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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 */ | |
676dac4b | 54 | char *smk_task; /* label of the task */ |
7898e1f8 | 55 | char *smk_mmap; /* label of the mmap domain */ |
e114e473 CS |
56 | struct mutex smk_lock; /* initialization lock */ |
57 | int smk_flags; /* smack inode flags */ | |
58 | }; | |
59 | ||
676dac4b | 60 | struct task_smack { |
7898e1f8 CS |
61 | char *smk_task; /* label for access control */ |
62 | char *smk_forked; /* label when forked */ | |
63 | struct list_head smk_rules; /* per task access rules */ | |
64 | struct mutex smk_rules_lock; /* lock for the rules */ | |
676dac4b CS |
65 | }; |
66 | ||
e114e473 | 67 | #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ |
5c6d1125 | 68 | #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */ |
e114e473 CS |
69 | |
70 | /* | |
71 | * A label access rule. | |
72 | */ | |
73 | struct smack_rule { | |
7198e2ee EB |
74 | struct list_head list; |
75 | char *smk_subject; | |
76 | char *smk_object; | |
77 | int smk_access; | |
e114e473 CS |
78 | }; |
79 | ||
80 | /* | |
81 | * An entry in the table mapping smack values to | |
82 | * CIPSO level/category-set values. | |
83 | */ | |
84 | struct smack_cipso { | |
85 | int smk_level; | |
86 | char smk_catset[SMK_LABELLEN]; | |
87 | }; | |
88 | ||
6d3dc07c CS |
89 | /* |
90 | * An entry in the table identifying hosts. | |
91 | */ | |
92 | struct smk_netlbladdr { | |
7198e2ee | 93 | struct list_head list; |
6d3dc07c CS |
94 | struct sockaddr_in smk_host; /* network address */ |
95 | struct in_addr smk_mask; /* network mask */ | |
96 | char *smk_label; /* label */ | |
97 | }; | |
98 | ||
e114e473 CS |
99 | /* |
100 | * This is the repository for labels seen so that it is | |
101 | * not necessary to keep allocating tiny chuncks of memory | |
102 | * and so that they can be shared. | |
103 | * | |
104 | * Labels are never modified in place. Anytime a label | |
105 | * is imported (e.g. xattrset on a file) the list is checked | |
106 | * for it and it is added if it doesn't exist. The address | |
107 | * is passed out in either case. Entries are added, but | |
108 | * never deleted. | |
109 | * | |
110 | * Since labels are hanging around anyway it doesn't | |
111 | * hurt to maintain a secid for those awkward situations | |
112 | * where kernel components that ought to use LSM independent | |
113 | * interfaces don't. The secid should go away when all of | |
114 | * these components have been repaired. | |
115 | * | |
116 | * If there is a cipso value associated with the label it | |
117 | * gets stored here, too. This will most likely be rare as | |
118 | * the cipso direct mapping in used internally. | |
119 | */ | |
120 | struct smack_known { | |
7198e2ee | 121 | struct list_head list; |
e114e473 CS |
122 | char smk_known[SMK_LABELLEN]; |
123 | u32 smk_secid; | |
124 | struct smack_cipso *smk_cipso; | |
125 | spinlock_t smk_cipsolock; /* for changing cipso map */ | |
126 | }; | |
127 | ||
128 | /* | |
129 | * Mount options | |
130 | */ | |
131 | #define SMK_FSDEFAULT "smackfsdef=" | |
132 | #define SMK_FSFLOOR "smackfsfloor=" | |
133 | #define SMK_FSHAT "smackfshat=" | |
134 | #define SMK_FSROOT "smackfsroot=" | |
135 | ||
4303154e EB |
136 | #define SMACK_CIPSO_OPTION "-CIPSO" |
137 | ||
e114e473 | 138 | /* |
6d3dc07c CS |
139 | * How communications on this socket are treated. |
140 | * Usually it's determined by the underlying netlabel code | |
141 | * but there are certain cases, including single label hosts | |
142 | * and potentially single label interfaces for which the | |
143 | * treatment can not be known in advance. | |
144 | * | |
145 | * The possibility of additional labeling schemes being | |
146 | * introduced in the future exists as well. | |
147 | */ | |
148 | #define SMACK_UNLABELED_SOCKET 0 | |
149 | #define SMACK_CIPSO_SOCKET 1 | |
150 | ||
151 | /* | |
152 | * smackfs magic number | |
e114e473 CS |
153 | * smackfs macic number |
154 | */ | |
155 | #define SMACK_MAGIC 0x43415d53 /* "SMAC" */ | |
156 | ||
e114e473 CS |
157 | /* |
158 | * CIPSO defaults. | |
159 | */ | |
160 | #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ | |
6d3dc07c | 161 | #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */ |
e114e473 CS |
162 | #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ |
163 | #define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */ | |
164 | #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ | |
165 | #define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */ | |
166 | ||
5c6d1125 JS |
167 | /* |
168 | * Flag for transmute access | |
169 | */ | |
170 | #define MAY_TRANSMUTE 64 | |
e114e473 CS |
171 | /* |
172 | * Just to make the common cases easier to deal with | |
173 | */ | |
e114e473 | 174 | #define MAY_ANYREAD (MAY_READ | MAY_EXEC) |
e114e473 CS |
175 | #define MAY_READWRITE (MAY_READ | MAY_WRITE) |
176 | #define MAY_NOT 0 | |
177 | ||
ecfcc53f EB |
178 | /* |
179 | * Number of access types used by Smack (rwxa) | |
180 | */ | |
181 | #define SMK_NUM_ACCESS_TYPE 4 | |
182 | ||
183 | /* | |
184 | * Smack audit data; is empty if CONFIG_AUDIT not set | |
185 | * to save some stack | |
186 | */ | |
187 | struct smk_audit_info { | |
188 | #ifdef CONFIG_AUDIT | |
189 | struct common_audit_data a; | |
190 | #endif | |
191 | }; | |
e114e473 CS |
192 | /* |
193 | * These functions are in smack_lsm.c | |
194 | */ | |
195 | struct inode_smack *new_inode_smack(char *); | |
196 | ||
197 | /* | |
198 | * These functions are in smack_access.c | |
199 | */ | |
7898e1f8 | 200 | int smk_access_entry(char *, char *, struct list_head *); |
ecfcc53f EB |
201 | int smk_access(char *, char *, int, struct smk_audit_info *); |
202 | int smk_curacc(char *, u32, struct smk_audit_info *); | |
e114e473 CS |
203 | int smack_to_cipso(const char *, struct smack_cipso *); |
204 | void smack_from_cipso(u32, char *, char *); | |
205 | char *smack_from_secid(const u32); | |
206 | char *smk_import(const char *, int); | |
207 | struct smack_known *smk_import_entry(const char *, int); | |
208 | u32 smack_to_secid(const char *); | |
209 | ||
210 | /* | |
211 | * Shared data. | |
212 | */ | |
213 | extern int smack_cipso_direct; | |
e114e473 | 214 | extern char *smack_net_ambient; |
15446235 | 215 | extern char *smack_onlycap; |
4303154e | 216 | extern const char *smack_cipso_option; |
e114e473 | 217 | |
e114e473 CS |
218 | extern struct smack_known smack_known_floor; |
219 | extern struct smack_known smack_known_hat; | |
220 | extern struct smack_known smack_known_huh; | |
221 | extern struct smack_known smack_known_invalid; | |
222 | extern struct smack_known smack_known_star; | |
6d3dc07c | 223 | extern struct smack_known smack_known_web; |
e114e473 | 224 | |
7198e2ee EB |
225 | extern struct list_head smack_known_list; |
226 | extern struct list_head smack_rule_list; | |
227 | extern struct list_head smk_netlbladdr_list; | |
228 | ||
076c54c5 | 229 | extern struct security_operations smack_ops; |
e114e473 CS |
230 | |
231 | /* | |
232 | * Stricly for CIPSO level manipulation. | |
233 | * Set the category bit number in a smack label sized buffer. | |
234 | */ | |
235 | static inline void smack_catset_bit(int cat, char *catsetp) | |
236 | { | |
237 | if (cat > SMK_LABELLEN * 8) | |
238 | return; | |
239 | ||
240 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
241 | } | |
242 | ||
5c6d1125 JS |
243 | /* |
244 | * Is the directory transmuting? | |
245 | */ | |
246 | static inline int smk_inode_transmutable(const struct inode *isp) | |
247 | { | |
248 | struct inode_smack *sip = isp->i_security; | |
249 | return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; | |
250 | } | |
251 | ||
e114e473 CS |
252 | /* |
253 | * Present a pointer to the smack label in an inode blob. | |
254 | */ | |
255 | static inline char *smk_of_inode(const struct inode *isp) | |
256 | { | |
257 | struct inode_smack *sip = isp->i_security; | |
258 | return sip->smk_inode; | |
259 | } | |
260 | ||
676dac4b CS |
261 | /* |
262 | * Present a pointer to the smack label in an task blob. | |
263 | */ | |
264 | static inline char *smk_of_task(const struct task_smack *tsp) | |
265 | { | |
266 | return tsp->smk_task; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Present a pointer to the forked smack label in an task blob. | |
271 | */ | |
272 | static inline char *smk_of_forked(const struct task_smack *tsp) | |
273 | { | |
274 | return tsp->smk_forked; | |
275 | } | |
276 | ||
277 | /* | |
5c6d1125 | 278 | * Present a pointer to the smack label in the current task blob. |
676dac4b CS |
279 | */ |
280 | static inline char *smk_of_current(void) | |
281 | { | |
282 | return smk_of_task(current_security()); | |
283 | } | |
284 | ||
ecfcc53f EB |
285 | /* |
286 | * logging functions | |
287 | */ | |
288 | #define SMACK_AUDIT_DENIED 0x1 | |
289 | #define SMACK_AUDIT_ACCEPT 0x2 | |
290 | extern int log_policy; | |
291 | ||
292 | void smack_log(char *subject_label, char *object_label, | |
293 | int request, | |
294 | int result, struct smk_audit_info *auditdata); | |
295 | ||
296 | #ifdef CONFIG_AUDIT | |
297 | ||
298 | /* | |
299 | * some inline functions to set up audit data | |
300 | * they do nothing if CONFIG_AUDIT is not set | |
301 | * | |
302 | */ | |
303 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
304 | char type) | |
305 | { | |
306 | memset(a, 0, sizeof(*a)); | |
307 | a->a.type = type; | |
d4131ded | 308 | a->a.smack_audit_data.function = func; |
ecfcc53f EB |
309 | } |
310 | ||
311 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
312 | struct task_struct *t) | |
313 | { | |
314 | a->a.u.tsk = t; | |
315 | } | |
316 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
317 | struct dentry *d) | |
318 | { | |
a269434d | 319 | a->a.u.dentry = d; |
ecfcc53f EB |
320 | } |
321 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
322 | struct inode *i) | |
323 | { | |
f48b7399 | 324 | a->a.u.inode = i; |
ecfcc53f EB |
325 | } |
326 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
327 | struct path p) | |
328 | { | |
f48b7399 | 329 | a->a.u.path = p; |
ecfcc53f EB |
330 | } |
331 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
332 | struct sock *sk) | |
333 | { | |
334 | a->a.u.net.sk = sk; | |
335 | } | |
336 | ||
337 | #else /* no AUDIT */ | |
338 | ||
339 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
340 | char type) | |
341 | { | |
342 | } | |
343 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
344 | struct task_struct *t) | |
345 | { | |
346 | } | |
347 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
348 | struct dentry *d) | |
349 | { | |
350 | } | |
351 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
352 | struct vfsmount *m) | |
353 | { | |
354 | } | |
355 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
356 | struct inode *i) | |
357 | { | |
358 | } | |
359 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
360 | struct path p) | |
361 | { | |
362 | } | |
363 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
364 | struct sock *sk) | |
365 | { | |
366 | } | |
367 | #endif | |
368 | ||
e114e473 | 369 | #endif /* _SECURITY_SMACK_H */ |