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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 */ |
e114e473 CS |
55 | struct mutex smk_lock; /* initialization lock */ |
56 | int smk_flags; /* smack inode flags */ | |
57 | }; | |
58 | ||
676dac4b CS |
59 | struct task_smack { |
60 | char *smk_task; /* label used for access control */ | |
61 | char *smk_forked; /* label when forked */ | |
62 | }; | |
63 | ||
e114e473 | 64 | #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ |
5c6d1125 | 65 | #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */ |
e114e473 CS |
66 | |
67 | /* | |
68 | * A label access rule. | |
69 | */ | |
70 | struct smack_rule { | |
7198e2ee EB |
71 | struct list_head list; |
72 | char *smk_subject; | |
73 | char *smk_object; | |
74 | int smk_access; | |
e114e473 CS |
75 | }; |
76 | ||
77 | /* | |
78 | * An entry in the table mapping smack values to | |
79 | * CIPSO level/category-set values. | |
80 | */ | |
81 | struct smack_cipso { | |
82 | int smk_level; | |
83 | char smk_catset[SMK_LABELLEN]; | |
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 | * | |
113 | * If there is a cipso value associated with the label it | |
114 | * gets stored here, too. This will most likely be rare as | |
115 | * the cipso direct mapping in used internally. | |
116 | */ | |
117 | struct smack_known { | |
7198e2ee | 118 | struct list_head list; |
e114e473 CS |
119 | char smk_known[SMK_LABELLEN]; |
120 | u32 smk_secid; | |
121 | struct smack_cipso *smk_cipso; | |
122 | spinlock_t smk_cipsolock; /* for changing cipso map */ | |
123 | }; | |
124 | ||
125 | /* | |
126 | * Mount options | |
127 | */ | |
128 | #define SMK_FSDEFAULT "smackfsdef=" | |
129 | #define SMK_FSFLOOR "smackfsfloor=" | |
130 | #define SMK_FSHAT "smackfshat=" | |
131 | #define SMK_FSROOT "smackfsroot=" | |
132 | ||
4303154e EB |
133 | #define SMACK_CIPSO_OPTION "-CIPSO" |
134 | ||
e114e473 | 135 | /* |
6d3dc07c CS |
136 | * How communications on this socket are treated. |
137 | * Usually it's determined by the underlying netlabel code | |
138 | * but there are certain cases, including single label hosts | |
139 | * and potentially single label interfaces for which the | |
140 | * treatment can not be known in advance. | |
141 | * | |
142 | * The possibility of additional labeling schemes being | |
143 | * introduced in the future exists as well. | |
144 | */ | |
145 | #define SMACK_UNLABELED_SOCKET 0 | |
146 | #define SMACK_CIPSO_SOCKET 1 | |
147 | ||
148 | /* | |
149 | * smackfs magic number | |
e114e473 CS |
150 | * smackfs macic number |
151 | */ | |
152 | #define SMACK_MAGIC 0x43415d53 /* "SMAC" */ | |
153 | ||
154 | /* | |
155 | * A limit on the number of entries in the lists | |
156 | * makes some of the list administration easier. | |
157 | */ | |
158 | #define SMACK_LIST_MAX 10000 | |
159 | ||
160 | /* | |
161 | * CIPSO defaults. | |
162 | */ | |
163 | #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ | |
6d3dc07c | 164 | #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */ |
e114e473 CS |
165 | #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ |
166 | #define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */ | |
167 | #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ | |
168 | #define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */ | |
169 | ||
5c6d1125 JS |
170 | /* |
171 | * Flag for transmute access | |
172 | */ | |
173 | #define MAY_TRANSMUTE 64 | |
e114e473 CS |
174 | /* |
175 | * Just to make the common cases easier to deal with | |
176 | */ | |
177 | #define MAY_ANY (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC) | |
178 | #define MAY_ANYREAD (MAY_READ | MAY_EXEC) | |
179 | #define MAY_ANYWRITE (MAY_WRITE | MAY_APPEND) | |
180 | #define MAY_READWRITE (MAY_READ | MAY_WRITE) | |
181 | #define MAY_NOT 0 | |
182 | ||
ecfcc53f EB |
183 | /* |
184 | * Number of access types used by Smack (rwxa) | |
185 | */ | |
186 | #define SMK_NUM_ACCESS_TYPE 4 | |
187 | ||
188 | /* | |
189 | * Smack audit data; is empty if CONFIG_AUDIT not set | |
190 | * to save some stack | |
191 | */ | |
192 | struct smk_audit_info { | |
193 | #ifdef CONFIG_AUDIT | |
194 | struct common_audit_data a; | |
195 | #endif | |
196 | }; | |
e114e473 CS |
197 | /* |
198 | * These functions are in smack_lsm.c | |
199 | */ | |
200 | struct inode_smack *new_inode_smack(char *); | |
201 | ||
202 | /* | |
203 | * These functions are in smack_access.c | |
204 | */ | |
5c6d1125 | 205 | int smk_access_entry(char *, char *); |
ecfcc53f EB |
206 | int smk_access(char *, char *, int, struct smk_audit_info *); |
207 | int smk_curacc(char *, u32, struct smk_audit_info *); | |
e114e473 CS |
208 | int smack_to_cipso(const char *, struct smack_cipso *); |
209 | void smack_from_cipso(u32, char *, char *); | |
210 | char *smack_from_secid(const u32); | |
211 | char *smk_import(const char *, int); | |
212 | struct smack_known *smk_import_entry(const char *, int); | |
213 | u32 smack_to_secid(const char *); | |
214 | ||
215 | /* | |
216 | * Shared data. | |
217 | */ | |
218 | extern int smack_cipso_direct; | |
e114e473 | 219 | extern char *smack_net_ambient; |
15446235 | 220 | extern char *smack_onlycap; |
4303154e | 221 | extern const char *smack_cipso_option; |
e114e473 | 222 | |
e114e473 CS |
223 | extern struct smack_known smack_known_floor; |
224 | extern struct smack_known smack_known_hat; | |
225 | extern struct smack_known smack_known_huh; | |
226 | extern struct smack_known smack_known_invalid; | |
227 | extern struct smack_known smack_known_star; | |
6d3dc07c | 228 | extern struct smack_known smack_known_web; |
e114e473 | 229 | |
7198e2ee EB |
230 | extern struct list_head smack_known_list; |
231 | extern struct list_head smack_rule_list; | |
232 | extern struct list_head smk_netlbladdr_list; | |
233 | ||
076c54c5 | 234 | extern struct security_operations smack_ops; |
e114e473 CS |
235 | |
236 | /* | |
237 | * Stricly for CIPSO level manipulation. | |
238 | * Set the category bit number in a smack label sized buffer. | |
239 | */ | |
240 | static inline void smack_catset_bit(int cat, char *catsetp) | |
241 | { | |
242 | if (cat > SMK_LABELLEN * 8) | |
243 | return; | |
244 | ||
245 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
246 | } | |
247 | ||
5c6d1125 JS |
248 | /* |
249 | * Is the directory transmuting? | |
250 | */ | |
251 | static inline int smk_inode_transmutable(const struct inode *isp) | |
252 | { | |
253 | struct inode_smack *sip = isp->i_security; | |
254 | return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; | |
255 | } | |
256 | ||
e114e473 CS |
257 | /* |
258 | * Present a pointer to the smack label in an inode blob. | |
259 | */ | |
260 | static inline char *smk_of_inode(const struct inode *isp) | |
261 | { | |
262 | struct inode_smack *sip = isp->i_security; | |
263 | return sip->smk_inode; | |
264 | } | |
265 | ||
676dac4b CS |
266 | /* |
267 | * Present a pointer to the smack label in an task blob. | |
268 | */ | |
269 | static inline char *smk_of_task(const struct task_smack *tsp) | |
270 | { | |
271 | return tsp->smk_task; | |
272 | } | |
273 | ||
274 | /* | |
275 | * Present a pointer to the forked smack label in an task blob. | |
276 | */ | |
277 | static inline char *smk_of_forked(const struct task_smack *tsp) | |
278 | { | |
279 | return tsp->smk_forked; | |
280 | } | |
281 | ||
282 | /* | |
5c6d1125 | 283 | * Present a pointer to the smack label in the current task blob. |
676dac4b CS |
284 | */ |
285 | static inline char *smk_of_current(void) | |
286 | { | |
287 | return smk_of_task(current_security()); | |
288 | } | |
289 | ||
ecfcc53f EB |
290 | /* |
291 | * logging functions | |
292 | */ | |
293 | #define SMACK_AUDIT_DENIED 0x1 | |
294 | #define SMACK_AUDIT_ACCEPT 0x2 | |
295 | extern int log_policy; | |
296 | ||
297 | void smack_log(char *subject_label, char *object_label, | |
298 | int request, | |
299 | int result, struct smk_audit_info *auditdata); | |
300 | ||
301 | #ifdef CONFIG_AUDIT | |
302 | ||
303 | /* | |
304 | * some inline functions to set up audit data | |
305 | * they do nothing if CONFIG_AUDIT is not set | |
306 | * | |
307 | */ | |
308 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
309 | char type) | |
310 | { | |
311 | memset(a, 0, sizeof(*a)); | |
312 | a->a.type = type; | |
d4131ded | 313 | a->a.smack_audit_data.function = func; |
ecfcc53f EB |
314 | } |
315 | ||
316 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
317 | struct task_struct *t) | |
318 | { | |
319 | a->a.u.tsk = t; | |
320 | } | |
321 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
322 | struct dentry *d) | |
323 | { | |
324 | a->a.u.fs.path.dentry = d; | |
325 | } | |
326 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
327 | struct vfsmount *m) | |
328 | { | |
329 | a->a.u.fs.path.mnt = m; | |
330 | } | |
331 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
332 | struct inode *i) | |
333 | { | |
334 | a->a.u.fs.inode = i; | |
335 | } | |
336 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
337 | struct path p) | |
338 | { | |
339 | a->a.u.fs.path = p; | |
340 | } | |
341 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
342 | struct sock *sk) | |
343 | { | |
344 | a->a.u.net.sk = sk; | |
345 | } | |
346 | ||
347 | #else /* no AUDIT */ | |
348 | ||
349 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
350 | char type) | |
351 | { | |
352 | } | |
353 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
354 | struct task_struct *t) | |
355 | { | |
356 | } | |
357 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
358 | struct dentry *d) | |
359 | { | |
360 | } | |
361 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
362 | struct vfsmount *m) | |
363 | { | |
364 | } | |
365 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
366 | struct inode *i) | |
367 | { | |
368 | } | |
369 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
370 | struct path p) | |
371 | { | |
372 | } | |
373 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
374 | struct sock *sk) | |
375 | { | |
376 | } | |
377 | #endif | |
378 | ||
e114e473 | 379 | #endif /* _SECURITY_SMACK_H */ |