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Commit | Line | Data |
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9590837b KT |
1 | /* |
2 | * security/tomoyo/common.c | |
3 | * | |
4 | * Common functions for TOMOYO. | |
5 | * | |
6 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
7 | * | |
39826a1e | 8 | * Version: 2.2.0 2009/04/01 |
9590837b KT |
9 | * |
10 | */ | |
11 | ||
12 | #include <linux/uaccess.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
9590837b KT |
14 | #include <linux/security.h> |
15 | #include <linux/hardirq.h> | |
9590837b | 16 | #include "common.h" |
9590837b | 17 | |
f737d95d TH |
18 | /* Lock for protecting policy. */ |
19 | DEFINE_MUTEX(tomoyo_policy_lock); | |
20 | ||
9590837b KT |
21 | /* Has loading policy done? */ |
22 | bool tomoyo_policy_loaded; | |
23 | ||
24 | /* String table for functionality that takes 4 modes. */ | |
25 | static const char *tomoyo_mode_4[4] = { | |
26 | "disabled", "learning", "permissive", "enforcing" | |
27 | }; | |
28 | /* String table for functionality that takes 2 modes. */ | |
29 | static const char *tomoyo_mode_2[4] = { | |
30 | "disabled", "enabled", "enabled", "enabled" | |
31 | }; | |
32 | ||
c3fa109a TH |
33 | /* |
34 | * tomoyo_control_array is a static data which contains | |
35 | * | |
36 | * (1) functionality name used by /sys/kernel/security/tomoyo/profile . | |
37 | * (2) initial values for "struct tomoyo_profile". | |
38 | * (3) max values for "struct tomoyo_profile". | |
39 | */ | |
9590837b KT |
40 | static struct { |
41 | const char *keyword; | |
42 | unsigned int current_value; | |
43 | const unsigned int max_value; | |
44 | } tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = { | |
45 | [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 }, | |
46 | [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX }, | |
47 | [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 }, | |
48 | }; | |
49 | ||
c3fa109a TH |
50 | /* |
51 | * tomoyo_profile is a structure which is used for holding the mode of access | |
52 | * controls. TOMOYO has 4 modes: disabled, learning, permissive, enforcing. | |
53 | * An administrator can define up to 256 profiles. | |
54 | * The ->profile of "struct tomoyo_domain_info" is used for remembering | |
55 | * the profile's number (0 - 255) assigned to that domain. | |
56 | */ | |
9590837b KT |
57 | static struct tomoyo_profile { |
58 | unsigned int value[TOMOYO_MAX_CONTROL_INDEX]; | |
59 | const struct tomoyo_path_info *comment; | |
60 | } *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES]; | |
61 | ||
62 | /* Permit policy management by non-root user? */ | |
63 | static bool tomoyo_manage_by_non_root; | |
64 | ||
65 | /* Utility functions. */ | |
66 | ||
67 | /* Open operation for /sys/kernel/security/tomoyo/ interface. */ | |
68 | static int tomoyo_open_control(const u8 type, struct file *file); | |
69 | /* Close /sys/kernel/security/tomoyo/ interface. */ | |
70 | static int tomoyo_close_control(struct file *file); | |
71 | /* Read operation for /sys/kernel/security/tomoyo/ interface. */ | |
72 | static int tomoyo_read_control(struct file *file, char __user *buffer, | |
73 | const int buffer_len); | |
74 | /* Write operation for /sys/kernel/security/tomoyo/ interface. */ | |
75 | static int tomoyo_write_control(struct file *file, const char __user *buffer, | |
76 | const int buffer_len); | |
77 | ||
7762fbff TH |
78 | /** |
79 | * tomoyo_parse_name_union - Parse a tomoyo_name_union. | |
80 | * | |
81 | * @filename: Name or name group. | |
82 | * @ptr: Pointer to "struct tomoyo_name_union". | |
83 | * | |
84 | * Returns true on success, false otherwise. | |
85 | */ | |
86 | bool tomoyo_parse_name_union(const char *filename, | |
87 | struct tomoyo_name_union *ptr) | |
88 | { | |
89 | if (!tomoyo_is_correct_path(filename, 0, 0, 0)) | |
90 | return false; | |
91 | if (filename[0] == '@') { | |
92 | ptr->group = tomoyo_get_path_group(filename + 1); | |
93 | ptr->is_group = true; | |
94 | return ptr->group != NULL; | |
95 | } | |
96 | ptr->filename = tomoyo_get_name(filename); | |
97 | ptr->is_group = false; | |
98 | return ptr->filename != NULL; | |
99 | } | |
100 | ||
101 | /** | |
102 | * tomoyo_print_name_union - Print a tomoyo_name_union. | |
103 | * | |
104 | * @head: Pointer to "struct tomoyo_io_buffer". | |
105 | * @ptr: Pointer to "struct tomoyo_name_union". | |
106 | * | |
107 | * Returns true on success, false otherwise. | |
108 | */ | |
109 | static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head, | |
110 | const struct tomoyo_name_union *ptr) | |
111 | { | |
112 | int pos = head->read_avail; | |
113 | if (pos && head->read_buf[pos - 1] == ' ') | |
114 | head->read_avail--; | |
115 | if (ptr->is_group) | |
116 | return tomoyo_io_printf(head, " @%s", | |
117 | ptr->group->group_name->name); | |
118 | return tomoyo_io_printf(head, " %s", ptr->filename->name); | |
119 | } | |
120 | ||
9590837b KT |
121 | /** |
122 | * tomoyo_is_byte_range - Check whether the string isa \ooo style octal value. | |
123 | * | |
124 | * @str: Pointer to the string. | |
125 | * | |
126 | * Returns true if @str is a \ooo style octal value, false otherwise. | |
127 | * | |
128 | * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF. | |
129 | * This function verifies that \ooo is in valid range. | |
130 | */ | |
131 | static inline bool tomoyo_is_byte_range(const char *str) | |
132 | { | |
133 | return *str >= '0' && *str++ <= '3' && | |
134 | *str >= '0' && *str++ <= '7' && | |
135 | *str >= '0' && *str <= '7'; | |
136 | } | |
137 | ||
138 | /** | |
139 | * tomoyo_is_alphabet_char - Check whether the character is an alphabet. | |
140 | * | |
141 | * @c: The character to check. | |
142 | * | |
143 | * Returns true if @c is an alphabet character, false otherwise. | |
144 | */ | |
145 | static inline bool tomoyo_is_alphabet_char(const char c) | |
146 | { | |
147 | return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'); | |
148 | } | |
149 | ||
150 | /** | |
151 | * tomoyo_make_byte - Make byte value from three octal characters. | |
152 | * | |
153 | * @c1: The first character. | |
154 | * @c2: The second character. | |
155 | * @c3: The third character. | |
156 | * | |
157 | * Returns byte value. | |
158 | */ | |
159 | static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3) | |
160 | { | |
161 | return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0'); | |
162 | } | |
163 | ||
164 | /** | |
165 | * tomoyo_str_starts - Check whether the given string starts with the given keyword. | |
166 | * | |
167 | * @src: Pointer to pointer to the string. | |
168 | * @find: Pointer to the keyword. | |
169 | * | |
170 | * Returns true if @src starts with @find, false otherwise. | |
171 | * | |
172 | * The @src is updated to point the first character after the @find | |
173 | * if @src starts with @find. | |
174 | */ | |
175 | static bool tomoyo_str_starts(char **src, const char *find) | |
176 | { | |
177 | const int len = strlen(find); | |
178 | char *tmp = *src; | |
179 | ||
180 | if (strncmp(tmp, find, len)) | |
181 | return false; | |
182 | tmp += len; | |
183 | *src = tmp; | |
184 | return true; | |
185 | } | |
186 | ||
187 | /** | |
188 | * tomoyo_normalize_line - Format string. | |
189 | * | |
190 | * @buffer: The line to normalize. | |
191 | * | |
192 | * Leading and trailing whitespaces are removed. | |
193 | * Multiple whitespaces are packed into single space. | |
194 | * | |
195 | * Returns nothing. | |
196 | */ | |
197 | static void tomoyo_normalize_line(unsigned char *buffer) | |
198 | { | |
199 | unsigned char *sp = buffer; | |
200 | unsigned char *dp = buffer; | |
201 | bool first = true; | |
202 | ||
203 | while (tomoyo_is_invalid(*sp)) | |
204 | sp++; | |
205 | while (*sp) { | |
206 | if (!first) | |
207 | *dp++ = ' '; | |
208 | first = false; | |
209 | while (tomoyo_is_valid(*sp)) | |
210 | *dp++ = *sp++; | |
211 | while (tomoyo_is_invalid(*sp)) | |
212 | sp++; | |
213 | } | |
214 | *dp = '\0'; | |
215 | } | |
216 | ||
7762fbff TH |
217 | /** |
218 | * tomoyo_tokenize - Tokenize string. | |
219 | * | |
220 | * @buffer: The line to tokenize. | |
221 | * @w: Pointer to "char *". | |
222 | * @size: Sizeof @w . | |
223 | * | |
224 | * Returns true on success, false otherwise. | |
225 | */ | |
226 | bool tomoyo_tokenize(char *buffer, char *w[], size_t size) | |
227 | { | |
228 | int count = size / sizeof(char *); | |
229 | int i; | |
230 | for (i = 0; i < count; i++) | |
231 | w[i] = ""; | |
232 | for (i = 0; i < count; i++) { | |
233 | char *cp = strchr(buffer, ' '); | |
234 | if (cp) | |
235 | *cp = '\0'; | |
236 | w[i] = buffer; | |
237 | if (!cp) | |
238 | break; | |
239 | buffer = cp + 1; | |
240 | } | |
241 | return i < count || !*buffer; | |
242 | } | |
243 | ||
9590837b KT |
244 | /** |
245 | * tomoyo_is_correct_path - Validate a pathname. | |
246 | * @filename: The pathname to check. | |
247 | * @start_type: Should the pathname start with '/'? | |
248 | * 1 = must / -1 = must not / 0 = don't care | |
249 | * @pattern_type: Can the pathname contain a wildcard? | |
250 | * 1 = must / -1 = must not / 0 = don't care | |
251 | * @end_type: Should the pathname end with '/'? | |
252 | * 1 = must / -1 = must not / 0 = don't care | |
9590837b KT |
253 | * |
254 | * Check whether the given filename follows the naming rules. | |
255 | * Returns true if @filename follows the naming rules, false otherwise. | |
256 | */ | |
257 | bool tomoyo_is_correct_path(const char *filename, const s8 start_type, | |
17080008 | 258 | const s8 pattern_type, const s8 end_type) |
9590837b | 259 | { |
7539cf4b TH |
260 | const char *const start = filename; |
261 | bool in_repetition = false; | |
9590837b KT |
262 | bool contains_pattern = false; |
263 | unsigned char c; | |
264 | unsigned char d; | |
265 | unsigned char e; | |
9590837b KT |
266 | |
267 | if (!filename) | |
268 | goto out; | |
269 | c = *filename; | |
270 | if (start_type == 1) { /* Must start with '/' */ | |
271 | if (c != '/') | |
272 | goto out; | |
273 | } else if (start_type == -1) { /* Must not start with '/' */ | |
274 | if (c == '/') | |
275 | goto out; | |
276 | } | |
277 | if (c) | |
278 | c = *(filename + strlen(filename) - 1); | |
279 | if (end_type == 1) { /* Must end with '/' */ | |
280 | if (c != '/') | |
281 | goto out; | |
282 | } else if (end_type == -1) { /* Must not end with '/' */ | |
283 | if (c == '/') | |
284 | goto out; | |
285 | } | |
7539cf4b TH |
286 | while (1) { |
287 | c = *filename++; | |
288 | if (!c) | |
289 | break; | |
9590837b | 290 | if (c == '\\') { |
7539cf4b TH |
291 | c = *filename++; |
292 | switch (c) { | |
9590837b KT |
293 | case '\\': /* "\\" */ |
294 | continue; | |
295 | case '$': /* "\$" */ | |
296 | case '+': /* "\+" */ | |
297 | case '?': /* "\?" */ | |
298 | case '*': /* "\*" */ | |
299 | case '@': /* "\@" */ | |
300 | case 'x': /* "\x" */ | |
301 | case 'X': /* "\X" */ | |
302 | case 'a': /* "\a" */ | |
303 | case 'A': /* "\A" */ | |
304 | case '-': /* "\-" */ | |
305 | if (pattern_type == -1) | |
306 | break; /* Must not contain pattern */ | |
307 | contains_pattern = true; | |
308 | continue; | |
7539cf4b TH |
309 | case '{': /* "/\{" */ |
310 | if (filename - 3 < start || | |
311 | *(filename - 3) != '/') | |
312 | break; | |
313 | if (pattern_type == -1) | |
314 | break; /* Must not contain pattern */ | |
315 | contains_pattern = true; | |
316 | in_repetition = true; | |
317 | continue; | |
318 | case '}': /* "\}/" */ | |
319 | if (*filename != '/') | |
320 | break; | |
321 | if (!in_repetition) | |
322 | break; | |
323 | in_repetition = false; | |
324 | continue; | |
9590837b KT |
325 | case '0': /* "\ooo" */ |
326 | case '1': | |
327 | case '2': | |
328 | case '3': | |
329 | d = *filename++; | |
330 | if (d < '0' || d > '7') | |
331 | break; | |
332 | e = *filename++; | |
333 | if (e < '0' || e > '7') | |
334 | break; | |
335 | c = tomoyo_make_byte(c, d, e); | |
336 | if (tomoyo_is_invalid(c)) | |
337 | continue; /* pattern is not \000 */ | |
338 | } | |
339 | goto out; | |
7539cf4b TH |
340 | } else if (in_repetition && c == '/') { |
341 | goto out; | |
9590837b KT |
342 | } else if (tomoyo_is_invalid(c)) { |
343 | goto out; | |
344 | } | |
345 | } | |
346 | if (pattern_type == 1) { /* Must contain pattern */ | |
347 | if (!contains_pattern) | |
348 | goto out; | |
349 | } | |
7539cf4b TH |
350 | if (in_repetition) |
351 | goto out; | |
9590837b KT |
352 | return true; |
353 | out: | |
9590837b KT |
354 | return false; |
355 | } | |
356 | ||
357 | /** | |
358 | * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules. | |
359 | * @domainname: The domainname to check. | |
9590837b KT |
360 | * |
361 | * Returns true if @domainname follows the naming rules, false otherwise. | |
362 | */ | |
17080008 | 363 | bool tomoyo_is_correct_domain(const unsigned char *domainname) |
9590837b KT |
364 | { |
365 | unsigned char c; | |
366 | unsigned char d; | |
367 | unsigned char e; | |
9590837b KT |
368 | |
369 | if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME, | |
370 | TOMOYO_ROOT_NAME_LEN)) | |
371 | goto out; | |
372 | domainname += TOMOYO_ROOT_NAME_LEN; | |
373 | if (!*domainname) | |
374 | return true; | |
375 | do { | |
376 | if (*domainname++ != ' ') | |
377 | goto out; | |
378 | if (*domainname++ != '/') | |
379 | goto out; | |
380 | while ((c = *domainname) != '\0' && c != ' ') { | |
381 | domainname++; | |
382 | if (c == '\\') { | |
383 | c = *domainname++; | |
384 | switch ((c)) { | |
385 | case '\\': /* "\\" */ | |
386 | continue; | |
387 | case '0': /* "\ooo" */ | |
388 | case '1': | |
389 | case '2': | |
390 | case '3': | |
391 | d = *domainname++; | |
392 | if (d < '0' || d > '7') | |
393 | break; | |
394 | e = *domainname++; | |
395 | if (e < '0' || e > '7') | |
396 | break; | |
397 | c = tomoyo_make_byte(c, d, e); | |
398 | if (tomoyo_is_invalid(c)) | |
399 | /* pattern is not \000 */ | |
400 | continue; | |
401 | } | |
402 | goto out; | |
403 | } else if (tomoyo_is_invalid(c)) { | |
404 | goto out; | |
405 | } | |
406 | } | |
407 | } while (*domainname); | |
408 | return true; | |
409 | out: | |
9590837b KT |
410 | return false; |
411 | } | |
412 | ||
413 | /** | |
414 | * tomoyo_is_domain_def - Check whether the given token can be a domainname. | |
415 | * | |
416 | * @buffer: The token to check. | |
417 | * | |
418 | * Returns true if @buffer possibly be a domainname, false otherwise. | |
419 | */ | |
420 | bool tomoyo_is_domain_def(const unsigned char *buffer) | |
421 | { | |
422 | return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN); | |
423 | } | |
424 | ||
425 | /** | |
426 | * tomoyo_find_domain - Find a domain by the given name. | |
427 | * | |
428 | * @domainname: The domainname to find. | |
429 | * | |
9590837b | 430 | * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise. |
fdb8ebb7 TH |
431 | * |
432 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
433 | */ |
434 | struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname) | |
435 | { | |
436 | struct tomoyo_domain_info *domain; | |
437 | struct tomoyo_path_info name; | |
438 | ||
439 | name.name = domainname; | |
440 | tomoyo_fill_path_info(&name); | |
fdb8ebb7 | 441 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
9590837b KT |
442 | if (!domain->is_deleted && |
443 | !tomoyo_pathcmp(&name, domain->domainname)) | |
444 | return domain; | |
445 | } | |
446 | return NULL; | |
447 | } | |
448 | ||
9590837b KT |
449 | /** |
450 | * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token. | |
451 | * | |
452 | * @filename: The string to evaluate. | |
453 | * | |
454 | * Returns the initial length without a pattern in @filename. | |
455 | */ | |
456 | static int tomoyo_const_part_length(const char *filename) | |
457 | { | |
458 | char c; | |
459 | int len = 0; | |
460 | ||
461 | if (!filename) | |
462 | return 0; | |
463 | while ((c = *filename++) != '\0') { | |
464 | if (c != '\\') { | |
465 | len++; | |
466 | continue; | |
467 | } | |
468 | c = *filename++; | |
469 | switch (c) { | |
470 | case '\\': /* "\\" */ | |
471 | len += 2; | |
472 | continue; | |
473 | case '0': /* "\ooo" */ | |
474 | case '1': | |
475 | case '2': | |
476 | case '3': | |
477 | c = *filename++; | |
478 | if (c < '0' || c > '7') | |
479 | break; | |
480 | c = *filename++; | |
481 | if (c < '0' || c > '7') | |
482 | break; | |
483 | len += 4; | |
484 | continue; | |
485 | } | |
486 | break; | |
487 | } | |
488 | return len; | |
489 | } | |
490 | ||
491 | /** | |
492 | * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members. | |
493 | * | |
494 | * @ptr: Pointer to "struct tomoyo_path_info" to fill in. | |
495 | * | |
496 | * The caller sets "struct tomoyo_path_info"->name. | |
497 | */ | |
498 | void tomoyo_fill_path_info(struct tomoyo_path_info *ptr) | |
499 | { | |
500 | const char *name = ptr->name; | |
501 | const int len = strlen(name); | |
502 | ||
9590837b KT |
503 | ptr->const_len = tomoyo_const_part_length(name); |
504 | ptr->is_dir = len && (name[len - 1] == '/'); | |
505 | ptr->is_patterned = (ptr->const_len < len); | |
506 | ptr->hash = full_name_hash(name, len); | |
9590837b KT |
507 | } |
508 | ||
509 | /** | |
7539cf4b | 510 | * tomoyo_file_matches_pattern2 - Pattern matching without '/' character |
9590837b KT |
511 | * and "\-" pattern. |
512 | * | |
513 | * @filename: The start of string to check. | |
514 | * @filename_end: The end of string to check. | |
515 | * @pattern: The start of pattern to compare. | |
516 | * @pattern_end: The end of pattern to compare. | |
517 | * | |
518 | * Returns true if @filename matches @pattern, false otherwise. | |
519 | */ | |
7539cf4b TH |
520 | static bool tomoyo_file_matches_pattern2(const char *filename, |
521 | const char *filename_end, | |
522 | const char *pattern, | |
523 | const char *pattern_end) | |
9590837b KT |
524 | { |
525 | while (filename < filename_end && pattern < pattern_end) { | |
526 | char c; | |
527 | if (*pattern != '\\') { | |
528 | if (*filename++ != *pattern++) | |
529 | return false; | |
530 | continue; | |
531 | } | |
532 | c = *filename; | |
533 | pattern++; | |
534 | switch (*pattern) { | |
535 | int i; | |
536 | int j; | |
537 | case '?': | |
538 | if (c == '/') { | |
539 | return false; | |
540 | } else if (c == '\\') { | |
541 | if (filename[1] == '\\') | |
542 | filename++; | |
543 | else if (tomoyo_is_byte_range(filename + 1)) | |
544 | filename += 3; | |
545 | else | |
546 | return false; | |
547 | } | |
548 | break; | |
549 | case '\\': | |
550 | if (c != '\\') | |
551 | return false; | |
552 | if (*++filename != '\\') | |
553 | return false; | |
554 | break; | |
555 | case '+': | |
556 | if (!isdigit(c)) | |
557 | return false; | |
558 | break; | |
559 | case 'x': | |
560 | if (!isxdigit(c)) | |
561 | return false; | |
562 | break; | |
563 | case 'a': | |
564 | if (!tomoyo_is_alphabet_char(c)) | |
565 | return false; | |
566 | break; | |
567 | case '0': | |
568 | case '1': | |
569 | case '2': | |
570 | case '3': | |
571 | if (c == '\\' && tomoyo_is_byte_range(filename + 1) | |
572 | && strncmp(filename + 1, pattern, 3) == 0) { | |
573 | filename += 3; | |
574 | pattern += 2; | |
575 | break; | |
576 | } | |
577 | return false; /* Not matched. */ | |
578 | case '*': | |
579 | case '@': | |
580 | for (i = 0; i <= filename_end - filename; i++) { | |
7539cf4b | 581 | if (tomoyo_file_matches_pattern2( |
9590837b KT |
582 | filename + i, filename_end, |
583 | pattern + 1, pattern_end)) | |
584 | return true; | |
585 | c = filename[i]; | |
586 | if (c == '.' && *pattern == '@') | |
587 | break; | |
588 | if (c != '\\') | |
589 | continue; | |
590 | if (filename[i + 1] == '\\') | |
591 | i++; | |
592 | else if (tomoyo_is_byte_range(filename + i + 1)) | |
593 | i += 3; | |
594 | else | |
595 | break; /* Bad pattern. */ | |
596 | } | |
597 | return false; /* Not matched. */ | |
598 | default: | |
599 | j = 0; | |
600 | c = *pattern; | |
601 | if (c == '$') { | |
602 | while (isdigit(filename[j])) | |
603 | j++; | |
604 | } else if (c == 'X') { | |
605 | while (isxdigit(filename[j])) | |
606 | j++; | |
607 | } else if (c == 'A') { | |
608 | while (tomoyo_is_alphabet_char(filename[j])) | |
609 | j++; | |
610 | } | |
611 | for (i = 1; i <= j; i++) { | |
7539cf4b | 612 | if (tomoyo_file_matches_pattern2( |
9590837b KT |
613 | filename + i, filename_end, |
614 | pattern + 1, pattern_end)) | |
615 | return true; | |
616 | } | |
617 | return false; /* Not matched or bad pattern. */ | |
618 | } | |
619 | filename++; | |
620 | pattern++; | |
621 | } | |
622 | while (*pattern == '\\' && | |
623 | (*(pattern + 1) == '*' || *(pattern + 1) == '@')) | |
624 | pattern += 2; | |
625 | return filename == filename_end && pattern == pattern_end; | |
626 | } | |
627 | ||
628 | /** | |
7539cf4b | 629 | * tomoyo_file_matches_pattern - Pattern matching without without '/' character. |
9590837b KT |
630 | * |
631 | * @filename: The start of string to check. | |
632 | * @filename_end: The end of string to check. | |
633 | * @pattern: The start of pattern to compare. | |
634 | * @pattern_end: The end of pattern to compare. | |
635 | * | |
636 | * Returns true if @filename matches @pattern, false otherwise. | |
637 | */ | |
7539cf4b | 638 | static bool tomoyo_file_matches_pattern(const char *filename, |
9590837b KT |
639 | const char *filename_end, |
640 | const char *pattern, | |
641 | const char *pattern_end) | |
642 | { | |
643 | const char *pattern_start = pattern; | |
644 | bool first = true; | |
645 | bool result; | |
646 | ||
647 | while (pattern < pattern_end - 1) { | |
648 | /* Split at "\-" pattern. */ | |
649 | if (*pattern++ != '\\' || *pattern++ != '-') | |
650 | continue; | |
7539cf4b TH |
651 | result = tomoyo_file_matches_pattern2(filename, |
652 | filename_end, | |
653 | pattern_start, | |
654 | pattern - 2); | |
9590837b KT |
655 | if (first) |
656 | result = !result; | |
657 | if (result) | |
658 | return false; | |
659 | first = false; | |
660 | pattern_start = pattern; | |
661 | } | |
7539cf4b TH |
662 | result = tomoyo_file_matches_pattern2(filename, filename_end, |
663 | pattern_start, pattern_end); | |
9590837b KT |
664 | return first ? result : !result; |
665 | } | |
666 | ||
7539cf4b TH |
667 | /** |
668 | * tomoyo_path_matches_pattern2 - Do pathname pattern matching. | |
669 | * | |
670 | * @f: The start of string to check. | |
671 | * @p: The start of pattern to compare. | |
672 | * | |
673 | * Returns true if @f matches @p, false otherwise. | |
674 | */ | |
675 | static bool tomoyo_path_matches_pattern2(const char *f, const char *p) | |
676 | { | |
677 | const char *f_delimiter; | |
678 | const char *p_delimiter; | |
679 | ||
680 | while (*f && *p) { | |
681 | f_delimiter = strchr(f, '/'); | |
682 | if (!f_delimiter) | |
683 | f_delimiter = f + strlen(f); | |
684 | p_delimiter = strchr(p, '/'); | |
685 | if (!p_delimiter) | |
686 | p_delimiter = p + strlen(p); | |
687 | if (*p == '\\' && *(p + 1) == '{') | |
688 | goto recursive; | |
689 | if (!tomoyo_file_matches_pattern(f, f_delimiter, p, | |
690 | p_delimiter)) | |
691 | return false; | |
692 | f = f_delimiter; | |
693 | if (*f) | |
694 | f++; | |
695 | p = p_delimiter; | |
696 | if (*p) | |
697 | p++; | |
698 | } | |
699 | /* Ignore trailing "\*" and "\@" in @pattern. */ | |
700 | while (*p == '\\' && | |
701 | (*(p + 1) == '*' || *(p + 1) == '@')) | |
702 | p += 2; | |
703 | return !*f && !*p; | |
704 | recursive: | |
705 | /* | |
706 | * The "\{" pattern is permitted only after '/' character. | |
707 | * This guarantees that below "*(p - 1)" is safe. | |
708 | * Also, the "\}" pattern is permitted only before '/' character | |
709 | * so that "\{" + "\}" pair will not break the "\-" operator. | |
710 | */ | |
711 | if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' || | |
712 | *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\') | |
713 | return false; /* Bad pattern. */ | |
714 | do { | |
715 | /* Compare current component with pattern. */ | |
716 | if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2, | |
717 | p_delimiter - 2)) | |
718 | break; | |
719 | /* Proceed to next component. */ | |
720 | f = f_delimiter; | |
721 | if (!*f) | |
722 | break; | |
723 | f++; | |
724 | /* Continue comparison. */ | |
725 | if (tomoyo_path_matches_pattern2(f, p_delimiter + 1)) | |
726 | return true; | |
727 | f_delimiter = strchr(f, '/'); | |
728 | } while (f_delimiter); | |
729 | return false; /* Not matched. */ | |
730 | } | |
731 | ||
9590837b KT |
732 | /** |
733 | * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern. | |
7539cf4b | 734 | * |
9590837b KT |
735 | * @filename: The filename to check. |
736 | * @pattern: The pattern to compare. | |
737 | * | |
738 | * Returns true if matches, false otherwise. | |
739 | * | |
740 | * The following patterns are available. | |
741 | * \\ \ itself. | |
742 | * \ooo Octal representation of a byte. | |
7539cf4b TH |
743 | * \* Zero or more repetitions of characters other than '/'. |
744 | * \@ Zero or more repetitions of characters other than '/' or '.'. | |
9590837b | 745 | * \? 1 byte character other than '/'. |
7539cf4b | 746 | * \$ One or more repetitions of decimal digits. |
9590837b | 747 | * \+ 1 decimal digit. |
7539cf4b | 748 | * \X One or more repetitions of hexadecimal digits. |
9590837b | 749 | * \x 1 hexadecimal digit. |
7539cf4b | 750 | * \A One or more repetitions of alphabet characters. |
9590837b | 751 | * \a 1 alphabet character. |
7539cf4b | 752 | * |
9590837b | 753 | * \- Subtraction operator. |
7539cf4b TH |
754 | * |
755 | * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/ | |
756 | * /dir/dir/dir/ ). | |
9590837b KT |
757 | */ |
758 | bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename, | |
759 | const struct tomoyo_path_info *pattern) | |
760 | { | |
9590837b KT |
761 | const char *f = filename->name; |
762 | const char *p = pattern->name; | |
763 | const int len = pattern->const_len; | |
764 | ||
765 | /* If @pattern doesn't contain pattern, I can use strcmp(). */ | |
766 | if (!pattern->is_patterned) | |
767 | return !tomoyo_pathcmp(filename, pattern); | |
7539cf4b TH |
768 | /* Don't compare directory and non-directory. */ |
769 | if (filename->is_dir != pattern->is_dir) | |
9590837b KT |
770 | return false; |
771 | /* Compare the initial length without patterns. */ | |
772 | if (strncmp(f, p, len)) | |
773 | return false; | |
774 | f += len; | |
775 | p += len; | |
7539cf4b | 776 | return tomoyo_path_matches_pattern2(f, p); |
9590837b KT |
777 | } |
778 | ||
779 | /** | |
780 | * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure. | |
781 | * | |
782 | * @head: Pointer to "struct tomoyo_io_buffer". | |
783 | * @fmt: The printf()'s format string, followed by parameters. | |
784 | * | |
785 | * Returns true if output was written, false otherwise. | |
786 | * | |
787 | * The snprintf() will truncate, but tomoyo_io_printf() won't. | |
788 | */ | |
789 | bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) | |
790 | { | |
791 | va_list args; | |
792 | int len; | |
793 | int pos = head->read_avail; | |
794 | int size = head->readbuf_size - pos; | |
795 | ||
796 | if (size <= 0) | |
797 | return false; | |
798 | va_start(args, fmt); | |
799 | len = vsnprintf(head->read_buf + pos, size, fmt, args); | |
800 | va_end(args); | |
801 | if (pos + len >= head->readbuf_size) | |
802 | return false; | |
803 | head->read_avail += len; | |
804 | return true; | |
805 | } | |
806 | ||
807 | /** | |
808 | * tomoyo_get_exe - Get tomoyo_realpath() of current process. | |
809 | * | |
810 | * Returns the tomoyo_realpath() of current process on success, NULL otherwise. | |
811 | * | |
8e2d39a1 | 812 | * This function uses kzalloc(), so the caller must call kfree() |
9590837b KT |
813 | * if this function didn't return NULL. |
814 | */ | |
815 | static const char *tomoyo_get_exe(void) | |
816 | { | |
817 | struct mm_struct *mm = current->mm; | |
818 | struct vm_area_struct *vma; | |
819 | const char *cp = NULL; | |
820 | ||
821 | if (!mm) | |
822 | return NULL; | |
823 | down_read(&mm->mmap_sem); | |
824 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
825 | if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) { | |
826 | cp = tomoyo_realpath_from_path(&vma->vm_file->f_path); | |
827 | break; | |
828 | } | |
829 | } | |
830 | up_read(&mm->mmap_sem); | |
831 | return cp; | |
832 | } | |
833 | ||
834 | /** | |
835 | * tomoyo_get_msg - Get warning message. | |
836 | * | |
837 | * @is_enforce: Is it enforcing mode? | |
838 | * | |
839 | * Returns "ERROR" or "WARNING". | |
840 | */ | |
841 | const char *tomoyo_get_msg(const bool is_enforce) | |
842 | { | |
843 | if (is_enforce) | |
844 | return "ERROR"; | |
845 | else | |
846 | return "WARNING"; | |
847 | } | |
848 | ||
849 | /** | |
850 | * tomoyo_check_flags - Check mode for specified functionality. | |
851 | * | |
852 | * @domain: Pointer to "struct tomoyo_domain_info". | |
853 | * @index: The functionality to check mode. | |
854 | * | |
855 | * TOMOYO checks only process context. | |
856 | * This code disables TOMOYO's enforcement in case the function is called from | |
857 | * interrupt context. | |
858 | */ | |
859 | unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain, | |
860 | const u8 index) | |
861 | { | |
862 | const u8 profile = domain->profile; | |
863 | ||
864 | if (WARN_ON(in_interrupt())) | |
865 | return 0; | |
866 | return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX | |
867 | #if TOMOYO_MAX_PROFILES != 256 | |
868 | && profile < TOMOYO_MAX_PROFILES | |
869 | #endif | |
870 | && tomoyo_profile_ptr[profile] ? | |
871 | tomoyo_profile_ptr[profile]->value[index] : 0; | |
872 | } | |
873 | ||
874 | /** | |
875 | * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode. | |
876 | * | |
877 | * @domain: Pointer to "struct tomoyo_domain_info". | |
878 | * | |
879 | * Returns true if domain policy violation warning should be printed to | |
880 | * console. | |
881 | */ | |
882 | bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain) | |
883 | { | |
884 | return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0; | |
885 | } | |
886 | ||
887 | /** | |
888 | * tomoyo_domain_quota_is_ok - Check for domain's quota. | |
889 | * | |
890 | * @domain: Pointer to "struct tomoyo_domain_info". | |
891 | * | |
892 | * Returns true if the domain is not exceeded quota, false otherwise. | |
fdb8ebb7 TH |
893 | * |
894 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
895 | */ |
896 | bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain) | |
897 | { | |
898 | unsigned int count = 0; | |
899 | struct tomoyo_acl_info *ptr; | |
900 | ||
901 | if (!domain) | |
902 | return true; | |
fdb8ebb7 | 903 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
ea13ddba | 904 | switch (ptr->type) { |
7ef61233 | 905 | struct tomoyo_path_acl *acl; |
937bf613 TH |
906 | u32 perm; |
907 | u8 i; | |
7ef61233 TH |
908 | case TOMOYO_TYPE_PATH_ACL: |
909 | acl = container_of(ptr, struct tomoyo_path_acl, head); | |
937bf613 | 910 | perm = acl->perm | (((u32) acl->perm_high) << 16); |
7ef61233 | 911 | for (i = 0; i < TOMOYO_MAX_PATH_OPERATION; i++) |
937bf613 TH |
912 | if (perm & (1 << i)) |
913 | count++; | |
7ef61233 | 914 | if (perm & (1 << TOMOYO_TYPE_READ_WRITE)) |
937bf613 | 915 | count -= 2; |
9590837b | 916 | break; |
7ef61233 TH |
917 | case TOMOYO_TYPE_PATH2_ACL: |
918 | perm = container_of(ptr, struct tomoyo_path2_acl, head) | |
919 | ->perm; | |
920 | for (i = 0; i < TOMOYO_MAX_PATH2_OPERATION; i++) | |
937bf613 TH |
921 | if (perm & (1 << i)) |
922 | count++; | |
9590837b KT |
923 | break; |
924 | } | |
925 | } | |
9590837b KT |
926 | if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY)) |
927 | return true; | |
928 | if (!domain->quota_warned) { | |
929 | domain->quota_warned = true; | |
930 | printk(KERN_WARNING "TOMOYO-WARNING: " | |
931 | "Domain '%s' has so many ACLs to hold. " | |
932 | "Stopped learning mode.\n", domain->domainname->name); | |
933 | } | |
934 | return false; | |
935 | } | |
936 | ||
937 | /** | |
938 | * tomoyo_find_or_assign_new_profile - Create a new profile. | |
939 | * | |
940 | * @profile: Profile number to create. | |
941 | * | |
942 | * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. | |
943 | */ | |
944 | static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned | |
945 | int profile) | |
946 | { | |
9590837b KT |
947 | struct tomoyo_profile *ptr = NULL; |
948 | int i; | |
949 | ||
950 | if (profile >= TOMOYO_MAX_PROFILES) | |
951 | return NULL; | |
29282381 TH |
952 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
953 | return NULL; | |
9590837b KT |
954 | ptr = tomoyo_profile_ptr[profile]; |
955 | if (ptr) | |
956 | goto ok; | |
4e5d6f7e | 957 | ptr = kmalloc(sizeof(*ptr), GFP_NOFS); |
cd7bec6a TH |
958 | if (!tomoyo_memory_ok(ptr)) { |
959 | kfree(ptr); | |
181427a7 | 960 | ptr = NULL; |
9590837b | 961 | goto ok; |
cd7bec6a | 962 | } |
9590837b KT |
963 | for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) |
964 | ptr->value[i] = tomoyo_control_array[i].current_value; | |
965 | mb(); /* Avoid out-of-order execution. */ | |
966 | tomoyo_profile_ptr[profile] = ptr; | |
967 | ok: | |
29282381 | 968 | mutex_unlock(&tomoyo_policy_lock); |
9590837b KT |
969 | return ptr; |
970 | } | |
971 | ||
972 | /** | |
973 | * tomoyo_write_profile - Write to profile table. | |
974 | * | |
975 | * @head: Pointer to "struct tomoyo_io_buffer". | |
976 | * | |
977 | * Returns 0 on success, negative value otherwise. | |
978 | */ | |
979 | static int tomoyo_write_profile(struct tomoyo_io_buffer *head) | |
980 | { | |
981 | char *data = head->write_buf; | |
982 | unsigned int i; | |
983 | unsigned int value; | |
984 | char *cp; | |
985 | struct tomoyo_profile *profile; | |
986 | unsigned long num; | |
987 | ||
988 | cp = strchr(data, '-'); | |
989 | if (cp) | |
990 | *cp = '\0'; | |
991 | if (strict_strtoul(data, 10, &num)) | |
992 | return -EINVAL; | |
993 | if (cp) | |
994 | data = cp + 1; | |
995 | profile = tomoyo_find_or_assign_new_profile(num); | |
996 | if (!profile) | |
997 | return -EINVAL; | |
998 | cp = strchr(data, '='); | |
999 | if (!cp) | |
1000 | return -EINVAL; | |
1001 | *cp = '\0'; | |
1002 | if (!strcmp(data, "COMMENT")) { | |
bf24fb01 TH |
1003 | const struct tomoyo_path_info *old_comment = profile->comment; |
1004 | profile->comment = tomoyo_get_name(cp + 1); | |
1005 | tomoyo_put_name(old_comment); | |
9590837b KT |
1006 | return 0; |
1007 | } | |
1008 | for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) { | |
1009 | if (strcmp(data, tomoyo_control_array[i].keyword)) | |
1010 | continue; | |
1011 | if (sscanf(cp + 1, "%u", &value) != 1) { | |
1012 | int j; | |
1013 | const char **modes; | |
1014 | switch (i) { | |
1015 | case TOMOYO_VERBOSE: | |
1016 | modes = tomoyo_mode_2; | |
1017 | break; | |
1018 | default: | |
1019 | modes = tomoyo_mode_4; | |
1020 | break; | |
1021 | } | |
1022 | for (j = 0; j < 4; j++) { | |
1023 | if (strcmp(cp + 1, modes[j])) | |
1024 | continue; | |
1025 | value = j; | |
1026 | break; | |
1027 | } | |
1028 | if (j == 4) | |
1029 | return -EINVAL; | |
1030 | } else if (value > tomoyo_control_array[i].max_value) { | |
1031 | value = tomoyo_control_array[i].max_value; | |
1032 | } | |
1033 | profile->value[i] = value; | |
1034 | return 0; | |
1035 | } | |
1036 | return -EINVAL; | |
1037 | } | |
1038 | ||
1039 | /** | |
1040 | * tomoyo_read_profile - Read from profile table. | |
1041 | * | |
1042 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1043 | * | |
1044 | * Returns 0. | |
1045 | */ | |
1046 | static int tomoyo_read_profile(struct tomoyo_io_buffer *head) | |
1047 | { | |
1048 | static const int total = TOMOYO_MAX_CONTROL_INDEX + 1; | |
1049 | int step; | |
1050 | ||
1051 | if (head->read_eof) | |
1052 | return 0; | |
1053 | for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total; | |
1054 | step++) { | |
1055 | const u8 index = step / total; | |
1056 | u8 type = step % total; | |
1057 | const struct tomoyo_profile *profile | |
1058 | = tomoyo_profile_ptr[index]; | |
1059 | head->read_step = step; | |
1060 | if (!profile) | |
1061 | continue; | |
1062 | if (!type) { /* Print profile' comment tag. */ | |
1063 | if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n", | |
1064 | index, profile->comment ? | |
1065 | profile->comment->name : "")) | |
1066 | break; | |
1067 | continue; | |
1068 | } | |
1069 | type--; | |
1070 | if (type < TOMOYO_MAX_CONTROL_INDEX) { | |
1071 | const unsigned int value = profile->value[type]; | |
1072 | const char **modes = NULL; | |
1073 | const char *keyword | |
1074 | = tomoyo_control_array[type].keyword; | |
1075 | switch (tomoyo_control_array[type].max_value) { | |
1076 | case 3: | |
1077 | modes = tomoyo_mode_4; | |
1078 | break; | |
1079 | case 1: | |
1080 | modes = tomoyo_mode_2; | |
1081 | break; | |
1082 | } | |
1083 | if (modes) { | |
1084 | if (!tomoyo_io_printf(head, "%u-%s=%s\n", index, | |
1085 | keyword, modes[value])) | |
1086 | break; | |
1087 | } else { | |
1088 | if (!tomoyo_io_printf(head, "%u-%s=%u\n", index, | |
1089 | keyword, value)) | |
1090 | break; | |
1091 | } | |
1092 | } | |
1093 | } | |
1094 | if (step == TOMOYO_MAX_PROFILES * total) | |
1095 | head->read_eof = true; | |
1096 | return 0; | |
1097 | } | |
1098 | ||
c3fa109a TH |
1099 | /* |
1100 | * tomoyo_policy_manager_list is used for holding list of domainnames or | |
1101 | * programs which are permitted to modify configuration via | |
1102 | * /sys/kernel/security/tomoyo/ interface. | |
1103 | * | |
1104 | * An entry is added by | |
1105 | * | |
1106 | * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \ | |
1107 | * /sys/kernel/security/tomoyo/manager | |
1108 | * (if you want to specify by a domainname) | |
1109 | * | |
1110 | * or | |
1111 | * | |
1112 | * # echo '/usr/lib/ccs/editpolicy' > /sys/kernel/security/tomoyo/manager | |
1113 | * (if you want to specify by a program's location) | |
1114 | * | |
1115 | * and is deleted by | |
1116 | * | |
1117 | * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \ | |
1118 | * /sys/kernel/security/tomoyo/manager | |
1119 | * | |
1120 | * or | |
1121 | * | |
1122 | * # echo 'delete /usr/lib/ccs/editpolicy' > \ | |
1123 | * /sys/kernel/security/tomoyo/manager | |
1124 | * | |
1125 | * and all entries are retrieved by | |
1126 | * | |
1127 | * # cat /sys/kernel/security/tomoyo/manager | |
1128 | */ | |
847b173e | 1129 | LIST_HEAD(tomoyo_policy_manager_list); |
9590837b KT |
1130 | |
1131 | /** | |
1132 | * tomoyo_update_manager_entry - Add a manager entry. | |
1133 | * | |
1134 | * @manager: The path to manager or the domainnamme. | |
1135 | * @is_delete: True if it is a delete request. | |
1136 | * | |
1137 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1138 | * |
1139 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1140 | */ |
1141 | static int tomoyo_update_manager_entry(const char *manager, | |
1142 | const bool is_delete) | |
1143 | { | |
9590837b | 1144 | struct tomoyo_policy_manager_entry *ptr; |
9e4b50e9 | 1145 | struct tomoyo_policy_manager_entry e = { }; |
ca0b7df3 | 1146 | int error = is_delete ? -ENOENT : -ENOMEM; |
9590837b KT |
1147 | |
1148 | if (tomoyo_is_domain_def(manager)) { | |
17080008 | 1149 | if (!tomoyo_is_correct_domain(manager)) |
9590837b | 1150 | return -EINVAL; |
9e4b50e9 | 1151 | e.is_domain = true; |
9590837b | 1152 | } else { |
17080008 | 1153 | if (!tomoyo_is_correct_path(manager, 1, -1, -1)) |
9590837b KT |
1154 | return -EINVAL; |
1155 | } | |
9e4b50e9 TH |
1156 | e.manager = tomoyo_get_name(manager); |
1157 | if (!e.manager) | |
9590837b | 1158 | return -ENOMEM; |
29282381 TH |
1159 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
1160 | goto out; | |
fdb8ebb7 | 1161 | list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { |
9e4b50e9 | 1162 | if (ptr->manager != e.manager) |
9590837b KT |
1163 | continue; |
1164 | ptr->is_deleted = is_delete; | |
1165 | error = 0; | |
ca0b7df3 | 1166 | break; |
9590837b | 1167 | } |
9e4b50e9 TH |
1168 | if (!is_delete && error) { |
1169 | struct tomoyo_policy_manager_entry *entry = | |
1170 | tomoyo_commit_ok(&e, sizeof(e)); | |
1171 | if (entry) { | |
1172 | list_add_tail_rcu(&entry->list, | |
1173 | &tomoyo_policy_manager_list); | |
1174 | error = 0; | |
1175 | } | |
9590837b | 1176 | } |
f737d95d | 1177 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 1178 | out: |
9e4b50e9 | 1179 | tomoyo_put_name(e.manager); |
9590837b KT |
1180 | return error; |
1181 | } | |
1182 | ||
1183 | /** | |
1184 | * tomoyo_write_manager_policy - Write manager policy. | |
1185 | * | |
1186 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1187 | * | |
1188 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1189 | * |
1190 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1191 | */ |
1192 | static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head) | |
1193 | { | |
1194 | char *data = head->write_buf; | |
1195 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
1196 | ||
1197 | if (!strcmp(data, "manage_by_non_root")) { | |
1198 | tomoyo_manage_by_non_root = !is_delete; | |
1199 | return 0; | |
1200 | } | |
1201 | return tomoyo_update_manager_entry(data, is_delete); | |
1202 | } | |
1203 | ||
1204 | /** | |
1205 | * tomoyo_read_manager_policy - Read manager policy. | |
1206 | * | |
1207 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1208 | * | |
1209 | * Returns 0. | |
fdb8ebb7 TH |
1210 | * |
1211 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1212 | */ |
1213 | static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head) | |
1214 | { | |
1215 | struct list_head *pos; | |
1216 | bool done = true; | |
1217 | ||
1218 | if (head->read_eof) | |
1219 | return 0; | |
9590837b KT |
1220 | list_for_each_cookie(pos, head->read_var2, |
1221 | &tomoyo_policy_manager_list) { | |
1222 | struct tomoyo_policy_manager_entry *ptr; | |
1223 | ptr = list_entry(pos, struct tomoyo_policy_manager_entry, | |
1224 | list); | |
1225 | if (ptr->is_deleted) | |
1226 | continue; | |
7d2948b1 TH |
1227 | done = tomoyo_io_printf(head, "%s\n", ptr->manager->name); |
1228 | if (!done) | |
9590837b | 1229 | break; |
9590837b | 1230 | } |
9590837b KT |
1231 | head->read_eof = done; |
1232 | return 0; | |
1233 | } | |
1234 | ||
1235 | /** | |
1236 | * tomoyo_is_policy_manager - Check whether the current process is a policy manager. | |
1237 | * | |
1238 | * Returns true if the current process is permitted to modify policy | |
1239 | * via /sys/kernel/security/tomoyo/ interface. | |
fdb8ebb7 TH |
1240 | * |
1241 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1242 | */ |
1243 | static bool tomoyo_is_policy_manager(void) | |
1244 | { | |
1245 | struct tomoyo_policy_manager_entry *ptr; | |
1246 | const char *exe; | |
1247 | const struct task_struct *task = current; | |
1248 | const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; | |
1249 | bool found = false; | |
1250 | ||
1251 | if (!tomoyo_policy_loaded) | |
1252 | return true; | |
1253 | if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) | |
1254 | return false; | |
fdb8ebb7 | 1255 | list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { |
9590837b KT |
1256 | if (!ptr->is_deleted && ptr->is_domain |
1257 | && !tomoyo_pathcmp(domainname, ptr->manager)) { | |
1258 | found = true; | |
1259 | break; | |
1260 | } | |
1261 | } | |
9590837b KT |
1262 | if (found) |
1263 | return true; | |
1264 | exe = tomoyo_get_exe(); | |
1265 | if (!exe) | |
1266 | return false; | |
fdb8ebb7 | 1267 | list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { |
9590837b KT |
1268 | if (!ptr->is_deleted && !ptr->is_domain |
1269 | && !strcmp(exe, ptr->manager->name)) { | |
1270 | found = true; | |
1271 | break; | |
1272 | } | |
1273 | } | |
9590837b KT |
1274 | if (!found) { /* Reduce error messages. */ |
1275 | static pid_t last_pid; | |
1276 | const pid_t pid = current->pid; | |
1277 | if (last_pid != pid) { | |
1278 | printk(KERN_WARNING "%s ( %s ) is not permitted to " | |
1279 | "update policies.\n", domainname->name, exe); | |
1280 | last_pid = pid; | |
1281 | } | |
1282 | } | |
8e2d39a1 | 1283 | kfree(exe); |
9590837b KT |
1284 | return found; |
1285 | } | |
1286 | ||
1287 | /** | |
1288 | * tomoyo_is_select_one - Parse select command. | |
1289 | * | |
1290 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1291 | * @data: String to parse. | |
1292 | * | |
1293 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
1294 | * |
1295 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1296 | */ |
1297 | static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head, | |
1298 | const char *data) | |
1299 | { | |
1300 | unsigned int pid; | |
1301 | struct tomoyo_domain_info *domain = NULL; | |
1302 | ||
1303 | if (sscanf(data, "pid=%u", &pid) == 1) { | |
1304 | struct task_struct *p; | |
1fcdc7c5 | 1305 | rcu_read_lock(); |
9590837b KT |
1306 | read_lock(&tasklist_lock); |
1307 | p = find_task_by_vpid(pid); | |
1308 | if (p) | |
1309 | domain = tomoyo_real_domain(p); | |
1310 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 1311 | rcu_read_unlock(); |
9590837b | 1312 | } else if (!strncmp(data, "domain=", 7)) { |
fdb8ebb7 | 1313 | if (tomoyo_is_domain_def(data + 7)) |
9590837b | 1314 | domain = tomoyo_find_domain(data + 7); |
9590837b KT |
1315 | } else |
1316 | return false; | |
1317 | head->write_var1 = domain; | |
1318 | /* Accessing read_buf is safe because head->io_sem is held. */ | |
1319 | if (!head->read_buf) | |
1320 | return true; /* Do nothing if open(O_WRONLY). */ | |
1321 | head->read_avail = 0; | |
1322 | tomoyo_io_printf(head, "# select %s\n", data); | |
1323 | head->read_single_domain = true; | |
1324 | head->read_eof = !domain; | |
1325 | if (domain) { | |
1326 | struct tomoyo_domain_info *d; | |
1327 | head->read_var1 = NULL; | |
fdb8ebb7 | 1328 | list_for_each_entry_rcu(d, &tomoyo_domain_list, list) { |
9590837b KT |
1329 | if (d == domain) |
1330 | break; | |
1331 | head->read_var1 = &d->list; | |
1332 | } | |
9590837b KT |
1333 | head->read_var2 = NULL; |
1334 | head->read_bit = 0; | |
1335 | head->read_step = 0; | |
1336 | if (domain->is_deleted) | |
1337 | tomoyo_io_printf(head, "# This is a deleted domain.\n"); | |
1338 | } | |
1339 | return true; | |
1340 | } | |
1341 | ||
ccf135f5 TH |
1342 | /** |
1343 | * tomoyo_delete_domain - Delete a domain. | |
1344 | * | |
1345 | * @domainname: The name of domain. | |
1346 | * | |
1347 | * Returns 0. | |
fdb8ebb7 TH |
1348 | * |
1349 | * Caller holds tomoyo_read_lock(). | |
ccf135f5 TH |
1350 | */ |
1351 | static int tomoyo_delete_domain(char *domainname) | |
1352 | { | |
1353 | struct tomoyo_domain_info *domain; | |
1354 | struct tomoyo_path_info name; | |
1355 | ||
1356 | name.name = domainname; | |
1357 | tomoyo_fill_path_info(&name); | |
29282381 TH |
1358 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
1359 | return 0; | |
ccf135f5 | 1360 | /* Is there an active domain? */ |
fdb8ebb7 | 1361 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
ccf135f5 TH |
1362 | /* Never delete tomoyo_kernel_domain */ |
1363 | if (domain == &tomoyo_kernel_domain) | |
1364 | continue; | |
1365 | if (domain->is_deleted || | |
1366 | tomoyo_pathcmp(domain->domainname, &name)) | |
1367 | continue; | |
1368 | domain->is_deleted = true; | |
1369 | break; | |
1370 | } | |
f737d95d | 1371 | mutex_unlock(&tomoyo_policy_lock); |
ccf135f5 TH |
1372 | return 0; |
1373 | } | |
1374 | ||
9590837b KT |
1375 | /** |
1376 | * tomoyo_write_domain_policy - Write domain policy. | |
1377 | * | |
1378 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1379 | * | |
1380 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1381 | * |
1382 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1383 | */ |
1384 | static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) | |
1385 | { | |
1386 | char *data = head->write_buf; | |
1387 | struct tomoyo_domain_info *domain = head->write_var1; | |
1388 | bool is_delete = false; | |
1389 | bool is_select = false; | |
9590837b KT |
1390 | unsigned int profile; |
1391 | ||
1392 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) | |
1393 | is_delete = true; | |
1394 | else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) | |
1395 | is_select = true; | |
9590837b KT |
1396 | if (is_select && tomoyo_is_select_one(head, data)) |
1397 | return 0; | |
1398 | /* Don't allow updating policies by non manager programs. */ | |
1399 | if (!tomoyo_is_policy_manager()) | |
1400 | return -EPERM; | |
1401 | if (tomoyo_is_domain_def(data)) { | |
1402 | domain = NULL; | |
1403 | if (is_delete) | |
1404 | tomoyo_delete_domain(data); | |
fdb8ebb7 | 1405 | else if (is_select) |
9590837b | 1406 | domain = tomoyo_find_domain(data); |
fdb8ebb7 | 1407 | else |
9590837b KT |
1408 | domain = tomoyo_find_or_assign_new_domain(data, 0); |
1409 | head->write_var1 = domain; | |
1410 | return 0; | |
1411 | } | |
1412 | if (!domain) | |
1413 | return -EINVAL; | |
1414 | ||
1415 | if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 | |
1416 | && profile < TOMOYO_MAX_PROFILES) { | |
1417 | if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) | |
1418 | domain->profile = (u8) profile; | |
1419 | return 0; | |
1420 | } | |
1421 | if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { | |
ea13ddba | 1422 | domain->ignore_global_allow_read = !is_delete; |
9590837b KT |
1423 | return 0; |
1424 | } | |
1425 | return tomoyo_write_file_policy(data, domain, is_delete); | |
1426 | } | |
1427 | ||
1428 | /** | |
7ef61233 | 1429 | * tomoyo_print_path_acl - Print a single path ACL entry. |
9590837b KT |
1430 | * |
1431 | * @head: Pointer to "struct tomoyo_io_buffer". | |
7ef61233 | 1432 | * @ptr: Pointer to "struct tomoyo_path_acl". |
9590837b KT |
1433 | * |
1434 | * Returns true on success, false otherwise. | |
1435 | */ | |
7ef61233 TH |
1436 | static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head, |
1437 | struct tomoyo_path_acl *ptr) | |
9590837b KT |
1438 | { |
1439 | int pos; | |
1440 | u8 bit; | |
937bf613 | 1441 | const u32 perm = ptr->perm | (((u32) ptr->perm_high) << 16); |
9590837b | 1442 | |
7ef61233 | 1443 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { |
9590837b KT |
1444 | if (!(perm & (1 << bit))) |
1445 | continue; | |
1446 | /* Print "read/write" instead of "read" and "write". */ | |
7ef61233 TH |
1447 | if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE) |
1448 | && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
9590837b | 1449 | continue; |
9590837b | 1450 | pos = head->read_avail; |
7762fbff TH |
1451 | if (!tomoyo_io_printf(head, "allow_%s ", |
1452 | tomoyo_path2keyword(bit)) || | |
1453 | !tomoyo_print_name_union(head, &ptr->name) || | |
1454 | !tomoyo_io_printf(head, "\n")) | |
9590837b KT |
1455 | goto out; |
1456 | } | |
1457 | head->read_bit = 0; | |
1458 | return true; | |
1459 | out: | |
1460 | head->read_bit = bit; | |
1461 | head->read_avail = pos; | |
1462 | return false; | |
1463 | } | |
1464 | ||
1465 | /** | |
7ef61233 | 1466 | * tomoyo_print_path2_acl - Print a double path ACL entry. |
9590837b KT |
1467 | * |
1468 | * @head: Pointer to "struct tomoyo_io_buffer". | |
7ef61233 | 1469 | * @ptr: Pointer to "struct tomoyo_path2_acl". |
9590837b KT |
1470 | * |
1471 | * Returns true on success, false otherwise. | |
1472 | */ | |
7ef61233 TH |
1473 | static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head, |
1474 | struct tomoyo_path2_acl *ptr) | |
9590837b KT |
1475 | { |
1476 | int pos; | |
9590837b KT |
1477 | const u8 perm = ptr->perm; |
1478 | u8 bit; | |
1479 | ||
7ef61233 | 1480 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { |
9590837b KT |
1481 | if (!(perm & (1 << bit))) |
1482 | continue; | |
9590837b | 1483 | pos = head->read_avail; |
7762fbff TH |
1484 | if (!tomoyo_io_printf(head, "allow_%s ", |
1485 | tomoyo_path22keyword(bit)) || | |
1486 | !tomoyo_print_name_union(head, &ptr->name1) || | |
1487 | !tomoyo_print_name_union(head, &ptr->name2) || | |
1488 | !tomoyo_io_printf(head, "\n")) | |
9590837b KT |
1489 | goto out; |
1490 | } | |
1491 | head->read_bit = 0; | |
1492 | return true; | |
1493 | out: | |
1494 | head->read_bit = bit; | |
1495 | head->read_avail = pos; | |
1496 | return false; | |
1497 | } | |
1498 | ||
1499 | /** | |
1500 | * tomoyo_print_entry - Print an ACL entry. | |
1501 | * | |
1502 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1503 | * @ptr: Pointer to an ACL entry. | |
1504 | * | |
1505 | * Returns true on success, false otherwise. | |
1506 | */ | |
1507 | static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, | |
1508 | struct tomoyo_acl_info *ptr) | |
1509 | { | |
ea13ddba | 1510 | const u8 acl_type = ptr->type; |
9590837b | 1511 | |
7ef61233 TH |
1512 | if (acl_type == TOMOYO_TYPE_PATH_ACL) { |
1513 | struct tomoyo_path_acl *acl | |
1514 | = container_of(ptr, struct tomoyo_path_acl, head); | |
1515 | return tomoyo_print_path_acl(head, acl); | |
9590837b | 1516 | } |
7ef61233 TH |
1517 | if (acl_type == TOMOYO_TYPE_PATH2_ACL) { |
1518 | struct tomoyo_path2_acl *acl | |
1519 | = container_of(ptr, struct tomoyo_path2_acl, head); | |
1520 | return tomoyo_print_path2_acl(head, acl); | |
9590837b KT |
1521 | } |
1522 | BUG(); /* This must not happen. */ | |
1523 | return false; | |
1524 | } | |
1525 | ||
1526 | /** | |
1527 | * tomoyo_read_domain_policy - Read domain policy. | |
1528 | * | |
1529 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1530 | * | |
1531 | * Returns 0. | |
fdb8ebb7 TH |
1532 | * |
1533 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1534 | */ |
1535 | static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) | |
1536 | { | |
1537 | struct list_head *dpos; | |
1538 | struct list_head *apos; | |
1539 | bool done = true; | |
1540 | ||
1541 | if (head->read_eof) | |
1542 | return 0; | |
1543 | if (head->read_step == 0) | |
1544 | head->read_step = 1; | |
9590837b KT |
1545 | list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) { |
1546 | struct tomoyo_domain_info *domain; | |
1547 | const char *quota_exceeded = ""; | |
1548 | const char *transition_failed = ""; | |
1549 | const char *ignore_global_allow_read = ""; | |
1550 | domain = list_entry(dpos, struct tomoyo_domain_info, list); | |
1551 | if (head->read_step != 1) | |
1552 | goto acl_loop; | |
1553 | if (domain->is_deleted && !head->read_single_domain) | |
1554 | continue; | |
1555 | /* Print domainname and flags. */ | |
1556 | if (domain->quota_warned) | |
1557 | quota_exceeded = "quota_exceeded\n"; | |
ea13ddba | 1558 | if (domain->transition_failed) |
9590837b | 1559 | transition_failed = "transition_failed\n"; |
ea13ddba | 1560 | if (domain->ignore_global_allow_read) |
9590837b KT |
1561 | ignore_global_allow_read |
1562 | = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; | |
7d2948b1 TH |
1563 | done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE |
1564 | "%u\n%s%s%s\n", | |
1565 | domain->domainname->name, | |
1566 | domain->profile, quota_exceeded, | |
1567 | transition_failed, | |
1568 | ignore_global_allow_read); | |
1569 | if (!done) | |
9590837b | 1570 | break; |
9590837b KT |
1571 | head->read_step = 2; |
1572 | acl_loop: | |
1573 | if (head->read_step == 3) | |
1574 | goto tail_mark; | |
1575 | /* Print ACL entries in the domain. */ | |
9590837b | 1576 | list_for_each_cookie(apos, head->read_var2, |
7d2948b1 | 1577 | &domain->acl_info_list) { |
9590837b KT |
1578 | struct tomoyo_acl_info *ptr |
1579 | = list_entry(apos, struct tomoyo_acl_info, | |
7d2948b1 TH |
1580 | list); |
1581 | done = tomoyo_print_entry(head, ptr); | |
1582 | if (!done) | |
9590837b | 1583 | break; |
9590837b | 1584 | } |
9590837b KT |
1585 | if (!done) |
1586 | break; | |
1587 | head->read_step = 3; | |
1588 | tail_mark: | |
7d2948b1 TH |
1589 | done = tomoyo_io_printf(head, "\n"); |
1590 | if (!done) | |
9590837b | 1591 | break; |
9590837b KT |
1592 | head->read_step = 1; |
1593 | if (head->read_single_domain) | |
1594 | break; | |
1595 | } | |
9590837b KT |
1596 | head->read_eof = done; |
1597 | return 0; | |
1598 | } | |
1599 | ||
1600 | /** | |
1601 | * tomoyo_write_domain_profile - Assign profile for specified domain. | |
1602 | * | |
1603 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1604 | * | |
1605 | * Returns 0 on success, -EINVAL otherwise. | |
1606 | * | |
1607 | * This is equivalent to doing | |
1608 | * | |
1609 | * ( echo "select " $domainname; echo "use_profile " $profile ) | | |
1610 | * /usr/lib/ccs/loadpolicy -d | |
fdb8ebb7 TH |
1611 | * |
1612 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1613 | */ |
1614 | static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) | |
1615 | { | |
1616 | char *data = head->write_buf; | |
1617 | char *cp = strchr(data, ' '); | |
1618 | struct tomoyo_domain_info *domain; | |
1619 | unsigned long profile; | |
1620 | ||
1621 | if (!cp) | |
1622 | return -EINVAL; | |
1623 | *cp = '\0'; | |
9590837b | 1624 | domain = tomoyo_find_domain(cp + 1); |
9590837b KT |
1625 | if (strict_strtoul(data, 10, &profile)) |
1626 | return -EINVAL; | |
1627 | if (domain && profile < TOMOYO_MAX_PROFILES | |
1628 | && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) | |
1629 | domain->profile = (u8) profile; | |
1630 | return 0; | |
1631 | } | |
1632 | ||
1633 | /** | |
1634 | * tomoyo_read_domain_profile - Read only domainname and profile. | |
1635 | * | |
1636 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1637 | * | |
1638 | * Returns list of profile number and domainname pairs. | |
1639 | * | |
1640 | * This is equivalent to doing | |
1641 | * | |
1642 | * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | | |
1643 | * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) | |
1644 | * domainname = $0; } else if ( $1 == "use_profile" ) { | |
1645 | * print $2 " " domainname; domainname = ""; } } ; ' | |
fdb8ebb7 TH |
1646 | * |
1647 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1648 | */ |
1649 | static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) | |
1650 | { | |
1651 | struct list_head *pos; | |
1652 | bool done = true; | |
1653 | ||
1654 | if (head->read_eof) | |
1655 | return 0; | |
9590837b KT |
1656 | list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) { |
1657 | struct tomoyo_domain_info *domain; | |
1658 | domain = list_entry(pos, struct tomoyo_domain_info, list); | |
1659 | if (domain->is_deleted) | |
1660 | continue; | |
7d2948b1 TH |
1661 | done = tomoyo_io_printf(head, "%u %s\n", domain->profile, |
1662 | domain->domainname->name); | |
1663 | if (!done) | |
9590837b | 1664 | break; |
9590837b | 1665 | } |
9590837b KT |
1666 | head->read_eof = done; |
1667 | return 0; | |
1668 | } | |
1669 | ||
1670 | /** | |
1671 | * tomoyo_write_pid: Specify PID to obtain domainname. | |
1672 | * | |
1673 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1674 | * | |
1675 | * Returns 0. | |
1676 | */ | |
1677 | static int tomoyo_write_pid(struct tomoyo_io_buffer *head) | |
1678 | { | |
1679 | unsigned long pid; | |
1680 | /* No error check. */ | |
1681 | strict_strtoul(head->write_buf, 10, &pid); | |
1682 | head->read_step = (int) pid; | |
1683 | head->read_eof = false; | |
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | /** | |
1688 | * tomoyo_read_pid - Get domainname of the specified PID. | |
1689 | * | |
1690 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1691 | * | |
1692 | * Returns the domainname which the specified PID is in on success, | |
1693 | * empty string otherwise. | |
1694 | * The PID is specified by tomoyo_write_pid() so that the user can obtain | |
1695 | * using read()/write() interface rather than sysctl() interface. | |
1696 | */ | |
1697 | static int tomoyo_read_pid(struct tomoyo_io_buffer *head) | |
1698 | { | |
1699 | if (head->read_avail == 0 && !head->read_eof) { | |
1700 | const int pid = head->read_step; | |
1701 | struct task_struct *p; | |
1702 | struct tomoyo_domain_info *domain = NULL; | |
1fcdc7c5 | 1703 | rcu_read_lock(); |
9590837b KT |
1704 | read_lock(&tasklist_lock); |
1705 | p = find_task_by_vpid(pid); | |
1706 | if (p) | |
1707 | domain = tomoyo_real_domain(p); | |
1708 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 1709 | rcu_read_unlock(); |
9590837b KT |
1710 | if (domain) |
1711 | tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, | |
1712 | domain->domainname->name); | |
1713 | head->read_eof = true; | |
1714 | } | |
1715 | return 0; | |
1716 | } | |
1717 | ||
1718 | /** | |
1719 | * tomoyo_write_exception_policy - Write exception policy. | |
1720 | * | |
1721 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1722 | * | |
1723 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1724 | * |
1725 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1726 | */ |
1727 | static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) | |
1728 | { | |
1729 | char *data = head->write_buf; | |
1730 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
1731 | ||
1732 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN)) | |
1733 | return tomoyo_write_domain_keeper_policy(data, false, | |
1734 | is_delete); | |
1735 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN)) | |
1736 | return tomoyo_write_domain_keeper_policy(data, true, is_delete); | |
1737 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN)) | |
1738 | return tomoyo_write_domain_initializer_policy(data, false, | |
1739 | is_delete); | |
1740 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN)) | |
1741 | return tomoyo_write_domain_initializer_policy(data, true, | |
1742 | is_delete); | |
1743 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS)) | |
1744 | return tomoyo_write_alias_policy(data, is_delete); | |
1745 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) | |
1746 | return tomoyo_write_globally_readable_policy(data, is_delete); | |
1747 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) | |
1748 | return tomoyo_write_pattern_policy(data, is_delete); | |
1749 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) | |
1750 | return tomoyo_write_no_rewrite_policy(data, is_delete); | |
7762fbff TH |
1751 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP)) |
1752 | return tomoyo_write_path_group_policy(data, is_delete); | |
9590837b KT |
1753 | return -EINVAL; |
1754 | } | |
1755 | ||
1756 | /** | |
1757 | * tomoyo_read_exception_policy - Read exception policy. | |
1758 | * | |
1759 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1760 | * | |
1761 | * Returns 0 on success, -EINVAL otherwise. | |
fdb8ebb7 TH |
1762 | * |
1763 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1764 | */ |
1765 | static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) | |
1766 | { | |
1767 | if (!head->read_eof) { | |
1768 | switch (head->read_step) { | |
1769 | case 0: | |
1770 | head->read_var2 = NULL; | |
1771 | head->read_step = 1; | |
1772 | case 1: | |
1773 | if (!tomoyo_read_domain_keeper_policy(head)) | |
1774 | break; | |
1775 | head->read_var2 = NULL; | |
1776 | head->read_step = 2; | |
1777 | case 2: | |
1778 | if (!tomoyo_read_globally_readable_policy(head)) | |
1779 | break; | |
1780 | head->read_var2 = NULL; | |
1781 | head->read_step = 3; | |
1782 | case 3: | |
1783 | head->read_var2 = NULL; | |
1784 | head->read_step = 4; | |
1785 | case 4: | |
1786 | if (!tomoyo_read_domain_initializer_policy(head)) | |
1787 | break; | |
1788 | head->read_var2 = NULL; | |
1789 | head->read_step = 5; | |
1790 | case 5: | |
1791 | if (!tomoyo_read_alias_policy(head)) | |
1792 | break; | |
1793 | head->read_var2 = NULL; | |
1794 | head->read_step = 6; | |
1795 | case 6: | |
1796 | head->read_var2 = NULL; | |
1797 | head->read_step = 7; | |
1798 | case 7: | |
1799 | if (!tomoyo_read_file_pattern(head)) | |
1800 | break; | |
1801 | head->read_var2 = NULL; | |
1802 | head->read_step = 8; | |
1803 | case 8: | |
1804 | if (!tomoyo_read_no_rewrite_policy(head)) | |
1805 | break; | |
1806 | head->read_var2 = NULL; | |
1807 | head->read_step = 9; | |
1808 | case 9: | |
7762fbff TH |
1809 | if (!tomoyo_read_path_group_policy(head)) |
1810 | break; | |
1811 | head->read_var1 = NULL; | |
1812 | head->read_var2 = NULL; | |
1813 | head->read_step = 10; | |
1814 | case 10: | |
9590837b KT |
1815 | head->read_eof = true; |
1816 | break; | |
1817 | default: | |
1818 | return -EINVAL; | |
1819 | } | |
1820 | } | |
1821 | return 0; | |
1822 | } | |
1823 | ||
1824 | /* path to policy loader */ | |
1825 | static const char *tomoyo_loader = "/sbin/tomoyo-init"; | |
1826 | ||
1827 | /** | |
1828 | * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists. | |
1829 | * | |
1830 | * Returns true if /sbin/tomoyo-init exists, false otherwise. | |
1831 | */ | |
1832 | static bool tomoyo_policy_loader_exists(void) | |
1833 | { | |
1834 | /* | |
1835 | * Don't activate MAC if the policy loader doesn't exist. | |
1836 | * If the initrd includes /sbin/init but real-root-dev has not | |
1837 | * mounted on / yet, activating MAC will block the system since | |
1838 | * policies are not loaded yet. | |
1839 | * Thus, let do_execve() call this function everytime. | |
1840 | */ | |
e24977d4 | 1841 | struct path path; |
9590837b | 1842 | |
e24977d4 | 1843 | if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) { |
9590837b KT |
1844 | printk(KERN_INFO "Not activating Mandatory Access Control now " |
1845 | "since %s doesn't exist.\n", tomoyo_loader); | |
1846 | return false; | |
1847 | } | |
e24977d4 | 1848 | path_put(&path); |
9590837b KT |
1849 | return true; |
1850 | } | |
1851 | ||
1852 | /** | |
1853 | * tomoyo_load_policy - Run external policy loader to load policy. | |
1854 | * | |
1855 | * @filename: The program about to start. | |
1856 | * | |
1857 | * This function checks whether @filename is /sbin/init , and if so | |
1858 | * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init | |
1859 | * and then continues invocation of /sbin/init. | |
1860 | * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and | |
1861 | * writes to /sys/kernel/security/tomoyo/ interfaces. | |
1862 | * | |
1863 | * Returns nothing. | |
1864 | */ | |
1865 | void tomoyo_load_policy(const char *filename) | |
1866 | { | |
1867 | char *argv[2]; | |
1868 | char *envp[3]; | |
1869 | ||
1870 | if (tomoyo_policy_loaded) | |
1871 | return; | |
1872 | /* | |
1873 | * Check filename is /sbin/init or /sbin/tomoyo-start. | |
1874 | * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't | |
1875 | * be passed. | |
1876 | * You can create /sbin/tomoyo-start by | |
1877 | * "ln -s /bin/true /sbin/tomoyo-start". | |
1878 | */ | |
1879 | if (strcmp(filename, "/sbin/init") && | |
1880 | strcmp(filename, "/sbin/tomoyo-start")) | |
1881 | return; | |
1882 | if (!tomoyo_policy_loader_exists()) | |
1883 | return; | |
1884 | ||
1885 | printk(KERN_INFO "Calling %s to load policy. Please wait.\n", | |
1886 | tomoyo_loader); | |
1887 | argv[0] = (char *) tomoyo_loader; | |
1888 | argv[1] = NULL; | |
1889 | envp[0] = "HOME=/"; | |
1890 | envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
1891 | envp[2] = NULL; | |
1892 | call_usermodehelper(argv[0], argv, envp, 1); | |
1893 | ||
39826a1e | 1894 | printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n"); |
9590837b KT |
1895 | printk(KERN_INFO "Mandatory Access Control activated.\n"); |
1896 | tomoyo_policy_loaded = true; | |
1897 | { /* Check all profiles currently assigned to domains are defined. */ | |
1898 | struct tomoyo_domain_info *domain; | |
fdb8ebb7 | 1899 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
9590837b KT |
1900 | const u8 profile = domain->profile; |
1901 | if (tomoyo_profile_ptr[profile]) | |
1902 | continue; | |
1903 | panic("Profile %u (used by '%s') not defined.\n", | |
1904 | profile, domain->domainname->name); | |
1905 | } | |
9590837b KT |
1906 | } |
1907 | } | |
1908 | ||
1909 | /** | |
1910 | * tomoyo_read_version: Get version. | |
1911 | * | |
1912 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1913 | * | |
1914 | * Returns version information. | |
1915 | */ | |
1916 | static int tomoyo_read_version(struct tomoyo_io_buffer *head) | |
1917 | { | |
1918 | if (!head->read_eof) { | |
39826a1e | 1919 | tomoyo_io_printf(head, "2.2.0"); |
9590837b KT |
1920 | head->read_eof = true; |
1921 | } | |
1922 | return 0; | |
1923 | } | |
1924 | ||
1925 | /** | |
1926 | * tomoyo_read_self_domain - Get the current process's domainname. | |
1927 | * | |
1928 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1929 | * | |
1930 | * Returns the current process's domainname. | |
1931 | */ | |
1932 | static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head) | |
1933 | { | |
1934 | if (!head->read_eof) { | |
1935 | /* | |
1936 | * tomoyo_domain()->domainname != NULL | |
1937 | * because every process belongs to a domain and | |
1938 | * the domain's name cannot be NULL. | |
1939 | */ | |
1940 | tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); | |
1941 | head->read_eof = true; | |
1942 | } | |
1943 | return 0; | |
1944 | } | |
1945 | ||
1946 | /** | |
1947 | * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. | |
1948 | * | |
1949 | * @type: Type of interface. | |
1950 | * @file: Pointer to "struct file". | |
1951 | * | |
1952 | * Associates policy handler and returns 0 on success, -ENOMEM otherwise. | |
fdb8ebb7 TH |
1953 | * |
1954 | * Caller acquires tomoyo_read_lock(). | |
9590837b KT |
1955 | */ |
1956 | static int tomoyo_open_control(const u8 type, struct file *file) | |
1957 | { | |
4e5d6f7e | 1958 | struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); |
9590837b KT |
1959 | |
1960 | if (!head) | |
1961 | return -ENOMEM; | |
1962 | mutex_init(&head->io_sem); | |
1963 | switch (type) { | |
1964 | case TOMOYO_DOMAINPOLICY: | |
1965 | /* /sys/kernel/security/tomoyo/domain_policy */ | |
1966 | head->write = tomoyo_write_domain_policy; | |
1967 | head->read = tomoyo_read_domain_policy; | |
1968 | break; | |
1969 | case TOMOYO_EXCEPTIONPOLICY: | |
1970 | /* /sys/kernel/security/tomoyo/exception_policy */ | |
1971 | head->write = tomoyo_write_exception_policy; | |
1972 | head->read = tomoyo_read_exception_policy; | |
1973 | break; | |
1974 | case TOMOYO_SELFDOMAIN: | |
1975 | /* /sys/kernel/security/tomoyo/self_domain */ | |
1976 | head->read = tomoyo_read_self_domain; | |
1977 | break; | |
1978 | case TOMOYO_DOMAIN_STATUS: | |
1979 | /* /sys/kernel/security/tomoyo/.domain_status */ | |
1980 | head->write = tomoyo_write_domain_profile; | |
1981 | head->read = tomoyo_read_domain_profile; | |
1982 | break; | |
1983 | case TOMOYO_PROCESS_STATUS: | |
1984 | /* /sys/kernel/security/tomoyo/.process_status */ | |
1985 | head->write = tomoyo_write_pid; | |
1986 | head->read = tomoyo_read_pid; | |
1987 | break; | |
1988 | case TOMOYO_VERSION: | |
1989 | /* /sys/kernel/security/tomoyo/version */ | |
1990 | head->read = tomoyo_read_version; | |
1991 | head->readbuf_size = 128; | |
1992 | break; | |
1993 | case TOMOYO_MEMINFO: | |
1994 | /* /sys/kernel/security/tomoyo/meminfo */ | |
1995 | head->write = tomoyo_write_memory_quota; | |
1996 | head->read = tomoyo_read_memory_counter; | |
1997 | head->readbuf_size = 512; | |
1998 | break; | |
1999 | case TOMOYO_PROFILE: | |
2000 | /* /sys/kernel/security/tomoyo/profile */ | |
2001 | head->write = tomoyo_write_profile; | |
2002 | head->read = tomoyo_read_profile; | |
2003 | break; | |
2004 | case TOMOYO_MANAGER: | |
2005 | /* /sys/kernel/security/tomoyo/manager */ | |
2006 | head->write = tomoyo_write_manager_policy; | |
2007 | head->read = tomoyo_read_manager_policy; | |
2008 | break; | |
2009 | } | |
2010 | if (!(file->f_mode & FMODE_READ)) { | |
2011 | /* | |
2012 | * No need to allocate read_buf since it is not opened | |
2013 | * for reading. | |
2014 | */ | |
2015 | head->read = NULL; | |
2016 | } else { | |
2017 | if (!head->readbuf_size) | |
2018 | head->readbuf_size = 4096 * 2; | |
4e5d6f7e | 2019 | head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); |
9590837b | 2020 | if (!head->read_buf) { |
8e2d39a1 | 2021 | kfree(head); |
9590837b KT |
2022 | return -ENOMEM; |
2023 | } | |
2024 | } | |
2025 | if (!(file->f_mode & FMODE_WRITE)) { | |
2026 | /* | |
2027 | * No need to allocate write_buf since it is not opened | |
2028 | * for writing. | |
2029 | */ | |
2030 | head->write = NULL; | |
2031 | } else if (head->write) { | |
2032 | head->writebuf_size = 4096 * 2; | |
4e5d6f7e | 2033 | head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); |
9590837b | 2034 | if (!head->write_buf) { |
8e2d39a1 TH |
2035 | kfree(head->read_buf); |
2036 | kfree(head); | |
9590837b KT |
2037 | return -ENOMEM; |
2038 | } | |
2039 | } | |
fdb8ebb7 | 2040 | head->reader_idx = tomoyo_read_lock(); |
9590837b KT |
2041 | file->private_data = head; |
2042 | /* | |
2043 | * Call the handler now if the file is | |
2044 | * /sys/kernel/security/tomoyo/self_domain | |
2045 | * so that the user can use | |
2046 | * cat < /sys/kernel/security/tomoyo/self_domain" | |
2047 | * to know the current process's domainname. | |
2048 | */ | |
2049 | if (type == TOMOYO_SELFDOMAIN) | |
2050 | tomoyo_read_control(file, NULL, 0); | |
2051 | return 0; | |
2052 | } | |
2053 | ||
2054 | /** | |
2055 | * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. | |
2056 | * | |
2057 | * @file: Pointer to "struct file". | |
2058 | * @buffer: Poiner to buffer to write to. | |
2059 | * @buffer_len: Size of @buffer. | |
2060 | * | |
2061 | * Returns bytes read on success, negative value otherwise. | |
fdb8ebb7 TH |
2062 | * |
2063 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
2064 | */ |
2065 | static int tomoyo_read_control(struct file *file, char __user *buffer, | |
2066 | const int buffer_len) | |
2067 | { | |
2068 | int len = 0; | |
2069 | struct tomoyo_io_buffer *head = file->private_data; | |
2070 | char *cp; | |
2071 | ||
2072 | if (!head->read) | |
2073 | return -ENOSYS; | |
2074 | if (mutex_lock_interruptible(&head->io_sem)) | |
2075 | return -EINTR; | |
2076 | /* Call the policy handler. */ | |
2077 | len = head->read(head); | |
2078 | if (len < 0) | |
2079 | goto out; | |
2080 | /* Write to buffer. */ | |
2081 | len = head->read_avail; | |
2082 | if (len > buffer_len) | |
2083 | len = buffer_len; | |
2084 | if (!len) | |
2085 | goto out; | |
2086 | /* head->read_buf changes by some functions. */ | |
2087 | cp = head->read_buf; | |
2088 | if (copy_to_user(buffer, cp, len)) { | |
2089 | len = -EFAULT; | |
2090 | goto out; | |
2091 | } | |
2092 | head->read_avail -= len; | |
2093 | memmove(cp, cp + len, head->read_avail); | |
2094 | out: | |
2095 | mutex_unlock(&head->io_sem); | |
2096 | return len; | |
2097 | } | |
2098 | ||
2099 | /** | |
2100 | * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. | |
2101 | * | |
2102 | * @file: Pointer to "struct file". | |
2103 | * @buffer: Pointer to buffer to read from. | |
2104 | * @buffer_len: Size of @buffer. | |
2105 | * | |
2106 | * Returns @buffer_len on success, negative value otherwise. | |
fdb8ebb7 TH |
2107 | * |
2108 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
2109 | */ |
2110 | static int tomoyo_write_control(struct file *file, const char __user *buffer, | |
2111 | const int buffer_len) | |
2112 | { | |
2113 | struct tomoyo_io_buffer *head = file->private_data; | |
2114 | int error = buffer_len; | |
2115 | int avail_len = buffer_len; | |
2116 | char *cp0 = head->write_buf; | |
2117 | ||
2118 | if (!head->write) | |
2119 | return -ENOSYS; | |
2120 | if (!access_ok(VERIFY_READ, buffer, buffer_len)) | |
2121 | return -EFAULT; | |
2122 | /* Don't allow updating policies by non manager programs. */ | |
2123 | if (head->write != tomoyo_write_pid && | |
2124 | head->write != tomoyo_write_domain_policy && | |
2125 | !tomoyo_is_policy_manager()) | |
2126 | return -EPERM; | |
2127 | if (mutex_lock_interruptible(&head->io_sem)) | |
2128 | return -EINTR; | |
2129 | /* Read a line and dispatch it to the policy handler. */ | |
2130 | while (avail_len > 0) { | |
2131 | char c; | |
2132 | if (head->write_avail >= head->writebuf_size - 1) { | |
2133 | error = -ENOMEM; | |
2134 | break; | |
2135 | } else if (get_user(c, buffer)) { | |
2136 | error = -EFAULT; | |
2137 | break; | |
2138 | } | |
2139 | buffer++; | |
2140 | avail_len--; | |
2141 | cp0[head->write_avail++] = c; | |
2142 | if (c != '\n') | |
2143 | continue; | |
2144 | cp0[head->write_avail - 1] = '\0'; | |
2145 | head->write_avail = 0; | |
2146 | tomoyo_normalize_line(cp0); | |
2147 | head->write(head); | |
2148 | } | |
2149 | mutex_unlock(&head->io_sem); | |
2150 | return error; | |
2151 | } | |
2152 | ||
2153 | /** | |
2154 | * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. | |
2155 | * | |
2156 | * @file: Pointer to "struct file". | |
2157 | * | |
2158 | * Releases memory and returns 0. | |
fdb8ebb7 TH |
2159 | * |
2160 | * Caller looses tomoyo_read_lock(). | |
9590837b KT |
2161 | */ |
2162 | static int tomoyo_close_control(struct file *file) | |
2163 | { | |
2164 | struct tomoyo_io_buffer *head = file->private_data; | |
847b173e | 2165 | const bool is_write = !!head->write_buf; |
9590837b | 2166 | |
fdb8ebb7 | 2167 | tomoyo_read_unlock(head->reader_idx); |
9590837b | 2168 | /* Release memory used for policy I/O. */ |
8e2d39a1 | 2169 | kfree(head->read_buf); |
9590837b | 2170 | head->read_buf = NULL; |
8e2d39a1 | 2171 | kfree(head->write_buf); |
9590837b | 2172 | head->write_buf = NULL; |
8e2d39a1 | 2173 | kfree(head); |
9590837b KT |
2174 | head = NULL; |
2175 | file->private_data = NULL; | |
847b173e TH |
2176 | if (is_write) |
2177 | tomoyo_run_gc(); | |
9590837b KT |
2178 | return 0; |
2179 | } | |
2180 | ||
9590837b KT |
2181 | /** |
2182 | * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface. | |
2183 | * | |
2184 | * @inode: Pointer to "struct inode". | |
2185 | * @file: Pointer to "struct file". | |
2186 | * | |
2187 | * Returns 0 on success, negative value otherwise. | |
2188 | */ | |
2189 | static int tomoyo_open(struct inode *inode, struct file *file) | |
2190 | { | |
2191 | const int key = ((u8 *) file->f_path.dentry->d_inode->i_private) | |
2192 | - ((u8 *) NULL); | |
2193 | return tomoyo_open_control(key, file); | |
2194 | } | |
2195 | ||
2196 | /** | |
2197 | * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface. | |
2198 | * | |
2199 | * @inode: Pointer to "struct inode". | |
2200 | * @file: Pointer to "struct file". | |
2201 | * | |
2202 | * Returns 0 on success, negative value otherwise. | |
2203 | */ | |
2204 | static int tomoyo_release(struct inode *inode, struct file *file) | |
2205 | { | |
2206 | return tomoyo_close_control(file); | |
2207 | } | |
2208 | ||
2209 | /** | |
2210 | * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface. | |
2211 | * | |
2212 | * @file: Pointer to "struct file". | |
2213 | * @buf: Pointer to buffer. | |
2214 | * @count: Size of @buf. | |
2215 | * @ppos: Unused. | |
2216 | * | |
2217 | * Returns bytes read on success, negative value otherwise. | |
2218 | */ | |
2219 | static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count, | |
2220 | loff_t *ppos) | |
2221 | { | |
2222 | return tomoyo_read_control(file, buf, count); | |
2223 | } | |
2224 | ||
2225 | /** | |
2226 | * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface. | |
2227 | * | |
2228 | * @file: Pointer to "struct file". | |
2229 | * @buf: Pointer to buffer. | |
2230 | * @count: Size of @buf. | |
2231 | * @ppos: Unused. | |
2232 | * | |
2233 | * Returns @count on success, negative value otherwise. | |
2234 | */ | |
2235 | static ssize_t tomoyo_write(struct file *file, const char __user *buf, | |
2236 | size_t count, loff_t *ppos) | |
2237 | { | |
2238 | return tomoyo_write_control(file, buf, count); | |
2239 | } | |
2240 | ||
c3fa109a TH |
2241 | /* |
2242 | * tomoyo_operations is a "struct file_operations" which is used for handling | |
2243 | * /sys/kernel/security/tomoyo/ interface. | |
2244 | * | |
2245 | * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR). | |
2246 | * See tomoyo_io_buffer for internals. | |
2247 | */ | |
9590837b KT |
2248 | static const struct file_operations tomoyo_operations = { |
2249 | .open = tomoyo_open, | |
2250 | .release = tomoyo_release, | |
2251 | .read = tomoyo_read, | |
2252 | .write = tomoyo_write, | |
2253 | }; | |
2254 | ||
2255 | /** | |
2256 | * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory. | |
2257 | * | |
2258 | * @name: The name of the interface file. | |
2259 | * @mode: The permission of the interface file. | |
2260 | * @parent: The parent directory. | |
2261 | * @key: Type of interface. | |
2262 | * | |
2263 | * Returns nothing. | |
2264 | */ | |
2265 | static void __init tomoyo_create_entry(const char *name, const mode_t mode, | |
2266 | struct dentry *parent, const u8 key) | |
2267 | { | |
2268 | securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key, | |
2269 | &tomoyo_operations); | |
2270 | } | |
2271 | ||
2272 | /** | |
2273 | * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface. | |
2274 | * | |
2275 | * Returns 0. | |
2276 | */ | |
2277 | static int __init tomoyo_initerface_init(void) | |
2278 | { | |
2279 | struct dentry *tomoyo_dir; | |
2280 | ||
e5a3b95f TH |
2281 | /* Don't create securityfs entries unless registered. */ |
2282 | if (current_cred()->security != &tomoyo_kernel_domain) | |
2283 | return 0; | |
2284 | ||
9590837b KT |
2285 | tomoyo_dir = securityfs_create_dir("tomoyo", NULL); |
2286 | tomoyo_create_entry("domain_policy", 0600, tomoyo_dir, | |
2287 | TOMOYO_DOMAINPOLICY); | |
2288 | tomoyo_create_entry("exception_policy", 0600, tomoyo_dir, | |
2289 | TOMOYO_EXCEPTIONPOLICY); | |
2290 | tomoyo_create_entry("self_domain", 0400, tomoyo_dir, | |
2291 | TOMOYO_SELFDOMAIN); | |
2292 | tomoyo_create_entry(".domain_status", 0600, tomoyo_dir, | |
2293 | TOMOYO_DOMAIN_STATUS); | |
2294 | tomoyo_create_entry(".process_status", 0600, tomoyo_dir, | |
2295 | TOMOYO_PROCESS_STATUS); | |
2296 | tomoyo_create_entry("meminfo", 0600, tomoyo_dir, | |
2297 | TOMOYO_MEMINFO); | |
2298 | tomoyo_create_entry("profile", 0600, tomoyo_dir, | |
2299 | TOMOYO_PROFILE); | |
2300 | tomoyo_create_entry("manager", 0600, tomoyo_dir, | |
2301 | TOMOYO_MANAGER); | |
2302 | tomoyo_create_entry("version", 0400, tomoyo_dir, | |
2303 | TOMOYO_VERSION); | |
2304 | return 0; | |
2305 | } | |
2306 | ||
2307 | fs_initcall(tomoyo_initerface_init); |