Commit | Line | Data |
---|---|---|
26a2a1c9 KT |
1 | /* |
2 | * security/tomoyo/domain.c | |
3 | * | |
0f2a55d5 | 4 | * Copyright (C) 2005-2011 NTT DATA CORPORATION |
26a2a1c9 KT |
5 | */ |
6 | ||
7 | #include "common.h" | |
26a2a1c9 | 8 | #include <linux/binfmts.h> |
5a0e3ad6 | 9 | #include <linux/slab.h> |
26a2a1c9 KT |
10 | |
11 | /* Variables definitions.*/ | |
12 | ||
13 | /* The initial domain. */ | |
14 | struct tomoyo_domain_info tomoyo_kernel_domain; | |
15 | ||
36f5e1ff TH |
16 | /** |
17 | * tomoyo_update_policy - Update an entry for exception policy. | |
18 | * | |
19 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
20 | * @size: Size of @new_entry in bytes. | |
a238cf5b | 21 | * @param: Pointer to "struct tomoyo_acl_param". |
36f5e1ff TH |
22 | * @check_duplicate: Callback function to find duplicated entry. |
23 | * | |
24 | * Returns 0 on success, negative value otherwise. | |
25 | * | |
26 | * Caller holds tomoyo_read_lock(). | |
27 | */ | |
28 | int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size, | |
a238cf5b | 29 | struct tomoyo_acl_param *param, |
36f5e1ff TH |
30 | bool (*check_duplicate) (const struct tomoyo_acl_head |
31 | *, | |
32 | const struct tomoyo_acl_head | |
33 | *)) | |
34 | { | |
a238cf5b | 35 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
36f5e1ff | 36 | struct tomoyo_acl_head *entry; |
a238cf5b | 37 | struct list_head *list = param->list; |
36f5e1ff TH |
38 | |
39 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
40 | return -ENOMEM; | |
41 | list_for_each_entry_rcu(entry, list, list) { | |
f9732ea1 TH |
42 | if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) |
43 | continue; | |
36f5e1ff TH |
44 | if (!check_duplicate(entry, new_entry)) |
45 | continue; | |
a238cf5b | 46 | entry->is_deleted = param->is_delete; |
36f5e1ff TH |
47 | error = 0; |
48 | break; | |
49 | } | |
a238cf5b | 50 | if (error && !param->is_delete) { |
36f5e1ff TH |
51 | entry = tomoyo_commit_ok(new_entry, size); |
52 | if (entry) { | |
53 | list_add_tail_rcu(&entry->list, list); | |
54 | error = 0; | |
55 | } | |
56 | } | |
57 | mutex_unlock(&tomoyo_policy_lock); | |
58 | return error; | |
59 | } | |
60 | ||
0df7e8b8 TH |
61 | /** |
62 | * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry. | |
63 | * | |
64 | * @a: Pointer to "struct tomoyo_acl_info". | |
65 | * @b: Pointer to "struct tomoyo_acl_info". | |
66 | * | |
67 | * Returns true if @a == @b, false otherwise. | |
68 | */ | |
69 | static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a, | |
70 | const struct tomoyo_acl_info *b) | |
71 | { | |
2066a361 | 72 | return a->type == b->type && a->cond == b->cond; |
0df7e8b8 TH |
73 | } |
74 | ||
237ab459 TH |
75 | /** |
76 | * tomoyo_update_domain - Update an entry for domain policy. | |
77 | * | |
78 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
79 | * @size: Size of @new_entry in bytes. | |
a238cf5b | 80 | * @param: Pointer to "struct tomoyo_acl_param". |
237ab459 TH |
81 | * @check_duplicate: Callback function to find duplicated entry. |
82 | * @merge_duplicate: Callback function to merge duplicated entry. | |
83 | * | |
84 | * Returns 0 on success, negative value otherwise. | |
85 | * | |
86 | * Caller holds tomoyo_read_lock(). | |
87 | */ | |
88 | int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, | |
a238cf5b | 89 | struct tomoyo_acl_param *param, |
237ab459 TH |
90 | bool (*check_duplicate) (const struct tomoyo_acl_info |
91 | *, | |
92 | const struct tomoyo_acl_info | |
93 | *), | |
94 | bool (*merge_duplicate) (struct tomoyo_acl_info *, | |
95 | struct tomoyo_acl_info *, | |
96 | const bool)) | |
97 | { | |
a238cf5b | 98 | const bool is_delete = param->is_delete; |
237ab459 TH |
99 | int error = is_delete ? -ENOENT : -ENOMEM; |
100 | struct tomoyo_acl_info *entry; | |
a238cf5b | 101 | struct list_head * const list = param->list; |
237ab459 | 102 | |
2066a361 TH |
103 | if (param->data[0]) { |
104 | new_entry->cond = tomoyo_get_condition(param); | |
105 | if (!new_entry->cond) | |
106 | return -EINVAL; | |
6bce98ed TH |
107 | /* |
108 | * Domain transition preference is allowed for only | |
109 | * "file execute" entries. | |
110 | */ | |
111 | if (new_entry->cond->transit && | |
112 | !(new_entry->type == TOMOYO_TYPE_PATH_ACL && | |
113 | container_of(new_entry, struct tomoyo_path_acl, head) | |
114 | ->perm == 1 << TOMOYO_TYPE_EXECUTE)) | |
115 | goto out; | |
2066a361 | 116 | } |
237ab459 | 117 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
2066a361 | 118 | goto out; |
a238cf5b | 119 | list_for_each_entry_rcu(entry, list, list) { |
f9732ea1 TH |
120 | if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) |
121 | continue; | |
0df7e8b8 TH |
122 | if (!tomoyo_same_acl_head(entry, new_entry) || |
123 | !check_duplicate(entry, new_entry)) | |
237ab459 TH |
124 | continue; |
125 | if (merge_duplicate) | |
126 | entry->is_deleted = merge_duplicate(entry, new_entry, | |
127 | is_delete); | |
128 | else | |
129 | entry->is_deleted = is_delete; | |
130 | error = 0; | |
131 | break; | |
132 | } | |
133 | if (error && !is_delete) { | |
134 | entry = tomoyo_commit_ok(new_entry, size); | |
135 | if (entry) { | |
a238cf5b | 136 | list_add_tail_rcu(&entry->list, list); |
237ab459 TH |
137 | error = 0; |
138 | } | |
139 | } | |
140 | mutex_unlock(&tomoyo_policy_lock); | |
2066a361 TH |
141 | out: |
142 | tomoyo_put_condition(new_entry->cond); | |
237ab459 TH |
143 | return error; |
144 | } | |
145 | ||
32997144 TH |
146 | /** |
147 | * tomoyo_check_acl - Do permission check. | |
148 | * | |
149 | * @r: Pointer to "struct tomoyo_request_info". | |
150 | * @check_entry: Callback function to check type specific parameters. | |
151 | * | |
152 | * Returns 0 on success, negative value otherwise. | |
153 | * | |
154 | * Caller holds tomoyo_read_lock(). | |
155 | */ | |
99a85259 | 156 | void tomoyo_check_acl(struct tomoyo_request_info *r, |
484ca79c | 157 | bool (*check_entry) (struct tomoyo_request_info *, |
99a85259 TH |
158 | const struct tomoyo_acl_info *)) |
159 | { | |
160 | const struct tomoyo_domain_info *domain = r->domain; | |
161 | struct tomoyo_acl_info *ptr; | |
32997144 TH |
162 | bool retried = false; |
163 | const struct list_head *list = &domain->acl_info_list; | |
99a85259 | 164 | |
32997144 TH |
165 | retry: |
166 | list_for_each_entry_rcu(ptr, list, list) { | |
99a85259 TH |
167 | if (ptr->is_deleted || ptr->type != r->param_type) |
168 | continue; | |
2066a361 TH |
169 | if (!check_entry(r, ptr)) |
170 | continue; | |
171 | if (!tomoyo_condition(r, ptr->cond)) | |
172 | continue; | |
1f067a68 | 173 | r->matched_acl = ptr; |
2066a361 TH |
174 | r->granted = true; |
175 | return; | |
99a85259 | 176 | } |
32997144 TH |
177 | if (!retried) { |
178 | retried = true; | |
bd03a3e4 | 179 | list = &domain->ns->acl_group[domain->group]; |
32997144 TH |
180 | goto retry; |
181 | } | |
99a85259 TH |
182 | r->granted = false; |
183 | } | |
184 | ||
a230f9e7 | 185 | /* The list for "struct tomoyo_domain_info". */ |
26a2a1c9 | 186 | LIST_HEAD(tomoyo_domain_list); |
26a2a1c9 | 187 | |
26a2a1c9 | 188 | /** |
e2bf6907 | 189 | * tomoyo_last_word - Get last component of a domainname. |
26a2a1c9 | 190 | * |
bd03a3e4 | 191 | * @name: Domainname to check. |
26a2a1c9 | 192 | * |
e2bf6907 | 193 | * Returns the last word of @domainname. |
26a2a1c9 | 194 | */ |
e2bf6907 | 195 | static const char *tomoyo_last_word(const char *name) |
26a2a1c9 | 196 | { |
0f2a55d5 TH |
197 | const char *cp = strrchr(name, ' '); |
198 | if (cp) | |
199 | return cp + 1; | |
200 | return name; | |
26a2a1c9 KT |
201 | } |
202 | ||
a238cf5b TH |
203 | /** |
204 | * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry. | |
205 | * | |
206 | * @a: Pointer to "struct tomoyo_acl_head". | |
207 | * @b: Pointer to "struct tomoyo_acl_head". | |
208 | * | |
209 | * Returns true if @a == @b, false otherwise. | |
210 | */ | |
e2bf6907 TH |
211 | static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a, |
212 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 213 | { |
5448ec4f TH |
214 | const struct tomoyo_transition_control *p1 = container_of(a, |
215 | typeof(*p1), | |
216 | head); | |
217 | const struct tomoyo_transition_control *p2 = container_of(b, | |
218 | typeof(*p2), | |
219 | head); | |
220 | return p1->type == p2->type && p1->is_last_name == p2->is_last_name | |
36f5e1ff TH |
221 | && p1->domainname == p2->domainname |
222 | && p1->program == p2->program; | |
223 | } | |
224 | ||
26a2a1c9 | 225 | /** |
a238cf5b | 226 | * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list. |
26a2a1c9 | 227 | * |
a238cf5b TH |
228 | * @param: Pointer to "struct tomoyo_acl_param". |
229 | * @type: Type of this entry. | |
26a2a1c9 KT |
230 | * |
231 | * Returns 0 on success, negative value otherwise. | |
232 | */ | |
a238cf5b TH |
233 | int tomoyo_write_transition_control(struct tomoyo_acl_param *param, |
234 | const u8 type) | |
26a2a1c9 | 235 | { |
5448ec4f | 236 | struct tomoyo_transition_control e = { .type = type }; |
a238cf5b TH |
237 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
238 | char *program = param->data; | |
239 | char *domainname = strstr(program, " from "); | |
240 | if (domainname) { | |
241 | *domainname = '\0'; | |
242 | domainname += 6; | |
243 | } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP || | |
244 | type == TOMOYO_TRANSITION_CONTROL_KEEP) { | |
245 | domainname = program; | |
246 | program = NULL; | |
247 | } | |
0d2171d7 | 248 | if (program && strcmp(program, "any")) { |
5448ec4f TH |
249 | if (!tomoyo_correct_path(program)) |
250 | return -EINVAL; | |
251 | e.program = tomoyo_get_name(program); | |
252 | if (!e.program) | |
253 | goto out; | |
254 | } | |
0d2171d7 | 255 | if (domainname && strcmp(domainname, "any")) { |
5448ec4f TH |
256 | if (!tomoyo_correct_domain(domainname)) { |
257 | if (!tomoyo_correct_path(domainname)) | |
258 | goto out; | |
9e4b50e9 | 259 | e.is_last_name = true; |
5448ec4f | 260 | } |
9e4b50e9 TH |
261 | e.domainname = tomoyo_get_name(domainname); |
262 | if (!e.domainname) | |
ca0b7df3 | 263 | goto out; |
26a2a1c9 | 264 | } |
bd03a3e4 | 265 | param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; |
a238cf5b | 266 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 267 | tomoyo_same_transition_control); |
a238cf5b | 268 | out: |
9e4b50e9 TH |
269 | tomoyo_put_name(e.domainname); |
270 | tomoyo_put_name(e.program); | |
26a2a1c9 KT |
271 | return error; |
272 | } | |
273 | ||
26a2a1c9 | 274 | /** |
bd03a3e4 | 275 | * tomoyo_scan_transition - Try to find specific domain transition type. |
26a2a1c9 | 276 | * |
bd03a3e4 TH |
277 | * @list: Pointer to "struct list_head". |
278 | * @domainname: The name of current domain. | |
279 | * @program: The name of requested program. | |
280 | * @last_name: The last component of @domainname. | |
281 | * @type: One of values in "enum tomoyo_transition_type". | |
26a2a1c9 | 282 | * |
bd03a3e4 | 283 | * Returns true if found one, false otherwise. |
fdb8ebb7 TH |
284 | * |
285 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 286 | */ |
bd03a3e4 TH |
287 | static inline bool tomoyo_scan_transition |
288 | (const struct list_head *list, const struct tomoyo_path_info *domainname, | |
289 | const struct tomoyo_path_info *program, const char *last_name, | |
290 | const enum tomoyo_transition_type type) | |
26a2a1c9 | 291 | { |
5448ec4f | 292 | const struct tomoyo_transition_control *ptr; |
bd03a3e4 TH |
293 | list_for_each_entry_rcu(ptr, list, head.list) { |
294 | if (ptr->head.is_deleted || ptr->type != type) | |
295 | continue; | |
296 | if (ptr->domainname) { | |
297 | if (!ptr->is_last_name) { | |
298 | if (ptr->domainname != domainname) | |
299 | continue; | |
300 | } else { | |
5448ec4f | 301 | /* |
bd03a3e4 TH |
302 | * Use direct strcmp() since this is |
303 | * unlikely used. | |
5448ec4f | 304 | */ |
bd03a3e4 TH |
305 | if (strcmp(ptr->domainname->name, last_name)) |
306 | continue; | |
5448ec4f | 307 | } |
26a2a1c9 | 308 | } |
bd03a3e4 TH |
309 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) |
310 | continue; | |
311 | return true; | |
312 | } | |
313 | return false; | |
314 | } | |
315 | ||
316 | /** | |
317 | * tomoyo_transition_type - Get domain transition type. | |
318 | * | |
319 | * @ns: Pointer to "struct tomoyo_policy_namespace". | |
320 | * @domainname: The name of current domain. | |
321 | * @program: The name of requested program. | |
322 | * | |
323 | * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes | |
324 | * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if | |
325 | * executing @program reinitializes domain transition within that namespace, | |
326 | * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname , | |
327 | * others otherwise. | |
328 | * | |
329 | * Caller holds tomoyo_read_lock(). | |
330 | */ | |
331 | static enum tomoyo_transition_type tomoyo_transition_type | |
332 | (const struct tomoyo_policy_namespace *ns, | |
333 | const struct tomoyo_path_info *domainname, | |
334 | const struct tomoyo_path_info *program) | |
335 | { | |
336 | const char *last_name = tomoyo_last_word(domainname->name); | |
337 | enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET; | |
338 | while (type < TOMOYO_MAX_TRANSITION_TYPE) { | |
339 | const struct list_head * const list = | |
340 | &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; | |
341 | if (!tomoyo_scan_transition(list, domainname, program, | |
342 | last_name, type)) { | |
343 | type++; | |
344 | continue; | |
345 | } | |
346 | if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET && | |
347 | type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE) | |
348 | break; | |
349 | /* | |
350 | * Do not check for reset_domain if no_reset_domain matched. | |
351 | * Do not check for initialize_domain if no_initialize_domain | |
352 | * matched. | |
353 | */ | |
354 | type++; | |
355 | type++; | |
26a2a1c9 | 356 | } |
5448ec4f | 357 | return type; |
26a2a1c9 KT |
358 | } |
359 | ||
a238cf5b TH |
360 | /** |
361 | * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry. | |
362 | * | |
363 | * @a: Pointer to "struct tomoyo_acl_head". | |
364 | * @b: Pointer to "struct tomoyo_acl_head". | |
365 | * | |
366 | * Returns true if @a == @b, false otherwise. | |
367 | */ | |
e2bf6907 TH |
368 | static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a, |
369 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 370 | { |
a238cf5b TH |
371 | const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1), |
372 | head); | |
373 | const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2), | |
374 | head); | |
36f5e1ff TH |
375 | return p1->original_name == p2->original_name && |
376 | p1->aggregated_name == p2->aggregated_name; | |
377 | } | |
378 | ||
1084307c | 379 | /** |
a238cf5b | 380 | * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list. |
1084307c | 381 | * |
a238cf5b | 382 | * @param: Pointer to "struct tomoyo_acl_param". |
1084307c TH |
383 | * |
384 | * Returns 0 on success, negative value otherwise. | |
385 | * | |
386 | * Caller holds tomoyo_read_lock(). | |
387 | */ | |
a238cf5b | 388 | int tomoyo_write_aggregator(struct tomoyo_acl_param *param) |
1084307c | 389 | { |
e2bf6907 | 390 | struct tomoyo_aggregator e = { }; |
a238cf5b TH |
391 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
392 | const char *original_name = tomoyo_read_token(param); | |
393 | const char *aggregated_name = tomoyo_read_token(param); | |
394 | if (!tomoyo_correct_word(original_name) || | |
75093152 | 395 | !tomoyo_correct_path(aggregated_name)) |
1084307c TH |
396 | return -EINVAL; |
397 | e.original_name = tomoyo_get_name(original_name); | |
398 | e.aggregated_name = tomoyo_get_name(aggregated_name); | |
399 | if (!e.original_name || !e.aggregated_name || | |
400 | e.aggregated_name->is_patterned) /* No patterns allowed. */ | |
401 | goto out; | |
bd03a3e4 | 402 | param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR]; |
a238cf5b | 403 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 404 | tomoyo_same_aggregator); |
a238cf5b | 405 | out: |
1084307c TH |
406 | tomoyo_put_name(e.original_name); |
407 | tomoyo_put_name(e.aggregated_name); | |
408 | return error; | |
409 | } | |
410 | ||
26a2a1c9 | 411 | /** |
bd03a3e4 | 412 | * tomoyo_find_namespace - Find specified namespace. |
26a2a1c9 | 413 | * |
bd03a3e4 TH |
414 | * @name: Name of namespace to find. |
415 | * @len: Length of @name. | |
26a2a1c9 | 416 | * |
bd03a3e4 TH |
417 | * Returns pointer to "struct tomoyo_policy_namespace" if found, |
418 | * NULL otherwise. | |
fdb8ebb7 TH |
419 | * |
420 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 421 | */ |
bd03a3e4 TH |
422 | static struct tomoyo_policy_namespace *tomoyo_find_namespace |
423 | (const char *name, const unsigned int len) | |
26a2a1c9 | 424 | { |
bd03a3e4 TH |
425 | struct tomoyo_policy_namespace *ns; |
426 | list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { | |
427 | if (strncmp(name, ns->name, len) || | |
428 | (name[len] && name[len] != ' ')) | |
429 | continue; | |
430 | return ns; | |
431 | } | |
432 | return NULL; | |
433 | } | |
26a2a1c9 | 434 | |
bd03a3e4 TH |
435 | /** |
436 | * tomoyo_assign_namespace - Create a new namespace. | |
437 | * | |
438 | * @domainname: Name of namespace to create. | |
439 | * | |
440 | * Returns pointer to "struct tomoyo_policy_namespace" on success, | |
441 | * NULL otherwise. | |
442 | * | |
443 | * Caller holds tomoyo_read_lock(). | |
444 | */ | |
445 | struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname) | |
446 | { | |
447 | struct tomoyo_policy_namespace *ptr; | |
448 | struct tomoyo_policy_namespace *entry; | |
449 | const char *cp = domainname; | |
450 | unsigned int len = 0; | |
451 | while (*cp && *cp++ != ' ') | |
452 | len++; | |
453 | ptr = tomoyo_find_namespace(domainname, len); | |
454 | if (ptr) | |
455 | return ptr; | |
456 | if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname)) | |
ca0b7df3 | 457 | return NULL; |
bd03a3e4 TH |
458 | entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS); |
459 | if (!entry) | |
ca0b7df3 | 460 | return NULL; |
29282381 TH |
461 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
462 | goto out; | |
bd03a3e4 TH |
463 | ptr = tomoyo_find_namespace(domainname, len); |
464 | if (!ptr && tomoyo_memory_ok(entry)) { | |
465 | char *name = (char *) (entry + 1); | |
466 | ptr = entry; | |
467 | memmove(name, domainname, len); | |
468 | name[len] = '\0'; | |
469 | entry->name = name; | |
470 | tomoyo_init_policy_namespace(entry); | |
ca0b7df3 | 471 | entry = NULL; |
26a2a1c9 | 472 | } |
f737d95d | 473 | mutex_unlock(&tomoyo_policy_lock); |
bd03a3e4 | 474 | out: |
ca0b7df3 | 475 | kfree(entry); |
bd03a3e4 TH |
476 | return ptr; |
477 | } | |
478 | ||
479 | /** | |
480 | * tomoyo_namespace_jump - Check for namespace jump. | |
481 | * | |
482 | * @domainname: Name of domain. | |
483 | * | |
484 | * Returns true if namespace differs, false otherwise. | |
485 | */ | |
486 | static bool tomoyo_namespace_jump(const char *domainname) | |
487 | { | |
488 | const char *namespace = tomoyo_current_namespace()->name; | |
489 | const int len = strlen(namespace); | |
490 | return strncmp(domainname, namespace, len) || | |
491 | (domainname[len] && domainname[len] != ' '); | |
492 | } | |
493 | ||
494 | /** | |
495 | * tomoyo_assign_domain - Create a domain or a namespace. | |
496 | * | |
497 | * @domainname: The name of domain. | |
498 | * @transit: True if transit to domain found or created. | |
499 | * | |
500 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
501 | * | |
502 | * Caller holds tomoyo_read_lock(). | |
503 | */ | |
504 | struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, | |
505 | const bool transit) | |
506 | { | |
507 | struct tomoyo_domain_info e = { }; | |
508 | struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname); | |
509 | bool created = false; | |
510 | if (entry) { | |
511 | if (transit) { | |
512 | /* | |
513 | * Since namespace is created at runtime, profiles may | |
514 | * not be created by the moment the process transits to | |
515 | * that domain. Do not perform domain transition if | |
516 | * profile for that domain is not yet created. | |
517 | */ | |
e00fb3f7 TH |
518 | if (tomoyo_policy_loaded && |
519 | !entry->ns->profile_ptr[entry->profile]) | |
bd03a3e4 TH |
520 | return NULL; |
521 | } | |
522 | return entry; | |
523 | } | |
524 | /* Requested domain does not exist. */ | |
525 | /* Don't create requested domain if domainname is invalid. */ | |
526 | if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 || | |
527 | !tomoyo_correct_domain(domainname)) | |
528 | return NULL; | |
529 | /* | |
530 | * Since definition of profiles and acl_groups may differ across | |
531 | * namespaces, do not inherit "use_profile" and "use_group" settings | |
532 | * by automatically creating requested domain upon domain transition. | |
533 | */ | |
534 | if (transit && tomoyo_namespace_jump(domainname)) | |
535 | return NULL; | |
536 | e.ns = tomoyo_assign_namespace(domainname); | |
537 | if (!e.ns) | |
538 | return NULL; | |
539 | /* | |
540 | * "use_profile" and "use_group" settings for automatically created | |
541 | * domains are inherited from current domain. These are 0 for manually | |
542 | * created domains. | |
543 | */ | |
544 | if (transit) { | |
545 | const struct tomoyo_domain_info *domain = tomoyo_domain(); | |
546 | e.profile = domain->profile; | |
547 | e.group = domain->group; | |
548 | } | |
549 | e.domainname = tomoyo_get_name(domainname); | |
550 | if (!e.domainname) | |
551 | return NULL; | |
552 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
553 | goto out; | |
554 | entry = tomoyo_find_domain(domainname); | |
555 | if (!entry) { | |
556 | entry = tomoyo_commit_ok(&e, sizeof(e)); | |
557 | if (entry) { | |
558 | INIT_LIST_HEAD(&entry->acl_info_list); | |
559 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); | |
560 | created = true; | |
561 | } | |
562 | } | |
563 | mutex_unlock(&tomoyo_policy_lock); | |
564 | out: | |
565 | tomoyo_put_name(e.domainname); | |
566 | if (entry && transit) { | |
567 | if (created) { | |
568 | struct tomoyo_request_info r; | |
569 | tomoyo_init_request_info(&r, entry, | |
570 | TOMOYO_MAC_FILE_EXECUTE); | |
571 | r.granted = false; | |
572 | tomoyo_write_log(&r, "use_profile %u\n", | |
573 | entry->profile); | |
574 | tomoyo_write_log(&r, "use_group %u\n", entry->group); | |
778c4a4d | 575 | tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); |
bd03a3e4 TH |
576 | } |
577 | } | |
578 | return entry; | |
26a2a1c9 KT |
579 | } |
580 | ||
d58e0da8 TH |
581 | /** |
582 | * tomoyo_environ - Check permission for environment variable names. | |
583 | * | |
584 | * @ee: Pointer to "struct tomoyo_execve". | |
585 | * | |
586 | * Returns 0 on success, negative value otherwise. | |
587 | */ | |
588 | static int tomoyo_environ(struct tomoyo_execve *ee) | |
589 | { | |
590 | struct tomoyo_request_info *r = &ee->r; | |
591 | struct linux_binprm *bprm = ee->bprm; | |
592 | /* env_page.data is allocated by tomoyo_dump_page(). */ | |
593 | struct tomoyo_page_dump env_page = { }; | |
594 | char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */ | |
595 | int arg_len = 0; | |
596 | unsigned long pos = bprm->p; | |
597 | int offset = pos % PAGE_SIZE; | |
598 | int argv_count = bprm->argc; | |
599 | int envp_count = bprm->envc; | |
600 | int error = -ENOMEM; | |
601 | ||
602 | ee->r.type = TOMOYO_MAC_ENVIRON; | |
603 | ee->r.profile = r->domain->profile; | |
604 | ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile, | |
605 | TOMOYO_MAC_ENVIRON); | |
606 | if (!r->mode || !envp_count) | |
607 | return 0; | |
608 | arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
609 | if (!arg_ptr) | |
610 | goto out; | |
611 | while (error == -ENOMEM) { | |
612 | if (!tomoyo_dump_page(bprm, pos, &env_page)) | |
613 | goto out; | |
614 | pos += PAGE_SIZE - offset; | |
615 | /* Read. */ | |
616 | while (argv_count && offset < PAGE_SIZE) { | |
617 | if (!env_page.data[offset++]) | |
618 | argv_count--; | |
619 | } | |
620 | if (argv_count) { | |
621 | offset = 0; | |
622 | continue; | |
623 | } | |
624 | while (offset < PAGE_SIZE) { | |
625 | const unsigned char c = env_page.data[offset++]; | |
626 | ||
627 | if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) { | |
628 | if (c == '=') { | |
629 | arg_ptr[arg_len++] = '\0'; | |
630 | } else if (c == '\\') { | |
631 | arg_ptr[arg_len++] = '\\'; | |
632 | arg_ptr[arg_len++] = '\\'; | |
633 | } else if (c > ' ' && c < 127) { | |
634 | arg_ptr[arg_len++] = c; | |
635 | } else { | |
636 | arg_ptr[arg_len++] = '\\'; | |
637 | arg_ptr[arg_len++] = (c >> 6) + '0'; | |
638 | arg_ptr[arg_len++] | |
639 | = ((c >> 3) & 7) + '0'; | |
640 | arg_ptr[arg_len++] = (c & 7) + '0'; | |
641 | } | |
642 | } else { | |
643 | arg_ptr[arg_len] = '\0'; | |
644 | } | |
645 | if (c) | |
646 | continue; | |
647 | if (tomoyo_env_perm(r, arg_ptr)) { | |
648 | error = -EPERM; | |
649 | break; | |
650 | } | |
651 | if (!--envp_count) { | |
652 | error = 0; | |
653 | break; | |
654 | } | |
655 | arg_len = 0; | |
656 | } | |
657 | offset = 0; | |
658 | } | |
659 | out: | |
660 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
661 | error = 0; | |
662 | kfree(env_page.data); | |
663 | kfree(arg_ptr); | |
664 | return error; | |
665 | } | |
666 | ||
26a2a1c9 KT |
667 | /** |
668 | * tomoyo_find_next_domain - Find a domain. | |
669 | * | |
56f8c9bc | 670 | * @bprm: Pointer to "struct linux_binprm". |
26a2a1c9 KT |
671 | * |
672 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
673 | * |
674 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 675 | */ |
56f8c9bc | 676 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
26a2a1c9 | 677 | { |
26a2a1c9 KT |
678 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
679 | struct tomoyo_domain_info *domain = NULL; | |
26a2a1c9 | 680 | const char *original_name = bprm->filename; |
26a2a1c9 | 681 | int retval = -ENOMEM; |
bd03a3e4 | 682 | bool reject_on_transition_failure = false; |
a8f76409 TH |
683 | const struct tomoyo_path_info *candidate; |
684 | struct tomoyo_path_info exename; | |
97fb35e4 | 685 | struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS); |
d58e0da8 | 686 | |
97fb35e4 TH |
687 | if (!ee) |
688 | return -ENOMEM; | |
689 | ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
690 | if (!ee->tmp) { | |
691 | kfree(ee); | |
692 | return -ENOMEM; | |
693 | } | |
694 | /* ee->dump->data is allocated by tomoyo_dump_page(). */ | |
695 | tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE); | |
696 | ee->r.ee = ee; | |
697 | ee->bprm = bprm; | |
698 | ee->r.obj = &ee->obj; | |
699 | ee->obj.path1 = bprm->file->f_path; | |
0617c7ff | 700 | /* Get symlink's pathname of program. */ |
26a2a1c9 | 701 | retval = -ENOENT; |
a8f76409 TH |
702 | exename.name = tomoyo_realpath_nofollow(original_name); |
703 | if (!exename.name) | |
26a2a1c9 | 704 | goto out; |
a8f76409 TH |
705 | tomoyo_fill_path_info(&exename); |
706 | retry: | |
1084307c TH |
707 | /* Check 'aggregator' directive. */ |
708 | { | |
e2bf6907 | 709 | struct tomoyo_aggregator *ptr; |
bd03a3e4 TH |
710 | struct list_head *list = |
711 | &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR]; | |
712 | /* Check 'aggregator' directive. */ | |
a8f76409 | 713 | candidate = &exename; |
bd03a3e4 | 714 | list_for_each_entry_rcu(ptr, list, head.list) { |
82e0f001 | 715 | if (ptr->head.is_deleted || |
a8f76409 | 716 | !tomoyo_path_matches_pattern(&exename, |
1084307c TH |
717 | ptr->original_name)) |
718 | continue; | |
a8f76409 | 719 | candidate = ptr->aggregated_name; |
1084307c TH |
720 | break; |
721 | } | |
722 | } | |
723 | ||
26a2a1c9 | 724 | /* Check execute permission. */ |
6bce98ed | 725 | retval = tomoyo_execute_permission(&ee->r, candidate); |
17fcfbd9 TH |
726 | if (retval == TOMOYO_RETRY_REQUEST) |
727 | goto retry; | |
26a2a1c9 KT |
728 | if (retval < 0) |
729 | goto out; | |
484ca79c TH |
730 | /* |
731 | * To be able to specify domainnames with wildcards, use the | |
732 | * pathname specified in the policy (which may contain | |
733 | * wildcard) rather than the pathname passed to execve() | |
734 | * (which never contains wildcard). | |
735 | */ | |
a8f76409 TH |
736 | if (ee->r.param.path.matched_path) |
737 | candidate = ee->r.param.path.matched_path; | |
26a2a1c9 | 738 | |
6bce98ed TH |
739 | /* |
740 | * Check for domain transition preference if "file execute" matched. | |
741 | * If preference is given, make do_execve() fail if domain transition | |
742 | * has failed, for domain transition preference should be used with | |
743 | * destination domain defined. | |
744 | */ | |
745 | if (ee->transition) { | |
746 | const char *domainname = ee->transition->name; | |
747 | reject_on_transition_failure = true; | |
748 | if (!strcmp(domainname, "keep")) | |
749 | goto force_keep_domain; | |
750 | if (!strcmp(domainname, "child")) | |
751 | goto force_child_domain; | |
752 | if (!strcmp(domainname, "reset")) | |
753 | goto force_reset_domain; | |
754 | if (!strcmp(domainname, "initialize")) | |
755 | goto force_initialize_domain; | |
756 | if (!strcmp(domainname, "parent")) { | |
757 | char *cp; | |
758 | strncpy(ee->tmp, old_domain->domainname->name, | |
759 | TOMOYO_EXEC_TMPSIZE - 1); | |
760 | cp = strrchr(ee->tmp, ' '); | |
761 | if (cp) | |
762 | *cp = '\0'; | |
763 | } else if (*domainname == '<') | |
764 | strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1); | |
765 | else | |
766 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", | |
767 | old_domain->domainname->name, domainname); | |
768 | goto force_jump_domain; | |
769 | } | |
770 | /* | |
771 | * No domain transition preference specified. | |
772 | * Calculate domain to transit to. | |
773 | */ | |
bd03a3e4 | 774 | switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname, |
a8f76409 | 775 | candidate)) { |
bd03a3e4 | 776 | case TOMOYO_TRANSITION_CONTROL_RESET: |
6bce98ed | 777 | force_reset_domain: |
bd03a3e4 | 778 | /* Transit to the root of specified namespace. */ |
a8f76409 TH |
779 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", |
780 | candidate->name); | |
bd03a3e4 TH |
781 | /* |
782 | * Make do_execve() fail if domain transition across namespaces | |
783 | * has failed. | |
784 | */ | |
785 | reject_on_transition_failure = true; | |
786 | break; | |
5448ec4f | 787 | case TOMOYO_TRANSITION_CONTROL_INITIALIZE: |
6bce98ed | 788 | force_initialize_domain: |
bd03a3e4 | 789 | /* Transit to the child of current namespace's root. */ |
97fb35e4 | 790 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
a8f76409 | 791 | old_domain->ns->name, candidate->name); |
5448ec4f TH |
792 | break; |
793 | case TOMOYO_TRANSITION_CONTROL_KEEP: | |
6bce98ed | 794 | force_keep_domain: |
26a2a1c9 KT |
795 | /* Keep current domain. */ |
796 | domain = old_domain; | |
5448ec4f TH |
797 | break; |
798 | default: | |
799 | if (old_domain == &tomoyo_kernel_domain && | |
800 | !tomoyo_policy_loaded) { | |
801 | /* | |
802 | * Needn't to transit from kernel domain before | |
803 | * starting /sbin/init. But transit from kernel domain | |
804 | * if executing initializers because they might start | |
805 | * before /sbin/init. | |
806 | */ | |
807 | domain = old_domain; | |
a8f76409 | 808 | break; |
5448ec4f | 809 | } |
6bce98ed | 810 | force_child_domain: |
a8f76409 TH |
811 | /* Normal domain transition. */ |
812 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", | |
813 | old_domain->domainname->name, candidate->name); | |
5448ec4f | 814 | break; |
26a2a1c9 | 815 | } |
6bce98ed | 816 | force_jump_domain: |
7c75964f | 817 | if (!domain) |
97fb35e4 | 818 | domain = tomoyo_assign_domain(ee->tmp, true); |
26a2a1c9 | 819 | if (domain) |
bd03a3e4 TH |
820 | retval = 0; |
821 | else if (reject_on_transition_failure) { | |
97fb35e4 TH |
822 | printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n", |
823 | ee->tmp); | |
bd03a3e4 | 824 | retval = -ENOMEM; |
97fb35e4 | 825 | } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING) |
bd03a3e4 TH |
826 | retval = -ENOMEM; |
827 | else { | |
828 | retval = 0; | |
2c47ab93 TH |
829 | if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) { |
830 | old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true; | |
97fb35e4 TH |
831 | ee->r.granted = false; |
832 | tomoyo_write_log(&ee->r, "%s", tomoyo_dif | |
2c47ab93 | 833 | [TOMOYO_DIF_TRANSITION_FAILED]); |
bd03a3e4 | 834 | printk(KERN_WARNING |
97fb35e4 | 835 | "ERROR: Domain '%s' not defined.\n", ee->tmp); |
bd03a3e4 TH |
836 | } |
837 | } | |
26a2a1c9 | 838 | out: |
56f8c9bc TH |
839 | if (!domain) |
840 | domain = old_domain; | |
ec8e6a4e TH |
841 | /* Update reference count on "struct tomoyo_domain_info". */ |
842 | atomic_inc(&domain->users); | |
56f8c9bc | 843 | bprm->cred->security = domain; |
a8f76409 | 844 | kfree(exename.name); |
d58e0da8 TH |
845 | if (!retval) { |
846 | ee->r.domain = domain; | |
847 | retval = tomoyo_environ(ee); | |
848 | } | |
97fb35e4 TH |
849 | kfree(ee->tmp); |
850 | kfree(ee->dump.data); | |
851 | kfree(ee); | |
26a2a1c9 KT |
852 | return retval; |
853 | } | |
5b636857 TH |
854 | |
855 | /** | |
856 | * tomoyo_dump_page - Dump a page to buffer. | |
857 | * | |
858 | * @bprm: Pointer to "struct linux_binprm". | |
859 | * @pos: Location to dump. | |
860 | * @dump: Poiner to "struct tomoyo_page_dump". | |
861 | * | |
862 | * Returns true on success, false otherwise. | |
863 | */ | |
864 | bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos, | |
865 | struct tomoyo_page_dump *dump) | |
866 | { | |
867 | struct page *page; | |
d58e0da8 TH |
868 | |
869 | /* dump->data is released by tomoyo_find_next_domain(). */ | |
5b636857 TH |
870 | if (!dump->data) { |
871 | dump->data = kzalloc(PAGE_SIZE, GFP_NOFS); | |
872 | if (!dump->data) | |
873 | return false; | |
874 | } | |
875 | /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ | |
876 | #ifdef CONFIG_MMU | |
877 | if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) | |
878 | return false; | |
879 | #else | |
880 | page = bprm->page[pos / PAGE_SIZE]; | |
881 | #endif | |
882 | if (page != dump->page) { | |
883 | const unsigned int offset = pos % PAGE_SIZE; | |
884 | /* | |
885 | * Maybe kmap()/kunmap() should be used here. | |
886 | * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). | |
887 | * So do I. | |
888 | */ | |
c58e0377 | 889 | char *kaddr = kmap_atomic(page); |
d58e0da8 | 890 | |
5b636857 TH |
891 | dump->page = page; |
892 | memcpy(dump->data + offset, kaddr + offset, | |
893 | PAGE_SIZE - offset); | |
c58e0377 | 894 | kunmap_atomic(kaddr); |
5b636857 TH |
895 | } |
896 | /* Same with put_arg_page(page) in fs/exec.c */ | |
897 | #ifdef CONFIG_MMU | |
898 | put_page(page); | |
899 | #endif | |
900 | return true; | |
901 | } |