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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. */
14DEFINE_MUTEX(tomoyo_policy_lock);
15
16/* Has /sbin/init started? */
17bool tomoyo_policy_loaded;
18
19/*
20 * Mapping table from "enum tomoyo_mac_index" to
21 * "enum tomoyo_mac_category_index".
22 */
23const 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 */
91void tomoyo_convert_time(time64_t time64, struct tomoyo_time *stamp)
92{
93 struct tm tm;
94
95 time64_to_tm(time64, 0, &tm);
96 stamp->sec = tm.tm_sec;
97 stamp->min = tm.tm_min;
98 stamp->hour = tm.tm_hour;
99 stamp->day = tm.tm_mday;
100 stamp->month = tm.tm_mon + 1;
101 stamp->year = tm.tm_year + 1900;
102}
103
104/**
105 * tomoyo_permstr - Find permission keywords.
106 *
107 * @string: String representation for permissions in foo/bar/buz format.
108 * @keyword: Keyword to find from @string/
109 *
110 * Returns true if @keyword was found in @string, false otherwise.
111 *
112 * This function assumes that strncmp(w1, w2, strlen(w1)) != 0 if w1 != w2.
113 */
114bool tomoyo_permstr(const char *string, const char *keyword)
115{
116 const char *cp = strstr(string, keyword);
117
118 if (cp)
119 return cp == string || *(cp - 1) == '/';
120 return false;
121}
122
123/**
124 * tomoyo_read_token - Read a word from a line.
125 *
126 * @param: Pointer to "struct tomoyo_acl_param".
127 *
128 * Returns a word on success, "" otherwise.
129 *
130 * To allow the caller to skip NULL check, this function returns "" rather than
131 * NULL if there is no more words to read.
132 */
133char *tomoyo_read_token(struct tomoyo_acl_param *param)
134{
135 char *pos = param->data;
136 char *del = strchr(pos, ' ');
137
138 if (del)
139 *del++ = '\0';
140 else
141 del = pos + strlen(pos);
142 param->data = del;
143 return pos;
144}
145
146/**
147 * tomoyo_get_domainname - Read a domainname from a line.
148 *
149 * @param: Pointer to "struct tomoyo_acl_param".
150 *
151 * Returns a domainname on success, NULL otherwise.
152 */
153const struct tomoyo_path_info *tomoyo_get_domainname
154(struct tomoyo_acl_param *param)
155{
156 char *start = param->data;
157 char *pos = start;
158
159 while (*pos) {
160 if (*pos++ != ' ' || *pos++ == '/')
161 continue;
162 pos -= 2;
163 *pos++ = '\0';
164 break;
165 }
166 param->data = pos;
167 if (tomoyo_correct_domain(start))
168 return tomoyo_get_name(start);
169 return NULL;
170}
171
172/**
173 * tomoyo_parse_ulong - Parse an "unsigned long" value.
174 *
175 * @result: Pointer to "unsigned long".
176 * @str: Pointer to string to parse.
177 *
178 * Returns one of values in "enum tomoyo_value_type".
179 *
180 * The @src is updated to point the first character after the value
181 * on success.
182 */
183u8 tomoyo_parse_ulong(unsigned long *result, char **str)
184{
185 const char *cp = *str;
186 char *ep;
187 int base = 10;
188
189 if (*cp == '0') {
190 char c = *(cp + 1);
191
192 if (c == 'x' || c == 'X') {
193 base = 16;
194 cp += 2;
195 } else if (c >= '0' && c <= '7') {
196 base = 8;
197 cp++;
198 }
199 }
200 *result = simple_strtoul(cp, &ep, base);
201 if (cp == ep)
202 return TOMOYO_VALUE_TYPE_INVALID;
203 *str = ep;
204 switch (base) {
205 case 16:
206 return TOMOYO_VALUE_TYPE_HEXADECIMAL;
207 case 8:
208 return TOMOYO_VALUE_TYPE_OCTAL;
209 default:
210 return TOMOYO_VALUE_TYPE_DECIMAL;
211 }
212}
213
214/**
215 * tomoyo_print_ulong - Print an "unsigned long" value.
216 *
217 * @buffer: Pointer to buffer.
218 * @buffer_len: Size of @buffer.
219 * @value: An "unsigned long" value.
220 * @type: Type of @value.
221 *
222 * Returns nothing.
223 */
224void tomoyo_print_ulong(char *buffer, const int buffer_len,
225 const unsigned long value, const u8 type)
226{
227 if (type == TOMOYO_VALUE_TYPE_DECIMAL)
228 snprintf(buffer, buffer_len, "%lu", value);
229 else if (type == TOMOYO_VALUE_TYPE_OCTAL)
230 snprintf(buffer, buffer_len, "0%lo", value);
231 else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
232 snprintf(buffer, buffer_len, "0x%lX", value);
233 else
234 snprintf(buffer, buffer_len, "type(%u)", type);
235}
236
237/**
238 * tomoyo_parse_name_union - Parse a tomoyo_name_union.
239 *
240 * @param: Pointer to "struct tomoyo_acl_param".
241 * @ptr: Pointer to "struct tomoyo_name_union".
242 *
243 * Returns true on success, false otherwise.
244 */
245bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
246 struct tomoyo_name_union *ptr)
247{
248 char *filename;
249
250 if (param->data[0] == '@') {
251 param->data++;
252 ptr->group = tomoyo_get_group(param, TOMOYO_PATH_GROUP);
253 return ptr->group != NULL;
254 }
255 filename = tomoyo_read_token(param);
256 if (!tomoyo_correct_word(filename))
257 return false;
258 ptr->filename = tomoyo_get_name(filename);
259 return ptr->filename != NULL;
260}
261
262/**
263 * tomoyo_parse_number_union - Parse a tomoyo_number_union.
264 *
265 * @param: Pointer to "struct tomoyo_acl_param".
266 * @ptr: Pointer to "struct tomoyo_number_union".
267 *
268 * Returns true on success, false otherwise.
269 */
270bool tomoyo_parse_number_union(struct tomoyo_acl_param *param,
271 struct tomoyo_number_union *ptr)
272{
273 char *data;
274 u8 type;
275 unsigned long v;
276
277 memset(ptr, 0, sizeof(*ptr));
278 if (param->data[0] == '@') {
279 param->data++;
280 ptr->group = tomoyo_get_group(param, TOMOYO_NUMBER_GROUP);
281 return ptr->group != NULL;
282 }
283 data = tomoyo_read_token(param);
284 type = tomoyo_parse_ulong(&v, &data);
285 if (type == TOMOYO_VALUE_TYPE_INVALID)
286 return false;
287 ptr->values[0] = v;
288 ptr->value_type[0] = type;
289 if (!*data) {
290 ptr->values[1] = v;
291 ptr->value_type[1] = type;
292 return true;
293 }
294 if (*data++ != '-')
295 return false;
296 type = tomoyo_parse_ulong(&v, &data);
297 if (type == TOMOYO_VALUE_TYPE_INVALID || *data || ptr->values[0] > v)
298 return false;
299 ptr->values[1] = v;
300 ptr->value_type[1] = type;
301 return true;
302}
303
304/**
305 * tomoyo_byte_range - Check whether the string is a \ooo style octal value.
306 *
307 * @str: Pointer to the string.
308 *
309 * Returns true if @str is a \ooo style octal value, false otherwise.
310 *
311 * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
312 * This function verifies that \ooo is in valid range.
313 */
314static inline bool tomoyo_byte_range(const char *str)
315{
316 return *str >= '0' && *str++ <= '3' &&
317 *str >= '0' && *str++ <= '7' &&
318 *str >= '0' && *str <= '7';
319}
320
321/**
322 * tomoyo_alphabet_char - Check whether the character is an alphabet.
323 *
324 * @c: The character to check.
325 *
326 * Returns true if @c is an alphabet character, false otherwise.
327 */
328static inline bool tomoyo_alphabet_char(const char c)
329{
330 return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
331}
332
333/**
334 * tomoyo_make_byte - Make byte value from three octal characters.
335 *
336 * @c1: The first character.
337 * @c2: The second character.
338 * @c3: The third character.
339 *
340 * Returns byte value.
341 */
342static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
343{
344 return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
345}
346
347/**
348 * tomoyo_valid - Check whether the character is a valid char.
349 *
350 * @c: The character to check.
351 *
352 * Returns true if @c is a valid character, false otherwise.
353 */
354static inline bool tomoyo_valid(const unsigned char c)
355{
356 return c > ' ' && c < 127;
357}
358
359/**
360 * tomoyo_invalid - Check whether the character is an invalid char.
361 *
362 * @c: The character to check.
363 *
364 * Returns true if @c is an invalid character, false otherwise.
365 */
366static inline bool tomoyo_invalid(const unsigned char c)
367{
368 return c && (c <= ' ' || c >= 127);
369}
370
371/**
372 * tomoyo_str_starts - Check whether the given string starts with the given keyword.
373 *
374 * @src: Pointer to pointer to the string.
375 * @find: Pointer to the keyword.
376 *
377 * Returns true if @src starts with @find, false otherwise.
378 *
379 * The @src is updated to point the first character after the @find
380 * if @src starts with @find.
381 */
382bool tomoyo_str_starts(char **src, const char *find)
383{
384 const int len = strlen(find);
385 char *tmp = *src;
386
387 if (strncmp(tmp, find, len))
388 return false;
389 tmp += len;
390 *src = tmp;
391 return true;
392}
393
394/**
395 * tomoyo_normalize_line - Format string.
396 *
397 * @buffer: The line to normalize.
398 *
399 * Leading and trailing whitespaces are removed.
400 * Multiple whitespaces are packed into single space.
401 *
402 * Returns nothing.
403 */
404void tomoyo_normalize_line(unsigned char *buffer)
405{
406 unsigned char *sp = buffer;
407 unsigned char *dp = buffer;
408 bool first = true;
409
410 while (tomoyo_invalid(*sp))
411 sp++;
412 while (*sp) {
413 if (!first)
414 *dp++ = ' ';
415 first = false;
416 while (tomoyo_valid(*sp))
417 *dp++ = *sp++;
418 while (tomoyo_invalid(*sp))
419 sp++;
420 }
421 *dp = '\0';
422}
423
424/**
425 * tomoyo_correct_word2 - Validate a string.
426 *
427 * @string: The string to check. Maybe non-'\0'-terminated.
428 * @len: Length of @string.
429 *
430 * Check whether the given string follows the naming rules.
431 * Returns true if @string follows the naming rules, false otherwise.
432 */
433static bool tomoyo_correct_word2(const char *string, size_t len)
434{
435 const char *const start = string;
436 bool in_repetition = false;
437 unsigned char c;
438 unsigned char d;
439 unsigned char e;
440
441 if (!len)
442 goto out;
443 while (len--) {
444 c = *string++;
445 if (c == '\\') {
446 if (!len--)
447 goto out;
448 c = *string++;
449 switch (c) {
450 case '\\': /* "\\" */
451 continue;
452 case '$': /* "\$" */
453 case '+': /* "\+" */
454 case '?': /* "\?" */
455 case '*': /* "\*" */
456 case '@': /* "\@" */
457 case 'x': /* "\x" */
458 case 'X': /* "\X" */
459 case 'a': /* "\a" */
460 case 'A': /* "\A" */
461 case '-': /* "\-" */
462 continue;
463 case '{': /* "/\{" */
464 if (string - 3 < start || *(string - 3) != '/')
465 break;
466 in_repetition = true;
467 continue;
468 case '}': /* "\}/" */
469 if (*string != '/')
470 break;
471 if (!in_repetition)
472 break;
473 in_repetition = false;
474 continue;
475 case '0': /* "\ooo" */
476 case '1':
477 case '2':
478 case '3':
479 if (!len-- || !len--)
480 break;
481 d = *string++;
482 e = *string++;
483 if (d < '0' || d > '7' || e < '0' || e > '7')
484 break;
485 c = tomoyo_make_byte(c, d, e);
486 if (c <= ' ' || c >= 127)
487 continue;
488 }
489 goto out;
490 } else if (in_repetition && c == '/') {
491 goto out;
492 } else if (c <= ' ' || c >= 127) {
493 goto out;
494 }
495 }
496 if (in_repetition)
497 goto out;
498 return true;
499 out:
500 return false;
501}
502
503/**
504 * tomoyo_correct_word - Validate a string.
505 *
506 * @string: The string to check.
507 *
508 * Check whether the given string follows the naming rules.
509 * Returns true if @string follows the naming rules, false otherwise.
510 */
511bool tomoyo_correct_word(const char *string)
512{
513 return tomoyo_correct_word2(string, strlen(string));
514}
515
516/**
517 * tomoyo_correct_path - Validate a pathname.
518 *
519 * @filename: The pathname to check.
520 *
521 * Check whether the given pathname follows the naming rules.
522 * Returns true if @filename follows the naming rules, false otherwise.
523 */
524bool tomoyo_correct_path(const char *filename)
525{
526 return *filename == '/' && tomoyo_correct_word(filename);
527}
528
529/**
530 * tomoyo_correct_domain - Check whether the given domainname follows the naming rules.
531 *
532 * @domainname: The domainname to check.
533 *
534 * Returns true if @domainname follows the naming rules, false otherwise.
535 */
536bool tomoyo_correct_domain(const unsigned char *domainname)
537{
538 if (!domainname || !tomoyo_domain_def(domainname))
539 return false;
540 domainname = strchr(domainname, ' ');
541 if (!domainname++)
542 return true;
543 while (1) {
544 const unsigned char *cp = strchr(domainname, ' ');
545
546 if (!cp)
547 break;
548 if (*domainname != '/' ||
549 !tomoyo_correct_word2(domainname, cp - domainname))
550 return false;
551 domainname = cp + 1;
552 }
553 return tomoyo_correct_path(domainname);
554}
555
556/**
557 * tomoyo_domain_def - Check whether the given token can be a domainname.
558 *
559 * @buffer: The token to check.
560 *
561 * Returns true if @buffer possibly be a domainname, false otherwise.
562 */
563bool tomoyo_domain_def(const unsigned char *buffer)
564{
565 const unsigned char *cp;
566 int len;
567
568 if (*buffer != '<')
569 return false;
570 cp = strchr(buffer, ' ');
571 if (!cp)
572 len = strlen(buffer);
573 else
574 len = cp - buffer;
575 if (buffer[len - 1] != '>' ||
576 !tomoyo_correct_word2(buffer + 1, len - 2))
577 return false;
578 return true;
579}
580
581/**
582 * tomoyo_find_domain - Find a domain by the given name.
583 *
584 * @domainname: The domainname to find.
585 *
586 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
587 *
588 * Caller holds tomoyo_read_lock().
589 */
590struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
591{
592 struct tomoyo_domain_info *domain;
593 struct tomoyo_path_info name;
594
595 name.name = domainname;
596 tomoyo_fill_path_info(&name);
597 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
598 if (!domain->is_deleted &&
599 !tomoyo_pathcmp(&name, domain->domainname))
600 return domain;
601 }
602 return NULL;
603}
604
605/**
606 * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
607 *
608 * @filename: The string to evaluate.
609 *
610 * Returns the initial length without a pattern in @filename.
611 */
612static int tomoyo_const_part_length(const char *filename)
613{
614 char c;
615 int len = 0;
616
617 if (!filename)
618 return 0;
619 while ((c = *filename++) != '\0') {
620 if (c != '\\') {
621 len++;
622 continue;
623 }
624 c = *filename++;
625 switch (c) {
626 case '\\': /* "\\" */
627 len += 2;
628 continue;
629 case '0': /* "\ooo" */
630 case '1':
631 case '2':
632 case '3':
633 c = *filename++;
634 if (c < '0' || c > '7')
635 break;
636 c = *filename++;
637 if (c < '0' || c > '7')
638 break;
639 len += 4;
640 continue;
641 }
642 break;
643 }
644 return len;
645}
646
647/**
648 * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
649 *
650 * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
651 *
652 * The caller sets "struct tomoyo_path_info"->name.
653 */
654void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
655{
656 const char *name = ptr->name;
657 const int len = strlen(name);
658
659 ptr->const_len = tomoyo_const_part_length(name);
660 ptr->is_dir = len && (name[len - 1] == '/');
661 ptr->is_patterned = (ptr->const_len < len);
662 ptr->hash = full_name_hash(NULL, name, len);
663}
664
665/**
666 * tomoyo_file_matches_pattern2 - Pattern matching without '/' character and "\-" pattern.
667 *
668 * @filename: The start of string to check.
669 * @filename_end: The end of string to check.
670 * @pattern: The start of pattern to compare.
671 * @pattern_end: The end of pattern to compare.
672 *
673 * Returns true if @filename matches @pattern, false otherwise.
674 */
675static bool tomoyo_file_matches_pattern2(const char *filename,
676 const char *filename_end,
677 const char *pattern,
678 const char *pattern_end)
679{
680 while (filename < filename_end && pattern < pattern_end) {
681 char c;
682 int i;
683 int j;
684
685 if (*pattern != '\\') {
686 if (*filename++ != *pattern++)
687 return false;
688 continue;
689 }
690 c = *filename;
691 pattern++;
692 switch (*pattern) {
693 case '?':
694 if (c == '/') {
695 return false;
696 } else if (c == '\\') {
697 if (filename[1] == '\\')
698 filename++;
699 else if (tomoyo_byte_range(filename + 1))
700 filename += 3;
701 else
702 return false;
703 }
704 break;
705 case '\\':
706 if (c != '\\')
707 return false;
708 if (*++filename != '\\')
709 return false;
710 break;
711 case '+':
712 if (!isdigit(c))
713 return false;
714 break;
715 case 'x':
716 if (!isxdigit(c))
717 return false;
718 break;
719 case 'a':
720 if (!tomoyo_alphabet_char(c))
721 return false;
722 break;
723 case '0':
724 case '1':
725 case '2':
726 case '3':
727 if (c == '\\' && tomoyo_byte_range(filename + 1)
728 && strncmp(filename + 1, pattern, 3) == 0) {
729 filename += 3;
730 pattern += 2;
731 break;
732 }
733 return false; /* Not matched. */
734 case '*':
735 case '@':
736 for (i = 0; i <= filename_end - filename; i++) {
737 if (tomoyo_file_matches_pattern2(
738 filename + i, filename_end,
739 pattern + 1, pattern_end))
740 return true;
741 c = filename[i];
742 if (c == '.' && *pattern == '@')
743 break;
744 if (c != '\\')
745 continue;
746 if (filename[i + 1] == '\\')
747 i++;
748 else if (tomoyo_byte_range(filename + i + 1))
749 i += 3;
750 else
751 break; /* Bad pattern. */
752 }
753 return false; /* Not matched. */
754 default:
755 j = 0;
756 c = *pattern;
757 if (c == '$') {
758 while (isdigit(filename[j]))
759 j++;
760 } else if (c == 'X') {
761 while (isxdigit(filename[j]))
762 j++;
763 } else if (c == 'A') {
764 while (tomoyo_alphabet_char(filename[j]))
765 j++;
766 }
767 for (i = 1; i <= j; i++) {
768 if (tomoyo_file_matches_pattern2(
769 filename + i, filename_end,
770 pattern + 1, pattern_end))
771 return true;
772 }
773 return false; /* Not matched or bad pattern. */
774 }
775 filename++;
776 pattern++;
777 }
778 while (*pattern == '\\' &&
779 (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
780 pattern += 2;
781 return filename == filename_end && pattern == pattern_end;
782}
783
784/**
785 * tomoyo_file_matches_pattern - Pattern matching without '/' character.
786 *
787 * @filename: The start of string to check.
788 * @filename_end: The end of string to check.
789 * @pattern: The start of pattern to compare.
790 * @pattern_end: The end of pattern to compare.
791 *
792 * Returns true if @filename matches @pattern, false otherwise.
793 */
794static bool tomoyo_file_matches_pattern(const char *filename,
795 const char *filename_end,
796 const char *pattern,
797 const char *pattern_end)
798{
799 const char *pattern_start = pattern;
800 bool first = true;
801 bool result;
802
803 while (pattern < pattern_end - 1) {
804 /* Split at "\-" pattern. */
805 if (*pattern++ != '\\' || *pattern++ != '-')
806 continue;
807 result = tomoyo_file_matches_pattern2(filename,
808 filename_end,
809 pattern_start,
810 pattern - 2);
811 if (first)
812 result = !result;
813 if (result)
814 return false;
815 first = false;
816 pattern_start = pattern;
817 }
818 result = tomoyo_file_matches_pattern2(filename, filename_end,
819 pattern_start, pattern_end);
820 return first ? result : !result;
821}
822
823/**
824 * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
825 *
826 * @f: The start of string to check.
827 * @p: The start of pattern to compare.
828 *
829 * Returns true if @f matches @p, false otherwise.
830 */
831static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
832{
833 const char *f_delimiter;
834 const char *p_delimiter;
835
836 while (*f && *p) {
837 f_delimiter = strchr(f, '/');
838 if (!f_delimiter)
839 f_delimiter = f + strlen(f);
840 p_delimiter = strchr(p, '/');
841 if (!p_delimiter)
842 p_delimiter = p + strlen(p);
843 if (*p == '\\' && *(p + 1) == '{')
844 goto recursive;
845 if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
846 p_delimiter))
847 return false;
848 f = f_delimiter;
849 if (*f)
850 f++;
851 p = p_delimiter;
852 if (*p)
853 p++;
854 }
855 /* Ignore trailing "\*" and "\@" in @pattern. */
856 while (*p == '\\' &&
857 (*(p + 1) == '*' || *(p + 1) == '@'))
858 p += 2;
859 return !*f && !*p;
860 recursive:
861 /*
862 * The "\{" pattern is permitted only after '/' character.
863 * This guarantees that below "*(p - 1)" is safe.
864 * Also, the "\}" pattern is permitted only before '/' character
865 * so that "\{" + "\}" pair will not break the "\-" operator.
866 */
867 if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
868 *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
869 return false; /* Bad pattern. */
870 do {
871 /* Compare current component with pattern. */
872 if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
873 p_delimiter - 2))
874 break;
875 /* Proceed to next component. */
876 f = f_delimiter;
877 if (!*f)
878 break;
879 f++;
880 /* Continue comparison. */
881 if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
882 return true;
883 f_delimiter = strchr(f, '/');
884 } while (f_delimiter);
885 return false; /* Not matched. */
886}
887
888/**
889 * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
890 *
891 * @filename: The filename to check.
892 * @pattern: The pattern to compare.
893 *
894 * Returns true if matches, false otherwise.
895 *
896 * The following patterns are available.
897 * \\ \ itself.
898 * \ooo Octal representation of a byte.
899 * \* Zero or more repetitions of characters other than '/'.
900 * \@ Zero or more repetitions of characters other than '/' or '.'.
901 * \? 1 byte character other than '/'.
902 * \$ One or more repetitions of decimal digits.
903 * \+ 1 decimal digit.
904 * \X One or more repetitions of hexadecimal digits.
905 * \x 1 hexadecimal digit.
906 * \A One or more repetitions of alphabet characters.
907 * \a 1 alphabet character.
908 *
909 * \- Subtraction operator.
910 *
911 * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
912 * /dir/dir/dir/ ).
913 */
914bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
915 const struct tomoyo_path_info *pattern)
916{
917 const char *f = filename->name;
918 const char *p = pattern->name;
919 const int len = pattern->const_len;
920
921 /* If @pattern doesn't contain pattern, I can use strcmp(). */
922 if (!pattern->is_patterned)
923 return !tomoyo_pathcmp(filename, pattern);
924 /* Don't compare directory and non-directory. */
925 if (filename->is_dir != pattern->is_dir)
926 return false;
927 /* Compare the initial length without patterns. */
928 if (strncmp(f, p, len))
929 return false;
930 f += len;
931 p += len;
932 return tomoyo_path_matches_pattern2(f, p);
933}
934
935/**
936 * tomoyo_get_exe - Get tomoyo_realpath() of current process.
937 *
938 * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
939 *
940 * This function uses kzalloc(), so the caller must call kfree()
941 * if this function didn't return NULL.
942 */
943const char *tomoyo_get_exe(void)
944{
945 struct file *exe_file;
946 const char *cp;
947 struct mm_struct *mm = current->mm;
948
949 if (!mm)
950 return NULL;
951 exe_file = get_mm_exe_file(mm);
952 if (!exe_file)
953 return NULL;
954
955 cp = tomoyo_realpath_from_path(&exe_file->f_path);
956 fput(exe_file);
957 return cp;
958}
959
960/**
961 * tomoyo_get_mode - Get MAC mode.
962 *
963 * @ns: Pointer to "struct tomoyo_policy_namespace".
964 * @profile: Profile number.
965 * @index: Index number of functionality.
966 *
967 * Returns mode.
968 */
969int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
970 const u8 index)
971{
972 u8 mode;
973 struct tomoyo_profile *p;
974
975 if (!tomoyo_policy_loaded)
976 return TOMOYO_CONFIG_DISABLED;
977 p = tomoyo_profile(ns, profile);
978 mode = p->config[index];
979 if (mode == TOMOYO_CONFIG_USE_DEFAULT)
980 mode = p->config[tomoyo_index2category[index]
981 + TOMOYO_MAX_MAC_INDEX];
982 if (mode == TOMOYO_CONFIG_USE_DEFAULT)
983 mode = p->default_config;
984 return mode & 3;
985}
986
987/**
988 * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members.
989 *
990 * @r: Pointer to "struct tomoyo_request_info" to initialize.
991 * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain().
992 * @index: Index number of functionality.
993 *
994 * Returns mode.
995 */
996int tomoyo_init_request_info(struct tomoyo_request_info *r,
997 struct tomoyo_domain_info *domain, const u8 index)
998{
999 u8 profile;
1000
1001 memset(r, 0, sizeof(*r));
1002 if (!domain)
1003 domain = tomoyo_domain();
1004 r->domain = domain;
1005 profile = domain->profile;
1006 r->profile = profile;
1007 r->type = index;
1008 r->mode = tomoyo_get_mode(domain->ns, profile, index);
1009 return r->mode;
1010}
1011
1012/**
1013 * tomoyo_domain_quota_is_ok - Check for domain's quota.
1014 *
1015 * @r: Pointer to "struct tomoyo_request_info".
1016 *
1017 * Returns true if the domain is not exceeded quota, false otherwise.
1018 *
1019 * Caller holds tomoyo_read_lock().
1020 */
1021bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
1022{
1023 unsigned int count = 0;
1024 struct tomoyo_domain_info *domain = r->domain;
1025 struct tomoyo_acl_info *ptr;
1026
1027 if (r->mode != TOMOYO_CONFIG_LEARNING)
1028 return false;
1029 if (!domain)
1030 return true;
1031 list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
1032 u16 perm;
1033 u8 i;
1034
1035 if (ptr->is_deleted)
1036 continue;
1037 switch (ptr->type) {
1038 case TOMOYO_TYPE_PATH_ACL:
1039 perm = container_of(ptr, struct tomoyo_path_acl, head)
1040 ->perm;
1041 break;
1042 case TOMOYO_TYPE_PATH2_ACL:
1043 perm = container_of(ptr, struct tomoyo_path2_acl, head)
1044 ->perm;
1045 break;
1046 case TOMOYO_TYPE_PATH_NUMBER_ACL:
1047 perm = container_of(ptr, struct tomoyo_path_number_acl,
1048 head)->perm;
1049 break;
1050 case TOMOYO_TYPE_MKDEV_ACL:
1051 perm = container_of(ptr, struct tomoyo_mkdev_acl,
1052 head)->perm;
1053 break;
1054 case TOMOYO_TYPE_INET_ACL:
1055 perm = container_of(ptr, struct tomoyo_inet_acl,
1056 head)->perm;
1057 break;
1058 case TOMOYO_TYPE_UNIX_ACL:
1059 perm = container_of(ptr, struct tomoyo_unix_acl,
1060 head)->perm;
1061 break;
1062 case TOMOYO_TYPE_MANUAL_TASK_ACL:
1063 perm = 0;
1064 break;
1065 default:
1066 perm = 1;
1067 }
1068 for (i = 0; i < 16; i++)
1069 if (perm & (1 << i))
1070 count++;
1071 }
1072 if (count < tomoyo_profile(domain->ns, domain->profile)->
1073 pref[TOMOYO_PREF_MAX_LEARNING_ENTRY])
1074 return true;
1075 if (!domain->flags[TOMOYO_DIF_QUOTA_WARNED]) {
1076 domain->flags[TOMOYO_DIF_QUOTA_WARNED] = true;
1077 /* r->granted = false; */
1078 tomoyo_write_log(r, "%s", tomoyo_dif[TOMOYO_DIF_QUOTA_WARNED]);
1079#ifndef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
1080 pr_warn("WARNING: Domain '%s' has too many ACLs to hold. Stopped learning mode.\n",
1081 domain->domainname->name);
1082#endif
1083 }
1084 return false;
1085}
1/*
2 * security/tomoyo/util.c
3 *
4 * Copyright (C) 2005-2011 NTT DATA CORPORATION
5 */
6
7#include <linux/slab.h>
8#include "common.h"
9
10/* Lock for protecting policy. */
11DEFINE_MUTEX(tomoyo_policy_lock);
12
13/* Has /sbin/init started? */
14bool tomoyo_policy_loaded;
15
16/*
17 * Mapping table from "enum tomoyo_mac_index" to
18 * "enum tomoyo_mac_category_index".
19 */
20const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX] = {
21 /* CONFIG::file group */
22 [TOMOYO_MAC_FILE_EXECUTE] = TOMOYO_MAC_CATEGORY_FILE,
23 [TOMOYO_MAC_FILE_OPEN] = TOMOYO_MAC_CATEGORY_FILE,
24 [TOMOYO_MAC_FILE_CREATE] = TOMOYO_MAC_CATEGORY_FILE,
25 [TOMOYO_MAC_FILE_UNLINK] = TOMOYO_MAC_CATEGORY_FILE,
26 [TOMOYO_MAC_FILE_GETATTR] = TOMOYO_MAC_CATEGORY_FILE,
27 [TOMOYO_MAC_FILE_MKDIR] = TOMOYO_MAC_CATEGORY_FILE,
28 [TOMOYO_MAC_FILE_RMDIR] = TOMOYO_MAC_CATEGORY_FILE,
29 [TOMOYO_MAC_FILE_MKFIFO] = TOMOYO_MAC_CATEGORY_FILE,
30 [TOMOYO_MAC_FILE_MKSOCK] = TOMOYO_MAC_CATEGORY_FILE,
31 [TOMOYO_MAC_FILE_TRUNCATE] = TOMOYO_MAC_CATEGORY_FILE,
32 [TOMOYO_MAC_FILE_SYMLINK] = TOMOYO_MAC_CATEGORY_FILE,
33 [TOMOYO_MAC_FILE_MKBLOCK] = TOMOYO_MAC_CATEGORY_FILE,
34 [TOMOYO_MAC_FILE_MKCHAR] = TOMOYO_MAC_CATEGORY_FILE,
35 [TOMOYO_MAC_FILE_LINK] = TOMOYO_MAC_CATEGORY_FILE,
36 [TOMOYO_MAC_FILE_RENAME] = TOMOYO_MAC_CATEGORY_FILE,
37 [TOMOYO_MAC_FILE_CHMOD] = TOMOYO_MAC_CATEGORY_FILE,
38 [TOMOYO_MAC_FILE_CHOWN] = TOMOYO_MAC_CATEGORY_FILE,
39 [TOMOYO_MAC_FILE_CHGRP] = TOMOYO_MAC_CATEGORY_FILE,
40 [TOMOYO_MAC_FILE_IOCTL] = TOMOYO_MAC_CATEGORY_FILE,
41 [TOMOYO_MAC_FILE_CHROOT] = TOMOYO_MAC_CATEGORY_FILE,
42 [TOMOYO_MAC_FILE_MOUNT] = TOMOYO_MAC_CATEGORY_FILE,
43 [TOMOYO_MAC_FILE_UMOUNT] = TOMOYO_MAC_CATEGORY_FILE,
44 [TOMOYO_MAC_FILE_PIVOT_ROOT] = TOMOYO_MAC_CATEGORY_FILE,
45 /* CONFIG::network group */
46 [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] =
47 TOMOYO_MAC_CATEGORY_NETWORK,
48 [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] =
49 TOMOYO_MAC_CATEGORY_NETWORK,
50 [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] =
51 TOMOYO_MAC_CATEGORY_NETWORK,
52 [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] =
53 TOMOYO_MAC_CATEGORY_NETWORK,
54 [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] =
55 TOMOYO_MAC_CATEGORY_NETWORK,
56 [TOMOYO_MAC_NETWORK_INET_RAW_BIND] =
57 TOMOYO_MAC_CATEGORY_NETWORK,
58 [TOMOYO_MAC_NETWORK_INET_RAW_SEND] =
59 TOMOYO_MAC_CATEGORY_NETWORK,
60 [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] =
61 TOMOYO_MAC_CATEGORY_NETWORK,
62 [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] =
63 TOMOYO_MAC_CATEGORY_NETWORK,
64 [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] =
65 TOMOYO_MAC_CATEGORY_NETWORK,
66 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] =
67 TOMOYO_MAC_CATEGORY_NETWORK,
68 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] =
69 TOMOYO_MAC_CATEGORY_NETWORK,
70 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] =
71 TOMOYO_MAC_CATEGORY_NETWORK,
72 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] =
73 TOMOYO_MAC_CATEGORY_NETWORK,
74 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] =
75 TOMOYO_MAC_CATEGORY_NETWORK,
76 /* CONFIG::misc group */
77 [TOMOYO_MAC_ENVIRON] = TOMOYO_MAC_CATEGORY_MISC,
78};
79
80/**
81 * tomoyo_convert_time - Convert time_t to YYYY/MM/DD hh/mm/ss.
82 *
83 * @time: Seconds since 1970/01/01 00:00:00.
84 * @stamp: Pointer to "struct tomoyo_time".
85 *
86 * Returns nothing.
87 *
88 * This function does not handle Y2038 problem.
89 */
90void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp)
91{
92 static const u16 tomoyo_eom[2][12] = {
93 { 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
94 { 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
95 };
96 u16 y;
97 u8 m;
98 bool r;
99 stamp->sec = time % 60;
100 time /= 60;
101 stamp->min = time % 60;
102 time /= 60;
103 stamp->hour = time % 24;
104 time /= 24;
105 for (y = 1970; ; y++) {
106 const unsigned short days = (y & 3) ? 365 : 366;
107 if (time < days)
108 break;
109 time -= days;
110 }
111 r = (y & 3) == 0;
112 for (m = 0; m < 11 && time >= tomoyo_eom[r][m]; m++)
113 ;
114 if (m)
115 time -= tomoyo_eom[r][m - 1];
116 stamp->year = y;
117 stamp->month = ++m;
118 stamp->day = ++time;
119}
120
121/**
122 * tomoyo_permstr - Find permission keywords.
123 *
124 * @string: String representation for permissions in foo/bar/buz format.
125 * @keyword: Keyword to find from @string/
126 *
127 * Returns ture if @keyword was found in @string, false otherwise.
128 *
129 * This function assumes that strncmp(w1, w2, strlen(w1)) != 0 if w1 != w2.
130 */
131bool tomoyo_permstr(const char *string, const char *keyword)
132{
133 const char *cp = strstr(string, keyword);
134 if (cp)
135 return cp == string || *(cp - 1) == '/';
136 return false;
137}
138
139/**
140 * tomoyo_read_token - Read a word from a line.
141 *
142 * @param: Pointer to "struct tomoyo_acl_param".
143 *
144 * Returns a word on success, "" otherwise.
145 *
146 * To allow the caller to skip NULL check, this function returns "" rather than
147 * NULL if there is no more words to read.
148 */
149char *tomoyo_read_token(struct tomoyo_acl_param *param)
150{
151 char *pos = param->data;
152 char *del = strchr(pos, ' ');
153 if (del)
154 *del++ = '\0';
155 else
156 del = pos + strlen(pos);
157 param->data = del;
158 return pos;
159}
160
161/**
162 * tomoyo_get_domainname - Read a domainname from a line.
163 *
164 * @param: Pointer to "struct tomoyo_acl_param".
165 *
166 * Returns a domainname on success, NULL otherwise.
167 */
168const struct tomoyo_path_info *tomoyo_get_domainname
169(struct tomoyo_acl_param *param)
170{
171 char *start = param->data;
172 char *pos = start;
173 while (*pos) {
174 if (*pos++ != ' ' || *pos++ == '/')
175 continue;
176 pos -= 2;
177 *pos++ = '\0';
178 break;
179 }
180 param->data = pos;
181 if (tomoyo_correct_domain(start))
182 return tomoyo_get_name(start);
183 return NULL;
184}
185
186/**
187 * tomoyo_parse_ulong - Parse an "unsigned long" value.
188 *
189 * @result: Pointer to "unsigned long".
190 * @str: Pointer to string to parse.
191 *
192 * Returns one of values in "enum tomoyo_value_type".
193 *
194 * The @src is updated to point the first character after the value
195 * on success.
196 */
197u8 tomoyo_parse_ulong(unsigned long *result, char **str)
198{
199 const char *cp = *str;
200 char *ep;
201 int base = 10;
202 if (*cp == '0') {
203 char c = *(cp + 1);
204 if (c == 'x' || c == 'X') {
205 base = 16;
206 cp += 2;
207 } else if (c >= '0' && c <= '7') {
208 base = 8;
209 cp++;
210 }
211 }
212 *result = simple_strtoul(cp, &ep, base);
213 if (cp == ep)
214 return TOMOYO_VALUE_TYPE_INVALID;
215 *str = ep;
216 switch (base) {
217 case 16:
218 return TOMOYO_VALUE_TYPE_HEXADECIMAL;
219 case 8:
220 return TOMOYO_VALUE_TYPE_OCTAL;
221 default:
222 return TOMOYO_VALUE_TYPE_DECIMAL;
223 }
224}
225
226/**
227 * tomoyo_print_ulong - Print an "unsigned long" value.
228 *
229 * @buffer: Pointer to buffer.
230 * @buffer_len: Size of @buffer.
231 * @value: An "unsigned long" value.
232 * @type: Type of @value.
233 *
234 * Returns nothing.
235 */
236void tomoyo_print_ulong(char *buffer, const int buffer_len,
237 const unsigned long value, const u8 type)
238{
239 if (type == TOMOYO_VALUE_TYPE_DECIMAL)
240 snprintf(buffer, buffer_len, "%lu", value);
241 else if (type == TOMOYO_VALUE_TYPE_OCTAL)
242 snprintf(buffer, buffer_len, "0%lo", value);
243 else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
244 snprintf(buffer, buffer_len, "0x%lX", value);
245 else
246 snprintf(buffer, buffer_len, "type(%u)", type);
247}
248
249/**
250 * tomoyo_parse_name_union - Parse a tomoyo_name_union.
251 *
252 * @param: Pointer to "struct tomoyo_acl_param".
253 * @ptr: Pointer to "struct tomoyo_name_union".
254 *
255 * Returns true on success, false otherwise.
256 */
257bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
258 struct tomoyo_name_union *ptr)
259{
260 char *filename;
261 if (param->data[0] == '@') {
262 param->data++;
263 ptr->group = tomoyo_get_group(param, TOMOYO_PATH_GROUP);
264 return ptr->group != NULL;
265 }
266 filename = tomoyo_read_token(param);
267 if (!tomoyo_correct_word(filename))
268 return false;
269 ptr->filename = tomoyo_get_name(filename);
270 return ptr->filename != NULL;
271}
272
273/**
274 * tomoyo_parse_number_union - Parse a tomoyo_number_union.
275 *
276 * @param: Pointer to "struct tomoyo_acl_param".
277 * @ptr: Pointer to "struct tomoyo_number_union".
278 *
279 * Returns true on success, false otherwise.
280 */
281bool tomoyo_parse_number_union(struct tomoyo_acl_param *param,
282 struct tomoyo_number_union *ptr)
283{
284 char *data;
285 u8 type;
286 unsigned long v;
287 memset(ptr, 0, sizeof(*ptr));
288 if (param->data[0] == '@') {
289 param->data++;
290 ptr->group = tomoyo_get_group(param, TOMOYO_NUMBER_GROUP);
291 return ptr->group != NULL;
292 }
293 data = tomoyo_read_token(param);
294 type = tomoyo_parse_ulong(&v, &data);
295 if (type == TOMOYO_VALUE_TYPE_INVALID)
296 return false;
297 ptr->values[0] = v;
298 ptr->value_type[0] = type;
299 if (!*data) {
300 ptr->values[1] = v;
301 ptr->value_type[1] = type;
302 return true;
303 }
304 if (*data++ != '-')
305 return false;
306 type = tomoyo_parse_ulong(&v, &data);
307 if (type == TOMOYO_VALUE_TYPE_INVALID || *data || ptr->values[0] > v)
308 return false;
309 ptr->values[1] = v;
310 ptr->value_type[1] = type;
311 return true;
312}
313
314/**
315 * tomoyo_byte_range - Check whether the string is a \ooo style octal value.
316 *
317 * @str: Pointer to the string.
318 *
319 * Returns true if @str is a \ooo style octal value, false otherwise.
320 *
321 * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
322 * This function verifies that \ooo is in valid range.
323 */
324static inline bool tomoyo_byte_range(const char *str)
325{
326 return *str >= '0' && *str++ <= '3' &&
327 *str >= '0' && *str++ <= '7' &&
328 *str >= '0' && *str <= '7';
329}
330
331/**
332 * tomoyo_alphabet_char - Check whether the character is an alphabet.
333 *
334 * @c: The character to check.
335 *
336 * Returns true if @c is an alphabet character, false otherwise.
337 */
338static inline bool tomoyo_alphabet_char(const char c)
339{
340 return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
341}
342
343/**
344 * tomoyo_make_byte - Make byte value from three octal characters.
345 *
346 * @c1: The first character.
347 * @c2: The second character.
348 * @c3: The third character.
349 *
350 * Returns byte value.
351 */
352static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
353{
354 return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
355}
356
357/**
358 * tomoyo_valid - Check whether the character is a valid char.
359 *
360 * @c: The character to check.
361 *
362 * Returns true if @c is a valid character, false otherwise.
363 */
364static inline bool tomoyo_valid(const unsigned char c)
365{
366 return c > ' ' && c < 127;
367}
368
369/**
370 * tomoyo_invalid - Check whether the character is an invalid char.
371 *
372 * @c: The character to check.
373 *
374 * Returns true if @c is an invalid character, false otherwise.
375 */
376static inline bool tomoyo_invalid(const unsigned char c)
377{
378 return c && (c <= ' ' || c >= 127);
379}
380
381/**
382 * tomoyo_str_starts - Check whether the given string starts with the given keyword.
383 *
384 * @src: Pointer to pointer to the string.
385 * @find: Pointer to the keyword.
386 *
387 * Returns true if @src starts with @find, false otherwise.
388 *
389 * The @src is updated to point the first character after the @find
390 * if @src starts with @find.
391 */
392bool tomoyo_str_starts(char **src, const char *find)
393{
394 const int len = strlen(find);
395 char *tmp = *src;
396
397 if (strncmp(tmp, find, len))
398 return false;
399 tmp += len;
400 *src = tmp;
401 return true;
402}
403
404/**
405 * tomoyo_normalize_line - Format string.
406 *
407 * @buffer: The line to normalize.
408 *
409 * Leading and trailing whitespaces are removed.
410 * Multiple whitespaces are packed into single space.
411 *
412 * Returns nothing.
413 */
414void tomoyo_normalize_line(unsigned char *buffer)
415{
416 unsigned char *sp = buffer;
417 unsigned char *dp = buffer;
418 bool first = true;
419
420 while (tomoyo_invalid(*sp))
421 sp++;
422 while (*sp) {
423 if (!first)
424 *dp++ = ' ';
425 first = false;
426 while (tomoyo_valid(*sp))
427 *dp++ = *sp++;
428 while (tomoyo_invalid(*sp))
429 sp++;
430 }
431 *dp = '\0';
432}
433
434/**
435 * tomoyo_correct_word2 - Validate a string.
436 *
437 * @string: The string to check. Maybe non-'\0'-terminated.
438 * @len: Length of @string.
439 *
440 * Check whether the given string follows the naming rules.
441 * Returns true if @string follows the naming rules, false otherwise.
442 */
443static bool tomoyo_correct_word2(const char *string, size_t len)
444{
445 const char *const start = string;
446 bool in_repetition = false;
447 unsigned char c;
448 unsigned char d;
449 unsigned char e;
450 if (!len)
451 goto out;
452 while (len--) {
453 c = *string++;
454 if (c == '\\') {
455 if (!len--)
456 goto out;
457 c = *string++;
458 switch (c) {
459 case '\\': /* "\\" */
460 continue;
461 case '$': /* "\$" */
462 case '+': /* "\+" */
463 case '?': /* "\?" */
464 case '*': /* "\*" */
465 case '@': /* "\@" */
466 case 'x': /* "\x" */
467 case 'X': /* "\X" */
468 case 'a': /* "\a" */
469 case 'A': /* "\A" */
470 case '-': /* "\-" */
471 continue;
472 case '{': /* "/\{" */
473 if (string - 3 < start || *(string - 3) != '/')
474 break;
475 in_repetition = true;
476 continue;
477 case '}': /* "\}/" */
478 if (*string != '/')
479 break;
480 if (!in_repetition)
481 break;
482 in_repetition = false;
483 continue;
484 case '0': /* "\ooo" */
485 case '1':
486 case '2':
487 case '3':
488 if (!len-- || !len--)
489 break;
490 d = *string++;
491 e = *string++;
492 if (d < '0' || d > '7' || e < '0' || e > '7')
493 break;
494 c = tomoyo_make_byte(c, d, e);
495 if (c <= ' ' || c >= 127)
496 continue;
497 }
498 goto out;
499 } else if (in_repetition && c == '/') {
500 goto out;
501 } else if (c <= ' ' || c >= 127) {
502 goto out;
503 }
504 }
505 if (in_repetition)
506 goto out;
507 return true;
508 out:
509 return false;
510}
511
512/**
513 * tomoyo_correct_word - Validate a string.
514 *
515 * @string: The string to check.
516 *
517 * Check whether the given string follows the naming rules.
518 * Returns true if @string follows the naming rules, false otherwise.
519 */
520bool tomoyo_correct_word(const char *string)
521{
522 return tomoyo_correct_word2(string, strlen(string));
523}
524
525/**
526 * tomoyo_correct_path - Validate a pathname.
527 *
528 * @filename: The pathname to check.
529 *
530 * Check whether the given pathname follows the naming rules.
531 * Returns true if @filename follows the naming rules, false otherwise.
532 */
533bool tomoyo_correct_path(const char *filename)
534{
535 return *filename == '/' && tomoyo_correct_word(filename);
536}
537
538/**
539 * tomoyo_correct_domain - Check whether the given domainname follows the naming rules.
540 *
541 * @domainname: The domainname to check.
542 *
543 * Returns true if @domainname follows the naming rules, false otherwise.
544 */
545bool tomoyo_correct_domain(const unsigned char *domainname)
546{
547 if (!domainname || !tomoyo_domain_def(domainname))
548 return false;
549 domainname = strchr(domainname, ' ');
550 if (!domainname++)
551 return true;
552 while (1) {
553 const unsigned char *cp = strchr(domainname, ' ');
554 if (!cp)
555 break;
556 if (*domainname != '/' ||
557 !tomoyo_correct_word2(domainname, cp - domainname))
558 return false;
559 domainname = cp + 1;
560 }
561 return tomoyo_correct_path(domainname);
562}
563
564/**
565 * tomoyo_domain_def - Check whether the given token can be a domainname.
566 *
567 * @buffer: The token to check.
568 *
569 * Returns true if @buffer possibly be a domainname, false otherwise.
570 */
571bool tomoyo_domain_def(const unsigned char *buffer)
572{
573 const unsigned char *cp;
574 int len;
575 if (*buffer != '<')
576 return false;
577 cp = strchr(buffer, ' ');
578 if (!cp)
579 len = strlen(buffer);
580 else
581 len = cp - buffer;
582 if (buffer[len - 1] != '>' ||
583 !tomoyo_correct_word2(buffer + 1, len - 2))
584 return false;
585 return true;
586}
587
588/**
589 * tomoyo_find_domain - Find a domain by the given name.
590 *
591 * @domainname: The domainname to find.
592 *
593 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
594 *
595 * Caller holds tomoyo_read_lock().
596 */
597struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
598{
599 struct tomoyo_domain_info *domain;
600 struct tomoyo_path_info name;
601
602 name.name = domainname;
603 tomoyo_fill_path_info(&name);
604 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
605 if (!domain->is_deleted &&
606 !tomoyo_pathcmp(&name, domain->domainname))
607 return domain;
608 }
609 return NULL;
610}
611
612/**
613 * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
614 *
615 * @filename: The string to evaluate.
616 *
617 * Returns the initial length without a pattern in @filename.
618 */
619static int tomoyo_const_part_length(const char *filename)
620{
621 char c;
622 int len = 0;
623
624 if (!filename)
625 return 0;
626 while ((c = *filename++) != '\0') {
627 if (c != '\\') {
628 len++;
629 continue;
630 }
631 c = *filename++;
632 switch (c) {
633 case '\\': /* "\\" */
634 len += 2;
635 continue;
636 case '0': /* "\ooo" */
637 case '1':
638 case '2':
639 case '3':
640 c = *filename++;
641 if (c < '0' || c > '7')
642 break;
643 c = *filename++;
644 if (c < '0' || c > '7')
645 break;
646 len += 4;
647 continue;
648 }
649 break;
650 }
651 return len;
652}
653
654/**
655 * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
656 *
657 * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
658 *
659 * The caller sets "struct tomoyo_path_info"->name.
660 */
661void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
662{
663 const char *name = ptr->name;
664 const int len = strlen(name);
665
666 ptr->const_len = tomoyo_const_part_length(name);
667 ptr->is_dir = len && (name[len - 1] == '/');
668 ptr->is_patterned = (ptr->const_len < len);
669 ptr->hash = full_name_hash(name, len);
670}
671
672/**
673 * tomoyo_file_matches_pattern2 - Pattern matching without '/' character and "\-" pattern.
674 *
675 * @filename: The start of string to check.
676 * @filename_end: The end of string to check.
677 * @pattern: The start of pattern to compare.
678 * @pattern_end: The end of pattern to compare.
679 *
680 * Returns true if @filename matches @pattern, false otherwise.
681 */
682static bool tomoyo_file_matches_pattern2(const char *filename,
683 const char *filename_end,
684 const char *pattern,
685 const char *pattern_end)
686{
687 while (filename < filename_end && pattern < pattern_end) {
688 char c;
689 if (*pattern != '\\') {
690 if (*filename++ != *pattern++)
691 return false;
692 continue;
693 }
694 c = *filename;
695 pattern++;
696 switch (*pattern) {
697 int i;
698 int j;
699 case '?':
700 if (c == '/') {
701 return false;
702 } else if (c == '\\') {
703 if (filename[1] == '\\')
704 filename++;
705 else if (tomoyo_byte_range(filename + 1))
706 filename += 3;
707 else
708 return false;
709 }
710 break;
711 case '\\':
712 if (c != '\\')
713 return false;
714 if (*++filename != '\\')
715 return false;
716 break;
717 case '+':
718 if (!isdigit(c))
719 return false;
720 break;
721 case 'x':
722 if (!isxdigit(c))
723 return false;
724 break;
725 case 'a':
726 if (!tomoyo_alphabet_char(c))
727 return false;
728 break;
729 case '0':
730 case '1':
731 case '2':
732 case '3':
733 if (c == '\\' && tomoyo_byte_range(filename + 1)
734 && strncmp(filename + 1, pattern, 3) == 0) {
735 filename += 3;
736 pattern += 2;
737 break;
738 }
739 return false; /* Not matched. */
740 case '*':
741 case '@':
742 for (i = 0; i <= filename_end - filename; i++) {
743 if (tomoyo_file_matches_pattern2(
744 filename + i, filename_end,
745 pattern + 1, pattern_end))
746 return true;
747 c = filename[i];
748 if (c == '.' && *pattern == '@')
749 break;
750 if (c != '\\')
751 continue;
752 if (filename[i + 1] == '\\')
753 i++;
754 else if (tomoyo_byte_range(filename + i + 1))
755 i += 3;
756 else
757 break; /* Bad pattern. */
758 }
759 return false; /* Not matched. */
760 default:
761 j = 0;
762 c = *pattern;
763 if (c == '$') {
764 while (isdigit(filename[j]))
765 j++;
766 } else if (c == 'X') {
767 while (isxdigit(filename[j]))
768 j++;
769 } else if (c == 'A') {
770 while (tomoyo_alphabet_char(filename[j]))
771 j++;
772 }
773 for (i = 1; i <= j; i++) {
774 if (tomoyo_file_matches_pattern2(
775 filename + i, filename_end,
776 pattern + 1, pattern_end))
777 return true;
778 }
779 return false; /* Not matched or bad pattern. */
780 }
781 filename++;
782 pattern++;
783 }
784 while (*pattern == '\\' &&
785 (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
786 pattern += 2;
787 return filename == filename_end && pattern == pattern_end;
788}
789
790/**
791 * tomoyo_file_matches_pattern - Pattern matching without '/' character.
792 *
793 * @filename: The start of string to check.
794 * @filename_end: The end of string to check.
795 * @pattern: The start of pattern to compare.
796 * @pattern_end: The end of pattern to compare.
797 *
798 * Returns true if @filename matches @pattern, false otherwise.
799 */
800static bool tomoyo_file_matches_pattern(const char *filename,
801 const char *filename_end,
802 const char *pattern,
803 const char *pattern_end)
804{
805 const char *pattern_start = pattern;
806 bool first = true;
807 bool result;
808
809 while (pattern < pattern_end - 1) {
810 /* Split at "\-" pattern. */
811 if (*pattern++ != '\\' || *pattern++ != '-')
812 continue;
813 result = tomoyo_file_matches_pattern2(filename,
814 filename_end,
815 pattern_start,
816 pattern - 2);
817 if (first)
818 result = !result;
819 if (result)
820 return false;
821 first = false;
822 pattern_start = pattern;
823 }
824 result = tomoyo_file_matches_pattern2(filename, filename_end,
825 pattern_start, pattern_end);
826 return first ? result : !result;
827}
828
829/**
830 * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
831 *
832 * @f: The start of string to check.
833 * @p: The start of pattern to compare.
834 *
835 * Returns true if @f matches @p, false otherwise.
836 */
837static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
838{
839 const char *f_delimiter;
840 const char *p_delimiter;
841
842 while (*f && *p) {
843 f_delimiter = strchr(f, '/');
844 if (!f_delimiter)
845 f_delimiter = f + strlen(f);
846 p_delimiter = strchr(p, '/');
847 if (!p_delimiter)
848 p_delimiter = p + strlen(p);
849 if (*p == '\\' && *(p + 1) == '{')
850 goto recursive;
851 if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
852 p_delimiter))
853 return false;
854 f = f_delimiter;
855 if (*f)
856 f++;
857 p = p_delimiter;
858 if (*p)
859 p++;
860 }
861 /* Ignore trailing "\*" and "\@" in @pattern. */
862 while (*p == '\\' &&
863 (*(p + 1) == '*' || *(p + 1) == '@'))
864 p += 2;
865 return !*f && !*p;
866 recursive:
867 /*
868 * The "\{" pattern is permitted only after '/' character.
869 * This guarantees that below "*(p - 1)" is safe.
870 * Also, the "\}" pattern is permitted only before '/' character
871 * so that "\{" + "\}" pair will not break the "\-" operator.
872 */
873 if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
874 *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
875 return false; /* Bad pattern. */
876 do {
877 /* Compare current component with pattern. */
878 if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
879 p_delimiter - 2))
880 break;
881 /* Proceed to next component. */
882 f = f_delimiter;
883 if (!*f)
884 break;
885 f++;
886 /* Continue comparison. */
887 if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
888 return true;
889 f_delimiter = strchr(f, '/');
890 } while (f_delimiter);
891 return false; /* Not matched. */
892}
893
894/**
895 * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
896 *
897 * @filename: The filename to check.
898 * @pattern: The pattern to compare.
899 *
900 * Returns true if matches, false otherwise.
901 *
902 * The following patterns are available.
903 * \\ \ itself.
904 * \ooo Octal representation of a byte.
905 * \* Zero or more repetitions of characters other than '/'.
906 * \@ Zero or more repetitions of characters other than '/' or '.'.
907 * \? 1 byte character other than '/'.
908 * \$ One or more repetitions of decimal digits.
909 * \+ 1 decimal digit.
910 * \X One or more repetitions of hexadecimal digits.
911 * \x 1 hexadecimal digit.
912 * \A One or more repetitions of alphabet characters.
913 * \a 1 alphabet character.
914 *
915 * \- Subtraction operator.
916 *
917 * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
918 * /dir/dir/dir/ ).
919 */
920bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
921 const struct tomoyo_path_info *pattern)
922{
923 const char *f = filename->name;
924 const char *p = pattern->name;
925 const int len = pattern->const_len;
926
927 /* If @pattern doesn't contain pattern, I can use strcmp(). */
928 if (!pattern->is_patterned)
929 return !tomoyo_pathcmp(filename, pattern);
930 /* Don't compare directory and non-directory. */
931 if (filename->is_dir != pattern->is_dir)
932 return false;
933 /* Compare the initial length without patterns. */
934 if (strncmp(f, p, len))
935 return false;
936 f += len;
937 p += len;
938 return tomoyo_path_matches_pattern2(f, p);
939}
940
941/**
942 * tomoyo_get_exe - Get tomoyo_realpath() of current process.
943 *
944 * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
945 *
946 * This function uses kzalloc(), so the caller must call kfree()
947 * if this function didn't return NULL.
948 */
949const char *tomoyo_get_exe(void)
950{
951 struct mm_struct *mm = current->mm;
952 const char *cp = NULL;
953
954 if (!mm)
955 return NULL;
956 down_read(&mm->mmap_sem);
957 if (mm->exe_file)
958 cp = tomoyo_realpath_from_path(&mm->exe_file->f_path);
959 up_read(&mm->mmap_sem);
960 return cp;
961}
962
963/**
964 * tomoyo_get_mode - Get MAC mode.
965 *
966 * @ns: Pointer to "struct tomoyo_policy_namespace".
967 * @profile: Profile number.
968 * @index: Index number of functionality.
969 *
970 * Returns mode.
971 */
972int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
973 const u8 index)
974{
975 u8 mode;
976 struct tomoyo_profile *p;
977
978 if (!tomoyo_policy_loaded)
979 return TOMOYO_CONFIG_DISABLED;
980 p = tomoyo_profile(ns, profile);
981 mode = p->config[index];
982 if (mode == TOMOYO_CONFIG_USE_DEFAULT)
983 mode = p->config[tomoyo_index2category[index]
984 + TOMOYO_MAX_MAC_INDEX];
985 if (mode == TOMOYO_CONFIG_USE_DEFAULT)
986 mode = p->default_config;
987 return mode & 3;
988}
989
990/**
991 * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members.
992 *
993 * @r: Pointer to "struct tomoyo_request_info" to initialize.
994 * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain().
995 * @index: Index number of functionality.
996 *
997 * Returns mode.
998 */
999int tomoyo_init_request_info(struct tomoyo_request_info *r,
1000 struct tomoyo_domain_info *domain, const u8 index)
1001{
1002 u8 profile;
1003 memset(r, 0, sizeof(*r));
1004 if (!domain)
1005 domain = tomoyo_domain();
1006 r->domain = domain;
1007 profile = domain->profile;
1008 r->profile = profile;
1009 r->type = index;
1010 r->mode = tomoyo_get_mode(domain->ns, profile, index);
1011 return r->mode;
1012}
1013
1014/**
1015 * tomoyo_domain_quota_is_ok - Check for domain's quota.
1016 *
1017 * @r: Pointer to "struct tomoyo_request_info".
1018 *
1019 * Returns true if the domain is not exceeded quota, false otherwise.
1020 *
1021 * Caller holds tomoyo_read_lock().
1022 */
1023bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
1024{
1025 unsigned int count = 0;
1026 struct tomoyo_domain_info *domain = r->domain;
1027 struct tomoyo_acl_info *ptr;
1028
1029 if (r->mode != TOMOYO_CONFIG_LEARNING)
1030 return false;
1031 if (!domain)
1032 return true;
1033 list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
1034 u16 perm;
1035 u8 i;
1036 if (ptr->is_deleted)
1037 continue;
1038 switch (ptr->type) {
1039 case TOMOYO_TYPE_PATH_ACL:
1040 perm = container_of(ptr, struct tomoyo_path_acl, head)
1041 ->perm;
1042 break;
1043 case TOMOYO_TYPE_PATH2_ACL:
1044 perm = container_of(ptr, struct tomoyo_path2_acl, head)
1045 ->perm;
1046 break;
1047 case TOMOYO_TYPE_PATH_NUMBER_ACL:
1048 perm = container_of(ptr, struct tomoyo_path_number_acl,
1049 head)->perm;
1050 break;
1051 case TOMOYO_TYPE_MKDEV_ACL:
1052 perm = container_of(ptr, struct tomoyo_mkdev_acl,
1053 head)->perm;
1054 break;
1055 case TOMOYO_TYPE_INET_ACL:
1056 perm = container_of(ptr, struct tomoyo_inet_acl,
1057 head)->perm;
1058 break;
1059 case TOMOYO_TYPE_UNIX_ACL:
1060 perm = container_of(ptr, struct tomoyo_unix_acl,
1061 head)->perm;
1062 break;
1063 case TOMOYO_TYPE_MANUAL_TASK_ACL:
1064 perm = 0;
1065 break;
1066 default:
1067 perm = 1;
1068 }
1069 for (i = 0; i < 16; i++)
1070 if (perm & (1 << i))
1071 count++;
1072 }
1073 if (count < tomoyo_profile(domain->ns, domain->profile)->
1074 pref[TOMOYO_PREF_MAX_LEARNING_ENTRY])
1075 return true;
1076 if (!domain->flags[TOMOYO_DIF_QUOTA_WARNED]) {
1077 domain->flags[TOMOYO_DIF_QUOTA_WARNED] = true;
1078 /* r->granted = false; */
1079 tomoyo_write_log(r, "%s", tomoyo_dif[TOMOYO_DIF_QUOTA_WARNED]);
1080 printk(KERN_WARNING "WARNING: "
1081 "Domain '%s' has too many ACLs to hold. "
1082 "Stopped learning mode.\n", domain->domainname->name);
1083 }
1084 return false;
1085}