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e114e473 CS |
1 | /* |
2 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, version 2. | |
7 | * | |
8 | * Author: | |
9 | * Casey Schaufler <casey@schaufler-ca.com> | |
10 | * | |
11 | */ | |
12 | ||
13 | #ifndef _SECURITY_SMACK_H | |
14 | #define _SECURITY_SMACK_H | |
15 | ||
16 | #include <linux/capability.h> | |
17 | #include <linux/spinlock.h> | |
076c54c5 | 18 | #include <linux/security.h> |
6d3dc07c | 19 | #include <linux/in.h> |
e114e473 | 20 | #include <net/netlabel.h> |
7198e2ee EB |
21 | #include <linux/list.h> |
22 | #include <linux/rculist.h> | |
ecfcc53f | 23 | #include <linux/lsm_audit.h> |
e114e473 CS |
24 | |
25 | /* | |
26 | * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is | |
27 | * bigger than can be used, and 24 is the next lower multiple | |
28 | * of 8, and there are too many issues if there isn't space set | |
29 | * aside for the terminating null byte. | |
30 | */ | |
31 | #define SMK_MAXLEN 23 | |
32 | #define SMK_LABELLEN (SMK_MAXLEN+1) | |
33 | ||
e114e473 CS |
34 | struct superblock_smack { |
35 | char *smk_root; | |
36 | char *smk_floor; | |
37 | char *smk_hat; | |
38 | char *smk_default; | |
39 | int smk_initialized; | |
40 | spinlock_t smk_sblock; /* for initialization */ | |
41 | }; | |
42 | ||
43 | struct socket_smack { | |
44 | char *smk_out; /* outbound label */ | |
45 | char *smk_in; /* inbound label */ | |
46 | char smk_packet[SMK_LABELLEN]; /* TCP peer label */ | |
47 | }; | |
48 | ||
49 | /* | |
50 | * Inode smack data | |
51 | */ | |
52 | struct inode_smack { | |
53 | char *smk_inode; /* label of the fso */ | |
54 | struct mutex smk_lock; /* initialization lock */ | |
55 | int smk_flags; /* smack inode flags */ | |
56 | }; | |
57 | ||
58 | #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ | |
59 | ||
60 | /* | |
61 | * A label access rule. | |
62 | */ | |
63 | struct smack_rule { | |
7198e2ee EB |
64 | struct list_head list; |
65 | char *smk_subject; | |
66 | char *smk_object; | |
67 | int smk_access; | |
e114e473 CS |
68 | }; |
69 | ||
70 | /* | |
71 | * An entry in the table mapping smack values to | |
72 | * CIPSO level/category-set values. | |
73 | */ | |
74 | struct smack_cipso { | |
75 | int smk_level; | |
76 | char smk_catset[SMK_LABELLEN]; | |
77 | }; | |
78 | ||
6d3dc07c CS |
79 | /* |
80 | * An entry in the table identifying hosts. | |
81 | */ | |
82 | struct smk_netlbladdr { | |
7198e2ee | 83 | struct list_head list; |
6d3dc07c CS |
84 | struct sockaddr_in smk_host; /* network address */ |
85 | struct in_addr smk_mask; /* network mask */ | |
86 | char *smk_label; /* label */ | |
87 | }; | |
88 | ||
e114e473 CS |
89 | /* |
90 | * This is the repository for labels seen so that it is | |
91 | * not necessary to keep allocating tiny chuncks of memory | |
92 | * and so that they can be shared. | |
93 | * | |
94 | * Labels are never modified in place. Anytime a label | |
95 | * is imported (e.g. xattrset on a file) the list is checked | |
96 | * for it and it is added if it doesn't exist. The address | |
97 | * is passed out in either case. Entries are added, but | |
98 | * never deleted. | |
99 | * | |
100 | * Since labels are hanging around anyway it doesn't | |
101 | * hurt to maintain a secid for those awkward situations | |
102 | * where kernel components that ought to use LSM independent | |
103 | * interfaces don't. The secid should go away when all of | |
104 | * these components have been repaired. | |
105 | * | |
106 | * If there is a cipso value associated with the label it | |
107 | * gets stored here, too. This will most likely be rare as | |
108 | * the cipso direct mapping in used internally. | |
109 | */ | |
110 | struct smack_known { | |
7198e2ee | 111 | struct list_head list; |
e114e473 CS |
112 | char smk_known[SMK_LABELLEN]; |
113 | u32 smk_secid; | |
114 | struct smack_cipso *smk_cipso; | |
115 | spinlock_t smk_cipsolock; /* for changing cipso map */ | |
116 | }; | |
117 | ||
118 | /* | |
119 | * Mount options | |
120 | */ | |
121 | #define SMK_FSDEFAULT "smackfsdef=" | |
122 | #define SMK_FSFLOOR "smackfsfloor=" | |
123 | #define SMK_FSHAT "smackfshat=" | |
124 | #define SMK_FSROOT "smackfsroot=" | |
125 | ||
4303154e EB |
126 | #define SMACK_CIPSO_OPTION "-CIPSO" |
127 | ||
e114e473 | 128 | /* |
6d3dc07c CS |
129 | * How communications on this socket are treated. |
130 | * Usually it's determined by the underlying netlabel code | |
131 | * but there are certain cases, including single label hosts | |
132 | * and potentially single label interfaces for which the | |
133 | * treatment can not be known in advance. | |
134 | * | |
135 | * The possibility of additional labeling schemes being | |
136 | * introduced in the future exists as well. | |
137 | */ | |
138 | #define SMACK_UNLABELED_SOCKET 0 | |
139 | #define SMACK_CIPSO_SOCKET 1 | |
140 | ||
141 | /* | |
142 | * smackfs magic number | |
e114e473 CS |
143 | * smackfs macic number |
144 | */ | |
145 | #define SMACK_MAGIC 0x43415d53 /* "SMAC" */ | |
146 | ||
147 | /* | |
148 | * A limit on the number of entries in the lists | |
149 | * makes some of the list administration easier. | |
150 | */ | |
151 | #define SMACK_LIST_MAX 10000 | |
152 | ||
153 | /* | |
154 | * CIPSO defaults. | |
155 | */ | |
156 | #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ | |
6d3dc07c | 157 | #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */ |
e114e473 CS |
158 | #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ |
159 | #define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */ | |
160 | #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ | |
161 | #define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */ | |
162 | ||
163 | /* | |
164 | * Just to make the common cases easier to deal with | |
165 | */ | |
166 | #define MAY_ANY (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC) | |
167 | #define MAY_ANYREAD (MAY_READ | MAY_EXEC) | |
168 | #define MAY_ANYWRITE (MAY_WRITE | MAY_APPEND) | |
169 | #define MAY_READWRITE (MAY_READ | MAY_WRITE) | |
170 | #define MAY_NOT 0 | |
171 | ||
ecfcc53f EB |
172 | /* |
173 | * Number of access types used by Smack (rwxa) | |
174 | */ | |
175 | #define SMK_NUM_ACCESS_TYPE 4 | |
176 | ||
177 | /* | |
178 | * Smack audit data; is empty if CONFIG_AUDIT not set | |
179 | * to save some stack | |
180 | */ | |
181 | struct smk_audit_info { | |
182 | #ifdef CONFIG_AUDIT | |
183 | struct common_audit_data a; | |
184 | #endif | |
185 | }; | |
e114e473 CS |
186 | /* |
187 | * These functions are in smack_lsm.c | |
188 | */ | |
189 | struct inode_smack *new_inode_smack(char *); | |
190 | ||
191 | /* | |
192 | * These functions are in smack_access.c | |
193 | */ | |
ecfcc53f EB |
194 | int smk_access(char *, char *, int, struct smk_audit_info *); |
195 | int smk_curacc(char *, u32, struct smk_audit_info *); | |
e114e473 CS |
196 | int smack_to_cipso(const char *, struct smack_cipso *); |
197 | void smack_from_cipso(u32, char *, char *); | |
198 | char *smack_from_secid(const u32); | |
199 | char *smk_import(const char *, int); | |
200 | struct smack_known *smk_import_entry(const char *, int); | |
201 | u32 smack_to_secid(const char *); | |
202 | ||
203 | /* | |
204 | * Shared data. | |
205 | */ | |
206 | extern int smack_cipso_direct; | |
e114e473 | 207 | extern char *smack_net_ambient; |
15446235 | 208 | extern char *smack_onlycap; |
4303154e | 209 | extern const char *smack_cipso_option; |
e114e473 | 210 | |
e114e473 CS |
211 | extern struct smack_known smack_known_floor; |
212 | extern struct smack_known smack_known_hat; | |
213 | extern struct smack_known smack_known_huh; | |
214 | extern struct smack_known smack_known_invalid; | |
215 | extern struct smack_known smack_known_star; | |
6d3dc07c | 216 | extern struct smack_known smack_known_web; |
e114e473 | 217 | |
7198e2ee EB |
218 | extern struct list_head smack_known_list; |
219 | extern struct list_head smack_rule_list; | |
220 | extern struct list_head smk_netlbladdr_list; | |
221 | ||
076c54c5 | 222 | extern struct security_operations smack_ops; |
e114e473 CS |
223 | |
224 | /* | |
225 | * Stricly for CIPSO level manipulation. | |
226 | * Set the category bit number in a smack label sized buffer. | |
227 | */ | |
228 | static inline void smack_catset_bit(int cat, char *catsetp) | |
229 | { | |
230 | if (cat > SMK_LABELLEN * 8) | |
231 | return; | |
232 | ||
233 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
234 | } | |
235 | ||
236 | /* | |
237 | * Present a pointer to the smack label in an inode blob. | |
238 | */ | |
239 | static inline char *smk_of_inode(const struct inode *isp) | |
240 | { | |
241 | struct inode_smack *sip = isp->i_security; | |
242 | return sip->smk_inode; | |
243 | } | |
244 | ||
ecfcc53f EB |
245 | /* |
246 | * logging functions | |
247 | */ | |
248 | #define SMACK_AUDIT_DENIED 0x1 | |
249 | #define SMACK_AUDIT_ACCEPT 0x2 | |
250 | extern int log_policy; | |
251 | ||
252 | void smack_log(char *subject_label, char *object_label, | |
253 | int request, | |
254 | int result, struct smk_audit_info *auditdata); | |
255 | ||
256 | #ifdef CONFIG_AUDIT | |
257 | ||
258 | /* | |
259 | * some inline functions to set up audit data | |
260 | * they do nothing if CONFIG_AUDIT is not set | |
261 | * | |
262 | */ | |
263 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
264 | char type) | |
265 | { | |
266 | memset(a, 0, sizeof(*a)); | |
267 | a->a.type = type; | |
d4131ded | 268 | a->a.smack_audit_data.function = func; |
ecfcc53f EB |
269 | } |
270 | ||
271 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
272 | struct task_struct *t) | |
273 | { | |
274 | a->a.u.tsk = t; | |
275 | } | |
276 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
277 | struct dentry *d) | |
278 | { | |
279 | a->a.u.fs.path.dentry = d; | |
280 | } | |
281 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
282 | struct vfsmount *m) | |
283 | { | |
284 | a->a.u.fs.path.mnt = m; | |
285 | } | |
286 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
287 | struct inode *i) | |
288 | { | |
289 | a->a.u.fs.inode = i; | |
290 | } | |
291 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
292 | struct path p) | |
293 | { | |
294 | a->a.u.fs.path = p; | |
295 | } | |
296 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
297 | struct sock *sk) | |
298 | { | |
299 | a->a.u.net.sk = sk; | |
300 | } | |
301 | ||
302 | #else /* no AUDIT */ | |
303 | ||
304 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
305 | char type) | |
306 | { | |
307 | } | |
308 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
309 | struct task_struct *t) | |
310 | { | |
311 | } | |
312 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
313 | struct dentry *d) | |
314 | { | |
315 | } | |
316 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
317 | struct vfsmount *m) | |
318 | { | |
319 | } | |
320 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
321 | struct inode *i) | |
322 | { | |
323 | } | |
324 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
325 | struct path p) | |
326 | { | |
327 | } | |
328 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
329 | struct sock *sk) | |
330 | { | |
331 | } | |
332 | #endif | |
333 | ||
e114e473 | 334 | #endif /* _SECURITY_SMACK_H */ |