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-rc 2008/11/07 |
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 |
u32 ip = htonl((((u8) min[0]) << 24) + (((u8) min[1]) << 16) |
221 |
+ (((u8) min[2]) << 8) + (u8) min[3]); |
222 |
memmove(min, &ip, sizeof(ip)); |
223 |
if (count == 8) |
224 |
ip = htonl((((u8) max[0]) << 24) + (((u8) max[1]) << 16) |
225 |
+ (((u8) max[2]) << 8) + (u8) max[3]); |
226 |
memmove(max, &ip, sizeof(ip)); |
227 |
return 1; |
228 |
} |
229 |
return 0; |
230 |
} |
231 |
|
232 |
/** |
233 |
* ccs_write_address_group_policy - Write "struct address_group_entry" list. |
234 |
* |
235 |
* @data: String to parse. |
236 |
* @is_delete: True if it is a delete request. |
237 |
* |
238 |
* Returns 0 on success, negative value otherwise. |
239 |
*/ |
240 |
int ccs_write_address_group_policy(char *data, const bool is_delete) |
241 |
{ |
242 |
bool is_ipv6; |
243 |
u16 min_address[8]; |
244 |
u16 max_address[8]; |
245 |
char *cp = strchr(data, ' '); |
246 |
if (!cp) |
247 |
return -EINVAL; |
248 |
*cp++ = '\0'; |
249 |
switch (parse_ip_address(cp, min_address, max_address)) { |
250 |
case 2: |
251 |
is_ipv6 = true; |
252 |
break; |
253 |
case 1: |
254 |
is_ipv6 = false; |
255 |
break; |
256 |
default: |
257 |
return -EINVAL; |
258 |
} |
259 |
return update_address_group_entry(data, is_ipv6, |
260 |
min_address, max_address, is_delete); |
261 |
} |
262 |
|
263 |
/** |
264 |
* find_or_assign_new_address_group - Create address group. |
265 |
* |
266 |
* @group_name: The name of address group. |
267 |
* |
268 |
* Returns pointer to "struct address_group_entry" on success, NULL otherwise. |
269 |
*/ |
270 |
static struct address_group_entry * |
271 |
find_or_assign_new_address_group(const char *group_name) |
272 |
{ |
273 |
u8 i; |
274 |
struct address_group_entry *group; |
275 |
for (i = 0; i <= 1; i++) { |
276 |
list1_for_each_entry(group, &address_group_list, list) { |
277 |
if (!strcmp(group_name, group->group_name->name)) |
278 |
return group; |
279 |
} |
280 |
if (!i) { |
281 |
const u16 dummy[2] = { 0, 0 }; |
282 |
update_address_group_entry(group_name, false, |
283 |
dummy, dummy, false); |
284 |
update_address_group_entry(group_name, false, |
285 |
dummy, dummy, true); |
286 |
} |
287 |
} |
288 |
return NULL; |
289 |
} |
290 |
|
291 |
/** |
292 |
* address_matches_to_group - Check whether the given address matches members of the given address group. |
293 |
* |
294 |
* @is_ipv6: True if @address is an IPv6 address. |
295 |
* @address: An IPv4 or IPv6 address. |
296 |
* @group: Pointer to "struct address_group_entry". |
297 |
* |
298 |
* Returns true if @address matches addresses in @group group, false otherwise. |
299 |
*/ |
300 |
static bool address_matches_to_group(const bool is_ipv6, const u32 *address, |
301 |
const struct address_group_entry *group) |
302 |
{ |
303 |
struct address_group_member *member; |
304 |
const u32 ip = ntohl(*address); |
305 |
list1_for_each_entry(member, &group->address_group_member_list, list) { |
306 |
if (member->is_deleted) |
307 |
continue; |
308 |
if (member->is_ipv6) { |
309 |
if (is_ipv6 && |
310 |
memcmp(member->min.ipv6, address, 16) <= 0 && |
311 |
memcmp(address, member->max.ipv6, 16) <= 0) |
312 |
return true; |
313 |
} else { |
314 |
if (!is_ipv6 && |
315 |
member->min.ipv4 <= ip && ip <= member->max.ipv4) |
316 |
return true; |
317 |
} |
318 |
} |
319 |
return false; |
320 |
} |
321 |
|
322 |
/** |
323 |
* ccs_read_address_group_policy - Read "struct address_group_entry" list. |
324 |
* |
325 |
* @head: Pointer to "struct ccs_io_buffer". |
326 |
* |
327 |
* Returns true on success, false otherwise. |
328 |
*/ |
329 |
bool ccs_read_address_group_policy(struct ccs_io_buffer *head) |
330 |
{ |
331 |
struct list1_head *gpos; |
332 |
struct list1_head *mpos; |
333 |
list1_for_each_cookie(gpos, head->read_var1, &address_group_list) { |
334 |
struct address_group_entry *group; |
335 |
group = list1_entry(gpos, struct address_group_entry, list); |
336 |
list1_for_each_cookie(mpos, head->read_var2, |
337 |
&group->address_group_member_list) { |
338 |
char buf[128]; |
339 |
struct address_group_member *member; |
340 |
member = list1_entry(mpos, struct address_group_member, |
341 |
list); |
342 |
if (member->is_deleted) |
343 |
continue; |
344 |
if (member->is_ipv6) { |
345 |
const struct in6_addr *min_address |
346 |
= member->min.ipv6; |
347 |
const struct in6_addr *max_address |
348 |
= member->max.ipv6; |
349 |
ccs_print_ipv6(buf, sizeof(buf), min_address); |
350 |
if (min_address != max_address) { |
351 |
int len; |
352 |
char *cp = buf + strlen(buf); |
353 |
*cp++ = '-'; |
354 |
len = strlen(buf); |
355 |
ccs_print_ipv6(cp, sizeof(buf) - len, |
356 |
max_address); |
357 |
} |
358 |
} else { |
359 |
const u32 min_address = member->min.ipv4; |
360 |
const u32 max_address = member->max.ipv4; |
361 |
memset(buf, 0, sizeof(buf)); |
362 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", |
363 |
HIPQUAD(min_address)); |
364 |
if (min_address != max_address) { |
365 |
const int len = strlen(buf); |
366 |
snprintf(buf + len, |
367 |
sizeof(buf) - 1 - len, |
368 |
"-%u.%u.%u.%u", |
369 |
HIPQUAD(max_address)); |
370 |
} |
371 |
} |
372 |
if (!ccs_io_printf(head, KEYWORD_ADDRESS_GROUP |
373 |
"%s %s\n", group->group_name->name, |
374 |
buf)) |
375 |
goto out; |
376 |
} |
377 |
} |
378 |
return true; |
379 |
out: |
380 |
return false; |
381 |
} |
382 |
|
383 |
#if !defined(NIP6) |
384 |
#define NIP6(addr) \ |
385 |
ntohs((addr).s6_addr16[0]), ntohs((addr).s6_addr16[1]), \ |
386 |
ntohs((addr).s6_addr16[2]), ntohs((addr).s6_addr16[3]), \ |
387 |
ntohs((addr).s6_addr16[4]), ntohs((addr).s6_addr16[5]), \ |
388 |
ntohs((addr).s6_addr16[6]), ntohs((addr).s6_addr16[7]) |
389 |
#endif |
390 |
|
391 |
/** |
392 |
* ccs_print_ipv6 - Print an IPv6 address. |
393 |
* |
394 |
* @buffer: Buffer to write to. |
395 |
* @buffer_len: Size of @buffer. |
396 |
* @ip: Pointer to "struct in6_addr". |
397 |
* |
398 |
* Returns nothing. |
399 |
*/ |
400 |
void ccs_print_ipv6(char *buffer, const int buffer_len, |
401 |
const struct in6_addr *ip) |
402 |
{ |
403 |
memset(buffer, 0, buffer_len); |
404 |
snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip)); |
405 |
} |
406 |
|
407 |
/** |
408 |
* ccs_net2keyword - Convert network operation index to network operation name. |
409 |
* |
410 |
* @operation: Type of operation. |
411 |
* |
412 |
* Returns the name of operation. |
413 |
*/ |
414 |
const char *ccs_net2keyword(const u8 operation) |
415 |
{ |
416 |
const char *keyword = "unknown"; |
417 |
switch (operation) { |
418 |
case NETWORK_ACL_UDP_BIND: |
419 |
keyword = "UDP bind"; |
420 |
break; |
421 |
case NETWORK_ACL_UDP_CONNECT: |
422 |
keyword = "UDP connect"; |
423 |
break; |
424 |
case NETWORK_ACL_TCP_BIND: |
425 |
keyword = "TCP bind"; |
426 |
break; |
427 |
case NETWORK_ACL_TCP_LISTEN: |
428 |
keyword = "TCP listen"; |
429 |
break; |
430 |
case NETWORK_ACL_TCP_CONNECT: |
431 |
keyword = "TCP connect"; |
432 |
break; |
433 |
case NETWORK_ACL_TCP_ACCEPT: |
434 |
keyword = "TCP accept"; |
435 |
break; |
436 |
case NETWORK_ACL_RAW_BIND: |
437 |
keyword = "RAW bind"; |
438 |
break; |
439 |
case NETWORK_ACL_RAW_CONNECT: |
440 |
keyword = "RAW connect"; |
441 |
break; |
442 |
} |
443 |
return keyword; |
444 |
} |
445 |
|
446 |
/** |
447 |
* update_network_entry - Update "struct ip_network_acl_record" list. |
448 |
* |
449 |
* @operation: Type of operation. |
450 |
* @record_type: Type of address. |
451 |
* @group: Pointer to "struct address_group_entry". May be NULL. |
452 |
* @min_address: Start of IPv4 or IPv6 address range. |
453 |
* @max_address: End of IPv4 or IPv6 address range. |
454 |
* @min_port: Start of port number range. |
455 |
* @max_port: End of port number range. |
456 |
* @domain: Pointer to "struct domain_info". |
457 |
* @condition: Pointer to "struct condition_list". May be NULL. |
458 |
* @is_delete: True if it is a delete request. |
459 |
* |
460 |
* Returns 0 on success, negative value otherwise. |
461 |
*/ |
462 |
static int update_network_entry(const u8 operation, const u8 record_type, |
463 |
const struct address_group_entry *group, |
464 |
const u32 *min_address, const u32 *max_address, |
465 |
const u16 min_port, const u16 max_port, |
466 |
struct domain_info *domain, |
467 |
const struct condition_list *condition, |
468 |
const bool is_delete) |
469 |
{ |
470 |
static DEFINE_MUTEX(lock); |
471 |
struct acl_info *ptr; |
472 |
struct ip_network_acl_record *acl; |
473 |
int error = -ENOMEM; |
474 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
475 |
const u32 min_ip = ntohl(*min_address); |
476 |
const u32 max_ip = ntohl(*max_address); |
477 |
const struct in6_addr *saved_min_address = NULL; |
478 |
const struct in6_addr *saved_max_address = NULL; |
479 |
if (!domain) |
480 |
return -EINVAL; |
481 |
if (record_type != IP_RECORD_TYPE_IPv6) |
482 |
goto not_ipv6; |
483 |
saved_min_address = save_ipv6_address((struct in6_addr *) min_address); |
484 |
saved_max_address = save_ipv6_address((struct in6_addr *) max_address); |
485 |
if (!saved_min_address || !saved_max_address) |
486 |
return -ENOMEM; |
487 |
not_ipv6: |
488 |
mutex_lock(&lock); |
489 |
if (is_delete) |
490 |
goto delete; |
491 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
492 |
if (ccs_acl_type1(ptr) != TYPE_IP_NETWORK_ACL) |
493 |
continue; |
494 |
if (ccs_get_condition_part(ptr) != condition) |
495 |
continue; |
496 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
497 |
if (acl->operation_type != operation || |
498 |
acl->record_type != record_type || |
499 |
acl->min_port != min_port || max_port != acl->max_port) |
500 |
continue; |
501 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
502 |
if (acl->u.group != group) |
503 |
continue; |
504 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
505 |
if (acl->u.ipv4.min != min_ip || |
506 |
max_ip != acl->u.ipv4.max) |
507 |
continue; |
508 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
509 |
if (acl->u.ipv6.min != saved_min_address || |
510 |
saved_max_address != acl->u.ipv6.max) |
511 |
continue; |
512 |
} |
513 |
error = ccs_add_domain_acl(NULL, ptr); |
514 |
goto out; |
515 |
} |
516 |
/* Not found. Append it to the tail. */ |
517 |
acl = ccs_alloc_acl_element(TYPE_IP_NETWORK_ACL, condition); |
518 |
if (!acl) |
519 |
goto out; |
520 |
acl->operation_type = operation; |
521 |
acl->record_type = record_type; |
522 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
523 |
acl->u.group = group; |
524 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
525 |
acl->u.ipv4.min = min_ip; |
526 |
acl->u.ipv4.max = max_ip; |
527 |
} else { |
528 |
acl->u.ipv6.min = saved_min_address; |
529 |
acl->u.ipv6.max = saved_max_address; |
530 |
} |
531 |
acl->min_port = min_port; |
532 |
acl->max_port = max_port; |
533 |
error = ccs_add_domain_acl(domain, &acl->head); |
534 |
goto out; |
535 |
delete: |
536 |
error = -ENOENT; |
537 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
538 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
539 |
continue; |
540 |
if (ccs_get_condition_part(ptr) != condition) |
541 |
continue; |
542 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
543 |
if (acl->operation_type != operation || |
544 |
acl->record_type != record_type || |
545 |
acl->min_port != min_port || max_port != acl->max_port) |
546 |
continue; |
547 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
548 |
if (acl->u.group != group) |
549 |
continue; |
550 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
551 |
if (acl->u.ipv4.min != min_ip || |
552 |
max_ip != acl->u.ipv4.max) |
553 |
continue; |
554 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
555 |
if (acl->u.ipv6.min != saved_min_address || |
556 |
saved_max_address != acl->u.ipv6.max) |
557 |
continue; |
558 |
} |
559 |
error = ccs_del_domain_acl(ptr); |
560 |
break; |
561 |
} |
562 |
out: |
563 |
mutex_unlock(&lock); |
564 |
return error; |
565 |
} |
566 |
|
567 |
/** |
568 |
* check_network_entry - Check permission for network operation. |
569 |
* |
570 |
* @is_ipv6: True if @address is an IPv6 address. |
571 |
* @operation: Type of operation. |
572 |
* @address: An IPv4 or IPv6 address. |
573 |
* @port: Port number. |
574 |
* |
575 |
* Returns 0 on success, negative value otherwise. |
576 |
*/ |
577 |
static int check_network_entry(const bool is_ipv6, const u8 operation, |
578 |
const u32 *address, const u16 port) |
579 |
{ |
580 |
struct ccs_request_info r; |
581 |
struct acl_info *ptr; |
582 |
const char *keyword = ccs_net2keyword(operation); |
583 |
bool is_enforce; |
584 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
585 |
const u32 ip = ntohl(*address); |
586 |
bool found = false; |
587 |
char buf[64]; |
588 |
if (!ccs_can_sleep()) |
589 |
return 0; |
590 |
ccs_init_request_info(&r, NULL, CCS_TOMOYO_MAC_FOR_NETWORK); |
591 |
is_enforce = (r.mode == 3); |
592 |
if (!r.mode) |
593 |
return 0; |
594 |
retry: |
595 |
list1_for_each_entry(ptr, &r.domain->acl_info_list, list) { |
596 |
struct ip_network_acl_record *acl; |
597 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
598 |
continue; |
599 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
600 |
if (acl->operation_type != operation || port < acl->min_port || |
601 |
acl->max_port < port || !ccs_check_condition(&r, ptr)) |
602 |
continue; |
603 |
if (acl->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
604 |
if (!address_matches_to_group(is_ipv6, address, |
605 |
acl->u.group)) |
606 |
continue; |
607 |
} else if (acl->record_type == IP_RECORD_TYPE_IPv4) { |
608 |
if (is_ipv6 || |
609 |
ip < acl->u.ipv4.min || acl->u.ipv4.max < ip) |
610 |
continue; |
611 |
} else { |
612 |
if (!is_ipv6 || |
613 |
memcmp(acl->u.ipv6.min, address, 16) > 0 || |
614 |
memcmp(address, acl->u.ipv6.max, 16) > 0) |
615 |
continue; |
616 |
} |
617 |
r.cond = ccs_get_condition_part(ptr); |
618 |
found = true; |
619 |
break; |
620 |
} |
621 |
memset(buf, 0, sizeof(buf)); |
622 |
if (is_ipv6) |
623 |
ccs_print_ipv6(buf, sizeof(buf), |
624 |
(const struct in6_addr *) address); |
625 |
else |
626 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
627 |
audit_network_log(&r, keyword, buf, port, found); |
628 |
if (found) |
629 |
return 0; |
630 |
if (ccs_verbose_mode(r.domain)) |
631 |
printk(KERN_WARNING "TOMOYO-%s: %s to %s %u denied for %s\n", |
632 |
ccs_get_msg(is_enforce), keyword, buf, port, |
633 |
ccs_get_last_name(r.domain)); |
634 |
if (is_enforce) { |
635 |
int error = ccs_check_supervisor(&r, KEYWORD_ALLOW_NETWORK |
636 |
"%s %s %u\n", keyword, buf, |
637 |
port); |
638 |
if (error == 1) |
639 |
goto retry; |
640 |
return error; |
641 |
} |
642 |
if (r.mode == 1 && ccs_check_domain_quota(r.domain)) |
643 |
update_network_entry(operation, is_ipv6 ? |
644 |
IP_RECORD_TYPE_IPv6 : IP_RECORD_TYPE_IPv4, |
645 |
NULL, address, address, port, port, |
646 |
r.domain, NULL, 0); |
647 |
return 0; |
648 |
} |
649 |
|
650 |
/** |
651 |
* ccs_write_network_policy - Write "struct ip_network_acl_record" list. |
652 |
* |
653 |
* @data: String to parse. |
654 |
* @domain: Pointer to "struct domain_info". |
655 |
* @condition: Pointer to "struct condition_list". May be NULL. |
656 |
* @is_delete: True if it is a delete request. |
657 |
* |
658 |
* Returns 0 on success, negative value otherwise. |
659 |
*/ |
660 |
int ccs_write_network_policy(char *data, struct domain_info *domain, |
661 |
const struct condition_list *condition, |
662 |
const bool is_delete) |
663 |
{ |
664 |
u8 sock_type; |
665 |
u8 operation; |
666 |
u8 record_type; |
667 |
u16 min_address[8]; |
668 |
u16 max_address[8]; |
669 |
struct address_group_entry *group = NULL; |
670 |
u16 min_port; |
671 |
u16 max_port; |
672 |
u8 count; |
673 |
char *cp1 = strchr(data, ' '); |
674 |
char *cp2; |
675 |
if (!cp1) |
676 |
goto out; |
677 |
cp1++; |
678 |
if (!strncmp(data, "TCP ", 4)) |
679 |
sock_type = SOCK_STREAM; |
680 |
else if (!strncmp(data, "UDP ", 4)) |
681 |
sock_type = SOCK_DGRAM; |
682 |
else if (!strncmp(data, "RAW ", 4)) |
683 |
sock_type = SOCK_RAW; |
684 |
else |
685 |
goto out; |
686 |
cp2 = strchr(cp1, ' '); |
687 |
if (!cp2) |
688 |
goto out; |
689 |
cp2++; |
690 |
if (!strncmp(cp1, "bind ", 5)) |
691 |
switch (sock_type) { |
692 |
case SOCK_STREAM: |
693 |
operation = NETWORK_ACL_TCP_BIND; |
694 |
break; |
695 |
case SOCK_DGRAM: |
696 |
operation = NETWORK_ACL_UDP_BIND; |
697 |
break; |
698 |
default: |
699 |
operation = NETWORK_ACL_RAW_BIND; |
700 |
} |
701 |
else if (!strncmp(cp1, "connect ", 8)) |
702 |
switch (sock_type) { |
703 |
case SOCK_STREAM: |
704 |
operation = NETWORK_ACL_TCP_CONNECT; |
705 |
break; |
706 |
case SOCK_DGRAM: |
707 |
operation = NETWORK_ACL_UDP_CONNECT; |
708 |
break; |
709 |
default: |
710 |
operation = NETWORK_ACL_RAW_CONNECT; |
711 |
} |
712 |
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "listen ", 7)) |
713 |
operation = NETWORK_ACL_TCP_LISTEN; |
714 |
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "accept ", 7)) |
715 |
operation = NETWORK_ACL_TCP_ACCEPT; |
716 |
else |
717 |
goto out; |
718 |
cp1 = strchr(cp2, ' '); |
719 |
if (!cp1) |
720 |
goto out; |
721 |
*cp1++ = '\0'; |
722 |
switch (parse_ip_address(cp2, min_address, max_address)) { |
723 |
case 2: |
724 |
record_type = IP_RECORD_TYPE_IPv6; |
725 |
break; |
726 |
case 1: |
727 |
record_type = IP_RECORD_TYPE_IPv4; |
728 |
break; |
729 |
default: |
730 |
if (*cp2 != '@') |
731 |
goto out; |
732 |
group = find_or_assign_new_address_group(cp2 + 1); |
733 |
if (!group) |
734 |
return -ENOMEM; |
735 |
record_type = IP_RECORD_TYPE_ADDRESS_GROUP; |
736 |
break; |
737 |
} |
738 |
if (strchr(cp1, ' ')) |
739 |
goto out; |
740 |
count = sscanf(cp1, "%hu-%hu", &min_port, &max_port); |
741 |
if (count != 1 && count != 2) |
742 |
goto out; |
743 |
if (count == 1) |
744 |
max_port = min_port; |
745 |
return update_network_entry(operation, record_type, group, |
746 |
(u32 *) min_address, (u32 *) max_address, |
747 |
min_port, max_port, domain, condition, |
748 |
is_delete); |
749 |
out: |
750 |
return -EINVAL; |
751 |
} |
752 |
|
753 |
/** |
754 |
* ccs_check_network_listen_acl - Check permission for listen() operation. |
755 |
* |
756 |
* @is_ipv6: True if @address is an IPv6 address. |
757 |
* @address: An IPv4 or IPv6 address. |
758 |
* @port: Port number. |
759 |
* |
760 |
* Returns 0 on success, negative value otherwise. |
761 |
*/ |
762 |
int ccs_check_network_listen_acl(const _Bool is_ipv6, const u8 *address, |
763 |
const u16 port) |
764 |
{ |
765 |
return check_network_entry(is_ipv6, NETWORK_ACL_TCP_LISTEN, |
766 |
(const u32 *) address, ntohs(port)); |
767 |
} |
768 |
|
769 |
/** |
770 |
* ccs_check_network_connect_acl - Check permission for connect() operation. |
771 |
* |
772 |
* @is_ipv6: True if @address is an IPv6 address. |
773 |
* @sock_type: Type of socket. (TCP or UDP or RAW) |
774 |
* @address: An IPv4 or IPv6 address. |
775 |
* @port: Port number. |
776 |
* |
777 |
* Returns 0 on success, negative value otherwise. |
778 |
*/ |
779 |
int ccs_check_network_connect_acl(const _Bool is_ipv6, const int sock_type, |
780 |
const u8 *address, const u16 port) |
781 |
{ |
782 |
u8 operation; |
783 |
switch (sock_type) { |
784 |
case SOCK_STREAM: |
785 |
operation = NETWORK_ACL_TCP_CONNECT; |
786 |
break; |
787 |
case SOCK_DGRAM: |
788 |
operation = NETWORK_ACL_UDP_CONNECT; |
789 |
break; |
790 |
default: |
791 |
operation = NETWORK_ACL_RAW_CONNECT; |
792 |
} |
793 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
794 |
ntohs(port)); |
795 |
} |
796 |
|
797 |
/** |
798 |
* ccs_check_network_bind_acl - Check permission for bind() operation. |
799 |
* |
800 |
* @is_ipv6: True if @address is an IPv6 address. |
801 |
* @sock_type: Type of socket. (TCP or UDP or RAW) |
802 |
* @address: An IPv4 or IPv6 address. |
803 |
* @port: Port number. |
804 |
* |
805 |
* Returns 0 on success, negative value otherwise. |
806 |
*/ |
807 |
int ccs_check_network_bind_acl(const _Bool is_ipv6, const int sock_type, |
808 |
const u8 *address, const u16 port) |
809 |
{ |
810 |
u8 operation; |
811 |
switch (sock_type) { |
812 |
case SOCK_STREAM: |
813 |
operation = NETWORK_ACL_TCP_BIND; |
814 |
break; |
815 |
case SOCK_DGRAM: |
816 |
operation = NETWORK_ACL_UDP_BIND; |
817 |
break; |
818 |
default: |
819 |
operation = NETWORK_ACL_RAW_BIND; |
820 |
} |
821 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
822 |
ntohs(port)); |
823 |
} |
824 |
|
825 |
/** |
826 |
* ccs_check_network_accept_acl - Check permission for accept() operation. |
827 |
* |
828 |
* @is_ipv6: True if @address is an IPv6 address. |
829 |
* @address: An IPv4 or IPv6 address. |
830 |
* @port: Port number. |
831 |
* |
832 |
* Returns 0 on success, negative value otherwise. |
833 |
*/ |
834 |
int ccs_check_network_accept_acl(const _Bool is_ipv6, const u8 *address, |
835 |
const u16 port) |
836 |
{ |
837 |
int retval; |
838 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
839 |
retval = check_network_entry(is_ipv6, NETWORK_ACL_TCP_ACCEPT, |
840 |
(const u32 *) address, ntohs(port)); |
841 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
842 |
return retval; |
843 |
} |
844 |
|
845 |
/** |
846 |
* ccs_check_network_sendmsg_acl - Check permission for sendmsg() operation. |
847 |
* |
848 |
* @is_ipv6: True if @address is an IPv6 address. |
849 |
* @sock_type: Type of socket. (UDP or RAW) |
850 |
* @address: An IPv4 or IPv6 address. |
851 |
* @port: Port number. |
852 |
* |
853 |
* Returns 0 on success, negative value otherwise. |
854 |
*/ |
855 |
int ccs_check_network_sendmsg_acl(const _Bool is_ipv6, const int sock_type, |
856 |
const u8 *address, const u16 port) |
857 |
{ |
858 |
u8 operation; |
859 |
if (sock_type == SOCK_DGRAM) |
860 |
operation = NETWORK_ACL_UDP_CONNECT; |
861 |
else |
862 |
operation = NETWORK_ACL_RAW_CONNECT; |
863 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
864 |
ntohs(port)); |
865 |
} |
866 |
|
867 |
/** |
868 |
* ccs_check_network_recvmsg_acl - Check permission for recvmsg() operation. |
869 |
* |
870 |
* @is_ipv6: True if @address is an IPv6 address. |
871 |
* @sock_type: Type of socket. (UDP or RAW) |
872 |
* @address: An IPv4 or IPv6 address. |
873 |
* @port: Port number. |
874 |
* |
875 |
* Returns 0 on success, negative value otherwise. |
876 |
*/ |
877 |
int ccs_check_network_recvmsg_acl(const _Bool is_ipv6, const int sock_type, |
878 |
const u8 *address, const u16 port) |
879 |
{ |
880 |
int retval; |
881 |
const u8 operation |
882 |
= (sock_type == SOCK_DGRAM) ? |
883 |
NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT; |
884 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
885 |
retval = check_network_entry(is_ipv6, operation, (const u32 *) address, |
886 |
ntohs(port)); |
887 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
888 |
return retval; |
889 |
} |