1 |
kumaneko |
111 |
/* |
2 |
kumaneko |
2864 |
* security/ccsecurity/network.c |
3 |
kumaneko |
111 |
* |
4 |
kumaneko |
2030 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
5 |
kumaneko |
111 |
* |
6 |
kumaneko |
2869 |
* Version: 1.7.0-pre 2009/08/08 |
7 |
kumaneko |
111 |
* |
8 |
|
|
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
9 |
|
|
* See README.ccs for ChangeLog. |
10 |
|
|
* |
11 |
|
|
*/ |
12 |
|
|
|
13 |
kumaneko |
1084 |
#include <linux/net.h> |
14 |
|
|
#include <linux/inet.h> |
15 |
|
|
#include <linux/in.h> |
16 |
|
|
#include <linux/in6.h> |
17 |
kumaneko |
2037 |
#include <net/ip.h> |
18 |
|
|
#include <net/ipv6.h> |
19 |
|
|
#include <net/udp.h> |
20 |
kumaneko |
2854 |
#include "internal.h" |
21 |
kumaneko |
111 |
|
22 |
kumaneko |
1052 |
/** |
23 |
kumaneko |
2002 |
* ccs_audit_network_log - Audit network log. |
24 |
kumaneko |
1052 |
* |
25 |
kumaneko |
1657 |
* @r: Pointer to "struct ccs_request_info". |
26 |
kumaneko |
1052 |
* @operation: The name of operation. |
27 |
|
|
* @address: An IPv4 or IPv6 address. |
28 |
|
|
* @port: Port number. |
29 |
|
|
* @is_granted: True if this is a granted log. |
30 |
|
|
* |
31 |
|
|
* Returns 0 on success, negative value otherwise. |
32 |
|
|
*/ |
33 |
kumaneko |
2002 |
static int ccs_audit_network_log(struct ccs_request_info *r, |
34 |
|
|
const char *operation, const char *address, |
35 |
|
|
const u16 port, const bool is_granted) |
36 |
kumaneko |
111 |
{ |
37 |
kumaneko |
2780 |
if (!is_granted && ccs_verbose_mode(r->domain)) |
38 |
kumaneko |
2918 |
printk(KERN_WARNING "%s: %s to %s %u denied for %s\n", |
39 |
kumaneko |
2780 |
ccs_get_msg(r->mode == 3), operation, address, port, |
40 |
|
|
ccs_get_last_name(r->domain)); |
41 |
kumaneko |
2892 |
return ccs_write_audit_log(is_granted, r, CCS_KEYWORD_ALLOW_NETWORK |
42 |
kumaneko |
1657 |
"%s %s %u\n", operation, address, port); |
43 |
kumaneko |
111 |
} |
44 |
|
|
|
45 |
kumaneko |
1052 |
/** |
46 |
kumaneko |
2890 |
* ccs_parse_ip_address - Parse an IP address. |
47 |
|
|
* |
48 |
|
|
* @address: String to parse. |
49 |
|
|
* @min: Pointer to store min address. |
50 |
|
|
* @max: Pointer to store max address. |
51 |
|
|
* |
52 |
|
|
* Returns 2 if @address is an IPv6, 1 if @address is an IPv4, 0 otherwise. |
53 |
|
|
*/ |
54 |
kumaneko |
2900 |
int ccs_parse_ip_address(char *address, u16 *min, u16 *max) |
55 |
kumaneko |
2890 |
{ |
56 |
|
|
int count = sscanf(address, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx" |
57 |
|
|
"-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
58 |
|
|
&min[0], &min[1], &min[2], &min[3], |
59 |
|
|
&min[4], &min[5], &min[6], &min[7], |
60 |
|
|
&max[0], &max[1], &max[2], &max[3], |
61 |
|
|
&max[4], &max[5], &max[6], &max[7]); |
62 |
|
|
if (count == 8 || count == 16) { |
63 |
|
|
u8 i; |
64 |
|
|
if (count == 8) |
65 |
|
|
memmove(max, min, sizeof(u16) * 8); |
66 |
|
|
for (i = 0; i < 8; i++) { |
67 |
|
|
min[i] = htons(min[i]); |
68 |
|
|
max[i] = htons(max[i]); |
69 |
|
|
} |
70 |
|
|
return 2; |
71 |
|
|
} |
72 |
|
|
count = sscanf(address, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
73 |
|
|
&min[0], &min[1], &min[2], &min[3], |
74 |
|
|
&max[0], &max[1], &max[2], &max[3]); |
75 |
|
|
if (count == 4 || count == 8) { |
76 |
|
|
u32 ip = htonl((((u8) min[0]) << 24) + (((u8) min[1]) << 16) |
77 |
|
|
+ (((u8) min[2]) << 8) + (u8) min[3]); |
78 |
|
|
memmove(min, &ip, sizeof(ip)); |
79 |
|
|
if (count == 8) |
80 |
|
|
ip = htonl((((u8) max[0]) << 24) + (((u8) max[1]) << 16) |
81 |
|
|
+ (((u8) max[2]) << 8) + (u8) max[3]); |
82 |
|
|
memmove(max, &ip, sizeof(ip)); |
83 |
|
|
return 1; |
84 |
|
|
} |
85 |
|
|
return 0; |
86 |
|
|
} |
87 |
|
|
|
88 |
kumaneko |
719 |
#if !defined(NIP6) |
89 |
kumaneko |
1052 |
#define NIP6(addr) \ |
90 |
kumaneko |
1056 |
ntohs((addr).s6_addr16[0]), ntohs((addr).s6_addr16[1]), \ |
91 |
|
|
ntohs((addr).s6_addr16[2]), ntohs((addr).s6_addr16[3]), \ |
92 |
|
|
ntohs((addr).s6_addr16[4]), ntohs((addr).s6_addr16[5]), \ |
93 |
|
|
ntohs((addr).s6_addr16[6]), ntohs((addr).s6_addr16[7]) |
94 |
kumaneko |
719 |
#endif |
95 |
|
|
|
96 |
kumaneko |
1052 |
/** |
97 |
kumaneko |
1054 |
* ccs_print_ipv6 - Print an IPv6 address. |
98 |
kumaneko |
1052 |
* |
99 |
|
|
* @buffer: Buffer to write to. |
100 |
kumaneko |
1064 |
* @buffer_len: Size of @buffer. |
101 |
kumaneko |
1052 |
* @ip: Pointer to "struct in6_addr". |
102 |
|
|
* |
103 |
kumaneko |
1064 |
* Returns nothing. |
104 |
kumaneko |
1052 |
*/ |
105 |
kumaneko |
1064 |
void ccs_print_ipv6(char *buffer, const int buffer_len, |
106 |
|
|
const struct in6_addr *ip) |
107 |
kumaneko |
111 |
{ |
108 |
|
|
memset(buffer, 0, buffer_len); |
109 |
kumaneko |
719 |
snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip)); |
110 |
kumaneko |
111 |
} |
111 |
|
|
|
112 |
kumaneko |
1052 |
/** |
113 |
|
|
* ccs_net2keyword - Convert network operation index to network operation name. |
114 |
|
|
* |
115 |
|
|
* @operation: Type of operation. |
116 |
|
|
* |
117 |
|
|
* Returns the name of operation. |
118 |
|
|
*/ |
119 |
|
|
const char *ccs_net2keyword(const u8 operation) |
120 |
kumaneko |
111 |
{ |
121 |
|
|
const char *keyword = "unknown"; |
122 |
|
|
switch (operation) { |
123 |
kumaneko |
2915 |
case CCS_NETWORK_UDP_BIND: |
124 |
kumaneko |
111 |
keyword = "UDP bind"; |
125 |
|
|
break; |
126 |
kumaneko |
2915 |
case CCS_NETWORK_UDP_CONNECT: |
127 |
kumaneko |
111 |
keyword = "UDP connect"; |
128 |
|
|
break; |
129 |
kumaneko |
2915 |
case CCS_NETWORK_TCP_BIND: |
130 |
kumaneko |
111 |
keyword = "TCP bind"; |
131 |
|
|
break; |
132 |
kumaneko |
2915 |
case CCS_NETWORK_TCP_LISTEN: |
133 |
kumaneko |
111 |
keyword = "TCP listen"; |
134 |
|
|
break; |
135 |
kumaneko |
2915 |
case CCS_NETWORK_TCP_CONNECT: |
136 |
kumaneko |
111 |
keyword = "TCP connect"; |
137 |
|
|
break; |
138 |
kumaneko |
2915 |
case CCS_NETWORK_TCP_ACCEPT: |
139 |
kumaneko |
111 |
keyword = "TCP accept"; |
140 |
|
|
break; |
141 |
kumaneko |
2915 |
case CCS_NETWORK_RAW_BIND: |
142 |
kumaneko |
111 |
keyword = "RAW bind"; |
143 |
|
|
break; |
144 |
kumaneko |
2915 |
case CCS_NETWORK_RAW_CONNECT: |
145 |
kumaneko |
111 |
keyword = "RAW connect"; |
146 |
|
|
break; |
147 |
|
|
} |
148 |
|
|
return keyword; |
149 |
|
|
} |
150 |
|
|
|
151 |
kumaneko |
1052 |
/** |
152 |
kumaneko |
2922 |
* ccs_network_entry2 - Check permission for network operation. |
153 |
kumaneko |
1052 |
* |
154 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
155 |
|
|
* @operation: Type of operation. |
156 |
|
|
* @address: An IPv4 or IPv6 address. |
157 |
|
|
* @port: Port number. |
158 |
|
|
* |
159 |
|
|
* Returns 0 on success, negative value otherwise. |
160 |
kumaneko |
2690 |
* |
161 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
162 |
kumaneko |
1052 |
*/ |
163 |
kumaneko |
2922 |
static int ccs_network_entry2(const bool is_ipv6, const u8 operation, |
164 |
kumaneko |
2702 |
const u32 *address, const u16 port) |
165 |
kumaneko |
111 |
{ |
166 |
kumaneko |
1657 |
struct ccs_request_info r; |
167 |
kumaneko |
2002 |
struct ccs_acl_info *ptr; |
168 |
kumaneko |
1052 |
const char *keyword = ccs_net2keyword(operation); |
169 |
kumaneko |
1657 |
bool is_enforce; |
170 |
kumaneko |
2916 |
const u16 perm = 1 << operation; |
171 |
kumaneko |
1052 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
172 |
|
|
const u32 ip = ntohl(*address); |
173 |
kumaneko |
2897 |
int error; |
174 |
kumaneko |
1064 |
char buf[64]; |
175 |
kumaneko |
2922 |
ccs_assert_read_lock(); |
176 |
kumaneko |
2911 |
if (!ccs_can_sleep() || |
177 |
kumaneko |
2915 |
!ccs_init_request_info(&r, NULL, CCS_MAC_NETWORK)) |
178 |
kumaneko |
1052 |
return 0; |
179 |
kumaneko |
1657 |
is_enforce = (r.mode == 3); |
180 |
kumaneko |
2002 |
retry: |
181 |
kumaneko |
2897 |
error = -EPERM; |
182 |
kumaneko |
2690 |
list_for_each_entry_rcu(ptr, &r.domain->acl_info_list, list) { |
183 |
kumaneko |
2915 |
struct ccs_ip_network_acl *acl; |
184 |
kumaneko |
2900 |
if (ptr->is_deleted || ptr->type != CCS_TYPE_IP_NETWORK_ACL) |
185 |
kumaneko |
1052 |
continue; |
186 |
kumaneko |
2915 |
acl = container_of(ptr, struct ccs_ip_network_acl, head); |
187 |
kumaneko |
2916 |
if (!(acl->perm & perm)) |
188 |
kumaneko |
1052 |
continue; |
189 |
kumaneko |
2888 |
if (!ccs_compare_number_union(port, &acl->port) || |
190 |
kumaneko |
2922 |
!ccs_condition(&r, ptr)) |
191 |
kumaneko |
2863 |
continue; |
192 |
kumaneko |
2916 |
if (acl->address_type == CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP) { |
193 |
kumaneko |
2039 |
if (!ccs_address_matches_group(is_ipv6, address, |
194 |
kumaneko |
2863 |
acl->address.group)) |
195 |
kumaneko |
1052 |
continue; |
196 |
kumaneko |
2916 |
} else if (acl->address_type == CCS_IP_ADDRESS_TYPE_IPv4) { |
197 |
kumaneko |
1052 |
if (is_ipv6 || |
198 |
kumaneko |
2863 |
ip < acl->address.ipv4.min || |
199 |
|
|
acl->address.ipv4.max < ip) |
200 |
kumaneko |
1052 |
continue; |
201 |
kumaneko |
111 |
} else { |
202 |
kumaneko |
1052 |
if (!is_ipv6 || |
203 |
kumaneko |
2863 |
memcmp(acl->address.ipv6.min, address, 16) > 0 || |
204 |
|
|
memcmp(address, acl->address.ipv6.max, 16) > 0) |
205 |
kumaneko |
1052 |
continue; |
206 |
kumaneko |
111 |
} |
207 |
kumaneko |
2690 |
r.cond = ptr->cond; |
208 |
kumaneko |
2897 |
error = 0; |
209 |
kumaneko |
708 |
break; |
210 |
kumaneko |
111 |
} |
211 |
kumaneko |
1064 |
memset(buf, 0, sizeof(buf)); |
212 |
|
|
if (is_ipv6) |
213 |
|
|
ccs_print_ipv6(buf, sizeof(buf), |
214 |
|
|
(const struct in6_addr *) address); |
215 |
|
|
else |
216 |
|
|
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
217 |
kumaneko |
2897 |
ccs_audit_network_log(&r, keyword, buf, port, !error); |
218 |
|
|
if (error) |
219 |
kumaneko |
2922 |
error = ccs_supervisor(&r, CCS_KEYWORD_ALLOW_NETWORK |
220 |
kumaneko |
2897 |
"%s %s %u\n", keyword, buf, port); |
221 |
|
|
if (error == 1) |
222 |
|
|
goto retry; |
223 |
|
|
if (!is_enforce) |
224 |
|
|
error = 0; |
225 |
|
|
return error; |
226 |
kumaneko |
111 |
} |
227 |
|
|
|
228 |
kumaneko |
1052 |
/** |
229 |
kumaneko |
2922 |
* ccs_network_entry - Check permission for network operation. |
230 |
kumaneko |
2702 |
* |
231 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
232 |
|
|
* @operation: Type of operation. |
233 |
|
|
* @address: An IPv4 or IPv6 address. |
234 |
|
|
* @port: Port number. |
235 |
|
|
* |
236 |
|
|
* Returns 0 on success, negative value otherwise. |
237 |
|
|
*/ |
238 |
kumaneko |
2922 |
static int ccs_network_entry(const bool is_ipv6, const u8 operation, |
239 |
kumaneko |
2702 |
const u32 *address, const u16 port) |
240 |
|
|
{ |
241 |
kumaneko |
2828 |
const int idx = ccs_read_lock(); |
242 |
kumaneko |
2922 |
const int error = ccs_network_entry2(is_ipv6, operation, |
243 |
kumaneko |
2702 |
address, port); |
244 |
kumaneko |
2828 |
ccs_read_unlock(idx); |
245 |
kumaneko |
2702 |
return error; |
246 |
|
|
} |
247 |
|
|
|
248 |
|
|
/** |
249 |
kumaneko |
2915 |
* ccs_write_network_policy - Write "struct ccs_ip_network_acl" list. |
250 |
kumaneko |
1052 |
* |
251 |
|
|
* @data: String to parse. |
252 |
kumaneko |
2282 |
* @domain: Pointer to "struct ccs_domain_info". |
253 |
kumaneko |
2576 |
* @condition: Pointer to "struct ccs_condition". May be NULL. |
254 |
kumaneko |
1052 |
* @is_delete: True if it is a delete request. |
255 |
|
|
* |
256 |
|
|
* Returns 0 on success, negative value otherwise. |
257 |
|
|
*/ |
258 |
kumaneko |
2282 |
int ccs_write_network_policy(char *data, struct ccs_domain_info *domain, |
259 |
kumaneko |
2576 |
struct ccs_condition *condition, |
260 |
kumaneko |
1052 |
const bool is_delete) |
261 |
kumaneko |
111 |
{ |
262 |
kumaneko |
2915 |
struct ccs_ip_network_acl *entry = NULL; |
263 |
kumaneko |
2900 |
struct ccs_acl_info *ptr; |
264 |
kumaneko |
2915 |
struct ccs_ip_network_acl e = { |
265 |
kumaneko |
2900 |
.head.type = CCS_TYPE_IP_NETWORK_ACL, |
266 |
|
|
.head.cond = condition, |
267 |
|
|
}; |
268 |
|
|
u16 min_address[8]; |
269 |
|
|
u16 max_address[8]; |
270 |
|
|
int error = is_delete ? -ENOENT : -ENOMEM; |
271 |
|
|
u8 sock_type; |
272 |
kumaneko |
2779 |
char *w[4]; |
273 |
|
|
if (!ccs_tokenize(data, w, sizeof(w)) || !w[3][0]) |
274 |
kumaneko |
2870 |
return -EINVAL; |
275 |
kumaneko |
2900 |
if (!strcmp(w[0], "TCP")) |
276 |
|
|
sock_type = SOCK_STREAM; |
277 |
|
|
else if (!strcmp(w[0], "UDP")) |
278 |
|
|
sock_type = SOCK_DGRAM; |
279 |
|
|
else if (!strcmp(w[0], "RAW")) |
280 |
|
|
sock_type = SOCK_RAW; |
281 |
|
|
else |
282 |
|
|
return -EINVAL; |
283 |
|
|
if (!strcmp(w[1], "bind")) |
284 |
|
|
switch (sock_type) { |
285 |
|
|
case SOCK_STREAM: |
286 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_TCP_BIND; |
287 |
kumaneko |
2900 |
break; |
288 |
|
|
case SOCK_DGRAM: |
289 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_UDP_BIND; |
290 |
kumaneko |
2900 |
break; |
291 |
|
|
default: |
292 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_RAW_BIND; |
293 |
kumaneko |
2900 |
break; |
294 |
|
|
} |
295 |
|
|
else if (!strcmp(w[1], "connect")) |
296 |
|
|
switch (sock_type) { |
297 |
|
|
case SOCK_STREAM: |
298 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_TCP_CONNECT; |
299 |
kumaneko |
2900 |
break; |
300 |
|
|
case SOCK_DGRAM: |
301 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_UDP_CONNECT; |
302 |
kumaneko |
2900 |
break; |
303 |
|
|
default: |
304 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_RAW_CONNECT; |
305 |
kumaneko |
2900 |
break; |
306 |
|
|
} |
307 |
|
|
else if (sock_type == SOCK_STREAM && !strcmp(w[1], "listen")) |
308 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_TCP_LISTEN; |
309 |
kumaneko |
2900 |
else if (sock_type == SOCK_STREAM && !strcmp(w[1], "accept")) |
310 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_TCP_ACCEPT; |
311 |
kumaneko |
2900 |
else |
312 |
|
|
return -EINVAL; |
313 |
|
|
switch (ccs_parse_ip_address(w[2], min_address, max_address)) { |
314 |
|
|
case 2: |
315 |
kumaneko |
2916 |
e.address_type = CCS_IP_ADDRESS_TYPE_IPv6; |
316 |
kumaneko |
2900 |
e.address.ipv6.min = ccs_get_ipv6_address((struct in6_addr *) |
317 |
|
|
min_address); |
318 |
|
|
e.address.ipv6.max = ccs_get_ipv6_address((struct in6_addr *) |
319 |
|
|
max_address); |
320 |
|
|
if (!e.address.ipv6.min || !e.address.ipv6.max) |
321 |
|
|
goto out; |
322 |
|
|
break; |
323 |
|
|
case 1: |
324 |
kumaneko |
2916 |
e.address_type = CCS_IP_ADDRESS_TYPE_IPv4; |
325 |
kumaneko |
2900 |
/* use host byte order to allow u32 comparison.*/ |
326 |
|
|
e.address.ipv4.min = ntohl(* (u32 *) min_address); |
327 |
|
|
e.address.ipv4.max = ntohl(* (u32 *) max_address); |
328 |
|
|
break; |
329 |
|
|
default: |
330 |
|
|
if (w[2][0] != '@') |
331 |
|
|
return -EINVAL; |
332 |
kumaneko |
2916 |
e.address_type = CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP; |
333 |
kumaneko |
2900 |
e.address.group = ccs_get_address_group(w[2] + 1); |
334 |
|
|
if (!e.address.group) |
335 |
|
|
return -ENOMEM; |
336 |
|
|
break; |
337 |
|
|
} |
338 |
|
|
if (!ccs_parse_number_union(w[3], &e.port)) |
339 |
|
|
goto out; |
340 |
|
|
if (!is_delete) |
341 |
|
|
entry = kmalloc(sizeof(e), GFP_KERNEL); |
342 |
|
|
mutex_lock(&ccs_policy_lock); |
343 |
|
|
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
344 |
kumaneko |
2915 |
struct ccs_ip_network_acl *acl = |
345 |
|
|
container_of(ptr, struct ccs_ip_network_acl, |
346 |
kumaneko |
2900 |
head); |
347 |
|
|
if (ptr->type != CCS_TYPE_IP_NETWORK_ACL || |
348 |
|
|
ptr->cond != condition || |
349 |
kumaneko |
2916 |
ccs_memcmp(acl, &e, offsetof(typeof(e), address_type), |
350 |
kumaneko |
2900 |
sizeof(e))) |
351 |
|
|
continue; |
352 |
kumaneko |
2916 |
if (is_delete) { |
353 |
|
|
acl->perm &= ~e.perm; |
354 |
|
|
if (!acl->perm) |
355 |
|
|
ptr->is_deleted = true; |
356 |
|
|
} else { |
357 |
|
|
if (ptr->is_deleted) |
358 |
|
|
acl->perm = 0; |
359 |
|
|
acl->perm |= e.perm; |
360 |
|
|
ptr->is_deleted = false; |
361 |
|
|
} |
362 |
kumaneko |
2900 |
error = 0; |
363 |
|
|
break; |
364 |
|
|
} |
365 |
|
|
if (!is_delete && error && ccs_commit_ok(entry, &e, sizeof(e))) { |
366 |
|
|
ccs_add_domain_acl(domain, &entry->head); |
367 |
|
|
entry = NULL; |
368 |
|
|
error = 0; |
369 |
|
|
} |
370 |
|
|
mutex_unlock(&ccs_policy_lock); |
371 |
|
|
out: |
372 |
|
|
if (w[2][0] == '@') |
373 |
|
|
ccs_put_address_group(e.address.group); |
374 |
kumaneko |
2916 |
else if (e.address_type == CCS_IP_ADDRESS_TYPE_IPv6) { |
375 |
kumaneko |
2900 |
ccs_put_ipv6_address(e.address.ipv6.min); |
376 |
|
|
ccs_put_ipv6_address(e.address.ipv6.max); |
377 |
|
|
} |
378 |
|
|
ccs_put_number_union(&e.port); |
379 |
|
|
kfree(entry); |
380 |
|
|
return error; |
381 |
kumaneko |
111 |
} |
382 |
|
|
|
383 |
kumaneko |
1052 |
/** |
384 |
kumaneko |
2922 |
* ccs_network_listen_acl - Check permission for listen() operation. |
385 |
kumaneko |
1052 |
* |
386 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
387 |
|
|
* @address: An IPv4 or IPv6 address. |
388 |
|
|
* @port: Port number. |
389 |
|
|
* |
390 |
|
|
* Returns 0 on success, negative value otherwise. |
391 |
|
|
*/ |
392 |
kumaneko |
2922 |
static inline int ccs_network_listen_acl(const bool is_ipv6, |
393 |
kumaneko |
2037 |
const u8 *address, |
394 |
|
|
const u16 port) |
395 |
kumaneko |
111 |
{ |
396 |
kumaneko |
2922 |
return ccs_network_entry(is_ipv6, CCS_NETWORK_TCP_LISTEN, |
397 |
kumaneko |
2002 |
(const u32 *) address, ntohs(port)); |
398 |
kumaneko |
111 |
} |
399 |
|
|
|
400 |
kumaneko |
1052 |
/** |
401 |
kumaneko |
2922 |
* ccs_network_connect_acl - Check permission for connect() operation. |
402 |
kumaneko |
1052 |
* |
403 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
404 |
|
|
* @sock_type: Type of socket. (TCP or UDP or RAW) |
405 |
|
|
* @address: An IPv4 or IPv6 address. |
406 |
|
|
* @port: Port number. |
407 |
|
|
* |
408 |
|
|
* Returns 0 on success, negative value otherwise. |
409 |
|
|
*/ |
410 |
kumaneko |
2922 |
static inline int ccs_network_connect_acl(const bool is_ipv6, |
411 |
kumaneko |
2037 |
const int sock_type, |
412 |
|
|
const u8 *address, |
413 |
|
|
const u16 port) |
414 |
kumaneko |
111 |
{ |
415 |
kumaneko |
1052 |
u8 operation; |
416 |
|
|
switch (sock_type) { |
417 |
|
|
case SOCK_STREAM: |
418 |
kumaneko |
2915 |
operation = CCS_NETWORK_TCP_CONNECT; |
419 |
kumaneko |
1052 |
break; |
420 |
|
|
case SOCK_DGRAM: |
421 |
kumaneko |
2915 |
operation = CCS_NETWORK_UDP_CONNECT; |
422 |
kumaneko |
1052 |
break; |
423 |
|
|
default: |
424 |
kumaneko |
2915 |
operation = CCS_NETWORK_RAW_CONNECT; |
425 |
kumaneko |
1052 |
} |
426 |
kumaneko |
2922 |
return ccs_network_entry(is_ipv6, operation, |
427 |
kumaneko |
2002 |
(const u32 *) address, ntohs(port)); |
428 |
kumaneko |
111 |
} |
429 |
|
|
|
430 |
kumaneko |
1052 |
/** |
431 |
kumaneko |
2922 |
* ccs_network_bind_acl - Check permission for bind() operation. |
432 |
kumaneko |
1052 |
* |
433 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
434 |
|
|
* @sock_type: Type of socket. (TCP or UDP or RAW) |
435 |
|
|
* @address: An IPv4 or IPv6 address. |
436 |
|
|
* @port: Port number. |
437 |
|
|
* |
438 |
|
|
* Returns 0 on success, negative value otherwise. |
439 |
|
|
*/ |
440 |
kumaneko |
2922 |
static int ccs_network_bind_acl(const bool is_ipv6, const int sock_type, |
441 |
kumaneko |
2037 |
const u8 *address, const u16 port) |
442 |
kumaneko |
111 |
{ |
443 |
kumaneko |
1052 |
u8 operation; |
444 |
|
|
switch (sock_type) { |
445 |
|
|
case SOCK_STREAM: |
446 |
kumaneko |
2915 |
operation = CCS_NETWORK_TCP_BIND; |
447 |
kumaneko |
1052 |
break; |
448 |
|
|
case SOCK_DGRAM: |
449 |
kumaneko |
2915 |
operation = CCS_NETWORK_UDP_BIND; |
450 |
kumaneko |
1052 |
break; |
451 |
|
|
default: |
452 |
kumaneko |
2915 |
operation = CCS_NETWORK_RAW_BIND; |
453 |
kumaneko |
1052 |
} |
454 |
kumaneko |
2922 |
return ccs_network_entry(is_ipv6, operation, |
455 |
kumaneko |
2002 |
(const u32 *) address, ntohs(port)); |
456 |
kumaneko |
111 |
} |
457 |
|
|
|
458 |
kumaneko |
1052 |
/** |
459 |
kumaneko |
2922 |
* ccs_network_accept_acl - Check permission for accept() operation. |
460 |
kumaneko |
1052 |
* |
461 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
462 |
|
|
* @address: An IPv4 or IPv6 address. |
463 |
|
|
* @port: Port number. |
464 |
|
|
* |
465 |
|
|
* Returns 0 on success, negative value otherwise. |
466 |
|
|
*/ |
467 |
kumaneko |
2922 |
static inline int ccs_network_accept_acl(const bool is_ipv6, |
468 |
kumaneko |
2037 |
const u8 *address, |
469 |
|
|
const u16 port) |
470 |
kumaneko |
111 |
{ |
471 |
kumaneko |
708 |
int retval; |
472 |
kumaneko |
2282 |
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
473 |
kumaneko |
2922 |
retval = ccs_network_entry(is_ipv6, CCS_NETWORK_TCP_ACCEPT, |
474 |
kumaneko |
2002 |
(const u32 *) address, ntohs(port)); |
475 |
kumaneko |
2282 |
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
476 |
kumaneko |
708 |
return retval; |
477 |
kumaneko |
111 |
} |
478 |
|
|
|
479 |
kumaneko |
1052 |
/** |
480 |
kumaneko |
2922 |
* ccs_network_sendmsg_acl - Check permission for sendmsg() operation. |
481 |
kumaneko |
1052 |
* |
482 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
483 |
|
|
* @sock_type: Type of socket. (UDP or RAW) |
484 |
|
|
* @address: An IPv4 or IPv6 address. |
485 |
|
|
* @port: Port number. |
486 |
|
|
* |
487 |
|
|
* Returns 0 on success, negative value otherwise. |
488 |
|
|
*/ |
489 |
kumaneko |
2922 |
static inline int ccs_network_sendmsg_acl(const bool is_ipv6, |
490 |
kumaneko |
2037 |
const int sock_type, |
491 |
|
|
const u8 *address, |
492 |
|
|
const u16 port) |
493 |
kumaneko |
111 |
{ |
494 |
kumaneko |
1052 |
u8 operation; |
495 |
|
|
if (sock_type == SOCK_DGRAM) |
496 |
kumaneko |
2915 |
operation = CCS_NETWORK_UDP_CONNECT; |
497 |
kumaneko |
1052 |
else |
498 |
kumaneko |
2915 |
operation = CCS_NETWORK_RAW_CONNECT; |
499 |
kumaneko |
2922 |
return ccs_network_entry(is_ipv6, operation, |
500 |
kumaneko |
2002 |
(const u32 *) address, ntohs(port)); |
501 |
kumaneko |
111 |
} |
502 |
|
|
|
503 |
kumaneko |
1052 |
/** |
504 |
kumaneko |
2922 |
* ccs_network_recvmsg_acl - Check permission for recvmsg() operation. |
505 |
kumaneko |
1052 |
* |
506 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
507 |
|
|
* @sock_type: Type of socket. (UDP or RAW) |
508 |
|
|
* @address: An IPv4 or IPv6 address. |
509 |
|
|
* @port: Port number. |
510 |
|
|
* |
511 |
|
|
* Returns 0 on success, negative value otherwise. |
512 |
|
|
*/ |
513 |
kumaneko |
2922 |
static inline int ccs_network_recvmsg_acl(const bool is_ipv6, |
514 |
kumaneko |
2037 |
const int sock_type, |
515 |
|
|
const u8 *address, |
516 |
|
|
const u16 port) |
517 |
kumaneko |
111 |
{ |
518 |
kumaneko |
708 |
int retval; |
519 |
kumaneko |
1052 |
const u8 operation |
520 |
kumaneko |
1064 |
= (sock_type == SOCK_DGRAM) ? |
521 |
kumaneko |
2915 |
CCS_NETWORK_UDP_CONNECT : CCS_NETWORK_RAW_CONNECT; |
522 |
kumaneko |
2282 |
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
523 |
kumaneko |
2922 |
retval = ccs_network_entry(is_ipv6, operation, |
524 |
kumaneko |
2002 |
(const u32 *) address, ntohs(port)); |
525 |
kumaneko |
2282 |
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
526 |
kumaneko |
708 |
return retval; |
527 |
kumaneko |
111 |
} |
528 |
kumaneko |
2037 |
|
529 |
|
|
#define MAX_SOCK_ADDR 128 /* net/socket.c */ |
530 |
|
|
|
531 |
|
|
/* Check permission for creating a socket. */ |
532 |
|
|
int ccs_socket_create_permission(int family, int type, int protocol) |
533 |
|
|
{ |
534 |
|
|
int error = 0; |
535 |
|
|
/* Nothing to do if I am a kernel service. */ |
536 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
537 |
|
|
return 0; |
538 |
kumaneko |
2282 |
if (family == PF_PACKET && !ccs_capable(CCS_USE_PACKET_SOCKET)) |
539 |
kumaneko |
2037 |
return -EPERM; |
540 |
kumaneko |
2282 |
if (family == PF_ROUTE && !ccs_capable(CCS_USE_ROUTE_SOCKET)) |
541 |
kumaneko |
2037 |
return -EPERM; |
542 |
|
|
if (family != PF_INET && family != PF_INET6) |
543 |
|
|
return 0; |
544 |
|
|
switch (type) { |
545 |
|
|
case SOCK_STREAM: |
546 |
kumaneko |
2282 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CREATE)) |
547 |
kumaneko |
2037 |
error = -EPERM; |
548 |
|
|
break; |
549 |
|
|
case SOCK_DGRAM: |
550 |
kumaneko |
2282 |
if (!ccs_capable(CCS_USE_INET_DGRAM_SOCKET)) |
551 |
kumaneko |
2037 |
error = -EPERM; |
552 |
|
|
break; |
553 |
|
|
case SOCK_RAW: |
554 |
kumaneko |
2282 |
if (!ccs_capable(CCS_USE_INET_RAW_SOCKET)) |
555 |
kumaneko |
2037 |
error = -EPERM; |
556 |
|
|
break; |
557 |
|
|
} |
558 |
|
|
return error; |
559 |
|
|
} |
560 |
|
|
|
561 |
|
|
/* Check permission for listening a TCP socket. */ |
562 |
|
|
int ccs_socket_listen_permission(struct socket *sock) |
563 |
|
|
{ |
564 |
|
|
int error = 0; |
565 |
|
|
char addr[MAX_SOCK_ADDR]; |
566 |
|
|
int addr_len; |
567 |
|
|
/* Nothing to do if I am a kernel service. */ |
568 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
569 |
|
|
return 0; |
570 |
|
|
if (sock->type != SOCK_STREAM) |
571 |
|
|
return 0; |
572 |
|
|
switch (sock->sk->sk_family) { |
573 |
|
|
case PF_INET: |
574 |
|
|
case PF_INET6: |
575 |
|
|
break; |
576 |
|
|
default: |
577 |
|
|
return 0; |
578 |
|
|
} |
579 |
kumaneko |
2282 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_LISTEN)) |
580 |
kumaneko |
2037 |
return -EPERM; |
581 |
|
|
if (sock->ops->getname(sock, (struct sockaddr *) addr, &addr_len, 0)) |
582 |
|
|
return -EPERM; |
583 |
|
|
switch (((struct sockaddr *) addr)->sa_family) { |
584 |
|
|
struct sockaddr_in6 *addr6; |
585 |
|
|
struct sockaddr_in *addr4; |
586 |
|
|
case AF_INET6: |
587 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
588 |
kumaneko |
2922 |
error = ccs_network_listen_acl(true, |
589 |
kumaneko |
2037 |
addr6->sin6_addr.s6_addr, |
590 |
|
|
addr6->sin6_port); |
591 |
|
|
break; |
592 |
|
|
case AF_INET: |
593 |
|
|
addr4 = (struct sockaddr_in *) addr; |
594 |
kumaneko |
2922 |
error = ccs_network_listen_acl(false, |
595 |
kumaneko |
2037 |
(u8 *) &addr4->sin_addr, |
596 |
|
|
addr4->sin_port); |
597 |
|
|
break; |
598 |
|
|
} |
599 |
|
|
return error; |
600 |
|
|
} |
601 |
|
|
|
602 |
|
|
/* Check permission for setting the remote IP address/port pair of a socket. */ |
603 |
|
|
int ccs_socket_connect_permission(struct socket *sock, struct sockaddr *addr, |
604 |
|
|
int addr_len) |
605 |
|
|
{ |
606 |
|
|
int error = 0; |
607 |
|
|
const unsigned int type = sock->type; |
608 |
|
|
/* Nothing to do if I am a kernel service. */ |
609 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
610 |
|
|
return 0; |
611 |
|
|
switch (type) { |
612 |
|
|
case SOCK_STREAM: |
613 |
|
|
case SOCK_DGRAM: |
614 |
|
|
case SOCK_RAW: |
615 |
|
|
break; |
616 |
|
|
default: |
617 |
|
|
return 0; |
618 |
|
|
} |
619 |
|
|
switch (addr->sa_family) { |
620 |
|
|
struct sockaddr_in6 *addr6; |
621 |
|
|
struct sockaddr_in *addr4; |
622 |
|
|
u16 port; |
623 |
|
|
case AF_INET6: |
624 |
|
|
if (addr_len < SIN6_LEN_RFC2133) |
625 |
|
|
break; |
626 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
627 |
|
|
if (type != SOCK_RAW) |
628 |
|
|
port = addr6->sin6_port; |
629 |
|
|
else |
630 |
|
|
port = htons(sock->sk->sk_protocol); |
631 |
kumaneko |
2922 |
error = ccs_network_connect_acl(true, type, |
632 |
kumaneko |
2037 |
addr6->sin6_addr.s6_addr, |
633 |
|
|
port); |
634 |
|
|
break; |
635 |
|
|
case AF_INET: |
636 |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
637 |
|
|
break; |
638 |
|
|
addr4 = (struct sockaddr_in *) addr; |
639 |
|
|
if (type != SOCK_RAW) |
640 |
|
|
port = addr4->sin_port; |
641 |
|
|
else |
642 |
|
|
port = htons(sock->sk->sk_protocol); |
643 |
kumaneko |
2922 |
error = ccs_network_connect_acl(false, type, |
644 |
kumaneko |
2037 |
(u8 *) &addr4->sin_addr, |
645 |
|
|
port); |
646 |
|
|
break; |
647 |
|
|
} |
648 |
|
|
if (type != SOCK_STREAM) |
649 |
|
|
return error; |
650 |
|
|
switch (sock->sk->sk_family) { |
651 |
|
|
case PF_INET: |
652 |
|
|
case PF_INET6: |
653 |
kumaneko |
2282 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CONNECT)) |
654 |
kumaneko |
2037 |
error = -EPERM; |
655 |
|
|
break; |
656 |
|
|
} |
657 |
|
|
return error; |
658 |
|
|
} |
659 |
|
|
|
660 |
|
|
/* Check permission for setting the local IP address/port pair of a socket. */ |
661 |
|
|
int ccs_socket_bind_permission(struct socket *sock, struct sockaddr *addr, |
662 |
|
|
int addr_len) |
663 |
|
|
{ |
664 |
|
|
int error = 0; |
665 |
|
|
const unsigned int type = sock->type; |
666 |
|
|
/* Nothing to do if I am a kernel service. */ |
667 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
668 |
|
|
return 0; |
669 |
|
|
switch (type) { |
670 |
|
|
case SOCK_STREAM: |
671 |
|
|
case SOCK_DGRAM: |
672 |
|
|
case SOCK_RAW: |
673 |
|
|
break; |
674 |
|
|
default: |
675 |
|
|
return 0; |
676 |
|
|
} |
677 |
|
|
switch (addr->sa_family) { |
678 |
|
|
struct sockaddr_in6 *addr6; |
679 |
|
|
struct sockaddr_in *addr4; |
680 |
|
|
u16 port; |
681 |
|
|
case AF_INET6: |
682 |
|
|
if (addr_len < SIN6_LEN_RFC2133) |
683 |
|
|
break; |
684 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
685 |
|
|
if (type != SOCK_RAW) |
686 |
|
|
port = addr6->sin6_port; |
687 |
|
|
else |
688 |
|
|
port = htons(sock->sk->sk_protocol); |
689 |
kumaneko |
2922 |
error = ccs_network_bind_acl(true, type, |
690 |
kumaneko |
2037 |
addr6->sin6_addr.s6_addr, |
691 |
|
|
port); |
692 |
|
|
break; |
693 |
|
|
case AF_INET: |
694 |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
695 |
|
|
break; |
696 |
|
|
addr4 = (struct sockaddr_in *) addr; |
697 |
|
|
if (type != SOCK_RAW) |
698 |
|
|
port = addr4->sin_port; |
699 |
|
|
else |
700 |
|
|
port = htons(sock->sk->sk_protocol); |
701 |
kumaneko |
2922 |
error = ccs_network_bind_acl(false, type, |
702 |
kumaneko |
2037 |
(u8 *) &addr4->sin_addr, |
703 |
|
|
port); |
704 |
|
|
break; |
705 |
|
|
} |
706 |
|
|
return error; |
707 |
|
|
} |
708 |
|
|
|
709 |
|
|
/* |
710 |
|
|
* Check permission for accepting a TCP socket. |
711 |
|
|
* |
712 |
|
|
* Currently, the LSM hook for this purpose is not provided. |
713 |
|
|
*/ |
714 |
|
|
int ccs_socket_accept_permission(struct socket *sock, struct sockaddr *addr) |
715 |
|
|
{ |
716 |
|
|
int error = 0; |
717 |
|
|
int addr_len; |
718 |
|
|
/* Nothing to do if I am a kernel service. */ |
719 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
720 |
|
|
return 0; |
721 |
|
|
switch (sock->sk->sk_family) { |
722 |
|
|
case PF_INET: |
723 |
|
|
case PF_INET6: |
724 |
|
|
break; |
725 |
|
|
default: |
726 |
|
|
return 0; |
727 |
|
|
} |
728 |
|
|
error = sock->ops->getname(sock, addr, &addr_len, 2); |
729 |
|
|
if (error) |
730 |
|
|
return error; |
731 |
|
|
switch (addr->sa_family) { |
732 |
|
|
struct sockaddr_in6 *addr6; |
733 |
|
|
struct sockaddr_in *addr4; |
734 |
|
|
case AF_INET6: |
735 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
736 |
kumaneko |
2922 |
error = ccs_network_accept_acl(true, |
737 |
kumaneko |
2037 |
addr6->sin6_addr.s6_addr, |
738 |
|
|
addr6->sin6_port); |
739 |
|
|
break; |
740 |
|
|
case AF_INET: |
741 |
|
|
addr4 = (struct sockaddr_in *) addr; |
742 |
kumaneko |
2922 |
error = ccs_network_accept_acl(false, |
743 |
kumaneko |
2037 |
(u8 *) &addr4->sin_addr, |
744 |
|
|
addr4->sin_port); |
745 |
|
|
break; |
746 |
|
|
} |
747 |
|
|
return error; |
748 |
|
|
} |
749 |
|
|
|
750 |
|
|
/* Check permission for sending a datagram via a UDP or RAW socket. */ |
751 |
|
|
int ccs_socket_sendmsg_permission(struct socket *sock, struct sockaddr *addr, |
752 |
|
|
int addr_len) |
753 |
|
|
{ |
754 |
|
|
int error = 0; |
755 |
|
|
const int type = sock->type; |
756 |
|
|
/* Nothing to do if I am a kernel service. */ |
757 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
758 |
|
|
return 0; |
759 |
|
|
if (!addr || (type != SOCK_DGRAM && type != SOCK_RAW)) |
760 |
|
|
return 0; |
761 |
|
|
switch (addr->sa_family) { |
762 |
|
|
struct sockaddr_in6 *addr6; |
763 |
|
|
struct sockaddr_in *addr4; |
764 |
|
|
u16 port; |
765 |
|
|
case AF_INET6: |
766 |
|
|
if (addr_len < SIN6_LEN_RFC2133) |
767 |
|
|
break; |
768 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
769 |
|
|
if (type == SOCK_DGRAM) |
770 |
|
|
port = addr6->sin6_port; |
771 |
|
|
else |
772 |
|
|
port = htons(sock->sk->sk_protocol); |
773 |
kumaneko |
2922 |
error = ccs_network_sendmsg_acl(true, type, |
774 |
kumaneko |
2037 |
addr6->sin6_addr.s6_addr, |
775 |
|
|
port); |
776 |
|
|
break; |
777 |
|
|
case AF_INET: |
778 |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
779 |
|
|
break; |
780 |
|
|
addr4 = (struct sockaddr_in *) addr; |
781 |
|
|
if (type == SOCK_DGRAM) |
782 |
|
|
port = addr4->sin_port; |
783 |
|
|
else |
784 |
|
|
port = htons(sock->sk->sk_protocol); |
785 |
kumaneko |
2922 |
error = ccs_network_sendmsg_acl(false, type, |
786 |
kumaneko |
2037 |
(u8 *) &addr4->sin_addr, |
787 |
|
|
port); |
788 |
|
|
break; |
789 |
|
|
} |
790 |
|
|
return error; |
791 |
|
|
} |
792 |
|
|
|
793 |
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) |
794 |
|
|
#if !defined(RHEL_MAJOR) || RHEL_MAJOR != 5 |
795 |
|
|
|
796 |
|
|
static inline struct iphdr *ip_hdr(const struct sk_buff *skb) |
797 |
|
|
{ |
798 |
|
|
return skb->nh.iph; |
799 |
|
|
} |
800 |
|
|
|
801 |
|
|
static inline struct udphdr *udp_hdr(const struct sk_buff *skb) |
802 |
|
|
{ |
803 |
|
|
return skb->h.uh; |
804 |
|
|
} |
805 |
|
|
|
806 |
|
|
static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) |
807 |
|
|
{ |
808 |
|
|
return skb->nh.ipv6h; |
809 |
|
|
} |
810 |
|
|
|
811 |
|
|
#endif |
812 |
|
|
#endif |
813 |
|
|
|
814 |
kumaneko |
2459 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 12) |
815 |
|
|
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
816 |
|
|
unsigned int flags) |
817 |
|
|
{ |
818 |
|
|
/* Clear queue. */ |
819 |
|
|
if (flags & MSG_PEEK) { |
820 |
|
|
int clear = 0; |
821 |
|
|
spin_lock_irq(&sk->sk_receive_queue.lock); |
822 |
|
|
if (skb == skb_peek(&sk->sk_receive_queue)) { |
823 |
|
|
__skb_unlink(skb, &sk->sk_receive_queue); |
824 |
|
|
clear = 1; |
825 |
|
|
} |
826 |
|
|
spin_unlock_irq(&sk->sk_receive_queue.lock); |
827 |
|
|
if (clear) |
828 |
|
|
kfree_skb(skb); |
829 |
|
|
} |
830 |
kumaneko |
2570 |
skb_free_datagram(sk, skb); |
831 |
kumaneko |
2459 |
} |
832 |
|
|
#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16) |
833 |
|
|
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
834 |
|
|
unsigned int flags) |
835 |
|
|
{ |
836 |
|
|
/* Clear queue. */ |
837 |
|
|
if (flags & MSG_PEEK) { |
838 |
|
|
int clear = 0; |
839 |
|
|
spin_lock_bh(&sk->sk_receive_queue.lock); |
840 |
|
|
if (skb == skb_peek(&sk->sk_receive_queue)) { |
841 |
|
|
__skb_unlink(skb, &sk->sk_receive_queue); |
842 |
|
|
clear = 1; |
843 |
|
|
} |
844 |
|
|
spin_unlock_bh(&sk->sk_receive_queue.lock); |
845 |
|
|
if (clear) |
846 |
|
|
kfree_skb(skb); |
847 |
|
|
} |
848 |
kumaneko |
2570 |
skb_free_datagram(sk, skb); |
849 |
kumaneko |
2459 |
} |
850 |
|
|
#endif |
851 |
|
|
|
852 |
kumaneko |
2037 |
/* |
853 |
|
|
* Check permission for receiving a datagram via a UDP or RAW socket. |
854 |
|
|
* |
855 |
|
|
* Currently, the LSM hook for this purpose is not provided. |
856 |
|
|
*/ |
857 |
kumaneko |
2459 |
int ccs_socket_recvmsg_permission(struct sock *sk, struct sk_buff *skb, |
858 |
|
|
const unsigned int flags) |
859 |
kumaneko |
2037 |
{ |
860 |
|
|
int error = 0; |
861 |
|
|
const unsigned int type = sk->sk_type; |
862 |
kumaneko |
2459 |
if (type != SOCK_DGRAM && type != SOCK_RAW) |
863 |
kumaneko |
2037 |
return 0; |
864 |
|
|
/* Nothing to do if I am a kernel service. */ |
865 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
866 |
|
|
return 0; |
867 |
|
|
|
868 |
|
|
switch (sk->sk_family) { |
869 |
|
|
struct in6_addr sin6; |
870 |
|
|
struct in_addr sin4; |
871 |
|
|
u16 port; |
872 |
|
|
case PF_INET6: |
873 |
|
|
if (type == SOCK_DGRAM) { /* UDP IPv6 */ |
874 |
|
|
if (skb->protocol == htons(ETH_P_IP)) { |
875 |
|
|
ipv6_addr_set(&sin6, 0, 0, htonl(0xffff), |
876 |
|
|
ip_hdr(skb)->saddr); |
877 |
|
|
} else { |
878 |
|
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
879 |
|
|
} |
880 |
|
|
port = udp_hdr(skb)->source; |
881 |
|
|
} else { /* RAW IPv6 */ |
882 |
|
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
883 |
|
|
port = htons(sk->sk_protocol); |
884 |
|
|
} |
885 |
kumaneko |
2922 |
error = ccs_network_recvmsg_acl(true, type, |
886 |
kumaneko |
2037 |
(u8 *) &sin6, port); |
887 |
|
|
break; |
888 |
|
|
case PF_INET: |
889 |
|
|
if (type == SOCK_DGRAM) { /* UDP IPv4 */ |
890 |
|
|
sin4.s_addr = ip_hdr(skb)->saddr; |
891 |
|
|
port = udp_hdr(skb)->source; |
892 |
|
|
} else { /* RAW IPv4 */ |
893 |
|
|
sin4.s_addr = ip_hdr(skb)->saddr; |
894 |
|
|
port = htons(sk->sk_protocol); |
895 |
|
|
} |
896 |
kumaneko |
2922 |
error = ccs_network_recvmsg_acl(false, type, |
897 |
kumaneko |
2037 |
(u8 *) &sin4, port); |
898 |
|
|
break; |
899 |
|
|
} |
900 |
|
|
if (!error) |
901 |
|
|
return 0; |
902 |
|
|
/* |
903 |
|
|
* Remove from queue if MSG_PEEK is used so that |
904 |
|
|
* the head message from unwanted source in receive queue will not |
905 |
|
|
* prevent the caller from picking up next message from wanted source |
906 |
|
|
* when the caller is using MSG_PEEK flag for picking up. |
907 |
|
|
*/ |
908 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
909 |
kumaneko |
2459 |
if (type == SOCK_DGRAM) |
910 |
|
|
lock_sock(sk); |
911 |
kumaneko |
2037 |
#endif |
912 |
kumaneko |
2459 |
skb_kill_datagram(sk, skb, flags); |
913 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
914 |
|
|
if (type == SOCK_DGRAM) |
915 |
|
|
release_sock(sk); |
916 |
|
|
#endif |
917 |
kumaneko |
2037 |
/* Hope less harmful than -EPERM. */ |
918 |
kumaneko |
2519 |
return -ENOMEM; |
919 |
kumaneko |
2037 |
} |
920 |
kumaneko |
2459 |
EXPORT_SYMBOL(ccs_socket_recvmsg_permission); |