1 |
kumaneko |
111 |
/* |
2 |
|
|
* fs/tomoyo_network.c |
3 |
|
|
* |
4 |
|
|
* Implementation of the Domain-Based Mandatory Access Control. |
5 |
|
|
* |
6 |
kumaneko |
2030 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
7 |
kumaneko |
111 |
* |
8 |
kumaneko |
2037 |
* Version: 1.6.6-pre 2009/01/05 |
9 |
kumaneko |
111 |
* |
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 |
kumaneko |
1084 |
#include <linux/net.h> |
19 |
|
|
#include <linux/inet.h> |
20 |
|
|
#include <linux/in.h> |
21 |
|
|
#include <linux/in6.h> |
22 |
kumaneko |
2037 |
#include <net/ip.h> |
23 |
|
|
#include <net/ipv6.h> |
24 |
|
|
#include <net/udp.h> |
25 |
kumaneko |
111 |
|
26 |
kumaneko |
2037 |
/* Index numbers for Network Controls. */ |
27 |
|
|
enum ccs_network_acl_index { |
28 |
|
|
NETWORK_ACL_UDP_BIND, |
29 |
|
|
NETWORK_ACL_UDP_CONNECT, |
30 |
|
|
NETWORK_ACL_TCP_BIND, |
31 |
|
|
NETWORK_ACL_TCP_LISTEN, |
32 |
|
|
NETWORK_ACL_TCP_CONNECT, |
33 |
|
|
NETWORK_ACL_TCP_ACCEPT, |
34 |
|
|
NETWORK_ACL_RAW_BIND, |
35 |
|
|
NETWORK_ACL_RAW_CONNECT |
36 |
|
|
}; |
37 |
|
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|
38 |
kumaneko |
1052 |
/** |
39 |
kumaneko |
2002 |
* ccs_audit_network_log - Audit network log. |
40 |
kumaneko |
1052 |
* |
41 |
kumaneko |
1657 |
* @r: Pointer to "struct ccs_request_info". |
42 |
kumaneko |
1052 |
* @operation: The name of operation. |
43 |
|
|
* @address: An IPv4 or IPv6 address. |
44 |
|
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* @port: Port number. |
45 |
|
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* @is_granted: True if this is a granted log. |
46 |
|
|
* |
47 |
|
|
* Returns 0 on success, negative value otherwise. |
48 |
|
|
*/ |
49 |
kumaneko |
2002 |
static int ccs_audit_network_log(struct ccs_request_info *r, |
50 |
|
|
const char *operation, const char *address, |
51 |
|
|
const u16 port, const bool is_granted) |
52 |
kumaneko |
111 |
{ |
53 |
kumaneko |
1657 |
return ccs_write_audit_log(is_granted, r, KEYWORD_ALLOW_NETWORK |
54 |
|
|
"%s %s %u\n", operation, address, port); |
55 |
kumaneko |
111 |
} |
56 |
|
|
|
57 |
kumaneko |
1052 |
/** |
58 |
kumaneko |
2002 |
* ccs_save_ipv6_address - Keep the given IPv6 address on the RAM. |
59 |
kumaneko |
1052 |
* |
60 |
|
|
* @addr: Pointer to "struct in6_addr". |
61 |
|
|
* |
62 |
|
|
* Returns pointer to "struct in6_addr" on success, NULL otherwise. |
63 |
|
|
* |
64 |
|
|
* The RAM is shared, so NEVER try to modify or kfree() the returned address. |
65 |
|
|
*/ |
66 |
kumaneko |
2002 |
static const struct in6_addr *ccs_save_ipv6_address(const struct in6_addr *addr) |
67 |
kumaneko |
719 |
{ |
68 |
kumaneko |
2002 |
static const u8 ccs_block_size = 16; |
69 |
|
|
struct ccs_addr_list { |
70 |
kumaneko |
1438 |
/* Workaround for gcc 4.3's bug. */ |
71 |
kumaneko |
2002 |
struct in6_addr addr[16]; /* = ccs_block_size */ |
72 |
kumaneko |
731 |
struct list1_head list; |
73 |
kumaneko |
719 |
u32 in_use_count; |
74 |
|
|
}; |
75 |
kumaneko |
2002 |
static LIST1_HEAD(ccs_address_list); |
76 |
|
|
struct ccs_addr_list *ptr; |
77 |
kumaneko |
719 |
static DEFINE_MUTEX(lock); |
78 |
kumaneko |
2002 |
u8 i = ccs_block_size; |
79 |
kumaneko |
1052 |
if (!addr) |
80 |
|
|
return NULL; |
81 |
kumaneko |
719 |
mutex_lock(&lock); |
82 |
kumaneko |
2002 |
list1_for_each_entry(ptr, &ccs_address_list, list) { |
83 |
kumaneko |
719 |
for (i = 0; i < ptr->in_use_count; i++) { |
84 |
kumaneko |
1064 |
if (!memcmp(&ptr->addr[i], addr, sizeof(*addr))) |
85 |
kumaneko |
1052 |
goto ok; |
86 |
kumaneko |
719 |
} |
87 |
kumaneko |
2002 |
if (i < ccs_block_size) |
88 |
kumaneko |
1052 |
break; |
89 |
kumaneko |
719 |
} |
90 |
kumaneko |
2002 |
if (i == ccs_block_size) { |
91 |
kumaneko |
1052 |
ptr = ccs_alloc_element(sizeof(*ptr)); |
92 |
|
|
if (!ptr) |
93 |
|
|
goto ok; |
94 |
kumaneko |
2002 |
list1_add_tail_mb(&ptr->list, &ccs_address_list); |
95 |
kumaneko |
719 |
i = 0; |
96 |
|
|
} |
97 |
kumaneko |
731 |
ptr->addr[ptr->in_use_count++] = *addr; |
98 |
kumaneko |
1052 |
ok: |
99 |
kumaneko |
719 |
mutex_unlock(&lock); |
100 |
|
|
return ptr ? &ptr->addr[i] : NULL; |
101 |
|
|
} |
102 |
|
|
|
103 |
kumaneko |
2002 |
/* The list for "struct ccs_address_group_entry". */ |
104 |
|
|
static LIST1_HEAD(ccs_address_group_list); |
105 |
kumaneko |
111 |
|
106 |
kumaneko |
1052 |
/** |
107 |
kumaneko |
2002 |
* ccs_update_address_group_entry - Update "struct ccs_address_group_entry" list. |
108 |
kumaneko |
1052 |
* |
109 |
kumaneko |
1064 |
* @group_name: The name of address group. |
110 |
|
|
* @is_ipv6: True if @min_address and @max_address are IPv6 addresses. |
111 |
kumaneko |
1052 |
* @min_address: Start of IPv4 or IPv6 address range. |
112 |
|
|
* @max_address: End of IPv4 or IPv6 address range. |
113 |
|
|
* @is_delete: True if it is a delete request. |
114 |
|
|
* |
115 |
|
|
* Returns 0 on success, negative value otherwise. |
116 |
|
|
*/ |
117 |
kumaneko |
2002 |
static int ccs_update_address_group_entry(const char *group_name, |
118 |
|
|
const bool is_ipv6, |
119 |
|
|
const u16 *min_address, |
120 |
|
|
const u16 *max_address, |
121 |
|
|
const bool is_delete) |
122 |
kumaneko |
111 |
{ |
123 |
kumaneko |
652 |
static DEFINE_MUTEX(lock); |
124 |
kumaneko |
2002 |
struct ccs_address_group_entry *new_group; |
125 |
|
|
struct ccs_address_group_entry *group; |
126 |
|
|
struct ccs_address_group_member *new_member; |
127 |
|
|
struct ccs_address_group_member *member; |
128 |
|
|
const struct ccs_path_info *saved_group_name; |
129 |
kumaneko |
1052 |
const struct in6_addr *saved_min_address = NULL; |
130 |
|
|
const struct in6_addr *saved_max_address = NULL; |
131 |
kumaneko |
111 |
int error = -ENOMEM; |
132 |
kumaneko |
1016 |
bool found = false; |
133 |
kumaneko |
1052 |
if (!ccs_is_correct_path(group_name, 0, 0, 0, __func__) || |
134 |
|
|
!group_name[0]) |
135 |
|
|
return -EINVAL; |
136 |
|
|
saved_group_name = ccs_save_name(group_name); |
137 |
|
|
if (!saved_group_name) |
138 |
|
|
return -ENOMEM; |
139 |
|
|
if (!is_ipv6) |
140 |
|
|
goto not_ipv6; |
141 |
|
|
saved_min_address |
142 |
kumaneko |
2002 |
= ccs_save_ipv6_address((struct in6_addr *) min_address); |
143 |
kumaneko |
1052 |
saved_max_address |
144 |
kumaneko |
2002 |
= ccs_save_ipv6_address((struct in6_addr *) max_address); |
145 |
kumaneko |
1052 |
if (!saved_min_address || !saved_max_address) |
146 |
|
|
return -ENOMEM; |
147 |
|
|
not_ipv6: |
148 |
kumaneko |
652 |
mutex_lock(&lock); |
149 |
kumaneko |
2002 |
list1_for_each_entry(group, &ccs_address_group_list, list) { |
150 |
kumaneko |
1052 |
if (saved_group_name != group->group_name) |
151 |
|
|
continue; |
152 |
kumaneko |
2002 |
list1_for_each_entry(member, |
153 |
|
|
&group->address_group_member_list, |
154 |
kumaneko |
1052 |
list) { |
155 |
|
|
if (member->is_ipv6 != is_ipv6) |
156 |
|
|
continue; |
157 |
kumaneko |
111 |
if (is_ipv6) { |
158 |
kumaneko |
1052 |
if (member->min.ipv6 != saved_min_address || |
159 |
|
|
member->max.ipv6 != saved_max_address) |
160 |
|
|
continue; |
161 |
kumaneko |
111 |
} else { |
162 |
kumaneko |
1052 |
if (member->min.ipv4 != *(u32 *) min_address || |
163 |
|
|
member->max.ipv4 != *(u32 *) max_address) |
164 |
|
|
continue; |
165 |
kumaneko |
111 |
} |
166 |
|
|
member->is_deleted = is_delete; |
167 |
|
|
error = 0; |
168 |
|
|
goto out; |
169 |
|
|
} |
170 |
kumaneko |
1016 |
found = true; |
171 |
kumaneko |
111 |
break; |
172 |
|
|
} |
173 |
|
|
if (is_delete) { |
174 |
|
|
error = -ENOENT; |
175 |
|
|
goto out; |
176 |
|
|
} |
177 |
kumaneko |
708 |
if (!found) { |
178 |
kumaneko |
1052 |
new_group = ccs_alloc_element(sizeof(*new_group)); |
179 |
|
|
if (!new_group) |
180 |
|
|
goto out; |
181 |
kumaneko |
722 |
INIT_LIST1_HEAD(&new_group->address_group_member_list); |
182 |
kumaneko |
111 |
new_group->group_name = saved_group_name; |
183 |
kumaneko |
2002 |
list1_add_tail_mb(&new_group->list, &ccs_address_group_list); |
184 |
kumaneko |
111 |
group = new_group; |
185 |
|
|
} |
186 |
kumaneko |
1052 |
new_member = ccs_alloc_element(sizeof(*new_member)); |
187 |
|
|
if (!new_member) |
188 |
|
|
goto out; |
189 |
kumaneko |
111 |
new_member->is_ipv6 = is_ipv6; |
190 |
|
|
if (is_ipv6) { |
191 |
kumaneko |
719 |
new_member->min.ipv6 = saved_min_address; |
192 |
|
|
new_member->max.ipv6 = saved_max_address; |
193 |
kumaneko |
111 |
} else { |
194 |
kumaneko |
1052 |
new_member->min.ipv4 = *(u32 *) min_address; |
195 |
|
|
new_member->max.ipv4 = *(u32 *) max_address; |
196 |
kumaneko |
111 |
} |
197 |
kumaneko |
2002 |
list1_add_tail_mb(&new_member->list, |
198 |
|
|
&group->address_group_member_list); |
199 |
kumaneko |
111 |
error = 0; |
200 |
|
|
out: |
201 |
kumaneko |
652 |
mutex_unlock(&lock); |
202 |
kumaneko |
1064 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
203 |
kumaneko |
111 |
return error; |
204 |
|
|
} |
205 |
|
|
|
206 |
kumaneko |
1052 |
/** |
207 |
kumaneko |
2002 |
* ccs_parse_ip_address - Parse an IP address. |
208 |
kumaneko |
1657 |
* |
209 |
|
|
* @address: String to parse. |
210 |
|
|
* @min: Pointer to store min address. |
211 |
|
|
* @max: Pointer to store max address. |
212 |
|
|
* |
213 |
|
|
* Returns 2 if @address is an IPv6, 1 if @address is an IPv4, 0 otherwise. |
214 |
|
|
*/ |
215 |
kumaneko |
2002 |
static int ccs_parse_ip_address(char *address, u16 *min, u16 *max) |
216 |
kumaneko |
1657 |
{ |
217 |
|
|
int count = sscanf(address, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx" |
218 |
|
|
"-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
219 |
|
|
&min[0], &min[1], &min[2], &min[3], |
220 |
|
|
&min[4], &min[5], &min[6], &min[7], |
221 |
|
|
&max[0], &max[1], &max[2], &max[3], |
222 |
|
|
&max[4], &max[5], &max[6], &max[7]); |
223 |
|
|
if (count == 8 || count == 16) { |
224 |
|
|
u8 i; |
225 |
|
|
if (count == 8) |
226 |
|
|
memmove(max, min, sizeof(u16) * 8); |
227 |
|
|
for (i = 0; i < 8; i++) { |
228 |
|
|
min[i] = htons(min[i]); |
229 |
|
|
max[i] = htons(max[i]); |
230 |
|
|
} |
231 |
|
|
return 2; |
232 |
|
|
} |
233 |
|
|
count = sscanf(address, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
234 |
|
|
&min[0], &min[1], &min[2], &min[3], |
235 |
|
|
&max[0], &max[1], &max[2], &max[3]); |
236 |
|
|
if (count == 4 || count == 8) { |
237 |
kumaneko |
1658 |
u32 ip = htonl((((u8) min[0]) << 24) + (((u8) min[1]) << 16) |
238 |
|
|
+ (((u8) min[2]) << 8) + (u8) min[3]); |
239 |
|
|
memmove(min, &ip, sizeof(ip)); |
240 |
|
|
if (count == 8) |
241 |
|
|
ip = htonl((((u8) max[0]) << 24) + (((u8) max[1]) << 16) |
242 |
|
|
+ (((u8) max[2]) << 8) + (u8) max[3]); |
243 |
|
|
memmove(max, &ip, sizeof(ip)); |
244 |
kumaneko |
1657 |
return 1; |
245 |
|
|
} |
246 |
|
|
return 0; |
247 |
|
|
} |
248 |
|
|
|
249 |
|
|
/** |
250 |
kumaneko |
2002 |
* ccs_write_address_group_policy - Write "struct ccs_address_group_entry" list. |
251 |
kumaneko |
1052 |
* |
252 |
|
|
* @data: String to parse. |
253 |
|
|
* @is_delete: True if it is a delete request. |
254 |
|
|
* |
255 |
|
|
* Returns 0 on success, negative value otherwise. |
256 |
|
|
*/ |
257 |
|
|
int ccs_write_address_group_policy(char *data, const bool is_delete) |
258 |
kumaneko |
111 |
{ |
259 |
kumaneko |
853 |
bool is_ipv6; |
260 |
kumaneko |
1064 |
u16 min_address[8]; |
261 |
|
|
u16 max_address[8]; |
262 |
kumaneko |
111 |
char *cp = strchr(data, ' '); |
263 |
kumaneko |
1052 |
if (!cp) |
264 |
|
|
return -EINVAL; |
265 |
kumaneko |
111 |
*cp++ = '\0'; |
266 |
kumaneko |
2002 |
switch (ccs_parse_ip_address(cp, min_address, max_address)) { |
267 |
kumaneko |
1657 |
case 2: |
268 |
kumaneko |
1016 |
is_ipv6 = true; |
269 |
kumaneko |
1657 |
break; |
270 |
|
|
case 1: |
271 |
kumaneko |
1016 |
is_ipv6 = false; |
272 |
kumaneko |
1657 |
break; |
273 |
|
|
default: |
274 |
|
|
return -EINVAL; |
275 |
kumaneko |
111 |
} |
276 |
kumaneko |
2002 |
return ccs_update_address_group_entry(data, is_ipv6, min_address, |
277 |
|
|
max_address, is_delete); |
278 |
kumaneko |
111 |
} |
279 |
|
|
|
280 |
kumaneko |
1052 |
/** |
281 |
kumaneko |
2002 |
* ccs_find_or_assign_new_address_group - Create address group. |
282 |
kumaneko |
1052 |
* |
283 |
kumaneko |
1064 |
* @group_name: The name of address group. |
284 |
kumaneko |
1052 |
* |
285 |
kumaneko |
2002 |
* Returns pointer to "struct ccs_address_group_entry" on success, |
286 |
|
|
* NULL otherwise. |
287 |
kumaneko |
1052 |
*/ |
288 |
kumaneko |
2002 |
static struct ccs_address_group_entry * |
289 |
|
|
ccs_find_or_assign_new_address_group(const char *group_name) |
290 |
kumaneko |
111 |
{ |
291 |
kumaneko |
853 |
u8 i; |
292 |
kumaneko |
2002 |
struct ccs_address_group_entry *group; |
293 |
kumaneko |
111 |
for (i = 0; i <= 1; i++) { |
294 |
kumaneko |
2002 |
list1_for_each_entry(group, &ccs_address_group_list, list) { |
295 |
kumaneko |
1064 |
if (!strcmp(group_name, group->group_name->name)) |
296 |
kumaneko |
1052 |
return group; |
297 |
kumaneko |
111 |
} |
298 |
kumaneko |
1064 |
if (!i) { |
299 |
kumaneko |
111 |
const u16 dummy[2] = { 0, 0 }; |
300 |
kumaneko |
2002 |
ccs_update_address_group_entry(group_name, false, |
301 |
|
|
dummy, dummy, false); |
302 |
|
|
ccs_update_address_group_entry(group_name, false, |
303 |
|
|
dummy, dummy, true); |
304 |
kumaneko |
111 |
} |
305 |
|
|
} |
306 |
|
|
return NULL; |
307 |
|
|
} |
308 |
|
|
|
309 |
kumaneko |
1052 |
/** |
310 |
kumaneko |
2002 |
* ccs_address_matches_to_group - Check whether the given address matches members of the given address group. |
311 |
kumaneko |
1052 |
* |
312 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
313 |
|
|
* @address: An IPv4 or IPv6 address. |
314 |
kumaneko |
2002 |
* @group: Pointer to "struct ccs_address_group_entry". |
315 |
kumaneko |
1052 |
* |
316 |
|
|
* Returns true if @address matches addresses in @group group, false otherwise. |
317 |
|
|
*/ |
318 |
kumaneko |
2002 |
static bool ccs_address_matches_to_group(const bool is_ipv6, const u32 *address, |
319 |
|
|
const struct ccs_address_group_entry * |
320 |
|
|
group) |
321 |
kumaneko |
111 |
{ |
322 |
kumaneko |
2002 |
struct ccs_address_group_member *member; |
323 |
kumaneko |
111 |
const u32 ip = ntohl(*address); |
324 |
kumaneko |
2002 |
list1_for_each_entry(member, &group->address_group_member_list, |
325 |
|
|
list) { |
326 |
kumaneko |
1052 |
if (member->is_deleted) |
327 |
|
|
continue; |
328 |
kumaneko |
111 |
if (member->is_ipv6) { |
329 |
kumaneko |
1052 |
if (is_ipv6 && |
330 |
|
|
memcmp(member->min.ipv6, address, 16) <= 0 && |
331 |
|
|
memcmp(address, member->max.ipv6, 16) <= 0) |
332 |
|
|
return true; |
333 |
kumaneko |
111 |
} else { |
334 |
kumaneko |
1052 |
if (!is_ipv6 && |
335 |
|
|
member->min.ipv4 <= ip && ip <= member->max.ipv4) |
336 |
|
|
return true; |
337 |
kumaneko |
111 |
} |
338 |
|
|
} |
339 |
kumaneko |
1016 |
return false; |
340 |
kumaneko |
111 |
} |
341 |
|
|
|
342 |
kumaneko |
1052 |
/** |
343 |
kumaneko |
2002 |
* ccs_read_address_group_policy - Read "struct ccs_address_group_entry" list. |
344 |
kumaneko |
1052 |
* |
345 |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
346 |
|
|
* |
347 |
|
|
* Returns true on success, false otherwise. |
348 |
|
|
*/ |
349 |
|
|
bool ccs_read_address_group_policy(struct ccs_io_buffer *head) |
350 |
kumaneko |
111 |
{ |
351 |
kumaneko |
722 |
struct list1_head *gpos; |
352 |
|
|
struct list1_head *mpos; |
353 |
kumaneko |
2002 |
list1_for_each_cookie(gpos, head->read_var1, &ccs_address_group_list) { |
354 |
|
|
struct ccs_address_group_entry *group; |
355 |
|
|
group = list1_entry(gpos, struct ccs_address_group_entry, list); |
356 |
kumaneko |
1052 |
list1_for_each_cookie(mpos, head->read_var2, |
357 |
|
|
&group->address_group_member_list) { |
358 |
kumaneko |
708 |
char buf[128]; |
359 |
kumaneko |
2002 |
struct ccs_address_group_member *member; |
360 |
|
|
member = list1_entry(mpos, |
361 |
|
|
struct ccs_address_group_member, |
362 |
kumaneko |
1052 |
list); |
363 |
|
|
if (member->is_deleted) |
364 |
|
|
continue; |
365 |
kumaneko |
1064 |
if (member->is_ipv6) { |
366 |
kumaneko |
1052 |
const struct in6_addr *min_address |
367 |
|
|
= member->min.ipv6; |
368 |
|
|
const struct in6_addr *max_address |
369 |
|
|
= member->max.ipv6; |
370 |
|
|
ccs_print_ipv6(buf, sizeof(buf), min_address); |
371 |
kumaneko |
719 |
if (min_address != max_address) { |
372 |
kumaneko |
1052 |
int len; |
373 |
kumaneko |
1795 |
char *cp = buf + strlen(buf); |
374 |
kumaneko |
708 |
*cp++ = '-'; |
375 |
kumaneko |
1052 |
len = strlen(buf); |
376 |
|
|
ccs_print_ipv6(cp, sizeof(buf) - len, |
377 |
|
|
max_address); |
378 |
kumaneko |
111 |
} |
379 |
kumaneko |
708 |
} else { |
380 |
kumaneko |
1052 |
const u32 min_address = member->min.ipv4; |
381 |
|
|
const u32 max_address = member->max.ipv4; |
382 |
kumaneko |
708 |
memset(buf, 0, sizeof(buf)); |
383 |
kumaneko |
1052 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", |
384 |
|
|
HIPQUAD(min_address)); |
385 |
kumaneko |
708 |
if (min_address != max_address) { |
386 |
|
|
const int len = strlen(buf); |
387 |
kumaneko |
1052 |
snprintf(buf + len, |
388 |
|
|
sizeof(buf) - 1 - len, |
389 |
|
|
"-%u.%u.%u.%u", |
390 |
|
|
HIPQUAD(max_address)); |
391 |
kumaneko |
708 |
} |
392 |
kumaneko |
111 |
} |
393 |
kumaneko |
1052 |
if (!ccs_io_printf(head, KEYWORD_ADDRESS_GROUP |
394 |
|
|
"%s %s\n", group->group_name->name, |
395 |
|
|
buf)) |
396 |
|
|
goto out; |
397 |
kumaneko |
111 |
} |
398 |
|
|
} |
399 |
kumaneko |
1052 |
return true; |
400 |
|
|
out: |
401 |
|
|
return false; |
402 |
kumaneko |
111 |
} |
403 |
|
|
|
404 |
kumaneko |
719 |
#if !defined(NIP6) |
405 |
kumaneko |
1052 |
#define NIP6(addr) \ |
406 |
kumaneko |
1056 |
ntohs((addr).s6_addr16[0]), ntohs((addr).s6_addr16[1]), \ |
407 |
|
|
ntohs((addr).s6_addr16[2]), ntohs((addr).s6_addr16[3]), \ |
408 |
|
|
ntohs((addr).s6_addr16[4]), ntohs((addr).s6_addr16[5]), \ |
409 |
|
|
ntohs((addr).s6_addr16[6]), ntohs((addr).s6_addr16[7]) |
410 |
kumaneko |
719 |
#endif |
411 |
|
|
|
412 |
kumaneko |
1052 |
/** |
413 |
kumaneko |
1054 |
* ccs_print_ipv6 - Print an IPv6 address. |
414 |
kumaneko |
1052 |
* |
415 |
|
|
* @buffer: Buffer to write to. |
416 |
kumaneko |
1064 |
* @buffer_len: Size of @buffer. |
417 |
kumaneko |
1052 |
* @ip: Pointer to "struct in6_addr". |
418 |
|
|
* |
419 |
kumaneko |
1064 |
* Returns nothing. |
420 |
kumaneko |
1052 |
*/ |
421 |
kumaneko |
1064 |
void ccs_print_ipv6(char *buffer, const int buffer_len, |
422 |
|
|
const struct in6_addr *ip) |
423 |
kumaneko |
111 |
{ |
424 |
|
|
memset(buffer, 0, buffer_len); |
425 |
kumaneko |
719 |
snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip)); |
426 |
kumaneko |
111 |
} |
427 |
|
|
|
428 |
kumaneko |
1052 |
/** |
429 |
|
|
* ccs_net2keyword - Convert network operation index to network operation name. |
430 |
|
|
* |
431 |
|
|
* @operation: Type of operation. |
432 |
|
|
* |
433 |
|
|
* Returns the name of operation. |
434 |
|
|
*/ |
435 |
|
|
const char *ccs_net2keyword(const u8 operation) |
436 |
kumaneko |
111 |
{ |
437 |
|
|
const char *keyword = "unknown"; |
438 |
|
|
switch (operation) { |
439 |
|
|
case NETWORK_ACL_UDP_BIND: |
440 |
|
|
keyword = "UDP bind"; |
441 |
|
|
break; |
442 |
|
|
case NETWORK_ACL_UDP_CONNECT: |
443 |
|
|
keyword = "UDP connect"; |
444 |
|
|
break; |
445 |
|
|
case NETWORK_ACL_TCP_BIND: |
446 |
|
|
keyword = "TCP bind"; |
447 |
|
|
break; |
448 |
|
|
case NETWORK_ACL_TCP_LISTEN: |
449 |
|
|
keyword = "TCP listen"; |
450 |
|
|
break; |
451 |
|
|
case NETWORK_ACL_TCP_CONNECT: |
452 |
|
|
keyword = "TCP connect"; |
453 |
|
|
break; |
454 |
|
|
case NETWORK_ACL_TCP_ACCEPT: |
455 |
|
|
keyword = "TCP accept"; |
456 |
|
|
break; |
457 |
|
|
case NETWORK_ACL_RAW_BIND: |
458 |
|
|
keyword = "RAW bind"; |
459 |
|
|
break; |
460 |
|
|
case NETWORK_ACL_RAW_CONNECT: |
461 |
|
|
keyword = "RAW connect"; |
462 |
|
|
break; |
463 |
|
|
} |
464 |
|
|
return keyword; |
465 |
|
|
} |
466 |
|
|
|
467 |
kumaneko |
1052 |
/** |
468 |
kumaneko |
2002 |
* ccs_update_network_entry - Update "struct ccs_ip_network_acl_record" list. |
469 |
kumaneko |
1052 |
* |
470 |
|
|
* @operation: Type of operation. |
471 |
|
|
* @record_type: Type of address. |
472 |
kumaneko |
2002 |
* @group: Pointer to "struct ccs_address_group_entry". May be NULL. |
473 |
kumaneko |
1052 |
* @min_address: Start of IPv4 or IPv6 address range. |
474 |
|
|
* @max_address: End of IPv4 or IPv6 address range. |
475 |
|
|
* @min_port: Start of port number range. |
476 |
|
|
* @max_port: End of port number range. |
477 |
|
|
* @domain: Pointer to "struct domain_info". |
478 |
kumaneko |
2002 |
* @condition: Pointer to "struct ccs_condition_list". May be NULL. |
479 |
kumaneko |
1052 |
* @is_delete: True if it is a delete request. |
480 |
|
|
* |
481 |
|
|
* Returns 0 on success, negative value otherwise. |
482 |
|
|
*/ |
483 |
kumaneko |
2002 |
static int ccs_update_network_entry(const u8 operation, const u8 record_type, |
484 |
|
|
const struct ccs_address_group_entry *group, |
485 |
|
|
const u32 *min_address, |
486 |
|
|
const u32 *max_address, |
487 |
|
|
const u16 min_port, const u16 max_port, |
488 |
|
|
struct domain_info *domain, |
489 |
|
|
const struct ccs_condition_list *condition, |
490 |
|
|
const bool is_delete) |
491 |
kumaneko |
111 |
{ |
492 |
kumaneko |
1695 |
static DEFINE_MUTEX(lock); |
493 |
kumaneko |
2002 |
struct ccs_acl_info *ptr; |
494 |
|
|
struct ccs_ip_network_acl_record *acl; |
495 |
kumaneko |
111 |
int error = -ENOMEM; |
496 |
kumaneko |
1052 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
497 |
|
|
const u32 min_ip = ntohl(*min_address); |
498 |
|
|
const u32 max_ip = ntohl(*max_address); |
499 |
|
|
const struct in6_addr *saved_min_address = NULL; |
500 |
|
|
const struct in6_addr *saved_max_address = NULL; |
501 |
|
|
if (!domain) |
502 |
|
|
return -EINVAL; |
503 |
|
|
if (record_type != IP_RECORD_TYPE_IPv6) |
504 |
|
|
goto not_ipv6; |
505 |
kumaneko |
2002 |
saved_min_address = ccs_save_ipv6_address((struct in6_addr *) |
506 |
|
|
min_address); |
507 |
|
|
saved_max_address = ccs_save_ipv6_address((struct in6_addr *) |
508 |
|
|
max_address); |
509 |
kumaneko |
1052 |
if (!saved_min_address || !saved_max_address) |
510 |
|
|
return -ENOMEM; |
511 |
|
|
not_ipv6: |
512 |
kumaneko |
1695 |
mutex_lock(&lock); |
513 |
kumaneko |
1052 |
if (is_delete) |
514 |
|
|
goto delete; |
515 |
|
|
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
516 |
kumaneko |
1064 |
if (ccs_acl_type1(ptr) != TYPE_IP_NETWORK_ACL) |
517 |
kumaneko |
1052 |
continue; |
518 |
|
|
if (ccs_get_condition_part(ptr) != condition) |
519 |
|
|
continue; |
520 |
kumaneko |
2002 |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
521 |
kumaneko |
1052 |
if (acl->operation_type != operation || |
522 |
|
|
acl->record_type != record_type || |
523 |
|
|
acl->min_port != min_port || max_port != acl->max_port) |
524 |
|
|
continue; |
525 |
kumaneko |
708 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
526 |
kumaneko |
1052 |
if (acl->u.group != group) |
527 |
|
|
continue; |
528 |
kumaneko |
708 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
529 |
kumaneko |
1052 |
if (acl->u.ipv4.min != min_ip || |
530 |
|
|
max_ip != acl->u.ipv4.max) |
531 |
|
|
continue; |
532 |
|
|
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
533 |
|
|
if (acl->u.ipv6.min != saved_min_address || |
534 |
|
|
saved_max_address != acl->u.ipv6.max) |
535 |
|
|
continue; |
536 |
kumaneko |
708 |
} |
537 |
kumaneko |
1052 |
error = ccs_add_domain_acl(NULL, ptr); |
538 |
|
|
goto out; |
539 |
|
|
} |
540 |
|
|
/* Not found. Append it to the tail. */ |
541 |
|
|
acl = ccs_alloc_acl_element(TYPE_IP_NETWORK_ACL, condition); |
542 |
|
|
if (!acl) |
543 |
|
|
goto out; |
544 |
|
|
acl->operation_type = operation; |
545 |
|
|
acl->record_type = record_type; |
546 |
|
|
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
547 |
|
|
acl->u.group = group; |
548 |
|
|
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
549 |
|
|
acl->u.ipv4.min = min_ip; |
550 |
|
|
acl->u.ipv4.max = max_ip; |
551 |
kumaneko |
111 |
} else { |
552 |
kumaneko |
1052 |
acl->u.ipv6.min = saved_min_address; |
553 |
|
|
acl->u.ipv6.max = saved_max_address; |
554 |
|
|
} |
555 |
|
|
acl->min_port = min_port; |
556 |
|
|
acl->max_port = max_port; |
557 |
|
|
error = ccs_add_domain_acl(domain, &acl->head); |
558 |
|
|
goto out; |
559 |
|
|
delete: |
560 |
|
|
error = -ENOENT; |
561 |
|
|
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
562 |
kumaneko |
1064 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
563 |
kumaneko |
1052 |
continue; |
564 |
|
|
if (ccs_get_condition_part(ptr) != condition) |
565 |
|
|
continue; |
566 |
kumaneko |
2002 |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
567 |
kumaneko |
1052 |
if (acl->operation_type != operation || |
568 |
|
|
acl->record_type != record_type || |
569 |
|
|
acl->min_port != min_port || max_port != acl->max_port) |
570 |
|
|
continue; |
571 |
|
|
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
572 |
|
|
if (acl->u.group != group) |
573 |
|
|
continue; |
574 |
|
|
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
575 |
|
|
if (acl->u.ipv4.min != min_ip || |
576 |
|
|
max_ip != acl->u.ipv4.max) |
577 |
|
|
continue; |
578 |
|
|
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
579 |
|
|
if (acl->u.ipv6.min != saved_min_address || |
580 |
|
|
saved_max_address != acl->u.ipv6.max) |
581 |
|
|
continue; |
582 |
kumaneko |
111 |
} |
583 |
kumaneko |
1052 |
error = ccs_del_domain_acl(ptr); |
584 |
|
|
break; |
585 |
kumaneko |
111 |
} |
586 |
kumaneko |
1052 |
out: |
587 |
kumaneko |
1695 |
mutex_unlock(&lock); |
588 |
kumaneko |
111 |
return error; |
589 |
|
|
} |
590 |
|
|
|
591 |
kumaneko |
1052 |
/** |
592 |
kumaneko |
2002 |
* ccs_check_network_entry - Check permission for network operation. |
593 |
kumaneko |
1052 |
* |
594 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
595 |
|
|
* @operation: Type of operation. |
596 |
|
|
* @address: An IPv4 or IPv6 address. |
597 |
|
|
* @port: Port number. |
598 |
|
|
* |
599 |
|
|
* Returns 0 on success, negative value otherwise. |
600 |
|
|
*/ |
601 |
kumaneko |
2002 |
static int ccs_check_network_entry(const bool is_ipv6, const u8 operation, |
602 |
|
|
const u32 *address, const u16 port) |
603 |
kumaneko |
111 |
{ |
604 |
kumaneko |
1657 |
struct ccs_request_info r; |
605 |
kumaneko |
2002 |
struct ccs_acl_info *ptr; |
606 |
kumaneko |
1052 |
const char *keyword = ccs_net2keyword(operation); |
607 |
kumaneko |
1657 |
bool is_enforce; |
608 |
kumaneko |
1052 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
609 |
|
|
const u32 ip = ntohl(*address); |
610 |
kumaneko |
1016 |
bool found = false; |
611 |
kumaneko |
1064 |
char buf[64]; |
612 |
kumaneko |
1657 |
if (!ccs_can_sleep()) |
613 |
kumaneko |
1052 |
return 0; |
614 |
kumaneko |
1657 |
ccs_init_request_info(&r, NULL, CCS_TOMOYO_MAC_FOR_NETWORK); |
615 |
|
|
is_enforce = (r.mode == 3); |
616 |
|
|
if (!r.mode) |
617 |
|
|
return 0; |
618 |
kumaneko |
2002 |
retry: |
619 |
kumaneko |
1657 |
list1_for_each_entry(ptr, &r.domain->acl_info_list, list) { |
620 |
kumaneko |
2002 |
struct ccs_ip_network_acl_record *acl; |
621 |
kumaneko |
1064 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
622 |
kumaneko |
1052 |
continue; |
623 |
kumaneko |
2002 |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
624 |
kumaneko |
1052 |
if (acl->operation_type != operation || port < acl->min_port || |
625 |
kumaneko |
1657 |
acl->max_port < port || !ccs_check_condition(&r, ptr)) |
626 |
kumaneko |
1052 |
continue; |
627 |
kumaneko |
708 |
if (acl->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
628 |
kumaneko |
2002 |
if (!ccs_address_matches_to_group(is_ipv6, address, |
629 |
|
|
acl->u.group)) |
630 |
kumaneko |
1052 |
continue; |
631 |
kumaneko |
708 |
} else if (acl->record_type == IP_RECORD_TYPE_IPv4) { |
632 |
kumaneko |
1052 |
if (is_ipv6 || |
633 |
|
|
ip < acl->u.ipv4.min || acl->u.ipv4.max < ip) |
634 |
|
|
continue; |
635 |
kumaneko |
111 |
} else { |
636 |
kumaneko |
1052 |
if (!is_ipv6 || |
637 |
|
|
memcmp(acl->u.ipv6.min, address, 16) > 0 || |
638 |
|
|
memcmp(address, acl->u.ipv6.max, 16) > 0) |
639 |
|
|
continue; |
640 |
kumaneko |
111 |
} |
641 |
kumaneko |
1782 |
r.cond = ccs_get_condition_part(ptr); |
642 |
kumaneko |
1016 |
found = true; |
643 |
kumaneko |
708 |
break; |
644 |
kumaneko |
111 |
} |
645 |
kumaneko |
1064 |
memset(buf, 0, sizeof(buf)); |
646 |
|
|
if (is_ipv6) |
647 |
|
|
ccs_print_ipv6(buf, sizeof(buf), |
648 |
|
|
(const struct in6_addr *) address); |
649 |
|
|
else |
650 |
|
|
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
651 |
kumaneko |
2002 |
ccs_audit_network_log(&r, keyword, buf, port, found); |
652 |
kumaneko |
1052 |
if (found) |
653 |
|
|
return 0; |
654 |
kumaneko |
1657 |
if (ccs_verbose_mode(r.domain)) |
655 |
kumaneko |
1064 |
printk(KERN_WARNING "TOMOYO-%s: %s to %s %u denied for %s\n", |
656 |
|
|
ccs_get_msg(is_enforce), keyword, buf, port, |
657 |
kumaneko |
1657 |
ccs_get_last_name(r.domain)); |
658 |
kumaneko |
1561 |
if (is_enforce) { |
659 |
kumaneko |
1657 |
int error = ccs_check_supervisor(&r, KEYWORD_ALLOW_NETWORK |
660 |
kumaneko |
1561 |
"%s %s %u\n", keyword, buf, |
661 |
|
|
port); |
662 |
kumaneko |
1781 |
if (error == 1) |
663 |
kumaneko |
1561 |
goto retry; |
664 |
|
|
return error; |
665 |
|
|
} |
666 |
kumaneko |
1657 |
if (r.mode == 1 && ccs_check_domain_quota(r.domain)) |
667 |
kumaneko |
2002 |
ccs_update_network_entry(operation, is_ipv6 ? |
668 |
|
|
IP_RECORD_TYPE_IPv6 : |
669 |
|
|
IP_RECORD_TYPE_IPv4, |
670 |
|
|
NULL, address, address, port, port, |
671 |
|
|
r.domain, ccs_handler_cond(), 0); |
672 |
kumaneko |
111 |
return 0; |
673 |
|
|
} |
674 |
|
|
|
675 |
kumaneko |
1052 |
/** |
676 |
kumaneko |
2002 |
* ccs_write_network_policy - Write "struct ccs_ip_network_acl_record" list. |
677 |
kumaneko |
1052 |
* |
678 |
|
|
* @data: String to parse. |
679 |
|
|
* @domain: Pointer to "struct domain_info". |
680 |
kumaneko |
2002 |
* @condition: Pointer to "struct ccs_condition_list". May be NULL. |
681 |
kumaneko |
1052 |
* @is_delete: True if it is a delete request. |
682 |
|
|
* |
683 |
|
|
* Returns 0 on success, negative value otherwise. |
684 |
|
|
*/ |
685 |
|
|
int ccs_write_network_policy(char *data, struct domain_info *domain, |
686 |
kumaneko |
2002 |
const struct ccs_condition_list *condition, |
687 |
kumaneko |
1052 |
const bool is_delete) |
688 |
kumaneko |
111 |
{ |
689 |
kumaneko |
1064 |
u8 sock_type; |
690 |
|
|
u8 operation; |
691 |
|
|
u8 record_type; |
692 |
|
|
u16 min_address[8]; |
693 |
|
|
u16 max_address[8]; |
694 |
kumaneko |
2002 |
struct ccs_address_group_entry *group = NULL; |
695 |
kumaneko |
1064 |
u16 min_port; |
696 |
|
|
u16 max_port; |
697 |
kumaneko |
853 |
u8 count; |
698 |
kumaneko |
1064 |
char *cp1 = strchr(data, ' '); |
699 |
|
|
char *cp2; |
700 |
kumaneko |
1052 |
if (!cp1) |
701 |
|
|
goto out; |
702 |
|
|
cp1++; |
703 |
|
|
if (!strncmp(data, "TCP ", 4)) |
704 |
|
|
sock_type = SOCK_STREAM; |
705 |
|
|
else if (!strncmp(data, "UDP ", 4)) |
706 |
|
|
sock_type = SOCK_DGRAM; |
707 |
|
|
else if (!strncmp(data, "RAW ", 4)) |
708 |
|
|
sock_type = SOCK_RAW; |
709 |
|
|
else |
710 |
|
|
goto out; |
711 |
|
|
cp2 = strchr(cp1, ' '); |
712 |
|
|
if (!cp2) |
713 |
|
|
goto out; |
714 |
|
|
cp2++; |
715 |
|
|
if (!strncmp(cp1, "bind ", 5)) |
716 |
|
|
switch (sock_type) { |
717 |
|
|
case SOCK_STREAM: |
718 |
|
|
operation = NETWORK_ACL_TCP_BIND; |
719 |
|
|
break; |
720 |
|
|
case SOCK_DGRAM: |
721 |
|
|
operation = NETWORK_ACL_UDP_BIND; |
722 |
|
|
break; |
723 |
|
|
default: |
724 |
|
|
operation = NETWORK_ACL_RAW_BIND; |
725 |
|
|
} |
726 |
|
|
else if (!strncmp(cp1, "connect ", 8)) |
727 |
|
|
switch (sock_type) { |
728 |
|
|
case SOCK_STREAM: |
729 |
|
|
operation = NETWORK_ACL_TCP_CONNECT; |
730 |
|
|
break; |
731 |
|
|
case SOCK_DGRAM: |
732 |
|
|
operation = NETWORK_ACL_UDP_CONNECT; |
733 |
|
|
break; |
734 |
|
|
default: |
735 |
|
|
operation = NETWORK_ACL_RAW_CONNECT; |
736 |
|
|
} |
737 |
|
|
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "listen ", 7)) |
738 |
kumaneko |
111 |
operation = NETWORK_ACL_TCP_LISTEN; |
739 |
kumaneko |
1052 |
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "accept ", 7)) |
740 |
kumaneko |
111 |
operation = NETWORK_ACL_TCP_ACCEPT; |
741 |
kumaneko |
1052 |
else |
742 |
kumaneko |
111 |
goto out; |
743 |
kumaneko |
1052 |
cp1 = strchr(cp2, ' '); |
744 |
|
|
if (!cp1) |
745 |
|
|
goto out; |
746 |
|
|
*cp1++ = '\0'; |
747 |
kumaneko |
2002 |
switch (ccs_parse_ip_address(cp2, min_address, max_address)) { |
748 |
kumaneko |
1657 |
case 2: |
749 |
kumaneko |
111 |
record_type = IP_RECORD_TYPE_IPv6; |
750 |
kumaneko |
1657 |
break; |
751 |
|
|
case 1: |
752 |
kumaneko |
111 |
record_type = IP_RECORD_TYPE_IPv4; |
753 |
kumaneko |
1657 |
break; |
754 |
|
|
default: |
755 |
|
|
if (*cp2 != '@') |
756 |
|
|
goto out; |
757 |
kumaneko |
2002 |
group = ccs_find_or_assign_new_address_group(cp2 + 1); |
758 |
kumaneko |
1052 |
if (!group) |
759 |
|
|
return -ENOMEM; |
760 |
kumaneko |
111 |
record_type = IP_RECORD_TYPE_ADDRESS_GROUP; |
761 |
kumaneko |
1657 |
break; |
762 |
kumaneko |
111 |
} |
763 |
kumaneko |
1052 |
if (strchr(cp1, ' ')) |
764 |
|
|
goto out; |
765 |
|
|
count = sscanf(cp1, "%hu-%hu", &min_port, &max_port); |
766 |
|
|
if (count != 1 && count != 2) |
767 |
|
|
goto out; |
768 |
|
|
if (count == 1) |
769 |
|
|
max_port = min_port; |
770 |
kumaneko |
2002 |
return ccs_update_network_entry(operation, record_type, group, |
771 |
|
|
(u32 *) min_address, |
772 |
|
|
(u32 *) max_address, |
773 |
|
|
min_port, max_port, domain, condition, |
774 |
|
|
is_delete); |
775 |
kumaneko |
1657 |
out: |
776 |
|
|
return -EINVAL; |
777 |
kumaneko |
111 |
} |
778 |
|
|
|
779 |
kumaneko |
1052 |
/** |
780 |
|
|
* ccs_check_network_listen_acl - Check permission for listen() operation. |
781 |
|
|
* |
782 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
783 |
|
|
* @address: An IPv4 or IPv6 address. |
784 |
|
|
* @port: Port number. |
785 |
|
|
* |
786 |
|
|
* Returns 0 on success, negative value otherwise. |
787 |
|
|
*/ |
788 |
kumaneko |
2037 |
static inline int ccs_check_network_listen_acl(const bool is_ipv6, |
789 |
|
|
const u8 *address, |
790 |
|
|
const u16 port) |
791 |
kumaneko |
111 |
{ |
792 |
kumaneko |
2002 |
return ccs_check_network_entry(is_ipv6, NETWORK_ACL_TCP_LISTEN, |
793 |
|
|
(const u32 *) address, ntohs(port)); |
794 |
kumaneko |
111 |
} |
795 |
|
|
|
796 |
kumaneko |
1052 |
/** |
797 |
|
|
* ccs_check_network_connect_acl - Check permission for connect() operation. |
798 |
|
|
* |
799 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
800 |
|
|
* @sock_type: Type of socket. (TCP or UDP or RAW) |
801 |
|
|
* @address: An IPv4 or IPv6 address. |
802 |
|
|
* @port: Port number. |
803 |
|
|
* |
804 |
|
|
* Returns 0 on success, negative value otherwise. |
805 |
|
|
*/ |
806 |
kumaneko |
2037 |
static inline int ccs_check_network_connect_acl(const bool is_ipv6, |
807 |
|
|
const int sock_type, |
808 |
|
|
const u8 *address, |
809 |
|
|
const u16 port) |
810 |
kumaneko |
111 |
{ |
811 |
kumaneko |
1052 |
u8 operation; |
812 |
|
|
switch (sock_type) { |
813 |
|
|
case SOCK_STREAM: |
814 |
|
|
operation = NETWORK_ACL_TCP_CONNECT; |
815 |
|
|
break; |
816 |
|
|
case SOCK_DGRAM: |
817 |
|
|
operation = NETWORK_ACL_UDP_CONNECT; |
818 |
|
|
break; |
819 |
|
|
default: |
820 |
|
|
operation = NETWORK_ACL_RAW_CONNECT; |
821 |
|
|
} |
822 |
kumaneko |
2002 |
return ccs_check_network_entry(is_ipv6, operation, |
823 |
|
|
(const u32 *) address, ntohs(port)); |
824 |
kumaneko |
111 |
} |
825 |
|
|
|
826 |
kumaneko |
1052 |
/** |
827 |
|
|
* ccs_check_network_bind_acl - Check permission for bind() operation. |
828 |
|
|
* |
829 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
830 |
|
|
* @sock_type: Type of socket. (TCP or UDP or RAW) |
831 |
|
|
* @address: An IPv4 or IPv6 address. |
832 |
|
|
* @port: Port number. |
833 |
|
|
* |
834 |
|
|
* Returns 0 on success, negative value otherwise. |
835 |
|
|
*/ |
836 |
kumaneko |
2037 |
static int ccs_check_network_bind_acl(const bool is_ipv6, const int sock_type, |
837 |
|
|
const u8 *address, const u16 port) |
838 |
kumaneko |
111 |
{ |
839 |
kumaneko |
1052 |
u8 operation; |
840 |
|
|
switch (sock_type) { |
841 |
|
|
case SOCK_STREAM: |
842 |
|
|
operation = NETWORK_ACL_TCP_BIND; |
843 |
|
|
break; |
844 |
|
|
case SOCK_DGRAM: |
845 |
|
|
operation = NETWORK_ACL_UDP_BIND; |
846 |
|
|
break; |
847 |
|
|
default: |
848 |
|
|
operation = NETWORK_ACL_RAW_BIND; |
849 |
|
|
} |
850 |
kumaneko |
2002 |
return ccs_check_network_entry(is_ipv6, operation, |
851 |
|
|
(const u32 *) address, ntohs(port)); |
852 |
kumaneko |
111 |
} |
853 |
|
|
|
854 |
kumaneko |
1052 |
/** |
855 |
|
|
* ccs_check_network_accept_acl - Check permission for accept() operation. |
856 |
|
|
* |
857 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
858 |
|
|
* @address: An IPv4 or IPv6 address. |
859 |
|
|
* @port: Port number. |
860 |
|
|
* |
861 |
|
|
* Returns 0 on success, negative value otherwise. |
862 |
|
|
*/ |
863 |
kumaneko |
2037 |
static inline int ccs_check_network_accept_acl(const bool is_ipv6, |
864 |
|
|
const u8 *address, |
865 |
|
|
const u16 port) |
866 |
kumaneko |
111 |
{ |
867 |
kumaneko |
708 |
int retval; |
868 |
|
|
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
869 |
kumaneko |
2002 |
retval = ccs_check_network_entry(is_ipv6, NETWORK_ACL_TCP_ACCEPT, |
870 |
|
|
(const u32 *) address, ntohs(port)); |
871 |
kumaneko |
708 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
872 |
|
|
return retval; |
873 |
kumaneko |
111 |
} |
874 |
|
|
|
875 |
kumaneko |
1052 |
/** |
876 |
|
|
* ccs_check_network_sendmsg_acl - Check permission for sendmsg() operation. |
877 |
|
|
* |
878 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
879 |
|
|
* @sock_type: Type of socket. (UDP or RAW) |
880 |
|
|
* @address: An IPv4 or IPv6 address. |
881 |
|
|
* @port: Port number. |
882 |
|
|
* |
883 |
|
|
* Returns 0 on success, negative value otherwise. |
884 |
|
|
*/ |
885 |
kumaneko |
2037 |
static inline int ccs_check_network_sendmsg_acl(const bool is_ipv6, |
886 |
|
|
const int sock_type, |
887 |
|
|
const u8 *address, |
888 |
|
|
const u16 port) |
889 |
kumaneko |
111 |
{ |
890 |
kumaneko |
1052 |
u8 operation; |
891 |
|
|
if (sock_type == SOCK_DGRAM) |
892 |
|
|
operation = NETWORK_ACL_UDP_CONNECT; |
893 |
|
|
else |
894 |
|
|
operation = NETWORK_ACL_RAW_CONNECT; |
895 |
kumaneko |
2002 |
return ccs_check_network_entry(is_ipv6, operation, |
896 |
|
|
(const u32 *) address, ntohs(port)); |
897 |
kumaneko |
111 |
} |
898 |
|
|
|
899 |
kumaneko |
1052 |
/** |
900 |
|
|
* ccs_check_network_recvmsg_acl - Check permission for recvmsg() operation. |
901 |
|
|
* |
902 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
903 |
|
|
* @sock_type: Type of socket. (UDP or RAW) |
904 |
|
|
* @address: An IPv4 or IPv6 address. |
905 |
|
|
* @port: Port number. |
906 |
|
|
* |
907 |
|
|
* Returns 0 on success, negative value otherwise. |
908 |
|
|
*/ |
909 |
kumaneko |
2037 |
static inline int ccs_check_network_recvmsg_acl(const bool is_ipv6, |
910 |
|
|
const int sock_type, |
911 |
|
|
const u8 *address, |
912 |
|
|
const u16 port) |
913 |
kumaneko |
111 |
{ |
914 |
kumaneko |
708 |
int retval; |
915 |
kumaneko |
1052 |
const u8 operation |
916 |
kumaneko |
1064 |
= (sock_type == SOCK_DGRAM) ? |
917 |
kumaneko |
1052 |
NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT; |
918 |
kumaneko |
708 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
919 |
kumaneko |
2002 |
retval = ccs_check_network_entry(is_ipv6, operation, |
920 |
|
|
(const u32 *) address, ntohs(port)); |
921 |
kumaneko |
708 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
922 |
|
|
return retval; |
923 |
kumaneko |
111 |
} |
924 |
kumaneko |
2037 |
|
925 |
|
|
#define MAX_SOCK_ADDR 128 /* net/socket.c */ |
926 |
|
|
|
927 |
|
|
/* Check permission for creating a socket. */ |
928 |
|
|
int ccs_socket_create_permission(int family, int type, int protocol) |
929 |
|
|
{ |
930 |
|
|
int error = 0; |
931 |
|
|
/* Nothing to do if I am a kernel service. */ |
932 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
933 |
|
|
return 0; |
934 |
|
|
if (family == PF_PACKET && !ccs_capable(TOMOYO_USE_PACKET_SOCKET)) |
935 |
|
|
return -EPERM; |
936 |
|
|
if (family == PF_ROUTE && !ccs_capable(TOMOYO_USE_ROUTE_SOCKET)) |
937 |
|
|
return -EPERM; |
938 |
|
|
if (family != PF_INET && family != PF_INET6) |
939 |
|
|
return 0; |
940 |
|
|
switch (type) { |
941 |
|
|
case SOCK_STREAM: |
942 |
|
|
if (!ccs_capable(TOMOYO_INET_STREAM_SOCKET_CREATE)) |
943 |
|
|
error = -EPERM; |
944 |
|
|
break; |
945 |
|
|
case SOCK_DGRAM: |
946 |
|
|
if (!ccs_capable(TOMOYO_USE_INET_DGRAM_SOCKET)) |
947 |
|
|
error = -EPERM; |
948 |
|
|
break; |
949 |
|
|
case SOCK_RAW: |
950 |
|
|
if (!ccs_capable(TOMOYO_USE_INET_RAW_SOCKET)) |
951 |
|
|
error = -EPERM; |
952 |
|
|
break; |
953 |
|
|
} |
954 |
|
|
return error; |
955 |
|
|
} |
956 |
|
|
|
957 |
|
|
/* Check permission for listening a TCP socket. */ |
958 |
|
|
int ccs_socket_listen_permission(struct socket *sock) |
959 |
|
|
{ |
960 |
|
|
int error = 0; |
961 |
|
|
char addr[MAX_SOCK_ADDR]; |
962 |
|
|
int addr_len; |
963 |
|
|
/* Nothing to do if I am a kernel service. */ |
964 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
965 |
|
|
return 0; |
966 |
|
|
if (sock->type != SOCK_STREAM) |
967 |
|
|
return 0; |
968 |
|
|
switch (sock->sk->sk_family) { |
969 |
|
|
case PF_INET: |
970 |
|
|
case PF_INET6: |
971 |
|
|
break; |
972 |
|
|
default: |
973 |
|
|
return 0; |
974 |
|
|
} |
975 |
|
|
if (!ccs_capable(TOMOYO_INET_STREAM_SOCKET_LISTEN)) |
976 |
|
|
return -EPERM; |
977 |
|
|
if (sock->ops->getname(sock, (struct sockaddr *) addr, &addr_len, 0)) |
978 |
|
|
return -EPERM; |
979 |
|
|
switch (((struct sockaddr *) addr)->sa_family) { |
980 |
|
|
struct sockaddr_in6 *addr6; |
981 |
|
|
struct sockaddr_in *addr4; |
982 |
|
|
case AF_INET6: |
983 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
984 |
|
|
error = ccs_check_network_listen_acl(true, |
985 |
|
|
addr6->sin6_addr.s6_addr, |
986 |
|
|
addr6->sin6_port); |
987 |
|
|
break; |
988 |
|
|
case AF_INET: |
989 |
|
|
addr4 = (struct sockaddr_in *) addr; |
990 |
|
|
error = ccs_check_network_listen_acl(false, |
991 |
|
|
(u8 *) &addr4->sin_addr, |
992 |
|
|
addr4->sin_port); |
993 |
|
|
break; |
994 |
|
|
} |
995 |
|
|
return error; |
996 |
|
|
} |
997 |
|
|
|
998 |
|
|
/* Check permission for setting the remote IP address/port pair of a socket. */ |
999 |
|
|
int ccs_socket_connect_permission(struct socket *sock, struct sockaddr *addr, |
1000 |
|
|
int addr_len) |
1001 |
|
|
{ |
1002 |
|
|
int error = 0; |
1003 |
|
|
const unsigned int type = sock->type; |
1004 |
|
|
/* Nothing to do if I am a kernel service. */ |
1005 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1006 |
|
|
return 0; |
1007 |
|
|
switch (type) { |
1008 |
|
|
case SOCK_STREAM: |
1009 |
|
|
case SOCK_DGRAM: |
1010 |
|
|
case SOCK_RAW: |
1011 |
|
|
break; |
1012 |
|
|
default: |
1013 |
|
|
return 0; |
1014 |
|
|
} |
1015 |
|
|
switch (addr->sa_family) { |
1016 |
|
|
struct sockaddr_in6 *addr6; |
1017 |
|
|
struct sockaddr_in *addr4; |
1018 |
|
|
u16 port; |
1019 |
|
|
case AF_INET6: |
1020 |
|
|
if (addr_len < SIN6_LEN_RFC2133) |
1021 |
|
|
break; |
1022 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
1023 |
|
|
if (type != SOCK_RAW) |
1024 |
|
|
port = addr6->sin6_port; |
1025 |
|
|
else |
1026 |
|
|
port = htons(sock->sk->sk_protocol); |
1027 |
|
|
error = ccs_check_network_connect_acl(true, type, |
1028 |
|
|
addr6->sin6_addr.s6_addr, |
1029 |
|
|
port); |
1030 |
|
|
break; |
1031 |
|
|
case AF_INET: |
1032 |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
1033 |
|
|
break; |
1034 |
|
|
addr4 = (struct sockaddr_in *) addr; |
1035 |
|
|
if (type != SOCK_RAW) |
1036 |
|
|
port = addr4->sin_port; |
1037 |
|
|
else |
1038 |
|
|
port = htons(sock->sk->sk_protocol); |
1039 |
|
|
error = ccs_check_network_connect_acl(false, type, |
1040 |
|
|
(u8 *) &addr4->sin_addr, |
1041 |
|
|
port); |
1042 |
|
|
break; |
1043 |
|
|
} |
1044 |
|
|
if (type != SOCK_STREAM) |
1045 |
|
|
return error; |
1046 |
|
|
switch (sock->sk->sk_family) { |
1047 |
|
|
case PF_INET: |
1048 |
|
|
case PF_INET6: |
1049 |
|
|
if (!ccs_capable(TOMOYO_INET_STREAM_SOCKET_CONNECT)) |
1050 |
|
|
error = -EPERM; |
1051 |
|
|
break; |
1052 |
|
|
} |
1053 |
|
|
return error; |
1054 |
|
|
} |
1055 |
|
|
|
1056 |
|
|
/* Check permission for setting the local IP address/port pair of a socket. */ |
1057 |
|
|
int ccs_socket_bind_permission(struct socket *sock, struct sockaddr *addr, |
1058 |
|
|
int addr_len) |
1059 |
|
|
{ |
1060 |
|
|
int error = 0; |
1061 |
|
|
const unsigned int type = sock->type; |
1062 |
|
|
/* Nothing to do if I am a kernel service. */ |
1063 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1064 |
|
|
return 0; |
1065 |
|
|
switch (type) { |
1066 |
|
|
case SOCK_STREAM: |
1067 |
|
|
case SOCK_DGRAM: |
1068 |
|
|
case SOCK_RAW: |
1069 |
|
|
break; |
1070 |
|
|
default: |
1071 |
|
|
return 0; |
1072 |
|
|
} |
1073 |
|
|
switch (addr->sa_family) { |
1074 |
|
|
struct sockaddr_in6 *addr6; |
1075 |
|
|
struct sockaddr_in *addr4; |
1076 |
|
|
u16 port; |
1077 |
|
|
case AF_INET6: |
1078 |
|
|
if (addr_len < SIN6_LEN_RFC2133) |
1079 |
|
|
break; |
1080 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
1081 |
|
|
if (type != SOCK_RAW) |
1082 |
|
|
port = addr6->sin6_port; |
1083 |
|
|
else |
1084 |
|
|
port = htons(sock->sk->sk_protocol); |
1085 |
|
|
error = ccs_check_network_bind_acl(true, type, |
1086 |
|
|
addr6->sin6_addr.s6_addr, |
1087 |
|
|
port); |
1088 |
|
|
break; |
1089 |
|
|
case AF_INET: |
1090 |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
1091 |
|
|
break; |
1092 |
|
|
addr4 = (struct sockaddr_in *) addr; |
1093 |
|
|
if (type != SOCK_RAW) |
1094 |
|
|
port = addr4->sin_port; |
1095 |
|
|
else |
1096 |
|
|
port = htons(sock->sk->sk_protocol); |
1097 |
|
|
error = ccs_check_network_bind_acl(false, type, |
1098 |
|
|
(u8 *) &addr4->sin_addr, |
1099 |
|
|
port); |
1100 |
|
|
break; |
1101 |
|
|
} |
1102 |
|
|
return error; |
1103 |
|
|
} |
1104 |
|
|
|
1105 |
|
|
/* |
1106 |
|
|
* Check permission for accepting a TCP socket. |
1107 |
|
|
* |
1108 |
|
|
* Currently, the LSM hook for this purpose is not provided. |
1109 |
|
|
*/ |
1110 |
|
|
int ccs_socket_accept_permission(struct socket *sock, struct sockaddr *addr) |
1111 |
|
|
{ |
1112 |
|
|
int error = 0; |
1113 |
|
|
int addr_len; |
1114 |
|
|
/* Nothing to do if I am a kernel service. */ |
1115 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1116 |
|
|
return 0; |
1117 |
|
|
switch (sock->sk->sk_family) { |
1118 |
|
|
case PF_INET: |
1119 |
|
|
case PF_INET6: |
1120 |
|
|
break; |
1121 |
|
|
default: |
1122 |
|
|
return 0; |
1123 |
|
|
} |
1124 |
|
|
error = sock->ops->getname(sock, addr, &addr_len, 2); |
1125 |
|
|
if (error) |
1126 |
|
|
return error; |
1127 |
|
|
switch (addr->sa_family) { |
1128 |
|
|
struct sockaddr_in6 *addr6; |
1129 |
|
|
struct sockaddr_in *addr4; |
1130 |
|
|
case AF_INET6: |
1131 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
1132 |
|
|
error = ccs_check_network_accept_acl(true, |
1133 |
|
|
addr6->sin6_addr.s6_addr, |
1134 |
|
|
addr6->sin6_port); |
1135 |
|
|
break; |
1136 |
|
|
case AF_INET: |
1137 |
|
|
addr4 = (struct sockaddr_in *) addr; |
1138 |
|
|
error = ccs_check_network_accept_acl(false, |
1139 |
|
|
(u8 *) &addr4->sin_addr, |
1140 |
|
|
addr4->sin_port); |
1141 |
|
|
break; |
1142 |
|
|
} |
1143 |
|
|
return error; |
1144 |
|
|
} |
1145 |
|
|
|
1146 |
|
|
/* Check permission for sending a datagram via a UDP or RAW socket. */ |
1147 |
|
|
int ccs_socket_sendmsg_permission(struct socket *sock, struct sockaddr *addr, |
1148 |
|
|
int addr_len) |
1149 |
|
|
{ |
1150 |
|
|
int error = 0; |
1151 |
|
|
const int type = sock->type; |
1152 |
|
|
/* Nothing to do if I am a kernel service. */ |
1153 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1154 |
|
|
return 0; |
1155 |
|
|
if (!addr || (type != SOCK_DGRAM && type != SOCK_RAW)) |
1156 |
|
|
return 0; |
1157 |
|
|
switch (addr->sa_family) { |
1158 |
|
|
struct sockaddr_in6 *addr6; |
1159 |
|
|
struct sockaddr_in *addr4; |
1160 |
|
|
u16 port; |
1161 |
|
|
case AF_INET6: |
1162 |
|
|
if (addr_len < SIN6_LEN_RFC2133) |
1163 |
|
|
break; |
1164 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
1165 |
|
|
if (type == SOCK_DGRAM) |
1166 |
|
|
port = addr6->sin6_port; |
1167 |
|
|
else |
1168 |
|
|
port = htons(sock->sk->sk_protocol); |
1169 |
|
|
error = ccs_check_network_sendmsg_acl(true, type, |
1170 |
|
|
addr6->sin6_addr.s6_addr, |
1171 |
|
|
port); |
1172 |
|
|
break; |
1173 |
|
|
case AF_INET: |
1174 |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
1175 |
|
|
break; |
1176 |
|
|
addr4 = (struct sockaddr_in *) addr; |
1177 |
|
|
if (type == SOCK_DGRAM) |
1178 |
|
|
port = addr4->sin_port; |
1179 |
|
|
else |
1180 |
|
|
port = htons(sock->sk->sk_protocol); |
1181 |
|
|
error = ccs_check_network_sendmsg_acl(false, type, |
1182 |
|
|
(u8 *) &addr4->sin_addr, |
1183 |
|
|
port); |
1184 |
|
|
break; |
1185 |
|
|
} |
1186 |
|
|
return error; |
1187 |
|
|
} |
1188 |
|
|
|
1189 |
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) |
1190 |
|
|
#if !defined(RHEL_MAJOR) || RHEL_MAJOR != 5 |
1191 |
|
|
|
1192 |
|
|
static inline struct iphdr *ip_hdr(const struct sk_buff *skb) |
1193 |
|
|
{ |
1194 |
|
|
return skb->nh.iph; |
1195 |
|
|
} |
1196 |
|
|
|
1197 |
|
|
static inline struct udphdr *udp_hdr(const struct sk_buff *skb) |
1198 |
|
|
{ |
1199 |
|
|
return skb->h.uh; |
1200 |
|
|
} |
1201 |
|
|
|
1202 |
|
|
static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) |
1203 |
|
|
{ |
1204 |
|
|
return skb->nh.ipv6h; |
1205 |
|
|
} |
1206 |
|
|
|
1207 |
|
|
#endif |
1208 |
|
|
#endif |
1209 |
|
|
|
1210 |
|
|
/* |
1211 |
|
|
* Check permission for receiving a datagram via a UDP or RAW socket. |
1212 |
|
|
* |
1213 |
|
|
* Currently, the LSM hook for this purpose is not provided. |
1214 |
|
|
*/ |
1215 |
|
|
int ccs_socket_recv_datagram_permission(struct sock *sk, struct sk_buff *skb, |
1216 |
|
|
const unsigned int flags) |
1217 |
|
|
{ |
1218 |
|
|
int error = 0; |
1219 |
|
|
const unsigned int type = sk->sk_type; |
1220 |
|
|
/* Nothing to do if I didn't receive a datagram. */ |
1221 |
|
|
if (!skb) |
1222 |
|
|
return 0; |
1223 |
|
|
/* Nothing to do if I can't sleep. */ |
1224 |
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) |
1225 |
|
|
if (in_interrupt()) |
1226 |
|
|
return 0; |
1227 |
|
|
#else |
1228 |
|
|
if (in_atomic()) |
1229 |
|
|
return 0; |
1230 |
|
|
#endif |
1231 |
|
|
/* Nothing to do if I am a kernel service. */ |
1232 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1233 |
|
|
return 0; |
1234 |
|
|
if (type != SOCK_DGRAM && type != SOCK_RAW) |
1235 |
|
|
return 0; |
1236 |
|
|
|
1237 |
|
|
switch (sk->sk_family) { |
1238 |
|
|
struct in6_addr sin6; |
1239 |
|
|
struct in_addr sin4; |
1240 |
|
|
u16 port; |
1241 |
|
|
case PF_INET6: |
1242 |
|
|
if (type == SOCK_DGRAM) { /* UDP IPv6 */ |
1243 |
|
|
if (skb->protocol == htons(ETH_P_IP)) { |
1244 |
|
|
ipv6_addr_set(&sin6, 0, 0, htonl(0xffff), |
1245 |
|
|
ip_hdr(skb)->saddr); |
1246 |
|
|
} else { |
1247 |
|
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
1248 |
|
|
} |
1249 |
|
|
port = udp_hdr(skb)->source; |
1250 |
|
|
} else { /* RAW IPv6 */ |
1251 |
|
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
1252 |
|
|
port = htons(sk->sk_protocol); |
1253 |
|
|
} |
1254 |
|
|
error = ccs_check_network_recvmsg_acl(true, type, |
1255 |
|
|
(u8 *) &sin6, port); |
1256 |
|
|
break; |
1257 |
|
|
case PF_INET: |
1258 |
|
|
if (type == SOCK_DGRAM) { /* UDP IPv4 */ |
1259 |
|
|
sin4.s_addr = ip_hdr(skb)->saddr; |
1260 |
|
|
port = udp_hdr(skb)->source; |
1261 |
|
|
} else { /* RAW IPv4 */ |
1262 |
|
|
sin4.s_addr = ip_hdr(skb)->saddr; |
1263 |
|
|
port = htons(sk->sk_protocol); |
1264 |
|
|
} |
1265 |
|
|
error = ccs_check_network_recvmsg_acl(false, type, |
1266 |
|
|
(u8 *) &sin4, port); |
1267 |
|
|
break; |
1268 |
|
|
} |
1269 |
|
|
if (!error) |
1270 |
|
|
return 0; |
1271 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1272 |
|
|
lock_sock(sk); |
1273 |
|
|
#endif |
1274 |
|
|
/* |
1275 |
|
|
* Remove from queue if MSG_PEEK is used so that |
1276 |
|
|
* the head message from unwanted source in receive queue will not |
1277 |
|
|
* prevent the caller from picking up next message from wanted source |
1278 |
|
|
* when the caller is using MSG_PEEK flag for picking up. |
1279 |
|
|
*/ |
1280 |
|
|
if (flags & MSG_PEEK) { |
1281 |
|
|
unsigned long cpu_flags; |
1282 |
|
|
/***** CRITICAL SECTION START *****/ |
1283 |
|
|
spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags); |
1284 |
|
|
if (skb == skb_peek(&sk->sk_receive_queue)) { |
1285 |
|
|
__skb_unlink(skb, &sk->sk_receive_queue); |
1286 |
|
|
atomic_dec(&skb->users); |
1287 |
|
|
} |
1288 |
|
|
spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags); |
1289 |
|
|
/***** CRITICAL SECTION END *****/ |
1290 |
|
|
} |
1291 |
|
|
/* Drop reference count. */ |
1292 |
|
|
skb_free_datagram(sk, skb); |
1293 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1294 |
|
|
release_sock(sk); |
1295 |
|
|
#endif |
1296 |
|
|
/* Hope less harmful than -EPERM. */ |
1297 |
|
|
return -EAGAIN; |
1298 |
|
|
} |