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, |
cdcf6723 TH |
33 | bool (*check_duplicate)(const struct tomoyo_acl_head |
34 | *, | |
35 | const struct tomoyo_acl_head | |
36 | *)) | |
36f5e1ff | 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; | |
6bd5ce60 TH |
44 | list_for_each_entry_rcu(entry, list, list, |
45 | srcu_read_lock_held(&tomoyo_ss)) { | |
f9732ea1 TH |
46 | if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) |
47 | continue; | |
36f5e1ff TH |
48 | if (!check_duplicate(entry, new_entry)) |
49 | continue; | |
a238cf5b | 50 | entry->is_deleted = param->is_delete; |
36f5e1ff TH |
51 | error = 0; |
52 | break; | |
53 | } | |
a238cf5b | 54 | if (error && !param->is_delete) { |
36f5e1ff TH |
55 | entry = tomoyo_commit_ok(new_entry, size); |
56 | if (entry) { | |
57 | list_add_tail_rcu(&entry->list, list); | |
58 | error = 0; | |
59 | } | |
60 | } | |
61 | mutex_unlock(&tomoyo_policy_lock); | |
62 | return error; | |
63 | } | |
64 | ||
0df7e8b8 TH |
65 | /** |
66 | * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry. | |
67 | * | |
68 | * @a: Pointer to "struct tomoyo_acl_info". | |
69 | * @b: Pointer to "struct tomoyo_acl_info". | |
70 | * | |
71 | * Returns true if @a == @b, false otherwise. | |
72 | */ | |
73 | static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a, | |
74 | const struct tomoyo_acl_info *b) | |
75 | { | |
2066a361 | 76 | return a->type == b->type && a->cond == b->cond; |
0df7e8b8 TH |
77 | } |
78 | ||
237ab459 TH |
79 | /** |
80 | * tomoyo_update_domain - Update an entry for domain policy. | |
81 | * | |
82 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
83 | * @size: Size of @new_entry in bytes. | |
a238cf5b | 84 | * @param: Pointer to "struct tomoyo_acl_param". |
237ab459 TH |
85 | * @check_duplicate: Callback function to find duplicated entry. |
86 | * @merge_duplicate: Callback function to merge duplicated entry. | |
87 | * | |
88 | * Returns 0 on success, negative value otherwise. | |
89 | * | |
90 | * Caller holds tomoyo_read_lock(). | |
91 | */ | |
92 | int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, | |
a238cf5b | 93 | struct tomoyo_acl_param *param, |
cdcf6723 TH |
94 | bool (*check_duplicate)(const struct tomoyo_acl_info |
95 | *, | |
96 | const struct tomoyo_acl_info | |
97 | *), | |
98 | bool (*merge_duplicate)(struct tomoyo_acl_info *, | |
99 | struct tomoyo_acl_info *, | |
100 | const bool)) | |
237ab459 | 101 | { |
a238cf5b | 102 | const bool is_delete = param->is_delete; |
237ab459 TH |
103 | int error = is_delete ? -ENOENT : -ENOMEM; |
104 | struct tomoyo_acl_info *entry; | |
a238cf5b | 105 | struct list_head * const list = param->list; |
237ab459 | 106 | |
2066a361 TH |
107 | if (param->data[0]) { |
108 | new_entry->cond = tomoyo_get_condition(param); | |
109 | if (!new_entry->cond) | |
110 | return -EINVAL; | |
6bce98ed TH |
111 | /* |
112 | * Domain transition preference is allowed for only | |
113 | * "file execute" entries. | |
114 | */ | |
115 | if (new_entry->cond->transit && | |
116 | !(new_entry->type == TOMOYO_TYPE_PATH_ACL && | |
117 | container_of(new_entry, struct tomoyo_path_acl, head) | |
118 | ->perm == 1 << TOMOYO_TYPE_EXECUTE)) | |
119 | goto out; | |
2066a361 | 120 | } |
237ab459 | 121 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
2066a361 | 122 | goto out; |
6bd5ce60 TH |
123 | list_for_each_entry_rcu(entry, list, list, |
124 | srcu_read_lock_held(&tomoyo_ss)) { | |
f9732ea1 TH |
125 | if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS) |
126 | continue; | |
0df7e8b8 TH |
127 | if (!tomoyo_same_acl_head(entry, new_entry) || |
128 | !check_duplicate(entry, new_entry)) | |
237ab459 TH |
129 | continue; |
130 | if (merge_duplicate) | |
131 | entry->is_deleted = merge_duplicate(entry, new_entry, | |
132 | is_delete); | |
133 | else | |
134 | entry->is_deleted = is_delete; | |
135 | error = 0; | |
136 | break; | |
137 | } | |
138 | if (error && !is_delete) { | |
139 | entry = tomoyo_commit_ok(new_entry, size); | |
140 | if (entry) { | |
a238cf5b | 141 | list_add_tail_rcu(&entry->list, list); |
237ab459 TH |
142 | error = 0; |
143 | } | |
144 | } | |
145 | mutex_unlock(&tomoyo_policy_lock); | |
2066a361 TH |
146 | out: |
147 | tomoyo_put_condition(new_entry->cond); | |
237ab459 TH |
148 | return error; |
149 | } | |
150 | ||
32997144 TH |
151 | /** |
152 | * tomoyo_check_acl - Do permission check. | |
153 | * | |
154 | * @r: Pointer to "struct tomoyo_request_info". | |
155 | * @check_entry: Callback function to check type specific parameters. | |
156 | * | |
157 | * Returns 0 on success, negative value otherwise. | |
158 | * | |
159 | * Caller holds tomoyo_read_lock(). | |
160 | */ | |
99a85259 | 161 | void tomoyo_check_acl(struct tomoyo_request_info *r, |
cdcf6723 TH |
162 | bool (*check_entry)(struct tomoyo_request_info *, |
163 | const struct tomoyo_acl_info *)) | |
99a85259 TH |
164 | { |
165 | const struct tomoyo_domain_info *domain = r->domain; | |
166 | struct tomoyo_acl_info *ptr; | |
32997144 | 167 | const struct list_head *list = &domain->acl_info_list; |
4b425641 | 168 | u16 i = 0; |
99a85259 | 169 | |
32997144 | 170 | retry: |
6bd5ce60 TH |
171 | list_for_each_entry_rcu(ptr, list, list, |
172 | srcu_read_lock_held(&tomoyo_ss)) { | |
99a85259 TH |
173 | if (ptr->is_deleted || ptr->type != r->param_type) |
174 | continue; | |
2066a361 TH |
175 | if (!check_entry(r, ptr)) |
176 | continue; | |
177 | if (!tomoyo_condition(r, ptr->cond)) | |
178 | continue; | |
1f067a68 | 179 | r->matched_acl = ptr; |
2066a361 TH |
180 | r->granted = true; |
181 | return; | |
99a85259 | 182 | } |
4b425641 TH |
183 | for (; i < TOMOYO_MAX_ACL_GROUPS; i++) { |
184 | if (!test_bit(i, domain->group)) | |
185 | continue; | |
186 | list = &domain->ns->acl_group[i++]; | |
32997144 TH |
187 | goto retry; |
188 | } | |
99a85259 TH |
189 | r->granted = false; |
190 | } | |
191 | ||
a230f9e7 | 192 | /* The list for "struct tomoyo_domain_info". */ |
26a2a1c9 | 193 | LIST_HEAD(tomoyo_domain_list); |
26a2a1c9 | 194 | |
26a2a1c9 | 195 | /** |
e2bf6907 | 196 | * tomoyo_last_word - Get last component of a domainname. |
26a2a1c9 | 197 | * |
bd03a3e4 | 198 | * @name: Domainname to check. |
26a2a1c9 | 199 | * |
e2bf6907 | 200 | * Returns the last word of @domainname. |
26a2a1c9 | 201 | */ |
e2bf6907 | 202 | static const char *tomoyo_last_word(const char *name) |
26a2a1c9 | 203 | { |
0f2a55d5 | 204 | const char *cp = strrchr(name, ' '); |
cdcf6723 | 205 | |
0f2a55d5 TH |
206 | if (cp) |
207 | return cp + 1; | |
208 | return name; | |
26a2a1c9 KT |
209 | } |
210 | ||
a238cf5b TH |
211 | /** |
212 | * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry. | |
213 | * | |
214 | * @a: Pointer to "struct tomoyo_acl_head". | |
215 | * @b: Pointer to "struct tomoyo_acl_head". | |
216 | * | |
217 | * Returns true if @a == @b, false otherwise. | |
218 | */ | |
e2bf6907 TH |
219 | static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a, |
220 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 221 | { |
5448ec4f TH |
222 | const struct tomoyo_transition_control *p1 = container_of(a, |
223 | typeof(*p1), | |
224 | head); | |
225 | const struct tomoyo_transition_control *p2 = container_of(b, | |
226 | typeof(*p2), | |
227 | head); | |
cdcf6723 | 228 | |
5448ec4f | 229 | return p1->type == p2->type && p1->is_last_name == p2->is_last_name |
36f5e1ff TH |
230 | && p1->domainname == p2->domainname |
231 | && p1->program == p2->program; | |
232 | } | |
233 | ||
26a2a1c9 | 234 | /** |
a238cf5b | 235 | * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list. |
26a2a1c9 | 236 | * |
a238cf5b TH |
237 | * @param: Pointer to "struct tomoyo_acl_param". |
238 | * @type: Type of this entry. | |
26a2a1c9 KT |
239 | * |
240 | * Returns 0 on success, negative value otherwise. | |
241 | */ | |
a238cf5b TH |
242 | int tomoyo_write_transition_control(struct tomoyo_acl_param *param, |
243 | const u8 type) | |
26a2a1c9 | 244 | { |
5448ec4f | 245 | struct tomoyo_transition_control e = { .type = type }; |
a238cf5b TH |
246 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
247 | char *program = param->data; | |
248 | char *domainname = strstr(program, " from "); | |
cdcf6723 | 249 | |
a238cf5b TH |
250 | if (domainname) { |
251 | *domainname = '\0'; | |
252 | domainname += 6; | |
253 | } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP || | |
254 | type == TOMOYO_TRANSITION_CONTROL_KEEP) { | |
255 | domainname = program; | |
256 | program = NULL; | |
257 | } | |
0d2171d7 | 258 | if (program && strcmp(program, "any")) { |
5448ec4f TH |
259 | if (!tomoyo_correct_path(program)) |
260 | return -EINVAL; | |
261 | e.program = tomoyo_get_name(program); | |
262 | if (!e.program) | |
263 | goto out; | |
264 | } | |
0d2171d7 | 265 | if (domainname && strcmp(domainname, "any")) { |
5448ec4f TH |
266 | if (!tomoyo_correct_domain(domainname)) { |
267 | if (!tomoyo_correct_path(domainname)) | |
268 | goto out; | |
9e4b50e9 | 269 | e.is_last_name = true; |
5448ec4f | 270 | } |
9e4b50e9 TH |
271 | e.domainname = tomoyo_get_name(domainname); |
272 | if (!e.domainname) | |
ca0b7df3 | 273 | goto out; |
26a2a1c9 | 274 | } |
bd03a3e4 | 275 | param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; |
a238cf5b | 276 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 277 | tomoyo_same_transition_control); |
a238cf5b | 278 | out: |
9e4b50e9 TH |
279 | tomoyo_put_name(e.domainname); |
280 | tomoyo_put_name(e.program); | |
26a2a1c9 KT |
281 | return error; |
282 | } | |
283 | ||
26a2a1c9 | 284 | /** |
bd03a3e4 | 285 | * tomoyo_scan_transition - Try to find specific domain transition type. |
26a2a1c9 | 286 | * |
bd03a3e4 TH |
287 | * @list: Pointer to "struct list_head". |
288 | * @domainname: The name of current domain. | |
289 | * @program: The name of requested program. | |
290 | * @last_name: The last component of @domainname. | |
291 | * @type: One of values in "enum tomoyo_transition_type". | |
26a2a1c9 | 292 | * |
bd03a3e4 | 293 | * Returns true if found one, false otherwise. |
fdb8ebb7 TH |
294 | * |
295 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 296 | */ |
bd03a3e4 TH |
297 | static inline bool tomoyo_scan_transition |
298 | (const struct list_head *list, const struct tomoyo_path_info *domainname, | |
299 | const struct tomoyo_path_info *program, const char *last_name, | |
300 | const enum tomoyo_transition_type type) | |
26a2a1c9 | 301 | { |
5448ec4f | 302 | const struct tomoyo_transition_control *ptr; |
cdcf6723 | 303 | |
6bd5ce60 TH |
304 | list_for_each_entry_rcu(ptr, list, head.list, |
305 | srcu_read_lock_held(&tomoyo_ss)) { | |
bd03a3e4 TH |
306 | if (ptr->head.is_deleted || ptr->type != type) |
307 | continue; | |
308 | if (ptr->domainname) { | |
309 | if (!ptr->is_last_name) { | |
310 | if (ptr->domainname != domainname) | |
311 | continue; | |
312 | } else { | |
5448ec4f | 313 | /* |
bd03a3e4 TH |
314 | * Use direct strcmp() since this is |
315 | * unlikely used. | |
5448ec4f | 316 | */ |
bd03a3e4 TH |
317 | if (strcmp(ptr->domainname->name, last_name)) |
318 | continue; | |
5448ec4f | 319 | } |
26a2a1c9 | 320 | } |
bd03a3e4 TH |
321 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) |
322 | continue; | |
323 | return true; | |
324 | } | |
325 | return false; | |
326 | } | |
327 | ||
328 | /** | |
329 | * tomoyo_transition_type - Get domain transition type. | |
330 | * | |
331 | * @ns: Pointer to "struct tomoyo_policy_namespace". | |
332 | * @domainname: The name of current domain. | |
333 | * @program: The name of requested program. | |
334 | * | |
335 | * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes | |
336 | * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if | |
337 | * executing @program reinitializes domain transition within that namespace, | |
338 | * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname , | |
339 | * others otherwise. | |
340 | * | |
341 | * Caller holds tomoyo_read_lock(). | |
342 | */ | |
343 | static enum tomoyo_transition_type tomoyo_transition_type | |
344 | (const struct tomoyo_policy_namespace *ns, | |
345 | const struct tomoyo_path_info *domainname, | |
346 | const struct tomoyo_path_info *program) | |
347 | { | |
348 | const char *last_name = tomoyo_last_word(domainname->name); | |
349 | enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET; | |
cdcf6723 | 350 | |
bd03a3e4 TH |
351 | while (type < TOMOYO_MAX_TRANSITION_TYPE) { |
352 | const struct list_head * const list = | |
353 | &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; | |
cdcf6723 | 354 | |
bd03a3e4 TH |
355 | if (!tomoyo_scan_transition(list, domainname, program, |
356 | last_name, type)) { | |
357 | type++; | |
358 | continue; | |
359 | } | |
360 | if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET && | |
361 | type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE) | |
362 | break; | |
363 | /* | |
364 | * Do not check for reset_domain if no_reset_domain matched. | |
365 | * Do not check for initialize_domain if no_initialize_domain | |
366 | * matched. | |
367 | */ | |
368 | type++; | |
369 | type++; | |
26a2a1c9 | 370 | } |
5448ec4f | 371 | return type; |
26a2a1c9 KT |
372 | } |
373 | ||
a238cf5b TH |
374 | /** |
375 | * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry. | |
376 | * | |
377 | * @a: Pointer to "struct tomoyo_acl_head". | |
378 | * @b: Pointer to "struct tomoyo_acl_head". | |
379 | * | |
380 | * Returns true if @a == @b, false otherwise. | |
381 | */ | |
e2bf6907 TH |
382 | static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a, |
383 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 384 | { |
a238cf5b TH |
385 | const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1), |
386 | head); | |
387 | const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2), | |
388 | head); | |
cdcf6723 | 389 | |
36f5e1ff TH |
390 | return p1->original_name == p2->original_name && |
391 | p1->aggregated_name == p2->aggregated_name; | |
392 | } | |
393 | ||
1084307c | 394 | /** |
a238cf5b | 395 | * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list. |
1084307c | 396 | * |
a238cf5b | 397 | * @param: Pointer to "struct tomoyo_acl_param". |
1084307c TH |
398 | * |
399 | * Returns 0 on success, negative value otherwise. | |
400 | * | |
401 | * Caller holds tomoyo_read_lock(). | |
402 | */ | |
a238cf5b | 403 | int tomoyo_write_aggregator(struct tomoyo_acl_param *param) |
1084307c | 404 | { |
e2bf6907 | 405 | struct tomoyo_aggregator e = { }; |
a238cf5b TH |
406 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
407 | const char *original_name = tomoyo_read_token(param); | |
408 | const char *aggregated_name = tomoyo_read_token(param); | |
cdcf6723 | 409 | |
a238cf5b | 410 | if (!tomoyo_correct_word(original_name) || |
75093152 | 411 | !tomoyo_correct_path(aggregated_name)) |
1084307c TH |
412 | return -EINVAL; |
413 | e.original_name = tomoyo_get_name(original_name); | |
414 | e.aggregated_name = tomoyo_get_name(aggregated_name); | |
415 | if (!e.original_name || !e.aggregated_name || | |
416 | e.aggregated_name->is_patterned) /* No patterns allowed. */ | |
417 | goto out; | |
bd03a3e4 | 418 | param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR]; |
a238cf5b | 419 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 420 | tomoyo_same_aggregator); |
a238cf5b | 421 | out: |
1084307c TH |
422 | tomoyo_put_name(e.original_name); |
423 | tomoyo_put_name(e.aggregated_name); | |
424 | return error; | |
425 | } | |
426 | ||
26a2a1c9 | 427 | /** |
bd03a3e4 | 428 | * tomoyo_find_namespace - Find specified namespace. |
26a2a1c9 | 429 | * |
bd03a3e4 TH |
430 | * @name: Name of namespace to find. |
431 | * @len: Length of @name. | |
26a2a1c9 | 432 | * |
bd03a3e4 TH |
433 | * Returns pointer to "struct tomoyo_policy_namespace" if found, |
434 | * NULL otherwise. | |
fdb8ebb7 TH |
435 | * |
436 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 437 | */ |
bd03a3e4 TH |
438 | static struct tomoyo_policy_namespace *tomoyo_find_namespace |
439 | (const char *name, const unsigned int len) | |
26a2a1c9 | 440 | { |
bd03a3e4 | 441 | struct tomoyo_policy_namespace *ns; |
cdcf6723 | 442 | |
bd03a3e4 TH |
443 | list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { |
444 | if (strncmp(name, ns->name, len) || | |
445 | (name[len] && name[len] != ' ')) | |
446 | continue; | |
447 | return ns; | |
448 | } | |
449 | return NULL; | |
450 | } | |
26a2a1c9 | 451 | |
bd03a3e4 TH |
452 | /** |
453 | * tomoyo_assign_namespace - Create a new namespace. | |
454 | * | |
455 | * @domainname: Name of namespace to create. | |
456 | * | |
457 | * Returns pointer to "struct tomoyo_policy_namespace" on success, | |
458 | * NULL otherwise. | |
459 | * | |
460 | * Caller holds tomoyo_read_lock(). | |
461 | */ | |
462 | struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname) | |
463 | { | |
464 | struct tomoyo_policy_namespace *ptr; | |
465 | struct tomoyo_policy_namespace *entry; | |
466 | const char *cp = domainname; | |
467 | unsigned int len = 0; | |
cdcf6723 | 468 | |
bd03a3e4 TH |
469 | while (*cp && *cp++ != ' ') |
470 | len++; | |
471 | ptr = tomoyo_find_namespace(domainname, len); | |
472 | if (ptr) | |
473 | return ptr; | |
474 | if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname)) | |
ca0b7df3 | 475 | return NULL; |
bd03a3e4 TH |
476 | entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS); |
477 | if (!entry) | |
ca0b7df3 | 478 | return NULL; |
29282381 TH |
479 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
480 | goto out; | |
bd03a3e4 TH |
481 | ptr = tomoyo_find_namespace(domainname, len); |
482 | if (!ptr && tomoyo_memory_ok(entry)) { | |
483 | char *name = (char *) (entry + 1); | |
cdcf6723 | 484 | |
bd03a3e4 TH |
485 | ptr = entry; |
486 | memmove(name, domainname, len); | |
487 | name[len] = '\0'; | |
488 | entry->name = name; | |
489 | tomoyo_init_policy_namespace(entry); | |
ca0b7df3 | 490 | entry = NULL; |
26a2a1c9 | 491 | } |
f737d95d | 492 | mutex_unlock(&tomoyo_policy_lock); |
bd03a3e4 | 493 | out: |
ca0b7df3 | 494 | kfree(entry); |
bd03a3e4 TH |
495 | return ptr; |
496 | } | |
497 | ||
498 | /** | |
499 | * tomoyo_namespace_jump - Check for namespace jump. | |
500 | * | |
501 | * @domainname: Name of domain. | |
502 | * | |
503 | * Returns true if namespace differs, false otherwise. | |
504 | */ | |
505 | static bool tomoyo_namespace_jump(const char *domainname) | |
506 | { | |
507 | const char *namespace = tomoyo_current_namespace()->name; | |
508 | const int len = strlen(namespace); | |
cdcf6723 | 509 | |
bd03a3e4 TH |
510 | return strncmp(domainname, namespace, len) || |
511 | (domainname[len] && domainname[len] != ' '); | |
512 | } | |
513 | ||
514 | /** | |
515 | * tomoyo_assign_domain - Create a domain or a namespace. | |
516 | * | |
517 | * @domainname: The name of domain. | |
518 | * @transit: True if transit to domain found or created. | |
519 | * | |
520 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
521 | * | |
522 | * Caller holds tomoyo_read_lock(). | |
523 | */ | |
524 | struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, | |
525 | const bool transit) | |
526 | { | |
527 | struct tomoyo_domain_info e = { }; | |
528 | struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname); | |
529 | bool created = false; | |
cdcf6723 | 530 | |
bd03a3e4 TH |
531 | if (entry) { |
532 | if (transit) { | |
533 | /* | |
534 | * Since namespace is created at runtime, profiles may | |
535 | * not be created by the moment the process transits to | |
536 | * that domain. Do not perform domain transition if | |
537 | * profile for that domain is not yet created. | |
538 | */ | |
e00fb3f7 TH |
539 | if (tomoyo_policy_loaded && |
540 | !entry->ns->profile_ptr[entry->profile]) | |
bd03a3e4 TH |
541 | return NULL; |
542 | } | |
543 | return entry; | |
544 | } | |
545 | /* Requested domain does not exist. */ | |
546 | /* Don't create requested domain if domainname is invalid. */ | |
547 | if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 || | |
548 | !tomoyo_correct_domain(domainname)) | |
549 | return NULL; | |
550 | /* | |
551 | * Since definition of profiles and acl_groups may differ across | |
552 | * namespaces, do not inherit "use_profile" and "use_group" settings | |
553 | * by automatically creating requested domain upon domain transition. | |
554 | */ | |
555 | if (transit && tomoyo_namespace_jump(domainname)) | |
556 | return NULL; | |
557 | e.ns = tomoyo_assign_namespace(domainname); | |
558 | if (!e.ns) | |
559 | return NULL; | |
560 | /* | |
561 | * "use_profile" and "use_group" settings for automatically created | |
562 | * domains are inherited from current domain. These are 0 for manually | |
563 | * created domains. | |
564 | */ | |
565 | if (transit) { | |
566 | const struct tomoyo_domain_info *domain = tomoyo_domain(); | |
cdcf6723 | 567 | |
bd03a3e4 | 568 | e.profile = domain->profile; |
4b425641 | 569 | memcpy(e.group, domain->group, sizeof(e.group)); |
bd03a3e4 TH |
570 | } |
571 | e.domainname = tomoyo_get_name(domainname); | |
572 | if (!e.domainname) | |
573 | return NULL; | |
574 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
575 | goto out; | |
576 | entry = tomoyo_find_domain(domainname); | |
577 | if (!entry) { | |
578 | entry = tomoyo_commit_ok(&e, sizeof(e)); | |
579 | if (entry) { | |
580 | INIT_LIST_HEAD(&entry->acl_info_list); | |
581 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); | |
582 | created = true; | |
583 | } | |
584 | } | |
585 | mutex_unlock(&tomoyo_policy_lock); | |
586 | out: | |
587 | tomoyo_put_name(e.domainname); | |
588 | if (entry && transit) { | |
589 | if (created) { | |
590 | struct tomoyo_request_info r; | |
4b425641 | 591 | int i; |
cdcf6723 | 592 | |
bd03a3e4 TH |
593 | tomoyo_init_request_info(&r, entry, |
594 | TOMOYO_MAC_FILE_EXECUTE); | |
595 | r.granted = false; | |
596 | tomoyo_write_log(&r, "use_profile %u\n", | |
597 | entry->profile); | |
4b425641 TH |
598 | for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++) |
599 | if (test_bit(i, entry->group)) | |
600 | tomoyo_write_log(&r, "use_group %u\n", | |
601 | i); | |
778c4a4d | 602 | tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); |
bd03a3e4 TH |
603 | } |
604 | } | |
605 | return entry; | |
26a2a1c9 KT |
606 | } |
607 | ||
d58e0da8 TH |
608 | /** |
609 | * tomoyo_environ - Check permission for environment variable names. | |
610 | * | |
611 | * @ee: Pointer to "struct tomoyo_execve". | |
612 | * | |
613 | * Returns 0 on success, negative value otherwise. | |
614 | */ | |
615 | static int tomoyo_environ(struct tomoyo_execve *ee) | |
616 | { | |
617 | struct tomoyo_request_info *r = &ee->r; | |
618 | struct linux_binprm *bprm = ee->bprm; | |
619 | /* env_page.data is allocated by tomoyo_dump_page(). */ | |
620 | struct tomoyo_page_dump env_page = { }; | |
621 | char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */ | |
622 | int arg_len = 0; | |
623 | unsigned long pos = bprm->p; | |
624 | int offset = pos % PAGE_SIZE; | |
625 | int argv_count = bprm->argc; | |
626 | int envp_count = bprm->envc; | |
627 | int error = -ENOMEM; | |
628 | ||
629 | ee->r.type = TOMOYO_MAC_ENVIRON; | |
630 | ee->r.profile = r->domain->profile; | |
631 | ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile, | |
632 | TOMOYO_MAC_ENVIRON); | |
633 | if (!r->mode || !envp_count) | |
634 | return 0; | |
635 | arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
636 | if (!arg_ptr) | |
637 | goto out; | |
638 | while (error == -ENOMEM) { | |
639 | if (!tomoyo_dump_page(bprm, pos, &env_page)) | |
640 | goto out; | |
641 | pos += PAGE_SIZE - offset; | |
642 | /* Read. */ | |
643 | while (argv_count && offset < PAGE_SIZE) { | |
644 | if (!env_page.data[offset++]) | |
645 | argv_count--; | |
646 | } | |
647 | if (argv_count) { | |
648 | offset = 0; | |
649 | continue; | |
650 | } | |
651 | while (offset < PAGE_SIZE) { | |
652 | const unsigned char c = env_page.data[offset++]; | |
653 | ||
654 | if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) { | |
655 | if (c == '=') { | |
656 | arg_ptr[arg_len++] = '\0'; | |
657 | } else if (c == '\\') { | |
658 | arg_ptr[arg_len++] = '\\'; | |
659 | arg_ptr[arg_len++] = '\\'; | |
660 | } else if (c > ' ' && c < 127) { | |
661 | arg_ptr[arg_len++] = c; | |
662 | } else { | |
663 | arg_ptr[arg_len++] = '\\'; | |
664 | arg_ptr[arg_len++] = (c >> 6) + '0'; | |
665 | arg_ptr[arg_len++] | |
666 | = ((c >> 3) & 7) + '0'; | |
667 | arg_ptr[arg_len++] = (c & 7) + '0'; | |
668 | } | |
669 | } else { | |
670 | arg_ptr[arg_len] = '\0'; | |
671 | } | |
672 | if (c) | |
673 | continue; | |
674 | if (tomoyo_env_perm(r, arg_ptr)) { | |
675 | error = -EPERM; | |
676 | break; | |
677 | } | |
678 | if (!--envp_count) { | |
679 | error = 0; | |
680 | break; | |
681 | } | |
682 | arg_len = 0; | |
683 | } | |
684 | offset = 0; | |
685 | } | |
686 | out: | |
687 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
688 | error = 0; | |
689 | kfree(env_page.data); | |
690 | kfree(arg_ptr); | |
691 | return error; | |
692 | } | |
693 | ||
26a2a1c9 KT |
694 | /** |
695 | * tomoyo_find_next_domain - Find a domain. | |
696 | * | |
56f8c9bc | 697 | * @bprm: Pointer to "struct linux_binprm". |
26a2a1c9 KT |
698 | * |
699 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
700 | * |
701 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 702 | */ |
56f8c9bc | 703 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
26a2a1c9 | 704 | { |
26a2a1c9 KT |
705 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
706 | struct tomoyo_domain_info *domain = NULL; | |
26a2a1c9 | 707 | const char *original_name = bprm->filename; |
26a2a1c9 | 708 | int retval = -ENOMEM; |
bd03a3e4 | 709 | bool reject_on_transition_failure = false; |
a8f76409 TH |
710 | const struct tomoyo_path_info *candidate; |
711 | struct tomoyo_path_info exename; | |
97fb35e4 | 712 | struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS); |
d58e0da8 | 713 | |
97fb35e4 TH |
714 | if (!ee) |
715 | return -ENOMEM; | |
716 | ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
717 | if (!ee->tmp) { | |
718 | kfree(ee); | |
719 | return -ENOMEM; | |
720 | } | |
721 | /* ee->dump->data is allocated by tomoyo_dump_page(). */ | |
722 | tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE); | |
723 | ee->r.ee = ee; | |
724 | ee->bprm = bprm; | |
725 | ee->r.obj = &ee->obj; | |
726 | ee->obj.path1 = bprm->file->f_path; | |
0617c7ff | 727 | /* Get symlink's pathname of program. */ |
26a2a1c9 | 728 | retval = -ENOENT; |
a8f76409 TH |
729 | exename.name = tomoyo_realpath_nofollow(original_name); |
730 | if (!exename.name) | |
26a2a1c9 | 731 | goto out; |
a8f76409 TH |
732 | tomoyo_fill_path_info(&exename); |
733 | retry: | |
1084307c TH |
734 | /* Check 'aggregator' directive. */ |
735 | { | |
e2bf6907 | 736 | struct tomoyo_aggregator *ptr; |
bd03a3e4 TH |
737 | struct list_head *list = |
738 | &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR]; | |
cdcf6723 | 739 | |
bd03a3e4 | 740 | /* Check 'aggregator' directive. */ |
a8f76409 | 741 | candidate = &exename; |
6bd5ce60 TH |
742 | list_for_each_entry_rcu(ptr, list, head.list, |
743 | srcu_read_lock_held(&tomoyo_ss)) { | |
82e0f001 | 744 | if (ptr->head.is_deleted || |
a8f76409 | 745 | !tomoyo_path_matches_pattern(&exename, |
1084307c TH |
746 | ptr->original_name)) |
747 | continue; | |
a8f76409 | 748 | candidate = ptr->aggregated_name; |
1084307c TH |
749 | break; |
750 | } | |
751 | } | |
752 | ||
26a2a1c9 | 753 | /* Check execute permission. */ |
6bce98ed | 754 | retval = tomoyo_execute_permission(&ee->r, candidate); |
17fcfbd9 TH |
755 | if (retval == TOMOYO_RETRY_REQUEST) |
756 | goto retry; | |
26a2a1c9 KT |
757 | if (retval < 0) |
758 | goto out; | |
484ca79c TH |
759 | /* |
760 | * To be able to specify domainnames with wildcards, use the | |
761 | * pathname specified in the policy (which may contain | |
762 | * wildcard) rather than the pathname passed to execve() | |
763 | * (which never contains wildcard). | |
764 | */ | |
a8f76409 TH |
765 | if (ee->r.param.path.matched_path) |
766 | candidate = ee->r.param.path.matched_path; | |
26a2a1c9 | 767 | |
6bce98ed TH |
768 | /* |
769 | * Check for domain transition preference if "file execute" matched. | |
770 | * If preference is given, make do_execve() fail if domain transition | |
771 | * has failed, for domain transition preference should be used with | |
772 | * destination domain defined. | |
773 | */ | |
774 | if (ee->transition) { | |
775 | const char *domainname = ee->transition->name; | |
cdcf6723 | 776 | |
6bce98ed TH |
777 | reject_on_transition_failure = true; |
778 | if (!strcmp(domainname, "keep")) | |
779 | goto force_keep_domain; | |
780 | if (!strcmp(domainname, "child")) | |
781 | goto force_child_domain; | |
782 | if (!strcmp(domainname, "reset")) | |
783 | goto force_reset_domain; | |
784 | if (!strcmp(domainname, "initialize")) | |
785 | goto force_initialize_domain; | |
786 | if (!strcmp(domainname, "parent")) { | |
787 | char *cp; | |
cdcf6723 | 788 | |
6bce98ed TH |
789 | strncpy(ee->tmp, old_domain->domainname->name, |
790 | TOMOYO_EXEC_TMPSIZE - 1); | |
791 | cp = strrchr(ee->tmp, ' '); | |
792 | if (cp) | |
793 | *cp = '\0'; | |
794 | } else if (*domainname == '<') | |
795 | strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1); | |
796 | else | |
797 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", | |
798 | old_domain->domainname->name, domainname); | |
799 | goto force_jump_domain; | |
800 | } | |
801 | /* | |
802 | * No domain transition preference specified. | |
803 | * Calculate domain to transit to. | |
804 | */ | |
bd03a3e4 | 805 | switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname, |
a8f76409 | 806 | candidate)) { |
bd03a3e4 | 807 | case TOMOYO_TRANSITION_CONTROL_RESET: |
6bce98ed | 808 | force_reset_domain: |
bd03a3e4 | 809 | /* Transit to the root of specified namespace. */ |
a8f76409 TH |
810 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", |
811 | candidate->name); | |
bd03a3e4 TH |
812 | /* |
813 | * Make do_execve() fail if domain transition across namespaces | |
814 | * has failed. | |
815 | */ | |
816 | reject_on_transition_failure = true; | |
817 | break; | |
5448ec4f | 818 | case TOMOYO_TRANSITION_CONTROL_INITIALIZE: |
6bce98ed | 819 | force_initialize_domain: |
bd03a3e4 | 820 | /* Transit to the child of current namespace's root. */ |
97fb35e4 | 821 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
a8f76409 | 822 | old_domain->ns->name, candidate->name); |
5448ec4f TH |
823 | break; |
824 | case TOMOYO_TRANSITION_CONTROL_KEEP: | |
6bce98ed | 825 | force_keep_domain: |
26a2a1c9 KT |
826 | /* Keep current domain. */ |
827 | domain = old_domain; | |
5448ec4f TH |
828 | break; |
829 | default: | |
830 | if (old_domain == &tomoyo_kernel_domain && | |
831 | !tomoyo_policy_loaded) { | |
832 | /* | |
833 | * Needn't to transit from kernel domain before | |
834 | * starting /sbin/init. But transit from kernel domain | |
835 | * if executing initializers because they might start | |
836 | * before /sbin/init. | |
837 | */ | |
838 | domain = old_domain; | |
a8f76409 | 839 | break; |
5448ec4f | 840 | } |
6bce98ed | 841 | force_child_domain: |
a8f76409 TH |
842 | /* Normal domain transition. */ |
843 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", | |
844 | old_domain->domainname->name, candidate->name); | |
5448ec4f | 845 | break; |
26a2a1c9 | 846 | } |
6bce98ed | 847 | force_jump_domain: |
7c75964f | 848 | if (!domain) |
97fb35e4 | 849 | domain = tomoyo_assign_domain(ee->tmp, true); |
26a2a1c9 | 850 | if (domain) |
bd03a3e4 TH |
851 | retval = 0; |
852 | else if (reject_on_transition_failure) { | |
cdcf6723 | 853 | pr_warn("ERROR: Domain '%s' not ready.\n", ee->tmp); |
bd03a3e4 | 854 | retval = -ENOMEM; |
97fb35e4 | 855 | } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING) |
bd03a3e4 TH |
856 | retval = -ENOMEM; |
857 | else { | |
858 | retval = 0; | |
2c47ab93 TH |
859 | if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) { |
860 | old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true; | |
97fb35e4 TH |
861 | ee->r.granted = false; |
862 | tomoyo_write_log(&ee->r, "%s", tomoyo_dif | |
2c47ab93 | 863 | [TOMOYO_DIF_TRANSITION_FAILED]); |
cdcf6723 | 864 | pr_warn("ERROR: Domain '%s' not defined.\n", ee->tmp); |
bd03a3e4 TH |
865 | } |
866 | } | |
26a2a1c9 | 867 | out: |
56f8c9bc TH |
868 | if (!domain) |
869 | domain = old_domain; | |
ec8e6a4e | 870 | /* Update reference count on "struct tomoyo_domain_info". */ |
8c6cb983 TH |
871 | { |
872 | struct tomoyo_task *s = tomoyo_task(current); | |
873 | ||
874 | s->old_domain_info = s->domain_info; | |
875 | s->domain_info = domain; | |
876 | atomic_inc(&domain->users); | |
877 | } | |
a8f76409 | 878 | kfree(exename.name); |
d58e0da8 TH |
879 | if (!retval) { |
880 | ee->r.domain = domain; | |
881 | retval = tomoyo_environ(ee); | |
882 | } | |
97fb35e4 TH |
883 | kfree(ee->tmp); |
884 | kfree(ee->dump.data); | |
885 | kfree(ee); | |
26a2a1c9 KT |
886 | return retval; |
887 | } | |
5b636857 TH |
888 | |
889 | /** | |
890 | * tomoyo_dump_page - Dump a page to buffer. | |
891 | * | |
892 | * @bprm: Pointer to "struct linux_binprm". | |
893 | * @pos: Location to dump. | |
894 | * @dump: Poiner to "struct tomoyo_page_dump". | |
895 | * | |
896 | * Returns true on success, false otherwise. | |
897 | */ | |
898 | bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos, | |
899 | struct tomoyo_page_dump *dump) | |
900 | { | |
901 | struct page *page; | |
d58e0da8 TH |
902 | |
903 | /* dump->data is released by tomoyo_find_next_domain(). */ | |
5b636857 TH |
904 | if (!dump->data) { |
905 | dump->data = kzalloc(PAGE_SIZE, GFP_NOFS); | |
906 | if (!dump->data) | |
907 | return false; | |
908 | } | |
909 | /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ | |
910 | #ifdef CONFIG_MMU | |
1e987790 DH |
911 | /* |
912 | * This is called at execve() time in order to dig around | |
913 | * in the argv/environment of the new proceess | |
914 | * (represented by bprm). 'current' is the process doing | |
915 | * the execve(). | |
916 | */ | |
917 | if (get_user_pages_remote(current, bprm->mm, pos, 1, | |
5b56d49f | 918 | FOLL_FORCE, &page, NULL, NULL) <= 0) |
5b636857 TH |
919 | return false; |
920 | #else | |
921 | page = bprm->page[pos / PAGE_SIZE]; | |
922 | #endif | |
923 | if (page != dump->page) { | |
924 | const unsigned int offset = pos % PAGE_SIZE; | |
925 | /* | |
926 | * Maybe kmap()/kunmap() should be used here. | |
927 | * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). | |
928 | * So do I. | |
929 | */ | |
c58e0377 | 930 | char *kaddr = kmap_atomic(page); |
d58e0da8 | 931 | |
5b636857 TH |
932 | dump->page = page; |
933 | memcpy(dump->data + offset, kaddr + offset, | |
934 | PAGE_SIZE - offset); | |
c58e0377 | 935 | kunmap_atomic(kaddr); |
5b636857 TH |
936 | } |
937 | /* Same with put_arg_page(page) in fs/exec.c */ | |
938 | #ifdef CONFIG_MMU | |
939 | put_page(page); | |
940 | #endif | |
941 | return true; | |
942 | } |