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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> | |
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? */ | |
20 | bool tomoyo_policy_loaded; | |
21 | ||
22 | /* String table for functionality that takes 4 modes. */ | |
23 | static const char *tomoyo_mode_4[4] = { | |
24 | "disabled", "learning", "permissive", "enforcing" | |
25 | }; | |
26 | /* String table for functionality that takes 2 modes. */ | |
27 | static const char *tomoyo_mode_2[4] = { | |
28 | "disabled", "enabled", "enabled", "enabled" | |
29 | }; | |
30 | ||
c3fa109a TH |
31 | /* |
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 | */ | |
9590837b KT |
38 | static 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 | ||
c3fa109a TH |
48 | /* |
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 | */ | |
9590837b KT |
55 | static 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? */ | |
61 | static bool tomoyo_manage_by_non_root; | |
62 | ||
63 | /* Utility functions. */ | |
64 | ||
65 | /* Open operation for /sys/kernel/security/tomoyo/ interface. */ | |
66 | static int tomoyo_open_control(const u8 type, struct file *file); | |
67 | /* Close /sys/kernel/security/tomoyo/ interface. */ | |
68 | static int tomoyo_close_control(struct file *file); | |
69 | /* Read operation for /sys/kernel/security/tomoyo/ interface. */ | |
70 | static int tomoyo_read_control(struct file *file, char __user *buffer, | |
71 | const int buffer_len); | |
72 | /* Write operation for /sys/kernel/security/tomoyo/ interface. */ | |
73 | static 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 | */ | |
86 | static 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 | */ | |
100 | static 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 | */ | |
114 | static 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 | */ | |
130 | static 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 | */ | |
152 | static 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 | */ | |
186 | bool 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 | */ | |
271 | bool 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 | */ | |
332 | bool 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 | */ | |
347 | struct 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 | */ | |
372 | static 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 | */ | |
396 | static 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 | */ | |
438 | void tomoyo_fill_path_info(struct tomoyo_path_info *ptr) | |
439 | { | |
440 | const char *name = ptr->name; | |
441 | const int len = strlen(name); | |
442 | ||
9590837b KT |
443 | 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 | */ | |
461 | static 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 | */ | |
579 | static 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 | */ | |
629 | bool 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 | */ | |
686 | bool 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 | */ | |
712 | static 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 | */ | |
738 | const 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 | */ | |
756 | unsigned 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 | */ | |
779 | bool 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 | */ | |
791 | bool 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 | */ | |
871 | static 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; | |
9590837b KT |
880 | 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); | |
9590837b KT |
893 | 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 | */ | |
903 | static 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 | */ | |
968 | static 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 | ||
c3fa109a TH |
1021 | /* |
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 | */ | |
9590837b KT |
1034 | struct 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 | ||
c3fa109a TH |
1042 | /* |
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 | */ | |
9590837b KT |
1072 | static LIST_HEAD(tomoyo_policy_manager_list); |
1073 | static 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 | */ | |
1083 | static 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; | |
9590837b KT |
1103 | 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); | |
9590837b KT |
1124 | 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 | */ | |
1134 | static 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 | */ | |
1153 | static 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; | |
7d2948b1 TH |
1168 | done = tomoyo_io_printf(head, "%s\n", ptr->manager->name); |
1169 | if (!done) | |
9590837b | 1170 | break; |
9590837b KT |
1171 | } |
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 | */ | |
1183 | static 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 | */ | |
1239 | static 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; | |
9590837b KT |
1247 | 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); | |
9590837b KT |
1252 | } 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 | /** | |
1288 | * tomoyo_write_domain_policy - Write domain policy. | |
1289 | * | |
1290 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1291 | * | |
1292 | * Returns 0 on success, negative value otherwise. | |
1293 | */ | |
1294 | static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) | |
1295 | { | |
1296 | char *data = head->write_buf; | |
1297 | struct tomoyo_domain_info *domain = head->write_var1; | |
1298 | bool is_delete = false; | |
1299 | bool is_select = false; | |
9590837b KT |
1300 | unsigned int profile; |
1301 | ||
1302 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) | |
1303 | is_delete = true; | |
1304 | else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) | |
1305 | is_select = true; | |
9590837b KT |
1306 | if (is_select && tomoyo_is_select_one(head, data)) |
1307 | return 0; | |
1308 | /* Don't allow updating policies by non manager programs. */ | |
1309 | if (!tomoyo_is_policy_manager()) | |
1310 | return -EPERM; | |
1311 | if (tomoyo_is_domain_def(data)) { | |
1312 | domain = NULL; | |
1313 | if (is_delete) | |
1314 | tomoyo_delete_domain(data); | |
1315 | else if (is_select) { | |
1316 | down_read(&tomoyo_domain_list_lock); | |
1317 | domain = tomoyo_find_domain(data); | |
1318 | up_read(&tomoyo_domain_list_lock); | |
a0558fc3 | 1319 | } else |
9590837b KT |
1320 | domain = tomoyo_find_or_assign_new_domain(data, 0); |
1321 | head->write_var1 = domain; | |
1322 | return 0; | |
1323 | } | |
1324 | if (!domain) | |
1325 | return -EINVAL; | |
1326 | ||
1327 | if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 | |
1328 | && profile < TOMOYO_MAX_PROFILES) { | |
1329 | if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) | |
1330 | domain->profile = (u8) profile; | |
1331 | return 0; | |
1332 | } | |
1333 | if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { | |
1334 | tomoyo_set_domain_flag(domain, is_delete, | |
1335 | TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ); | |
1336 | return 0; | |
1337 | } | |
1338 | return tomoyo_write_file_policy(data, domain, is_delete); | |
1339 | } | |
1340 | ||
1341 | /** | |
1342 | * tomoyo_print_single_path_acl - Print a single path ACL entry. | |
1343 | * | |
1344 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1345 | * @ptr: Pointer to "struct tomoyo_single_path_acl_record". | |
1346 | * | |
1347 | * Returns true on success, false otherwise. | |
1348 | */ | |
1349 | static bool tomoyo_print_single_path_acl(struct tomoyo_io_buffer *head, | |
1350 | struct tomoyo_single_path_acl_record * | |
1351 | ptr) | |
1352 | { | |
1353 | int pos; | |
1354 | u8 bit; | |
1355 | const char *atmark = ""; | |
1356 | const char *filename; | |
1357 | const u16 perm = ptr->perm; | |
1358 | ||
1359 | filename = ptr->filename->name; | |
1360 | for (bit = head->read_bit; bit < TOMOYO_MAX_SINGLE_PATH_OPERATION; | |
1361 | bit++) { | |
1362 | const char *msg; | |
1363 | if (!(perm & (1 << bit))) | |
1364 | continue; | |
1365 | /* Print "read/write" instead of "read" and "write". */ | |
1366 | if ((bit == TOMOYO_TYPE_READ_ACL || | |
1367 | bit == TOMOYO_TYPE_WRITE_ACL) | |
1368 | && (perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))) | |
1369 | continue; | |
1370 | msg = tomoyo_sp2keyword(bit); | |
1371 | pos = head->read_avail; | |
1372 | if (!tomoyo_io_printf(head, "allow_%s %s%s\n", msg, | |
1373 | atmark, filename)) | |
1374 | goto out; | |
1375 | } | |
1376 | head->read_bit = 0; | |
1377 | return true; | |
1378 | out: | |
1379 | head->read_bit = bit; | |
1380 | head->read_avail = pos; | |
1381 | return false; | |
1382 | } | |
1383 | ||
1384 | /** | |
1385 | * tomoyo_print_double_path_acl - Print a double path ACL entry. | |
1386 | * | |
1387 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1388 | * @ptr: Pointer to "struct tomoyo_double_path_acl_record". | |
1389 | * | |
1390 | * Returns true on success, false otherwise. | |
1391 | */ | |
1392 | static bool tomoyo_print_double_path_acl(struct tomoyo_io_buffer *head, | |
1393 | struct tomoyo_double_path_acl_record * | |
1394 | ptr) | |
1395 | { | |
1396 | int pos; | |
1397 | const char *atmark1 = ""; | |
1398 | const char *atmark2 = ""; | |
1399 | const char *filename1; | |
1400 | const char *filename2; | |
1401 | const u8 perm = ptr->perm; | |
1402 | u8 bit; | |
1403 | ||
1404 | filename1 = ptr->filename1->name; | |
1405 | filename2 = ptr->filename2->name; | |
1406 | for (bit = head->read_bit; bit < TOMOYO_MAX_DOUBLE_PATH_OPERATION; | |
1407 | bit++) { | |
1408 | const char *msg; | |
1409 | if (!(perm & (1 << bit))) | |
1410 | continue; | |
1411 | msg = tomoyo_dp2keyword(bit); | |
1412 | pos = head->read_avail; | |
1413 | if (!tomoyo_io_printf(head, "allow_%s %s%s %s%s\n", msg, | |
1414 | atmark1, filename1, atmark2, filename2)) | |
1415 | goto out; | |
1416 | } | |
1417 | head->read_bit = 0; | |
1418 | return true; | |
1419 | out: | |
1420 | head->read_bit = bit; | |
1421 | head->read_avail = pos; | |
1422 | return false; | |
1423 | } | |
1424 | ||
1425 | /** | |
1426 | * tomoyo_print_entry - Print an ACL entry. | |
1427 | * | |
1428 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1429 | * @ptr: Pointer to an ACL entry. | |
1430 | * | |
1431 | * Returns true on success, false otherwise. | |
1432 | */ | |
1433 | static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, | |
1434 | struct tomoyo_acl_info *ptr) | |
1435 | { | |
1436 | const u8 acl_type = tomoyo_acl_type2(ptr); | |
1437 | ||
1438 | if (acl_type & TOMOYO_ACL_DELETED) | |
1439 | return true; | |
1440 | if (acl_type == TOMOYO_TYPE_SINGLE_PATH_ACL) { | |
1441 | struct tomoyo_single_path_acl_record *acl | |
1442 | = container_of(ptr, | |
1443 | struct tomoyo_single_path_acl_record, | |
1444 | head); | |
1445 | return tomoyo_print_single_path_acl(head, acl); | |
1446 | } | |
1447 | if (acl_type == TOMOYO_TYPE_DOUBLE_PATH_ACL) { | |
1448 | struct tomoyo_double_path_acl_record *acl | |
1449 | = container_of(ptr, | |
1450 | struct tomoyo_double_path_acl_record, | |
1451 | head); | |
1452 | return tomoyo_print_double_path_acl(head, acl); | |
1453 | } | |
1454 | BUG(); /* This must not happen. */ | |
1455 | return false; | |
1456 | } | |
1457 | ||
1458 | /** | |
1459 | * tomoyo_read_domain_policy - Read domain policy. | |
1460 | * | |
1461 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1462 | * | |
1463 | * Returns 0. | |
1464 | */ | |
1465 | static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) | |
1466 | { | |
1467 | struct list_head *dpos; | |
1468 | struct list_head *apos; | |
1469 | bool done = true; | |
1470 | ||
1471 | if (head->read_eof) | |
1472 | return 0; | |
1473 | if (head->read_step == 0) | |
1474 | head->read_step = 1; | |
1475 | down_read(&tomoyo_domain_list_lock); | |
1476 | list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) { | |
1477 | struct tomoyo_domain_info *domain; | |
1478 | const char *quota_exceeded = ""; | |
1479 | const char *transition_failed = ""; | |
1480 | const char *ignore_global_allow_read = ""; | |
1481 | domain = list_entry(dpos, struct tomoyo_domain_info, list); | |
1482 | if (head->read_step != 1) | |
1483 | goto acl_loop; | |
1484 | if (domain->is_deleted && !head->read_single_domain) | |
1485 | continue; | |
1486 | /* Print domainname and flags. */ | |
1487 | if (domain->quota_warned) | |
1488 | quota_exceeded = "quota_exceeded\n"; | |
1489 | if (domain->flags & TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED) | |
1490 | transition_failed = "transition_failed\n"; | |
1491 | if (domain->flags & | |
1492 | TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ) | |
1493 | ignore_global_allow_read | |
1494 | = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; | |
7d2948b1 TH |
1495 | done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE |
1496 | "%u\n%s%s%s\n", | |
1497 | domain->domainname->name, | |
1498 | domain->profile, quota_exceeded, | |
1499 | transition_failed, | |
1500 | ignore_global_allow_read); | |
1501 | if (!done) | |
9590837b | 1502 | break; |
9590837b KT |
1503 | head->read_step = 2; |
1504 | acl_loop: | |
1505 | if (head->read_step == 3) | |
1506 | goto tail_mark; | |
1507 | /* Print ACL entries in the domain. */ | |
1508 | down_read(&tomoyo_domain_acl_info_list_lock); | |
1509 | list_for_each_cookie(apos, head->read_var2, | |
7d2948b1 | 1510 | &domain->acl_info_list) { |
9590837b KT |
1511 | struct tomoyo_acl_info *ptr |
1512 | = list_entry(apos, struct tomoyo_acl_info, | |
7d2948b1 TH |
1513 | list); |
1514 | done = tomoyo_print_entry(head, ptr); | |
1515 | if (!done) | |
9590837b | 1516 | break; |
9590837b KT |
1517 | } |
1518 | up_read(&tomoyo_domain_acl_info_list_lock); | |
1519 | if (!done) | |
1520 | break; | |
1521 | head->read_step = 3; | |
1522 | tail_mark: | |
7d2948b1 TH |
1523 | done = tomoyo_io_printf(head, "\n"); |
1524 | if (!done) | |
9590837b | 1525 | break; |
9590837b KT |
1526 | head->read_step = 1; |
1527 | if (head->read_single_domain) | |
1528 | break; | |
1529 | } | |
1530 | up_read(&tomoyo_domain_list_lock); | |
1531 | head->read_eof = done; | |
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | /** | |
1536 | * tomoyo_write_domain_profile - Assign profile for specified domain. | |
1537 | * | |
1538 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1539 | * | |
1540 | * Returns 0 on success, -EINVAL otherwise. | |
1541 | * | |
1542 | * This is equivalent to doing | |
1543 | * | |
1544 | * ( echo "select " $domainname; echo "use_profile " $profile ) | | |
1545 | * /usr/lib/ccs/loadpolicy -d | |
1546 | */ | |
1547 | static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) | |
1548 | { | |
1549 | char *data = head->write_buf; | |
1550 | char *cp = strchr(data, ' '); | |
1551 | struct tomoyo_domain_info *domain; | |
1552 | unsigned long profile; | |
1553 | ||
1554 | if (!cp) | |
1555 | return -EINVAL; | |
1556 | *cp = '\0'; | |
1557 | down_read(&tomoyo_domain_list_lock); | |
1558 | domain = tomoyo_find_domain(cp + 1); | |
1559 | up_read(&tomoyo_domain_list_lock); | |
1560 | if (strict_strtoul(data, 10, &profile)) | |
1561 | return -EINVAL; | |
1562 | if (domain && profile < TOMOYO_MAX_PROFILES | |
1563 | && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) | |
1564 | domain->profile = (u8) profile; | |
1565 | return 0; | |
1566 | } | |
1567 | ||
1568 | /** | |
1569 | * tomoyo_read_domain_profile - Read only domainname and profile. | |
1570 | * | |
1571 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1572 | * | |
1573 | * Returns list of profile number and domainname pairs. | |
1574 | * | |
1575 | * This is equivalent to doing | |
1576 | * | |
1577 | * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | | |
1578 | * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) | |
1579 | * domainname = $0; } else if ( $1 == "use_profile" ) { | |
1580 | * print $2 " " domainname; domainname = ""; } } ; ' | |
1581 | */ | |
1582 | static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) | |
1583 | { | |
1584 | struct list_head *pos; | |
1585 | bool done = true; | |
1586 | ||
1587 | if (head->read_eof) | |
1588 | return 0; | |
1589 | down_read(&tomoyo_domain_list_lock); | |
1590 | list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) { | |
1591 | struct tomoyo_domain_info *domain; | |
1592 | domain = list_entry(pos, struct tomoyo_domain_info, list); | |
1593 | if (domain->is_deleted) | |
1594 | continue; | |
7d2948b1 TH |
1595 | done = tomoyo_io_printf(head, "%u %s\n", domain->profile, |
1596 | domain->domainname->name); | |
1597 | if (!done) | |
9590837b | 1598 | break; |
9590837b KT |
1599 | } |
1600 | up_read(&tomoyo_domain_list_lock); | |
1601 | head->read_eof = done; | |
1602 | return 0; | |
1603 | } | |
1604 | ||
1605 | /** | |
1606 | * tomoyo_write_pid: Specify PID to obtain domainname. | |
1607 | * | |
1608 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1609 | * | |
1610 | * Returns 0. | |
1611 | */ | |
1612 | static int tomoyo_write_pid(struct tomoyo_io_buffer *head) | |
1613 | { | |
1614 | unsigned long pid; | |
1615 | /* No error check. */ | |
1616 | strict_strtoul(head->write_buf, 10, &pid); | |
1617 | head->read_step = (int) pid; | |
1618 | head->read_eof = false; | |
1619 | return 0; | |
1620 | } | |
1621 | ||
1622 | /** | |
1623 | * tomoyo_read_pid - Get domainname of the specified PID. | |
1624 | * | |
1625 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1626 | * | |
1627 | * Returns the domainname which the specified PID is in on success, | |
1628 | * empty string otherwise. | |
1629 | * The PID is specified by tomoyo_write_pid() so that the user can obtain | |
1630 | * using read()/write() interface rather than sysctl() interface. | |
1631 | */ | |
1632 | static int tomoyo_read_pid(struct tomoyo_io_buffer *head) | |
1633 | { | |
1634 | if (head->read_avail == 0 && !head->read_eof) { | |
1635 | const int pid = head->read_step; | |
1636 | struct task_struct *p; | |
1637 | struct tomoyo_domain_info *domain = NULL; | |
9590837b KT |
1638 | read_lock(&tasklist_lock); |
1639 | p = find_task_by_vpid(pid); | |
1640 | if (p) | |
1641 | domain = tomoyo_real_domain(p); | |
1642 | read_unlock(&tasklist_lock); | |
9590837b KT |
1643 | if (domain) |
1644 | tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, | |
1645 | domain->domainname->name); | |
1646 | head->read_eof = true; | |
1647 | } | |
1648 | return 0; | |
1649 | } | |
1650 | ||
1651 | /** | |
1652 | * tomoyo_write_exception_policy - Write exception policy. | |
1653 | * | |
1654 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1655 | * | |
1656 | * Returns 0 on success, negative value otherwise. | |
1657 | */ | |
1658 | static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) | |
1659 | { | |
1660 | char *data = head->write_buf; | |
1661 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
1662 | ||
1663 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN)) | |
1664 | return tomoyo_write_domain_keeper_policy(data, false, | |
1665 | is_delete); | |
1666 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN)) | |
1667 | return tomoyo_write_domain_keeper_policy(data, true, is_delete); | |
1668 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN)) | |
1669 | return tomoyo_write_domain_initializer_policy(data, false, | |
1670 | is_delete); | |
1671 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN)) | |
1672 | return tomoyo_write_domain_initializer_policy(data, true, | |
1673 | is_delete); | |
1674 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS)) | |
1675 | return tomoyo_write_alias_policy(data, is_delete); | |
1676 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) | |
1677 | return tomoyo_write_globally_readable_policy(data, is_delete); | |
1678 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) | |
1679 | return tomoyo_write_pattern_policy(data, is_delete); | |
1680 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) | |
1681 | return tomoyo_write_no_rewrite_policy(data, is_delete); | |
1682 | return -EINVAL; | |
1683 | } | |
1684 | ||
1685 | /** | |
1686 | * tomoyo_read_exception_policy - Read exception policy. | |
1687 | * | |
1688 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1689 | * | |
1690 | * Returns 0 on success, -EINVAL otherwise. | |
1691 | */ | |
1692 | static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) | |
1693 | { | |
1694 | if (!head->read_eof) { | |
1695 | switch (head->read_step) { | |
1696 | case 0: | |
1697 | head->read_var2 = NULL; | |
1698 | head->read_step = 1; | |
1699 | case 1: | |
1700 | if (!tomoyo_read_domain_keeper_policy(head)) | |
1701 | break; | |
1702 | head->read_var2 = NULL; | |
1703 | head->read_step = 2; | |
1704 | case 2: | |
1705 | if (!tomoyo_read_globally_readable_policy(head)) | |
1706 | break; | |
1707 | head->read_var2 = NULL; | |
1708 | head->read_step = 3; | |
1709 | case 3: | |
1710 | head->read_var2 = NULL; | |
1711 | head->read_step = 4; | |
1712 | case 4: | |
1713 | if (!tomoyo_read_domain_initializer_policy(head)) | |
1714 | break; | |
1715 | head->read_var2 = NULL; | |
1716 | head->read_step = 5; | |
1717 | case 5: | |
1718 | if (!tomoyo_read_alias_policy(head)) | |
1719 | break; | |
1720 | head->read_var2 = NULL; | |
1721 | head->read_step = 6; | |
1722 | case 6: | |
1723 | head->read_var2 = NULL; | |
1724 | head->read_step = 7; | |
1725 | case 7: | |
1726 | if (!tomoyo_read_file_pattern(head)) | |
1727 | break; | |
1728 | head->read_var2 = NULL; | |
1729 | head->read_step = 8; | |
1730 | case 8: | |
1731 | if (!tomoyo_read_no_rewrite_policy(head)) | |
1732 | break; | |
1733 | head->read_var2 = NULL; | |
1734 | head->read_step = 9; | |
1735 | case 9: | |
1736 | head->read_eof = true; | |
1737 | break; | |
1738 | default: | |
1739 | return -EINVAL; | |
1740 | } | |
1741 | } | |
1742 | return 0; | |
1743 | } | |
1744 | ||
1745 | /* path to policy loader */ | |
1746 | static const char *tomoyo_loader = "/sbin/tomoyo-init"; | |
1747 | ||
1748 | /** | |
1749 | * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists. | |
1750 | * | |
1751 | * Returns true if /sbin/tomoyo-init exists, false otherwise. | |
1752 | */ | |
1753 | static bool tomoyo_policy_loader_exists(void) | |
1754 | { | |
1755 | /* | |
1756 | * Don't activate MAC if the policy loader doesn't exist. | |
1757 | * If the initrd includes /sbin/init but real-root-dev has not | |
1758 | * mounted on / yet, activating MAC will block the system since | |
1759 | * policies are not loaded yet. | |
1760 | * Thus, let do_execve() call this function everytime. | |
1761 | */ | |
e24977d4 | 1762 | struct path path; |
9590837b | 1763 | |
e24977d4 | 1764 | if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) { |
9590837b KT |
1765 | printk(KERN_INFO "Not activating Mandatory Access Control now " |
1766 | "since %s doesn't exist.\n", tomoyo_loader); | |
1767 | return false; | |
1768 | } | |
e24977d4 | 1769 | path_put(&path); |
9590837b KT |
1770 | return true; |
1771 | } | |
1772 | ||
1773 | /** | |
1774 | * tomoyo_load_policy - Run external policy loader to load policy. | |
1775 | * | |
1776 | * @filename: The program about to start. | |
1777 | * | |
1778 | * This function checks whether @filename is /sbin/init , and if so | |
1779 | * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init | |
1780 | * and then continues invocation of /sbin/init. | |
1781 | * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and | |
1782 | * writes to /sys/kernel/security/tomoyo/ interfaces. | |
1783 | * | |
1784 | * Returns nothing. | |
1785 | */ | |
1786 | void tomoyo_load_policy(const char *filename) | |
1787 | { | |
1788 | char *argv[2]; | |
1789 | char *envp[3]; | |
1790 | ||
1791 | if (tomoyo_policy_loaded) | |
1792 | return; | |
1793 | /* | |
1794 | * Check filename is /sbin/init or /sbin/tomoyo-start. | |
1795 | * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't | |
1796 | * be passed. | |
1797 | * You can create /sbin/tomoyo-start by | |
1798 | * "ln -s /bin/true /sbin/tomoyo-start". | |
1799 | */ | |
1800 | if (strcmp(filename, "/sbin/init") && | |
1801 | strcmp(filename, "/sbin/tomoyo-start")) | |
1802 | return; | |
1803 | if (!tomoyo_policy_loader_exists()) | |
1804 | return; | |
1805 | ||
1806 | printk(KERN_INFO "Calling %s to load policy. Please wait.\n", | |
1807 | tomoyo_loader); | |
1808 | argv[0] = (char *) tomoyo_loader; | |
1809 | argv[1] = NULL; | |
1810 | envp[0] = "HOME=/"; | |
1811 | envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
1812 | envp[2] = NULL; | |
1813 | call_usermodehelper(argv[0], argv, envp, 1); | |
1814 | ||
39826a1e | 1815 | printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n"); |
9590837b KT |
1816 | printk(KERN_INFO "Mandatory Access Control activated.\n"); |
1817 | tomoyo_policy_loaded = true; | |
1818 | { /* Check all profiles currently assigned to domains are defined. */ | |
1819 | struct tomoyo_domain_info *domain; | |
1820 | down_read(&tomoyo_domain_list_lock); | |
1821 | list_for_each_entry(domain, &tomoyo_domain_list, list) { | |
1822 | const u8 profile = domain->profile; | |
1823 | if (tomoyo_profile_ptr[profile]) | |
1824 | continue; | |
1825 | panic("Profile %u (used by '%s') not defined.\n", | |
1826 | profile, domain->domainname->name); | |
1827 | } | |
1828 | up_read(&tomoyo_domain_list_lock); | |
1829 | } | |
1830 | } | |
1831 | ||
1832 | /** | |
1833 | * tomoyo_read_version: Get version. | |
1834 | * | |
1835 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1836 | * | |
1837 | * Returns version information. | |
1838 | */ | |
1839 | static int tomoyo_read_version(struct tomoyo_io_buffer *head) | |
1840 | { | |
1841 | if (!head->read_eof) { | |
39826a1e | 1842 | tomoyo_io_printf(head, "2.2.0"); |
9590837b KT |
1843 | head->read_eof = true; |
1844 | } | |
1845 | return 0; | |
1846 | } | |
1847 | ||
1848 | /** | |
1849 | * tomoyo_read_self_domain - Get the current process's domainname. | |
1850 | * | |
1851 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1852 | * | |
1853 | * Returns the current process's domainname. | |
1854 | */ | |
1855 | static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head) | |
1856 | { | |
1857 | if (!head->read_eof) { | |
1858 | /* | |
1859 | * tomoyo_domain()->domainname != NULL | |
1860 | * because every process belongs to a domain and | |
1861 | * the domain's name cannot be NULL. | |
1862 | */ | |
1863 | tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); | |
1864 | head->read_eof = true; | |
1865 | } | |
1866 | return 0; | |
1867 | } | |
1868 | ||
1869 | /** | |
1870 | * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. | |
1871 | * | |
1872 | * @type: Type of interface. | |
1873 | * @file: Pointer to "struct file". | |
1874 | * | |
1875 | * Associates policy handler and returns 0 on success, -ENOMEM otherwise. | |
1876 | */ | |
1877 | static int tomoyo_open_control(const u8 type, struct file *file) | |
1878 | { | |
1879 | struct tomoyo_io_buffer *head = tomoyo_alloc(sizeof(*head)); | |
1880 | ||
1881 | if (!head) | |
1882 | return -ENOMEM; | |
1883 | mutex_init(&head->io_sem); | |
1884 | switch (type) { | |
1885 | case TOMOYO_DOMAINPOLICY: | |
1886 | /* /sys/kernel/security/tomoyo/domain_policy */ | |
1887 | head->write = tomoyo_write_domain_policy; | |
1888 | head->read = tomoyo_read_domain_policy; | |
1889 | break; | |
1890 | case TOMOYO_EXCEPTIONPOLICY: | |
1891 | /* /sys/kernel/security/tomoyo/exception_policy */ | |
1892 | head->write = tomoyo_write_exception_policy; | |
1893 | head->read = tomoyo_read_exception_policy; | |
1894 | break; | |
1895 | case TOMOYO_SELFDOMAIN: | |
1896 | /* /sys/kernel/security/tomoyo/self_domain */ | |
1897 | head->read = tomoyo_read_self_domain; | |
1898 | break; | |
1899 | case TOMOYO_DOMAIN_STATUS: | |
1900 | /* /sys/kernel/security/tomoyo/.domain_status */ | |
1901 | head->write = tomoyo_write_domain_profile; | |
1902 | head->read = tomoyo_read_domain_profile; | |
1903 | break; | |
1904 | case TOMOYO_PROCESS_STATUS: | |
1905 | /* /sys/kernel/security/tomoyo/.process_status */ | |
1906 | head->write = tomoyo_write_pid; | |
1907 | head->read = tomoyo_read_pid; | |
1908 | break; | |
1909 | case TOMOYO_VERSION: | |
1910 | /* /sys/kernel/security/tomoyo/version */ | |
1911 | head->read = tomoyo_read_version; | |
1912 | head->readbuf_size = 128; | |
1913 | break; | |
1914 | case TOMOYO_MEMINFO: | |
1915 | /* /sys/kernel/security/tomoyo/meminfo */ | |
1916 | head->write = tomoyo_write_memory_quota; | |
1917 | head->read = tomoyo_read_memory_counter; | |
1918 | head->readbuf_size = 512; | |
1919 | break; | |
1920 | case TOMOYO_PROFILE: | |
1921 | /* /sys/kernel/security/tomoyo/profile */ | |
1922 | head->write = tomoyo_write_profile; | |
1923 | head->read = tomoyo_read_profile; | |
1924 | break; | |
1925 | case TOMOYO_MANAGER: | |
1926 | /* /sys/kernel/security/tomoyo/manager */ | |
1927 | head->write = tomoyo_write_manager_policy; | |
1928 | head->read = tomoyo_read_manager_policy; | |
1929 | break; | |
1930 | } | |
1931 | if (!(file->f_mode & FMODE_READ)) { | |
1932 | /* | |
1933 | * No need to allocate read_buf since it is not opened | |
1934 | * for reading. | |
1935 | */ | |
1936 | head->read = NULL; | |
1937 | } else { | |
1938 | if (!head->readbuf_size) | |
1939 | head->readbuf_size = 4096 * 2; | |
1940 | head->read_buf = tomoyo_alloc(head->readbuf_size); | |
1941 | if (!head->read_buf) { | |
1942 | tomoyo_free(head); | |
1943 | return -ENOMEM; | |
1944 | } | |
1945 | } | |
1946 | if (!(file->f_mode & FMODE_WRITE)) { | |
1947 | /* | |
1948 | * No need to allocate write_buf since it is not opened | |
1949 | * for writing. | |
1950 | */ | |
1951 | head->write = NULL; | |
1952 | } else if (head->write) { | |
1953 | head->writebuf_size = 4096 * 2; | |
1954 | head->write_buf = tomoyo_alloc(head->writebuf_size); | |
1955 | if (!head->write_buf) { | |
1956 | tomoyo_free(head->read_buf); | |
1957 | tomoyo_free(head); | |
1958 | return -ENOMEM; | |
1959 | } | |
1960 | } | |
1961 | file->private_data = head; | |
1962 | /* | |
1963 | * Call the handler now if the file is | |
1964 | * /sys/kernel/security/tomoyo/self_domain | |
1965 | * so that the user can use | |
1966 | * cat < /sys/kernel/security/tomoyo/self_domain" | |
1967 | * to know the current process's domainname. | |
1968 | */ | |
1969 | if (type == TOMOYO_SELFDOMAIN) | |
1970 | tomoyo_read_control(file, NULL, 0); | |
1971 | return 0; | |
1972 | } | |
1973 | ||
1974 | /** | |
1975 | * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. | |
1976 | * | |
1977 | * @file: Pointer to "struct file". | |
1978 | * @buffer: Poiner to buffer to write to. | |
1979 | * @buffer_len: Size of @buffer. | |
1980 | * | |
1981 | * Returns bytes read on success, negative value otherwise. | |
1982 | */ | |
1983 | static int tomoyo_read_control(struct file *file, char __user *buffer, | |
1984 | const int buffer_len) | |
1985 | { | |
1986 | int len = 0; | |
1987 | struct tomoyo_io_buffer *head = file->private_data; | |
1988 | char *cp; | |
1989 | ||
1990 | if (!head->read) | |
1991 | return -ENOSYS; | |
1992 | if (mutex_lock_interruptible(&head->io_sem)) | |
1993 | return -EINTR; | |
1994 | /* Call the policy handler. */ | |
1995 | len = head->read(head); | |
1996 | if (len < 0) | |
1997 | goto out; | |
1998 | /* Write to buffer. */ | |
1999 | len = head->read_avail; | |
2000 | if (len > buffer_len) | |
2001 | len = buffer_len; | |
2002 | if (!len) | |
2003 | goto out; | |
2004 | /* head->read_buf changes by some functions. */ | |
2005 | cp = head->read_buf; | |
2006 | if (copy_to_user(buffer, cp, len)) { | |
2007 | len = -EFAULT; | |
2008 | goto out; | |
2009 | } | |
2010 | head->read_avail -= len; | |
2011 | memmove(cp, cp + len, head->read_avail); | |
2012 | out: | |
2013 | mutex_unlock(&head->io_sem); | |
2014 | return len; | |
2015 | } | |
2016 | ||
2017 | /** | |
2018 | * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. | |
2019 | * | |
2020 | * @file: Pointer to "struct file". | |
2021 | * @buffer: Pointer to buffer to read from. | |
2022 | * @buffer_len: Size of @buffer. | |
2023 | * | |
2024 | * Returns @buffer_len on success, negative value otherwise. | |
2025 | */ | |
2026 | static int tomoyo_write_control(struct file *file, const char __user *buffer, | |
2027 | const int buffer_len) | |
2028 | { | |
2029 | struct tomoyo_io_buffer *head = file->private_data; | |
2030 | int error = buffer_len; | |
2031 | int avail_len = buffer_len; | |
2032 | char *cp0 = head->write_buf; | |
2033 | ||
2034 | if (!head->write) | |
2035 | return -ENOSYS; | |
2036 | if (!access_ok(VERIFY_READ, buffer, buffer_len)) | |
2037 | return -EFAULT; | |
2038 | /* Don't allow updating policies by non manager programs. */ | |
2039 | if (head->write != tomoyo_write_pid && | |
2040 | head->write != tomoyo_write_domain_policy && | |
2041 | !tomoyo_is_policy_manager()) | |
2042 | return -EPERM; | |
2043 | if (mutex_lock_interruptible(&head->io_sem)) | |
2044 | return -EINTR; | |
2045 | /* Read a line and dispatch it to the policy handler. */ | |
2046 | while (avail_len > 0) { | |
2047 | char c; | |
2048 | if (head->write_avail >= head->writebuf_size - 1) { | |
2049 | error = -ENOMEM; | |
2050 | break; | |
2051 | } else if (get_user(c, buffer)) { | |
2052 | error = -EFAULT; | |
2053 | break; | |
2054 | } | |
2055 | buffer++; | |
2056 | avail_len--; | |
2057 | cp0[head->write_avail++] = c; | |
2058 | if (c != '\n') | |
2059 | continue; | |
2060 | cp0[head->write_avail - 1] = '\0'; | |
2061 | head->write_avail = 0; | |
2062 | tomoyo_normalize_line(cp0); | |
2063 | head->write(head); | |
2064 | } | |
2065 | mutex_unlock(&head->io_sem); | |
2066 | return error; | |
2067 | } | |
2068 | ||
2069 | /** | |
2070 | * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. | |
2071 | * | |
2072 | * @file: Pointer to "struct file". | |
2073 | * | |
2074 | * Releases memory and returns 0. | |
2075 | */ | |
2076 | static int tomoyo_close_control(struct file *file) | |
2077 | { | |
2078 | struct tomoyo_io_buffer *head = file->private_data; | |
2079 | ||
2080 | /* Release memory used for policy I/O. */ | |
2081 | tomoyo_free(head->read_buf); | |
2082 | head->read_buf = NULL; | |
2083 | tomoyo_free(head->write_buf); | |
2084 | head->write_buf = NULL; | |
2085 | tomoyo_free(head); | |
2086 | head = NULL; | |
2087 | file->private_data = NULL; | |
2088 | return 0; | |
2089 | } | |
2090 | ||
2091 | /** | |
2092 | * tomoyo_alloc_acl_element - Allocate permanent memory for ACL entry. | |
2093 | * | |
2094 | * @acl_type: Type of ACL entry. | |
2095 | * | |
2096 | * Returns pointer to the ACL entry on success, NULL otherwise. | |
2097 | */ | |
2098 | void *tomoyo_alloc_acl_element(const u8 acl_type) | |
2099 | { | |
2100 | int len; | |
2101 | struct tomoyo_acl_info *ptr; | |
2102 | ||
2103 | switch (acl_type) { | |
2104 | case TOMOYO_TYPE_SINGLE_PATH_ACL: | |
2105 | len = sizeof(struct tomoyo_single_path_acl_record); | |
2106 | break; | |
2107 | case TOMOYO_TYPE_DOUBLE_PATH_ACL: | |
2108 | len = sizeof(struct tomoyo_double_path_acl_record); | |
2109 | break; | |
2110 | default: | |
2111 | return NULL; | |
2112 | } | |
2113 | ptr = tomoyo_alloc_element(len); | |
2114 | if (!ptr) | |
2115 | return NULL; | |
2116 | ptr->type = acl_type; | |
2117 | return ptr; | |
2118 | } | |
2119 | ||
2120 | /** | |
2121 | * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface. | |
2122 | * | |
2123 | * @inode: Pointer to "struct inode". | |
2124 | * @file: Pointer to "struct file". | |
2125 | * | |
2126 | * Returns 0 on success, negative value otherwise. | |
2127 | */ | |
2128 | static int tomoyo_open(struct inode *inode, struct file *file) | |
2129 | { | |
2130 | const int key = ((u8 *) file->f_path.dentry->d_inode->i_private) | |
2131 | - ((u8 *) NULL); | |
2132 | return tomoyo_open_control(key, file); | |
2133 | } | |
2134 | ||
2135 | /** | |
2136 | * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface. | |
2137 | * | |
2138 | * @inode: Pointer to "struct inode". | |
2139 | * @file: Pointer to "struct file". | |
2140 | * | |
2141 | * Returns 0 on success, negative value otherwise. | |
2142 | */ | |
2143 | static int tomoyo_release(struct inode *inode, struct file *file) | |
2144 | { | |
2145 | return tomoyo_close_control(file); | |
2146 | } | |
2147 | ||
2148 | /** | |
2149 | * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface. | |
2150 | * | |
2151 | * @file: Pointer to "struct file". | |
2152 | * @buf: Pointer to buffer. | |
2153 | * @count: Size of @buf. | |
2154 | * @ppos: Unused. | |
2155 | * | |
2156 | * Returns bytes read on success, negative value otherwise. | |
2157 | */ | |
2158 | static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count, | |
2159 | loff_t *ppos) | |
2160 | { | |
2161 | return tomoyo_read_control(file, buf, count); | |
2162 | } | |
2163 | ||
2164 | /** | |
2165 | * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface. | |
2166 | * | |
2167 | * @file: Pointer to "struct file". | |
2168 | * @buf: Pointer to buffer. | |
2169 | * @count: Size of @buf. | |
2170 | * @ppos: Unused. | |
2171 | * | |
2172 | * Returns @count on success, negative value otherwise. | |
2173 | */ | |
2174 | static ssize_t tomoyo_write(struct file *file, const char __user *buf, | |
2175 | size_t count, loff_t *ppos) | |
2176 | { | |
2177 | return tomoyo_write_control(file, buf, count); | |
2178 | } | |
2179 | ||
c3fa109a TH |
2180 | /* |
2181 | * tomoyo_operations is a "struct file_operations" which is used for handling | |
2182 | * /sys/kernel/security/tomoyo/ interface. | |
2183 | * | |
2184 | * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR). | |
2185 | * See tomoyo_io_buffer for internals. | |
2186 | */ | |
9590837b KT |
2187 | static const struct file_operations tomoyo_operations = { |
2188 | .open = tomoyo_open, | |
2189 | .release = tomoyo_release, | |
2190 | .read = tomoyo_read, | |
2191 | .write = tomoyo_write, | |
2192 | }; | |
2193 | ||
2194 | /** | |
2195 | * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory. | |
2196 | * | |
2197 | * @name: The name of the interface file. | |
2198 | * @mode: The permission of the interface file. | |
2199 | * @parent: The parent directory. | |
2200 | * @key: Type of interface. | |
2201 | * | |
2202 | * Returns nothing. | |
2203 | */ | |
2204 | static void __init tomoyo_create_entry(const char *name, const mode_t mode, | |
2205 | struct dentry *parent, const u8 key) | |
2206 | { | |
2207 | securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key, | |
2208 | &tomoyo_operations); | |
2209 | } | |
2210 | ||
2211 | /** | |
2212 | * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface. | |
2213 | * | |
2214 | * Returns 0. | |
2215 | */ | |
2216 | static int __init tomoyo_initerface_init(void) | |
2217 | { | |
2218 | struct dentry *tomoyo_dir; | |
2219 | ||
e5a3b95f TH |
2220 | /* Don't create securityfs entries unless registered. */ |
2221 | if (current_cred()->security != &tomoyo_kernel_domain) | |
2222 | return 0; | |
2223 | ||
9590837b KT |
2224 | tomoyo_dir = securityfs_create_dir("tomoyo", NULL); |
2225 | tomoyo_create_entry("domain_policy", 0600, tomoyo_dir, | |
2226 | TOMOYO_DOMAINPOLICY); | |
2227 | tomoyo_create_entry("exception_policy", 0600, tomoyo_dir, | |
2228 | TOMOYO_EXCEPTIONPOLICY); | |
2229 | tomoyo_create_entry("self_domain", 0400, tomoyo_dir, | |
2230 | TOMOYO_SELFDOMAIN); | |
2231 | tomoyo_create_entry(".domain_status", 0600, tomoyo_dir, | |
2232 | TOMOYO_DOMAIN_STATUS); | |
2233 | tomoyo_create_entry(".process_status", 0600, tomoyo_dir, | |
2234 | TOMOYO_PROCESS_STATUS); | |
2235 | tomoyo_create_entry("meminfo", 0600, tomoyo_dir, | |
2236 | TOMOYO_MEMINFO); | |
2237 | tomoyo_create_entry("profile", 0600, tomoyo_dir, | |
2238 | TOMOYO_PROFILE); | |
2239 | tomoyo_create_entry("manager", 0600, tomoyo_dir, | |
2240 | TOMOYO_MANAGER); | |
2241 | tomoyo_create_entry("version", 0400, tomoyo_dir, | |
2242 | TOMOYO_VERSION); | |
2243 | return 0; | |
2244 | } | |
2245 | ||
2246 | fs_initcall(tomoyo_initerface_init); |