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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> |
21abb1ec CS |
20 | #if IS_ENABLED(CONFIG_IPV6) |
21 | #include <linux/in6.h> | |
22 | #endif /* CONFIG_IPV6 */ | |
e114e473 | 23 | #include <net/netlabel.h> |
7198e2ee EB |
24 | #include <linux/list.h> |
25 | #include <linux/rculist.h> | |
ecfcc53f | 26 | #include <linux/lsm_audit.h> |
e114e473 | 27 | |
21abb1ec CS |
28 | /* |
29 | * Use IPv6 port labeling if IPv6 is enabled and secmarks | |
30 | * are not being used. | |
31 | */ | |
32 | #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER) | |
33 | #define SMACK_IPV6_PORT_LABELING 1 | |
34 | #endif | |
35 | ||
36 | #if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER) | |
37 | #define SMACK_IPV6_SECMARK_LABELING 1 | |
38 | #endif | |
39 | ||
e114e473 | 40 | /* |
f7112e6c CS |
41 | * Smack labels were limited to 23 characters for a long time. |
42 | */ | |
43 | #define SMK_LABELLEN 24 | |
44 | #define SMK_LONGLABEL 256 | |
45 | ||
2f823ff8 CS |
46 | /* |
47 | * This is the repository for labels seen so that it is | |
48 | * not necessary to keep allocating tiny chuncks of memory | |
49 | * and so that they can be shared. | |
50 | * | |
51 | * Labels are never modified in place. Anytime a label | |
52 | * is imported (e.g. xattrset on a file) the list is checked | |
53 | * for it and it is added if it doesn't exist. The address | |
54 | * is passed out in either case. Entries are added, but | |
55 | * never deleted. | |
56 | * | |
57 | * Since labels are hanging around anyway it doesn't | |
58 | * hurt to maintain a secid for those awkward situations | |
59 | * where kernel components that ought to use LSM independent | |
60 | * interfaces don't. The secid should go away when all of | |
61 | * these components have been repaired. | |
62 | * | |
63 | * The cipso value associated with the label gets stored here, too. | |
64 | * | |
65 | * Keep the access rules for this subject label here so that | |
66 | * the entire set of rules does not need to be examined every | |
67 | * time. | |
68 | */ | |
69 | struct smack_known { | |
70 | struct list_head list; | |
4d7cf4a1 | 71 | struct hlist_node smk_hashed; |
2f823ff8 CS |
72 | char *smk_known; |
73 | u32 smk_secid; | |
74 | struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */ | |
75 | struct list_head smk_rules; /* access rules */ | |
76 | struct mutex smk_rules_lock; /* lock for rules */ | |
77 | }; | |
78 | ||
f7112e6c CS |
79 | /* |
80 | * Maximum number of bytes for the levels in a CIPSO IP option. | |
e114e473 CS |
81 | * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is |
82 | * bigger than can be used, and 24 is the next lower multiple | |
83 | * of 8, and there are too many issues if there isn't space set | |
84 | * aside for the terminating null byte. | |
85 | */ | |
f7112e6c | 86 | #define SMK_CIPSOLEN 24 |
e114e473 | 87 | |
e114e473 | 88 | struct superblock_smack { |
21c7eae2 LP |
89 | struct smack_known *smk_root; |
90 | struct smack_known *smk_floor; | |
91 | struct smack_known *smk_hat; | |
92 | struct smack_known *smk_default; | |
9f50eda2 | 93 | int smk_flags; |
e114e473 CS |
94 | }; |
95 | ||
9f50eda2 SF |
96 | /* |
97 | * Superblock flags | |
98 | */ | |
99 | #define SMK_SB_INITIALIZED 0x01 | |
100 | #define SMK_SB_UNTRUSTED 0x02 | |
101 | ||
e114e473 | 102 | struct socket_smack { |
2f823ff8 | 103 | struct smack_known *smk_out; /* outbound label */ |
54e70ec5 CS |
104 | struct smack_known *smk_in; /* inbound label */ |
105 | struct smack_known *smk_packet; /* TCP peer label */ | |
e114e473 CS |
106 | }; |
107 | ||
108 | /* | |
109 | * Inode smack data | |
110 | */ | |
111 | struct inode_smack { | |
21c7eae2 | 112 | struct smack_known *smk_inode; /* label of the fso */ |
2f823ff8 CS |
113 | struct smack_known *smk_task; /* label of the task */ |
114 | struct smack_known *smk_mmap; /* label of the mmap domain */ | |
115 | struct mutex smk_lock; /* initialization lock */ | |
116 | int smk_flags; /* smack inode flags */ | |
e114e473 CS |
117 | }; |
118 | ||
676dac4b | 119 | struct task_smack { |
2f823ff8 CS |
120 | struct smack_known *smk_task; /* label for access control */ |
121 | struct smack_known *smk_forked; /* label when forked */ | |
7898e1f8 CS |
122 | struct list_head smk_rules; /* per task access rules */ |
123 | struct mutex smk_rules_lock; /* lock for the rules */ | |
38416e53 | 124 | struct list_head smk_relabel; /* transit allowed labels */ |
676dac4b CS |
125 | }; |
126 | ||
e114e473 | 127 | #define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ |
5c6d1125 | 128 | #define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */ |
2267b13a | 129 | #define SMK_INODE_CHANGED 0x04 /* smack was transmuted */ |
bf4b2fee | 130 | #define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */ |
e114e473 CS |
131 | |
132 | /* | |
133 | * A label access rule. | |
134 | */ | |
135 | struct smack_rule { | |
7198e2ee | 136 | struct list_head list; |
2f823ff8 | 137 | struct smack_known *smk_subject; |
21c7eae2 | 138 | struct smack_known *smk_object; |
7198e2ee | 139 | int smk_access; |
e114e473 CS |
140 | }; |
141 | ||
6d3dc07c | 142 | /* |
21abb1ec | 143 | * An entry in the table identifying IPv4 hosts. |
6d3dc07c | 144 | */ |
21abb1ec | 145 | struct smk_net4addr { |
7198e2ee | 146 | struct list_head list; |
21abb1ec | 147 | struct in_addr smk_host; /* network address */ |
6d3dc07c | 148 | struct in_addr smk_mask; /* network mask */ |
21abb1ec CS |
149 | int smk_masks; /* mask size */ |
150 | struct smack_known *smk_label; /* label */ | |
151 | }; | |
152 | ||
153 | #if IS_ENABLED(CONFIG_IPV6) | |
154 | /* | |
155 | * An entry in the table identifying IPv6 hosts. | |
156 | */ | |
157 | struct smk_net6addr { | |
158 | struct list_head list; | |
159 | struct in6_addr smk_host; /* network address */ | |
160 | struct in6_addr smk_mask; /* network mask */ | |
161 | int smk_masks; /* mask size */ | |
21c7eae2 | 162 | struct smack_known *smk_label; /* label */ |
6d3dc07c | 163 | }; |
21abb1ec | 164 | #endif /* CONFIG_IPV6 */ |
6d3dc07c | 165 | |
21abb1ec | 166 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
167 | /* |
168 | * An entry in the table identifying ports. | |
169 | */ | |
170 | struct smk_port_label { | |
171 | struct list_head list; | |
172 | struct sock *smk_sock; /* socket initialized on */ | |
173 | unsigned short smk_port; /* the port number */ | |
54e70ec5 | 174 | struct smack_known *smk_in; /* inbound label */ |
2f823ff8 | 175 | struct smack_known *smk_out; /* outgoing label */ |
e114e473 | 176 | }; |
21abb1ec | 177 | #endif /* SMACK_IPV6_PORT_LABELING */ |
e114e473 | 178 | |
38416e53 | 179 | struct smack_known_list_elem { |
c0d77c88 RK |
180 | struct list_head list; |
181 | struct smack_known *smk_label; | |
182 | }; | |
183 | ||
3bf2789c VT |
184 | /* Super block security struct flags for mount options */ |
185 | #define FSDEFAULT_MNT 0x01 | |
186 | #define FSFLOOR_MNT 0x02 | |
187 | #define FSHAT_MNT 0x04 | |
188 | #define FSROOT_MNT 0x08 | |
189 | #define FSTRANS_MNT 0x10 | |
190 | ||
191 | #define NUM_SMK_MNT_OPTS 5 | |
192 | ||
193 | enum { | |
194 | Opt_error = -1, | |
195 | Opt_fsdefault = 1, | |
196 | Opt_fsfloor = 2, | |
197 | Opt_fshat = 3, | |
198 | Opt_fsroot = 4, | |
199 | Opt_fstransmute = 5, | |
200 | }; | |
201 | ||
e114e473 CS |
202 | /* |
203 | * Mount options | |
204 | */ | |
205 | #define SMK_FSDEFAULT "smackfsdef=" | |
206 | #define SMK_FSFLOOR "smackfsfloor=" | |
207 | #define SMK_FSHAT "smackfshat=" | |
208 | #define SMK_FSROOT "smackfsroot=" | |
e830b394 | 209 | #define SMK_FSTRANS "smackfstransmute=" |
e114e473 | 210 | |
21abb1ec | 211 | #define SMACK_DELETE_OPTION "-DELETE" |
4303154e EB |
212 | #define SMACK_CIPSO_OPTION "-CIPSO" |
213 | ||
e114e473 | 214 | /* |
6d3dc07c CS |
215 | * How communications on this socket are treated. |
216 | * Usually it's determined by the underlying netlabel code | |
217 | * but there are certain cases, including single label hosts | |
218 | * and potentially single label interfaces for which the | |
219 | * treatment can not be known in advance. | |
220 | * | |
221 | * The possibility of additional labeling schemes being | |
222 | * introduced in the future exists as well. | |
223 | */ | |
224 | #define SMACK_UNLABELED_SOCKET 0 | |
225 | #define SMACK_CIPSO_SOCKET 1 | |
226 | ||
e114e473 CS |
227 | /* |
228 | * CIPSO defaults. | |
229 | */ | |
230 | #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ | |
6d3dc07c | 231 | #define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */ |
e114e473 | 232 | #define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ |
f7112e6c | 233 | #define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */ |
e114e473 | 234 | #define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ |
677264e8 CS |
235 | /* |
236 | * CIPSO 2.2 standard is 239, but Smack wants to use the | |
237 | * categories in a structured way that limits the value to | |
238 | * the bits in 23 bytes, hence the unusual number. | |
239 | */ | |
240 | #define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */ | |
e114e473 | 241 | |
66867818 LP |
242 | /* |
243 | * Ptrace rules | |
244 | */ | |
245 | #define SMACK_PTRACE_DEFAULT 0 | |
246 | #define SMACK_PTRACE_EXACT 1 | |
247 | #define SMACK_PTRACE_DRACONIAN 2 | |
248 | #define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN | |
249 | ||
5c6d1125 | 250 | /* |
c0ab6e56 CS |
251 | * Flags for untraditional access modes. |
252 | * It shouldn't be necessary to avoid conflicts with definitions | |
253 | * in fs.h, but do so anyway. | |
5c6d1125 | 254 | */ |
c0ab6e56 CS |
255 | #define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */ |
256 | #define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */ | |
d166c802 | 257 | #define MAY_BRINGUP 0x00004000 /* Report use of this rule */ |
c0ab6e56 | 258 | |
c60b9066 CS |
259 | /* |
260 | * The policy for delivering signals is configurable. | |
261 | * It is usually "write", but can be "append". | |
262 | */ | |
263 | #ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS | |
264 | #define MAY_DELIVER MAY_APPEND /* Signal delivery requires append */ | |
265 | #else | |
266 | #define MAY_DELIVER MAY_WRITE /* Signal delivery requires write */ | |
267 | #endif | |
268 | ||
bf4b2fee CS |
269 | #define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */ |
270 | #define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */ | |
271 | #define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */ | |
272 | ||
e114e473 CS |
273 | /* |
274 | * Just to make the common cases easier to deal with | |
275 | */ | |
e114e473 | 276 | #define MAY_ANYREAD (MAY_READ | MAY_EXEC) |
e114e473 CS |
277 | #define MAY_READWRITE (MAY_READ | MAY_WRITE) |
278 | #define MAY_NOT 0 | |
279 | ||
ecfcc53f | 280 | /* |
d166c802 | 281 | * Number of access types used by Smack (rwxatlb) |
ecfcc53f | 282 | */ |
d166c802 | 283 | #define SMK_NUM_ACCESS_TYPE 7 |
ecfcc53f | 284 | |
3b3b0e4f EP |
285 | /* SMACK data */ |
286 | struct smack_audit_data { | |
287 | const char *function; | |
288 | char *subject; | |
289 | char *object; | |
290 | char *request; | |
291 | int result; | |
292 | }; | |
293 | ||
ecfcc53f EB |
294 | /* |
295 | * Smack audit data; is empty if CONFIG_AUDIT not set | |
296 | * to save some stack | |
297 | */ | |
298 | struct smk_audit_info { | |
299 | #ifdef CONFIG_AUDIT | |
300 | struct common_audit_data a; | |
3b3b0e4f | 301 | struct smack_audit_data sad; |
ecfcc53f EB |
302 | #endif |
303 | }; | |
e114e473 CS |
304 | |
305 | /* | |
306 | * These functions are in smack_access.c | |
307 | */ | |
7898e1f8 | 308 | int smk_access_entry(char *, char *, struct list_head *); |
21c7eae2 LP |
309 | int smk_access(struct smack_known *, struct smack_known *, |
310 | int, struct smk_audit_info *); | |
311 | int smk_tskacc(struct task_smack *, struct smack_known *, | |
312 | u32, struct smk_audit_info *); | |
313 | int smk_curacc(struct smack_known *, u32, struct smk_audit_info *); | |
2f823ff8 | 314 | struct smack_known *smack_from_secid(const u32); |
f7112e6c CS |
315 | char *smk_parse_smack(const char *string, int len); |
316 | int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int); | |
e114e473 | 317 | struct smack_known *smk_import_entry(const char *, int); |
4d7cf4a1 | 318 | void smk_insert_entry(struct smack_known *skp); |
272cd7a8 | 319 | struct smack_known *smk_find_entry(const char *); |
c0d77c88 | 320 | int smack_privileged(int cap); |
38416e53 | 321 | void smk_destroy_label_list(struct list_head *list); |
e114e473 CS |
322 | |
323 | /* | |
324 | * Shared data. | |
325 | */ | |
69f287ae | 326 | extern int smack_enabled; |
e114e473 | 327 | extern int smack_cipso_direct; |
f7112e6c | 328 | extern int smack_cipso_mapped; |
2f823ff8 | 329 | extern struct smack_known *smack_net_ambient; |
00f84f3f | 330 | extern struct smack_known *smack_syslog_label; |
bf4b2fee CS |
331 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
332 | extern struct smack_known *smack_unconfined; | |
333 | #endif | |
66867818 | 334 | extern int smack_ptrace_rule; |
e114e473 | 335 | |
e114e473 CS |
336 | extern struct smack_known smack_known_floor; |
337 | extern struct smack_known smack_known_hat; | |
338 | extern struct smack_known smack_known_huh; | |
e114e473 | 339 | extern struct smack_known smack_known_star; |
6d3dc07c | 340 | extern struct smack_known smack_known_web; |
e114e473 | 341 | |
f7112e6c | 342 | extern struct mutex smack_known_lock; |
7198e2ee | 343 | extern struct list_head smack_known_list; |
21abb1ec CS |
344 | extern struct list_head smk_net4addr_list; |
345 | #if IS_ENABLED(CONFIG_IPV6) | |
346 | extern struct list_head smk_net6addr_list; | |
347 | #endif /* CONFIG_IPV6 */ | |
7198e2ee | 348 | |
c0d77c88 RK |
349 | extern struct mutex smack_onlycap_lock; |
350 | extern struct list_head smack_onlycap_list; | |
351 | ||
4d7cf4a1 TS |
352 | #define SMACK_HASH_SLOTS 16 |
353 | extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS]; | |
354 | ||
5c6d1125 JS |
355 | /* |
356 | * Is the directory transmuting? | |
357 | */ | |
358 | static inline int smk_inode_transmutable(const struct inode *isp) | |
359 | { | |
360 | struct inode_smack *sip = isp->i_security; | |
361 | return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; | |
362 | } | |
363 | ||
e114e473 | 364 | /* |
21c7eae2 | 365 | * Present a pointer to the smack label entry in an inode blob. |
e114e473 | 366 | */ |
21c7eae2 | 367 | static inline struct smack_known *smk_of_inode(const struct inode *isp) |
e114e473 CS |
368 | { |
369 | struct inode_smack *sip = isp->i_security; | |
370 | return sip->smk_inode; | |
371 | } | |
372 | ||
676dac4b | 373 | /* |
2f823ff8 | 374 | * Present a pointer to the smack label entry in an task blob. |
676dac4b | 375 | */ |
2f823ff8 | 376 | static inline struct smack_known *smk_of_task(const struct task_smack *tsp) |
676dac4b CS |
377 | { |
378 | return tsp->smk_task; | |
379 | } | |
380 | ||
6d1cff2a AR |
381 | static inline struct smack_known *smk_of_task_struct(const struct task_struct *t) |
382 | { | |
383 | struct smack_known *skp; | |
384 | ||
385 | rcu_read_lock(); | |
386 | skp = smk_of_task(__task_cred(t)->security); | |
387 | rcu_read_unlock(); | |
388 | return skp; | |
389 | } | |
390 | ||
676dac4b | 391 | /* |
2f823ff8 | 392 | * Present a pointer to the forked smack label entry in an task blob. |
676dac4b | 393 | */ |
2f823ff8 | 394 | static inline struct smack_known *smk_of_forked(const struct task_smack *tsp) |
676dac4b CS |
395 | { |
396 | return tsp->smk_forked; | |
397 | } | |
398 | ||
399 | /* | |
5c6d1125 | 400 | * Present a pointer to the smack label in the current task blob. |
676dac4b | 401 | */ |
2f823ff8 | 402 | static inline struct smack_known *smk_of_current(void) |
676dac4b CS |
403 | { |
404 | return smk_of_task(current_security()); | |
405 | } | |
406 | ||
ecfcc53f EB |
407 | /* |
408 | * logging functions | |
409 | */ | |
410 | #define SMACK_AUDIT_DENIED 0x1 | |
411 | #define SMACK_AUDIT_ACCEPT 0x2 | |
412 | extern int log_policy; | |
413 | ||
414 | void smack_log(char *subject_label, char *object_label, | |
415 | int request, | |
416 | int result, struct smk_audit_info *auditdata); | |
417 | ||
418 | #ifdef CONFIG_AUDIT | |
419 | ||
420 | /* | |
421 | * some inline functions to set up audit data | |
422 | * they do nothing if CONFIG_AUDIT is not set | |
423 | * | |
424 | */ | |
425 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
426 | char type) | |
427 | { | |
50c205f5 | 428 | memset(&a->sad, 0, sizeof(a->sad)); |
ecfcc53f | 429 | a->a.type = type; |
3b3b0e4f EP |
430 | a->a.smack_audit_data = &a->sad; |
431 | a->a.smack_audit_data->function = func; | |
ecfcc53f EB |
432 | } |
433 | ||
48c62af6 EP |
434 | static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func, |
435 | char type, struct lsm_network_audit *net) | |
436 | { | |
437 | smk_ad_init(a, func, type); | |
438 | memset(net, 0, sizeof(*net)); | |
439 | a->a.u.net = net; | |
440 | } | |
441 | ||
ecfcc53f EB |
442 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, |
443 | struct task_struct *t) | |
444 | { | |
445 | a->a.u.tsk = t; | |
446 | } | |
447 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
448 | struct dentry *d) | |
449 | { | |
a269434d | 450 | a->a.u.dentry = d; |
ecfcc53f EB |
451 | } |
452 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
453 | struct inode *i) | |
454 | { | |
f48b7399 | 455 | a->a.u.inode = i; |
ecfcc53f EB |
456 | } |
457 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
458 | struct path p) | |
459 | { | |
f48b7399 | 460 | a->a.u.path = p; |
ecfcc53f EB |
461 | } |
462 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
463 | struct sock *sk) | |
464 | { | |
48c62af6 | 465 | a->a.u.net->sk = sk; |
ecfcc53f EB |
466 | } |
467 | ||
468 | #else /* no AUDIT */ | |
469 | ||
470 | static inline void smk_ad_init(struct smk_audit_info *a, const char *func, | |
471 | char type) | |
472 | { | |
473 | } | |
474 | static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, | |
475 | struct task_struct *t) | |
476 | { | |
477 | } | |
478 | static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, | |
479 | struct dentry *d) | |
480 | { | |
481 | } | |
482 | static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a, | |
483 | struct vfsmount *m) | |
484 | { | |
485 | } | |
486 | static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, | |
487 | struct inode *i) | |
488 | { | |
489 | } | |
490 | static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, | |
491 | struct path p) | |
492 | { | |
493 | } | |
494 | static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, | |
495 | struct sock *sk) | |
496 | { | |
497 | } | |
498 | #endif | |
499 | ||
e114e473 | 500 | #endif /* _SECURITY_SMACK_H */ |