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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 | ||
347 | /** | |
348 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
349 | * | |
350 | * @head: Pointer to "struct tomoyo_io_buffer". | |
351 | * | |
352 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
353 | * |
354 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
355 | */ |
356 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
357 | { | |
358 | struct list_head *pos; | |
359 | bool done = true; | |
360 | ||
b69a54ee | 361 | list_for_each_cookie(pos, head->read_var2, |
a230f9e7 | 362 | &tomoyo_policy_list[TOMOYO_ID_GLOBALLY_READABLE]) { |
b69a54ee KT |
363 | struct tomoyo_globally_readable_file_entry *ptr; |
364 | ptr = list_entry(pos, | |
365 | struct tomoyo_globally_readable_file_entry, | |
82e0f001 TH |
366 | head.list); |
367 | if (ptr->head.is_deleted) | |
b69a54ee | 368 | continue; |
7d2948b1 TH |
369 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
370 | ptr->filename->name); | |
371 | if (!done) | |
b69a54ee | 372 | break; |
b69a54ee | 373 | } |
b69a54ee KT |
374 | return done; |
375 | } | |
376 | ||
36f5e1ff TH |
377 | static bool tomoyo_same_pattern(const struct tomoyo_acl_head *a, |
378 | const struct tomoyo_acl_head *b) | |
379 | { | |
380 | return container_of(a, struct tomoyo_pattern_entry, head)->pattern == | |
381 | container_of(b, struct tomoyo_pattern_entry, head)->pattern; | |
382 | } | |
383 | ||
b69a54ee KT |
384 | /** |
385 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
386 | * | |
387 | * @pattern: Pathname pattern. | |
388 | * @is_delete: True if it is a delete request. | |
389 | * | |
390 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
391 | * |
392 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
393 | */ |
394 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
395 | const bool is_delete) | |
396 | { | |
3f629636 | 397 | struct tomoyo_pattern_entry e = { }; |
36f5e1ff | 398 | int error; |
b69a54ee | 399 | |
75093152 | 400 | if (!tomoyo_correct_word(pattern)) |
3f629636 TH |
401 | return -EINVAL; |
402 | e.pattern = tomoyo_get_name(pattern); | |
9e4b50e9 | 403 | if (!e.pattern) |
36f5e1ff TH |
404 | return -ENOMEM; |
405 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
a230f9e7 | 406 | &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
36f5e1ff | 407 | tomoyo_same_pattern); |
9e4b50e9 | 408 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
409 | return error; |
410 | } | |
411 | ||
412 | /** | |
17fcfbd9 | 413 | * tomoyo_file_pattern - Get patterned pathname. |
b69a54ee KT |
414 | * |
415 | * @filename: The filename to find patterned pathname. | |
416 | * | |
417 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
418 | * |
419 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 420 | */ |
17fcfbd9 | 421 | const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename) |
b69a54ee KT |
422 | { |
423 | struct tomoyo_pattern_entry *ptr; | |
424 | const struct tomoyo_path_info *pattern = NULL; | |
425 | ||
a230f9e7 TH |
426 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
427 | head.list) { | |
82e0f001 | 428 | if (ptr->head.is_deleted) |
b69a54ee KT |
429 | continue; |
430 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
431 | continue; | |
432 | pattern = ptr->pattern; | |
433 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
434 | /* Do nothing. Try to find the better match. */ | |
435 | } else { | |
436 | /* This would be the better match. Use this. */ | |
437 | break; | |
438 | } | |
439 | } | |
b69a54ee KT |
440 | if (pattern) |
441 | filename = pattern; | |
17fcfbd9 | 442 | return filename->name; |
b69a54ee KT |
443 | } |
444 | ||
445 | /** | |
446 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
447 | * | |
448 | * @data: String to parse. | |
449 | * @is_delete: True if it is a delete request. | |
450 | * | |
451 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
452 | * |
453 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
454 | */ |
455 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
456 | { | |
457 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
458 | } | |
459 | ||
460 | /** | |
461 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
462 | * | |
463 | * @head: Pointer to "struct tomoyo_io_buffer". | |
464 | * | |
465 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
466 | * |
467 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
468 | */ |
469 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
470 | { | |
471 | struct list_head *pos; | |
472 | bool done = true; | |
473 | ||
a230f9e7 TH |
474 | list_for_each_cookie(pos, head->read_var2, |
475 | &tomoyo_policy_list[TOMOYO_ID_PATTERN]) { | |
b69a54ee | 476 | struct tomoyo_pattern_entry *ptr; |
82e0f001 TH |
477 | ptr = list_entry(pos, struct tomoyo_pattern_entry, head.list); |
478 | if (ptr->head.is_deleted) | |
b69a54ee | 479 | continue; |
7d2948b1 TH |
480 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
481 | "%s\n", ptr->pattern->name); | |
482 | if (!done) | |
b69a54ee | 483 | break; |
b69a54ee | 484 | } |
b69a54ee KT |
485 | return done; |
486 | } | |
487 | ||
36f5e1ff TH |
488 | static bool tomoyo_same_no_rewrite(const struct tomoyo_acl_head *a, |
489 | const struct tomoyo_acl_head *b) | |
490 | { | |
491 | return container_of(a, struct tomoyo_no_rewrite_entry, head)->pattern | |
492 | == container_of(b, struct tomoyo_no_rewrite_entry, head) | |
493 | ->pattern; | |
494 | } | |
495 | ||
b69a54ee KT |
496 | /** |
497 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
498 | * | |
499 | * @pattern: Pathname pattern that are not rewritable by default. | |
500 | * @is_delete: True if it is a delete request. | |
501 | * | |
502 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
503 | * |
504 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
505 | */ |
506 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
507 | const bool is_delete) | |
508 | { | |
9e4b50e9 | 509 | struct tomoyo_no_rewrite_entry e = { }; |
36f5e1ff | 510 | int error; |
b69a54ee | 511 | |
75093152 | 512 | if (!tomoyo_correct_word(pattern)) |
b69a54ee | 513 | return -EINVAL; |
9e4b50e9 TH |
514 | e.pattern = tomoyo_get_name(pattern); |
515 | if (!e.pattern) | |
36f5e1ff TH |
516 | return -ENOMEM; |
517 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
a230f9e7 | 518 | &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
36f5e1ff | 519 | tomoyo_same_no_rewrite); |
9e4b50e9 | 520 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
521 | return error; |
522 | } | |
523 | ||
524 | /** | |
75093152 | 525 | * tomoyo_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. |
b69a54ee KT |
526 | * |
527 | * @filename: Filename to check. | |
528 | * | |
529 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
530 | * false otherwise. | |
fdb8ebb7 TH |
531 | * |
532 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 533 | */ |
75093152 | 534 | static bool tomoyo_no_rewrite_file(const struct tomoyo_path_info *filename) |
b69a54ee KT |
535 | { |
536 | struct tomoyo_no_rewrite_entry *ptr; | |
537 | bool found = false; | |
538 | ||
a230f9e7 TH |
539 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
540 | head.list) { | |
82e0f001 | 541 | if (ptr->head.is_deleted) |
b69a54ee KT |
542 | continue; |
543 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
544 | continue; | |
545 | found = true; | |
546 | break; | |
547 | } | |
b69a54ee KT |
548 | return found; |
549 | } | |
550 | ||
551 | /** | |
552 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
553 | * | |
554 | * @data: String to parse. | |
555 | * @is_delete: True if it is a delete request. | |
556 | * | |
557 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
558 | * |
559 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
560 | */ |
561 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
562 | { | |
563 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
564 | } | |
565 | ||
566 | /** | |
567 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
568 | * | |
569 | * @head: Pointer to "struct tomoyo_io_buffer". | |
570 | * | |
571 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
572 | * |
573 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
574 | */ |
575 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
576 | { | |
577 | struct list_head *pos; | |
578 | bool done = true; | |
579 | ||
a230f9e7 TH |
580 | list_for_each_cookie(pos, head->read_var2, |
581 | &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE]) { | |
b69a54ee | 582 | struct tomoyo_no_rewrite_entry *ptr; |
82e0f001 TH |
583 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, |
584 | head.list); | |
585 | if (ptr->head.is_deleted) | |
b69a54ee | 586 | continue; |
7d2948b1 TH |
587 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
588 | "%s\n", ptr->pattern->name); | |
589 | if (!done) | |
b69a54ee | 590 | break; |
b69a54ee | 591 | } |
b69a54ee KT |
592 | return done; |
593 | } | |
594 | ||
99a85259 TH |
595 | static bool tomoyo_check_path_acl(const struct tomoyo_request_info *r, |
596 | const struct tomoyo_acl_info *ptr) | |
b69a54ee | 597 | { |
99a85259 TH |
598 | const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl), |
599 | head); | |
600 | return (acl->perm & (1 << r->param.path.operation)) && | |
601 | tomoyo_compare_name_union(r->param.path.filename, &acl->name); | |
602 | } | |
b69a54ee | 603 | |
99a85259 TH |
604 | static bool tomoyo_check_path_number_acl(const struct tomoyo_request_info *r, |
605 | const struct tomoyo_acl_info *ptr) | |
606 | { | |
607 | const struct tomoyo_path_number_acl *acl = | |
608 | container_of(ptr, typeof(*acl), head); | |
609 | return (acl->perm & (1 << r->param.path_number.operation)) && | |
610 | tomoyo_compare_number_union(r->param.path_number.number, | |
611 | &acl->number) && | |
612 | tomoyo_compare_name_union(r->param.path_number.filename, | |
613 | &acl->name); | |
614 | } | |
615 | ||
616 | static bool tomoyo_check_path2_acl(const struct tomoyo_request_info *r, | |
617 | const struct tomoyo_acl_info *ptr) | |
618 | { | |
619 | const struct tomoyo_path2_acl *acl = | |
620 | container_of(ptr, typeof(*acl), head); | |
621 | return (acl->perm & (1 << r->param.path2.operation)) && | |
622 | tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1) | |
623 | && tomoyo_compare_name_union(r->param.path2.filename2, | |
624 | &acl->name2); | |
625 | } | |
626 | ||
627 | static bool tomoyo_check_mkdev_acl(const struct tomoyo_request_info *r, | |
628 | const struct tomoyo_acl_info *ptr) | |
629 | { | |
75093152 | 630 | const struct tomoyo_mkdev_acl *acl = |
99a85259 TH |
631 | container_of(ptr, typeof(*acl), head); |
632 | return (acl->perm & (1 << r->param.mkdev.operation)) && | |
633 | tomoyo_compare_number_union(r->param.mkdev.mode, | |
634 | &acl->mode) && | |
635 | tomoyo_compare_number_union(r->param.mkdev.major, | |
636 | &acl->major) && | |
637 | tomoyo_compare_number_union(r->param.mkdev.minor, | |
638 | &acl->minor) && | |
639 | tomoyo_compare_name_union(r->param.mkdev.filename, | |
640 | &acl->name); | |
b69a54ee KT |
641 | } |
642 | ||
237ab459 TH |
643 | static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, |
644 | const struct tomoyo_acl_info *b) | |
645 | { | |
646 | const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); | |
647 | const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
648 | return tomoyo_same_acl_head(&p1->head, &p2->head) && |
649 | tomoyo_same_name_union(&p1->name, &p2->name); | |
237ab459 TH |
650 | } |
651 | ||
652 | static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, | |
653 | struct tomoyo_acl_info *b, | |
654 | const bool is_delete) | |
655 | { | |
656 | u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head) | |
657 | ->perm; | |
658 | u16 perm = *a_perm; | |
659 | const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; | |
660 | if (is_delete) { | |
661 | perm &= ~b_perm; | |
662 | if ((perm & TOMOYO_RW_MASK) != TOMOYO_RW_MASK) | |
663 | perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); | |
664 | else if (!(perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
665 | perm &= ~TOMOYO_RW_MASK; | |
666 | } else { | |
667 | perm |= b_perm; | |
668 | if ((perm & TOMOYO_RW_MASK) == TOMOYO_RW_MASK) | |
669 | perm |= (1 << TOMOYO_TYPE_READ_WRITE); | |
670 | else if (perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
671 | perm |= TOMOYO_RW_MASK; | |
672 | } | |
673 | *a_perm = perm; | |
674 | return !perm; | |
675 | } | |
676 | ||
b69a54ee | 677 | /** |
7ef61233 | 678 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
679 | * |
680 | * @type: Type of operation. | |
681 | * @filename: Filename. | |
682 | * @domain: Pointer to "struct tomoyo_domain_info". | |
683 | * @is_delete: True if it is a delete request. | |
684 | * | |
685 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
686 | * |
687 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 688 | */ |
7ef61233 | 689 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
237ab459 | 690 | struct tomoyo_domain_info * const domain, |
7ef61233 | 691 | const bool is_delete) |
b69a54ee | 692 | { |
9e4b50e9 TH |
693 | struct tomoyo_path_acl e = { |
694 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
237ab459 | 695 | .perm = 1 << type |
9e4b50e9 | 696 | }; |
237ab459 TH |
697 | int error; |
698 | if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE)) | |
699 | e.perm |= TOMOYO_RW_MASK; | |
7762fbff | 700 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 701 | return -EINVAL; |
237ab459 TH |
702 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
703 | tomoyo_same_path_acl, | |
704 | tomoyo_merge_path_acl); | |
7762fbff | 705 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
706 | return error; |
707 | } | |
708 | ||
75093152 | 709 | static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a, |
237ab459 TH |
710 | const struct tomoyo_acl_info *b) |
711 | { | |
75093152 | 712 | const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), |
237ab459 | 713 | head); |
75093152 | 714 | const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), |
237ab459 | 715 | head); |
75093152 TH |
716 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
717 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
718 | && tomoyo_same_number_union(&p1->mode, &p2->mode) | |
719 | && tomoyo_same_number_union(&p1->major, &p2->major) | |
720 | && tomoyo_same_number_union(&p1->minor, &p2->minor); | |
237ab459 TH |
721 | } |
722 | ||
75093152 | 723 | static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, |
237ab459 TH |
724 | struct tomoyo_acl_info *b, |
725 | const bool is_delete) | |
726 | { | |
75093152 | 727 | u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl, |
237ab459 TH |
728 | head)->perm; |
729 | u8 perm = *a_perm; | |
75093152 | 730 | const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head) |
237ab459 TH |
731 | ->perm; |
732 | if (is_delete) | |
733 | perm &= ~b_perm; | |
734 | else | |
735 | perm |= b_perm; | |
736 | *a_perm = perm; | |
737 | return !perm; | |
738 | } | |
739 | ||
a1f9bb6a | 740 | /** |
75093152 | 741 | * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list. |
a1f9bb6a TH |
742 | * |
743 | * @type: Type of operation. | |
744 | * @filename: Filename. | |
745 | * @mode: Create mode. | |
746 | * @major: Device major number. | |
747 | * @minor: Device minor number. | |
748 | * @domain: Pointer to "struct tomoyo_domain_info". | |
749 | * @is_delete: True if it is a delete request. | |
750 | * | |
751 | * Returns 0 on success, negative value otherwise. | |
237ab459 TH |
752 | * |
753 | * Caller holds tomoyo_read_lock(). | |
a1f9bb6a | 754 | */ |
75093152 | 755 | static int tomoyo_update_mkdev_acl(const u8 type, const char *filename, |
237ab459 TH |
756 | char *mode, char *major, char *minor, |
757 | struct tomoyo_domain_info * const | |
758 | domain, const bool is_delete) | |
a1f9bb6a | 759 | { |
75093152 TH |
760 | struct tomoyo_mkdev_acl e = { |
761 | .head.type = TOMOYO_TYPE_MKDEV_ACL, | |
237ab459 | 762 | .perm = 1 << type |
a1f9bb6a TH |
763 | }; |
764 | int error = is_delete ? -ENOENT : -ENOMEM; | |
765 | if (!tomoyo_parse_name_union(filename, &e.name) || | |
766 | !tomoyo_parse_number_union(mode, &e.mode) || | |
767 | !tomoyo_parse_number_union(major, &e.major) || | |
768 | !tomoyo_parse_number_union(minor, &e.minor)) | |
769 | goto out; | |
237ab459 | 770 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
75093152 TH |
771 | tomoyo_same_mkdev_acl, |
772 | tomoyo_merge_mkdev_acl); | |
a1f9bb6a TH |
773 | out: |
774 | tomoyo_put_name_union(&e.name); | |
775 | tomoyo_put_number_union(&e.mode); | |
776 | tomoyo_put_number_union(&e.major); | |
777 | tomoyo_put_number_union(&e.minor); | |
778 | return error; | |
779 | } | |
780 | ||
237ab459 TH |
781 | static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, |
782 | const struct tomoyo_acl_info *b) | |
783 | { | |
784 | const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); | |
785 | const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
786 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
787 | && tomoyo_same_name_union(&p1->name1, &p2->name1) | |
788 | && tomoyo_same_name_union(&p1->name2, &p2->name2); | |
237ab459 TH |
789 | } |
790 | ||
791 | static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a, | |
792 | struct tomoyo_acl_info *b, | |
793 | const bool is_delete) | |
794 | { | |
795 | u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head) | |
796 | ->perm; | |
797 | u8 perm = *a_perm; | |
798 | const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm; | |
799 | if (is_delete) | |
800 | perm &= ~b_perm; | |
801 | else | |
802 | perm |= b_perm; | |
803 | *a_perm = perm; | |
804 | return !perm; | |
805 | } | |
806 | ||
b69a54ee | 807 | /** |
7ef61233 | 808 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
809 | * |
810 | * @type: Type of operation. | |
811 | * @filename1: First filename. | |
812 | * @filename2: Second filename. | |
813 | * @domain: Pointer to "struct tomoyo_domain_info". | |
814 | * @is_delete: True if it is a delete request. | |
815 | * | |
816 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
817 | * |
818 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 819 | */ |
7ef61233 TH |
820 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
821 | const char *filename2, | |
237ab459 | 822 | struct tomoyo_domain_info * const domain, |
7ef61233 | 823 | const bool is_delete) |
b69a54ee | 824 | { |
9e4b50e9 TH |
825 | struct tomoyo_path2_acl e = { |
826 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
237ab459 | 827 | .perm = 1 << type |
9e4b50e9 | 828 | }; |
ca0b7df3 | 829 | int error = is_delete ? -ENOENT : -ENOMEM; |
7762fbff TH |
830 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
831 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 832 | goto out; |
237ab459 TH |
833 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
834 | tomoyo_same_path2_acl, | |
835 | tomoyo_merge_path2_acl); | |
ca0b7df3 | 836 | out: |
7762fbff TH |
837 | tomoyo_put_name_union(&e.name1); |
838 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
839 | return error; |
840 | } | |
841 | ||
b69a54ee | 842 | /** |
cb0abe6a | 843 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 844 | * |
cb0abe6a | 845 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
846 | * @operation: Type of operation. |
847 | * @filename: Filename to check. | |
b69a54ee KT |
848 | * |
849 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
850 | * |
851 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 852 | */ |
05336dee TH |
853 | int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
854 | const struct tomoyo_path_info *filename) | |
b69a54ee | 855 | { |
b69a54ee | 856 | int error; |
b69a54ee | 857 | |
b69a54ee | 858 | next: |
57c2590f TH |
859 | r->type = tomoyo_p2mac[operation]; |
860 | r->mode = tomoyo_get_mode(r->profile, r->type); | |
861 | if (r->mode == TOMOYO_CONFIG_DISABLED) | |
862 | return 0; | |
cf6e9a64 TH |
863 | r->param_type = TOMOYO_TYPE_PATH_ACL; |
864 | r->param.path.filename = filename; | |
865 | r->param.path.operation = operation; | |
17fcfbd9 | 866 | do { |
99a85259 TH |
867 | tomoyo_check_acl(r, tomoyo_check_path_acl); |
868 | if (!r->granted && operation == TOMOYO_TYPE_READ && | |
05336dee | 869 | !r->domain->ignore_global_allow_read && |
75093152 | 870 | tomoyo_globally_readable_file(filename)) |
99a85259 TH |
871 | r->granted = true; |
872 | error = tomoyo_audit_path_log(r); | |
05336dee TH |
873 | /* |
874 | * Do not retry for execute request, for alias may have | |
875 | * changed. | |
876 | */ | |
877 | } while (error == TOMOYO_RETRY_REQUEST && | |
878 | operation != TOMOYO_TYPE_EXECUTE); | |
b69a54ee KT |
879 | /* |
880 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
881 | * we need to check "allow_rewrite" permission if the filename is | |
882 | * specified by "deny_rewrite" keyword. | |
883 | */ | |
7ef61233 | 884 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
75093152 | 885 | tomoyo_no_rewrite_file(filename)) { |
7ef61233 | 886 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
887 | goto next; |
888 | } | |
889 | return error; | |
890 | } | |
891 | ||
237ab459 TH |
892 | static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, |
893 | const struct tomoyo_acl_info *b) | |
894 | { | |
895 | const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1), | |
896 | head); | |
897 | const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), | |
898 | head); | |
75093152 TH |
899 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
900 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
901 | && tomoyo_same_number_union(&p1->number, &p2->number); | |
237ab459 TH |
902 | } |
903 | ||
904 | static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, | |
905 | struct tomoyo_acl_info *b, | |
906 | const bool is_delete) | |
907 | { | |
908 | u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl, | |
909 | head)->perm; | |
910 | u8 perm = *a_perm; | |
911 | const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head) | |
912 | ->perm; | |
913 | if (is_delete) | |
914 | perm &= ~b_perm; | |
915 | else | |
916 | perm |= b_perm; | |
917 | *a_perm = perm; | |
918 | return !perm; | |
919 | } | |
920 | ||
a1f9bb6a TH |
921 | /** |
922 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. | |
923 | * | |
924 | * @type: Type of operation. | |
925 | * @filename: Filename. | |
926 | * @number: Number. | |
927 | * @domain: Pointer to "struct tomoyo_domain_info". | |
928 | * @is_delete: True if it is a delete request. | |
929 | * | |
930 | * Returns 0 on success, negative value otherwise. | |
931 | */ | |
237ab459 TH |
932 | static int tomoyo_update_path_number_acl(const u8 type, const char *filename, |
933 | char *number, | |
934 | struct tomoyo_domain_info * const | |
935 | domain, | |
936 | const bool is_delete) | |
a1f9bb6a | 937 | { |
a1f9bb6a TH |
938 | struct tomoyo_path_number_acl e = { |
939 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
237ab459 | 940 | .perm = 1 << type |
a1f9bb6a TH |
941 | }; |
942 | int error = is_delete ? -ENOENT : -ENOMEM; | |
a1f9bb6a TH |
943 | if (!tomoyo_parse_name_union(filename, &e.name)) |
944 | return -EINVAL; | |
945 | if (!tomoyo_parse_number_union(number, &e.number)) | |
946 | goto out; | |
237ab459 TH |
947 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
948 | tomoyo_same_path_number_acl, | |
949 | tomoyo_merge_path_number_acl); | |
a1f9bb6a TH |
950 | out: |
951 | tomoyo_put_name_union(&e.name); | |
952 | tomoyo_put_number_union(&e.number); | |
953 | return error; | |
954 | } | |
955 | ||
a1f9bb6a TH |
956 | /** |
957 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
958 | * | |
959 | * @type: Type of operation. | |
960 | * @path: Pointer to "struct path". | |
961 | * @number: Number. | |
962 | * | |
963 | * Returns 0 on success, negative value otherwise. | |
964 | */ | |
965 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
966 | unsigned long number) | |
967 | { | |
968 | struct tomoyo_request_info r; | |
969 | int error = -ENOMEM; | |
c8c57e84 | 970 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
971 | int idx; |
972 | ||
57c2590f TH |
973 | if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
974 | == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) | |
a1f9bb6a TH |
975 | return 0; |
976 | idx = tomoyo_read_lock(); | |
c8c57e84 | 977 | if (!tomoyo_get_realpath(&buf, path)) |
a1f9bb6a | 978 | goto out; |
c8c57e84 TH |
979 | if (type == TOMOYO_TYPE_MKDIR) |
980 | tomoyo_add_slash(&buf); | |
cb917cf5 TH |
981 | r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL; |
982 | r.param.path_number.operation = type; | |
983 | r.param.path_number.filename = &buf; | |
984 | r.param.path_number.number = number; | |
985 | do { | |
986 | tomoyo_check_acl(&r, tomoyo_check_path_number_acl); | |
987 | error = tomoyo_audit_path_number_log(&r); | |
988 | } while (error == TOMOYO_RETRY_REQUEST); | |
c8c57e84 | 989 | kfree(buf.name); |
cb917cf5 | 990 | out: |
a1f9bb6a TH |
991 | tomoyo_read_unlock(idx); |
992 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
993 | error = 0; | |
994 | return error; | |
995 | } | |
996 | ||
b69a54ee KT |
997 | /** |
998 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
999 | * | |
1000 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1001 | * @path: Pointer to "struct path". | |
1002 | * @flag: Flags for open(). | |
1003 | * | |
1004 | * Returns 0 on success, negative value otherwise. | |
1005 | */ | |
1006 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1007 | struct path *path, const int flag) | |
1008 | { | |
1009 | const u8 acc_mode = ACC_MODE(flag); | |
1010 | int error = -ENOMEM; | |
c8c57e84 | 1011 | struct tomoyo_path_info buf; |
cb0abe6a | 1012 | struct tomoyo_request_info r; |
fdb8ebb7 | 1013 | int idx; |
b69a54ee | 1014 | |
57c2590f TH |
1015 | if (!path->mnt || |
1016 | (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))) | |
b69a54ee | 1017 | return 0; |
57c2590f TH |
1018 | buf.name = NULL; |
1019 | r.mode = TOMOYO_CONFIG_DISABLED; | |
fdb8ebb7 | 1020 | idx = tomoyo_read_lock(); |
c8c57e84 | 1021 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1022 | goto out; |
1023 | error = 0; | |
1024 | /* | |
1025 | * If the filename is specified by "deny_rewrite" keyword, | |
1026 | * we need to check "allow_rewrite" permission when the filename is not | |
1027 | * opened for append mode or the filename is truncated at open time. | |
1028 | */ | |
57c2590f TH |
1029 | if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND) |
1030 | && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE) | |
1031 | != TOMOYO_CONFIG_DISABLED) { | |
1032 | if (!tomoyo_get_realpath(&buf, path)) { | |
1033 | error = -ENOMEM; | |
1034 | goto out; | |
1035 | } | |
75093152 | 1036 | if (tomoyo_no_rewrite_file(&buf)) |
57c2590f TH |
1037 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, |
1038 | &buf); | |
b69a54ee | 1039 | } |
57c2590f TH |
1040 | if (!error && acc_mode && |
1041 | tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) | |
1042 | != TOMOYO_CONFIG_DISABLED) { | |
05336dee | 1043 | u8 operation; |
57c2590f TH |
1044 | if (!buf.name && !tomoyo_get_realpath(&buf, path)) { |
1045 | error = -ENOMEM; | |
1046 | goto out; | |
1047 | } | |
05336dee TH |
1048 | if (acc_mode == (MAY_READ | MAY_WRITE)) |
1049 | operation = TOMOYO_TYPE_READ_WRITE; | |
1050 | else if (acc_mode == MAY_READ) | |
1051 | operation = TOMOYO_TYPE_READ; | |
1052 | else | |
1053 | operation = TOMOYO_TYPE_WRITE; | |
1054 | error = tomoyo_path_permission(&r, operation, &buf); | |
57c2590f | 1055 | } |
b69a54ee | 1056 | out: |
c8c57e84 | 1057 | kfree(buf.name); |
fdb8ebb7 | 1058 | tomoyo_read_unlock(idx); |
cb0abe6a | 1059 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1060 | error = 0; |
1061 | return error; | |
1062 | } | |
1063 | ||
1064 | /** | |
2106ccd9 | 1065 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
b69a54ee | 1066 | * |
b69a54ee KT |
1067 | * @operation: Type of operation. |
1068 | * @path: Pointer to "struct path". | |
1069 | * | |
1070 | * Returns 0 on success, negative value otherwise. | |
1071 | */ | |
97d6931e | 1072 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1073 | { |
1074 | int error = -ENOMEM; | |
c8c57e84 | 1075 | struct tomoyo_path_info buf; |
cb0abe6a | 1076 | struct tomoyo_request_info r; |
fdb8ebb7 | 1077 | int idx; |
b69a54ee | 1078 | |
57c2590f TH |
1079 | if (!path->mnt) |
1080 | return 0; | |
1081 | if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) | |
1082 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1083 | return 0; |
57c2590f | 1084 | buf.name = NULL; |
fdb8ebb7 | 1085 | idx = tomoyo_read_lock(); |
c8c57e84 | 1086 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1087 | goto out; |
1088 | switch (operation) { | |
cb0abe6a | 1089 | case TOMOYO_TYPE_REWRITE: |
75093152 | 1090 | if (!tomoyo_no_rewrite_file(&buf)) { |
cb0abe6a TH |
1091 | error = 0; |
1092 | goto out; | |
1093 | } | |
1094 | break; | |
7ef61233 TH |
1095 | case TOMOYO_TYPE_RMDIR: |
1096 | case TOMOYO_TYPE_CHROOT: | |
57c2590f | 1097 | case TOMOYO_TYPE_UMOUNT: |
c8c57e84 TH |
1098 | tomoyo_add_slash(&buf); |
1099 | break; | |
b69a54ee | 1100 | } |
c8c57e84 | 1101 | error = tomoyo_path_permission(&r, operation, &buf); |
b69a54ee | 1102 | out: |
c8c57e84 | 1103 | kfree(buf.name); |
fdb8ebb7 | 1104 | tomoyo_read_unlock(idx); |
cb0abe6a | 1105 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1106 | error = 0; |
1107 | return error; | |
1108 | } | |
1109 | ||
a1f9bb6a | 1110 | /** |
75093152 | 1111 | * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar". |
a1f9bb6a TH |
1112 | * |
1113 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
1114 | * @path: Pointer to "struct path". | |
1115 | * @mode: Create mode. | |
1116 | * @dev: Device number. | |
1117 | * | |
1118 | * Returns 0 on success, negative value otherwise. | |
1119 | */ | |
75093152 | 1120 | int tomoyo_mkdev_perm(const u8 operation, struct path *path, |
a1f9bb6a TH |
1121 | const unsigned int mode, unsigned int dev) |
1122 | { | |
1123 | struct tomoyo_request_info r; | |
1124 | int error = -ENOMEM; | |
c8c57e84 | 1125 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1126 | int idx; |
1127 | ||
57c2590f TH |
1128 | if (!path->mnt || |
1129 | tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) | |
1130 | == TOMOYO_CONFIG_DISABLED) | |
a1f9bb6a TH |
1131 | return 0; |
1132 | idx = tomoyo_read_lock(); | |
1133 | error = -ENOMEM; | |
c8c57e84 | 1134 | if (tomoyo_get_realpath(&buf, path)) { |
cf6e9a64 | 1135 | dev = new_decode_dev(dev); |
75093152 | 1136 | r.param_type = TOMOYO_TYPE_MKDEV_ACL; |
cf6e9a64 TH |
1137 | r.param.mkdev.filename = &buf; |
1138 | r.param.mkdev.operation = operation; | |
1139 | r.param.mkdev.mode = mode; | |
1140 | r.param.mkdev.major = MAJOR(dev); | |
1141 | r.param.mkdev.minor = MINOR(dev); | |
99a85259 TH |
1142 | tomoyo_check_acl(&r, tomoyo_check_mkdev_acl); |
1143 | error = tomoyo_audit_mkdev_log(&r); | |
c8c57e84 | 1144 | kfree(buf.name); |
a1f9bb6a TH |
1145 | } |
1146 | tomoyo_read_unlock(idx); | |
1147 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1148 | error = 0; | |
1149 | return error; | |
1150 | } | |
1151 | ||
b69a54ee | 1152 | /** |
7ef61233 | 1153 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1154 | * |
b69a54ee KT |
1155 | * @operation: Type of operation. |
1156 | * @path1: Pointer to "struct path". | |
1157 | * @path2: Pointer to "struct path". | |
1158 | * | |
1159 | * Returns 0 on success, negative value otherwise. | |
1160 | */ | |
97d6931e | 1161 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1162 | struct path *path2) |
b69a54ee KT |
1163 | { |
1164 | int error = -ENOMEM; | |
c8c57e84 TH |
1165 | struct tomoyo_path_info buf1; |
1166 | struct tomoyo_path_info buf2; | |
cb0abe6a | 1167 | struct tomoyo_request_info r; |
fdb8ebb7 | 1168 | int idx; |
b69a54ee | 1169 | |
57c2590f TH |
1170 | if (!path1->mnt || !path2->mnt || |
1171 | tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) | |
1172 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1173 | return 0; |
c8c57e84 TH |
1174 | buf1.name = NULL; |
1175 | buf2.name = NULL; | |
fdb8ebb7 | 1176 | idx = tomoyo_read_lock(); |
c8c57e84 TH |
1177 | if (!tomoyo_get_realpath(&buf1, path1) || |
1178 | !tomoyo_get_realpath(&buf2, path2)) | |
b69a54ee | 1179 | goto out; |
57c2590f TH |
1180 | switch (operation) { |
1181 | struct dentry *dentry; | |
1182 | case TOMOYO_TYPE_RENAME: | |
1183 | case TOMOYO_TYPE_LINK: | |
1184 | dentry = path1->dentry; | |
1185 | if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) | |
1186 | break; | |
1187 | /* fall through */ | |
1188 | case TOMOYO_TYPE_PIVOT_ROOT: | |
1189 | tomoyo_add_slash(&buf1); | |
1190 | tomoyo_add_slash(&buf2); | |
1191 | break; | |
1192 | } | |
cf6e9a64 TH |
1193 | r.param_type = TOMOYO_TYPE_PATH2_ACL; |
1194 | r.param.path2.operation = operation; | |
1195 | r.param.path2.filename1 = &buf1; | |
1196 | r.param.path2.filename2 = &buf2; | |
17fcfbd9 | 1197 | do { |
99a85259 TH |
1198 | tomoyo_check_acl(&r, tomoyo_check_path2_acl); |
1199 | error = tomoyo_audit_path2_log(&r); | |
1200 | } while (error == TOMOYO_RETRY_REQUEST); | |
b69a54ee | 1201 | out: |
c8c57e84 TH |
1202 | kfree(buf1.name); |
1203 | kfree(buf2.name); | |
fdb8ebb7 | 1204 | tomoyo_read_unlock(idx); |
cb0abe6a | 1205 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1206 | error = 0; |
1207 | return error; | |
1208 | } | |
a1f9bb6a TH |
1209 | |
1210 | /** | |
1211 | * tomoyo_write_file_policy - Update file related list. | |
1212 | * | |
1213 | * @data: String to parse. | |
1214 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1215 | * @is_delete: True if it is a delete request. | |
1216 | * | |
1217 | * Returns 0 on success, negative value otherwise. | |
1218 | * | |
1219 | * Caller holds tomoyo_read_lock(). | |
1220 | */ | |
1221 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
1222 | const bool is_delete) | |
1223 | { | |
1224 | char *w[5]; | |
1225 | u8 type; | |
1226 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
1227 | return -EINVAL; | |
237ab459 | 1228 | if (strncmp(w[0], "allow_", 6)) |
a1f9bb6a | 1229 | goto out; |
a1f9bb6a TH |
1230 | w[0] += 6; |
1231 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
1232 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
1233 | continue; | |
1234 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
1235 | } | |
1236 | if (!w[2][0]) | |
1237 | goto out; | |
1238 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
1239 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
1240 | continue; | |
1241 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
1242 | is_delete); | |
1243 | } | |
1244 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
1245 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
1246 | continue; | |
1247 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
1248 | is_delete); | |
1249 | } | |
1250 | if (!w[3][0] || !w[4][0]) | |
1251 | goto out; | |
75093152 TH |
1252 | for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) { |
1253 | if (strcmp(w[0], tomoyo_mkdev_keyword[type])) | |
a1f9bb6a | 1254 | continue; |
75093152 TH |
1255 | return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3], |
1256 | w[4], domain, is_delete); | |
a1f9bb6a TH |
1257 | } |
1258 | out: | |
1259 | return -EINVAL; | |
1260 | } |