Commit | Line | Data |
---|---|---|
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_EXECUTE] = "execute", |
15 | [TOMOYO_TYPE_READ] = "read", | |
16 | [TOMOYO_TYPE_WRITE] = "write", | |
7c75964f | 17 | [TOMOYO_TYPE_APPEND] = "append", |
7ef61233 | 18 | [TOMOYO_TYPE_UNLINK] = "unlink", |
7c75964f | 19 | [TOMOYO_TYPE_GETATTR] = "getattr", |
7ef61233 | 20 | [TOMOYO_TYPE_RMDIR] = "rmdir", |
7ef61233 TH |
21 | [TOMOYO_TYPE_TRUNCATE] = "truncate", |
22 | [TOMOYO_TYPE_SYMLINK] = "symlink", | |
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 | 52 | static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = { |
57c2590f TH |
53 | [TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE, |
54 | [TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN, | |
55 | [TOMOYO_TYPE_WRITE] = TOMOYO_MAC_FILE_OPEN, | |
7c75964f | 56 | [TOMOYO_TYPE_APPEND] = TOMOYO_MAC_FILE_OPEN, |
57c2590f | 57 | [TOMOYO_TYPE_UNLINK] = TOMOYO_MAC_FILE_UNLINK, |
7c75964f | 58 | [TOMOYO_TYPE_GETATTR] = TOMOYO_MAC_FILE_GETATTR, |
57c2590f TH |
59 | [TOMOYO_TYPE_RMDIR] = TOMOYO_MAC_FILE_RMDIR, |
60 | [TOMOYO_TYPE_TRUNCATE] = TOMOYO_MAC_FILE_TRUNCATE, | |
61 | [TOMOYO_TYPE_SYMLINK] = TOMOYO_MAC_FILE_SYMLINK, | |
57c2590f TH |
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 | ||
484ca79c TH |
98 | const struct tomoyo_path_info * |
99 | tomoyo_compare_name_union(const struct tomoyo_path_info *name, | |
100 | const struct tomoyo_name_union *ptr) | |
7762fbff TH |
101 | { |
102 | if (ptr->is_group) | |
3f629636 | 103 | return tomoyo_path_matches_group(name, ptr->group); |
484ca79c TH |
104 | if (tomoyo_path_matches_pattern(name, ptr->filename)) |
105 | return ptr->filename; | |
106 | return NULL; | |
7762fbff TH |
107 | } |
108 | ||
4c3e9e2d TH |
109 | void tomoyo_put_number_union(struct tomoyo_number_union *ptr) |
110 | { | |
111 | if (ptr && ptr->is_group) | |
a98aa4de | 112 | tomoyo_put_group(ptr->group); |
4c3e9e2d TH |
113 | } |
114 | ||
115 | bool tomoyo_compare_number_union(const unsigned long value, | |
116 | const struct tomoyo_number_union *ptr) | |
117 | { | |
118 | if (ptr->is_group) | |
119 | return tomoyo_number_matches_group(value, value, ptr->group); | |
120 | return value >= ptr->values[0] && value <= ptr->values[1]; | |
121 | } | |
122 | ||
c8c57e84 TH |
123 | static void tomoyo_add_slash(struct tomoyo_path_info *buf) |
124 | { | |
125 | if (buf->is_dir) | |
126 | return; | |
127 | /* | |
128 | * This is OK because tomoyo_encode() reserves space for appending "/". | |
129 | */ | |
130 | strcat((char *) buf->name, "/"); | |
131 | tomoyo_fill_path_info(buf); | |
132 | } | |
133 | ||
b69a54ee | 134 | /** |
c8c57e84 | 135 | * tomoyo_get_realpath - Get realpath. |
b69a54ee | 136 | * |
c8c57e84 | 137 | * @buf: Pointer to "struct tomoyo_path_info". |
b69a54ee KT |
138 | * @path: Pointer to "struct path". |
139 | * | |
c8c57e84 | 140 | * Returns true on success, false otherwise. |
b69a54ee | 141 | */ |
c8c57e84 | 142 | static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path) |
b69a54ee | 143 | { |
c8c57e84 TH |
144 | buf->name = tomoyo_realpath_from_path(path); |
145 | if (buf->name) { | |
146 | tomoyo_fill_path_info(buf); | |
147 | return true; | |
b69a54ee | 148 | } |
c8c57e84 | 149 | return false; |
b69a54ee KT |
150 | } |
151 | ||
99a85259 TH |
152 | /** |
153 | * tomoyo_audit_path_log - Audit path request log. | |
154 | * | |
155 | * @r: Pointer to "struct tomoyo_request_info". | |
156 | * | |
157 | * Returns 0 on success, negative value otherwise. | |
158 | */ | |
159 | static int tomoyo_audit_path_log(struct tomoyo_request_info *r) | |
160 | { | |
161 | const char *operation = tomoyo_path_keyword[r->param.path.operation]; | |
162 | const struct tomoyo_path_info *filename = r->param.path.filename; | |
163 | if (r->granted) | |
164 | return 0; | |
165 | tomoyo_warn_log(r, "%s %s", operation, filename->name); | |
166 | return tomoyo_supervisor(r, "allow_%s %s\n", operation, | |
7c75964f | 167 | filename->name); |
99a85259 TH |
168 | } |
169 | ||
170 | /** | |
171 | * tomoyo_audit_path2_log - Audit path/path request log. | |
172 | * | |
173 | * @r: Pointer to "struct tomoyo_request_info". | |
174 | * | |
175 | * Returns 0 on success, negative value otherwise. | |
176 | */ | |
177 | static int tomoyo_audit_path2_log(struct tomoyo_request_info *r) | |
178 | { | |
179 | const char *operation = tomoyo_path2_keyword[r->param.path2.operation]; | |
180 | const struct tomoyo_path_info *filename1 = r->param.path2.filename1; | |
181 | const struct tomoyo_path_info *filename2 = r->param.path2.filename2; | |
182 | if (r->granted) | |
183 | return 0; | |
184 | tomoyo_warn_log(r, "%s %s %s", operation, filename1->name, | |
185 | filename2->name); | |
186 | return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, | |
7c75964f | 187 | filename1->name, filename2->name); |
99a85259 TH |
188 | } |
189 | ||
190 | /** | |
191 | * tomoyo_audit_mkdev_log - Audit path/number/number/number request log. | |
192 | * | |
193 | * @r: Pointer to "struct tomoyo_request_info". | |
194 | * | |
195 | * Returns 0 on success, negative value otherwise. | |
196 | */ | |
197 | static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r) | |
198 | { | |
71c28236 | 199 | const char *operation = tomoyo_mkdev_keyword[r->param.mkdev.operation]; |
99a85259 TH |
200 | const struct tomoyo_path_info *filename = r->param.mkdev.filename; |
201 | const unsigned int major = r->param.mkdev.major; | |
202 | const unsigned int minor = r->param.mkdev.minor; | |
203 | const unsigned int mode = r->param.mkdev.mode; | |
204 | if (r->granted) | |
205 | return 0; | |
206 | tomoyo_warn_log(r, "%s %s 0%o %u %u", operation, filename->name, mode, | |
207 | major, minor); | |
208 | return tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", operation, | |
7c75964f | 209 | filename->name, mode, major, minor); |
99a85259 TH |
210 | } |
211 | ||
212 | /** | |
213 | * tomoyo_audit_path_number_log - Audit path/number request log. | |
214 | * | |
215 | * @r: Pointer to "struct tomoyo_request_info". | |
216 | * @error: Error code. | |
217 | * | |
218 | * Returns 0 on success, negative value otherwise. | |
219 | */ | |
220 | static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r) | |
221 | { | |
222 | const u8 type = r->param.path_number.operation; | |
223 | u8 radix; | |
224 | const struct tomoyo_path_info *filename = r->param.path_number.filename; | |
225 | const char *operation = tomoyo_path_number_keyword[type]; | |
226 | char buffer[64]; | |
227 | if (r->granted) | |
228 | return 0; | |
229 | switch (type) { | |
230 | case TOMOYO_TYPE_CREATE: | |
231 | case TOMOYO_TYPE_MKDIR: | |
232 | case TOMOYO_TYPE_MKFIFO: | |
233 | case TOMOYO_TYPE_MKSOCK: | |
234 | case TOMOYO_TYPE_CHMOD: | |
235 | radix = TOMOYO_VALUE_TYPE_OCTAL; | |
236 | break; | |
237 | case TOMOYO_TYPE_IOCTL: | |
238 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
239 | break; | |
240 | default: | |
241 | radix = TOMOYO_VALUE_TYPE_DECIMAL; | |
242 | break; | |
243 | } | |
244 | tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number, | |
245 | radix); | |
246 | tomoyo_warn_log(r, "%s %s %s", operation, filename->name, buffer); | |
247 | return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, | |
7c75964f | 248 | filename->name, buffer); |
b69a54ee KT |
249 | } |
250 | ||
484ca79c | 251 | static bool tomoyo_check_path_acl(struct tomoyo_request_info *r, |
99a85259 | 252 | const struct tomoyo_acl_info *ptr) |
b69a54ee | 253 | { |
99a85259 TH |
254 | const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl), |
255 | head); | |
484ca79c TH |
256 | if (acl->perm & (1 << r->param.path.operation)) { |
257 | r->param.path.matched_path = | |
258 | tomoyo_compare_name_union(r->param.path.filename, | |
259 | &acl->name); | |
260 | return r->param.path.matched_path != NULL; | |
261 | } | |
262 | return false; | |
99a85259 | 263 | } |
b69a54ee | 264 | |
484ca79c | 265 | static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r, |
99a85259 TH |
266 | const struct tomoyo_acl_info *ptr) |
267 | { | |
268 | const struct tomoyo_path_number_acl *acl = | |
269 | container_of(ptr, typeof(*acl), head); | |
270 | return (acl->perm & (1 << r->param.path_number.operation)) && | |
271 | tomoyo_compare_number_union(r->param.path_number.number, | |
272 | &acl->number) && | |
273 | tomoyo_compare_name_union(r->param.path_number.filename, | |
274 | &acl->name); | |
275 | } | |
276 | ||
484ca79c | 277 | static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r, |
99a85259 TH |
278 | const struct tomoyo_acl_info *ptr) |
279 | { | |
280 | const struct tomoyo_path2_acl *acl = | |
281 | container_of(ptr, typeof(*acl), head); | |
282 | return (acl->perm & (1 << r->param.path2.operation)) && | |
283 | tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1) | |
284 | && tomoyo_compare_name_union(r->param.path2.filename2, | |
285 | &acl->name2); | |
286 | } | |
287 | ||
484ca79c | 288 | static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r, |
99a85259 TH |
289 | const struct tomoyo_acl_info *ptr) |
290 | { | |
75093152 | 291 | const struct tomoyo_mkdev_acl *acl = |
99a85259 TH |
292 | container_of(ptr, typeof(*acl), head); |
293 | return (acl->perm & (1 << r->param.mkdev.operation)) && | |
294 | tomoyo_compare_number_union(r->param.mkdev.mode, | |
295 | &acl->mode) && | |
296 | tomoyo_compare_number_union(r->param.mkdev.major, | |
297 | &acl->major) && | |
298 | tomoyo_compare_number_union(r->param.mkdev.minor, | |
299 | &acl->minor) && | |
300 | tomoyo_compare_name_union(r->param.mkdev.filename, | |
301 | &acl->name); | |
b69a54ee KT |
302 | } |
303 | ||
237ab459 TH |
304 | static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, |
305 | const struct tomoyo_acl_info *b) | |
306 | { | |
307 | const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); | |
308 | const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
309 | return tomoyo_same_acl_head(&p1->head, &p2->head) && |
310 | tomoyo_same_name_union(&p1->name, &p2->name); | |
237ab459 TH |
311 | } |
312 | ||
7c75964f TH |
313 | /** |
314 | * tomoyo_merge_path_acl - Merge duplicated "struct tomoyo_path_acl" entry. | |
315 | * | |
316 | * @a: Pointer to "struct tomoyo_acl_info". | |
317 | * @b: Pointer to "struct tomoyo_acl_info". | |
318 | * @is_delete: True for @a &= ~@b, false for @a |= @b. | |
319 | * | |
320 | * Returns true if @a is empty, false otherwise. | |
321 | */ | |
237ab459 TH |
322 | static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, |
323 | struct tomoyo_acl_info *b, | |
324 | const bool is_delete) | |
325 | { | |
326 | u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head) | |
327 | ->perm; | |
328 | u16 perm = *a_perm; | |
329 | const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; | |
7c75964f | 330 | if (is_delete) |
237ab459 | 331 | perm &= ~b_perm; |
7c75964f | 332 | else |
237ab459 | 333 | perm |= b_perm; |
237ab459 TH |
334 | *a_perm = perm; |
335 | return !perm; | |
336 | } | |
337 | ||
b69a54ee | 338 | /** |
7ef61233 | 339 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
340 | * |
341 | * @type: Type of operation. | |
342 | * @filename: Filename. | |
343 | * @domain: Pointer to "struct tomoyo_domain_info". | |
344 | * @is_delete: True if it is a delete request. | |
345 | * | |
346 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
347 | * |
348 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 349 | */ |
7ef61233 | 350 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
237ab459 | 351 | struct tomoyo_domain_info * const domain, |
7ef61233 | 352 | const bool is_delete) |
b69a54ee | 353 | { |
9e4b50e9 TH |
354 | struct tomoyo_path_acl e = { |
355 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
237ab459 | 356 | .perm = 1 << type |
9e4b50e9 | 357 | }; |
237ab459 | 358 | int error; |
7762fbff | 359 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 360 | return -EINVAL; |
237ab459 TH |
361 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
362 | tomoyo_same_path_acl, | |
363 | tomoyo_merge_path_acl); | |
7762fbff | 364 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
365 | return error; |
366 | } | |
367 | ||
75093152 | 368 | static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a, |
237ab459 TH |
369 | const struct tomoyo_acl_info *b) |
370 | { | |
75093152 | 371 | const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), |
237ab459 | 372 | head); |
75093152 | 373 | const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), |
237ab459 | 374 | head); |
75093152 TH |
375 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
376 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
377 | && tomoyo_same_number_union(&p1->mode, &p2->mode) | |
378 | && tomoyo_same_number_union(&p1->major, &p2->major) | |
379 | && tomoyo_same_number_union(&p1->minor, &p2->minor); | |
237ab459 TH |
380 | } |
381 | ||
75093152 | 382 | static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, |
237ab459 TH |
383 | struct tomoyo_acl_info *b, |
384 | const bool is_delete) | |
385 | { | |
75093152 | 386 | u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl, |
237ab459 TH |
387 | head)->perm; |
388 | u8 perm = *a_perm; | |
75093152 | 389 | const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head) |
237ab459 TH |
390 | ->perm; |
391 | if (is_delete) | |
392 | perm &= ~b_perm; | |
393 | else | |
394 | perm |= b_perm; | |
395 | *a_perm = perm; | |
396 | return !perm; | |
397 | } | |
398 | ||
a1f9bb6a | 399 | /** |
75093152 | 400 | * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list. |
a1f9bb6a TH |
401 | * |
402 | * @type: Type of operation. | |
403 | * @filename: Filename. | |
404 | * @mode: Create mode. | |
405 | * @major: Device major number. | |
406 | * @minor: Device minor number. | |
407 | * @domain: Pointer to "struct tomoyo_domain_info". | |
408 | * @is_delete: True if it is a delete request. | |
409 | * | |
410 | * Returns 0 on success, negative value otherwise. | |
237ab459 TH |
411 | * |
412 | * Caller holds tomoyo_read_lock(). | |
a1f9bb6a | 413 | */ |
75093152 | 414 | static int tomoyo_update_mkdev_acl(const u8 type, const char *filename, |
237ab459 TH |
415 | char *mode, char *major, char *minor, |
416 | struct tomoyo_domain_info * const | |
417 | domain, const bool is_delete) | |
a1f9bb6a | 418 | { |
75093152 TH |
419 | struct tomoyo_mkdev_acl e = { |
420 | .head.type = TOMOYO_TYPE_MKDEV_ACL, | |
237ab459 | 421 | .perm = 1 << type |
a1f9bb6a TH |
422 | }; |
423 | int error = is_delete ? -ENOENT : -ENOMEM; | |
424 | if (!tomoyo_parse_name_union(filename, &e.name) || | |
425 | !tomoyo_parse_number_union(mode, &e.mode) || | |
426 | !tomoyo_parse_number_union(major, &e.major) || | |
427 | !tomoyo_parse_number_union(minor, &e.minor)) | |
428 | goto out; | |
237ab459 | 429 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
75093152 TH |
430 | tomoyo_same_mkdev_acl, |
431 | tomoyo_merge_mkdev_acl); | |
a1f9bb6a TH |
432 | out: |
433 | tomoyo_put_name_union(&e.name); | |
434 | tomoyo_put_number_union(&e.mode); | |
435 | tomoyo_put_number_union(&e.major); | |
436 | tomoyo_put_number_union(&e.minor); | |
437 | return error; | |
438 | } | |
439 | ||
237ab459 TH |
440 | static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, |
441 | const struct tomoyo_acl_info *b) | |
442 | { | |
443 | const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); | |
444 | const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
445 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
446 | && tomoyo_same_name_union(&p1->name1, &p2->name1) | |
447 | && tomoyo_same_name_union(&p1->name2, &p2->name2); | |
237ab459 TH |
448 | } |
449 | ||
450 | static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a, | |
451 | struct tomoyo_acl_info *b, | |
452 | const bool is_delete) | |
453 | { | |
454 | u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head) | |
455 | ->perm; | |
456 | u8 perm = *a_perm; | |
457 | const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm; | |
458 | if (is_delete) | |
459 | perm &= ~b_perm; | |
460 | else | |
461 | perm |= b_perm; | |
462 | *a_perm = perm; | |
463 | return !perm; | |
464 | } | |
465 | ||
b69a54ee | 466 | /** |
7ef61233 | 467 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
468 | * |
469 | * @type: Type of operation. | |
470 | * @filename1: First filename. | |
471 | * @filename2: Second filename. | |
472 | * @domain: Pointer to "struct tomoyo_domain_info". | |
473 | * @is_delete: True if it is a delete request. | |
474 | * | |
475 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
476 | * |
477 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 478 | */ |
7ef61233 TH |
479 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
480 | const char *filename2, | |
237ab459 | 481 | struct tomoyo_domain_info * const domain, |
7ef61233 | 482 | const bool is_delete) |
b69a54ee | 483 | { |
9e4b50e9 TH |
484 | struct tomoyo_path2_acl e = { |
485 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
237ab459 | 486 | .perm = 1 << type |
9e4b50e9 | 487 | }; |
ca0b7df3 | 488 | int error = is_delete ? -ENOENT : -ENOMEM; |
7762fbff TH |
489 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
490 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 491 | goto out; |
237ab459 TH |
492 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
493 | tomoyo_same_path2_acl, | |
494 | tomoyo_merge_path2_acl); | |
ca0b7df3 | 495 | out: |
7762fbff TH |
496 | tomoyo_put_name_union(&e.name1); |
497 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
498 | return error; |
499 | } | |
500 | ||
b69a54ee | 501 | /** |
cb0abe6a | 502 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 503 | * |
cb0abe6a | 504 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
505 | * @operation: Type of operation. |
506 | * @filename: Filename to check. | |
b69a54ee KT |
507 | * |
508 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
509 | * |
510 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 511 | */ |
05336dee TH |
512 | int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
513 | const struct tomoyo_path_info *filename) | |
b69a54ee | 514 | { |
b69a54ee | 515 | int error; |
b69a54ee | 516 | |
57c2590f TH |
517 | r->type = tomoyo_p2mac[operation]; |
518 | r->mode = tomoyo_get_mode(r->profile, r->type); | |
519 | if (r->mode == TOMOYO_CONFIG_DISABLED) | |
520 | return 0; | |
cf6e9a64 TH |
521 | r->param_type = TOMOYO_TYPE_PATH_ACL; |
522 | r->param.path.filename = filename; | |
523 | r->param.path.operation = operation; | |
17fcfbd9 | 524 | do { |
99a85259 | 525 | tomoyo_check_acl(r, tomoyo_check_path_acl); |
99a85259 | 526 | error = tomoyo_audit_path_log(r); |
05336dee TH |
527 | /* |
528 | * Do not retry for execute request, for alias may have | |
529 | * changed. | |
530 | */ | |
531 | } while (error == TOMOYO_RETRY_REQUEST && | |
532 | operation != TOMOYO_TYPE_EXECUTE); | |
b69a54ee KT |
533 | return error; |
534 | } | |
535 | ||
237ab459 TH |
536 | static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, |
537 | const struct tomoyo_acl_info *b) | |
538 | { | |
539 | const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1), | |
540 | head); | |
541 | const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), | |
542 | head); | |
75093152 TH |
543 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
544 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
545 | && tomoyo_same_number_union(&p1->number, &p2->number); | |
237ab459 TH |
546 | } |
547 | ||
548 | static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, | |
549 | struct tomoyo_acl_info *b, | |
550 | const bool is_delete) | |
551 | { | |
552 | u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl, | |
553 | head)->perm; | |
554 | u8 perm = *a_perm; | |
555 | const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head) | |
556 | ->perm; | |
557 | if (is_delete) | |
558 | perm &= ~b_perm; | |
559 | else | |
560 | perm |= b_perm; | |
561 | *a_perm = perm; | |
562 | return !perm; | |
563 | } | |
564 | ||
a1f9bb6a TH |
565 | /** |
566 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. | |
567 | * | |
568 | * @type: Type of operation. | |
569 | * @filename: Filename. | |
570 | * @number: Number. | |
571 | * @domain: Pointer to "struct tomoyo_domain_info". | |
572 | * @is_delete: True if it is a delete request. | |
573 | * | |
574 | * Returns 0 on success, negative value otherwise. | |
575 | */ | |
237ab459 TH |
576 | static int tomoyo_update_path_number_acl(const u8 type, const char *filename, |
577 | char *number, | |
578 | struct tomoyo_domain_info * const | |
579 | domain, | |
580 | const bool is_delete) | |
a1f9bb6a | 581 | { |
a1f9bb6a TH |
582 | struct tomoyo_path_number_acl e = { |
583 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
237ab459 | 584 | .perm = 1 << type |
a1f9bb6a TH |
585 | }; |
586 | int error = is_delete ? -ENOENT : -ENOMEM; | |
a1f9bb6a TH |
587 | if (!tomoyo_parse_name_union(filename, &e.name)) |
588 | return -EINVAL; | |
589 | if (!tomoyo_parse_number_union(number, &e.number)) | |
590 | goto out; | |
237ab459 TH |
591 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
592 | tomoyo_same_path_number_acl, | |
593 | tomoyo_merge_path_number_acl); | |
a1f9bb6a TH |
594 | out: |
595 | tomoyo_put_name_union(&e.name); | |
596 | tomoyo_put_number_union(&e.number); | |
597 | return error; | |
598 | } | |
599 | ||
a1f9bb6a TH |
600 | /** |
601 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
602 | * | |
603 | * @type: Type of operation. | |
604 | * @path: Pointer to "struct path". | |
605 | * @number: Number. | |
606 | * | |
607 | * Returns 0 on success, negative value otherwise. | |
608 | */ | |
609 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
610 | unsigned long number) | |
611 | { | |
612 | struct tomoyo_request_info r; | |
613 | int error = -ENOMEM; | |
c8c57e84 | 614 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
615 | int idx; |
616 | ||
57c2590f TH |
617 | if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
618 | == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) | |
a1f9bb6a TH |
619 | return 0; |
620 | idx = tomoyo_read_lock(); | |
c8c57e84 | 621 | if (!tomoyo_get_realpath(&buf, path)) |
a1f9bb6a | 622 | goto out; |
c8c57e84 TH |
623 | if (type == TOMOYO_TYPE_MKDIR) |
624 | tomoyo_add_slash(&buf); | |
cb917cf5 TH |
625 | r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL; |
626 | r.param.path_number.operation = type; | |
627 | r.param.path_number.filename = &buf; | |
628 | r.param.path_number.number = number; | |
629 | do { | |
630 | tomoyo_check_acl(&r, tomoyo_check_path_number_acl); | |
631 | error = tomoyo_audit_path_number_log(&r); | |
632 | } while (error == TOMOYO_RETRY_REQUEST); | |
c8c57e84 | 633 | kfree(buf.name); |
cb917cf5 | 634 | out: |
a1f9bb6a TH |
635 | tomoyo_read_unlock(idx); |
636 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
637 | error = 0; | |
638 | return error; | |
639 | } | |
640 | ||
b69a54ee KT |
641 | /** |
642 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
643 | * | |
644 | * @domain: Pointer to "struct tomoyo_domain_info". | |
645 | * @path: Pointer to "struct path". | |
646 | * @flag: Flags for open(). | |
647 | * | |
648 | * Returns 0 on success, negative value otherwise. | |
649 | */ | |
650 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
651 | struct path *path, const int flag) | |
652 | { | |
653 | const u8 acc_mode = ACC_MODE(flag); | |
eae61f3c | 654 | int error = 0; |
c8c57e84 | 655 | struct tomoyo_path_info buf; |
cb0abe6a | 656 | struct tomoyo_request_info r; |
fdb8ebb7 | 657 | int idx; |
b69a54ee | 658 | |
7c75964f | 659 | if (!path->mnt) |
b69a54ee | 660 | return 0; |
57c2590f TH |
661 | buf.name = NULL; |
662 | r.mode = TOMOYO_CONFIG_DISABLED; | |
fdb8ebb7 | 663 | idx = tomoyo_read_lock(); |
7c75964f TH |
664 | if (acc_mode && |
665 | tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) | |
57c2590f TH |
666 | != TOMOYO_CONFIG_DISABLED) { |
667 | if (!tomoyo_get_realpath(&buf, path)) { | |
668 | error = -ENOMEM; | |
669 | goto out; | |
670 | } | |
7c75964f TH |
671 | if (acc_mode & MAY_READ) |
672 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_READ, | |
673 | &buf); | |
674 | if (!error && (acc_mode & MAY_WRITE)) | |
675 | error = tomoyo_path_permission(&r, (flag & O_APPEND) ? | |
676 | TOMOYO_TYPE_APPEND : | |
677 | TOMOYO_TYPE_WRITE, | |
57c2590f | 678 | &buf); |
57c2590f | 679 | } |
b69a54ee | 680 | out: |
c8c57e84 | 681 | kfree(buf.name); |
fdb8ebb7 | 682 | tomoyo_read_unlock(idx); |
cb0abe6a | 683 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
684 | error = 0; |
685 | return error; | |
686 | } | |
687 | ||
688 | /** | |
7c75964f | 689 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "append", "chroot" and "unmount". |
b69a54ee | 690 | * |
b69a54ee KT |
691 | * @operation: Type of operation. |
692 | * @path: Pointer to "struct path". | |
693 | * | |
694 | * Returns 0 on success, negative value otherwise. | |
695 | */ | |
97d6931e | 696 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee | 697 | { |
cb0abe6a | 698 | struct tomoyo_request_info r; |
7c75964f TH |
699 | int error; |
700 | struct tomoyo_path_info buf; | |
701 | bool is_enforce; | |
fdb8ebb7 | 702 | int idx; |
b69a54ee | 703 | |
57c2590f TH |
704 | if (!path->mnt) |
705 | return 0; | |
706 | if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) | |
707 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 708 | return 0; |
7c75964f TH |
709 | is_enforce = (r.mode == TOMOYO_CONFIG_ENFORCING); |
710 | error = -ENOMEM; | |
57c2590f | 711 | buf.name = NULL; |
fdb8ebb7 | 712 | idx = tomoyo_read_lock(); |
c8c57e84 | 713 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
714 | goto out; |
715 | switch (operation) { | |
7ef61233 TH |
716 | case TOMOYO_TYPE_RMDIR: |
717 | case TOMOYO_TYPE_CHROOT: | |
c8c57e84 TH |
718 | tomoyo_add_slash(&buf); |
719 | break; | |
b69a54ee | 720 | } |
c8c57e84 | 721 | error = tomoyo_path_permission(&r, operation, &buf); |
b69a54ee | 722 | out: |
c8c57e84 | 723 | kfree(buf.name); |
fdb8ebb7 | 724 | tomoyo_read_unlock(idx); |
7c75964f | 725 | if (!is_enforce) |
b69a54ee KT |
726 | error = 0; |
727 | return error; | |
728 | } | |
729 | ||
a1f9bb6a | 730 | /** |
75093152 | 731 | * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar". |
a1f9bb6a TH |
732 | * |
733 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
734 | * @path: Pointer to "struct path". | |
735 | * @mode: Create mode. | |
736 | * @dev: Device number. | |
737 | * | |
738 | * Returns 0 on success, negative value otherwise. | |
739 | */ | |
75093152 | 740 | int tomoyo_mkdev_perm(const u8 operation, struct path *path, |
a1f9bb6a TH |
741 | const unsigned int mode, unsigned int dev) |
742 | { | |
743 | struct tomoyo_request_info r; | |
744 | int error = -ENOMEM; | |
c8c57e84 | 745 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
746 | int idx; |
747 | ||
57c2590f TH |
748 | if (!path->mnt || |
749 | tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) | |
750 | == TOMOYO_CONFIG_DISABLED) | |
a1f9bb6a TH |
751 | return 0; |
752 | idx = tomoyo_read_lock(); | |
753 | error = -ENOMEM; | |
c8c57e84 | 754 | if (tomoyo_get_realpath(&buf, path)) { |
cf6e9a64 | 755 | dev = new_decode_dev(dev); |
75093152 | 756 | r.param_type = TOMOYO_TYPE_MKDEV_ACL; |
cf6e9a64 TH |
757 | r.param.mkdev.filename = &buf; |
758 | r.param.mkdev.operation = operation; | |
759 | r.param.mkdev.mode = mode; | |
760 | r.param.mkdev.major = MAJOR(dev); | |
761 | r.param.mkdev.minor = MINOR(dev); | |
99a85259 TH |
762 | tomoyo_check_acl(&r, tomoyo_check_mkdev_acl); |
763 | error = tomoyo_audit_mkdev_log(&r); | |
c8c57e84 | 764 | kfree(buf.name); |
a1f9bb6a TH |
765 | } |
766 | tomoyo_read_unlock(idx); | |
767 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
768 | error = 0; | |
769 | return error; | |
770 | } | |
771 | ||
b69a54ee | 772 | /** |
7ef61233 | 773 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 774 | * |
b69a54ee KT |
775 | * @operation: Type of operation. |
776 | * @path1: Pointer to "struct path". | |
777 | * @path2: Pointer to "struct path". | |
778 | * | |
779 | * Returns 0 on success, negative value otherwise. | |
780 | */ | |
97d6931e | 781 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 782 | struct path *path2) |
b69a54ee KT |
783 | { |
784 | int error = -ENOMEM; | |
c8c57e84 TH |
785 | struct tomoyo_path_info buf1; |
786 | struct tomoyo_path_info buf2; | |
cb0abe6a | 787 | struct tomoyo_request_info r; |
fdb8ebb7 | 788 | int idx; |
b69a54ee | 789 | |
57c2590f TH |
790 | if (!path1->mnt || !path2->mnt || |
791 | tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) | |
792 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 793 | return 0; |
c8c57e84 TH |
794 | buf1.name = NULL; |
795 | buf2.name = NULL; | |
fdb8ebb7 | 796 | idx = tomoyo_read_lock(); |
c8c57e84 TH |
797 | if (!tomoyo_get_realpath(&buf1, path1) || |
798 | !tomoyo_get_realpath(&buf2, path2)) | |
b69a54ee | 799 | goto out; |
57c2590f TH |
800 | switch (operation) { |
801 | struct dentry *dentry; | |
802 | case TOMOYO_TYPE_RENAME: | |
803 | case TOMOYO_TYPE_LINK: | |
804 | dentry = path1->dentry; | |
805 | if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) | |
806 | break; | |
807 | /* fall through */ | |
808 | case TOMOYO_TYPE_PIVOT_ROOT: | |
809 | tomoyo_add_slash(&buf1); | |
810 | tomoyo_add_slash(&buf2); | |
811 | break; | |
812 | } | |
cf6e9a64 TH |
813 | r.param_type = TOMOYO_TYPE_PATH2_ACL; |
814 | r.param.path2.operation = operation; | |
815 | r.param.path2.filename1 = &buf1; | |
816 | r.param.path2.filename2 = &buf2; | |
17fcfbd9 | 817 | do { |
99a85259 TH |
818 | tomoyo_check_acl(&r, tomoyo_check_path2_acl); |
819 | error = tomoyo_audit_path2_log(&r); | |
820 | } while (error == TOMOYO_RETRY_REQUEST); | |
b69a54ee | 821 | out: |
c8c57e84 TH |
822 | kfree(buf1.name); |
823 | kfree(buf2.name); | |
fdb8ebb7 | 824 | tomoyo_read_unlock(idx); |
cb0abe6a | 825 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
826 | error = 0; |
827 | return error; | |
828 | } | |
a1f9bb6a TH |
829 | |
830 | /** | |
e2bf6907 | 831 | * tomoyo_write_file - Update file related list. |
a1f9bb6a TH |
832 | * |
833 | * @data: String to parse. | |
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. | |
838 | * | |
839 | * Caller holds tomoyo_read_lock(). | |
840 | */ | |
e2bf6907 TH |
841 | int tomoyo_write_file(char *data, struct tomoyo_domain_info *domain, |
842 | const bool is_delete) | |
a1f9bb6a TH |
843 | { |
844 | char *w[5]; | |
845 | u8 type; | |
846 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
847 | return -EINVAL; | |
237ab459 | 848 | if (strncmp(w[0], "allow_", 6)) |
a1f9bb6a | 849 | goto out; |
a1f9bb6a TH |
850 | w[0] += 6; |
851 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
852 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
853 | continue; | |
854 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
855 | } | |
856 | if (!w[2][0]) | |
857 | goto out; | |
858 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
859 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
860 | continue; | |
861 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
862 | is_delete); | |
863 | } | |
864 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
865 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
866 | continue; | |
867 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
868 | is_delete); | |
869 | } | |
870 | if (!w[3][0] || !w[4][0]) | |
871 | goto out; | |
75093152 TH |
872 | for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) { |
873 | if (strcmp(w[0], tomoyo_mkdev_keyword[type])) | |
a1f9bb6a | 874 | continue; |
75093152 TH |
875 | return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3], |
876 | w[4], domain, is_delete); | |
a1f9bb6a TH |
877 | } |
878 | out: | |
879 | return -EINVAL; | |
880 | } |