1 |
/* |
2 |
* fs/tomoyo_network.c |
3 |
* |
4 |
* Implementation of the Domain-Based Mandatory Access Control. |
5 |
* |
6 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
7 |
* |
8 |
* Version: 1.6.5-pre 2008/10/07 |
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/net.h> |
19 |
#include <linux/inet.h> |
20 |
#include <linux/in.h> |
21 |
#include <linux/in6.h> |
22 |
|
23 |
/** |
24 |
* audit_network_log - Audit network log. |
25 |
* |
26 |
* @r: Pointer to "struct ccs_request_info". |
27 |
* @operation: The name of operation. |
28 |
* @address: An IPv4 or IPv6 address. |
29 |
* @port: Port number. |
30 |
* @is_granted: True if this is a granted log. |
31 |
* |
32 |
* Returns 0 on success, negative value otherwise. |
33 |
*/ |
34 |
static int audit_network_log(struct ccs_request_info *r, const char *operation, |
35 |
const char *address, const u16 port, |
36 |
const bool is_granted) |
37 |
{ |
38 |
return ccs_write_audit_log(is_granted, r, KEYWORD_ALLOW_NETWORK |
39 |
"%s %s %u\n", operation, address, port); |
40 |
} |
41 |
|
42 |
/** |
43 |
* save_ipv6_address - Keep the given IPv6 address on the RAM. |
44 |
* |
45 |
* @addr: Pointer to "struct in6_addr". |
46 |
* |
47 |
* Returns pointer to "struct in6_addr" on success, NULL otherwise. |
48 |
* |
49 |
* The RAM is shared, so NEVER try to modify or kfree() the returned address. |
50 |
*/ |
51 |
static const struct in6_addr *save_ipv6_address(const struct in6_addr *addr) |
52 |
{ |
53 |
static const u8 block_size = 16; |
54 |
struct addr_list { |
55 |
/* Workaround for gcc 4.3's bug. */ |
56 |
struct in6_addr addr[16]; /* = block_size */ |
57 |
struct list1_head list; |
58 |
u32 in_use_count; |
59 |
}; |
60 |
static LIST1_HEAD(address_list); |
61 |
struct addr_list *ptr; |
62 |
static DEFINE_MUTEX(lock); |
63 |
u8 i = block_size; |
64 |
if (!addr) |
65 |
return NULL; |
66 |
mutex_lock(&lock); |
67 |
list1_for_each_entry(ptr, &address_list, list) { |
68 |
for (i = 0; i < ptr->in_use_count; i++) { |
69 |
if (!memcmp(&ptr->addr[i], addr, sizeof(*addr))) |
70 |
goto ok; |
71 |
} |
72 |
if (i < block_size) |
73 |
break; |
74 |
} |
75 |
if (i == block_size) { |
76 |
ptr = ccs_alloc_element(sizeof(*ptr)); |
77 |
if (!ptr) |
78 |
goto ok; |
79 |
list1_add_tail_mb(&ptr->list, &address_list); |
80 |
i = 0; |
81 |
} |
82 |
ptr->addr[ptr->in_use_count++] = *addr; |
83 |
ok: |
84 |
mutex_unlock(&lock); |
85 |
return ptr ? &ptr->addr[i] : NULL; |
86 |
} |
87 |
|
88 |
/* The list for "struct address_group_entry". */ |
89 |
static LIST1_HEAD(address_group_list); |
90 |
|
91 |
/** |
92 |
* update_address_group_entry - Update "struct address_group_entry" list. |
93 |
* |
94 |
* @group_name: The name of address group. |
95 |
* @is_ipv6: True if @min_address and @max_address are IPv6 addresses. |
96 |
* @min_address: Start of IPv4 or IPv6 address range. |
97 |
* @max_address: End of IPv4 or IPv6 address range. |
98 |
* @is_delete: True if it is a delete request. |
99 |
* |
100 |
* Returns 0 on success, negative value otherwise. |
101 |
*/ |
102 |
static int update_address_group_entry(const char *group_name, |
103 |
const bool is_ipv6, |
104 |
const u16 *min_address, |
105 |
const u16 *max_address, |
106 |
const bool is_delete) |
107 |
{ |
108 |
static DEFINE_MUTEX(lock); |
109 |
struct address_group_entry *new_group; |
110 |
struct address_group_entry *group; |
111 |
struct address_group_member *new_member; |
112 |
struct address_group_member *member; |
113 |
const struct path_info *saved_group_name; |
114 |
const struct in6_addr *saved_min_address = NULL; |
115 |
const struct in6_addr *saved_max_address = NULL; |
116 |
int error = -ENOMEM; |
117 |
bool found = false; |
118 |
if (!ccs_is_correct_path(group_name, 0, 0, 0, __func__) || |
119 |
!group_name[0]) |
120 |
return -EINVAL; |
121 |
saved_group_name = ccs_save_name(group_name); |
122 |
if (!saved_group_name) |
123 |
return -ENOMEM; |
124 |
if (!is_ipv6) |
125 |
goto not_ipv6; |
126 |
saved_min_address |
127 |
= save_ipv6_address((struct in6_addr *) min_address); |
128 |
saved_max_address |
129 |
= save_ipv6_address((struct in6_addr *) max_address); |
130 |
if (!saved_min_address || !saved_max_address) |
131 |
return -ENOMEM; |
132 |
not_ipv6: |
133 |
mutex_lock(&lock); |
134 |
list1_for_each_entry(group, &address_group_list, list) { |
135 |
if (saved_group_name != group->group_name) |
136 |
continue; |
137 |
list1_for_each_entry(member, &group->address_group_member_list, |
138 |
list) { |
139 |
if (member->is_ipv6 != is_ipv6) |
140 |
continue; |
141 |
if (is_ipv6) { |
142 |
if (member->min.ipv6 != saved_min_address || |
143 |
member->max.ipv6 != saved_max_address) |
144 |
continue; |
145 |
} else { |
146 |
if (member->min.ipv4 != *(u32 *) min_address || |
147 |
member->max.ipv4 != *(u32 *) max_address) |
148 |
continue; |
149 |
} |
150 |
member->is_deleted = is_delete; |
151 |
error = 0; |
152 |
goto out; |
153 |
} |
154 |
found = true; |
155 |
break; |
156 |
} |
157 |
if (is_delete) { |
158 |
error = -ENOENT; |
159 |
goto out; |
160 |
} |
161 |
if (!found) { |
162 |
new_group = ccs_alloc_element(sizeof(*new_group)); |
163 |
if (!new_group) |
164 |
goto out; |
165 |
INIT_LIST1_HEAD(&new_group->address_group_member_list); |
166 |
new_group->group_name = saved_group_name; |
167 |
list1_add_tail_mb(&new_group->list, &address_group_list); |
168 |
group = new_group; |
169 |
} |
170 |
new_member = ccs_alloc_element(sizeof(*new_member)); |
171 |
if (!new_member) |
172 |
goto out; |
173 |
new_member->is_ipv6 = is_ipv6; |
174 |
if (is_ipv6) { |
175 |
new_member->min.ipv6 = saved_min_address; |
176 |
new_member->max.ipv6 = saved_max_address; |
177 |
} else { |
178 |
new_member->min.ipv4 = *(u32 *) min_address; |
179 |
new_member->max.ipv4 = *(u32 *) max_address; |
180 |
} |
181 |
list1_add_tail_mb(&new_member->list, &group->address_group_member_list); |
182 |
error = 0; |
183 |
out: |
184 |
mutex_unlock(&lock); |
185 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
186 |
return error; |
187 |
} |
188 |
|
189 |
/** |
190 |
* parse_ip_address - Parse an IP address. |
191 |
* |
192 |
* @address: String to parse. |
193 |
* @min: Pointer to store min address. |
194 |
* @max: Pointer to store max address. |
195 |
* |
196 |
* Returns 2 if @address is an IPv6, 1 if @address is an IPv4, 0 otherwise. |
197 |
*/ |
198 |
static int parse_ip_address(char *address, u16 *min, u16 *max) |
199 |
{ |
200 |
int count = sscanf(address, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx" |
201 |
"-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
202 |
&min[0], &min[1], &min[2], &min[3], |
203 |
&min[4], &min[5], &min[6], &min[7], |
204 |
&max[0], &max[1], &max[2], &max[3], |
205 |
&max[4], &max[5], &max[6], &max[7]); |
206 |
if (count == 8 || count == 16) { |
207 |
u8 i; |
208 |
if (count == 8) |
209 |
memmove(max, min, sizeof(u16) * 8); |
210 |
for (i = 0; i < 8; i++) { |
211 |
min[i] = htons(min[i]); |
212 |
max[i] = htons(max[i]); |
213 |
} |
214 |
return 2; |
215 |
} |
216 |
count = sscanf(address, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
217 |
&min[0], &min[1], &min[2], &min[3], |
218 |
&max[0], &max[1], &max[2], &max[3]); |
219 |
if (count == 4 || count == 8) { |
220 |
u8 *p = (void *) min; |
221 |
*p++ = min[0]; |
222 |
*p++ = min[1]; |
223 |
*p++ = min[2]; |
224 |
*p = min[3]; |
225 |
if (count == 4) |
226 |
memmove(max, min, sizeof(u16) * 4); |
227 |
p = (void *) max; |
228 |
*p++ = max[0]; |
229 |
*p++ = max[1]; |
230 |
*p++ = max[2]; |
231 |
*p = max[3]; |
232 |
return 1; |
233 |
} |
234 |
return 0; |
235 |
} |
236 |
|
237 |
/** |
238 |
* ccs_write_address_group_policy - Write "struct address_group_entry" list. |
239 |
* |
240 |
* @data: String to parse. |
241 |
* @is_delete: True if it is a delete request. |
242 |
* |
243 |
* Returns 0 on success, negative value otherwise. |
244 |
*/ |
245 |
int ccs_write_address_group_policy(char *data, const bool is_delete) |
246 |
{ |
247 |
bool is_ipv6; |
248 |
u16 min_address[8]; |
249 |
u16 max_address[8]; |
250 |
char *cp = strchr(data, ' '); |
251 |
if (!cp) |
252 |
return -EINVAL; |
253 |
*cp++ = '\0'; |
254 |
switch (parse_ip_address(cp, min_address, max_address)) { |
255 |
case 2: |
256 |
is_ipv6 = true; |
257 |
break; |
258 |
case 1: |
259 |
is_ipv6 = false; |
260 |
break; |
261 |
default: |
262 |
return -EINVAL; |
263 |
} |
264 |
return update_address_group_entry(data, is_ipv6, |
265 |
min_address, max_address, is_delete); |
266 |
} |
267 |
|
268 |
/** |
269 |
* find_or_assign_new_address_group - Create address group. |
270 |
* |
271 |
* @group_name: The name of address group. |
272 |
* |
273 |
* Returns pointer to "struct address_group_entry" on success, NULL otherwise. |
274 |
*/ |
275 |
static struct address_group_entry * |
276 |
find_or_assign_new_address_group(const char *group_name) |
277 |
{ |
278 |
u8 i; |
279 |
struct address_group_entry *group; |
280 |
for (i = 0; i <= 1; i++) { |
281 |
list1_for_each_entry(group, &address_group_list, list) { |
282 |
if (!strcmp(group_name, group->group_name->name)) |
283 |
return group; |
284 |
} |
285 |
if (!i) { |
286 |
const u16 dummy[2] = { 0, 0 }; |
287 |
update_address_group_entry(group_name, false, |
288 |
dummy, dummy, false); |
289 |
update_address_group_entry(group_name, false, |
290 |
dummy, dummy, true); |
291 |
} |
292 |
} |
293 |
return NULL; |
294 |
} |
295 |
|
296 |
/** |
297 |
* address_matches_to_group - Check whether the given address matches members of the given address group. |
298 |
* |
299 |
* @is_ipv6: True if @address is an IPv6 address. |
300 |
* @address: An IPv4 or IPv6 address. |
301 |
* @group: Pointer to "struct address_group_entry". |
302 |
* |
303 |
* Returns true if @address matches addresses in @group group, false otherwise. |
304 |
*/ |
305 |
static bool address_matches_to_group(const bool is_ipv6, const u32 *address, |
306 |
const struct address_group_entry *group) |
307 |
{ |
308 |
struct address_group_member *member; |
309 |
const u32 ip = ntohl(*address); |
310 |
list1_for_each_entry(member, &group->address_group_member_list, list) { |
311 |
if (member->is_deleted) |
312 |
continue; |
313 |
if (member->is_ipv6) { |
314 |
if (is_ipv6 && |
315 |
memcmp(member->min.ipv6, address, 16) <= 0 && |
316 |
memcmp(address, member->max.ipv6, 16) <= 0) |
317 |
return true; |
318 |
} else { |
319 |
if (!is_ipv6 && |
320 |
member->min.ipv4 <= ip && ip <= member->max.ipv4) |
321 |
return true; |
322 |
} |
323 |
} |
324 |
return false; |
325 |
} |
326 |
|
327 |
/** |
328 |
* ccs_read_address_group_policy - Read "struct address_group_entry" list. |
329 |
* |
330 |
* @head: Pointer to "struct ccs_io_buffer". |
331 |
* |
332 |
* Returns true on success, false otherwise. |
333 |
*/ |
334 |
bool ccs_read_address_group_policy(struct ccs_io_buffer *head) |
335 |
{ |
336 |
struct list1_head *gpos; |
337 |
struct list1_head *mpos; |
338 |
list1_for_each_cookie(gpos, head->read_var1, &address_group_list) { |
339 |
struct address_group_entry *group; |
340 |
group = list1_entry(gpos, struct address_group_entry, list); |
341 |
list1_for_each_cookie(mpos, head->read_var2, |
342 |
&group->address_group_member_list) { |
343 |
char buf[128]; |
344 |
struct address_group_member *member; |
345 |
member = list1_entry(mpos, struct address_group_member, |
346 |
list); |
347 |
if (member->is_deleted) |
348 |
continue; |
349 |
if (member->is_ipv6) { |
350 |
const struct in6_addr *min_address |
351 |
= member->min.ipv6; |
352 |
const struct in6_addr *max_address |
353 |
= member->max.ipv6; |
354 |
ccs_print_ipv6(buf, sizeof(buf), min_address); |
355 |
if (min_address != max_address) { |
356 |
int len; |
357 |
char *cp = strchr(buf, '\0'); |
358 |
*cp++ = '-'; |
359 |
len = strlen(buf); |
360 |
ccs_print_ipv6(cp, sizeof(buf) - len, |
361 |
max_address); |
362 |
} |
363 |
} else { |
364 |
const u32 min_address = member->min.ipv4; |
365 |
const u32 max_address = member->max.ipv4; |
366 |
memset(buf, 0, sizeof(buf)); |
367 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", |
368 |
HIPQUAD(min_address)); |
369 |
if (min_address != max_address) { |
370 |
const int len = strlen(buf); |
371 |
snprintf(buf + len, |
372 |
sizeof(buf) - 1 - len, |
373 |
"-%u.%u.%u.%u", |
374 |
HIPQUAD(max_address)); |
375 |
} |
376 |
} |
377 |
if (!ccs_io_printf(head, KEYWORD_ADDRESS_GROUP |
378 |
"%s %s\n", group->group_name->name, |
379 |
buf)) |
380 |
goto out; |
381 |
} |
382 |
} |
383 |
return true; |
384 |
out: |
385 |
return false; |
386 |
} |
387 |
|
388 |
#if !defined(NIP6) |
389 |
#define NIP6(addr) \ |
390 |
ntohs((addr).s6_addr16[0]), ntohs((addr).s6_addr16[1]), \ |
391 |
ntohs((addr).s6_addr16[2]), ntohs((addr).s6_addr16[3]), \ |
392 |
ntohs((addr).s6_addr16[4]), ntohs((addr).s6_addr16[5]), \ |
393 |
ntohs((addr).s6_addr16[6]), ntohs((addr).s6_addr16[7]) |
394 |
#endif |
395 |
|
396 |
/** |
397 |
* ccs_print_ipv6 - Print an IPv6 address. |
398 |
* |
399 |
* @buffer: Buffer to write to. |
400 |
* @buffer_len: Size of @buffer. |
401 |
* @ip: Pointer to "struct in6_addr". |
402 |
* |
403 |
* Returns nothing. |
404 |
*/ |
405 |
void ccs_print_ipv6(char *buffer, const int buffer_len, |
406 |
const struct in6_addr *ip) |
407 |
{ |
408 |
memset(buffer, 0, buffer_len); |
409 |
snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip)); |
410 |
} |
411 |
|
412 |
/** |
413 |
* ccs_net2keyword - Convert network operation index to network operation name. |
414 |
* |
415 |
* @operation: Type of operation. |
416 |
* |
417 |
* Returns the name of operation. |
418 |
*/ |
419 |
const char *ccs_net2keyword(const u8 operation) |
420 |
{ |
421 |
const char *keyword = "unknown"; |
422 |
switch (operation) { |
423 |
case NETWORK_ACL_UDP_BIND: |
424 |
keyword = "UDP bind"; |
425 |
break; |
426 |
case NETWORK_ACL_UDP_CONNECT: |
427 |
keyword = "UDP connect"; |
428 |
break; |
429 |
case NETWORK_ACL_TCP_BIND: |
430 |
keyword = "TCP bind"; |
431 |
break; |
432 |
case NETWORK_ACL_TCP_LISTEN: |
433 |
keyword = "TCP listen"; |
434 |
break; |
435 |
case NETWORK_ACL_TCP_CONNECT: |
436 |
keyword = "TCP connect"; |
437 |
break; |
438 |
case NETWORK_ACL_TCP_ACCEPT: |
439 |
keyword = "TCP accept"; |
440 |
break; |
441 |
case NETWORK_ACL_RAW_BIND: |
442 |
keyword = "RAW bind"; |
443 |
break; |
444 |
case NETWORK_ACL_RAW_CONNECT: |
445 |
keyword = "RAW connect"; |
446 |
break; |
447 |
} |
448 |
return keyword; |
449 |
} |
450 |
|
451 |
/** |
452 |
* update_network_entry - Update "struct ip_network_acl_record" list. |
453 |
* |
454 |
* @operation: Type of operation. |
455 |
* @record_type: Type of address. |
456 |
* @group: Pointer to "struct address_group_entry". May be NULL. |
457 |
* @min_address: Start of IPv4 or IPv6 address range. |
458 |
* @max_address: End of IPv4 or IPv6 address range. |
459 |
* @min_port: Start of port number range. |
460 |
* @max_port: End of port number range. |
461 |
* @domain: Pointer to "struct domain_info". |
462 |
* @condition: Pointer to "struct condition_list". May be NULL. |
463 |
* @is_delete: True if it is a delete request. |
464 |
* |
465 |
* Returns 0 on success, negative value otherwise. |
466 |
*/ |
467 |
static int update_network_entry(const u8 operation, const u8 record_type, |
468 |
const struct address_group_entry *group, |
469 |
const u32 *min_address, const u32 *max_address, |
470 |
const u16 min_port, const u16 max_port, |
471 |
struct domain_info *domain, |
472 |
const struct condition_list *condition, |
473 |
const bool is_delete) |
474 |
{ |
475 |
struct acl_info *ptr; |
476 |
struct ip_network_acl_record *acl; |
477 |
int error = -ENOMEM; |
478 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
479 |
const u32 min_ip = ntohl(*min_address); |
480 |
const u32 max_ip = ntohl(*max_address); |
481 |
const struct in6_addr *saved_min_address = NULL; |
482 |
const struct in6_addr *saved_max_address = NULL; |
483 |
if (!domain) |
484 |
return -EINVAL; |
485 |
if (record_type != IP_RECORD_TYPE_IPv6) |
486 |
goto not_ipv6; |
487 |
saved_min_address = save_ipv6_address((struct in6_addr *) min_address); |
488 |
saved_max_address = save_ipv6_address((struct in6_addr *) max_address); |
489 |
if (!saved_min_address || !saved_max_address) |
490 |
return -ENOMEM; |
491 |
not_ipv6: |
492 |
mutex_lock(&domain_acl_lock); |
493 |
if (is_delete) |
494 |
goto delete; |
495 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
496 |
if (ccs_acl_type1(ptr) != TYPE_IP_NETWORK_ACL) |
497 |
continue; |
498 |
if (ccs_get_condition_part(ptr) != condition) |
499 |
continue; |
500 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
501 |
if (acl->operation_type != operation || |
502 |
acl->record_type != record_type || |
503 |
acl->min_port != min_port || max_port != acl->max_port) |
504 |
continue; |
505 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
506 |
if (acl->u.group != group) |
507 |
continue; |
508 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
509 |
if (acl->u.ipv4.min != min_ip || |
510 |
max_ip != acl->u.ipv4.max) |
511 |
continue; |
512 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
513 |
if (acl->u.ipv6.min != saved_min_address || |
514 |
saved_max_address != acl->u.ipv6.max) |
515 |
continue; |
516 |
} |
517 |
error = ccs_add_domain_acl(NULL, ptr); |
518 |
goto out; |
519 |
} |
520 |
/* Not found. Append it to the tail. */ |
521 |
acl = ccs_alloc_acl_element(TYPE_IP_NETWORK_ACL, condition); |
522 |
if (!acl) |
523 |
goto out; |
524 |
acl->operation_type = operation; |
525 |
acl->record_type = record_type; |
526 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
527 |
acl->u.group = group; |
528 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
529 |
acl->u.ipv4.min = min_ip; |
530 |
acl->u.ipv4.max = max_ip; |
531 |
} else { |
532 |
acl->u.ipv6.min = saved_min_address; |
533 |
acl->u.ipv6.max = saved_max_address; |
534 |
} |
535 |
acl->min_port = min_port; |
536 |
acl->max_port = max_port; |
537 |
error = ccs_add_domain_acl(domain, &acl->head); |
538 |
goto out; |
539 |
delete: |
540 |
error = -ENOENT; |
541 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
542 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
543 |
continue; |
544 |
if (ccs_get_condition_part(ptr) != condition) |
545 |
continue; |
546 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
547 |
if (acl->operation_type != operation || |
548 |
acl->record_type != record_type || |
549 |
acl->min_port != min_port || max_port != acl->max_port) |
550 |
continue; |
551 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
552 |
if (acl->u.group != group) |
553 |
continue; |
554 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
555 |
if (acl->u.ipv4.min != min_ip || |
556 |
max_ip != acl->u.ipv4.max) |
557 |
continue; |
558 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
559 |
if (acl->u.ipv6.min != saved_min_address || |
560 |
saved_max_address != acl->u.ipv6.max) |
561 |
continue; |
562 |
} |
563 |
error = ccs_del_domain_acl(ptr); |
564 |
break; |
565 |
} |
566 |
out: |
567 |
mutex_unlock(&domain_acl_lock); |
568 |
return error; |
569 |
} |
570 |
|
571 |
/** |
572 |
* check_network_entry - Check permission for network operation. |
573 |
* |
574 |
* @is_ipv6: True if @address is an IPv6 address. |
575 |
* @operation: Type of operation. |
576 |
* @address: An IPv4 or IPv6 address. |
577 |
* @port: Port number. |
578 |
* |
579 |
* Returns 0 on success, negative value otherwise. |
580 |
*/ |
581 |
static int check_network_entry(const bool is_ipv6, const u8 operation, |
582 |
const u32 *address, const u16 port) |
583 |
{ |
584 |
struct ccs_request_info r; |
585 |
struct acl_info *ptr; |
586 |
const char *keyword = ccs_net2keyword(operation); |
587 |
bool is_enforce; |
588 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
589 |
const u32 ip = ntohl(*address); |
590 |
bool found = false; |
591 |
char buf[64]; |
592 |
if (!ccs_can_sleep()) |
593 |
return 0; |
594 |
ccs_init_request_info(&r, NULL, CCS_TOMOYO_MAC_FOR_NETWORK); |
595 |
is_enforce = (r.mode == 3); |
596 |
if (!r.mode) |
597 |
return 0; |
598 |
retry: |
599 |
list1_for_each_entry(ptr, &r.domain->acl_info_list, list) { |
600 |
struct ip_network_acl_record *acl; |
601 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
602 |
continue; |
603 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
604 |
if (acl->operation_type != operation || port < acl->min_port || |
605 |
acl->max_port < port || !ccs_check_condition(&r, ptr)) |
606 |
continue; |
607 |
if (acl->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
608 |
if (!address_matches_to_group(is_ipv6, address, |
609 |
acl->u.group)) |
610 |
continue; |
611 |
} else if (acl->record_type == IP_RECORD_TYPE_IPv4) { |
612 |
if (is_ipv6 || |
613 |
ip < acl->u.ipv4.min || acl->u.ipv4.max < ip) |
614 |
continue; |
615 |
} else { |
616 |
if (!is_ipv6 || |
617 |
memcmp(acl->u.ipv6.min, address, 16) > 0 || |
618 |
memcmp(address, acl->u.ipv6.max, 16) > 0) |
619 |
continue; |
620 |
} |
621 |
ccs_update_condition(ptr); |
622 |
found = true; |
623 |
break; |
624 |
} |
625 |
memset(buf, 0, sizeof(buf)); |
626 |
if (is_ipv6) |
627 |
ccs_print_ipv6(buf, sizeof(buf), |
628 |
(const struct in6_addr *) address); |
629 |
else |
630 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
631 |
audit_network_log(&r, keyword, buf, port, found); |
632 |
if (found) |
633 |
return 0; |
634 |
if (ccs_verbose_mode(r.domain)) |
635 |
printk(KERN_WARNING "TOMOYO-%s: %s to %s %u denied for %s\n", |
636 |
ccs_get_msg(is_enforce), keyword, buf, port, |
637 |
ccs_get_last_name(r.domain)); |
638 |
if (is_enforce) { |
639 |
int error = ccs_check_supervisor(&r, KEYWORD_ALLOW_NETWORK |
640 |
"%s %s %u\n", keyword, buf, |
641 |
port); |
642 |
if (error == 1) { |
643 |
r.retry++; |
644 |
goto retry; |
645 |
} |
646 |
return error; |
647 |
} |
648 |
if (r.mode == 1 && ccs_check_domain_quota(r.domain)) |
649 |
update_network_entry(operation, is_ipv6 ? |
650 |
IP_RECORD_TYPE_IPv6 : IP_RECORD_TYPE_IPv4, |
651 |
NULL, address, address, port, port, |
652 |
r.domain, NULL, 0); |
653 |
return 0; |
654 |
} |
655 |
|
656 |
/** |
657 |
* ccs_write_network_policy - Write "struct ip_network_acl_record" list. |
658 |
* |
659 |
* @data: String to parse. |
660 |
* @domain: Pointer to "struct domain_info". |
661 |
* @condition: Pointer to "struct condition_list". May be NULL. |
662 |
* @is_delete: True if it is a delete request. |
663 |
* |
664 |
* Returns 0 on success, negative value otherwise. |
665 |
*/ |
666 |
int ccs_write_network_policy(char *data, struct domain_info *domain, |
667 |
const struct condition_list *condition, |
668 |
const bool is_delete) |
669 |
{ |
670 |
u8 sock_type; |
671 |
u8 operation; |
672 |
u8 record_type; |
673 |
u16 min_address[8]; |
674 |
u16 max_address[8]; |
675 |
struct address_group_entry *group = NULL; |
676 |
u16 min_port; |
677 |
u16 max_port; |
678 |
u8 count; |
679 |
char *cp1 = strchr(data, ' '); |
680 |
char *cp2; |
681 |
if (!cp1) |
682 |
goto out; |
683 |
cp1++; |
684 |
if (!strncmp(data, "TCP ", 4)) |
685 |
sock_type = SOCK_STREAM; |
686 |
else if (!strncmp(data, "UDP ", 4)) |
687 |
sock_type = SOCK_DGRAM; |
688 |
else if (!strncmp(data, "RAW ", 4)) |
689 |
sock_type = SOCK_RAW; |
690 |
else |
691 |
goto out; |
692 |
cp2 = strchr(cp1, ' '); |
693 |
if (!cp2) |
694 |
goto out; |
695 |
cp2++; |
696 |
if (!strncmp(cp1, "bind ", 5)) |
697 |
switch (sock_type) { |
698 |
case SOCK_STREAM: |
699 |
operation = NETWORK_ACL_TCP_BIND; |
700 |
break; |
701 |
case SOCK_DGRAM: |
702 |
operation = NETWORK_ACL_UDP_BIND; |
703 |
break; |
704 |
default: |
705 |
operation = NETWORK_ACL_RAW_BIND; |
706 |
} |
707 |
else if (!strncmp(cp1, "connect ", 8)) |
708 |
switch (sock_type) { |
709 |
case SOCK_STREAM: |
710 |
operation = NETWORK_ACL_TCP_CONNECT; |
711 |
break; |
712 |
case SOCK_DGRAM: |
713 |
operation = NETWORK_ACL_UDP_CONNECT; |
714 |
break; |
715 |
default: |
716 |
operation = NETWORK_ACL_RAW_CONNECT; |
717 |
} |
718 |
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "listen ", 7)) |
719 |
operation = NETWORK_ACL_TCP_LISTEN; |
720 |
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "accept ", 7)) |
721 |
operation = NETWORK_ACL_TCP_ACCEPT; |
722 |
else |
723 |
goto out; |
724 |
cp1 = strchr(cp2, ' '); |
725 |
if (!cp1) |
726 |
goto out; |
727 |
*cp1++ = '\0'; |
728 |
switch (parse_ip_address(cp2, min_address, max_address)) { |
729 |
case 2: |
730 |
record_type = IP_RECORD_TYPE_IPv6; |
731 |
break; |
732 |
case 1: |
733 |
record_type = IP_RECORD_TYPE_IPv4; |
734 |
break; |
735 |
default: |
736 |
if (*cp2 != '@') |
737 |
goto out; |
738 |
group = find_or_assign_new_address_group(cp2 + 1); |
739 |
if (!group) |
740 |
return -ENOMEM; |
741 |
record_type = IP_RECORD_TYPE_ADDRESS_GROUP; |
742 |
break; |
743 |
} |
744 |
if (strchr(cp1, ' ')) |
745 |
goto out; |
746 |
count = sscanf(cp1, "%hu-%hu", &min_port, &max_port); |
747 |
if (count != 1 && count != 2) |
748 |
goto out; |
749 |
if (count == 1) |
750 |
max_port = min_port; |
751 |
return update_network_entry(operation, record_type, group, |
752 |
(u32 *) min_address, (u32 *) max_address, |
753 |
min_port, max_port, domain, condition, |
754 |
is_delete); |
755 |
out: |
756 |
return -EINVAL; |
757 |
} |
758 |
|
759 |
/** |
760 |
* ccs_check_network_listen_acl - Check permission for listen() operation. |
761 |
* |
762 |
* @is_ipv6: True if @address is an IPv6 address. |
763 |
* @address: An IPv4 or IPv6 address. |
764 |
* @port: Port number. |
765 |
* |
766 |
* Returns 0 on success, negative value otherwise. |
767 |
*/ |
768 |
int ccs_check_network_listen_acl(const _Bool is_ipv6, const u8 *address, |
769 |
const u16 port) |
770 |
{ |
771 |
return check_network_entry(is_ipv6, NETWORK_ACL_TCP_LISTEN, |
772 |
(const u32 *) address, ntohs(port)); |
773 |
} |
774 |
|
775 |
/** |
776 |
* ccs_check_network_connect_acl - Check permission for connect() operation. |
777 |
* |
778 |
* @is_ipv6: True if @address is an IPv6 address. |
779 |
* @sock_type: Type of socket. (TCP or UDP or RAW) |
780 |
* @address: An IPv4 or IPv6 address. |
781 |
* @port: Port number. |
782 |
* |
783 |
* Returns 0 on success, negative value otherwise. |
784 |
*/ |
785 |
int ccs_check_network_connect_acl(const _Bool is_ipv6, const int sock_type, |
786 |
const u8 *address, const u16 port) |
787 |
{ |
788 |
u8 operation; |
789 |
switch (sock_type) { |
790 |
case SOCK_STREAM: |
791 |
operation = NETWORK_ACL_TCP_CONNECT; |
792 |
break; |
793 |
case SOCK_DGRAM: |
794 |
operation = NETWORK_ACL_UDP_CONNECT; |
795 |
break; |
796 |
default: |
797 |
operation = NETWORK_ACL_RAW_CONNECT; |
798 |
} |
799 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
800 |
ntohs(port)); |
801 |
} |
802 |
|
803 |
/** |
804 |
* ccs_check_network_bind_acl - Check permission for bind() operation. |
805 |
* |
806 |
* @is_ipv6: True if @address is an IPv6 address. |
807 |
* @sock_type: Type of socket. (TCP or UDP or RAW) |
808 |
* @address: An IPv4 or IPv6 address. |
809 |
* @port: Port number. |
810 |
* |
811 |
* Returns 0 on success, negative value otherwise. |
812 |
*/ |
813 |
int ccs_check_network_bind_acl(const _Bool is_ipv6, const int sock_type, |
814 |
const u8 *address, const u16 port) |
815 |
{ |
816 |
u8 operation; |
817 |
switch (sock_type) { |
818 |
case SOCK_STREAM: |
819 |
operation = NETWORK_ACL_TCP_BIND; |
820 |
break; |
821 |
case SOCK_DGRAM: |
822 |
operation = NETWORK_ACL_UDP_BIND; |
823 |
break; |
824 |
default: |
825 |
operation = NETWORK_ACL_RAW_BIND; |
826 |
} |
827 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
828 |
ntohs(port)); |
829 |
} |
830 |
|
831 |
/** |
832 |
* ccs_check_network_accept_acl - Check permission for accept() operation. |
833 |
* |
834 |
* @is_ipv6: True if @address is an IPv6 address. |
835 |
* @address: An IPv4 or IPv6 address. |
836 |
* @port: Port number. |
837 |
* |
838 |
* Returns 0 on success, negative value otherwise. |
839 |
*/ |
840 |
int ccs_check_network_accept_acl(const _Bool is_ipv6, const u8 *address, |
841 |
const u16 port) |
842 |
{ |
843 |
int retval; |
844 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
845 |
retval = check_network_entry(is_ipv6, NETWORK_ACL_TCP_ACCEPT, |
846 |
(const u32 *) address, ntohs(port)); |
847 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
848 |
return retval; |
849 |
} |
850 |
|
851 |
/** |
852 |
* ccs_check_network_sendmsg_acl - Check permission for sendmsg() operation. |
853 |
* |
854 |
* @is_ipv6: True if @address is an IPv6 address. |
855 |
* @sock_type: Type of socket. (UDP or RAW) |
856 |
* @address: An IPv4 or IPv6 address. |
857 |
* @port: Port number. |
858 |
* |
859 |
* Returns 0 on success, negative value otherwise. |
860 |
*/ |
861 |
int ccs_check_network_sendmsg_acl(const _Bool is_ipv6, const int sock_type, |
862 |
const u8 *address, const u16 port) |
863 |
{ |
864 |
u8 operation; |
865 |
if (sock_type == SOCK_DGRAM) |
866 |
operation = NETWORK_ACL_UDP_CONNECT; |
867 |
else |
868 |
operation = NETWORK_ACL_RAW_CONNECT; |
869 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
870 |
ntohs(port)); |
871 |
} |
872 |
|
873 |
/** |
874 |
* ccs_check_network_recvmsg_acl - Check permission for recvmsg() operation. |
875 |
* |
876 |
* @is_ipv6: True if @address is an IPv6 address. |
877 |
* @sock_type: Type of socket. (UDP or RAW) |
878 |
* @address: An IPv4 or IPv6 address. |
879 |
* @port: Port number. |
880 |
* |
881 |
* Returns 0 on success, negative value otherwise. |
882 |
*/ |
883 |
int ccs_check_network_recvmsg_acl(const _Bool is_ipv6, const int sock_type, |
884 |
const u8 *address, const u16 port) |
885 |
{ |
886 |
int retval; |
887 |
const u8 operation |
888 |
= (sock_type == SOCK_DGRAM) ? |
889 |
NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT; |
890 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
891 |
retval = check_network_entry(is_ipv6, operation, (const u32 *) address, |
892 |
ntohs(port)); |
893 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
894 |
return retval; |
895 |
} |