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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, | |
e2bf6907 | 182 | tomoyo_pattern(filename)); |
99a85259 TH |
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, | |
e2bf6907 TH |
202 | tomoyo_pattern(filename1), |
203 | tomoyo_pattern(filename2)); | |
99a85259 TH |
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, | |
e2bf6907 | 225 | tomoyo_pattern(filename), mode, major, minor); |
99a85259 TH |
226 | } |
227 | ||
228 | /** | |
229 | * tomoyo_audit_path_number_log - Audit path/number request log. | |
230 | * | |
231 | * @r: Pointer to "struct tomoyo_request_info". | |
232 | * @error: Error code. | |
233 | * | |
234 | * Returns 0 on success, negative value otherwise. | |
235 | */ | |
236 | static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r) | |
237 | { | |
238 | const u8 type = r->param.path_number.operation; | |
239 | u8 radix; | |
240 | const struct tomoyo_path_info *filename = r->param.path_number.filename; | |
241 | const char *operation = tomoyo_path_number_keyword[type]; | |
242 | char buffer[64]; | |
243 | if (r->granted) | |
244 | return 0; | |
245 | switch (type) { | |
246 | case TOMOYO_TYPE_CREATE: | |
247 | case TOMOYO_TYPE_MKDIR: | |
248 | case TOMOYO_TYPE_MKFIFO: | |
249 | case TOMOYO_TYPE_MKSOCK: | |
250 | case TOMOYO_TYPE_CHMOD: | |
251 | radix = TOMOYO_VALUE_TYPE_OCTAL; | |
252 | break; | |
253 | case TOMOYO_TYPE_IOCTL: | |
254 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
255 | break; | |
256 | default: | |
257 | radix = TOMOYO_VALUE_TYPE_DECIMAL; | |
258 | break; | |
259 | } | |
260 | tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number, | |
261 | radix); | |
262 | tomoyo_warn_log(r, "%s %s %s", operation, filename->name, buffer); | |
263 | return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, | |
e2bf6907 | 264 | tomoyo_pattern(filename), buffer); |
99a85259 TH |
265 | } |
266 | ||
36f5e1ff TH |
267 | static bool tomoyo_same_globally_readable(const struct tomoyo_acl_head *a, |
268 | const struct tomoyo_acl_head *b) | |
269 | { | |
e2bf6907 | 270 | return container_of(a, struct tomoyo_readable_file, |
36f5e1ff | 271 | head)->filename == |
e2bf6907 | 272 | container_of(b, struct tomoyo_readable_file, |
36f5e1ff TH |
273 | head)->filename; |
274 | } | |
275 | ||
b69a54ee | 276 | /** |
e2bf6907 | 277 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_readable_file" list. |
b69a54ee KT |
278 | * |
279 | * @filename: Filename unconditionally permitted to open() for reading. | |
280 | * @is_delete: True if it is a delete request. | |
281 | * | |
282 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
283 | * |
284 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
285 | */ |
286 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
287 | const bool is_delete) | |
288 | { | |
e2bf6907 | 289 | struct tomoyo_readable_file e = { }; |
36f5e1ff | 290 | int error; |
b69a54ee | 291 | |
75093152 | 292 | if (!tomoyo_correct_word(filename)) |
b69a54ee | 293 | return -EINVAL; |
9e4b50e9 TH |
294 | e.filename = tomoyo_get_name(filename); |
295 | if (!e.filename) | |
b69a54ee | 296 | return -ENOMEM; |
36f5e1ff | 297 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
a230f9e7 TH |
298 | &tomoyo_policy_list |
299 | [TOMOYO_ID_GLOBALLY_READABLE], | |
36f5e1ff | 300 | tomoyo_same_globally_readable); |
9e4b50e9 | 301 | tomoyo_put_name(e.filename); |
b69a54ee KT |
302 | return error; |
303 | } | |
304 | ||
305 | /** | |
75093152 | 306 | * tomoyo_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. |
b69a54ee KT |
307 | * |
308 | * @filename: The filename to check. | |
309 | * | |
310 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
311 | * |
312 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 313 | */ |
75093152 | 314 | static bool tomoyo_globally_readable_file(const struct tomoyo_path_info * |
b69a54ee KT |
315 | filename) |
316 | { | |
e2bf6907 | 317 | struct tomoyo_readable_file *ptr; |
b69a54ee | 318 | bool found = false; |
fdb8ebb7 | 319 | |
a230f9e7 TH |
320 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list |
321 | [TOMOYO_ID_GLOBALLY_READABLE], head.list) { | |
82e0f001 | 322 | if (!ptr->head.is_deleted && |
b69a54ee KT |
323 | tomoyo_path_matches_pattern(filename, ptr->filename)) { |
324 | found = true; | |
325 | break; | |
326 | } | |
327 | } | |
b69a54ee KT |
328 | return found; |
329 | } | |
330 | ||
331 | /** | |
e2bf6907 | 332 | * tomoyo_write_globally_readable - Write "struct tomoyo_readable_file" list. |
b69a54ee KT |
333 | * |
334 | * @data: String to parse. | |
335 | * @is_delete: True if it is a delete request. | |
336 | * | |
337 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
338 | * |
339 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 340 | */ |
e2bf6907 | 341 | int tomoyo_write_globally_readable(char *data, const bool is_delete) |
b69a54ee KT |
342 | { |
343 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
344 | } | |
345 | ||
36f5e1ff TH |
346 | static bool tomoyo_same_pattern(const struct tomoyo_acl_head *a, |
347 | const struct tomoyo_acl_head *b) | |
348 | { | |
e2bf6907 TH |
349 | return container_of(a, struct tomoyo_no_pattern, head)->pattern == |
350 | container_of(b, struct tomoyo_no_pattern, head)->pattern; | |
36f5e1ff TH |
351 | } |
352 | ||
b69a54ee | 353 | /** |
e2bf6907 | 354 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_no_pattern" list. |
b69a54ee KT |
355 | * |
356 | * @pattern: Pathname pattern. | |
357 | * @is_delete: True if it is a delete request. | |
358 | * | |
359 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
360 | * |
361 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
362 | */ |
363 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
364 | const bool is_delete) | |
365 | { | |
e2bf6907 | 366 | struct tomoyo_no_pattern e = { }; |
36f5e1ff | 367 | int error; |
b69a54ee | 368 | |
75093152 | 369 | if (!tomoyo_correct_word(pattern)) |
3f629636 TH |
370 | return -EINVAL; |
371 | e.pattern = tomoyo_get_name(pattern); | |
9e4b50e9 | 372 | if (!e.pattern) |
36f5e1ff TH |
373 | return -ENOMEM; |
374 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
a230f9e7 | 375 | &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
36f5e1ff | 376 | tomoyo_same_pattern); |
9e4b50e9 | 377 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
378 | return error; |
379 | } | |
380 | ||
381 | /** | |
e2bf6907 | 382 | * tomoyo_pattern - Get patterned pathname. |
b69a54ee KT |
383 | * |
384 | * @filename: The filename to find patterned pathname. | |
385 | * | |
386 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
387 | * |
388 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 389 | */ |
e2bf6907 | 390 | const char *tomoyo_pattern(const struct tomoyo_path_info *filename) |
b69a54ee | 391 | { |
e2bf6907 | 392 | struct tomoyo_no_pattern *ptr; |
b69a54ee KT |
393 | const struct tomoyo_path_info *pattern = NULL; |
394 | ||
a230f9e7 TH |
395 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_PATTERN], |
396 | head.list) { | |
82e0f001 | 397 | if (ptr->head.is_deleted) |
b69a54ee KT |
398 | continue; |
399 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
400 | continue; | |
401 | pattern = ptr->pattern; | |
402 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
403 | /* Do nothing. Try to find the better match. */ | |
404 | } else { | |
405 | /* This would be the better match. Use this. */ | |
406 | break; | |
407 | } | |
408 | } | |
b69a54ee KT |
409 | if (pattern) |
410 | filename = pattern; | |
17fcfbd9 | 411 | return filename->name; |
b69a54ee KT |
412 | } |
413 | ||
414 | /** | |
e2bf6907 | 415 | * tomoyo_write_pattern - Write "struct tomoyo_no_pattern" list. |
b69a54ee KT |
416 | * |
417 | * @data: String to parse. | |
418 | * @is_delete: True if it is a delete request. | |
419 | * | |
420 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
421 | * |
422 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 423 | */ |
e2bf6907 | 424 | int tomoyo_write_pattern(char *data, const bool is_delete) |
b69a54ee KT |
425 | { |
426 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
427 | } | |
428 | ||
36f5e1ff TH |
429 | static bool tomoyo_same_no_rewrite(const struct tomoyo_acl_head *a, |
430 | const struct tomoyo_acl_head *b) | |
431 | { | |
e2bf6907 TH |
432 | return container_of(a, struct tomoyo_no_rewrite, head)->pattern |
433 | == container_of(b, struct tomoyo_no_rewrite, head) | |
36f5e1ff TH |
434 | ->pattern; |
435 | } | |
436 | ||
b69a54ee | 437 | /** |
e2bf6907 | 438 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite" list. |
b69a54ee KT |
439 | * |
440 | * @pattern: Pathname pattern that are not rewritable by default. | |
441 | * @is_delete: True if it is a delete request. | |
442 | * | |
443 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
444 | * |
445 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
446 | */ |
447 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
448 | const bool is_delete) | |
449 | { | |
e2bf6907 | 450 | struct tomoyo_no_rewrite e = { }; |
36f5e1ff | 451 | int error; |
b69a54ee | 452 | |
75093152 | 453 | if (!tomoyo_correct_word(pattern)) |
b69a54ee | 454 | return -EINVAL; |
9e4b50e9 TH |
455 | e.pattern = tomoyo_get_name(pattern); |
456 | if (!e.pattern) | |
36f5e1ff TH |
457 | return -ENOMEM; |
458 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
a230f9e7 | 459 | &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
36f5e1ff | 460 | tomoyo_same_no_rewrite); |
9e4b50e9 | 461 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
462 | return error; |
463 | } | |
464 | ||
465 | /** | |
75093152 | 466 | * tomoyo_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. |
b69a54ee KT |
467 | * |
468 | * @filename: Filename to check. | |
469 | * | |
470 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
471 | * false otherwise. | |
fdb8ebb7 TH |
472 | * |
473 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 474 | */ |
75093152 | 475 | static bool tomoyo_no_rewrite_file(const struct tomoyo_path_info *filename) |
b69a54ee | 476 | { |
e2bf6907 | 477 | struct tomoyo_no_rewrite *ptr; |
b69a54ee KT |
478 | bool found = false; |
479 | ||
a230f9e7 TH |
480 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE], |
481 | head.list) { | |
82e0f001 | 482 | if (ptr->head.is_deleted) |
b69a54ee KT |
483 | continue; |
484 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
485 | continue; | |
486 | found = true; | |
487 | break; | |
488 | } | |
b69a54ee KT |
489 | return found; |
490 | } | |
491 | ||
492 | /** | |
e2bf6907 | 493 | * tomoyo_write_no_rewrite - Write "struct tomoyo_no_rewrite" list. |
b69a54ee KT |
494 | * |
495 | * @data: String to parse. | |
496 | * @is_delete: True if it is a delete request. | |
497 | * | |
498 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
499 | * |
500 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 501 | */ |
e2bf6907 | 502 | int tomoyo_write_no_rewrite(char *data, const bool is_delete) |
b69a54ee KT |
503 | { |
504 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
505 | } | |
506 | ||
99a85259 TH |
507 | static bool tomoyo_check_path_acl(const struct tomoyo_request_info *r, |
508 | const struct tomoyo_acl_info *ptr) | |
b69a54ee | 509 | { |
99a85259 TH |
510 | const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl), |
511 | head); | |
512 | return (acl->perm & (1 << r->param.path.operation)) && | |
513 | tomoyo_compare_name_union(r->param.path.filename, &acl->name); | |
514 | } | |
b69a54ee | 515 | |
99a85259 TH |
516 | static bool tomoyo_check_path_number_acl(const struct tomoyo_request_info *r, |
517 | const struct tomoyo_acl_info *ptr) | |
518 | { | |
519 | const struct tomoyo_path_number_acl *acl = | |
520 | container_of(ptr, typeof(*acl), head); | |
521 | return (acl->perm & (1 << r->param.path_number.operation)) && | |
522 | tomoyo_compare_number_union(r->param.path_number.number, | |
523 | &acl->number) && | |
524 | tomoyo_compare_name_union(r->param.path_number.filename, | |
525 | &acl->name); | |
526 | } | |
527 | ||
528 | static bool tomoyo_check_path2_acl(const struct tomoyo_request_info *r, | |
529 | const struct tomoyo_acl_info *ptr) | |
530 | { | |
531 | const struct tomoyo_path2_acl *acl = | |
532 | container_of(ptr, typeof(*acl), head); | |
533 | return (acl->perm & (1 << r->param.path2.operation)) && | |
534 | tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1) | |
535 | && tomoyo_compare_name_union(r->param.path2.filename2, | |
536 | &acl->name2); | |
537 | } | |
538 | ||
539 | static bool tomoyo_check_mkdev_acl(const struct tomoyo_request_info *r, | |
540 | const struct tomoyo_acl_info *ptr) | |
541 | { | |
75093152 | 542 | const struct tomoyo_mkdev_acl *acl = |
99a85259 TH |
543 | container_of(ptr, typeof(*acl), head); |
544 | return (acl->perm & (1 << r->param.mkdev.operation)) && | |
545 | tomoyo_compare_number_union(r->param.mkdev.mode, | |
546 | &acl->mode) && | |
547 | tomoyo_compare_number_union(r->param.mkdev.major, | |
548 | &acl->major) && | |
549 | tomoyo_compare_number_union(r->param.mkdev.minor, | |
550 | &acl->minor) && | |
551 | tomoyo_compare_name_union(r->param.mkdev.filename, | |
552 | &acl->name); | |
b69a54ee KT |
553 | } |
554 | ||
237ab459 TH |
555 | static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, |
556 | const struct tomoyo_acl_info *b) | |
557 | { | |
558 | const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); | |
559 | const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
560 | return tomoyo_same_acl_head(&p1->head, &p2->head) && |
561 | tomoyo_same_name_union(&p1->name, &p2->name); | |
237ab459 TH |
562 | } |
563 | ||
564 | static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, | |
565 | struct tomoyo_acl_info *b, | |
566 | const bool is_delete) | |
567 | { | |
568 | u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head) | |
569 | ->perm; | |
570 | u16 perm = *a_perm; | |
571 | const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; | |
572 | if (is_delete) { | |
573 | perm &= ~b_perm; | |
574 | if ((perm & TOMOYO_RW_MASK) != TOMOYO_RW_MASK) | |
575 | perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); | |
576 | else if (!(perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
577 | perm &= ~TOMOYO_RW_MASK; | |
578 | } else { | |
579 | perm |= b_perm; | |
580 | if ((perm & TOMOYO_RW_MASK) == TOMOYO_RW_MASK) | |
581 | perm |= (1 << TOMOYO_TYPE_READ_WRITE); | |
582 | else if (perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
583 | perm |= TOMOYO_RW_MASK; | |
584 | } | |
585 | *a_perm = perm; | |
586 | return !perm; | |
587 | } | |
588 | ||
b69a54ee | 589 | /** |
7ef61233 | 590 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
591 | * |
592 | * @type: Type of operation. | |
593 | * @filename: Filename. | |
594 | * @domain: Pointer to "struct tomoyo_domain_info". | |
595 | * @is_delete: True if it is a delete request. | |
596 | * | |
597 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
598 | * |
599 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 600 | */ |
7ef61233 | 601 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
237ab459 | 602 | struct tomoyo_domain_info * const domain, |
7ef61233 | 603 | const bool is_delete) |
b69a54ee | 604 | { |
9e4b50e9 TH |
605 | struct tomoyo_path_acl e = { |
606 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
237ab459 | 607 | .perm = 1 << type |
9e4b50e9 | 608 | }; |
237ab459 TH |
609 | int error; |
610 | if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE)) | |
611 | e.perm |= TOMOYO_RW_MASK; | |
7762fbff | 612 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 613 | return -EINVAL; |
237ab459 TH |
614 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
615 | tomoyo_same_path_acl, | |
616 | tomoyo_merge_path_acl); | |
7762fbff | 617 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
618 | return error; |
619 | } | |
620 | ||
75093152 | 621 | static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a, |
237ab459 TH |
622 | const struct tomoyo_acl_info *b) |
623 | { | |
75093152 | 624 | const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), |
237ab459 | 625 | head); |
75093152 | 626 | const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), |
237ab459 | 627 | head); |
75093152 TH |
628 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
629 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
630 | && tomoyo_same_number_union(&p1->mode, &p2->mode) | |
631 | && tomoyo_same_number_union(&p1->major, &p2->major) | |
632 | && tomoyo_same_number_union(&p1->minor, &p2->minor); | |
237ab459 TH |
633 | } |
634 | ||
75093152 | 635 | static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, |
237ab459 TH |
636 | struct tomoyo_acl_info *b, |
637 | const bool is_delete) | |
638 | { | |
75093152 | 639 | u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl, |
237ab459 TH |
640 | head)->perm; |
641 | u8 perm = *a_perm; | |
75093152 | 642 | const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head) |
237ab459 TH |
643 | ->perm; |
644 | if (is_delete) | |
645 | perm &= ~b_perm; | |
646 | else | |
647 | perm |= b_perm; | |
648 | *a_perm = perm; | |
649 | return !perm; | |
650 | } | |
651 | ||
a1f9bb6a | 652 | /** |
75093152 | 653 | * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list. |
a1f9bb6a TH |
654 | * |
655 | * @type: Type of operation. | |
656 | * @filename: Filename. | |
657 | * @mode: Create mode. | |
658 | * @major: Device major number. | |
659 | * @minor: Device minor number. | |
660 | * @domain: Pointer to "struct tomoyo_domain_info". | |
661 | * @is_delete: True if it is a delete request. | |
662 | * | |
663 | * Returns 0 on success, negative value otherwise. | |
237ab459 TH |
664 | * |
665 | * Caller holds tomoyo_read_lock(). | |
a1f9bb6a | 666 | */ |
75093152 | 667 | static int tomoyo_update_mkdev_acl(const u8 type, const char *filename, |
237ab459 TH |
668 | char *mode, char *major, char *minor, |
669 | struct tomoyo_domain_info * const | |
670 | domain, const bool is_delete) | |
a1f9bb6a | 671 | { |
75093152 TH |
672 | struct tomoyo_mkdev_acl e = { |
673 | .head.type = TOMOYO_TYPE_MKDEV_ACL, | |
237ab459 | 674 | .perm = 1 << type |
a1f9bb6a TH |
675 | }; |
676 | int error = is_delete ? -ENOENT : -ENOMEM; | |
677 | if (!tomoyo_parse_name_union(filename, &e.name) || | |
678 | !tomoyo_parse_number_union(mode, &e.mode) || | |
679 | !tomoyo_parse_number_union(major, &e.major) || | |
680 | !tomoyo_parse_number_union(minor, &e.minor)) | |
681 | goto out; | |
237ab459 | 682 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
75093152 TH |
683 | tomoyo_same_mkdev_acl, |
684 | tomoyo_merge_mkdev_acl); | |
a1f9bb6a TH |
685 | out: |
686 | tomoyo_put_name_union(&e.name); | |
687 | tomoyo_put_number_union(&e.mode); | |
688 | tomoyo_put_number_union(&e.major); | |
689 | tomoyo_put_number_union(&e.minor); | |
690 | return error; | |
691 | } | |
692 | ||
237ab459 TH |
693 | static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, |
694 | const struct tomoyo_acl_info *b) | |
695 | { | |
696 | const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); | |
697 | const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
698 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
699 | && tomoyo_same_name_union(&p1->name1, &p2->name1) | |
700 | && tomoyo_same_name_union(&p1->name2, &p2->name2); | |
237ab459 TH |
701 | } |
702 | ||
703 | static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a, | |
704 | struct tomoyo_acl_info *b, | |
705 | const bool is_delete) | |
706 | { | |
707 | u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head) | |
708 | ->perm; | |
709 | u8 perm = *a_perm; | |
710 | const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm; | |
711 | if (is_delete) | |
712 | perm &= ~b_perm; | |
713 | else | |
714 | perm |= b_perm; | |
715 | *a_perm = perm; | |
716 | return !perm; | |
717 | } | |
718 | ||
b69a54ee | 719 | /** |
7ef61233 | 720 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
721 | * |
722 | * @type: Type of operation. | |
723 | * @filename1: First filename. | |
724 | * @filename2: Second filename. | |
725 | * @domain: Pointer to "struct tomoyo_domain_info". | |
726 | * @is_delete: True if it is a delete request. | |
727 | * | |
728 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
729 | * |
730 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 731 | */ |
7ef61233 TH |
732 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
733 | const char *filename2, | |
237ab459 | 734 | struct tomoyo_domain_info * const domain, |
7ef61233 | 735 | const bool is_delete) |
b69a54ee | 736 | { |
9e4b50e9 TH |
737 | struct tomoyo_path2_acl e = { |
738 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
237ab459 | 739 | .perm = 1 << type |
9e4b50e9 | 740 | }; |
ca0b7df3 | 741 | int error = is_delete ? -ENOENT : -ENOMEM; |
7762fbff TH |
742 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
743 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 744 | goto out; |
237ab459 TH |
745 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
746 | tomoyo_same_path2_acl, | |
747 | tomoyo_merge_path2_acl); | |
ca0b7df3 | 748 | out: |
7762fbff TH |
749 | tomoyo_put_name_union(&e.name1); |
750 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
751 | return error; |
752 | } | |
753 | ||
b69a54ee | 754 | /** |
cb0abe6a | 755 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 756 | * |
cb0abe6a | 757 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
758 | * @operation: Type of operation. |
759 | * @filename: Filename to check. | |
b69a54ee KT |
760 | * |
761 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
762 | * |
763 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 764 | */ |
05336dee TH |
765 | int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
766 | const struct tomoyo_path_info *filename) | |
b69a54ee | 767 | { |
b69a54ee | 768 | int error; |
b69a54ee | 769 | |
b69a54ee | 770 | next: |
57c2590f TH |
771 | r->type = tomoyo_p2mac[operation]; |
772 | r->mode = tomoyo_get_mode(r->profile, r->type); | |
773 | if (r->mode == TOMOYO_CONFIG_DISABLED) | |
774 | return 0; | |
cf6e9a64 TH |
775 | r->param_type = TOMOYO_TYPE_PATH_ACL; |
776 | r->param.path.filename = filename; | |
777 | r->param.path.operation = operation; | |
17fcfbd9 | 778 | do { |
99a85259 TH |
779 | tomoyo_check_acl(r, tomoyo_check_path_acl); |
780 | if (!r->granted && operation == TOMOYO_TYPE_READ && | |
05336dee | 781 | !r->domain->ignore_global_allow_read && |
75093152 | 782 | tomoyo_globally_readable_file(filename)) |
99a85259 TH |
783 | r->granted = true; |
784 | error = tomoyo_audit_path_log(r); | |
05336dee TH |
785 | /* |
786 | * Do not retry for execute request, for alias may have | |
787 | * changed. | |
788 | */ | |
789 | } while (error == TOMOYO_RETRY_REQUEST && | |
790 | operation != TOMOYO_TYPE_EXECUTE); | |
b69a54ee KT |
791 | /* |
792 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
793 | * we need to check "allow_rewrite" permission if the filename is | |
794 | * specified by "deny_rewrite" keyword. | |
795 | */ | |
7ef61233 | 796 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
75093152 | 797 | tomoyo_no_rewrite_file(filename)) { |
7ef61233 | 798 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
799 | goto next; |
800 | } | |
801 | return error; | |
802 | } | |
803 | ||
237ab459 TH |
804 | static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, |
805 | const struct tomoyo_acl_info *b) | |
806 | { | |
807 | const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1), | |
808 | head); | |
809 | const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), | |
810 | head); | |
75093152 TH |
811 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
812 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
813 | && tomoyo_same_number_union(&p1->number, &p2->number); | |
237ab459 TH |
814 | } |
815 | ||
816 | static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, | |
817 | struct tomoyo_acl_info *b, | |
818 | const bool is_delete) | |
819 | { | |
820 | u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl, | |
821 | head)->perm; | |
822 | u8 perm = *a_perm; | |
823 | const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head) | |
824 | ->perm; | |
825 | if (is_delete) | |
826 | perm &= ~b_perm; | |
827 | else | |
828 | perm |= b_perm; | |
829 | *a_perm = perm; | |
830 | return !perm; | |
831 | } | |
832 | ||
a1f9bb6a TH |
833 | /** |
834 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. | |
835 | * | |
836 | * @type: Type of operation. | |
837 | * @filename: Filename. | |
838 | * @number: Number. | |
839 | * @domain: Pointer to "struct tomoyo_domain_info". | |
840 | * @is_delete: True if it is a delete request. | |
841 | * | |
842 | * Returns 0 on success, negative value otherwise. | |
843 | */ | |
237ab459 TH |
844 | static int tomoyo_update_path_number_acl(const u8 type, const char *filename, |
845 | char *number, | |
846 | struct tomoyo_domain_info * const | |
847 | domain, | |
848 | const bool is_delete) | |
a1f9bb6a | 849 | { |
a1f9bb6a TH |
850 | struct tomoyo_path_number_acl e = { |
851 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
237ab459 | 852 | .perm = 1 << type |
a1f9bb6a TH |
853 | }; |
854 | int error = is_delete ? -ENOENT : -ENOMEM; | |
a1f9bb6a TH |
855 | if (!tomoyo_parse_name_union(filename, &e.name)) |
856 | return -EINVAL; | |
857 | if (!tomoyo_parse_number_union(number, &e.number)) | |
858 | goto out; | |
237ab459 TH |
859 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
860 | tomoyo_same_path_number_acl, | |
861 | tomoyo_merge_path_number_acl); | |
a1f9bb6a TH |
862 | out: |
863 | tomoyo_put_name_union(&e.name); | |
864 | tomoyo_put_number_union(&e.number); | |
865 | return error; | |
866 | } | |
867 | ||
a1f9bb6a TH |
868 | /** |
869 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
870 | * | |
871 | * @type: Type of operation. | |
872 | * @path: Pointer to "struct path". | |
873 | * @number: Number. | |
874 | * | |
875 | * Returns 0 on success, negative value otherwise. | |
876 | */ | |
877 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
878 | unsigned long number) | |
879 | { | |
880 | struct tomoyo_request_info r; | |
881 | int error = -ENOMEM; | |
c8c57e84 | 882 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
883 | int idx; |
884 | ||
57c2590f TH |
885 | if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
886 | == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) | |
a1f9bb6a TH |
887 | return 0; |
888 | idx = tomoyo_read_lock(); | |
c8c57e84 | 889 | if (!tomoyo_get_realpath(&buf, path)) |
a1f9bb6a | 890 | goto out; |
c8c57e84 TH |
891 | if (type == TOMOYO_TYPE_MKDIR) |
892 | tomoyo_add_slash(&buf); | |
cb917cf5 TH |
893 | r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL; |
894 | r.param.path_number.operation = type; | |
895 | r.param.path_number.filename = &buf; | |
896 | r.param.path_number.number = number; | |
897 | do { | |
898 | tomoyo_check_acl(&r, tomoyo_check_path_number_acl); | |
899 | error = tomoyo_audit_path_number_log(&r); | |
900 | } while (error == TOMOYO_RETRY_REQUEST); | |
c8c57e84 | 901 | kfree(buf.name); |
cb917cf5 | 902 | out: |
a1f9bb6a TH |
903 | tomoyo_read_unlock(idx); |
904 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
905 | error = 0; | |
906 | return error; | |
907 | } | |
908 | ||
b69a54ee KT |
909 | /** |
910 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
911 | * | |
912 | * @domain: Pointer to "struct tomoyo_domain_info". | |
913 | * @path: Pointer to "struct path". | |
914 | * @flag: Flags for open(). | |
915 | * | |
916 | * Returns 0 on success, negative value otherwise. | |
917 | */ | |
918 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
919 | struct path *path, const int flag) | |
920 | { | |
921 | const u8 acc_mode = ACC_MODE(flag); | |
922 | int error = -ENOMEM; | |
c8c57e84 | 923 | struct tomoyo_path_info buf; |
cb0abe6a | 924 | struct tomoyo_request_info r; |
fdb8ebb7 | 925 | int idx; |
b69a54ee | 926 | |
57c2590f TH |
927 | if (!path->mnt || |
928 | (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))) | |
b69a54ee | 929 | return 0; |
57c2590f TH |
930 | buf.name = NULL; |
931 | r.mode = TOMOYO_CONFIG_DISABLED; | |
fdb8ebb7 | 932 | idx = tomoyo_read_lock(); |
c8c57e84 | 933 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
934 | goto out; |
935 | error = 0; | |
936 | /* | |
937 | * If the filename is specified by "deny_rewrite" keyword, | |
938 | * we need to check "allow_rewrite" permission when the filename is not | |
939 | * opened for append mode or the filename is truncated at open time. | |
940 | */ | |
57c2590f TH |
941 | if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND) |
942 | && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE) | |
943 | != TOMOYO_CONFIG_DISABLED) { | |
944 | if (!tomoyo_get_realpath(&buf, path)) { | |
945 | error = -ENOMEM; | |
946 | goto out; | |
947 | } | |
75093152 | 948 | if (tomoyo_no_rewrite_file(&buf)) |
57c2590f TH |
949 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, |
950 | &buf); | |
b69a54ee | 951 | } |
57c2590f TH |
952 | if (!error && acc_mode && |
953 | tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) | |
954 | != TOMOYO_CONFIG_DISABLED) { | |
05336dee | 955 | u8 operation; |
57c2590f TH |
956 | if (!buf.name && !tomoyo_get_realpath(&buf, path)) { |
957 | error = -ENOMEM; | |
958 | goto out; | |
959 | } | |
05336dee TH |
960 | if (acc_mode == (MAY_READ | MAY_WRITE)) |
961 | operation = TOMOYO_TYPE_READ_WRITE; | |
962 | else if (acc_mode == MAY_READ) | |
963 | operation = TOMOYO_TYPE_READ; | |
964 | else | |
965 | operation = TOMOYO_TYPE_WRITE; | |
966 | error = tomoyo_path_permission(&r, operation, &buf); | |
57c2590f | 967 | } |
b69a54ee | 968 | out: |
c8c57e84 | 969 | kfree(buf.name); |
fdb8ebb7 | 970 | tomoyo_read_unlock(idx); |
cb0abe6a | 971 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
972 | error = 0; |
973 | return error; | |
974 | } | |
975 | ||
976 | /** | |
2106ccd9 | 977 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
b69a54ee | 978 | * |
b69a54ee KT |
979 | * @operation: Type of operation. |
980 | * @path: Pointer to "struct path". | |
981 | * | |
982 | * Returns 0 on success, negative value otherwise. | |
983 | */ | |
97d6931e | 984 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
985 | { |
986 | int error = -ENOMEM; | |
c8c57e84 | 987 | struct tomoyo_path_info buf; |
cb0abe6a | 988 | struct tomoyo_request_info r; |
fdb8ebb7 | 989 | int idx; |
b69a54ee | 990 | |
57c2590f TH |
991 | if (!path->mnt) |
992 | return 0; | |
993 | if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) | |
994 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 995 | return 0; |
57c2590f | 996 | buf.name = NULL; |
fdb8ebb7 | 997 | idx = tomoyo_read_lock(); |
c8c57e84 | 998 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
999 | goto out; |
1000 | switch (operation) { | |
cb0abe6a | 1001 | case TOMOYO_TYPE_REWRITE: |
75093152 | 1002 | if (!tomoyo_no_rewrite_file(&buf)) { |
cb0abe6a TH |
1003 | error = 0; |
1004 | goto out; | |
1005 | } | |
1006 | break; | |
7ef61233 TH |
1007 | case TOMOYO_TYPE_RMDIR: |
1008 | case TOMOYO_TYPE_CHROOT: | |
57c2590f | 1009 | case TOMOYO_TYPE_UMOUNT: |
c8c57e84 TH |
1010 | tomoyo_add_slash(&buf); |
1011 | break; | |
b69a54ee | 1012 | } |
c8c57e84 | 1013 | error = tomoyo_path_permission(&r, operation, &buf); |
b69a54ee | 1014 | out: |
c8c57e84 | 1015 | kfree(buf.name); |
fdb8ebb7 | 1016 | tomoyo_read_unlock(idx); |
cb0abe6a | 1017 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1018 | error = 0; |
1019 | return error; | |
1020 | } | |
1021 | ||
a1f9bb6a | 1022 | /** |
75093152 | 1023 | * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar". |
a1f9bb6a TH |
1024 | * |
1025 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
1026 | * @path: Pointer to "struct path". | |
1027 | * @mode: Create mode. | |
1028 | * @dev: Device number. | |
1029 | * | |
1030 | * Returns 0 on success, negative value otherwise. | |
1031 | */ | |
75093152 | 1032 | int tomoyo_mkdev_perm(const u8 operation, struct path *path, |
a1f9bb6a TH |
1033 | const unsigned int mode, unsigned int dev) |
1034 | { | |
1035 | struct tomoyo_request_info r; | |
1036 | int error = -ENOMEM; | |
c8c57e84 | 1037 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1038 | int idx; |
1039 | ||
57c2590f TH |
1040 | if (!path->mnt || |
1041 | tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) | |
1042 | == TOMOYO_CONFIG_DISABLED) | |
a1f9bb6a TH |
1043 | return 0; |
1044 | idx = tomoyo_read_lock(); | |
1045 | error = -ENOMEM; | |
c8c57e84 | 1046 | if (tomoyo_get_realpath(&buf, path)) { |
cf6e9a64 | 1047 | dev = new_decode_dev(dev); |
75093152 | 1048 | r.param_type = TOMOYO_TYPE_MKDEV_ACL; |
cf6e9a64 TH |
1049 | r.param.mkdev.filename = &buf; |
1050 | r.param.mkdev.operation = operation; | |
1051 | r.param.mkdev.mode = mode; | |
1052 | r.param.mkdev.major = MAJOR(dev); | |
1053 | r.param.mkdev.minor = MINOR(dev); | |
99a85259 TH |
1054 | tomoyo_check_acl(&r, tomoyo_check_mkdev_acl); |
1055 | error = tomoyo_audit_mkdev_log(&r); | |
c8c57e84 | 1056 | kfree(buf.name); |
a1f9bb6a TH |
1057 | } |
1058 | tomoyo_read_unlock(idx); | |
1059 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1060 | error = 0; | |
1061 | return error; | |
1062 | } | |
1063 | ||
b69a54ee | 1064 | /** |
7ef61233 | 1065 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1066 | * |
b69a54ee KT |
1067 | * @operation: Type of operation. |
1068 | * @path1: Pointer to "struct path". | |
1069 | * @path2: Pointer to "struct path". | |
1070 | * | |
1071 | * Returns 0 on success, negative value otherwise. | |
1072 | */ | |
97d6931e | 1073 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1074 | struct path *path2) |
b69a54ee KT |
1075 | { |
1076 | int error = -ENOMEM; | |
c8c57e84 TH |
1077 | struct tomoyo_path_info buf1; |
1078 | struct tomoyo_path_info buf2; | |
cb0abe6a | 1079 | struct tomoyo_request_info r; |
fdb8ebb7 | 1080 | int idx; |
b69a54ee | 1081 | |
57c2590f TH |
1082 | if (!path1->mnt || !path2->mnt || |
1083 | tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) | |
1084 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1085 | return 0; |
c8c57e84 TH |
1086 | buf1.name = NULL; |
1087 | buf2.name = NULL; | |
fdb8ebb7 | 1088 | idx = tomoyo_read_lock(); |
c8c57e84 TH |
1089 | if (!tomoyo_get_realpath(&buf1, path1) || |
1090 | !tomoyo_get_realpath(&buf2, path2)) | |
b69a54ee | 1091 | goto out; |
57c2590f TH |
1092 | switch (operation) { |
1093 | struct dentry *dentry; | |
1094 | case TOMOYO_TYPE_RENAME: | |
1095 | case TOMOYO_TYPE_LINK: | |
1096 | dentry = path1->dentry; | |
1097 | if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) | |
1098 | break; | |
1099 | /* fall through */ | |
1100 | case TOMOYO_TYPE_PIVOT_ROOT: | |
1101 | tomoyo_add_slash(&buf1); | |
1102 | tomoyo_add_slash(&buf2); | |
1103 | break; | |
1104 | } | |
cf6e9a64 TH |
1105 | r.param_type = TOMOYO_TYPE_PATH2_ACL; |
1106 | r.param.path2.operation = operation; | |
1107 | r.param.path2.filename1 = &buf1; | |
1108 | r.param.path2.filename2 = &buf2; | |
17fcfbd9 | 1109 | do { |
99a85259 TH |
1110 | tomoyo_check_acl(&r, tomoyo_check_path2_acl); |
1111 | error = tomoyo_audit_path2_log(&r); | |
1112 | } while (error == TOMOYO_RETRY_REQUEST); | |
b69a54ee | 1113 | out: |
c8c57e84 TH |
1114 | kfree(buf1.name); |
1115 | kfree(buf2.name); | |
fdb8ebb7 | 1116 | tomoyo_read_unlock(idx); |
cb0abe6a | 1117 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1118 | error = 0; |
1119 | return error; | |
1120 | } | |
a1f9bb6a TH |
1121 | |
1122 | /** | |
e2bf6907 | 1123 | * tomoyo_write_file - Update file related list. |
a1f9bb6a TH |
1124 | * |
1125 | * @data: String to parse. | |
1126 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1127 | * @is_delete: True if it is a delete request. | |
1128 | * | |
1129 | * Returns 0 on success, negative value otherwise. | |
1130 | * | |
1131 | * Caller holds tomoyo_read_lock(). | |
1132 | */ | |
e2bf6907 TH |
1133 | int tomoyo_write_file(char *data, struct tomoyo_domain_info *domain, |
1134 | const bool is_delete) | |
a1f9bb6a TH |
1135 | { |
1136 | char *w[5]; | |
1137 | u8 type; | |
1138 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
1139 | return -EINVAL; | |
237ab459 | 1140 | if (strncmp(w[0], "allow_", 6)) |
a1f9bb6a | 1141 | goto out; |
a1f9bb6a TH |
1142 | w[0] += 6; |
1143 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
1144 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
1145 | continue; | |
1146 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
1147 | } | |
1148 | if (!w[2][0]) | |
1149 | goto out; | |
1150 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
1151 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
1152 | continue; | |
1153 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
1154 | is_delete); | |
1155 | } | |
1156 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
1157 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
1158 | continue; | |
1159 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
1160 | is_delete); | |
1161 | } | |
1162 | if (!w[3][0] || !w[4][0]) | |
1163 | goto out; | |
75093152 TH |
1164 | for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) { |
1165 | if (strcmp(w[0], tomoyo_mkdev_keyword[type])) | |
a1f9bb6a | 1166 | continue; |
75093152 TH |
1167 | return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3], |
1168 | w[4], domain, is_delete); | |
a1f9bb6a TH |
1169 | } |
1170 | out: | |
1171 | return -EINVAL; | |
1172 | } |