1 |
/* |
2 |
* fs/tomoyo_domain.c |
3 |
* |
4 |
* Implementation of the Domain-Based Mandatory Access Control. |
5 |
* |
6 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
7 |
* |
8 |
* Version: 1.6.6-pre 2009/01/05 |
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 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
20 |
#include <linux/namei.h> |
21 |
#include <linux/mount.h> |
22 |
#endif |
23 |
|
24 |
/* For compatibility with older kernels. */ |
25 |
#ifndef for_each_process |
26 |
#define for_each_process for_each_task |
27 |
#endif |
28 |
|
29 |
/* Variables definitions.*/ |
30 |
|
31 |
/* The initial domain. */ |
32 |
struct domain_info KERNEL_DOMAIN; |
33 |
|
34 |
/* The list for "struct domain_info". */ |
35 |
LIST1_HEAD(ccs_domain_list); |
36 |
|
37 |
#ifdef CONFIG_TOMOYO |
38 |
|
39 |
/* Domain creation lock. */ |
40 |
static DEFINE_MUTEX(ccs_domain_list_lock); |
41 |
|
42 |
/* Structure for "initialize_domain" and "no_initialize_domain" keyword. */ |
43 |
struct ccs_domain_initializer_entry { |
44 |
struct list1_head list; |
45 |
const struct ccs_path_info *domainname; /* This may be NULL */ |
46 |
const struct ccs_path_info *program; |
47 |
bool is_deleted; |
48 |
bool is_not; /* True if this entry is "no_initialize_domain". */ |
49 |
bool is_last_name; /* True if the domainname is ccs_get_last_name(). */ |
50 |
}; |
51 |
|
52 |
/* Structure for "keep_domain" and "no_keep_domain" keyword. */ |
53 |
struct ccs_domain_keeper_entry { |
54 |
struct list1_head list; |
55 |
const struct ccs_path_info *domainname; |
56 |
const struct ccs_path_info *program; /* This may be NULL */ |
57 |
bool is_deleted; |
58 |
bool is_not; /* True if this entry is "no_keep_domain". */ |
59 |
bool is_last_name; /* True if the domainname is ccs_get_last_name(). */ |
60 |
}; |
61 |
|
62 |
/* Structure for "aggregator" keyword. */ |
63 |
struct ccs_aggregator_entry { |
64 |
struct list1_head list; |
65 |
const struct ccs_path_info *original_name; |
66 |
const struct ccs_path_info *aggregated_name; |
67 |
bool is_deleted; |
68 |
}; |
69 |
|
70 |
/* Structure for "alias" keyword. */ |
71 |
struct ccs_alias_entry { |
72 |
struct list1_head list; |
73 |
const struct ccs_path_info *original_name; |
74 |
const struct ccs_path_info *aliased_name; |
75 |
bool is_deleted; |
76 |
}; |
77 |
|
78 |
/** |
79 |
* ccs_set_domain_flag - Set or clear domain's attribute flags. |
80 |
* |
81 |
* @domain: Pointer to "struct domain_info". |
82 |
* @is_delete: True if it is a delete request. |
83 |
* @flags: Flags to set or clear. |
84 |
* |
85 |
* Returns nothing. |
86 |
*/ |
87 |
void ccs_set_domain_flag(struct domain_info *domain, const bool is_delete, |
88 |
const u8 flags) |
89 |
{ |
90 |
/* We need to serialize because this is bitfield operation. */ |
91 |
static DEFINE_SPINLOCK(lock); |
92 |
/***** CRITICAL SECTION START *****/ |
93 |
spin_lock(&lock); |
94 |
if (!is_delete) |
95 |
domain->flags |= flags; |
96 |
else |
97 |
domain->flags &= ~flags; |
98 |
spin_unlock(&lock); |
99 |
/***** CRITICAL SECTION END *****/ |
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; |
112 |
const char *cp1 = strrchr(cp0, ' '); |
113 |
if (cp1) |
114 |
return cp1 + 1; |
115 |
return cp0; |
116 |
} |
117 |
|
118 |
/** |
119 |
* ccs_add_domain_acl - Add the given ACL to the given domain. |
120 |
* |
121 |
* @domain: Pointer to "struct domain_info". May be NULL. |
122 |
* @acl: Pointer to "struct ccs_acl_info". |
123 |
* |
124 |
* Returns 0. |
125 |
*/ |
126 |
int ccs_add_domain_acl(struct domain_info *domain, struct ccs_acl_info *acl) |
127 |
{ |
128 |
if (domain) { |
129 |
/* |
130 |
* We need to serialize because this function is called by |
131 |
* various update functions. |
132 |
*/ |
133 |
static DEFINE_SPINLOCK(lock); |
134 |
/***** CRITICAL SECTION START *****/ |
135 |
spin_lock(&lock); |
136 |
list1_add_tail_mb(&acl->list, &domain->acl_info_list); |
137 |
spin_unlock(&lock); |
138 |
/***** CRITICAL SECTION END *****/ |
139 |
} else { |
140 |
acl->type &= ~ACL_DELETED; |
141 |
} |
142 |
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
143 |
return 0; |
144 |
} |
145 |
|
146 |
/** |
147 |
* ccs_del_domain_acl - Delete the given ACL from the domain. |
148 |
* |
149 |
* @acl: Pointer to "struct ccs_acl_info". May be NULL. |
150 |
* |
151 |
* Returns 0. |
152 |
*/ |
153 |
int ccs_del_domain_acl(struct ccs_acl_info *acl) |
154 |
{ |
155 |
if (acl) |
156 |
acl->type |= ACL_DELETED; |
157 |
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
158 |
return 0; |
159 |
} |
160 |
|
161 |
/** |
162 |
* ccs_audit_execute_handler_log - Audit execute_handler log. |
163 |
* |
164 |
* @ee: Pointer to "struct ccs_execve_entry". |
165 |
* @is_default: True if it is "execute_handler" log. |
166 |
* |
167 |
* Returns 0 on success, negative value otherwise. |
168 |
*/ |
169 |
static int ccs_audit_execute_handler_log(struct ccs_execve_entry *ee, |
170 |
const bool is_default) |
171 |
{ |
172 |
struct ccs_request_info *r = &ee->r; |
173 |
const char *handler = ee->handler->name; |
174 |
r->mode = ccs_check_flags(r->domain, CCS_TOMOYO_MAC_FOR_FILE); |
175 |
return ccs_write_audit_log(true, r, "%s %s\n", |
176 |
is_default ? KEYWORD_EXECUTE_HANDLER : |
177 |
KEYWORD_DENIED_EXECUTE_HANDLER, handler); |
178 |
} |
179 |
|
180 |
/** |
181 |
* ccs_audit_domain_creation_log - Audit domain creation log. |
182 |
* |
183 |
* @domain: Pointer to "struct domain_info". |
184 |
* |
185 |
* Returns 0 on success, negative value otherwise. |
186 |
*/ |
187 |
static int ccs_audit_domain_creation_log(struct domain_info *domain) |
188 |
{ |
189 |
struct ccs_request_info r; |
190 |
ccs_init_request_info(&r, domain, CCS_TOMOYO_MAC_FOR_FILE); |
191 |
return ccs_write_audit_log(false, &r, "use_profile %u\n", r.profile); |
192 |
} |
193 |
|
194 |
/* The list for "struct ccs_domain_initializer_entry". */ |
195 |
static LIST1_HEAD(ccs_domain_initializer_list); |
196 |
|
197 |
/** |
198 |
* ccs_update_domain_initializer_entry - Update "struct ccs_domain_initializer_entry" list. |
199 |
* |
200 |
* @domainname: The name of domain. May be NULL. |
201 |
* @program: The name of program. |
202 |
* @is_not: True if it is "no_initialize_domain" entry. |
203 |
* @is_delete: True if it is a delete request. |
204 |
* |
205 |
* Returns 0 on success, negative value otherwise. |
206 |
*/ |
207 |
static int ccs_update_domain_initializer_entry(const char *domainname, |
208 |
const char *program, |
209 |
const bool is_not, |
210 |
const bool is_delete) |
211 |
{ |
212 |
struct ccs_domain_initializer_entry *new_entry; |
213 |
struct ccs_domain_initializer_entry *ptr; |
214 |
static DEFINE_MUTEX(lock); |
215 |
const struct ccs_path_info *saved_program; |
216 |
const struct ccs_path_info *saved_domainname = NULL; |
217 |
int error = -ENOMEM; |
218 |
bool is_last_name = false; |
219 |
if (!ccs_is_correct_path(program, 1, -1, -1, __func__)) |
220 |
return -EINVAL; /* No patterns allowed. */ |
221 |
if (domainname) { |
222 |
if (!ccs_is_domain_def(domainname) && |
223 |
ccs_is_correct_path(domainname, 1, -1, -1, __func__)) |
224 |
is_last_name = true; |
225 |
else if (!ccs_is_correct_domain(domainname, __func__)) |
226 |
return -EINVAL; |
227 |
saved_domainname = ccs_save_name(domainname); |
228 |
if (!saved_domainname) |
229 |
return -ENOMEM; |
230 |
} |
231 |
saved_program = ccs_save_name(program); |
232 |
if (!saved_program) |
233 |
return -ENOMEM; |
234 |
mutex_lock(&lock); |
235 |
list1_for_each_entry(ptr, &ccs_domain_initializer_list, list) { |
236 |
if (ptr->is_not != is_not || |
237 |
ptr->domainname != saved_domainname || |
238 |
ptr->program != saved_program) |
239 |
continue; |
240 |
ptr->is_deleted = is_delete; |
241 |
error = 0; |
242 |
goto out; |
243 |
} |
244 |
if (is_delete) { |
245 |
error = -ENOENT; |
246 |
goto out; |
247 |
} |
248 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
249 |
if (!new_entry) |
250 |
goto out; |
251 |
new_entry->domainname = saved_domainname; |
252 |
new_entry->program = saved_program; |
253 |
new_entry->is_not = is_not; |
254 |
new_entry->is_last_name = is_last_name; |
255 |
list1_add_tail_mb(&new_entry->list, &ccs_domain_initializer_list); |
256 |
error = 0; |
257 |
out: |
258 |
mutex_unlock(&lock); |
259 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
260 |
return error; |
261 |
} |
262 |
|
263 |
/** |
264 |
* ccs_read_domain_initializer_policy - Read "struct ccs_domain_initializer_entry" list. |
265 |
* |
266 |
* @head: Pointer to "struct ccs_io_buffer". |
267 |
* |
268 |
* Returns true on success, false otherwise. |
269 |
*/ |
270 |
bool ccs_read_domain_initializer_policy(struct ccs_io_buffer *head) |
271 |
{ |
272 |
struct list1_head *pos; |
273 |
list1_for_each_cookie(pos, head->read_var2, |
274 |
&ccs_domain_initializer_list) { |
275 |
const char *no; |
276 |
const char *from = ""; |
277 |
const char *domain = ""; |
278 |
struct ccs_domain_initializer_entry *ptr; |
279 |
ptr = list1_entry(pos, struct ccs_domain_initializer_entry, |
280 |
list); |
281 |
if (ptr->is_deleted) |
282 |
continue; |
283 |
no = ptr->is_not ? "no_" : ""; |
284 |
if (ptr->domainname) { |
285 |
from = " from "; |
286 |
domain = ptr->domainname->name; |
287 |
} |
288 |
if (!ccs_io_printf(head, |
289 |
"%s" KEYWORD_INITIALIZE_DOMAIN "%s%s%s\n", |
290 |
no, ptr->program->name, from, domain)) |
291 |
goto out; |
292 |
} |
293 |
return true; |
294 |
out: |
295 |
return false; |
296 |
} |
297 |
|
298 |
/** |
299 |
* ccs_write_domain_initializer_policy - Write "struct ccs_domain_initializer_entry" list. |
300 |
* |
301 |
* @data: String to parse. |
302 |
* @is_not: True if it is "no_initialize_domain" entry. |
303 |
* @is_delete: True if it is a delete request. |
304 |
* |
305 |
* Returns 0 on success, negative value otherwise. |
306 |
*/ |
307 |
int ccs_write_domain_initializer_policy(char *data, const bool is_not, |
308 |
const bool is_delete) |
309 |
{ |
310 |
char *cp = strstr(data, " from "); |
311 |
if (cp) { |
312 |
*cp = '\0'; |
313 |
return ccs_update_domain_initializer_entry(cp + 6, data, |
314 |
is_not, is_delete); |
315 |
} |
316 |
return ccs_update_domain_initializer_entry(NULL, data, is_not, |
317 |
is_delete); |
318 |
} |
319 |
|
320 |
/** |
321 |
* ccs_is_domain_initializer - Check whether the given program causes domainname reinitialization. |
322 |
* |
323 |
* @domainname: The name of domain. |
324 |
* @program: The name of program. |
325 |
* @last_name: The last component of @domainname. |
326 |
* |
327 |
* Returns true if executing @program reinitializes domain transition, |
328 |
* false otherwise. |
329 |
*/ |
330 |
static bool ccs_is_domain_initializer(const struct ccs_path_info *domainname, |
331 |
const struct ccs_path_info *program, |
332 |
const struct ccs_path_info *last_name) |
333 |
{ |
334 |
struct ccs_domain_initializer_entry *ptr; |
335 |
bool flag = false; |
336 |
list1_for_each_entry(ptr, &ccs_domain_initializer_list, list) { |
337 |
if (ptr->is_deleted) |
338 |
continue; |
339 |
if (ptr->domainname) { |
340 |
if (!ptr->is_last_name) { |
341 |
if (ptr->domainname != domainname) |
342 |
continue; |
343 |
} else { |
344 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
345 |
continue; |
346 |
} |
347 |
} |
348 |
if (ccs_pathcmp(ptr->program, program)) |
349 |
continue; |
350 |
if (ptr->is_not) |
351 |
return false; |
352 |
flag = true; |
353 |
} |
354 |
return flag; |
355 |
} |
356 |
|
357 |
/* The list for "struct ccs_domain_keeper_entry". */ |
358 |
static LIST1_HEAD(ccs_domain_keeper_list); |
359 |
|
360 |
/** |
361 |
* ccs_update_domain_keeper_entry - Update "struct ccs_domain_keeper_entry" list. |
362 |
* |
363 |
* @domainname: The name of domain. |
364 |
* @program: The name of program. May be NULL. |
365 |
* @is_not: True if it is "no_keep_domain" entry. |
366 |
* @is_delete: True if it is a delete request. |
367 |
* |
368 |
* Returns 0 on success, negative value otherwise. |
369 |
*/ |
370 |
static int ccs_update_domain_keeper_entry(const char *domainname, |
371 |
const char *program, |
372 |
const bool is_not, |
373 |
const bool is_delete) |
374 |
{ |
375 |
struct ccs_domain_keeper_entry *new_entry; |
376 |
struct ccs_domain_keeper_entry *ptr; |
377 |
const struct ccs_path_info *saved_domainname; |
378 |
const struct ccs_path_info *saved_program = NULL; |
379 |
static DEFINE_MUTEX(lock); |
380 |
int error = -ENOMEM; |
381 |
bool is_last_name = false; |
382 |
if (!ccs_is_domain_def(domainname) && |
383 |
ccs_is_correct_path(domainname, 1, -1, -1, __func__)) |
384 |
is_last_name = true; |
385 |
else if (!ccs_is_correct_domain(domainname, __func__)) |
386 |
return -EINVAL; |
387 |
if (program) { |
388 |
if (!ccs_is_correct_path(program, 1, -1, -1, __func__)) |
389 |
return -EINVAL; |
390 |
saved_program = ccs_save_name(program); |
391 |
if (!saved_program) |
392 |
return -ENOMEM; |
393 |
} |
394 |
saved_domainname = ccs_save_name(domainname); |
395 |
if (!saved_domainname) |
396 |
return -ENOMEM; |
397 |
mutex_lock(&lock); |
398 |
list1_for_each_entry(ptr, &ccs_domain_keeper_list, list) { |
399 |
if (ptr->is_not != is_not || |
400 |
ptr->domainname != saved_domainname || |
401 |
ptr->program != saved_program) |
402 |
continue; |
403 |
ptr->is_deleted = is_delete; |
404 |
error = 0; |
405 |
goto out; |
406 |
} |
407 |
if (is_delete) { |
408 |
error = -ENOENT; |
409 |
goto out; |
410 |
} |
411 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
412 |
if (!new_entry) |
413 |
goto out; |
414 |
new_entry->domainname = saved_domainname; |
415 |
new_entry->program = saved_program; |
416 |
new_entry->is_not = is_not; |
417 |
new_entry->is_last_name = is_last_name; |
418 |
list1_add_tail_mb(&new_entry->list, &ccs_domain_keeper_list); |
419 |
error = 0; |
420 |
out: |
421 |
mutex_unlock(&lock); |
422 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
423 |
return error; |
424 |
} |
425 |
|
426 |
/** |
427 |
* ccs_write_domain_keeper_policy - Write "struct ccs_domain_keeper_entry" list. |
428 |
* |
429 |
* @data: String to parse. |
430 |
* @is_not: True if it is "no_keep_domain" entry. |
431 |
* @is_delete: True if it is a delete request. |
432 |
* |
433 |
*/ |
434 |
int ccs_write_domain_keeper_policy(char *data, const bool is_not, |
435 |
const bool is_delete) |
436 |
{ |
437 |
char *cp = strstr(data, " from "); |
438 |
if (cp) { |
439 |
*cp = '\0'; |
440 |
return ccs_update_domain_keeper_entry(cp + 6, data, |
441 |
is_not, is_delete); |
442 |
} |
443 |
return ccs_update_domain_keeper_entry(data, NULL, is_not, is_delete); |
444 |
} |
445 |
|
446 |
/** |
447 |
* ccs_read_domain_keeper_policy - Read "struct ccs_domain_keeper_entry" list. |
448 |
* |
449 |
* @head: Pointer to "struct ccs_io_buffer". |
450 |
* |
451 |
* Returns true on success, false otherwise. |
452 |
*/ |
453 |
bool ccs_read_domain_keeper_policy(struct ccs_io_buffer *head) |
454 |
{ |
455 |
struct list1_head *pos; |
456 |
list1_for_each_cookie(pos, head->read_var2, &ccs_domain_keeper_list) { |
457 |
struct ccs_domain_keeper_entry *ptr; |
458 |
const char *no; |
459 |
const char *from = ""; |
460 |
const char *program = ""; |
461 |
ptr = list1_entry(pos, struct ccs_domain_keeper_entry, list); |
462 |
if (ptr->is_deleted) |
463 |
continue; |
464 |
no = ptr->is_not ? "no_" : ""; |
465 |
if (ptr->program) { |
466 |
from = " from "; |
467 |
program = ptr->program->name; |
468 |
} |
469 |
if (!ccs_io_printf(head, |
470 |
"%s" KEYWORD_KEEP_DOMAIN "%s%s%s\n", no, |
471 |
program, from, ptr->domainname->name)) |
472 |
goto out; |
473 |
} |
474 |
return true; |
475 |
out: |
476 |
return false; |
477 |
} |
478 |
|
479 |
/** |
480 |
* ccs_is_domain_keeper - Check whether the given program causes domain transition suppression. |
481 |
* |
482 |
* @domainname: The name of domain. |
483 |
* @program: The name of program. |
484 |
* @last_name: The last component of @domainname. |
485 |
* |
486 |
* Returns true if executing @program supresses domain transition, |
487 |
* false otherwise. |
488 |
*/ |
489 |
static bool ccs_is_domain_keeper(const struct ccs_path_info *domainname, |
490 |
const struct ccs_path_info *program, |
491 |
const struct ccs_path_info *last_name) |
492 |
{ |
493 |
struct ccs_domain_keeper_entry *ptr; |
494 |
bool flag = false; |
495 |
list1_for_each_entry(ptr, &ccs_domain_keeper_list, list) { |
496 |
if (ptr->is_deleted) |
497 |
continue; |
498 |
if (!ptr->is_last_name) { |
499 |
if (ptr->domainname != domainname) |
500 |
continue; |
501 |
} else { |
502 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
503 |
continue; |
504 |
} |
505 |
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
506 |
continue; |
507 |
if (ptr->is_not) |
508 |
return false; |
509 |
flag = true; |
510 |
} |
511 |
return flag; |
512 |
} |
513 |
|
514 |
/* The list for "struct ccs_alias_entry". */ |
515 |
static LIST1_HEAD(ccs_alias_list); |
516 |
|
517 |
/** |
518 |
* ccs_update_alias_entry - Update "struct ccs_alias_entry" list. |
519 |
* |
520 |
* @original_name: The original program's real name. |
521 |
* @aliased_name: The symbolic program's symbolic link's name. |
522 |
* @is_delete: True if it is a delete request. |
523 |
* |
524 |
* Returns 0 on success, negative value otherwise. |
525 |
*/ |
526 |
static int ccs_update_alias_entry(const char *original_name, |
527 |
const char *aliased_name, |
528 |
const bool is_delete) |
529 |
{ |
530 |
struct ccs_alias_entry *new_entry; |
531 |
struct ccs_alias_entry *ptr; |
532 |
static DEFINE_MUTEX(lock); |
533 |
const struct ccs_path_info *saved_original_name; |
534 |
const struct ccs_path_info *saved_aliased_name; |
535 |
int error = -ENOMEM; |
536 |
if (!ccs_is_correct_path(original_name, 1, -1, -1, __func__) || |
537 |
!ccs_is_correct_path(aliased_name, 1, -1, -1, __func__)) |
538 |
return -EINVAL; /* No patterns allowed. */ |
539 |
saved_original_name = ccs_save_name(original_name); |
540 |
saved_aliased_name = ccs_save_name(aliased_name); |
541 |
if (!saved_original_name || !saved_aliased_name) |
542 |
return -ENOMEM; |
543 |
mutex_lock(&lock); |
544 |
list1_for_each_entry(ptr, &ccs_alias_list, list) { |
545 |
if (ptr->original_name != saved_original_name || |
546 |
ptr->aliased_name != saved_aliased_name) |
547 |
continue; |
548 |
ptr->is_deleted = is_delete; |
549 |
error = 0; |
550 |
goto out; |
551 |
} |
552 |
if (is_delete) { |
553 |
error = -ENOENT; |
554 |
goto out; |
555 |
} |
556 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
557 |
if (!new_entry) |
558 |
goto out; |
559 |
new_entry->original_name = saved_original_name; |
560 |
new_entry->aliased_name = saved_aliased_name; |
561 |
list1_add_tail_mb(&new_entry->list, &ccs_alias_list); |
562 |
error = 0; |
563 |
out: |
564 |
mutex_unlock(&lock); |
565 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
566 |
return error; |
567 |
} |
568 |
|
569 |
/** |
570 |
* ccs_read_alias_policy - Read "struct ccs_alias_entry" list. |
571 |
* |
572 |
* @head: Pointer to "struct ccs_io_buffer". |
573 |
* |
574 |
* Returns true on success, false otherwise. |
575 |
*/ |
576 |
bool ccs_read_alias_policy(struct ccs_io_buffer *head) |
577 |
{ |
578 |
struct list1_head *pos; |
579 |
list1_for_each_cookie(pos, head->read_var2, &ccs_alias_list) { |
580 |
struct ccs_alias_entry *ptr; |
581 |
ptr = list1_entry(pos, struct ccs_alias_entry, list); |
582 |
if (ptr->is_deleted) |
583 |
continue; |
584 |
if (!ccs_io_printf(head, KEYWORD_ALIAS "%s %s\n", |
585 |
ptr->original_name->name, |
586 |
ptr->aliased_name->name)) |
587 |
goto out; |
588 |
} |
589 |
return true; |
590 |
out: |
591 |
return false; |
592 |
} |
593 |
|
594 |
/** |
595 |
* ccs_write_alias_policy - Write "struct ccs_alias_entry" list. |
596 |
* |
597 |
* @data: String to parse. |
598 |
* @is_delete: True if it is a delete request. |
599 |
* |
600 |
* Returns 0 on success, negative value otherwise. |
601 |
*/ |
602 |
int ccs_write_alias_policy(char *data, const bool is_delete) |
603 |
{ |
604 |
char *cp = strchr(data, ' '); |
605 |
if (!cp) |
606 |
return -EINVAL; |
607 |
*cp++ = '\0'; |
608 |
return ccs_update_alias_entry(data, cp, is_delete); |
609 |
} |
610 |
|
611 |
/* The list for "struct ccs_aggregator_entry". */ |
612 |
static LIST1_HEAD(ccs_aggregator_list); |
613 |
|
614 |
/** |
615 |
* ccs_update_aggregator_entry - Update "struct ccs_aggregator_entry" list. |
616 |
* |
617 |
* @original_name: The original program's name. |
618 |
* @aggregated_name: The aggregated program's name. |
619 |
* @is_delete: True if it is a delete request. |
620 |
* |
621 |
* Returns 0 on success, negative value otherwise. |
622 |
*/ |
623 |
static int ccs_update_aggregator_entry(const char *original_name, |
624 |
const char *aggregated_name, |
625 |
const bool is_delete) |
626 |
{ |
627 |
struct ccs_aggregator_entry *new_entry; |
628 |
struct ccs_aggregator_entry *ptr; |
629 |
static DEFINE_MUTEX(lock); |
630 |
const struct ccs_path_info *saved_original_name; |
631 |
const struct ccs_path_info *saved_aggregated_name; |
632 |
int error = -ENOMEM; |
633 |
if (!ccs_is_correct_path(original_name, 1, 0, -1, __func__) || |
634 |
!ccs_is_correct_path(aggregated_name, 1, -1, -1, __func__)) |
635 |
return -EINVAL; |
636 |
saved_original_name = ccs_save_name(original_name); |
637 |
saved_aggregated_name = ccs_save_name(aggregated_name); |
638 |
if (!saved_original_name || !saved_aggregated_name) |
639 |
return -ENOMEM; |
640 |
mutex_lock(&lock); |
641 |
list1_for_each_entry(ptr, &ccs_aggregator_list, list) { |
642 |
if (ptr->original_name != saved_original_name || |
643 |
ptr->aggregated_name != saved_aggregated_name) |
644 |
continue; |
645 |
ptr->is_deleted = is_delete; |
646 |
error = 0; |
647 |
goto out; |
648 |
} |
649 |
if (is_delete) { |
650 |
error = -ENOENT; |
651 |
goto out; |
652 |
} |
653 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
654 |
if (!new_entry) |
655 |
goto out; |
656 |
new_entry->original_name = saved_original_name; |
657 |
new_entry->aggregated_name = saved_aggregated_name; |
658 |
list1_add_tail_mb(&new_entry->list, &ccs_aggregator_list); |
659 |
error = 0; |
660 |
out: |
661 |
mutex_unlock(&lock); |
662 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
663 |
return error; |
664 |
} |
665 |
|
666 |
/** |
667 |
* ccs_read_aggregator_policy - Read "struct ccs_aggregator_entry" list. |
668 |
* |
669 |
* @head: Pointer to "struct ccs_io_buffer". |
670 |
* |
671 |
* Returns true on success, false otherwise. |
672 |
*/ |
673 |
bool ccs_read_aggregator_policy(struct ccs_io_buffer *head) |
674 |
{ |
675 |
struct list1_head *pos; |
676 |
list1_for_each_cookie(pos, head->read_var2, &ccs_aggregator_list) { |
677 |
struct ccs_aggregator_entry *ptr; |
678 |
ptr = list1_entry(pos, struct ccs_aggregator_entry, list); |
679 |
if (ptr->is_deleted) |
680 |
continue; |
681 |
if (!ccs_io_printf(head, KEYWORD_AGGREGATOR "%s %s\n", |
682 |
ptr->original_name->name, |
683 |
ptr->aggregated_name->name)) |
684 |
goto out; |
685 |
} |
686 |
return true; |
687 |
out: |
688 |
return false; |
689 |
} |
690 |
|
691 |
/** |
692 |
* ccs_write_aggregator_policy - Write "struct ccs_aggregator_entry" list. |
693 |
* |
694 |
* @data: String to parse. |
695 |
* @is_delete: True if it is a delete request. |
696 |
* |
697 |
* Returns 0 on success, negative value otherwise. |
698 |
*/ |
699 |
int ccs_write_aggregator_policy(char *data, const bool is_delete) |
700 |
{ |
701 |
char *cp = strchr(data, ' '); |
702 |
if (!cp) |
703 |
return -EINVAL; |
704 |
*cp++ = '\0'; |
705 |
return ccs_update_aggregator_entry(data, cp, is_delete); |
706 |
} |
707 |
|
708 |
/* Domain create/delete/undelete handler. */ |
709 |
|
710 |
/* #define DEBUG_DOMAIN_UNDELETE */ |
711 |
|
712 |
/** |
713 |
* ccs_delete_domain - Delete a domain. |
714 |
* |
715 |
* @domainname: The name of domain. |
716 |
* |
717 |
* Returns 0. |
718 |
*/ |
719 |
int ccs_delete_domain(char *domainname) |
720 |
{ |
721 |
struct domain_info *domain; |
722 |
struct ccs_path_info name; |
723 |
name.name = domainname; |
724 |
ccs_fill_path_info(&name); |
725 |
mutex_lock(&ccs_domain_list_lock); |
726 |
#ifdef DEBUG_DOMAIN_UNDELETE |
727 |
printk(KERN_DEBUG "ccs_delete_domain %s\n", domainname); |
728 |
list1_for_each_entry(domain, &ccs_domain_list, list) { |
729 |
if (ccs_pathcmp(domain->domainname, &name)) |
730 |
continue; |
731 |
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); |
732 |
} |
733 |
#endif |
734 |
/* Is there an active domain? */ |
735 |
list1_for_each_entry(domain, &ccs_domain_list, list) { |
736 |
struct domain_info *domain2; |
737 |
/* Never delete KERNEL_DOMAIN */ |
738 |
if (domain == &KERNEL_DOMAIN) |
739 |
continue; |
740 |
if (domain->is_deleted || |
741 |
ccs_pathcmp(domain->domainname, &name)) |
742 |
continue; |
743 |
/* Mark already deleted domains as non undeletable. */ |
744 |
list1_for_each_entry(domain2, &ccs_domain_list, list) { |
745 |
if (!domain2->is_deleted || |
746 |
ccs_pathcmp(domain2->domainname, &name)) |
747 |
continue; |
748 |
#ifdef DEBUG_DOMAIN_UNDELETE |
749 |
if (domain2->is_deleted != 255) |
750 |
printk(KERN_DEBUG |
751 |
"Marked %p as non undeletable\n", |
752 |
domain2); |
753 |
#endif |
754 |
domain2->is_deleted = 255; |
755 |
} |
756 |
/* Delete and mark active domain as undeletable. */ |
757 |
domain->is_deleted = 1; |
758 |
#ifdef DEBUG_DOMAIN_UNDELETE |
759 |
printk(KERN_DEBUG "Marked %p as undeletable\n", domain); |
760 |
#endif |
761 |
break; |
762 |
} |
763 |
mutex_unlock(&ccs_domain_list_lock); |
764 |
return 0; |
765 |
} |
766 |
|
767 |
/** |
768 |
* ccs_undelete_domain - Undelete a domain. |
769 |
* |
770 |
* @domainname: The name of domain. |
771 |
* |
772 |
* Returns pointer to "struct domain_info" on success, NULL otherwise. |
773 |
*/ |
774 |
struct domain_info *ccs_undelete_domain(const char *domainname) |
775 |
{ |
776 |
struct domain_info *domain; |
777 |
struct domain_info *candidate_domain = NULL; |
778 |
struct ccs_path_info name; |
779 |
name.name = domainname; |
780 |
ccs_fill_path_info(&name); |
781 |
mutex_lock(&ccs_domain_list_lock); |
782 |
#ifdef DEBUG_DOMAIN_UNDELETE |
783 |
printk(KERN_DEBUG "ccs_undelete_domain %s\n", domainname); |
784 |
list1_for_each_entry(domain, &ccs_domain_list, list) { |
785 |
if (ccs_pathcmp(domain->domainname, &name)) |
786 |
continue; |
787 |
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); |
788 |
} |
789 |
#endif |
790 |
list1_for_each_entry(domain, &ccs_domain_list, list) { |
791 |
if (ccs_pathcmp(&name, domain->domainname)) |
792 |
continue; |
793 |
if (!domain->is_deleted) { |
794 |
/* This domain is active. I can't undelete. */ |
795 |
candidate_domain = NULL; |
796 |
#ifdef DEBUG_DOMAIN_UNDELETE |
797 |
printk(KERN_DEBUG "%p is active. I can't undelete.\n", |
798 |
domain); |
799 |
#endif |
800 |
break; |
801 |
} |
802 |
/* Is this domain undeletable? */ |
803 |
if (domain->is_deleted == 1) |
804 |
candidate_domain = domain; |
805 |
} |
806 |
if (candidate_domain) { |
807 |
candidate_domain->is_deleted = 0; |
808 |
#ifdef DEBUG_DOMAIN_UNDELETE |
809 |
printk(KERN_DEBUG "%p was undeleted.\n", candidate_domain); |
810 |
#endif |
811 |
} |
812 |
mutex_unlock(&ccs_domain_list_lock); |
813 |
return candidate_domain; |
814 |
} |
815 |
|
816 |
/** |
817 |
* ccs_find_or_assign_new_domain - Create a domain. |
818 |
* |
819 |
* @domainname: The name of domain. |
820 |
* @profile: Profile number to assign if the domain was newly created. |
821 |
* |
822 |
* Returns pointer to "struct domain_info" on success, NULL otherwise. |
823 |
*/ |
824 |
struct domain_info *ccs_find_or_assign_new_domain(const char *domainname, |
825 |
const u8 profile) |
826 |
{ |
827 |
struct domain_info *domain = NULL; |
828 |
const struct ccs_path_info *saved_domainname; |
829 |
mutex_lock(&ccs_domain_list_lock); |
830 |
domain = ccs_find_domain(domainname); |
831 |
if (domain) |
832 |
goto out; |
833 |
if (!ccs_is_correct_domain(domainname, __func__)) |
834 |
goto out; |
835 |
saved_domainname = ccs_save_name(domainname); |
836 |
if (!saved_domainname) |
837 |
goto out; |
838 |
/* Can I reuse memory of deleted domain? */ |
839 |
list1_for_each_entry(domain, &ccs_domain_list, list) { |
840 |
struct task_struct *p; |
841 |
struct ccs_acl_info *ptr; |
842 |
bool flag; |
843 |
if (!domain->is_deleted || |
844 |
domain->domainname != saved_domainname) |
845 |
continue; |
846 |
flag = false; |
847 |
/***** CRITICAL SECTION START *****/ |
848 |
read_lock(&tasklist_lock); |
849 |
for_each_process(p) { |
850 |
if (p->domain_info != domain) |
851 |
continue; |
852 |
flag = true; |
853 |
break; |
854 |
} |
855 |
read_unlock(&tasklist_lock); |
856 |
/***** CRITICAL SECTION END *****/ |
857 |
if (flag) |
858 |
continue; |
859 |
#ifdef DEBUG_DOMAIN_UNDELETE |
860 |
printk(KERN_DEBUG "Reusing %p %s\n", domain, |
861 |
domain->domainname->name); |
862 |
#endif |
863 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
864 |
ptr->type |= ACL_DELETED; |
865 |
} |
866 |
ccs_set_domain_flag(domain, true, domain->flags); |
867 |
domain->profile = profile; |
868 |
domain->quota_warned = false; |
869 |
mb(); /* Avoid out-of-order execution. */ |
870 |
domain->is_deleted = 0; |
871 |
goto out; |
872 |
} |
873 |
/* No memory reusable. Create using new memory. */ |
874 |
domain = ccs_alloc_element(sizeof(*domain)); |
875 |
if (domain) { |
876 |
INIT_LIST1_HEAD(&domain->acl_info_list); |
877 |
domain->domainname = saved_domainname; |
878 |
domain->profile = profile; |
879 |
list1_add_tail_mb(&domain->list, &ccs_domain_list); |
880 |
} |
881 |
out: |
882 |
mutex_unlock(&ccs_domain_list_lock); |
883 |
return domain; |
884 |
} |
885 |
|
886 |
/** |
887 |
* ccs_get_argv0 - Get argv[0]. |
888 |
* |
889 |
* @ee: Pointer to "struct ccs_execve_entry". |
890 |
* |
891 |
* Returns true on success, false otherwise. |
892 |
*/ |
893 |
static bool ccs_get_argv0(struct ccs_execve_entry *ee) |
894 |
{ |
895 |
struct linux_binprm *bprm = ee->bprm; |
896 |
char *arg_ptr = ee->tmp; |
897 |
int arg_len = 0; |
898 |
unsigned long pos = bprm->p; |
899 |
int offset = pos % PAGE_SIZE; |
900 |
bool done = false; |
901 |
if (!bprm->argc) |
902 |
goto out; |
903 |
while (1) { |
904 |
if (!ccs_dump_page(bprm, pos, &ee->dump)) |
905 |
goto out; |
906 |
pos += PAGE_SIZE - offset; |
907 |
/* Read. */ |
908 |
while (offset < PAGE_SIZE) { |
909 |
const char *kaddr = ee->dump.data; |
910 |
const unsigned char c = kaddr[offset++]; |
911 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
912 |
if (c == '\\') { |
913 |
arg_ptr[arg_len++] = '\\'; |
914 |
arg_ptr[arg_len++] = '\\'; |
915 |
} else if (c == '/') { |
916 |
arg_len = 0; |
917 |
} else if (c > ' ' && c < 127) { |
918 |
arg_ptr[arg_len++] = c; |
919 |
} else { |
920 |
arg_ptr[arg_len++] = '\\'; |
921 |
arg_ptr[arg_len++] = (c >> 6) + '0'; |
922 |
arg_ptr[arg_len++] |
923 |
= ((c >> 3) & 7) + '0'; |
924 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
925 |
} |
926 |
} else { |
927 |
arg_ptr[arg_len] = '\0'; |
928 |
done = true; |
929 |
break; |
930 |
} |
931 |
} |
932 |
offset = 0; |
933 |
if (done) |
934 |
break; |
935 |
} |
936 |
return true; |
937 |
out: |
938 |
return false; |
939 |
} |
940 |
|
941 |
/** |
942 |
* ccs_find_next_domain - Find a domain. |
943 |
* |
944 |
* @ee: Pointer to "struct ccs_execve_entry". |
945 |
* |
946 |
* Returns 0 on success, negative value otherwise. |
947 |
*/ |
948 |
static int ccs_find_next_domain(struct ccs_execve_entry *ee) |
949 |
{ |
950 |
struct ccs_request_info *r = &ee->r; |
951 |
const struct ccs_path_info *handler = ee->handler; |
952 |
struct domain_info *domain = NULL; |
953 |
const char *old_domain_name = r->domain->domainname->name; |
954 |
struct linux_binprm *bprm = ee->bprm; |
955 |
const u8 mode = r->mode; |
956 |
const bool is_enforce = (mode == 3); |
957 |
const u32 tomoyo_flags = current->tomoyo_flags; |
958 |
char *new_domain_name = NULL; |
959 |
struct ccs_path_info rn; /* real name */ |
960 |
struct ccs_path_info sn; /* symlink name */ |
961 |
struct ccs_path_info ln; /* last name */ |
962 |
int retval; |
963 |
|
964 |
{ |
965 |
/* |
966 |
* Built-in initializers. This is needed because policies are |
967 |
* not loaded until starting /sbin/init. |
968 |
*/ |
969 |
static bool first = true; |
970 |
if (first) { |
971 |
ccs_update_domain_initializer_entry(NULL, |
972 |
"/sbin/hotplug", |
973 |
false, false); |
974 |
ccs_update_domain_initializer_entry(NULL, |
975 |
"/sbin/modprobe", |
976 |
false, false); |
977 |
first = false; |
978 |
} |
979 |
} |
980 |
|
981 |
retry: |
982 |
current->tomoyo_flags = tomoyo_flags; |
983 |
r->cond = NULL; |
984 |
/* Get realpath of program and symbolic link. */ |
985 |
retval = ccs_realpath_both(bprm->filename, ee); |
986 |
if (retval < 0) |
987 |
goto out; |
988 |
|
989 |
rn.name = ee->program_path; |
990 |
ccs_fill_path_info(&rn); |
991 |
sn.name = ee->tmp; |
992 |
ccs_fill_path_info(&sn); |
993 |
ln.name = ccs_get_last_name(r->domain); |
994 |
ccs_fill_path_info(&ln); |
995 |
|
996 |
if (handler) { |
997 |
if (ccs_pathcmp(&rn, handler)) { |
998 |
/* Failed to verify execute handler. */ |
999 |
static u8 counter = 20; |
1000 |
if (counter) { |
1001 |
counter--; |
1002 |
printk(KERN_WARNING "Failed to verify: %s\n", |
1003 |
handler->name); |
1004 |
} |
1005 |
goto out; |
1006 |
} |
1007 |
goto calculate_domain; |
1008 |
} |
1009 |
|
1010 |
/* Check 'alias' directive. */ |
1011 |
if (ccs_pathcmp(&rn, &sn)) { |
1012 |
struct ccs_alias_entry *ptr; |
1013 |
/* Is this program allowed to be called via symbolic links? */ |
1014 |
list1_for_each_entry(ptr, &ccs_alias_list, list) { |
1015 |
if (ptr->is_deleted || |
1016 |
ccs_pathcmp(&rn, ptr->original_name) || |
1017 |
ccs_pathcmp(&sn, ptr->aliased_name)) |
1018 |
continue; |
1019 |
strncpy(ee->program_path, ptr->aliased_name->name, |
1020 |
CCS_MAX_PATHNAME_LEN - 1); |
1021 |
ccs_fill_path_info(&rn); |
1022 |
break; |
1023 |
} |
1024 |
} |
1025 |
/* sn will be overwritten after here. */ |
1026 |
|
1027 |
/* Compare basename of program_path and argv[0] */ |
1028 |
r->mode = ccs_check_flags(r->domain, CCS_TOMOYO_MAC_FOR_ARGV0); |
1029 |
if (bprm->argc > 0 && r->mode) { |
1030 |
char *base_argv0 = ee->tmp; |
1031 |
const char *base_filename; |
1032 |
retval = -ENOMEM; |
1033 |
if (!ccs_get_argv0(ee)) |
1034 |
goto out; |
1035 |
base_filename = strrchr(ee->program_path, '/'); |
1036 |
if (!base_filename) |
1037 |
base_filename = ee->program_path; |
1038 |
else |
1039 |
base_filename++; |
1040 |
if (strcmp(base_argv0, base_filename)) { |
1041 |
retval = ccs_check_argv0_perm(r, &rn, base_argv0); |
1042 |
if (retval == 1) |
1043 |
goto retry; |
1044 |
if (retval < 0) |
1045 |
goto out; |
1046 |
} |
1047 |
} |
1048 |
|
1049 |
/* Check 'aggregator' directive. */ |
1050 |
{ |
1051 |
struct ccs_aggregator_entry *ptr; |
1052 |
/* Is this program allowed to be aggregated? */ |
1053 |
list1_for_each_entry(ptr, &ccs_aggregator_list, list) { |
1054 |
if (ptr->is_deleted || |
1055 |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
1056 |
continue; |
1057 |
strncpy(ee->program_path, ptr->aggregated_name->name, |
1058 |
CCS_MAX_PATHNAME_LEN - 1); |
1059 |
ccs_fill_path_info(&rn); |
1060 |
break; |
1061 |
} |
1062 |
} |
1063 |
|
1064 |
/* Check execute permission. */ |
1065 |
r->mode = mode; |
1066 |
retval = ccs_check_exec_perm(r, &rn); |
1067 |
if (retval == 1) |
1068 |
goto retry; |
1069 |
if (retval < 0) |
1070 |
goto out; |
1071 |
|
1072 |
calculate_domain: |
1073 |
new_domain_name = ee->tmp; |
1074 |
if (ccs_is_domain_initializer(r->domain->domainname, &rn, &ln)) { |
1075 |
/* Transit to the child of KERNEL_DOMAIN domain. */ |
1076 |
snprintf(new_domain_name, CCS_EXEC_TMPSIZE - 1, |
1077 |
ROOT_NAME " " "%s", ee->program_path); |
1078 |
} else if (r->domain == &KERNEL_DOMAIN && !ccs_policy_loaded) { |
1079 |
/* |
1080 |
* Needn't to transit from kernel domain before starting |
1081 |
* /sbin/init. But transit from kernel domain if executing |
1082 |
* initializers because they might start before /sbin/init. |
1083 |
*/ |
1084 |
domain = r->domain; |
1085 |
} else if (ccs_is_domain_keeper(r->domain->domainname, &rn, &ln)) { |
1086 |
/* Keep current domain. */ |
1087 |
domain = r->domain; |
1088 |
} else { |
1089 |
/* Normal domain transition. */ |
1090 |
snprintf(new_domain_name, CCS_EXEC_TMPSIZE - 1, |
1091 |
"%s %s", old_domain_name, ee->program_path); |
1092 |
} |
1093 |
if (domain || strlen(new_domain_name) >= CCS_MAX_PATHNAME_LEN) |
1094 |
goto done; |
1095 |
domain = ccs_find_domain(new_domain_name); |
1096 |
if (domain) |
1097 |
goto done; |
1098 |
if (is_enforce) { |
1099 |
int error = ccs_check_supervisor(r, |
1100 |
"# wants to create domain\n" |
1101 |
"%s\n", new_domain_name); |
1102 |
if (error == 1) |
1103 |
goto retry; |
1104 |
if (error < 0) |
1105 |
goto done; |
1106 |
} |
1107 |
domain = ccs_find_or_assign_new_domain(new_domain_name, r->profile); |
1108 |
if (domain) |
1109 |
ccs_audit_domain_creation_log(domain); |
1110 |
done: |
1111 |
if (!domain) { |
1112 |
printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", |
1113 |
new_domain_name); |
1114 |
if (is_enforce) |
1115 |
retval = -EPERM; |
1116 |
else { |
1117 |
retval = 0; |
1118 |
ccs_set_domain_flag(r->domain, false, |
1119 |
DOMAIN_FLAGS_TRANSITION_FAILED); |
1120 |
} |
1121 |
} else { |
1122 |
retval = 0; |
1123 |
} |
1124 |
out: |
1125 |
if (domain) |
1126 |
r->domain = domain; |
1127 |
return retval; |
1128 |
} |
1129 |
|
1130 |
/** |
1131 |
* ccs_check_environ - Check permission for environment variable names. |
1132 |
* |
1133 |
* @ee: Pointer to "struct ccs_execve_entry". |
1134 |
* |
1135 |
* Returns 0 on success, negative value otherwise. |
1136 |
*/ |
1137 |
static int ccs_check_environ(struct ccs_execve_entry *ee) |
1138 |
{ |
1139 |
struct ccs_request_info *r = &ee->r; |
1140 |
struct linux_binprm *bprm = ee->bprm; |
1141 |
char *arg_ptr = ee->tmp; |
1142 |
int arg_len = 0; |
1143 |
unsigned long pos = bprm->p; |
1144 |
int offset = pos % PAGE_SIZE; |
1145 |
int argv_count = bprm->argc; |
1146 |
int envp_count = bprm->envc; |
1147 |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
1148 |
int error = -ENOMEM; |
1149 |
if (!r->mode || !envp_count) |
1150 |
return 0; |
1151 |
while (error == -ENOMEM) { |
1152 |
if (!ccs_dump_page(bprm, pos, &ee->dump)) |
1153 |
goto out; |
1154 |
pos += PAGE_SIZE - offset; |
1155 |
/* Read. */ |
1156 |
while (argv_count && offset < PAGE_SIZE) { |
1157 |
const char *kaddr = ee->dump.data; |
1158 |
if (!kaddr[offset++]) |
1159 |
argv_count--; |
1160 |
} |
1161 |
if (argv_count) { |
1162 |
offset = 0; |
1163 |
continue; |
1164 |
} |
1165 |
while (offset < PAGE_SIZE) { |
1166 |
const char *kaddr = ee->dump.data; |
1167 |
const unsigned char c = kaddr[offset++]; |
1168 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
1169 |
if (c == '=') { |
1170 |
arg_ptr[arg_len++] = '\0'; |
1171 |
} else if (c == '\\') { |
1172 |
arg_ptr[arg_len++] = '\\'; |
1173 |
arg_ptr[arg_len++] = '\\'; |
1174 |
} else if (c > ' ' && c < 127) { |
1175 |
arg_ptr[arg_len++] = c; |
1176 |
} else { |
1177 |
arg_ptr[arg_len++] = '\\'; |
1178 |
arg_ptr[arg_len++] = (c >> 6) + '0'; |
1179 |
arg_ptr[arg_len++] |
1180 |
= ((c >> 3) & 7) + '0'; |
1181 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
1182 |
} |
1183 |
} else { |
1184 |
arg_ptr[arg_len] = '\0'; |
1185 |
} |
1186 |
if (c) |
1187 |
continue; |
1188 |
if (ccs_check_env_perm(r, arg_ptr)) { |
1189 |
error = -EPERM; |
1190 |
break; |
1191 |
} |
1192 |
if (!--envp_count) { |
1193 |
error = 0; |
1194 |
break; |
1195 |
} |
1196 |
arg_len = 0; |
1197 |
} |
1198 |
offset = 0; |
1199 |
} |
1200 |
out: |
1201 |
if (r->mode != 3) |
1202 |
error = 0; |
1203 |
return error; |
1204 |
} |
1205 |
|
1206 |
/** |
1207 |
* ccs_unescape - Unescape escaped string. |
1208 |
* |
1209 |
* @dest: String to unescape. |
1210 |
* |
1211 |
* Returns nothing. |
1212 |
*/ |
1213 |
static void ccs_unescape(unsigned char *dest) |
1214 |
{ |
1215 |
unsigned char *src = dest; |
1216 |
unsigned char c; |
1217 |
unsigned char d; |
1218 |
unsigned char e; |
1219 |
while (1) { |
1220 |
c = *src++; |
1221 |
if (!c) |
1222 |
break; |
1223 |
if (c != '\\') { |
1224 |
*dest++ = c; |
1225 |
continue; |
1226 |
} |
1227 |
c = *src++; |
1228 |
if (c == '\\') { |
1229 |
*dest++ = c; |
1230 |
continue; |
1231 |
} |
1232 |
if (c < '0' || c > '3') |
1233 |
break; |
1234 |
d = *src++; |
1235 |
if (d < '0' || d > '7') |
1236 |
break; |
1237 |
e = *src++; |
1238 |
if (e < '0' || e > '7') |
1239 |
break; |
1240 |
*dest++ = ((c - '0') << 6) + ((d - '0') << 3) + (e - '0'); |
1241 |
} |
1242 |
*dest = '\0'; |
1243 |
} |
1244 |
|
1245 |
/** |
1246 |
* ccs_root_depth - Get number of directories to strip. |
1247 |
* |
1248 |
* @dentry: Pointer to "struct dentry". |
1249 |
* @vfsmnt: Pointer to "struct vfsmount". |
1250 |
* |
1251 |
* Returns number of directories to strip. |
1252 |
*/ |
1253 |
static inline int ccs_root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
1254 |
{ |
1255 |
int depth = 0; |
1256 |
/***** CRITICAL SECTION START *****/ |
1257 |
ccs_realpath_lock(); |
1258 |
for (;;) { |
1259 |
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
1260 |
/* Global root? */ |
1261 |
if (vfsmnt->mnt_parent == vfsmnt) |
1262 |
break; |
1263 |
dentry = vfsmnt->mnt_mountpoint; |
1264 |
vfsmnt = vfsmnt->mnt_parent; |
1265 |
continue; |
1266 |
} |
1267 |
dentry = dentry->d_parent; |
1268 |
depth++; |
1269 |
} |
1270 |
ccs_realpath_unlock(); |
1271 |
/***** CRITICAL SECTION END *****/ |
1272 |
return depth; |
1273 |
} |
1274 |
|
1275 |
/** |
1276 |
* ccs_get_root_depth - return the depth of root directory. |
1277 |
* |
1278 |
* Returns number of directories to strip. |
1279 |
*/ |
1280 |
static int ccs_get_root_depth(void) |
1281 |
{ |
1282 |
int depth; |
1283 |
struct dentry *dentry; |
1284 |
struct vfsmount *vfsmnt; |
1285 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1286 |
struct path root; |
1287 |
#endif |
1288 |
/***** CRITICAL SECTION START *****/ |
1289 |
read_lock(¤t->fs->lock); |
1290 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1291 |
root = current->fs->root; |
1292 |
path_get(¤t->fs->root); |
1293 |
dentry = root.dentry; |
1294 |
vfsmnt = root.mnt; |
1295 |
#else |
1296 |
dentry = dget(current->fs->root); |
1297 |
vfsmnt = mntget(current->fs->rootmnt); |
1298 |
#endif |
1299 |
read_unlock(¤t->fs->lock); |
1300 |
/***** CRITICAL SECTION END *****/ |
1301 |
depth = ccs_root_depth(dentry, vfsmnt); |
1302 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1303 |
path_put(&root); |
1304 |
#else |
1305 |
dput(dentry); |
1306 |
mntput(vfsmnt); |
1307 |
#endif |
1308 |
return depth; |
1309 |
} |
1310 |
|
1311 |
static LIST_HEAD(ccs_execve_list); |
1312 |
static DEFINE_SPINLOCK(ccs_execve_list_lock); |
1313 |
|
1314 |
/** |
1315 |
* ccs_allocate_execve_entry - Allocate memory for execve(). |
1316 |
* |
1317 |
* Returns pointer to "struct ccs_execve_entry" on success, NULL otherwise. |
1318 |
*/ |
1319 |
static struct ccs_execve_entry *ccs_allocate_execve_entry(void) |
1320 |
{ |
1321 |
struct ccs_execve_entry *ee = ccs_alloc(sizeof(*ee), false); |
1322 |
if (!ee) |
1323 |
return NULL; |
1324 |
memset(ee, 0, sizeof(*ee)); |
1325 |
ee->program_path = ccs_alloc(CCS_MAX_PATHNAME_LEN, false); |
1326 |
ee->tmp = ccs_alloc(CCS_MAX_PATHNAME_LEN, false); |
1327 |
if (!ee->program_path || !ee->tmp) { |
1328 |
ccs_free(ee->program_path); |
1329 |
ccs_free(ee->tmp); |
1330 |
ccs_free(ee); |
1331 |
return NULL; |
1332 |
} |
1333 |
/* ee->dump->data is allocated by ccs_dump_page(). */ |
1334 |
ee->task = current; |
1335 |
/***** CRITICAL SECTION START *****/ |
1336 |
spin_lock(&ccs_execve_list_lock); |
1337 |
list_add(&ee->list, &ccs_execve_list); |
1338 |
spin_unlock(&ccs_execve_list_lock); |
1339 |
/***** CRITICAL SECTION END *****/ |
1340 |
return ee; |
1341 |
} |
1342 |
|
1343 |
/** |
1344 |
* ccs_find_execve_entry - Find ccs_execve_entry of current process. |
1345 |
* |
1346 |
* Returns pointer to "struct ccs_execve_entry" on success, NULL otherwise. |
1347 |
*/ |
1348 |
static struct ccs_execve_entry *ccs_find_execve_entry(void) |
1349 |
{ |
1350 |
struct task_struct *task = current; |
1351 |
struct ccs_execve_entry *ee = NULL; |
1352 |
struct ccs_execve_entry *p; |
1353 |
/***** CRITICAL SECTION START *****/ |
1354 |
spin_lock(&ccs_execve_list_lock); |
1355 |
list_for_each_entry(p, &ccs_execve_list, list) { |
1356 |
if (p->task != task) |
1357 |
continue; |
1358 |
ee = p; |
1359 |
break; |
1360 |
} |
1361 |
spin_unlock(&ccs_execve_list_lock); |
1362 |
/***** CRITICAL SECTION END *****/ |
1363 |
return ee; |
1364 |
} |
1365 |
|
1366 |
/** |
1367 |
* ccs_free_execve_entry - Free memory for execve(). |
1368 |
* |
1369 |
* @ee: Pointer to "struct ccs_execve_entry". |
1370 |
*/ |
1371 |
static void ccs_free_execve_entry(struct ccs_execve_entry *ee) |
1372 |
{ |
1373 |
if (!ee) |
1374 |
return; |
1375 |
/***** CRITICAL SECTION START *****/ |
1376 |
spin_lock(&ccs_execve_list_lock); |
1377 |
list_del(&ee->list); |
1378 |
spin_unlock(&ccs_execve_list_lock); |
1379 |
/***** CRITICAL SECTION END *****/ |
1380 |
ccs_free(ee->program_path); |
1381 |
ccs_free(ee->tmp); |
1382 |
kfree(ee->dump.data); |
1383 |
ccs_free(ee); |
1384 |
} |
1385 |
|
1386 |
/** |
1387 |
* ccs_try_alt_exec - Try to start execute handler. |
1388 |
* |
1389 |
* @ee: Pointer to "struct ccs_execve_entry". |
1390 |
* |
1391 |
* Returns 0 on success, negative value otherwise. |
1392 |
*/ |
1393 |
static int ccs_try_alt_exec(struct ccs_execve_entry *ee) |
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 linux_binprm *bprm = ee->bprm; |
1432 |
struct file *filp; |
1433 |
int retval; |
1434 |
const int original_argc = bprm->argc; |
1435 |
const int original_envc = bprm->envc; |
1436 |
struct task_struct *task = current; |
1437 |
|
1438 |
/* Close the requested program's dentry. */ |
1439 |
allow_write_access(bprm->file); |
1440 |
fput(bprm->file); |
1441 |
bprm->file = NULL; |
1442 |
|
1443 |
/* Invalidate page dump cache. */ |
1444 |
ee->dump.page = NULL; |
1445 |
|
1446 |
/* Move envp[] to argv[] */ |
1447 |
bprm->argc += bprm->envc; |
1448 |
bprm->envc = 0; |
1449 |
|
1450 |
/* Set argv[6] */ |
1451 |
{ |
1452 |
char *cp = ee->tmp; |
1453 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); |
1454 |
retval = copy_strings_kernel(1, &cp, bprm); |
1455 |
if (retval < 0) |
1456 |
goto out; |
1457 |
bprm->argc++; |
1458 |
} |
1459 |
|
1460 |
/* Set argv[5] */ |
1461 |
{ |
1462 |
char *cp = ee->tmp; |
1463 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); |
1464 |
retval = copy_strings_kernel(1, &cp, bprm); |
1465 |
if (retval < 0) |
1466 |
goto out; |
1467 |
bprm->argc++; |
1468 |
} |
1469 |
|
1470 |
/* Set argv[4] */ |
1471 |
{ |
1472 |
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
1473 |
if (retval < 0) |
1474 |
goto out; |
1475 |
bprm->argc++; |
1476 |
} |
1477 |
|
1478 |
/* Set argv[3] */ |
1479 |
{ |
1480 |
char *cp = ee->tmp; |
1481 |
const u32 tomoyo_flags = task->tomoyo_flags; |
1482 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, |
1483 |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
1484 |
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
1485 |
"state[1]=%u state[2]=%u", |
1486 |
(pid_t) sys_getpid(), current_uid(), current_gid(), |
1487 |
current_euid(), current_egid(), current_suid(), |
1488 |
current_sgid(), current_fsuid(), current_fsgid(), |
1489 |
(u8) (tomoyo_flags >> 24), (u8) (tomoyo_flags >> 16), |
1490 |
(u8) (tomoyo_flags >> 8)); |
1491 |
retval = copy_strings_kernel(1, &cp, bprm); |
1492 |
if (retval < 0) |
1493 |
goto out; |
1494 |
bprm->argc++; |
1495 |
} |
1496 |
|
1497 |
/* Set argv[2] */ |
1498 |
{ |
1499 |
char *exe = (char *) ccs_get_exe(); |
1500 |
if (exe) { |
1501 |
retval = copy_strings_kernel(1, &exe, bprm); |
1502 |
ccs_free(exe); |
1503 |
} else { |
1504 |
exe = ee->tmp; |
1505 |
strncpy(ee->tmp, "<unknown>", CCS_EXEC_TMPSIZE - 1); |
1506 |
retval = copy_strings_kernel(1, &exe, bprm); |
1507 |
} |
1508 |
if (retval < 0) |
1509 |
goto out; |
1510 |
bprm->argc++; |
1511 |
} |
1512 |
|
1513 |
/* Set argv[1] */ |
1514 |
{ |
1515 |
char *cp = ee->tmp; |
1516 |
strncpy(ee->tmp, task->domain_info->domainname->name, |
1517 |
CCS_EXEC_TMPSIZE - 1); |
1518 |
retval = copy_strings_kernel(1, &cp, bprm); |
1519 |
if (retval < 0) |
1520 |
goto out; |
1521 |
bprm->argc++; |
1522 |
} |
1523 |
|
1524 |
/* Set argv[0] */ |
1525 |
{ |
1526 |
int depth = ccs_get_root_depth(); |
1527 |
char *cp = ee->program_path; |
1528 |
strncpy(cp, ee->handler->name, CCS_MAX_PATHNAME_LEN - 1); |
1529 |
ccs_unescape(cp); |
1530 |
retval = -ENOENT; |
1531 |
if (!*cp || *cp != '/') |
1532 |
goto out; |
1533 |
/* Adjust root directory for open_exec(). */ |
1534 |
while (depth) { |
1535 |
cp = strchr(cp + 1, '/'); |
1536 |
if (!cp) |
1537 |
goto out; |
1538 |
depth--; |
1539 |
} |
1540 |
memmove(ee->program_path, cp, strlen(cp) + 1); |
1541 |
cp = ee->program_path; |
1542 |
retval = copy_strings_kernel(1, &cp, 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(ee->program_path); |
1555 |
if (IS_ERR(filp)) { |
1556 |
retval = PTR_ERR(filp); |
1557 |
goto out; |
1558 |
} |
1559 |
bprm->file = filp; |
1560 |
bprm->filename = ee->program_path; |
1561 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1562 |
bprm->interp = bprm->filename; |
1563 |
#endif |
1564 |
retval = prepare_binprm(bprm); |
1565 |
if (retval < 0) |
1566 |
goto out; |
1567 |
{ |
1568 |
/* |
1569 |
* Backup ee->program_path because ccs_find_next_domain() will |
1570 |
* overwrite ee->program_path and ee->tmp. |
1571 |
*/ |
1572 |
const int len = strlen(ee->program_path) + 1; |
1573 |
char *cp = kmalloc(len, GFP_KERNEL); |
1574 |
if (!cp) { |
1575 |
retval = -ENOMEM; |
1576 |
goto out; |
1577 |
} |
1578 |
memmove(cp, ee->program_path, len); |
1579 |
bprm->filename = cp; |
1580 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1581 |
bprm->interp = bprm->filename; |
1582 |
#endif |
1583 |
task->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1584 |
retval = ccs_find_next_domain(ee); |
1585 |
task->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1586 |
/* Restore ee->program_path for search_binary_handler(). */ |
1587 |
memmove(ee->program_path, cp, len); |
1588 |
bprm->filename = ee->program_path; |
1589 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1590 |
bprm->interp = bprm->filename; |
1591 |
#endif |
1592 |
kfree(cp); |
1593 |
} |
1594 |
out: |
1595 |
return retval; |
1596 |
} |
1597 |
|
1598 |
/** |
1599 |
* ccs_find_execute_handler - Find an execute handler. |
1600 |
* |
1601 |
* @ee: Pointer to "struct ccs_execve_entry". |
1602 |
* @type: Type of execute handler. |
1603 |
* |
1604 |
* Returns true if found, false otherwise. |
1605 |
*/ |
1606 |
static bool ccs_find_execute_handler(struct ccs_execve_entry *ee, |
1607 |
const u8 type) |
1608 |
{ |
1609 |
struct task_struct *task = current; |
1610 |
const struct domain_info *domain = task->domain_info; |
1611 |
struct ccs_acl_info *ptr; |
1612 |
/* |
1613 |
* Don't use execute handler if the current process is |
1614 |
* marked as execute handler to avoid infinite execute handler loop. |
1615 |
*/ |
1616 |
if (task->tomoyo_flags & TOMOYO_TASK_IS_EXECUTE_HANDLER) |
1617 |
return false; |
1618 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
1619 |
struct ccs_execute_handler_record *acl; |
1620 |
if (ptr->type != type) |
1621 |
continue; |
1622 |
acl = container_of(ptr, struct ccs_execute_handler_record, |
1623 |
head); |
1624 |
ee->handler = acl->handler; |
1625 |
return true; |
1626 |
} |
1627 |
return false; |
1628 |
} |
1629 |
|
1630 |
/** |
1631 |
* ccs_dump_page - Dump a page to buffer. |
1632 |
* |
1633 |
* @bprm: Pointer to "struct linux_binprm". |
1634 |
* @pos: Location to dump. |
1635 |
* @dump: Poiner to "struct ccs_page_dump". |
1636 |
* |
1637 |
* Returns true on success, false otherwise. |
1638 |
*/ |
1639 |
bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, |
1640 |
struct ccs_page_dump *dump) |
1641 |
{ |
1642 |
struct page *page; |
1643 |
/* dump->data is released by ccs_free_execve_entry(). */ |
1644 |
if (!dump->data) { |
1645 |
dump->data = kmalloc(PAGE_SIZE, GFP_KERNEL); |
1646 |
if (!dump->data) |
1647 |
return false; |
1648 |
} |
1649 |
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
1650 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1651 |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1652 |
return false; |
1653 |
#else |
1654 |
page = bprm->page[pos / PAGE_SIZE]; |
1655 |
#endif |
1656 |
if (page != dump->page) { |
1657 |
const unsigned int offset = pos % PAGE_SIZE; |
1658 |
/* |
1659 |
* Maybe kmap()/kunmap() should be used here. |
1660 |
* But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). |
1661 |
* So do I. |
1662 |
*/ |
1663 |
char *kaddr = kmap_atomic(page, KM_USER0); |
1664 |
dump->page = page; |
1665 |
memcpy(dump->data + offset, kaddr + offset, PAGE_SIZE - offset); |
1666 |
kunmap_atomic(kaddr, KM_USER0); |
1667 |
} |
1668 |
/* Same with put_arg_page(page) in fs/exec.c */ |
1669 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1670 |
put_page(page); |
1671 |
#endif |
1672 |
return true; |
1673 |
} |
1674 |
|
1675 |
/** |
1676 |
* ccs_fetch_next_domain - Fetch next_domain from the list. |
1677 |
* |
1678 |
* Returns pointer to "struct domain_info" which will be used if execve() |
1679 |
* succeeds. This function does not return NULL. |
1680 |
*/ |
1681 |
struct domain_info *ccs_fetch_next_domain(void) |
1682 |
{ |
1683 |
struct ccs_execve_entry *ee = ccs_find_execve_entry(); |
1684 |
struct domain_info *next_domain = NULL; |
1685 |
if (ee) |
1686 |
next_domain = ee->next_domain; |
1687 |
if (!next_domain) |
1688 |
next_domain = current->domain_info; |
1689 |
return next_domain; |
1690 |
} |
1691 |
|
1692 |
/** |
1693 |
* ccs_start_execve - Prepare for execve() operation. |
1694 |
* |
1695 |
* @bprm: Pointer to "struct linux_binprm". |
1696 |
* |
1697 |
* Returns 0 on success, negative value otherwise. |
1698 |
*/ |
1699 |
int ccs_start_execve(struct linux_binprm *bprm) |
1700 |
{ |
1701 |
int retval; |
1702 |
struct task_struct *task = current; |
1703 |
struct ccs_execve_entry *ee = ccs_allocate_execve_entry(); |
1704 |
if (!ccs_policy_loaded) |
1705 |
ccs_load_policy(bprm->filename); |
1706 |
if (!ee) |
1707 |
return -ENOMEM; |
1708 |
ccs_init_request_info(&ee->r, NULL, CCS_TOMOYO_MAC_FOR_FILE); |
1709 |
ee->r.ee = ee; |
1710 |
ee->bprm = bprm; |
1711 |
ee->r.obj = &ee->obj; |
1712 |
ee->obj.path1_dentry = bprm->file->f_dentry; |
1713 |
ee->obj.path1_vfsmnt = bprm->file->f_vfsmnt; |
1714 |
/* Clear manager flag. */ |
1715 |
task->tomoyo_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
1716 |
if (ccs_find_execute_handler(ee, TYPE_EXECUTE_HANDLER)) { |
1717 |
retval = ccs_try_alt_exec(ee); |
1718 |
if (!retval) |
1719 |
ccs_audit_execute_handler_log(ee, true); |
1720 |
goto ok; |
1721 |
} |
1722 |
retval = ccs_find_next_domain(ee); |
1723 |
if (retval != -EPERM) |
1724 |
goto ok; |
1725 |
if (ccs_find_execute_handler(ee, TYPE_DENIED_EXECUTE_HANDLER)) { |
1726 |
retval = ccs_try_alt_exec(ee); |
1727 |
if (!retval) |
1728 |
ccs_audit_execute_handler_log(ee, false); |
1729 |
} |
1730 |
ok: |
1731 |
if (retval < 0) |
1732 |
goto out; |
1733 |
ee->r.mode = ccs_check_flags(ee->r.domain, CCS_TOMOYO_MAC_FOR_ENV); |
1734 |
retval = ccs_check_environ(ee); |
1735 |
if (retval < 0) |
1736 |
goto out; |
1737 |
ee->next_domain = ee->r.domain; |
1738 |
task->tomoyo_flags |= TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
1739 |
retval = 0; |
1740 |
out: |
1741 |
if (retval) |
1742 |
ccs_finish_execve(retval); |
1743 |
return retval; |
1744 |
} |
1745 |
|
1746 |
/** |
1747 |
* ccs_finish_execve - Clean up execve() operation. |
1748 |
* |
1749 |
* @retval: Return code of an execve() operation. |
1750 |
*/ |
1751 |
void ccs_finish_execve(int retval) |
1752 |
{ |
1753 |
struct task_struct *task = current; |
1754 |
struct ccs_execve_entry *ee = ccs_find_execve_entry(); |
1755 |
task->tomoyo_flags &= ~TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
1756 |
if (!ee) |
1757 |
return; |
1758 |
if (retval < 0) |
1759 |
goto out; |
1760 |
/* Proceed to next domain if execution suceeded. */ |
1761 |
task->domain_info = ee->r.domain; |
1762 |
mb(); /* Make domain transition visible to other CPUs. */ |
1763 |
/* Mark the current process as execute handler. */ |
1764 |
if (ee->handler) |
1765 |
task->tomoyo_flags |= TOMOYO_TASK_IS_EXECUTE_HANDLER; |
1766 |
/* Mark the current process as normal process. */ |
1767 |
else |
1768 |
task->tomoyo_flags &= ~TOMOYO_TASK_IS_EXECUTE_HANDLER; |
1769 |
out: |
1770 |
ccs_free_execve_entry(ee); |
1771 |
} |
1772 |
|
1773 |
#else |
1774 |
|
1775 |
/** |
1776 |
* ccs_start_execve - Prepare for execve() operation. |
1777 |
* |
1778 |
* @bprm: Pointer to "struct linux_binprm". |
1779 |
* |
1780 |
* Returns 0. |
1781 |
*/ |
1782 |
int ccs_start_execve(struct linux_binprm *bprm) |
1783 |
{ |
1784 |
#ifdef CONFIG_SAKURA |
1785 |
/* Clear manager flag. */ |
1786 |
current->tomoyo_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
1787 |
if (!ccs_policy_loaded) |
1788 |
ccs_load_policy(bprm->filename); |
1789 |
#endif |
1790 |
return 0; |
1791 |
} |
1792 |
|
1793 |
/** |
1794 |
* ccs_finish_execve - Clean up execve() operation. |
1795 |
*/ |
1796 |
void ccs_finish_execve(int retval) |
1797 |
{ |
1798 |
} |
1799 |
|
1800 |
#endif |