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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 | |
f7112e6c CS |
218 | * |
219 | * Returns 0 on success, -1 on failure | |
e114e473 | 220 | */ |
f7112e6c CS |
221 | static int smk_fill_rule(const char *subject, const char *object, |
222 | const char *access, struct smack_rule *rule, | |
223 | int import) | |
e114e473 | 224 | { |
f7112e6c CS |
225 | int rc = -1; |
226 | int done; | |
227 | const char *cp; | |
0e94ae17 | 228 | struct smack_known *skp; |
e114e473 | 229 | |
0e94ae17 | 230 | if (import) { |
f7112e6c | 231 | rule->smk_subject = smk_import(subject, 0); |
0e94ae17 JS |
232 | if (rule->smk_subject == NULL) |
233 | return -1; | |
234 | ||
f7112e6c | 235 | rule->smk_object = smk_import(object, 0); |
0e94ae17 JS |
236 | if (rule->smk_object == NULL) |
237 | return -1; | |
238 | } else { | |
f7112e6c CS |
239 | cp = smk_parse_smack(subject, 0); |
240 | if (cp == NULL) | |
241 | return -1; | |
242 | skp = smk_find_entry(cp); | |
243 | kfree(cp); | |
0e94ae17 JS |
244 | if (skp == NULL) |
245 | return -1; | |
246 | rule->smk_subject = skp->smk_known; | |
247 | ||
f7112e6c CS |
248 | cp = smk_parse_smack(object, 0); |
249 | if (cp == NULL) | |
250 | return -1; | |
251 | skp = smk_find_entry(cp); | |
252 | kfree(cp); | |
0e94ae17 JS |
253 | if (skp == NULL) |
254 | return -1; | |
255 | rule->smk_object = skp->smk_known; | |
256 | } | |
7198e2ee EB |
257 | |
258 | rule->smk_access = 0; | |
e114e473 | 259 | |
f7112e6c CS |
260 | for (cp = access, done = 0; *cp && !done; cp++) { |
261 | switch (*cp) { | |
262 | case '-': | |
263 | break; | |
264 | case 'r': | |
265 | case 'R': | |
266 | rule->smk_access |= MAY_READ; | |
267 | break; | |
268 | case 'w': | |
269 | case 'W': | |
270 | rule->smk_access |= MAY_WRITE; | |
271 | break; | |
272 | case 'x': | |
273 | case 'X': | |
274 | rule->smk_access |= MAY_EXEC; | |
275 | break; | |
276 | case 'a': | |
277 | case 'A': | |
278 | rule->smk_access |= MAY_APPEND; | |
279 | break; | |
280 | case 't': | |
281 | case 'T': | |
282 | rule->smk_access |= MAY_TRANSMUTE; | |
283 | break; | |
284 | default: | |
285 | done = 1; | |
286 | break; | |
287 | } | |
e114e473 | 288 | } |
f7112e6c | 289 | rc = 0; |
e114e473 | 290 | |
f7112e6c CS |
291 | return rc; |
292 | } | |
e114e473 | 293 | |
f7112e6c CS |
294 | /** |
295 | * smk_parse_rule - parse Smack rule from load string | |
296 | * @data: string to be parsed whose size is SMK_LOADLEN | |
297 | * @rule: Smack rule | |
298 | * @import: if non-zero, import labels | |
299 | * | |
300 | * Returns 0 on success, -1 on errors. | |
301 | */ | |
302 | static int smk_parse_rule(const char *data, struct smack_rule *rule, int import) | |
303 | { | |
304 | int rc; | |
e114e473 | 305 | |
f7112e6c CS |
306 | rc = smk_fill_rule(data, data + SMK_LABELLEN, |
307 | data + SMK_LABELLEN + SMK_LABELLEN, rule, import); | |
308 | return rc; | |
309 | } | |
e114e473 | 310 | |
f7112e6c CS |
311 | /** |
312 | * smk_parse_long_rule - parse Smack rule from rule string | |
313 | * @data: string to be parsed, null terminated | |
314 | * @rule: Smack rule | |
315 | * @import: if non-zero, import labels | |
316 | * | |
317 | * Returns 0 on success, -1 on failure | |
318 | */ | |
319 | static int smk_parse_long_rule(const char *data, struct smack_rule *rule, | |
320 | int import) | |
321 | { | |
322 | char *subject; | |
323 | char *object; | |
324 | char *access; | |
325 | int datalen; | |
326 | int rc = -1; | |
5c6d1125 | 327 | |
f7112e6c CS |
328 | /* |
329 | * This is probably inefficient, but safe. | |
330 | */ | |
331 | datalen = strlen(data); | |
332 | subject = kzalloc(datalen, GFP_KERNEL); | |
333 | if (subject == NULL) | |
334 | return -1; | |
335 | object = kzalloc(datalen, GFP_KERNEL); | |
336 | if (object == NULL) | |
337 | goto free_out_s; | |
338 | access = kzalloc(datalen, GFP_KERNEL); | |
339 | if (access == NULL) | |
340 | goto free_out_o; | |
341 | ||
342 | if (sscanf(data, "%s %s %s", subject, object, access) == 3) | |
343 | rc = smk_fill_rule(subject, object, access, rule, import); | |
344 | ||
345 | kfree(access); | |
346 | free_out_o: | |
347 | kfree(object); | |
348 | free_out_s: | |
349 | kfree(subject); | |
350 | return rc; | |
828716c2 JS |
351 | } |
352 | ||
f7112e6c CS |
353 | #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
354 | #define SMK_LONG_FMT 1 /* Variable long label format */ | |
828716c2 | 355 | /** |
f7112e6c | 356 | * smk_write_rules_list - write() for any /smack rule file |
828716c2 JS |
357 | * @file: file pointer, not actually used |
358 | * @buf: where to get the data from | |
359 | * @count: bytes sent | |
360 | * @ppos: where to start - must be 0 | |
361 | * @rule_list: the list of rules to write to | |
362 | * @rule_lock: lock for the rule list | |
f7112e6c | 363 | * @format: /smack/load or /smack/load2 format. |
828716c2 JS |
364 | * |
365 | * Get one smack access rule from above. | |
f7112e6c CS |
366 | * The format for SMK_LONG_FMT is: |
367 | * "subject<whitespace>object<whitespace>access[<whitespace>...]" | |
368 | * The format for SMK_FIXED24_FMT is exactly: | |
369 | * "subject object rwxat" | |
828716c2 | 370 | */ |
f7112e6c CS |
371 | static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
372 | size_t count, loff_t *ppos, | |
373 | struct list_head *rule_list, | |
374 | struct mutex *rule_lock, int format) | |
828716c2 | 375 | { |
272cd7a8 CS |
376 | struct smack_master_list *smlp; |
377 | struct smack_known *skp; | |
828716c2 JS |
378 | struct smack_rule *rule; |
379 | char *data; | |
f7112e6c | 380 | int datalen; |
828716c2 | 381 | int rc = -EINVAL; |
272cd7a8 | 382 | int load = 0; |
828716c2 JS |
383 | |
384 | /* | |
385 | * No partial writes. | |
386 | * Enough data must be present. | |
387 | */ | |
388 | if (*ppos != 0) | |
389 | return -EINVAL; | |
828716c2 | 390 | |
f7112e6c CS |
391 | if (format == SMK_FIXED24_FMT) { |
392 | /* | |
393 | * Minor hack for backward compatibility | |
394 | */ | |
395 | if (count != SMK_OLOADLEN && count != SMK_LOADLEN) | |
396 | return -EINVAL; | |
397 | datalen = SMK_LOADLEN; | |
398 | } else | |
399 | datalen = count + 1; | |
400 | ||
401 | data = kzalloc(datalen, GFP_KERNEL); | |
828716c2 JS |
402 | if (data == NULL) |
403 | return -ENOMEM; | |
404 | ||
405 | if (copy_from_user(data, buf, count) != 0) { | |
406 | rc = -EFAULT; | |
407 | goto out; | |
408 | } | |
409 | ||
828716c2 JS |
410 | rule = kzalloc(sizeof(*rule), GFP_KERNEL); |
411 | if (rule == NULL) { | |
412 | rc = -ENOMEM; | |
413 | goto out; | |
414 | } | |
415 | ||
f7112e6c CS |
416 | if (format == SMK_LONG_FMT) { |
417 | /* | |
418 | * Be sure the data string is terminated. | |
419 | */ | |
420 | data[count] = '\0'; | |
421 | if (smk_parse_long_rule(data, rule, 1)) | |
422 | goto out_free_rule; | |
423 | } else { | |
424 | /* | |
425 | * More on the minor hack for backward compatibility | |
426 | */ | |
427 | if (count == (SMK_OLOADLEN)) | |
428 | data[SMK_OLOADLEN] = '-'; | |
429 | if (smk_parse_rule(data, rule, 1)) | |
430 | goto out_free_rule; | |
431 | } | |
432 | ||
828716c2 | 433 | |
272cd7a8 CS |
434 | if (rule_list == NULL) { |
435 | load = 1; | |
436 | skp = smk_find_entry(rule->smk_subject); | |
437 | rule_list = &skp->smk_rules; | |
438 | rule_lock = &skp->smk_rules_lock; | |
439 | } | |
440 | ||
7898e1f8 CS |
441 | rc = count; |
442 | /* | |
f7112e6c | 443 | * If this is a global as opposed to self and a new rule |
40809565 | 444 | * it needs to get added for reporting. |
7898e1f8 CS |
445 | * smk_set_access returns true if there was already a rule |
446 | * for the subject/object pair, and false if it was new. | |
447 | */ | |
f7112e6c CS |
448 | if (!smk_set_access(rule, rule_list, rule_lock)) { |
449 | if (load) { | |
450 | smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); | |
451 | if (smlp != NULL) { | |
452 | smlp->smk_rule = rule; | |
453 | list_add_rcu(&smlp->list, &smack_rule_list); | |
454 | } else | |
455 | rc = -ENOMEM; | |
456 | } | |
7898e1f8 | 457 | goto out; |
272cd7a8 | 458 | } |
e114e473 | 459 | |
7198e2ee EB |
460 | out_free_rule: |
461 | kfree(rule); | |
e114e473 CS |
462 | out: |
463 | kfree(data); | |
464 | return rc; | |
465 | } | |
466 | ||
7898e1f8 | 467 | /* |
40809565 | 468 | * Core logic for smackfs seq list operations. |
7898e1f8 CS |
469 | */ |
470 | ||
40809565 CS |
471 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
472 | struct list_head *head) | |
7898e1f8 | 473 | { |
272cd7a8 CS |
474 | struct list_head *list; |
475 | ||
476 | /* | |
477 | * This is 0 the first time through. | |
478 | */ | |
479 | if (s->index == 0) | |
40809565 | 480 | s->private = head; |
272cd7a8 CS |
481 | |
482 | if (s->private == NULL) | |
7898e1f8 | 483 | return NULL; |
272cd7a8 CS |
484 | |
485 | list = s->private; | |
486 | if (list_empty(list)) | |
7898e1f8 | 487 | return NULL; |
272cd7a8 CS |
488 | |
489 | if (s->index == 0) | |
490 | return list->next; | |
491 | return list; | |
7898e1f8 CS |
492 | } |
493 | ||
40809565 CS |
494 | static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
495 | struct list_head *head) | |
7898e1f8 CS |
496 | { |
497 | struct list_head *list = v; | |
498 | ||
40809565 | 499 | if (list_is_last(list, head)) { |
272cd7a8 | 500 | s->private = NULL; |
7898e1f8 CS |
501 | return NULL; |
502 | } | |
272cd7a8 | 503 | s->private = list->next; |
7898e1f8 CS |
504 | return list->next; |
505 | } | |
506 | ||
40809565 CS |
507 | static void smk_seq_stop(struct seq_file *s, void *v) |
508 | { | |
509 | /* No-op */ | |
510 | } | |
511 | ||
f7112e6c | 512 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
40809565 | 513 | { |
f7112e6c CS |
514 | /* |
515 | * Don't show any rules with label names too long for | |
516 | * interface file (/smack/load or /smack/load2) | |
517 | * because you should expect to be able to write | |
518 | * anything you read back. | |
519 | */ | |
520 | if (strlen(srp->smk_subject) >= max || strlen(srp->smk_object) >= max) | |
521 | return; | |
7898e1f8 | 522 | |
f7112e6c | 523 | seq_printf(s, "%s %s", srp->smk_subject, srp->smk_object); |
7898e1f8 CS |
524 | |
525 | seq_putc(s, ' '); | |
526 | ||
527 | if (srp->smk_access & MAY_READ) | |
528 | seq_putc(s, 'r'); | |
529 | if (srp->smk_access & MAY_WRITE) | |
530 | seq_putc(s, 'w'); | |
531 | if (srp->smk_access & MAY_EXEC) | |
532 | seq_putc(s, 'x'); | |
533 | if (srp->smk_access & MAY_APPEND) | |
534 | seq_putc(s, 'a'); | |
535 | if (srp->smk_access & MAY_TRANSMUTE) | |
536 | seq_putc(s, 't'); | |
537 | if (srp->smk_access == 0) | |
538 | seq_putc(s, '-'); | |
539 | ||
540 | seq_putc(s, '\n'); | |
f7112e6c CS |
541 | } |
542 | ||
543 | /* | |
544 | * Seq_file read operations for /smack/load | |
545 | */ | |
546 | ||
547 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) | |
548 | { | |
549 | return smk_seq_start(s, pos, &smack_rule_list); | |
550 | } | |
551 | ||
552 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
553 | { | |
554 | return smk_seq_next(s, v, pos, &smack_rule_list); | |
555 | } | |
556 | ||
557 | static int load_seq_show(struct seq_file *s, void *v) | |
558 | { | |
559 | struct list_head *list = v; | |
560 | struct smack_master_list *smlp = | |
561 | list_entry(list, struct smack_master_list, list); | |
562 | ||
563 | smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); | |
7898e1f8 CS |
564 | |
565 | return 0; | |
566 | } | |
567 | ||
7898e1f8 | 568 | static const struct seq_operations load_seq_ops = { |
f7112e6c CS |
569 | .start = load2_seq_start, |
570 | .next = load2_seq_next, | |
7898e1f8 | 571 | .show = load_seq_show, |
40809565 | 572 | .stop = smk_seq_stop, |
7898e1f8 CS |
573 | }; |
574 | ||
575 | /** | |
576 | * smk_open_load - open() for /smack/load | |
577 | * @inode: inode structure representing file | |
578 | * @file: "load" file pointer | |
579 | * | |
580 | * For reading, use load_seq_* seq_file reading operations. | |
581 | */ | |
582 | static int smk_open_load(struct inode *inode, struct file *file) | |
583 | { | |
584 | return seq_open(file, &load_seq_ops); | |
585 | } | |
586 | ||
587 | /** | |
588 | * smk_write_load - write() for /smack/load | |
589 | * @file: file pointer, not actually used | |
590 | * @buf: where to get the data from | |
591 | * @count: bytes sent | |
592 | * @ppos: where to start - must be 0 | |
593 | * | |
594 | */ | |
595 | static ssize_t smk_write_load(struct file *file, const char __user *buf, | |
596 | size_t count, loff_t *ppos) | |
597 | { | |
598 | ||
599 | /* | |
600 | * Must have privilege. | |
601 | * No partial writes. | |
602 | * Enough data must be present. | |
603 | */ | |
604 | if (!capable(CAP_MAC_ADMIN)) | |
605 | return -EPERM; | |
606 | ||
f7112e6c CS |
607 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
608 | SMK_FIXED24_FMT); | |
7898e1f8 CS |
609 | } |
610 | ||
e114e473 CS |
611 | static const struct file_operations smk_load_ops = { |
612 | .open = smk_open_load, | |
613 | .read = seq_read, | |
614 | .llseek = seq_lseek, | |
615 | .write = smk_write_load, | |
cb622bbb | 616 | .release = seq_release, |
e114e473 CS |
617 | }; |
618 | ||
619 | /** | |
620 | * smk_cipso_doi - initialize the CIPSO domain | |
621 | */ | |
30aa4faf | 622 | static void smk_cipso_doi(void) |
e114e473 CS |
623 | { |
624 | int rc; | |
625 | struct cipso_v4_doi *doip; | |
6d3dc07c | 626 | struct netlbl_audit nai; |
e114e473 | 627 | |
6d3dc07c | 628 | smk_netlabel_audit_set(&nai); |
4bc87e62 | 629 | |
6d3dc07c | 630 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
e114e473 CS |
631 | if (rc != 0) |
632 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
633 | __func__, __LINE__, rc); | |
634 | ||
635 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); | |
636 | if (doip == NULL) | |
637 | panic("smack: Failed to initialize cipso DOI.\n"); | |
638 | doip->map.std = NULL; | |
639 | doip->doi = smk_cipso_doi_value; | |
640 | doip->type = CIPSO_V4_MAP_PASS; | |
641 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; | |
642 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) | |
643 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; | |
644 | ||
6d3dc07c | 645 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
b1edeb10 | 646 | if (rc != 0) { |
6c2e8ac0 PM |
647 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
648 | __func__, __LINE__, rc); | |
649 | kfree(doip); | |
650 | return; | |
651 | } | |
6d3dc07c | 652 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
6c2e8ac0 PM |
653 | if (rc != 0) { |
654 | printk(KERN_WARNING "%s:%d map add rc = %d\n", | |
e114e473 | 655 | __func__, __LINE__, rc); |
b1edeb10 | 656 | kfree(doip); |
6c2e8ac0 | 657 | return; |
b1edeb10 | 658 | } |
e114e473 CS |
659 | } |
660 | ||
4bc87e62 CS |
661 | /** |
662 | * smk_unlbl_ambient - initialize the unlabeled domain | |
251a2a95 | 663 | * @oldambient: previous domain string |
4bc87e62 | 664 | */ |
30aa4faf | 665 | static void smk_unlbl_ambient(char *oldambient) |
4bc87e62 CS |
666 | { |
667 | int rc; | |
6d3dc07c | 668 | struct netlbl_audit nai; |
4bc87e62 | 669 | |
6d3dc07c | 670 | smk_netlabel_audit_set(&nai); |
4bc87e62 CS |
671 | |
672 | if (oldambient != NULL) { | |
6d3dc07c | 673 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
4bc87e62 CS |
674 | if (rc != 0) |
675 | printk(KERN_WARNING "%s:%d remove rc = %d\n", | |
676 | __func__, __LINE__, rc); | |
677 | } | |
f7112e6c CS |
678 | if (smack_net_ambient == NULL) |
679 | smack_net_ambient = smack_known_floor.smk_known; | |
4bc87e62 | 680 | |
6d3dc07c CS |
681 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET, |
682 | NULL, NULL, &nai); | |
4bc87e62 CS |
683 | if (rc != 0) |
684 | printk(KERN_WARNING "%s:%d add rc = %d\n", | |
685 | __func__, __LINE__, rc); | |
686 | } | |
687 | ||
e114e473 CS |
688 | /* |
689 | * Seq_file read operations for /smack/cipso | |
690 | */ | |
691 | ||
692 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) | |
693 | { | |
40809565 | 694 | return smk_seq_start(s, pos, &smack_known_list); |
e114e473 CS |
695 | } |
696 | ||
697 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
698 | { | |
40809565 | 699 | return smk_seq_next(s, v, pos, &smack_known_list); |
e114e473 CS |
700 | } |
701 | ||
702 | /* | |
703 | * Print cipso labels in format: | |
704 | * label level[/cat[,cat]] | |
705 | */ | |
706 | static int cipso_seq_show(struct seq_file *s, void *v) | |
707 | { | |
7198e2ee EB |
708 | struct list_head *list = v; |
709 | struct smack_known *skp = | |
710 | list_entry(list, struct smack_known, list); | |
f7112e6c | 711 | struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
e114e473 | 712 | char sep = '/'; |
e114e473 | 713 | int i; |
e114e473 | 714 | |
f7112e6c CS |
715 | /* |
716 | * Don't show a label that could not have been set using | |
717 | * /smack/cipso. This is in support of the notion that | |
718 | * anything read from /smack/cipso ought to be writeable | |
719 | * to /smack/cipso. | |
720 | * | |
721 | * /smack/cipso2 should be used instead. | |
722 | */ | |
723 | if (strlen(skp->smk_known) >= SMK_LABELLEN) | |
e114e473 CS |
724 | return 0; |
725 | ||
f7112e6c | 726 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
e114e473 | 727 | |
f7112e6c CS |
728 | for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; |
729 | i = netlbl_secattr_catmap_walk(cmp, i + 1)) { | |
730 | seq_printf(s, "%c%d", sep, i); | |
731 | sep = ','; | |
732 | } | |
e114e473 CS |
733 | |
734 | seq_putc(s, '\n'); | |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
88e9d34c | 739 | static const struct seq_operations cipso_seq_ops = { |
e114e473 | 740 | .start = cipso_seq_start, |
e114e473 CS |
741 | .next = cipso_seq_next, |
742 | .show = cipso_seq_show, | |
40809565 | 743 | .stop = smk_seq_stop, |
e114e473 CS |
744 | }; |
745 | ||
746 | /** | |
747 | * smk_open_cipso - open() for /smack/cipso | |
748 | * @inode: inode structure representing file | |
749 | * @file: "cipso" file pointer | |
750 | * | |
751 | * Connect our cipso_seq_* operations with /smack/cipso | |
752 | * file_operations | |
753 | */ | |
754 | static int smk_open_cipso(struct inode *inode, struct file *file) | |
755 | { | |
756 | return seq_open(file, &cipso_seq_ops); | |
757 | } | |
758 | ||
759 | /** | |
f7112e6c | 760 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
251a2a95 | 761 | * @file: file pointer, not actually used |
e114e473 CS |
762 | * @buf: where to get the data from |
763 | * @count: bytes sent | |
764 | * @ppos: where to start | |
f7112e6c | 765 | * @format: /smack/cipso or /smack/cipso2 |
e114e473 CS |
766 | * |
767 | * Accepts only one cipso rule per write call. | |
768 | * Returns number of bytes written or error code, as appropriate | |
769 | */ | |
f7112e6c CS |
770 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
771 | size_t count, loff_t *ppos, int format) | |
e114e473 CS |
772 | { |
773 | struct smack_known *skp; | |
f7112e6c CS |
774 | struct netlbl_lsm_secattr ncats; |
775 | char mapcatset[SMK_CIPSOLEN]; | |
e114e473 | 776 | int maplevel; |
f7112e6c | 777 | unsigned int cat; |
e114e473 CS |
778 | int catlen; |
779 | ssize_t rc = -EINVAL; | |
780 | char *data = NULL; | |
781 | char *rule; | |
782 | int ret; | |
783 | int i; | |
784 | ||
785 | /* | |
786 | * Must have privilege. | |
787 | * No partial writes. | |
788 | * Enough data must be present. | |
789 | */ | |
790 | if (!capable(CAP_MAC_ADMIN)) | |
791 | return -EPERM; | |
792 | if (*ppos != 0) | |
793 | return -EINVAL; | |
f7112e6c CS |
794 | if (format == SMK_FIXED24_FMT && |
795 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) | |
e114e473 CS |
796 | return -EINVAL; |
797 | ||
798 | data = kzalloc(count + 1, GFP_KERNEL); | |
799 | if (data == NULL) | |
800 | return -ENOMEM; | |
801 | ||
802 | if (copy_from_user(data, buf, count) != 0) { | |
803 | rc = -EFAULT; | |
804 | goto unlockedout; | |
805 | } | |
806 | ||
807 | data[count] = '\0'; | |
808 | rule = data; | |
809 | /* | |
810 | * Only allow one writer at a time. Writes should be | |
811 | * quite rare and small in any case. | |
812 | */ | |
813 | mutex_lock(&smack_cipso_lock); | |
814 | ||
815 | skp = smk_import_entry(rule, 0); | |
816 | if (skp == NULL) | |
817 | goto out; | |
818 | ||
f7112e6c CS |
819 | if (format == SMK_FIXED24_FMT) |
820 | rule += SMK_LABELLEN; | |
821 | else | |
822 | rule += strlen(skp->smk_known); | |
823 | ||
e114e473 CS |
824 | ret = sscanf(rule, "%d", &maplevel); |
825 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) | |
826 | goto out; | |
827 | ||
828 | rule += SMK_DIGITLEN; | |
829 | ret = sscanf(rule, "%d", &catlen); | |
830 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) | |
831 | goto out; | |
832 | ||
f7112e6c CS |
833 | if (format == SMK_FIXED24_FMT && |
834 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) | |
e114e473 CS |
835 | goto out; |
836 | ||
837 | memset(mapcatset, 0, sizeof(mapcatset)); | |
838 | ||
839 | for (i = 0; i < catlen; i++) { | |
840 | rule += SMK_DIGITLEN; | |
f7112e6c | 841 | ret = sscanf(rule, "%u", &cat); |
e114e473 CS |
842 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) |
843 | goto out; | |
844 | ||
845 | smack_catset_bit(cat, mapcatset); | |
846 | } | |
847 | ||
f7112e6c CS |
848 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
849 | if (rc >= 0) { | |
850 | netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat); | |
851 | skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; | |
852 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; | |
853 | rc = count; | |
e114e473 CS |
854 | } |
855 | ||
e114e473 CS |
856 | out: |
857 | mutex_unlock(&smack_cipso_lock); | |
858 | unlockedout: | |
859 | kfree(data); | |
860 | return rc; | |
861 | } | |
862 | ||
f7112e6c CS |
863 | /** |
864 | * smk_write_cipso - write() for /smack/cipso | |
865 | * @file: file pointer, not actually used | |
866 | * @buf: where to get the data from | |
867 | * @count: bytes sent | |
868 | * @ppos: where to start | |
869 | * | |
870 | * Accepts only one cipso rule per write call. | |
871 | * Returns number of bytes written or error code, as appropriate | |
872 | */ | |
873 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, | |
874 | size_t count, loff_t *ppos) | |
875 | { | |
876 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); | |
877 | } | |
878 | ||
e114e473 CS |
879 | static const struct file_operations smk_cipso_ops = { |
880 | .open = smk_open_cipso, | |
881 | .read = seq_read, | |
882 | .llseek = seq_lseek, | |
883 | .write = smk_write_cipso, | |
884 | .release = seq_release, | |
885 | }; | |
886 | ||
f7112e6c CS |
887 | /* |
888 | * Seq_file read operations for /smack/cipso2 | |
889 | */ | |
890 | ||
891 | /* | |
892 | * Print cipso labels in format: | |
893 | * label level[/cat[,cat]] | |
894 | */ | |
895 | static int cipso2_seq_show(struct seq_file *s, void *v) | |
896 | { | |
897 | struct list_head *list = v; | |
898 | struct smack_known *skp = | |
899 | list_entry(list, struct smack_known, list); | |
900 | struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; | |
901 | char sep = '/'; | |
902 | int i; | |
903 | ||
904 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); | |
905 | ||
906 | for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; | |
907 | i = netlbl_secattr_catmap_walk(cmp, i + 1)) { | |
908 | seq_printf(s, "%c%d", sep, i); | |
909 | sep = ','; | |
910 | } | |
911 | ||
912 | seq_putc(s, '\n'); | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | static const struct seq_operations cipso2_seq_ops = { | |
918 | .start = cipso_seq_start, | |
919 | .next = cipso_seq_next, | |
920 | .show = cipso2_seq_show, | |
921 | .stop = smk_seq_stop, | |
922 | }; | |
923 | ||
924 | /** | |
925 | * smk_open_cipso2 - open() for /smack/cipso2 | |
926 | * @inode: inode structure representing file | |
927 | * @file: "cipso2" file pointer | |
928 | * | |
929 | * Connect our cipso_seq_* operations with /smack/cipso2 | |
930 | * file_operations | |
931 | */ | |
932 | static int smk_open_cipso2(struct inode *inode, struct file *file) | |
933 | { | |
934 | return seq_open(file, &cipso2_seq_ops); | |
935 | } | |
936 | ||
937 | /** | |
938 | * smk_write_cipso2 - write() for /smack/cipso2 | |
939 | * @file: file pointer, not actually used | |
940 | * @buf: where to get the data from | |
941 | * @count: bytes sent | |
942 | * @ppos: where to start | |
943 | * | |
944 | * Accepts only one cipso rule per write call. | |
945 | * Returns number of bytes written or error code, as appropriate | |
946 | */ | |
947 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, | |
948 | size_t count, loff_t *ppos) | |
949 | { | |
950 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); | |
951 | } | |
952 | ||
953 | static const struct file_operations smk_cipso2_ops = { | |
954 | .open = smk_open_cipso2, | |
955 | .read = seq_read, | |
956 | .llseek = seq_lseek, | |
957 | .write = smk_write_cipso2, | |
958 | .release = seq_release, | |
959 | }; | |
960 | ||
6d3dc07c CS |
961 | /* |
962 | * Seq_file read operations for /smack/netlabel | |
963 | */ | |
964 | ||
965 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) | |
966 | { | |
40809565 | 967 | return smk_seq_start(s, pos, &smk_netlbladdr_list); |
6d3dc07c CS |
968 | } |
969 | ||
970 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
971 | { | |
40809565 | 972 | return smk_seq_next(s, v, pos, &smk_netlbladdr_list); |
6d3dc07c | 973 | } |
6d3dc07c CS |
974 | #define BEBITS (sizeof(__be32) * 8) |
975 | ||
976 | /* | |
977 | * Print host/label pairs | |
978 | */ | |
979 | static int netlbladdr_seq_show(struct seq_file *s, void *v) | |
980 | { | |
7198e2ee EB |
981 | struct list_head *list = v; |
982 | struct smk_netlbladdr *skp = | |
983 | list_entry(list, struct smk_netlbladdr, list); | |
6d3dc07c | 984 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
113a0e45 | 985 | int maskn; |
986 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); | |
6d3dc07c | 987 | |
113a0e45 | 988 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
6d3dc07c CS |
989 | |
990 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", | |
991 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
88e9d34c | 996 | static const struct seq_operations netlbladdr_seq_ops = { |
6d3dc07c | 997 | .start = netlbladdr_seq_start, |
6d3dc07c CS |
998 | .next = netlbladdr_seq_next, |
999 | .show = netlbladdr_seq_show, | |
40809565 | 1000 | .stop = smk_seq_stop, |
6d3dc07c CS |
1001 | }; |
1002 | ||
1003 | /** | |
1004 | * smk_open_netlbladdr - open() for /smack/netlabel | |
1005 | * @inode: inode structure representing file | |
1006 | * @file: "netlabel" file pointer | |
1007 | * | |
1008 | * Connect our netlbladdr_seq_* operations with /smack/netlabel | |
1009 | * file_operations | |
1010 | */ | |
1011 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) | |
1012 | { | |
1013 | return seq_open(file, &netlbladdr_seq_ops); | |
1014 | } | |
1015 | ||
113a0e45 | 1016 | /** |
1017 | * smk_netlbladdr_insert | |
1018 | * @new : netlabel to insert | |
1019 | * | |
1020 | * This helper insert netlabel in the smack_netlbladdrs list | |
1021 | * sorted by netmask length (longest to smallest) | |
7198e2ee EB |
1022 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
1023 | * | |
113a0e45 | 1024 | */ |
1025 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) | |
1026 | { | |
7198e2ee | 1027 | struct smk_netlbladdr *m, *m_next; |
113a0e45 | 1028 | |
7198e2ee EB |
1029 | if (list_empty(&smk_netlbladdr_list)) { |
1030 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 1031 | return; |
1032 | } | |
1033 | ||
05725f7e JP |
1034 | m = list_entry_rcu(smk_netlbladdr_list.next, |
1035 | struct smk_netlbladdr, list); | |
7198e2ee | 1036 | |
113a0e45 | 1037 | /* the comparison '>' is a bit hacky, but works */ |
7198e2ee EB |
1038 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
1039 | list_add_rcu(&new->list, &smk_netlbladdr_list); | |
113a0e45 | 1040 | return; |
1041 | } | |
7198e2ee EB |
1042 | |
1043 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { | |
1044 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { | |
1045 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 1046 | return; |
1047 | } | |
05725f7e JP |
1048 | m_next = list_entry_rcu(m->list.next, |
1049 | struct smk_netlbladdr, list); | |
7198e2ee EB |
1050 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { |
1051 | list_add_rcu(&new->list, &m->list); | |
113a0e45 | 1052 | return; |
1053 | } | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | ||
6d3dc07c CS |
1058 | /** |
1059 | * smk_write_netlbladdr - write() for /smack/netlabel | |
251a2a95 | 1060 | * @file: file pointer, not actually used |
6d3dc07c CS |
1061 | * @buf: where to get the data from |
1062 | * @count: bytes sent | |
1063 | * @ppos: where to start | |
1064 | * | |
1065 | * Accepts only one netlbladdr per write call. | |
1066 | * Returns number of bytes written or error code, as appropriate | |
1067 | */ | |
1068 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, | |
1069 | size_t count, loff_t *ppos) | |
1070 | { | |
1071 | struct smk_netlbladdr *skp; | |
1072 | struct sockaddr_in newname; | |
f7112e6c | 1073 | char *smack; |
6d3dc07c | 1074 | char *sp; |
f7112e6c | 1075 | char *data; |
6d3dc07c CS |
1076 | char *host = (char *)&newname.sin_addr.s_addr; |
1077 | int rc; | |
1078 | struct netlbl_audit audit_info; | |
1079 | struct in_addr mask; | |
1080 | unsigned int m; | |
7198e2ee | 1081 | int found; |
113a0e45 | 1082 | u32 mask_bits = (1<<31); |
6d3dc07c | 1083 | __be32 nsa; |
113a0e45 | 1084 | u32 temp_mask; |
6d3dc07c CS |
1085 | |
1086 | /* | |
1087 | * Must have privilege. | |
1088 | * No partial writes. | |
1089 | * Enough data must be present. | |
1090 | * "<addr/mask, as a.b.c.d/e><space><label>" | |
1091 | * "<addr, as a.b.c.d><space><label>" | |
1092 | */ | |
1093 | if (!capable(CAP_MAC_ADMIN)) | |
1094 | return -EPERM; | |
1095 | if (*ppos != 0) | |
1096 | return -EINVAL; | |
f7112e6c | 1097 | if (count < SMK_NETLBLADDRMIN) |
6d3dc07c | 1098 | return -EINVAL; |
f7112e6c CS |
1099 | |
1100 | data = kzalloc(count + 1, GFP_KERNEL); | |
1101 | if (data == NULL) | |
1102 | return -ENOMEM; | |
1103 | ||
1104 | if (copy_from_user(data, buf, count) != 0) { | |
1105 | rc = -EFAULT; | |
1106 | goto free_data_out; | |
1107 | } | |
1108 | ||
1109 | smack = kzalloc(count + 1, GFP_KERNEL); | |
1110 | if (smack == NULL) { | |
1111 | rc = -ENOMEM; | |
1112 | goto free_data_out; | |
1113 | } | |
6d3dc07c CS |
1114 | |
1115 | data[count] = '\0'; | |
1116 | ||
1117 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", | |
1118 | &host[0], &host[1], &host[2], &host[3], &m, smack); | |
1119 | if (rc != 6) { | |
1120 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", | |
1121 | &host[0], &host[1], &host[2], &host[3], smack); | |
f7112e6c CS |
1122 | if (rc != 5) { |
1123 | rc = -EINVAL; | |
1124 | goto free_out; | |
1125 | } | |
6d3dc07c CS |
1126 | m = BEBITS; |
1127 | } | |
f7112e6c CS |
1128 | if (m > BEBITS) { |
1129 | rc = -EINVAL; | |
1130 | goto free_out; | |
1131 | } | |
6d3dc07c | 1132 | |
f7112e6c CS |
1133 | /* |
1134 | * If smack begins with '-', it is an option, don't import it | |
1135 | */ | |
4303154e EB |
1136 | if (smack[0] != '-') { |
1137 | sp = smk_import(smack, 0); | |
f7112e6c CS |
1138 | if (sp == NULL) { |
1139 | rc = -EINVAL; | |
1140 | goto free_out; | |
1141 | } | |
4303154e EB |
1142 | } else { |
1143 | /* check known options */ | |
1144 | if (strcmp(smack, smack_cipso_option) == 0) | |
1145 | sp = (char *)smack_cipso_option; | |
f7112e6c CS |
1146 | else { |
1147 | rc = -EINVAL; | |
1148 | goto free_out; | |
1149 | } | |
4303154e | 1150 | } |
6d3dc07c | 1151 | |
113a0e45 | 1152 | for (temp_mask = 0; m > 0; m--) { |
1153 | temp_mask |= mask_bits; | |
1154 | mask_bits >>= 1; | |
6d3dc07c | 1155 | } |
113a0e45 | 1156 | mask.s_addr = cpu_to_be32(temp_mask); |
1157 | ||
1158 | newname.sin_addr.s_addr &= mask.s_addr; | |
6d3dc07c CS |
1159 | /* |
1160 | * Only allow one writer at a time. Writes should be | |
1161 | * quite rare and small in any case. | |
1162 | */ | |
1163 | mutex_lock(&smk_netlbladdr_lock); | |
1164 | ||
1165 | nsa = newname.sin_addr.s_addr; | |
113a0e45 | 1166 | /* try to find if the prefix is already in the list */ |
7198e2ee EB |
1167 | found = 0; |
1168 | list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { | |
6d3dc07c | 1169 | if (skp->smk_host.sin_addr.s_addr == nsa && |
7198e2ee EB |
1170 | skp->smk_mask.s_addr == mask.s_addr) { |
1171 | found = 1; | |
6d3dc07c | 1172 | break; |
7198e2ee EB |
1173 | } |
1174 | } | |
6d3dc07c CS |
1175 | smk_netlabel_audit_set(&audit_info); |
1176 | ||
7198e2ee | 1177 | if (found == 0) { |
6d3dc07c CS |
1178 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
1179 | if (skp == NULL) | |
1180 | rc = -ENOMEM; | |
1181 | else { | |
1182 | rc = 0; | |
1183 | skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; | |
1184 | skp->smk_mask.s_addr = mask.s_addr; | |
6d3dc07c | 1185 | skp->smk_label = sp; |
113a0e45 | 1186 | smk_netlbladdr_insert(skp); |
6d3dc07c CS |
1187 | } |
1188 | } else { | |
4303154e | 1189 | /* we delete the unlabeled entry, only if the previous label |
25985edc | 1190 | * wasn't the special CIPSO option */ |
4303154e EB |
1191 | if (skp->smk_label != smack_cipso_option) |
1192 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, | |
1193 | &skp->smk_host.sin_addr, &skp->smk_mask, | |
1194 | PF_INET, &audit_info); | |
1195 | else | |
1196 | rc = 0; | |
6d3dc07c CS |
1197 | skp->smk_label = sp; |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * Now tell netlabel about the single label nature of | |
1202 | * this host so that incoming packets get labeled. | |
4303154e | 1203 | * but only if we didn't get the special CIPSO option |
6d3dc07c | 1204 | */ |
4303154e | 1205 | if (rc == 0 && sp != smack_cipso_option) |
6d3dc07c CS |
1206 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
1207 | &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, | |
1208 | smack_to_secid(skp->smk_label), &audit_info); | |
1209 | ||
1210 | if (rc == 0) | |
1211 | rc = count; | |
1212 | ||
1213 | mutex_unlock(&smk_netlbladdr_lock); | |
1214 | ||
f7112e6c CS |
1215 | free_out: |
1216 | kfree(smack); | |
1217 | free_data_out: | |
1218 | kfree(data); | |
1219 | ||
6d3dc07c CS |
1220 | return rc; |
1221 | } | |
1222 | ||
1223 | static const struct file_operations smk_netlbladdr_ops = { | |
1224 | .open = smk_open_netlbladdr, | |
1225 | .read = seq_read, | |
1226 | .llseek = seq_lseek, | |
1227 | .write = smk_write_netlbladdr, | |
1228 | .release = seq_release, | |
1229 | }; | |
1230 | ||
e114e473 CS |
1231 | /** |
1232 | * smk_read_doi - read() for /smack/doi | |
1233 | * @filp: file pointer, not actually used | |
1234 | * @buf: where to put the result | |
1235 | * @count: maximum to send along | |
1236 | * @ppos: where to start | |
1237 | * | |
1238 | * Returns number of bytes read or error code, as appropriate | |
1239 | */ | |
1240 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, | |
1241 | size_t count, loff_t *ppos) | |
1242 | { | |
1243 | char temp[80]; | |
1244 | ssize_t rc; | |
1245 | ||
1246 | if (*ppos != 0) | |
1247 | return 0; | |
1248 | ||
1249 | sprintf(temp, "%d", smk_cipso_doi_value); | |
1250 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1251 | ||
1252 | return rc; | |
1253 | } | |
1254 | ||
1255 | /** | |
1256 | * smk_write_doi - write() for /smack/doi | |
251a2a95 | 1257 | * @file: file pointer, not actually used |
e114e473 CS |
1258 | * @buf: where to get the data from |
1259 | * @count: bytes sent | |
1260 | * @ppos: where to start | |
1261 | * | |
1262 | * Returns number of bytes written or error code, as appropriate | |
1263 | */ | |
1264 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, | |
1265 | size_t count, loff_t *ppos) | |
1266 | { | |
1267 | char temp[80]; | |
1268 | int i; | |
1269 | ||
1270 | if (!capable(CAP_MAC_ADMIN)) | |
1271 | return -EPERM; | |
1272 | ||
1273 | if (count >= sizeof(temp) || count == 0) | |
1274 | return -EINVAL; | |
1275 | ||
1276 | if (copy_from_user(temp, buf, count) != 0) | |
1277 | return -EFAULT; | |
1278 | ||
1279 | temp[count] = '\0'; | |
1280 | ||
1281 | if (sscanf(temp, "%d", &i) != 1) | |
1282 | return -EINVAL; | |
1283 | ||
1284 | smk_cipso_doi_value = i; | |
1285 | ||
1286 | smk_cipso_doi(); | |
1287 | ||
1288 | return count; | |
1289 | } | |
1290 | ||
1291 | static const struct file_operations smk_doi_ops = { | |
1292 | .read = smk_read_doi, | |
1293 | .write = smk_write_doi, | |
6038f373 | 1294 | .llseek = default_llseek, |
e114e473 CS |
1295 | }; |
1296 | ||
1297 | /** | |
1298 | * smk_read_direct - read() for /smack/direct | |
1299 | * @filp: file pointer, not actually used | |
1300 | * @buf: where to put the result | |
1301 | * @count: maximum to send along | |
1302 | * @ppos: where to start | |
1303 | * | |
1304 | * Returns number of bytes read or error code, as appropriate | |
1305 | */ | |
1306 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, | |
1307 | size_t count, loff_t *ppos) | |
1308 | { | |
1309 | char temp[80]; | |
1310 | ssize_t rc; | |
1311 | ||
1312 | if (*ppos != 0) | |
1313 | return 0; | |
1314 | ||
1315 | sprintf(temp, "%d", smack_cipso_direct); | |
1316 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1317 | ||
1318 | return rc; | |
1319 | } | |
1320 | ||
1321 | /** | |
1322 | * smk_write_direct - write() for /smack/direct | |
251a2a95 | 1323 | * @file: file pointer, not actually used |
e114e473 CS |
1324 | * @buf: where to get the data from |
1325 | * @count: bytes sent | |
1326 | * @ppos: where to start | |
1327 | * | |
1328 | * Returns number of bytes written or error code, as appropriate | |
1329 | */ | |
1330 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, | |
1331 | size_t count, loff_t *ppos) | |
1332 | { | |
f7112e6c | 1333 | struct smack_known *skp; |
e114e473 CS |
1334 | char temp[80]; |
1335 | int i; | |
1336 | ||
1337 | if (!capable(CAP_MAC_ADMIN)) | |
1338 | return -EPERM; | |
1339 | ||
1340 | if (count >= sizeof(temp) || count == 0) | |
1341 | return -EINVAL; | |
1342 | ||
1343 | if (copy_from_user(temp, buf, count) != 0) | |
1344 | return -EFAULT; | |
1345 | ||
1346 | temp[count] = '\0'; | |
1347 | ||
1348 | if (sscanf(temp, "%d", &i) != 1) | |
1349 | return -EINVAL; | |
1350 | ||
f7112e6c CS |
1351 | /* |
1352 | * Don't do anything if the value hasn't actually changed. | |
1353 | * If it is changing reset the level on entries that were | |
1354 | * set up to be direct when they were created. | |
1355 | */ | |
1356 | if (smack_cipso_direct != i) { | |
1357 | mutex_lock(&smack_known_lock); | |
1358 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1359 | if (skp->smk_netlabel.attr.mls.lvl == | |
1360 | smack_cipso_direct) | |
1361 | skp->smk_netlabel.attr.mls.lvl = i; | |
1362 | smack_cipso_direct = i; | |
1363 | mutex_unlock(&smack_known_lock); | |
1364 | } | |
e114e473 CS |
1365 | |
1366 | return count; | |
1367 | } | |
1368 | ||
1369 | static const struct file_operations smk_direct_ops = { | |
1370 | .read = smk_read_direct, | |
1371 | .write = smk_write_direct, | |
6038f373 | 1372 | .llseek = default_llseek, |
e114e473 CS |
1373 | }; |
1374 | ||
f7112e6c CS |
1375 | /** |
1376 | * smk_read_mapped - read() for /smack/mapped | |
1377 | * @filp: file pointer, not actually used | |
1378 | * @buf: where to put the result | |
1379 | * @count: maximum to send along | |
1380 | * @ppos: where to start | |
1381 | * | |
1382 | * Returns number of bytes read or error code, as appropriate | |
1383 | */ | |
1384 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, | |
1385 | size_t count, loff_t *ppos) | |
1386 | { | |
1387 | char temp[80]; | |
1388 | ssize_t rc; | |
1389 | ||
1390 | if (*ppos != 0) | |
1391 | return 0; | |
1392 | ||
1393 | sprintf(temp, "%d", smack_cipso_mapped); | |
1394 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1395 | ||
1396 | return rc; | |
1397 | } | |
1398 | ||
1399 | /** | |
1400 | * smk_write_mapped - write() for /smack/mapped | |
1401 | * @file: file pointer, not actually used | |
1402 | * @buf: where to get the data from | |
1403 | * @count: bytes sent | |
1404 | * @ppos: where to start | |
1405 | * | |
1406 | * Returns number of bytes written or error code, as appropriate | |
1407 | */ | |
1408 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, | |
1409 | size_t count, loff_t *ppos) | |
1410 | { | |
1411 | struct smack_known *skp; | |
1412 | char temp[80]; | |
1413 | int i; | |
1414 | ||
1415 | if (!capable(CAP_MAC_ADMIN)) | |
1416 | return -EPERM; | |
1417 | ||
1418 | if (count >= sizeof(temp) || count == 0) | |
1419 | return -EINVAL; | |
1420 | ||
1421 | if (copy_from_user(temp, buf, count) != 0) | |
1422 | return -EFAULT; | |
1423 | ||
1424 | temp[count] = '\0'; | |
1425 | ||
1426 | if (sscanf(temp, "%d", &i) != 1) | |
1427 | return -EINVAL; | |
1428 | ||
1429 | /* | |
1430 | * Don't do anything if the value hasn't actually changed. | |
1431 | * If it is changing reset the level on entries that were | |
1432 | * set up to be mapped when they were created. | |
1433 | */ | |
1434 | if (smack_cipso_mapped != i) { | |
1435 | mutex_lock(&smack_known_lock); | |
1436 | list_for_each_entry_rcu(skp, &smack_known_list, list) | |
1437 | if (skp->smk_netlabel.attr.mls.lvl == | |
1438 | smack_cipso_mapped) | |
1439 | skp->smk_netlabel.attr.mls.lvl = i; | |
1440 | smack_cipso_mapped = i; | |
1441 | mutex_unlock(&smack_known_lock); | |
1442 | } | |
1443 | ||
1444 | return count; | |
1445 | } | |
1446 | ||
1447 | static const struct file_operations smk_mapped_ops = { | |
1448 | .read = smk_read_mapped, | |
1449 | .write = smk_write_mapped, | |
1450 | .llseek = default_llseek, | |
1451 | }; | |
1452 | ||
e114e473 CS |
1453 | /** |
1454 | * smk_read_ambient - read() for /smack/ambient | |
1455 | * @filp: file pointer, not actually used | |
1456 | * @buf: where to put the result | |
1457 | * @cn: maximum to send along | |
1458 | * @ppos: where to start | |
1459 | * | |
1460 | * Returns number of bytes read or error code, as appropriate | |
1461 | */ | |
1462 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, | |
1463 | size_t cn, loff_t *ppos) | |
1464 | { | |
1465 | ssize_t rc; | |
e114e473 CS |
1466 | int asize; |
1467 | ||
1468 | if (*ppos != 0) | |
1469 | return 0; | |
1470 | /* | |
1471 | * Being careful to avoid a problem in the case where | |
1472 | * smack_net_ambient gets changed in midstream. | |
e114e473 | 1473 | */ |
4bc87e62 | 1474 | mutex_lock(&smack_ambient_lock); |
e114e473 | 1475 | |
4bc87e62 CS |
1476 | asize = strlen(smack_net_ambient) + 1; |
1477 | ||
1478 | if (cn >= asize) | |
1479 | rc = simple_read_from_buffer(buf, cn, ppos, | |
1480 | smack_net_ambient, asize); | |
1481 | else | |
1482 | rc = -EINVAL; | |
e114e473 | 1483 | |
4bc87e62 | 1484 | mutex_unlock(&smack_ambient_lock); |
e114e473 CS |
1485 | |
1486 | return rc; | |
1487 | } | |
1488 | ||
1489 | /** | |
1490 | * smk_write_ambient - write() for /smack/ambient | |
251a2a95 | 1491 | * @file: file pointer, not actually used |
e114e473 CS |
1492 | * @buf: where to get the data from |
1493 | * @count: bytes sent | |
1494 | * @ppos: where to start | |
1495 | * | |
1496 | * Returns number of bytes written or error code, as appropriate | |
1497 | */ | |
1498 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, | |
1499 | size_t count, loff_t *ppos) | |
1500 | { | |
4bc87e62 | 1501 | char *oldambient; |
f7112e6c CS |
1502 | char *smack = NULL; |
1503 | char *data; | |
1504 | int rc = count; | |
e114e473 CS |
1505 | |
1506 | if (!capable(CAP_MAC_ADMIN)) | |
1507 | return -EPERM; | |
1508 | ||
f7112e6c CS |
1509 | data = kzalloc(count + 1, GFP_KERNEL); |
1510 | if (data == NULL) | |
1511 | return -ENOMEM; | |
e114e473 | 1512 | |
f7112e6c CS |
1513 | if (copy_from_user(data, buf, count) != 0) { |
1514 | rc = -EFAULT; | |
1515 | goto out; | |
1516 | } | |
e114e473 | 1517 | |
f7112e6c CS |
1518 | smack = smk_import(data, count); |
1519 | if (smack == NULL) { | |
1520 | rc = -EINVAL; | |
1521 | goto out; | |
1522 | } | |
e114e473 | 1523 | |
4bc87e62 CS |
1524 | mutex_lock(&smack_ambient_lock); |
1525 | ||
1526 | oldambient = smack_net_ambient; | |
e114e473 | 1527 | smack_net_ambient = smack; |
4bc87e62 CS |
1528 | smk_unlbl_ambient(oldambient); |
1529 | ||
1530 | mutex_unlock(&smack_ambient_lock); | |
e114e473 | 1531 | |
f7112e6c CS |
1532 | out: |
1533 | kfree(data); | |
1534 | return rc; | |
e114e473 CS |
1535 | } |
1536 | ||
1537 | static const struct file_operations smk_ambient_ops = { | |
1538 | .read = smk_read_ambient, | |
1539 | .write = smk_write_ambient, | |
6038f373 | 1540 | .llseek = default_llseek, |
e114e473 CS |
1541 | }; |
1542 | ||
15446235 CS |
1543 | /** |
1544 | * smk_read_onlycap - read() for /smack/onlycap | |
1545 | * @filp: file pointer, not actually used | |
1546 | * @buf: where to put the result | |
1547 | * @cn: maximum to send along | |
1548 | * @ppos: where to start | |
1549 | * | |
1550 | * Returns number of bytes read or error code, as appropriate | |
1551 | */ | |
1552 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, | |
1553 | size_t cn, loff_t *ppos) | |
1554 | { | |
1555 | char *smack = ""; | |
1556 | ssize_t rc = -EINVAL; | |
1557 | int asize; | |
1558 | ||
1559 | if (*ppos != 0) | |
1560 | return 0; | |
1561 | ||
1562 | if (smack_onlycap != NULL) | |
1563 | smack = smack_onlycap; | |
1564 | ||
1565 | asize = strlen(smack) + 1; | |
1566 | ||
1567 | if (cn >= asize) | |
1568 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); | |
1569 | ||
1570 | return rc; | |
1571 | } | |
1572 | ||
1573 | /** | |
1574 | * smk_write_onlycap - write() for /smack/onlycap | |
251a2a95 | 1575 | * @file: file pointer, not actually used |
15446235 CS |
1576 | * @buf: where to get the data from |
1577 | * @count: bytes sent | |
1578 | * @ppos: where to start | |
1579 | * | |
1580 | * Returns number of bytes written or error code, as appropriate | |
1581 | */ | |
1582 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, | |
1583 | size_t count, loff_t *ppos) | |
1584 | { | |
f7112e6c | 1585 | char *data; |
676dac4b | 1586 | char *sp = smk_of_task(current->cred->security); |
f7112e6c | 1587 | int rc = count; |
15446235 CS |
1588 | |
1589 | if (!capable(CAP_MAC_ADMIN)) | |
1590 | return -EPERM; | |
1591 | ||
1592 | /* | |
1593 | * This can be done using smk_access() but is done | |
1594 | * explicitly for clarity. The smk_access() implementation | |
1595 | * would use smk_access(smack_onlycap, MAY_WRITE) | |
1596 | */ | |
1597 | if (smack_onlycap != NULL && smack_onlycap != sp) | |
1598 | return -EPERM; | |
1599 | ||
f7112e6c CS |
1600 | data = kzalloc(count, GFP_KERNEL); |
1601 | if (data == NULL) | |
1602 | return -ENOMEM; | |
15446235 CS |
1603 | |
1604 | /* | |
1605 | * Should the null string be passed in unset the onlycap value. | |
1606 | * This seems like something to be careful with as usually | |
1607 | * smk_import only expects to return NULL for errors. It | |
1608 | * is usually the case that a nullstring or "\n" would be | |
1609 | * bad to pass to smk_import but in fact this is useful here. | |
f7112e6c CS |
1610 | * |
1611 | * smk_import will also reject a label beginning with '-', | |
1612 | * so "-usecapabilities" will also work. | |
15446235 | 1613 | */ |
f7112e6c CS |
1614 | if (copy_from_user(data, buf, count) != 0) |
1615 | rc = -EFAULT; | |
1616 | else | |
1617 | smack_onlycap = smk_import(data, count); | |
15446235 | 1618 | |
f7112e6c CS |
1619 | kfree(data); |
1620 | return rc; | |
15446235 CS |
1621 | } |
1622 | ||
1623 | static const struct file_operations smk_onlycap_ops = { | |
1624 | .read = smk_read_onlycap, | |
1625 | .write = smk_write_onlycap, | |
6038f373 | 1626 | .llseek = default_llseek, |
15446235 CS |
1627 | }; |
1628 | ||
ecfcc53f EB |
1629 | /** |
1630 | * smk_read_logging - read() for /smack/logging | |
1631 | * @filp: file pointer, not actually used | |
1632 | * @buf: where to put the result | |
1633 | * @cn: maximum to send along | |
1634 | * @ppos: where to start | |
1635 | * | |
1636 | * Returns number of bytes read or error code, as appropriate | |
1637 | */ | |
1638 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, | |
1639 | size_t count, loff_t *ppos) | |
1640 | { | |
1641 | char temp[32]; | |
1642 | ssize_t rc; | |
1643 | ||
1644 | if (*ppos != 0) | |
1645 | return 0; | |
1646 | ||
1647 | sprintf(temp, "%d\n", log_policy); | |
1648 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); | |
1649 | return rc; | |
1650 | } | |
1651 | ||
1652 | /** | |
1653 | * smk_write_logging - write() for /smack/logging | |
1654 | * @file: file pointer, not actually used | |
1655 | * @buf: where to get the data from | |
1656 | * @count: bytes sent | |
1657 | * @ppos: where to start | |
1658 | * | |
1659 | * Returns number of bytes written or error code, as appropriate | |
1660 | */ | |
1661 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, | |
1662 | size_t count, loff_t *ppos) | |
1663 | { | |
1664 | char temp[32]; | |
1665 | int i; | |
1666 | ||
1667 | if (!capable(CAP_MAC_ADMIN)) | |
1668 | return -EPERM; | |
1669 | ||
1670 | if (count >= sizeof(temp) || count == 0) | |
1671 | return -EINVAL; | |
1672 | ||
1673 | if (copy_from_user(temp, buf, count) != 0) | |
1674 | return -EFAULT; | |
1675 | ||
1676 | temp[count] = '\0'; | |
1677 | ||
1678 | if (sscanf(temp, "%d", &i) != 1) | |
1679 | return -EINVAL; | |
1680 | if (i < 0 || i > 3) | |
1681 | return -EINVAL; | |
1682 | log_policy = i; | |
1683 | return count; | |
1684 | } | |
1685 | ||
1686 | ||
1687 | ||
1688 | static const struct file_operations smk_logging_ops = { | |
1689 | .read = smk_read_logging, | |
1690 | .write = smk_write_logging, | |
6038f373 | 1691 | .llseek = default_llseek, |
ecfcc53f | 1692 | }; |
7898e1f8 CS |
1693 | |
1694 | /* | |
1695 | * Seq_file read operations for /smack/load-self | |
1696 | */ | |
1697 | ||
1698 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) | |
1699 | { | |
1700 | struct task_smack *tsp = current_security(); | |
1701 | ||
40809565 | 1702 | return smk_seq_start(s, pos, &tsp->smk_rules); |
7898e1f8 CS |
1703 | } |
1704 | ||
1705 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1706 | { | |
1707 | struct task_smack *tsp = current_security(); | |
7898e1f8 | 1708 | |
40809565 | 1709 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
7898e1f8 CS |
1710 | } |
1711 | ||
1712 | static int load_self_seq_show(struct seq_file *s, void *v) | |
1713 | { | |
1714 | struct list_head *list = v; | |
1715 | struct smack_rule *srp = | |
1716 | list_entry(list, struct smack_rule, list); | |
1717 | ||
f7112e6c | 1718 | smk_rule_show(s, srp, SMK_LABELLEN); |
7898e1f8 CS |
1719 | |
1720 | return 0; | |
1721 | } | |
1722 | ||
7898e1f8 CS |
1723 | static const struct seq_operations load_self_seq_ops = { |
1724 | .start = load_self_seq_start, | |
1725 | .next = load_self_seq_next, | |
1726 | .show = load_self_seq_show, | |
40809565 | 1727 | .stop = smk_seq_stop, |
7898e1f8 CS |
1728 | }; |
1729 | ||
1730 | ||
1731 | /** | |
f7112e6c | 1732 | * smk_open_load_self - open() for /smack/load-self2 |
7898e1f8 CS |
1733 | * @inode: inode structure representing file |
1734 | * @file: "load" file pointer | |
1735 | * | |
1736 | * For reading, use load_seq_* seq_file reading operations. | |
1737 | */ | |
1738 | static int smk_open_load_self(struct inode *inode, struct file *file) | |
1739 | { | |
1740 | return seq_open(file, &load_self_seq_ops); | |
1741 | } | |
1742 | ||
1743 | /** | |
1744 | * smk_write_load_self - write() for /smack/load-self | |
1745 | * @file: file pointer, not actually used | |
1746 | * @buf: where to get the data from | |
1747 | * @count: bytes sent | |
1748 | * @ppos: where to start - must be 0 | |
1749 | * | |
1750 | */ | |
1751 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, | |
1752 | size_t count, loff_t *ppos) | |
1753 | { | |
1754 | struct task_smack *tsp = current_security(); | |
1755 | ||
f7112e6c CS |
1756 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
1757 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); | |
7898e1f8 CS |
1758 | } |
1759 | ||
1760 | static const struct file_operations smk_load_self_ops = { | |
1761 | .open = smk_open_load_self, | |
1762 | .read = seq_read, | |
1763 | .llseek = seq_lseek, | |
1764 | .write = smk_write_load_self, | |
1765 | .release = seq_release, | |
1766 | }; | |
828716c2 JS |
1767 | |
1768 | /** | |
f7112e6c | 1769 | * smk_user_access - handle access check transaction |
828716c2 JS |
1770 | * @file: file pointer |
1771 | * @buf: data from user space | |
1772 | * @count: bytes sent | |
1773 | * @ppos: where to start - must be 0 | |
1774 | */ | |
f7112e6c CS |
1775 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
1776 | size_t count, loff_t *ppos, int format) | |
828716c2 JS |
1777 | { |
1778 | struct smack_rule rule; | |
1779 | char *data; | |
f7112e6c | 1780 | char *cod; |
f8859d98 | 1781 | int res; |
828716c2 | 1782 | |
828716c2 JS |
1783 | data = simple_transaction_get(file, buf, count); |
1784 | if (IS_ERR(data)) | |
1785 | return PTR_ERR(data); | |
1786 | ||
f7112e6c CS |
1787 | if (format == SMK_FIXED24_FMT) { |
1788 | if (count < SMK_LOADLEN) | |
1789 | return -EINVAL; | |
1790 | res = smk_parse_rule(data, &rule, 0); | |
1791 | } else { | |
1792 | /* | |
1793 | * Copy the data to make sure the string is terminated. | |
1794 | */ | |
1795 | cod = kzalloc(count + 1, GFP_KERNEL); | |
1796 | if (cod == NULL) | |
1797 | return -ENOMEM; | |
1798 | memcpy(cod, data, count); | |
1799 | cod[count] = '\0'; | |
1800 | res = smk_parse_long_rule(cod, &rule, 0); | |
1801 | kfree(cod); | |
1802 | } | |
1803 | ||
1804 | if (res) | |
828716c2 JS |
1805 | return -EINVAL; |
1806 | ||
f8859d98 JS |
1807 | res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access, |
1808 | NULL); | |
1809 | data[0] = res == 0 ? '1' : '0'; | |
1810 | data[1] = '\0'; | |
828716c2 | 1811 | |
d86b2b61 | 1812 | simple_transaction_set(file, 2); |
f7112e6c CS |
1813 | |
1814 | if (format == SMK_FIXED24_FMT) | |
1815 | return SMK_LOADLEN; | |
1816 | return count; | |
1817 | } | |
1818 | ||
1819 | /** | |
1820 | * smk_write_access - handle access check transaction | |
1821 | * @file: file pointer | |
1822 | * @buf: data from user space | |
1823 | * @count: bytes sent | |
1824 | * @ppos: where to start - must be 0 | |
1825 | */ | |
1826 | static ssize_t smk_write_access(struct file *file, const char __user *buf, | |
1827 | size_t count, loff_t *ppos) | |
1828 | { | |
1829 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); | |
828716c2 JS |
1830 | } |
1831 | ||
1832 | static const struct file_operations smk_access_ops = { | |
1833 | .write = smk_write_access, | |
1834 | .read = simple_transaction_read, | |
1835 | .release = simple_transaction_release, | |
1836 | .llseek = generic_file_llseek, | |
1837 | }; | |
1838 | ||
f7112e6c CS |
1839 | |
1840 | /* | |
1841 | * Seq_file read operations for /smack/load2 | |
1842 | */ | |
1843 | ||
1844 | static int load2_seq_show(struct seq_file *s, void *v) | |
1845 | { | |
1846 | struct list_head *list = v; | |
1847 | struct smack_master_list *smlp = | |
1848 | list_entry(list, struct smack_master_list, list); | |
1849 | ||
1850 | smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); | |
1851 | ||
1852 | return 0; | |
1853 | } | |
1854 | ||
1855 | static const struct seq_operations load2_seq_ops = { | |
1856 | .start = load2_seq_start, | |
1857 | .next = load2_seq_next, | |
1858 | .show = load2_seq_show, | |
1859 | .stop = smk_seq_stop, | |
1860 | }; | |
1861 | ||
1862 | /** | |
1863 | * smk_open_load2 - open() for /smack/load2 | |
1864 | * @inode: inode structure representing file | |
1865 | * @file: "load2" file pointer | |
1866 | * | |
1867 | * For reading, use load2_seq_* seq_file reading operations. | |
1868 | */ | |
1869 | static int smk_open_load2(struct inode *inode, struct file *file) | |
1870 | { | |
1871 | return seq_open(file, &load2_seq_ops); | |
1872 | } | |
1873 | ||
1874 | /** | |
1875 | * smk_write_load2 - write() for /smack/load2 | |
1876 | * @file: file pointer, not actually used | |
1877 | * @buf: where to get the data from | |
1878 | * @count: bytes sent | |
1879 | * @ppos: where to start - must be 0 | |
1880 | * | |
1881 | */ | |
1882 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, | |
1883 | size_t count, loff_t *ppos) | |
1884 | { | |
1885 | /* | |
1886 | * Must have privilege. | |
1887 | */ | |
1888 | if (!capable(CAP_MAC_ADMIN)) | |
1889 | return -EPERM; | |
1890 | ||
1891 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, | |
1892 | SMK_LONG_FMT); | |
1893 | } | |
1894 | ||
1895 | static const struct file_operations smk_load2_ops = { | |
1896 | .open = smk_open_load2, | |
1897 | .read = seq_read, | |
1898 | .llseek = seq_lseek, | |
1899 | .write = smk_write_load2, | |
1900 | .release = seq_release, | |
1901 | }; | |
1902 | ||
1903 | /* | |
1904 | * Seq_file read operations for /smack/load-self2 | |
1905 | */ | |
1906 | ||
1907 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) | |
1908 | { | |
1909 | struct task_smack *tsp = current_security(); | |
1910 | ||
1911 | return smk_seq_start(s, pos, &tsp->smk_rules); | |
1912 | } | |
1913 | ||
1914 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
1915 | { | |
1916 | struct task_smack *tsp = current_security(); | |
1917 | ||
1918 | return smk_seq_next(s, v, pos, &tsp->smk_rules); | |
1919 | } | |
1920 | ||
1921 | static int load_self2_seq_show(struct seq_file *s, void *v) | |
1922 | { | |
1923 | struct list_head *list = v; | |
1924 | struct smack_rule *srp = | |
1925 | list_entry(list, struct smack_rule, list); | |
1926 | ||
1927 | smk_rule_show(s, srp, SMK_LONGLABEL); | |
1928 | ||
1929 | return 0; | |
1930 | } | |
1931 | ||
1932 | static const struct seq_operations load_self2_seq_ops = { | |
1933 | .start = load_self2_seq_start, | |
1934 | .next = load_self2_seq_next, | |
1935 | .show = load_self2_seq_show, | |
1936 | .stop = smk_seq_stop, | |
1937 | }; | |
1938 | ||
1939 | /** | |
1940 | * smk_open_load_self2 - open() for /smack/load-self2 | |
1941 | * @inode: inode structure representing file | |
1942 | * @file: "load" file pointer | |
1943 | * | |
1944 | * For reading, use load_seq_* seq_file reading operations. | |
1945 | */ | |
1946 | static int smk_open_load_self2(struct inode *inode, struct file *file) | |
1947 | { | |
1948 | return seq_open(file, &load_self2_seq_ops); | |
1949 | } | |
1950 | ||
1951 | /** | |
1952 | * smk_write_load_self2 - write() for /smack/load-self2 | |
1953 | * @file: file pointer, not actually used | |
1954 | * @buf: where to get the data from | |
1955 | * @count: bytes sent | |
1956 | * @ppos: where to start - must be 0 | |
1957 | * | |
1958 | */ | |
1959 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, | |
1960 | size_t count, loff_t *ppos) | |
1961 | { | |
1962 | struct task_smack *tsp = current_security(); | |
1963 | ||
1964 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, | |
1965 | &tsp->smk_rules_lock, SMK_LONG_FMT); | |
1966 | } | |
1967 | ||
1968 | static const struct file_operations smk_load_self2_ops = { | |
1969 | .open = smk_open_load_self2, | |
1970 | .read = seq_read, | |
1971 | .llseek = seq_lseek, | |
1972 | .write = smk_write_load_self2, | |
1973 | .release = seq_release, | |
1974 | }; | |
1975 | ||
1976 | /** | |
1977 | * smk_write_access2 - handle access check transaction | |
1978 | * @file: file pointer | |
1979 | * @buf: data from user space | |
1980 | * @count: bytes sent | |
1981 | * @ppos: where to start - must be 0 | |
1982 | */ | |
1983 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, | |
1984 | size_t count, loff_t *ppos) | |
1985 | { | |
1986 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); | |
1987 | } | |
1988 | ||
1989 | static const struct file_operations smk_access2_ops = { | |
1990 | .write = smk_write_access2, | |
1991 | .read = simple_transaction_read, | |
1992 | .release = simple_transaction_release, | |
1993 | .llseek = generic_file_llseek, | |
1994 | }; | |
1995 | ||
e114e473 CS |
1996 | /** |
1997 | * smk_fill_super - fill the /smackfs superblock | |
1998 | * @sb: the empty superblock | |
1999 | * @data: unused | |
2000 | * @silent: unused | |
2001 | * | |
2002 | * Fill in the well known entries for /smack | |
2003 | * | |
2004 | * Returns 0 on success, an error code on failure | |
2005 | */ | |
2006 | static int smk_fill_super(struct super_block *sb, void *data, int silent) | |
2007 | { | |
2008 | int rc; | |
2009 | struct inode *root_inode; | |
2010 | ||
2011 | static struct tree_descr smack_files[] = { | |
7898e1f8 CS |
2012 | [SMK_LOAD] = { |
2013 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, | |
2014 | [SMK_CIPSO] = { | |
2015 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, | |
2016 | [SMK_DOI] = { | |
2017 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, | |
2018 | [SMK_DIRECT] = { | |
2019 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, | |
2020 | [SMK_AMBIENT] = { | |
2021 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, | |
2022 | [SMK_NETLBLADDR] = { | |
2023 | "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, | |
2024 | [SMK_ONLYCAP] = { | |
2025 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, | |
2026 | [SMK_LOGGING] = { | |
2027 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, | |
2028 | [SMK_LOAD_SELF] = { | |
2029 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, | |
828716c2 | 2030 | [SMK_ACCESSES] = { |
0e94ae17 | 2031 | "access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
f7112e6c CS |
2032 | [SMK_MAPPED] = { |
2033 | "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, | |
2034 | [SMK_LOAD2] = { | |
2035 | "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, | |
2036 | [SMK_LOAD_SELF2] = { | |
2037 | "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, | |
2038 | [SMK_ACCESS2] = { | |
2039 | "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, | |
2040 | [SMK_CIPSO2] = { | |
2041 | "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, | |
7898e1f8 CS |
2042 | /* last one */ |
2043 | {""} | |
e114e473 CS |
2044 | }; |
2045 | ||
2046 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); | |
2047 | if (rc != 0) { | |
2048 | printk(KERN_ERR "%s failed %d while creating inodes\n", | |
2049 | __func__, rc); | |
2050 | return rc; | |
2051 | } | |
2052 | ||
2053 | root_inode = sb->s_root->d_inode; | |
2054 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); | |
2055 | ||
2056 | return 0; | |
2057 | } | |
2058 | ||
2059 | /** | |
fc14f2fe | 2060 | * smk_mount - get the smackfs superblock |
e114e473 CS |
2061 | * @fs_type: passed along without comment |
2062 | * @flags: passed along without comment | |
2063 | * @dev_name: passed along without comment | |
2064 | * @data: passed along without comment | |
e114e473 CS |
2065 | * |
2066 | * Just passes everything along. | |
2067 | * | |
2068 | * Returns what the lower level code does. | |
2069 | */ | |
fc14f2fe AV |
2070 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
2071 | int flags, const char *dev_name, void *data) | |
e114e473 | 2072 | { |
fc14f2fe | 2073 | return mount_single(fs_type, flags, data, smk_fill_super); |
e114e473 CS |
2074 | } |
2075 | ||
2076 | static struct file_system_type smk_fs_type = { | |
2077 | .name = "smackfs", | |
fc14f2fe | 2078 | .mount = smk_mount, |
e114e473 CS |
2079 | .kill_sb = kill_litter_super, |
2080 | }; | |
2081 | ||
2082 | static struct vfsmount *smackfs_mount; | |
2083 | ||
f7112e6c CS |
2084 | static int __init smk_preset_netlabel(struct smack_known *skp) |
2085 | { | |
2086 | skp->smk_netlabel.domain = skp->smk_known; | |
2087 | skp->smk_netlabel.flags = | |
2088 | NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
2089 | return smk_netlbl_mls(smack_cipso_direct, skp->smk_known, | |
2090 | &skp->smk_netlabel, strlen(skp->smk_known)); | |
2091 | } | |
2092 | ||
e114e473 CS |
2093 | /** |
2094 | * init_smk_fs - get the smackfs superblock | |
2095 | * | |
2096 | * register the smackfs | |
2097 | * | |
076c54c5 AD |
2098 | * Do not register smackfs if Smack wasn't enabled |
2099 | * on boot. We can not put this method normally under the | |
2100 | * smack_init() code path since the security subsystem get | |
2101 | * initialized before the vfs caches. | |
2102 | * | |
2103 | * Returns true if we were not chosen on boot or if | |
2104 | * we were chosen and filesystem registration succeeded. | |
e114e473 CS |
2105 | */ |
2106 | static int __init init_smk_fs(void) | |
2107 | { | |
2108 | int err; | |
f7112e6c | 2109 | int rc; |
e114e473 | 2110 | |
076c54c5 AD |
2111 | if (!security_module_enable(&smack_ops)) |
2112 | return 0; | |
2113 | ||
e114e473 CS |
2114 | err = register_filesystem(&smk_fs_type); |
2115 | if (!err) { | |
2116 | smackfs_mount = kern_mount(&smk_fs_type); | |
2117 | if (IS_ERR(smackfs_mount)) { | |
2118 | printk(KERN_ERR "smackfs: could not mount!\n"); | |
2119 | err = PTR_ERR(smackfs_mount); | |
2120 | smackfs_mount = NULL; | |
2121 | } | |
2122 | } | |
2123 | ||
e114e473 | 2124 | smk_cipso_doi(); |
4bc87e62 | 2125 | smk_unlbl_ambient(NULL); |
e114e473 | 2126 | |
f7112e6c CS |
2127 | rc = smk_preset_netlabel(&smack_known_floor); |
2128 | if (err == 0 && rc < 0) | |
2129 | err = rc; | |
2130 | rc = smk_preset_netlabel(&smack_known_hat); | |
2131 | if (err == 0 && rc < 0) | |
2132 | err = rc; | |
2133 | rc = smk_preset_netlabel(&smack_known_huh); | |
2134 | if (err == 0 && rc < 0) | |
2135 | err = rc; | |
2136 | rc = smk_preset_netlabel(&smack_known_invalid); | |
2137 | if (err == 0 && rc < 0) | |
2138 | err = rc; | |
2139 | rc = smk_preset_netlabel(&smack_known_star); | |
2140 | if (err == 0 && rc < 0) | |
2141 | err = rc; | |
2142 | rc = smk_preset_netlabel(&smack_known_web); | |
2143 | if (err == 0 && rc < 0) | |
2144 | err = rc; | |
2145 | ||
e114e473 CS |
2146 | return err; |
2147 | } | |
2148 | ||
2149 | __initcall(init_smk_fs); |