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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> | |
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 */ |
ecfcc53f | 44 | SMK_LOGGING = 10, /* logging */ |
e114e473 CS |
45 | }; |
46 | ||
47 | /* | |
48 | * List locks | |
49 | */ | |
50 | static DEFINE_MUTEX(smack_list_lock); | |
51 | static DEFINE_MUTEX(smack_cipso_lock); | |
4bc87e62 | 52 | static DEFINE_MUTEX(smack_ambient_lock); |
6d3dc07c | 53 | static DEFINE_MUTEX(smk_netlbladdr_lock); |
e114e473 CS |
54 | |
55 | /* | |
56 | * This is the "ambient" label for network traffic. | |
57 | * If it isn't somehow marked, use this. | |
58 | * It can be reset via smackfs/ambient | |
59 | */ | |
60 | char *smack_net_ambient = smack_known_floor.smk_known; | |
61 | ||
e114e473 CS |
62 | /* |
63 | * This is the level in a CIPSO header that indicates a | |
64 | * smack label is contained directly in the category set. | |
65 | * It can be reset via smackfs/direct | |
66 | */ | |
67 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
68 | ||
15446235 CS |
69 | /* |
70 | * Unless a process is running with this label even | |
71 | * having CAP_MAC_OVERRIDE isn't enough to grant | |
72 | * privilege to violate MAC policy. If no label is | |
73 | * designated (the NULL case) capabilities apply to | |
74 | * everyone. It is expected that the hat (^) label | |
75 | * will be used if any label is used. | |
76 | */ | |
77 | char *smack_onlycap; | |
78 | ||
6d3dc07c CS |
79 | /* |
80 | * Certain IP addresses may be designated as single label hosts. | |
81 | * Packets are sent there unlabeled, but only from tasks that | |
82 | * can write to the specified label. | |
83 | */ | |
7198e2ee EB |
84 | |
85 | LIST_HEAD(smk_netlbladdr_list); | |
86 | LIST_HEAD(smack_rule_list); | |
6d3dc07c | 87 | |
e114e473 | 88 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 89 | |
4303154e EB |
90 | const char *smack_cipso_option = SMACK_CIPSO_OPTION; |
91 | ||
92 | ||
e114e473 CS |
93 | #define SEQ_READ_FINISHED 1 |
94 | ||
e114e473 CS |
95 | /* |
96 | * Values for parsing cipso rules | |
97 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
98 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
99 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
100 | */ |
101 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
102 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
103 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
104 | ||
105 | /* | |
106 | * Values for parsing MAC rules | |
107 | * SMK_ACCESS: Maximum possible combination of access permissions | |
108 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
109 | * SMK_LOADLEN: Smack rule length | |
110 | */ | |
111 | #define SMK_ACCESS "rwxa" | |
112 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
113 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
114 | ||
6d3dc07c CS |
115 | /** |
116 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
117 | * @nap: structure to fill | |
118 | */ | |
119 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
120 | { | |
121 | nap->loginuid = audit_get_loginuid(current); | |
122 | nap->sessionid = audit_get_sessionid(current); | |
123 | nap->secid = smack_to_secid(current_security()); | |
124 | } | |
125 | ||
126 | /* | |
127 | * Values for parsing single label host rules | |
128 | * "1.2.3.4 X" | |
129 | * "192.168.138.129/32 abcdefghijklmnopqrstuvw" | |
130 | */ | |
131 | #define SMK_NETLBLADDRMIN 9 | |
132 | #define SMK_NETLBLADDRMAX 42 | |
e114e473 CS |
133 | |
134 | /* | |
135 | * Seq_file read operations for /smack/load | |
136 | */ | |
137 | ||
138 | static void *load_seq_start(struct seq_file *s, loff_t *pos) | |
139 | { | |
140 | if (*pos == SEQ_READ_FINISHED) | |
141 | return NULL; | |
7198e2ee EB |
142 | if (list_empty(&smack_rule_list)) |
143 | return NULL; | |
144 | return smack_rule_list.next; | |
e114e473 CS |
145 | } |
146 | ||
147 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
148 | { | |
7198e2ee | 149 | struct list_head *list = v; |
e114e473 | 150 | |
7198e2ee | 151 | if (list_is_last(list, &smack_rule_list)) { |
e114e473 | 152 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
153 | return NULL; |
154 | } | |
155 | return list->next; | |
e114e473 CS |
156 | } |
157 | ||
158 | static int load_seq_show(struct seq_file *s, void *v) | |
159 | { | |
7198e2ee EB |
160 | struct list_head *list = v; |
161 | struct smack_rule *srp = | |
162 | list_entry(list, struct smack_rule, list); | |
e114e473 CS |
163 | |
164 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
165 | (char *)srp->smk_object); | |
166 | ||
167 | seq_putc(s, ' '); | |
168 | ||
169 | if (srp->smk_access & MAY_READ) | |
170 | seq_putc(s, 'r'); | |
171 | if (srp->smk_access & MAY_WRITE) | |
172 | seq_putc(s, 'w'); | |
173 | if (srp->smk_access & MAY_EXEC) | |
174 | seq_putc(s, 'x'); | |
175 | if (srp->smk_access & MAY_APPEND) | |
176 | seq_putc(s, 'a'); | |
177 | if (srp->smk_access == 0) | |
178 | seq_putc(s, '-'); | |
179 | ||
180 | seq_putc(s, '\n'); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | static void load_seq_stop(struct seq_file *s, void *v) | |
186 | { | |
187 | /* No-op */ | |
188 | } | |
189 | ||
88e9d34c | 190 | static const struct seq_operations load_seq_ops = { |
e114e473 CS |
191 | .start = load_seq_start, |
192 | .next = load_seq_next, | |
193 | .show = load_seq_show, | |
194 | .stop = load_seq_stop, | |
195 | }; | |
196 | ||
197 | /** | |
198 | * smk_open_load - open() for /smack/load | |
199 | * @inode: inode structure representing file | |
200 | * @file: "load" file pointer | |
201 | * | |
202 | * For reading, use load_seq_* seq_file reading operations. | |
203 | */ | |
204 | static int smk_open_load(struct inode *inode, struct file *file) | |
205 | { | |
cb622bbb | 206 | return seq_open(file, &load_seq_ops); |
e114e473 CS |
207 | } |
208 | ||
209 | /** | |
210 | * smk_set_access - add a rule to the rule list | |
211 | * @srp: the new rule to add | |
212 | * | |
213 | * Looks through the current subject/object/access list for | |
214 | * the subject/object pair and replaces the access that was | |
215 | * there. If the pair isn't found add it with the specified | |
216 | * access. | |
81ea714b SL |
217 | * |
218 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails | |
219 | * during the allocation of the new pair to add. | |
e114e473 | 220 | */ |
81ea714b | 221 | static int smk_set_access(struct smack_rule *srp) |
e114e473 | 222 | { |
7198e2ee | 223 | struct smack_rule *sp; |
81ea714b | 224 | int ret = 0; |
7198e2ee | 225 | int found; |
e114e473 CS |
226 | mutex_lock(&smack_list_lock); |
227 | ||
7198e2ee EB |
228 | found = 0; |
229 | list_for_each_entry_rcu(sp, &smack_rule_list, list) { | |
230 | if (sp->smk_subject == srp->smk_subject && | |
231 | sp->smk_object == srp->smk_object) { | |
232 | found = 1; | |
233 | sp->smk_access = srp->smk_access; | |
e114e473 CS |
234 | break; |
235 | } | |
e114e473 | 236 | } |
7198e2ee EB |
237 | if (found == 0) |
238 | list_add_rcu(&srp->list, &smack_rule_list); | |
e114e473 CS |
239 | |
240 | mutex_unlock(&smack_list_lock); | |
241 | ||
81ea714b | 242 | return ret; |
e114e473 CS |
243 | } |
244 | ||
245 | /** | |
246 | * smk_write_load - write() for /smack/load | |
251a2a95 | 247 | * @file: file pointer, not actually used |
e114e473 CS |
248 | * @buf: where to get the data from |
249 | * @count: bytes sent | |
250 | * @ppos: where to start - must be 0 | |
251 | * | |
252 | * Get one smack access rule from above. | |
253 | * The format is exactly: | |
254 | * char subject[SMK_LABELLEN] | |
255 | * char object[SMK_LABELLEN] | |
b500ce8d | 256 | * char access[SMK_ACCESSLEN] |
e114e473 | 257 | * |
b500ce8d | 258 | * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. |
e114e473 | 259 | */ |
e114e473 CS |
260 | static ssize_t smk_write_load(struct file *file, const char __user *buf, |
261 | size_t count, loff_t *ppos) | |
262 | { | |
7198e2ee | 263 | struct smack_rule *rule; |
e114e473 CS |
264 | char *data; |
265 | int rc = -EINVAL; | |
266 | ||
267 | /* | |
268 | * Must have privilege. | |
269 | * No partial writes. | |
270 | * Enough data must be present. | |
271 | */ | |
272 | if (!capable(CAP_MAC_ADMIN)) | |
273 | return -EPERM; | |
7198e2ee EB |
274 | |
275 | if (*ppos != 0 || count != SMK_LOADLEN) | |
e114e473 CS |
276 | return -EINVAL; |
277 | ||
278 | data = kzalloc(count, GFP_KERNEL); | |
279 | if (data == NULL) | |
280 | return -ENOMEM; | |
281 | ||
282 | if (copy_from_user(data, buf, count) != 0) { | |
283 | rc = -EFAULT; | |
284 | goto out; | |
285 | } | |
286 | ||
7198e2ee EB |
287 | rule = kzalloc(sizeof(*rule), GFP_KERNEL); |
288 | if (rule == NULL) { | |
289 | rc = -ENOMEM; | |
e114e473 | 290 | goto out; |
7198e2ee | 291 | } |
e114e473 | 292 | |
7198e2ee EB |
293 | rule->smk_subject = smk_import(data, 0); |
294 | if (rule->smk_subject == NULL) | |
295 | goto out_free_rule; | |
e114e473 | 296 | |
7198e2ee EB |
297 | rule->smk_object = smk_import(data + SMK_LABELLEN, 0); |
298 | if (rule->smk_object == NULL) | |
299 | goto out_free_rule; | |
300 | ||
301 | rule->smk_access = 0; | |
e114e473 CS |
302 | |
303 | switch (data[SMK_LABELLEN + SMK_LABELLEN]) { | |
304 | case '-': | |
305 | break; | |
306 | case 'r': | |
307 | case 'R': | |
7198e2ee | 308 | rule->smk_access |= MAY_READ; |
e114e473 CS |
309 | break; |
310 | default: | |
7198e2ee | 311 | goto out_free_rule; |
e114e473 CS |
312 | } |
313 | ||
314 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { | |
315 | case '-': | |
316 | break; | |
317 | case 'w': | |
318 | case 'W': | |
7198e2ee | 319 | rule->smk_access |= MAY_WRITE; |
e114e473 CS |
320 | break; |
321 | default: | |
7198e2ee | 322 | goto out_free_rule; |
e114e473 CS |
323 | } |
324 | ||
325 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { | |
326 | case '-': | |
327 | break; | |
328 | case 'x': | |
329 | case 'X': | |
7198e2ee | 330 | rule->smk_access |= MAY_EXEC; |
e114e473 CS |
331 | break; |
332 | default: | |
7198e2ee | 333 | goto out_free_rule; |
e114e473 CS |
334 | } |
335 | ||
336 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { | |
337 | case '-': | |
338 | break; | |
339 | case 'a': | |
340 | case 'A': | |
7198e2ee | 341 | rule->smk_access |= MAY_APPEND; |
e114e473 CS |
342 | break; |
343 | default: | |
7198e2ee | 344 | goto out_free_rule; |
e114e473 CS |
345 | } |
346 | ||
7198e2ee | 347 | rc = smk_set_access(rule); |
81ea714b SL |
348 | |
349 | if (!rc) | |
350 | rc = count; | |
7198e2ee | 351 | goto out; |
e114e473 | 352 | |
7198e2ee EB |
353 | out_free_rule: |
354 | kfree(rule); | |
e114e473 CS |
355 | out: |
356 | kfree(data); | |
357 | return rc; | |
358 | } | |
359 | ||
360 | static const struct file_operations smk_load_ops = { | |
361 | .open = smk_open_load, | |
362 | .read = seq_read, | |
363 | .llseek = seq_lseek, | |
364 | .write = smk_write_load, | |
cb622bbb | 365 | .release = seq_release, |
e114e473 CS |
366 | }; |
367 | ||
368 | /** | |
369 | * smk_cipso_doi - initialize the CIPSO domain | |
370 | */ | |
30aa4faf | 371 | static void smk_cipso_doi(void) |
e114e473 CS |
372 | { |
373 | int rc; | |
374 | struct cipso_v4_doi *doip; | |
6d3dc07c | 375 | struct netlbl_audit nai; |
e114e473 | 376 | |
6d3dc07c | 377 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 378 | |
6d3dc07c | 379 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
380 | if (rc != 0) |
381 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
382 | __func__, __LINE__, rc); | |
383 | ||
384 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
385 | if (doip == NULL) | |
386 | panic("smack: Failed to initialize cipso DOI.\n"); | |
387 | doip->map.std = NULL; | |
388 | doip->doi = smk_cipso_doi_value; | |
389 | doip->type = CIPSO_V4_MAP_PASS; | |
390 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
391 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
392 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
393 | ||
6d3dc07c | 394 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 395 | if (rc != 0) { |
6c2e8ac0 PM |
396 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
397 | __func__, __LINE__, rc); | |
398 | kfree(doip); | |
399 | return; | |
400 | } | |
6d3dc07c | 401 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
402 | if (rc != 0) { |
403 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 404 | __func__, __LINE__, rc); |
b1edeb10 | 405 | kfree(doip); |
6c2e8ac0 | 406 | return; |
b1edeb10 | 407 | } |
e114e473 CS |
408 | } |
409 | ||
4bc87e62 CS |
410 | /** |
411 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 412 | * @oldambient: previous domain string |
4bc87e62 | 413 | */ |
30aa4faf | 414 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
415 | { |
416 | int rc; | |
6d3dc07c | 417 | struct netlbl_audit nai; |
4bc87e62 | 418 | |
6d3dc07c | 419 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
420 | |
421 | if (oldambient != NULL) { | |
6d3dc07c | 422 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
423 | if (rc != 0) |
424 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
425 | __func__, __LINE__, rc); | |
426 | } | |
427 | ||
6d3dc07c CS |
428 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET, |
429 | NULL, NULL, &nai); | |
4bc87e62 CS |
430 | if (rc != 0) |
431 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
432 | __func__, __LINE__, rc); | |
433 | } | |
434 | ||
e114e473 CS |
435 | /* |
436 | * Seq_file read operations for /smack/cipso | |
437 | */ | |
438 | ||
439 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
440 | { | |
441 | if (*pos == SEQ_READ_FINISHED) | |
442 | return NULL; | |
7198e2ee EB |
443 | if (list_empty(&smack_known_list)) |
444 | return NULL; | |
e114e473 | 445 | |
7198e2ee | 446 | return smack_known_list.next; |
e114e473 CS |
447 | } |
448 | ||
449 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
450 | { | |
7198e2ee | 451 | struct list_head *list = v; |
e114e473 CS |
452 | |
453 | /* | |
7198e2ee EB |
454 | * labels with no associated cipso value wont be printed |
455 | * in cipso_seq_show | |
e114e473 | 456 | */ |
7198e2ee | 457 | if (list_is_last(list, &smack_known_list)) { |
e114e473 | 458 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
459 | return NULL; |
460 | } | |
e114e473 | 461 | |
7198e2ee | 462 | return list->next; |
e114e473 CS |
463 | } |
464 | ||
465 | /* | |
466 | * Print cipso labels in format: | |
467 | * label level[/cat[,cat]] | |
468 | */ | |
469 | static int cipso_seq_show(struct seq_file *s, void *v) | |
470 | { | |
7198e2ee EB |
471 | struct list_head *list = v; |
472 | struct smack_known *skp = | |
473 | list_entry(list, struct smack_known, list); | |
e114e473 CS |
474 | struct smack_cipso *scp = skp->smk_cipso; |
475 | char *cbp; | |
476 | char sep = '/'; | |
477 | int cat = 1; | |
478 | int i; | |
479 | unsigned char m; | |
480 | ||
481 | if (scp == NULL) | |
482 | return 0; | |
483 | ||
484 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); | |
485 | ||
486 | cbp = scp->smk_catset; | |
487 | for (i = 0; i < SMK_LABELLEN; i++) | |
488 | for (m = 0x80; m != 0; m >>= 1) { | |
489 | if (m & cbp[i]) { | |
490 | seq_printf(s, "%c%d", sep, cat); | |
491 | sep = ','; | |
492 | } | |
493 | cat++; | |
494 | } | |
495 | ||
496 | seq_putc(s, '\n'); | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | static void cipso_seq_stop(struct seq_file *s, void *v) | |
502 | { | |
503 | /* No-op */ | |
504 | } | |
505 | ||
88e9d34c | 506 | static const struct seq_operations cipso_seq_ops = { |
e114e473 CS |
507 | .start = cipso_seq_start, |
508 | .stop = cipso_seq_stop, | |
509 | .next = cipso_seq_next, | |
510 | .show = cipso_seq_show, | |
511 | }; | |
512 | ||
513 | /** | |
514 | * smk_open_cipso - open() for /smack/cipso | |
515 | * @inode: inode structure representing file | |
516 | * @file: "cipso" file pointer | |
517 | * | |
518 | * Connect our cipso_seq_* operations with /smack/cipso | |
519 | * file_operations | |
520 | */ | |
521 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
522 | { | |
523 | return seq_open(file, &cipso_seq_ops); | |
524 | } | |
525 | ||
526 | /** | |
527 | * smk_write_cipso - write() for /smack/cipso | |
251a2a95 | 528 | * @file: file pointer, not actually used |
e114e473 CS |
529 | * @buf: where to get the data from |
530 | * @count: bytes sent | |
531 | * @ppos: where to start | |
532 | * | |
533 | * Accepts only one cipso rule per write call. | |
534 | * Returns number of bytes written or error code, as appropriate | |
535 | */ | |
536 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
537 | size_t count, loff_t *ppos) | |
538 | { | |
539 | struct smack_known *skp; | |
540 | struct smack_cipso *scp = NULL; | |
541 | char mapcatset[SMK_LABELLEN]; | |
542 | int maplevel; | |
543 | int cat; | |
544 | int catlen; | |
545 | ssize_t rc = -EINVAL; | |
546 | char *data = NULL; | |
547 | char *rule; | |
548 | int ret; | |
549 | int i; | |
550 | ||
551 | /* | |
552 | * Must have privilege. | |
553 | * No partial writes. | |
554 | * Enough data must be present. | |
555 | */ | |
556 | if (!capable(CAP_MAC_ADMIN)) | |
557 | return -EPERM; | |
558 | if (*ppos != 0) | |
559 | return -EINVAL; | |
b500ce8d | 560 | if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) |
e114e473 CS |
561 | return -EINVAL; |
562 | ||
563 | data = kzalloc(count + 1, GFP_KERNEL); | |
564 | if (data == NULL) | |
565 | return -ENOMEM; | |
566 | ||
567 | if (copy_from_user(data, buf, count) != 0) { | |
568 | rc = -EFAULT; | |
569 | goto unlockedout; | |
570 | } | |
571 | ||
4303154e EB |
572 | /* labels cannot begin with a '-' */ |
573 | if (data[0] == '-') { | |
574 | rc = -EINVAL; | |
575 | goto unlockedout; | |
576 | } | |
e114e473 CS |
577 | data[count] = '\0'; |
578 | rule = data; | |
579 | /* | |
580 | * Only allow one writer at a time. Writes should be | |
581 | * quite rare and small in any case. | |
582 | */ | |
583 | mutex_lock(&smack_cipso_lock); | |
584 | ||
585 | skp = smk_import_entry(rule, 0); | |
586 | if (skp == NULL) | |
587 | goto out; | |
588 | ||
c19a28e1 | 589 | rule += SMK_LABELLEN; |
e114e473 CS |
590 | ret = sscanf(rule, "%d", &maplevel); |
591 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
592 | goto out; | |
593 | ||
594 | rule += SMK_DIGITLEN; | |
595 | ret = sscanf(rule, "%d", &catlen); | |
596 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
597 | goto out; | |
598 | ||
b500ce8d | 599 | if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
e114e473 CS |
600 | goto out; |
601 | ||
602 | memset(mapcatset, 0, sizeof(mapcatset)); | |
603 | ||
604 | for (i = 0; i < catlen; i++) { | |
605 | rule += SMK_DIGITLEN; | |
606 | ret = sscanf(rule, "%d", &cat); | |
607 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) | |
608 | goto out; | |
609 | ||
610 | smack_catset_bit(cat, mapcatset); | |
611 | } | |
612 | ||
613 | if (skp->smk_cipso == NULL) { | |
614 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); | |
615 | if (scp == NULL) { | |
616 | rc = -ENOMEM; | |
617 | goto out; | |
618 | } | |
619 | } | |
620 | ||
621 | spin_lock_bh(&skp->smk_cipsolock); | |
622 | ||
623 | if (scp == NULL) | |
624 | scp = skp->smk_cipso; | |
625 | else | |
626 | skp->smk_cipso = scp; | |
627 | ||
628 | scp->smk_level = maplevel; | |
629 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); | |
630 | ||
631 | spin_unlock_bh(&skp->smk_cipsolock); | |
632 | ||
633 | rc = count; | |
634 | out: | |
635 | mutex_unlock(&smack_cipso_lock); | |
636 | unlockedout: | |
637 | kfree(data); | |
638 | return rc; | |
639 | } | |
640 | ||
641 | static const struct file_operations smk_cipso_ops = { | |
642 | .open = smk_open_cipso, | |
643 | .read = seq_read, | |
644 | .llseek = seq_lseek, | |
645 | .write = smk_write_cipso, | |
646 | .release = seq_release, | |
647 | }; | |
648 | ||
6d3dc07c CS |
649 | /* |
650 | * Seq_file read operations for /smack/netlabel | |
651 | */ | |
652 | ||
653 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) | |
654 | { | |
655 | if (*pos == SEQ_READ_FINISHED) | |
656 | return NULL; | |
7198e2ee EB |
657 | if (list_empty(&smk_netlbladdr_list)) |
658 | return NULL; | |
659 | return smk_netlbladdr_list.next; | |
6d3dc07c CS |
660 | } |
661 | ||
662 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
663 | { | |
7198e2ee | 664 | struct list_head *list = v; |
6d3dc07c | 665 | |
7198e2ee | 666 | if (list_is_last(list, &smk_netlbladdr_list)) { |
6d3dc07c | 667 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
668 | return NULL; |
669 | } | |
6d3dc07c | 670 | |
7198e2ee | 671 | return list->next; |
6d3dc07c | 672 | } |
6d3dc07c CS |
673 | #define BEBITS (sizeof(__be32) * 8) |
674 | ||
675 | /* | |
676 | * Print host/label pairs | |
677 | */ | |
678 | static int netlbladdr_seq_show(struct seq_file *s, void *v) | |
679 | { | |
7198e2ee EB |
680 | struct list_head *list = v; |
681 | struct smk_netlbladdr *skp = | |
682 | list_entry(list, struct smk_netlbladdr, list); | |
6d3dc07c | 683 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
113a0e45 | 684 | int maskn; |
685 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); | |
6d3dc07c | 686 | |
113a0e45 | 687 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
6d3dc07c CS |
688 | |
689 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", | |
690 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
695 | static void netlbladdr_seq_stop(struct seq_file *s, void *v) | |
696 | { | |
697 | /* No-op */ | |
698 | } | |
699 | ||
88e9d34c | 700 | static const struct seq_operations netlbladdr_seq_ops = { |
6d3dc07c CS |
701 | .start = netlbladdr_seq_start, |
702 | .stop = netlbladdr_seq_stop, | |
703 | .next = netlbladdr_seq_next, | |
704 | .show = netlbladdr_seq_show, | |
705 | }; | |
706 | ||
707 | /** | |
708 | * smk_open_netlbladdr - open() for /smack/netlabel | |
709 | * @inode: inode structure representing file | |
710 | * @file: "netlabel" file pointer | |
711 | * | |
712 | * Connect our netlbladdr_seq_* operations with /smack/netlabel | |
713 | * file_operations | |
714 | */ | |
715 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) | |
716 | { | |
717 | return seq_open(file, &netlbladdr_seq_ops); | |
718 | } | |
719 | ||
113a0e45 | 720 | /** |
721 | * smk_netlbladdr_insert | |
722 | * @new : netlabel to insert | |
723 | * | |
724 | * This helper insert netlabel in the smack_netlbladdrs list | |
725 | * sorted by netmask length (longest to smallest) | |
7198e2ee EB |
726 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
727 | * | |
113a0e45 | 728 | */ |
729 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) | |
730 | { | |
7198e2ee | 731 | struct smk_netlbladdr *m, *m_next; |
113a0e45 | 732 | |
7198e2ee EB |
733 | if (list_empty(&smk_netlbladdr_list)) { |
734 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 735 | return; |
736 | } | |
737 | ||
05725f7e JP |
738 | m = list_entry_rcu(smk_netlbladdr_list.next, |
739 | struct smk_netlbladdr, list); | |
7198e2ee | 740 | |
113a0e45 | 741 | /* the comparison '>' is a bit hacky, but works */ |
7198e2ee EB |
742 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
743 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 744 | return; |
745 | } | |
7198e2ee EB |
746 | |
747 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { | |
748 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { | |
749 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 750 | return; |
751 | } | |
05725f7e JP |
752 | m_next = list_entry_rcu(m->list.next, |
753 | struct smk_netlbladdr, list); | |
7198e2ee EB |
754 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { |
755 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 756 | return; |
757 | } | |
758 | } | |
759 | } | |
760 | ||
761 | ||
6d3dc07c CS |
762 | /** |
763 | * smk_write_netlbladdr - write() for /smack/netlabel | |
251a2a95 | 764 | * @file: file pointer, not actually used |
6d3dc07c CS |
765 | * @buf: where to get the data from |
766 | * @count: bytes sent | |
767 | * @ppos: where to start | |
768 | * | |
769 | * Accepts only one netlbladdr per write call. | |
770 | * Returns number of bytes written or error code, as appropriate | |
771 | */ | |
772 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, | |
773 | size_t count, loff_t *ppos) | |
774 | { | |
775 | struct smk_netlbladdr *skp; | |
776 | struct sockaddr_in newname; | |
777 | char smack[SMK_LABELLEN]; | |
778 | char *sp; | |
6470c077 | 779 | char data[SMK_NETLBLADDRMAX + 1]; |
6d3dc07c CS |
780 | char *host = (char *)&newname.sin_addr.s_addr; |
781 | int rc; | |
782 | struct netlbl_audit audit_info; | |
783 | struct in_addr mask; | |
784 | unsigned int m; | |
7198e2ee | 785 | int found; |
113a0e45 | 786 | u32 mask_bits = (1<<31); |
6d3dc07c | 787 | __be32 nsa; |
113a0e45 | 788 | u32 temp_mask; |
6d3dc07c CS |
789 | |
790 | /* | |
791 | * Must have privilege. | |
792 | * No partial writes. | |
793 | * Enough data must be present. | |
794 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
795 | * "<addr, as a.b.c.d><space><label>" | |
796 | */ | |
797 | if (!capable(CAP_MAC_ADMIN)) | |
798 | return -EPERM; | |
799 | if (*ppos != 0) | |
800 | return -EINVAL; | |
801 | if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX) | |
802 | return -EINVAL; | |
803 | if (copy_from_user(data, buf, count) != 0) | |
804 | return -EFAULT; | |
805 | ||
806 | data[count] = '\0'; | |
807 | ||
808 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", | |
809 | &host[0], &host[1], &host[2], &host[3], &m, smack); | |
810 | if (rc != 6) { | |
811 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
812 | &host[0], &host[1], &host[2], &host[3], smack); | |
813 | if (rc != 5) | |
814 | return -EINVAL; | |
815 | m = BEBITS; | |
816 | } | |
817 | if (m > BEBITS) | |
818 | return -EINVAL; | |
819 | ||
4303154e EB |
820 | /* if smack begins with '-', its an option, don't import it */ |
821 | if (smack[0] != '-') { | |
822 | sp = smk_import(smack, 0); | |
823 | if (sp == NULL) | |
824 | return -EINVAL; | |
825 | } else { | |
826 | /* check known options */ | |
827 | if (strcmp(smack, smack_cipso_option) == 0) | |
828 | sp = (char *)smack_cipso_option; | |
829 | else | |
830 | return -EINVAL; | |
831 | } | |
6d3dc07c | 832 | |
113a0e45 | 833 | for (temp_mask = 0; m > 0; m--) { |
834 | temp_mask |= mask_bits; | |
835 | mask_bits >>= 1; | |
6d3dc07c | 836 | } |
113a0e45 | 837 | mask.s_addr = cpu_to_be32(temp_mask); |
838 | ||
839 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
840 | /* |
841 | * Only allow one writer at a time. Writes should be | |
842 | * quite rare and small in any case. | |
843 | */ | |
844 | mutex_lock(&smk_netlbladdr_lock); | |
845 | ||
846 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 847 | /* try to find if the prefix is already in the list */ |
7198e2ee EB |
848 | found = 0; |
849 | list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { | |
6d3dc07c | 850 | if (skp->smk_host.sin_addr.s_addr == nsa && |
7198e2ee EB |
851 | skp->smk_mask.s_addr == mask.s_addr) { |
852 | found = 1; | |
6d3dc07c | 853 | break; |
7198e2ee EB |
854 | } |
855 | } | |
6d3dc07c CS |
856 | smk_netlabel_audit_set(&audit_info); |
857 | ||
7198e2ee | 858 | if (found == 0) { |
6d3dc07c CS |
859 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
860 | if (skp == NULL) | |
861 | rc = -ENOMEM; | |
862 | else { | |
863 | rc = 0; | |
864 | skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; | |
865 | skp->smk_mask.s_addr = mask.s_addr; | |
6d3dc07c | 866 | skp->smk_label = sp; |
113a0e45 | 867 | smk_netlbladdr_insert(skp); |
6d3dc07c CS |
868 | } |
869 | } else { | |
4303154e EB |
870 | /* we delete the unlabeled entry, only if the previous label |
871 | * wasnt the special CIPSO option */ | |
872 | if (skp->smk_label != smack_cipso_option) | |
873 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, | |
874 | &skp->smk_host.sin_addr, &skp->smk_mask, | |
875 | PF_INET, &audit_info); | |
876 | else | |
877 | rc = 0; | |
6d3dc07c CS |
878 | skp->smk_label = sp; |
879 | } | |
880 | ||
881 | /* | |
882 | * Now tell netlabel about the single label nature of | |
883 | * this host so that incoming packets get labeled. | |
4303154e | 884 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 885 | */ |
4303154e | 886 | if (rc == 0 && sp != smack_cipso_option) |
6d3dc07c CS |
887 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
888 | &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, | |
889 | smack_to_secid(skp->smk_label), &audit_info); | |
890 | ||
891 | if (rc == 0) | |
892 | rc = count; | |
893 | ||
894 | mutex_unlock(&smk_netlbladdr_lock); | |
895 | ||
896 | return rc; | |
897 | } | |
898 | ||
899 | static const struct file_operations smk_netlbladdr_ops = { | |
900 | .open = smk_open_netlbladdr, | |
901 | .read = seq_read, | |
902 | .llseek = seq_lseek, | |
903 | .write = smk_write_netlbladdr, | |
904 | .release = seq_release, | |
905 | }; | |
906 | ||
e114e473 CS |
907 | /** |
908 | * smk_read_doi - read() for /smack/doi | |
909 | * @filp: file pointer, not actually used | |
910 | * @buf: where to put the result | |
911 | * @count: maximum to send along | |
912 | * @ppos: where to start | |
913 | * | |
914 | * Returns number of bytes read or error code, as appropriate | |
915 | */ | |
916 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
917 | size_t count, loff_t *ppos) | |
918 | { | |
919 | char temp[80]; | |
920 | ssize_t rc; | |
921 | ||
922 | if (*ppos != 0) | |
923 | return 0; | |
924 | ||
925 | sprintf(temp, "%d", smk_cipso_doi_value); | |
926 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
927 | ||
928 | return rc; | |
929 | } | |
930 | ||
931 | /** | |
932 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 933 | * @file: file pointer, not actually used |
e114e473 CS |
934 | * @buf: where to get the data from |
935 | * @count: bytes sent | |
936 | * @ppos: where to start | |
937 | * | |
938 | * Returns number of bytes written or error code, as appropriate | |
939 | */ | |
940 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
941 | size_t count, loff_t *ppos) | |
942 | { | |
943 | char temp[80]; | |
944 | int i; | |
945 | ||
946 | if (!capable(CAP_MAC_ADMIN)) | |
947 | return -EPERM; | |
948 | ||
949 | if (count >= sizeof(temp) || count == 0) | |
950 | return -EINVAL; | |
951 | ||
952 | if (copy_from_user(temp, buf, count) != 0) | |
953 | return -EFAULT; | |
954 | ||
955 | temp[count] = '\0'; | |
956 | ||
957 | if (sscanf(temp, "%d", &i) != 1) | |
958 | return -EINVAL; | |
959 | ||
960 | smk_cipso_doi_value = i; | |
961 | ||
962 | smk_cipso_doi(); | |
963 | ||
964 | return count; | |
965 | } | |
966 | ||
967 | static const struct file_operations smk_doi_ops = { | |
968 | .read = smk_read_doi, | |
969 | .write = smk_write_doi, | |
970 | }; | |
971 | ||
972 | /** | |
973 | * smk_read_direct - read() for /smack/direct | |
974 | * @filp: file pointer, not actually used | |
975 | * @buf: where to put the result | |
976 | * @count: maximum to send along | |
977 | * @ppos: where to start | |
978 | * | |
979 | * Returns number of bytes read or error code, as appropriate | |
980 | */ | |
981 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
982 | size_t count, loff_t *ppos) | |
983 | { | |
984 | char temp[80]; | |
985 | ssize_t rc; | |
986 | ||
987 | if (*ppos != 0) | |
988 | return 0; | |
989 | ||
990 | sprintf(temp, "%d", smack_cipso_direct); | |
991 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
992 | ||
993 | return rc; | |
994 | } | |
995 | ||
996 | /** | |
997 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 998 | * @file: file pointer, not actually used |
e114e473 CS |
999 | * @buf: where to get the data from |
1000 | * @count: bytes sent | |
1001 | * @ppos: where to start | |
1002 | * | |
1003 | * Returns number of bytes written or error code, as appropriate | |
1004 | */ | |
1005 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1006 | size_t count, loff_t *ppos) | |
1007 | { | |
1008 | char temp[80]; | |
1009 | int i; | |
1010 | ||
1011 | if (!capable(CAP_MAC_ADMIN)) | |
1012 | return -EPERM; | |
1013 | ||
1014 | if (count >= sizeof(temp) || count == 0) | |
1015 | return -EINVAL; | |
1016 | ||
1017 | if (copy_from_user(temp, buf, count) != 0) | |
1018 | return -EFAULT; | |
1019 | ||
1020 | temp[count] = '\0'; | |
1021 | ||
1022 | if (sscanf(temp, "%d", &i) != 1) | |
1023 | return -EINVAL; | |
1024 | ||
1025 | smack_cipso_direct = i; | |
1026 | ||
1027 | return count; | |
1028 | } | |
1029 | ||
1030 | static const struct file_operations smk_direct_ops = { | |
1031 | .read = smk_read_direct, | |
1032 | .write = smk_write_direct, | |
1033 | }; | |
1034 | ||
1035 | /** | |
1036 | * smk_read_ambient - read() for /smack/ambient | |
1037 | * @filp: file pointer, not actually used | |
1038 | * @buf: where to put the result | |
1039 | * @cn: maximum to send along | |
1040 | * @ppos: where to start | |
1041 | * | |
1042 | * Returns number of bytes read or error code, as appropriate | |
1043 | */ | |
1044 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1045 | size_t cn, loff_t *ppos) | |
1046 | { | |
1047 | ssize_t rc; | |
e114e473 CS |
1048 | int asize; |
1049 | ||
1050 | if (*ppos != 0) | |
1051 | return 0; | |
1052 | /* | |
1053 | * Being careful to avoid a problem in the case where | |
1054 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1055 | */ |
4bc87e62 | 1056 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1057 | |
4bc87e62 CS |
1058 | asize = strlen(smack_net_ambient) + 1; |
1059 | ||
1060 | if (cn >= asize) | |
1061 | rc = simple_read_from_buffer(buf, cn, ppos, | |
1062 | smack_net_ambient, asize); | |
1063 | else | |
1064 | rc = -EINVAL; | |
e114e473 | 1065 | |
4bc87e62 | 1066 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1067 | |
1068 | return rc; | |
1069 | } | |
1070 | ||
1071 | /** | |
1072 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1073 | * @file: file pointer, not actually used |
e114e473 CS |
1074 | * @buf: where to get the data from |
1075 | * @count: bytes sent | |
1076 | * @ppos: where to start | |
1077 | * | |
1078 | * Returns number of bytes written or error code, as appropriate | |
1079 | */ | |
1080 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1081 | size_t count, loff_t *ppos) | |
1082 | { | |
1083 | char in[SMK_LABELLEN]; | |
4bc87e62 | 1084 | char *oldambient; |
e114e473 CS |
1085 | char *smack; |
1086 | ||
1087 | if (!capable(CAP_MAC_ADMIN)) | |
1088 | return -EPERM; | |
1089 | ||
1090 | if (count >= SMK_LABELLEN) | |
1091 | return -EINVAL; | |
1092 | ||
1093 | if (copy_from_user(in, buf, count) != 0) | |
1094 | return -EFAULT; | |
1095 | ||
1096 | smack = smk_import(in, count); | |
1097 | if (smack == NULL) | |
1098 | return -EINVAL; | |
1099 | ||
4bc87e62 CS |
1100 | mutex_lock(&smack_ambient_lock); |
1101 | ||
1102 | oldambient = smack_net_ambient; | |
e114e473 | 1103 | smack_net_ambient = smack; |
4bc87e62 CS |
1104 | smk_unlbl_ambient(oldambient); |
1105 | ||
1106 | mutex_unlock(&smack_ambient_lock); | |
e114e473 CS |
1107 | |
1108 | return count; | |
1109 | } | |
1110 | ||
1111 | static const struct file_operations smk_ambient_ops = { | |
1112 | .read = smk_read_ambient, | |
1113 | .write = smk_write_ambient, | |
1114 | }; | |
1115 | ||
15446235 CS |
1116 | /** |
1117 | * smk_read_onlycap - read() for /smack/onlycap | |
1118 | * @filp: file pointer, not actually used | |
1119 | * @buf: where to put the result | |
1120 | * @cn: maximum to send along | |
1121 | * @ppos: where to start | |
1122 | * | |
1123 | * Returns number of bytes read or error code, as appropriate | |
1124 | */ | |
1125 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, | |
1126 | size_t cn, loff_t *ppos) | |
1127 | { | |
1128 | char *smack = ""; | |
1129 | ssize_t rc = -EINVAL; | |
1130 | int asize; | |
1131 | ||
1132 | if (*ppos != 0) | |
1133 | return 0; | |
1134 | ||
1135 | if (smack_onlycap != NULL) | |
1136 | smack = smack_onlycap; | |
1137 | ||
1138 | asize = strlen(smack) + 1; | |
1139 | ||
1140 | if (cn >= asize) | |
1141 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
1142 | ||
1143 | return rc; | |
1144 | } | |
1145 | ||
1146 | /** | |
1147 | * smk_write_onlycap - write() for /smack/onlycap | |
251a2a95 | 1148 | * @file: file pointer, not actually used |
15446235 CS |
1149 | * @buf: where to get the data from |
1150 | * @count: bytes sent | |
1151 | * @ppos: where to start | |
1152 | * | |
1153 | * Returns number of bytes written or error code, as appropriate | |
1154 | */ | |
1155 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
1156 | size_t count, loff_t *ppos) | |
1157 | { | |
1158 | char in[SMK_LABELLEN]; | |
b6dff3ec | 1159 | char *sp = current->cred->security; |
15446235 CS |
1160 | |
1161 | if (!capable(CAP_MAC_ADMIN)) | |
1162 | return -EPERM; | |
1163 | ||
1164 | /* | |
1165 | * This can be done using smk_access() but is done | |
1166 | * explicitly for clarity. The smk_access() implementation | |
1167 | * would use smk_access(smack_onlycap, MAY_WRITE) | |
1168 | */ | |
1169 | if (smack_onlycap != NULL && smack_onlycap != sp) | |
1170 | return -EPERM; | |
1171 | ||
1172 | if (count >= SMK_LABELLEN) | |
1173 | return -EINVAL; | |
1174 | ||
1175 | if (copy_from_user(in, buf, count) != 0) | |
1176 | return -EFAULT; | |
1177 | ||
1178 | /* | |
1179 | * Should the null string be passed in unset the onlycap value. | |
1180 | * This seems like something to be careful with as usually | |
1181 | * smk_import only expects to return NULL for errors. It | |
1182 | * is usually the case that a nullstring or "\n" would be | |
1183 | * bad to pass to smk_import but in fact this is useful here. | |
1184 | */ | |
1185 | smack_onlycap = smk_import(in, count); | |
1186 | ||
1187 | return count; | |
1188 | } | |
1189 | ||
1190 | static const struct file_operations smk_onlycap_ops = { | |
1191 | .read = smk_read_onlycap, | |
1192 | .write = smk_write_onlycap, | |
1193 | }; | |
1194 | ||
ecfcc53f EB |
1195 | /** |
1196 | * smk_read_logging - read() for /smack/logging | |
1197 | * @filp: file pointer, not actually used | |
1198 | * @buf: where to put the result | |
1199 | * @cn: maximum to send along | |
1200 | * @ppos: where to start | |
1201 | * | |
1202 | * Returns number of bytes read or error code, as appropriate | |
1203 | */ | |
1204 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
1205 | size_t count, loff_t *ppos) | |
1206 | { | |
1207 | char temp[32]; | |
1208 | ssize_t rc; | |
1209 | ||
1210 | if (*ppos != 0) | |
1211 | return 0; | |
1212 | ||
1213 | sprintf(temp, "%d\n", log_policy); | |
1214 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1215 | return rc; | |
1216 | } | |
1217 | ||
1218 | /** | |
1219 | * smk_write_logging - write() for /smack/logging | |
1220 | * @file: file pointer, not actually used | |
1221 | * @buf: where to get the data from | |
1222 | * @count: bytes sent | |
1223 | * @ppos: where to start | |
1224 | * | |
1225 | * Returns number of bytes written or error code, as appropriate | |
1226 | */ | |
1227 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
1228 | size_t count, loff_t *ppos) | |
1229 | { | |
1230 | char temp[32]; | |
1231 | int i; | |
1232 | ||
1233 | if (!capable(CAP_MAC_ADMIN)) | |
1234 | return -EPERM; | |
1235 | ||
1236 | if (count >= sizeof(temp) || count == 0) | |
1237 | return -EINVAL; | |
1238 | ||
1239 | if (copy_from_user(temp, buf, count) != 0) | |
1240 | return -EFAULT; | |
1241 | ||
1242 | temp[count] = '\0'; | |
1243 | ||
1244 | if (sscanf(temp, "%d", &i) != 1) | |
1245 | return -EINVAL; | |
1246 | if (i < 0 || i > 3) | |
1247 | return -EINVAL; | |
1248 | log_policy = i; | |
1249 | return count; | |
1250 | } | |
1251 | ||
1252 | ||
1253 | ||
1254 | static const struct file_operations smk_logging_ops = { | |
1255 | .read = smk_read_logging, | |
1256 | .write = smk_write_logging, | |
1257 | }; | |
e114e473 CS |
1258 | /** |
1259 | * smk_fill_super - fill the /smackfs superblock | |
1260 | * @sb: the empty superblock | |
1261 | * @data: unused | |
1262 | * @silent: unused | |
1263 | * | |
1264 | * Fill in the well known entries for /smack | |
1265 | * | |
1266 | * Returns 0 on success, an error code on failure | |
1267 | */ | |
1268 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
1269 | { | |
1270 | int rc; | |
1271 | struct inode *root_inode; | |
1272 | ||
1273 | static struct tree_descr smack_files[] = { | |
1274 | [SMK_LOAD] = | |
1275 | {"load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
1276 | [SMK_CIPSO] = | |
1277 | {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
1278 | [SMK_DOI] = | |
1279 | {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
1280 | [SMK_DIRECT] = | |
1281 | {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
1282 | [SMK_AMBIENT] = | |
1283 | {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
6d3dc07c CS |
1284 | [SMK_NETLBLADDR] = |
1285 | {"netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, | |
15446235 CS |
1286 | [SMK_ONLYCAP] = |
1287 | {"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
ecfcc53f EB |
1288 | [SMK_LOGGING] = |
1289 | {"logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
e114e473 CS |
1290 | /* last one */ {""} |
1291 | }; | |
1292 | ||
1293 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
1294 | if (rc != 0) { | |
1295 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
1296 | __func__, rc); | |
1297 | return rc; | |
1298 | } | |
1299 | ||
1300 | root_inode = sb->s_root->d_inode; | |
1301 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); | |
1302 | ||
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | /** | |
1307 | * smk_get_sb - get the smackfs superblock | |
1308 | * @fs_type: passed along without comment | |
1309 | * @flags: passed along without comment | |
1310 | * @dev_name: passed along without comment | |
1311 | * @data: passed along without comment | |
1312 | * @mnt: passed along without comment | |
1313 | * | |
1314 | * Just passes everything along. | |
1315 | * | |
1316 | * Returns what the lower level code does. | |
1317 | */ | |
1318 | static int smk_get_sb(struct file_system_type *fs_type, | |
1319 | int flags, const char *dev_name, void *data, | |
1320 | struct vfsmount *mnt) | |
1321 | { | |
1322 | return get_sb_single(fs_type, flags, data, smk_fill_super, mnt); | |
1323 | } | |
1324 | ||
1325 | static struct file_system_type smk_fs_type = { | |
1326 | .name = "smackfs", | |
1327 | .get_sb = smk_get_sb, | |
1328 | .kill_sb = kill_litter_super, | |
1329 | }; | |
1330 | ||
1331 | static struct vfsmount *smackfs_mount; | |
1332 | ||
1333 | /** | |
1334 | * init_smk_fs - get the smackfs superblock | |
1335 | * | |
1336 | * register the smackfs | |
1337 | * | |
076c54c5 AD |
1338 | * Do not register smackfs if Smack wasn't enabled |
1339 | * on boot. We can not put this method normally under the | |
1340 | * smack_init() code path since the security subsystem get | |
1341 | * initialized before the vfs caches. | |
1342 | * | |
1343 | * Returns true if we were not chosen on boot or if | |
1344 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
1345 | */ |
1346 | static int __init init_smk_fs(void) | |
1347 | { | |
1348 | int err; | |
1349 | ||
076c54c5 AD |
1350 | if (!security_module_enable(&smack_ops)) |
1351 | return 0; | |
1352 | ||
e114e473 CS |
1353 | err = register_filesystem(&smk_fs_type); |
1354 | if (!err) { | |
1355 | smackfs_mount = kern_mount(&smk_fs_type); | |
1356 | if (IS_ERR(smackfs_mount)) { | |
1357 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
1358 | err = PTR_ERR(smackfs_mount); | |
1359 | smackfs_mount = NULL; | |
1360 | } | |
1361 | } | |
1362 | ||
e114e473 | 1363 | smk_cipso_doi(); |
4bc87e62 | 1364 | smk_unlbl_ambient(NULL); |
e114e473 CS |
1365 | |
1366 | return err; | |
1367 | } | |
1368 | ||
1369 | __initcall(init_smk_fs); |