Commit | Line | Data |
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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> | |
3c4ed7bd | 18 | #include <linux/lsm_hooks.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 */ |
bf4b2fee | 108 | #define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */ |
e114e473 CS |
109 | |
110 | /* | |
111 | * A label access rule. | |
112 | */ | |
113 | struct smack_rule { | |
7198e2ee | 114 | struct list_head list; |
2f823ff8 | 115 | struct smack_known *smk_subject; |
21c7eae2 | 116 | struct smack_known *smk_object; |
7198e2ee | 117 | int smk_access; |
e114e473 CS |
118 | }; |
119 | ||
6d3dc07c CS |
120 | /* |
121 | * An entry in the table identifying hosts. | |
122 | */ | |
123 | struct smk_netlbladdr { | |
7198e2ee | 124 | struct list_head list; |
6d3dc07c CS |
125 | struct sockaddr_in smk_host; /* network address */ |
126 | struct in_addr smk_mask; /* network mask */ | |
21c7eae2 | 127 | struct smack_known *smk_label; /* label */ |
6d3dc07c CS |
128 | }; |
129 | ||
c6739443 CS |
130 | /* |
131 | * An entry in the table identifying ports. | |
132 | */ | |
133 | struct smk_port_label { | |
134 | struct list_head list; | |
135 | struct sock *smk_sock; /* socket initialized on */ | |
136 | unsigned short smk_port; /* the port number */ | |
54e70ec5 | 137 | struct smack_known *smk_in; /* inbound label */ |
2f823ff8 | 138 | struct smack_known *smk_out; /* outgoing label */ |
e114e473 CS |
139 | }; |
140 | ||
c0d77c88 RK |
141 | struct smack_onlycap { |
142 | struct list_head list; | |
143 | struct smack_known *smk_label; | |
144 | }; | |
145 | ||
3bf2789c VT |
146 | /* Super block security struct flags for mount options */ |
147 | #define FSDEFAULT_MNT 0x01 | |
148 | #define FSFLOOR_MNT 0x02 | |
149 | #define FSHAT_MNT 0x04 | |
150 | #define FSROOT_MNT 0x08 | |
151 | #define FSTRANS_MNT 0x10 | |
152 | ||
153 | #define NUM_SMK_MNT_OPTS 5 | |
154 | ||
155 | enum { | |
156 | Opt_error = -1, | |
157 | Opt_fsdefault = 1, | |
158 | Opt_fsfloor = 2, | |
159 | Opt_fshat = 3, | |
160 | Opt_fsroot = 4, | |
161 | Opt_fstransmute = 5, | |
162 | }; | |
163 | ||
e114e473 CS |
164 | /* |
165 | * Mount options | |
166 | */ | |
167 | #define SMK_FSDEFAULT "smackfsdef=" | |
168 | #define SMK_FSFLOOR "smackfsfloor=" | |
169 | #define SMK_FSHAT "smackfshat=" | |
170 | #define SMK_FSROOT "smackfsroot=" | |
e830b394 | 171 | #define SMK_FSTRANS "smackfstransmute=" |
e114e473 | 172 | |
4303154e EB |
173 | #define SMACK_CIPSO_OPTION "-CIPSO" |
174 | ||
e114e473 | 175 | /* |
6d3dc07c CS |
176 | * How communications on this socket are treated. |
177 | * Usually it's determined by the underlying netlabel code | |
178 | * but there are certain cases, including single label hosts | |
179 | * and potentially single label interfaces for which the | |
180 | * treatment can not be known in advance. | |
181 | * | |
182 | * The possibility of additional labeling schemes being | |
183 | * introduced in the future exists as well. | |
184 | */ | |
185 | #define SMACK_UNLABELED_SOCKET 0 | |
186 | #define SMACK_CIPSO_SOCKET 1 | |
187 | ||
e114e473 CS |
188 | /* |
189 | * CIPSO defaults. | |
190 | */ | |
191 | #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ | |
6d3dc07c | 192 | #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */ |
e114e473 | 193 | #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ |
f7112e6c | 194 | #define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */ |
e114e473 | 195 | #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ |
677264e8 CS |
196 | /* |
197 | * CIPSO 2.2 standard is 239, but Smack wants to use the | |
198 | * categories in a structured way that limits the value to | |
199 | * the bits in 23 bytes, hence the unusual number. | |
200 | */ | |
201 | #define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */ | |
e114e473 | 202 | |
66867818 LP |
203 | /* |
204 | * Ptrace rules | |
205 | */ | |
206 | #define SMACK_PTRACE_DEFAULT 0 | |
207 | #define SMACK_PTRACE_EXACT 1 | |
208 | #define SMACK_PTRACE_DRACONIAN 2 | |
209 | #define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN | |
210 | ||
5c6d1125 | 211 | /* |
c0ab6e56 CS |
212 | * Flags for untraditional access modes. |
213 | * It shouldn't be necessary to avoid conflicts with definitions | |
214 | * in fs.h, but do so anyway. | |
5c6d1125 | 215 | */ |
c0ab6e56 CS |
216 | #define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */ |
217 | #define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */ | |
d166c802 | 218 | #define MAY_BRINGUP 0x00004000 /* Report use of this rule */ |
c0ab6e56 | 219 | |
bf4b2fee CS |
220 | #define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */ |
221 | #define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */ | |
222 | #define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */ | |
223 | ||
e114e473 CS |
224 | /* |
225 | * Just to make the common cases easier to deal with | |
226 | */ | |
e114e473 | 227 | #define MAY_ANYREAD (MAY_READ | MAY_EXEC) |
e114e473 CS |
228 | #define MAY_READWRITE (MAY_READ | MAY_WRITE) |
229 | #define MAY_NOT 0 | |
230 | ||
ecfcc53f | 231 | /* |
d166c802 | 232 | * Number of access types used by Smack (rwxatlb) |
ecfcc53f | 233 | */ |
d166c802 | 234 | #define SMK_NUM_ACCESS_TYPE 7 |
ecfcc53f | 235 | |
3b3b0e4f EP |
236 | /* SMACK data */ |
237 | struct smack_audit_data { | |
238 | const char *function; | |
239 | char *subject; | |
240 | char *object; | |
241 | char *request; | |
242 | int result; | |
243 | }; | |
244 | ||
ecfcc53f EB |
245 | /* |
246 | * Smack audit data; is empty if CONFIG_AUDIT not set | |
247 | * to save some stack | |
248 | */ | |
249 | struct smk_audit_info { | |
250 | #ifdef CONFIG_AUDIT | |
251 | struct common_audit_data a; | |
3b3b0e4f | 252 | struct smack_audit_data sad; |
ecfcc53f EB |
253 | #endif |
254 | }; | |
e114e473 CS |
255 | /* |
256 | * These functions are in smack_lsm.c | |
257 | */ | |
21c7eae2 | 258 | struct inode_smack *new_inode_smack(struct smack_known *); |
e114e473 CS |
259 | |
260 | /* | |
261 | * These functions are in smack_access.c | |
262 | */ | |
7898e1f8 | 263 | int smk_access_entry(char *, char *, struct list_head *); |
21c7eae2 LP |
264 | int smk_access(struct smack_known *, struct smack_known *, |
265 | int, struct smk_audit_info *); | |
266 | int smk_tskacc(struct task_smack *, struct smack_known *, | |
267 | u32, struct smk_audit_info *); | |
268 | int smk_curacc(struct smack_known *, u32, struct smk_audit_info *); | |
2f823ff8 | 269 | struct smack_known *smack_from_secid(const u32); |
f7112e6c CS |
270 | char *smk_parse_smack(const char *string, int len); |
271 | int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int); | |
e114e473 | 272 | struct smack_known *smk_import_entry(const char *, int); |
4d7cf4a1 | 273 | void smk_insert_entry(struct smack_known *skp); |
272cd7a8 | 274 | struct smack_known *smk_find_entry(const char *); |
c0d77c88 | 275 | int smack_privileged(int cap); |
e114e473 CS |
276 | |
277 | /* | |
278 | * Shared data. | |
279 | */ | |
69f287ae | 280 | extern int smack_enabled; |
e114e473 | 281 | extern int smack_cipso_direct; |
f7112e6c | 282 | extern int smack_cipso_mapped; |
2f823ff8 | 283 | extern struct smack_known *smack_net_ambient; |
00f84f3f | 284 | extern struct smack_known *smack_syslog_label; |
bf4b2fee CS |
285 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
286 | extern struct smack_known *smack_unconfined; | |
287 | #endif | |
21c7eae2 | 288 | extern struct smack_known smack_cipso_option; |
66867818 | 289 | extern int smack_ptrace_rule; |
e114e473 | 290 | |
e114e473 CS |
291 | extern struct smack_known smack_known_floor; |
292 | extern struct smack_known smack_known_hat; | |
293 | extern struct smack_known smack_known_huh; | |
294 | extern struct smack_known smack_known_invalid; | |
295 | extern struct smack_known smack_known_star; | |
6d3dc07c | 296 | extern struct smack_known smack_known_web; |
e114e473 | 297 | |
f7112e6c | 298 | extern struct mutex smack_known_lock; |
7198e2ee | 299 | extern struct list_head smack_known_list; |
7198e2ee EB |
300 | extern struct list_head smk_netlbladdr_list; |
301 | ||
c0d77c88 RK |
302 | extern struct mutex smack_onlycap_lock; |
303 | extern struct list_head smack_onlycap_list; | |
304 | ||
4d7cf4a1 TS |
305 | #define SMACK_HASH_SLOTS 16 |
306 | extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS]; | |
307 | ||
5c6d1125 JS |
308 | /* |
309 | * Is the directory transmuting? | |
310 | */ | |
311 | static inline int smk_inode_transmutable(const struct inode *isp) | |
312 | { | |
313 | struct inode_smack *sip = isp->i_security; | |
314 | return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; | |
315 | } | |
316 | ||
e114e473 | 317 | /* |
21c7eae2 | 318 | * Present a pointer to the smack label entry in an inode blob. |
e114e473 | 319 | */ |
21c7eae2 | 320 | static inline struct smack_known *smk_of_inode(const struct inode *isp) |
e114e473 CS |
321 | { |
322 | struct inode_smack *sip = isp->i_security; | |
323 | return sip->smk_inode; | |
324 | } | |
325 | ||
676dac4b | 326 | /* |
2f823ff8 | 327 | * Present a pointer to the smack label entry in an task blob. |
676dac4b | 328 | */ |
2f823ff8 | 329 | static inline struct smack_known *smk_of_task(const struct task_smack *tsp) |
676dac4b CS |
330 | { |
331 | return tsp->smk_task; | |
332 | } | |
333 | ||
6d1cff2a AR |
334 | static inline struct smack_known *smk_of_task_struct(const struct task_struct *t) |
335 | { | |
336 | struct smack_known *skp; | |
337 | ||
338 | rcu_read_lock(); | |
339 | skp = smk_of_task(__task_cred(t)->security); | |
340 | rcu_read_unlock(); | |
341 | return skp; | |
342 | } | |
343 | ||
676dac4b | 344 | /* |
2f823ff8 | 345 | * Present a pointer to the forked smack label entry in an task blob. |
676dac4b | 346 | */ |
2f823ff8 | 347 | static inline struct smack_known *smk_of_forked(const struct task_smack *tsp) |
676dac4b CS |
348 | { |
349 | return tsp->smk_forked; | |
350 | } | |
351 | ||
352 | /* | |
5c6d1125 | 353 | * Present a pointer to the smack label in the current task blob. |
676dac4b | 354 | */ |
2f823ff8 | 355 | static inline struct smack_known *smk_of_current(void) |
676dac4b CS |
356 | { |
357 | return smk_of_task(current_security()); | |
358 | } | |
359 | ||
ecfcc53f EB |
360 | /* |
361 | * logging functions | |
362 | */ | |
363 | #define SMACK_AUDIT_DENIED 0x1 | |
364 | #define SMACK_AUDIT_ACCEPT 0x2 | |
365 | extern int log_policy; | |
366 | ||
367 | void smack_log(char *subject_label, char *object_label, | |
368 | int request, | |
369 | int result, struct smk_audit_info *auditdata); | |
370 | ||
371 | #ifdef CONFIG_AUDIT | |
372 | ||
373 | /* | |
374 | * some inline functions to set up audit data | |
375 | * they do nothing if CONFIG_AUDIT is not set | |
376 | * | |
377 | */ | |
378 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
379 | char type) | |
380 | { | |
50c205f5 | 381 | memset(&a->sad, 0, sizeof(a->sad)); |
ecfcc53f | 382 | a->a.type = type; |
3b3b0e4f EP |
383 | a->a.smack_audit_data = &a->sad; |
384 | a->a.smack_audit_data->function = func; | |
ecfcc53f EB |
385 | } |
386 | ||
48c62af6 EP |
387 | static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func, |
388 | char type, struct lsm_network_audit *net) | |
389 | { | |
390 | smk_ad_init(a, func, type); | |
391 | memset(net, 0, sizeof(*net)); | |
392 | a->a.u.net = net; | |
393 | } | |
394 | ||
ecfcc53f EB |
395 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, |
396 | struct task_struct *t) | |
397 | { | |
398 | a->a.u.tsk = t; | |
399 | } | |
400 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
401 | struct dentry *d) | |
402 | { | |
a269434d | 403 | a->a.u.dentry = d; |
ecfcc53f EB |
404 | } |
405 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
406 | struct inode *i) | |
407 | { | |
f48b7399 | 408 | a->a.u.inode = i; |
ecfcc53f EB |
409 | } |
410 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
411 | struct path p) | |
412 | { | |
f48b7399 | 413 | a->a.u.path = p; |
ecfcc53f EB |
414 | } |
415 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
416 | struct sock *sk) | |
417 | { | |
48c62af6 | 418 | a->a.u.net->sk = sk; |
ecfcc53f EB |
419 | } |
420 | ||
421 | #else /* no AUDIT */ | |
422 | ||
423 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
424 | char type) | |
425 | { | |
426 | } | |
427 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
428 | struct task_struct *t) | |
429 | { | |
430 | } | |
431 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
432 | struct dentry *d) | |
433 | { | |
434 | } | |
435 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
436 | struct vfsmount *m) | |
437 | { | |
438 | } | |
439 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
440 | struct inode *i) | |
441 | { | |
442 | } | |
443 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
444 | struct path p) | |
445 | { | |
446 | } | |
447 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
448 | struct sock *sk) | |
449 | { | |
450 | } | |
451 | #endif | |
452 | ||
e114e473 | 453 | #endif /* _SECURITY_SMACK_H */ |