Commit | Line | Data |
---|---|---|
26a2a1c9 KT |
1 | /* |
2 | * security/tomoyo/domain.c | |
3 | * | |
c3ef1500 | 4 | * Domain transition functions for TOMOYO. |
26a2a1c9 | 5 | * |
c3ef1500 | 6 | * Copyright (C) 2005-2010 NTT DATA CORPORATION |
26a2a1c9 KT |
7 | */ |
8 | ||
9 | #include "common.h" | |
26a2a1c9 | 10 | #include <linux/binfmts.h> |
5a0e3ad6 | 11 | #include <linux/slab.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) { | |
44 | if (!check_duplicate(entry, new_entry)) | |
45 | continue; | |
a238cf5b | 46 | entry->is_deleted = param->is_delete; |
36f5e1ff TH |
47 | error = 0; |
48 | break; | |
49 | } | |
a238cf5b | 50 | if (error && !param->is_delete) { |
36f5e1ff TH |
51 | entry = tomoyo_commit_ok(new_entry, size); |
52 | if (entry) { | |
53 | list_add_tail_rcu(&entry->list, list); | |
54 | error = 0; | |
55 | } | |
56 | } | |
57 | mutex_unlock(&tomoyo_policy_lock); | |
58 | return error; | |
59 | } | |
60 | ||
0df7e8b8 TH |
61 | /** |
62 | * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry. | |
63 | * | |
64 | * @a: Pointer to "struct tomoyo_acl_info". | |
65 | * @b: Pointer to "struct tomoyo_acl_info". | |
66 | * | |
67 | * Returns true if @a == @b, false otherwise. | |
68 | */ | |
69 | static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a, | |
70 | const struct tomoyo_acl_info *b) | |
71 | { | |
2066a361 | 72 | return a->type == b->type && a->cond == b->cond; |
0df7e8b8 TH |
73 | } |
74 | ||
237ab459 TH |
75 | /** |
76 | * tomoyo_update_domain - Update an entry for domain policy. | |
77 | * | |
78 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
79 | * @size: Size of @new_entry in bytes. | |
a238cf5b | 80 | * @param: Pointer to "struct tomoyo_acl_param". |
237ab459 TH |
81 | * @check_duplicate: Callback function to find duplicated entry. |
82 | * @merge_duplicate: Callback function to merge duplicated entry. | |
83 | * | |
84 | * Returns 0 on success, negative value otherwise. | |
85 | * | |
86 | * Caller holds tomoyo_read_lock(). | |
87 | */ | |
88 | int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, | |
a238cf5b | 89 | struct tomoyo_acl_param *param, |
237ab459 TH |
90 | bool (*check_duplicate) (const struct tomoyo_acl_info |
91 | *, | |
92 | const struct tomoyo_acl_info | |
93 | *), | |
94 | bool (*merge_duplicate) (struct tomoyo_acl_info *, | |
95 | struct tomoyo_acl_info *, | |
96 | const bool)) | |
97 | { | |
a238cf5b | 98 | const bool is_delete = param->is_delete; |
237ab459 TH |
99 | int error = is_delete ? -ENOENT : -ENOMEM; |
100 | struct tomoyo_acl_info *entry; | |
a238cf5b | 101 | struct list_head * const list = param->list; |
237ab459 | 102 | |
2066a361 TH |
103 | if (param->data[0]) { |
104 | new_entry->cond = tomoyo_get_condition(param); | |
105 | if (!new_entry->cond) | |
106 | return -EINVAL; | |
107 | } | |
237ab459 | 108 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
2066a361 | 109 | goto out; |
a238cf5b | 110 | list_for_each_entry_rcu(entry, list, list) { |
0df7e8b8 TH |
111 | if (!tomoyo_same_acl_head(entry, new_entry) || |
112 | !check_duplicate(entry, new_entry)) | |
237ab459 TH |
113 | continue; |
114 | if (merge_duplicate) | |
115 | entry->is_deleted = merge_duplicate(entry, new_entry, | |
116 | is_delete); | |
117 | else | |
118 | entry->is_deleted = is_delete; | |
119 | error = 0; | |
120 | break; | |
121 | } | |
122 | if (error && !is_delete) { | |
123 | entry = tomoyo_commit_ok(new_entry, size); | |
124 | if (entry) { | |
a238cf5b | 125 | list_add_tail_rcu(&entry->list, list); |
237ab459 TH |
126 | error = 0; |
127 | } | |
128 | } | |
129 | mutex_unlock(&tomoyo_policy_lock); | |
2066a361 TH |
130 | out: |
131 | tomoyo_put_condition(new_entry->cond); | |
237ab459 TH |
132 | return error; |
133 | } | |
134 | ||
32997144 TH |
135 | /** |
136 | * tomoyo_check_acl - Do permission check. | |
137 | * | |
138 | * @r: Pointer to "struct tomoyo_request_info". | |
139 | * @check_entry: Callback function to check type specific parameters. | |
140 | * | |
141 | * Returns 0 on success, negative value otherwise. | |
142 | * | |
143 | * Caller holds tomoyo_read_lock(). | |
144 | */ | |
99a85259 | 145 | void tomoyo_check_acl(struct tomoyo_request_info *r, |
484ca79c | 146 | bool (*check_entry) (struct tomoyo_request_info *, |
99a85259 TH |
147 | const struct tomoyo_acl_info *)) |
148 | { | |
149 | const struct tomoyo_domain_info *domain = r->domain; | |
150 | struct tomoyo_acl_info *ptr; | |
32997144 TH |
151 | bool retried = false; |
152 | const struct list_head *list = &domain->acl_info_list; | |
99a85259 | 153 | |
32997144 TH |
154 | retry: |
155 | list_for_each_entry_rcu(ptr, list, list) { | |
99a85259 TH |
156 | if (ptr->is_deleted || ptr->type != r->param_type) |
157 | continue; | |
2066a361 TH |
158 | if (!check_entry(r, ptr)) |
159 | continue; | |
160 | if (!tomoyo_condition(r, ptr->cond)) | |
161 | continue; | |
162 | r->granted = true; | |
163 | return; | |
99a85259 | 164 | } |
32997144 TH |
165 | if (!retried) { |
166 | retried = true; | |
bd03a3e4 | 167 | list = &domain->ns->acl_group[domain->group]; |
32997144 TH |
168 | goto retry; |
169 | } | |
99a85259 TH |
170 | r->granted = false; |
171 | } | |
172 | ||
a230f9e7 | 173 | /* The list for "struct tomoyo_domain_info". */ |
26a2a1c9 | 174 | LIST_HEAD(tomoyo_domain_list); |
26a2a1c9 | 175 | |
26a2a1c9 | 176 | /** |
e2bf6907 | 177 | * tomoyo_last_word - Get last component of a domainname. |
26a2a1c9 | 178 | * |
bd03a3e4 | 179 | * @name: Domainname to check. |
26a2a1c9 | 180 | * |
e2bf6907 | 181 | * Returns the last word of @domainname. |
26a2a1c9 | 182 | */ |
e2bf6907 | 183 | static const char *tomoyo_last_word(const char *name) |
26a2a1c9 | 184 | { |
e2bf6907 TH |
185 | const char *cp = strrchr(name, ' '); |
186 | if (cp) | |
187 | return cp + 1; | |
188 | return name; | |
26a2a1c9 KT |
189 | } |
190 | ||
a238cf5b TH |
191 | /** |
192 | * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry. | |
193 | * | |
194 | * @a: Pointer to "struct tomoyo_acl_head". | |
195 | * @b: Pointer to "struct tomoyo_acl_head". | |
196 | * | |
197 | * Returns true if @a == @b, false otherwise. | |
198 | */ | |
e2bf6907 TH |
199 | static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a, |
200 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 201 | { |
5448ec4f TH |
202 | const struct tomoyo_transition_control *p1 = container_of(a, |
203 | typeof(*p1), | |
204 | head); | |
205 | const struct tomoyo_transition_control *p2 = container_of(b, | |
206 | typeof(*p2), | |
207 | head); | |
208 | return p1->type == p2->type && p1->is_last_name == p2->is_last_name | |
36f5e1ff TH |
209 | && p1->domainname == p2->domainname |
210 | && p1->program == p2->program; | |
211 | } | |
212 | ||
26a2a1c9 | 213 | /** |
a238cf5b | 214 | * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list. |
26a2a1c9 | 215 | * |
a238cf5b TH |
216 | * @param: Pointer to "struct tomoyo_acl_param". |
217 | * @type: Type of this entry. | |
26a2a1c9 KT |
218 | * |
219 | * Returns 0 on success, negative value otherwise. | |
220 | */ | |
a238cf5b TH |
221 | int tomoyo_write_transition_control(struct tomoyo_acl_param *param, |
222 | const u8 type) | |
26a2a1c9 | 223 | { |
5448ec4f | 224 | struct tomoyo_transition_control e = { .type = type }; |
a238cf5b TH |
225 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
226 | char *program = param->data; | |
227 | char *domainname = strstr(program, " from "); | |
228 | if (domainname) { | |
229 | *domainname = '\0'; | |
230 | domainname += 6; | |
231 | } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP || | |
232 | type == TOMOYO_TRANSITION_CONTROL_KEEP) { | |
233 | domainname = program; | |
234 | program = NULL; | |
235 | } | |
0d2171d7 | 236 | if (program && strcmp(program, "any")) { |
5448ec4f TH |
237 | if (!tomoyo_correct_path(program)) |
238 | return -EINVAL; | |
239 | e.program = tomoyo_get_name(program); | |
240 | if (!e.program) | |
241 | goto out; | |
242 | } | |
0d2171d7 | 243 | if (domainname && strcmp(domainname, "any")) { |
5448ec4f TH |
244 | if (!tomoyo_correct_domain(domainname)) { |
245 | if (!tomoyo_correct_path(domainname)) | |
246 | goto out; | |
9e4b50e9 | 247 | e.is_last_name = true; |
5448ec4f | 248 | } |
9e4b50e9 TH |
249 | e.domainname = tomoyo_get_name(domainname); |
250 | if (!e.domainname) | |
ca0b7df3 | 251 | goto out; |
26a2a1c9 | 252 | } |
bd03a3e4 | 253 | param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; |
a238cf5b | 254 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 255 | tomoyo_same_transition_control); |
a238cf5b | 256 | out: |
9e4b50e9 TH |
257 | tomoyo_put_name(e.domainname); |
258 | tomoyo_put_name(e.program); | |
26a2a1c9 KT |
259 | return error; |
260 | } | |
261 | ||
26a2a1c9 | 262 | /** |
bd03a3e4 | 263 | * tomoyo_scan_transition - Try to find specific domain transition type. |
26a2a1c9 | 264 | * |
bd03a3e4 TH |
265 | * @list: Pointer to "struct list_head". |
266 | * @domainname: The name of current domain. | |
267 | * @program: The name of requested program. | |
268 | * @last_name: The last component of @domainname. | |
269 | * @type: One of values in "enum tomoyo_transition_type". | |
26a2a1c9 | 270 | * |
bd03a3e4 | 271 | * Returns true if found one, false otherwise. |
fdb8ebb7 TH |
272 | * |
273 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 274 | */ |
bd03a3e4 TH |
275 | static inline bool tomoyo_scan_transition |
276 | (const struct list_head *list, const struct tomoyo_path_info *domainname, | |
277 | const struct tomoyo_path_info *program, const char *last_name, | |
278 | const enum tomoyo_transition_type type) | |
26a2a1c9 | 279 | { |
5448ec4f | 280 | const struct tomoyo_transition_control *ptr; |
bd03a3e4 TH |
281 | list_for_each_entry_rcu(ptr, list, head.list) { |
282 | if (ptr->head.is_deleted || ptr->type != type) | |
283 | continue; | |
284 | if (ptr->domainname) { | |
285 | if (!ptr->is_last_name) { | |
286 | if (ptr->domainname != domainname) | |
287 | continue; | |
288 | } else { | |
5448ec4f | 289 | /* |
bd03a3e4 TH |
290 | * Use direct strcmp() since this is |
291 | * unlikely used. | |
5448ec4f | 292 | */ |
bd03a3e4 TH |
293 | if (strcmp(ptr->domainname->name, last_name)) |
294 | continue; | |
5448ec4f | 295 | } |
26a2a1c9 | 296 | } |
bd03a3e4 TH |
297 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) |
298 | continue; | |
299 | return true; | |
300 | } | |
301 | return false; | |
302 | } | |
303 | ||
304 | /** | |
305 | * tomoyo_transition_type - Get domain transition type. | |
306 | * | |
307 | * @ns: Pointer to "struct tomoyo_policy_namespace". | |
308 | * @domainname: The name of current domain. | |
309 | * @program: The name of requested program. | |
310 | * | |
311 | * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes | |
312 | * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if | |
313 | * executing @program reinitializes domain transition within that namespace, | |
314 | * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname , | |
315 | * others otherwise. | |
316 | * | |
317 | * Caller holds tomoyo_read_lock(). | |
318 | */ | |
319 | static enum tomoyo_transition_type tomoyo_transition_type | |
320 | (const struct tomoyo_policy_namespace *ns, | |
321 | const struct tomoyo_path_info *domainname, | |
322 | const struct tomoyo_path_info *program) | |
323 | { | |
324 | const char *last_name = tomoyo_last_word(domainname->name); | |
325 | enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET; | |
326 | while (type < TOMOYO_MAX_TRANSITION_TYPE) { | |
327 | const struct list_head * const list = | |
328 | &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; | |
329 | if (!tomoyo_scan_transition(list, domainname, program, | |
330 | last_name, type)) { | |
331 | type++; | |
332 | continue; | |
333 | } | |
334 | if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET && | |
335 | type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE) | |
336 | break; | |
337 | /* | |
338 | * Do not check for reset_domain if no_reset_domain matched. | |
339 | * Do not check for initialize_domain if no_initialize_domain | |
340 | * matched. | |
341 | */ | |
342 | type++; | |
343 | type++; | |
26a2a1c9 | 344 | } |
5448ec4f | 345 | return type; |
26a2a1c9 KT |
346 | } |
347 | ||
a238cf5b TH |
348 | /** |
349 | * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry. | |
350 | * | |
351 | * @a: Pointer to "struct tomoyo_acl_head". | |
352 | * @b: Pointer to "struct tomoyo_acl_head". | |
353 | * | |
354 | * Returns true if @a == @b, false otherwise. | |
355 | */ | |
e2bf6907 TH |
356 | static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a, |
357 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 358 | { |
a238cf5b TH |
359 | const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1), |
360 | head); | |
361 | const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2), | |
362 | head); | |
36f5e1ff TH |
363 | return p1->original_name == p2->original_name && |
364 | p1->aggregated_name == p2->aggregated_name; | |
365 | } | |
366 | ||
1084307c | 367 | /** |
a238cf5b | 368 | * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list. |
1084307c | 369 | * |
a238cf5b | 370 | * @param: Pointer to "struct tomoyo_acl_param". |
1084307c TH |
371 | * |
372 | * Returns 0 on success, negative value otherwise. | |
373 | * | |
374 | * Caller holds tomoyo_read_lock(). | |
375 | */ | |
a238cf5b | 376 | int tomoyo_write_aggregator(struct tomoyo_acl_param *param) |
1084307c | 377 | { |
e2bf6907 | 378 | struct tomoyo_aggregator e = { }; |
a238cf5b TH |
379 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
380 | const char *original_name = tomoyo_read_token(param); | |
381 | const char *aggregated_name = tomoyo_read_token(param); | |
382 | if (!tomoyo_correct_word(original_name) || | |
75093152 | 383 | !tomoyo_correct_path(aggregated_name)) |
1084307c TH |
384 | return -EINVAL; |
385 | e.original_name = tomoyo_get_name(original_name); | |
386 | e.aggregated_name = tomoyo_get_name(aggregated_name); | |
387 | if (!e.original_name || !e.aggregated_name || | |
388 | e.aggregated_name->is_patterned) /* No patterns allowed. */ | |
389 | goto out; | |
bd03a3e4 | 390 | param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR]; |
a238cf5b | 391 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 392 | tomoyo_same_aggregator); |
a238cf5b | 393 | out: |
1084307c TH |
394 | tomoyo_put_name(e.original_name); |
395 | tomoyo_put_name(e.aggregated_name); | |
396 | return error; | |
397 | } | |
398 | ||
26a2a1c9 | 399 | /** |
bd03a3e4 | 400 | * tomoyo_find_namespace - Find specified namespace. |
26a2a1c9 | 401 | * |
bd03a3e4 TH |
402 | * @name: Name of namespace to find. |
403 | * @len: Length of @name. | |
26a2a1c9 | 404 | * |
bd03a3e4 TH |
405 | * Returns pointer to "struct tomoyo_policy_namespace" if found, |
406 | * NULL otherwise. | |
fdb8ebb7 TH |
407 | * |
408 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 409 | */ |
bd03a3e4 TH |
410 | static struct tomoyo_policy_namespace *tomoyo_find_namespace |
411 | (const char *name, const unsigned int len) | |
26a2a1c9 | 412 | { |
bd03a3e4 TH |
413 | struct tomoyo_policy_namespace *ns; |
414 | list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { | |
415 | if (strncmp(name, ns->name, len) || | |
416 | (name[len] && name[len] != ' ')) | |
417 | continue; | |
418 | return ns; | |
419 | } | |
420 | return NULL; | |
421 | } | |
26a2a1c9 | 422 | |
bd03a3e4 TH |
423 | /** |
424 | * tomoyo_assign_namespace - Create a new namespace. | |
425 | * | |
426 | * @domainname: Name of namespace to create. | |
427 | * | |
428 | * Returns pointer to "struct tomoyo_policy_namespace" on success, | |
429 | * NULL otherwise. | |
430 | * | |
431 | * Caller holds tomoyo_read_lock(). | |
432 | */ | |
433 | struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname) | |
434 | { | |
435 | struct tomoyo_policy_namespace *ptr; | |
436 | struct tomoyo_policy_namespace *entry; | |
437 | const char *cp = domainname; | |
438 | unsigned int len = 0; | |
439 | while (*cp && *cp++ != ' ') | |
440 | len++; | |
441 | ptr = tomoyo_find_namespace(domainname, len); | |
442 | if (ptr) | |
443 | return ptr; | |
444 | if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname)) | |
ca0b7df3 | 445 | return NULL; |
bd03a3e4 TH |
446 | entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS); |
447 | if (!entry) | |
ca0b7df3 | 448 | return NULL; |
29282381 TH |
449 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
450 | goto out; | |
bd03a3e4 TH |
451 | ptr = tomoyo_find_namespace(domainname, len); |
452 | if (!ptr && tomoyo_memory_ok(entry)) { | |
453 | char *name = (char *) (entry + 1); | |
454 | ptr = entry; | |
455 | memmove(name, domainname, len); | |
456 | name[len] = '\0'; | |
457 | entry->name = name; | |
458 | tomoyo_init_policy_namespace(entry); | |
ca0b7df3 | 459 | entry = NULL; |
26a2a1c9 | 460 | } |
f737d95d | 461 | mutex_unlock(&tomoyo_policy_lock); |
bd03a3e4 | 462 | out: |
ca0b7df3 | 463 | kfree(entry); |
bd03a3e4 TH |
464 | return ptr; |
465 | } | |
466 | ||
467 | /** | |
468 | * tomoyo_namespace_jump - Check for namespace jump. | |
469 | * | |
470 | * @domainname: Name of domain. | |
471 | * | |
472 | * Returns true if namespace differs, false otherwise. | |
473 | */ | |
474 | static bool tomoyo_namespace_jump(const char *domainname) | |
475 | { | |
476 | const char *namespace = tomoyo_current_namespace()->name; | |
477 | const int len = strlen(namespace); | |
478 | return strncmp(domainname, namespace, len) || | |
479 | (domainname[len] && domainname[len] != ' '); | |
480 | } | |
481 | ||
482 | /** | |
483 | * tomoyo_assign_domain - Create a domain or a namespace. | |
484 | * | |
485 | * @domainname: The name of domain. | |
486 | * @transit: True if transit to domain found or created. | |
487 | * | |
488 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
489 | * | |
490 | * Caller holds tomoyo_read_lock(). | |
491 | */ | |
492 | struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, | |
493 | const bool transit) | |
494 | { | |
495 | struct tomoyo_domain_info e = { }; | |
496 | struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname); | |
497 | bool created = false; | |
498 | if (entry) { | |
499 | if (transit) { | |
500 | /* | |
501 | * Since namespace is created at runtime, profiles may | |
502 | * not be created by the moment the process transits to | |
503 | * that domain. Do not perform domain transition if | |
504 | * profile for that domain is not yet created. | |
505 | */ | |
506 | if (!entry->ns->profile_ptr[entry->profile]) | |
507 | return NULL; | |
508 | } | |
509 | return entry; | |
510 | } | |
511 | /* Requested domain does not exist. */ | |
512 | /* Don't create requested domain if domainname is invalid. */ | |
513 | if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 || | |
514 | !tomoyo_correct_domain(domainname)) | |
515 | return NULL; | |
516 | /* | |
517 | * Since definition of profiles and acl_groups may differ across | |
518 | * namespaces, do not inherit "use_profile" and "use_group" settings | |
519 | * by automatically creating requested domain upon domain transition. | |
520 | */ | |
521 | if (transit && tomoyo_namespace_jump(domainname)) | |
522 | return NULL; | |
523 | e.ns = tomoyo_assign_namespace(domainname); | |
524 | if (!e.ns) | |
525 | return NULL; | |
526 | /* | |
527 | * "use_profile" and "use_group" settings for automatically created | |
528 | * domains are inherited from current domain. These are 0 for manually | |
529 | * created domains. | |
530 | */ | |
531 | if (transit) { | |
532 | const struct tomoyo_domain_info *domain = tomoyo_domain(); | |
533 | e.profile = domain->profile; | |
534 | e.group = domain->group; | |
535 | } | |
536 | e.domainname = tomoyo_get_name(domainname); | |
537 | if (!e.domainname) | |
538 | return NULL; | |
539 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
540 | goto out; | |
541 | entry = tomoyo_find_domain(domainname); | |
542 | if (!entry) { | |
543 | entry = tomoyo_commit_ok(&e, sizeof(e)); | |
544 | if (entry) { | |
545 | INIT_LIST_HEAD(&entry->acl_info_list); | |
546 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); | |
547 | created = true; | |
548 | } | |
549 | } | |
550 | mutex_unlock(&tomoyo_policy_lock); | |
551 | out: | |
552 | tomoyo_put_name(e.domainname); | |
553 | if (entry && transit) { | |
554 | if (created) { | |
555 | struct tomoyo_request_info r; | |
556 | tomoyo_init_request_info(&r, entry, | |
557 | TOMOYO_MAC_FILE_EXECUTE); | |
558 | r.granted = false; | |
559 | tomoyo_write_log(&r, "use_profile %u\n", | |
560 | entry->profile); | |
561 | tomoyo_write_log(&r, "use_group %u\n", entry->group); | |
562 | } | |
563 | } | |
564 | return entry; | |
26a2a1c9 KT |
565 | } |
566 | ||
567 | /** | |
568 | * tomoyo_find_next_domain - Find a domain. | |
569 | * | |
56f8c9bc | 570 | * @bprm: Pointer to "struct linux_binprm". |
26a2a1c9 KT |
571 | * |
572 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
573 | * |
574 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 575 | */ |
56f8c9bc | 576 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
26a2a1c9 | 577 | { |
26a2a1c9 KT |
578 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
579 | struct tomoyo_domain_info *domain = NULL; | |
26a2a1c9 | 580 | const char *original_name = bprm->filename; |
26a2a1c9 | 581 | int retval = -ENOMEM; |
c8c57e84 | 582 | bool need_kfree = false; |
bd03a3e4 | 583 | bool reject_on_transition_failure = false; |
c8c57e84 | 584 | struct tomoyo_path_info rn = { }; /* real name */ |
97fb35e4 TH |
585 | struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS); |
586 | if (!ee) | |
587 | return -ENOMEM; | |
588 | ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
589 | if (!ee->tmp) { | |
590 | kfree(ee); | |
591 | return -ENOMEM; | |
592 | } | |
593 | /* ee->dump->data is allocated by tomoyo_dump_page(). */ | |
594 | tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE); | |
595 | ee->r.ee = ee; | |
596 | ee->bprm = bprm; | |
597 | ee->r.obj = &ee->obj; | |
598 | ee->obj.path1 = bprm->file->f_path; | |
17fcfbd9 | 599 | retry: |
c8c57e84 TH |
600 | if (need_kfree) { |
601 | kfree(rn.name); | |
602 | need_kfree = false; | |
603 | } | |
0617c7ff | 604 | /* Get symlink's pathname of program. */ |
26a2a1c9 | 605 | retval = -ENOENT; |
0617c7ff | 606 | rn.name = tomoyo_realpath_nofollow(original_name); |
c8c57e84 | 607 | if (!rn.name) |
26a2a1c9 | 608 | goto out; |
c8c57e84 TH |
609 | tomoyo_fill_path_info(&rn); |
610 | need_kfree = true; | |
611 | ||
1084307c TH |
612 | /* Check 'aggregator' directive. */ |
613 | { | |
e2bf6907 | 614 | struct tomoyo_aggregator *ptr; |
bd03a3e4 TH |
615 | struct list_head *list = |
616 | &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR]; | |
617 | /* Check 'aggregator' directive. */ | |
618 | list_for_each_entry_rcu(ptr, list, head.list) { | |
82e0f001 | 619 | if (ptr->head.is_deleted || |
1084307c TH |
620 | !tomoyo_path_matches_pattern(&rn, |
621 | ptr->original_name)) | |
622 | continue; | |
0617c7ff | 623 | kfree(rn.name); |
1084307c TH |
624 | need_kfree = false; |
625 | /* This is OK because it is read only. */ | |
626 | rn = *ptr->aggregated_name; | |
627 | break; | |
628 | } | |
629 | } | |
630 | ||
26a2a1c9 | 631 | /* Check execute permission. */ |
97fb35e4 | 632 | retval = tomoyo_path_permission(&ee->r, TOMOYO_TYPE_EXECUTE, &rn); |
17fcfbd9 TH |
633 | if (retval == TOMOYO_RETRY_REQUEST) |
634 | goto retry; | |
26a2a1c9 KT |
635 | if (retval < 0) |
636 | goto out; | |
484ca79c TH |
637 | /* |
638 | * To be able to specify domainnames with wildcards, use the | |
639 | * pathname specified in the policy (which may contain | |
640 | * wildcard) rather than the pathname passed to execve() | |
641 | * (which never contains wildcard). | |
642 | */ | |
97fb35e4 | 643 | if (ee->r.param.path.matched_path) { |
484ca79c TH |
644 | if (need_kfree) |
645 | kfree(rn.name); | |
646 | need_kfree = false; | |
647 | /* This is OK because it is read only. */ | |
97fb35e4 | 648 | rn = *ee->r.param.path.matched_path; |
484ca79c | 649 | } |
26a2a1c9 | 650 | |
5448ec4f | 651 | /* Calculate domain to transit to. */ |
bd03a3e4 TH |
652 | switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname, |
653 | &rn)) { | |
654 | case TOMOYO_TRANSITION_CONTROL_RESET: | |
655 | /* Transit to the root of specified namespace. */ | |
97fb35e4 | 656 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", rn.name); |
bd03a3e4 TH |
657 | /* |
658 | * Make do_execve() fail if domain transition across namespaces | |
659 | * has failed. | |
660 | */ | |
661 | reject_on_transition_failure = true; | |
662 | break; | |
5448ec4f | 663 | case TOMOYO_TRANSITION_CONTROL_INITIALIZE: |
bd03a3e4 | 664 | /* Transit to the child of current namespace's root. */ |
97fb35e4 | 665 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
bd03a3e4 | 666 | old_domain->ns->name, rn.name); |
5448ec4f TH |
667 | break; |
668 | case TOMOYO_TRANSITION_CONTROL_KEEP: | |
26a2a1c9 KT |
669 | /* Keep current domain. */ |
670 | domain = old_domain; | |
5448ec4f TH |
671 | break; |
672 | default: | |
673 | if (old_domain == &tomoyo_kernel_domain && | |
674 | !tomoyo_policy_loaded) { | |
675 | /* | |
676 | * Needn't to transit from kernel domain before | |
677 | * starting /sbin/init. But transit from kernel domain | |
678 | * if executing initializers because they might start | |
679 | * before /sbin/init. | |
680 | */ | |
681 | domain = old_domain; | |
682 | } else { | |
683 | /* Normal domain transition. */ | |
97fb35e4 | 684 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
5448ec4f TH |
685 | old_domain->domainname->name, rn.name); |
686 | } | |
687 | break; | |
26a2a1c9 | 688 | } |
7c75964f | 689 | if (!domain) |
97fb35e4 | 690 | domain = tomoyo_assign_domain(ee->tmp, true); |
26a2a1c9 | 691 | if (domain) |
bd03a3e4 TH |
692 | retval = 0; |
693 | else if (reject_on_transition_failure) { | |
97fb35e4 TH |
694 | printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n", |
695 | ee->tmp); | |
bd03a3e4 | 696 | retval = -ENOMEM; |
97fb35e4 | 697 | } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING) |
bd03a3e4 TH |
698 | retval = -ENOMEM; |
699 | else { | |
700 | retval = 0; | |
2c47ab93 TH |
701 | if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) { |
702 | old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true; | |
97fb35e4 TH |
703 | ee->r.granted = false; |
704 | tomoyo_write_log(&ee->r, "%s", tomoyo_dif | |
2c47ab93 | 705 | [TOMOYO_DIF_TRANSITION_FAILED]); |
bd03a3e4 | 706 | printk(KERN_WARNING |
97fb35e4 | 707 | "ERROR: Domain '%s' not defined.\n", ee->tmp); |
bd03a3e4 TH |
708 | } |
709 | } | |
26a2a1c9 | 710 | out: |
56f8c9bc TH |
711 | if (!domain) |
712 | domain = old_domain; | |
ec8e6a4e TH |
713 | /* Update reference count on "struct tomoyo_domain_info". */ |
714 | atomic_inc(&domain->users); | |
56f8c9bc | 715 | bprm->cred->security = domain; |
c8c57e84 TH |
716 | if (need_kfree) |
717 | kfree(rn.name); | |
97fb35e4 TH |
718 | kfree(ee->tmp); |
719 | kfree(ee->dump.data); | |
720 | kfree(ee); | |
26a2a1c9 KT |
721 | return retval; |
722 | } | |
5b636857 TH |
723 | |
724 | /** | |
725 | * tomoyo_dump_page - Dump a page to buffer. | |
726 | * | |
727 | * @bprm: Pointer to "struct linux_binprm". | |
728 | * @pos: Location to dump. | |
729 | * @dump: Poiner to "struct tomoyo_page_dump". | |
730 | * | |
731 | * Returns true on success, false otherwise. | |
732 | */ | |
733 | bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos, | |
734 | struct tomoyo_page_dump *dump) | |
735 | { | |
736 | struct page *page; | |
737 | /* dump->data is released by tomoyo_finish_execve(). */ | |
738 | if (!dump->data) { | |
739 | dump->data = kzalloc(PAGE_SIZE, GFP_NOFS); | |
740 | if (!dump->data) | |
741 | return false; | |
742 | } | |
743 | /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ | |
744 | #ifdef CONFIG_MMU | |
745 | if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) | |
746 | return false; | |
747 | #else | |
748 | page = bprm->page[pos / PAGE_SIZE]; | |
749 | #endif | |
750 | if (page != dump->page) { | |
751 | const unsigned int offset = pos % PAGE_SIZE; | |
752 | /* | |
753 | * Maybe kmap()/kunmap() should be used here. | |
754 | * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). | |
755 | * So do I. | |
756 | */ | |
757 | char *kaddr = kmap_atomic(page, KM_USER0); | |
758 | dump->page = page; | |
759 | memcpy(dump->data + offset, kaddr + offset, | |
760 | PAGE_SIZE - offset); | |
761 | kunmap_atomic(kaddr, KM_USER0); | |
762 | } | |
763 | /* Same with put_arg_page(page) in fs/exec.c */ | |
764 | #ifdef CONFIG_MMU | |
765 | put_page(page); | |
766 | #endif | |
767 | return true; | |
768 | } |