1 |
kumaneko |
111 |
/* |
2 |
kumaneko |
2864 |
* security/ccsecurity/network.c |
3 |
kumaneko |
111 |
* |
4 |
kumaneko |
3502 |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
5 |
kumaneko |
111 |
* |
6 |
kumaneko |
3561 |
* Version: 1.7.2 2010/04/01 |
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 |
|
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* |
11 |
|
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*/ |
12 |
|
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|
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 |
|
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#include <net/ipv6.h> |
19 |
|
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#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 |
|
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* @address: An IPv4 or IPv6 address. |
28 |
|
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* @port: Port number. |
29 |
|
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* @is_granted: True if this is a granted log. |
30 |
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* |
31 |
|
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* Returns 0 on success, negative value otherwise. |
32 |
|
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*/ |
33 |
kumaneko |
2002 |
static int ccs_audit_network_log(struct ccs_request_info *r, |
34 |
|
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const char *operation, const char *address, |
35 |
|
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const u16 port, const bool is_granted) |
36 |
kumaneko |
111 |
{ |
37 |
kumaneko |
2943 |
if (!is_granted) |
38 |
|
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ccs_warn_log(r, "%s %s %u", operation, address, port); |
39 |
kumaneko |
2892 |
return ccs_write_audit_log(is_granted, r, CCS_KEYWORD_ALLOW_NETWORK |
40 |
kumaneko |
1657 |
"%s %s %u\n", operation, address, port); |
41 |
kumaneko |
111 |
} |
42 |
|
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|
43 |
kumaneko |
1052 |
/** |
44 |
kumaneko |
2890 |
* ccs_parse_ip_address - Parse an IP address. |
45 |
|
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* |
46 |
|
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* @address: String to parse. |
47 |
|
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* @min: Pointer to store min address. |
48 |
|
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* @max: Pointer to store max address. |
49 |
|
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* |
50 |
|
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* Returns 2 if @address is an IPv6, 1 if @address is an IPv4, 0 otherwise. |
51 |
|
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*/ |
52 |
kumaneko |
2900 |
int ccs_parse_ip_address(char *address, u16 *min, u16 *max) |
53 |
kumaneko |
2890 |
{ |
54 |
|
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int count = sscanf(address, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx" |
55 |
|
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"-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
56 |
|
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&min[0], &min[1], &min[2], &min[3], |
57 |
|
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&min[4], &min[5], &min[6], &min[7], |
58 |
|
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&max[0], &max[1], &max[2], &max[3], |
59 |
|
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&max[4], &max[5], &max[6], &max[7]); |
60 |
|
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if (count == 8 || count == 16) { |
61 |
|
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u8 i; |
62 |
|
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if (count == 8) |
63 |
|
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memmove(max, min, sizeof(u16) * 8); |
64 |
|
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for (i = 0; i < 8; i++) { |
65 |
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min[i] = htons(min[i]); |
66 |
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max[i] = htons(max[i]); |
67 |
|
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} |
68 |
|
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return 2; |
69 |
|
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} |
70 |
|
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count = sscanf(address, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
71 |
|
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&min[0], &min[1], &min[2], &min[3], |
72 |
|
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&max[0], &max[1], &max[2], &max[3]); |
73 |
|
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if (count == 4 || count == 8) { |
74 |
|
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u32 ip = htonl((((u8) min[0]) << 24) + (((u8) min[1]) << 16) |
75 |
|
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+ (((u8) min[2]) << 8) + (u8) min[3]); |
76 |
|
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memmove(min, &ip, sizeof(ip)); |
77 |
|
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if (count == 8) |
78 |
kumaneko |
3625 |
ip = htonl((((u8) max[0]) << 24) |
79 |
|
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+ (((u8) max[1]) << 16) |
80 |
kumaneko |
2890 |
+ (((u8) max[2]) << 8) + (u8) max[3]); |
81 |
|
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memmove(max, &ip, sizeof(ip)); |
82 |
|
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return 1; |
83 |
|
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} |
84 |
|
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return 0; |
85 |
|
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} |
86 |
|
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|
87 |
kumaneko |
719 |
#if !defined(NIP6) |
88 |
kumaneko |
2943 |
#define NIP6(addr) \ |
89 |
|
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ntohs((addr).s6_addr16[0]), ntohs((addr).s6_addr16[1]), \ |
90 |
|
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ntohs((addr).s6_addr16[2]), ntohs((addr).s6_addr16[3]), \ |
91 |
|
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ntohs((addr).s6_addr16[4]), ntohs((addr).s6_addr16[5]), \ |
92 |
|
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ntohs((addr).s6_addr16[6]), ntohs((addr).s6_addr16[7]) |
93 |
kumaneko |
719 |
#endif |
94 |
|
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|
95 |
kumaneko |
1052 |
/** |
96 |
kumaneko |
1054 |
* ccs_print_ipv6 - Print an IPv6 address. |
97 |
kumaneko |
1052 |
* |
98 |
|
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* @buffer: Buffer to write to. |
99 |
kumaneko |
1064 |
* @buffer_len: Size of @buffer. |
100 |
kumaneko |
1052 |
* @ip: Pointer to "struct in6_addr". |
101 |
|
|
* |
102 |
kumaneko |
1064 |
* Returns nothing. |
103 |
kumaneko |
1052 |
*/ |
104 |
kumaneko |
1064 |
void ccs_print_ipv6(char *buffer, const int buffer_len, |
105 |
|
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const struct in6_addr *ip) |
106 |
kumaneko |
111 |
{ |
107 |
|
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memset(buffer, 0, buffer_len); |
108 |
kumaneko |
719 |
snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip)); |
109 |
kumaneko |
111 |
} |
110 |
|
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|
111 |
kumaneko |
1052 |
/** |
112 |
|
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* ccs_net2keyword - Convert network operation index to network operation name. |
113 |
|
|
* |
114 |
|
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* @operation: Type of operation. |
115 |
|
|
* |
116 |
|
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* Returns the name of operation. |
117 |
|
|
*/ |
118 |
|
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const char *ccs_net2keyword(const u8 operation) |
119 |
kumaneko |
111 |
{ |
120 |
|
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const char *keyword = "unknown"; |
121 |
|
|
switch (operation) { |
122 |
kumaneko |
2915 |
case CCS_NETWORK_UDP_BIND: |
123 |
kumaneko |
111 |
keyword = "UDP bind"; |
124 |
|
|
break; |
125 |
kumaneko |
2915 |
case CCS_NETWORK_UDP_CONNECT: |
126 |
kumaneko |
111 |
keyword = "UDP connect"; |
127 |
|
|
break; |
128 |
kumaneko |
2915 |
case CCS_NETWORK_TCP_BIND: |
129 |
kumaneko |
111 |
keyword = "TCP bind"; |
130 |
|
|
break; |
131 |
kumaneko |
2915 |
case CCS_NETWORK_TCP_LISTEN: |
132 |
kumaneko |
111 |
keyword = "TCP listen"; |
133 |
|
|
break; |
134 |
kumaneko |
2915 |
case CCS_NETWORK_TCP_CONNECT: |
135 |
kumaneko |
111 |
keyword = "TCP connect"; |
136 |
|
|
break; |
137 |
kumaneko |
2915 |
case CCS_NETWORK_TCP_ACCEPT: |
138 |
kumaneko |
111 |
keyword = "TCP accept"; |
139 |
|
|
break; |
140 |
kumaneko |
2915 |
case CCS_NETWORK_RAW_BIND: |
141 |
kumaneko |
111 |
keyword = "RAW bind"; |
142 |
|
|
break; |
143 |
kumaneko |
2915 |
case CCS_NETWORK_RAW_CONNECT: |
144 |
kumaneko |
111 |
keyword = "RAW connect"; |
145 |
|
|
break; |
146 |
|
|
} |
147 |
|
|
return keyword; |
148 |
|
|
} |
149 |
|
|
|
150 |
kumaneko |
1052 |
/** |
151 |
kumaneko |
2922 |
* ccs_network_entry2 - Check permission for network operation. |
152 |
kumaneko |
1052 |
* |
153 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
154 |
|
|
* @operation: Type of operation. |
155 |
|
|
* @address: An IPv4 or IPv6 address. |
156 |
|
|
* @port: Port number. |
157 |
|
|
* |
158 |
|
|
* Returns 0 on success, negative value otherwise. |
159 |
kumaneko |
2690 |
* |
160 |
kumaneko |
2828 |
* Caller holds ccs_read_lock(). |
161 |
kumaneko |
1052 |
*/ |
162 |
kumaneko |
2922 |
static int ccs_network_entry2(const bool is_ipv6, const u8 operation, |
163 |
kumaneko |
2943 |
const u32 *address, const u16 port) |
164 |
kumaneko |
111 |
{ |
165 |
kumaneko |
1657 |
struct ccs_request_info r; |
166 |
kumaneko |
2002 |
struct ccs_acl_info *ptr; |
167 |
kumaneko |
1052 |
const char *keyword = ccs_net2keyword(operation); |
168 |
kumaneko |
2916 |
const u16 perm = 1 << operation; |
169 |
kumaneko |
1052 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
170 |
|
|
const u32 ip = ntohl(*address); |
171 |
kumaneko |
2897 |
int error; |
172 |
kumaneko |
1064 |
char buf[64]; |
173 |
kumaneko |
2943 |
if (ccs_init_request_info(&r, NULL, |
174 |
|
|
CCS_MAC_NETWORK_UDP_BIND + operation) |
175 |
kumaneko |
2958 |
== CCS_CONFIG_DISABLED) |
176 |
kumaneko |
1052 |
return 0; |
177 |
kumaneko |
2943 |
memset(buf, 0, sizeof(buf)); |
178 |
|
|
if (is_ipv6) |
179 |
|
|
ccs_print_ipv6(buf, sizeof(buf), (const struct in6_addr *) |
180 |
|
|
address); |
181 |
|
|
else |
182 |
|
|
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
183 |
|
|
do { |
184 |
|
|
error = -EPERM; |
185 |
|
|
list_for_each_entry_rcu(ptr, &r.domain->acl_info_list, list) { |
186 |
|
|
struct ccs_ip_network_acl *acl; |
187 |
|
|
if (ptr->is_deleted || |
188 |
|
|
ptr->type != CCS_TYPE_IP_NETWORK_ACL) |
189 |
kumaneko |
1052 |
continue; |
190 |
kumaneko |
2943 |
acl = container_of(ptr, struct ccs_ip_network_acl, |
191 |
|
|
head); |
192 |
|
|
if (!(acl->perm & perm)) |
193 |
kumaneko |
1052 |
continue; |
194 |
kumaneko |
2943 |
if (!ccs_compare_number_union(port, &acl->port) || |
195 |
|
|
!ccs_condition(&r, ptr)) |
196 |
kumaneko |
1052 |
continue; |
197 |
kumaneko |
2943 |
switch (acl->address_type) { |
198 |
|
|
case CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP: |
199 |
|
|
if (!ccs_address_matches_group(is_ipv6, |
200 |
|
|
address, |
201 |
|
|
acl->address. |
202 |
|
|
group)) |
203 |
|
|
continue; |
204 |
|
|
break; |
205 |
|
|
case CCS_IP_ADDRESS_TYPE_IPv4: |
206 |
|
|
if (is_ipv6 || ip < acl->address.ipv4.min || |
207 |
|
|
acl->address.ipv4.max < ip) |
208 |
|
|
continue; |
209 |
|
|
break; |
210 |
|
|
default: |
211 |
|
|
if (!is_ipv6 || |
212 |
|
|
memcmp(acl->address.ipv6.min, address, 16) |
213 |
|
|
> 0 || |
214 |
|
|
memcmp(address, acl->address.ipv6.max, 16) |
215 |
|
|
> 0) |
216 |
|
|
continue; |
217 |
|
|
break; |
218 |
|
|
} |
219 |
|
|
r.cond = ptr->cond; |
220 |
|
|
error = 0; |
221 |
|
|
break; |
222 |
kumaneko |
111 |
} |
223 |
kumaneko |
2943 |
ccs_audit_network_log(&r, keyword, buf, port, !error); |
224 |
|
|
if (!error) |
225 |
|
|
break; |
226 |
kumaneko |
2922 |
error = ccs_supervisor(&r, CCS_KEYWORD_ALLOW_NETWORK |
227 |
kumaneko |
2943 |
"%s %s %u\n", keyword, buf, port); |
228 |
kumaneko |
3494 |
} while (error == CCS_RETRY_REQUEST); |
229 |
kumaneko |
2958 |
if (r.mode != CCS_CONFIG_ENFORCING) |
230 |
kumaneko |
2897 |
error = 0; |
231 |
|
|
return error; |
232 |
kumaneko |
111 |
} |
233 |
|
|
|
234 |
kumaneko |
1052 |
/** |
235 |
kumaneko |
2922 |
* ccs_network_entry - Check permission for network operation. |
236 |
kumaneko |
2702 |
* |
237 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
238 |
|
|
* @operation: Type of operation. |
239 |
|
|
* @address: An IPv4 or IPv6 address. |
240 |
|
|
* @port: Port number. |
241 |
|
|
* |
242 |
|
|
* Returns 0 on success, negative value otherwise. |
243 |
|
|
*/ |
244 |
kumaneko |
2922 |
static int ccs_network_entry(const bool is_ipv6, const u8 operation, |
245 |
kumaneko |
2943 |
const u32 *address, const u16 port) |
246 |
kumaneko |
2702 |
{ |
247 |
kumaneko |
2828 |
const int idx = ccs_read_lock(); |
248 |
kumaneko |
3046 |
const int error = ccs_network_entry2(is_ipv6, operation, address, |
249 |
|
|
port); |
250 |
kumaneko |
2828 |
ccs_read_unlock(idx); |
251 |
kumaneko |
2702 |
return error; |
252 |
|
|
} |
253 |
|
|
|
254 |
|
|
/** |
255 |
kumaneko |
2915 |
* ccs_write_network_policy - Write "struct ccs_ip_network_acl" list. |
256 |
kumaneko |
1052 |
* |
257 |
|
|
* @data: String to parse. |
258 |
kumaneko |
2282 |
* @domain: Pointer to "struct ccs_domain_info". |
259 |
kumaneko |
2576 |
* @condition: Pointer to "struct ccs_condition". May be NULL. |
260 |
kumaneko |
1052 |
* @is_delete: True if it is a delete request. |
261 |
|
|
* |
262 |
|
|
* Returns 0 on success, negative value otherwise. |
263 |
|
|
*/ |
264 |
kumaneko |
2282 |
int ccs_write_network_policy(char *data, struct ccs_domain_info *domain, |
265 |
kumaneko |
2576 |
struct ccs_condition *condition, |
266 |
kumaneko |
1052 |
const bool is_delete) |
267 |
kumaneko |
111 |
{ |
268 |
kumaneko |
2900 |
struct ccs_acl_info *ptr; |
269 |
kumaneko |
2915 |
struct ccs_ip_network_acl e = { |
270 |
kumaneko |
2900 |
.head.type = CCS_TYPE_IP_NETWORK_ACL, |
271 |
|
|
.head.cond = condition, |
272 |
|
|
}; |
273 |
|
|
u16 min_address[8]; |
274 |
|
|
u16 max_address[8]; |
275 |
|
|
int error = is_delete ? -ENOENT : -ENOMEM; |
276 |
|
|
u8 sock_type; |
277 |
kumaneko |
2779 |
char *w[4]; |
278 |
|
|
if (!ccs_tokenize(data, w, sizeof(w)) || !w[3][0]) |
279 |
kumaneko |
2870 |
return -EINVAL; |
280 |
kumaneko |
2900 |
if (!strcmp(w[0], "TCP")) |
281 |
|
|
sock_type = SOCK_STREAM; |
282 |
|
|
else if (!strcmp(w[0], "UDP")) |
283 |
|
|
sock_type = SOCK_DGRAM; |
284 |
|
|
else if (!strcmp(w[0], "RAW")) |
285 |
|
|
sock_type = SOCK_RAW; |
286 |
|
|
else |
287 |
|
|
return -EINVAL; |
288 |
|
|
if (!strcmp(w[1], "bind")) |
289 |
|
|
switch (sock_type) { |
290 |
|
|
case SOCK_STREAM: |
291 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_TCP_BIND; |
292 |
kumaneko |
2900 |
break; |
293 |
|
|
case SOCK_DGRAM: |
294 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_UDP_BIND; |
295 |
kumaneko |
2900 |
break; |
296 |
|
|
default: |
297 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_RAW_BIND; |
298 |
kumaneko |
2900 |
break; |
299 |
|
|
} |
300 |
|
|
else if (!strcmp(w[1], "connect")) |
301 |
|
|
switch (sock_type) { |
302 |
|
|
case SOCK_STREAM: |
303 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_TCP_CONNECT; |
304 |
kumaneko |
2900 |
break; |
305 |
|
|
case SOCK_DGRAM: |
306 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_UDP_CONNECT; |
307 |
kumaneko |
2900 |
break; |
308 |
|
|
default: |
309 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_RAW_CONNECT; |
310 |
kumaneko |
2900 |
break; |
311 |
|
|
} |
312 |
|
|
else if (sock_type == SOCK_STREAM && !strcmp(w[1], "listen")) |
313 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_TCP_LISTEN; |
314 |
kumaneko |
2900 |
else if (sock_type == SOCK_STREAM && !strcmp(w[1], "accept")) |
315 |
kumaneko |
2916 |
e.perm = 1 << CCS_NETWORK_TCP_ACCEPT; |
316 |
kumaneko |
2900 |
else |
317 |
|
|
return -EINVAL; |
318 |
|
|
switch (ccs_parse_ip_address(w[2], min_address, max_address)) { |
319 |
|
|
case 2: |
320 |
kumaneko |
2916 |
e.address_type = CCS_IP_ADDRESS_TYPE_IPv6; |
321 |
kumaneko |
2900 |
e.address.ipv6.min = ccs_get_ipv6_address((struct in6_addr *) |
322 |
|
|
min_address); |
323 |
|
|
e.address.ipv6.max = ccs_get_ipv6_address((struct in6_addr *) |
324 |
|
|
max_address); |
325 |
|
|
if (!e.address.ipv6.min || !e.address.ipv6.max) |
326 |
|
|
goto out; |
327 |
|
|
break; |
328 |
|
|
case 1: |
329 |
kumaneko |
2916 |
e.address_type = CCS_IP_ADDRESS_TYPE_IPv4; |
330 |
kumaneko |
2900 |
/* use host byte order to allow u32 comparison.*/ |
331 |
kumaneko |
2943 |
e.address.ipv4.min = ntohl(*(u32 *) min_address); |
332 |
|
|
e.address.ipv4.max = ntohl(*(u32 *) max_address); |
333 |
kumaneko |
2900 |
break; |
334 |
|
|
default: |
335 |
|
|
if (w[2][0] != '@') |
336 |
|
|
return -EINVAL; |
337 |
kumaneko |
2916 |
e.address_type = CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP; |
338 |
kumaneko |
2900 |
e.address.group = ccs_get_address_group(w[2] + 1); |
339 |
|
|
if (!e.address.group) |
340 |
|
|
return -ENOMEM; |
341 |
|
|
break; |
342 |
|
|
} |
343 |
|
|
if (!ccs_parse_number_union(w[3], &e.port)) |
344 |
|
|
goto out; |
345 |
kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
346 |
|
|
goto out; |
347 |
kumaneko |
2900 |
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
348 |
kumaneko |
2915 |
struct ccs_ip_network_acl *acl = |
349 |
kumaneko |
3494 |
container_of(ptr, struct ccs_ip_network_acl, head); |
350 |
kumaneko |
3538 |
if (!ccs_is_same_ip_network_acl(acl, &e)) |
351 |
kumaneko |
2900 |
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 |
kumaneko |
3512 |
if (!is_delete && error) { |
366 |
|
|
struct ccs_ip_network_acl *entry = |
367 |
|
|
ccs_commit_ok(&e, sizeof(e)); |
368 |
|
|
if (entry) { |
369 |
|
|
ccs_add_domain_acl(domain, &entry->head); |
370 |
|
|
error = 0; |
371 |
|
|
} |
372 |
kumaneko |
2900 |
} |
373 |
|
|
mutex_unlock(&ccs_policy_lock); |
374 |
|
|
out: |
375 |
|
|
if (w[2][0] == '@') |
376 |
|
|
ccs_put_address_group(e.address.group); |
377 |
kumaneko |
2916 |
else if (e.address_type == CCS_IP_ADDRESS_TYPE_IPv6) { |
378 |
kumaneko |
2900 |
ccs_put_ipv6_address(e.address.ipv6.min); |
379 |
|
|
ccs_put_ipv6_address(e.address.ipv6.max); |
380 |
|
|
} |
381 |
|
|
ccs_put_number_union(&e.port); |
382 |
|
|
return error; |
383 |
kumaneko |
111 |
} |
384 |
|
|
|
385 |
kumaneko |
1052 |
/** |
386 |
kumaneko |
2922 |
* ccs_network_listen_acl - Check permission for listen() operation. |
387 |
kumaneko |
1052 |
* |
388 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
389 |
|
|
* @address: An IPv4 or IPv6 address. |
390 |
|
|
* @port: Port number. |
391 |
|
|
* |
392 |
|
|
* Returns 0 on success, negative value otherwise. |
393 |
|
|
*/ |
394 |
kumaneko |
3625 |
static int ccs_network_listen_acl(const bool is_ipv6, const u8 *address, |
395 |
|
|
const u16 port) |
396 |
kumaneko |
111 |
{ |
397 |
kumaneko |
2922 |
return ccs_network_entry(is_ipv6, CCS_NETWORK_TCP_LISTEN, |
398 |
kumaneko |
2943 |
(const u32 *) address, ntohs(port)); |
399 |
kumaneko |
111 |
} |
400 |
|
|
|
401 |
kumaneko |
1052 |
/** |
402 |
kumaneko |
2922 |
* ccs_network_connect_acl - Check permission for connect() operation. |
403 |
kumaneko |
1052 |
* |
404 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
405 |
|
|
* @sock_type: Type of socket. (TCP or UDP or RAW) |
406 |
|
|
* @address: An IPv4 or IPv6 address. |
407 |
|
|
* @port: Port number. |
408 |
|
|
* |
409 |
|
|
* Returns 0 on success, negative value otherwise. |
410 |
|
|
*/ |
411 |
kumaneko |
3625 |
static int ccs_network_connect_acl(const bool is_ipv6, const int sock_type, |
412 |
|
|
const u8 *address, const u16 port) |
413 |
kumaneko |
111 |
{ |
414 |
kumaneko |
1052 |
u8 operation; |
415 |
|
|
switch (sock_type) { |
416 |
|
|
case SOCK_STREAM: |
417 |
kumaneko |
2915 |
operation = CCS_NETWORK_TCP_CONNECT; |
418 |
kumaneko |
1052 |
break; |
419 |
|
|
case SOCK_DGRAM: |
420 |
kumaneko |
2915 |
operation = CCS_NETWORK_UDP_CONNECT; |
421 |
kumaneko |
1052 |
break; |
422 |
|
|
default: |
423 |
kumaneko |
2915 |
operation = CCS_NETWORK_RAW_CONNECT; |
424 |
kumaneko |
1052 |
} |
425 |
kumaneko |
2922 |
return ccs_network_entry(is_ipv6, operation, |
426 |
kumaneko |
2943 |
(const u32 *) address, ntohs(port)); |
427 |
kumaneko |
111 |
} |
428 |
|
|
|
429 |
kumaneko |
1052 |
/** |
430 |
kumaneko |
2922 |
* ccs_network_bind_acl - Check permission for bind() operation. |
431 |
kumaneko |
1052 |
* |
432 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
433 |
|
|
* @sock_type: Type of socket. (TCP or UDP or RAW) |
434 |
|
|
* @address: An IPv4 or IPv6 address. |
435 |
|
|
* @port: Port number. |
436 |
|
|
* |
437 |
|
|
* Returns 0 on success, negative value otherwise. |
438 |
|
|
*/ |
439 |
kumaneko |
2922 |
static int ccs_network_bind_acl(const bool is_ipv6, const int sock_type, |
440 |
kumaneko |
2943 |
const u8 *address, const u16 port) |
441 |
kumaneko |
111 |
{ |
442 |
kumaneko |
1052 |
u8 operation; |
443 |
|
|
switch (sock_type) { |
444 |
|
|
case SOCK_STREAM: |
445 |
kumaneko |
2915 |
operation = CCS_NETWORK_TCP_BIND; |
446 |
kumaneko |
1052 |
break; |
447 |
|
|
case SOCK_DGRAM: |
448 |
kumaneko |
2915 |
operation = CCS_NETWORK_UDP_BIND; |
449 |
kumaneko |
1052 |
break; |
450 |
|
|
default: |
451 |
kumaneko |
2915 |
operation = CCS_NETWORK_RAW_BIND; |
452 |
kumaneko |
1052 |
} |
453 |
kumaneko |
2922 |
return ccs_network_entry(is_ipv6, operation, |
454 |
kumaneko |
2943 |
(const u32 *) address, ntohs(port)); |
455 |
kumaneko |
111 |
} |
456 |
|
|
|
457 |
kumaneko |
1052 |
/** |
458 |
kumaneko |
2922 |
* ccs_network_accept_acl - Check permission for accept() operation. |
459 |
kumaneko |
1052 |
* |
460 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
461 |
|
|
* @address: An IPv4 or IPv6 address. |
462 |
|
|
* @port: Port number. |
463 |
|
|
* |
464 |
|
|
* Returns 0 on success, negative value otherwise. |
465 |
|
|
*/ |
466 |
kumaneko |
3625 |
static int ccs_network_accept_acl(const bool is_ipv6, const u8 *address, |
467 |
|
|
const u16 port) |
468 |
kumaneko |
111 |
{ |
469 |
kumaneko |
708 |
int retval; |
470 |
kumaneko |
2282 |
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
471 |
kumaneko |
2922 |
retval = ccs_network_entry(is_ipv6, CCS_NETWORK_TCP_ACCEPT, |
472 |
kumaneko |
2943 |
(const u32 *) address, ntohs(port)); |
473 |
kumaneko |
2282 |
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
474 |
kumaneko |
708 |
return retval; |
475 |
kumaneko |
111 |
} |
476 |
|
|
|
477 |
kumaneko |
1052 |
/** |
478 |
kumaneko |
2922 |
* ccs_network_sendmsg_acl - Check permission for sendmsg() operation. |
479 |
kumaneko |
1052 |
* |
480 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
481 |
|
|
* @sock_type: Type of socket. (UDP or RAW) |
482 |
|
|
* @address: An IPv4 or IPv6 address. |
483 |
|
|
* @port: Port number. |
484 |
|
|
* |
485 |
|
|
* Returns 0 on success, negative value otherwise. |
486 |
|
|
*/ |
487 |
kumaneko |
3625 |
static int ccs_network_sendmsg_acl(const bool is_ipv6, const int sock_type, |
488 |
|
|
const u8 *address, const u16 port) |
489 |
kumaneko |
111 |
{ |
490 |
kumaneko |
1052 |
u8 operation; |
491 |
|
|
if (sock_type == SOCK_DGRAM) |
492 |
kumaneko |
2915 |
operation = CCS_NETWORK_UDP_CONNECT; |
493 |
kumaneko |
1052 |
else |
494 |
kumaneko |
2915 |
operation = CCS_NETWORK_RAW_CONNECT; |
495 |
kumaneko |
2922 |
return ccs_network_entry(is_ipv6, operation, |
496 |
kumaneko |
2943 |
(const u32 *) address, ntohs(port)); |
497 |
kumaneko |
111 |
} |
498 |
|
|
|
499 |
kumaneko |
1052 |
/** |
500 |
kumaneko |
2922 |
* ccs_network_recvmsg_acl - Check permission for recvmsg() operation. |
501 |
kumaneko |
1052 |
* |
502 |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
503 |
|
|
* @sock_type: Type of socket. (UDP or RAW) |
504 |
|
|
* @address: An IPv4 or IPv6 address. |
505 |
|
|
* @port: Port number. |
506 |
|
|
* |
507 |
|
|
* Returns 0 on success, negative value otherwise. |
508 |
|
|
*/ |
509 |
kumaneko |
3625 |
static int ccs_network_recvmsg_acl(const bool is_ipv6, const int sock_type, |
510 |
|
|
const u8 *address, const u16 port) |
511 |
kumaneko |
111 |
{ |
512 |
kumaneko |
708 |
int retval; |
513 |
kumaneko |
1052 |
const u8 operation |
514 |
kumaneko |
1064 |
= (sock_type == SOCK_DGRAM) ? |
515 |
kumaneko |
2915 |
CCS_NETWORK_UDP_CONNECT : CCS_NETWORK_RAW_CONNECT; |
516 |
kumaneko |
2282 |
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
517 |
kumaneko |
2922 |
retval = ccs_network_entry(is_ipv6, operation, |
518 |
kumaneko |
2943 |
(const u32 *) address, ntohs(port)); |
519 |
kumaneko |
2282 |
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
520 |
kumaneko |
708 |
return retval; |
521 |
kumaneko |
111 |
} |
522 |
kumaneko |
2037 |
|
523 |
kumaneko |
3625 |
#ifndef CONFIG_NET |
524 |
|
|
|
525 |
|
|
void __init ccs_network_init(void) |
526 |
|
|
{ |
527 |
|
|
} |
528 |
|
|
|
529 |
|
|
#else |
530 |
|
|
|
531 |
kumaneko |
2037 |
#define MAX_SOCK_ADDR 128 /* net/socket.c */ |
532 |
|
|
|
533 |
|
|
/* Check permission for creating a socket. */ |
534 |
kumaneko |
3502 |
static int __ccs_socket_create_permission(int family, int type, int protocol) |
535 |
kumaneko |
2037 |
{ |
536 |
|
|
int error = 0; |
537 |
|
|
/* Nothing to do if I am a kernel service. */ |
538 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
539 |
|
|
return 0; |
540 |
kumaneko |
2282 |
if (family == PF_PACKET && !ccs_capable(CCS_USE_PACKET_SOCKET)) |
541 |
kumaneko |
2037 |
return -EPERM; |
542 |
kumaneko |
2282 |
if (family == PF_ROUTE && !ccs_capable(CCS_USE_ROUTE_SOCKET)) |
543 |
kumaneko |
2037 |
return -EPERM; |
544 |
|
|
if (family != PF_INET && family != PF_INET6) |
545 |
|
|
return 0; |
546 |
|
|
switch (type) { |
547 |
|
|
case SOCK_STREAM: |
548 |
kumaneko |
2282 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CREATE)) |
549 |
kumaneko |
2037 |
error = -EPERM; |
550 |
|
|
break; |
551 |
|
|
case SOCK_DGRAM: |
552 |
kumaneko |
2282 |
if (!ccs_capable(CCS_USE_INET_DGRAM_SOCKET)) |
553 |
kumaneko |
2037 |
error = -EPERM; |
554 |
|
|
break; |
555 |
|
|
case SOCK_RAW: |
556 |
kumaneko |
2282 |
if (!ccs_capable(CCS_USE_INET_RAW_SOCKET)) |
557 |
kumaneko |
2037 |
error = -EPERM; |
558 |
|
|
break; |
559 |
|
|
} |
560 |
|
|
return error; |
561 |
|
|
} |
562 |
|
|
|
563 |
|
|
/* Check permission for listening a TCP socket. */ |
564 |
kumaneko |
3502 |
static int __ccs_socket_listen_permission(struct socket *sock) |
565 |
kumaneko |
2037 |
{ |
566 |
|
|
int error = 0; |
567 |
|
|
char addr[MAX_SOCK_ADDR]; |
568 |
|
|
int addr_len; |
569 |
|
|
/* Nothing to do if I am a kernel service. */ |
570 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
571 |
|
|
return 0; |
572 |
|
|
if (sock->type != SOCK_STREAM) |
573 |
|
|
return 0; |
574 |
|
|
switch (sock->sk->sk_family) { |
575 |
|
|
case PF_INET: |
576 |
|
|
case PF_INET6: |
577 |
|
|
break; |
578 |
|
|
default: |
579 |
|
|
return 0; |
580 |
|
|
} |
581 |
kumaneko |
2282 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_LISTEN)) |
582 |
kumaneko |
2037 |
return -EPERM; |
583 |
|
|
if (sock->ops->getname(sock, (struct sockaddr *) addr, &addr_len, 0)) |
584 |
|
|
return -EPERM; |
585 |
|
|
switch (((struct sockaddr *) addr)->sa_family) { |
586 |
|
|
struct sockaddr_in6 *addr6; |
587 |
|
|
struct sockaddr_in *addr4; |
588 |
|
|
case AF_INET6: |
589 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
590 |
kumaneko |
2922 |
error = ccs_network_listen_acl(true, |
591 |
kumaneko |
2943 |
addr6->sin6_addr.s6_addr, |
592 |
|
|
addr6->sin6_port); |
593 |
kumaneko |
2037 |
break; |
594 |
|
|
case AF_INET: |
595 |
|
|
addr4 = (struct sockaddr_in *) addr; |
596 |
kumaneko |
2922 |
error = ccs_network_listen_acl(false, |
597 |
kumaneko |
2943 |
(u8 *) &addr4->sin_addr, |
598 |
|
|
addr4->sin_port); |
599 |
kumaneko |
2037 |
break; |
600 |
|
|
} |
601 |
|
|
return error; |
602 |
|
|
} |
603 |
|
|
|
604 |
|
|
/* Check permission for setting the remote IP address/port pair of a socket. */ |
605 |
kumaneko |
3502 |
static int __ccs_socket_connect_permission(struct socket *sock, |
606 |
|
|
struct sockaddr *addr, int addr_len) |
607 |
kumaneko |
2037 |
{ |
608 |
|
|
int error = 0; |
609 |
|
|
const unsigned int type = sock->type; |
610 |
|
|
/* Nothing to do if I am a kernel service. */ |
611 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
612 |
|
|
return 0; |
613 |
|
|
switch (type) { |
614 |
|
|
case SOCK_STREAM: |
615 |
|
|
case SOCK_DGRAM: |
616 |
|
|
case SOCK_RAW: |
617 |
|
|
break; |
618 |
|
|
default: |
619 |
|
|
return 0; |
620 |
|
|
} |
621 |
|
|
switch (addr->sa_family) { |
622 |
|
|
struct sockaddr_in6 *addr6; |
623 |
|
|
struct sockaddr_in *addr4; |
624 |
|
|
u16 port; |
625 |
|
|
case AF_INET6: |
626 |
|
|
if (addr_len < SIN6_LEN_RFC2133) |
627 |
|
|
break; |
628 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
629 |
|
|
if (type != SOCK_RAW) |
630 |
|
|
port = addr6->sin6_port; |
631 |
|
|
else |
632 |
|
|
port = htons(sock->sk->sk_protocol); |
633 |
kumaneko |
2922 |
error = ccs_network_connect_acl(true, type, |
634 |
kumaneko |
2943 |
addr6->sin6_addr.s6_addr, |
635 |
|
|
port); |
636 |
kumaneko |
2037 |
break; |
637 |
|
|
case AF_INET: |
638 |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
639 |
|
|
break; |
640 |
|
|
addr4 = (struct sockaddr_in *) addr; |
641 |
|
|
if (type != SOCK_RAW) |
642 |
|
|
port = addr4->sin_port; |
643 |
|
|
else |
644 |
|
|
port = htons(sock->sk->sk_protocol); |
645 |
kumaneko |
2922 |
error = ccs_network_connect_acl(false, type, |
646 |
kumaneko |
2943 |
(u8 *) &addr4->sin_addr, |
647 |
|
|
port); |
648 |
kumaneko |
2037 |
break; |
649 |
|
|
} |
650 |
|
|
if (type != SOCK_STREAM) |
651 |
|
|
return error; |
652 |
|
|
switch (sock->sk->sk_family) { |
653 |
|
|
case PF_INET: |
654 |
|
|
case PF_INET6: |
655 |
kumaneko |
2282 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CONNECT)) |
656 |
kumaneko |
2037 |
error = -EPERM; |
657 |
|
|
break; |
658 |
|
|
} |
659 |
|
|
return error; |
660 |
|
|
} |
661 |
|
|
|
662 |
|
|
/* Check permission for setting the local IP address/port pair of a socket. */ |
663 |
kumaneko |
3502 |
static int __ccs_socket_bind_permission(struct socket *sock, |
664 |
|
|
struct sockaddr *addr, int addr_len) |
665 |
kumaneko |
2037 |
{ |
666 |
|
|
int error = 0; |
667 |
|
|
const unsigned int type = sock->type; |
668 |
|
|
/* Nothing to do if I am a kernel service. */ |
669 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
670 |
|
|
return 0; |
671 |
|
|
switch (type) { |
672 |
|
|
case SOCK_STREAM: |
673 |
|
|
case SOCK_DGRAM: |
674 |
|
|
case SOCK_RAW: |
675 |
|
|
break; |
676 |
|
|
default: |
677 |
|
|
return 0; |
678 |
|
|
} |
679 |
|
|
switch (addr->sa_family) { |
680 |
|
|
struct sockaddr_in6 *addr6; |
681 |
|
|
struct sockaddr_in *addr4; |
682 |
|
|
u16 port; |
683 |
|
|
case AF_INET6: |
684 |
|
|
if (addr_len < SIN6_LEN_RFC2133) |
685 |
|
|
break; |
686 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
687 |
|
|
if (type != SOCK_RAW) |
688 |
|
|
port = addr6->sin6_port; |
689 |
|
|
else |
690 |
|
|
port = htons(sock->sk->sk_protocol); |
691 |
kumaneko |
2922 |
error = ccs_network_bind_acl(true, type, |
692 |
kumaneko |
2943 |
addr6->sin6_addr.s6_addr, |
693 |
|
|
port); |
694 |
kumaneko |
2037 |
break; |
695 |
|
|
case AF_INET: |
696 |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
697 |
|
|
break; |
698 |
|
|
addr4 = (struct sockaddr_in *) addr; |
699 |
|
|
if (type != SOCK_RAW) |
700 |
|
|
port = addr4->sin_port; |
701 |
|
|
else |
702 |
|
|
port = htons(sock->sk->sk_protocol); |
703 |
kumaneko |
2922 |
error = ccs_network_bind_acl(false, type, |
704 |
kumaneko |
2943 |
(u8 *) &addr4->sin_addr, |
705 |
|
|
port); |
706 |
kumaneko |
2037 |
break; |
707 |
|
|
} |
708 |
|
|
return error; |
709 |
|
|
} |
710 |
|
|
|
711 |
|
|
/* |
712 |
|
|
* Check permission for accepting a TCP socket. |
713 |
|
|
* |
714 |
|
|
* Currently, the LSM hook for this purpose is not provided. |
715 |
|
|
*/ |
716 |
kumaneko |
3502 |
static int __ccs_socket_accept_permission(struct socket *sock, |
717 |
|
|
struct sockaddr *addr) |
718 |
kumaneko |
2037 |
{ |
719 |
|
|
int error = 0; |
720 |
|
|
int addr_len; |
721 |
|
|
/* Nothing to do if I am a kernel service. */ |
722 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
723 |
|
|
return 0; |
724 |
|
|
switch (sock->sk->sk_family) { |
725 |
|
|
case PF_INET: |
726 |
|
|
case PF_INET6: |
727 |
|
|
break; |
728 |
|
|
default: |
729 |
|
|
return 0; |
730 |
|
|
} |
731 |
|
|
error = sock->ops->getname(sock, addr, &addr_len, 2); |
732 |
|
|
if (error) |
733 |
|
|
return error; |
734 |
|
|
switch (addr->sa_family) { |
735 |
|
|
struct sockaddr_in6 *addr6; |
736 |
|
|
struct sockaddr_in *addr4; |
737 |
|
|
case AF_INET6: |
738 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
739 |
kumaneko |
2922 |
error = ccs_network_accept_acl(true, |
740 |
kumaneko |
2943 |
addr6->sin6_addr.s6_addr, |
741 |
|
|
addr6->sin6_port); |
742 |
kumaneko |
2037 |
break; |
743 |
|
|
case AF_INET: |
744 |
|
|
addr4 = (struct sockaddr_in *) addr; |
745 |
kumaneko |
2922 |
error = ccs_network_accept_acl(false, |
746 |
kumaneko |
2943 |
(u8 *) &addr4->sin_addr, |
747 |
|
|
addr4->sin_port); |
748 |
kumaneko |
2037 |
break; |
749 |
|
|
} |
750 |
|
|
return error; |
751 |
|
|
} |
752 |
|
|
|
753 |
|
|
/* Check permission for sending a datagram via a UDP or RAW socket. */ |
754 |
kumaneko |
3502 |
static int __ccs_socket_sendmsg_permission(struct socket *sock, |
755 |
|
|
struct msghdr *msg, int size) |
756 |
kumaneko |
2037 |
{ |
757 |
kumaneko |
3075 |
struct sockaddr *addr = (struct sockaddr *) msg->msg_name; |
758 |
|
|
const int addr_len = msg->msg_namelen; |
759 |
kumaneko |
2037 |
int error = 0; |
760 |
|
|
const int type = sock->type; |
761 |
|
|
/* Nothing to do if I am a kernel service. */ |
762 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
763 |
|
|
return 0; |
764 |
|
|
if (!addr || (type != SOCK_DGRAM && type != SOCK_RAW)) |
765 |
|
|
return 0; |
766 |
|
|
switch (addr->sa_family) { |
767 |
|
|
struct sockaddr_in6 *addr6; |
768 |
|
|
struct sockaddr_in *addr4; |
769 |
|
|
u16 port; |
770 |
|
|
case AF_INET6: |
771 |
|
|
if (addr_len < SIN6_LEN_RFC2133) |
772 |
|
|
break; |
773 |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
774 |
|
|
if (type == SOCK_DGRAM) |
775 |
|
|
port = addr6->sin6_port; |
776 |
|
|
else |
777 |
|
|
port = htons(sock->sk->sk_protocol); |
778 |
kumaneko |
2922 |
error = ccs_network_sendmsg_acl(true, type, |
779 |
kumaneko |
2943 |
addr6->sin6_addr.s6_addr, |
780 |
|
|
port); |
781 |
kumaneko |
2037 |
break; |
782 |
|
|
case AF_INET: |
783 |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
784 |
|
|
break; |
785 |
|
|
addr4 = (struct sockaddr_in *) addr; |
786 |
|
|
if (type == SOCK_DGRAM) |
787 |
|
|
port = addr4->sin_port; |
788 |
|
|
else |
789 |
|
|
port = htons(sock->sk->sk_protocol); |
790 |
kumaneko |
2922 |
error = ccs_network_sendmsg_acl(false, type, |
791 |
kumaneko |
3046 |
(u8 *) &addr4->sin_addr, port); |
792 |
kumaneko |
2037 |
break; |
793 |
|
|
} |
794 |
|
|
return error; |
795 |
|
|
} |
796 |
|
|
|
797 |
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) |
798 |
|
|
#if !defined(RHEL_MAJOR) || RHEL_MAJOR != 5 |
799 |
kumaneko |
3018 |
#if !defined(AX_MAJOR) || AX_MAJOR != 3 || !defined(AX_MINOR) || AX_MINOR < 2 |
800 |
kumaneko |
2037 |
|
801 |
|
|
static inline struct iphdr *ip_hdr(const struct sk_buff *skb) |
802 |
|
|
{ |
803 |
|
|
return skb->nh.iph; |
804 |
|
|
} |
805 |
|
|
|
806 |
|
|
static inline struct udphdr *udp_hdr(const struct sk_buff *skb) |
807 |
|
|
{ |
808 |
|
|
return skb->h.uh; |
809 |
|
|
} |
810 |
|
|
|
811 |
|
|
static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) |
812 |
|
|
{ |
813 |
|
|
return skb->nh.ipv6h; |
814 |
|
|
} |
815 |
|
|
|
816 |
|
|
#endif |
817 |
|
|
#endif |
818 |
kumaneko |
3018 |
#endif |
819 |
kumaneko |
2037 |
|
820 |
kumaneko |
2459 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 12) |
821 |
|
|
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
822 |
|
|
unsigned int flags) |
823 |
|
|
{ |
824 |
|
|
/* Clear queue. */ |
825 |
|
|
if (flags & MSG_PEEK) { |
826 |
|
|
int clear = 0; |
827 |
|
|
spin_lock_irq(&sk->sk_receive_queue.lock); |
828 |
|
|
if (skb == skb_peek(&sk->sk_receive_queue)) { |
829 |
|
|
__skb_unlink(skb, &sk->sk_receive_queue); |
830 |
|
|
clear = 1; |
831 |
|
|
} |
832 |
|
|
spin_unlock_irq(&sk->sk_receive_queue.lock); |
833 |
|
|
if (clear) |
834 |
|
|
kfree_skb(skb); |
835 |
|
|
} |
836 |
kumaneko |
2570 |
skb_free_datagram(sk, skb); |
837 |
kumaneko |
2459 |
} |
838 |
|
|
#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16) |
839 |
|
|
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
840 |
|
|
unsigned int flags) |
841 |
|
|
{ |
842 |
|
|
/* Clear queue. */ |
843 |
|
|
if (flags & MSG_PEEK) { |
844 |
|
|
int clear = 0; |
845 |
|
|
spin_lock_bh(&sk->sk_receive_queue.lock); |
846 |
|
|
if (skb == skb_peek(&sk->sk_receive_queue)) { |
847 |
|
|
__skb_unlink(skb, &sk->sk_receive_queue); |
848 |
|
|
clear = 1; |
849 |
|
|
} |
850 |
|
|
spin_unlock_bh(&sk->sk_receive_queue.lock); |
851 |
|
|
if (clear) |
852 |
|
|
kfree_skb(skb); |
853 |
|
|
} |
854 |
kumaneko |
2570 |
skb_free_datagram(sk, skb); |
855 |
kumaneko |
2459 |
} |
856 |
|
|
#endif |
857 |
|
|
|
858 |
kumaneko |
2037 |
/* |
859 |
|
|
* Check permission for receiving a datagram via a UDP or RAW socket. |
860 |
|
|
* |
861 |
|
|
* Currently, the LSM hook for this purpose is not provided. |
862 |
|
|
*/ |
863 |
kumaneko |
3502 |
static int __ccs_socket_recvmsg_permission(struct sock *sk, |
864 |
|
|
struct sk_buff *skb, |
865 |
|
|
const unsigned int flags) |
866 |
kumaneko |
2037 |
{ |
867 |
|
|
int error = 0; |
868 |
|
|
const unsigned int type = sk->sk_type; |
869 |
kumaneko |
2459 |
if (type != SOCK_DGRAM && type != SOCK_RAW) |
870 |
kumaneko |
2037 |
return 0; |
871 |
|
|
/* Nothing to do if I am a kernel service. */ |
872 |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
873 |
|
|
return 0; |
874 |
|
|
|
875 |
|
|
switch (sk->sk_family) { |
876 |
|
|
struct in6_addr sin6; |
877 |
|
|
struct in_addr sin4; |
878 |
|
|
u16 port; |
879 |
|
|
case PF_INET6: |
880 |
|
|
if (type == SOCK_DGRAM) { /* UDP IPv6 */ |
881 |
|
|
if (skb->protocol == htons(ETH_P_IP)) { |
882 |
|
|
ipv6_addr_set(&sin6, 0, 0, htonl(0xffff), |
883 |
|
|
ip_hdr(skb)->saddr); |
884 |
|
|
} else { |
885 |
|
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
886 |
|
|
} |
887 |
|
|
port = udp_hdr(skb)->source; |
888 |
|
|
} else { /* RAW IPv6 */ |
889 |
|
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
890 |
|
|
port = htons(sk->sk_protocol); |
891 |
|
|
} |
892 |
kumaneko |
2922 |
error = ccs_network_recvmsg_acl(true, type, |
893 |
kumaneko |
2943 |
(u8 *) &sin6, port); |
894 |
kumaneko |
2037 |
break; |
895 |
|
|
case PF_INET: |
896 |
|
|
if (type == SOCK_DGRAM) { /* UDP IPv4 */ |
897 |
|
|
sin4.s_addr = ip_hdr(skb)->saddr; |
898 |
|
|
port = udp_hdr(skb)->source; |
899 |
|
|
} else { /* RAW IPv4 */ |
900 |
|
|
sin4.s_addr = ip_hdr(skb)->saddr; |
901 |
|
|
port = htons(sk->sk_protocol); |
902 |
|
|
} |
903 |
kumaneko |
2922 |
error = ccs_network_recvmsg_acl(false, type, |
904 |
kumaneko |
2943 |
(u8 *) &sin4, port); |
905 |
kumaneko |
2037 |
break; |
906 |
|
|
} |
907 |
|
|
if (!error) |
908 |
|
|
return 0; |
909 |
|
|
/* |
910 |
|
|
* Remove from queue if MSG_PEEK is used so that |
911 |
|
|
* the head message from unwanted source in receive queue will not |
912 |
|
|
* prevent the caller from picking up next message from wanted source |
913 |
|
|
* when the caller is using MSG_PEEK flag for picking up. |
914 |
|
|
*/ |
915 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
916 |
kumaneko |
2459 |
if (type == SOCK_DGRAM) |
917 |
|
|
lock_sock(sk); |
918 |
kumaneko |
2037 |
#endif |
919 |
kumaneko |
2459 |
skb_kill_datagram(sk, skb, flags); |
920 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
921 |
|
|
if (type == SOCK_DGRAM) |
922 |
|
|
release_sock(sk); |
923 |
|
|
#endif |
924 |
kumaneko |
2037 |
/* Hope less harmful than -EPERM. */ |
925 |
kumaneko |
2519 |
return -ENOMEM; |
926 |
kumaneko |
2037 |
} |
927 |
kumaneko |
3502 |
|
928 |
|
|
void __init ccs_network_init(void) |
929 |
|
|
{ |
930 |
|
|
ccsecurity_ops.socket_create_permission = |
931 |
|
|
__ccs_socket_create_permission; |
932 |
|
|
ccsecurity_ops.socket_listen_permission = |
933 |
|
|
__ccs_socket_listen_permission; |
934 |
|
|
ccsecurity_ops.socket_connect_permission = |
935 |
|
|
__ccs_socket_connect_permission; |
936 |
|
|
ccsecurity_ops.socket_bind_permission = __ccs_socket_bind_permission; |
937 |
|
|
ccsecurity_ops.socket_accept_permission = |
938 |
|
|
__ccs_socket_accept_permission; |
939 |
|
|
ccsecurity_ops.socket_sendmsg_permission = |
940 |
|
|
__ccs_socket_sendmsg_permission; |
941 |
|
|
ccsecurity_ops.socket_recvmsg_permission = |
942 |
|
|
__ccs_socket_recvmsg_permission; |
943 |
|
|
} |
944 |
kumaneko |
3625 |
|
945 |
|
|
#endif |