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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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
6d3dc07c | 24 | #include <net/net_namespace.h> |
e114e473 CS |
25 | #include <net/netlabel.h> |
26 | #include <net/cipso_ipv4.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/ctype.h> | |
4bc87e62 | 29 | #include <linux/audit.h> |
e114e473 CS |
30 | #include "smack.h" |
31 | ||
32 | /* | |
33 | * smackfs pseudo filesystem. | |
34 | */ | |
35 | ||
36 | enum smk_inos { | |
37 | SMK_ROOT_INO = 2, | |
38 | SMK_LOAD = 3, /* load policy */ | |
39 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ | |
40 | SMK_DOI = 5, /* CIPSO DOI */ | |
41 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ | |
42 | SMK_AMBIENT = 7, /* internet ambient label */ | |
6d3dc07c | 43 | SMK_NETLBLADDR = 8, /* single label hosts */ |
15446235 | 44 | SMK_ONLYCAP = 9, /* the only "capable" label */ |
ecfcc53f | 45 | SMK_LOGGING = 10, /* logging */ |
7898e1f8 | 46 | SMK_LOAD_SELF = 11, /* task specific rules */ |
e114e473 CS |
47 | }; |
48 | ||
49 | /* | |
50 | * List locks | |
51 | */ | |
52 | static DEFINE_MUTEX(smack_list_lock); | |
53 | static DEFINE_MUTEX(smack_cipso_lock); | |
4bc87e62 | 54 | static DEFINE_MUTEX(smack_ambient_lock); |
6d3dc07c | 55 | static DEFINE_MUTEX(smk_netlbladdr_lock); |
e114e473 CS |
56 | |
57 | /* | |
58 | * This is the "ambient" label for network traffic. | |
59 | * If it isn't somehow marked, use this. | |
60 | * It can be reset via smackfs/ambient | |
61 | */ | |
62 | char *smack_net_ambient = smack_known_floor.smk_known; | |
63 | ||
e114e473 CS |
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 | ||
15446235 CS |
71 | /* |
72 | * Unless a process is running with this label even | |
73 | * having CAP_MAC_OVERRIDE isn't enough to grant | |
74 | * privilege to violate MAC policy. If no label is | |
75 | * designated (the NULL case) capabilities apply to | |
76 | * everyone. It is expected that the hat (^) label | |
77 | * will be used if any label is used. | |
78 | */ | |
79 | char *smack_onlycap; | |
80 | ||
6d3dc07c CS |
81 | /* |
82 | * Certain IP addresses may be designated as single label hosts. | |
83 | * Packets are sent there unlabeled, but only from tasks that | |
84 | * can write to the specified label. | |
85 | */ | |
7198e2ee EB |
86 | |
87 | LIST_HEAD(smk_netlbladdr_list); | |
88 | LIST_HEAD(smack_rule_list); | |
6d3dc07c | 89 | |
e114e473 | 90 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 91 | |
4303154e EB |
92 | const char *smack_cipso_option = SMACK_CIPSO_OPTION; |
93 | ||
94 | ||
e114e473 CS |
95 | #define SEQ_READ_FINISHED 1 |
96 | ||
e114e473 CS |
97 | /* |
98 | * Values for parsing cipso rules | |
99 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
100 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
101 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
102 | */ |
103 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
104 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
105 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
106 | ||
107 | /* | |
108 | * Values for parsing MAC rules | |
109 | * SMK_ACCESS: Maximum possible combination of access permissions | |
110 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
111 | * SMK_LOADLEN: Smack rule length | |
112 | */ | |
5c6d1125 JS |
113 | #define SMK_OACCESS "rwxa" |
114 | #define SMK_ACCESS "rwxat" | |
115 | #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) | |
116 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
117 | #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) | |
118 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
b500ce8d | 119 | |
6d3dc07c CS |
120 | /** |
121 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
122 | * @nap: structure to fill | |
123 | */ | |
124 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
125 | { | |
126 | nap->loginuid = audit_get_loginuid(current); | |
127 | nap->sessionid = audit_get_sessionid(current); | |
676dac4b | 128 | nap->secid = smack_to_secid(smk_of_current()); |
6d3dc07c CS |
129 | } |
130 | ||
131 | /* | |
132 | * Values for parsing single label host rules | |
133 | * "1.2.3.4 X" | |
134 | * "192.168.138.129/32 abcdefghijklmnopqrstuvw" | |
135 | */ | |
136 | #define SMK_NETLBLADDRMIN 9 | |
137 | #define SMK_NETLBLADDRMAX 42 | |
e114e473 | 138 | |
e114e473 CS |
139 | /** |
140 | * smk_set_access - add a rule to the rule list | |
141 | * @srp: the new rule to add | |
7898e1f8 CS |
142 | * @rule_list: the list of rules |
143 | * @rule_lock: the rule list lock | |
e114e473 CS |
144 | * |
145 | * Looks through the current subject/object/access list for | |
146 | * the subject/object pair and replaces the access that was | |
147 | * there. If the pair isn't found add it with the specified | |
148 | * access. | |
81ea714b | 149 | * |
7898e1f8 | 150 | * Returns 1 if a rule was found to exist already, 0 if it is new |
81ea714b SL |
151 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails |
152 | * during the allocation of the new pair to add. | |
e114e473 | 153 | */ |
7898e1f8 CS |
154 | static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list, |
155 | struct mutex *rule_lock) | |
e114e473 | 156 | { |
7198e2ee | 157 | struct smack_rule *sp; |
7898e1f8 | 158 | int found = 0; |
e114e473 | 159 | |
7898e1f8 CS |
160 | mutex_lock(rule_lock); |
161 | ||
162 | list_for_each_entry_rcu(sp, rule_list, list) { | |
7198e2ee EB |
163 | if (sp->smk_subject == srp->smk_subject && |
164 | sp->smk_object == srp->smk_object) { | |
165 | found = 1; | |
166 | sp->smk_access = srp->smk_access; | |
e114e473 CS |
167 | break; |
168 | } | |
e114e473 | 169 | } |
7198e2ee | 170 | if (found == 0) |
7898e1f8 | 171 | list_add_rcu(&srp->list, rule_list); |
e114e473 | 172 | |
7898e1f8 | 173 | mutex_unlock(rule_lock); |
e114e473 | 174 | |
7898e1f8 | 175 | return found; |
e114e473 CS |
176 | } |
177 | ||
178 | /** | |
7898e1f8 | 179 | * smk_write_load_list - write() for any /smack/load |
251a2a95 | 180 | * @file: file pointer, not actually used |
e114e473 CS |
181 | * @buf: where to get the data from |
182 | * @count: bytes sent | |
183 | * @ppos: where to start - must be 0 | |
7898e1f8 CS |
184 | * @rule_list: the list of rules to write to |
185 | * @rule_lock: lock for the rule list | |
e114e473 CS |
186 | * |
187 | * Get one smack access rule from above. | |
188 | * The format is exactly: | |
189 | * char subject[SMK_LABELLEN] | |
190 | * char object[SMK_LABELLEN] | |
b500ce8d | 191 | * char access[SMK_ACCESSLEN] |
e114e473 | 192 | * |
b500ce8d | 193 | * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. |
e114e473 | 194 | */ |
7898e1f8 CS |
195 | static ssize_t smk_write_load_list(struct file *file, const char __user *buf, |
196 | size_t count, loff_t *ppos, | |
197 | struct list_head *rule_list, | |
198 | struct mutex *rule_lock) | |
e114e473 | 199 | { |
7198e2ee | 200 | struct smack_rule *rule; |
e114e473 CS |
201 | char *data; |
202 | int rc = -EINVAL; | |
203 | ||
204 | /* | |
e114e473 CS |
205 | * No partial writes. |
206 | * Enough data must be present. | |
207 | */ | |
5c6d1125 JS |
208 | if (*ppos != 0) |
209 | return -EINVAL; | |
210 | /* | |
25985edc | 211 | * Minor hack for backward compatibility |
5c6d1125 JS |
212 | */ |
213 | if (count < (SMK_OLOADLEN) || count > SMK_LOADLEN) | |
e114e473 CS |
214 | return -EINVAL; |
215 | ||
5c6d1125 | 216 | data = kzalloc(SMK_LOADLEN, GFP_KERNEL); |
e114e473 CS |
217 | if (data == NULL) |
218 | return -ENOMEM; | |
219 | ||
220 | if (copy_from_user(data, buf, count) != 0) { | |
221 | rc = -EFAULT; | |
222 | goto out; | |
223 | } | |
224 | ||
5c6d1125 | 225 | /* |
25985edc | 226 | * More on the minor hack for backward compatibility |
5c6d1125 JS |
227 | */ |
228 | if (count == (SMK_OLOADLEN)) | |
229 | data[SMK_OLOADLEN] = '-'; | |
230 | ||
7198e2ee EB |
231 | rule = kzalloc(sizeof(*rule), GFP_KERNEL); |
232 | if (rule == NULL) { | |
233 | rc = -ENOMEM; | |
e114e473 | 234 | goto out; |
7198e2ee | 235 | } |
e114e473 | 236 | |
7198e2ee EB |
237 | rule->smk_subject = smk_import(data, 0); |
238 | if (rule->smk_subject == NULL) | |
239 | goto out_free_rule; | |
e114e473 | 240 | |
7198e2ee EB |
241 | rule->smk_object = smk_import(data + SMK_LABELLEN, 0); |
242 | if (rule->smk_object == NULL) | |
243 | goto out_free_rule; | |
244 | ||
245 | rule->smk_access = 0; | |
e114e473 CS |
246 | |
247 | switch (data[SMK_LABELLEN + SMK_LABELLEN]) { | |
248 | case '-': | |
249 | break; | |
250 | case 'r': | |
251 | case 'R': | |
7198e2ee | 252 | rule->smk_access |= MAY_READ; |
e114e473 CS |
253 | break; |
254 | default: | |
7198e2ee | 255 | goto out_free_rule; |
e114e473 CS |
256 | } |
257 | ||
258 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { | |
259 | case '-': | |
260 | break; | |
261 | case 'w': | |
262 | case 'W': | |
7198e2ee | 263 | rule->smk_access |= MAY_WRITE; |
e114e473 CS |
264 | break; |
265 | default: | |
7198e2ee | 266 | goto out_free_rule; |
e114e473 CS |
267 | } |
268 | ||
269 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { | |
270 | case '-': | |
271 | break; | |
272 | case 'x': | |
273 | case 'X': | |
7198e2ee | 274 | rule->smk_access |= MAY_EXEC; |
e114e473 CS |
275 | break; |
276 | default: | |
7198e2ee | 277 | goto out_free_rule; |
e114e473 CS |
278 | } |
279 | ||
280 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { | |
281 | case '-': | |
282 | break; | |
283 | case 'a': | |
284 | case 'A': | |
7198e2ee | 285 | rule->smk_access |= MAY_APPEND; |
e114e473 CS |
286 | break; |
287 | default: | |
7198e2ee | 288 | goto out_free_rule; |
e114e473 CS |
289 | } |
290 | ||
5c6d1125 JS |
291 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 4]) { |
292 | case '-': | |
293 | break; | |
294 | case 't': | |
295 | case 'T': | |
296 | rule->smk_access |= MAY_TRANSMUTE; | |
297 | break; | |
298 | default: | |
299 | goto out_free_rule; | |
300 | } | |
301 | ||
7898e1f8 CS |
302 | rc = count; |
303 | /* | |
304 | * smk_set_access returns true if there was already a rule | |
305 | * for the subject/object pair, and false if it was new. | |
306 | */ | |
307 | if (!smk_set_access(rule, rule_list, rule_lock)) | |
308 | goto out; | |
e114e473 | 309 | |
7198e2ee EB |
310 | out_free_rule: |
311 | kfree(rule); | |
e114e473 CS |
312 | out: |
313 | kfree(data); | |
314 | return rc; | |
315 | } | |
316 | ||
7898e1f8 CS |
317 | |
318 | /* | |
319 | * Seq_file read operations for /smack/load | |
320 | */ | |
321 | ||
322 | static void *load_seq_start(struct seq_file *s, loff_t *pos) | |
323 | { | |
324 | if (*pos == SEQ_READ_FINISHED) | |
325 | return NULL; | |
326 | if (list_empty(&smack_rule_list)) | |
327 | return NULL; | |
328 | return smack_rule_list.next; | |
329 | } | |
330 | ||
331 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
332 | { | |
333 | struct list_head *list = v; | |
334 | ||
335 | if (list_is_last(list, &smack_rule_list)) { | |
336 | *pos = SEQ_READ_FINISHED; | |
337 | return NULL; | |
338 | } | |
339 | return list->next; | |
340 | } | |
341 | ||
342 | static int load_seq_show(struct seq_file *s, void *v) | |
343 | { | |
344 | struct list_head *list = v; | |
345 | struct smack_rule *srp = | |
346 | list_entry(list, struct smack_rule, list); | |
347 | ||
348 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
349 | (char *)srp->smk_object); | |
350 | ||
351 | seq_putc(s, ' '); | |
352 | ||
353 | if (srp->smk_access & MAY_READ) | |
354 | seq_putc(s, 'r'); | |
355 | if (srp->smk_access & MAY_WRITE) | |
356 | seq_putc(s, 'w'); | |
357 | if (srp->smk_access & MAY_EXEC) | |
358 | seq_putc(s, 'x'); | |
359 | if (srp->smk_access & MAY_APPEND) | |
360 | seq_putc(s, 'a'); | |
361 | if (srp->smk_access & MAY_TRANSMUTE) | |
362 | seq_putc(s, 't'); | |
363 | if (srp->smk_access == 0) | |
364 | seq_putc(s, '-'); | |
365 | ||
366 | seq_putc(s, '\n'); | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | static void load_seq_stop(struct seq_file *s, void *v) | |
372 | { | |
373 | /* No-op */ | |
374 | } | |
375 | ||
376 | static const struct seq_operations load_seq_ops = { | |
377 | .start = load_seq_start, | |
378 | .next = load_seq_next, | |
379 | .show = load_seq_show, | |
380 | .stop = load_seq_stop, | |
381 | }; | |
382 | ||
383 | /** | |
384 | * smk_open_load - open() for /smack/load | |
385 | * @inode: inode structure representing file | |
386 | * @file: "load" file pointer | |
387 | * | |
388 | * For reading, use load_seq_* seq_file reading operations. | |
389 | */ | |
390 | static int smk_open_load(struct inode *inode, struct file *file) | |
391 | { | |
392 | return seq_open(file, &load_seq_ops); | |
393 | } | |
394 | ||
395 | /** | |
396 | * smk_write_load - write() for /smack/load | |
397 | * @file: file pointer, not actually used | |
398 | * @buf: where to get the data from | |
399 | * @count: bytes sent | |
400 | * @ppos: where to start - must be 0 | |
401 | * | |
402 | */ | |
403 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
404 | size_t count, loff_t *ppos) | |
405 | { | |
406 | ||
407 | /* | |
408 | * Must have privilege. | |
409 | * No partial writes. | |
410 | * Enough data must be present. | |
411 | */ | |
412 | if (!capable(CAP_MAC_ADMIN)) | |
413 | return -EPERM; | |
414 | ||
415 | return smk_write_load_list(file, buf, count, ppos, &smack_rule_list, | |
416 | &smack_list_lock); | |
417 | } | |
418 | ||
e114e473 CS |
419 | static const struct file_operations smk_load_ops = { |
420 | .open = smk_open_load, | |
421 | .read = seq_read, | |
422 | .llseek = seq_lseek, | |
423 | .write = smk_write_load, | |
cb622bbb | 424 | .release = seq_release, |
e114e473 CS |
425 | }; |
426 | ||
427 | /** | |
428 | * smk_cipso_doi - initialize the CIPSO domain | |
429 | */ | |
30aa4faf | 430 | static void smk_cipso_doi(void) |
e114e473 CS |
431 | { |
432 | int rc; | |
433 | struct cipso_v4_doi *doip; | |
6d3dc07c | 434 | struct netlbl_audit nai; |
e114e473 | 435 | |
6d3dc07c | 436 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 437 | |
6d3dc07c | 438 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
439 | if (rc != 0) |
440 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
441 | __func__, __LINE__, rc); | |
442 | ||
443 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
444 | if (doip == NULL) | |
445 | panic("smack: Failed to initialize cipso DOI.\n"); | |
446 | doip->map.std = NULL; | |
447 | doip->doi = smk_cipso_doi_value; | |
448 | doip->type = CIPSO_V4_MAP_PASS; | |
449 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
450 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
451 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
452 | ||
6d3dc07c | 453 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 454 | if (rc != 0) { |
6c2e8ac0 PM |
455 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
456 | __func__, __LINE__, rc); | |
457 | kfree(doip); | |
458 | return; | |
459 | } | |
6d3dc07c | 460 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
461 | if (rc != 0) { |
462 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 463 | __func__, __LINE__, rc); |
b1edeb10 | 464 | kfree(doip); |
6c2e8ac0 | 465 | return; |
b1edeb10 | 466 | } |
e114e473 CS |
467 | } |
468 | ||
4bc87e62 CS |
469 | /** |
470 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 471 | * @oldambient: previous domain string |
4bc87e62 | 472 | */ |
30aa4faf | 473 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
474 | { |
475 | int rc; | |
6d3dc07c | 476 | struct netlbl_audit nai; |
4bc87e62 | 477 | |
6d3dc07c | 478 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
479 | |
480 | if (oldambient != NULL) { | |
6d3dc07c | 481 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
482 | if (rc != 0) |
483 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
484 | __func__, __LINE__, rc); | |
485 | } | |
486 | ||
6d3dc07c CS |
487 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET, |
488 | NULL, NULL, &nai); | |
4bc87e62 CS |
489 | if (rc != 0) |
490 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
491 | __func__, __LINE__, rc); | |
492 | } | |
493 | ||
e114e473 CS |
494 | /* |
495 | * Seq_file read operations for /smack/cipso | |
496 | */ | |
497 | ||
498 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
499 | { | |
500 | if (*pos == SEQ_READ_FINISHED) | |
501 | return NULL; | |
7198e2ee EB |
502 | if (list_empty(&smack_known_list)) |
503 | return NULL; | |
e114e473 | 504 | |
7198e2ee | 505 | return smack_known_list.next; |
e114e473 CS |
506 | } |
507 | ||
508 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
509 | { | |
7198e2ee | 510 | struct list_head *list = v; |
e114e473 CS |
511 | |
512 | /* | |
7198e2ee EB |
513 | * labels with no associated cipso value wont be printed |
514 | * in cipso_seq_show | |
e114e473 | 515 | */ |
7198e2ee | 516 | if (list_is_last(list, &smack_known_list)) { |
e114e473 | 517 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
518 | return NULL; |
519 | } | |
e114e473 | 520 | |
7198e2ee | 521 | return list->next; |
e114e473 CS |
522 | } |
523 | ||
524 | /* | |
525 | * Print cipso labels in format: | |
526 | * label level[/cat[,cat]] | |
527 | */ | |
528 | static int cipso_seq_show(struct seq_file *s, void *v) | |
529 | { | |
7198e2ee EB |
530 | struct list_head *list = v; |
531 | struct smack_known *skp = | |
532 | list_entry(list, struct smack_known, list); | |
e114e473 CS |
533 | struct smack_cipso *scp = skp->smk_cipso; |
534 | char *cbp; | |
535 | char sep = '/'; | |
536 | int cat = 1; | |
537 | int i; | |
538 | unsigned char m; | |
539 | ||
540 | if (scp == NULL) | |
541 | return 0; | |
542 | ||
543 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); | |
544 | ||
545 | cbp = scp->smk_catset; | |
546 | for (i = 0; i < SMK_LABELLEN; i++) | |
547 | for (m = 0x80; m != 0; m >>= 1) { | |
548 | if (m & cbp[i]) { | |
549 | seq_printf(s, "%c%d", sep, cat); | |
550 | sep = ','; | |
551 | } | |
552 | cat++; | |
553 | } | |
554 | ||
555 | seq_putc(s, '\n'); | |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
560 | static void cipso_seq_stop(struct seq_file *s, void *v) | |
561 | { | |
562 | /* No-op */ | |
563 | } | |
564 | ||
88e9d34c | 565 | static const struct seq_operations cipso_seq_ops = { |
e114e473 CS |
566 | .start = cipso_seq_start, |
567 | .stop = cipso_seq_stop, | |
568 | .next = cipso_seq_next, | |
569 | .show = cipso_seq_show, | |
570 | }; | |
571 | ||
572 | /** | |
573 | * smk_open_cipso - open() for /smack/cipso | |
574 | * @inode: inode structure representing file | |
575 | * @file: "cipso" file pointer | |
576 | * | |
577 | * Connect our cipso_seq_* operations with /smack/cipso | |
578 | * file_operations | |
579 | */ | |
580 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
581 | { | |
582 | return seq_open(file, &cipso_seq_ops); | |
583 | } | |
584 | ||
585 | /** | |
586 | * smk_write_cipso - write() for /smack/cipso | |
251a2a95 | 587 | * @file: file pointer, not actually used |
e114e473 CS |
588 | * @buf: where to get the data from |
589 | * @count: bytes sent | |
590 | * @ppos: where to start | |
591 | * | |
592 | * Accepts only one cipso rule per write call. | |
593 | * Returns number of bytes written or error code, as appropriate | |
594 | */ | |
595 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
596 | size_t count, loff_t *ppos) | |
597 | { | |
598 | struct smack_known *skp; | |
599 | struct smack_cipso *scp = NULL; | |
600 | char mapcatset[SMK_LABELLEN]; | |
601 | int maplevel; | |
602 | int cat; | |
603 | int catlen; | |
604 | ssize_t rc = -EINVAL; | |
605 | char *data = NULL; | |
606 | char *rule; | |
607 | int ret; | |
608 | int i; | |
609 | ||
610 | /* | |
611 | * Must have privilege. | |
612 | * No partial writes. | |
613 | * Enough data must be present. | |
614 | */ | |
615 | if (!capable(CAP_MAC_ADMIN)) | |
616 | return -EPERM; | |
617 | if (*ppos != 0) | |
618 | return -EINVAL; | |
b500ce8d | 619 | if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) |
e114e473 CS |
620 | return -EINVAL; |
621 | ||
622 | data = kzalloc(count + 1, GFP_KERNEL); | |
623 | if (data == NULL) | |
624 | return -ENOMEM; | |
625 | ||
626 | if (copy_from_user(data, buf, count) != 0) { | |
627 | rc = -EFAULT; | |
628 | goto unlockedout; | |
629 | } | |
630 | ||
4303154e EB |
631 | /* labels cannot begin with a '-' */ |
632 | if (data[0] == '-') { | |
633 | rc = -EINVAL; | |
634 | goto unlockedout; | |
635 | } | |
e114e473 CS |
636 | data[count] = '\0'; |
637 | rule = data; | |
638 | /* | |
639 | * Only allow one writer at a time. Writes should be | |
640 | * quite rare and small in any case. | |
641 | */ | |
642 | mutex_lock(&smack_cipso_lock); | |
643 | ||
644 | skp = smk_import_entry(rule, 0); | |
645 | if (skp == NULL) | |
646 | goto out; | |
647 | ||
c19a28e1 | 648 | rule += SMK_LABELLEN; |
e114e473 CS |
649 | ret = sscanf(rule, "%d", &maplevel); |
650 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
651 | goto out; | |
652 | ||
653 | rule += SMK_DIGITLEN; | |
654 | ret = sscanf(rule, "%d", &catlen); | |
655 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
656 | goto out; | |
657 | ||
b500ce8d | 658 | if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
e114e473 CS |
659 | goto out; |
660 | ||
661 | memset(mapcatset, 0, sizeof(mapcatset)); | |
662 | ||
663 | for (i = 0; i < catlen; i++) { | |
664 | rule += SMK_DIGITLEN; | |
665 | ret = sscanf(rule, "%d", &cat); | |
666 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) | |
667 | goto out; | |
668 | ||
669 | smack_catset_bit(cat, mapcatset); | |
670 | } | |
671 | ||
672 | if (skp->smk_cipso == NULL) { | |
673 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); | |
674 | if (scp == NULL) { | |
675 | rc = -ENOMEM; | |
676 | goto out; | |
677 | } | |
678 | } | |
679 | ||
680 | spin_lock_bh(&skp->smk_cipsolock); | |
681 | ||
682 | if (scp == NULL) | |
683 | scp = skp->smk_cipso; | |
684 | else | |
685 | skp->smk_cipso = scp; | |
686 | ||
687 | scp->smk_level = maplevel; | |
688 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); | |
689 | ||
690 | spin_unlock_bh(&skp->smk_cipsolock); | |
691 | ||
692 | rc = count; | |
693 | out: | |
694 | mutex_unlock(&smack_cipso_lock); | |
695 | unlockedout: | |
696 | kfree(data); | |
697 | return rc; | |
698 | } | |
699 | ||
700 | static const struct file_operations smk_cipso_ops = { | |
701 | .open = smk_open_cipso, | |
702 | .read = seq_read, | |
703 | .llseek = seq_lseek, | |
704 | .write = smk_write_cipso, | |
705 | .release = seq_release, | |
706 | }; | |
707 | ||
6d3dc07c CS |
708 | /* |
709 | * Seq_file read operations for /smack/netlabel | |
710 | */ | |
711 | ||
712 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) | |
713 | { | |
714 | if (*pos == SEQ_READ_FINISHED) | |
715 | return NULL; | |
7198e2ee EB |
716 | if (list_empty(&smk_netlbladdr_list)) |
717 | return NULL; | |
718 | return smk_netlbladdr_list.next; | |
6d3dc07c CS |
719 | } |
720 | ||
721 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
722 | { | |
7198e2ee | 723 | struct list_head *list = v; |
6d3dc07c | 724 | |
7198e2ee | 725 | if (list_is_last(list, &smk_netlbladdr_list)) { |
6d3dc07c | 726 | *pos = SEQ_READ_FINISHED; |
7198e2ee EB |
727 | return NULL; |
728 | } | |
6d3dc07c | 729 | |
7198e2ee | 730 | return list->next; |
6d3dc07c | 731 | } |
6d3dc07c CS |
732 | #define BEBITS (sizeof(__be32) * 8) |
733 | ||
734 | /* | |
735 | * Print host/label pairs | |
736 | */ | |
737 | static int netlbladdr_seq_show(struct seq_file *s, void *v) | |
738 | { | |
7198e2ee EB |
739 | struct list_head *list = v; |
740 | struct smk_netlbladdr *skp = | |
741 | list_entry(list, struct smk_netlbladdr, list); | |
6d3dc07c | 742 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
113a0e45 | 743 | int maskn; |
744 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); | |
6d3dc07c | 745 | |
113a0e45 | 746 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
6d3dc07c CS |
747 | |
748 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", | |
749 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); | |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
754 | static void netlbladdr_seq_stop(struct seq_file *s, void *v) | |
755 | { | |
756 | /* No-op */ | |
757 | } | |
758 | ||
88e9d34c | 759 | static const struct seq_operations netlbladdr_seq_ops = { |
6d3dc07c CS |
760 | .start = netlbladdr_seq_start, |
761 | .stop = netlbladdr_seq_stop, | |
762 | .next = netlbladdr_seq_next, | |
763 | .show = netlbladdr_seq_show, | |
764 | }; | |
765 | ||
766 | /** | |
767 | * smk_open_netlbladdr - open() for /smack/netlabel | |
768 | * @inode: inode structure representing file | |
769 | * @file: "netlabel" file pointer | |
770 | * | |
771 | * Connect our netlbladdr_seq_* operations with /smack/netlabel | |
772 | * file_operations | |
773 | */ | |
774 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) | |
775 | { | |
776 | return seq_open(file, &netlbladdr_seq_ops); | |
777 | } | |
778 | ||
113a0e45 | 779 | /** |
780 | * smk_netlbladdr_insert | |
781 | * @new : netlabel to insert | |
782 | * | |
783 | * This helper insert netlabel in the smack_netlbladdrs list | |
784 | * sorted by netmask length (longest to smallest) | |
7198e2ee EB |
785 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
786 | * | |
113a0e45 | 787 | */ |
788 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) | |
789 | { | |
7198e2ee | 790 | struct smk_netlbladdr *m, *m_next; |
113a0e45 | 791 | |
7198e2ee EB |
792 | if (list_empty(&smk_netlbladdr_list)) { |
793 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 794 | return; |
795 | } | |
796 | ||
05725f7e JP |
797 | m = list_entry_rcu(smk_netlbladdr_list.next, |
798 | struct smk_netlbladdr, list); | |
7198e2ee | 799 | |
113a0e45 | 800 | /* the comparison '>' is a bit hacky, but works */ |
7198e2ee EB |
801 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
802 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 803 | return; |
804 | } | |
7198e2ee EB |
805 | |
806 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { | |
807 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { | |
808 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 809 | return; |
810 | } | |
05725f7e JP |
811 | m_next = list_entry_rcu(m->list.next, |
812 | struct smk_netlbladdr, list); | |
7198e2ee EB |
813 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { |
814 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 815 | return; |
816 | } | |
817 | } | |
818 | } | |
819 | ||
820 | ||
6d3dc07c CS |
821 | /** |
822 | * smk_write_netlbladdr - write() for /smack/netlabel | |
251a2a95 | 823 | * @file: file pointer, not actually used |
6d3dc07c CS |
824 | * @buf: where to get the data from |
825 | * @count: bytes sent | |
826 | * @ppos: where to start | |
827 | * | |
828 | * Accepts only one netlbladdr per write call. | |
829 | * Returns number of bytes written or error code, as appropriate | |
830 | */ | |
831 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, | |
832 | size_t count, loff_t *ppos) | |
833 | { | |
834 | struct smk_netlbladdr *skp; | |
835 | struct sockaddr_in newname; | |
836 | char smack[SMK_LABELLEN]; | |
837 | char *sp; | |
6470c077 | 838 | char data[SMK_NETLBLADDRMAX + 1]; |
6d3dc07c CS |
839 | char *host = (char *)&newname.sin_addr.s_addr; |
840 | int rc; | |
841 | struct netlbl_audit audit_info; | |
842 | struct in_addr mask; | |
843 | unsigned int m; | |
7198e2ee | 844 | int found; |
113a0e45 | 845 | u32 mask_bits = (1<<31); |
6d3dc07c | 846 | __be32 nsa; |
113a0e45 | 847 | u32 temp_mask; |
6d3dc07c CS |
848 | |
849 | /* | |
850 | * Must have privilege. | |
851 | * No partial writes. | |
852 | * Enough data must be present. | |
853 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
854 | * "<addr, as a.b.c.d><space><label>" | |
855 | */ | |
856 | if (!capable(CAP_MAC_ADMIN)) | |
857 | return -EPERM; | |
858 | if (*ppos != 0) | |
859 | return -EINVAL; | |
860 | if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX) | |
861 | return -EINVAL; | |
862 | if (copy_from_user(data, buf, count) != 0) | |
863 | return -EFAULT; | |
864 | ||
865 | data[count] = '\0'; | |
866 | ||
867 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", | |
868 | &host[0], &host[1], &host[2], &host[3], &m, smack); | |
869 | if (rc != 6) { | |
870 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
871 | &host[0], &host[1], &host[2], &host[3], smack); | |
872 | if (rc != 5) | |
873 | return -EINVAL; | |
874 | m = BEBITS; | |
875 | } | |
876 | if (m > BEBITS) | |
877 | return -EINVAL; | |
878 | ||
4303154e EB |
879 | /* if smack begins with '-', its an option, don't import it */ |
880 | if (smack[0] != '-') { | |
881 | sp = smk_import(smack, 0); | |
882 | if (sp == NULL) | |
883 | return -EINVAL; | |
884 | } else { | |
885 | /* check known options */ | |
886 | if (strcmp(smack, smack_cipso_option) == 0) | |
887 | sp = (char *)smack_cipso_option; | |
888 | else | |
889 | return -EINVAL; | |
890 | } | |
6d3dc07c | 891 | |
113a0e45 | 892 | for (temp_mask = 0; m > 0; m--) { |
893 | temp_mask |= mask_bits; | |
894 | mask_bits >>= 1; | |
6d3dc07c | 895 | } |
113a0e45 | 896 | mask.s_addr = cpu_to_be32(temp_mask); |
897 | ||
898 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
899 | /* |
900 | * Only allow one writer at a time. Writes should be | |
901 | * quite rare and small in any case. | |
902 | */ | |
903 | mutex_lock(&smk_netlbladdr_lock); | |
904 | ||
905 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 906 | /* try to find if the prefix is already in the list */ |
7198e2ee EB |
907 | found = 0; |
908 | list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { | |
6d3dc07c | 909 | if (skp->smk_host.sin_addr.s_addr == nsa && |
7198e2ee EB |
910 | skp->smk_mask.s_addr == mask.s_addr) { |
911 | found = 1; | |
6d3dc07c | 912 | break; |
7198e2ee EB |
913 | } |
914 | } | |
6d3dc07c CS |
915 | smk_netlabel_audit_set(&audit_info); |
916 | ||
7198e2ee | 917 | if (found == 0) { |
6d3dc07c CS |
918 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
919 | if (skp == NULL) | |
920 | rc = -ENOMEM; | |
921 | else { | |
922 | rc = 0; | |
923 | skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; | |
924 | skp->smk_mask.s_addr = mask.s_addr; | |
6d3dc07c | 925 | skp->smk_label = sp; |
113a0e45 | 926 | smk_netlbladdr_insert(skp); |
6d3dc07c CS |
927 | } |
928 | } else { | |
4303154e | 929 | /* we delete the unlabeled entry, only if the previous label |
25985edc | 930 | * wasn't the special CIPSO option */ |
4303154e EB |
931 | if (skp->smk_label != smack_cipso_option) |
932 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, | |
933 | &skp->smk_host.sin_addr, &skp->smk_mask, | |
934 | PF_INET, &audit_info); | |
935 | else | |
936 | rc = 0; | |
6d3dc07c CS |
937 | skp->smk_label = sp; |
938 | } | |
939 | ||
940 | /* | |
941 | * Now tell netlabel about the single label nature of | |
942 | * this host so that incoming packets get labeled. | |
4303154e | 943 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 944 | */ |
4303154e | 945 | if (rc == 0 && sp != smack_cipso_option) |
6d3dc07c CS |
946 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
947 | &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, | |
948 | smack_to_secid(skp->smk_label), &audit_info); | |
949 | ||
950 | if (rc == 0) | |
951 | rc = count; | |
952 | ||
953 | mutex_unlock(&smk_netlbladdr_lock); | |
954 | ||
955 | return rc; | |
956 | } | |
957 | ||
958 | static const struct file_operations smk_netlbladdr_ops = { | |
959 | .open = smk_open_netlbladdr, | |
960 | .read = seq_read, | |
961 | .llseek = seq_lseek, | |
962 | .write = smk_write_netlbladdr, | |
963 | .release = seq_release, | |
964 | }; | |
965 | ||
e114e473 CS |
966 | /** |
967 | * smk_read_doi - read() for /smack/doi | |
968 | * @filp: file pointer, not actually used | |
969 | * @buf: where to put the result | |
970 | * @count: maximum to send along | |
971 | * @ppos: where to start | |
972 | * | |
973 | * Returns number of bytes read or error code, as appropriate | |
974 | */ | |
975 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
976 | size_t count, loff_t *ppos) | |
977 | { | |
978 | char temp[80]; | |
979 | ssize_t rc; | |
980 | ||
981 | if (*ppos != 0) | |
982 | return 0; | |
983 | ||
984 | sprintf(temp, "%d", smk_cipso_doi_value); | |
985 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
986 | ||
987 | return rc; | |
988 | } | |
989 | ||
990 | /** | |
991 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 992 | * @file: file pointer, not actually used |
e114e473 CS |
993 | * @buf: where to get the data from |
994 | * @count: bytes sent | |
995 | * @ppos: where to start | |
996 | * | |
997 | * Returns number of bytes written or error code, as appropriate | |
998 | */ | |
999 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1000 | size_t count, loff_t *ppos) | |
1001 | { | |
1002 | char temp[80]; | |
1003 | int i; | |
1004 | ||
1005 | if (!capable(CAP_MAC_ADMIN)) | |
1006 | return -EPERM; | |
1007 | ||
1008 | if (count >= sizeof(temp) || count == 0) | |
1009 | return -EINVAL; | |
1010 | ||
1011 | if (copy_from_user(temp, buf, count) != 0) | |
1012 | return -EFAULT; | |
1013 | ||
1014 | temp[count] = '\0'; | |
1015 | ||
1016 | if (sscanf(temp, "%d", &i) != 1) | |
1017 | return -EINVAL; | |
1018 | ||
1019 | smk_cipso_doi_value = i; | |
1020 | ||
1021 | smk_cipso_doi(); | |
1022 | ||
1023 | return count; | |
1024 | } | |
1025 | ||
1026 | static const struct file_operations smk_doi_ops = { | |
1027 | .read = smk_read_doi, | |
1028 | .write = smk_write_doi, | |
6038f373 | 1029 | .llseek = default_llseek, |
e114e473 CS |
1030 | }; |
1031 | ||
1032 | /** | |
1033 | * smk_read_direct - read() for /smack/direct | |
1034 | * @filp: file pointer, not actually used | |
1035 | * @buf: where to put the result | |
1036 | * @count: maximum to send along | |
1037 | * @ppos: where to start | |
1038 | * | |
1039 | * Returns number of bytes read or error code, as appropriate | |
1040 | */ | |
1041 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1042 | size_t count, loff_t *ppos) | |
1043 | { | |
1044 | char temp[80]; | |
1045 | ssize_t rc; | |
1046 | ||
1047 | if (*ppos != 0) | |
1048 | return 0; | |
1049 | ||
1050 | sprintf(temp, "%d", smack_cipso_direct); | |
1051 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1052 | ||
1053 | return rc; | |
1054 | } | |
1055 | ||
1056 | /** | |
1057 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1058 | * @file: file pointer, not actually used |
e114e473 CS |
1059 | * @buf: where to get the data from |
1060 | * @count: bytes sent | |
1061 | * @ppos: where to start | |
1062 | * | |
1063 | * Returns number of bytes written or error code, as appropriate | |
1064 | */ | |
1065 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1066 | size_t count, loff_t *ppos) | |
1067 | { | |
1068 | char temp[80]; | |
1069 | int i; | |
1070 | ||
1071 | if (!capable(CAP_MAC_ADMIN)) | |
1072 | return -EPERM; | |
1073 | ||
1074 | if (count >= sizeof(temp) || count == 0) | |
1075 | return -EINVAL; | |
1076 | ||
1077 | if (copy_from_user(temp, buf, count) != 0) | |
1078 | return -EFAULT; | |
1079 | ||
1080 | temp[count] = '\0'; | |
1081 | ||
1082 | if (sscanf(temp, "%d", &i) != 1) | |
1083 | return -EINVAL; | |
1084 | ||
1085 | smack_cipso_direct = i; | |
1086 | ||
1087 | return count; | |
1088 | } | |
1089 | ||
1090 | static const struct file_operations smk_direct_ops = { | |
1091 | .read = smk_read_direct, | |
1092 | .write = smk_write_direct, | |
6038f373 | 1093 | .llseek = default_llseek, |
e114e473 CS |
1094 | }; |
1095 | ||
1096 | /** | |
1097 | * smk_read_ambient - read() for /smack/ambient | |
1098 | * @filp: file pointer, not actually used | |
1099 | * @buf: where to put the result | |
1100 | * @cn: maximum to send along | |
1101 | * @ppos: where to start | |
1102 | * | |
1103 | * Returns number of bytes read or error code, as appropriate | |
1104 | */ | |
1105 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1106 | size_t cn, loff_t *ppos) | |
1107 | { | |
1108 | ssize_t rc; | |
e114e473 CS |
1109 | int asize; |
1110 | ||
1111 | if (*ppos != 0) | |
1112 | return 0; | |
1113 | /* | |
1114 | * Being careful to avoid a problem in the case where | |
1115 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1116 | */ |
4bc87e62 | 1117 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1118 | |
4bc87e62 CS |
1119 | asize = strlen(smack_net_ambient) + 1; |
1120 | ||
1121 | if (cn >= asize) | |
1122 | rc = simple_read_from_buffer(buf, cn, ppos, | |
1123 | smack_net_ambient, asize); | |
1124 | else | |
1125 | rc = -EINVAL; | |
e114e473 | 1126 | |
4bc87e62 | 1127 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1128 | |
1129 | return rc; | |
1130 | } | |
1131 | ||
1132 | /** | |
1133 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1134 | * @file: file pointer, not actually used |
e114e473 CS |
1135 | * @buf: where to get the data from |
1136 | * @count: bytes sent | |
1137 | * @ppos: where to start | |
1138 | * | |
1139 | * Returns number of bytes written or error code, as appropriate | |
1140 | */ | |
1141 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1142 | size_t count, loff_t *ppos) | |
1143 | { | |
1144 | char in[SMK_LABELLEN]; | |
4bc87e62 | 1145 | char *oldambient; |
e114e473 CS |
1146 | char *smack; |
1147 | ||
1148 | if (!capable(CAP_MAC_ADMIN)) | |
1149 | return -EPERM; | |
1150 | ||
1151 | if (count >= SMK_LABELLEN) | |
1152 | return -EINVAL; | |
1153 | ||
1154 | if (copy_from_user(in, buf, count) != 0) | |
1155 | return -EFAULT; | |
1156 | ||
1157 | smack = smk_import(in, count); | |
1158 | if (smack == NULL) | |
1159 | return -EINVAL; | |
1160 | ||
4bc87e62 CS |
1161 | mutex_lock(&smack_ambient_lock); |
1162 | ||
1163 | oldambient = smack_net_ambient; | |
e114e473 | 1164 | smack_net_ambient = smack; |
4bc87e62 CS |
1165 | smk_unlbl_ambient(oldambient); |
1166 | ||
1167 | mutex_unlock(&smack_ambient_lock); | |
e114e473 CS |
1168 | |
1169 | return count; | |
1170 | } | |
1171 | ||
1172 | static const struct file_operations smk_ambient_ops = { | |
1173 | .read = smk_read_ambient, | |
1174 | .write = smk_write_ambient, | |
6038f373 | 1175 | .llseek = default_llseek, |
e114e473 CS |
1176 | }; |
1177 | ||
15446235 CS |
1178 | /** |
1179 | * smk_read_onlycap - read() for /smack/onlycap | |
1180 | * @filp: file pointer, not actually used | |
1181 | * @buf: where to put the result | |
1182 | * @cn: maximum to send along | |
1183 | * @ppos: where to start | |
1184 | * | |
1185 | * Returns number of bytes read or error code, as appropriate | |
1186 | */ | |
1187 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, | |
1188 | size_t cn, loff_t *ppos) | |
1189 | { | |
1190 | char *smack = ""; | |
1191 | ssize_t rc = -EINVAL; | |
1192 | int asize; | |
1193 | ||
1194 | if (*ppos != 0) | |
1195 | return 0; | |
1196 | ||
1197 | if (smack_onlycap != NULL) | |
1198 | smack = smack_onlycap; | |
1199 | ||
1200 | asize = strlen(smack) + 1; | |
1201 | ||
1202 | if (cn >= asize) | |
1203 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
1204 | ||
1205 | return rc; | |
1206 | } | |
1207 | ||
1208 | /** | |
1209 | * smk_write_onlycap - write() for /smack/onlycap | |
251a2a95 | 1210 | * @file: file pointer, not actually used |
15446235 CS |
1211 | * @buf: where to get the data from |
1212 | * @count: bytes sent | |
1213 | * @ppos: where to start | |
1214 | * | |
1215 | * Returns number of bytes written or error code, as appropriate | |
1216 | */ | |
1217 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
1218 | size_t count, loff_t *ppos) | |
1219 | { | |
1220 | char in[SMK_LABELLEN]; | |
676dac4b | 1221 | char *sp = smk_of_task(current->cred->security); |
15446235 CS |
1222 | |
1223 | if (!capable(CAP_MAC_ADMIN)) | |
1224 | return -EPERM; | |
1225 | ||
1226 | /* | |
1227 | * This can be done using smk_access() but is done | |
1228 | * explicitly for clarity. The smk_access() implementation | |
1229 | * would use smk_access(smack_onlycap, MAY_WRITE) | |
1230 | */ | |
1231 | if (smack_onlycap != NULL && smack_onlycap != sp) | |
1232 | return -EPERM; | |
1233 | ||
1234 | if (count >= SMK_LABELLEN) | |
1235 | return -EINVAL; | |
1236 | ||
1237 | if (copy_from_user(in, buf, count) != 0) | |
1238 | return -EFAULT; | |
1239 | ||
1240 | /* | |
1241 | * Should the null string be passed in unset the onlycap value. | |
1242 | * This seems like something to be careful with as usually | |
1243 | * smk_import only expects to return NULL for errors. It | |
1244 | * is usually the case that a nullstring or "\n" would be | |
1245 | * bad to pass to smk_import but in fact this is useful here. | |
1246 | */ | |
1247 | smack_onlycap = smk_import(in, count); | |
1248 | ||
1249 | return count; | |
1250 | } | |
1251 | ||
1252 | static const struct file_operations smk_onlycap_ops = { | |
1253 | .read = smk_read_onlycap, | |
1254 | .write = smk_write_onlycap, | |
6038f373 | 1255 | .llseek = default_llseek, |
15446235 CS |
1256 | }; |
1257 | ||
ecfcc53f EB |
1258 | /** |
1259 | * smk_read_logging - read() for /smack/logging | |
1260 | * @filp: file pointer, not actually used | |
1261 | * @buf: where to put the result | |
1262 | * @cn: maximum to send along | |
1263 | * @ppos: where to start | |
1264 | * | |
1265 | * Returns number of bytes read or error code, as appropriate | |
1266 | */ | |
1267 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
1268 | size_t count, loff_t *ppos) | |
1269 | { | |
1270 | char temp[32]; | |
1271 | ssize_t rc; | |
1272 | ||
1273 | if (*ppos != 0) | |
1274 | return 0; | |
1275 | ||
1276 | sprintf(temp, "%d\n", log_policy); | |
1277 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1278 | return rc; | |
1279 | } | |
1280 | ||
1281 | /** | |
1282 | * smk_write_logging - write() for /smack/logging | |
1283 | * @file: file pointer, not actually used | |
1284 | * @buf: where to get the data from | |
1285 | * @count: bytes sent | |
1286 | * @ppos: where to start | |
1287 | * | |
1288 | * Returns number of bytes written or error code, as appropriate | |
1289 | */ | |
1290 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
1291 | size_t count, loff_t *ppos) | |
1292 | { | |
1293 | char temp[32]; | |
1294 | int i; | |
1295 | ||
1296 | if (!capable(CAP_MAC_ADMIN)) | |
1297 | return -EPERM; | |
1298 | ||
1299 | if (count >= sizeof(temp) || count == 0) | |
1300 | return -EINVAL; | |
1301 | ||
1302 | if (copy_from_user(temp, buf, count) != 0) | |
1303 | return -EFAULT; | |
1304 | ||
1305 | temp[count] = '\0'; | |
1306 | ||
1307 | if (sscanf(temp, "%d", &i) != 1) | |
1308 | return -EINVAL; | |
1309 | if (i < 0 || i > 3) | |
1310 | return -EINVAL; | |
1311 | log_policy = i; | |
1312 | return count; | |
1313 | } | |
1314 | ||
1315 | ||
1316 | ||
1317 | static const struct file_operations smk_logging_ops = { | |
1318 | .read = smk_read_logging, | |
1319 | .write = smk_write_logging, | |
6038f373 | 1320 | .llseek = default_llseek, |
ecfcc53f | 1321 | }; |
7898e1f8 CS |
1322 | |
1323 | /* | |
1324 | * Seq_file read operations for /smack/load-self | |
1325 | */ | |
1326 | ||
1327 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
1328 | { | |
1329 | struct task_smack *tsp = current_security(); | |
1330 | ||
1331 | if (*pos == SEQ_READ_FINISHED) | |
1332 | return NULL; | |
1333 | if (list_empty(&tsp->smk_rules)) | |
1334 | return NULL; | |
1335 | return tsp->smk_rules.next; | |
1336 | } | |
1337 | ||
1338 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1339 | { | |
1340 | struct task_smack *tsp = current_security(); | |
1341 | struct list_head *list = v; | |
1342 | ||
1343 | if (list_is_last(list, &tsp->smk_rules)) { | |
1344 | *pos = SEQ_READ_FINISHED; | |
1345 | return NULL; | |
1346 | } | |
1347 | return list->next; | |
1348 | } | |
1349 | ||
1350 | static int load_self_seq_show(struct seq_file *s, void *v) | |
1351 | { | |
1352 | struct list_head *list = v; | |
1353 | struct smack_rule *srp = | |
1354 | list_entry(list, struct smack_rule, list); | |
1355 | ||
1356 | seq_printf(s, "%s %s", (char *)srp->smk_subject, | |
1357 | (char *)srp->smk_object); | |
1358 | ||
1359 | seq_putc(s, ' '); | |
1360 | ||
1361 | if (srp->smk_access & MAY_READ) | |
1362 | seq_putc(s, 'r'); | |
1363 | if (srp->smk_access & MAY_WRITE) | |
1364 | seq_putc(s, 'w'); | |
1365 | if (srp->smk_access & MAY_EXEC) | |
1366 | seq_putc(s, 'x'); | |
1367 | if (srp->smk_access & MAY_APPEND) | |
1368 | seq_putc(s, 'a'); | |
1369 | if (srp->smk_access & MAY_TRANSMUTE) | |
1370 | seq_putc(s, 't'); | |
1371 | if (srp->smk_access == 0) | |
1372 | seq_putc(s, '-'); | |
1373 | ||
1374 | seq_putc(s, '\n'); | |
1375 | ||
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | static void load_self_seq_stop(struct seq_file *s, void *v) | |
1380 | { | |
1381 | /* No-op */ | |
1382 | } | |
1383 | ||
1384 | static const struct seq_operations load_self_seq_ops = { | |
1385 | .start = load_self_seq_start, | |
1386 | .next = load_self_seq_next, | |
1387 | .show = load_self_seq_show, | |
1388 | .stop = load_self_seq_stop, | |
1389 | }; | |
1390 | ||
1391 | ||
1392 | /** | |
1393 | * smk_open_load_self - open() for /smack/load-self | |
1394 | * @inode: inode structure representing file | |
1395 | * @file: "load" file pointer | |
1396 | * | |
1397 | * For reading, use load_seq_* seq_file reading operations. | |
1398 | */ | |
1399 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
1400 | { | |
1401 | return seq_open(file, &load_self_seq_ops); | |
1402 | } | |
1403 | ||
1404 | /** | |
1405 | * smk_write_load_self - write() for /smack/load-self | |
1406 | * @file: file pointer, not actually used | |
1407 | * @buf: where to get the data from | |
1408 | * @count: bytes sent | |
1409 | * @ppos: where to start - must be 0 | |
1410 | * | |
1411 | */ | |
1412 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
1413 | size_t count, loff_t *ppos) | |
1414 | { | |
1415 | struct task_smack *tsp = current_security(); | |
1416 | ||
1417 | return smk_write_load_list(file, buf, count, ppos, &tsp->smk_rules, | |
1418 | &tsp->smk_rules_lock); | |
1419 | } | |
1420 | ||
1421 | static const struct file_operations smk_load_self_ops = { | |
1422 | .open = smk_open_load_self, | |
1423 | .read = seq_read, | |
1424 | .llseek = seq_lseek, | |
1425 | .write = smk_write_load_self, | |
1426 | .release = seq_release, | |
1427 | }; | |
e114e473 CS |
1428 | /** |
1429 | * smk_fill_super - fill the /smackfs superblock | |
1430 | * @sb: the empty superblock | |
1431 | * @data: unused | |
1432 | * @silent: unused | |
1433 | * | |
1434 | * Fill in the well known entries for /smack | |
1435 | * | |
1436 | * Returns 0 on success, an error code on failure | |
1437 | */ | |
1438 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
1439 | { | |
1440 | int rc; | |
1441 | struct inode *root_inode; | |
1442 | ||
1443 | static struct tree_descr smack_files[] = { | |
7898e1f8 CS |
1444 | [SMK_LOAD] = { |
1445 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
1446 | [SMK_CIPSO] = { | |
1447 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
1448 | [SMK_DOI] = { | |
1449 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
1450 | [SMK_DIRECT] = { | |
1451 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
1452 | [SMK_AMBIENT] = { | |
1453 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
1454 | [SMK_NETLBLADDR] = { | |
1455 | "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, | |
1456 | [SMK_ONLYCAP] = { | |
1457 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
1458 | [SMK_LOGGING] = { | |
1459 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
1460 | [SMK_LOAD_SELF] = { | |
1461 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
1462 | /* last one */ | |
1463 | {""} | |
e114e473 CS |
1464 | }; |
1465 | ||
1466 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
1467 | if (rc != 0) { | |
1468 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
1469 | __func__, rc); | |
1470 | return rc; | |
1471 | } | |
1472 | ||
1473 | root_inode = sb->s_root->d_inode; | |
1474 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); | |
1475 | ||
1476 | return 0; | |
1477 | } | |
1478 | ||
1479 | /** | |
fc14f2fe | 1480 | * smk_mount - get the smackfs superblock |
e114e473 CS |
1481 | * @fs_type: passed along without comment |
1482 | * @flags: passed along without comment | |
1483 | * @dev_name: passed along without comment | |
1484 | * @data: passed along without comment | |
e114e473 CS |
1485 | * |
1486 | * Just passes everything along. | |
1487 | * | |
1488 | * Returns what the lower level code does. | |
1489 | */ | |
fc14f2fe AV |
1490 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
1491 | int flags, const char *dev_name, void *data) | |
e114e473 | 1492 | { |
fc14f2fe | 1493 | return mount_single(fs_type, flags, data, smk_fill_super); |
e114e473 CS |
1494 | } |
1495 | ||
1496 | static struct file_system_type smk_fs_type = { | |
1497 | .name = "smackfs", | |
fc14f2fe | 1498 | .mount = smk_mount, |
e114e473 CS |
1499 | .kill_sb = kill_litter_super, |
1500 | }; | |
1501 | ||
1502 | static struct vfsmount *smackfs_mount; | |
1503 | ||
1504 | /** | |
1505 | * init_smk_fs - get the smackfs superblock | |
1506 | * | |
1507 | * register the smackfs | |
1508 | * | |
076c54c5 AD |
1509 | * Do not register smackfs if Smack wasn't enabled |
1510 | * on boot. We can not put this method normally under the | |
1511 | * smack_init() code path since the security subsystem get | |
1512 | * initialized before the vfs caches. | |
1513 | * | |
1514 | * Returns true if we were not chosen on boot or if | |
1515 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
1516 | */ |
1517 | static int __init init_smk_fs(void) | |
1518 | { | |
1519 | int err; | |
1520 | ||
076c54c5 AD |
1521 | if (!security_module_enable(&smack_ops)) |
1522 | return 0; | |
1523 | ||
e114e473 CS |
1524 | err = register_filesystem(&smk_fs_type); |
1525 | if (!err) { | |
1526 | smackfs_mount = kern_mount(&smk_fs_type); | |
1527 | if (IS_ERR(smackfs_mount)) { | |
1528 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
1529 | err = PTR_ERR(smackfs_mount); | |
1530 | smackfs_mount = NULL; | |
1531 | } | |
1532 | } | |
1533 | ||
e114e473 | 1534 | smk_cipso_doi(); |
4bc87e62 | 1535 | smk_unlbl_ambient(NULL); |
e114e473 CS |
1536 | |
1537 | return err; | |
1538 | } | |
1539 | ||
1540 | __initcall(init_smk_fs); |