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Kentaro Takeda95908372009-02-05 17:18:13 +09001/*
2 * security/tomoyo/common.c
3 *
4 * Common functions for TOMOYO.
5 *
6 * Copyright (C) 2005-2009 NTT DATA CORPORATION
7 *
Tetsuo Handa39826a12009-04-08 22:31:28 +09008 * Version: 2.2.0 2009/04/01
Kentaro Takeda95908372009-02-05 17:18:13 +09009 *
10 */
11
12#include <linux/uaccess.h>
13#include <linux/security.h>
14#include <linux/hardirq.h>
15#include "realpath.h"
16#include "common.h"
17#include "tomoyo.h"
18
19/* Has loading policy done? */
20bool tomoyo_policy_loaded;
21
22/* String table for functionality that takes 4 modes. */
23static const char *tomoyo_mode_4[4] = {
24 "disabled", "learning", "permissive", "enforcing"
25};
26/* String table for functionality that takes 2 modes. */
27static const char *tomoyo_mode_2[4] = {
28 "disabled", "enabled", "enabled", "enabled"
29};
30
Tetsuo Handac3fa1092009-06-08 12:37:39 +090031/*
32 * tomoyo_control_array is a static data which contains
33 *
34 * (1) functionality name used by /sys/kernel/security/tomoyo/profile .
35 * (2) initial values for "struct tomoyo_profile".
36 * (3) max values for "struct tomoyo_profile".
37 */
Kentaro Takeda95908372009-02-05 17:18:13 +090038static struct {
39 const char *keyword;
40 unsigned int current_value;
41 const unsigned int max_value;
42} tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = {
43 [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 },
44 [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX },
45 [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 },
46};
47
Tetsuo Handac3fa1092009-06-08 12:37:39 +090048/*
49 * tomoyo_profile is a structure which is used for holding the mode of access
50 * controls. TOMOYO has 4 modes: disabled, learning, permissive, enforcing.
51 * An administrator can define up to 256 profiles.
52 * The ->profile of "struct tomoyo_domain_info" is used for remembering
53 * the profile's number (0 - 255) assigned to that domain.
54 */
Kentaro Takeda95908372009-02-05 17:18:13 +090055static struct tomoyo_profile {
56 unsigned int value[TOMOYO_MAX_CONTROL_INDEX];
57 const struct tomoyo_path_info *comment;
58} *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
59
60/* Permit policy management by non-root user? */
61static bool tomoyo_manage_by_non_root;
62
63/* Utility functions. */
64
65/* Open operation for /sys/kernel/security/tomoyo/ interface. */
66static int tomoyo_open_control(const u8 type, struct file *file);
67/* Close /sys/kernel/security/tomoyo/ interface. */
68static int tomoyo_close_control(struct file *file);
69/* Read operation for /sys/kernel/security/tomoyo/ interface. */
70static int tomoyo_read_control(struct file *file, char __user *buffer,
71 const int buffer_len);
72/* Write operation for /sys/kernel/security/tomoyo/ interface. */
73static int tomoyo_write_control(struct file *file, const char __user *buffer,
74 const int buffer_len);
75
76/**
77 * tomoyo_is_byte_range - Check whether the string isa \ooo style octal value.
78 *
79 * @str: Pointer to the string.
80 *
81 * Returns true if @str is a \ooo style octal value, false otherwise.
82 *
83 * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
84 * This function verifies that \ooo is in valid range.
85 */
86static inline bool tomoyo_is_byte_range(const char *str)
87{
88 return *str >= '0' && *str++ <= '3' &&
89 *str >= '0' && *str++ <= '7' &&
90 *str >= '0' && *str <= '7';
91}
92
93/**
94 * tomoyo_is_alphabet_char - Check whether the character is an alphabet.
95 *
96 * @c: The character to check.
97 *
98 * Returns true if @c is an alphabet character, false otherwise.
99 */
100static inline bool tomoyo_is_alphabet_char(const char c)
101{
102 return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
103}
104
105/**
106 * tomoyo_make_byte - Make byte value from three octal characters.
107 *
108 * @c1: The first character.
109 * @c2: The second character.
110 * @c3: The third character.
111 *
112 * Returns byte value.
113 */
114static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
115{
116 return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
117}
118
119/**
120 * tomoyo_str_starts - Check whether the given string starts with the given keyword.
121 *
122 * @src: Pointer to pointer to the string.
123 * @find: Pointer to the keyword.
124 *
125 * Returns true if @src starts with @find, false otherwise.
126 *
127 * The @src is updated to point the first character after the @find
128 * if @src starts with @find.
129 */
130static bool tomoyo_str_starts(char **src, const char *find)
131{
132 const int len = strlen(find);
133 char *tmp = *src;
134
135 if (strncmp(tmp, find, len))
136 return false;
137 tmp += len;
138 *src = tmp;
139 return true;
140}
141
142/**
143 * tomoyo_normalize_line - Format string.
144 *
145 * @buffer: The line to normalize.
146 *
147 * Leading and trailing whitespaces are removed.
148 * Multiple whitespaces are packed into single space.
149 *
150 * Returns nothing.
151 */
152static void tomoyo_normalize_line(unsigned char *buffer)
153{
154 unsigned char *sp = buffer;
155 unsigned char *dp = buffer;
156 bool first = true;
157
158 while (tomoyo_is_invalid(*sp))
159 sp++;
160 while (*sp) {
161 if (!first)
162 *dp++ = ' ';
163 first = false;
164 while (tomoyo_is_valid(*sp))
165 *dp++ = *sp++;
166 while (tomoyo_is_invalid(*sp))
167 sp++;
168 }
169 *dp = '\0';
170}
171
172/**
173 * tomoyo_is_correct_path - Validate a pathname.
174 * @filename: The pathname to check.
175 * @start_type: Should the pathname start with '/'?
176 * 1 = must / -1 = must not / 0 = don't care
177 * @pattern_type: Can the pathname contain a wildcard?
178 * 1 = must / -1 = must not / 0 = don't care
179 * @end_type: Should the pathname end with '/'?
180 * 1 = must / -1 = must not / 0 = don't care
181 * @function: The name of function calling me.
182 *
183 * Check whether the given filename follows the naming rules.
184 * Returns true if @filename follows the naming rules, false otherwise.
185 */
186bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
187 const s8 pattern_type, const s8 end_type,
188 const char *function)
189{
190 bool contains_pattern = false;
191 unsigned char c;
192 unsigned char d;
193 unsigned char e;
194 const char *original_filename = filename;
195
196 if (!filename)
197 goto out;
198 c = *filename;
199 if (start_type == 1) { /* Must start with '/' */
200 if (c != '/')
201 goto out;
202 } else if (start_type == -1) { /* Must not start with '/' */
203 if (c == '/')
204 goto out;
205 }
206 if (c)
207 c = *(filename + strlen(filename) - 1);
208 if (end_type == 1) { /* Must end with '/' */
209 if (c != '/')
210 goto out;
211 } else if (end_type == -1) { /* Must not end with '/' */
212 if (c == '/')
213 goto out;
214 }
215 while ((c = *filename++) != '\0') {
216 if (c == '\\') {
217 switch ((c = *filename++)) {
218 case '\\': /* "\\" */
219 continue;
220 case '$': /* "\$" */
221 case '+': /* "\+" */
222 case '?': /* "\?" */
223 case '*': /* "\*" */
224 case '@': /* "\@" */
225 case 'x': /* "\x" */
226 case 'X': /* "\X" */
227 case 'a': /* "\a" */
228 case 'A': /* "\A" */
229 case '-': /* "\-" */
230 if (pattern_type == -1)
231 break; /* Must not contain pattern */
232 contains_pattern = true;
233 continue;
234 case '0': /* "\ooo" */
235 case '1':
236 case '2':
237 case '3':
238 d = *filename++;
239 if (d < '0' || d > '7')
240 break;
241 e = *filename++;
242 if (e < '0' || e > '7')
243 break;
244 c = tomoyo_make_byte(c, d, e);
245 if (tomoyo_is_invalid(c))
246 continue; /* pattern is not \000 */
247 }
248 goto out;
249 } else if (tomoyo_is_invalid(c)) {
250 goto out;
251 }
252 }
253 if (pattern_type == 1) { /* Must contain pattern */
254 if (!contains_pattern)
255 goto out;
256 }
257 return true;
258 out:
259 printk(KERN_DEBUG "%s: Invalid pathname '%s'\n", function,
260 original_filename);
261 return false;
262}
263
264/**
265 * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules.
266 * @domainname: The domainname to check.
267 * @function: The name of function calling me.
268 *
269 * Returns true if @domainname follows the naming rules, false otherwise.
270 */
271bool tomoyo_is_correct_domain(const unsigned char *domainname,
272 const char *function)
273{
274 unsigned char c;
275 unsigned char d;
276 unsigned char e;
277 const char *org_domainname = domainname;
278
279 if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
280 TOMOYO_ROOT_NAME_LEN))
281 goto out;
282 domainname += TOMOYO_ROOT_NAME_LEN;
283 if (!*domainname)
284 return true;
285 do {
286 if (*domainname++ != ' ')
287 goto out;
288 if (*domainname++ != '/')
289 goto out;
290 while ((c = *domainname) != '\0' && c != ' ') {
291 domainname++;
292 if (c == '\\') {
293 c = *domainname++;
294 switch ((c)) {
295 case '\\': /* "\\" */
296 continue;
297 case '0': /* "\ooo" */
298 case '1':
299 case '2':
300 case '3':
301 d = *domainname++;
302 if (d < '0' || d > '7')
303 break;
304 e = *domainname++;
305 if (e < '0' || e > '7')
306 break;
307 c = tomoyo_make_byte(c, d, e);
308 if (tomoyo_is_invalid(c))
309 /* pattern is not \000 */
310 continue;
311 }
312 goto out;
313 } else if (tomoyo_is_invalid(c)) {
314 goto out;
315 }
316 }
317 } while (*domainname);
318 return true;
319 out:
320 printk(KERN_DEBUG "%s: Invalid domainname '%s'\n", function,
321 org_domainname);
322 return false;
323}
324
325/**
326 * tomoyo_is_domain_def - Check whether the given token can be a domainname.
327 *
328 * @buffer: The token to check.
329 *
330 * Returns true if @buffer possibly be a domainname, false otherwise.
331 */
332bool tomoyo_is_domain_def(const unsigned char *buffer)
333{
334 return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN);
335}
336
337/**
338 * tomoyo_find_domain - Find a domain by the given name.
339 *
340 * @domainname: The domainname to find.
341 *
342 * Caller must call down_read(&tomoyo_domain_list_lock); or
343 * down_write(&tomoyo_domain_list_lock); .
344 *
345 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
346 */
347struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
348{
349 struct tomoyo_domain_info *domain;
350 struct tomoyo_path_info name;
351
352 name.name = domainname;
353 tomoyo_fill_path_info(&name);
354 list_for_each_entry(domain, &tomoyo_domain_list, list) {
355 if (!domain->is_deleted &&
356 !tomoyo_pathcmp(&name, domain->domainname))
357 return domain;
358 }
359 return NULL;
360}
361
362/**
363 * tomoyo_path_depth - Evaluate the number of '/' in a string.
364 *
365 * @pathname: The string to evaluate.
366 *
367 * Returns path depth of the string.
368 *
369 * I score 2 for each of the '/' in the @pathname
370 * and score 1 if the @pathname ends with '/'.
371 */
372static int tomoyo_path_depth(const char *pathname)
373{
374 int i = 0;
375
376 if (pathname) {
377 const char *ep = pathname + strlen(pathname);
378 if (pathname < ep--) {
379 if (*ep != '/')
380 i++;
381 while (pathname <= ep)
382 if (*ep-- == '/')
383 i += 2;
384 }
385 }
386 return i;
387}
388
389/**
390 * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
391 *
392 * @filename: The string to evaluate.
393 *
394 * Returns the initial length without a pattern in @filename.
395 */
396static int tomoyo_const_part_length(const char *filename)
397{
398 char c;
399 int len = 0;
400
401 if (!filename)
402 return 0;
403 while ((c = *filename++) != '\0') {
404 if (c != '\\') {
405 len++;
406 continue;
407 }
408 c = *filename++;
409 switch (c) {
410 case '\\': /* "\\" */
411 len += 2;
412 continue;
413 case '0': /* "\ooo" */
414 case '1':
415 case '2':
416 case '3':
417 c = *filename++;
418 if (c < '0' || c > '7')
419 break;
420 c = *filename++;
421 if (c < '0' || c > '7')
422 break;
423 len += 4;
424 continue;
425 }
426 break;
427 }
428 return len;
429}
430
431/**
432 * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
433 *
434 * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
435 *
436 * The caller sets "struct tomoyo_path_info"->name.
437 */
438void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
439{
440 const char *name = ptr->name;
441 const int len = strlen(name);
442
Kentaro Takeda95908372009-02-05 17:18:13 +0900443 ptr->const_len = tomoyo_const_part_length(name);
444 ptr->is_dir = len && (name[len - 1] == '/');
445 ptr->is_patterned = (ptr->const_len < len);
446 ptr->hash = full_name_hash(name, len);
447 ptr->depth = tomoyo_path_depth(name);
448}
449
450/**
451 * tomoyo_file_matches_to_pattern2 - Pattern matching without '/' character
452 * and "\-" pattern.
453 *
454 * @filename: The start of string to check.
455 * @filename_end: The end of string to check.
456 * @pattern: The start of pattern to compare.
457 * @pattern_end: The end of pattern to compare.
458 *
459 * Returns true if @filename matches @pattern, false otherwise.
460 */
461static bool tomoyo_file_matches_to_pattern2(const char *filename,
462 const char *filename_end,
463 const char *pattern,
464 const char *pattern_end)
465{
466 while (filename < filename_end && pattern < pattern_end) {
467 char c;
468 if (*pattern != '\\') {
469 if (*filename++ != *pattern++)
470 return false;
471 continue;
472 }
473 c = *filename;
474 pattern++;
475 switch (*pattern) {
476 int i;
477 int j;
478 case '?':
479 if (c == '/') {
480 return false;
481 } else if (c == '\\') {
482 if (filename[1] == '\\')
483 filename++;
484 else if (tomoyo_is_byte_range(filename + 1))
485 filename += 3;
486 else
487 return false;
488 }
489 break;
490 case '\\':
491 if (c != '\\')
492 return false;
493 if (*++filename != '\\')
494 return false;
495 break;
496 case '+':
497 if (!isdigit(c))
498 return false;
499 break;
500 case 'x':
501 if (!isxdigit(c))
502 return false;
503 break;
504 case 'a':
505 if (!tomoyo_is_alphabet_char(c))
506 return false;
507 break;
508 case '0':
509 case '1':
510 case '2':
511 case '3':
512 if (c == '\\' && tomoyo_is_byte_range(filename + 1)
513 && strncmp(filename + 1, pattern, 3) == 0) {
514 filename += 3;
515 pattern += 2;
516 break;
517 }
518 return false; /* Not matched. */
519 case '*':
520 case '@':
521 for (i = 0; i <= filename_end - filename; i++) {
522 if (tomoyo_file_matches_to_pattern2(
523 filename + i, filename_end,
524 pattern + 1, pattern_end))
525 return true;
526 c = filename[i];
527 if (c == '.' && *pattern == '@')
528 break;
529 if (c != '\\')
530 continue;
531 if (filename[i + 1] == '\\')
532 i++;
533 else if (tomoyo_is_byte_range(filename + i + 1))
534 i += 3;
535 else
536 break; /* Bad pattern. */
537 }
538 return false; /* Not matched. */
539 default:
540 j = 0;
541 c = *pattern;
542 if (c == '$') {
543 while (isdigit(filename[j]))
544 j++;
545 } else if (c == 'X') {
546 while (isxdigit(filename[j]))
547 j++;
548 } else if (c == 'A') {
549 while (tomoyo_is_alphabet_char(filename[j]))
550 j++;
551 }
552 for (i = 1; i <= j; i++) {
553 if (tomoyo_file_matches_to_pattern2(
554 filename + i, filename_end,
555 pattern + 1, pattern_end))
556 return true;
557 }
558 return false; /* Not matched or bad pattern. */
559 }
560 filename++;
561 pattern++;
562 }
563 while (*pattern == '\\' &&
564 (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
565 pattern += 2;
566 return filename == filename_end && pattern == pattern_end;
567}
568
569/**
570 * tomoyo_file_matches_to_pattern - Pattern matching without without '/' character.
571 *
572 * @filename: The start of string to check.
573 * @filename_end: The end of string to check.
574 * @pattern: The start of pattern to compare.
575 * @pattern_end: The end of pattern to compare.
576 *
577 * Returns true if @filename matches @pattern, false otherwise.
578 */
579static bool tomoyo_file_matches_to_pattern(const char *filename,
580 const char *filename_end,
581 const char *pattern,
582 const char *pattern_end)
583{
584 const char *pattern_start = pattern;
585 bool first = true;
586 bool result;
587
588 while (pattern < pattern_end - 1) {
589 /* Split at "\-" pattern. */
590 if (*pattern++ != '\\' || *pattern++ != '-')
591 continue;
592 result = tomoyo_file_matches_to_pattern2(filename,
593 filename_end,
594 pattern_start,
595 pattern - 2);
596 if (first)
597 result = !result;
598 if (result)
599 return false;
600 first = false;
601 pattern_start = pattern;
602 }
603 result = tomoyo_file_matches_to_pattern2(filename, filename_end,
604 pattern_start, pattern_end);
605 return first ? result : !result;
606}
607
608/**
609 * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
610 * @filename: The filename to check.
611 * @pattern: The pattern to compare.
612 *
613 * Returns true if matches, false otherwise.
614 *
615 * The following patterns are available.
616 * \\ \ itself.
617 * \ooo Octal representation of a byte.
618 * \* More than or equals to 0 character other than '/'.
619 * \@ More than or equals to 0 character other than '/' or '.'.
620 * \? 1 byte character other than '/'.
621 * \$ More than or equals to 1 decimal digit.
622 * \+ 1 decimal digit.
623 * \X More than or equals to 1 hexadecimal digit.
624 * \x 1 hexadecimal digit.
625 * \A More than or equals to 1 alphabet character.
626 * \a 1 alphabet character.
627 * \- Subtraction operator.
628 */
629bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
630 const struct tomoyo_path_info *pattern)
631{
632 /*
633 if (!filename || !pattern)
634 return false;
635 */
636 const char *f = filename->name;
637 const char *p = pattern->name;
638 const int len = pattern->const_len;
639
640 /* If @pattern doesn't contain pattern, I can use strcmp(). */
641 if (!pattern->is_patterned)
642 return !tomoyo_pathcmp(filename, pattern);
643 /* Dont compare if the number of '/' differs. */
644 if (filename->depth != pattern->depth)
645 return false;
646 /* Compare the initial length without patterns. */
647 if (strncmp(f, p, len))
648 return false;
649 f += len;
650 p += len;
651 /* Main loop. Compare each directory component. */
652 while (*f && *p) {
653 const char *f_delimiter = strchr(f, '/');
654 const char *p_delimiter = strchr(p, '/');
655 if (!f_delimiter)
656 f_delimiter = f + strlen(f);
657 if (!p_delimiter)
658 p_delimiter = p + strlen(p);
659 if (!tomoyo_file_matches_to_pattern(f, f_delimiter,
660 p, p_delimiter))
661 return false;
662 f = f_delimiter;
663 if (*f)
664 f++;
665 p = p_delimiter;
666 if (*p)
667 p++;
668 }
669 /* Ignore trailing "\*" and "\@" in @pattern. */
670 while (*p == '\\' &&
671 (*(p + 1) == '*' || *(p + 1) == '@'))
672 p += 2;
673 return !*f && !*p;
674}
675
676/**
677 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
678 *
679 * @head: Pointer to "struct tomoyo_io_buffer".
680 * @fmt: The printf()'s format string, followed by parameters.
681 *
682 * Returns true if output was written, false otherwise.
683 *
684 * The snprintf() will truncate, but tomoyo_io_printf() won't.
685 */
686bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
687{
688 va_list args;
689 int len;
690 int pos = head->read_avail;
691 int size = head->readbuf_size - pos;
692
693 if (size <= 0)
694 return false;
695 va_start(args, fmt);
696 len = vsnprintf(head->read_buf + pos, size, fmt, args);
697 va_end(args);
698 if (pos + len >= head->readbuf_size)
699 return false;
700 head->read_avail += len;
701 return true;
702}
703
704/**
705 * tomoyo_get_exe - Get tomoyo_realpath() of current process.
706 *
707 * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
708 *
709 * This function uses tomoyo_alloc(), so the caller must call tomoyo_free()
710 * if this function didn't return NULL.
711 */
712static const char *tomoyo_get_exe(void)
713{
714 struct mm_struct *mm = current->mm;
715 struct vm_area_struct *vma;
716 const char *cp = NULL;
717
718 if (!mm)
719 return NULL;
720 down_read(&mm->mmap_sem);
721 for (vma = mm->mmap; vma; vma = vma->vm_next) {
722 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
723 cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
724 break;
725 }
726 }
727 up_read(&mm->mmap_sem);
728 return cp;
729}
730
731/**
732 * tomoyo_get_msg - Get warning message.
733 *
734 * @is_enforce: Is it enforcing mode?
735 *
736 * Returns "ERROR" or "WARNING".
737 */
738const char *tomoyo_get_msg(const bool is_enforce)
739{
740 if (is_enforce)
741 return "ERROR";
742 else
743 return "WARNING";
744}
745
746/**
747 * tomoyo_check_flags - Check mode for specified functionality.
748 *
749 * @domain: Pointer to "struct tomoyo_domain_info".
750 * @index: The functionality to check mode.
751 *
752 * TOMOYO checks only process context.
753 * This code disables TOMOYO's enforcement in case the function is called from
754 * interrupt context.
755 */
756unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
757 const u8 index)
758{
759 const u8 profile = domain->profile;
760
761 if (WARN_ON(in_interrupt()))
762 return 0;
763 return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX
764#if TOMOYO_MAX_PROFILES != 256
765 && profile < TOMOYO_MAX_PROFILES
766#endif
767 && tomoyo_profile_ptr[profile] ?
768 tomoyo_profile_ptr[profile]->value[index] : 0;
769}
770
771/**
772 * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode.
773 *
774 * @domain: Pointer to "struct tomoyo_domain_info".
775 *
776 * Returns true if domain policy violation warning should be printed to
777 * console.
778 */
779bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain)
780{
781 return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0;
782}
783
784/**
785 * tomoyo_domain_quota_is_ok - Check for domain's quota.
786 *
787 * @domain: Pointer to "struct tomoyo_domain_info".
788 *
789 * Returns true if the domain is not exceeded quota, false otherwise.
790 */
791bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain)
792{
793 unsigned int count = 0;
794 struct tomoyo_acl_info *ptr;
795
796 if (!domain)
797 return true;
798 down_read(&tomoyo_domain_acl_info_list_lock);
799 list_for_each_entry(ptr, &domain->acl_info_list, list) {
800 if (ptr->type & TOMOYO_ACL_DELETED)
801 continue;
802 switch (tomoyo_acl_type2(ptr)) {
803 struct tomoyo_single_path_acl_record *acl1;
804 struct tomoyo_double_path_acl_record *acl2;
805 u16 perm;
806 case TOMOYO_TYPE_SINGLE_PATH_ACL:
807 acl1 = container_of(ptr,
808 struct tomoyo_single_path_acl_record,
809 head);
810 perm = acl1->perm;
811 if (perm & (1 << TOMOYO_TYPE_EXECUTE_ACL))
812 count++;
813 if (perm &
814 ((1 << TOMOYO_TYPE_READ_ACL) |
815 (1 << TOMOYO_TYPE_WRITE_ACL)))
816 count++;
817 if (perm & (1 << TOMOYO_TYPE_CREATE_ACL))
818 count++;
819 if (perm & (1 << TOMOYO_TYPE_UNLINK_ACL))
820 count++;
821 if (perm & (1 << TOMOYO_TYPE_MKDIR_ACL))
822 count++;
823 if (perm & (1 << TOMOYO_TYPE_RMDIR_ACL))
824 count++;
825 if (perm & (1 << TOMOYO_TYPE_MKFIFO_ACL))
826 count++;
827 if (perm & (1 << TOMOYO_TYPE_MKSOCK_ACL))
828 count++;
829 if (perm & (1 << TOMOYO_TYPE_MKBLOCK_ACL))
830 count++;
831 if (perm & (1 << TOMOYO_TYPE_MKCHAR_ACL))
832 count++;
833 if (perm & (1 << TOMOYO_TYPE_TRUNCATE_ACL))
834 count++;
835 if (perm & (1 << TOMOYO_TYPE_SYMLINK_ACL))
836 count++;
837 if (perm & (1 << TOMOYO_TYPE_REWRITE_ACL))
838 count++;
839 break;
840 case TOMOYO_TYPE_DOUBLE_PATH_ACL:
841 acl2 = container_of(ptr,
842 struct tomoyo_double_path_acl_record,
843 head);
844 perm = acl2->perm;
845 if (perm & (1 << TOMOYO_TYPE_LINK_ACL))
846 count++;
847 if (perm & (1 << TOMOYO_TYPE_RENAME_ACL))
848 count++;
849 break;
850 }
851 }
852 up_read(&tomoyo_domain_acl_info_list_lock);
853 if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
854 return true;
855 if (!domain->quota_warned) {
856 domain->quota_warned = true;
857 printk(KERN_WARNING "TOMOYO-WARNING: "
858 "Domain '%s' has so many ACLs to hold. "
859 "Stopped learning mode.\n", domain->domainname->name);
860 }
861 return false;
862}
863
864/**
865 * tomoyo_find_or_assign_new_profile - Create a new profile.
866 *
867 * @profile: Profile number to create.
868 *
869 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
870 */
871static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned
872 int profile)
873{
874 static DEFINE_MUTEX(lock);
875 struct tomoyo_profile *ptr = NULL;
876 int i;
877
878 if (profile >= TOMOYO_MAX_PROFILES)
879 return NULL;
Kentaro Takeda95908372009-02-05 17:18:13 +0900880 mutex_lock(&lock);
881 ptr = tomoyo_profile_ptr[profile];
882 if (ptr)
883 goto ok;
884 ptr = tomoyo_alloc_element(sizeof(*ptr));
885 if (!ptr)
886 goto ok;
887 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++)
888 ptr->value[i] = tomoyo_control_array[i].current_value;
889 mb(); /* Avoid out-of-order execution. */
890 tomoyo_profile_ptr[profile] = ptr;
891 ok:
892 mutex_unlock(&lock);
Kentaro Takeda95908372009-02-05 17:18:13 +0900893 return ptr;
894}
895
896/**
897 * tomoyo_write_profile - Write to profile table.
898 *
899 * @head: Pointer to "struct tomoyo_io_buffer".
900 *
901 * Returns 0 on success, negative value otherwise.
902 */
903static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
904{
905 char *data = head->write_buf;
906 unsigned int i;
907 unsigned int value;
908 char *cp;
909 struct tomoyo_profile *profile;
910 unsigned long num;
911
912 cp = strchr(data, '-');
913 if (cp)
914 *cp = '\0';
915 if (strict_strtoul(data, 10, &num))
916 return -EINVAL;
917 if (cp)
918 data = cp + 1;
919 profile = tomoyo_find_or_assign_new_profile(num);
920 if (!profile)
921 return -EINVAL;
922 cp = strchr(data, '=');
923 if (!cp)
924 return -EINVAL;
925 *cp = '\0';
926 if (!strcmp(data, "COMMENT")) {
927 profile->comment = tomoyo_save_name(cp + 1);
928 return 0;
929 }
930 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) {
931 if (strcmp(data, tomoyo_control_array[i].keyword))
932 continue;
933 if (sscanf(cp + 1, "%u", &value) != 1) {
934 int j;
935 const char **modes;
936 switch (i) {
937 case TOMOYO_VERBOSE:
938 modes = tomoyo_mode_2;
939 break;
940 default:
941 modes = tomoyo_mode_4;
942 break;
943 }
944 for (j = 0; j < 4; j++) {
945 if (strcmp(cp + 1, modes[j]))
946 continue;
947 value = j;
948 break;
949 }
950 if (j == 4)
951 return -EINVAL;
952 } else if (value > tomoyo_control_array[i].max_value) {
953 value = tomoyo_control_array[i].max_value;
954 }
955 profile->value[i] = value;
956 return 0;
957 }
958 return -EINVAL;
959}
960
961/**
962 * tomoyo_read_profile - Read from profile table.
963 *
964 * @head: Pointer to "struct tomoyo_io_buffer".
965 *
966 * Returns 0.
967 */
968static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
969{
970 static const int total = TOMOYO_MAX_CONTROL_INDEX + 1;
971 int step;
972
973 if (head->read_eof)
974 return 0;
975 for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total;
976 step++) {
977 const u8 index = step / total;
978 u8 type = step % total;
979 const struct tomoyo_profile *profile
980 = tomoyo_profile_ptr[index];
981 head->read_step = step;
982 if (!profile)
983 continue;
984 if (!type) { /* Print profile' comment tag. */
985 if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n",
986 index, profile->comment ?
987 profile->comment->name : ""))
988 break;
989 continue;
990 }
991 type--;
992 if (type < TOMOYO_MAX_CONTROL_INDEX) {
993 const unsigned int value = profile->value[type];
994 const char **modes = NULL;
995 const char *keyword
996 = tomoyo_control_array[type].keyword;
997 switch (tomoyo_control_array[type].max_value) {
998 case 3:
999 modes = tomoyo_mode_4;
1000 break;
1001 case 1:
1002 modes = tomoyo_mode_2;
1003 break;
1004 }
1005 if (modes) {
1006 if (!tomoyo_io_printf(head, "%u-%s=%s\n", index,
1007 keyword, modes[value]))
1008 break;
1009 } else {
1010 if (!tomoyo_io_printf(head, "%u-%s=%u\n", index,
1011 keyword, value))
1012 break;
1013 }
1014 }
1015 }
1016 if (step == TOMOYO_MAX_PROFILES * total)
1017 head->read_eof = true;
1018 return 0;
1019}
1020
Tetsuo Handac3fa1092009-06-08 12:37:39 +09001021/*
1022 * tomoyo_policy_manager_entry is a structure which is used for holding list of
1023 * domainnames or programs which are permitted to modify configuration via
1024 * /sys/kernel/security/tomoyo/ interface.
1025 * It has following fields.
1026 *
1027 * (1) "list" which is linked to tomoyo_policy_manager_list .
1028 * (2) "manager" is a domainname or a program's pathname.
1029 * (3) "is_domain" is a bool which is true if "manager" is a domainname, false
1030 * otherwise.
1031 * (4) "is_deleted" is a bool which is true if marked as deleted, false
1032 * otherwise.
1033 */
Kentaro Takeda95908372009-02-05 17:18:13 +09001034struct tomoyo_policy_manager_entry {
1035 struct list_head list;
1036 /* A path to program or a domainname. */
1037 const struct tomoyo_path_info *manager;
1038 bool is_domain; /* True if manager is a domainname. */
1039 bool is_deleted; /* True if this entry is deleted. */
1040};
1041
Tetsuo Handac3fa1092009-06-08 12:37:39 +09001042/*
1043 * tomoyo_policy_manager_list is used for holding list of domainnames or
1044 * programs which are permitted to modify configuration via
1045 * /sys/kernel/security/tomoyo/ interface.
1046 *
1047 * An entry is added by
1048 *
1049 * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
1050 * /sys/kernel/security/tomoyo/manager
1051 * (if you want to specify by a domainname)
1052 *
1053 * or
1054 *
1055 * # echo '/usr/lib/ccs/editpolicy' > /sys/kernel/security/tomoyo/manager
1056 * (if you want to specify by a program's location)
1057 *
1058 * and is deleted by
1059 *
1060 * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
1061 * /sys/kernel/security/tomoyo/manager
1062 *
1063 * or
1064 *
1065 * # echo 'delete /usr/lib/ccs/editpolicy' > \
1066 * /sys/kernel/security/tomoyo/manager
1067 *
1068 * and all entries are retrieved by
1069 *
1070 * # cat /sys/kernel/security/tomoyo/manager
1071 */
Kentaro Takeda95908372009-02-05 17:18:13 +09001072static LIST_HEAD(tomoyo_policy_manager_list);
1073static DECLARE_RWSEM(tomoyo_policy_manager_list_lock);
1074
1075/**
1076 * tomoyo_update_manager_entry - Add a manager entry.
1077 *
1078 * @manager: The path to manager or the domainnamme.
1079 * @is_delete: True if it is a delete request.
1080 *
1081 * Returns 0 on success, negative value otherwise.
1082 */
1083static int tomoyo_update_manager_entry(const char *manager,
1084 const bool is_delete)
1085{
1086 struct tomoyo_policy_manager_entry *new_entry;
1087 struct tomoyo_policy_manager_entry *ptr;
1088 const struct tomoyo_path_info *saved_manager;
1089 int error = -ENOMEM;
1090 bool is_domain = false;
1091
1092 if (tomoyo_is_domain_def(manager)) {
1093 if (!tomoyo_is_correct_domain(manager, __func__))
1094 return -EINVAL;
1095 is_domain = true;
1096 } else {
1097 if (!tomoyo_is_correct_path(manager, 1, -1, -1, __func__))
1098 return -EINVAL;
1099 }
1100 saved_manager = tomoyo_save_name(manager);
1101 if (!saved_manager)
1102 return -ENOMEM;
Kentaro Takeda95908372009-02-05 17:18:13 +09001103 down_write(&tomoyo_policy_manager_list_lock);
1104 list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
1105 if (ptr->manager != saved_manager)
1106 continue;
1107 ptr->is_deleted = is_delete;
1108 error = 0;
1109 goto out;
1110 }
1111 if (is_delete) {
1112 error = -ENOENT;
1113 goto out;
1114 }
1115 new_entry = tomoyo_alloc_element(sizeof(*new_entry));
1116 if (!new_entry)
1117 goto out;
1118 new_entry->manager = saved_manager;
1119 new_entry->is_domain = is_domain;
1120 list_add_tail(&new_entry->list, &tomoyo_policy_manager_list);
1121 error = 0;
1122 out:
1123 up_write(&tomoyo_policy_manager_list_lock);
Kentaro Takeda95908372009-02-05 17:18:13 +09001124 return error;
1125}
1126
1127/**
1128 * tomoyo_write_manager_policy - Write manager policy.
1129 *
1130 * @head: Pointer to "struct tomoyo_io_buffer".
1131 *
1132 * Returns 0 on success, negative value otherwise.
1133 */
1134static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
1135{
1136 char *data = head->write_buf;
1137 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1138
1139 if (!strcmp(data, "manage_by_non_root")) {
1140 tomoyo_manage_by_non_root = !is_delete;
1141 return 0;
1142 }
1143 return tomoyo_update_manager_entry(data, is_delete);
1144}
1145
1146/**
1147 * tomoyo_read_manager_policy - Read manager policy.
1148 *
1149 * @head: Pointer to "struct tomoyo_io_buffer".
1150 *
1151 * Returns 0.
1152 */
1153static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
1154{
1155 struct list_head *pos;
1156 bool done = true;
1157
1158 if (head->read_eof)
1159 return 0;
1160 down_read(&tomoyo_policy_manager_list_lock);
1161 list_for_each_cookie(pos, head->read_var2,
1162 &tomoyo_policy_manager_list) {
1163 struct tomoyo_policy_manager_entry *ptr;
1164 ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
1165 list);
1166 if (ptr->is_deleted)
1167 continue;
Tetsuo Handa7d2948b2009-06-02 20:42:24 +09001168 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
1169 if (!done)
Kentaro Takeda95908372009-02-05 17:18:13 +09001170 break;
Kentaro Takeda95908372009-02-05 17:18:13 +09001171 }
1172 up_read(&tomoyo_policy_manager_list_lock);
1173 head->read_eof = done;
1174 return 0;
1175}
1176
1177/**
1178 * tomoyo_is_policy_manager - Check whether the current process is a policy manager.
1179 *
1180 * Returns true if the current process is permitted to modify policy
1181 * via /sys/kernel/security/tomoyo/ interface.
1182 */
1183static bool tomoyo_is_policy_manager(void)
1184{
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;
1190
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 down_read(&tomoyo_policy_manager_list_lock);
1196 list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
1197 if (!ptr->is_deleted && ptr->is_domain
1198 && !tomoyo_pathcmp(domainname, ptr->manager)) {
1199 found = true;
1200 break;
1201 }
1202 }
1203 up_read(&tomoyo_policy_manager_list_lock);
1204 if (found)
1205 return true;
1206 exe = tomoyo_get_exe();
1207 if (!exe)
1208 return false;
1209 down_read(&tomoyo_policy_manager_list_lock);
1210 list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
1211 if (!ptr->is_deleted && !ptr->is_domain
1212 && !strcmp(exe, ptr->manager->name)) {
1213 found = true;
1214 break;
1215 }
1216 }
1217 up_read(&tomoyo_policy_manager_list_lock);
1218 if (!found) { /* Reduce error messages. */
1219 static pid_t last_pid;
1220 const pid_t pid = current->pid;
1221 if (last_pid != pid) {
1222 printk(KERN_WARNING "%s ( %s ) is not permitted to "
1223 "update policies.\n", domainname->name, exe);
1224 last_pid = pid;
1225 }
1226 }
1227 tomoyo_free(exe);
1228 return found;
1229}
1230
1231/**
1232 * tomoyo_is_select_one - Parse select command.
1233 *
1234 * @head: Pointer to "struct tomoyo_io_buffer".
1235 * @data: String to parse.
1236 *
1237 * Returns true on success, false otherwise.
1238 */
1239static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
1240 const char *data)
1241{
1242 unsigned int pid;
1243 struct tomoyo_domain_info *domain = NULL;
1244
1245 if (sscanf(data, "pid=%u", &pid) == 1) {
1246 struct task_struct *p;
Kentaro Takeda95908372009-02-05 17:18:13 +09001247 read_lock(&tasklist_lock);
1248 p = find_task_by_vpid(pid);
1249 if (p)
1250 domain = tomoyo_real_domain(p);
1251 read_unlock(&tasklist_lock);
Kentaro Takeda95908372009-02-05 17:18:13 +09001252 } else if (!strncmp(data, "domain=", 7)) {
1253 if (tomoyo_is_domain_def(data + 7)) {
1254 down_read(&tomoyo_domain_list_lock);
1255 domain = tomoyo_find_domain(data + 7);
1256 up_read(&tomoyo_domain_list_lock);
1257 }
1258 } else
1259 return false;
1260 head->write_var1 = domain;
1261 /* Accessing read_buf is safe because head->io_sem is held. */
1262 if (!head->read_buf)
1263 return true; /* Do nothing if open(O_WRONLY). */
1264 head->read_avail = 0;
1265 tomoyo_io_printf(head, "# select %s\n", data);
1266 head->read_single_domain = true;
1267 head->read_eof = !domain;
1268 if (domain) {
1269 struct tomoyo_domain_info *d;
1270 head->read_var1 = NULL;
1271 down_read(&tomoyo_domain_list_lock);
1272 list_for_each_entry(d, &tomoyo_domain_list, list) {
1273 if (d == domain)
1274 break;
1275 head->read_var1 = &d->list;
1276 }
1277 up_read(&tomoyo_domain_list_lock);
1278 head->read_var2 = NULL;
1279 head->read_bit = 0;
1280 head->read_step = 0;
1281 if (domain->is_deleted)
1282 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1283 }
1284 return true;
1285}
1286
1287/**
Tetsuo Handaccf135f2009-06-19 10:29:34 +09001288 * tomoyo_delete_domain - Delete a domain.
1289 *
1290 * @domainname: The name of domain.
1291 *
1292 * Returns 0.
1293 */
1294static int tomoyo_delete_domain(char *domainname)
1295{
1296 struct tomoyo_domain_info *domain;
1297 struct tomoyo_path_info name;
1298
1299 name.name = domainname;
1300 tomoyo_fill_path_info(&name);
1301 down_write(&tomoyo_domain_list_lock);
1302 /* Is there an active domain? */
1303 list_for_each_entry(domain, &tomoyo_domain_list, list) {
1304 /* Never delete tomoyo_kernel_domain */
1305 if (domain == &tomoyo_kernel_domain)
1306 continue;
1307 if (domain->is_deleted ||
1308 tomoyo_pathcmp(domain->domainname, &name))
1309 continue;
1310 domain->is_deleted = true;
1311 break;
1312 }
1313 up_write(&tomoyo_domain_list_lock);
1314 return 0;
1315}
1316
1317/**
Kentaro Takeda95908372009-02-05 17:18:13 +09001318 * tomoyo_write_domain_policy - Write domain policy.
1319 *
1320 * @head: Pointer to "struct tomoyo_io_buffer".
1321 *
1322 * Returns 0 on success, negative value otherwise.
1323 */
1324static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
1325{
1326 char *data = head->write_buf;
1327 struct tomoyo_domain_info *domain = head->write_var1;
1328 bool is_delete = false;
1329 bool is_select = false;
Kentaro Takeda95908372009-02-05 17:18:13 +09001330 unsigned int profile;
1331
1332 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
1333 is_delete = true;
1334 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
1335 is_select = true;
Kentaro Takeda95908372009-02-05 17:18:13 +09001336 if (is_select && tomoyo_is_select_one(head, data))
1337 return 0;
1338 /* Don't allow updating policies by non manager programs. */
1339 if (!tomoyo_is_policy_manager())
1340 return -EPERM;
1341 if (tomoyo_is_domain_def(data)) {
1342 domain = NULL;
1343 if (is_delete)
1344 tomoyo_delete_domain(data);
1345 else if (is_select) {
1346 down_read(&tomoyo_domain_list_lock);
1347 domain = tomoyo_find_domain(data);
1348 up_read(&tomoyo_domain_list_lock);
Tetsuo Handaa0558fc2009-04-06 20:49:14 +09001349 } else
Kentaro Takeda95908372009-02-05 17:18:13 +09001350 domain = tomoyo_find_or_assign_new_domain(data, 0);
1351 head->write_var1 = domain;
1352 return 0;
1353 }
1354 if (!domain)
1355 return -EINVAL;
1356
1357 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
1358 && profile < TOMOYO_MAX_PROFILES) {
1359 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
1360 domain->profile = (u8) profile;
1361 return 0;
1362 }
1363 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
1364 tomoyo_set_domain_flag(domain, is_delete,
1365 TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ);
1366 return 0;
1367 }
1368 return tomoyo_write_file_policy(data, domain, is_delete);
1369}
1370
1371/**
1372 * tomoyo_print_single_path_acl - Print a single path ACL entry.
1373 *
1374 * @head: Pointer to "struct tomoyo_io_buffer".
1375 * @ptr: Pointer to "struct tomoyo_single_path_acl_record".
1376 *
1377 * Returns true on success, false otherwise.
1378 */
1379static bool tomoyo_print_single_path_acl(struct tomoyo_io_buffer *head,
1380 struct tomoyo_single_path_acl_record *
1381 ptr)
1382{
1383 int pos;
1384 u8 bit;
1385 const char *atmark = "";
1386 const char *filename;
1387 const u16 perm = ptr->perm;
1388
1389 filename = ptr->filename->name;
1390 for (bit = head->read_bit; bit < TOMOYO_MAX_SINGLE_PATH_OPERATION;
1391 bit++) {
1392 const char *msg;
1393 if (!(perm & (1 << bit)))
1394 continue;
1395 /* Print "read/write" instead of "read" and "write". */
1396 if ((bit == TOMOYO_TYPE_READ_ACL ||
1397 bit == TOMOYO_TYPE_WRITE_ACL)
1398 && (perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)))
1399 continue;
1400 msg = tomoyo_sp2keyword(bit);
1401 pos = head->read_avail;
1402 if (!tomoyo_io_printf(head, "allow_%s %s%s\n", msg,
1403 atmark, filename))
1404 goto out;
1405 }
1406 head->read_bit = 0;
1407 return true;
1408 out:
1409 head->read_bit = bit;
1410 head->read_avail = pos;
1411 return false;
1412}
1413
1414/**
1415 * tomoyo_print_double_path_acl - Print a double path ACL entry.
1416 *
1417 * @head: Pointer to "struct tomoyo_io_buffer".
1418 * @ptr: Pointer to "struct tomoyo_double_path_acl_record".
1419 *
1420 * Returns true on success, false otherwise.
1421 */
1422static bool tomoyo_print_double_path_acl(struct tomoyo_io_buffer *head,
1423 struct tomoyo_double_path_acl_record *
1424 ptr)
1425{
1426 int pos;
1427 const char *atmark1 = "";
1428 const char *atmark2 = "";
1429 const char *filename1;
1430 const char *filename2;
1431 const u8 perm = ptr->perm;
1432 u8 bit;
1433
1434 filename1 = ptr->filename1->name;
1435 filename2 = ptr->filename2->name;
1436 for (bit = head->read_bit; bit < TOMOYO_MAX_DOUBLE_PATH_OPERATION;
1437 bit++) {
1438 const char *msg;
1439 if (!(perm & (1 << bit)))
1440 continue;
1441 msg = tomoyo_dp2keyword(bit);
1442 pos = head->read_avail;
1443 if (!tomoyo_io_printf(head, "allow_%s %s%s %s%s\n", msg,
1444 atmark1, filename1, atmark2, filename2))
1445 goto out;
1446 }
1447 head->read_bit = 0;
1448 return true;
1449 out:
1450 head->read_bit = bit;
1451 head->read_avail = pos;
1452 return false;
1453}
1454
1455/**
1456 * tomoyo_print_entry - Print an ACL entry.
1457 *
1458 * @head: Pointer to "struct tomoyo_io_buffer".
1459 * @ptr: Pointer to an ACL entry.
1460 *
1461 * Returns true on success, false otherwise.
1462 */
1463static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1464 struct tomoyo_acl_info *ptr)
1465{
1466 const u8 acl_type = tomoyo_acl_type2(ptr);
1467
1468 if (acl_type & TOMOYO_ACL_DELETED)
1469 return true;
1470 if (acl_type == TOMOYO_TYPE_SINGLE_PATH_ACL) {
1471 struct tomoyo_single_path_acl_record *acl
1472 = container_of(ptr,
1473 struct tomoyo_single_path_acl_record,
1474 head);
1475 return tomoyo_print_single_path_acl(head, acl);
1476 }
1477 if (acl_type == TOMOYO_TYPE_DOUBLE_PATH_ACL) {
1478 struct tomoyo_double_path_acl_record *acl
1479 = container_of(ptr,
1480 struct tomoyo_double_path_acl_record,
1481 head);
1482 return tomoyo_print_double_path_acl(head, acl);
1483 }
1484 BUG(); /* This must not happen. */
1485 return false;
1486}
1487
1488/**
1489 * tomoyo_read_domain_policy - Read domain policy.
1490 *
1491 * @head: Pointer to "struct tomoyo_io_buffer".
1492 *
1493 * Returns 0.
1494 */
1495static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1496{
1497 struct list_head *dpos;
1498 struct list_head *apos;
1499 bool done = true;
1500
1501 if (head->read_eof)
1502 return 0;
1503 if (head->read_step == 0)
1504 head->read_step = 1;
1505 down_read(&tomoyo_domain_list_lock);
1506 list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
1507 struct tomoyo_domain_info *domain;
1508 const char *quota_exceeded = "";
1509 const char *transition_failed = "";
1510 const char *ignore_global_allow_read = "";
1511 domain = list_entry(dpos, struct tomoyo_domain_info, list);
1512 if (head->read_step != 1)
1513 goto acl_loop;
1514 if (domain->is_deleted && !head->read_single_domain)
1515 continue;
1516 /* Print domainname and flags. */
1517 if (domain->quota_warned)
1518 quota_exceeded = "quota_exceeded\n";
1519 if (domain->flags & TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED)
1520 transition_failed = "transition_failed\n";
1521 if (domain->flags &
1522 TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ)
1523 ignore_global_allow_read
1524 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
Tetsuo Handa7d2948b2009-06-02 20:42:24 +09001525 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
1526 "%u\n%s%s%s\n",
1527 domain->domainname->name,
1528 domain->profile, quota_exceeded,
1529 transition_failed,
1530 ignore_global_allow_read);
1531 if (!done)
Kentaro Takeda95908372009-02-05 17:18:13 +09001532 break;
Kentaro Takeda95908372009-02-05 17:18:13 +09001533 head->read_step = 2;
1534acl_loop:
1535 if (head->read_step == 3)
1536 goto tail_mark;
1537 /* Print ACL entries in the domain. */
1538 down_read(&tomoyo_domain_acl_info_list_lock);
1539 list_for_each_cookie(apos, head->read_var2,
Tetsuo Handa7d2948b2009-06-02 20:42:24 +09001540 &domain->acl_info_list) {
Kentaro Takeda95908372009-02-05 17:18:13 +09001541 struct tomoyo_acl_info *ptr
1542 = list_entry(apos, struct tomoyo_acl_info,
Tetsuo Handa7d2948b2009-06-02 20:42:24 +09001543 list);
1544 done = tomoyo_print_entry(head, ptr);
1545 if (!done)
Kentaro Takeda95908372009-02-05 17:18:13 +09001546 break;
Kentaro Takeda95908372009-02-05 17:18:13 +09001547 }
1548 up_read(&tomoyo_domain_acl_info_list_lock);
1549 if (!done)
1550 break;
1551 head->read_step = 3;
1552tail_mark:
Tetsuo Handa7d2948b2009-06-02 20:42:24 +09001553 done = tomoyo_io_printf(head, "\n");
1554 if (!done)
Kentaro Takeda95908372009-02-05 17:18:13 +09001555 break;
Kentaro Takeda95908372009-02-05 17:18:13 +09001556 head->read_step = 1;
1557 if (head->read_single_domain)
1558 break;
1559 }
1560 up_read(&tomoyo_domain_list_lock);
1561 head->read_eof = done;
1562 return 0;
1563}
1564
1565/**
1566 * tomoyo_write_domain_profile - Assign profile for specified domain.
1567 *
1568 * @head: Pointer to "struct tomoyo_io_buffer".
1569 *
1570 * Returns 0 on success, -EINVAL otherwise.
1571 *
1572 * This is equivalent to doing
1573 *
1574 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1575 * /usr/lib/ccs/loadpolicy -d
1576 */
1577static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1578{
1579 char *data = head->write_buf;
1580 char *cp = strchr(data, ' ');
1581 struct tomoyo_domain_info *domain;
1582 unsigned long profile;
1583
1584 if (!cp)
1585 return -EINVAL;
1586 *cp = '\0';
1587 down_read(&tomoyo_domain_list_lock);
1588 domain = tomoyo_find_domain(cp + 1);
1589 up_read(&tomoyo_domain_list_lock);
1590 if (strict_strtoul(data, 10, &profile))
1591 return -EINVAL;
1592 if (domain && profile < TOMOYO_MAX_PROFILES
1593 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1594 domain->profile = (u8) profile;
1595 return 0;
1596}
1597
1598/**
1599 * tomoyo_read_domain_profile - Read only domainname and profile.
1600 *
1601 * @head: Pointer to "struct tomoyo_io_buffer".
1602 *
1603 * Returns list of profile number and domainname pairs.
1604 *
1605 * This is equivalent to doing
1606 *
1607 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1608 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1609 * domainname = $0; } else if ( $1 == "use_profile" ) {
1610 * print $2 " " domainname; domainname = ""; } } ; '
1611 */
1612static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1613{
1614 struct list_head *pos;
1615 bool done = true;
1616
1617 if (head->read_eof)
1618 return 0;
1619 down_read(&tomoyo_domain_list_lock);
1620 list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
1621 struct tomoyo_domain_info *domain;
1622 domain = list_entry(pos, struct tomoyo_domain_info, list);
1623 if (domain->is_deleted)
1624 continue;
Tetsuo Handa7d2948b2009-06-02 20:42:24 +09001625 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1626 domain->domainname->name);
1627 if (!done)
Kentaro Takeda95908372009-02-05 17:18:13 +09001628 break;
Kentaro Takeda95908372009-02-05 17:18:13 +09001629 }
1630 up_read(&tomoyo_domain_list_lock);
1631 head->read_eof = done;
1632 return 0;
1633}
1634
1635/**
1636 * tomoyo_write_pid: Specify PID to obtain domainname.
1637 *
1638 * @head: Pointer to "struct tomoyo_io_buffer".
1639 *
1640 * Returns 0.
1641 */
1642static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1643{
1644 unsigned long pid;
1645 /* No error check. */
1646 strict_strtoul(head->write_buf, 10, &pid);
1647 head->read_step = (int) pid;
1648 head->read_eof = false;
1649 return 0;
1650}
1651
1652/**
1653 * tomoyo_read_pid - Get domainname of the specified PID.
1654 *
1655 * @head: Pointer to "struct tomoyo_io_buffer".
1656 *
1657 * Returns the domainname which the specified PID is in on success,
1658 * empty string otherwise.
1659 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1660 * using read()/write() interface rather than sysctl() interface.
1661 */
1662static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1663{
1664 if (head->read_avail == 0 && !head->read_eof) {
1665 const int pid = head->read_step;
1666 struct task_struct *p;
1667 struct tomoyo_domain_info *domain = NULL;
Kentaro Takeda95908372009-02-05 17:18:13 +09001668 read_lock(&tasklist_lock);
1669 p = find_task_by_vpid(pid);
1670 if (p)
1671 domain = tomoyo_real_domain(p);
1672 read_unlock(&tasklist_lock);
Kentaro Takeda95908372009-02-05 17:18:13 +09001673 if (domain)
1674 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1675 domain->domainname->name);
1676 head->read_eof = true;
1677 }
1678 return 0;
1679}
1680
1681/**
1682 * tomoyo_write_exception_policy - Write exception policy.
1683 *
1684 * @head: Pointer to "struct tomoyo_io_buffer".
1685 *
1686 * Returns 0 on success, negative value otherwise.
1687 */
1688static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1689{
1690 char *data = head->write_buf;
1691 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1692
1693 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1694 return tomoyo_write_domain_keeper_policy(data, false,
1695 is_delete);
1696 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
1697 return tomoyo_write_domain_keeper_policy(data, true, is_delete);
1698 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
1699 return tomoyo_write_domain_initializer_policy(data, false,
1700 is_delete);
1701 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1702 return tomoyo_write_domain_initializer_policy(data, true,
1703 is_delete);
1704 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
1705 return tomoyo_write_alias_policy(data, is_delete);
1706 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1707 return tomoyo_write_globally_readable_policy(data, is_delete);
1708 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1709 return tomoyo_write_pattern_policy(data, is_delete);
1710 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1711 return tomoyo_write_no_rewrite_policy(data, is_delete);
1712 return -EINVAL;
1713}
1714
1715/**
1716 * tomoyo_read_exception_policy - Read exception policy.
1717 *
1718 * @head: Pointer to "struct tomoyo_io_buffer".
1719 *
1720 * Returns 0 on success, -EINVAL otherwise.
1721 */
1722static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1723{
1724 if (!head->read_eof) {
1725 switch (head->read_step) {
1726 case 0:
1727 head->read_var2 = NULL;
1728 head->read_step = 1;
1729 case 1:
1730 if (!tomoyo_read_domain_keeper_policy(head))
1731 break;
1732 head->read_var2 = NULL;
1733 head->read_step = 2;
1734 case 2:
1735 if (!tomoyo_read_globally_readable_policy(head))
1736 break;
1737 head->read_var2 = NULL;
1738 head->read_step = 3;
1739 case 3:
1740 head->read_var2 = NULL;
1741 head->read_step = 4;
1742 case 4:
1743 if (!tomoyo_read_domain_initializer_policy(head))
1744 break;
1745 head->read_var2 = NULL;
1746 head->read_step = 5;
1747 case 5:
1748 if (!tomoyo_read_alias_policy(head))
1749 break;
1750 head->read_var2 = NULL;
1751 head->read_step = 6;
1752 case 6:
1753 head->read_var2 = NULL;
1754 head->read_step = 7;
1755 case 7:
1756 if (!tomoyo_read_file_pattern(head))
1757 break;
1758 head->read_var2 = NULL;
1759 head->read_step = 8;
1760 case 8:
1761 if (!tomoyo_read_no_rewrite_policy(head))
1762 break;
1763 head->read_var2 = NULL;
1764 head->read_step = 9;
1765 case 9:
1766 head->read_eof = true;
1767 break;
1768 default:
1769 return -EINVAL;
1770 }
1771 }
1772 return 0;
1773}
1774
1775/* path to policy loader */
1776static const char *tomoyo_loader = "/sbin/tomoyo-init";
1777
1778/**
1779 * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
1780 *
1781 * Returns true if /sbin/tomoyo-init exists, false otherwise.
1782 */
1783static bool tomoyo_policy_loader_exists(void)
1784{
1785 /*
1786 * Don't activate MAC if the policy loader doesn't exist.
1787 * If the initrd includes /sbin/init but real-root-dev has not
1788 * mounted on / yet, activating MAC will block the system since
1789 * policies are not loaded yet.
1790 * Thus, let do_execve() call this function everytime.
1791 */
Al Viroe24977d2009-04-02 21:17:03 -04001792 struct path path;
Kentaro Takeda95908372009-02-05 17:18:13 +09001793
Al Viroe24977d2009-04-02 21:17:03 -04001794 if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
Kentaro Takeda95908372009-02-05 17:18:13 +09001795 printk(KERN_INFO "Not activating Mandatory Access Control now "
1796 "since %s doesn't exist.\n", tomoyo_loader);
1797 return false;
1798 }
Al Viroe24977d2009-04-02 21:17:03 -04001799 path_put(&path);
Kentaro Takeda95908372009-02-05 17:18:13 +09001800 return true;
1801}
1802
1803/**
1804 * tomoyo_load_policy - Run external policy loader to load policy.
1805 *
1806 * @filename: The program about to start.
1807 *
1808 * This function checks whether @filename is /sbin/init , and if so
1809 * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
1810 * and then continues invocation of /sbin/init.
1811 * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
1812 * writes to /sys/kernel/security/tomoyo/ interfaces.
1813 *
1814 * Returns nothing.
1815 */
1816void tomoyo_load_policy(const char *filename)
1817{
1818 char *argv[2];
1819 char *envp[3];
1820
1821 if (tomoyo_policy_loaded)
1822 return;
1823 /*
1824 * Check filename is /sbin/init or /sbin/tomoyo-start.
1825 * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
1826 * be passed.
1827 * You can create /sbin/tomoyo-start by
1828 * "ln -s /bin/true /sbin/tomoyo-start".
1829 */
1830 if (strcmp(filename, "/sbin/init") &&
1831 strcmp(filename, "/sbin/tomoyo-start"))
1832 return;
1833 if (!tomoyo_policy_loader_exists())
1834 return;
1835
1836 printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
1837 tomoyo_loader);
1838 argv[0] = (char *) tomoyo_loader;
1839 argv[1] = NULL;
1840 envp[0] = "HOME=/";
1841 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
1842 envp[2] = NULL;
1843 call_usermodehelper(argv[0], argv, envp, 1);
1844
Tetsuo Handa39826a12009-04-08 22:31:28 +09001845 printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n");
Kentaro Takeda95908372009-02-05 17:18:13 +09001846 printk(KERN_INFO "Mandatory Access Control activated.\n");
1847 tomoyo_policy_loaded = true;
1848 { /* Check all profiles currently assigned to domains are defined. */
1849 struct tomoyo_domain_info *domain;
1850 down_read(&tomoyo_domain_list_lock);
1851 list_for_each_entry(domain, &tomoyo_domain_list, list) {
1852 const u8 profile = domain->profile;
1853 if (tomoyo_profile_ptr[profile])
1854 continue;
1855 panic("Profile %u (used by '%s') not defined.\n",
1856 profile, domain->domainname->name);
1857 }
1858 up_read(&tomoyo_domain_list_lock);
1859 }
1860}
1861
1862/**
1863 * tomoyo_read_version: Get version.
1864 *
1865 * @head: Pointer to "struct tomoyo_io_buffer".
1866 *
1867 * Returns version information.
1868 */
1869static int tomoyo_read_version(struct tomoyo_io_buffer *head)
1870{
1871 if (!head->read_eof) {
Tetsuo Handa39826a12009-04-08 22:31:28 +09001872 tomoyo_io_printf(head, "2.2.0");
Kentaro Takeda95908372009-02-05 17:18:13 +09001873 head->read_eof = true;
1874 }
1875 return 0;
1876}
1877
1878/**
1879 * tomoyo_read_self_domain - Get the current process's domainname.
1880 *
1881 * @head: Pointer to "struct tomoyo_io_buffer".
1882 *
1883 * Returns the current process's domainname.
1884 */
1885static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1886{
1887 if (!head->read_eof) {
1888 /*
1889 * tomoyo_domain()->domainname != NULL
1890 * because every process belongs to a domain and
1891 * the domain's name cannot be NULL.
1892 */
1893 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1894 head->read_eof = true;
1895 }
1896 return 0;
1897}
1898
1899/**
1900 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1901 *
1902 * @type: Type of interface.
1903 * @file: Pointer to "struct file".
1904 *
1905 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1906 */
1907static int tomoyo_open_control(const u8 type, struct file *file)
1908{
1909 struct tomoyo_io_buffer *head = tomoyo_alloc(sizeof(*head));
1910
1911 if (!head)
1912 return -ENOMEM;
1913 mutex_init(&head->io_sem);
1914 switch (type) {
1915 case TOMOYO_DOMAINPOLICY:
1916 /* /sys/kernel/security/tomoyo/domain_policy */
1917 head->write = tomoyo_write_domain_policy;
1918 head->read = tomoyo_read_domain_policy;
1919 break;
1920 case TOMOYO_EXCEPTIONPOLICY:
1921 /* /sys/kernel/security/tomoyo/exception_policy */
1922 head->write = tomoyo_write_exception_policy;
1923 head->read = tomoyo_read_exception_policy;
1924 break;
1925 case TOMOYO_SELFDOMAIN:
1926 /* /sys/kernel/security/tomoyo/self_domain */
1927 head->read = tomoyo_read_self_domain;
1928 break;
1929 case TOMOYO_DOMAIN_STATUS:
1930 /* /sys/kernel/security/tomoyo/.domain_status */
1931 head->write = tomoyo_write_domain_profile;
1932 head->read = tomoyo_read_domain_profile;
1933 break;
1934 case TOMOYO_PROCESS_STATUS:
1935 /* /sys/kernel/security/tomoyo/.process_status */
1936 head->write = tomoyo_write_pid;
1937 head->read = tomoyo_read_pid;
1938 break;
1939 case TOMOYO_VERSION:
1940 /* /sys/kernel/security/tomoyo/version */
1941 head->read = tomoyo_read_version;
1942 head->readbuf_size = 128;
1943 break;
1944 case TOMOYO_MEMINFO:
1945 /* /sys/kernel/security/tomoyo/meminfo */
1946 head->write = tomoyo_write_memory_quota;
1947 head->read = tomoyo_read_memory_counter;
1948 head->readbuf_size = 512;
1949 break;
1950 case TOMOYO_PROFILE:
1951 /* /sys/kernel/security/tomoyo/profile */
1952 head->write = tomoyo_write_profile;
1953 head->read = tomoyo_read_profile;
1954 break;
1955 case TOMOYO_MANAGER:
1956 /* /sys/kernel/security/tomoyo/manager */
1957 head->write = tomoyo_write_manager_policy;
1958 head->read = tomoyo_read_manager_policy;
1959 break;
1960 }
1961 if (!(file->f_mode & FMODE_READ)) {
1962 /*
1963 * No need to allocate read_buf since it is not opened
1964 * for reading.
1965 */
1966 head->read = NULL;
1967 } else {
1968 if (!head->readbuf_size)
1969 head->readbuf_size = 4096 * 2;
1970 head->read_buf = tomoyo_alloc(head->readbuf_size);
1971 if (!head->read_buf) {
1972 tomoyo_free(head);
1973 return -ENOMEM;
1974 }
1975 }
1976 if (!(file->f_mode & FMODE_WRITE)) {
1977 /*
1978 * No need to allocate write_buf since it is not opened
1979 * for writing.
1980 */
1981 head->write = NULL;
1982 } else if (head->write) {
1983 head->writebuf_size = 4096 * 2;
1984 head->write_buf = tomoyo_alloc(head->writebuf_size);
1985 if (!head->write_buf) {
1986 tomoyo_free(head->read_buf);
1987 tomoyo_free(head);
1988 return -ENOMEM;
1989 }
1990 }
1991 file->private_data = head;
1992 /*
1993 * Call the handler now if the file is
1994 * /sys/kernel/security/tomoyo/self_domain
1995 * so that the user can use
1996 * cat < /sys/kernel/security/tomoyo/self_domain"
1997 * to know the current process's domainname.
1998 */
1999 if (type == TOMOYO_SELFDOMAIN)
2000 tomoyo_read_control(file, NULL, 0);
2001 return 0;
2002}
2003
2004/**
2005 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2006 *
2007 * @file: Pointer to "struct file".
2008 * @buffer: Poiner to buffer to write to.
2009 * @buffer_len: Size of @buffer.
2010 *
2011 * Returns bytes read on success, negative value otherwise.
2012 */
2013static int tomoyo_read_control(struct file *file, char __user *buffer,
2014 const int buffer_len)
2015{
2016 int len = 0;
2017 struct tomoyo_io_buffer *head = file->private_data;
2018 char *cp;
2019
2020 if (!head->read)
2021 return -ENOSYS;
2022 if (mutex_lock_interruptible(&head->io_sem))
2023 return -EINTR;
2024 /* Call the policy handler. */
2025 len = head->read(head);
2026 if (len < 0)
2027 goto out;
2028 /* Write to buffer. */
2029 len = head->read_avail;
2030 if (len > buffer_len)
2031 len = buffer_len;
2032 if (!len)
2033 goto out;
2034 /* head->read_buf changes by some functions. */
2035 cp = head->read_buf;
2036 if (copy_to_user(buffer, cp, len)) {
2037 len = -EFAULT;
2038 goto out;
2039 }
2040 head->read_avail -= len;
2041 memmove(cp, cp + len, head->read_avail);
2042 out:
2043 mutex_unlock(&head->io_sem);
2044 return len;
2045}
2046
2047/**
2048 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2049 *
2050 * @file: Pointer to "struct file".
2051 * @buffer: Pointer to buffer to read from.
2052 * @buffer_len: Size of @buffer.
2053 *
2054 * Returns @buffer_len on success, negative value otherwise.
2055 */
2056static int tomoyo_write_control(struct file *file, const char __user *buffer,
2057 const int buffer_len)
2058{
2059 struct tomoyo_io_buffer *head = file->private_data;
2060 int error = buffer_len;
2061 int avail_len = buffer_len;
2062 char *cp0 = head->write_buf;
2063
2064 if (!head->write)
2065 return -ENOSYS;
2066 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2067 return -EFAULT;
2068 /* Don't allow updating policies by non manager programs. */
2069 if (head->write != tomoyo_write_pid &&
2070 head->write != tomoyo_write_domain_policy &&
2071 !tomoyo_is_policy_manager())
2072 return -EPERM;
2073 if (mutex_lock_interruptible(&head->io_sem))
2074 return -EINTR;
2075 /* Read a line and dispatch it to the policy handler. */
2076 while (avail_len > 0) {
2077 char c;
2078 if (head->write_avail >= head->writebuf_size - 1) {
2079 error = -ENOMEM;
2080 break;
2081 } else if (get_user(c, buffer)) {
2082 error = -EFAULT;
2083 break;
2084 }
2085 buffer++;
2086 avail_len--;
2087 cp0[head->write_avail++] = c;
2088 if (c != '\n')
2089 continue;
2090 cp0[head->write_avail - 1] = '\0';
2091 head->write_avail = 0;
2092 tomoyo_normalize_line(cp0);
2093 head->write(head);
2094 }
2095 mutex_unlock(&head->io_sem);
2096 return error;
2097}
2098
2099/**
2100 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2101 *
2102 * @file: Pointer to "struct file".
2103 *
2104 * Releases memory and returns 0.
2105 */
2106static int tomoyo_close_control(struct file *file)
2107{
2108 struct tomoyo_io_buffer *head = file->private_data;
2109
2110 /* Release memory used for policy I/O. */
2111 tomoyo_free(head->read_buf);
2112 head->read_buf = NULL;
2113 tomoyo_free(head->write_buf);
2114 head->write_buf = NULL;
2115 tomoyo_free(head);
2116 head = NULL;
2117 file->private_data = NULL;
2118 return 0;
2119}
2120
2121/**
2122 * tomoyo_alloc_acl_element - Allocate permanent memory for ACL entry.
2123 *
2124 * @acl_type: Type of ACL entry.
2125 *
2126 * Returns pointer to the ACL entry on success, NULL otherwise.
2127 */
2128void *tomoyo_alloc_acl_element(const u8 acl_type)
2129{
2130 int len;
2131 struct tomoyo_acl_info *ptr;
2132
2133 switch (acl_type) {
2134 case TOMOYO_TYPE_SINGLE_PATH_ACL:
2135 len = sizeof(struct tomoyo_single_path_acl_record);
2136 break;
2137 case TOMOYO_TYPE_DOUBLE_PATH_ACL:
2138 len = sizeof(struct tomoyo_double_path_acl_record);
2139 break;
2140 default:
2141 return NULL;
2142 }
2143 ptr = tomoyo_alloc_element(len);
2144 if (!ptr)
2145 return NULL;
2146 ptr->type = acl_type;
2147 return ptr;
2148}
2149
2150/**
2151 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
2152 *
2153 * @inode: Pointer to "struct inode".
2154 * @file: Pointer to "struct file".
2155 *
2156 * Returns 0 on success, negative value otherwise.
2157 */
2158static int tomoyo_open(struct inode *inode, struct file *file)
2159{
2160 const int key = ((u8 *) file->f_path.dentry->d_inode->i_private)
2161 - ((u8 *) NULL);
2162 return tomoyo_open_control(key, file);
2163}
2164
2165/**
2166 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
2167 *
2168 * @inode: Pointer to "struct inode".
2169 * @file: Pointer to "struct file".
2170 *
2171 * Returns 0 on success, negative value otherwise.
2172 */
2173static int tomoyo_release(struct inode *inode, struct file *file)
2174{
2175 return tomoyo_close_control(file);
2176}
2177
2178/**
2179 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
2180 *
2181 * @file: Pointer to "struct file".
2182 * @buf: Pointer to buffer.
2183 * @count: Size of @buf.
2184 * @ppos: Unused.
2185 *
2186 * Returns bytes read on success, negative value otherwise.
2187 */
2188static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
2189 loff_t *ppos)
2190{
2191 return tomoyo_read_control(file, buf, count);
2192}
2193
2194/**
2195 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
2196 *
2197 * @file: Pointer to "struct file".
2198 * @buf: Pointer to buffer.
2199 * @count: Size of @buf.
2200 * @ppos: Unused.
2201 *
2202 * Returns @count on success, negative value otherwise.
2203 */
2204static ssize_t tomoyo_write(struct file *file, const char __user *buf,
2205 size_t count, loff_t *ppos)
2206{
2207 return tomoyo_write_control(file, buf, count);
2208}
2209
Tetsuo Handac3fa1092009-06-08 12:37:39 +09002210/*
2211 * tomoyo_operations is a "struct file_operations" which is used for handling
2212 * /sys/kernel/security/tomoyo/ interface.
2213 *
2214 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
2215 * See tomoyo_io_buffer for internals.
2216 */
Kentaro Takeda95908372009-02-05 17:18:13 +09002217static const struct file_operations tomoyo_operations = {
2218 .open = tomoyo_open,
2219 .release = tomoyo_release,
2220 .read = tomoyo_read,
2221 .write = tomoyo_write,
2222};
2223
2224/**
2225 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
2226 *
2227 * @name: The name of the interface file.
2228 * @mode: The permission of the interface file.
2229 * @parent: The parent directory.
2230 * @key: Type of interface.
2231 *
2232 * Returns nothing.
2233 */
2234static void __init tomoyo_create_entry(const char *name, const mode_t mode,
2235 struct dentry *parent, const u8 key)
2236{
2237 securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
2238 &tomoyo_operations);
2239}
2240
2241/**
2242 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
2243 *
2244 * Returns 0.
2245 */
2246static int __init tomoyo_initerface_init(void)
2247{
2248 struct dentry *tomoyo_dir;
2249
Tetsuo Handae5a3b952009-02-14 11:46:56 +09002250 /* Don't create securityfs entries unless registered. */
2251 if (current_cred()->security != &tomoyo_kernel_domain)
2252 return 0;
2253
Kentaro Takeda95908372009-02-05 17:18:13 +09002254 tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
2255 tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
2256 TOMOYO_DOMAINPOLICY);
2257 tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
2258 TOMOYO_EXCEPTIONPOLICY);
2259 tomoyo_create_entry("self_domain", 0400, tomoyo_dir,
2260 TOMOYO_SELFDOMAIN);
2261 tomoyo_create_entry(".domain_status", 0600, tomoyo_dir,
2262 TOMOYO_DOMAIN_STATUS);
2263 tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
2264 TOMOYO_PROCESS_STATUS);
2265 tomoyo_create_entry("meminfo", 0600, tomoyo_dir,
2266 TOMOYO_MEMINFO);
2267 tomoyo_create_entry("profile", 0600, tomoyo_dir,
2268 TOMOYO_PROFILE);
2269 tomoyo_create_entry("manager", 0600, tomoyo_dir,
2270 TOMOYO_MANAGER);
2271 tomoyo_create_entry("version", 0400, tomoyo_dir,
2272 TOMOYO_VERSION);
2273 return 0;
2274}
2275
2276fs_initcall(tomoyo_initerface_init);