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Commit | Line | Data |
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1 | /* | |
2 | * security/tomoyo/util.c | |
3 | * | |
4 | * Utility functions for TOMOYO. | |
5 | * | |
6 | * Copyright (C) 2005-2010 NTT DATA CORPORATION | |
7 | */ | |
8 | ||
9 | #include <linux/slab.h> | |
10 | #include "common.h" | |
11 | ||
12 | /* Lock for protecting policy. */ | |
13 | DEFINE_MUTEX(tomoyo_policy_lock); | |
14 | ||
15 | /* Has /sbin/init started? */ | |
16 | bool tomoyo_policy_loaded; | |
17 | ||
18 | /** | |
19 | * tomoyo_parse_ulong - Parse an "unsigned long" value. | |
20 | * | |
21 | * @result: Pointer to "unsigned long". | |
22 | * @str: Pointer to string to parse. | |
23 | * | |
24 | * Returns value type on success, 0 otherwise. | |
25 | * | |
26 | * The @src is updated to point the first character after the value | |
27 | * on success. | |
28 | */ | |
29 | u8 tomoyo_parse_ulong(unsigned long *result, char **str) | |
30 | { | |
31 | const char *cp = *str; | |
32 | char *ep; | |
33 | int base = 10; | |
34 | if (*cp == '0') { | |
35 | char c = *(cp + 1); | |
36 | if (c == 'x' || c == 'X') { | |
37 | base = 16; | |
38 | cp += 2; | |
39 | } else if (c >= '0' && c <= '7') { | |
40 | base = 8; | |
41 | cp++; | |
42 | } | |
43 | } | |
44 | *result = simple_strtoul(cp, &ep, base); | |
45 | if (cp == ep) | |
46 | return 0; | |
47 | *str = ep; | |
48 | switch (base) { | |
49 | case 16: | |
50 | return TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
51 | case 8: | |
52 | return TOMOYO_VALUE_TYPE_OCTAL; | |
53 | default: | |
54 | return TOMOYO_VALUE_TYPE_DECIMAL; | |
55 | } | |
56 | } | |
57 | ||
58 | /** | |
59 | * tomoyo_print_ulong - Print an "unsigned long" value. | |
60 | * | |
61 | * @buffer: Pointer to buffer. | |
62 | * @buffer_len: Size of @buffer. | |
63 | * @value: An "unsigned long" value. | |
64 | * @type: Type of @value. | |
65 | * | |
66 | * Returns nothing. | |
67 | */ | |
68 | void tomoyo_print_ulong(char *buffer, const int buffer_len, | |
69 | const unsigned long value, const u8 type) | |
70 | { | |
71 | if (type == TOMOYO_VALUE_TYPE_DECIMAL) | |
72 | snprintf(buffer, buffer_len, "%lu", value); | |
73 | else if (type == TOMOYO_VALUE_TYPE_OCTAL) | |
74 | snprintf(buffer, buffer_len, "0%lo", value); | |
75 | else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL) | |
76 | snprintf(buffer, buffer_len, "0x%lX", value); | |
77 | else | |
78 | snprintf(buffer, buffer_len, "type(%u)", type); | |
79 | } | |
80 | ||
81 | /** | |
82 | * tomoyo_parse_name_union - Parse a tomoyo_name_union. | |
83 | * | |
84 | * @filename: Name or name group. | |
85 | * @ptr: Pointer to "struct tomoyo_name_union". | |
86 | * | |
87 | * Returns true on success, false otherwise. | |
88 | */ | |
89 | bool tomoyo_parse_name_union(const char *filename, | |
90 | struct tomoyo_name_union *ptr) | |
91 | { | |
92 | if (!tomoyo_correct_word(filename)) | |
93 | return false; | |
94 | if (filename[0] == '@') { | |
95 | ptr->group = tomoyo_get_group(filename + 1, TOMOYO_PATH_GROUP); | |
96 | ptr->is_group = true; | |
97 | return ptr->group != NULL; | |
98 | } | |
99 | ptr->filename = tomoyo_get_name(filename); | |
100 | ptr->is_group = false; | |
101 | return ptr->filename != NULL; | |
102 | } | |
103 | ||
104 | /** | |
105 | * tomoyo_parse_number_union - Parse a tomoyo_number_union. | |
106 | * | |
107 | * @data: Number or number range or number group. | |
108 | * @ptr: Pointer to "struct tomoyo_number_union". | |
109 | * | |
110 | * Returns true on success, false otherwise. | |
111 | */ | |
112 | bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num) | |
113 | { | |
114 | u8 type; | |
115 | unsigned long v; | |
116 | memset(num, 0, sizeof(*num)); | |
117 | if (data[0] == '@') { | |
118 | if (!tomoyo_correct_word(data)) | |
119 | return false; | |
120 | num->group = tomoyo_get_group(data + 1, TOMOYO_NUMBER_GROUP); | |
121 | num->is_group = true; | |
122 | return num->group != NULL; | |
123 | } | |
124 | type = tomoyo_parse_ulong(&v, &data); | |
125 | if (!type) | |
126 | return false; | |
127 | num->values[0] = v; | |
128 | num->min_type = type; | |
129 | if (!*data) { | |
130 | num->values[1] = v; | |
131 | num->max_type = type; | |
132 | return true; | |
133 | } | |
134 | if (*data++ != '-') | |
135 | return false; | |
136 | type = tomoyo_parse_ulong(&v, &data); | |
137 | if (!type || *data) | |
138 | return false; | |
139 | num->values[1] = v; | |
140 | num->max_type = type; | |
141 | return true; | |
142 | } | |
143 | ||
144 | /** | |
145 | * tomoyo_byte_range - Check whether the string is a \ooo style octal value. | |
146 | * | |
147 | * @str: Pointer to the string. | |
148 | * | |
149 | * Returns true if @str is a \ooo style octal value, false otherwise. | |
150 | * | |
151 | * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF. | |
152 | * This function verifies that \ooo is in valid range. | |
153 | */ | |
154 | static inline bool tomoyo_byte_range(const char *str) | |
155 | { | |
156 | return *str >= '0' && *str++ <= '3' && | |
157 | *str >= '0' && *str++ <= '7' && | |
158 | *str >= '0' && *str <= '7'; | |
159 | } | |
160 | ||
161 | /** | |
162 | * tomoyo_alphabet_char - Check whether the character is an alphabet. | |
163 | * | |
164 | * @c: The character to check. | |
165 | * | |
166 | * Returns true if @c is an alphabet character, false otherwise. | |
167 | */ | |
168 | static inline bool tomoyo_alphabet_char(const char c) | |
169 | { | |
170 | return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'); | |
171 | } | |
172 | ||
173 | /** | |
174 | * tomoyo_make_byte - Make byte value from three octal characters. | |
175 | * | |
176 | * @c1: The first character. | |
177 | * @c2: The second character. | |
178 | * @c3: The third character. | |
179 | * | |
180 | * Returns byte value. | |
181 | */ | |
182 | static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3) | |
183 | { | |
184 | return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0'); | |
185 | } | |
186 | ||
187 | /** | |
188 | * tomoyo_str_starts - Check whether the given string starts with the given keyword. | |
189 | * | |
190 | * @src: Pointer to pointer to the string. | |
191 | * @find: Pointer to the keyword. | |
192 | * | |
193 | * Returns true if @src starts with @find, false otherwise. | |
194 | * | |
195 | * The @src is updated to point the first character after the @find | |
196 | * if @src starts with @find. | |
197 | */ | |
198 | bool tomoyo_str_starts(char **src, const char *find) | |
199 | { | |
200 | const int len = strlen(find); | |
201 | char *tmp = *src; | |
202 | ||
203 | if (strncmp(tmp, find, len)) | |
204 | return false; | |
205 | tmp += len; | |
206 | *src = tmp; | |
207 | return true; | |
208 | } | |
209 | ||
210 | /** | |
211 | * tomoyo_normalize_line - Format string. | |
212 | * | |
213 | * @buffer: The line to normalize. | |
214 | * | |
215 | * Leading and trailing whitespaces are removed. | |
216 | * Multiple whitespaces are packed into single space. | |
217 | * | |
218 | * Returns nothing. | |
219 | */ | |
220 | void tomoyo_normalize_line(unsigned char *buffer) | |
221 | { | |
222 | unsigned char *sp = buffer; | |
223 | unsigned char *dp = buffer; | |
224 | bool first = true; | |
225 | ||
226 | while (tomoyo_invalid(*sp)) | |
227 | sp++; | |
228 | while (*sp) { | |
229 | if (!first) | |
230 | *dp++ = ' '; | |
231 | first = false; | |
232 | while (tomoyo_valid(*sp)) | |
233 | *dp++ = *sp++; | |
234 | while (tomoyo_invalid(*sp)) | |
235 | sp++; | |
236 | } | |
237 | *dp = '\0'; | |
238 | } | |
239 | ||
240 | /** | |
241 | * tomoyo_tokenize - Tokenize string. | |
242 | * | |
243 | * @buffer: The line to tokenize. | |
244 | * @w: Pointer to "char *". | |
245 | * @size: Sizeof @w . | |
246 | * | |
247 | * Returns true on success, false otherwise. | |
248 | */ | |
249 | bool tomoyo_tokenize(char *buffer, char *w[], size_t size) | |
250 | { | |
251 | int count = size / sizeof(char *); | |
252 | int i; | |
253 | for (i = 0; i < count; i++) | |
254 | w[i] = ""; | |
255 | for (i = 0; i < count; i++) { | |
256 | char *cp = strchr(buffer, ' '); | |
257 | if (cp) | |
258 | *cp = '\0'; | |
259 | w[i] = buffer; | |
260 | if (!cp) | |
261 | break; | |
262 | buffer = cp + 1; | |
263 | } | |
264 | return i < count || !*buffer; | |
265 | } | |
266 | ||
267 | /** | |
268 | * tomoyo_correct_word2 - Validate a string. | |
269 | * | |
270 | * @string: The string to check. May be non-'\0'-terminated. | |
271 | * @len: Length of @string. | |
272 | * | |
273 | * Check whether the given string follows the naming rules. | |
274 | * Returns true if @string follows the naming rules, false otherwise. | |
275 | */ | |
276 | static bool tomoyo_correct_word2(const char *string, size_t len) | |
277 | { | |
278 | const char *const start = string; | |
279 | bool in_repetition = false; | |
280 | unsigned char c; | |
281 | unsigned char d; | |
282 | unsigned char e; | |
283 | if (!len) | |
284 | goto out; | |
285 | while (len--) { | |
286 | c = *string++; | |
287 | if (c == '\\') { | |
288 | if (!len--) | |
289 | goto out; | |
290 | c = *string++; | |
291 | switch (c) { | |
292 | case '\\': /* "\\" */ | |
293 | continue; | |
294 | case '$': /* "\$" */ | |
295 | case '+': /* "\+" */ | |
296 | case '?': /* "\?" */ | |
297 | case '*': /* "\*" */ | |
298 | case '@': /* "\@" */ | |
299 | case 'x': /* "\x" */ | |
300 | case 'X': /* "\X" */ | |
301 | case 'a': /* "\a" */ | |
302 | case 'A': /* "\A" */ | |
303 | case '-': /* "\-" */ | |
304 | continue; | |
305 | case '{': /* "/\{" */ | |
306 | if (string - 3 < start || *(string - 3) != '/') | |
307 | break; | |
308 | in_repetition = true; | |
309 | continue; | |
310 | case '}': /* "\}/" */ | |
311 | if (*string != '/') | |
312 | break; | |
313 | if (!in_repetition) | |
314 | break; | |
315 | in_repetition = false; | |
316 | continue; | |
317 | case '0': /* "\ooo" */ | |
318 | case '1': | |
319 | case '2': | |
320 | case '3': | |
321 | if (!len-- || !len--) | |
322 | break; | |
323 | d = *string++; | |
324 | e = *string++; | |
325 | if (d < '0' || d > '7' || e < '0' || e > '7') | |
326 | break; | |
327 | c = tomoyo_make_byte(c, d, e); | |
328 | if (tomoyo_invalid(c)) | |
329 | continue; /* pattern is not \000 */ | |
330 | } | |
331 | goto out; | |
332 | } else if (in_repetition && c == '/') { | |
333 | goto out; | |
334 | } else if (tomoyo_invalid(c)) { | |
335 | goto out; | |
336 | } | |
337 | } | |
338 | if (in_repetition) | |
339 | goto out; | |
340 | return true; | |
341 | out: | |
342 | return false; | |
343 | } | |
344 | ||
345 | /** | |
346 | * tomoyo_correct_word - Validate a string. | |
347 | * | |
348 | * @string: The string to check. | |
349 | * | |
350 | * Check whether the given string follows the naming rules. | |
351 | * Returns true if @string follows the naming rules, false otherwise. | |
352 | */ | |
353 | bool tomoyo_correct_word(const char *string) | |
354 | { | |
355 | return tomoyo_correct_word2(string, strlen(string)); | |
356 | } | |
357 | ||
358 | /** | |
359 | * tomoyo_correct_path - Validate a pathname. | |
360 | * | |
361 | * @filename: The pathname to check. | |
362 | * | |
363 | * Check whether the given pathname follows the naming rules. | |
364 | * Returns true if @filename follows the naming rules, false otherwise. | |
365 | */ | |
366 | bool tomoyo_correct_path(const char *filename) | |
367 | { | |
368 | return *filename == '/' && tomoyo_correct_word(filename); | |
369 | } | |
370 | ||
371 | /** | |
372 | * tomoyo_correct_domain - Check whether the given domainname follows the naming rules. | |
373 | * | |
374 | * @domainname: The domainname to check. | |
375 | * | |
376 | * Returns true if @domainname follows the naming rules, false otherwise. | |
377 | */ | |
378 | bool tomoyo_correct_domain(const unsigned char *domainname) | |
379 | { | |
380 | if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME, | |
381 | TOMOYO_ROOT_NAME_LEN)) | |
382 | goto out; | |
383 | domainname += TOMOYO_ROOT_NAME_LEN; | |
384 | if (!*domainname) | |
385 | return true; | |
386 | if (*domainname++ != ' ') | |
387 | goto out; | |
388 | while (1) { | |
389 | const unsigned char *cp = strchr(domainname, ' '); | |
390 | if (!cp) | |
391 | break; | |
392 | if (*domainname != '/' || | |
393 | !tomoyo_correct_word2(domainname, cp - domainname - 1)) | |
394 | goto out; | |
395 | domainname = cp + 1; | |
396 | } | |
397 | return tomoyo_correct_path(domainname); | |
398 | out: | |
399 | return false; | |
400 | } | |
401 | ||
402 | /** | |
403 | * tomoyo_domain_def - Check whether the given token can be a domainname. | |
404 | * | |
405 | * @buffer: The token to check. | |
406 | * | |
407 | * Returns true if @buffer possibly be a domainname, false otherwise. | |
408 | */ | |
409 | bool tomoyo_domain_def(const unsigned char *buffer) | |
410 | { | |
411 | return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN); | |
412 | } | |
413 | ||
414 | /** | |
415 | * tomoyo_find_domain - Find a domain by the given name. | |
416 | * | |
417 | * @domainname: The domainname to find. | |
418 | * | |
419 | * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise. | |
420 | * | |
421 | * Caller holds tomoyo_read_lock(). | |
422 | */ | |
423 | struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname) | |
424 | { | |
425 | struct tomoyo_domain_info *domain; | |
426 | struct tomoyo_path_info name; | |
427 | ||
428 | name.name = domainname; | |
429 | tomoyo_fill_path_info(&name); | |
430 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { | |
431 | if (!domain->is_deleted && | |
432 | !tomoyo_pathcmp(&name, domain->domainname)) | |
433 | return domain; | |
434 | } | |
435 | return NULL; | |
436 | } | |
437 | ||
438 | /** | |
439 | * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token. | |
440 | * | |
441 | * @filename: The string to evaluate. | |
442 | * | |
443 | * Returns the initial length without a pattern in @filename. | |
444 | */ | |
445 | static int tomoyo_const_part_length(const char *filename) | |
446 | { | |
447 | char c; | |
448 | int len = 0; | |
449 | ||
450 | if (!filename) | |
451 | return 0; | |
452 | while ((c = *filename++) != '\0') { | |
453 | if (c != '\\') { | |
454 | len++; | |
455 | continue; | |
456 | } | |
457 | c = *filename++; | |
458 | switch (c) { | |
459 | case '\\': /* "\\" */ | |
460 | len += 2; | |
461 | continue; | |
462 | case '0': /* "\ooo" */ | |
463 | case '1': | |
464 | case '2': | |
465 | case '3': | |
466 | c = *filename++; | |
467 | if (c < '0' || c > '7') | |
468 | break; | |
469 | c = *filename++; | |
470 | if (c < '0' || c > '7') | |
471 | break; | |
472 | len += 4; | |
473 | continue; | |
474 | } | |
475 | break; | |
476 | } | |
477 | return len; | |
478 | } | |
479 | ||
480 | /** | |
481 | * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members. | |
482 | * | |
483 | * @ptr: Pointer to "struct tomoyo_path_info" to fill in. | |
484 | * | |
485 | * The caller sets "struct tomoyo_path_info"->name. | |
486 | */ | |
487 | void tomoyo_fill_path_info(struct tomoyo_path_info *ptr) | |
488 | { | |
489 | const char *name = ptr->name; | |
490 | const int len = strlen(name); | |
491 | ||
492 | ptr->const_len = tomoyo_const_part_length(name); | |
493 | ptr->is_dir = len && (name[len - 1] == '/'); | |
494 | ptr->is_patterned = (ptr->const_len < len); | |
495 | ptr->hash = full_name_hash(name, len); | |
496 | } | |
497 | ||
498 | /** | |
499 | * tomoyo_file_matches_pattern2 - Pattern matching without '/' character and "\-" pattern. | |
500 | * | |
501 | * @filename: The start of string to check. | |
502 | * @filename_end: The end of string to check. | |
503 | * @pattern: The start of pattern to compare. | |
504 | * @pattern_end: The end of pattern to compare. | |
505 | * | |
506 | * Returns true if @filename matches @pattern, false otherwise. | |
507 | */ | |
508 | static bool tomoyo_file_matches_pattern2(const char *filename, | |
509 | const char *filename_end, | |
510 | const char *pattern, | |
511 | const char *pattern_end) | |
512 | { | |
513 | while (filename < filename_end && pattern < pattern_end) { | |
514 | char c; | |
515 | if (*pattern != '\\') { | |
516 | if (*filename++ != *pattern++) | |
517 | return false; | |
518 | continue; | |
519 | } | |
520 | c = *filename; | |
521 | pattern++; | |
522 | switch (*pattern) { | |
523 | int i; | |
524 | int j; | |
525 | case '?': | |
526 | if (c == '/') { | |
527 | return false; | |
528 | } else if (c == '\\') { | |
529 | if (filename[1] == '\\') | |
530 | filename++; | |
531 | else if (tomoyo_byte_range(filename + 1)) | |
532 | filename += 3; | |
533 | else | |
534 | return false; | |
535 | } | |
536 | break; | |
537 | case '\\': | |
538 | if (c != '\\') | |
539 | return false; | |
540 | if (*++filename != '\\') | |
541 | return false; | |
542 | break; | |
543 | case '+': | |
544 | if (!isdigit(c)) | |
545 | return false; | |
546 | break; | |
547 | case 'x': | |
548 | if (!isxdigit(c)) | |
549 | return false; | |
550 | break; | |
551 | case 'a': | |
552 | if (!tomoyo_alphabet_char(c)) | |
553 | return false; | |
554 | break; | |
555 | case '0': | |
556 | case '1': | |
557 | case '2': | |
558 | case '3': | |
559 | if (c == '\\' && tomoyo_byte_range(filename + 1) | |
560 | && strncmp(filename + 1, pattern, 3) == 0) { | |
561 | filename += 3; | |
562 | pattern += 2; | |
563 | break; | |
564 | } | |
565 | return false; /* Not matched. */ | |
566 | case '*': | |
567 | case '@': | |
568 | for (i = 0; i <= filename_end - filename; i++) { | |
569 | if (tomoyo_file_matches_pattern2( | |
570 | filename + i, filename_end, | |
571 | pattern + 1, pattern_end)) | |
572 | return true; | |
573 | c = filename[i]; | |
574 | if (c == '.' && *pattern == '@') | |
575 | break; | |
576 | if (c != '\\') | |
577 | continue; | |
578 | if (filename[i + 1] == '\\') | |
579 | i++; | |
580 | else if (tomoyo_byte_range(filename + i + 1)) | |
581 | i += 3; | |
582 | else | |
583 | break; /* Bad pattern. */ | |
584 | } | |
585 | return false; /* Not matched. */ | |
586 | default: | |
587 | j = 0; | |
588 | c = *pattern; | |
589 | if (c == '$') { | |
590 | while (isdigit(filename[j])) | |
591 | j++; | |
592 | } else if (c == 'X') { | |
593 | while (isxdigit(filename[j])) | |
594 | j++; | |
595 | } else if (c == 'A') { | |
596 | while (tomoyo_alphabet_char(filename[j])) | |
597 | j++; | |
598 | } | |
599 | for (i = 1; i <= j; i++) { | |
600 | if (tomoyo_file_matches_pattern2( | |
601 | filename + i, filename_end, | |
602 | pattern + 1, pattern_end)) | |
603 | return true; | |
604 | } | |
605 | return false; /* Not matched or bad pattern. */ | |
606 | } | |
607 | filename++; | |
608 | pattern++; | |
609 | } | |
610 | while (*pattern == '\\' && | |
611 | (*(pattern + 1) == '*' || *(pattern + 1) == '@')) | |
612 | pattern += 2; | |
613 | return filename == filename_end && pattern == pattern_end; | |
614 | } | |
615 | ||
616 | /** | |
617 | * tomoyo_file_matches_pattern - Pattern matching without '/' character. | |
618 | * | |
619 | * @filename: The start of string to check. | |
620 | * @filename_end: The end of string to check. | |
621 | * @pattern: The start of pattern to compare. | |
622 | * @pattern_end: The end of pattern to compare. | |
623 | * | |
624 | * Returns true if @filename matches @pattern, false otherwise. | |
625 | */ | |
626 | static bool tomoyo_file_matches_pattern(const char *filename, | |
627 | const char *filename_end, | |
628 | const char *pattern, | |
629 | const char *pattern_end) | |
630 | { | |
631 | const char *pattern_start = pattern; | |
632 | bool first = true; | |
633 | bool result; | |
634 | ||
635 | while (pattern < pattern_end - 1) { | |
636 | /* Split at "\-" pattern. */ | |
637 | if (*pattern++ != '\\' || *pattern++ != '-') | |
638 | continue; | |
639 | result = tomoyo_file_matches_pattern2(filename, | |
640 | filename_end, | |
641 | pattern_start, | |
642 | pattern - 2); | |
643 | if (first) | |
644 | result = !result; | |
645 | if (result) | |
646 | return false; | |
647 | first = false; | |
648 | pattern_start = pattern; | |
649 | } | |
650 | result = tomoyo_file_matches_pattern2(filename, filename_end, | |
651 | pattern_start, pattern_end); | |
652 | return first ? result : !result; | |
653 | } | |
654 | ||
655 | /** | |
656 | * tomoyo_path_matches_pattern2 - Do pathname pattern matching. | |
657 | * | |
658 | * @f: The start of string to check. | |
659 | * @p: The start of pattern to compare. | |
660 | * | |
661 | * Returns true if @f matches @p, false otherwise. | |
662 | */ | |
663 | static bool tomoyo_path_matches_pattern2(const char *f, const char *p) | |
664 | { | |
665 | const char *f_delimiter; | |
666 | const char *p_delimiter; | |
667 | ||
668 | while (*f && *p) { | |
669 | f_delimiter = strchr(f, '/'); | |
670 | if (!f_delimiter) | |
671 | f_delimiter = f + strlen(f); | |
672 | p_delimiter = strchr(p, '/'); | |
673 | if (!p_delimiter) | |
674 | p_delimiter = p + strlen(p); | |
675 | if (*p == '\\' && *(p + 1) == '{') | |
676 | goto recursive; | |
677 | if (!tomoyo_file_matches_pattern(f, f_delimiter, p, | |
678 | p_delimiter)) | |
679 | return false; | |
680 | f = f_delimiter; | |
681 | if (*f) | |
682 | f++; | |
683 | p = p_delimiter; | |
684 | if (*p) | |
685 | p++; | |
686 | } | |
687 | /* Ignore trailing "\*" and "\@" in @pattern. */ | |
688 | while (*p == '\\' && | |
689 | (*(p + 1) == '*' || *(p + 1) == '@')) | |
690 | p += 2; | |
691 | return !*f && !*p; | |
692 | recursive: | |
693 | /* | |
694 | * The "\{" pattern is permitted only after '/' character. | |
695 | * This guarantees that below "*(p - 1)" is safe. | |
696 | * Also, the "\}" pattern is permitted only before '/' character | |
697 | * so that "\{" + "\}" pair will not break the "\-" operator. | |
698 | */ | |
699 | if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' || | |
700 | *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\') | |
701 | return false; /* Bad pattern. */ | |
702 | do { | |
703 | /* Compare current component with pattern. */ | |
704 | if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2, | |
705 | p_delimiter - 2)) | |
706 | break; | |
707 | /* Proceed to next component. */ | |
708 | f = f_delimiter; | |
709 | if (!*f) | |
710 | break; | |
711 | f++; | |
712 | /* Continue comparison. */ | |
713 | if (tomoyo_path_matches_pattern2(f, p_delimiter + 1)) | |
714 | return true; | |
715 | f_delimiter = strchr(f, '/'); | |
716 | } while (f_delimiter); | |
717 | return false; /* Not matched. */ | |
718 | } | |
719 | ||
720 | /** | |
721 | * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern. | |
722 | * | |
723 | * @filename: The filename to check. | |
724 | * @pattern: The pattern to compare. | |
725 | * | |
726 | * Returns true if matches, false otherwise. | |
727 | * | |
728 | * The following patterns are available. | |
729 | * \\ \ itself. | |
730 | * \ooo Octal representation of a byte. | |
731 | * \* Zero or more repetitions of characters other than '/'. | |
732 | * \@ Zero or more repetitions of characters other than '/' or '.'. | |
733 | * \? 1 byte character other than '/'. | |
734 | * \$ One or more repetitions of decimal digits. | |
735 | * \+ 1 decimal digit. | |
736 | * \X One or more repetitions of hexadecimal digits. | |
737 | * \x 1 hexadecimal digit. | |
738 | * \A One or more repetitions of alphabet characters. | |
739 | * \a 1 alphabet character. | |
740 | * | |
741 | * \- Subtraction operator. | |
742 | * | |
743 | * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/ | |
744 | * /dir/dir/dir/ ). | |
745 | */ | |
746 | bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename, | |
747 | const struct tomoyo_path_info *pattern) | |
748 | { | |
749 | const char *f = filename->name; | |
750 | const char *p = pattern->name; | |
751 | const int len = pattern->const_len; | |
752 | ||
753 | /* If @pattern doesn't contain pattern, I can use strcmp(). */ | |
754 | if (!pattern->is_patterned) | |
755 | return !tomoyo_pathcmp(filename, pattern); | |
756 | /* Don't compare directory and non-directory. */ | |
757 | if (filename->is_dir != pattern->is_dir) | |
758 | return false; | |
759 | /* Compare the initial length without patterns. */ | |
760 | if (strncmp(f, p, len)) | |
761 | return false; | |
762 | f += len; | |
763 | p += len; | |
764 | return tomoyo_path_matches_pattern2(f, p); | |
765 | } | |
766 | ||
767 | /** | |
768 | * tomoyo_get_exe - Get tomoyo_realpath() of current process. | |
769 | * | |
770 | * Returns the tomoyo_realpath() of current process on success, NULL otherwise. | |
771 | * | |
772 | * This function uses kzalloc(), so the caller must call kfree() | |
773 | * if this function didn't return NULL. | |
774 | */ | |
775 | const char *tomoyo_get_exe(void) | |
776 | { | |
777 | struct mm_struct *mm = current->mm; | |
778 | struct vm_area_struct *vma; | |
779 | const char *cp = NULL; | |
780 | ||
781 | if (!mm) | |
782 | return NULL; | |
783 | down_read(&mm->mmap_sem); | |
784 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
785 | if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) { | |
786 | cp = tomoyo_realpath_from_path(&vma->vm_file->f_path); | |
787 | break; | |
788 | } | |
789 | } | |
790 | up_read(&mm->mmap_sem); | |
791 | return cp; | |
792 | } | |
793 | ||
794 | /** | |
795 | * tomoyo_get_mode - Get MAC mode. | |
796 | * | |
797 | * @profile: Profile number. | |
798 | * @index: Index number of functionality. | |
799 | * | |
800 | * Returns mode. | |
801 | */ | |
802 | int tomoyo_get_mode(const u8 profile, const u8 index) | |
803 | { | |
804 | u8 mode; | |
805 | const u8 category = TOMOYO_MAC_CATEGORY_FILE; | |
806 | if (!tomoyo_policy_loaded) | |
807 | return TOMOYO_CONFIG_DISABLED; | |
808 | mode = tomoyo_profile(profile)->config[index]; | |
809 | if (mode == TOMOYO_CONFIG_USE_DEFAULT) | |
810 | mode = tomoyo_profile(profile)->config[category]; | |
811 | if (mode == TOMOYO_CONFIG_USE_DEFAULT) | |
812 | mode = tomoyo_profile(profile)->default_config; | |
813 | return mode & 3; | |
814 | } | |
815 | ||
816 | /** | |
817 | * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members. | |
818 | * | |
819 | * @r: Pointer to "struct tomoyo_request_info" to initialize. | |
820 | * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain(). | |
821 | * @index: Index number of functionality. | |
822 | * | |
823 | * Returns mode. | |
824 | */ | |
825 | int tomoyo_init_request_info(struct tomoyo_request_info *r, | |
826 | struct tomoyo_domain_info *domain, const u8 index) | |
827 | { | |
828 | u8 profile; | |
829 | memset(r, 0, sizeof(*r)); | |
830 | if (!domain) | |
831 | domain = tomoyo_domain(); | |
832 | r->domain = domain; | |
833 | profile = domain->profile; | |
834 | r->profile = profile; | |
835 | r->type = index; | |
836 | r->mode = tomoyo_get_mode(profile, index); | |
837 | return r->mode; | |
838 | } | |
839 | ||
840 | /** | |
841 | * tomoyo_last_word - Get last component of a line. | |
842 | * | |
843 | * @line: A line. | |
844 | * | |
845 | * Returns the last word of a line. | |
846 | */ | |
847 | const char *tomoyo_last_word(const char *name) | |
848 | { | |
849 | const char *cp = strrchr(name, ' '); | |
850 | if (cp) | |
851 | return cp + 1; | |
852 | return name; | |
853 | } | |
854 | ||
855 | /** | |
856 | * tomoyo_warn_log - Print warning or error message on console. | |
857 | * | |
858 | * @r: Pointer to "struct tomoyo_request_info". | |
859 | * @fmt: The printf()'s format string, followed by parameters. | |
860 | */ | |
861 | void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...) | |
862 | { | |
863 | va_list args; | |
864 | char *buffer; | |
865 | const struct tomoyo_domain_info * const domain = r->domain; | |
866 | const struct tomoyo_profile *profile = tomoyo_profile(domain->profile); | |
867 | switch (r->mode) { | |
868 | case TOMOYO_CONFIG_ENFORCING: | |
869 | if (!profile->enforcing->enforcing_verbose) | |
870 | return; | |
871 | break; | |
872 | case TOMOYO_CONFIG_PERMISSIVE: | |
873 | if (!profile->permissive->permissive_verbose) | |
874 | return; | |
875 | break; | |
876 | case TOMOYO_CONFIG_LEARNING: | |
877 | if (!profile->learning->learning_verbose) | |
878 | return; | |
879 | break; | |
880 | } | |
881 | buffer = kmalloc(4096, GFP_NOFS); | |
882 | if (!buffer) | |
883 | return; | |
884 | va_start(args, fmt); | |
885 | vsnprintf(buffer, 4095, fmt, args); | |
886 | va_end(args); | |
887 | buffer[4095] = '\0'; | |
888 | printk(KERN_WARNING "%s: Access %s denied for %s\n", | |
889 | r->mode == TOMOYO_CONFIG_ENFORCING ? "ERROR" : "WARNING", buffer, | |
890 | tomoyo_last_word(domain->domainname->name)); | |
891 | kfree(buffer); | |
892 | } | |
893 | ||
894 | /** | |
895 | * tomoyo_domain_quota_is_ok - Check for domain's quota. | |
896 | * | |
897 | * @r: Pointer to "struct tomoyo_request_info". | |
898 | * | |
899 | * Returns true if the domain is not exceeded quota, false otherwise. | |
900 | * | |
901 | * Caller holds tomoyo_read_lock(). | |
902 | */ | |
903 | bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r) | |
904 | { | |
905 | unsigned int count = 0; | |
906 | struct tomoyo_domain_info *domain = r->domain; | |
907 | struct tomoyo_acl_info *ptr; | |
908 | ||
909 | if (r->mode != TOMOYO_CONFIG_LEARNING) | |
910 | return false; | |
911 | if (!domain) | |
912 | return true; | |
913 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
914 | if (!ptr->is_deleted) | |
915 | continue; | |
916 | switch (ptr->type) { | |
917 | u16 perm; | |
918 | u8 i; | |
919 | case TOMOYO_TYPE_PATH_ACL: | |
920 | perm = container_of(ptr, struct tomoyo_path_acl, head) | |
921 | ->perm; | |
922 | for (i = 0; i < TOMOYO_MAX_PATH_OPERATION; i++) | |
923 | if (perm & (1 << i)) | |
924 | count++; | |
925 | if (perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
926 | count -= 2; | |
927 | break; | |
928 | case TOMOYO_TYPE_PATH2_ACL: | |
929 | perm = container_of(ptr, struct tomoyo_path2_acl, head) | |
930 | ->perm; | |
931 | for (i = 0; i < TOMOYO_MAX_PATH2_OPERATION; i++) | |
932 | if (perm & (1 << i)) | |
933 | count++; | |
934 | break; | |
935 | case TOMOYO_TYPE_PATH_NUMBER_ACL: | |
936 | perm = container_of(ptr, struct tomoyo_path_number_acl, | |
937 | head)->perm; | |
938 | for (i = 0; i < TOMOYO_MAX_PATH_NUMBER_OPERATION; i++) | |
939 | if (perm & (1 << i)) | |
940 | count++; | |
941 | break; | |
942 | case TOMOYO_TYPE_MKDEV_ACL: | |
943 | perm = container_of(ptr, struct tomoyo_mkdev_acl, | |
944 | head)->perm; | |
945 | for (i = 0; i < TOMOYO_MAX_MKDEV_OPERATION; i++) | |
946 | if (perm & (1 << i)) | |
947 | count++; | |
948 | break; | |
949 | default: | |
950 | count++; | |
951 | } | |
952 | } | |
953 | if (count < tomoyo_profile(domain->profile)->learning-> | |
954 | learning_max_entry) | |
955 | return true; | |
956 | if (!domain->quota_warned) { | |
957 | domain->quota_warned = true; | |
958 | printk(KERN_WARNING "TOMOYO-WARNING: " | |
959 | "Domain '%s' has so many ACLs to hold. " | |
960 | "Stopped learning mode.\n", domain->domainname->name); | |
961 | } | |
962 | return false; | |
963 | } |