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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; | |
56 | char *smk_known; | |
57 | u32 smk_secid; | |
58 | struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */ | |
59 | struct list_head smk_rules; /* access rules */ | |
60 | struct mutex smk_rules_lock; /* lock for rules */ | |
61 | }; | |
62 | ||
f7112e6c CS |
63 | /* |
64 | * Maximum number of bytes for the levels in a CIPSO IP option. | |
e114e473 CS |
65 | * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is |
66 | * bigger than can be used, and 24 is the next lower multiple | |
67 | * of 8, and there are too many issues if there isn't space set | |
68 | * aside for the terminating null byte. | |
69 | */ | |
f7112e6c | 70 | #define SMK_CIPSOLEN 24 |
e114e473 | 71 | |
e114e473 CS |
72 | struct superblock_smack { |
73 | char *smk_root; | |
74 | char *smk_floor; | |
75 | char *smk_hat; | |
76 | char *smk_default; | |
77 | int smk_initialized; | |
e114e473 CS |
78 | }; |
79 | ||
80 | struct socket_smack { | |
2f823ff8 CS |
81 | struct smack_known *smk_out; /* outbound label */ |
82 | char *smk_in; /* inbound label */ | |
83 | char *smk_packet; /* TCP peer label */ | |
e114e473 CS |
84 | }; |
85 | ||
86 | /* | |
87 | * Inode smack data | |
88 | */ | |
89 | struct inode_smack { | |
2f823ff8 CS |
90 | char *smk_inode; /* label of the fso */ |
91 | struct smack_known *smk_task; /* label of the task */ | |
92 | struct smack_known *smk_mmap; /* label of the mmap domain */ | |
93 | struct mutex smk_lock; /* initialization lock */ | |
94 | int smk_flags; /* smack inode flags */ | |
e114e473 CS |
95 | }; |
96 | ||
676dac4b | 97 | struct task_smack { |
2f823ff8 CS |
98 | struct smack_known *smk_task; /* label for access control */ |
99 | struct smack_known *smk_forked; /* label when forked */ | |
7898e1f8 CS |
100 | struct list_head smk_rules; /* per task access rules */ |
101 | struct mutex smk_rules_lock; /* lock for the rules */ | |
676dac4b CS |
102 | }; |
103 | ||
e114e473 | 104 | #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ |
5c6d1125 | 105 | #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */ |
2267b13a | 106 | #define SMK_INODE_CHANGED 0x04 /* smack was transmuted */ |
e114e473 CS |
107 | |
108 | /* | |
109 | * A label access rule. | |
110 | */ | |
111 | struct smack_rule { | |
7198e2ee | 112 | struct list_head list; |
2f823ff8 | 113 | struct smack_known *smk_subject; |
7198e2ee EB |
114 | char *smk_object; |
115 | int smk_access; | |
e114e473 CS |
116 | }; |
117 | ||
6d3dc07c CS |
118 | /* |
119 | * An entry in the table identifying hosts. | |
120 | */ | |
121 | struct smk_netlbladdr { | |
7198e2ee | 122 | struct list_head list; |
6d3dc07c CS |
123 | struct sockaddr_in smk_host; /* network address */ |
124 | struct in_addr smk_mask; /* network mask */ | |
125 | char *smk_label; /* label */ | |
126 | }; | |
127 | ||
c6739443 CS |
128 | /* |
129 | * An entry in the table identifying ports. | |
130 | */ | |
131 | struct smk_port_label { | |
132 | struct list_head list; | |
133 | struct sock *smk_sock; /* socket initialized on */ | |
134 | unsigned short smk_port; /* the port number */ | |
135 | char *smk_in; /* incoming label */ | |
2f823ff8 | 136 | struct smack_known *smk_out; /* outgoing label */ |
e114e473 CS |
137 | }; |
138 | ||
139 | /* | |
140 | * Mount options | |
141 | */ | |
142 | #define SMK_FSDEFAULT "smackfsdef=" | |
143 | #define SMK_FSFLOOR "smackfsfloor=" | |
144 | #define SMK_FSHAT "smackfshat=" | |
145 | #define SMK_FSROOT "smackfsroot=" | |
e830b394 | 146 | #define SMK_FSTRANS "smackfstransmute=" |
e114e473 | 147 | |
4303154e EB |
148 | #define SMACK_CIPSO_OPTION "-CIPSO" |
149 | ||
e114e473 | 150 | /* |
6d3dc07c CS |
151 | * How communications on this socket are treated. |
152 | * Usually it's determined by the underlying netlabel code | |
153 | * but there are certain cases, including single label hosts | |
154 | * and potentially single label interfaces for which the | |
155 | * treatment can not be known in advance. | |
156 | * | |
157 | * The possibility of additional labeling schemes being | |
158 | * introduced in the future exists as well. | |
159 | */ | |
160 | #define SMACK_UNLABELED_SOCKET 0 | |
161 | #define SMACK_CIPSO_SOCKET 1 | |
162 | ||
e114e473 CS |
163 | /* |
164 | * CIPSO defaults. | |
165 | */ | |
166 | #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ | |
6d3dc07c | 167 | #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */ |
e114e473 | 168 | #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ |
f7112e6c | 169 | #define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */ |
e114e473 CS |
170 | #define SMACK_CIPSO_MAXCATVAL 63 /* Bigger gets harder */ |
171 | #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ | |
172 | #define SMACK_CIPSO_MAXCATNUM 239 /* CIPSO 2.2 standard */ | |
173 | ||
5c6d1125 JS |
174 | /* |
175 | * Flag for transmute access | |
176 | */ | |
177 | #define MAY_TRANSMUTE 64 | |
e114e473 CS |
178 | /* |
179 | * Just to make the common cases easier to deal with | |
180 | */ | |
e114e473 | 181 | #define MAY_ANYREAD (MAY_READ | MAY_EXEC) |
e114e473 CS |
182 | #define MAY_READWRITE (MAY_READ | MAY_WRITE) |
183 | #define MAY_NOT 0 | |
184 | ||
ecfcc53f | 185 | /* |
ce8a4321 | 186 | * Number of access types used by Smack (rwxat) |
ecfcc53f | 187 | */ |
ce8a4321 | 188 | #define SMK_NUM_ACCESS_TYPE 5 |
ecfcc53f | 189 | |
3b3b0e4f EP |
190 | /* SMACK data */ |
191 | struct smack_audit_data { | |
192 | const char *function; | |
193 | char *subject; | |
194 | char *object; | |
195 | char *request; | |
196 | int result; | |
197 | }; | |
198 | ||
ecfcc53f EB |
199 | /* |
200 | * Smack audit data; is empty if CONFIG_AUDIT not set | |
201 | * to save some stack | |
202 | */ | |
203 | struct smk_audit_info { | |
204 | #ifdef CONFIG_AUDIT | |
205 | struct common_audit_data a; | |
3b3b0e4f | 206 | struct smack_audit_data sad; |
ecfcc53f EB |
207 | #endif |
208 | }; | |
e114e473 CS |
209 | /* |
210 | * These functions are in smack_lsm.c | |
211 | */ | |
212 | struct inode_smack *new_inode_smack(char *); | |
213 | ||
214 | /* | |
215 | * These functions are in smack_access.c | |
216 | */ | |
7898e1f8 | 217 | int smk_access_entry(char *, char *, struct list_head *); |
2f823ff8 | 218 | int smk_access(struct smack_known *, char *, int, struct smk_audit_info *); |
ecfcc53f | 219 | int smk_curacc(char *, u32, struct smk_audit_info *); |
2f823ff8 | 220 | struct smack_known *smack_from_secid(const u32); |
f7112e6c CS |
221 | char *smk_parse_smack(const char *string, int len); |
222 | int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int); | |
e114e473 CS |
223 | char *smk_import(const char *, int); |
224 | struct smack_known *smk_import_entry(const char *, int); | |
272cd7a8 | 225 | struct smack_known *smk_find_entry(const char *); |
e114e473 CS |
226 | u32 smack_to_secid(const char *); |
227 | ||
228 | /* | |
229 | * Shared data. | |
230 | */ | |
231 | extern int smack_cipso_direct; | |
f7112e6c | 232 | extern int smack_cipso_mapped; |
2f823ff8 | 233 | extern struct smack_known *smack_net_ambient; |
15446235 | 234 | extern char *smack_onlycap; |
4303154e | 235 | extern const char *smack_cipso_option; |
e114e473 | 236 | |
e114e473 CS |
237 | extern struct smack_known smack_known_floor; |
238 | extern struct smack_known smack_known_hat; | |
239 | extern struct smack_known smack_known_huh; | |
240 | extern struct smack_known smack_known_invalid; | |
241 | extern struct smack_known smack_known_star; | |
6d3dc07c | 242 | extern struct smack_known smack_known_web; |
e114e473 | 243 | |
f7112e6c | 244 | extern struct mutex smack_known_lock; |
7198e2ee | 245 | extern struct list_head smack_known_list; |
7198e2ee EB |
246 | extern struct list_head smk_netlbladdr_list; |
247 | ||
076c54c5 | 248 | extern struct security_operations smack_ops; |
e114e473 | 249 | |
5c6d1125 JS |
250 | /* |
251 | * Is the directory transmuting? | |
252 | */ | |
253 | static inline int smk_inode_transmutable(const struct inode *isp) | |
254 | { | |
255 | struct inode_smack *sip = isp->i_security; | |
256 | return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; | |
257 | } | |
258 | ||
e114e473 CS |
259 | /* |
260 | * Present a pointer to the smack label in an inode blob. | |
261 | */ | |
262 | static inline char *smk_of_inode(const struct inode *isp) | |
263 | { | |
264 | struct inode_smack *sip = isp->i_security; | |
265 | return sip->smk_inode; | |
266 | } | |
267 | ||
676dac4b | 268 | /* |
2f823ff8 | 269 | * Present a pointer to the smack label entry in an task blob. |
676dac4b | 270 | */ |
2f823ff8 | 271 | static inline struct smack_known *smk_of_task(const struct task_smack *tsp) |
676dac4b CS |
272 | { |
273 | return tsp->smk_task; | |
274 | } | |
275 | ||
276 | /* | |
2f823ff8 | 277 | * Present a pointer to the forked smack label entry in an task blob. |
676dac4b | 278 | */ |
2f823ff8 | 279 | static inline struct smack_known *smk_of_forked(const struct task_smack *tsp) |
676dac4b CS |
280 | { |
281 | return tsp->smk_forked; | |
282 | } | |
283 | ||
284 | /* | |
5c6d1125 | 285 | * Present a pointer to the smack label in the current task blob. |
676dac4b | 286 | */ |
2f823ff8 | 287 | static inline struct smack_known *smk_of_current(void) |
676dac4b CS |
288 | { |
289 | return smk_of_task(current_security()); | |
290 | } | |
291 | ||
1880eff7 CS |
292 | /* |
293 | * Is the task privileged and allowed to be privileged | |
294 | * by the onlycap rule. | |
295 | */ | |
296 | static inline int smack_privileged(int cap) | |
297 | { | |
2f823ff8 CS |
298 | struct smack_known *skp = smk_of_current(); |
299 | ||
1880eff7 CS |
300 | if (!capable(cap)) |
301 | return 0; | |
2f823ff8 | 302 | if (smack_onlycap == NULL || smack_onlycap == skp->smk_known) |
1880eff7 CS |
303 | return 1; |
304 | return 0; | |
305 | } | |
306 | ||
ecfcc53f EB |
307 | /* |
308 | * logging functions | |
309 | */ | |
310 | #define SMACK_AUDIT_DENIED 0x1 | |
311 | #define SMACK_AUDIT_ACCEPT 0x2 | |
312 | extern int log_policy; | |
313 | ||
314 | void smack_log(char *subject_label, char *object_label, | |
315 | int request, | |
316 | int result, struct smk_audit_info *auditdata); | |
317 | ||
318 | #ifdef CONFIG_AUDIT | |
319 | ||
320 | /* | |
321 | * some inline functions to set up audit data | |
322 | * they do nothing if CONFIG_AUDIT is not set | |
323 | * | |
324 | */ | |
325 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
326 | char type) | |
327 | { | |
50c205f5 | 328 | memset(&a->sad, 0, sizeof(a->sad)); |
ecfcc53f | 329 | a->a.type = type; |
3b3b0e4f EP |
330 | a->a.smack_audit_data = &a->sad; |
331 | a->a.smack_audit_data->function = func; | |
ecfcc53f EB |
332 | } |
333 | ||
48c62af6 EP |
334 | static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func, |
335 | char type, struct lsm_network_audit *net) | |
336 | { | |
337 | smk_ad_init(a, func, type); | |
338 | memset(net, 0, sizeof(*net)); | |
339 | a->a.u.net = net; | |
340 | } | |
341 | ||
ecfcc53f EB |
342 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, |
343 | struct task_struct *t) | |
344 | { | |
345 | a->a.u.tsk = t; | |
346 | } | |
347 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
348 | struct dentry *d) | |
349 | { | |
a269434d | 350 | a->a.u.dentry = d; |
ecfcc53f EB |
351 | } |
352 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
353 | struct inode *i) | |
354 | { | |
f48b7399 | 355 | a->a.u.inode = i; |
ecfcc53f EB |
356 | } |
357 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
358 | struct path p) | |
359 | { | |
f48b7399 | 360 | a->a.u.path = p; |
ecfcc53f EB |
361 | } |
362 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
363 | struct sock *sk) | |
364 | { | |
48c62af6 | 365 | a->a.u.net->sk = sk; |
ecfcc53f EB |
366 | } |
367 | ||
368 | #else /* no AUDIT */ | |
369 | ||
370 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
371 | char type) | |
372 | { | |
373 | } | |
374 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
375 | struct task_struct *t) | |
376 | { | |
377 | } | |
378 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
379 | struct dentry *d) | |
380 | { | |
381 | } | |
382 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
383 | struct vfsmount *m) | |
384 | { | |
385 | } | |
386 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
387 | struct inode *i) | |
388 | { | |
389 | } | |
390 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
391 | struct path p) | |
392 | { | |
393 | } | |
394 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
395 | struct sock *sk) | |
396 | { | |
397 | } | |
398 | #endif | |
399 | ||
e114e473 | 400 | #endif /* _SECURITY_SMACK_H */ |