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 2008/10/01 |
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 |
* @is_ipv6: True if @address is an IPv6 address. |
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 |
* @profile: Profile number used. |
32 |
* @mode: Access control mode used. |
33 |
* |
34 |
* Returns 0 on success, negative value otherwise. |
35 |
*/ |
36 |
static int audit_network_log(const bool is_ipv6, const char *operation, |
37 |
const char *address, const u16 port, |
38 |
const bool is_granted, |
39 |
const u8 profile, const u8 mode) |
40 |
{ |
41 |
char *buf; |
42 |
int len = 256; |
43 |
int len2; |
44 |
if (ccs_can_save_audit_log(is_granted) < 0) |
45 |
return -ENOMEM; |
46 |
buf = ccs_init_audit_log(&len, profile, mode, NULL); |
47 |
if (!buf) |
48 |
return -ENOMEM; |
49 |
len2 = strlen(buf); |
50 |
snprintf(buf + len2, len - len2 - 1, KEYWORD_ALLOW_NETWORK "%s %s %u\n", |
51 |
operation, address, port); |
52 |
return ccs_write_audit_log(buf, is_granted); |
53 |
} |
54 |
|
55 |
/** |
56 |
* save_ipv6_address - Keep the given IPv6 address on the RAM. |
57 |
* |
58 |
* @addr: Pointer to "struct in6_addr". |
59 |
* |
60 |
* Returns pointer to "struct in6_addr" on success, NULL otherwise. |
61 |
* |
62 |
* The RAM is shared, so NEVER try to modify or kfree() the returned address. |
63 |
*/ |
64 |
static const struct in6_addr *save_ipv6_address(const struct in6_addr *addr) |
65 |
{ |
66 |
static const u8 block_size = 16; |
67 |
struct addr_list { |
68 |
/* Workaround for gcc 4.3's bug. */ |
69 |
struct in6_addr addr[16]; /* = block_size */ |
70 |
struct list1_head list; |
71 |
u32 in_use_count; |
72 |
}; |
73 |
static LIST1_HEAD(address_list); |
74 |
struct addr_list *ptr; |
75 |
static DEFINE_MUTEX(lock); |
76 |
u8 i = block_size; |
77 |
if (!addr) |
78 |
return NULL; |
79 |
mutex_lock(&lock); |
80 |
list1_for_each_entry(ptr, &address_list, list) { |
81 |
for (i = 0; i < ptr->in_use_count; i++) { |
82 |
if (!memcmp(&ptr->addr[i], addr, sizeof(*addr))) |
83 |
goto ok; |
84 |
} |
85 |
if (i < block_size) |
86 |
break; |
87 |
} |
88 |
if (i == block_size) { |
89 |
ptr = ccs_alloc_element(sizeof(*ptr)); |
90 |
if (!ptr) |
91 |
goto ok; |
92 |
list1_add_tail_mb(&ptr->list, &address_list); |
93 |
i = 0; |
94 |
} |
95 |
ptr->addr[ptr->in_use_count++] = *addr; |
96 |
ok: |
97 |
mutex_unlock(&lock); |
98 |
return ptr ? &ptr->addr[i] : NULL; |
99 |
} |
100 |
|
101 |
/* The list for "struct address_group_entry". */ |
102 |
static LIST1_HEAD(address_group_list); |
103 |
|
104 |
/** |
105 |
* update_address_group_entry - Update "struct address_group_entry" list. |
106 |
* |
107 |
* @group_name: The name of address group. |
108 |
* @is_ipv6: True if @min_address and @max_address are IPv6 addresses. |
109 |
* @min_address: Start of IPv4 or IPv6 address range. |
110 |
* @max_address: End of IPv4 or IPv6 address range. |
111 |
* @is_delete: True if it is a delete request. |
112 |
* |
113 |
* Returns 0 on success, negative value otherwise. |
114 |
*/ |
115 |
static int update_address_group_entry(const char *group_name, |
116 |
const bool is_ipv6, |
117 |
const u16 *min_address, |
118 |
const u16 *max_address, |
119 |
const bool is_delete) |
120 |
{ |
121 |
static DEFINE_MUTEX(lock); |
122 |
struct address_group_entry *new_group; |
123 |
struct address_group_entry *group; |
124 |
struct address_group_member *new_member; |
125 |
struct address_group_member *member; |
126 |
const struct path_info *saved_group_name; |
127 |
const struct in6_addr *saved_min_address = NULL; |
128 |
const struct in6_addr *saved_max_address = NULL; |
129 |
int error = -ENOMEM; |
130 |
bool found = false; |
131 |
if (!ccs_is_correct_path(group_name, 0, 0, 0, __func__) || |
132 |
!group_name[0]) |
133 |
return -EINVAL; |
134 |
saved_group_name = ccs_save_name(group_name); |
135 |
if (!saved_group_name) |
136 |
return -ENOMEM; |
137 |
if (!is_ipv6) |
138 |
goto not_ipv6; |
139 |
saved_min_address |
140 |
= save_ipv6_address((struct in6_addr *) min_address); |
141 |
saved_max_address |
142 |
= save_ipv6_address((struct in6_addr *) max_address); |
143 |
if (!saved_min_address || !saved_max_address) |
144 |
return -ENOMEM; |
145 |
not_ipv6: |
146 |
mutex_lock(&lock); |
147 |
list1_for_each_entry(group, &address_group_list, list) { |
148 |
if (saved_group_name != group->group_name) |
149 |
continue; |
150 |
list1_for_each_entry(member, &group->address_group_member_list, |
151 |
list) { |
152 |
if (member->is_ipv6 != is_ipv6) |
153 |
continue; |
154 |
if (is_ipv6) { |
155 |
if (member->min.ipv6 != saved_min_address || |
156 |
member->max.ipv6 != saved_max_address) |
157 |
continue; |
158 |
} else { |
159 |
if (member->min.ipv4 != *(u32 *) min_address || |
160 |
member->max.ipv4 != *(u32 *) max_address) |
161 |
continue; |
162 |
} |
163 |
member->is_deleted = is_delete; |
164 |
error = 0; |
165 |
goto out; |
166 |
} |
167 |
found = true; |
168 |
break; |
169 |
} |
170 |
if (is_delete) { |
171 |
error = -ENOENT; |
172 |
goto out; |
173 |
} |
174 |
if (!found) { |
175 |
new_group = ccs_alloc_element(sizeof(*new_group)); |
176 |
if (!new_group) |
177 |
goto out; |
178 |
INIT_LIST1_HEAD(&new_group->address_group_member_list); |
179 |
new_group->group_name = saved_group_name; |
180 |
list1_add_tail_mb(&new_group->list, &address_group_list); |
181 |
group = new_group; |
182 |
} |
183 |
new_member = ccs_alloc_element(sizeof(*new_member)); |
184 |
if (!new_member) |
185 |
goto out; |
186 |
new_member->is_ipv6 = is_ipv6; |
187 |
if (is_ipv6) { |
188 |
new_member->min.ipv6 = saved_min_address; |
189 |
new_member->max.ipv6 = saved_max_address; |
190 |
} else { |
191 |
new_member->min.ipv4 = *(u32 *) min_address; |
192 |
new_member->max.ipv4 = *(u32 *) max_address; |
193 |
} |
194 |
list1_add_tail_mb(&new_member->list, &group->address_group_member_list); |
195 |
error = 0; |
196 |
out: |
197 |
mutex_unlock(&lock); |
198 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
199 |
return error; |
200 |
} |
201 |
|
202 |
/** |
203 |
* ccs_write_address_group_policy - Write "struct address_group_entry" list. |
204 |
* |
205 |
* @data: String to parse. |
206 |
* @is_delete: True if it is a delete request. |
207 |
* |
208 |
* Returns 0 on success, negative value otherwise. |
209 |
*/ |
210 |
int ccs_write_address_group_policy(char *data, const bool is_delete) |
211 |
{ |
212 |
u8 count; |
213 |
bool is_ipv6; |
214 |
u16 min_address[8]; |
215 |
u16 max_address[8]; |
216 |
char *cp = strchr(data, ' '); |
217 |
if (!cp) |
218 |
return -EINVAL; |
219 |
*cp++ = '\0'; |
220 |
count = sscanf(cp, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx" |
221 |
"-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
222 |
&min_address[0], &min_address[1], |
223 |
&min_address[2], &min_address[3], |
224 |
&min_address[4], &min_address[5], |
225 |
&min_address[6], &min_address[7], |
226 |
&max_address[0], &max_address[1], |
227 |
&max_address[2], &max_address[3], |
228 |
&max_address[4], &max_address[5], |
229 |
&max_address[6], &max_address[7]); |
230 |
if (count == 8 || count == 16) { |
231 |
u8 i; |
232 |
for (i = 0; i < 8; i++) { |
233 |
min_address[i] = htons(min_address[i]); |
234 |
max_address[i] = htons(max_address[i]); |
235 |
} |
236 |
if (count == 8) |
237 |
memmove(max_address, min_address, sizeof(min_address)); |
238 |
is_ipv6 = true; |
239 |
goto ok; |
240 |
} |
241 |
count = sscanf(cp, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
242 |
&min_address[0], &min_address[1], |
243 |
&min_address[2], &min_address[3], |
244 |
&max_address[0], &max_address[1], |
245 |
&max_address[2], &max_address[3]); |
246 |
if (count == 4 || count == 8) { |
247 |
u32 ip = ((((u8) min_address[0]) << 24) |
248 |
+ (((u8) min_address[1]) << 16) |
249 |
+ (((u8) min_address[2]) << 8) |
250 |
+ (u8) min_address[3]); |
251 |
*(u32 *) min_address = ip; |
252 |
if (count == 8) |
253 |
ip = ((((u8) max_address[0]) << 24) |
254 |
+ (((u8) max_address[1]) << 16) |
255 |
+ (((u8) max_address[2]) << 8) |
256 |
+ (u8) max_address[3]); |
257 |
*(u32 *) max_address = ip; |
258 |
is_ipv6 = false; |
259 |
goto ok; |
260 |
} |
261 |
return -EINVAL; |
262 |
ok: |
263 |
return update_address_group_entry(data, is_ipv6, |
264 |
min_address, max_address, is_delete); |
265 |
} |
266 |
|
267 |
/** |
268 |
* find_or_assign_new_address_group - Create address group. |
269 |
* |
270 |
* @group_name: The name of address group. |
271 |
* |
272 |
* Returns pointer to "struct address_group_entry" on success, NULL otherwise. |
273 |
*/ |
274 |
static struct address_group_entry * |
275 |
find_or_assign_new_address_group(const char *group_name) |
276 |
{ |
277 |
u8 i; |
278 |
struct address_group_entry *group; |
279 |
for (i = 0; i <= 1; i++) { |
280 |
list1_for_each_entry(group, &address_group_list, list) { |
281 |
if (!strcmp(group_name, group->group_name->name)) |
282 |
return group; |
283 |
} |
284 |
if (!i) { |
285 |
const u16 dummy[2] = { 0, 0 }; |
286 |
update_address_group_entry(group_name, false, |
287 |
dummy, dummy, false); |
288 |
update_address_group_entry(group_name, false, |
289 |
dummy, dummy, true); |
290 |
} |
291 |
} |
292 |
return NULL; |
293 |
} |
294 |
|
295 |
/** |
296 |
* address_matches_to_group - Check whether the given address matches members of the given address group. |
297 |
* |
298 |
* @is_ipv6: True if @address is an IPv6 address. |
299 |
* @address: An IPv4 or IPv6 address. |
300 |
* @group: Pointer to "struct address_group_entry". |
301 |
* |
302 |
* Returns true if @address matches addresses in @group group, false otherwise. |
303 |
*/ |
304 |
static bool address_matches_to_group(const bool is_ipv6, const u32 *address, |
305 |
const struct address_group_entry *group) |
306 |
{ |
307 |
struct address_group_member *member; |
308 |
const u32 ip = ntohl(*address); |
309 |
list1_for_each_entry(member, &group->address_group_member_list, list) { |
310 |
if (member->is_deleted) |
311 |
continue; |
312 |
if (member->is_ipv6) { |
313 |
if (is_ipv6 && |
314 |
memcmp(member->min.ipv6, address, 16) <= 0 && |
315 |
memcmp(address, member->max.ipv6, 16) <= 0) |
316 |
return true; |
317 |
} else { |
318 |
if (!is_ipv6 && |
319 |
member->min.ipv4 <= ip && ip <= member->max.ipv4) |
320 |
return true; |
321 |
} |
322 |
} |
323 |
return false; |
324 |
} |
325 |
|
326 |
/** |
327 |
* ccs_read_address_group_policy - Read "struct address_group_entry" list. |
328 |
* |
329 |
* @head: Pointer to "struct ccs_io_buffer". |
330 |
* |
331 |
* Returns true on success, false otherwise. |
332 |
*/ |
333 |
bool ccs_read_address_group_policy(struct ccs_io_buffer *head) |
334 |
{ |
335 |
struct list1_head *gpos; |
336 |
struct list1_head *mpos; |
337 |
list1_for_each_cookie(gpos, head->read_var1, &address_group_list) { |
338 |
struct address_group_entry *group; |
339 |
group = list1_entry(gpos, struct address_group_entry, list); |
340 |
list1_for_each_cookie(mpos, head->read_var2, |
341 |
&group->address_group_member_list) { |
342 |
char buf[128]; |
343 |
struct address_group_member *member; |
344 |
member = list1_entry(mpos, struct address_group_member, |
345 |
list); |
346 |
if (member->is_deleted) |
347 |
continue; |
348 |
if (member->is_ipv6) { |
349 |
const struct in6_addr *min_address |
350 |
= member->min.ipv6; |
351 |
const struct in6_addr *max_address |
352 |
= member->max.ipv6; |
353 |
ccs_print_ipv6(buf, sizeof(buf), min_address); |
354 |
if (min_address != max_address) { |
355 |
int len; |
356 |
char *cp = strchr(buf, '\0'); |
357 |
*cp++ = '-'; |
358 |
len = strlen(buf); |
359 |
ccs_print_ipv6(cp, sizeof(buf) - len, |
360 |
max_address); |
361 |
} |
362 |
} else { |
363 |
const u32 min_address = member->min.ipv4; |
364 |
const u32 max_address = member->max.ipv4; |
365 |
memset(buf, 0, sizeof(buf)); |
366 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", |
367 |
HIPQUAD(min_address)); |
368 |
if (min_address != max_address) { |
369 |
const int len = strlen(buf); |
370 |
snprintf(buf + len, |
371 |
sizeof(buf) - 1 - len, |
372 |
"-%u.%u.%u.%u", |
373 |
HIPQUAD(max_address)); |
374 |
} |
375 |
} |
376 |
if (!ccs_io_printf(head, KEYWORD_ADDRESS_GROUP |
377 |
"%s %s\n", group->group_name->name, |
378 |
buf)) |
379 |
goto out; |
380 |
} |
381 |
} |
382 |
return true; |
383 |
out: |
384 |
return false; |
385 |
} |
386 |
|
387 |
#if !defined(NIP6) |
388 |
#define NIP6(addr) \ |
389 |
ntohs((addr).s6_addr16[0]), ntohs((addr).s6_addr16[1]), \ |
390 |
ntohs((addr).s6_addr16[2]), ntohs((addr).s6_addr16[3]), \ |
391 |
ntohs((addr).s6_addr16[4]), ntohs((addr).s6_addr16[5]), \ |
392 |
ntohs((addr).s6_addr16[6]), ntohs((addr).s6_addr16[7]) |
393 |
#endif |
394 |
|
395 |
/** |
396 |
* ccs_print_ipv6 - Print an IPv6 address. |
397 |
* |
398 |
* @buffer: Buffer to write to. |
399 |
* @buffer_len: Size of @buffer. |
400 |
* @ip: Pointer to "struct in6_addr". |
401 |
* |
402 |
* Returns nothing. |
403 |
*/ |
404 |
void ccs_print_ipv6(char *buffer, const int buffer_len, |
405 |
const struct in6_addr *ip) |
406 |
{ |
407 |
memset(buffer, 0, buffer_len); |
408 |
snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip)); |
409 |
} |
410 |
|
411 |
/** |
412 |
* ccs_net2keyword - Convert network operation index to network operation name. |
413 |
* |
414 |
* @operation: Type of operation. |
415 |
* |
416 |
* Returns the name of operation. |
417 |
*/ |
418 |
const char *ccs_net2keyword(const u8 operation) |
419 |
{ |
420 |
const char *keyword = "unknown"; |
421 |
switch (operation) { |
422 |
case NETWORK_ACL_UDP_BIND: |
423 |
keyword = "UDP bind"; |
424 |
break; |
425 |
case NETWORK_ACL_UDP_CONNECT: |
426 |
keyword = "UDP connect"; |
427 |
break; |
428 |
case NETWORK_ACL_TCP_BIND: |
429 |
keyword = "TCP bind"; |
430 |
break; |
431 |
case NETWORK_ACL_TCP_LISTEN: |
432 |
keyword = "TCP listen"; |
433 |
break; |
434 |
case NETWORK_ACL_TCP_CONNECT: |
435 |
keyword = "TCP connect"; |
436 |
break; |
437 |
case NETWORK_ACL_TCP_ACCEPT: |
438 |
keyword = "TCP accept"; |
439 |
break; |
440 |
case NETWORK_ACL_RAW_BIND: |
441 |
keyword = "RAW bind"; |
442 |
break; |
443 |
case NETWORK_ACL_RAW_CONNECT: |
444 |
keyword = "RAW connect"; |
445 |
break; |
446 |
} |
447 |
return keyword; |
448 |
} |
449 |
|
450 |
/** |
451 |
* update_network_entry - Update "struct ip_network_acl_record" list. |
452 |
* |
453 |
* @operation: Type of operation. |
454 |
* @record_type: Type of address. |
455 |
* @group: Pointer to "struct address_group_entry". May be NULL. |
456 |
* @min_address: Start of IPv4 or IPv6 address range. |
457 |
* @max_address: End of IPv4 or IPv6 address range. |
458 |
* @min_port: Start of port number range. |
459 |
* @max_port: End of port number range. |
460 |
* @domain: Pointer to "struct domain_info". |
461 |
* @condition: Pointer to "struct condition_list". May be NULL. |
462 |
* @is_delete: True if it is a delete request. |
463 |
* |
464 |
* Returns 0 on success, negative value otherwise. |
465 |
*/ |
466 |
static int update_network_entry(const u8 operation, const u8 record_type, |
467 |
const struct address_group_entry *group, |
468 |
const u32 *min_address, const u32 *max_address, |
469 |
const u16 min_port, const u16 max_port, |
470 |
struct domain_info *domain, |
471 |
const struct condition_list *condition, |
472 |
const bool is_delete) |
473 |
{ |
474 |
struct acl_info *ptr; |
475 |
struct ip_network_acl_record *acl; |
476 |
int error = -ENOMEM; |
477 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
478 |
const u32 min_ip = ntohl(*min_address); |
479 |
const u32 max_ip = ntohl(*max_address); |
480 |
const struct in6_addr *saved_min_address = NULL; |
481 |
const struct in6_addr *saved_max_address = NULL; |
482 |
if (!domain) |
483 |
return -EINVAL; |
484 |
if (record_type != IP_RECORD_TYPE_IPv6) |
485 |
goto not_ipv6; |
486 |
saved_min_address = save_ipv6_address((struct in6_addr *) min_address); |
487 |
saved_max_address = save_ipv6_address((struct in6_addr *) max_address); |
488 |
if (!saved_min_address || !saved_max_address) |
489 |
return -ENOMEM; |
490 |
not_ipv6: |
491 |
mutex_lock(&domain_acl_lock); |
492 |
if (is_delete) |
493 |
goto delete; |
494 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
495 |
if (ccs_acl_type1(ptr) != TYPE_IP_NETWORK_ACL) |
496 |
continue; |
497 |
if (ccs_get_condition_part(ptr) != condition) |
498 |
continue; |
499 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
500 |
if (acl->operation_type != operation || |
501 |
acl->record_type != record_type || |
502 |
acl->min_port != min_port || max_port != acl->max_port) |
503 |
continue; |
504 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
505 |
if (acl->u.group != group) |
506 |
continue; |
507 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
508 |
if (acl->u.ipv4.min != min_ip || |
509 |
max_ip != acl->u.ipv4.max) |
510 |
continue; |
511 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
512 |
if (acl->u.ipv6.min != saved_min_address || |
513 |
saved_max_address != acl->u.ipv6.max) |
514 |
continue; |
515 |
} |
516 |
error = ccs_add_domain_acl(NULL, ptr); |
517 |
goto out; |
518 |
} |
519 |
/* Not found. Append it to the tail. */ |
520 |
acl = ccs_alloc_acl_element(TYPE_IP_NETWORK_ACL, condition); |
521 |
if (!acl) |
522 |
goto out; |
523 |
acl->operation_type = operation; |
524 |
acl->record_type = record_type; |
525 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
526 |
acl->u.group = group; |
527 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
528 |
acl->u.ipv4.min = min_ip; |
529 |
acl->u.ipv4.max = max_ip; |
530 |
} else { |
531 |
acl->u.ipv6.min = saved_min_address; |
532 |
acl->u.ipv6.max = saved_max_address; |
533 |
} |
534 |
acl->min_port = min_port; |
535 |
acl->max_port = max_port; |
536 |
error = ccs_add_domain_acl(domain, &acl->head); |
537 |
goto out; |
538 |
delete: |
539 |
error = -ENOENT; |
540 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
541 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
542 |
continue; |
543 |
if (ccs_get_condition_part(ptr) != condition) |
544 |
continue; |
545 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
546 |
if (acl->operation_type != operation || |
547 |
acl->record_type != record_type || |
548 |
acl->min_port != min_port || max_port != acl->max_port) |
549 |
continue; |
550 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
551 |
if (acl->u.group != group) |
552 |
continue; |
553 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
554 |
if (acl->u.ipv4.min != min_ip || |
555 |
max_ip != acl->u.ipv4.max) |
556 |
continue; |
557 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
558 |
if (acl->u.ipv6.min != saved_min_address || |
559 |
saved_max_address != acl->u.ipv6.max) |
560 |
continue; |
561 |
} |
562 |
error = ccs_del_domain_acl(ptr); |
563 |
break; |
564 |
} |
565 |
out: |
566 |
mutex_unlock(&domain_acl_lock); |
567 |
return error; |
568 |
} |
569 |
|
570 |
/** |
571 |
* check_network_entry - Check permission for network operation. |
572 |
* |
573 |
* @is_ipv6: True if @address is an IPv6 address. |
574 |
* @operation: Type of operation. |
575 |
* @address: An IPv4 or IPv6 address. |
576 |
* @port: Port number. |
577 |
* |
578 |
* Returns 0 on success, negative value otherwise. |
579 |
*/ |
580 |
static int check_network_entry(const bool is_ipv6, const u8 operation, |
581 |
const u32 *address, const u16 port) |
582 |
{ |
583 |
unsigned short int retries = 0; |
584 |
struct domain_info * const domain = current->domain_info; |
585 |
struct acl_info *ptr; |
586 |
const char *keyword = ccs_net2keyword(operation); |
587 |
const u8 profile = current->domain_info->profile; |
588 |
const u8 mode = ccs_check_flags(CCS_TOMOYO_MAC_FOR_NETWORK); |
589 |
const bool is_enforce = (mode == 3); |
590 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
591 |
const u32 ip = ntohl(*address); |
592 |
bool found = false; |
593 |
char buf[64]; |
594 |
if (!mode) |
595 |
return 0; |
596 |
retry: |
597 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
598 |
struct ip_network_acl_record *acl; |
599 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
600 |
continue; |
601 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
602 |
if (acl->operation_type != operation || port < acl->min_port || |
603 |
acl->max_port < port || !ccs_check_condition(ptr, NULL)) |
604 |
continue; |
605 |
if (acl->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
606 |
if (!address_matches_to_group(is_ipv6, address, |
607 |
acl->u.group)) |
608 |
continue; |
609 |
} else if (acl->record_type == IP_RECORD_TYPE_IPv4) { |
610 |
if (is_ipv6 || |
611 |
ip < acl->u.ipv4.min || acl->u.ipv4.max < ip) |
612 |
continue; |
613 |
} else { |
614 |
if (!is_ipv6 || |
615 |
memcmp(acl->u.ipv6.min, address, 16) > 0 || |
616 |
memcmp(address, acl->u.ipv6.max, 16) > 0) |
617 |
continue; |
618 |
} |
619 |
ccs_update_condition(ptr); |
620 |
found = true; |
621 |
break; |
622 |
} |
623 |
memset(buf, 0, sizeof(buf)); |
624 |
if (is_ipv6) |
625 |
ccs_print_ipv6(buf, sizeof(buf), |
626 |
(const struct in6_addr *) address); |
627 |
else |
628 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
629 |
audit_network_log(is_ipv6, keyword, buf, port, found, profile, mode); |
630 |
if (found) |
631 |
return 0; |
632 |
if (ccs_verbose_mode()) |
633 |
printk(KERN_WARNING "TOMOYO-%s: %s to %s %u denied for %s\n", |
634 |
ccs_get_msg(is_enforce), keyword, buf, port, |
635 |
ccs_get_last_name(domain)); |
636 |
if (is_enforce) { |
637 |
int error = ccs_check_supervisor(retries, NULL, |
638 |
KEYWORD_ALLOW_NETWORK |
639 |
"%s %s %u\n", keyword, buf, |
640 |
port); |
641 |
if (error == 1) { |
642 |
retries++; |
643 |
goto retry; |
644 |
} |
645 |
return error; |
646 |
} |
647 |
if (mode == 1 && ccs_check_domain_quota(domain)) |
648 |
update_network_entry(operation, is_ipv6 ? |
649 |
IP_RECORD_TYPE_IPv6 : IP_RECORD_TYPE_IPv4, |
650 |
NULL, address, address, port, port, domain, |
651 |
NULL, 0); |
652 |
return 0; |
653 |
} |
654 |
|
655 |
/** |
656 |
* ccs_write_network_policy - Write "struct ip_network_acl_record" list. |
657 |
* |
658 |
* @data: String to parse. |
659 |
* @domain: Pointer to "struct domain_info". |
660 |
* @condition: Pointer to "struct condition_list". May be NULL. |
661 |
* @is_delete: True if it is a delete request. |
662 |
* |
663 |
* Returns 0 on success, negative value otherwise. |
664 |
*/ |
665 |
int ccs_write_network_policy(char *data, struct domain_info *domain, |
666 |
const struct condition_list *condition, |
667 |
const bool is_delete) |
668 |
{ |
669 |
u8 sock_type; |
670 |
u8 operation; |
671 |
u8 record_type; |
672 |
u16 min_address[8]; |
673 |
u16 max_address[8]; |
674 |
struct address_group_entry *group = NULL; |
675 |
u16 min_port; |
676 |
u16 max_port; |
677 |
u8 count; |
678 |
char *cp1 = strchr(data, ' '); |
679 |
char *cp2; |
680 |
if (!cp1) |
681 |
goto out; |
682 |
cp1++; |
683 |
if (!strncmp(data, "TCP ", 4)) |
684 |
sock_type = SOCK_STREAM; |
685 |
else if (!strncmp(data, "UDP ", 4)) |
686 |
sock_type = SOCK_DGRAM; |
687 |
else if (!strncmp(data, "RAW ", 4)) |
688 |
sock_type = SOCK_RAW; |
689 |
else |
690 |
goto out; |
691 |
cp2 = strchr(cp1, ' '); |
692 |
if (!cp2) |
693 |
goto out; |
694 |
cp2++; |
695 |
if (!strncmp(cp1, "bind ", 5)) |
696 |
switch (sock_type) { |
697 |
case SOCK_STREAM: |
698 |
operation = NETWORK_ACL_TCP_BIND; |
699 |
break; |
700 |
case SOCK_DGRAM: |
701 |
operation = NETWORK_ACL_UDP_BIND; |
702 |
break; |
703 |
default: |
704 |
operation = NETWORK_ACL_RAW_BIND; |
705 |
} |
706 |
else if (!strncmp(cp1, "connect ", 8)) |
707 |
switch (sock_type) { |
708 |
case SOCK_STREAM: |
709 |
operation = NETWORK_ACL_TCP_CONNECT; |
710 |
break; |
711 |
case SOCK_DGRAM: |
712 |
operation = NETWORK_ACL_UDP_CONNECT; |
713 |
break; |
714 |
default: |
715 |
operation = NETWORK_ACL_RAW_CONNECT; |
716 |
} |
717 |
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "listen ", 7)) |
718 |
operation = NETWORK_ACL_TCP_LISTEN; |
719 |
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "accept ", 7)) |
720 |
operation = NETWORK_ACL_TCP_ACCEPT; |
721 |
else |
722 |
goto out; |
723 |
cp1 = strchr(cp2, ' '); |
724 |
if (!cp1) |
725 |
goto out; |
726 |
*cp1++ = '\0'; |
727 |
count = sscanf(cp2, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx" |
728 |
"-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
729 |
&min_address[0], &min_address[1], |
730 |
&min_address[2], &min_address[3], |
731 |
&min_address[4], &min_address[5], |
732 |
&min_address[6], &min_address[7], |
733 |
&max_address[0], &max_address[1], |
734 |
&max_address[2], &max_address[3], |
735 |
&max_address[4], &max_address[5], |
736 |
&max_address[6], &max_address[7]); |
737 |
if (count == 8 || count == 16) { |
738 |
u8 i; |
739 |
for (i = 0; i < 8; i++) { |
740 |
min_address[i] = htons(min_address[i]); |
741 |
max_address[i] = htons(max_address[i]); |
742 |
} |
743 |
if (count == 8) |
744 |
memmove(max_address, min_address, sizeof(min_address)); |
745 |
record_type = IP_RECORD_TYPE_IPv6; |
746 |
goto ok; |
747 |
} |
748 |
count = sscanf(cp2, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
749 |
&min_address[0], &min_address[1], |
750 |
&min_address[2], &min_address[3], |
751 |
&max_address[0], &max_address[1], |
752 |
&max_address[2], &max_address[3]); |
753 |
if (count == 4 || count == 8) { |
754 |
u32 ip = htonl((((u8) min_address[0]) << 24) |
755 |
+ (((u8) min_address[1]) << 16) |
756 |
+ (((u8) min_address[2]) << 8) |
757 |
+ (u8) min_address[3]); |
758 |
*(u32 *) min_address = ip; |
759 |
if (count == 8) |
760 |
ip = htonl((((u8) max_address[0]) << 24) |
761 |
+ (((u8) max_address[1]) << 16) |
762 |
+ (((u8) max_address[2]) << 8) |
763 |
+ (u8) max_address[3]); |
764 |
*(u32 *) max_address = ip; |
765 |
record_type = IP_RECORD_TYPE_IPv4; |
766 |
goto ok; |
767 |
} |
768 |
if (*cp2 == '@') { |
769 |
group = find_or_assign_new_address_group(cp2 + 1); |
770 |
if (!group) |
771 |
return -ENOMEM; |
772 |
record_type = IP_RECORD_TYPE_ADDRESS_GROUP; |
773 |
goto ok; |
774 |
} |
775 |
out: |
776 |
return -EINVAL; |
777 |
ok: |
778 |
if (strchr(cp1, ' ')) |
779 |
goto out; |
780 |
count = sscanf(cp1, "%hu-%hu", &min_port, &max_port); |
781 |
if (count != 1 && count != 2) |
782 |
goto out; |
783 |
if (count == 1) |
784 |
max_port = min_port; |
785 |
return update_network_entry(operation, record_type, group, |
786 |
(u32 *) min_address, (u32 *) max_address, |
787 |
min_port, max_port, domain, condition, |
788 |
is_delete); |
789 |
} |
790 |
|
791 |
/** |
792 |
* ccs_check_network_listen_acl - Check permission for listen() operation. |
793 |
* |
794 |
* @is_ipv6: True if @address is an IPv6 address. |
795 |
* @address: An IPv4 or IPv6 address. |
796 |
* @port: Port number. |
797 |
* |
798 |
* Returns 0 on success, negative value otherwise. |
799 |
*/ |
800 |
int ccs_check_network_listen_acl(const _Bool is_ipv6, const u8 *address, |
801 |
const u16 port) |
802 |
{ |
803 |
return check_network_entry(is_ipv6, NETWORK_ACL_TCP_LISTEN, |
804 |
(const u32 *) address, ntohs(port)); |
805 |
} |
806 |
|
807 |
/** |
808 |
* ccs_check_network_connect_acl - Check permission for connect() operation. |
809 |
* |
810 |
* @is_ipv6: True if @address is an IPv6 address. |
811 |
* @sock_type: Type of socket. (TCP or UDP or RAW) |
812 |
* @address: An IPv4 or IPv6 address. |
813 |
* @port: Port number. |
814 |
* |
815 |
* Returns 0 on success, negative value otherwise. |
816 |
*/ |
817 |
int ccs_check_network_connect_acl(const _Bool is_ipv6, const int sock_type, |
818 |
const u8 *address, const u16 port) |
819 |
{ |
820 |
u8 operation; |
821 |
switch (sock_type) { |
822 |
case SOCK_STREAM: |
823 |
operation = NETWORK_ACL_TCP_CONNECT; |
824 |
break; |
825 |
case SOCK_DGRAM: |
826 |
operation = NETWORK_ACL_UDP_CONNECT; |
827 |
break; |
828 |
default: |
829 |
operation = NETWORK_ACL_RAW_CONNECT; |
830 |
} |
831 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
832 |
ntohs(port)); |
833 |
} |
834 |
|
835 |
/** |
836 |
* ccs_check_network_bind_acl - Check permission for bind() operation. |
837 |
* |
838 |
* @is_ipv6: True if @address is an IPv6 address. |
839 |
* @sock_type: Type of socket. (TCP or UDP or RAW) |
840 |
* @address: An IPv4 or IPv6 address. |
841 |
* @port: Port number. |
842 |
* |
843 |
* Returns 0 on success, negative value otherwise. |
844 |
*/ |
845 |
int ccs_check_network_bind_acl(const _Bool is_ipv6, const int sock_type, |
846 |
const u8 *address, const u16 port) |
847 |
{ |
848 |
u8 operation; |
849 |
switch (sock_type) { |
850 |
case SOCK_STREAM: |
851 |
operation = NETWORK_ACL_TCP_BIND; |
852 |
break; |
853 |
case SOCK_DGRAM: |
854 |
operation = NETWORK_ACL_UDP_BIND; |
855 |
break; |
856 |
default: |
857 |
operation = NETWORK_ACL_RAW_BIND; |
858 |
} |
859 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
860 |
ntohs(port)); |
861 |
} |
862 |
|
863 |
/** |
864 |
* ccs_check_network_accept_acl - Check permission for accept() operation. |
865 |
* |
866 |
* @is_ipv6: True if @address is an IPv6 address. |
867 |
* @address: An IPv4 or IPv6 address. |
868 |
* @port: Port number. |
869 |
* |
870 |
* Returns 0 on success, negative value otherwise. |
871 |
*/ |
872 |
int ccs_check_network_accept_acl(const _Bool is_ipv6, const u8 *address, |
873 |
const u16 port) |
874 |
{ |
875 |
int retval; |
876 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
877 |
retval = check_network_entry(is_ipv6, NETWORK_ACL_TCP_ACCEPT, |
878 |
(const u32 *) address, ntohs(port)); |
879 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
880 |
return retval; |
881 |
} |
882 |
|
883 |
/** |
884 |
* ccs_check_network_sendmsg_acl - Check permission for sendmsg() operation. |
885 |
* |
886 |
* @is_ipv6: True if @address is an IPv6 address. |
887 |
* @sock_type: Type of socket. (UDP or RAW) |
888 |
* @address: An IPv4 or IPv6 address. |
889 |
* @port: Port number. |
890 |
* |
891 |
* Returns 0 on success, negative value otherwise. |
892 |
*/ |
893 |
int ccs_check_network_sendmsg_acl(const _Bool is_ipv6, const int sock_type, |
894 |
const u8 *address, const u16 port) |
895 |
{ |
896 |
u8 operation; |
897 |
if (sock_type == SOCK_DGRAM) |
898 |
operation = NETWORK_ACL_UDP_CONNECT; |
899 |
else |
900 |
operation = NETWORK_ACL_RAW_CONNECT; |
901 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
902 |
ntohs(port)); |
903 |
} |
904 |
|
905 |
/** |
906 |
* ccs_check_network_recvmsg_acl - Check permission for recvmsg() operation. |
907 |
* |
908 |
* @is_ipv6: True if @address is an IPv6 address. |
909 |
* @sock_type: Type of socket. (UDP or RAW) |
910 |
* @address: An IPv4 or IPv6 address. |
911 |
* @port: Port number. |
912 |
* |
913 |
* Returns 0 on success, negative value otherwise. |
914 |
*/ |
915 |
int ccs_check_network_recvmsg_acl(const _Bool is_ipv6, const int sock_type, |
916 |
const u8 *address, const u16 port) |
917 |
{ |
918 |
int retval; |
919 |
const u8 operation |
920 |
= (sock_type == SOCK_DGRAM) ? |
921 |
NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT; |
922 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
923 |
retval = check_network_entry(is_ipv6, operation, (const u32 *) address, |
924 |
ntohs(port)); |
925 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
926 |
return retval; |
927 |
} |