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