TOMOYO: Use shorter names.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / security / tomoyo / common.c
blobffcf0245056042a1ac7ecbb8ffcce3fe6f2d62b4
1 /*
2 * security/tomoyo/common.c
4 * Common functions for TOMOYO.
6 * Copyright (C) 2005-2009 NTT DATA CORPORATION
8 * Version: 2.2.0 2009/04/01
12 #include <linux/uaccess.h>
13 #include <linux/security.h>
14 #include <linux/hardirq.h>
15 #include "common.h"
17 /* Lock for protecting policy. */
18 DEFINE_MUTEX(tomoyo_policy_lock);
20 /* Has loading policy done? */
21 bool tomoyo_policy_loaded;
23 /* String table for functionality that takes 4 modes. */
24 static const char *tomoyo_mode_4[4] = {
25 "disabled", "learning", "permissive", "enforcing"
27 /* String table for functionality that takes 2 modes. */
28 static const char *tomoyo_mode_2[4] = {
29 "disabled", "enabled", "enabled", "enabled"
33 * tomoyo_control_array is a static data which contains
35 * (1) functionality name used by /sys/kernel/security/tomoyo/profile .
36 * (2) initial values for "struct tomoyo_profile".
37 * (3) max values for "struct tomoyo_profile".
39 static struct {
40 const char *keyword;
41 unsigned int current_value;
42 const unsigned int max_value;
43 } tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = {
44 [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 },
45 [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX },
46 [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 },
50 * tomoyo_profile is a structure which is used for holding the mode of access
51 * controls. TOMOYO has 4 modes: disabled, learning, permissive, enforcing.
52 * An administrator can define up to 256 profiles.
53 * The ->profile of "struct tomoyo_domain_info" is used for remembering
54 * the profile's number (0 - 255) assigned to that domain.
56 static struct tomoyo_profile {
57 unsigned int value[TOMOYO_MAX_CONTROL_INDEX];
58 const struct tomoyo_path_info *comment;
59 } *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
61 /* Permit policy management by non-root user? */
62 static bool tomoyo_manage_by_non_root;
64 /* Utility functions. */
66 /* Open operation for /sys/kernel/security/tomoyo/ interface. */
67 static int tomoyo_open_control(const u8 type, struct file *file);
68 /* Close /sys/kernel/security/tomoyo/ interface. */
69 static int tomoyo_close_control(struct file *file);
70 /* Read operation for /sys/kernel/security/tomoyo/ interface. */
71 static int tomoyo_read_control(struct file *file, char __user *buffer,
72 const int buffer_len);
73 /* Write operation for /sys/kernel/security/tomoyo/ interface. */
74 static int tomoyo_write_control(struct file *file, const char __user *buffer,
75 const int buffer_len);
77 /**
78 * tomoyo_is_byte_range - Check whether the string isa \ooo style octal value.
80 * @str: Pointer to the string.
82 * Returns true if @str is a \ooo style octal value, false otherwise.
84 * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
85 * This function verifies that \ooo is in valid range.
87 static inline bool tomoyo_is_byte_range(const char *str)
89 return *str >= '0' && *str++ <= '3' &&
90 *str >= '0' && *str++ <= '7' &&
91 *str >= '0' && *str <= '7';
94 /**
95 * tomoyo_is_alphabet_char - Check whether the character is an alphabet.
97 * @c: The character to check.
99 * Returns true if @c is an alphabet character, false otherwise.
101 static inline bool tomoyo_is_alphabet_char(const char c)
103 return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
107 * tomoyo_make_byte - Make byte value from three octal characters.
109 * @c1: The first character.
110 * @c2: The second character.
111 * @c3: The third character.
113 * Returns byte value.
115 static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
117 return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
121 * tomoyo_str_starts - Check whether the given string starts with the given keyword.
123 * @src: Pointer to pointer to the string.
124 * @find: Pointer to the keyword.
126 * Returns true if @src starts with @find, false otherwise.
128 * The @src is updated to point the first character after the @find
129 * if @src starts with @find.
131 static bool tomoyo_str_starts(char **src, const char *find)
133 const int len = strlen(find);
134 char *tmp = *src;
136 if (strncmp(tmp, find, len))
137 return false;
138 tmp += len;
139 *src = tmp;
140 return true;
144 * tomoyo_normalize_line - Format string.
146 * @buffer: The line to normalize.
148 * Leading and trailing whitespaces are removed.
149 * Multiple whitespaces are packed into single space.
151 * Returns nothing.
153 static void tomoyo_normalize_line(unsigned char *buffer)
155 unsigned char *sp = buffer;
156 unsigned char *dp = buffer;
157 bool first = true;
159 while (tomoyo_is_invalid(*sp))
160 sp++;
161 while (*sp) {
162 if (!first)
163 *dp++ = ' ';
164 first = false;
165 while (tomoyo_is_valid(*sp))
166 *dp++ = *sp++;
167 while (tomoyo_is_invalid(*sp))
168 sp++;
170 *dp = '\0';
174 * tomoyo_is_correct_path - Validate a pathname.
175 * @filename: The pathname to check.
176 * @start_type: Should the pathname start with '/'?
177 * 1 = must / -1 = must not / 0 = don't care
178 * @pattern_type: Can the pathname contain a wildcard?
179 * 1 = must / -1 = must not / 0 = don't care
180 * @end_type: Should the pathname end with '/'?
181 * 1 = must / -1 = must not / 0 = don't care
182 * @function: The name of function calling me.
184 * Check whether the given filename follows the naming rules.
185 * Returns true if @filename follows the naming rules, false otherwise.
187 bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
188 const s8 pattern_type, const s8 end_type,
189 const char *function)
191 const char *const start = filename;
192 bool in_repetition = false;
193 bool contains_pattern = false;
194 unsigned char c;
195 unsigned char d;
196 unsigned char e;
197 const char *original_filename = filename;
199 if (!filename)
200 goto out;
201 c = *filename;
202 if (start_type == 1) { /* Must start with '/' */
203 if (c != '/')
204 goto out;
205 } else if (start_type == -1) { /* Must not start with '/' */
206 if (c == '/')
207 goto out;
209 if (c)
210 c = *(filename + strlen(filename) - 1);
211 if (end_type == 1) { /* Must end with '/' */
212 if (c != '/')
213 goto out;
214 } else if (end_type == -1) { /* Must not end with '/' */
215 if (c == '/')
216 goto out;
218 while (1) {
219 c = *filename++;
220 if (!c)
221 break;
222 if (c == '\\') {
223 c = *filename++;
224 switch (c) {
225 case '\\': /* "\\" */
226 continue;
227 case '$': /* "\$" */
228 case '+': /* "\+" */
229 case '?': /* "\?" */
230 case '*': /* "\*" */
231 case '@': /* "\@" */
232 case 'x': /* "\x" */
233 case 'X': /* "\X" */
234 case 'a': /* "\a" */
235 case 'A': /* "\A" */
236 case '-': /* "\-" */
237 if (pattern_type == -1)
238 break; /* Must not contain pattern */
239 contains_pattern = true;
240 continue;
241 case '{': /* "/\{" */
242 if (filename - 3 < start ||
243 *(filename - 3) != '/')
244 break;
245 if (pattern_type == -1)
246 break; /* Must not contain pattern */
247 contains_pattern = true;
248 in_repetition = true;
249 continue;
250 case '}': /* "\}/" */
251 if (*filename != '/')
252 break;
253 if (!in_repetition)
254 break;
255 in_repetition = false;
256 continue;
257 case '0': /* "\ooo" */
258 case '1':
259 case '2':
260 case '3':
261 d = *filename++;
262 if (d < '0' || d > '7')
263 break;
264 e = *filename++;
265 if (e < '0' || e > '7')
266 break;
267 c = tomoyo_make_byte(c, d, e);
268 if (tomoyo_is_invalid(c))
269 continue; /* pattern is not \000 */
271 goto out;
272 } else if (in_repetition && c == '/') {
273 goto out;
274 } else if (tomoyo_is_invalid(c)) {
275 goto out;
278 if (pattern_type == 1) { /* Must contain pattern */
279 if (!contains_pattern)
280 goto out;
282 if (in_repetition)
283 goto out;
284 return true;
285 out:
286 printk(KERN_DEBUG "%s: Invalid pathname '%s'\n", function,
287 original_filename);
288 return false;
292 * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules.
293 * @domainname: The domainname to check.
294 * @function: The name of function calling me.
296 * Returns true if @domainname follows the naming rules, false otherwise.
298 bool tomoyo_is_correct_domain(const unsigned char *domainname,
299 const char *function)
301 unsigned char c;
302 unsigned char d;
303 unsigned char e;
304 const char *org_domainname = domainname;
306 if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
307 TOMOYO_ROOT_NAME_LEN))
308 goto out;
309 domainname += TOMOYO_ROOT_NAME_LEN;
310 if (!*domainname)
311 return true;
312 do {
313 if (*domainname++ != ' ')
314 goto out;
315 if (*domainname++ != '/')
316 goto out;
317 while ((c = *domainname) != '\0' && c != ' ') {
318 domainname++;
319 if (c == '\\') {
320 c = *domainname++;
321 switch ((c)) {
322 case '\\': /* "\\" */
323 continue;
324 case '0': /* "\ooo" */
325 case '1':
326 case '2':
327 case '3':
328 d = *domainname++;
329 if (d < '0' || d > '7')
330 break;
331 e = *domainname++;
332 if (e < '0' || e > '7')
333 break;
334 c = tomoyo_make_byte(c, d, e);
335 if (tomoyo_is_invalid(c))
336 /* pattern is not \000 */
337 continue;
339 goto out;
340 } else if (tomoyo_is_invalid(c)) {
341 goto out;
344 } while (*domainname);
345 return true;
346 out:
347 printk(KERN_DEBUG "%s: Invalid domainname '%s'\n", function,
348 org_domainname);
349 return false;
353 * tomoyo_is_domain_def - Check whether the given token can be a domainname.
355 * @buffer: The token to check.
357 * Returns true if @buffer possibly be a domainname, false otherwise.
359 bool tomoyo_is_domain_def(const unsigned char *buffer)
361 return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN);
365 * tomoyo_find_domain - Find a domain by the given name.
367 * @domainname: The domainname to find.
369 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
371 * Caller holds tomoyo_read_lock().
373 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
375 struct tomoyo_domain_info *domain;
376 struct tomoyo_path_info name;
378 name.name = domainname;
379 tomoyo_fill_path_info(&name);
380 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
381 if (!domain->is_deleted &&
382 !tomoyo_pathcmp(&name, domain->domainname))
383 return domain;
385 return NULL;
389 * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
391 * @filename: The string to evaluate.
393 * Returns the initial length without a pattern in @filename.
395 static int tomoyo_const_part_length(const char *filename)
397 char c;
398 int len = 0;
400 if (!filename)
401 return 0;
402 while ((c = *filename++) != '\0') {
403 if (c != '\\') {
404 len++;
405 continue;
407 c = *filename++;
408 switch (c) {
409 case '\\': /* "\\" */
410 len += 2;
411 continue;
412 case '0': /* "\ooo" */
413 case '1':
414 case '2':
415 case '3':
416 c = *filename++;
417 if (c < '0' || c > '7')
418 break;
419 c = *filename++;
420 if (c < '0' || c > '7')
421 break;
422 len += 4;
423 continue;
425 break;
427 return len;
431 * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
433 * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
435 * The caller sets "struct tomoyo_path_info"->name.
437 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
439 const char *name = ptr->name;
440 const int len = strlen(name);
442 ptr->const_len = tomoyo_const_part_length(name);
443 ptr->is_dir = len && (name[len - 1] == '/');
444 ptr->is_patterned = (ptr->const_len < len);
445 ptr->hash = full_name_hash(name, len);
449 * tomoyo_file_matches_pattern2 - Pattern matching without '/' character
450 * and "\-" pattern.
452 * @filename: The start of string to check.
453 * @filename_end: The end of string to check.
454 * @pattern: The start of pattern to compare.
455 * @pattern_end: The end of pattern to compare.
457 * Returns true if @filename matches @pattern, false otherwise.
459 static bool tomoyo_file_matches_pattern2(const char *filename,
460 const char *filename_end,
461 const char *pattern,
462 const char *pattern_end)
464 while (filename < filename_end && pattern < pattern_end) {
465 char c;
466 if (*pattern != '\\') {
467 if (*filename++ != *pattern++)
468 return false;
469 continue;
471 c = *filename;
472 pattern++;
473 switch (*pattern) {
474 int i;
475 int j;
476 case '?':
477 if (c == '/') {
478 return false;
479 } else if (c == '\\') {
480 if (filename[1] == '\\')
481 filename++;
482 else if (tomoyo_is_byte_range(filename + 1))
483 filename += 3;
484 else
485 return false;
487 break;
488 case '\\':
489 if (c != '\\')
490 return false;
491 if (*++filename != '\\')
492 return false;
493 break;
494 case '+':
495 if (!isdigit(c))
496 return false;
497 break;
498 case 'x':
499 if (!isxdigit(c))
500 return false;
501 break;
502 case 'a':
503 if (!tomoyo_is_alphabet_char(c))
504 return false;
505 break;
506 case '0':
507 case '1':
508 case '2':
509 case '3':
510 if (c == '\\' && tomoyo_is_byte_range(filename + 1)
511 && strncmp(filename + 1, pattern, 3) == 0) {
512 filename += 3;
513 pattern += 2;
514 break;
516 return false; /* Not matched. */
517 case '*':
518 case '@':
519 for (i = 0; i <= filename_end - filename; i++) {
520 if (tomoyo_file_matches_pattern2(
521 filename + i, filename_end,
522 pattern + 1, pattern_end))
523 return true;
524 c = filename[i];
525 if (c == '.' && *pattern == '@')
526 break;
527 if (c != '\\')
528 continue;
529 if (filename[i + 1] == '\\')
530 i++;
531 else if (tomoyo_is_byte_range(filename + i + 1))
532 i += 3;
533 else
534 break; /* Bad pattern. */
536 return false; /* Not matched. */
537 default:
538 j = 0;
539 c = *pattern;
540 if (c == '$') {
541 while (isdigit(filename[j]))
542 j++;
543 } else if (c == 'X') {
544 while (isxdigit(filename[j]))
545 j++;
546 } else if (c == 'A') {
547 while (tomoyo_is_alphabet_char(filename[j]))
548 j++;
550 for (i = 1; i <= j; i++) {
551 if (tomoyo_file_matches_pattern2(
552 filename + i, filename_end,
553 pattern + 1, pattern_end))
554 return true;
556 return false; /* Not matched or bad pattern. */
558 filename++;
559 pattern++;
561 while (*pattern == '\\' &&
562 (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
563 pattern += 2;
564 return filename == filename_end && pattern == pattern_end;
568 * tomoyo_file_matches_pattern - Pattern matching without without '/' character.
570 * @filename: The start of string to check.
571 * @filename_end: The end of string to check.
572 * @pattern: The start of pattern to compare.
573 * @pattern_end: The end of pattern to compare.
575 * Returns true if @filename matches @pattern, false otherwise.
577 static bool tomoyo_file_matches_pattern(const char *filename,
578 const char *filename_end,
579 const char *pattern,
580 const char *pattern_end)
582 const char *pattern_start = pattern;
583 bool first = true;
584 bool result;
586 while (pattern < pattern_end - 1) {
587 /* Split at "\-" pattern. */
588 if (*pattern++ != '\\' || *pattern++ != '-')
589 continue;
590 result = tomoyo_file_matches_pattern2(filename,
591 filename_end,
592 pattern_start,
593 pattern - 2);
594 if (first)
595 result = !result;
596 if (result)
597 return false;
598 first = false;
599 pattern_start = pattern;
601 result = tomoyo_file_matches_pattern2(filename, filename_end,
602 pattern_start, pattern_end);
603 return first ? result : !result;
607 * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
609 * @f: The start of string to check.
610 * @p: The start of pattern to compare.
612 * Returns true if @f matches @p, false otherwise.
614 static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
616 const char *f_delimiter;
617 const char *p_delimiter;
619 while (*f && *p) {
620 f_delimiter = strchr(f, '/');
621 if (!f_delimiter)
622 f_delimiter = f + strlen(f);
623 p_delimiter = strchr(p, '/');
624 if (!p_delimiter)
625 p_delimiter = p + strlen(p);
626 if (*p == '\\' && *(p + 1) == '{')
627 goto recursive;
628 if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
629 p_delimiter))
630 return false;
631 f = f_delimiter;
632 if (*f)
633 f++;
634 p = p_delimiter;
635 if (*p)
636 p++;
638 /* Ignore trailing "\*" and "\@" in @pattern. */
639 while (*p == '\\' &&
640 (*(p + 1) == '*' || *(p + 1) == '@'))
641 p += 2;
642 return !*f && !*p;
643 recursive:
645 * The "\{" pattern is permitted only after '/' character.
646 * This guarantees that below "*(p - 1)" is safe.
647 * Also, the "\}" pattern is permitted only before '/' character
648 * so that "\{" + "\}" pair will not break the "\-" operator.
650 if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
651 *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
652 return false; /* Bad pattern. */
653 do {
654 /* Compare current component with pattern. */
655 if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
656 p_delimiter - 2))
657 break;
658 /* Proceed to next component. */
659 f = f_delimiter;
660 if (!*f)
661 break;
662 f++;
663 /* Continue comparison. */
664 if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
665 return true;
666 f_delimiter = strchr(f, '/');
667 } while (f_delimiter);
668 return false; /* Not matched. */
672 * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
674 * @filename: The filename to check.
675 * @pattern: The pattern to compare.
677 * Returns true if matches, false otherwise.
679 * The following patterns are available.
680 * \\ \ itself.
681 * \ooo Octal representation of a byte.
682 * \* Zero or more repetitions of characters other than '/'.
683 * \@ Zero or more repetitions of characters other than '/' or '.'.
684 * \? 1 byte character other than '/'.
685 * \$ One or more repetitions of decimal digits.
686 * \+ 1 decimal digit.
687 * \X One or more repetitions of hexadecimal digits.
688 * \x 1 hexadecimal digit.
689 * \A One or more repetitions of alphabet characters.
690 * \a 1 alphabet character.
692 * \- Subtraction operator.
694 * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
695 * /dir/dir/dir/ ).
697 bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
698 const struct tomoyo_path_info *pattern)
700 const char *f = filename->name;
701 const char *p = pattern->name;
702 const int len = pattern->const_len;
704 /* If @pattern doesn't contain pattern, I can use strcmp(). */
705 if (!pattern->is_patterned)
706 return !tomoyo_pathcmp(filename, pattern);
707 /* Don't compare directory and non-directory. */
708 if (filename->is_dir != pattern->is_dir)
709 return false;
710 /* Compare the initial length without patterns. */
711 if (strncmp(f, p, len))
712 return false;
713 f += len;
714 p += len;
715 return tomoyo_path_matches_pattern2(f, p);
719 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
721 * @head: Pointer to "struct tomoyo_io_buffer".
722 * @fmt: The printf()'s format string, followed by parameters.
724 * Returns true if output was written, false otherwise.
726 * The snprintf() will truncate, but tomoyo_io_printf() won't.
728 bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
730 va_list args;
731 int len;
732 int pos = head->read_avail;
733 int size = head->readbuf_size - pos;
735 if (size <= 0)
736 return false;
737 va_start(args, fmt);
738 len = vsnprintf(head->read_buf + pos, size, fmt, args);
739 va_end(args);
740 if (pos + len >= head->readbuf_size)
741 return false;
742 head->read_avail += len;
743 return true;
747 * tomoyo_get_exe - Get tomoyo_realpath() of current process.
749 * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
751 * This function uses kzalloc(), so the caller must call kfree()
752 * if this function didn't return NULL.
754 static const char *tomoyo_get_exe(void)
756 struct mm_struct *mm = current->mm;
757 struct vm_area_struct *vma;
758 const char *cp = NULL;
760 if (!mm)
761 return NULL;
762 down_read(&mm->mmap_sem);
763 for (vma = mm->mmap; vma; vma = vma->vm_next) {
764 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
765 cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
766 break;
769 up_read(&mm->mmap_sem);
770 return cp;
774 * tomoyo_get_msg - Get warning message.
776 * @is_enforce: Is it enforcing mode?
778 * Returns "ERROR" or "WARNING".
780 const char *tomoyo_get_msg(const bool is_enforce)
782 if (is_enforce)
783 return "ERROR";
784 else
785 return "WARNING";
789 * tomoyo_check_flags - Check mode for specified functionality.
791 * @domain: Pointer to "struct tomoyo_domain_info".
792 * @index: The functionality to check mode.
794 * TOMOYO checks only process context.
795 * This code disables TOMOYO's enforcement in case the function is called from
796 * interrupt context.
798 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
799 const u8 index)
801 const u8 profile = domain->profile;
803 if (WARN_ON(in_interrupt()))
804 return 0;
805 return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX
806 #if TOMOYO_MAX_PROFILES != 256
807 && profile < TOMOYO_MAX_PROFILES
808 #endif
809 && tomoyo_profile_ptr[profile] ?
810 tomoyo_profile_ptr[profile]->value[index] : 0;
814 * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode.
816 * @domain: Pointer to "struct tomoyo_domain_info".
818 * Returns true if domain policy violation warning should be printed to
819 * console.
821 bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain)
823 return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0;
827 * tomoyo_domain_quota_is_ok - Check for domain's quota.
829 * @domain: Pointer to "struct tomoyo_domain_info".
831 * Returns true if the domain is not exceeded quota, false otherwise.
833 * Caller holds tomoyo_read_lock().
835 bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain)
837 unsigned int count = 0;
838 struct tomoyo_acl_info *ptr;
840 if (!domain)
841 return true;
842 list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
843 switch (ptr->type) {
844 struct tomoyo_path_acl *acl;
845 u32 perm;
846 u8 i;
847 case TOMOYO_TYPE_PATH_ACL:
848 acl = container_of(ptr, struct tomoyo_path_acl, head);
849 perm = acl->perm | (((u32) acl->perm_high) << 16);
850 for (i = 0; i < TOMOYO_MAX_PATH_OPERATION; i++)
851 if (perm & (1 << i))
852 count++;
853 if (perm & (1 << TOMOYO_TYPE_READ_WRITE))
854 count -= 2;
855 break;
856 case TOMOYO_TYPE_PATH2_ACL:
857 perm = container_of(ptr, struct tomoyo_path2_acl, head)
858 ->perm;
859 for (i = 0; i < TOMOYO_MAX_PATH2_OPERATION; i++)
860 if (perm & (1 << i))
861 count++;
862 break;
865 if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
866 return true;
867 if (!domain->quota_warned) {
868 domain->quota_warned = true;
869 printk(KERN_WARNING "TOMOYO-WARNING: "
870 "Domain '%s' has so many ACLs to hold. "
871 "Stopped learning mode.\n", domain->domainname->name);
873 return false;
877 * tomoyo_find_or_assign_new_profile - Create a new profile.
879 * @profile: Profile number to create.
881 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
883 static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned
884 int profile)
886 static DEFINE_MUTEX(lock);
887 struct tomoyo_profile *ptr = NULL;
888 int i;
890 if (profile >= TOMOYO_MAX_PROFILES)
891 return NULL;
892 mutex_lock(&lock);
893 ptr = tomoyo_profile_ptr[profile];
894 if (ptr)
895 goto ok;
896 ptr = kmalloc(sizeof(*ptr), GFP_KERNEL);
897 if (!tomoyo_memory_ok(ptr)) {
898 kfree(ptr);
899 goto ok;
901 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++)
902 ptr->value[i] = tomoyo_control_array[i].current_value;
903 mb(); /* Avoid out-of-order execution. */
904 tomoyo_profile_ptr[profile] = ptr;
906 mutex_unlock(&lock);
907 return ptr;
911 * tomoyo_write_profile - Write to profile table.
913 * @head: Pointer to "struct tomoyo_io_buffer".
915 * Returns 0 on success, negative value otherwise.
917 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
919 char *data = head->write_buf;
920 unsigned int i;
921 unsigned int value;
922 char *cp;
923 struct tomoyo_profile *profile;
924 unsigned long num;
926 cp = strchr(data, '-');
927 if (cp)
928 *cp = '\0';
929 if (strict_strtoul(data, 10, &num))
930 return -EINVAL;
931 if (cp)
932 data = cp + 1;
933 profile = tomoyo_find_or_assign_new_profile(num);
934 if (!profile)
935 return -EINVAL;
936 cp = strchr(data, '=');
937 if (!cp)
938 return -EINVAL;
939 *cp = '\0';
940 if (!strcmp(data, "COMMENT")) {
941 const struct tomoyo_path_info *old_comment = profile->comment;
942 profile->comment = tomoyo_get_name(cp + 1);
943 tomoyo_put_name(old_comment);
944 return 0;
946 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) {
947 if (strcmp(data, tomoyo_control_array[i].keyword))
948 continue;
949 if (sscanf(cp + 1, "%u", &value) != 1) {
950 int j;
951 const char **modes;
952 switch (i) {
953 case TOMOYO_VERBOSE:
954 modes = tomoyo_mode_2;
955 break;
956 default:
957 modes = tomoyo_mode_4;
958 break;
960 for (j = 0; j < 4; j++) {
961 if (strcmp(cp + 1, modes[j]))
962 continue;
963 value = j;
964 break;
966 if (j == 4)
967 return -EINVAL;
968 } else if (value > tomoyo_control_array[i].max_value) {
969 value = tomoyo_control_array[i].max_value;
971 profile->value[i] = value;
972 return 0;
974 return -EINVAL;
978 * tomoyo_read_profile - Read from profile table.
980 * @head: Pointer to "struct tomoyo_io_buffer".
982 * Returns 0.
984 static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
986 static const int total = TOMOYO_MAX_CONTROL_INDEX + 1;
987 int step;
989 if (head->read_eof)
990 return 0;
991 for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total;
992 step++) {
993 const u8 index = step / total;
994 u8 type = step % total;
995 const struct tomoyo_profile *profile
996 = tomoyo_profile_ptr[index];
997 head->read_step = step;
998 if (!profile)
999 continue;
1000 if (!type) { /* Print profile' comment tag. */
1001 if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n",
1002 index, profile->comment ?
1003 profile->comment->name : ""))
1004 break;
1005 continue;
1007 type--;
1008 if (type < TOMOYO_MAX_CONTROL_INDEX) {
1009 const unsigned int value = profile->value[type];
1010 const char **modes = NULL;
1011 const char *keyword
1012 = tomoyo_control_array[type].keyword;
1013 switch (tomoyo_control_array[type].max_value) {
1014 case 3:
1015 modes = tomoyo_mode_4;
1016 break;
1017 case 1:
1018 modes = tomoyo_mode_2;
1019 break;
1021 if (modes) {
1022 if (!tomoyo_io_printf(head, "%u-%s=%s\n", index,
1023 keyword, modes[value]))
1024 break;
1025 } else {
1026 if (!tomoyo_io_printf(head, "%u-%s=%u\n", index,
1027 keyword, value))
1028 break;
1032 if (step == TOMOYO_MAX_PROFILES * total)
1033 head->read_eof = true;
1034 return 0;
1038 * tomoyo_policy_manager_list is used for holding list of domainnames or
1039 * programs which are permitted to modify configuration via
1040 * /sys/kernel/security/tomoyo/ interface.
1042 * An entry is added by
1044 * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
1045 * /sys/kernel/security/tomoyo/manager
1046 * (if you want to specify by a domainname)
1048 * or
1050 * # echo '/usr/lib/ccs/editpolicy' > /sys/kernel/security/tomoyo/manager
1051 * (if you want to specify by a program's location)
1053 * and is deleted by
1055 * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
1056 * /sys/kernel/security/tomoyo/manager
1058 * or
1060 * # echo 'delete /usr/lib/ccs/editpolicy' > \
1061 * /sys/kernel/security/tomoyo/manager
1063 * and all entries are retrieved by
1065 * # cat /sys/kernel/security/tomoyo/manager
1067 LIST_HEAD(tomoyo_policy_manager_list);
1070 * tomoyo_update_manager_entry - Add a manager entry.
1072 * @manager: The path to manager or the domainnamme.
1073 * @is_delete: True if it is a delete request.
1075 * Returns 0 on success, negative value otherwise.
1077 * Caller holds tomoyo_read_lock().
1079 static int tomoyo_update_manager_entry(const char *manager,
1080 const bool is_delete)
1082 struct tomoyo_policy_manager_entry *entry = NULL;
1083 struct tomoyo_policy_manager_entry *ptr;
1084 const struct tomoyo_path_info *saved_manager;
1085 int error = is_delete ? -ENOENT : -ENOMEM;
1086 bool is_domain = false;
1088 if (tomoyo_is_domain_def(manager)) {
1089 if (!tomoyo_is_correct_domain(manager, __func__))
1090 return -EINVAL;
1091 is_domain = true;
1092 } else {
1093 if (!tomoyo_is_correct_path(manager, 1, -1, -1, __func__))
1094 return -EINVAL;
1096 saved_manager = tomoyo_get_name(manager);
1097 if (!saved_manager)
1098 return -ENOMEM;
1099 if (!is_delete)
1100 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
1101 mutex_lock(&tomoyo_policy_lock);
1102 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
1103 if (ptr->manager != saved_manager)
1104 continue;
1105 ptr->is_deleted = is_delete;
1106 error = 0;
1107 break;
1109 if (!is_delete && error && tomoyo_memory_ok(entry)) {
1110 entry->manager = saved_manager;
1111 saved_manager = NULL;
1112 entry->is_domain = is_domain;
1113 list_add_tail_rcu(&entry->list, &tomoyo_policy_manager_list);
1114 entry = NULL;
1115 error = 0;
1117 mutex_unlock(&tomoyo_policy_lock);
1118 tomoyo_put_name(saved_manager);
1119 kfree(entry);
1120 return error;
1124 * tomoyo_write_manager_policy - Write manager policy.
1126 * @head: Pointer to "struct tomoyo_io_buffer".
1128 * Returns 0 on success, negative value otherwise.
1130 * Caller holds tomoyo_read_lock().
1132 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
1134 char *data = head->write_buf;
1135 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1137 if (!strcmp(data, "manage_by_non_root")) {
1138 tomoyo_manage_by_non_root = !is_delete;
1139 return 0;
1141 return tomoyo_update_manager_entry(data, is_delete);
1145 * tomoyo_read_manager_policy - Read manager policy.
1147 * @head: Pointer to "struct tomoyo_io_buffer".
1149 * Returns 0.
1151 * Caller holds tomoyo_read_lock().
1153 static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
1155 struct list_head *pos;
1156 bool done = true;
1158 if (head->read_eof)
1159 return 0;
1160 list_for_each_cookie(pos, head->read_var2,
1161 &tomoyo_policy_manager_list) {
1162 struct tomoyo_policy_manager_entry *ptr;
1163 ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
1164 list);
1165 if (ptr->is_deleted)
1166 continue;
1167 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
1168 if (!done)
1169 break;
1171 head->read_eof = done;
1172 return 0;
1176 * tomoyo_is_policy_manager - Check whether the current process is a policy manager.
1178 * Returns true if the current process is permitted to modify policy
1179 * via /sys/kernel/security/tomoyo/ interface.
1181 * Caller holds tomoyo_read_lock().
1183 static bool tomoyo_is_policy_manager(void)
1185 struct tomoyo_policy_manager_entry *ptr;
1186 const char *exe;
1187 const struct task_struct *task = current;
1188 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
1189 bool found = false;
1191 if (!tomoyo_policy_loaded)
1192 return true;
1193 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
1194 return false;
1195 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
1196 if (!ptr->is_deleted && ptr->is_domain
1197 && !tomoyo_pathcmp(domainname, ptr->manager)) {
1198 found = true;
1199 break;
1202 if (found)
1203 return true;
1204 exe = tomoyo_get_exe();
1205 if (!exe)
1206 return false;
1207 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
1208 if (!ptr->is_deleted && !ptr->is_domain
1209 && !strcmp(exe, ptr->manager->name)) {
1210 found = true;
1211 break;
1214 if (!found) { /* Reduce error messages. */
1215 static pid_t last_pid;
1216 const pid_t pid = current->pid;
1217 if (last_pid != pid) {
1218 printk(KERN_WARNING "%s ( %s ) is not permitted to "
1219 "update policies.\n", domainname->name, exe);
1220 last_pid = pid;
1223 kfree(exe);
1224 return found;
1228 * tomoyo_is_select_one - Parse select command.
1230 * @head: Pointer to "struct tomoyo_io_buffer".
1231 * @data: String to parse.
1233 * Returns true on success, false otherwise.
1235 * Caller holds tomoyo_read_lock().
1237 static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
1238 const char *data)
1240 unsigned int pid;
1241 struct tomoyo_domain_info *domain = NULL;
1243 if (sscanf(data, "pid=%u", &pid) == 1) {
1244 struct task_struct *p;
1245 read_lock(&tasklist_lock);
1246 p = find_task_by_vpid(pid);
1247 if (p)
1248 domain = tomoyo_real_domain(p);
1249 read_unlock(&tasklist_lock);
1250 } else if (!strncmp(data, "domain=", 7)) {
1251 if (tomoyo_is_domain_def(data + 7))
1252 domain = tomoyo_find_domain(data + 7);
1253 } else
1254 return false;
1255 head->write_var1 = domain;
1256 /* Accessing read_buf is safe because head->io_sem is held. */
1257 if (!head->read_buf)
1258 return true; /* Do nothing if open(O_WRONLY). */
1259 head->read_avail = 0;
1260 tomoyo_io_printf(head, "# select %s\n", data);
1261 head->read_single_domain = true;
1262 head->read_eof = !domain;
1263 if (domain) {
1264 struct tomoyo_domain_info *d;
1265 head->read_var1 = NULL;
1266 list_for_each_entry_rcu(d, &tomoyo_domain_list, list) {
1267 if (d == domain)
1268 break;
1269 head->read_var1 = &d->list;
1271 head->read_var2 = NULL;
1272 head->read_bit = 0;
1273 head->read_step = 0;
1274 if (domain->is_deleted)
1275 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1277 return true;
1281 * tomoyo_delete_domain - Delete a domain.
1283 * @domainname: The name of domain.
1285 * Returns 0.
1287 * Caller holds tomoyo_read_lock().
1289 static int tomoyo_delete_domain(char *domainname)
1291 struct tomoyo_domain_info *domain;
1292 struct tomoyo_path_info name;
1294 name.name = domainname;
1295 tomoyo_fill_path_info(&name);
1296 mutex_lock(&tomoyo_policy_lock);
1297 /* Is there an active domain? */
1298 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1299 /* Never delete tomoyo_kernel_domain */
1300 if (domain == &tomoyo_kernel_domain)
1301 continue;
1302 if (domain->is_deleted ||
1303 tomoyo_pathcmp(domain->domainname, &name))
1304 continue;
1305 domain->is_deleted = true;
1306 break;
1308 mutex_unlock(&tomoyo_policy_lock);
1309 return 0;
1313 * tomoyo_write_domain_policy - Write domain policy.
1315 * @head: Pointer to "struct tomoyo_io_buffer".
1317 * Returns 0 on success, negative value otherwise.
1319 * Caller holds tomoyo_read_lock().
1321 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
1323 char *data = head->write_buf;
1324 struct tomoyo_domain_info *domain = head->write_var1;
1325 bool is_delete = false;
1326 bool is_select = false;
1327 unsigned int profile;
1329 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
1330 is_delete = true;
1331 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
1332 is_select = true;
1333 if (is_select && tomoyo_is_select_one(head, data))
1334 return 0;
1335 /* Don't allow updating policies by non manager programs. */
1336 if (!tomoyo_is_policy_manager())
1337 return -EPERM;
1338 if (tomoyo_is_domain_def(data)) {
1339 domain = NULL;
1340 if (is_delete)
1341 tomoyo_delete_domain(data);
1342 else if (is_select)
1343 domain = tomoyo_find_domain(data);
1344 else
1345 domain = tomoyo_find_or_assign_new_domain(data, 0);
1346 head->write_var1 = domain;
1347 return 0;
1349 if (!domain)
1350 return -EINVAL;
1352 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
1353 && profile < TOMOYO_MAX_PROFILES) {
1354 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
1355 domain->profile = (u8) profile;
1356 return 0;
1358 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
1359 domain->ignore_global_allow_read = !is_delete;
1360 return 0;
1362 return tomoyo_write_file_policy(data, domain, is_delete);
1366 * tomoyo_print_path_acl - Print a single path ACL entry.
1368 * @head: Pointer to "struct tomoyo_io_buffer".
1369 * @ptr: Pointer to "struct tomoyo_path_acl".
1371 * Returns true on success, false otherwise.
1373 static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
1374 struct tomoyo_path_acl *ptr)
1376 int pos;
1377 u8 bit;
1378 const char *atmark = "";
1379 const char *filename;
1380 const u32 perm = ptr->perm | (((u32) ptr->perm_high) << 16);
1382 filename = ptr->filename->name;
1383 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1384 const char *msg;
1385 if (!(perm & (1 << bit)))
1386 continue;
1387 /* Print "read/write" instead of "read" and "write". */
1388 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE)
1389 && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
1390 continue;
1391 msg = tomoyo_path2keyword(bit);
1392 pos = head->read_avail;
1393 if (!tomoyo_io_printf(head, "allow_%s %s%s\n", msg,
1394 atmark, filename))
1395 goto out;
1397 head->read_bit = 0;
1398 return true;
1399 out:
1400 head->read_bit = bit;
1401 head->read_avail = pos;
1402 return false;
1406 * tomoyo_print_path2_acl - Print a double path ACL entry.
1408 * @head: Pointer to "struct tomoyo_io_buffer".
1409 * @ptr: Pointer to "struct tomoyo_path2_acl".
1411 * Returns true on success, false otherwise.
1413 static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
1414 struct tomoyo_path2_acl *ptr)
1416 int pos;
1417 const char *atmark1 = "";
1418 const char *atmark2 = "";
1419 const char *filename1;
1420 const char *filename2;
1421 const u8 perm = ptr->perm;
1422 u8 bit;
1424 filename1 = ptr->filename1->name;
1425 filename2 = ptr->filename2->name;
1426 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1427 const char *msg;
1428 if (!(perm & (1 << bit)))
1429 continue;
1430 msg = tomoyo_path22keyword(bit);
1431 pos = head->read_avail;
1432 if (!tomoyo_io_printf(head, "allow_%s %s%s %s%s\n", msg,
1433 atmark1, filename1, atmark2, filename2))
1434 goto out;
1436 head->read_bit = 0;
1437 return true;
1438 out:
1439 head->read_bit = bit;
1440 head->read_avail = pos;
1441 return false;
1445 * tomoyo_print_entry - Print an ACL entry.
1447 * @head: Pointer to "struct tomoyo_io_buffer".
1448 * @ptr: Pointer to an ACL entry.
1450 * Returns true on success, false otherwise.
1452 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1453 struct tomoyo_acl_info *ptr)
1455 const u8 acl_type = ptr->type;
1457 if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1458 struct tomoyo_path_acl *acl
1459 = container_of(ptr, struct tomoyo_path_acl, head);
1460 return tomoyo_print_path_acl(head, acl);
1462 if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1463 struct tomoyo_path2_acl *acl
1464 = container_of(ptr, struct tomoyo_path2_acl, head);
1465 return tomoyo_print_path2_acl(head, acl);
1467 BUG(); /* This must not happen. */
1468 return false;
1472 * tomoyo_read_domain_policy - Read domain policy.
1474 * @head: Pointer to "struct tomoyo_io_buffer".
1476 * Returns 0.
1478 * Caller holds tomoyo_read_lock().
1480 static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1482 struct list_head *dpos;
1483 struct list_head *apos;
1484 bool done = true;
1486 if (head->read_eof)
1487 return 0;
1488 if (head->read_step == 0)
1489 head->read_step = 1;
1490 list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
1491 struct tomoyo_domain_info *domain;
1492 const char *quota_exceeded = "";
1493 const char *transition_failed = "";
1494 const char *ignore_global_allow_read = "";
1495 domain = list_entry(dpos, struct tomoyo_domain_info, list);
1496 if (head->read_step != 1)
1497 goto acl_loop;
1498 if (domain->is_deleted && !head->read_single_domain)
1499 continue;
1500 /* Print domainname and flags. */
1501 if (domain->quota_warned)
1502 quota_exceeded = "quota_exceeded\n";
1503 if (domain->transition_failed)
1504 transition_failed = "transition_failed\n";
1505 if (domain->ignore_global_allow_read)
1506 ignore_global_allow_read
1507 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
1508 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
1509 "%u\n%s%s%s\n",
1510 domain->domainname->name,
1511 domain->profile, quota_exceeded,
1512 transition_failed,
1513 ignore_global_allow_read);
1514 if (!done)
1515 break;
1516 head->read_step = 2;
1517 acl_loop:
1518 if (head->read_step == 3)
1519 goto tail_mark;
1520 /* Print ACL entries in the domain. */
1521 list_for_each_cookie(apos, head->read_var2,
1522 &domain->acl_info_list) {
1523 struct tomoyo_acl_info *ptr
1524 = list_entry(apos, struct tomoyo_acl_info,
1525 list);
1526 done = tomoyo_print_entry(head, ptr);
1527 if (!done)
1528 break;
1530 if (!done)
1531 break;
1532 head->read_step = 3;
1533 tail_mark:
1534 done = tomoyo_io_printf(head, "\n");
1535 if (!done)
1536 break;
1537 head->read_step = 1;
1538 if (head->read_single_domain)
1539 break;
1541 head->read_eof = done;
1542 return 0;
1546 * tomoyo_write_domain_profile - Assign profile for specified domain.
1548 * @head: Pointer to "struct tomoyo_io_buffer".
1550 * Returns 0 on success, -EINVAL otherwise.
1552 * This is equivalent to doing
1554 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1555 * /usr/lib/ccs/loadpolicy -d
1557 * Caller holds tomoyo_read_lock().
1559 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1561 char *data = head->write_buf;
1562 char *cp = strchr(data, ' ');
1563 struct tomoyo_domain_info *domain;
1564 unsigned long profile;
1566 if (!cp)
1567 return -EINVAL;
1568 *cp = '\0';
1569 domain = tomoyo_find_domain(cp + 1);
1570 if (strict_strtoul(data, 10, &profile))
1571 return -EINVAL;
1572 if (domain && profile < TOMOYO_MAX_PROFILES
1573 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1574 domain->profile = (u8) profile;
1575 return 0;
1579 * tomoyo_read_domain_profile - Read only domainname and profile.
1581 * @head: Pointer to "struct tomoyo_io_buffer".
1583 * Returns list of profile number and domainname pairs.
1585 * This is equivalent to doing
1587 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1588 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1589 * domainname = $0; } else if ( $1 == "use_profile" ) {
1590 * print $2 " " domainname; domainname = ""; } } ; '
1592 * Caller holds tomoyo_read_lock().
1594 static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1596 struct list_head *pos;
1597 bool done = true;
1599 if (head->read_eof)
1600 return 0;
1601 list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
1602 struct tomoyo_domain_info *domain;
1603 domain = list_entry(pos, struct tomoyo_domain_info, list);
1604 if (domain->is_deleted)
1605 continue;
1606 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1607 domain->domainname->name);
1608 if (!done)
1609 break;
1611 head->read_eof = done;
1612 return 0;
1616 * tomoyo_write_pid: Specify PID to obtain domainname.
1618 * @head: Pointer to "struct tomoyo_io_buffer".
1620 * Returns 0.
1622 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1624 unsigned long pid;
1625 /* No error check. */
1626 strict_strtoul(head->write_buf, 10, &pid);
1627 head->read_step = (int) pid;
1628 head->read_eof = false;
1629 return 0;
1633 * tomoyo_read_pid - Get domainname of the specified PID.
1635 * @head: Pointer to "struct tomoyo_io_buffer".
1637 * Returns the domainname which the specified PID is in on success,
1638 * empty string otherwise.
1639 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1640 * using read()/write() interface rather than sysctl() interface.
1642 static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1644 if (head->read_avail == 0 && !head->read_eof) {
1645 const int pid = head->read_step;
1646 struct task_struct *p;
1647 struct tomoyo_domain_info *domain = NULL;
1648 read_lock(&tasklist_lock);
1649 p = find_task_by_vpid(pid);
1650 if (p)
1651 domain = tomoyo_real_domain(p);
1652 read_unlock(&tasklist_lock);
1653 if (domain)
1654 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1655 domain->domainname->name);
1656 head->read_eof = true;
1658 return 0;
1662 * tomoyo_write_exception_policy - Write exception policy.
1664 * @head: Pointer to "struct tomoyo_io_buffer".
1666 * Returns 0 on success, negative value otherwise.
1668 * Caller holds tomoyo_read_lock().
1670 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1672 char *data = head->write_buf;
1673 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1675 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1676 return tomoyo_write_domain_keeper_policy(data, false,
1677 is_delete);
1678 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
1679 return tomoyo_write_domain_keeper_policy(data, true, is_delete);
1680 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
1681 return tomoyo_write_domain_initializer_policy(data, false,
1682 is_delete);
1683 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1684 return tomoyo_write_domain_initializer_policy(data, true,
1685 is_delete);
1686 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
1687 return tomoyo_write_alias_policy(data, is_delete);
1688 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1689 return tomoyo_write_globally_readable_policy(data, is_delete);
1690 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1691 return tomoyo_write_pattern_policy(data, is_delete);
1692 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1693 return tomoyo_write_no_rewrite_policy(data, is_delete);
1694 return -EINVAL;
1698 * tomoyo_read_exception_policy - Read exception policy.
1700 * @head: Pointer to "struct tomoyo_io_buffer".
1702 * Returns 0 on success, -EINVAL otherwise.
1704 * Caller holds tomoyo_read_lock().
1706 static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1708 if (!head->read_eof) {
1709 switch (head->read_step) {
1710 case 0:
1711 head->read_var2 = NULL;
1712 head->read_step = 1;
1713 case 1:
1714 if (!tomoyo_read_domain_keeper_policy(head))
1715 break;
1716 head->read_var2 = NULL;
1717 head->read_step = 2;
1718 case 2:
1719 if (!tomoyo_read_globally_readable_policy(head))
1720 break;
1721 head->read_var2 = NULL;
1722 head->read_step = 3;
1723 case 3:
1724 head->read_var2 = NULL;
1725 head->read_step = 4;
1726 case 4:
1727 if (!tomoyo_read_domain_initializer_policy(head))
1728 break;
1729 head->read_var2 = NULL;
1730 head->read_step = 5;
1731 case 5:
1732 if (!tomoyo_read_alias_policy(head))
1733 break;
1734 head->read_var2 = NULL;
1735 head->read_step = 6;
1736 case 6:
1737 head->read_var2 = NULL;
1738 head->read_step = 7;
1739 case 7:
1740 if (!tomoyo_read_file_pattern(head))
1741 break;
1742 head->read_var2 = NULL;
1743 head->read_step = 8;
1744 case 8:
1745 if (!tomoyo_read_no_rewrite_policy(head))
1746 break;
1747 head->read_var2 = NULL;
1748 head->read_step = 9;
1749 case 9:
1750 head->read_eof = true;
1751 break;
1752 default:
1753 return -EINVAL;
1756 return 0;
1759 /* path to policy loader */
1760 static const char *tomoyo_loader = "/sbin/tomoyo-init";
1763 * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
1765 * Returns true if /sbin/tomoyo-init exists, false otherwise.
1767 static bool tomoyo_policy_loader_exists(void)
1770 * Don't activate MAC if the policy loader doesn't exist.
1771 * If the initrd includes /sbin/init but real-root-dev has not
1772 * mounted on / yet, activating MAC will block the system since
1773 * policies are not loaded yet.
1774 * Thus, let do_execve() call this function everytime.
1776 struct path path;
1778 if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
1779 printk(KERN_INFO "Not activating Mandatory Access Control now "
1780 "since %s doesn't exist.\n", tomoyo_loader);
1781 return false;
1783 path_put(&path);
1784 return true;
1788 * tomoyo_load_policy - Run external policy loader to load policy.
1790 * @filename: The program about to start.
1792 * This function checks whether @filename is /sbin/init , and if so
1793 * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
1794 * and then continues invocation of /sbin/init.
1795 * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
1796 * writes to /sys/kernel/security/tomoyo/ interfaces.
1798 * Returns nothing.
1800 void tomoyo_load_policy(const char *filename)
1802 char *argv[2];
1803 char *envp[3];
1805 if (tomoyo_policy_loaded)
1806 return;
1808 * Check filename is /sbin/init or /sbin/tomoyo-start.
1809 * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
1810 * be passed.
1811 * You can create /sbin/tomoyo-start by
1812 * "ln -s /bin/true /sbin/tomoyo-start".
1814 if (strcmp(filename, "/sbin/init") &&
1815 strcmp(filename, "/sbin/tomoyo-start"))
1816 return;
1817 if (!tomoyo_policy_loader_exists())
1818 return;
1820 printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
1821 tomoyo_loader);
1822 argv[0] = (char *) tomoyo_loader;
1823 argv[1] = NULL;
1824 envp[0] = "HOME=/";
1825 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
1826 envp[2] = NULL;
1827 call_usermodehelper(argv[0], argv, envp, 1);
1829 printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n");
1830 printk(KERN_INFO "Mandatory Access Control activated.\n");
1831 tomoyo_policy_loaded = true;
1832 { /* Check all profiles currently assigned to domains are defined. */
1833 struct tomoyo_domain_info *domain;
1834 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1835 const u8 profile = domain->profile;
1836 if (tomoyo_profile_ptr[profile])
1837 continue;
1838 panic("Profile %u (used by '%s') not defined.\n",
1839 profile, domain->domainname->name);
1845 * tomoyo_read_version: Get version.
1847 * @head: Pointer to "struct tomoyo_io_buffer".
1849 * Returns version information.
1851 static int tomoyo_read_version(struct tomoyo_io_buffer *head)
1853 if (!head->read_eof) {
1854 tomoyo_io_printf(head, "2.2.0");
1855 head->read_eof = true;
1857 return 0;
1861 * tomoyo_read_self_domain - Get the current process's domainname.
1863 * @head: Pointer to "struct tomoyo_io_buffer".
1865 * Returns the current process's domainname.
1867 static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1869 if (!head->read_eof) {
1871 * tomoyo_domain()->domainname != NULL
1872 * because every process belongs to a domain and
1873 * the domain's name cannot be NULL.
1875 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1876 head->read_eof = true;
1878 return 0;
1882 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1884 * @type: Type of interface.
1885 * @file: Pointer to "struct file".
1887 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1889 * Caller acquires tomoyo_read_lock().
1891 static int tomoyo_open_control(const u8 type, struct file *file)
1893 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_KERNEL);
1895 if (!head)
1896 return -ENOMEM;
1897 mutex_init(&head->io_sem);
1898 switch (type) {
1899 case TOMOYO_DOMAINPOLICY:
1900 /* /sys/kernel/security/tomoyo/domain_policy */
1901 head->write = tomoyo_write_domain_policy;
1902 head->read = tomoyo_read_domain_policy;
1903 break;
1904 case TOMOYO_EXCEPTIONPOLICY:
1905 /* /sys/kernel/security/tomoyo/exception_policy */
1906 head->write = tomoyo_write_exception_policy;
1907 head->read = tomoyo_read_exception_policy;
1908 break;
1909 case TOMOYO_SELFDOMAIN:
1910 /* /sys/kernel/security/tomoyo/self_domain */
1911 head->read = tomoyo_read_self_domain;
1912 break;
1913 case TOMOYO_DOMAIN_STATUS:
1914 /* /sys/kernel/security/tomoyo/.domain_status */
1915 head->write = tomoyo_write_domain_profile;
1916 head->read = tomoyo_read_domain_profile;
1917 break;
1918 case TOMOYO_PROCESS_STATUS:
1919 /* /sys/kernel/security/tomoyo/.process_status */
1920 head->write = tomoyo_write_pid;
1921 head->read = tomoyo_read_pid;
1922 break;
1923 case TOMOYO_VERSION:
1924 /* /sys/kernel/security/tomoyo/version */
1925 head->read = tomoyo_read_version;
1926 head->readbuf_size = 128;
1927 break;
1928 case TOMOYO_MEMINFO:
1929 /* /sys/kernel/security/tomoyo/meminfo */
1930 head->write = tomoyo_write_memory_quota;
1931 head->read = tomoyo_read_memory_counter;
1932 head->readbuf_size = 512;
1933 break;
1934 case TOMOYO_PROFILE:
1935 /* /sys/kernel/security/tomoyo/profile */
1936 head->write = tomoyo_write_profile;
1937 head->read = tomoyo_read_profile;
1938 break;
1939 case TOMOYO_MANAGER:
1940 /* /sys/kernel/security/tomoyo/manager */
1941 head->write = tomoyo_write_manager_policy;
1942 head->read = tomoyo_read_manager_policy;
1943 break;
1945 if (!(file->f_mode & FMODE_READ)) {
1947 * No need to allocate read_buf since it is not opened
1948 * for reading.
1950 head->read = NULL;
1951 } else {
1952 if (!head->readbuf_size)
1953 head->readbuf_size = 4096 * 2;
1954 head->read_buf = kzalloc(head->readbuf_size, GFP_KERNEL);
1955 if (!head->read_buf) {
1956 kfree(head);
1957 return -ENOMEM;
1960 if (!(file->f_mode & FMODE_WRITE)) {
1962 * No need to allocate write_buf since it is not opened
1963 * for writing.
1965 head->write = NULL;
1966 } else if (head->write) {
1967 head->writebuf_size = 4096 * 2;
1968 head->write_buf = kzalloc(head->writebuf_size, GFP_KERNEL);
1969 if (!head->write_buf) {
1970 kfree(head->read_buf);
1971 kfree(head);
1972 return -ENOMEM;
1975 head->reader_idx = tomoyo_read_lock();
1976 file->private_data = head;
1978 * Call the handler now if the file is
1979 * /sys/kernel/security/tomoyo/self_domain
1980 * so that the user can use
1981 * cat < /sys/kernel/security/tomoyo/self_domain"
1982 * to know the current process's domainname.
1984 if (type == TOMOYO_SELFDOMAIN)
1985 tomoyo_read_control(file, NULL, 0);
1986 return 0;
1990 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1992 * @file: Pointer to "struct file".
1993 * @buffer: Poiner to buffer to write to.
1994 * @buffer_len: Size of @buffer.
1996 * Returns bytes read on success, negative value otherwise.
1998 * Caller holds tomoyo_read_lock().
2000 static int tomoyo_read_control(struct file *file, char __user *buffer,
2001 const int buffer_len)
2003 int len = 0;
2004 struct tomoyo_io_buffer *head = file->private_data;
2005 char *cp;
2007 if (!head->read)
2008 return -ENOSYS;
2009 if (mutex_lock_interruptible(&head->io_sem))
2010 return -EINTR;
2011 /* Call the policy handler. */
2012 len = head->read(head);
2013 if (len < 0)
2014 goto out;
2015 /* Write to buffer. */
2016 len = head->read_avail;
2017 if (len > buffer_len)
2018 len = buffer_len;
2019 if (!len)
2020 goto out;
2021 /* head->read_buf changes by some functions. */
2022 cp = head->read_buf;
2023 if (copy_to_user(buffer, cp, len)) {
2024 len = -EFAULT;
2025 goto out;
2027 head->read_avail -= len;
2028 memmove(cp, cp + len, head->read_avail);
2029 out:
2030 mutex_unlock(&head->io_sem);
2031 return len;
2035 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2037 * @file: Pointer to "struct file".
2038 * @buffer: Pointer to buffer to read from.
2039 * @buffer_len: Size of @buffer.
2041 * Returns @buffer_len on success, negative value otherwise.
2043 * Caller holds tomoyo_read_lock().
2045 static int tomoyo_write_control(struct file *file, const char __user *buffer,
2046 const int buffer_len)
2048 struct tomoyo_io_buffer *head = file->private_data;
2049 int error = buffer_len;
2050 int avail_len = buffer_len;
2051 char *cp0 = head->write_buf;
2053 if (!head->write)
2054 return -ENOSYS;
2055 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2056 return -EFAULT;
2057 /* Don't allow updating policies by non manager programs. */
2058 if (head->write != tomoyo_write_pid &&
2059 head->write != tomoyo_write_domain_policy &&
2060 !tomoyo_is_policy_manager())
2061 return -EPERM;
2062 if (mutex_lock_interruptible(&head->io_sem))
2063 return -EINTR;
2064 /* Read a line and dispatch it to the policy handler. */
2065 while (avail_len > 0) {
2066 char c;
2067 if (head->write_avail >= head->writebuf_size - 1) {
2068 error = -ENOMEM;
2069 break;
2070 } else if (get_user(c, buffer)) {
2071 error = -EFAULT;
2072 break;
2074 buffer++;
2075 avail_len--;
2076 cp0[head->write_avail++] = c;
2077 if (c != '\n')
2078 continue;
2079 cp0[head->write_avail - 1] = '\0';
2080 head->write_avail = 0;
2081 tomoyo_normalize_line(cp0);
2082 head->write(head);
2084 mutex_unlock(&head->io_sem);
2085 return error;
2089 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2091 * @file: Pointer to "struct file".
2093 * Releases memory and returns 0.
2095 * Caller looses tomoyo_read_lock().
2097 static int tomoyo_close_control(struct file *file)
2099 struct tomoyo_io_buffer *head = file->private_data;
2100 const bool is_write = !!head->write_buf;
2102 tomoyo_read_unlock(head->reader_idx);
2103 /* Release memory used for policy I/O. */
2104 kfree(head->read_buf);
2105 head->read_buf = NULL;
2106 kfree(head->write_buf);
2107 head->write_buf = NULL;
2108 kfree(head);
2109 head = NULL;
2110 file->private_data = NULL;
2111 if (is_write)
2112 tomoyo_run_gc();
2113 return 0;
2117 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
2119 * @inode: Pointer to "struct inode".
2120 * @file: Pointer to "struct file".
2122 * Returns 0 on success, negative value otherwise.
2124 static int tomoyo_open(struct inode *inode, struct file *file)
2126 const int key = ((u8 *) file->f_path.dentry->d_inode->i_private)
2127 - ((u8 *) NULL);
2128 return tomoyo_open_control(key, file);
2132 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
2134 * @inode: Pointer to "struct inode".
2135 * @file: Pointer to "struct file".
2137 * Returns 0 on success, negative value otherwise.
2139 static int tomoyo_release(struct inode *inode, struct file *file)
2141 return tomoyo_close_control(file);
2145 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
2147 * @file: Pointer to "struct file".
2148 * @buf: Pointer to buffer.
2149 * @count: Size of @buf.
2150 * @ppos: Unused.
2152 * Returns bytes read on success, negative value otherwise.
2154 static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
2155 loff_t *ppos)
2157 return tomoyo_read_control(file, buf, count);
2161 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
2163 * @file: Pointer to "struct file".
2164 * @buf: Pointer to buffer.
2165 * @count: Size of @buf.
2166 * @ppos: Unused.
2168 * Returns @count on success, negative value otherwise.
2170 static ssize_t tomoyo_write(struct file *file, const char __user *buf,
2171 size_t count, loff_t *ppos)
2173 return tomoyo_write_control(file, buf, count);
2177 * tomoyo_operations is a "struct file_operations" which is used for handling
2178 * /sys/kernel/security/tomoyo/ interface.
2180 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
2181 * See tomoyo_io_buffer for internals.
2183 static const struct file_operations tomoyo_operations = {
2184 .open = tomoyo_open,
2185 .release = tomoyo_release,
2186 .read = tomoyo_read,
2187 .write = tomoyo_write,
2191 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
2193 * @name: The name of the interface file.
2194 * @mode: The permission of the interface file.
2195 * @parent: The parent directory.
2196 * @key: Type of interface.
2198 * Returns nothing.
2200 static void __init tomoyo_create_entry(const char *name, const mode_t mode,
2201 struct dentry *parent, const u8 key)
2203 securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
2204 &tomoyo_operations);
2208 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
2210 * Returns 0.
2212 static int __init tomoyo_initerface_init(void)
2214 struct dentry *tomoyo_dir;
2216 /* Don't create securityfs entries unless registered. */
2217 if (current_cred()->security != &tomoyo_kernel_domain)
2218 return 0;
2220 tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
2221 tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
2222 TOMOYO_DOMAINPOLICY);
2223 tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
2224 TOMOYO_EXCEPTIONPOLICY);
2225 tomoyo_create_entry("self_domain", 0400, tomoyo_dir,
2226 TOMOYO_SELFDOMAIN);
2227 tomoyo_create_entry(".domain_status", 0600, tomoyo_dir,
2228 TOMOYO_DOMAIN_STATUS);
2229 tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
2230 TOMOYO_PROCESS_STATUS);
2231 tomoyo_create_entry("meminfo", 0600, tomoyo_dir,
2232 TOMOYO_MEMINFO);
2233 tomoyo_create_entry("profile", 0600, tomoyo_dir,
2234 TOMOYO_PROFILE);
2235 tomoyo_create_entry("manager", 0600, tomoyo_dir,
2236 TOMOYO_MANAGER);
2237 tomoyo_create_entry("version", 0400, tomoyo_dir,
2238 TOMOYO_VERSION);
2239 return 0;
2242 fs_initcall(tomoyo_initerface_init);