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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 | ||
76 | /* | |
77 | * Disable concurrent writing open() operations | |
78 | */ | |
79 | static struct semaphore smack_write_sem; | |
80 | ||
81 | /* | |
82 | * Values for parsing cipso rules | |
83 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
84 | * SMK_CIPSOMEN: Minimum possible cipso rule length. | |
85 | */ | |
86 | #define SMK_DIGITLEN 4 | |
87 | #define SMK_CIPSOMIN (SMK_MAXLEN + 2 * SMK_DIGITLEN) | |
88 | ||
89 | /* | |
90 | * Seq_file read operations for /smack/load | |
91 | */ | |
92 | ||
93 | static void *load_seq_start(struct seq_file *s, loff_t *pos) | |
94 | { | |
95 | if (*pos == SEQ_READ_FINISHED) | |
96 | return NULL; | |
97 | ||
98 | return smack_list; | |
99 | } | |
100 | ||
101 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
102 | { | |
103 | struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next; | |
104 | ||
105 | if (skp == NULL) | |
106 | *pos = SEQ_READ_FINISHED; | |
107 | ||
108 | return skp; | |
109 | } | |
110 | ||
111 | static int load_seq_show(struct seq_file *s, void *v) | |
112 | { | |
113 | struct smk_list_entry *slp = (struct smk_list_entry *) v; | |
114 | struct smack_rule *srp = &slp->smk_rule; | |
115 | ||
116 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
117 | (char *)srp->smk_object); | |
118 | ||
119 | seq_putc(s, ' '); | |
120 | ||
121 | if (srp->smk_access & MAY_READ) | |
122 | seq_putc(s, 'r'); | |
123 | if (srp->smk_access & MAY_WRITE) | |
124 | seq_putc(s, 'w'); | |
125 | if (srp->smk_access & MAY_EXEC) | |
126 | seq_putc(s, 'x'); | |
127 | if (srp->smk_access & MAY_APPEND) | |
128 | seq_putc(s, 'a'); | |
129 | if (srp->smk_access == 0) | |
130 | seq_putc(s, '-'); | |
131 | ||
132 | seq_putc(s, '\n'); | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static void load_seq_stop(struct seq_file *s, void *v) | |
138 | { | |
139 | /* No-op */ | |
140 | } | |
141 | ||
142 | static struct seq_operations load_seq_ops = { | |
143 | .start = load_seq_start, | |
144 | .next = load_seq_next, | |
145 | .show = load_seq_show, | |
146 | .stop = load_seq_stop, | |
147 | }; | |
148 | ||
149 | /** | |
150 | * smk_open_load - open() for /smack/load | |
151 | * @inode: inode structure representing file | |
152 | * @file: "load" file pointer | |
153 | * | |
154 | * For reading, use load_seq_* seq_file reading operations. | |
155 | */ | |
156 | static int smk_open_load(struct inode *inode, struct file *file) | |
157 | { | |
158 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) | |
159 | return seq_open(file, &load_seq_ops); | |
160 | ||
161 | if (down_interruptible(&smack_write_sem)) | |
162 | return -ERESTARTSYS; | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | /** | |
168 | * smk_release_load - release() for /smack/load | |
169 | * @inode: inode structure representing file | |
170 | * @file: "load" file pointer | |
171 | * | |
172 | * For a reading session, use the seq_file release | |
173 | * implementation. | |
174 | * Otherwise, we are at the end of a writing session so | |
175 | * clean everything up. | |
176 | */ | |
177 | static int smk_release_load(struct inode *inode, struct file *file) | |
178 | { | |
179 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) | |
180 | return seq_release(inode, file); | |
181 | ||
182 | up(&smack_write_sem); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | /** | |
187 | * smk_set_access - add a rule to the rule list | |
188 | * @srp: the new rule to add | |
189 | * | |
190 | * Looks through the current subject/object/access list for | |
191 | * the subject/object pair and replaces the access that was | |
192 | * there. If the pair isn't found add it with the specified | |
193 | * access. | |
194 | */ | |
195 | static void smk_set_access(struct smack_rule *srp) | |
196 | { | |
197 | struct smk_list_entry *sp; | |
198 | struct smk_list_entry *newp; | |
199 | ||
200 | mutex_lock(&smack_list_lock); | |
201 | ||
202 | for (sp = smack_list; sp != NULL; sp = sp->smk_next) | |
203 | if (sp->smk_rule.smk_subject == srp->smk_subject && | |
204 | sp->smk_rule.smk_object == srp->smk_object) { | |
205 | sp->smk_rule.smk_access = srp->smk_access; | |
206 | break; | |
207 | } | |
208 | ||
209 | if (sp == NULL) { | |
210 | newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL); | |
211 | newp->smk_rule = *srp; | |
212 | newp->smk_next = smack_list; | |
213 | smack_list = newp; | |
214 | } | |
215 | ||
216 | mutex_unlock(&smack_list_lock); | |
217 | ||
218 | return; | |
219 | } | |
220 | ||
221 | /** | |
222 | * smk_write_load - write() for /smack/load | |
223 | * @filp: file pointer, not actually used | |
224 | * @buf: where to get the data from | |
225 | * @count: bytes sent | |
226 | * @ppos: where to start - must be 0 | |
227 | * | |
228 | * Get one smack access rule from above. | |
229 | * The format is exactly: | |
230 | * char subject[SMK_LABELLEN] | |
231 | * char object[SMK_LABELLEN] | |
232 | * char access[SMK_ACCESSKINDS] | |
233 | * | |
234 | * Anything following is commentary and ignored. | |
235 | * | |
236 | * writes must be SMK_LABELLEN+SMK_LABELLEN+4 bytes. | |
237 | */ | |
238 | #define MINIMUM_LOAD (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSKINDS) | |
239 | ||
240 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
241 | size_t count, loff_t *ppos) | |
242 | { | |
243 | struct smack_rule rule; | |
244 | char *data; | |
245 | int rc = -EINVAL; | |
246 | ||
247 | /* | |
248 | * Must have privilege. | |
249 | * No partial writes. | |
250 | * Enough data must be present. | |
251 | */ | |
252 | if (!capable(CAP_MAC_ADMIN)) | |
253 | return -EPERM; | |
254 | if (*ppos != 0) | |
255 | return -EINVAL; | |
256 | if (count < MINIMUM_LOAD) | |
257 | return -EINVAL; | |
258 | ||
259 | data = kzalloc(count, GFP_KERNEL); | |
260 | if (data == NULL) | |
261 | return -ENOMEM; | |
262 | ||
263 | if (copy_from_user(data, buf, count) != 0) { | |
264 | rc = -EFAULT; | |
265 | goto out; | |
266 | } | |
267 | ||
268 | rule.smk_subject = smk_import(data, 0); | |
269 | if (rule.smk_subject == NULL) | |
270 | goto out; | |
271 | ||
272 | rule.smk_object = smk_import(data + SMK_LABELLEN, 0); | |
273 | if (rule.smk_object == NULL) | |
274 | goto out; | |
275 | ||
276 | rule.smk_access = 0; | |
277 | ||
278 | switch (data[SMK_LABELLEN + SMK_LABELLEN]) { | |
279 | case '-': | |
280 | break; | |
281 | case 'r': | |
282 | case 'R': | |
283 | rule.smk_access |= MAY_READ; | |
284 | break; | |
285 | default: | |
286 | goto out; | |
287 | } | |
288 | ||
289 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { | |
290 | case '-': | |
291 | break; | |
292 | case 'w': | |
293 | case 'W': | |
294 | rule.smk_access |= MAY_WRITE; | |
295 | break; | |
296 | default: | |
297 | goto out; | |
298 | } | |
299 | ||
300 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { | |
301 | case '-': | |
302 | break; | |
303 | case 'x': | |
304 | case 'X': | |
305 | rule.smk_access |= MAY_EXEC; | |
306 | break; | |
307 | default: | |
308 | goto out; | |
309 | } | |
310 | ||
311 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { | |
312 | case '-': | |
313 | break; | |
314 | case 'a': | |
315 | case 'A': | |
316 | rule.smk_access |= MAY_READ; | |
317 | break; | |
318 | default: | |
319 | goto out; | |
320 | } | |
321 | ||
322 | smk_set_access(&rule); | |
323 | rc = count; | |
324 | ||
325 | out: | |
326 | kfree(data); | |
327 | return rc; | |
328 | } | |
329 | ||
330 | static const struct file_operations smk_load_ops = { | |
331 | .open = smk_open_load, | |
332 | .read = seq_read, | |
333 | .llseek = seq_lseek, | |
334 | .write = smk_write_load, | |
335 | .release = smk_release_load, | |
336 | }; | |
337 | ||
338 | /** | |
339 | * smk_cipso_doi - initialize the CIPSO domain | |
340 | */ | |
341 | void smk_cipso_doi(void) | |
342 | { | |
343 | int rc; | |
344 | struct cipso_v4_doi *doip; | |
345 | struct netlbl_audit audit_info; | |
346 | ||
4bc87e62 CS |
347 | audit_info.loginuid = audit_get_loginuid(current); |
348 | audit_info.secid = smack_to_secid(current->security); | |
349 | ||
e114e473 CS |
350 | rc = netlbl_cfg_map_del(NULL, &audit_info); |
351 | if (rc != 0) | |
352 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
353 | __func__, __LINE__, rc); | |
354 | ||
355 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
356 | if (doip == NULL) | |
357 | panic("smack: Failed to initialize cipso DOI.\n"); | |
358 | doip->map.std = NULL; | |
359 | doip->doi = smk_cipso_doi_value; | |
360 | doip->type = CIPSO_V4_MAP_PASS; | |
361 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
362 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
363 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
364 | ||
365 | rc = netlbl_cfg_cipsov4_add_map(doip, NULL, &audit_info); | |
366 | if (rc != 0) | |
367 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
368 | __func__, __LINE__, rc); | |
369 | } | |
370 | ||
4bc87e62 CS |
371 | /** |
372 | * smk_unlbl_ambient - initialize the unlabeled domain | |
373 | */ | |
374 | void smk_unlbl_ambient(char *oldambient) | |
375 | { | |
376 | int rc; | |
377 | struct netlbl_audit audit_info; | |
378 | ||
379 | audit_info.loginuid = audit_get_loginuid(current); | |
380 | audit_info.secid = smack_to_secid(current->security); | |
381 | ||
382 | if (oldambient != NULL) { | |
383 | rc = netlbl_cfg_map_del(oldambient, &audit_info); | |
384 | if (rc != 0) | |
385 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
386 | __func__, __LINE__, rc); | |
387 | } | |
388 | ||
389 | rc = netlbl_cfg_unlbl_add_map(smack_net_ambient, &audit_info); | |
390 | if (rc != 0) | |
391 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
392 | __func__, __LINE__, rc); | |
393 | } | |
394 | ||
e114e473 CS |
395 | /* |
396 | * Seq_file read operations for /smack/cipso | |
397 | */ | |
398 | ||
399 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
400 | { | |
401 | if (*pos == SEQ_READ_FINISHED) | |
402 | return NULL; | |
403 | ||
404 | return smack_known; | |
405 | } | |
406 | ||
407 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
408 | { | |
409 | struct smack_known *skp = ((struct smack_known *) v)->smk_next; | |
410 | ||
411 | /* | |
412 | * Omit labels with no associated cipso value | |
413 | */ | |
414 | while (skp != NULL && !skp->smk_cipso) | |
415 | skp = skp->smk_next; | |
416 | ||
417 | if (skp == NULL) | |
418 | *pos = SEQ_READ_FINISHED; | |
419 | ||
420 | return skp; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Print cipso labels in format: | |
425 | * label level[/cat[,cat]] | |
426 | */ | |
427 | static int cipso_seq_show(struct seq_file *s, void *v) | |
428 | { | |
429 | struct smack_known *skp = (struct smack_known *) v; | |
430 | struct smack_cipso *scp = skp->smk_cipso; | |
431 | char *cbp; | |
432 | char sep = '/'; | |
433 | int cat = 1; | |
434 | int i; | |
435 | unsigned char m; | |
436 | ||
437 | if (scp == NULL) | |
438 | return 0; | |
439 | ||
440 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); | |
441 | ||
442 | cbp = scp->smk_catset; | |
443 | for (i = 0; i < SMK_LABELLEN; i++) | |
444 | for (m = 0x80; m != 0; m >>= 1) { | |
445 | if (m & cbp[i]) { | |
446 | seq_printf(s, "%c%d", sep, cat); | |
447 | sep = ','; | |
448 | } | |
449 | cat++; | |
450 | } | |
451 | ||
452 | seq_putc(s, '\n'); | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | static void cipso_seq_stop(struct seq_file *s, void *v) | |
458 | { | |
459 | /* No-op */ | |
460 | } | |
461 | ||
462 | static struct seq_operations cipso_seq_ops = { | |
463 | .start = cipso_seq_start, | |
464 | .stop = cipso_seq_stop, | |
465 | .next = cipso_seq_next, | |
466 | .show = cipso_seq_show, | |
467 | }; | |
468 | ||
469 | /** | |
470 | * smk_open_cipso - open() for /smack/cipso | |
471 | * @inode: inode structure representing file | |
472 | * @file: "cipso" file pointer | |
473 | * | |
474 | * Connect our cipso_seq_* operations with /smack/cipso | |
475 | * file_operations | |
476 | */ | |
477 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
478 | { | |
479 | return seq_open(file, &cipso_seq_ops); | |
480 | } | |
481 | ||
482 | /** | |
483 | * smk_write_cipso - write() for /smack/cipso | |
484 | * @filp: file pointer, not actually used | |
485 | * @buf: where to get the data from | |
486 | * @count: bytes sent | |
487 | * @ppos: where to start | |
488 | * | |
489 | * Accepts only one cipso rule per write call. | |
490 | * Returns number of bytes written or error code, as appropriate | |
491 | */ | |
492 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
493 | size_t count, loff_t *ppos) | |
494 | { | |
495 | struct smack_known *skp; | |
496 | struct smack_cipso *scp = NULL; | |
497 | char mapcatset[SMK_LABELLEN]; | |
498 | int maplevel; | |
499 | int cat; | |
500 | int catlen; | |
501 | ssize_t rc = -EINVAL; | |
502 | char *data = NULL; | |
503 | char *rule; | |
504 | int ret; | |
505 | int i; | |
506 | ||
507 | /* | |
508 | * Must have privilege. | |
509 | * No partial writes. | |
510 | * Enough data must be present. | |
511 | */ | |
512 | if (!capable(CAP_MAC_ADMIN)) | |
513 | return -EPERM; | |
514 | if (*ppos != 0) | |
515 | return -EINVAL; | |
516 | if (count <= SMK_CIPSOMIN) | |
517 | return -EINVAL; | |
518 | ||
519 | data = kzalloc(count + 1, GFP_KERNEL); | |
520 | if (data == NULL) | |
521 | return -ENOMEM; | |
522 | ||
523 | if (copy_from_user(data, buf, count) != 0) { | |
524 | rc = -EFAULT; | |
525 | goto unlockedout; | |
526 | } | |
527 | ||
528 | data[count] = '\0'; | |
529 | rule = data; | |
530 | /* | |
531 | * Only allow one writer at a time. Writes should be | |
532 | * quite rare and small in any case. | |
533 | */ | |
534 | mutex_lock(&smack_cipso_lock); | |
535 | ||
536 | skp = smk_import_entry(rule, 0); | |
537 | if (skp == NULL) | |
538 | goto out; | |
539 | ||
540 | rule += SMK_LABELLEN;; | |
541 | ret = sscanf(rule, "%d", &maplevel); | |
542 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
543 | goto out; | |
544 | ||
545 | rule += SMK_DIGITLEN; | |
546 | ret = sscanf(rule, "%d", &catlen); | |
547 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
548 | goto out; | |
549 | ||
550 | if (count <= (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) | |
551 | goto out; | |
552 | ||
553 | memset(mapcatset, 0, sizeof(mapcatset)); | |
554 | ||
555 | for (i = 0; i < catlen; i++) { | |
556 | rule += SMK_DIGITLEN; | |
557 | ret = sscanf(rule, "%d", &cat); | |
558 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) | |
559 | goto out; | |
560 | ||
561 | smack_catset_bit(cat, mapcatset); | |
562 | } | |
563 | ||
564 | if (skp->smk_cipso == NULL) { | |
565 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); | |
566 | if (scp == NULL) { | |
567 | rc = -ENOMEM; | |
568 | goto out; | |
569 | } | |
570 | } | |
571 | ||
572 | spin_lock_bh(&skp->smk_cipsolock); | |
573 | ||
574 | if (scp == NULL) | |
575 | scp = skp->smk_cipso; | |
576 | else | |
577 | skp->smk_cipso = scp; | |
578 | ||
579 | scp->smk_level = maplevel; | |
580 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); | |
581 | ||
582 | spin_unlock_bh(&skp->smk_cipsolock); | |
583 | ||
584 | rc = count; | |
585 | out: | |
586 | mutex_unlock(&smack_cipso_lock); | |
587 | unlockedout: | |
588 | kfree(data); | |
589 | return rc; | |
590 | } | |
591 | ||
592 | static const struct file_operations smk_cipso_ops = { | |
593 | .open = smk_open_cipso, | |
594 | .read = seq_read, | |
595 | .llseek = seq_lseek, | |
596 | .write = smk_write_cipso, | |
597 | .release = seq_release, | |
598 | }; | |
599 | ||
600 | /** | |
601 | * smk_read_doi - read() for /smack/doi | |
602 | * @filp: file pointer, not actually used | |
603 | * @buf: where to put the result | |
604 | * @count: maximum to send along | |
605 | * @ppos: where to start | |
606 | * | |
607 | * Returns number of bytes read or error code, as appropriate | |
608 | */ | |
609 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
610 | size_t count, loff_t *ppos) | |
611 | { | |
612 | char temp[80]; | |
613 | ssize_t rc; | |
614 | ||
615 | if (*ppos != 0) | |
616 | return 0; | |
617 | ||
618 | sprintf(temp, "%d", smk_cipso_doi_value); | |
619 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
620 | ||
621 | return rc; | |
622 | } | |
623 | ||
624 | /** | |
625 | * smk_write_doi - write() for /smack/doi | |
626 | * @filp: file pointer, not actually used | |
627 | * @buf: where to get the data from | |
628 | * @count: bytes sent | |
629 | * @ppos: where to start | |
630 | * | |
631 | * Returns number of bytes written or error code, as appropriate | |
632 | */ | |
633 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
634 | size_t count, loff_t *ppos) | |
635 | { | |
636 | char temp[80]; | |
637 | int i; | |
638 | ||
639 | if (!capable(CAP_MAC_ADMIN)) | |
640 | return -EPERM; | |
641 | ||
642 | if (count >= sizeof(temp) || count == 0) | |
643 | return -EINVAL; | |
644 | ||
645 | if (copy_from_user(temp, buf, count) != 0) | |
646 | return -EFAULT; | |
647 | ||
648 | temp[count] = '\0'; | |
649 | ||
650 | if (sscanf(temp, "%d", &i) != 1) | |
651 | return -EINVAL; | |
652 | ||
653 | smk_cipso_doi_value = i; | |
654 | ||
655 | smk_cipso_doi(); | |
656 | ||
657 | return count; | |
658 | } | |
659 | ||
660 | static const struct file_operations smk_doi_ops = { | |
661 | .read = smk_read_doi, | |
662 | .write = smk_write_doi, | |
663 | }; | |
664 | ||
665 | /** | |
666 | * smk_read_direct - read() for /smack/direct | |
667 | * @filp: file pointer, not actually used | |
668 | * @buf: where to put the result | |
669 | * @count: maximum to send along | |
670 | * @ppos: where to start | |
671 | * | |
672 | * Returns number of bytes read or error code, as appropriate | |
673 | */ | |
674 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
675 | size_t count, loff_t *ppos) | |
676 | { | |
677 | char temp[80]; | |
678 | ssize_t rc; | |
679 | ||
680 | if (*ppos != 0) | |
681 | return 0; | |
682 | ||
683 | sprintf(temp, "%d", smack_cipso_direct); | |
684 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
685 | ||
686 | return rc; | |
687 | } | |
688 | ||
689 | /** | |
690 | * smk_write_direct - write() for /smack/direct | |
691 | * @filp: file pointer, not actually used | |
692 | * @buf: where to get the data from | |
693 | * @count: bytes sent | |
694 | * @ppos: where to start | |
695 | * | |
696 | * Returns number of bytes written or error code, as appropriate | |
697 | */ | |
698 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
699 | size_t count, loff_t *ppos) | |
700 | { | |
701 | char temp[80]; | |
702 | int i; | |
703 | ||
704 | if (!capable(CAP_MAC_ADMIN)) | |
705 | return -EPERM; | |
706 | ||
707 | if (count >= sizeof(temp) || count == 0) | |
708 | return -EINVAL; | |
709 | ||
710 | if (copy_from_user(temp, buf, count) != 0) | |
711 | return -EFAULT; | |
712 | ||
713 | temp[count] = '\0'; | |
714 | ||
715 | if (sscanf(temp, "%d", &i) != 1) | |
716 | return -EINVAL; | |
717 | ||
718 | smack_cipso_direct = i; | |
719 | ||
720 | return count; | |
721 | } | |
722 | ||
723 | static const struct file_operations smk_direct_ops = { | |
724 | .read = smk_read_direct, | |
725 | .write = smk_write_direct, | |
726 | }; | |
727 | ||
728 | /** | |
729 | * smk_read_ambient - read() for /smack/ambient | |
730 | * @filp: file pointer, not actually used | |
731 | * @buf: where to put the result | |
732 | * @cn: maximum to send along | |
733 | * @ppos: where to start | |
734 | * | |
735 | * Returns number of bytes read or error code, as appropriate | |
736 | */ | |
737 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
738 | size_t cn, loff_t *ppos) | |
739 | { | |
740 | ssize_t rc; | |
e114e473 CS |
741 | int asize; |
742 | ||
743 | if (*ppos != 0) | |
744 | return 0; | |
745 | /* | |
746 | * Being careful to avoid a problem in the case where | |
747 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 748 | */ |
4bc87e62 | 749 | mutex_lock(&smack_ambient_lock); |
e114e473 | 750 | |
4bc87e62 CS |
751 | asize = strlen(smack_net_ambient) + 1; |
752 | ||
753 | if (cn >= asize) | |
754 | rc = simple_read_from_buffer(buf, cn, ppos, | |
755 | smack_net_ambient, asize); | |
756 | else | |
757 | rc = -EINVAL; | |
e114e473 | 758 | |
4bc87e62 | 759 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
760 | |
761 | return rc; | |
762 | } | |
763 | ||
764 | /** | |
765 | * smk_write_ambient - write() for /smack/ambient | |
766 | * @filp: file pointer, not actually used | |
767 | * @buf: where to get the data from | |
768 | * @count: bytes sent | |
769 | * @ppos: where to start | |
770 | * | |
771 | * Returns number of bytes written or error code, as appropriate | |
772 | */ | |
773 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
774 | size_t count, loff_t *ppos) | |
775 | { | |
776 | char in[SMK_LABELLEN]; | |
4bc87e62 | 777 | char *oldambient; |
e114e473 CS |
778 | char *smack; |
779 | ||
780 | if (!capable(CAP_MAC_ADMIN)) | |
781 | return -EPERM; | |
782 | ||
783 | if (count >= SMK_LABELLEN) | |
784 | return -EINVAL; | |
785 | ||
786 | if (copy_from_user(in, buf, count) != 0) | |
787 | return -EFAULT; | |
788 | ||
789 | smack = smk_import(in, count); | |
790 | if (smack == NULL) | |
791 | return -EINVAL; | |
792 | ||
4bc87e62 CS |
793 | mutex_lock(&smack_ambient_lock); |
794 | ||
795 | oldambient = smack_net_ambient; | |
e114e473 | 796 | smack_net_ambient = smack; |
4bc87e62 CS |
797 | smk_unlbl_ambient(oldambient); |
798 | ||
799 | mutex_unlock(&smack_ambient_lock); | |
e114e473 CS |
800 | |
801 | return count; | |
802 | } | |
803 | ||
804 | static const struct file_operations smk_ambient_ops = { | |
805 | .read = smk_read_ambient, | |
806 | .write = smk_write_ambient, | |
807 | }; | |
808 | ||
809 | struct option_names { | |
810 | int o_number; | |
811 | char *o_name; | |
812 | char *o_alias; | |
813 | }; | |
814 | ||
815 | static struct option_names netlbl_choices[] = { | |
816 | { NETLBL_NLTYPE_RIPSO, | |
817 | NETLBL_NLTYPE_RIPSO_NAME, "ripso" }, | |
818 | { NETLBL_NLTYPE_CIPSOV4, | |
819 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" }, | |
820 | { NETLBL_NLTYPE_CIPSOV4, | |
821 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" }, | |
822 | { NETLBL_NLTYPE_CIPSOV6, | |
823 | NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" }, | |
824 | { NETLBL_NLTYPE_UNLABELED, | |
825 | NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" }, | |
826 | }; | |
827 | ||
828 | /** | |
829 | * smk_read_nltype - read() for /smack/nltype | |
830 | * @filp: file pointer, not actually used | |
831 | * @buf: where to put the result | |
832 | * @count: maximum to send along | |
833 | * @ppos: where to start | |
834 | * | |
835 | * Returns number of bytes read or error code, as appropriate | |
836 | */ | |
837 | static ssize_t smk_read_nltype(struct file *filp, char __user *buf, | |
838 | size_t count, loff_t *ppos) | |
839 | { | |
840 | char bound[40]; | |
841 | ssize_t rc; | |
842 | int i; | |
843 | ||
844 | if (count < SMK_LABELLEN) | |
845 | return -EINVAL; | |
846 | ||
847 | if (*ppos != 0) | |
848 | return 0; | |
849 | ||
850 | sprintf(bound, "unknown"); | |
851 | ||
852 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) | |
853 | if (smack_net_nltype == netlbl_choices[i].o_number) { | |
854 | sprintf(bound, "%s", netlbl_choices[i].o_name); | |
855 | break; | |
856 | } | |
857 | ||
858 | rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound)); | |
859 | ||
860 | return rc; | |
861 | } | |
862 | ||
863 | /** | |
864 | * smk_write_nltype - write() for /smack/nltype | |
865 | * @filp: file pointer, not actually used | |
866 | * @buf: where to get the data from | |
867 | * @count: bytes sent | |
868 | * @ppos: where to start | |
869 | * | |
870 | * Returns number of bytes written or error code, as appropriate | |
871 | */ | |
872 | static ssize_t smk_write_nltype(struct file *file, const char __user *buf, | |
873 | size_t count, loff_t *ppos) | |
874 | { | |
875 | char bound[40]; | |
876 | char *cp; | |
877 | int i; | |
878 | ||
879 | if (!capable(CAP_MAC_ADMIN)) | |
880 | return -EPERM; | |
881 | ||
882 | if (count >= 40) | |
883 | return -EINVAL; | |
884 | ||
885 | if (copy_from_user(bound, buf, count) != 0) | |
886 | return -EFAULT; | |
887 | ||
888 | bound[count] = '\0'; | |
889 | cp = strchr(bound, ' '); | |
890 | if (cp != NULL) | |
891 | *cp = '\0'; | |
892 | cp = strchr(bound, '\n'); | |
893 | if (cp != NULL) | |
894 | *cp = '\0'; | |
895 | ||
896 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) | |
897 | if (strcmp(bound, netlbl_choices[i].o_name) == 0 || | |
898 | strcmp(bound, netlbl_choices[i].o_alias) == 0) { | |
899 | smack_net_nltype = netlbl_choices[i].o_number; | |
900 | return count; | |
901 | } | |
902 | /* | |
903 | * Not a valid choice. | |
904 | */ | |
905 | return -EINVAL; | |
906 | } | |
907 | ||
908 | static const struct file_operations smk_nltype_ops = { | |
909 | .read = smk_read_nltype, | |
910 | .write = smk_write_nltype, | |
911 | }; | |
912 | ||
913 | /** | |
914 | * smk_fill_super - fill the /smackfs superblock | |
915 | * @sb: the empty superblock | |
916 | * @data: unused | |
917 | * @silent: unused | |
918 | * | |
919 | * Fill in the well known entries for /smack | |
920 | * | |
921 | * Returns 0 on success, an error code on failure | |
922 | */ | |
923 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
924 | { | |
925 | int rc; | |
926 | struct inode *root_inode; | |
927 | ||
928 | static struct tree_descr smack_files[] = { | |
929 | [SMK_LOAD] = | |
930 | {"load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
931 | [SMK_CIPSO] = | |
932 | {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
933 | [SMK_DOI] = | |
934 | {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
935 | [SMK_DIRECT] = | |
936 | {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
937 | [SMK_AMBIENT] = | |
938 | {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
939 | [SMK_NLTYPE] = | |
940 | {"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR}, | |
941 | /* last one */ {""} | |
942 | }; | |
943 | ||
944 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
945 | if (rc != 0) { | |
946 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
947 | __func__, rc); | |
948 | return rc; | |
949 | } | |
950 | ||
951 | root_inode = sb->s_root->d_inode; | |
952 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); | |
953 | ||
954 | return 0; | |
955 | } | |
956 | ||
957 | /** | |
958 | * smk_get_sb - get the smackfs superblock | |
959 | * @fs_type: passed along without comment | |
960 | * @flags: passed along without comment | |
961 | * @dev_name: passed along without comment | |
962 | * @data: passed along without comment | |
963 | * @mnt: passed along without comment | |
964 | * | |
965 | * Just passes everything along. | |
966 | * | |
967 | * Returns what the lower level code does. | |
968 | */ | |
969 | static int smk_get_sb(struct file_system_type *fs_type, | |
970 | int flags, const char *dev_name, void *data, | |
971 | struct vfsmount *mnt) | |
972 | { | |
973 | return get_sb_single(fs_type, flags, data, smk_fill_super, mnt); | |
974 | } | |
975 | ||
976 | static struct file_system_type smk_fs_type = { | |
977 | .name = "smackfs", | |
978 | .get_sb = smk_get_sb, | |
979 | .kill_sb = kill_litter_super, | |
980 | }; | |
981 | ||
982 | static struct vfsmount *smackfs_mount; | |
983 | ||
984 | /** | |
985 | * init_smk_fs - get the smackfs superblock | |
986 | * | |
987 | * register the smackfs | |
988 | * | |
989 | * Returns 0 unless the registration fails. | |
990 | */ | |
991 | static int __init init_smk_fs(void) | |
992 | { | |
993 | int err; | |
994 | ||
995 | err = register_filesystem(&smk_fs_type); | |
996 | if (!err) { | |
997 | smackfs_mount = kern_mount(&smk_fs_type); | |
998 | if (IS_ERR(smackfs_mount)) { | |
999 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
1000 | err = PTR_ERR(smackfs_mount); | |
1001 | smackfs_mount = NULL; | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | sema_init(&smack_write_sem, 1); | |
1006 | smk_cipso_doi(); | |
4bc87e62 | 1007 | smk_unlbl_ambient(NULL); |
e114e473 CS |
1008 | |
1009 | return err; | |
1010 | } | |
1011 | ||
1012 | __initcall(init_smk_fs); |