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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2010-05-16 21:12:46 -0400
committerJames Morris <jmorris@namei.org>2010-08-02 01:33:39 -0400
commitc3ef1500ec833890275172c7d063333404b64d60 (patch)
tree2453368e521a1f7a00098eef06afbedb8404503d /security
parent17fcfbd9d45b57f38d40e31f9d28db53f4af5c88 (diff)
TOMOYO: Split files into some pieces.
security/tomoyo/common.c became too large to read. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
-rw-r--r--security/tomoyo/Makefile2
-rw-r--r--security/tomoyo/common.c1143
-rw-r--r--security/tomoyo/common.h29
-rw-r--r--security/tomoyo/domain.c20
-rw-r--r--security/tomoyo/file.c62
-rw-r--r--security/tomoyo/load_policy.c81
-rw-r--r--security/tomoyo/memory.c236
-rw-r--r--security/tomoyo/realpath.c214
-rw-r--r--security/tomoyo/securityfs_if.c140
-rw-r--r--security/tomoyo/tomoyo.c7
-rw-r--r--security/tomoyo/util.c951
11 files changed, 1469 insertions, 1416 deletions
diff --git a/security/tomoyo/Makefile b/security/tomoyo/Makefile
index d7befab40eff..3aa6f076948e 100644
--- a/security/tomoyo/Makefile
+++ b/security/tomoyo/Makefile
@@ -1 +1 @@
obj-y = common.o realpath.o tomoyo.o domain.o file.o gc.o path_group.o number_group.o mount.o obj-y = common.o domain.o file.o gc.o load_policy.o memory.o mount.o number_group.o path_group.o realpath.o securityfs_if.o tomoyo.o util.o
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index ee46aaa3566f..57ddfc5d9c52 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -3,10 +3,7 @@
3 * 3 *
4 * Common functions for TOMOYO. 4 * Common functions for TOMOYO.
5 * 5 *
6 * Copyright (C) 2005-2009 NTT DATA CORPORATION 6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
7 *
8 * Version: 2.2.0 2009/04/01
9 *
10 */ 7 */
11 8
12#include <linux/uaccess.h> 9#include <linux/uaccess.h>
@@ -15,12 +12,6 @@
15#include <linux/hardirq.h> 12#include <linux/hardirq.h>
16#include "common.h" 13#include "common.h"
17 14
18/* Lock for protecting policy. */
19DEFINE_MUTEX(tomoyo_policy_lock);
20
21/* Has loading policy done? */
22bool tomoyo_policy_loaded;
23
24/* String table for functionality that takes 4 modes. */ 15/* String table for functionality that takes 4 modes. */
25static const char *tomoyo_mode_4[4] = { 16static const char *tomoyo_mode_4[4] = {
26 "disabled", "learning", "permissive", "enforcing" 17 "disabled", "learning", "permissive", "enforcing"
@@ -64,42 +55,6 @@ static bool tomoyo_manage_by_non_root;
64 55
65/* Utility functions. */ 56/* Utility functions. */
66 57
67/* Open operation for /sys/kernel/security/tomoyo/ interface. */
68static int tomoyo_open_control(const u8 type, struct file *file);
69/* Close /sys/kernel/security/tomoyo/ interface. */
70static int tomoyo_close_control(struct file *file);
71/* Read operation for /sys/kernel/security/tomoyo/ interface. */
72static int tomoyo_read_control(struct file *file, char __user *buffer,
73 const int buffer_len);
74/* Write operation for /sys/kernel/security/tomoyo/ interface. */
75static int tomoyo_write_control(struct file *file, const char __user *buffer,
76 const int buffer_len);
77/* Check whether the domain has too many ACL entries to hold. */
78static bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r);
79
80/**
81 * tomoyo_parse_name_union - Parse a tomoyo_name_union.
82 *
83 * @filename: Name or name group.
84 * @ptr: Pointer to "struct tomoyo_name_union".
85 *
86 * Returns true on success, false otherwise.
87 */
88bool tomoyo_parse_name_union(const char *filename,
89 struct tomoyo_name_union *ptr)
90{
91 if (!tomoyo_is_correct_path(filename, 0, 0, 0))
92 return false;
93 if (filename[0] == '@') {
94 ptr->group = tomoyo_get_path_group(filename + 1);
95 ptr->is_group = true;
96 return ptr->group != NULL;
97 }
98 ptr->filename = tomoyo_get_name(filename);
99 ptr->is_group = false;
100 return ptr->filename != NULL;
101}
102
103/** 58/**
104 * tomoyo_print_name_union - Print a tomoyo_name_union. 59 * tomoyo_print_name_union - Print a tomoyo_name_union.
105 * 60 *
@@ -121,69 +76,6 @@ static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head,
121} 76}
122 77
123/** 78/**
124 * tomoyo_parse_ulong - Parse an "unsigned long" value.
125 *
126 * @result: Pointer to "unsigned long".
127 * @str: Pointer to string to parse.
128 *
129 * Returns value type on success, 0 otherwise.
130 *
131 * The @src is updated to point the first character after the value
132 * on success.
133 */
134u8 tomoyo_parse_ulong(unsigned long *result, char **str)
135{
136 const char *cp = *str;
137 char *ep;
138 int base = 10;
139 if (*cp == '0') {
140 char c = *(cp + 1);
141 if (c == 'x' || c == 'X') {
142 base = 16;
143 cp += 2;
144 } else if (c >= '0' && c <= '7') {
145 base = 8;
146 cp++;
147 }
148 }
149 *result = simple_strtoul(cp, &ep, base);
150 if (cp == ep)
151 return 0;
152 *str = ep;
153 switch (base) {
154 case 16:
155 return TOMOYO_VALUE_TYPE_HEXADECIMAL;
156 case 8:
157 return TOMOYO_VALUE_TYPE_OCTAL;
158 default:
159 return TOMOYO_VALUE_TYPE_DECIMAL;
160 }
161}
162
163/**
164 * tomoyo_print_ulong - Print an "unsigned long" value.
165 *
166 * @buffer: Pointer to buffer.
167 * @buffer_len: Size of @buffer.
168 * @value: An "unsigned long" value.
169 * @type: Type of @value.
170 *
171 * Returns nothing.
172 */
173void tomoyo_print_ulong(char *buffer, const int buffer_len,
174 const unsigned long value, const u8 type)
175{
176 if (type == TOMOYO_VALUE_TYPE_DECIMAL)
177 snprintf(buffer, buffer_len, "%lu", value);
178 else if (type == TOMOYO_VALUE_TYPE_OCTAL)
179 snprintf(buffer, buffer_len, "0%lo", value);
180 else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
181 snprintf(buffer, buffer_len, "0x%lX", value);
182 else
183 snprintf(buffer, buffer_len, "type(%u)", type);
184}
185
186/**
187 * tomoyo_print_number_union - Print a tomoyo_number_union. 79 * tomoyo_print_number_union - Print a tomoyo_number_union.
188 * 80 *
189 * @head: Pointer to "struct tomoyo_io_buffer". 81 * @head: Pointer to "struct tomoyo_io_buffer".
@@ -234,704 +126,6 @@ bool tomoyo_print_number_union(struct tomoyo_io_buffer *head,
234} 126}
235 127
236/** 128/**
237 * tomoyo_parse_number_union - Parse a tomoyo_number_union.
238 *
239 * @data: Number or number range or number group.
240 * @ptr: Pointer to "struct tomoyo_number_union".
241 *
242 * Returns true on success, false otherwise.
243 */
244bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num)
245{
246 u8 type;
247 unsigned long v;
248 memset(num, 0, sizeof(*num));
249 if (data[0] == '@') {
250 if (!tomoyo_is_correct_path(data, 0, 0, 0))
251 return false;
252 num->group = tomoyo_get_number_group(data + 1);
253 num->is_group = true;
254 return num->group != NULL;
255 }
256 type = tomoyo_parse_ulong(&v, &data);
257 if (!type)
258 return false;
259 num->values[0] = v;
260 num->min_type = type;
261 if (!*data) {
262 num->values[1] = v;
263 num->max_type = type;
264 return true;
265 }
266 if (*data++ != '-')
267 return false;
268 type = tomoyo_parse_ulong(&v, &data);
269 if (!type || *data)
270 return false;
271 num->values[1] = v;
272 num->max_type = type;
273 return true;
274}
275
276/**
277 * tomoyo_is_byte_range - Check whether the string isa \ooo style octal value.
278 *
279 * @str: Pointer to the string.
280 *
281 * Returns true if @str is a \ooo style octal value, false otherwise.
282 *
283 * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
284 * This function verifies that \ooo is in valid range.
285 */
286static inline bool tomoyo_is_byte_range(const char *str)
287{
288 return *str >= '0' && *str++ <= '3' &&
289 *str >= '0' && *str++ <= '7' &&
290 *str >= '0' && *str <= '7';
291}
292
293/**
294 * tomoyo_is_alphabet_char - Check whether the character is an alphabet.
295 *
296 * @c: The character to check.
297 *
298 * Returns true if @c is an alphabet character, false otherwise.
299 */
300static inline bool tomoyo_is_alphabet_char(const char c)
301{
302 return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
303}
304
305/**
306 * tomoyo_make_byte - Make byte value from three octal characters.
307 *
308 * @c1: The first character.
309 * @c2: The second character.
310 * @c3: The third character.
311 *
312 * Returns byte value.
313 */
314static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
315{
316 return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
317}
318
319/**
320 * tomoyo_str_starts - Check whether the given string starts with the given keyword.
321 *
322 * @src: Pointer to pointer to the string.
323 * @find: Pointer to the keyword.
324 *
325 * Returns true if @src starts with @find, false otherwise.
326 *
327 * The @src is updated to point the first character after the @find
328 * if @src starts with @find.
329 */
330static bool tomoyo_str_starts(char **src, const char *find)
331{
332 const int len = strlen(find);
333 char *tmp = *src;
334
335 if (strncmp(tmp, find, len))
336 return false;
337 tmp += len;
338 *src = tmp;
339 return true;
340}
341
342/**
343 * tomoyo_normalize_line - Format string.
344 *
345 * @buffer: The line to normalize.
346 *
347 * Leading and trailing whitespaces are removed.
348 * Multiple whitespaces are packed into single space.
349 *
350 * Returns nothing.
351 */
352static void tomoyo_normalize_line(unsigned char *buffer)
353{
354 unsigned char *sp = buffer;
355 unsigned char *dp = buffer;
356 bool first = true;
357
358 while (tomoyo_is_invalid(*sp))
359 sp++;
360 while (*sp) {
361 if (!first)
362 *dp++ = ' ';
363 first = false;
364 while (tomoyo_is_valid(*sp))
365 *dp++ = *sp++;
366 while (tomoyo_is_invalid(*sp))
367 sp++;
368 }
369 *dp = '\0';
370}
371
372/**
373 * tomoyo_tokenize - Tokenize string.
374 *
375 * @buffer: The line to tokenize.
376 * @w: Pointer to "char *".
377 * @size: Sizeof @w .
378 *
379 * Returns true on success, false otherwise.
380 */
381bool tomoyo_tokenize(char *buffer, char *w[], size_t size)
382{
383 int count = size / sizeof(char *);
384 int i;
385 for (i = 0; i < count; i++)
386 w[i] = "";
387 for (i = 0; i < count; i++) {
388 char *cp = strchr(buffer, ' ');
389 if (cp)
390 *cp = '\0';
391 w[i] = buffer;
392 if (!cp)
393 break;
394 buffer = cp + 1;
395 }
396 return i < count || !*buffer;
397}
398
399/**
400 * tomoyo_is_correct_path - Validate a pathname.
401 * @filename: The pathname to check.
402 * @start_type: Should the pathname start with '/'?
403 * 1 = must / -1 = must not / 0 = don't care
404 * @pattern_type: Can the pathname contain a wildcard?
405 * 1 = must / -1 = must not / 0 = don't care
406 * @end_type: Should the pathname end with '/'?
407 * 1 = must / -1 = must not / 0 = don't care
408 *
409 * Check whether the given filename follows the naming rules.
410 * Returns true if @filename follows the naming rules, false otherwise.
411 */
412bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
413 const s8 pattern_type, const s8 end_type)
414{
415 const char *const start = filename;
416 bool in_repetition = false;
417 bool contains_pattern = false;
418 unsigned char c;
419 unsigned char d;
420 unsigned char e;
421
422 if (!filename)
423 goto out;
424 c = *filename;
425 if (start_type == 1) { /* Must start with '/' */
426 if (c != '/')
427 goto out;
428 } else if (start_type == -1) { /* Must not start with '/' */
429 if (c == '/')
430 goto out;
431 }
432 if (c)
433 c = *(filename + strlen(filename) - 1);
434 if (end_type == 1) { /* Must end with '/' */
435 if (c != '/')
436 goto out;
437 } else if (end_type == -1) { /* Must not end with '/' */
438 if (c == '/')
439 goto out;
440 }
441 while (1) {
442 c = *filename++;
443 if (!c)
444 break;
445 if (c == '\\') {
446 c = *filename++;
447 switch (c) {
448 case '\\': /* "\\" */
449 continue;
450 case '$': /* "\$" */
451 case '+': /* "\+" */
452 case '?': /* "\?" */
453 case '*': /* "\*" */
454 case '@': /* "\@" */
455 case 'x': /* "\x" */
456 case 'X': /* "\X" */
457 case 'a': /* "\a" */
458 case 'A': /* "\A" */
459 case '-': /* "\-" */
460 if (pattern_type == -1)
461 break; /* Must not contain pattern */
462 contains_pattern = true;
463 continue;
464 case '{': /* "/\{" */
465 if (filename - 3 < start ||
466 *(filename - 3) != '/')
467 break;
468 if (pattern_type == -1)
469 break; /* Must not contain pattern */
470 contains_pattern = true;
471 in_repetition = true;
472 continue;
473 case '}': /* "\}/" */
474 if (*filename != '/')
475 break;
476 if (!in_repetition)
477 break;
478 in_repetition = false;
479 continue;
480 case '0': /* "\ooo" */
481 case '1':
482 case '2':
483 case '3':
484 d = *filename++;
485 if (d < '0' || d > '7')
486 break;
487 e = *filename++;
488 if (e < '0' || e > '7')
489 break;
490 c = tomoyo_make_byte(c, d, e);
491 if (tomoyo_is_invalid(c))
492 continue; /* pattern is not \000 */
493 }
494 goto out;
495 } else if (in_repetition && c == '/') {
496 goto out;
497 } else if (tomoyo_is_invalid(c)) {
498 goto out;
499 }
500 }
501 if (pattern_type == 1) { /* Must contain pattern */
502 if (!contains_pattern)
503 goto out;
504 }
505 if (in_repetition)
506 goto out;
507 return true;
508 out:
509 return false;
510}
511
512/**
513 * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules.
514 * @domainname: The domainname to check.
515 *
516 * Returns true if @domainname follows the naming rules, false otherwise.
517 */
518bool tomoyo_is_correct_domain(const unsigned char *domainname)
519{
520 unsigned char c;
521 unsigned char d;
522 unsigned char e;
523
524 if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
525 TOMOYO_ROOT_NAME_LEN))
526 goto out;
527 domainname += TOMOYO_ROOT_NAME_LEN;
528 if (!*domainname)
529 return true;
530 do {
531 if (*domainname++ != ' ')
532 goto out;
533 if (*domainname++ != '/')
534 goto out;
535 while ((c = *domainname) != '\0' && c != ' ') {
536 domainname++;
537 if (c == '\\') {
538 c = *domainname++;
539 switch ((c)) {
540 case '\\': /* "\\" */
541 continue;
542 case '0': /* "\ooo" */
543 case '1':
544 case '2':
545 case '3':
546 d = *domainname++;
547 if (d < '0' || d > '7')
548 break;
549 e = *domainname++;
550 if (e < '0' || e > '7')
551 break;
552 c = tomoyo_make_byte(c, d, e);
553 if (tomoyo_is_invalid(c))
554 /* pattern is not \000 */
555 continue;
556 }
557 goto out;
558 } else if (tomoyo_is_invalid(c)) {
559 goto out;
560 }
561 }
562 } while (*domainname);
563 return true;
564 out:
565 return false;
566}
567
568/**
569 * tomoyo_is_domain_def - Check whether the given token can be a domainname.
570 *
571 * @buffer: The token to check.
572 *
573 * Returns true if @buffer possibly be a domainname, false otherwise.
574 */
575bool tomoyo_is_domain_def(const unsigned char *buffer)
576{
577 return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN);
578}
579
580/**
581 * tomoyo_find_domain - Find a domain by the given name.
582 *
583 * @domainname: The domainname to find.
584 *
585 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
586 *
587 * Caller holds tomoyo_read_lock().
588 */
589struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
590{
591 struct tomoyo_domain_info *domain;
592 struct tomoyo_path_info name;
593
594 name.name = domainname;
595 tomoyo_fill_path_info(&name);
596 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
597 if (!domain->is_deleted &&
598 !tomoyo_pathcmp(&name, domain->domainname))
599 return domain;
600 }
601 return NULL;
602}
603
604/**
605 * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
606 *
607 * @filename: The string to evaluate.
608 *
609 * Returns the initial length without a pattern in @filename.
610 */
611static int tomoyo_const_part_length(const char *filename)
612{
613 char c;
614 int len = 0;
615
616 if (!filename)
617 return 0;
618 while ((c = *filename++) != '\0') {
619 if (c != '\\') {
620 len++;
621 continue;
622 }
623 c = *filename++;
624 switch (c) {
625 case '\\': /* "\\" */
626 len += 2;
627 continue;
628 case '0': /* "\ooo" */
629 case '1':
630 case '2':
631 case '3':
632 c = *filename++;
633 if (c < '0' || c > '7')
634 break;
635 c = *filename++;
636 if (c < '0' || c > '7')
637 break;
638 len += 4;
639 continue;
640 }
641 break;
642 }
643 return len;
644}
645
646/**
647 * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
648 *
649 * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
650 *
651 * The caller sets "struct tomoyo_path_info"->name.
652 */
653void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
654{
655 const char *name = ptr->name;
656 const int len = strlen(name);
657
658 ptr->const_len = tomoyo_const_part_length(name);
659 ptr->is_dir = len && (name[len - 1] == '/');
660 ptr->is_patterned = (ptr->const_len < len);
661 ptr->hash = full_name_hash(name, len);
662}
663
664/**
665 * tomoyo_file_matches_pattern2 - Pattern matching without '/' character
666 * 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 if (*pattern != '\\') {
683 if (*filename++ != *pattern++)
684 return false;
685 continue;
686 }
687 c = *filename;
688 pattern++;
689 switch (*pattern) {
690 int i;
691 int j;
692 case '?':
693 if (c == '/') {
694 return false;
695 } else if (c == '\\') {
696 if (filename[1] == '\\')
697 filename++;
698 else if (tomoyo_is_byte_range(filename + 1))
699 filename += 3;
700 else
701 return false;
702 }
703 break;
704 case '\\':
705 if (c != '\\')
706 return false;
707 if (*++filename != '\\')
708 return false;
709 break;
710 case '+':
711 if (!isdigit(c))
712 return false;
713 break;
714 case 'x':
715 if (!isxdigit(c))
716 return false;
717 break;
718 case 'a':
719 if (!tomoyo_is_alphabet_char(c))
720 return false;
721 break;
722 case '0':
723 case '1':
724 case '2':
725 case '3':
726 if (c == '\\' && tomoyo_is_byte_range(filename + 1)
727 && strncmp(filename + 1, pattern, 3) == 0) {
728 filename += 3;
729 pattern += 2;
730 break;
731 }
732 return false; /* Not matched. */
733 case '*':
734 case '@':
735 for (i = 0; i <= filename_end - filename; i++) {
736 if (tomoyo_file_matches_pattern2(
737 filename + i, filename_end,
738 pattern + 1, pattern_end))
739 return true;
740 c = filename[i];
741 if (c == '.' && *pattern == '@')
742 break;
743 if (c != '\\')
744 continue;
745 if (filename[i + 1] == '\\')
746 i++;
747 else if (tomoyo_is_byte_range(filename + i + 1))
748 i += 3;
749 else
750 break; /* Bad pattern. */
751 }
752 return false; /* Not matched. */
753 default:
754 j = 0;
755 c = *pattern;
756 if (c == '$') {
757 while (isdigit(filename[j]))
758 j++;
759 } else if (c == 'X') {
760 while (isxdigit(filename[j]))
761 j++;
762 } else if (c == 'A') {
763 while (tomoyo_is_alphabet_char(filename[j]))
764 j++;
765 }
766 for (i = 1; i <= j; i++) {
767 if (tomoyo_file_matches_pattern2(
768 filename + i, filename_end,
769 pattern + 1, pattern_end))
770 return true;
771 }
772 return false; /* Not matched or bad pattern. */
773 }
774 filename++;
775 pattern++;
776 }
777 while (*pattern == '\\' &&
778 (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
779 pattern += 2;
780 return filename == filename_end && pattern == pattern_end;
781}
782
783/**
784 * tomoyo_file_matches_pattern - Pattern matching without without '/' character.
785 *
786 * @filename: The start of string to check.
787 * @filename_end: The end of string to check.
788 * @pattern: The start of pattern to compare.
789 * @pattern_end: The end of pattern to compare.
790 *
791 * Returns true if @filename matches @pattern, false otherwise.
792 */
793static bool tomoyo_file_matches_pattern(const char *filename,
794 const char *filename_end,
795 const char *pattern,
796 const char *pattern_end)
797{
798 const char *pattern_start = pattern;
799 bool first = true;
800 bool result;
801
802 while (pattern < pattern_end - 1) {
803 /* Split at "\-" pattern. */
804 if (*pattern++ != '\\' || *pattern++ != '-')
805 continue;
806 result = tomoyo_file_matches_pattern2(filename,
807 filename_end,
808 pattern_start,
809 pattern - 2);
810 if (first)
811 result = !result;
812 if (result)
813 return false;
814 first = false;
815 pattern_start = pattern;
816 }
817 result = tomoyo_file_matches_pattern2(filename, filename_end,
818 pattern_start, pattern_end);
819 return first ? result : !result;
820}
821
822/**
823 * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
824 *
825 * @f: The start of string to check.
826 * @p: The start of pattern to compare.
827 *
828 * Returns true if @f matches @p, false otherwise.
829 */
830static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
831{
832 const char *f_delimiter;
833 const char *p_delimiter;
834
835 while (*f && *p) {
836 f_delimiter = strchr(f, '/');
837 if (!f_delimiter)
838 f_delimiter = f + strlen(f);
839 p_delimiter = strchr(p, '/');
840 if (!p_delimiter)
841 p_delimiter = p + strlen(p);
842 if (*p == '\\' && *(p + 1) == '{')
843 goto recursive;
844 if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
845 p_delimiter))
846 return false;
847 f = f_delimiter;
848 if (*f)
849 f++;
850 p = p_delimiter;
851 if (*p)
852 p++;
853 }
854 /* Ignore trailing "\*" and "\@" in @pattern. */
855 while (*p == '\\' &&
856 (*(p + 1) == '*' || *(p + 1) == '@'))
857 p += 2;
858 return !*f && !*p;
859 recursive:
860 /*
861 * The "\{" pattern is permitted only after '/' character.
862 * This guarantees that below "*(p - 1)" is safe.
863 * Also, the "\}" pattern is permitted only before '/' character
864 * so that "\{" + "\}" pair will not break the "\-" operator.
865 */
866 if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
867 *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
868 return false; /* Bad pattern. */
869 do {
870 /* Compare current component with pattern. */
871 if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
872 p_delimiter - 2))
873 break;
874 /* Proceed to next component. */
875 f = f_delimiter;
876 if (!*f)
877 break;
878 f++;
879 /* Continue comparison. */
880 if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
881 return true;
882 f_delimiter = strchr(f, '/');
883 } while (f_delimiter);
884 return false; /* Not matched. */
885}
886
887/**
888 * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
889 *
890 * @filename: The filename to check.
891 * @pattern: The pattern to compare.
892 *
893 * Returns true if matches, false otherwise.
894 *
895 * The following patterns are available.
896 * \\ \ itself.
897 * \ooo Octal representation of a byte.
898 * \* Zero or more repetitions of characters other than '/'.
899 * \@ Zero or more repetitions of characters other than '/' or '.'.
900 * \? 1 byte character other than '/'.
901 * \$ One or more repetitions of decimal digits.
902 * \+ 1 decimal digit.
903 * \X One or more repetitions of hexadecimal digits.
904 * \x 1 hexadecimal digit.
905 * \A One or more repetitions of alphabet characters.
906 * \a 1 alphabet character.
907 *
908 * \- Subtraction operator.
909 *
910 * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
911 * /dir/dir/dir/ ).
912 */
913bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
914 const struct tomoyo_path_info *pattern)
915{
916 const char *f = filename->name;
917 const char *p = pattern->name;
918 const int len = pattern->const_len;
919
920 /* If @pattern doesn't contain pattern, I can use strcmp(). */
921 if (!pattern->is_patterned)
922 return !tomoyo_pathcmp(filename, pattern);
923 /* Don't compare directory and non-directory. */
924 if (filename->is_dir != pattern->is_dir)
925 return false;
926 /* Compare the initial length without patterns. */
927 if (strncmp(f, p, len))
928 return false;
929 f += len;
930 p += len;
931 return tomoyo_path_matches_pattern2(f, p);
932}
933
934/**
935 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure. 129 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
936 * 130 *
937 * @head: Pointer to "struct tomoyo_io_buffer". 131 * @head: Pointer to "struct tomoyo_io_buffer".
@@ -960,33 +154,6 @@ bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
960} 154}
961 155
962/** 156/**
963 * tomoyo_get_exe - Get tomoyo_realpath() of current process.
964 *
965 * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
966 *
967 * This function uses kzalloc(), so the caller must call kfree()
968 * if this function didn't return NULL.
969 */
970static const char *tomoyo_get_exe(void)
971{
972 struct mm_struct *mm = current->mm;
973 struct vm_area_struct *vma;
974 const char *cp = NULL;
975
976 if (!mm)
977 return NULL;
978 down_read(&mm->mmap_sem);
979 for (vma = mm->mmap; vma; vma = vma->vm_next) {
980 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
981 cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
982 break;
983 }
984 }
985 up_read(&mm->mmap_sem);
986 return cp;
987}
988
989/**
990 * tomoyo_check_flags - Check mode for specified functionality. 157 * tomoyo_check_flags - Check mode for specified functionality.
991 * 158 *
992 * @domain: Pointer to "struct tomoyo_domain_info". 159 * @domain: Pointer to "struct tomoyo_domain_info".
@@ -1025,76 +192,6 @@ bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain)
1025} 192}
1026 193
1027/** 194/**
1028 * tomoyo_domain_quota_is_ok - Check for domain's quota.
1029 *
1030 * @r: Pointer to "struct tomoyo_request_info".
1031 *
1032 * Returns true if the domain is not exceeded quota, false otherwise.
1033 *
1034 * Caller holds tomoyo_read_lock().
1035 */
1036static bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
1037{
1038 unsigned int count = 0;
1039 struct tomoyo_domain_info *domain = r->domain;
1040 struct tomoyo_acl_info *ptr;
1041
1042 if (r->mode != TOMOYO_CONFIG_LEARNING)
1043 return false;
1044 if (!domain)
1045 return true;
1046 list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
1047 switch (ptr->type) {
1048 u16 perm;
1049 u8 i;
1050 case TOMOYO_TYPE_PATH_ACL:
1051 perm = container_of(ptr, struct tomoyo_path_acl, head)
1052 ->perm;
1053 for (i = 0; i < TOMOYO_MAX_PATH_OPERATION; i++)
1054 if (perm & (1 << i))
1055 count++;
1056 if (perm & (1 << TOMOYO_TYPE_READ_WRITE))
1057 count -= 2;
1058 break;
1059 case TOMOYO_TYPE_PATH2_ACL:
1060 perm = container_of(ptr, struct tomoyo_path2_acl, head)
1061 ->perm;
1062 for (i = 0; i < TOMOYO_MAX_PATH2_OPERATION; i++)
1063 if (perm & (1 << i))
1064 count++;
1065 break;
1066 case TOMOYO_TYPE_PATH_NUMBER_ACL:
1067 perm = container_of(ptr, struct tomoyo_path_number_acl,
1068 head)->perm;
1069 for (i = 0; i < TOMOYO_MAX_PATH_NUMBER_OPERATION; i++)
1070 if (perm & (1 << i))
1071 count++;
1072 break;
1073 case TOMOYO_TYPE_PATH_NUMBER3_ACL:
1074 perm = container_of(ptr, struct tomoyo_path_number3_acl,
1075 head)->perm;
1076 for (i = 0; i < TOMOYO_MAX_PATH_NUMBER3_OPERATION; i++)
1077 if (perm & (1 << i))
1078 count++;
1079 break;
1080 case TOMOYO_TYPE_MOUNT_ACL:
1081 if (!container_of(ptr, struct tomoyo_mount_acl, head)->
1082 is_deleted)
1083 count++;
1084 }
1085 }
1086 if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
1087 return true;
1088 if (!domain->quota_warned) {
1089 domain->quota_warned = true;
1090 printk(KERN_WARNING "TOMOYO-WARNING: "
1091 "Domain '%s' has so many ACLs to hold. "
1092 "Stopped learning mode.\n", domain->domainname->name);
1093 }
1094 return false;
1095}
1096
1097/**
1098 * tomoyo_find_or_assign_new_profile - Create a new profile. 195 * tomoyo_find_or_assign_new_profile - Create a new profile.
1099 * 196 *
1100 * @profile: Profile number to create. 197 * @profile: Profile number to create.
@@ -2118,91 +1215,6 @@ static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
2118 return 0; 1215 return 0;
2119} 1216}
2120 1217
2121/* path to policy loader */
2122static const char *tomoyo_loader = "/sbin/tomoyo-init";
2123
2124/**
2125 * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
2126 *
2127 * Returns true if /sbin/tomoyo-init exists, false otherwise.
2128 */
2129static bool tomoyo_policy_loader_exists(void)
2130{
2131 /*
2132 * Don't activate MAC if the policy loader doesn't exist.
2133 * If the initrd includes /sbin/init but real-root-dev has not
2134 * mounted on / yet, activating MAC will block the system since
2135 * policies are not loaded yet.
2136 * Thus, let do_execve() call this function everytime.
2137 */
2138 struct path path;
2139
2140 if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
2141 printk(KERN_INFO "Not activating Mandatory Access Control now "
2142 "since %s doesn't exist.\n", tomoyo_loader);
2143 return false;
2144 }
2145 path_put(&path);
2146 return true;
2147}
2148
2149/**
2150 * tomoyo_load_policy - Run external policy loader to load policy.
2151 *
2152 * @filename: The program about to start.
2153 *
2154 * This function checks whether @filename is /sbin/init , and if so
2155 * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
2156 * and then continues invocation of /sbin/init.
2157 * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
2158 * writes to /sys/kernel/security/tomoyo/ interfaces.
2159 *
2160 * Returns nothing.
2161 */
2162void tomoyo_load_policy(const char *filename)
2163{
2164 char *argv[2];
2165 char *envp[3];
2166
2167 if (tomoyo_policy_loaded)
2168 return;
2169 /*
2170 * Check filename is /sbin/init or /sbin/tomoyo-start.
2171 * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
2172 * be passed.
2173 * You can create /sbin/tomoyo-start by
2174 * "ln -s /bin/true /sbin/tomoyo-start".
2175 */
2176 if (strcmp(filename, "/sbin/init") &&
2177 strcmp(filename, "/sbin/tomoyo-start"))
2178 return;
2179 if (!tomoyo_policy_loader_exists())
2180 return;
2181
2182 printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
2183 tomoyo_loader);
2184 argv[0] = (char *) tomoyo_loader;
2185 argv[1] = NULL;
2186 envp[0] = "HOME=/";
2187 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
2188 envp[2] = NULL;
2189 call_usermodehelper(argv[0], argv, envp, 1);
2190
2191 printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n");
2192 printk(KERN_INFO "Mandatory Access Control activated.\n");
2193 tomoyo_policy_loaded = true;
2194 { /* Check all profiles currently assigned to domains are defined. */
2195 struct tomoyo_domain_info *domain;
2196 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2197 const u8 profile = domain->profile;
2198 if (tomoyo_profile_ptr[profile])
2199 continue;
2200 panic("Profile %u (used by '%s') not defined.\n",
2201 profile, domain->domainname->name);
2202 }
2203 }
2204}
2205
2206/** 1218/**
2207 * tomoyo_print_header - Get header line of audit log. 1219 * tomoyo_print_header - Get header line of audit log.
2208 * 1220 *
@@ -2601,7 +1613,7 @@ static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
2601 * 1613 *
2602 * Caller acquires tomoyo_read_lock(). 1614 * Caller acquires tomoyo_read_lock().
2603 */ 1615 */
2604static int tomoyo_open_control(const u8 type, struct file *file) 1616int tomoyo_open_control(const u8 type, struct file *file)
2605{ 1617{
2606 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); 1618 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2607 1619
@@ -2744,8 +1756,8 @@ int tomoyo_poll_control(struct file *file, poll_table *wait)
2744 * 1756 *
2745 * Caller holds tomoyo_read_lock(). 1757 * Caller holds tomoyo_read_lock().
2746 */ 1758 */
2747static int tomoyo_read_control(struct file *file, char __user *buffer, 1759int tomoyo_read_control(struct file *file, char __user *buffer,
2748 const int buffer_len) 1760 const int buffer_len)
2749{ 1761{
2750 int len = 0; 1762 int len = 0;
2751 struct tomoyo_io_buffer *head = file->private_data; 1763 struct tomoyo_io_buffer *head = file->private_data;
@@ -2789,8 +1801,8 @@ static int tomoyo_read_control(struct file *file, char __user *buffer,
2789 * 1801 *
2790 * Caller holds tomoyo_read_lock(). 1802 * Caller holds tomoyo_read_lock().
2791 */ 1803 */
2792static int tomoyo_write_control(struct file *file, const char __user *buffer, 1804int tomoyo_write_control(struct file *file, const char __user *buffer,
2793 const int buffer_len) 1805 const int buffer_len)
2794{ 1806{
2795 struct tomoyo_io_buffer *head = file->private_data; 1807 struct tomoyo_io_buffer *head = file->private_data;
2796 int error = buffer_len; 1808 int error = buffer_len;
@@ -2841,7 +1853,7 @@ static int tomoyo_write_control(struct file *file, const char __user *buffer,
2841 * 1853 *
2842 * Caller looses tomoyo_read_lock(). 1854 * Caller looses tomoyo_read_lock().
2843 */ 1855 */
2844static int tomoyo_close_control(struct file *file) 1856int tomoyo_close_control(struct file *file)
2845{ 1857{
2846 struct tomoyo_io_buffer *head = file->private_data; 1858 struct tomoyo_io_buffer *head = file->private_data;
2847 const bool is_write = !!head->write_buf; 1859 const bool is_write = !!head->write_buf;
@@ -2868,131 +1880,22 @@ static int tomoyo_close_control(struct file *file)
2868} 1880}
2869 1881
2870/** 1882/**
2871 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface. 1883 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2872 *
2873 * @inode: Pointer to "struct inode".
2874 * @file: Pointer to "struct file".
2875 *
2876 * Returns 0 on success, negative value otherwise.
2877 */ 1884 */
2878static int tomoyo_open(struct inode *inode, struct file *file) 1885void tomoyo_check_profile(void)
2879{ 1886{
2880 const int key = ((u8 *) file->f_path.dentry->d_inode->i_private) 1887 struct tomoyo_domain_info *domain;
2881 - ((u8 *) NULL); 1888 const int idx = tomoyo_read_lock();
2882 return tomoyo_open_control(key, file); 1889 tomoyo_policy_loaded = true;
2883} 1890 /* Check all profiles currently assigned to domains are defined. */
2884 1891 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2885/** 1892 const u8 profile = domain->profile;
2886 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface. 1893 if (tomoyo_profile_ptr[profile])
2887 * 1894 continue;
2888 * @inode: Pointer to "struct inode". 1895 panic("Profile %u (used by '%s') not defined.\n",
2889 * @file: Pointer to "struct file". 1896 profile, domain->domainname->name);
2890 * 1897 }
2891 * Returns 0 on success, negative value otherwise. 1898 tomoyo_read_unlock(idx);
2892 */ 1899 printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n");
2893static int tomoyo_release(struct inode *inode, struct file *file) 1900 printk(KERN_INFO "Mandatory Access Control activated.\n");
2894{
2895 return tomoyo_close_control(file);
2896}
2897
2898/**
2899 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
2900 *
2901 * @file: Pointer to "struct file".
2902 * @buf: Pointer to buffer.
2903 * @count: Size of @buf.
2904 * @ppos: Unused.
2905 *
2906 * Returns bytes read on success, negative value otherwise.
2907 */
2908static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
2909 loff_t *ppos)
2910{
2911 return tomoyo_read_control(file, buf, count);
2912}
2913
2914/**
2915 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
2916 *
2917 * @file: Pointer to "struct file".
2918 * @buf: Pointer to buffer.
2919 * @count: Size of @buf.
2920 * @ppos: Unused.
2921 *
2922 * Returns @count on success, negative value otherwise.
2923 */
2924static ssize_t tomoyo_write(struct file *file, const char __user *buf,
2925 size_t count, loff_t *ppos)
2926{
2927 return tomoyo_write_control(file, buf, count);
2928}
2929
2930/*
2931 * tomoyo_operations is a "struct file_operations" which is used for handling
2932 * /sys/kernel/security/tomoyo/ interface.
2933 *
2934 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
2935 * See tomoyo_io_buffer for internals.
2936 */
2937static const struct file_operations tomoyo_operations = {
2938 .open = tomoyo_open,
2939 .release = tomoyo_release,
2940 .read = tomoyo_read,
2941 .write = tomoyo_write,
2942};
2943
2944/**
2945 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
2946 *
2947 * @name: The name of the interface file.
2948 * @mode: The permission of the interface file.
2949 * @parent: The parent directory.
2950 * @key: Type of interface.
2951 *
2952 * Returns nothing.
2953 */
2954static void __init tomoyo_create_entry(const char *name, const mode_t mode,
2955 struct dentry *parent, const u8 key)
2956{
2957 securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
2958 &tomoyo_operations);
2959}
2960
2961/**
2962 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
2963 *
2964 * Returns 0.
2965 */
2966static int __init tomoyo_initerface_init(void)
2967{
2968 struct dentry *tomoyo_dir;
2969
2970 /* Don't create securityfs entries unless registered. */
2971 if (current_cred()->security != &tomoyo_kernel_domain)
2972 return 0;
2973
2974 tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
2975 tomoyo_create_entry("query", 0600, tomoyo_dir,
2976 TOMOYO_QUERY);
2977 tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
2978 TOMOYO_DOMAINPOLICY);
2979 tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
2980 TOMOYO_EXCEPTIONPOLICY);
2981 tomoyo_create_entry("self_domain", 0400, tomoyo_dir,
2982 TOMOYO_SELFDOMAIN);
2983 tomoyo_create_entry(".domain_status", 0600, tomoyo_dir,
2984 TOMOYO_DOMAIN_STATUS);
2985 tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
2986 TOMOYO_PROCESS_STATUS);
2987 tomoyo_create_entry("meminfo", 0600, tomoyo_dir,
2988 TOMOYO_MEMINFO);
2989 tomoyo_create_entry("profile", 0600, tomoyo_dir,
2990 TOMOYO_PROFILE);
2991 tomoyo_create_entry("manager", 0600, tomoyo_dir,
2992 TOMOYO_MANAGER);
2993 tomoyo_create_entry("version", 0400, tomoyo_dir,
2994 TOMOYO_VERSION);
2995 return 0;
2996} 1901}
2997
2998fs_initcall(tomoyo_initerface_init);
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index dc5f98f52f61..be03e4a21db0 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -673,6 +673,31 @@ struct tomoyo_policy_manager_entry {
673extern asmlinkage long sys_getpid(void); 673extern asmlinkage long sys_getpid(void);
674extern asmlinkage long sys_getppid(void); 674extern asmlinkage long sys_getppid(void);
675 675
676/* Check whether the given string starts with the given keyword. */
677bool tomoyo_str_starts(char **src, const char *find);
678/* Get tomoyo_realpath() of current process. */
679const char *tomoyo_get_exe(void);
680/* Format string. */
681void tomoyo_normalize_line(unsigned char *buffer);
682/* Print warning or error message on console. */
683void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...)
684 __attribute__ ((format(printf, 2, 3)));
685/* Check all profiles currently assigned to domains are defined. */
686void tomoyo_check_profile(void);
687/* Open operation for /sys/kernel/security/tomoyo/ interface. */
688int tomoyo_open_control(const u8 type, struct file *file);
689/* Close /sys/kernel/security/tomoyo/ interface. */
690int tomoyo_close_control(struct file *file);
691/* Read operation for /sys/kernel/security/tomoyo/ interface. */
692int tomoyo_read_control(struct file *file, char __user *buffer,
693 const int buffer_len);
694/* Write operation for /sys/kernel/security/tomoyo/ interface. */
695int tomoyo_write_control(struct file *file, const char __user *buffer,
696 const int buffer_len);
697/* Check whether the domain has too many ACL entries to hold. */
698bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r);
699/* Print out of memory warning message. */
700void tomoyo_warn_oom(const char *function);
676/* Check whether the given name matches the given name_union. */ 701/* Check whether the given name matches the given name_union. */
677bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, 702bool tomoyo_compare_name_union(const struct tomoyo_path_info *name,
678 const struct tomoyo_name_union *ptr); 703 const struct tomoyo_name_union *ptr);
@@ -837,8 +862,8 @@ int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head);
837/* Set memory quota. */ 862/* Set memory quota. */
838int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head); 863int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head);
839 864
840/* Initialize realpath related code. */ 865/* Initialize mm related code. */
841void __init tomoyo_realpath_init(void); 866void __init tomoyo_mm_init(void);
842int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, 867int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain,
843 const struct tomoyo_path_info *filename); 868 const struct tomoyo_path_info *filename);
844int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, 869int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index 7e242d27da5a..08428bc082df 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -1,12 +1,9 @@
1/* 1/*
2 * security/tomoyo/domain.c 2 * security/tomoyo/domain.c
3 * 3 *
4 * Implementation of the Domain-Based Mandatory Access Control. 4 * Domain transition functions for TOMOYO.
5 *
6 * Copyright (C) 2005-2009 NTT DATA CORPORATION
7 *
8 * Version: 2.2.0 2009/04/01
9 * 5 *
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
10 */ 7 */
11 8
12#include "common.h" 9#include "common.h"
@@ -697,24 +694,11 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
697 struct tomoyo_path_info rn; /* real name */ 694 struct tomoyo_path_info rn; /* real name */
698 struct tomoyo_path_info sn; /* symlink name */ 695 struct tomoyo_path_info sn; /* symlink name */
699 struct tomoyo_path_info ln; /* last name */ 696 struct tomoyo_path_info ln; /* last name */
700 static bool initialized;
701 697
702 tomoyo_init_request_info(&r, NULL); 698 tomoyo_init_request_info(&r, NULL);
703 if (!tmp) 699 if (!tmp)
704 goto out; 700 goto out;
705 701
706 if (!initialized) {
707 /*
708 * Built-in initializers. This is needed because policies are
709 * not loaded until starting /sbin/init.
710 */
711 tomoyo_update_domain_initializer_entry(NULL, "/sbin/hotplug",
712 false, false);
713 tomoyo_update_domain_initializer_entry(NULL, "/sbin/modprobe",
714 false, false);
715 initialized = true;
716 }
717
718 retry: 702 retry:
719 /* Get tomoyo_realpath of program. */ 703 /* Get tomoyo_realpath of program. */
720 retval = -ENOENT; 704 retval = -ENOENT;
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index c629cb4e2c66..c13806937dc6 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -1,12 +1,9 @@
1/* 1/*
2 * security/tomoyo/file.c 2 * security/tomoyo/file.c
3 * 3 *
4 * Implementation of the Domain-Based Mandatory Access Control. 4 * Pathname restriction functions.
5 *
6 * Copyright (C) 2005-2009 NTT DATA CORPORATION
7 *
8 * Version: 2.2.0 2009/04/01
9 * 5 *
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
10 */ 7 */
11 8
12#include "common.h" 9#include "common.h"
@@ -100,61 +97,6 @@ bool tomoyo_compare_number_union(const unsigned long value,
100} 97}
101 98
102/** 99/**
103 * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members.
104 *
105 * @r: Pointer to "struct tomoyo_request_info" to initialize.
106 * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain().
107 *
108 * Returns mode.
109 */
110int tomoyo_init_request_info(struct tomoyo_request_info *r,
111 struct tomoyo_domain_info *domain)
112{
113 memset(r, 0, sizeof(*r));
114 if (!domain)
115 domain = tomoyo_domain();
116 r->domain = domain;
117 r->mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
118 return r->mode;
119}
120
121static void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...)
122 __attribute__ ((format(printf, 2, 3)));
123/**
124 * tomoyo_warn_log - Print warning or error message on console.
125 *
126 * @r: Pointer to "struct tomoyo_request_info".
127 * @fmt: The printf()'s format string, followed by parameters.
128 */
129static void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...)
130{
131 int len = PAGE_SIZE;
132 va_list args;
133 char *buffer;
134 if (!tomoyo_verbose_mode(r->domain))
135 return;
136 while (1) {
137 int len2;
138 buffer = kmalloc(len, GFP_NOFS);
139 if (!buffer)
140 return;
141 va_start(args, fmt);
142 len2 = vsnprintf(buffer, len - 1, fmt, args);
143 va_end(args);
144 if (len2 <= len - 1) {
145 buffer[len2] = '\0';
146 break;
147 }
148 len = len2 + 1;
149 kfree(buffer);
150 }
151 printk(KERN_WARNING "TOMOYO-%s: Access %s denied for %s\n",
152 r->mode == TOMOYO_CONFIG_ENFORCING ? "ERROR" : "WARNING",
153 buffer, tomoyo_get_last_name(r->domain));
154 kfree(buffer);
155}
156
157/**
158 * tomoyo_path2keyword - Get the name of single path operation. 100 * tomoyo_path2keyword - Get the name of single path operation.
159 * 101 *
160 * @operation: Type of operation. 102 * @operation: Type of operation.
diff --git a/security/tomoyo/load_policy.c b/security/tomoyo/load_policy.c
new file mode 100644
index 000000000000..bbada7ca1b91
--- /dev/null
+++ b/security/tomoyo/load_policy.c
@@ -0,0 +1,81 @@
1/*
2 * security/tomoyo/load_policy.c
3 *
4 * Policy loader launcher for TOMOYO.
5 *
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
7 */
8
9#include "common.h"
10
11/* path to policy loader */
12static const char *tomoyo_loader = "/sbin/tomoyo-init";
13
14/**
15 * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
16 *
17 * Returns true if /sbin/tomoyo-init exists, false otherwise.
18 */
19static bool tomoyo_policy_loader_exists(void)
20{
21 /*
22 * Don't activate MAC if the policy loader doesn't exist.
23 * If the initrd includes /sbin/init but real-root-dev has not
24 * mounted on / yet, activating MAC will block the system since
25 * policies are not loaded yet.
26 * Thus, let do_execve() call this function everytime.
27 */
28 struct path path;
29
30 if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
31 printk(KERN_INFO "Not activating Mandatory Access Control now "
32 "since %s doesn't exist.\n", tomoyo_loader);
33 return false;
34 }
35 path_put(&path);
36 return true;
37}
38
39/**
40 * tomoyo_load_policy - Run external policy loader to load policy.
41 *
42 * @filename: The program about to start.
43 *
44 * This function checks whether @filename is /sbin/init , and if so
45 * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
46 * and then continues invocation of /sbin/init.
47 * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
48 * writes to /sys/kernel/security/tomoyo/ interfaces.
49 *
50 * Returns nothing.
51 */
52void tomoyo_load_policy(const char *filename)
53{
54 char *argv[2];
55 char *envp[3];
56
57 if (tomoyo_policy_loaded)
58 return;
59 /*
60 * Check filename is /sbin/init or /sbin/tomoyo-start.
61 * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
62 * be passed.
63 * You can create /sbin/tomoyo-start by
64 * "ln -s /bin/true /sbin/tomoyo-start".
65 */
66 if (strcmp(filename, "/sbin/init") &&
67 strcmp(filename, "/sbin/tomoyo-start"))
68 return;
69 if (!tomoyo_policy_loader_exists())
70 return;
71
72 printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
73 tomoyo_loader);
74 argv[0] = (char *) tomoyo_loader;
75 argv[1] = NULL;
76 envp[0] = "HOME=/";
77 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
78 envp[2] = NULL;
79 call_usermodehelper(argv[0], argv, envp, 1);
80 tomoyo_check_profile();
81}
diff --git a/security/tomoyo/memory.c b/security/tomoyo/memory.c
new file mode 100644
index 000000000000..8fb73ff5cb63
--- /dev/null
+++ b/security/tomoyo/memory.c
@@ -0,0 +1,236 @@
1/*
2 * security/tomoyo/memory.c
3 *
4 * Memory management functions for TOMOYO.
5 *
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
7 */
8
9#include <linux/hash.h>
10#include <linux/slab.h>
11#include "common.h"
12
13/**
14 * tomoyo_warn_oom - Print out of memory warning message.
15 *
16 * @function: Function's name.
17 */
18void tomoyo_warn_oom(const char *function)
19{
20 /* Reduce error messages. */
21 static pid_t tomoyo_last_pid;
22 const pid_t pid = current->pid;
23 if (tomoyo_last_pid != pid) {
24 printk(KERN_WARNING "ERROR: Out of memory at %s.\n",
25 function);
26 tomoyo_last_pid = pid;
27 }
28 if (!tomoyo_policy_loaded)
29 panic("MAC Initialization failed.\n");
30}
31
32/* Memory allocated for policy. */
33static atomic_t tomoyo_policy_memory_size;
34/* Quota for holding policy. */
35static unsigned int tomoyo_quota_for_policy;
36
37/**
38 * tomoyo_memory_ok - Check memory quota.
39 *
40 * @ptr: Pointer to allocated memory.
41 *
42 * Returns true on success, false otherwise.
43 *
44 * Returns true if @ptr is not NULL and quota not exceeded, false otherwise.
45 */
46bool tomoyo_memory_ok(void *ptr)
47{
48 size_t s = ptr ? ksize(ptr) : 0;
49 atomic_add(s, &tomoyo_policy_memory_size);
50 if (ptr && (!tomoyo_quota_for_policy ||
51 atomic_read(&tomoyo_policy_memory_size)
52 <= tomoyo_quota_for_policy)) {
53 memset(ptr, 0, s);
54 return true;
55 }
56 atomic_sub(s, &tomoyo_policy_memory_size);
57 tomoyo_warn_oom(__func__);
58 return false;
59}
60
61/**
62 * tomoyo_commit_ok - Check memory quota.
63 *
64 * @data: Data to copy from.
65 * @size: Size in byte.
66 *
67 * Returns pointer to allocated memory on success, NULL otherwise.
68 * @data is zero-cleared on success.
69 */
70void *tomoyo_commit_ok(void *data, const unsigned int size)
71{
72 void *ptr = kzalloc(size, GFP_NOFS);
73 if (tomoyo_memory_ok(ptr)) {
74 memmove(ptr, data, size);
75 memset(data, 0, size);
76 return ptr;
77 }
78 return NULL;
79}
80
81/**
82 * tomoyo_memory_free - Free memory for elements.
83 *
84 * @ptr: Pointer to allocated memory.
85 */
86void tomoyo_memory_free(void *ptr)
87{
88 atomic_sub(ksize(ptr), &tomoyo_policy_memory_size);
89 kfree(ptr);
90}
91
92/*
93 * tomoyo_name_list is used for holding string data used by TOMOYO.
94 * Since same string data is likely used for multiple times (e.g.
95 * "/lib/libc-2.5.so"), TOMOYO shares string data in the form of
96 * "const struct tomoyo_path_info *".
97 */
98struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
99
100/**
101 * tomoyo_get_name - Allocate permanent memory for string data.
102 *
103 * @name: The string to store into the permernent memory.
104 *
105 * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
106 */
107const struct tomoyo_path_info *tomoyo_get_name(const char *name)
108{
109 struct tomoyo_name_entry *ptr;
110 unsigned int hash;
111 int len;
112 int allocated_len;
113 struct list_head *head;
114
115 if (!name)
116 return NULL;
117 len = strlen(name) + 1;
118 hash = full_name_hash((const unsigned char *) name, len - 1);
119 head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)];
120 if (mutex_lock_interruptible(&tomoyo_policy_lock))
121 return NULL;
122 list_for_each_entry(ptr, head, list) {
123 if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name))
124 continue;
125 atomic_inc(&ptr->users);
126 goto out;
127 }
128 ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS);
129 allocated_len = ptr ? ksize(ptr) : 0;
130 if (!ptr || (tomoyo_quota_for_policy &&
131 atomic_read(&tomoyo_policy_memory_size) + allocated_len
132 > tomoyo_quota_for_policy)) {
133 kfree(ptr);
134 ptr = NULL;
135 tomoyo_warn_oom(__func__);
136 goto out;
137 }
138 atomic_add(allocated_len, &tomoyo_policy_memory_size);
139 ptr->entry.name = ((char *) ptr) + sizeof(*ptr);
140 memmove((char *) ptr->entry.name, name, len);
141 atomic_set(&ptr->users, 1);
142 tomoyo_fill_path_info(&ptr->entry);
143 list_add_tail(&ptr->list, head);
144 out:
145 mutex_unlock(&tomoyo_policy_lock);
146 return ptr ? &ptr->entry : NULL;
147}
148
149/**
150 * tomoyo_mm_init - Initialize mm related code.
151 */
152void __init tomoyo_mm_init(void)
153{
154 int idx;
155
156 BUILD_BUG_ON(TOMOYO_MAX_PATHNAME_LEN > PATH_MAX);
157 for (idx = 0; idx < TOMOYO_MAX_HASH; idx++)
158 INIT_LIST_HEAD(&tomoyo_name_list[idx]);
159 INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list);
160 tomoyo_kernel_domain.domainname = tomoyo_get_name(TOMOYO_ROOT_NAME);
161 list_add_tail_rcu(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
162 idx = tomoyo_read_lock();
163 if (tomoyo_find_domain(TOMOYO_ROOT_NAME) != &tomoyo_kernel_domain)
164 panic("Can't register tomoyo_kernel_domain");
165 {
166 /* Load built-in policy. */
167 tomoyo_write_domain_initializer_policy("/sbin/hotplug",
168 false, false);
169 tomoyo_write_domain_initializer_policy("/sbin/modprobe",
170 false, false);
171 }
172 tomoyo_read_unlock(idx);
173}
174
175
176/* Memory allocated for query lists. */
177unsigned int tomoyo_query_memory_size;
178/* Quota for holding query lists. */
179unsigned int tomoyo_quota_for_query;
180
181/**
182 * tomoyo_read_memory_counter - Check for memory usage in bytes.
183 *
184 * @head: Pointer to "struct tomoyo_io_buffer".
185 *
186 * Returns memory usage.
187 */
188int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head)
189{
190 if (!head->read_eof) {
191 const unsigned int policy
192 = atomic_read(&tomoyo_policy_memory_size);
193 const unsigned int query = tomoyo_query_memory_size;
194 char buffer[64];
195
196 memset(buffer, 0, sizeof(buffer));
197 if (tomoyo_quota_for_policy)
198 snprintf(buffer, sizeof(buffer) - 1,
199 " (Quota: %10u)",
200 tomoyo_quota_for_policy);
201 else
202 buffer[0] = '\0';
203 tomoyo_io_printf(head, "Policy: %10u%s\n", policy,
204 buffer);
205 if (tomoyo_quota_for_query)
206 snprintf(buffer, sizeof(buffer) - 1,
207 " (Quota: %10u)",
208 tomoyo_quota_for_query);
209 else
210 buffer[0] = '\0';
211 tomoyo_io_printf(head, "Query lists: %10u%s\n", query,
212 buffer);
213 tomoyo_io_printf(head, "Total: %10u\n", policy + query);
214 head->read_eof = true;
215 }
216 return 0;
217}
218
219/**
220 * tomoyo_write_memory_quota - Set memory quota.
221 *
222 * @head: Pointer to "struct tomoyo_io_buffer".
223 *
224 * Returns 0.
225 */
226int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head)
227{
228 char *data = head->write_buf;
229 unsigned int size;
230
231 if (sscanf(data, "Policy: %u", &size) == 1)
232 tomoyo_quota_for_policy = size;
233 else if (sscanf(data, "Query lists: %u", &size) == 1)
234 tomoyo_quota_for_query = size;
235 return 0;
236}
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index 3ceb1724c92d..1fd685a94ad1 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -1,19 +1,15 @@
1/* 1/*
2 * security/tomoyo/realpath.c 2 * security/tomoyo/realpath.c
3 * 3 *
4 * Get the canonicalized absolute pathnames. The basis for TOMOYO. 4 * Pathname calculation functions for TOMOYO.
5 *
6 * Copyright (C) 2005-2009 NTT DATA CORPORATION
7 *
8 * Version: 2.2.0 2009/04/01
9 * 5 *
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
10 */ 7 */
11 8
12#include <linux/types.h> 9#include <linux/types.h>
13#include <linux/mount.h> 10#include <linux/mount.h>
14#include <linux/mnt_namespace.h> 11#include <linux/mnt_namespace.h>
15#include <linux/fs_struct.h> 12#include <linux/fs_struct.h>
16#include <linux/hash.h>
17#include <linux/magic.h> 13#include <linux/magic.h>
18#include <linux/slab.h> 14#include <linux/slab.h>
19#include "common.h" 15#include "common.h"
@@ -123,7 +119,7 @@ int tomoyo_realpath_from_path2(struct path *path, char *newname,
123 } 119 }
124 } 120 }
125 if (error) 121 if (error)
126 printk(KERN_WARNING "tomoyo_realpath: Pathname too long.\n"); 122 tomoyo_warn_oom(__func__);
127 return error; 123 return error;
128} 124}
129 125
@@ -141,6 +137,7 @@ char *tomoyo_realpath_from_path(struct path *path)
141{ 137{
142 char *buf = kzalloc(sizeof(struct tomoyo_page_buffer), GFP_NOFS); 138 char *buf = kzalloc(sizeof(struct tomoyo_page_buffer), GFP_NOFS);
143 139
140 BUILD_BUG_ON(TOMOYO_MAX_PATHNAME_LEN > PATH_MAX);
144 BUILD_BUG_ON(sizeof(struct tomoyo_page_buffer) 141 BUILD_BUG_ON(sizeof(struct tomoyo_page_buffer)
145 <= TOMOYO_MAX_PATHNAME_LEN - 1); 142 <= TOMOYO_MAX_PATHNAME_LEN - 1);
146 if (!buf) 143 if (!buf)
@@ -189,206 +186,3 @@ char *tomoyo_realpath_nofollow(const char *pathname)
189 } 186 }
190 return NULL; 187 return NULL;
191} 188}
192
193/* Memory allocated for non-string data. */
194static atomic_t tomoyo_policy_memory_size;
195/* Quota for holding policy. */
196static unsigned int tomoyo_quota_for_policy;
197
198/**
199 * tomoyo_memory_ok - Check memory quota.
200 *
201 * @ptr: Pointer to allocated memory.
202 *
203 * Returns true on success, false otherwise.
204 *
205 * Caller holds tomoyo_policy_lock.
206 * Memory pointed by @ptr will be zeroed on success.
207 */
208bool tomoyo_memory_ok(void *ptr)
209{
210 int allocated_len = ptr ? ksize(ptr) : 0;
211 atomic_add(allocated_len, &tomoyo_policy_memory_size);
212 if (ptr && (!tomoyo_quota_for_policy ||
213 atomic_read(&tomoyo_policy_memory_size)
214 <= tomoyo_quota_for_policy)) {
215 memset(ptr, 0, allocated_len);
216 return true;
217 }
218 printk(KERN_WARNING "ERROR: Out of memory "
219 "for tomoyo_alloc_element().\n");
220 if (!tomoyo_policy_loaded)
221 panic("MAC Initialization failed.\n");
222 return false;
223}
224
225/**
226 * tomoyo_commit_ok - Check memory quota.
227 *
228 * @data: Data to copy from.
229 * @size: Size in byte.
230 *
231 * Returns pointer to allocated memory on success, NULL otherwise.
232 */
233void *tomoyo_commit_ok(void *data, const unsigned int size)
234{
235 void *ptr = kzalloc(size, GFP_NOFS);
236 if (tomoyo_memory_ok(ptr)) {
237 memmove(ptr, data, size);
238 memset(data, 0, size);
239 return ptr;
240 }
241 return NULL;
242}
243
244/**
245 * tomoyo_memory_free - Free memory for elements.
246 *
247 * @ptr: Pointer to allocated memory.
248 */
249void tomoyo_memory_free(void *ptr)
250{
251 atomic_sub(ksize(ptr), &tomoyo_policy_memory_size);
252 kfree(ptr);
253}
254
255/*
256 * tomoyo_name_list is used for holding string data used by TOMOYO.
257 * Since same string data is likely used for multiple times (e.g.
258 * "/lib/libc-2.5.so"), TOMOYO shares string data in the form of
259 * "const struct tomoyo_path_info *".
260 */
261struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
262
263/**
264 * tomoyo_get_name - Allocate permanent memory for string data.
265 *
266 * @name: The string to store into the permernent memory.
267 *
268 * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
269 */
270const struct tomoyo_path_info *tomoyo_get_name(const char *name)
271{
272 struct tomoyo_name_entry *ptr;
273 unsigned int hash;
274 int len;
275 int allocated_len;
276 struct list_head *head;
277
278 if (!name)
279 return NULL;
280 len = strlen(name) + 1;
281 hash = full_name_hash((const unsigned char *) name, len - 1);
282 head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)];
283 if (mutex_lock_interruptible(&tomoyo_policy_lock))
284 return NULL;
285 list_for_each_entry(ptr, head, list) {
286 if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name))
287 continue;
288 atomic_inc(&ptr->users);
289 goto out;
290 }
291 ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS);
292 allocated_len = ptr ? ksize(ptr) : 0;
293 if (!ptr || (tomoyo_quota_for_policy &&
294 atomic_read(&tomoyo_policy_memory_size) + allocated_len
295 > tomoyo_quota_for_policy)) {
296 kfree(ptr);
297 printk(KERN_WARNING "ERROR: Out of memory "
298 "for tomoyo_get_name().\n");
299 if (!tomoyo_policy_loaded)
300 panic("MAC Initialization failed.\n");
301 ptr = NULL;
302 goto out;
303 }
304 atomic_add(allocated_len, &tomoyo_policy_memory_size);
305 ptr->entry.name = ((char *) ptr) + sizeof(*ptr);
306 memmove((char *) ptr->entry.name, name, len);
307 atomic_set(&ptr->users, 1);
308 tomoyo_fill_path_info(&ptr->entry);
309 list_add_tail(&ptr->list, head);
310 out:
311 mutex_unlock(&tomoyo_policy_lock);
312 return ptr ? &ptr->entry : NULL;
313}
314
315/**
316 * tomoyo_realpath_init - Initialize realpath related code.
317 */
318void __init tomoyo_realpath_init(void)
319{
320 int i;
321
322 BUILD_BUG_ON(TOMOYO_MAX_PATHNAME_LEN > PATH_MAX);
323 for (i = 0; i < TOMOYO_MAX_HASH; i++)
324 INIT_LIST_HEAD(&tomoyo_name_list[i]);
325 INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list);
326 tomoyo_kernel_domain.domainname = tomoyo_get_name(TOMOYO_ROOT_NAME);
327 /*
328 * tomoyo_read_lock() is not needed because this function is
329 * called before the first "delete" request.
330 */
331 list_add_tail_rcu(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
332 if (tomoyo_find_domain(TOMOYO_ROOT_NAME) != &tomoyo_kernel_domain)
333 panic("Can't register tomoyo_kernel_domain");
334}
335
336unsigned int tomoyo_quota_for_query;
337unsigned int tomoyo_query_memory_size;
338
339/**
340 * tomoyo_read_memory_counter - Check for memory usage in bytes.
341 *
342 * @head: Pointer to "struct tomoyo_io_buffer".
343 *
344 * Returns memory usage.
345 */
346int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head)
347{
348 if (!head->read_eof) {
349 const unsigned int policy
350 = atomic_read(&tomoyo_policy_memory_size);
351 const unsigned int query = tomoyo_query_memory_size;
352 char buffer[64];
353
354 memset(buffer, 0, sizeof(buffer));
355 if (tomoyo_quota_for_policy)
356 snprintf(buffer, sizeof(buffer) - 1,
357 " (Quota: %10u)",
358 tomoyo_quota_for_policy);
359 else
360 buffer[0] = '\0';
361 tomoyo_io_printf(head, "Policy: %10u%s\n", policy,
362 buffer);
363 if (tomoyo_quota_for_query)
364 snprintf(buffer, sizeof(buffer) - 1,
365 " (Quota: %10u)",
366 tomoyo_quota_for_query);
367 else
368 buffer[0] = '\0';
369 tomoyo_io_printf(head, "Query lists: %10u%s\n", query,
370 buffer);
371 tomoyo_io_printf(head, "Total: %10u\n", policy + query);
372 head->read_eof = true;
373 }
374 return 0;
375}
376
377/**
378 * tomoyo_write_memory_quota - Set memory quota.
379 *
380 * @head: Pointer to "struct tomoyo_io_buffer".
381 *
382 * Returns 0.
383 */
384int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head)
385{
386 char *data = head->write_buf;
387 unsigned int size;
388
389 if (sscanf(data, "Policy: %u", &size) == 1)
390 tomoyo_quota_for_policy = size;
391 else if (sscanf(data, "Query lists: %u", &size) == 1)
392 tomoyo_quota_for_query = size;
393 return 0;
394}
diff --git a/security/tomoyo/securityfs_if.c b/security/tomoyo/securityfs_if.c
new file mode 100644
index 000000000000..5eb53510c4a7
--- /dev/null
+++ b/security/tomoyo/securityfs_if.c
@@ -0,0 +1,140 @@
1/*
2 * security/tomoyo/common.c
3 *
4 * Securityfs interface for TOMOYO.
5 *
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
7 */
8
9#include <linux/security.h>
10#include "common.h"
11
12/**
13 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
14 *
15 * @inode: Pointer to "struct inode".
16 * @file: Pointer to "struct file".
17 *
18 * Returns 0 on success, negative value otherwise.
19 */
20static int tomoyo_open(struct inode *inode, struct file *file)
21{
22 const int key = ((u8 *) file->f_path.dentry->d_inode->i_private)
23 - ((u8 *) NULL);
24 return tomoyo_open_control(key, file);
25}
26
27/**
28 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
29 *
30 * @inode: Pointer to "struct inode".
31 * @file: Pointer to "struct file".
32 *
33 * Returns 0 on success, negative value otherwise.
34 */
35static int tomoyo_release(struct inode *inode, struct file *file)
36{
37 return tomoyo_close_control(file);
38}
39
40/**
41 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
42 *
43 * @file: Pointer to "struct file".
44 * @buf: Pointer to buffer.
45 * @count: Size of @buf.
46 * @ppos: Unused.
47 *
48 * Returns bytes read on success, negative value otherwise.
49 */
50static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
51 loff_t *ppos)
52{
53 return tomoyo_read_control(file, buf, count);
54}
55
56/**
57 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
58 *
59 * @file: Pointer to "struct file".
60 * @buf: Pointer to buffer.
61 * @count: Size of @buf.
62 * @ppos: Unused.
63 *
64 * Returns @count on success, negative value otherwise.
65 */
66static ssize_t tomoyo_write(struct file *file, const char __user *buf,
67 size_t count, loff_t *ppos)
68{
69 return tomoyo_write_control(file, buf, count);
70}
71
72/*
73 * tomoyo_operations is a "struct file_operations" which is used for handling
74 * /sys/kernel/security/tomoyo/ interface.
75 *
76 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
77 * See tomoyo_io_buffer for internals.
78 */
79static const struct file_operations tomoyo_operations = {
80 .open = tomoyo_open,
81 .release = tomoyo_release,
82 .read = tomoyo_read,
83 .write = tomoyo_write,
84};
85
86/**
87 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
88 *
89 * @name: The name of the interface file.
90 * @mode: The permission of the interface file.
91 * @parent: The parent directory.
92 * @key: Type of interface.
93 *
94 * Returns nothing.
95 */
96static void __init tomoyo_create_entry(const char *name, const mode_t mode,
97 struct dentry *parent, const u8 key)
98{
99 securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
100 &tomoyo_operations);
101}
102
103/**
104 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
105 *
106 * Returns 0.
107 */
108static int __init tomoyo_initerface_init(void)
109{
110 struct dentry *tomoyo_dir;
111
112 /* Don't create securityfs entries unless registered. */
113 if (current_cred()->security != &tomoyo_kernel_domain)
114 return 0;
115
116 tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
117 tomoyo_create_entry("query", 0600, tomoyo_dir,
118 TOMOYO_QUERY);
119 tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
120 TOMOYO_DOMAINPOLICY);
121 tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
122 TOMOYO_EXCEPTIONPOLICY);
123 tomoyo_create_entry("self_domain", 0400, tomoyo_dir,
124 TOMOYO_SELFDOMAIN);
125 tomoyo_create_entry(".domain_status", 0600, tomoyo_dir,
126 TOMOYO_DOMAIN_STATUS);
127 tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
128 TOMOYO_PROCESS_STATUS);
129 tomoyo_create_entry("meminfo", 0600, tomoyo_dir,
130 TOMOYO_MEMINFO);
131 tomoyo_create_entry("profile", 0600, tomoyo_dir,
132 TOMOYO_PROFILE);
133 tomoyo_create_entry("manager", 0600, tomoyo_dir,
134 TOMOYO_MANAGER);
135 tomoyo_create_entry("version", 0400, tomoyo_dir,
136 TOMOYO_VERSION);
137 return 0;
138}
139
140fs_initcall(tomoyo_initerface_init);
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index 5d64d409b112..57d442e7339b 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -3,10 +3,7 @@
3 * 3 *
4 * LSM hooks for TOMOYO Linux. 4 * LSM hooks for TOMOYO Linux.
5 * 5 *
6 * Copyright (C) 2005-2009 NTT DATA CORPORATION 6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
7 *
8 * Version: 2.2.0 2009/04/01
9 *
10 */ 7 */
11 8
12#include <linux/security.h> 9#include <linux/security.h>
@@ -286,7 +283,7 @@ static int __init tomoyo_init(void)
286 panic("Failure registering TOMOYO Linux"); 283 panic("Failure registering TOMOYO Linux");
287 printk(KERN_INFO "TOMOYO Linux initialized\n"); 284 printk(KERN_INFO "TOMOYO Linux initialized\n");
288 cred->security = &tomoyo_kernel_domain; 285 cred->security = &tomoyo_kernel_domain;
289 tomoyo_realpath_init(); 286 tomoyo_mm_init();
290 return 0; 287 return 0;
291} 288}
292 289
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
new file mode 100644
index 000000000000..7b023f5e1314
--- /dev/null
+++ b/security/tomoyo/util.c
@@ -0,0 +1,951 @@
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. */
13DEFINE_MUTEX(tomoyo_policy_lock);
14
15/* Has /sbin/init started? */
16bool tomoyo_policy_loaded;
17
18/**
19 * tomoyo_parse_ulong - Parse an "unsigned long" value.
20 *
21 * @result: Pointer to "unsigned long".
22 * @str: Pointer to string to parse.
23 *
24 * Returns value type on success, 0 otherwise.
25 *
26 * The @src is updated to point the first character after the value
27 * on success.
28 */
29u8 tomoyo_parse_ulong(unsigned long *result, char **str)
30{
31 const char *cp = *str;
32 char *ep;
33 int base = 10;
34 if (*cp == '0') {
35 char c = *(cp + 1);
36 if (c == 'x' || c == 'X') {
37 base = 16;
38 cp += 2;
39 } else if (c >= '0' && c <= '7') {
40 base = 8;
41 cp++;
42 }
43 }
44 *result = simple_strtoul(cp, &ep, base);
45 if (cp == ep)
46 return 0;
47 *str = ep;
48 switch (base) {
49 case 16:
50 return TOMOYO_VALUE_TYPE_HEXADECIMAL;
51 case 8:
52 return TOMOYO_VALUE_TYPE_OCTAL;
53 default:
54 return TOMOYO_VALUE_TYPE_DECIMAL;
55 }
56}
57
58/**
59 * tomoyo_print_ulong - Print an "unsigned long" value.
60 *
61 * @buffer: Pointer to buffer.
62 * @buffer_len: Size of @buffer.
63 * @value: An "unsigned long" value.
64 * @type: Type of @value.
65 *
66 * Returns nothing.
67 */
68void tomoyo_print_ulong(char *buffer, const int buffer_len,
69 const unsigned long value, const u8 type)
70{
71 if (type == TOMOYO_VALUE_TYPE_DECIMAL)
72 snprintf(buffer, buffer_len, "%lu", value);
73 else if (type == TOMOYO_VALUE_TYPE_OCTAL)
74 snprintf(buffer, buffer_len, "0%lo", value);
75 else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
76 snprintf(buffer, buffer_len, "0x%lX", value);
77 else
78 snprintf(buffer, buffer_len, "type(%u)", type);
79}
80
81/**
82 * tomoyo_parse_name_union - Parse a tomoyo_name_union.
83 *
84 * @filename: Name or name group.
85 * @ptr: Pointer to "struct tomoyo_name_union".
86 *
87 * Returns true on success, false otherwise.
88 */
89bool tomoyo_parse_name_union(const char *filename,
90 struct tomoyo_name_union *ptr)
91{
92 if (!tomoyo_is_correct_path(filename, 0, 0, 0))
93 return false;
94 if (filename[0] == '@') {
95 ptr->group = tomoyo_get_path_group(filename + 1);
96 ptr->is_group = true;
97 return ptr->group != NULL;
98 }
99 ptr->filename = tomoyo_get_name(filename);
100 ptr->is_group = false;
101 return ptr->filename != NULL;
102}
103
104/**
105 * tomoyo_parse_number_union - Parse a tomoyo_number_union.
106 *
107 * @data: Number or number range or number group.
108 * @ptr: Pointer to "struct tomoyo_number_union".
109 *
110 * Returns true on success, false otherwise.
111 */
112bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num)
113{
114 u8 type;
115 unsigned long v;
116 memset(num, 0, sizeof(*num));
117 if (data[0] == '@') {
118 if (!tomoyo_is_correct_path(data, 0, 0, 0))
119 return false;
120 num->group = tomoyo_get_number_group(data + 1);
121 num->is_group = true;
122 return num->group != NULL;
123 }
124 type = tomoyo_parse_ulong(&v, &data);
125 if (!type)
126 return false;
127 num->values[0] = v;
128 num->min_type = type;
129 if (!*data) {
130 num->values[1] = v;
131 num->max_type = type;
132 return true;
133 }
134 if (*data++ != '-')
135 return false;
136 type = tomoyo_parse_ulong(&v, &data);
137 if (!type || *data)
138 return false;
139 num->values[1] = v;
140 num->max_type = type;
141 return true;
142}
143
144/**
145 * tomoyo_is_byte_range - Check whether the string is a \ooo style octal value.
146 *
147 * @str: Pointer to the string.
148 *
149 * Returns true if @str is a \ooo style octal value, false otherwise.
150 *
151 * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
152 * This function verifies that \ooo is in valid range.
153 */
154static inline bool tomoyo_is_byte_range(const char *str)
155{
156 return *str >= '0' && *str++ <= '3' &&
157 *str >= '0' && *str++ <= '7' &&
158 *str >= '0' && *str <= '7';
159}
160
161/**
162 * tomoyo_is_alphabet_char - Check whether the character is an alphabet.
163 *
164 * @c: The character to check.
165 *
166 * Returns true if @c is an alphabet character, false otherwise.
167 */
168static inline bool tomoyo_is_alphabet_char(const char c)
169{
170 return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
171}
172
173/**
174 * tomoyo_make_byte - Make byte value from three octal characters.
175 *
176 * @c1: The first character.
177 * @c2: The second character.
178 * @c3: The third character.
179 *
180 * Returns byte value.
181 */
182static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
183{
184 return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
185}
186
187/**
188 * tomoyo_str_starts - Check whether the given string starts with the given keyword.
189 *
190 * @src: Pointer to pointer to the string.
191 * @find: Pointer to the keyword.
192 *
193 * Returns true if @src starts with @find, false otherwise.
194 *
195 * The @src is updated to point the first character after the @find
196 * if @src starts with @find.
197 */
198bool tomoyo_str_starts(char **src, const char *find)
199{
200 const int len = strlen(find);
201 char *tmp = *src;
202
203 if (strncmp(tmp, find, len))
204 return false;
205 tmp += len;
206 *src = tmp;
207 return true;
208}
209
210/**
211 * tomoyo_normalize_line - Format string.
212 *
213 * @buffer: The line to normalize.
214 *
215 * Leading and trailing whitespaces are removed.
216 * Multiple whitespaces are packed into single space.
217 *
218 * Returns nothing.
219 */
220void tomoyo_normalize_line(unsigned char *buffer)
221{
222 unsigned char *sp = buffer;
223 unsigned char *dp = buffer;
224 bool first = true;
225
226 while (tomoyo_is_invalid(*sp))
227 sp++;
228 while (*sp) {
229 if (!first)
230 *dp++ = ' ';
231 first = false;
232 while (tomoyo_is_valid(*sp))
233 *dp++ = *sp++;
234 while (tomoyo_is_invalid(*sp))
235 sp++;
236 }
237 *dp = '\0';
238}
239
240/**
241 * tomoyo_tokenize - Tokenize string.
242 *
243 * @buffer: The line to tokenize.
244 * @w: Pointer to "char *".
245 * @size: Sizeof @w .
246 *
247 * Returns true on success, false otherwise.
248 */
249bool tomoyo_tokenize(char *buffer, char *w[], size_t size)
250{
251 int count = size / sizeof(char *);
252 int i;
253 for (i = 0; i < count; i++)
254 w[i] = "";
255 for (i = 0; i < count; i++) {
256 char *cp = strchr(buffer, ' ');
257 if (cp)
258 *cp = '\0';
259 w[i] = buffer;
260 if (!cp)
261 break;
262 buffer = cp + 1;
263 }
264 return i < count || !*buffer;
265}
266
267/**
268 * tomoyo_is_correct_path - Validate a pathname.
269 *
270 * @filename: The pathname to check.
271 * @start_type: Should the pathname start with '/'?
272 * 1 = must / -1 = must not / 0 = don't care
273 * @pattern_type: Can the pathname contain a wildcard?
274 * 1 = must / -1 = must not / 0 = don't care
275 * @end_type: Should the pathname end with '/'?
276 * 1 = must / -1 = must not / 0 = don't care
277 *
278 * Check whether the given filename follows the naming rules.
279 * Returns true if @filename follows the naming rules, false otherwise.
280 */
281bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
282 const s8 pattern_type, const s8 end_type)
283{
284 const char *const start = filename;
285 bool in_repetition = false;
286 bool contains_pattern = false;
287 unsigned char c;
288 unsigned char d;
289 unsigned char e;
290
291 if (!filename)
292 goto out;
293 c = *filename;
294 if (start_type == 1) { /* Must start with '/' */
295 if (c != '/')
296 goto out;
297 } else if (start_type == -1) { /* Must not start with '/' */
298 if (c == '/')
299 goto out;
300 }
301 if (c)
302 c = *(filename + strlen(filename) - 1);
303 if (end_type == 1) { /* Must end with '/' */
304 if (c != '/')
305 goto out;
306 } else if (end_type == -1) { /* Must not end with '/' */
307 if (c == '/')
308 goto out;
309 }
310 while (1) {
311 c = *filename++;
312 if (!c)
313 break;
314 if (c == '\\') {
315 c = *filename++;
316 switch (c) {
317 case '\\': /* "\\" */
318 continue;
319 case '$': /* "\$" */
320 case '+': /* "\+" */
321 case '?': /* "\?" */
322 case '*': /* "\*" */
323 case '@': /* "\@" */
324 case 'x': /* "\x" */
325 case 'X': /* "\X" */
326 case 'a': /* "\a" */
327 case 'A': /* "\A" */
328 case '-': /* "\-" */
329 if (pattern_type == -1)
330 break; /* Must not contain pattern */
331 contains_pattern = true;
332 continue;
333 case '{': /* "/\{" */
334 if (filename - 3 < start ||
335 *(filename - 3) != '/')
336 break;
337 if (pattern_type == -1)
338 break; /* Must not contain pattern */
339 contains_pattern = true;
340 in_repetition = true;
341 continue;
342 case '}': /* "\}/" */
343 if (*filename != '/')
344 break;
345 if (!in_repetition)
346 break;
347 in_repetition = false;
348 continue;
349 case '0': /* "\ooo" */
350 case '1':
351 case '2':
352 case '3':
353 d = *filename++;
354 if (d < '0' || d > '7')
355 break;
356 e = *filename++;
357 if (e < '0' || e > '7')
358 break;
359 c = tomoyo_make_byte(c, d, e);
360 if (tomoyo_is_invalid(c))
361 continue; /* pattern is not \000 */
362 }
363 goto out;
364 } else if (in_repetition && c == '/') {
365 goto out;
366 } else if (tomoyo_is_invalid(c)) {
367 goto out;
368 }
369 }
370 if (pattern_type == 1) { /* Must contain pattern */
371 if (!contains_pattern)
372 goto out;
373 }
374 if (in_repetition)
375 goto out;
376 return true;
377 out:
378 return false;
379}
380
381/**
382 * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules.
383 *
384 * @domainname: The domainname to check.
385 *
386 * Returns true if @domainname follows the naming rules, false otherwise.
387 */
388bool tomoyo_is_correct_domain(const unsigned char *domainname)
389{
390 unsigned char c;
391 unsigned char d;
392 unsigned char e;
393
394 if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
395 TOMOYO_ROOT_NAME_LEN))
396 goto out;
397 domainname += TOMOYO_ROOT_NAME_LEN;
398 if (!*domainname)
399 return true;
400 do {
401 if (*domainname++ != ' ')
402 goto out;
403 if (*domainname++ != '/')
404 goto out;
405 while ((c = *domainname) != '\0' && c != ' ') {
406 domainname++;
407 if (c == '\\') {
408 c = *domainname++;
409 switch ((c)) {
410 case '\\': /* "\\" */
411 continue;
412 case '0': /* "\ooo" */
413 case '1':
414 case '2':
415 case '3':
416 d = *domainname++;
417 if (d < '0' || d > '7')
418 break;
419 e = *domainname++;
420 if (e < '0' || e > '7')
421 break;
422 c = tomoyo_make_byte(c, d, e);
423 if (tomoyo_is_invalid(c))
424 /* pattern is not \000 */
425 continue;
426 }
427 goto out;
428 } else if (tomoyo_is_invalid(c)) {
429 goto out;
430 }
431 }
432 } while (*domainname);
433 return true;
434 out:
435 return false;
436}
437
438/**
439 * tomoyo_is_domain_def - Check whether the given token can be a domainname.
440 *
441 * @buffer: The token to check.
442 *
443 * Returns true if @buffer possibly be a domainname, false otherwise.
444 */
445bool tomoyo_is_domain_def(const unsigned char *buffer)
446{
447 return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN);
448}
449
450/**
451 * tomoyo_find_domain - Find a domain by the given name.
452 *
453 * @domainname: The domainname to find.
454 *
455 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
456 *
457 * Caller holds tomoyo_read_lock().
458 */
459struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
460{
461 struct tomoyo_domain_info *domain;
462 struct tomoyo_path_info name;
463
464 name.name = domainname;
465 tomoyo_fill_path_info(&name);
466 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
467 if (!domain->is_deleted &&
468 !tomoyo_pathcmp(&name, domain->domainname))
469 return domain;
470 }
471 return NULL;
472}
473
474/**
475 * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
476 *
477 * @filename: The string to evaluate.
478 *
479 * Returns the initial length without a pattern in @filename.
480 */
481static int tomoyo_const_part_length(const char *filename)
482{
483 char c;
484 int len = 0;
485
486 if (!filename)
487 return 0;
488 while ((c = *filename++) != '\0') {
489 if (c != '\\') {
490 len++;
491 continue;
492 }
493 c = *filename++;
494 switch (c) {
495 case '\\': /* "\\" */
496 len += 2;
497 continue;
498 case '0': /* "\ooo" */
499 case '1':
500 case '2':
501 case '3':
502 c = *filename++;
503 if (c < '0' || c > '7')
504 break;
505 c = *filename++;
506 if (c < '0' || c > '7')
507 break;
508 len += 4;
509 continue;
510 }
511 break;
512 }
513 return len;
514}
515
516/**
517 * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
518 *
519 * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
520 *
521 * The caller sets "struct tomoyo_path_info"->name.
522 */
523void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
524{
525 const char *name = ptr->name;
526 const int len = strlen(name);
527
528 ptr->const_len = tomoyo_const_part_length(name);
529 ptr->is_dir = len && (name[len - 1] == '/');
530 ptr->is_patterned = (ptr->const_len < len);
531 ptr->hash = full_name_hash(name, len);
532}
533
534/**
535 * tomoyo_file_matches_pattern2 - Pattern matching without '/' character and "\-" pattern.
536 *
537 * @filename: The start of string to check.
538 * @filename_end: The end of string to check.
539 * @pattern: The start of pattern to compare.
540 * @pattern_end: The end of pattern to compare.
541 *
542 * Returns true if @filename matches @pattern, false otherwise.
543 */
544static bool tomoyo_file_matches_pattern2(const char *filename,
545 const char *filename_end,
546 const char *pattern,
547 const char *pattern_end)
548{
549 while (filename < filename_end && pattern < pattern_end) {
550 char c;
551 if (*pattern != '\\') {
552 if (*filename++ != *pattern++)
553 return false;
554 continue;
555 }
556 c = *filename;
557 pattern++;
558 switch (*pattern) {
559 int i;
560 int j;
561 case '?':
562 if (c == '/') {
563 return false;
564 } else if (c == '\\') {
565 if (filename[1] == '\\')
566 filename++;
567 else if (tomoyo_is_byte_range(filename + 1))
568 filename += 3;
569 else
570 return false;
571 }
572 break;
573 case '\\':
574 if (c != '\\')
575 return false;
576 if (*++filename != '\\')
577 return false;
578 break;
579 case '+':
580 if (!isdigit(c))
581 return false;
582 break;
583 case 'x':
584 if (!isxdigit(c))
585 return false;
586 break;
587 case 'a':
588 if (!tomoyo_is_alphabet_char(c))
589 return false;
590 break;
591 case '0':
592 case '1':
593 case '2':
594 case '3':
595 if (c == '\\' && tomoyo_is_byte_range(filename + 1)
596 && strncmp(filename + 1, pattern, 3) == 0) {
597 filename += 3;
598 pattern += 2;
599 break;
600 }
601 return false; /* Not matched. */
602 case '*':
603 case '@':
604 for (i = 0; i <= filename_end - filename; i++) {
605 if (tomoyo_file_matches_pattern2(
606 filename + i, filename_end,
607 pattern + 1, pattern_end))
608 return true;
609 c = filename[i];
610 if (c == '.' && *pattern == '@')
611 break;
612 if (c != '\\')
613 continue;
614 if (filename[i + 1] == '\\')
615 i++;
616 else if (tomoyo_is_byte_range(filename + i + 1))
617 i += 3;
618 else
619 break; /* Bad pattern. */
620 }
621 return false; /* Not matched. */
622 default:
623 j = 0;
624 c = *pattern;
625 if (c == '$') {
626 while (isdigit(filename[j]))
627 j++;
628 } else if (c == 'X') {
629 while (isxdigit(filename[j]))
630 j++;
631 } else if (c == 'A') {
632 while (tomoyo_is_alphabet_char(filename[j]))
633 j++;
634 }
635 for (i = 1; i <= j; i++) {
636 if (tomoyo_file_matches_pattern2(
637 filename + i, filename_end,
638 pattern + 1, pattern_end))
639 return true;
640 }
641 return false; /* Not matched or bad pattern. */
642 }
643 filename++;
644 pattern++;
645 }
646 while (*pattern == '\\' &&
647 (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
648 pattern += 2;
649 return filename == filename_end && pattern == pattern_end;
650}
651
652/**
653 * tomoyo_file_matches_pattern - Pattern matching without '/' character.
654 *
655 * @filename: The start of string to check.
656 * @filename_end: The end of string to check.
657 * @pattern: The start of pattern to compare.
658 * @pattern_end: The end of pattern to compare.
659 *
660 * Returns true if @filename matches @pattern, false otherwise.
661 */
662static bool tomoyo_file_matches_pattern(const char *filename,
663 const char *filename_end,
664 const char *pattern,
665 const char *pattern_end)
666{
667 const char *pattern_start = pattern;
668 bool first = true;
669 bool result;
670
671 while (pattern < pattern_end - 1) {
672 /* Split at "\-" pattern. */
673 if (*pattern++ != '\\' || *pattern++ != '-')
674 continue;
675 result = tomoyo_file_matches_pattern2(filename,
676 filename_end,
677 pattern_start,
678 pattern - 2);
679 if (first)
680 result = !result;
681 if (result)
682 return false;
683 first = false;
684 pattern_start = pattern;
685 }
686 result = tomoyo_file_matches_pattern2(filename, filename_end,
687 pattern_start, pattern_end);
688 return first ? result : !result;
689}
690
691/**
692 * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
693 *
694 * @f: The start of string to check.
695 * @p: The start of pattern to compare.
696 *
697 * Returns true if @f matches @p, false otherwise.
698 */
699static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
700{
701 const char *f_delimiter;
702 const char *p_delimiter;
703
704 while (*f && *p) {
705 f_delimiter = strchr(f, '/');
706 if (!f_delimiter)
707 f_delimiter = f + strlen(f);
708 p_delimiter = strchr(p, '/');
709 if (!p_delimiter)
710 p_delimiter = p + strlen(p);
711 if (*p == '\\' && *(p + 1) == '{')
712 goto recursive;
713 if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
714 p_delimiter))
715 return false;
716 f = f_delimiter;
717 if (*f)
718 f++;
719 p = p_delimiter;
720 if (*p)
721 p++;
722 }
723 /* Ignore trailing "\*" and "\@" in @pattern. */
724 while (*p == '\\' &&
725 (*(p + 1) == '*' || *(p + 1) == '@'))
726 p += 2;
727 return !*f && !*p;
728 recursive:
729 /*
730 * The "\{" pattern is permitted only after '/' character.
731 * This guarantees that below "*(p - 1)" is safe.
732 * Also, the "\}" pattern is permitted only before '/' character
733 * so that "\{" + "\}" pair will not break the "\-" operator.
734 */
735 if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
736 *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
737 return false; /* Bad pattern. */
738 do {
739 /* Compare current component with pattern. */
740 if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
741 p_delimiter - 2))
742 break;
743 /* Proceed to next component. */
744 f = f_delimiter;
745 if (!*f)
746 break;
747 f++;
748 /* Continue comparison. */
749 if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
750 return true;
751 f_delimiter = strchr(f, '/');
752 } while (f_delimiter);
753 return false; /* Not matched. */
754}
755
756/**
757 * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
758 *
759 * @filename: The filename to check.
760 * @pattern: The pattern to compare.
761 *
762 * Returns true if matches, false otherwise.
763 *
764 * The following patterns are available.
765 * \\ \ itself.
766 * \ooo Octal representation of a byte.
767 * \* Zero or more repetitions of characters other than '/'.
768 * \@ Zero or more repetitions of characters other than '/' or '.'.
769 * \? 1 byte character other than '/'.
770 * \$ One or more repetitions of decimal digits.
771 * \+ 1 decimal digit.
772 * \X One or more repetitions of hexadecimal digits.
773 * \x 1 hexadecimal digit.
774 * \A One or more repetitions of alphabet characters.
775 * \a 1 alphabet character.
776 *
777 * \- Subtraction operator.
778 *
779 * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
780 * /dir/dir/dir/ ).
781 */
782bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
783 const struct tomoyo_path_info *pattern)
784{
785 const char *f = filename->name;
786 const char *p = pattern->name;
787 const int len = pattern->const_len;
788
789 /* If @pattern doesn't contain pattern, I can use strcmp(). */
790 if (!pattern->is_patterned)
791 return !tomoyo_pathcmp(filename, pattern);
792 /* Don't compare directory and non-directory. */
793 if (filename->is_dir != pattern->is_dir)
794 return false;
795 /* Compare the initial length without patterns. */
796 if (strncmp(f, p, len))
797 return false;
798 f += len;
799 p += len;
800 return tomoyo_path_matches_pattern2(f, p);
801}
802
803/**
804 * tomoyo_get_exe - Get tomoyo_realpath() of current process.
805 *
806 * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
807 *
808 * This function uses kzalloc(), so the caller must call kfree()
809 * if this function didn't return NULL.
810 */
811const char *tomoyo_get_exe(void)
812{
813 struct mm_struct *mm = current->mm;
814 struct vm_area_struct *vma;
815 const char *cp = NULL;
816
817 if (!mm)
818 return NULL;
819 down_read(&mm->mmap_sem);
820 for (vma = mm->mmap; vma; vma = vma->vm_next) {
821 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
822 cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
823 break;
824 }
825 }
826 up_read(&mm->mmap_sem);
827 return cp;
828}
829
830/**
831 * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members.
832 *
833 * @r: Pointer to "struct tomoyo_request_info" to initialize.
834 * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain().
835 *
836 * Returns mode.
837 */
838int tomoyo_init_request_info(struct tomoyo_request_info *r,
839 struct tomoyo_domain_info *domain)
840{
841 memset(r, 0, sizeof(*r));
842 if (!domain)
843 domain = tomoyo_domain();
844 r->domain = domain;
845 r->mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
846 return r->mode;
847}
848
849/**
850 * tomoyo_warn_log - Print warning or error message on console.
851 *
852 * @r: Pointer to "struct tomoyo_request_info".
853 * @fmt: The printf()'s format string, followed by parameters.
854 */
855void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...)
856{
857 int len = PAGE_SIZE;
858 va_list args;
859 char *buffer;
860 if (!tomoyo_verbose_mode(r->domain))
861 return;
862 while (1) {
863 int len2;
864 buffer = kmalloc(len, GFP_NOFS);
865 if (!buffer)
866 return;
867 va_start(args, fmt);
868 len2 = vsnprintf(buffer, len - 1, fmt, args);
869 va_end(args);
870 if (len2 <= len - 1) {
871 buffer[len2] = '\0';
872 break;
873 }
874 len = len2 + 1;
875 kfree(buffer);
876 }
877 printk(KERN_WARNING "TOMOYO-%s: Access %s denied for %s\n",
878 r->mode == TOMOYO_CONFIG_ENFORCING ? "ERROR" : "WARNING",
879 buffer, tomoyo_get_last_name(r->domain));
880 kfree(buffer);
881}
882
883/**
884 * tomoyo_domain_quota_is_ok - Check for domain's quota.
885 *
886 * @r: Pointer to "struct tomoyo_request_info".
887 *
888 * Returns true if the domain is not exceeded quota, false otherwise.
889 *
890 * Caller holds tomoyo_read_lock().
891 */
892bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
893{
894 unsigned int count = 0;
895 struct tomoyo_domain_info *domain = r->domain;
896 struct tomoyo_acl_info *ptr;
897
898 if (r->mode != TOMOYO_CONFIG_LEARNING)
899 return false;
900 if (!domain)
901 return true;
902 list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
903 switch (ptr->type) {
904 u16 perm;
905 u8 i;
906 case TOMOYO_TYPE_PATH_ACL:
907 perm = container_of(ptr, struct tomoyo_path_acl, head)
908 ->perm;
909 for (i = 0; i < TOMOYO_MAX_PATH_OPERATION; i++)
910 if (perm & (1 << i))
911 count++;
912 if (perm & (1 << TOMOYO_TYPE_READ_WRITE))
913 count -= 2;
914 break;
915 case TOMOYO_TYPE_PATH2_ACL:
916 perm = container_of(ptr, struct tomoyo_path2_acl, head)
917 ->perm;
918 for (i = 0; i < TOMOYO_MAX_PATH2_OPERATION; i++)
919 if (perm & (1 << i))
920 count++;
921 break;
922 case TOMOYO_TYPE_PATH_NUMBER_ACL:
923 perm = container_of(ptr, struct tomoyo_path_number_acl,
924 head)->perm;
925 for (i = 0; i < TOMOYO_MAX_PATH_NUMBER_OPERATION; i++)
926 if (perm & (1 << i))
927 count++;
928 break;
929 case TOMOYO_TYPE_PATH_NUMBER3_ACL:
930 perm = container_of(ptr, struct tomoyo_path_number3_acl,
931 head)->perm;
932 for (i = 0; i < TOMOYO_MAX_PATH_NUMBER3_OPERATION; i++)
933 if (perm & (1 << i))
934 count++;
935 break;
936 case TOMOYO_TYPE_MOUNT_ACL:
937 if (!container_of(ptr, struct tomoyo_mount_acl, head)->
938 is_deleted)
939 count++;
940 }
941 }
942 if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
943 return true;
944 if (!domain->quota_warned) {
945 domain->quota_warned = true;
946 printk(KERN_WARNING "TOMOYO-WARNING: "
947 "Domain '%s' has so many ACLs to hold. "
948 "Stopped learning mode.\n", domain->domainname->name);
949 }
950 return false;
951}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 15:31:00 -0500