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Commit | Line | Data |
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b69a54ee KT |
1 | /* |
2 | * security/tomoyo/file.c | |
3 | * | |
c3ef1500 | 4 | * Pathname restriction functions. |
b69a54ee | 5 | * |
c3ef1500 | 6 | * Copyright (C) 2005-2010 NTT DATA CORPORATION |
b69a54ee KT |
7 | */ |
8 | ||
9 | #include "common.h" | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
b69a54ee | 11 | |
a1f9bb6a | 12 | /* Keyword array for operations with one pathname. */ |
71c28236 | 13 | const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { |
7ef61233 TH |
14 | [TOMOYO_TYPE_READ_WRITE] = "read/write", |
15 | [TOMOYO_TYPE_EXECUTE] = "execute", | |
16 | [TOMOYO_TYPE_READ] = "read", | |
17 | [TOMOYO_TYPE_WRITE] = "write", | |
7ef61233 | 18 | [TOMOYO_TYPE_UNLINK] = "unlink", |
7ef61233 | 19 | [TOMOYO_TYPE_RMDIR] = "rmdir", |
7ef61233 TH |
20 | [TOMOYO_TYPE_TRUNCATE] = "truncate", |
21 | [TOMOYO_TYPE_SYMLINK] = "symlink", | |
22 | [TOMOYO_TYPE_REWRITE] = "rewrite", | |
7ef61233 | 23 | [TOMOYO_TYPE_CHROOT] = "chroot", |
7ef61233 | 24 | [TOMOYO_TYPE_UMOUNT] = "unmount", |
b69a54ee KT |
25 | }; |
26 | ||
a1f9bb6a | 27 | /* Keyword array for operations with one pathname and three numbers. */ |
71c28236 | 28 | const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION] = { |
a1f9bb6a TH |
29 | [TOMOYO_TYPE_MKBLOCK] = "mkblock", |
30 | [TOMOYO_TYPE_MKCHAR] = "mkchar", | |
31 | }; | |
32 | ||
33 | /* Keyword array for operations with two pathnames. */ | |
71c28236 | 34 | const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { |
a1f9bb6a TH |
35 | [TOMOYO_TYPE_LINK] = "link", |
36 | [TOMOYO_TYPE_RENAME] = "rename", | |
7ef61233 | 37 | [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", |
b69a54ee KT |
38 | }; |
39 | ||
a1f9bb6a | 40 | /* Keyword array for operations with one pathname and one number. */ |
71c28236 | 41 | const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { |
a1f9bb6a TH |
42 | [TOMOYO_TYPE_CREATE] = "create", |
43 | [TOMOYO_TYPE_MKDIR] = "mkdir", | |
44 | [TOMOYO_TYPE_MKFIFO] = "mkfifo", | |
45 | [TOMOYO_TYPE_MKSOCK] = "mksock", | |
46 | [TOMOYO_TYPE_IOCTL] = "ioctl", | |
47 | [TOMOYO_TYPE_CHMOD] = "chmod", | |
48 | [TOMOYO_TYPE_CHOWN] = "chown", | |
49 | [TOMOYO_TYPE_CHGRP] = "chgrp", | |
50 | }; | |
51 | ||
57c2590f TH |
52 | static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = { |
53 | [TOMOYO_TYPE_READ_WRITE] = TOMOYO_MAC_FILE_OPEN, | |
54 | [TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE, | |
55 | [TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN, | |
56 | [TOMOYO_TYPE_WRITE] = TOMOYO_MAC_FILE_OPEN, | |
57 | [TOMOYO_TYPE_UNLINK] = TOMOYO_MAC_FILE_UNLINK, | |
58 | [TOMOYO_TYPE_RMDIR] = TOMOYO_MAC_FILE_RMDIR, | |
59 | [TOMOYO_TYPE_TRUNCATE] = TOMOYO_MAC_FILE_TRUNCATE, | |
60 | [TOMOYO_TYPE_SYMLINK] = TOMOYO_MAC_FILE_SYMLINK, | |
61 | [TOMOYO_TYPE_REWRITE] = TOMOYO_MAC_FILE_REWRITE, | |
62 | [TOMOYO_TYPE_CHROOT] = TOMOYO_MAC_FILE_CHROOT, | |
63 | [TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT, | |
64 | }; | |
65 | ||
75093152 | 66 | static const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = { |
57c2590f TH |
67 | [TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK, |
68 | [TOMOYO_TYPE_MKCHAR] = TOMOYO_MAC_FILE_MKCHAR, | |
69 | }; | |
70 | ||
71 | static const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = { | |
72 | [TOMOYO_TYPE_LINK] = TOMOYO_MAC_FILE_LINK, | |
73 | [TOMOYO_TYPE_RENAME] = TOMOYO_MAC_FILE_RENAME, | |
74 | [TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT, | |
75 | }; | |
76 | ||
77 | static const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { | |
78 | [TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE, | |
79 | [TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR, | |
80 | [TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO, | |
81 | [TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK, | |
82 | [TOMOYO_TYPE_IOCTL] = TOMOYO_MAC_FILE_IOCTL, | |
83 | [TOMOYO_TYPE_CHMOD] = TOMOYO_MAC_FILE_CHMOD, | |
84 | [TOMOYO_TYPE_CHOWN] = TOMOYO_MAC_FILE_CHOWN, | |
85 | [TOMOYO_TYPE_CHGRP] = TOMOYO_MAC_FILE_CHGRP, | |
86 | }; | |
87 | ||
7762fbff TH |
88 | void tomoyo_put_name_union(struct tomoyo_name_union *ptr) |
89 | { | |
90 | if (!ptr) | |
91 | return; | |
92 | if (ptr->is_group) | |
a98aa4de | 93 | tomoyo_put_group(ptr->group); |
7762fbff TH |
94 | else |
95 | tomoyo_put_name(ptr->filename); | |
96 | } | |
97 | ||
98 | bool tomoyo_compare_name_union(const struct tomoyo_path_info *name, | |
99 | const struct tomoyo_name_union *ptr) | |
100 | { | |
101 | if (ptr->is_group) | |
3f629636 | 102 | return tomoyo_path_matches_group(name, ptr->group); |
7762fbff TH |
103 | return tomoyo_path_matches_pattern(name, ptr->filename); |
104 | } | |
105 | ||
4c3e9e2d TH |
106 | void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
107 | { | |
108 | if (ptr && ptr->is_group) | |
a98aa4de | 109 | tomoyo_put_group(ptr->group); |
4c3e9e2d TH |
110 | } |
111 | ||
112 | bool tomoyo_compare_number_union(const unsigned long value, | |
113 | const struct tomoyo_number_union *ptr) | |
114 | { | |
115 | if (ptr->is_group) | |
116 | return tomoyo_number_matches_group(value, value, ptr->group); | |
117 | return value >= ptr->values[0] && value <= ptr->values[1]; | |
118 | } | |
119 | ||
c8c57e84 TH |
120 | static void tomoyo_add_slash(struct tomoyo_path_info *buf) |
121 | { | |
122 | if (buf->is_dir) | |
123 | return; | |
124 | /* | |
125 | * This is OK because tomoyo_encode() reserves space for appending "/". | |
126 | */ | |
127 | strcat((char *) buf->name, "/"); | |
128 | tomoyo_fill_path_info(buf); | |
129 | } | |
130 | ||
b69a54ee KT |
131 | /** |
132 | * tomoyo_strendswith - Check whether the token ends with the given token. | |
133 | * | |
134 | * @name: The token to check. | |
135 | * @tail: The token to find. | |
136 | * | |
137 | * Returns true if @name ends with @tail, false otherwise. | |
138 | */ | |
139 | static bool tomoyo_strendswith(const char *name, const char *tail) | |
140 | { | |
141 | int len; | |
142 | ||
143 | if (!name || !tail) | |
144 | return false; | |
145 | len = strlen(name) - strlen(tail); | |
146 | return len >= 0 && !strcmp(name + len, tail); | |
147 | } | |
148 | ||
149 | /** | |
c8c57e84 | 150 | * tomoyo_get_realpath - Get realpath. |
b69a54ee | 151 | * |
c8c57e84 | 152 | * @buf: Pointer to "struct tomoyo_path_info". |
b69a54ee KT |
153 | * @path: Pointer to "struct path". |
154 | * | |
c8c57e84 | 155 | * Returns true on success, false otherwise. |
b69a54ee | 156 | */ |
c8c57e84 | 157 | static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path) |
b69a54ee | 158 | { |
c8c57e84 TH |
159 | buf->name = tomoyo_realpath_from_path(path); |
160 | if (buf->name) { | |
161 | tomoyo_fill_path_info(buf); | |
162 | return true; | |
b69a54ee | 163 | } |
c8c57e84 | 164 | return false; |
b69a54ee KT |
165 | } |
166 | ||
99a85259 TH |
167 | /** |
168 | * tomoyo_audit_path_log - Audit path request log. | |
169 | * | |
170 | * @r: Pointer to "struct tomoyo_request_info". | |
171 | * | |
172 | * Returns 0 on success, negative value otherwise. | |
173 | */ | |
174 | static int tomoyo_audit_path_log(struct tomoyo_request_info *r) | |
175 | { | |
176 | const char *operation = tomoyo_path_keyword[r->param.path.operation]; | |
177 | const struct tomoyo_path_info *filename = r->param.path.filename; | |
178 | if (r->granted) | |
179 | return 0; | |
180 | tomoyo_warn_log(r, "%s %s", operation, filename->name); | |
181 | return tomoyo_supervisor(r, "allow_%s %s\n", operation, | |
182 | tomoyo_file_pattern(filename)); | |
183 | } | |
184 | ||
185 | /** | |
186 | * tomoyo_audit_path2_log - Audit path/path request log. | |
187 | * | |
188 | * @r: Pointer to "struct tomoyo_request_info". | |
189 | * | |
190 | * Returns 0 on success, negative value otherwise. | |
191 | */ | |
192 | static int tomoyo_audit_path2_log(struct tomoyo_request_info *r) | |
193 | { | |
194 | const char *operation = tomoyo_path2_keyword[r->param.path2.operation]; | |
195 | const struct tomoyo_path_info *filename1 = r->param.path2.filename1; | |
196 | const struct tomoyo_path_info *filename2 = r->param.path2.filename2; | |
197 | if (r->granted) | |
198 | return 0; | |
199 | tomoyo_warn_log(r, "%s %s %s", operation, filename1->name, | |
200 | filename2->name); | |
201 | return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, | |
202 | tomoyo_file_pattern(filename1), | |
203 | tomoyo_file_pattern(filename2)); | |
204 | } | |
205 | ||
206 | /** | |
207 | * tomoyo_audit_mkdev_log - Audit path/number/number/number request log. | |
208 | * | |
209 | * @r: Pointer to "struct tomoyo_request_info". | |
210 | * | |
211 | * Returns 0 on success, negative value otherwise. | |
212 | */ | |
213 | static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r) | |
214 | { | |
71c28236 | 215 | const char *operation = tomoyo_mkdev_keyword[r->param.mkdev.operation]; |
99a85259 TH |
216 | const struct tomoyo_path_info *filename = r->param.mkdev.filename; |
217 | const unsigned int major = r->param.mkdev.major; | |
218 | const unsigned int minor = r->param.mkdev.minor; | |
219 | const unsigned int mode = r->param.mkdev.mode; | |
220 | if (r->granted) | |
221 | return 0; | |
222 | tomoyo_warn_log(r, "%s %s 0%o %u %u", operation, filename->name, mode, | |
223 | major, minor); | |
224 | return tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", operation, | |
225 | tomoyo_file_pattern(filename), mode, major, | |
226 | minor); | |
227 | } | |
228 | ||
229 | /** | |
230 | * tomoyo_audit_path_number_log - Audit path/number request log. | |
231 | * | |
232 | * @r: Pointer to "struct tomoyo_request_info". | |
233 | * @error: Error code. | |
234 | * | |
235 | * Returns 0 on success, negative value otherwise. | |
236 | */ | |
237 | static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r) | |
238 | { | |
239 | const u8 type = r->param.path_number.operation; | |
240 | u8 radix; | |
241 | const struct tomoyo_path_info *filename = r->param.path_number.filename; | |
242 | const char *operation = tomoyo_path_number_keyword[type]; | |
243 | char buffer[64]; | |
244 | if (r->granted) | |
245 | return 0; | |
246 | switch (type) { | |
247 | case TOMOYO_TYPE_CREATE: | |
248 | case TOMOYO_TYPE_MKDIR: | |
249 | case TOMOYO_TYPE_MKFIFO: | |
250 | case TOMOYO_TYPE_MKSOCK: | |
251 | case TOMOYO_TYPE_CHMOD: | |
252 | radix = TOMOYO_VALUE_TYPE_OCTAL; | |
253 | break; | |
254 | case TOMOYO_TYPE_IOCTL: | |
255 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
256 | break; | |
257 | default: | |
258 | radix = TOMOYO_VALUE_TYPE_DECIMAL; | |
259 | break; | |
260 | } | |
261 | tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number, | |
262 | radix); | |
263 | tomoyo_warn_log(r, "%s %s %s", operation, filename->name, buffer); | |
264 | return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, | |
265 | tomoyo_file_pattern(filename), buffer); | |
266 | } | |
267 | ||
c3fa109a TH |
268 | /* |
269 | * tomoyo_globally_readable_list is used for holding list of pathnames which | |
270 | * are by default allowed to be open()ed for reading by any process. | |
271 | * | |
272 | * An entry is added by | |
273 | * | |
274 | * # echo 'allow_read /lib/libc-2.5.so' > \ | |
275 | * /sys/kernel/security/tomoyo/exception_policy | |
276 | * | |
277 | * and is deleted by | |
278 | * | |
279 | * # echo 'delete allow_read /lib/libc-2.5.so' > \ | |
280 | * /sys/kernel/security/tomoyo/exception_policy | |
281 | * | |
282 | * and all entries are retrieved by | |
283 | * | |
284 | * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy | |
285 | * | |
286 | * In the example above, any process is allowed to | |
287 | * open("/lib/libc-2.5.so", O_RDONLY). | |
288 | * One exception is, if the domain which current process belongs to is marked | |
289 | * as "ignore_global_allow_read", current process can't do so unless explicitly | |
290 | * given "allow_read /lib/libc-2.5.so" to the domain which current process | |
291 | * belongs to. | |
292 | */ | |
847b173e | 293 | LIST_HEAD(tomoyo_globally_readable_list); |
b69a54ee | 294 | |
36f5e1ff TH |
295 | static bool tomoyo_same_globally_readable(const struct tomoyo_acl_head *a, |
296 | const struct tomoyo_acl_head *b) | |
297 | { | |
298 | return container_of(a, struct tomoyo_globally_readable_file_entry, | |
299 | head)->filename == | |
300 | container_of(b, struct tomoyo_globally_readable_file_entry, | |
301 | head)->filename; | |
302 | } | |
303 | ||
b69a54ee KT |
304 | /** |
305 | * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. | |
306 | * | |
307 | * @filename: Filename unconditionally permitted to open() for reading. | |
308 | * @is_delete: True if it is a delete request. | |
309 | * | |
310 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
311 | * |
312 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
313 | */ |
314 | static int tomoyo_update_globally_readable_entry(const char *filename, | |
315 | const bool is_delete) | |
316 | { | |
9e4b50e9 | 317 | struct tomoyo_globally_readable_file_entry e = { }; |
36f5e1ff | 318 | int error; |
b69a54ee | 319 | |
75093152 | 320 | if (!tomoyo_correct_word(filename)) |
b69a54ee | 321 | return -EINVAL; |
9e4b50e9 TH |
322 | e.filename = tomoyo_get_name(filename); |
323 | if (!e.filename) | |
b69a54ee | 324 | return -ENOMEM; |
36f5e1ff TH |
325 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
326 | &tomoyo_globally_readable_list, | |
327 | tomoyo_same_globally_readable); | |
9e4b50e9 | 328 | tomoyo_put_name(e.filename); |
b69a54ee KT |
329 | return error; |
330 | } | |
331 | ||
332 | /** | |
75093152 | 333 | * tomoyo_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. |
b69a54ee KT |
334 | * |
335 | * @filename: The filename to check. | |
336 | * | |
337 | * Returns true if any domain can open @filename for reading, false otherwise. | |
fdb8ebb7 TH |
338 | * |
339 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 340 | */ |
75093152 | 341 | static bool tomoyo_globally_readable_file(const struct tomoyo_path_info * |
b69a54ee KT |
342 | filename) |
343 | { | |
344 | struct tomoyo_globally_readable_file_entry *ptr; | |
345 | bool found = false; | |
fdb8ebb7 | 346 | |
82e0f001 TH |
347 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, |
348 | head.list) { | |
349 | if (!ptr->head.is_deleted && | |
b69a54ee KT |
350 | tomoyo_path_matches_pattern(filename, ptr->filename)) { |
351 | found = true; | |
352 | break; | |
353 | } | |
354 | } | |
b69a54ee KT |
355 | return found; |
356 | } | |
357 | ||
358 | /** | |
359 | * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. | |
360 | * | |
361 | * @data: String to parse. | |
362 | * @is_delete: True if it is a delete request. | |
363 | * | |
364 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
365 | * |
366 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
367 | */ |
368 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) | |
369 | { | |
370 | return tomoyo_update_globally_readable_entry(data, is_delete); | |
371 | } | |
372 | ||
373 | /** | |
374 | * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. | |
375 | * | |
376 | * @head: Pointer to "struct tomoyo_io_buffer". | |
377 | * | |
378 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
379 | * |
380 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
381 | */ |
382 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) | |
383 | { | |
384 | struct list_head *pos; | |
385 | bool done = true; | |
386 | ||
b69a54ee KT |
387 | list_for_each_cookie(pos, head->read_var2, |
388 | &tomoyo_globally_readable_list) { | |
389 | struct tomoyo_globally_readable_file_entry *ptr; | |
390 | ptr = list_entry(pos, | |
391 | struct tomoyo_globally_readable_file_entry, | |
82e0f001 TH |
392 | head.list); |
393 | if (ptr->head.is_deleted) | |
b69a54ee | 394 | continue; |
7d2948b1 TH |
395 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", |
396 | ptr->filename->name); | |
397 | if (!done) | |
b69a54ee | 398 | break; |
b69a54ee | 399 | } |
b69a54ee KT |
400 | return done; |
401 | } | |
402 | ||
c3fa109a TH |
403 | /* tomoyo_pattern_list is used for holding list of pathnames which are used for |
404 | * converting pathnames to pathname patterns during learning mode. | |
405 | * | |
406 | * An entry is added by | |
407 | * | |
408 | * # echo 'file_pattern /proc/\$/mounts' > \ | |
409 | * /sys/kernel/security/tomoyo/exception_policy | |
410 | * | |
411 | * and is deleted by | |
412 | * | |
413 | * # echo 'delete file_pattern /proc/\$/mounts' > \ | |
414 | * /sys/kernel/security/tomoyo/exception_policy | |
415 | * | |
416 | * and all entries are retrieved by | |
417 | * | |
418 | * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy | |
419 | * | |
420 | * In the example above, if a process which belongs to a domain which is in | |
421 | * learning mode requested open("/proc/1/mounts", O_RDONLY), | |
422 | * "allow_read /proc/\$/mounts" is automatically added to the domain which that | |
423 | * process belongs to. | |
424 | * | |
425 | * It is not a desirable behavior that we have to use /proc/\$/ instead of | |
426 | * /proc/self/ when current process needs to access only current process's | |
427 | * information. As of now, LSM version of TOMOYO is using __d_path() for | |
428 | * calculating pathname. Non LSM version of TOMOYO is using its own function | |
429 | * which pretends as if /proc/self/ is not a symlink; so that we can forbid | |
430 | * current process from accessing other process's information. | |
431 | */ | |
847b173e | 432 | LIST_HEAD(tomoyo_pattern_list); |
b69a54ee | 433 | |
36f5e1ff TH |
434 | static bool tomoyo_same_pattern(const struct tomoyo_acl_head *a, |
435 | const struct tomoyo_acl_head *b) | |
436 | { | |
437 | return container_of(a, struct tomoyo_pattern_entry, head)->pattern == | |
438 | container_of(b, struct tomoyo_pattern_entry, head)->pattern; | |
439 | } | |
440 | ||
b69a54ee KT |
441 | /** |
442 | * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. | |
443 | * | |
444 | * @pattern: Pathname pattern. | |
445 | * @is_delete: True if it is a delete request. | |
446 | * | |
447 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
448 | * |
449 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
450 | */ |
451 | static int tomoyo_update_file_pattern_entry(const char *pattern, | |
452 | const bool is_delete) | |
453 | { | |
3f629636 | 454 | struct tomoyo_pattern_entry e = { }; |
36f5e1ff | 455 | int error; |
b69a54ee | 456 | |
75093152 | 457 | if (!tomoyo_correct_word(pattern)) |
3f629636 TH |
458 | return -EINVAL; |
459 | e.pattern = tomoyo_get_name(pattern); | |
9e4b50e9 | 460 | if (!e.pattern) |
36f5e1ff TH |
461 | return -ENOMEM; |
462 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
463 | &tomoyo_pattern_list, | |
464 | tomoyo_same_pattern); | |
9e4b50e9 | 465 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
466 | return error; |
467 | } | |
468 | ||
469 | /** | |
17fcfbd9 | 470 | * tomoyo_file_pattern - Get patterned pathname. |
b69a54ee KT |
471 | * |
472 | * @filename: The filename to find patterned pathname. | |
473 | * | |
474 | * Returns pointer to pathname pattern if matched, @filename otherwise. | |
fdb8ebb7 TH |
475 | * |
476 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 477 | */ |
17fcfbd9 | 478 | const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename) |
b69a54ee KT |
479 | { |
480 | struct tomoyo_pattern_entry *ptr; | |
481 | const struct tomoyo_path_info *pattern = NULL; | |
482 | ||
82e0f001 TH |
483 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, head.list) { |
484 | if (ptr->head.is_deleted) | |
b69a54ee KT |
485 | continue; |
486 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
487 | continue; | |
488 | pattern = ptr->pattern; | |
489 | if (tomoyo_strendswith(pattern->name, "/\\*")) { | |
490 | /* Do nothing. Try to find the better match. */ | |
491 | } else { | |
492 | /* This would be the better match. Use this. */ | |
493 | break; | |
494 | } | |
495 | } | |
b69a54ee KT |
496 | if (pattern) |
497 | filename = pattern; | |
17fcfbd9 | 498 | return filename->name; |
b69a54ee KT |
499 | } |
500 | ||
501 | /** | |
502 | * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. | |
503 | * | |
504 | * @data: String to parse. | |
505 | * @is_delete: True if it is a delete request. | |
506 | * | |
507 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
508 | * |
509 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
510 | */ |
511 | int tomoyo_write_pattern_policy(char *data, const bool is_delete) | |
512 | { | |
513 | return tomoyo_update_file_pattern_entry(data, is_delete); | |
514 | } | |
515 | ||
516 | /** | |
517 | * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. | |
518 | * | |
519 | * @head: Pointer to "struct tomoyo_io_buffer". | |
520 | * | |
521 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
522 | * |
523 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
524 | */ |
525 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) | |
526 | { | |
527 | struct list_head *pos; | |
528 | bool done = true; | |
529 | ||
b69a54ee KT |
530 | list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { |
531 | struct tomoyo_pattern_entry *ptr; | |
82e0f001 TH |
532 | ptr = list_entry(pos, struct tomoyo_pattern_entry, head.list); |
533 | if (ptr->head.is_deleted) | |
b69a54ee | 534 | continue; |
7d2948b1 TH |
535 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN |
536 | "%s\n", ptr->pattern->name); | |
537 | if (!done) | |
b69a54ee | 538 | break; |
b69a54ee | 539 | } |
b69a54ee KT |
540 | return done; |
541 | } | |
542 | ||
c3fa109a TH |
543 | /* |
544 | * tomoyo_no_rewrite_list is used for holding list of pathnames which are by | |
545 | * default forbidden to modify already written content of a file. | |
546 | * | |
547 | * An entry is added by | |
548 | * | |
549 | * # echo 'deny_rewrite /var/log/messages' > \ | |
550 | * /sys/kernel/security/tomoyo/exception_policy | |
551 | * | |
552 | * and is deleted by | |
553 | * | |
554 | * # echo 'delete deny_rewrite /var/log/messages' > \ | |
555 | * /sys/kernel/security/tomoyo/exception_policy | |
556 | * | |
557 | * and all entries are retrieved by | |
558 | * | |
559 | * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy | |
560 | * | |
561 | * In the example above, if a process requested to rewrite /var/log/messages , | |
562 | * the process can't rewrite unless the domain which that process belongs to | |
563 | * has "allow_rewrite /var/log/messages" entry. | |
564 | * | |
565 | * It is not a desirable behavior that we have to add "\040(deleted)" suffix | |
566 | * when we want to allow rewriting already unlink()ed file. As of now, | |
567 | * LSM version of TOMOYO is using __d_path() for calculating pathname. | |
568 | * Non LSM version of TOMOYO is using its own function which doesn't append | |
569 | * " (deleted)" suffix if the file is already unlink()ed; so that we don't | |
570 | * need to worry whether the file is already unlink()ed or not. | |
571 | */ | |
847b173e | 572 | LIST_HEAD(tomoyo_no_rewrite_list); |
b69a54ee | 573 | |
36f5e1ff TH |
574 | static bool tomoyo_same_no_rewrite(const struct tomoyo_acl_head *a, |
575 | const struct tomoyo_acl_head *b) | |
576 | { | |
577 | return container_of(a, struct tomoyo_no_rewrite_entry, head)->pattern | |
578 | == container_of(b, struct tomoyo_no_rewrite_entry, head) | |
579 | ->pattern; | |
580 | } | |
581 | ||
b69a54ee KT |
582 | /** |
583 | * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. | |
584 | * | |
585 | * @pattern: Pathname pattern that are not rewritable by default. | |
586 | * @is_delete: True if it is a delete request. | |
587 | * | |
588 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
589 | * |
590 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
591 | */ |
592 | static int tomoyo_update_no_rewrite_entry(const char *pattern, | |
593 | const bool is_delete) | |
594 | { | |
9e4b50e9 | 595 | struct tomoyo_no_rewrite_entry e = { }; |
36f5e1ff | 596 | int error; |
b69a54ee | 597 | |
75093152 | 598 | if (!tomoyo_correct_word(pattern)) |
b69a54ee | 599 | return -EINVAL; |
9e4b50e9 TH |
600 | e.pattern = tomoyo_get_name(pattern); |
601 | if (!e.pattern) | |
36f5e1ff TH |
602 | return -ENOMEM; |
603 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
604 | &tomoyo_no_rewrite_list, | |
605 | tomoyo_same_no_rewrite); | |
9e4b50e9 | 606 | tomoyo_put_name(e.pattern); |
b69a54ee KT |
607 | return error; |
608 | } | |
609 | ||
610 | /** | |
75093152 | 611 | * tomoyo_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. |
b69a54ee KT |
612 | * |
613 | * @filename: Filename to check. | |
614 | * | |
615 | * Returns true if @filename is specified by "deny_rewrite" directive, | |
616 | * false otherwise. | |
fdb8ebb7 TH |
617 | * |
618 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 619 | */ |
75093152 | 620 | static bool tomoyo_no_rewrite_file(const struct tomoyo_path_info *filename) |
b69a54ee KT |
621 | { |
622 | struct tomoyo_no_rewrite_entry *ptr; | |
623 | bool found = false; | |
624 | ||
82e0f001 TH |
625 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, head.list) { |
626 | if (ptr->head.is_deleted) | |
b69a54ee KT |
627 | continue; |
628 | if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) | |
629 | continue; | |
630 | found = true; | |
631 | break; | |
632 | } | |
b69a54ee KT |
633 | return found; |
634 | } | |
635 | ||
636 | /** | |
637 | * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. | |
638 | * | |
639 | * @data: String to parse. | |
640 | * @is_delete: True if it is a delete request. | |
641 | * | |
642 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
643 | * |
644 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
645 | */ |
646 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) | |
647 | { | |
648 | return tomoyo_update_no_rewrite_entry(data, is_delete); | |
649 | } | |
650 | ||
651 | /** | |
652 | * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. | |
653 | * | |
654 | * @head: Pointer to "struct tomoyo_io_buffer". | |
655 | * | |
656 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
657 | * |
658 | * Caller holds tomoyo_read_lock(). | |
b69a54ee KT |
659 | */ |
660 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) | |
661 | { | |
662 | struct list_head *pos; | |
663 | bool done = true; | |
664 | ||
b69a54ee KT |
665 | list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { |
666 | struct tomoyo_no_rewrite_entry *ptr; | |
82e0f001 TH |
667 | ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, |
668 | head.list); | |
669 | if (ptr->head.is_deleted) | |
b69a54ee | 670 | continue; |
7d2948b1 TH |
671 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE |
672 | "%s\n", ptr->pattern->name); | |
673 | if (!done) | |
b69a54ee | 674 | break; |
b69a54ee | 675 | } |
b69a54ee KT |
676 | return done; |
677 | } | |
678 | ||
99a85259 TH |
679 | static bool tomoyo_check_path_acl(const struct tomoyo_request_info *r, |
680 | const struct tomoyo_acl_info *ptr) | |
b69a54ee | 681 | { |
99a85259 TH |
682 | const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl), |
683 | head); | |
684 | return (acl->perm & (1 << r->param.path.operation)) && | |
685 | tomoyo_compare_name_union(r->param.path.filename, &acl->name); | |
686 | } | |
b69a54ee | 687 | |
99a85259 TH |
688 | static bool tomoyo_check_path_number_acl(const struct tomoyo_request_info *r, |
689 | const struct tomoyo_acl_info *ptr) | |
690 | { | |
691 | const struct tomoyo_path_number_acl *acl = | |
692 | container_of(ptr, typeof(*acl), head); | |
693 | return (acl->perm & (1 << r->param.path_number.operation)) && | |
694 | tomoyo_compare_number_union(r->param.path_number.number, | |
695 | &acl->number) && | |
696 | tomoyo_compare_name_union(r->param.path_number.filename, | |
697 | &acl->name); | |
698 | } | |
699 | ||
700 | static bool tomoyo_check_path2_acl(const struct tomoyo_request_info *r, | |
701 | const struct tomoyo_acl_info *ptr) | |
702 | { | |
703 | const struct tomoyo_path2_acl *acl = | |
704 | container_of(ptr, typeof(*acl), head); | |
705 | return (acl->perm & (1 << r->param.path2.operation)) && | |
706 | tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1) | |
707 | && tomoyo_compare_name_union(r->param.path2.filename2, | |
708 | &acl->name2); | |
709 | } | |
710 | ||
711 | static bool tomoyo_check_mkdev_acl(const struct tomoyo_request_info *r, | |
712 | const struct tomoyo_acl_info *ptr) | |
713 | { | |
75093152 | 714 | const struct tomoyo_mkdev_acl *acl = |
99a85259 TH |
715 | container_of(ptr, typeof(*acl), head); |
716 | return (acl->perm & (1 << r->param.mkdev.operation)) && | |
717 | tomoyo_compare_number_union(r->param.mkdev.mode, | |
718 | &acl->mode) && | |
719 | tomoyo_compare_number_union(r->param.mkdev.major, | |
720 | &acl->major) && | |
721 | tomoyo_compare_number_union(r->param.mkdev.minor, | |
722 | &acl->minor) && | |
723 | tomoyo_compare_name_union(r->param.mkdev.filename, | |
724 | &acl->name); | |
b69a54ee KT |
725 | } |
726 | ||
237ab459 TH |
727 | static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, |
728 | const struct tomoyo_acl_info *b) | |
729 | { | |
730 | const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); | |
731 | const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
732 | return tomoyo_same_acl_head(&p1->head, &p2->head) && |
733 | tomoyo_same_name_union(&p1->name, &p2->name); | |
237ab459 TH |
734 | } |
735 | ||
736 | static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, | |
737 | struct tomoyo_acl_info *b, | |
738 | const bool is_delete) | |
739 | { | |
740 | u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head) | |
741 | ->perm; | |
742 | u16 perm = *a_perm; | |
743 | const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; | |
744 | if (is_delete) { | |
745 | perm &= ~b_perm; | |
746 | if ((perm & TOMOYO_RW_MASK) != TOMOYO_RW_MASK) | |
747 | perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); | |
748 | else if (!(perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
749 | perm &= ~TOMOYO_RW_MASK; | |
750 | } else { | |
751 | perm |= b_perm; | |
752 | if ((perm & TOMOYO_RW_MASK) == TOMOYO_RW_MASK) | |
753 | perm |= (1 << TOMOYO_TYPE_READ_WRITE); | |
754 | else if (perm & (1 << TOMOYO_TYPE_READ_WRITE)) | |
755 | perm |= TOMOYO_RW_MASK; | |
756 | } | |
757 | *a_perm = perm; | |
758 | return !perm; | |
759 | } | |
760 | ||
b69a54ee | 761 | /** |
7ef61233 | 762 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
763 | * |
764 | * @type: Type of operation. | |
765 | * @filename: Filename. | |
766 | * @domain: Pointer to "struct tomoyo_domain_info". | |
767 | * @is_delete: True if it is a delete request. | |
768 | * | |
769 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
770 | * |
771 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 772 | */ |
7ef61233 | 773 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
237ab459 | 774 | struct tomoyo_domain_info * const domain, |
7ef61233 | 775 | const bool is_delete) |
b69a54ee | 776 | { |
9e4b50e9 TH |
777 | struct tomoyo_path_acl e = { |
778 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
237ab459 | 779 | .perm = 1 << type |
9e4b50e9 | 780 | }; |
237ab459 TH |
781 | int error; |
782 | if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE)) | |
783 | e.perm |= TOMOYO_RW_MASK; | |
7762fbff | 784 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 785 | return -EINVAL; |
237ab459 TH |
786 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
787 | tomoyo_same_path_acl, | |
788 | tomoyo_merge_path_acl); | |
7762fbff | 789 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
790 | return error; |
791 | } | |
792 | ||
75093152 | 793 | static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a, |
237ab459 TH |
794 | const struct tomoyo_acl_info *b) |
795 | { | |
75093152 | 796 | const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), |
237ab459 | 797 | head); |
75093152 | 798 | const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), |
237ab459 | 799 | head); |
75093152 TH |
800 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
801 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
802 | && tomoyo_same_number_union(&p1->mode, &p2->mode) | |
803 | && tomoyo_same_number_union(&p1->major, &p2->major) | |
804 | && tomoyo_same_number_union(&p1->minor, &p2->minor); | |
237ab459 TH |
805 | } |
806 | ||
75093152 | 807 | static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, |
237ab459 TH |
808 | struct tomoyo_acl_info *b, |
809 | const bool is_delete) | |
810 | { | |
75093152 | 811 | u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl, |
237ab459 TH |
812 | head)->perm; |
813 | u8 perm = *a_perm; | |
75093152 | 814 | const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head) |
237ab459 TH |
815 | ->perm; |
816 | if (is_delete) | |
817 | perm &= ~b_perm; | |
818 | else | |
819 | perm |= b_perm; | |
820 | *a_perm = perm; | |
821 | return !perm; | |
822 | } | |
823 | ||
a1f9bb6a | 824 | /** |
75093152 | 825 | * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list. |
a1f9bb6a TH |
826 | * |
827 | * @type: Type of operation. | |
828 | * @filename: Filename. | |
829 | * @mode: Create mode. | |
830 | * @major: Device major number. | |
831 | * @minor: Device minor number. | |
832 | * @domain: Pointer to "struct tomoyo_domain_info". | |
833 | * @is_delete: True if it is a delete request. | |
834 | * | |
835 | * Returns 0 on success, negative value otherwise. | |
237ab459 TH |
836 | * |
837 | * Caller holds tomoyo_read_lock(). | |
a1f9bb6a | 838 | */ |
75093152 | 839 | static int tomoyo_update_mkdev_acl(const u8 type, const char *filename, |
237ab459 TH |
840 | char *mode, char *major, char *minor, |
841 | struct tomoyo_domain_info * const | |
842 | domain, const bool is_delete) | |
a1f9bb6a | 843 | { |
75093152 TH |
844 | struct tomoyo_mkdev_acl e = { |
845 | .head.type = TOMOYO_TYPE_MKDEV_ACL, | |
237ab459 | 846 | .perm = 1 << type |
a1f9bb6a TH |
847 | }; |
848 | int error = is_delete ? -ENOENT : -ENOMEM; | |
849 | if (!tomoyo_parse_name_union(filename, &e.name) || | |
850 | !tomoyo_parse_number_union(mode, &e.mode) || | |
851 | !tomoyo_parse_number_union(major, &e.major) || | |
852 | !tomoyo_parse_number_union(minor, &e.minor)) | |
853 | goto out; | |
237ab459 | 854 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
75093152 TH |
855 | tomoyo_same_mkdev_acl, |
856 | tomoyo_merge_mkdev_acl); | |
a1f9bb6a TH |
857 | out: |
858 | tomoyo_put_name_union(&e.name); | |
859 | tomoyo_put_number_union(&e.mode); | |
860 | tomoyo_put_number_union(&e.major); | |
861 | tomoyo_put_number_union(&e.minor); | |
862 | return error; | |
863 | } | |
864 | ||
237ab459 TH |
865 | static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, |
866 | const struct tomoyo_acl_info *b) | |
867 | { | |
868 | const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); | |
869 | const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
870 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
871 | && tomoyo_same_name_union(&p1->name1, &p2->name1) | |
872 | && tomoyo_same_name_union(&p1->name2, &p2->name2); | |
237ab459 TH |
873 | } |
874 | ||
875 | static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a, | |
876 | struct tomoyo_acl_info *b, | |
877 | const bool is_delete) | |
878 | { | |
879 | u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head) | |
880 | ->perm; | |
881 | u8 perm = *a_perm; | |
882 | const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm; | |
883 | if (is_delete) | |
884 | perm &= ~b_perm; | |
885 | else | |
886 | perm |= b_perm; | |
887 | *a_perm = perm; | |
888 | return !perm; | |
889 | } | |
890 | ||
b69a54ee | 891 | /** |
7ef61233 | 892 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
893 | * |
894 | * @type: Type of operation. | |
895 | * @filename1: First filename. | |
896 | * @filename2: Second filename. | |
897 | * @domain: Pointer to "struct tomoyo_domain_info". | |
898 | * @is_delete: True if it is a delete request. | |
899 | * | |
900 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
901 | * |
902 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 903 | */ |
7ef61233 TH |
904 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
905 | const char *filename2, | |
237ab459 | 906 | struct tomoyo_domain_info * const domain, |
7ef61233 | 907 | const bool is_delete) |
b69a54ee | 908 | { |
9e4b50e9 TH |
909 | struct tomoyo_path2_acl e = { |
910 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
237ab459 | 911 | .perm = 1 << type |
9e4b50e9 | 912 | }; |
ca0b7df3 | 913 | int error = is_delete ? -ENOENT : -ENOMEM; |
7762fbff TH |
914 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
915 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 916 | goto out; |
237ab459 TH |
917 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
918 | tomoyo_same_path2_acl, | |
919 | tomoyo_merge_path2_acl); | |
ca0b7df3 | 920 | out: |
7762fbff TH |
921 | tomoyo_put_name_union(&e.name1); |
922 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
923 | return error; |
924 | } | |
925 | ||
b69a54ee | 926 | /** |
cb0abe6a | 927 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 928 | * |
cb0abe6a | 929 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
930 | * @operation: Type of operation. |
931 | * @filename: Filename to check. | |
b69a54ee KT |
932 | * |
933 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
934 | * |
935 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 936 | */ |
05336dee TH |
937 | int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
938 | const struct tomoyo_path_info *filename) | |
b69a54ee | 939 | { |
b69a54ee | 940 | int error; |
b69a54ee | 941 | |
b69a54ee | 942 | next: |
57c2590f TH |
943 | r->type = tomoyo_p2mac[operation]; |
944 | r->mode = tomoyo_get_mode(r->profile, r->type); | |
945 | if (r->mode == TOMOYO_CONFIG_DISABLED) | |
946 | return 0; | |
cf6e9a64 TH |
947 | r->param_type = TOMOYO_TYPE_PATH_ACL; |
948 | r->param.path.filename = filename; | |
949 | r->param.path.operation = operation; | |
17fcfbd9 | 950 | do { |
99a85259 TH |
951 | tomoyo_check_acl(r, tomoyo_check_path_acl); |
952 | if (!r->granted && operation == TOMOYO_TYPE_READ && | |
05336dee | 953 | !r->domain->ignore_global_allow_read && |
75093152 | 954 | tomoyo_globally_readable_file(filename)) |
99a85259 TH |
955 | r->granted = true; |
956 | error = tomoyo_audit_path_log(r); | |
05336dee TH |
957 | /* |
958 | * Do not retry for execute request, for alias may have | |
959 | * changed. | |
960 | */ | |
961 | } while (error == TOMOYO_RETRY_REQUEST && | |
962 | operation != TOMOYO_TYPE_EXECUTE); | |
b69a54ee KT |
963 | /* |
964 | * Since "allow_truncate" doesn't imply "allow_rewrite" permission, | |
965 | * we need to check "allow_rewrite" permission if the filename is | |
966 | * specified by "deny_rewrite" keyword. | |
967 | */ | |
7ef61233 | 968 | if (!error && operation == TOMOYO_TYPE_TRUNCATE && |
75093152 | 969 | tomoyo_no_rewrite_file(filename)) { |
7ef61233 | 970 | operation = TOMOYO_TYPE_REWRITE; |
b69a54ee KT |
971 | goto next; |
972 | } | |
973 | return error; | |
974 | } | |
975 | ||
237ab459 TH |
976 | static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, |
977 | const struct tomoyo_acl_info *b) | |
978 | { | |
979 | const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1), | |
980 | head); | |
981 | const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), | |
982 | head); | |
75093152 TH |
983 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
984 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
985 | && tomoyo_same_number_union(&p1->number, &p2->number); | |
237ab459 TH |
986 | } |
987 | ||
988 | static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, | |
989 | struct tomoyo_acl_info *b, | |
990 | const bool is_delete) | |
991 | { | |
992 | u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl, | |
993 | head)->perm; | |
994 | u8 perm = *a_perm; | |
995 | const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head) | |
996 | ->perm; | |
997 | if (is_delete) | |
998 | perm &= ~b_perm; | |
999 | else | |
1000 | perm |= b_perm; | |
1001 | *a_perm = perm; | |
1002 | return !perm; | |
1003 | } | |
1004 | ||
a1f9bb6a TH |
1005 | /** |
1006 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. | |
1007 | * | |
1008 | * @type: Type of operation. | |
1009 | * @filename: Filename. | |
1010 | * @number: Number. | |
1011 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1012 | * @is_delete: True if it is a delete request. | |
1013 | * | |
1014 | * Returns 0 on success, negative value otherwise. | |
1015 | */ | |
237ab459 TH |
1016 | static int tomoyo_update_path_number_acl(const u8 type, const char *filename, |
1017 | char *number, | |
1018 | struct tomoyo_domain_info * const | |
1019 | domain, | |
1020 | const bool is_delete) | |
a1f9bb6a | 1021 | { |
a1f9bb6a TH |
1022 | struct tomoyo_path_number_acl e = { |
1023 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
237ab459 | 1024 | .perm = 1 << type |
a1f9bb6a TH |
1025 | }; |
1026 | int error = is_delete ? -ENOENT : -ENOMEM; | |
a1f9bb6a TH |
1027 | if (!tomoyo_parse_name_union(filename, &e.name)) |
1028 | return -EINVAL; | |
1029 | if (!tomoyo_parse_number_union(number, &e.number)) | |
1030 | goto out; | |
237ab459 TH |
1031 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
1032 | tomoyo_same_path_number_acl, | |
1033 | tomoyo_merge_path_number_acl); | |
a1f9bb6a TH |
1034 | out: |
1035 | tomoyo_put_name_union(&e.name); | |
1036 | tomoyo_put_number_union(&e.number); | |
1037 | return error; | |
1038 | } | |
1039 | ||
a1f9bb6a TH |
1040 | /** |
1041 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
1042 | * | |
1043 | * @type: Type of operation. | |
1044 | * @path: Pointer to "struct path". | |
1045 | * @number: Number. | |
1046 | * | |
1047 | * Returns 0 on success, negative value otherwise. | |
1048 | */ | |
1049 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
1050 | unsigned long number) | |
1051 | { | |
1052 | struct tomoyo_request_info r; | |
1053 | int error = -ENOMEM; | |
c8c57e84 | 1054 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1055 | int idx; |
1056 | ||
57c2590f TH |
1057 | if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
1058 | == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) | |
a1f9bb6a TH |
1059 | return 0; |
1060 | idx = tomoyo_read_lock(); | |
c8c57e84 | 1061 | if (!tomoyo_get_realpath(&buf, path)) |
a1f9bb6a | 1062 | goto out; |
c8c57e84 TH |
1063 | if (type == TOMOYO_TYPE_MKDIR) |
1064 | tomoyo_add_slash(&buf); | |
cb917cf5 TH |
1065 | r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL; |
1066 | r.param.path_number.operation = type; | |
1067 | r.param.path_number.filename = &buf; | |
1068 | r.param.path_number.number = number; | |
1069 | do { | |
1070 | tomoyo_check_acl(&r, tomoyo_check_path_number_acl); | |
1071 | error = tomoyo_audit_path_number_log(&r); | |
1072 | } while (error == TOMOYO_RETRY_REQUEST); | |
c8c57e84 | 1073 | kfree(buf.name); |
cb917cf5 | 1074 | out: |
a1f9bb6a TH |
1075 | tomoyo_read_unlock(idx); |
1076 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1077 | error = 0; | |
1078 | return error; | |
1079 | } | |
1080 | ||
b69a54ee KT |
1081 | /** |
1082 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
1083 | * | |
1084 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1085 | * @path: Pointer to "struct path". | |
1086 | * @flag: Flags for open(). | |
1087 | * | |
1088 | * Returns 0 on success, negative value otherwise. | |
1089 | */ | |
1090 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
1091 | struct path *path, const int flag) | |
1092 | { | |
1093 | const u8 acc_mode = ACC_MODE(flag); | |
1094 | int error = -ENOMEM; | |
c8c57e84 | 1095 | struct tomoyo_path_info buf; |
cb0abe6a | 1096 | struct tomoyo_request_info r; |
fdb8ebb7 | 1097 | int idx; |
b69a54ee | 1098 | |
57c2590f TH |
1099 | if (!path->mnt || |
1100 | (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))) | |
b69a54ee | 1101 | return 0; |
57c2590f TH |
1102 | buf.name = NULL; |
1103 | r.mode = TOMOYO_CONFIG_DISABLED; | |
fdb8ebb7 | 1104 | idx = tomoyo_read_lock(); |
c8c57e84 | 1105 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1106 | goto out; |
1107 | error = 0; | |
1108 | /* | |
1109 | * If the filename is specified by "deny_rewrite" keyword, | |
1110 | * we need to check "allow_rewrite" permission when the filename is not | |
1111 | * opened for append mode or the filename is truncated at open time. | |
1112 | */ | |
57c2590f TH |
1113 | if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND) |
1114 | && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE) | |
1115 | != TOMOYO_CONFIG_DISABLED) { | |
1116 | if (!tomoyo_get_realpath(&buf, path)) { | |
1117 | error = -ENOMEM; | |
1118 | goto out; | |
1119 | } | |
75093152 | 1120 | if (tomoyo_no_rewrite_file(&buf)) |
57c2590f TH |
1121 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, |
1122 | &buf); | |
b69a54ee | 1123 | } |
57c2590f TH |
1124 | if (!error && acc_mode && |
1125 | tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) | |
1126 | != TOMOYO_CONFIG_DISABLED) { | |
05336dee | 1127 | u8 operation; |
57c2590f TH |
1128 | if (!buf.name && !tomoyo_get_realpath(&buf, path)) { |
1129 | error = -ENOMEM; | |
1130 | goto out; | |
1131 | } | |
05336dee TH |
1132 | if (acc_mode == (MAY_READ | MAY_WRITE)) |
1133 | operation = TOMOYO_TYPE_READ_WRITE; | |
1134 | else if (acc_mode == MAY_READ) | |
1135 | operation = TOMOYO_TYPE_READ; | |
1136 | else | |
1137 | operation = TOMOYO_TYPE_WRITE; | |
1138 | error = tomoyo_path_permission(&r, operation, &buf); | |
57c2590f | 1139 | } |
b69a54ee | 1140 | out: |
c8c57e84 | 1141 | kfree(buf.name); |
fdb8ebb7 | 1142 | tomoyo_read_unlock(idx); |
cb0abe6a | 1143 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1144 | error = 0; |
1145 | return error; | |
1146 | } | |
1147 | ||
1148 | /** | |
2106ccd9 | 1149 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount". |
b69a54ee | 1150 | * |
b69a54ee KT |
1151 | * @operation: Type of operation. |
1152 | * @path: Pointer to "struct path". | |
1153 | * | |
1154 | * Returns 0 on success, negative value otherwise. | |
1155 | */ | |
97d6931e | 1156 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee KT |
1157 | { |
1158 | int error = -ENOMEM; | |
c8c57e84 | 1159 | struct tomoyo_path_info buf; |
cb0abe6a | 1160 | struct tomoyo_request_info r; |
fdb8ebb7 | 1161 | int idx; |
b69a54ee | 1162 | |
57c2590f TH |
1163 | if (!path->mnt) |
1164 | return 0; | |
1165 | if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) | |
1166 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1167 | return 0; |
57c2590f | 1168 | buf.name = NULL; |
fdb8ebb7 | 1169 | idx = tomoyo_read_lock(); |
c8c57e84 | 1170 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
1171 | goto out; |
1172 | switch (operation) { | |
cb0abe6a | 1173 | case TOMOYO_TYPE_REWRITE: |
75093152 | 1174 | if (!tomoyo_no_rewrite_file(&buf)) { |
cb0abe6a TH |
1175 | error = 0; |
1176 | goto out; | |
1177 | } | |
1178 | break; | |
7ef61233 TH |
1179 | case TOMOYO_TYPE_RMDIR: |
1180 | case TOMOYO_TYPE_CHROOT: | |
57c2590f | 1181 | case TOMOYO_TYPE_UMOUNT: |
c8c57e84 TH |
1182 | tomoyo_add_slash(&buf); |
1183 | break; | |
b69a54ee | 1184 | } |
c8c57e84 | 1185 | error = tomoyo_path_permission(&r, operation, &buf); |
b69a54ee | 1186 | out: |
c8c57e84 | 1187 | kfree(buf.name); |
fdb8ebb7 | 1188 | tomoyo_read_unlock(idx); |
cb0abe6a | 1189 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1190 | error = 0; |
1191 | return error; | |
1192 | } | |
1193 | ||
a1f9bb6a | 1194 | /** |
75093152 | 1195 | * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar". |
a1f9bb6a TH |
1196 | * |
1197 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
1198 | * @path: Pointer to "struct path". | |
1199 | * @mode: Create mode. | |
1200 | * @dev: Device number. | |
1201 | * | |
1202 | * Returns 0 on success, negative value otherwise. | |
1203 | */ | |
75093152 | 1204 | int tomoyo_mkdev_perm(const u8 operation, struct path *path, |
a1f9bb6a TH |
1205 | const unsigned int mode, unsigned int dev) |
1206 | { | |
1207 | struct tomoyo_request_info r; | |
1208 | int error = -ENOMEM; | |
c8c57e84 | 1209 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
1210 | int idx; |
1211 | ||
57c2590f TH |
1212 | if (!path->mnt || |
1213 | tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) | |
1214 | == TOMOYO_CONFIG_DISABLED) | |
a1f9bb6a TH |
1215 | return 0; |
1216 | idx = tomoyo_read_lock(); | |
1217 | error = -ENOMEM; | |
c8c57e84 | 1218 | if (tomoyo_get_realpath(&buf, path)) { |
cf6e9a64 | 1219 | dev = new_decode_dev(dev); |
75093152 | 1220 | r.param_type = TOMOYO_TYPE_MKDEV_ACL; |
cf6e9a64 TH |
1221 | r.param.mkdev.filename = &buf; |
1222 | r.param.mkdev.operation = operation; | |
1223 | r.param.mkdev.mode = mode; | |
1224 | r.param.mkdev.major = MAJOR(dev); | |
1225 | r.param.mkdev.minor = MINOR(dev); | |
99a85259 TH |
1226 | tomoyo_check_acl(&r, tomoyo_check_mkdev_acl); |
1227 | error = tomoyo_audit_mkdev_log(&r); | |
c8c57e84 | 1228 | kfree(buf.name); |
a1f9bb6a TH |
1229 | } |
1230 | tomoyo_read_unlock(idx); | |
1231 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
1232 | error = 0; | |
1233 | return error; | |
1234 | } | |
1235 | ||
b69a54ee | 1236 | /** |
7ef61233 | 1237 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 1238 | * |
b69a54ee KT |
1239 | * @operation: Type of operation. |
1240 | * @path1: Pointer to "struct path". | |
1241 | * @path2: Pointer to "struct path". | |
1242 | * | |
1243 | * Returns 0 on success, negative value otherwise. | |
1244 | */ | |
97d6931e | 1245 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 1246 | struct path *path2) |
b69a54ee KT |
1247 | { |
1248 | int error = -ENOMEM; | |
c8c57e84 TH |
1249 | struct tomoyo_path_info buf1; |
1250 | struct tomoyo_path_info buf2; | |
cb0abe6a | 1251 | struct tomoyo_request_info r; |
fdb8ebb7 | 1252 | int idx; |
b69a54ee | 1253 | |
57c2590f TH |
1254 | if (!path1->mnt || !path2->mnt || |
1255 | tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) | |
1256 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 1257 | return 0; |
c8c57e84 TH |
1258 | buf1.name = NULL; |
1259 | buf2.name = NULL; | |
fdb8ebb7 | 1260 | idx = tomoyo_read_lock(); |
c8c57e84 TH |
1261 | if (!tomoyo_get_realpath(&buf1, path1) || |
1262 | !tomoyo_get_realpath(&buf2, path2)) | |
b69a54ee | 1263 | goto out; |
57c2590f TH |
1264 | switch (operation) { |
1265 | struct dentry *dentry; | |
1266 | case TOMOYO_TYPE_RENAME: | |
1267 | case TOMOYO_TYPE_LINK: | |
1268 | dentry = path1->dentry; | |
1269 | if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) | |
1270 | break; | |
1271 | /* fall through */ | |
1272 | case TOMOYO_TYPE_PIVOT_ROOT: | |
1273 | tomoyo_add_slash(&buf1); | |
1274 | tomoyo_add_slash(&buf2); | |
1275 | break; | |
1276 | } | |
cf6e9a64 TH |
1277 | r.param_type = TOMOYO_TYPE_PATH2_ACL; |
1278 | r.param.path2.operation = operation; | |
1279 | r.param.path2.filename1 = &buf1; | |
1280 | r.param.path2.filename2 = &buf2; | |
17fcfbd9 | 1281 | do { |
99a85259 TH |
1282 | tomoyo_check_acl(&r, tomoyo_check_path2_acl); |
1283 | error = tomoyo_audit_path2_log(&r); | |
1284 | } while (error == TOMOYO_RETRY_REQUEST); | |
b69a54ee | 1285 | out: |
c8c57e84 TH |
1286 | kfree(buf1.name); |
1287 | kfree(buf2.name); | |
fdb8ebb7 | 1288 | tomoyo_read_unlock(idx); |
cb0abe6a | 1289 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
1290 | error = 0; |
1291 | return error; | |
1292 | } | |
a1f9bb6a TH |
1293 | |
1294 | /** | |
1295 | * tomoyo_write_file_policy - Update file related list. | |
1296 | * | |
1297 | * @data: String to parse. | |
1298 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1299 | * @is_delete: True if it is a delete request. | |
1300 | * | |
1301 | * Returns 0 on success, negative value otherwise. | |
1302 | * | |
1303 | * Caller holds tomoyo_read_lock(). | |
1304 | */ | |
1305 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
1306 | const bool is_delete) | |
1307 | { | |
1308 | char *w[5]; | |
1309 | u8 type; | |
1310 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
1311 | return -EINVAL; | |
237ab459 | 1312 | if (strncmp(w[0], "allow_", 6)) |
a1f9bb6a | 1313 | goto out; |
a1f9bb6a TH |
1314 | w[0] += 6; |
1315 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
1316 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
1317 | continue; | |
1318 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
1319 | } | |
1320 | if (!w[2][0]) | |
1321 | goto out; | |
1322 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
1323 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
1324 | continue; | |
1325 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
1326 | is_delete); | |
1327 | } | |
1328 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
1329 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
1330 | continue; | |
1331 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
1332 | is_delete); | |
1333 | } | |
1334 | if (!w[3][0] || !w[4][0]) | |
1335 | goto out; | |
75093152 TH |
1336 | for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) { |
1337 | if (strcmp(w[0], tomoyo_mkdev_keyword[type])) | |
a1f9bb6a | 1338 | continue; |
75093152 TH |
1339 | return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3], |
1340 | w[4], domain, is_delete); | |
a1f9bb6a TH |
1341 | } |
1342 | out: | |
1343 | return -EINVAL; | |
1344 | } |