXT_STR "defcontext="
64 #define LABELSUPP_STR "seclabel"
65
66 struct netlbl_lsm_secattr;
67
68 extern int selinux_enabled;
69
70 /* Policy capabilities */
71 enum {
72 POLICYDB_CAPABILITY_NETPEER,
73 POLICYDB_CAPABILITY_OPENPERM,
74 POLICYDB_CAPABILITY_EXTSOCKCLASS,
75 POLICYDB_CAPABILITY_ALWAYSNETWORK,
76 POLICYDB_CAPABILITY_CGROUPSECLABEL,
77 POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION,
78 __POLICYDB_CAPABILITY_MAX
79 };
80 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
81
82 extern char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX];
83
84 extern int selinux_android_netlink_route;
85 extern int selinux_policycap_netpeer;
86 extern int selinux_policycap_openperm;
87 extern int selinux_policycap_extsockclass;
88 extern int selinux_policycap_alwaysnetwork;
89 extern int selinux_policycap_cgroupseclabel;
90 extern int selinux_policycap_nnp_nosuid_transition;
91
92 /*
93 * type_datum properties
94 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
95 */
96 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001
97 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
98
99 /* limitation of boundary depth */
100 #define POLICYDB_BOUNDS_MAXDEPTH 4
101
102 int security_mls_enabled(void);
103
104 int security_load_policy(void *data, size_t len);
105 int security_read_policy(void **data, size_t *len);
106 size_t security_policydb_len(void);
107
108 int security_policycap_supported(unsigned int req_cap);
109
110 #define SEL_VEC_MAX 32
111 struct av_decision {
112 u32 allowed;
113 u32 auditallow;
114 u32 auditdeny;
115 u32 seqno;
116 u32 flags;
117 };
118
119 #define XPERMS_ALLOWED 1
120 #define XPERMS_AUDITALLOW 2
121 #define XPERMS_DONTAUDIT 4
122
123 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
124 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
125 struct extended_perms_data {
126 u32 p[8];
127 };
128
129 struct extended_perms_decision {
130 u8 used;
131 u8 driver;
132 struct extended_perms_data *allowed;
133 struct extended_perms_data *auditallow;
134 struct extended_perms_data *dontaudit;
135 };
136
137 struct extended_perms {
138 u16 len; /* length associated decision chain */
139 struct extended_perms_data drivers; /* flag drivers that are used */
140 };
141
142 /* definitions of av_decision.flags */
143 #define AVD_FLAGS_PERMISSIVE 0x0001
144
145 void security_compute_av(u32 ssid, u32 tsid,
146 u16 tclass, struct av_decision *avd,
147 struct extended_perms *xperms);
148
149 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass,
150 u8 driver, struct extended_perms_decision *xpermd);
151
152 void security_compute_av_user(u32 ssid, u32 tsid,
153 u16 tclass, struct av_decision *avd);
154
155 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
156 const struct qstr *qstr, u32 *out_sid);
157
158 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
159 const char *objname, u32 *out_sid);
160
161 int security_member_sid(u32 ssid, u32 tsid,
162 u16 tclass, u32 *out_sid);
163
164 int security_change_sid(u32 ssid, u32 tsid,
165 u16 tclass, u32 *out_sid);
166
167 int security_sid_to_context(u32 sid, char **scontext,
168 u32 *scontext_len);
169
170 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
171
172 int security_context_to_sid(const char *scontext, u32 scontext_len,
173 u32 *out_sid, gfp_t gfp);
174
175 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
176
177 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
178 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
179
180 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
181 u32 *sid);
182
183 int security_get_user_sids(u32 callsid, char *username,
184 u32 **sids, u32 *nel);
185
186 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
187
188 int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
189
190 int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
191
192 int security_netif_sid(char *name, u32 *if_sid);
193
194 int security_node_sid(u16 domain, void *addr, u32 addrlen,
195 u32 *out_sid);
196
197 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
198 u16 tclass);
199
200 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
201 u16 tclass);
202
203 int security_bounded_transition(u32 oldsid, u32 newsid);
204
205 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
206
207 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
208 u32 xfrm_sid,
209 u32 *peer_sid);
210
211 int security_get_classes(char ***classes, int *nclasses);
212 int security_get_permissions(char *class, char ***perms, int *nperms);
213 int security_get_reject_unknown(void);
214 int security_get_allow_unknown(void);
215
216 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
217 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
218 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
219 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
220 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
221 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
222 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
223 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
224
225 int security_fs_use(struct super_block *sb);
226
227 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
228 u32 *sid);
229
230 #ifdef CONFIG_NETLABEL
231 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
232 u32 *sid);
233
234 int security_netlbl_sid_to_secattr(u32 sid,
235 struct netlbl_lsm_secattr *secattr);
236 #else
security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr * secattr,u32 * sid)237 static inline int security_netlbl_secattr_to_sid(
238 struct netlbl_lsm_secattr *secattr,
239 u32 *sid)
240 {
241 return -EIDRM;
242 }
243
security_netlbl_sid_to_secattr(u32 sid,struct netlbl_lsm_secattr * secattr)244 static inline int security_netlbl_sid_to_secattr(u32 sid,
245 struct netlbl_lsm_secattr *secattr)
246 {
247 return -ENOENT;
248 }
249 #endif /* CONFIG_NETLABEL */
250
251 const char *security_get_initial_sid_context(u32 sid);
252
253 /*
254 * status notifier using mmap interface
255 */
256 extern struct page *selinux_kernel_status_page(void);
257
258 #define SELINUX_KERNEL_STATUS_VERSION 1
259 struct selinux_kernel_status {
260 u32 version; /* version number of thie structure */
261 u32 sequence; /* sequence number of seqlock logic */
262 u32 enforcing; /* current setting of enforcing mode */
263 u32 policyload; /* times of policy reloaded */
264 u32 deny_unknown; /* current setting of deny_unknown */
265 /*
266 * The version > 0 supports above members.
267 */
268 } __packed;
269
270 extern void selinux_status_update_setenforce(int enforcing);
271 extern void selinux_status_update_policyload(int seqno);
272 extern void selinux_complete_init(void);
273 extern int selinux_disable(void);
274 extern void exit_sel_fs(void);
275 extern struct path selinux_null;
276 extern struct vfsmount *selinuxfs_mount;
277 extern void selnl_notify_setenforce(int val);
278 extern void selnl_notify_policyload(u32 seqno);
279 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
280 extern void selinux_nlmsg_init(void);
281
282 #endif /* _SELINUX_SECURITY_H_ */
283
284