Commit | Line | Data |
---|---|---|
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 | ||
484ca79c TH |
98 | const struct tomoyo_path_info * |
99 | tomoyo_compare_name_union(const struct tomoyo_path_info *name, | |
100 | const struct tomoyo_name_union *ptr) | |
7762fbff TH |
101 | { |
102 | if (ptr->is_group) | |
3f629636 | 103 | return tomoyo_path_matches_group(name, ptr->group); |
484ca79c TH |
104 | if (tomoyo_path_matches_pattern(name, ptr->filename)) |
105 | return ptr->filename; | |
106 | return NULL; | |
7762fbff TH |
107 | } |
108 | ||
4c3e9e2d TH |
109 | void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
110 | { | |
111 | if (ptr && ptr->is_group) | |
a98aa4de | 112 | tomoyo_put_group(ptr->group); |
4c3e9e2d TH |
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 | ||
c8c57e84 TH |
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 | ||
b69a54ee KT |
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 | /** | |
c8c57e84 | 153 | * tomoyo_get_realpath - Get realpath. |
b69a54ee | 154 | * |
c8c57e84 | 155 | * @buf: Pointer to "struct tomoyo_path_info". |
b69a54ee KT |
156 | * @path: Pointer to "struct path". |
157 | * | |
c8c57e84 | 158 | * Returns true on success, false otherwise. |
b69a54ee | 159 | */ |
c8c57e84 | 160 | static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path) |
b69a54ee | 161 | { |
c8c57e84 TH |
162 | buf->name = tomoyo_realpath_from_path(path); |
163 | if (buf->name) { | |
164 | tomoyo_fill_path_info(buf); | |
165 | return true; | |
b69a54ee | 166 | } |
c8c57e84 | 167 | return false; |
b69a54ee KT |
168 | } |
169 | ||
99a85259 TH |
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, | |
e2bf6907 | 185 | tomoyo_pattern(filename)); |
99a85259 TH |
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, | |
e2bf6907 TH |
205 | tomoyo_pattern(filename1), |
206 | tomoyo_pattern(filename2)); | |
99a85259 TH |
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 | { | |
71c28236 | 218 | const char *operation = tomoyo_mkdev_keyword[r->param.mkdev.operation]; |
99a85259 TH |
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, | |
e2bf6907 | 228 | tomoyo_pattern(filename), mode, major, minor); |
99a85259 TH |
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, | |
e2bf6907 | 267 | tomoyo_pattern(filename), buffer); |
99a85259 TH |
268 | } |
269 | ||
36f5e1ff TH |
270 | static bool tomoyo_same_globally_readable(const struct tomoyo_acl_head *a, |
271 | const struct tomoyo_acl_head *b) | |
272 | { | |
e2bf6907 | 273 | return container_of(a, struct tomoyo_readable_file, |
36f5e1ff | 274 | head)->filename == |
e2bf6907 | 275 | container_of(b, struct tomoyo_readable_file, |
36f5e1ff TH |
276 | head)->filename; |
277 | } | |
278 | ||
b69a54ee | 279 | /** |
e2bf6907 | 280 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_readable_file" list. |
b69a54ee KT |
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. | |
fdb8ebb7 TH |
286 | * |
287 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
288 | */ |
289 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
290 | const bool is_delete) | |
291 | { | |
e2bf6907 | 292 | struct tomoyo_readable_file e = { }; |
36f5e1ff | 293 | int error; |
b69a54ee | 294 | |
75093152 | 295 | if (!tomoyo_correct_word(filename)) |
b69a54ee | 296 | return -EINVAL; |
9e4b50e9 TH |
297 | e.filename = tomoyo_get_name(filename); |
298 | if (!e.filename) | |
b69a54ee | 299 | return -ENOMEM; |
36f5e1ff | 300 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
a230f9e7 TH |
301 | &tomoyo_policy_list |
302 | [TOMOYO_ID_GLOBALLY_READABLE], | |
36f5e1ff | 303 | tomoyo_same_globally_readable); |
9e4b50e9 | 304 | tomoyo_put_name(e.filename); |
b69a54ee KT |
305 | return error; |
306 | } | |
307 | ||
308 | /** | |
75093152 | 309 | * tomoyo_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. |
b69a54ee KT |
310 | * |
311 | * @filename: The filename to check. | |
312 | * | |
313 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
314 | * |
315 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 316 | */ |
75093152 | 317 | static bool tomoyo_globally_readable_file(const struct tomoyo_path_info * |
b69a54ee KT |
318 | filename) |
319 | { | |
e2bf6907 | 320 | struct tomoyo_readable_file *ptr; |
b69a54ee | 321 | bool found = false; |
fdb8ebb7 | 322 | |
a230f9e7 TH |
323 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list |
324 | [TOMOYO_ID_GLOBALLY_READABLE], head.list) { | |
82e0f001 | 325 | if (!ptr->head.is_deleted && |
b69a54ee KT |
326 | tomoyo_path_matches_pattern(filename, ptr->filename)) { |
327 | found = true; | |
328 | break; | |
329 | } | |
330 | } | |
b69a54ee KT |
331 | return found; |
332 | } | |
333 | ||
334 | /** | |
e2bf6907 | 335 | * tomoyo_write_globally_readable - Write "struct tomoyo_readable_file" list. |
b69a54ee KT |
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. | |
fdb8ebb7 TH |
341 | * |
342 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 343 | */ |
e2bf6907 | 344 | int tomoyo_write_globally_readable(char *data, const bool is_delete) |
b69a54ee KT |
345 | { |
346 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
347 | } | |
348 | ||
36f5e1ff TH |
349 | static bool tomoyo_same_pattern(const struct tomoyo_acl_head *a, |
350 | const struct tomoyo_acl_head *b) | |
351 | { | |
e2bf6907 TH |
352 | return container_of(a, struct tomoyo_no_pattern, head)->pattern == |
353 | container_of(b, struct tomoyo_no_pattern, head)->pattern; | |
36f5e1ff TH |
354 | } |
355 | ||
b69a54ee | 356 | /** |
e2bf6907 | 357 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_no_pattern" list. |
b69a54ee KT |
358 | * |
359 | * @pattern: Pathname pattern. | |
360 | * @is_delete: True if it is a delete request. | |
361 | * | |
362 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
363 | * |
364 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
365 | */ |
366 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
367 | const bool is_delete) | |
368 | { | |
e2bf6907 | 369 | struct tomoyo_no_pattern e = { }; |
36f5e1ff | 370 | int error; |
b69a54ee | 371 | |
75093152 | 372 | if (!tomoyo_correct_word(pattern)) |
3f629636 TH |
373 | return -EINVAL; |
374 | e.pattern = tomoyo_get_name(pattern); | |
9e4b50e9 | 375 | if (!e.pattern) |
36f5e1ff TH |
376 | return -ENOMEM; |
377 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
a230f9e7 | 378 | &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
36f5e1ff | 379 | tomoyo_same_pattern); |
9e4b50e9 | 380 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
381 | return error; |
382 | } | |
383 | ||
384 | /** | |
e2bf6907 | 385 | * tomoyo_pattern - Get patterned pathname. |
b69a54ee KT |
386 | * |
387 | * @filename: The filename to find patterned pathname. | |
388 | * | |
389 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
390 | * |
391 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 392 | */ |
e2bf6907 | 393 | const char *tomoyo_pattern(const struct tomoyo_path_info *filename) |
b69a54ee | 394 | { |
e2bf6907 | 395 | struct tomoyo_no_pattern *ptr; |
b69a54ee KT |
396 | const struct tomoyo_path_info *pattern = NULL; |
397 | ||
a230f9e7 TH |
398 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
399 | head.list) { | |
82e0f001 | 400 | if (ptr->head.is_deleted) |
b69a54ee KT |
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 | } | |
b69a54ee KT |
412 | if (pattern) |
413 | filename = pattern; | |
17fcfbd9 | 414 | return filename->name; |
b69a54ee KT |
415 | } |
416 | ||
417 | /** | |
e2bf6907 | 418 | * tomoyo_write_pattern - Write "struct tomoyo_no_pattern" list. |
b69a54ee KT |
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. | |
fdb8ebb7 TH |
424 | * |
425 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 426 | */ |
e2bf6907 | 427 | int tomoyo_write_pattern(char *data, const bool is_delete) |
b69a54ee KT |
428 | { |
429 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
430 | } | |
431 | ||
36f5e1ff TH |
432 | static bool tomoyo_same_no_rewrite(const struct tomoyo_acl_head *a, |
433 | const struct tomoyo_acl_head *b) | |
434 | { | |
e2bf6907 TH |
435 | return container_of(a, struct tomoyo_no_rewrite, head)->pattern |
436 | == container_of(b, struct tomoyo_no_rewrite, head) | |
36f5e1ff TH |
437 | ->pattern; |
438 | } | |
439 | ||
b69a54ee | 440 | /** |
e2bf6907 | 441 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite" list. |
b69a54ee KT |
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. | |
fdb8ebb7 TH |
447 | * |
448 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
449 | */ |
450 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
451 | const bool is_delete) | |
452 | { | |
e2bf6907 | 453 | struct tomoyo_no_rewrite e = { }; |
36f5e1ff | 454 | int error; |
b69a54ee | 455 | |
75093152 | 456 | if (!tomoyo_correct_word(pattern)) |
b69a54ee | 457 | return -EINVAL; |
9e4b50e9 TH |
458 | e.pattern = tomoyo_get_name(pattern); |
459 | if (!e.pattern) | |
36f5e1ff TH |
460 | return -ENOMEM; |
461 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
a230f9e7 | 462 | &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
36f5e1ff | 463 | tomoyo_same_no_rewrite); |
9e4b50e9 | 464 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
465 | return error; |
466 | } | |
467 | ||
468 | /** | |
75093152 | 469 | * tomoyo_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. |
b69a54ee KT |
470 | * |
471 | * @filename: Filename to check. | |
472 | * | |
473 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
474 | * false otherwise. | |
fdb8ebb7 TH |
475 | * |
476 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 477 | */ |
75093152 | 478 | static bool tomoyo_no_rewrite_file(const struct tomoyo_path_info *filename) |
b69a54ee | 479 | { |
e2bf6907 | 480 | struct tomoyo_no_rewrite *ptr; |
b69a54ee KT |
481 | bool found = false; |
482 | ||
a230f9e7 TH |
483 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
484 | head.list) { | |
82e0f001 | 485 | if (ptr->head.is_deleted) |
b69a54ee KT |
486 | continue; |
487 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
488 | continue; | |
489 | found = true; | |
490 | break; | |
491 | } | |
b69a54ee KT |
492 | return found; |
493 | } | |
494 | ||
495 | /** | |
e2bf6907 | 496 | * tomoyo_write_no_rewrite - Write "struct tomoyo_no_rewrite" list. |
b69a54ee KT |
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. | |
fdb8ebb7 TH |
502 | * |
503 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 504 | */ |
e2bf6907 | 505 | int tomoyo_write_no_rewrite(char *data, const bool is_delete) |
b69a54ee KT |
506 | { |
507 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
508 | } | |
509 | ||
484ca79c | 510 | static bool tomoyo_check_path_acl(struct tomoyo_request_info *r, |
99a85259 | 511 | const struct tomoyo_acl_info *ptr) |
b69a54ee | 512 | { |
99a85259 TH |
513 | const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl), |
514 | head); | |
484ca79c TH |
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; | |
99a85259 | 522 | } |
b69a54ee | 523 | |
484ca79c | 524 | static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r, |
99a85259 TH |
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 | ||
484ca79c | 536 | static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r, |
99a85259 TH |
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 | ||
484ca79c | 547 | static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r, |
99a85259 TH |
548 | const struct tomoyo_acl_info *ptr) |
549 | { | |
75093152 | 550 | const struct tomoyo_mkdev_acl *acl = |
99a85259 TH |
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); | |
b69a54ee KT |
561 | } |
562 | ||
237ab459 TH |
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); | |
75093152 TH |
568 | return tomoyo_same_acl_head(&p1->head, &p2->head) && |
569 | tomoyo_same_name_union(&p1->name, &p2->name); | |
237ab459 TH |
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 | ||
b69a54ee | 597 | /** |
7ef61233 | 598 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
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. | |
fdb8ebb7 TH |
606 | * |
607 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 608 | */ |
7ef61233 | 609 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
237ab459 | 610 | struct tomoyo_domain_info * const domain, |
7ef61233 | 611 | const bool is_delete) |
b69a54ee | 612 | { |
9e4b50e9 TH |
613 | struct tomoyo_path_acl e = { |
614 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
237ab459 | 615 | .perm = 1 << type |
9e4b50e9 | 616 | }; |
237ab459 TH |
617 | int error; |
618 | if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE)) | |
619 | e.perm |= TOMOYO_RW_MASK; | |
7762fbff | 620 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 621 | return -EINVAL; |
237ab459 TH |
622 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
623 | tomoyo_same_path_acl, | |
624 | tomoyo_merge_path_acl); | |
7762fbff | 625 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
626 | return error; |
627 | } | |
628 | ||
75093152 | 629 | static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a, |
237ab459 TH |
630 | const struct tomoyo_acl_info *b) |
631 | { | |
75093152 | 632 | const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), |
237ab459 | 633 | head); |
75093152 | 634 | const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), |
237ab459 | 635 | head); |
75093152 TH |
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); | |
237ab459 TH |
641 | } |
642 | ||
75093152 | 643 | static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, |
237ab459 TH |
644 | struct tomoyo_acl_info *b, |
645 | const bool is_delete) | |
646 | { | |
75093152 | 647 | u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl, |
237ab459 TH |
648 | head)->perm; |
649 | u8 perm = *a_perm; | |
75093152 | 650 | const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head) |
237ab459 TH |
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 | ||
a1f9bb6a | 660 | /** |
75093152 | 661 | * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list. |
a1f9bb6a TH |
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. | |
237ab459 TH |
672 | * |
673 | * Caller holds tomoyo_read_lock(). | |
a1f9bb6a | 674 | */ |
75093152 | 675 | static int tomoyo_update_mkdev_acl(const u8 type, const char *filename, |
237ab459 TH |
676 | char *mode, char *major, char *minor, |
677 | struct tomoyo_domain_info * const | |
678 | domain, const bool is_delete) | |
a1f9bb6a | 679 | { |
75093152 TH |
680 | struct tomoyo_mkdev_acl e = { |
681 | .head.type = TOMOYO_TYPE_MKDEV_ACL, | |
237ab459 | 682 | .perm = 1 << type |
a1f9bb6a TH |
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; | |
237ab459 | 690 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
75093152 TH |
691 | tomoyo_same_mkdev_acl, |
692 | tomoyo_merge_mkdev_acl); | |
a1f9bb6a TH |
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 | ||
237ab459 TH |
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); | |
75093152 TH |
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); | |
237ab459 TH |
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 | ||
b69a54ee | 727 | /** |
7ef61233 | 728 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
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. | |
fdb8ebb7 TH |
737 | * |
738 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 739 | */ |
7ef61233 TH |
740 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
741 | const char *filename2, | |
237ab459 | 742 | struct tomoyo_domain_info * const domain, |
7ef61233 | 743 | const bool is_delete) |
b69a54ee | 744 | { |
9e4b50e9 TH |
745 | struct tomoyo_path2_acl e = { |
746 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
237ab459 | 747 | .perm = 1 << type |
9e4b50e9 | 748 | }; |
ca0b7df3 | 749 | int error = is_delete ? -ENOENT : -ENOMEM; |
7762fbff TH |
750 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
751 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 752 | goto out; |
237ab459 TH |
753 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
754 | tomoyo_same_path2_acl, | |
755 | tomoyo_merge_path2_acl); | |
ca0b7df3 | 756 | out: |
7762fbff TH |
757 | tomoyo_put_name_union(&e.name1); |
758 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
759 | return error; |
760 | } | |
761 | ||
b69a54ee | 762 | /** |
cb0abe6a | 763 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 764 | * |
cb0abe6a | 765 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
766 | * @operation: Type of operation. |
767 | * @filename: Filename to check. | |
b69a54ee KT |
768 | * |
769 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
770 | * |
771 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 772 | */ |
05336dee TH |
773 | int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
774 | const struct tomoyo_path_info *filename) | |
b69a54ee | 775 | { |
b69a54ee | 776 | int error; |
b69a54ee | 777 | |
b69a54ee | 778 | next: |
57c2590f TH |
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; | |
cf6e9a64 TH |
783 | r->param_type = TOMOYO_TYPE_PATH_ACL; |
784 | r->param.path.filename = filename; | |
785 | r->param.path.operation = operation; | |
17fcfbd9 | 786 | do { |
99a85259 TH |
787 | tomoyo_check_acl(r, tomoyo_check_path_acl); |
788 | if (!r->granted && operation == TOMOYO_TYPE_READ && | |
05336dee | 789 | !r->domain->ignore_global_allow_read && |
75093152 | 790 | tomoyo_globally_readable_file(filename)) |
99a85259 TH |
791 | r->granted = true; |
792 | error = tomoyo_audit_path_log(r); | |
05336dee TH |
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); | |
b69a54ee KT |
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 | */ | |
7ef61233 | 804 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
75093152 | 805 | tomoyo_no_rewrite_file(filename)) { |
7ef61233 | 806 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
807 | goto next; |
808 | } | |
809 | return error; | |
810 | } | |
811 | ||
237ab459 TH |
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); | |
75093152 TH |
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); | |
237ab459 TH |
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 | ||
a1f9bb6a TH |
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 | */ | |
237ab459 TH |
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) | |
a1f9bb6a | 857 | { |
a1f9bb6a TH |
858 | struct tomoyo_path_number_acl e = { |
859 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
237ab459 | 860 | .perm = 1 << type |
a1f9bb6a TH |
861 | }; |
862 | int error = is_delete ? -ENOENT : -ENOMEM; | |
a1f9bb6a TH |
863 | if (!tomoyo_parse_name_union(filename, &e.name)) |
864 | return -EINVAL; | |
865 | if (!tomoyo_parse_number_union(number, &e.number)) | |
866 | goto out; | |
237ab459 TH |
867 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
868 | tomoyo_same_path_number_acl, | |
869 | tomoyo_merge_path_number_acl); | |
a1f9bb6a TH |
870 | out: |
871 | tomoyo_put_name_union(&e.name); | |
872 | tomoyo_put_number_union(&e.number); | |
873 | return error; | |
874 | } | |
875 | ||
a1f9bb6a TH |
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; | |
c8c57e84 | 890 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
891 | int idx; |
892 | ||
57c2590f TH |
893 | if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
894 | == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) | |
a1f9bb6a TH |
895 | return 0; |
896 | idx = tomoyo_read_lock(); | |
c8c57e84 | 897 | if (!tomoyo_get_realpath(&buf, path)) |
a1f9bb6a | 898 | goto out; |
c8c57e84 TH |
899 | if (type == TOMOYO_TYPE_MKDIR) |
900 | tomoyo_add_slash(&buf); | |
cb917cf5 TH |
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); | |
c8c57e84 | 909 | kfree(buf.name); |
cb917cf5 | 910 | out: |
a1f9bb6a TH |
911 | tomoyo_read_unlock(idx); |
912 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
913 | error = 0; | |
914 | return error; | |
915 | } | |
916 | ||
b69a54ee KT |
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); | |
eae61f3c | 930 | int error = 0; |
c8c57e84 | 931 | struct tomoyo_path_info buf; |
cb0abe6a | 932 | struct tomoyo_request_info r; |
fdb8ebb7 | 933 | int idx; |
b69a54ee | 934 | |
57c2590f TH |
935 | if (!path->mnt || |
936 | (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))) | |
b69a54ee | 937 | return 0; |
57c2590f TH |
938 | buf.name = NULL; |
939 | r.mode = TOMOYO_CONFIG_DISABLED; | |
fdb8ebb7 | 940 | idx = tomoyo_read_lock(); |
b69a54ee KT |
941 | /* |
942 | * If the filename is specified by "deny_rewrite" keyword, | |
943 | * we need to check "allow_rewrite" permission when the filename is not | |
944 | * opened for append mode or the filename is truncated at open time. | |
945 | */ | |
57c2590f TH |
946 | if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND) |
947 | && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE) | |
948 | != TOMOYO_CONFIG_DISABLED) { | |
949 | if (!tomoyo_get_realpath(&buf, path)) { | |
950 | error = -ENOMEM; | |
951 | goto out; | |
952 | } | |
75093152 | 953 | if (tomoyo_no_rewrite_file(&buf)) |
57c2590f TH |
954 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, |
955 | &buf); | |
b69a54ee | 956 | } |
57c2590f TH |
957 | if (!error && acc_mode && |
958 | tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) | |
959 | != TOMOYO_CONFIG_DISABLED) { | |
05336dee | 960 | u8 operation; |
57c2590f TH |
961 | if (!buf.name && !tomoyo_get_realpath(&buf, path)) { |
962 | error = -ENOMEM; | |
963 | goto out; | |
964 | } | |
05336dee TH |
965 | if (acc_mode == (MAY_READ | MAY_WRITE)) |
966 | operation = TOMOYO_TYPE_READ_WRITE; | |
967 | else if (acc_mode == MAY_READ) | |
968 | operation = TOMOYO_TYPE_READ; | |
969 | else | |
970 | operation = TOMOYO_TYPE_WRITE; | |
971 | error = tomoyo_path_permission(&r, operation, &buf); | |
57c2590f | 972 | } |
b69a54ee | 973 | out: |
c8c57e84 | 974 | kfree(buf.name); |
fdb8ebb7 | 975 | tomoyo_read_unlock(idx); |
cb0abe6a | 976 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
977 | error = 0; |
978 | return error; | |
979 | } | |
980 | ||
981 | /** | |
2106ccd9 | 982 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
b69a54ee | 983 | * |
b69a54ee KT |
984 | * @operation: Type of operation. |
985 | * @path: Pointer to "struct path". | |
986 | * | |
987 | * Returns 0 on success, negative value otherwise. | |
988 | */ | |
97d6931e | 989 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
990 | { |
991 | int error = -ENOMEM; | |
c8c57e84 | 992 | struct tomoyo_path_info buf; |
cb0abe6a | 993 | struct tomoyo_request_info r; |
fdb8ebb7 | 994 | int idx; |
b69a54ee | 995 | |
57c2590f TH |
996 | if (!path->mnt) |
997 | return 0; | |
998 | if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) | |
999 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1000 | return 0; |
57c2590f | 1001 | buf.name = NULL; |
fdb8ebb7 | 1002 | idx = tomoyo_read_lock(); |
c8c57e84 | 1003 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1004 | goto out; |
1005 | switch (operation) { | |
cb0abe6a | 1006 | case TOMOYO_TYPE_REWRITE: |
75093152 | 1007 | if (!tomoyo_no_rewrite_file(&buf)) { |
cb0abe6a TH |
1008 | error = 0; |
1009 | goto out; | |
1010 | } | |
1011 | break; | |
7ef61233 TH |
1012 | case TOMOYO_TYPE_RMDIR: |
1013 | case TOMOYO_TYPE_CHROOT: | |
c8c57e84 TH |
1014 | tomoyo_add_slash(&buf); |
1015 | break; | |
b69a54ee | 1016 | } |
c8c57e84 | 1017 | error = tomoyo_path_permission(&r, operation, &buf); |
b69a54ee | 1018 | out: |
c8c57e84 | 1019 | kfree(buf.name); |
fdb8ebb7 | 1020 | tomoyo_read_unlock(idx); |
cb0abe6a | 1021 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1022 | error = 0; |
1023 | return error; | |
1024 | } | |
1025 | ||
a1f9bb6a | 1026 | /** |
75093152 | 1027 | * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar". |
a1f9bb6a TH |
1028 | * |
1029 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
1030 | * @path: Pointer to "struct path". | |
1031 | * @mode: Create mode. | |
1032 | * @dev: Device number. | |
1033 | * | |
1034 | * Returns 0 on success, negative value otherwise. | |
1035 | */ | |
75093152 | 1036 | int tomoyo_mkdev_perm(const u8 operation, struct path *path, |
a1f9bb6a TH |
1037 | const unsigned int mode, unsigned int dev) |
1038 | { | |
1039 | struct tomoyo_request_info r; | |
1040 | int error = -ENOMEM; | |
c8c57e84 | 1041 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1042 | int idx; |
1043 | ||
57c2590f TH |
1044 | if (!path->mnt || |
1045 | tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) | |
1046 | == TOMOYO_CONFIG_DISABLED) | |
a1f9bb6a TH |
1047 | return 0; |
1048 | idx = tomoyo_read_lock(); | |
1049 | error = -ENOMEM; | |
c8c57e84 | 1050 | if (tomoyo_get_realpath(&buf, path)) { |
cf6e9a64 | 1051 | dev = new_decode_dev(dev); |
75093152 | 1052 | r.param_type = TOMOYO_TYPE_MKDEV_ACL; |
cf6e9a64 TH |
1053 | r.param.mkdev.filename = &buf; |
1054 | r.param.mkdev.operation = operation; | |
1055 | r.param.mkdev.mode = mode; | |
1056 | r.param.mkdev.major = MAJOR(dev); | |
1057 | r.param.mkdev.minor = MINOR(dev); | |
99a85259 TH |
1058 | tomoyo_check_acl(&r, tomoyo_check_mkdev_acl); |
1059 | error = tomoyo_audit_mkdev_log(&r); | |
c8c57e84 | 1060 | kfree(buf.name); |
a1f9bb6a TH |
1061 | } |
1062 | tomoyo_read_unlock(idx); | |
1063 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1064 | error = 0; | |
1065 | return error; | |
1066 | } | |
1067 | ||
b69a54ee | 1068 | /** |
7ef61233 | 1069 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1070 | * |
b69a54ee KT |
1071 | * @operation: Type of operation. |
1072 | * @path1: Pointer to "struct path". | |
1073 | * @path2: Pointer to "struct path". | |
1074 | * | |
1075 | * Returns 0 on success, negative value otherwise. | |
1076 | */ | |
97d6931e | 1077 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1078 | struct path *path2) |
b69a54ee KT |
1079 | { |
1080 | int error = -ENOMEM; | |
c8c57e84 TH |
1081 | struct tomoyo_path_info buf1; |
1082 | struct tomoyo_path_info buf2; | |
cb0abe6a | 1083 | struct tomoyo_request_info r; |
fdb8ebb7 | 1084 | int idx; |
b69a54ee | 1085 | |
57c2590f TH |
1086 | if (!path1->mnt || !path2->mnt || |
1087 | tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) | |
1088 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1089 | return 0; |
c8c57e84 TH |
1090 | buf1.name = NULL; |
1091 | buf2.name = NULL; | |
fdb8ebb7 | 1092 | idx = tomoyo_read_lock(); |
c8c57e84 TH |
1093 | if (!tomoyo_get_realpath(&buf1, path1) || |
1094 | !tomoyo_get_realpath(&buf2, path2)) | |
b69a54ee | 1095 | goto out; |
57c2590f TH |
1096 | switch (operation) { |
1097 | struct dentry *dentry; | |
1098 | case TOMOYO_TYPE_RENAME: | |
1099 | case TOMOYO_TYPE_LINK: | |
1100 | dentry = path1->dentry; | |
1101 | if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) | |
1102 | break; | |
1103 | /* fall through */ | |
1104 | case TOMOYO_TYPE_PIVOT_ROOT: | |
1105 | tomoyo_add_slash(&buf1); | |
1106 | tomoyo_add_slash(&buf2); | |
1107 | break; | |
1108 | } | |
cf6e9a64 TH |
1109 | r.param_type = TOMOYO_TYPE_PATH2_ACL; |
1110 | r.param.path2.operation = operation; | |
1111 | r.param.path2.filename1 = &buf1; | |
1112 | r.param.path2.filename2 = &buf2; | |
17fcfbd9 | 1113 | do { |
99a85259 TH |
1114 | tomoyo_check_acl(&r, tomoyo_check_path2_acl); |
1115 | error = tomoyo_audit_path2_log(&r); | |
1116 | } while (error == TOMOYO_RETRY_REQUEST); | |
b69a54ee | 1117 | out: |
c8c57e84 TH |
1118 | kfree(buf1.name); |
1119 | kfree(buf2.name); | |
fdb8ebb7 | 1120 | tomoyo_read_unlock(idx); |
cb0abe6a | 1121 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1122 | error = 0; |
1123 | return error; | |
1124 | } | |
a1f9bb6a TH |
1125 | |
1126 | /** | |
e2bf6907 | 1127 | * tomoyo_write_file - Update file related list. |
a1f9bb6a TH |
1128 | * |
1129 | * @data: String to parse. | |
1130 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1131 | * @is_delete: True if it is a delete request. | |
1132 | * | |
1133 | * Returns 0 on success, negative value otherwise. | |
1134 | * | |
1135 | * Caller holds tomoyo_read_lock(). | |
1136 | */ | |
e2bf6907 TH |
1137 | int tomoyo_write_file(char *data, struct tomoyo_domain_info *domain, |
1138 | const bool is_delete) | |
a1f9bb6a TH |
1139 | { |
1140 | char *w[5]; | |
1141 | u8 type; | |
1142 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
1143 | return -EINVAL; | |
237ab459 | 1144 | if (strncmp(w[0], "allow_", 6)) |
a1f9bb6a | 1145 | goto out; |
a1f9bb6a TH |
1146 | w[0] += 6; |
1147 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
1148 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
1149 | continue; | |
1150 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
1151 | } | |
1152 | if (!w[2][0]) | |
1153 | goto out; | |
1154 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
1155 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
1156 | continue; | |
1157 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
1158 | is_delete); | |
1159 | } | |
1160 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
1161 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
1162 | continue; | |
1163 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
1164 | is_delete); | |
1165 | } | |
1166 | if (!w[3][0] || !w[4][0]) | |
1167 | goto out; | |
75093152 TH |
1168 | for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) { |
1169 | if (strcmp(w[0], tomoyo_mkdev_keyword[type])) | |
a1f9bb6a | 1170 | continue; |
75093152 TH |
1171 | return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3], |
1172 | w[4], domain, is_delete); | |
a1f9bb6a TH |
1173 | } |
1174 | out: | |
1175 | return -EINVAL; | |
1176 | } |