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e114e473 CS |
1 | /* |
2 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, version 2. | |
7 | * | |
8 | * Authors: | |
9 | * Casey Schaufler <casey@schaufler-ca.com> | |
10 | * Ahmed S. Darwish <darwish.07@gmail.com> | |
11 | * | |
12 | * Special thanks to the authors of selinuxfs. | |
13 | * | |
14 | * Karl MacMillan <kmacmillan@tresys.com> | |
15 | * James Morris <jmorris@redhat.com> | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/security.h> | |
22 | #include <linux/mutex.h> | |
23 | #include <net/netlabel.h> | |
24 | #include <net/cipso_ipv4.h> | |
25 | #include <linux/seq_file.h> | |
26 | #include <linux/ctype.h> | |
4bc87e62 | 27 | #include <linux/audit.h> |
e114e473 CS |
28 | #include "smack.h" |
29 | ||
30 | /* | |
31 | * smackfs pseudo filesystem. | |
32 | */ | |
33 | ||
34 | enum smk_inos { | |
35 | SMK_ROOT_INO = 2, | |
36 | SMK_LOAD = 3, /* load policy */ | |
37 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ | |
38 | SMK_DOI = 5, /* CIPSO DOI */ | |
39 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ | |
40 | SMK_AMBIENT = 7, /* internet ambient label */ | |
41 | SMK_NLTYPE = 8, /* label scheme to use by default */ | |
42 | }; | |
43 | ||
44 | /* | |
45 | * List locks | |
46 | */ | |
47 | static DEFINE_MUTEX(smack_list_lock); | |
48 | static DEFINE_MUTEX(smack_cipso_lock); | |
4bc87e62 | 49 | static DEFINE_MUTEX(smack_ambient_lock); |
e114e473 CS |
50 | |
51 | /* | |
52 | * This is the "ambient" label for network traffic. | |
53 | * If it isn't somehow marked, use this. | |
54 | * It can be reset via smackfs/ambient | |
55 | */ | |
56 | char *smack_net_ambient = smack_known_floor.smk_known; | |
57 | ||
58 | /* | |
59 | * This is the default packet marking scheme for network traffic. | |
60 | * It can be reset via smackfs/nltype | |
61 | */ | |
62 | int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4; | |
63 | ||
64 | /* | |
65 | * This is the level in a CIPSO header that indicates a | |
66 | * smack label is contained directly in the category set. | |
67 | * It can be reset via smackfs/direct | |
68 | */ | |
69 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
70 | ||
71 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; | |
72 | struct smk_list_entry *smack_list; | |
73 | ||
74 | #define SEQ_READ_FINISHED 1 | |
75 | ||
e114e473 CS |
76 | /* |
77 | * Values for parsing cipso rules | |
78 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
79 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
80 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
81 | */ |
82 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
83 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
84 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
85 | ||
86 | /* | |
87 | * Values for parsing MAC rules | |
88 | * SMK_ACCESS: Maximum possible combination of access permissions | |
89 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
90 | * SMK_LOADLEN: Smack rule length | |
91 | */ | |
92 | #define SMK_ACCESS "rwxa" | |
93 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
94 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
95 | ||
e114e473 CS |
96 | |
97 | /* | |
98 | * Seq_file read operations for /smack/load | |
99 | */ | |
100 | ||
101 | static void *load_seq_start(struct seq_file *s, loff_t *pos) | |
102 | { | |
103 | if (*pos == SEQ_READ_FINISHED) | |
104 | return NULL; | |
105 | ||
106 | return smack_list; | |
107 | } | |
108 | ||
109 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
110 | { | |
111 | struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next; | |
112 | ||
113 | if (skp == NULL) | |
114 | *pos = SEQ_READ_FINISHED; | |
115 | ||
116 | return skp; | |
117 | } | |
118 | ||
119 | static int load_seq_show(struct seq_file *s, void *v) | |
120 | { | |
121 | struct smk_list_entry *slp = (struct smk_list_entry *) v; | |
122 | struct smack_rule *srp = &slp->smk_rule; | |
123 | ||
124 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
125 | (char *)srp->smk_object); | |
126 | ||
127 | seq_putc(s, ' '); | |
128 | ||
129 | if (srp->smk_access & MAY_READ) | |
130 | seq_putc(s, 'r'); | |
131 | if (srp->smk_access & MAY_WRITE) | |
132 | seq_putc(s, 'w'); | |
133 | if (srp->smk_access & MAY_EXEC) | |
134 | seq_putc(s, 'x'); | |
135 | if (srp->smk_access & MAY_APPEND) | |
136 | seq_putc(s, 'a'); | |
137 | if (srp->smk_access == 0) | |
138 | seq_putc(s, '-'); | |
139 | ||
140 | seq_putc(s, '\n'); | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static void load_seq_stop(struct seq_file *s, void *v) | |
146 | { | |
147 | /* No-op */ | |
148 | } | |
149 | ||
150 | static struct seq_operations load_seq_ops = { | |
151 | .start = load_seq_start, | |
152 | .next = load_seq_next, | |
153 | .show = load_seq_show, | |
154 | .stop = load_seq_stop, | |
155 | }; | |
156 | ||
157 | /** | |
158 | * smk_open_load - open() for /smack/load | |
159 | * @inode: inode structure representing file | |
160 | * @file: "load" file pointer | |
161 | * | |
162 | * For reading, use load_seq_* seq_file reading operations. | |
163 | */ | |
164 | static int smk_open_load(struct inode *inode, struct file *file) | |
165 | { | |
cb622bbb | 166 | return seq_open(file, &load_seq_ops); |
e114e473 CS |
167 | } |
168 | ||
169 | /** | |
170 | * smk_set_access - add a rule to the rule list | |
171 | * @srp: the new rule to add | |
172 | * | |
173 | * Looks through the current subject/object/access list for | |
174 | * the subject/object pair and replaces the access that was | |
175 | * there. If the pair isn't found add it with the specified | |
176 | * access. | |
177 | */ | |
178 | static void smk_set_access(struct smack_rule *srp) | |
179 | { | |
180 | struct smk_list_entry *sp; | |
181 | struct smk_list_entry *newp; | |
182 | ||
183 | mutex_lock(&smack_list_lock); | |
184 | ||
185 | for (sp = smack_list; sp != NULL; sp = sp->smk_next) | |
186 | if (sp->smk_rule.smk_subject == srp->smk_subject && | |
187 | sp->smk_rule.smk_object == srp->smk_object) { | |
188 | sp->smk_rule.smk_access = srp->smk_access; | |
189 | break; | |
190 | } | |
191 | ||
192 | if (sp == NULL) { | |
193 | newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL); | |
194 | newp->smk_rule = *srp; | |
195 | newp->smk_next = smack_list; | |
196 | smack_list = newp; | |
197 | } | |
198 | ||
199 | mutex_unlock(&smack_list_lock); | |
200 | ||
201 | return; | |
202 | } | |
203 | ||
204 | /** | |
205 | * smk_write_load - write() for /smack/load | |
206 | * @filp: file pointer, not actually used | |
207 | * @buf: where to get the data from | |
208 | * @count: bytes sent | |
209 | * @ppos: where to start - must be 0 | |
210 | * | |
211 | * Get one smack access rule from above. | |
212 | * The format is exactly: | |
213 | * char subject[SMK_LABELLEN] | |
214 | * char object[SMK_LABELLEN] | |
b500ce8d | 215 | * char access[SMK_ACCESSLEN] |
e114e473 | 216 | * |
b500ce8d | 217 | * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. |
e114e473 | 218 | */ |
e114e473 CS |
219 | static ssize_t smk_write_load(struct file *file, const char __user *buf, |
220 | size_t count, loff_t *ppos) | |
221 | { | |
222 | struct smack_rule rule; | |
223 | char *data; | |
224 | int rc = -EINVAL; | |
225 | ||
226 | /* | |
227 | * Must have privilege. | |
228 | * No partial writes. | |
229 | * Enough data must be present. | |
230 | */ | |
231 | if (!capable(CAP_MAC_ADMIN)) | |
232 | return -EPERM; | |
233 | if (*ppos != 0) | |
234 | return -EINVAL; | |
b500ce8d | 235 | if (count != SMK_LOADLEN) |
e114e473 CS |
236 | return -EINVAL; |
237 | ||
238 | data = kzalloc(count, GFP_KERNEL); | |
239 | if (data == NULL) | |
240 | return -ENOMEM; | |
241 | ||
242 | if (copy_from_user(data, buf, count) != 0) { | |
243 | rc = -EFAULT; | |
244 | goto out; | |
245 | } | |
246 | ||
247 | rule.smk_subject = smk_import(data, 0); | |
248 | if (rule.smk_subject == NULL) | |
249 | goto out; | |
250 | ||
251 | rule.smk_object = smk_import(data + SMK_LABELLEN, 0); | |
252 | if (rule.smk_object == NULL) | |
253 | goto out; | |
254 | ||
255 | rule.smk_access = 0; | |
256 | ||
257 | switch (data[SMK_LABELLEN + SMK_LABELLEN]) { | |
258 | case '-': | |
259 | break; | |
260 | case 'r': | |
261 | case 'R': | |
262 | rule.smk_access |= MAY_READ; | |
263 | break; | |
264 | default: | |
265 | goto out; | |
266 | } | |
267 | ||
268 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { | |
269 | case '-': | |
270 | break; | |
271 | case 'w': | |
272 | case 'W': | |
273 | rule.smk_access |= MAY_WRITE; | |
274 | break; | |
275 | default: | |
276 | goto out; | |
277 | } | |
278 | ||
279 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { | |
280 | case '-': | |
281 | break; | |
282 | case 'x': | |
283 | case 'X': | |
284 | rule.smk_access |= MAY_EXEC; | |
285 | break; | |
286 | default: | |
287 | goto out; | |
288 | } | |
289 | ||
290 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { | |
291 | case '-': | |
292 | break; | |
293 | case 'a': | |
294 | case 'A': | |
295 | rule.smk_access |= MAY_READ; | |
296 | break; | |
297 | default: | |
298 | goto out; | |
299 | } | |
300 | ||
301 | smk_set_access(&rule); | |
302 | rc = count; | |
303 | ||
304 | out: | |
305 | kfree(data); | |
306 | return rc; | |
307 | } | |
308 | ||
309 | static const struct file_operations smk_load_ops = { | |
310 | .open = smk_open_load, | |
311 | .read = seq_read, | |
312 | .llseek = seq_lseek, | |
313 | .write = smk_write_load, | |
cb622bbb | 314 | .release = seq_release, |
e114e473 CS |
315 | }; |
316 | ||
317 | /** | |
318 | * smk_cipso_doi - initialize the CIPSO domain | |
319 | */ | |
320 | void smk_cipso_doi(void) | |
321 | { | |
322 | int rc; | |
323 | struct cipso_v4_doi *doip; | |
324 | struct netlbl_audit audit_info; | |
325 | ||
4bc87e62 CS |
326 | audit_info.loginuid = audit_get_loginuid(current); |
327 | audit_info.secid = smack_to_secid(current->security); | |
328 | ||
e114e473 CS |
329 | rc = netlbl_cfg_map_del(NULL, &audit_info); |
330 | if (rc != 0) | |
331 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
332 | __func__, __LINE__, rc); | |
333 | ||
334 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
335 | if (doip == NULL) | |
336 | panic("smack: Failed to initialize cipso DOI.\n"); | |
337 | doip->map.std = NULL; | |
338 | doip->doi = smk_cipso_doi_value; | |
339 | doip->type = CIPSO_V4_MAP_PASS; | |
340 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
341 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
342 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
343 | ||
344 | rc = netlbl_cfg_cipsov4_add_map(doip, NULL, &audit_info); | |
345 | if (rc != 0) | |
346 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
347 | __func__, __LINE__, rc); | |
348 | } | |
349 | ||
4bc87e62 CS |
350 | /** |
351 | * smk_unlbl_ambient - initialize the unlabeled domain | |
352 | */ | |
353 | void smk_unlbl_ambient(char *oldambient) | |
354 | { | |
355 | int rc; | |
356 | struct netlbl_audit audit_info; | |
357 | ||
358 | audit_info.loginuid = audit_get_loginuid(current); | |
359 | audit_info.secid = smack_to_secid(current->security); | |
360 | ||
361 | if (oldambient != NULL) { | |
362 | rc = netlbl_cfg_map_del(oldambient, &audit_info); | |
363 | if (rc != 0) | |
364 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
365 | __func__, __LINE__, rc); | |
366 | } | |
367 | ||
368 | rc = netlbl_cfg_unlbl_add_map(smack_net_ambient, &audit_info); | |
369 | if (rc != 0) | |
370 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
371 | __func__, __LINE__, rc); | |
372 | } | |
373 | ||
e114e473 CS |
374 | /* |
375 | * Seq_file read operations for /smack/cipso | |
376 | */ | |
377 | ||
378 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
379 | { | |
380 | if (*pos == SEQ_READ_FINISHED) | |
381 | return NULL; | |
382 | ||
383 | return smack_known; | |
384 | } | |
385 | ||
386 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
387 | { | |
388 | struct smack_known *skp = ((struct smack_known *) v)->smk_next; | |
389 | ||
390 | /* | |
391 | * Omit labels with no associated cipso value | |
392 | */ | |
393 | while (skp != NULL && !skp->smk_cipso) | |
394 | skp = skp->smk_next; | |
395 | ||
396 | if (skp == NULL) | |
397 | *pos = SEQ_READ_FINISHED; | |
398 | ||
399 | return skp; | |
400 | } | |
401 | ||
402 | /* | |
403 | * Print cipso labels in format: | |
404 | * label level[/cat[,cat]] | |
405 | */ | |
406 | static int cipso_seq_show(struct seq_file *s, void *v) | |
407 | { | |
408 | struct smack_known *skp = (struct smack_known *) v; | |
409 | struct smack_cipso *scp = skp->smk_cipso; | |
410 | char *cbp; | |
411 | char sep = '/'; | |
412 | int cat = 1; | |
413 | int i; | |
414 | unsigned char m; | |
415 | ||
416 | if (scp == NULL) | |
417 | return 0; | |
418 | ||
419 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); | |
420 | ||
421 | cbp = scp->smk_catset; | |
422 | for (i = 0; i < SMK_LABELLEN; i++) | |
423 | for (m = 0x80; m != 0; m >>= 1) { | |
424 | if (m & cbp[i]) { | |
425 | seq_printf(s, "%c%d", sep, cat); | |
426 | sep = ','; | |
427 | } | |
428 | cat++; | |
429 | } | |
430 | ||
431 | seq_putc(s, '\n'); | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | static void cipso_seq_stop(struct seq_file *s, void *v) | |
437 | { | |
438 | /* No-op */ | |
439 | } | |
440 | ||
441 | static struct seq_operations cipso_seq_ops = { | |
442 | .start = cipso_seq_start, | |
443 | .stop = cipso_seq_stop, | |
444 | .next = cipso_seq_next, | |
445 | .show = cipso_seq_show, | |
446 | }; | |
447 | ||
448 | /** | |
449 | * smk_open_cipso - open() for /smack/cipso | |
450 | * @inode: inode structure representing file | |
451 | * @file: "cipso" file pointer | |
452 | * | |
453 | * Connect our cipso_seq_* operations with /smack/cipso | |
454 | * file_operations | |
455 | */ | |
456 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
457 | { | |
458 | return seq_open(file, &cipso_seq_ops); | |
459 | } | |
460 | ||
461 | /** | |
462 | * smk_write_cipso - write() for /smack/cipso | |
463 | * @filp: file pointer, not actually used | |
464 | * @buf: where to get the data from | |
465 | * @count: bytes sent | |
466 | * @ppos: where to start | |
467 | * | |
468 | * Accepts only one cipso rule per write call. | |
469 | * Returns number of bytes written or error code, as appropriate | |
470 | */ | |
471 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
472 | size_t count, loff_t *ppos) | |
473 | { | |
474 | struct smack_known *skp; | |
475 | struct smack_cipso *scp = NULL; | |
476 | char mapcatset[SMK_LABELLEN]; | |
477 | int maplevel; | |
478 | int cat; | |
479 | int catlen; | |
480 | ssize_t rc = -EINVAL; | |
481 | char *data = NULL; | |
482 | char *rule; | |
483 | int ret; | |
484 | int i; | |
485 | ||
486 | /* | |
487 | * Must have privilege. | |
488 | * No partial writes. | |
489 | * Enough data must be present. | |
490 | */ | |
491 | if (!capable(CAP_MAC_ADMIN)) | |
492 | return -EPERM; | |
493 | if (*ppos != 0) | |
494 | return -EINVAL; | |
b500ce8d | 495 | if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) |
e114e473 CS |
496 | return -EINVAL; |
497 | ||
498 | data = kzalloc(count + 1, GFP_KERNEL); | |
499 | if (data == NULL) | |
500 | return -ENOMEM; | |
501 | ||
502 | if (copy_from_user(data, buf, count) != 0) { | |
503 | rc = -EFAULT; | |
504 | goto unlockedout; | |
505 | } | |
506 | ||
507 | data[count] = '\0'; | |
508 | rule = data; | |
509 | /* | |
510 | * Only allow one writer at a time. Writes should be | |
511 | * quite rare and small in any case. | |
512 | */ | |
513 | mutex_lock(&smack_cipso_lock); | |
514 | ||
515 | skp = smk_import_entry(rule, 0); | |
516 | if (skp == NULL) | |
517 | goto out; | |
518 | ||
519 | rule += SMK_LABELLEN;; | |
520 | ret = sscanf(rule, "%d", &maplevel); | |
521 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
522 | goto out; | |
523 | ||
524 | rule += SMK_DIGITLEN; | |
525 | ret = sscanf(rule, "%d", &catlen); | |
526 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
527 | goto out; | |
528 | ||
b500ce8d | 529 | if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
e114e473 CS |
530 | goto out; |
531 | ||
532 | memset(mapcatset, 0, sizeof(mapcatset)); | |
533 | ||
534 | for (i = 0; i < catlen; i++) { | |
535 | rule += SMK_DIGITLEN; | |
536 | ret = sscanf(rule, "%d", &cat); | |
537 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) | |
538 | goto out; | |
539 | ||
540 | smack_catset_bit(cat, mapcatset); | |
541 | } | |
542 | ||
543 | if (skp->smk_cipso == NULL) { | |
544 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); | |
545 | if (scp == NULL) { | |
546 | rc = -ENOMEM; | |
547 | goto out; | |
548 | } | |
549 | } | |
550 | ||
551 | spin_lock_bh(&skp->smk_cipsolock); | |
552 | ||
553 | if (scp == NULL) | |
554 | scp = skp->smk_cipso; | |
555 | else | |
556 | skp->smk_cipso = scp; | |
557 | ||
558 | scp->smk_level = maplevel; | |
559 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); | |
560 | ||
561 | spin_unlock_bh(&skp->smk_cipsolock); | |
562 | ||
563 | rc = count; | |
564 | out: | |
565 | mutex_unlock(&smack_cipso_lock); | |
566 | unlockedout: | |
567 | kfree(data); | |
568 | return rc; | |
569 | } | |
570 | ||
571 | static const struct file_operations smk_cipso_ops = { | |
572 | .open = smk_open_cipso, | |
573 | .read = seq_read, | |
574 | .llseek = seq_lseek, | |
575 | .write = smk_write_cipso, | |
576 | .release = seq_release, | |
577 | }; | |
578 | ||
579 | /** | |
580 | * smk_read_doi - read() for /smack/doi | |
581 | * @filp: file pointer, not actually used | |
582 | * @buf: where to put the result | |
583 | * @count: maximum to send along | |
584 | * @ppos: where to start | |
585 | * | |
586 | * Returns number of bytes read or error code, as appropriate | |
587 | */ | |
588 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
589 | size_t count, loff_t *ppos) | |
590 | { | |
591 | char temp[80]; | |
592 | ssize_t rc; | |
593 | ||
594 | if (*ppos != 0) | |
595 | return 0; | |
596 | ||
597 | sprintf(temp, "%d", smk_cipso_doi_value); | |
598 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
599 | ||
600 | return rc; | |
601 | } | |
602 | ||
603 | /** | |
604 | * smk_write_doi - write() for /smack/doi | |
605 | * @filp: file pointer, not actually used | |
606 | * @buf: where to get the data from | |
607 | * @count: bytes sent | |
608 | * @ppos: where to start | |
609 | * | |
610 | * Returns number of bytes written or error code, as appropriate | |
611 | */ | |
612 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
613 | size_t count, loff_t *ppos) | |
614 | { | |
615 | char temp[80]; | |
616 | int i; | |
617 | ||
618 | if (!capable(CAP_MAC_ADMIN)) | |
619 | return -EPERM; | |
620 | ||
621 | if (count >= sizeof(temp) || count == 0) | |
622 | return -EINVAL; | |
623 | ||
624 | if (copy_from_user(temp, buf, count) != 0) | |
625 | return -EFAULT; | |
626 | ||
627 | temp[count] = '\0'; | |
628 | ||
629 | if (sscanf(temp, "%d", &i) != 1) | |
630 | return -EINVAL; | |
631 | ||
632 | smk_cipso_doi_value = i; | |
633 | ||
634 | smk_cipso_doi(); | |
635 | ||
636 | return count; | |
637 | } | |
638 | ||
639 | static const struct file_operations smk_doi_ops = { | |
640 | .read = smk_read_doi, | |
641 | .write = smk_write_doi, | |
642 | }; | |
643 | ||
644 | /** | |
645 | * smk_read_direct - read() for /smack/direct | |
646 | * @filp: file pointer, not actually used | |
647 | * @buf: where to put the result | |
648 | * @count: maximum to send along | |
649 | * @ppos: where to start | |
650 | * | |
651 | * Returns number of bytes read or error code, as appropriate | |
652 | */ | |
653 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
654 | size_t count, loff_t *ppos) | |
655 | { | |
656 | char temp[80]; | |
657 | ssize_t rc; | |
658 | ||
659 | if (*ppos != 0) | |
660 | return 0; | |
661 | ||
662 | sprintf(temp, "%d", smack_cipso_direct); | |
663 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
664 | ||
665 | return rc; | |
666 | } | |
667 | ||
668 | /** | |
669 | * smk_write_direct - write() for /smack/direct | |
670 | * @filp: file pointer, not actually used | |
671 | * @buf: where to get the data from | |
672 | * @count: bytes sent | |
673 | * @ppos: where to start | |
674 | * | |
675 | * Returns number of bytes written or error code, as appropriate | |
676 | */ | |
677 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
678 | size_t count, loff_t *ppos) | |
679 | { | |
680 | char temp[80]; | |
681 | int i; | |
682 | ||
683 | if (!capable(CAP_MAC_ADMIN)) | |
684 | return -EPERM; | |
685 | ||
686 | if (count >= sizeof(temp) || count == 0) | |
687 | return -EINVAL; | |
688 | ||
689 | if (copy_from_user(temp, buf, count) != 0) | |
690 | return -EFAULT; | |
691 | ||
692 | temp[count] = '\0'; | |
693 | ||
694 | if (sscanf(temp, "%d", &i) != 1) | |
695 | return -EINVAL; | |
696 | ||
697 | smack_cipso_direct = i; | |
698 | ||
699 | return count; | |
700 | } | |
701 | ||
702 | static const struct file_operations smk_direct_ops = { | |
703 | .read = smk_read_direct, | |
704 | .write = smk_write_direct, | |
705 | }; | |
706 | ||
707 | /** | |
708 | * smk_read_ambient - read() for /smack/ambient | |
709 | * @filp: file pointer, not actually used | |
710 | * @buf: where to put the result | |
711 | * @cn: maximum to send along | |
712 | * @ppos: where to start | |
713 | * | |
714 | * Returns number of bytes read or error code, as appropriate | |
715 | */ | |
716 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
717 | size_t cn, loff_t *ppos) | |
718 | { | |
719 | ssize_t rc; | |
e114e473 CS |
720 | int asize; |
721 | ||
722 | if (*ppos != 0) | |
723 | return 0; | |
724 | /* | |
725 | * Being careful to avoid a problem in the case where | |
726 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 727 | */ |
4bc87e62 | 728 | mutex_lock(&smack_ambient_lock); |
e114e473 | 729 | |
4bc87e62 CS |
730 | asize = strlen(smack_net_ambient) + 1; |
731 | ||
732 | if (cn >= asize) | |
733 | rc = simple_read_from_buffer(buf, cn, ppos, | |
734 | smack_net_ambient, asize); | |
735 | else | |
736 | rc = -EINVAL; | |
e114e473 | 737 | |
4bc87e62 | 738 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
739 | |
740 | return rc; | |
741 | } | |
742 | ||
743 | /** | |
744 | * smk_write_ambient - write() for /smack/ambient | |
745 | * @filp: file pointer, not actually used | |
746 | * @buf: where to get the data from | |
747 | * @count: bytes sent | |
748 | * @ppos: where to start | |
749 | * | |
750 | * Returns number of bytes written or error code, as appropriate | |
751 | */ | |
752 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
753 | size_t count, loff_t *ppos) | |
754 | { | |
755 | char in[SMK_LABELLEN]; | |
4bc87e62 | 756 | char *oldambient; |
e114e473 CS |
757 | char *smack; |
758 | ||
759 | if (!capable(CAP_MAC_ADMIN)) | |
760 | return -EPERM; | |
761 | ||
762 | if (count >= SMK_LABELLEN) | |
763 | return -EINVAL; | |
764 | ||
765 | if (copy_from_user(in, buf, count) != 0) | |
766 | return -EFAULT; | |
767 | ||
768 | smack = smk_import(in, count); | |
769 | if (smack == NULL) | |
770 | return -EINVAL; | |
771 | ||
4bc87e62 CS |
772 | mutex_lock(&smack_ambient_lock); |
773 | ||
774 | oldambient = smack_net_ambient; | |
e114e473 | 775 | smack_net_ambient = smack; |
4bc87e62 CS |
776 | smk_unlbl_ambient(oldambient); |
777 | ||
778 | mutex_unlock(&smack_ambient_lock); | |
e114e473 CS |
779 | |
780 | return count; | |
781 | } | |
782 | ||
783 | static const struct file_operations smk_ambient_ops = { | |
784 | .read = smk_read_ambient, | |
785 | .write = smk_write_ambient, | |
786 | }; | |
787 | ||
788 | struct option_names { | |
789 | int o_number; | |
790 | char *o_name; | |
791 | char *o_alias; | |
792 | }; | |
793 | ||
794 | static struct option_names netlbl_choices[] = { | |
795 | { NETLBL_NLTYPE_RIPSO, | |
796 | NETLBL_NLTYPE_RIPSO_NAME, "ripso" }, | |
797 | { NETLBL_NLTYPE_CIPSOV4, | |
798 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" }, | |
799 | { NETLBL_NLTYPE_CIPSOV4, | |
800 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" }, | |
801 | { NETLBL_NLTYPE_CIPSOV6, | |
802 | NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" }, | |
803 | { NETLBL_NLTYPE_UNLABELED, | |
804 | NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" }, | |
805 | }; | |
806 | ||
807 | /** | |
808 | * smk_read_nltype - read() for /smack/nltype | |
809 | * @filp: file pointer, not actually used | |
810 | * @buf: where to put the result | |
811 | * @count: maximum to send along | |
812 | * @ppos: where to start | |
813 | * | |
814 | * Returns number of bytes read or error code, as appropriate | |
815 | */ | |
816 | static ssize_t smk_read_nltype(struct file *filp, char __user *buf, | |
817 | size_t count, loff_t *ppos) | |
818 | { | |
819 | char bound[40]; | |
820 | ssize_t rc; | |
821 | int i; | |
822 | ||
823 | if (count < SMK_LABELLEN) | |
824 | return -EINVAL; | |
825 | ||
826 | if (*ppos != 0) | |
827 | return 0; | |
828 | ||
829 | sprintf(bound, "unknown"); | |
830 | ||
831 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) | |
832 | if (smack_net_nltype == netlbl_choices[i].o_number) { | |
833 | sprintf(bound, "%s", netlbl_choices[i].o_name); | |
834 | break; | |
835 | } | |
836 | ||
837 | rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound)); | |
838 | ||
839 | return rc; | |
840 | } | |
841 | ||
842 | /** | |
843 | * smk_write_nltype - write() for /smack/nltype | |
844 | * @filp: file pointer, not actually used | |
845 | * @buf: where to get the data from | |
846 | * @count: bytes sent | |
847 | * @ppos: where to start | |
848 | * | |
849 | * Returns number of bytes written or error code, as appropriate | |
850 | */ | |
851 | static ssize_t smk_write_nltype(struct file *file, const char __user *buf, | |
852 | size_t count, loff_t *ppos) | |
853 | { | |
854 | char bound[40]; | |
855 | char *cp; | |
856 | int i; | |
857 | ||
858 | if (!capable(CAP_MAC_ADMIN)) | |
859 | return -EPERM; | |
860 | ||
861 | if (count >= 40) | |
862 | return -EINVAL; | |
863 | ||
864 | if (copy_from_user(bound, buf, count) != 0) | |
865 | return -EFAULT; | |
866 | ||
867 | bound[count] = '\0'; | |
868 | cp = strchr(bound, ' '); | |
869 | if (cp != NULL) | |
870 | *cp = '\0'; | |
871 | cp = strchr(bound, '\n'); | |
872 | if (cp != NULL) | |
873 | *cp = '\0'; | |
874 | ||
875 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) | |
876 | if (strcmp(bound, netlbl_choices[i].o_name) == 0 || | |
877 | strcmp(bound, netlbl_choices[i].o_alias) == 0) { | |
878 | smack_net_nltype = netlbl_choices[i].o_number; | |
879 | return count; | |
880 | } | |
881 | /* | |
882 | * Not a valid choice. | |
883 | */ | |
884 | return -EINVAL; | |
885 | } | |
886 | ||
887 | static const struct file_operations smk_nltype_ops = { | |
888 | .read = smk_read_nltype, | |
889 | .write = smk_write_nltype, | |
890 | }; | |
891 | ||
892 | /** | |
893 | * smk_fill_super - fill the /smackfs superblock | |
894 | * @sb: the empty superblock | |
895 | * @data: unused | |
896 | * @silent: unused | |
897 | * | |
898 | * Fill in the well known entries for /smack | |
899 | * | |
900 | * Returns 0 on success, an error code on failure | |
901 | */ | |
902 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
903 | { | |
904 | int rc; | |
905 | struct inode *root_inode; | |
906 | ||
907 | static struct tree_descr smack_files[] = { | |
908 | [SMK_LOAD] = | |
909 | {"load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
910 | [SMK_CIPSO] = | |
911 | {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
912 | [SMK_DOI] = | |
913 | {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
914 | [SMK_DIRECT] = | |
915 | {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
916 | [SMK_AMBIENT] = | |
917 | {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
918 | [SMK_NLTYPE] = | |
919 | {"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR}, | |
920 | /* last one */ {""} | |
921 | }; | |
922 | ||
923 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
924 | if (rc != 0) { | |
925 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
926 | __func__, rc); | |
927 | return rc; | |
928 | } | |
929 | ||
930 | root_inode = sb->s_root->d_inode; | |
931 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); | |
932 | ||
933 | return 0; | |
934 | } | |
935 | ||
936 | /** | |
937 | * smk_get_sb - get the smackfs superblock | |
938 | * @fs_type: passed along without comment | |
939 | * @flags: passed along without comment | |
940 | * @dev_name: passed along without comment | |
941 | * @data: passed along without comment | |
942 | * @mnt: passed along without comment | |
943 | * | |
944 | * Just passes everything along. | |
945 | * | |
946 | * Returns what the lower level code does. | |
947 | */ | |
948 | static int smk_get_sb(struct file_system_type *fs_type, | |
949 | int flags, const char *dev_name, void *data, | |
950 | struct vfsmount *mnt) | |
951 | { | |
952 | return get_sb_single(fs_type, flags, data, smk_fill_super, mnt); | |
953 | } | |
954 | ||
955 | static struct file_system_type smk_fs_type = { | |
956 | .name = "smackfs", | |
957 | .get_sb = smk_get_sb, | |
958 | .kill_sb = kill_litter_super, | |
959 | }; | |
960 | ||
961 | static struct vfsmount *smackfs_mount; | |
962 | ||
963 | /** | |
964 | * init_smk_fs - get the smackfs superblock | |
965 | * | |
966 | * register the smackfs | |
967 | * | |
968 | * Returns 0 unless the registration fails. | |
969 | */ | |
970 | static int __init init_smk_fs(void) | |
971 | { | |
972 | int err; | |
973 | ||
974 | err = register_filesystem(&smk_fs_type); | |
975 | if (!err) { | |
976 | smackfs_mount = kern_mount(&smk_fs_type); | |
977 | if (IS_ERR(smackfs_mount)) { | |
978 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
979 | err = PTR_ERR(smackfs_mount); | |
980 | smackfs_mount = NULL; | |
981 | } | |
982 | } | |
983 | ||
e114e473 | 984 | smk_cipso_doi(); |
4bc87e62 | 985 | smk_unlbl_ambient(NULL); |
e114e473 CS |
986 | |
987 | return err; | |
988 | } | |
989 | ||
990 | __initcall(init_smk_fs); |