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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 */ |
e114e473 CS |
46 | }; |
47 | ||
48 | /* | |
49 | * List locks | |
50 | */ | |
51 | static DEFINE_MUTEX(smack_list_lock); | |
52 | static DEFINE_MUTEX(smack_cipso_lock); | |
4bc87e62 | 53 | static DEFINE_MUTEX(smack_ambient_lock); |
6d3dc07c | 54 | static DEFINE_MUTEX(smk_netlbladdr_lock); |
e114e473 CS |
55 | |
56 | /* | |
57 | * This is the "ambient" label for network traffic. | |
58 | * If it isn't somehow marked, use this. | |
59 | * It can be reset via smackfs/ambient | |
60 | */ | |
61 | char *smack_net_ambient = smack_known_floor.smk_known; | |
62 | ||
e114e473 CS |
63 | /* |
64 | * This is the level in a CIPSO header that indicates a | |
65 | * smack label is contained directly in the category set. | |
66 | * It can be reset via smackfs/direct | |
67 | */ | |
68 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
69 | ||
15446235 CS |
70 | /* |
71 | * Unless a process is running with this label even | |
72 | * having CAP_MAC_OVERRIDE isn't enough to grant | |
73 | * privilege to violate MAC policy. If no label is | |
74 | * designated (the NULL case) capabilities apply to | |
75 | * everyone. It is expected that the hat (^) label | |
76 | * will be used if any label is used. | |
77 | */ | |
78 | char *smack_onlycap; | |
79 | ||
6d3dc07c CS |
80 | /* |
81 | * Certain IP addresses may be designated as single label hosts. | |
82 | * Packets are sent there unlabeled, but only from tasks that | |
83 | * can write to the specified label. | |
84 | */ | |
7198e2ee EB |
85 | |
86 | LIST_HEAD(smk_netlbladdr_list); | |
87 | LIST_HEAD(smack_rule_list); | |
6d3dc07c | 88 | |
e114e473 | 89 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 90 | |
4303154e EB |
91 | const char *smack_cipso_option = SMACK_CIPSO_OPTION; |
92 | ||
93 | ||
e114e473 CS |
94 | #define SEQ_READ_FINISHED 1 |
95 | ||
e114e473 CS |
96 | /* |
97 | * Values for parsing cipso rules | |
98 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
99 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
100 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
101 | */ |
102 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
103 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
104 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
105 | ||
106 | /* | |
107 | * Values for parsing MAC rules | |
108 | * SMK_ACCESS: Maximum possible combination of access permissions | |
109 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
110 | * SMK_LOADLEN: Smack rule length | |
111 | */ | |
112 | #define SMK_ACCESS "rwxa" | |
113 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
114 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
115 | ||
6d3dc07c CS |
116 | /** |
117 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
118 | * @nap: structure to fill | |
119 | */ | |
120 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
121 | { | |
122 | nap->loginuid = audit_get_loginuid(current); | |
123 | nap->sessionid = audit_get_sessionid(current); | |
124 | nap->secid = smack_to_secid(current_security()); | |
125 | } | |
126 | ||
127 | /* | |
128 | * Values for parsing single label host rules | |
129 | * "1.2.3.4 X" | |
130 | * "192.168.138.129/32 abcdefghijklmnopqrstuvw" | |
131 | */ | |
132 | #define SMK_NETLBLADDRMIN 9 | |
133 | #define SMK_NETLBLADDRMAX 42 | |
e114e473 CS |
134 | |
135 | /* | |
136 | * Seq_file read operations for /smack/load | |
137 | */ | |
138 | ||
139 | static void *load_seq_start(struct seq_file *s, loff_t *pos) | |
140 | { | |
141 | if (*pos == SEQ_READ_FINISHED) | |
142 | return NULL; | |
7198e2ee EB |
143 | if (list_empty(&smack_rule_list)) |
144 | return NULL; | |
145 | return smack_rule_list.next; | |
e114e473 CS |
146 | } |
147 | ||
148 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
149 | { | |
7198e2ee | 150 | struct list_head *list = v; |
e114e473 | 151 | |
7198e2ee | 152 | if (list_is_last(list, &smack_rule_list)) { |
e114e473 | 153 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
154 | return NULL; |
155 | } | |
156 | return list->next; | |
e114e473 CS |
157 | } |
158 | ||
159 | static int load_seq_show(struct seq_file *s, void *v) | |
160 | { | |
7198e2ee EB |
161 | struct list_head *list = v; |
162 | struct smack_rule *srp = | |
163 | list_entry(list, struct smack_rule, list); | |
e114e473 CS |
164 | |
165 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
166 | (char *)srp->smk_object); | |
167 | ||
168 | seq_putc(s, ' '); | |
169 | ||
170 | if (srp->smk_access & MAY_READ) | |
171 | seq_putc(s, 'r'); | |
172 | if (srp->smk_access & MAY_WRITE) | |
173 | seq_putc(s, 'w'); | |
174 | if (srp->smk_access & MAY_EXEC) | |
175 | seq_putc(s, 'x'); | |
176 | if (srp->smk_access & MAY_APPEND) | |
177 | seq_putc(s, 'a'); | |
178 | if (srp->smk_access == 0) | |
179 | seq_putc(s, '-'); | |
180 | ||
181 | seq_putc(s, '\n'); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static void load_seq_stop(struct seq_file *s, void *v) | |
187 | { | |
188 | /* No-op */ | |
189 | } | |
190 | ||
88e9d34c | 191 | static const struct seq_operations load_seq_ops = { |
e114e473 CS |
192 | .start = load_seq_start, |
193 | .next = load_seq_next, | |
194 | .show = load_seq_show, | |
195 | .stop = load_seq_stop, | |
196 | }; | |
197 | ||
198 | /** | |
199 | * smk_open_load - open() for /smack/load | |
200 | * @inode: inode structure representing file | |
201 | * @file: "load" file pointer | |
202 | * | |
203 | * For reading, use load_seq_* seq_file reading operations. | |
204 | */ | |
205 | static int smk_open_load(struct inode *inode, struct file *file) | |
206 | { | |
cb622bbb | 207 | return seq_open(file, &load_seq_ops); |
e114e473 CS |
208 | } |
209 | ||
210 | /** | |
211 | * smk_set_access - add a rule to the rule list | |
212 | * @srp: the new rule to add | |
213 | * | |
214 | * Looks through the current subject/object/access list for | |
215 | * the subject/object pair and replaces the access that was | |
216 | * there. If the pair isn't found add it with the specified | |
217 | * access. | |
81ea714b SL |
218 | * |
219 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails | |
220 | * during the allocation of the new pair to add. | |
e114e473 | 221 | */ |
81ea714b | 222 | static int smk_set_access(struct smack_rule *srp) |
e114e473 | 223 | { |
7198e2ee | 224 | struct smack_rule *sp; |
81ea714b | 225 | int ret = 0; |
7198e2ee | 226 | int found; |
e114e473 CS |
227 | mutex_lock(&smack_list_lock); |
228 | ||
7198e2ee EB |
229 | found = 0; |
230 | list_for_each_entry_rcu(sp, &smack_rule_list, list) { | |
231 | if (sp->smk_subject == srp->smk_subject && | |
232 | sp->smk_object == srp->smk_object) { | |
233 | found = 1; | |
234 | sp->smk_access = srp->smk_access; | |
e114e473 CS |
235 | break; |
236 | } | |
e114e473 | 237 | } |
7198e2ee EB |
238 | if (found == 0) |
239 | list_add_rcu(&srp->list, &smack_rule_list); | |
e114e473 CS |
240 | |
241 | mutex_unlock(&smack_list_lock); | |
242 | ||
81ea714b | 243 | return ret; |
e114e473 CS |
244 | } |
245 | ||
246 | /** | |
247 | * smk_write_load - write() for /smack/load | |
251a2a95 | 248 | * @file: file pointer, not actually used |
e114e473 CS |
249 | * @buf: where to get the data from |
250 | * @count: bytes sent | |
251 | * @ppos: where to start - must be 0 | |
252 | * | |
253 | * Get one smack access rule from above. | |
254 | * The format is exactly: | |
255 | * char subject[SMK_LABELLEN] | |
256 | * char object[SMK_LABELLEN] | |
b500ce8d | 257 | * char access[SMK_ACCESSLEN] |
e114e473 | 258 | * |
b500ce8d | 259 | * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. |
e114e473 | 260 | */ |
e114e473 CS |
261 | static ssize_t smk_write_load(struct file *file, const char __user *buf, |
262 | size_t count, loff_t *ppos) | |
263 | { | |
7198e2ee | 264 | struct smack_rule *rule; |
e114e473 CS |
265 | char *data; |
266 | int rc = -EINVAL; | |
267 | ||
268 | /* | |
269 | * Must have privilege. | |
270 | * No partial writes. | |
271 | * Enough data must be present. | |
272 | */ | |
273 | if (!capable(CAP_MAC_ADMIN)) | |
274 | return -EPERM; | |
7198e2ee EB |
275 | |
276 | if (*ppos != 0 || count != SMK_LOADLEN) | |
e114e473 CS |
277 | return -EINVAL; |
278 | ||
279 | data = kzalloc(count, GFP_KERNEL); | |
280 | if (data == NULL) | |
281 | return -ENOMEM; | |
282 | ||
283 | if (copy_from_user(data, buf, count) != 0) { | |
284 | rc = -EFAULT; | |
285 | goto out; | |
286 | } | |
287 | ||
7198e2ee EB |
288 | rule = kzalloc(sizeof(*rule), GFP_KERNEL); |
289 | if (rule == NULL) { | |
290 | rc = -ENOMEM; | |
e114e473 | 291 | goto out; |
7198e2ee | 292 | } |
e114e473 | 293 | |
7198e2ee EB |
294 | rule->smk_subject = smk_import(data, 0); |
295 | if (rule->smk_subject == NULL) | |
296 | goto out_free_rule; | |
e114e473 | 297 | |
7198e2ee EB |
298 | rule->smk_object = smk_import(data + SMK_LABELLEN, 0); |
299 | if (rule->smk_object == NULL) | |
300 | goto out_free_rule; | |
301 | ||
302 | rule->smk_access = 0; | |
e114e473 CS |
303 | |
304 | switch (data[SMK_LABELLEN + SMK_LABELLEN]) { | |
305 | case '-': | |
306 | break; | |
307 | case 'r': | |
308 | case 'R': | |
7198e2ee | 309 | rule->smk_access |= MAY_READ; |
e114e473 CS |
310 | break; |
311 | default: | |
7198e2ee | 312 | goto out_free_rule; |
e114e473 CS |
313 | } |
314 | ||
315 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { | |
316 | case '-': | |
317 | break; | |
318 | case 'w': | |
319 | case 'W': | |
7198e2ee | 320 | rule->smk_access |= MAY_WRITE; |
e114e473 CS |
321 | break; |
322 | default: | |
7198e2ee | 323 | goto out_free_rule; |
e114e473 CS |
324 | } |
325 | ||
326 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { | |
327 | case '-': | |
328 | break; | |
329 | case 'x': | |
330 | case 'X': | |
7198e2ee | 331 | rule->smk_access |= MAY_EXEC; |
e114e473 CS |
332 | break; |
333 | default: | |
7198e2ee | 334 | goto out_free_rule; |
e114e473 CS |
335 | } |
336 | ||
337 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { | |
338 | case '-': | |
339 | break; | |
340 | case 'a': | |
341 | case 'A': | |
7198e2ee | 342 | rule->smk_access |= MAY_APPEND; |
e114e473 CS |
343 | break; |
344 | default: | |
7198e2ee | 345 | goto out_free_rule; |
e114e473 CS |
346 | } |
347 | ||
7198e2ee | 348 | rc = smk_set_access(rule); |
81ea714b SL |
349 | |
350 | if (!rc) | |
351 | rc = count; | |
7198e2ee | 352 | goto out; |
e114e473 | 353 | |
7198e2ee EB |
354 | out_free_rule: |
355 | kfree(rule); | |
e114e473 CS |
356 | out: |
357 | kfree(data); | |
358 | return rc; | |
359 | } | |
360 | ||
361 | static const struct file_operations smk_load_ops = { | |
362 | .open = smk_open_load, | |
363 | .read = seq_read, | |
364 | .llseek = seq_lseek, | |
365 | .write = smk_write_load, | |
cb622bbb | 366 | .release = seq_release, |
e114e473 CS |
367 | }; |
368 | ||
369 | /** | |
370 | * smk_cipso_doi - initialize the CIPSO domain | |
371 | */ | |
30aa4faf | 372 | static void smk_cipso_doi(void) |
e114e473 CS |
373 | { |
374 | int rc; | |
375 | struct cipso_v4_doi *doip; | |
6d3dc07c | 376 | struct netlbl_audit nai; |
e114e473 | 377 | |
6d3dc07c | 378 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 379 | |
6d3dc07c | 380 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
381 | if (rc != 0) |
382 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
383 | __func__, __LINE__, rc); | |
384 | ||
385 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
386 | if (doip == NULL) | |
387 | panic("smack: Failed to initialize cipso DOI.\n"); | |
388 | doip->map.std = NULL; | |
389 | doip->doi = smk_cipso_doi_value; | |
390 | doip->type = CIPSO_V4_MAP_PASS; | |
391 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
392 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
393 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
394 | ||
6d3dc07c | 395 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 396 | if (rc != 0) { |
6c2e8ac0 PM |
397 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
398 | __func__, __LINE__, rc); | |
399 | kfree(doip); | |
400 | return; | |
401 | } | |
6d3dc07c | 402 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
403 | if (rc != 0) { |
404 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 405 | __func__, __LINE__, rc); |
b1edeb10 | 406 | kfree(doip); |
6c2e8ac0 | 407 | return; |
b1edeb10 | 408 | } |
e114e473 CS |
409 | } |
410 | ||
4bc87e62 CS |
411 | /** |
412 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 413 | * @oldambient: previous domain string |
4bc87e62 | 414 | */ |
30aa4faf | 415 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
416 | { |
417 | int rc; | |
6d3dc07c | 418 | struct netlbl_audit nai; |
4bc87e62 | 419 | |
6d3dc07c | 420 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
421 | |
422 | if (oldambient != NULL) { | |
6d3dc07c | 423 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
424 | if (rc != 0) |
425 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
426 | __func__, __LINE__, rc); | |
427 | } | |
428 | ||
6d3dc07c CS |
429 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET, |
430 | NULL, NULL, &nai); | |
4bc87e62 CS |
431 | if (rc != 0) |
432 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
433 | __func__, __LINE__, rc); | |
434 | } | |
435 | ||
e114e473 CS |
436 | /* |
437 | * Seq_file read operations for /smack/cipso | |
438 | */ | |
439 | ||
440 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
441 | { | |
442 | if (*pos == SEQ_READ_FINISHED) | |
443 | return NULL; | |
7198e2ee EB |
444 | if (list_empty(&smack_known_list)) |
445 | return NULL; | |
e114e473 | 446 | |
7198e2ee | 447 | return smack_known_list.next; |
e114e473 CS |
448 | } |
449 | ||
450 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
451 | { | |
7198e2ee | 452 | struct list_head *list = v; |
e114e473 CS |
453 | |
454 | /* | |
7198e2ee EB |
455 | * labels with no associated cipso value wont be printed |
456 | * in cipso_seq_show | |
e114e473 | 457 | */ |
7198e2ee | 458 | if (list_is_last(list, &smack_known_list)) { |
e114e473 | 459 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
460 | return NULL; |
461 | } | |
e114e473 | 462 | |
7198e2ee | 463 | return list->next; |
e114e473 CS |
464 | } |
465 | ||
466 | /* | |
467 | * Print cipso labels in format: | |
468 | * label level[/cat[,cat]] | |
469 | */ | |
470 | static int cipso_seq_show(struct seq_file *s, void *v) | |
471 | { | |
7198e2ee EB |
472 | struct list_head *list = v; |
473 | struct smack_known *skp = | |
474 | list_entry(list, struct smack_known, list); | |
e114e473 CS |
475 | struct smack_cipso *scp = skp->smk_cipso; |
476 | char *cbp; | |
477 | char sep = '/'; | |
478 | int cat = 1; | |
479 | int i; | |
480 | unsigned char m; | |
481 | ||
482 | if (scp == NULL) | |
483 | return 0; | |
484 | ||
485 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); | |
486 | ||
487 | cbp = scp->smk_catset; | |
488 | for (i = 0; i < SMK_LABELLEN; i++) | |
489 | for (m = 0x80; m != 0; m >>= 1) { | |
490 | if (m & cbp[i]) { | |
491 | seq_printf(s, "%c%d", sep, cat); | |
492 | sep = ','; | |
493 | } | |
494 | cat++; | |
495 | } | |
496 | ||
497 | seq_putc(s, '\n'); | |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
502 | static void cipso_seq_stop(struct seq_file *s, void *v) | |
503 | { | |
504 | /* No-op */ | |
505 | } | |
506 | ||
88e9d34c | 507 | static const struct seq_operations cipso_seq_ops = { |
e114e473 CS |
508 | .start = cipso_seq_start, |
509 | .stop = cipso_seq_stop, | |
510 | .next = cipso_seq_next, | |
511 | .show = cipso_seq_show, | |
512 | }; | |
513 | ||
514 | /** | |
515 | * smk_open_cipso - open() for /smack/cipso | |
516 | * @inode: inode structure representing file | |
517 | * @file: "cipso" file pointer | |
518 | * | |
519 | * Connect our cipso_seq_* operations with /smack/cipso | |
520 | * file_operations | |
521 | */ | |
522 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
523 | { | |
524 | return seq_open(file, &cipso_seq_ops); | |
525 | } | |
526 | ||
527 | /** | |
528 | * smk_write_cipso - write() for /smack/cipso | |
251a2a95 | 529 | * @file: file pointer, not actually used |
e114e473 CS |
530 | * @buf: where to get the data from |
531 | * @count: bytes sent | |
532 | * @ppos: where to start | |
533 | * | |
534 | * Accepts only one cipso rule per write call. | |
535 | * Returns number of bytes written or error code, as appropriate | |
536 | */ | |
537 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
538 | size_t count, loff_t *ppos) | |
539 | { | |
540 | struct smack_known *skp; | |
541 | struct smack_cipso *scp = NULL; | |
542 | char mapcatset[SMK_LABELLEN]; | |
543 | int maplevel; | |
544 | int cat; | |
545 | int catlen; | |
546 | ssize_t rc = -EINVAL; | |
547 | char *data = NULL; | |
548 | char *rule; | |
549 | int ret; | |
550 | int i; | |
551 | ||
552 | /* | |
553 | * Must have privilege. | |
554 | * No partial writes. | |
555 | * Enough data must be present. | |
556 | */ | |
557 | if (!capable(CAP_MAC_ADMIN)) | |
558 | return -EPERM; | |
559 | if (*ppos != 0) | |
560 | return -EINVAL; | |
b500ce8d | 561 | if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) |
e114e473 CS |
562 | return -EINVAL; |
563 | ||
564 | data = kzalloc(count + 1, GFP_KERNEL); | |
565 | if (data == NULL) | |
566 | return -ENOMEM; | |
567 | ||
568 | if (copy_from_user(data, buf, count) != 0) { | |
569 | rc = -EFAULT; | |
570 | goto unlockedout; | |
571 | } | |
572 | ||
4303154e EB |
573 | /* labels cannot begin with a '-' */ |
574 | if (data[0] == '-') { | |
575 | rc = -EINVAL; | |
576 | goto unlockedout; | |
577 | } | |
e114e473 CS |
578 | data[count] = '\0'; |
579 | rule = data; | |
580 | /* | |
581 | * Only allow one writer at a time. Writes should be | |
582 | * quite rare and small in any case. | |
583 | */ | |
584 | mutex_lock(&smack_cipso_lock); | |
585 | ||
586 | skp = smk_import_entry(rule, 0); | |
587 | if (skp == NULL) | |
588 | goto out; | |
589 | ||
c19a28e1 | 590 | rule += SMK_LABELLEN; |
e114e473 CS |
591 | ret = sscanf(rule, "%d", &maplevel); |
592 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
593 | goto out; | |
594 | ||
595 | rule += SMK_DIGITLEN; | |
596 | ret = sscanf(rule, "%d", &catlen); | |
597 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
598 | goto out; | |
599 | ||
b500ce8d | 600 | if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
e114e473 CS |
601 | goto out; |
602 | ||
603 | memset(mapcatset, 0, sizeof(mapcatset)); | |
604 | ||
605 | for (i = 0; i < catlen; i++) { | |
606 | rule += SMK_DIGITLEN; | |
607 | ret = sscanf(rule, "%d", &cat); | |
608 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) | |
609 | goto out; | |
610 | ||
611 | smack_catset_bit(cat, mapcatset); | |
612 | } | |
613 | ||
614 | if (skp->smk_cipso == NULL) { | |
615 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); | |
616 | if (scp == NULL) { | |
617 | rc = -ENOMEM; | |
618 | goto out; | |
619 | } | |
620 | } | |
621 | ||
622 | spin_lock_bh(&skp->smk_cipsolock); | |
623 | ||
624 | if (scp == NULL) | |
625 | scp = skp->smk_cipso; | |
626 | else | |
627 | skp->smk_cipso = scp; | |
628 | ||
629 | scp->smk_level = maplevel; | |
630 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); | |
631 | ||
632 | spin_unlock_bh(&skp->smk_cipsolock); | |
633 | ||
634 | rc = count; | |
635 | out: | |
636 | mutex_unlock(&smack_cipso_lock); | |
637 | unlockedout: | |
638 | kfree(data); | |
639 | return rc; | |
640 | } | |
641 | ||
642 | static const struct file_operations smk_cipso_ops = { | |
643 | .open = smk_open_cipso, | |
644 | .read = seq_read, | |
645 | .llseek = seq_lseek, | |
646 | .write = smk_write_cipso, | |
647 | .release = seq_release, | |
648 | }; | |
649 | ||
6d3dc07c CS |
650 | /* |
651 | * Seq_file read operations for /smack/netlabel | |
652 | */ | |
653 | ||
654 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) | |
655 | { | |
656 | if (*pos == SEQ_READ_FINISHED) | |
657 | return NULL; | |
7198e2ee EB |
658 | if (list_empty(&smk_netlbladdr_list)) |
659 | return NULL; | |
660 | return smk_netlbladdr_list.next; | |
6d3dc07c CS |
661 | } |
662 | ||
663 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
664 | { | |
7198e2ee | 665 | struct list_head *list = v; |
6d3dc07c | 666 | |
7198e2ee | 667 | if (list_is_last(list, &smk_netlbladdr_list)) { |
6d3dc07c | 668 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
669 | return NULL; |
670 | } | |
6d3dc07c | 671 | |
7198e2ee | 672 | return list->next; |
6d3dc07c | 673 | } |
6d3dc07c CS |
674 | #define BEBITS (sizeof(__be32) * 8) |
675 | ||
676 | /* | |
677 | * Print host/label pairs | |
678 | */ | |
679 | static int netlbladdr_seq_show(struct seq_file *s, void *v) | |
680 | { | |
7198e2ee EB |
681 | struct list_head *list = v; |
682 | struct smk_netlbladdr *skp = | |
683 | list_entry(list, struct smk_netlbladdr, list); | |
6d3dc07c | 684 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
113a0e45 | 685 | int maskn; |
686 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); | |
6d3dc07c | 687 | |
113a0e45 | 688 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
6d3dc07c CS |
689 | |
690 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", | |
691 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); | |
692 | ||
693 | return 0; | |
694 | } | |
695 | ||
696 | static void netlbladdr_seq_stop(struct seq_file *s, void *v) | |
697 | { | |
698 | /* No-op */ | |
699 | } | |
700 | ||
88e9d34c | 701 | static const struct seq_operations netlbladdr_seq_ops = { |
6d3dc07c CS |
702 | .start = netlbladdr_seq_start, |
703 | .stop = netlbladdr_seq_stop, | |
704 | .next = netlbladdr_seq_next, | |
705 | .show = netlbladdr_seq_show, | |
706 | }; | |
707 | ||
708 | /** | |
709 | * smk_open_netlbladdr - open() for /smack/netlabel | |
710 | * @inode: inode structure representing file | |
711 | * @file: "netlabel" file pointer | |
712 | * | |
713 | * Connect our netlbladdr_seq_* operations with /smack/netlabel | |
714 | * file_operations | |
715 | */ | |
716 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) | |
717 | { | |
718 | return seq_open(file, &netlbladdr_seq_ops); | |
719 | } | |
720 | ||
113a0e45 | 721 | /** |
722 | * smk_netlbladdr_insert | |
723 | * @new : netlabel to insert | |
724 | * | |
725 | * This helper insert netlabel in the smack_netlbladdrs list | |
726 | * sorted by netmask length (longest to smallest) | |
7198e2ee EB |
727 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
728 | * | |
113a0e45 | 729 | */ |
730 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) | |
731 | { | |
7198e2ee | 732 | struct smk_netlbladdr *m, *m_next; |
113a0e45 | 733 | |
7198e2ee EB |
734 | if (list_empty(&smk_netlbladdr_list)) { |
735 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 736 | return; |
737 | } | |
738 | ||
05725f7e JP |
739 | m = list_entry_rcu(smk_netlbladdr_list.next, |
740 | struct smk_netlbladdr, list); | |
7198e2ee | 741 | |
113a0e45 | 742 | /* the comparison '>' is a bit hacky, but works */ |
7198e2ee EB |
743 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
744 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 745 | return; |
746 | } | |
7198e2ee EB |
747 | |
748 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { | |
749 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { | |
750 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 751 | return; |
752 | } | |
05725f7e JP |
753 | m_next = list_entry_rcu(m->list.next, |
754 | struct smk_netlbladdr, list); | |
7198e2ee EB |
755 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { |
756 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 757 | return; |
758 | } | |
759 | } | |
760 | } | |
761 | ||
762 | ||
6d3dc07c CS |
763 | /** |
764 | * smk_write_netlbladdr - write() for /smack/netlabel | |
251a2a95 | 765 | * @file: file pointer, not actually used |
6d3dc07c CS |
766 | * @buf: where to get the data from |
767 | * @count: bytes sent | |
768 | * @ppos: where to start | |
769 | * | |
770 | * Accepts only one netlbladdr per write call. | |
771 | * Returns number of bytes written or error code, as appropriate | |
772 | */ | |
773 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, | |
774 | size_t count, loff_t *ppos) | |
775 | { | |
776 | struct smk_netlbladdr *skp; | |
777 | struct sockaddr_in newname; | |
778 | char smack[SMK_LABELLEN]; | |
779 | char *sp; | |
6470c077 | 780 | char data[SMK_NETLBLADDRMAX + 1]; |
6d3dc07c CS |
781 | char *host = (char *)&newname.sin_addr.s_addr; |
782 | int rc; | |
783 | struct netlbl_audit audit_info; | |
784 | struct in_addr mask; | |
785 | unsigned int m; | |
7198e2ee | 786 | int found; |
113a0e45 | 787 | u32 mask_bits = (1<<31); |
6d3dc07c | 788 | __be32 nsa; |
113a0e45 | 789 | u32 temp_mask; |
6d3dc07c CS |
790 | |
791 | /* | |
792 | * Must have privilege. | |
793 | * No partial writes. | |
794 | * Enough data must be present. | |
795 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
796 | * "<addr, as a.b.c.d><space><label>" | |
797 | */ | |
798 | if (!capable(CAP_MAC_ADMIN)) | |
799 | return -EPERM; | |
800 | if (*ppos != 0) | |
801 | return -EINVAL; | |
802 | if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX) | |
803 | return -EINVAL; | |
804 | if (copy_from_user(data, buf, count) != 0) | |
805 | return -EFAULT; | |
806 | ||
807 | data[count] = '\0'; | |
808 | ||
809 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", | |
810 | &host[0], &host[1], &host[2], &host[3], &m, smack); | |
811 | if (rc != 6) { | |
812 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
813 | &host[0], &host[1], &host[2], &host[3], smack); | |
814 | if (rc != 5) | |
815 | return -EINVAL; | |
816 | m = BEBITS; | |
817 | } | |
818 | if (m > BEBITS) | |
819 | return -EINVAL; | |
820 | ||
4303154e EB |
821 | /* if smack begins with '-', its an option, don't import it */ |
822 | if (smack[0] != '-') { | |
823 | sp = smk_import(smack, 0); | |
824 | if (sp == NULL) | |
825 | return -EINVAL; | |
826 | } else { | |
827 | /* check known options */ | |
828 | if (strcmp(smack, smack_cipso_option) == 0) | |
829 | sp = (char *)smack_cipso_option; | |
830 | else | |
831 | return -EINVAL; | |
832 | } | |
6d3dc07c | 833 | |
113a0e45 | 834 | for (temp_mask = 0; m > 0; m--) { |
835 | temp_mask |= mask_bits; | |
836 | mask_bits >>= 1; | |
6d3dc07c | 837 | } |
113a0e45 | 838 | mask.s_addr = cpu_to_be32(temp_mask); |
839 | ||
840 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
841 | /* |
842 | * Only allow one writer at a time. Writes should be | |
843 | * quite rare and small in any case. | |
844 | */ | |
845 | mutex_lock(&smk_netlbladdr_lock); | |
846 | ||
847 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 848 | /* try to find if the prefix is already in the list */ |
7198e2ee EB |
849 | found = 0; |
850 | list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { | |
6d3dc07c | 851 | if (skp->smk_host.sin_addr.s_addr == nsa && |
7198e2ee EB |
852 | skp->smk_mask.s_addr == mask.s_addr) { |
853 | found = 1; | |
6d3dc07c | 854 | break; |
7198e2ee EB |
855 | } |
856 | } | |
6d3dc07c CS |
857 | smk_netlabel_audit_set(&audit_info); |
858 | ||
7198e2ee | 859 | if (found == 0) { |
6d3dc07c CS |
860 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
861 | if (skp == NULL) | |
862 | rc = -ENOMEM; | |
863 | else { | |
864 | rc = 0; | |
865 | skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; | |
866 | skp->smk_mask.s_addr = mask.s_addr; | |
6d3dc07c | 867 | skp->smk_label = sp; |
113a0e45 | 868 | smk_netlbladdr_insert(skp); |
6d3dc07c CS |
869 | } |
870 | } else { | |
4303154e EB |
871 | /* we delete the unlabeled entry, only if the previous label |
872 | * wasnt the special CIPSO option */ | |
873 | if (skp->smk_label != smack_cipso_option) | |
874 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, | |
875 | &skp->smk_host.sin_addr, &skp->smk_mask, | |
876 | PF_INET, &audit_info); | |
877 | else | |
878 | rc = 0; | |
6d3dc07c CS |
879 | skp->smk_label = sp; |
880 | } | |
881 | ||
882 | /* | |
883 | * Now tell netlabel about the single label nature of | |
884 | * this host so that incoming packets get labeled. | |
4303154e | 885 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 886 | */ |
4303154e | 887 | if (rc == 0 && sp != smack_cipso_option) |
6d3dc07c CS |
888 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
889 | &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, | |
890 | smack_to_secid(skp->smk_label), &audit_info); | |
891 | ||
892 | if (rc == 0) | |
893 | rc = count; | |
894 | ||
895 | mutex_unlock(&smk_netlbladdr_lock); | |
896 | ||
897 | return rc; | |
898 | } | |
899 | ||
900 | static const struct file_operations smk_netlbladdr_ops = { | |
901 | .open = smk_open_netlbladdr, | |
902 | .read = seq_read, | |
903 | .llseek = seq_lseek, | |
904 | .write = smk_write_netlbladdr, | |
905 | .release = seq_release, | |
906 | }; | |
907 | ||
e114e473 CS |
908 | /** |
909 | * smk_read_doi - read() for /smack/doi | |
910 | * @filp: file pointer, not actually used | |
911 | * @buf: where to put the result | |
912 | * @count: maximum to send along | |
913 | * @ppos: where to start | |
914 | * | |
915 | * Returns number of bytes read or error code, as appropriate | |
916 | */ | |
917 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
918 | size_t count, loff_t *ppos) | |
919 | { | |
920 | char temp[80]; | |
921 | ssize_t rc; | |
922 | ||
923 | if (*ppos != 0) | |
924 | return 0; | |
925 | ||
926 | sprintf(temp, "%d", smk_cipso_doi_value); | |
927 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
928 | ||
929 | return rc; | |
930 | } | |
931 | ||
932 | /** | |
933 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 934 | * @file: file pointer, not actually used |
e114e473 CS |
935 | * @buf: where to get the data from |
936 | * @count: bytes sent | |
937 | * @ppos: where to start | |
938 | * | |
939 | * Returns number of bytes written or error code, as appropriate | |
940 | */ | |
941 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
942 | size_t count, loff_t *ppos) | |
943 | { | |
944 | char temp[80]; | |
945 | int i; | |
946 | ||
947 | if (!capable(CAP_MAC_ADMIN)) | |
948 | return -EPERM; | |
949 | ||
950 | if (count >= sizeof(temp) || count == 0) | |
951 | return -EINVAL; | |
952 | ||
953 | if (copy_from_user(temp, buf, count) != 0) | |
954 | return -EFAULT; | |
955 | ||
956 | temp[count] = '\0'; | |
957 | ||
958 | if (sscanf(temp, "%d", &i) != 1) | |
959 | return -EINVAL; | |
960 | ||
961 | smk_cipso_doi_value = i; | |
962 | ||
963 | smk_cipso_doi(); | |
964 | ||
965 | return count; | |
966 | } | |
967 | ||
968 | static const struct file_operations smk_doi_ops = { | |
969 | .read = smk_read_doi, | |
970 | .write = smk_write_doi, | |
6038f373 | 971 | .llseek = default_llseek, |
e114e473 CS |
972 | }; |
973 | ||
974 | /** | |
975 | * smk_read_direct - read() for /smack/direct | |
976 | * @filp: file pointer, not actually used | |
977 | * @buf: where to put the result | |
978 | * @count: maximum to send along | |
979 | * @ppos: where to start | |
980 | * | |
981 | * Returns number of bytes read or error code, as appropriate | |
982 | */ | |
983 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
984 | size_t count, loff_t *ppos) | |
985 | { | |
986 | char temp[80]; | |
987 | ssize_t rc; | |
988 | ||
989 | if (*ppos != 0) | |
990 | return 0; | |
991 | ||
992 | sprintf(temp, "%d", smack_cipso_direct); | |
993 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
994 | ||
995 | return rc; | |
996 | } | |
997 | ||
998 | /** | |
999 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1000 | * @file: file pointer, not actually used |
e114e473 CS |
1001 | * @buf: where to get the data from |
1002 | * @count: bytes sent | |
1003 | * @ppos: where to start | |
1004 | * | |
1005 | * Returns number of bytes written or error code, as appropriate | |
1006 | */ | |
1007 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1008 | size_t count, loff_t *ppos) | |
1009 | { | |
1010 | char temp[80]; | |
1011 | int i; | |
1012 | ||
1013 | if (!capable(CAP_MAC_ADMIN)) | |
1014 | return -EPERM; | |
1015 | ||
1016 | if (count >= sizeof(temp) || count == 0) | |
1017 | return -EINVAL; | |
1018 | ||
1019 | if (copy_from_user(temp, buf, count) != 0) | |
1020 | return -EFAULT; | |
1021 | ||
1022 | temp[count] = '\0'; | |
1023 | ||
1024 | if (sscanf(temp, "%d", &i) != 1) | |
1025 | return -EINVAL; | |
1026 | ||
1027 | smack_cipso_direct = i; | |
1028 | ||
1029 | return count; | |
1030 | } | |
1031 | ||
1032 | static const struct file_operations smk_direct_ops = { | |
1033 | .read = smk_read_direct, | |
1034 | .write = smk_write_direct, | |
6038f373 | 1035 | .llseek = default_llseek, |
e114e473 CS |
1036 | }; |
1037 | ||
1038 | /** | |
1039 | * smk_read_ambient - read() for /smack/ambient | |
1040 | * @filp: file pointer, not actually used | |
1041 | * @buf: where to put the result | |
1042 | * @cn: maximum to send along | |
1043 | * @ppos: where to start | |
1044 | * | |
1045 | * Returns number of bytes read or error code, as appropriate | |
1046 | */ | |
1047 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1048 | size_t cn, loff_t *ppos) | |
1049 | { | |
1050 | ssize_t rc; | |
e114e473 CS |
1051 | int asize; |
1052 | ||
1053 | if (*ppos != 0) | |
1054 | return 0; | |
1055 | /* | |
1056 | * Being careful to avoid a problem in the case where | |
1057 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1058 | */ |
4bc87e62 | 1059 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1060 | |
4bc87e62 CS |
1061 | asize = strlen(smack_net_ambient) + 1; |
1062 | ||
1063 | if (cn >= asize) | |
1064 | rc = simple_read_from_buffer(buf, cn, ppos, | |
1065 | smack_net_ambient, asize); | |
1066 | else | |
1067 | rc = -EINVAL; | |
e114e473 | 1068 | |
4bc87e62 | 1069 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1070 | |
1071 | return rc; | |
1072 | } | |
1073 | ||
1074 | /** | |
1075 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1076 | * @file: file pointer, not actually used |
e114e473 CS |
1077 | * @buf: where to get the data from |
1078 | * @count: bytes sent | |
1079 | * @ppos: where to start | |
1080 | * | |
1081 | * Returns number of bytes written or error code, as appropriate | |
1082 | */ | |
1083 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1084 | size_t count, loff_t *ppos) | |
1085 | { | |
1086 | char in[SMK_LABELLEN]; | |
4bc87e62 | 1087 | char *oldambient; |
e114e473 CS |
1088 | char *smack; |
1089 | ||
1090 | if (!capable(CAP_MAC_ADMIN)) | |
1091 | return -EPERM; | |
1092 | ||
1093 | if (count >= SMK_LABELLEN) | |
1094 | return -EINVAL; | |
1095 | ||
1096 | if (copy_from_user(in, buf, count) != 0) | |
1097 | return -EFAULT; | |
1098 | ||
1099 | smack = smk_import(in, count); | |
1100 | if (smack == NULL) | |
1101 | return -EINVAL; | |
1102 | ||
4bc87e62 CS |
1103 | mutex_lock(&smack_ambient_lock); |
1104 | ||
1105 | oldambient = smack_net_ambient; | |
e114e473 | 1106 | smack_net_ambient = smack; |
4bc87e62 CS |
1107 | smk_unlbl_ambient(oldambient); |
1108 | ||
1109 | mutex_unlock(&smack_ambient_lock); | |
e114e473 CS |
1110 | |
1111 | return count; | |
1112 | } | |
1113 | ||
1114 | static const struct file_operations smk_ambient_ops = { | |
1115 | .read = smk_read_ambient, | |
1116 | .write = smk_write_ambient, | |
6038f373 | 1117 | .llseek = default_llseek, |
e114e473 CS |
1118 | }; |
1119 | ||
15446235 CS |
1120 | /** |
1121 | * smk_read_onlycap - read() for /smack/onlycap | |
1122 | * @filp: file pointer, not actually used | |
1123 | * @buf: where to put the result | |
1124 | * @cn: maximum to send along | |
1125 | * @ppos: where to start | |
1126 | * | |
1127 | * Returns number of bytes read or error code, as appropriate | |
1128 | */ | |
1129 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, | |
1130 | size_t cn, loff_t *ppos) | |
1131 | { | |
1132 | char *smack = ""; | |
1133 | ssize_t rc = -EINVAL; | |
1134 | int asize; | |
1135 | ||
1136 | if (*ppos != 0) | |
1137 | return 0; | |
1138 | ||
1139 | if (smack_onlycap != NULL) | |
1140 | smack = smack_onlycap; | |
1141 | ||
1142 | asize = strlen(smack) + 1; | |
1143 | ||
1144 | if (cn >= asize) | |
1145 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
1146 | ||
1147 | return rc; | |
1148 | } | |
1149 | ||
1150 | /** | |
1151 | * smk_write_onlycap - write() for /smack/onlycap | |
251a2a95 | 1152 | * @file: file pointer, not actually used |
15446235 CS |
1153 | * @buf: where to get the data from |
1154 | * @count: bytes sent | |
1155 | * @ppos: where to start | |
1156 | * | |
1157 | * Returns number of bytes written or error code, as appropriate | |
1158 | */ | |
1159 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
1160 | size_t count, loff_t *ppos) | |
1161 | { | |
1162 | char in[SMK_LABELLEN]; | |
b6dff3ec | 1163 | char *sp = current->cred->security; |
15446235 CS |
1164 | |
1165 | if (!capable(CAP_MAC_ADMIN)) | |
1166 | return -EPERM; | |
1167 | ||
1168 | /* | |
1169 | * This can be done using smk_access() but is done | |
1170 | * explicitly for clarity. The smk_access() implementation | |
1171 | * would use smk_access(smack_onlycap, MAY_WRITE) | |
1172 | */ | |
1173 | if (smack_onlycap != NULL && smack_onlycap != sp) | |
1174 | return -EPERM; | |
1175 | ||
1176 | if (count >= SMK_LABELLEN) | |
1177 | return -EINVAL; | |
1178 | ||
1179 | if (copy_from_user(in, buf, count) != 0) | |
1180 | return -EFAULT; | |
1181 | ||
1182 | /* | |
1183 | * Should the null string be passed in unset the onlycap value. | |
1184 | * This seems like something to be careful with as usually | |
1185 | * smk_import only expects to return NULL for errors. It | |
1186 | * is usually the case that a nullstring or "\n" would be | |
1187 | * bad to pass to smk_import but in fact this is useful here. | |
1188 | */ | |
1189 | smack_onlycap = smk_import(in, count); | |
1190 | ||
1191 | return count; | |
1192 | } | |
1193 | ||
1194 | static const struct file_operations smk_onlycap_ops = { | |
1195 | .read = smk_read_onlycap, | |
1196 | .write = smk_write_onlycap, | |
6038f373 | 1197 | .llseek = default_llseek, |
15446235 CS |
1198 | }; |
1199 | ||
ecfcc53f EB |
1200 | /** |
1201 | * smk_read_logging - read() for /smack/logging | |
1202 | * @filp: file pointer, not actually used | |
1203 | * @buf: where to put the result | |
1204 | * @cn: maximum to send along | |
1205 | * @ppos: where to start | |
1206 | * | |
1207 | * Returns number of bytes read or error code, as appropriate | |
1208 | */ | |
1209 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
1210 | size_t count, loff_t *ppos) | |
1211 | { | |
1212 | char temp[32]; | |
1213 | ssize_t rc; | |
1214 | ||
1215 | if (*ppos != 0) | |
1216 | return 0; | |
1217 | ||
1218 | sprintf(temp, "%d\n", log_policy); | |
1219 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1220 | return rc; | |
1221 | } | |
1222 | ||
1223 | /** | |
1224 | * smk_write_logging - write() for /smack/logging | |
1225 | * @file: file pointer, not actually used | |
1226 | * @buf: where to get the data from | |
1227 | * @count: bytes sent | |
1228 | * @ppos: where to start | |
1229 | * | |
1230 | * Returns number of bytes written or error code, as appropriate | |
1231 | */ | |
1232 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
1233 | size_t count, loff_t *ppos) | |
1234 | { | |
1235 | char temp[32]; | |
1236 | int i; | |
1237 | ||
1238 | if (!capable(CAP_MAC_ADMIN)) | |
1239 | return -EPERM; | |
1240 | ||
1241 | if (count >= sizeof(temp) || count == 0) | |
1242 | return -EINVAL; | |
1243 | ||
1244 | if (copy_from_user(temp, buf, count) != 0) | |
1245 | return -EFAULT; | |
1246 | ||
1247 | temp[count] = '\0'; | |
1248 | ||
1249 | if (sscanf(temp, "%d", &i) != 1) | |
1250 | return -EINVAL; | |
1251 | if (i < 0 || i > 3) | |
1252 | return -EINVAL; | |
1253 | log_policy = i; | |
1254 | return count; | |
1255 | } | |
1256 | ||
1257 | ||
1258 | ||
1259 | static const struct file_operations smk_logging_ops = { | |
1260 | .read = smk_read_logging, | |
1261 | .write = smk_write_logging, | |
6038f373 | 1262 | .llseek = default_llseek, |
ecfcc53f | 1263 | }; |
e114e473 CS |
1264 | /** |
1265 | * smk_fill_super - fill the /smackfs superblock | |
1266 | * @sb: the empty superblock | |
1267 | * @data: unused | |
1268 | * @silent: unused | |
1269 | * | |
1270 | * Fill in the well known entries for /smack | |
1271 | * | |
1272 | * Returns 0 on success, an error code on failure | |
1273 | */ | |
1274 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
1275 | { | |
1276 | int rc; | |
1277 | struct inode *root_inode; | |
1278 | ||
1279 | static struct tree_descr smack_files[] = { | |
1280 | [SMK_LOAD] = | |
1281 | {"load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
1282 | [SMK_CIPSO] = | |
1283 | {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
1284 | [SMK_DOI] = | |
1285 | {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
1286 | [SMK_DIRECT] = | |
1287 | {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
1288 | [SMK_AMBIENT] = | |
1289 | {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
6d3dc07c CS |
1290 | [SMK_NETLBLADDR] = |
1291 | {"netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, | |
15446235 CS |
1292 | [SMK_ONLYCAP] = |
1293 | {"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
ecfcc53f EB |
1294 | [SMK_LOGGING] = |
1295 | {"logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
e114e473 CS |
1296 | /* last one */ {""} |
1297 | }; | |
1298 | ||
1299 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
1300 | if (rc != 0) { | |
1301 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
1302 | __func__, rc); | |
1303 | return rc; | |
1304 | } | |
1305 | ||
1306 | root_inode = sb->s_root->d_inode; | |
1307 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); | |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | /** | |
fc14f2fe | 1313 | * smk_mount - get the smackfs superblock |
e114e473 CS |
1314 | * @fs_type: passed along without comment |
1315 | * @flags: passed along without comment | |
1316 | * @dev_name: passed along without comment | |
1317 | * @data: passed along without comment | |
e114e473 CS |
1318 | * |
1319 | * Just passes everything along. | |
1320 | * | |
1321 | * Returns what the lower level code does. | |
1322 | */ | |
fc14f2fe AV |
1323 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
1324 | int flags, const char *dev_name, void *data) | |
e114e473 | 1325 | { |
fc14f2fe | 1326 | return mount_single(fs_type, flags, data, smk_fill_super); |
e114e473 CS |
1327 | } |
1328 | ||
1329 | static struct file_system_type smk_fs_type = { | |
1330 | .name = "smackfs", | |
fc14f2fe | 1331 | .mount = smk_mount, |
e114e473 CS |
1332 | .kill_sb = kill_litter_super, |
1333 | }; | |
1334 | ||
1335 | static struct vfsmount *smackfs_mount; | |
1336 | ||
1337 | /** | |
1338 | * init_smk_fs - get the smackfs superblock | |
1339 | * | |
1340 | * register the smackfs | |
1341 | * | |
076c54c5 AD |
1342 | * Do not register smackfs if Smack wasn't enabled |
1343 | * on boot. We can not put this method normally under the | |
1344 | * smack_init() code path since the security subsystem get | |
1345 | * initialized before the vfs caches. | |
1346 | * | |
1347 | * Returns true if we were not chosen on boot or if | |
1348 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
1349 | */ |
1350 | static int __init init_smk_fs(void) | |
1351 | { | |
1352 | int err; | |
1353 | ||
076c54c5 AD |
1354 | if (!security_module_enable(&smack_ops)) |
1355 | return 0; | |
1356 | ||
e114e473 CS |
1357 | err = register_filesystem(&smk_fs_type); |
1358 | if (!err) { | |
1359 | smackfs_mount = kern_mount(&smk_fs_type); | |
1360 | if (IS_ERR(smackfs_mount)) { | |
1361 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
1362 | err = PTR_ERR(smackfs_mount); | |
1363 | smackfs_mount = NULL; | |
1364 | } | |
1365 | } | |
1366 | ||
e114e473 | 1367 | smk_cipso_doi(); |
4bc87e62 | 1368 | smk_unlbl_ambient(NULL); |
e114e473 CS |
1369 | |
1370 | return err; | |
1371 | } | |
1372 | ||
1373 | __initcall(init_smk_fs); |