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security.h
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1 /*
2  * Security server interface.
3  *
4  * Author : Stephen Smalley, <[email protected]>
5  *
6  */
7 
8 #ifndef _SELINUX_SECURITY_H_
9 #define _SELINUX_SECURITY_H_
10 
11 #include <linux/dcache.h>
12 #include <linux/magic.h>
13 #include <linux/types.h>
14 #include "flask.h"
15 
16 #define SECSID_NULL 0x00000000 /* unspecified SID */
17 #define SECSID_WILD 0xffffffff /* wildcard SID */
18 #define SECCLASS_NULL 0x0000 /* no class */
19 
20 /* Identify specific policy version changes */
21 #define POLICYDB_VERSION_BASE 15
22 #define POLICYDB_VERSION_BOOL 16
23 #define POLICYDB_VERSION_IPV6 17
24 #define POLICYDB_VERSION_NLCLASS 18
25 #define POLICYDB_VERSION_VALIDATETRANS 19
26 #define POLICYDB_VERSION_MLS 19
27 #define POLICYDB_VERSION_AVTAB 20
28 #define POLICYDB_VERSION_RANGETRANS 21
29 #define POLICYDB_VERSION_POLCAP 22
30 #define POLICYDB_VERSION_PERMISSIVE 23
31 #define POLICYDB_VERSION_BOUNDARY 24
32 #define POLICYDB_VERSION_FILENAME_TRANS 25
33 #define POLICYDB_VERSION_ROLETRANS 26
34 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27
35 #define POLICYDB_VERSION_DEFAULT_TYPE 28
36 
37 /* Range of policy versions we understand*/
38 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
39 #ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
40 #define POLICYDB_VERSION_MAX CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
41 #else
42 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_DEFAULT_TYPE
43 #endif
44 
45 /* Mask for just the mount related flags */
46 #define SE_MNTMASK 0x0f
47 /* Super block security struct flags for mount options */
48 #define CONTEXT_MNT 0x01
49 #define FSCONTEXT_MNT 0x02
50 #define ROOTCONTEXT_MNT 0x04
51 #define DEFCONTEXT_MNT 0x08
52 /* Non-mount related flags */
53 #define SE_SBINITIALIZED 0x10
54 #define SE_SBPROC 0x20
55 #define SE_SBLABELSUPP 0x40
56 
57 #define CONTEXT_STR "context="
58 #define FSCONTEXT_STR "fscontext="
59 #define ROOTCONTEXT_STR "rootcontext="
60 #define DEFCONTEXT_STR "defcontext="
61 #define LABELSUPP_STR "seclabel"
62 
63 struct netlbl_lsm_secattr;
64 
65 extern int selinux_enabled;
66 
67 /* Policy capabilities */
68 enum {
72 };
73 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
74 
75 extern int selinux_policycap_netpeer;
77 
78 /*
79  * type_datum properties
80  * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
81  */
82 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001
83 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
84 
85 /* limitation of boundary depth */
86 #define POLICYDB_BOUNDS_MAXDEPTH 4
87 
88 int security_mls_enabled(void);
89 
90 int security_load_policy(void *data, size_t len);
91 int security_read_policy(void **data, size_t *len);
92 size_t security_policydb_len(void);
93 
94 int security_policycap_supported(unsigned int req_cap);
95 
96 #define SEL_VEC_MAX 32
97 struct av_decision {
103 };
104 
105 /* definitions of av_decision.flags */
106 #define AVD_FLAGS_PERMISSIVE 0x0001
107 
108 void security_compute_av(u32 ssid, u32 tsid,
109  u16 tclass, struct av_decision *avd);
110 
112  u16 tclass, struct av_decision *avd);
113 
114 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
115  const struct qstr *qstr, u32 *out_sid);
116 
117 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
118  const char *objname, u32 *out_sid);
119 
120 int security_member_sid(u32 ssid, u32 tsid,
121  u16 tclass, u32 *out_sid);
122 
123 int security_change_sid(u32 ssid, u32 tsid,
124  u16 tclass, u32 *out_sid);
125 
126 int security_sid_to_context(u32 sid, char **scontext,
127  u32 *scontext_len);
128 
129 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
130 
131 int security_context_to_sid(const char *scontext, u32 scontext_len,
132  u32 *out_sid);
133 
134 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
135  u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
136 
137 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
138  u32 *sid);
139 
140 int security_get_user_sids(u32 callsid, char *username,
141  u32 **sids, u32 *nel);
142 
143 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
144 
145 int security_netif_sid(char *name, u32 *if_sid);
146 
147 int security_node_sid(u16 domain, void *addr, u32 addrlen,
148  u32 *out_sid);
149 
150 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
151  u16 tclass);
152 
153 int security_bounded_transition(u32 oldsid, u32 newsid);
154 
155 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
156 
157 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
158  u32 xfrm_sid,
159  u32 *peer_sid);
160 
161 int security_get_classes(char ***classes, int *nclasses);
162 int security_get_permissions(char *class, char ***perms, int *nperms);
165 
166 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
167 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
168 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
169 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
170 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
171 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
172 
173 int security_fs_use(const char *fstype, unsigned int *behavior,
174  u32 *sid);
175 
176 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
177  u32 *sid);
178 
179 #ifdef CONFIG_NETLABEL
180 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
181  u32 *sid);
182 
183 int security_netlbl_sid_to_secattr(u32 sid,
184  struct netlbl_lsm_secattr *secattr);
185 #else
186 static inline int security_netlbl_secattr_to_sid(
187  struct netlbl_lsm_secattr *secattr,
188  u32 *sid)
189 {
190  return -EIDRM;
191 }
192 
193 static inline int security_netlbl_sid_to_secattr(u32 sid,
194  struct netlbl_lsm_secattr *secattr)
195 {
196  return -ENOENT;
197 }
198 #endif /* CONFIG_NETLABEL */
199 
201 
202 /*
203  * status notifier using mmap interface
204  */
205 extern struct page *selinux_kernel_status_page(void);
206 
207 #define SELINUX_KERNEL_STATUS_VERSION 1
209  u32 version; /* version number of thie structure */
210  u32 sequence; /* sequence number of seqlock logic */
211  u32 enforcing; /* current setting of enforcing mode */
212  u32 policyload; /* times of policy reloaded */
213  u32 deny_unknown; /* current setting of deny_unknown */
214  /*
215  * The version > 0 supports above members.
216  */
217 } __attribute__((packed));
221 extern void selinux_complete_init(void);
222 extern int selinux_disable(void);
223 extern void exit_sel_fs(void);
224 extern struct path selinux_null;
225 extern struct vfsmount *selinuxfs_mount;
226 extern void selnl_notify_setenforce(int val);
227 extern void selnl_notify_policyload(u32 seqno);
228 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
229 
230 #endif /* _SELINUX_SECURITY_H_ */
231