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" | |
b2d09103 | 8 | |
26a2a1c9 | 9 | #include <linux/binfmts.h> |
5a0e3ad6 | 10 | #include <linux/slab.h> |
b2d09103 | 11 | #include <linux/rculist.h> |
26a2a1c9 KT |
12 | |
13 | /* Variables definitions.*/ | |
14 | ||
15 | /* The initial domain. */ | |
16 | struct tomoyo_domain_info tomoyo_kernel_domain; | |
17 | ||
36f5e1ff TH |
18 | /** |
19 | * tomoyo_update_policy - Update an entry for exception policy. | |
20 | * | |
21 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
22 | * @size: Size of @new_entry in bytes. | |
a238cf5b | 23 | * @param: Pointer to "struct tomoyo_acl_param". |
36f5e1ff TH |
24 | * @check_duplicate: Callback function to find duplicated entry. |
25 | * | |
26 | * Returns 0 on success, negative value otherwise. | |
27 | * | |
28 | * Caller holds tomoyo_read_lock(). | |
29 | */ | |
30 | int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size, | |
a238cf5b | 31 | struct tomoyo_acl_param *param, |
36f5e1ff TH |
32 | bool (*check_duplicate) (const struct tomoyo_acl_head |
33 | *, | |
34 | const struct tomoyo_acl_head | |
35 | *)) | |
36 | { | |
a238cf5b | 37 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
36f5e1ff | 38 | struct tomoyo_acl_head *entry; |
a238cf5b | 39 | struct list_head *list = param->list; |
36f5e1ff TH |
40 | |
41 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
42 | return -ENOMEM; | |
43 | list_for_each_entry_rcu(entry, list, list) { | |
f9732ea1 TH |
44 | if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) |
45 | continue; | |
36f5e1ff TH |
46 | if (!check_duplicate(entry, new_entry)) |
47 | continue; | |
a238cf5b | 48 | entry->is_deleted = param->is_delete; |
36f5e1ff TH |
49 | error = 0; |
50 | break; | |
51 | } | |
a238cf5b | 52 | if (error && !param->is_delete) { |
36f5e1ff TH |
53 | entry = tomoyo_commit_ok(new_entry, size); |
54 | if (entry) { | |
55 | list_add_tail_rcu(&entry->list, list); | |
56 | error = 0; | |
57 | } | |
58 | } | |
59 | mutex_unlock(&tomoyo_policy_lock); | |
60 | return error; | |
61 | } | |
62 | ||
0df7e8b8 TH |
63 | /** |
64 | * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry. | |
65 | * | |
66 | * @a: Pointer to "struct tomoyo_acl_info". | |
67 | * @b: Pointer to "struct tomoyo_acl_info". | |
68 | * | |
69 | * Returns true if @a == @b, false otherwise. | |
70 | */ | |
71 | static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a, | |
72 | const struct tomoyo_acl_info *b) | |
73 | { | |
2066a361 | 74 | return a->type == b->type && a->cond == b->cond; |
0df7e8b8 TH |
75 | } |
76 | ||
237ab459 TH |
77 | /** |
78 | * tomoyo_update_domain - Update an entry for domain policy. | |
79 | * | |
80 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
81 | * @size: Size of @new_entry in bytes. | |
a238cf5b | 82 | * @param: Pointer to "struct tomoyo_acl_param". |
237ab459 TH |
83 | * @check_duplicate: Callback function to find duplicated entry. |
84 | * @merge_duplicate: Callback function to merge duplicated entry. | |
85 | * | |
86 | * Returns 0 on success, negative value otherwise. | |
87 | * | |
88 | * Caller holds tomoyo_read_lock(). | |
89 | */ | |
90 | int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, | |
a238cf5b | 91 | struct tomoyo_acl_param *param, |
237ab459 TH |
92 | bool (*check_duplicate) (const struct tomoyo_acl_info |
93 | *, | |
94 | const struct tomoyo_acl_info | |
95 | *), | |
96 | bool (*merge_duplicate) (struct tomoyo_acl_info *, | |
97 | struct tomoyo_acl_info *, | |
98 | const bool)) | |
99 | { | |
a238cf5b | 100 | const bool is_delete = param->is_delete; |
237ab459 TH |
101 | int error = is_delete ? -ENOENT : -ENOMEM; |
102 | struct tomoyo_acl_info *entry; | |
a238cf5b | 103 | struct list_head * const list = param->list; |
237ab459 | 104 | |
2066a361 TH |
105 | if (param->data[0]) { |
106 | new_entry->cond = tomoyo_get_condition(param); | |
107 | if (!new_entry->cond) | |
108 | return -EINVAL; | |
6bce98ed TH |
109 | /* |
110 | * Domain transition preference is allowed for only | |
111 | * "file execute" entries. | |
112 | */ | |
113 | if (new_entry->cond->transit && | |
114 | !(new_entry->type == TOMOYO_TYPE_PATH_ACL && | |
115 | container_of(new_entry, struct tomoyo_path_acl, head) | |
116 | ->perm == 1 << TOMOYO_TYPE_EXECUTE)) | |
117 | goto out; | |
2066a361 | 118 | } |
237ab459 | 119 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
2066a361 | 120 | goto out; |
a238cf5b | 121 | list_for_each_entry_rcu(entry, list, list) { |
f9732ea1 TH |
122 | if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) |
123 | continue; | |
0df7e8b8 TH |
124 | if (!tomoyo_same_acl_head(entry, new_entry) || |
125 | !check_duplicate(entry, new_entry)) | |
237ab459 TH |
126 | continue; |
127 | if (merge_duplicate) | |
128 | entry->is_deleted = merge_duplicate(entry, new_entry, | |
129 | is_delete); | |
130 | else | |
131 | entry->is_deleted = is_delete; | |
132 | error = 0; | |
133 | break; | |
134 | } | |
135 | if (error && !is_delete) { | |
136 | entry = tomoyo_commit_ok(new_entry, size); | |
137 | if (entry) { | |
a238cf5b | 138 | list_add_tail_rcu(&entry->list, list); |
237ab459 TH |
139 | error = 0; |
140 | } | |
141 | } | |
142 | mutex_unlock(&tomoyo_policy_lock); | |
2066a361 TH |
143 | out: |
144 | tomoyo_put_condition(new_entry->cond); | |
237ab459 TH |
145 | return error; |
146 | } | |
147 | ||
32997144 TH |
148 | /** |
149 | * tomoyo_check_acl - Do permission check. | |
150 | * | |
151 | * @r: Pointer to "struct tomoyo_request_info". | |
152 | * @check_entry: Callback function to check type specific parameters. | |
153 | * | |
154 | * Returns 0 on success, negative value otherwise. | |
155 | * | |
156 | * Caller holds tomoyo_read_lock(). | |
157 | */ | |
99a85259 | 158 | void tomoyo_check_acl(struct tomoyo_request_info *r, |
484ca79c | 159 | bool (*check_entry) (struct tomoyo_request_info *, |
99a85259 TH |
160 | const struct tomoyo_acl_info *)) |
161 | { | |
162 | const struct tomoyo_domain_info *domain = r->domain; | |
163 | struct tomoyo_acl_info *ptr; | |
32997144 TH |
164 | bool retried = false; |
165 | const struct list_head *list = &domain->acl_info_list; | |
99a85259 | 166 | |
32997144 TH |
167 | retry: |
168 | list_for_each_entry_rcu(ptr, list, list) { | |
99a85259 TH |
169 | if (ptr->is_deleted || ptr->type != r->param_type) |
170 | continue; | |
2066a361 TH |
171 | if (!check_entry(r, ptr)) |
172 | continue; | |
173 | if (!tomoyo_condition(r, ptr->cond)) | |
174 | continue; | |
1f067a68 | 175 | r->matched_acl = ptr; |
2066a361 TH |
176 | r->granted = true; |
177 | return; | |
99a85259 | 178 | } |
32997144 TH |
179 | if (!retried) { |
180 | retried = true; | |
bd03a3e4 | 181 | list = &domain->ns->acl_group[domain->group]; |
32997144 TH |
182 | goto retry; |
183 | } | |
99a85259 TH |
184 | r->granted = false; |
185 | } | |
186 | ||
a230f9e7 | 187 | /* The list for "struct tomoyo_domain_info". */ |
26a2a1c9 | 188 | LIST_HEAD(tomoyo_domain_list); |
26a2a1c9 | 189 | |
26a2a1c9 | 190 | /** |
e2bf6907 | 191 | * tomoyo_last_word - Get last component of a domainname. |
26a2a1c9 | 192 | * |
bd03a3e4 | 193 | * @name: Domainname to check. |
26a2a1c9 | 194 | * |
e2bf6907 | 195 | * Returns the last word of @domainname. |
26a2a1c9 | 196 | */ |
e2bf6907 | 197 | static const char *tomoyo_last_word(const char *name) |
26a2a1c9 | 198 | { |
0f2a55d5 TH |
199 | const char *cp = strrchr(name, ' '); |
200 | if (cp) | |
201 | return cp + 1; | |
202 | return name; | |
26a2a1c9 KT |
203 | } |
204 | ||
a238cf5b TH |
205 | /** |
206 | * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry. | |
207 | * | |
208 | * @a: Pointer to "struct tomoyo_acl_head". | |
209 | * @b: Pointer to "struct tomoyo_acl_head". | |
210 | * | |
211 | * Returns true if @a == @b, false otherwise. | |
212 | */ | |
e2bf6907 TH |
213 | static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a, |
214 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 215 | { |
5448ec4f TH |
216 | const struct tomoyo_transition_control *p1 = container_of(a, |
217 | typeof(*p1), | |
218 | head); | |
219 | const struct tomoyo_transition_control *p2 = container_of(b, | |
220 | typeof(*p2), | |
221 | head); | |
222 | return p1->type == p2->type && p1->is_last_name == p2->is_last_name | |
36f5e1ff TH |
223 | && p1->domainname == p2->domainname |
224 | && p1->program == p2->program; | |
225 | } | |
226 | ||
26a2a1c9 | 227 | /** |
a238cf5b | 228 | * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list. |
26a2a1c9 | 229 | * |
a238cf5b TH |
230 | * @param: Pointer to "struct tomoyo_acl_param". |
231 | * @type: Type of this entry. | |
26a2a1c9 KT |
232 | * |
233 | * Returns 0 on success, negative value otherwise. | |
234 | */ | |
a238cf5b TH |
235 | int tomoyo_write_transition_control(struct tomoyo_acl_param *param, |
236 | const u8 type) | |
26a2a1c9 | 237 | { |
5448ec4f | 238 | struct tomoyo_transition_control e = { .type = type }; |
a238cf5b TH |
239 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
240 | char *program = param->data; | |
241 | char *domainname = strstr(program, " from "); | |
242 | if (domainname) { | |
243 | *domainname = '\0'; | |
244 | domainname += 6; | |
245 | } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP || | |
246 | type == TOMOYO_TRANSITION_CONTROL_KEEP) { | |
247 | domainname = program; | |
248 | program = NULL; | |
249 | } | |
0d2171d7 | 250 | if (program && strcmp(program, "any")) { |
5448ec4f TH |
251 | if (!tomoyo_correct_path(program)) |
252 | return -EINVAL; | |
253 | e.program = tomoyo_get_name(program); | |
254 | if (!e.program) | |
255 | goto out; | |
256 | } | |
0d2171d7 | 257 | if (domainname && strcmp(domainname, "any")) { |
5448ec4f TH |
258 | if (!tomoyo_correct_domain(domainname)) { |
259 | if (!tomoyo_correct_path(domainname)) | |
260 | goto out; | |
9e4b50e9 | 261 | e.is_last_name = true; |
5448ec4f | 262 | } |
9e4b50e9 TH |
263 | e.domainname = tomoyo_get_name(domainname); |
264 | if (!e.domainname) | |
ca0b7df3 | 265 | goto out; |
26a2a1c9 | 266 | } |
bd03a3e4 | 267 | param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; |
a238cf5b | 268 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 269 | tomoyo_same_transition_control); |
a238cf5b | 270 | out: |
9e4b50e9 TH |
271 | tomoyo_put_name(e.domainname); |
272 | tomoyo_put_name(e.program); | |
26a2a1c9 KT |
273 | return error; |
274 | } | |
275 | ||
26a2a1c9 | 276 | /** |
bd03a3e4 | 277 | * tomoyo_scan_transition - Try to find specific domain transition type. |
26a2a1c9 | 278 | * |
bd03a3e4 TH |
279 | * @list: Pointer to "struct list_head". |
280 | * @domainname: The name of current domain. | |
281 | * @program: The name of requested program. | |
282 | * @last_name: The last component of @domainname. | |
283 | * @type: One of values in "enum tomoyo_transition_type". | |
26a2a1c9 | 284 | * |
bd03a3e4 | 285 | * Returns true if found one, false otherwise. |
fdb8ebb7 TH |
286 | * |
287 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 288 | */ |
bd03a3e4 TH |
289 | static inline bool tomoyo_scan_transition |
290 | (const struct list_head *list, const struct tomoyo_path_info *domainname, | |
291 | const struct tomoyo_path_info *program, const char *last_name, | |
292 | const enum tomoyo_transition_type type) | |
26a2a1c9 | 293 | { |
5448ec4f | 294 | const struct tomoyo_transition_control *ptr; |
bd03a3e4 TH |
295 | list_for_each_entry_rcu(ptr, list, head.list) { |
296 | if (ptr->head.is_deleted || ptr->type != type) | |
297 | continue; | |
298 | if (ptr->domainname) { | |
299 | if (!ptr->is_last_name) { | |
300 | if (ptr->domainname != domainname) | |
301 | continue; | |
302 | } else { | |
5448ec4f | 303 | /* |
bd03a3e4 TH |
304 | * Use direct strcmp() since this is |
305 | * unlikely used. | |
5448ec4f | 306 | */ |
bd03a3e4 TH |
307 | if (strcmp(ptr->domainname->name, last_name)) |
308 | continue; | |
5448ec4f | 309 | } |
26a2a1c9 | 310 | } |
bd03a3e4 TH |
311 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) |
312 | continue; | |
313 | return true; | |
314 | } | |
315 | return false; | |
316 | } | |
317 | ||
318 | /** | |
319 | * tomoyo_transition_type - Get domain transition type. | |
320 | * | |
321 | * @ns: Pointer to "struct tomoyo_policy_namespace". | |
322 | * @domainname: The name of current domain. | |
323 | * @program: The name of requested program. | |
324 | * | |
325 | * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes | |
326 | * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if | |
327 | * executing @program reinitializes domain transition within that namespace, | |
328 | * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname , | |
329 | * others otherwise. | |
330 | * | |
331 | * Caller holds tomoyo_read_lock(). | |
332 | */ | |
333 | static enum tomoyo_transition_type tomoyo_transition_type | |
334 | (const struct tomoyo_policy_namespace *ns, | |
335 | const struct tomoyo_path_info *domainname, | |
336 | const struct tomoyo_path_info *program) | |
337 | { | |
338 | const char *last_name = tomoyo_last_word(domainname->name); | |
339 | enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET; | |
340 | while (type < TOMOYO_MAX_TRANSITION_TYPE) { | |
341 | const struct list_head * const list = | |
342 | &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; | |
343 | if (!tomoyo_scan_transition(list, domainname, program, | |
344 | last_name, type)) { | |
345 | type++; | |
346 | continue; | |
347 | } | |
348 | if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET && | |
349 | type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE) | |
350 | break; | |
351 | /* | |
352 | * Do not check for reset_domain if no_reset_domain matched. | |
353 | * Do not check for initialize_domain if no_initialize_domain | |
354 | * matched. | |
355 | */ | |
356 | type++; | |
357 | type++; | |
26a2a1c9 | 358 | } |
5448ec4f | 359 | return type; |
26a2a1c9 KT |
360 | } |
361 | ||
a238cf5b TH |
362 | /** |
363 | * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry. | |
364 | * | |
365 | * @a: Pointer to "struct tomoyo_acl_head". | |
366 | * @b: Pointer to "struct tomoyo_acl_head". | |
367 | * | |
368 | * Returns true if @a == @b, false otherwise. | |
369 | */ | |
e2bf6907 TH |
370 | static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a, |
371 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 372 | { |
a238cf5b TH |
373 | const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1), |
374 | head); | |
375 | const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2), | |
376 | head); | |
36f5e1ff TH |
377 | return p1->original_name == p2->original_name && |
378 | p1->aggregated_name == p2->aggregated_name; | |
379 | } | |
380 | ||
1084307c | 381 | /** |
a238cf5b | 382 | * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list. |
1084307c | 383 | * |
a238cf5b | 384 | * @param: Pointer to "struct tomoyo_acl_param". |
1084307c TH |
385 | * |
386 | * Returns 0 on success, negative value otherwise. | |
387 | * | |
388 | * Caller holds tomoyo_read_lock(). | |
389 | */ | |
a238cf5b | 390 | int tomoyo_write_aggregator(struct tomoyo_acl_param *param) |
1084307c | 391 | { |
e2bf6907 | 392 | struct tomoyo_aggregator e = { }; |
a238cf5b TH |
393 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
394 | const char *original_name = tomoyo_read_token(param); | |
395 | const char *aggregated_name = tomoyo_read_token(param); | |
396 | if (!tomoyo_correct_word(original_name) || | |
75093152 | 397 | !tomoyo_correct_path(aggregated_name)) |
1084307c TH |
398 | return -EINVAL; |
399 | e.original_name = tomoyo_get_name(original_name); | |
400 | e.aggregated_name = tomoyo_get_name(aggregated_name); | |
401 | if (!e.original_name || !e.aggregated_name || | |
402 | e.aggregated_name->is_patterned) /* No patterns allowed. */ | |
403 | goto out; | |
bd03a3e4 | 404 | param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR]; |
a238cf5b | 405 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 406 | tomoyo_same_aggregator); |
a238cf5b | 407 | out: |
1084307c TH |
408 | tomoyo_put_name(e.original_name); |
409 | tomoyo_put_name(e.aggregated_name); | |
410 | return error; | |
411 | } | |
412 | ||
26a2a1c9 | 413 | /** |
bd03a3e4 | 414 | * tomoyo_find_namespace - Find specified namespace. |
26a2a1c9 | 415 | * |
bd03a3e4 TH |
416 | * @name: Name of namespace to find. |
417 | * @len: Length of @name. | |
26a2a1c9 | 418 | * |
bd03a3e4 TH |
419 | * Returns pointer to "struct tomoyo_policy_namespace" if found, |
420 | * NULL otherwise. | |
fdb8ebb7 TH |
421 | * |
422 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 423 | */ |
bd03a3e4 TH |
424 | static struct tomoyo_policy_namespace *tomoyo_find_namespace |
425 | (const char *name, const unsigned int len) | |
26a2a1c9 | 426 | { |
bd03a3e4 TH |
427 | struct tomoyo_policy_namespace *ns; |
428 | list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { | |
429 | if (strncmp(name, ns->name, len) || | |
430 | (name[len] && name[len] != ' ')) | |
431 | continue; | |
432 | return ns; | |
433 | } | |
434 | return NULL; | |
435 | } | |
26a2a1c9 | 436 | |
bd03a3e4 TH |
437 | /** |
438 | * tomoyo_assign_namespace - Create a new namespace. | |
439 | * | |
440 | * @domainname: Name of namespace to create. | |
441 | * | |
442 | * Returns pointer to "struct tomoyo_policy_namespace" on success, | |
443 | * NULL otherwise. | |
444 | * | |
445 | * Caller holds tomoyo_read_lock(). | |
446 | */ | |
447 | struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname) | |
448 | { | |
449 | struct tomoyo_policy_namespace *ptr; | |
450 | struct tomoyo_policy_namespace *entry; | |
451 | const char *cp = domainname; | |
452 | unsigned int len = 0; | |
453 | while (*cp && *cp++ != ' ') | |
454 | len++; | |
455 | ptr = tomoyo_find_namespace(domainname, len); | |
456 | if (ptr) | |
457 | return ptr; | |
458 | if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname)) | |
ca0b7df3 | 459 | return NULL; |
bd03a3e4 TH |
460 | entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS); |
461 | if (!entry) | |
ca0b7df3 | 462 | return NULL; |
29282381 TH |
463 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
464 | goto out; | |
bd03a3e4 TH |
465 | ptr = tomoyo_find_namespace(domainname, len); |
466 | if (!ptr && tomoyo_memory_ok(entry)) { | |
467 | char *name = (char *) (entry + 1); | |
468 | ptr = entry; | |
469 | memmove(name, domainname, len); | |
470 | name[len] = '\0'; | |
471 | entry->name = name; | |
472 | tomoyo_init_policy_namespace(entry); | |
ca0b7df3 | 473 | entry = NULL; |
26a2a1c9 | 474 | } |
f737d95d | 475 | mutex_unlock(&tomoyo_policy_lock); |
bd03a3e4 | 476 | out: |
ca0b7df3 | 477 | kfree(entry); |
bd03a3e4 TH |
478 | return ptr; |
479 | } | |
480 | ||
481 | /** | |
482 | * tomoyo_namespace_jump - Check for namespace jump. | |
483 | * | |
484 | * @domainname: Name of domain. | |
485 | * | |
486 | * Returns true if namespace differs, false otherwise. | |
487 | */ | |
488 | static bool tomoyo_namespace_jump(const char *domainname) | |
489 | { | |
490 | const char *namespace = tomoyo_current_namespace()->name; | |
491 | const int len = strlen(namespace); | |
492 | return strncmp(domainname, namespace, len) || | |
493 | (domainname[len] && domainname[len] != ' '); | |
494 | } | |
495 | ||
496 | /** | |
497 | * tomoyo_assign_domain - Create a domain or a namespace. | |
498 | * | |
499 | * @domainname: The name of domain. | |
500 | * @transit: True if transit to domain found or created. | |
501 | * | |
502 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
503 | * | |
504 | * Caller holds tomoyo_read_lock(). | |
505 | */ | |
506 | struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, | |
507 | const bool transit) | |
508 | { | |
509 | struct tomoyo_domain_info e = { }; | |
510 | struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname); | |
511 | bool created = false; | |
512 | if (entry) { | |
513 | if (transit) { | |
514 | /* | |
515 | * Since namespace is created at runtime, profiles may | |
516 | * not be created by the moment the process transits to | |
517 | * that domain. Do not perform domain transition if | |
518 | * profile for that domain is not yet created. | |
519 | */ | |
e00fb3f7 TH |
520 | if (tomoyo_policy_loaded && |
521 | !entry->ns->profile_ptr[entry->profile]) | |
bd03a3e4 TH |
522 | return NULL; |
523 | } | |
524 | return entry; | |
525 | } | |
526 | /* Requested domain does not exist. */ | |
527 | /* Don't create requested domain if domainname is invalid. */ | |
528 | if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 || | |
529 | !tomoyo_correct_domain(domainname)) | |
530 | return NULL; | |
531 | /* | |
532 | * Since definition of profiles and acl_groups may differ across | |
533 | * namespaces, do not inherit "use_profile" and "use_group" settings | |
534 | * by automatically creating requested domain upon domain transition. | |
535 | */ | |
536 | if (transit && tomoyo_namespace_jump(domainname)) | |
537 | return NULL; | |
538 | e.ns = tomoyo_assign_namespace(domainname); | |
539 | if (!e.ns) | |
540 | return NULL; | |
541 | /* | |
542 | * "use_profile" and "use_group" settings for automatically created | |
543 | * domains are inherited from current domain. These are 0 for manually | |
544 | * created domains. | |
545 | */ | |
546 | if (transit) { | |
547 | const struct tomoyo_domain_info *domain = tomoyo_domain(); | |
548 | e.profile = domain->profile; | |
549 | e.group = domain->group; | |
550 | } | |
551 | e.domainname = tomoyo_get_name(domainname); | |
552 | if (!e.domainname) | |
553 | return NULL; | |
554 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
555 | goto out; | |
556 | entry = tomoyo_find_domain(domainname); | |
557 | if (!entry) { | |
558 | entry = tomoyo_commit_ok(&e, sizeof(e)); | |
559 | if (entry) { | |
560 | INIT_LIST_HEAD(&entry->acl_info_list); | |
561 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); | |
562 | created = true; | |
563 | } | |
564 | } | |
565 | mutex_unlock(&tomoyo_policy_lock); | |
566 | out: | |
567 | tomoyo_put_name(e.domainname); | |
568 | if (entry && transit) { | |
569 | if (created) { | |
570 | struct tomoyo_request_info r; | |
571 | tomoyo_init_request_info(&r, entry, | |
572 | TOMOYO_MAC_FILE_EXECUTE); | |
573 | r.granted = false; | |
574 | tomoyo_write_log(&r, "use_profile %u\n", | |
575 | entry->profile); | |
576 | tomoyo_write_log(&r, "use_group %u\n", entry->group); | |
778c4a4d | 577 | tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); |
bd03a3e4 TH |
578 | } |
579 | } | |
580 | return entry; | |
26a2a1c9 KT |
581 | } |
582 | ||
d58e0da8 TH |
583 | /** |
584 | * tomoyo_environ - Check permission for environment variable names. | |
585 | * | |
586 | * @ee: Pointer to "struct tomoyo_execve". | |
587 | * | |
588 | * Returns 0 on success, negative value otherwise. | |
589 | */ | |
590 | static int tomoyo_environ(struct tomoyo_execve *ee) | |
591 | { | |
592 | struct tomoyo_request_info *r = &ee->r; | |
593 | struct linux_binprm *bprm = ee->bprm; | |
594 | /* env_page.data is allocated by tomoyo_dump_page(). */ | |
595 | struct tomoyo_page_dump env_page = { }; | |
596 | char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */ | |
597 | int arg_len = 0; | |
598 | unsigned long pos = bprm->p; | |
599 | int offset = pos % PAGE_SIZE; | |
600 | int argv_count = bprm->argc; | |
601 | int envp_count = bprm->envc; | |
602 | int error = -ENOMEM; | |
603 | ||
604 | ee->r.type = TOMOYO_MAC_ENVIRON; | |
605 | ee->r.profile = r->domain->profile; | |
606 | ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile, | |
607 | TOMOYO_MAC_ENVIRON); | |
608 | if (!r->mode || !envp_count) | |
609 | return 0; | |
610 | arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
611 | if (!arg_ptr) | |
612 | goto out; | |
613 | while (error == -ENOMEM) { | |
614 | if (!tomoyo_dump_page(bprm, pos, &env_page)) | |
615 | goto out; | |
616 | pos += PAGE_SIZE - offset; | |
617 | /* Read. */ | |
618 | while (argv_count && offset < PAGE_SIZE) { | |
619 | if (!env_page.data[offset++]) | |
620 | argv_count--; | |
621 | } | |
622 | if (argv_count) { | |
623 | offset = 0; | |
624 | continue; | |
625 | } | |
626 | while (offset < PAGE_SIZE) { | |
627 | const unsigned char c = env_page.data[offset++]; | |
628 | ||
629 | if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) { | |
630 | if (c == '=') { | |
631 | arg_ptr[arg_len++] = '\0'; | |
632 | } else if (c == '\\') { | |
633 | arg_ptr[arg_len++] = '\\'; | |
634 | arg_ptr[arg_len++] = '\\'; | |
635 | } else if (c > ' ' && c < 127) { | |
636 | arg_ptr[arg_len++] = c; | |
637 | } else { | |
638 | arg_ptr[arg_len++] = '\\'; | |
639 | arg_ptr[arg_len++] = (c >> 6) + '0'; | |
640 | arg_ptr[arg_len++] | |
641 | = ((c >> 3) & 7) + '0'; | |
642 | arg_ptr[arg_len++] = (c & 7) + '0'; | |
643 | } | |
644 | } else { | |
645 | arg_ptr[arg_len] = '\0'; | |
646 | } | |
647 | if (c) | |
648 | continue; | |
649 | if (tomoyo_env_perm(r, arg_ptr)) { | |
650 | error = -EPERM; | |
651 | break; | |
652 | } | |
653 | if (!--envp_count) { | |
654 | error = 0; | |
655 | break; | |
656 | } | |
657 | arg_len = 0; | |
658 | } | |
659 | offset = 0; | |
660 | } | |
661 | out: | |
662 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
663 | error = 0; | |
664 | kfree(env_page.data); | |
665 | kfree(arg_ptr); | |
666 | return error; | |
667 | } | |
668 | ||
26a2a1c9 KT |
669 | /** |
670 | * tomoyo_find_next_domain - Find a domain. | |
671 | * | |
56f8c9bc | 672 | * @bprm: Pointer to "struct linux_binprm". |
26a2a1c9 KT |
673 | * |
674 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
675 | * |
676 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 677 | */ |
56f8c9bc | 678 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
26a2a1c9 | 679 | { |
26a2a1c9 KT |
680 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
681 | struct tomoyo_domain_info *domain = NULL; | |
26a2a1c9 | 682 | const char *original_name = bprm->filename; |
26a2a1c9 | 683 | int retval = -ENOMEM; |
bd03a3e4 | 684 | bool reject_on_transition_failure = false; |
a8f76409 TH |
685 | const struct tomoyo_path_info *candidate; |
686 | struct tomoyo_path_info exename; | |
97fb35e4 | 687 | struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS); |
d58e0da8 | 688 | |
97fb35e4 TH |
689 | if (!ee) |
690 | return -ENOMEM; | |
691 | ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
692 | if (!ee->tmp) { | |
693 | kfree(ee); | |
694 | return -ENOMEM; | |
695 | } | |
696 | /* ee->dump->data is allocated by tomoyo_dump_page(). */ | |
697 | tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE); | |
698 | ee->r.ee = ee; | |
699 | ee->bprm = bprm; | |
700 | ee->r.obj = &ee->obj; | |
701 | ee->obj.path1 = bprm->file->f_path; | |
0617c7ff | 702 | /* Get symlink's pathname of program. */ |
26a2a1c9 | 703 | retval = -ENOENT; |
a8f76409 TH |
704 | exename.name = tomoyo_realpath_nofollow(original_name); |
705 | if (!exename.name) | |
26a2a1c9 | 706 | goto out; |
a8f76409 TH |
707 | tomoyo_fill_path_info(&exename); |
708 | retry: | |
1084307c TH |
709 | /* Check 'aggregator' directive. */ |
710 | { | |
e2bf6907 | 711 | struct tomoyo_aggregator *ptr; |
bd03a3e4 TH |
712 | struct list_head *list = |
713 | &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR]; | |
714 | /* Check 'aggregator' directive. */ | |
a8f76409 | 715 | candidate = &exename; |
bd03a3e4 | 716 | list_for_each_entry_rcu(ptr, list, head.list) { |
82e0f001 | 717 | if (ptr->head.is_deleted || |
a8f76409 | 718 | !tomoyo_path_matches_pattern(&exename, |
1084307c TH |
719 | ptr->original_name)) |
720 | continue; | |
a8f76409 | 721 | candidate = ptr->aggregated_name; |
1084307c TH |
722 | break; |
723 | } | |
724 | } | |
725 | ||
26a2a1c9 | 726 | /* Check execute permission. */ |
6bce98ed | 727 | retval = tomoyo_execute_permission(&ee->r, candidate); |
17fcfbd9 TH |
728 | if (retval == TOMOYO_RETRY_REQUEST) |
729 | goto retry; | |
26a2a1c9 KT |
730 | if (retval < 0) |
731 | goto out; | |
484ca79c TH |
732 | /* |
733 | * To be able to specify domainnames with wildcards, use the | |
734 | * pathname specified in the policy (which may contain | |
735 | * wildcard) rather than the pathname passed to execve() | |
736 | * (which never contains wildcard). | |
737 | */ | |
a8f76409 TH |
738 | if (ee->r.param.path.matched_path) |
739 | candidate = ee->r.param.path.matched_path; | |
26a2a1c9 | 740 | |
6bce98ed TH |
741 | /* |
742 | * Check for domain transition preference if "file execute" matched. | |
743 | * If preference is given, make do_execve() fail if domain transition | |
744 | * has failed, for domain transition preference should be used with | |
745 | * destination domain defined. | |
746 | */ | |
747 | if (ee->transition) { | |
748 | const char *domainname = ee->transition->name; | |
749 | reject_on_transition_failure = true; | |
750 | if (!strcmp(domainname, "keep")) | |
751 | goto force_keep_domain; | |
752 | if (!strcmp(domainname, "child")) | |
753 | goto force_child_domain; | |
754 | if (!strcmp(domainname, "reset")) | |
755 | goto force_reset_domain; | |
756 | if (!strcmp(domainname, "initialize")) | |
757 | goto force_initialize_domain; | |
758 | if (!strcmp(domainname, "parent")) { | |
759 | char *cp; | |
760 | strncpy(ee->tmp, old_domain->domainname->name, | |
761 | TOMOYO_EXEC_TMPSIZE - 1); | |
762 | cp = strrchr(ee->tmp, ' '); | |
763 | if (cp) | |
764 | *cp = '\0'; | |
765 | } else if (*domainname == '<') | |
766 | strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1); | |
767 | else | |
768 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", | |
769 | old_domain->domainname->name, domainname); | |
770 | goto force_jump_domain; | |
771 | } | |
772 | /* | |
773 | * No domain transition preference specified. | |
774 | * Calculate domain to transit to. | |
775 | */ | |
bd03a3e4 | 776 | switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname, |
a8f76409 | 777 | candidate)) { |
bd03a3e4 | 778 | case TOMOYO_TRANSITION_CONTROL_RESET: |
6bce98ed | 779 | force_reset_domain: |
bd03a3e4 | 780 | /* Transit to the root of specified namespace. */ |
a8f76409 TH |
781 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", |
782 | candidate->name); | |
bd03a3e4 TH |
783 | /* |
784 | * Make do_execve() fail if domain transition across namespaces | |
785 | * has failed. | |
786 | */ | |
787 | reject_on_transition_failure = true; | |
788 | break; | |
5448ec4f | 789 | case TOMOYO_TRANSITION_CONTROL_INITIALIZE: |
6bce98ed | 790 | force_initialize_domain: |
bd03a3e4 | 791 | /* Transit to the child of current namespace's root. */ |
97fb35e4 | 792 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
a8f76409 | 793 | old_domain->ns->name, candidate->name); |
5448ec4f TH |
794 | break; |
795 | case TOMOYO_TRANSITION_CONTROL_KEEP: | |
6bce98ed | 796 | force_keep_domain: |
26a2a1c9 KT |
797 | /* Keep current domain. */ |
798 | domain = old_domain; | |
5448ec4f TH |
799 | break; |
800 | default: | |
801 | if (old_domain == &tomoyo_kernel_domain && | |
802 | !tomoyo_policy_loaded) { | |
803 | /* | |
804 | * Needn't to transit from kernel domain before | |
805 | * starting /sbin/init. But transit from kernel domain | |
806 | * if executing initializers because they might start | |
807 | * before /sbin/init. | |
808 | */ | |
809 | domain = old_domain; | |
a8f76409 | 810 | break; |
5448ec4f | 811 | } |
6bce98ed | 812 | force_child_domain: |
a8f76409 TH |
813 | /* Normal domain transition. */ |
814 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", | |
815 | old_domain->domainname->name, candidate->name); | |
5448ec4f | 816 | break; |
26a2a1c9 | 817 | } |
6bce98ed | 818 | force_jump_domain: |
7c75964f | 819 | if (!domain) |
97fb35e4 | 820 | domain = tomoyo_assign_domain(ee->tmp, true); |
26a2a1c9 | 821 | if (domain) |
bd03a3e4 TH |
822 | retval = 0; |
823 | else if (reject_on_transition_failure) { | |
97fb35e4 TH |
824 | printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n", |
825 | ee->tmp); | |
bd03a3e4 | 826 | retval = -ENOMEM; |
97fb35e4 | 827 | } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING) |
bd03a3e4 TH |
828 | retval = -ENOMEM; |
829 | else { | |
830 | retval = 0; | |
2c47ab93 TH |
831 | if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) { |
832 | old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true; | |
97fb35e4 TH |
833 | ee->r.granted = false; |
834 | tomoyo_write_log(&ee->r, "%s", tomoyo_dif | |
2c47ab93 | 835 | [TOMOYO_DIF_TRANSITION_FAILED]); |
bd03a3e4 | 836 | printk(KERN_WARNING |
97fb35e4 | 837 | "ERROR: Domain '%s' not defined.\n", ee->tmp); |
bd03a3e4 TH |
838 | } |
839 | } | |
26a2a1c9 | 840 | out: |
56f8c9bc TH |
841 | if (!domain) |
842 | domain = old_domain; | |
ec8e6a4e TH |
843 | /* Update reference count on "struct tomoyo_domain_info". */ |
844 | atomic_inc(&domain->users); | |
56f8c9bc | 845 | bprm->cred->security = domain; |
a8f76409 | 846 | kfree(exename.name); |
d58e0da8 TH |
847 | if (!retval) { |
848 | ee->r.domain = domain; | |
849 | retval = tomoyo_environ(ee); | |
850 | } | |
97fb35e4 TH |
851 | kfree(ee->tmp); |
852 | kfree(ee->dump.data); | |
853 | kfree(ee); | |
26a2a1c9 KT |
854 | return retval; |
855 | } | |
5b636857 TH |
856 | |
857 | /** | |
858 | * tomoyo_dump_page - Dump a page to buffer. | |
859 | * | |
860 | * @bprm: Pointer to "struct linux_binprm". | |
861 | * @pos: Location to dump. | |
862 | * @dump: Poiner to "struct tomoyo_page_dump". | |
863 | * | |
864 | * Returns true on success, false otherwise. | |
865 | */ | |
866 | bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos, | |
867 | struct tomoyo_page_dump *dump) | |
868 | { | |
869 | struct page *page; | |
d58e0da8 TH |
870 | |
871 | /* dump->data is released by tomoyo_find_next_domain(). */ | |
5b636857 TH |
872 | if (!dump->data) { |
873 | dump->data = kzalloc(PAGE_SIZE, GFP_NOFS); | |
874 | if (!dump->data) | |
875 | return false; | |
876 | } | |
877 | /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ | |
878 | #ifdef CONFIG_MMU | |
1e987790 DH |
879 | /* |
880 | * This is called at execve() time in order to dig around | |
881 | * in the argv/environment of the new proceess | |
882 | * (represented by bprm). 'current' is the process doing | |
883 | * the execve(). | |
884 | */ | |
885 | if (get_user_pages_remote(current, bprm->mm, pos, 1, | |
5b56d49f | 886 | FOLL_FORCE, &page, NULL, NULL) <= 0) |
5b636857 TH |
887 | return false; |
888 | #else | |
889 | page = bprm->page[pos / PAGE_SIZE]; | |
890 | #endif | |
891 | if (page != dump->page) { | |
892 | const unsigned int offset = pos % PAGE_SIZE; | |
893 | /* | |
894 | * Maybe kmap()/kunmap() should be used here. | |
895 | * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). | |
896 | * So do I. | |
897 | */ | |
c58e0377 | 898 | char *kaddr = kmap_atomic(page); |
d58e0da8 | 899 | |
5b636857 TH |
900 | dump->page = page; |
901 | memcpy(dump->data + offset, kaddr + offset, | |
902 | PAGE_SIZE - offset); | |
c58e0377 | 903 | kunmap_atomic(kaddr); |
5b636857 TH |
904 | } |
905 | /* Same with put_arg_page(page) in fs/exec.c */ | |
906 | #ifdef CONFIG_MMU | |
907 | put_page(page); | |
908 | #endif | |
909 | return true; | |
910 | } |