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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 | /* | |
f7112e6c CS |
26 | * Smack labels were limited to 23 characters for a long time. |
27 | */ | |
28 | #define SMK_LABELLEN 24 | |
29 | #define SMK_LONGLABEL 256 | |
30 | ||
31 | /* | |
32 | * Maximum number of bytes for the levels in a CIPSO IP option. | |
e114e473 CS |
33 | * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is |
34 | * bigger than can be used, and 24 is the next lower multiple | |
35 | * of 8, and there are too many issues if there isn't space set | |
36 | * aside for the terminating null byte. | |
37 | */ | |
f7112e6c | 38 | #define SMK_CIPSOLEN 24 |
e114e473 | 39 | |
e114e473 CS |
40 | struct superblock_smack { |
41 | char *smk_root; | |
42 | char *smk_floor; | |
43 | char *smk_hat; | |
44 | char *smk_default; | |
45 | int smk_initialized; | |
e114e473 CS |
46 | }; |
47 | ||
48 | struct socket_smack { | |
272cd7a8 CS |
49 | char *smk_out; /* outbound label */ |
50 | char *smk_in; /* inbound label */ | |
51 | char *smk_packet; /* TCP peer label */ | |
e114e473 CS |
52 | }; |
53 | ||
54 | /* | |
55 | * Inode smack data | |
56 | */ | |
57 | struct inode_smack { | |
58 | char *smk_inode; /* label of the fso */ | |
676dac4b | 59 | char *smk_task; /* label of the task */ |
7898e1f8 | 60 | char *smk_mmap; /* label of the mmap domain */ |
e114e473 CS |
61 | struct mutex smk_lock; /* initialization lock */ |
62 | int smk_flags; /* smack inode flags */ | |
63 | }; | |
64 | ||
676dac4b | 65 | struct task_smack { |
7898e1f8 CS |
66 | char *smk_task; /* label for access control */ |
67 | char *smk_forked; /* label when forked */ | |
68 | struct list_head smk_rules; /* per task access rules */ | |
69 | struct mutex smk_rules_lock; /* lock for the rules */ | |
676dac4b CS |
70 | }; |
71 | ||
e114e473 | 72 | #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ |
5c6d1125 | 73 | #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */ |
2267b13a | 74 | #define SMK_INODE_CHANGED 0x04 /* smack was transmuted */ |
e114e473 CS |
75 | |
76 | /* | |
77 | * A label access rule. | |
78 | */ | |
79 | struct smack_rule { | |
7198e2ee EB |
80 | struct list_head list; |
81 | char *smk_subject; | |
82 | char *smk_object; | |
83 | int smk_access; | |
e114e473 CS |
84 | }; |
85 | ||
6d3dc07c CS |
86 | /* |
87 | * An entry in the table identifying hosts. | |
88 | */ | |
89 | struct smk_netlbladdr { | |
7198e2ee | 90 | struct list_head list; |
6d3dc07c CS |
91 | struct sockaddr_in smk_host; /* network address */ |
92 | struct in_addr smk_mask; /* network mask */ | |
93 | char *smk_label; /* label */ | |
94 | }; | |
95 | ||
e114e473 CS |
96 | /* |
97 | * This is the repository for labels seen so that it is | |
98 | * not necessary to keep allocating tiny chuncks of memory | |
99 | * and so that they can be shared. | |
100 | * | |
101 | * Labels are never modified in place. Anytime a label | |
102 | * is imported (e.g. xattrset on a file) the list is checked | |
103 | * for it and it is added if it doesn't exist. The address | |
104 | * is passed out in either case. Entries are added, but | |
105 | * never deleted. | |
106 | * | |
107 | * Since labels are hanging around anyway it doesn't | |
108 | * hurt to maintain a secid for those awkward situations | |
109 | * where kernel components that ought to use LSM independent | |
110 | * interfaces don't. The secid should go away when all of | |
111 | * these components have been repaired. | |
112 | * | |
f7112e6c | 113 | * The cipso value associated with the label gets stored here, too. |
272cd7a8 CS |
114 | * |
115 | * Keep the access rules for this subject label here so that | |
116 | * the entire set of rules does not need to be examined every | |
117 | * time. | |
e114e473 CS |
118 | */ |
119 | struct smack_known { | |
f7112e6c CS |
120 | struct list_head list; |
121 | char *smk_known; | |
122 | u32 smk_secid; | |
123 | struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */ | |
124 | struct list_head smk_rules; /* access rules */ | |
125 | struct mutex smk_rules_lock; /* lock for rules */ | |
e114e473 CS |
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 | */ |
154 | #define SMACK_MAGIC 0x43415d53 /* "SMAC" */ | |
155 | ||
e114e473 CS |
156 | /* |
157 | * CIPSO defaults. | |
158 | */ | |
159 | #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ | |
6d3dc07c | 160 | #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */ |
e114e473 | 161 | #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ |
f7112e6c | 162 | #define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */ |
e114e473 CS |
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 | 178 | /* |
ce8a4321 | 179 | * Number of access types used by Smack (rwxat) |
ecfcc53f | 180 | */ |
ce8a4321 | 181 | #define SMK_NUM_ACCESS_TYPE 5 |
ecfcc53f | 182 | |
3b3b0e4f EP |
183 | /* SMACK data */ |
184 | struct smack_audit_data { | |
185 | const char *function; | |
186 | char *subject; | |
187 | char *object; | |
188 | char *request; | |
189 | int result; | |
190 | }; | |
191 | ||
ecfcc53f EB |
192 | /* |
193 | * Smack audit data; is empty if CONFIG_AUDIT not set | |
194 | * to save some stack | |
195 | */ | |
196 | struct smk_audit_info { | |
197 | #ifdef CONFIG_AUDIT | |
198 | struct common_audit_data a; | |
3b3b0e4f | 199 | struct smack_audit_data sad; |
ecfcc53f EB |
200 | #endif |
201 | }; | |
e114e473 CS |
202 | /* |
203 | * These functions are in smack_lsm.c | |
204 | */ | |
205 | struct inode_smack *new_inode_smack(char *); | |
206 | ||
207 | /* | |
208 | * These functions are in smack_access.c | |
209 | */ | |
7898e1f8 | 210 | int smk_access_entry(char *, char *, struct list_head *); |
ecfcc53f EB |
211 | int smk_access(char *, char *, int, struct smk_audit_info *); |
212 | int smk_curacc(char *, u32, struct smk_audit_info *); | |
e114e473 | 213 | char *smack_from_secid(const u32); |
f7112e6c CS |
214 | char *smk_parse_smack(const char *string, int len); |
215 | int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int); | |
e114e473 CS |
216 | char *smk_import(const char *, int); |
217 | struct smack_known *smk_import_entry(const char *, int); | |
272cd7a8 | 218 | struct smack_known *smk_find_entry(const char *); |
e114e473 CS |
219 | u32 smack_to_secid(const char *); |
220 | ||
221 | /* | |
222 | * Shared data. | |
223 | */ | |
224 | extern int smack_cipso_direct; | |
f7112e6c | 225 | extern int smack_cipso_mapped; |
e114e473 | 226 | extern char *smack_net_ambient; |
15446235 | 227 | extern char *smack_onlycap; |
4303154e | 228 | extern const char *smack_cipso_option; |
e114e473 | 229 | |
e114e473 CS |
230 | extern struct smack_known smack_known_floor; |
231 | extern struct smack_known smack_known_hat; | |
232 | extern struct smack_known smack_known_huh; | |
233 | extern struct smack_known smack_known_invalid; | |
234 | extern struct smack_known smack_known_star; | |
6d3dc07c | 235 | extern struct smack_known smack_known_web; |
e114e473 | 236 | |
f7112e6c | 237 | extern struct mutex smack_known_lock; |
7198e2ee | 238 | extern struct list_head smack_known_list; |
7198e2ee EB |
239 | extern struct list_head smk_netlbladdr_list; |
240 | ||
076c54c5 | 241 | extern struct security_operations smack_ops; |
e114e473 | 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 | ||
1880eff7 CS |
285 | /* |
286 | * Is the task privileged and allowed to be privileged | |
287 | * by the onlycap rule. | |
288 | */ | |
289 | static inline int smack_privileged(int cap) | |
290 | { | |
291 | if (!capable(cap)) | |
292 | return 0; | |
293 | if (smack_onlycap == NULL || smack_onlycap == smk_of_current()) | |
294 | return 1; | |
295 | return 0; | |
296 | } | |
297 | ||
ecfcc53f EB |
298 | /* |
299 | * logging functions | |
300 | */ | |
301 | #define SMACK_AUDIT_DENIED 0x1 | |
302 | #define SMACK_AUDIT_ACCEPT 0x2 | |
303 | extern int log_policy; | |
304 | ||
305 | void smack_log(char *subject_label, char *object_label, | |
306 | int request, | |
307 | int result, struct smk_audit_info *auditdata); | |
308 | ||
309 | #ifdef CONFIG_AUDIT | |
310 | ||
311 | /* | |
312 | * some inline functions to set up audit data | |
313 | * they do nothing if CONFIG_AUDIT is not set | |
314 | * | |
315 | */ | |
316 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
317 | char type) | |
318 | { | |
50c205f5 | 319 | memset(&a->sad, 0, sizeof(a->sad)); |
ecfcc53f | 320 | a->a.type = type; |
3b3b0e4f EP |
321 | a->a.smack_audit_data = &a->sad; |
322 | a->a.smack_audit_data->function = func; | |
ecfcc53f EB |
323 | } |
324 | ||
48c62af6 EP |
325 | static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func, |
326 | char type, struct lsm_network_audit *net) | |
327 | { | |
328 | smk_ad_init(a, func, type); | |
329 | memset(net, 0, sizeof(*net)); | |
330 | a->a.u.net = net; | |
331 | } | |
332 | ||
ecfcc53f EB |
333 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, |
334 | struct task_struct *t) | |
335 | { | |
336 | a->a.u.tsk = t; | |
337 | } | |
338 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
339 | struct dentry *d) | |
340 | { | |
a269434d | 341 | a->a.u.dentry = d; |
ecfcc53f EB |
342 | } |
343 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
344 | struct inode *i) | |
345 | { | |
f48b7399 | 346 | a->a.u.inode = i; |
ecfcc53f EB |
347 | } |
348 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
349 | struct path p) | |
350 | { | |
f48b7399 | 351 | a->a.u.path = p; |
ecfcc53f EB |
352 | } |
353 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
354 | struct sock *sk) | |
355 | { | |
48c62af6 | 356 | a->a.u.net->sk = sk; |
ecfcc53f EB |
357 | } |
358 | ||
359 | #else /* no AUDIT */ | |
360 | ||
361 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
362 | char type) | |
363 | { | |
364 | } | |
365 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
366 | struct task_struct *t) | |
367 | { | |
368 | } | |
369 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
370 | struct dentry *d) | |
371 | { | |
372 | } | |
373 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
374 | struct vfsmount *m) | |
375 | { | |
376 | } | |
377 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
378 | struct inode *i) | |
379 | { | |
380 | } | |
381 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
382 | struct path p) | |
383 | { | |
384 | } | |
385 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
386 | struct sock *sk) | |
387 | { | |
388 | } | |
389 | #endif | |
390 | ||
e114e473 | 391 | #endif /* _SECURITY_SMACK_H */ |