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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. */ |
7ef61233 TH |
13 | static const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { |
14 | [TOMOYO_TYPE_READ_WRITE] = "read/write", | |
15 | [TOMOYO_TYPE_EXECUTE] = "execute", | |
16 | [TOMOYO_TYPE_READ] = "read", | |
17 | [TOMOYO_TYPE_WRITE] = "write", | |
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 TH |
27 | /* Keyword array for operations with one pathname and three numbers. */ |
28 | static const char *tomoyo_path_number3_keyword | |
29 | [TOMOYO_MAX_PATH_NUMBER3_OPERATION] = { | |
30 | [TOMOYO_TYPE_MKBLOCK] = "mkblock", | |
31 | [TOMOYO_TYPE_MKCHAR] = "mkchar", | |
32 | }; | |
33 | ||
34 | /* Keyword array for operations with two pathnames. */ | |
7ef61233 | 35 | static const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { |
a1f9bb6a TH |
36 | [TOMOYO_TYPE_LINK] = "link", |
37 | [TOMOYO_TYPE_RENAME] = "rename", | |
7ef61233 | 38 | [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", |
b69a54ee KT |
39 | }; |
40 | ||
a1f9bb6a TH |
41 | /* Keyword array for operations with one pathname and one number. */ |
42 | static const char *tomoyo_path_number_keyword | |
43 | [TOMOYO_MAX_PATH_NUMBER_OPERATION] = { | |
44 | [TOMOYO_TYPE_CREATE] = "create", | |
45 | [TOMOYO_TYPE_MKDIR] = "mkdir", | |
46 | [TOMOYO_TYPE_MKFIFO] = "mkfifo", | |
47 | [TOMOYO_TYPE_MKSOCK] = "mksock", | |
48 | [TOMOYO_TYPE_IOCTL] = "ioctl", | |
49 | [TOMOYO_TYPE_CHMOD] = "chmod", | |
50 | [TOMOYO_TYPE_CHOWN] = "chown", | |
51 | [TOMOYO_TYPE_CHGRP] = "chgrp", | |
52 | }; | |
53 | ||
57c2590f TH |
54 | static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = { |
55 | [TOMOYO_TYPE_READ_WRITE] = TOMOYO_MAC_FILE_OPEN, | |
56 | [TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE, | |
57 | [TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN, | |
58 | [TOMOYO_TYPE_WRITE] = TOMOYO_MAC_FILE_OPEN, | |
59 | [TOMOYO_TYPE_UNLINK] = TOMOYO_MAC_FILE_UNLINK, | |
60 | [TOMOYO_TYPE_RMDIR] = TOMOYO_MAC_FILE_RMDIR, | |
61 | [TOMOYO_TYPE_TRUNCATE] = TOMOYO_MAC_FILE_TRUNCATE, | |
62 | [TOMOYO_TYPE_SYMLINK] = TOMOYO_MAC_FILE_SYMLINK, | |
63 | [TOMOYO_TYPE_REWRITE] = TOMOYO_MAC_FILE_REWRITE, | |
64 | [TOMOYO_TYPE_CHROOT] = TOMOYO_MAC_FILE_CHROOT, | |
65 | [TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT, | |
66 | }; | |
67 | ||
68 | static const u8 tomoyo_pnnn2mac[TOMOYO_MAX_PATH_NUMBER3_OPERATION] = { | |
69 | [TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK, | |
70 | [TOMOYO_TYPE_MKCHAR] = TOMOYO_MAC_FILE_MKCHAR, | |
71 | }; | |
72 | ||
73 | static const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = { | |
74 | [TOMOYO_TYPE_LINK] = TOMOYO_MAC_FILE_LINK, | |
75 | [TOMOYO_TYPE_RENAME] = TOMOYO_MAC_FILE_RENAME, | |
76 | [TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT, | |
77 | }; | |
78 | ||
79 | static const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { | |
80 | [TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE, | |
81 | [TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR, | |
82 | [TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO, | |
83 | [TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK, | |
84 | [TOMOYO_TYPE_IOCTL] = TOMOYO_MAC_FILE_IOCTL, | |
85 | [TOMOYO_TYPE_CHMOD] = TOMOYO_MAC_FILE_CHMOD, | |
86 | [TOMOYO_TYPE_CHOWN] = TOMOYO_MAC_FILE_CHOWN, | |
87 | [TOMOYO_TYPE_CHGRP] = TOMOYO_MAC_FILE_CHGRP, | |
88 | }; | |
89 | ||
7762fbff TH |
90 | void tomoyo_put_name_union(struct tomoyo_name_union *ptr) |
91 | { | |
92 | if (!ptr) | |
93 | return; | |
94 | if (ptr->is_group) | |
95 | tomoyo_put_path_group(ptr->group); | |
96 | else | |
97 | tomoyo_put_name(ptr->filename); | |
98 | } | |
99 | ||
100 | bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, | |
101 | const struct tomoyo_name_union *ptr) | |
102 | { | |
103 | if (ptr->is_group) | |
3f629636 | 104 | return tomoyo_path_matches_group(name, ptr->group); |
7762fbff TH |
105 | return tomoyo_path_matches_pattern(name, ptr->filename); |
106 | } | |
107 | ||
4c3e9e2d TH |
108 | void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
109 | { | |
110 | if (ptr && ptr->is_group) | |
111 | tomoyo_put_number_group(ptr->group); | |
112 | } | |
113 | ||
114 | bool tomoyo_compare_number_union(const unsigned long value, | |
115 | const struct tomoyo_number_union *ptr) | |
116 | { | |
117 | if (ptr->is_group) | |
118 | return tomoyo_number_matches_group(value, value, ptr->group); | |
119 | return value >= ptr->values[0] && value <= ptr->values[1]; | |
120 | } | |
121 | ||
b69a54ee | 122 | /** |
7ef61233 | 123 | * tomoyo_path2keyword - Get the name of single path operation. |
b69a54ee KT |
124 | * |
125 | * @operation: Type of operation. | |
126 | * | |
127 | * Returns the name of single path operation. | |
128 | */ | |
7ef61233 | 129 | const char *tomoyo_path2keyword(const u8 operation) |
b69a54ee | 130 | { |
7ef61233 TH |
131 | return (operation < TOMOYO_MAX_PATH_OPERATION) |
132 | ? tomoyo_path_keyword[operation] : NULL; | |
b69a54ee KT |
133 | } |
134 | ||
a1f9bb6a TH |
135 | /** |
136 | * tomoyo_path_number32keyword - Get the name of path/number/number/number operations. | |
137 | * | |
138 | * @operation: Type of operation. | |
139 | * | |
140 | * Returns the name of path/number/number/number operation. | |
141 | */ | |
142 | const char *tomoyo_path_number32keyword(const u8 operation) | |
143 | { | |
144 | return (operation < TOMOYO_MAX_PATH_NUMBER3_OPERATION) | |
145 | ? tomoyo_path_number3_keyword[operation] : NULL; | |
146 | } | |
147 | ||
b69a54ee | 148 | /** |
7ef61233 | 149 | * tomoyo_path22keyword - Get the name of double path operation. |
b69a54ee KT |
150 | * |
151 | * @operation: Type of operation. | |
152 | * | |
153 | * Returns the name of double path operation. | |
154 | */ | |
7ef61233 | 155 | const char *tomoyo_path22keyword(const u8 operation) |
b69a54ee | 156 | { |
7ef61233 TH |
157 | return (operation < TOMOYO_MAX_PATH2_OPERATION) |
158 | ? tomoyo_path2_keyword[operation] : NULL; | |
b69a54ee KT |
159 | } |
160 | ||
a1f9bb6a TH |
161 | /** |
162 | * tomoyo_path_number2keyword - Get the name of path/number operations. | |
163 | * | |
164 | * @operation: Type of operation. | |
165 | * | |
166 | * Returns the name of path/number operation. | |
167 | */ | |
168 | const char *tomoyo_path_number2keyword(const u8 operation) | |
169 | { | |
170 | return (operation < TOMOYO_MAX_PATH_NUMBER_OPERATION) | |
171 | ? tomoyo_path_number_keyword[operation] : NULL; | |
172 | } | |
173 | ||
c8c57e84 TH |
174 | static void tomoyo_add_slash(struct tomoyo_path_info *buf) |
175 | { | |
176 | if (buf->is_dir) | |
177 | return; | |
178 | /* | |
179 | * This is OK because tomoyo_encode() reserves space for appending "/". | |
180 | */ | |
181 | strcat((char *) buf->name, "/"); | |
182 | tomoyo_fill_path_info(buf); | |
183 | } | |
184 | ||
b69a54ee KT |
185 | /** |
186 | * tomoyo_strendswith - Check whether the token ends with the given token. | |
187 | * | |
188 | * @name: The token to check. | |
189 | * @tail: The token to find. | |
190 | * | |
191 | * Returns true if @name ends with @tail, false otherwise. | |
192 | */ | |
193 | static bool tomoyo_strendswith(const char *name, const char *tail) | |
194 | { | |
195 | int len; | |
196 | ||
197 | if (!name || !tail) | |
198 | return false; | |
199 | len = strlen(name) - strlen(tail); | |
200 | return len >= 0 && !strcmp(name + len, tail); | |
201 | } | |
202 | ||
203 | /** | |
c8c57e84 | 204 | * tomoyo_get_realpath - Get realpath. |
b69a54ee | 205 | * |
c8c57e84 | 206 | * @buf: Pointer to "struct tomoyo_path_info". |
b69a54ee KT |
207 | * @path: Pointer to "struct path". |
208 | * | |
c8c57e84 | 209 | * Returns true on success, false otherwise. |
b69a54ee | 210 | */ |
c8c57e84 | 211 | static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path) |
b69a54ee | 212 | { |
c8c57e84 TH |
213 | buf->name = tomoyo_realpath_from_path(path); |
214 | if (buf->name) { | |
215 | tomoyo_fill_path_info(buf); | |
216 | return true; | |
b69a54ee | 217 | } |
c8c57e84 | 218 | return false; |
b69a54ee KT |
219 | } |
220 | ||
7ef61233 TH |
221 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
222 | const char *filename2, | |
223 | struct tomoyo_domain_info *const domain, | |
224 | const bool is_delete); | |
225 | static int tomoyo_update_path_acl(const u8 type, const char *filename, | |
226 | struct tomoyo_domain_info *const domain, | |
227 | const bool is_delete); | |
b69a54ee | 228 | |
c3fa109a TH |
229 | /* |
230 | * tomoyo_globally_readable_list is used for holding list of pathnames which | |
231 | * are by default allowed to be open()ed for reading by any process. | |
232 | * | |
233 | * An entry is added by | |
234 | * | |
235 | * # echo 'allow_read /lib/libc-2.5.so' > \ | |
236 | * /sys/kernel/security/tomoyo/exception_policy | |
237 | * | |
238 | * and is deleted by | |
239 | * | |
240 | * # echo 'delete allow_read /lib/libc-2.5.so' > \ | |
241 | * /sys/kernel/security/tomoyo/exception_policy | |
242 | * | |
243 | * and all entries are retrieved by | |
244 | * | |
245 | * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy | |
246 | * | |
247 | * In the example above, any process is allowed to | |
248 | * open("/lib/libc-2.5.so", O_RDONLY). | |
249 | * One exception is, if the domain which current process belongs to is marked | |
250 | * as "ignore_global_allow_read", current process can't do so unless explicitly | |
251 | * given "allow_read /lib/libc-2.5.so" to the domain which current process | |
252 | * belongs to. | |
253 | */ | |
847b173e | 254 | LIST_HEAD(tomoyo_globally_readable_list); |
b69a54ee KT |
255 | |
256 | /** | |
257 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
258 | * | |
259 | * @filename: Filename unconditionally permitted to open() for reading. | |
260 | * @is_delete: True if it is a delete request. | |
261 | * | |
262 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
263 | * |
264 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
265 | */ |
266 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
267 | const bool is_delete) | |
268 | { | |
b69a54ee | 269 | struct tomoyo_globally_readable_file_entry *ptr; |
9e4b50e9 | 270 | struct tomoyo_globally_readable_file_entry e = { }; |
ca0b7df3 | 271 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 272 | |
3f629636 | 273 | if (!tomoyo_is_correct_word(filename)) |
b69a54ee | 274 | return -EINVAL; |
9e4b50e9 TH |
275 | e.filename = tomoyo_get_name(filename); |
276 | if (!e.filename) | |
b69a54ee | 277 | return -ENOMEM; |
29282381 TH |
278 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
279 | goto out; | |
fdb8ebb7 | 280 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { |
9e4b50e9 | 281 | if (ptr->filename != e.filename) |
b69a54ee KT |
282 | continue; |
283 | ptr->is_deleted = is_delete; | |
284 | error = 0; | |
ca0b7df3 | 285 | break; |
b69a54ee | 286 | } |
9e4b50e9 TH |
287 | if (!is_delete && error) { |
288 | struct tomoyo_globally_readable_file_entry *entry = | |
289 | tomoyo_commit_ok(&e, sizeof(e)); | |
290 | if (entry) { | |
291 | list_add_tail_rcu(&entry->list, | |
292 | &tomoyo_globally_readable_list); | |
293 | error = 0; | |
294 | } | |
b69a54ee | 295 | } |
f737d95d | 296 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 297 | out: |
9e4b50e9 | 298 | tomoyo_put_name(e.filename); |
b69a54ee KT |
299 | return error; |
300 | } | |
301 | ||
302 | /** | |
303 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
304 | * | |
305 | * @filename: The filename to check. | |
306 | * | |
307 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
308 | * |
309 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
310 | */ |
311 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
312 | filename) | |
313 | { | |
314 | struct tomoyo_globally_readable_file_entry *ptr; | |
315 | bool found = false; | |
fdb8ebb7 TH |
316 | |
317 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { | |
b69a54ee KT |
318 | if (!ptr->is_deleted && |
319 | tomoyo_path_matches_pattern(filename, ptr->filename)) { | |
320 | found = true; | |
321 | break; | |
322 | } | |
323 | } | |
b69a54ee KT |
324 | return found; |
325 | } | |
326 | ||
327 | /** | |
328 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
329 | * | |
330 | * @data: String to parse. | |
331 | * @is_delete: True if it is a delete request. | |
332 | * | |
333 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
334 | * |
335 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
336 | */ |
337 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
338 | { | |
339 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
340 | } | |
341 | ||
342 | /** | |
343 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
344 | * | |
345 | * @head: Pointer to "struct tomoyo_io_buffer". | |
346 | * | |
347 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
348 | * |
349 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
350 | */ |
351 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
352 | { | |
353 | struct list_head *pos; | |
354 | bool done = true; | |
355 | ||
b69a54ee KT |
356 | list_for_each_cookie(pos, head->read_var2, |
357 | &tomoyo_globally_readable_list) { | |
358 | struct tomoyo_globally_readable_file_entry *ptr; | |
359 | ptr = list_entry(pos, | |
360 | struct tomoyo_globally_readable_file_entry, | |
361 | list); | |
362 | if (ptr->is_deleted) | |
363 | continue; | |
7d2948b1 TH |
364 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
365 | ptr->filename->name); | |
366 | if (!done) | |
b69a54ee | 367 | break; |
b69a54ee | 368 | } |
b69a54ee KT |
369 | return done; |
370 | } | |
371 | ||
c3fa109a TH |
372 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
373 | * converting pathnames to pathname patterns during learning mode. | |
374 | * | |
375 | * An entry is added by | |
376 | * | |
377 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
378 | * /sys/kernel/security/tomoyo/exception_policy | |
379 | * | |
380 | * and is deleted by | |
381 | * | |
382 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
383 | * /sys/kernel/security/tomoyo/exception_policy | |
384 | * | |
385 | * and all entries are retrieved by | |
386 | * | |
387 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
388 | * | |
389 | * In the example above, if a process which belongs to a domain which is in | |
390 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
391 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
392 | * process belongs to. | |
393 | * | |
394 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
395 | * /proc/self/ when current process needs to access only current process's | |
396 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
397 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
398 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
399 | * current process from accessing other process's information. | |
400 | */ | |
847b173e | 401 | LIST_HEAD(tomoyo_pattern_list); |
b69a54ee KT |
402 | |
403 | /** | |
404 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
405 | * | |
406 | * @pattern: Pathname pattern. | |
407 | * @is_delete: True if it is a delete request. | |
408 | * | |
409 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
410 | * |
411 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
412 | */ |
413 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
414 | const bool is_delete) | |
415 | { | |
b69a54ee | 416 | struct tomoyo_pattern_entry *ptr; |
3f629636 | 417 | struct tomoyo_pattern_entry e = { }; |
ca0b7df3 | 418 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 419 | |
3f629636 TH |
420 | if (!tomoyo_is_correct_word(pattern)) |
421 | return -EINVAL; | |
422 | e.pattern = tomoyo_get_name(pattern); | |
9e4b50e9 | 423 | if (!e.pattern) |
ca0b7df3 | 424 | return error; |
29282381 TH |
425 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
426 | goto out; | |
fdb8ebb7 | 427 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
9e4b50e9 | 428 | if (e.pattern != ptr->pattern) |
b69a54ee KT |
429 | continue; |
430 | ptr->is_deleted = is_delete; | |
431 | error = 0; | |
ca0b7df3 | 432 | break; |
b69a54ee | 433 | } |
9e4b50e9 TH |
434 | if (!is_delete && error) { |
435 | struct tomoyo_pattern_entry *entry = | |
436 | tomoyo_commit_ok(&e, sizeof(e)); | |
437 | if (entry) { | |
438 | list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); | |
439 | error = 0; | |
440 | } | |
b69a54ee | 441 | } |
f737d95d | 442 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 443 | out: |
9e4b50e9 | 444 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
445 | return error; |
446 | } | |
447 | ||
448 | /** | |
17fcfbd9 | 449 | * tomoyo_file_pattern - Get patterned pathname. |
b69a54ee KT |
450 | * |
451 | * @filename: The filename to find patterned pathname. | |
452 | * | |
453 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
454 | * |
455 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 456 | */ |
17fcfbd9 | 457 | const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename) |
b69a54ee KT |
458 | { |
459 | struct tomoyo_pattern_entry *ptr; | |
460 | const struct tomoyo_path_info *pattern = NULL; | |
461 | ||
fdb8ebb7 | 462 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
b69a54ee KT |
463 | if (ptr->is_deleted) |
464 | continue; | |
465 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
466 | continue; | |
467 | pattern = ptr->pattern; | |
468 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
469 | /* Do nothing. Try to find the better match. */ | |
470 | } else { | |
471 | /* This would be the better match. Use this. */ | |
472 | break; | |
473 | } | |
474 | } | |
b69a54ee KT |
475 | if (pattern) |
476 | filename = pattern; | |
17fcfbd9 | 477 | return filename->name; |
b69a54ee KT |
478 | } |
479 | ||
480 | /** | |
481 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
482 | * | |
483 | * @data: String to parse. | |
484 | * @is_delete: True if it is a delete request. | |
485 | * | |
486 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
487 | * |
488 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
489 | */ |
490 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
491 | { | |
492 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
493 | } | |
494 | ||
495 | /** | |
496 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
497 | * | |
498 | * @head: Pointer to "struct tomoyo_io_buffer". | |
499 | * | |
500 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
501 | * |
502 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
503 | */ |
504 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
505 | { | |
506 | struct list_head *pos; | |
507 | bool done = true; | |
508 | ||
b69a54ee KT |
509 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
510 | struct tomoyo_pattern_entry *ptr; | |
511 | ptr = list_entry(pos, struct tomoyo_pattern_entry, list); | |
512 | if (ptr->is_deleted) | |
513 | continue; | |
7d2948b1 TH |
514 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
515 | "%s\n", ptr->pattern->name); | |
516 | if (!done) | |
b69a54ee | 517 | break; |
b69a54ee | 518 | } |
b69a54ee KT |
519 | return done; |
520 | } | |
521 | ||
c3fa109a TH |
522 | /* |
523 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
524 | * default forbidden to modify already written content of a file. | |
525 | * | |
526 | * An entry is added by | |
527 | * | |
528 | * # echo 'deny_rewrite /var/log/messages' > \ | |
529 | * /sys/kernel/security/tomoyo/exception_policy | |
530 | * | |
531 | * and is deleted by | |
532 | * | |
533 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
534 | * /sys/kernel/security/tomoyo/exception_policy | |
535 | * | |
536 | * and all entries are retrieved by | |
537 | * | |
538 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
539 | * | |
540 | * In the example above, if a process requested to rewrite /var/log/messages , | |
541 | * the process can't rewrite unless the domain which that process belongs to | |
542 | * has "allow_rewrite /var/log/messages" entry. | |
543 | * | |
544 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
545 | * when we want to allow rewriting already unlink()ed file. As of now, | |
546 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
547 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
548 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
549 | * need to worry whether the file is already unlink()ed or not. | |
550 | */ | |
847b173e | 551 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee KT |
552 | |
553 | /** | |
554 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
555 | * | |
556 | * @pattern: Pathname pattern that are not rewritable by default. | |
557 | * @is_delete: True if it is a delete request. | |
558 | * | |
559 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
560 | * |
561 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
562 | */ |
563 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
564 | const bool is_delete) | |
565 | { | |
ca0b7df3 | 566 | struct tomoyo_no_rewrite_entry *ptr; |
9e4b50e9 | 567 | struct tomoyo_no_rewrite_entry e = { }; |
ca0b7df3 | 568 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 569 | |
3f629636 | 570 | if (!tomoyo_is_correct_word(pattern)) |
b69a54ee | 571 | return -EINVAL; |
9e4b50e9 TH |
572 | e.pattern = tomoyo_get_name(pattern); |
573 | if (!e.pattern) | |
ca0b7df3 | 574 | return error; |
29282381 TH |
575 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
576 | goto out; | |
fdb8ebb7 | 577 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
9e4b50e9 | 578 | if (ptr->pattern != e.pattern) |
b69a54ee KT |
579 | continue; |
580 | ptr->is_deleted = is_delete; | |
581 | error = 0; | |
ca0b7df3 | 582 | break; |
b69a54ee | 583 | } |
9e4b50e9 TH |
584 | if (!is_delete && error) { |
585 | struct tomoyo_no_rewrite_entry *entry = | |
586 | tomoyo_commit_ok(&e, sizeof(e)); | |
587 | if (entry) { | |
588 | list_add_tail_rcu(&entry->list, | |
589 | &tomoyo_no_rewrite_list); | |
590 | error = 0; | |
591 | } | |
b69a54ee | 592 | } |
f737d95d | 593 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 594 | out: |
9e4b50e9 | 595 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
596 | return error; |
597 | } | |
598 | ||
599 | /** | |
600 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
601 | * | |
602 | * @filename: Filename to check. | |
603 | * | |
604 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
605 | * false otherwise. | |
fdb8ebb7 TH |
606 | * |
607 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
608 | */ |
609 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
610 | { | |
611 | struct tomoyo_no_rewrite_entry *ptr; | |
612 | bool found = false; | |
613 | ||
fdb8ebb7 | 614 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
b69a54ee KT |
615 | if (ptr->is_deleted) |
616 | continue; | |
617 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
618 | continue; | |
619 | found = true; | |
620 | break; | |
621 | } | |
b69a54ee KT |
622 | return found; |
623 | } | |
624 | ||
625 | /** | |
626 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
627 | * | |
628 | * @data: String to parse. | |
629 | * @is_delete: True if it is a delete request. | |
630 | * | |
631 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
632 | * |
633 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
634 | */ |
635 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
636 | { | |
637 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
638 | } | |
639 | ||
640 | /** | |
641 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
642 | * | |
643 | * @head: Pointer to "struct tomoyo_io_buffer". | |
644 | * | |
645 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
646 | * |
647 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
648 | */ |
649 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
650 | { | |
651 | struct list_head *pos; | |
652 | bool done = true; | |
653 | ||
b69a54ee KT |
654 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
655 | struct tomoyo_no_rewrite_entry *ptr; | |
656 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); | |
657 | if (ptr->is_deleted) | |
658 | continue; | |
7d2948b1 TH |
659 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
660 | "%s\n", ptr->pattern->name); | |
661 | if (!done) | |
b69a54ee | 662 | break; |
b69a54ee | 663 | } |
b69a54ee KT |
664 | return done; |
665 | } | |
666 | ||
667 | /** | |
668 | * tomoyo_update_file_acl - Update file's read/write/execute ACL. | |
669 | * | |
b69a54ee | 670 | * @perm: Permission (between 1 to 7). |
a1f9bb6a | 671 | * @filename: Filename. |
b69a54ee KT |
672 | * @domain: Pointer to "struct tomoyo_domain_info". |
673 | * @is_delete: True if it is a delete request. | |
674 | * | |
675 | * Returns 0 on success, negative value otherwise. | |
676 | * | |
677 | * This is legacy support interface for older policy syntax. | |
678 | * Current policy syntax uses "allow_read/write" instead of "6", | |
679 | * "allow_read" instead of "4", "allow_write" instead of "2", | |
680 | * "allow_execute" instead of "1". | |
fdb8ebb7 TH |
681 | * |
682 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 683 | */ |
a1f9bb6a | 684 | static int tomoyo_update_file_acl(u8 perm, const char *filename, |
b69a54ee KT |
685 | struct tomoyo_domain_info * const domain, |
686 | const bool is_delete) | |
687 | { | |
688 | if (perm > 7 || !perm) { | |
689 | printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", | |
690 | __func__, perm, filename); | |
691 | return -EINVAL; | |
692 | } | |
693 | if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) | |
694 | /* | |
695 | * Only 'allow_mkdir' and 'allow_rmdir' are valid for | |
696 | * directory permissions. | |
697 | */ | |
698 | return 0; | |
699 | if (perm & 4) | |
7ef61233 TH |
700 | tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain, |
701 | is_delete); | |
b69a54ee | 702 | if (perm & 2) |
7ef61233 TH |
703 | tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain, |
704 | is_delete); | |
b69a54ee | 705 | if (perm & 1) |
7ef61233 TH |
706 | tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain, |
707 | is_delete); | |
b69a54ee KT |
708 | return 0; |
709 | } | |
710 | ||
711 | /** | |
cb0abe6a | 712 | * tomoyo_path_acl - Check permission for single path operation. |
b69a54ee | 713 | * |
cb0abe6a | 714 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
715 | * @filename: Filename to check. |
716 | * @perm: Permission. | |
b69a54ee KT |
717 | * |
718 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
719 | * |
720 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 721 | */ |
cb0abe6a TH |
722 | static int tomoyo_path_acl(const struct tomoyo_request_info *r, |
723 | const struct tomoyo_path_info *filename, | |
3f629636 | 724 | const u32 perm) |
b69a54ee | 725 | { |
cb0abe6a | 726 | struct tomoyo_domain_info *domain = r->domain; |
b69a54ee KT |
727 | struct tomoyo_acl_info *ptr; |
728 | int error = -EPERM; | |
729 | ||
fdb8ebb7 | 730 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
731 | struct tomoyo_path_acl *acl; |
732 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 733 | continue; |
7ef61233 | 734 | acl = container_of(ptr, struct tomoyo_path_acl, head); |
a1f9bb6a | 735 | if (!(acl->perm & perm) || |
3f629636 | 736 | !tomoyo_compare_name_union(filename, &acl->name)) |
b69a54ee | 737 | continue; |
b69a54ee KT |
738 | error = 0; |
739 | break; | |
740 | } | |
b69a54ee KT |
741 | return error; |
742 | } | |
743 | ||
744 | /** | |
cb0abe6a | 745 | * tomoyo_file_perm - Check permission for opening files. |
b69a54ee | 746 | * |
cb0abe6a | 747 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee | 748 | * @filename: Filename to check. |
cb0abe6a | 749 | * @mode: Mode ("read" or "write" or "read/write" or "execute"). |
b69a54ee KT |
750 | * |
751 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
752 | * |
753 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 754 | */ |
cb0abe6a TH |
755 | static int tomoyo_file_perm(struct tomoyo_request_info *r, |
756 | const struct tomoyo_path_info *filename, | |
757 | const u8 mode) | |
b69a54ee | 758 | { |
b69a54ee KT |
759 | const char *msg = "<unknown>"; |
760 | int error = 0; | |
cb0abe6a | 761 | u32 perm = 0; |
b69a54ee KT |
762 | |
763 | if (!filename) | |
764 | return 0; | |
cb0abe6a TH |
765 | |
766 | if (mode == 6) { | |
7ef61233 | 767 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); |
cb0abe6a TH |
768 | perm = 1 << TOMOYO_TYPE_READ_WRITE; |
769 | } else if (mode == 4) { | |
7ef61233 | 770 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); |
cb0abe6a TH |
771 | perm = 1 << TOMOYO_TYPE_READ; |
772 | } else if (mode == 2) { | |
7ef61233 | 773 | msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); |
cb0abe6a TH |
774 | perm = 1 << TOMOYO_TYPE_WRITE; |
775 | } else if (mode == 1) { | |
7ef61233 | 776 | msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); |
cb0abe6a TH |
777 | perm = 1 << TOMOYO_TYPE_EXECUTE; |
778 | } else | |
b69a54ee | 779 | BUG(); |
17fcfbd9 | 780 | do { |
3f629636 | 781 | error = tomoyo_path_acl(r, filename, perm); |
17fcfbd9 TH |
782 | if (error && mode == 4 && !r->domain->ignore_global_allow_read |
783 | && tomoyo_is_globally_readable_file(filename)) | |
784 | error = 0; | |
785 | if (!error) | |
786 | break; | |
787 | tomoyo_warn_log(r, "%s %s", msg, filename->name); | |
788 | error = tomoyo_supervisor(r, "allow_%s %s\n", msg, | |
17fcfbd9 TH |
789 | tomoyo_file_pattern(filename)); |
790 | /* | |
791 | * Do not retry for execute request, for alias may have | |
792 | * changed. | |
793 | */ | |
794 | } while (error == TOMOYO_RETRY_REQUEST && mode != 1); | |
795 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
cb0abe6a | 796 | error = 0; |
17fcfbd9 | 797 | return error; |
b69a54ee KT |
798 | } |
799 | ||
b69a54ee | 800 | /** |
7ef61233 | 801 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
802 | * |
803 | * @type: Type of operation. | |
804 | * @filename: Filename. | |
805 | * @domain: Pointer to "struct tomoyo_domain_info". | |
806 | * @is_delete: True if it is a delete request. | |
807 | * | |
808 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
809 | * |
810 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 811 | */ |
7ef61233 TH |
812 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
813 | struct tomoyo_domain_info *const domain, | |
814 | const bool is_delete) | |
b69a54ee | 815 | { |
a1f9bb6a | 816 | static const u16 tomoyo_rw_mask = |
7ef61233 | 817 | (1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE); |
a1f9bb6a | 818 | const u16 perm = 1 << type; |
b69a54ee | 819 | struct tomoyo_acl_info *ptr; |
9e4b50e9 TH |
820 | struct tomoyo_path_acl e = { |
821 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
9e4b50e9 TH |
822 | .perm = perm |
823 | }; | |
ca0b7df3 | 824 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 825 | |
9e4b50e9 TH |
826 | if (type == TOMOYO_TYPE_READ_WRITE) |
827 | e.perm |= tomoyo_rw_mask; | |
b69a54ee KT |
828 | if (!domain) |
829 | return -EINVAL; | |
7762fbff | 830 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 831 | return -EINVAL; |
29282381 TH |
832 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
833 | goto out; | |
fdb8ebb7 | 834 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
835 | struct tomoyo_path_acl *acl = |
836 | container_of(ptr, struct tomoyo_path_acl, head); | |
7762fbff | 837 | if (!tomoyo_is_same_path_acl(acl, &e)) |
b69a54ee | 838 | continue; |
ca0b7df3 | 839 | if (is_delete) { |
a1f9bb6a | 840 | acl->perm &= ~perm; |
9e4b50e9 | 841 | if ((acl->perm & tomoyo_rw_mask) != tomoyo_rw_mask) |
7ef61233 TH |
842 | acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); |
843 | else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
9e4b50e9 | 844 | acl->perm &= ~tomoyo_rw_mask; |
ca0b7df3 | 845 | } else { |
a1f9bb6a | 846 | acl->perm |= perm; |
9e4b50e9 | 847 | if ((acl->perm & tomoyo_rw_mask) == tomoyo_rw_mask) |
7ef61233 TH |
848 | acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE; |
849 | else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
9e4b50e9 | 850 | acl->perm |= tomoyo_rw_mask; |
ca0b7df3 | 851 | } |
b69a54ee | 852 | error = 0; |
ca0b7df3 | 853 | break; |
cd7bec6a | 854 | } |
9e4b50e9 TH |
855 | if (!is_delete && error) { |
856 | struct tomoyo_path_acl *entry = | |
857 | tomoyo_commit_ok(&e, sizeof(e)); | |
858 | if (entry) { | |
859 | list_add_tail_rcu(&entry->head.list, | |
860 | &domain->acl_info_list); | |
861 | error = 0; | |
862 | } | |
b69a54ee | 863 | } |
f737d95d | 864 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 865 | out: |
7762fbff | 866 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
867 | return error; |
868 | } | |
869 | ||
a1f9bb6a TH |
870 | /** |
871 | * tomoyo_update_path_number3_acl - Update "struct tomoyo_path_number3_acl" list. | |
872 | * | |
873 | * @type: Type of operation. | |
874 | * @filename: Filename. | |
875 | * @mode: Create mode. | |
876 | * @major: Device major number. | |
877 | * @minor: Device minor number. | |
878 | * @domain: Pointer to "struct tomoyo_domain_info". | |
879 | * @is_delete: True if it is a delete request. | |
880 | * | |
881 | * Returns 0 on success, negative value otherwise. | |
882 | */ | |
883 | static inline int tomoyo_update_path_number3_acl(const u8 type, | |
884 | const char *filename, | |
885 | char *mode, | |
886 | char *major, char *minor, | |
887 | struct tomoyo_domain_info * | |
888 | const domain, | |
889 | const bool is_delete) | |
890 | { | |
891 | const u8 perm = 1 << type; | |
892 | struct tomoyo_acl_info *ptr; | |
893 | struct tomoyo_path_number3_acl e = { | |
894 | .head.type = TOMOYO_TYPE_PATH_NUMBER3_ACL, | |
895 | .perm = perm | |
896 | }; | |
897 | int error = is_delete ? -ENOENT : -ENOMEM; | |
898 | if (!tomoyo_parse_name_union(filename, &e.name) || | |
899 | !tomoyo_parse_number_union(mode, &e.mode) || | |
900 | !tomoyo_parse_number_union(major, &e.major) || | |
901 | !tomoyo_parse_number_union(minor, &e.minor)) | |
902 | goto out; | |
903 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
904 | goto out; | |
905 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
906 | struct tomoyo_path_number3_acl *acl = | |
907 | container_of(ptr, struct tomoyo_path_number3_acl, head); | |
908 | if (!tomoyo_is_same_path_number3_acl(acl, &e)) | |
909 | continue; | |
910 | if (is_delete) | |
911 | acl->perm &= ~perm; | |
912 | else | |
913 | acl->perm |= perm; | |
914 | error = 0; | |
915 | break; | |
916 | } | |
917 | if (!is_delete && error) { | |
918 | struct tomoyo_path_number3_acl *entry = | |
919 | tomoyo_commit_ok(&e, sizeof(e)); | |
920 | if (entry) { | |
921 | list_add_tail_rcu(&entry->head.list, | |
922 | &domain->acl_info_list); | |
923 | error = 0; | |
924 | } | |
925 | } | |
926 | mutex_unlock(&tomoyo_policy_lock); | |
927 | out: | |
928 | tomoyo_put_name_union(&e.name); | |
929 | tomoyo_put_number_union(&e.mode); | |
930 | tomoyo_put_number_union(&e.major); | |
931 | tomoyo_put_number_union(&e.minor); | |
932 | return error; | |
933 | } | |
934 | ||
b69a54ee | 935 | /** |
7ef61233 | 936 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
937 | * |
938 | * @type: Type of operation. | |
939 | * @filename1: First filename. | |
940 | * @filename2: Second filename. | |
941 | * @domain: Pointer to "struct tomoyo_domain_info". | |
942 | * @is_delete: True if it is a delete request. | |
943 | * | |
944 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
945 | * |
946 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 947 | */ |
7ef61233 TH |
948 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
949 | const char *filename2, | |
950 | struct tomoyo_domain_info *const domain, | |
951 | const bool is_delete) | |
b69a54ee | 952 | { |
9e4b50e9 TH |
953 | const u8 perm = 1 << type; |
954 | struct tomoyo_path2_acl e = { | |
955 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
956 | .perm = perm | |
957 | }; | |
b69a54ee | 958 | struct tomoyo_acl_info *ptr; |
ca0b7df3 | 959 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee KT |
960 | |
961 | if (!domain) | |
962 | return -EINVAL; | |
7762fbff TH |
963 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
964 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 965 | goto out; |
29282381 TH |
966 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
967 | goto out; | |
fdb8ebb7 | 968 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
969 | struct tomoyo_path2_acl *acl = |
970 | container_of(ptr, struct tomoyo_path2_acl, head); | |
7762fbff | 971 | if (!tomoyo_is_same_path2_acl(acl, &e)) |
b69a54ee | 972 | continue; |
ca0b7df3 TH |
973 | if (is_delete) |
974 | acl->perm &= ~perm; | |
975 | else | |
976 | acl->perm |= perm; | |
b69a54ee | 977 | error = 0; |
ca0b7df3 | 978 | break; |
cd7bec6a | 979 | } |
9e4b50e9 TH |
980 | if (!is_delete && error) { |
981 | struct tomoyo_path2_acl *entry = | |
982 | tomoyo_commit_ok(&e, sizeof(e)); | |
983 | if (entry) { | |
984 | list_add_tail_rcu(&entry->head.list, | |
985 | &domain->acl_info_list); | |
986 | error = 0; | |
987 | } | |
b69a54ee | 988 | } |
f737d95d | 989 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 990 | out: |
7762fbff TH |
991 | tomoyo_put_name_union(&e.name1); |
992 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
993 | return error; |
994 | } | |
995 | ||
a1f9bb6a TH |
996 | /** |
997 | * tomoyo_path_number3_acl - Check permission for path/number/number/number operation. | |
998 | * | |
999 | * @r: Pointer to "struct tomoyo_request_info". | |
1000 | * @filename: Filename to check. | |
1001 | * @perm: Permission. | |
1002 | * @mode: Create mode. | |
1003 | * @major: Device major number. | |
1004 | * @minor: Device minor number. | |
1005 | * | |
1006 | * Returns 0 on success, -EPERM otherwise. | |
1007 | * | |
1008 | * Caller holds tomoyo_read_lock(). | |
1009 | */ | |
1010 | static int tomoyo_path_number3_acl(struct tomoyo_request_info *r, | |
1011 | const struct tomoyo_path_info *filename, | |
1012 | const u16 perm, const unsigned int mode, | |
1013 | const unsigned int major, | |
1014 | const unsigned int minor) | |
1015 | { | |
1016 | struct tomoyo_domain_info *domain = r->domain; | |
1017 | struct tomoyo_acl_info *ptr; | |
1018 | int error = -EPERM; | |
1019 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
1020 | struct tomoyo_path_number3_acl *acl; | |
1021 | if (ptr->type != TOMOYO_TYPE_PATH_NUMBER3_ACL) | |
1022 | continue; | |
1023 | acl = container_of(ptr, struct tomoyo_path_number3_acl, head); | |
1024 | if (!tomoyo_compare_number_union(mode, &acl->mode)) | |
1025 | continue; | |
1026 | if (!tomoyo_compare_number_union(major, &acl->major)) | |
1027 | continue; | |
1028 | if (!tomoyo_compare_number_union(minor, &acl->minor)) | |
1029 | continue; | |
1030 | if (!(acl->perm & perm)) | |
1031 | continue; | |
1032 | if (!tomoyo_compare_name_union(filename, &acl->name)) | |
1033 | continue; | |
1034 | error = 0; | |
1035 | break; | |
1036 | } | |
1037 | return error; | |
1038 | } | |
1039 | ||
b69a54ee | 1040 | /** |
7ef61233 | 1041 | * tomoyo_path2_acl - Check permission for double path operation. |
b69a54ee | 1042 | * |
cb0abe6a | 1043 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
1044 | * @type: Type of operation. |
1045 | * @filename1: First filename to check. | |
1046 | * @filename2: Second filename to check. | |
1047 | * | |
1048 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
1049 | * |
1050 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1051 | */ |
cb0abe6a | 1052 | static int tomoyo_path2_acl(const struct tomoyo_request_info *r, const u8 type, |
7ef61233 TH |
1053 | const struct tomoyo_path_info *filename1, |
1054 | const struct tomoyo_path_info *filename2) | |
b69a54ee | 1055 | { |
cb0abe6a | 1056 | const struct tomoyo_domain_info *domain = r->domain; |
b69a54ee KT |
1057 | struct tomoyo_acl_info *ptr; |
1058 | const u8 perm = 1 << type; | |
1059 | int error = -EPERM; | |
1060 | ||
fdb8ebb7 | 1061 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
1062 | struct tomoyo_path2_acl *acl; |
1063 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 1064 | continue; |
7ef61233 | 1065 | acl = container_of(ptr, struct tomoyo_path2_acl, head); |
b69a54ee KT |
1066 | if (!(acl->perm & perm)) |
1067 | continue; | |
7762fbff | 1068 | if (!tomoyo_compare_name_union(filename1, &acl->name1)) |
b69a54ee | 1069 | continue; |
7762fbff | 1070 | if (!tomoyo_compare_name_union(filename2, &acl->name2)) |
b69a54ee KT |
1071 | continue; |
1072 | error = 0; | |
1073 | break; | |
1074 | } | |
b69a54ee KT |
1075 | return error; |
1076 | } | |
1077 | ||
1078 | /** | |
cb0abe6a | 1079 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 1080 | * |
cb0abe6a | 1081 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
1082 | * @operation: Type of operation. |
1083 | * @filename: Filename to check. | |
b69a54ee KT |
1084 | * |
1085 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1086 | * |
1087 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1088 | */ |
cb0abe6a TH |
1089 | static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
1090 | const struct tomoyo_path_info *filename) | |
b69a54ee | 1091 | { |
17fcfbd9 | 1092 | const char *msg; |
b69a54ee | 1093 | int error; |
b69a54ee | 1094 | |
b69a54ee | 1095 | next: |
57c2590f TH |
1096 | r->type = tomoyo_p2mac[operation]; |
1097 | r->mode = tomoyo_get_mode(r->profile, r->type); | |
1098 | if (r->mode == TOMOYO_CONFIG_DISABLED) | |
1099 | return 0; | |
17fcfbd9 | 1100 | do { |
3f629636 | 1101 | error = tomoyo_path_acl(r, filename, 1 << operation); |
17fcfbd9 TH |
1102 | if (!error) |
1103 | break; | |
1104 | msg = tomoyo_path2keyword(operation); | |
1105 | tomoyo_warn_log(r, "%s %s", msg, filename->name); | |
1106 | error = tomoyo_supervisor(r, "allow_%s %s\n", msg, | |
1107 | tomoyo_file_pattern(filename)); | |
1108 | } while (error == TOMOYO_RETRY_REQUEST); | |
cb0abe6a | 1109 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee | 1110 | error = 0; |
b69a54ee KT |
1111 | /* |
1112 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1113 | * we need to check "allow_rewrite" permission if the filename is | |
1114 | * specified by "deny_rewrite" keyword. | |
1115 | */ | |
7ef61233 | 1116 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
b69a54ee | 1117 | tomoyo_is_no_rewrite_file(filename)) { |
7ef61233 | 1118 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
1119 | goto next; |
1120 | } | |
1121 | return error; | |
1122 | } | |
1123 | ||
a1f9bb6a TH |
1124 | /** |
1125 | * tomoyo_path_number_acl - Check permission for ioctl/chmod/chown/chgrp operation. | |
1126 | * | |
1127 | * @r: Pointer to "struct tomoyo_request_info". | |
1128 | * @type: Operation. | |
1129 | * @filename: Filename to check. | |
1130 | * @number: Number. | |
1131 | * | |
1132 | * Returns 0 on success, -EPERM otherwise. | |
1133 | * | |
1134 | * Caller holds tomoyo_read_lock(). | |
1135 | */ | |
1136 | static int tomoyo_path_number_acl(struct tomoyo_request_info *r, const u8 type, | |
1137 | const struct tomoyo_path_info *filename, | |
1138 | const unsigned long number) | |
1139 | { | |
1140 | struct tomoyo_domain_info *domain = r->domain; | |
1141 | struct tomoyo_acl_info *ptr; | |
1142 | const u8 perm = 1 << type; | |
1143 | int error = -EPERM; | |
1144 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
1145 | struct tomoyo_path_number_acl *acl; | |
1146 | if (ptr->type != TOMOYO_TYPE_PATH_NUMBER_ACL) | |
1147 | continue; | |
1148 | acl = container_of(ptr, struct tomoyo_path_number_acl, | |
1149 | head); | |
1150 | if (!(acl->perm & perm) || | |
1151 | !tomoyo_compare_number_union(number, &acl->number) || | |
1152 | !tomoyo_compare_name_union(filename, &acl->name)) | |
1153 | continue; | |
1154 | error = 0; | |
1155 | break; | |
1156 | } | |
1157 | return error; | |
1158 | } | |
1159 | ||
1160 | /** | |
1161 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. | |
1162 | * | |
1163 | * @type: Type of operation. | |
1164 | * @filename: Filename. | |
1165 | * @number: Number. | |
1166 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1167 | * @is_delete: True if it is a delete request. | |
1168 | * | |
1169 | * Returns 0 on success, negative value otherwise. | |
1170 | */ | |
1171 | static inline int tomoyo_update_path_number_acl(const u8 type, | |
1172 | const char *filename, | |
1173 | char *number, | |
1174 | struct tomoyo_domain_info * | |
1175 | const domain, | |
1176 | const bool is_delete) | |
1177 | { | |
1178 | const u8 perm = 1 << type; | |
1179 | struct tomoyo_acl_info *ptr; | |
1180 | struct tomoyo_path_number_acl e = { | |
1181 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
1182 | .perm = perm | |
1183 | }; | |
1184 | int error = is_delete ? -ENOENT : -ENOMEM; | |
1185 | if (!domain) | |
1186 | return -EINVAL; | |
1187 | if (!tomoyo_parse_name_union(filename, &e.name)) | |
1188 | return -EINVAL; | |
1189 | if (!tomoyo_parse_number_union(number, &e.number)) | |
1190 | goto out; | |
1191 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
1192 | goto out; | |
1193 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
1194 | struct tomoyo_path_number_acl *acl = | |
1195 | container_of(ptr, struct tomoyo_path_number_acl, head); | |
1196 | if (!tomoyo_is_same_path_number_acl(acl, &e)) | |
1197 | continue; | |
1198 | if (is_delete) | |
1199 | acl->perm &= ~perm; | |
1200 | else | |
1201 | acl->perm |= perm; | |
1202 | error = 0; | |
1203 | break; | |
1204 | } | |
1205 | if (!is_delete && error) { | |
1206 | struct tomoyo_path_number_acl *entry = | |
1207 | tomoyo_commit_ok(&e, sizeof(e)); | |
1208 | if (entry) { | |
1209 | list_add_tail_rcu(&entry->head.list, | |
1210 | &domain->acl_info_list); | |
1211 | error = 0; | |
1212 | } | |
1213 | } | |
1214 | mutex_unlock(&tomoyo_policy_lock); | |
1215 | out: | |
1216 | tomoyo_put_name_union(&e.name); | |
1217 | tomoyo_put_number_union(&e.number); | |
1218 | return error; | |
1219 | } | |
1220 | ||
1221 | /** | |
1222 | * tomoyo_path_number_perm2 - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1223 | * | |
1224 | * @r: Pointer to "strct tomoyo_request_info". | |
1225 | * @filename: Filename to check. | |
1226 | * @number: Number. | |
1227 | * | |
1228 | * Returns 0 on success, negative value otherwise. | |
1229 | * | |
1230 | * Caller holds tomoyo_read_lock(). | |
1231 | */ | |
1232 | static int tomoyo_path_number_perm2(struct tomoyo_request_info *r, | |
1233 | const u8 type, | |
1234 | const struct tomoyo_path_info *filename, | |
1235 | const unsigned long number) | |
1236 | { | |
1237 | char buffer[64]; | |
1238 | int error; | |
1239 | u8 radix; | |
17fcfbd9 | 1240 | const char *msg; |
a1f9bb6a TH |
1241 | |
1242 | if (!filename) | |
1243 | return 0; | |
1244 | switch (type) { | |
1245 | case TOMOYO_TYPE_CREATE: | |
1246 | case TOMOYO_TYPE_MKDIR: | |
1247 | case TOMOYO_TYPE_MKFIFO: | |
1248 | case TOMOYO_TYPE_MKSOCK: | |
1249 | case TOMOYO_TYPE_CHMOD: | |
1250 | radix = TOMOYO_VALUE_TYPE_OCTAL; | |
1251 | break; | |
1252 | case TOMOYO_TYPE_IOCTL: | |
1253 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
1254 | break; | |
1255 | default: | |
1256 | radix = TOMOYO_VALUE_TYPE_DECIMAL; | |
1257 | break; | |
1258 | } | |
1259 | tomoyo_print_ulong(buffer, sizeof(buffer), number, radix); | |
17fcfbd9 TH |
1260 | do { |
1261 | error = tomoyo_path_number_acl(r, type, filename, number); | |
1262 | if (!error) | |
1263 | break; | |
1264 | msg = tomoyo_path_number2keyword(type); | |
1265 | tomoyo_warn_log(r, "%s %s %s", msg, filename->name, buffer); | |
1266 | error = tomoyo_supervisor(r, "allow_%s %s %s\n", msg, | |
1267 | tomoyo_file_pattern(filename), | |
1268 | buffer); | |
1269 | } while (error == TOMOYO_RETRY_REQUEST); | |
a1f9bb6a TH |
1270 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
1271 | error = 0; | |
1272 | return error; | |
1273 | } | |
1274 | ||
1275 | /** | |
1276 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1277 | * | |
1278 | * @type: Type of operation. | |
1279 | * @path: Pointer to "struct path". | |
1280 | * @number: Number. | |
1281 | * | |
1282 | * Returns 0 on success, negative value otherwise. | |
1283 | */ | |
1284 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
1285 | unsigned long number) | |
1286 | { | |
1287 | struct tomoyo_request_info r; | |
1288 | int error = -ENOMEM; | |
c8c57e84 | 1289 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1290 | int idx; |
1291 | ||
57c2590f TH |
1292 | if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
1293 | == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) | |
a1f9bb6a TH |
1294 | return 0; |
1295 | idx = tomoyo_read_lock(); | |
c8c57e84 | 1296 | if (!tomoyo_get_realpath(&buf, path)) |
a1f9bb6a | 1297 | goto out; |
c8c57e84 TH |
1298 | if (type == TOMOYO_TYPE_MKDIR) |
1299 | tomoyo_add_slash(&buf); | |
1300 | error = tomoyo_path_number_perm2(&r, type, &buf, number); | |
a1f9bb6a | 1301 | out: |
c8c57e84 | 1302 | kfree(buf.name); |
a1f9bb6a TH |
1303 | tomoyo_read_unlock(idx); |
1304 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1305 | error = 0; | |
1306 | return error; | |
1307 | } | |
1308 | ||
b69a54ee KT |
1309 | /** |
1310 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1311 | * | |
57c2590f | 1312 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee | 1313 | * @filename: Check permission for "execute". |
b69a54ee KT |
1314 | * |
1315 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1316 | * |
1317 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1318 | */ |
57c2590f | 1319 | int tomoyo_check_exec_perm(struct tomoyo_request_info *r, |
bcb86975 | 1320 | const struct tomoyo_path_info *filename) |
b69a54ee | 1321 | { |
57c2590f | 1322 | if (r->mode == TOMOYO_CONFIG_DISABLED) |
b69a54ee | 1323 | return 0; |
57c2590f | 1324 | return tomoyo_file_perm(r, filename, 1); |
b69a54ee KT |
1325 | } |
1326 | ||
1327 | /** | |
1328 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1329 | * | |
1330 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1331 | * @path: Pointer to "struct path". | |
1332 | * @flag: Flags for open(). | |
1333 | * | |
1334 | * Returns 0 on success, negative value otherwise. | |
1335 | */ | |
1336 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1337 | struct path *path, const int flag) | |
1338 | { | |
1339 | const u8 acc_mode = ACC_MODE(flag); | |
1340 | int error = -ENOMEM; | |
c8c57e84 | 1341 | struct tomoyo_path_info buf; |
cb0abe6a | 1342 | struct tomoyo_request_info r; |
fdb8ebb7 | 1343 | int idx; |
b69a54ee | 1344 | |
57c2590f TH |
1345 | if (!path->mnt || |
1346 | (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))) | |
b69a54ee | 1347 | return 0; |
57c2590f TH |
1348 | buf.name = NULL; |
1349 | r.mode = TOMOYO_CONFIG_DISABLED; | |
fdb8ebb7 | 1350 | idx = tomoyo_read_lock(); |
c8c57e84 | 1351 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1352 | goto out; |
1353 | error = 0; | |
1354 | /* | |
1355 | * If the filename is specified by "deny_rewrite" keyword, | |
1356 | * we need to check "allow_rewrite" permission when the filename is not | |
1357 | * opened for append mode or the filename is truncated at open time. | |
1358 | */ | |
57c2590f TH |
1359 | if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND) |
1360 | && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE) | |
1361 | != TOMOYO_CONFIG_DISABLED) { | |
1362 | if (!tomoyo_get_realpath(&buf, path)) { | |
1363 | error = -ENOMEM; | |
1364 | goto out; | |
1365 | } | |
1366 | if (tomoyo_is_no_rewrite_file(&buf)) | |
1367 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, | |
1368 | &buf); | |
b69a54ee | 1369 | } |
57c2590f TH |
1370 | if (!error && acc_mode && |
1371 | tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) | |
1372 | != TOMOYO_CONFIG_DISABLED) { | |
1373 | if (!buf.name && !tomoyo_get_realpath(&buf, path)) { | |
1374 | error = -ENOMEM; | |
1375 | goto out; | |
1376 | } | |
c8c57e84 | 1377 | error = tomoyo_file_perm(&r, &buf, acc_mode); |
57c2590f | 1378 | } |
b69a54ee | 1379 | out: |
c8c57e84 | 1380 | kfree(buf.name); |
fdb8ebb7 | 1381 | tomoyo_read_unlock(idx); |
cb0abe6a | 1382 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1383 | error = 0; |
1384 | return error; | |
1385 | } | |
1386 | ||
1387 | /** | |
2106ccd9 | 1388 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
b69a54ee | 1389 | * |
b69a54ee KT |
1390 | * @operation: Type of operation. |
1391 | * @path: Pointer to "struct path". | |
1392 | * | |
1393 | * Returns 0 on success, negative value otherwise. | |
1394 | */ | |
97d6931e | 1395 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1396 | { |
1397 | int error = -ENOMEM; | |
c8c57e84 | 1398 | struct tomoyo_path_info buf; |
cb0abe6a | 1399 | struct tomoyo_request_info r; |
fdb8ebb7 | 1400 | int idx; |
b69a54ee | 1401 | |
57c2590f TH |
1402 | if (!path->mnt) |
1403 | return 0; | |
1404 | if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) | |
1405 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1406 | return 0; |
57c2590f | 1407 | buf.name = NULL; |
fdb8ebb7 | 1408 | idx = tomoyo_read_lock(); |
c8c57e84 | 1409 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1410 | goto out; |
1411 | switch (operation) { | |
cb0abe6a | 1412 | case TOMOYO_TYPE_REWRITE: |
c8c57e84 | 1413 | if (!tomoyo_is_no_rewrite_file(&buf)) { |
cb0abe6a TH |
1414 | error = 0; |
1415 | goto out; | |
1416 | } | |
1417 | break; | |
7ef61233 TH |
1418 | case TOMOYO_TYPE_RMDIR: |
1419 | case TOMOYO_TYPE_CHROOT: | |
57c2590f | 1420 | case TOMOYO_TYPE_UMOUNT: |
c8c57e84 TH |
1421 | tomoyo_add_slash(&buf); |
1422 | break; | |
b69a54ee | 1423 | } |
c8c57e84 | 1424 | error = tomoyo_path_permission(&r, operation, &buf); |
b69a54ee | 1425 | out: |
c8c57e84 | 1426 | kfree(buf.name); |
fdb8ebb7 | 1427 | tomoyo_read_unlock(idx); |
cb0abe6a | 1428 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1429 | error = 0; |
1430 | return error; | |
1431 | } | |
1432 | ||
a1f9bb6a TH |
1433 | /** |
1434 | * tomoyo_path_number3_perm2 - Check permission for path/number/number/number operation. | |
1435 | * | |
1436 | * @r: Pointer to "struct tomoyo_request_info". | |
1437 | * @operation: Type of operation. | |
1438 | * @filename: Filename to check. | |
1439 | * @mode: Create mode. | |
1440 | * @dev: Device number. | |
1441 | * | |
1442 | * Returns 0 on success, negative value otherwise. | |
1443 | * | |
1444 | * Caller holds tomoyo_read_lock(). | |
1445 | */ | |
1446 | static int tomoyo_path_number3_perm2(struct tomoyo_request_info *r, | |
1447 | const u8 operation, | |
1448 | const struct tomoyo_path_info *filename, | |
1449 | const unsigned int mode, | |
1450 | const unsigned int dev) | |
1451 | { | |
1452 | int error; | |
17fcfbd9 | 1453 | const char *msg; |
a1f9bb6a TH |
1454 | const unsigned int major = MAJOR(dev); |
1455 | const unsigned int minor = MINOR(dev); | |
1456 | ||
17fcfbd9 TH |
1457 | do { |
1458 | error = tomoyo_path_number3_acl(r, filename, 1 << operation, | |
1459 | mode, major, minor); | |
1460 | if (!error) | |
1461 | break; | |
1462 | msg = tomoyo_path_number32keyword(operation); | |
1463 | tomoyo_warn_log(r, "%s %s 0%o %u %u", msg, filename->name, | |
1464 | mode, major, minor); | |
1465 | error = tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", msg, | |
1466 | tomoyo_file_pattern(filename), mode, | |
1467 | major, minor); | |
1468 | } while (error == TOMOYO_RETRY_REQUEST); | |
1469 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
a1f9bb6a TH |
1470 | error = 0; |
1471 | return error; | |
1472 | } | |
1473 | ||
1474 | /** | |
1475 | * tomoyo_path_number3_perm - Check permission for "mkblock" and "mkchar". | |
1476 | * | |
1477 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
1478 | * @path: Pointer to "struct path". | |
1479 | * @mode: Create mode. | |
1480 | * @dev: Device number. | |
1481 | * | |
1482 | * Returns 0 on success, negative value otherwise. | |
1483 | */ | |
1484 | int tomoyo_path_number3_perm(const u8 operation, struct path *path, | |
1485 | const unsigned int mode, unsigned int dev) | |
1486 | { | |
1487 | struct tomoyo_request_info r; | |
1488 | int error = -ENOMEM; | |
c8c57e84 | 1489 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1490 | int idx; |
1491 | ||
57c2590f TH |
1492 | if (!path->mnt || |
1493 | tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) | |
1494 | == TOMOYO_CONFIG_DISABLED) | |
a1f9bb6a TH |
1495 | return 0; |
1496 | idx = tomoyo_read_lock(); | |
1497 | error = -ENOMEM; | |
c8c57e84 TH |
1498 | if (tomoyo_get_realpath(&buf, path)) { |
1499 | error = tomoyo_path_number3_perm2(&r, operation, &buf, mode, | |
a1f9bb6a | 1500 | new_decode_dev(dev)); |
c8c57e84 | 1501 | kfree(buf.name); |
a1f9bb6a TH |
1502 | } |
1503 | tomoyo_read_unlock(idx); | |
1504 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1505 | error = 0; | |
1506 | return error; | |
1507 | } | |
1508 | ||
b69a54ee | 1509 | /** |
7ef61233 | 1510 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1511 | * |
b69a54ee KT |
1512 | * @operation: Type of operation. |
1513 | * @path1: Pointer to "struct path". | |
1514 | * @path2: Pointer to "struct path". | |
1515 | * | |
1516 | * Returns 0 on success, negative value otherwise. | |
1517 | */ | |
97d6931e | 1518 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1519 | struct path *path2) |
b69a54ee KT |
1520 | { |
1521 | int error = -ENOMEM; | |
17fcfbd9 | 1522 | const char *msg; |
c8c57e84 TH |
1523 | struct tomoyo_path_info buf1; |
1524 | struct tomoyo_path_info buf2; | |
cb0abe6a | 1525 | struct tomoyo_request_info r; |
fdb8ebb7 | 1526 | int idx; |
b69a54ee | 1527 | |
57c2590f TH |
1528 | if (!path1->mnt || !path2->mnt || |
1529 | tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) | |
1530 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1531 | return 0; |
c8c57e84 TH |
1532 | buf1.name = NULL; |
1533 | buf2.name = NULL; | |
fdb8ebb7 | 1534 | idx = tomoyo_read_lock(); |
c8c57e84 TH |
1535 | if (!tomoyo_get_realpath(&buf1, path1) || |
1536 | !tomoyo_get_realpath(&buf2, path2)) | |
b69a54ee | 1537 | goto out; |
57c2590f TH |
1538 | switch (operation) { |
1539 | struct dentry *dentry; | |
1540 | case TOMOYO_TYPE_RENAME: | |
1541 | case TOMOYO_TYPE_LINK: | |
1542 | dentry = path1->dentry; | |
1543 | if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) | |
1544 | break; | |
1545 | /* fall through */ | |
1546 | case TOMOYO_TYPE_PIVOT_ROOT: | |
1547 | tomoyo_add_slash(&buf1); | |
1548 | tomoyo_add_slash(&buf2); | |
1549 | break; | |
1550 | } | |
17fcfbd9 | 1551 | do { |
c8c57e84 | 1552 | error = tomoyo_path2_acl(&r, operation, &buf1, &buf2); |
17fcfbd9 TH |
1553 | if (!error) |
1554 | break; | |
1555 | msg = tomoyo_path22keyword(operation); | |
c8c57e84 | 1556 | tomoyo_warn_log(&r, "%s %s %s", msg, buf1.name, buf2.name); |
17fcfbd9 | 1557 | error = tomoyo_supervisor(&r, "allow_%s %s %s\n", msg, |
c8c57e84 TH |
1558 | tomoyo_file_pattern(&buf1), |
1559 | tomoyo_file_pattern(&buf2)); | |
17fcfbd9 | 1560 | } while (error == TOMOYO_RETRY_REQUEST); |
b69a54ee | 1561 | out: |
c8c57e84 TH |
1562 | kfree(buf1.name); |
1563 | kfree(buf2.name); | |
fdb8ebb7 | 1564 | tomoyo_read_unlock(idx); |
cb0abe6a | 1565 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1566 | error = 0; |
1567 | return error; | |
1568 | } | |
a1f9bb6a TH |
1569 | |
1570 | /** | |
1571 | * tomoyo_write_file_policy - Update file related list. | |
1572 | * | |
1573 | * @data: String to parse. | |
1574 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1575 | * @is_delete: True if it is a delete request. | |
1576 | * | |
1577 | * Returns 0 on success, negative value otherwise. | |
1578 | * | |
1579 | * Caller holds tomoyo_read_lock(). | |
1580 | */ | |
1581 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
1582 | const bool is_delete) | |
1583 | { | |
1584 | char *w[5]; | |
1585 | u8 type; | |
1586 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
1587 | return -EINVAL; | |
1588 | if (strncmp(w[0], "allow_", 6)) { | |
1589 | unsigned int perm; | |
1590 | if (sscanf(w[0], "%u", &perm) == 1) | |
1591 | return tomoyo_update_file_acl((u8) perm, w[1], domain, | |
1592 | is_delete); | |
1593 | goto out; | |
1594 | } | |
1595 | w[0] += 6; | |
1596 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
1597 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
1598 | continue; | |
1599 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
1600 | } | |
1601 | if (!w[2][0]) | |
1602 | goto out; | |
1603 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
1604 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
1605 | continue; | |
1606 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
1607 | is_delete); | |
1608 | } | |
1609 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
1610 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
1611 | continue; | |
1612 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
1613 | is_delete); | |
1614 | } | |
1615 | if (!w[3][0] || !w[4][0]) | |
1616 | goto out; | |
1617 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER3_OPERATION; type++) { | |
1618 | if (strcmp(w[0], tomoyo_path_number3_keyword[type])) | |
1619 | continue; | |
1620 | return tomoyo_update_path_number3_acl(type, w[1], w[2], w[3], | |
1621 | w[4], domain, is_delete); | |
1622 | } | |
1623 | out: | |
1624 | return -EINVAL; | |
1625 | } |