3 |
* |
* |
4 |
* Implementation of the Domain-Based Mandatory Access Control. |
* Implementation of the Domain-Based Mandatory Access Control. |
5 |
* |
* |
6 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
7 |
* |
* |
8 |
* Version: 1.6.5-pre 2008/11/04 |
* Version: 1.6.7-rc 2009/03/18 |
9 |
* |
* |
10 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
11 |
* See README.ccs for ChangeLog. |
* See README.ccs for ChangeLog. |
14 |
|
|
15 |
#include <linux/ccs_common.h> |
#include <linux/ccs_common.h> |
16 |
#include <linux/tomoyo.h> |
#include <linux/tomoyo.h> |
17 |
|
#include <linux/tomoyo_socket.h> |
18 |
#include <linux/realpath.h> |
#include <linux/realpath.h> |
19 |
#include <linux/net.h> |
#include <linux/net.h> |
20 |
#include <linux/inet.h> |
#include <linux/inet.h> |
21 |
#include <linux/in.h> |
#include <linux/in.h> |
22 |
#include <linux/in6.h> |
#include <linux/in6.h> |
23 |
|
#include <net/ip.h> |
24 |
|
#include <net/ipv6.h> |
25 |
|
#include <net/udp.h> |
26 |
|
|
27 |
|
/* Index numbers for Network Controls. */ |
28 |
|
enum ccs_network_acl_index { |
29 |
|
NETWORK_ACL_UDP_BIND, |
30 |
|
NETWORK_ACL_UDP_CONNECT, |
31 |
|
NETWORK_ACL_TCP_BIND, |
32 |
|
NETWORK_ACL_TCP_LISTEN, |
33 |
|
NETWORK_ACL_TCP_CONNECT, |
34 |
|
NETWORK_ACL_TCP_ACCEPT, |
35 |
|
NETWORK_ACL_RAW_BIND, |
36 |
|
NETWORK_ACL_RAW_CONNECT |
37 |
|
}; |
38 |
|
|
39 |
/** |
/** |
40 |
* audit_network_log - Audit network log. |
* ccs_audit_network_log - Audit network log. |
41 |
* |
* |
42 |
* @r: Pointer to "struct ccs_request_info". |
* @r: Pointer to "struct ccs_request_info". |
43 |
* @operation: The name of operation. |
* @operation: The name of operation. |
47 |
* |
* |
48 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
49 |
*/ |
*/ |
50 |
static int audit_network_log(struct ccs_request_info *r, const char *operation, |
static int ccs_audit_network_log(struct ccs_request_info *r, |
51 |
const char *address, const u16 port, |
const char *operation, const char *address, |
52 |
const bool is_granted) |
const u16 port, const bool is_granted) |
53 |
{ |
{ |
54 |
return ccs_write_audit_log(is_granted, r, KEYWORD_ALLOW_NETWORK |
return ccs_write_audit_log(is_granted, r, KEYWORD_ALLOW_NETWORK |
55 |
"%s %s %u\n", operation, address, port); |
"%s %s %u\n", operation, address, port); |
56 |
} |
} |
57 |
|
|
58 |
/** |
/** |
59 |
* save_ipv6_address - Keep the given IPv6 address on the RAM. |
* ccs_save_ipv6_address - Keep the given IPv6 address on the RAM. |
60 |
* |
* |
61 |
* @addr: Pointer to "struct in6_addr". |
* @addr: Pointer to "struct in6_addr". |
62 |
* |
* |
64 |
* |
* |
65 |
* The RAM is shared, so NEVER try to modify or kfree() the returned address. |
* The RAM is shared, so NEVER try to modify or kfree() the returned address. |
66 |
*/ |
*/ |
67 |
static const struct in6_addr *save_ipv6_address(const struct in6_addr *addr) |
static const struct in6_addr *ccs_save_ipv6_address(const struct in6_addr *addr) |
68 |
{ |
{ |
69 |
static const u8 block_size = 16; |
static const u8 ccs_block_size = 16; |
70 |
struct addr_list { |
struct ccs_addr_list { |
71 |
/* Workaround for gcc 4.3's bug. */ |
/* Workaround for gcc 4.3's bug. */ |
72 |
struct in6_addr addr[16]; /* = block_size */ |
struct in6_addr addr[16]; /* = ccs_block_size */ |
73 |
struct list1_head list; |
struct list1_head list; |
74 |
u32 in_use_count; |
u32 in_use_count; |
75 |
}; |
}; |
76 |
static LIST1_HEAD(address_list); |
static LIST1_HEAD(ccs_address_list); |
77 |
struct addr_list *ptr; |
struct ccs_addr_list *ptr; |
78 |
static DEFINE_MUTEX(lock); |
static DEFINE_MUTEX(lock); |
79 |
u8 i = block_size; |
u8 i = ccs_block_size; |
80 |
if (!addr) |
if (!addr) |
81 |
return NULL; |
return NULL; |
82 |
mutex_lock(&lock); |
mutex_lock(&lock); |
83 |
list1_for_each_entry(ptr, &address_list, list) { |
list1_for_each_entry(ptr, &ccs_address_list, list) { |
84 |
for (i = 0; i < ptr->in_use_count; i++) { |
for (i = 0; i < ptr->in_use_count; i++) { |
85 |
if (!memcmp(&ptr->addr[i], addr, sizeof(*addr))) |
if (!memcmp(&ptr->addr[i], addr, sizeof(*addr))) |
86 |
goto ok; |
goto ok; |
87 |
} |
} |
88 |
if (i < block_size) |
if (i < ccs_block_size) |
89 |
break; |
break; |
90 |
} |
} |
91 |
if (i == block_size) { |
if (i == ccs_block_size) { |
92 |
ptr = ccs_alloc_element(sizeof(*ptr)); |
ptr = ccs_alloc_element(sizeof(*ptr)); |
93 |
if (!ptr) |
if (!ptr) |
94 |
goto ok; |
goto ok; |
95 |
list1_add_tail_mb(&ptr->list, &address_list); |
list1_add_tail_mb(&ptr->list, &ccs_address_list); |
96 |
i = 0; |
i = 0; |
97 |
} |
} |
98 |
ptr->addr[ptr->in_use_count++] = *addr; |
ptr->addr[ptr->in_use_count++] = *addr; |
101 |
return ptr ? &ptr->addr[i] : NULL; |
return ptr ? &ptr->addr[i] : NULL; |
102 |
} |
} |
103 |
|
|
104 |
/* The list for "struct address_group_entry". */ |
/* The list for "struct ccs_address_group_entry". */ |
105 |
static LIST1_HEAD(address_group_list); |
static LIST1_HEAD(ccs_address_group_list); |
106 |
|
|
107 |
/** |
/** |
108 |
* update_address_group_entry - Update "struct address_group_entry" list. |
* ccs_update_address_group_entry - Update "struct ccs_address_group_entry" list. |
109 |
* |
* |
110 |
* @group_name: The name of address group. |
* @group_name: The name of address group. |
111 |
* @is_ipv6: True if @min_address and @max_address are IPv6 addresses. |
* @is_ipv6: True if @min_address and @max_address are IPv6 addresses. |
115 |
* |
* |
116 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
117 |
*/ |
*/ |
118 |
static int update_address_group_entry(const char *group_name, |
static int ccs_update_address_group_entry(const char *group_name, |
119 |
const bool is_ipv6, |
const bool is_ipv6, |
120 |
const u16 *min_address, |
const u16 *min_address, |
121 |
const u16 *max_address, |
const u16 *max_address, |
122 |
const bool is_delete) |
const bool is_delete) |
123 |
{ |
{ |
124 |
static DEFINE_MUTEX(lock); |
static DEFINE_MUTEX(lock); |
125 |
struct address_group_entry *new_group; |
struct ccs_address_group_entry *new_group; |
126 |
struct address_group_entry *group; |
struct ccs_address_group_entry *group; |
127 |
struct address_group_member *new_member; |
struct ccs_address_group_member *new_member; |
128 |
struct address_group_member *member; |
struct ccs_address_group_member *member; |
129 |
const struct path_info *saved_group_name; |
const struct ccs_path_info *saved_group_name; |
130 |
const struct in6_addr *saved_min_address = NULL; |
const struct in6_addr *saved_min_address = NULL; |
131 |
const struct in6_addr *saved_max_address = NULL; |
const struct in6_addr *saved_max_address = NULL; |
132 |
int error = -ENOMEM; |
int error = -ENOMEM; |
140 |
if (!is_ipv6) |
if (!is_ipv6) |
141 |
goto not_ipv6; |
goto not_ipv6; |
142 |
saved_min_address |
saved_min_address |
143 |
= save_ipv6_address((struct in6_addr *) min_address); |
= ccs_save_ipv6_address((struct in6_addr *) min_address); |
144 |
saved_max_address |
saved_max_address |
145 |
= save_ipv6_address((struct in6_addr *) max_address); |
= ccs_save_ipv6_address((struct in6_addr *) max_address); |
146 |
if (!saved_min_address || !saved_max_address) |
if (!saved_min_address || !saved_max_address) |
147 |
return -ENOMEM; |
return -ENOMEM; |
148 |
not_ipv6: |
not_ipv6: |
149 |
mutex_lock(&lock); |
mutex_lock(&lock); |
150 |
list1_for_each_entry(group, &address_group_list, list) { |
list1_for_each_entry(group, &ccs_address_group_list, list) { |
151 |
if (saved_group_name != group->group_name) |
if (saved_group_name != group->group_name) |
152 |
continue; |
continue; |
153 |
list1_for_each_entry(member, &group->address_group_member_list, |
list1_for_each_entry(member, &group->address_group_member_list, |
180 |
goto out; |
goto out; |
181 |
INIT_LIST1_HEAD(&new_group->address_group_member_list); |
INIT_LIST1_HEAD(&new_group->address_group_member_list); |
182 |
new_group->group_name = saved_group_name; |
new_group->group_name = saved_group_name; |
183 |
list1_add_tail_mb(&new_group->list, &address_group_list); |
list1_add_tail_mb(&new_group->list, &ccs_address_group_list); |
184 |
group = new_group; |
group = new_group; |
185 |
} |
} |
186 |
new_member = ccs_alloc_element(sizeof(*new_member)); |
new_member = ccs_alloc_element(sizeof(*new_member)); |
203 |
} |
} |
204 |
|
|
205 |
/** |
/** |
206 |
* parse_ip_address - Parse an IP address. |
* ccs_parse_ip_address - Parse an IP address. |
207 |
* |
* |
208 |
* @address: String to parse. |
* @address: String to parse. |
209 |
* @min: Pointer to store min address. |
* @min: Pointer to store min address. |
211 |
* |
* |
212 |
* Returns 2 if @address is an IPv6, 1 if @address is an IPv4, 0 otherwise. |
* Returns 2 if @address is an IPv6, 1 if @address is an IPv4, 0 otherwise. |
213 |
*/ |
*/ |
214 |
static int parse_ip_address(char *address, u16 *min, u16 *max) |
static int ccs_parse_ip_address(char *address, u16 *min, u16 *max) |
215 |
{ |
{ |
216 |
int count = sscanf(address, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx" |
int count = sscanf(address, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx" |
217 |
"-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
"-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
246 |
} |
} |
247 |
|
|
248 |
/** |
/** |
249 |
* ccs_write_address_group_policy - Write "struct address_group_entry" list. |
* ccs_write_address_group_policy - Write "struct ccs_address_group_entry" list. |
250 |
* |
* |
251 |
* @data: String to parse. |
* @data: String to parse. |
252 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
262 |
if (!cp) |
if (!cp) |
263 |
return -EINVAL; |
return -EINVAL; |
264 |
*cp++ = '\0'; |
*cp++ = '\0'; |
265 |
switch (parse_ip_address(cp, min_address, max_address)) { |
switch (ccs_parse_ip_address(cp, min_address, max_address)) { |
266 |
case 2: |
case 2: |
267 |
is_ipv6 = true; |
is_ipv6 = true; |
268 |
break; |
break; |
272 |
default: |
default: |
273 |
return -EINVAL; |
return -EINVAL; |
274 |
} |
} |
275 |
return update_address_group_entry(data, is_ipv6, |
return ccs_update_address_group_entry(data, is_ipv6, min_address, |
276 |
min_address, max_address, is_delete); |
max_address, is_delete); |
277 |
} |
} |
278 |
|
|
279 |
/** |
/** |
280 |
* find_or_assign_new_address_group - Create address group. |
* ccs_find_or_assign_new_address_group - Create address group. |
281 |
* |
* |
282 |
* @group_name: The name of address group. |
* @group_name: The name of address group. |
283 |
* |
* |
284 |
* Returns pointer to "struct address_group_entry" on success, NULL otherwise. |
* Returns pointer to "struct ccs_address_group_entry" on success, |
285 |
|
* NULL otherwise. |
286 |
*/ |
*/ |
287 |
static struct address_group_entry * |
static struct ccs_address_group_entry * |
288 |
find_or_assign_new_address_group(const char *group_name) |
ccs_find_or_assign_new_address_group(const char *group_name) |
289 |
{ |
{ |
290 |
u8 i; |
u8 i; |
291 |
struct address_group_entry *group; |
struct ccs_address_group_entry *group; |
292 |
for (i = 0; i <= 1; i++) { |
for (i = 0; i <= 1; i++) { |
293 |
list1_for_each_entry(group, &address_group_list, list) { |
list1_for_each_entry(group, &ccs_address_group_list, list) { |
294 |
if (!strcmp(group_name, group->group_name->name)) |
if (!strcmp(group_name, group->group_name->name)) |
295 |
return group; |
return group; |
296 |
} |
} |
297 |
if (!i) { |
if (!i) { |
298 |
const u16 dummy[2] = { 0, 0 }; |
const u16 dummy[2] = { 0, 0 }; |
299 |
update_address_group_entry(group_name, false, |
ccs_update_address_group_entry(group_name, false, |
300 |
dummy, dummy, false); |
dummy, dummy, false); |
301 |
update_address_group_entry(group_name, false, |
ccs_update_address_group_entry(group_name, false, |
302 |
dummy, dummy, true); |
dummy, dummy, true); |
303 |
} |
} |
304 |
} |
} |
305 |
return NULL; |
return NULL; |
306 |
} |
} |
307 |
|
|
308 |
/** |
/** |
309 |
* address_matches_to_group - Check whether the given address matches members of the given address group. |
* ccs_address_matches_group - Check whether the given address matches members of the given address group. |
310 |
* |
* |
311 |
* @is_ipv6: True if @address is an IPv6 address. |
* @is_ipv6: True if @address is an IPv6 address. |
312 |
* @address: An IPv4 or IPv6 address. |
* @address: An IPv4 or IPv6 address. |
313 |
* @group: Pointer to "struct address_group_entry". |
* @group: Pointer to "struct ccs_address_group_entry". |
314 |
* |
* |
315 |
* Returns true if @address matches addresses in @group group, false otherwise. |
* Returns true if @address matches addresses in @group group, false otherwise. |
316 |
*/ |
*/ |
317 |
static bool address_matches_to_group(const bool is_ipv6, const u32 *address, |
static bool ccs_address_matches_group(const bool is_ipv6, const u32 *address, |
318 |
const struct address_group_entry *group) |
const struct ccs_address_group_entry * |
319 |
|
group) |
320 |
{ |
{ |
321 |
struct address_group_member *member; |
struct ccs_address_group_member *member; |
322 |
const u32 ip = ntohl(*address); |
const u32 ip = ntohl(*address); |
323 |
list1_for_each_entry(member, &group->address_group_member_list, list) { |
list1_for_each_entry(member, &group->address_group_member_list, list) { |
324 |
if (member->is_deleted) |
if (member->is_deleted) |
338 |
} |
} |
339 |
|
|
340 |
/** |
/** |
341 |
* ccs_read_address_group_policy - Read "struct address_group_entry" list. |
* ccs_read_address_group_policy - Read "struct ccs_address_group_entry" list. |
342 |
* |
* |
343 |
* @head: Pointer to "struct ccs_io_buffer". |
* @head: Pointer to "struct ccs_io_buffer". |
344 |
* |
* |
348 |
{ |
{ |
349 |
struct list1_head *gpos; |
struct list1_head *gpos; |
350 |
struct list1_head *mpos; |
struct list1_head *mpos; |
351 |
list1_for_each_cookie(gpos, head->read_var1, &address_group_list) { |
list1_for_each_cookie(gpos, head->read_var1, &ccs_address_group_list) { |
352 |
struct address_group_entry *group; |
struct ccs_address_group_entry *group; |
353 |
group = list1_entry(gpos, struct address_group_entry, list); |
group = list1_entry(gpos, struct ccs_address_group_entry, list); |
354 |
list1_for_each_cookie(mpos, head->read_var2, |
list1_for_each_cookie(mpos, head->read_var2, |
355 |
&group->address_group_member_list) { |
&group->address_group_member_list) { |
356 |
char buf[128]; |
char buf[128]; |
357 |
struct address_group_member *member; |
struct ccs_address_group_member *member; |
358 |
member = list1_entry(mpos, struct address_group_member, |
member = list1_entry(mpos, |
359 |
|
struct ccs_address_group_member, |
360 |
list); |
list); |
361 |
if (member->is_deleted) |
if (member->is_deleted) |
362 |
continue; |
continue; |
368 |
ccs_print_ipv6(buf, sizeof(buf), min_address); |
ccs_print_ipv6(buf, sizeof(buf), min_address); |
369 |
if (min_address != max_address) { |
if (min_address != max_address) { |
370 |
int len; |
int len; |
371 |
char *cp = strchr(buf, '\0'); |
char *cp = buf + strlen(buf); |
372 |
*cp++ = '-'; |
*cp++ = '-'; |
373 |
len = strlen(buf); |
len = strlen(buf); |
374 |
ccs_print_ipv6(cp, sizeof(buf) - len, |
ccs_print_ipv6(cp, sizeof(buf) - len, |
463 |
} |
} |
464 |
|
|
465 |
/** |
/** |
466 |
* update_network_entry - Update "struct ip_network_acl_record" list. |
* ccs_update_network_entry - Update "struct ccs_ip_network_acl_record" list. |
467 |
* |
* |
468 |
* @operation: Type of operation. |
* @operation: Type of operation. |
469 |
* @record_type: Type of address. |
* @record_type: Type of address. |
470 |
* @group: Pointer to "struct address_group_entry". May be NULL. |
* @group: Pointer to "struct ccs_address_group_entry". May be NULL. |
471 |
* @min_address: Start of IPv4 or IPv6 address range. |
* @min_address: Start of IPv4 or IPv6 address range. |
472 |
* @max_address: End of IPv4 or IPv6 address range. |
* @max_address: End of IPv4 or IPv6 address range. |
473 |
* @min_port: Start of port number range. |
* @min_port: Start of port number range. |
474 |
* @max_port: End of port number range. |
* @max_port: End of port number range. |
475 |
* @domain: Pointer to "struct domain_info". |
* @domain: Pointer to "struct ccs_domain_info". |
476 |
* @condition: Pointer to "struct condition_list". May be NULL. |
* @condition: Pointer to "struct ccs_condition_list". May be NULL. |
477 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
478 |
* |
* |
479 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
480 |
*/ |
*/ |
481 |
static int update_network_entry(const u8 operation, const u8 record_type, |
static int ccs_update_network_entry(const u8 operation, const u8 record_type, |
482 |
const struct address_group_entry *group, |
const struct ccs_address_group_entry *group, |
483 |
const u32 *min_address, const u32 *max_address, |
const u32 *min_address, |
484 |
const u16 min_port, const u16 max_port, |
const u32 *max_address, |
485 |
struct domain_info *domain, |
const u16 min_port, const u16 max_port, |
486 |
const struct condition_list *condition, |
struct ccs_domain_info *domain, |
487 |
const bool is_delete) |
const struct ccs_condition_list *condition, |
488 |
|
const bool is_delete) |
489 |
{ |
{ |
490 |
static DEFINE_MUTEX(lock); |
static DEFINE_MUTEX(lock); |
491 |
struct acl_info *ptr; |
struct ccs_acl_info *ptr; |
492 |
struct ip_network_acl_record *acl; |
struct ccs_ip_network_acl_record *acl; |
493 |
int error = -ENOMEM; |
int error = -ENOMEM; |
494 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
/* using host byte order to allow u32 comparison than memcmp().*/ |
495 |
const u32 min_ip = ntohl(*min_address); |
const u32 min_ip = ntohl(*min_address); |
500 |
return -EINVAL; |
return -EINVAL; |
501 |
if (record_type != IP_RECORD_TYPE_IPv6) |
if (record_type != IP_RECORD_TYPE_IPv6) |
502 |
goto not_ipv6; |
goto not_ipv6; |
503 |
saved_min_address = save_ipv6_address((struct in6_addr *) min_address); |
saved_min_address = ccs_save_ipv6_address((struct in6_addr *) |
504 |
saved_max_address = save_ipv6_address((struct in6_addr *) max_address); |
min_address); |
505 |
|
saved_max_address = ccs_save_ipv6_address((struct in6_addr *) |
506 |
|
max_address); |
507 |
if (!saved_min_address || !saved_max_address) |
if (!saved_min_address || !saved_max_address) |
508 |
return -ENOMEM; |
return -ENOMEM; |
509 |
not_ipv6: |
not_ipv6: |
515 |
continue; |
continue; |
516 |
if (ccs_get_condition_part(ptr) != condition) |
if (ccs_get_condition_part(ptr) != condition) |
517 |
continue; |
continue; |
518 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
519 |
if (acl->operation_type != operation || |
if (acl->operation_type != operation || |
520 |
acl->record_type != record_type || |
acl->record_type != record_type || |
521 |
acl->min_port != min_port || max_port != acl->max_port) |
acl->min_port != min_port || max_port != acl->max_port) |
561 |
continue; |
continue; |
562 |
if (ccs_get_condition_part(ptr) != condition) |
if (ccs_get_condition_part(ptr) != condition) |
563 |
continue; |
continue; |
564 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
565 |
if (acl->operation_type != operation || |
if (acl->operation_type != operation || |
566 |
acl->record_type != record_type || |
acl->record_type != record_type || |
567 |
acl->min_port != min_port || max_port != acl->max_port) |
acl->min_port != min_port || max_port != acl->max_port) |
587 |
} |
} |
588 |
|
|
589 |
/** |
/** |
590 |
* check_network_entry - Check permission for network operation. |
* ccs_check_network_entry - Check permission for network operation. |
591 |
* |
* |
592 |
* @is_ipv6: True if @address is an IPv6 address. |
* @is_ipv6: True if @address is an IPv6 address. |
593 |
* @operation: Type of operation. |
* @operation: Type of operation. |
596 |
* |
* |
597 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
598 |
*/ |
*/ |
599 |
static int check_network_entry(const bool is_ipv6, const u8 operation, |
static int ccs_check_network_entry(const bool is_ipv6, const u8 operation, |
600 |
const u32 *address, const u16 port) |
const u32 *address, const u16 port) |
601 |
{ |
{ |
602 |
struct ccs_request_info r; |
struct ccs_request_info r; |
603 |
struct acl_info *ptr; |
struct ccs_acl_info *ptr; |
604 |
const char *keyword = ccs_net2keyword(operation); |
const char *keyword = ccs_net2keyword(operation); |
605 |
bool is_enforce; |
bool is_enforce; |
606 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
/* using host byte order to allow u32 comparison than memcmp().*/ |
609 |
char buf[64]; |
char buf[64]; |
610 |
if (!ccs_can_sleep()) |
if (!ccs_can_sleep()) |
611 |
return 0; |
return 0; |
612 |
ccs_init_request_info(&r, NULL, CCS_TOMOYO_MAC_FOR_NETWORK); |
ccs_init_request_info(&r, NULL, CCS_MAC_FOR_NETWORK); |
613 |
is_enforce = (r.mode == 3); |
is_enforce = (r.mode == 3); |
614 |
if (!r.mode) |
if (!r.mode) |
615 |
return 0; |
return 0; |
616 |
retry: |
retry: |
617 |
list1_for_each_entry(ptr, &r.domain->acl_info_list, list) { |
list1_for_each_entry(ptr, &r.domain->acl_info_list, list) { |
618 |
struct ip_network_acl_record *acl; |
struct ccs_ip_network_acl_record *acl; |
619 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
620 |
continue; |
continue; |
621 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
622 |
if (acl->operation_type != operation || port < acl->min_port || |
if (acl->operation_type != operation || port < acl->min_port || |
623 |
acl->max_port < port || !ccs_check_condition(&r, ptr)) |
acl->max_port < port || !ccs_check_condition(&r, ptr)) |
624 |
continue; |
continue; |
625 |
if (acl->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
if (acl->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
626 |
if (!address_matches_to_group(is_ipv6, address, |
if (!ccs_address_matches_group(is_ipv6, address, |
627 |
acl->u.group)) |
acl->u.group)) |
628 |
continue; |
continue; |
629 |
} else if (acl->record_type == IP_RECORD_TYPE_IPv4) { |
} else if (acl->record_type == IP_RECORD_TYPE_IPv4) { |
630 |
if (is_ipv6 || |
if (is_ipv6 || |
646 |
(const struct in6_addr *) address); |
(const struct in6_addr *) address); |
647 |
else |
else |
648 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
649 |
audit_network_log(&r, keyword, buf, port, found); |
ccs_audit_network_log(&r, keyword, buf, port, found); |
650 |
if (found) |
if (found) |
651 |
return 0; |
return 0; |
652 |
if (ccs_verbose_mode(r.domain)) |
if (ccs_verbose_mode(r.domain)) |
661 |
goto retry; |
goto retry; |
662 |
return error; |
return error; |
663 |
} |
} |
664 |
if (r.mode == 1 && ccs_check_domain_quota(r.domain)) |
if (r.mode == 1 && ccs_domain_quota_ok(r.domain)) |
665 |
update_network_entry(operation, is_ipv6 ? |
ccs_update_network_entry(operation, is_ipv6 ? |
666 |
IP_RECORD_TYPE_IPv6 : IP_RECORD_TYPE_IPv4, |
IP_RECORD_TYPE_IPv6 : |
667 |
NULL, address, address, port, port, |
IP_RECORD_TYPE_IPv4, |
668 |
r.domain, NULL, 0); |
NULL, address, address, port, port, |
669 |
|
r.domain, ccs_handler_cond(), 0); |
670 |
return 0; |
return 0; |
671 |
} |
} |
672 |
|
|
673 |
/** |
/** |
674 |
* ccs_write_network_policy - Write "struct ip_network_acl_record" list. |
* ccs_write_network_policy - Write "struct ccs_ip_network_acl_record" list. |
675 |
* |
* |
676 |
* @data: String to parse. |
* @data: String to parse. |
677 |
* @domain: Pointer to "struct domain_info". |
* @domain: Pointer to "struct ccs_domain_info". |
678 |
* @condition: Pointer to "struct condition_list". May be NULL. |
* @condition: Pointer to "struct ccs_condition_list". May be NULL. |
679 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
680 |
* |
* |
681 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
682 |
*/ |
*/ |
683 |
int ccs_write_network_policy(char *data, struct domain_info *domain, |
int ccs_write_network_policy(char *data, struct ccs_domain_info *domain, |
684 |
const struct condition_list *condition, |
const struct ccs_condition_list *condition, |
685 |
const bool is_delete) |
const bool is_delete) |
686 |
{ |
{ |
687 |
u8 sock_type; |
u8 sock_type; |
689 |
u8 record_type; |
u8 record_type; |
690 |
u16 min_address[8]; |
u16 min_address[8]; |
691 |
u16 max_address[8]; |
u16 max_address[8]; |
692 |
struct address_group_entry *group = NULL; |
struct ccs_address_group_entry *group = NULL; |
693 |
u16 min_port; |
u16 min_port; |
694 |
u16 max_port; |
u16 max_port; |
695 |
u8 count; |
u8 count; |
742 |
if (!cp1) |
if (!cp1) |
743 |
goto out; |
goto out; |
744 |
*cp1++ = '\0'; |
*cp1++ = '\0'; |
745 |
switch (parse_ip_address(cp2, min_address, max_address)) { |
switch (ccs_parse_ip_address(cp2, min_address, max_address)) { |
746 |
case 2: |
case 2: |
747 |
record_type = IP_RECORD_TYPE_IPv6; |
record_type = IP_RECORD_TYPE_IPv6; |
748 |
break; |
break; |
752 |
default: |
default: |
753 |
if (*cp2 != '@') |
if (*cp2 != '@') |
754 |
goto out; |
goto out; |
755 |
group = find_or_assign_new_address_group(cp2 + 1); |
group = ccs_find_or_assign_new_address_group(cp2 + 1); |
756 |
if (!group) |
if (!group) |
757 |
return -ENOMEM; |
return -ENOMEM; |
758 |
record_type = IP_RECORD_TYPE_ADDRESS_GROUP; |
record_type = IP_RECORD_TYPE_ADDRESS_GROUP; |
765 |
goto out; |
goto out; |
766 |
if (count == 1) |
if (count == 1) |
767 |
max_port = min_port; |
max_port = min_port; |
768 |
return update_network_entry(operation, record_type, group, |
return ccs_update_network_entry(operation, record_type, group, |
769 |
(u32 *) min_address, (u32 *) max_address, |
(u32 *) min_address, |
770 |
min_port, max_port, domain, condition, |
(u32 *) max_address, |
771 |
is_delete); |
min_port, max_port, domain, condition, |
772 |
|
is_delete); |
773 |
out: |
out: |
774 |
return -EINVAL; |
return -EINVAL; |
775 |
} |
} |
783 |
* |
* |
784 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
785 |
*/ |
*/ |
786 |
int ccs_check_network_listen_acl(const _Bool is_ipv6, const u8 *address, |
static inline int ccs_check_network_listen_acl(const bool is_ipv6, |
787 |
const u16 port) |
const u8 *address, |
788 |
|
const u16 port) |
789 |
{ |
{ |
790 |
return check_network_entry(is_ipv6, NETWORK_ACL_TCP_LISTEN, |
return ccs_check_network_entry(is_ipv6, NETWORK_ACL_TCP_LISTEN, |
791 |
(const u32 *) address, ntohs(port)); |
(const u32 *) address, ntohs(port)); |
792 |
} |
} |
793 |
|
|
794 |
/** |
/** |
801 |
* |
* |
802 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
803 |
*/ |
*/ |
804 |
int ccs_check_network_connect_acl(const _Bool is_ipv6, const int sock_type, |
static inline int ccs_check_network_connect_acl(const bool is_ipv6, |
805 |
const u8 *address, const u16 port) |
const int sock_type, |
806 |
|
const u8 *address, |
807 |
|
const u16 port) |
808 |
{ |
{ |
809 |
u8 operation; |
u8 operation; |
810 |
switch (sock_type) { |
switch (sock_type) { |
817 |
default: |
default: |
818 |
operation = NETWORK_ACL_RAW_CONNECT; |
operation = NETWORK_ACL_RAW_CONNECT; |
819 |
} |
} |
820 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
return ccs_check_network_entry(is_ipv6, operation, |
821 |
ntohs(port)); |
(const u32 *) address, ntohs(port)); |
822 |
} |
} |
823 |
|
|
824 |
/** |
/** |
831 |
* |
* |
832 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
833 |
*/ |
*/ |
834 |
int ccs_check_network_bind_acl(const _Bool is_ipv6, const int sock_type, |
static int ccs_check_network_bind_acl(const bool is_ipv6, const int sock_type, |
835 |
const u8 *address, const u16 port) |
const u8 *address, const u16 port) |
836 |
{ |
{ |
837 |
u8 operation; |
u8 operation; |
838 |
switch (sock_type) { |
switch (sock_type) { |
845 |
default: |
default: |
846 |
operation = NETWORK_ACL_RAW_BIND; |
operation = NETWORK_ACL_RAW_BIND; |
847 |
} |
} |
848 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
return ccs_check_network_entry(is_ipv6, operation, |
849 |
ntohs(port)); |
(const u32 *) address, ntohs(port)); |
850 |
} |
} |
851 |
|
|
852 |
/** |
/** |
858 |
* |
* |
859 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
860 |
*/ |
*/ |
861 |
int ccs_check_network_accept_acl(const _Bool is_ipv6, const u8 *address, |
static inline int ccs_check_network_accept_acl(const bool is_ipv6, |
862 |
const u16 port) |
const u8 *address, |
863 |
|
const u16 port) |
864 |
{ |
{ |
865 |
int retval; |
int retval; |
866 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
867 |
retval = check_network_entry(is_ipv6, NETWORK_ACL_TCP_ACCEPT, |
retval = ccs_check_network_entry(is_ipv6, NETWORK_ACL_TCP_ACCEPT, |
868 |
(const u32 *) address, ntohs(port)); |
(const u32 *) address, ntohs(port)); |
869 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
870 |
return retval; |
return retval; |
871 |
} |
} |
872 |
|
|
880 |
* |
* |
881 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
882 |
*/ |
*/ |
883 |
int ccs_check_network_sendmsg_acl(const _Bool is_ipv6, const int sock_type, |
static inline int ccs_check_network_sendmsg_acl(const bool is_ipv6, |
884 |
const u8 *address, const u16 port) |
const int sock_type, |
885 |
|
const u8 *address, |
886 |
|
const u16 port) |
887 |
{ |
{ |
888 |
u8 operation; |
u8 operation; |
889 |
if (sock_type == SOCK_DGRAM) |
if (sock_type == SOCK_DGRAM) |
890 |
operation = NETWORK_ACL_UDP_CONNECT; |
operation = NETWORK_ACL_UDP_CONNECT; |
891 |
else |
else |
892 |
operation = NETWORK_ACL_RAW_CONNECT; |
operation = NETWORK_ACL_RAW_CONNECT; |
893 |
return check_network_entry(is_ipv6, operation, (const u32 *) address, |
return ccs_check_network_entry(is_ipv6, operation, |
894 |
ntohs(port)); |
(const u32 *) address, ntohs(port)); |
895 |
} |
} |
896 |
|
|
897 |
/** |
/** |
904 |
* |
* |
905 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
906 |
*/ |
*/ |
907 |
int ccs_check_network_recvmsg_acl(const _Bool is_ipv6, const int sock_type, |
static inline int ccs_check_network_recvmsg_acl(const bool is_ipv6, |
908 |
const u8 *address, const u16 port) |
const int sock_type, |
909 |
|
const u8 *address, |
910 |
|
const u16 port) |
911 |
{ |
{ |
912 |
int retval; |
int retval; |
913 |
const u8 operation |
const u8 operation |
914 |
= (sock_type == SOCK_DGRAM) ? |
= (sock_type == SOCK_DGRAM) ? |
915 |
NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT; |
NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT; |
916 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
917 |
retval = check_network_entry(is_ipv6, operation, (const u32 *) address, |
retval = ccs_check_network_entry(is_ipv6, operation, |
918 |
ntohs(port)); |
(const u32 *) address, ntohs(port)); |
919 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
920 |
return retval; |
return retval; |
921 |
} |
} |
922 |
|
|
923 |
|
#define MAX_SOCK_ADDR 128 /* net/socket.c */ |
924 |
|
|
925 |
|
/* Check permission for creating a socket. */ |
926 |
|
int ccs_socket_create_permission(int family, int type, int protocol) |
927 |
|
{ |
928 |
|
int error = 0; |
929 |
|
/* Nothing to do if I am a kernel service. */ |
930 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
931 |
|
return 0; |
932 |
|
if (family == PF_PACKET && !ccs_capable(CCS_USE_PACKET_SOCKET)) |
933 |
|
return -EPERM; |
934 |
|
if (family == PF_ROUTE && !ccs_capable(CCS_USE_ROUTE_SOCKET)) |
935 |
|
return -EPERM; |
936 |
|
if (family != PF_INET && family != PF_INET6) |
937 |
|
return 0; |
938 |
|
switch (type) { |
939 |
|
case SOCK_STREAM: |
940 |
|
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CREATE)) |
941 |
|
error = -EPERM; |
942 |
|
break; |
943 |
|
case SOCK_DGRAM: |
944 |
|
if (!ccs_capable(CCS_USE_INET_DGRAM_SOCKET)) |
945 |
|
error = -EPERM; |
946 |
|
break; |
947 |
|
case SOCK_RAW: |
948 |
|
if (!ccs_capable(CCS_USE_INET_RAW_SOCKET)) |
949 |
|
error = -EPERM; |
950 |
|
break; |
951 |
|
} |
952 |
|
return error; |
953 |
|
} |
954 |
|
|
955 |
|
/* Check permission for listening a TCP socket. */ |
956 |
|
int ccs_socket_listen_permission(struct socket *sock) |
957 |
|
{ |
958 |
|
int error = 0; |
959 |
|
char addr[MAX_SOCK_ADDR]; |
960 |
|
int addr_len; |
961 |
|
/* Nothing to do if I am a kernel service. */ |
962 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
963 |
|
return 0; |
964 |
|
if (sock->type != SOCK_STREAM) |
965 |
|
return 0; |
966 |
|
switch (sock->sk->sk_family) { |
967 |
|
case PF_INET: |
968 |
|
case PF_INET6: |
969 |
|
break; |
970 |
|
default: |
971 |
|
return 0; |
972 |
|
} |
973 |
|
if (!ccs_capable(CCS_INET_STREAM_SOCKET_LISTEN)) |
974 |
|
return -EPERM; |
975 |
|
if (sock->ops->getname(sock, (struct sockaddr *) addr, &addr_len, 0)) |
976 |
|
return -EPERM; |
977 |
|
switch (((struct sockaddr *) addr)->sa_family) { |
978 |
|
struct sockaddr_in6 *addr6; |
979 |
|
struct sockaddr_in *addr4; |
980 |
|
case AF_INET6: |
981 |
|
addr6 = (struct sockaddr_in6 *) addr; |
982 |
|
error = ccs_check_network_listen_acl(true, |
983 |
|
addr6->sin6_addr.s6_addr, |
984 |
|
addr6->sin6_port); |
985 |
|
break; |
986 |
|
case AF_INET: |
987 |
|
addr4 = (struct sockaddr_in *) addr; |
988 |
|
error = ccs_check_network_listen_acl(false, |
989 |
|
(u8 *) &addr4->sin_addr, |
990 |
|
addr4->sin_port); |
991 |
|
break; |
992 |
|
} |
993 |
|
return error; |
994 |
|
} |
995 |
|
|
996 |
|
/* Check permission for setting the remote IP address/port pair of a socket. */ |
997 |
|
int ccs_socket_connect_permission(struct socket *sock, struct sockaddr *addr, |
998 |
|
int addr_len) |
999 |
|
{ |
1000 |
|
int error = 0; |
1001 |
|
const unsigned int type = sock->type; |
1002 |
|
/* Nothing to do if I am a kernel service. */ |
1003 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1004 |
|
return 0; |
1005 |
|
switch (type) { |
1006 |
|
case SOCK_STREAM: |
1007 |
|
case SOCK_DGRAM: |
1008 |
|
case SOCK_RAW: |
1009 |
|
break; |
1010 |
|
default: |
1011 |
|
return 0; |
1012 |
|
} |
1013 |
|
switch (addr->sa_family) { |
1014 |
|
struct sockaddr_in6 *addr6; |
1015 |
|
struct sockaddr_in *addr4; |
1016 |
|
u16 port; |
1017 |
|
case AF_INET6: |
1018 |
|
if (addr_len < SIN6_LEN_RFC2133) |
1019 |
|
break; |
1020 |
|
addr6 = (struct sockaddr_in6 *) addr; |
1021 |
|
if (type != SOCK_RAW) |
1022 |
|
port = addr6->sin6_port; |
1023 |
|
else |
1024 |
|
port = htons(sock->sk->sk_protocol); |
1025 |
|
error = ccs_check_network_connect_acl(true, type, |
1026 |
|
addr6->sin6_addr.s6_addr, |
1027 |
|
port); |
1028 |
|
break; |
1029 |
|
case AF_INET: |
1030 |
|
if (addr_len < sizeof(struct sockaddr_in)) |
1031 |
|
break; |
1032 |
|
addr4 = (struct sockaddr_in *) addr; |
1033 |
|
if (type != SOCK_RAW) |
1034 |
|
port = addr4->sin_port; |
1035 |
|
else |
1036 |
|
port = htons(sock->sk->sk_protocol); |
1037 |
|
error = ccs_check_network_connect_acl(false, type, |
1038 |
|
(u8 *) &addr4->sin_addr, |
1039 |
|
port); |
1040 |
|
break; |
1041 |
|
} |
1042 |
|
if (type != SOCK_STREAM) |
1043 |
|
return error; |
1044 |
|
switch (sock->sk->sk_family) { |
1045 |
|
case PF_INET: |
1046 |
|
case PF_INET6: |
1047 |
|
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CONNECT)) |
1048 |
|
error = -EPERM; |
1049 |
|
break; |
1050 |
|
} |
1051 |
|
return error; |
1052 |
|
} |
1053 |
|
|
1054 |
|
/* Check permission for setting the local IP address/port pair of a socket. */ |
1055 |
|
int ccs_socket_bind_permission(struct socket *sock, struct sockaddr *addr, |
1056 |
|
int addr_len) |
1057 |
|
{ |
1058 |
|
int error = 0; |
1059 |
|
const unsigned int type = sock->type; |
1060 |
|
/* Nothing to do if I am a kernel service. */ |
1061 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1062 |
|
return 0; |
1063 |
|
switch (type) { |
1064 |
|
case SOCK_STREAM: |
1065 |
|
case SOCK_DGRAM: |
1066 |
|
case SOCK_RAW: |
1067 |
|
break; |
1068 |
|
default: |
1069 |
|
return 0; |
1070 |
|
} |
1071 |
|
switch (addr->sa_family) { |
1072 |
|
struct sockaddr_in6 *addr6; |
1073 |
|
struct sockaddr_in *addr4; |
1074 |
|
u16 port; |
1075 |
|
case AF_INET6: |
1076 |
|
if (addr_len < SIN6_LEN_RFC2133) |
1077 |
|
break; |
1078 |
|
addr6 = (struct sockaddr_in6 *) addr; |
1079 |
|
if (type != SOCK_RAW) |
1080 |
|
port = addr6->sin6_port; |
1081 |
|
else |
1082 |
|
port = htons(sock->sk->sk_protocol); |
1083 |
|
error = ccs_check_network_bind_acl(true, type, |
1084 |
|
addr6->sin6_addr.s6_addr, |
1085 |
|
port); |
1086 |
|
break; |
1087 |
|
case AF_INET: |
1088 |
|
if (addr_len < sizeof(struct sockaddr_in)) |
1089 |
|
break; |
1090 |
|
addr4 = (struct sockaddr_in *) addr; |
1091 |
|
if (type != SOCK_RAW) |
1092 |
|
port = addr4->sin_port; |
1093 |
|
else |
1094 |
|
port = htons(sock->sk->sk_protocol); |
1095 |
|
error = ccs_check_network_bind_acl(false, type, |
1096 |
|
(u8 *) &addr4->sin_addr, |
1097 |
|
port); |
1098 |
|
break; |
1099 |
|
} |
1100 |
|
return error; |
1101 |
|
} |
1102 |
|
|
1103 |
|
/* |
1104 |
|
* Check permission for accepting a TCP socket. |
1105 |
|
* |
1106 |
|
* Currently, the LSM hook for this purpose is not provided. |
1107 |
|
*/ |
1108 |
|
int ccs_socket_accept_permission(struct socket *sock, struct sockaddr *addr) |
1109 |
|
{ |
1110 |
|
int error = 0; |
1111 |
|
int addr_len; |
1112 |
|
/* Nothing to do if I am a kernel service. */ |
1113 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1114 |
|
return 0; |
1115 |
|
switch (sock->sk->sk_family) { |
1116 |
|
case PF_INET: |
1117 |
|
case PF_INET6: |
1118 |
|
break; |
1119 |
|
default: |
1120 |
|
return 0; |
1121 |
|
} |
1122 |
|
error = sock->ops->getname(sock, addr, &addr_len, 2); |
1123 |
|
if (error) |
1124 |
|
return error; |
1125 |
|
switch (addr->sa_family) { |
1126 |
|
struct sockaddr_in6 *addr6; |
1127 |
|
struct sockaddr_in *addr4; |
1128 |
|
case AF_INET6: |
1129 |
|
addr6 = (struct sockaddr_in6 *) addr; |
1130 |
|
error = ccs_check_network_accept_acl(true, |
1131 |
|
addr6->sin6_addr.s6_addr, |
1132 |
|
addr6->sin6_port); |
1133 |
|
break; |
1134 |
|
case AF_INET: |
1135 |
|
addr4 = (struct sockaddr_in *) addr; |
1136 |
|
error = ccs_check_network_accept_acl(false, |
1137 |
|
(u8 *) &addr4->sin_addr, |
1138 |
|
addr4->sin_port); |
1139 |
|
break; |
1140 |
|
} |
1141 |
|
return error; |
1142 |
|
} |
1143 |
|
|
1144 |
|
/* Check permission for sending a datagram via a UDP or RAW socket. */ |
1145 |
|
int ccs_socket_sendmsg_permission(struct socket *sock, struct sockaddr *addr, |
1146 |
|
int addr_len) |
1147 |
|
{ |
1148 |
|
int error = 0; |
1149 |
|
const int type = sock->type; |
1150 |
|
/* Nothing to do if I am a kernel service. */ |
1151 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1152 |
|
return 0; |
1153 |
|
if (!addr || (type != SOCK_DGRAM && type != SOCK_RAW)) |
1154 |
|
return 0; |
1155 |
|
switch (addr->sa_family) { |
1156 |
|
struct sockaddr_in6 *addr6; |
1157 |
|
struct sockaddr_in *addr4; |
1158 |
|
u16 port; |
1159 |
|
case AF_INET6: |
1160 |
|
if (addr_len < SIN6_LEN_RFC2133) |
1161 |
|
break; |
1162 |
|
addr6 = (struct sockaddr_in6 *) addr; |
1163 |
|
if (type == SOCK_DGRAM) |
1164 |
|
port = addr6->sin6_port; |
1165 |
|
else |
1166 |
|
port = htons(sock->sk->sk_protocol); |
1167 |
|
error = ccs_check_network_sendmsg_acl(true, type, |
1168 |
|
addr6->sin6_addr.s6_addr, |
1169 |
|
port); |
1170 |
|
break; |
1171 |
|
case AF_INET: |
1172 |
|
if (addr_len < sizeof(struct sockaddr_in)) |
1173 |
|
break; |
1174 |
|
addr4 = (struct sockaddr_in *) addr; |
1175 |
|
if (type == SOCK_DGRAM) |
1176 |
|
port = addr4->sin_port; |
1177 |
|
else |
1178 |
|
port = htons(sock->sk->sk_protocol); |
1179 |
|
error = ccs_check_network_sendmsg_acl(false, type, |
1180 |
|
(u8 *) &addr4->sin_addr, |
1181 |
|
port); |
1182 |
|
break; |
1183 |
|
} |
1184 |
|
return error; |
1185 |
|
} |
1186 |
|
|
1187 |
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) |
1188 |
|
#if !defined(RHEL_MAJOR) || RHEL_MAJOR != 5 |
1189 |
|
|
1190 |
|
static inline struct iphdr *ip_hdr(const struct sk_buff *skb) |
1191 |
|
{ |
1192 |
|
return skb->nh.iph; |
1193 |
|
} |
1194 |
|
|
1195 |
|
static inline struct udphdr *udp_hdr(const struct sk_buff *skb) |
1196 |
|
{ |
1197 |
|
return skb->h.uh; |
1198 |
|
} |
1199 |
|
|
1200 |
|
static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) |
1201 |
|
{ |
1202 |
|
return skb->nh.ipv6h; |
1203 |
|
} |
1204 |
|
|
1205 |
|
#endif |
1206 |
|
#endif |
1207 |
|
|
1208 |
|
/* |
1209 |
|
* Check permission for receiving a datagram via a UDP or RAW socket. |
1210 |
|
* |
1211 |
|
* Currently, the LSM hook for this purpose is not provided. |
1212 |
|
*/ |
1213 |
|
int ccs_socket_recv_datagram_permission(struct sock *sk, struct sk_buff *skb, |
1214 |
|
const unsigned int flags) |
1215 |
|
{ |
1216 |
|
int error = 0; |
1217 |
|
const unsigned int type = sk->sk_type; |
1218 |
|
/* Nothing to do if I didn't receive a datagram. */ |
1219 |
|
if (!skb) |
1220 |
|
return 0; |
1221 |
|
/* Nothing to do if I can't sleep. */ |
1222 |
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) |
1223 |
|
if (in_interrupt()) |
1224 |
|
return 0; |
1225 |
|
#else |
1226 |
|
if (in_atomic()) |
1227 |
|
return 0; |
1228 |
|
#endif |
1229 |
|
/* Nothing to do if I am a kernel service. */ |
1230 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1231 |
|
return 0; |
1232 |
|
if (type != SOCK_DGRAM && type != SOCK_RAW) |
1233 |
|
return 0; |
1234 |
|
|
1235 |
|
switch (sk->sk_family) { |
1236 |
|
struct in6_addr sin6; |
1237 |
|
struct in_addr sin4; |
1238 |
|
u16 port; |
1239 |
|
case PF_INET6: |
1240 |
|
if (type == SOCK_DGRAM) { /* UDP IPv6 */ |
1241 |
|
if (skb->protocol == htons(ETH_P_IP)) { |
1242 |
|
ipv6_addr_set(&sin6, 0, 0, htonl(0xffff), |
1243 |
|
ip_hdr(skb)->saddr); |
1244 |
|
} else { |
1245 |
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
1246 |
|
} |
1247 |
|
port = udp_hdr(skb)->source; |
1248 |
|
} else { /* RAW IPv6 */ |
1249 |
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
1250 |
|
port = htons(sk->sk_protocol); |
1251 |
|
} |
1252 |
|
error = ccs_check_network_recvmsg_acl(true, type, |
1253 |
|
(u8 *) &sin6, port); |
1254 |
|
break; |
1255 |
|
case PF_INET: |
1256 |
|
if (type == SOCK_DGRAM) { /* UDP IPv4 */ |
1257 |
|
sin4.s_addr = ip_hdr(skb)->saddr; |
1258 |
|
port = udp_hdr(skb)->source; |
1259 |
|
} else { /* RAW IPv4 */ |
1260 |
|
sin4.s_addr = ip_hdr(skb)->saddr; |
1261 |
|
port = htons(sk->sk_protocol); |
1262 |
|
} |
1263 |
|
error = ccs_check_network_recvmsg_acl(false, type, |
1264 |
|
(u8 *) &sin4, port); |
1265 |
|
break; |
1266 |
|
} |
1267 |
|
if (!error) |
1268 |
|
return 0; |
1269 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1270 |
|
lock_sock(sk); |
1271 |
|
#endif |
1272 |
|
/* |
1273 |
|
* Remove from queue if MSG_PEEK is used so that |
1274 |
|
* the head message from unwanted source in receive queue will not |
1275 |
|
* prevent the caller from picking up next message from wanted source |
1276 |
|
* when the caller is using MSG_PEEK flag for picking up. |
1277 |
|
*/ |
1278 |
|
if (flags & MSG_PEEK) { |
1279 |
|
unsigned long cpu_flags; |
1280 |
|
/***** CRITICAL SECTION START *****/ |
1281 |
|
spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags); |
1282 |
|
if (skb == skb_peek(&sk->sk_receive_queue)) { |
1283 |
|
__skb_unlink(skb, &sk->sk_receive_queue); |
1284 |
|
atomic_dec(&skb->users); |
1285 |
|
} |
1286 |
|
spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags); |
1287 |
|
/***** CRITICAL SECTION END *****/ |
1288 |
|
} |
1289 |
|
/* Drop reference count. */ |
1290 |
|
skb_free_datagram(sk, skb); |
1291 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1292 |
|
release_sock(sk); |
1293 |
|
#endif |
1294 |
|
/* Hope less harmful than -EPERM. */ |
1295 |
|
return -EAGAIN; |
1296 |
|
} |