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Commit | Line | Data |
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26a2a1c9 KT |
1 | /* |
2 | * security/tomoyo/domain.c | |
3 | * | |
0f2a55d5 | 4 | * Copyright (C) 2005-2011 NTT DATA CORPORATION |
26a2a1c9 KT |
5 | */ |
6 | ||
7 | #include "common.h" | |
26a2a1c9 | 8 | #include <linux/binfmts.h> |
5a0e3ad6 | 9 | #include <linux/slab.h> |
26a2a1c9 KT |
10 | |
11 | /* Variables definitions.*/ | |
12 | ||
13 | /* The initial domain. */ | |
14 | struct tomoyo_domain_info tomoyo_kernel_domain; | |
15 | ||
36f5e1ff TH |
16 | /** |
17 | * tomoyo_update_policy - Update an entry for exception policy. | |
18 | * | |
19 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
20 | * @size: Size of @new_entry in bytes. | |
a238cf5b | 21 | * @param: Pointer to "struct tomoyo_acl_param". |
36f5e1ff TH |
22 | * @check_duplicate: Callback function to find duplicated entry. |
23 | * | |
24 | * Returns 0 on success, negative value otherwise. | |
25 | * | |
26 | * Caller holds tomoyo_read_lock(). | |
27 | */ | |
28 | int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size, | |
a238cf5b | 29 | struct tomoyo_acl_param *param, |
36f5e1ff TH |
30 | bool (*check_duplicate) (const struct tomoyo_acl_head |
31 | *, | |
32 | const struct tomoyo_acl_head | |
33 | *)) | |
34 | { | |
a238cf5b | 35 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
36f5e1ff | 36 | struct tomoyo_acl_head *entry; |
a238cf5b | 37 | struct list_head *list = param->list; |
36f5e1ff TH |
38 | |
39 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
40 | return -ENOMEM; | |
41 | list_for_each_entry_rcu(entry, list, list) { | |
42 | if (!check_duplicate(entry, new_entry)) | |
43 | continue; | |
a238cf5b | 44 | entry->is_deleted = param->is_delete; |
36f5e1ff TH |
45 | error = 0; |
46 | break; | |
47 | } | |
a238cf5b | 48 | if (error && !param->is_delete) { |
36f5e1ff TH |
49 | entry = tomoyo_commit_ok(new_entry, size); |
50 | if (entry) { | |
51 | list_add_tail_rcu(&entry->list, list); | |
52 | error = 0; | |
53 | } | |
54 | } | |
55 | mutex_unlock(&tomoyo_policy_lock); | |
56 | return error; | |
57 | } | |
58 | ||
0df7e8b8 TH |
59 | /** |
60 | * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry. | |
61 | * | |
62 | * @a: Pointer to "struct tomoyo_acl_info". | |
63 | * @b: Pointer to "struct tomoyo_acl_info". | |
64 | * | |
65 | * Returns true if @a == @b, false otherwise. | |
66 | */ | |
67 | static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a, | |
68 | const struct tomoyo_acl_info *b) | |
69 | { | |
2066a361 | 70 | return a->type == b->type && a->cond == b->cond; |
0df7e8b8 TH |
71 | } |
72 | ||
237ab459 TH |
73 | /** |
74 | * tomoyo_update_domain - Update an entry for domain policy. | |
75 | * | |
76 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
77 | * @size: Size of @new_entry in bytes. | |
a238cf5b | 78 | * @param: Pointer to "struct tomoyo_acl_param". |
237ab459 TH |
79 | * @check_duplicate: Callback function to find duplicated entry. |
80 | * @merge_duplicate: Callback function to merge duplicated entry. | |
81 | * | |
82 | * Returns 0 on success, negative value otherwise. | |
83 | * | |
84 | * Caller holds tomoyo_read_lock(). | |
85 | */ | |
86 | int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, | |
a238cf5b | 87 | struct tomoyo_acl_param *param, |
237ab459 TH |
88 | bool (*check_duplicate) (const struct tomoyo_acl_info |
89 | *, | |
90 | const struct tomoyo_acl_info | |
91 | *), | |
92 | bool (*merge_duplicate) (struct tomoyo_acl_info *, | |
93 | struct tomoyo_acl_info *, | |
94 | const bool)) | |
95 | { | |
a238cf5b | 96 | const bool is_delete = param->is_delete; |
237ab459 TH |
97 | int error = is_delete ? -ENOENT : -ENOMEM; |
98 | struct tomoyo_acl_info *entry; | |
a238cf5b | 99 | struct list_head * const list = param->list; |
237ab459 | 100 | |
2066a361 TH |
101 | if (param->data[0]) { |
102 | new_entry->cond = tomoyo_get_condition(param); | |
103 | if (!new_entry->cond) | |
104 | return -EINVAL; | |
105 | } | |
237ab459 | 106 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
2066a361 | 107 | goto out; |
a238cf5b | 108 | list_for_each_entry_rcu(entry, list, list) { |
0df7e8b8 TH |
109 | if (!tomoyo_same_acl_head(entry, new_entry) || |
110 | !check_duplicate(entry, new_entry)) | |
237ab459 TH |
111 | continue; |
112 | if (merge_duplicate) | |
113 | entry->is_deleted = merge_duplicate(entry, new_entry, | |
114 | is_delete); | |
115 | else | |
116 | entry->is_deleted = is_delete; | |
117 | error = 0; | |
118 | break; | |
119 | } | |
120 | if (error && !is_delete) { | |
121 | entry = tomoyo_commit_ok(new_entry, size); | |
122 | if (entry) { | |
a238cf5b | 123 | list_add_tail_rcu(&entry->list, list); |
237ab459 TH |
124 | error = 0; |
125 | } | |
126 | } | |
127 | mutex_unlock(&tomoyo_policy_lock); | |
2066a361 TH |
128 | out: |
129 | tomoyo_put_condition(new_entry->cond); | |
237ab459 TH |
130 | return error; |
131 | } | |
132 | ||
32997144 TH |
133 | /** |
134 | * tomoyo_check_acl - Do permission check. | |
135 | * | |
136 | * @r: Pointer to "struct tomoyo_request_info". | |
137 | * @check_entry: Callback function to check type specific parameters. | |
138 | * | |
139 | * Returns 0 on success, negative value otherwise. | |
140 | * | |
141 | * Caller holds tomoyo_read_lock(). | |
142 | */ | |
99a85259 | 143 | void tomoyo_check_acl(struct tomoyo_request_info *r, |
484ca79c | 144 | bool (*check_entry) (struct tomoyo_request_info *, |
99a85259 TH |
145 | const struct tomoyo_acl_info *)) |
146 | { | |
147 | const struct tomoyo_domain_info *domain = r->domain; | |
148 | struct tomoyo_acl_info *ptr; | |
32997144 TH |
149 | bool retried = false; |
150 | const struct list_head *list = &domain->acl_info_list; | |
99a85259 | 151 | |
32997144 TH |
152 | retry: |
153 | list_for_each_entry_rcu(ptr, list, list) { | |
99a85259 TH |
154 | if (ptr->is_deleted || ptr->type != r->param_type) |
155 | continue; | |
2066a361 TH |
156 | if (!check_entry(r, ptr)) |
157 | continue; | |
158 | if (!tomoyo_condition(r, ptr->cond)) | |
159 | continue; | |
1f067a68 | 160 | r->matched_acl = ptr; |
2066a361 TH |
161 | r->granted = true; |
162 | return; | |
99a85259 | 163 | } |
32997144 TH |
164 | if (!retried) { |
165 | retried = true; | |
bd03a3e4 | 166 | list = &domain->ns->acl_group[domain->group]; |
32997144 TH |
167 | goto retry; |
168 | } | |
99a85259 TH |
169 | r->granted = false; |
170 | } | |
171 | ||
a230f9e7 | 172 | /* The list for "struct tomoyo_domain_info". */ |
26a2a1c9 | 173 | LIST_HEAD(tomoyo_domain_list); |
26a2a1c9 | 174 | |
26a2a1c9 | 175 | /** |
e2bf6907 | 176 | * tomoyo_last_word - Get last component of a domainname. |
26a2a1c9 | 177 | * |
bd03a3e4 | 178 | * @name: Domainname to check. |
26a2a1c9 | 179 | * |
e2bf6907 | 180 | * Returns the last word of @domainname. |
26a2a1c9 | 181 | */ |
e2bf6907 | 182 | static const char *tomoyo_last_word(const char *name) |
26a2a1c9 | 183 | { |
0f2a55d5 TH |
184 | const char *cp = strrchr(name, ' '); |
185 | if (cp) | |
186 | return cp + 1; | |
187 | return name; | |
26a2a1c9 KT |
188 | } |
189 | ||
a238cf5b TH |
190 | /** |
191 | * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry. | |
192 | * | |
193 | * @a: Pointer to "struct tomoyo_acl_head". | |
194 | * @b: Pointer to "struct tomoyo_acl_head". | |
195 | * | |
196 | * Returns true if @a == @b, false otherwise. | |
197 | */ | |
e2bf6907 TH |
198 | static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a, |
199 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 200 | { |
5448ec4f TH |
201 | const struct tomoyo_transition_control *p1 = container_of(a, |
202 | typeof(*p1), | |
203 | head); | |
204 | const struct tomoyo_transition_control *p2 = container_of(b, | |
205 | typeof(*p2), | |
206 | head); | |
207 | return p1->type == p2->type && p1->is_last_name == p2->is_last_name | |
36f5e1ff TH |
208 | && p1->domainname == p2->domainname |
209 | && p1->program == p2->program; | |
210 | } | |
211 | ||
26a2a1c9 | 212 | /** |
a238cf5b | 213 | * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list. |
26a2a1c9 | 214 | * |
a238cf5b TH |
215 | * @param: Pointer to "struct tomoyo_acl_param". |
216 | * @type: Type of this entry. | |
26a2a1c9 KT |
217 | * |
218 | * Returns 0 on success, negative value otherwise. | |
219 | */ | |
a238cf5b TH |
220 | int tomoyo_write_transition_control(struct tomoyo_acl_param *param, |
221 | const u8 type) | |
26a2a1c9 | 222 | { |
5448ec4f | 223 | struct tomoyo_transition_control e = { .type = type }; |
a238cf5b TH |
224 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
225 | char *program = param->data; | |
226 | char *domainname = strstr(program, " from "); | |
227 | if (domainname) { | |
228 | *domainname = '\0'; | |
229 | domainname += 6; | |
230 | } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP || | |
231 | type == TOMOYO_TRANSITION_CONTROL_KEEP) { | |
232 | domainname = program; | |
233 | program = NULL; | |
234 | } | |
0d2171d7 | 235 | if (program && strcmp(program, "any")) { |
5448ec4f TH |
236 | if (!tomoyo_correct_path(program)) |
237 | return -EINVAL; | |
238 | e.program = tomoyo_get_name(program); | |
239 | if (!e.program) | |
240 | goto out; | |
241 | } | |
0d2171d7 | 242 | if (domainname && strcmp(domainname, "any")) { |
5448ec4f TH |
243 | if (!tomoyo_correct_domain(domainname)) { |
244 | if (!tomoyo_correct_path(domainname)) | |
245 | goto out; | |
9e4b50e9 | 246 | e.is_last_name = true; |
5448ec4f | 247 | } |
9e4b50e9 TH |
248 | e.domainname = tomoyo_get_name(domainname); |
249 | if (!e.domainname) | |
ca0b7df3 | 250 | goto out; |
26a2a1c9 | 251 | } |
bd03a3e4 | 252 | param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; |
a238cf5b | 253 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 254 | tomoyo_same_transition_control); |
a238cf5b | 255 | out: |
9e4b50e9 TH |
256 | tomoyo_put_name(e.domainname); |
257 | tomoyo_put_name(e.program); | |
26a2a1c9 KT |
258 | return error; |
259 | } | |
260 | ||
26a2a1c9 | 261 | /** |
bd03a3e4 | 262 | * tomoyo_scan_transition - Try to find specific domain transition type. |
26a2a1c9 | 263 | * |
bd03a3e4 TH |
264 | * @list: Pointer to "struct list_head". |
265 | * @domainname: The name of current domain. | |
266 | * @program: The name of requested program. | |
267 | * @last_name: The last component of @domainname. | |
268 | * @type: One of values in "enum tomoyo_transition_type". | |
26a2a1c9 | 269 | * |
bd03a3e4 | 270 | * Returns true if found one, false otherwise. |
fdb8ebb7 TH |
271 | * |
272 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 273 | */ |
bd03a3e4 TH |
274 | static inline bool tomoyo_scan_transition |
275 | (const struct list_head *list, const struct tomoyo_path_info *domainname, | |
276 | const struct tomoyo_path_info *program, const char *last_name, | |
277 | const enum tomoyo_transition_type type) | |
26a2a1c9 | 278 | { |
5448ec4f | 279 | const struct tomoyo_transition_control *ptr; |
bd03a3e4 TH |
280 | list_for_each_entry_rcu(ptr, list, head.list) { |
281 | if (ptr->head.is_deleted || ptr->type != type) | |
282 | continue; | |
283 | if (ptr->domainname) { | |
284 | if (!ptr->is_last_name) { | |
285 | if (ptr->domainname != domainname) | |
286 | continue; | |
287 | } else { | |
5448ec4f | 288 | /* |
bd03a3e4 TH |
289 | * Use direct strcmp() since this is |
290 | * unlikely used. | |
5448ec4f | 291 | */ |
bd03a3e4 TH |
292 | if (strcmp(ptr->domainname->name, last_name)) |
293 | continue; | |
5448ec4f | 294 | } |
26a2a1c9 | 295 | } |
bd03a3e4 TH |
296 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) |
297 | continue; | |
298 | return true; | |
299 | } | |
300 | return false; | |
301 | } | |
302 | ||
303 | /** | |
304 | * tomoyo_transition_type - Get domain transition type. | |
305 | * | |
306 | * @ns: Pointer to "struct tomoyo_policy_namespace". | |
307 | * @domainname: The name of current domain. | |
308 | * @program: The name of requested program. | |
309 | * | |
310 | * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes | |
311 | * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if | |
312 | * executing @program reinitializes domain transition within that namespace, | |
313 | * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname , | |
314 | * others otherwise. | |
315 | * | |
316 | * Caller holds tomoyo_read_lock(). | |
317 | */ | |
318 | static enum tomoyo_transition_type tomoyo_transition_type | |
319 | (const struct tomoyo_policy_namespace *ns, | |
320 | const struct tomoyo_path_info *domainname, | |
321 | const struct tomoyo_path_info *program) | |
322 | { | |
323 | const char *last_name = tomoyo_last_word(domainname->name); | |
324 | enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET; | |
325 | while (type < TOMOYO_MAX_TRANSITION_TYPE) { | |
326 | const struct list_head * const list = | |
327 | &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; | |
328 | if (!tomoyo_scan_transition(list, domainname, program, | |
329 | last_name, type)) { | |
330 | type++; | |
331 | continue; | |
332 | } | |
333 | if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET && | |
334 | type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE) | |
335 | break; | |
336 | /* | |
337 | * Do not check for reset_domain if no_reset_domain matched. | |
338 | * Do not check for initialize_domain if no_initialize_domain | |
339 | * matched. | |
340 | */ | |
341 | type++; | |
342 | type++; | |
26a2a1c9 | 343 | } |
5448ec4f | 344 | return type; |
26a2a1c9 KT |
345 | } |
346 | ||
a238cf5b TH |
347 | /** |
348 | * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry. | |
349 | * | |
350 | * @a: Pointer to "struct tomoyo_acl_head". | |
351 | * @b: Pointer to "struct tomoyo_acl_head". | |
352 | * | |
353 | * Returns true if @a == @b, false otherwise. | |
354 | */ | |
e2bf6907 TH |
355 | static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a, |
356 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 357 | { |
a238cf5b TH |
358 | const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1), |
359 | head); | |
360 | const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2), | |
361 | head); | |
36f5e1ff TH |
362 | return p1->original_name == p2->original_name && |
363 | p1->aggregated_name == p2->aggregated_name; | |
364 | } | |
365 | ||
1084307c | 366 | /** |
a238cf5b | 367 | * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list. |
1084307c | 368 | * |
a238cf5b | 369 | * @param: Pointer to "struct tomoyo_acl_param". |
1084307c TH |
370 | * |
371 | * Returns 0 on success, negative value otherwise. | |
372 | * | |
373 | * Caller holds tomoyo_read_lock(). | |
374 | */ | |
a238cf5b | 375 | int tomoyo_write_aggregator(struct tomoyo_acl_param *param) |
1084307c | 376 | { |
e2bf6907 | 377 | struct tomoyo_aggregator e = { }; |
a238cf5b TH |
378 | int error = param->is_delete ? -ENOENT : -ENOMEM; |
379 | const char *original_name = tomoyo_read_token(param); | |
380 | const char *aggregated_name = tomoyo_read_token(param); | |
381 | if (!tomoyo_correct_word(original_name) || | |
75093152 | 382 | !tomoyo_correct_path(aggregated_name)) |
1084307c TH |
383 | return -EINVAL; |
384 | e.original_name = tomoyo_get_name(original_name); | |
385 | e.aggregated_name = tomoyo_get_name(aggregated_name); | |
386 | if (!e.original_name || !e.aggregated_name || | |
387 | e.aggregated_name->is_patterned) /* No patterns allowed. */ | |
388 | goto out; | |
bd03a3e4 | 389 | param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR]; |
a238cf5b | 390 | error = tomoyo_update_policy(&e.head, sizeof(e), param, |
e2bf6907 | 391 | tomoyo_same_aggregator); |
a238cf5b | 392 | out: |
1084307c TH |
393 | tomoyo_put_name(e.original_name); |
394 | tomoyo_put_name(e.aggregated_name); | |
395 | return error; | |
396 | } | |
397 | ||
26a2a1c9 | 398 | /** |
bd03a3e4 | 399 | * tomoyo_find_namespace - Find specified namespace. |
26a2a1c9 | 400 | * |
bd03a3e4 TH |
401 | * @name: Name of namespace to find. |
402 | * @len: Length of @name. | |
26a2a1c9 | 403 | * |
bd03a3e4 TH |
404 | * Returns pointer to "struct tomoyo_policy_namespace" if found, |
405 | * NULL otherwise. | |
fdb8ebb7 TH |
406 | * |
407 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 408 | */ |
bd03a3e4 TH |
409 | static struct tomoyo_policy_namespace *tomoyo_find_namespace |
410 | (const char *name, const unsigned int len) | |
26a2a1c9 | 411 | { |
bd03a3e4 TH |
412 | struct tomoyo_policy_namespace *ns; |
413 | list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { | |
414 | if (strncmp(name, ns->name, len) || | |
415 | (name[len] && name[len] != ' ')) | |
416 | continue; | |
417 | return ns; | |
418 | } | |
419 | return NULL; | |
420 | } | |
26a2a1c9 | 421 | |
bd03a3e4 TH |
422 | /** |
423 | * tomoyo_assign_namespace - Create a new namespace. | |
424 | * | |
425 | * @domainname: Name of namespace to create. | |
426 | * | |
427 | * Returns pointer to "struct tomoyo_policy_namespace" on success, | |
428 | * NULL otherwise. | |
429 | * | |
430 | * Caller holds tomoyo_read_lock(). | |
431 | */ | |
432 | struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname) | |
433 | { | |
434 | struct tomoyo_policy_namespace *ptr; | |
435 | struct tomoyo_policy_namespace *entry; | |
436 | const char *cp = domainname; | |
437 | unsigned int len = 0; | |
438 | while (*cp && *cp++ != ' ') | |
439 | len++; | |
440 | ptr = tomoyo_find_namespace(domainname, len); | |
441 | if (ptr) | |
442 | return ptr; | |
443 | if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname)) | |
ca0b7df3 | 444 | return NULL; |
bd03a3e4 TH |
445 | entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS); |
446 | if (!entry) | |
ca0b7df3 | 447 | return NULL; |
29282381 TH |
448 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
449 | goto out; | |
bd03a3e4 TH |
450 | ptr = tomoyo_find_namespace(domainname, len); |
451 | if (!ptr && tomoyo_memory_ok(entry)) { | |
452 | char *name = (char *) (entry + 1); | |
453 | ptr = entry; | |
454 | memmove(name, domainname, len); | |
455 | name[len] = '\0'; | |
456 | entry->name = name; | |
457 | tomoyo_init_policy_namespace(entry); | |
ca0b7df3 | 458 | entry = NULL; |
26a2a1c9 | 459 | } |
f737d95d | 460 | mutex_unlock(&tomoyo_policy_lock); |
bd03a3e4 | 461 | out: |
ca0b7df3 | 462 | kfree(entry); |
bd03a3e4 TH |
463 | return ptr; |
464 | } | |
465 | ||
466 | /** | |
467 | * tomoyo_namespace_jump - Check for namespace jump. | |
468 | * | |
469 | * @domainname: Name of domain. | |
470 | * | |
471 | * Returns true if namespace differs, false otherwise. | |
472 | */ | |
473 | static bool tomoyo_namespace_jump(const char *domainname) | |
474 | { | |
475 | const char *namespace = tomoyo_current_namespace()->name; | |
476 | const int len = strlen(namespace); | |
477 | return strncmp(domainname, namespace, len) || | |
478 | (domainname[len] && domainname[len] != ' '); | |
479 | } | |
480 | ||
481 | /** | |
482 | * tomoyo_assign_domain - Create a domain or a namespace. | |
483 | * | |
484 | * @domainname: The name of domain. | |
485 | * @transit: True if transit to domain found or created. | |
486 | * | |
487 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
488 | * | |
489 | * Caller holds tomoyo_read_lock(). | |
490 | */ | |
491 | struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, | |
492 | const bool transit) | |
493 | { | |
494 | struct tomoyo_domain_info e = { }; | |
495 | struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname); | |
496 | bool created = false; | |
497 | if (entry) { | |
498 | if (transit) { | |
499 | /* | |
500 | * Since namespace is created at runtime, profiles may | |
501 | * not be created by the moment the process transits to | |
502 | * that domain. Do not perform domain transition if | |
503 | * profile for that domain is not yet created. | |
504 | */ | |
505 | if (!entry->ns->profile_ptr[entry->profile]) | |
506 | return NULL; | |
507 | } | |
508 | return entry; | |
509 | } | |
510 | /* Requested domain does not exist. */ | |
511 | /* Don't create requested domain if domainname is invalid. */ | |
512 | if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 || | |
513 | !tomoyo_correct_domain(domainname)) | |
514 | return NULL; | |
515 | /* | |
516 | * Since definition of profiles and acl_groups may differ across | |
517 | * namespaces, do not inherit "use_profile" and "use_group" settings | |
518 | * by automatically creating requested domain upon domain transition. | |
519 | */ | |
520 | if (transit && tomoyo_namespace_jump(domainname)) | |
521 | return NULL; | |
522 | e.ns = tomoyo_assign_namespace(domainname); | |
523 | if (!e.ns) | |
524 | return NULL; | |
525 | /* | |
526 | * "use_profile" and "use_group" settings for automatically created | |
527 | * domains are inherited from current domain. These are 0 for manually | |
528 | * created domains. | |
529 | */ | |
530 | if (transit) { | |
531 | const struct tomoyo_domain_info *domain = tomoyo_domain(); | |
532 | e.profile = domain->profile; | |
533 | e.group = domain->group; | |
534 | } | |
535 | e.domainname = tomoyo_get_name(domainname); | |
536 | if (!e.domainname) | |
537 | return NULL; | |
538 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
539 | goto out; | |
540 | entry = tomoyo_find_domain(domainname); | |
541 | if (!entry) { | |
542 | entry = tomoyo_commit_ok(&e, sizeof(e)); | |
543 | if (entry) { | |
544 | INIT_LIST_HEAD(&entry->acl_info_list); | |
545 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); | |
546 | created = true; | |
547 | } | |
548 | } | |
549 | mutex_unlock(&tomoyo_policy_lock); | |
550 | out: | |
551 | tomoyo_put_name(e.domainname); | |
552 | if (entry && transit) { | |
553 | if (created) { | |
554 | struct tomoyo_request_info r; | |
555 | tomoyo_init_request_info(&r, entry, | |
556 | TOMOYO_MAC_FILE_EXECUTE); | |
557 | r.granted = false; | |
558 | tomoyo_write_log(&r, "use_profile %u\n", | |
559 | entry->profile); | |
560 | tomoyo_write_log(&r, "use_group %u\n", entry->group); | |
561 | } | |
562 | } | |
563 | return entry; | |
26a2a1c9 KT |
564 | } |
565 | ||
d58e0da8 TH |
566 | /** |
567 | * tomoyo_environ - Check permission for environment variable names. | |
568 | * | |
569 | * @ee: Pointer to "struct tomoyo_execve". | |
570 | * | |
571 | * Returns 0 on success, negative value otherwise. | |
572 | */ | |
573 | static int tomoyo_environ(struct tomoyo_execve *ee) | |
574 | { | |
575 | struct tomoyo_request_info *r = &ee->r; | |
576 | struct linux_binprm *bprm = ee->bprm; | |
577 | /* env_page.data is allocated by tomoyo_dump_page(). */ | |
578 | struct tomoyo_page_dump env_page = { }; | |
579 | char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */ | |
580 | int arg_len = 0; | |
581 | unsigned long pos = bprm->p; | |
582 | int offset = pos % PAGE_SIZE; | |
583 | int argv_count = bprm->argc; | |
584 | int envp_count = bprm->envc; | |
585 | int error = -ENOMEM; | |
586 | ||
587 | ee->r.type = TOMOYO_MAC_ENVIRON; | |
588 | ee->r.profile = r->domain->profile; | |
589 | ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile, | |
590 | TOMOYO_MAC_ENVIRON); | |
591 | if (!r->mode || !envp_count) | |
592 | return 0; | |
593 | arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
594 | if (!arg_ptr) | |
595 | goto out; | |
596 | while (error == -ENOMEM) { | |
597 | if (!tomoyo_dump_page(bprm, pos, &env_page)) | |
598 | goto out; | |
599 | pos += PAGE_SIZE - offset; | |
600 | /* Read. */ | |
601 | while (argv_count && offset < PAGE_SIZE) { | |
602 | if (!env_page.data[offset++]) | |
603 | argv_count--; | |
604 | } | |
605 | if (argv_count) { | |
606 | offset = 0; | |
607 | continue; | |
608 | } | |
609 | while (offset < PAGE_SIZE) { | |
610 | const unsigned char c = env_page.data[offset++]; | |
611 | ||
612 | if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) { | |
613 | if (c == '=') { | |
614 | arg_ptr[arg_len++] = '\0'; | |
615 | } else if (c == '\\') { | |
616 | arg_ptr[arg_len++] = '\\'; | |
617 | arg_ptr[arg_len++] = '\\'; | |
618 | } else if (c > ' ' && c < 127) { | |
619 | arg_ptr[arg_len++] = c; | |
620 | } else { | |
621 | arg_ptr[arg_len++] = '\\'; | |
622 | arg_ptr[arg_len++] = (c >> 6) + '0'; | |
623 | arg_ptr[arg_len++] | |
624 | = ((c >> 3) & 7) + '0'; | |
625 | arg_ptr[arg_len++] = (c & 7) + '0'; | |
626 | } | |
627 | } else { | |
628 | arg_ptr[arg_len] = '\0'; | |
629 | } | |
630 | if (c) | |
631 | continue; | |
632 | if (tomoyo_env_perm(r, arg_ptr)) { | |
633 | error = -EPERM; | |
634 | break; | |
635 | } | |
636 | if (!--envp_count) { | |
637 | error = 0; | |
638 | break; | |
639 | } | |
640 | arg_len = 0; | |
641 | } | |
642 | offset = 0; | |
643 | } | |
644 | out: | |
645 | if (r->mode != TOMOYO_CONFIG_ENFORCING) | |
646 | error = 0; | |
647 | kfree(env_page.data); | |
648 | kfree(arg_ptr); | |
649 | return error; | |
650 | } | |
651 | ||
26a2a1c9 KT |
652 | /** |
653 | * tomoyo_find_next_domain - Find a domain. | |
654 | * | |
56f8c9bc | 655 | * @bprm: Pointer to "struct linux_binprm". |
26a2a1c9 KT |
656 | * |
657 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
658 | * |
659 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 660 | */ |
56f8c9bc | 661 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
26a2a1c9 | 662 | { |
26a2a1c9 KT |
663 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
664 | struct tomoyo_domain_info *domain = NULL; | |
26a2a1c9 | 665 | const char *original_name = bprm->filename; |
26a2a1c9 | 666 | int retval = -ENOMEM; |
c8c57e84 | 667 | bool need_kfree = false; |
bd03a3e4 | 668 | bool reject_on_transition_failure = false; |
c8c57e84 | 669 | struct tomoyo_path_info rn = { }; /* real name */ |
97fb35e4 | 670 | struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS); |
d58e0da8 | 671 | |
97fb35e4 TH |
672 | if (!ee) |
673 | return -ENOMEM; | |
674 | ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
675 | if (!ee->tmp) { | |
676 | kfree(ee); | |
677 | return -ENOMEM; | |
678 | } | |
679 | /* ee->dump->data is allocated by tomoyo_dump_page(). */ | |
680 | tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE); | |
681 | ee->r.ee = ee; | |
682 | ee->bprm = bprm; | |
683 | ee->r.obj = &ee->obj; | |
684 | ee->obj.path1 = bprm->file->f_path; | |
17fcfbd9 | 685 | retry: |
c8c57e84 TH |
686 | if (need_kfree) { |
687 | kfree(rn.name); | |
688 | need_kfree = false; | |
689 | } | |
0617c7ff | 690 | /* Get symlink's pathname of program. */ |
26a2a1c9 | 691 | retval = -ENOENT; |
0617c7ff | 692 | rn.name = tomoyo_realpath_nofollow(original_name); |
c8c57e84 | 693 | if (!rn.name) |
26a2a1c9 | 694 | goto out; |
c8c57e84 TH |
695 | tomoyo_fill_path_info(&rn); |
696 | need_kfree = true; | |
697 | ||
1084307c TH |
698 | /* Check 'aggregator' directive. */ |
699 | { | |
e2bf6907 | 700 | struct tomoyo_aggregator *ptr; |
bd03a3e4 TH |
701 | struct list_head *list = |
702 | &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR]; | |
703 | /* Check 'aggregator' directive. */ | |
704 | list_for_each_entry_rcu(ptr, list, head.list) { | |
82e0f001 | 705 | if (ptr->head.is_deleted || |
1084307c TH |
706 | !tomoyo_path_matches_pattern(&rn, |
707 | ptr->original_name)) | |
708 | continue; | |
0617c7ff | 709 | kfree(rn.name); |
1084307c TH |
710 | need_kfree = false; |
711 | /* This is OK because it is read only. */ | |
712 | rn = *ptr->aggregated_name; | |
713 | break; | |
714 | } | |
715 | } | |
716 | ||
26a2a1c9 | 717 | /* Check execute permission. */ |
97fb35e4 | 718 | retval = tomoyo_path_permission(&ee->r, TOMOYO_TYPE_EXECUTE, &rn); |
17fcfbd9 TH |
719 | if (retval == TOMOYO_RETRY_REQUEST) |
720 | goto retry; | |
26a2a1c9 KT |
721 | if (retval < 0) |
722 | goto out; | |
484ca79c TH |
723 | /* |
724 | * To be able to specify domainnames with wildcards, use the | |
725 | * pathname specified in the policy (which may contain | |
726 | * wildcard) rather than the pathname passed to execve() | |
727 | * (which never contains wildcard). | |
728 | */ | |
97fb35e4 | 729 | if (ee->r.param.path.matched_path) { |
484ca79c TH |
730 | if (need_kfree) |
731 | kfree(rn.name); | |
732 | need_kfree = false; | |
733 | /* This is OK because it is read only. */ | |
97fb35e4 | 734 | rn = *ee->r.param.path.matched_path; |
484ca79c | 735 | } |
26a2a1c9 | 736 | |
5448ec4f | 737 | /* Calculate domain to transit to. */ |
bd03a3e4 TH |
738 | switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname, |
739 | &rn)) { | |
740 | case TOMOYO_TRANSITION_CONTROL_RESET: | |
741 | /* Transit to the root of specified namespace. */ | |
97fb35e4 | 742 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", rn.name); |
bd03a3e4 TH |
743 | /* |
744 | * Make do_execve() fail if domain transition across namespaces | |
745 | * has failed. | |
746 | */ | |
747 | reject_on_transition_failure = true; | |
748 | break; | |
5448ec4f | 749 | case TOMOYO_TRANSITION_CONTROL_INITIALIZE: |
bd03a3e4 | 750 | /* Transit to the child of current namespace's root. */ |
97fb35e4 | 751 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
bd03a3e4 | 752 | old_domain->ns->name, rn.name); |
5448ec4f TH |
753 | break; |
754 | case TOMOYO_TRANSITION_CONTROL_KEEP: | |
26a2a1c9 KT |
755 | /* Keep current domain. */ |
756 | domain = old_domain; | |
5448ec4f TH |
757 | break; |
758 | default: | |
759 | if (old_domain == &tomoyo_kernel_domain && | |
760 | !tomoyo_policy_loaded) { | |
761 | /* | |
762 | * Needn't to transit from kernel domain before | |
763 | * starting /sbin/init. But transit from kernel domain | |
764 | * if executing initializers because they might start | |
765 | * before /sbin/init. | |
766 | */ | |
767 | domain = old_domain; | |
768 | } else { | |
769 | /* Normal domain transition. */ | |
97fb35e4 | 770 | snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s", |
5448ec4f TH |
771 | old_domain->domainname->name, rn.name); |
772 | } | |
773 | break; | |
26a2a1c9 | 774 | } |
7c75964f | 775 | if (!domain) |
97fb35e4 | 776 | domain = tomoyo_assign_domain(ee->tmp, true); |
26a2a1c9 | 777 | if (domain) |
bd03a3e4 TH |
778 | retval = 0; |
779 | else if (reject_on_transition_failure) { | |
97fb35e4 TH |
780 | printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n", |
781 | ee->tmp); | |
bd03a3e4 | 782 | retval = -ENOMEM; |
97fb35e4 | 783 | } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING) |
bd03a3e4 TH |
784 | retval = -ENOMEM; |
785 | else { | |
786 | retval = 0; | |
2c47ab93 TH |
787 | if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) { |
788 | old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true; | |
97fb35e4 TH |
789 | ee->r.granted = false; |
790 | tomoyo_write_log(&ee->r, "%s", tomoyo_dif | |
2c47ab93 | 791 | [TOMOYO_DIF_TRANSITION_FAILED]); |
bd03a3e4 | 792 | printk(KERN_WARNING |
97fb35e4 | 793 | "ERROR: Domain '%s' not defined.\n", ee->tmp); |
bd03a3e4 TH |
794 | } |
795 | } | |
26a2a1c9 | 796 | out: |
56f8c9bc TH |
797 | if (!domain) |
798 | domain = old_domain; | |
ec8e6a4e TH |
799 | /* Update reference count on "struct tomoyo_domain_info". */ |
800 | atomic_inc(&domain->users); | |
56f8c9bc | 801 | bprm->cred->security = domain; |
c8c57e84 TH |
802 | if (need_kfree) |
803 | kfree(rn.name); | |
d58e0da8 TH |
804 | if (!retval) { |
805 | ee->r.domain = domain; | |
806 | retval = tomoyo_environ(ee); | |
807 | } | |
97fb35e4 TH |
808 | kfree(ee->tmp); |
809 | kfree(ee->dump.data); | |
810 | kfree(ee); | |
26a2a1c9 KT |
811 | return retval; |
812 | } | |
5b636857 TH |
813 | |
814 | /** | |
815 | * tomoyo_dump_page - Dump a page to buffer. | |
816 | * | |
817 | * @bprm: Pointer to "struct linux_binprm". | |
818 | * @pos: Location to dump. | |
819 | * @dump: Poiner to "struct tomoyo_page_dump". | |
820 | * | |
821 | * Returns true on success, false otherwise. | |
822 | */ | |
823 | bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos, | |
824 | struct tomoyo_page_dump *dump) | |
825 | { | |
826 | struct page *page; | |
d58e0da8 TH |
827 | |
828 | /* dump->data is released by tomoyo_find_next_domain(). */ | |
5b636857 TH |
829 | if (!dump->data) { |
830 | dump->data = kzalloc(PAGE_SIZE, GFP_NOFS); | |
831 | if (!dump->data) | |
832 | return false; | |
833 | } | |
834 | /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ | |
835 | #ifdef CONFIG_MMU | |
836 | if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) | |
837 | return false; | |
838 | #else | |
839 | page = bprm->page[pos / PAGE_SIZE]; | |
840 | #endif | |
841 | if (page != dump->page) { | |
842 | const unsigned int offset = pos % PAGE_SIZE; | |
843 | /* | |
844 | * Maybe kmap()/kunmap() should be used here. | |
845 | * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). | |
846 | * So do I. | |
847 | */ | |
848 | char *kaddr = kmap_atomic(page, KM_USER0); | |
d58e0da8 | 849 | |
5b636857 TH |
850 | dump->page = page; |
851 | memcpy(dump->data + offset, kaddr + offset, | |
852 | PAGE_SIZE - offset); | |
853 | kunmap_atomic(kaddr, KM_USER0); | |
854 | } | |
855 | /* Same with put_arg_page(page) in fs/exec.c */ | |
856 | #ifdef CONFIG_MMU | |
857 | put_page(page); | |
858 | #endif | |
859 | return true; | |
860 | } |