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: 1.6.8 2009/05/28 |
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 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) |
24 |
#include <linux/fs_struct.h> |
25 |
#endif |
26 |
|
27 |
/* For compatibility with older kernels. */ |
28 |
#ifndef for_each_process |
29 |
#define for_each_process for_each_task |
30 |
#endif |
31 |
|
32 |
/* Variables definitions.*/ |
33 |
|
34 |
/* The initial domain. */ |
35 |
struct ccs_domain_info ccs_kernel_domain; |
36 |
|
37 |
/* The list for "struct ccs_domain_info". */ |
38 |
LIST_HEAD(ccs_domain_list); |
39 |
|
40 |
#ifdef CONFIG_TOMOYO |
41 |
|
42 |
/** |
43 |
* ccs_get_last_name - Get last component of a domainname. |
44 |
* |
45 |
* @domain: Pointer to "struct ccs_domain_info". |
46 |
* |
47 |
* Returns the last component of the domainname. |
48 |
*/ |
49 |
const char *ccs_get_last_name(const struct ccs_domain_info *domain) |
50 |
{ |
51 |
const char *cp0 = domain->domainname->name; |
52 |
const char *cp1 = strrchr(cp0, ' '); |
53 |
if (cp1) |
54 |
return cp1 + 1; |
55 |
return cp0; |
56 |
} |
57 |
|
58 |
/** |
59 |
* ccs_add_domain_acl - Add the given ACL to the given domain. |
60 |
* |
61 |
* @domain: Pointer to "struct ccs_domain_info". May be NULL. |
62 |
* @acl: Pointer to "struct ccs_acl_info". |
63 |
* |
64 |
* Returns 0. |
65 |
*/ |
66 |
int ccs_add_domain_acl(struct ccs_domain_info *domain, struct ccs_acl_info *acl) |
67 |
{ |
68 |
if (domain) { |
69 |
if (acl->cond) |
70 |
atomic_inc(&acl->cond->users); |
71 |
list_add_tail_rcu(&acl->list, &domain->acl_info_list); |
72 |
} else { |
73 |
acl->type &= ~ACL_DELETED; |
74 |
} |
75 |
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
76 |
return 0; |
77 |
} |
78 |
|
79 |
/** |
80 |
* ccs_del_domain_acl - Delete the given ACL from the domain. |
81 |
* |
82 |
* @acl: Pointer to "struct ccs_acl_info". May be NULL. |
83 |
* |
84 |
* Returns 0. |
85 |
*/ |
86 |
int ccs_del_domain_acl(struct ccs_acl_info *acl) |
87 |
{ |
88 |
if (acl) |
89 |
acl->type |= ACL_DELETED; |
90 |
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
91 |
return 0; |
92 |
} |
93 |
|
94 |
/** |
95 |
* ccs_audit_execute_handler_log - Audit execute_handler log. |
96 |
* |
97 |
* @ee: Pointer to "struct ccs_execve_entry". |
98 |
* @is_default: True if it is "execute_handler" log. |
99 |
* |
100 |
* Returns 0 on success, negative value otherwise. |
101 |
*/ |
102 |
static int ccs_audit_execute_handler_log(struct ccs_execve_entry *ee, |
103 |
const bool is_default) |
104 |
{ |
105 |
struct ccs_request_info *r = &ee->r; |
106 |
const char *handler = ee->handler->name; |
107 |
r->mode = ccs_check_flags(r->domain, CCS_MAC_FOR_FILE); |
108 |
return ccs_write_audit_log(true, r, "%s %s\n", |
109 |
is_default ? KEYWORD_EXECUTE_HANDLER : |
110 |
KEYWORD_DENIED_EXECUTE_HANDLER, handler); |
111 |
} |
112 |
|
113 |
/** |
114 |
* ccs_audit_domain_creation_log - Audit domain creation log. |
115 |
* |
116 |
* @domain: Pointer to "struct ccs_domain_info". |
117 |
* |
118 |
* Returns 0 on success, negative value otherwise. |
119 |
*/ |
120 |
static int ccs_audit_domain_creation_log(struct ccs_domain_info *domain) |
121 |
{ |
122 |
int error; |
123 |
struct ccs_request_info r; |
124 |
ccs_init_request_info(&r, domain, CCS_MAC_FOR_FILE); |
125 |
error = ccs_write_audit_log(false, &r, "use_profile %u\n", r.profile); |
126 |
return error; |
127 |
} |
128 |
|
129 |
/* The list for "struct ccs_domain_initializer_entry". */ |
130 |
LIST_HEAD(ccs_domain_initializer_list); |
131 |
|
132 |
/** |
133 |
* ccs_update_domain_initializer_entry - Update "struct ccs_domain_initializer_entry" list. |
134 |
* |
135 |
* @domainname: The name of domain. May be NULL. |
136 |
* @program: The name of program. |
137 |
* @is_not: True if it is "no_initialize_domain" entry. |
138 |
* @is_delete: True if it is a delete request. |
139 |
* |
140 |
* Returns 0 on success, negative value otherwise. |
141 |
*/ |
142 |
static int ccs_update_domain_initializer_entry(const char *domainname, |
143 |
const char *program, |
144 |
const bool is_not, |
145 |
const bool is_delete) |
146 |
{ |
147 |
struct ccs_domain_initializer_entry *entry = NULL; |
148 |
struct ccs_domain_initializer_entry *ptr; |
149 |
const struct ccs_path_info *saved_program; |
150 |
const struct ccs_path_info *saved_domainname = NULL; |
151 |
int error = is_delete ? -ENOENT : -ENOMEM; |
152 |
bool is_last_name = false; |
153 |
if (!ccs_is_correct_path(program, 1, -1, -1)) |
154 |
return -EINVAL; /* No patterns allowed. */ |
155 |
if (domainname) { |
156 |
if (!ccs_is_domain_def(domainname) && |
157 |
ccs_is_correct_path(domainname, 1, -1, -1)) |
158 |
is_last_name = true; |
159 |
else if (!ccs_is_correct_domain(domainname)) |
160 |
return -EINVAL; |
161 |
saved_domainname = ccs_get_name(domainname); |
162 |
if (!saved_domainname) |
163 |
return -ENOMEM; |
164 |
} |
165 |
saved_program = ccs_get_name(program); |
166 |
if (!saved_program) { |
167 |
ccs_put_name(saved_domainname); |
168 |
return -ENOMEM; |
169 |
} |
170 |
if (!is_delete) |
171 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
172 |
mutex_lock(&ccs_policy_lock); |
173 |
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
174 |
if (ptr->is_not != is_not || |
175 |
ptr->domainname != saved_domainname || |
176 |
ptr->program != saved_program) |
177 |
continue; |
178 |
ptr->is_deleted = is_delete; |
179 |
error = 0; |
180 |
break; |
181 |
} |
182 |
if (!is_delete && error && ccs_memory_ok(entry)) { |
183 |
entry->domainname = saved_domainname; |
184 |
saved_domainname = NULL; |
185 |
entry->program = saved_program; |
186 |
saved_program = NULL; |
187 |
entry->is_not = is_not; |
188 |
entry->is_last_name = is_last_name; |
189 |
list_add_tail_rcu(&entry->list, &ccs_domain_initializer_list); |
190 |
entry = NULL; |
191 |
error = 0; |
192 |
} |
193 |
mutex_unlock(&ccs_policy_lock); |
194 |
ccs_put_name(saved_domainname); |
195 |
ccs_put_name(saved_program); |
196 |
kfree(entry); |
197 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
198 |
return error; |
199 |
} |
200 |
|
201 |
/** |
202 |
* ccs_read_domain_initializer_policy - Read "struct ccs_domain_initializer_entry" list. |
203 |
* |
204 |
* @head: Pointer to "struct ccs_io_buffer". |
205 |
* |
206 |
* Returns true on success, false otherwise. |
207 |
* |
208 |
* Caller holds srcu_read_lock(&ccs_ss). |
209 |
*/ |
210 |
bool ccs_read_domain_initializer_policy(struct ccs_io_buffer *head) |
211 |
{ |
212 |
struct list_head *pos; |
213 |
bool done = true; |
214 |
list_for_each_cookie(pos, head->read_var2, |
215 |
&ccs_domain_initializer_list) { |
216 |
const char *no; |
217 |
const char *from = ""; |
218 |
const char *domain = ""; |
219 |
struct ccs_domain_initializer_entry *ptr; |
220 |
ptr = list_entry(pos, struct ccs_domain_initializer_entry, |
221 |
list); |
222 |
if (ptr->is_deleted) |
223 |
continue; |
224 |
no = ptr->is_not ? "no_" : ""; |
225 |
if (ptr->domainname) { |
226 |
from = " from "; |
227 |
domain = ptr->domainname->name; |
228 |
} |
229 |
done = ccs_io_printf(head, |
230 |
"%s" KEYWORD_INITIALIZE_DOMAIN "%s%s%s\n", |
231 |
no, ptr->program->name, from, domain); |
232 |
if (!done) |
233 |
break; |
234 |
} |
235 |
return done; |
236 |
} |
237 |
|
238 |
/** |
239 |
* ccs_write_domain_initializer_policy - Write "struct ccs_domain_initializer_entry" list. |
240 |
* |
241 |
* @data: String to parse. |
242 |
* @is_not: True if it is "no_initialize_domain" entry. |
243 |
* @is_delete: True if it is a delete request. |
244 |
* |
245 |
* Returns 0 on success, negative value otherwise. |
246 |
*/ |
247 |
int ccs_write_domain_initializer_policy(char *data, const bool is_not, |
248 |
const bool is_delete) |
249 |
{ |
250 |
char *cp = strstr(data, " from "); |
251 |
if (cp) { |
252 |
*cp = '\0'; |
253 |
return ccs_update_domain_initializer_entry(cp + 6, data, |
254 |
is_not, is_delete); |
255 |
} |
256 |
return ccs_update_domain_initializer_entry(NULL, data, is_not, |
257 |
is_delete); |
258 |
} |
259 |
|
260 |
/** |
261 |
* ccs_is_domain_initializer - Check whether the given program causes domainname reinitialization. |
262 |
* |
263 |
* @domainname: The name of domain. |
264 |
* @program: The name of program. |
265 |
* @last_name: The last component of @domainname. |
266 |
* |
267 |
* Returns true if executing @program reinitializes domain transition, |
268 |
* false otherwise. |
269 |
* |
270 |
* Caller holds srcu_read_lock(&ccs_ss). |
271 |
*/ |
272 |
static bool ccs_is_domain_initializer(const struct ccs_path_info *domainname, |
273 |
const struct ccs_path_info *program, |
274 |
const struct ccs_path_info *last_name) |
275 |
{ |
276 |
struct ccs_domain_initializer_entry *ptr; |
277 |
bool flag = false; |
278 |
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
279 |
if (ptr->is_deleted) |
280 |
continue; |
281 |
if (ptr->domainname) { |
282 |
if (!ptr->is_last_name) { |
283 |
if (ptr->domainname != domainname) |
284 |
continue; |
285 |
} else { |
286 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
287 |
continue; |
288 |
} |
289 |
} |
290 |
if (ccs_pathcmp(ptr->program, program)) |
291 |
continue; |
292 |
if (ptr->is_not) { |
293 |
flag = false; |
294 |
break; |
295 |
} |
296 |
flag = true; |
297 |
} |
298 |
return flag; |
299 |
} |
300 |
|
301 |
/* The list for "struct ccs_domain_keeper_entry". */ |
302 |
LIST_HEAD(ccs_domain_keeper_list); |
303 |
|
304 |
/** |
305 |
* ccs_update_domain_keeper_entry - Update "struct ccs_domain_keeper_entry" list. |
306 |
* |
307 |
* @domainname: The name of domain. |
308 |
* @program: The name of program. May be NULL. |
309 |
* @is_not: True if it is "no_keep_domain" entry. |
310 |
* @is_delete: True if it is a delete request. |
311 |
* |
312 |
* Returns 0 on success, negative value otherwise. |
313 |
*/ |
314 |
static int ccs_update_domain_keeper_entry(const char *domainname, |
315 |
const char *program, |
316 |
const bool is_not, |
317 |
const bool is_delete) |
318 |
{ |
319 |
struct ccs_domain_keeper_entry *entry = NULL; |
320 |
struct ccs_domain_keeper_entry *ptr; |
321 |
const struct ccs_path_info *saved_domainname; |
322 |
const struct ccs_path_info *saved_program = NULL; |
323 |
int error = is_delete ? -ENOENT : -ENOMEM; |
324 |
bool is_last_name = false; |
325 |
if (!ccs_is_domain_def(domainname) && |
326 |
ccs_is_correct_path(domainname, 1, -1, -1)) |
327 |
is_last_name = true; |
328 |
else if (!ccs_is_correct_domain(domainname)) |
329 |
return -EINVAL; |
330 |
if (program) { |
331 |
if (!ccs_is_correct_path(program, 1, -1, -1)) |
332 |
return -EINVAL; |
333 |
saved_program = ccs_get_name(program); |
334 |
if (!saved_program) |
335 |
return -ENOMEM; |
336 |
} |
337 |
saved_domainname = ccs_get_name(domainname); |
338 |
if (!saved_domainname) { |
339 |
ccs_put_name(saved_program); |
340 |
return -ENOMEM; |
341 |
} |
342 |
if (!is_delete) |
343 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
344 |
mutex_lock(&ccs_policy_lock); |
345 |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
346 |
if (ptr->is_not != is_not || |
347 |
ptr->domainname != saved_domainname || |
348 |
ptr->program != saved_program) |
349 |
continue; |
350 |
ptr->is_deleted = is_delete; |
351 |
error = 0; |
352 |
break; |
353 |
} |
354 |
if (!is_delete && error && ccs_memory_ok(entry)) { |
355 |
entry->domainname = saved_domainname; |
356 |
saved_domainname = NULL; |
357 |
entry->program = saved_program; |
358 |
saved_program = NULL; |
359 |
entry->is_not = is_not; |
360 |
entry->is_last_name = is_last_name; |
361 |
list_add_tail_rcu(&entry->list, &ccs_domain_keeper_list); |
362 |
entry = NULL; |
363 |
error = 0; |
364 |
} |
365 |
mutex_unlock(&ccs_policy_lock); |
366 |
ccs_put_name(saved_domainname); |
367 |
ccs_put_name(saved_program); |
368 |
kfree(entry); |
369 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
370 |
return error; |
371 |
} |
372 |
|
373 |
/** |
374 |
* ccs_write_domain_keeper_policy - Write "struct ccs_domain_keeper_entry" list. |
375 |
* |
376 |
* @data: String to parse. |
377 |
* @is_not: True if it is "no_keep_domain" entry. |
378 |
* @is_delete: True if it is a delete request. |
379 |
* |
380 |
*/ |
381 |
int ccs_write_domain_keeper_policy(char *data, const bool is_not, |
382 |
const bool is_delete) |
383 |
{ |
384 |
char *cp = strstr(data, " from "); |
385 |
if (cp) { |
386 |
*cp = '\0'; |
387 |
return ccs_update_domain_keeper_entry(cp + 6, data, |
388 |
is_not, is_delete); |
389 |
} |
390 |
return ccs_update_domain_keeper_entry(data, NULL, is_not, is_delete); |
391 |
} |
392 |
|
393 |
/** |
394 |
* ccs_read_domain_keeper_policy - Read "struct ccs_domain_keeper_entry" list. |
395 |
* |
396 |
* @head: Pointer to "struct ccs_io_buffer". |
397 |
* |
398 |
* Returns true on success, false otherwise. |
399 |
* |
400 |
* Caller holds srcu_read_lock(&ccs_ss). |
401 |
*/ |
402 |
bool ccs_read_domain_keeper_policy(struct ccs_io_buffer *head) |
403 |
{ |
404 |
struct list_head *pos; |
405 |
bool done = true; |
406 |
list_for_each_cookie(pos, head->read_var2, |
407 |
&ccs_domain_keeper_list) { |
408 |
struct ccs_domain_keeper_entry *ptr; |
409 |
const char *no; |
410 |
const char *from = ""; |
411 |
const char *program = ""; |
412 |
ptr = list_entry(pos, struct ccs_domain_keeper_entry, list); |
413 |
if (ptr->is_deleted) |
414 |
continue; |
415 |
no = ptr->is_not ? "no_" : ""; |
416 |
if (ptr->program) { |
417 |
from = " from "; |
418 |
program = ptr->program->name; |
419 |
} |
420 |
done = ccs_io_printf(head, |
421 |
"%s" KEYWORD_KEEP_DOMAIN "%s%s%s\n", no, |
422 |
program, from, ptr->domainname->name); |
423 |
if (!done) |
424 |
break; |
425 |
} |
426 |
return done; |
427 |
} |
428 |
|
429 |
/** |
430 |
* ccs_is_domain_keeper - Check whether the given program causes domain transition suppression. |
431 |
* |
432 |
* @domainname: The name of domain. |
433 |
* @program: The name of program. |
434 |
* @last_name: The last component of @domainname. |
435 |
* |
436 |
* Returns true if executing @program supresses domain transition, |
437 |
* false otherwise. |
438 |
* |
439 |
* Caller holds srcu_read_lock(&ccs_ss). |
440 |
*/ |
441 |
static bool ccs_is_domain_keeper(const struct ccs_path_info *domainname, |
442 |
const struct ccs_path_info *program, |
443 |
const struct ccs_path_info *last_name) |
444 |
{ |
445 |
struct ccs_domain_keeper_entry *ptr; |
446 |
bool flag = false; |
447 |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
448 |
if (ptr->is_deleted) |
449 |
continue; |
450 |
if (!ptr->is_last_name) { |
451 |
if (ptr->domainname != domainname) |
452 |
continue; |
453 |
} else { |
454 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
455 |
continue; |
456 |
} |
457 |
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
458 |
continue; |
459 |
if (ptr->is_not) { |
460 |
flag = false; |
461 |
break; |
462 |
} |
463 |
flag = true; |
464 |
} |
465 |
return flag; |
466 |
} |
467 |
|
468 |
/* The list for "struct ccs_alias_entry". */ |
469 |
LIST_HEAD(ccs_alias_list); |
470 |
|
471 |
/** |
472 |
* ccs_update_alias_entry - Update "struct ccs_alias_entry" list. |
473 |
* |
474 |
* @original_name: The original program's real name. |
475 |
* @aliased_name: The symbolic program's symbolic link's name. |
476 |
* @is_delete: True if it is a delete request. |
477 |
* |
478 |
* Returns 0 on success, negative value otherwise. |
479 |
*/ |
480 |
static int ccs_update_alias_entry(const char *original_name, |
481 |
const char *aliased_name, |
482 |
const bool is_delete) |
483 |
{ |
484 |
struct ccs_alias_entry *entry = NULL; |
485 |
struct ccs_alias_entry *ptr; |
486 |
const struct ccs_path_info *saved_original_name; |
487 |
const struct ccs_path_info *saved_aliased_name; |
488 |
int error = is_delete ? -ENOENT : -ENOMEM; |
489 |
if (!ccs_is_correct_path(original_name, 1, -1, -1) || |
490 |
!ccs_is_correct_path(aliased_name, 1, -1, -1)) |
491 |
return -EINVAL; /* No patterns allowed. */ |
492 |
saved_original_name = ccs_get_name(original_name); |
493 |
saved_aliased_name = ccs_get_name(aliased_name); |
494 |
if (!saved_original_name || !saved_aliased_name) { |
495 |
ccs_put_name(saved_original_name); |
496 |
ccs_put_name(saved_aliased_name); |
497 |
return -ENOMEM; |
498 |
} |
499 |
if (!is_delete) |
500 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
501 |
mutex_lock(&ccs_policy_lock); |
502 |
list_for_each_entry_rcu(ptr, &ccs_alias_list, list) { |
503 |
if (ptr->original_name != saved_original_name || |
504 |
ptr->aliased_name != saved_aliased_name) |
505 |
continue; |
506 |
ptr->is_deleted = is_delete; |
507 |
error = 0; |
508 |
break; |
509 |
} |
510 |
if (!is_delete && error && ccs_memory_ok(entry)) { |
511 |
entry->original_name = saved_original_name; |
512 |
saved_original_name = NULL; |
513 |
entry->aliased_name = saved_aliased_name; |
514 |
saved_aliased_name = NULL; |
515 |
list_add_tail_rcu(&entry->list, &ccs_alias_list); |
516 |
entry = NULL; |
517 |
error = 0; |
518 |
} |
519 |
mutex_unlock(&ccs_policy_lock); |
520 |
ccs_put_name(saved_original_name); |
521 |
ccs_put_name(saved_aliased_name); |
522 |
kfree(entry); |
523 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
524 |
return error; |
525 |
} |
526 |
|
527 |
/** |
528 |
* ccs_read_alias_policy - Read "struct ccs_alias_entry" list. |
529 |
* |
530 |
* @head: Pointer to "struct ccs_io_buffer". |
531 |
* |
532 |
* Returns true on success, false otherwise. |
533 |
* |
534 |
* Caller holds srcu_read_lock(&ccs_ss). |
535 |
*/ |
536 |
bool ccs_read_alias_policy(struct ccs_io_buffer *head) |
537 |
{ |
538 |
struct list_head *pos; |
539 |
bool done = true; |
540 |
list_for_each_cookie(pos, head->read_var2, &ccs_alias_list) { |
541 |
struct ccs_alias_entry *ptr; |
542 |
ptr = list_entry(pos, struct ccs_alias_entry, list); |
543 |
if (ptr->is_deleted) |
544 |
continue; |
545 |
done = ccs_io_printf(head, KEYWORD_ALIAS "%s %s\n", |
546 |
ptr->original_name->name, |
547 |
ptr->aliased_name->name); |
548 |
if (!done) |
549 |
break; |
550 |
} |
551 |
return done; |
552 |
} |
553 |
|
554 |
/** |
555 |
* ccs_write_alias_policy - Write "struct ccs_alias_entry" list. |
556 |
* |
557 |
* @data: String to parse. |
558 |
* @is_delete: True if it is a delete request. |
559 |
* |
560 |
* Returns 0 on success, negative value otherwise. |
561 |
*/ |
562 |
int ccs_write_alias_policy(char *data, const bool is_delete) |
563 |
{ |
564 |
char *cp = strchr(data, ' '); |
565 |
if (!cp) |
566 |
return -EINVAL; |
567 |
*cp++ = '\0'; |
568 |
return ccs_update_alias_entry(data, cp, is_delete); |
569 |
} |
570 |
|
571 |
/* The list for "struct ccs_aggregator_entry". */ |
572 |
LIST_HEAD(ccs_aggregator_list); |
573 |
|
574 |
/** |
575 |
* ccs_update_aggregator_entry - Update "struct ccs_aggregator_entry" list. |
576 |
* |
577 |
* @original_name: The original program's name. |
578 |
* @aggregated_name: The aggregated program's name. |
579 |
* @is_delete: True if it is a delete request. |
580 |
* |
581 |
* Returns 0 on success, negative value otherwise. |
582 |
*/ |
583 |
static int ccs_update_aggregator_entry(const char *original_name, |
584 |
const char *aggregated_name, |
585 |
const bool is_delete) |
586 |
{ |
587 |
struct ccs_aggregator_entry *entry = NULL; |
588 |
struct ccs_aggregator_entry *ptr; |
589 |
const struct ccs_path_info *saved_original_name; |
590 |
const struct ccs_path_info *saved_aggregated_name; |
591 |
int error = is_delete ? -ENOENT : -ENOMEM; |
592 |
if (!ccs_is_correct_path(original_name, 1, 0, -1) || |
593 |
!ccs_is_correct_path(aggregated_name, 1, -1, -1)) |
594 |
return -EINVAL; |
595 |
saved_original_name = ccs_get_name(original_name); |
596 |
saved_aggregated_name = ccs_get_name(aggregated_name); |
597 |
if (!saved_original_name || !saved_aggregated_name) { |
598 |
ccs_put_name(saved_original_name); |
599 |
ccs_put_name(saved_aggregated_name); |
600 |
return -ENOMEM; |
601 |
} |
602 |
if (!is_delete) |
603 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
604 |
mutex_lock(&ccs_policy_lock); |
605 |
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
606 |
if (ptr->original_name != saved_original_name || |
607 |
ptr->aggregated_name != saved_aggregated_name) |
608 |
continue; |
609 |
ptr->is_deleted = is_delete; |
610 |
error = 0; |
611 |
break; |
612 |
} |
613 |
if (!is_delete && error && ccs_memory_ok(entry)) { |
614 |
entry->original_name = saved_original_name; |
615 |
saved_original_name = NULL; |
616 |
entry->aggregated_name = saved_aggregated_name; |
617 |
saved_aggregated_name = NULL; |
618 |
list_add_tail_rcu(&entry->list, &ccs_aggregator_list); |
619 |
entry = NULL; |
620 |
error = 0; |
621 |
} |
622 |
mutex_unlock(&ccs_policy_lock); |
623 |
ccs_put_name(saved_original_name); |
624 |
ccs_put_name(saved_aggregated_name); |
625 |
kfree(entry); |
626 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
627 |
return error; |
628 |
} |
629 |
|
630 |
/** |
631 |
* ccs_read_aggregator_policy - Read "struct ccs_aggregator_entry" list. |
632 |
* |
633 |
* @head: Pointer to "struct ccs_io_buffer". |
634 |
* |
635 |
* Returns true on success, false otherwise. |
636 |
* |
637 |
* Caller holds srcu_read_lock(&ccs_ss). |
638 |
*/ |
639 |
bool ccs_read_aggregator_policy(struct ccs_io_buffer *head) |
640 |
{ |
641 |
struct list_head *pos; |
642 |
bool done = true; |
643 |
list_for_each_cookie(pos, head->read_var2, &ccs_aggregator_list) { |
644 |
struct ccs_aggregator_entry *ptr; |
645 |
ptr = list_entry(pos, struct ccs_aggregator_entry, list); |
646 |
if (ptr->is_deleted) |
647 |
continue; |
648 |
done = ccs_io_printf(head, KEYWORD_AGGREGATOR "%s %s\n", |
649 |
ptr->original_name->name, |
650 |
ptr->aggregated_name->name); |
651 |
if (!done) |
652 |
break; |
653 |
} |
654 |
return done; |
655 |
} |
656 |
|
657 |
/** |
658 |
* ccs_write_aggregator_policy - Write "struct ccs_aggregator_entry" list. |
659 |
* |
660 |
* @data: String to parse. |
661 |
* @is_delete: True if it is a delete request. |
662 |
* |
663 |
* Returns 0 on success, negative value otherwise. |
664 |
*/ |
665 |
int ccs_write_aggregator_policy(char *data, const bool is_delete) |
666 |
{ |
667 |
char *cp = strchr(data, ' '); |
668 |
if (!cp) |
669 |
return -EINVAL; |
670 |
*cp++ = '\0'; |
671 |
return ccs_update_aggregator_entry(data, cp, is_delete); |
672 |
} |
673 |
|
674 |
/* Domain create/delete handler. */ |
675 |
|
676 |
/** |
677 |
* ccs_delete_domain - Delete a domain. |
678 |
* |
679 |
* @domainname: The name of domain. |
680 |
* |
681 |
* Returns 0. |
682 |
*/ |
683 |
int ccs_delete_domain(char *domainname) |
684 |
{ |
685 |
struct ccs_domain_info *domain; |
686 |
struct ccs_path_info name; |
687 |
name.name = domainname; |
688 |
ccs_fill_path_info(&name); |
689 |
mutex_lock(&ccs_policy_lock); |
690 |
/* Is there an active domain? */ |
691 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
692 |
/* Never delete ccs_kernel_domain */ |
693 |
if (domain == &ccs_kernel_domain) |
694 |
continue; |
695 |
if (domain->is_deleted || |
696 |
ccs_pathcmp(domain->domainname, &name)) |
697 |
continue; |
698 |
domain->is_deleted = true; |
699 |
break; |
700 |
} |
701 |
mutex_unlock(&ccs_policy_lock); |
702 |
return 0; |
703 |
} |
704 |
|
705 |
/** |
706 |
* ccs_find_or_assign_new_domain - Create a domain. |
707 |
* |
708 |
* @domainname: The name of domain. |
709 |
* @profile: Profile number to assign if the domain was newly created. |
710 |
* |
711 |
* Returns pointer to "struct ccs_domain_info" on success, NULL otherwise. |
712 |
*/ |
713 |
struct ccs_domain_info *ccs_find_or_assign_new_domain(const char *domainname, |
714 |
const u8 profile) |
715 |
{ |
716 |
struct ccs_domain_info *entry; |
717 |
struct ccs_domain_info *domain; |
718 |
const struct ccs_path_info *saved_domainname; |
719 |
bool found = false; |
720 |
|
721 |
if (!ccs_is_correct_domain(domainname)) |
722 |
return NULL; |
723 |
saved_domainname = ccs_get_name(domainname); |
724 |
if (!saved_domainname) |
725 |
return NULL; |
726 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
727 |
mutex_lock(&ccs_policy_lock); |
728 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
729 |
if (domain->is_deleted || |
730 |
ccs_pathcmp(saved_domainname, domain->domainname)) |
731 |
continue; |
732 |
found = true; |
733 |
break; |
734 |
} |
735 |
if (!found && ccs_memory_ok(entry)) { |
736 |
INIT_LIST_HEAD(&entry->acl_info_list); |
737 |
entry->domainname = saved_domainname; |
738 |
saved_domainname = NULL; |
739 |
entry->profile = profile; |
740 |
list_add_tail_rcu(&entry->list, &ccs_domain_list); |
741 |
domain = entry; |
742 |
entry = NULL; |
743 |
found = true; |
744 |
} |
745 |
mutex_unlock(&ccs_policy_lock); |
746 |
ccs_put_name(saved_domainname); |
747 |
kfree(entry); |
748 |
return found ? domain : NULL; |
749 |
} |
750 |
|
751 |
/** |
752 |
* ccs_get_argv0 - Get argv[0]. |
753 |
* |
754 |
* @ee: Pointer to "struct ccs_execve_entry". |
755 |
* |
756 |
* Returns true on success, false otherwise. |
757 |
*/ |
758 |
static bool ccs_get_argv0(struct ccs_execve_entry *ee) |
759 |
{ |
760 |
struct linux_binprm *bprm = ee->bprm; |
761 |
char *arg_ptr = ee->tmp; |
762 |
int arg_len = 0; |
763 |
unsigned long pos = bprm->p; |
764 |
int offset = pos % PAGE_SIZE; |
765 |
bool done = false; |
766 |
if (!bprm->argc) |
767 |
goto out; |
768 |
while (1) { |
769 |
if (!ccs_dump_page(bprm, pos, &ee->dump)) |
770 |
goto out; |
771 |
pos += PAGE_SIZE - offset; |
772 |
/* Read. */ |
773 |
while (offset < PAGE_SIZE) { |
774 |
const char *kaddr = ee->dump.data; |
775 |
const unsigned char c = kaddr[offset++]; |
776 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
777 |
if (c == '\\') { |
778 |
arg_ptr[arg_len++] = '\\'; |
779 |
arg_ptr[arg_len++] = '\\'; |
780 |
} else if (c == '/') { |
781 |
arg_len = 0; |
782 |
} else if (c > ' ' && c < 127) { |
783 |
arg_ptr[arg_len++] = c; |
784 |
} else { |
785 |
arg_ptr[arg_len++] = '\\'; |
786 |
arg_ptr[arg_len++] = (c >> 6) + '0'; |
787 |
arg_ptr[arg_len++] |
788 |
= ((c >> 3) & 7) + '0'; |
789 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
790 |
} |
791 |
} else { |
792 |
arg_ptr[arg_len] = '\0'; |
793 |
done = true; |
794 |
break; |
795 |
} |
796 |
} |
797 |
offset = 0; |
798 |
if (done) |
799 |
break; |
800 |
} |
801 |
return true; |
802 |
out: |
803 |
return false; |
804 |
} |
805 |
|
806 |
/** |
807 |
* ccs_find_next_domain - Find a domain. |
808 |
* |
809 |
* @ee: Pointer to "struct ccs_execve_entry". |
810 |
* |
811 |
* Returns 0 on success, negative value otherwise. |
812 |
* |
813 |
* Caller holds srcu_read_lock(&ccs_ss). |
814 |
*/ |
815 |
static int ccs_find_next_domain(struct ccs_execve_entry *ee) |
816 |
{ |
817 |
struct ccs_request_info *r = &ee->r; |
818 |
const struct ccs_path_info *handler = ee->handler; |
819 |
struct ccs_domain_info *domain = NULL; |
820 |
const char *old_domain_name = r->domain->domainname->name; |
821 |
struct linux_binprm *bprm = ee->bprm; |
822 |
const u8 mode = r->mode; |
823 |
const bool is_enforce = (mode == 3); |
824 |
const u32 ccs_flags = current->ccs_flags; |
825 |
char *new_domain_name = NULL; |
826 |
struct ccs_path_info rn; /* real name */ |
827 |
struct ccs_path_info sn; /* symlink name */ |
828 |
struct ccs_path_info ln; /* last name */ |
829 |
int retval; |
830 |
retry: |
831 |
current->ccs_flags = ccs_flags; |
832 |
r->cond = NULL; |
833 |
/* Get realpath of program and symbolic link. */ |
834 |
retval = ccs_realpath_both(bprm->filename, ee); |
835 |
if (retval < 0) |
836 |
goto out; |
837 |
|
838 |
rn.name = ee->program_path; |
839 |
ccs_fill_path_info(&rn); |
840 |
sn.name = ee->tmp; |
841 |
ccs_fill_path_info(&sn); |
842 |
ln.name = ccs_get_last_name(r->domain); |
843 |
ccs_fill_path_info(&ln); |
844 |
|
845 |
if (handler) { |
846 |
if (ccs_pathcmp(&rn, handler)) { |
847 |
/* Failed to verify execute handler. */ |
848 |
static u8 counter = 20; |
849 |
if (counter) { |
850 |
counter--; |
851 |
printk(KERN_WARNING "Failed to verify: %s\n", |
852 |
handler->name); |
853 |
} |
854 |
goto out; |
855 |
} |
856 |
goto calculate_domain; |
857 |
} |
858 |
|
859 |
/* Check 'alias' directive. */ |
860 |
if (ccs_pathcmp(&rn, &sn)) { |
861 |
struct ccs_alias_entry *ptr; |
862 |
/* Is this program allowed to be called via symbolic links? */ |
863 |
list_for_each_entry_rcu(ptr, &ccs_alias_list, list) { |
864 |
if (ptr->is_deleted || |
865 |
ccs_pathcmp(&rn, ptr->original_name) || |
866 |
ccs_pathcmp(&sn, ptr->aliased_name)) |
867 |
continue; |
868 |
strncpy(ee->program_path, ptr->aliased_name->name, |
869 |
CCS_MAX_PATHNAME_LEN - 1); |
870 |
ccs_fill_path_info(&rn); |
871 |
break; |
872 |
} |
873 |
} |
874 |
/* sn will be overwritten after here. */ |
875 |
|
876 |
/* Compare basename of program_path and argv[0] */ |
877 |
r->mode = ccs_check_flags(r->domain, CCS_MAC_FOR_ARGV0); |
878 |
if (bprm->argc > 0 && r->mode) { |
879 |
char *base_argv0 = ee->tmp; |
880 |
const char *base_filename; |
881 |
retval = -ENOMEM; |
882 |
if (!ccs_get_argv0(ee)) |
883 |
goto out; |
884 |
base_filename = strrchr(ee->program_path, '/'); |
885 |
if (!base_filename) |
886 |
base_filename = ee->program_path; |
887 |
else |
888 |
base_filename++; |
889 |
if (strcmp(base_argv0, base_filename)) { |
890 |
retval = ccs_check_argv0_perm(r, &rn, base_argv0); |
891 |
if (retval == 1) |
892 |
goto retry; |
893 |
if (retval < 0) |
894 |
goto out; |
895 |
} |
896 |
} |
897 |
|
898 |
/* Check 'aggregator' directive. */ |
899 |
{ |
900 |
struct ccs_aggregator_entry *ptr; |
901 |
/* Is this program allowed to be aggregated? */ |
902 |
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
903 |
if (ptr->is_deleted || |
904 |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
905 |
continue; |
906 |
strncpy(ee->program_path, ptr->aggregated_name->name, |
907 |
CCS_MAX_PATHNAME_LEN - 1); |
908 |
ccs_fill_path_info(&rn); |
909 |
break; |
910 |
} |
911 |
} |
912 |
|
913 |
/* Check execute permission. */ |
914 |
r->mode = mode; |
915 |
retval = ccs_check_exec_perm(r, &rn); |
916 |
if (retval == 1) |
917 |
goto retry; |
918 |
if (retval < 0) |
919 |
goto out; |
920 |
|
921 |
calculate_domain: |
922 |
new_domain_name = ee->tmp; |
923 |
if (ccs_is_domain_initializer(r->domain->domainname, &rn, &ln)) { |
924 |
/* Transit to the child of ccs_kernel_domain domain. */ |
925 |
snprintf(new_domain_name, CCS_EXEC_TMPSIZE - 1, |
926 |
ROOT_NAME " " "%s", ee->program_path); |
927 |
} else if (r->domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
928 |
/* |
929 |
* Needn't to transit from kernel domain before starting |
930 |
* /sbin/init. But transit from kernel domain if executing |
931 |
* initializers because they might start before /sbin/init. |
932 |
*/ |
933 |
domain = r->domain; |
934 |
} else if (ccs_is_domain_keeper(r->domain->domainname, &rn, &ln)) { |
935 |
/* Keep current domain. */ |
936 |
domain = r->domain; |
937 |
} else { |
938 |
/* Normal domain transition. */ |
939 |
snprintf(new_domain_name, CCS_EXEC_TMPSIZE - 1, |
940 |
"%s %s", old_domain_name, ee->program_path); |
941 |
} |
942 |
if (domain || strlen(new_domain_name) >= CCS_MAX_PATHNAME_LEN) |
943 |
goto done; |
944 |
domain = ccs_find_domain(new_domain_name); |
945 |
if (domain) |
946 |
goto done; |
947 |
if (is_enforce) { |
948 |
int error = ccs_check_supervisor(r, |
949 |
"# wants to create domain\n" |
950 |
"%s\n", new_domain_name); |
951 |
if (error == 1) |
952 |
goto retry; |
953 |
if (error < 0) |
954 |
goto done; |
955 |
} |
956 |
domain = ccs_find_or_assign_new_domain(new_domain_name, r->profile); |
957 |
if (domain) |
958 |
ccs_audit_domain_creation_log(r->domain); |
959 |
done: |
960 |
if (!domain) { |
961 |
printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", |
962 |
new_domain_name); |
963 |
if (is_enforce) |
964 |
retval = -EPERM; |
965 |
else { |
966 |
retval = 0; |
967 |
r->domain->domain_transition_failed = true; |
968 |
} |
969 |
} else { |
970 |
retval = 0; |
971 |
} |
972 |
out: |
973 |
if (domain) |
974 |
r->domain = domain; |
975 |
return retval; |
976 |
} |
977 |
|
978 |
/** |
979 |
* ccs_check_environ - Check permission for environment variable names. |
980 |
* |
981 |
* @ee: Pointer to "struct ccs_execve_entry". |
982 |
* |
983 |
* Returns 0 on success, negative value otherwise. |
984 |
*/ |
985 |
static int ccs_check_environ(struct ccs_execve_entry *ee) |
986 |
{ |
987 |
struct ccs_request_info *r = &ee->r; |
988 |
struct linux_binprm *bprm = ee->bprm; |
989 |
char *arg_ptr = ee->tmp; |
990 |
int arg_len = 0; |
991 |
unsigned long pos = bprm->p; |
992 |
int offset = pos % PAGE_SIZE; |
993 |
int argv_count = bprm->argc; |
994 |
int envp_count = bprm->envc; |
995 |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
996 |
int error = -ENOMEM; |
997 |
if (!r->mode || !envp_count) |
998 |
return 0; |
999 |
while (error == -ENOMEM) { |
1000 |
if (!ccs_dump_page(bprm, pos, &ee->dump)) |
1001 |
goto out; |
1002 |
pos += PAGE_SIZE - offset; |
1003 |
/* Read. */ |
1004 |
while (argv_count && offset < PAGE_SIZE) { |
1005 |
const char *kaddr = ee->dump.data; |
1006 |
if (!kaddr[offset++]) |
1007 |
argv_count--; |
1008 |
} |
1009 |
if (argv_count) { |
1010 |
offset = 0; |
1011 |
continue; |
1012 |
} |
1013 |
while (offset < PAGE_SIZE) { |
1014 |
const char *kaddr = ee->dump.data; |
1015 |
const unsigned char c = kaddr[offset++]; |
1016 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
1017 |
if (c == '=') { |
1018 |
arg_ptr[arg_len++] = '\0'; |
1019 |
} else if (c == '\\') { |
1020 |
arg_ptr[arg_len++] = '\\'; |
1021 |
arg_ptr[arg_len++] = '\\'; |
1022 |
} else if (c > ' ' && c < 127) { |
1023 |
arg_ptr[arg_len++] = c; |
1024 |
} else { |
1025 |
arg_ptr[arg_len++] = '\\'; |
1026 |
arg_ptr[arg_len++] = (c >> 6) + '0'; |
1027 |
arg_ptr[arg_len++] |
1028 |
= ((c >> 3) & 7) + '0'; |
1029 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
1030 |
} |
1031 |
} else { |
1032 |
arg_ptr[arg_len] = '\0'; |
1033 |
} |
1034 |
if (c) |
1035 |
continue; |
1036 |
if (ccs_check_env_perm(r, arg_ptr)) { |
1037 |
error = -EPERM; |
1038 |
break; |
1039 |
} |
1040 |
if (!--envp_count) { |
1041 |
error = 0; |
1042 |
break; |
1043 |
} |
1044 |
arg_len = 0; |
1045 |
} |
1046 |
offset = 0; |
1047 |
} |
1048 |
out: |
1049 |
if (r->mode != 3) |
1050 |
error = 0; |
1051 |
return error; |
1052 |
} |
1053 |
|
1054 |
/** |
1055 |
* ccs_unescape - Unescape escaped string. |
1056 |
* |
1057 |
* @dest: String to unescape. |
1058 |
* |
1059 |
* Returns nothing. |
1060 |
*/ |
1061 |
static void ccs_unescape(unsigned char *dest) |
1062 |
{ |
1063 |
unsigned char *src = dest; |
1064 |
unsigned char c; |
1065 |
unsigned char d; |
1066 |
unsigned char e; |
1067 |
while (1) { |
1068 |
c = *src++; |
1069 |
if (!c) |
1070 |
break; |
1071 |
if (c != '\\') { |
1072 |
*dest++ = c; |
1073 |
continue; |
1074 |
} |
1075 |
c = *src++; |
1076 |
if (c == '\\') { |
1077 |
*dest++ = c; |
1078 |
continue; |
1079 |
} |
1080 |
if (c < '0' || c > '3') |
1081 |
break; |
1082 |
d = *src++; |
1083 |
if (d < '0' || d > '7') |
1084 |
break; |
1085 |
e = *src++; |
1086 |
if (e < '0' || e > '7') |
1087 |
break; |
1088 |
*dest++ = ((c - '0') << 6) + ((d - '0') << 3) + (e - '0'); |
1089 |
} |
1090 |
*dest = '\0'; |
1091 |
} |
1092 |
|
1093 |
/** |
1094 |
* ccs_root_depth - Get number of directories to strip. |
1095 |
* |
1096 |
* @dentry: Pointer to "struct dentry". |
1097 |
* @vfsmnt: Pointer to "struct vfsmount". |
1098 |
* |
1099 |
* Returns number of directories to strip. |
1100 |
*/ |
1101 |
static inline int ccs_root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
1102 |
{ |
1103 |
int depth = 0; |
1104 |
/***** CRITICAL SECTION START *****/ |
1105 |
ccs_realpath_lock(); |
1106 |
for (;;) { |
1107 |
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
1108 |
/* Global root? */ |
1109 |
if (vfsmnt->mnt_parent == vfsmnt) |
1110 |
break; |
1111 |
dentry = vfsmnt->mnt_mountpoint; |
1112 |
vfsmnt = vfsmnt->mnt_parent; |
1113 |
continue; |
1114 |
} |
1115 |
dentry = dentry->d_parent; |
1116 |
depth++; |
1117 |
} |
1118 |
ccs_realpath_unlock(); |
1119 |
/***** CRITICAL SECTION END *****/ |
1120 |
return depth; |
1121 |
} |
1122 |
|
1123 |
/** |
1124 |
* ccs_get_root_depth - return the depth of root directory. |
1125 |
* |
1126 |
* Returns number of directories to strip. |
1127 |
*/ |
1128 |
static int ccs_get_root_depth(void) |
1129 |
{ |
1130 |
int depth; |
1131 |
struct dentry *dentry; |
1132 |
struct vfsmount *vfsmnt; |
1133 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1134 |
struct path root; |
1135 |
#endif |
1136 |
/***** CRITICAL SECTION START *****/ |
1137 |
read_lock(¤t->fs->lock); |
1138 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1139 |
root = current->fs->root; |
1140 |
path_get(¤t->fs->root); |
1141 |
dentry = root.dentry; |
1142 |
vfsmnt = root.mnt; |
1143 |
#else |
1144 |
dentry = dget(current->fs->root); |
1145 |
vfsmnt = mntget(current->fs->rootmnt); |
1146 |
#endif |
1147 |
read_unlock(¤t->fs->lock); |
1148 |
/***** CRITICAL SECTION END *****/ |
1149 |
depth = ccs_root_depth(dentry, vfsmnt); |
1150 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1151 |
path_put(&root); |
1152 |
#else |
1153 |
dput(dentry); |
1154 |
mntput(vfsmnt); |
1155 |
#endif |
1156 |
return depth; |
1157 |
} |
1158 |
|
1159 |
static LIST_HEAD(ccs_execve_list); |
1160 |
static DEFINE_SPINLOCK(ccs_execve_list_lock); |
1161 |
|
1162 |
/** |
1163 |
* ccs_allocate_execve_entry - Allocate memory for execve(). |
1164 |
* |
1165 |
* Returns pointer to "struct ccs_execve_entry" on success, NULL otherwise. |
1166 |
*/ |
1167 |
static struct ccs_execve_entry *ccs_allocate_execve_entry(void) |
1168 |
{ |
1169 |
struct ccs_execve_entry *ee = ccs_alloc(sizeof(*ee), false); |
1170 |
if (!ee) |
1171 |
return NULL; |
1172 |
memset(ee, 0, sizeof(*ee)); |
1173 |
ee->program_path = ccs_alloc(CCS_MAX_PATHNAME_LEN, false); |
1174 |
ee->tmp = ccs_alloc(CCS_MAX_PATHNAME_LEN, false); |
1175 |
if (!ee->program_path || !ee->tmp) { |
1176 |
ccs_free(ee->program_path); |
1177 |
ccs_free(ee->tmp); |
1178 |
ccs_free(ee); |
1179 |
return NULL; |
1180 |
} |
1181 |
/* ee->dump->data is allocated by ccs_dump_page(). */ |
1182 |
ee->task = current; |
1183 |
/***** CRITICAL SECTION START *****/ |
1184 |
spin_lock(&ccs_execve_list_lock); |
1185 |
list_add(&ee->list, &ccs_execve_list); |
1186 |
spin_unlock(&ccs_execve_list_lock); |
1187 |
/***** CRITICAL SECTION END *****/ |
1188 |
return ee; |
1189 |
} |
1190 |
|
1191 |
/** |
1192 |
* ccs_find_execve_entry - Find ccs_execve_entry of current process. |
1193 |
* |
1194 |
* Returns pointer to "struct ccs_execve_entry" on success, NULL otherwise. |
1195 |
*/ |
1196 |
static struct ccs_execve_entry *ccs_find_execve_entry(void) |
1197 |
{ |
1198 |
struct task_struct *task = current; |
1199 |
struct ccs_execve_entry *ee = NULL; |
1200 |
struct ccs_execve_entry *p; |
1201 |
/***** CRITICAL SECTION START *****/ |
1202 |
spin_lock(&ccs_execve_list_lock); |
1203 |
list_for_each_entry(p, &ccs_execve_list, list) { |
1204 |
if (p->task != task) |
1205 |
continue; |
1206 |
ee = p; |
1207 |
break; |
1208 |
} |
1209 |
spin_unlock(&ccs_execve_list_lock); |
1210 |
/***** CRITICAL SECTION END *****/ |
1211 |
return ee; |
1212 |
} |
1213 |
|
1214 |
/** |
1215 |
* ccs_free_execve_entry - Free memory for execve(). |
1216 |
* |
1217 |
* @ee: Pointer to "struct ccs_execve_entry". |
1218 |
*/ |
1219 |
static void ccs_free_execve_entry(struct ccs_execve_entry *ee) |
1220 |
{ |
1221 |
if (!ee) |
1222 |
return; |
1223 |
/***** CRITICAL SECTION START *****/ |
1224 |
spin_lock(&ccs_execve_list_lock); |
1225 |
list_del(&ee->list); |
1226 |
spin_unlock(&ccs_execve_list_lock); |
1227 |
/***** CRITICAL SECTION END *****/ |
1228 |
ccs_free(ee->program_path); |
1229 |
ccs_free(ee->tmp); |
1230 |
kfree(ee->dump.data); |
1231 |
ccs_free(ee); |
1232 |
} |
1233 |
|
1234 |
/** |
1235 |
* ccs_try_alt_exec - Try to start execute handler. |
1236 |
* |
1237 |
* @ee: Pointer to "struct ccs_execve_entry". |
1238 |
* |
1239 |
* Returns 0 on success, negative value otherwise. |
1240 |
*/ |
1241 |
static int ccs_try_alt_exec(struct ccs_execve_entry *ee) |
1242 |
{ |
1243 |
/* |
1244 |
* Contents of modified bprm. |
1245 |
* The envp[] in original bprm is moved to argv[] so that |
1246 |
* the alternatively executed program won't be affected by |
1247 |
* some dangerous environment variables like LD_PRELOAD. |
1248 |
* |
1249 |
* modified bprm->argc |
1250 |
* = original bprm->argc + original bprm->envc + 7 |
1251 |
* modified bprm->envc |
1252 |
* = 0 |
1253 |
* |
1254 |
* modified bprm->argv[0] |
1255 |
* = the program's name specified by execute_handler |
1256 |
* modified bprm->argv[1] |
1257 |
* = ccs_current_domain()->domainname->name |
1258 |
* modified bprm->argv[2] |
1259 |
* = the current process's name |
1260 |
* modified bprm->argv[3] |
1261 |
* = the current process's information (e.g. uid/gid). |
1262 |
* modified bprm->argv[4] |
1263 |
* = original bprm->filename |
1264 |
* modified bprm->argv[5] |
1265 |
* = original bprm->argc in string expression |
1266 |
* modified bprm->argv[6] |
1267 |
* = original bprm->envc in string expression |
1268 |
* modified bprm->argv[7] |
1269 |
* = original bprm->argv[0] |
1270 |
* ... |
1271 |
* modified bprm->argv[bprm->argc + 6] |
1272 |
* = original bprm->argv[bprm->argc - 1] |
1273 |
* modified bprm->argv[bprm->argc + 7] |
1274 |
* = original bprm->envp[0] |
1275 |
* ... |
1276 |
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
1277 |
* = original bprm->envp[bprm->envc - 1] |
1278 |
*/ |
1279 |
struct linux_binprm *bprm = ee->bprm; |
1280 |
struct file *filp; |
1281 |
int retval; |
1282 |
const int original_argc = bprm->argc; |
1283 |
const int original_envc = bprm->envc; |
1284 |
struct task_struct *task = current; |
1285 |
|
1286 |
/* Close the requested program's dentry. */ |
1287 |
allow_write_access(bprm->file); |
1288 |
fput(bprm->file); |
1289 |
bprm->file = NULL; |
1290 |
|
1291 |
/* Invalidate page dump cache. */ |
1292 |
ee->dump.page = NULL; |
1293 |
|
1294 |
/* Move envp[] to argv[] */ |
1295 |
bprm->argc += bprm->envc; |
1296 |
bprm->envc = 0; |
1297 |
|
1298 |
/* Set argv[6] */ |
1299 |
{ |
1300 |
char *cp = ee->tmp; |
1301 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); |
1302 |
retval = copy_strings_kernel(1, &cp, bprm); |
1303 |
if (retval < 0) |
1304 |
goto out; |
1305 |
bprm->argc++; |
1306 |
} |
1307 |
|
1308 |
/* Set argv[5] */ |
1309 |
{ |
1310 |
char *cp = ee->tmp; |
1311 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); |
1312 |
retval = copy_strings_kernel(1, &cp, bprm); |
1313 |
if (retval < 0) |
1314 |
goto out; |
1315 |
bprm->argc++; |
1316 |
} |
1317 |
|
1318 |
/* Set argv[4] */ |
1319 |
{ |
1320 |
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
1321 |
if (retval < 0) |
1322 |
goto out; |
1323 |
bprm->argc++; |
1324 |
} |
1325 |
|
1326 |
/* Set argv[3] */ |
1327 |
{ |
1328 |
char *cp = ee->tmp; |
1329 |
const u32 ccs_flags = task->ccs_flags; |
1330 |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, |
1331 |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
1332 |
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
1333 |
"state[1]=%u state[2]=%u", |
1334 |
(pid_t) sys_getpid(), current_uid(), current_gid(), |
1335 |
current_euid(), current_egid(), current_suid(), |
1336 |
current_sgid(), current_fsuid(), current_fsgid(), |
1337 |
(u8) (ccs_flags >> 24), (u8) (ccs_flags >> 16), |
1338 |
(u8) (ccs_flags >> 8)); |
1339 |
retval = copy_strings_kernel(1, &cp, bprm); |
1340 |
if (retval < 0) |
1341 |
goto out; |
1342 |
bprm->argc++; |
1343 |
} |
1344 |
|
1345 |
/* Set argv[2] */ |
1346 |
{ |
1347 |
char *exe = (char *) ccs_get_exe(); |
1348 |
if (exe) { |
1349 |
retval = copy_strings_kernel(1, &exe, bprm); |
1350 |
ccs_free(exe); |
1351 |
} else { |
1352 |
exe = ee->tmp; |
1353 |
strncpy(ee->tmp, "<unknown>", CCS_EXEC_TMPSIZE - 1); |
1354 |
retval = copy_strings_kernel(1, &exe, bprm); |
1355 |
} |
1356 |
if (retval < 0) |
1357 |
goto out; |
1358 |
bprm->argc++; |
1359 |
} |
1360 |
|
1361 |
/* Set argv[1] */ |
1362 |
{ |
1363 |
char *cp = ee->tmp; |
1364 |
strncpy(ee->tmp, ccs_current_domain()->domainname->name, |
1365 |
CCS_EXEC_TMPSIZE - 1); |
1366 |
retval = copy_strings_kernel(1, &cp, bprm); |
1367 |
if (retval < 0) |
1368 |
goto out; |
1369 |
bprm->argc++; |
1370 |
} |
1371 |
|
1372 |
/* Set argv[0] */ |
1373 |
{ |
1374 |
int depth = ccs_get_root_depth(); |
1375 |
char *cp = ee->program_path; |
1376 |
strncpy(cp, ee->handler->name, CCS_MAX_PATHNAME_LEN - 1); |
1377 |
ccs_unescape(cp); |
1378 |
retval = -ENOENT; |
1379 |
if (!*cp || *cp != '/') |
1380 |
goto out; |
1381 |
/* Adjust root directory for open_exec(). */ |
1382 |
while (depth) { |
1383 |
cp = strchr(cp + 1, '/'); |
1384 |
if (!cp) |
1385 |
goto out; |
1386 |
depth--; |
1387 |
} |
1388 |
memmove(ee->program_path, cp, strlen(cp) + 1); |
1389 |
cp = ee->program_path; |
1390 |
retval = copy_strings_kernel(1, &cp, bprm); |
1391 |
if (retval < 0) |
1392 |
goto out; |
1393 |
bprm->argc++; |
1394 |
} |
1395 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
1396 |
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
1397 |
bprm->argv_len = bprm->exec - bprm->p; |
1398 |
#endif |
1399 |
#endif |
1400 |
|
1401 |
/* OK, now restart the process with execute handler program's dentry. */ |
1402 |
filp = open_exec(ee->program_path); |
1403 |
if (IS_ERR(filp)) { |
1404 |
retval = PTR_ERR(filp); |
1405 |
goto out; |
1406 |
} |
1407 |
bprm->file = filp; |
1408 |
bprm->filename = ee->program_path; |
1409 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1410 |
bprm->interp = bprm->filename; |
1411 |
#endif |
1412 |
retval = prepare_binprm(bprm); |
1413 |
if (retval < 0) |
1414 |
goto out; |
1415 |
{ |
1416 |
/* |
1417 |
* Backup ee->program_path because ccs_find_next_domain() will |
1418 |
* overwrite ee->program_path and ee->tmp. |
1419 |
*/ |
1420 |
const int len = strlen(ee->program_path) + 1; |
1421 |
char *cp = kmalloc(len, GFP_KERNEL); |
1422 |
if (!cp) { |
1423 |
retval = -ENOMEM; |
1424 |
goto out; |
1425 |
} |
1426 |
memmove(cp, ee->program_path, len); |
1427 |
bprm->filename = cp; |
1428 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1429 |
bprm->interp = bprm->filename; |
1430 |
#endif |
1431 |
task->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1432 |
retval = ccs_find_next_domain(ee); |
1433 |
task->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1434 |
/* Restore ee->program_path for search_binary_handler(). */ |
1435 |
memmove(ee->program_path, cp, len); |
1436 |
bprm->filename = ee->program_path; |
1437 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1438 |
bprm->interp = bprm->filename; |
1439 |
#endif |
1440 |
kfree(cp); |
1441 |
} |
1442 |
out: |
1443 |
return retval; |
1444 |
} |
1445 |
|
1446 |
/** |
1447 |
* ccs_find_execute_handler - Find an execute handler. |
1448 |
* |
1449 |
* @ee: Pointer to "struct ccs_execve_entry". |
1450 |
* @type: Type of execute handler. |
1451 |
* |
1452 |
* Returns true if found, false otherwise. |
1453 |
* |
1454 |
* Caller holds srcu_read_lock(&ccs_ss). |
1455 |
*/ |
1456 |
static bool ccs_find_execute_handler(struct ccs_execve_entry *ee, |
1457 |
const u8 type) |
1458 |
{ |
1459 |
struct task_struct *task = current; |
1460 |
const struct ccs_domain_info *domain = ccs_current_domain(); |
1461 |
struct ccs_acl_info *ptr; |
1462 |
bool found = false; |
1463 |
/* |
1464 |
* Don't use execute handler if the current process is |
1465 |
* marked as execute handler to avoid infinite execute handler loop. |
1466 |
*/ |
1467 |
if (task->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER) |
1468 |
return false; |
1469 |
list_for_each_entry(ptr, &domain->acl_info_list, list) { |
1470 |
struct ccs_execute_handler_record *acl; |
1471 |
if (ptr->type != type) |
1472 |
continue; |
1473 |
acl = container_of(ptr, struct ccs_execute_handler_record, |
1474 |
head); |
1475 |
ee->handler = acl->handler; |
1476 |
found = true; |
1477 |
break; |
1478 |
} |
1479 |
return found; |
1480 |
} |
1481 |
|
1482 |
/** |
1483 |
* ccs_dump_page - Dump a page to buffer. |
1484 |
* |
1485 |
* @bprm: Pointer to "struct linux_binprm". |
1486 |
* @pos: Location to dump. |
1487 |
* @dump: Poiner to "struct ccs_page_dump". |
1488 |
* |
1489 |
* Returns true on success, false otherwise. |
1490 |
*/ |
1491 |
bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, |
1492 |
struct ccs_page_dump *dump) |
1493 |
{ |
1494 |
struct page *page; |
1495 |
/* dump->data is released by ccs_free_execve_entry(). */ |
1496 |
if (!dump->data) { |
1497 |
dump->data = kmalloc(PAGE_SIZE, GFP_KERNEL); |
1498 |
if (!dump->data) |
1499 |
return false; |
1500 |
} |
1501 |
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
1502 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1503 |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1504 |
return false; |
1505 |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR == 3 && defined(CONFIG_MMU) |
1506 |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1507 |
return false; |
1508 |
#else |
1509 |
page = bprm->page[pos / PAGE_SIZE]; |
1510 |
#endif |
1511 |
if (page != dump->page) { |
1512 |
const unsigned int offset = pos % PAGE_SIZE; |
1513 |
/* |
1514 |
* Maybe kmap()/kunmap() should be used here. |
1515 |
* But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). |
1516 |
* So do I. |
1517 |
*/ |
1518 |
char *kaddr = kmap_atomic(page, KM_USER0); |
1519 |
dump->page = page; |
1520 |
memcpy(dump->data + offset, kaddr + offset, PAGE_SIZE - offset); |
1521 |
kunmap_atomic(kaddr, KM_USER0); |
1522 |
} |
1523 |
/* Same with put_arg_page(page) in fs/exec.c */ |
1524 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1525 |
put_page(page); |
1526 |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR == 3 && defined(CONFIG_MMU) |
1527 |
put_page(page); |
1528 |
#endif |
1529 |
return true; |
1530 |
} |
1531 |
|
1532 |
/** |
1533 |
* ccs_fetch_next_domain - Fetch next_domain from the list. |
1534 |
* |
1535 |
* Returns pointer to "struct ccs_domain_info" which will be used if execve() |
1536 |
* succeeds. This function does not return NULL. |
1537 |
*/ |
1538 |
struct ccs_domain_info *ccs_fetch_next_domain(void) |
1539 |
{ |
1540 |
struct ccs_execve_entry *ee = ccs_find_execve_entry(); |
1541 |
struct ccs_domain_info *next_domain = NULL; |
1542 |
if (ee) |
1543 |
next_domain = ee->r.domain; |
1544 |
if (!next_domain) |
1545 |
next_domain = ccs_current_domain(); |
1546 |
return next_domain; |
1547 |
} |
1548 |
|
1549 |
/** |
1550 |
* ccs_start_execve - Prepare for execve() operation. |
1551 |
* |
1552 |
* @bprm: Pointer to "struct linux_binprm". |
1553 |
* |
1554 |
* Returns 0 on success, negative value otherwise. |
1555 |
*/ |
1556 |
int ccs_start_execve(struct linux_binprm *bprm) |
1557 |
{ |
1558 |
int retval; |
1559 |
struct task_struct *task = current; |
1560 |
struct ccs_execve_entry *ee = ccs_allocate_execve_entry(); |
1561 |
if (!ccs_policy_loaded) |
1562 |
ccs_load_policy(bprm->filename); |
1563 |
if (!ee) |
1564 |
return -ENOMEM; |
1565 |
ccs_init_request_info(&ee->r, NULL, CCS_MAC_FOR_FILE); |
1566 |
ee->r.ee = ee; |
1567 |
ee->bprm = bprm; |
1568 |
ee->r.obj = &ee->obj; |
1569 |
ee->obj.path1_dentry = bprm->file->f_dentry; |
1570 |
ee->obj.path1_vfsmnt = bprm->file->f_vfsmnt; |
1571 |
/* Clear manager flag. */ |
1572 |
task->ccs_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
1573 |
if (ccs_find_execute_handler(ee, TYPE_EXECUTE_HANDLER)) { |
1574 |
retval = ccs_try_alt_exec(ee); |
1575 |
if (!retval) |
1576 |
ccs_audit_execute_handler_log(ee, true); |
1577 |
goto ok; |
1578 |
} |
1579 |
retval = ccs_find_next_domain(ee); |
1580 |
if (retval != -EPERM) |
1581 |
goto ok; |
1582 |
if (ccs_find_execute_handler(ee, TYPE_DENIED_EXECUTE_HANDLER)) { |
1583 |
retval = ccs_try_alt_exec(ee); |
1584 |
if (!retval) |
1585 |
ccs_audit_execute_handler_log(ee, false); |
1586 |
} |
1587 |
ok: |
1588 |
if (retval < 0) |
1589 |
goto out; |
1590 |
ee->r.mode = ccs_check_flags(ee->r.domain, CCS_MAC_FOR_ENV); |
1591 |
retval = ccs_check_environ(ee); |
1592 |
if (retval < 0) |
1593 |
goto out; |
1594 |
task->ccs_flags |= CCS_CHECK_READ_FOR_OPEN_EXEC; |
1595 |
retval = 0; |
1596 |
out: |
1597 |
if (retval) |
1598 |
ccs_finish_execve(retval); |
1599 |
return retval; |
1600 |
} |
1601 |
|
1602 |
/** |
1603 |
* ccs_finish_execve - Clean up execve() operation. |
1604 |
* |
1605 |
* @retval: Return code of an execve() operation. |
1606 |
* |
1607 |
* Caller holds srcu_read_lock(&ccs_ss). |
1608 |
*/ |
1609 |
void ccs_finish_execve(int retval) |
1610 |
{ |
1611 |
struct task_struct *task = current; |
1612 |
struct ccs_execve_entry *ee = ccs_find_execve_entry(); |
1613 |
task->ccs_flags &= ~CCS_CHECK_READ_FOR_OPEN_EXEC; |
1614 |
if (!ee) |
1615 |
return; |
1616 |
if (retval < 0) |
1617 |
goto out; |
1618 |
/* Proceed to next domain if execution suceeded. */ |
1619 |
task->ccs_domain_info = ee->r.domain; |
1620 |
/* Mark the current process as execute handler. */ |
1621 |
if (ee->handler) |
1622 |
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
1623 |
/* Mark the current process as normal process. */ |
1624 |
else |
1625 |
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
1626 |
out: |
1627 |
ccs_free_execve_entry(ee); |
1628 |
} |
1629 |
|
1630 |
#else |
1631 |
|
1632 |
/** |
1633 |
* ccs_start_execve - Prepare for execve() operation. |
1634 |
* |
1635 |
* @bprm: Pointer to "struct linux_binprm". |
1636 |
* |
1637 |
* Returns 0. |
1638 |
*/ |
1639 |
int ccs_start_execve(struct linux_binprm *bprm) |
1640 |
{ |
1641 |
#ifdef CONFIG_SAKURA |
1642 |
/* Clear manager flag. */ |
1643 |
current->ccs_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
1644 |
if (!ccs_policy_loaded) |
1645 |
ccs_load_policy(bprm->filename); |
1646 |
#endif |
1647 |
return 0; |
1648 |
} |
1649 |
|
1650 |
/** |
1651 |
* ccs_finish_execve - Clean up execve() operation. |
1652 |
*/ |
1653 |
void ccs_finish_execve(int retval) |
1654 |
{ |
1655 |
} |
1656 |
|
1657 |
#endif |