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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 { | |
272cd7a8 CS |
44 | char *smk_out; /* outbound label */ |
45 | char *smk_in; /* inbound label */ | |
46 | char *smk_packet; /* TCP peer label */ | |
e114e473 CS |
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. | |
272cd7a8 CS |
119 | * |
120 | * Keep the access rules for this subject label here so that | |
121 | * the entire set of rules does not need to be examined every | |
122 | * time. | |
e114e473 CS |
123 | */ |
124 | struct smack_known { | |
7198e2ee | 125 | struct list_head list; |
e114e473 CS |
126 | char smk_known[SMK_LABELLEN]; |
127 | u32 smk_secid; | |
128 | struct smack_cipso *smk_cipso; | |
272cd7a8 CS |
129 | spinlock_t smk_cipsolock; /* for changing cipso map */ |
130 | struct list_head smk_rules; /* access rules */ | |
131 | struct mutex smk_rules_lock; /* lock for the rules */ | |
e114e473 CS |
132 | }; |
133 | ||
134 | /* | |
135 | * Mount options | |
136 | */ | |
137 | #define SMK_FSDEFAULT "smackfsdef=" | |
138 | #define SMK_FSFLOOR "smackfsfloor=" | |
139 | #define SMK_FSHAT "smackfshat=" | |
140 | #define SMK_FSROOT "smackfsroot=" | |
141 | ||
4303154e EB |
142 | #define SMACK_CIPSO_OPTION "-CIPSO" |
143 | ||
e114e473 | 144 | /* |
6d3dc07c CS |
145 | * How communications on this socket are treated. |
146 | * Usually it's determined by the underlying netlabel code | |
147 | * but there are certain cases, including single label hosts | |
148 | * and potentially single label interfaces for which the | |
149 | * treatment can not be known in advance. | |
150 | * | |
151 | * The possibility of additional labeling schemes being | |
152 | * introduced in the future exists as well. | |
153 | */ | |
154 | #define SMACK_UNLABELED_SOCKET 0 | |
155 | #define SMACK_CIPSO_SOCKET 1 | |
156 | ||
157 | /* | |
158 | * smackfs magic number | |
e114e473 CS |
159 | */ |
160 | #define SMACK_MAGIC 0x43415d53 /* "SMAC" */ | |
161 | ||
e114e473 CS |
162 | /* |
163 | * CIPSO defaults. | |
164 | */ | |
165 | #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ | |
6d3dc07c | 166 | #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */ |
e114e473 CS |
167 | #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ |
168 | #define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */ | |
169 | #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ | |
170 | #define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */ | |
171 | ||
5c6d1125 JS |
172 | /* |
173 | * Flag for transmute access | |
174 | */ | |
175 | #define MAY_TRANSMUTE 64 | |
e114e473 CS |
176 | /* |
177 | * Just to make the common cases easier to deal with | |
178 | */ | |
e114e473 | 179 | #define MAY_ANYREAD (MAY_READ | MAY_EXEC) |
e114e473 CS |
180 | #define MAY_READWRITE (MAY_READ | MAY_WRITE) |
181 | #define MAY_NOT 0 | |
182 | ||
ecfcc53f | 183 | /* |
ce8a4321 | 184 | * Number of access types used by Smack (rwxat) |
ecfcc53f | 185 | */ |
ce8a4321 | 186 | #define SMK_NUM_ACCESS_TYPE 5 |
ecfcc53f | 187 | |
3b3b0e4f EP |
188 | /* SMACK data */ |
189 | struct smack_audit_data { | |
190 | const char *function; | |
191 | char *subject; | |
192 | char *object; | |
193 | char *request; | |
194 | int result; | |
195 | }; | |
196 | ||
ecfcc53f EB |
197 | /* |
198 | * Smack audit data; is empty if CONFIG_AUDIT not set | |
199 | * to save some stack | |
200 | */ | |
201 | struct smk_audit_info { | |
202 | #ifdef CONFIG_AUDIT | |
203 | struct common_audit_data a; | |
3b3b0e4f | 204 | struct smack_audit_data sad; |
ecfcc53f EB |
205 | #endif |
206 | }; | |
e114e473 CS |
207 | /* |
208 | * These functions are in smack_lsm.c | |
209 | */ | |
210 | struct inode_smack *new_inode_smack(char *); | |
211 | ||
212 | /* | |
213 | * These functions are in smack_access.c | |
214 | */ | |
7898e1f8 | 215 | int smk_access_entry(char *, char *, struct list_head *); |
ecfcc53f EB |
216 | int smk_access(char *, char *, int, struct smk_audit_info *); |
217 | int smk_curacc(char *, u32, struct smk_audit_info *); | |
e114e473 | 218 | int smack_to_cipso(const char *, struct smack_cipso *); |
272cd7a8 | 219 | char *smack_from_cipso(u32, char *); |
e114e473 | 220 | char *smack_from_secid(const u32); |
0e94ae17 | 221 | void smk_parse_smack(const char *string, int len, char *smack); |
e114e473 CS |
222 | char *smk_import(const char *, int); |
223 | struct smack_known *smk_import_entry(const char *, int); | |
272cd7a8 | 224 | struct smack_known *smk_find_entry(const char *); |
e114e473 CS |
225 | u32 smack_to_secid(const char *); |
226 | ||
227 | /* | |
228 | * Shared data. | |
229 | */ | |
230 | extern int smack_cipso_direct; | |
e114e473 | 231 | extern char *smack_net_ambient; |
15446235 | 232 | extern char *smack_onlycap; |
4303154e | 233 | extern const char *smack_cipso_option; |
e114e473 | 234 | |
e114e473 CS |
235 | extern struct smack_known smack_known_floor; |
236 | extern struct smack_known smack_known_hat; | |
237 | extern struct smack_known smack_known_huh; | |
238 | extern struct smack_known smack_known_invalid; | |
239 | extern struct smack_known smack_known_star; | |
6d3dc07c | 240 | extern struct smack_known smack_known_web; |
e114e473 | 241 | |
7198e2ee | 242 | extern struct list_head smack_known_list; |
7198e2ee EB |
243 | extern struct list_head smk_netlbladdr_list; |
244 | ||
076c54c5 | 245 | extern struct security_operations smack_ops; |
e114e473 CS |
246 | |
247 | /* | |
248 | * Stricly for CIPSO level manipulation. | |
249 | * Set the category bit number in a smack label sized buffer. | |
250 | */ | |
251 | static inline void smack_catset_bit(int cat, char *catsetp) | |
252 | { | |
253 | if (cat > SMK_LABELLEN * 8) | |
254 | return; | |
255 | ||
256 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
257 | } | |
258 | ||
5c6d1125 JS |
259 | /* |
260 | * Is the directory transmuting? | |
261 | */ | |
262 | static inline int smk_inode_transmutable(const struct inode *isp) | |
263 | { | |
264 | struct inode_smack *sip = isp->i_security; | |
265 | return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; | |
266 | } | |
267 | ||
e114e473 CS |
268 | /* |
269 | * Present a pointer to the smack label in an inode blob. | |
270 | */ | |
271 | static inline char *smk_of_inode(const struct inode *isp) | |
272 | { | |
273 | struct inode_smack *sip = isp->i_security; | |
274 | return sip->smk_inode; | |
275 | } | |
276 | ||
676dac4b CS |
277 | /* |
278 | * Present a pointer to the smack label in an task blob. | |
279 | */ | |
280 | static inline char *smk_of_task(const struct task_smack *tsp) | |
281 | { | |
282 | return tsp->smk_task; | |
283 | } | |
284 | ||
285 | /* | |
286 | * Present a pointer to the forked smack label in an task blob. | |
287 | */ | |
288 | static inline char *smk_of_forked(const struct task_smack *tsp) | |
289 | { | |
290 | return tsp->smk_forked; | |
291 | } | |
292 | ||
293 | /* | |
5c6d1125 | 294 | * Present a pointer to the smack label in the current task blob. |
676dac4b CS |
295 | */ |
296 | static inline char *smk_of_current(void) | |
297 | { | |
298 | return smk_of_task(current_security()); | |
299 | } | |
300 | ||
ecfcc53f EB |
301 | /* |
302 | * logging functions | |
303 | */ | |
304 | #define SMACK_AUDIT_DENIED 0x1 | |
305 | #define SMACK_AUDIT_ACCEPT 0x2 | |
306 | extern int log_policy; | |
307 | ||
308 | void smack_log(char *subject_label, char *object_label, | |
309 | int request, | |
310 | int result, struct smk_audit_info *auditdata); | |
311 | ||
312 | #ifdef CONFIG_AUDIT | |
313 | ||
314 | /* | |
315 | * some inline functions to set up audit data | |
316 | * they do nothing if CONFIG_AUDIT is not set | |
317 | * | |
318 | */ | |
319 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
320 | char type) | |
321 | { | |
322 | memset(a, 0, sizeof(*a)); | |
323 | a->a.type = type; | |
3b3b0e4f EP |
324 | a->a.smack_audit_data = &a->sad; |
325 | a->a.smack_audit_data->function = func; | |
ecfcc53f EB |
326 | } |
327 | ||
48c62af6 EP |
328 | static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func, |
329 | char type, struct lsm_network_audit *net) | |
330 | { | |
331 | smk_ad_init(a, func, type); | |
332 | memset(net, 0, sizeof(*net)); | |
333 | a->a.u.net = net; | |
334 | } | |
335 | ||
ecfcc53f EB |
336 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, |
337 | struct task_struct *t) | |
338 | { | |
339 | a->a.u.tsk = t; | |
340 | } | |
341 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
342 | struct dentry *d) | |
343 | { | |
a269434d | 344 | a->a.u.dentry = d; |
ecfcc53f EB |
345 | } |
346 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
347 | struct inode *i) | |
348 | { | |
f48b7399 | 349 | a->a.u.inode = i; |
ecfcc53f EB |
350 | } |
351 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
352 | struct path p) | |
353 | { | |
f48b7399 | 354 | a->a.u.path = p; |
ecfcc53f EB |
355 | } |
356 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
357 | struct sock *sk) | |
358 | { | |
48c62af6 | 359 | a->a.u.net->sk = sk; |
ecfcc53f EB |
360 | } |
361 | ||
362 | #else /* no AUDIT */ | |
363 | ||
364 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
365 | char type) | |
366 | { | |
367 | } | |
368 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
369 | struct task_struct *t) | |
370 | { | |
371 | } | |
372 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
373 | struct dentry *d) | |
374 | { | |
375 | } | |
376 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
377 | struct vfsmount *m) | |
378 | { | |
379 | } | |
380 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
381 | struct inode *i) | |
382 | { | |
383 | } | |
384 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
385 | struct path p) | |
386 | { | |
387 | } | |
388 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
389 | struct sock *sk) | |
390 | { | |
391 | } | |
392 | #endif | |
393 | ||
e114e473 | 394 | #endif /* _SECURITY_SMACK_H */ |