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 | * | |
b5bc60b4 | 215 | * @r: Pointer to "struct tomoyo_request_info". |
99a85259 TH |
216 | * |
217 | * Returns 0 on success, negative value otherwise. | |
218 | */ | |
219 | static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r) | |
220 | { | |
221 | const u8 type = r->param.path_number.operation; | |
222 | u8 radix; | |
223 | const struct tomoyo_path_info *filename = r->param.path_number.filename; | |
224 | const char *operation = tomoyo_path_number_keyword[type]; | |
225 | char buffer[64]; | |
226 | if (r->granted) | |
227 | return 0; | |
228 | switch (type) { | |
229 | case TOMOYO_TYPE_CREATE: | |
230 | case TOMOYO_TYPE_MKDIR: | |
231 | case TOMOYO_TYPE_MKFIFO: | |
232 | case TOMOYO_TYPE_MKSOCK: | |
233 | case TOMOYO_TYPE_CHMOD: | |
234 | radix = TOMOYO_VALUE_TYPE_OCTAL; | |
235 | break; | |
236 | case TOMOYO_TYPE_IOCTL: | |
237 | radix = TOMOYO_VALUE_TYPE_HEXADECIMAL; | |
238 | break; | |
239 | default: | |
240 | radix = TOMOYO_VALUE_TYPE_DECIMAL; | |
241 | break; | |
242 | } | |
243 | tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number, | |
244 | radix); | |
245 | tomoyo_warn_log(r, "%s %s %s", operation, filename->name, buffer); | |
246 | return tomoyo_supervisor(r, "allow_%s %s %s\n", operation, | |
7c75964f | 247 | filename->name, buffer); |
b69a54ee KT |
248 | } |
249 | ||
484ca79c | 250 | static bool tomoyo_check_path_acl(struct tomoyo_request_info *r, |
99a85259 | 251 | const struct tomoyo_acl_info *ptr) |
b69a54ee | 252 | { |
99a85259 TH |
253 | const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl), |
254 | head); | |
484ca79c TH |
255 | if (acl->perm & (1 << r->param.path.operation)) { |
256 | r->param.path.matched_path = | |
257 | tomoyo_compare_name_union(r->param.path.filename, | |
258 | &acl->name); | |
259 | return r->param.path.matched_path != NULL; | |
260 | } | |
261 | return false; | |
99a85259 | 262 | } |
b69a54ee | 263 | |
484ca79c | 264 | static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r, |
99a85259 TH |
265 | const struct tomoyo_acl_info *ptr) |
266 | { | |
267 | const struct tomoyo_path_number_acl *acl = | |
268 | container_of(ptr, typeof(*acl), head); | |
269 | return (acl->perm & (1 << r->param.path_number.operation)) && | |
270 | tomoyo_compare_number_union(r->param.path_number.number, | |
271 | &acl->number) && | |
272 | tomoyo_compare_name_union(r->param.path_number.filename, | |
273 | &acl->name); | |
274 | } | |
275 | ||
484ca79c | 276 | static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r, |
99a85259 TH |
277 | const struct tomoyo_acl_info *ptr) |
278 | { | |
279 | const struct tomoyo_path2_acl *acl = | |
280 | container_of(ptr, typeof(*acl), head); | |
281 | return (acl->perm & (1 << r->param.path2.operation)) && | |
282 | tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1) | |
283 | && tomoyo_compare_name_union(r->param.path2.filename2, | |
284 | &acl->name2); | |
285 | } | |
286 | ||
484ca79c | 287 | static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r, |
99a85259 TH |
288 | const struct tomoyo_acl_info *ptr) |
289 | { | |
75093152 | 290 | const struct tomoyo_mkdev_acl *acl = |
99a85259 TH |
291 | container_of(ptr, typeof(*acl), head); |
292 | return (acl->perm & (1 << r->param.mkdev.operation)) && | |
293 | tomoyo_compare_number_union(r->param.mkdev.mode, | |
294 | &acl->mode) && | |
295 | tomoyo_compare_number_union(r->param.mkdev.major, | |
296 | &acl->major) && | |
297 | tomoyo_compare_number_union(r->param.mkdev.minor, | |
298 | &acl->minor) && | |
299 | tomoyo_compare_name_union(r->param.mkdev.filename, | |
300 | &acl->name); | |
b69a54ee KT |
301 | } |
302 | ||
237ab459 TH |
303 | static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, |
304 | const struct tomoyo_acl_info *b) | |
305 | { | |
306 | const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); | |
307 | const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
308 | return tomoyo_same_acl_head(&p1->head, &p2->head) && |
309 | tomoyo_same_name_union(&p1->name, &p2->name); | |
237ab459 TH |
310 | } |
311 | ||
7c75964f TH |
312 | /** |
313 | * tomoyo_merge_path_acl - Merge duplicated "struct tomoyo_path_acl" entry. | |
314 | * | |
315 | * @a: Pointer to "struct tomoyo_acl_info". | |
316 | * @b: Pointer to "struct tomoyo_acl_info". | |
317 | * @is_delete: True for @a &= ~@b, false for @a |= @b. | |
318 | * | |
319 | * Returns true if @a is empty, false otherwise. | |
320 | */ | |
237ab459 TH |
321 | static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, |
322 | struct tomoyo_acl_info *b, | |
323 | const bool is_delete) | |
324 | { | |
325 | u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head) | |
326 | ->perm; | |
327 | u16 perm = *a_perm; | |
328 | const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; | |
7c75964f | 329 | if (is_delete) |
237ab459 | 330 | perm &= ~b_perm; |
7c75964f | 331 | else |
237ab459 | 332 | perm |= b_perm; |
237ab459 TH |
333 | *a_perm = perm; |
334 | return !perm; | |
335 | } | |
336 | ||
b69a54ee | 337 | /** |
7ef61233 | 338 | * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. |
b69a54ee KT |
339 | * |
340 | * @type: Type of operation. | |
341 | * @filename: Filename. | |
342 | * @domain: Pointer to "struct tomoyo_domain_info". | |
343 | * @is_delete: True if it is a delete request. | |
344 | * | |
345 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
346 | * |
347 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 348 | */ |
7ef61233 | 349 | static int tomoyo_update_path_acl(const u8 type, const char *filename, |
237ab459 | 350 | struct tomoyo_domain_info * const domain, |
7ef61233 | 351 | const bool is_delete) |
b69a54ee | 352 | { |
9e4b50e9 TH |
353 | struct tomoyo_path_acl e = { |
354 | .head.type = TOMOYO_TYPE_PATH_ACL, | |
237ab459 | 355 | .perm = 1 << type |
9e4b50e9 | 356 | }; |
237ab459 | 357 | int error; |
7762fbff | 358 | if (!tomoyo_parse_name_union(filename, &e.name)) |
b69a54ee | 359 | return -EINVAL; |
237ab459 TH |
360 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
361 | tomoyo_same_path_acl, | |
362 | tomoyo_merge_path_acl); | |
7762fbff | 363 | tomoyo_put_name_union(&e.name); |
b69a54ee KT |
364 | return error; |
365 | } | |
366 | ||
75093152 | 367 | static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a, |
237ab459 TH |
368 | const struct tomoyo_acl_info *b) |
369 | { | |
75093152 | 370 | const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), |
237ab459 | 371 | head); |
75093152 | 372 | const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), |
237ab459 | 373 | head); |
75093152 TH |
374 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
375 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
376 | && tomoyo_same_number_union(&p1->mode, &p2->mode) | |
377 | && tomoyo_same_number_union(&p1->major, &p2->major) | |
378 | && tomoyo_same_number_union(&p1->minor, &p2->minor); | |
237ab459 TH |
379 | } |
380 | ||
75093152 | 381 | static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, |
237ab459 TH |
382 | struct tomoyo_acl_info *b, |
383 | const bool is_delete) | |
384 | { | |
75093152 | 385 | u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl, |
237ab459 TH |
386 | head)->perm; |
387 | u8 perm = *a_perm; | |
75093152 | 388 | const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head) |
237ab459 TH |
389 | ->perm; |
390 | if (is_delete) | |
391 | perm &= ~b_perm; | |
392 | else | |
393 | perm |= b_perm; | |
394 | *a_perm = perm; | |
395 | return !perm; | |
396 | } | |
397 | ||
a1f9bb6a | 398 | /** |
75093152 | 399 | * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list. |
a1f9bb6a TH |
400 | * |
401 | * @type: Type of operation. | |
402 | * @filename: Filename. | |
403 | * @mode: Create mode. | |
404 | * @major: Device major number. | |
405 | * @minor: Device minor number. | |
406 | * @domain: Pointer to "struct tomoyo_domain_info". | |
407 | * @is_delete: True if it is a delete request. | |
408 | * | |
409 | * Returns 0 on success, negative value otherwise. | |
237ab459 TH |
410 | * |
411 | * Caller holds tomoyo_read_lock(). | |
a1f9bb6a | 412 | */ |
75093152 | 413 | static int tomoyo_update_mkdev_acl(const u8 type, const char *filename, |
237ab459 TH |
414 | char *mode, char *major, char *minor, |
415 | struct tomoyo_domain_info * const | |
416 | domain, const bool is_delete) | |
a1f9bb6a | 417 | { |
75093152 TH |
418 | struct tomoyo_mkdev_acl e = { |
419 | .head.type = TOMOYO_TYPE_MKDEV_ACL, | |
237ab459 | 420 | .perm = 1 << type |
a1f9bb6a TH |
421 | }; |
422 | int error = is_delete ? -ENOENT : -ENOMEM; | |
423 | if (!tomoyo_parse_name_union(filename, &e.name) || | |
424 | !tomoyo_parse_number_union(mode, &e.mode) || | |
425 | !tomoyo_parse_number_union(major, &e.major) || | |
426 | !tomoyo_parse_number_union(minor, &e.minor)) | |
427 | goto out; | |
237ab459 | 428 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
75093152 TH |
429 | tomoyo_same_mkdev_acl, |
430 | tomoyo_merge_mkdev_acl); | |
a1f9bb6a TH |
431 | out: |
432 | tomoyo_put_name_union(&e.name); | |
433 | tomoyo_put_number_union(&e.mode); | |
434 | tomoyo_put_number_union(&e.major); | |
435 | tomoyo_put_number_union(&e.minor); | |
436 | return error; | |
437 | } | |
438 | ||
237ab459 TH |
439 | static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, |
440 | const struct tomoyo_acl_info *b) | |
441 | { | |
442 | const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); | |
443 | const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); | |
75093152 TH |
444 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
445 | && tomoyo_same_name_union(&p1->name1, &p2->name1) | |
446 | && tomoyo_same_name_union(&p1->name2, &p2->name2); | |
237ab459 TH |
447 | } |
448 | ||
449 | static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a, | |
450 | struct tomoyo_acl_info *b, | |
451 | const bool is_delete) | |
452 | { | |
453 | u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head) | |
454 | ->perm; | |
455 | u8 perm = *a_perm; | |
456 | const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm; | |
457 | if (is_delete) | |
458 | perm &= ~b_perm; | |
459 | else | |
460 | perm |= b_perm; | |
461 | *a_perm = perm; | |
462 | return !perm; | |
463 | } | |
464 | ||
b69a54ee | 465 | /** |
7ef61233 | 466 | * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. |
b69a54ee KT |
467 | * |
468 | * @type: Type of operation. | |
469 | * @filename1: First filename. | |
470 | * @filename2: Second filename. | |
471 | * @domain: Pointer to "struct tomoyo_domain_info". | |
472 | * @is_delete: True if it is a delete request. | |
473 | * | |
474 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
475 | * |
476 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 477 | */ |
7ef61233 TH |
478 | static int tomoyo_update_path2_acl(const u8 type, const char *filename1, |
479 | const char *filename2, | |
237ab459 | 480 | struct tomoyo_domain_info * const domain, |
7ef61233 | 481 | const bool is_delete) |
b69a54ee | 482 | { |
9e4b50e9 TH |
483 | struct tomoyo_path2_acl e = { |
484 | .head.type = TOMOYO_TYPE_PATH2_ACL, | |
237ab459 | 485 | .perm = 1 << type |
9e4b50e9 | 486 | }; |
ca0b7df3 | 487 | int error = is_delete ? -ENOENT : -ENOMEM; |
7762fbff TH |
488 | if (!tomoyo_parse_name_union(filename1, &e.name1) || |
489 | !tomoyo_parse_name_union(filename2, &e.name2)) | |
ca0b7df3 | 490 | goto out; |
237ab459 TH |
491 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
492 | tomoyo_same_path2_acl, | |
493 | tomoyo_merge_path2_acl); | |
ca0b7df3 | 494 | out: |
7762fbff TH |
495 | tomoyo_put_name_union(&e.name1); |
496 | tomoyo_put_name_union(&e.name2); | |
b69a54ee KT |
497 | return error; |
498 | } | |
499 | ||
b69a54ee | 500 | /** |
cb0abe6a | 501 | * tomoyo_path_permission - Check permission for single path operation. |
b69a54ee | 502 | * |
cb0abe6a | 503 | * @r: Pointer to "struct tomoyo_request_info". |
b69a54ee KT |
504 | * @operation: Type of operation. |
505 | * @filename: Filename to check. | |
b69a54ee KT |
506 | * |
507 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
508 | * |
509 | * Caller holds tomoyo_read_lock(). | |
b69a54ee | 510 | */ |
05336dee TH |
511 | int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, |
512 | const struct tomoyo_path_info *filename) | |
b69a54ee | 513 | { |
b69a54ee | 514 | int error; |
b69a54ee | 515 | |
57c2590f TH |
516 | r->type = tomoyo_p2mac[operation]; |
517 | r->mode = tomoyo_get_mode(r->profile, r->type); | |
518 | if (r->mode == TOMOYO_CONFIG_DISABLED) | |
519 | return 0; | |
cf6e9a64 TH |
520 | r->param_type = TOMOYO_TYPE_PATH_ACL; |
521 | r->param.path.filename = filename; | |
522 | r->param.path.operation = operation; | |
17fcfbd9 | 523 | do { |
99a85259 | 524 | tomoyo_check_acl(r, tomoyo_check_path_acl); |
99a85259 | 525 | error = tomoyo_audit_path_log(r); |
05336dee TH |
526 | /* |
527 | * Do not retry for execute request, for alias may have | |
528 | * changed. | |
529 | */ | |
530 | } while (error == TOMOYO_RETRY_REQUEST && | |
531 | operation != TOMOYO_TYPE_EXECUTE); | |
b69a54ee KT |
532 | return error; |
533 | } | |
534 | ||
237ab459 TH |
535 | static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, |
536 | const struct tomoyo_acl_info *b) | |
537 | { | |
538 | const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1), | |
539 | head); | |
540 | const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), | |
541 | head); | |
75093152 TH |
542 | return tomoyo_same_acl_head(&p1->head, &p2->head) |
543 | && tomoyo_same_name_union(&p1->name, &p2->name) | |
544 | && tomoyo_same_number_union(&p1->number, &p2->number); | |
237ab459 TH |
545 | } |
546 | ||
547 | static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, | |
548 | struct tomoyo_acl_info *b, | |
549 | const bool is_delete) | |
550 | { | |
551 | u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl, | |
552 | head)->perm; | |
553 | u8 perm = *a_perm; | |
554 | const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head) | |
555 | ->perm; | |
556 | if (is_delete) | |
557 | perm &= ~b_perm; | |
558 | else | |
559 | perm |= b_perm; | |
560 | *a_perm = perm; | |
561 | return !perm; | |
562 | } | |
563 | ||
a1f9bb6a TH |
564 | /** |
565 | * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL. | |
566 | * | |
567 | * @type: Type of operation. | |
568 | * @filename: Filename. | |
569 | * @number: Number. | |
570 | * @domain: Pointer to "struct tomoyo_domain_info". | |
571 | * @is_delete: True if it is a delete request. | |
572 | * | |
573 | * Returns 0 on success, negative value otherwise. | |
574 | */ | |
237ab459 TH |
575 | static int tomoyo_update_path_number_acl(const u8 type, const char *filename, |
576 | char *number, | |
577 | struct tomoyo_domain_info * const | |
578 | domain, | |
579 | const bool is_delete) | |
a1f9bb6a | 580 | { |
a1f9bb6a TH |
581 | struct tomoyo_path_number_acl e = { |
582 | .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, | |
237ab459 | 583 | .perm = 1 << type |
a1f9bb6a TH |
584 | }; |
585 | int error = is_delete ? -ENOENT : -ENOMEM; | |
a1f9bb6a TH |
586 | if (!tomoyo_parse_name_union(filename, &e.name)) |
587 | return -EINVAL; | |
588 | if (!tomoyo_parse_number_union(number, &e.number)) | |
589 | goto out; | |
237ab459 TH |
590 | error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain, |
591 | tomoyo_same_path_number_acl, | |
592 | tomoyo_merge_path_number_acl); | |
a1f9bb6a TH |
593 | out: |
594 | tomoyo_put_name_union(&e.name); | |
595 | tomoyo_put_number_union(&e.number); | |
596 | return error; | |
597 | } | |
598 | ||
a1f9bb6a TH |
599 | /** |
600 | * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
601 | * | |
602 | * @type: Type of operation. | |
603 | * @path: Pointer to "struct path". | |
604 | * @number: Number. | |
605 | * | |
606 | * Returns 0 on success, negative value otherwise. | |
607 | */ | |
608 | int tomoyo_path_number_perm(const u8 type, struct path *path, | |
609 | unsigned long number) | |
610 | { | |
611 | struct tomoyo_request_info r; | |
612 | int error = -ENOMEM; | |
c8c57e84 | 613 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
614 | int idx; |
615 | ||
57c2590f TH |
616 | if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type]) |
617 | == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) | |
a1f9bb6a TH |
618 | return 0; |
619 | idx = tomoyo_read_lock(); | |
c8c57e84 | 620 | if (!tomoyo_get_realpath(&buf, path)) |
a1f9bb6a | 621 | goto out; |
c8c57e84 TH |
622 | if (type == TOMOYO_TYPE_MKDIR) |
623 | tomoyo_add_slash(&buf); | |
cb917cf5 TH |
624 | r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL; |
625 | r.param.path_number.operation = type; | |
626 | r.param.path_number.filename = &buf; | |
627 | r.param.path_number.number = number; | |
628 | do { | |
629 | tomoyo_check_acl(&r, tomoyo_check_path_number_acl); | |
630 | error = tomoyo_audit_path_number_log(&r); | |
631 | } while (error == TOMOYO_RETRY_REQUEST); | |
c8c57e84 | 632 | kfree(buf.name); |
cb917cf5 | 633 | out: |
a1f9bb6a TH |
634 | tomoyo_read_unlock(idx); |
635 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
636 | error = 0; | |
637 | return error; | |
638 | } | |
639 | ||
b69a54ee KT |
640 | /** |
641 | * tomoyo_check_open_permission - Check permission for "read" and "write". | |
642 | * | |
643 | * @domain: Pointer to "struct tomoyo_domain_info". | |
644 | * @path: Pointer to "struct path". | |
645 | * @flag: Flags for open(). | |
646 | * | |
647 | * Returns 0 on success, negative value otherwise. | |
648 | */ | |
649 | int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, | |
650 | struct path *path, const int flag) | |
651 | { | |
652 | const u8 acc_mode = ACC_MODE(flag); | |
eae61f3c | 653 | int error = 0; |
c8c57e84 | 654 | struct tomoyo_path_info buf; |
cb0abe6a | 655 | struct tomoyo_request_info r; |
fdb8ebb7 | 656 | int idx; |
b69a54ee | 657 | |
7c75964f | 658 | if (!path->mnt) |
b69a54ee | 659 | return 0; |
57c2590f TH |
660 | buf.name = NULL; |
661 | r.mode = TOMOYO_CONFIG_DISABLED; | |
fdb8ebb7 | 662 | idx = tomoyo_read_lock(); |
7c75964f TH |
663 | if (acc_mode && |
664 | tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN) | |
57c2590f TH |
665 | != TOMOYO_CONFIG_DISABLED) { |
666 | if (!tomoyo_get_realpath(&buf, path)) { | |
667 | error = -ENOMEM; | |
668 | goto out; | |
669 | } | |
7c75964f TH |
670 | if (acc_mode & MAY_READ) |
671 | error = tomoyo_path_permission(&r, TOMOYO_TYPE_READ, | |
672 | &buf); | |
673 | if (!error && (acc_mode & MAY_WRITE)) | |
674 | error = tomoyo_path_permission(&r, (flag & O_APPEND) ? | |
675 | TOMOYO_TYPE_APPEND : | |
676 | TOMOYO_TYPE_WRITE, | |
57c2590f | 677 | &buf); |
57c2590f | 678 | } |
b69a54ee | 679 | out: |
c8c57e84 | 680 | kfree(buf.name); |
fdb8ebb7 | 681 | tomoyo_read_unlock(idx); |
cb0abe6a | 682 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
683 | error = 0; |
684 | return error; | |
685 | } | |
686 | ||
687 | /** | |
7c75964f | 688 | * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "append", "chroot" and "unmount". |
b69a54ee | 689 | * |
b69a54ee KT |
690 | * @operation: Type of operation. |
691 | * @path: Pointer to "struct path". | |
692 | * | |
693 | * Returns 0 on success, negative value otherwise. | |
694 | */ | |
97d6931e | 695 | int tomoyo_path_perm(const u8 operation, struct path *path) |
b69a54ee | 696 | { |
cb0abe6a | 697 | struct tomoyo_request_info r; |
7c75964f TH |
698 | int error; |
699 | struct tomoyo_path_info buf; | |
700 | bool is_enforce; | |
fdb8ebb7 | 701 | int idx; |
b69a54ee | 702 | |
57c2590f TH |
703 | if (!path->mnt) |
704 | return 0; | |
705 | if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation]) | |
706 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 707 | return 0; |
7c75964f TH |
708 | is_enforce = (r.mode == TOMOYO_CONFIG_ENFORCING); |
709 | error = -ENOMEM; | |
57c2590f | 710 | buf.name = NULL; |
fdb8ebb7 | 711 | idx = tomoyo_read_lock(); |
c8c57e84 | 712 | if (!tomoyo_get_realpath(&buf, path)) |
b69a54ee KT |
713 | goto out; |
714 | switch (operation) { | |
7ef61233 TH |
715 | case TOMOYO_TYPE_RMDIR: |
716 | case TOMOYO_TYPE_CHROOT: | |
c8c57e84 TH |
717 | tomoyo_add_slash(&buf); |
718 | break; | |
b69a54ee | 719 | } |
c8c57e84 | 720 | error = tomoyo_path_permission(&r, operation, &buf); |
b69a54ee | 721 | out: |
c8c57e84 | 722 | kfree(buf.name); |
fdb8ebb7 | 723 | tomoyo_read_unlock(idx); |
7c75964f | 724 | if (!is_enforce) |
b69a54ee KT |
725 | error = 0; |
726 | return error; | |
727 | } | |
728 | ||
a1f9bb6a | 729 | /** |
75093152 | 730 | * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar". |
a1f9bb6a TH |
731 | * |
732 | * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK) | |
733 | * @path: Pointer to "struct path". | |
734 | * @mode: Create mode. | |
735 | * @dev: Device number. | |
736 | * | |
737 | * Returns 0 on success, negative value otherwise. | |
738 | */ | |
75093152 | 739 | int tomoyo_mkdev_perm(const u8 operation, struct path *path, |
a1f9bb6a TH |
740 | const unsigned int mode, unsigned int dev) |
741 | { | |
742 | struct tomoyo_request_info r; | |
743 | int error = -ENOMEM; | |
c8c57e84 | 744 | struct tomoyo_path_info buf; |
a1f9bb6a TH |
745 | int idx; |
746 | ||
57c2590f TH |
747 | if (!path->mnt || |
748 | tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation]) | |
749 | == TOMOYO_CONFIG_DISABLED) | |
a1f9bb6a TH |
750 | return 0; |
751 | idx = tomoyo_read_lock(); | |
752 | error = -ENOMEM; | |
c8c57e84 | 753 | if (tomoyo_get_realpath(&buf, path)) { |
cf6e9a64 | 754 | dev = new_decode_dev(dev); |
75093152 | 755 | r.param_type = TOMOYO_TYPE_MKDEV_ACL; |
cf6e9a64 TH |
756 | r.param.mkdev.filename = &buf; |
757 | r.param.mkdev.operation = operation; | |
758 | r.param.mkdev.mode = mode; | |
759 | r.param.mkdev.major = MAJOR(dev); | |
760 | r.param.mkdev.minor = MINOR(dev); | |
99a85259 TH |
761 | tomoyo_check_acl(&r, tomoyo_check_mkdev_acl); |
762 | error = tomoyo_audit_mkdev_log(&r); | |
c8c57e84 | 763 | kfree(buf.name); |
a1f9bb6a TH |
764 | } |
765 | tomoyo_read_unlock(idx); | |
766 | if (r.mode != TOMOYO_CONFIG_ENFORCING) | |
767 | error = 0; | |
768 | return error; | |
769 | } | |
770 | ||
b69a54ee | 771 | /** |
7ef61233 | 772 | * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". |
b69a54ee | 773 | * |
b69a54ee KT |
774 | * @operation: Type of operation. |
775 | * @path1: Pointer to "struct path". | |
776 | * @path2: Pointer to "struct path". | |
777 | * | |
778 | * Returns 0 on success, negative value otherwise. | |
779 | */ | |
97d6931e | 780 | int tomoyo_path2_perm(const u8 operation, struct path *path1, |
7ef61233 | 781 | struct path *path2) |
b69a54ee KT |
782 | { |
783 | int error = -ENOMEM; | |
c8c57e84 TH |
784 | struct tomoyo_path_info buf1; |
785 | struct tomoyo_path_info buf2; | |
cb0abe6a | 786 | struct tomoyo_request_info r; |
fdb8ebb7 | 787 | int idx; |
b69a54ee | 788 | |
57c2590f TH |
789 | if (!path1->mnt || !path2->mnt || |
790 | tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation]) | |
791 | == TOMOYO_CONFIG_DISABLED) | |
b69a54ee | 792 | return 0; |
c8c57e84 TH |
793 | buf1.name = NULL; |
794 | buf2.name = NULL; | |
fdb8ebb7 | 795 | idx = tomoyo_read_lock(); |
c8c57e84 TH |
796 | if (!tomoyo_get_realpath(&buf1, path1) || |
797 | !tomoyo_get_realpath(&buf2, path2)) | |
b69a54ee | 798 | goto out; |
57c2590f TH |
799 | switch (operation) { |
800 | struct dentry *dentry; | |
801 | case TOMOYO_TYPE_RENAME: | |
802 | case TOMOYO_TYPE_LINK: | |
803 | dentry = path1->dentry; | |
804 | if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode)) | |
805 | break; | |
806 | /* fall through */ | |
807 | case TOMOYO_TYPE_PIVOT_ROOT: | |
808 | tomoyo_add_slash(&buf1); | |
809 | tomoyo_add_slash(&buf2); | |
810 | break; | |
811 | } | |
cf6e9a64 TH |
812 | r.param_type = TOMOYO_TYPE_PATH2_ACL; |
813 | r.param.path2.operation = operation; | |
814 | r.param.path2.filename1 = &buf1; | |
815 | r.param.path2.filename2 = &buf2; | |
17fcfbd9 | 816 | do { |
99a85259 TH |
817 | tomoyo_check_acl(&r, tomoyo_check_path2_acl); |
818 | error = tomoyo_audit_path2_log(&r); | |
819 | } while (error == TOMOYO_RETRY_REQUEST); | |
b69a54ee | 820 | out: |
c8c57e84 TH |
821 | kfree(buf1.name); |
822 | kfree(buf2.name); | |
fdb8ebb7 | 823 | tomoyo_read_unlock(idx); |
cb0abe6a | 824 | if (r.mode != TOMOYO_CONFIG_ENFORCING) |
b69a54ee KT |
825 | error = 0; |
826 | return error; | |
827 | } | |
a1f9bb6a TH |
828 | |
829 | /** | |
e2bf6907 | 830 | * tomoyo_write_file - Update file related list. |
a1f9bb6a TH |
831 | * |
832 | * @data: String to parse. | |
833 | * @domain: Pointer to "struct tomoyo_domain_info". | |
834 | * @is_delete: True if it is a delete request. | |
835 | * | |
836 | * Returns 0 on success, negative value otherwise. | |
837 | * | |
838 | * Caller holds tomoyo_read_lock(). | |
839 | */ | |
e2bf6907 TH |
840 | int tomoyo_write_file(char *data, struct tomoyo_domain_info *domain, |
841 | const bool is_delete) | |
a1f9bb6a TH |
842 | { |
843 | char *w[5]; | |
844 | u8 type; | |
845 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
846 | return -EINVAL; | |
237ab459 | 847 | if (strncmp(w[0], "allow_", 6)) |
a1f9bb6a | 848 | goto out; |
a1f9bb6a TH |
849 | w[0] += 6; |
850 | for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { | |
851 | if (strcmp(w[0], tomoyo_path_keyword[type])) | |
852 | continue; | |
853 | return tomoyo_update_path_acl(type, w[1], domain, is_delete); | |
854 | } | |
855 | if (!w[2][0]) | |
856 | goto out; | |
857 | for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { | |
858 | if (strcmp(w[0], tomoyo_path2_keyword[type])) | |
859 | continue; | |
860 | return tomoyo_update_path2_acl(type, w[1], w[2], domain, | |
861 | is_delete); | |
862 | } | |
863 | for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) { | |
864 | if (strcmp(w[0], tomoyo_path_number_keyword[type])) | |
865 | continue; | |
866 | return tomoyo_update_path_number_acl(type, w[1], w[2], domain, | |
867 | is_delete); | |
868 | } | |
869 | if (!w[3][0] || !w[4][0]) | |
870 | goto out; | |
75093152 TH |
871 | for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) { |
872 | if (strcmp(w[0], tomoyo_mkdev_keyword[type])) | |
a1f9bb6a | 873 | continue; |
75093152 TH |
874 | return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3], |
875 | w[4], domain, is_delete); | |
a1f9bb6a TH |
876 | } |
877 | out: | |
878 | return -EINVAL; | |
879 | } |