Commit | Line | Data |
---|---|---|
c3ef1500 TH |
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 | ||
2c47ab93 TH |
18 | /* |
19 | * Mapping table from "enum tomoyo_mac_index" to | |
20 | * "enum tomoyo_mac_category_index". | |
21 | */ | |
22 | const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX] = { | |
23 | /* CONFIG::file group */ | |
24 | [TOMOYO_MAC_FILE_EXECUTE] = TOMOYO_MAC_CATEGORY_FILE, | |
25 | [TOMOYO_MAC_FILE_OPEN] = TOMOYO_MAC_CATEGORY_FILE, | |
26 | [TOMOYO_MAC_FILE_CREATE] = TOMOYO_MAC_CATEGORY_FILE, | |
27 | [TOMOYO_MAC_FILE_UNLINK] = TOMOYO_MAC_CATEGORY_FILE, | |
28 | [TOMOYO_MAC_FILE_GETATTR] = TOMOYO_MAC_CATEGORY_FILE, | |
29 | [TOMOYO_MAC_FILE_MKDIR] = TOMOYO_MAC_CATEGORY_FILE, | |
30 | [TOMOYO_MAC_FILE_RMDIR] = TOMOYO_MAC_CATEGORY_FILE, | |
31 | [TOMOYO_MAC_FILE_MKFIFO] = TOMOYO_MAC_CATEGORY_FILE, | |
32 | [TOMOYO_MAC_FILE_MKSOCK] = TOMOYO_MAC_CATEGORY_FILE, | |
33 | [TOMOYO_MAC_FILE_TRUNCATE] = TOMOYO_MAC_CATEGORY_FILE, | |
34 | [TOMOYO_MAC_FILE_SYMLINK] = TOMOYO_MAC_CATEGORY_FILE, | |
35 | [TOMOYO_MAC_FILE_MKBLOCK] = TOMOYO_MAC_CATEGORY_FILE, | |
36 | [TOMOYO_MAC_FILE_MKCHAR] = TOMOYO_MAC_CATEGORY_FILE, | |
37 | [TOMOYO_MAC_FILE_LINK] = TOMOYO_MAC_CATEGORY_FILE, | |
38 | [TOMOYO_MAC_FILE_RENAME] = TOMOYO_MAC_CATEGORY_FILE, | |
39 | [TOMOYO_MAC_FILE_CHMOD] = TOMOYO_MAC_CATEGORY_FILE, | |
40 | [TOMOYO_MAC_FILE_CHOWN] = TOMOYO_MAC_CATEGORY_FILE, | |
41 | [TOMOYO_MAC_FILE_CHGRP] = TOMOYO_MAC_CATEGORY_FILE, | |
42 | [TOMOYO_MAC_FILE_IOCTL] = TOMOYO_MAC_CATEGORY_FILE, | |
43 | [TOMOYO_MAC_FILE_CHROOT] = TOMOYO_MAC_CATEGORY_FILE, | |
44 | [TOMOYO_MAC_FILE_MOUNT] = TOMOYO_MAC_CATEGORY_FILE, | |
45 | [TOMOYO_MAC_FILE_UMOUNT] = TOMOYO_MAC_CATEGORY_FILE, | |
46 | [TOMOYO_MAC_FILE_PIVOT_ROOT] = TOMOYO_MAC_CATEGORY_FILE, | |
47 | }; | |
48 | ||
b22b8b9f TH |
49 | /** |
50 | * tomoyo_convert_time - Convert time_t to YYYY/MM/DD hh/mm/ss. | |
51 | * | |
52 | * @time: Seconds since 1970/01/01 00:00:00. | |
53 | * @stamp: Pointer to "struct tomoyo_time". | |
54 | * | |
55 | * Returns nothing. | |
56 | * | |
57 | * This function does not handle Y2038 problem. | |
58 | */ | |
59 | void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp) | |
60 | { | |
61 | static const u16 tomoyo_eom[2][12] = { | |
62 | { 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, | |
63 | { 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } | |
64 | }; | |
65 | u16 y; | |
66 | u8 m; | |
67 | bool r; | |
68 | stamp->sec = time % 60; | |
69 | time /= 60; | |
70 | stamp->min = time % 60; | |
71 | time /= 60; | |
72 | stamp->hour = time % 24; | |
73 | time /= 24; | |
74 | for (y = 1970; ; y++) { | |
75 | const unsigned short days = (y & 3) ? 365 : 366; | |
76 | if (time < days) | |
77 | break; | |
78 | time -= days; | |
79 | } | |
80 | r = (y & 3) == 0; | |
81 | for (m = 0; m < 11 && time >= tomoyo_eom[r][m]; m++) | |
82 | ; | |
83 | if (m) | |
84 | time -= tomoyo_eom[r][m - 1]; | |
85 | stamp->year = y; | |
86 | stamp->month = ++m; | |
87 | stamp->day = ++time; | |
88 | } | |
89 | ||
a238cf5b TH |
90 | /** |
91 | * tomoyo_permstr - Find permission keywords. | |
92 | * | |
93 | * @string: String representation for permissions in foo/bar/buz format. | |
94 | * @keyword: Keyword to find from @string/ | |
95 | * | |
96 | * Returns ture if @keyword was found in @string, false otherwise. | |
97 | * | |
98 | * This function assumes that strncmp(w1, w2, strlen(w1)) != 0 if w1 != w2. | |
99 | */ | |
100 | bool tomoyo_permstr(const char *string, const char *keyword) | |
101 | { | |
102 | const char *cp = strstr(string, keyword); | |
103 | if (cp) | |
104 | return cp == string || *(cp - 1) == '/'; | |
105 | return false; | |
106 | } | |
107 | ||
108 | /** | |
109 | * tomoyo_read_token - Read a word from a line. | |
110 | * | |
111 | * @param: Pointer to "struct tomoyo_acl_param". | |
112 | * | |
113 | * Returns a word on success, "" otherwise. | |
114 | * | |
115 | * To allow the caller to skip NULL check, this function returns "" rather than | |
116 | * NULL if there is no more words to read. | |
117 | */ | |
118 | char *tomoyo_read_token(struct tomoyo_acl_param *param) | |
119 | { | |
120 | char *pos = param->data; | |
121 | char *del = strchr(pos, ' '); | |
122 | if (del) | |
123 | *del++ = '\0'; | |
124 | else | |
125 | del = pos + strlen(pos); | |
126 | param->data = del; | |
127 | return pos; | |
128 | } | |
129 | ||
c3ef1500 TH |
130 | /** |
131 | * tomoyo_parse_ulong - Parse an "unsigned long" value. | |
132 | * | |
133 | * @result: Pointer to "unsigned long". | |
134 | * @str: Pointer to string to parse. | |
135 | * | |
0df7e8b8 | 136 | * Returns one of values in "enum tomoyo_value_type". |
c3ef1500 TH |
137 | * |
138 | * The @src is updated to point the first character after the value | |
139 | * on success. | |
140 | */ | |
e2bf6907 | 141 | static u8 tomoyo_parse_ulong(unsigned long *result, char **str) |
c3ef1500 TH |
142 | { |
143 | const char *cp = *str; | |
144 | char *ep; | |
145 | int base = 10; | |
146 | if (*cp == '0') { | |
147 | char c = *(cp + 1); | |
148 | if (c == 'x' || c == 'X') { | |
149 | base = 16; | |
150 | cp += 2; | |
151 | } else if (c >= '0' && c <= '7') { | |
152 | base = 8; | |
153 | cp++; | |
154 | } | |
155 | } | |
156 | *result = simple_strtoul(cp, &ep, base); | |
157 | if (cp == ep) | |
0df7e8b8 | 158 | return TOMOYO_VALUE_TYPE_INVALID; |
c3ef1500 TH |
159 | *str = ep; |
160 | switch (base) { | |
161 | case 16: | |
162 | return TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
163 | case 8: | |
164 | return TOMOYO_VALUE_TYPE_OCTAL; | |
165 | default: | |
166 | return TOMOYO_VALUE_TYPE_DECIMAL; | |
167 | } | |
168 | } | |
169 | ||
170 | /** | |
171 | * tomoyo_print_ulong - Print an "unsigned long" value. | |
172 | * | |
173 | * @buffer: Pointer to buffer. | |
174 | * @buffer_len: Size of @buffer. | |
175 | * @value: An "unsigned long" value. | |
176 | * @type: Type of @value. | |
177 | * | |
178 | * Returns nothing. | |
179 | */ | |
180 | void tomoyo_print_ulong(char *buffer, const int buffer_len, | |
181 | const unsigned long value, const u8 type) | |
182 | { | |
183 | if (type == TOMOYO_VALUE_TYPE_DECIMAL) | |
184 | snprintf(buffer, buffer_len, "%lu", value); | |
185 | else if (type == TOMOYO_VALUE_TYPE_OCTAL) | |
186 | snprintf(buffer, buffer_len, "0%lo", value); | |
187 | else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL) | |
188 | snprintf(buffer, buffer_len, "0x%lX", value); | |
189 | else | |
190 | snprintf(buffer, buffer_len, "type(%u)", type); | |
191 | } | |
192 | ||
193 | /** | |
194 | * tomoyo_parse_name_union - Parse a tomoyo_name_union. | |
195 | * | |
a238cf5b TH |
196 | * @param: Pointer to "struct tomoyo_acl_param". |
197 | * @ptr: Pointer to "struct tomoyo_name_union". | |
c3ef1500 TH |
198 | * |
199 | * Returns true on success, false otherwise. | |
200 | */ | |
a238cf5b | 201 | bool tomoyo_parse_name_union(struct tomoyo_acl_param *param, |
c3ef1500 TH |
202 | struct tomoyo_name_union *ptr) |
203 | { | |
a238cf5b TH |
204 | char *filename; |
205 | if (param->data[0] == '@') { | |
206 | param->data++; | |
207 | ptr->group = tomoyo_get_group(param, TOMOYO_PATH_GROUP); | |
c3ef1500 TH |
208 | return ptr->group != NULL; |
209 | } | |
a238cf5b TH |
210 | filename = tomoyo_read_token(param); |
211 | if (!tomoyo_correct_word(filename)) | |
212 | return false; | |
c3ef1500 | 213 | ptr->filename = tomoyo_get_name(filename); |
c3ef1500 TH |
214 | return ptr->filename != NULL; |
215 | } | |
216 | ||
217 | /** | |
218 | * tomoyo_parse_number_union - Parse a tomoyo_number_union. | |
219 | * | |
a238cf5b TH |
220 | * @param: Pointer to "struct tomoyo_acl_param". |
221 | * @ptr: Pointer to "struct tomoyo_number_union". | |
c3ef1500 TH |
222 | * |
223 | * Returns true on success, false otherwise. | |
224 | */ | |
a238cf5b TH |
225 | bool tomoyo_parse_number_union(struct tomoyo_acl_param *param, |
226 | struct tomoyo_number_union *ptr) | |
c3ef1500 | 227 | { |
a238cf5b | 228 | char *data; |
c3ef1500 TH |
229 | u8 type; |
230 | unsigned long v; | |
a238cf5b TH |
231 | memset(ptr, 0, sizeof(*ptr)); |
232 | if (param->data[0] == '@') { | |
233 | param->data++; | |
234 | ptr->group = tomoyo_get_group(param, TOMOYO_NUMBER_GROUP); | |
235 | return ptr->group != NULL; | |
c3ef1500 | 236 | } |
a238cf5b | 237 | data = tomoyo_read_token(param); |
c3ef1500 | 238 | type = tomoyo_parse_ulong(&v, &data); |
a238cf5b | 239 | if (type == TOMOYO_VALUE_TYPE_INVALID) |
c3ef1500 | 240 | return false; |
a238cf5b TH |
241 | ptr->values[0] = v; |
242 | ptr->value_type[0] = type; | |
c3ef1500 | 243 | if (!*data) { |
a238cf5b TH |
244 | ptr->values[1] = v; |
245 | ptr->value_type[1] = type; | |
c3ef1500 TH |
246 | return true; |
247 | } | |
248 | if (*data++ != '-') | |
249 | return false; | |
250 | type = tomoyo_parse_ulong(&v, &data); | |
a238cf5b | 251 | if (type == TOMOYO_VALUE_TYPE_INVALID || *data || ptr->values[0] > v) |
c3ef1500 | 252 | return false; |
a238cf5b TH |
253 | ptr->values[1] = v; |
254 | ptr->value_type[1] = type; | |
c3ef1500 TH |
255 | return true; |
256 | } | |
257 | ||
258 | /** | |
75093152 | 259 | * tomoyo_byte_range - Check whether the string is a \ooo style octal value. |
c3ef1500 TH |
260 | * |
261 | * @str: Pointer to the string. | |
262 | * | |
263 | * Returns true if @str is a \ooo style octal value, false otherwise. | |
264 | * | |
265 | * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF. | |
266 | * This function verifies that \ooo is in valid range. | |
267 | */ | |
75093152 | 268 | static inline bool tomoyo_byte_range(const char *str) |
c3ef1500 TH |
269 | { |
270 | return *str >= '0' && *str++ <= '3' && | |
271 | *str >= '0' && *str++ <= '7' && | |
272 | *str >= '0' && *str <= '7'; | |
273 | } | |
274 | ||
275 | /** | |
75093152 | 276 | * tomoyo_alphabet_char - Check whether the character is an alphabet. |
c3ef1500 TH |
277 | * |
278 | * @c: The character to check. | |
279 | * | |
280 | * Returns true if @c is an alphabet character, false otherwise. | |
281 | */ | |
75093152 | 282 | static inline bool tomoyo_alphabet_char(const char c) |
c3ef1500 TH |
283 | { |
284 | return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'); | |
285 | } | |
286 | ||
287 | /** | |
288 | * tomoyo_make_byte - Make byte value from three octal characters. | |
289 | * | |
290 | * @c1: The first character. | |
291 | * @c2: The second character. | |
292 | * @c3: The third character. | |
293 | * | |
294 | * Returns byte value. | |
295 | */ | |
296 | static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3) | |
297 | { | |
298 | return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0'); | |
299 | } | |
300 | ||
0df7e8b8 TH |
301 | /** |
302 | * tomoyo_valid - Check whether the character is a valid char. | |
303 | * | |
304 | * @c: The character to check. | |
305 | * | |
306 | * Returns true if @c is a valid character, false otherwise. | |
307 | */ | |
308 | static inline bool tomoyo_valid(const unsigned char c) | |
309 | { | |
310 | return c > ' ' && c < 127; | |
311 | } | |
312 | ||
313 | /** | |
314 | * tomoyo_invalid - Check whether the character is an invalid char. | |
315 | * | |
316 | * @c: The character to check. | |
317 | * | |
318 | * Returns true if @c is an invalid character, false otherwise. | |
319 | */ | |
320 | static inline bool tomoyo_invalid(const unsigned char c) | |
321 | { | |
322 | return c && (c <= ' ' || c >= 127); | |
323 | } | |
324 | ||
c3ef1500 TH |
325 | /** |
326 | * tomoyo_str_starts - Check whether the given string starts with the given keyword. | |
327 | * | |
328 | * @src: Pointer to pointer to the string. | |
329 | * @find: Pointer to the keyword. | |
330 | * | |
331 | * Returns true if @src starts with @find, false otherwise. | |
332 | * | |
333 | * The @src is updated to point the first character after the @find | |
334 | * if @src starts with @find. | |
335 | */ | |
336 | bool tomoyo_str_starts(char **src, const char *find) | |
337 | { | |
338 | const int len = strlen(find); | |
339 | char *tmp = *src; | |
340 | ||
341 | if (strncmp(tmp, find, len)) | |
342 | return false; | |
343 | tmp += len; | |
344 | *src = tmp; | |
345 | return true; | |
346 | } | |
347 | ||
348 | /** | |
349 | * tomoyo_normalize_line - Format string. | |
350 | * | |
351 | * @buffer: The line to normalize. | |
352 | * | |
353 | * Leading and trailing whitespaces are removed. | |
354 | * Multiple whitespaces are packed into single space. | |
355 | * | |
356 | * Returns nothing. | |
357 | */ | |
358 | void tomoyo_normalize_line(unsigned char *buffer) | |
359 | { | |
360 | unsigned char *sp = buffer; | |
361 | unsigned char *dp = buffer; | |
362 | bool first = true; | |
363 | ||
75093152 | 364 | while (tomoyo_invalid(*sp)) |
c3ef1500 TH |
365 | sp++; |
366 | while (*sp) { | |
367 | if (!first) | |
368 | *dp++ = ' '; | |
369 | first = false; | |
75093152 | 370 | while (tomoyo_valid(*sp)) |
c3ef1500 | 371 | *dp++ = *sp++; |
75093152 | 372 | while (tomoyo_invalid(*sp)) |
c3ef1500 TH |
373 | sp++; |
374 | } | |
375 | *dp = '\0'; | |
376 | } | |
377 | ||
c3ef1500 | 378 | /** |
75093152 | 379 | * tomoyo_correct_word2 - Validate a string. |
c3ef1500 | 380 | * |
3f629636 TH |
381 | * @string: The string to check. May be non-'\0'-terminated. |
382 | * @len: Length of @string. | |
c3ef1500 | 383 | * |
3f629636 TH |
384 | * Check whether the given string follows the naming rules. |
385 | * Returns true if @string follows the naming rules, false otherwise. | |
c3ef1500 | 386 | */ |
75093152 | 387 | static bool tomoyo_correct_word2(const char *string, size_t len) |
c3ef1500 | 388 | { |
3f629636 | 389 | const char *const start = string; |
c3ef1500 | 390 | bool in_repetition = false; |
c3ef1500 TH |
391 | unsigned char c; |
392 | unsigned char d; | |
393 | unsigned char e; | |
3f629636 | 394 | if (!len) |
c3ef1500 | 395 | goto out; |
3f629636 TH |
396 | while (len--) { |
397 | c = *string++; | |
c3ef1500 | 398 | if (c == '\\') { |
3f629636 TH |
399 | if (!len--) |
400 | goto out; | |
401 | c = *string++; | |
c3ef1500 TH |
402 | switch (c) { |
403 | case '\\': /* "\\" */ | |
404 | continue; | |
405 | case '$': /* "\$" */ | |
406 | case '+': /* "\+" */ | |
407 | case '?': /* "\?" */ | |
408 | case '*': /* "\*" */ | |
409 | case '@': /* "\@" */ | |
410 | case 'x': /* "\x" */ | |
411 | case 'X': /* "\X" */ | |
412 | case 'a': /* "\a" */ | |
413 | case 'A': /* "\A" */ | |
414 | case '-': /* "\-" */ | |
c3ef1500 TH |
415 | continue; |
416 | case '{': /* "/\{" */ | |
3f629636 | 417 | if (string - 3 < start || *(string - 3) != '/') |
c3ef1500 | 418 | break; |
c3ef1500 TH |
419 | in_repetition = true; |
420 | continue; | |
421 | case '}': /* "\}/" */ | |
3f629636 | 422 | if (*string != '/') |
c3ef1500 TH |
423 | break; |
424 | if (!in_repetition) | |
425 | break; | |
426 | in_repetition = false; | |
427 | continue; | |
428 | case '0': /* "\ooo" */ | |
429 | case '1': | |
430 | case '2': | |
431 | case '3': | |
3f629636 | 432 | if (!len-- || !len--) |
c3ef1500 | 433 | break; |
3f629636 TH |
434 | d = *string++; |
435 | e = *string++; | |
436 | if (d < '0' || d > '7' || e < '0' || e > '7') | |
c3ef1500 TH |
437 | break; |
438 | c = tomoyo_make_byte(c, d, e); | |
75093152 | 439 | if (tomoyo_invalid(c)) |
c3ef1500 TH |
440 | continue; /* pattern is not \000 */ |
441 | } | |
442 | goto out; | |
443 | } else if (in_repetition && c == '/') { | |
444 | goto out; | |
75093152 | 445 | } else if (tomoyo_invalid(c)) { |
c3ef1500 TH |
446 | goto out; |
447 | } | |
448 | } | |
c3ef1500 TH |
449 | if (in_repetition) |
450 | goto out; | |
451 | return true; | |
452 | out: | |
453 | return false; | |
454 | } | |
455 | ||
3f629636 | 456 | /** |
75093152 | 457 | * tomoyo_correct_word - Validate a string. |
3f629636 TH |
458 | * |
459 | * @string: The string to check. | |
460 | * | |
461 | * Check whether the given string follows the naming rules. | |
462 | * Returns true if @string follows the naming rules, false otherwise. | |
463 | */ | |
75093152 | 464 | bool tomoyo_correct_word(const char *string) |
3f629636 | 465 | { |
75093152 | 466 | return tomoyo_correct_word2(string, strlen(string)); |
3f629636 TH |
467 | } |
468 | ||
469 | /** | |
75093152 | 470 | * tomoyo_correct_path - Validate a pathname. |
3f629636 TH |
471 | * |
472 | * @filename: The pathname to check. | |
473 | * | |
474 | * Check whether the given pathname follows the naming rules. | |
475 | * Returns true if @filename follows the naming rules, false otherwise. | |
476 | */ | |
75093152 | 477 | bool tomoyo_correct_path(const char *filename) |
3f629636 | 478 | { |
75093152 | 479 | return *filename == '/' && tomoyo_correct_word(filename); |
3f629636 TH |
480 | } |
481 | ||
c3ef1500 | 482 | /** |
75093152 | 483 | * tomoyo_correct_domain - Check whether the given domainname follows the naming rules. |
c3ef1500 | 484 | * |
3f629636 | 485 | * @domainname: The domainname to check. |
c3ef1500 TH |
486 | * |
487 | * Returns true if @domainname follows the naming rules, false otherwise. | |
488 | */ | |
75093152 | 489 | bool tomoyo_correct_domain(const unsigned char *domainname) |
c3ef1500 | 490 | { |
bd03a3e4 TH |
491 | if (!domainname || !tomoyo_domain_def(domainname)) |
492 | return false; | |
493 | domainname = strchr(domainname, ' '); | |
494 | if (!domainname++) | |
c3ef1500 | 495 | return true; |
3f629636 TH |
496 | while (1) { |
497 | const unsigned char *cp = strchr(domainname, ' '); | |
498 | if (!cp) | |
499 | break; | |
500 | if (*domainname != '/' || | |
e77dc346 | 501 | !tomoyo_correct_word2(domainname, cp - domainname)) |
bd03a3e4 | 502 | return false; |
3f629636 TH |
503 | domainname = cp + 1; |
504 | } | |
75093152 | 505 | return tomoyo_correct_path(domainname); |
c3ef1500 TH |
506 | } |
507 | ||
508 | /** | |
75093152 | 509 | * tomoyo_domain_def - Check whether the given token can be a domainname. |
c3ef1500 TH |
510 | * |
511 | * @buffer: The token to check. | |
512 | * | |
513 | * Returns true if @buffer possibly be a domainname, false otherwise. | |
514 | */ | |
75093152 | 515 | bool tomoyo_domain_def(const unsigned char *buffer) |
c3ef1500 | 516 | { |
bd03a3e4 TH |
517 | const unsigned char *cp; |
518 | int len; | |
519 | if (*buffer != '<') | |
520 | return false; | |
521 | cp = strchr(buffer, ' '); | |
522 | if (!cp) | |
523 | len = strlen(buffer); | |
524 | else | |
525 | len = cp - buffer; | |
526 | if (buffer[len - 1] != '>' || | |
527 | !tomoyo_correct_word2(buffer + 1, len - 2)) | |
528 | return false; | |
529 | return true; | |
c3ef1500 TH |
530 | } |
531 | ||
532 | /** | |
533 | * tomoyo_find_domain - Find a domain by the given name. | |
534 | * | |
535 | * @domainname: The domainname to find. | |
536 | * | |
537 | * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise. | |
538 | * | |
539 | * Caller holds tomoyo_read_lock(). | |
540 | */ | |
541 | struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname) | |
542 | { | |
543 | struct tomoyo_domain_info *domain; | |
544 | struct tomoyo_path_info name; | |
545 | ||
546 | name.name = domainname; | |
547 | tomoyo_fill_path_info(&name); | |
548 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { | |
549 | if (!domain->is_deleted && | |
550 | !tomoyo_pathcmp(&name, domain->domainname)) | |
551 | return domain; | |
552 | } | |
553 | return NULL; | |
554 | } | |
555 | ||
556 | /** | |
557 | * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token. | |
558 | * | |
559 | * @filename: The string to evaluate. | |
560 | * | |
561 | * Returns the initial length without a pattern in @filename. | |
562 | */ | |
563 | static int tomoyo_const_part_length(const char *filename) | |
564 | { | |
565 | char c; | |
566 | int len = 0; | |
567 | ||
568 | if (!filename) | |
569 | return 0; | |
570 | while ((c = *filename++) != '\0') { | |
571 | if (c != '\\') { | |
572 | len++; | |
573 | continue; | |
574 | } | |
575 | c = *filename++; | |
576 | switch (c) { | |
577 | case '\\': /* "\\" */ | |
578 | len += 2; | |
579 | continue; | |
580 | case '0': /* "\ooo" */ | |
581 | case '1': | |
582 | case '2': | |
583 | case '3': | |
584 | c = *filename++; | |
585 | if (c < '0' || c > '7') | |
586 | break; | |
587 | c = *filename++; | |
588 | if (c < '0' || c > '7') | |
589 | break; | |
590 | len += 4; | |
591 | continue; | |
592 | } | |
593 | break; | |
594 | } | |
595 | return len; | |
596 | } | |
597 | ||
598 | /** | |
599 | * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members. | |
600 | * | |
601 | * @ptr: Pointer to "struct tomoyo_path_info" to fill in. | |
602 | * | |
603 | * The caller sets "struct tomoyo_path_info"->name. | |
604 | */ | |
605 | void tomoyo_fill_path_info(struct tomoyo_path_info *ptr) | |
606 | { | |
607 | const char *name = ptr->name; | |
608 | const int len = strlen(name); | |
609 | ||
610 | ptr->const_len = tomoyo_const_part_length(name); | |
611 | ptr->is_dir = len && (name[len - 1] == '/'); | |
612 | ptr->is_patterned = (ptr->const_len < len); | |
613 | ptr->hash = full_name_hash(name, len); | |
614 | } | |
615 | ||
616 | /** | |
617 | * tomoyo_file_matches_pattern2 - Pattern matching without '/' character and "\-" pattern. | |
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_pattern2(const char *filename, | |
627 | const char *filename_end, | |
628 | const char *pattern, | |
629 | const char *pattern_end) | |
630 | { | |
631 | while (filename < filename_end && pattern < pattern_end) { | |
632 | char c; | |
633 | if (*pattern != '\\') { | |
634 | if (*filename++ != *pattern++) | |
635 | return false; | |
636 | continue; | |
637 | } | |
638 | c = *filename; | |
639 | pattern++; | |
640 | switch (*pattern) { | |
641 | int i; | |
642 | int j; | |
643 | case '?': | |
644 | if (c == '/') { | |
645 | return false; | |
646 | } else if (c == '\\') { | |
647 | if (filename[1] == '\\') | |
648 | filename++; | |
75093152 | 649 | else if (tomoyo_byte_range(filename + 1)) |
c3ef1500 TH |
650 | filename += 3; |
651 | else | |
652 | return false; | |
653 | } | |
654 | break; | |
655 | case '\\': | |
656 | if (c != '\\') | |
657 | return false; | |
658 | if (*++filename != '\\') | |
659 | return false; | |
660 | break; | |
661 | case '+': | |
662 | if (!isdigit(c)) | |
663 | return false; | |
664 | break; | |
665 | case 'x': | |
666 | if (!isxdigit(c)) | |
667 | return false; | |
668 | break; | |
669 | case 'a': | |
75093152 | 670 | if (!tomoyo_alphabet_char(c)) |
c3ef1500 TH |
671 | return false; |
672 | break; | |
673 | case '0': | |
674 | case '1': | |
675 | case '2': | |
676 | case '3': | |
75093152 | 677 | if (c == '\\' && tomoyo_byte_range(filename + 1) |
c3ef1500 TH |
678 | && strncmp(filename + 1, pattern, 3) == 0) { |
679 | filename += 3; | |
680 | pattern += 2; | |
681 | break; | |
682 | } | |
683 | return false; /* Not matched. */ | |
684 | case '*': | |
685 | case '@': | |
686 | for (i = 0; i <= filename_end - filename; i++) { | |
687 | if (tomoyo_file_matches_pattern2( | |
688 | filename + i, filename_end, | |
689 | pattern + 1, pattern_end)) | |
690 | return true; | |
691 | c = filename[i]; | |
692 | if (c == '.' && *pattern == '@') | |
693 | break; | |
694 | if (c != '\\') | |
695 | continue; | |
696 | if (filename[i + 1] == '\\') | |
697 | i++; | |
75093152 | 698 | else if (tomoyo_byte_range(filename + i + 1)) |
c3ef1500 TH |
699 | i += 3; |
700 | else | |
701 | break; /* Bad pattern. */ | |
702 | } | |
703 | return false; /* Not matched. */ | |
704 | default: | |
705 | j = 0; | |
706 | c = *pattern; | |
707 | if (c == '$') { | |
708 | while (isdigit(filename[j])) | |
709 | j++; | |
710 | } else if (c == 'X') { | |
711 | while (isxdigit(filename[j])) | |
712 | j++; | |
713 | } else if (c == 'A') { | |
75093152 | 714 | while (tomoyo_alphabet_char(filename[j])) |
c3ef1500 TH |
715 | j++; |
716 | } | |
717 | for (i = 1; i <= j; i++) { | |
718 | if (tomoyo_file_matches_pattern2( | |
719 | filename + i, filename_end, | |
720 | pattern + 1, pattern_end)) | |
721 | return true; | |
722 | } | |
723 | return false; /* Not matched or bad pattern. */ | |
724 | } | |
725 | filename++; | |
726 | pattern++; | |
727 | } | |
728 | while (*pattern == '\\' && | |
729 | (*(pattern + 1) == '*' || *(pattern + 1) == '@')) | |
730 | pattern += 2; | |
731 | return filename == filename_end && pattern == pattern_end; | |
732 | } | |
733 | ||
734 | /** | |
735 | * tomoyo_file_matches_pattern - Pattern matching without '/' character. | |
736 | * | |
737 | * @filename: The start of string to check. | |
738 | * @filename_end: The end of string to check. | |
739 | * @pattern: The start of pattern to compare. | |
740 | * @pattern_end: The end of pattern to compare. | |
741 | * | |
742 | * Returns true if @filename matches @pattern, false otherwise. | |
743 | */ | |
744 | static bool tomoyo_file_matches_pattern(const char *filename, | |
745 | const char *filename_end, | |
746 | const char *pattern, | |
747 | const char *pattern_end) | |
748 | { | |
749 | const char *pattern_start = pattern; | |
750 | bool first = true; | |
751 | bool result; | |
752 | ||
753 | while (pattern < pattern_end - 1) { | |
754 | /* Split at "\-" pattern. */ | |
755 | if (*pattern++ != '\\' || *pattern++ != '-') | |
756 | continue; | |
757 | result = tomoyo_file_matches_pattern2(filename, | |
758 | filename_end, | |
759 | pattern_start, | |
760 | pattern - 2); | |
761 | if (first) | |
762 | result = !result; | |
763 | if (result) | |
764 | return false; | |
765 | first = false; | |
766 | pattern_start = pattern; | |
767 | } | |
768 | result = tomoyo_file_matches_pattern2(filename, filename_end, | |
769 | pattern_start, pattern_end); | |
770 | return first ? result : !result; | |
771 | } | |
772 | ||
773 | /** | |
774 | * tomoyo_path_matches_pattern2 - Do pathname pattern matching. | |
775 | * | |
776 | * @f: The start of string to check. | |
777 | * @p: The start of pattern to compare. | |
778 | * | |
779 | * Returns true if @f matches @p, false otherwise. | |
780 | */ | |
781 | static bool tomoyo_path_matches_pattern2(const char *f, const char *p) | |
782 | { | |
783 | const char *f_delimiter; | |
784 | const char *p_delimiter; | |
785 | ||
786 | while (*f && *p) { | |
787 | f_delimiter = strchr(f, '/'); | |
788 | if (!f_delimiter) | |
789 | f_delimiter = f + strlen(f); | |
790 | p_delimiter = strchr(p, '/'); | |
791 | if (!p_delimiter) | |
792 | p_delimiter = p + strlen(p); | |
793 | if (*p == '\\' && *(p + 1) == '{') | |
794 | goto recursive; | |
795 | if (!tomoyo_file_matches_pattern(f, f_delimiter, p, | |
796 | p_delimiter)) | |
797 | return false; | |
798 | f = f_delimiter; | |
799 | if (*f) | |
800 | f++; | |
801 | p = p_delimiter; | |
802 | if (*p) | |
803 | p++; | |
804 | } | |
805 | /* Ignore trailing "\*" and "\@" in @pattern. */ | |
806 | while (*p == '\\' && | |
807 | (*(p + 1) == '*' || *(p + 1) == '@')) | |
808 | p += 2; | |
809 | return !*f && !*p; | |
810 | recursive: | |
811 | /* | |
812 | * The "\{" pattern is permitted only after '/' character. | |
813 | * This guarantees that below "*(p - 1)" is safe. | |
814 | * Also, the "\}" pattern is permitted only before '/' character | |
815 | * so that "\{" + "\}" pair will not break the "\-" operator. | |
816 | */ | |
817 | if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' || | |
818 | *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\') | |
819 | return false; /* Bad pattern. */ | |
820 | do { | |
821 | /* Compare current component with pattern. */ | |
822 | if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2, | |
823 | p_delimiter - 2)) | |
824 | break; | |
825 | /* Proceed to next component. */ | |
826 | f = f_delimiter; | |
827 | if (!*f) | |
828 | break; | |
829 | f++; | |
830 | /* Continue comparison. */ | |
831 | if (tomoyo_path_matches_pattern2(f, p_delimiter + 1)) | |
832 | return true; | |
833 | f_delimiter = strchr(f, '/'); | |
834 | } while (f_delimiter); | |
835 | return false; /* Not matched. */ | |
836 | } | |
837 | ||
838 | /** | |
839 | * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern. | |
840 | * | |
841 | * @filename: The filename to check. | |
842 | * @pattern: The pattern to compare. | |
843 | * | |
844 | * Returns true if matches, false otherwise. | |
845 | * | |
846 | * The following patterns are available. | |
847 | * \\ \ itself. | |
848 | * \ooo Octal representation of a byte. | |
849 | * \* Zero or more repetitions of characters other than '/'. | |
850 | * \@ Zero or more repetitions of characters other than '/' or '.'. | |
851 | * \? 1 byte character other than '/'. | |
852 | * \$ One or more repetitions of decimal digits. | |
853 | * \+ 1 decimal digit. | |
854 | * \X One or more repetitions of hexadecimal digits. | |
855 | * \x 1 hexadecimal digit. | |
856 | * \A One or more repetitions of alphabet characters. | |
857 | * \a 1 alphabet character. | |
858 | * | |
859 | * \- Subtraction operator. | |
860 | * | |
861 | * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/ | |
862 | * /dir/dir/dir/ ). | |
863 | */ | |
864 | bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename, | |
865 | const struct tomoyo_path_info *pattern) | |
866 | { | |
867 | const char *f = filename->name; | |
868 | const char *p = pattern->name; | |
869 | const int len = pattern->const_len; | |
870 | ||
871 | /* If @pattern doesn't contain pattern, I can use strcmp(). */ | |
872 | if (!pattern->is_patterned) | |
873 | return !tomoyo_pathcmp(filename, pattern); | |
874 | /* Don't compare directory and non-directory. */ | |
875 | if (filename->is_dir != pattern->is_dir) | |
876 | return false; | |
877 | /* Compare the initial length without patterns. */ | |
878 | if (strncmp(f, p, len)) | |
879 | return false; | |
880 | f += len; | |
881 | p += len; | |
882 | return tomoyo_path_matches_pattern2(f, p); | |
883 | } | |
884 | ||
885 | /** | |
886 | * tomoyo_get_exe - Get tomoyo_realpath() of current process. | |
887 | * | |
888 | * Returns the tomoyo_realpath() of current process on success, NULL otherwise. | |
889 | * | |
890 | * This function uses kzalloc(), so the caller must call kfree() | |
891 | * if this function didn't return NULL. | |
892 | */ | |
893 | const char *tomoyo_get_exe(void) | |
894 | { | |
895 | struct mm_struct *mm = current->mm; | |
896 | struct vm_area_struct *vma; | |
897 | const char *cp = NULL; | |
898 | ||
899 | if (!mm) | |
900 | return NULL; | |
901 | down_read(&mm->mmap_sem); | |
902 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
903 | if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) { | |
904 | cp = tomoyo_realpath_from_path(&vma->vm_file->f_path); | |
905 | break; | |
906 | } | |
907 | } | |
908 | up_read(&mm->mmap_sem); | |
909 | return cp; | |
910 | } | |
911 | ||
57c2590f TH |
912 | /** |
913 | * tomoyo_get_mode - Get MAC mode. | |
914 | * | |
bd03a3e4 | 915 | * @ns: Pointer to "struct tomoyo_policy_namespace". |
57c2590f TH |
916 | * @profile: Profile number. |
917 | * @index: Index number of functionality. | |
918 | * | |
919 | * Returns mode. | |
920 | */ | |
bd03a3e4 TH |
921 | int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile, |
922 | const u8 index) | |
57c2590f TH |
923 | { |
924 | u8 mode; | |
925 | const u8 category = TOMOYO_MAC_CATEGORY_FILE; | |
926 | if (!tomoyo_policy_loaded) | |
927 | return TOMOYO_CONFIG_DISABLED; | |
bd03a3e4 | 928 | mode = tomoyo_profile(ns, profile)->config[index]; |
57c2590f | 929 | if (mode == TOMOYO_CONFIG_USE_DEFAULT) |
bd03a3e4 | 930 | mode = tomoyo_profile(ns, profile)->config[category]; |
57c2590f | 931 | if (mode == TOMOYO_CONFIG_USE_DEFAULT) |
bd03a3e4 | 932 | mode = tomoyo_profile(ns, profile)->default_config; |
57c2590f TH |
933 | return mode & 3; |
934 | } | |
935 | ||
c3ef1500 TH |
936 | /** |
937 | * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members. | |
938 | * | |
939 | * @r: Pointer to "struct tomoyo_request_info" to initialize. | |
940 | * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain(). | |
57c2590f | 941 | * @index: Index number of functionality. |
c3ef1500 TH |
942 | * |
943 | * Returns mode. | |
944 | */ | |
945 | int tomoyo_init_request_info(struct tomoyo_request_info *r, | |
57c2590f | 946 | struct tomoyo_domain_info *domain, const u8 index) |
c3ef1500 | 947 | { |
57c2590f | 948 | u8 profile; |
c3ef1500 TH |
949 | memset(r, 0, sizeof(*r)); |
950 | if (!domain) | |
951 | domain = tomoyo_domain(); | |
952 | r->domain = domain; | |
57c2590f TH |
953 | profile = domain->profile; |
954 | r->profile = profile; | |
955 | r->type = index; | |
bd03a3e4 | 956 | r->mode = tomoyo_get_mode(domain->ns, profile, index); |
c3ef1500 TH |
957 | return r->mode; |
958 | } | |
959 | ||
c3ef1500 TH |
960 | /** |
961 | * tomoyo_domain_quota_is_ok - Check for domain's quota. | |
962 | * | |
963 | * @r: Pointer to "struct tomoyo_request_info". | |
964 | * | |
965 | * Returns true if the domain is not exceeded quota, false otherwise. | |
966 | * | |
967 | * Caller holds tomoyo_read_lock(). | |
968 | */ | |
969 | bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r) | |
970 | { | |
971 | unsigned int count = 0; | |
972 | struct tomoyo_domain_info *domain = r->domain; | |
973 | struct tomoyo_acl_info *ptr; | |
974 | ||
975 | if (r->mode != TOMOYO_CONFIG_LEARNING) | |
976 | return false; | |
977 | if (!domain) | |
978 | return true; | |
979 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
7c75964f TH |
980 | u16 perm; |
981 | u8 i; | |
7e3d199a | 982 | if (ptr->is_deleted) |
237ab459 | 983 | continue; |
c3ef1500 | 984 | switch (ptr->type) { |
c3ef1500 TH |
985 | case TOMOYO_TYPE_PATH_ACL: |
986 | perm = container_of(ptr, struct tomoyo_path_acl, head) | |
987 | ->perm; | |
c3ef1500 TH |
988 | break; |
989 | case TOMOYO_TYPE_PATH2_ACL: | |
990 | perm = container_of(ptr, struct tomoyo_path2_acl, head) | |
991 | ->perm; | |
c3ef1500 TH |
992 | break; |
993 | case TOMOYO_TYPE_PATH_NUMBER_ACL: | |
994 | perm = container_of(ptr, struct tomoyo_path_number_acl, | |
995 | head)->perm; | |
c3ef1500 | 996 | break; |
75093152 TH |
997 | case TOMOYO_TYPE_MKDEV_ACL: |
998 | perm = container_of(ptr, struct tomoyo_mkdev_acl, | |
c3ef1500 | 999 | head)->perm; |
c3ef1500 | 1000 | break; |
237ab459 | 1001 | default: |
7c75964f | 1002 | perm = 1; |
c3ef1500 | 1003 | } |
7c75964f TH |
1004 | for (i = 0; i < 16; i++) |
1005 | if (perm & (1 << i)) | |
1006 | count++; | |
c3ef1500 | 1007 | } |
bd03a3e4 | 1008 | if (count < tomoyo_profile(domain->ns, domain->profile)-> |
d5ca1725 | 1009 | pref[TOMOYO_PREF_MAX_LEARNING_ENTRY]) |
c3ef1500 | 1010 | return true; |
2c47ab93 TH |
1011 | if (!domain->flags[TOMOYO_DIF_QUOTA_WARNED]) { |
1012 | domain->flags[TOMOYO_DIF_QUOTA_WARNED] = true; | |
1013 | /* r->granted = false; */ | |
1014 | tomoyo_write_log(r, "%s", tomoyo_dif[TOMOYO_DIF_QUOTA_WARNED]); | |
1015 | printk(KERN_WARNING "WARNING: " | |
d5ca1725 | 1016 | "Domain '%s' has too many ACLs to hold. " |
c3ef1500 TH |
1017 | "Stopped learning mode.\n", domain->domainname->name); |
1018 | } | |
1019 | return false; | |
1020 | } |