| 1 |
/* |
/* |
| 2 |
* fs/tomoyo_network.c |
* security/ccsecurity/network.c |
| 3 |
* |
* |
| 4 |
* Implementation of the Domain-Based Mandatory Access Control. |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
| 5 |
* |
* |
| 6 |
* Copyright (C) 2005-2007 NTT DATA CORPORATION |
* Version: 1.7.0-pre 2009/08/08 |
|
* |
|
|
* Version: 1.5.3-pre 2007/12/03 |
|
| 7 |
* |
* |
| 8 |
* 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. |
| 9 |
* See README.ccs for ChangeLog. |
* See README.ccs for ChangeLog. |
| 10 |
* |
* |
| 11 |
*/ |
*/ |
|
/***** TOMOYO Linux start. *****/ |
|
| 12 |
|
|
| 13 |
#include <linux/ccs_common.h> |
#include <linux/net.h> |
| 14 |
#include <linux/tomoyo.h> |
#include <linux/inet.h> |
| 15 |
#include <linux/realpath.h> |
#include <linux/in.h> |
| 16 |
|
#include <linux/in6.h> |
| 17 |
#include <net/ip.h> |
#include <net/ip.h> |
| 18 |
|
#include <net/ipv6.h> |
| 19 |
|
#include <net/udp.h> |
| 20 |
|
#include "internal.h" |
| 21 |
|
|
| 22 |
|
/* Index numbers for Network Controls. */ |
| 23 |
|
enum ccs_network_acl_index { |
| 24 |
|
CCS_NETWORK_ACL_UDP_BIND, |
| 25 |
|
CCS_NETWORK_ACL_UDP_CONNECT, |
| 26 |
|
CCS_NETWORK_ACL_TCP_BIND, |
| 27 |
|
CCS_NETWORK_ACL_TCP_LISTEN, |
| 28 |
|
CCS_NETWORK_ACL_TCP_CONNECT, |
| 29 |
|
CCS_NETWORK_ACL_TCP_ACCEPT, |
| 30 |
|
CCS_NETWORK_ACL_RAW_BIND, |
| 31 |
|
CCS_NETWORK_ACL_RAW_CONNECT |
| 32 |
|
}; |
| 33 |
|
|
| 34 |
/************************* VARIABLES *************************/ |
/** |
| 35 |
|
* ccs_audit_network_log - Audit network log. |
| 36 |
extern struct mutex domain_acl_lock; |
* |
| 37 |
|
* @r: Pointer to "struct ccs_request_info". |
| 38 |
/************************* AUDIT FUNCTIONS *************************/ |
* @operation: The name of operation. |
| 39 |
|
* @address: An IPv4 or IPv6 address. |
| 40 |
static int AuditNetworkLog(const bool is_ipv6, const char *operation, const u32 *address, const u16 port, const bool is_granted) |
* @port: Port number. |
| 41 |
{ |
* @is_granted: True if this is a granted log. |
| 42 |
char *buf; |
* |
| 43 |
int len = 256; |
* Returns 0 on success, negative value otherwise. |
| 44 |
if (CanSaveAuditLog(is_granted) < 0) return -ENOMEM; |
*/ |
| 45 |
if ((buf = InitAuditLog(&len)) == NULL) return -ENOMEM; |
static int ccs_audit_network_log(struct ccs_request_info *r, |
| 46 |
snprintf(buf + strlen(buf), len - strlen(buf) - 1, KEYWORD_ALLOW_NETWORK "%s ", operation); |
const char *operation, const char *address, |
| 47 |
if (is_ipv6) { |
const u16 port, const bool is_granted) |
| 48 |
print_ipv6(buf + strlen(buf), len - strlen(buf), (const struct in6_addr *) address); |
{ |
| 49 |
} else { |
if (!is_granted && ccs_verbose_mode(r->domain)) |
| 50 |
u32 ip = *address; |
printk(KERN_WARNING "TOMOYO-%s: %s to %s %u denied for %s\n", |
| 51 |
snprintf(buf + strlen(buf), len - strlen(buf) - 1, "%u.%u.%u.%u", NIPQUAD(ip)); |
ccs_get_msg(r->mode == 3), operation, address, port, |
| 52 |
} |
ccs_get_last_name(r->domain)); |
| 53 |
snprintf(buf + strlen(buf), len - strlen(buf) - 1, " %u\n", port); |
return ccs_write_audit_log(is_granted, r, CCS_KEYWORD_ALLOW_NETWORK |
| 54 |
return WriteAuditLog(buf, is_granted); |
"%s %s %u\n", operation, address, port); |
|
} |
|
|
|
|
|
/************************* UTILITY FUNCTIONS *************************/ |
|
|
|
|
|
/* Keep the given IPv6 address on the RAM. The RAM is shared, so NEVER try to modify or kfree() the returned address. */ |
|
|
static const struct in6_addr *SaveIPv6Address(const struct in6_addr *addr) |
|
|
{ |
|
|
static const int block_size = 16; |
|
|
struct addr_list { |
|
|
struct in6_addr addr[block_size]; |
|
|
struct list1_head list; |
|
|
u32 in_use_count; |
|
|
}; |
|
|
static LIST1_HEAD(address_list); |
|
|
struct addr_list *ptr; |
|
|
static DEFINE_MUTEX(lock); |
|
|
int i = block_size; |
|
|
if (!addr) return NULL; |
|
|
mutex_lock(&lock); |
|
|
list1_for_each_entry(ptr, &address_list, list) { |
|
|
for (i = 0; i < ptr->in_use_count; i++) { |
|
|
if (memcmp(&ptr->addr[i], addr, sizeof(*addr)) == 0) goto ok; |
|
|
} |
|
|
if (i < block_size) break; |
|
|
} |
|
|
if (i == block_size) { |
|
|
ptr = alloc_element(sizeof(*ptr)); |
|
|
if (!ptr) goto ok; |
|
|
list1_add_tail_mb(&ptr->list, &address_list); |
|
|
i = 0; |
|
|
} |
|
|
ptr->addr[ptr->in_use_count++] = *addr; |
|
|
ok: |
|
|
mutex_unlock(&lock); |
|
|
return ptr ? &ptr->addr[i] : NULL; |
|
|
} |
|
|
|
|
|
/************************* ADDRESS GROUP HANDLER *************************/ |
|
|
|
|
|
static LIST1_HEAD(address_group_list); |
|
|
|
|
|
static int AddAddressGroupEntry(const char *group_name, const bool is_ipv6, const u16 *min_address, const u16 *max_address, const bool is_delete) |
|
|
{ |
|
|
static DEFINE_MUTEX(lock); |
|
|
struct address_group_entry *new_group, *group; |
|
|
struct address_group_member *new_member, *member; |
|
|
const struct path_info *saved_group_name; |
|
|
const struct in6_addr *saved_min_address = NULL, *saved_max_address = NULL; |
|
|
int error = -ENOMEM; |
|
|
bool found = 0; |
|
|
if (!IsCorrectPath(group_name, 0, 0, 0, __FUNCTION__) || !group_name[0]) return -EINVAL; |
|
|
if ((saved_group_name = SaveName(group_name)) == NULL) return -ENOMEM; |
|
|
if (is_ipv6) { |
|
|
if ((saved_min_address = SaveIPv6Address((struct in6_addr *) min_address)) == NULL |
|
|
|| (saved_max_address = SaveIPv6Address((struct in6_addr *) max_address)) == NULL) return -ENOMEM; |
|
|
} |
|
|
mutex_lock(&lock); |
|
|
list1_for_each_entry(group, &address_group_list, list) { |
|
|
if (saved_group_name != group->group_name) continue; |
|
|
list1_for_each_entry(member, &group->address_group_member_list, list) { |
|
|
if (member->is_ipv6 != is_ipv6) continue; |
|
|
if (is_ipv6) { |
|
|
if (member->min.ipv6 != saved_min_address || member->max.ipv6 != saved_max_address) continue; |
|
|
} else { |
|
|
if (member->min.ipv4 != * (u32 *) min_address || member->max.ipv4 != * (u32 *) max_address) continue; |
|
|
} |
|
|
member->is_deleted = is_delete; |
|
|
error = 0; |
|
|
goto out; |
|
|
} |
|
|
found = 1; |
|
|
break; |
|
|
} |
|
|
if (is_delete) { |
|
|
error = -ENOENT; |
|
|
goto out; |
|
|
} |
|
|
if (!found) { |
|
|
if ((new_group = alloc_element(sizeof(*new_group))) == NULL) goto out; |
|
|
INIT_LIST1_HEAD(&new_group->address_group_member_list); |
|
|
new_group->group_name = saved_group_name; |
|
|
list1_add_tail_mb(&new_group->list, &address_group_list); |
|
|
group = new_group; |
|
|
} |
|
|
if ((new_member = alloc_element(sizeof(*new_member))) == NULL) goto out; |
|
|
new_member->is_ipv6 = is_ipv6; |
|
|
if (is_ipv6) { |
|
|
new_member->min.ipv6 = saved_min_address; |
|
|
new_member->max.ipv6 = saved_max_address; |
|
|
} else { |
|
|
new_member->min.ipv4 = * (u32 *) min_address; |
|
|
new_member->max.ipv4 = * (u32 *) max_address; |
|
|
} |
|
|
list1_add_tail_mb(&new_member->list, &group->address_group_member_list); |
|
|
error = 0; |
|
|
out: |
|
|
mutex_unlock(&lock); |
|
|
return error; |
|
| 55 |
} |
} |
| 56 |
|
|
| 57 |
int AddAddressGroupPolicy(char *data, const bool is_delete) |
/** |
| 58 |
|
* ccs_parse_ip_address - Parse an IP address. |
| 59 |
|
* |
| 60 |
|
* @address: String to parse. |
| 61 |
|
* @min: Pointer to store min address. |
| 62 |
|
* @max: Pointer to store max address. |
| 63 |
|
* |
| 64 |
|
* Returns 2 if @address is an IPv6, 1 if @address is an IPv4, 0 otherwise. |
| 65 |
|
*/ |
| 66 |
|
int ccs_parse_ip_address(char *address, u16 *min, u16 *max) |
| 67 |
{ |
{ |
| 68 |
int count, is_ipv6; |
int count = sscanf(address, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx" |
| 69 |
u16 min_address[8], max_address[8]; |
"-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
| 70 |
char *cp = strchr(data, ' '); |
&min[0], &min[1], &min[2], &min[3], |
| 71 |
if (!cp) return -EINVAL; |
&min[4], &min[5], &min[6], &min[7], |
| 72 |
*cp++ = '\0'; |
&max[0], &max[1], &max[2], &max[3], |
| 73 |
if ((count = sscanf(cp, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
&max[4], &max[5], &max[6], &max[7]); |
| 74 |
&min_address[0], &min_address[1], &min_address[2], &min_address[3], |
if (count == 8 || count == 16) { |
| 75 |
&min_address[4], &min_address[5], &min_address[6], &min_address[7], |
u8 i; |
| 76 |
&max_address[0], &max_address[1], &max_address[2], &max_address[3], |
if (count == 8) |
| 77 |
&max_address[4], &max_address[5], &max_address[6], &max_address[7])) == 8 || count == 16) { |
memmove(max, min, sizeof(u16) * 8); |
|
int i; |
|
| 78 |
for (i = 0; i < 8; i++) { |
for (i = 0; i < 8; i++) { |
| 79 |
min_address[i] = htons(min_address[i]); |
min[i] = htons(min[i]); |
| 80 |
max_address[i] = htons(max_address[i]); |
max[i] = htons(max[i]); |
|
} |
|
|
if (count == 8) memmove(max_address, min_address, sizeof(min_address)); |
|
|
is_ipv6 = 1; |
|
|
} else if ((count = sscanf(cp, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
|
|
&min_address[0], &min_address[1], &min_address[2], &min_address[3], |
|
|
&max_address[0], &max_address[1], &max_address[2], &max_address[3])) == 4 || count == 8) { |
|
|
u32 ip = ((((u8) min_address[0]) << 24) + (((u8) min_address[1]) << 16) + (((u8) min_address[2]) << 8) + (u8) min_address[3]); |
|
|
* (u32 *) min_address = ip; |
|
|
if (count == 8) ip = ((((u8) max_address[0]) << 24) + (((u8) max_address[1]) << 16) + (((u8) max_address[2]) << 8) + (u8) max_address[3]); |
|
|
* (u32 *) max_address = ip; |
|
|
is_ipv6 = 0; |
|
|
} else { |
|
|
return -EINVAL; |
|
|
} |
|
|
return AddAddressGroupEntry(data, is_ipv6, min_address, max_address, is_delete); |
|
|
} |
|
|
|
|
|
static struct address_group_entry *FindOrAssignNewAddressGroup(const char *group_name) |
|
|
{ |
|
|
int i; |
|
|
struct address_group_entry *group; |
|
|
for (i = 0; i <= 1; i++) { |
|
|
list1_for_each_entry(group, &address_group_list, list) { |
|
|
if (strcmp(group_name, group->group_name->name) == 0) return group; |
|
|
} |
|
|
if (i == 0) { |
|
|
const u16 dummy[2] = { 0, 0 }; |
|
|
AddAddressGroupEntry(group_name, 0, dummy, dummy, 0); |
|
|
AddAddressGroupEntry(group_name, 0, dummy, dummy, 1); |
|
|
} |
|
|
} |
|
|
return NULL; |
|
|
} |
|
|
|
|
|
static int AddressMatchesToGroup(const bool is_ipv6, const u32 *address, const struct address_group_entry *group) |
|
|
{ |
|
|
struct address_group_member *member; |
|
|
const u32 ip = ntohl(*address); |
|
|
list1_for_each_entry(member, &group->address_group_member_list, list) { |
|
|
if (member->is_deleted) continue; |
|
|
if (member->is_ipv6) { |
|
|
if (is_ipv6 && memcmp(member->min.ipv6, address, 16) <= 0 && memcmp(address, member->max.ipv6, 16) <= 0) return 1; |
|
|
} else { |
|
|
if (!is_ipv6 && member->min.ipv4 <= ip && ip <= member->max.ipv4) return 1; |
|
| 81 |
} |
} |
| 82 |
|
return 2; |
| 83 |
} |
} |
| 84 |
return 0; |
count = sscanf(address, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
| 85 |
} |
&min[0], &min[1], &min[2], &min[3], |
| 86 |
|
&max[0], &max[1], &max[2], &max[3]); |
| 87 |
int ReadAddressGroupPolicy(struct io_buffer *head) |
if (count == 4 || count == 8) { |
| 88 |
{ |
u32 ip = htonl((((u8) min[0]) << 24) + (((u8) min[1]) << 16) |
| 89 |
struct list1_head *gpos; |
+ (((u8) min[2]) << 8) + (u8) min[3]); |
| 90 |
struct list1_head *mpos; |
memmove(min, &ip, sizeof(ip)); |
| 91 |
list1_for_each_cookie(gpos, head->read_var1, &address_group_list) { |
if (count == 8) |
| 92 |
struct address_group_entry *group; |
ip = htonl((((u8) max[0]) << 24) + (((u8) max[1]) << 16) |
| 93 |
group = list1_entry(gpos, struct address_group_entry, list); |
+ (((u8) max[2]) << 8) + (u8) max[3]); |
| 94 |
list1_for_each_cookie(mpos, head->read_var2, &group->address_group_member_list) { |
memmove(max, &ip, sizeof(ip)); |
| 95 |
char buf[128]; |
return 1; |
|
struct address_group_member *member; |
|
|
member = list1_entry(mpos, struct address_group_member, list); |
|
|
if (member->is_deleted) continue; |
|
|
if (member->is_ipv6) { |
|
|
const struct in6_addr *min_address = member->min.ipv6, *max_address = member->max.ipv6; |
|
|
print_ipv6(buf, sizeof(buf), min_address); |
|
|
if (min_address != max_address) { |
|
|
char *cp = strchr(buf, '\0'); |
|
|
*cp++ = '-'; |
|
|
print_ipv6(cp, sizeof(buf) - strlen(buf), max_address); |
|
|
} |
|
|
} else { |
|
|
const u32 min_address = member->min.ipv4, max_address = member->max.ipv4; |
|
|
memset(buf, 0, sizeof(buf)); |
|
|
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(min_address)); |
|
|
if (min_address != max_address) { |
|
|
const int len = strlen(buf); |
|
|
snprintf(buf + len, sizeof(buf) - 1 - len, "-%u.%u.%u.%u", HIPQUAD(max_address)); |
|
|
} |
|
|
} |
|
|
if (io_printf(head, KEYWORD_ADDRESS_GROUP "%s %s\n", group->group_name->name, buf)) return -ENOMEM; |
|
|
} |
|
| 96 |
} |
} |
| 97 |
return 0; |
return 0; |
| 98 |
} |
} |
| 99 |
|
|
|
/************************* NETWORK NETWORK ACL HANDLER *************************/ |
|
|
|
|
| 100 |
#if !defined(NIP6) |
#if !defined(NIP6) |
| 101 |
#define NIP6(addr) \ |
#define NIP6(addr) \ |
| 102 |
ntohs((addr).s6_addr16[0]), \ |
ntohs((addr).s6_addr16[0]), ntohs((addr).s6_addr16[1]), \ |
| 103 |
ntohs((addr).s6_addr16[1]), \ |
ntohs((addr).s6_addr16[2]), ntohs((addr).s6_addr16[3]), \ |
| 104 |
ntohs((addr).s6_addr16[2]), \ |
ntohs((addr).s6_addr16[4]), ntohs((addr).s6_addr16[5]), \ |
| 105 |
ntohs((addr).s6_addr16[3]), \ |
ntohs((addr).s6_addr16[6]), ntohs((addr).s6_addr16[7]) |
|
ntohs((addr).s6_addr16[4]), \ |
|
|
ntohs((addr).s6_addr16[5]), \ |
|
|
ntohs((addr).s6_addr16[6]), \ |
|
|
ntohs((addr).s6_addr16[7]) |
|
| 106 |
#endif |
#endif |
| 107 |
|
|
| 108 |
char *print_ipv6(char *buffer, const int buffer_len, const struct in6_addr *ip) |
/** |
| 109 |
|
* ccs_print_ipv6 - Print an IPv6 address. |
| 110 |
|
* |
| 111 |
|
* @buffer: Buffer to write to. |
| 112 |
|
* @buffer_len: Size of @buffer. |
| 113 |
|
* @ip: Pointer to "struct in6_addr". |
| 114 |
|
* |
| 115 |
|
* Returns nothing. |
| 116 |
|
*/ |
| 117 |
|
void ccs_print_ipv6(char *buffer, const int buffer_len, |
| 118 |
|
const struct in6_addr *ip) |
| 119 |
{ |
{ |
| 120 |
memset(buffer, 0, buffer_len); |
memset(buffer, 0, buffer_len); |
| 121 |
snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip)); |
snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip)); |
|
return buffer; |
|
| 122 |
} |
} |
| 123 |
|
|
| 124 |
const char *network2keyword(const unsigned int operation) |
/** |
| 125 |
|
* ccs_net2keyword - Convert network operation index to network operation name. |
| 126 |
|
* |
| 127 |
|
* @operation: Type of operation. |
| 128 |
|
* |
| 129 |
|
* Returns the name of operation. |
| 130 |
|
*/ |
| 131 |
|
const char *ccs_net2keyword(const u8 operation) |
| 132 |
{ |
{ |
| 133 |
const char *keyword = "unknown"; |
const char *keyword = "unknown"; |
| 134 |
switch (operation) { |
switch (operation) { |
| 135 |
case NETWORK_ACL_UDP_BIND: |
case CCS_NETWORK_ACL_UDP_BIND: |
| 136 |
keyword = "UDP bind"; |
keyword = "UDP bind"; |
| 137 |
break; |
break; |
| 138 |
case NETWORK_ACL_UDP_CONNECT: |
case CCS_NETWORK_ACL_UDP_CONNECT: |
| 139 |
keyword = "UDP connect"; |
keyword = "UDP connect"; |
| 140 |
break; |
break; |
| 141 |
case NETWORK_ACL_TCP_BIND: |
case CCS_NETWORK_ACL_TCP_BIND: |
| 142 |
keyword = "TCP bind"; |
keyword = "TCP bind"; |
| 143 |
break; |
break; |
| 144 |
case NETWORK_ACL_TCP_LISTEN: |
case CCS_NETWORK_ACL_TCP_LISTEN: |
| 145 |
keyword = "TCP listen"; |
keyword = "TCP listen"; |
| 146 |
break; |
break; |
| 147 |
case NETWORK_ACL_TCP_CONNECT: |
case CCS_NETWORK_ACL_TCP_CONNECT: |
| 148 |
keyword = "TCP connect"; |
keyword = "TCP connect"; |
| 149 |
break; |
break; |
| 150 |
case NETWORK_ACL_TCP_ACCEPT: |
case CCS_NETWORK_ACL_TCP_ACCEPT: |
| 151 |
keyword = "TCP accept"; |
keyword = "TCP accept"; |
| 152 |
break; |
break; |
| 153 |
case NETWORK_ACL_RAW_BIND: |
case CCS_NETWORK_ACL_RAW_BIND: |
| 154 |
keyword = "RAW bind"; |
keyword = "RAW bind"; |
| 155 |
break; |
break; |
| 156 |
case NETWORK_ACL_RAW_CONNECT: |
case CCS_NETWORK_ACL_RAW_CONNECT: |
| 157 |
keyword = "RAW connect"; |
keyword = "RAW connect"; |
| 158 |
break; |
break; |
| 159 |
} |
} |
| 160 |
return keyword; |
return keyword; |
| 161 |
} |
} |
| 162 |
|
|
| 163 |
static int AddNetworkEntry(const u8 operation, const u8 record_type, const struct address_group_entry *group, const u32 *min_address, const u32 *max_address, const u16 min_port, const u16 max_port, struct domain_info *domain, const struct condition_list *condition, const bool is_delete) |
/** |
| 164 |
|
* ccs_check_network_entry2 - Check permission for network operation. |
| 165 |
|
* |
| 166 |
|
* @is_ipv6: True if @address is an IPv6 address. |
| 167 |
|
* @operation: Type of operation. |
| 168 |
|
* @address: An IPv4 or IPv6 address. |
| 169 |
|
* @port: Port number. |
| 170 |
|
* |
| 171 |
|
* Returns 0 on success, negative value otherwise. |
| 172 |
|
* |
| 173 |
|
* Caller holds ccs_read_lock(). |
| 174 |
|
*/ |
| 175 |
|
static int ccs_check_network_entry2(const bool is_ipv6, const u8 operation, |
| 176 |
|
const u32 *address, const u16 port) |
| 177 |
{ |
{ |
| 178 |
struct acl_info *ptr; |
struct ccs_request_info r; |
| 179 |
struct ip_network_acl_record *acl; |
struct ccs_acl_info *ptr; |
| 180 |
int error = -ENOMEM; |
const char *keyword = ccs_net2keyword(operation); |
| 181 |
const u32 min_ip = ntohl(*min_address), max_ip = ntohl(*max_address); /* using host byte order to allow u32 comparison than memcmp().*/ |
bool is_enforce; |
| 182 |
const struct in6_addr *saved_min_address = NULL, *saved_max_address = NULL; |
/* using host byte order to allow u32 comparison than memcmp().*/ |
| 183 |
if (!domain) return -EINVAL; |
const u32 ip = ntohl(*address); |
| 184 |
if (record_type == IP_RECORD_TYPE_IPv6) { |
int error; |
| 185 |
if ((saved_min_address = SaveIPv6Address((struct in6_addr *) min_address)) == NULL |
char buf[64]; |
| 186 |
|| (saved_max_address = SaveIPv6Address((struct in6_addr *) max_address)) == NULL) return -ENOMEM; |
ccs_check_read_lock(); |
| 187 |
} |
if (!ccs_can_sleep() || |
| 188 |
mutex_lock(&domain_acl_lock); |
!ccs_init_request_info(&r, NULL, CCS_MAC_FOR_NETWORK)) |
| 189 |
if (!is_delete) { |
return 0; |
| 190 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
is_enforce = (r.mode == 3); |
| 191 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
retry: |
| 192 |
if (ptr->type == TYPE_IP_NETWORK_ACL && acl->operation_type == operation && acl->record_type == record_type && ptr->cond == condition && acl->min_port == min_port && max_port == acl->max_port) { |
error = -EPERM; |
| 193 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
list_for_each_entry_rcu(ptr, &r.domain->acl_info_list, list) { |
| 194 |
if (acl->u.group == group) { |
struct ccs_ip_network_acl_record *acl; |
| 195 |
ptr->is_deleted = 0; |
if (ptr->is_deleted || ptr->type != CCS_TYPE_IP_NETWORK_ACL) |
| 196 |
/* Found. Nothing to do. */ |
continue; |
| 197 |
error = 0; |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
| 198 |
goto out; |
if (acl->operation_type != operation) |
| 199 |
} |
continue; |
| 200 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
if (!ccs_compare_number_union(port, &acl->port) || |
| 201 |
if (acl->u.ipv4.min == min_ip && max_ip == acl->u.ipv4.max) { |
!ccs_check_condition(&r, ptr)) |
| 202 |
ptr->is_deleted = 0; |
continue; |
| 203 |
/* Found. Nothing to do. */ |
if (acl->record_type == CCS_IP_RECORD_TYPE_ADDRESS_GROUP) { |
| 204 |
error = 0; |
if (!ccs_address_matches_group(is_ipv6, address, |
| 205 |
goto out; |
acl->address.group)) |
| 206 |
} |
continue; |
| 207 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
} else if (acl->record_type == CCS_IP_RECORD_TYPE_IPv4) { |
| 208 |
if (acl->u.ipv6.min == saved_min_address && saved_max_address == acl->u.ipv6.max) { |
if (is_ipv6 || |
| 209 |
ptr->is_deleted = 0; |
ip < acl->address.ipv4.min || |
| 210 |
/* Found. Nothing to do. */ |
acl->address.ipv4.max < ip) |
| 211 |
error = 0; |
continue; |
|
goto out; |
|
|
} |
|
|
} |
|
|
} |
|
|
} |
|
|
/* Not found. Append it to the tail. */ |
|
|
if ((acl = alloc_element(sizeof(*acl))) == NULL) goto out; |
|
|
acl->head.type = TYPE_IP_NETWORK_ACL; |
|
|
acl->operation_type = operation; |
|
|
acl->record_type = record_type; |
|
|
acl->head.cond = condition; |
|
|
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
|
|
acl->u.group = group; |
|
|
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
|
|
acl->u.ipv4.min = min_ip; |
|
|
acl->u.ipv4.max = max_ip; |
|
| 212 |
} else { |
} else { |
| 213 |
acl->u.ipv6.min = saved_min_address; |
if (!is_ipv6 || |
| 214 |
acl->u.ipv6.max = saved_max_address; |
memcmp(acl->address.ipv6.min, address, 16) > 0 || |
| 215 |
} |
memcmp(address, acl->address.ipv6.max, 16) > 0) |
| 216 |
acl->min_port = min_port; |
continue; |
|
acl->max_port = max_port; |
|
|
error = AddDomainACL(domain, &acl->head); |
|
|
} else { |
|
|
error = -ENOENT; |
|
|
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
|
|
acl = container_of(ptr, struct ip_network_acl_record, head); |
|
|
if (ptr->type != TYPE_IP_NETWORK_ACL || ptr->is_deleted || acl->operation_type != operation || acl->record_type != record_type || ptr->cond != condition || acl->min_port != min_port || acl->max_port != max_port) continue; |
|
|
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
|
|
if (acl->u.group != group) continue; |
|
|
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
|
|
if (acl->u.ipv4.min != min_ip || max_ip != acl->u.ipv4.max) continue; |
|
|
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
|
|
if (acl->u.ipv6.min != saved_min_address || saved_max_address != acl->u.ipv6.max) continue; |
|
|
} |
|
|
error = DelDomainACL(ptr); |
|
|
break; |
|
| 217 |
} |
} |
| 218 |
|
r.cond = ptr->cond; |
| 219 |
|
error = 0; |
| 220 |
|
break; |
| 221 |
} |
} |
| 222 |
out: ; |
memset(buf, 0, sizeof(buf)); |
| 223 |
mutex_unlock(&domain_acl_lock); |
if (is_ipv6) |
| 224 |
|
ccs_print_ipv6(buf, sizeof(buf), |
| 225 |
|
(const struct in6_addr *) address); |
| 226 |
|
else |
| 227 |
|
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
| 228 |
|
ccs_audit_network_log(&r, keyword, buf, port, !error); |
| 229 |
|
if (error) |
| 230 |
|
error = ccs_check_supervisor(&r, CCS_KEYWORD_ALLOW_NETWORK |
| 231 |
|
"%s %s %u\n", keyword, buf, port); |
| 232 |
|
if (error == 1) |
| 233 |
|
goto retry; |
| 234 |
|
if (!is_enforce) |
| 235 |
|
error = 0; |
| 236 |
return error; |
return error; |
| 237 |
} |
} |
| 238 |
|
|
| 239 |
static int CheckNetworkEntry(const bool is_ipv6, const int operation, const u32 *address, const u16 port) |
/** |
| 240 |
|
* ccs_check_network_entry - Check permission for network operation. |
| 241 |
|
* |
| 242 |
|
* @is_ipv6: True if @address is an IPv6 address. |
| 243 |
|
* @operation: Type of operation. |
| 244 |
|
* @address: An IPv4 or IPv6 address. |
| 245 |
|
* @port: Port number. |
| 246 |
|
* |
| 247 |
|
* Returns 0 on success, negative value otherwise. |
| 248 |
|
*/ |
| 249 |
|
static int ccs_check_network_entry(const bool is_ipv6, const u8 operation, |
| 250 |
|
const u32 *address, const u16 port) |
| 251 |
{ |
{ |
| 252 |
struct domain_info * const domain = current->domain_info; |
const int idx = ccs_read_lock(); |
| 253 |
struct acl_info *ptr; |
const int error = ccs_check_network_entry2(is_ipv6, operation, |
| 254 |
const char *keyword = network2keyword(operation); |
address, port); |
| 255 |
const bool is_enforce = CheckCCSEnforce(CCS_TOMOYO_MAC_FOR_NETWORK); |
ccs_read_unlock(idx); |
| 256 |
const u32 ip = ntohl(*address); /* using host byte order to allow u32 comparison than memcmp().*/ |
return error; |
| 257 |
bool found = 0; |
} |
| 258 |
if (!CheckCCSFlags(CCS_TOMOYO_MAC_FOR_NETWORK)) return 0; |
|
| 259 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
/** |
| 260 |
struct ip_network_acl_record *acl; |
* ccs_write_network_policy - Write "struct ccs_ip_network_acl_record" list. |
| 261 |
acl = container_of(ptr, struct ip_network_acl_record, head); |
* |
| 262 |
if (ptr->type != TYPE_IP_NETWORK_ACL || ptr->is_deleted || acl->operation_type != operation || port < acl->min_port || acl->max_port < port || CheckCondition(ptr->cond, NULL)) continue; |
* @data: String to parse. |
| 263 |
if (acl->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
* @domain: Pointer to "struct ccs_domain_info". |
| 264 |
if (!AddressMatchesToGroup(is_ipv6, address, acl->u.group)) continue; |
* @condition: Pointer to "struct ccs_condition". May be NULL. |
| 265 |
} else if (acl->record_type == IP_RECORD_TYPE_IPv4) { |
* @is_delete: True if it is a delete request. |
| 266 |
if (is_ipv6 || ip < acl->u.ipv4.min || acl->u.ipv4.max < ip) continue; |
* |
| 267 |
} else { |
* Returns 0 on success, negative value otherwise. |
| 268 |
if (!is_ipv6 || memcmp(acl->u.ipv6.min, address, 16) > 0 || memcmp(address, acl->u.ipv6.max, 16) > 0) continue; |
*/ |
| 269 |
|
int ccs_write_network_policy(char *data, struct ccs_domain_info *domain, |
| 270 |
|
struct ccs_condition *condition, |
| 271 |
|
const bool is_delete) |
| 272 |
|
{ |
| 273 |
|
struct ccs_ip_network_acl_record *entry = NULL; |
| 274 |
|
struct ccs_acl_info *ptr; |
| 275 |
|
struct ccs_ip_network_acl_record e = { |
| 276 |
|
.head.type = CCS_TYPE_IP_NETWORK_ACL, |
| 277 |
|
.head.cond = condition, |
| 278 |
|
}; |
| 279 |
|
u16 min_address[8]; |
| 280 |
|
u16 max_address[8]; |
| 281 |
|
int error = is_delete ? -ENOENT : -ENOMEM; |
| 282 |
|
u8 sock_type; |
| 283 |
|
char *w[4]; |
| 284 |
|
if (!ccs_tokenize(data, w, sizeof(w)) || !w[3][0]) |
| 285 |
|
return -EINVAL; |
| 286 |
|
if (!strcmp(w[0], "TCP")) |
| 287 |
|
sock_type = SOCK_STREAM; |
| 288 |
|
else if (!strcmp(w[0], "UDP")) |
| 289 |
|
sock_type = SOCK_DGRAM; |
| 290 |
|
else if (!strcmp(w[0], "RAW")) |
| 291 |
|
sock_type = SOCK_RAW; |
| 292 |
|
else |
| 293 |
|
return -EINVAL; |
| 294 |
|
if (!strcmp(w[1], "bind")) |
| 295 |
|
switch (sock_type) { |
| 296 |
|
case SOCK_STREAM: |
| 297 |
|
e.operation_type = CCS_NETWORK_ACL_TCP_BIND; |
| 298 |
|
break; |
| 299 |
|
case SOCK_DGRAM: |
| 300 |
|
e.operation_type = CCS_NETWORK_ACL_UDP_BIND; |
| 301 |
|
break; |
| 302 |
|
default: |
| 303 |
|
e.operation_type = CCS_NETWORK_ACL_RAW_BIND; |
| 304 |
|
break; |
| 305 |
} |
} |
| 306 |
found = 1; |
else if (!strcmp(w[1], "connect")) |
| 307 |
|
switch (sock_type) { |
| 308 |
|
case SOCK_STREAM: |
| 309 |
|
e.operation_type = CCS_NETWORK_ACL_TCP_CONNECT; |
| 310 |
|
break; |
| 311 |
|
case SOCK_DGRAM: |
| 312 |
|
e.operation_type = CCS_NETWORK_ACL_UDP_CONNECT; |
| 313 |
|
break; |
| 314 |
|
default: |
| 315 |
|
e.operation_type = CCS_NETWORK_ACL_RAW_CONNECT; |
| 316 |
|
break; |
| 317 |
|
} |
| 318 |
|
else if (sock_type == SOCK_STREAM && !strcmp(w[1], "listen")) |
| 319 |
|
e.operation_type = CCS_NETWORK_ACL_TCP_LISTEN; |
| 320 |
|
else if (sock_type == SOCK_STREAM && !strcmp(w[1], "accept")) |
| 321 |
|
e.operation_type = CCS_NETWORK_ACL_TCP_ACCEPT; |
| 322 |
|
else |
| 323 |
|
return -EINVAL; |
| 324 |
|
switch (ccs_parse_ip_address(w[2], min_address, max_address)) { |
| 325 |
|
case 2: |
| 326 |
|
e.record_type = CCS_IP_RECORD_TYPE_IPv6; |
| 327 |
|
e.address.ipv6.min = ccs_get_ipv6_address((struct in6_addr *) |
| 328 |
|
min_address); |
| 329 |
|
e.address.ipv6.max = ccs_get_ipv6_address((struct in6_addr *) |
| 330 |
|
max_address); |
| 331 |
|
if (!e.address.ipv6.min || !e.address.ipv6.max) |
| 332 |
|
goto out; |
| 333 |
|
break; |
| 334 |
|
case 1: |
| 335 |
|
e.record_type = CCS_IP_RECORD_TYPE_IPv4; |
| 336 |
|
/* use host byte order to allow u32 comparison.*/ |
| 337 |
|
e.address.ipv4.min = ntohl(* (u32 *) min_address); |
| 338 |
|
e.address.ipv4.max = ntohl(* (u32 *) max_address); |
| 339 |
|
break; |
| 340 |
|
default: |
| 341 |
|
if (w[2][0] != '@') |
| 342 |
|
return -EINVAL; |
| 343 |
|
e.record_type = CCS_IP_RECORD_TYPE_ADDRESS_GROUP; |
| 344 |
|
e.address.group = ccs_get_address_group(w[2] + 1); |
| 345 |
|
if (!e.address.group) |
| 346 |
|
return -ENOMEM; |
| 347 |
break; |
break; |
|
|
|
| 348 |
} |
} |
| 349 |
AuditNetworkLog(is_ipv6, keyword, address, port, found); |
if (!ccs_parse_number_union(w[3], &e.port)) |
| 350 |
if (found) return 0; |
goto out; |
| 351 |
if (TomoyoVerboseMode()) { |
if (!is_delete) |
| 352 |
if (is_ipv6) { |
entry = kmalloc(sizeof(e), GFP_KERNEL); |
| 353 |
char buf[64]; |
mutex_lock(&ccs_policy_lock); |
| 354 |
print_ipv6(buf, sizeof(buf), (const struct in6_addr *) address); |
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
| 355 |
printk("TOMOYO-%s: %s to %s %u denied for %s\n", GetMSG(is_enforce), keyword, buf, port, GetLastName(domain)); |
struct ccs_ip_network_acl_record *acl = |
| 356 |
} else { |
container_of(ptr, struct ccs_ip_network_acl_record, |
| 357 |
printk("TOMOYO-%s: %s to %u.%u.%u.%u %u denied for %s\n", GetMSG(is_enforce), keyword, HIPQUAD(ip), port, GetLastName(domain)); |
head); |
| 358 |
} |
if (ptr->type != CCS_TYPE_IP_NETWORK_ACL || |
| 359 |
|
ptr->cond != condition || |
| 360 |
|
ccs_memcmp(acl, &e, offsetof(typeof(e), operation_type), |
| 361 |
|
sizeof(e))) |
| 362 |
|
continue; |
| 363 |
|
ptr->is_deleted = is_delete; |
| 364 |
|
error = 0; |
| 365 |
|
break; |
| 366 |
} |
} |
| 367 |
AuditNetworkLog(is_ipv6, keyword, address, port, 0); |
if (!is_delete && error && ccs_commit_ok(entry, &e, sizeof(e))) { |
| 368 |
if (is_enforce) { |
ccs_add_domain_acl(domain, &entry->head); |
| 369 |
if (is_ipv6) { |
entry = NULL; |
| 370 |
char buf[64]; |
error = 0; |
|
print_ipv6(buf, sizeof(buf), (const struct in6_addr *) address); |
|
|
return CheckSupervisor("%s\n" KEYWORD_ALLOW_NETWORK "%s %s %u\n", domain->domainname->name, keyword, buf, port); |
|
|
} |
|
|
return CheckSupervisor("%s\n" KEYWORD_ALLOW_NETWORK "%s %u.%u.%u.%u %u\n", domain->domainname->name, keyword, HIPQUAD(ip), port); |
|
| 371 |
} |
} |
| 372 |
if (CheckCCSAccept(CCS_TOMOYO_MAC_FOR_NETWORK, domain)) AddNetworkEntry(operation, is_ipv6 ? IP_RECORD_TYPE_IPv6 : IP_RECORD_TYPE_IPv4, NULL, address, address, port, port, domain, NULL, 0); |
mutex_unlock(&ccs_policy_lock); |
| 373 |
return 0; |
out: |
| 374 |
|
if (w[2][0] == '@') |
| 375 |
|
ccs_put_address_group(e.address.group); |
| 376 |
|
else if (e.record_type == CCS_IP_RECORD_TYPE_IPv6) { |
| 377 |
|
ccs_put_ipv6_address(e.address.ipv6.min); |
| 378 |
|
ccs_put_ipv6_address(e.address.ipv6.max); |
| 379 |
|
} |
| 380 |
|
ccs_put_number_union(&e.port); |
| 381 |
|
kfree(entry); |
| 382 |
|
return error; |
| 383 |
} |
} |
| 384 |
|
|
| 385 |
int AddNetworkPolicy(char *data, struct domain_info *domain, const struct condition_list *condition, const bool is_delete) |
/** |
| 386 |
|
* ccs_check_network_listen_acl - Check permission for listen() operation. |
| 387 |
|
* |
| 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 |
|
static inline int ccs_check_network_listen_acl(const bool is_ipv6, |
| 395 |
|
const u8 *address, |
| 396 |
|
const u16 port) |
| 397 |
{ |
{ |
| 398 |
u8 sock_type, operation, record_type; |
return ccs_check_network_entry(is_ipv6, CCS_NETWORK_ACL_TCP_LISTEN, |
| 399 |
u16 min_address[8], max_address[8]; |
(const u32 *) address, ntohs(port)); |
| 400 |
struct address_group_entry *group = NULL; |
} |
| 401 |
u16 min_port, max_port; |
|
| 402 |
int count; |
/** |
| 403 |
char *cp1 = NULL, *cp2 = NULL; |
* ccs_check_network_connect_acl - Check permission for connect() operation. |
| 404 |
if ((cp1 = strchr(data, ' ')) == NULL) goto out; cp1++; |
* |
| 405 |
if (strncmp(data, "TCP ", 4) == 0) sock_type = SOCK_STREAM; |
* @is_ipv6: True if @address is an IPv6 address. |
| 406 |
else if (strncmp(data, "UDP ", 4) == 0) sock_type = SOCK_DGRAM; |
* @sock_type: Type of socket. (TCP or UDP or RAW) |
| 407 |
else if (strncmp(data, "RAW ", 4) == 0) sock_type = SOCK_RAW; |
* @address: An IPv4 or IPv6 address. |
| 408 |
else goto out; |
* @port: Port number. |
| 409 |
if ((cp2 = strchr(cp1, ' ')) == NULL) goto out; cp2++; |
* |
| 410 |
if (strncmp(cp1, "bind ", 5) == 0) { |
* Returns 0 on success, negative value otherwise. |
| 411 |
operation = (sock_type == SOCK_STREAM) ? NETWORK_ACL_TCP_BIND : (sock_type == SOCK_DGRAM) ? NETWORK_ACL_UDP_BIND : NETWORK_ACL_RAW_BIND; |
*/ |
| 412 |
} else if (strncmp(cp1, "connect ", 8) == 0) { |
static inline int ccs_check_network_connect_acl(const bool is_ipv6, |
| 413 |
operation = (sock_type == SOCK_STREAM) ? NETWORK_ACL_TCP_CONNECT : (sock_type == SOCK_DGRAM) ? NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT; |
const int sock_type, |
| 414 |
} else if (sock_type == SOCK_STREAM && strncmp(cp1, "listen ", 7) == 0) { |
const u8 *address, |
| 415 |
operation = NETWORK_ACL_TCP_LISTEN; |
const u16 port) |
| 416 |
} else if (sock_type == SOCK_STREAM && strncmp(cp1, "accept ", 7) == 0) { |
{ |
| 417 |
operation = NETWORK_ACL_TCP_ACCEPT; |
u8 operation; |
| 418 |
} else { |
switch (sock_type) { |
| 419 |
goto out; |
case SOCK_STREAM: |
| 420 |
} |
operation = CCS_NETWORK_ACL_TCP_CONNECT; |
| 421 |
if ((cp1 = strchr(cp2, ' ')) == NULL) goto out; *cp1++ = '\0'; |
break; |
| 422 |
if ((count = sscanf(cp2, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
case SOCK_DGRAM: |
| 423 |
&min_address[0], &min_address[1], &min_address[2], &min_address[3], |
operation = CCS_NETWORK_ACL_UDP_CONNECT; |
| 424 |
&min_address[4], &min_address[5], &min_address[6], &min_address[7], |
break; |
| 425 |
&max_address[0], &max_address[1], &max_address[2], &max_address[3], |
default: |
| 426 |
&max_address[4], &max_address[5], &max_address[6], &max_address[7])) == 8 || count == 16) { |
operation = CCS_NETWORK_ACL_RAW_CONNECT; |
|
int i; |
|
|
for (i = 0; i < 8; i++) { |
|
|
min_address[i] = htons(min_address[i]); |
|
|
max_address[i] = htons(max_address[i]); |
|
|
} |
|
|
if (count == 8) memmove(max_address, min_address, sizeof(min_address)); |
|
|
record_type = IP_RECORD_TYPE_IPv6; |
|
|
} else if ((count = sscanf(cp2, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
|
|
&min_address[0], &min_address[1], &min_address[2], &min_address[3], |
|
|
&max_address[0], &max_address[1], &max_address[2], &max_address[3])) == 4 || count == 8) { |
|
|
u32 ip = htonl((((u8) min_address[0]) << 24) + (((u8) min_address[1]) << 16) + (((u8) min_address[2]) << 8) + (u8) min_address[3]); |
|
|
* (u32 *) min_address = ip; |
|
|
if (count == 8) ip = htonl((((u8) max_address[0]) << 24) + (((u8) max_address[1]) << 16) + (((u8) max_address[2]) << 8) + (u8) max_address[3]); |
|
|
* (u32 *) max_address = ip; |
|
|
record_type = IP_RECORD_TYPE_IPv4; |
|
|
} else if (*cp2 == '@') { |
|
|
if ((group = FindOrAssignNewAddressGroup(cp2 + 1)) == NULL) return -ENOMEM; |
|
|
record_type = IP_RECORD_TYPE_ADDRESS_GROUP; |
|
|
} else { |
|
|
goto out; |
|
|
} |
|
|
if (strchr(cp1, ' ')) goto out; |
|
|
if ((count = sscanf(cp1, "%hu-%hu", &min_port, &max_port)) == 1 || count == 2) { |
|
|
if (count == 1) max_port = min_port; |
|
|
return AddNetworkEntry(operation, record_type, group, (u32 *) min_address, (u32 *) max_address, min_port, max_port, domain, condition, is_delete); |
|
| 427 |
} |
} |
| 428 |
out: ; |
return ccs_check_network_entry(is_ipv6, operation, |
| 429 |
return -EINVAL; |
(const u32 *) address, ntohs(port)); |
| 430 |
} |
} |
| 431 |
|
|
| 432 |
int CheckNetworkListenACL(const _Bool is_ipv6, const u8 *address, const u16 port) |
/** |
| 433 |
|
* ccs_check_network_bind_acl - Check permission for bind() operation. |
| 434 |
|
* |
| 435 |
|
* @is_ipv6: True if @address is an IPv6 address. |
| 436 |
|
* @sock_type: Type of socket. (TCP or UDP or RAW) |
| 437 |
|
* @address: An IPv4 or IPv6 address. |
| 438 |
|
* @port: Port number. |
| 439 |
|
* |
| 440 |
|
* Returns 0 on success, negative value otherwise. |
| 441 |
|
*/ |
| 442 |
|
static int ccs_check_network_bind_acl(const bool is_ipv6, const int sock_type, |
| 443 |
|
const u8 *address, const u16 port) |
| 444 |
{ |
{ |
| 445 |
return CheckNetworkEntry(is_ipv6, NETWORK_ACL_TCP_LISTEN, (const u32 *) address, ntohs(port)); |
u8 operation; |
| 446 |
|
switch (sock_type) { |
| 447 |
|
case SOCK_STREAM: |
| 448 |
|
operation = CCS_NETWORK_ACL_TCP_BIND; |
| 449 |
|
break; |
| 450 |
|
case SOCK_DGRAM: |
| 451 |
|
operation = CCS_NETWORK_ACL_UDP_BIND; |
| 452 |
|
break; |
| 453 |
|
default: |
| 454 |
|
operation = CCS_NETWORK_ACL_RAW_BIND; |
| 455 |
|
} |
| 456 |
|
return ccs_check_network_entry(is_ipv6, operation, |
| 457 |
|
(const u32 *) address, ntohs(port)); |
| 458 |
} |
} |
|
EXPORT_SYMBOL(CheckNetworkListenACL); |
|
| 459 |
|
|
| 460 |
int CheckNetworkConnectACL(const _Bool is_ipv6, const int sock_type, const u8 *address, const u16 port) |
/** |
| 461 |
|
* ccs_check_network_accept_acl - Check permission for accept() operation. |
| 462 |
|
* |
| 463 |
|
* @is_ipv6: True if @address is an IPv6 address. |
| 464 |
|
* @address: An IPv4 or IPv6 address. |
| 465 |
|
* @port: Port number. |
| 466 |
|
* |
| 467 |
|
* Returns 0 on success, negative value otherwise. |
| 468 |
|
*/ |
| 469 |
|
static inline int ccs_check_network_accept_acl(const bool is_ipv6, |
| 470 |
|
const u8 *address, |
| 471 |
|
const u16 port) |
| 472 |
{ |
{ |
| 473 |
return CheckNetworkEntry(is_ipv6, sock_type == SOCK_STREAM ? NETWORK_ACL_TCP_CONNECT : (sock_type == SOCK_DGRAM ? NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT), (const u32 *) address, ntohs(port)); |
int retval; |
| 474 |
|
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 475 |
|
retval = ccs_check_network_entry(is_ipv6, CCS_NETWORK_ACL_TCP_ACCEPT, |
| 476 |
|
(const u32 *) address, ntohs(port)); |
| 477 |
|
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 478 |
|
return retval; |
| 479 |
} |
} |
|
EXPORT_SYMBOL(CheckNetworkConnectACL); |
|
| 480 |
|
|
| 481 |
int CheckNetworkBindACL(const _Bool is_ipv6, const int sock_type, const u8 *address, const u16 port) |
/** |
| 482 |
{ |
* ccs_check_network_sendmsg_acl - Check permission for sendmsg() operation. |
| 483 |
return CheckNetworkEntry(is_ipv6, sock_type == SOCK_STREAM ? NETWORK_ACL_TCP_BIND : (sock_type == SOCK_DGRAM ? NETWORK_ACL_UDP_BIND : NETWORK_ACL_RAW_BIND), (const u32 *) address, ntohs(port)); |
* |
| 484 |
|
* @is_ipv6: True if @address is an IPv6 address. |
| 485 |
|
* @sock_type: Type of socket. (UDP or RAW) |
| 486 |
|
* @address: An IPv4 or IPv6 address. |
| 487 |
|
* @port: Port number. |
| 488 |
|
* |
| 489 |
|
* Returns 0 on success, negative value otherwise. |
| 490 |
|
*/ |
| 491 |
|
static inline int ccs_check_network_sendmsg_acl(const bool is_ipv6, |
| 492 |
|
const int sock_type, |
| 493 |
|
const u8 *address, |
| 494 |
|
const u16 port) |
| 495 |
|
{ |
| 496 |
|
u8 operation; |
| 497 |
|
if (sock_type == SOCK_DGRAM) |
| 498 |
|
operation = CCS_NETWORK_ACL_UDP_CONNECT; |
| 499 |
|
else |
| 500 |
|
operation = CCS_NETWORK_ACL_RAW_CONNECT; |
| 501 |
|
return ccs_check_network_entry(is_ipv6, operation, |
| 502 |
|
(const u32 *) address, ntohs(port)); |
| 503 |
} |
} |
|
EXPORT_SYMBOL(CheckNetworkBindACL); |
|
| 504 |
|
|
| 505 |
int CheckNetworkAcceptACL(const _Bool is_ipv6, const u8 *address, const u16 port) |
/** |
| 506 |
|
* ccs_check_network_recvmsg_acl - Check permission for recvmsg() operation. |
| 507 |
|
* |
| 508 |
|
* @is_ipv6: True if @address is an IPv6 address. |
| 509 |
|
* @sock_type: Type of socket. (UDP or RAW) |
| 510 |
|
* @address: An IPv4 or IPv6 address. |
| 511 |
|
* @port: Port number. |
| 512 |
|
* |
| 513 |
|
* Returns 0 on success, negative value otherwise. |
| 514 |
|
*/ |
| 515 |
|
static inline int ccs_check_network_recvmsg_acl(const bool is_ipv6, |
| 516 |
|
const int sock_type, |
| 517 |
|
const u8 *address, |
| 518 |
|
const u16 port) |
| 519 |
{ |
{ |
| 520 |
int retval; |
int retval; |
| 521 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
const u8 operation |
| 522 |
retval = CheckNetworkEntry(is_ipv6, NETWORK_ACL_TCP_ACCEPT, (const u32 *) address, ntohs(port)); |
= (sock_type == SOCK_DGRAM) ? |
| 523 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
CCS_NETWORK_ACL_UDP_CONNECT : CCS_NETWORK_ACL_RAW_CONNECT; |
| 524 |
|
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 525 |
|
retval = ccs_check_network_entry(is_ipv6, operation, |
| 526 |
|
(const u32 *) address, ntohs(port)); |
| 527 |
|
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 528 |
return retval; |
return retval; |
| 529 |
} |
} |
|
EXPORT_SYMBOL(CheckNetworkAcceptACL); |
|
| 530 |
|
|
| 531 |
int CheckNetworkSendMsgACL(const _Bool is_ipv6, const int sock_type, const u8 *address, const u16 port) |
#define MAX_SOCK_ADDR 128 /* net/socket.c */ |
| 532 |
|
|
| 533 |
|
/* Check permission for creating a socket. */ |
| 534 |
|
int ccs_socket_create_permission(int family, int type, int protocol) |
| 535 |
{ |
{ |
| 536 |
return CheckNetworkEntry(is_ipv6, sock_type == SOCK_DGRAM ? NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT, (const u32 *) address, ntohs(port)); |
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 |
|
if (family == PF_PACKET && !ccs_capable(CCS_USE_PACKET_SOCKET)) |
| 541 |
|
return -EPERM; |
| 542 |
|
if (family == PF_ROUTE && !ccs_capable(CCS_USE_ROUTE_SOCKET)) |
| 543 |
|
return -EPERM; |
| 544 |
|
if (family != PF_INET && family != PF_INET6) |
| 545 |
|
return 0; |
| 546 |
|
switch (type) { |
| 547 |
|
case SOCK_STREAM: |
| 548 |
|
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CREATE)) |
| 549 |
|
error = -EPERM; |
| 550 |
|
break; |
| 551 |
|
case SOCK_DGRAM: |
| 552 |
|
if (!ccs_capable(CCS_USE_INET_DGRAM_SOCKET)) |
| 553 |
|
error = -EPERM; |
| 554 |
|
break; |
| 555 |
|
case SOCK_RAW: |
| 556 |
|
if (!ccs_capable(CCS_USE_INET_RAW_SOCKET)) |
| 557 |
|
error = -EPERM; |
| 558 |
|
break; |
| 559 |
|
} |
| 560 |
|
return error; |
| 561 |
} |
} |
|
EXPORT_SYMBOL(CheckNetworkSendMsgACL); |
|
| 562 |
|
|
| 563 |
int CheckNetworkRecvMsgACL(const _Bool is_ipv6, const int sock_type, const u8 *address, const u16 port) |
/* Check permission for listening a TCP socket. */ |
| 564 |
|
int ccs_socket_listen_permission(struct socket *sock) |
| 565 |
{ |
{ |
| 566 |
int retval; |
int error = 0; |
| 567 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
char addr[MAX_SOCK_ADDR]; |
| 568 |
retval = CheckNetworkEntry(is_ipv6, sock_type == SOCK_DGRAM ? NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT, (const u32 *) address, ntohs(port)); |
int addr_len; |
| 569 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
/* Nothing to do if I am a kernel service. */ |
| 570 |
return retval; |
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 |
|
if (!ccs_capable(CCS_INET_STREAM_SOCKET_LISTEN)) |
| 582 |
|
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 |
|
error = ccs_check_network_listen_acl(true, |
| 591 |
|
addr6->sin6_addr.s6_addr, |
| 592 |
|
addr6->sin6_port); |
| 593 |
|
break; |
| 594 |
|
case AF_INET: |
| 595 |
|
addr4 = (struct sockaddr_in *) addr; |
| 596 |
|
error = ccs_check_network_listen_acl(false, |
| 597 |
|
(u8 *) &addr4->sin_addr, |
| 598 |
|
addr4->sin_port); |
| 599 |
|
break; |
| 600 |
|
} |
| 601 |
|
return error; |
| 602 |
|
} |
| 603 |
|
|
| 604 |
|
/* Check permission for setting the remote IP address/port pair of a socket. */ |
| 605 |
|
int ccs_socket_connect_permission(struct socket *sock, struct sockaddr *addr, |
| 606 |
|
int addr_len) |
| 607 |
|
{ |
| 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 |
|
error = ccs_check_network_connect_acl(true, type, |
| 634 |
|
addr6->sin6_addr.s6_addr, |
| 635 |
|
port); |
| 636 |
|
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 |
|
error = ccs_check_network_connect_acl(false, type, |
| 646 |
|
(u8 *) &addr4->sin_addr, |
| 647 |
|
port); |
| 648 |
|
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 |
|
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CONNECT)) |
| 656 |
|
error = -EPERM; |
| 657 |
|
break; |
| 658 |
|
} |
| 659 |
|
return error; |
| 660 |
} |
} |
|
EXPORT_SYMBOL(CheckNetworkRecvMsgACL); |
|
| 661 |
|
|
| 662 |
/***** TOMOYO Linux end. *****/ |
/* Check permission for setting the local IP address/port pair of a socket. */ |
| 663 |
|
int ccs_socket_bind_permission(struct socket *sock, struct sockaddr *addr, |
| 664 |
|
int addr_len) |
| 665 |
|
{ |
| 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 |
|
error = ccs_check_network_bind_acl(true, type, |
| 692 |
|
addr6->sin6_addr.s6_addr, |
| 693 |
|
port); |
| 694 |
|
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 |
|
error = ccs_check_network_bind_acl(false, type, |
| 704 |
|
(u8 *) &addr4->sin_addr, |
| 705 |
|
port); |
| 706 |
|
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 |
|
int ccs_socket_accept_permission(struct socket *sock, struct sockaddr *addr) |
| 717 |
|
{ |
| 718 |
|
int error = 0; |
| 719 |
|
int addr_len; |
| 720 |
|
/* Nothing to do if I am a kernel service. */ |
| 721 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
| 722 |
|
return 0; |
| 723 |
|
switch (sock->sk->sk_family) { |
| 724 |
|
case PF_INET: |
| 725 |
|
case PF_INET6: |
| 726 |
|
break; |
| 727 |
|
default: |
| 728 |
|
return 0; |
| 729 |
|
} |
| 730 |
|
error = sock->ops->getname(sock, addr, &addr_len, 2); |
| 731 |
|
if (error) |
| 732 |
|
return error; |
| 733 |
|
switch (addr->sa_family) { |
| 734 |
|
struct sockaddr_in6 *addr6; |
| 735 |
|
struct sockaddr_in *addr4; |
| 736 |
|
case AF_INET6: |
| 737 |
|
addr6 = (struct sockaddr_in6 *) addr; |
| 738 |
|
error = ccs_check_network_accept_acl(true, |
| 739 |
|
addr6->sin6_addr.s6_addr, |
| 740 |
|
addr6->sin6_port); |
| 741 |
|
break; |
| 742 |
|
case AF_INET: |
| 743 |
|
addr4 = (struct sockaddr_in *) addr; |
| 744 |
|
error = ccs_check_network_accept_acl(false, |
| 745 |
|
(u8 *) &addr4->sin_addr, |
| 746 |
|
addr4->sin_port); |
| 747 |
|
break; |
| 748 |
|
} |
| 749 |
|
return error; |
| 750 |
|
} |
| 751 |
|
|
| 752 |
|
/* Check permission for sending a datagram via a UDP or RAW socket. */ |
| 753 |
|
int ccs_socket_sendmsg_permission(struct socket *sock, struct sockaddr *addr, |
| 754 |
|
int addr_len) |
| 755 |
|
{ |
| 756 |
|
int error = 0; |
| 757 |
|
const int type = sock->type; |
| 758 |
|
/* Nothing to do if I am a kernel service. */ |
| 759 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
| 760 |
|
return 0; |
| 761 |
|
if (!addr || (type != SOCK_DGRAM && type != SOCK_RAW)) |
| 762 |
|
return 0; |
| 763 |
|
switch (addr->sa_family) { |
| 764 |
|
struct sockaddr_in6 *addr6; |
| 765 |
|
struct sockaddr_in *addr4; |
| 766 |
|
u16 port; |
| 767 |
|
case AF_INET6: |
| 768 |
|
if (addr_len < SIN6_LEN_RFC2133) |
| 769 |
|
break; |
| 770 |
|
addr6 = (struct sockaddr_in6 *) addr; |
| 771 |
|
if (type == SOCK_DGRAM) |
| 772 |
|
port = addr6->sin6_port; |
| 773 |
|
else |
| 774 |
|
port = htons(sock->sk->sk_protocol); |
| 775 |
|
error = ccs_check_network_sendmsg_acl(true, type, |
| 776 |
|
addr6->sin6_addr.s6_addr, |
| 777 |
|
port); |
| 778 |
|
break; |
| 779 |
|
case AF_INET: |
| 780 |
|
if (addr_len < sizeof(struct sockaddr_in)) |
| 781 |
|
break; |
| 782 |
|
addr4 = (struct sockaddr_in *) addr; |
| 783 |
|
if (type == SOCK_DGRAM) |
| 784 |
|
port = addr4->sin_port; |
| 785 |
|
else |
| 786 |
|
port = htons(sock->sk->sk_protocol); |
| 787 |
|
error = ccs_check_network_sendmsg_acl(false, type, |
| 788 |
|
(u8 *) &addr4->sin_addr, |
| 789 |
|
port); |
| 790 |
|
break; |
| 791 |
|
} |
| 792 |
|
return error; |
| 793 |
|
} |
| 794 |
|
|
| 795 |
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) |
| 796 |
|
#if !defined(RHEL_MAJOR) || RHEL_MAJOR != 5 |
| 797 |
|
|
| 798 |
|
static inline struct iphdr *ip_hdr(const struct sk_buff *skb) |
| 799 |
|
{ |
| 800 |
|
return skb->nh.iph; |
| 801 |
|
} |
| 802 |
|
|
| 803 |
|
static inline struct udphdr *udp_hdr(const struct sk_buff *skb) |
| 804 |
|
{ |
| 805 |
|
return skb->h.uh; |
| 806 |
|
} |
| 807 |
|
|
| 808 |
|
static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) |
| 809 |
|
{ |
| 810 |
|
return skb->nh.ipv6h; |
| 811 |
|
} |
| 812 |
|
|
| 813 |
|
#endif |
| 814 |
|
#endif |
| 815 |
|
|
| 816 |
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 12) |
| 817 |
|
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
| 818 |
|
unsigned int flags) |
| 819 |
|
{ |
| 820 |
|
/* Clear queue. */ |
| 821 |
|
if (flags & MSG_PEEK) { |
| 822 |
|
int clear = 0; |
| 823 |
|
spin_lock_irq(&sk->sk_receive_queue.lock); |
| 824 |
|
if (skb == skb_peek(&sk->sk_receive_queue)) { |
| 825 |
|
__skb_unlink(skb, &sk->sk_receive_queue); |
| 826 |
|
clear = 1; |
| 827 |
|
} |
| 828 |
|
spin_unlock_irq(&sk->sk_receive_queue.lock); |
| 829 |
|
if (clear) |
| 830 |
|
kfree_skb(skb); |
| 831 |
|
} |
| 832 |
|
skb_free_datagram(sk, skb); |
| 833 |
|
} |
| 834 |
|
#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16) |
| 835 |
|
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
| 836 |
|
unsigned int flags) |
| 837 |
|
{ |
| 838 |
|
/* Clear queue. */ |
| 839 |
|
if (flags & MSG_PEEK) { |
| 840 |
|
int clear = 0; |
| 841 |
|
spin_lock_bh(&sk->sk_receive_queue.lock); |
| 842 |
|
if (skb == skb_peek(&sk->sk_receive_queue)) { |
| 843 |
|
__skb_unlink(skb, &sk->sk_receive_queue); |
| 844 |
|
clear = 1; |
| 845 |
|
} |
| 846 |
|
spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 847 |
|
if (clear) |
| 848 |
|
kfree_skb(skb); |
| 849 |
|
} |
| 850 |
|
skb_free_datagram(sk, skb); |
| 851 |
|
} |
| 852 |
|
#endif |
| 853 |
|
|
| 854 |
|
/* |
| 855 |
|
* Check permission for receiving a datagram via a UDP or RAW socket. |
| 856 |
|
* |
| 857 |
|
* Currently, the LSM hook for this purpose is not provided. |
| 858 |
|
*/ |
| 859 |
|
int ccs_socket_recvmsg_permission(struct sock *sk, struct sk_buff *skb, |
| 860 |
|
const unsigned int flags) |
| 861 |
|
{ |
| 862 |
|
int error = 0; |
| 863 |
|
const unsigned int type = sk->sk_type; |
| 864 |
|
if (type != SOCK_DGRAM && type != SOCK_RAW) |
| 865 |
|
return 0; |
| 866 |
|
/* Nothing to do if I am a kernel service. */ |
| 867 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
| 868 |
|
return 0; |
| 869 |
|
|
| 870 |
|
switch (sk->sk_family) { |
| 871 |
|
struct in6_addr sin6; |
| 872 |
|
struct in_addr sin4; |
| 873 |
|
u16 port; |
| 874 |
|
case PF_INET6: |
| 875 |
|
if (type == SOCK_DGRAM) { /* UDP IPv6 */ |
| 876 |
|
if (skb->protocol == htons(ETH_P_IP)) { |
| 877 |
|
ipv6_addr_set(&sin6, 0, 0, htonl(0xffff), |
| 878 |
|
ip_hdr(skb)->saddr); |
| 879 |
|
} else { |
| 880 |
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
| 881 |
|
} |
| 882 |
|
port = udp_hdr(skb)->source; |
| 883 |
|
} else { /* RAW IPv6 */ |
| 884 |
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
| 885 |
|
port = htons(sk->sk_protocol); |
| 886 |
|
} |
| 887 |
|
error = ccs_check_network_recvmsg_acl(true, type, |
| 888 |
|
(u8 *) &sin6, port); |
| 889 |
|
break; |
| 890 |
|
case PF_INET: |
| 891 |
|
if (type == SOCK_DGRAM) { /* UDP IPv4 */ |
| 892 |
|
sin4.s_addr = ip_hdr(skb)->saddr; |
| 893 |
|
port = udp_hdr(skb)->source; |
| 894 |
|
} else { /* RAW IPv4 */ |
| 895 |
|
sin4.s_addr = ip_hdr(skb)->saddr; |
| 896 |
|
port = htons(sk->sk_protocol); |
| 897 |
|
} |
| 898 |
|
error = ccs_check_network_recvmsg_acl(false, type, |
| 899 |
|
(u8 *) &sin4, port); |
| 900 |
|
break; |
| 901 |
|
} |
| 902 |
|
if (!error) |
| 903 |
|
return 0; |
| 904 |
|
/* |
| 905 |
|
* Remove from queue if MSG_PEEK is used so that |
| 906 |
|
* the head message from unwanted source in receive queue will not |
| 907 |
|
* prevent the caller from picking up next message from wanted source |
| 908 |
|
* when the caller is using MSG_PEEK flag for picking up. |
| 909 |
|
*/ |
| 910 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
| 911 |
|
if (type == SOCK_DGRAM) |
| 912 |
|
lock_sock(sk); |
| 913 |
|
#endif |
| 914 |
|
skb_kill_datagram(sk, skb, flags); |
| 915 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
| 916 |
|
if (type == SOCK_DGRAM) |
| 917 |
|
release_sock(sk); |
| 918 |
|
#endif |
| 919 |
|
/* Hope less harmful than -EPERM. */ |
| 920 |
|
return -ENOMEM; |
| 921 |
|
} |
| 922 |
|
EXPORT_SYMBOL(ccs_socket_recvmsg_permission); |
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