1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * security/tomoyo/util.c
4 *
5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
6 */
7
8 #include <linux/slab.h>
9 #include <linux/rculist.h>
10
11 #include "common.h"
12
13 /* Lock for protecting policy. */
14 DEFINE_MUTEX(tomoyo_policy_lock);
15
16 /* Has /sbin/init started? */
17 bool tomoyo_policy_loaded;
18
19 /*
20 * Mapping table from "enum tomoyo_mac_index" to
21 * "enum tomoyo_mac_category_index".
22 */
23 const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX] = {
24 /* CONFIG::file group */
25 [TOMOYO_MAC_FILE_EXECUTE] = TOMOYO_MAC_CATEGORY_FILE,
26 [TOMOYO_MAC_FILE_OPEN] = TOMOYO_MAC_CATEGORY_FILE,
27 [TOMOYO_MAC_FILE_CREATE] = TOMOYO_MAC_CATEGORY_FILE,
28 [TOMOYO_MAC_FILE_UNLINK] = TOMOYO_MAC_CATEGORY_FILE,
29 [TOMOYO_MAC_FILE_GETATTR] = TOMOYO_MAC_CATEGORY_FILE,
30 [TOMOYO_MAC_FILE_MKDIR] = TOMOYO_MAC_CATEGORY_FILE,
31 [TOMOYO_MAC_FILE_RMDIR] = TOMOYO_MAC_CATEGORY_FILE,
32 [TOMOYO_MAC_FILE_MKFIFO] = TOMOYO_MAC_CATEGORY_FILE,
33 [TOMOYO_MAC_FILE_MKSOCK] = TOMOYO_MAC_CATEGORY_FILE,
34 [TOMOYO_MAC_FILE_TRUNCATE] = TOMOYO_MAC_CATEGORY_FILE,
35 [TOMOYO_MAC_FILE_SYMLINK] = TOMOYO_MAC_CATEGORY_FILE,
36 [TOMOYO_MAC_FILE_MKBLOCK] = TOMOYO_MAC_CATEGORY_FILE,
37 [TOMOYO_MAC_FILE_MKCHAR] = TOMOYO_MAC_CATEGORY_FILE,
38 [TOMOYO_MAC_FILE_LINK] = TOMOYO_MAC_CATEGORY_FILE,
39 [TOMOYO_MAC_FILE_RENAME] = TOMOYO_MAC_CATEGORY_FILE,
40 [TOMOYO_MAC_FILE_CHMOD] = TOMOYO_MAC_CATEGORY_FILE,
41 [TOMOYO_MAC_FILE_CHOWN] = TOMOYO_MAC_CATEGORY_FILE,
42 [TOMOYO_MAC_FILE_CHGRP] = TOMOYO_MAC_CATEGORY_FILE,
43 [TOMOYO_MAC_FILE_IOCTL] = TOMOYO_MAC_CATEGORY_FILE,
44 [TOMOYO_MAC_FILE_CHROOT] = TOMOYO_MAC_CATEGORY_FILE,
45 [TOMOYO_MAC_FILE_MOUNT] = TOMOYO_MAC_CATEGORY_FILE,
46 [TOMOYO_MAC_FILE_UMOUNT] = TOMOYO_MAC_CATEGORY_FILE,
47 [TOMOYO_MAC_FILE_PIVOT_ROOT] = TOMOYO_MAC_CATEGORY_FILE,
48 /* CONFIG::network group */
49 [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] =
50 TOMOYO_MAC_CATEGORY_NETWORK,
51 [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] =
52 TOMOYO_MAC_CATEGORY_NETWORK,
53 [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] =
54 TOMOYO_MAC_CATEGORY_NETWORK,
55 [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] =
56 TOMOYO_MAC_CATEGORY_NETWORK,
57 [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] =
58 TOMOYO_MAC_CATEGORY_NETWORK,
59 [TOMOYO_MAC_NETWORK_INET_RAW_BIND] =
60 TOMOYO_MAC_CATEGORY_NETWORK,
61 [TOMOYO_MAC_NETWORK_INET_RAW_SEND] =
62 TOMOYO_MAC_CATEGORY_NETWORK,
63 [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] =
64 TOMOYO_MAC_CATEGORY_NETWORK,
65 [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] =
66 TOMOYO_MAC_CATEGORY_NETWORK,
67 [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] =
68 TOMOYO_MAC_CATEGORY_NETWORK,
69 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] =
70 TOMOYO_MAC_CATEGORY_NETWORK,
71 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] =
72 TOMOYO_MAC_CATEGORY_NETWORK,
73 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] =
74 TOMOYO_MAC_CATEGORY_NETWORK,
75 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] =
76 TOMOYO_MAC_CATEGORY_NETWORK,
77 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] =
78 TOMOYO_MAC_CATEGORY_NETWORK,
79 /* CONFIG::misc group */
80 [TOMOYO_MAC_ENVIRON] = TOMOYO_MAC_CATEGORY_MISC,
81 };
82
83 /**
84 * tomoyo_convert_time - Convert time_t to YYYY/MM/DD hh/mm/ss.
85 *
86 * @time: Seconds since 1970/01/01 00:00:00.
87 * @stamp: Pointer to "struct tomoyo_time".
88 *
89 * Returns nothing.
90 *
91 * This function does not handle Y2038 problem.
92 */
tomoyo_convert_time(time_t time,struct tomoyo_time * stamp)93 void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp)
94 {
95 static const u16 tomoyo_eom[2][12] = {
96 { 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
97 { 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
98 };
99 u16 y;
100 u8 m;
101 bool r;
102 stamp->sec = time % 60;
103 time /= 60;
104 stamp->min = time % 60;
105 time /= 60;
106 stamp->hour = time % 24;
107 time /= 24;
108 for (y = 1970; ; y++) {
109 const unsigned short days = (y & 3) ? 365 : 366;
110 if (time < days)
111 break;
112 time -= days;
113 }
114 r = (y & 3) == 0;
115 for (m = 0; m < 11 && time >= tomoyo_eom[r][m]; m++)
116 ;
117 if (m)
118 time -= tomoyo_eom[r][m - 1];
119 stamp->year = y;
120 stamp->month = ++m;
121 stamp->day = ++time;
122 }
123
124 /**
125 * tomoyo_permstr - Find permission keywords.
126 *
127 * @string: String representation for permissions in foo/bar/buz format.
128 * @keyword: Keyword to find from @string/
129 *
130 * Returns ture if @keyword was found in @string, false otherwise.
131 *
132 * This function assumes that strncmp(w1, w2, strlen(w1)) != 0 if w1 != w2.
133 */
tomoyo_permstr(const char * string,const char * keyword)134 bool tomoyo_permstr(const char *string, const char *keyword)
135 {
136 const char *cp = strstr(string, keyword);
137 if (cp)
138 return cp == string || *(cp - 1) == '/';
139 return false;
140 }
141
142 /**
143 * tomoyo_read_token - Read a word from a line.
144 *
145 * @param: Pointer to "struct tomoyo_acl_param".
146 *
147 * Returns a word on success, "" otherwise.
148 *
149 * To allow the caller to skip NULL check, this function returns "" rather than
150 * NULL if there is no more words to read.
151 */
tomoyo_read_token(struct tomoyo_acl_param * param)152 char *tomoyo_read_token(struct tomoyo_acl_param *param)
153 {
154 char *pos = param->data;
155 char *del = strchr(pos, ' ');
156 if (del)
157 *del++ = '\0';
158 else
159 del = pos + strlen(pos);
160 param->data = del;
161 return pos;
162 }
163
164 /**
165 * tomoyo_get_domainname - Read a domainname from a line.
166 *
167 * @param: Pointer to "struct tomoyo_acl_param".
168 *
169 * Returns a domainname on success, NULL otherwise.
170 */
tomoyo_get_domainname(struct tomoyo_acl_param * param)171 const struct tomoyo_path_info *tomoyo_get_domainname
172 (struct tomoyo_acl_param *param)
173 {
174 char *start = param->data;
175 char *pos = start;
176 while (*pos) {
177 if (*pos++ != ' ' || *pos++ == '/')
178 continue;
179 pos -= 2;
180 *pos++ = '\0';
181 break;
182 }
183 param->data = pos;
184 if (tomoyo_correct_domain(start))
185 return tomoyo_get_name(start);
186 return NULL;
187 }
188
189 /**
190 * tomoyo_parse_ulong - Parse an "unsigned long" value.
191 *
192 * @result: Pointer to "unsigned long".
193 * @str: Pointer to string to parse.
194 *
195 * Returns one of values in "enum tomoyo_value_type".
196 *
197 * The @src is updated to point the first character after the value
198 * on success.
199 */
tomoyo_parse_ulong(unsigned long * result,char ** str)200 u8 tomoyo_parse_ulong(unsigned long *result, char **str)
201 {
202 const char *cp = *str;
203 char *ep;
204 int base = 10;
205 if (*cp == '0') {
206 char c = *(cp + 1);
207 if (c == 'x' || c == 'X') {
208 base = 16;
209 cp += 2;
210 } else if (c >= '0' && c <= '7') {
211 base = 8;
212 cp++;
213 }
214 }
215 *result = simple_strtoul(cp, &ep, base);
216 if (cp == ep)
217 return TOMOYO_VALUE_TYPE_INVALID;
218 *str = ep;
219 switch (base) {
220 case 16:
221 return TOMOYO_VALUE_TYPE_HEXADECIMAL;
222 case 8:
223 return TOMOYO_VALUE_TYPE_OCTAL;
224 default:
225 return TOMOYO_VALUE_TYPE_DECIMAL;
226 }
227 }
228
229 /**
230 * tomoyo_print_ulong - Print an "unsigned long" value.
231 *
232 * @buffer: Pointer to buffer.
233 * @buffer_len: Size of @buffer.
234 * @value: An "unsigned long" value.
235 * @type: Type of @value.
236 *
237 * Returns nothing.
238 */
tomoyo_print_ulong(char * buffer,const int buffer_len,const unsigned long value,const u8 type)239 void tomoyo_print_ulong(char *buffer, const int buffer_len,
240 const unsigned long value, const u8 type)
241 {
242 if (type == TOMOYO_VALUE_TYPE_DECIMAL)
243 snprintf(buffer, buffer_len, "%lu", value);
244 else if (type == TOMOYO_VALUE_TYPE_OCTAL)
245 snprintf(buffer, buffer_len, "0%lo", value);
246 else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
247 snprintf(buffer, buffer_len, "0x%lX", value);
248 else
249 snprintf(buffer, buffer_len, "type(%u)", type);
250 }
251
252 /**
253 * tomoyo_parse_name_union - Parse a tomoyo_name_union.
254 *
255 * @param: Pointer to "struct tomoyo_acl_param".
256 * @ptr: Pointer to "struct tomoyo_name_union".
257 *
258 * Returns true on success, false otherwise.
259 */
tomoyo_parse_name_union(struct tomoyo_acl_param * param,struct tomoyo_name_union * ptr)260 bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
261 struct tomoyo_name_union *ptr)
262 {
263 char *filename;
264 if (param->data[0] == '@') {
265 param->data++;
266 ptr->group = tomoyo_get_group(param, TOMOYO_PATH_GROUP);
267 return ptr->group != NULL;
268 }
269 filename = tomoyo_read_token(param);
270 if (!tomoyo_correct_word(filename))
271 return false;
272 ptr->filename = tomoyo_get_name(filename);
273 return ptr->filename != NULL;
274 }
275
276 /**
277 * tomoyo_parse_number_union - Parse a tomoyo_number_union.
278 *
279 * @param: Pointer to "struct tomoyo_acl_param".
280 * @ptr: Pointer to "struct tomoyo_number_union".
281 *
282 * Returns true on success, false otherwise.
283 */
tomoyo_parse_number_union(struct tomoyo_acl_param * param,struct tomoyo_number_union * ptr)284 bool tomoyo_parse_number_union(struct tomoyo_acl_param *param,
285 struct tomoyo_number_union *ptr)
286 {
287 char *data;
288 u8 type;
289 unsigned long v;
290 memset(ptr, 0, sizeof(*ptr));
291 if (param->data[0] == '@') {
292 param->data++;
293 ptr->group = tomoyo_get_group(param, TOMOYO_NUMBER_GROUP);
294 return ptr->group != NULL;
295 }
296 data = tomoyo_read_token(param);
297 type = tomoyo_parse_ulong(&v, &data);
298 if (type == TOMOYO_VALUE_TYPE_INVALID)
299 return false;
300 ptr->values[0] = v;
301 ptr->value_type[0] = type;
302 if (!*data) {
303 ptr->values[1] = v;
304 ptr->value_type[1] = type;
305 return true;
306 }
307 if (*data++ != '-')
308 return false;
309 type = tomoyo_parse_ulong(&v, &data);
310 if (type == TOMOYO_VALUE_TYPE_INVALID || *data || ptr->values[0] > v)
311 return false;
312 ptr->values[1] = v;
313 ptr->value_type[1] = type;
314 return true;
315 }
316
317 /**
318 * tomoyo_byte_range - Check whether the string is a \ooo style octal value.
319 *
320 * @str: Pointer to the string.
321 *
322 * Returns true if @str is a \ooo style octal value, false otherwise.
323 *
324 * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
325 * This function verifies that \ooo is in valid range.
326 */
tomoyo_byte_range(const char * str)327 static inline bool tomoyo_byte_range(const char *str)
328 {
329 return *str >= '0' && *str++ <= '3' &&
330 *str >= '0' && *str++ <= '7' &&
331 *str >= '0' && *str <= '7';
332 }
333
334 /**
335 * tomoyo_alphabet_char - Check whether the character is an alphabet.
336 *
337 * @c: The character to check.
338 *
339 * Returns true if @c is an alphabet character, false otherwise.
340 */
tomoyo_alphabet_char(const char c)341 static inline bool tomoyo_alphabet_char(const char c)
342 {
343 return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
344 }
345
346 /**
347 * tomoyo_make_byte - Make byte value from three octal characters.
348 *
349 * @c1: The first character.
350 * @c2: The second character.
351 * @c3: The third character.
352 *
353 * Returns byte value.
354 */
tomoyo_make_byte(const u8 c1,const u8 c2,const u8 c3)355 static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
356 {
357 return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
358 }
359
360 /**
361 * tomoyo_valid - Check whether the character is a valid char.
362 *
363 * @c: The character to check.
364 *
365 * Returns true if @c is a valid character, false otherwise.
366 */
tomoyo_valid(const unsigned char c)367 static inline bool tomoyo_valid(const unsigned char c)
368 {
369 return c > ' ' && c < 127;
370 }
371
372 /**
373 * tomoyo_invalid - Check whether the character is an invalid char.
374 *
375 * @c: The character to check.
376 *
377 * Returns true if @c is an invalid character, false otherwise.
378 */
tomoyo_invalid(const unsigned char c)379 static inline bool tomoyo_invalid(const unsigned char c)
380 {
381 return c && (c <= ' ' || c >= 127);
382 }
383
384 /**
385 * tomoyo_str_starts - Check whether the given string starts with the given keyword.
386 *
387 * @src: Pointer to pointer to the string.
388 * @find: Pointer to the keyword.
389 *
390 * Returns true if @src starts with @find, false otherwise.
391 *
392 * The @src is updated to point the first character after the @find
393 * if @src starts with @find.
394 */
tomoyo_str_starts(char ** src,const char * find)395 bool tomoyo_str_starts(char **src, const char *find)
396 {
397 const int len = strlen(find);
398 char *tmp = *src;
399
400 if (strncmp(tmp, find, len))
401 return false;
402 tmp += len;
403 *src = tmp;
404 return true;
405 }
406
407 /**
408 * tomoyo_normalize_line - Format string.
409 *
410 * @buffer: The line to normalize.
411 *
412 * Leading and trailing whitespaces are removed.
413 * Multiple whitespaces are packed into single space.
414 *
415 * Returns nothing.
416 */
tomoyo_normalize_line(unsigned char * buffer)417 void tomoyo_normalize_line(unsigned char *buffer)
418 {
419 unsigned char *sp = buffer;
420 unsigned char *dp = buffer;
421 bool first = true;
422
423 while (tomoyo_invalid(*sp))
424 sp++;
425 while (*sp) {
426 if (!first)
427 *dp++ = ' ';
428 first = false;
429 while (tomoyo_valid(*sp))
430 *dp++ = *sp++;
431 while (tomoyo_invalid(*sp))
432 sp++;
433 }
434 *dp = '\0';
435 }
436
437 /**
438 * tomoyo_correct_word2 - Validate a string.
439 *
440 * @string: The string to check. Maybe non-'\0'-terminated.
441 * @len: Length of @string.
442 *
443 * Check whether the given string follows the naming rules.
444 * Returns true if @string follows the naming rules, false otherwise.
445 */
tomoyo_correct_word2(const char * string,size_t len)446 static bool tomoyo_correct_word2(const char *string, size_t len)
447 {
448 const char *const start = string;
449 bool in_repetition = false;
450 unsigned char c;
451 unsigned char d;
452 unsigned char e;
453 if (!len)
454 goto out;
455 while (len--) {
456 c = *string++;
457 if (c == '\\') {
458 if (!len--)
459 goto out;
460 c = *string++;
461 switch (c) {
462 case '\\': /* "\\" */
463 continue;
464 case '$': /* "\$" */
465 case '+': /* "\+" */
466 case '?': /* "\?" */
467 case '*': /* "\*" */
468 case '@': /* "\@" */
469 case 'x': /* "\x" */
470 case 'X': /* "\X" */
471 case 'a': /* "\a" */
472 case 'A': /* "\A" */
473 case '-': /* "\-" */
474 continue;
475 case '{': /* "/\{" */
476 if (string - 3 < start || *(string - 3) != '/')
477 break;
478 in_repetition = true;
479 continue;
480 case '}': /* "\}/" */
481 if (*string != '/')
482 break;
483 if (!in_repetition)
484 break;
485 in_repetition = false;
486 continue;
487 case '0': /* "\ooo" */
488 case '1':
489 case '2':
490 case '3':
491 if (!len-- || !len--)
492 break;
493 d = *string++;
494 e = *string++;
495 if (d < '0' || d > '7' || e < '0' || e > '7')
496 break;
497 c = tomoyo_make_byte(c, d, e);
498 if (c <= ' ' || c >= 127)
499 continue;
500 }
501 goto out;
502 } else if (in_repetition && c == '/') {
503 goto out;
504 } else if (c <= ' ' || c >= 127) {
505 goto out;
506 }
507 }
508 if (in_repetition)
509 goto out;
510 return true;
511 out:
512 return false;
513 }
514
515 /**
516 * tomoyo_correct_word - Validate a string.
517 *
518 * @string: The string to check.
519 *
520 * Check whether the given string follows the naming rules.
521 * Returns true if @string follows the naming rules, false otherwise.
522 */
tomoyo_correct_word(const char * string)523 bool tomoyo_correct_word(const char *string)
524 {
525 return tomoyo_correct_word2(string, strlen(string));
526 }
527
528 /**
529 * tomoyo_correct_path - Validate a pathname.
530 *
531 * @filename: The pathname to check.
532 *
533 * Check whether the given pathname follows the naming rules.
534 * Returns true if @filename follows the naming rules, false otherwise.
535 */
tomoyo_correct_path(const char * filename)536 bool tomoyo_correct_path(const char *filename)
537 {
538 return *filename == '/' && tomoyo_correct_word(filename);
539 }
540
541 /**
542 * tomoyo_correct_domain - Check whether the given domainname follows the naming rules.
543 *
544 * @domainname: The domainname to check.
545 *
546 * Returns true if @domainname follows the naming rules, false otherwise.
547 */
tomoyo_correct_domain(const unsigned char * domainname)548 bool tomoyo_correct_domain(const unsigned char *domainname)
549 {
550 if (!domainname || !tomoyo_domain_def(domainname))
551 return false;
552 domainname = strchr(domainname, ' ');
553 if (!domainname++)
554 return true;
555 while (1) {
556 const unsigned char *cp = strchr(domainname, ' ');
557 if (!cp)
558 break;
559 if (*domainname != '/' ||
560 !tomoyo_correct_word2(domainname, cp - domainname))
561 return false;
562 domainname = cp + 1;
563 }
564 return tomoyo_correct_path(domainname);
565 }
566
567 /**
568 * tomoyo_domain_def - Check whether the given token can be a domainname.
569 *
570 * @buffer: The token to check.
571 *
572 * Returns true if @buffer possibly be a domainname, false otherwise.
573 */
tomoyo_domain_def(const unsigned char * buffer)574 bool tomoyo_domain_def(const unsigned char *buffer)
575 {
576 const unsigned char *cp;
577 int len;
578 if (*buffer != '<')
579 return false;
580 cp = strchr(buffer, ' ');
581 if (!cp)
582 len = strlen(buffer);
583 else
584 len = cp - buffer;
585 if (buffer[len - 1] != '>' ||
586 !tomoyo_correct_word2(buffer + 1, len - 2))
587 return false;
588 return true;
589 }
590
591 /**
592 * tomoyo_find_domain - Find a domain by the given name.
593 *
594 * @domainname: The domainname to find.
595 *
596 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
597 *
598 * Caller holds tomoyo_read_lock().
599 */
tomoyo_find_domain(const char * domainname)600 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
601 {
602 struct tomoyo_domain_info *domain;
603 struct tomoyo_path_info name;
604
605 name.name = domainname;
606 tomoyo_fill_path_info(&name);
607 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
608 if (!domain->is_deleted &&
609 !tomoyo_pathcmp(&name, domain->domainname))
610 return domain;
611 }
612 return NULL;
613 }
614
615 /**
616 * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
617 *
618 * @filename: The string to evaluate.
619 *
620 * Returns the initial length without a pattern in @filename.
621 */
tomoyo_const_part_length(const char * filename)622 static int tomoyo_const_part_length(const char *filename)
623 {
624 char c;
625 int len = 0;
626
627 if (!filename)
628 return 0;
629 while ((c = *filename++) != '\0') {
630 if (c != '\\') {
631 len++;
632 continue;
633 }
634 c = *filename++;
635 switch (c) {
636 case '\\': /* "\\" */
637 len += 2;
638 continue;
639 case '0': /* "\ooo" */
640 case '1':
641 case '2':
642 case '3':
643 c = *filename++;
644 if (c < '0' || c > '7')
645 break;
646 c = *filename++;
647 if (c < '0' || c > '7')
648 break;
649 len += 4;
650 continue;
651 }
652 break;
653 }
654 return len;
655 }
656
657 /**
658 * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
659 *
660 * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
661 *
662 * The caller sets "struct tomoyo_path_info"->name.
663 */
tomoyo_fill_path_info(struct tomoyo_path_info * ptr)664 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
665 {
666 const char *name = ptr->name;
667 const int len = strlen(name);
668
669 ptr->const_len = tomoyo_const_part_length(name);
670 ptr->is_dir = len && (name[len - 1] == '/');
671 ptr->is_patterned = (ptr->const_len < len);
672 ptr->hash = full_name_hash(NULL, name, len);
673 }
674
675 /**
676 * tomoyo_file_matches_pattern2 - Pattern matching without '/' character and "\-" pattern.
677 *
678 * @filename: The start of string to check.
679 * @filename_end: The end of string to check.
680 * @pattern: The start of pattern to compare.
681 * @pattern_end: The end of pattern to compare.
682 *
683 * Returns true if @filename matches @pattern, false otherwise.
684 */
tomoyo_file_matches_pattern2(const char * filename,const char * filename_end,const char * pattern,const char * pattern_end)685 static bool tomoyo_file_matches_pattern2(const char *filename,
686 const char *filename_end,
687 const char *pattern,
688 const char *pattern_end)
689 {
690 while (filename < filename_end && pattern < pattern_end) {
691 char c;
692 if (*pattern != '\\') {
693 if (*filename++ != *pattern++)
694 return false;
695 continue;
696 }
697 c = *filename;
698 pattern++;
699 switch (*pattern) {
700 int i;
701 int j;
702 case '?':
703 if (c == '/') {
704 return false;
705 } else if (c == '\\') {
706 if (filename[1] == '\\')
707 filename++;
708 else if (tomoyo_byte_range(filename + 1))
709 filename += 3;
710 else
711 return false;
712 }
713 break;
714 case '\\':
715 if (c != '\\')
716 return false;
717 if (*++filename != '\\')
718 return false;
719 break;
720 case '+':
721 if (!isdigit(c))
722 return false;
723 break;
724 case 'x':
725 if (!isxdigit(c))
726 return false;
727 break;
728 case 'a':
729 if (!tomoyo_alphabet_char(c))
730 return false;
731 break;
732 case '0':
733 case '1':
734 case '2':
735 case '3':
736 if (c == '\\' && tomoyo_byte_range(filename + 1)
737 && strncmp(filename + 1, pattern, 3) == 0) {
738 filename += 3;
739 pattern += 2;
740 break;
741 }
742 return false; /* Not matched. */
743 case '*':
744 case '@':
745 for (i = 0; i <= filename_end - filename; i++) {
746 if (tomoyo_file_matches_pattern2(
747 filename + i, filename_end,
748 pattern + 1, pattern_end))
749 return true;
750 c = filename[i];
751 if (c == '.' && *pattern == '@')
752 break;
753 if (c != '\\')
754 continue;
755 if (filename[i + 1] == '\\')
756 i++;
757 else if (tomoyo_byte_range(filename + i + 1))
758 i += 3;
759 else
760 break; /* Bad pattern. */
761 }
762 return false; /* Not matched. */
763 default:
764 j = 0;
765 c = *pattern;
766 if (c == '$') {
767 while (isdigit(filename[j]))
768 j++;
769 } else if (c == 'X') {
770 while (isxdigit(filename[j]))
771 j++;
772 } else if (c == 'A') {
773 while (tomoyo_alphabet_char(filename[j]))
774 j++;
775 }
776 for (i = 1; i <= j; i++) {
777 if (tomoyo_file_matches_pattern2(
778 filename + i, filename_end,
779 pattern + 1, pattern_end))
780 return true;
781 }
782 return false; /* Not matched or bad pattern. */
783 }
784 filename++;
785 pattern++;
786 }
787 while (*pattern == '\\' &&
788 (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
789 pattern += 2;
790 return filename == filename_end && pattern == pattern_end;
791 }
792
793 /**
794 * tomoyo_file_matches_pattern - Pattern matching without '/' character.
795 *
796 * @filename: The start of string to check.
797 * @filename_end: The end of string to check.
798 * @pattern: The start of pattern to compare.
799 * @pattern_end: The end of pattern to compare.
800 *
801 * Returns true if @filename matches @pattern, false otherwise.
802 */
tomoyo_file_matches_pattern(const char * filename,const char * filename_end,const char * pattern,const char * pattern_end)803 static bool tomoyo_file_matches_pattern(const char *filename,
804 const char *filename_end,
805 const char *pattern,
806 const char *pattern_end)
807 {
808 const char *pattern_start = pattern;
809 bool first = true;
810 bool result;
811
812 while (pattern < pattern_end - 1) {
813 /* Split at "\-" pattern. */
814 if (*pattern++ != '\\' || *pattern++ != '-')
815 continue;
816 result = tomoyo_file_matches_pattern2(filename,
817 filename_end,
818 pattern_start,
819 pattern - 2);
820 if (first)
821 result = !result;
822 if (result)
823 return false;
824 first = false;
825 pattern_start = pattern;
826 }
827 result = tomoyo_file_matches_pattern2(filename, filename_end,
828 pattern_start, pattern_end);
829 return first ? result : !result;
830 }
831
832 /**
833 * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
834 *
835 * @f: The start of string to check.
836 * @p: The start of pattern to compare.
837 *
838 * Returns true if @f matches @p, false otherwise.
839 */
tomoyo_path_matches_pattern2(const char * f,const char * p)840 static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
841 {
842 const char *f_delimiter;
843 const char *p_delimiter;
844
845 while (*f && *p) {
846 f_delimiter = strchr(f, '/');
847 if (!f_delimiter)
848 f_delimiter = f + strlen(f);
849 p_delimiter = strchr(p, '/');
850 if (!p_delimiter)
851 p_delimiter = p + strlen(p);
852 if (*p == '\\' && *(p + 1) == '{')
853 goto recursive;
854 if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
855 p_delimiter))
856 return false;
857 f = f_delimiter;
858 if (*f)
859 f++;
860 p = p_delimiter;
861 if (*p)
862 p++;
863 }
864 /* Ignore trailing "\*" and "\@" in @pattern. */
865 while (*p == '\\' &&
866 (*(p + 1) == '*' || *(p + 1) == '@'))
867 p += 2;
868 return !*f && !*p;
869 recursive:
870 /*
871 * The "\{" pattern is permitted only after '/' character.
872 * This guarantees that below "*(p - 1)" is safe.
873 * Also, the "\}" pattern is permitted only before '/' character
874 * so that "\{" + "\}" pair will not break the "\-" operator.
875 */
876 if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
877 *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
878 return false; /* Bad pattern. */
879 do {
880 /* Compare current component with pattern. */
881 if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
882 p_delimiter - 2))
883 break;
884 /* Proceed to next component. */
885 f = f_delimiter;
886 if (!*f)
887 break;
888 f++;
889 /* Continue comparison. */
890 if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
891 return true;
892 f_delimiter = strchr(f, '/');
893 } while (f_delimiter);
894 return false; /* Not matched. */
895 }
896
897 /**
898 * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
899 *
900 * @filename: The filename to check.
901 * @pattern: The pattern to compare.
902 *
903 * Returns true if matches, false otherwise.
904 *
905 * The following patterns are available.
906 * \\ \ itself.
907 * \ooo Octal representation of a byte.
908 * \* Zero or more repetitions of characters other than '/'.
909 * \@ Zero or more repetitions of characters other than '/' or '.'.
910 * \? 1 byte character other than '/'.
911 * \$ One or more repetitions of decimal digits.
912 * \+ 1 decimal digit.
913 * \X One or more repetitions of hexadecimal digits.
914 * \x 1 hexadecimal digit.
915 * \A One or more repetitions of alphabet characters.
916 * \a 1 alphabet character.
917 *
918 * \- Subtraction operator.
919 *
920 * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
921 * /dir/dir/dir/ ).
922 */
tomoyo_path_matches_pattern(const struct tomoyo_path_info * filename,const struct tomoyo_path_info * pattern)923 bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
924 const struct tomoyo_path_info *pattern)
925 {
926 const char *f = filename->name;
927 const char *p = pattern->name;
928 const int len = pattern->const_len;
929
930 /* If @pattern doesn't contain pattern, I can use strcmp(). */
931 if (!pattern->is_patterned)
932 return !tomoyo_pathcmp(filename, pattern);
933 /* Don't compare directory and non-directory. */
934 if (filename->is_dir != pattern->is_dir)
935 return false;
936 /* Compare the initial length without patterns. */
937 if (strncmp(f, p, len))
938 return false;
939 f += len;
940 p += len;
941 return tomoyo_path_matches_pattern2(f, p);
942 }
943
944 /**
945 * tomoyo_get_exe - Get tomoyo_realpath() of current process.
946 *
947 * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
948 *
949 * This function uses kzalloc(), so the caller must call kfree()
950 * if this function didn't return NULL.
951 */
tomoyo_get_exe(void)952 const char *tomoyo_get_exe(void)
953 {
954 struct file *exe_file;
955 const char *cp;
956 struct mm_struct *mm = current->mm;
957
958 if (!mm)
959 return NULL;
960 exe_file = get_mm_exe_file(mm);
961 if (!exe_file)
962 return NULL;
963
964 cp = tomoyo_realpath_from_path(&exe_file->f_path);
965 fput(exe_file);
966 return cp;
967 }
968
969 /**
970 * tomoyo_get_mode - Get MAC mode.
971 *
972 * @ns: Pointer to "struct tomoyo_policy_namespace".
973 * @profile: Profile number.
974 * @index: Index number of functionality.
975 *
976 * Returns mode.
977 */
tomoyo_get_mode(const struct tomoyo_policy_namespace * ns,const u8 profile,const u8 index)978 int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
979 const u8 index)
980 {
981 u8 mode;
982 struct tomoyo_profile *p;
983
984 if (!tomoyo_policy_loaded)
985 return TOMOYO_CONFIG_DISABLED;
986 p = tomoyo_profile(ns, profile);
987 mode = p->config[index];
988 if (mode == TOMOYO_CONFIG_USE_DEFAULT)
989 mode = p->config[tomoyo_index2category[index]
990 + TOMOYO_MAX_MAC_INDEX];
991 if (mode == TOMOYO_CONFIG_USE_DEFAULT)
992 mode = p->default_config;
993 return mode & 3;
994 }
995
996 /**
997 * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members.
998 *
999 * @r: Pointer to "struct tomoyo_request_info" to initialize.
1000 * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain().
1001 * @index: Index number of functionality.
1002 *
1003 * Returns mode.
1004 */
tomoyo_init_request_info(struct tomoyo_request_info * r,struct tomoyo_domain_info * domain,const u8 index)1005 int tomoyo_init_request_info(struct tomoyo_request_info *r,
1006 struct tomoyo_domain_info *domain, const u8 index)
1007 {
1008 u8 profile;
1009 memset(r, 0, sizeof(*r));
1010 if (!domain)
1011 domain = tomoyo_domain();
1012 r->domain = domain;
1013 profile = domain->profile;
1014 r->profile = profile;
1015 r->type = index;
1016 r->mode = tomoyo_get_mode(domain->ns, profile, index);
1017 return r->mode;
1018 }
1019
1020 /**
1021 * tomoyo_domain_quota_is_ok - Check for domain's quota.
1022 *
1023 * @r: Pointer to "struct tomoyo_request_info".
1024 *
1025 * Returns true if the domain is not exceeded quota, false otherwise.
1026 *
1027 * Caller holds tomoyo_read_lock().
1028 */
tomoyo_domain_quota_is_ok(struct tomoyo_request_info * r)1029 bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
1030 {
1031 unsigned int count = 0;
1032 struct tomoyo_domain_info *domain = r->domain;
1033 struct tomoyo_acl_info *ptr;
1034
1035 if (r->mode != TOMOYO_CONFIG_LEARNING)
1036 return false;
1037 if (!domain)
1038 return true;
1039 list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
1040 u16 perm;
1041 u8 i;
1042 if (ptr->is_deleted)
1043 continue;
1044 switch (ptr->type) {
1045 case TOMOYO_TYPE_PATH_ACL:
1046 perm = container_of(ptr, struct tomoyo_path_acl, head)
1047 ->perm;
1048 break;
1049 case TOMOYO_TYPE_PATH2_ACL:
1050 perm = container_of(ptr, struct tomoyo_path2_acl, head)
1051 ->perm;
1052 break;
1053 case TOMOYO_TYPE_PATH_NUMBER_ACL:
1054 perm = container_of(ptr, struct tomoyo_path_number_acl,
1055 head)->perm;
1056 break;
1057 case TOMOYO_TYPE_MKDEV_ACL:
1058 perm = container_of(ptr, struct tomoyo_mkdev_acl,
1059 head)->perm;
1060 break;
1061 case TOMOYO_TYPE_INET_ACL:
1062 perm = container_of(ptr, struct tomoyo_inet_acl,
1063 head)->perm;
1064 break;
1065 case TOMOYO_TYPE_UNIX_ACL:
1066 perm = container_of(ptr, struct tomoyo_unix_acl,
1067 head)->perm;
1068 break;
1069 case TOMOYO_TYPE_MANUAL_TASK_ACL:
1070 perm = 0;
1071 break;
1072 default:
1073 perm = 1;
1074 }
1075 for (i = 0; i < 16; i++)
1076 if (perm & (1 << i))
1077 count++;
1078 }
1079 if (count < tomoyo_profile(domain->ns, domain->profile)->
1080 pref[TOMOYO_PREF_MAX_LEARNING_ENTRY])
1081 return true;
1082 if (!domain->flags[TOMOYO_DIF_QUOTA_WARNED]) {
1083 domain->flags[TOMOYO_DIF_QUOTA_WARNED] = true;
1084 /* r->granted = false; */
1085 tomoyo_write_log(r, "%s", tomoyo_dif[TOMOYO_DIF_QUOTA_WARNED]);
1086 printk(KERN_WARNING "WARNING: "
1087 "Domain '%s' has too many ACLs to hold. "
1088 "Stopped learning mode.\n", domain->domainname->name);
1089 }
1090 return false;
1091 }
1092