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Commit | Line | Data |
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b69a54ee KT |
1 | /* |
2 | * security/tomoyo/file.c | |
3 | * | |
c3ef1500 | 4 | * Pathname restriction functions. |
b69a54ee | 5 | * |
c3ef1500 | 6 | * Copyright (C) 2005-2010 NTT DATA CORPORATION |
b69a54ee KT |
7 | */ |
8 | ||
9 | #include "common.h" | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
b69a54ee | 11 | |
a1f9bb6a | 12 | /* Keyword array for operations with one pathname. */ |
71c28236 | 13 | const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { |
7ef61233 TH |
14 | [TOMOYO_TYPE_READ_WRITE] = "read/write", |
15 | [TOMOYO_TYPE_EXECUTE] = "execute", | |
16 | [TOMOYO_TYPE_READ] = "read", | |
17 | [TOMOYO_TYPE_WRITE] = "write", | |
7ef61233 | 18 | [TOMOYO_TYPE_UNLINK] = "unlink", |
7ef61233 | 19 | [TOMOYO_TYPE_RMDIR] = "rmdir", |
7ef61233 TH |
20 | [TOMOYO_TYPE_TRUNCATE] = "truncate", |
21 | [TOMOYO_TYPE_SYMLINK] = "symlink", | |
22 | [TOMOYO_TYPE_REWRITE] = "rewrite", | |
7ef61233 | 23 | [TOMOYO_TYPE_CHROOT] = "chroot", |
7ef61233 | 24 | [TOMOYO_TYPE_UMOUNT] = "unmount", |
b69a54ee KT |
25 | }; |
26 | ||
a1f9bb6a | 27 | /* Keyword array for operations with one pathname and three numbers. */ |
71c28236 | 28 | const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION] = { |
a1f9bb6a TH |
29 | [TOMOYO_TYPE_MKBLOCK] = "mkblock", |
30 | [TOMOYO_TYPE_MKCHAR] = "mkchar", | |
31 | }; | |
32 | ||
33 | /* Keyword array for operations with two pathnames. */ | |
71c28236 | 34 | const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { |
a1f9bb6a TH |
35 | [TOMOYO_TYPE_LINK] = "link", |
36 | [TOMOYO_TYPE_RENAME] = "rename", | |
7ef61233 | 37 | [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", |
b69a54ee KT |
38 | }; |
39 | ||
a1f9bb6a | 40 | /* Keyword array for operations with one pathname and one number. */ |
71c28236 | 41 | const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { |
a1f9bb6a TH |
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 | ||
57c2590f TH |
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 | ||
75093152 | 66 | static const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = { |
57c2590f TH |
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 | ||
7762fbff TH |
88 | void tomoyo_put_name_union(struct tomoyo_name_union *ptr) |
89 | { | |
90 | if (!ptr) | |
91 | return; | |
92 | if (ptr->is_group) | |
a98aa4de | 93 | tomoyo_put_group(ptr->group); |
7762fbff TH |
94 | else |
95 | tomoyo_put_name(ptr->filename); | |
96 | } | |
97 | ||
98 | bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, | |
99 | const struct tomoyo_name_union *ptr) | |
100 | { | |
101 | if (ptr->is_group) | |
3f629636 | 102 | return tomoyo_path_matches_group(name, ptr->group); |
7762fbff TH |
103 | return tomoyo_path_matches_pattern(name, ptr->filename); |
104 | } | |
105 | ||
4c3e9e2d TH |
106 | void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
107 | { | |
108 | if (ptr && ptr->is_group) | |
a98aa4de | 109 | tomoyo_put_group(ptr->group); |
4c3e9e2d TH |
110 | } |
111 | ||
112 | bool tomoyo_compare_number_union(const unsigned long value, | |
113 | const struct tomoyo_number_union *ptr) | |
114 | { | |
115 | if (ptr->is_group) | |
116 | return tomoyo_number_matches_group(value, value, ptr->group); | |
117 | return value >= ptr->values[0] && value <= ptr->values[1]; | |
118 | } | |
119 | ||
c8c57e84 TH |
120 | static void tomoyo_add_slash(struct tomoyo_path_info *buf) |
121 | { | |
122 | if (buf->is_dir) | |
123 | return; | |
124 | /* | |
125 | * This is OK because tomoyo_encode() reserves space for appending "/". | |
126 | */ | |
127 | strcat((char *) buf->name, "/"); | |
128 | tomoyo_fill_path_info(buf); | |
129 | } | |
130 | ||
b69a54ee KT |
131 | /** |
132 | * tomoyo_strendswith - Check whether the token ends with the given token. | |
133 | * | |
134 | * @name: The token to check. | |
135 | * @tail: The token to find. | |
136 | * | |
137 | * Returns true if @name ends with @tail, false otherwise. | |
138 | */ | |
139 | static bool tomoyo_strendswith(const char *name, const char *tail) | |
140 | { | |
141 | int len; | |
142 | ||
143 | if (!name || !tail) | |
144 | return false; | |
145 | len = strlen(name) - strlen(tail); | |
146 | return len >= 0 && !strcmp(name + len, tail); | |
147 | } | |
148 | ||
149 | /** | |
c8c57e84 | 150 | * tomoyo_get_realpath - Get realpath. |
b69a54ee | 151 | * |
c8c57e84 | 152 | * @buf: Pointer to "struct tomoyo_path_info". |
b69a54ee KT |
153 | * @path: Pointer to "struct path". |
154 | * | |
c8c57e84 | 155 | * Returns true on success, false otherwise. |
b69a54ee | 156 | */ |
c8c57e84 | 157 | static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path) |
b69a54ee | 158 | { |
c8c57e84 TH |
159 | buf->name = tomoyo_realpath_from_path(path); |
160 | if (buf->name) { | |
161 | tomoyo_fill_path_info(buf); | |
162 | return true; | |
b69a54ee | 163 | } |
c8c57e84 | 164 | return false; |
b69a54ee KT |
165 | } |
166 | ||
99a85259 TH |
167 | /** |
168 | * tomoyo_audit_path_log - Audit path request log. | |
169 | * | |
170 | * @r: Pointer to "struct tomoyo_request_info". | |
171 | * | |
172 | * Returns 0 on success, negative value otherwise. | |
173 | */ | |
174 | static int tomoyo_audit_path_log(struct tomoyo_request_info *r) | |
175 | { | |
176 | const char *operation = tomoyo_path_keyword[r->param.path.operation]; | |
177 | const struct tomoyo_path_info *filename = r->param.path.filename; | |
178 | if (r->granted) | |
179 | return 0; | |
180 | tomoyo_warn_log(r, "%s %s", operation, filename->name); | |
181 | return tomoyo_supervisor(r, "allow_%s %s\n", operation, | |
182 | tomoyo_file_pattern(filename)); | |
183 | } | |
184 | ||
185 | /** | |
186 | * tomoyo_audit_path2_log - Audit path/path request log. | |
187 | * | |
188 | * @r: Pointer to "struct tomoyo_request_info". | |
189 | * | |
190 | * Returns 0 on success, negative value otherwise. | |
191 | */ | |
192 | static int tomoyo_audit_path2_log(struct tomoyo_request_info *r) | |
193 | { | |
194 | const char *operation = tomoyo_path2_keyword[r->param.path2.operation]; | |
195 | const struct tomoyo_path_info *filename1 = r->param.path2.filename1; | |
196 | const struct tomoyo_path_info *filename2 = r->param.path2.filename2; | |
197 | if (r->granted) | |
198 | return 0; | |
199 | tomoyo_warn_log(r, "%s %s %s", operation, filename1->name, | |
200 | filename2->name); | |
201 | return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, | |
202 | tomoyo_file_pattern(filename1), | |
203 | tomoyo_file_pattern(filename2)); | |
204 | } | |
205 | ||
206 | /** | |
207 | * tomoyo_audit_mkdev_log - Audit path/number/number/number request log. | |
208 | * | |
209 | * @r: Pointer to "struct tomoyo_request_info". | |
210 | * | |
211 | * Returns 0 on success, negative value otherwise. | |
212 | */ | |
213 | static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r) | |
214 | { | |
71c28236 | 215 | const char *operation = tomoyo_mkdev_keyword[r->param.mkdev.operation]; |
99a85259 TH |
216 | const struct tomoyo_path_info *filename = r->param.mkdev.filename; |
217 | const unsigned int major = r->param.mkdev.major; | |
218 | const unsigned int minor = r->param.mkdev.minor; | |
219 | const unsigned int mode = r->param.mkdev.mode; | |
220 | if (r->granted) | |
221 | return 0; | |
222 | tomoyo_warn_log(r, "%s %s 0%o %u %u", operation, filename->name, mode, | |
223 | major, minor); | |
224 | return tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", operation, | |
225 | tomoyo_file_pattern(filename), mode, major, | |
226 | minor); | |
227 | } | |
228 | ||
229 | /** | |
230 | * tomoyo_audit_path_number_log - Audit path/number request log. | |
231 | * | |
232 | * @r: Pointer to "struct tomoyo_request_info". | |
233 | * @error: Error code. | |
234 | * | |
235 | * Returns 0 on success, negative value otherwise. | |
236 | */ | |
237 | static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r) | |
238 | { | |
239 | const u8 type = r->param.path_number.operation; | |
240 | u8 radix; | |
241 | const struct tomoyo_path_info *filename = r->param.path_number.filename; | |
242 | const char *operation = tomoyo_path_number_keyword[type]; | |
243 | char buffer[64]; | |
244 | if (r->granted) | |
245 | return 0; | |
246 | switch (type) { | |
247 | case TOMOYO_TYPE_CREATE: | |
248 | case TOMOYO_TYPE_MKDIR: | |
249 | case TOMOYO_TYPE_MKFIFO: | |
250 | case TOMOYO_TYPE_MKSOCK: | |
251 | case TOMOYO_TYPE_CHMOD: | |
252 | radix = TOMOYO_VALUE_TYPE_OCTAL; | |
253 | break; | |
254 | case TOMOYO_TYPE_IOCTL: | |
255 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
256 | break; | |
257 | default: | |
258 | radix = TOMOYO_VALUE_TYPE_DECIMAL; | |
259 | break; | |
260 | } | |
261 | tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number, | |
262 | radix); | |
263 | tomoyo_warn_log(r, "%s %s %s", operation, filename->name, buffer); | |
264 | return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, | |
265 | tomoyo_file_pattern(filename), buffer); | |
266 | } | |
267 | ||
36f5e1ff TH |
268 | static bool tomoyo_same_globally_readable(const struct tomoyo_acl_head *a, |
269 | const struct tomoyo_acl_head *b) | |
270 | { | |
271 | return container_of(a, struct tomoyo_globally_readable_file_entry, | |
272 | head)->filename == | |
273 | container_of(b, struct tomoyo_globally_readable_file_entry, | |
274 | head)->filename; | |
275 | } | |
276 | ||
b69a54ee KT |
277 | /** |
278 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
279 | * | |
280 | * @filename: Filename unconditionally permitted to open() for reading. | |
281 | * @is_delete: True if it is a delete request. | |
282 | * | |
283 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
284 | * |
285 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
286 | */ |
287 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
288 | const bool is_delete) | |
289 | { | |
9e4b50e9 | 290 | struct tomoyo_globally_readable_file_entry e = { }; |
36f5e1ff | 291 | int error; |
b69a54ee | 292 | |
75093152 | 293 | if (!tomoyo_correct_word(filename)) |
b69a54ee | 294 | return -EINVAL; |
9e4b50e9 TH |
295 | e.filename = tomoyo_get_name(filename); |
296 | if (!e.filename) | |
b69a54ee | 297 | return -ENOMEM; |
36f5e1ff | 298 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
a230f9e7 TH |
299 | &tomoyo_policy_list |
300 | [TOMOYO_ID_GLOBALLY_READABLE], | |
36f5e1ff | 301 | tomoyo_same_globally_readable); |
9e4b50e9 | 302 | tomoyo_put_name(e.filename); |
b69a54ee KT |
303 | return error; |
304 | } | |
305 | ||
306 | /** | |
75093152 | 307 | * tomoyo_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. |
b69a54ee KT |
308 | * |
309 | * @filename: The filename to check. | |
310 | * | |
311 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
312 | * |
313 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 314 | */ |
75093152 | 315 | static bool tomoyo_globally_readable_file(const struct tomoyo_path_info * |
b69a54ee KT |
316 | filename) |
317 | { | |
318 | struct tomoyo_globally_readable_file_entry *ptr; | |
319 | bool found = false; | |
fdb8ebb7 | 320 | |
a230f9e7 TH |
321 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list |
322 | [TOMOYO_ID_GLOBALLY_READABLE], head.list) { | |
82e0f001 | 323 | if (!ptr->head.is_deleted && |
b69a54ee KT |
324 | tomoyo_path_matches_pattern(filename, ptr->filename)) { |
325 | found = true; | |
326 | break; | |
327 | } | |
328 | } | |
b69a54ee KT |
329 | return found; |
330 | } | |
331 | ||
332 | /** | |
333 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
334 | * | |
335 | * @data: String to parse. | |
336 | * @is_delete: True if it is a delete request. | |
337 | * | |
338 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
339 | * |
340 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
341 | */ |
342 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
343 | { | |
344 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
345 | } | |
346 | ||
36f5e1ff TH |
347 | static bool tomoyo_same_pattern(const struct tomoyo_acl_head *a, |
348 | const struct tomoyo_acl_head *b) | |
349 | { | |
350 | return container_of(a, struct tomoyo_pattern_entry, head)->pattern == | |
351 | container_of(b, struct tomoyo_pattern_entry, head)->pattern; | |
352 | } | |
353 | ||
b69a54ee KT |
354 | /** |
355 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
356 | * | |
357 | * @pattern: Pathname pattern. | |
358 | * @is_delete: True if it is a delete request. | |
359 | * | |
360 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
361 | * |
362 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
363 | */ |
364 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
365 | const bool is_delete) | |
366 | { | |
3f629636 | 367 | struct tomoyo_pattern_entry e = { }; |
36f5e1ff | 368 | int error; |
b69a54ee | 369 | |
75093152 | 370 | if (!tomoyo_correct_word(pattern)) |
3f629636 TH |
371 | return -EINVAL; |
372 | e.pattern = tomoyo_get_name(pattern); | |
9e4b50e9 | 373 | if (!e.pattern) |
36f5e1ff TH |
374 | return -ENOMEM; |
375 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
a230f9e7 | 376 | &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
36f5e1ff | 377 | tomoyo_same_pattern); |
9e4b50e9 | 378 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
379 | return error; |
380 | } | |
381 | ||
382 | /** | |
17fcfbd9 | 383 | * tomoyo_file_pattern - Get patterned pathname. |
b69a54ee KT |
384 | * |
385 | * @filename: The filename to find patterned pathname. | |
386 | * | |
387 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
388 | * |
389 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 390 | */ |
17fcfbd9 | 391 | const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename) |
b69a54ee KT |
392 | { |
393 | struct tomoyo_pattern_entry *ptr; | |
394 | const struct tomoyo_path_info *pattern = NULL; | |
395 | ||
a230f9e7 TH |
396 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
397 | head.list) { | |
82e0f001 | 398 | if (ptr->head.is_deleted) |
b69a54ee KT |
399 | continue; |
400 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
401 | continue; | |
402 | pattern = ptr->pattern; | |
403 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
404 | /* Do nothing. Try to find the better match. */ | |
405 | } else { | |
406 | /* This would be the better match. Use this. */ | |
407 | break; | |
408 | } | |
409 | } | |
b69a54ee KT |
410 | if (pattern) |
411 | filename = pattern; | |
17fcfbd9 | 412 | return filename->name; |
b69a54ee KT |
413 | } |
414 | ||
415 | /** | |
416 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
417 | * | |
418 | * @data: String to parse. | |
419 | * @is_delete: True if it is a delete request. | |
420 | * | |
421 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
422 | * |
423 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
424 | */ |
425 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
426 | { | |
427 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
428 | } | |
429 | ||
36f5e1ff TH |
430 | static bool tomoyo_same_no_rewrite(const struct tomoyo_acl_head *a, |
431 | const struct tomoyo_acl_head *b) | |
432 | { | |
433 | return container_of(a, struct tomoyo_no_rewrite_entry, head)->pattern | |
434 | == container_of(b, struct tomoyo_no_rewrite_entry, head) | |
435 | ->pattern; | |
436 | } | |
437 | ||
b69a54ee KT |
438 | /** |
439 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
440 | * | |
441 | * @pattern: Pathname pattern that are not rewritable by default. | |
442 | * @is_delete: True if it is a delete request. | |
443 | * | |
444 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
445 | * |
446 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
447 | */ |
448 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
449 | const bool is_delete) | |
450 | { | |
9e4b50e9 | 451 | struct tomoyo_no_rewrite_entry e = { }; |
36f5e1ff | 452 | int error; |
b69a54ee | 453 | |
75093152 | 454 | if (!tomoyo_correct_word(pattern)) |
b69a54ee | 455 | return -EINVAL; |
9e4b50e9 TH |
456 | e.pattern = tomoyo_get_name(pattern); |
457 | if (!e.pattern) | |
36f5e1ff TH |
458 | return -ENOMEM; |
459 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
a230f9e7 | 460 | &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
36f5e1ff | 461 | tomoyo_same_no_rewrite); |
9e4b50e9 | 462 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
463 | return error; |
464 | } | |
465 | ||
466 | /** | |
75093152 | 467 | * tomoyo_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. |
b69a54ee KT |
468 | * |
469 | * @filename: Filename to check. | |
470 | * | |
471 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
472 | * false otherwise. | |
fdb8ebb7 TH |
473 | * |
474 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 475 | */ |
75093152 | 476 | static bool tomoyo_no_rewrite_file(const struct tomoyo_path_info *filename) |
b69a54ee KT |
477 | { |
478 | struct tomoyo_no_rewrite_entry *ptr; | |
479 | bool found = false; | |
480 | ||
a230f9e7 TH |
481 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
482 | head.list) { | |
82e0f001 | 483 | if (ptr->head.is_deleted) |
b69a54ee KT |
484 | continue; |
485 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
486 | continue; | |
487 | found = true; | |
488 | break; | |
489 | } | |
b69a54ee KT |
490 | return found; |
491 | } | |
492 | ||
493 | /** | |
494 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
495 | * | |
496 | * @data: String to parse. | |
497 | * @is_delete: True if it is a delete request. | |
498 | * | |
499 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
500 | * |
501 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
502 | */ |
503 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
504 | { | |
505 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
506 | } | |
507 | ||
99a85259 TH |
508 | static bool tomoyo_check_path_acl(const struct tomoyo_request_info *r, |
509 | const struct tomoyo_acl_info *ptr) | |
b69a54ee | 510 | { |
99a85259 TH |
511 | const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl), |
512 | head); | |
513 | return (acl->perm & (1 << r->param.path.operation)) && | |
514 | tomoyo_compare_name_union(r->param.path.filename, &acl->name); | |
515 | } | |
b69a54ee | 516 | |
99a85259 TH |
517 | static bool tomoyo_check_path_number_acl(const struct tomoyo_request_info *r, |
518 | const struct tomoyo_acl_info *ptr) | |
519 | { | |
520 | const struct tomoyo_path_number_acl *acl = | |
521 | container_of(ptr, typeof(*acl), head); | |
522 | return (acl->perm & (1 << r->param.path_number.operation)) && | |
523 | tomoyo_compare_number_union(r->param.path_number.number, | |
524 | &acl->number) && | |
525 | tomoyo_compare_name_union(r->param.path_number.filename, | |
526 | &acl->name); | |
527 | } | |
528 | ||
529 | static bool tomoyo_check_path2_acl(const struct tomoyo_request_info *r, | |
530 | const struct tomoyo_acl_info *ptr) | |
531 | { | |
532 | const struct tomoyo_path2_acl *acl = | |
533 | container_of(ptr, typeof(*acl), head); | |
534 | return (acl->perm & (1 << r->param.path2.operation)) && | |
535 | tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1) | |
536 | && tomoyo_compare_name_union(r->param.path2.filename2, | |
537 | &acl->name2); | |
538 | } | |
539 | ||
540 | static bool tomoyo_check_mkdev_acl(const struct tomoyo_request_info *r, | |
541 | const struct tomoyo_acl_info *ptr) | |
542 | { | |
75093152 | 543 | const struct tomoyo_mkdev_acl *acl = |
99a85259 TH |
544 | container_of(ptr, typeof(*acl), head); |
545 | return (acl->perm & (1 << r->param.mkdev.operation)) && | |
546 | tomoyo_compare_number_union(r->param.mkdev.mode, | |
547 | &acl->mode) && | |
548 | tomoyo_compare_number_union(r->param.mkdev.major, | |
549 | &acl->major) && | |
550 | tomoyo_compare_number_union(r->param.mkdev.minor, | |
551 | &acl->minor) && | |
552 | tomoyo_compare_name_union(r->param.mkdev.filename, | |
553 | &acl->name); | |
b69a54ee KT |
554 | } |
555 | ||
237ab459 TH |
556 | static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, |
557 | const struct tomoyo_acl_info *b) | |
558 | { | |
559 | const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); | |
560 | const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
561 | return tomoyo_same_acl_head(&p1->head, &p2->head) && |
562 | tomoyo_same_name_union(&p1->name, &p2->name); | |
237ab459 TH |
563 | } |
564 | ||
565 | static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, | |
566 | struct tomoyo_acl_info *b, | |
567 | const bool is_delete) | |
568 | { | |
569 | u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head) | |
570 | ->perm; | |
571 | u16 perm = *a_perm; | |
572 | const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; | |
573 | if (is_delete) { | |
574 | perm &= ~b_perm; | |
575 | if ((perm & TOMOYO_RW_MASK) != TOMOYO_RW_MASK) | |
576 | perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); | |
577 | else if (!(perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
578 | perm &= ~TOMOYO_RW_MASK; | |
579 | } else { | |
580 | perm |= b_perm; | |
581 | if ((perm & TOMOYO_RW_MASK) == TOMOYO_RW_MASK) | |
582 | perm |= (1 << TOMOYO_TYPE_READ_WRITE); | |
583 | else if (perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
584 | perm |= TOMOYO_RW_MASK; | |
585 | } | |
586 | *a_perm = perm; | |
587 | return !perm; | |
588 | } | |
589 | ||
b69a54ee | 590 | /** |
7ef61233 | 591 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
592 | * |
593 | * @type: Type of operation. | |
594 | * @filename: Filename. | |
595 | * @domain: Pointer to "struct tomoyo_domain_info". | |
596 | * @is_delete: True if it is a delete request. | |
597 | * | |
598 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
599 | * |
600 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 601 | */ |
7ef61233 | 602 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
237ab459 | 603 | struct tomoyo_domain_info * const domain, |
7ef61233 | 604 | const bool is_delete) |
b69a54ee | 605 | { |
9e4b50e9 TH |
606 | struct tomoyo_path_acl e = { |
607 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
237ab459 | 608 | .perm = 1 << type |
9e4b50e9 | 609 | }; |
237ab459 TH |
610 | int error; |
611 | if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE)) | |
612 | e.perm |= TOMOYO_RW_MASK; | |
7762fbff | 613 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 614 | return -EINVAL; |
237ab459 TH |
615 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
616 | tomoyo_same_path_acl, | |
617 | tomoyo_merge_path_acl); | |
7762fbff | 618 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
619 | return error; |
620 | } | |
621 | ||
75093152 | 622 | static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a, |
237ab459 TH |
623 | const struct tomoyo_acl_info *b) |
624 | { | |
75093152 | 625 | const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), |
237ab459 | 626 | head); |
75093152 | 627 | const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), |
237ab459 | 628 | head); |
75093152 TH |
629 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
630 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
631 | && tomoyo_same_number_union(&p1->mode, &p2->mode) | |
632 | && tomoyo_same_number_union(&p1->major, &p2->major) | |
633 | && tomoyo_same_number_union(&p1->minor, &p2->minor); | |
237ab459 TH |
634 | } |
635 | ||
75093152 | 636 | static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, |
237ab459 TH |
637 | struct tomoyo_acl_info *b, |
638 | const bool is_delete) | |
639 | { | |
75093152 | 640 | u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl, |
237ab459 TH |
641 | head)->perm; |
642 | u8 perm = *a_perm; | |
75093152 | 643 | const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head) |
237ab459 TH |
644 | ->perm; |
645 | if (is_delete) | |
646 | perm &= ~b_perm; | |
647 | else | |
648 | perm |= b_perm; | |
649 | *a_perm = perm; | |
650 | return !perm; | |
651 | } | |
652 | ||
a1f9bb6a | 653 | /** |
75093152 | 654 | * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list. |
a1f9bb6a TH |
655 | * |
656 | * @type: Type of operation. | |
657 | * @filename: Filename. | |
658 | * @mode: Create mode. | |
659 | * @major: Device major number. | |
660 | * @minor: Device minor number. | |
661 | * @domain: Pointer to "struct tomoyo_domain_info". | |
662 | * @is_delete: True if it is a delete request. | |
663 | * | |
664 | * Returns 0 on success, negative value otherwise. | |
237ab459 TH |
665 | * |
666 | * Caller holds tomoyo_read_lock(). | |
a1f9bb6a | 667 | */ |
75093152 | 668 | static int tomoyo_update_mkdev_acl(const u8 type, const char *filename, |
237ab459 TH |
669 | char *mode, char *major, char *minor, |
670 | struct tomoyo_domain_info * const | |
671 | domain, const bool is_delete) | |
a1f9bb6a | 672 | { |
75093152 TH |
673 | struct tomoyo_mkdev_acl e = { |
674 | .head.type = TOMOYO_TYPE_MKDEV_ACL, | |
237ab459 | 675 | .perm = 1 << type |
a1f9bb6a TH |
676 | }; |
677 | int error = is_delete ? -ENOENT : -ENOMEM; | |
678 | if (!tomoyo_parse_name_union(filename, &e.name) || | |
679 | !tomoyo_parse_number_union(mode, &e.mode) || | |
680 | !tomoyo_parse_number_union(major, &e.major) || | |
681 | !tomoyo_parse_number_union(minor, &e.minor)) | |
682 | goto out; | |
237ab459 | 683 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
75093152 TH |
684 | tomoyo_same_mkdev_acl, |
685 | tomoyo_merge_mkdev_acl); | |
a1f9bb6a TH |
686 | out: |
687 | tomoyo_put_name_union(&e.name); | |
688 | tomoyo_put_number_union(&e.mode); | |
689 | tomoyo_put_number_union(&e.major); | |
690 | tomoyo_put_number_union(&e.minor); | |
691 | return error; | |
692 | } | |
693 | ||
237ab459 TH |
694 | static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, |
695 | const struct tomoyo_acl_info *b) | |
696 | { | |
697 | const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); | |
698 | const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
699 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
700 | && tomoyo_same_name_union(&p1->name1, &p2->name1) | |
701 | && tomoyo_same_name_union(&p1->name2, &p2->name2); | |
237ab459 TH |
702 | } |
703 | ||
704 | static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a, | |
705 | struct tomoyo_acl_info *b, | |
706 | const bool is_delete) | |
707 | { | |
708 | u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head) | |
709 | ->perm; | |
710 | u8 perm = *a_perm; | |
711 | const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm; | |
712 | if (is_delete) | |
713 | perm &= ~b_perm; | |
714 | else | |
715 | perm |= b_perm; | |
716 | *a_perm = perm; | |
717 | return !perm; | |
718 | } | |
719 | ||
b69a54ee | 720 | /** |
7ef61233 | 721 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
722 | * |
723 | * @type: Type of operation. | |
724 | * @filename1: First filename. | |
725 | * @filename2: Second filename. | |
726 | * @domain: Pointer to "struct tomoyo_domain_info". | |
727 | * @is_delete: True if it is a delete request. | |
728 | * | |
729 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
730 | * |
731 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 732 | */ |
7ef61233 TH |
733 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
734 | const char *filename2, | |
237ab459 | 735 | struct tomoyo_domain_info * const domain, |
7ef61233 | 736 | const bool is_delete) |
b69a54ee | 737 | { |
9e4b50e9 TH |
738 | struct tomoyo_path2_acl e = { |
739 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
237ab459 | 740 | .perm = 1 << type |
9e4b50e9 | 741 | }; |
ca0b7df3 | 742 | int error = is_delete ? -ENOENT : -ENOMEM; |
7762fbff TH |
743 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
744 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 745 | goto out; |
237ab459 TH |
746 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
747 | tomoyo_same_path2_acl, | |
748 | tomoyo_merge_path2_acl); | |
ca0b7df3 | 749 | out: |
7762fbff TH |
750 | tomoyo_put_name_union(&e.name1); |
751 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
752 | return error; |
753 | } | |
754 | ||
b69a54ee | 755 | /** |
cb0abe6a | 756 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 757 | * |
cb0abe6a | 758 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
759 | * @operation: Type of operation. |
760 | * @filename: Filename to check. | |
b69a54ee KT |
761 | * |
762 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
763 | * |
764 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 765 | */ |
05336dee TH |
766 | int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
767 | const struct tomoyo_path_info *filename) | |
b69a54ee | 768 | { |
b69a54ee | 769 | int error; |
b69a54ee | 770 | |
b69a54ee | 771 | next: |
57c2590f TH |
772 | r->type = tomoyo_p2mac[operation]; |
773 | r->mode = tomoyo_get_mode(r->profile, r->type); | |
774 | if (r->mode == TOMOYO_CONFIG_DISABLED) | |
775 | return 0; | |
cf6e9a64 TH |
776 | r->param_type = TOMOYO_TYPE_PATH_ACL; |
777 | r->param.path.filename = filename; | |
778 | r->param.path.operation = operation; | |
17fcfbd9 | 779 | do { |
99a85259 TH |
780 | tomoyo_check_acl(r, tomoyo_check_path_acl); |
781 | if (!r->granted && operation == TOMOYO_TYPE_READ && | |
05336dee | 782 | !r->domain->ignore_global_allow_read && |
75093152 | 783 | tomoyo_globally_readable_file(filename)) |
99a85259 TH |
784 | r->granted = true; |
785 | error = tomoyo_audit_path_log(r); | |
05336dee TH |
786 | /* |
787 | * Do not retry for execute request, for alias may have | |
788 | * changed. | |
789 | */ | |
790 | } while (error == TOMOYO_RETRY_REQUEST && | |
791 | operation != TOMOYO_TYPE_EXECUTE); | |
b69a54ee KT |
792 | /* |
793 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
794 | * we need to check "allow_rewrite" permission if the filename is | |
795 | * specified by "deny_rewrite" keyword. | |
796 | */ | |
7ef61233 | 797 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
75093152 | 798 | tomoyo_no_rewrite_file(filename)) { |
7ef61233 | 799 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
800 | goto next; |
801 | } | |
802 | return error; | |
803 | } | |
804 | ||
237ab459 TH |
805 | static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, |
806 | const struct tomoyo_acl_info *b) | |
807 | { | |
808 | const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1), | |
809 | head); | |
810 | const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), | |
811 | head); | |
75093152 TH |
812 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
813 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
814 | && tomoyo_same_number_union(&p1->number, &p2->number); | |
237ab459 TH |
815 | } |
816 | ||
817 | static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, | |
818 | struct tomoyo_acl_info *b, | |
819 | const bool is_delete) | |
820 | { | |
821 | u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl, | |
822 | head)->perm; | |
823 | u8 perm = *a_perm; | |
824 | const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head) | |
825 | ->perm; | |
826 | if (is_delete) | |
827 | perm &= ~b_perm; | |
828 | else | |
829 | perm |= b_perm; | |
830 | *a_perm = perm; | |
831 | return !perm; | |
832 | } | |
833 | ||
a1f9bb6a TH |
834 | /** |
835 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. | |
836 | * | |
837 | * @type: Type of operation. | |
838 | * @filename: Filename. | |
839 | * @number: Number. | |
840 | * @domain: Pointer to "struct tomoyo_domain_info". | |
841 | * @is_delete: True if it is a delete request. | |
842 | * | |
843 | * Returns 0 on success, negative value otherwise. | |
844 | */ | |
237ab459 TH |
845 | static int tomoyo_update_path_number_acl(const u8 type, const char *filename, |
846 | char *number, | |
847 | struct tomoyo_domain_info * const | |
848 | domain, | |
849 | const bool is_delete) | |
a1f9bb6a | 850 | { |
a1f9bb6a TH |
851 | struct tomoyo_path_number_acl e = { |
852 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
237ab459 | 853 | .perm = 1 << type |
a1f9bb6a TH |
854 | }; |
855 | int error = is_delete ? -ENOENT : -ENOMEM; | |
a1f9bb6a TH |
856 | if (!tomoyo_parse_name_union(filename, &e.name)) |
857 | return -EINVAL; | |
858 | if (!tomoyo_parse_number_union(number, &e.number)) | |
859 | goto out; | |
237ab459 TH |
860 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
861 | tomoyo_same_path_number_acl, | |
862 | tomoyo_merge_path_number_acl); | |
a1f9bb6a TH |
863 | out: |
864 | tomoyo_put_name_union(&e.name); | |
865 | tomoyo_put_number_union(&e.number); | |
866 | return error; | |
867 | } | |
868 | ||
a1f9bb6a TH |
869 | /** |
870 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
871 | * | |
872 | * @type: Type of operation. | |
873 | * @path: Pointer to "struct path". | |
874 | * @number: Number. | |
875 | * | |
876 | * Returns 0 on success, negative value otherwise. | |
877 | */ | |
878 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
879 | unsigned long number) | |
880 | { | |
881 | struct tomoyo_request_info r; | |
882 | int error = -ENOMEM; | |
c8c57e84 | 883 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
884 | int idx; |
885 | ||
57c2590f TH |
886 | if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
887 | == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) | |
a1f9bb6a TH |
888 | return 0; |
889 | idx = tomoyo_read_lock(); | |
c8c57e84 | 890 | if (!tomoyo_get_realpath(&buf, path)) |
a1f9bb6a | 891 | goto out; |
c8c57e84 TH |
892 | if (type == TOMOYO_TYPE_MKDIR) |
893 | tomoyo_add_slash(&buf); | |
cb917cf5 TH |
894 | r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL; |
895 | r.param.path_number.operation = type; | |
896 | r.param.path_number.filename = &buf; | |
897 | r.param.path_number.number = number; | |
898 | do { | |
899 | tomoyo_check_acl(&r, tomoyo_check_path_number_acl); | |
900 | error = tomoyo_audit_path_number_log(&r); | |
901 | } while (error == TOMOYO_RETRY_REQUEST); | |
c8c57e84 | 902 | kfree(buf.name); |
cb917cf5 | 903 | out: |
a1f9bb6a TH |
904 | tomoyo_read_unlock(idx); |
905 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
906 | error = 0; | |
907 | return error; | |
908 | } | |
909 | ||
b69a54ee KT |
910 | /** |
911 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
912 | * | |
913 | * @domain: Pointer to "struct tomoyo_domain_info". | |
914 | * @path: Pointer to "struct path". | |
915 | * @flag: Flags for open(). | |
916 | * | |
917 | * Returns 0 on success, negative value otherwise. | |
918 | */ | |
919 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
920 | struct path *path, const int flag) | |
921 | { | |
922 | const u8 acc_mode = ACC_MODE(flag); | |
923 | int error = -ENOMEM; | |
c8c57e84 | 924 | struct tomoyo_path_info buf; |
cb0abe6a | 925 | struct tomoyo_request_info r; |
fdb8ebb7 | 926 | int idx; |
b69a54ee | 927 | |
57c2590f TH |
928 | if (!path->mnt || |
929 | (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))) | |
b69a54ee | 930 | return 0; |
57c2590f TH |
931 | buf.name = NULL; |
932 | r.mode = TOMOYO_CONFIG_DISABLED; | |
fdb8ebb7 | 933 | idx = tomoyo_read_lock(); |
c8c57e84 | 934 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
935 | goto out; |
936 | error = 0; | |
937 | /* | |
938 | * If the filename is specified by "deny_rewrite" keyword, | |
939 | * we need to check "allow_rewrite" permission when the filename is not | |
940 | * opened for append mode or the filename is truncated at open time. | |
941 | */ | |
57c2590f TH |
942 | if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND) |
943 | && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE) | |
944 | != TOMOYO_CONFIG_DISABLED) { | |
945 | if (!tomoyo_get_realpath(&buf, path)) { | |
946 | error = -ENOMEM; | |
947 | goto out; | |
948 | } | |
75093152 | 949 | if (tomoyo_no_rewrite_file(&buf)) |
57c2590f TH |
950 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, |
951 | &buf); | |
b69a54ee | 952 | } |
57c2590f TH |
953 | if (!error && acc_mode && |
954 | tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) | |
955 | != TOMOYO_CONFIG_DISABLED) { | |
05336dee | 956 | u8 operation; |
57c2590f TH |
957 | if (!buf.name && !tomoyo_get_realpath(&buf, path)) { |
958 | error = -ENOMEM; | |
959 | goto out; | |
960 | } | |
05336dee TH |
961 | if (acc_mode == (MAY_READ | MAY_WRITE)) |
962 | operation = TOMOYO_TYPE_READ_WRITE; | |
963 | else if (acc_mode == MAY_READ) | |
964 | operation = TOMOYO_TYPE_READ; | |
965 | else | |
966 | operation = TOMOYO_TYPE_WRITE; | |
967 | error = tomoyo_path_permission(&r, operation, &buf); | |
57c2590f | 968 | } |
b69a54ee | 969 | out: |
c8c57e84 | 970 | kfree(buf.name); |
fdb8ebb7 | 971 | tomoyo_read_unlock(idx); |
cb0abe6a | 972 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
973 | error = 0; |
974 | return error; | |
975 | } | |
976 | ||
977 | /** | |
2106ccd9 | 978 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
b69a54ee | 979 | * |
b69a54ee KT |
980 | * @operation: Type of operation. |
981 | * @path: Pointer to "struct path". | |
982 | * | |
983 | * Returns 0 on success, negative value otherwise. | |
984 | */ | |
97d6931e | 985 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
986 | { |
987 | int error = -ENOMEM; | |
c8c57e84 | 988 | struct tomoyo_path_info buf; |
cb0abe6a | 989 | struct tomoyo_request_info r; |
fdb8ebb7 | 990 | int idx; |
b69a54ee | 991 | |
57c2590f TH |
992 | if (!path->mnt) |
993 | return 0; | |
994 | if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) | |
995 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 996 | return 0; |
57c2590f | 997 | buf.name = NULL; |
fdb8ebb7 | 998 | idx = tomoyo_read_lock(); |
c8c57e84 | 999 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1000 | goto out; |
1001 | switch (operation) { | |
cb0abe6a | 1002 | case TOMOYO_TYPE_REWRITE: |
75093152 | 1003 | if (!tomoyo_no_rewrite_file(&buf)) { |
cb0abe6a TH |
1004 | error = 0; |
1005 | goto out; | |
1006 | } | |
1007 | break; | |
7ef61233 TH |
1008 | case TOMOYO_TYPE_RMDIR: |
1009 | case TOMOYO_TYPE_CHROOT: | |
57c2590f | 1010 | case TOMOYO_TYPE_UMOUNT: |
c8c57e84 TH |
1011 | tomoyo_add_slash(&buf); |
1012 | break; | |
b69a54ee | 1013 | } |
c8c57e84 | 1014 | error = tomoyo_path_permission(&r, operation, &buf); |
b69a54ee | 1015 | out: |
c8c57e84 | 1016 | kfree(buf.name); |
fdb8ebb7 | 1017 | tomoyo_read_unlock(idx); |
cb0abe6a | 1018 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1019 | error = 0; |
1020 | return error; | |
1021 | } | |
1022 | ||
a1f9bb6a | 1023 | /** |
75093152 | 1024 | * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar". |
a1f9bb6a TH |
1025 | * |
1026 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
1027 | * @path: Pointer to "struct path". | |
1028 | * @mode: Create mode. | |
1029 | * @dev: Device number. | |
1030 | * | |
1031 | * Returns 0 on success, negative value otherwise. | |
1032 | */ | |
75093152 | 1033 | int tomoyo_mkdev_perm(const u8 operation, struct path *path, |
a1f9bb6a TH |
1034 | const unsigned int mode, unsigned int dev) |
1035 | { | |
1036 | struct tomoyo_request_info r; | |
1037 | int error = -ENOMEM; | |
c8c57e84 | 1038 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1039 | int idx; |
1040 | ||
57c2590f TH |
1041 | if (!path->mnt || |
1042 | tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) | |
1043 | == TOMOYO_CONFIG_DISABLED) | |
a1f9bb6a TH |
1044 | return 0; |
1045 | idx = tomoyo_read_lock(); | |
1046 | error = -ENOMEM; | |
c8c57e84 | 1047 | if (tomoyo_get_realpath(&buf, path)) { |
cf6e9a64 | 1048 | dev = new_decode_dev(dev); |
75093152 | 1049 | r.param_type = TOMOYO_TYPE_MKDEV_ACL; |
cf6e9a64 TH |
1050 | r.param.mkdev.filename = &buf; |
1051 | r.param.mkdev.operation = operation; | |
1052 | r.param.mkdev.mode = mode; | |
1053 | r.param.mkdev.major = MAJOR(dev); | |
1054 | r.param.mkdev.minor = MINOR(dev); | |
99a85259 TH |
1055 | tomoyo_check_acl(&r, tomoyo_check_mkdev_acl); |
1056 | error = tomoyo_audit_mkdev_log(&r); | |
c8c57e84 | 1057 | kfree(buf.name); |
a1f9bb6a TH |
1058 | } |
1059 | tomoyo_read_unlock(idx); | |
1060 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1061 | error = 0; | |
1062 | return error; | |
1063 | } | |
1064 | ||
b69a54ee | 1065 | /** |
7ef61233 | 1066 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1067 | * |
b69a54ee KT |
1068 | * @operation: Type of operation. |
1069 | * @path1: Pointer to "struct path". | |
1070 | * @path2: Pointer to "struct path". | |
1071 | * | |
1072 | * Returns 0 on success, negative value otherwise. | |
1073 | */ | |
97d6931e | 1074 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1075 | struct path *path2) |
b69a54ee KT |
1076 | { |
1077 | int error = -ENOMEM; | |
c8c57e84 TH |
1078 | struct tomoyo_path_info buf1; |
1079 | struct tomoyo_path_info buf2; | |
cb0abe6a | 1080 | struct tomoyo_request_info r; |
fdb8ebb7 | 1081 | int idx; |
b69a54ee | 1082 | |
57c2590f TH |
1083 | if (!path1->mnt || !path2->mnt || |
1084 | tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) | |
1085 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1086 | return 0; |
c8c57e84 TH |
1087 | buf1.name = NULL; |
1088 | buf2.name = NULL; | |
fdb8ebb7 | 1089 | idx = tomoyo_read_lock(); |
c8c57e84 TH |
1090 | if (!tomoyo_get_realpath(&buf1, path1) || |
1091 | !tomoyo_get_realpath(&buf2, path2)) | |
b69a54ee | 1092 | goto out; |
57c2590f TH |
1093 | switch (operation) { |
1094 | struct dentry *dentry; | |
1095 | case TOMOYO_TYPE_RENAME: | |
1096 | case TOMOYO_TYPE_LINK: | |
1097 | dentry = path1->dentry; | |
1098 | if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) | |
1099 | break; | |
1100 | /* fall through */ | |
1101 | case TOMOYO_TYPE_PIVOT_ROOT: | |
1102 | tomoyo_add_slash(&buf1); | |
1103 | tomoyo_add_slash(&buf2); | |
1104 | break; | |
1105 | } | |
cf6e9a64 TH |
1106 | r.param_type = TOMOYO_TYPE_PATH2_ACL; |
1107 | r.param.path2.operation = operation; | |
1108 | r.param.path2.filename1 = &buf1; | |
1109 | r.param.path2.filename2 = &buf2; | |
17fcfbd9 | 1110 | do { |
99a85259 TH |
1111 | tomoyo_check_acl(&r, tomoyo_check_path2_acl); |
1112 | error = tomoyo_audit_path2_log(&r); | |
1113 | } while (error == TOMOYO_RETRY_REQUEST); | |
b69a54ee | 1114 | out: |
c8c57e84 TH |
1115 | kfree(buf1.name); |
1116 | kfree(buf2.name); | |
fdb8ebb7 | 1117 | tomoyo_read_unlock(idx); |
cb0abe6a | 1118 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1119 | error = 0; |
1120 | return error; | |
1121 | } | |
a1f9bb6a TH |
1122 | |
1123 | /** | |
1124 | * tomoyo_write_file_policy - Update file related list. | |
1125 | * | |
1126 | * @data: String to parse. | |
1127 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1128 | * @is_delete: True if it is a delete request. | |
1129 | * | |
1130 | * Returns 0 on success, negative value otherwise. | |
1131 | * | |
1132 | * Caller holds tomoyo_read_lock(). | |
1133 | */ | |
1134 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
1135 | const bool is_delete) | |
1136 | { | |
1137 | char *w[5]; | |
1138 | u8 type; | |
1139 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
1140 | return -EINVAL; | |
237ab459 | 1141 | if (strncmp(w[0], "allow_", 6)) |
a1f9bb6a | 1142 | goto out; |
a1f9bb6a TH |
1143 | w[0] += 6; |
1144 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
1145 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
1146 | continue; | |
1147 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
1148 | } | |
1149 | if (!w[2][0]) | |
1150 | goto out; | |
1151 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
1152 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
1153 | continue; | |
1154 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
1155 | is_delete); | |
1156 | } | |
1157 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
1158 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
1159 | continue; | |
1160 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
1161 | is_delete); | |
1162 | } | |
1163 | if (!w[3][0] || !w[4][0]) | |
1164 | goto out; | |
75093152 TH |
1165 | for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) { |
1166 | if (strcmp(w[0], tomoyo_mkdev_keyword[type])) | |
a1f9bb6a | 1167 | continue; |
75093152 TH |
1168 | return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3], |
1169 | w[4], domain, is_delete); | |
a1f9bb6a TH |
1170 | } |
1171 | out: | |
1172 | return -EINVAL; | |
1173 | } |