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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 | 255 | |
36f5e1ff TH |
256 | static bool tomoyo_same_globally_readable(const struct tomoyo_acl_head *a, |
257 | const struct tomoyo_acl_head *b) | |
258 | { | |
259 | return container_of(a, struct tomoyo_globally_readable_file_entry, | |
260 | head)->filename == | |
261 | container_of(b, struct tomoyo_globally_readable_file_entry, | |
262 | head)->filename; | |
263 | } | |
264 | ||
b69a54ee KT |
265 | /** |
266 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
267 | * | |
268 | * @filename: Filename unconditionally permitted to open() for reading. | |
269 | * @is_delete: True if it is a delete request. | |
270 | * | |
271 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
272 | * |
273 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
274 | */ |
275 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
276 | const bool is_delete) | |
277 | { | |
9e4b50e9 | 278 | struct tomoyo_globally_readable_file_entry e = { }; |
36f5e1ff | 279 | int error; |
b69a54ee | 280 | |
3f629636 | 281 | if (!tomoyo_is_correct_word(filename)) |
b69a54ee | 282 | return -EINVAL; |
9e4b50e9 TH |
283 | e.filename = tomoyo_get_name(filename); |
284 | if (!e.filename) | |
b69a54ee | 285 | return -ENOMEM; |
36f5e1ff TH |
286 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
287 | &tomoyo_globally_readable_list, | |
288 | tomoyo_same_globally_readable); | |
9e4b50e9 | 289 | tomoyo_put_name(e.filename); |
b69a54ee KT |
290 | return error; |
291 | } | |
292 | ||
293 | /** | |
294 | * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. | |
295 | * | |
296 | * @filename: The filename to check. | |
297 | * | |
298 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
299 | * |
300 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
301 | */ |
302 | static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * | |
303 | filename) | |
304 | { | |
305 | struct tomoyo_globally_readable_file_entry *ptr; | |
306 | bool found = false; | |
fdb8ebb7 | 307 | |
82e0f001 TH |
308 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, |
309 | head.list) { | |
310 | if (!ptr->head.is_deleted && | |
b69a54ee KT |
311 | tomoyo_path_matches_pattern(filename, ptr->filename)) { |
312 | found = true; | |
313 | break; | |
314 | } | |
315 | } | |
b69a54ee KT |
316 | return found; |
317 | } | |
318 | ||
319 | /** | |
320 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
321 | * | |
322 | * @data: String to parse. | |
323 | * @is_delete: True if it is a delete request. | |
324 | * | |
325 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
326 | * |
327 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
328 | */ |
329 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
330 | { | |
331 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
332 | } | |
333 | ||
334 | /** | |
335 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
336 | * | |
337 | * @head: Pointer to "struct tomoyo_io_buffer". | |
338 | * | |
339 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
340 | * |
341 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
342 | */ |
343 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
344 | { | |
345 | struct list_head *pos; | |
346 | bool done = true; | |
347 | ||
b69a54ee KT |
348 | list_for_each_cookie(pos, head->read_var2, |
349 | &tomoyo_globally_readable_list) { | |
350 | struct tomoyo_globally_readable_file_entry *ptr; | |
351 | ptr = list_entry(pos, | |
352 | struct tomoyo_globally_readable_file_entry, | |
82e0f001 TH |
353 | head.list); |
354 | if (ptr->head.is_deleted) | |
b69a54ee | 355 | continue; |
7d2948b1 TH |
356 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
357 | ptr->filename->name); | |
358 | if (!done) | |
b69a54ee | 359 | break; |
b69a54ee | 360 | } |
b69a54ee KT |
361 | return done; |
362 | } | |
363 | ||
c3fa109a TH |
364 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
365 | * converting pathnames to pathname patterns during learning mode. | |
366 | * | |
367 | * An entry is added by | |
368 | * | |
369 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
370 | * /sys/kernel/security/tomoyo/exception_policy | |
371 | * | |
372 | * and is deleted by | |
373 | * | |
374 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
375 | * /sys/kernel/security/tomoyo/exception_policy | |
376 | * | |
377 | * and all entries are retrieved by | |
378 | * | |
379 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
380 | * | |
381 | * In the example above, if a process which belongs to a domain which is in | |
382 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
383 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
384 | * process belongs to. | |
385 | * | |
386 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
387 | * /proc/self/ when current process needs to access only current process's | |
388 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
389 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
390 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
391 | * current process from accessing other process's information. | |
392 | */ | |
847b173e | 393 | LIST_HEAD(tomoyo_pattern_list); |
b69a54ee | 394 | |
36f5e1ff TH |
395 | static bool tomoyo_same_pattern(const struct tomoyo_acl_head *a, |
396 | const struct tomoyo_acl_head *b) | |
397 | { | |
398 | return container_of(a, struct tomoyo_pattern_entry, head)->pattern == | |
399 | container_of(b, struct tomoyo_pattern_entry, head)->pattern; | |
400 | } | |
401 | ||
b69a54ee KT |
402 | /** |
403 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
404 | * | |
405 | * @pattern: Pathname pattern. | |
406 | * @is_delete: True if it is a delete request. | |
407 | * | |
408 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
409 | * |
410 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
411 | */ |
412 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
413 | const bool is_delete) | |
414 | { | |
3f629636 | 415 | struct tomoyo_pattern_entry e = { }; |
36f5e1ff | 416 | int error; |
b69a54ee | 417 | |
3f629636 TH |
418 | if (!tomoyo_is_correct_word(pattern)) |
419 | return -EINVAL; | |
420 | e.pattern = tomoyo_get_name(pattern); | |
9e4b50e9 | 421 | if (!e.pattern) |
36f5e1ff TH |
422 | return -ENOMEM; |
423 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
424 | &tomoyo_pattern_list, | |
425 | tomoyo_same_pattern); | |
9e4b50e9 | 426 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
427 | return error; |
428 | } | |
429 | ||
430 | /** | |
17fcfbd9 | 431 | * tomoyo_file_pattern - Get patterned pathname. |
b69a54ee KT |
432 | * |
433 | * @filename: The filename to find patterned pathname. | |
434 | * | |
435 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
436 | * |
437 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 438 | */ |
17fcfbd9 | 439 | const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename) |
b69a54ee KT |
440 | { |
441 | struct tomoyo_pattern_entry *ptr; | |
442 | const struct tomoyo_path_info *pattern = NULL; | |
443 | ||
82e0f001 TH |
444 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, head.list) { |
445 | if (ptr->head.is_deleted) | |
b69a54ee KT |
446 | continue; |
447 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
448 | continue; | |
449 | pattern = ptr->pattern; | |
450 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
451 | /* Do nothing. Try to find the better match. */ | |
452 | } else { | |
453 | /* This would be the better match. Use this. */ | |
454 | break; | |
455 | } | |
456 | } | |
b69a54ee KT |
457 | if (pattern) |
458 | filename = pattern; | |
17fcfbd9 | 459 | return filename->name; |
b69a54ee KT |
460 | } |
461 | ||
462 | /** | |
463 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
464 | * | |
465 | * @data: String to parse. | |
466 | * @is_delete: True if it is a delete request. | |
467 | * | |
468 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
469 | * |
470 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
471 | */ |
472 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
473 | { | |
474 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
475 | } | |
476 | ||
477 | /** | |
478 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
479 | * | |
480 | * @head: Pointer to "struct tomoyo_io_buffer". | |
481 | * | |
482 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
483 | * |
484 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
485 | */ |
486 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
487 | { | |
488 | struct list_head *pos; | |
489 | bool done = true; | |
490 | ||
b69a54ee KT |
491 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
492 | struct tomoyo_pattern_entry *ptr; | |
82e0f001 TH |
493 | ptr = list_entry(pos, struct tomoyo_pattern_entry, head.list); |
494 | if (ptr->head.is_deleted) | |
b69a54ee | 495 | continue; |
7d2948b1 TH |
496 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
497 | "%s\n", ptr->pattern->name); | |
498 | if (!done) | |
b69a54ee | 499 | break; |
b69a54ee | 500 | } |
b69a54ee KT |
501 | return done; |
502 | } | |
503 | ||
c3fa109a TH |
504 | /* |
505 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
506 | * default forbidden to modify already written content of a file. | |
507 | * | |
508 | * An entry is added by | |
509 | * | |
510 | * # echo 'deny_rewrite /var/log/messages' > \ | |
511 | * /sys/kernel/security/tomoyo/exception_policy | |
512 | * | |
513 | * and is deleted by | |
514 | * | |
515 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
516 | * /sys/kernel/security/tomoyo/exception_policy | |
517 | * | |
518 | * and all entries are retrieved by | |
519 | * | |
520 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
521 | * | |
522 | * In the example above, if a process requested to rewrite /var/log/messages , | |
523 | * the process can't rewrite unless the domain which that process belongs to | |
524 | * has "allow_rewrite /var/log/messages" entry. | |
525 | * | |
526 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
527 | * when we want to allow rewriting already unlink()ed file. As of now, | |
528 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
529 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
530 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
531 | * need to worry whether the file is already unlink()ed or not. | |
532 | */ | |
847b173e | 533 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee | 534 | |
36f5e1ff TH |
535 | static bool tomoyo_same_no_rewrite(const struct tomoyo_acl_head *a, |
536 | const struct tomoyo_acl_head *b) | |
537 | { | |
538 | return container_of(a, struct tomoyo_no_rewrite_entry, head)->pattern | |
539 | == container_of(b, struct tomoyo_no_rewrite_entry, head) | |
540 | ->pattern; | |
541 | } | |
542 | ||
b69a54ee KT |
543 | /** |
544 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
545 | * | |
546 | * @pattern: Pathname pattern that are not rewritable by default. | |
547 | * @is_delete: True if it is a delete request. | |
548 | * | |
549 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
550 | * |
551 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
552 | */ |
553 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
554 | const bool is_delete) | |
555 | { | |
9e4b50e9 | 556 | struct tomoyo_no_rewrite_entry e = { }; |
36f5e1ff | 557 | int error; |
b69a54ee | 558 | |
3f629636 | 559 | if (!tomoyo_is_correct_word(pattern)) |
b69a54ee | 560 | return -EINVAL; |
9e4b50e9 TH |
561 | e.pattern = tomoyo_get_name(pattern); |
562 | if (!e.pattern) | |
36f5e1ff TH |
563 | return -ENOMEM; |
564 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
565 | &tomoyo_no_rewrite_list, | |
566 | tomoyo_same_no_rewrite); | |
9e4b50e9 | 567 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
568 | return error; |
569 | } | |
570 | ||
571 | /** | |
572 | * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. | |
573 | * | |
574 | * @filename: Filename to check. | |
575 | * | |
576 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
577 | * false otherwise. | |
fdb8ebb7 TH |
578 | * |
579 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
580 | */ |
581 | static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) | |
582 | { | |
583 | struct tomoyo_no_rewrite_entry *ptr; | |
584 | bool found = false; | |
585 | ||
82e0f001 TH |
586 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, head.list) { |
587 | if (ptr->head.is_deleted) | |
b69a54ee KT |
588 | continue; |
589 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
590 | continue; | |
591 | found = true; | |
592 | break; | |
593 | } | |
b69a54ee KT |
594 | return found; |
595 | } | |
596 | ||
597 | /** | |
598 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
599 | * | |
600 | * @data: String to parse. | |
601 | * @is_delete: True if it is a delete request. | |
602 | * | |
603 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
604 | * |
605 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
606 | */ |
607 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
608 | { | |
609 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
610 | } | |
611 | ||
612 | /** | |
613 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
614 | * | |
615 | * @head: Pointer to "struct tomoyo_io_buffer". | |
616 | * | |
617 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
618 | * |
619 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
620 | */ |
621 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
622 | { | |
623 | struct list_head *pos; | |
624 | bool done = true; | |
625 | ||
b69a54ee KT |
626 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
627 | struct tomoyo_no_rewrite_entry *ptr; | |
82e0f001 TH |
628 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, |
629 | head.list); | |
630 | if (ptr->head.is_deleted) | |
b69a54ee | 631 | continue; |
7d2948b1 TH |
632 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
633 | "%s\n", ptr->pattern->name); | |
634 | if (!done) | |
b69a54ee | 635 | break; |
b69a54ee | 636 | } |
b69a54ee KT |
637 | return done; |
638 | } | |
639 | ||
b69a54ee | 640 | /** |
cb0abe6a | 641 | * tomoyo_path_acl - Check permission for single path operation. |
b69a54ee | 642 | * |
cb0abe6a | 643 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
644 | * @filename: Filename to check. |
645 | * @perm: Permission. | |
b69a54ee KT |
646 | * |
647 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
648 | * |
649 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 650 | */ |
cb0abe6a TH |
651 | static int tomoyo_path_acl(const struct tomoyo_request_info *r, |
652 | const struct tomoyo_path_info *filename, | |
3f629636 | 653 | const u32 perm) |
b69a54ee | 654 | { |
cb0abe6a | 655 | struct tomoyo_domain_info *domain = r->domain; |
b69a54ee KT |
656 | struct tomoyo_acl_info *ptr; |
657 | int error = -EPERM; | |
658 | ||
fdb8ebb7 | 659 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
660 | struct tomoyo_path_acl *acl; |
661 | if (ptr->type != TOMOYO_TYPE_PATH_ACL) | |
b69a54ee | 662 | continue; |
7ef61233 | 663 | acl = container_of(ptr, struct tomoyo_path_acl, head); |
a1f9bb6a | 664 | if (!(acl->perm & perm) || |
3f629636 | 665 | !tomoyo_compare_name_union(filename, &acl->name)) |
b69a54ee | 666 | continue; |
b69a54ee KT |
667 | error = 0; |
668 | break; | |
669 | } | |
b69a54ee KT |
670 | return error; |
671 | } | |
672 | ||
673 | /** | |
cb0abe6a | 674 | * tomoyo_file_perm - Check permission for opening files. |
b69a54ee | 675 | * |
cb0abe6a | 676 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee | 677 | * @filename: Filename to check. |
cb0abe6a | 678 | * @mode: Mode ("read" or "write" or "read/write" or "execute"). |
b69a54ee KT |
679 | * |
680 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
681 | * |
682 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 683 | */ |
cb0abe6a TH |
684 | static int tomoyo_file_perm(struct tomoyo_request_info *r, |
685 | const struct tomoyo_path_info *filename, | |
686 | const u8 mode) | |
b69a54ee | 687 | { |
b69a54ee KT |
688 | const char *msg = "<unknown>"; |
689 | int error = 0; | |
cb0abe6a | 690 | u32 perm = 0; |
b69a54ee KT |
691 | |
692 | if (!filename) | |
693 | return 0; | |
cb0abe6a TH |
694 | |
695 | if (mode == 6) { | |
7ef61233 | 696 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); |
cb0abe6a TH |
697 | perm = 1 << TOMOYO_TYPE_READ_WRITE; |
698 | } else if (mode == 4) { | |
7ef61233 | 699 | msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); |
cb0abe6a TH |
700 | perm = 1 << TOMOYO_TYPE_READ; |
701 | } else if (mode == 2) { | |
7ef61233 | 702 | msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); |
cb0abe6a TH |
703 | perm = 1 << TOMOYO_TYPE_WRITE; |
704 | } else if (mode == 1) { | |
7ef61233 | 705 | msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); |
cb0abe6a TH |
706 | perm = 1 << TOMOYO_TYPE_EXECUTE; |
707 | } else | |
b69a54ee | 708 | BUG(); |
17fcfbd9 | 709 | do { |
3f629636 | 710 | error = tomoyo_path_acl(r, filename, perm); |
17fcfbd9 TH |
711 | if (error && mode == 4 && !r->domain->ignore_global_allow_read |
712 | && tomoyo_is_globally_readable_file(filename)) | |
713 | error = 0; | |
714 | if (!error) | |
715 | break; | |
716 | tomoyo_warn_log(r, "%s %s", msg, filename->name); | |
717 | error = tomoyo_supervisor(r, "allow_%s %s\n", msg, | |
17fcfbd9 TH |
718 | tomoyo_file_pattern(filename)); |
719 | /* | |
720 | * Do not retry for execute request, for alias may have | |
721 | * changed. | |
722 | */ | |
723 | } while (error == TOMOYO_RETRY_REQUEST && mode != 1); | |
724 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
cb0abe6a | 725 | error = 0; |
17fcfbd9 | 726 | return error; |
b69a54ee KT |
727 | } |
728 | ||
237ab459 TH |
729 | static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, |
730 | const struct tomoyo_acl_info *b) | |
731 | { | |
732 | const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); | |
733 | const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); | |
734 | return tomoyo_is_same_acl_head(&p1->head, &p2->head) && | |
735 | tomoyo_is_same_name_union(&p1->name, &p2->name); | |
736 | } | |
737 | ||
738 | static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, | |
739 | struct tomoyo_acl_info *b, | |
740 | const bool is_delete) | |
741 | { | |
742 | u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head) | |
743 | ->perm; | |
744 | u16 perm = *a_perm; | |
745 | const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; | |
746 | if (is_delete) { | |
747 | perm &= ~b_perm; | |
748 | if ((perm & TOMOYO_RW_MASK) != TOMOYO_RW_MASK) | |
749 | perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); | |
750 | else if (!(perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
751 | perm &= ~TOMOYO_RW_MASK; | |
752 | } else { | |
753 | perm |= b_perm; | |
754 | if ((perm & TOMOYO_RW_MASK) == TOMOYO_RW_MASK) | |
755 | perm |= (1 << TOMOYO_TYPE_READ_WRITE); | |
756 | else if (perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
757 | perm |= TOMOYO_RW_MASK; | |
758 | } | |
759 | *a_perm = perm; | |
760 | return !perm; | |
761 | } | |
762 | ||
b69a54ee | 763 | /** |
7ef61233 | 764 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
765 | * |
766 | * @type: Type of operation. | |
767 | * @filename: Filename. | |
768 | * @domain: Pointer to "struct tomoyo_domain_info". | |
769 | * @is_delete: True if it is a delete request. | |
770 | * | |
771 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
772 | * |
773 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 774 | */ |
7ef61233 | 775 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
237ab459 | 776 | struct tomoyo_domain_info * const domain, |
7ef61233 | 777 | const bool is_delete) |
b69a54ee | 778 | { |
9e4b50e9 TH |
779 | struct tomoyo_path_acl e = { |
780 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
237ab459 | 781 | .perm = 1 << type |
9e4b50e9 | 782 | }; |
237ab459 TH |
783 | int error; |
784 | if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE)) | |
785 | e.perm |= TOMOYO_RW_MASK; | |
7762fbff | 786 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 787 | return -EINVAL; |
237ab459 TH |
788 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
789 | tomoyo_same_path_acl, | |
790 | tomoyo_merge_path_acl); | |
7762fbff | 791 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
792 | return error; |
793 | } | |
794 | ||
237ab459 TH |
795 | static bool tomoyo_same_path_number3_acl(const struct tomoyo_acl_info *a, |
796 | const struct tomoyo_acl_info *b) | |
797 | { | |
798 | const struct tomoyo_path_number3_acl *p1 = container_of(a, typeof(*p1), | |
799 | head); | |
800 | const struct tomoyo_path_number3_acl *p2 = container_of(b, typeof(*p2), | |
801 | head); | |
802 | return tomoyo_is_same_acl_head(&p1->head, &p2->head) | |
803 | && tomoyo_is_same_name_union(&p1->name, &p2->name) | |
804 | && tomoyo_is_same_number_union(&p1->mode, &p2->mode) | |
805 | && tomoyo_is_same_number_union(&p1->major, &p2->major) | |
806 | && tomoyo_is_same_number_union(&p1->minor, &p2->minor); | |
807 | } | |
808 | ||
809 | static bool tomoyo_merge_path_number3_acl(struct tomoyo_acl_info *a, | |
810 | struct tomoyo_acl_info *b, | |
811 | const bool is_delete) | |
812 | { | |
813 | u8 *const a_perm = &container_of(a, struct tomoyo_path_number3_acl, | |
814 | head)->perm; | |
815 | u8 perm = *a_perm; | |
816 | const u8 b_perm = container_of(b, struct tomoyo_path_number3_acl, head) | |
817 | ->perm; | |
818 | if (is_delete) | |
819 | perm &= ~b_perm; | |
820 | else | |
821 | perm |= b_perm; | |
822 | *a_perm = perm; | |
823 | return !perm; | |
824 | } | |
825 | ||
a1f9bb6a TH |
826 | /** |
827 | * tomoyo_update_path_number3_acl - Update "struct tomoyo_path_number3_acl" list. | |
828 | * | |
829 | * @type: Type of operation. | |
830 | * @filename: Filename. | |
831 | * @mode: Create mode. | |
832 | * @major: Device major number. | |
833 | * @minor: Device minor number. | |
834 | * @domain: Pointer to "struct tomoyo_domain_info". | |
835 | * @is_delete: True if it is a delete request. | |
836 | * | |
837 | * Returns 0 on success, negative value otherwise. | |
237ab459 TH |
838 | * |
839 | * Caller holds tomoyo_read_lock(). | |
a1f9bb6a | 840 | */ |
237ab459 TH |
841 | static int tomoyo_update_path_number3_acl(const u8 type, const char *filename, |
842 | char *mode, char *major, char *minor, | |
843 | struct tomoyo_domain_info * const | |
844 | domain, const bool is_delete) | |
a1f9bb6a | 845 | { |
a1f9bb6a TH |
846 | struct tomoyo_path_number3_acl e = { |
847 | .head.type = TOMOYO_TYPE_PATH_NUMBER3_ACL, | |
237ab459 | 848 | .perm = 1 << type |
a1f9bb6a TH |
849 | }; |
850 | int error = is_delete ? -ENOENT : -ENOMEM; | |
851 | if (!tomoyo_parse_name_union(filename, &e.name) || | |
852 | !tomoyo_parse_number_union(mode, &e.mode) || | |
853 | !tomoyo_parse_number_union(major, &e.major) || | |
854 | !tomoyo_parse_number_union(minor, &e.minor)) | |
855 | goto out; | |
237ab459 TH |
856 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
857 | tomoyo_same_path_number3_acl, | |
858 | tomoyo_merge_path_number3_acl); | |
a1f9bb6a TH |
859 | out: |
860 | tomoyo_put_name_union(&e.name); | |
861 | tomoyo_put_number_union(&e.mode); | |
862 | tomoyo_put_number_union(&e.major); | |
863 | tomoyo_put_number_union(&e.minor); | |
864 | return error; | |
865 | } | |
866 | ||
237ab459 TH |
867 | static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, |
868 | const struct tomoyo_acl_info *b) | |
869 | { | |
870 | const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); | |
871 | const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); | |
872 | return tomoyo_is_same_acl_head(&p1->head, &p2->head) | |
873 | && tomoyo_is_same_name_union(&p1->name1, &p2->name1) | |
874 | && tomoyo_is_same_name_union(&p1->name2, &p2->name2); | |
875 | } | |
876 | ||
877 | static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a, | |
878 | struct tomoyo_acl_info *b, | |
879 | const bool is_delete) | |
880 | { | |
881 | u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head) | |
882 | ->perm; | |
883 | u8 perm = *a_perm; | |
884 | const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm; | |
885 | if (is_delete) | |
886 | perm &= ~b_perm; | |
887 | else | |
888 | perm |= b_perm; | |
889 | *a_perm = perm; | |
890 | return !perm; | |
891 | } | |
892 | ||
b69a54ee | 893 | /** |
7ef61233 | 894 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
895 | * |
896 | * @type: Type of operation. | |
897 | * @filename1: First filename. | |
898 | * @filename2: Second filename. | |
899 | * @domain: Pointer to "struct tomoyo_domain_info". | |
900 | * @is_delete: True if it is a delete request. | |
901 | * | |
902 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
903 | * |
904 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 905 | */ |
7ef61233 TH |
906 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
907 | const char *filename2, | |
237ab459 | 908 | struct tomoyo_domain_info * const domain, |
7ef61233 | 909 | const bool is_delete) |
b69a54ee | 910 | { |
9e4b50e9 TH |
911 | struct tomoyo_path2_acl e = { |
912 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
237ab459 | 913 | .perm = 1 << type |
9e4b50e9 | 914 | }; |
ca0b7df3 | 915 | int error = is_delete ? -ENOENT : -ENOMEM; |
7762fbff TH |
916 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
917 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 918 | goto out; |
237ab459 TH |
919 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
920 | tomoyo_same_path2_acl, | |
921 | tomoyo_merge_path2_acl); | |
ca0b7df3 | 922 | out: |
7762fbff TH |
923 | tomoyo_put_name_union(&e.name1); |
924 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
925 | return error; |
926 | } | |
927 | ||
a1f9bb6a TH |
928 | /** |
929 | * tomoyo_path_number3_acl - Check permission for path/number/number/number operation. | |
930 | * | |
931 | * @r: Pointer to "struct tomoyo_request_info". | |
932 | * @filename: Filename to check. | |
933 | * @perm: Permission. | |
934 | * @mode: Create mode. | |
935 | * @major: Device major number. | |
936 | * @minor: Device minor number. | |
937 | * | |
938 | * Returns 0 on success, -EPERM otherwise. | |
939 | * | |
940 | * Caller holds tomoyo_read_lock(). | |
941 | */ | |
942 | static int tomoyo_path_number3_acl(struct tomoyo_request_info *r, | |
943 | const struct tomoyo_path_info *filename, | |
944 | const u16 perm, const unsigned int mode, | |
945 | const unsigned int major, | |
946 | const unsigned int minor) | |
947 | { | |
948 | struct tomoyo_domain_info *domain = r->domain; | |
949 | struct tomoyo_acl_info *ptr; | |
950 | int error = -EPERM; | |
951 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
952 | struct tomoyo_path_number3_acl *acl; | |
953 | if (ptr->type != TOMOYO_TYPE_PATH_NUMBER3_ACL) | |
954 | continue; | |
955 | acl = container_of(ptr, struct tomoyo_path_number3_acl, head); | |
956 | if (!tomoyo_compare_number_union(mode, &acl->mode)) | |
957 | continue; | |
958 | if (!tomoyo_compare_number_union(major, &acl->major)) | |
959 | continue; | |
960 | if (!tomoyo_compare_number_union(minor, &acl->minor)) | |
961 | continue; | |
962 | if (!(acl->perm & perm)) | |
963 | continue; | |
964 | if (!tomoyo_compare_name_union(filename, &acl->name)) | |
965 | continue; | |
966 | error = 0; | |
967 | break; | |
968 | } | |
969 | return error; | |
970 | } | |
971 | ||
b69a54ee | 972 | /** |
7ef61233 | 973 | * tomoyo_path2_acl - Check permission for double path operation. |
b69a54ee | 974 | * |
cb0abe6a | 975 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
976 | * @type: Type of operation. |
977 | * @filename1: First filename to check. | |
978 | * @filename2: Second filename to check. | |
979 | * | |
980 | * Returns 0 on success, -EPERM otherwise. | |
fdb8ebb7 TH |
981 | * |
982 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 983 | */ |
cb0abe6a | 984 | static int tomoyo_path2_acl(const struct tomoyo_request_info *r, const u8 type, |
7ef61233 TH |
985 | const struct tomoyo_path_info *filename1, |
986 | const struct tomoyo_path_info *filename2) | |
b69a54ee | 987 | { |
cb0abe6a | 988 | const struct tomoyo_domain_info *domain = r->domain; |
b69a54ee KT |
989 | struct tomoyo_acl_info *ptr; |
990 | const u8 perm = 1 << type; | |
991 | int error = -EPERM; | |
992 | ||
fdb8ebb7 | 993 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
7ef61233 TH |
994 | struct tomoyo_path2_acl *acl; |
995 | if (ptr->type != TOMOYO_TYPE_PATH2_ACL) | |
b69a54ee | 996 | continue; |
7ef61233 | 997 | acl = container_of(ptr, struct tomoyo_path2_acl, head); |
b69a54ee KT |
998 | if (!(acl->perm & perm)) |
999 | continue; | |
7762fbff | 1000 | if (!tomoyo_compare_name_union(filename1, &acl->name1)) |
b69a54ee | 1001 | continue; |
7762fbff | 1002 | if (!tomoyo_compare_name_union(filename2, &acl->name2)) |
b69a54ee KT |
1003 | continue; |
1004 | error = 0; | |
1005 | break; | |
1006 | } | |
b69a54ee KT |
1007 | return error; |
1008 | } | |
1009 | ||
1010 | /** | |
cb0abe6a | 1011 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 1012 | * |
cb0abe6a | 1013 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
1014 | * @operation: Type of operation. |
1015 | * @filename: Filename to check. | |
b69a54ee KT |
1016 | * |
1017 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1018 | * |
1019 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1020 | */ |
cb0abe6a TH |
1021 | static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
1022 | const struct tomoyo_path_info *filename) | |
b69a54ee | 1023 | { |
17fcfbd9 | 1024 | const char *msg; |
b69a54ee | 1025 | int error; |
b69a54ee | 1026 | |
b69a54ee | 1027 | next: |
57c2590f TH |
1028 | r->type = tomoyo_p2mac[operation]; |
1029 | r->mode = tomoyo_get_mode(r->profile, r->type); | |
1030 | if (r->mode == TOMOYO_CONFIG_DISABLED) | |
1031 | return 0; | |
17fcfbd9 | 1032 | do { |
3f629636 | 1033 | error = tomoyo_path_acl(r, filename, 1 << operation); |
17fcfbd9 TH |
1034 | if (!error) |
1035 | break; | |
1036 | msg = tomoyo_path2keyword(operation); | |
1037 | tomoyo_warn_log(r, "%s %s", msg, filename->name); | |
1038 | error = tomoyo_supervisor(r, "allow_%s %s\n", msg, | |
1039 | tomoyo_file_pattern(filename)); | |
1040 | } while (error == TOMOYO_RETRY_REQUEST); | |
cb0abe6a | 1041 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee | 1042 | error = 0; |
b69a54ee KT |
1043 | /* |
1044 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
1045 | * we need to check "allow_rewrite" permission if the filename is | |
1046 | * specified by "deny_rewrite" keyword. | |
1047 | */ | |
7ef61233 | 1048 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
b69a54ee | 1049 | tomoyo_is_no_rewrite_file(filename)) { |
7ef61233 | 1050 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
1051 | goto next; |
1052 | } | |
1053 | return error; | |
1054 | } | |
1055 | ||
a1f9bb6a TH |
1056 | /** |
1057 | * tomoyo_path_number_acl - Check permission for ioctl/chmod/chown/chgrp operation. | |
1058 | * | |
1059 | * @r: Pointer to "struct tomoyo_request_info". | |
1060 | * @type: Operation. | |
1061 | * @filename: Filename to check. | |
1062 | * @number: Number. | |
1063 | * | |
1064 | * Returns 0 on success, -EPERM otherwise. | |
1065 | * | |
1066 | * Caller holds tomoyo_read_lock(). | |
1067 | */ | |
1068 | static int tomoyo_path_number_acl(struct tomoyo_request_info *r, const u8 type, | |
1069 | const struct tomoyo_path_info *filename, | |
1070 | const unsigned long number) | |
1071 | { | |
1072 | struct tomoyo_domain_info *domain = r->domain; | |
1073 | struct tomoyo_acl_info *ptr; | |
1074 | const u8 perm = 1 << type; | |
1075 | int error = -EPERM; | |
1076 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
1077 | struct tomoyo_path_number_acl *acl; | |
1078 | if (ptr->type != TOMOYO_TYPE_PATH_NUMBER_ACL) | |
1079 | continue; | |
1080 | acl = container_of(ptr, struct tomoyo_path_number_acl, | |
1081 | head); | |
1082 | if (!(acl->perm & perm) || | |
1083 | !tomoyo_compare_number_union(number, &acl->number) || | |
1084 | !tomoyo_compare_name_union(filename, &acl->name)) | |
1085 | continue; | |
1086 | error = 0; | |
1087 | break; | |
1088 | } | |
1089 | return error; | |
1090 | } | |
1091 | ||
237ab459 TH |
1092 | static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, |
1093 | const struct tomoyo_acl_info *b) | |
1094 | { | |
1095 | const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1), | |
1096 | head); | |
1097 | const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), | |
1098 | head); | |
1099 | return tomoyo_is_same_acl_head(&p1->head, &p2->head) | |
1100 | && tomoyo_is_same_name_union(&p1->name, &p2->name) | |
1101 | && tomoyo_is_same_number_union(&p1->number, &p2->number); | |
1102 | } | |
1103 | ||
1104 | static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, | |
1105 | struct tomoyo_acl_info *b, | |
1106 | const bool is_delete) | |
1107 | { | |
1108 | u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl, | |
1109 | head)->perm; | |
1110 | u8 perm = *a_perm; | |
1111 | const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head) | |
1112 | ->perm; | |
1113 | if (is_delete) | |
1114 | perm &= ~b_perm; | |
1115 | else | |
1116 | perm |= b_perm; | |
1117 | *a_perm = perm; | |
1118 | return !perm; | |
1119 | } | |
1120 | ||
a1f9bb6a TH |
1121 | /** |
1122 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. | |
1123 | * | |
1124 | * @type: Type of operation. | |
1125 | * @filename: Filename. | |
1126 | * @number: Number. | |
1127 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1128 | * @is_delete: True if it is a delete request. | |
1129 | * | |
1130 | * Returns 0 on success, negative value otherwise. | |
1131 | */ | |
237ab459 TH |
1132 | static int tomoyo_update_path_number_acl(const u8 type, const char *filename, |
1133 | char *number, | |
1134 | struct tomoyo_domain_info * const | |
1135 | domain, | |
1136 | const bool is_delete) | |
a1f9bb6a | 1137 | { |
a1f9bb6a TH |
1138 | struct tomoyo_path_number_acl e = { |
1139 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
237ab459 | 1140 | .perm = 1 << type |
a1f9bb6a TH |
1141 | }; |
1142 | int error = is_delete ? -ENOENT : -ENOMEM; | |
a1f9bb6a TH |
1143 | if (!tomoyo_parse_name_union(filename, &e.name)) |
1144 | return -EINVAL; | |
1145 | if (!tomoyo_parse_number_union(number, &e.number)) | |
1146 | goto out; | |
237ab459 TH |
1147 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
1148 | tomoyo_same_path_number_acl, | |
1149 | tomoyo_merge_path_number_acl); | |
a1f9bb6a TH |
1150 | out: |
1151 | tomoyo_put_name_union(&e.name); | |
1152 | tomoyo_put_number_union(&e.number); | |
1153 | return error; | |
1154 | } | |
1155 | ||
1156 | /** | |
1157 | * tomoyo_path_number_perm2 - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1158 | * | |
1159 | * @r: Pointer to "strct tomoyo_request_info". | |
1160 | * @filename: Filename to check. | |
1161 | * @number: Number. | |
1162 | * | |
1163 | * Returns 0 on success, negative value otherwise. | |
1164 | * | |
1165 | * Caller holds tomoyo_read_lock(). | |
1166 | */ | |
1167 | static int tomoyo_path_number_perm2(struct tomoyo_request_info *r, | |
1168 | const u8 type, | |
1169 | const struct tomoyo_path_info *filename, | |
1170 | const unsigned long number) | |
1171 | { | |
1172 | char buffer[64]; | |
1173 | int error; | |
1174 | u8 radix; | |
17fcfbd9 | 1175 | const char *msg; |
a1f9bb6a TH |
1176 | |
1177 | if (!filename) | |
1178 | return 0; | |
1179 | switch (type) { | |
1180 | case TOMOYO_TYPE_CREATE: | |
1181 | case TOMOYO_TYPE_MKDIR: | |
1182 | case TOMOYO_TYPE_MKFIFO: | |
1183 | case TOMOYO_TYPE_MKSOCK: | |
1184 | case TOMOYO_TYPE_CHMOD: | |
1185 | radix = TOMOYO_VALUE_TYPE_OCTAL; | |
1186 | break; | |
1187 | case TOMOYO_TYPE_IOCTL: | |
1188 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
1189 | break; | |
1190 | default: | |
1191 | radix = TOMOYO_VALUE_TYPE_DECIMAL; | |
1192 | break; | |
1193 | } | |
1194 | tomoyo_print_ulong(buffer, sizeof(buffer), number, radix); | |
17fcfbd9 TH |
1195 | do { |
1196 | error = tomoyo_path_number_acl(r, type, filename, number); | |
1197 | if (!error) | |
1198 | break; | |
1199 | msg = tomoyo_path_number2keyword(type); | |
1200 | tomoyo_warn_log(r, "%s %s %s", msg, filename->name, buffer); | |
1201 | error = tomoyo_supervisor(r, "allow_%s %s %s\n", msg, | |
1202 | tomoyo_file_pattern(filename), | |
1203 | buffer); | |
1204 | } while (error == TOMOYO_RETRY_REQUEST); | |
a1f9bb6a TH |
1205 | if (r->mode != TOMOYO_CONFIG_ENFORCING) |
1206 | error = 0; | |
1207 | return error; | |
1208 | } | |
1209 | ||
1210 | /** | |
1211 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1212 | * | |
1213 | * @type: Type of operation. | |
1214 | * @path: Pointer to "struct path". | |
1215 | * @number: Number. | |
1216 | * | |
1217 | * Returns 0 on success, negative value otherwise. | |
1218 | */ | |
1219 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
1220 | unsigned long number) | |
1221 | { | |
1222 | struct tomoyo_request_info r; | |
1223 | int error = -ENOMEM; | |
c8c57e84 | 1224 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1225 | int idx; |
1226 | ||
57c2590f TH |
1227 | if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
1228 | == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) | |
a1f9bb6a TH |
1229 | return 0; |
1230 | idx = tomoyo_read_lock(); | |
c8c57e84 | 1231 | if (!tomoyo_get_realpath(&buf, path)) |
a1f9bb6a | 1232 | goto out; |
c8c57e84 TH |
1233 | if (type == TOMOYO_TYPE_MKDIR) |
1234 | tomoyo_add_slash(&buf); | |
1235 | error = tomoyo_path_number_perm2(&r, type, &buf, number); | |
a1f9bb6a | 1236 | out: |
c8c57e84 | 1237 | kfree(buf.name); |
a1f9bb6a TH |
1238 | tomoyo_read_unlock(idx); |
1239 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1240 | error = 0; | |
1241 | return error; | |
1242 | } | |
1243 | ||
b69a54ee KT |
1244 | /** |
1245 | * tomoyo_check_exec_perm - Check permission for "execute". | |
1246 | * | |
57c2590f | 1247 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee | 1248 | * @filename: Check permission for "execute". |
b69a54ee KT |
1249 | * |
1250 | * Returns 0 on success, negativevalue otherwise. | |
fdb8ebb7 TH |
1251 | * |
1252 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 1253 | */ |
57c2590f | 1254 | int tomoyo_check_exec_perm(struct tomoyo_request_info *r, |
bcb86975 | 1255 | const struct tomoyo_path_info *filename) |
b69a54ee | 1256 | { |
57c2590f | 1257 | if (r->mode == TOMOYO_CONFIG_DISABLED) |
b69a54ee | 1258 | return 0; |
57c2590f | 1259 | return tomoyo_file_perm(r, filename, 1); |
b69a54ee KT |
1260 | } |
1261 | ||
1262 | /** | |
1263 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1264 | * | |
1265 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1266 | * @path: Pointer to "struct path". | |
1267 | * @flag: Flags for open(). | |
1268 | * | |
1269 | * Returns 0 on success, negative value otherwise. | |
1270 | */ | |
1271 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1272 | struct path *path, const int flag) | |
1273 | { | |
1274 | const u8 acc_mode = ACC_MODE(flag); | |
1275 | int error = -ENOMEM; | |
c8c57e84 | 1276 | struct tomoyo_path_info buf; |
cb0abe6a | 1277 | struct tomoyo_request_info r; |
fdb8ebb7 | 1278 | int idx; |
b69a54ee | 1279 | |
57c2590f TH |
1280 | if (!path->mnt || |
1281 | (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))) | |
b69a54ee | 1282 | return 0; |
57c2590f TH |
1283 | buf.name = NULL; |
1284 | r.mode = TOMOYO_CONFIG_DISABLED; | |
fdb8ebb7 | 1285 | idx = tomoyo_read_lock(); |
c8c57e84 | 1286 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1287 | goto out; |
1288 | error = 0; | |
1289 | /* | |
1290 | * If the filename is specified by "deny_rewrite" keyword, | |
1291 | * we need to check "allow_rewrite" permission when the filename is not | |
1292 | * opened for append mode or the filename is truncated at open time. | |
1293 | */ | |
57c2590f TH |
1294 | if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND) |
1295 | && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE) | |
1296 | != TOMOYO_CONFIG_DISABLED) { | |
1297 | if (!tomoyo_get_realpath(&buf, path)) { | |
1298 | error = -ENOMEM; | |
1299 | goto out; | |
1300 | } | |
1301 | if (tomoyo_is_no_rewrite_file(&buf)) | |
1302 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, | |
1303 | &buf); | |
b69a54ee | 1304 | } |
57c2590f TH |
1305 | if (!error && acc_mode && |
1306 | tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) | |
1307 | != TOMOYO_CONFIG_DISABLED) { | |
1308 | if (!buf.name && !tomoyo_get_realpath(&buf, path)) { | |
1309 | error = -ENOMEM; | |
1310 | goto out; | |
1311 | } | |
c8c57e84 | 1312 | error = tomoyo_file_perm(&r, &buf, acc_mode); |
57c2590f | 1313 | } |
b69a54ee | 1314 | out: |
c8c57e84 | 1315 | kfree(buf.name); |
fdb8ebb7 | 1316 | tomoyo_read_unlock(idx); |
cb0abe6a | 1317 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1318 | error = 0; |
1319 | return error; | |
1320 | } | |
1321 | ||
1322 | /** | |
2106ccd9 | 1323 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
b69a54ee | 1324 | * |
b69a54ee KT |
1325 | * @operation: Type of operation. |
1326 | * @path: Pointer to "struct path". | |
1327 | * | |
1328 | * Returns 0 on success, negative value otherwise. | |
1329 | */ | |
97d6931e | 1330 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1331 | { |
1332 | int error = -ENOMEM; | |
c8c57e84 | 1333 | struct tomoyo_path_info buf; |
cb0abe6a | 1334 | struct tomoyo_request_info r; |
fdb8ebb7 | 1335 | int idx; |
b69a54ee | 1336 | |
57c2590f TH |
1337 | if (!path->mnt) |
1338 | return 0; | |
1339 | if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) | |
1340 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1341 | return 0; |
57c2590f | 1342 | buf.name = NULL; |
fdb8ebb7 | 1343 | idx = tomoyo_read_lock(); |
c8c57e84 | 1344 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1345 | goto out; |
1346 | switch (operation) { | |
cb0abe6a | 1347 | case TOMOYO_TYPE_REWRITE: |
c8c57e84 | 1348 | if (!tomoyo_is_no_rewrite_file(&buf)) { |
cb0abe6a TH |
1349 | error = 0; |
1350 | goto out; | |
1351 | } | |
1352 | break; | |
7ef61233 TH |
1353 | case TOMOYO_TYPE_RMDIR: |
1354 | case TOMOYO_TYPE_CHROOT: | |
57c2590f | 1355 | case TOMOYO_TYPE_UMOUNT: |
c8c57e84 TH |
1356 | tomoyo_add_slash(&buf); |
1357 | break; | |
b69a54ee | 1358 | } |
c8c57e84 | 1359 | error = tomoyo_path_permission(&r, operation, &buf); |
b69a54ee | 1360 | out: |
c8c57e84 | 1361 | kfree(buf.name); |
fdb8ebb7 | 1362 | tomoyo_read_unlock(idx); |
cb0abe6a | 1363 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1364 | error = 0; |
1365 | return error; | |
1366 | } | |
1367 | ||
a1f9bb6a TH |
1368 | /** |
1369 | * tomoyo_path_number3_perm2 - Check permission for path/number/number/number operation. | |
1370 | * | |
1371 | * @r: Pointer to "struct tomoyo_request_info". | |
1372 | * @operation: Type of operation. | |
1373 | * @filename: Filename to check. | |
1374 | * @mode: Create mode. | |
1375 | * @dev: Device number. | |
1376 | * | |
1377 | * Returns 0 on success, negative value otherwise. | |
1378 | * | |
1379 | * Caller holds tomoyo_read_lock(). | |
1380 | */ | |
1381 | static int tomoyo_path_number3_perm2(struct tomoyo_request_info *r, | |
1382 | const u8 operation, | |
1383 | const struct tomoyo_path_info *filename, | |
1384 | const unsigned int mode, | |
1385 | const unsigned int dev) | |
1386 | { | |
1387 | int error; | |
17fcfbd9 | 1388 | const char *msg; |
a1f9bb6a TH |
1389 | const unsigned int major = MAJOR(dev); |
1390 | const unsigned int minor = MINOR(dev); | |
1391 | ||
17fcfbd9 TH |
1392 | do { |
1393 | error = tomoyo_path_number3_acl(r, filename, 1 << operation, | |
1394 | mode, major, minor); | |
1395 | if (!error) | |
1396 | break; | |
1397 | msg = tomoyo_path_number32keyword(operation); | |
1398 | tomoyo_warn_log(r, "%s %s 0%o %u %u", msg, filename->name, | |
1399 | mode, major, minor); | |
1400 | error = tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", msg, | |
1401 | tomoyo_file_pattern(filename), mode, | |
1402 | major, minor); | |
1403 | } while (error == TOMOYO_RETRY_REQUEST); | |
1404 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
a1f9bb6a TH |
1405 | error = 0; |
1406 | return error; | |
1407 | } | |
1408 | ||
1409 | /** | |
1410 | * tomoyo_path_number3_perm - Check permission for "mkblock" and "mkchar". | |
1411 | * | |
1412 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
1413 | * @path: Pointer to "struct path". | |
1414 | * @mode: Create mode. | |
1415 | * @dev: Device number. | |
1416 | * | |
1417 | * Returns 0 on success, negative value otherwise. | |
1418 | */ | |
1419 | int tomoyo_path_number3_perm(const u8 operation, struct path *path, | |
1420 | const unsigned int mode, unsigned int dev) | |
1421 | { | |
1422 | struct tomoyo_request_info r; | |
1423 | int error = -ENOMEM; | |
c8c57e84 | 1424 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1425 | int idx; |
1426 | ||
57c2590f TH |
1427 | if (!path->mnt || |
1428 | tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) | |
1429 | == TOMOYO_CONFIG_DISABLED) | |
a1f9bb6a TH |
1430 | return 0; |
1431 | idx = tomoyo_read_lock(); | |
1432 | error = -ENOMEM; | |
c8c57e84 TH |
1433 | if (tomoyo_get_realpath(&buf, path)) { |
1434 | error = tomoyo_path_number3_perm2(&r, operation, &buf, mode, | |
a1f9bb6a | 1435 | new_decode_dev(dev)); |
c8c57e84 | 1436 | kfree(buf.name); |
a1f9bb6a TH |
1437 | } |
1438 | tomoyo_read_unlock(idx); | |
1439 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1440 | error = 0; | |
1441 | return error; | |
1442 | } | |
1443 | ||
b69a54ee | 1444 | /** |
7ef61233 | 1445 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1446 | * |
b69a54ee KT |
1447 | * @operation: Type of operation. |
1448 | * @path1: Pointer to "struct path". | |
1449 | * @path2: Pointer to "struct path". | |
1450 | * | |
1451 | * Returns 0 on success, negative value otherwise. | |
1452 | */ | |
97d6931e | 1453 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1454 | struct path *path2) |
b69a54ee KT |
1455 | { |
1456 | int error = -ENOMEM; | |
17fcfbd9 | 1457 | const char *msg; |
c8c57e84 TH |
1458 | struct tomoyo_path_info buf1; |
1459 | struct tomoyo_path_info buf2; | |
cb0abe6a | 1460 | struct tomoyo_request_info r; |
fdb8ebb7 | 1461 | int idx; |
b69a54ee | 1462 | |
57c2590f TH |
1463 | if (!path1->mnt || !path2->mnt || |
1464 | tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) | |
1465 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1466 | return 0; |
c8c57e84 TH |
1467 | buf1.name = NULL; |
1468 | buf2.name = NULL; | |
fdb8ebb7 | 1469 | idx = tomoyo_read_lock(); |
c8c57e84 TH |
1470 | if (!tomoyo_get_realpath(&buf1, path1) || |
1471 | !tomoyo_get_realpath(&buf2, path2)) | |
b69a54ee | 1472 | goto out; |
57c2590f TH |
1473 | switch (operation) { |
1474 | struct dentry *dentry; | |
1475 | case TOMOYO_TYPE_RENAME: | |
1476 | case TOMOYO_TYPE_LINK: | |
1477 | dentry = path1->dentry; | |
1478 | if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) | |
1479 | break; | |
1480 | /* fall through */ | |
1481 | case TOMOYO_TYPE_PIVOT_ROOT: | |
1482 | tomoyo_add_slash(&buf1); | |
1483 | tomoyo_add_slash(&buf2); | |
1484 | break; | |
1485 | } | |
17fcfbd9 | 1486 | do { |
c8c57e84 | 1487 | error = tomoyo_path2_acl(&r, operation, &buf1, &buf2); |
17fcfbd9 TH |
1488 | if (!error) |
1489 | break; | |
1490 | msg = tomoyo_path22keyword(operation); | |
c8c57e84 | 1491 | tomoyo_warn_log(&r, "%s %s %s", msg, buf1.name, buf2.name); |
17fcfbd9 | 1492 | error = tomoyo_supervisor(&r, "allow_%s %s %s\n", msg, |
c8c57e84 TH |
1493 | tomoyo_file_pattern(&buf1), |
1494 | tomoyo_file_pattern(&buf2)); | |
17fcfbd9 | 1495 | } while (error == TOMOYO_RETRY_REQUEST); |
b69a54ee | 1496 | out: |
c8c57e84 TH |
1497 | kfree(buf1.name); |
1498 | kfree(buf2.name); | |
fdb8ebb7 | 1499 | tomoyo_read_unlock(idx); |
cb0abe6a | 1500 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1501 | error = 0; |
1502 | return error; | |
1503 | } | |
a1f9bb6a TH |
1504 | |
1505 | /** | |
1506 | * tomoyo_write_file_policy - Update file related list. | |
1507 | * | |
1508 | * @data: String to parse. | |
1509 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1510 | * @is_delete: True if it is a delete request. | |
1511 | * | |
1512 | * Returns 0 on success, negative value otherwise. | |
1513 | * | |
1514 | * Caller holds tomoyo_read_lock(). | |
1515 | */ | |
1516 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
1517 | const bool is_delete) | |
1518 | { | |
1519 | char *w[5]; | |
1520 | u8 type; | |
1521 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
1522 | return -EINVAL; | |
237ab459 | 1523 | if (strncmp(w[0], "allow_", 6)) |
a1f9bb6a | 1524 | goto out; |
a1f9bb6a TH |
1525 | w[0] += 6; |
1526 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
1527 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
1528 | continue; | |
1529 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
1530 | } | |
1531 | if (!w[2][0]) | |
1532 | goto out; | |
1533 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
1534 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
1535 | continue; | |
1536 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
1537 | is_delete); | |
1538 | } | |
1539 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
1540 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
1541 | continue; | |
1542 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
1543 | is_delete); | |
1544 | } | |
1545 | if (!w[3][0] || !w[4][0]) | |
1546 | goto out; | |
1547 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER3_OPERATION; type++) { | |
1548 | if (strcmp(w[0], tomoyo_path_number3_keyword[type])) | |
1549 | continue; | |
1550 | return tomoyo_update_path_number3_acl(type, w[1], w[2], w[3], | |
1551 | w[4], domain, is_delete); | |
1552 | } | |
1553 | out: | |
1554 | return -EINVAL; | |
1555 | } |