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1 | /* |
2 | * security/tomoyo/file.c |
3 | * |
4 | * Pathname restriction functions. |
5 | * |
6 | * Copyright (C) 2005-2010 NTT DATA CORPORATION |
7 | */ |
8 | |
9 | #include "common.h" |
10 | #include <linux/slab.h> |
11 | |
12 | /* Keyword array for operations with one pathname. */ |
13 | const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { |
14 | [TOMOYO_TYPE_READ_WRITE] = "read/write", |
15 | [TOMOYO_TYPE_EXECUTE] = "execute", |
16 | [TOMOYO_TYPE_READ] = "read", |
17 | [TOMOYO_TYPE_WRITE] = "write", |
18 | [TOMOYO_TYPE_UNLINK] = "unlink", |
19 | [TOMOYO_TYPE_RMDIR] = "rmdir", |
20 | [TOMOYO_TYPE_TRUNCATE] = "truncate", |
21 | [TOMOYO_TYPE_SYMLINK] = "symlink", |
22 | [TOMOYO_TYPE_REWRITE] = "rewrite", |
23 | [TOMOYO_TYPE_CHROOT] = "chroot", |
24 | [TOMOYO_TYPE_UMOUNT] = "unmount", |
25 | }; |
26 | |
27 | /* Keyword array for operations with one pathname and three numbers. */ |
28 | const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION] = { |
29 | [TOMOYO_TYPE_MKBLOCK] = "mkblock", |
30 | [TOMOYO_TYPE_MKCHAR] = "mkchar", |
31 | }; |
32 | |
33 | /* Keyword array for operations with two pathnames. */ |
34 | const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { |
35 | [TOMOYO_TYPE_LINK] = "link", |
36 | [TOMOYO_TYPE_RENAME] = "rename", |
37 | [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", |
38 | }; |
39 | |
40 | /* Keyword array for operations with one pathname and one number. */ |
41 | const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { |
42 | [TOMOYO_TYPE_CREATE] = "create", |
43 | [TOMOYO_TYPE_MKDIR] = "mkdir", |
44 | [TOMOYO_TYPE_MKFIFO] = "mkfifo", |
45 | [TOMOYO_TYPE_MKSOCK] = "mksock", |
46 | [TOMOYO_TYPE_IOCTL] = "ioctl", |
47 | [TOMOYO_TYPE_CHMOD] = "chmod", |
48 | [TOMOYO_TYPE_CHOWN] = "chown", |
49 | [TOMOYO_TYPE_CHGRP] = "chgrp", |
50 | }; |
51 | |
52 | static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = { |
53 | [TOMOYO_TYPE_READ_WRITE] = TOMOYO_MAC_FILE_OPEN, |
54 | [TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE, |
55 | [TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN, |
56 | [TOMOYO_TYPE_WRITE] = TOMOYO_MAC_FILE_OPEN, |
57 | [TOMOYO_TYPE_UNLINK] = TOMOYO_MAC_FILE_UNLINK, |
58 | [TOMOYO_TYPE_RMDIR] = TOMOYO_MAC_FILE_RMDIR, |
59 | [TOMOYO_TYPE_TRUNCATE] = TOMOYO_MAC_FILE_TRUNCATE, |
60 | [TOMOYO_TYPE_SYMLINK] = TOMOYO_MAC_FILE_SYMLINK, |
61 | [TOMOYO_TYPE_REWRITE] = TOMOYO_MAC_FILE_REWRITE, |
62 | [TOMOYO_TYPE_CHROOT] = TOMOYO_MAC_FILE_CHROOT, |
63 | [TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT, |
64 | }; |
65 | |
66 | static const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = { |
67 | [TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK, |
68 | [TOMOYO_TYPE_MKCHAR] = TOMOYO_MAC_FILE_MKCHAR, |
69 | }; |
70 | |
71 | static const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = { |
72 | [TOMOYO_TYPE_LINK] = TOMOYO_MAC_FILE_LINK, |
73 | [TOMOYO_TYPE_RENAME] = TOMOYO_MAC_FILE_RENAME, |
74 | [TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT, |
75 | }; |
76 | |
77 | static const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { |
78 | [TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE, |
79 | [TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR, |
80 | [TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO, |
81 | [TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK, |
82 | [TOMOYO_TYPE_IOCTL] = TOMOYO_MAC_FILE_IOCTL, |
83 | [TOMOYO_TYPE_CHMOD] = TOMOYO_MAC_FILE_CHMOD, |
84 | [TOMOYO_TYPE_CHOWN] = TOMOYO_MAC_FILE_CHOWN, |
85 | [TOMOYO_TYPE_CHGRP] = TOMOYO_MAC_FILE_CHGRP, |
86 | }; |
87 | |
88 | void tomoyo_put_name_union(struct tomoyo_name_union *ptr) |
89 | { |
90 | if (!ptr) |
91 | return; |
92 | if (ptr->is_group) |
93 | tomoyo_put_group(ptr->group); |
94 | else |
95 | tomoyo_put_name(ptr->filename); |
96 | } |
97 | |
98 | const struct tomoyo_path_info * |
99 | tomoyo_compare_name_union(const struct tomoyo_path_info *name, |
100 | const struct tomoyo_name_union *ptr) |
101 | { |
102 | if (ptr->is_group) |
103 | return tomoyo_path_matches_group(name, ptr->group); |
104 | if (tomoyo_path_matches_pattern(name, ptr->filename)) |
105 | return ptr->filename; |
106 | return NULL; |
107 | } |
108 | |
109 | void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
110 | { |
111 | if (ptr && ptr->is_group) |
112 | tomoyo_put_group(ptr->group); |
113 | } |
114 | |
115 | bool tomoyo_compare_number_union(const unsigned long value, |
116 | const struct tomoyo_number_union *ptr) |
117 | { |
118 | if (ptr->is_group) |
119 | return tomoyo_number_matches_group(value, value, ptr->group); |
120 | return value >= ptr->values[0] && value <= ptr->values[1]; |
121 | } |
122 | |
123 | static void tomoyo_add_slash(struct tomoyo_path_info *buf) |
124 | { |
125 | if (buf->is_dir) |
126 | return; |
127 | /* |
128 | * This is OK because tomoyo_encode() reserves space for appending "/". |
129 | */ |
130 | strcat((char *) buf->name, "/"); |
131 | tomoyo_fill_path_info(buf); |
132 | } |
133 | |
134 | /** |
135 | * tomoyo_strendswith - Check whether the token ends with the given token. |
136 | * |
137 | * @name: The token to check. |
138 | * @tail: The token to find. |
139 | * |
140 | * Returns true if @name ends with @tail, false otherwise. |
141 | */ |
142 | static bool tomoyo_strendswith(const char *name, const char *tail) |
143 | { |
144 | int len; |
145 | |
146 | if (!name || !tail) |
147 | return false; |
148 | len = strlen(name) - strlen(tail); |
149 | return len >= 0 && !strcmp(name + len, tail); |
150 | } |
151 | |
152 | /** |
153 | * tomoyo_get_realpath - Get realpath. |
154 | * |
155 | * @buf: Pointer to "struct tomoyo_path_info". |
156 | * @path: Pointer to "struct path". |
157 | * |
158 | * Returns true on success, false otherwise. |
159 | */ |
160 | static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path) |
161 | { |
162 | buf->name = tomoyo_realpath_from_path(path); |
163 | if (buf->name) { |
164 | tomoyo_fill_path_info(buf); |
165 | return true; |
166 | } |
167 | return false; |
168 | } |
169 | |
170 | /** |
171 | * tomoyo_audit_path_log - Audit path request log. |
172 | * |
173 | * @r: Pointer to "struct tomoyo_request_info". |
174 | * |
175 | * Returns 0 on success, negative value otherwise. |
176 | */ |
177 | static int tomoyo_audit_path_log(struct tomoyo_request_info *r) |
178 | { |
179 | const char *operation = tomoyo_path_keyword[r->param.path.operation]; |
180 | const struct tomoyo_path_info *filename = r->param.path.filename; |
181 | if (r->granted) |
182 | return 0; |
183 | tomoyo_warn_log(r, "%s %s", operation, filename->name); |
184 | return tomoyo_supervisor(r, "allow_%s %s\n", operation, |
185 | tomoyo_pattern(filename)); |
186 | } |
187 | |
188 | /** |
189 | * tomoyo_audit_path2_log - Audit path/path request log. |
190 | * |
191 | * @r: Pointer to "struct tomoyo_request_info". |
192 | * |
193 | * Returns 0 on success, negative value otherwise. |
194 | */ |
195 | static int tomoyo_audit_path2_log(struct tomoyo_request_info *r) |
196 | { |
197 | const char *operation = tomoyo_path2_keyword[r->param.path2.operation]; |
198 | const struct tomoyo_path_info *filename1 = r->param.path2.filename1; |
199 | const struct tomoyo_path_info *filename2 = r->param.path2.filename2; |
200 | if (r->granted) |
201 | return 0; |
202 | tomoyo_warn_log(r, "%s %s %s", operation, filename1->name, |
203 | filename2->name); |
204 | return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, |
205 | tomoyo_pattern(filename1), |
206 | tomoyo_pattern(filename2)); |
207 | } |
208 | |
209 | /** |
210 | * tomoyo_audit_mkdev_log - Audit path/number/number/number request log. |
211 | * |
212 | * @r: Pointer to "struct tomoyo_request_info". |
213 | * |
214 | * Returns 0 on success, negative value otherwise. |
215 | */ |
216 | static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r) |
217 | { |
218 | const char *operation = tomoyo_mkdev_keyword[r->param.mkdev.operation]; |
219 | const struct tomoyo_path_info *filename = r->param.mkdev.filename; |
220 | const unsigned int major = r->param.mkdev.major; |
221 | const unsigned int minor = r->param.mkdev.minor; |
222 | const unsigned int mode = r->param.mkdev.mode; |
223 | if (r->granted) |
224 | return 0; |
225 | tomoyo_warn_log(r, "%s %s 0%o %u %u", operation, filename->name, mode, |
226 | major, minor); |
227 | return tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", operation, |
228 | tomoyo_pattern(filename), mode, major, minor); |
229 | } |
230 | |
231 | /** |
232 | * tomoyo_audit_path_number_log - Audit path/number request log. |
233 | * |
234 | * @r: Pointer to "struct tomoyo_request_info". |
235 | * @error: Error code. |
236 | * |
237 | * Returns 0 on success, negative value otherwise. |
238 | */ |
239 | static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r) |
240 | { |
241 | const u8 type = r->param.path_number.operation; |
242 | u8 radix; |
243 | const struct tomoyo_path_info *filename = r->param.path_number.filename; |
244 | const char *operation = tomoyo_path_number_keyword[type]; |
245 | char buffer[64]; |
246 | if (r->granted) |
247 | return 0; |
248 | switch (type) { |
249 | case TOMOYO_TYPE_CREATE: |
250 | case TOMOYO_TYPE_MKDIR: |
251 | case TOMOYO_TYPE_MKFIFO: |
252 | case TOMOYO_TYPE_MKSOCK: |
253 | case TOMOYO_TYPE_CHMOD: |
254 | radix = TOMOYO_VALUE_TYPE_OCTAL; |
255 | break; |
256 | case TOMOYO_TYPE_IOCTL: |
257 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; |
258 | break; |
259 | default: |
260 | radix = TOMOYO_VALUE_TYPE_DECIMAL; |
261 | break; |
262 | } |
263 | tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number, |
264 | radix); |
265 | tomoyo_warn_log(r, "%s %s %s", operation, filename->name, buffer); |
266 | return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, |
267 | tomoyo_pattern(filename), buffer); |
268 | } |
269 | |
270 | static bool tomoyo_same_globally_readable(const struct tomoyo_acl_head *a, |
271 | const struct tomoyo_acl_head *b) |
272 | { |
273 | return container_of(a, struct tomoyo_readable_file, |
274 | head)->filename == |
275 | container_of(b, struct tomoyo_readable_file, |
276 | head)->filename; |
277 | } |
278 | |
279 | /** |
280 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_readable_file" list. |
281 | * |
282 | * @filename: Filename unconditionally permitted to open() for reading. |
283 | * @is_delete: True if it is a delete request. |
284 | * |
285 | * Returns 0 on success, negative value otherwise. |
286 | * |
287 | * Caller holds tomoyo_read_lock(). |
288 | */ |
289 | static int tomoyo_update_globally_readable_entry(const char *filename, |
290 | const bool is_delete) |
291 | { |
292 | struct tomoyo_readable_file e = { }; |
293 | int error; |
294 | |
295 | if (!tomoyo_correct_word(filename)) |
296 | return -EINVAL; |
297 | e.filename = tomoyo_get_name(filename); |
298 | if (!e.filename) |
299 | return -ENOMEM; |
300 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
301 | &tomoyo_policy_list |
302 | [TOMOYO_ID_GLOBALLY_READABLE], |
303 | tomoyo_same_globally_readable); |
304 | tomoyo_put_name(e.filename); |
305 | return error; |
306 | } |
307 | |
308 | /** |
309 | * tomoyo_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. |
310 | * |
311 | * @filename: The filename to check. |
312 | * |
313 | * Returns true if any domain can open @filename for reading, false otherwise. |
314 | * |
315 | * Caller holds tomoyo_read_lock(). |
316 | */ |
317 | static bool tomoyo_globally_readable_file(const struct tomoyo_path_info * |
318 | filename) |
319 | { |
320 | struct tomoyo_readable_file *ptr; |
321 | bool found = false; |
322 | |
323 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list |
324 | [TOMOYO_ID_GLOBALLY_READABLE], head.list) { |
325 | if (!ptr->head.is_deleted && |
326 | tomoyo_path_matches_pattern(filename, ptr->filename)) { |
327 | found = true; |
328 | break; |
329 | } |
330 | } |
331 | return found; |
332 | } |
333 | |
334 | /** |
335 | * tomoyo_write_globally_readable - Write "struct tomoyo_readable_file" list. |
336 | * |
337 | * @data: String to parse. |
338 | * @is_delete: True if it is a delete request. |
339 | * |
340 | * Returns 0 on success, negative value otherwise. |
341 | * |
342 | * Caller holds tomoyo_read_lock(). |
343 | */ |
344 | int tomoyo_write_globally_readable(char *data, const bool is_delete) |
345 | { |
346 | return tomoyo_update_globally_readable_entry(data, is_delete); |
347 | } |
348 | |
349 | static bool tomoyo_same_pattern(const struct tomoyo_acl_head *a, |
350 | const struct tomoyo_acl_head *b) |
351 | { |
352 | return container_of(a, struct tomoyo_no_pattern, head)->pattern == |
353 | container_of(b, struct tomoyo_no_pattern, head)->pattern; |
354 | } |
355 | |
356 | /** |
357 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_no_pattern" list. |
358 | * |
359 | * @pattern: Pathname pattern. |
360 | * @is_delete: True if it is a delete request. |
361 | * |
362 | * Returns 0 on success, negative value otherwise. |
363 | * |
364 | * Caller holds tomoyo_read_lock(). |
365 | */ |
366 | static int tomoyo_update_file_pattern_entry(const char *pattern, |
367 | const bool is_delete) |
368 | { |
369 | struct tomoyo_no_pattern e = { }; |
370 | int error; |
371 | |
372 | if (!tomoyo_correct_word(pattern)) |
373 | return -EINVAL; |
374 | e.pattern = tomoyo_get_name(pattern); |
375 | if (!e.pattern) |
376 | return -ENOMEM; |
377 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
378 | &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
379 | tomoyo_same_pattern); |
380 | tomoyo_put_name(e.pattern); |
381 | return error; |
382 | } |
383 | |
384 | /** |
385 | * tomoyo_pattern - Get patterned pathname. |
386 | * |
387 | * @filename: The filename to find patterned pathname. |
388 | * |
389 | * Returns pointer to pathname pattern if matched, @filename otherwise. |
390 | * |
391 | * Caller holds tomoyo_read_lock(). |
392 | */ |
393 | const char *tomoyo_pattern(const struct tomoyo_path_info *filename) |
394 | { |
395 | struct tomoyo_no_pattern *ptr; |
396 | const struct tomoyo_path_info *pattern = NULL; |
397 | |
398 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
399 | head.list) { |
400 | if (ptr->head.is_deleted) |
401 | continue; |
402 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) |
403 | continue; |
404 | pattern = ptr->pattern; |
405 | if (tomoyo_strendswith(pattern->name, "/\\*")) { |
406 | /* Do nothing. Try to find the better match. */ |
407 | } else { |
408 | /* This would be the better match. Use this. */ |
409 | break; |
410 | } |
411 | } |
412 | if (pattern) |
413 | filename = pattern; |
414 | return filename->name; |
415 | } |
416 | |
417 | /** |
418 | * tomoyo_write_pattern - Write "struct tomoyo_no_pattern" list. |
419 | * |
420 | * @data: String to parse. |
421 | * @is_delete: True if it is a delete request. |
422 | * |
423 | * Returns 0 on success, negative value otherwise. |
424 | * |
425 | * Caller holds tomoyo_read_lock(). |
426 | */ |
427 | int tomoyo_write_pattern(char *data, const bool is_delete) |
428 | { |
429 | return tomoyo_update_file_pattern_entry(data, is_delete); |
430 | } |
431 | |
432 | static bool tomoyo_same_no_rewrite(const struct tomoyo_acl_head *a, |
433 | const struct tomoyo_acl_head *b) |
434 | { |
435 | return container_of(a, struct tomoyo_no_rewrite, head)->pattern |
436 | == container_of(b, struct tomoyo_no_rewrite, head) |
437 | ->pattern; |
438 | } |
439 | |
440 | /** |
441 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite" list. |
442 | * |
443 | * @pattern: Pathname pattern that are not rewritable by default. |
444 | * @is_delete: True if it is a delete request. |
445 | * |
446 | * Returns 0 on success, negative value otherwise. |
447 | * |
448 | * Caller holds tomoyo_read_lock(). |
449 | */ |
450 | static int tomoyo_update_no_rewrite_entry(const char *pattern, |
451 | const bool is_delete) |
452 | { |
453 | struct tomoyo_no_rewrite e = { }; |
454 | int error; |
455 | |
456 | if (!tomoyo_correct_word(pattern)) |
457 | return -EINVAL; |
458 | e.pattern = tomoyo_get_name(pattern); |
459 | if (!e.pattern) |
460 | return -ENOMEM; |
461 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
462 | &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
463 | tomoyo_same_no_rewrite); |
464 | tomoyo_put_name(e.pattern); |
465 | return error; |
466 | } |
467 | |
468 | /** |
469 | * tomoyo_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. |
470 | * |
471 | * @filename: Filename to check. |
472 | * |
473 | * Returns true if @filename is specified by "deny_rewrite" directive, |
474 | * false otherwise. |
475 | * |
476 | * Caller holds tomoyo_read_lock(). |
477 | */ |
478 | static bool tomoyo_no_rewrite_file(const struct tomoyo_path_info *filename) |
479 | { |
480 | struct tomoyo_no_rewrite *ptr; |
481 | bool found = false; |
482 | |
483 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
484 | head.list) { |
485 | if (ptr->head.is_deleted) |
486 | continue; |
487 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) |
488 | continue; |
489 | found = true; |
490 | break; |
491 | } |
492 | return found; |
493 | } |
494 | |
495 | /** |
496 | * tomoyo_write_no_rewrite - Write "struct tomoyo_no_rewrite" list. |
497 | * |
498 | * @data: String to parse. |
499 | * @is_delete: True if it is a delete request. |
500 | * |
501 | * Returns 0 on success, negative value otherwise. |
502 | * |
503 | * Caller holds tomoyo_read_lock(). |
504 | */ |
505 | int tomoyo_write_no_rewrite(char *data, const bool is_delete) |
506 | { |
507 | return tomoyo_update_no_rewrite_entry(data, is_delete); |
508 | } |
509 | |
510 | static bool tomoyo_check_path_acl(struct tomoyo_request_info *r, |
511 | const struct tomoyo_acl_info *ptr) |
512 | { |
513 | const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl), |
514 | head); |
515 | if (acl->perm & (1 << r->param.path.operation)) { |
516 | r->param.path.matched_path = |
517 | tomoyo_compare_name_union(r->param.path.filename, |
518 | &acl->name); |
519 | return r->param.path.matched_path != NULL; |
520 | } |
521 | return false; |
522 | } |
523 | |
524 | static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r, |
525 | const struct tomoyo_acl_info *ptr) |
526 | { |
527 | const struct tomoyo_path_number_acl *acl = |
528 | container_of(ptr, typeof(*acl), head); |
529 | return (acl->perm & (1 << r->param.path_number.operation)) && |
530 | tomoyo_compare_number_union(r->param.path_number.number, |
531 | &acl->number) && |
532 | tomoyo_compare_name_union(r->param.path_number.filename, |
533 | &acl->name); |
534 | } |
535 | |
536 | static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r, |
537 | const struct tomoyo_acl_info *ptr) |
538 | { |
539 | const struct tomoyo_path2_acl *acl = |
540 | container_of(ptr, typeof(*acl), head); |
541 | return (acl->perm & (1 << r->param.path2.operation)) && |
542 | tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1) |
543 | && tomoyo_compare_name_union(r->param.path2.filename2, |
544 | &acl->name2); |
545 | } |
546 | |
547 | static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r, |
548 | const struct tomoyo_acl_info *ptr) |
549 | { |
550 | const struct tomoyo_mkdev_acl *acl = |
551 | container_of(ptr, typeof(*acl), head); |
552 | return (acl->perm & (1 << r->param.mkdev.operation)) && |
553 | tomoyo_compare_number_union(r->param.mkdev.mode, |
554 | &acl->mode) && |
555 | tomoyo_compare_number_union(r->param.mkdev.major, |
556 | &acl->major) && |
557 | tomoyo_compare_number_union(r->param.mkdev.minor, |
558 | &acl->minor) && |
559 | tomoyo_compare_name_union(r->param.mkdev.filename, |
560 | &acl->name); |
561 | } |
562 | |
563 | static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, |
564 | const struct tomoyo_acl_info *b) |
565 | { |
566 | const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); |
567 | const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); |
568 | return tomoyo_same_acl_head(&p1->head, &p2->head) && |
569 | tomoyo_same_name_union(&p1->name, &p2->name); |
570 | } |
571 | |
572 | static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, |
573 | struct tomoyo_acl_info *b, |
574 | const bool is_delete) |
575 | { |
576 | u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head) |
577 | ->perm; |
578 | u16 perm = *a_perm; |
579 | const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; |
580 | if (is_delete) { |
581 | perm &= ~b_perm; |
582 | if ((perm & TOMOYO_RW_MASK) != TOMOYO_RW_MASK) |
583 | perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); |
584 | else if (!(perm & (1 << TOMOYO_TYPE_READ_WRITE))) |
585 | perm &= ~TOMOYO_RW_MASK; |
586 | } else { |
587 | perm |= b_perm; |
588 | if ((perm & TOMOYO_RW_MASK) == TOMOYO_RW_MASK) |
589 | perm |= (1 << TOMOYO_TYPE_READ_WRITE); |
590 | else if (perm & (1 << TOMOYO_TYPE_READ_WRITE)) |
591 | perm |= TOMOYO_RW_MASK; |
592 | } |
593 | *a_perm = perm; |
594 | return !perm; |
595 | } |
596 | |
597 | /** |
598 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
599 | * |
600 | * @type: Type of operation. |
601 | * @filename: Filename. |
602 | * @domain: Pointer to "struct tomoyo_domain_info". |
603 | * @is_delete: True if it is a delete request. |
604 | * |
605 | * Returns 0 on success, negative value otherwise. |
606 | * |
607 | * Caller holds tomoyo_read_lock(). |
608 | */ |
609 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
610 | struct tomoyo_domain_info * const domain, |
611 | const bool is_delete) |
612 | { |
613 | struct tomoyo_path_acl e = { |
614 | .head.type = TOMOYO_TYPE_PATH_ACL, |
615 | .perm = 1 << type |
616 | }; |
617 | int error; |
618 | if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE)) |
619 | e.perm |= TOMOYO_RW_MASK; |
620 | if (!tomoyo_parse_name_union(filename, &e.name)) |
621 | return -EINVAL; |
622 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
623 | tomoyo_same_path_acl, |
624 | tomoyo_merge_path_acl); |
625 | tomoyo_put_name_union(&e.name); |
626 | return error; |
627 | } |
628 | |
629 | static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a, |
630 | const struct tomoyo_acl_info *b) |
631 | { |
632 | const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), |
633 | head); |
634 | const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), |
635 | head); |
636 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
637 | && tomoyo_same_name_union(&p1->name, &p2->name) |
638 | && tomoyo_same_number_union(&p1->mode, &p2->mode) |
639 | && tomoyo_same_number_union(&p1->major, &p2->major) |
640 | && tomoyo_same_number_union(&p1->minor, &p2->minor); |
641 | } |
642 | |
643 | static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, |
644 | struct tomoyo_acl_info *b, |
645 | const bool is_delete) |
646 | { |
647 | u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl, |
648 | head)->perm; |
649 | u8 perm = *a_perm; |
650 | const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head) |
651 | ->perm; |
652 | if (is_delete) |
653 | perm &= ~b_perm; |
654 | else |
655 | perm |= b_perm; |
656 | *a_perm = perm; |
657 | return !perm; |
658 | } |
659 | |
660 | /** |
661 | * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list. |
662 | * |
663 | * @type: Type of operation. |
664 | * @filename: Filename. |
665 | * @mode: Create mode. |
666 | * @major: Device major number. |
667 | * @minor: Device minor number. |
668 | * @domain: Pointer to "struct tomoyo_domain_info". |
669 | * @is_delete: True if it is a delete request. |
670 | * |
671 | * Returns 0 on success, negative value otherwise. |
672 | * |
673 | * Caller holds tomoyo_read_lock(). |
674 | */ |
675 | static int tomoyo_update_mkdev_acl(const u8 type, const char *filename, |
676 | char *mode, char *major, char *minor, |
677 | struct tomoyo_domain_info * const |
678 | domain, const bool is_delete) |
679 | { |
680 | struct tomoyo_mkdev_acl e = { |
681 | .head.type = TOMOYO_TYPE_MKDEV_ACL, |
682 | .perm = 1 << type |
683 | }; |
684 | int error = is_delete ? -ENOENT : -ENOMEM; |
685 | if (!tomoyo_parse_name_union(filename, &e.name) || |
686 | !tomoyo_parse_number_union(mode, &e.mode) || |
687 | !tomoyo_parse_number_union(major, &e.major) || |
688 | !tomoyo_parse_number_union(minor, &e.minor)) |
689 | goto out; |
690 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
691 | tomoyo_same_mkdev_acl, |
692 | tomoyo_merge_mkdev_acl); |
693 | out: |
694 | tomoyo_put_name_union(&e.name); |
695 | tomoyo_put_number_union(&e.mode); |
696 | tomoyo_put_number_union(&e.major); |
697 | tomoyo_put_number_union(&e.minor); |
698 | return error; |
699 | } |
700 | |
701 | static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, |
702 | const struct tomoyo_acl_info *b) |
703 | { |
704 | const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); |
705 | const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); |
706 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
707 | && tomoyo_same_name_union(&p1->name1, &p2->name1) |
708 | && tomoyo_same_name_union(&p1->name2, &p2->name2); |
709 | } |
710 | |
711 | static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a, |
712 | struct tomoyo_acl_info *b, |
713 | const bool is_delete) |
714 | { |
715 | u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head) |
716 | ->perm; |
717 | u8 perm = *a_perm; |
718 | const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm; |
719 | if (is_delete) |
720 | perm &= ~b_perm; |
721 | else |
722 | perm |= b_perm; |
723 | *a_perm = perm; |
724 | return !perm; |
725 | } |
726 | |
727 | /** |
728 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
729 | * |
730 | * @type: Type of operation. |
731 | * @filename1: First filename. |
732 | * @filename2: Second filename. |
733 | * @domain: Pointer to "struct tomoyo_domain_info". |
734 | * @is_delete: True if it is a delete request. |
735 | * |
736 | * Returns 0 on success, negative value otherwise. |
737 | * |
738 | * Caller holds tomoyo_read_lock(). |
739 | */ |
740 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
741 | const char *filename2, |
742 | struct tomoyo_domain_info * const domain, |
743 | const bool is_delete) |
744 | { |
745 | struct tomoyo_path2_acl e = { |
746 | .head.type = TOMOYO_TYPE_PATH2_ACL, |
747 | .perm = 1 << type |
748 | }; |
749 | int error = is_delete ? -ENOENT : -ENOMEM; |
750 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
751 | !tomoyo_parse_name_union(filename2, &e.name2)) |
752 | goto out; |
753 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
754 | tomoyo_same_path2_acl, |
755 | tomoyo_merge_path2_acl); |
756 | out: |
757 | tomoyo_put_name_union(&e.name1); |
758 | tomoyo_put_name_union(&e.name2); |
759 | return error; |
760 | } |
761 | |
762 | /** |
763 | * tomoyo_path_permission - Check permission for single path operation. |
764 | * |
765 | * @r: Pointer to "struct tomoyo_request_info". |
766 | * @operation: Type of operation. |
767 | * @filename: Filename to check. |
768 | * |
769 | * Returns 0 on success, negative value otherwise. |
770 | * |
771 | * Caller holds tomoyo_read_lock(). |
772 | */ |
773 | int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
774 | const struct tomoyo_path_info *filename) |
775 | { |
776 | int error; |
777 | |
778 | next: |
779 | r->type = tomoyo_p2mac[operation]; |
780 | r->mode = tomoyo_get_mode(r->profile, r->type); |
781 | if (r->mode == TOMOYO_CONFIG_DISABLED) |
782 | return 0; |
783 | r->param_type = TOMOYO_TYPE_PATH_ACL; |
784 | r->param.path.filename = filename; |
785 | r->param.path.operation = operation; |
786 | do { |
787 | tomoyo_check_acl(r, tomoyo_check_path_acl); |
788 | if (!r->granted && operation == TOMOYO_TYPE_READ && |
789 | !r->domain->ignore_global_allow_read && |
790 | tomoyo_globally_readable_file(filename)) |
791 | r->granted = true; |
792 | error = tomoyo_audit_path_log(r); |
793 | /* |
794 | * Do not retry for execute request, for alias may have |
795 | * changed. |
796 | */ |
797 | } while (error == TOMOYO_RETRY_REQUEST && |
798 | operation != TOMOYO_TYPE_EXECUTE); |
799 | /* |
800 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, |
801 | * we need to check "allow_rewrite" permission if the filename is |
802 | * specified by "deny_rewrite" keyword. |
803 | */ |
804 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
805 | tomoyo_no_rewrite_file(filename)) { |
806 | operation = TOMOYO_TYPE_REWRITE; |
807 | goto next; |
808 | } |
809 | return error; |
810 | } |
811 | |
812 | static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, |
813 | const struct tomoyo_acl_info *b) |
814 | { |
815 | const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1), |
816 | head); |
817 | const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), |
818 | head); |
819 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
820 | && tomoyo_same_name_union(&p1->name, &p2->name) |
821 | && tomoyo_same_number_union(&p1->number, &p2->number); |
822 | } |
823 | |
824 | static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, |
825 | struct tomoyo_acl_info *b, |
826 | const bool is_delete) |
827 | { |
828 | u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl, |
829 | head)->perm; |
830 | u8 perm = *a_perm; |
831 | const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head) |
832 | ->perm; |
833 | if (is_delete) |
834 | perm &= ~b_perm; |
835 | else |
836 | perm |= b_perm; |
837 | *a_perm = perm; |
838 | return !perm; |
839 | } |
840 | |
841 | /** |
842 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. |
843 | * |
844 | * @type: Type of operation. |
845 | * @filename: Filename. |
846 | * @number: Number. |
847 | * @domain: Pointer to "struct tomoyo_domain_info". |
848 | * @is_delete: True if it is a delete request. |
849 | * |
850 | * Returns 0 on success, negative value otherwise. |
851 | */ |
852 | static int tomoyo_update_path_number_acl(const u8 type, const char *filename, |
853 | char *number, |
854 | struct tomoyo_domain_info * const |
855 | domain, |
856 | const bool is_delete) |
857 | { |
858 | struct tomoyo_path_number_acl e = { |
859 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, |
860 | .perm = 1 << type |
861 | }; |
862 | int error = is_delete ? -ENOENT : -ENOMEM; |
863 | if (!tomoyo_parse_name_union(filename, &e.name)) |
864 | return -EINVAL; |
865 | if (!tomoyo_parse_number_union(number, &e.number)) |
866 | goto out; |
867 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
868 | tomoyo_same_path_number_acl, |
869 | tomoyo_merge_path_number_acl); |
870 | out: |
871 | tomoyo_put_name_union(&e.name); |
872 | tomoyo_put_number_union(&e.number); |
873 | return error; |
874 | } |
875 | |
876 | /** |
877 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". |
878 | * |
879 | * @type: Type of operation. |
880 | * @path: Pointer to "struct path". |
881 | * @number: Number. |
882 | * |
883 | * Returns 0 on success, negative value otherwise. |
884 | */ |
885 | int tomoyo_path_number_perm(const u8 type, struct path *path, |
886 | unsigned long number) |
887 | { |
888 | struct tomoyo_request_info r; |
889 | int error = -ENOMEM; |
890 | struct tomoyo_path_info buf; |
891 | int idx; |
892 | |
893 | if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
894 | == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) |
895 | return 0; |
896 | idx = tomoyo_read_lock(); |
897 | if (!tomoyo_get_realpath(&buf, path)) |
898 | goto out; |
899 | if (type == TOMOYO_TYPE_MKDIR) |
900 | tomoyo_add_slash(&buf); |
901 | r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL; |
902 | r.param.path_number.operation = type; |
903 | r.param.path_number.filename = &buf; |
904 | r.param.path_number.number = number; |
905 | do { |
906 | tomoyo_check_acl(&r, tomoyo_check_path_number_acl); |
907 | error = tomoyo_audit_path_number_log(&r); |
908 | } while (error == TOMOYO_RETRY_REQUEST); |
909 | kfree(buf.name); |
910 | out: |
911 | tomoyo_read_unlock(idx); |
912 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
913 | error = 0; |
914 | return error; |
915 | } |
916 | |
917 | /** |
918 | * tomoyo_check_open_permission - Check permission for "read" and "write". |
919 | * |
920 | * @domain: Pointer to "struct tomoyo_domain_info". |
921 | * @path: Pointer to "struct path". |
922 | * @flag: Flags for open(). |
923 | * |
924 | * Returns 0 on success, negative value otherwise. |
925 | */ |
926 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, |
927 | struct path *path, const int flag) |
928 | { |
929 | const u8 acc_mode = ACC_MODE(flag); |
930 | int error = -ENOMEM; |
931 | struct tomoyo_path_info buf; |
932 | struct tomoyo_request_info r; |
933 | int idx; |
934 | |
935 | if (!path->mnt || |
936 | (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))) |
937 | return 0; |
938 | buf.name = NULL; |
939 | r.mode = TOMOYO_CONFIG_DISABLED; |
940 | idx = tomoyo_read_lock(); |
941 | if (!tomoyo_get_realpath(&buf, path)) |
942 | goto out; |
943 | error = 0; |
944 | /* |
945 | * If the filename is specified by "deny_rewrite" keyword, |
946 | * we need to check "allow_rewrite" permission when the filename is not |
947 | * opened for append mode or the filename is truncated at open time. |
948 | */ |
949 | if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND) |
950 | && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE) |
951 | != TOMOYO_CONFIG_DISABLED) { |
952 | if (!tomoyo_get_realpath(&buf, path)) { |
953 | error = -ENOMEM; |
954 | goto out; |
955 | } |
956 | if (tomoyo_no_rewrite_file(&buf)) |
957 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, |
958 | &buf); |
959 | } |
960 | if (!error && acc_mode && |
961 | tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) |
962 | != TOMOYO_CONFIG_DISABLED) { |
963 | u8 operation; |
964 | if (!buf.name && !tomoyo_get_realpath(&buf, path)) { |
965 | error = -ENOMEM; |
966 | goto out; |
967 | } |
968 | if (acc_mode == (MAY_READ | MAY_WRITE)) |
969 | operation = TOMOYO_TYPE_READ_WRITE; |
970 | else if (acc_mode == MAY_READ) |
971 | operation = TOMOYO_TYPE_READ; |
972 | else |
973 | operation = TOMOYO_TYPE_WRITE; |
974 | error = tomoyo_path_permission(&r, operation, &buf); |
975 | } |
976 | out: |
977 | kfree(buf.name); |
978 | tomoyo_read_unlock(idx); |
979 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
980 | error = 0; |
981 | return error; |
982 | } |
983 | |
984 | /** |
985 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
986 | * |
987 | * @operation: Type of operation. |
988 | * @path: Pointer to "struct path". |
989 | * |
990 | * Returns 0 on success, negative value otherwise. |
991 | */ |
992 | int tomoyo_path_perm(const u8 operation, struct path *path) |
993 | { |
994 | int error = -ENOMEM; |
995 | struct tomoyo_path_info buf; |
996 | struct tomoyo_request_info r; |
997 | int idx; |
998 | |
999 | if (!path->mnt) |
1000 | return 0; |
1001 | if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) |
1002 | == TOMOYO_CONFIG_DISABLED) |
1003 | return 0; |
1004 | buf.name = NULL; |
1005 | idx = tomoyo_read_lock(); |
1006 | if (!tomoyo_get_realpath(&buf, path)) |
1007 | goto out; |
1008 | switch (operation) { |
1009 | case TOMOYO_TYPE_REWRITE: |
1010 | if (!tomoyo_no_rewrite_file(&buf)) { |
1011 | error = 0; |
1012 | goto out; |
1013 | } |
1014 | break; |
1015 | case TOMOYO_TYPE_RMDIR: |
1016 | case TOMOYO_TYPE_CHROOT: |
1017 | case TOMOYO_TYPE_UMOUNT: |
1018 | tomoyo_add_slash(&buf); |
1019 | break; |
1020 | } |
1021 | error = tomoyo_path_permission(&r, operation, &buf); |
1022 | out: |
1023 | kfree(buf.name); |
1024 | tomoyo_read_unlock(idx); |
1025 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
1026 | error = 0; |
1027 | return error; |
1028 | } |
1029 | |
1030 | /** |
1031 | * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar". |
1032 | * |
1033 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) |
1034 | * @path: Pointer to "struct path". |
1035 | * @mode: Create mode. |
1036 | * @dev: Device number. |
1037 | * |
1038 | * Returns 0 on success, negative value otherwise. |
1039 | */ |
1040 | int tomoyo_mkdev_perm(const u8 operation, struct path *path, |
1041 | const unsigned int mode, unsigned int dev) |
1042 | { |
1043 | struct tomoyo_request_info r; |
1044 | int error = -ENOMEM; |
1045 | struct tomoyo_path_info buf; |
1046 | int idx; |
1047 | |
1048 | if (!path->mnt || |
1049 | tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) |
1050 | == TOMOYO_CONFIG_DISABLED) |
1051 | return 0; |
1052 | idx = tomoyo_read_lock(); |
1053 | error = -ENOMEM; |
1054 | if (tomoyo_get_realpath(&buf, path)) { |
1055 | dev = new_decode_dev(dev); |
1056 | r.param_type = TOMOYO_TYPE_MKDEV_ACL; |
1057 | r.param.mkdev.filename = &buf; |
1058 | r.param.mkdev.operation = operation; |
1059 | r.param.mkdev.mode = mode; |
1060 | r.param.mkdev.major = MAJOR(dev); |
1061 | r.param.mkdev.minor = MINOR(dev); |
1062 | tomoyo_check_acl(&r, tomoyo_check_mkdev_acl); |
1063 | error = tomoyo_audit_mkdev_log(&r); |
1064 | kfree(buf.name); |
1065 | } |
1066 | tomoyo_read_unlock(idx); |
1067 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
1068 | error = 0; |
1069 | return error; |
1070 | } |
1071 | |
1072 | /** |
1073 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
1074 | * |
1075 | * @operation: Type of operation. |
1076 | * @path1: Pointer to "struct path". |
1077 | * @path2: Pointer to "struct path". |
1078 | * |
1079 | * Returns 0 on success, negative value otherwise. |
1080 | */ |
1081 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
1082 | struct path *path2) |
1083 | { |
1084 | int error = -ENOMEM; |
1085 | struct tomoyo_path_info buf1; |
1086 | struct tomoyo_path_info buf2; |
1087 | struct tomoyo_request_info r; |
1088 | int idx; |
1089 | |
1090 | if (!path1->mnt || !path2->mnt || |
1091 | tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) |
1092 | == TOMOYO_CONFIG_DISABLED) |
1093 | return 0; |
1094 | buf1.name = NULL; |
1095 | buf2.name = NULL; |
1096 | idx = tomoyo_read_lock(); |
1097 | if (!tomoyo_get_realpath(&buf1, path1) || |
1098 | !tomoyo_get_realpath(&buf2, path2)) |
1099 | goto out; |
1100 | switch (operation) { |
1101 | struct dentry *dentry; |
1102 | case TOMOYO_TYPE_RENAME: |
1103 | case TOMOYO_TYPE_LINK: |
1104 | dentry = path1->dentry; |
1105 | if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) |
1106 | break; |
1107 | /* fall through */ |
1108 | case TOMOYO_TYPE_PIVOT_ROOT: |
1109 | tomoyo_add_slash(&buf1); |
1110 | tomoyo_add_slash(&buf2); |
1111 | break; |
1112 | } |
1113 | r.param_type = TOMOYO_TYPE_PATH2_ACL; |
1114 | r.param.path2.operation = operation; |
1115 | r.param.path2.filename1 = &buf1; |
1116 | r.param.path2.filename2 = &buf2; |
1117 | do { |
1118 | tomoyo_check_acl(&r, tomoyo_check_path2_acl); |
1119 | error = tomoyo_audit_path2_log(&r); |
1120 | } while (error == TOMOYO_RETRY_REQUEST); |
1121 | out: |
1122 | kfree(buf1.name); |
1123 | kfree(buf2.name); |
1124 | tomoyo_read_unlock(idx); |
1125 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
1126 | error = 0; |
1127 | return error; |
1128 | } |
1129 | |
1130 | /** |
1131 | * tomoyo_write_file - Update file related list. |
1132 | * |
1133 | * @data: String to parse. |
1134 | * @domain: Pointer to "struct tomoyo_domain_info". |
1135 | * @is_delete: True if it is a delete request. |
1136 | * |
1137 | * Returns 0 on success, negative value otherwise. |
1138 | * |
1139 | * Caller holds tomoyo_read_lock(). |
1140 | */ |
1141 | int tomoyo_write_file(char *data, struct tomoyo_domain_info *domain, |
1142 | const bool is_delete) |
1143 | { |
1144 | char *w[5]; |
1145 | u8 type; |
1146 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) |
1147 | return -EINVAL; |
1148 | if (strncmp(w[0], "allow_", 6)) |
1149 | goto out; |
1150 | w[0] += 6; |
1151 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { |
1152 | if (strcmp(w[0], tomoyo_path_keyword[type])) |
1153 | continue; |
1154 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); |
1155 | } |
1156 | if (!w[2][0]) |
1157 | goto out; |
1158 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { |
1159 | if (strcmp(w[0], tomoyo_path2_keyword[type])) |
1160 | continue; |
1161 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, |
1162 | is_delete); |
1163 | } |
1164 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { |
1165 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) |
1166 | continue; |
1167 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, |
1168 | is_delete); |
1169 | } |
1170 | if (!w[3][0] || !w[4][0]) |
1171 | goto out; |
1172 | for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) { |
1173 | if (strcmp(w[0], tomoyo_mkdev_keyword[type])) |
1174 | continue; |
1175 | return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3], |
1176 | w[4], domain, is_delete); |
1177 | } |
1178 | out: |
1179 | return -EINVAL; |
1180 | } |
1181 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
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jz-3.3
jz-3.4
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jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9