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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 | * Authors: | |
9 | * Casey Schaufler <casey@schaufler-ca.com> | |
10 | * Ahmed S. Darwish <darwish.07@gmail.com> | |
11 | * | |
12 | * Special thanks to the authors of selinuxfs. | |
13 | * | |
14 | * Karl MacMillan <kmacmillan@tresys.com> | |
15 | * James Morris <jmorris@redhat.com> | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/security.h> | |
22 | #include <linux/mutex.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
6d3dc07c | 24 | #include <net/net_namespace.h> |
e114e473 CS |
25 | #include <net/netlabel.h> |
26 | #include <net/cipso_ipv4.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/ctype.h> | |
4bc87e62 | 29 | #include <linux/audit.h> |
e114e473 CS |
30 | #include "smack.h" |
31 | ||
32 | /* | |
33 | * smackfs pseudo filesystem. | |
34 | */ | |
35 | ||
36 | enum smk_inos { | |
37 | SMK_ROOT_INO = 2, | |
38 | SMK_LOAD = 3, /* load policy */ | |
39 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ | |
40 | SMK_DOI = 5, /* CIPSO DOI */ | |
41 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ | |
42 | SMK_AMBIENT = 7, /* internet ambient label */ | |
6d3dc07c | 43 | SMK_NETLBLADDR = 8, /* single label hosts */ |
15446235 | 44 | SMK_ONLYCAP = 9, /* the only "capable" label */ |
ecfcc53f | 45 | SMK_LOGGING = 10, /* logging */ |
7898e1f8 | 46 | SMK_LOAD_SELF = 11, /* task specific rules */ |
828716c2 | 47 | SMK_ACCESSES = 12, /* access policy */ |
e114e473 CS |
48 | }; |
49 | ||
50 | /* | |
51 | * List locks | |
52 | */ | |
53 | static DEFINE_MUTEX(smack_list_lock); | |
54 | static DEFINE_MUTEX(smack_cipso_lock); | |
4bc87e62 | 55 | static DEFINE_MUTEX(smack_ambient_lock); |
6d3dc07c | 56 | static DEFINE_MUTEX(smk_netlbladdr_lock); |
e114e473 CS |
57 | |
58 | /* | |
59 | * This is the "ambient" label for network traffic. | |
60 | * If it isn't somehow marked, use this. | |
61 | * It can be reset via smackfs/ambient | |
62 | */ | |
63 | char *smack_net_ambient = smack_known_floor.smk_known; | |
64 | ||
e114e473 CS |
65 | /* |
66 | * This is the level in a CIPSO header that indicates a | |
67 | * smack label is contained directly in the category set. | |
68 | * It can be reset via smackfs/direct | |
69 | */ | |
70 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
71 | ||
15446235 CS |
72 | /* |
73 | * Unless a process is running with this label even | |
74 | * having CAP_MAC_OVERRIDE isn't enough to grant | |
75 | * privilege to violate MAC policy. If no label is | |
76 | * designated (the NULL case) capabilities apply to | |
77 | * everyone. It is expected that the hat (^) label | |
78 | * will be used if any label is used. | |
79 | */ | |
80 | char *smack_onlycap; | |
81 | ||
6d3dc07c CS |
82 | /* |
83 | * Certain IP addresses may be designated as single label hosts. | |
84 | * Packets are sent there unlabeled, but only from tasks that | |
85 | * can write to the specified label. | |
86 | */ | |
7198e2ee EB |
87 | |
88 | LIST_HEAD(smk_netlbladdr_list); | |
272cd7a8 CS |
89 | |
90 | /* | |
91 | * Rule lists are maintained for each label. | |
92 | * This master list is just for reading /smack/load. | |
93 | */ | |
94 | struct smack_master_list { | |
95 | struct list_head list; | |
96 | struct smack_rule *smk_rule; | |
97 | }; | |
98 | ||
7198e2ee | 99 | LIST_HEAD(smack_rule_list); |
6d3dc07c | 100 | |
e114e473 | 101 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 102 | |
4303154e EB |
103 | const char *smack_cipso_option = SMACK_CIPSO_OPTION; |
104 | ||
105 | ||
272cd7a8 | 106 | #define SEQ_READ_FINISHED ((loff_t)-1) |
e114e473 | 107 | |
e114e473 CS |
108 | /* |
109 | * Values for parsing cipso rules | |
110 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
111 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
112 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
113 | */ |
114 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
115 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
116 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
117 | ||
118 | /* | |
119 | * Values for parsing MAC rules | |
120 | * SMK_ACCESS: Maximum possible combination of access permissions | |
121 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
122 | * SMK_LOADLEN: Smack rule length | |
123 | */ | |
5c6d1125 JS |
124 | #define SMK_OACCESS "rwxa" |
125 | #define SMK_ACCESS "rwxat" | |
126 | #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) | |
127 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
128 | #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) | |
129 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
b500ce8d | 130 | |
6d3dc07c CS |
131 | /** |
132 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
133 | * @nap: structure to fill | |
134 | */ | |
135 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
136 | { | |
137 | nap->loginuid = audit_get_loginuid(current); | |
138 | nap->sessionid = audit_get_sessionid(current); | |
676dac4b | 139 | nap->secid = smack_to_secid(smk_of_current()); |
6d3dc07c CS |
140 | } |
141 | ||
142 | /* | |
143 | * Values for parsing single label host rules | |
144 | * "1.2.3.4 X" | |
145 | * "192.168.138.129/32 abcdefghijklmnopqrstuvw" | |
146 | */ | |
147 | #define SMK_NETLBLADDRMIN 9 | |
148 | #define SMK_NETLBLADDRMAX 42 | |
e114e473 | 149 | |
e114e473 CS |
150 | /** |
151 | * smk_set_access - add a rule to the rule list | |
152 | * @srp: the new rule to add | |
7898e1f8 CS |
153 | * @rule_list: the list of rules |
154 | * @rule_lock: the rule list lock | |
e114e473 CS |
155 | * |
156 | * Looks through the current subject/object/access list for | |
157 | * the subject/object pair and replaces the access that was | |
158 | * there. If the pair isn't found add it with the specified | |
159 | * access. | |
81ea714b | 160 | * |
7898e1f8 | 161 | * Returns 1 if a rule was found to exist already, 0 if it is new |
81ea714b SL |
162 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails |
163 | * during the allocation of the new pair to add. | |
e114e473 | 164 | */ |
7898e1f8 CS |
165 | static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list, |
166 | struct mutex *rule_lock) | |
e114e473 | 167 | { |
7198e2ee | 168 | struct smack_rule *sp; |
7898e1f8 | 169 | int found = 0; |
e114e473 | 170 | |
7898e1f8 CS |
171 | mutex_lock(rule_lock); |
172 | ||
272cd7a8 CS |
173 | /* |
174 | * Because the object label is less likely to match | |
175 | * than the subject label check it first | |
176 | */ | |
7898e1f8 | 177 | list_for_each_entry_rcu(sp, rule_list, list) { |
272cd7a8 CS |
178 | if (sp->smk_object == srp->smk_object && |
179 | sp->smk_subject == srp->smk_subject) { | |
7198e2ee EB |
180 | found = 1; |
181 | sp->smk_access = srp->smk_access; | |
e114e473 CS |
182 | break; |
183 | } | |
e114e473 | 184 | } |
7198e2ee | 185 | if (found == 0) |
7898e1f8 | 186 | list_add_rcu(&srp->list, rule_list); |
e114e473 | 187 | |
7898e1f8 | 188 | mutex_unlock(rule_lock); |
e114e473 | 189 | |
7898e1f8 | 190 | return found; |
e114e473 CS |
191 | } |
192 | ||
193 | /** | |
828716c2 JS |
194 | * smk_parse_rule - parse subject, object and access type |
195 | * @data: string to be parsed whose size is SMK_LOADLEN | |
196 | * @rule: parsed entities are stored in here | |
e114e473 | 197 | */ |
828716c2 | 198 | static int smk_parse_rule(const char *data, struct smack_rule *rule) |
e114e473 | 199 | { |
7198e2ee EB |
200 | rule->smk_subject = smk_import(data, 0); |
201 | if (rule->smk_subject == NULL) | |
828716c2 | 202 | return -1; |
e114e473 | 203 | |
7198e2ee EB |
204 | rule->smk_object = smk_import(data + SMK_LABELLEN, 0); |
205 | if (rule->smk_object == NULL) | |
828716c2 | 206 | return -1; |
7198e2ee EB |
207 | |
208 | rule->smk_access = 0; | |
e114e473 CS |
209 | |
210 | switch (data[SMK_LABELLEN + SMK_LABELLEN]) { | |
211 | case '-': | |
212 | break; | |
213 | case 'r': | |
214 | case 'R': | |
7198e2ee | 215 | rule->smk_access |= MAY_READ; |
e114e473 CS |
216 | break; |
217 | default: | |
828716c2 | 218 | return -1; |
e114e473 CS |
219 | } |
220 | ||
221 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { | |
222 | case '-': | |
223 | break; | |
224 | case 'w': | |
225 | case 'W': | |
7198e2ee | 226 | rule->smk_access |= MAY_WRITE; |
e114e473 CS |
227 | break; |
228 | default: | |
828716c2 | 229 | return -1; |
e114e473 CS |
230 | } |
231 | ||
232 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { | |
233 | case '-': | |
234 | break; | |
235 | case 'x': | |
236 | case 'X': | |
7198e2ee | 237 | rule->smk_access |= MAY_EXEC; |
e114e473 CS |
238 | break; |
239 | default: | |
828716c2 | 240 | return -1; |
e114e473 CS |
241 | } |
242 | ||
243 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { | |
244 | case '-': | |
245 | break; | |
246 | case 'a': | |
247 | case 'A': | |
7198e2ee | 248 | rule->smk_access |= MAY_APPEND; |
e114e473 CS |
249 | break; |
250 | default: | |
828716c2 | 251 | return -1; |
e114e473 CS |
252 | } |
253 | ||
5c6d1125 JS |
254 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 4]) { |
255 | case '-': | |
256 | break; | |
257 | case 't': | |
258 | case 'T': | |
259 | rule->smk_access |= MAY_TRANSMUTE; | |
260 | break; | |
261 | default: | |
828716c2 | 262 | return -1; |
5c6d1125 JS |
263 | } |
264 | ||
828716c2 JS |
265 | return 0; |
266 | } | |
267 | ||
268 | /** | |
269 | * smk_write_load_list - write() for any /smack/load | |
270 | * @file: file pointer, not actually used | |
271 | * @buf: where to get the data from | |
272 | * @count: bytes sent | |
273 | * @ppos: where to start - must be 0 | |
274 | * @rule_list: the list of rules to write to | |
275 | * @rule_lock: lock for the rule list | |
276 | * | |
277 | * Get one smack access rule from above. | |
278 | * The format is exactly: | |
279 | * char subject[SMK_LABELLEN] | |
280 | * char object[SMK_LABELLEN] | |
281 | * char access[SMK_ACCESSLEN] | |
282 | * | |
283 | * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. | |
284 | */ | |
285 | static ssize_t smk_write_load_list(struct file *file, const char __user *buf, | |
286 | size_t count, loff_t *ppos, | |
287 | struct list_head *rule_list, | |
288 | struct mutex *rule_lock) | |
289 | { | |
272cd7a8 CS |
290 | struct smack_master_list *smlp; |
291 | struct smack_known *skp; | |
828716c2 JS |
292 | struct smack_rule *rule; |
293 | char *data; | |
294 | int rc = -EINVAL; | |
272cd7a8 | 295 | int load = 0; |
828716c2 JS |
296 | |
297 | /* | |
298 | * No partial writes. | |
299 | * Enough data must be present. | |
300 | */ | |
301 | if (*ppos != 0) | |
302 | return -EINVAL; | |
303 | /* | |
304 | * Minor hack for backward compatibility | |
305 | */ | |
306 | if (count < (SMK_OLOADLEN) || count > SMK_LOADLEN) | |
307 | return -EINVAL; | |
308 | ||
309 | data = kzalloc(SMK_LOADLEN, GFP_KERNEL); | |
310 | if (data == NULL) | |
311 | return -ENOMEM; | |
312 | ||
313 | if (copy_from_user(data, buf, count) != 0) { | |
314 | rc = -EFAULT; | |
315 | goto out; | |
316 | } | |
317 | ||
318 | /* | |
319 | * More on the minor hack for backward compatibility | |
320 | */ | |
321 | if (count == (SMK_OLOADLEN)) | |
322 | data[SMK_OLOADLEN] = '-'; | |
323 | ||
324 | rule = kzalloc(sizeof(*rule), GFP_KERNEL); | |
325 | if (rule == NULL) { | |
326 | rc = -ENOMEM; | |
327 | goto out; | |
328 | } | |
329 | ||
330 | if (smk_parse_rule(data, rule)) | |
331 | goto out_free_rule; | |
332 | ||
272cd7a8 CS |
333 | if (rule_list == NULL) { |
334 | load = 1; | |
335 | skp = smk_find_entry(rule->smk_subject); | |
336 | rule_list = &skp->smk_rules; | |
337 | rule_lock = &skp->smk_rules_lock; | |
338 | } | |
339 | ||
7898e1f8 CS |
340 | rc = count; |
341 | /* | |
342 | * smk_set_access returns true if there was already a rule | |
343 | * for the subject/object pair, and false if it was new. | |
344 | */ | |
272cd7a8 CS |
345 | if (!smk_set_access(rule, rule_list, rule_lock)) { |
346 | smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); | |
347 | if (smlp != NULL) { | |
348 | smlp->smk_rule = rule; | |
349 | list_add_rcu(&smlp->list, &smack_rule_list); | |
350 | } else | |
351 | rc = -ENOMEM; | |
7898e1f8 | 352 | goto out; |
272cd7a8 | 353 | } |
e114e473 | 354 | |
7198e2ee EB |
355 | out_free_rule: |
356 | kfree(rule); | |
e114e473 CS |
357 | out: |
358 | kfree(data); | |
359 | return rc; | |
360 | } | |
361 | ||
7898e1f8 CS |
362 | |
363 | /* | |
364 | * Seq_file read operations for /smack/load | |
365 | */ | |
366 | ||
367 | static void *load_seq_start(struct seq_file *s, loff_t *pos) | |
368 | { | |
272cd7a8 CS |
369 | struct list_head *list; |
370 | ||
371 | /* | |
372 | * This is 0 the first time through. | |
373 | */ | |
374 | if (s->index == 0) | |
375 | s->private = &smack_rule_list; | |
376 | ||
377 | if (s->private == NULL) | |
7898e1f8 | 378 | return NULL; |
272cd7a8 CS |
379 | |
380 | list = s->private; | |
381 | if (list_empty(list)) | |
7898e1f8 | 382 | return NULL; |
272cd7a8 CS |
383 | |
384 | if (s->index == 0) | |
385 | return list->next; | |
386 | return list; | |
7898e1f8 CS |
387 | } |
388 | ||
389 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
390 | { | |
391 | struct list_head *list = v; | |
392 | ||
393 | if (list_is_last(list, &smack_rule_list)) { | |
272cd7a8 | 394 | s->private = NULL; |
7898e1f8 CS |
395 | return NULL; |
396 | } | |
272cd7a8 | 397 | s->private = list->next; |
7898e1f8 CS |
398 | return list->next; |
399 | } | |
400 | ||
401 | static int load_seq_show(struct seq_file *s, void *v) | |
402 | { | |
403 | struct list_head *list = v; | |
272cd7a8 CS |
404 | struct smack_master_list *smlp = |
405 | list_entry(list, struct smack_master_list, list); | |
406 | struct smack_rule *srp = smlp->smk_rule; | |
7898e1f8 CS |
407 | |
408 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
409 | (char *)srp->smk_object); | |
410 | ||
411 | seq_putc(s, ' '); | |
412 | ||
413 | if (srp->smk_access & MAY_READ) | |
414 | seq_putc(s, 'r'); | |
415 | if (srp->smk_access & MAY_WRITE) | |
416 | seq_putc(s, 'w'); | |
417 | if (srp->smk_access & MAY_EXEC) | |
418 | seq_putc(s, 'x'); | |
419 | if (srp->smk_access & MAY_APPEND) | |
420 | seq_putc(s, 'a'); | |
421 | if (srp->smk_access & MAY_TRANSMUTE) | |
422 | seq_putc(s, 't'); | |
423 | if (srp->smk_access == 0) | |
424 | seq_putc(s, '-'); | |
425 | ||
426 | seq_putc(s, '\n'); | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
431 | static void load_seq_stop(struct seq_file *s, void *v) | |
432 | { | |
433 | /* No-op */ | |
434 | } | |
435 | ||
436 | static const struct seq_operations load_seq_ops = { | |
437 | .start = load_seq_start, | |
438 | .next = load_seq_next, | |
439 | .show = load_seq_show, | |
440 | .stop = load_seq_stop, | |
441 | }; | |
442 | ||
443 | /** | |
444 | * smk_open_load - open() for /smack/load | |
445 | * @inode: inode structure representing file | |
446 | * @file: "load" file pointer | |
447 | * | |
448 | * For reading, use load_seq_* seq_file reading operations. | |
449 | */ | |
450 | static int smk_open_load(struct inode *inode, struct file *file) | |
451 | { | |
452 | return seq_open(file, &load_seq_ops); | |
453 | } | |
454 | ||
455 | /** | |
456 | * smk_write_load - write() for /smack/load | |
457 | * @file: file pointer, not actually used | |
458 | * @buf: where to get the data from | |
459 | * @count: bytes sent | |
460 | * @ppos: where to start - must be 0 | |
461 | * | |
462 | */ | |
463 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
464 | size_t count, loff_t *ppos) | |
465 | { | |
466 | ||
467 | /* | |
468 | * Must have privilege. | |
469 | * No partial writes. | |
470 | * Enough data must be present. | |
471 | */ | |
472 | if (!capable(CAP_MAC_ADMIN)) | |
473 | return -EPERM; | |
474 | ||
272cd7a8 | 475 | return smk_write_load_list(file, buf, count, ppos, NULL, NULL); |
7898e1f8 CS |
476 | } |
477 | ||
e114e473 CS |
478 | static const struct file_operations smk_load_ops = { |
479 | .open = smk_open_load, | |
480 | .read = seq_read, | |
481 | .llseek = seq_lseek, | |
482 | .write = smk_write_load, | |
cb622bbb | 483 | .release = seq_release, |
e114e473 CS |
484 | }; |
485 | ||
486 | /** | |
487 | * smk_cipso_doi - initialize the CIPSO domain | |
488 | */ | |
30aa4faf | 489 | static void smk_cipso_doi(void) |
e114e473 CS |
490 | { |
491 | int rc; | |
492 | struct cipso_v4_doi *doip; | |
6d3dc07c | 493 | struct netlbl_audit nai; |
e114e473 | 494 | |
6d3dc07c | 495 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 496 | |
6d3dc07c | 497 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
498 | if (rc != 0) |
499 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
500 | __func__, __LINE__, rc); | |
501 | ||
502 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
503 | if (doip == NULL) | |
504 | panic("smack: Failed to initialize cipso DOI.\n"); | |
505 | doip->map.std = NULL; | |
506 | doip->doi = smk_cipso_doi_value; | |
507 | doip->type = CIPSO_V4_MAP_PASS; | |
508 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
509 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
510 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
511 | ||
6d3dc07c | 512 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 513 | if (rc != 0) { |
6c2e8ac0 PM |
514 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
515 | __func__, __LINE__, rc); | |
516 | kfree(doip); | |
517 | return; | |
518 | } | |
6d3dc07c | 519 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
520 | if (rc != 0) { |
521 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 522 | __func__, __LINE__, rc); |
b1edeb10 | 523 | kfree(doip); |
6c2e8ac0 | 524 | return; |
b1edeb10 | 525 | } |
e114e473 CS |
526 | } |
527 | ||
4bc87e62 CS |
528 | /** |
529 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 530 | * @oldambient: previous domain string |
4bc87e62 | 531 | */ |
30aa4faf | 532 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
533 | { |
534 | int rc; | |
6d3dc07c | 535 | struct netlbl_audit nai; |
4bc87e62 | 536 | |
6d3dc07c | 537 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
538 | |
539 | if (oldambient != NULL) { | |
6d3dc07c | 540 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
541 | if (rc != 0) |
542 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
543 | __func__, __LINE__, rc); | |
544 | } | |
545 | ||
6d3dc07c CS |
546 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET, |
547 | NULL, NULL, &nai); | |
4bc87e62 CS |
548 | if (rc != 0) |
549 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
550 | __func__, __LINE__, rc); | |
551 | } | |
552 | ||
e114e473 CS |
553 | /* |
554 | * Seq_file read operations for /smack/cipso | |
555 | */ | |
556 | ||
557 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
558 | { | |
559 | if (*pos == SEQ_READ_FINISHED) | |
560 | return NULL; | |
7198e2ee EB |
561 | if (list_empty(&smack_known_list)) |
562 | return NULL; | |
e114e473 | 563 | |
7198e2ee | 564 | return smack_known_list.next; |
e114e473 CS |
565 | } |
566 | ||
567 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
568 | { | |
7198e2ee | 569 | struct list_head *list = v; |
e114e473 CS |
570 | |
571 | /* | |
7198e2ee EB |
572 | * labels with no associated cipso value wont be printed |
573 | * in cipso_seq_show | |
e114e473 | 574 | */ |
7198e2ee | 575 | if (list_is_last(list, &smack_known_list)) { |
e114e473 | 576 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
577 | return NULL; |
578 | } | |
e114e473 | 579 | |
7198e2ee | 580 | return list->next; |
e114e473 CS |
581 | } |
582 | ||
583 | /* | |
584 | * Print cipso labels in format: | |
585 | * label level[/cat[,cat]] | |
586 | */ | |
587 | static int cipso_seq_show(struct seq_file *s, void *v) | |
588 | { | |
7198e2ee EB |
589 | struct list_head *list = v; |
590 | struct smack_known *skp = | |
591 | list_entry(list, struct smack_known, list); | |
e114e473 CS |
592 | struct smack_cipso *scp = skp->smk_cipso; |
593 | char *cbp; | |
594 | char sep = '/'; | |
595 | int cat = 1; | |
596 | int i; | |
597 | unsigned char m; | |
598 | ||
599 | if (scp == NULL) | |
600 | return 0; | |
601 | ||
602 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); | |
603 | ||
604 | cbp = scp->smk_catset; | |
605 | for (i = 0; i < SMK_LABELLEN; i++) | |
606 | for (m = 0x80; m != 0; m >>= 1) { | |
607 | if (m & cbp[i]) { | |
608 | seq_printf(s, "%c%d", sep, cat); | |
609 | sep = ','; | |
610 | } | |
611 | cat++; | |
612 | } | |
613 | ||
614 | seq_putc(s, '\n'); | |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
619 | static void cipso_seq_stop(struct seq_file *s, void *v) | |
620 | { | |
621 | /* No-op */ | |
622 | } | |
623 | ||
88e9d34c | 624 | static const struct seq_operations cipso_seq_ops = { |
e114e473 CS |
625 | .start = cipso_seq_start, |
626 | .stop = cipso_seq_stop, | |
627 | .next = cipso_seq_next, | |
628 | .show = cipso_seq_show, | |
629 | }; | |
630 | ||
631 | /** | |
632 | * smk_open_cipso - open() for /smack/cipso | |
633 | * @inode: inode structure representing file | |
634 | * @file: "cipso" file pointer | |
635 | * | |
636 | * Connect our cipso_seq_* operations with /smack/cipso | |
637 | * file_operations | |
638 | */ | |
639 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
640 | { | |
641 | return seq_open(file, &cipso_seq_ops); | |
642 | } | |
643 | ||
644 | /** | |
645 | * smk_write_cipso - write() for /smack/cipso | |
251a2a95 | 646 | * @file: file pointer, not actually used |
e114e473 CS |
647 | * @buf: where to get the data from |
648 | * @count: bytes sent | |
649 | * @ppos: where to start | |
650 | * | |
651 | * Accepts only one cipso rule per write call. | |
652 | * Returns number of bytes written or error code, as appropriate | |
653 | */ | |
654 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
655 | size_t count, loff_t *ppos) | |
656 | { | |
657 | struct smack_known *skp; | |
658 | struct smack_cipso *scp = NULL; | |
659 | char mapcatset[SMK_LABELLEN]; | |
660 | int maplevel; | |
661 | int cat; | |
662 | int catlen; | |
663 | ssize_t rc = -EINVAL; | |
664 | char *data = NULL; | |
665 | char *rule; | |
666 | int ret; | |
667 | int i; | |
668 | ||
669 | /* | |
670 | * Must have privilege. | |
671 | * No partial writes. | |
672 | * Enough data must be present. | |
673 | */ | |
674 | if (!capable(CAP_MAC_ADMIN)) | |
675 | return -EPERM; | |
676 | if (*ppos != 0) | |
677 | return -EINVAL; | |
b500ce8d | 678 | if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) |
e114e473 CS |
679 | return -EINVAL; |
680 | ||
681 | data = kzalloc(count + 1, GFP_KERNEL); | |
682 | if (data == NULL) | |
683 | return -ENOMEM; | |
684 | ||
685 | if (copy_from_user(data, buf, count) != 0) { | |
686 | rc = -EFAULT; | |
687 | goto unlockedout; | |
688 | } | |
689 | ||
4303154e EB |
690 | /* labels cannot begin with a '-' */ |
691 | if (data[0] == '-') { | |
692 | rc = -EINVAL; | |
693 | goto unlockedout; | |
694 | } | |
e114e473 CS |
695 | data[count] = '\0'; |
696 | rule = data; | |
697 | /* | |
698 | * Only allow one writer at a time. Writes should be | |
699 | * quite rare and small in any case. | |
700 | */ | |
701 | mutex_lock(&smack_cipso_lock); | |
702 | ||
703 | skp = smk_import_entry(rule, 0); | |
704 | if (skp == NULL) | |
705 | goto out; | |
706 | ||
c19a28e1 | 707 | rule += SMK_LABELLEN; |
e114e473 CS |
708 | ret = sscanf(rule, "%d", &maplevel); |
709 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
710 | goto out; | |
711 | ||
712 | rule += SMK_DIGITLEN; | |
713 | ret = sscanf(rule, "%d", &catlen); | |
714 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
715 | goto out; | |
716 | ||
b500ce8d | 717 | if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
e114e473 CS |
718 | goto out; |
719 | ||
720 | memset(mapcatset, 0, sizeof(mapcatset)); | |
721 | ||
722 | for (i = 0; i < catlen; i++) { | |
723 | rule += SMK_DIGITLEN; | |
724 | ret = sscanf(rule, "%d", &cat); | |
725 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) | |
726 | goto out; | |
727 | ||
728 | smack_catset_bit(cat, mapcatset); | |
729 | } | |
730 | ||
731 | if (skp->smk_cipso == NULL) { | |
732 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); | |
733 | if (scp == NULL) { | |
734 | rc = -ENOMEM; | |
735 | goto out; | |
736 | } | |
737 | } | |
738 | ||
739 | spin_lock_bh(&skp->smk_cipsolock); | |
740 | ||
741 | if (scp == NULL) | |
742 | scp = skp->smk_cipso; | |
743 | else | |
744 | skp->smk_cipso = scp; | |
745 | ||
746 | scp->smk_level = maplevel; | |
747 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); | |
748 | ||
749 | spin_unlock_bh(&skp->smk_cipsolock); | |
750 | ||
751 | rc = count; | |
752 | out: | |
753 | mutex_unlock(&smack_cipso_lock); | |
754 | unlockedout: | |
755 | kfree(data); | |
756 | return rc; | |
757 | } | |
758 | ||
759 | static const struct file_operations smk_cipso_ops = { | |
760 | .open = smk_open_cipso, | |
761 | .read = seq_read, | |
762 | .llseek = seq_lseek, | |
763 | .write = smk_write_cipso, | |
764 | .release = seq_release, | |
765 | }; | |
766 | ||
6d3dc07c CS |
767 | /* |
768 | * Seq_file read operations for /smack/netlabel | |
769 | */ | |
770 | ||
771 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) | |
772 | { | |
773 | if (*pos == SEQ_READ_FINISHED) | |
774 | return NULL; | |
7198e2ee EB |
775 | if (list_empty(&smk_netlbladdr_list)) |
776 | return NULL; | |
777 | return smk_netlbladdr_list.next; | |
6d3dc07c CS |
778 | } |
779 | ||
780 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
781 | { | |
7198e2ee | 782 | struct list_head *list = v; |
6d3dc07c | 783 | |
7198e2ee | 784 | if (list_is_last(list, &smk_netlbladdr_list)) { |
6d3dc07c | 785 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
786 | return NULL; |
787 | } | |
6d3dc07c | 788 | |
7198e2ee | 789 | return list->next; |
6d3dc07c | 790 | } |
6d3dc07c CS |
791 | #define BEBITS (sizeof(__be32) * 8) |
792 | ||
793 | /* | |
794 | * Print host/label pairs | |
795 | */ | |
796 | static int netlbladdr_seq_show(struct seq_file *s, void *v) | |
797 | { | |
7198e2ee EB |
798 | struct list_head *list = v; |
799 | struct smk_netlbladdr *skp = | |
800 | list_entry(list, struct smk_netlbladdr, list); | |
6d3dc07c | 801 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
113a0e45 | 802 | int maskn; |
803 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); | |
6d3dc07c | 804 | |
113a0e45 | 805 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
6d3dc07c CS |
806 | |
807 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", | |
808 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
813 | static void netlbladdr_seq_stop(struct seq_file *s, void *v) | |
814 | { | |
815 | /* No-op */ | |
816 | } | |
817 | ||
88e9d34c | 818 | static const struct seq_operations netlbladdr_seq_ops = { |
6d3dc07c CS |
819 | .start = netlbladdr_seq_start, |
820 | .stop = netlbladdr_seq_stop, | |
821 | .next = netlbladdr_seq_next, | |
822 | .show = netlbladdr_seq_show, | |
823 | }; | |
824 | ||
825 | /** | |
826 | * smk_open_netlbladdr - open() for /smack/netlabel | |
827 | * @inode: inode structure representing file | |
828 | * @file: "netlabel" file pointer | |
829 | * | |
830 | * Connect our netlbladdr_seq_* operations with /smack/netlabel | |
831 | * file_operations | |
832 | */ | |
833 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) | |
834 | { | |
835 | return seq_open(file, &netlbladdr_seq_ops); | |
836 | } | |
837 | ||
113a0e45 | 838 | /** |
839 | * smk_netlbladdr_insert | |
840 | * @new : netlabel to insert | |
841 | * | |
842 | * This helper insert netlabel in the smack_netlbladdrs list | |
843 | * sorted by netmask length (longest to smallest) | |
7198e2ee EB |
844 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
845 | * | |
113a0e45 | 846 | */ |
847 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) | |
848 | { | |
7198e2ee | 849 | struct smk_netlbladdr *m, *m_next; |
113a0e45 | 850 | |
7198e2ee EB |
851 | if (list_empty(&smk_netlbladdr_list)) { |
852 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 853 | return; |
854 | } | |
855 | ||
05725f7e JP |
856 | m = list_entry_rcu(smk_netlbladdr_list.next, |
857 | struct smk_netlbladdr, list); | |
7198e2ee | 858 | |
113a0e45 | 859 | /* the comparison '>' is a bit hacky, but works */ |
7198e2ee EB |
860 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
861 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 862 | return; |
863 | } | |
7198e2ee EB |
864 | |
865 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { | |
866 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { | |
867 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 868 | return; |
869 | } | |
05725f7e JP |
870 | m_next = list_entry_rcu(m->list.next, |
871 | struct smk_netlbladdr, list); | |
7198e2ee EB |
872 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { |
873 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 874 | return; |
875 | } | |
876 | } | |
877 | } | |
878 | ||
879 | ||
6d3dc07c CS |
880 | /** |
881 | * smk_write_netlbladdr - write() for /smack/netlabel | |
251a2a95 | 882 | * @file: file pointer, not actually used |
6d3dc07c CS |
883 | * @buf: where to get the data from |
884 | * @count: bytes sent | |
885 | * @ppos: where to start | |
886 | * | |
887 | * Accepts only one netlbladdr per write call. | |
888 | * Returns number of bytes written or error code, as appropriate | |
889 | */ | |
890 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, | |
891 | size_t count, loff_t *ppos) | |
892 | { | |
893 | struct smk_netlbladdr *skp; | |
894 | struct sockaddr_in newname; | |
895 | char smack[SMK_LABELLEN]; | |
896 | char *sp; | |
6470c077 | 897 | char data[SMK_NETLBLADDRMAX + 1]; |
6d3dc07c CS |
898 | char *host = (char *)&newname.sin_addr.s_addr; |
899 | int rc; | |
900 | struct netlbl_audit audit_info; | |
901 | struct in_addr mask; | |
902 | unsigned int m; | |
7198e2ee | 903 | int found; |
113a0e45 | 904 | u32 mask_bits = (1<<31); |
6d3dc07c | 905 | __be32 nsa; |
113a0e45 | 906 | u32 temp_mask; |
6d3dc07c CS |
907 | |
908 | /* | |
909 | * Must have privilege. | |
910 | * No partial writes. | |
911 | * Enough data must be present. | |
912 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
913 | * "<addr, as a.b.c.d><space><label>" | |
914 | */ | |
915 | if (!capable(CAP_MAC_ADMIN)) | |
916 | return -EPERM; | |
917 | if (*ppos != 0) | |
918 | return -EINVAL; | |
919 | if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX) | |
920 | return -EINVAL; | |
921 | if (copy_from_user(data, buf, count) != 0) | |
922 | return -EFAULT; | |
923 | ||
924 | data[count] = '\0'; | |
925 | ||
926 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", | |
927 | &host[0], &host[1], &host[2], &host[3], &m, smack); | |
928 | if (rc != 6) { | |
929 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
930 | &host[0], &host[1], &host[2], &host[3], smack); | |
931 | if (rc != 5) | |
932 | return -EINVAL; | |
933 | m = BEBITS; | |
934 | } | |
935 | if (m > BEBITS) | |
936 | return -EINVAL; | |
937 | ||
4303154e EB |
938 | /* if smack begins with '-', its an option, don't import it */ |
939 | if (smack[0] != '-') { | |
940 | sp = smk_import(smack, 0); | |
941 | if (sp == NULL) | |
942 | return -EINVAL; | |
943 | } else { | |
944 | /* check known options */ | |
945 | if (strcmp(smack, smack_cipso_option) == 0) | |
946 | sp = (char *)smack_cipso_option; | |
947 | else | |
948 | return -EINVAL; | |
949 | } | |
6d3dc07c | 950 | |
113a0e45 | 951 | for (temp_mask = 0; m > 0; m--) { |
952 | temp_mask |= mask_bits; | |
953 | mask_bits >>= 1; | |
6d3dc07c | 954 | } |
113a0e45 | 955 | mask.s_addr = cpu_to_be32(temp_mask); |
956 | ||
957 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
958 | /* |
959 | * Only allow one writer at a time. Writes should be | |
960 | * quite rare and small in any case. | |
961 | */ | |
962 | mutex_lock(&smk_netlbladdr_lock); | |
963 | ||
964 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 965 | /* try to find if the prefix is already in the list */ |
7198e2ee EB |
966 | found = 0; |
967 | list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { | |
6d3dc07c | 968 | if (skp->smk_host.sin_addr.s_addr == nsa && |
7198e2ee EB |
969 | skp->smk_mask.s_addr == mask.s_addr) { |
970 | found = 1; | |
6d3dc07c | 971 | break; |
7198e2ee EB |
972 | } |
973 | } | |
6d3dc07c CS |
974 | smk_netlabel_audit_set(&audit_info); |
975 | ||
7198e2ee | 976 | if (found == 0) { |
6d3dc07c CS |
977 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
978 | if (skp == NULL) | |
979 | rc = -ENOMEM; | |
980 | else { | |
981 | rc = 0; | |
982 | skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; | |
983 | skp->smk_mask.s_addr = mask.s_addr; | |
6d3dc07c | 984 | skp->smk_label = sp; |
113a0e45 | 985 | smk_netlbladdr_insert(skp); |
6d3dc07c CS |
986 | } |
987 | } else { | |
4303154e | 988 | /* we delete the unlabeled entry, only if the previous label |
25985edc | 989 | * wasn't the special CIPSO option */ |
4303154e EB |
990 | if (skp->smk_label != smack_cipso_option) |
991 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, | |
992 | &skp->smk_host.sin_addr, &skp->smk_mask, | |
993 | PF_INET, &audit_info); | |
994 | else | |
995 | rc = 0; | |
6d3dc07c CS |
996 | skp->smk_label = sp; |
997 | } | |
998 | ||
999 | /* | |
1000 | * Now tell netlabel about the single label nature of | |
1001 | * this host so that incoming packets get labeled. | |
4303154e | 1002 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1003 | */ |
4303154e | 1004 | if (rc == 0 && sp != smack_cipso_option) |
6d3dc07c CS |
1005 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
1006 | &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, | |
1007 | smack_to_secid(skp->smk_label), &audit_info); | |
1008 | ||
1009 | if (rc == 0) | |
1010 | rc = count; | |
1011 | ||
1012 | mutex_unlock(&smk_netlbladdr_lock); | |
1013 | ||
1014 | return rc; | |
1015 | } | |
1016 | ||
1017 | static const struct file_operations smk_netlbladdr_ops = { | |
1018 | .open = smk_open_netlbladdr, | |
1019 | .read = seq_read, | |
1020 | .llseek = seq_lseek, | |
1021 | .write = smk_write_netlbladdr, | |
1022 | .release = seq_release, | |
1023 | }; | |
1024 | ||
e114e473 CS |
1025 | /** |
1026 | * smk_read_doi - read() for /smack/doi | |
1027 | * @filp: file pointer, not actually used | |
1028 | * @buf: where to put the result | |
1029 | * @count: maximum to send along | |
1030 | * @ppos: where to start | |
1031 | * | |
1032 | * Returns number of bytes read or error code, as appropriate | |
1033 | */ | |
1034 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1035 | size_t count, loff_t *ppos) | |
1036 | { | |
1037 | char temp[80]; | |
1038 | ssize_t rc; | |
1039 | ||
1040 | if (*ppos != 0) | |
1041 | return 0; | |
1042 | ||
1043 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1044 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1045 | ||
1046 | return rc; | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1051 | * @file: file pointer, not actually used |
e114e473 CS |
1052 | * @buf: where to get the data from |
1053 | * @count: bytes sent | |
1054 | * @ppos: where to start | |
1055 | * | |
1056 | * Returns number of bytes written or error code, as appropriate | |
1057 | */ | |
1058 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1059 | size_t count, loff_t *ppos) | |
1060 | { | |
1061 | char temp[80]; | |
1062 | int i; | |
1063 | ||
1064 | if (!capable(CAP_MAC_ADMIN)) | |
1065 | return -EPERM; | |
1066 | ||
1067 | if (count >= sizeof(temp) || count == 0) | |
1068 | return -EINVAL; | |
1069 | ||
1070 | if (copy_from_user(temp, buf, count) != 0) | |
1071 | return -EFAULT; | |
1072 | ||
1073 | temp[count] = '\0'; | |
1074 | ||
1075 | if (sscanf(temp, "%d", &i) != 1) | |
1076 | return -EINVAL; | |
1077 | ||
1078 | smk_cipso_doi_value = i; | |
1079 | ||
1080 | smk_cipso_doi(); | |
1081 | ||
1082 | return count; | |
1083 | } | |
1084 | ||
1085 | static const struct file_operations smk_doi_ops = { | |
1086 | .read = smk_read_doi, | |
1087 | .write = smk_write_doi, | |
6038f373 | 1088 | .llseek = default_llseek, |
e114e473 CS |
1089 | }; |
1090 | ||
1091 | /** | |
1092 | * smk_read_direct - read() for /smack/direct | |
1093 | * @filp: file pointer, not actually used | |
1094 | * @buf: where to put the result | |
1095 | * @count: maximum to send along | |
1096 | * @ppos: where to start | |
1097 | * | |
1098 | * Returns number of bytes read or error code, as appropriate | |
1099 | */ | |
1100 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1101 | size_t count, loff_t *ppos) | |
1102 | { | |
1103 | char temp[80]; | |
1104 | ssize_t rc; | |
1105 | ||
1106 | if (*ppos != 0) | |
1107 | return 0; | |
1108 | ||
1109 | sprintf(temp, "%d", smack_cipso_direct); | |
1110 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1111 | ||
1112 | return rc; | |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1117 | * @file: file pointer, not actually used |
e114e473 CS |
1118 | * @buf: where to get the data from |
1119 | * @count: bytes sent | |
1120 | * @ppos: where to start | |
1121 | * | |
1122 | * Returns number of bytes written or error code, as appropriate | |
1123 | */ | |
1124 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1125 | size_t count, loff_t *ppos) | |
1126 | { | |
1127 | char temp[80]; | |
1128 | int i; | |
1129 | ||
1130 | if (!capable(CAP_MAC_ADMIN)) | |
1131 | return -EPERM; | |
1132 | ||
1133 | if (count >= sizeof(temp) || count == 0) | |
1134 | return -EINVAL; | |
1135 | ||
1136 | if (copy_from_user(temp, buf, count) != 0) | |
1137 | return -EFAULT; | |
1138 | ||
1139 | temp[count] = '\0'; | |
1140 | ||
1141 | if (sscanf(temp, "%d", &i) != 1) | |
1142 | return -EINVAL; | |
1143 | ||
1144 | smack_cipso_direct = i; | |
1145 | ||
1146 | return count; | |
1147 | } | |
1148 | ||
1149 | static const struct file_operations smk_direct_ops = { | |
1150 | .read = smk_read_direct, | |
1151 | .write = smk_write_direct, | |
6038f373 | 1152 | .llseek = default_llseek, |
e114e473 CS |
1153 | }; |
1154 | ||
1155 | /** | |
1156 | * smk_read_ambient - read() for /smack/ambient | |
1157 | * @filp: file pointer, not actually used | |
1158 | * @buf: where to put the result | |
1159 | * @cn: maximum to send along | |
1160 | * @ppos: where to start | |
1161 | * | |
1162 | * Returns number of bytes read or error code, as appropriate | |
1163 | */ | |
1164 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1165 | size_t cn, loff_t *ppos) | |
1166 | { | |
1167 | ssize_t rc; | |
e114e473 CS |
1168 | int asize; |
1169 | ||
1170 | if (*ppos != 0) | |
1171 | return 0; | |
1172 | /* | |
1173 | * Being careful to avoid a problem in the case where | |
1174 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1175 | */ |
4bc87e62 | 1176 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1177 | |
4bc87e62 CS |
1178 | asize = strlen(smack_net_ambient) + 1; |
1179 | ||
1180 | if (cn >= asize) | |
1181 | rc = simple_read_from_buffer(buf, cn, ppos, | |
1182 | smack_net_ambient, asize); | |
1183 | else | |
1184 | rc = -EINVAL; | |
e114e473 | 1185 | |
4bc87e62 | 1186 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1187 | |
1188 | return rc; | |
1189 | } | |
1190 | ||
1191 | /** | |
1192 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1193 | * @file: file pointer, not actually used |
e114e473 CS |
1194 | * @buf: where to get the data from |
1195 | * @count: bytes sent | |
1196 | * @ppos: where to start | |
1197 | * | |
1198 | * Returns number of bytes written or error code, as appropriate | |
1199 | */ | |
1200 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1201 | size_t count, loff_t *ppos) | |
1202 | { | |
1203 | char in[SMK_LABELLEN]; | |
4bc87e62 | 1204 | char *oldambient; |
e114e473 CS |
1205 | char *smack; |
1206 | ||
1207 | if (!capable(CAP_MAC_ADMIN)) | |
1208 | return -EPERM; | |
1209 | ||
1210 | if (count >= SMK_LABELLEN) | |
1211 | return -EINVAL; | |
1212 | ||
1213 | if (copy_from_user(in, buf, count) != 0) | |
1214 | return -EFAULT; | |
1215 | ||
1216 | smack = smk_import(in, count); | |
1217 | if (smack == NULL) | |
1218 | return -EINVAL; | |
1219 | ||
4bc87e62 CS |
1220 | mutex_lock(&smack_ambient_lock); |
1221 | ||
1222 | oldambient = smack_net_ambient; | |
e114e473 | 1223 | smack_net_ambient = smack; |
4bc87e62 CS |
1224 | smk_unlbl_ambient(oldambient); |
1225 | ||
1226 | mutex_unlock(&smack_ambient_lock); | |
e114e473 CS |
1227 | |
1228 | return count; | |
1229 | } | |
1230 | ||
1231 | static const struct file_operations smk_ambient_ops = { | |
1232 | .read = smk_read_ambient, | |
1233 | .write = smk_write_ambient, | |
6038f373 | 1234 | .llseek = default_llseek, |
e114e473 CS |
1235 | }; |
1236 | ||
15446235 CS |
1237 | /** |
1238 | * smk_read_onlycap - read() for /smack/onlycap | |
1239 | * @filp: file pointer, not actually used | |
1240 | * @buf: where to put the result | |
1241 | * @cn: maximum to send along | |
1242 | * @ppos: where to start | |
1243 | * | |
1244 | * Returns number of bytes read or error code, as appropriate | |
1245 | */ | |
1246 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, | |
1247 | size_t cn, loff_t *ppos) | |
1248 | { | |
1249 | char *smack = ""; | |
1250 | ssize_t rc = -EINVAL; | |
1251 | int asize; | |
1252 | ||
1253 | if (*ppos != 0) | |
1254 | return 0; | |
1255 | ||
1256 | if (smack_onlycap != NULL) | |
1257 | smack = smack_onlycap; | |
1258 | ||
1259 | asize = strlen(smack) + 1; | |
1260 | ||
1261 | if (cn >= asize) | |
1262 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
1263 | ||
1264 | return rc; | |
1265 | } | |
1266 | ||
1267 | /** | |
1268 | * smk_write_onlycap - write() for /smack/onlycap | |
251a2a95 | 1269 | * @file: file pointer, not actually used |
15446235 CS |
1270 | * @buf: where to get the data from |
1271 | * @count: bytes sent | |
1272 | * @ppos: where to start | |
1273 | * | |
1274 | * Returns number of bytes written or error code, as appropriate | |
1275 | */ | |
1276 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
1277 | size_t count, loff_t *ppos) | |
1278 | { | |
1279 | char in[SMK_LABELLEN]; | |
676dac4b | 1280 | char *sp = smk_of_task(current->cred->security); |
15446235 CS |
1281 | |
1282 | if (!capable(CAP_MAC_ADMIN)) | |
1283 | return -EPERM; | |
1284 | ||
1285 | /* | |
1286 | * This can be done using smk_access() but is done | |
1287 | * explicitly for clarity. The smk_access() implementation | |
1288 | * would use smk_access(smack_onlycap, MAY_WRITE) | |
1289 | */ | |
1290 | if (smack_onlycap != NULL && smack_onlycap != sp) | |
1291 | return -EPERM; | |
1292 | ||
1293 | if (count >= SMK_LABELLEN) | |
1294 | return -EINVAL; | |
1295 | ||
1296 | if (copy_from_user(in, buf, count) != 0) | |
1297 | return -EFAULT; | |
1298 | ||
1299 | /* | |
1300 | * Should the null string be passed in unset the onlycap value. | |
1301 | * This seems like something to be careful with as usually | |
1302 | * smk_import only expects to return NULL for errors. It | |
1303 | * is usually the case that a nullstring or "\n" would be | |
1304 | * bad to pass to smk_import but in fact this is useful here. | |
1305 | */ | |
1306 | smack_onlycap = smk_import(in, count); | |
1307 | ||
1308 | return count; | |
1309 | } | |
1310 | ||
1311 | static const struct file_operations smk_onlycap_ops = { | |
1312 | .read = smk_read_onlycap, | |
1313 | .write = smk_write_onlycap, | |
6038f373 | 1314 | .llseek = default_llseek, |
15446235 CS |
1315 | }; |
1316 | ||
ecfcc53f EB |
1317 | /** |
1318 | * smk_read_logging - read() for /smack/logging | |
1319 | * @filp: file pointer, not actually used | |
1320 | * @buf: where to put the result | |
1321 | * @cn: maximum to send along | |
1322 | * @ppos: where to start | |
1323 | * | |
1324 | * Returns number of bytes read or error code, as appropriate | |
1325 | */ | |
1326 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
1327 | size_t count, loff_t *ppos) | |
1328 | { | |
1329 | char temp[32]; | |
1330 | ssize_t rc; | |
1331 | ||
1332 | if (*ppos != 0) | |
1333 | return 0; | |
1334 | ||
1335 | sprintf(temp, "%d\n", log_policy); | |
1336 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1337 | return rc; | |
1338 | } | |
1339 | ||
1340 | /** | |
1341 | * smk_write_logging - write() for /smack/logging | |
1342 | * @file: file pointer, not actually used | |
1343 | * @buf: where to get the data from | |
1344 | * @count: bytes sent | |
1345 | * @ppos: where to start | |
1346 | * | |
1347 | * Returns number of bytes written or error code, as appropriate | |
1348 | */ | |
1349 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
1350 | size_t count, loff_t *ppos) | |
1351 | { | |
1352 | char temp[32]; | |
1353 | int i; | |
1354 | ||
1355 | if (!capable(CAP_MAC_ADMIN)) | |
1356 | return -EPERM; | |
1357 | ||
1358 | if (count >= sizeof(temp) || count == 0) | |
1359 | return -EINVAL; | |
1360 | ||
1361 | if (copy_from_user(temp, buf, count) != 0) | |
1362 | return -EFAULT; | |
1363 | ||
1364 | temp[count] = '\0'; | |
1365 | ||
1366 | if (sscanf(temp, "%d", &i) != 1) | |
1367 | return -EINVAL; | |
1368 | if (i < 0 || i > 3) | |
1369 | return -EINVAL; | |
1370 | log_policy = i; | |
1371 | return count; | |
1372 | } | |
1373 | ||
1374 | ||
1375 | ||
1376 | static const struct file_operations smk_logging_ops = { | |
1377 | .read = smk_read_logging, | |
1378 | .write = smk_write_logging, | |
6038f373 | 1379 | .llseek = default_llseek, |
ecfcc53f | 1380 | }; |
7898e1f8 CS |
1381 | |
1382 | /* | |
1383 | * Seq_file read operations for /smack/load-self | |
1384 | */ | |
1385 | ||
1386 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
1387 | { | |
1388 | struct task_smack *tsp = current_security(); | |
1389 | ||
1390 | if (*pos == SEQ_READ_FINISHED) | |
1391 | return NULL; | |
1392 | if (list_empty(&tsp->smk_rules)) | |
1393 | return NULL; | |
1394 | return tsp->smk_rules.next; | |
1395 | } | |
1396 | ||
1397 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1398 | { | |
1399 | struct task_smack *tsp = current_security(); | |
1400 | struct list_head *list = v; | |
1401 | ||
1402 | if (list_is_last(list, &tsp->smk_rules)) { | |
1403 | *pos = SEQ_READ_FINISHED; | |
1404 | return NULL; | |
1405 | } | |
1406 | return list->next; | |
1407 | } | |
1408 | ||
1409 | static int load_self_seq_show(struct seq_file *s, void *v) | |
1410 | { | |
1411 | struct list_head *list = v; | |
1412 | struct smack_rule *srp = | |
1413 | list_entry(list, struct smack_rule, list); | |
1414 | ||
1415 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
1416 | (char *)srp->smk_object); | |
1417 | ||
1418 | seq_putc(s, ' '); | |
1419 | ||
1420 | if (srp->smk_access & MAY_READ) | |
1421 | seq_putc(s, 'r'); | |
1422 | if (srp->smk_access & MAY_WRITE) | |
1423 | seq_putc(s, 'w'); | |
1424 | if (srp->smk_access & MAY_EXEC) | |
1425 | seq_putc(s, 'x'); | |
1426 | if (srp->smk_access & MAY_APPEND) | |
1427 | seq_putc(s, 'a'); | |
1428 | if (srp->smk_access & MAY_TRANSMUTE) | |
1429 | seq_putc(s, 't'); | |
1430 | if (srp->smk_access == 0) | |
1431 | seq_putc(s, '-'); | |
1432 | ||
1433 | seq_putc(s, '\n'); | |
1434 | ||
1435 | return 0; | |
1436 | } | |
1437 | ||
1438 | static void load_self_seq_stop(struct seq_file *s, void *v) | |
1439 | { | |
1440 | /* No-op */ | |
1441 | } | |
1442 | ||
1443 | static const struct seq_operations load_self_seq_ops = { | |
1444 | .start = load_self_seq_start, | |
1445 | .next = load_self_seq_next, | |
1446 | .show = load_self_seq_show, | |
1447 | .stop = load_self_seq_stop, | |
1448 | }; | |
1449 | ||
1450 | ||
1451 | /** | |
1452 | * smk_open_load_self - open() for /smack/load-self | |
1453 | * @inode: inode structure representing file | |
1454 | * @file: "load" file pointer | |
1455 | * | |
1456 | * For reading, use load_seq_* seq_file reading operations. | |
1457 | */ | |
1458 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
1459 | { | |
1460 | return seq_open(file, &load_self_seq_ops); | |
1461 | } | |
1462 | ||
1463 | /** | |
1464 | * smk_write_load_self - write() for /smack/load-self | |
1465 | * @file: file pointer, not actually used | |
1466 | * @buf: where to get the data from | |
1467 | * @count: bytes sent | |
1468 | * @ppos: where to start - must be 0 | |
1469 | * | |
1470 | */ | |
1471 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
1472 | size_t count, loff_t *ppos) | |
1473 | { | |
1474 | struct task_smack *tsp = current_security(); | |
1475 | ||
1476 | return smk_write_load_list(file, buf, count, ppos, &tsp->smk_rules, | |
1477 | &tsp->smk_rules_lock); | |
1478 | } | |
1479 | ||
1480 | static const struct file_operations smk_load_self_ops = { | |
1481 | .open = smk_open_load_self, | |
1482 | .read = seq_read, | |
1483 | .llseek = seq_lseek, | |
1484 | .write = smk_write_load_self, | |
1485 | .release = seq_release, | |
1486 | }; | |
828716c2 JS |
1487 | |
1488 | /** | |
1489 | * smk_write_access - handle access check transaction | |
1490 | * @file: file pointer | |
1491 | * @buf: data from user space | |
1492 | * @count: bytes sent | |
1493 | * @ppos: where to start - must be 0 | |
1494 | */ | |
1495 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
1496 | size_t count, loff_t *ppos) | |
1497 | { | |
1498 | struct smack_rule rule; | |
1499 | char *data; | |
f8859d98 | 1500 | int res; |
828716c2 JS |
1501 | |
1502 | if (!capable(CAP_MAC_ADMIN)) | |
1503 | return -EPERM; | |
1504 | ||
1505 | data = simple_transaction_get(file, buf, count); | |
1506 | if (IS_ERR(data)) | |
1507 | return PTR_ERR(data); | |
1508 | ||
1509 | if (count < SMK_LOADLEN || smk_parse_rule(data, &rule)) | |
1510 | return -EINVAL; | |
1511 | ||
f8859d98 JS |
1512 | res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access, |
1513 | NULL); | |
1514 | data[0] = res == 0 ? '1' : '0'; | |
1515 | data[1] = '\0'; | |
828716c2 | 1516 | |
d86b2b61 | 1517 | simple_transaction_set(file, 2); |
828716c2 JS |
1518 | return SMK_LOADLEN; |
1519 | } | |
1520 | ||
1521 | static const struct file_operations smk_access_ops = { | |
1522 | .write = smk_write_access, | |
1523 | .read = simple_transaction_read, | |
1524 | .release = simple_transaction_release, | |
1525 | .llseek = generic_file_llseek, | |
1526 | }; | |
1527 | ||
e114e473 CS |
1528 | /** |
1529 | * smk_fill_super - fill the /smackfs superblock | |
1530 | * @sb: the empty superblock | |
1531 | * @data: unused | |
1532 | * @silent: unused | |
1533 | * | |
1534 | * Fill in the well known entries for /smack | |
1535 | * | |
1536 | * Returns 0 on success, an error code on failure | |
1537 | */ | |
1538 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
1539 | { | |
1540 | int rc; | |
1541 | struct inode *root_inode; | |
1542 | ||
1543 | static struct tree_descr smack_files[] = { | |
7898e1f8 CS |
1544 | [SMK_LOAD] = { |
1545 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
1546 | [SMK_CIPSO] = { | |
1547 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
1548 | [SMK_DOI] = { | |
1549 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
1550 | [SMK_DIRECT] = { | |
1551 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
1552 | [SMK_AMBIENT] = { | |
1553 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
1554 | [SMK_NETLBLADDR] = { | |
1555 | "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, | |
1556 | [SMK_ONLYCAP] = { | |
1557 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
1558 | [SMK_LOGGING] = { | |
1559 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
1560 | [SMK_LOAD_SELF] = { | |
1561 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
828716c2 JS |
1562 | [SMK_ACCESSES] = { |
1563 | "access", &smk_access_ops, S_IRUGO|S_IWUSR}, | |
7898e1f8 CS |
1564 | /* last one */ |
1565 | {""} | |
e114e473 CS |
1566 | }; |
1567 | ||
1568 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
1569 | if (rc != 0) { | |
1570 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
1571 | __func__, rc); | |
1572 | return rc; | |
1573 | } | |
1574 | ||
1575 | root_inode = sb->s_root->d_inode; | |
1576 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); | |
1577 | ||
1578 | return 0; | |
1579 | } | |
1580 | ||
1581 | /** | |
fc14f2fe | 1582 | * smk_mount - get the smackfs superblock |
e114e473 CS |
1583 | * @fs_type: passed along without comment |
1584 | * @flags: passed along without comment | |
1585 | * @dev_name: passed along without comment | |
1586 | * @data: passed along without comment | |
e114e473 CS |
1587 | * |
1588 | * Just passes everything along. | |
1589 | * | |
1590 | * Returns what the lower level code does. | |
1591 | */ | |
fc14f2fe AV |
1592 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
1593 | int flags, const char *dev_name, void *data) | |
e114e473 | 1594 | { |
fc14f2fe | 1595 | return mount_single(fs_type, flags, data, smk_fill_super); |
e114e473 CS |
1596 | } |
1597 | ||
1598 | static struct file_system_type smk_fs_type = { | |
1599 | .name = "smackfs", | |
fc14f2fe | 1600 | .mount = smk_mount, |
e114e473 CS |
1601 | .kill_sb = kill_litter_super, |
1602 | }; | |
1603 | ||
1604 | static struct vfsmount *smackfs_mount; | |
1605 | ||
1606 | /** | |
1607 | * init_smk_fs - get the smackfs superblock | |
1608 | * | |
1609 | * register the smackfs | |
1610 | * | |
076c54c5 AD |
1611 | * Do not register smackfs if Smack wasn't enabled |
1612 | * on boot. We can not put this method normally under the | |
1613 | * smack_init() code path since the security subsystem get | |
1614 | * initialized before the vfs caches. | |
1615 | * | |
1616 | * Returns true if we were not chosen on boot or if | |
1617 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
1618 | */ |
1619 | static int __init init_smk_fs(void) | |
1620 | { | |
1621 | int err; | |
1622 | ||
076c54c5 AD |
1623 | if (!security_module_enable(&smack_ops)) |
1624 | return 0; | |
1625 | ||
e114e473 CS |
1626 | err = register_filesystem(&smk_fs_type); |
1627 | if (!err) { | |
1628 | smackfs_mount = kern_mount(&smk_fs_type); | |
1629 | if (IS_ERR(smackfs_mount)) { | |
1630 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
1631 | err = PTR_ERR(smackfs_mount); | |
1632 | smackfs_mount = NULL; | |
1633 | } | |
1634 | } | |
1635 | ||
e114e473 | 1636 | smk_cipso_doi(); |
4bc87e62 | 1637 | smk_unlbl_ambient(NULL); |
e114e473 | 1638 | |
272cd7a8 CS |
1639 | mutex_init(&smack_known_floor.smk_rules_lock); |
1640 | mutex_init(&smack_known_hat.smk_rules_lock); | |
1641 | mutex_init(&smack_known_huh.smk_rules_lock); | |
1642 | mutex_init(&smack_known_invalid.smk_rules_lock); | |
1643 | mutex_init(&smack_known_star.smk_rules_lock); | |
1644 | mutex_init(&smack_known_web.smk_rules_lock); | |
1645 | ||
1646 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
1647 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
1648 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
1649 | INIT_LIST_HEAD(&smack_known_invalid.smk_rules); | |
1650 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
1651 | INIT_LIST_HEAD(&smack_known_web.smk_rules); | |
1652 | ||
e114e473 CS |
1653 | return err; |
1654 | } | |
1655 | ||
1656 | __initcall(init_smk_fs); |