1 |
/* |
2 |
* fs/tomoyo_network.c |
3 |
* |
4 |
* Implementation of the Domain-Based Mandatory Access Control. |
5 |
* |
6 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
7 |
* |
8 |
* Version: 1.6.8-pre 2009/05/08 |
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/tomoyo_socket.h> |
18 |
#include <linux/realpath.h> |
19 |
#include <linux/net.h> |
20 |
#include <linux/inet.h> |
21 |
#include <linux/in.h> |
22 |
#include <linux/in6.h> |
23 |
#include <net/ip.h> |
24 |
#include <net/ipv6.h> |
25 |
#include <net/udp.h> |
26 |
|
27 |
/* Index numbers for Network Controls. */ |
28 |
enum ccs_network_acl_index { |
29 |
NETWORK_ACL_UDP_BIND, |
30 |
NETWORK_ACL_UDP_CONNECT, |
31 |
NETWORK_ACL_TCP_BIND, |
32 |
NETWORK_ACL_TCP_LISTEN, |
33 |
NETWORK_ACL_TCP_CONNECT, |
34 |
NETWORK_ACL_TCP_ACCEPT, |
35 |
NETWORK_ACL_RAW_BIND, |
36 |
NETWORK_ACL_RAW_CONNECT |
37 |
}; |
38 |
|
39 |
/** |
40 |
* ccs_audit_network_log - Audit network log. |
41 |
* |
42 |
* @r: Pointer to "struct ccs_request_info". |
43 |
* @operation: The name of operation. |
44 |
* @address: An IPv4 or IPv6 address. |
45 |
* @port: Port number. |
46 |
* @is_granted: True if this is a granted log. |
47 |
* |
48 |
* Returns 0 on success, negative value otherwise. |
49 |
*/ |
50 |
static int ccs_audit_network_log(struct ccs_request_info *r, |
51 |
const char *operation, const char *address, |
52 |
const u16 port, const bool is_granted) |
53 |
{ |
54 |
return ccs_write_audit_log(is_granted, r, KEYWORD_ALLOW_NETWORK |
55 |
"%s %s %u\n", operation, address, port); |
56 |
} |
57 |
|
58 |
/* The list for "struct ccs_address_group_entry". */ |
59 |
LIST_HEAD(ccs_address_group_list); |
60 |
|
61 |
/** |
62 |
* ccs_get_address_group - Allocate memory for "struct ccs_address_group_entry". |
63 |
* |
64 |
* @group_name: The name of address group. |
65 |
* |
66 |
* Returns pointer to "struct ccs_address_group_entry" on success, |
67 |
* NULL otherwise. |
68 |
*/ |
69 |
static struct ccs_address_group_entry *ccs_get_address_group(const char * |
70 |
group_name) |
71 |
{ |
72 |
struct ccs_address_group_entry *entry = NULL; |
73 |
struct ccs_address_group_entry *group; |
74 |
const struct ccs_path_info *saved_group_name; |
75 |
int error = -ENOMEM; |
76 |
if (!ccs_is_correct_path(group_name, 0, 0, 0, __func__) || |
77 |
!group_name[0]) |
78 |
return NULL; |
79 |
saved_group_name = ccs_get_name(group_name); |
80 |
if (!saved_group_name) |
81 |
return NULL; |
82 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
83 |
/***** WRITER SECTION START *****/ |
84 |
down_write(&ccs_policy_lock); |
85 |
list_for_each_entry(group, &ccs_address_group_list, list) { |
86 |
if (saved_group_name != group->group_name) |
87 |
continue; |
88 |
atomic_inc(&group->users); |
89 |
error = 0; |
90 |
break; |
91 |
} |
92 |
if (error && ccs_memory_ok(entry)) { |
93 |
INIT_LIST_HEAD(&entry->address_group_member_list); |
94 |
entry->group_name = saved_group_name; |
95 |
saved_group_name = NULL; |
96 |
atomic_set(&entry->users, 1); |
97 |
list_add_tail(&entry->list, &ccs_address_group_list); |
98 |
group = entry; |
99 |
entry = NULL; |
100 |
error = 0; |
101 |
} |
102 |
up_write(&ccs_policy_lock); |
103 |
/***** WRITER SECTION END *****/ |
104 |
ccs_put_name(saved_group_name); |
105 |
kfree(entry); |
106 |
return !error ? group : NULL; |
107 |
} |
108 |
|
109 |
/** |
110 |
* ccs_update_address_group_entry - Update "struct ccs_address_group_entry" list. |
111 |
* |
112 |
* @group_name: The name of address group. |
113 |
* @is_ipv6: True if @min_address and @max_address are IPv6 addresses. |
114 |
* @min_address: Start of IPv4 or IPv6 address range. |
115 |
* @max_address: End of IPv4 or IPv6 address range. |
116 |
* @is_delete: True if it is a delete request. |
117 |
* |
118 |
* Returns 0 on success, negative value otherwise. |
119 |
*/ |
120 |
static int ccs_update_address_group_entry(const char *group_name, |
121 |
const bool is_ipv6, |
122 |
const u16 *min_address, |
123 |
const u16 *max_address, |
124 |
const bool is_delete) |
125 |
{ |
126 |
struct ccs_address_group_entry *group; |
127 |
struct ccs_address_group_member *entry = NULL; |
128 |
struct ccs_address_group_member *member; |
129 |
const struct in6_addr *saved_min_address = NULL; |
130 |
const struct in6_addr *saved_max_address = NULL; |
131 |
int error = is_delete ? -ENOENT : -ENOMEM; |
132 |
const u32 min_ipv4_address = ntohl(*(u32 *) min_address); |
133 |
const u32 max_ipv4_address = ntohl(*(u32 *) max_address); |
134 |
group = ccs_get_address_group(group_name); |
135 |
if (!group) |
136 |
return -ENOMEM; |
137 |
if (is_ipv6) { |
138 |
saved_min_address |
139 |
= ccs_get_ipv6_address((struct in6_addr *) |
140 |
min_address); |
141 |
saved_max_address |
142 |
= ccs_get_ipv6_address((struct in6_addr *) |
143 |
max_address); |
144 |
if (!saved_min_address || !saved_max_address) |
145 |
goto out; |
146 |
} |
147 |
if (!is_delete) |
148 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
149 |
/***** WRITER SECTION START *****/ |
150 |
down_write(&ccs_policy_lock); |
151 |
list_for_each_entry(member, &group->address_group_member_list, 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 != min_ipv4_address || |
160 |
member->max.ipv4 != max_ipv4_address) |
161 |
continue; |
162 |
} |
163 |
member->is_deleted = is_delete; |
164 |
error = 0; |
165 |
break; |
166 |
} |
167 |
if (!is_delete && error && ccs_memory_ok(entry)) { |
168 |
entry->is_ipv6 = is_ipv6; |
169 |
if (is_ipv6) { |
170 |
entry->min.ipv6 = saved_min_address; |
171 |
saved_min_address = NULL; |
172 |
entry->max.ipv6 = saved_max_address; |
173 |
saved_max_address = NULL; |
174 |
} else { |
175 |
entry->min.ipv4 = min_ipv4_address; |
176 |
entry->max.ipv4 = max_ipv4_address; |
177 |
} |
178 |
list_add_tail(&entry->list, &group->address_group_member_list); |
179 |
entry = NULL; |
180 |
error = 0; |
181 |
} |
182 |
up_write(&ccs_policy_lock); |
183 |
/***** WRITER SECTION END *****/ |
184 |
out: |
185 |
ccs_put_ipv6_address(saved_min_address); |
186 |
ccs_put_ipv6_address(saved_max_address); |
187 |
ccs_put_address_group(group); |
188 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
189 |
return error; |
190 |
} |
191 |
|
192 |
/** |
193 |
* ccs_parse_ip_address - Parse an IP address. |
194 |
* |
195 |
* @address: String to parse. |
196 |
* @min: Pointer to store min address. |
197 |
* @max: Pointer to store max address. |
198 |
* |
199 |
* Returns 2 if @address is an IPv6, 1 if @address is an IPv4, 0 otherwise. |
200 |
*/ |
201 |
static int ccs_parse_ip_address(char *address, u16 *min, u16 *max) |
202 |
{ |
203 |
int count = sscanf(address, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx" |
204 |
"-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
205 |
&min[0], &min[1], &min[2], &min[3], |
206 |
&min[4], &min[5], &min[6], &min[7], |
207 |
&max[0], &max[1], &max[2], &max[3], |
208 |
&max[4], &max[5], &max[6], &max[7]); |
209 |
if (count == 8 || count == 16) { |
210 |
u8 i; |
211 |
if (count == 8) |
212 |
memmove(max, min, sizeof(u16) * 8); |
213 |
for (i = 0; i < 8; i++) { |
214 |
min[i] = htons(min[i]); |
215 |
max[i] = htons(max[i]); |
216 |
} |
217 |
return 2; |
218 |
} |
219 |
count = sscanf(address, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
220 |
&min[0], &min[1], &min[2], &min[3], |
221 |
&max[0], &max[1], &max[2], &max[3]); |
222 |
if (count == 4 || count == 8) { |
223 |
u32 ip = htonl((((u8) min[0]) << 24) + (((u8) min[1]) << 16) |
224 |
+ (((u8) min[2]) << 8) + (u8) min[3]); |
225 |
memmove(min, &ip, sizeof(ip)); |
226 |
if (count == 8) |
227 |
ip = htonl((((u8) max[0]) << 24) + (((u8) max[1]) << 16) |
228 |
+ (((u8) max[2]) << 8) + (u8) max[3]); |
229 |
memmove(max, &ip, sizeof(ip)); |
230 |
return 1; |
231 |
} |
232 |
return 0; |
233 |
} |
234 |
|
235 |
/** |
236 |
* ccs_write_address_group_policy - Write "struct ccs_address_group_entry" list. |
237 |
* |
238 |
* @data: String to parse. |
239 |
* @is_delete: True if it is a delete request. |
240 |
* |
241 |
* Returns 0 on success, negative value otherwise. |
242 |
*/ |
243 |
int ccs_write_address_group_policy(char *data, const bool is_delete) |
244 |
{ |
245 |
bool is_ipv6; |
246 |
u16 min_address[8]; |
247 |
u16 max_address[8]; |
248 |
char *cp = strchr(data, ' '); |
249 |
if (!cp) |
250 |
return -EINVAL; |
251 |
*cp++ = '\0'; |
252 |
switch (ccs_parse_ip_address(cp, min_address, max_address)) { |
253 |
case 2: |
254 |
is_ipv6 = true; |
255 |
break; |
256 |
case 1: |
257 |
is_ipv6 = false; |
258 |
break; |
259 |
default: |
260 |
return -EINVAL; |
261 |
} |
262 |
return ccs_update_address_group_entry(data, is_ipv6, min_address, |
263 |
max_address, is_delete); |
264 |
} |
265 |
|
266 |
/** |
267 |
* ccs_address_matches_group - Check whether the given address matches members of the given address group. |
268 |
* |
269 |
* @is_ipv6: True if @address is an IPv6 address. |
270 |
* @address: An IPv4 or IPv6 address. |
271 |
* @group: Pointer to "struct ccs_address_group_entry". |
272 |
* |
273 |
* Returns true if @address matches addresses in @group group, false otherwise. |
274 |
* |
275 |
* Caller holds ccs_policy_lockfor reading. |
276 |
*/ |
277 |
static bool ccs_address_matches_group(const bool is_ipv6, const u32 *address, |
278 |
const struct ccs_address_group_entry * |
279 |
group) |
280 |
{ |
281 |
struct ccs_address_group_member *member; |
282 |
const u32 ip = ntohl(*address); |
283 |
bool matched = false; |
284 |
list_for_each_entry(member, &group->address_group_member_list, list) { |
285 |
if (member->is_deleted) |
286 |
continue; |
287 |
if (member->is_ipv6) { |
288 |
if (is_ipv6 && |
289 |
memcmp(member->min.ipv6, address, 16) <= 0 && |
290 |
memcmp(address, member->max.ipv6, 16) <= 0) { |
291 |
matched = true; |
292 |
break; |
293 |
} |
294 |
} else { |
295 |
if (!is_ipv6 && |
296 |
member->min.ipv4 <= ip && ip <= member->max.ipv4) { |
297 |
matched = true; |
298 |
break; |
299 |
} |
300 |
} |
301 |
} |
302 |
return matched; |
303 |
} |
304 |
|
305 |
/** |
306 |
* ccs_read_address_group_policy - Read "struct ccs_address_group_entry" list. |
307 |
* |
308 |
* @head: Pointer to "struct ccs_io_buffer". |
309 |
* |
310 |
* Returns true on success, false otherwise. |
311 |
*/ |
312 |
bool ccs_read_address_group_policy(struct ccs_io_buffer *head) |
313 |
{ |
314 |
struct list_head *gpos; |
315 |
struct list_head *mpos; |
316 |
bool done = true; |
317 |
/***** READER SECTION START *****/ |
318 |
down_read(&ccs_policy_lock); |
319 |
list_for_each_cookie(gpos, head->read_var1.u.list, |
320 |
&ccs_address_group_list) { |
321 |
struct ccs_address_group_entry *group; |
322 |
group = list_entry(gpos, struct ccs_address_group_entry, list); |
323 |
list_for_each_cookie(mpos, head->read_var2.u.list, |
324 |
&group->address_group_member_list) { |
325 |
char buf[128]; |
326 |
struct ccs_address_group_member *member; |
327 |
member = list_entry(mpos, |
328 |
struct ccs_address_group_member, |
329 |
list); |
330 |
if (member->is_deleted) |
331 |
continue; |
332 |
if (member->is_ipv6) { |
333 |
const struct in6_addr *min_address |
334 |
= member->min.ipv6; |
335 |
const struct in6_addr *max_address |
336 |
= member->max.ipv6; |
337 |
ccs_print_ipv6(buf, sizeof(buf), min_address); |
338 |
if (min_address != max_address) { |
339 |
int len; |
340 |
char *cp = buf + strlen(buf); |
341 |
*cp++ = '-'; |
342 |
len = strlen(buf); |
343 |
ccs_print_ipv6(cp, sizeof(buf) - len, |
344 |
max_address); |
345 |
} |
346 |
} else { |
347 |
const u32 min_address = member->min.ipv4; |
348 |
const u32 max_address = member->max.ipv4; |
349 |
memset(buf, 0, sizeof(buf)); |
350 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", |
351 |
HIPQUAD(min_address)); |
352 |
if (min_address != max_address) { |
353 |
const int len = strlen(buf); |
354 |
snprintf(buf + len, |
355 |
sizeof(buf) - 1 - len, |
356 |
"-%u.%u.%u.%u", |
357 |
HIPQUAD(max_address)); |
358 |
} |
359 |
} |
360 |
done = ccs_io_printf(head, KEYWORD_ADDRESS_GROUP |
361 |
"%s %s\n", group->group_name->name, |
362 |
buf); |
363 |
if (!done) |
364 |
break; |
365 |
} |
366 |
if (!done) |
367 |
break; |
368 |
} |
369 |
up_read(&ccs_policy_lock); |
370 |
/***** READER SECTION END *****/ |
371 |
return done; |
372 |
} |
373 |
|
374 |
#if !defined(NIP6) |
375 |
#define NIP6(addr) \ |
376 |
ntohs((addr).s6_addr16[0]), ntohs((addr).s6_addr16[1]), \ |
377 |
ntohs((addr).s6_addr16[2]), ntohs((addr).s6_addr16[3]), \ |
378 |
ntohs((addr).s6_addr16[4]), ntohs((addr).s6_addr16[5]), \ |
379 |
ntohs((addr).s6_addr16[6]), ntohs((addr).s6_addr16[7]) |
380 |
#endif |
381 |
|
382 |
/** |
383 |
* ccs_print_ipv6 - Print an IPv6 address. |
384 |
* |
385 |
* @buffer: Buffer to write to. |
386 |
* @buffer_len: Size of @buffer. |
387 |
* @ip: Pointer to "struct in6_addr". |
388 |
* |
389 |
* Returns nothing. |
390 |
*/ |
391 |
void ccs_print_ipv6(char *buffer, const int buffer_len, |
392 |
const struct in6_addr *ip) |
393 |
{ |
394 |
memset(buffer, 0, buffer_len); |
395 |
snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip)); |
396 |
} |
397 |
|
398 |
/** |
399 |
* ccs_net2keyword - Convert network operation index to network operation name. |
400 |
* |
401 |
* @operation: Type of operation. |
402 |
* |
403 |
* Returns the name of operation. |
404 |
*/ |
405 |
const char *ccs_net2keyword(const u8 operation) |
406 |
{ |
407 |
const char *keyword = "unknown"; |
408 |
switch (operation) { |
409 |
case NETWORK_ACL_UDP_BIND: |
410 |
keyword = "UDP bind"; |
411 |
break; |
412 |
case NETWORK_ACL_UDP_CONNECT: |
413 |
keyword = "UDP connect"; |
414 |
break; |
415 |
case NETWORK_ACL_TCP_BIND: |
416 |
keyword = "TCP bind"; |
417 |
break; |
418 |
case NETWORK_ACL_TCP_LISTEN: |
419 |
keyword = "TCP listen"; |
420 |
break; |
421 |
case NETWORK_ACL_TCP_CONNECT: |
422 |
keyword = "TCP connect"; |
423 |
break; |
424 |
case NETWORK_ACL_TCP_ACCEPT: |
425 |
keyword = "TCP accept"; |
426 |
break; |
427 |
case NETWORK_ACL_RAW_BIND: |
428 |
keyword = "RAW bind"; |
429 |
break; |
430 |
case NETWORK_ACL_RAW_CONNECT: |
431 |
keyword = "RAW connect"; |
432 |
break; |
433 |
} |
434 |
return keyword; |
435 |
} |
436 |
|
437 |
/** |
438 |
* ccs_update_network_entry - Update "struct ccs_ip_network_acl_record" list. |
439 |
* |
440 |
* @operation: Type of operation. |
441 |
* @record_type: Type of address. |
442 |
* @group: Name of group. May be NULL. |
443 |
* @min_address: Start of IPv4 or IPv6 address range. |
444 |
* @max_address: End of IPv4 or IPv6 address range. |
445 |
* @min_port: Start of port number range. |
446 |
* @max_port: End of port number range. |
447 |
* @domain: Pointer to "struct ccs_domain_info". |
448 |
* @condition: Pointer to "struct ccs_condition_list". May be NULL. |
449 |
* @is_delete: True if it is a delete request. |
450 |
* |
451 |
* Returns 0 on success, negative value otherwise. |
452 |
*/ |
453 |
static int ccs_update_network_entry(const u8 operation, const u8 record_type, |
454 |
const char *group_name, |
455 |
const u32 *min_address, |
456 |
const u32 *max_address, |
457 |
const u16 min_port, const u16 max_port, |
458 |
struct ccs_domain_info *domain, |
459 |
struct ccs_condition_list *condition, |
460 |
const bool is_delete) |
461 |
{ |
462 |
struct ccs_ip_network_acl_record *entry = NULL; |
463 |
struct ccs_acl_info *ptr; |
464 |
int error = is_delete ? -ENOENT : -ENOMEM; |
465 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
466 |
const u32 min_ip = ntohl(*min_address); |
467 |
const u32 max_ip = ntohl(*max_address); |
468 |
const struct in6_addr *saved_min_address = NULL; |
469 |
const struct in6_addr *saved_max_address = NULL; |
470 |
struct ccs_address_group_entry *group = NULL; |
471 |
if (!domain) |
472 |
return -EINVAL; |
473 |
if (group_name) { |
474 |
group = ccs_get_address_group(group_name); |
475 |
if (!group) |
476 |
return -ENOMEM; |
477 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
478 |
saved_min_address = ccs_get_ipv6_address((struct in6_addr *) |
479 |
min_address); |
480 |
saved_max_address = ccs_get_ipv6_address((struct in6_addr *) |
481 |
max_address); |
482 |
if (!saved_min_address || !saved_max_address) |
483 |
goto out; |
484 |
} |
485 |
if (is_delete) |
486 |
goto delete; |
487 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
488 |
/***** WRITER SECTION START *****/ |
489 |
down_write(&ccs_policy_lock); |
490 |
list_for_each_entry(ptr, &domain->acl_info_list, list) { |
491 |
struct ccs_ip_network_acl_record *acl; |
492 |
if (ccs_acl_type1(ptr) != TYPE_IP_NETWORK_ACL) |
493 |
continue; |
494 |
if (ptr->cond != condition) |
495 |
continue; |
496 |
acl = container_of(ptr, struct ccs_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 |
break; |
515 |
} |
516 |
if (error && ccs_memory_ok(entry)) { |
517 |
entry->head.type = TYPE_IP_NETWORK_ACL; |
518 |
entry->head.cond = condition; |
519 |
entry->operation_type = operation; |
520 |
entry->record_type = record_type; |
521 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
522 |
entry->u.group = group; |
523 |
group = NULL; |
524 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
525 |
entry->u.ipv4.min = min_ip; |
526 |
entry->u.ipv4.max = max_ip; |
527 |
} else { |
528 |
entry->u.ipv6.min = saved_min_address; |
529 |
saved_min_address = NULL; |
530 |
entry->u.ipv6.max = saved_max_address; |
531 |
saved_max_address = NULL; |
532 |
} |
533 |
entry->min_port = min_port; |
534 |
entry->max_port = max_port; |
535 |
error = ccs_add_domain_acl(domain, &entry->head); |
536 |
entry = NULL; |
537 |
} |
538 |
up_write(&ccs_policy_lock); |
539 |
/***** WRITER SECTION END *****/ |
540 |
goto out; |
541 |
delete: |
542 |
/***** WRITER SECTION START *****/ |
543 |
down_write(&ccs_policy_lock); |
544 |
list_for_each_entry(ptr, &domain->acl_info_list, list) { |
545 |
struct ccs_ip_network_acl_record *acl; |
546 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
547 |
continue; |
548 |
if (ptr->cond != condition) |
549 |
continue; |
550 |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
551 |
if (acl->operation_type != operation || |
552 |
acl->record_type != record_type || |
553 |
acl->min_port != min_port || max_port != acl->max_port) |
554 |
continue; |
555 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
556 |
if (acl->u.group != group) |
557 |
continue; |
558 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
559 |
if (acl->u.ipv4.min != min_ip || |
560 |
max_ip != acl->u.ipv4.max) |
561 |
continue; |
562 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
563 |
if (acl->u.ipv6.min != saved_min_address || |
564 |
saved_max_address != acl->u.ipv6.max) |
565 |
continue; |
566 |
} |
567 |
error = ccs_del_domain_acl(ptr); |
568 |
break; |
569 |
} |
570 |
up_write(&ccs_policy_lock); |
571 |
/***** WRITER SECTION END *****/ |
572 |
out: |
573 |
ccs_put_ipv6_address(saved_min_address); |
574 |
ccs_put_ipv6_address(saved_max_address); |
575 |
ccs_put_address_group(group); |
576 |
kfree(entry); |
577 |
return error; |
578 |
} |
579 |
|
580 |
/** |
581 |
* ccs_check_network_entry - Check permission for network operation. |
582 |
* |
583 |
* @is_ipv6: True if @address is an IPv6 address. |
584 |
* @operation: Type of operation. |
585 |
* @address: An IPv4 or IPv6 address. |
586 |
* @port: Port number. |
587 |
* |
588 |
* Returns 0 on success, negative value otherwise. |
589 |
*/ |
590 |
static int ccs_check_network_entry(const bool is_ipv6, const u8 operation, |
591 |
const u32 *address, const u16 port) |
592 |
{ |
593 |
struct ccs_request_info r; |
594 |
struct ccs_acl_info *ptr; |
595 |
const char *keyword = ccs_net2keyword(operation); |
596 |
bool is_enforce; |
597 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
598 |
const u32 ip = ntohl(*address); |
599 |
bool found = false; |
600 |
int error = -EPERM; |
601 |
char buf[64]; |
602 |
if (!ccs_can_sleep()) |
603 |
return 0; |
604 |
ccs_init_request_info(&r, NULL, CCS_MAC_FOR_NETWORK); |
605 |
is_enforce = (r.mode == 3); |
606 |
if (!r.mode) { |
607 |
error = 0; |
608 |
goto done; |
609 |
} |
610 |
retry: |
611 |
/***** READER SECTION START *****/ |
612 |
down_read(&ccs_policy_lock); |
613 |
list_for_each_entry(ptr, &r.cookie.u.domain->acl_info_list, list) { |
614 |
struct ccs_ip_network_acl_record *acl; |
615 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
616 |
continue; |
617 |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
618 |
if (acl->operation_type != operation || port < acl->min_port || |
619 |
acl->max_port < port || !ccs_check_condition(&r, ptr)) |
620 |
continue; |
621 |
if (acl->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
622 |
if (!ccs_address_matches_group(is_ipv6, address, |
623 |
acl->u.group)) |
624 |
continue; |
625 |
} else if (acl->record_type == IP_RECORD_TYPE_IPv4) { |
626 |
if (is_ipv6 || |
627 |
ip < acl->u.ipv4.min || acl->u.ipv4.max < ip) |
628 |
continue; |
629 |
} else { |
630 |
if (!is_ipv6 || |
631 |
memcmp(acl->u.ipv6.min, address, 16) > 0 || |
632 |
memcmp(address, acl->u.ipv6.max, 16) > 0) |
633 |
continue; |
634 |
} |
635 |
r.condition_cookie.u.cond = ptr->cond; |
636 |
found = true; |
637 |
break; |
638 |
} |
639 |
up_read(&ccs_policy_lock); |
640 |
/***** READER SECTION END *****/ |
641 |
memset(buf, 0, sizeof(buf)); |
642 |
if (is_ipv6) |
643 |
ccs_print_ipv6(buf, sizeof(buf), |
644 |
(const struct in6_addr *) address); |
645 |
else |
646 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
647 |
ccs_audit_network_log(&r, keyword, buf, port, found); |
648 |
if (found) { |
649 |
error = 0; |
650 |
goto done; |
651 |
} |
652 |
if (ccs_verbose_mode(r.cookie.u.domain)) |
653 |
printk(KERN_WARNING "TOMOYO-%s: %s to %s %u denied for %s\n", |
654 |
ccs_get_msg(is_enforce), keyword, buf, port, |
655 |
ccs_get_last_name(r.cookie.u.domain)); |
656 |
if (is_enforce) { |
657 |
int err = ccs_check_supervisor(&r, KEYWORD_ALLOW_NETWORK |
658 |
"%s %s %u\n", keyword, buf, |
659 |
port); |
660 |
if (err == 1) |
661 |
goto retry; |
662 |
error = err; |
663 |
goto done; |
664 |
} |
665 |
if (r.mode == 1 && ccs_domain_quota_ok(r.cookie.u.domain)) |
666 |
ccs_update_network_entry(operation, is_ipv6 ? |
667 |
IP_RECORD_TYPE_IPv6 : |
668 |
IP_RECORD_TYPE_IPv4, |
669 |
NULL, address, address, port, port, |
670 |
r.cookie.u.domain, ccs_handler_cond(), |
671 |
false); |
672 |
error = 0; |
673 |
done: |
674 |
ccs_exit_request_info(&r); |
675 |
return error; |
676 |
} |
677 |
|
678 |
/** |
679 |
* ccs_write_network_policy - Write "struct ccs_ip_network_acl_record" list. |
680 |
* |
681 |
* @data: String to parse. |
682 |
* @domain: Pointer to "struct ccs_domain_info". |
683 |
* @condition: Pointer to "struct ccs_condition_list". May be NULL. |
684 |
* @is_delete: True if it is a delete request. |
685 |
* |
686 |
* Returns 0 on success, negative value otherwise. |
687 |
*/ |
688 |
int ccs_write_network_policy(char *data, struct ccs_domain_info *domain, |
689 |
struct ccs_condition_list *condition, |
690 |
const bool is_delete) |
691 |
{ |
692 |
u8 sock_type; |
693 |
u8 operation; |
694 |
u8 record_type; |
695 |
u16 min_address[8]; |
696 |
u16 max_address[8]; |
697 |
const char *group_name = NULL; |
698 |
u16 min_port; |
699 |
u16 max_port; |
700 |
u8 count; |
701 |
char *cp1 = strchr(data, ' '); |
702 |
char *cp2; |
703 |
if (!cp1) |
704 |
goto out; |
705 |
cp1++; |
706 |
if (!strncmp(data, "TCP ", 4)) |
707 |
sock_type = SOCK_STREAM; |
708 |
else if (!strncmp(data, "UDP ", 4)) |
709 |
sock_type = SOCK_DGRAM; |
710 |
else if (!strncmp(data, "RAW ", 4)) |
711 |
sock_type = SOCK_RAW; |
712 |
else |
713 |
goto out; |
714 |
cp2 = strchr(cp1, ' '); |
715 |
if (!cp2) |
716 |
goto out; |
717 |
cp2++; |
718 |
if (!strncmp(cp1, "bind ", 5)) |
719 |
switch (sock_type) { |
720 |
case SOCK_STREAM: |
721 |
operation = NETWORK_ACL_TCP_BIND; |
722 |
break; |
723 |
case SOCK_DGRAM: |
724 |
operation = NETWORK_ACL_UDP_BIND; |
725 |
break; |
726 |
default: |
727 |
operation = NETWORK_ACL_RAW_BIND; |
728 |
} |
729 |
else if (!strncmp(cp1, "connect ", 8)) |
730 |
switch (sock_type) { |
731 |
case SOCK_STREAM: |
732 |
operation = NETWORK_ACL_TCP_CONNECT; |
733 |
break; |
734 |
case SOCK_DGRAM: |
735 |
operation = NETWORK_ACL_UDP_CONNECT; |
736 |
break; |
737 |
default: |
738 |
operation = NETWORK_ACL_RAW_CONNECT; |
739 |
} |
740 |
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "listen ", 7)) |
741 |
operation = NETWORK_ACL_TCP_LISTEN; |
742 |
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "accept ", 7)) |
743 |
operation = NETWORK_ACL_TCP_ACCEPT; |
744 |
else |
745 |
goto out; |
746 |
cp1 = strchr(cp2, ' '); |
747 |
if (!cp1) |
748 |
goto out; |
749 |
*cp1++ = '\0'; |
750 |
switch (ccs_parse_ip_address(cp2, min_address, max_address)) { |
751 |
case 2: |
752 |
record_type = IP_RECORD_TYPE_IPv6; |
753 |
break; |
754 |
case 1: |
755 |
record_type = IP_RECORD_TYPE_IPv4; |
756 |
break; |
757 |
default: |
758 |
if (*cp2 != '@') |
759 |
goto out; |
760 |
group_name = cp2 + 1; |
761 |
record_type = IP_RECORD_TYPE_ADDRESS_GROUP; |
762 |
break; |
763 |
} |
764 |
if (strchr(cp1, ' ')) |
765 |
goto out; |
766 |
count = sscanf(cp1, "%hu-%hu", &min_port, &max_port); |
767 |
if (count != 1 && count != 2) |
768 |
goto out; |
769 |
if (count == 1) |
770 |
max_port = min_port; |
771 |
return ccs_update_network_entry(operation, record_type, group_name, |
772 |
(u32 *) min_address, |
773 |
(u32 *) max_address, |
774 |
min_port, max_port, domain, condition, |
775 |
is_delete); |
776 |
out: |
777 |
return -EINVAL; |
778 |
} |
779 |
|
780 |
/** |
781 |
* ccs_check_network_listen_acl - Check permission for listen() operation. |
782 |
* |
783 |
* @is_ipv6: True if @address is an IPv6 address. |
784 |
* @address: An IPv4 or IPv6 address. |
785 |
* @port: Port number. |
786 |
* |
787 |
* Returns 0 on success, negative value otherwise. |
788 |
*/ |
789 |
static inline int ccs_check_network_listen_acl(const bool is_ipv6, |
790 |
const u8 *address, |
791 |
const u16 port) |
792 |
{ |
793 |
return ccs_check_network_entry(is_ipv6, NETWORK_ACL_TCP_LISTEN, |
794 |
(const u32 *) address, ntohs(port)); |
795 |
} |
796 |
|
797 |
/** |
798 |
* ccs_check_network_connect_acl - Check permission for connect() 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 |
static inline int ccs_check_network_connect_acl(const bool is_ipv6, |
808 |
const int sock_type, |
809 |
const u8 *address, |
810 |
const u16 port) |
811 |
{ |
812 |
u8 operation; |
813 |
switch (sock_type) { |
814 |
case SOCK_STREAM: |
815 |
operation = NETWORK_ACL_TCP_CONNECT; |
816 |
break; |
817 |
case SOCK_DGRAM: |
818 |
operation = NETWORK_ACL_UDP_CONNECT; |
819 |
break; |
820 |
default: |
821 |
operation = NETWORK_ACL_RAW_CONNECT; |
822 |
} |
823 |
return ccs_check_network_entry(is_ipv6, operation, |
824 |
(const u32 *) address, ntohs(port)); |
825 |
} |
826 |
|
827 |
/** |
828 |
* ccs_check_network_bind_acl - Check permission for bind() operation. |
829 |
* |
830 |
* @is_ipv6: True if @address is an IPv6 address. |
831 |
* @sock_type: Type of socket. (TCP or UDP or RAW) |
832 |
* @address: An IPv4 or IPv6 address. |
833 |
* @port: Port number. |
834 |
* |
835 |
* Returns 0 on success, negative value otherwise. |
836 |
*/ |
837 |
static int ccs_check_network_bind_acl(const bool is_ipv6, const int sock_type, |
838 |
const u8 *address, const u16 port) |
839 |
{ |
840 |
u8 operation; |
841 |
switch (sock_type) { |
842 |
case SOCK_STREAM: |
843 |
operation = NETWORK_ACL_TCP_BIND; |
844 |
break; |
845 |
case SOCK_DGRAM: |
846 |
operation = NETWORK_ACL_UDP_BIND; |
847 |
break; |
848 |
default: |
849 |
operation = NETWORK_ACL_RAW_BIND; |
850 |
} |
851 |
return ccs_check_network_entry(is_ipv6, operation, |
852 |
(const u32 *) address, ntohs(port)); |
853 |
} |
854 |
|
855 |
/** |
856 |
* ccs_check_network_accept_acl - Check permission for accept() operation. |
857 |
* |
858 |
* @is_ipv6: True if @address is an IPv6 address. |
859 |
* @address: An IPv4 or IPv6 address. |
860 |
* @port: Port number. |
861 |
* |
862 |
* Returns 0 on success, negative value otherwise. |
863 |
*/ |
864 |
static inline int ccs_check_network_accept_acl(const bool is_ipv6, |
865 |
const u8 *address, |
866 |
const u16 port) |
867 |
{ |
868 |
int retval; |
869 |
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
870 |
retval = ccs_check_network_entry(is_ipv6, NETWORK_ACL_TCP_ACCEPT, |
871 |
(const u32 *) address, ntohs(port)); |
872 |
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
873 |
return retval; |
874 |
} |
875 |
|
876 |
/** |
877 |
* ccs_check_network_sendmsg_acl - Check permission for sendmsg() operation. |
878 |
* |
879 |
* @is_ipv6: True if @address is an IPv6 address. |
880 |
* @sock_type: Type of socket. (UDP or RAW) |
881 |
* @address: An IPv4 or IPv6 address. |
882 |
* @port: Port number. |
883 |
* |
884 |
* Returns 0 on success, negative value otherwise. |
885 |
*/ |
886 |
static inline int ccs_check_network_sendmsg_acl(const bool is_ipv6, |
887 |
const int sock_type, |
888 |
const u8 *address, |
889 |
const u16 port) |
890 |
{ |
891 |
u8 operation; |
892 |
if (sock_type == SOCK_DGRAM) |
893 |
operation = NETWORK_ACL_UDP_CONNECT; |
894 |
else |
895 |
operation = NETWORK_ACL_RAW_CONNECT; |
896 |
return ccs_check_network_entry(is_ipv6, operation, |
897 |
(const u32 *) address, ntohs(port)); |
898 |
} |
899 |
|
900 |
/** |
901 |
* ccs_check_network_recvmsg_acl - Check permission for recvmsg() operation. |
902 |
* |
903 |
* @is_ipv6: True if @address is an IPv6 address. |
904 |
* @sock_type: Type of socket. (UDP or RAW) |
905 |
* @address: An IPv4 or IPv6 address. |
906 |
* @port: Port number. |
907 |
* |
908 |
* Returns 0 on success, negative value otherwise. |
909 |
*/ |
910 |
static inline int ccs_check_network_recvmsg_acl(const bool is_ipv6, |
911 |
const int sock_type, |
912 |
const u8 *address, |
913 |
const u16 port) |
914 |
{ |
915 |
int retval; |
916 |
const u8 operation |
917 |
= (sock_type == SOCK_DGRAM) ? |
918 |
NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT; |
919 |
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
920 |
retval = ccs_check_network_entry(is_ipv6, operation, |
921 |
(const u32 *) address, ntohs(port)); |
922 |
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
923 |
return retval; |
924 |
} |
925 |
|
926 |
#define MAX_SOCK_ADDR 128 /* net/socket.c */ |
927 |
|
928 |
/* Check permission for creating a socket. */ |
929 |
int ccs_socket_create_permission(int family, int type, int protocol) |
930 |
{ |
931 |
int error = 0; |
932 |
/* Nothing to do if I am a kernel service. */ |
933 |
if (segment_eq(get_fs(), KERNEL_DS)) |
934 |
return 0; |
935 |
if (family == PF_PACKET && !ccs_capable(CCS_USE_PACKET_SOCKET)) |
936 |
return -EPERM; |
937 |
if (family == PF_ROUTE && !ccs_capable(CCS_USE_ROUTE_SOCKET)) |
938 |
return -EPERM; |
939 |
if (family != PF_INET && family != PF_INET6) |
940 |
return 0; |
941 |
switch (type) { |
942 |
case SOCK_STREAM: |
943 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CREATE)) |
944 |
error = -EPERM; |
945 |
break; |
946 |
case SOCK_DGRAM: |
947 |
if (!ccs_capable(CCS_USE_INET_DGRAM_SOCKET)) |
948 |
error = -EPERM; |
949 |
break; |
950 |
case SOCK_RAW: |
951 |
if (!ccs_capable(CCS_USE_INET_RAW_SOCKET)) |
952 |
error = -EPERM; |
953 |
break; |
954 |
} |
955 |
return error; |
956 |
} |
957 |
|
958 |
/* Check permission for listening a TCP socket. */ |
959 |
int ccs_socket_listen_permission(struct socket *sock) |
960 |
{ |
961 |
int error = 0; |
962 |
char addr[MAX_SOCK_ADDR]; |
963 |
int addr_len; |
964 |
/* Nothing to do if I am a kernel service. */ |
965 |
if (segment_eq(get_fs(), KERNEL_DS)) |
966 |
return 0; |
967 |
if (sock->type != SOCK_STREAM) |
968 |
return 0; |
969 |
switch (sock->sk->sk_family) { |
970 |
case PF_INET: |
971 |
case PF_INET6: |
972 |
break; |
973 |
default: |
974 |
return 0; |
975 |
} |
976 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_LISTEN)) |
977 |
return -EPERM; |
978 |
if (sock->ops->getname(sock, (struct sockaddr *) addr, &addr_len, 0)) |
979 |
return -EPERM; |
980 |
switch (((struct sockaddr *) addr)->sa_family) { |
981 |
struct sockaddr_in6 *addr6; |
982 |
struct sockaddr_in *addr4; |
983 |
case AF_INET6: |
984 |
addr6 = (struct sockaddr_in6 *) addr; |
985 |
error = ccs_check_network_listen_acl(true, |
986 |
addr6->sin6_addr.s6_addr, |
987 |
addr6->sin6_port); |
988 |
break; |
989 |
case AF_INET: |
990 |
addr4 = (struct sockaddr_in *) addr; |
991 |
error = ccs_check_network_listen_acl(false, |
992 |
(u8 *) &addr4->sin_addr, |
993 |
addr4->sin_port); |
994 |
break; |
995 |
} |
996 |
return error; |
997 |
} |
998 |
|
999 |
/* Check permission for setting the remote IP address/port pair of a socket. */ |
1000 |
int ccs_socket_connect_permission(struct socket *sock, struct sockaddr *addr, |
1001 |
int addr_len) |
1002 |
{ |
1003 |
int error = 0; |
1004 |
const unsigned int type = sock->type; |
1005 |
/* Nothing to do if I am a kernel service. */ |
1006 |
if (segment_eq(get_fs(), KERNEL_DS)) |
1007 |
return 0; |
1008 |
switch (type) { |
1009 |
case SOCK_STREAM: |
1010 |
case SOCK_DGRAM: |
1011 |
case SOCK_RAW: |
1012 |
break; |
1013 |
default: |
1014 |
return 0; |
1015 |
} |
1016 |
switch (addr->sa_family) { |
1017 |
struct sockaddr_in6 *addr6; |
1018 |
struct sockaddr_in *addr4; |
1019 |
u16 port; |
1020 |
case AF_INET6: |
1021 |
if (addr_len < SIN6_LEN_RFC2133) |
1022 |
break; |
1023 |
addr6 = (struct sockaddr_in6 *) addr; |
1024 |
if (type != SOCK_RAW) |
1025 |
port = addr6->sin6_port; |
1026 |
else |
1027 |
port = htons(sock->sk->sk_protocol); |
1028 |
error = ccs_check_network_connect_acl(true, type, |
1029 |
addr6->sin6_addr.s6_addr, |
1030 |
port); |
1031 |
break; |
1032 |
case AF_INET: |
1033 |
if (addr_len < sizeof(struct sockaddr_in)) |
1034 |
break; |
1035 |
addr4 = (struct sockaddr_in *) addr; |
1036 |
if (type != SOCK_RAW) |
1037 |
port = addr4->sin_port; |
1038 |
else |
1039 |
port = htons(sock->sk->sk_protocol); |
1040 |
error = ccs_check_network_connect_acl(false, type, |
1041 |
(u8 *) &addr4->sin_addr, |
1042 |
port); |
1043 |
break; |
1044 |
} |
1045 |
if (type != SOCK_STREAM) |
1046 |
return error; |
1047 |
switch (sock->sk->sk_family) { |
1048 |
case PF_INET: |
1049 |
case PF_INET6: |
1050 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CONNECT)) |
1051 |
error = -EPERM; |
1052 |
break; |
1053 |
} |
1054 |
return error; |
1055 |
} |
1056 |
|
1057 |
/* Check permission for setting the local IP address/port pair of a socket. */ |
1058 |
int ccs_socket_bind_permission(struct socket *sock, struct sockaddr *addr, |
1059 |
int addr_len) |
1060 |
{ |
1061 |
int error = 0; |
1062 |
const unsigned int type = sock->type; |
1063 |
/* Nothing to do if I am a kernel service. */ |
1064 |
if (segment_eq(get_fs(), KERNEL_DS)) |
1065 |
return 0; |
1066 |
switch (type) { |
1067 |
case SOCK_STREAM: |
1068 |
case SOCK_DGRAM: |
1069 |
case SOCK_RAW: |
1070 |
break; |
1071 |
default: |
1072 |
return 0; |
1073 |
} |
1074 |
switch (addr->sa_family) { |
1075 |
struct sockaddr_in6 *addr6; |
1076 |
struct sockaddr_in *addr4; |
1077 |
u16 port; |
1078 |
case AF_INET6: |
1079 |
if (addr_len < SIN6_LEN_RFC2133) |
1080 |
break; |
1081 |
addr6 = (struct sockaddr_in6 *) addr; |
1082 |
if (type != SOCK_RAW) |
1083 |
port = addr6->sin6_port; |
1084 |
else |
1085 |
port = htons(sock->sk->sk_protocol); |
1086 |
error = ccs_check_network_bind_acl(true, type, |
1087 |
addr6->sin6_addr.s6_addr, |
1088 |
port); |
1089 |
break; |
1090 |
case AF_INET: |
1091 |
if (addr_len < sizeof(struct sockaddr_in)) |
1092 |
break; |
1093 |
addr4 = (struct sockaddr_in *) addr; |
1094 |
if (type != SOCK_RAW) |
1095 |
port = addr4->sin_port; |
1096 |
else |
1097 |
port = htons(sock->sk->sk_protocol); |
1098 |
error = ccs_check_network_bind_acl(false, type, |
1099 |
(u8 *) &addr4->sin_addr, |
1100 |
port); |
1101 |
break; |
1102 |
} |
1103 |
return error; |
1104 |
} |
1105 |
|
1106 |
/* |
1107 |
* Check permission for accepting a TCP socket. |
1108 |
* |
1109 |
* Currently, the LSM hook for this purpose is not provided. |
1110 |
*/ |
1111 |
int ccs_socket_accept_permission(struct socket *sock, struct sockaddr *addr) |
1112 |
{ |
1113 |
int error = 0; |
1114 |
int addr_len; |
1115 |
/* Nothing to do if I am a kernel service. */ |
1116 |
if (segment_eq(get_fs(), KERNEL_DS)) |
1117 |
return 0; |
1118 |
switch (sock->sk->sk_family) { |
1119 |
case PF_INET: |
1120 |
case PF_INET6: |
1121 |
break; |
1122 |
default: |
1123 |
return 0; |
1124 |
} |
1125 |
error = sock->ops->getname(sock, addr, &addr_len, 2); |
1126 |
if (error) |
1127 |
return error; |
1128 |
switch (addr->sa_family) { |
1129 |
struct sockaddr_in6 *addr6; |
1130 |
struct sockaddr_in *addr4; |
1131 |
case AF_INET6: |
1132 |
addr6 = (struct sockaddr_in6 *) addr; |
1133 |
error = ccs_check_network_accept_acl(true, |
1134 |
addr6->sin6_addr.s6_addr, |
1135 |
addr6->sin6_port); |
1136 |
break; |
1137 |
case AF_INET: |
1138 |
addr4 = (struct sockaddr_in *) addr; |
1139 |
error = ccs_check_network_accept_acl(false, |
1140 |
(u8 *) &addr4->sin_addr, |
1141 |
addr4->sin_port); |
1142 |
break; |
1143 |
} |
1144 |
return error; |
1145 |
} |
1146 |
|
1147 |
/* Check permission for sending a datagram via a UDP or RAW socket. */ |
1148 |
int ccs_socket_sendmsg_permission(struct socket *sock, struct sockaddr *addr, |
1149 |
int addr_len) |
1150 |
{ |
1151 |
int error = 0; |
1152 |
const int type = sock->type; |
1153 |
/* Nothing to do if I am a kernel service. */ |
1154 |
if (segment_eq(get_fs(), KERNEL_DS)) |
1155 |
return 0; |
1156 |
if (!addr || (type != SOCK_DGRAM && type != SOCK_RAW)) |
1157 |
return 0; |
1158 |
switch (addr->sa_family) { |
1159 |
struct sockaddr_in6 *addr6; |
1160 |
struct sockaddr_in *addr4; |
1161 |
u16 port; |
1162 |
case AF_INET6: |
1163 |
if (addr_len < SIN6_LEN_RFC2133) |
1164 |
break; |
1165 |
addr6 = (struct sockaddr_in6 *) addr; |
1166 |
if (type == SOCK_DGRAM) |
1167 |
port = addr6->sin6_port; |
1168 |
else |
1169 |
port = htons(sock->sk->sk_protocol); |
1170 |
error = ccs_check_network_sendmsg_acl(true, type, |
1171 |
addr6->sin6_addr.s6_addr, |
1172 |
port); |
1173 |
break; |
1174 |
case AF_INET: |
1175 |
if (addr_len < sizeof(struct sockaddr_in)) |
1176 |
break; |
1177 |
addr4 = (struct sockaddr_in *) addr; |
1178 |
if (type == SOCK_DGRAM) |
1179 |
port = addr4->sin_port; |
1180 |
else |
1181 |
port = htons(sock->sk->sk_protocol); |
1182 |
error = ccs_check_network_sendmsg_acl(false, type, |
1183 |
(u8 *) &addr4->sin_addr, |
1184 |
port); |
1185 |
break; |
1186 |
} |
1187 |
return error; |
1188 |
} |
1189 |
|
1190 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) |
1191 |
#if !defined(RHEL_MAJOR) || RHEL_MAJOR != 5 |
1192 |
|
1193 |
static inline struct iphdr *ip_hdr(const struct sk_buff *skb) |
1194 |
{ |
1195 |
return skb->nh.iph; |
1196 |
} |
1197 |
|
1198 |
static inline struct udphdr *udp_hdr(const struct sk_buff *skb) |
1199 |
{ |
1200 |
return skb->h.uh; |
1201 |
} |
1202 |
|
1203 |
static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) |
1204 |
{ |
1205 |
return skb->nh.ipv6h; |
1206 |
} |
1207 |
|
1208 |
#endif |
1209 |
#endif |
1210 |
|
1211 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 12) |
1212 |
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
1213 |
unsigned int flags) |
1214 |
{ |
1215 |
/* Clear queue. */ |
1216 |
if (flags & MSG_PEEK) { |
1217 |
int clear = 0; |
1218 |
spin_lock_irq(&sk->sk_receive_queue.lock); |
1219 |
if (skb == skb_peek(&sk->sk_receive_queue)) { |
1220 |
__skb_unlink(skb, &sk->sk_receive_queue); |
1221 |
clear = 1; |
1222 |
} |
1223 |
spin_unlock_irq(&sk->sk_receive_queue.lock); |
1224 |
if (clear) |
1225 |
kfree_skb(skb); |
1226 |
} |
1227 |
skb_free_datagram(sk, skb); |
1228 |
} |
1229 |
#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16) |
1230 |
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
1231 |
unsigned int flags) |
1232 |
{ |
1233 |
/* Clear queue. */ |
1234 |
if (flags & MSG_PEEK) { |
1235 |
int clear = 0; |
1236 |
spin_lock_bh(&sk->sk_receive_queue.lock); |
1237 |
if (skb == skb_peek(&sk->sk_receive_queue)) { |
1238 |
__skb_unlink(skb, &sk->sk_receive_queue); |
1239 |
clear = 1; |
1240 |
} |
1241 |
spin_unlock_bh(&sk->sk_receive_queue.lock); |
1242 |
if (clear) |
1243 |
kfree_skb(skb); |
1244 |
} |
1245 |
skb_free_datagram(sk, skb); |
1246 |
} |
1247 |
#endif |
1248 |
|
1249 |
/* |
1250 |
* Check permission for receiving a datagram via a UDP or RAW socket. |
1251 |
* |
1252 |
* Currently, the LSM hook for this purpose is not provided. |
1253 |
*/ |
1254 |
int ccs_socket_recvmsg_permission(struct sock *sk, struct sk_buff *skb, |
1255 |
const unsigned int flags) |
1256 |
{ |
1257 |
int error = 0; |
1258 |
const unsigned int type = sk->sk_type; |
1259 |
if (type != SOCK_DGRAM && type != SOCK_RAW) |
1260 |
return 0; |
1261 |
/* Nothing to do if I am a kernel service. */ |
1262 |
if (segment_eq(get_fs(), KERNEL_DS)) |
1263 |
return 0; |
1264 |
|
1265 |
switch (sk->sk_family) { |
1266 |
struct in6_addr sin6; |
1267 |
struct in_addr sin4; |
1268 |
u16 port; |
1269 |
case PF_INET6: |
1270 |
if (type == SOCK_DGRAM) { /* UDP IPv6 */ |
1271 |
if (skb->protocol == htons(ETH_P_IP)) { |
1272 |
ipv6_addr_set(&sin6, 0, 0, htonl(0xffff), |
1273 |
ip_hdr(skb)->saddr); |
1274 |
} else { |
1275 |
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
1276 |
} |
1277 |
port = udp_hdr(skb)->source; |
1278 |
} else { /* RAW IPv6 */ |
1279 |
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
1280 |
port = htons(sk->sk_protocol); |
1281 |
} |
1282 |
error = ccs_check_network_recvmsg_acl(true, type, |
1283 |
(u8 *) &sin6, port); |
1284 |
break; |
1285 |
case PF_INET: |
1286 |
if (type == SOCK_DGRAM) { /* UDP IPv4 */ |
1287 |
sin4.s_addr = ip_hdr(skb)->saddr; |
1288 |
port = udp_hdr(skb)->source; |
1289 |
} else { /* RAW IPv4 */ |
1290 |
sin4.s_addr = ip_hdr(skb)->saddr; |
1291 |
port = htons(sk->sk_protocol); |
1292 |
} |
1293 |
error = ccs_check_network_recvmsg_acl(false, type, |
1294 |
(u8 *) &sin4, port); |
1295 |
break; |
1296 |
} |
1297 |
if (!error) |
1298 |
return 0; |
1299 |
/* |
1300 |
* Remove from queue if MSG_PEEK is used so that |
1301 |
* the head message from unwanted source in receive queue will not |
1302 |
* prevent the caller from picking up next message from wanted source |
1303 |
* when the caller is using MSG_PEEK flag for picking up. |
1304 |
*/ |
1305 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1306 |
if (type == SOCK_DGRAM) |
1307 |
lock_sock(sk); |
1308 |
#endif |
1309 |
skb_kill_datagram(sk, skb, flags); |
1310 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1311 |
if (type == SOCK_DGRAM) |
1312 |
release_sock(sk); |
1313 |
#endif |
1314 |
/* Hope less harmful than -EPERM. */ |
1315 |
return -ENOMEM; |
1316 |
} |
1317 |
EXPORT_SYMBOL(ccs_socket_recvmsg_permission); |