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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
26a2a1c9 KT |
2 | /* |
3 | * security/tomoyo/domain.c | |
4 | * | |
0f2a55d5 | 5 | * Copyright (C) 2005-2011 NTT DATA CORPORATION |
26a2a1c9 KT |
6 | */ |
7 | ||
8 | #include "common.h" | |
b2d09103 | 9 | |
26a2a1c9 | 10 | #include <linux/binfmts.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
b2d09103 | 12 | #include <linux/rculist.h> |
26a2a1c9 KT |
13 | |
14 | /* Variables definitions.*/ | |
15 | ||
16 | /* The initial domain. */ | |
17 | struct tomoyo_domain_info tomoyo_kernel_domain; | |
18 | ||
36f5e1ff TH |
19 | /** |
20 | * tomoyo_update_policy - Update an entry for exception policy. | |
21 | * | |
22 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
23 | * @size: Size of @new_entry in bytes. | |
a238cf5b | 24 | * @param: Pointer to "struct tomoyo_acl_param". |
36f5e1ff TH |
25 | * @check_duplicate: Callback function to find duplicated entry. |
26 | * | |
27 | * Returns 0 on success, negative value otherwise. | |
28 | * | |
29 | * Caller holds tomoyo_read_lock(). | |
30 | */ | |
31 | int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size, | |
a238cf5b | 32 | struct tomoyo_acl_param *param, |
36f5e1ff TH |
33 | bool (*check_duplicate) (const struct tomoyo_acl_head |
34 | *, | |
35 | const struct tomoyo_acl_head | |
36 | *)) | |
37 | { | |
a238cf5b | 38 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
36f5e1ff | 39 | struct tomoyo_acl_head *entry; |
a238cf5b | 40 | struct list_head *list = param->list; |
36f5e1ff TH |
41 | |
42 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
43 | return -ENOMEM; | |
44 | list_for_each_entry_rcu(entry, list, list) { | |
f9732ea1 TH |
45 | if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) |
46 | continue; | |
36f5e1ff TH |
47 | if (!check_duplicate(entry, new_entry)) |
48 | continue; | |
a238cf5b | 49 | entry->is_deleted = param->is_delete; |
36f5e1ff TH |
50 | error = 0; |
51 | break; | |
52 | } | |
a238cf5b | 53 | if (error && !param->is_delete) { |
36f5e1ff TH |
54 | entry = tomoyo_commit_ok(new_entry, size); |
55 | if (entry) { | |
56 | list_add_tail_rcu(&entry->list, list); | |
57 | error = 0; | |
58 | } | |
59 | } | |
60 | mutex_unlock(&tomoyo_policy_lock); | |
61 | return error; | |
62 | } | |
63 | ||
0df7e8b8 TH |
64 | /** |
65 | * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry. | |
66 | * | |
67 | * @a: Pointer to "struct tomoyo_acl_info". | |
68 | * @b: Pointer to "struct tomoyo_acl_info". | |
69 | * | |
70 | * Returns true if @a == @b, false otherwise. | |
71 | */ | |
72 | static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a, | |
73 | const struct tomoyo_acl_info *b) | |
74 | { | |
2066a361 | 75 | return a->type == b->type && a->cond == b->cond; |
0df7e8b8 TH |
76 | } |
77 | ||
237ab459 TH |
78 | /** |
79 | * tomoyo_update_domain - Update an entry for domain policy. | |
80 | * | |
81 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
82 | * @size: Size of @new_entry in bytes. | |
a238cf5b | 83 | * @param: Pointer to "struct tomoyo_acl_param". |
237ab459 TH |
84 | * @check_duplicate: Callback function to find duplicated entry. |
85 | * @merge_duplicate: Callback function to merge duplicated entry. | |
86 | * | |
87 | * Returns 0 on success, negative value otherwise. | |
88 | * | |
89 | * Caller holds tomoyo_read_lock(). | |
90 | */ | |
91 | int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, | |
a238cf5b | 92 | struct tomoyo_acl_param *param, |
237ab459 TH |
93 | bool (*check_duplicate) (const struct tomoyo_acl_info |
94 | *, | |
95 | const struct tomoyo_acl_info | |
96 | *), | |
97 | bool (*merge_duplicate) (struct tomoyo_acl_info *, | |
98 | struct tomoyo_acl_info *, | |
99 | const bool)) | |
100 | { | |
a238cf5b | 101 | const bool is_delete = param->is_delete; |
237ab459 TH |
102 | int error = is_delete ? -ENOENT : -ENOMEM; |
103 | struct tomoyo_acl_info *entry; | |
a238cf5b | 104 | struct list_head * const list = param->list; |
237ab459 | 105 | |
2066a361 TH |
106 | if (param->data[0]) { |
107 | new_entry->cond = tomoyo_get_condition(param); | |
108 | if (!new_entry->cond) | |
109 | return -EINVAL; | |
6bce98ed TH |
110 | /* |
111 | * Domain transition preference is allowed for only | |
112 | * "file execute" entries. | |
113 | */ | |
114 | if (new_entry->cond->transit && | |
115 | !(new_entry->type == TOMOYO_TYPE_PATH_ACL && | |
116 | container_of(new_entry, struct tomoyo_path_acl, head) | |
117 | ->perm == 1 << TOMOYO_TYPE_EXECUTE)) | |
118 | goto out; | |
2066a361 | 119 | } |
237ab459 | 120 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
2066a361 | 121 | goto out; |
a238cf5b | 122 | list_for_each_entry_rcu(entry, list, list) { |
f9732ea1 TH |
123 | if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) |
124 | continue; | |
0df7e8b8 TH |
125 | if (!tomoyo_same_acl_head(entry, new_entry) || |
126 | !check_duplicate(entry, new_entry)) | |
237ab459 TH |
127 | continue; |
128 | if (merge_duplicate) | |
129 | entry->is_deleted = merge_duplicate(entry, new_entry, | |
130 | is_delete); | |
131 | else | |
132 | entry->is_deleted = is_delete; | |
133 | error = 0; | |
134 | break; | |
135 | } | |
136 | if (error && !is_delete) { | |
137 | entry = tomoyo_commit_ok(new_entry, size); | |
138 | if (entry) { | |
a238cf5b | 139 | list_add_tail_rcu(&entry->list, list); |
237ab459 TH |
140 | error = 0; |
141 | } | |
142 | } | |
143 | mutex_unlock(&tomoyo_policy_lock); | |
2066a361 TH |
144 | out: |
145 | tomoyo_put_condition(new_entry->cond); | |
237ab459 TH |
146 | return error; |
147 | } | |
148 | ||
32997144 TH |
149 | /** |
150 | * tomoyo_check_acl - Do permission check. | |
151 | * | |
152 | * @r: Pointer to "struct tomoyo_request_info". | |
153 | * @check_entry: Callback function to check type specific parameters. | |
154 | * | |
155 | * Returns 0 on success, negative value otherwise. | |
156 | * | |
157 | * Caller holds tomoyo_read_lock(). | |
158 | */ | |
99a85259 | 159 | void tomoyo_check_acl(struct tomoyo_request_info *r, |
484ca79c | 160 | bool (*check_entry) (struct tomoyo_request_info *, |
99a85259 TH |
161 | const struct tomoyo_acl_info *)) |
162 | { | |
163 | const struct tomoyo_domain_info *domain = r->domain; | |
164 | struct tomoyo_acl_info *ptr; | |
32997144 TH |
165 | bool retried = false; |
166 | const struct list_head *list = &domain->acl_info_list; | |
99a85259 | 167 | |
32997144 TH |
168 | retry: |
169 | list_for_each_entry_rcu(ptr, list, list) { | |
99a85259 TH |
170 | if (ptr->is_deleted || ptr->type != r->param_type) |
171 | continue; | |
2066a361 TH |
172 | if (!check_entry(r, ptr)) |
173 | continue; | |
174 | if (!tomoyo_condition(r, ptr->cond)) | |
175 | continue; | |
1f067a68 | 176 | r->matched_acl = ptr; |
2066a361 TH |
177 | r->granted = true; |
178 | return; | |
99a85259 | 179 | } |
32997144 TH |
180 | if (!retried) { |
181 | retried = true; | |
bd03a3e4 | 182 | list = &domain->ns->acl_group[domain->group]; |
32997144 TH |
183 | goto retry; |
184 | } | |
99a85259 TH |
185 | r->granted = false; |
186 | } | |
187 | ||
a230f9e7 | 188 | /* The list for "struct tomoyo_domain_info". */ |
26a2a1c9 | 189 | LIST_HEAD(tomoyo_domain_list); |
26a2a1c9 | 190 | |
26a2a1c9 | 191 | /** |
e2bf6907 | 192 | * tomoyo_last_word - Get last component of a domainname. |
26a2a1c9 | 193 | * |
bd03a3e4 | 194 | * @name: Domainname to check. |
26a2a1c9 | 195 | * |
e2bf6907 | 196 | * Returns the last word of @domainname. |
26a2a1c9 | 197 | */ |
e2bf6907 | 198 | static const char *tomoyo_last_word(const char *name) |
26a2a1c9 | 199 | { |
0f2a55d5 TH |
200 | const char *cp = strrchr(name, ' '); |
201 | if (cp) | |
202 | return cp + 1; | |
203 | return name; | |
26a2a1c9 KT |
204 | } |
205 | ||
a238cf5b TH |
206 | /** |
207 | * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry. | |
208 | * | |
209 | * @a: Pointer to "struct tomoyo_acl_head". | |
210 | * @b: Pointer to "struct tomoyo_acl_head". | |
211 | * | |
212 | * Returns true if @a == @b, false otherwise. | |
213 | */ | |
e2bf6907 TH |
214 | static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a, |
215 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 216 | { |
5448ec4f TH |
217 | const struct tomoyo_transition_control *p1 = container_of(a, |
218 | typeof(*p1), | |
219 | head); | |
220 | const struct tomoyo_transition_control *p2 = container_of(b, | |
221 | typeof(*p2), | |
222 | head); | |
223 | return p1->type == p2->type && p1->is_last_name == p2->is_last_name | |
36f5e1ff TH |
224 | && p1->domainname == p2->domainname |
225 | && p1->program == p2->program; | |
226 | } | |
227 | ||
26a2a1c9 | 228 | /** |
a238cf5b | 229 | * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list. |
26a2a1c9 | 230 | * |
a238cf5b TH |
231 | * @param: Pointer to "struct tomoyo_acl_param". |
232 | * @type: Type of this entry. | |
26a2a1c9 KT |
233 | * |
234 | * Returns 0 on success, negative value otherwise. | |
235 | */ | |
a238cf5b TH |
236 | int tomoyo_write_transition_control(struct tomoyo_acl_param *param, |
237 | const u8 type) | |
26a2a1c9 | 238 | { |
5448ec4f | 239 | struct tomoyo_transition_control e = { .type = type }; |
a238cf5b TH |
240 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
241 | char *program = param->data; | |
242 | char *domainname = strstr(program, " from "); | |
243 | if (domainname) { | |
244 | *domainname = '\0'; | |
245 | domainname += 6; | |
246 | } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP || | |
247 | type == TOMOYO_TRANSITION_CONTROL_KEEP) { | |
248 | domainname = program; | |
249 | program = NULL; | |
250 | } | |
0d2171d7 | 251 | if (program && strcmp(program, "any")) { |
5448ec4f TH |
252 | if (!tomoyo_correct_path(program)) |
253 | return -EINVAL; | |
254 | e.program = tomoyo_get_name(program); | |
255 | if (!e.program) | |
256 | goto out; | |
257 | } | |
0d2171d7 | 258 | if (domainname && strcmp(domainname, "any")) { |
5448ec4f TH |
259 | if (!tomoyo_correct_domain(domainname)) { |
260 | if (!tomoyo_correct_path(domainname)) | |
261 | goto out; | |
9e4b50e9 | 262 | e.is_last_name = true; |
5448ec4f | 263 | } |
9e4b50e9 TH |
264 | e.domainname = tomoyo_get_name(domainname); |
265 | if (!e.domainname) | |
ca0b7df3 | 266 | goto out; |
26a2a1c9 | 267 | } |
bd03a3e4 | 268 | param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; |
a238cf5b | 269 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 270 | tomoyo_same_transition_control); |
a238cf5b | 271 | out: |
9e4b50e9 TH |
272 | tomoyo_put_name(e.domainname); |
273 | tomoyo_put_name(e.program); | |
26a2a1c9 KT |
274 | return error; |
275 | } | |
276 | ||
26a2a1c9 | 277 | /** |
bd03a3e4 | 278 | * tomoyo_scan_transition - Try to find specific domain transition type. |
26a2a1c9 | 279 | * |
bd03a3e4 TH |
280 | * @list: Pointer to "struct list_head". |
281 | * @domainname: The name of current domain. | |
282 | * @program: The name of requested program. | |
283 | * @last_name: The last component of @domainname. | |
284 | * @type: One of values in "enum tomoyo_transition_type". | |
26a2a1c9 | 285 | * |
bd03a3e4 | 286 | * Returns true if found one, false otherwise. |
fdb8ebb7 TH |
287 | * |
288 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 289 | */ |
bd03a3e4 TH |
290 | static inline bool tomoyo_scan_transition |
291 | (const struct list_head *list, const struct tomoyo_path_info *domainname, | |
292 | const struct tomoyo_path_info *program, const char *last_name, | |
293 | const enum tomoyo_transition_type type) | |
26a2a1c9 | 294 | { |
5448ec4f | 295 | const struct tomoyo_transition_control *ptr; |
bd03a3e4 TH |
296 | list_for_each_entry_rcu(ptr, list, head.list) { |
297 | if (ptr->head.is_deleted || ptr->type != type) | |
298 | continue; | |
299 | if (ptr->domainname) { | |
300 | if (!ptr->is_last_name) { | |
301 | if (ptr->domainname != domainname) | |
302 | continue; | |
303 | } else { | |
5448ec4f | 304 | /* |
bd03a3e4 TH |
305 | * Use direct strcmp() since this is |
306 | * unlikely used. | |
5448ec4f | 307 | */ |
bd03a3e4 TH |
308 | if (strcmp(ptr->domainname->name, last_name)) |
309 | continue; | |
5448ec4f | 310 | } |
26a2a1c9 | 311 | } |
bd03a3e4 TH |
312 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) |
313 | continue; | |
314 | return true; | |
315 | } | |
316 | return false; | |
317 | } | |
318 | ||
319 | /** | |
320 | * tomoyo_transition_type - Get domain transition type. | |
321 | * | |
322 | * @ns: Pointer to "struct tomoyo_policy_namespace". | |
323 | * @domainname: The name of current domain. | |
324 | * @program: The name of requested program. | |
325 | * | |
326 | * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes | |
327 | * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if | |
328 | * executing @program reinitializes domain transition within that namespace, | |
329 | * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname , | |
330 | * others otherwise. | |
331 | * | |
332 | * Caller holds tomoyo_read_lock(). | |
333 | */ | |
334 | static enum tomoyo_transition_type tomoyo_transition_type | |
335 | (const struct tomoyo_policy_namespace *ns, | |
336 | const struct tomoyo_path_info *domainname, | |
337 | const struct tomoyo_path_info *program) | |
338 | { | |
339 | const char *last_name = tomoyo_last_word(domainname->name); | |
340 | enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET; | |
341 | while (type < TOMOYO_MAX_TRANSITION_TYPE) { | |
342 | const struct list_head * const list = | |
343 | &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; | |
344 | if (!tomoyo_scan_transition(list, domainname, program, | |
345 | last_name, type)) { | |
346 | type++; | |
347 | continue; | |
348 | } | |
349 | if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET && | |
350 | type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE) | |
351 | break; | |
352 | /* | |
353 | * Do not check for reset_domain if no_reset_domain matched. | |
354 | * Do not check for initialize_domain if no_initialize_domain | |
355 | * matched. | |
356 | */ | |
357 | type++; | |
358 | type++; | |
26a2a1c9 | 359 | } |
5448ec4f | 360 | return type; |
26a2a1c9 KT |
361 | } |
362 | ||
a238cf5b TH |
363 | /** |
364 | * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry. | |
365 | * | |
366 | * @a: Pointer to "struct tomoyo_acl_head". | |
367 | * @b: Pointer to "struct tomoyo_acl_head". | |
368 | * | |
369 | * Returns true if @a == @b, false otherwise. | |
370 | */ | |
e2bf6907 TH |
371 | static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a, |
372 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 373 | { |
a238cf5b TH |
374 | const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1), |
375 | head); | |
376 | const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2), | |
377 | head); | |
36f5e1ff TH |
378 | return p1->original_name == p2->original_name && |
379 | p1->aggregated_name == p2->aggregated_name; | |
380 | } | |
381 | ||
1084307c | 382 | /** |
a238cf5b | 383 | * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list. |
1084307c | 384 | * |
a238cf5b | 385 | * @param: Pointer to "struct tomoyo_acl_param". |
1084307c TH |
386 | * |
387 | * Returns 0 on success, negative value otherwise. | |
388 | * | |
389 | * Caller holds tomoyo_read_lock(). | |
390 | */ | |
a238cf5b | 391 | int tomoyo_write_aggregator(struct tomoyo_acl_param *param) |
1084307c | 392 | { |
e2bf6907 | 393 | struct tomoyo_aggregator e = { }; |
a238cf5b TH |
394 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
395 | const char *original_name = tomoyo_read_token(param); | |
396 | const char *aggregated_name = tomoyo_read_token(param); | |
397 | if (!tomoyo_correct_word(original_name) || | |
75093152 | 398 | !tomoyo_correct_path(aggregated_name)) |
1084307c TH |
399 | return -EINVAL; |
400 | e.original_name = tomoyo_get_name(original_name); | |
401 | e.aggregated_name = tomoyo_get_name(aggregated_name); | |
402 | if (!e.original_name || !e.aggregated_name || | |
403 | e.aggregated_name->is_patterned) /* No patterns allowed. */ | |
404 | goto out; | |
bd03a3e4 | 405 | param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR]; |
a238cf5b | 406 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 407 | tomoyo_same_aggregator); |
a238cf5b | 408 | out: |
1084307c TH |
409 | tomoyo_put_name(e.original_name); |
410 | tomoyo_put_name(e.aggregated_name); | |
411 | return error; | |
412 | } | |
413 | ||
26a2a1c9 | 414 | /** |
bd03a3e4 | 415 | * tomoyo_find_namespace - Find specified namespace. |
26a2a1c9 | 416 | * |
bd03a3e4 TH |
417 | * @name: Name of namespace to find. |
418 | * @len: Length of @name. | |
26a2a1c9 | 419 | * |
bd03a3e4 TH |
420 | * Returns pointer to "struct tomoyo_policy_namespace" if found, |
421 | * NULL otherwise. | |
fdb8ebb7 TH |
422 | * |
423 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 424 | */ |
bd03a3e4 TH |
425 | static struct tomoyo_policy_namespace *tomoyo_find_namespace |
426 | (const char *name, const unsigned int len) | |
26a2a1c9 | 427 | { |
bd03a3e4 TH |
428 | struct tomoyo_policy_namespace *ns; |
429 | list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { | |
430 | if (strncmp(name, ns->name, len) || | |
431 | (name[len] && name[len] != ' ')) | |
432 | continue; | |
433 | return ns; | |
434 | } | |
435 | return NULL; | |
436 | } | |
26a2a1c9 | 437 | |
bd03a3e4 TH |
438 | /** |
439 | * tomoyo_assign_namespace - Create a new namespace. | |
440 | * | |
441 | * @domainname: Name of namespace to create. | |
442 | * | |
443 | * Returns pointer to "struct tomoyo_policy_namespace" on success, | |
444 | * NULL otherwise. | |
445 | * | |
446 | * Caller holds tomoyo_read_lock(). | |
447 | */ | |
448 | struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname) | |
449 | { | |
450 | struct tomoyo_policy_namespace *ptr; | |
451 | struct tomoyo_policy_namespace *entry; | |
452 | const char *cp = domainname; | |
453 | unsigned int len = 0; | |
454 | while (*cp && *cp++ != ' ') | |
455 | len++; | |
456 | ptr = tomoyo_find_namespace(domainname, len); | |
457 | if (ptr) | |
458 | return ptr; | |
459 | if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname)) | |
ca0b7df3 | 460 | return NULL; |
bd03a3e4 TH |
461 | entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS); |
462 | if (!entry) | |
ca0b7df3 | 463 | return NULL; |
29282381 TH |
464 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
465 | goto out; | |
bd03a3e4 TH |
466 | ptr = tomoyo_find_namespace(domainname, len); |
467 | if (!ptr && tomoyo_memory_ok(entry)) { | |
468 | char *name = (char *) (entry + 1); | |
469 | ptr = entry; | |
470 | memmove(name, domainname, len); | |
471 | name[len] = '\0'; | |
472 | entry->name = name; | |
473 | tomoyo_init_policy_namespace(entry); | |
ca0b7df3 | 474 | entry = NULL; |
26a2a1c9 | 475 | } |
f737d95d | 476 | mutex_unlock(&tomoyo_policy_lock); |
bd03a3e4 | 477 | out: |
ca0b7df3 | 478 | kfree(entry); |
bd03a3e4 TH |
479 | return ptr; |
480 | } | |
481 | ||
482 | /** | |
483 | * tomoyo_namespace_jump - Check for namespace jump. | |
484 | * | |
485 | * @domainname: Name of domain. | |
486 | * | |
487 | * Returns true if namespace differs, false otherwise. | |
488 | */ | |
489 | static bool tomoyo_namespace_jump(const char *domainname) | |
490 | { | |
491 | const char *namespace = tomoyo_current_namespace()->name; | |
492 | const int len = strlen(namespace); | |
493 | return strncmp(domainname, namespace, len) || | |
494 | (domainname[len] && domainname[len] != ' '); | |
495 | } | |
496 | ||
497 | /** | |
498 | * tomoyo_assign_domain - Create a domain or a namespace. | |
499 | * | |
500 | * @domainname: The name of domain. | |
501 | * @transit: True if transit to domain found or created. | |
502 | * | |
503 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
504 | * | |
505 | * Caller holds tomoyo_read_lock(). | |
506 | */ | |
507 | struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, | |
508 | const bool transit) | |
509 | { | |
510 | struct tomoyo_domain_info e = { }; | |
511 | struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname); | |
512 | bool created = false; | |
513 | if (entry) { | |
514 | if (transit) { | |
515 | /* | |
516 | * Since namespace is created at runtime, profiles may | |
517 | * not be created by the moment the process transits to | |
518 | * that domain. Do not perform domain transition if | |
519 | * profile for that domain is not yet created. | |
520 | */ | |
e00fb3f7 TH |
521 | if (tomoyo_policy_loaded && |
522 | !entry->ns->profile_ptr[entry->profile]) | |
bd03a3e4 TH |
523 | return NULL; |
524 | } | |
525 | return entry; | |
526 | } | |
527 | /* Requested domain does not exist. */ | |
528 | /* Don't create requested domain if domainname is invalid. */ | |
529 | if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 || | |
530 | !tomoyo_correct_domain(domainname)) | |
531 | return NULL; | |
532 | /* | |
533 | * Since definition of profiles and acl_groups may differ across | |
534 | * namespaces, do not inherit "use_profile" and "use_group" settings | |
535 | * by automatically creating requested domain upon domain transition. | |
536 | */ | |
537 | if (transit && tomoyo_namespace_jump(domainname)) | |
538 | return NULL; | |
539 | e.ns = tomoyo_assign_namespace(domainname); | |
540 | if (!e.ns) | |
541 | return NULL; | |
542 | /* | |
543 | * "use_profile" and "use_group" settings for automatically created | |
544 | * domains are inherited from current domain. These are 0 for manually | |
545 | * created domains. | |
546 | */ | |
547 | if (transit) { | |
548 | const struct tomoyo_domain_info *domain = tomoyo_domain(); | |
549 | e.profile = domain->profile; | |
550 | e.group = domain->group; | |
551 | } | |
552 | e.domainname = tomoyo_get_name(domainname); | |
553 | if (!e.domainname) | |
554 | return NULL; | |
555 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
556 | goto out; | |
557 | entry = tomoyo_find_domain(domainname); | |
558 | if (!entry) { | |
559 | entry = tomoyo_commit_ok(&e, sizeof(e)); | |
560 | if (entry) { | |
561 | INIT_LIST_HEAD(&entry->acl_info_list); | |
562 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); | |
563 | created = true; | |
564 | } | |
565 | } | |
566 | mutex_unlock(&tomoyo_policy_lock); | |
567 | out: | |
568 | tomoyo_put_name(e.domainname); | |
569 | if (entry && transit) { | |
570 | if (created) { | |
571 | struct tomoyo_request_info r; | |
572 | tomoyo_init_request_info(&r, entry, | |
573 | TOMOYO_MAC_FILE_EXECUTE); | |
574 | r.granted = false; | |
575 | tomoyo_write_log(&r, "use_profile %u\n", | |
576 | entry->profile); | |
577 | tomoyo_write_log(&r, "use_group %u\n", entry->group); | |
778c4a4d | 578 | tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); |
bd03a3e4 TH |
579 | } |
580 | } | |
581 | return entry; | |
26a2a1c9 KT |
582 | } |
583 | ||
d58e0da8 TH |
584 | /** |
585 | * tomoyo_environ - Check permission for environment variable names. | |
586 | * | |
587 | * @ee: Pointer to "struct tomoyo_execve". | |
588 | * | |
589 | * Returns 0 on success, negative value otherwise. | |
590 | */ | |
591 | static int tomoyo_environ(struct tomoyo_execve *ee) | |
592 | { | |
593 | struct tomoyo_request_info *r = &ee->r; | |
594 | struct linux_binprm *bprm = ee->bprm; | |
595 | /* env_page.data is allocated by tomoyo_dump_page(). */ | |
596 | struct tomoyo_page_dump env_page = { }; | |
597 | char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */ | |
598 | int arg_len = 0; | |
599 | unsigned long pos = bprm->p; | |
600 | int offset = pos % PAGE_SIZE; | |
601 | int argv_count = bprm->argc; | |
602 | int envp_count = bprm->envc; | |
603 | int error = -ENOMEM; | |
604 | ||
605 | ee->r.type = TOMOYO_MAC_ENVIRON; | |
606 | ee->r.profile = r->domain->profile; | |
607 | ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile, | |
608 | TOMOYO_MAC_ENVIRON); | |
609 | if (!r->mode || !envp_count) | |
610 | return 0; | |
611 | arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
612 | if (!arg_ptr) | |
613 | goto out; | |
614 | while (error == -ENOMEM) { | |
615 | if (!tomoyo_dump_page(bprm, pos, &env_page)) | |
616 | goto out; | |
617 | pos += PAGE_SIZE - offset; | |
618 | /* Read. */ | |
619 | while (argv_count && offset < PAGE_SIZE) { | |
620 | if (!env_page.data[offset++]) | |
621 | argv_count--; | |
622 | } | |
623 | if (argv_count) { | |
624 | offset = 0; | |
625 | continue; | |
626 | } | |
627 | while (offset < PAGE_SIZE) { | |
628 | const unsigned char c = env_page.data[offset++]; | |
629 | ||
630 | if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) { | |
631 | if (c == '=') { | |
632 | arg_ptr[arg_len++] = '\0'; | |
633 | } else if (c == '\\') { | |
634 | arg_ptr[arg_len++] = '\\'; | |
635 | arg_ptr[arg_len++] = '\\'; | |
636 | } else if (c > ' ' && c < 127) { | |
637 | arg_ptr[arg_len++] = c; | |
638 | } else { | |
639 | arg_ptr[arg_len++] = '\\'; | |
640 | arg_ptr[arg_len++] = (c >> 6) + '0'; | |
641 | arg_ptr[arg_len++] | |
642 | = ((c >> 3) & 7) + '0'; | |
643 | arg_ptr[arg_len++] = (c & 7) + '0'; | |
644 | } | |
645 | } else { | |
646 | arg_ptr[arg_len] = '\0'; | |
647 | } | |
648 | if (c) | |
649 | continue; | |
650 | if (tomoyo_env_perm(r, arg_ptr)) { | |
651 | error = -EPERM; | |
652 | break; | |
653 | } | |
654 | if (!--envp_count) { | |
655 | error = 0; | |
656 | break; | |
657 | } | |
658 | arg_len = 0; | |
659 | } | |
660 | offset = 0; | |
661 | } | |
662 | out: | |
663 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
664 | error = 0; | |
665 | kfree(env_page.data); | |
666 | kfree(arg_ptr); | |
667 | return error; | |
668 | } | |
669 | ||
26a2a1c9 KT |
670 | /** |
671 | * tomoyo_find_next_domain - Find a domain. | |
672 | * | |
56f8c9bc | 673 | * @bprm: Pointer to "struct linux_binprm". |
26a2a1c9 KT |
674 | * |
675 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
676 | * |
677 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 678 | */ |
56f8c9bc | 679 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
26a2a1c9 | 680 | { |
26a2a1c9 KT |
681 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
682 | struct tomoyo_domain_info *domain = NULL; | |
26a2a1c9 | 683 | const char *original_name = bprm->filename; |
26a2a1c9 | 684 | int retval = -ENOMEM; |
bd03a3e4 | 685 | bool reject_on_transition_failure = false; |
a8f76409 TH |
686 | const struct tomoyo_path_info *candidate; |
687 | struct tomoyo_path_info exename; | |
97fb35e4 | 688 | struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS); |
d58e0da8 | 689 | |
97fb35e4 TH |
690 | if (!ee) |
691 | return -ENOMEM; | |
692 | ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
693 | if (!ee->tmp) { | |
694 | kfree(ee); | |
695 | return -ENOMEM; | |
696 | } | |
697 | /* ee->dump->data is allocated by tomoyo_dump_page(). */ | |
698 | tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE); | |
699 | ee->r.ee = ee; | |
700 | ee->bprm = bprm; | |
701 | ee->r.obj = &ee->obj; | |
702 | ee->obj.path1 = bprm->file->f_path; | |
0617c7ff | 703 | /* Get symlink's pathname of program. */ |
26a2a1c9 | 704 | retval = -ENOENT; |
a8f76409 TH |
705 | exename.name = tomoyo_realpath_nofollow(original_name); |
706 | if (!exename.name) | |
26a2a1c9 | 707 | goto out; |
a8f76409 TH |
708 | tomoyo_fill_path_info(&exename); |
709 | retry: | |
1084307c TH |
710 | /* Check 'aggregator' directive. */ |
711 | { | |
e2bf6907 | 712 | struct tomoyo_aggregator *ptr; |
bd03a3e4 TH |
713 | struct list_head *list = |
714 | &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR]; | |
715 | /* Check 'aggregator' directive. */ | |
a8f76409 | 716 | candidate = &exename; |
bd03a3e4 | 717 | list_for_each_entry_rcu(ptr, list, head.list) { |
82e0f001 | 718 | if (ptr->head.is_deleted || |
a8f76409 | 719 | !tomoyo_path_matches_pattern(&exename, |
1084307c TH |
720 | ptr->original_name)) |
721 | continue; | |
a8f76409 | 722 | candidate = ptr->aggregated_name; |
1084307c TH |
723 | break; |
724 | } | |
725 | } | |
726 | ||
26a2a1c9 | 727 | /* Check execute permission. */ |
6bce98ed | 728 | retval = tomoyo_execute_permission(&ee->r, candidate); |
17fcfbd9 TH |
729 | if (retval == TOMOYO_RETRY_REQUEST) |
730 | goto retry; | |
26a2a1c9 KT |
731 | if (retval < 0) |
732 | goto out; | |
484ca79c TH |
733 | /* |
734 | * To be able to specify domainnames with wildcards, use the | |
735 | * pathname specified in the policy (which may contain | |
736 | * wildcard) rather than the pathname passed to execve() | |
737 | * (which never contains wildcard). | |
738 | */ | |
a8f76409 TH |
739 | if (ee->r.param.path.matched_path) |
740 | candidate = ee->r.param.path.matched_path; | |
26a2a1c9 | 741 | |
6bce98ed TH |
742 | /* |
743 | * Check for domain transition preference if "file execute" matched. | |
744 | * If preference is given, make do_execve() fail if domain transition | |
745 | * has failed, for domain transition preference should be used with | |
746 | * destination domain defined. | |
747 | */ | |
748 | if (ee->transition) { | |
749 | const char *domainname = ee->transition->name; | |
750 | reject_on_transition_failure = true; | |
751 | if (!strcmp(domainname, "keep")) | |
752 | goto force_keep_domain; | |
753 | if (!strcmp(domainname, "child")) | |
754 | goto force_child_domain; | |
755 | if (!strcmp(domainname, "reset")) | |
756 | goto force_reset_domain; | |
757 | if (!strcmp(domainname, "initialize")) | |
758 | goto force_initialize_domain; | |
759 | if (!strcmp(domainname, "parent")) { | |
760 | char *cp; | |
761 | strncpy(ee->tmp, old_domain->domainname->name, | |
762 | TOMOYO_EXEC_TMPSIZE - 1); | |
763 | cp = strrchr(ee->tmp, ' '); | |
764 | if (cp) | |
765 | *cp = '\0'; | |
766 | } else if (*domainname == '<') | |
767 | strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1); | |
768 | else | |
769 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", | |
770 | old_domain->domainname->name, domainname); | |
771 | goto force_jump_domain; | |
772 | } | |
773 | /* | |
774 | * No domain transition preference specified. | |
775 | * Calculate domain to transit to. | |
776 | */ | |
bd03a3e4 | 777 | switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname, |
a8f76409 | 778 | candidate)) { |
bd03a3e4 | 779 | case TOMOYO_TRANSITION_CONTROL_RESET: |
6bce98ed | 780 | force_reset_domain: |
bd03a3e4 | 781 | /* Transit to the root of specified namespace. */ |
a8f76409 TH |
782 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", |
783 | candidate->name); | |
bd03a3e4 TH |
784 | /* |
785 | * Make do_execve() fail if domain transition across namespaces | |
786 | * has failed. | |
787 | */ | |
788 | reject_on_transition_failure = true; | |
789 | break; | |
5448ec4f | 790 | case TOMOYO_TRANSITION_CONTROL_INITIALIZE: |
6bce98ed | 791 | force_initialize_domain: |
bd03a3e4 | 792 | /* Transit to the child of current namespace's root. */ |
97fb35e4 | 793 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
a8f76409 | 794 | old_domain->ns->name, candidate->name); |
5448ec4f TH |
795 | break; |
796 | case TOMOYO_TRANSITION_CONTROL_KEEP: | |
6bce98ed | 797 | force_keep_domain: |
26a2a1c9 KT |
798 | /* Keep current domain. */ |
799 | domain = old_domain; | |
5448ec4f TH |
800 | break; |
801 | default: | |
802 | if (old_domain == &tomoyo_kernel_domain && | |
803 | !tomoyo_policy_loaded) { | |
804 | /* | |
805 | * Needn't to transit from kernel domain before | |
806 | * starting /sbin/init. But transit from kernel domain | |
807 | * if executing initializers because they might start | |
808 | * before /sbin/init. | |
809 | */ | |
810 | domain = old_domain; | |
a8f76409 | 811 | break; |
5448ec4f | 812 | } |
6bce98ed | 813 | force_child_domain: |
a8f76409 TH |
814 | /* Normal domain transition. */ |
815 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", | |
816 | old_domain->domainname->name, candidate->name); | |
5448ec4f | 817 | break; |
26a2a1c9 | 818 | } |
6bce98ed | 819 | force_jump_domain: |
7c75964f | 820 | if (!domain) |
97fb35e4 | 821 | domain = tomoyo_assign_domain(ee->tmp, true); |
26a2a1c9 | 822 | if (domain) |
bd03a3e4 TH |
823 | retval = 0; |
824 | else if (reject_on_transition_failure) { | |
97fb35e4 TH |
825 | printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n", |
826 | ee->tmp); | |
bd03a3e4 | 827 | retval = -ENOMEM; |
97fb35e4 | 828 | } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING) |
bd03a3e4 TH |
829 | retval = -ENOMEM; |
830 | else { | |
831 | retval = 0; | |
2c47ab93 TH |
832 | if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) { |
833 | old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true; | |
97fb35e4 TH |
834 | ee->r.granted = false; |
835 | tomoyo_write_log(&ee->r, "%s", tomoyo_dif | |
2c47ab93 | 836 | [TOMOYO_DIF_TRANSITION_FAILED]); |
bd03a3e4 | 837 | printk(KERN_WARNING |
97fb35e4 | 838 | "ERROR: Domain '%s' not defined.\n", ee->tmp); |
bd03a3e4 TH |
839 | } |
840 | } | |
26a2a1c9 | 841 | out: |
56f8c9bc TH |
842 | if (!domain) |
843 | domain = old_domain; | |
ec8e6a4e TH |
844 | /* Update reference count on "struct tomoyo_domain_info". */ |
845 | atomic_inc(&domain->users); | |
56f8c9bc | 846 | bprm->cred->security = domain; |
a8f76409 | 847 | kfree(exename.name); |
d58e0da8 TH |
848 | if (!retval) { |
849 | ee->r.domain = domain; | |
850 | retval = tomoyo_environ(ee); | |
851 | } | |
97fb35e4 TH |
852 | kfree(ee->tmp); |
853 | kfree(ee->dump.data); | |
854 | kfree(ee); | |
26a2a1c9 KT |
855 | return retval; |
856 | } | |
5b636857 TH |
857 | |
858 | /** | |
859 | * tomoyo_dump_page - Dump a page to buffer. | |
860 | * | |
861 | * @bprm: Pointer to "struct linux_binprm". | |
862 | * @pos: Location to dump. | |
863 | * @dump: Poiner to "struct tomoyo_page_dump". | |
864 | * | |
865 | * Returns true on success, false otherwise. | |
866 | */ | |
867 | bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos, | |
868 | struct tomoyo_page_dump *dump) | |
869 | { | |
870 | struct page *page; | |
d58e0da8 TH |
871 | |
872 | /* dump->data is released by tomoyo_find_next_domain(). */ | |
5b636857 TH |
873 | if (!dump->data) { |
874 | dump->data = kzalloc(PAGE_SIZE, GFP_NOFS); | |
875 | if (!dump->data) | |
876 | return false; | |
877 | } | |
878 | /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ | |
879 | #ifdef CONFIG_MMU | |
1e987790 DH |
880 | /* |
881 | * This is called at execve() time in order to dig around | |
882 | * in the argv/environment of the new proceess | |
883 | * (represented by bprm). 'current' is the process doing | |
884 | * the execve(). | |
885 | */ | |
886 | if (get_user_pages_remote(current, bprm->mm, pos, 1, | |
5b56d49f | 887 | FOLL_FORCE, &page, NULL, NULL) <= 0) |
5b636857 TH |
888 | return false; |
889 | #else | |
890 | page = bprm->page[pos / PAGE_SIZE]; | |
891 | #endif | |
892 | if (page != dump->page) { | |
893 | const unsigned int offset = pos % PAGE_SIZE; | |
894 | /* | |
895 | * Maybe kmap()/kunmap() should be used here. | |
896 | * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). | |
897 | * So do I. | |
898 | */ | |
c58e0377 | 899 | char *kaddr = kmap_atomic(page); |
d58e0da8 | 900 | |
5b636857 TH |
901 | dump->page = page; |
902 | memcpy(dump->data + offset, kaddr + offset, | |
903 | PAGE_SIZE - offset); | |
c58e0377 | 904 | kunmap_atomic(kaddr); |
5b636857 TH |
905 | } |
906 | /* Same with put_arg_page(page) in fs/exec.c */ | |
907 | #ifdef CONFIG_MMU | |
908 | put_page(page); | |
909 | #endif | |
910 | return true; | |
911 | } |