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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/cipso_ipv4.h> |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/ctype.h> | |
4bc87e62 | 28 | #include <linux/audit.h> |
e114e473 CS |
29 | #include "smack.h" |
30 | ||
31 | /* | |
32 | * smackfs pseudo filesystem. | |
33 | */ | |
34 | ||
35 | enum smk_inos { | |
36 | SMK_ROOT_INO = 2, | |
37 | SMK_LOAD = 3, /* load policy */ | |
38 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ | |
39 | SMK_DOI = 5, /* CIPSO DOI */ | |
40 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ | |
41 | SMK_AMBIENT = 7, /* internet ambient label */ | |
6d3dc07c | 42 | SMK_NETLBLADDR = 8, /* single label hosts */ |
15446235 | 43 | SMK_ONLYCAP = 9, /* the only "capable" label */ |
ecfcc53f | 44 | SMK_LOGGING = 10, /* logging */ |
7898e1f8 | 45 | SMK_LOAD_SELF = 11, /* task specific rules */ |
828716c2 | 46 | SMK_ACCESSES = 12, /* access policy */ |
f7112e6c CS |
47 | SMK_MAPPED = 13, /* CIPSO level indicating mapped label */ |
48 | SMK_LOAD2 = 14, /* load policy with long labels */ | |
49 | SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */ | |
50 | SMK_ACCESS2 = 16, /* make an access check with long labels */ | |
51 | SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */ | |
e114e473 CS |
52 | }; |
53 | ||
54 | /* | |
55 | * List locks | |
56 | */ | |
57 | static DEFINE_MUTEX(smack_list_lock); | |
58 | static DEFINE_MUTEX(smack_cipso_lock); | |
4bc87e62 | 59 | static DEFINE_MUTEX(smack_ambient_lock); |
6d3dc07c | 60 | static DEFINE_MUTEX(smk_netlbladdr_lock); |
e114e473 CS |
61 | |
62 | /* | |
63 | * This is the "ambient" label for network traffic. | |
64 | * If it isn't somehow marked, use this. | |
65 | * It can be reset via smackfs/ambient | |
66 | */ | |
f7112e6c | 67 | char *smack_net_ambient; |
e114e473 | 68 | |
e114e473 CS |
69 | /* |
70 | * This is the level in a CIPSO header that indicates a | |
71 | * smack label is contained directly in the category set. | |
72 | * It can be reset via smackfs/direct | |
73 | */ | |
74 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; | |
75 | ||
f7112e6c CS |
76 | /* |
77 | * This is the level in a CIPSO header that indicates a | |
78 | * secid is contained directly in the category set. | |
79 | * It can be reset via smackfs/mapped | |
80 | */ | |
81 | int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; | |
82 | ||
15446235 CS |
83 | /* |
84 | * Unless a process is running with this label even | |
85 | * having CAP_MAC_OVERRIDE isn't enough to grant | |
86 | * privilege to violate MAC policy. If no label is | |
87 | * designated (the NULL case) capabilities apply to | |
88 | * everyone. It is expected that the hat (^) label | |
89 | * will be used if any label is used. | |
90 | */ | |
91 | char *smack_onlycap; | |
92 | ||
6d3dc07c CS |
93 | /* |
94 | * Certain IP addresses may be designated as single label hosts. | |
95 | * Packets are sent there unlabeled, but only from tasks that | |
96 | * can write to the specified label. | |
97 | */ | |
7198e2ee EB |
98 | |
99 | LIST_HEAD(smk_netlbladdr_list); | |
272cd7a8 CS |
100 | |
101 | /* | |
102 | * Rule lists are maintained for each label. | |
f7112e6c | 103 | * This master list is just for reading /smack/load and /smack/load2. |
272cd7a8 CS |
104 | */ |
105 | struct smack_master_list { | |
106 | struct list_head list; | |
107 | struct smack_rule *smk_rule; | |
108 | }; | |
109 | ||
7198e2ee | 110 | LIST_HEAD(smack_rule_list); |
6d3dc07c | 111 | |
e114e473 | 112 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
e114e473 | 113 | |
4303154e EB |
114 | const char *smack_cipso_option = SMACK_CIPSO_OPTION; |
115 | ||
e114e473 CS |
116 | /* |
117 | * Values for parsing cipso rules | |
118 | * SMK_DIGITLEN: Length of a digit field in a rule. | |
b500ce8d AD |
119 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
120 | * SMK_CIPSOMAX: Maximum possible cipso rule length. | |
e114e473 CS |
121 | */ |
122 | #define SMK_DIGITLEN 4 | |
b500ce8d AD |
123 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
124 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) | |
125 | ||
126 | /* | |
127 | * Values for parsing MAC rules | |
128 | * SMK_ACCESS: Maximum possible combination of access permissions | |
129 | * SMK_ACCESSLEN: Maximum length for a rule access field | |
130 | * SMK_LOADLEN: Smack rule length | |
131 | */ | |
5c6d1125 JS |
132 | #define SMK_OACCESS "rwxa" |
133 | #define SMK_ACCESS "rwxat" | |
134 | #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) | |
135 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) | |
136 | #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) | |
137 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) | |
b500ce8d | 138 | |
f7112e6c CS |
139 | /* |
140 | * Stricly for CIPSO level manipulation. | |
141 | * Set the category bit number in a smack label sized buffer. | |
142 | */ | |
143 | static inline void smack_catset_bit(unsigned int cat, char *catsetp) | |
144 | { | |
145 | if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) | |
146 | return; | |
147 | ||
148 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); | |
149 | } | |
150 | ||
6d3dc07c CS |
151 | /** |
152 | * smk_netlabel_audit_set - fill a netlbl_audit struct | |
153 | * @nap: structure to fill | |
154 | */ | |
155 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) | |
156 | { | |
157 | nap->loginuid = audit_get_loginuid(current); | |
158 | nap->sessionid = audit_get_sessionid(current); | |
676dac4b | 159 | nap->secid = smack_to_secid(smk_of_current()); |
6d3dc07c CS |
160 | } |
161 | ||
162 | /* | |
f7112e6c | 163 | * Value for parsing single label host rules |
6d3dc07c | 164 | * "1.2.3.4 X" |
6d3dc07c CS |
165 | */ |
166 | #define SMK_NETLBLADDRMIN 9 | |
e114e473 | 167 | |
e114e473 CS |
168 | /** |
169 | * smk_set_access - add a rule to the rule list | |
170 | * @srp: the new rule to add | |
7898e1f8 CS |
171 | * @rule_list: the list of rules |
172 | * @rule_lock: the rule list lock | |
e114e473 CS |
173 | * |
174 | * Looks through the current subject/object/access list for | |
175 | * the subject/object pair and replaces the access that was | |
176 | * there. If the pair isn't found add it with the specified | |
177 | * access. | |
81ea714b | 178 | * |
7898e1f8 | 179 | * Returns 1 if a rule was found to exist already, 0 if it is new |
81ea714b SL |
180 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails |
181 | * during the allocation of the new pair to add. | |
e114e473 | 182 | */ |
7898e1f8 CS |
183 | static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list, |
184 | struct mutex *rule_lock) | |
e114e473 | 185 | { |
7198e2ee | 186 | struct smack_rule *sp; |
7898e1f8 | 187 | int found = 0; |
e114e473 | 188 | |
7898e1f8 CS |
189 | mutex_lock(rule_lock); |
190 | ||
272cd7a8 CS |
191 | /* |
192 | * Because the object label is less likely to match | |
193 | * than the subject label check it first | |
194 | */ | |
7898e1f8 | 195 | list_for_each_entry_rcu(sp, rule_list, list) { |
272cd7a8 CS |
196 | if (sp->smk_object == srp->smk_object && |
197 | sp->smk_subject == srp->smk_subject) { | |
7198e2ee EB |
198 | found = 1; |
199 | sp->smk_access = srp->smk_access; | |
e114e473 CS |
200 | break; |
201 | } | |
e114e473 | 202 | } |
7198e2ee | 203 | if (found == 0) |
7898e1f8 | 204 | list_add_rcu(&srp->list, rule_list); |
e114e473 | 205 | |
7898e1f8 | 206 | mutex_unlock(rule_lock); |
e114e473 | 207 | |
7898e1f8 | 208 | return found; |
e114e473 CS |
209 | } |
210 | ||
211 | /** | |
f7112e6c CS |
212 | * smk_fill_rule - Fill Smack rule from strings |
213 | * @subject: subject label string | |
214 | * @object: object label string | |
215 | * @access: access string | |
0e94ae17 JS |
216 | * @rule: Smack rule |
217 | * @import: if non-zero, import labels | |
3518721a | 218 | * @len: label length limit |
f7112e6c CS |
219 | * |
220 | * Returns 0 on success, -1 on failure | |
e114e473 | 221 | */ |
f7112e6c CS |
222 | static int smk_fill_rule(const char *subject, const char *object, |
223 | const char *access, struct smack_rule *rule, | |
3518721a | 224 | int import, int len) |
e114e473 | 225 | { |
f7112e6c | 226 | const char *cp; |
0e94ae17 | 227 | struct smack_known *skp; |
e114e473 | 228 | |
0e94ae17 | 229 | if (import) { |
3518721a | 230 | rule->smk_subject = smk_import(subject, len); |
0e94ae17 JS |
231 | if (rule->smk_subject == NULL) |
232 | return -1; | |
233 | ||
3518721a | 234 | rule->smk_object = smk_import(object, len); |
0e94ae17 JS |
235 | if (rule->smk_object == NULL) |
236 | return -1; | |
237 | } else { | |
3518721a | 238 | cp = smk_parse_smack(subject, len); |
f7112e6c CS |
239 | if (cp == NULL) |
240 | return -1; | |
241 | skp = smk_find_entry(cp); | |
242 | kfree(cp); | |
0e94ae17 JS |
243 | if (skp == NULL) |
244 | return -1; | |
245 | rule->smk_subject = skp->smk_known; | |
246 | ||
3518721a | 247 | cp = smk_parse_smack(object, len); |
f7112e6c CS |
248 | if (cp == NULL) |
249 | return -1; | |
250 | skp = smk_find_entry(cp); | |
251 | kfree(cp); | |
0e94ae17 JS |
252 | if (skp == NULL) |
253 | return -1; | |
254 | rule->smk_object = skp->smk_known; | |
255 | } | |
7198e2ee EB |
256 | |
257 | rule->smk_access = 0; | |
e114e473 | 258 | |
3518721a | 259 | for (cp = access; *cp != '\0'; cp++) { |
f7112e6c CS |
260 | switch (*cp) { |
261 | case '-': | |
262 | break; | |
263 | case 'r': | |
264 | case 'R': | |
265 | rule->smk_access |= MAY_READ; | |
266 | break; | |
267 | case 'w': | |
268 | case 'W': | |
269 | rule->smk_access |= MAY_WRITE; | |
270 | break; | |
271 | case 'x': | |
272 | case 'X': | |
273 | rule->smk_access |= MAY_EXEC; | |
274 | break; | |
275 | case 'a': | |
276 | case 'A': | |
277 | rule->smk_access |= MAY_APPEND; | |
278 | break; | |
279 | case 't': | |
280 | case 'T': | |
281 | rule->smk_access |= MAY_TRANSMUTE; | |
282 | break; | |
283 | default: | |
3518721a | 284 | return 0; |
f7112e6c | 285 | } |
e114e473 CS |
286 | } |
287 | ||
3518721a | 288 | return 0; |
f7112e6c | 289 | } |
e114e473 | 290 | |
f7112e6c CS |
291 | /** |
292 | * smk_parse_rule - parse Smack rule from load string | |
293 | * @data: string to be parsed whose size is SMK_LOADLEN | |
294 | * @rule: Smack rule | |
295 | * @import: if non-zero, import labels | |
296 | * | |
297 | * Returns 0 on success, -1 on errors. | |
298 | */ | |
299 | static int smk_parse_rule(const char *data, struct smack_rule *rule, int import) | |
300 | { | |
301 | int rc; | |
e114e473 | 302 | |
f7112e6c | 303 | rc = smk_fill_rule(data, data + SMK_LABELLEN, |
3518721a CS |
304 | data + SMK_LABELLEN + SMK_LABELLEN, rule, import, |
305 | SMK_LABELLEN); | |
f7112e6c CS |
306 | return rc; |
307 | } | |
e114e473 | 308 | |
f7112e6c CS |
309 | /** |
310 | * smk_parse_long_rule - parse Smack rule from rule string | |
311 | * @data: string to be parsed, null terminated | |
312 | * @rule: Smack rule | |
313 | * @import: if non-zero, import labels | |
314 | * | |
315 | * Returns 0 on success, -1 on failure | |
316 | */ | |
317 | static int smk_parse_long_rule(const char *data, struct smack_rule *rule, | |
318 | int import) | |
319 | { | |
320 | char *subject; | |
321 | char *object; | |
322 | char *access; | |
323 | int datalen; | |
324 | int rc = -1; | |
5c6d1125 | 325 | |
f7112e6c CS |
326 | /* |
327 | * This is probably inefficient, but safe. | |
328 | */ | |
329 | datalen = strlen(data); | |
330 | subject = kzalloc(datalen, GFP_KERNEL); | |
331 | if (subject == NULL) | |
332 | return -1; | |
333 | object = kzalloc(datalen, GFP_KERNEL); | |
334 | if (object == NULL) | |
335 | goto free_out_s; | |
336 | access = kzalloc(datalen, GFP_KERNEL); | |
337 | if (access == NULL) | |
338 | goto free_out_o; | |
339 | ||
340 | if (sscanf(data, "%s %s %s", subject, object, access) == 3) | |
3518721a | 341 | rc = smk_fill_rule(subject, object, access, rule, import, 0); |
f7112e6c CS |
342 | |
343 | kfree(access); | |
344 | free_out_o: | |
345 | kfree(object); | |
346 | free_out_s: | |
347 | kfree(subject); | |
348 | return rc; | |
828716c2 JS |
349 | } |
350 | ||
f7112e6c CS |
351 | #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
352 | #define SMK_LONG_FMT 1 /* Variable long label format */ | |
828716c2 | 353 | /** |
f7112e6c | 354 | * smk_write_rules_list - write() for any /smack rule file |
828716c2 JS |
355 | * @file: file pointer, not actually used |
356 | * @buf: where to get the data from | |
357 | * @count: bytes sent | |
358 | * @ppos: where to start - must be 0 | |
359 | * @rule_list: the list of rules to write to | |
360 | * @rule_lock: lock for the rule list | |
f7112e6c | 361 | * @format: /smack/load or /smack/load2 format. |
828716c2 JS |
362 | * |
363 | * Get one smack access rule from above. | |
f7112e6c CS |
364 | * The format for SMK_LONG_FMT is: |
365 | * "subject<whitespace>object<whitespace>access[<whitespace>...]" | |
366 | * The format for SMK_FIXED24_FMT is exactly: | |
367 | * "subject object rwxat" | |
828716c2 | 368 | */ |
f7112e6c CS |
369 | static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
370 | size_t count, loff_t *ppos, | |
371 | struct list_head *rule_list, | |
372 | struct mutex *rule_lock, int format) | |
828716c2 | 373 | { |
272cd7a8 CS |
374 | struct smack_master_list *smlp; |
375 | struct smack_known *skp; | |
828716c2 JS |
376 | struct smack_rule *rule; |
377 | char *data; | |
f7112e6c | 378 | int datalen; |
828716c2 | 379 | int rc = -EINVAL; |
272cd7a8 | 380 | int load = 0; |
828716c2 JS |
381 | |
382 | /* | |
383 | * No partial writes. | |
384 | * Enough data must be present. | |
385 | */ | |
386 | if (*ppos != 0) | |
387 | return -EINVAL; | |
828716c2 | 388 | |
f7112e6c CS |
389 | if (format == SMK_FIXED24_FMT) { |
390 | /* | |
391 | * Minor hack for backward compatibility | |
392 | */ | |
393 | if (count != SMK_OLOADLEN && count != SMK_LOADLEN) | |
394 | return -EINVAL; | |
395 | datalen = SMK_LOADLEN; | |
396 | } else | |
397 | datalen = count + 1; | |
398 | ||
399 | data = kzalloc(datalen, GFP_KERNEL); | |
828716c2 JS |
400 | if (data == NULL) |
401 | return -ENOMEM; | |
402 | ||
403 | if (copy_from_user(data, buf, count) != 0) { | |
404 | rc = -EFAULT; | |
405 | goto out; | |
406 | } | |
407 | ||
828716c2 JS |
408 | rule = kzalloc(sizeof(*rule), GFP_KERNEL); |
409 | if (rule == NULL) { | |
410 | rc = -ENOMEM; | |
411 | goto out; | |
412 | } | |
413 | ||
f7112e6c CS |
414 | if (format == SMK_LONG_FMT) { |
415 | /* | |
416 | * Be sure the data string is terminated. | |
417 | */ | |
418 | data[count] = '\0'; | |
419 | if (smk_parse_long_rule(data, rule, 1)) | |
420 | goto out_free_rule; | |
421 | } else { | |
422 | /* | |
423 | * More on the minor hack for backward compatibility | |
424 | */ | |
425 | if (count == (SMK_OLOADLEN)) | |
426 | data[SMK_OLOADLEN] = '-'; | |
427 | if (smk_parse_rule(data, rule, 1)) | |
428 | goto out_free_rule; | |
429 | } | |
430 | ||
828716c2 | 431 | |
272cd7a8 CS |
432 | if (rule_list == NULL) { |
433 | load = 1; | |
434 | skp = smk_find_entry(rule->smk_subject); | |
435 | rule_list = &skp->smk_rules; | |
436 | rule_lock = &skp->smk_rules_lock; | |
437 | } | |
438 | ||
7898e1f8 CS |
439 | rc = count; |
440 | /* | |
f7112e6c | 441 | * If this is a global as opposed to self and a new rule |
40809565 | 442 | * it needs to get added for reporting. |
7898e1f8 CS |
443 | * smk_set_access returns true if there was already a rule |
444 | * for the subject/object pair, and false if it was new. | |
445 | */ | |
f7112e6c CS |
446 | if (!smk_set_access(rule, rule_list, rule_lock)) { |
447 | if (load) { | |
448 | smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); | |
449 | if (smlp != NULL) { | |
450 | smlp->smk_rule = rule; | |
451 | list_add_rcu(&smlp->list, &smack_rule_list); | |
452 | } else | |
453 | rc = -ENOMEM; | |
454 | } | |
7898e1f8 | 455 | goto out; |
272cd7a8 | 456 | } |
e114e473 | 457 | |
7198e2ee EB |
458 | out_free_rule: |
459 | kfree(rule); | |
e114e473 CS |
460 | out: |
461 | kfree(data); | |
462 | return rc; | |
463 | } | |
464 | ||
7898e1f8 | 465 | /* |
40809565 | 466 | * Core logic for smackfs seq list operations. |
7898e1f8 CS |
467 | */ |
468 | ||
40809565 CS |
469 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
470 | struct list_head *head) | |
7898e1f8 | 471 | { |
272cd7a8 CS |
472 | struct list_head *list; |
473 | ||
474 | /* | |
475 | * This is 0 the first time through. | |
476 | */ | |
477 | if (s->index == 0) | |
40809565 | 478 | s->private = head; |
272cd7a8 CS |
479 | |
480 | if (s->private == NULL) | |
7898e1f8 | 481 | return NULL; |
272cd7a8 CS |
482 | |
483 | list = s->private; | |
484 | if (list_empty(list)) | |
7898e1f8 | 485 | return NULL; |
272cd7a8 CS |
486 | |
487 | if (s->index == 0) | |
488 | return list->next; | |
489 | return list; | |
7898e1f8 CS |
490 | } |
491 | ||
40809565 CS |
492 | static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
493 | struct list_head *head) | |
7898e1f8 CS |
494 | { |
495 | struct list_head *list = v; | |
496 | ||
40809565 | 497 | if (list_is_last(list, head)) { |
272cd7a8 | 498 | s->private = NULL; |
7898e1f8 CS |
499 | return NULL; |
500 | } | |
272cd7a8 | 501 | s->private = list->next; |
7898e1f8 CS |
502 | return list->next; |
503 | } | |
504 | ||
40809565 CS |
505 | static void smk_seq_stop(struct seq_file *s, void *v) |
506 | { | |
507 | /* No-op */ | |
508 | } | |
509 | ||
f7112e6c | 510 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
40809565 | 511 | { |
f7112e6c CS |
512 | /* |
513 | * Don't show any rules with label names too long for | |
514 | * interface file (/smack/load or /smack/load2) | |
515 | * because you should expect to be able to write | |
516 | * anything you read back. | |
517 | */ | |
518 | if (strlen(srp->smk_subject) >= max || strlen(srp->smk_object) >= max) | |
519 | return; | |
7898e1f8 | 520 | |
65ee7f45 RK |
521 | if (srp->smk_access == 0) |
522 | return; | |
523 | ||
f7112e6c | 524 | seq_printf(s, "%s %s", srp->smk_subject, srp->smk_object); |
7898e1f8 CS |
525 | |
526 | seq_putc(s, ' '); | |
527 | ||
528 | if (srp->smk_access & MAY_READ) | |
529 | seq_putc(s, 'r'); | |
530 | if (srp->smk_access & MAY_WRITE) | |
531 | seq_putc(s, 'w'); | |
532 | if (srp->smk_access & MAY_EXEC) | |
533 | seq_putc(s, 'x'); | |
534 | if (srp->smk_access & MAY_APPEND) | |
535 | seq_putc(s, 'a'); | |
536 | if (srp->smk_access & MAY_TRANSMUTE) | |
537 | seq_putc(s, 't'); | |
7898e1f8 CS |
538 | |
539 | seq_putc(s, '\n'); | |
f7112e6c CS |
540 | } |
541 | ||
542 | /* | |
543 | * Seq_file read operations for /smack/load | |
544 | */ | |
545 | ||
546 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) | |
547 | { | |
548 | return smk_seq_start(s, pos, &smack_rule_list); | |
549 | } | |
550 | ||
551 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
552 | { | |
553 | return smk_seq_next(s, v, pos, &smack_rule_list); | |
554 | } | |
555 | ||
556 | static int load_seq_show(struct seq_file *s, void *v) | |
557 | { | |
558 | struct list_head *list = v; | |
559 | struct smack_master_list *smlp = | |
560 | list_entry(list, struct smack_master_list, list); | |
561 | ||
562 | smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); | |
7898e1f8 CS |
563 | |
564 | return 0; | |
565 | } | |
566 | ||
7898e1f8 | 567 | static const struct seq_operations load_seq_ops = { |
f7112e6c CS |
568 | .start = load2_seq_start, |
569 | .next = load2_seq_next, | |
7898e1f8 | 570 | .show = load_seq_show, |
40809565 | 571 | .stop = smk_seq_stop, |
7898e1f8 CS |
572 | }; |
573 | ||
574 | /** | |
575 | * smk_open_load - open() for /smack/load | |
576 | * @inode: inode structure representing file | |
577 | * @file: "load" file pointer | |
578 | * | |
579 | * For reading, use load_seq_* seq_file reading operations. | |
580 | */ | |
581 | static int smk_open_load(struct inode *inode, struct file *file) | |
582 | { | |
583 | return seq_open(file, &load_seq_ops); | |
584 | } | |
585 | ||
586 | /** | |
587 | * smk_write_load - write() for /smack/load | |
588 | * @file: file pointer, not actually used | |
589 | * @buf: where to get the data from | |
590 | * @count: bytes sent | |
591 | * @ppos: where to start - must be 0 | |
592 | * | |
593 | */ | |
594 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
595 | size_t count, loff_t *ppos) | |
596 | { | |
7898e1f8 CS |
597 | /* |
598 | * Must have privilege. | |
599 | * No partial writes. | |
600 | * Enough data must be present. | |
601 | */ | |
1880eff7 | 602 | if (!smack_privileged(CAP_MAC_ADMIN)) |
7898e1f8 CS |
603 | return -EPERM; |
604 | ||
f7112e6c CS |
605 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
606 | SMK_FIXED24_FMT); | |
7898e1f8 CS |
607 | } |
608 | ||
e114e473 CS |
609 | static const struct file_operations smk_load_ops = { |
610 | .open = smk_open_load, | |
611 | .read = seq_read, | |
612 | .llseek = seq_lseek, | |
613 | .write = smk_write_load, | |
cb622bbb | 614 | .release = seq_release, |
e114e473 CS |
615 | }; |
616 | ||
617 | /** | |
618 | * smk_cipso_doi - initialize the CIPSO domain | |
619 | */ | |
30aa4faf | 620 | static void smk_cipso_doi(void) |
e114e473 CS |
621 | { |
622 | int rc; | |
623 | struct cipso_v4_doi *doip; | |
6d3dc07c | 624 | struct netlbl_audit nai; |
e114e473 | 625 | |
6d3dc07c | 626 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 627 | |
6d3dc07c | 628 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
629 | if (rc != 0) |
630 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
631 | __func__, __LINE__, rc); | |
632 | ||
633 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
634 | if (doip == NULL) | |
635 | panic("smack: Failed to initialize cipso DOI.\n"); | |
636 | doip->map.std = NULL; | |
637 | doip->doi = smk_cipso_doi_value; | |
638 | doip->type = CIPSO_V4_MAP_PASS; | |
639 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
640 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
641 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
642 | ||
6d3dc07c | 643 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 644 | if (rc != 0) { |
6c2e8ac0 PM |
645 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
646 | __func__, __LINE__, rc); | |
647 | kfree(doip); | |
648 | return; | |
649 | } | |
6d3dc07c | 650 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
651 | if (rc != 0) { |
652 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 653 | __func__, __LINE__, rc); |
b1edeb10 | 654 | kfree(doip); |
6c2e8ac0 | 655 | return; |
b1edeb10 | 656 | } |
e114e473 CS |
657 | } |
658 | ||
4bc87e62 CS |
659 | /** |
660 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 661 | * @oldambient: previous domain string |
4bc87e62 | 662 | */ |
30aa4faf | 663 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
664 | { |
665 | int rc; | |
6d3dc07c | 666 | struct netlbl_audit nai; |
4bc87e62 | 667 | |
6d3dc07c | 668 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
669 | |
670 | if (oldambient != NULL) { | |
6d3dc07c | 671 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
672 | if (rc != 0) |
673 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
674 | __func__, __LINE__, rc); | |
675 | } | |
f7112e6c CS |
676 | if (smack_net_ambient == NULL) |
677 | smack_net_ambient = smack_known_floor.smk_known; | |
4bc87e62 | 678 | |
6d3dc07c CS |
679 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET, |
680 | NULL, NULL, &nai); | |
4bc87e62 CS |
681 | if (rc != 0) |
682 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
683 | __func__, __LINE__, rc); | |
684 | } | |
685 | ||
e114e473 CS |
686 | /* |
687 | * Seq_file read operations for /smack/cipso | |
688 | */ | |
689 | ||
690 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
691 | { | |
40809565 | 692 | return smk_seq_start(s, pos, &smack_known_list); |
e114e473 CS |
693 | } |
694 | ||
695 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
696 | { | |
40809565 | 697 | return smk_seq_next(s, v, pos, &smack_known_list); |
e114e473 CS |
698 | } |
699 | ||
700 | /* | |
701 | * Print cipso labels in format: | |
702 | * label level[/cat[,cat]] | |
703 | */ | |
704 | static int cipso_seq_show(struct seq_file *s, void *v) | |
705 | { | |
7198e2ee EB |
706 | struct list_head *list = v; |
707 | struct smack_known *skp = | |
708 | list_entry(list, struct smack_known, list); | |
f7112e6c | 709 | struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
e114e473 | 710 | char sep = '/'; |
e114e473 | 711 | int i; |
e114e473 | 712 | |
f7112e6c CS |
713 | /* |
714 | * Don't show a label that could not have been set using | |
715 | * /smack/cipso. This is in support of the notion that | |
716 | * anything read from /smack/cipso ought to be writeable | |
717 | * to /smack/cipso. | |
718 | * | |
719 | * /smack/cipso2 should be used instead. | |
720 | */ | |
721 | if (strlen(skp->smk_known) >= SMK_LABELLEN) | |
e114e473 CS |
722 | return 0; |
723 | ||
f7112e6c | 724 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
e114e473 | 725 | |
f7112e6c CS |
726 | for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; |
727 | i = netlbl_secattr_catmap_walk(cmp, i + 1)) { | |
728 | seq_printf(s, "%c%d", sep, i); | |
729 | sep = ','; | |
730 | } | |
e114e473 CS |
731 | |
732 | seq_putc(s, '\n'); | |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
88e9d34c | 737 | static const struct seq_operations cipso_seq_ops = { |
e114e473 | 738 | .start = cipso_seq_start, |
e114e473 CS |
739 | .next = cipso_seq_next, |
740 | .show = cipso_seq_show, | |
40809565 | 741 | .stop = smk_seq_stop, |
e114e473 CS |
742 | }; |
743 | ||
744 | /** | |
745 | * smk_open_cipso - open() for /smack/cipso | |
746 | * @inode: inode structure representing file | |
747 | * @file: "cipso" file pointer | |
748 | * | |
749 | * Connect our cipso_seq_* operations with /smack/cipso | |
750 | * file_operations | |
751 | */ | |
752 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
753 | { | |
754 | return seq_open(file, &cipso_seq_ops); | |
755 | } | |
756 | ||
757 | /** | |
f7112e6c | 758 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
251a2a95 | 759 | * @file: file pointer, not actually used |
e114e473 CS |
760 | * @buf: where to get the data from |
761 | * @count: bytes sent | |
762 | * @ppos: where to start | |
f7112e6c | 763 | * @format: /smack/cipso or /smack/cipso2 |
e114e473 CS |
764 | * |
765 | * Accepts only one cipso rule per write call. | |
766 | * Returns number of bytes written or error code, as appropriate | |
767 | */ | |
f7112e6c CS |
768 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
769 | size_t count, loff_t *ppos, int format) | |
e114e473 CS |
770 | { |
771 | struct smack_known *skp; | |
f7112e6c CS |
772 | struct netlbl_lsm_secattr ncats; |
773 | char mapcatset[SMK_CIPSOLEN]; | |
e114e473 | 774 | int maplevel; |
f7112e6c | 775 | unsigned int cat; |
e114e473 CS |
776 | int catlen; |
777 | ssize_t rc = -EINVAL; | |
778 | char *data = NULL; | |
779 | char *rule; | |
780 | int ret; | |
781 | int i; | |
782 | ||
783 | /* | |
784 | * Must have privilege. | |
785 | * No partial writes. | |
786 | * Enough data must be present. | |
787 | */ | |
1880eff7 | 788 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
789 | return -EPERM; |
790 | if (*ppos != 0) | |
791 | return -EINVAL; | |
f7112e6c CS |
792 | if (format == SMK_FIXED24_FMT && |
793 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) | |
e114e473 CS |
794 | return -EINVAL; |
795 | ||
796 | data = kzalloc(count + 1, GFP_KERNEL); | |
797 | if (data == NULL) | |
798 | return -ENOMEM; | |
799 | ||
800 | if (copy_from_user(data, buf, count) != 0) { | |
801 | rc = -EFAULT; | |
802 | goto unlockedout; | |
803 | } | |
804 | ||
805 | data[count] = '\0'; | |
806 | rule = data; | |
807 | /* | |
808 | * Only allow one writer at a time. Writes should be | |
809 | * quite rare and small in any case. | |
810 | */ | |
811 | mutex_lock(&smack_cipso_lock); | |
812 | ||
813 | skp = smk_import_entry(rule, 0); | |
814 | if (skp == NULL) | |
815 | goto out; | |
816 | ||
f7112e6c CS |
817 | if (format == SMK_FIXED24_FMT) |
818 | rule += SMK_LABELLEN; | |
819 | else | |
820 | rule += strlen(skp->smk_known); | |
821 | ||
e114e473 CS |
822 | ret = sscanf(rule, "%d", &maplevel); |
823 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
824 | goto out; | |
825 | ||
826 | rule += SMK_DIGITLEN; | |
827 | ret = sscanf(rule, "%d", &catlen); | |
828 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
829 | goto out; | |
830 | ||
f7112e6c CS |
831 | if (format == SMK_FIXED24_FMT && |
832 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) | |
e114e473 CS |
833 | goto out; |
834 | ||
835 | memset(mapcatset, 0, sizeof(mapcatset)); | |
836 | ||
837 | for (i = 0; i < catlen; i++) { | |
838 | rule += SMK_DIGITLEN; | |
f7112e6c | 839 | ret = sscanf(rule, "%u", &cat); |
e114e473 CS |
840 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) |
841 | goto out; | |
842 | ||
843 | smack_catset_bit(cat, mapcatset); | |
844 | } | |
845 | ||
f7112e6c CS |
846 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
847 | if (rc >= 0) { | |
848 | netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat); | |
849 | skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; | |
850 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; | |
851 | rc = count; | |
e114e473 CS |
852 | } |
853 | ||
e114e473 CS |
854 | out: |
855 | mutex_unlock(&smack_cipso_lock); | |
856 | unlockedout: | |
857 | kfree(data); | |
858 | return rc; | |
859 | } | |
860 | ||
f7112e6c CS |
861 | /** |
862 | * smk_write_cipso - write() for /smack/cipso | |
863 | * @file: file pointer, not actually used | |
864 | * @buf: where to get the data from | |
865 | * @count: bytes sent | |
866 | * @ppos: where to start | |
867 | * | |
868 | * Accepts only one cipso rule per write call. | |
869 | * Returns number of bytes written or error code, as appropriate | |
870 | */ | |
871 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
872 | size_t count, loff_t *ppos) | |
873 | { | |
874 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); | |
875 | } | |
876 | ||
e114e473 CS |
877 | static const struct file_operations smk_cipso_ops = { |
878 | .open = smk_open_cipso, | |
879 | .read = seq_read, | |
880 | .llseek = seq_lseek, | |
881 | .write = smk_write_cipso, | |
882 | .release = seq_release, | |
883 | }; | |
884 | ||
f7112e6c CS |
885 | /* |
886 | * Seq_file read operations for /smack/cipso2 | |
887 | */ | |
888 | ||
889 | /* | |
890 | * Print cipso labels in format: | |
891 | * label level[/cat[,cat]] | |
892 | */ | |
893 | static int cipso2_seq_show(struct seq_file *s, void *v) | |
894 | { | |
895 | struct list_head *list = v; | |
896 | struct smack_known *skp = | |
897 | list_entry(list, struct smack_known, list); | |
898 | struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; | |
899 | char sep = '/'; | |
900 | int i; | |
901 | ||
902 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); | |
903 | ||
904 | for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; | |
905 | i = netlbl_secattr_catmap_walk(cmp, i + 1)) { | |
906 | seq_printf(s, "%c%d", sep, i); | |
907 | sep = ','; | |
908 | } | |
909 | ||
910 | seq_putc(s, '\n'); | |
911 | ||
912 | return 0; | |
913 | } | |
914 | ||
915 | static const struct seq_operations cipso2_seq_ops = { | |
916 | .start = cipso_seq_start, | |
917 | .next = cipso_seq_next, | |
918 | .show = cipso2_seq_show, | |
919 | .stop = smk_seq_stop, | |
920 | }; | |
921 | ||
922 | /** | |
923 | * smk_open_cipso2 - open() for /smack/cipso2 | |
924 | * @inode: inode structure representing file | |
925 | * @file: "cipso2" file pointer | |
926 | * | |
927 | * Connect our cipso_seq_* operations with /smack/cipso2 | |
928 | * file_operations | |
929 | */ | |
930 | static int smk_open_cipso2(struct inode *inode, struct file *file) | |
931 | { | |
932 | return seq_open(file, &cipso2_seq_ops); | |
933 | } | |
934 | ||
935 | /** | |
936 | * smk_write_cipso2 - write() for /smack/cipso2 | |
937 | * @file: file pointer, not actually used | |
938 | * @buf: where to get the data from | |
939 | * @count: bytes sent | |
940 | * @ppos: where to start | |
941 | * | |
942 | * Accepts only one cipso rule per write call. | |
943 | * Returns number of bytes written or error code, as appropriate | |
944 | */ | |
945 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, | |
946 | size_t count, loff_t *ppos) | |
947 | { | |
948 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); | |
949 | } | |
950 | ||
951 | static const struct file_operations smk_cipso2_ops = { | |
952 | .open = smk_open_cipso2, | |
953 | .read = seq_read, | |
954 | .llseek = seq_lseek, | |
955 | .write = smk_write_cipso2, | |
956 | .release = seq_release, | |
957 | }; | |
958 | ||
6d3dc07c CS |
959 | /* |
960 | * Seq_file read operations for /smack/netlabel | |
961 | */ | |
962 | ||
963 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) | |
964 | { | |
40809565 | 965 | return smk_seq_start(s, pos, &smk_netlbladdr_list); |
6d3dc07c CS |
966 | } |
967 | ||
968 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
969 | { | |
40809565 | 970 | return smk_seq_next(s, v, pos, &smk_netlbladdr_list); |
6d3dc07c | 971 | } |
6d3dc07c CS |
972 | #define BEBITS (sizeof(__be32) * 8) |
973 | ||
974 | /* | |
975 | * Print host/label pairs | |
976 | */ | |
977 | static int netlbladdr_seq_show(struct seq_file *s, void *v) | |
978 | { | |
7198e2ee EB |
979 | struct list_head *list = v; |
980 | struct smk_netlbladdr *skp = | |
981 | list_entry(list, struct smk_netlbladdr, list); | |
6d3dc07c | 982 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
113a0e45 | 983 | int maskn; |
984 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); | |
6d3dc07c | 985 | |
113a0e45 | 986 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
6d3dc07c CS |
987 | |
988 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", | |
989 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
88e9d34c | 994 | static const struct seq_operations netlbladdr_seq_ops = { |
6d3dc07c | 995 | .start = netlbladdr_seq_start, |
6d3dc07c CS |
996 | .next = netlbladdr_seq_next, |
997 | .show = netlbladdr_seq_show, | |
40809565 | 998 | .stop = smk_seq_stop, |
6d3dc07c CS |
999 | }; |
1000 | ||
1001 | /** | |
1002 | * smk_open_netlbladdr - open() for /smack/netlabel | |
1003 | * @inode: inode structure representing file | |
1004 | * @file: "netlabel" file pointer | |
1005 | * | |
1006 | * Connect our netlbladdr_seq_* operations with /smack/netlabel | |
1007 | * file_operations | |
1008 | */ | |
1009 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) | |
1010 | { | |
1011 | return seq_open(file, &netlbladdr_seq_ops); | |
1012 | } | |
1013 | ||
113a0e45 | 1014 | /** |
1015 | * smk_netlbladdr_insert | |
1016 | * @new : netlabel to insert | |
1017 | * | |
1018 | * This helper insert netlabel in the smack_netlbladdrs list | |
1019 | * sorted by netmask length (longest to smallest) | |
7198e2ee EB |
1020 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
1021 | * | |
113a0e45 | 1022 | */ |
1023 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) | |
1024 | { | |
7198e2ee | 1025 | struct smk_netlbladdr *m, *m_next; |
113a0e45 | 1026 | |
7198e2ee EB |
1027 | if (list_empty(&smk_netlbladdr_list)) { |
1028 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 1029 | return; |
1030 | } | |
1031 | ||
05725f7e JP |
1032 | m = list_entry_rcu(smk_netlbladdr_list.next, |
1033 | struct smk_netlbladdr, list); | |
7198e2ee | 1034 | |
113a0e45 | 1035 | /* the comparison '>' is a bit hacky, but works */ |
7198e2ee EB |
1036 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
1037 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 1038 | return; |
1039 | } | |
7198e2ee EB |
1040 | |
1041 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { | |
1042 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { | |
1043 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 1044 | return; |
1045 | } | |
05725f7e JP |
1046 | m_next = list_entry_rcu(m->list.next, |
1047 | struct smk_netlbladdr, list); | |
7198e2ee EB |
1048 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { |
1049 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 1050 | return; |
1051 | } | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | ||
6d3dc07c CS |
1056 | /** |
1057 | * smk_write_netlbladdr - write() for /smack/netlabel | |
251a2a95 | 1058 | * @file: file pointer, not actually used |
6d3dc07c CS |
1059 | * @buf: where to get the data from |
1060 | * @count: bytes sent | |
1061 | * @ppos: where to start | |
1062 | * | |
1063 | * Accepts only one netlbladdr per write call. | |
1064 | * Returns number of bytes written or error code, as appropriate | |
1065 | */ | |
1066 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, | |
1067 | size_t count, loff_t *ppos) | |
1068 | { | |
1069 | struct smk_netlbladdr *skp; | |
1070 | struct sockaddr_in newname; | |
f7112e6c | 1071 | char *smack; |
6d3dc07c | 1072 | char *sp; |
f7112e6c | 1073 | char *data; |
6d3dc07c CS |
1074 | char *host = (char *)&newname.sin_addr.s_addr; |
1075 | int rc; | |
1076 | struct netlbl_audit audit_info; | |
1077 | struct in_addr mask; | |
1078 | unsigned int m; | |
7198e2ee | 1079 | int found; |
113a0e45 | 1080 | u32 mask_bits = (1<<31); |
6d3dc07c | 1081 | __be32 nsa; |
113a0e45 | 1082 | u32 temp_mask; |
6d3dc07c CS |
1083 | |
1084 | /* | |
1085 | * Must have privilege. | |
1086 | * No partial writes. | |
1087 | * Enough data must be present. | |
1088 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
1089 | * "<addr, as a.b.c.d><space><label>" | |
1090 | */ | |
1880eff7 | 1091 | if (!smack_privileged(CAP_MAC_ADMIN)) |
6d3dc07c CS |
1092 | return -EPERM; |
1093 | if (*ppos != 0) | |
1094 | return -EINVAL; | |
f7112e6c | 1095 | if (count < SMK_NETLBLADDRMIN) |
6d3dc07c | 1096 | return -EINVAL; |
f7112e6c CS |
1097 | |
1098 | data = kzalloc(count + 1, GFP_KERNEL); | |
1099 | if (data == NULL) | |
1100 | return -ENOMEM; | |
1101 | ||
1102 | if (copy_from_user(data, buf, count) != 0) { | |
1103 | rc = -EFAULT; | |
1104 | goto free_data_out; | |
1105 | } | |
1106 | ||
1107 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1108 | if (smack == NULL) { | |
1109 | rc = -ENOMEM; | |
1110 | goto free_data_out; | |
1111 | } | |
6d3dc07c CS |
1112 | |
1113 | data[count] = '\0'; | |
1114 | ||
1115 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", | |
1116 | &host[0], &host[1], &host[2], &host[3], &m, smack); | |
1117 | if (rc != 6) { | |
1118 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
1119 | &host[0], &host[1], &host[2], &host[3], smack); | |
f7112e6c CS |
1120 | if (rc != 5) { |
1121 | rc = -EINVAL; | |
1122 | goto free_out; | |
1123 | } | |
6d3dc07c CS |
1124 | m = BEBITS; |
1125 | } | |
f7112e6c CS |
1126 | if (m > BEBITS) { |
1127 | rc = -EINVAL; | |
1128 | goto free_out; | |
1129 | } | |
6d3dc07c | 1130 | |
f7112e6c CS |
1131 | /* |
1132 | * If smack begins with '-', it is an option, don't import it | |
1133 | */ | |
4303154e EB |
1134 | if (smack[0] != '-') { |
1135 | sp = smk_import(smack, 0); | |
f7112e6c CS |
1136 | if (sp == NULL) { |
1137 | rc = -EINVAL; | |
1138 | goto free_out; | |
1139 | } | |
4303154e EB |
1140 | } else { |
1141 | /* check known options */ | |
1142 | if (strcmp(smack, smack_cipso_option) == 0) | |
1143 | sp = (char *)smack_cipso_option; | |
f7112e6c CS |
1144 | else { |
1145 | rc = -EINVAL; | |
1146 | goto free_out; | |
1147 | } | |
4303154e | 1148 | } |
6d3dc07c | 1149 | |
113a0e45 | 1150 | for (temp_mask = 0; m > 0; m--) { |
1151 | temp_mask |= mask_bits; | |
1152 | mask_bits >>= 1; | |
6d3dc07c | 1153 | } |
113a0e45 | 1154 | mask.s_addr = cpu_to_be32(temp_mask); |
1155 | ||
1156 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
1157 | /* |
1158 | * Only allow one writer at a time. Writes should be | |
1159 | * quite rare and small in any case. | |
1160 | */ | |
1161 | mutex_lock(&smk_netlbladdr_lock); | |
1162 | ||
1163 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 1164 | /* try to find if the prefix is already in the list */ |
7198e2ee EB |
1165 | found = 0; |
1166 | list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { | |
6d3dc07c | 1167 | if (skp->smk_host.sin_addr.s_addr == nsa && |
7198e2ee EB |
1168 | skp->smk_mask.s_addr == mask.s_addr) { |
1169 | found = 1; | |
6d3dc07c | 1170 | break; |
7198e2ee EB |
1171 | } |
1172 | } | |
6d3dc07c CS |
1173 | smk_netlabel_audit_set(&audit_info); |
1174 | ||
7198e2ee | 1175 | if (found == 0) { |
6d3dc07c CS |
1176 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
1177 | if (skp == NULL) | |
1178 | rc = -ENOMEM; | |
1179 | else { | |
1180 | rc = 0; | |
1181 | skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; | |
1182 | skp->smk_mask.s_addr = mask.s_addr; | |
6d3dc07c | 1183 | skp->smk_label = sp; |
113a0e45 | 1184 | smk_netlbladdr_insert(skp); |
6d3dc07c CS |
1185 | } |
1186 | } else { | |
4303154e | 1187 | /* we delete the unlabeled entry, only if the previous label |
25985edc | 1188 | * wasn't the special CIPSO option */ |
4303154e EB |
1189 | if (skp->smk_label != smack_cipso_option) |
1190 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, | |
1191 | &skp->smk_host.sin_addr, &skp->smk_mask, | |
1192 | PF_INET, &audit_info); | |
1193 | else | |
1194 | rc = 0; | |
6d3dc07c CS |
1195 | skp->smk_label = sp; |
1196 | } | |
1197 | ||
1198 | /* | |
1199 | * Now tell netlabel about the single label nature of | |
1200 | * this host so that incoming packets get labeled. | |
4303154e | 1201 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1202 | */ |
4303154e | 1203 | if (rc == 0 && sp != smack_cipso_option) |
6d3dc07c CS |
1204 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
1205 | &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, | |
1206 | smack_to_secid(skp->smk_label), &audit_info); | |
1207 | ||
1208 | if (rc == 0) | |
1209 | rc = count; | |
1210 | ||
1211 | mutex_unlock(&smk_netlbladdr_lock); | |
1212 | ||
f7112e6c CS |
1213 | free_out: |
1214 | kfree(smack); | |
1215 | free_data_out: | |
1216 | kfree(data); | |
1217 | ||
6d3dc07c CS |
1218 | return rc; |
1219 | } | |
1220 | ||
1221 | static const struct file_operations smk_netlbladdr_ops = { | |
1222 | .open = smk_open_netlbladdr, | |
1223 | .read = seq_read, | |
1224 | .llseek = seq_lseek, | |
1225 | .write = smk_write_netlbladdr, | |
1226 | .release = seq_release, | |
1227 | }; | |
1228 | ||
e114e473 CS |
1229 | /** |
1230 | * smk_read_doi - read() for /smack/doi | |
1231 | * @filp: file pointer, not actually used | |
1232 | * @buf: where to put the result | |
1233 | * @count: maximum to send along | |
1234 | * @ppos: where to start | |
1235 | * | |
1236 | * Returns number of bytes read or error code, as appropriate | |
1237 | */ | |
1238 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1239 | size_t count, loff_t *ppos) | |
1240 | { | |
1241 | char temp[80]; | |
1242 | ssize_t rc; | |
1243 | ||
1244 | if (*ppos != 0) | |
1245 | return 0; | |
1246 | ||
1247 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1248 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1249 | ||
1250 | return rc; | |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1255 | * @file: file pointer, not actually used |
e114e473 CS |
1256 | * @buf: where to get the data from |
1257 | * @count: bytes sent | |
1258 | * @ppos: where to start | |
1259 | * | |
1260 | * Returns number of bytes written or error code, as appropriate | |
1261 | */ | |
1262 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1263 | size_t count, loff_t *ppos) | |
1264 | { | |
1265 | char temp[80]; | |
1266 | int i; | |
1267 | ||
1880eff7 | 1268 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1269 | return -EPERM; |
1270 | ||
1271 | if (count >= sizeof(temp) || count == 0) | |
1272 | return -EINVAL; | |
1273 | ||
1274 | if (copy_from_user(temp, buf, count) != 0) | |
1275 | return -EFAULT; | |
1276 | ||
1277 | temp[count] = '\0'; | |
1278 | ||
1279 | if (sscanf(temp, "%d", &i) != 1) | |
1280 | return -EINVAL; | |
1281 | ||
1282 | smk_cipso_doi_value = i; | |
1283 | ||
1284 | smk_cipso_doi(); | |
1285 | ||
1286 | return count; | |
1287 | } | |
1288 | ||
1289 | static const struct file_operations smk_doi_ops = { | |
1290 | .read = smk_read_doi, | |
1291 | .write = smk_write_doi, | |
6038f373 | 1292 | .llseek = default_llseek, |
e114e473 CS |
1293 | }; |
1294 | ||
1295 | /** | |
1296 | * smk_read_direct - read() for /smack/direct | |
1297 | * @filp: file pointer, not actually used | |
1298 | * @buf: where to put the result | |
1299 | * @count: maximum to send along | |
1300 | * @ppos: where to start | |
1301 | * | |
1302 | * Returns number of bytes read or error code, as appropriate | |
1303 | */ | |
1304 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1305 | size_t count, loff_t *ppos) | |
1306 | { | |
1307 | char temp[80]; | |
1308 | ssize_t rc; | |
1309 | ||
1310 | if (*ppos != 0) | |
1311 | return 0; | |
1312 | ||
1313 | sprintf(temp, "%d", smack_cipso_direct); | |
1314 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1315 | ||
1316 | return rc; | |
1317 | } | |
1318 | ||
1319 | /** | |
1320 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1321 | * @file: file pointer, not actually used |
e114e473 CS |
1322 | * @buf: where to get the data from |
1323 | * @count: bytes sent | |
1324 | * @ppos: where to start | |
1325 | * | |
1326 | * Returns number of bytes written or error code, as appropriate | |
1327 | */ | |
1328 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1329 | size_t count, loff_t *ppos) | |
1330 | { | |
f7112e6c | 1331 | struct smack_known *skp; |
e114e473 CS |
1332 | char temp[80]; |
1333 | int i; | |
1334 | ||
1880eff7 | 1335 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1336 | return -EPERM; |
1337 | ||
1338 | if (count >= sizeof(temp) || count == 0) | |
1339 | return -EINVAL; | |
1340 | ||
1341 | if (copy_from_user(temp, buf, count) != 0) | |
1342 | return -EFAULT; | |
1343 | ||
1344 | temp[count] = '\0'; | |
1345 | ||
1346 | if (sscanf(temp, "%d", &i) != 1) | |
1347 | return -EINVAL; | |
1348 | ||
f7112e6c CS |
1349 | /* |
1350 | * Don't do anything if the value hasn't actually changed. | |
1351 | * If it is changing reset the level on entries that were | |
1352 | * set up to be direct when they were created. | |
1353 | */ | |
1354 | if (smack_cipso_direct != i) { | |
1355 | mutex_lock(&smack_known_lock); | |
1356 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1357 | if (skp->smk_netlabel.attr.mls.lvl == | |
1358 | smack_cipso_direct) | |
1359 | skp->smk_netlabel.attr.mls.lvl = i; | |
1360 | smack_cipso_direct = i; | |
1361 | mutex_unlock(&smack_known_lock); | |
1362 | } | |
e114e473 CS |
1363 | |
1364 | return count; | |
1365 | } | |
1366 | ||
1367 | static const struct file_operations smk_direct_ops = { | |
1368 | .read = smk_read_direct, | |
1369 | .write = smk_write_direct, | |
6038f373 | 1370 | .llseek = default_llseek, |
e114e473 CS |
1371 | }; |
1372 | ||
f7112e6c CS |
1373 | /** |
1374 | * smk_read_mapped - read() for /smack/mapped | |
1375 | * @filp: file pointer, not actually used | |
1376 | * @buf: where to put the result | |
1377 | * @count: maximum to send along | |
1378 | * @ppos: where to start | |
1379 | * | |
1380 | * Returns number of bytes read or error code, as appropriate | |
1381 | */ | |
1382 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, | |
1383 | size_t count, loff_t *ppos) | |
1384 | { | |
1385 | char temp[80]; | |
1386 | ssize_t rc; | |
1387 | ||
1388 | if (*ppos != 0) | |
1389 | return 0; | |
1390 | ||
1391 | sprintf(temp, "%d", smack_cipso_mapped); | |
1392 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1393 | ||
1394 | return rc; | |
1395 | } | |
1396 | ||
1397 | /** | |
1398 | * smk_write_mapped - write() for /smack/mapped | |
1399 | * @file: file pointer, not actually used | |
1400 | * @buf: where to get the data from | |
1401 | * @count: bytes sent | |
1402 | * @ppos: where to start | |
1403 | * | |
1404 | * Returns number of bytes written or error code, as appropriate | |
1405 | */ | |
1406 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, | |
1407 | size_t count, loff_t *ppos) | |
1408 | { | |
1409 | struct smack_known *skp; | |
1410 | char temp[80]; | |
1411 | int i; | |
1412 | ||
1880eff7 | 1413 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1414 | return -EPERM; |
1415 | ||
1416 | if (count >= sizeof(temp) || count == 0) | |
1417 | return -EINVAL; | |
1418 | ||
1419 | if (copy_from_user(temp, buf, count) != 0) | |
1420 | return -EFAULT; | |
1421 | ||
1422 | temp[count] = '\0'; | |
1423 | ||
1424 | if (sscanf(temp, "%d", &i) != 1) | |
1425 | return -EINVAL; | |
1426 | ||
1427 | /* | |
1428 | * Don't do anything if the value hasn't actually changed. | |
1429 | * If it is changing reset the level on entries that were | |
1430 | * set up to be mapped when they were created. | |
1431 | */ | |
1432 | if (smack_cipso_mapped != i) { | |
1433 | mutex_lock(&smack_known_lock); | |
1434 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1435 | if (skp->smk_netlabel.attr.mls.lvl == | |
1436 | smack_cipso_mapped) | |
1437 | skp->smk_netlabel.attr.mls.lvl = i; | |
1438 | smack_cipso_mapped = i; | |
1439 | mutex_unlock(&smack_known_lock); | |
1440 | } | |
1441 | ||
1442 | return count; | |
1443 | } | |
1444 | ||
1445 | static const struct file_operations smk_mapped_ops = { | |
1446 | .read = smk_read_mapped, | |
1447 | .write = smk_write_mapped, | |
1448 | .llseek = default_llseek, | |
1449 | }; | |
1450 | ||
e114e473 CS |
1451 | /** |
1452 | * smk_read_ambient - read() for /smack/ambient | |
1453 | * @filp: file pointer, not actually used | |
1454 | * @buf: where to put the result | |
1455 | * @cn: maximum to send along | |
1456 | * @ppos: where to start | |
1457 | * | |
1458 | * Returns number of bytes read or error code, as appropriate | |
1459 | */ | |
1460 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1461 | size_t cn, loff_t *ppos) | |
1462 | { | |
1463 | ssize_t rc; | |
e114e473 CS |
1464 | int asize; |
1465 | ||
1466 | if (*ppos != 0) | |
1467 | return 0; | |
1468 | /* | |
1469 | * Being careful to avoid a problem in the case where | |
1470 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1471 | */ |
4bc87e62 | 1472 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1473 | |
4bc87e62 CS |
1474 | asize = strlen(smack_net_ambient) + 1; |
1475 | ||
1476 | if (cn >= asize) | |
1477 | rc = simple_read_from_buffer(buf, cn, ppos, | |
1478 | smack_net_ambient, asize); | |
1479 | else | |
1480 | rc = -EINVAL; | |
e114e473 | 1481 | |
4bc87e62 | 1482 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1483 | |
1484 | return rc; | |
1485 | } | |
1486 | ||
1487 | /** | |
1488 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1489 | * @file: file pointer, not actually used |
e114e473 CS |
1490 | * @buf: where to get the data from |
1491 | * @count: bytes sent | |
1492 | * @ppos: where to start | |
1493 | * | |
1494 | * Returns number of bytes written or error code, as appropriate | |
1495 | */ | |
1496 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1497 | size_t count, loff_t *ppos) | |
1498 | { | |
4bc87e62 | 1499 | char *oldambient; |
f7112e6c CS |
1500 | char *smack = NULL; |
1501 | char *data; | |
1502 | int rc = count; | |
e114e473 | 1503 | |
1880eff7 | 1504 | if (!smack_privileged(CAP_MAC_ADMIN)) |
e114e473 CS |
1505 | return -EPERM; |
1506 | ||
f7112e6c CS |
1507 | data = kzalloc(count + 1, GFP_KERNEL); |
1508 | if (data == NULL) | |
1509 | return -ENOMEM; | |
e114e473 | 1510 | |
f7112e6c CS |
1511 | if (copy_from_user(data, buf, count) != 0) { |
1512 | rc = -EFAULT; | |
1513 | goto out; | |
1514 | } | |
e114e473 | 1515 | |
f7112e6c CS |
1516 | smack = smk_import(data, count); |
1517 | if (smack == NULL) { | |
1518 | rc = -EINVAL; | |
1519 | goto out; | |
1520 | } | |
e114e473 | 1521 | |
4bc87e62 CS |
1522 | mutex_lock(&smack_ambient_lock); |
1523 | ||
1524 | oldambient = smack_net_ambient; | |
e114e473 | 1525 | smack_net_ambient = smack; |
4bc87e62 CS |
1526 | smk_unlbl_ambient(oldambient); |
1527 | ||
1528 | mutex_unlock(&smack_ambient_lock); | |
e114e473 | 1529 | |
f7112e6c CS |
1530 | out: |
1531 | kfree(data); | |
1532 | return rc; | |
e114e473 CS |
1533 | } |
1534 | ||
1535 | static const struct file_operations smk_ambient_ops = { | |
1536 | .read = smk_read_ambient, | |
1537 | .write = smk_write_ambient, | |
6038f373 | 1538 | .llseek = default_llseek, |
e114e473 CS |
1539 | }; |
1540 | ||
15446235 CS |
1541 | /** |
1542 | * smk_read_onlycap - read() for /smack/onlycap | |
1543 | * @filp: file pointer, not actually used | |
1544 | * @buf: where to put the result | |
1545 | * @cn: maximum to send along | |
1546 | * @ppos: where to start | |
1547 | * | |
1548 | * Returns number of bytes read or error code, as appropriate | |
1549 | */ | |
1550 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, | |
1551 | size_t cn, loff_t *ppos) | |
1552 | { | |
1553 | char *smack = ""; | |
1554 | ssize_t rc = -EINVAL; | |
1555 | int asize; | |
1556 | ||
1557 | if (*ppos != 0) | |
1558 | return 0; | |
1559 | ||
1560 | if (smack_onlycap != NULL) | |
1561 | smack = smack_onlycap; | |
1562 | ||
1563 | asize = strlen(smack) + 1; | |
1564 | ||
1565 | if (cn >= asize) | |
1566 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
1567 | ||
1568 | return rc; | |
1569 | } | |
1570 | ||
1571 | /** | |
1572 | * smk_write_onlycap - write() for /smack/onlycap | |
251a2a95 | 1573 | * @file: file pointer, not actually used |
15446235 CS |
1574 | * @buf: where to get the data from |
1575 | * @count: bytes sent | |
1576 | * @ppos: where to start | |
1577 | * | |
1578 | * Returns number of bytes written or error code, as appropriate | |
1579 | */ | |
1580 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
1581 | size_t count, loff_t *ppos) | |
1582 | { | |
f7112e6c | 1583 | char *data; |
676dac4b | 1584 | char *sp = smk_of_task(current->cred->security); |
f7112e6c | 1585 | int rc = count; |
15446235 | 1586 | |
1880eff7 | 1587 | if (!smack_privileged(CAP_MAC_ADMIN)) |
15446235 CS |
1588 | return -EPERM; |
1589 | ||
1590 | /* | |
1591 | * This can be done using smk_access() but is done | |
1592 | * explicitly for clarity. The smk_access() implementation | |
1593 | * would use smk_access(smack_onlycap, MAY_WRITE) | |
1594 | */ | |
1595 | if (smack_onlycap != NULL && smack_onlycap != sp) | |
1596 | return -EPERM; | |
1597 | ||
f7112e6c CS |
1598 | data = kzalloc(count, GFP_KERNEL); |
1599 | if (data == NULL) | |
1600 | return -ENOMEM; | |
15446235 CS |
1601 | |
1602 | /* | |
1603 | * Should the null string be passed in unset the onlycap value. | |
1604 | * This seems like something to be careful with as usually | |
1605 | * smk_import only expects to return NULL for errors. It | |
1606 | * is usually the case that a nullstring or "\n" would be | |
1607 | * bad to pass to smk_import but in fact this is useful here. | |
f7112e6c CS |
1608 | * |
1609 | * smk_import will also reject a label beginning with '-', | |
1610 | * so "-usecapabilities" will also work. | |
15446235 | 1611 | */ |
f7112e6c CS |
1612 | if (copy_from_user(data, buf, count) != 0) |
1613 | rc = -EFAULT; | |
1614 | else | |
1615 | smack_onlycap = smk_import(data, count); | |
15446235 | 1616 | |
f7112e6c CS |
1617 | kfree(data); |
1618 | return rc; | |
15446235 CS |
1619 | } |
1620 | ||
1621 | static const struct file_operations smk_onlycap_ops = { | |
1622 | .read = smk_read_onlycap, | |
1623 | .write = smk_write_onlycap, | |
6038f373 | 1624 | .llseek = default_llseek, |
15446235 CS |
1625 | }; |
1626 | ||
ecfcc53f EB |
1627 | /** |
1628 | * smk_read_logging - read() for /smack/logging | |
1629 | * @filp: file pointer, not actually used | |
1630 | * @buf: where to put the result | |
1631 | * @cn: maximum to send along | |
1632 | * @ppos: where to start | |
1633 | * | |
1634 | * Returns number of bytes read or error code, as appropriate | |
1635 | */ | |
1636 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
1637 | size_t count, loff_t *ppos) | |
1638 | { | |
1639 | char temp[32]; | |
1640 | ssize_t rc; | |
1641 | ||
1642 | if (*ppos != 0) | |
1643 | return 0; | |
1644 | ||
1645 | sprintf(temp, "%d\n", log_policy); | |
1646 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1647 | return rc; | |
1648 | } | |
1649 | ||
1650 | /** | |
1651 | * smk_write_logging - write() for /smack/logging | |
1652 | * @file: file pointer, not actually used | |
1653 | * @buf: where to get the data from | |
1654 | * @count: bytes sent | |
1655 | * @ppos: where to start | |
1656 | * | |
1657 | * Returns number of bytes written or error code, as appropriate | |
1658 | */ | |
1659 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
1660 | size_t count, loff_t *ppos) | |
1661 | { | |
1662 | char temp[32]; | |
1663 | int i; | |
1664 | ||
1880eff7 | 1665 | if (!smack_privileged(CAP_MAC_ADMIN)) |
ecfcc53f EB |
1666 | return -EPERM; |
1667 | ||
1668 | if (count >= sizeof(temp) || count == 0) | |
1669 | return -EINVAL; | |
1670 | ||
1671 | if (copy_from_user(temp, buf, count) != 0) | |
1672 | return -EFAULT; | |
1673 | ||
1674 | temp[count] = '\0'; | |
1675 | ||
1676 | if (sscanf(temp, "%d", &i) != 1) | |
1677 | return -EINVAL; | |
1678 | if (i < 0 || i > 3) | |
1679 | return -EINVAL; | |
1680 | log_policy = i; | |
1681 | return count; | |
1682 | } | |
1683 | ||
1684 | ||
1685 | ||
1686 | static const struct file_operations smk_logging_ops = { | |
1687 | .read = smk_read_logging, | |
1688 | .write = smk_write_logging, | |
6038f373 | 1689 | .llseek = default_llseek, |
ecfcc53f | 1690 | }; |
7898e1f8 CS |
1691 | |
1692 | /* | |
1693 | * Seq_file read operations for /smack/load-self | |
1694 | */ | |
1695 | ||
1696 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
1697 | { | |
1698 | struct task_smack *tsp = current_security(); | |
1699 | ||
40809565 | 1700 | return smk_seq_start(s, pos, &tsp->smk_rules); |
7898e1f8 CS |
1701 | } |
1702 | ||
1703 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1704 | { | |
1705 | struct task_smack *tsp = current_security(); | |
7898e1f8 | 1706 | |
40809565 | 1707 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
7898e1f8 CS |
1708 | } |
1709 | ||
1710 | static int load_self_seq_show(struct seq_file *s, void *v) | |
1711 | { | |
1712 | struct list_head *list = v; | |
1713 | struct smack_rule *srp = | |
1714 | list_entry(list, struct smack_rule, list); | |
1715 | ||
f7112e6c | 1716 | smk_rule_show(s, srp, SMK_LABELLEN); |
7898e1f8 CS |
1717 | |
1718 | return 0; | |
1719 | } | |
1720 | ||
7898e1f8 CS |
1721 | static const struct seq_operations load_self_seq_ops = { |
1722 | .start = load_self_seq_start, | |
1723 | .next = load_self_seq_next, | |
1724 | .show = load_self_seq_show, | |
40809565 | 1725 | .stop = smk_seq_stop, |
7898e1f8 CS |
1726 | }; |
1727 | ||
1728 | ||
1729 | /** | |
f7112e6c | 1730 | * smk_open_load_self - open() for /smack/load-self2 |
7898e1f8 CS |
1731 | * @inode: inode structure representing file |
1732 | * @file: "load" file pointer | |
1733 | * | |
1734 | * For reading, use load_seq_* seq_file reading operations. | |
1735 | */ | |
1736 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
1737 | { | |
1738 | return seq_open(file, &load_self_seq_ops); | |
1739 | } | |
1740 | ||
1741 | /** | |
1742 | * smk_write_load_self - write() for /smack/load-self | |
1743 | * @file: file pointer, not actually used | |
1744 | * @buf: where to get the data from | |
1745 | * @count: bytes sent | |
1746 | * @ppos: where to start - must be 0 | |
1747 | * | |
1748 | */ | |
1749 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
1750 | size_t count, loff_t *ppos) | |
1751 | { | |
1752 | struct task_smack *tsp = current_security(); | |
1753 | ||
f7112e6c CS |
1754 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
1755 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); | |
7898e1f8 CS |
1756 | } |
1757 | ||
1758 | static const struct file_operations smk_load_self_ops = { | |
1759 | .open = smk_open_load_self, | |
1760 | .read = seq_read, | |
1761 | .llseek = seq_lseek, | |
1762 | .write = smk_write_load_self, | |
1763 | .release = seq_release, | |
1764 | }; | |
828716c2 JS |
1765 | |
1766 | /** | |
f7112e6c | 1767 | * smk_user_access - handle access check transaction |
828716c2 JS |
1768 | * @file: file pointer |
1769 | * @buf: data from user space | |
1770 | * @count: bytes sent | |
1771 | * @ppos: where to start - must be 0 | |
1772 | */ | |
f7112e6c CS |
1773 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
1774 | size_t count, loff_t *ppos, int format) | |
828716c2 JS |
1775 | { |
1776 | struct smack_rule rule; | |
1777 | char *data; | |
f7112e6c | 1778 | char *cod; |
f8859d98 | 1779 | int res; |
828716c2 | 1780 | |
828716c2 JS |
1781 | data = simple_transaction_get(file, buf, count); |
1782 | if (IS_ERR(data)) | |
1783 | return PTR_ERR(data); | |
1784 | ||
f7112e6c CS |
1785 | if (format == SMK_FIXED24_FMT) { |
1786 | if (count < SMK_LOADLEN) | |
1787 | return -EINVAL; | |
1788 | res = smk_parse_rule(data, &rule, 0); | |
1789 | } else { | |
1790 | /* | |
1791 | * Copy the data to make sure the string is terminated. | |
1792 | */ | |
1793 | cod = kzalloc(count + 1, GFP_KERNEL); | |
1794 | if (cod == NULL) | |
1795 | return -ENOMEM; | |
1796 | memcpy(cod, data, count); | |
1797 | cod[count] = '\0'; | |
1798 | res = smk_parse_long_rule(cod, &rule, 0); | |
1799 | kfree(cod); | |
1800 | } | |
1801 | ||
1802 | if (res) | |
828716c2 JS |
1803 | return -EINVAL; |
1804 | ||
f8859d98 JS |
1805 | res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access, |
1806 | NULL); | |
1807 | data[0] = res == 0 ? '1' : '0'; | |
1808 | data[1] = '\0'; | |
828716c2 | 1809 | |
d86b2b61 | 1810 | simple_transaction_set(file, 2); |
f7112e6c CS |
1811 | |
1812 | if (format == SMK_FIXED24_FMT) | |
1813 | return SMK_LOADLEN; | |
1814 | return count; | |
1815 | } | |
1816 | ||
1817 | /** | |
1818 | * smk_write_access - handle access check transaction | |
1819 | * @file: file pointer | |
1820 | * @buf: data from user space | |
1821 | * @count: bytes sent | |
1822 | * @ppos: where to start - must be 0 | |
1823 | */ | |
1824 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
1825 | size_t count, loff_t *ppos) | |
1826 | { | |
1827 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); | |
828716c2 JS |
1828 | } |
1829 | ||
1830 | static const struct file_operations smk_access_ops = { | |
1831 | .write = smk_write_access, | |
1832 | .read = simple_transaction_read, | |
1833 | .release = simple_transaction_release, | |
1834 | .llseek = generic_file_llseek, | |
1835 | }; | |
1836 | ||
f7112e6c CS |
1837 | |
1838 | /* | |
1839 | * Seq_file read operations for /smack/load2 | |
1840 | */ | |
1841 | ||
1842 | static int load2_seq_show(struct seq_file *s, void *v) | |
1843 | { | |
1844 | struct list_head *list = v; | |
1845 | struct smack_master_list *smlp = | |
1846 | list_entry(list, struct smack_master_list, list); | |
1847 | ||
1848 | smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); | |
1849 | ||
1850 | return 0; | |
1851 | } | |
1852 | ||
1853 | static const struct seq_operations load2_seq_ops = { | |
1854 | .start = load2_seq_start, | |
1855 | .next = load2_seq_next, | |
1856 | .show = load2_seq_show, | |
1857 | .stop = smk_seq_stop, | |
1858 | }; | |
1859 | ||
1860 | /** | |
1861 | * smk_open_load2 - open() for /smack/load2 | |
1862 | * @inode: inode structure representing file | |
1863 | * @file: "load2" file pointer | |
1864 | * | |
1865 | * For reading, use load2_seq_* seq_file reading operations. | |
1866 | */ | |
1867 | static int smk_open_load2(struct inode *inode, struct file *file) | |
1868 | { | |
1869 | return seq_open(file, &load2_seq_ops); | |
1870 | } | |
1871 | ||
1872 | /** | |
1873 | * smk_write_load2 - write() for /smack/load2 | |
1874 | * @file: file pointer, not actually used | |
1875 | * @buf: where to get the data from | |
1876 | * @count: bytes sent | |
1877 | * @ppos: where to start - must be 0 | |
1878 | * | |
1879 | */ | |
1880 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, | |
1881 | size_t count, loff_t *ppos) | |
1882 | { | |
1883 | /* | |
1884 | * Must have privilege. | |
1885 | */ | |
1880eff7 | 1886 | if (!smack_privileged(CAP_MAC_ADMIN)) |
f7112e6c CS |
1887 | return -EPERM; |
1888 | ||
1889 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
1890 | SMK_LONG_FMT); | |
1891 | } | |
1892 | ||
1893 | static const struct file_operations smk_load2_ops = { | |
1894 | .open = smk_open_load2, | |
1895 | .read = seq_read, | |
1896 | .llseek = seq_lseek, | |
1897 | .write = smk_write_load2, | |
1898 | .release = seq_release, | |
1899 | }; | |
1900 | ||
1901 | /* | |
1902 | * Seq_file read operations for /smack/load-self2 | |
1903 | */ | |
1904 | ||
1905 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) | |
1906 | { | |
1907 | struct task_smack *tsp = current_security(); | |
1908 | ||
1909 | return smk_seq_start(s, pos, &tsp->smk_rules); | |
1910 | } | |
1911 | ||
1912 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1913 | { | |
1914 | struct task_smack *tsp = current_security(); | |
1915 | ||
1916 | return smk_seq_next(s, v, pos, &tsp->smk_rules); | |
1917 | } | |
1918 | ||
1919 | static int load_self2_seq_show(struct seq_file *s, void *v) | |
1920 | { | |
1921 | struct list_head *list = v; | |
1922 | struct smack_rule *srp = | |
1923 | list_entry(list, struct smack_rule, list); | |
1924 | ||
1925 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
1926 | ||
1927 | return 0; | |
1928 | } | |
1929 | ||
1930 | static const struct seq_operations load_self2_seq_ops = { | |
1931 | .start = load_self2_seq_start, | |
1932 | .next = load_self2_seq_next, | |
1933 | .show = load_self2_seq_show, | |
1934 | .stop = smk_seq_stop, | |
1935 | }; | |
1936 | ||
1937 | /** | |
1938 | * smk_open_load_self2 - open() for /smack/load-self2 | |
1939 | * @inode: inode structure representing file | |
1940 | * @file: "load" file pointer | |
1941 | * | |
1942 | * For reading, use load_seq_* seq_file reading operations. | |
1943 | */ | |
1944 | static int smk_open_load_self2(struct inode *inode, struct file *file) | |
1945 | { | |
1946 | return seq_open(file, &load_self2_seq_ops); | |
1947 | } | |
1948 | ||
1949 | /** | |
1950 | * smk_write_load_self2 - write() for /smack/load-self2 | |
1951 | * @file: file pointer, not actually used | |
1952 | * @buf: where to get the data from | |
1953 | * @count: bytes sent | |
1954 | * @ppos: where to start - must be 0 | |
1955 | * | |
1956 | */ | |
1957 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, | |
1958 | size_t count, loff_t *ppos) | |
1959 | { | |
1960 | struct task_smack *tsp = current_security(); | |
1961 | ||
1962 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, | |
1963 | &tsp->smk_rules_lock, SMK_LONG_FMT); | |
1964 | } | |
1965 | ||
1966 | static const struct file_operations smk_load_self2_ops = { | |
1967 | .open = smk_open_load_self2, | |
1968 | .read = seq_read, | |
1969 | .llseek = seq_lseek, | |
1970 | .write = smk_write_load_self2, | |
1971 | .release = seq_release, | |
1972 | }; | |
1973 | ||
1974 | /** | |
1975 | * smk_write_access2 - handle access check transaction | |
1976 | * @file: file pointer | |
1977 | * @buf: data from user space | |
1978 | * @count: bytes sent | |
1979 | * @ppos: where to start - must be 0 | |
1980 | */ | |
1981 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, | |
1982 | size_t count, loff_t *ppos) | |
1983 | { | |
1984 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); | |
1985 | } | |
1986 | ||
1987 | static const struct file_operations smk_access2_ops = { | |
1988 | .write = smk_write_access2, | |
1989 | .read = simple_transaction_read, | |
1990 | .release = simple_transaction_release, | |
1991 | .llseek = generic_file_llseek, | |
1992 | }; | |
1993 | ||
e114e473 CS |
1994 | /** |
1995 | * smk_fill_super - fill the /smackfs superblock | |
1996 | * @sb: the empty superblock | |
1997 | * @data: unused | |
1998 | * @silent: unused | |
1999 | * | |
2000 | * Fill in the well known entries for /smack | |
2001 | * | |
2002 | * Returns 0 on success, an error code on failure | |
2003 | */ | |
2004 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
2005 | { | |
2006 | int rc; | |
2007 | struct inode *root_inode; | |
2008 | ||
2009 | static struct tree_descr smack_files[] = { | |
7898e1f8 CS |
2010 | [SMK_LOAD] = { |
2011 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
2012 | [SMK_CIPSO] = { | |
2013 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
2014 | [SMK_DOI] = { | |
2015 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
2016 | [SMK_DIRECT] = { | |
2017 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
2018 | [SMK_AMBIENT] = { | |
2019 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
2020 | [SMK_NETLBLADDR] = { | |
2021 | "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, | |
2022 | [SMK_ONLYCAP] = { | |
2023 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
2024 | [SMK_LOGGING] = { | |
2025 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
2026 | [SMK_LOAD_SELF] = { | |
2027 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
828716c2 | 2028 | [SMK_ACCESSES] = { |
0e94ae17 | 2029 | "access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
f7112e6c CS |
2030 | [SMK_MAPPED] = { |
2031 | "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, | |
2032 | [SMK_LOAD2] = { | |
2033 | "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, | |
2034 | [SMK_LOAD_SELF2] = { | |
2035 | "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, | |
2036 | [SMK_ACCESS2] = { | |
2037 | "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, | |
2038 | [SMK_CIPSO2] = { | |
2039 | "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, | |
7898e1f8 CS |
2040 | /* last one */ |
2041 | {""} | |
e114e473 CS |
2042 | }; |
2043 | ||
2044 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
2045 | if (rc != 0) { | |
2046 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
2047 | __func__, rc); | |
2048 | return rc; | |
2049 | } | |
2050 | ||
2051 | root_inode = sb->s_root->d_inode; | |
e114e473 CS |
2052 | |
2053 | return 0; | |
2054 | } | |
2055 | ||
2056 | /** | |
fc14f2fe | 2057 | * smk_mount - get the smackfs superblock |
e114e473 CS |
2058 | * @fs_type: passed along without comment |
2059 | * @flags: passed along without comment | |
2060 | * @dev_name: passed along without comment | |
2061 | * @data: passed along without comment | |
e114e473 CS |
2062 | * |
2063 | * Just passes everything along. | |
2064 | * | |
2065 | * Returns what the lower level code does. | |
2066 | */ | |
fc14f2fe AV |
2067 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
2068 | int flags, const char *dev_name, void *data) | |
e114e473 | 2069 | { |
fc14f2fe | 2070 | return mount_single(fs_type, flags, data, smk_fill_super); |
e114e473 CS |
2071 | } |
2072 | ||
2073 | static struct file_system_type smk_fs_type = { | |
2074 | .name = "smackfs", | |
fc14f2fe | 2075 | .mount = smk_mount, |
e114e473 CS |
2076 | .kill_sb = kill_litter_super, |
2077 | }; | |
2078 | ||
2079 | static struct vfsmount *smackfs_mount; | |
2080 | ||
f7112e6c CS |
2081 | static int __init smk_preset_netlabel(struct smack_known *skp) |
2082 | { | |
2083 | skp->smk_netlabel.domain = skp->smk_known; | |
2084 | skp->smk_netlabel.flags = | |
2085 | NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
2086 | return smk_netlbl_mls(smack_cipso_direct, skp->smk_known, | |
2087 | &skp->smk_netlabel, strlen(skp->smk_known)); | |
2088 | } | |
2089 | ||
e114e473 CS |
2090 | /** |
2091 | * init_smk_fs - get the smackfs superblock | |
2092 | * | |
2093 | * register the smackfs | |
2094 | * | |
076c54c5 AD |
2095 | * Do not register smackfs if Smack wasn't enabled |
2096 | * on boot. We can not put this method normally under the | |
2097 | * smack_init() code path since the security subsystem get | |
2098 | * initialized before the vfs caches. | |
2099 | * | |
2100 | * Returns true if we were not chosen on boot or if | |
2101 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
2102 | */ |
2103 | static int __init init_smk_fs(void) | |
2104 | { | |
2105 | int err; | |
f7112e6c | 2106 | int rc; |
e114e473 | 2107 | |
076c54c5 AD |
2108 | if (!security_module_enable(&smack_ops)) |
2109 | return 0; | |
2110 | ||
e114e473 CS |
2111 | err = register_filesystem(&smk_fs_type); |
2112 | if (!err) { | |
2113 | smackfs_mount = kern_mount(&smk_fs_type); | |
2114 | if (IS_ERR(smackfs_mount)) { | |
2115 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
2116 | err = PTR_ERR(smackfs_mount); | |
2117 | smackfs_mount = NULL; | |
2118 | } | |
2119 | } | |
2120 | ||
e114e473 | 2121 | smk_cipso_doi(); |
4bc87e62 | 2122 | smk_unlbl_ambient(NULL); |
e114e473 | 2123 | |
f7112e6c CS |
2124 | rc = smk_preset_netlabel(&smack_known_floor); |
2125 | if (err == 0 && rc < 0) | |
2126 | err = rc; | |
2127 | rc = smk_preset_netlabel(&smack_known_hat); | |
2128 | if (err == 0 && rc < 0) | |
2129 | err = rc; | |
2130 | rc = smk_preset_netlabel(&smack_known_huh); | |
2131 | if (err == 0 && rc < 0) | |
2132 | err = rc; | |
2133 | rc = smk_preset_netlabel(&smack_known_invalid); | |
2134 | if (err == 0 && rc < 0) | |
2135 | err = rc; | |
2136 | rc = smk_preset_netlabel(&smack_known_star); | |
2137 | if (err == 0 && rc < 0) | |
2138 | err = rc; | |
2139 | rc = smk_preset_netlabel(&smack_known_web); | |
2140 | if (err == 0 && rc < 0) | |
2141 | err = rc; | |
2142 | ||
e114e473 CS |
2143 | return err; |
2144 | } | |
2145 | ||
2146 | __initcall(init_smk_fs); |