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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 | ||
2f823ff8 CS |
31 | /* |
32 | * This is the repository for labels seen so that it is | |
33 | * not necessary to keep allocating tiny chuncks of memory | |
34 | * and so that they can be shared. | |
35 | * | |
36 | * Labels are never modified in place. Anytime a label | |
37 | * is imported (e.g. xattrset on a file) the list is checked | |
38 | * for it and it is added if it doesn't exist. The address | |
39 | * is passed out in either case. Entries are added, but | |
40 | * never deleted. | |
41 | * | |
42 | * Since labels are hanging around anyway it doesn't | |
43 | * hurt to maintain a secid for those awkward situations | |
44 | * where kernel components that ought to use LSM independent | |
45 | * interfaces don't. The secid should go away when all of | |
46 | * these components have been repaired. | |
47 | * | |
48 | * The cipso value associated with the label gets stored here, too. | |
49 | * | |
50 | * Keep the access rules for this subject label here so that | |
51 | * the entire set of rules does not need to be examined every | |
52 | * time. | |
53 | */ | |
54 | struct smack_known { | |
55 | struct list_head list; | |
4d7cf4a1 | 56 | struct hlist_node smk_hashed; |
2f823ff8 CS |
57 | char *smk_known; |
58 | u32 smk_secid; | |
59 | struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */ | |
60 | struct list_head smk_rules; /* access rules */ | |
61 | struct mutex smk_rules_lock; /* lock for rules */ | |
62 | }; | |
63 | ||
f7112e6c CS |
64 | /* |
65 | * Maximum number of bytes for the levels in a CIPSO IP option. | |
e114e473 CS |
66 | * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is |
67 | * bigger than can be used, and 24 is the next lower multiple | |
68 | * of 8, and there are too many issues if there isn't space set | |
69 | * aside for the terminating null byte. | |
70 | */ | |
f7112e6c | 71 | #define SMK_CIPSOLEN 24 |
e114e473 | 72 | |
e114e473 CS |
73 | struct superblock_smack { |
74 | char *smk_root; | |
75 | char *smk_floor; | |
76 | char *smk_hat; | |
77 | char *smk_default; | |
78 | int smk_initialized; | |
e114e473 CS |
79 | }; |
80 | ||
81 | struct socket_smack { | |
2f823ff8 CS |
82 | struct smack_known *smk_out; /* outbound label */ |
83 | char *smk_in; /* inbound label */ | |
84 | char *smk_packet; /* TCP peer label */ | |
e114e473 CS |
85 | }; |
86 | ||
87 | /* | |
88 | * Inode smack data | |
89 | */ | |
90 | struct inode_smack { | |
2f823ff8 CS |
91 | char *smk_inode; /* label of the fso */ |
92 | struct smack_known *smk_task; /* label of the task */ | |
93 | struct smack_known *smk_mmap; /* label of the mmap domain */ | |
94 | struct mutex smk_lock; /* initialization lock */ | |
95 | int smk_flags; /* smack inode flags */ | |
e114e473 CS |
96 | }; |
97 | ||
676dac4b | 98 | struct task_smack { |
2f823ff8 CS |
99 | struct smack_known *smk_task; /* label for access control */ |
100 | struct smack_known *smk_forked; /* label when forked */ | |
7898e1f8 CS |
101 | struct list_head smk_rules; /* per task access rules */ |
102 | struct mutex smk_rules_lock; /* lock for the rules */ | |
676dac4b CS |
103 | }; |
104 | ||
e114e473 | 105 | #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ |
5c6d1125 | 106 | #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */ |
2267b13a | 107 | #define SMK_INODE_CHANGED 0x04 /* smack was transmuted */ |
e114e473 CS |
108 | |
109 | /* | |
110 | * A label access rule. | |
111 | */ | |
112 | struct smack_rule { | |
7198e2ee | 113 | struct list_head list; |
2f823ff8 | 114 | struct smack_known *smk_subject; |
7198e2ee EB |
115 | char *smk_object; |
116 | int smk_access; | |
e114e473 CS |
117 | }; |
118 | ||
6d3dc07c CS |
119 | /* |
120 | * An entry in the table identifying hosts. | |
121 | */ | |
122 | struct smk_netlbladdr { | |
7198e2ee | 123 | struct list_head list; |
6d3dc07c CS |
124 | struct sockaddr_in smk_host; /* network address */ |
125 | struct in_addr smk_mask; /* network mask */ | |
126 | char *smk_label; /* label */ | |
127 | }; | |
128 | ||
c6739443 CS |
129 | /* |
130 | * An entry in the table identifying ports. | |
131 | */ | |
132 | struct smk_port_label { | |
133 | struct list_head list; | |
134 | struct sock *smk_sock; /* socket initialized on */ | |
135 | unsigned short smk_port; /* the port number */ | |
136 | char *smk_in; /* incoming label */ | |
2f823ff8 | 137 | struct smack_known *smk_out; /* outgoing label */ |
e114e473 CS |
138 | }; |
139 | ||
140 | /* | |
141 | * Mount options | |
142 | */ | |
143 | #define SMK_FSDEFAULT "smackfsdef=" | |
144 | #define SMK_FSFLOOR "smackfsfloor=" | |
145 | #define SMK_FSHAT "smackfshat=" | |
146 | #define SMK_FSROOT "smackfsroot=" | |
e830b394 | 147 | #define SMK_FSTRANS "smackfstransmute=" |
e114e473 | 148 | |
4303154e EB |
149 | #define SMACK_CIPSO_OPTION "-CIPSO" |
150 | ||
e114e473 | 151 | /* |
6d3dc07c CS |
152 | * How communications on this socket are treated. |
153 | * Usually it's determined by the underlying netlabel code | |
154 | * but there are certain cases, including single label hosts | |
155 | * and potentially single label interfaces for which the | |
156 | * treatment can not be known in advance. | |
157 | * | |
158 | * The possibility of additional labeling schemes being | |
159 | * introduced in the future exists as well. | |
160 | */ | |
161 | #define SMACK_UNLABELED_SOCKET 0 | |
162 | #define SMACK_CIPSO_SOCKET 1 | |
163 | ||
e114e473 CS |
164 | /* |
165 | * CIPSO defaults. | |
166 | */ | |
167 | #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ | |
6d3dc07c | 168 | #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */ |
e114e473 | 169 | #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ |
f7112e6c | 170 | #define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */ |
e114e473 | 171 | #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ |
677264e8 CS |
172 | /* |
173 | * CIPSO 2.2 standard is 239, but Smack wants to use the | |
174 | * categories in a structured way that limits the value to | |
175 | * the bits in 23 bytes, hence the unusual number. | |
176 | */ | |
177 | #define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */ | |
e114e473 | 178 | |
5c6d1125 | 179 | /* |
c0ab6e56 CS |
180 | * Flags for untraditional access modes. |
181 | * It shouldn't be necessary to avoid conflicts with definitions | |
182 | * in fs.h, but do so anyway. | |
5c6d1125 | 183 | */ |
c0ab6e56 CS |
184 | #define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */ |
185 | #define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */ | |
186 | ||
e114e473 CS |
187 | /* |
188 | * Just to make the common cases easier to deal with | |
189 | */ | |
e114e473 | 190 | #define MAY_ANYREAD (MAY_READ | MAY_EXEC) |
e114e473 CS |
191 | #define MAY_READWRITE (MAY_READ | MAY_WRITE) |
192 | #define MAY_NOT 0 | |
193 | ||
ecfcc53f | 194 | /* |
c0ab6e56 | 195 | * Number of access types used by Smack (rwxatl) |
ecfcc53f | 196 | */ |
c0ab6e56 | 197 | #define SMK_NUM_ACCESS_TYPE 6 |
ecfcc53f | 198 | |
3b3b0e4f EP |
199 | /* SMACK data */ |
200 | struct smack_audit_data { | |
201 | const char *function; | |
202 | char *subject; | |
203 | char *object; | |
204 | char *request; | |
205 | int result; | |
206 | }; | |
207 | ||
ecfcc53f EB |
208 | /* |
209 | * Smack audit data; is empty if CONFIG_AUDIT not set | |
210 | * to save some stack | |
211 | */ | |
212 | struct smk_audit_info { | |
213 | #ifdef CONFIG_AUDIT | |
214 | struct common_audit_data a; | |
3b3b0e4f | 215 | struct smack_audit_data sad; |
ecfcc53f EB |
216 | #endif |
217 | }; | |
e114e473 CS |
218 | /* |
219 | * These functions are in smack_lsm.c | |
220 | */ | |
221 | struct inode_smack *new_inode_smack(char *); | |
222 | ||
223 | /* | |
224 | * These functions are in smack_access.c | |
225 | */ | |
7898e1f8 | 226 | int smk_access_entry(char *, char *, struct list_head *); |
2f823ff8 | 227 | int smk_access(struct smack_known *, char *, int, struct smk_audit_info *); |
959e6c7f | 228 | int smk_tskacc(struct task_smack *, char *, u32, struct smk_audit_info *); |
ecfcc53f | 229 | int smk_curacc(char *, u32, struct smk_audit_info *); |
2f823ff8 | 230 | struct smack_known *smack_from_secid(const u32); |
f7112e6c CS |
231 | char *smk_parse_smack(const char *string, int len); |
232 | int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int); | |
e114e473 CS |
233 | char *smk_import(const char *, int); |
234 | struct smack_known *smk_import_entry(const char *, int); | |
4d7cf4a1 | 235 | void smk_insert_entry(struct smack_known *skp); |
272cd7a8 | 236 | struct smack_known *smk_find_entry(const char *); |
e114e473 CS |
237 | u32 smack_to_secid(const char *); |
238 | ||
239 | /* | |
240 | * Shared data. | |
241 | */ | |
242 | extern int smack_cipso_direct; | |
f7112e6c | 243 | extern int smack_cipso_mapped; |
2f823ff8 | 244 | extern struct smack_known *smack_net_ambient; |
00f84f3f CS |
245 | extern struct smack_known *smack_onlycap; |
246 | extern struct smack_known *smack_syslog_label; | |
4303154e | 247 | extern const char *smack_cipso_option; |
e114e473 | 248 | |
e114e473 CS |
249 | extern struct smack_known smack_known_floor; |
250 | extern struct smack_known smack_known_hat; | |
251 | extern struct smack_known smack_known_huh; | |
252 | extern struct smack_known smack_known_invalid; | |
253 | extern struct smack_known smack_known_star; | |
6d3dc07c | 254 | extern struct smack_known smack_known_web; |
e114e473 | 255 | |
f7112e6c | 256 | extern struct mutex smack_known_lock; |
7198e2ee | 257 | extern struct list_head smack_known_list; |
7198e2ee EB |
258 | extern struct list_head smk_netlbladdr_list; |
259 | ||
076c54c5 | 260 | extern struct security_operations smack_ops; |
e114e473 | 261 | |
4d7cf4a1 TS |
262 | #define SMACK_HASH_SLOTS 16 |
263 | extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS]; | |
264 | ||
5c6d1125 JS |
265 | /* |
266 | * Is the directory transmuting? | |
267 | */ | |
268 | static inline int smk_inode_transmutable(const struct inode *isp) | |
269 | { | |
270 | struct inode_smack *sip = isp->i_security; | |
271 | return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; | |
272 | } | |
273 | ||
e114e473 CS |
274 | /* |
275 | * Present a pointer to the smack label in an inode blob. | |
276 | */ | |
277 | static inline char *smk_of_inode(const struct inode *isp) | |
278 | { | |
279 | struct inode_smack *sip = isp->i_security; | |
280 | return sip->smk_inode; | |
281 | } | |
282 | ||
676dac4b | 283 | /* |
2f823ff8 | 284 | * Present a pointer to the smack label entry in an task blob. |
676dac4b | 285 | */ |
2f823ff8 | 286 | static inline struct smack_known *smk_of_task(const struct task_smack *tsp) |
676dac4b CS |
287 | { |
288 | return tsp->smk_task; | |
289 | } | |
290 | ||
291 | /* | |
2f823ff8 | 292 | * Present a pointer to the forked smack label entry in an task blob. |
676dac4b | 293 | */ |
2f823ff8 | 294 | static inline struct smack_known *smk_of_forked(const struct task_smack *tsp) |
676dac4b CS |
295 | { |
296 | return tsp->smk_forked; | |
297 | } | |
298 | ||
299 | /* | |
5c6d1125 | 300 | * Present a pointer to the smack label in the current task blob. |
676dac4b | 301 | */ |
2f823ff8 | 302 | static inline struct smack_known *smk_of_current(void) |
676dac4b CS |
303 | { |
304 | return smk_of_task(current_security()); | |
305 | } | |
306 | ||
1880eff7 CS |
307 | /* |
308 | * Is the task privileged and allowed to be privileged | |
309 | * by the onlycap rule. | |
310 | */ | |
311 | static inline int smack_privileged(int cap) | |
312 | { | |
2f823ff8 CS |
313 | struct smack_known *skp = smk_of_current(); |
314 | ||
1880eff7 CS |
315 | if (!capable(cap)) |
316 | return 0; | |
00f84f3f | 317 | if (smack_onlycap == NULL || smack_onlycap == skp) |
1880eff7 CS |
318 | return 1; |
319 | return 0; | |
320 | } | |
321 | ||
ecfcc53f EB |
322 | /* |
323 | * logging functions | |
324 | */ | |
325 | #define SMACK_AUDIT_DENIED 0x1 | |
326 | #define SMACK_AUDIT_ACCEPT 0x2 | |
327 | extern int log_policy; | |
328 | ||
329 | void smack_log(char *subject_label, char *object_label, | |
330 | int request, | |
331 | int result, struct smk_audit_info *auditdata); | |
332 | ||
333 | #ifdef CONFIG_AUDIT | |
334 | ||
335 | /* | |
336 | * some inline functions to set up audit data | |
337 | * they do nothing if CONFIG_AUDIT is not set | |
338 | * | |
339 | */ | |
340 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
341 | char type) | |
342 | { | |
50c205f5 | 343 | memset(&a->sad, 0, sizeof(a->sad)); |
ecfcc53f | 344 | a->a.type = type; |
3b3b0e4f EP |
345 | a->a.smack_audit_data = &a->sad; |
346 | a->a.smack_audit_data->function = func; | |
ecfcc53f EB |
347 | } |
348 | ||
48c62af6 EP |
349 | static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func, |
350 | char type, struct lsm_network_audit *net) | |
351 | { | |
352 | smk_ad_init(a, func, type); | |
353 | memset(net, 0, sizeof(*net)); | |
354 | a->a.u.net = net; | |
355 | } | |
356 | ||
ecfcc53f EB |
357 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, |
358 | struct task_struct *t) | |
359 | { | |
360 | a->a.u.tsk = t; | |
361 | } | |
362 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
363 | struct dentry *d) | |
364 | { | |
a269434d | 365 | a->a.u.dentry = d; |
ecfcc53f EB |
366 | } |
367 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
368 | struct inode *i) | |
369 | { | |
f48b7399 | 370 | a->a.u.inode = i; |
ecfcc53f EB |
371 | } |
372 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
373 | struct path p) | |
374 | { | |
f48b7399 | 375 | a->a.u.path = p; |
ecfcc53f EB |
376 | } |
377 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
378 | struct sock *sk) | |
379 | { | |
48c62af6 | 380 | a->a.u.net->sk = sk; |
ecfcc53f EB |
381 | } |
382 | ||
383 | #else /* no AUDIT */ | |
384 | ||
385 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
386 | char type) | |
387 | { | |
388 | } | |
389 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
390 | struct task_struct *t) | |
391 | { | |
392 | } | |
393 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
394 | struct dentry *d) | |
395 | { | |
396 | } | |
397 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
398 | struct vfsmount *m) | |
399 | { | |
400 | } | |
401 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
402 | struct inode *i) | |
403 | { | |
404 | } | |
405 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
406 | struct path p) | |
407 | { | |
408 | } | |
409 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
410 | struct sock *sk) | |
411 | { | |
412 | } | |
413 | #endif | |
414 | ||
e114e473 | 415 | #endif /* _SECURITY_SMACK_H */ |