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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> | |
23 | #include <net/netlabel.h> | |
24 | #include <net/cipso_ipv4.h> | |
25 | #include <linux/seq_file.h> | |
26 | #include <linux/ctype.h> | |
4bc87e62 | 27 | #include <linux/audit.h> |
e114e473 CS |
28 | #include "smack.h" |
29 | ||
30 | /* | |
31 | * smackfs pseudo filesystem. | |
32 | */ | |
33 | ||
34 | enum smk_inos { | |
35 | SMK_ROOT_INO = 2, | |
36 | SMK_LOAD = 3, /* load policy */ | |
37 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ | |
38 | SMK_DOI = 5, /* CIPSO DOI */ | |
39 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ | |
40 | SMK_AMBIENT = 7, /* internet ambient label */ | |
41 | SMK_NLTYPE = 8, /* label scheme to use by default */ | |
42 | }; | |
43 | ||
44 | /* | |
45 | * List locks | |
46 | */ | |
47 | static DEFINE_MUTEX(smack_list_lock); | |
48 | static DEFINE_MUTEX(smack_cipso_lock); | |
4bc87e62 | 49 | static DEFINE_MUTEX(smack_ambient_lock); |
e114e473 CS |
50 | |
51 | /* | |
52 | * This is the "ambient" label for network traffic. | |
53 | * If it isn't somehow marked, use this. | |
54 | * It can be reset via smackfs/ambient | |
55 | */ | |
56 | char *smack_net_ambient = smack_known_floor.smk_known; | |
57 | ||
58 | /* | |
59 | * This is the default packet marking scheme for network traffic. | |
60 | * It can be reset via smackfs/nltype | |
61 | */ | |
62 | int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4; | |
63 | ||
64 | /* | |
65 | * This is the level in a CIPSO header that indicates a | |
66 | * smack label is contained directly in the category set. | |
67 | * It can be reset via smackfs/direct | |
68 | */ | |
69 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
70 | ||
71 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; | |
72 | struct smk_list_entry *smack_list; | |
73 | ||
74 | #define SEQ_READ_FINISHED 1 | |
75 | ||
e114e473 CS |
76 | /* |
77 | * Values for parsing cipso rules | |
78 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
79 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
80 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
81 | */ |
82 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
83 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
84 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
85 | ||
86 | /* | |
87 | * Values for parsing MAC rules | |
88 | * SMK_ACCESS: Maximum possible combination of access permissions | |
89 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
90 | * SMK_LOADLEN: Smack rule length | |
91 | */ | |
92 | #define SMK_ACCESS "rwxa" | |
93 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
94 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
95 | ||
e114e473 CS |
96 | |
97 | /* | |
98 | * Seq_file read operations for /smack/load | |
99 | */ | |
100 | ||
101 | static void *load_seq_start(struct seq_file *s, loff_t *pos) | |
102 | { | |
103 | if (*pos == SEQ_READ_FINISHED) | |
104 | return NULL; | |
105 | ||
106 | return smack_list; | |
107 | } | |
108 | ||
109 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
110 | { | |
111 | struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next; | |
112 | ||
113 | if (skp == NULL) | |
114 | *pos = SEQ_READ_FINISHED; | |
115 | ||
116 | return skp; | |
117 | } | |
118 | ||
119 | static int load_seq_show(struct seq_file *s, void *v) | |
120 | { | |
121 | struct smk_list_entry *slp = (struct smk_list_entry *) v; | |
122 | struct smack_rule *srp = &slp->smk_rule; | |
123 | ||
124 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
125 | (char *)srp->smk_object); | |
126 | ||
127 | seq_putc(s, ' '); | |
128 | ||
129 | if (srp->smk_access & MAY_READ) | |
130 | seq_putc(s, 'r'); | |
131 | if (srp->smk_access & MAY_WRITE) | |
132 | seq_putc(s, 'w'); | |
133 | if (srp->smk_access & MAY_EXEC) | |
134 | seq_putc(s, 'x'); | |
135 | if (srp->smk_access & MAY_APPEND) | |
136 | seq_putc(s, 'a'); | |
137 | if (srp->smk_access == 0) | |
138 | seq_putc(s, '-'); | |
139 | ||
140 | seq_putc(s, '\n'); | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static void load_seq_stop(struct seq_file *s, void *v) | |
146 | { | |
147 | /* No-op */ | |
148 | } | |
149 | ||
150 | static struct seq_operations load_seq_ops = { | |
151 | .start = load_seq_start, | |
152 | .next = load_seq_next, | |
153 | .show = load_seq_show, | |
154 | .stop = load_seq_stop, | |
155 | }; | |
156 | ||
157 | /** | |
158 | * smk_open_load - open() for /smack/load | |
159 | * @inode: inode structure representing file | |
160 | * @file: "load" file pointer | |
161 | * | |
162 | * For reading, use load_seq_* seq_file reading operations. | |
163 | */ | |
164 | static int smk_open_load(struct inode *inode, struct file *file) | |
165 | { | |
cb622bbb | 166 | return seq_open(file, &load_seq_ops); |
e114e473 CS |
167 | } |
168 | ||
169 | /** | |
170 | * smk_set_access - add a rule to the rule list | |
171 | * @srp: the new rule to add | |
172 | * | |
173 | * Looks through the current subject/object/access list for | |
174 | * the subject/object pair and replaces the access that was | |
175 | * there. If the pair isn't found add it with the specified | |
176 | * access. | |
177 | */ | |
178 | static void smk_set_access(struct smack_rule *srp) | |
179 | { | |
180 | struct smk_list_entry *sp; | |
181 | struct smk_list_entry *newp; | |
182 | ||
183 | mutex_lock(&smack_list_lock); | |
184 | ||
185 | for (sp = smack_list; sp != NULL; sp = sp->smk_next) | |
186 | if (sp->smk_rule.smk_subject == srp->smk_subject && | |
187 | sp->smk_rule.smk_object == srp->smk_object) { | |
188 | sp->smk_rule.smk_access = srp->smk_access; | |
189 | break; | |
190 | } | |
191 | ||
192 | if (sp == NULL) { | |
193 | newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL); | |
194 | newp->smk_rule = *srp; | |
195 | newp->smk_next = smack_list; | |
196 | smack_list = newp; | |
197 | } | |
198 | ||
199 | mutex_unlock(&smack_list_lock); | |
200 | ||
201 | return; | |
202 | } | |
203 | ||
204 | /** | |
205 | * smk_write_load - write() for /smack/load | |
206 | * @filp: file pointer, not actually used | |
207 | * @buf: where to get the data from | |
208 | * @count: bytes sent | |
209 | * @ppos: where to start - must be 0 | |
210 | * | |
211 | * Get one smack access rule from above. | |
212 | * The format is exactly: | |
213 | * char subject[SMK_LABELLEN] | |
214 | * char object[SMK_LABELLEN] | |
b500ce8d | 215 | * char access[SMK_ACCESSLEN] |
e114e473 | 216 | * |
b500ce8d | 217 | * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. |
e114e473 | 218 | */ |
e114e473 CS |
219 | static ssize_t smk_write_load(struct file *file, const char __user *buf, |
220 | size_t count, loff_t *ppos) | |
221 | { | |
222 | struct smack_rule rule; | |
223 | char *data; | |
224 | int rc = -EINVAL; | |
225 | ||
226 | /* | |
227 | * Must have privilege. | |
228 | * No partial writes. | |
229 | * Enough data must be present. | |
230 | */ | |
231 | if (!capable(CAP_MAC_ADMIN)) | |
232 | return -EPERM; | |
233 | if (*ppos != 0) | |
234 | return -EINVAL; | |
b500ce8d | 235 | if (count != SMK_LOADLEN) |
e114e473 CS |
236 | return -EINVAL; |
237 | ||
238 | data = kzalloc(count, GFP_KERNEL); | |
239 | if (data == NULL) | |
240 | return -ENOMEM; | |
241 | ||
242 | if (copy_from_user(data, buf, count) != 0) { | |
243 | rc = -EFAULT; | |
244 | goto out; | |
245 | } | |
246 | ||
247 | rule.smk_subject = smk_import(data, 0); | |
248 | if (rule.smk_subject == NULL) | |
249 | goto out; | |
250 | ||
251 | rule.smk_object = smk_import(data + SMK_LABELLEN, 0); | |
252 | if (rule.smk_object == NULL) | |
253 | goto out; | |
254 | ||
255 | rule.smk_access = 0; | |
256 | ||
257 | switch (data[SMK_LABELLEN + SMK_LABELLEN]) { | |
258 | case '-': | |
259 | break; | |
260 | case 'r': | |
261 | case 'R': | |
262 | rule.smk_access |= MAY_READ; | |
263 | break; | |
264 | default: | |
265 | goto out; | |
266 | } | |
267 | ||
268 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { | |
269 | case '-': | |
270 | break; | |
271 | case 'w': | |
272 | case 'W': | |
273 | rule.smk_access |= MAY_WRITE; | |
274 | break; | |
275 | default: | |
276 | goto out; | |
277 | } | |
278 | ||
279 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { | |
280 | case '-': | |
281 | break; | |
282 | case 'x': | |
283 | case 'X': | |
284 | rule.smk_access |= MAY_EXEC; | |
285 | break; | |
286 | default: | |
287 | goto out; | |
288 | } | |
289 | ||
290 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { | |
291 | case '-': | |
292 | break; | |
293 | case 'a': | |
294 | case 'A': | |
295 | rule.smk_access |= MAY_READ; | |
296 | break; | |
297 | default: | |
298 | goto out; | |
299 | } | |
300 | ||
301 | smk_set_access(&rule); | |
302 | rc = count; | |
303 | ||
304 | out: | |
305 | kfree(data); | |
306 | return rc; | |
307 | } | |
308 | ||
309 | static const struct file_operations smk_load_ops = { | |
310 | .open = smk_open_load, | |
311 | .read = seq_read, | |
312 | .llseek = seq_lseek, | |
313 | .write = smk_write_load, | |
cb622bbb | 314 | .release = seq_release, |
e114e473 CS |
315 | }; |
316 | ||
317 | /** | |
318 | * smk_cipso_doi - initialize the CIPSO domain | |
319 | */ | |
30aa4faf | 320 | static void smk_cipso_doi(void) |
e114e473 CS |
321 | { |
322 | int rc; | |
323 | struct cipso_v4_doi *doip; | |
324 | struct netlbl_audit audit_info; | |
325 | ||
4bc87e62 | 326 | audit_info.loginuid = audit_get_loginuid(current); |
2532386f | 327 | audit_info.sessionid = audit_get_sessionid(current); |
4bc87e62 CS |
328 | audit_info.secid = smack_to_secid(current->security); |
329 | ||
e114e473 CS |
330 | rc = netlbl_cfg_map_del(NULL, &audit_info); |
331 | if (rc != 0) | |
332 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
333 | __func__, __LINE__, rc); | |
334 | ||
335 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
336 | if (doip == NULL) | |
337 | panic("smack: Failed to initialize cipso DOI.\n"); | |
338 | doip->map.std = NULL; | |
339 | doip->doi = smk_cipso_doi_value; | |
340 | doip->type = CIPSO_V4_MAP_PASS; | |
341 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
342 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
343 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
344 | ||
345 | rc = netlbl_cfg_cipsov4_add_map(doip, NULL, &audit_info); | |
346 | if (rc != 0) | |
347 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
348 | __func__, __LINE__, rc); | |
349 | } | |
350 | ||
4bc87e62 CS |
351 | /** |
352 | * smk_unlbl_ambient - initialize the unlabeled domain | |
353 | */ | |
30aa4faf | 354 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
355 | { |
356 | int rc; | |
357 | struct netlbl_audit audit_info; | |
358 | ||
359 | audit_info.loginuid = audit_get_loginuid(current); | |
2532386f | 360 | audit_info.sessionid = audit_get_sessionid(current); |
4bc87e62 CS |
361 | audit_info.secid = smack_to_secid(current->security); |
362 | ||
363 | if (oldambient != NULL) { | |
364 | rc = netlbl_cfg_map_del(oldambient, &audit_info); | |
365 | if (rc != 0) | |
366 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
367 | __func__, __LINE__, rc); | |
368 | } | |
369 | ||
370 | rc = netlbl_cfg_unlbl_add_map(smack_net_ambient, &audit_info); | |
371 | if (rc != 0) | |
372 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
373 | __func__, __LINE__, rc); | |
374 | } | |
375 | ||
e114e473 CS |
376 | /* |
377 | * Seq_file read operations for /smack/cipso | |
378 | */ | |
379 | ||
380 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
381 | { | |
382 | if (*pos == SEQ_READ_FINISHED) | |
383 | return NULL; | |
384 | ||
385 | return smack_known; | |
386 | } | |
387 | ||
388 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
389 | { | |
390 | struct smack_known *skp = ((struct smack_known *) v)->smk_next; | |
391 | ||
392 | /* | |
393 | * Omit labels with no associated cipso value | |
394 | */ | |
395 | while (skp != NULL && !skp->smk_cipso) | |
396 | skp = skp->smk_next; | |
397 | ||
398 | if (skp == NULL) | |
399 | *pos = SEQ_READ_FINISHED; | |
400 | ||
401 | return skp; | |
402 | } | |
403 | ||
404 | /* | |
405 | * Print cipso labels in format: | |
406 | * label level[/cat[,cat]] | |
407 | */ | |
408 | static int cipso_seq_show(struct seq_file *s, void *v) | |
409 | { | |
410 | struct smack_known *skp = (struct smack_known *) v; | |
411 | struct smack_cipso *scp = skp->smk_cipso; | |
412 | char *cbp; | |
413 | char sep = '/'; | |
414 | int cat = 1; | |
415 | int i; | |
416 | unsigned char m; | |
417 | ||
418 | if (scp == NULL) | |
419 | return 0; | |
420 | ||
421 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); | |
422 | ||
423 | cbp = scp->smk_catset; | |
424 | for (i = 0; i < SMK_LABELLEN; i++) | |
425 | for (m = 0x80; m != 0; m >>= 1) { | |
426 | if (m & cbp[i]) { | |
427 | seq_printf(s, "%c%d", sep, cat); | |
428 | sep = ','; | |
429 | } | |
430 | cat++; | |
431 | } | |
432 | ||
433 | seq_putc(s, '\n'); | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | static void cipso_seq_stop(struct seq_file *s, void *v) | |
439 | { | |
440 | /* No-op */ | |
441 | } | |
442 | ||
443 | static struct seq_operations cipso_seq_ops = { | |
444 | .start = cipso_seq_start, | |
445 | .stop = cipso_seq_stop, | |
446 | .next = cipso_seq_next, | |
447 | .show = cipso_seq_show, | |
448 | }; | |
449 | ||
450 | /** | |
451 | * smk_open_cipso - open() for /smack/cipso | |
452 | * @inode: inode structure representing file | |
453 | * @file: "cipso" file pointer | |
454 | * | |
455 | * Connect our cipso_seq_* operations with /smack/cipso | |
456 | * file_operations | |
457 | */ | |
458 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
459 | { | |
460 | return seq_open(file, &cipso_seq_ops); | |
461 | } | |
462 | ||
463 | /** | |
464 | * smk_write_cipso - write() for /smack/cipso | |
465 | * @filp: file pointer, not actually used | |
466 | * @buf: where to get the data from | |
467 | * @count: bytes sent | |
468 | * @ppos: where to start | |
469 | * | |
470 | * Accepts only one cipso rule per write call. | |
471 | * Returns number of bytes written or error code, as appropriate | |
472 | */ | |
473 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
474 | size_t count, loff_t *ppos) | |
475 | { | |
476 | struct smack_known *skp; | |
477 | struct smack_cipso *scp = NULL; | |
478 | char mapcatset[SMK_LABELLEN]; | |
479 | int maplevel; | |
480 | int cat; | |
481 | int catlen; | |
482 | ssize_t rc = -EINVAL; | |
483 | char *data = NULL; | |
484 | char *rule; | |
485 | int ret; | |
486 | int i; | |
487 | ||
488 | /* | |
489 | * Must have privilege. | |
490 | * No partial writes. | |
491 | * Enough data must be present. | |
492 | */ | |
493 | if (!capable(CAP_MAC_ADMIN)) | |
494 | return -EPERM; | |
495 | if (*ppos != 0) | |
496 | return -EINVAL; | |
b500ce8d | 497 | if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) |
e114e473 CS |
498 | return -EINVAL; |
499 | ||
500 | data = kzalloc(count + 1, GFP_KERNEL); | |
501 | if (data == NULL) | |
502 | return -ENOMEM; | |
503 | ||
504 | if (copy_from_user(data, buf, count) != 0) { | |
505 | rc = -EFAULT; | |
506 | goto unlockedout; | |
507 | } | |
508 | ||
509 | data[count] = '\0'; | |
510 | rule = data; | |
511 | /* | |
512 | * Only allow one writer at a time. Writes should be | |
513 | * quite rare and small in any case. | |
514 | */ | |
515 | mutex_lock(&smack_cipso_lock); | |
516 | ||
517 | skp = smk_import_entry(rule, 0); | |
518 | if (skp == NULL) | |
519 | goto out; | |
520 | ||
521 | rule += SMK_LABELLEN;; | |
522 | ret = sscanf(rule, "%d", &maplevel); | |
523 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
524 | goto out; | |
525 | ||
526 | rule += SMK_DIGITLEN; | |
527 | ret = sscanf(rule, "%d", &catlen); | |
528 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
529 | goto out; | |
530 | ||
b500ce8d | 531 | if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
e114e473 CS |
532 | goto out; |
533 | ||
534 | memset(mapcatset, 0, sizeof(mapcatset)); | |
535 | ||
536 | for (i = 0; i < catlen; i++) { | |
537 | rule += SMK_DIGITLEN; | |
538 | ret = sscanf(rule, "%d", &cat); | |
539 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) | |
540 | goto out; | |
541 | ||
542 | smack_catset_bit(cat, mapcatset); | |
543 | } | |
544 | ||
545 | if (skp->smk_cipso == NULL) { | |
546 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); | |
547 | if (scp == NULL) { | |
548 | rc = -ENOMEM; | |
549 | goto out; | |
550 | } | |
551 | } | |
552 | ||
553 | spin_lock_bh(&skp->smk_cipsolock); | |
554 | ||
555 | if (scp == NULL) | |
556 | scp = skp->smk_cipso; | |
557 | else | |
558 | skp->smk_cipso = scp; | |
559 | ||
560 | scp->smk_level = maplevel; | |
561 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); | |
562 | ||
563 | spin_unlock_bh(&skp->smk_cipsolock); | |
564 | ||
565 | rc = count; | |
566 | out: | |
567 | mutex_unlock(&smack_cipso_lock); | |
568 | unlockedout: | |
569 | kfree(data); | |
570 | return rc; | |
571 | } | |
572 | ||
573 | static const struct file_operations smk_cipso_ops = { | |
574 | .open = smk_open_cipso, | |
575 | .read = seq_read, | |
576 | .llseek = seq_lseek, | |
577 | .write = smk_write_cipso, | |
578 | .release = seq_release, | |
579 | }; | |
580 | ||
581 | /** | |
582 | * smk_read_doi - read() for /smack/doi | |
583 | * @filp: file pointer, not actually used | |
584 | * @buf: where to put the result | |
585 | * @count: maximum to send along | |
586 | * @ppos: where to start | |
587 | * | |
588 | * Returns number of bytes read or error code, as appropriate | |
589 | */ | |
590 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
591 | size_t count, loff_t *ppos) | |
592 | { | |
593 | char temp[80]; | |
594 | ssize_t rc; | |
595 | ||
596 | if (*ppos != 0) | |
597 | return 0; | |
598 | ||
599 | sprintf(temp, "%d", smk_cipso_doi_value); | |
600 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
601 | ||
602 | return rc; | |
603 | } | |
604 | ||
605 | /** | |
606 | * smk_write_doi - write() for /smack/doi | |
607 | * @filp: file pointer, not actually used | |
608 | * @buf: where to get the data from | |
609 | * @count: bytes sent | |
610 | * @ppos: where to start | |
611 | * | |
612 | * Returns number of bytes written or error code, as appropriate | |
613 | */ | |
614 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
615 | size_t count, loff_t *ppos) | |
616 | { | |
617 | char temp[80]; | |
618 | int i; | |
619 | ||
620 | if (!capable(CAP_MAC_ADMIN)) | |
621 | return -EPERM; | |
622 | ||
623 | if (count >= sizeof(temp) || count == 0) | |
624 | return -EINVAL; | |
625 | ||
626 | if (copy_from_user(temp, buf, count) != 0) | |
627 | return -EFAULT; | |
628 | ||
629 | temp[count] = '\0'; | |
630 | ||
631 | if (sscanf(temp, "%d", &i) != 1) | |
632 | return -EINVAL; | |
633 | ||
634 | smk_cipso_doi_value = i; | |
635 | ||
636 | smk_cipso_doi(); | |
637 | ||
638 | return count; | |
639 | } | |
640 | ||
641 | static const struct file_operations smk_doi_ops = { | |
642 | .read = smk_read_doi, | |
643 | .write = smk_write_doi, | |
644 | }; | |
645 | ||
646 | /** | |
647 | * smk_read_direct - read() for /smack/direct | |
648 | * @filp: file pointer, not actually used | |
649 | * @buf: where to put the result | |
650 | * @count: maximum to send along | |
651 | * @ppos: where to start | |
652 | * | |
653 | * Returns number of bytes read or error code, as appropriate | |
654 | */ | |
655 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
656 | size_t count, loff_t *ppos) | |
657 | { | |
658 | char temp[80]; | |
659 | ssize_t rc; | |
660 | ||
661 | if (*ppos != 0) | |
662 | return 0; | |
663 | ||
664 | sprintf(temp, "%d", smack_cipso_direct); | |
665 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
666 | ||
667 | return rc; | |
668 | } | |
669 | ||
670 | /** | |
671 | * smk_write_direct - write() for /smack/direct | |
672 | * @filp: file pointer, not actually used | |
673 | * @buf: where to get the data from | |
674 | * @count: bytes sent | |
675 | * @ppos: where to start | |
676 | * | |
677 | * Returns number of bytes written or error code, as appropriate | |
678 | */ | |
679 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
680 | size_t count, loff_t *ppos) | |
681 | { | |
682 | char temp[80]; | |
683 | int i; | |
684 | ||
685 | if (!capable(CAP_MAC_ADMIN)) | |
686 | return -EPERM; | |
687 | ||
688 | if (count >= sizeof(temp) || count == 0) | |
689 | return -EINVAL; | |
690 | ||
691 | if (copy_from_user(temp, buf, count) != 0) | |
692 | return -EFAULT; | |
693 | ||
694 | temp[count] = '\0'; | |
695 | ||
696 | if (sscanf(temp, "%d", &i) != 1) | |
697 | return -EINVAL; | |
698 | ||
699 | smack_cipso_direct = i; | |
700 | ||
701 | return count; | |
702 | } | |
703 | ||
704 | static const struct file_operations smk_direct_ops = { | |
705 | .read = smk_read_direct, | |
706 | .write = smk_write_direct, | |
707 | }; | |
708 | ||
709 | /** | |
710 | * smk_read_ambient - read() for /smack/ambient | |
711 | * @filp: file pointer, not actually used | |
712 | * @buf: where to put the result | |
713 | * @cn: maximum to send along | |
714 | * @ppos: where to start | |
715 | * | |
716 | * Returns number of bytes read or error code, as appropriate | |
717 | */ | |
718 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
719 | size_t cn, loff_t *ppos) | |
720 | { | |
721 | ssize_t rc; | |
e114e473 CS |
722 | int asize; |
723 | ||
724 | if (*ppos != 0) | |
725 | return 0; | |
726 | /* | |
727 | * Being careful to avoid a problem in the case where | |
728 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 729 | */ |
4bc87e62 | 730 | mutex_lock(&smack_ambient_lock); |
e114e473 | 731 | |
4bc87e62 CS |
732 | asize = strlen(smack_net_ambient) + 1; |
733 | ||
734 | if (cn >= asize) | |
735 | rc = simple_read_from_buffer(buf, cn, ppos, | |
736 | smack_net_ambient, asize); | |
737 | else | |
738 | rc = -EINVAL; | |
e114e473 | 739 | |
4bc87e62 | 740 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
741 | |
742 | return rc; | |
743 | } | |
744 | ||
745 | /** | |
746 | * smk_write_ambient - write() for /smack/ambient | |
747 | * @filp: file pointer, not actually used | |
748 | * @buf: where to get the data from | |
749 | * @count: bytes sent | |
750 | * @ppos: where to start | |
751 | * | |
752 | * Returns number of bytes written or error code, as appropriate | |
753 | */ | |
754 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
755 | size_t count, loff_t *ppos) | |
756 | { | |
757 | char in[SMK_LABELLEN]; | |
4bc87e62 | 758 | char *oldambient; |
e114e473 CS |
759 | char *smack; |
760 | ||
761 | if (!capable(CAP_MAC_ADMIN)) | |
762 | return -EPERM; | |
763 | ||
764 | if (count >= SMK_LABELLEN) | |
765 | return -EINVAL; | |
766 | ||
767 | if (copy_from_user(in, buf, count) != 0) | |
768 | return -EFAULT; | |
769 | ||
770 | smack = smk_import(in, count); | |
771 | if (smack == NULL) | |
772 | return -EINVAL; | |
773 | ||
4bc87e62 CS |
774 | mutex_lock(&smack_ambient_lock); |
775 | ||
776 | oldambient = smack_net_ambient; | |
e114e473 | 777 | smack_net_ambient = smack; |
4bc87e62 CS |
778 | smk_unlbl_ambient(oldambient); |
779 | ||
780 | mutex_unlock(&smack_ambient_lock); | |
e114e473 CS |
781 | |
782 | return count; | |
783 | } | |
784 | ||
785 | static const struct file_operations smk_ambient_ops = { | |
786 | .read = smk_read_ambient, | |
787 | .write = smk_write_ambient, | |
788 | }; | |
789 | ||
790 | struct option_names { | |
791 | int o_number; | |
792 | char *o_name; | |
793 | char *o_alias; | |
794 | }; | |
795 | ||
796 | static struct option_names netlbl_choices[] = { | |
797 | { NETLBL_NLTYPE_RIPSO, | |
798 | NETLBL_NLTYPE_RIPSO_NAME, "ripso" }, | |
799 | { NETLBL_NLTYPE_CIPSOV4, | |
800 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" }, | |
801 | { NETLBL_NLTYPE_CIPSOV4, | |
802 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" }, | |
803 | { NETLBL_NLTYPE_CIPSOV6, | |
804 | NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" }, | |
805 | { NETLBL_NLTYPE_UNLABELED, | |
806 | NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" }, | |
807 | }; | |
808 | ||
809 | /** | |
810 | * smk_read_nltype - read() for /smack/nltype | |
811 | * @filp: file pointer, not actually used | |
812 | * @buf: where to put the result | |
813 | * @count: maximum to send along | |
814 | * @ppos: where to start | |
815 | * | |
816 | * Returns number of bytes read or error code, as appropriate | |
817 | */ | |
818 | static ssize_t smk_read_nltype(struct file *filp, char __user *buf, | |
819 | size_t count, loff_t *ppos) | |
820 | { | |
821 | char bound[40]; | |
822 | ssize_t rc; | |
823 | int i; | |
824 | ||
825 | if (count < SMK_LABELLEN) | |
826 | return -EINVAL; | |
827 | ||
828 | if (*ppos != 0) | |
829 | return 0; | |
830 | ||
831 | sprintf(bound, "unknown"); | |
832 | ||
833 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) | |
834 | if (smack_net_nltype == netlbl_choices[i].o_number) { | |
835 | sprintf(bound, "%s", netlbl_choices[i].o_name); | |
836 | break; | |
837 | } | |
838 | ||
839 | rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound)); | |
840 | ||
841 | return rc; | |
842 | } | |
843 | ||
844 | /** | |
845 | * smk_write_nltype - write() for /smack/nltype | |
846 | * @filp: file pointer, not actually used | |
847 | * @buf: where to get the data from | |
848 | * @count: bytes sent | |
849 | * @ppos: where to start | |
850 | * | |
851 | * Returns number of bytes written or error code, as appropriate | |
852 | */ | |
853 | static ssize_t smk_write_nltype(struct file *file, const char __user *buf, | |
854 | size_t count, loff_t *ppos) | |
855 | { | |
856 | char bound[40]; | |
857 | char *cp; | |
858 | int i; | |
859 | ||
860 | if (!capable(CAP_MAC_ADMIN)) | |
861 | return -EPERM; | |
862 | ||
863 | if (count >= 40) | |
864 | return -EINVAL; | |
865 | ||
866 | if (copy_from_user(bound, buf, count) != 0) | |
867 | return -EFAULT; | |
868 | ||
869 | bound[count] = '\0'; | |
870 | cp = strchr(bound, ' '); | |
871 | if (cp != NULL) | |
872 | *cp = '\0'; | |
873 | cp = strchr(bound, '\n'); | |
874 | if (cp != NULL) | |
875 | *cp = '\0'; | |
876 | ||
877 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) | |
878 | if (strcmp(bound, netlbl_choices[i].o_name) == 0 || | |
879 | strcmp(bound, netlbl_choices[i].o_alias) == 0) { | |
880 | smack_net_nltype = netlbl_choices[i].o_number; | |
881 | return count; | |
882 | } | |
883 | /* | |
884 | * Not a valid choice. | |
885 | */ | |
886 | return -EINVAL; | |
887 | } | |
888 | ||
889 | static const struct file_operations smk_nltype_ops = { | |
890 | .read = smk_read_nltype, | |
891 | .write = smk_write_nltype, | |
892 | }; | |
893 | ||
894 | /** | |
895 | * smk_fill_super - fill the /smackfs superblock | |
896 | * @sb: the empty superblock | |
897 | * @data: unused | |
898 | * @silent: unused | |
899 | * | |
900 | * Fill in the well known entries for /smack | |
901 | * | |
902 | * Returns 0 on success, an error code on failure | |
903 | */ | |
904 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
905 | { | |
906 | int rc; | |
907 | struct inode *root_inode; | |
908 | ||
909 | static struct tree_descr smack_files[] = { | |
910 | [SMK_LOAD] = | |
911 | {"load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
912 | [SMK_CIPSO] = | |
913 | {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
914 | [SMK_DOI] = | |
915 | {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
916 | [SMK_DIRECT] = | |
917 | {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
918 | [SMK_AMBIENT] = | |
919 | {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
920 | [SMK_NLTYPE] = | |
921 | {"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR}, | |
922 | /* last one */ {""} | |
923 | }; | |
924 | ||
925 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
926 | if (rc != 0) { | |
927 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
928 | __func__, rc); | |
929 | return rc; | |
930 | } | |
931 | ||
932 | root_inode = sb->s_root->d_inode; | |
933 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); | |
934 | ||
935 | return 0; | |
936 | } | |
937 | ||
938 | /** | |
939 | * smk_get_sb - get the smackfs superblock | |
940 | * @fs_type: passed along without comment | |
941 | * @flags: passed along without comment | |
942 | * @dev_name: passed along without comment | |
943 | * @data: passed along without comment | |
944 | * @mnt: passed along without comment | |
945 | * | |
946 | * Just passes everything along. | |
947 | * | |
948 | * Returns what the lower level code does. | |
949 | */ | |
950 | static int smk_get_sb(struct file_system_type *fs_type, | |
951 | int flags, const char *dev_name, void *data, | |
952 | struct vfsmount *mnt) | |
953 | { | |
954 | return get_sb_single(fs_type, flags, data, smk_fill_super, mnt); | |
955 | } | |
956 | ||
957 | static struct file_system_type smk_fs_type = { | |
958 | .name = "smackfs", | |
959 | .get_sb = smk_get_sb, | |
960 | .kill_sb = kill_litter_super, | |
961 | }; | |
962 | ||
963 | static struct vfsmount *smackfs_mount; | |
964 | ||
965 | /** | |
966 | * init_smk_fs - get the smackfs superblock | |
967 | * | |
968 | * register the smackfs | |
969 | * | |
076c54c5 AD |
970 | * Do not register smackfs if Smack wasn't enabled |
971 | * on boot. We can not put this method normally under the | |
972 | * smack_init() code path since the security subsystem get | |
973 | * initialized before the vfs caches. | |
974 | * | |
975 | * Returns true if we were not chosen on boot or if | |
976 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
977 | */ |
978 | static int __init init_smk_fs(void) | |
979 | { | |
980 | int err; | |
981 | ||
076c54c5 AD |
982 | if (!security_module_enable(&smack_ops)) |
983 | return 0; | |
984 | ||
e114e473 CS |
985 | err = register_filesystem(&smk_fs_type); |
986 | if (!err) { | |
987 | smackfs_mount = kern_mount(&smk_fs_type); | |
988 | if (IS_ERR(smackfs_mount)) { | |
989 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
990 | err = PTR_ERR(smackfs_mount); | |
991 | smackfs_mount = NULL; | |
992 | } | |
993 | } | |
994 | ||
e114e473 | 995 | smk_cipso_doi(); |
4bc87e62 | 996 | smk_unlbl_ambient(NULL); |
e114e473 CS |
997 | |
998 | return err; | |
999 | } | |
1000 | ||
1001 | __initcall(init_smk_fs); |