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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; | |
82e0f001 TH |
280 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, |
281 | head.list) { | |
9e4b50e9 | 282 | if (ptr->filename != e.filename) |
b69a54ee | 283 | continue; |
82e0f001 | 284 | ptr->head.is_deleted = is_delete; |
b69a54ee | 285 | error = 0; |
ca0b7df3 | 286 | break; |
b69a54ee | 287 | } |
9e4b50e9 TH |
288 | if (!is_delete && error) { |
289 | struct tomoyo_globally_readable_file_entry *entry = | |
290 | tomoyo_commit_ok(&e, sizeof(e)); | |
291 | if (entry) { | |
82e0f001 | 292 | list_add_tail_rcu(&entry->head.list, |
9e4b50e9 TH |
293 | &tomoyo_globally_readable_list); |
294 | error = 0; | |
295 | } | |
b69a54ee | 296 | } |
f737d95d | 297 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 298 | out: |
9e4b50e9 | 299 | tomoyo_put_name(e.filename); |
b69a54ee KT |
300 | return error; |
301 | } | |
302 | ||
303 | /** | |
304 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
305 | * | |
306 | * @filename: The filename to check. | |
307 | * | |
308 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
309 | * |
310 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
311 | */ |
312 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
313 | filename) | |
314 | { | |
315 | struct tomoyo_globally_readable_file_entry *ptr; | |
316 | bool found = false; | |
fdb8ebb7 | 317 | |
82e0f001 TH |
318 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, |
319 | head.list) { | |
320 | if (!ptr->head.is_deleted && | |
b69a54ee KT |
321 | tomoyo_path_matches_pattern(filename, ptr->filename)) { |
322 | found = true; | |
323 | break; | |
324 | } | |
325 | } | |
b69a54ee KT |
326 | return found; |
327 | } | |
328 | ||
329 | /** | |
330 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
331 | * | |
332 | * @data: String to parse. | |
333 | * @is_delete: True if it is a delete request. | |
334 | * | |
335 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
336 | * |
337 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
338 | */ |
339 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
340 | { | |
341 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
342 | } | |
343 | ||
344 | /** | |
345 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
346 | * | |
347 | * @head: Pointer to "struct tomoyo_io_buffer". | |
348 | * | |
349 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
350 | * |
351 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
352 | */ |
353 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
354 | { | |
355 | struct list_head *pos; | |
356 | bool done = true; | |
357 | ||
b69a54ee KT |
358 | list_for_each_cookie(pos, head->read_var2, |
359 | &tomoyo_globally_readable_list) { | |
360 | struct tomoyo_globally_readable_file_entry *ptr; | |
361 | ptr = list_entry(pos, | |
362 | struct tomoyo_globally_readable_file_entry, | |
82e0f001 TH |
363 | head.list); |
364 | if (ptr->head.is_deleted) | |
b69a54ee | 365 | continue; |
7d2948b1 TH |
366 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
367 | ptr->filename->name); | |
368 | if (!done) | |
b69a54ee | 369 | break; |
b69a54ee | 370 | } |
b69a54ee KT |
371 | return done; |
372 | } | |
373 | ||
c3fa109a TH |
374 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
375 | * converting pathnames to pathname patterns during learning mode. | |
376 | * | |
377 | * An entry is added by | |
378 | * | |
379 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
380 | * /sys/kernel/security/tomoyo/exception_policy | |
381 | * | |
382 | * and is deleted by | |
383 | * | |
384 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
385 | * /sys/kernel/security/tomoyo/exception_policy | |
386 | * | |
387 | * and all entries are retrieved by | |
388 | * | |
389 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
390 | * | |
391 | * In the example above, if a process which belongs to a domain which is in | |
392 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
393 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
394 | * process belongs to. | |
395 | * | |
396 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
397 | * /proc/self/ when current process needs to access only current process's | |
398 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
399 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
400 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
401 | * current process from accessing other process's information. | |
402 | */ | |
847b173e | 403 | LIST_HEAD(tomoyo_pattern_list); |
b69a54ee KT |
404 | |
405 | /** | |
406 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
407 | * | |
408 | * @pattern: Pathname pattern. | |
409 | * @is_delete: True if it is a delete request. | |
410 | * | |
411 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
412 | * |
413 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
414 | */ |
415 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
416 | const bool is_delete) | |
417 | { | |
b69a54ee | 418 | struct tomoyo_pattern_entry *ptr; |
3f629636 | 419 | struct tomoyo_pattern_entry e = { }; |
ca0b7df3 | 420 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 421 | |
3f629636 TH |
422 | if (!tomoyo_is_correct_word(pattern)) |
423 | return -EINVAL; | |
424 | e.pattern = tomoyo_get_name(pattern); | |
9e4b50e9 | 425 | if (!e.pattern) |
ca0b7df3 | 426 | return error; |
29282381 TH |
427 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
428 | goto out; | |
82e0f001 | 429 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, head.list) { |
9e4b50e9 | 430 | if (e.pattern != ptr->pattern) |
b69a54ee | 431 | continue; |
82e0f001 | 432 | ptr->head.is_deleted = is_delete; |
b69a54ee | 433 | error = 0; |
ca0b7df3 | 434 | break; |
b69a54ee | 435 | } |
9e4b50e9 TH |
436 | if (!is_delete && error) { |
437 | struct tomoyo_pattern_entry *entry = | |
438 | tomoyo_commit_ok(&e, sizeof(e)); | |
439 | if (entry) { | |
82e0f001 TH |
440 | list_add_tail_rcu(&entry->head.list, |
441 | &tomoyo_pattern_list); | |
9e4b50e9 TH |
442 | error = 0; |
443 | } | |
b69a54ee | 444 | } |
f737d95d | 445 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 446 | out: |
9e4b50e9 | 447 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
448 | return error; |
449 | } | |
450 | ||
451 | /** | |
17fcfbd9 | 452 | * tomoyo_file_pattern - Get patterned pathname. |
b69a54ee KT |
453 | * |
454 | * @filename: The filename to find patterned pathname. | |
455 | * | |
456 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
457 | * |
458 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 459 | */ |
17fcfbd9 | 460 | const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename) |
b69a54ee KT |
461 | { |
462 | struct tomoyo_pattern_entry *ptr; | |
463 | const struct tomoyo_path_info *pattern = NULL; | |
464 | ||
82e0f001 TH |
465 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, head.list) { |
466 | if (ptr->head.is_deleted) | |
b69a54ee KT |
467 | continue; |
468 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
469 | continue; | |
470 | pattern = ptr->pattern; | |
471 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
472 | /* Do nothing. Try to find the better match. */ | |
473 | } else { | |
474 | /* This would be the better match. Use this. */ | |
475 | break; | |
476 | } | |
477 | } | |
b69a54ee KT |
478 | if (pattern) |
479 | filename = pattern; | |
17fcfbd9 | 480 | return filename->name; |
b69a54ee KT |
481 | } |
482 | ||
483 | /** | |
484 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
485 | * | |
486 | * @data: String to parse. | |
487 | * @is_delete: True if it is a delete request. | |
488 | * | |
489 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
490 | * |
491 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
492 | */ |
493 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
494 | { | |
495 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
496 | } | |
497 | ||
498 | /** | |
499 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
500 | * | |
501 | * @head: Pointer to "struct tomoyo_io_buffer". | |
502 | * | |
503 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
504 | * |
505 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
506 | */ |
507 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
508 | { | |
509 | struct list_head *pos; | |
510 | bool done = true; | |
511 | ||
b69a54ee KT |
512 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
513 | struct tomoyo_pattern_entry *ptr; | |
82e0f001 TH |
514 | ptr = list_entry(pos, struct tomoyo_pattern_entry, head.list); |
515 | if (ptr->head.is_deleted) | |
b69a54ee | 516 | continue; |
7d2948b1 TH |
517 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
518 | "%s\n", ptr->pattern->name); | |
519 | if (!done) | |
b69a54ee | 520 | break; |
b69a54ee | 521 | } |
b69a54ee KT |
522 | return done; |
523 | } | |
524 | ||
c3fa109a TH |
525 | /* |
526 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
527 | * default forbidden to modify already written content of a file. | |
528 | * | |
529 | * An entry is added by | |
530 | * | |
531 | * # echo 'deny_rewrite /var/log/messages' > \ | |
532 | * /sys/kernel/security/tomoyo/exception_policy | |
533 | * | |
534 | * and is deleted by | |
535 | * | |
536 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
537 | * /sys/kernel/security/tomoyo/exception_policy | |
538 | * | |
539 | * and all entries are retrieved by | |
540 | * | |
541 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
542 | * | |
543 | * In the example above, if a process requested to rewrite /var/log/messages , | |
544 | * the process can't rewrite unless the domain which that process belongs to | |
545 | * has "allow_rewrite /var/log/messages" entry. | |
546 | * | |
547 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
548 | * when we want to allow rewriting already unlink()ed file. As of now, | |
549 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
550 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
551 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
552 | * need to worry whether the file is already unlink()ed or not. | |
553 | */ | |
847b173e | 554 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee KT |
555 | |
556 | /** | |
557 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
558 | * | |
559 | * @pattern: Pathname pattern that are not rewritable by default. | |
560 | * @is_delete: True if it is a delete request. | |
561 | * | |
562 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
563 | * |
564 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
565 | */ |
566 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
567 | const bool is_delete) | |
568 | { | |
ca0b7df3 | 569 | struct tomoyo_no_rewrite_entry *ptr; |
9e4b50e9 | 570 | struct tomoyo_no_rewrite_entry e = { }; |
ca0b7df3 | 571 | int error = is_delete ? -ENOENT : -ENOMEM; |
b69a54ee | 572 | |
3f629636 | 573 | if (!tomoyo_is_correct_word(pattern)) |
b69a54ee | 574 | return -EINVAL; |
9e4b50e9 TH |
575 | e.pattern = tomoyo_get_name(pattern); |
576 | if (!e.pattern) | |
ca0b7df3 | 577 | return error; |
29282381 TH |
578 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
579 | goto out; | |
82e0f001 | 580 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, head.list) { |
9e4b50e9 | 581 | if (ptr->pattern != e.pattern) |
b69a54ee | 582 | continue; |
82e0f001 | 583 | ptr->head.is_deleted = is_delete; |
b69a54ee | 584 | error = 0; |
ca0b7df3 | 585 | break; |
b69a54ee | 586 | } |
9e4b50e9 TH |
587 | if (!is_delete && error) { |
588 | struct tomoyo_no_rewrite_entry *entry = | |
589 | tomoyo_commit_ok(&e, sizeof(e)); | |
590 | if (entry) { | |
82e0f001 | 591 | list_add_tail_rcu(&entry->head.list, |
9e4b50e9 TH |
592 | &tomoyo_no_rewrite_list); |
593 | error = 0; | |
594 | } | |
b69a54ee | 595 | } |
f737d95d | 596 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 597 | out: |
9e4b50e9 | 598 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
599 | return error; |
600 | } | |
601 | ||
602 | /** | |
603 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
604 | * | |
605 | * @filename: Filename to check. | |
606 | * | |
607 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
608 | * false otherwise. | |
fdb8ebb7 TH |
609 | * |
610 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
611 | */ |
612 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
613 | { | |
614 | struct tomoyo_no_rewrite_entry *ptr; | |
615 | bool found = false; | |
616 | ||
82e0f001 TH |
617 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, head.list) { |
618 | if (ptr->head.is_deleted) | |
b69a54ee KT |
619 | continue; |
620 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
621 | continue; | |
622 | found = true; | |
623 | break; | |
624 | } | |
b69a54ee KT |
625 | return found; |
626 | } | |
627 | ||
628 | /** | |
629 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
630 | * | |
631 | * @data: String to parse. | |
632 | * @is_delete: True if it is a delete request. | |
633 | * | |
634 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
635 | * |
636 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
637 | */ |
638 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
639 | { | |
640 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
641 | } | |
642 | ||
643 | /** | |
644 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
645 | * | |
646 | * @head: Pointer to "struct tomoyo_io_buffer". | |
647 | * | |
648 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
649 | * |
650 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
651 | */ |
652 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
653 | { | |
654 | struct list_head *pos; | |
655 | bool done = true; | |
656 | ||
b69a54ee KT |
657 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
658 | struct tomoyo_no_rewrite_entry *ptr; | |
82e0f001 TH |
659 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, |
660 | head.list); | |
661 | if (ptr->head.is_deleted) | |
b69a54ee | 662 | continue; |
7d2948b1 TH |
663 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
664 | "%s\n", ptr->pattern->name); | |
665 | if (!done) | |
b69a54ee | 666 | break; |
b69a54ee | 667 | } |
b69a54ee KT |
668 | return done; |
669 | } | |
670 | ||
b69a54ee | 671 | /** |
cb0abe6a | 672 | * tomoyo_path_acl - Check permission for single path operation. |
b69a54ee | 673 | * |
cb0abe6a | 674 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
675 | * @filename: Filename to check. |
676 | * @perm: Permission. | |
b69a54ee KT |
677 | * |
678 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
679 | * |
680 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 681 | */ |
cb0abe6a TH |
682 | static int tomoyo_path_acl(const struct tomoyo_request_info *r, |
683 | const struct tomoyo_path_info *filename, | |
3f629636 | 684 | const u32 perm) |
b69a54ee | 685 | { |
cb0abe6a | 686 | struct tomoyo_domain_info *domain = r->domain; |
b69a54ee KT |
687 | struct tomoyo_acl_info *ptr; |
688 | int error = -EPERM; | |
689 | ||
fdb8ebb7 | 690 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
691 | struct tomoyo_path_acl *acl; |
692 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 693 | continue; |
7ef61233 | 694 | acl = container_of(ptr, struct tomoyo_path_acl, head); |
a1f9bb6a | 695 | if (!(acl->perm & perm) || |
3f629636 | 696 | !tomoyo_compare_name_union(filename, &acl->name)) |
b69a54ee | 697 | continue; |
b69a54ee KT |
698 | error = 0; |
699 | break; | |
700 | } | |
b69a54ee KT |
701 | return error; |
702 | } | |
703 | ||
704 | /** | |
cb0abe6a | 705 | * tomoyo_file_perm - Check permission for opening files. |
b69a54ee | 706 | * |
cb0abe6a | 707 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee | 708 | * @filename: Filename to check. |
cb0abe6a | 709 | * @mode: Mode ("read" or "write" or "read/write" or "execute"). |
b69a54ee KT |
710 | * |
711 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
712 | * |
713 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 714 | */ |
cb0abe6a TH |
715 | static int tomoyo_file_perm(struct tomoyo_request_info *r, |
716 | const struct tomoyo_path_info *filename, | |
717 | const u8 mode) | |
b69a54ee | 718 | { |
b69a54ee KT |
719 | const char *msg = "<unknown>"; |
720 | int error = 0; | |
cb0abe6a | 721 | u32 perm = 0; |
b69a54ee KT |
722 | |
723 | if (!filename) | |
724 | return 0; | |
cb0abe6a TH |
725 | |
726 | if (mode == 6) { | |
7ef61233 | 727 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); |
cb0abe6a TH |
728 | perm = 1 << TOMOYO_TYPE_READ_WRITE; |
729 | } else if (mode == 4) { | |
7ef61233 | 730 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); |
cb0abe6a TH |
731 | perm = 1 << TOMOYO_TYPE_READ; |
732 | } else if (mode == 2) { | |
7ef61233 | 733 | msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); |
cb0abe6a TH |
734 | perm = 1 << TOMOYO_TYPE_WRITE; |
735 | } else if (mode == 1) { | |
7ef61233 | 736 | msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); |
cb0abe6a TH |
737 | perm = 1 << TOMOYO_TYPE_EXECUTE; |
738 | } else | |
b69a54ee | 739 | BUG(); |
17fcfbd9 | 740 | do { |
3f629636 | 741 | error = tomoyo_path_acl(r, filename, perm); |
17fcfbd9 TH |
742 | if (error && mode == 4 && !r->domain->ignore_global_allow_read |
743 | && tomoyo_is_globally_readable_file(filename)) | |
744 | error = 0; | |
745 | if (!error) | |
746 | break; | |
747 | tomoyo_warn_log(r, "%s %s", msg, filename->name); | |
748 | error = tomoyo_supervisor(r, "allow_%s %s\n", msg, | |
17fcfbd9 TH |
749 | tomoyo_file_pattern(filename)); |
750 | /* | |
751 | * Do not retry for execute request, for alias may have | |
752 | * changed. | |
753 | */ | |
754 | } while (error == TOMOYO_RETRY_REQUEST && mode != 1); | |
755 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
cb0abe6a | 756 | error = 0; |
17fcfbd9 | 757 | return error; |
b69a54ee KT |
758 | } |
759 | ||
237ab459 TH |
760 | static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, |
761 | const struct tomoyo_acl_info *b) | |
762 | { | |
763 | const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); | |
764 | const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); | |
765 | return tomoyo_is_same_acl_head(&p1->head, &p2->head) && | |
766 | tomoyo_is_same_name_union(&p1->name, &p2->name); | |
767 | } | |
768 | ||
769 | static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, | |
770 | struct tomoyo_acl_info *b, | |
771 | const bool is_delete) | |
772 | { | |
773 | u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head) | |
774 | ->perm; | |
775 | u16 perm = *a_perm; | |
776 | const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; | |
777 | if (is_delete) { | |
778 | perm &= ~b_perm; | |
779 | if ((perm & TOMOYO_RW_MASK) != TOMOYO_RW_MASK) | |
780 | perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); | |
781 | else if (!(perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
782 | perm &= ~TOMOYO_RW_MASK; | |
783 | } else { | |
784 | perm |= b_perm; | |
785 | if ((perm & TOMOYO_RW_MASK) == TOMOYO_RW_MASK) | |
786 | perm |= (1 << TOMOYO_TYPE_READ_WRITE); | |
787 | else if (perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
788 | perm |= TOMOYO_RW_MASK; | |
789 | } | |
790 | *a_perm = perm; | |
791 | return !perm; | |
792 | } | |
793 | ||
b69a54ee | 794 | /** |
7ef61233 | 795 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
796 | * |
797 | * @type: Type of operation. | |
798 | * @filename: Filename. | |
799 | * @domain: Pointer to "struct tomoyo_domain_info". | |
800 | * @is_delete: True if it is a delete request. | |
801 | * | |
802 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
803 | * |
804 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 805 | */ |
7ef61233 | 806 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
237ab459 | 807 | struct tomoyo_domain_info * const domain, |
7ef61233 | 808 | const bool is_delete) |
b69a54ee | 809 | { |
9e4b50e9 TH |
810 | struct tomoyo_path_acl e = { |
811 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
237ab459 | 812 | .perm = 1 << type |
9e4b50e9 | 813 | }; |
237ab459 TH |
814 | int error; |
815 | if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE)) | |
816 | e.perm |= TOMOYO_RW_MASK; | |
7762fbff | 817 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 818 | return -EINVAL; |
237ab459 TH |
819 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
820 | tomoyo_same_path_acl, | |
821 | tomoyo_merge_path_acl); | |
7762fbff | 822 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
823 | return error; |
824 | } | |
825 | ||
237ab459 TH |
826 | static bool tomoyo_same_path_number3_acl(const struct tomoyo_acl_info *a, |
827 | const struct tomoyo_acl_info *b) | |
828 | { | |
829 | const struct tomoyo_path_number3_acl *p1 = container_of(a, typeof(*p1), | |
830 | head); | |
831 | const struct tomoyo_path_number3_acl *p2 = container_of(b, typeof(*p2), | |
832 | head); | |
833 | return tomoyo_is_same_acl_head(&p1->head, &p2->head) | |
834 | && tomoyo_is_same_name_union(&p1->name, &p2->name) | |
835 | && tomoyo_is_same_number_union(&p1->mode, &p2->mode) | |
836 | && tomoyo_is_same_number_union(&p1->major, &p2->major) | |
837 | && tomoyo_is_same_number_union(&p1->minor, &p2->minor); | |
838 | } | |
839 | ||
840 | static bool tomoyo_merge_path_number3_acl(struct tomoyo_acl_info *a, | |
841 | struct tomoyo_acl_info *b, | |
842 | const bool is_delete) | |
843 | { | |
844 | u8 *const a_perm = &container_of(a, struct tomoyo_path_number3_acl, | |
845 | head)->perm; | |
846 | u8 perm = *a_perm; | |
847 | const u8 b_perm = container_of(b, struct tomoyo_path_number3_acl, head) | |
848 | ->perm; | |
849 | if (is_delete) | |
850 | perm &= ~b_perm; | |
851 | else | |
852 | perm |= b_perm; | |
853 | *a_perm = perm; | |
854 | return !perm; | |
855 | } | |
856 | ||
a1f9bb6a TH |
857 | /** |
858 | * tomoyo_update_path_number3_acl - Update "struct tomoyo_path_number3_acl" list. | |
859 | * | |
860 | * @type: Type of operation. | |
861 | * @filename: Filename. | |
862 | * @mode: Create mode. | |
863 | * @major: Device major number. | |
864 | * @minor: Device minor number. | |
865 | * @domain: Pointer to "struct tomoyo_domain_info". | |
866 | * @is_delete: True if it is a delete request. | |
867 | * | |
868 | * Returns 0 on success, negative value otherwise. | |
237ab459 TH |
869 | * |
870 | * Caller holds tomoyo_read_lock(). | |
a1f9bb6a | 871 | */ |
237ab459 TH |
872 | static int tomoyo_update_path_number3_acl(const u8 type, const char *filename, |
873 | char *mode, char *major, char *minor, | |
874 | struct tomoyo_domain_info * const | |
875 | domain, const bool is_delete) | |
a1f9bb6a | 876 | { |
a1f9bb6a TH |
877 | struct tomoyo_path_number3_acl e = { |
878 | .head.type = TOMOYO_TYPE_PATH_NUMBER3_ACL, | |
237ab459 | 879 | .perm = 1 << type |
a1f9bb6a TH |
880 | }; |
881 | int error = is_delete ? -ENOENT : -ENOMEM; | |
882 | if (!tomoyo_parse_name_union(filename, &e.name) || | |
883 | !tomoyo_parse_number_union(mode, &e.mode) || | |
884 | !tomoyo_parse_number_union(major, &e.major) || | |
885 | !tomoyo_parse_number_union(minor, &e.minor)) | |
886 | goto out; | |
237ab459 TH |
887 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
888 | tomoyo_same_path_number3_acl, | |
889 | tomoyo_merge_path_number3_acl); | |
a1f9bb6a TH |
890 | out: |
891 | tomoyo_put_name_union(&e.name); | |
892 | tomoyo_put_number_union(&e.mode); | |
893 | tomoyo_put_number_union(&e.major); | |
894 | tomoyo_put_number_union(&e.minor); | |
895 | return error; | |
896 | } | |
897 | ||
237ab459 TH |
898 | static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, |
899 | const struct tomoyo_acl_info *b) | |
900 | { | |
901 | const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); | |
902 | const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); | |
903 | return tomoyo_is_same_acl_head(&p1->head, &p2->head) | |
904 | && tomoyo_is_same_name_union(&p1->name1, &p2->name1) | |
905 | && tomoyo_is_same_name_union(&p1->name2, &p2->name2); | |
906 | } | |
907 | ||
908 | static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a, | |
909 | struct tomoyo_acl_info *b, | |
910 | const bool is_delete) | |
911 | { | |
912 | u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head) | |
913 | ->perm; | |
914 | u8 perm = *a_perm; | |
915 | const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm; | |
916 | if (is_delete) | |
917 | perm &= ~b_perm; | |
918 | else | |
919 | perm |= b_perm; | |
920 | *a_perm = perm; | |
921 | return !perm; | |
922 | } | |
923 | ||
b69a54ee | 924 | /** |
7ef61233 | 925 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
926 | * |
927 | * @type: Type of operation. | |
928 | * @filename1: First filename. | |
929 | * @filename2: Second filename. | |
930 | * @domain: Pointer to "struct tomoyo_domain_info". | |
931 | * @is_delete: True if it is a delete request. | |
932 | * | |
933 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
934 | * |
935 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 936 | */ |
7ef61233 TH |
937 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
938 | const char *filename2, | |
237ab459 | 939 | struct tomoyo_domain_info * const domain, |
7ef61233 | 940 | const bool is_delete) |
b69a54ee | 941 | { |
9e4b50e9 TH |
942 | struct tomoyo_path2_acl e = { |
943 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
237ab459 | 944 | .perm = 1 << type |
9e4b50e9 | 945 | }; |
ca0b7df3 | 946 | int error = is_delete ? -ENOENT : -ENOMEM; |
7762fbff TH |
947 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
948 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 949 | goto out; |
237ab459 TH |
950 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
951 | tomoyo_same_path2_acl, | |
952 | tomoyo_merge_path2_acl); | |
ca0b7df3 | 953 | out: |
7762fbff TH |
954 | tomoyo_put_name_union(&e.name1); |
955 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
956 | return error; |
957 | } | |
958 | ||
a1f9bb6a TH |
959 | /** |
960 | * tomoyo_path_number3_acl - Check permission for path/number/number/number operation. | |
961 | * | |
962 | * @r: Pointer to "struct tomoyo_request_info". | |
963 | * @filename: Filename to check. | |
964 | * @perm: Permission. | |
965 | * @mode: Create mode. | |
966 | * @major: Device major number. | |
967 | * @minor: Device minor number. | |
968 | * | |
969 | * Returns 0 on success, -EPERM otherwise. | |
970 | * | |
971 | * Caller holds tomoyo_read_lock(). | |
972 | */ | |
973 | static int tomoyo_path_number3_acl(struct tomoyo_request_info *r, | |
974 | const struct tomoyo_path_info *filename, | |
975 | const u16 perm, const unsigned int mode, | |
976 | const unsigned int major, | |
977 | const unsigned int minor) | |
978 | { | |
979 | struct tomoyo_domain_info *domain = r->domain; | |
980 | struct tomoyo_acl_info *ptr; | |
981 | int error = -EPERM; | |
982 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
983 | struct tomoyo_path_number3_acl *acl; | |
984 | if (ptr->type != TOMOYO_TYPE_PATH_NUMBER3_ACL) | |
985 | continue; | |
986 | acl = container_of(ptr, struct tomoyo_path_number3_acl, head); | |
987 | if (!tomoyo_compare_number_union(mode, &acl->mode)) | |
988 | continue; | |
989 | if (!tomoyo_compare_number_union(major, &acl->major)) | |
990 | continue; | |
991 | if (!tomoyo_compare_number_union(minor, &acl->minor)) | |
992 | continue; | |
993 | if (!(acl->perm & perm)) | |
994 | continue; | |
995 | if (!tomoyo_compare_name_union(filename, &acl->name)) | |
996 | continue; | |
997 | error = 0; | |
998 | break; | |
999 | } | |
1000 | return error; | |
1001 | } | |
1002 | ||
b69a54ee | 1003 | /** |
7ef61233 | 1004 | * tomoyo_path2_acl - Check permission for double path operation. |
b69a54ee | 1005 | * |
cb0abe6a | 1006 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
1007 | * @type: Type of operation. |
1008 | * @filename1: First filename to check. | |
1009 | * @filename2: Second filename to check. | |
1010 | * | |
1011 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
1012 | * |
1013 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1014 | */ |
cb0abe6a | 1015 | static int tomoyo_path2_acl(const struct tomoyo_request_info *r, const u8 type, |
7ef61233 TH |
1016 | const struct tomoyo_path_info *filename1, |
1017 | const struct tomoyo_path_info *filename2) | |
b69a54ee | 1018 | { |
cb0abe6a | 1019 | const struct tomoyo_domain_info *domain = r->domain; |
b69a54ee KT |
1020 | struct tomoyo_acl_info *ptr; |
1021 | const u8 perm = 1 << type; | |
1022 | int error = -EPERM; | |
1023 | ||
fdb8ebb7 | 1024 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
1025 | struct tomoyo_path2_acl *acl; |
1026 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 1027 | continue; |
7ef61233 | 1028 | acl = container_of(ptr, struct tomoyo_path2_acl, head); |
b69a54ee KT |
1029 | if (!(acl->perm & perm)) |
1030 | continue; | |
7762fbff | 1031 | if (!tomoyo_compare_name_union(filename1, &acl->name1)) |
b69a54ee | 1032 | continue; |
7762fbff | 1033 | if (!tomoyo_compare_name_union(filename2, &acl->name2)) |
b69a54ee KT |
1034 | continue; |
1035 | error = 0; | |
1036 | break; | |
1037 | } | |
b69a54ee KT |
1038 | return error; |
1039 | } | |
1040 | ||
1041 | /** | |
cb0abe6a | 1042 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 1043 | * |
cb0abe6a | 1044 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
1045 | * @operation: Type of operation. |
1046 | * @filename: Filename to check. | |
b69a54ee KT |
1047 | * |
1048 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1049 | * |
1050 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1051 | */ |
cb0abe6a TH |
1052 | static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
1053 | const struct tomoyo_path_info *filename) | |
b69a54ee | 1054 | { |
17fcfbd9 | 1055 | const char *msg; |
b69a54ee | 1056 | int error; |
b69a54ee | 1057 | |
b69a54ee | 1058 | next: |
57c2590f TH |
1059 | r->type = tomoyo_p2mac[operation]; |
1060 | r->mode = tomoyo_get_mode(r->profile, r->type); | |
1061 | if (r->mode == TOMOYO_CONFIG_DISABLED) | |
1062 | return 0; | |
17fcfbd9 | 1063 | do { |
3f629636 | 1064 | error = tomoyo_path_acl(r, filename, 1 << operation); |
17fcfbd9 TH |
1065 | if (!error) |
1066 | break; | |
1067 | msg = tomoyo_path2keyword(operation); | |
1068 | tomoyo_warn_log(r, "%s %s", msg, filename->name); | |
1069 | error = tomoyo_supervisor(r, "allow_%s %s\n", msg, | |
1070 | tomoyo_file_pattern(filename)); | |
1071 | } while (error == TOMOYO_RETRY_REQUEST); | |
cb0abe6a | 1072 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee | 1073 | error = 0; |
b69a54ee KT |
1074 | /* |
1075 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1076 | * we need to check "allow_rewrite" permission if the filename is | |
1077 | * specified by "deny_rewrite" keyword. | |
1078 | */ | |
7ef61233 | 1079 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
b69a54ee | 1080 | tomoyo_is_no_rewrite_file(filename)) { |
7ef61233 | 1081 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
1082 | goto next; |
1083 | } | |
1084 | return error; | |
1085 | } | |
1086 | ||
a1f9bb6a TH |
1087 | /** |
1088 | * tomoyo_path_number_acl - Check permission for ioctl/chmod/chown/chgrp operation. | |
1089 | * | |
1090 | * @r: Pointer to "struct tomoyo_request_info". | |
1091 | * @type: Operation. | |
1092 | * @filename: Filename to check. | |
1093 | * @number: Number. | |
1094 | * | |
1095 | * Returns 0 on success, -EPERM otherwise. | |
1096 | * | |
1097 | * Caller holds tomoyo_read_lock(). | |
1098 | */ | |
1099 | static int tomoyo_path_number_acl(struct tomoyo_request_info *r, const u8 type, | |
1100 | const struct tomoyo_path_info *filename, | |
1101 | const unsigned long number) | |
1102 | { | |
1103 | struct tomoyo_domain_info *domain = r->domain; | |
1104 | struct tomoyo_acl_info *ptr; | |
1105 | const u8 perm = 1 << type; | |
1106 | int error = -EPERM; | |
1107 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
1108 | struct tomoyo_path_number_acl *acl; | |
1109 | if (ptr->type != TOMOYO_TYPE_PATH_NUMBER_ACL) | |
1110 | continue; | |
1111 | acl = container_of(ptr, struct tomoyo_path_number_acl, | |
1112 | head); | |
1113 | if (!(acl->perm & perm) || | |
1114 | !tomoyo_compare_number_union(number, &acl->number) || | |
1115 | !tomoyo_compare_name_union(filename, &acl->name)) | |
1116 | continue; | |
1117 | error = 0; | |
1118 | break; | |
1119 | } | |
1120 | return error; | |
1121 | } | |
1122 | ||
237ab459 TH |
1123 | static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, |
1124 | const struct tomoyo_acl_info *b) | |
1125 | { | |
1126 | const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1), | |
1127 | head); | |
1128 | const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), | |
1129 | head); | |
1130 | return tomoyo_is_same_acl_head(&p1->head, &p2->head) | |
1131 | && tomoyo_is_same_name_union(&p1->name, &p2->name) | |
1132 | && tomoyo_is_same_number_union(&p1->number, &p2->number); | |
1133 | } | |
1134 | ||
1135 | static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, | |
1136 | struct tomoyo_acl_info *b, | |
1137 | const bool is_delete) | |
1138 | { | |
1139 | u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl, | |
1140 | head)->perm; | |
1141 | u8 perm = *a_perm; | |
1142 | const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head) | |
1143 | ->perm; | |
1144 | if (is_delete) | |
1145 | perm &= ~b_perm; | |
1146 | else | |
1147 | perm |= b_perm; | |
1148 | *a_perm = perm; | |
1149 | return !perm; | |
1150 | } | |
1151 | ||
a1f9bb6a TH |
1152 | /** |
1153 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. | |
1154 | * | |
1155 | * @type: Type of operation. | |
1156 | * @filename: Filename. | |
1157 | * @number: Number. | |
1158 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1159 | * @is_delete: True if it is a delete request. | |
1160 | * | |
1161 | * Returns 0 on success, negative value otherwise. | |
1162 | */ | |
237ab459 TH |
1163 | static int tomoyo_update_path_number_acl(const u8 type, const char *filename, |
1164 | char *number, | |
1165 | struct tomoyo_domain_info * const | |
1166 | domain, | |
1167 | const bool is_delete) | |
a1f9bb6a | 1168 | { |
a1f9bb6a TH |
1169 | struct tomoyo_path_number_acl e = { |
1170 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
237ab459 | 1171 | .perm = 1 << type |
a1f9bb6a TH |
1172 | }; |
1173 | int error = is_delete ? -ENOENT : -ENOMEM; | |
a1f9bb6a TH |
1174 | if (!tomoyo_parse_name_union(filename, &e.name)) |
1175 | return -EINVAL; | |
1176 | if (!tomoyo_parse_number_union(number, &e.number)) | |
1177 | goto out; | |
237ab459 TH |
1178 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
1179 | tomoyo_same_path_number_acl, | |
1180 | tomoyo_merge_path_number_acl); | |
a1f9bb6a TH |
1181 | out: |
1182 | tomoyo_put_name_union(&e.name); | |
1183 | tomoyo_put_number_union(&e.number); | |
1184 | return error; | |
1185 | } | |
1186 | ||
1187 | /** | |
1188 | * tomoyo_path_number_perm2 - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1189 | * | |
1190 | * @r: Pointer to "strct tomoyo_request_info". | |
1191 | * @filename: Filename to check. | |
1192 | * @number: Number. | |
1193 | * | |
1194 | * Returns 0 on success, negative value otherwise. | |
1195 | * | |
1196 | * Caller holds tomoyo_read_lock(). | |
1197 | */ | |
1198 | static int tomoyo_path_number_perm2(struct tomoyo_request_info *r, | |
1199 | const u8 type, | |
1200 | const struct tomoyo_path_info *filename, | |
1201 | const unsigned long number) | |
1202 | { | |
1203 | char buffer[64]; | |
1204 | int error; | |
1205 | u8 radix; | |
17fcfbd9 | 1206 | const char *msg; |
a1f9bb6a TH |
1207 | |
1208 | if (!filename) | |
1209 | return 0; | |
1210 | switch (type) { | |
1211 | case TOMOYO_TYPE_CREATE: | |
1212 | case TOMOYO_TYPE_MKDIR: | |
1213 | case TOMOYO_TYPE_MKFIFO: | |
1214 | case TOMOYO_TYPE_MKSOCK: | |
1215 | case TOMOYO_TYPE_CHMOD: | |
1216 | radix = TOMOYO_VALUE_TYPE_OCTAL; | |
1217 | break; | |
1218 | case TOMOYO_TYPE_IOCTL: | |
1219 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
1220 | break; | |
1221 | default: | |
1222 | radix = TOMOYO_VALUE_TYPE_DECIMAL; | |
1223 | break; | |
1224 | } | |
1225 | tomoyo_print_ulong(buffer, sizeof(buffer), number, radix); | |
17fcfbd9 TH |
1226 | do { |
1227 | error = tomoyo_path_number_acl(r, type, filename, number); | |
1228 | if (!error) | |
1229 | break; | |
1230 | msg = tomoyo_path_number2keyword(type); | |
1231 | tomoyo_warn_log(r, "%s %s %s", msg, filename->name, buffer); | |
1232 | error = tomoyo_supervisor(r, "allow_%s %s %s\n", msg, | |
1233 | tomoyo_file_pattern(filename), | |
1234 | buffer); | |
1235 | } while (error == TOMOYO_RETRY_REQUEST); | |
a1f9bb6a TH |
1236 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
1237 | error = 0; | |
1238 | return error; | |
1239 | } | |
1240 | ||
1241 | /** | |
1242 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1243 | * | |
1244 | * @type: Type of operation. | |
1245 | * @path: Pointer to "struct path". | |
1246 | * @number: Number. | |
1247 | * | |
1248 | * Returns 0 on success, negative value otherwise. | |
1249 | */ | |
1250 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
1251 | unsigned long number) | |
1252 | { | |
1253 | struct tomoyo_request_info r; | |
1254 | int error = -ENOMEM; | |
c8c57e84 | 1255 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1256 | int idx; |
1257 | ||
57c2590f TH |
1258 | if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
1259 | == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) | |
a1f9bb6a TH |
1260 | return 0; |
1261 | idx = tomoyo_read_lock(); | |
c8c57e84 | 1262 | if (!tomoyo_get_realpath(&buf, path)) |
a1f9bb6a | 1263 | goto out; |
c8c57e84 TH |
1264 | if (type == TOMOYO_TYPE_MKDIR) |
1265 | tomoyo_add_slash(&buf); | |
1266 | error = tomoyo_path_number_perm2(&r, type, &buf, number); | |
a1f9bb6a | 1267 | out: |
c8c57e84 | 1268 | kfree(buf.name); |
a1f9bb6a TH |
1269 | tomoyo_read_unlock(idx); |
1270 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1271 | error = 0; | |
1272 | return error; | |
1273 | } | |
1274 | ||
b69a54ee KT |
1275 | /** |
1276 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1277 | * | |
57c2590f | 1278 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee | 1279 | * @filename: Check permission for "execute". |
b69a54ee KT |
1280 | * |
1281 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1282 | * |
1283 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1284 | */ |
57c2590f | 1285 | int tomoyo_check_exec_perm(struct tomoyo_request_info *r, |
bcb86975 | 1286 | const struct tomoyo_path_info *filename) |
b69a54ee | 1287 | { |
57c2590f | 1288 | if (r->mode == TOMOYO_CONFIG_DISABLED) |
b69a54ee | 1289 | return 0; |
57c2590f | 1290 | return tomoyo_file_perm(r, filename, 1); |
b69a54ee KT |
1291 | } |
1292 | ||
1293 | /** | |
1294 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1295 | * | |
1296 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1297 | * @path: Pointer to "struct path". | |
1298 | * @flag: Flags for open(). | |
1299 | * | |
1300 | * Returns 0 on success, negative value otherwise. | |
1301 | */ | |
1302 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1303 | struct path *path, const int flag) | |
1304 | { | |
1305 | const u8 acc_mode = ACC_MODE(flag); | |
1306 | int error = -ENOMEM; | |
c8c57e84 | 1307 | struct tomoyo_path_info buf; |
cb0abe6a | 1308 | struct tomoyo_request_info r; |
fdb8ebb7 | 1309 | int idx; |
b69a54ee | 1310 | |
57c2590f TH |
1311 | if (!path->mnt || |
1312 | (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))) | |
b69a54ee | 1313 | return 0; |
57c2590f TH |
1314 | buf.name = NULL; |
1315 | r.mode = TOMOYO_CONFIG_DISABLED; | |
fdb8ebb7 | 1316 | idx = tomoyo_read_lock(); |
c8c57e84 | 1317 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1318 | goto out; |
1319 | error = 0; | |
1320 | /* | |
1321 | * If the filename is specified by "deny_rewrite" keyword, | |
1322 | * we need to check "allow_rewrite" permission when the filename is not | |
1323 | * opened for append mode or the filename is truncated at open time. | |
1324 | */ | |
57c2590f TH |
1325 | if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND) |
1326 | && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE) | |
1327 | != TOMOYO_CONFIG_DISABLED) { | |
1328 | if (!tomoyo_get_realpath(&buf, path)) { | |
1329 | error = -ENOMEM; | |
1330 | goto out; | |
1331 | } | |
1332 | if (tomoyo_is_no_rewrite_file(&buf)) | |
1333 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, | |
1334 | &buf); | |
b69a54ee | 1335 | } |
57c2590f TH |
1336 | if (!error && acc_mode && |
1337 | tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) | |
1338 | != TOMOYO_CONFIG_DISABLED) { | |
1339 | if (!buf.name && !tomoyo_get_realpath(&buf, path)) { | |
1340 | error = -ENOMEM; | |
1341 | goto out; | |
1342 | } | |
c8c57e84 | 1343 | error = tomoyo_file_perm(&r, &buf, acc_mode); |
57c2590f | 1344 | } |
b69a54ee | 1345 | out: |
c8c57e84 | 1346 | kfree(buf.name); |
fdb8ebb7 | 1347 | tomoyo_read_unlock(idx); |
cb0abe6a | 1348 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1349 | error = 0; |
1350 | return error; | |
1351 | } | |
1352 | ||
1353 | /** | |
2106ccd9 | 1354 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
b69a54ee | 1355 | * |
b69a54ee KT |
1356 | * @operation: Type of operation. |
1357 | * @path: Pointer to "struct path". | |
1358 | * | |
1359 | * Returns 0 on success, negative value otherwise. | |
1360 | */ | |
97d6931e | 1361 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1362 | { |
1363 | int error = -ENOMEM; | |
c8c57e84 | 1364 | struct tomoyo_path_info buf; |
cb0abe6a | 1365 | struct tomoyo_request_info r; |
fdb8ebb7 | 1366 | int idx; |
b69a54ee | 1367 | |
57c2590f TH |
1368 | if (!path->mnt) |
1369 | return 0; | |
1370 | if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) | |
1371 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1372 | return 0; |
57c2590f | 1373 | buf.name = NULL; |
fdb8ebb7 | 1374 | idx = tomoyo_read_lock(); |
c8c57e84 | 1375 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1376 | goto out; |
1377 | switch (operation) { | |
cb0abe6a | 1378 | case TOMOYO_TYPE_REWRITE: |
c8c57e84 | 1379 | if (!tomoyo_is_no_rewrite_file(&buf)) { |
cb0abe6a TH |
1380 | error = 0; |
1381 | goto out; | |
1382 | } | |
1383 | break; | |
7ef61233 TH |
1384 | case TOMOYO_TYPE_RMDIR: |
1385 | case TOMOYO_TYPE_CHROOT: | |
57c2590f | 1386 | case TOMOYO_TYPE_UMOUNT: |
c8c57e84 TH |
1387 | tomoyo_add_slash(&buf); |
1388 | break; | |
b69a54ee | 1389 | } |
c8c57e84 | 1390 | error = tomoyo_path_permission(&r, operation, &buf); |
b69a54ee | 1391 | out: |
c8c57e84 | 1392 | kfree(buf.name); |
fdb8ebb7 | 1393 | tomoyo_read_unlock(idx); |
cb0abe6a | 1394 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1395 | error = 0; |
1396 | return error; | |
1397 | } | |
1398 | ||
a1f9bb6a TH |
1399 | /** |
1400 | * tomoyo_path_number3_perm2 - Check permission for path/number/number/number operation. | |
1401 | * | |
1402 | * @r: Pointer to "struct tomoyo_request_info". | |
1403 | * @operation: Type of operation. | |
1404 | * @filename: Filename to check. | |
1405 | * @mode: Create mode. | |
1406 | * @dev: Device number. | |
1407 | * | |
1408 | * Returns 0 on success, negative value otherwise. | |
1409 | * | |
1410 | * Caller holds tomoyo_read_lock(). | |
1411 | */ | |
1412 | static int tomoyo_path_number3_perm2(struct tomoyo_request_info *r, | |
1413 | const u8 operation, | |
1414 | const struct tomoyo_path_info *filename, | |
1415 | const unsigned int mode, | |
1416 | const unsigned int dev) | |
1417 | { | |
1418 | int error; | |
17fcfbd9 | 1419 | const char *msg; |
a1f9bb6a TH |
1420 | const unsigned int major = MAJOR(dev); |
1421 | const unsigned int minor = MINOR(dev); | |
1422 | ||
17fcfbd9 TH |
1423 | do { |
1424 | error = tomoyo_path_number3_acl(r, filename, 1 << operation, | |
1425 | mode, major, minor); | |
1426 | if (!error) | |
1427 | break; | |
1428 | msg = tomoyo_path_number32keyword(operation); | |
1429 | tomoyo_warn_log(r, "%s %s 0%o %u %u", msg, filename->name, | |
1430 | mode, major, minor); | |
1431 | error = tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", msg, | |
1432 | tomoyo_file_pattern(filename), mode, | |
1433 | major, minor); | |
1434 | } while (error == TOMOYO_RETRY_REQUEST); | |
1435 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
a1f9bb6a TH |
1436 | error = 0; |
1437 | return error; | |
1438 | } | |
1439 | ||
1440 | /** | |
1441 | * tomoyo_path_number3_perm - Check permission for "mkblock" and "mkchar". | |
1442 | * | |
1443 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
1444 | * @path: Pointer to "struct path". | |
1445 | * @mode: Create mode. | |
1446 | * @dev: Device number. | |
1447 | * | |
1448 | * Returns 0 on success, negative value otherwise. | |
1449 | */ | |
1450 | int tomoyo_path_number3_perm(const u8 operation, struct path *path, | |
1451 | const unsigned int mode, unsigned int dev) | |
1452 | { | |
1453 | struct tomoyo_request_info r; | |
1454 | int error = -ENOMEM; | |
c8c57e84 | 1455 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1456 | int idx; |
1457 | ||
57c2590f TH |
1458 | if (!path->mnt || |
1459 | tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) | |
1460 | == TOMOYO_CONFIG_DISABLED) | |
a1f9bb6a TH |
1461 | return 0; |
1462 | idx = tomoyo_read_lock(); | |
1463 | error = -ENOMEM; | |
c8c57e84 TH |
1464 | if (tomoyo_get_realpath(&buf, path)) { |
1465 | error = tomoyo_path_number3_perm2(&r, operation, &buf, mode, | |
a1f9bb6a | 1466 | new_decode_dev(dev)); |
c8c57e84 | 1467 | kfree(buf.name); |
a1f9bb6a TH |
1468 | } |
1469 | tomoyo_read_unlock(idx); | |
1470 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1471 | error = 0; | |
1472 | return error; | |
1473 | } | |
1474 | ||
b69a54ee | 1475 | /** |
7ef61233 | 1476 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1477 | * |
b69a54ee KT |
1478 | * @operation: Type of operation. |
1479 | * @path1: Pointer to "struct path". | |
1480 | * @path2: Pointer to "struct path". | |
1481 | * | |
1482 | * Returns 0 on success, negative value otherwise. | |
1483 | */ | |
97d6931e | 1484 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1485 | struct path *path2) |
b69a54ee KT |
1486 | { |
1487 | int error = -ENOMEM; | |
17fcfbd9 | 1488 | const char *msg; |
c8c57e84 TH |
1489 | struct tomoyo_path_info buf1; |
1490 | struct tomoyo_path_info buf2; | |
cb0abe6a | 1491 | struct tomoyo_request_info r; |
fdb8ebb7 | 1492 | int idx; |
b69a54ee | 1493 | |
57c2590f TH |
1494 | if (!path1->mnt || !path2->mnt || |
1495 | tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) | |
1496 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1497 | return 0; |
c8c57e84 TH |
1498 | buf1.name = NULL; |
1499 | buf2.name = NULL; | |
fdb8ebb7 | 1500 | idx = tomoyo_read_lock(); |
c8c57e84 TH |
1501 | if (!tomoyo_get_realpath(&buf1, path1) || |
1502 | !tomoyo_get_realpath(&buf2, path2)) | |
b69a54ee | 1503 | goto out; |
57c2590f TH |
1504 | switch (operation) { |
1505 | struct dentry *dentry; | |
1506 | case TOMOYO_TYPE_RENAME: | |
1507 | case TOMOYO_TYPE_LINK: | |
1508 | dentry = path1->dentry; | |
1509 | if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) | |
1510 | break; | |
1511 | /* fall through */ | |
1512 | case TOMOYO_TYPE_PIVOT_ROOT: | |
1513 | tomoyo_add_slash(&buf1); | |
1514 | tomoyo_add_slash(&buf2); | |
1515 | break; | |
1516 | } | |
17fcfbd9 | 1517 | do { |
c8c57e84 | 1518 | error = tomoyo_path2_acl(&r, operation, &buf1, &buf2); |
17fcfbd9 TH |
1519 | if (!error) |
1520 | break; | |
1521 | msg = tomoyo_path22keyword(operation); | |
c8c57e84 | 1522 | tomoyo_warn_log(&r, "%s %s %s", msg, buf1.name, buf2.name); |
17fcfbd9 | 1523 | error = tomoyo_supervisor(&r, "allow_%s %s %s\n", msg, |
c8c57e84 TH |
1524 | tomoyo_file_pattern(&buf1), |
1525 | tomoyo_file_pattern(&buf2)); | |
17fcfbd9 | 1526 | } while (error == TOMOYO_RETRY_REQUEST); |
b69a54ee | 1527 | out: |
c8c57e84 TH |
1528 | kfree(buf1.name); |
1529 | kfree(buf2.name); | |
fdb8ebb7 | 1530 | tomoyo_read_unlock(idx); |
cb0abe6a | 1531 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1532 | error = 0; |
1533 | return error; | |
1534 | } | |
a1f9bb6a TH |
1535 | |
1536 | /** | |
1537 | * tomoyo_write_file_policy - Update file related list. | |
1538 | * | |
1539 | * @data: String to parse. | |
1540 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1541 | * @is_delete: True if it is a delete request. | |
1542 | * | |
1543 | * Returns 0 on success, negative value otherwise. | |
1544 | * | |
1545 | * Caller holds tomoyo_read_lock(). | |
1546 | */ | |
1547 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
1548 | const bool is_delete) | |
1549 | { | |
1550 | char *w[5]; | |
1551 | u8 type; | |
1552 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
1553 | return -EINVAL; | |
237ab459 | 1554 | if (strncmp(w[0], "allow_", 6)) |
a1f9bb6a | 1555 | goto out; |
a1f9bb6a TH |
1556 | w[0] += 6; |
1557 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
1558 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
1559 | continue; | |
1560 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
1561 | } | |
1562 | if (!w[2][0]) | |
1563 | goto out; | |
1564 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
1565 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
1566 | continue; | |
1567 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
1568 | is_delete); | |
1569 | } | |
1570 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
1571 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
1572 | continue; | |
1573 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
1574 | is_delete); | |
1575 | } | |
1576 | if (!w[3][0] || !w[4][0]) | |
1577 | goto out; | |
1578 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER3_OPERATION; type++) { | |
1579 | if (strcmp(w[0], tomoyo_path_number3_keyword[type])) | |
1580 | continue; | |
1581 | return tomoyo_update_path_number3_acl(type, w[1], w[2], w[3], | |
1582 | w[4], domain, is_delete); | |
1583 | } | |
1584 | out: | |
1585 | return -EINVAL; | |
1586 | } |