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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 */ | |
15446235 | 42 | SMK_ONLYCAP = 9, /* the only "capable" label */ |
e114e473 CS |
43 | }; |
44 | ||
45 | /* | |
46 | * List locks | |
47 | */ | |
48 | static DEFINE_MUTEX(smack_list_lock); | |
49 | static DEFINE_MUTEX(smack_cipso_lock); | |
4bc87e62 | 50 | static DEFINE_MUTEX(smack_ambient_lock); |
e114e473 CS |
51 | |
52 | /* | |
53 | * This is the "ambient" label for network traffic. | |
54 | * If it isn't somehow marked, use this. | |
55 | * It can be reset via smackfs/ambient | |
56 | */ | |
57 | char *smack_net_ambient = smack_known_floor.smk_known; | |
58 | ||
59 | /* | |
60 | * This is the default packet marking scheme for network traffic. | |
61 | * It can be reset via smackfs/nltype | |
62 | */ | |
63 | int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4; | |
64 | ||
65 | /* | |
66 | * This is the level in a CIPSO header that indicates a | |
67 | * smack label is contained directly in the category set. | |
68 | * It can be reset via smackfs/direct | |
69 | */ | |
70 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
71 | ||
15446235 CS |
72 | /* |
73 | * Unless a process is running with this label even | |
74 | * having CAP_MAC_OVERRIDE isn't enough to grant | |
75 | * privilege to violate MAC policy. If no label is | |
76 | * designated (the NULL case) capabilities apply to | |
77 | * everyone. It is expected that the hat (^) label | |
78 | * will be used if any label is used. | |
79 | */ | |
80 | char *smack_onlycap; | |
81 | ||
e114e473 CS |
82 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
83 | struct smk_list_entry *smack_list; | |
84 | ||
85 | #define SEQ_READ_FINISHED 1 | |
86 | ||
e114e473 CS |
87 | /* |
88 | * Values for parsing cipso rules | |
89 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
90 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
91 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
92 | */ |
93 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
94 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
95 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
96 | ||
97 | /* | |
98 | * Values for parsing MAC rules | |
99 | * SMK_ACCESS: Maximum possible combination of access permissions | |
100 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
101 | * SMK_LOADLEN: Smack rule length | |
102 | */ | |
103 | #define SMK_ACCESS "rwxa" | |
104 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
105 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
106 | ||
e114e473 CS |
107 | |
108 | /* | |
109 | * Seq_file read operations for /smack/load | |
110 | */ | |
111 | ||
112 | static void *load_seq_start(struct seq_file *s, loff_t *pos) | |
113 | { | |
114 | if (*pos == SEQ_READ_FINISHED) | |
115 | return NULL; | |
116 | ||
117 | return smack_list; | |
118 | } | |
119 | ||
120 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
121 | { | |
122 | struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next; | |
123 | ||
124 | if (skp == NULL) | |
125 | *pos = SEQ_READ_FINISHED; | |
126 | ||
127 | return skp; | |
128 | } | |
129 | ||
130 | static int load_seq_show(struct seq_file *s, void *v) | |
131 | { | |
132 | struct smk_list_entry *slp = (struct smk_list_entry *) v; | |
133 | struct smack_rule *srp = &slp->smk_rule; | |
134 | ||
135 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
136 | (char *)srp->smk_object); | |
137 | ||
138 | seq_putc(s, ' '); | |
139 | ||
140 | if (srp->smk_access & MAY_READ) | |
141 | seq_putc(s, 'r'); | |
142 | if (srp->smk_access & MAY_WRITE) | |
143 | seq_putc(s, 'w'); | |
144 | if (srp->smk_access & MAY_EXEC) | |
145 | seq_putc(s, 'x'); | |
146 | if (srp->smk_access & MAY_APPEND) | |
147 | seq_putc(s, 'a'); | |
148 | if (srp->smk_access == 0) | |
149 | seq_putc(s, '-'); | |
150 | ||
151 | seq_putc(s, '\n'); | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | static void load_seq_stop(struct seq_file *s, void *v) | |
157 | { | |
158 | /* No-op */ | |
159 | } | |
160 | ||
161 | static struct seq_operations load_seq_ops = { | |
162 | .start = load_seq_start, | |
163 | .next = load_seq_next, | |
164 | .show = load_seq_show, | |
165 | .stop = load_seq_stop, | |
166 | }; | |
167 | ||
168 | /** | |
169 | * smk_open_load - open() for /smack/load | |
170 | * @inode: inode structure representing file | |
171 | * @file: "load" file pointer | |
172 | * | |
173 | * For reading, use load_seq_* seq_file reading operations. | |
174 | */ | |
175 | static int smk_open_load(struct inode *inode, struct file *file) | |
176 | { | |
cb622bbb | 177 | return seq_open(file, &load_seq_ops); |
e114e473 CS |
178 | } |
179 | ||
180 | /** | |
181 | * smk_set_access - add a rule to the rule list | |
182 | * @srp: the new rule to add | |
183 | * | |
184 | * Looks through the current subject/object/access list for | |
185 | * the subject/object pair and replaces the access that was | |
186 | * there. If the pair isn't found add it with the specified | |
187 | * access. | |
81ea714b SL |
188 | * |
189 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails | |
190 | * during the allocation of the new pair to add. | |
e114e473 | 191 | */ |
81ea714b | 192 | static int smk_set_access(struct smack_rule *srp) |
e114e473 CS |
193 | { |
194 | struct smk_list_entry *sp; | |
195 | struct smk_list_entry *newp; | |
81ea714b | 196 | int ret = 0; |
e114e473 CS |
197 | |
198 | mutex_lock(&smack_list_lock); | |
199 | ||
200 | for (sp = smack_list; sp != NULL; sp = sp->smk_next) | |
201 | if (sp->smk_rule.smk_subject == srp->smk_subject && | |
202 | sp->smk_rule.smk_object == srp->smk_object) { | |
203 | sp->smk_rule.smk_access = srp->smk_access; | |
204 | break; | |
205 | } | |
206 | ||
207 | if (sp == NULL) { | |
208 | newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL); | |
81ea714b SL |
209 | if (newp == NULL) { |
210 | ret = -ENOMEM; | |
211 | goto out; | |
212 | } | |
213 | ||
e114e473 CS |
214 | newp->smk_rule = *srp; |
215 | newp->smk_next = smack_list; | |
216 | smack_list = newp; | |
217 | } | |
218 | ||
81ea714b | 219 | out: |
e114e473 CS |
220 | mutex_unlock(&smack_list_lock); |
221 | ||
81ea714b | 222 | return ret; |
e114e473 CS |
223 | } |
224 | ||
225 | /** | |
226 | * smk_write_load - write() for /smack/load | |
227 | * @filp: file pointer, not actually used | |
228 | * @buf: where to get the data from | |
229 | * @count: bytes sent | |
230 | * @ppos: where to start - must be 0 | |
231 | * | |
232 | * Get one smack access rule from above. | |
233 | * The format is exactly: | |
234 | * char subject[SMK_LABELLEN] | |
235 | * char object[SMK_LABELLEN] | |
b500ce8d | 236 | * char access[SMK_ACCESSLEN] |
e114e473 | 237 | * |
b500ce8d | 238 | * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. |
e114e473 | 239 | */ |
e114e473 CS |
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; | |
b500ce8d | 256 | if (count != SMK_LOADLEN) |
e114e473 CS |
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 | ||
81ea714b SL |
322 | rc = smk_set_access(&rule); |
323 | ||
324 | if (!rc) | |
325 | rc = count; | |
e114e473 CS |
326 | |
327 | out: | |
328 | kfree(data); | |
329 | return rc; | |
330 | } | |
331 | ||
332 | static const struct file_operations smk_load_ops = { | |
333 | .open = smk_open_load, | |
334 | .read = seq_read, | |
335 | .llseek = seq_lseek, | |
336 | .write = smk_write_load, | |
cb622bbb | 337 | .release = seq_release, |
e114e473 CS |
338 | }; |
339 | ||
340 | /** | |
341 | * smk_cipso_doi - initialize the CIPSO domain | |
342 | */ | |
30aa4faf | 343 | static void smk_cipso_doi(void) |
e114e473 CS |
344 | { |
345 | int rc; | |
346 | struct cipso_v4_doi *doip; | |
347 | struct netlbl_audit audit_info; | |
348 | ||
4bc87e62 | 349 | audit_info.loginuid = audit_get_loginuid(current); |
2532386f | 350 | audit_info.sessionid = audit_get_sessionid(current); |
86a264ab | 351 | audit_info.secid = smack_to_secid(current_security()); |
4bc87e62 | 352 | |
6c2e8ac0 | 353 | rc = netlbl_cfg_map_del(NULL, PF_UNSPEC, NULL, NULL, &audit_info); |
e114e473 CS |
354 | if (rc != 0) |
355 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
356 | __func__, __LINE__, rc); | |
357 | ||
358 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
359 | if (doip == NULL) | |
360 | panic("smack: Failed to initialize cipso DOI.\n"); | |
361 | doip->map.std = NULL; | |
362 | doip->doi = smk_cipso_doi_value; | |
363 | doip->type = CIPSO_V4_MAP_PASS; | |
364 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
365 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
366 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
367 | ||
6c2e8ac0 | 368 | rc = netlbl_cfg_cipsov4_add(doip, &audit_info); |
b1edeb10 | 369 | if (rc != 0) { |
6c2e8ac0 PM |
370 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
371 | __func__, __LINE__, rc); | |
372 | kfree(doip); | |
373 | return; | |
374 | } | |
375 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, | |
376 | NULL, NULL, NULL, &audit_info); | |
377 | if (rc != 0) { | |
378 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 379 | __func__, __LINE__, rc); |
b1edeb10 | 380 | kfree(doip); |
6c2e8ac0 | 381 | return; |
b1edeb10 | 382 | } |
e114e473 CS |
383 | } |
384 | ||
4bc87e62 CS |
385 | /** |
386 | * smk_unlbl_ambient - initialize the unlabeled domain | |
387 | */ | |
30aa4faf | 388 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
389 | { |
390 | int rc; | |
391 | struct netlbl_audit audit_info; | |
392 | ||
393 | audit_info.loginuid = audit_get_loginuid(current); | |
2532386f | 394 | audit_info.sessionid = audit_get_sessionid(current); |
86a264ab | 395 | audit_info.secid = smack_to_secid(current_security()); |
4bc87e62 CS |
396 | |
397 | if (oldambient != NULL) { | |
6c2e8ac0 PM |
398 | rc = netlbl_cfg_map_del(oldambient, |
399 | PF_UNSPEC, NULL, NULL, &audit_info); | |
4bc87e62 CS |
400 | if (rc != 0) |
401 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
402 | __func__, __LINE__, rc); | |
403 | } | |
404 | ||
6c2e8ac0 PM |
405 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, |
406 | PF_INET, NULL, NULL, &audit_info); | |
4bc87e62 CS |
407 | if (rc != 0) |
408 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
409 | __func__, __LINE__, rc); | |
410 | } | |
411 | ||
e114e473 CS |
412 | /* |
413 | * Seq_file read operations for /smack/cipso | |
414 | */ | |
415 | ||
416 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
417 | { | |
418 | if (*pos == SEQ_READ_FINISHED) | |
419 | return NULL; | |
420 | ||
421 | return smack_known; | |
422 | } | |
423 | ||
424 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
425 | { | |
426 | struct smack_known *skp = ((struct smack_known *) v)->smk_next; | |
427 | ||
428 | /* | |
429 | * Omit labels with no associated cipso value | |
430 | */ | |
431 | while (skp != NULL && !skp->smk_cipso) | |
432 | skp = skp->smk_next; | |
433 | ||
434 | if (skp == NULL) | |
435 | *pos = SEQ_READ_FINISHED; | |
436 | ||
437 | return skp; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Print cipso labels in format: | |
442 | * label level[/cat[,cat]] | |
443 | */ | |
444 | static int cipso_seq_show(struct seq_file *s, void *v) | |
445 | { | |
446 | struct smack_known *skp = (struct smack_known *) v; | |
447 | struct smack_cipso *scp = skp->smk_cipso; | |
448 | char *cbp; | |
449 | char sep = '/'; | |
450 | int cat = 1; | |
451 | int i; | |
452 | unsigned char m; | |
453 | ||
454 | if (scp == NULL) | |
455 | return 0; | |
456 | ||
457 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); | |
458 | ||
459 | cbp = scp->smk_catset; | |
460 | for (i = 0; i < SMK_LABELLEN; i++) | |
461 | for (m = 0x80; m != 0; m >>= 1) { | |
462 | if (m & cbp[i]) { | |
463 | seq_printf(s, "%c%d", sep, cat); | |
464 | sep = ','; | |
465 | } | |
466 | cat++; | |
467 | } | |
468 | ||
469 | seq_putc(s, '\n'); | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | static void cipso_seq_stop(struct seq_file *s, void *v) | |
475 | { | |
476 | /* No-op */ | |
477 | } | |
478 | ||
479 | static struct seq_operations cipso_seq_ops = { | |
480 | .start = cipso_seq_start, | |
481 | .stop = cipso_seq_stop, | |
482 | .next = cipso_seq_next, | |
483 | .show = cipso_seq_show, | |
484 | }; | |
485 | ||
486 | /** | |
487 | * smk_open_cipso - open() for /smack/cipso | |
488 | * @inode: inode structure representing file | |
489 | * @file: "cipso" file pointer | |
490 | * | |
491 | * Connect our cipso_seq_* operations with /smack/cipso | |
492 | * file_operations | |
493 | */ | |
494 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
495 | { | |
496 | return seq_open(file, &cipso_seq_ops); | |
497 | } | |
498 | ||
499 | /** | |
500 | * smk_write_cipso - write() for /smack/cipso | |
501 | * @filp: file pointer, not actually used | |
502 | * @buf: where to get the data from | |
503 | * @count: bytes sent | |
504 | * @ppos: where to start | |
505 | * | |
506 | * Accepts only one cipso rule per write call. | |
507 | * Returns number of bytes written or error code, as appropriate | |
508 | */ | |
509 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
510 | size_t count, loff_t *ppos) | |
511 | { | |
512 | struct smack_known *skp; | |
513 | struct smack_cipso *scp = NULL; | |
514 | char mapcatset[SMK_LABELLEN]; | |
515 | int maplevel; | |
516 | int cat; | |
517 | int catlen; | |
518 | ssize_t rc = -EINVAL; | |
519 | char *data = NULL; | |
520 | char *rule; | |
521 | int ret; | |
522 | int i; | |
523 | ||
524 | /* | |
525 | * Must have privilege. | |
526 | * No partial writes. | |
527 | * Enough data must be present. | |
528 | */ | |
529 | if (!capable(CAP_MAC_ADMIN)) | |
530 | return -EPERM; | |
531 | if (*ppos != 0) | |
532 | return -EINVAL; | |
b500ce8d | 533 | if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) |
e114e473 CS |
534 | return -EINVAL; |
535 | ||
536 | data = kzalloc(count + 1, GFP_KERNEL); | |
537 | if (data == NULL) | |
538 | return -ENOMEM; | |
539 | ||
540 | if (copy_from_user(data, buf, count) != 0) { | |
541 | rc = -EFAULT; | |
542 | goto unlockedout; | |
543 | } | |
544 | ||
545 | data[count] = '\0'; | |
546 | rule = data; | |
547 | /* | |
548 | * Only allow one writer at a time. Writes should be | |
549 | * quite rare and small in any case. | |
550 | */ | |
551 | mutex_lock(&smack_cipso_lock); | |
552 | ||
553 | skp = smk_import_entry(rule, 0); | |
554 | if (skp == NULL) | |
555 | goto out; | |
556 | ||
557 | rule += SMK_LABELLEN;; | |
558 | ret = sscanf(rule, "%d", &maplevel); | |
559 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
560 | goto out; | |
561 | ||
562 | rule += SMK_DIGITLEN; | |
563 | ret = sscanf(rule, "%d", &catlen); | |
564 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
565 | goto out; | |
566 | ||
b500ce8d | 567 | if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
e114e473 CS |
568 | goto out; |
569 | ||
570 | memset(mapcatset, 0, sizeof(mapcatset)); | |
571 | ||
572 | for (i = 0; i < catlen; i++) { | |
573 | rule += SMK_DIGITLEN; | |
574 | ret = sscanf(rule, "%d", &cat); | |
575 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) | |
576 | goto out; | |
577 | ||
578 | smack_catset_bit(cat, mapcatset); | |
579 | } | |
580 | ||
581 | if (skp->smk_cipso == NULL) { | |
582 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); | |
583 | if (scp == NULL) { | |
584 | rc = -ENOMEM; | |
585 | goto out; | |
586 | } | |
587 | } | |
588 | ||
589 | spin_lock_bh(&skp->smk_cipsolock); | |
590 | ||
591 | if (scp == NULL) | |
592 | scp = skp->smk_cipso; | |
593 | else | |
594 | skp->smk_cipso = scp; | |
595 | ||
596 | scp->smk_level = maplevel; | |
597 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); | |
598 | ||
599 | spin_unlock_bh(&skp->smk_cipsolock); | |
600 | ||
601 | rc = count; | |
602 | out: | |
603 | mutex_unlock(&smack_cipso_lock); | |
604 | unlockedout: | |
605 | kfree(data); | |
606 | return rc; | |
607 | } | |
608 | ||
609 | static const struct file_operations smk_cipso_ops = { | |
610 | .open = smk_open_cipso, | |
611 | .read = seq_read, | |
612 | .llseek = seq_lseek, | |
613 | .write = smk_write_cipso, | |
614 | .release = seq_release, | |
615 | }; | |
616 | ||
617 | /** | |
618 | * smk_read_doi - read() for /smack/doi | |
619 | * @filp: file pointer, not actually used | |
620 | * @buf: where to put the result | |
621 | * @count: maximum to send along | |
622 | * @ppos: where to start | |
623 | * | |
624 | * Returns number of bytes read or error code, as appropriate | |
625 | */ | |
626 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
627 | size_t count, loff_t *ppos) | |
628 | { | |
629 | char temp[80]; | |
630 | ssize_t rc; | |
631 | ||
632 | if (*ppos != 0) | |
633 | return 0; | |
634 | ||
635 | sprintf(temp, "%d", smk_cipso_doi_value); | |
636 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
637 | ||
638 | return rc; | |
639 | } | |
640 | ||
641 | /** | |
642 | * smk_write_doi - write() for /smack/doi | |
643 | * @filp: file pointer, not actually used | |
644 | * @buf: where to get the data from | |
645 | * @count: bytes sent | |
646 | * @ppos: where to start | |
647 | * | |
648 | * Returns number of bytes written or error code, as appropriate | |
649 | */ | |
650 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
651 | size_t count, loff_t *ppos) | |
652 | { | |
653 | char temp[80]; | |
654 | int i; | |
655 | ||
656 | if (!capable(CAP_MAC_ADMIN)) | |
657 | return -EPERM; | |
658 | ||
659 | if (count >= sizeof(temp) || count == 0) | |
660 | return -EINVAL; | |
661 | ||
662 | if (copy_from_user(temp, buf, count) != 0) | |
663 | return -EFAULT; | |
664 | ||
665 | temp[count] = '\0'; | |
666 | ||
667 | if (sscanf(temp, "%d", &i) != 1) | |
668 | return -EINVAL; | |
669 | ||
670 | smk_cipso_doi_value = i; | |
671 | ||
672 | smk_cipso_doi(); | |
673 | ||
674 | return count; | |
675 | } | |
676 | ||
677 | static const struct file_operations smk_doi_ops = { | |
678 | .read = smk_read_doi, | |
679 | .write = smk_write_doi, | |
680 | }; | |
681 | ||
682 | /** | |
683 | * smk_read_direct - read() for /smack/direct | |
684 | * @filp: file pointer, not actually used | |
685 | * @buf: where to put the result | |
686 | * @count: maximum to send along | |
687 | * @ppos: where to start | |
688 | * | |
689 | * Returns number of bytes read or error code, as appropriate | |
690 | */ | |
691 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
692 | size_t count, loff_t *ppos) | |
693 | { | |
694 | char temp[80]; | |
695 | ssize_t rc; | |
696 | ||
697 | if (*ppos != 0) | |
698 | return 0; | |
699 | ||
700 | sprintf(temp, "%d", smack_cipso_direct); | |
701 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
702 | ||
703 | return rc; | |
704 | } | |
705 | ||
706 | /** | |
707 | * smk_write_direct - write() for /smack/direct | |
708 | * @filp: file pointer, not actually used | |
709 | * @buf: where to get the data from | |
710 | * @count: bytes sent | |
711 | * @ppos: where to start | |
712 | * | |
713 | * Returns number of bytes written or error code, as appropriate | |
714 | */ | |
715 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
716 | size_t count, loff_t *ppos) | |
717 | { | |
718 | char temp[80]; | |
719 | int i; | |
720 | ||
721 | if (!capable(CAP_MAC_ADMIN)) | |
722 | return -EPERM; | |
723 | ||
724 | if (count >= sizeof(temp) || count == 0) | |
725 | return -EINVAL; | |
726 | ||
727 | if (copy_from_user(temp, buf, count) != 0) | |
728 | return -EFAULT; | |
729 | ||
730 | temp[count] = '\0'; | |
731 | ||
732 | if (sscanf(temp, "%d", &i) != 1) | |
733 | return -EINVAL; | |
734 | ||
735 | smack_cipso_direct = i; | |
736 | ||
737 | return count; | |
738 | } | |
739 | ||
740 | static const struct file_operations smk_direct_ops = { | |
741 | .read = smk_read_direct, | |
742 | .write = smk_write_direct, | |
743 | }; | |
744 | ||
745 | /** | |
746 | * smk_read_ambient - read() for /smack/ambient | |
747 | * @filp: file pointer, not actually used | |
748 | * @buf: where to put the result | |
749 | * @cn: maximum to send along | |
750 | * @ppos: where to start | |
751 | * | |
752 | * Returns number of bytes read or error code, as appropriate | |
753 | */ | |
754 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
755 | size_t cn, loff_t *ppos) | |
756 | { | |
757 | ssize_t rc; | |
e114e473 CS |
758 | int asize; |
759 | ||
760 | if (*ppos != 0) | |
761 | return 0; | |
762 | /* | |
763 | * Being careful to avoid a problem in the case where | |
764 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 765 | */ |
4bc87e62 | 766 | mutex_lock(&smack_ambient_lock); |
e114e473 | 767 | |
4bc87e62 CS |
768 | asize = strlen(smack_net_ambient) + 1; |
769 | ||
770 | if (cn >= asize) | |
771 | rc = simple_read_from_buffer(buf, cn, ppos, | |
772 | smack_net_ambient, asize); | |
773 | else | |
774 | rc = -EINVAL; | |
e114e473 | 775 | |
4bc87e62 | 776 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
777 | |
778 | return rc; | |
779 | } | |
780 | ||
781 | /** | |
782 | * smk_write_ambient - write() for /smack/ambient | |
783 | * @filp: file pointer, not actually used | |
784 | * @buf: where to get the data from | |
785 | * @count: bytes sent | |
786 | * @ppos: where to start | |
787 | * | |
788 | * Returns number of bytes written or error code, as appropriate | |
789 | */ | |
790 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
791 | size_t count, loff_t *ppos) | |
792 | { | |
793 | char in[SMK_LABELLEN]; | |
4bc87e62 | 794 | char *oldambient; |
e114e473 CS |
795 | char *smack; |
796 | ||
797 | if (!capable(CAP_MAC_ADMIN)) | |
798 | return -EPERM; | |
799 | ||
800 | if (count >= SMK_LABELLEN) | |
801 | return -EINVAL; | |
802 | ||
803 | if (copy_from_user(in, buf, count) != 0) | |
804 | return -EFAULT; | |
805 | ||
806 | smack = smk_import(in, count); | |
807 | if (smack == NULL) | |
808 | return -EINVAL; | |
809 | ||
4bc87e62 CS |
810 | mutex_lock(&smack_ambient_lock); |
811 | ||
812 | oldambient = smack_net_ambient; | |
e114e473 | 813 | smack_net_ambient = smack; |
4bc87e62 CS |
814 | smk_unlbl_ambient(oldambient); |
815 | ||
816 | mutex_unlock(&smack_ambient_lock); | |
e114e473 CS |
817 | |
818 | return count; | |
819 | } | |
820 | ||
821 | static const struct file_operations smk_ambient_ops = { | |
822 | .read = smk_read_ambient, | |
823 | .write = smk_write_ambient, | |
824 | }; | |
825 | ||
15446235 CS |
826 | /** |
827 | * smk_read_onlycap - read() for /smack/onlycap | |
828 | * @filp: file pointer, not actually used | |
829 | * @buf: where to put the result | |
830 | * @cn: maximum to send along | |
831 | * @ppos: where to start | |
832 | * | |
833 | * Returns number of bytes read or error code, as appropriate | |
834 | */ | |
835 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, | |
836 | size_t cn, loff_t *ppos) | |
837 | { | |
838 | char *smack = ""; | |
839 | ssize_t rc = -EINVAL; | |
840 | int asize; | |
841 | ||
842 | if (*ppos != 0) | |
843 | return 0; | |
844 | ||
845 | if (smack_onlycap != NULL) | |
846 | smack = smack_onlycap; | |
847 | ||
848 | asize = strlen(smack) + 1; | |
849 | ||
850 | if (cn >= asize) | |
851 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
852 | ||
853 | return rc; | |
854 | } | |
855 | ||
856 | /** | |
857 | * smk_write_onlycap - write() for /smack/onlycap | |
858 | * @filp: file pointer, not actually used | |
859 | * @buf: where to get the data from | |
860 | * @count: bytes sent | |
861 | * @ppos: where to start | |
862 | * | |
863 | * Returns number of bytes written or error code, as appropriate | |
864 | */ | |
865 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
866 | size_t count, loff_t *ppos) | |
867 | { | |
868 | char in[SMK_LABELLEN]; | |
b6dff3ec | 869 | char *sp = current->cred->security; |
15446235 CS |
870 | |
871 | if (!capable(CAP_MAC_ADMIN)) | |
872 | return -EPERM; | |
873 | ||
874 | /* | |
875 | * This can be done using smk_access() but is done | |
876 | * explicitly for clarity. The smk_access() implementation | |
877 | * would use smk_access(smack_onlycap, MAY_WRITE) | |
878 | */ | |
879 | if (smack_onlycap != NULL && smack_onlycap != sp) | |
880 | return -EPERM; | |
881 | ||
882 | if (count >= SMK_LABELLEN) | |
883 | return -EINVAL; | |
884 | ||
885 | if (copy_from_user(in, buf, count) != 0) | |
886 | return -EFAULT; | |
887 | ||
888 | /* | |
889 | * Should the null string be passed in unset the onlycap value. | |
890 | * This seems like something to be careful with as usually | |
891 | * smk_import only expects to return NULL for errors. It | |
892 | * is usually the case that a nullstring or "\n" would be | |
893 | * bad to pass to smk_import but in fact this is useful here. | |
894 | */ | |
895 | smack_onlycap = smk_import(in, count); | |
896 | ||
897 | return count; | |
898 | } | |
899 | ||
900 | static const struct file_operations smk_onlycap_ops = { | |
901 | .read = smk_read_onlycap, | |
902 | .write = smk_write_onlycap, | |
903 | }; | |
904 | ||
e114e473 CS |
905 | struct option_names { |
906 | int o_number; | |
907 | char *o_name; | |
908 | char *o_alias; | |
909 | }; | |
910 | ||
911 | static struct option_names netlbl_choices[] = { | |
912 | { NETLBL_NLTYPE_RIPSO, | |
913 | NETLBL_NLTYPE_RIPSO_NAME, "ripso" }, | |
914 | { NETLBL_NLTYPE_CIPSOV4, | |
915 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" }, | |
916 | { NETLBL_NLTYPE_CIPSOV4, | |
917 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" }, | |
918 | { NETLBL_NLTYPE_CIPSOV6, | |
919 | NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" }, | |
920 | { NETLBL_NLTYPE_UNLABELED, | |
921 | NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" }, | |
922 | }; | |
923 | ||
924 | /** | |
925 | * smk_read_nltype - read() for /smack/nltype | |
926 | * @filp: file pointer, not actually used | |
927 | * @buf: where to put the result | |
928 | * @count: maximum to send along | |
929 | * @ppos: where to start | |
930 | * | |
931 | * Returns number of bytes read or error code, as appropriate | |
932 | */ | |
933 | static ssize_t smk_read_nltype(struct file *filp, char __user *buf, | |
934 | size_t count, loff_t *ppos) | |
935 | { | |
936 | char bound[40]; | |
937 | ssize_t rc; | |
938 | int i; | |
939 | ||
940 | if (count < SMK_LABELLEN) | |
941 | return -EINVAL; | |
942 | ||
943 | if (*ppos != 0) | |
944 | return 0; | |
945 | ||
946 | sprintf(bound, "unknown"); | |
947 | ||
948 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) | |
949 | if (smack_net_nltype == netlbl_choices[i].o_number) { | |
950 | sprintf(bound, "%s", netlbl_choices[i].o_name); | |
951 | break; | |
952 | } | |
953 | ||
954 | rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound)); | |
955 | ||
956 | return rc; | |
957 | } | |
958 | ||
959 | /** | |
960 | * smk_write_nltype - write() for /smack/nltype | |
961 | * @filp: file pointer, not actually used | |
962 | * @buf: where to get the data from | |
963 | * @count: bytes sent | |
964 | * @ppos: where to start | |
965 | * | |
966 | * Returns number of bytes written or error code, as appropriate | |
967 | */ | |
968 | static ssize_t smk_write_nltype(struct file *file, const char __user *buf, | |
969 | size_t count, loff_t *ppos) | |
970 | { | |
971 | char bound[40]; | |
972 | char *cp; | |
973 | int i; | |
974 | ||
975 | if (!capable(CAP_MAC_ADMIN)) | |
976 | return -EPERM; | |
977 | ||
978 | if (count >= 40) | |
979 | return -EINVAL; | |
980 | ||
981 | if (copy_from_user(bound, buf, count) != 0) | |
982 | return -EFAULT; | |
983 | ||
984 | bound[count] = '\0'; | |
985 | cp = strchr(bound, ' '); | |
986 | if (cp != NULL) | |
987 | *cp = '\0'; | |
988 | cp = strchr(bound, '\n'); | |
989 | if (cp != NULL) | |
990 | *cp = '\0'; | |
991 | ||
992 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) | |
993 | if (strcmp(bound, netlbl_choices[i].o_name) == 0 || | |
994 | strcmp(bound, netlbl_choices[i].o_alias) == 0) { | |
995 | smack_net_nltype = netlbl_choices[i].o_number; | |
996 | return count; | |
997 | } | |
998 | /* | |
999 | * Not a valid choice. | |
1000 | */ | |
1001 | return -EINVAL; | |
1002 | } | |
1003 | ||
1004 | static const struct file_operations smk_nltype_ops = { | |
1005 | .read = smk_read_nltype, | |
1006 | .write = smk_write_nltype, | |
1007 | }; | |
1008 | ||
1009 | /** | |
1010 | * smk_fill_super - fill the /smackfs superblock | |
1011 | * @sb: the empty superblock | |
1012 | * @data: unused | |
1013 | * @silent: unused | |
1014 | * | |
1015 | * Fill in the well known entries for /smack | |
1016 | * | |
1017 | * Returns 0 on success, an error code on failure | |
1018 | */ | |
1019 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
1020 | { | |
1021 | int rc; | |
1022 | struct inode *root_inode; | |
1023 | ||
1024 | static struct tree_descr smack_files[] = { | |
1025 | [SMK_LOAD] = | |
1026 | {"load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
1027 | [SMK_CIPSO] = | |
1028 | {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
1029 | [SMK_DOI] = | |
1030 | {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
1031 | [SMK_DIRECT] = | |
1032 | {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
1033 | [SMK_AMBIENT] = | |
1034 | {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
1035 | [SMK_NLTYPE] = | |
1036 | {"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR}, | |
15446235 CS |
1037 | [SMK_ONLYCAP] = |
1038 | {"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
e114e473 CS |
1039 | /* last one */ {""} |
1040 | }; | |
1041 | ||
1042 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
1043 | if (rc != 0) { | |
1044 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
1045 | __func__, rc); | |
1046 | return rc; | |
1047 | } | |
1048 | ||
1049 | root_inode = sb->s_root->d_inode; | |
1050 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); | |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | /** | |
1056 | * smk_get_sb - get the smackfs superblock | |
1057 | * @fs_type: passed along without comment | |
1058 | * @flags: passed along without comment | |
1059 | * @dev_name: passed along without comment | |
1060 | * @data: passed along without comment | |
1061 | * @mnt: passed along without comment | |
1062 | * | |
1063 | * Just passes everything along. | |
1064 | * | |
1065 | * Returns what the lower level code does. | |
1066 | */ | |
1067 | static int smk_get_sb(struct file_system_type *fs_type, | |
1068 | int flags, const char *dev_name, void *data, | |
1069 | struct vfsmount *mnt) | |
1070 | { | |
1071 | return get_sb_single(fs_type, flags, data, smk_fill_super, mnt); | |
1072 | } | |
1073 | ||
1074 | static struct file_system_type smk_fs_type = { | |
1075 | .name = "smackfs", | |
1076 | .get_sb = smk_get_sb, | |
1077 | .kill_sb = kill_litter_super, | |
1078 | }; | |
1079 | ||
1080 | static struct vfsmount *smackfs_mount; | |
1081 | ||
1082 | /** | |
1083 | * init_smk_fs - get the smackfs superblock | |
1084 | * | |
1085 | * register the smackfs | |
1086 | * | |
076c54c5 AD |
1087 | * Do not register smackfs if Smack wasn't enabled |
1088 | * on boot. We can not put this method normally under the | |
1089 | * smack_init() code path since the security subsystem get | |
1090 | * initialized before the vfs caches. | |
1091 | * | |
1092 | * Returns true if we were not chosen on boot or if | |
1093 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
1094 | */ |
1095 | static int __init init_smk_fs(void) | |
1096 | { | |
1097 | int err; | |
1098 | ||
076c54c5 AD |
1099 | if (!security_module_enable(&smack_ops)) |
1100 | return 0; | |
1101 | ||
e114e473 CS |
1102 | err = register_filesystem(&smk_fs_type); |
1103 | if (!err) { | |
1104 | smackfs_mount = kern_mount(&smk_fs_type); | |
1105 | if (IS_ERR(smackfs_mount)) { | |
1106 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
1107 | err = PTR_ERR(smackfs_mount); | |
1108 | smackfs_mount = NULL; | |
1109 | } | |
1110 | } | |
1111 | ||
e114e473 | 1112 | smk_cipso_doi(); |
4bc87e62 | 1113 | smk_unlbl_ambient(NULL); |
e114e473 CS |
1114 | |
1115 | return err; | |
1116 | } | |
1117 | ||
1118 | __initcall(init_smk_fs); |