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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. | |
b500ce8d AD |
84 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
85 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
86 | */ |
87 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
88 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
89 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
90 | ||
91 | /* | |
92 | * Values for parsing MAC rules | |
93 | * SMK_ACCESS: Maximum possible combination of access permissions | |
94 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
95 | * SMK_LOADLEN: Smack rule length | |
96 | */ | |
97 | #define SMK_ACCESS "rwxa" | |
98 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
99 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
100 | ||
e114e473 CS |
101 | |
102 | /* | |
103 | * Seq_file read operations for /smack/load | |
104 | */ | |
105 | ||
106 | static void *load_seq_start(struct seq_file *s, loff_t *pos) | |
107 | { | |
108 | if (*pos == SEQ_READ_FINISHED) | |
109 | return NULL; | |
110 | ||
111 | return smack_list; | |
112 | } | |
113 | ||
114 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
115 | { | |
116 | struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next; | |
117 | ||
118 | if (skp == NULL) | |
119 | *pos = SEQ_READ_FINISHED; | |
120 | ||
121 | return skp; | |
122 | } | |
123 | ||
124 | static int load_seq_show(struct seq_file *s, void *v) | |
125 | { | |
126 | struct smk_list_entry *slp = (struct smk_list_entry *) v; | |
127 | struct smack_rule *srp = &slp->smk_rule; | |
128 | ||
129 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
130 | (char *)srp->smk_object); | |
131 | ||
132 | seq_putc(s, ' '); | |
133 | ||
134 | if (srp->smk_access & MAY_READ) | |
135 | seq_putc(s, 'r'); | |
136 | if (srp->smk_access & MAY_WRITE) | |
137 | seq_putc(s, 'w'); | |
138 | if (srp->smk_access & MAY_EXEC) | |
139 | seq_putc(s, 'x'); | |
140 | if (srp->smk_access & MAY_APPEND) | |
141 | seq_putc(s, 'a'); | |
142 | if (srp->smk_access == 0) | |
143 | seq_putc(s, '-'); | |
144 | ||
145 | seq_putc(s, '\n'); | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | static void load_seq_stop(struct seq_file *s, void *v) | |
151 | { | |
152 | /* No-op */ | |
153 | } | |
154 | ||
155 | static struct seq_operations load_seq_ops = { | |
156 | .start = load_seq_start, | |
157 | .next = load_seq_next, | |
158 | .show = load_seq_show, | |
159 | .stop = load_seq_stop, | |
160 | }; | |
161 | ||
162 | /** | |
163 | * smk_open_load - open() for /smack/load | |
164 | * @inode: inode structure representing file | |
165 | * @file: "load" file pointer | |
166 | * | |
167 | * For reading, use load_seq_* seq_file reading operations. | |
168 | */ | |
169 | static int smk_open_load(struct inode *inode, struct file *file) | |
170 | { | |
171 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) | |
172 | return seq_open(file, &load_seq_ops); | |
173 | ||
174 | if (down_interruptible(&smack_write_sem)) | |
175 | return -ERESTARTSYS; | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | /** | |
181 | * smk_release_load - release() for /smack/load | |
182 | * @inode: inode structure representing file | |
183 | * @file: "load" file pointer | |
184 | * | |
185 | * For a reading session, use the seq_file release | |
186 | * implementation. | |
187 | * Otherwise, we are at the end of a writing session so | |
188 | * clean everything up. | |
189 | */ | |
190 | static int smk_release_load(struct inode *inode, struct file *file) | |
191 | { | |
192 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) | |
193 | return seq_release(inode, file); | |
194 | ||
195 | up(&smack_write_sem); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | /** | |
200 | * smk_set_access - add a rule to the rule list | |
201 | * @srp: the new rule to add | |
202 | * | |
203 | * Looks through the current subject/object/access list for | |
204 | * the subject/object pair and replaces the access that was | |
205 | * there. If the pair isn't found add it with the specified | |
206 | * access. | |
207 | */ | |
208 | static void smk_set_access(struct smack_rule *srp) | |
209 | { | |
210 | struct smk_list_entry *sp; | |
211 | struct smk_list_entry *newp; | |
212 | ||
213 | mutex_lock(&smack_list_lock); | |
214 | ||
215 | for (sp = smack_list; sp != NULL; sp = sp->smk_next) | |
216 | if (sp->smk_rule.smk_subject == srp->smk_subject && | |
217 | sp->smk_rule.smk_object == srp->smk_object) { | |
218 | sp->smk_rule.smk_access = srp->smk_access; | |
219 | break; | |
220 | } | |
221 | ||
222 | if (sp == NULL) { | |
223 | newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL); | |
224 | newp->smk_rule = *srp; | |
225 | newp->smk_next = smack_list; | |
226 | smack_list = newp; | |
227 | } | |
228 | ||
229 | mutex_unlock(&smack_list_lock); | |
230 | ||
231 | return; | |
232 | } | |
233 | ||
234 | /** | |
235 | * smk_write_load - write() for /smack/load | |
236 | * @filp: file pointer, not actually used | |
237 | * @buf: where to get the data from | |
238 | * @count: bytes sent | |
239 | * @ppos: where to start - must be 0 | |
240 | * | |
241 | * Get one smack access rule from above. | |
242 | * The format is exactly: | |
243 | * char subject[SMK_LABELLEN] | |
244 | * char object[SMK_LABELLEN] | |
b500ce8d | 245 | * char access[SMK_ACCESSLEN] |
e114e473 | 246 | * |
b500ce8d | 247 | * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. |
e114e473 | 248 | */ |
e114e473 CS |
249 | static ssize_t smk_write_load(struct file *file, const char __user *buf, |
250 | size_t count, loff_t *ppos) | |
251 | { | |
252 | struct smack_rule rule; | |
253 | char *data; | |
254 | int rc = -EINVAL; | |
255 | ||
256 | /* | |
257 | * Must have privilege. | |
258 | * No partial writes. | |
259 | * Enough data must be present. | |
260 | */ | |
261 | if (!capable(CAP_MAC_ADMIN)) | |
262 | return -EPERM; | |
263 | if (*ppos != 0) | |
264 | return -EINVAL; | |
b500ce8d | 265 | if (count != SMK_LOADLEN) |
e114e473 CS |
266 | return -EINVAL; |
267 | ||
268 | data = kzalloc(count, GFP_KERNEL); | |
269 | if (data == NULL) | |
270 | return -ENOMEM; | |
271 | ||
272 | if (copy_from_user(data, buf, count) != 0) { | |
273 | rc = -EFAULT; | |
274 | goto out; | |
275 | } | |
276 | ||
277 | rule.smk_subject = smk_import(data, 0); | |
278 | if (rule.smk_subject == NULL) | |
279 | goto out; | |
280 | ||
281 | rule.smk_object = smk_import(data + SMK_LABELLEN, 0); | |
282 | if (rule.smk_object == NULL) | |
283 | goto out; | |
284 | ||
285 | rule.smk_access = 0; | |
286 | ||
287 | switch (data[SMK_LABELLEN + SMK_LABELLEN]) { | |
288 | case '-': | |
289 | break; | |
290 | case 'r': | |
291 | case 'R': | |
292 | rule.smk_access |= MAY_READ; | |
293 | break; | |
294 | default: | |
295 | goto out; | |
296 | } | |
297 | ||
298 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { | |
299 | case '-': | |
300 | break; | |
301 | case 'w': | |
302 | case 'W': | |
303 | rule.smk_access |= MAY_WRITE; | |
304 | break; | |
305 | default: | |
306 | goto out; | |
307 | } | |
308 | ||
309 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { | |
310 | case '-': | |
311 | break; | |
312 | case 'x': | |
313 | case 'X': | |
314 | rule.smk_access |= MAY_EXEC; | |
315 | break; | |
316 | default: | |
317 | goto out; | |
318 | } | |
319 | ||
320 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { | |
321 | case '-': | |
322 | break; | |
323 | case 'a': | |
324 | case 'A': | |
325 | rule.smk_access |= MAY_READ; | |
326 | break; | |
327 | default: | |
328 | goto out; | |
329 | } | |
330 | ||
331 | smk_set_access(&rule); | |
332 | rc = count; | |
333 | ||
334 | out: | |
335 | kfree(data); | |
336 | return rc; | |
337 | } | |
338 | ||
339 | static const struct file_operations smk_load_ops = { | |
340 | .open = smk_open_load, | |
341 | .read = seq_read, | |
342 | .llseek = seq_lseek, | |
343 | .write = smk_write_load, | |
344 | .release = smk_release_load, | |
345 | }; | |
346 | ||
347 | /** | |
348 | * smk_cipso_doi - initialize the CIPSO domain | |
349 | */ | |
350 | void smk_cipso_doi(void) | |
351 | { | |
352 | int rc; | |
353 | struct cipso_v4_doi *doip; | |
354 | struct netlbl_audit audit_info; | |
355 | ||
4bc87e62 CS |
356 | audit_info.loginuid = audit_get_loginuid(current); |
357 | audit_info.secid = smack_to_secid(current->security); | |
358 | ||
e114e473 CS |
359 | rc = netlbl_cfg_map_del(NULL, &audit_info); |
360 | if (rc != 0) | |
361 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
362 | __func__, __LINE__, rc); | |
363 | ||
364 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
365 | if (doip == NULL) | |
366 | panic("smack: Failed to initialize cipso DOI.\n"); | |
367 | doip->map.std = NULL; | |
368 | doip->doi = smk_cipso_doi_value; | |
369 | doip->type = CIPSO_V4_MAP_PASS; | |
370 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
371 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
372 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
373 | ||
374 | rc = netlbl_cfg_cipsov4_add_map(doip, NULL, &audit_info); | |
375 | if (rc != 0) | |
376 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
377 | __func__, __LINE__, rc); | |
378 | } | |
379 | ||
4bc87e62 CS |
380 | /** |
381 | * smk_unlbl_ambient - initialize the unlabeled domain | |
382 | */ | |
383 | void smk_unlbl_ambient(char *oldambient) | |
384 | { | |
385 | int rc; | |
386 | struct netlbl_audit audit_info; | |
387 | ||
388 | audit_info.loginuid = audit_get_loginuid(current); | |
389 | audit_info.secid = smack_to_secid(current->security); | |
390 | ||
391 | if (oldambient != NULL) { | |
392 | rc = netlbl_cfg_map_del(oldambient, &audit_info); | |
393 | if (rc != 0) | |
394 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
395 | __func__, __LINE__, rc); | |
396 | } | |
397 | ||
398 | rc = netlbl_cfg_unlbl_add_map(smack_net_ambient, &audit_info); | |
399 | if (rc != 0) | |
400 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
401 | __func__, __LINE__, rc); | |
402 | } | |
403 | ||
e114e473 CS |
404 | /* |
405 | * Seq_file read operations for /smack/cipso | |
406 | */ | |
407 | ||
408 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
409 | { | |
410 | if (*pos == SEQ_READ_FINISHED) | |
411 | return NULL; | |
412 | ||
413 | return smack_known; | |
414 | } | |
415 | ||
416 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
417 | { | |
418 | struct smack_known *skp = ((struct smack_known *) v)->smk_next; | |
419 | ||
420 | /* | |
421 | * Omit labels with no associated cipso value | |
422 | */ | |
423 | while (skp != NULL && !skp->smk_cipso) | |
424 | skp = skp->smk_next; | |
425 | ||
426 | if (skp == NULL) | |
427 | *pos = SEQ_READ_FINISHED; | |
428 | ||
429 | return skp; | |
430 | } | |
431 | ||
432 | /* | |
433 | * Print cipso labels in format: | |
434 | * label level[/cat[,cat]] | |
435 | */ | |
436 | static int cipso_seq_show(struct seq_file *s, void *v) | |
437 | { | |
438 | struct smack_known *skp = (struct smack_known *) v; | |
439 | struct smack_cipso *scp = skp->smk_cipso; | |
440 | char *cbp; | |
441 | char sep = '/'; | |
442 | int cat = 1; | |
443 | int i; | |
444 | unsigned char m; | |
445 | ||
446 | if (scp == NULL) | |
447 | return 0; | |
448 | ||
449 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); | |
450 | ||
451 | cbp = scp->smk_catset; | |
452 | for (i = 0; i < SMK_LABELLEN; i++) | |
453 | for (m = 0x80; m != 0; m >>= 1) { | |
454 | if (m & cbp[i]) { | |
455 | seq_printf(s, "%c%d", sep, cat); | |
456 | sep = ','; | |
457 | } | |
458 | cat++; | |
459 | } | |
460 | ||
461 | seq_putc(s, '\n'); | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | static void cipso_seq_stop(struct seq_file *s, void *v) | |
467 | { | |
468 | /* No-op */ | |
469 | } | |
470 | ||
471 | static struct seq_operations cipso_seq_ops = { | |
472 | .start = cipso_seq_start, | |
473 | .stop = cipso_seq_stop, | |
474 | .next = cipso_seq_next, | |
475 | .show = cipso_seq_show, | |
476 | }; | |
477 | ||
478 | /** | |
479 | * smk_open_cipso - open() for /smack/cipso | |
480 | * @inode: inode structure representing file | |
481 | * @file: "cipso" file pointer | |
482 | * | |
483 | * Connect our cipso_seq_* operations with /smack/cipso | |
484 | * file_operations | |
485 | */ | |
486 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
487 | { | |
488 | return seq_open(file, &cipso_seq_ops); | |
489 | } | |
490 | ||
491 | /** | |
492 | * smk_write_cipso - write() for /smack/cipso | |
493 | * @filp: file pointer, not actually used | |
494 | * @buf: where to get the data from | |
495 | * @count: bytes sent | |
496 | * @ppos: where to start | |
497 | * | |
498 | * Accepts only one cipso rule per write call. | |
499 | * Returns number of bytes written or error code, as appropriate | |
500 | */ | |
501 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
502 | size_t count, loff_t *ppos) | |
503 | { | |
504 | struct smack_known *skp; | |
505 | struct smack_cipso *scp = NULL; | |
506 | char mapcatset[SMK_LABELLEN]; | |
507 | int maplevel; | |
508 | int cat; | |
509 | int catlen; | |
510 | ssize_t rc = -EINVAL; | |
511 | char *data = NULL; | |
512 | char *rule; | |
513 | int ret; | |
514 | int i; | |
515 | ||
516 | /* | |
517 | * Must have privilege. | |
518 | * No partial writes. | |
519 | * Enough data must be present. | |
520 | */ | |
521 | if (!capable(CAP_MAC_ADMIN)) | |
522 | return -EPERM; | |
523 | if (*ppos != 0) | |
524 | return -EINVAL; | |
b500ce8d | 525 | if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) |
e114e473 CS |
526 | return -EINVAL; |
527 | ||
528 | data = kzalloc(count + 1, GFP_KERNEL); | |
529 | if (data == NULL) | |
530 | return -ENOMEM; | |
531 | ||
532 | if (copy_from_user(data, buf, count) != 0) { | |
533 | rc = -EFAULT; | |
534 | goto unlockedout; | |
535 | } | |
536 | ||
537 | data[count] = '\0'; | |
538 | rule = data; | |
539 | /* | |
540 | * Only allow one writer at a time. Writes should be | |
541 | * quite rare and small in any case. | |
542 | */ | |
543 | mutex_lock(&smack_cipso_lock); | |
544 | ||
545 | skp = smk_import_entry(rule, 0); | |
546 | if (skp == NULL) | |
547 | goto out; | |
548 | ||
549 | rule += SMK_LABELLEN;; | |
550 | ret = sscanf(rule, "%d", &maplevel); | |
551 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
552 | goto out; | |
553 | ||
554 | rule += SMK_DIGITLEN; | |
555 | ret = sscanf(rule, "%d", &catlen); | |
556 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
557 | goto out; | |
558 | ||
b500ce8d | 559 | if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
e114e473 CS |
560 | goto out; |
561 | ||
562 | memset(mapcatset, 0, sizeof(mapcatset)); | |
563 | ||
564 | for (i = 0; i < catlen; i++) { | |
565 | rule += SMK_DIGITLEN; | |
566 | ret = sscanf(rule, "%d", &cat); | |
567 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) | |
568 | goto out; | |
569 | ||
570 | smack_catset_bit(cat, mapcatset); | |
571 | } | |
572 | ||
573 | if (skp->smk_cipso == NULL) { | |
574 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); | |
575 | if (scp == NULL) { | |
576 | rc = -ENOMEM; | |
577 | goto out; | |
578 | } | |
579 | } | |
580 | ||
581 | spin_lock_bh(&skp->smk_cipsolock); | |
582 | ||
583 | if (scp == NULL) | |
584 | scp = skp->smk_cipso; | |
585 | else | |
586 | skp->smk_cipso = scp; | |
587 | ||
588 | scp->smk_level = maplevel; | |
589 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); | |
590 | ||
591 | spin_unlock_bh(&skp->smk_cipsolock); | |
592 | ||
593 | rc = count; | |
594 | out: | |
595 | mutex_unlock(&smack_cipso_lock); | |
596 | unlockedout: | |
597 | kfree(data); | |
598 | return rc; | |
599 | } | |
600 | ||
601 | static const struct file_operations smk_cipso_ops = { | |
602 | .open = smk_open_cipso, | |
603 | .read = seq_read, | |
604 | .llseek = seq_lseek, | |
605 | .write = smk_write_cipso, | |
606 | .release = seq_release, | |
607 | }; | |
608 | ||
609 | /** | |
610 | * smk_read_doi - read() for /smack/doi | |
611 | * @filp: file pointer, not actually used | |
612 | * @buf: where to put the result | |
613 | * @count: maximum to send along | |
614 | * @ppos: where to start | |
615 | * | |
616 | * Returns number of bytes read or error code, as appropriate | |
617 | */ | |
618 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
619 | size_t count, loff_t *ppos) | |
620 | { | |
621 | char temp[80]; | |
622 | ssize_t rc; | |
623 | ||
624 | if (*ppos != 0) | |
625 | return 0; | |
626 | ||
627 | sprintf(temp, "%d", smk_cipso_doi_value); | |
628 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
629 | ||
630 | return rc; | |
631 | } | |
632 | ||
633 | /** | |
634 | * smk_write_doi - write() for /smack/doi | |
635 | * @filp: file pointer, not actually used | |
636 | * @buf: where to get the data from | |
637 | * @count: bytes sent | |
638 | * @ppos: where to start | |
639 | * | |
640 | * Returns number of bytes written or error code, as appropriate | |
641 | */ | |
642 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
643 | size_t count, loff_t *ppos) | |
644 | { | |
645 | char temp[80]; | |
646 | int i; | |
647 | ||
648 | if (!capable(CAP_MAC_ADMIN)) | |
649 | return -EPERM; | |
650 | ||
651 | if (count >= sizeof(temp) || count == 0) | |
652 | return -EINVAL; | |
653 | ||
654 | if (copy_from_user(temp, buf, count) != 0) | |
655 | return -EFAULT; | |
656 | ||
657 | temp[count] = '\0'; | |
658 | ||
659 | if (sscanf(temp, "%d", &i) != 1) | |
660 | return -EINVAL; | |
661 | ||
662 | smk_cipso_doi_value = i; | |
663 | ||
664 | smk_cipso_doi(); | |
665 | ||
666 | return count; | |
667 | } | |
668 | ||
669 | static const struct file_operations smk_doi_ops = { | |
670 | .read = smk_read_doi, | |
671 | .write = smk_write_doi, | |
672 | }; | |
673 | ||
674 | /** | |
675 | * smk_read_direct - read() for /smack/direct | |
676 | * @filp: file pointer, not actually used | |
677 | * @buf: where to put the result | |
678 | * @count: maximum to send along | |
679 | * @ppos: where to start | |
680 | * | |
681 | * Returns number of bytes read or error code, as appropriate | |
682 | */ | |
683 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
684 | size_t count, loff_t *ppos) | |
685 | { | |
686 | char temp[80]; | |
687 | ssize_t rc; | |
688 | ||
689 | if (*ppos != 0) | |
690 | return 0; | |
691 | ||
692 | sprintf(temp, "%d", smack_cipso_direct); | |
693 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
694 | ||
695 | return rc; | |
696 | } | |
697 | ||
698 | /** | |
699 | * smk_write_direct - write() for /smack/direct | |
700 | * @filp: file pointer, not actually used | |
701 | * @buf: where to get the data from | |
702 | * @count: bytes sent | |
703 | * @ppos: where to start | |
704 | * | |
705 | * Returns number of bytes written or error code, as appropriate | |
706 | */ | |
707 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
708 | size_t count, loff_t *ppos) | |
709 | { | |
710 | char temp[80]; | |
711 | int i; | |
712 | ||
713 | if (!capable(CAP_MAC_ADMIN)) | |
714 | return -EPERM; | |
715 | ||
716 | if (count >= sizeof(temp) || count == 0) | |
717 | return -EINVAL; | |
718 | ||
719 | if (copy_from_user(temp, buf, count) != 0) | |
720 | return -EFAULT; | |
721 | ||
722 | temp[count] = '\0'; | |
723 | ||
724 | if (sscanf(temp, "%d", &i) != 1) | |
725 | return -EINVAL; | |
726 | ||
727 | smack_cipso_direct = i; | |
728 | ||
729 | return count; | |
730 | } | |
731 | ||
732 | static const struct file_operations smk_direct_ops = { | |
733 | .read = smk_read_direct, | |
734 | .write = smk_write_direct, | |
735 | }; | |
736 | ||
737 | /** | |
738 | * smk_read_ambient - read() for /smack/ambient | |
739 | * @filp: file pointer, not actually used | |
740 | * @buf: where to put the result | |
741 | * @cn: maximum to send along | |
742 | * @ppos: where to start | |
743 | * | |
744 | * Returns number of bytes read or error code, as appropriate | |
745 | */ | |
746 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
747 | size_t cn, loff_t *ppos) | |
748 | { | |
749 | ssize_t rc; | |
e114e473 CS |
750 | int asize; |
751 | ||
752 | if (*ppos != 0) | |
753 | return 0; | |
754 | /* | |
755 | * Being careful to avoid a problem in the case where | |
756 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 757 | */ |
4bc87e62 | 758 | mutex_lock(&smack_ambient_lock); |
e114e473 | 759 | |
4bc87e62 CS |
760 | asize = strlen(smack_net_ambient) + 1; |
761 | ||
762 | if (cn >= asize) | |
763 | rc = simple_read_from_buffer(buf, cn, ppos, | |
764 | smack_net_ambient, asize); | |
765 | else | |
766 | rc = -EINVAL; | |
e114e473 | 767 | |
4bc87e62 | 768 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
769 | |
770 | return rc; | |
771 | } | |
772 | ||
773 | /** | |
774 | * smk_write_ambient - write() for /smack/ambient | |
775 | * @filp: file pointer, not actually used | |
776 | * @buf: where to get the data from | |
777 | * @count: bytes sent | |
778 | * @ppos: where to start | |
779 | * | |
780 | * Returns number of bytes written or error code, as appropriate | |
781 | */ | |
782 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
783 | size_t count, loff_t *ppos) | |
784 | { | |
785 | char in[SMK_LABELLEN]; | |
4bc87e62 | 786 | char *oldambient; |
e114e473 CS |
787 | char *smack; |
788 | ||
789 | if (!capable(CAP_MAC_ADMIN)) | |
790 | return -EPERM; | |
791 | ||
792 | if (count >= SMK_LABELLEN) | |
793 | return -EINVAL; | |
794 | ||
795 | if (copy_from_user(in, buf, count) != 0) | |
796 | return -EFAULT; | |
797 | ||
798 | smack = smk_import(in, count); | |
799 | if (smack == NULL) | |
800 | return -EINVAL; | |
801 | ||
4bc87e62 CS |
802 | mutex_lock(&smack_ambient_lock); |
803 | ||
804 | oldambient = smack_net_ambient; | |
e114e473 | 805 | smack_net_ambient = smack; |
4bc87e62 CS |
806 | smk_unlbl_ambient(oldambient); |
807 | ||
808 | mutex_unlock(&smack_ambient_lock); | |
e114e473 CS |
809 | |
810 | return count; | |
811 | } | |
812 | ||
813 | static const struct file_operations smk_ambient_ops = { | |
814 | .read = smk_read_ambient, | |
815 | .write = smk_write_ambient, | |
816 | }; | |
817 | ||
818 | struct option_names { | |
819 | int o_number; | |
820 | char *o_name; | |
821 | char *o_alias; | |
822 | }; | |
823 | ||
824 | static struct option_names netlbl_choices[] = { | |
825 | { NETLBL_NLTYPE_RIPSO, | |
826 | NETLBL_NLTYPE_RIPSO_NAME, "ripso" }, | |
827 | { NETLBL_NLTYPE_CIPSOV4, | |
828 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" }, | |
829 | { NETLBL_NLTYPE_CIPSOV4, | |
830 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" }, | |
831 | { NETLBL_NLTYPE_CIPSOV6, | |
832 | NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" }, | |
833 | { NETLBL_NLTYPE_UNLABELED, | |
834 | NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" }, | |
835 | }; | |
836 | ||
837 | /** | |
838 | * smk_read_nltype - read() for /smack/nltype | |
839 | * @filp: file pointer, not actually used | |
840 | * @buf: where to put the result | |
841 | * @count: maximum to send along | |
842 | * @ppos: where to start | |
843 | * | |
844 | * Returns number of bytes read or error code, as appropriate | |
845 | */ | |
846 | static ssize_t smk_read_nltype(struct file *filp, char __user *buf, | |
847 | size_t count, loff_t *ppos) | |
848 | { | |
849 | char bound[40]; | |
850 | ssize_t rc; | |
851 | int i; | |
852 | ||
853 | if (count < SMK_LABELLEN) | |
854 | return -EINVAL; | |
855 | ||
856 | if (*ppos != 0) | |
857 | return 0; | |
858 | ||
859 | sprintf(bound, "unknown"); | |
860 | ||
861 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) | |
862 | if (smack_net_nltype == netlbl_choices[i].o_number) { | |
863 | sprintf(bound, "%s", netlbl_choices[i].o_name); | |
864 | break; | |
865 | } | |
866 | ||
867 | rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound)); | |
868 | ||
869 | return rc; | |
870 | } | |
871 | ||
872 | /** | |
873 | * smk_write_nltype - write() for /smack/nltype | |
874 | * @filp: file pointer, not actually used | |
875 | * @buf: where to get the data from | |
876 | * @count: bytes sent | |
877 | * @ppos: where to start | |
878 | * | |
879 | * Returns number of bytes written or error code, as appropriate | |
880 | */ | |
881 | static ssize_t smk_write_nltype(struct file *file, const char __user *buf, | |
882 | size_t count, loff_t *ppos) | |
883 | { | |
884 | char bound[40]; | |
885 | char *cp; | |
886 | int i; | |
887 | ||
888 | if (!capable(CAP_MAC_ADMIN)) | |
889 | return -EPERM; | |
890 | ||
891 | if (count >= 40) | |
892 | return -EINVAL; | |
893 | ||
894 | if (copy_from_user(bound, buf, count) != 0) | |
895 | return -EFAULT; | |
896 | ||
897 | bound[count] = '\0'; | |
898 | cp = strchr(bound, ' '); | |
899 | if (cp != NULL) | |
900 | *cp = '\0'; | |
901 | cp = strchr(bound, '\n'); | |
902 | if (cp != NULL) | |
903 | *cp = '\0'; | |
904 | ||
905 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) | |
906 | if (strcmp(bound, netlbl_choices[i].o_name) == 0 || | |
907 | strcmp(bound, netlbl_choices[i].o_alias) == 0) { | |
908 | smack_net_nltype = netlbl_choices[i].o_number; | |
909 | return count; | |
910 | } | |
911 | /* | |
912 | * Not a valid choice. | |
913 | */ | |
914 | return -EINVAL; | |
915 | } | |
916 | ||
917 | static const struct file_operations smk_nltype_ops = { | |
918 | .read = smk_read_nltype, | |
919 | .write = smk_write_nltype, | |
920 | }; | |
921 | ||
922 | /** | |
923 | * smk_fill_super - fill the /smackfs superblock | |
924 | * @sb: the empty superblock | |
925 | * @data: unused | |
926 | * @silent: unused | |
927 | * | |
928 | * Fill in the well known entries for /smack | |
929 | * | |
930 | * Returns 0 on success, an error code on failure | |
931 | */ | |
932 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
933 | { | |
934 | int rc; | |
935 | struct inode *root_inode; | |
936 | ||
937 | static struct tree_descr smack_files[] = { | |
938 | [SMK_LOAD] = | |
939 | {"load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
940 | [SMK_CIPSO] = | |
941 | {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
942 | [SMK_DOI] = | |
943 | {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
944 | [SMK_DIRECT] = | |
945 | {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
946 | [SMK_AMBIENT] = | |
947 | {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
948 | [SMK_NLTYPE] = | |
949 | {"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR}, | |
950 | /* last one */ {""} | |
951 | }; | |
952 | ||
953 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
954 | if (rc != 0) { | |
955 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
956 | __func__, rc); | |
957 | return rc; | |
958 | } | |
959 | ||
960 | root_inode = sb->s_root->d_inode; | |
961 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); | |
962 | ||
963 | return 0; | |
964 | } | |
965 | ||
966 | /** | |
967 | * smk_get_sb - get the smackfs superblock | |
968 | * @fs_type: passed along without comment | |
969 | * @flags: passed along without comment | |
970 | * @dev_name: passed along without comment | |
971 | * @data: passed along without comment | |
972 | * @mnt: passed along without comment | |
973 | * | |
974 | * Just passes everything along. | |
975 | * | |
976 | * Returns what the lower level code does. | |
977 | */ | |
978 | static int smk_get_sb(struct file_system_type *fs_type, | |
979 | int flags, const char *dev_name, void *data, | |
980 | struct vfsmount *mnt) | |
981 | { | |
982 | return get_sb_single(fs_type, flags, data, smk_fill_super, mnt); | |
983 | } | |
984 | ||
985 | static struct file_system_type smk_fs_type = { | |
986 | .name = "smackfs", | |
987 | .get_sb = smk_get_sb, | |
988 | .kill_sb = kill_litter_super, | |
989 | }; | |
990 | ||
991 | static struct vfsmount *smackfs_mount; | |
992 | ||
993 | /** | |
994 | * init_smk_fs - get the smackfs superblock | |
995 | * | |
996 | * register the smackfs | |
997 | * | |
998 | * Returns 0 unless the registration fails. | |
999 | */ | |
1000 | static int __init init_smk_fs(void) | |
1001 | { | |
1002 | int err; | |
1003 | ||
1004 | err = register_filesystem(&smk_fs_type); | |
1005 | if (!err) { | |
1006 | smackfs_mount = kern_mount(&smk_fs_type); | |
1007 | if (IS_ERR(smackfs_mount)) { | |
1008 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
1009 | err = PTR_ERR(smackfs_mount); | |
1010 | smackfs_mount = NULL; | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | sema_init(&smack_write_sem, 1); | |
1015 | smk_cipso_doi(); | |
4bc87e62 | 1016 | smk_unlbl_ambient(NULL); |
e114e473 CS |
1017 | |
1018 | return err; | |
1019 | } | |
1020 | ||
1021 | __initcall(init_smk_fs); |