1 |
/* |
2 |
* fs/tomoyo_domain.c |
3 |
* |
4 |
* Implementation of the Domain-Based Mandatory Access Control. |
5 |
* |
6 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
7 |
* |
8 |
* Version: 1.6.2-rc 2008/06/12 |
9 |
* |
10 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
11 |
* See README.ccs for ChangeLog. |
12 |
* |
13 |
*/ |
14 |
|
15 |
#include <linux/ccs_common.h> |
16 |
#include <linux/tomoyo.h> |
17 |
#include <linux/realpath.h> |
18 |
#include <linux/highmem.h> |
19 |
#include <linux/binfmts.h> |
20 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
21 |
#include <linux/namei.h> |
22 |
#include <linux/mount.h> |
23 |
#endif |
24 |
|
25 |
/* For compatibility with older kernels. */ |
26 |
#ifndef for_each_process |
27 |
#define for_each_process for_each_task |
28 |
#endif |
29 |
|
30 |
/* Variables definitions.*/ |
31 |
|
32 |
/* The initial domain. */ |
33 |
struct domain_info KERNEL_DOMAIN; |
34 |
|
35 |
/* The list for "struct domain_info". */ |
36 |
LIST1_HEAD(domain_list); |
37 |
|
38 |
#ifdef CONFIG_TOMOYO |
39 |
|
40 |
/* Lock for appending domain's ACL. */ |
41 |
DEFINE_MUTEX(domain_acl_lock); |
42 |
|
43 |
/* Domain creation lock. */ |
44 |
static DEFINE_MUTEX(new_domain_assign_lock); |
45 |
|
46 |
/* Structure for "initialize_domain" and "no_initialize_domain" keyword. */ |
47 |
struct domain_initializer_entry { |
48 |
struct list1_head list; |
49 |
const struct path_info *domainname; /* This may be NULL */ |
50 |
const struct path_info *program; |
51 |
bool is_deleted; |
52 |
bool is_not; /* True if this entry is "no_initialize_domain". */ |
53 |
bool is_last_name; /* True if the domainname is ccs_get_last_name(). */ |
54 |
}; |
55 |
|
56 |
/* Structure for "keep_domain" and "no_keep_domain" keyword. */ |
57 |
struct domain_keeper_entry { |
58 |
struct list1_head list; |
59 |
const struct path_info *domainname; |
60 |
const struct path_info *program; /* This may be NULL */ |
61 |
bool is_deleted; |
62 |
bool is_not; /* True if this entry is "no_keep_domain". */ |
63 |
bool is_last_name; /* True if the domainname is ccs_get_last_name(). */ |
64 |
}; |
65 |
|
66 |
/* Structure for "aggregator" keyword. */ |
67 |
struct aggregator_entry { |
68 |
struct list1_head list; |
69 |
const struct path_info *original_name; |
70 |
const struct path_info *aggregated_name; |
71 |
bool is_deleted; |
72 |
}; |
73 |
|
74 |
/* Structure for "alias" keyword. */ |
75 |
struct alias_entry { |
76 |
struct list1_head list; |
77 |
const struct path_info *original_name; |
78 |
const struct path_info *aliased_name; |
79 |
bool is_deleted; |
80 |
}; |
81 |
|
82 |
/** |
83 |
* ccs_set_domain_flag - Set or clear domain's attribute flags. |
84 |
* |
85 |
* @domain: Pointer to "struct domain_info". |
86 |
* @is_delete: True if it is a delete request. |
87 |
* @flags: Flags to set or clear. |
88 |
* |
89 |
* Returns nothing. |
90 |
*/ |
91 |
void ccs_set_domain_flag(struct domain_info *domain, const bool is_delete, |
92 |
const u8 flags) |
93 |
{ |
94 |
mutex_lock(&new_domain_assign_lock); |
95 |
if (!is_delete) |
96 |
domain->flags |= flags; |
97 |
else |
98 |
domain->flags &= ~flags; |
99 |
mutex_unlock(&new_domain_assign_lock); |
100 |
} |
101 |
|
102 |
/** |
103 |
* ccs_get_last_name - Get last component of a domainname. |
104 |
* |
105 |
* @domain: Pointer to "struct domain_info". |
106 |
* |
107 |
* Returns the last component of the domainname. |
108 |
*/ |
109 |
const char *ccs_get_last_name(const struct domain_info *domain) |
110 |
{ |
111 |
const char *cp0 = domain->domainname->name, *cp1 = strrchr(cp0, ' '); |
112 |
if (cp1) |
113 |
return cp1 + 1; |
114 |
return cp0; |
115 |
} |
116 |
|
117 |
/** |
118 |
* ccs_add_domain_acl - Add the given ACL to the given domain. |
119 |
* |
120 |
* @domain: Pointer to "struct domain_info". May be NULL. |
121 |
* @acl: Pointer to "struct acl_info". |
122 |
* |
123 |
* Returns 0. |
124 |
*/ |
125 |
int ccs_add_domain_acl(struct domain_info *domain, struct acl_info *acl) |
126 |
{ |
127 |
if (domain) |
128 |
list1_add_tail_mb(&acl->list, &domain->acl_info_list); |
129 |
else |
130 |
acl->type &= ~ACL_DELETED; |
131 |
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
132 |
return 0; |
133 |
} |
134 |
|
135 |
/** |
136 |
* ccs_del_domain_acl - Delete the given ACL from the domain. |
137 |
* |
138 |
* @acl: Pointer to "struct acl_info". May be NULL. |
139 |
* |
140 |
* Returns 0. |
141 |
*/ |
142 |
int ccs_del_domain_acl(struct acl_info *acl) |
143 |
{ |
144 |
if (acl) |
145 |
acl->type |= ACL_DELETED; |
146 |
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
147 |
return 0; |
148 |
} |
149 |
|
150 |
/** |
151 |
* audit_execute_handler_log - Audit execute_handler log. |
152 |
* |
153 |
* @is_default: True if it is "execute_handler" log. |
154 |
* @handler: The realpath of the handler. |
155 |
* @bprm: Pointer to "struct linux_binprm". |
156 |
* |
157 |
* Returns 0 on success, negative value otherwise. |
158 |
*/ |
159 |
static int audit_execute_handler_log(const bool is_default, |
160 |
const char *handler, |
161 |
struct linux_binprm *bprm) |
162 |
{ |
163 |
char *buf; |
164 |
int len; |
165 |
int len2; |
166 |
u8 profile; |
167 |
u8 mode; |
168 |
if (ccs_can_save_audit_log(true) < 0) |
169 |
return -ENOMEM; |
170 |
len = strlen(handler) + 32; |
171 |
profile = current->domain_info->profile; |
172 |
mode = ccs_check_flags(CCS_TOMOYO_MAC_FOR_FILE); |
173 |
buf = ccs_init_audit_log(&len, profile, mode, bprm); |
174 |
if (!buf) |
175 |
return -ENOMEM; |
176 |
len2 = strlen(buf); |
177 |
snprintf(buf + len2, len - len2 - 1, "%s %s\n", |
178 |
is_default ? KEYWORD_EXECUTE_HANDLER : |
179 |
KEYWORD_DENIED_EXECUTE_HANDLER, handler); |
180 |
return ccs_write_audit_log(buf, true); |
181 |
} |
182 |
|
183 |
/** |
184 |
* audit_domain_creation_log - Audit domain creation log. |
185 |
* |
186 |
* @domainname: The name of newly created domain. |
187 |
* @mode: Access control mode used. |
188 |
* @profile: Profile number used. |
189 |
* |
190 |
* Returns 0 on success, negative value otherwise. |
191 |
*/ |
192 |
static int audit_domain_creation_log(const char *domainname, const u8 mode, |
193 |
const u8 profile) |
194 |
{ |
195 |
char *buf; |
196 |
char *cp; |
197 |
int len; |
198 |
int len2; |
199 |
if (ccs_can_save_audit_log(false) < 0) |
200 |
return -ENOMEM; |
201 |
len = strlen(domainname) + 32; |
202 |
buf = ccs_init_audit_log(&len, profile, mode, NULL); |
203 |
if (!buf) |
204 |
return -ENOMEM; |
205 |
cp = strchr(buf, '\n'); |
206 |
if (!cp) { |
207 |
ccs_free(buf); |
208 |
return -ENOMEM; |
209 |
} |
210 |
*++cp = '\0'; |
211 |
len2 = strlen(buf); |
212 |
snprintf(buf + len2, len - len2 - 1, "%s\nuse_profile %u\n", |
213 |
domainname, profile); |
214 |
return ccs_write_audit_log(buf, false); |
215 |
} |
216 |
|
217 |
/* The list for "struct domain_initializer_entry". */ |
218 |
static LIST1_HEAD(domain_initializer_list); |
219 |
|
220 |
/** |
221 |
* update_domain_initializer_entry - Update "struct domain_initializer_entry" list. |
222 |
* |
223 |
* @domainname: The name of domain. May be NULL. |
224 |
* @program: The name of program. |
225 |
* @is_not: True if it is "no_initialize_domain" entry. |
226 |
* @is_delete: True if it is a delete request. |
227 |
* |
228 |
* Returns 0 on success, negative value otherwise. |
229 |
*/ |
230 |
static int update_domain_initializer_entry(const char *domainname, |
231 |
const char *program, |
232 |
const bool is_not, |
233 |
const bool is_delete) |
234 |
{ |
235 |
struct domain_initializer_entry *new_entry; |
236 |
struct domain_initializer_entry *ptr; |
237 |
static DEFINE_MUTEX(lock); |
238 |
const struct path_info *saved_program; |
239 |
const struct path_info *saved_domainname = NULL; |
240 |
int error = -ENOMEM; |
241 |
bool is_last_name = false; |
242 |
if (!ccs_is_correct_path(program, 1, -1, -1, __func__)) |
243 |
return -EINVAL; /* No patterns allowed. */ |
244 |
if (domainname) { |
245 |
if (!ccs_is_domain_def(domainname) && |
246 |
ccs_is_correct_path(domainname, 1, -1, -1, __func__)) |
247 |
is_last_name = true; |
248 |
else if (!ccs_is_correct_domain(domainname, __func__)) |
249 |
return -EINVAL; |
250 |
saved_domainname = ccs_save_name(domainname); |
251 |
if (!saved_domainname) |
252 |
return -ENOMEM; |
253 |
} |
254 |
saved_program = ccs_save_name(program); |
255 |
if (!saved_program) |
256 |
return -ENOMEM; |
257 |
mutex_lock(&lock); |
258 |
list1_for_each_entry(ptr, &domain_initializer_list, list) { |
259 |
if (ptr->is_not != is_not || |
260 |
ptr->domainname != saved_domainname || |
261 |
ptr->program != saved_program) |
262 |
continue; |
263 |
ptr->is_deleted = is_delete; |
264 |
error = 0; |
265 |
goto out; |
266 |
} |
267 |
if (is_delete) { |
268 |
error = -ENOENT; |
269 |
goto out; |
270 |
} |
271 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
272 |
if (!new_entry) |
273 |
goto out; |
274 |
new_entry->domainname = saved_domainname; |
275 |
new_entry->program = saved_program; |
276 |
new_entry->is_not = is_not; |
277 |
new_entry->is_last_name = is_last_name; |
278 |
list1_add_tail_mb(&new_entry->list, &domain_initializer_list); |
279 |
error = 0; |
280 |
out: |
281 |
mutex_unlock(&lock); |
282 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
283 |
return error; |
284 |
} |
285 |
|
286 |
/** |
287 |
* ccs_read_domain_initializer_policy - Read "struct domain_initializer_entry" list. |
288 |
* |
289 |
* @head: Pointer to "struct ccs_io_buffer". |
290 |
* |
291 |
* Returns true on success, false otherwise. |
292 |
*/ |
293 |
bool ccs_read_domain_initializer_policy(struct ccs_io_buffer *head) |
294 |
{ |
295 |
struct list1_head *pos; |
296 |
list1_for_each_cookie(pos, head->read_var2, &domain_initializer_list) { |
297 |
const char *no; |
298 |
const char *from = ""; |
299 |
const char *domain = ""; |
300 |
struct domain_initializer_entry *ptr; |
301 |
ptr = list1_entry(pos, struct domain_initializer_entry, list); |
302 |
if (ptr->is_deleted) |
303 |
continue; |
304 |
no = ptr->is_not ? "no_" : ""; |
305 |
if (ptr->domainname) { |
306 |
from = " from "; |
307 |
domain = ptr->domainname->name; |
308 |
} |
309 |
if (!ccs_io_printf(head, |
310 |
"%s" KEYWORD_INITIALIZE_DOMAIN "%s%s%s\n", |
311 |
no, ptr->program->name, from, domain)) |
312 |
goto out; |
313 |
} |
314 |
return true; |
315 |
out: |
316 |
return false; |
317 |
} |
318 |
|
319 |
/** |
320 |
* ccs_write_domain_initializer_policy - Write "struct domain_initializer_entry" list. |
321 |
* |
322 |
* @data: String to parse. |
323 |
* @is_not: True if it is "no_initialize_domain" entry. |
324 |
* @is_delete: True if it is a delete request. |
325 |
* |
326 |
* Returns 0 on success, negative value otherwise. |
327 |
*/ |
328 |
int ccs_write_domain_initializer_policy(char *data, const bool is_not, |
329 |
const bool is_delete) |
330 |
{ |
331 |
char *cp = strstr(data, " from "); |
332 |
if (cp) { |
333 |
*cp = '\0'; |
334 |
return update_domain_initializer_entry(cp + 6, data, is_not, |
335 |
is_delete); |
336 |
} |
337 |
return update_domain_initializer_entry(NULL, data, is_not, is_delete); |
338 |
} |
339 |
|
340 |
/** |
341 |
* is_domain_initializer - Check whether the given program causes domainname reinitialization. |
342 |
* |
343 |
* @domainname: The name of domain. |
344 |
* @program: The name of program. |
345 |
* @last_name: The last component of @domainname. |
346 |
* |
347 |
* Returns true if executing @program reinitializes domain transition, |
348 |
* false otherwise. |
349 |
*/ |
350 |
static bool is_domain_initializer(const struct path_info *domainname, |
351 |
const struct path_info *program, |
352 |
const struct path_info *last_name) |
353 |
{ |
354 |
struct domain_initializer_entry *ptr; |
355 |
bool flag = false; |
356 |
list1_for_each_entry(ptr, &domain_initializer_list, list) { |
357 |
if (ptr->is_deleted) |
358 |
continue; |
359 |
if (ptr->domainname) { |
360 |
if (!ptr->is_last_name) { |
361 |
if (ptr->domainname != domainname) |
362 |
continue; |
363 |
} else { |
364 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
365 |
continue; |
366 |
} |
367 |
} |
368 |
if (ccs_pathcmp(ptr->program, program)) |
369 |
continue; |
370 |
if (ptr->is_not) |
371 |
return false; |
372 |
flag = true; |
373 |
} |
374 |
return flag; |
375 |
} |
376 |
|
377 |
/* The list for "struct domain_keeper_entry". */ |
378 |
static LIST1_HEAD(domain_keeper_list); |
379 |
|
380 |
/** |
381 |
* update_domain_keeper_entry - Update "struct domain_keeper_entry" list. |
382 |
* |
383 |
* @domainname: The name of domain. |
384 |
* @program: The name of program. May be NULL. |
385 |
* @is_not: True if it is "no_keep_domain" entry. |
386 |
* @is_delete: True if it is a delete request. |
387 |
* |
388 |
* Returns 0 on success, negative value otherwise. |
389 |
*/ |
390 |
static int update_domain_keeper_entry(const char *domainname, |
391 |
const char *program, |
392 |
const bool is_not, const bool is_delete) |
393 |
{ |
394 |
struct domain_keeper_entry *new_entry; |
395 |
struct domain_keeper_entry *ptr; |
396 |
const struct path_info *saved_domainname; |
397 |
const struct path_info *saved_program = NULL; |
398 |
static DEFINE_MUTEX(lock); |
399 |
int error = -ENOMEM; |
400 |
bool is_last_name = false; |
401 |
if (!ccs_is_domain_def(domainname) && |
402 |
ccs_is_correct_path(domainname, 1, -1, -1, __func__)) |
403 |
is_last_name = true; |
404 |
else if (!ccs_is_correct_domain(domainname, __func__)) |
405 |
return -EINVAL; |
406 |
if (program) { |
407 |
if (!ccs_is_correct_path(program, 1, -1, -1, __func__)) |
408 |
return -EINVAL; |
409 |
saved_program = ccs_save_name(program); |
410 |
if (!saved_program) |
411 |
return -ENOMEM; |
412 |
} |
413 |
saved_domainname = ccs_save_name(domainname); |
414 |
if (!saved_domainname) |
415 |
return -ENOMEM; |
416 |
mutex_lock(&lock); |
417 |
list1_for_each_entry(ptr, &domain_keeper_list, list) { |
418 |
if (ptr->is_not != is_not || |
419 |
ptr->domainname != saved_domainname || |
420 |
ptr->program != saved_program) |
421 |
continue; |
422 |
ptr->is_deleted = is_delete; |
423 |
error = 0; |
424 |
goto out; |
425 |
} |
426 |
if (is_delete) { |
427 |
error = -ENOENT; |
428 |
goto out; |
429 |
} |
430 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
431 |
if (!new_entry) |
432 |
goto out; |
433 |
new_entry->domainname = saved_domainname; |
434 |
new_entry->program = saved_program; |
435 |
new_entry->is_not = is_not; |
436 |
new_entry->is_last_name = is_last_name; |
437 |
list1_add_tail_mb(&new_entry->list, &domain_keeper_list); |
438 |
error = 0; |
439 |
out: |
440 |
mutex_unlock(&lock); |
441 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
442 |
return error; |
443 |
} |
444 |
|
445 |
/** |
446 |
* ccs_write_domain_keeper_policy - Write "struct domain_keeper_entry" list. |
447 |
* |
448 |
* @data: String to parse. |
449 |
* @is_not: True if it is "no_keep_domain" entry. |
450 |
* @is_delete: True if it is a delete request. |
451 |
* |
452 |
*/ |
453 |
int ccs_write_domain_keeper_policy(char *data, const bool is_not, |
454 |
const bool is_delete) |
455 |
{ |
456 |
char *cp = strstr(data, " from "); |
457 |
if (cp) { |
458 |
*cp = '\0'; |
459 |
return update_domain_keeper_entry(cp + 6, data, |
460 |
is_not, is_delete); |
461 |
} |
462 |
return update_domain_keeper_entry(data, NULL, is_not, is_delete); |
463 |
} |
464 |
|
465 |
/** |
466 |
* ccs_read_domain_keeper_policy - Read "struct domain_keeper_entry" list. |
467 |
* |
468 |
* @head: Pointer to "struct ccs_io_buffer". |
469 |
* |
470 |
* Returns true on success, false otherwise. |
471 |
*/ |
472 |
bool ccs_read_domain_keeper_policy(struct ccs_io_buffer *head) |
473 |
{ |
474 |
struct list1_head *pos; |
475 |
list1_for_each_cookie(pos, head->read_var2, &domain_keeper_list) { |
476 |
struct domain_keeper_entry *ptr; |
477 |
const char *no; |
478 |
const char *from = ""; |
479 |
const char *program = ""; |
480 |
ptr = list1_entry(pos, struct domain_keeper_entry, list); |
481 |
if (ptr->is_deleted) |
482 |
continue; |
483 |
no = ptr->is_not ? "no_" : ""; |
484 |
if (ptr->program) { |
485 |
from = " from "; |
486 |
program = ptr->program->name; |
487 |
} |
488 |
if (!ccs_io_printf(head, |
489 |
"%s" KEYWORD_KEEP_DOMAIN "%s%s%s\n", no, |
490 |
program, from, ptr->domainname->name)) |
491 |
goto out; |
492 |
} |
493 |
return true; |
494 |
out: |
495 |
return false; |
496 |
} |
497 |
|
498 |
/** |
499 |
* is_domain_keeper - Check whether the given program causes domain transition suppression. |
500 |
* |
501 |
* @domainname: The name of domain. |
502 |
* @program: The name of program. |
503 |
* @last_name: The last component of @domainname. |
504 |
* |
505 |
* Returns true if executing @program supresses domain transition, |
506 |
* false otherwise. |
507 |
*/ |
508 |
static bool is_domain_keeper(const struct path_info *domainname, |
509 |
const struct path_info *program, |
510 |
const struct path_info *last_name) |
511 |
{ |
512 |
struct domain_keeper_entry *ptr; |
513 |
bool flag = false; |
514 |
list1_for_each_entry(ptr, &domain_keeper_list, list) { |
515 |
if (ptr->is_deleted) |
516 |
continue; |
517 |
if (!ptr->is_last_name) { |
518 |
if (ptr->domainname != domainname) |
519 |
continue; |
520 |
} else { |
521 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
522 |
continue; |
523 |
} |
524 |
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
525 |
continue; |
526 |
if (ptr->is_not) |
527 |
return false; |
528 |
flag = true; |
529 |
} |
530 |
return flag; |
531 |
} |
532 |
|
533 |
/* The list for "struct alias_entry". */ |
534 |
static LIST1_HEAD(alias_list); |
535 |
|
536 |
/** |
537 |
* update_alias_entry - Update "struct alias_entry" list. |
538 |
* |
539 |
* @original_name: The original program's real name. |
540 |
* @aliased_name: The symbolic program's symbolic link's name. |
541 |
* @is_delete: True if it is a delete request. |
542 |
* |
543 |
* Returns 0 on success, negative value otherwise. |
544 |
*/ |
545 |
static int update_alias_entry(const char *original_name, |
546 |
const char *aliased_name, |
547 |
const bool is_delete) |
548 |
{ |
549 |
struct alias_entry *new_entry; |
550 |
struct alias_entry *ptr; |
551 |
static DEFINE_MUTEX(lock); |
552 |
const struct path_info *saved_original_name; |
553 |
const struct path_info *saved_aliased_name; |
554 |
int error = -ENOMEM; |
555 |
if (!ccs_is_correct_path(original_name, 1, -1, -1, __func__) || |
556 |
!ccs_is_correct_path(aliased_name, 1, -1, -1, __func__)) |
557 |
return -EINVAL; /* No patterns allowed. */ |
558 |
saved_original_name = ccs_save_name(original_name); |
559 |
saved_aliased_name = ccs_save_name(aliased_name); |
560 |
if (!saved_original_name || !saved_aliased_name) |
561 |
return -ENOMEM; |
562 |
mutex_lock(&lock); |
563 |
list1_for_each_entry(ptr, &alias_list, list) { |
564 |
if (ptr->original_name != saved_original_name || |
565 |
ptr->aliased_name != saved_aliased_name) |
566 |
continue; |
567 |
ptr->is_deleted = is_delete; |
568 |
error = 0; |
569 |
goto out; |
570 |
} |
571 |
if (is_delete) { |
572 |
error = -ENOENT; |
573 |
goto out; |
574 |
} |
575 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
576 |
if (!new_entry) |
577 |
goto out; |
578 |
new_entry->original_name = saved_original_name; |
579 |
new_entry->aliased_name = saved_aliased_name; |
580 |
list1_add_tail_mb(&new_entry->list, &alias_list); |
581 |
error = 0; |
582 |
out: |
583 |
mutex_unlock(&lock); |
584 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
585 |
return error; |
586 |
} |
587 |
|
588 |
/** |
589 |
* ccs_read_alias_policy - Read "struct alias_entry" list. |
590 |
* |
591 |
* @head: Pointer to "struct ccs_io_buffer". |
592 |
* |
593 |
* Returns true on success, false otherwise. |
594 |
*/ |
595 |
bool ccs_read_alias_policy(struct ccs_io_buffer *head) |
596 |
{ |
597 |
struct list1_head *pos; |
598 |
list1_for_each_cookie(pos, head->read_var2, &alias_list) { |
599 |
struct alias_entry *ptr; |
600 |
ptr = list1_entry(pos, struct alias_entry, list); |
601 |
if (ptr->is_deleted) |
602 |
continue; |
603 |
if (!ccs_io_printf(head, KEYWORD_ALIAS "%s %s\n", |
604 |
ptr->original_name->name, |
605 |
ptr->aliased_name->name)) |
606 |
goto out; |
607 |
} |
608 |
return true; |
609 |
out: |
610 |
return false; |
611 |
} |
612 |
|
613 |
/** |
614 |
* ccs_write_alias_policy - Write "struct alias_entry" list. |
615 |
* |
616 |
* @data: String to parse. |
617 |
* @is_delete: True if it is a delete request. |
618 |
* |
619 |
* Returns 0 on success, negative value otherwise. |
620 |
*/ |
621 |
int ccs_write_alias_policy(char *data, const bool is_delete) |
622 |
{ |
623 |
char *cp = strchr(data, ' '); |
624 |
if (!cp) |
625 |
return -EINVAL; |
626 |
*cp++ = '\0'; |
627 |
return update_alias_entry(data, cp, is_delete); |
628 |
} |
629 |
|
630 |
/* The list for "struct aggregator_entry". */ |
631 |
static LIST1_HEAD(aggregator_list); |
632 |
|
633 |
/** |
634 |
* update_aggregator_entry - Update "struct aggregator_entry" list. |
635 |
* |
636 |
* @original_name: The original program's name. |
637 |
* @aggregated_name: The aggregated program's name. |
638 |
* @is_delete: True if it is a delete request. |
639 |
* |
640 |
* Returns 0 on success, negative value otherwise. |
641 |
*/ |
642 |
static int update_aggregator_entry(const char *original_name, |
643 |
const char *aggregated_name, |
644 |
const bool is_delete) |
645 |
{ |
646 |
struct aggregator_entry *new_entry; |
647 |
struct aggregator_entry *ptr; |
648 |
static DEFINE_MUTEX(lock); |
649 |
const struct path_info *saved_original_name; |
650 |
const struct path_info *saved_aggregated_name; |
651 |
int error = -ENOMEM; |
652 |
if (!ccs_is_correct_path(original_name, 1, 0, -1, __func__) || |
653 |
!ccs_is_correct_path(aggregated_name, 1, -1, -1, __func__)) |
654 |
return -EINVAL; |
655 |
saved_original_name = ccs_save_name(original_name); |
656 |
saved_aggregated_name = ccs_save_name(aggregated_name); |
657 |
if (!saved_original_name || !saved_aggregated_name) |
658 |
return -ENOMEM; |
659 |
mutex_lock(&lock); |
660 |
list1_for_each_entry(ptr, &aggregator_list, list) { |
661 |
if (ptr->original_name != saved_original_name || |
662 |
ptr->aggregated_name != saved_aggregated_name) |
663 |
continue; |
664 |
ptr->is_deleted = is_delete; |
665 |
error = 0; |
666 |
goto out; |
667 |
} |
668 |
if (is_delete) { |
669 |
error = -ENOENT; |
670 |
goto out; |
671 |
} |
672 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
673 |
if (!new_entry) |
674 |
goto out; |
675 |
new_entry->original_name = saved_original_name; |
676 |
new_entry->aggregated_name = saved_aggregated_name; |
677 |
list1_add_tail_mb(&new_entry->list, &aggregator_list); |
678 |
error = 0; |
679 |
out: |
680 |
mutex_unlock(&lock); |
681 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
682 |
return error; |
683 |
} |
684 |
|
685 |
/** |
686 |
* ccs_read_aggregator_policy - Read "struct aggregator_entry" list. |
687 |
* |
688 |
* @head: Pointer to "struct ccs_io_buffer". |
689 |
* |
690 |
* Returns true on success, false otherwise. |
691 |
*/ |
692 |
bool ccs_read_aggregator_policy(struct ccs_io_buffer *head) |
693 |
{ |
694 |
struct list1_head *pos; |
695 |
list1_for_each_cookie(pos, head->read_var2, &aggregator_list) { |
696 |
struct aggregator_entry *ptr; |
697 |
ptr = list1_entry(pos, struct aggregator_entry, list); |
698 |
if (ptr->is_deleted) |
699 |
continue; |
700 |
if (!ccs_io_printf(head, KEYWORD_AGGREGATOR "%s %s\n", |
701 |
ptr->original_name->name, |
702 |
ptr->aggregated_name->name)) |
703 |
goto out; |
704 |
} |
705 |
return true; |
706 |
out: |
707 |
return false; |
708 |
} |
709 |
|
710 |
/** |
711 |
* ccs_write_aggregator_policy - Write "struct aggregator_entry" list. |
712 |
* |
713 |
* @data: String to parse. |
714 |
* @is_delete: True if it is a delete request. |
715 |
* |
716 |
* Returns 0 on success, negative value otherwise. |
717 |
*/ |
718 |
int ccs_write_aggregator_policy(char *data, const bool is_delete) |
719 |
{ |
720 |
char *cp = strchr(data, ' '); |
721 |
if (!cp) |
722 |
return -EINVAL; |
723 |
*cp++ = '\0'; |
724 |
return update_aggregator_entry(data, cp, is_delete); |
725 |
} |
726 |
|
727 |
/* Domain create/delete/undelete handler. */ |
728 |
|
729 |
/* #define DEBUG_DOMAIN_UNDELETE */ |
730 |
|
731 |
/** |
732 |
* ccs_delete_domain - Delete a domain. |
733 |
* |
734 |
* @domainname: The name of domain. |
735 |
* |
736 |
* Returns 0. |
737 |
*/ |
738 |
int ccs_delete_domain(char *domainname) |
739 |
{ |
740 |
struct domain_info *domain; |
741 |
struct path_info name; |
742 |
name.name = domainname; |
743 |
ccs_fill_path_info(&name); |
744 |
mutex_lock(&new_domain_assign_lock); |
745 |
#ifdef DEBUG_DOMAIN_UNDELETE |
746 |
printk(KERN_DEBUG "ccs_delete_domain %s\n", domainname); |
747 |
list1_for_each_entry(domain, &domain_list, list) { |
748 |
if (ccs_pathcmp(domain->domainname, &name)) |
749 |
continue; |
750 |
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); |
751 |
} |
752 |
#endif |
753 |
/* Is there an active domain? */ |
754 |
list1_for_each_entry(domain, &domain_list, list) { |
755 |
struct domain_info *domain2; |
756 |
/* Never delete KERNEL_DOMAIN */ |
757 |
if (domain == &KERNEL_DOMAIN) |
758 |
continue; |
759 |
if (domain->is_deleted || |
760 |
ccs_pathcmp(domain->domainname, &name)) |
761 |
continue; |
762 |
/* Mark already deleted domains as non undeletable. */ |
763 |
list1_for_each_entry(domain2, &domain_list, list) { |
764 |
if (!domain2->is_deleted || |
765 |
ccs_pathcmp(domain2->domainname, &name)) |
766 |
continue; |
767 |
#ifdef DEBUG_DOMAIN_UNDELETE |
768 |
if (domain2->is_deleted != 255) |
769 |
printk(KERN_DEBUG |
770 |
"Marked %p as non undeletable\n", |
771 |
domain2); |
772 |
#endif |
773 |
domain2->is_deleted = 255; |
774 |
} |
775 |
/* Delete and mark active domain as undeletable. */ |
776 |
domain->is_deleted = 1; |
777 |
#ifdef DEBUG_DOMAIN_UNDELETE |
778 |
printk(KERN_DEBUG "Marked %p as undeletable\n", domain); |
779 |
#endif |
780 |
break; |
781 |
} |
782 |
mutex_unlock(&new_domain_assign_lock); |
783 |
return 0; |
784 |
} |
785 |
|
786 |
/** |
787 |
* ccs_undelete_domain - Undelete a domain. |
788 |
* |
789 |
* @domainname: The name of domain. |
790 |
* |
791 |
* Returns pointer to "struct domain_info" on success, NULL otherwise. |
792 |
*/ |
793 |
struct domain_info *ccs_undelete_domain(const char *domainname) |
794 |
{ |
795 |
struct domain_info *domain; |
796 |
struct domain_info *candidate_domain = NULL; |
797 |
struct path_info name; |
798 |
name.name = domainname; |
799 |
ccs_fill_path_info(&name); |
800 |
mutex_lock(&new_domain_assign_lock); |
801 |
#ifdef DEBUG_DOMAIN_UNDELETE |
802 |
printk(KERN_DEBUG "ccs_undelete_domain %s\n", domainname); |
803 |
list1_for_each_entry(domain, &domain_list, list) { |
804 |
if (ccs_pathcmp(domain->domainname, &name)) |
805 |
continue; |
806 |
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); |
807 |
} |
808 |
#endif |
809 |
list1_for_each_entry(domain, &domain_list, list) { |
810 |
if (ccs_pathcmp(&name, domain->domainname)) |
811 |
continue; |
812 |
if (!domain->is_deleted) { |
813 |
/* This domain is active. I can't undelete. */ |
814 |
candidate_domain = NULL; |
815 |
#ifdef DEBUG_DOMAIN_UNDELETE |
816 |
printk(KERN_DEBUG "%p is active. I can't undelete.\n", |
817 |
domain); |
818 |
#endif |
819 |
break; |
820 |
} |
821 |
/* Is this domain undeletable? */ |
822 |
if (domain->is_deleted == 1) |
823 |
candidate_domain = domain; |
824 |
} |
825 |
if (candidate_domain) { |
826 |
candidate_domain->is_deleted = 0; |
827 |
#ifdef DEBUG_DOMAIN_UNDELETE |
828 |
printk(KERN_DEBUG "%p was undeleted.\n", candidate_domain); |
829 |
#endif |
830 |
} |
831 |
mutex_unlock(&new_domain_assign_lock); |
832 |
return candidate_domain; |
833 |
} |
834 |
|
835 |
/** |
836 |
* ccs_find_or_assign_new_domain - Create a domain. |
837 |
* |
838 |
* @domainname: The name of domain. |
839 |
* @profile: Profile number to assign if the domain was newly created. |
840 |
* |
841 |
* Returns pointer to "struct domain_info" on success, NULL otherwise. |
842 |
*/ |
843 |
struct domain_info *ccs_find_or_assign_new_domain(const char *domainname, |
844 |
const u8 profile) |
845 |
{ |
846 |
struct domain_info *domain = NULL; |
847 |
const struct path_info *saved_domainname; |
848 |
mutex_lock(&new_domain_assign_lock); |
849 |
domain = ccs_find_domain(domainname); |
850 |
if (domain) |
851 |
goto out; |
852 |
if (!ccs_is_correct_domain(domainname, __func__)) |
853 |
goto out; |
854 |
saved_domainname = ccs_save_name(domainname); |
855 |
if (!saved_domainname) |
856 |
goto out; |
857 |
/* Can I reuse memory of deleted domain? */ |
858 |
list1_for_each_entry(domain, &domain_list, list) { |
859 |
struct task_struct *p; |
860 |
struct acl_info *ptr; |
861 |
bool flag; |
862 |
if (!domain->is_deleted || |
863 |
domain->domainname != saved_domainname) |
864 |
continue; |
865 |
flag = false; |
866 |
/***** CRITICAL SECTION START *****/ |
867 |
read_lock(&tasklist_lock); |
868 |
for_each_process(p) { |
869 |
if (p->domain_info != domain) |
870 |
continue; |
871 |
flag = true; |
872 |
break; |
873 |
} |
874 |
read_unlock(&tasklist_lock); |
875 |
/***** CRITICAL SECTION END *****/ |
876 |
if (flag) |
877 |
continue; |
878 |
#ifdef DEBUG_DOMAIN_UNDELETE |
879 |
printk(KERN_DEBUG "Reusing %p %s\n", domain, |
880 |
domain->domainname->name); |
881 |
#endif |
882 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
883 |
ptr->type |= ACL_DELETED; |
884 |
} |
885 |
/* |
886 |
* Don't use ccs_set_domain_flag() because |
887 |
* new_domain_assign_lock is held. |
888 |
*/ |
889 |
domain->flags = 0; |
890 |
domain->profile = profile; |
891 |
domain->quota_warned = false; |
892 |
mb(); /* Avoid out-of-order execution. */ |
893 |
domain->is_deleted = 0; |
894 |
goto out; |
895 |
} |
896 |
/* No memory reusable. Create using new memory. */ |
897 |
domain = ccs_alloc_element(sizeof(*domain)); |
898 |
if (domain) { |
899 |
INIT_LIST1_HEAD(&domain->acl_info_list); |
900 |
domain->domainname = saved_domainname; |
901 |
domain->profile = profile; |
902 |
list1_add_tail_mb(&domain->list, &domain_list); |
903 |
} |
904 |
out: |
905 |
mutex_unlock(&new_domain_assign_lock); |
906 |
return domain; |
907 |
} |
908 |
|
909 |
/** |
910 |
* get_argv0 - Get argv[0]. |
911 |
* |
912 |
* @bprm: Pointer to "struct linux_binprm". |
913 |
* @tmp: Buffer for temporal use. |
914 |
* |
915 |
* Returns true on success, false otherwise. |
916 |
*/ |
917 |
static bool get_argv0(struct linux_binprm *bprm, struct ccs_page_buffer *tmp) |
918 |
{ |
919 |
char *arg_ptr = tmp->buffer; |
920 |
int arg_len = 0; |
921 |
unsigned long pos = bprm->p; |
922 |
int i = pos / PAGE_SIZE; |
923 |
int offset = pos % PAGE_SIZE; |
924 |
bool done = false; |
925 |
if (!bprm->argc) |
926 |
goto out; |
927 |
while (1) { |
928 |
struct page *page; |
929 |
const char *kaddr; |
930 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
931 |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, |
932 |
NULL) <= 0) |
933 |
goto out; |
934 |
pos += PAGE_SIZE - offset; |
935 |
#else |
936 |
page = bprm->page[i]; |
937 |
#endif |
938 |
/* Map. */ |
939 |
kaddr = kmap(page); |
940 |
if (!kaddr) { /* Mapping failed. */ |
941 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
942 |
put_page(page); |
943 |
#endif |
944 |
goto out; |
945 |
} |
946 |
/* Read. */ |
947 |
while (offset < PAGE_SIZE) { |
948 |
const unsigned char c = kaddr[offset++]; |
949 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
950 |
if (c == '\\') { |
951 |
arg_ptr[arg_len++] = '\\'; |
952 |
arg_ptr[arg_len++] = '\\'; |
953 |
} else if (c == '/') { |
954 |
arg_len = 0; |
955 |
} else if (c > ' ' && c < 127) { |
956 |
arg_ptr[arg_len++] = c; |
957 |
} else { |
958 |
arg_ptr[arg_len++] = '\\'; |
959 |
arg_ptr[arg_len++] = (c >> 6) + '0'; |
960 |
arg_ptr[arg_len++] |
961 |
= ((c >> 3) & 7) + '0'; |
962 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
963 |
} |
964 |
} else { |
965 |
arg_ptr[arg_len] = '\0'; |
966 |
done = true; |
967 |
break; |
968 |
} |
969 |
} |
970 |
/* Unmap. */ |
971 |
kunmap(page); |
972 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
973 |
put_page(page); |
974 |
#endif |
975 |
i++; |
976 |
offset = 0; |
977 |
if (done) |
978 |
break; |
979 |
} |
980 |
return true; |
981 |
out: |
982 |
return false; |
983 |
} |
984 |
|
985 |
/** |
986 |
* find_next_domain - Find a domain. |
987 |
* |
988 |
* @bprm: Pointer to "struct linux_binprm". |
989 |
* @next_domain: Pointer to pointer to "struct domain_info". |
990 |
* @path_to_verify: Pathname to verify. May be NULL. |
991 |
* @tmp: Buffer for temporal use. |
992 |
* |
993 |
* Returns 0 on success, negative value otherwise. |
994 |
*/ |
995 |
static int find_next_domain(struct linux_binprm *bprm, |
996 |
struct domain_info **next_domain, |
997 |
const struct path_info *path_to_verify, |
998 |
struct ccs_page_buffer *tmp) |
999 |
{ |
1000 |
/* |
1001 |
* This function assumes that the size of buffer returned by |
1002 |
* ccs_realpath() = CCS_MAX_PATHNAME_LEN. |
1003 |
*/ |
1004 |
struct domain_info *old_domain = current->domain_info; |
1005 |
struct domain_info *domain = NULL; |
1006 |
const char *old_domain_name = old_domain->domainname->name; |
1007 |
const char *original_name = bprm->filename; |
1008 |
char *new_domain_name = NULL; |
1009 |
char *real_program_name = NULL; |
1010 |
char *symlink_program_name = NULL; |
1011 |
const u8 mode = ccs_check_flags(CCS_TOMOYO_MAC_FOR_FILE); |
1012 |
const bool is_enforce = (mode == 3); |
1013 |
int retval; |
1014 |
struct path_info r; /* real name */ |
1015 |
struct path_info s; /* symlink name */ |
1016 |
struct path_info l; /* last name */ |
1017 |
|
1018 |
{ |
1019 |
/* |
1020 |
* Built-in initializers. This is needed because policies are |
1021 |
* not loaded until starting /sbin/init. |
1022 |
*/ |
1023 |
static bool first = true; |
1024 |
if (first) { |
1025 |
update_domain_initializer_entry(NULL, "/sbin/hotplug", |
1026 |
false, false); |
1027 |
update_domain_initializer_entry(NULL, "/sbin/modprobe", |
1028 |
false, false); |
1029 |
first = false; |
1030 |
} |
1031 |
} |
1032 |
|
1033 |
/* Get ccs_realpath of program. */ |
1034 |
retval = -ENOENT; /* I hope ccs_realpath() won't fail with -ENOMEM. */ |
1035 |
real_program_name = ccs_realpath(original_name); |
1036 |
if (!real_program_name) |
1037 |
goto out; |
1038 |
/* Get ccs_realpath of symbolic link. */ |
1039 |
symlink_program_name = ccs_realpath_nofollow(original_name); |
1040 |
if (!symlink_program_name) |
1041 |
goto out; |
1042 |
|
1043 |
r.name = real_program_name; |
1044 |
ccs_fill_path_info(&r); |
1045 |
s.name = symlink_program_name; |
1046 |
ccs_fill_path_info(&s); |
1047 |
l.name = ccs_get_last_name(old_domain); |
1048 |
ccs_fill_path_info(&l); |
1049 |
|
1050 |
if (path_to_verify) { |
1051 |
if (ccs_pathcmp(&r, path_to_verify)) { |
1052 |
/* Failed to verify execute handler. */ |
1053 |
static u8 counter = 20; |
1054 |
if (counter) { |
1055 |
counter--; |
1056 |
printk(KERN_WARNING "Failed to verify: %s\n", |
1057 |
path_to_verify->name); |
1058 |
} |
1059 |
goto out; |
1060 |
} |
1061 |
goto calculate_domain; |
1062 |
} |
1063 |
|
1064 |
/* Check 'alias' directive. */ |
1065 |
if (ccs_pathcmp(&r, &s)) { |
1066 |
struct alias_entry *ptr; |
1067 |
/* Is this program allowed to be called via symbolic links? */ |
1068 |
list1_for_each_entry(ptr, &alias_list, list) { |
1069 |
if (ptr->is_deleted || |
1070 |
ccs_pathcmp(&r, ptr->original_name) || |
1071 |
ccs_pathcmp(&s, ptr->aliased_name)) |
1072 |
continue; |
1073 |
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
1074 |
strncpy(real_program_name, ptr->aliased_name->name, |
1075 |
CCS_MAX_PATHNAME_LEN - 1); |
1076 |
ccs_fill_path_info(&r); |
1077 |
break; |
1078 |
} |
1079 |
} |
1080 |
|
1081 |
/* Compare basename of real_program_name and argv[0] */ |
1082 |
if (bprm->argc > 0 && ccs_check_flags(CCS_TOMOYO_MAC_FOR_ARGV0)) { |
1083 |
char *base_argv0 = tmp->buffer; |
1084 |
const char *base_filename; |
1085 |
retval = -ENOMEM; |
1086 |
if (!get_argv0(bprm, tmp)) |
1087 |
goto out; |
1088 |
base_filename = strrchr(real_program_name, '/'); |
1089 |
if (!base_filename) |
1090 |
base_filename = real_program_name; |
1091 |
else |
1092 |
base_filename++; |
1093 |
if (strcmp(base_argv0, base_filename)) { |
1094 |
retval = ccs_check_argv0_perm(&r, base_argv0); |
1095 |
if (retval) |
1096 |
goto out; |
1097 |
} |
1098 |
} |
1099 |
|
1100 |
/* Check 'aggregator' directive. */ |
1101 |
{ |
1102 |
struct aggregator_entry *ptr; |
1103 |
/* Is this program allowed to be aggregated? */ |
1104 |
list1_for_each_entry(ptr, &aggregator_list, list) { |
1105 |
if (ptr->is_deleted || |
1106 |
!ccs_path_matches_pattern(&r, ptr->original_name)) |
1107 |
continue; |
1108 |
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
1109 |
strncpy(real_program_name, ptr->aggregated_name->name, |
1110 |
CCS_MAX_PATHNAME_LEN - 1); |
1111 |
ccs_fill_path_info(&r); |
1112 |
break; |
1113 |
} |
1114 |
} |
1115 |
|
1116 |
/* Check execute permission. */ |
1117 |
retval = ccs_check_exec_perm(&r, bprm, tmp); |
1118 |
if (retval < 0) |
1119 |
goto out; |
1120 |
|
1121 |
calculate_domain: |
1122 |
new_domain_name = tmp->buffer; |
1123 |
if (is_domain_initializer(old_domain->domainname, &r, &l)) { |
1124 |
/* Transit to the child of KERNEL_DOMAIN domain. */ |
1125 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, |
1126 |
ROOT_NAME " " "%s", real_program_name); |
1127 |
} else if (old_domain == &KERNEL_DOMAIN && !sbin_init_started) { |
1128 |
/* |
1129 |
* Needn't to transit from kernel domain before starting |
1130 |
* /sbin/init. But transit from kernel domain if executing |
1131 |
* initializers because they might start before /sbin/init. |
1132 |
*/ |
1133 |
domain = old_domain; |
1134 |
} else if (is_domain_keeper(old_domain->domainname, &r, &l)) { |
1135 |
/* Keep current domain. */ |
1136 |
domain = old_domain; |
1137 |
} else { |
1138 |
/* Normal domain transition. */ |
1139 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, |
1140 |
"%s %s", old_domain_name, real_program_name); |
1141 |
} |
1142 |
if (domain || strlen(new_domain_name) >= CCS_MAX_PATHNAME_LEN) |
1143 |
goto done; |
1144 |
domain = ccs_find_domain(new_domain_name); |
1145 |
if (domain) |
1146 |
goto done; |
1147 |
if (is_enforce && ccs_check_supervisor(NULL, |
1148 |
"# wants to create domain\n%s\n", |
1149 |
new_domain_name)) |
1150 |
goto done; |
1151 |
domain = ccs_find_or_assign_new_domain(new_domain_name, |
1152 |
old_domain->profile); |
1153 |
if (domain) |
1154 |
audit_domain_creation_log(new_domain_name, mode, |
1155 |
domain->profile); |
1156 |
done: |
1157 |
if (!domain) { |
1158 |
printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", |
1159 |
new_domain_name); |
1160 |
if (is_enforce) |
1161 |
retval = -EPERM; |
1162 |
else |
1163 |
ccs_set_domain_flag(old_domain, false, |
1164 |
DOMAIN_FLAGS_TRANSITION_FAILED); |
1165 |
} else { |
1166 |
retval = 0; |
1167 |
} |
1168 |
out: |
1169 |
ccs_free(real_program_name); |
1170 |
ccs_free(symlink_program_name); |
1171 |
*next_domain = domain ? domain : old_domain; |
1172 |
return retval; |
1173 |
} |
1174 |
|
1175 |
/** |
1176 |
* check_environ - Check permission for environment variable names. |
1177 |
* |
1178 |
* @bprm: Pointer to "struct linux_binprm". |
1179 |
* @tmp: Buffer for temporal use. |
1180 |
* |
1181 |
* Returns 0 on success, negative value otherwise. |
1182 |
*/ |
1183 |
static int check_environ(struct linux_binprm *bprm, struct ccs_page_buffer *tmp) |
1184 |
{ |
1185 |
const u8 profile = current->domain_info->profile; |
1186 |
const u8 mode = ccs_check_flags(CCS_TOMOYO_MAC_FOR_ENV); |
1187 |
char *arg_ptr = tmp->buffer; |
1188 |
int arg_len = 0; |
1189 |
unsigned long pos = bprm->p; |
1190 |
int i = pos / PAGE_SIZE; |
1191 |
int offset = pos % PAGE_SIZE; |
1192 |
int argv_count = bprm->argc; |
1193 |
int envp_count = bprm->envc; |
1194 |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
1195 |
int error = -ENOMEM; |
1196 |
if (!mode || !envp_count) |
1197 |
return 0; |
1198 |
while (error == -ENOMEM) { |
1199 |
struct page *page; |
1200 |
const char *kaddr; |
1201 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1202 |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, |
1203 |
NULL) <= 0) |
1204 |
goto out; |
1205 |
pos += PAGE_SIZE - offset; |
1206 |
#else |
1207 |
page = bprm->page[i]; |
1208 |
#endif |
1209 |
/* Map. */ |
1210 |
kaddr = kmap(page); |
1211 |
if (!kaddr) { /* Mapping failed. */ |
1212 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1213 |
put_page(page); |
1214 |
#endif |
1215 |
goto out; |
1216 |
} |
1217 |
/* Read. */ |
1218 |
while (argv_count && offset < PAGE_SIZE) { |
1219 |
if (!kaddr[offset++]) |
1220 |
argv_count--; |
1221 |
} |
1222 |
if (argv_count) |
1223 |
goto unmap_page; |
1224 |
while (offset < PAGE_SIZE) { |
1225 |
const unsigned char c = kaddr[offset++]; |
1226 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
1227 |
if (c == '=') { |
1228 |
arg_ptr[arg_len++] = '\0'; |
1229 |
} else if (c == '\\') { |
1230 |
arg_ptr[arg_len++] = '\\'; |
1231 |
arg_ptr[arg_len++] = '\\'; |
1232 |
} else if (c > ' ' && c < 127) { |
1233 |
arg_ptr[arg_len++] = c; |
1234 |
} else { |
1235 |
arg_ptr[arg_len++] = '\\'; |
1236 |
arg_ptr[arg_len++] = (c >> 6) + '0'; |
1237 |
arg_ptr[arg_len++] |
1238 |
= ((c >> 3) & 7) + '0'; |
1239 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
1240 |
} |
1241 |
} else { |
1242 |
arg_ptr[arg_len] = '\0'; |
1243 |
} |
1244 |
if (c) |
1245 |
continue; |
1246 |
if (ccs_check_env_perm(arg_ptr, profile, mode)) { |
1247 |
error = -EPERM; |
1248 |
break; |
1249 |
} |
1250 |
if (!--envp_count) { |
1251 |
error = 0; |
1252 |
break; |
1253 |
} |
1254 |
arg_len = 0; |
1255 |
} |
1256 |
unmap_page: |
1257 |
/* Unmap. */ |
1258 |
kunmap(page); |
1259 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1260 |
put_page(page); |
1261 |
#endif |
1262 |
i++; |
1263 |
offset = 0; |
1264 |
} |
1265 |
out: |
1266 |
if (error && mode != 3) |
1267 |
error = 0; |
1268 |
return error; |
1269 |
} |
1270 |
|
1271 |
/** |
1272 |
* unescape - Unescape escaped string. |
1273 |
* |
1274 |
* @dest: String to unescape. |
1275 |
* |
1276 |
* Returns nothing. |
1277 |
*/ |
1278 |
static void unescape(unsigned char *dest) |
1279 |
{ |
1280 |
unsigned char *src = dest; |
1281 |
unsigned char c; |
1282 |
unsigned char d; |
1283 |
unsigned char e; |
1284 |
while ((c = *src++) != '\0') { |
1285 |
if (c != '\\') { |
1286 |
*dest++ = c; |
1287 |
continue; |
1288 |
} |
1289 |
c = *src++; |
1290 |
if (c == '\\') { |
1291 |
*dest++ = c; |
1292 |
continue; |
1293 |
} |
1294 |
if (c < '0' || c > '3') |
1295 |
break; |
1296 |
d = *src++; |
1297 |
if (d < '0' || d > '7') |
1298 |
break; |
1299 |
e = *src++; |
1300 |
if (e < '0' || e > '7') |
1301 |
break; |
1302 |
*dest++ = ((c - '0') << 6) + ((d - '0') << 3) + (e - '0'); |
1303 |
} |
1304 |
*dest = '\0'; |
1305 |
} |
1306 |
|
1307 |
/** |
1308 |
* root_depth - Get number of directories to strip. |
1309 |
* |
1310 |
* @dentry: Pointer to "struct dentry". |
1311 |
* @vfsmnt: Pointer to "struct vfsmount". |
1312 |
* |
1313 |
* Returns number of directories to strip. |
1314 |
*/ |
1315 |
static inline int root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
1316 |
{ |
1317 |
int depth = 0; |
1318 |
/***** CRITICAL SECTION START *****/ |
1319 |
spin_lock(&dcache_lock); |
1320 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1321 |
spin_lock(&vfsmount_lock); |
1322 |
#endif |
1323 |
for (;;) { |
1324 |
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
1325 |
/* Global root? */ |
1326 |
if (vfsmnt->mnt_parent == vfsmnt) |
1327 |
break; |
1328 |
dentry = vfsmnt->mnt_mountpoint; |
1329 |
vfsmnt = vfsmnt->mnt_parent; |
1330 |
continue; |
1331 |
} |
1332 |
dentry = dentry->d_parent; |
1333 |
depth++; |
1334 |
} |
1335 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1336 |
spin_unlock(&vfsmount_lock); |
1337 |
#endif |
1338 |
spin_unlock(&dcache_lock); |
1339 |
/***** CRITICAL SECTION END *****/ |
1340 |
return depth; |
1341 |
} |
1342 |
|
1343 |
/** |
1344 |
* get_root_depth - return the depth of root directory. |
1345 |
* |
1346 |
* Returns number of directories to strip. |
1347 |
*/ |
1348 |
static int get_root_depth(void) |
1349 |
{ |
1350 |
int depth; |
1351 |
struct dentry *dentry; |
1352 |
struct vfsmount *vfsmnt; |
1353 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1354 |
struct path root; |
1355 |
#endif |
1356 |
/***** CRITICAL SECTION START *****/ |
1357 |
read_lock(¤t->fs->lock); |
1358 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1359 |
root = current->fs->root; |
1360 |
path_get(¤t->fs->root); |
1361 |
dentry = root.dentry; |
1362 |
vfsmnt = root.mnt; |
1363 |
#else |
1364 |
dentry = dget(current->fs->root); |
1365 |
vfsmnt = mntget(current->fs->rootmnt); |
1366 |
#endif |
1367 |
read_unlock(¤t->fs->lock); |
1368 |
/***** CRITICAL SECTION END *****/ |
1369 |
depth = root_depth(dentry, vfsmnt); |
1370 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1371 |
path_put(&root); |
1372 |
#else |
1373 |
dput(dentry); |
1374 |
mntput(vfsmnt); |
1375 |
#endif |
1376 |
return depth; |
1377 |
} |
1378 |
|
1379 |
/** |
1380 |
* try_alt_exec - Try to start execute handler. |
1381 |
* |
1382 |
* @bprm: Pointer to "struct linux_binprm". |
1383 |
* @filename: The name of requested program. |
1384 |
* @work: Pointer to pointer to the name of execute handler. |
1385 |
* @next_domain: Pointer to pointer to "struct domain_info". |
1386 |
* @tmp: Buffer for temporal use. |
1387 |
* |
1388 |
* Returns 0 on success, negative value otherwise. |
1389 |
*/ |
1390 |
static int try_alt_exec(struct linux_binprm *bprm, |
1391 |
const struct path_info *filename, char **work, |
1392 |
struct domain_info **next_domain, |
1393 |
struct ccs_page_buffer *tmp) |
1394 |
{ |
1395 |
/* |
1396 |
* Contents of modified bprm. |
1397 |
* The envp[] in original bprm is moved to argv[] so that |
1398 |
* the alternatively executed program won't be affected by |
1399 |
* some dangerous environment variables like LD_PRELOAD. |
1400 |
* |
1401 |
* modified bprm->argc |
1402 |
* = original bprm->argc + original bprm->envc + 7 |
1403 |
* modified bprm->envc |
1404 |
* = 0 |
1405 |
* |
1406 |
* modified bprm->argv[0] |
1407 |
* = the program's name specified by execute_handler |
1408 |
* modified bprm->argv[1] |
1409 |
* = current->domain_info->domainname->name |
1410 |
* modified bprm->argv[2] |
1411 |
* = the current process's name |
1412 |
* modified bprm->argv[3] |
1413 |
* = the current process's information (e.g. uid/gid). |
1414 |
* modified bprm->argv[4] |
1415 |
* = original bprm->filename |
1416 |
* modified bprm->argv[5] |
1417 |
* = original bprm->argc in string expression |
1418 |
* modified bprm->argv[6] |
1419 |
* = original bprm->envc in string expression |
1420 |
* modified bprm->argv[7] |
1421 |
* = original bprm->argv[0] |
1422 |
* ... |
1423 |
* modified bprm->argv[bprm->argc + 6] |
1424 |
* = original bprm->argv[bprm->argc - 1] |
1425 |
* modified bprm->argv[bprm->argc + 7] |
1426 |
* = original bprm->envp[0] |
1427 |
* ... |
1428 |
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
1429 |
* = original bprm->envp[bprm->envc - 1] |
1430 |
*/ |
1431 |
struct file *filp; |
1432 |
int retval; |
1433 |
const int original_argc = bprm->argc; |
1434 |
const int original_envc = bprm->envc; |
1435 |
struct task_struct *task = current; |
1436 |
char *buffer = tmp->buffer; |
1437 |
/* Allocate memory for execute handler's pathname. */ |
1438 |
char *execute_handler = ccs_alloc(sizeof(struct ccs_page_buffer)); |
1439 |
*work = execute_handler; |
1440 |
if (!execute_handler) |
1441 |
return -ENOMEM; |
1442 |
strncpy(execute_handler, filename->name, |
1443 |
sizeof(struct ccs_page_buffer) - 1); |
1444 |
unescape(execute_handler); |
1445 |
|
1446 |
/* Close the requested program's dentry. */ |
1447 |
allow_write_access(bprm->file); |
1448 |
fput(bprm->file); |
1449 |
bprm->file = NULL; |
1450 |
|
1451 |
{ /* Adjust root directory for open_exec(). */ |
1452 |
int depth = get_root_depth(); |
1453 |
char *cp = execute_handler; |
1454 |
if (!*cp || *cp != '/') |
1455 |
return -ENOENT; |
1456 |
while (depth) { |
1457 |
cp = strchr(cp + 1, '/'); |
1458 |
if (!cp) |
1459 |
return -ENOENT; |
1460 |
depth--; |
1461 |
} |
1462 |
memmove(execute_handler, cp, strlen(cp) + 1); |
1463 |
} |
1464 |
|
1465 |
/* Move envp[] to argv[] */ |
1466 |
bprm->argc += bprm->envc; |
1467 |
bprm->envc = 0; |
1468 |
|
1469 |
/* Set argv[6] */ |
1470 |
{ |
1471 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, "%d", |
1472 |
original_envc); |
1473 |
retval = copy_strings_kernel(1, &buffer, bprm); |
1474 |
if (retval < 0) |
1475 |
goto out; |
1476 |
bprm->argc++; |
1477 |
} |
1478 |
|
1479 |
/* Set argv[5] */ |
1480 |
{ |
1481 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, "%d", |
1482 |
original_argc); |
1483 |
retval = copy_strings_kernel(1, &buffer, bprm); |
1484 |
if (retval < 0) |
1485 |
goto out; |
1486 |
bprm->argc++; |
1487 |
} |
1488 |
|
1489 |
/* Set argv[4] */ |
1490 |
{ |
1491 |
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
1492 |
if (retval < 0) |
1493 |
goto out; |
1494 |
bprm->argc++; |
1495 |
} |
1496 |
|
1497 |
/* Set argv[3] */ |
1498 |
{ |
1499 |
const u32 tomoyo_flags = task->tomoyo_flags; |
1500 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, |
1501 |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
1502 |
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
1503 |
"state[1]=%u state[2]=%u", |
1504 |
task->pid, task->uid, task->gid, task->euid, |
1505 |
task->egid, task->suid, task->sgid, task->fsuid, |
1506 |
task->fsgid, (u8) (tomoyo_flags >> 24), |
1507 |
(u8) (tomoyo_flags >> 16), (u8) (tomoyo_flags >> 8)); |
1508 |
retval = copy_strings_kernel(1, &buffer, bprm); |
1509 |
if (retval < 0) |
1510 |
goto out; |
1511 |
bprm->argc++; |
1512 |
} |
1513 |
|
1514 |
/* Set argv[2] */ |
1515 |
{ |
1516 |
char *exe = (char *) ccs_get_exe(); |
1517 |
if (exe) { |
1518 |
retval = copy_strings_kernel(1, &exe, bprm); |
1519 |
ccs_free(exe); |
1520 |
} else { |
1521 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, |
1522 |
"<unknown>"); |
1523 |
retval = copy_strings_kernel(1, &buffer, bprm); |
1524 |
} |
1525 |
if (retval < 0) |
1526 |
goto out; |
1527 |
bprm->argc++; |
1528 |
} |
1529 |
|
1530 |
/* Set argv[1] */ |
1531 |
{ |
1532 |
strncpy(buffer, task->domain_info->domainname->name, |
1533 |
sizeof(struct ccs_page_buffer) - 1); |
1534 |
retval = copy_strings_kernel(1, &buffer, bprm); |
1535 |
if (retval < 0) |
1536 |
goto out; |
1537 |
bprm->argc++; |
1538 |
} |
1539 |
|
1540 |
/* Set argv[0] */ |
1541 |
{ |
1542 |
retval = copy_strings_kernel(1, &execute_handler, bprm); |
1543 |
if (retval < 0) |
1544 |
goto out; |
1545 |
bprm->argc++; |
1546 |
} |
1547 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
1548 |
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
1549 |
bprm->argv_len = bprm->exec - bprm->p; |
1550 |
#endif |
1551 |
#endif |
1552 |
|
1553 |
/* OK, now restart the process with execute handler program's dentry. */ |
1554 |
filp = open_exec(execute_handler); |
1555 |
if (IS_ERR(filp)) { |
1556 |
retval = PTR_ERR(filp); |
1557 |
goto out; |
1558 |
} |
1559 |
bprm->file = filp; |
1560 |
bprm->filename = execute_handler; |
1561 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1562 |
bprm->interp = execute_handler; |
1563 |
#endif |
1564 |
retval = prepare_binprm(bprm); |
1565 |
if (retval < 0) |
1566 |
goto out; |
1567 |
task->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1568 |
retval = find_next_domain(bprm, next_domain, filename, tmp); |
1569 |
task->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1570 |
out: |
1571 |
return retval; |
1572 |
} |
1573 |
|
1574 |
/** |
1575 |
* find_execute_handler - Find an execute handler. |
1576 |
* |
1577 |
* @type: Type of execute handler. |
1578 |
* |
1579 |
* Returns pointer to "struct path_info" if found, NULL otherwise. |
1580 |
*/ |
1581 |
static const struct path_info *find_execute_handler(const u8 type) |
1582 |
{ |
1583 |
struct task_struct *task = current; |
1584 |
const struct domain_info *domain = task->domain_info; |
1585 |
struct acl_info *ptr; |
1586 |
/* |
1587 |
* Don't use execute handler if the current process is |
1588 |
* marked as execute handler to avoid infinite execute handler loop. |
1589 |
*/ |
1590 |
if (task->tomoyo_flags & TOMOYO_TASK_IS_EXECUTE_HANDLER) |
1591 |
return NULL; |
1592 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
1593 |
struct execute_handler_record *acl; |
1594 |
if (ptr->type != type) |
1595 |
continue; |
1596 |
acl = container_of(ptr, struct execute_handler_record, head); |
1597 |
return acl->handler; |
1598 |
} |
1599 |
return NULL; |
1600 |
} |
1601 |
|
1602 |
/** |
1603 |
* search_binary_handler_with_transition - Perform domain transition. |
1604 |
* |
1605 |
* @bprm: Pointer to "struct linux_binprm". |
1606 |
* @regs: Pointer to "struct pt_regs". |
1607 |
* |
1608 |
* Returns result of search_binary_handler() on success, |
1609 |
* negative value otherwise. |
1610 |
*/ |
1611 |
int search_binary_handler_with_transition(struct linux_binprm *bprm, |
1612 |
struct pt_regs *regs) |
1613 |
{ |
1614 |
struct task_struct *task = current; |
1615 |
struct domain_info *next_domain = NULL; |
1616 |
struct domain_info *prev_domain = task->domain_info; |
1617 |
const struct path_info *handler; |
1618 |
int retval; |
1619 |
/* |
1620 |
* "work" holds path to program. |
1621 |
* Thus, keep valid until search_binary_handler() finishes. |
1622 |
*/ |
1623 |
char *work = NULL; |
1624 |
struct ccs_page_buffer *buf = ccs_alloc(sizeof(struct ccs_page_buffer)); |
1625 |
ccs_load_policy(bprm->filename); |
1626 |
if (!buf) |
1627 |
return -ENOMEM; |
1628 |
/* printk(KERN_DEBUG "rootdepth=%d\n", get_root_depth()); */ |
1629 |
handler = find_execute_handler(TYPE_EXECUTE_HANDLER); |
1630 |
if (handler) { |
1631 |
retval = try_alt_exec(bprm, handler, &work, &next_domain, buf); |
1632 |
if (!retval) |
1633 |
audit_execute_handler_log(true, work, bprm); |
1634 |
goto ok; |
1635 |
} |
1636 |
retval = find_next_domain(bprm, &next_domain, NULL, buf); |
1637 |
if (retval != -EPERM) |
1638 |
goto ok; |
1639 |
handler = find_execute_handler(TYPE_DENIED_EXECUTE_HANDLER); |
1640 |
if (handler) { |
1641 |
retval = try_alt_exec(bprm, handler, &work, &next_domain, buf); |
1642 |
if (!retval) |
1643 |
audit_execute_handler_log(false, work, bprm); |
1644 |
} |
1645 |
ok: |
1646 |
if (retval) |
1647 |
goto out; |
1648 |
task->domain_info = next_domain; |
1649 |
retval = check_environ(bprm, buf); |
1650 |
if (retval) |
1651 |
goto out; |
1652 |
task->tomoyo_flags |= TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
1653 |
retval = search_binary_handler(bprm, regs); |
1654 |
task->tomoyo_flags &= ~TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
1655 |
out: |
1656 |
/* Return to previous domain if execution failed. */ |
1657 |
if (retval < 0) |
1658 |
task->domain_info = prev_domain; |
1659 |
/* Mark the current process as execute handler. */ |
1660 |
else if (handler) |
1661 |
task->tomoyo_flags |= TOMOYO_TASK_IS_EXECUTE_HANDLER; |
1662 |
/* Mark the current process as normal process. */ |
1663 |
else |
1664 |
task->tomoyo_flags &= ~TOMOYO_TASK_IS_EXECUTE_HANDLER; |
1665 |
ccs_free(work); |
1666 |
ccs_free(buf); |
1667 |
return retval; |
1668 |
} |
1669 |
|
1670 |
#else |
1671 |
|
1672 |
/** |
1673 |
* search_binary_handler_with_transition - Wrapper for search_binary_handler(). |
1674 |
* |
1675 |
* @bprm: Pointer to "struct linux_binprm". |
1676 |
* @regs: Pointer to "struct pt_regs". |
1677 |
* |
1678 |
* Returns the result of search_binary_handler(). |
1679 |
*/ |
1680 |
int search_binary_handler_with_transition(struct linux_binprm *bprm, |
1681 |
struct pt_regs *regs) |
1682 |
{ |
1683 |
#ifdef CONFIG_SAKURA |
1684 |
ccs_load_policy(bprm->filename); |
1685 |
#endif |
1686 |
return search_binary_handler(bprm, regs); |
1687 |
} |
1688 |
|
1689 |
#endif |