]>
Commit | Line | Data |
---|---|---|
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> | |
6d3dc07c | 23 | #include <net/net_namespace.h> |
e114e473 CS |
24 | #include <net/netlabel.h> |
25 | #include <net/cipso_ipv4.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/ctype.h> | |
4bc87e62 | 28 | #include <linux/audit.h> |
e114e473 CS |
29 | #include "smack.h" |
30 | ||
31 | /* | |
32 | * smackfs pseudo filesystem. | |
33 | */ | |
34 | ||
35 | enum smk_inos { | |
36 | SMK_ROOT_INO = 2, | |
37 | SMK_LOAD = 3, /* load policy */ | |
38 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ | |
39 | SMK_DOI = 5, /* CIPSO DOI */ | |
40 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ | |
41 | SMK_AMBIENT = 7, /* internet ambient label */ | |
6d3dc07c | 42 | SMK_NETLBLADDR = 8, /* single label hosts */ |
15446235 | 43 | SMK_ONLYCAP = 9, /* the only "capable" label */ |
e114e473 CS |
44 | }; |
45 | ||
46 | /* | |
47 | * List locks | |
48 | */ | |
49 | static DEFINE_MUTEX(smack_list_lock); | |
50 | static DEFINE_MUTEX(smack_cipso_lock); | |
4bc87e62 | 51 | static DEFINE_MUTEX(smack_ambient_lock); |
6d3dc07c | 52 | static DEFINE_MUTEX(smk_netlbladdr_lock); |
e114e473 CS |
53 | |
54 | /* | |
55 | * This is the "ambient" label for network traffic. | |
56 | * If it isn't somehow marked, use this. | |
57 | * It can be reset via smackfs/ambient | |
58 | */ | |
59 | char *smack_net_ambient = smack_known_floor.smk_known; | |
60 | ||
e114e473 CS |
61 | /* |
62 | * This is the level in a CIPSO header that indicates a | |
63 | * smack label is contained directly in the category set. | |
64 | * It can be reset via smackfs/direct | |
65 | */ | |
66 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
67 | ||
15446235 CS |
68 | /* |
69 | * Unless a process is running with this label even | |
70 | * having CAP_MAC_OVERRIDE isn't enough to grant | |
71 | * privilege to violate MAC policy. If no label is | |
72 | * designated (the NULL case) capabilities apply to | |
73 | * everyone. It is expected that the hat (^) label | |
74 | * will be used if any label is used. | |
75 | */ | |
76 | char *smack_onlycap; | |
77 | ||
6d3dc07c CS |
78 | /* |
79 | * Certain IP addresses may be designated as single label hosts. | |
80 | * Packets are sent there unlabeled, but only from tasks that | |
81 | * can write to the specified label. | |
82 | */ | |
7198e2ee EB |
83 | |
84 | LIST_HEAD(smk_netlbladdr_list); | |
85 | LIST_HEAD(smack_rule_list); | |
6d3dc07c | 86 | |
e114e473 | 87 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 88 | |
4303154e EB |
89 | const char *smack_cipso_option = SMACK_CIPSO_OPTION; |
90 | ||
91 | ||
e114e473 CS |
92 | #define SEQ_READ_FINISHED 1 |
93 | ||
e114e473 CS |
94 | /* |
95 | * Values for parsing cipso rules | |
96 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
97 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
98 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
99 | */ |
100 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
101 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
102 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
103 | ||
104 | /* | |
105 | * Values for parsing MAC rules | |
106 | * SMK_ACCESS: Maximum possible combination of access permissions | |
107 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
108 | * SMK_LOADLEN: Smack rule length | |
109 | */ | |
110 | #define SMK_ACCESS "rwxa" | |
111 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
112 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
113 | ||
6d3dc07c CS |
114 | /** |
115 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
116 | * @nap: structure to fill | |
117 | */ | |
118 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
119 | { | |
120 | nap->loginuid = audit_get_loginuid(current); | |
121 | nap->sessionid = audit_get_sessionid(current); | |
122 | nap->secid = smack_to_secid(current_security()); | |
123 | } | |
124 | ||
125 | /* | |
126 | * Values for parsing single label host rules | |
127 | * "1.2.3.4 X" | |
128 | * "192.168.138.129/32 abcdefghijklmnopqrstuvw" | |
129 | */ | |
130 | #define SMK_NETLBLADDRMIN 9 | |
131 | #define SMK_NETLBLADDRMAX 42 | |
e114e473 CS |
132 | |
133 | /* | |
134 | * Seq_file read operations for /smack/load | |
135 | */ | |
136 | ||
137 | static void *load_seq_start(struct seq_file *s, loff_t *pos) | |
138 | { | |
139 | if (*pos == SEQ_READ_FINISHED) | |
140 | return NULL; | |
7198e2ee EB |
141 | if (list_empty(&smack_rule_list)) |
142 | return NULL; | |
143 | return smack_rule_list.next; | |
e114e473 CS |
144 | } |
145 | ||
146 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
147 | { | |
7198e2ee | 148 | struct list_head *list = v; |
e114e473 | 149 | |
7198e2ee | 150 | if (list_is_last(list, &smack_rule_list)) { |
e114e473 | 151 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
152 | return NULL; |
153 | } | |
154 | return list->next; | |
e114e473 CS |
155 | } |
156 | ||
157 | static int load_seq_show(struct seq_file *s, void *v) | |
158 | { | |
7198e2ee EB |
159 | struct list_head *list = v; |
160 | struct smack_rule *srp = | |
161 | list_entry(list, struct smack_rule, list); | |
e114e473 CS |
162 | |
163 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
164 | (char *)srp->smk_object); | |
165 | ||
166 | seq_putc(s, ' '); | |
167 | ||
168 | if (srp->smk_access & MAY_READ) | |
169 | seq_putc(s, 'r'); | |
170 | if (srp->smk_access & MAY_WRITE) | |
171 | seq_putc(s, 'w'); | |
172 | if (srp->smk_access & MAY_EXEC) | |
173 | seq_putc(s, 'x'); | |
174 | if (srp->smk_access & MAY_APPEND) | |
175 | seq_putc(s, 'a'); | |
176 | if (srp->smk_access == 0) | |
177 | seq_putc(s, '-'); | |
178 | ||
179 | seq_putc(s, '\n'); | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | static void load_seq_stop(struct seq_file *s, void *v) | |
185 | { | |
186 | /* No-op */ | |
187 | } | |
188 | ||
189 | static struct seq_operations load_seq_ops = { | |
190 | .start = load_seq_start, | |
191 | .next = load_seq_next, | |
192 | .show = load_seq_show, | |
193 | .stop = load_seq_stop, | |
194 | }; | |
195 | ||
196 | /** | |
197 | * smk_open_load - open() for /smack/load | |
198 | * @inode: inode structure representing file | |
199 | * @file: "load" file pointer | |
200 | * | |
201 | * For reading, use load_seq_* seq_file reading operations. | |
202 | */ | |
203 | static int smk_open_load(struct inode *inode, struct file *file) | |
204 | { | |
cb622bbb | 205 | return seq_open(file, &load_seq_ops); |
e114e473 CS |
206 | } |
207 | ||
208 | /** | |
209 | * smk_set_access - add a rule to the rule list | |
210 | * @srp: the new rule to add | |
211 | * | |
212 | * Looks through the current subject/object/access list for | |
213 | * the subject/object pair and replaces the access that was | |
214 | * there. If the pair isn't found add it with the specified | |
215 | * access. | |
81ea714b SL |
216 | * |
217 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails | |
218 | * during the allocation of the new pair to add. | |
e114e473 | 219 | */ |
81ea714b | 220 | static int smk_set_access(struct smack_rule *srp) |
e114e473 | 221 | { |
7198e2ee | 222 | struct smack_rule *sp; |
81ea714b | 223 | int ret = 0; |
7198e2ee | 224 | int found; |
e114e473 CS |
225 | mutex_lock(&smack_list_lock); |
226 | ||
7198e2ee EB |
227 | found = 0; |
228 | list_for_each_entry_rcu(sp, &smack_rule_list, list) { | |
229 | if (sp->smk_subject == srp->smk_subject && | |
230 | sp->smk_object == srp->smk_object) { | |
231 | found = 1; | |
232 | sp->smk_access = srp->smk_access; | |
e114e473 CS |
233 | break; |
234 | } | |
e114e473 | 235 | } |
7198e2ee EB |
236 | if (found == 0) |
237 | list_add_rcu(&srp->list, &smack_rule_list); | |
e114e473 CS |
238 | |
239 | mutex_unlock(&smack_list_lock); | |
240 | ||
81ea714b | 241 | return ret; |
e114e473 CS |
242 | } |
243 | ||
244 | /** | |
245 | * smk_write_load - write() for /smack/load | |
251a2a95 | 246 | * @file: file pointer, not actually used |
e114e473 CS |
247 | * @buf: where to get the data from |
248 | * @count: bytes sent | |
249 | * @ppos: where to start - must be 0 | |
250 | * | |
251 | * Get one smack access rule from above. | |
252 | * The format is exactly: | |
253 | * char subject[SMK_LABELLEN] | |
254 | * char object[SMK_LABELLEN] | |
b500ce8d | 255 | * char access[SMK_ACCESSLEN] |
e114e473 | 256 | * |
b500ce8d | 257 | * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. |
e114e473 | 258 | */ |
e114e473 CS |
259 | static ssize_t smk_write_load(struct file *file, const char __user *buf, |
260 | size_t count, loff_t *ppos) | |
261 | { | |
7198e2ee | 262 | struct smack_rule *rule; |
e114e473 CS |
263 | char *data; |
264 | int rc = -EINVAL; | |
265 | ||
266 | /* | |
267 | * Must have privilege. | |
268 | * No partial writes. | |
269 | * Enough data must be present. | |
270 | */ | |
271 | if (!capable(CAP_MAC_ADMIN)) | |
272 | return -EPERM; | |
7198e2ee EB |
273 | |
274 | if (*ppos != 0 || count != SMK_LOADLEN) | |
e114e473 CS |
275 | return -EINVAL; |
276 | ||
277 | data = kzalloc(count, GFP_KERNEL); | |
278 | if (data == NULL) | |
279 | return -ENOMEM; | |
280 | ||
281 | if (copy_from_user(data, buf, count) != 0) { | |
282 | rc = -EFAULT; | |
283 | goto out; | |
284 | } | |
285 | ||
7198e2ee EB |
286 | rule = kzalloc(sizeof(*rule), GFP_KERNEL); |
287 | if (rule == NULL) { | |
288 | rc = -ENOMEM; | |
e114e473 | 289 | goto out; |
7198e2ee | 290 | } |
e114e473 | 291 | |
7198e2ee EB |
292 | rule->smk_subject = smk_import(data, 0); |
293 | if (rule->smk_subject == NULL) | |
294 | goto out_free_rule; | |
e114e473 | 295 | |
7198e2ee EB |
296 | rule->smk_object = smk_import(data + SMK_LABELLEN, 0); |
297 | if (rule->smk_object == NULL) | |
298 | goto out_free_rule; | |
299 | ||
300 | rule->smk_access = 0; | |
e114e473 CS |
301 | |
302 | switch (data[SMK_LABELLEN + SMK_LABELLEN]) { | |
303 | case '-': | |
304 | break; | |
305 | case 'r': | |
306 | case 'R': | |
7198e2ee | 307 | rule->smk_access |= MAY_READ; |
e114e473 CS |
308 | break; |
309 | default: | |
7198e2ee | 310 | goto out_free_rule; |
e114e473 CS |
311 | } |
312 | ||
313 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { | |
314 | case '-': | |
315 | break; | |
316 | case 'w': | |
317 | case 'W': | |
7198e2ee | 318 | rule->smk_access |= MAY_WRITE; |
e114e473 CS |
319 | break; |
320 | default: | |
7198e2ee | 321 | goto out_free_rule; |
e114e473 CS |
322 | } |
323 | ||
324 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { | |
325 | case '-': | |
326 | break; | |
327 | case 'x': | |
328 | case 'X': | |
7198e2ee | 329 | rule->smk_access |= MAY_EXEC; |
e114e473 CS |
330 | break; |
331 | default: | |
7198e2ee | 332 | goto out_free_rule; |
e114e473 CS |
333 | } |
334 | ||
335 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { | |
336 | case '-': | |
337 | break; | |
338 | case 'a': | |
339 | case 'A': | |
7198e2ee | 340 | rule->smk_access |= MAY_APPEND; |
e114e473 CS |
341 | break; |
342 | default: | |
7198e2ee | 343 | goto out_free_rule; |
e114e473 CS |
344 | } |
345 | ||
7198e2ee | 346 | rc = smk_set_access(rule); |
81ea714b SL |
347 | |
348 | if (!rc) | |
349 | rc = count; | |
7198e2ee | 350 | goto out; |
e114e473 | 351 | |
7198e2ee EB |
352 | out_free_rule: |
353 | kfree(rule); | |
e114e473 CS |
354 | out: |
355 | kfree(data); | |
356 | return rc; | |
357 | } | |
358 | ||
359 | static const struct file_operations smk_load_ops = { | |
360 | .open = smk_open_load, | |
361 | .read = seq_read, | |
362 | .llseek = seq_lseek, | |
363 | .write = smk_write_load, | |
cb622bbb | 364 | .release = seq_release, |
e114e473 CS |
365 | }; |
366 | ||
367 | /** | |
368 | * smk_cipso_doi - initialize the CIPSO domain | |
369 | */ | |
30aa4faf | 370 | static void smk_cipso_doi(void) |
e114e473 CS |
371 | { |
372 | int rc; | |
373 | struct cipso_v4_doi *doip; | |
6d3dc07c | 374 | struct netlbl_audit nai; |
e114e473 | 375 | |
6d3dc07c | 376 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 377 | |
6d3dc07c | 378 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
379 | if (rc != 0) |
380 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
381 | __func__, __LINE__, rc); | |
382 | ||
383 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
384 | if (doip == NULL) | |
385 | panic("smack: Failed to initialize cipso DOI.\n"); | |
386 | doip->map.std = NULL; | |
387 | doip->doi = smk_cipso_doi_value; | |
388 | doip->type = CIPSO_V4_MAP_PASS; | |
389 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
390 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
391 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
392 | ||
6d3dc07c | 393 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 394 | if (rc != 0) { |
6c2e8ac0 PM |
395 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
396 | __func__, __LINE__, rc); | |
397 | kfree(doip); | |
398 | return; | |
399 | } | |
6d3dc07c | 400 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
401 | if (rc != 0) { |
402 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 403 | __func__, __LINE__, rc); |
b1edeb10 | 404 | kfree(doip); |
6c2e8ac0 | 405 | return; |
b1edeb10 | 406 | } |
e114e473 CS |
407 | } |
408 | ||
4bc87e62 CS |
409 | /** |
410 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 411 | * @oldambient: previous domain string |
4bc87e62 | 412 | */ |
30aa4faf | 413 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
414 | { |
415 | int rc; | |
6d3dc07c | 416 | struct netlbl_audit nai; |
4bc87e62 | 417 | |
6d3dc07c | 418 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
419 | |
420 | if (oldambient != NULL) { | |
6d3dc07c | 421 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
422 | if (rc != 0) |
423 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
424 | __func__, __LINE__, rc); | |
425 | } | |
426 | ||
6d3dc07c CS |
427 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET, |
428 | NULL, NULL, &nai); | |
4bc87e62 CS |
429 | if (rc != 0) |
430 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
431 | __func__, __LINE__, rc); | |
432 | } | |
433 | ||
e114e473 CS |
434 | /* |
435 | * Seq_file read operations for /smack/cipso | |
436 | */ | |
437 | ||
438 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
439 | { | |
440 | if (*pos == SEQ_READ_FINISHED) | |
441 | return NULL; | |
7198e2ee EB |
442 | if (list_empty(&smack_known_list)) |
443 | return NULL; | |
e114e473 | 444 | |
7198e2ee | 445 | return smack_known_list.next; |
e114e473 CS |
446 | } |
447 | ||
448 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
449 | { | |
7198e2ee | 450 | struct list_head *list = v; |
e114e473 CS |
451 | |
452 | /* | |
7198e2ee EB |
453 | * labels with no associated cipso value wont be printed |
454 | * in cipso_seq_show | |
e114e473 | 455 | */ |
7198e2ee | 456 | if (list_is_last(list, &smack_known_list)) { |
e114e473 | 457 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
458 | return NULL; |
459 | } | |
e114e473 | 460 | |
7198e2ee | 461 | return list->next; |
e114e473 CS |
462 | } |
463 | ||
464 | /* | |
465 | * Print cipso labels in format: | |
466 | * label level[/cat[,cat]] | |
467 | */ | |
468 | static int cipso_seq_show(struct seq_file *s, void *v) | |
469 | { | |
7198e2ee EB |
470 | struct list_head *list = v; |
471 | struct smack_known *skp = | |
472 | list_entry(list, struct smack_known, list); | |
e114e473 CS |
473 | struct smack_cipso *scp = skp->smk_cipso; |
474 | char *cbp; | |
475 | char sep = '/'; | |
476 | int cat = 1; | |
477 | int i; | |
478 | unsigned char m; | |
479 | ||
480 | if (scp == NULL) | |
481 | return 0; | |
482 | ||
483 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); | |
484 | ||
485 | cbp = scp->smk_catset; | |
486 | for (i = 0; i < SMK_LABELLEN; i++) | |
487 | for (m = 0x80; m != 0; m >>= 1) { | |
488 | if (m & cbp[i]) { | |
489 | seq_printf(s, "%c%d", sep, cat); | |
490 | sep = ','; | |
491 | } | |
492 | cat++; | |
493 | } | |
494 | ||
495 | seq_putc(s, '\n'); | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static void cipso_seq_stop(struct seq_file *s, void *v) | |
501 | { | |
502 | /* No-op */ | |
503 | } | |
504 | ||
505 | static struct seq_operations cipso_seq_ops = { | |
506 | .start = cipso_seq_start, | |
507 | .stop = cipso_seq_stop, | |
508 | .next = cipso_seq_next, | |
509 | .show = cipso_seq_show, | |
510 | }; | |
511 | ||
512 | /** | |
513 | * smk_open_cipso - open() for /smack/cipso | |
514 | * @inode: inode structure representing file | |
515 | * @file: "cipso" file pointer | |
516 | * | |
517 | * Connect our cipso_seq_* operations with /smack/cipso | |
518 | * file_operations | |
519 | */ | |
520 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
521 | { | |
522 | return seq_open(file, &cipso_seq_ops); | |
523 | } | |
524 | ||
525 | /** | |
526 | * smk_write_cipso - write() for /smack/cipso | |
251a2a95 | 527 | * @file: file pointer, not actually used |
e114e473 CS |
528 | * @buf: where to get the data from |
529 | * @count: bytes sent | |
530 | * @ppos: where to start | |
531 | * | |
532 | * Accepts only one cipso rule per write call. | |
533 | * Returns number of bytes written or error code, as appropriate | |
534 | */ | |
535 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
536 | size_t count, loff_t *ppos) | |
537 | { | |
538 | struct smack_known *skp; | |
539 | struct smack_cipso *scp = NULL; | |
540 | char mapcatset[SMK_LABELLEN]; | |
541 | int maplevel; | |
542 | int cat; | |
543 | int catlen; | |
544 | ssize_t rc = -EINVAL; | |
545 | char *data = NULL; | |
546 | char *rule; | |
547 | int ret; | |
548 | int i; | |
549 | ||
550 | /* | |
551 | * Must have privilege. | |
552 | * No partial writes. | |
553 | * Enough data must be present. | |
554 | */ | |
555 | if (!capable(CAP_MAC_ADMIN)) | |
556 | return -EPERM; | |
557 | if (*ppos != 0) | |
558 | return -EINVAL; | |
b500ce8d | 559 | if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) |
e114e473 CS |
560 | return -EINVAL; |
561 | ||
562 | data = kzalloc(count + 1, GFP_KERNEL); | |
563 | if (data == NULL) | |
564 | return -ENOMEM; | |
565 | ||
566 | if (copy_from_user(data, buf, count) != 0) { | |
567 | rc = -EFAULT; | |
568 | goto unlockedout; | |
569 | } | |
570 | ||
4303154e EB |
571 | /* labels cannot begin with a '-' */ |
572 | if (data[0] == '-') { | |
573 | rc = -EINVAL; | |
574 | goto unlockedout; | |
575 | } | |
e114e473 CS |
576 | data[count] = '\0'; |
577 | rule = data; | |
578 | /* | |
579 | * Only allow one writer at a time. Writes should be | |
580 | * quite rare and small in any case. | |
581 | */ | |
582 | mutex_lock(&smack_cipso_lock); | |
583 | ||
584 | skp = smk_import_entry(rule, 0); | |
585 | if (skp == NULL) | |
586 | goto out; | |
587 | ||
c19a28e1 | 588 | rule += SMK_LABELLEN; |
e114e473 CS |
589 | ret = sscanf(rule, "%d", &maplevel); |
590 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
591 | goto out; | |
592 | ||
593 | rule += SMK_DIGITLEN; | |
594 | ret = sscanf(rule, "%d", &catlen); | |
595 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
596 | goto out; | |
597 | ||
b500ce8d | 598 | if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
e114e473 CS |
599 | goto out; |
600 | ||
601 | memset(mapcatset, 0, sizeof(mapcatset)); | |
602 | ||
603 | for (i = 0; i < catlen; i++) { | |
604 | rule += SMK_DIGITLEN; | |
605 | ret = sscanf(rule, "%d", &cat); | |
606 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) | |
607 | goto out; | |
608 | ||
609 | smack_catset_bit(cat, mapcatset); | |
610 | } | |
611 | ||
612 | if (skp->smk_cipso == NULL) { | |
613 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); | |
614 | if (scp == NULL) { | |
615 | rc = -ENOMEM; | |
616 | goto out; | |
617 | } | |
618 | } | |
619 | ||
620 | spin_lock_bh(&skp->smk_cipsolock); | |
621 | ||
622 | if (scp == NULL) | |
623 | scp = skp->smk_cipso; | |
624 | else | |
625 | skp->smk_cipso = scp; | |
626 | ||
627 | scp->smk_level = maplevel; | |
628 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); | |
629 | ||
630 | spin_unlock_bh(&skp->smk_cipsolock); | |
631 | ||
632 | rc = count; | |
633 | out: | |
634 | mutex_unlock(&smack_cipso_lock); | |
635 | unlockedout: | |
636 | kfree(data); | |
637 | return rc; | |
638 | } | |
639 | ||
640 | static const struct file_operations smk_cipso_ops = { | |
641 | .open = smk_open_cipso, | |
642 | .read = seq_read, | |
643 | .llseek = seq_lseek, | |
644 | .write = smk_write_cipso, | |
645 | .release = seq_release, | |
646 | }; | |
647 | ||
6d3dc07c CS |
648 | /* |
649 | * Seq_file read operations for /smack/netlabel | |
650 | */ | |
651 | ||
652 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) | |
653 | { | |
654 | if (*pos == SEQ_READ_FINISHED) | |
655 | return NULL; | |
7198e2ee EB |
656 | if (list_empty(&smk_netlbladdr_list)) |
657 | return NULL; | |
658 | return smk_netlbladdr_list.next; | |
6d3dc07c CS |
659 | } |
660 | ||
661 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
662 | { | |
7198e2ee | 663 | struct list_head *list = v; |
6d3dc07c | 664 | |
7198e2ee | 665 | if (list_is_last(list, &smk_netlbladdr_list)) { |
6d3dc07c | 666 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
667 | return NULL; |
668 | } | |
6d3dc07c | 669 | |
7198e2ee | 670 | return list->next; |
6d3dc07c | 671 | } |
6d3dc07c CS |
672 | #define BEBITS (sizeof(__be32) * 8) |
673 | ||
674 | /* | |
675 | * Print host/label pairs | |
676 | */ | |
677 | static int netlbladdr_seq_show(struct seq_file *s, void *v) | |
678 | { | |
7198e2ee EB |
679 | struct list_head *list = v; |
680 | struct smk_netlbladdr *skp = | |
681 | list_entry(list, struct smk_netlbladdr, list); | |
6d3dc07c | 682 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
113a0e45 | 683 | int maskn; |
684 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); | |
6d3dc07c | 685 | |
113a0e45 | 686 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
6d3dc07c CS |
687 | |
688 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", | |
689 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | static void netlbladdr_seq_stop(struct seq_file *s, void *v) | |
695 | { | |
696 | /* No-op */ | |
697 | } | |
698 | ||
699 | static struct seq_operations netlbladdr_seq_ops = { | |
700 | .start = netlbladdr_seq_start, | |
701 | .stop = netlbladdr_seq_stop, | |
702 | .next = netlbladdr_seq_next, | |
703 | .show = netlbladdr_seq_show, | |
704 | }; | |
705 | ||
706 | /** | |
707 | * smk_open_netlbladdr - open() for /smack/netlabel | |
708 | * @inode: inode structure representing file | |
709 | * @file: "netlabel" file pointer | |
710 | * | |
711 | * Connect our netlbladdr_seq_* operations with /smack/netlabel | |
712 | * file_operations | |
713 | */ | |
714 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) | |
715 | { | |
716 | return seq_open(file, &netlbladdr_seq_ops); | |
717 | } | |
718 | ||
113a0e45 | 719 | /** |
720 | * smk_netlbladdr_insert | |
721 | * @new : netlabel to insert | |
722 | * | |
723 | * This helper insert netlabel in the smack_netlbladdrs list | |
724 | * sorted by netmask length (longest to smallest) | |
7198e2ee EB |
725 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
726 | * | |
113a0e45 | 727 | */ |
728 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) | |
729 | { | |
7198e2ee | 730 | struct smk_netlbladdr *m, *m_next; |
113a0e45 | 731 | |
7198e2ee EB |
732 | if (list_empty(&smk_netlbladdr_list)) { |
733 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 734 | return; |
735 | } | |
736 | ||
7198e2ee EB |
737 | m = list_entry(rcu_dereference(smk_netlbladdr_list.next), |
738 | struct smk_netlbladdr, list); | |
739 | ||
113a0e45 | 740 | /* the comparison '>' is a bit hacky, but works */ |
7198e2ee EB |
741 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
742 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 743 | return; |
744 | } | |
7198e2ee EB |
745 | |
746 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { | |
747 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { | |
748 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 749 | return; |
750 | } | |
7198e2ee EB |
751 | m_next = list_entry(rcu_dereference(m->list.next), |
752 | struct smk_netlbladdr, list); | |
753 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { | |
754 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 755 | return; |
756 | } | |
757 | } | |
758 | } | |
759 | ||
760 | ||
6d3dc07c CS |
761 | /** |
762 | * smk_write_netlbladdr - write() for /smack/netlabel | |
251a2a95 | 763 | * @file: file pointer, not actually used |
6d3dc07c CS |
764 | * @buf: where to get the data from |
765 | * @count: bytes sent | |
766 | * @ppos: where to start | |
767 | * | |
768 | * Accepts only one netlbladdr per write call. | |
769 | * Returns number of bytes written or error code, as appropriate | |
770 | */ | |
771 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, | |
772 | size_t count, loff_t *ppos) | |
773 | { | |
774 | struct smk_netlbladdr *skp; | |
775 | struct sockaddr_in newname; | |
776 | char smack[SMK_LABELLEN]; | |
777 | char *sp; | |
778 | char data[SMK_NETLBLADDRMAX]; | |
779 | char *host = (char *)&newname.sin_addr.s_addr; | |
780 | int rc; | |
781 | struct netlbl_audit audit_info; | |
782 | struct in_addr mask; | |
783 | unsigned int m; | |
7198e2ee | 784 | int found; |
113a0e45 | 785 | u32 mask_bits = (1<<31); |
6d3dc07c | 786 | __be32 nsa; |
113a0e45 | 787 | u32 temp_mask; |
6d3dc07c CS |
788 | |
789 | /* | |
790 | * Must have privilege. | |
791 | * No partial writes. | |
792 | * Enough data must be present. | |
793 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
794 | * "<addr, as a.b.c.d><space><label>" | |
795 | */ | |
796 | if (!capable(CAP_MAC_ADMIN)) | |
797 | return -EPERM; | |
798 | if (*ppos != 0) | |
799 | return -EINVAL; | |
800 | if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX) | |
801 | return -EINVAL; | |
802 | if (copy_from_user(data, buf, count) != 0) | |
803 | return -EFAULT; | |
804 | ||
805 | data[count] = '\0'; | |
806 | ||
807 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", | |
808 | &host[0], &host[1], &host[2], &host[3], &m, smack); | |
809 | if (rc != 6) { | |
810 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
811 | &host[0], &host[1], &host[2], &host[3], smack); | |
812 | if (rc != 5) | |
813 | return -EINVAL; | |
814 | m = BEBITS; | |
815 | } | |
816 | if (m > BEBITS) | |
817 | return -EINVAL; | |
818 | ||
4303154e EB |
819 | /* if smack begins with '-', its an option, don't import it */ |
820 | if (smack[0] != '-') { | |
821 | sp = smk_import(smack, 0); | |
822 | if (sp == NULL) | |
823 | return -EINVAL; | |
824 | } else { | |
825 | /* check known options */ | |
826 | if (strcmp(smack, smack_cipso_option) == 0) | |
827 | sp = (char *)smack_cipso_option; | |
828 | else | |
829 | return -EINVAL; | |
830 | } | |
6d3dc07c | 831 | |
113a0e45 | 832 | for (temp_mask = 0; m > 0; m--) { |
833 | temp_mask |= mask_bits; | |
834 | mask_bits >>= 1; | |
6d3dc07c | 835 | } |
113a0e45 | 836 | mask.s_addr = cpu_to_be32(temp_mask); |
837 | ||
838 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
839 | /* |
840 | * Only allow one writer at a time. Writes should be | |
841 | * quite rare and small in any case. | |
842 | */ | |
843 | mutex_lock(&smk_netlbladdr_lock); | |
844 | ||
845 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 846 | /* try to find if the prefix is already in the list */ |
7198e2ee EB |
847 | found = 0; |
848 | list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { | |
6d3dc07c | 849 | if (skp->smk_host.sin_addr.s_addr == nsa && |
7198e2ee EB |
850 | skp->smk_mask.s_addr == mask.s_addr) { |
851 | found = 1; | |
6d3dc07c | 852 | break; |
7198e2ee EB |
853 | } |
854 | } | |
6d3dc07c CS |
855 | smk_netlabel_audit_set(&audit_info); |
856 | ||
7198e2ee | 857 | if (found == 0) { |
6d3dc07c CS |
858 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
859 | if (skp == NULL) | |
860 | rc = -ENOMEM; | |
861 | else { | |
862 | rc = 0; | |
863 | skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; | |
864 | skp->smk_mask.s_addr = mask.s_addr; | |
6d3dc07c | 865 | skp->smk_label = sp; |
113a0e45 | 866 | smk_netlbladdr_insert(skp); |
6d3dc07c CS |
867 | } |
868 | } else { | |
4303154e EB |
869 | /* we delete the unlabeled entry, only if the previous label |
870 | * wasnt the special CIPSO option */ | |
871 | if (skp->smk_label != smack_cipso_option) | |
872 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, | |
873 | &skp->smk_host.sin_addr, &skp->smk_mask, | |
874 | PF_INET, &audit_info); | |
875 | else | |
876 | rc = 0; | |
6d3dc07c CS |
877 | skp->smk_label = sp; |
878 | } | |
879 | ||
880 | /* | |
881 | * Now tell netlabel about the single label nature of | |
882 | * this host so that incoming packets get labeled. | |
4303154e | 883 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 884 | */ |
4303154e | 885 | if (rc == 0 && sp != smack_cipso_option) |
6d3dc07c CS |
886 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
887 | &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, | |
888 | smack_to_secid(skp->smk_label), &audit_info); | |
889 | ||
890 | if (rc == 0) | |
891 | rc = count; | |
892 | ||
893 | mutex_unlock(&smk_netlbladdr_lock); | |
894 | ||
895 | return rc; | |
896 | } | |
897 | ||
898 | static const struct file_operations smk_netlbladdr_ops = { | |
899 | .open = smk_open_netlbladdr, | |
900 | .read = seq_read, | |
901 | .llseek = seq_lseek, | |
902 | .write = smk_write_netlbladdr, | |
903 | .release = seq_release, | |
904 | }; | |
905 | ||
e114e473 CS |
906 | /** |
907 | * smk_read_doi - read() for /smack/doi | |
908 | * @filp: file pointer, not actually used | |
909 | * @buf: where to put the result | |
910 | * @count: maximum to send along | |
911 | * @ppos: where to start | |
912 | * | |
913 | * Returns number of bytes read or error code, as appropriate | |
914 | */ | |
915 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
916 | size_t count, loff_t *ppos) | |
917 | { | |
918 | char temp[80]; | |
919 | ssize_t rc; | |
920 | ||
921 | if (*ppos != 0) | |
922 | return 0; | |
923 | ||
924 | sprintf(temp, "%d", smk_cipso_doi_value); | |
925 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
926 | ||
927 | return rc; | |
928 | } | |
929 | ||
930 | /** | |
931 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 932 | * @file: file pointer, not actually used |
e114e473 CS |
933 | * @buf: where to get the data from |
934 | * @count: bytes sent | |
935 | * @ppos: where to start | |
936 | * | |
937 | * Returns number of bytes written or error code, as appropriate | |
938 | */ | |
939 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
940 | size_t count, loff_t *ppos) | |
941 | { | |
942 | char temp[80]; | |
943 | int i; | |
944 | ||
945 | if (!capable(CAP_MAC_ADMIN)) | |
946 | return -EPERM; | |
947 | ||
948 | if (count >= sizeof(temp) || count == 0) | |
949 | return -EINVAL; | |
950 | ||
951 | if (copy_from_user(temp, buf, count) != 0) | |
952 | return -EFAULT; | |
953 | ||
954 | temp[count] = '\0'; | |
955 | ||
956 | if (sscanf(temp, "%d", &i) != 1) | |
957 | return -EINVAL; | |
958 | ||
959 | smk_cipso_doi_value = i; | |
960 | ||
961 | smk_cipso_doi(); | |
962 | ||
963 | return count; | |
964 | } | |
965 | ||
966 | static const struct file_operations smk_doi_ops = { | |
967 | .read = smk_read_doi, | |
968 | .write = smk_write_doi, | |
969 | }; | |
970 | ||
971 | /** | |
972 | * smk_read_direct - read() for /smack/direct | |
973 | * @filp: file pointer, not actually used | |
974 | * @buf: where to put the result | |
975 | * @count: maximum to send along | |
976 | * @ppos: where to start | |
977 | * | |
978 | * Returns number of bytes read or error code, as appropriate | |
979 | */ | |
980 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
981 | size_t count, loff_t *ppos) | |
982 | { | |
983 | char temp[80]; | |
984 | ssize_t rc; | |
985 | ||
986 | if (*ppos != 0) | |
987 | return 0; | |
988 | ||
989 | sprintf(temp, "%d", smack_cipso_direct); | |
990 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
991 | ||
992 | return rc; | |
993 | } | |
994 | ||
995 | /** | |
996 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 997 | * @file: file pointer, not actually used |
e114e473 CS |
998 | * @buf: where to get the data from |
999 | * @count: bytes sent | |
1000 | * @ppos: where to start | |
1001 | * | |
1002 | * Returns number of bytes written or error code, as appropriate | |
1003 | */ | |
1004 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1005 | size_t count, loff_t *ppos) | |
1006 | { | |
1007 | char temp[80]; | |
1008 | int i; | |
1009 | ||
1010 | if (!capable(CAP_MAC_ADMIN)) | |
1011 | return -EPERM; | |
1012 | ||
1013 | if (count >= sizeof(temp) || count == 0) | |
1014 | return -EINVAL; | |
1015 | ||
1016 | if (copy_from_user(temp, buf, count) != 0) | |
1017 | return -EFAULT; | |
1018 | ||
1019 | temp[count] = '\0'; | |
1020 | ||
1021 | if (sscanf(temp, "%d", &i) != 1) | |
1022 | return -EINVAL; | |
1023 | ||
1024 | smack_cipso_direct = i; | |
1025 | ||
1026 | return count; | |
1027 | } | |
1028 | ||
1029 | static const struct file_operations smk_direct_ops = { | |
1030 | .read = smk_read_direct, | |
1031 | .write = smk_write_direct, | |
1032 | }; | |
1033 | ||
1034 | /** | |
1035 | * smk_read_ambient - read() for /smack/ambient | |
1036 | * @filp: file pointer, not actually used | |
1037 | * @buf: where to put the result | |
1038 | * @cn: maximum to send along | |
1039 | * @ppos: where to start | |
1040 | * | |
1041 | * Returns number of bytes read or error code, as appropriate | |
1042 | */ | |
1043 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1044 | size_t cn, loff_t *ppos) | |
1045 | { | |
1046 | ssize_t rc; | |
e114e473 CS |
1047 | int asize; |
1048 | ||
1049 | if (*ppos != 0) | |
1050 | return 0; | |
1051 | /* | |
1052 | * Being careful to avoid a problem in the case where | |
1053 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1054 | */ |
4bc87e62 | 1055 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1056 | |
4bc87e62 CS |
1057 | asize = strlen(smack_net_ambient) + 1; |
1058 | ||
1059 | if (cn >= asize) | |
1060 | rc = simple_read_from_buffer(buf, cn, ppos, | |
1061 | smack_net_ambient, asize); | |
1062 | else | |
1063 | rc = -EINVAL; | |
e114e473 | 1064 | |
4bc87e62 | 1065 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1066 | |
1067 | return rc; | |
1068 | } | |
1069 | ||
1070 | /** | |
1071 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1072 | * @file: file pointer, not actually used |
e114e473 CS |
1073 | * @buf: where to get the data from |
1074 | * @count: bytes sent | |
1075 | * @ppos: where to start | |
1076 | * | |
1077 | * Returns number of bytes written or error code, as appropriate | |
1078 | */ | |
1079 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1080 | size_t count, loff_t *ppos) | |
1081 | { | |
1082 | char in[SMK_LABELLEN]; | |
4bc87e62 | 1083 | char *oldambient; |
e114e473 CS |
1084 | char *smack; |
1085 | ||
1086 | if (!capable(CAP_MAC_ADMIN)) | |
1087 | return -EPERM; | |
1088 | ||
1089 | if (count >= SMK_LABELLEN) | |
1090 | return -EINVAL; | |
1091 | ||
1092 | if (copy_from_user(in, buf, count) != 0) | |
1093 | return -EFAULT; | |
1094 | ||
1095 | smack = smk_import(in, count); | |
1096 | if (smack == NULL) | |
1097 | return -EINVAL; | |
1098 | ||
4bc87e62 CS |
1099 | mutex_lock(&smack_ambient_lock); |
1100 | ||
1101 | oldambient = smack_net_ambient; | |
e114e473 | 1102 | smack_net_ambient = smack; |
4bc87e62 CS |
1103 | smk_unlbl_ambient(oldambient); |
1104 | ||
1105 | mutex_unlock(&smack_ambient_lock); | |
e114e473 CS |
1106 | |
1107 | return count; | |
1108 | } | |
1109 | ||
1110 | static const struct file_operations smk_ambient_ops = { | |
1111 | .read = smk_read_ambient, | |
1112 | .write = smk_write_ambient, | |
1113 | }; | |
1114 | ||
15446235 CS |
1115 | /** |
1116 | * smk_read_onlycap - read() for /smack/onlycap | |
1117 | * @filp: file pointer, not actually used | |
1118 | * @buf: where to put the result | |
1119 | * @cn: maximum to send along | |
1120 | * @ppos: where to start | |
1121 | * | |
1122 | * Returns number of bytes read or error code, as appropriate | |
1123 | */ | |
1124 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, | |
1125 | size_t cn, loff_t *ppos) | |
1126 | { | |
1127 | char *smack = ""; | |
1128 | ssize_t rc = -EINVAL; | |
1129 | int asize; | |
1130 | ||
1131 | if (*ppos != 0) | |
1132 | return 0; | |
1133 | ||
1134 | if (smack_onlycap != NULL) | |
1135 | smack = smack_onlycap; | |
1136 | ||
1137 | asize = strlen(smack) + 1; | |
1138 | ||
1139 | if (cn >= asize) | |
1140 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
1141 | ||
1142 | return rc; | |
1143 | } | |
1144 | ||
1145 | /** | |
1146 | * smk_write_onlycap - write() for /smack/onlycap | |
251a2a95 | 1147 | * @file: file pointer, not actually used |
15446235 CS |
1148 | * @buf: where to get the data from |
1149 | * @count: bytes sent | |
1150 | * @ppos: where to start | |
1151 | * | |
1152 | * Returns number of bytes written or error code, as appropriate | |
1153 | */ | |
1154 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
1155 | size_t count, loff_t *ppos) | |
1156 | { | |
1157 | char in[SMK_LABELLEN]; | |
b6dff3ec | 1158 | char *sp = current->cred->security; |
15446235 CS |
1159 | |
1160 | if (!capable(CAP_MAC_ADMIN)) | |
1161 | return -EPERM; | |
1162 | ||
1163 | /* | |
1164 | * This can be done using smk_access() but is done | |
1165 | * explicitly for clarity. The smk_access() implementation | |
1166 | * would use smk_access(smack_onlycap, MAY_WRITE) | |
1167 | */ | |
1168 | if (smack_onlycap != NULL && smack_onlycap != sp) | |
1169 | return -EPERM; | |
1170 | ||
1171 | if (count >= SMK_LABELLEN) | |
1172 | return -EINVAL; | |
1173 | ||
1174 | if (copy_from_user(in, buf, count) != 0) | |
1175 | return -EFAULT; | |
1176 | ||
1177 | /* | |
1178 | * Should the null string be passed in unset the onlycap value. | |
1179 | * This seems like something to be careful with as usually | |
1180 | * smk_import only expects to return NULL for errors. It | |
1181 | * is usually the case that a nullstring or "\n" would be | |
1182 | * bad to pass to smk_import but in fact this is useful here. | |
1183 | */ | |
1184 | smack_onlycap = smk_import(in, count); | |
1185 | ||
1186 | return count; | |
1187 | } | |
1188 | ||
1189 | static const struct file_operations smk_onlycap_ops = { | |
1190 | .read = smk_read_onlycap, | |
1191 | .write = smk_write_onlycap, | |
1192 | }; | |
1193 | ||
e114e473 CS |
1194 | /** |
1195 | * smk_fill_super - fill the /smackfs superblock | |
1196 | * @sb: the empty superblock | |
1197 | * @data: unused | |
1198 | * @silent: unused | |
1199 | * | |
1200 | * Fill in the well known entries for /smack | |
1201 | * | |
1202 | * Returns 0 on success, an error code on failure | |
1203 | */ | |
1204 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
1205 | { | |
1206 | int rc; | |
1207 | struct inode *root_inode; | |
1208 | ||
1209 | static struct tree_descr smack_files[] = { | |
1210 | [SMK_LOAD] = | |
1211 | {"load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
1212 | [SMK_CIPSO] = | |
1213 | {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
1214 | [SMK_DOI] = | |
1215 | {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
1216 | [SMK_DIRECT] = | |
1217 | {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
1218 | [SMK_AMBIENT] = | |
1219 | {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
6d3dc07c CS |
1220 | [SMK_NETLBLADDR] = |
1221 | {"netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, | |
15446235 CS |
1222 | [SMK_ONLYCAP] = |
1223 | {"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
e114e473 CS |
1224 | /* last one */ {""} |
1225 | }; | |
1226 | ||
1227 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
1228 | if (rc != 0) { | |
1229 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
1230 | __func__, rc); | |
1231 | return rc; | |
1232 | } | |
1233 | ||
1234 | root_inode = sb->s_root->d_inode; | |
1235 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); | |
1236 | ||
1237 | return 0; | |
1238 | } | |
1239 | ||
1240 | /** | |
1241 | * smk_get_sb - get the smackfs superblock | |
1242 | * @fs_type: passed along without comment | |
1243 | * @flags: passed along without comment | |
1244 | * @dev_name: passed along without comment | |
1245 | * @data: passed along without comment | |
1246 | * @mnt: passed along without comment | |
1247 | * | |
1248 | * Just passes everything along. | |
1249 | * | |
1250 | * Returns what the lower level code does. | |
1251 | */ | |
1252 | static int smk_get_sb(struct file_system_type *fs_type, | |
1253 | int flags, const char *dev_name, void *data, | |
1254 | struct vfsmount *mnt) | |
1255 | { | |
1256 | return get_sb_single(fs_type, flags, data, smk_fill_super, mnt); | |
1257 | } | |
1258 | ||
1259 | static struct file_system_type smk_fs_type = { | |
1260 | .name = "smackfs", | |
1261 | .get_sb = smk_get_sb, | |
1262 | .kill_sb = kill_litter_super, | |
1263 | }; | |
1264 | ||
1265 | static struct vfsmount *smackfs_mount; | |
1266 | ||
1267 | /** | |
1268 | * init_smk_fs - get the smackfs superblock | |
1269 | * | |
1270 | * register the smackfs | |
1271 | * | |
076c54c5 AD |
1272 | * Do not register smackfs if Smack wasn't enabled |
1273 | * on boot. We can not put this method normally under the | |
1274 | * smack_init() code path since the security subsystem get | |
1275 | * initialized before the vfs caches. | |
1276 | * | |
1277 | * Returns true if we were not chosen on boot or if | |
1278 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
1279 | */ |
1280 | static int __init init_smk_fs(void) | |
1281 | { | |
1282 | int err; | |
1283 | ||
076c54c5 AD |
1284 | if (!security_module_enable(&smack_ops)) |
1285 | return 0; | |
1286 | ||
e114e473 CS |
1287 | err = register_filesystem(&smk_fs_type); |
1288 | if (!err) { | |
1289 | smackfs_mount = kern_mount(&smk_fs_type); | |
1290 | if (IS_ERR(smackfs_mount)) { | |
1291 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
1292 | err = PTR_ERR(smackfs_mount); | |
1293 | smackfs_mount = NULL; | |
1294 | } | |
1295 | } | |
1296 | ||
e114e473 | 1297 | smk_cipso_doi(); |
4bc87e62 | 1298 | smk_unlbl_ambient(NULL); |
e114e473 CS |
1299 | |
1300 | return err; | |
1301 | } | |
1302 | ||
1303 | __initcall(init_smk_fs); |