1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> |
4 | * |
5 | * Authors: |
6 | * Casey Schaufler <casey@schaufler-ca.com> |
7 | * Ahmed S. Darwish <darwish.07@gmail.com> |
8 | * |
9 | * Special thanks to the authors of selinuxfs. |
10 | * |
11 | * Karl MacMillan <kmacmillan@tresys.com> |
12 | * James Morris <jmorris@redhat.com> |
13 | */ |
14 | |
15 | #include <linux/kernel.h> |
16 | #include <linux/vmalloc.h> |
17 | #include <linux/security.h> |
18 | #include <linux/mutex.h> |
19 | #include <linux/slab.h> |
20 | #include <net/net_namespace.h> |
21 | #include <net/cipso_ipv4.h> |
22 | #include <linux/seq_file.h> |
23 | #include <linux/ctype.h> |
24 | #include <linux/audit.h> |
25 | #include <linux/magic.h> |
26 | #include <linux/mount.h> |
27 | #include <linux/fs_context.h> |
28 | #include "smack.h" |
29 | |
30 | #define BEBITS (sizeof(__be32) * 8) |
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 */ |
42 | SMK_NET4ADDR = 8, /* single label hosts */ |
43 | SMK_ONLYCAP = 9, /* the only "capable" label */ |
44 | SMK_LOGGING = 10, /* logging */ |
45 | SMK_LOAD_SELF = 11, /* task specific rules */ |
46 | SMK_ACCESSES = 12, /* access policy */ |
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 */ |
52 | SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */ |
53 | SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */ |
54 | SMK_SYSLOG = 20, /* change syslog label) */ |
55 | SMK_PTRACE = 21, /* set ptrace rule */ |
56 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
57 | SMK_UNCONFINED = 22, /* define an unconfined label */ |
58 | #endif |
59 | #if IS_ENABLED(CONFIG_IPV6) |
60 | SMK_NET6ADDR = 23, /* single label IPv6 hosts */ |
61 | #endif /* CONFIG_IPV6 */ |
62 | SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */ |
63 | }; |
64 | |
65 | /* |
66 | * List locks |
67 | */ |
68 | static DEFINE_MUTEX(smack_cipso_lock); |
69 | static DEFINE_MUTEX(smack_ambient_lock); |
70 | static DEFINE_MUTEX(smk_net4addr_lock); |
71 | #if IS_ENABLED(CONFIG_IPV6) |
72 | static DEFINE_MUTEX(smk_net6addr_lock); |
73 | #endif /* CONFIG_IPV6 */ |
74 | |
75 | /* |
76 | * This is the "ambient" label for network traffic. |
77 | * If it isn't somehow marked, use this. |
78 | * It can be reset via smackfs/ambient |
79 | */ |
80 | struct smack_known *smack_net_ambient; |
81 | |
82 | /* |
83 | * This is the level in a CIPSO header that indicates a |
84 | * smack label is contained directly in the category set. |
85 | * It can be reset via smackfs/direct |
86 | */ |
87 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; |
88 | |
89 | /* |
90 | * This is the level in a CIPSO header that indicates a |
91 | * secid is contained directly in the category set. |
92 | * It can be reset via smackfs/mapped |
93 | */ |
94 | int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; |
95 | |
96 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
97 | /* |
98 | * Allow one label to be unconfined. This is for |
99 | * debugging and application bring-up purposes only. |
100 | * It is bad and wrong, but everyone seems to expect |
101 | * to have it. |
102 | */ |
103 | struct smack_known *smack_unconfined; |
104 | #endif |
105 | |
106 | /* |
107 | * If this value is set restrict syslog use to the label specified. |
108 | * It can be reset via smackfs/syslog |
109 | */ |
110 | struct smack_known *smack_syslog_label; |
111 | |
112 | /* |
113 | * Ptrace current rule |
114 | * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based) |
115 | * SMACK_PTRACE_EXACT labels must match, but can be overriden with |
116 | * CAP_SYS_PTRACE |
117 | * SMACK_PTRACE_DRACONIAN labels must match, CAP_SYS_PTRACE has no effect |
118 | */ |
119 | int smack_ptrace_rule = SMACK_PTRACE_DEFAULT; |
120 | |
121 | /* |
122 | * Certain IP addresses may be designated as single label hosts. |
123 | * Packets are sent there unlabeled, but only from tasks that |
124 | * can write to the specified label. |
125 | */ |
126 | |
127 | LIST_HEAD(smk_net4addr_list); |
128 | #if IS_ENABLED(CONFIG_IPV6) |
129 | LIST_HEAD(smk_net6addr_list); |
130 | #endif /* CONFIG_IPV6 */ |
131 | |
132 | /* |
133 | * Rule lists are maintained for each label. |
134 | */ |
135 | struct smack_parsed_rule { |
136 | struct smack_known *smk_subject; |
137 | struct smack_known *smk_object; |
138 | int smk_access1; |
139 | int smk_access2; |
140 | }; |
141 | |
142 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
143 | |
144 | /* |
145 | * Values for parsing cipso rules |
146 | * SMK_DIGITLEN: Length of a digit field in a rule. |
147 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
148 | * SMK_CIPSOMAX: Maximum possible cipso rule length. |
149 | */ |
150 | #define SMK_DIGITLEN 4 |
151 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
152 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) |
153 | |
154 | /* |
155 | * Values for parsing MAC rules |
156 | * SMK_ACCESS: Maximum possible combination of access permissions |
157 | * SMK_ACCESSLEN: Maximum length for a rule access field |
158 | * SMK_LOADLEN: Smack rule length |
159 | */ |
160 | #define SMK_OACCESS "rwxa" |
161 | #define SMK_ACCESS "rwxatl" |
162 | #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) |
163 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) |
164 | #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) |
165 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) |
166 | |
167 | /* |
168 | * Stricly for CIPSO level manipulation. |
169 | * Set the category bit number in a smack label sized buffer. |
170 | */ |
171 | static inline void smack_catset_bit(unsigned int cat, char *catsetp) |
172 | { |
173 | if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) |
174 | return; |
175 | |
176 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); |
177 | } |
178 | |
179 | /** |
180 | * smk_netlabel_audit_set - fill a netlbl_audit struct |
181 | * @nap: structure to fill |
182 | */ |
183 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) |
184 | { |
185 | struct smack_known *skp = smk_of_current(); |
186 | |
187 | nap->loginuid = audit_get_loginuid(current); |
188 | nap->sessionid = audit_get_sessionid(current); |
189 | nap->secid = skp->smk_secid; |
190 | } |
191 | |
192 | /* |
193 | * Value for parsing single label host rules |
194 | * "1.2.3.4 X" |
195 | */ |
196 | #define SMK_NETLBLADDRMIN 9 |
197 | |
198 | /** |
199 | * smk_set_access - add a rule to the rule list or replace an old rule |
200 | * @srp: the rule to add or replace |
201 | * @rule_list: the list of rules |
202 | * @rule_lock: the rule list lock |
203 | * |
204 | * Looks through the current subject/object/access list for |
205 | * the subject/object pair and replaces the access that was |
206 | * there. If the pair isn't found add it with the specified |
207 | * access. |
208 | * |
209 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails |
210 | * during the allocation of the new pair to add. |
211 | */ |
212 | static int smk_set_access(struct smack_parsed_rule *srp, |
213 | struct list_head *rule_list, |
214 | struct mutex *rule_lock) |
215 | { |
216 | struct smack_rule *sp; |
217 | int found = 0; |
218 | int rc = 0; |
219 | |
220 | mutex_lock(rule_lock); |
221 | |
222 | /* |
223 | * Because the object label is less likely to match |
224 | * than the subject label check it first |
225 | */ |
226 | list_for_each_entry_rcu(sp, rule_list, list) { |
227 | if (sp->smk_object == srp->smk_object && |
228 | sp->smk_subject == srp->smk_subject) { |
229 | found = 1; |
230 | sp->smk_access |= srp->smk_access1; |
231 | sp->smk_access &= ~srp->smk_access2; |
232 | break; |
233 | } |
234 | } |
235 | |
236 | if (found == 0) { |
237 | sp = kmem_cache_zalloc(k: smack_rule_cache, GFP_KERNEL); |
238 | if (sp == NULL) { |
239 | rc = -ENOMEM; |
240 | goto out; |
241 | } |
242 | |
243 | sp->smk_subject = srp->smk_subject; |
244 | sp->smk_object = srp->smk_object; |
245 | sp->smk_access = srp->smk_access1 & ~srp->smk_access2; |
246 | |
247 | list_add_rcu(new: &sp->list, head: rule_list); |
248 | } |
249 | |
250 | out: |
251 | mutex_unlock(lock: rule_lock); |
252 | return rc; |
253 | } |
254 | |
255 | /** |
256 | * smk_perm_from_str - parse smack accesses from a text string |
257 | * @string: a text string that contains a Smack accesses code |
258 | * |
259 | * Returns an integer with respective bits set for specified accesses. |
260 | */ |
261 | static int smk_perm_from_str(const char *string) |
262 | { |
263 | int perm = 0; |
264 | const char *cp; |
265 | |
266 | for (cp = string; ; cp++) |
267 | switch (*cp) { |
268 | case '-': |
269 | break; |
270 | case 'r': |
271 | case 'R': |
272 | perm |= MAY_READ; |
273 | break; |
274 | case 'w': |
275 | case 'W': |
276 | perm |= MAY_WRITE; |
277 | break; |
278 | case 'x': |
279 | case 'X': |
280 | perm |= MAY_EXEC; |
281 | break; |
282 | case 'a': |
283 | case 'A': |
284 | perm |= MAY_APPEND; |
285 | break; |
286 | case 't': |
287 | case 'T': |
288 | perm |= MAY_TRANSMUTE; |
289 | break; |
290 | case 'l': |
291 | case 'L': |
292 | perm |= MAY_LOCK; |
293 | break; |
294 | case 'b': |
295 | case 'B': |
296 | perm |= MAY_BRINGUP; |
297 | break; |
298 | default: |
299 | return perm; |
300 | } |
301 | } |
302 | |
303 | /** |
304 | * smk_fill_rule - Fill Smack rule from strings |
305 | * @subject: subject label string |
306 | * @object: object label string |
307 | * @access1: access string |
308 | * @access2: string with permissions to be removed |
309 | * @rule: Smack rule |
310 | * @import: if non-zero, import labels |
311 | * @len: label length limit |
312 | * |
313 | * Returns 0 on success, appropriate error code on failure. |
314 | */ |
315 | static int smk_fill_rule(const char *subject, const char *object, |
316 | const char *access1, const char *access2, |
317 | struct smack_parsed_rule *rule, int import, |
318 | int len) |
319 | { |
320 | const char *cp; |
321 | struct smack_known *skp; |
322 | |
323 | if (import) { |
324 | rule->smk_subject = smk_import_entry(subject, len); |
325 | if (IS_ERR(ptr: rule->smk_subject)) |
326 | return PTR_ERR(ptr: rule->smk_subject); |
327 | |
328 | rule->smk_object = smk_import_entry(object, len); |
329 | if (IS_ERR(ptr: rule->smk_object)) |
330 | return PTR_ERR(ptr: rule->smk_object); |
331 | } else { |
332 | cp = smk_parse_smack(string: subject, len); |
333 | if (IS_ERR(ptr: cp)) |
334 | return PTR_ERR(ptr: cp); |
335 | skp = smk_find_entry(cp); |
336 | kfree(objp: cp); |
337 | if (skp == NULL) |
338 | return -ENOENT; |
339 | rule->smk_subject = skp; |
340 | |
341 | cp = smk_parse_smack(string: object, len); |
342 | if (IS_ERR(ptr: cp)) |
343 | return PTR_ERR(ptr: cp); |
344 | skp = smk_find_entry(cp); |
345 | kfree(objp: cp); |
346 | if (skp == NULL) |
347 | return -ENOENT; |
348 | rule->smk_object = skp; |
349 | } |
350 | |
351 | rule->smk_access1 = smk_perm_from_str(string: access1); |
352 | if (access2) |
353 | rule->smk_access2 = smk_perm_from_str(string: access2); |
354 | else |
355 | rule->smk_access2 = ~rule->smk_access1; |
356 | |
357 | return 0; |
358 | } |
359 | |
360 | /** |
361 | * smk_parse_rule - parse Smack rule from load string |
362 | * @data: string to be parsed whose size is SMK_LOADLEN |
363 | * @rule: Smack rule |
364 | * @import: if non-zero, import labels |
365 | * |
366 | * Returns 0 on success, -1 on errors. |
367 | */ |
368 | static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule, |
369 | int import) |
370 | { |
371 | int rc; |
372 | |
373 | rc = smk_fill_rule(subject: data, object: data + SMK_LABELLEN, |
374 | access1: data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, |
375 | import, SMK_LABELLEN); |
376 | return rc; |
377 | } |
378 | |
379 | /** |
380 | * smk_parse_long_rule - parse Smack rule from rule string |
381 | * @data: string to be parsed, null terminated |
382 | * @rule: Will be filled with Smack parsed rule |
383 | * @import: if non-zero, import labels |
384 | * @tokens: number of substrings expected in data |
385 | * |
386 | * Returns number of processed bytes on success, -ERRNO on failure. |
387 | */ |
388 | static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule, |
389 | int import, int tokens) |
390 | { |
391 | ssize_t cnt = 0; |
392 | char *tok[4]; |
393 | int rc; |
394 | int i; |
395 | |
396 | /* |
397 | * Parsing the rule in-place, filling all white-spaces with '\0' |
398 | */ |
399 | for (i = 0; i < tokens; ++i) { |
400 | while (isspace(data[cnt])) |
401 | data[cnt++] = '\0'; |
402 | |
403 | if (data[cnt] == '\0') |
404 | /* Unexpected end of data */ |
405 | return -EINVAL; |
406 | |
407 | tok[i] = data + cnt; |
408 | |
409 | while (data[cnt] && !isspace(data[cnt])) |
410 | ++cnt; |
411 | } |
412 | while (isspace(data[cnt])) |
413 | data[cnt++] = '\0'; |
414 | |
415 | while (i < 4) |
416 | tok[i++] = NULL; |
417 | |
418 | rc = smk_fill_rule(subject: tok[0], object: tok[1], access1: tok[2], access2: tok[3], rule, import, len: 0); |
419 | return rc == 0 ? cnt : rc; |
420 | } |
421 | |
422 | #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
423 | #define SMK_LONG_FMT 1 /* Variable long label format */ |
424 | #define SMK_CHANGE_FMT 2 /* Rule modification format */ |
425 | /** |
426 | * smk_write_rules_list - write() for any /smack rule file |
427 | * @file: file pointer, not actually used |
428 | * @buf: where to get the data from |
429 | * @count: bytes sent |
430 | * @ppos: where to start - must be 0 |
431 | * @rule_list: the list of rules to write to |
432 | * @rule_lock: lock for the rule list |
433 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
434 | * |
435 | * Get one smack access rule from above. |
436 | * The format for SMK_LONG_FMT is: |
437 | * "subject<whitespace>object<whitespace>access[<whitespace>...]" |
438 | * The format for SMK_FIXED24_FMT is exactly: |
439 | * "subject object rwxat" |
440 | * The format for SMK_CHANGE_FMT is: |
441 | * "subject<whitespace>object<whitespace> |
442 | * acc_enable<whitespace>acc_disable[<whitespace>...]" |
443 | */ |
444 | static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
445 | size_t count, loff_t *ppos, |
446 | struct list_head *rule_list, |
447 | struct mutex *rule_lock, int format) |
448 | { |
449 | struct smack_parsed_rule rule; |
450 | char *data; |
451 | int rc; |
452 | int trunc = 0; |
453 | int tokens; |
454 | ssize_t cnt = 0; |
455 | |
456 | /* |
457 | * No partial writes. |
458 | * Enough data must be present. |
459 | */ |
460 | if (*ppos != 0) |
461 | return -EINVAL; |
462 | |
463 | if (format == SMK_FIXED24_FMT) { |
464 | /* |
465 | * Minor hack for backward compatibility |
466 | */ |
467 | if (count < SMK_OLOADLEN || count > SMK_LOADLEN) |
468 | return -EINVAL; |
469 | } else { |
470 | if (count >= PAGE_SIZE) { |
471 | count = PAGE_SIZE - 1; |
472 | trunc = 1; |
473 | } |
474 | } |
475 | |
476 | data = memdup_user_nul(buf, count); |
477 | if (IS_ERR(ptr: data)) |
478 | return PTR_ERR(ptr: data); |
479 | |
480 | /* |
481 | * In case of parsing only part of user buf, |
482 | * avoid having partial rule at the data buffer |
483 | */ |
484 | if (trunc) { |
485 | while (count > 0 && (data[count - 1] != '\n')) |
486 | --count; |
487 | if (count == 0) { |
488 | rc = -EINVAL; |
489 | goto out; |
490 | } |
491 | } |
492 | |
493 | data[count] = '\0'; |
494 | tokens = (format == SMK_CHANGE_FMT ? 4 : 3); |
495 | while (cnt < count) { |
496 | if (format == SMK_FIXED24_FMT) { |
497 | rc = smk_parse_rule(data, rule: &rule, import: 1); |
498 | if (rc < 0) |
499 | goto out; |
500 | cnt = count; |
501 | } else { |
502 | rc = smk_parse_long_rule(data: data + cnt, rule: &rule, import: 1, tokens); |
503 | if (rc < 0) |
504 | goto out; |
505 | if (rc == 0) { |
506 | rc = -EINVAL; |
507 | goto out; |
508 | } |
509 | cnt += rc; |
510 | } |
511 | |
512 | if (rule_list == NULL) |
513 | rc = smk_set_access(srp: &rule, rule_list: &rule.smk_subject->smk_rules, |
514 | rule_lock: &rule.smk_subject->smk_rules_lock); |
515 | else |
516 | rc = smk_set_access(srp: &rule, rule_list, rule_lock); |
517 | |
518 | if (rc) |
519 | goto out; |
520 | } |
521 | |
522 | rc = cnt; |
523 | out: |
524 | kfree(objp: data); |
525 | return rc; |
526 | } |
527 | |
528 | /* |
529 | * Core logic for smackfs seq list operations. |
530 | */ |
531 | |
532 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
533 | struct list_head *head) |
534 | { |
535 | struct list_head *list; |
536 | int i = *pos; |
537 | |
538 | rcu_read_lock(); |
539 | for (list = rcu_dereference(list_next_rcu(head)); |
540 | list != head; |
541 | list = rcu_dereference(list_next_rcu(list))) { |
542 | if (i-- == 0) |
543 | return list; |
544 | } |
545 | |
546 | return NULL; |
547 | } |
548 | |
549 | static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
550 | struct list_head *head) |
551 | { |
552 | struct list_head *list = v; |
553 | |
554 | ++*pos; |
555 | list = rcu_dereference(list_next_rcu(list)); |
556 | |
557 | return (list == head) ? NULL : list; |
558 | } |
559 | |
560 | static void smk_seq_stop(struct seq_file *s, void *v) |
561 | { |
562 | rcu_read_unlock(); |
563 | } |
564 | |
565 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
566 | { |
567 | /* |
568 | * Don't show any rules with label names too long for |
569 | * interface file (/smack/load or /smack/load2) |
570 | * because you should expect to be able to write |
571 | * anything you read back. |
572 | */ |
573 | if (strlen(srp->smk_subject->smk_known) >= max || |
574 | strlen(srp->smk_object->smk_known) >= max) |
575 | return; |
576 | |
577 | if (srp->smk_access == 0) |
578 | return; |
579 | |
580 | seq_printf(m: s, fmt: "%s %s" , |
581 | srp->smk_subject->smk_known, |
582 | srp->smk_object->smk_known); |
583 | |
584 | seq_putc(m: s, c: ' '); |
585 | |
586 | if (srp->smk_access & MAY_READ) |
587 | seq_putc(m: s, c: 'r'); |
588 | if (srp->smk_access & MAY_WRITE) |
589 | seq_putc(m: s, c: 'w'); |
590 | if (srp->smk_access & MAY_EXEC) |
591 | seq_putc(m: s, c: 'x'); |
592 | if (srp->smk_access & MAY_APPEND) |
593 | seq_putc(m: s, c: 'a'); |
594 | if (srp->smk_access & MAY_TRANSMUTE) |
595 | seq_putc(m: s, c: 't'); |
596 | if (srp->smk_access & MAY_LOCK) |
597 | seq_putc(m: s, c: 'l'); |
598 | if (srp->smk_access & MAY_BRINGUP) |
599 | seq_putc(m: s, c: 'b'); |
600 | |
601 | seq_putc(m: s, c: '\n'); |
602 | } |
603 | |
604 | /* |
605 | * Seq_file read operations for /smack/load |
606 | */ |
607 | |
608 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) |
609 | { |
610 | return smk_seq_start(s, pos, head: &smack_known_list); |
611 | } |
612 | |
613 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) |
614 | { |
615 | return smk_seq_next(s, v, pos, head: &smack_known_list); |
616 | } |
617 | |
618 | static int load_seq_show(struct seq_file *s, void *v) |
619 | { |
620 | struct list_head *list = v; |
621 | struct smack_rule *srp; |
622 | struct smack_known *skp = |
623 | list_entry_rcu(list, struct smack_known, list); |
624 | |
625 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) |
626 | smk_rule_show(s, srp, SMK_LABELLEN); |
627 | |
628 | return 0; |
629 | } |
630 | |
631 | static const struct seq_operations load_seq_ops = { |
632 | .start = load2_seq_start, |
633 | .next = load2_seq_next, |
634 | .show = load_seq_show, |
635 | .stop = smk_seq_stop, |
636 | }; |
637 | |
638 | /** |
639 | * smk_open_load - open() for /smack/load |
640 | * @inode: inode structure representing file |
641 | * @file: "load" file pointer |
642 | * |
643 | * For reading, use load_seq_* seq_file reading operations. |
644 | */ |
645 | static int smk_open_load(struct inode *inode, struct file *file) |
646 | { |
647 | return seq_open(file, &load_seq_ops); |
648 | } |
649 | |
650 | /** |
651 | * smk_write_load - write() for /smack/load |
652 | * @file: file pointer, not actually used |
653 | * @buf: where to get the data from |
654 | * @count: bytes sent |
655 | * @ppos: where to start - must be 0 |
656 | * |
657 | */ |
658 | static ssize_t smk_write_load(struct file *file, const char __user *buf, |
659 | size_t count, loff_t *ppos) |
660 | { |
661 | /* |
662 | * Must have privilege. |
663 | * No partial writes. |
664 | * Enough data must be present. |
665 | */ |
666 | if (!smack_privileged(CAP_MAC_ADMIN)) |
667 | return -EPERM; |
668 | |
669 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
670 | SMK_FIXED24_FMT); |
671 | } |
672 | |
673 | static const struct file_operations smk_load_ops = { |
674 | .open = smk_open_load, |
675 | .read = seq_read, |
676 | .llseek = seq_lseek, |
677 | .write = smk_write_load, |
678 | .release = seq_release, |
679 | }; |
680 | |
681 | /** |
682 | * smk_cipso_doi - initialize the CIPSO domain |
683 | */ |
684 | static void smk_cipso_doi(void) |
685 | { |
686 | int rc; |
687 | struct cipso_v4_doi *doip; |
688 | struct netlbl_audit nai; |
689 | |
690 | smk_netlabel_audit_set(nap: &nai); |
691 | |
692 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, audit_info: &nai); |
693 | if (rc != 0) |
694 | printk(KERN_WARNING "%s:%d remove rc = %d\n" , |
695 | __func__, __LINE__, rc); |
696 | |
697 | doip = kmalloc(size: sizeof(struct cipso_v4_doi), GFP_KERNEL | __GFP_NOFAIL); |
698 | doip->map.std = NULL; |
699 | doip->doi = smk_cipso_doi_value; |
700 | doip->type = CIPSO_V4_MAP_PASS; |
701 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; |
702 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) |
703 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; |
704 | |
705 | rc = netlbl_cfg_cipsov4_add(doi_def: doip, audit_info: &nai); |
706 | if (rc != 0) { |
707 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n" , |
708 | __func__, __LINE__, rc); |
709 | kfree(objp: doip); |
710 | return; |
711 | } |
712 | rc = netlbl_cfg_cipsov4_map_add(doi: doip->doi, NULL, NULL, NULL, audit_info: &nai); |
713 | if (rc != 0) { |
714 | printk(KERN_WARNING "%s:%d map add rc = %d\n" , |
715 | __func__, __LINE__, rc); |
716 | netlbl_cfg_cipsov4_del(doi: doip->doi, audit_info: &nai); |
717 | return; |
718 | } |
719 | } |
720 | |
721 | /** |
722 | * smk_unlbl_ambient - initialize the unlabeled domain |
723 | * @oldambient: previous domain string |
724 | */ |
725 | static void smk_unlbl_ambient(char *oldambient) |
726 | { |
727 | int rc; |
728 | struct netlbl_audit nai; |
729 | |
730 | smk_netlabel_audit_set(nap: &nai); |
731 | |
732 | if (oldambient != NULL) { |
733 | rc = netlbl_cfg_map_del(domain: oldambient, PF_INET, NULL, NULL, audit_info: &nai); |
734 | if (rc != 0) |
735 | printk(KERN_WARNING "%s:%d remove rc = %d\n" , |
736 | __func__, __LINE__, rc); |
737 | } |
738 | if (smack_net_ambient == NULL) |
739 | smack_net_ambient = &smack_known_floor; |
740 | |
741 | rc = netlbl_cfg_unlbl_map_add(domain: smack_net_ambient->smk_known, PF_INET, |
742 | NULL, NULL, audit_info: &nai); |
743 | if (rc != 0) |
744 | printk(KERN_WARNING "%s:%d add rc = %d\n" , |
745 | __func__, __LINE__, rc); |
746 | } |
747 | |
748 | /* |
749 | * Seq_file read operations for /smack/cipso |
750 | */ |
751 | |
752 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) |
753 | { |
754 | return smk_seq_start(s, pos, head: &smack_known_list); |
755 | } |
756 | |
757 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) |
758 | { |
759 | return smk_seq_next(s, v, pos, head: &smack_known_list); |
760 | } |
761 | |
762 | /* |
763 | * Print cipso labels in format: |
764 | * label level[/cat[,cat]] |
765 | */ |
766 | static int cipso_seq_show(struct seq_file *s, void *v) |
767 | { |
768 | struct list_head *list = v; |
769 | struct smack_known *skp = |
770 | list_entry_rcu(list, struct smack_known, list); |
771 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
772 | char sep = '/'; |
773 | int i; |
774 | |
775 | /* |
776 | * Don't show a label that could not have been set using |
777 | * /smack/cipso. This is in support of the notion that |
778 | * anything read from /smack/cipso ought to be writeable |
779 | * to /smack/cipso. |
780 | * |
781 | * /smack/cipso2 should be used instead. |
782 | */ |
783 | if (strlen(skp->smk_known) >= SMK_LABELLEN) |
784 | return 0; |
785 | |
786 | seq_printf(m: s, fmt: "%s %3d" , skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
787 | |
788 | for (i = netlbl_catmap_walk(catmap: cmp, offset: 0); i >= 0; |
789 | i = netlbl_catmap_walk(catmap: cmp, offset: i + 1)) { |
790 | seq_printf(m: s, fmt: "%c%d" , sep, i); |
791 | sep = ','; |
792 | } |
793 | |
794 | seq_putc(m: s, c: '\n'); |
795 | |
796 | return 0; |
797 | } |
798 | |
799 | static const struct seq_operations cipso_seq_ops = { |
800 | .start = cipso_seq_start, |
801 | .next = cipso_seq_next, |
802 | .show = cipso_seq_show, |
803 | .stop = smk_seq_stop, |
804 | }; |
805 | |
806 | /** |
807 | * smk_open_cipso - open() for /smack/cipso |
808 | * @inode: inode structure representing file |
809 | * @file: "cipso" file pointer |
810 | * |
811 | * Connect our cipso_seq_* operations with /smack/cipso |
812 | * file_operations |
813 | */ |
814 | static int smk_open_cipso(struct inode *inode, struct file *file) |
815 | { |
816 | return seq_open(file, &cipso_seq_ops); |
817 | } |
818 | |
819 | /** |
820 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
821 | * @file: file pointer, not actually used |
822 | * @buf: where to get the data from |
823 | * @count: bytes sent |
824 | * @ppos: where to start |
825 | * @format: /smack/cipso or /smack/cipso2 |
826 | * |
827 | * Accepts only one cipso rule per write call. |
828 | * Returns number of bytes written or error code, as appropriate |
829 | */ |
830 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
831 | size_t count, loff_t *ppos, int format) |
832 | { |
833 | struct netlbl_lsm_catmap *old_cat, *new_cat = NULL; |
834 | struct smack_known *skp; |
835 | struct netlbl_lsm_secattr ncats; |
836 | char mapcatset[SMK_CIPSOLEN]; |
837 | int maplevel; |
838 | unsigned int cat; |
839 | int catlen; |
840 | ssize_t rc = -EINVAL; |
841 | char *data = NULL; |
842 | char *rule; |
843 | int ret; |
844 | int i; |
845 | |
846 | /* |
847 | * Must have privilege. |
848 | * No partial writes. |
849 | * Enough data must be present. |
850 | */ |
851 | if (!smack_privileged(CAP_MAC_ADMIN)) |
852 | return -EPERM; |
853 | if (*ppos != 0) |
854 | return -EINVAL; |
855 | if (format == SMK_FIXED24_FMT && |
856 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) |
857 | return -EINVAL; |
858 | if (count > PAGE_SIZE) |
859 | return -EINVAL; |
860 | |
861 | data = memdup_user_nul(buf, count); |
862 | if (IS_ERR(ptr: data)) |
863 | return PTR_ERR(ptr: data); |
864 | |
865 | rule = data; |
866 | /* |
867 | * Only allow one writer at a time. Writes should be |
868 | * quite rare and small in any case. |
869 | */ |
870 | mutex_lock(&smack_cipso_lock); |
871 | |
872 | skp = smk_import_entry(rule, 0); |
873 | if (IS_ERR(ptr: skp)) { |
874 | rc = PTR_ERR(ptr: skp); |
875 | goto out; |
876 | } |
877 | |
878 | if (format == SMK_FIXED24_FMT) |
879 | rule += SMK_LABELLEN; |
880 | else |
881 | rule += strlen(skp->smk_known) + 1; |
882 | |
883 | if (rule > data + count) { |
884 | rc = -EOVERFLOW; |
885 | goto out; |
886 | } |
887 | |
888 | ret = sscanf(rule, "%d" , &maplevel); |
889 | if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL) |
890 | goto out; |
891 | |
892 | rule += SMK_DIGITLEN; |
893 | if (rule > data + count) { |
894 | rc = -EOVERFLOW; |
895 | goto out; |
896 | } |
897 | |
898 | ret = sscanf(rule, "%d" , &catlen); |
899 | if (ret != 1 || catlen < 0 || catlen > SMACK_CIPSO_MAXCATNUM) |
900 | goto out; |
901 | |
902 | if (format == SMK_FIXED24_FMT && |
903 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
904 | goto out; |
905 | |
906 | memset(mapcatset, 0, sizeof(mapcatset)); |
907 | |
908 | for (i = 0; i < catlen; i++) { |
909 | rule += SMK_DIGITLEN; |
910 | if (rule > data + count) { |
911 | rc = -EOVERFLOW; |
912 | goto out; |
913 | } |
914 | ret = sscanf(rule, "%u" , &cat); |
915 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) |
916 | goto out; |
917 | |
918 | smack_catset_bit(cat, catsetp: mapcatset); |
919 | } |
920 | ncats.flags = 0; |
921 | if (catlen == 0) { |
922 | ncats.attr.mls.cat = NULL; |
923 | ncats.attr.mls.lvl = maplevel; |
924 | new_cat = netlbl_catmap_alloc(GFP_ATOMIC); |
925 | if (new_cat) |
926 | new_cat->next = ncats.attr.mls.cat; |
927 | ncats.attr.mls.cat = new_cat; |
928 | skp->smk_netlabel.flags &= ~(1U << 3); |
929 | rc = 0; |
930 | } else { |
931 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
932 | } |
933 | if (rc >= 0) { |
934 | old_cat = skp->smk_netlabel.attr.mls.cat; |
935 | skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; |
936 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; |
937 | synchronize_rcu(); |
938 | netlbl_catmap_free(catmap: old_cat); |
939 | rc = count; |
940 | /* |
941 | * This mapping may have been cached, so clear the cache. |
942 | */ |
943 | netlbl_cache_invalidate(); |
944 | } |
945 | |
946 | out: |
947 | mutex_unlock(lock: &smack_cipso_lock); |
948 | kfree(objp: data); |
949 | return rc; |
950 | } |
951 | |
952 | /** |
953 | * smk_write_cipso - write() for /smack/cipso |
954 | * @file: file pointer, not actually used |
955 | * @buf: where to get the data from |
956 | * @count: bytes sent |
957 | * @ppos: where to start |
958 | * |
959 | * Accepts only one cipso rule per write call. |
960 | * Returns number of bytes written or error code, as appropriate |
961 | */ |
962 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, |
963 | size_t count, loff_t *ppos) |
964 | { |
965 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); |
966 | } |
967 | |
968 | static const struct file_operations smk_cipso_ops = { |
969 | .open = smk_open_cipso, |
970 | .read = seq_read, |
971 | .llseek = seq_lseek, |
972 | .write = smk_write_cipso, |
973 | .release = seq_release, |
974 | }; |
975 | |
976 | /* |
977 | * Seq_file read operations for /smack/cipso2 |
978 | */ |
979 | |
980 | /* |
981 | * Print cipso labels in format: |
982 | * label level[/cat[,cat]] |
983 | */ |
984 | static int cipso2_seq_show(struct seq_file *s, void *v) |
985 | { |
986 | struct list_head *list = v; |
987 | struct smack_known *skp = |
988 | list_entry_rcu(list, struct smack_known, list); |
989 | struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
990 | char sep = '/'; |
991 | int i; |
992 | |
993 | seq_printf(m: s, fmt: "%s %3d" , skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
994 | |
995 | for (i = netlbl_catmap_walk(catmap: cmp, offset: 0); i >= 0; |
996 | i = netlbl_catmap_walk(catmap: cmp, offset: i + 1)) { |
997 | seq_printf(m: s, fmt: "%c%d" , sep, i); |
998 | sep = ','; |
999 | } |
1000 | |
1001 | seq_putc(m: s, c: '\n'); |
1002 | |
1003 | return 0; |
1004 | } |
1005 | |
1006 | static const struct seq_operations cipso2_seq_ops = { |
1007 | .start = cipso_seq_start, |
1008 | .next = cipso_seq_next, |
1009 | .show = cipso2_seq_show, |
1010 | .stop = smk_seq_stop, |
1011 | }; |
1012 | |
1013 | /** |
1014 | * smk_open_cipso2 - open() for /smack/cipso2 |
1015 | * @inode: inode structure representing file |
1016 | * @file: "cipso2" file pointer |
1017 | * |
1018 | * Connect our cipso_seq_* operations with /smack/cipso2 |
1019 | * file_operations |
1020 | */ |
1021 | static int smk_open_cipso2(struct inode *inode, struct file *file) |
1022 | { |
1023 | return seq_open(file, &cipso2_seq_ops); |
1024 | } |
1025 | |
1026 | /** |
1027 | * smk_write_cipso2 - write() for /smack/cipso2 |
1028 | * @file: file pointer, not actually used |
1029 | * @buf: where to get the data from |
1030 | * @count: bytes sent |
1031 | * @ppos: where to start |
1032 | * |
1033 | * Accepts only one cipso rule per write call. |
1034 | * Returns number of bytes written or error code, as appropriate |
1035 | */ |
1036 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, |
1037 | size_t count, loff_t *ppos) |
1038 | { |
1039 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); |
1040 | } |
1041 | |
1042 | static const struct file_operations smk_cipso2_ops = { |
1043 | .open = smk_open_cipso2, |
1044 | .read = seq_read, |
1045 | .llseek = seq_lseek, |
1046 | .write = smk_write_cipso2, |
1047 | .release = seq_release, |
1048 | }; |
1049 | |
1050 | /* |
1051 | * Seq_file read operations for /smack/netlabel |
1052 | */ |
1053 | |
1054 | static void *net4addr_seq_start(struct seq_file *s, loff_t *pos) |
1055 | { |
1056 | return smk_seq_start(s, pos, head: &smk_net4addr_list); |
1057 | } |
1058 | |
1059 | static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
1060 | { |
1061 | return smk_seq_next(s, v, pos, head: &smk_net4addr_list); |
1062 | } |
1063 | |
1064 | /* |
1065 | * Print host/label pairs |
1066 | */ |
1067 | static int net4addr_seq_show(struct seq_file *s, void *v) |
1068 | { |
1069 | struct list_head *list = v; |
1070 | struct smk_net4addr *skp = |
1071 | list_entry_rcu(list, struct smk_net4addr, list); |
1072 | char *kp = SMACK_CIPSO_OPTION; |
1073 | |
1074 | if (skp->smk_label != NULL) |
1075 | kp = skp->smk_label->smk_known; |
1076 | seq_printf(m: s, fmt: "%pI4/%d %s\n" , &skp->smk_host.s_addr, |
1077 | skp->smk_masks, kp); |
1078 | |
1079 | return 0; |
1080 | } |
1081 | |
1082 | static const struct seq_operations net4addr_seq_ops = { |
1083 | .start = net4addr_seq_start, |
1084 | .next = net4addr_seq_next, |
1085 | .show = net4addr_seq_show, |
1086 | .stop = smk_seq_stop, |
1087 | }; |
1088 | |
1089 | /** |
1090 | * smk_open_net4addr - open() for /smack/netlabel |
1091 | * @inode: inode structure representing file |
1092 | * @file: "netlabel" file pointer |
1093 | * |
1094 | * Connect our net4addr_seq_* operations with /smack/netlabel |
1095 | * file_operations |
1096 | */ |
1097 | static int smk_open_net4addr(struct inode *inode, struct file *file) |
1098 | { |
1099 | return seq_open(file, &net4addr_seq_ops); |
1100 | } |
1101 | |
1102 | /** |
1103 | * smk_net4addr_insert |
1104 | * @new : netlabel to insert |
1105 | * |
1106 | * This helper insert netlabel in the smack_net4addrs list |
1107 | * sorted by netmask length (longest to smallest) |
1108 | * locked by &smk_net4addr_lock in smk_write_net4addr |
1109 | * |
1110 | */ |
1111 | static void smk_net4addr_insert(struct smk_net4addr *new) |
1112 | { |
1113 | struct smk_net4addr *m; |
1114 | struct smk_net4addr *m_next; |
1115 | |
1116 | if (list_empty(head: &smk_net4addr_list)) { |
1117 | list_add_rcu(new: &new->list, head: &smk_net4addr_list); |
1118 | return; |
1119 | } |
1120 | |
1121 | m = list_entry_rcu(smk_net4addr_list.next, |
1122 | struct smk_net4addr, list); |
1123 | |
1124 | /* the comparison '>' is a bit hacky, but works */ |
1125 | if (new->smk_masks > m->smk_masks) { |
1126 | list_add_rcu(new: &new->list, head: &smk_net4addr_list); |
1127 | return; |
1128 | } |
1129 | |
1130 | list_for_each_entry_rcu(m, &smk_net4addr_list, list) { |
1131 | if (list_is_last(list: &m->list, head: &smk_net4addr_list)) { |
1132 | list_add_rcu(new: &new->list, head: &m->list); |
1133 | return; |
1134 | } |
1135 | m_next = list_entry_rcu(m->list.next, |
1136 | struct smk_net4addr, list); |
1137 | if (new->smk_masks > m_next->smk_masks) { |
1138 | list_add_rcu(new: &new->list, head: &m->list); |
1139 | return; |
1140 | } |
1141 | } |
1142 | } |
1143 | |
1144 | |
1145 | /** |
1146 | * smk_write_net4addr - write() for /smack/netlabel |
1147 | * @file: file pointer, not actually used |
1148 | * @buf: where to get the data from |
1149 | * @count: bytes sent |
1150 | * @ppos: where to start |
1151 | * |
1152 | * Accepts only one net4addr per write call. |
1153 | * Returns number of bytes written or error code, as appropriate |
1154 | */ |
1155 | static ssize_t smk_write_net4addr(struct file *file, const char __user *buf, |
1156 | size_t count, loff_t *ppos) |
1157 | { |
1158 | struct smk_net4addr *snp; |
1159 | struct sockaddr_in newname; |
1160 | char *smack; |
1161 | struct smack_known *skp = NULL; |
1162 | char *data; |
1163 | char *host = (char *)&newname.sin_addr.s_addr; |
1164 | int rc; |
1165 | struct netlbl_audit audit_info; |
1166 | struct in_addr mask; |
1167 | unsigned int m; |
1168 | unsigned int masks; |
1169 | int found; |
1170 | u32 mask_bits = (1<<31); |
1171 | __be32 nsa; |
1172 | u32 temp_mask; |
1173 | |
1174 | /* |
1175 | * Must have privilege. |
1176 | * No partial writes. |
1177 | * Enough data must be present. |
1178 | * "<addr/mask, as a.b.c.d/e><space><label>" |
1179 | * "<addr, as a.b.c.d><space><label>" |
1180 | */ |
1181 | if (!smack_privileged(CAP_MAC_ADMIN)) |
1182 | return -EPERM; |
1183 | if (*ppos != 0) |
1184 | return -EINVAL; |
1185 | if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) |
1186 | return -EINVAL; |
1187 | |
1188 | data = memdup_user_nul(buf, count); |
1189 | if (IS_ERR(ptr: data)) |
1190 | return PTR_ERR(ptr: data); |
1191 | |
1192 | smack = kzalloc(size: count + 1, GFP_KERNEL); |
1193 | if (smack == NULL) { |
1194 | rc = -ENOMEM; |
1195 | goto free_data_out; |
1196 | } |
1197 | |
1198 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s" , |
1199 | &host[0], &host[1], &host[2], &host[3], &masks, smack); |
1200 | if (rc != 6) { |
1201 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s" , |
1202 | &host[0], &host[1], &host[2], &host[3], smack); |
1203 | if (rc != 5) { |
1204 | rc = -EINVAL; |
1205 | goto free_out; |
1206 | } |
1207 | masks = 32; |
1208 | } |
1209 | if (masks > BEBITS) { |
1210 | rc = -EINVAL; |
1211 | goto free_out; |
1212 | } |
1213 | |
1214 | /* |
1215 | * If smack begins with '-', it is an option, don't import it |
1216 | */ |
1217 | if (smack[0] != '-') { |
1218 | skp = smk_import_entry(smack, 0); |
1219 | if (IS_ERR(ptr: skp)) { |
1220 | rc = PTR_ERR(ptr: skp); |
1221 | goto free_out; |
1222 | } |
1223 | } else { |
1224 | /* |
1225 | * Only the -CIPSO option is supported for IPv4 |
1226 | */ |
1227 | if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) { |
1228 | rc = -EINVAL; |
1229 | goto free_out; |
1230 | } |
1231 | } |
1232 | |
1233 | for (m = masks, temp_mask = 0; m > 0; m--) { |
1234 | temp_mask |= mask_bits; |
1235 | mask_bits >>= 1; |
1236 | } |
1237 | mask.s_addr = cpu_to_be32(temp_mask); |
1238 | |
1239 | newname.sin_addr.s_addr &= mask.s_addr; |
1240 | /* |
1241 | * Only allow one writer at a time. Writes should be |
1242 | * quite rare and small in any case. |
1243 | */ |
1244 | mutex_lock(&smk_net4addr_lock); |
1245 | |
1246 | nsa = newname.sin_addr.s_addr; |
1247 | /* try to find if the prefix is already in the list */ |
1248 | found = 0; |
1249 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) { |
1250 | if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) { |
1251 | found = 1; |
1252 | break; |
1253 | } |
1254 | } |
1255 | smk_netlabel_audit_set(nap: &audit_info); |
1256 | |
1257 | if (found == 0) { |
1258 | snp = kzalloc(size: sizeof(*snp), GFP_KERNEL); |
1259 | if (snp == NULL) |
1260 | rc = -ENOMEM; |
1261 | else { |
1262 | rc = 0; |
1263 | snp->smk_host.s_addr = newname.sin_addr.s_addr; |
1264 | snp->smk_mask.s_addr = mask.s_addr; |
1265 | snp->smk_label = skp; |
1266 | snp->smk_masks = masks; |
1267 | smk_net4addr_insert(new: snp); |
1268 | } |
1269 | } else { |
1270 | /* |
1271 | * Delete the unlabeled entry, only if the previous label |
1272 | * wasn't the special CIPSO option |
1273 | */ |
1274 | if (snp->smk_label != NULL) |
1275 | rc = netlbl_cfg_unlbl_static_del(net: &init_net, NULL, |
1276 | addr: &snp->smk_host, mask: &snp->smk_mask, |
1277 | PF_INET, audit_info: &audit_info); |
1278 | else |
1279 | rc = 0; |
1280 | snp->smk_label = skp; |
1281 | } |
1282 | |
1283 | /* |
1284 | * Now tell netlabel about the single label nature of |
1285 | * this host so that incoming packets get labeled. |
1286 | * but only if we didn't get the special CIPSO option |
1287 | */ |
1288 | if (rc == 0 && skp != NULL) |
1289 | rc = netlbl_cfg_unlbl_static_add(net: &init_net, NULL, |
1290 | addr: &snp->smk_host, mask: &snp->smk_mask, PF_INET, |
1291 | secid: snp->smk_label->smk_secid, audit_info: &audit_info); |
1292 | |
1293 | if (rc == 0) |
1294 | rc = count; |
1295 | |
1296 | mutex_unlock(lock: &smk_net4addr_lock); |
1297 | |
1298 | free_out: |
1299 | kfree(objp: smack); |
1300 | free_data_out: |
1301 | kfree(objp: data); |
1302 | |
1303 | return rc; |
1304 | } |
1305 | |
1306 | static const struct file_operations smk_net4addr_ops = { |
1307 | .open = smk_open_net4addr, |
1308 | .read = seq_read, |
1309 | .llseek = seq_lseek, |
1310 | .write = smk_write_net4addr, |
1311 | .release = seq_release, |
1312 | }; |
1313 | |
1314 | #if IS_ENABLED(CONFIG_IPV6) |
1315 | /* |
1316 | * Seq_file read operations for /smack/netlabel6 |
1317 | */ |
1318 | |
1319 | static void *net6addr_seq_start(struct seq_file *s, loff_t *pos) |
1320 | { |
1321 | return smk_seq_start(s, pos, head: &smk_net6addr_list); |
1322 | } |
1323 | |
1324 | static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
1325 | { |
1326 | return smk_seq_next(s, v, pos, head: &smk_net6addr_list); |
1327 | } |
1328 | |
1329 | /* |
1330 | * Print host/label pairs |
1331 | */ |
1332 | static int net6addr_seq_show(struct seq_file *s, void *v) |
1333 | { |
1334 | struct list_head *list = v; |
1335 | struct smk_net6addr *skp = |
1336 | list_entry(list, struct smk_net6addr, list); |
1337 | |
1338 | if (skp->smk_label != NULL) |
1339 | seq_printf(m: s, fmt: "%pI6/%d %s\n" , &skp->smk_host, skp->smk_masks, |
1340 | skp->smk_label->smk_known); |
1341 | |
1342 | return 0; |
1343 | } |
1344 | |
1345 | static const struct seq_operations net6addr_seq_ops = { |
1346 | .start = net6addr_seq_start, |
1347 | .next = net6addr_seq_next, |
1348 | .show = net6addr_seq_show, |
1349 | .stop = smk_seq_stop, |
1350 | }; |
1351 | |
1352 | /** |
1353 | * smk_open_net6addr - open() for /smack/netlabel |
1354 | * @inode: inode structure representing file |
1355 | * @file: "netlabel" file pointer |
1356 | * |
1357 | * Connect our net6addr_seq_* operations with /smack/netlabel |
1358 | * file_operations |
1359 | */ |
1360 | static int smk_open_net6addr(struct inode *inode, struct file *file) |
1361 | { |
1362 | return seq_open(file, &net6addr_seq_ops); |
1363 | } |
1364 | |
1365 | /** |
1366 | * smk_net6addr_insert |
1367 | * @new : entry to insert |
1368 | * |
1369 | * This inserts an entry in the smack_net6addrs list |
1370 | * sorted by netmask length (longest to smallest) |
1371 | * locked by &smk_net6addr_lock in smk_write_net6addr |
1372 | * |
1373 | */ |
1374 | static void smk_net6addr_insert(struct smk_net6addr *new) |
1375 | { |
1376 | struct smk_net6addr *m_next; |
1377 | struct smk_net6addr *m; |
1378 | |
1379 | if (list_empty(head: &smk_net6addr_list)) { |
1380 | list_add_rcu(new: &new->list, head: &smk_net6addr_list); |
1381 | return; |
1382 | } |
1383 | |
1384 | m = list_entry_rcu(smk_net6addr_list.next, |
1385 | struct smk_net6addr, list); |
1386 | |
1387 | if (new->smk_masks > m->smk_masks) { |
1388 | list_add_rcu(new: &new->list, head: &smk_net6addr_list); |
1389 | return; |
1390 | } |
1391 | |
1392 | list_for_each_entry_rcu(m, &smk_net6addr_list, list) { |
1393 | if (list_is_last(list: &m->list, head: &smk_net6addr_list)) { |
1394 | list_add_rcu(new: &new->list, head: &m->list); |
1395 | return; |
1396 | } |
1397 | m_next = list_entry_rcu(m->list.next, |
1398 | struct smk_net6addr, list); |
1399 | if (new->smk_masks > m_next->smk_masks) { |
1400 | list_add_rcu(new: &new->list, head: &m->list); |
1401 | return; |
1402 | } |
1403 | } |
1404 | } |
1405 | |
1406 | |
1407 | /** |
1408 | * smk_write_net6addr - write() for /smack/netlabel |
1409 | * @file: file pointer, not actually used |
1410 | * @buf: where to get the data from |
1411 | * @count: bytes sent |
1412 | * @ppos: where to start |
1413 | * |
1414 | * Accepts only one net6addr per write call. |
1415 | * Returns number of bytes written or error code, as appropriate |
1416 | */ |
1417 | static ssize_t smk_write_net6addr(struct file *file, const char __user *buf, |
1418 | size_t count, loff_t *ppos) |
1419 | { |
1420 | struct smk_net6addr *snp; |
1421 | struct in6_addr newname; |
1422 | struct in6_addr fullmask; |
1423 | struct smack_known *skp = NULL; |
1424 | char *smack; |
1425 | char *data; |
1426 | int rc = 0; |
1427 | int found = 0; |
1428 | int i; |
1429 | unsigned int scanned[8]; |
1430 | unsigned int m; |
1431 | unsigned int mask = 128; |
1432 | |
1433 | /* |
1434 | * Must have privilege. |
1435 | * No partial writes. |
1436 | * Enough data must be present. |
1437 | * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>" |
1438 | * "<addr, as a:b:c:d:e:f:g:h><space><label>" |
1439 | */ |
1440 | if (!smack_privileged(CAP_MAC_ADMIN)) |
1441 | return -EPERM; |
1442 | if (*ppos != 0) |
1443 | return -EINVAL; |
1444 | if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) |
1445 | return -EINVAL; |
1446 | |
1447 | data = memdup_user_nul(buf, count); |
1448 | if (IS_ERR(ptr: data)) |
1449 | return PTR_ERR(ptr: data); |
1450 | |
1451 | smack = kzalloc(size: count + 1, GFP_KERNEL); |
1452 | if (smack == NULL) { |
1453 | rc = -ENOMEM; |
1454 | goto free_data_out; |
1455 | } |
1456 | |
1457 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s" , |
1458 | &scanned[0], &scanned[1], &scanned[2], &scanned[3], |
1459 | &scanned[4], &scanned[5], &scanned[6], &scanned[7], |
1460 | &mask, smack); |
1461 | if (i != 10) { |
1462 | i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s" , |
1463 | &scanned[0], &scanned[1], &scanned[2], |
1464 | &scanned[3], &scanned[4], &scanned[5], |
1465 | &scanned[6], &scanned[7], smack); |
1466 | if (i != 9) { |
1467 | rc = -EINVAL; |
1468 | goto free_out; |
1469 | } |
1470 | } |
1471 | if (mask > 128) { |
1472 | rc = -EINVAL; |
1473 | goto free_out; |
1474 | } |
1475 | for (i = 0; i < 8; i++) { |
1476 | if (scanned[i] > 0xffff) { |
1477 | rc = -EINVAL; |
1478 | goto free_out; |
1479 | } |
1480 | newname.s6_addr16[i] = htons(scanned[i]); |
1481 | } |
1482 | |
1483 | /* |
1484 | * If smack begins with '-', it is an option, don't import it |
1485 | */ |
1486 | if (smack[0] != '-') { |
1487 | skp = smk_import_entry(smack, 0); |
1488 | if (IS_ERR(ptr: skp)) { |
1489 | rc = PTR_ERR(ptr: skp); |
1490 | goto free_out; |
1491 | } |
1492 | } else { |
1493 | /* |
1494 | * Only -DELETE is supported for IPv6 |
1495 | */ |
1496 | if (strcmp(smack, SMACK_DELETE_OPTION) != 0) { |
1497 | rc = -EINVAL; |
1498 | goto free_out; |
1499 | } |
1500 | } |
1501 | |
1502 | for (i = 0, m = mask; i < 8; i++) { |
1503 | if (m >= 16) { |
1504 | fullmask.s6_addr16[i] = 0xffff; |
1505 | m -= 16; |
1506 | } else if (m > 0) { |
1507 | fullmask.s6_addr16[i] = (1 << m) - 1; |
1508 | m = 0; |
1509 | } else |
1510 | fullmask.s6_addr16[i] = 0; |
1511 | newname.s6_addr16[i] &= fullmask.s6_addr16[i]; |
1512 | } |
1513 | |
1514 | /* |
1515 | * Only allow one writer at a time. Writes should be |
1516 | * quite rare and small in any case. |
1517 | */ |
1518 | mutex_lock(&smk_net6addr_lock); |
1519 | /* |
1520 | * Try to find the prefix in the list |
1521 | */ |
1522 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { |
1523 | if (mask != snp->smk_masks) |
1524 | continue; |
1525 | for (found = 1, i = 0; i < 8; i++) { |
1526 | if (newname.s6_addr16[i] != |
1527 | snp->smk_host.s6_addr16[i]) { |
1528 | found = 0; |
1529 | break; |
1530 | } |
1531 | } |
1532 | if (found == 1) |
1533 | break; |
1534 | } |
1535 | if (found == 0) { |
1536 | snp = kzalloc(size: sizeof(*snp), GFP_KERNEL); |
1537 | if (snp == NULL) |
1538 | rc = -ENOMEM; |
1539 | else { |
1540 | snp->smk_host = newname; |
1541 | snp->smk_mask = fullmask; |
1542 | snp->smk_masks = mask; |
1543 | snp->smk_label = skp; |
1544 | smk_net6addr_insert(new: snp); |
1545 | } |
1546 | } else { |
1547 | snp->smk_label = skp; |
1548 | } |
1549 | |
1550 | if (rc == 0) |
1551 | rc = count; |
1552 | |
1553 | mutex_unlock(lock: &smk_net6addr_lock); |
1554 | |
1555 | free_out: |
1556 | kfree(objp: smack); |
1557 | free_data_out: |
1558 | kfree(objp: data); |
1559 | |
1560 | return rc; |
1561 | } |
1562 | |
1563 | static const struct file_operations smk_net6addr_ops = { |
1564 | .open = smk_open_net6addr, |
1565 | .read = seq_read, |
1566 | .llseek = seq_lseek, |
1567 | .write = smk_write_net6addr, |
1568 | .release = seq_release, |
1569 | }; |
1570 | #endif /* CONFIG_IPV6 */ |
1571 | |
1572 | /** |
1573 | * smk_read_doi - read() for /smack/doi |
1574 | * @filp: file pointer, not actually used |
1575 | * @buf: where to put the result |
1576 | * @count: maximum to send along |
1577 | * @ppos: where to start |
1578 | * |
1579 | * Returns number of bytes read or error code, as appropriate |
1580 | */ |
1581 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, |
1582 | size_t count, loff_t *ppos) |
1583 | { |
1584 | char temp[80]; |
1585 | ssize_t rc; |
1586 | |
1587 | if (*ppos != 0) |
1588 | return 0; |
1589 | |
1590 | sprintf(buf: temp, fmt: "%d" , smk_cipso_doi_value); |
1591 | rc = simple_read_from_buffer(to: buf, count, ppos, from: temp, strlen(temp)); |
1592 | |
1593 | return rc; |
1594 | } |
1595 | |
1596 | /** |
1597 | * smk_write_doi - write() for /smack/doi |
1598 | * @file: file pointer, not actually used |
1599 | * @buf: where to get the data from |
1600 | * @count: bytes sent |
1601 | * @ppos: where to start |
1602 | * |
1603 | * Returns number of bytes written or error code, as appropriate |
1604 | */ |
1605 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, |
1606 | size_t count, loff_t *ppos) |
1607 | { |
1608 | char temp[80]; |
1609 | int i; |
1610 | |
1611 | if (!smack_privileged(CAP_MAC_ADMIN)) |
1612 | return -EPERM; |
1613 | |
1614 | if (count >= sizeof(temp) || count == 0) |
1615 | return -EINVAL; |
1616 | |
1617 | if (copy_from_user(to: temp, from: buf, n: count) != 0) |
1618 | return -EFAULT; |
1619 | |
1620 | temp[count] = '\0'; |
1621 | |
1622 | if (sscanf(temp, "%d" , &i) != 1) |
1623 | return -EINVAL; |
1624 | |
1625 | smk_cipso_doi_value = i; |
1626 | |
1627 | smk_cipso_doi(); |
1628 | |
1629 | return count; |
1630 | } |
1631 | |
1632 | static const struct file_operations smk_doi_ops = { |
1633 | .read = smk_read_doi, |
1634 | .write = smk_write_doi, |
1635 | .llseek = default_llseek, |
1636 | }; |
1637 | |
1638 | /** |
1639 | * smk_read_direct - read() for /smack/direct |
1640 | * @filp: file pointer, not actually used |
1641 | * @buf: where to put the result |
1642 | * @count: maximum to send along |
1643 | * @ppos: where to start |
1644 | * |
1645 | * Returns number of bytes read or error code, as appropriate |
1646 | */ |
1647 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, |
1648 | size_t count, loff_t *ppos) |
1649 | { |
1650 | char temp[80]; |
1651 | ssize_t rc; |
1652 | |
1653 | if (*ppos != 0) |
1654 | return 0; |
1655 | |
1656 | sprintf(buf: temp, fmt: "%d" , smack_cipso_direct); |
1657 | rc = simple_read_from_buffer(to: buf, count, ppos, from: temp, strlen(temp)); |
1658 | |
1659 | return rc; |
1660 | } |
1661 | |
1662 | /** |
1663 | * smk_write_direct - write() for /smack/direct |
1664 | * @file: file pointer, not actually used |
1665 | * @buf: where to get the data from |
1666 | * @count: bytes sent |
1667 | * @ppos: where to start |
1668 | * |
1669 | * Returns number of bytes written or error code, as appropriate |
1670 | */ |
1671 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, |
1672 | size_t count, loff_t *ppos) |
1673 | { |
1674 | struct smack_known *skp; |
1675 | char temp[80]; |
1676 | int i; |
1677 | |
1678 | if (!smack_privileged(CAP_MAC_ADMIN)) |
1679 | return -EPERM; |
1680 | |
1681 | if (count >= sizeof(temp) || count == 0) |
1682 | return -EINVAL; |
1683 | |
1684 | if (copy_from_user(to: temp, from: buf, n: count) != 0) |
1685 | return -EFAULT; |
1686 | |
1687 | temp[count] = '\0'; |
1688 | |
1689 | if (sscanf(temp, "%d" , &i) != 1) |
1690 | return -EINVAL; |
1691 | |
1692 | /* |
1693 | * Don't do anything if the value hasn't actually changed. |
1694 | * If it is changing reset the level on entries that were |
1695 | * set up to be direct when they were created. |
1696 | */ |
1697 | if (smack_cipso_direct != i) { |
1698 | mutex_lock(&smack_known_lock); |
1699 | list_for_each_entry_rcu(skp, &smack_known_list, list) |
1700 | if (skp->smk_netlabel.attr.mls.lvl == |
1701 | smack_cipso_direct) |
1702 | skp->smk_netlabel.attr.mls.lvl = i; |
1703 | smack_cipso_direct = i; |
1704 | mutex_unlock(lock: &smack_known_lock); |
1705 | } |
1706 | |
1707 | return count; |
1708 | } |
1709 | |
1710 | static const struct file_operations smk_direct_ops = { |
1711 | .read = smk_read_direct, |
1712 | .write = smk_write_direct, |
1713 | .llseek = default_llseek, |
1714 | }; |
1715 | |
1716 | /** |
1717 | * smk_read_mapped - read() for /smack/mapped |
1718 | * @filp: file pointer, not actually used |
1719 | * @buf: where to put the result |
1720 | * @count: maximum to send along |
1721 | * @ppos: where to start |
1722 | * |
1723 | * Returns number of bytes read or error code, as appropriate |
1724 | */ |
1725 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, |
1726 | size_t count, loff_t *ppos) |
1727 | { |
1728 | char temp[80]; |
1729 | ssize_t rc; |
1730 | |
1731 | if (*ppos != 0) |
1732 | return 0; |
1733 | |
1734 | sprintf(buf: temp, fmt: "%d" , smack_cipso_mapped); |
1735 | rc = simple_read_from_buffer(to: buf, count, ppos, from: temp, strlen(temp)); |
1736 | |
1737 | return rc; |
1738 | } |
1739 | |
1740 | /** |
1741 | * smk_write_mapped - write() for /smack/mapped |
1742 | * @file: file pointer, not actually used |
1743 | * @buf: where to get the data from |
1744 | * @count: bytes sent |
1745 | * @ppos: where to start |
1746 | * |
1747 | * Returns number of bytes written or error code, as appropriate |
1748 | */ |
1749 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, |
1750 | size_t count, loff_t *ppos) |
1751 | { |
1752 | struct smack_known *skp; |
1753 | char temp[80]; |
1754 | int i; |
1755 | |
1756 | if (!smack_privileged(CAP_MAC_ADMIN)) |
1757 | return -EPERM; |
1758 | |
1759 | if (count >= sizeof(temp) || count == 0) |
1760 | return -EINVAL; |
1761 | |
1762 | if (copy_from_user(to: temp, from: buf, n: count) != 0) |
1763 | return -EFAULT; |
1764 | |
1765 | temp[count] = '\0'; |
1766 | |
1767 | if (sscanf(temp, "%d" , &i) != 1) |
1768 | return -EINVAL; |
1769 | |
1770 | /* |
1771 | * Don't do anything if the value hasn't actually changed. |
1772 | * If it is changing reset the level on entries that were |
1773 | * set up to be mapped when they were created. |
1774 | */ |
1775 | if (smack_cipso_mapped != i) { |
1776 | mutex_lock(&smack_known_lock); |
1777 | list_for_each_entry_rcu(skp, &smack_known_list, list) |
1778 | if (skp->smk_netlabel.attr.mls.lvl == |
1779 | smack_cipso_mapped) |
1780 | skp->smk_netlabel.attr.mls.lvl = i; |
1781 | smack_cipso_mapped = i; |
1782 | mutex_unlock(lock: &smack_known_lock); |
1783 | } |
1784 | |
1785 | return count; |
1786 | } |
1787 | |
1788 | static const struct file_operations smk_mapped_ops = { |
1789 | .read = smk_read_mapped, |
1790 | .write = smk_write_mapped, |
1791 | .llseek = default_llseek, |
1792 | }; |
1793 | |
1794 | /** |
1795 | * smk_read_ambient - read() for /smack/ambient |
1796 | * @filp: file pointer, not actually used |
1797 | * @buf: where to put the result |
1798 | * @cn: maximum to send along |
1799 | * @ppos: where to start |
1800 | * |
1801 | * Returns number of bytes read or error code, as appropriate |
1802 | */ |
1803 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, |
1804 | size_t cn, loff_t *ppos) |
1805 | { |
1806 | ssize_t rc; |
1807 | int asize; |
1808 | |
1809 | if (*ppos != 0) |
1810 | return 0; |
1811 | /* |
1812 | * Being careful to avoid a problem in the case where |
1813 | * smack_net_ambient gets changed in midstream. |
1814 | */ |
1815 | mutex_lock(&smack_ambient_lock); |
1816 | |
1817 | asize = strlen(smack_net_ambient->smk_known) + 1; |
1818 | |
1819 | if (cn >= asize) |
1820 | rc = simple_read_from_buffer(to: buf, count: cn, ppos, |
1821 | from: smack_net_ambient->smk_known, |
1822 | available: asize); |
1823 | else |
1824 | rc = -EINVAL; |
1825 | |
1826 | mutex_unlock(lock: &smack_ambient_lock); |
1827 | |
1828 | return rc; |
1829 | } |
1830 | |
1831 | /** |
1832 | * smk_write_ambient - write() for /smack/ambient |
1833 | * @file: file pointer, not actually used |
1834 | * @buf: where to get the data from |
1835 | * @count: bytes sent |
1836 | * @ppos: where to start |
1837 | * |
1838 | * Returns number of bytes written or error code, as appropriate |
1839 | */ |
1840 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, |
1841 | size_t count, loff_t *ppos) |
1842 | { |
1843 | struct smack_known *skp; |
1844 | char *oldambient; |
1845 | char *data; |
1846 | int rc = count; |
1847 | |
1848 | if (!smack_privileged(CAP_MAC_ADMIN)) |
1849 | return -EPERM; |
1850 | |
1851 | /* Enough data must be present */ |
1852 | if (count == 0 || count > PAGE_SIZE) |
1853 | return -EINVAL; |
1854 | |
1855 | data = memdup_user_nul(buf, count); |
1856 | if (IS_ERR(ptr: data)) |
1857 | return PTR_ERR(ptr: data); |
1858 | |
1859 | skp = smk_import_entry(data, count); |
1860 | if (IS_ERR(ptr: skp)) { |
1861 | rc = PTR_ERR(ptr: skp); |
1862 | goto out; |
1863 | } |
1864 | |
1865 | mutex_lock(&smack_ambient_lock); |
1866 | |
1867 | oldambient = smack_net_ambient->smk_known; |
1868 | smack_net_ambient = skp; |
1869 | smk_unlbl_ambient(oldambient); |
1870 | |
1871 | mutex_unlock(lock: &smack_ambient_lock); |
1872 | |
1873 | out: |
1874 | kfree(objp: data); |
1875 | return rc; |
1876 | } |
1877 | |
1878 | static const struct file_operations smk_ambient_ops = { |
1879 | .read = smk_read_ambient, |
1880 | .write = smk_write_ambient, |
1881 | .llseek = default_llseek, |
1882 | }; |
1883 | |
1884 | /* |
1885 | * Seq_file operations for /smack/onlycap |
1886 | */ |
1887 | static void *onlycap_seq_start(struct seq_file *s, loff_t *pos) |
1888 | { |
1889 | return smk_seq_start(s, pos, head: &smack_onlycap_list); |
1890 | } |
1891 | |
1892 | static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos) |
1893 | { |
1894 | return smk_seq_next(s, v, pos, head: &smack_onlycap_list); |
1895 | } |
1896 | |
1897 | static int onlycap_seq_show(struct seq_file *s, void *v) |
1898 | { |
1899 | struct list_head *list = v; |
1900 | struct smack_known_list_elem *sklep = |
1901 | list_entry_rcu(list, struct smack_known_list_elem, list); |
1902 | |
1903 | seq_puts(m: s, s: sklep->smk_label->smk_known); |
1904 | seq_putc(m: s, c: ' '); |
1905 | |
1906 | return 0; |
1907 | } |
1908 | |
1909 | static const struct seq_operations onlycap_seq_ops = { |
1910 | .start = onlycap_seq_start, |
1911 | .next = onlycap_seq_next, |
1912 | .show = onlycap_seq_show, |
1913 | .stop = smk_seq_stop, |
1914 | }; |
1915 | |
1916 | static int smk_open_onlycap(struct inode *inode, struct file *file) |
1917 | { |
1918 | return seq_open(file, &onlycap_seq_ops); |
1919 | } |
1920 | |
1921 | /** |
1922 | * smk_list_swap_rcu - swap public list with a private one in RCU-safe way |
1923 | * The caller must hold appropriate mutex to prevent concurrent modifications |
1924 | * to the public list. |
1925 | * Private list is assumed to be not accessible to other threads yet. |
1926 | * |
1927 | * @public: public list |
1928 | * @private: private list |
1929 | */ |
1930 | static void smk_list_swap_rcu(struct list_head *public, |
1931 | struct list_head *private) |
1932 | { |
1933 | struct list_head *first, *last; |
1934 | |
1935 | if (list_empty(head: public)) { |
1936 | list_splice_init_rcu(list: private, head: public, sync: synchronize_rcu); |
1937 | } else { |
1938 | /* Remember public list before replacing it */ |
1939 | first = public->next; |
1940 | last = public->prev; |
1941 | |
1942 | /* Publish private list in place of public in RCU-safe way */ |
1943 | private->prev->next = public; |
1944 | private->next->prev = public; |
1945 | rcu_assign_pointer(public->next, private->next); |
1946 | public->prev = private->prev; |
1947 | |
1948 | synchronize_rcu(); |
1949 | |
1950 | /* When all readers are done with the old public list, |
1951 | * attach it in place of private */ |
1952 | private->next = first; |
1953 | private->prev = last; |
1954 | first->prev = private; |
1955 | last->next = private; |
1956 | } |
1957 | } |
1958 | |
1959 | /** |
1960 | * smk_parse_label_list - parse list of Smack labels, separated by spaces |
1961 | * |
1962 | * @data: the string to parse |
1963 | * @list: destination list |
1964 | * |
1965 | * Returns zero on success or error code, as appropriate |
1966 | */ |
1967 | static int smk_parse_label_list(char *data, struct list_head *list) |
1968 | { |
1969 | char *tok; |
1970 | struct smack_known *skp; |
1971 | struct smack_known_list_elem *sklep; |
1972 | |
1973 | while ((tok = strsep(&data, " " )) != NULL) { |
1974 | if (!*tok) |
1975 | continue; |
1976 | |
1977 | skp = smk_import_entry(tok, 0); |
1978 | if (IS_ERR(ptr: skp)) |
1979 | return PTR_ERR(ptr: skp); |
1980 | |
1981 | sklep = kzalloc(size: sizeof(*sklep), GFP_KERNEL); |
1982 | if (sklep == NULL) |
1983 | return -ENOMEM; |
1984 | |
1985 | sklep->smk_label = skp; |
1986 | list_add(new: &sklep->list, head: list); |
1987 | } |
1988 | |
1989 | return 0; |
1990 | } |
1991 | |
1992 | /** |
1993 | * smk_destroy_label_list - destroy a list of smack_known_list_elem |
1994 | * @list: header pointer of the list to destroy |
1995 | */ |
1996 | void smk_destroy_label_list(struct list_head *list) |
1997 | { |
1998 | struct smack_known_list_elem *sklep; |
1999 | struct smack_known_list_elem *sklep2; |
2000 | |
2001 | list_for_each_entry_safe(sklep, sklep2, list, list) |
2002 | kfree(objp: sklep); |
2003 | |
2004 | INIT_LIST_HEAD(list); |
2005 | } |
2006 | |
2007 | /** |
2008 | * smk_write_onlycap - write() for smackfs/onlycap |
2009 | * @file: file pointer, not actually used |
2010 | * @buf: where to get the data from |
2011 | * @count: bytes sent |
2012 | * @ppos: where to start |
2013 | * |
2014 | * Returns number of bytes written or error code, as appropriate |
2015 | */ |
2016 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, |
2017 | size_t count, loff_t *ppos) |
2018 | { |
2019 | char *data; |
2020 | LIST_HEAD(list_tmp); |
2021 | int rc; |
2022 | |
2023 | if (!smack_privileged(CAP_MAC_ADMIN)) |
2024 | return -EPERM; |
2025 | |
2026 | if (count > PAGE_SIZE) |
2027 | return -EINVAL; |
2028 | |
2029 | data = memdup_user_nul(buf, count); |
2030 | if (IS_ERR(ptr: data)) |
2031 | return PTR_ERR(ptr: data); |
2032 | |
2033 | rc = smk_parse_label_list(data, list: &list_tmp); |
2034 | kfree(objp: data); |
2035 | |
2036 | /* |
2037 | * Clear the smack_onlycap on invalid label errors. This means |
2038 | * that we can pass a null string to unset the onlycap value. |
2039 | * |
2040 | * Importing will also reject a label beginning with '-', |
2041 | * so "-usecapabilities" will also work. |
2042 | * |
2043 | * But do so only on invalid label, not on system errors. |
2044 | * The invalid label must be first to count as clearing attempt. |
2045 | */ |
2046 | if (!rc || (rc == -EINVAL && list_empty(head: &list_tmp))) { |
2047 | mutex_lock(&smack_onlycap_lock); |
2048 | smk_list_swap_rcu(public: &smack_onlycap_list, private: &list_tmp); |
2049 | mutex_unlock(lock: &smack_onlycap_lock); |
2050 | rc = count; |
2051 | } |
2052 | |
2053 | smk_destroy_label_list(list: &list_tmp); |
2054 | |
2055 | return rc; |
2056 | } |
2057 | |
2058 | static const struct file_operations smk_onlycap_ops = { |
2059 | .open = smk_open_onlycap, |
2060 | .read = seq_read, |
2061 | .write = smk_write_onlycap, |
2062 | .llseek = seq_lseek, |
2063 | .release = seq_release, |
2064 | }; |
2065 | |
2066 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2067 | /** |
2068 | * smk_read_unconfined - read() for smackfs/unconfined |
2069 | * @filp: file pointer, not actually used |
2070 | * @buf: where to put the result |
2071 | * @cn: maximum to send along |
2072 | * @ppos: where to start |
2073 | * |
2074 | * Returns number of bytes read or error code, as appropriate |
2075 | */ |
2076 | static ssize_t smk_read_unconfined(struct file *filp, char __user *buf, |
2077 | size_t cn, loff_t *ppos) |
2078 | { |
2079 | char *smack = "" ; |
2080 | ssize_t rc = -EINVAL; |
2081 | int asize; |
2082 | |
2083 | if (*ppos != 0) |
2084 | return 0; |
2085 | |
2086 | if (smack_unconfined != NULL) |
2087 | smack = smack_unconfined->smk_known; |
2088 | |
2089 | asize = strlen(smack) + 1; |
2090 | |
2091 | if (cn >= asize) |
2092 | rc = simple_read_from_buffer(to: buf, count: cn, ppos, from: smack, available: asize); |
2093 | |
2094 | return rc; |
2095 | } |
2096 | |
2097 | /** |
2098 | * smk_write_unconfined - write() for smackfs/unconfined |
2099 | * @file: file pointer, not actually used |
2100 | * @buf: where to get the data from |
2101 | * @count: bytes sent |
2102 | * @ppos: where to start |
2103 | * |
2104 | * Returns number of bytes written or error code, as appropriate |
2105 | */ |
2106 | static ssize_t smk_write_unconfined(struct file *file, const char __user *buf, |
2107 | size_t count, loff_t *ppos) |
2108 | { |
2109 | char *data; |
2110 | struct smack_known *skp; |
2111 | int rc = count; |
2112 | |
2113 | if (!smack_privileged(CAP_MAC_ADMIN)) |
2114 | return -EPERM; |
2115 | |
2116 | if (count > PAGE_SIZE) |
2117 | return -EINVAL; |
2118 | |
2119 | data = memdup_user_nul(buf, count); |
2120 | if (IS_ERR(ptr: data)) |
2121 | return PTR_ERR(ptr: data); |
2122 | |
2123 | /* |
2124 | * Clear the smack_unconfined on invalid label errors. This means |
2125 | * that we can pass a null string to unset the unconfined value. |
2126 | * |
2127 | * Importing will also reject a label beginning with '-', |
2128 | * so "-confine" will also work. |
2129 | * |
2130 | * But do so only on invalid label, not on system errors. |
2131 | */ |
2132 | skp = smk_import_entry(data, count); |
2133 | if (PTR_ERR(ptr: skp) == -EINVAL) |
2134 | skp = NULL; |
2135 | else if (IS_ERR(ptr: skp)) { |
2136 | rc = PTR_ERR(ptr: skp); |
2137 | goto freeout; |
2138 | } |
2139 | |
2140 | smack_unconfined = skp; |
2141 | |
2142 | freeout: |
2143 | kfree(objp: data); |
2144 | return rc; |
2145 | } |
2146 | |
2147 | static const struct file_operations smk_unconfined_ops = { |
2148 | .read = smk_read_unconfined, |
2149 | .write = smk_write_unconfined, |
2150 | .llseek = default_llseek, |
2151 | }; |
2152 | #endif /* CONFIG_SECURITY_SMACK_BRINGUP */ |
2153 | |
2154 | /** |
2155 | * smk_read_logging - read() for /smack/logging |
2156 | * @filp: file pointer, not actually used |
2157 | * @buf: where to put the result |
2158 | * @count: maximum to send along |
2159 | * @ppos: where to start |
2160 | * |
2161 | * Returns number of bytes read or error code, as appropriate |
2162 | */ |
2163 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, |
2164 | size_t count, loff_t *ppos) |
2165 | { |
2166 | char temp[32]; |
2167 | ssize_t rc; |
2168 | |
2169 | if (*ppos != 0) |
2170 | return 0; |
2171 | |
2172 | sprintf(buf: temp, fmt: "%d\n" , log_policy); |
2173 | rc = simple_read_from_buffer(to: buf, count, ppos, from: temp, strlen(temp)); |
2174 | return rc; |
2175 | } |
2176 | |
2177 | /** |
2178 | * smk_write_logging - write() for /smack/logging |
2179 | * @file: file pointer, not actually used |
2180 | * @buf: where to get the data from |
2181 | * @count: bytes sent |
2182 | * @ppos: where to start |
2183 | * |
2184 | * Returns number of bytes written or error code, as appropriate |
2185 | */ |
2186 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, |
2187 | size_t count, loff_t *ppos) |
2188 | { |
2189 | char temp[32]; |
2190 | int i; |
2191 | |
2192 | if (!smack_privileged(CAP_MAC_ADMIN)) |
2193 | return -EPERM; |
2194 | |
2195 | if (count >= sizeof(temp) || count == 0) |
2196 | return -EINVAL; |
2197 | |
2198 | if (copy_from_user(to: temp, from: buf, n: count) != 0) |
2199 | return -EFAULT; |
2200 | |
2201 | temp[count] = '\0'; |
2202 | |
2203 | if (sscanf(temp, "%d" , &i) != 1) |
2204 | return -EINVAL; |
2205 | if (i < 0 || i > 3) |
2206 | return -EINVAL; |
2207 | log_policy = i; |
2208 | return count; |
2209 | } |
2210 | |
2211 | |
2212 | |
2213 | static const struct file_operations smk_logging_ops = { |
2214 | .read = smk_read_logging, |
2215 | .write = smk_write_logging, |
2216 | .llseek = default_llseek, |
2217 | }; |
2218 | |
2219 | /* |
2220 | * Seq_file read operations for /smack/load-self |
2221 | */ |
2222 | |
2223 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) |
2224 | { |
2225 | struct task_smack *tsp = smack_cred(current_cred()); |
2226 | |
2227 | return smk_seq_start(s, pos, head: &tsp->smk_rules); |
2228 | } |
2229 | |
2230 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) |
2231 | { |
2232 | struct task_smack *tsp = smack_cred(current_cred()); |
2233 | |
2234 | return smk_seq_next(s, v, pos, head: &tsp->smk_rules); |
2235 | } |
2236 | |
2237 | static int load_self_seq_show(struct seq_file *s, void *v) |
2238 | { |
2239 | struct list_head *list = v; |
2240 | struct smack_rule *srp = |
2241 | list_entry_rcu(list, struct smack_rule, list); |
2242 | |
2243 | smk_rule_show(s, srp, SMK_LABELLEN); |
2244 | |
2245 | return 0; |
2246 | } |
2247 | |
2248 | static const struct seq_operations load_self_seq_ops = { |
2249 | .start = load_self_seq_start, |
2250 | .next = load_self_seq_next, |
2251 | .show = load_self_seq_show, |
2252 | .stop = smk_seq_stop, |
2253 | }; |
2254 | |
2255 | |
2256 | /** |
2257 | * smk_open_load_self - open() for /smack/load-self2 |
2258 | * @inode: inode structure representing file |
2259 | * @file: "load" file pointer |
2260 | * |
2261 | * For reading, use load_seq_* seq_file reading operations. |
2262 | */ |
2263 | static int smk_open_load_self(struct inode *inode, struct file *file) |
2264 | { |
2265 | return seq_open(file, &load_self_seq_ops); |
2266 | } |
2267 | |
2268 | /** |
2269 | * smk_write_load_self - write() for /smack/load-self |
2270 | * @file: file pointer, not actually used |
2271 | * @buf: where to get the data from |
2272 | * @count: bytes sent |
2273 | * @ppos: where to start - must be 0 |
2274 | * |
2275 | */ |
2276 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, |
2277 | size_t count, loff_t *ppos) |
2278 | { |
2279 | struct task_smack *tsp = smack_cred(current_cred()); |
2280 | |
2281 | return smk_write_rules_list(file, buf, count, ppos, rule_list: &tsp->smk_rules, |
2282 | rule_lock: &tsp->smk_rules_lock, SMK_FIXED24_FMT); |
2283 | } |
2284 | |
2285 | static const struct file_operations smk_load_self_ops = { |
2286 | .open = smk_open_load_self, |
2287 | .read = seq_read, |
2288 | .llseek = seq_lseek, |
2289 | .write = smk_write_load_self, |
2290 | .release = seq_release, |
2291 | }; |
2292 | |
2293 | /** |
2294 | * smk_user_access - handle access check transaction |
2295 | * @file: file pointer |
2296 | * @buf: data from user space |
2297 | * @count: bytes sent |
2298 | * @ppos: where to start - must be 0 |
2299 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
2300 | */ |
2301 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
2302 | size_t count, loff_t *ppos, int format) |
2303 | { |
2304 | struct smack_parsed_rule rule; |
2305 | char *data; |
2306 | int res; |
2307 | |
2308 | data = simple_transaction_get(file, buf, size: count); |
2309 | if (IS_ERR(ptr: data)) |
2310 | return PTR_ERR(ptr: data); |
2311 | |
2312 | if (format == SMK_FIXED24_FMT) { |
2313 | if (count < SMK_LOADLEN) |
2314 | return -EINVAL; |
2315 | res = smk_parse_rule(data, rule: &rule, import: 0); |
2316 | } else { |
2317 | /* |
2318 | * simple_transaction_get() returns null-terminated data |
2319 | */ |
2320 | res = smk_parse_long_rule(data, rule: &rule, import: 0, tokens: 3); |
2321 | } |
2322 | |
2323 | if (res >= 0) |
2324 | res = smk_access(rule.smk_subject, rule.smk_object, |
2325 | rule.smk_access1, NULL); |
2326 | else if (res != -ENOENT) |
2327 | return res; |
2328 | |
2329 | /* |
2330 | * smk_access() can return a value > 0 in the "bringup" case. |
2331 | */ |
2332 | data[0] = res >= 0 ? '1' : '0'; |
2333 | data[1] = '\0'; |
2334 | |
2335 | simple_transaction_set(file, n: 2); |
2336 | |
2337 | if (format == SMK_FIXED24_FMT) |
2338 | return SMK_LOADLEN; |
2339 | return count; |
2340 | } |
2341 | |
2342 | /** |
2343 | * smk_write_access - handle access check transaction |
2344 | * @file: file pointer |
2345 | * @buf: data from user space |
2346 | * @count: bytes sent |
2347 | * @ppos: where to start - must be 0 |
2348 | */ |
2349 | static ssize_t smk_write_access(struct file *file, const char __user *buf, |
2350 | size_t count, loff_t *ppos) |
2351 | { |
2352 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); |
2353 | } |
2354 | |
2355 | static const struct file_operations smk_access_ops = { |
2356 | .write = smk_write_access, |
2357 | .read = simple_transaction_read, |
2358 | .release = simple_transaction_release, |
2359 | .llseek = generic_file_llseek, |
2360 | }; |
2361 | |
2362 | |
2363 | /* |
2364 | * Seq_file read operations for /smack/load2 |
2365 | */ |
2366 | |
2367 | static int load2_seq_show(struct seq_file *s, void *v) |
2368 | { |
2369 | struct list_head *list = v; |
2370 | struct smack_rule *srp; |
2371 | struct smack_known *skp = |
2372 | list_entry_rcu(list, struct smack_known, list); |
2373 | |
2374 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) |
2375 | smk_rule_show(s, srp, SMK_LONGLABEL); |
2376 | |
2377 | return 0; |
2378 | } |
2379 | |
2380 | static const struct seq_operations load2_seq_ops = { |
2381 | .start = load2_seq_start, |
2382 | .next = load2_seq_next, |
2383 | .show = load2_seq_show, |
2384 | .stop = smk_seq_stop, |
2385 | }; |
2386 | |
2387 | /** |
2388 | * smk_open_load2 - open() for /smack/load2 |
2389 | * @inode: inode structure representing file |
2390 | * @file: "load2" file pointer |
2391 | * |
2392 | * For reading, use load2_seq_* seq_file reading operations. |
2393 | */ |
2394 | static int smk_open_load2(struct inode *inode, struct file *file) |
2395 | { |
2396 | return seq_open(file, &load2_seq_ops); |
2397 | } |
2398 | |
2399 | /** |
2400 | * smk_write_load2 - write() for /smack/load2 |
2401 | * @file: file pointer, not actually used |
2402 | * @buf: where to get the data from |
2403 | * @count: bytes sent |
2404 | * @ppos: where to start - must be 0 |
2405 | * |
2406 | */ |
2407 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, |
2408 | size_t count, loff_t *ppos) |
2409 | { |
2410 | /* |
2411 | * Must have privilege. |
2412 | */ |
2413 | if (!smack_privileged(CAP_MAC_ADMIN)) |
2414 | return -EPERM; |
2415 | |
2416 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
2417 | SMK_LONG_FMT); |
2418 | } |
2419 | |
2420 | static const struct file_operations smk_load2_ops = { |
2421 | .open = smk_open_load2, |
2422 | .read = seq_read, |
2423 | .llseek = seq_lseek, |
2424 | .write = smk_write_load2, |
2425 | .release = seq_release, |
2426 | }; |
2427 | |
2428 | /* |
2429 | * Seq_file read operations for /smack/load-self2 |
2430 | */ |
2431 | |
2432 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) |
2433 | { |
2434 | struct task_smack *tsp = smack_cred(current_cred()); |
2435 | |
2436 | return smk_seq_start(s, pos, head: &tsp->smk_rules); |
2437 | } |
2438 | |
2439 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) |
2440 | { |
2441 | struct task_smack *tsp = smack_cred(current_cred()); |
2442 | |
2443 | return smk_seq_next(s, v, pos, head: &tsp->smk_rules); |
2444 | } |
2445 | |
2446 | static int load_self2_seq_show(struct seq_file *s, void *v) |
2447 | { |
2448 | struct list_head *list = v; |
2449 | struct smack_rule *srp = |
2450 | list_entry_rcu(list, struct smack_rule, list); |
2451 | |
2452 | smk_rule_show(s, srp, SMK_LONGLABEL); |
2453 | |
2454 | return 0; |
2455 | } |
2456 | |
2457 | static const struct seq_operations load_self2_seq_ops = { |
2458 | .start = load_self2_seq_start, |
2459 | .next = load_self2_seq_next, |
2460 | .show = load_self2_seq_show, |
2461 | .stop = smk_seq_stop, |
2462 | }; |
2463 | |
2464 | /** |
2465 | * smk_open_load_self2 - open() for /smack/load-self2 |
2466 | * @inode: inode structure representing file |
2467 | * @file: "load" file pointer |
2468 | * |
2469 | * For reading, use load_seq_* seq_file reading operations. |
2470 | */ |
2471 | static int smk_open_load_self2(struct inode *inode, struct file *file) |
2472 | { |
2473 | return seq_open(file, &load_self2_seq_ops); |
2474 | } |
2475 | |
2476 | /** |
2477 | * smk_write_load_self2 - write() for /smack/load-self2 |
2478 | * @file: file pointer, not actually used |
2479 | * @buf: where to get the data from |
2480 | * @count: bytes sent |
2481 | * @ppos: where to start - must be 0 |
2482 | * |
2483 | */ |
2484 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, |
2485 | size_t count, loff_t *ppos) |
2486 | { |
2487 | struct task_smack *tsp = smack_cred(current_cred()); |
2488 | |
2489 | return smk_write_rules_list(file, buf, count, ppos, rule_list: &tsp->smk_rules, |
2490 | rule_lock: &tsp->smk_rules_lock, SMK_LONG_FMT); |
2491 | } |
2492 | |
2493 | static const struct file_operations smk_load_self2_ops = { |
2494 | .open = smk_open_load_self2, |
2495 | .read = seq_read, |
2496 | .llseek = seq_lseek, |
2497 | .write = smk_write_load_self2, |
2498 | .release = seq_release, |
2499 | }; |
2500 | |
2501 | /** |
2502 | * smk_write_access2 - handle access check transaction |
2503 | * @file: file pointer |
2504 | * @buf: data from user space |
2505 | * @count: bytes sent |
2506 | * @ppos: where to start - must be 0 |
2507 | */ |
2508 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, |
2509 | size_t count, loff_t *ppos) |
2510 | { |
2511 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); |
2512 | } |
2513 | |
2514 | static const struct file_operations smk_access2_ops = { |
2515 | .write = smk_write_access2, |
2516 | .read = simple_transaction_read, |
2517 | .release = simple_transaction_release, |
2518 | .llseek = generic_file_llseek, |
2519 | }; |
2520 | |
2521 | /** |
2522 | * smk_write_revoke_subj - write() for /smack/revoke-subject |
2523 | * @file: file pointer |
2524 | * @buf: data from user space |
2525 | * @count: bytes sent |
2526 | * @ppos: where to start - must be 0 |
2527 | */ |
2528 | static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, |
2529 | size_t count, loff_t *ppos) |
2530 | { |
2531 | char *data; |
2532 | const char *cp; |
2533 | struct smack_known *skp; |
2534 | struct smack_rule *sp; |
2535 | struct list_head *rule_list; |
2536 | struct mutex *rule_lock; |
2537 | int rc = count; |
2538 | |
2539 | if (*ppos != 0) |
2540 | return -EINVAL; |
2541 | |
2542 | if (!smack_privileged(CAP_MAC_ADMIN)) |
2543 | return -EPERM; |
2544 | |
2545 | if (count == 0 || count > SMK_LONGLABEL) |
2546 | return -EINVAL; |
2547 | |
2548 | data = memdup_user(buf, count); |
2549 | if (IS_ERR(ptr: data)) |
2550 | return PTR_ERR(ptr: data); |
2551 | |
2552 | cp = smk_parse_smack(string: data, len: count); |
2553 | if (IS_ERR(ptr: cp)) { |
2554 | rc = PTR_ERR(ptr: cp); |
2555 | goto out_data; |
2556 | } |
2557 | |
2558 | skp = smk_find_entry(cp); |
2559 | if (skp == NULL) |
2560 | goto out_cp; |
2561 | |
2562 | rule_list = &skp->smk_rules; |
2563 | rule_lock = &skp->smk_rules_lock; |
2564 | |
2565 | mutex_lock(rule_lock); |
2566 | |
2567 | list_for_each_entry_rcu(sp, rule_list, list) |
2568 | sp->smk_access = 0; |
2569 | |
2570 | mutex_unlock(lock: rule_lock); |
2571 | |
2572 | out_cp: |
2573 | kfree(objp: cp); |
2574 | out_data: |
2575 | kfree(objp: data); |
2576 | |
2577 | return rc; |
2578 | } |
2579 | |
2580 | static const struct file_operations smk_revoke_subj_ops = { |
2581 | .write = smk_write_revoke_subj, |
2582 | .read = simple_transaction_read, |
2583 | .release = simple_transaction_release, |
2584 | .llseek = generic_file_llseek, |
2585 | }; |
2586 | |
2587 | /** |
2588 | * smk_init_sysfs - initialize /sys/fs/smackfs |
2589 | * |
2590 | */ |
2591 | static int smk_init_sysfs(void) |
2592 | { |
2593 | return sysfs_create_mount_point(parent_kobj: fs_kobj, name: "smackfs" ); |
2594 | } |
2595 | |
2596 | /** |
2597 | * smk_write_change_rule - write() for /smack/change-rule |
2598 | * @file: file pointer |
2599 | * @buf: data from user space |
2600 | * @count: bytes sent |
2601 | * @ppos: where to start - must be 0 |
2602 | */ |
2603 | static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, |
2604 | size_t count, loff_t *ppos) |
2605 | { |
2606 | /* |
2607 | * Must have privilege. |
2608 | */ |
2609 | if (!smack_privileged(CAP_MAC_ADMIN)) |
2610 | return -EPERM; |
2611 | |
2612 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
2613 | SMK_CHANGE_FMT); |
2614 | } |
2615 | |
2616 | static const struct file_operations smk_change_rule_ops = { |
2617 | .write = smk_write_change_rule, |
2618 | .read = simple_transaction_read, |
2619 | .release = simple_transaction_release, |
2620 | .llseek = generic_file_llseek, |
2621 | }; |
2622 | |
2623 | /** |
2624 | * smk_read_syslog - read() for smackfs/syslog |
2625 | * @filp: file pointer, not actually used |
2626 | * @buf: where to put the result |
2627 | * @cn: maximum to send along |
2628 | * @ppos: where to start |
2629 | * |
2630 | * Returns number of bytes read or error code, as appropriate |
2631 | */ |
2632 | static ssize_t smk_read_syslog(struct file *filp, char __user *buf, |
2633 | size_t cn, loff_t *ppos) |
2634 | { |
2635 | struct smack_known *skp; |
2636 | ssize_t rc = -EINVAL; |
2637 | int asize; |
2638 | |
2639 | if (*ppos != 0) |
2640 | return 0; |
2641 | |
2642 | if (smack_syslog_label == NULL) |
2643 | skp = &smack_known_star; |
2644 | else |
2645 | skp = smack_syslog_label; |
2646 | |
2647 | asize = strlen(skp->smk_known) + 1; |
2648 | |
2649 | if (cn >= asize) |
2650 | rc = simple_read_from_buffer(to: buf, count: cn, ppos, from: skp->smk_known, |
2651 | available: asize); |
2652 | |
2653 | return rc; |
2654 | } |
2655 | |
2656 | /** |
2657 | * smk_write_syslog - write() for smackfs/syslog |
2658 | * @file: file pointer, not actually used |
2659 | * @buf: where to get the data from |
2660 | * @count: bytes sent |
2661 | * @ppos: where to start |
2662 | * |
2663 | * Returns number of bytes written or error code, as appropriate |
2664 | */ |
2665 | static ssize_t smk_write_syslog(struct file *file, const char __user *buf, |
2666 | size_t count, loff_t *ppos) |
2667 | { |
2668 | char *data; |
2669 | struct smack_known *skp; |
2670 | int rc = count; |
2671 | |
2672 | if (!smack_privileged(CAP_MAC_ADMIN)) |
2673 | return -EPERM; |
2674 | |
2675 | /* Enough data must be present */ |
2676 | if (count == 0 || count > PAGE_SIZE) |
2677 | return -EINVAL; |
2678 | |
2679 | data = memdup_user_nul(buf, count); |
2680 | if (IS_ERR(ptr: data)) |
2681 | return PTR_ERR(ptr: data); |
2682 | |
2683 | skp = smk_import_entry(data, count); |
2684 | if (IS_ERR(ptr: skp)) |
2685 | rc = PTR_ERR(ptr: skp); |
2686 | else |
2687 | smack_syslog_label = skp; |
2688 | |
2689 | kfree(objp: data); |
2690 | return rc; |
2691 | } |
2692 | |
2693 | static const struct file_operations smk_syslog_ops = { |
2694 | .read = smk_read_syslog, |
2695 | .write = smk_write_syslog, |
2696 | .llseek = default_llseek, |
2697 | }; |
2698 | |
2699 | /* |
2700 | * Seq_file read operations for /smack/relabel-self |
2701 | */ |
2702 | |
2703 | static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos) |
2704 | { |
2705 | struct task_smack *tsp = smack_cred(current_cred()); |
2706 | |
2707 | return smk_seq_start(s, pos, head: &tsp->smk_relabel); |
2708 | } |
2709 | |
2710 | static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos) |
2711 | { |
2712 | struct task_smack *tsp = smack_cred(current_cred()); |
2713 | |
2714 | return smk_seq_next(s, v, pos, head: &tsp->smk_relabel); |
2715 | } |
2716 | |
2717 | static int relabel_self_seq_show(struct seq_file *s, void *v) |
2718 | { |
2719 | struct list_head *list = v; |
2720 | struct smack_known_list_elem *sklep = |
2721 | list_entry(list, struct smack_known_list_elem, list); |
2722 | |
2723 | seq_puts(m: s, s: sklep->smk_label->smk_known); |
2724 | seq_putc(m: s, c: ' '); |
2725 | |
2726 | return 0; |
2727 | } |
2728 | |
2729 | static const struct seq_operations relabel_self_seq_ops = { |
2730 | .start = relabel_self_seq_start, |
2731 | .next = relabel_self_seq_next, |
2732 | .show = relabel_self_seq_show, |
2733 | .stop = smk_seq_stop, |
2734 | }; |
2735 | |
2736 | /** |
2737 | * smk_open_relabel_self - open() for /smack/relabel-self |
2738 | * @inode: inode structure representing file |
2739 | * @file: "relabel-self" file pointer |
2740 | * |
2741 | * Connect our relabel_self_seq_* operations with /smack/relabel-self |
2742 | * file_operations |
2743 | */ |
2744 | static int smk_open_relabel_self(struct inode *inode, struct file *file) |
2745 | { |
2746 | return seq_open(file, &relabel_self_seq_ops); |
2747 | } |
2748 | |
2749 | /** |
2750 | * smk_write_relabel_self - write() for /smack/relabel-self |
2751 | * @file: file pointer, not actually used |
2752 | * @buf: where to get the data from |
2753 | * @count: bytes sent |
2754 | * @ppos: where to start - must be 0 |
2755 | * |
2756 | */ |
2757 | static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf, |
2758 | size_t count, loff_t *ppos) |
2759 | { |
2760 | char *data; |
2761 | int rc; |
2762 | LIST_HEAD(list_tmp); |
2763 | |
2764 | /* |
2765 | * Must have privilege. |
2766 | */ |
2767 | if (!smack_privileged(CAP_MAC_ADMIN)) |
2768 | return -EPERM; |
2769 | |
2770 | /* |
2771 | * No partial write. |
2772 | * Enough data must be present. |
2773 | */ |
2774 | if (*ppos != 0) |
2775 | return -EINVAL; |
2776 | if (count == 0 || count > PAGE_SIZE) |
2777 | return -EINVAL; |
2778 | |
2779 | data = memdup_user_nul(buf, count); |
2780 | if (IS_ERR(ptr: data)) |
2781 | return PTR_ERR(ptr: data); |
2782 | |
2783 | rc = smk_parse_label_list(data, list: &list_tmp); |
2784 | kfree(objp: data); |
2785 | |
2786 | if (!rc || (rc == -EINVAL && list_empty(head: &list_tmp))) { |
2787 | struct cred *new; |
2788 | struct task_smack *tsp; |
2789 | |
2790 | new = prepare_creds(); |
2791 | if (!new) { |
2792 | rc = -ENOMEM; |
2793 | goto out; |
2794 | } |
2795 | tsp = smack_cred(cred: new); |
2796 | smk_destroy_label_list(list: &tsp->smk_relabel); |
2797 | list_splice(list: &list_tmp, head: &tsp->smk_relabel); |
2798 | commit_creds(new); |
2799 | return count; |
2800 | } |
2801 | out: |
2802 | smk_destroy_label_list(list: &list_tmp); |
2803 | return rc; |
2804 | } |
2805 | |
2806 | static const struct file_operations smk_relabel_self_ops = { |
2807 | .open = smk_open_relabel_self, |
2808 | .read = seq_read, |
2809 | .llseek = seq_lseek, |
2810 | .write = smk_write_relabel_self, |
2811 | .release = seq_release, |
2812 | }; |
2813 | |
2814 | /** |
2815 | * smk_read_ptrace - read() for /smack/ptrace |
2816 | * @filp: file pointer, not actually used |
2817 | * @buf: where to put the result |
2818 | * @count: maximum to send along |
2819 | * @ppos: where to start |
2820 | * |
2821 | * Returns number of bytes read or error code, as appropriate |
2822 | */ |
2823 | static ssize_t smk_read_ptrace(struct file *filp, char __user *buf, |
2824 | size_t count, loff_t *ppos) |
2825 | { |
2826 | char temp[32]; |
2827 | ssize_t rc; |
2828 | |
2829 | if (*ppos != 0) |
2830 | return 0; |
2831 | |
2832 | sprintf(buf: temp, fmt: "%d\n" , smack_ptrace_rule); |
2833 | rc = simple_read_from_buffer(to: buf, count, ppos, from: temp, strlen(temp)); |
2834 | return rc; |
2835 | } |
2836 | |
2837 | /** |
2838 | * smk_write_ptrace - write() for /smack/ptrace |
2839 | * @file: file pointer |
2840 | * @buf: data from user space |
2841 | * @count: bytes sent |
2842 | * @ppos: where to start - must be 0 |
2843 | */ |
2844 | static ssize_t smk_write_ptrace(struct file *file, const char __user *buf, |
2845 | size_t count, loff_t *ppos) |
2846 | { |
2847 | char temp[32]; |
2848 | int i; |
2849 | |
2850 | if (!smack_privileged(CAP_MAC_ADMIN)) |
2851 | return -EPERM; |
2852 | |
2853 | if (*ppos != 0 || count >= sizeof(temp) || count == 0) |
2854 | return -EINVAL; |
2855 | |
2856 | if (copy_from_user(to: temp, from: buf, n: count) != 0) |
2857 | return -EFAULT; |
2858 | |
2859 | temp[count] = '\0'; |
2860 | |
2861 | if (sscanf(temp, "%d" , &i) != 1) |
2862 | return -EINVAL; |
2863 | if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX) |
2864 | return -EINVAL; |
2865 | smack_ptrace_rule = i; |
2866 | |
2867 | return count; |
2868 | } |
2869 | |
2870 | static const struct file_operations smk_ptrace_ops = { |
2871 | .write = smk_write_ptrace, |
2872 | .read = smk_read_ptrace, |
2873 | .llseek = default_llseek, |
2874 | }; |
2875 | |
2876 | /** |
2877 | * smk_fill_super - fill the smackfs superblock |
2878 | * @sb: the empty superblock |
2879 | * @fc: unused |
2880 | * |
2881 | * Fill in the well known entries for the smack filesystem |
2882 | * |
2883 | * Returns 0 on success, an error code on failure |
2884 | */ |
2885 | static int smk_fill_super(struct super_block *sb, struct fs_context *fc) |
2886 | { |
2887 | int rc; |
2888 | |
2889 | static const struct tree_descr smack_files[] = { |
2890 | [SMK_LOAD] = { |
2891 | "load" , &smk_load_ops, S_IRUGO|S_IWUSR}, |
2892 | [SMK_CIPSO] = { |
2893 | .name: "cipso" , .ops: &smk_cipso_ops, S_IRUGO|S_IWUSR}, |
2894 | [SMK_DOI] = { |
2895 | .name: "doi" , .ops: &smk_doi_ops, S_IRUGO|S_IWUSR}, |
2896 | [SMK_DIRECT] = { |
2897 | .name: "direct" , .ops: &smk_direct_ops, S_IRUGO|S_IWUSR}, |
2898 | [SMK_AMBIENT] = { |
2899 | .name: "ambient" , .ops: &smk_ambient_ops, S_IRUGO|S_IWUSR}, |
2900 | [SMK_NET4ADDR] = { |
2901 | .name: "netlabel" , .ops: &smk_net4addr_ops, S_IRUGO|S_IWUSR}, |
2902 | [SMK_ONLYCAP] = { |
2903 | .name: "onlycap" , .ops: &smk_onlycap_ops, S_IRUGO|S_IWUSR}, |
2904 | [SMK_LOGGING] = { |
2905 | .name: "logging" , .ops: &smk_logging_ops, S_IRUGO|S_IWUSR}, |
2906 | [SMK_LOAD_SELF] = { |
2907 | .name: "load-self" , .ops: &smk_load_self_ops, S_IRUGO|S_IWUGO}, |
2908 | [SMK_ACCESSES] = { |
2909 | .name: "access" , .ops: &smk_access_ops, S_IRUGO|S_IWUGO}, |
2910 | [SMK_MAPPED] = { |
2911 | .name: "mapped" , .ops: &smk_mapped_ops, S_IRUGO|S_IWUSR}, |
2912 | [SMK_LOAD2] = { |
2913 | .name: "load2" , .ops: &smk_load2_ops, S_IRUGO|S_IWUSR}, |
2914 | [SMK_LOAD_SELF2] = { |
2915 | .name: "load-self2" , .ops: &smk_load_self2_ops, S_IRUGO|S_IWUGO}, |
2916 | [SMK_ACCESS2] = { |
2917 | .name: "access2" , .ops: &smk_access2_ops, S_IRUGO|S_IWUGO}, |
2918 | [SMK_CIPSO2] = { |
2919 | .name: "cipso2" , .ops: &smk_cipso2_ops, S_IRUGO|S_IWUSR}, |
2920 | [SMK_REVOKE_SUBJ] = { |
2921 | .name: "revoke-subject" , .ops: &smk_revoke_subj_ops, |
2922 | S_IRUGO|S_IWUSR}, |
2923 | [SMK_CHANGE_RULE] = { |
2924 | .name: "change-rule" , .ops: &smk_change_rule_ops, S_IRUGO|S_IWUSR}, |
2925 | [SMK_SYSLOG] = { |
2926 | .name: "syslog" , .ops: &smk_syslog_ops, S_IRUGO|S_IWUSR}, |
2927 | [SMK_PTRACE] = { |
2928 | .name: "ptrace" , .ops: &smk_ptrace_ops, S_IRUGO|S_IWUSR}, |
2929 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
2930 | [SMK_UNCONFINED] = { |
2931 | .name: "unconfined" , .ops: &smk_unconfined_ops, S_IRUGO|S_IWUSR}, |
2932 | #endif |
2933 | #if IS_ENABLED(CONFIG_IPV6) |
2934 | [SMK_NET6ADDR] = { |
2935 | .name: "ipv6host" , .ops: &smk_net6addr_ops, S_IRUGO|S_IWUSR}, |
2936 | #endif /* CONFIG_IPV6 */ |
2937 | [SMK_RELABEL_SELF] = { |
2938 | .name: "relabel-self" , .ops: &smk_relabel_self_ops, |
2939 | S_IRUGO|S_IWUGO}, |
2940 | /* last one */ |
2941 | {"" } |
2942 | }; |
2943 | |
2944 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); |
2945 | if (rc != 0) { |
2946 | printk(KERN_ERR "%s failed %d while creating inodes\n" , |
2947 | __func__, rc); |
2948 | return rc; |
2949 | } |
2950 | |
2951 | return 0; |
2952 | } |
2953 | |
2954 | /** |
2955 | * smk_get_tree - get the smackfs superblock |
2956 | * @fc: The mount context, including any options |
2957 | * |
2958 | * Just passes everything along. |
2959 | * |
2960 | * Returns what the lower level code does. |
2961 | */ |
2962 | static int smk_get_tree(struct fs_context *fc) |
2963 | { |
2964 | return get_tree_single(fc, fill_super: smk_fill_super); |
2965 | } |
2966 | |
2967 | static const struct fs_context_operations smk_context_ops = { |
2968 | .get_tree = smk_get_tree, |
2969 | }; |
2970 | |
2971 | /** |
2972 | * smk_init_fs_context - Initialise a filesystem context for smackfs |
2973 | * @fc: The blank mount context |
2974 | */ |
2975 | static int smk_init_fs_context(struct fs_context *fc) |
2976 | { |
2977 | fc->ops = &smk_context_ops; |
2978 | return 0; |
2979 | } |
2980 | |
2981 | static struct file_system_type smk_fs_type = { |
2982 | .name = "smackfs" , |
2983 | .init_fs_context = smk_init_fs_context, |
2984 | .kill_sb = kill_litter_super, |
2985 | }; |
2986 | |
2987 | static struct vfsmount *smackfs_mount; |
2988 | |
2989 | /** |
2990 | * init_smk_fs - get the smackfs superblock |
2991 | * |
2992 | * register the smackfs |
2993 | * |
2994 | * Do not register smackfs if Smack wasn't enabled |
2995 | * on boot. We can not put this method normally under the |
2996 | * smack_init() code path since the security subsystem get |
2997 | * initialized before the vfs caches. |
2998 | * |
2999 | * Returns true if we were not chosen on boot or if |
3000 | * we were chosen and filesystem registration succeeded. |
3001 | */ |
3002 | static int __init init_smk_fs(void) |
3003 | { |
3004 | int err; |
3005 | int rc; |
3006 | |
3007 | if (smack_enabled == 0) |
3008 | return 0; |
3009 | |
3010 | err = smk_init_sysfs(); |
3011 | if (err) |
3012 | printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n" ); |
3013 | |
3014 | err = register_filesystem(&smk_fs_type); |
3015 | if (!err) { |
3016 | smackfs_mount = kern_mount(&smk_fs_type); |
3017 | if (IS_ERR(ptr: smackfs_mount)) { |
3018 | printk(KERN_ERR "smackfs: could not mount!\n" ); |
3019 | err = PTR_ERR(ptr: smackfs_mount); |
3020 | smackfs_mount = NULL; |
3021 | } |
3022 | } |
3023 | |
3024 | smk_cipso_doi(); |
3025 | smk_unlbl_ambient(NULL); |
3026 | |
3027 | rc = smack_populate_secattr(skp: &smack_known_floor); |
3028 | if (err == 0 && rc < 0) |
3029 | err = rc; |
3030 | rc = smack_populate_secattr(skp: &smack_known_hat); |
3031 | if (err == 0 && rc < 0) |
3032 | err = rc; |
3033 | rc = smack_populate_secattr(skp: &smack_known_huh); |
3034 | if (err == 0 && rc < 0) |
3035 | err = rc; |
3036 | rc = smack_populate_secattr(skp: &smack_known_star); |
3037 | if (err == 0 && rc < 0) |
3038 | err = rc; |
3039 | rc = smack_populate_secattr(skp: &smack_known_web); |
3040 | if (err == 0 && rc < 0) |
3041 | err = rc; |
3042 | |
3043 | return err; |
3044 | } |
3045 | |
3046 | __initcall(init_smk_fs); |
3047 | |