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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 | 73 | struct superblock_smack { |
21c7eae2 LP |
74 | struct smack_known *smk_root; |
75 | struct smack_known *smk_floor; | |
76 | struct smack_known *smk_hat; | |
77 | struct smack_known *smk_default; | |
78 | int smk_initialized; | |
e114e473 CS |
79 | }; |
80 | ||
81 | struct socket_smack { | |
2f823ff8 | 82 | struct smack_known *smk_out; /* outbound label */ |
54e70ec5 CS |
83 | struct smack_known *smk_in; /* inbound label */ |
84 | struct smack_known *smk_packet; /* TCP peer label */ | |
e114e473 CS |
85 | }; |
86 | ||
87 | /* | |
88 | * Inode smack data | |
89 | */ | |
90 | struct inode_smack { | |
21c7eae2 | 91 | struct smack_known *smk_inode; /* label of the fso */ |
2f823ff8 CS |
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; |
21c7eae2 | 115 | struct smack_known *smk_object; |
7198e2ee | 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 */ | |
21c7eae2 | 126 | struct smack_known *smk_label; /* label */ |
6d3dc07c CS |
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 */ | |
54e70ec5 | 136 | struct smack_known *smk_in; /* inbound 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 | |
66867818 LP |
179 | /* |
180 | * Ptrace rules | |
181 | */ | |
182 | #define SMACK_PTRACE_DEFAULT 0 | |
183 | #define SMACK_PTRACE_EXACT 1 | |
184 | #define SMACK_PTRACE_DRACONIAN 2 | |
185 | #define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN | |
186 | ||
5c6d1125 | 187 | /* |
c0ab6e56 CS |
188 | * Flags for untraditional access modes. |
189 | * It shouldn't be necessary to avoid conflicts with definitions | |
190 | * in fs.h, but do so anyway. | |
5c6d1125 | 191 | */ |
c0ab6e56 CS |
192 | #define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */ |
193 | #define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */ | |
d166c802 | 194 | #define MAY_BRINGUP 0x00004000 /* Report use of this rule */ |
c0ab6e56 | 195 | |
e114e473 CS |
196 | /* |
197 | * Just to make the common cases easier to deal with | |
198 | */ | |
e114e473 | 199 | #define MAY_ANYREAD (MAY_READ | MAY_EXEC) |
e114e473 CS |
200 | #define MAY_READWRITE (MAY_READ | MAY_WRITE) |
201 | #define MAY_NOT 0 | |
202 | ||
ecfcc53f | 203 | /* |
d166c802 | 204 | * Number of access types used by Smack (rwxatlb) |
ecfcc53f | 205 | */ |
d166c802 | 206 | #define SMK_NUM_ACCESS_TYPE 7 |
ecfcc53f | 207 | |
3b3b0e4f EP |
208 | /* SMACK data */ |
209 | struct smack_audit_data { | |
210 | const char *function; | |
211 | char *subject; | |
212 | char *object; | |
213 | char *request; | |
214 | int result; | |
215 | }; | |
216 | ||
ecfcc53f EB |
217 | /* |
218 | * Smack audit data; is empty if CONFIG_AUDIT not set | |
219 | * to save some stack | |
220 | */ | |
221 | struct smk_audit_info { | |
222 | #ifdef CONFIG_AUDIT | |
223 | struct common_audit_data a; | |
3b3b0e4f | 224 | struct smack_audit_data sad; |
ecfcc53f EB |
225 | #endif |
226 | }; | |
e114e473 CS |
227 | /* |
228 | * These functions are in smack_lsm.c | |
229 | */ | |
21c7eae2 | 230 | struct inode_smack *new_inode_smack(struct smack_known *); |
e114e473 CS |
231 | |
232 | /* | |
233 | * These functions are in smack_access.c | |
234 | */ | |
7898e1f8 | 235 | int smk_access_entry(char *, char *, struct list_head *); |
21c7eae2 LP |
236 | int smk_access(struct smack_known *, struct smack_known *, |
237 | int, struct smk_audit_info *); | |
238 | int smk_tskacc(struct task_smack *, struct smack_known *, | |
239 | u32, struct smk_audit_info *); | |
240 | int smk_curacc(struct smack_known *, u32, struct smk_audit_info *); | |
2f823ff8 | 241 | struct smack_known *smack_from_secid(const u32); |
f7112e6c CS |
242 | char *smk_parse_smack(const char *string, int len); |
243 | int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int); | |
e114e473 | 244 | struct smack_known *smk_import_entry(const char *, int); |
4d7cf4a1 | 245 | void smk_insert_entry(struct smack_known *skp); |
272cd7a8 | 246 | struct smack_known *smk_find_entry(const char *); |
e114e473 CS |
247 | |
248 | /* | |
249 | * Shared data. | |
250 | */ | |
69f287ae | 251 | extern int smack_enabled; |
e114e473 | 252 | extern int smack_cipso_direct; |
f7112e6c | 253 | extern int smack_cipso_mapped; |
2f823ff8 | 254 | extern struct smack_known *smack_net_ambient; |
00f84f3f CS |
255 | extern struct smack_known *smack_onlycap; |
256 | extern struct smack_known *smack_syslog_label; | |
21c7eae2 | 257 | extern struct smack_known smack_cipso_option; |
66867818 | 258 | extern int smack_ptrace_rule; |
e114e473 | 259 | |
e114e473 CS |
260 | extern struct smack_known smack_known_floor; |
261 | extern struct smack_known smack_known_hat; | |
262 | extern struct smack_known smack_known_huh; | |
263 | extern struct smack_known smack_known_invalid; | |
264 | extern struct smack_known smack_known_star; | |
6d3dc07c | 265 | extern struct smack_known smack_known_web; |
e114e473 | 266 | |
f7112e6c | 267 | extern struct mutex smack_known_lock; |
7198e2ee | 268 | extern struct list_head smack_known_list; |
7198e2ee EB |
269 | extern struct list_head smk_netlbladdr_list; |
270 | ||
076c54c5 | 271 | extern struct security_operations smack_ops; |
e114e473 | 272 | |
4d7cf4a1 TS |
273 | #define SMACK_HASH_SLOTS 16 |
274 | extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS]; | |
275 | ||
5c6d1125 JS |
276 | /* |
277 | * Is the directory transmuting? | |
278 | */ | |
279 | static inline int smk_inode_transmutable(const struct inode *isp) | |
280 | { | |
281 | struct inode_smack *sip = isp->i_security; | |
282 | return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; | |
283 | } | |
284 | ||
e114e473 | 285 | /* |
21c7eae2 | 286 | * Present a pointer to the smack label entry in an inode blob. |
e114e473 | 287 | */ |
21c7eae2 | 288 | static inline struct smack_known *smk_of_inode(const struct inode *isp) |
e114e473 CS |
289 | { |
290 | struct inode_smack *sip = isp->i_security; | |
291 | return sip->smk_inode; | |
292 | } | |
293 | ||
676dac4b | 294 | /* |
2f823ff8 | 295 | * Present a pointer to the smack label entry in an task blob. |
676dac4b | 296 | */ |
2f823ff8 | 297 | static inline struct smack_known *smk_of_task(const struct task_smack *tsp) |
676dac4b CS |
298 | { |
299 | return tsp->smk_task; | |
300 | } | |
301 | ||
6d1cff2a AR |
302 | static inline struct smack_known *smk_of_task_struct(const struct task_struct *t) |
303 | { | |
304 | struct smack_known *skp; | |
305 | ||
306 | rcu_read_lock(); | |
307 | skp = smk_of_task(__task_cred(t)->security); | |
308 | rcu_read_unlock(); | |
309 | return skp; | |
310 | } | |
311 | ||
676dac4b | 312 | /* |
2f823ff8 | 313 | * Present a pointer to the forked smack label entry in an task blob. |
676dac4b | 314 | */ |
2f823ff8 | 315 | static inline struct smack_known *smk_of_forked(const struct task_smack *tsp) |
676dac4b CS |
316 | { |
317 | return tsp->smk_forked; | |
318 | } | |
319 | ||
320 | /* | |
5c6d1125 | 321 | * Present a pointer to the smack label in the current task blob. |
676dac4b | 322 | */ |
2f823ff8 | 323 | static inline struct smack_known *smk_of_current(void) |
676dac4b CS |
324 | { |
325 | return smk_of_task(current_security()); | |
326 | } | |
327 | ||
1880eff7 CS |
328 | /* |
329 | * Is the task privileged and allowed to be privileged | |
330 | * by the onlycap rule. | |
331 | */ | |
332 | static inline int smack_privileged(int cap) | |
333 | { | |
2f823ff8 CS |
334 | struct smack_known *skp = smk_of_current(); |
335 | ||
1880eff7 CS |
336 | if (!capable(cap)) |
337 | return 0; | |
00f84f3f | 338 | if (smack_onlycap == NULL || smack_onlycap == skp) |
1880eff7 CS |
339 | return 1; |
340 | return 0; | |
341 | } | |
342 | ||
ecfcc53f EB |
343 | /* |
344 | * logging functions | |
345 | */ | |
346 | #define SMACK_AUDIT_DENIED 0x1 | |
347 | #define SMACK_AUDIT_ACCEPT 0x2 | |
348 | extern int log_policy; | |
349 | ||
350 | void smack_log(char *subject_label, char *object_label, | |
351 | int request, | |
352 | int result, struct smk_audit_info *auditdata); | |
353 | ||
354 | #ifdef CONFIG_AUDIT | |
355 | ||
356 | /* | |
357 | * some inline functions to set up audit data | |
358 | * they do nothing if CONFIG_AUDIT is not set | |
359 | * | |
360 | */ | |
361 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
362 | char type) | |
363 | { | |
50c205f5 | 364 | memset(&a->sad, 0, sizeof(a->sad)); |
ecfcc53f | 365 | a->a.type = type; |
3b3b0e4f EP |
366 | a->a.smack_audit_data = &a->sad; |
367 | a->a.smack_audit_data->function = func; | |
ecfcc53f EB |
368 | } |
369 | ||
48c62af6 EP |
370 | static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func, |
371 | char type, struct lsm_network_audit *net) | |
372 | { | |
373 | smk_ad_init(a, func, type); | |
374 | memset(net, 0, sizeof(*net)); | |
375 | a->a.u.net = net; | |
376 | } | |
377 | ||
ecfcc53f EB |
378 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, |
379 | struct task_struct *t) | |
380 | { | |
381 | a->a.u.tsk = t; | |
382 | } | |
383 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
384 | struct dentry *d) | |
385 | { | |
a269434d | 386 | a->a.u.dentry = d; |
ecfcc53f EB |
387 | } |
388 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
389 | struct inode *i) | |
390 | { | |
f48b7399 | 391 | a->a.u.inode = i; |
ecfcc53f EB |
392 | } |
393 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
394 | struct path p) | |
395 | { | |
f48b7399 | 396 | a->a.u.path = p; |
ecfcc53f EB |
397 | } |
398 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
399 | struct sock *sk) | |
400 | { | |
48c62af6 | 401 | a->a.u.net->sk = sk; |
ecfcc53f EB |
402 | } |
403 | ||
404 | #else /* no AUDIT */ | |
405 | ||
406 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
407 | char type) | |
408 | { | |
409 | } | |
410 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
411 | struct task_struct *t) | |
412 | { | |
413 | } | |
414 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
415 | struct dentry *d) | |
416 | { | |
417 | } | |
418 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
419 | struct vfsmount *m) | |
420 | { | |
421 | } | |
422 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
423 | struct inode *i) | |
424 | { | |
425 | } | |
426 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
427 | struct path p) | |
428 | { | |
429 | } | |
430 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
431 | struct sock *sk) | |
432 | { | |
433 | } | |
434 | #endif | |
435 | ||
e114e473 | 436 | #endif /* _SECURITY_SMACK_H */ |