| 3 |
* |
* |
| 4 |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
| 5 |
* |
* |
| 6 |
* Version: 1.7.2-pre 2010/03/08 |
* Version: 1.8.0-pre 2010/08/01 |
| 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. |
| 14 |
#include <linux/inet.h> |
#include <linux/inet.h> |
| 15 |
#include <linux/in.h> |
#include <linux/in.h> |
| 16 |
#include <linux/in6.h> |
#include <linux/in6.h> |
| 17 |
|
#include <linux/un.h> |
| 18 |
#include <net/ip.h> |
#include <net/ip.h> |
| 19 |
#include <net/ipv6.h> |
#include <net/ipv6.h> |
| 20 |
#include <net/udp.h> |
#include <net/udp.h> |
| 21 |
#include "internal.h" |
#include "internal.h" |
| 22 |
|
|
| 23 |
|
struct ccs_inet_addr_info { |
| 24 |
|
u16 port; /* In network byte order. */ |
| 25 |
|
const u32 *address; /* In network byte order. */ |
| 26 |
|
bool is_ipv6; |
| 27 |
|
}; |
| 28 |
|
|
| 29 |
|
struct ccs_unix_addr_info { |
| 30 |
|
u8 *addr; |
| 31 |
|
unsigned int addr_len; |
| 32 |
|
}; |
| 33 |
|
|
| 34 |
|
struct ccs_addr_info { |
| 35 |
|
u8 protocol; |
| 36 |
|
u8 operation; |
| 37 |
|
struct ccs_inet_addr_info inet; |
| 38 |
|
struct ccs_unix_addr_info unix0; |
| 39 |
|
}; |
| 40 |
|
|
| 41 |
|
const char *ccs_inet_keyword[CCS_MAX_INET_PROTOCOL] = { |
| 42 |
|
[CCS_NETWORK_INET_TCP_PROTOCOL] = "TCP", |
| 43 |
|
[CCS_NETWORK_INET_UDP_PROTOCOL] = "UDP", |
| 44 |
|
[CCS_NETWORK_INET_RAW_PROTOCOL] = "RAW", |
| 45 |
|
}; |
| 46 |
|
|
| 47 |
|
const char *ccs_unix_keyword[CCS_MAX_UNIX_PROTOCOL] = { |
| 48 |
|
[CCS_NETWORK_UNIX_STREAM_PROTOCOL] = "stream", |
| 49 |
|
[CCS_NETWORK_UNIX_DGRAM_PROTOCOL] = "dgram", |
| 50 |
|
[CCS_NETWORK_UNIX_SEQPACKET_PROTOCOL] = "seqpacket", |
| 51 |
|
}; |
| 52 |
|
|
| 53 |
|
const char *ccs_net_keyword[CCS_MAX_NETWORK_OPERATION] = { |
| 54 |
|
[CCS_NETWORK_BIND] = "bind", |
| 55 |
|
[CCS_NETWORK_LISTEN] = "listen", |
| 56 |
|
[CCS_NETWORK_CONNECT] = "connect", |
| 57 |
|
[CCS_NETWORK_ACCEPT] = "accept", |
| 58 |
|
[CCS_NETWORK_SEND] = "send", |
| 59 |
|
[CCS_NETWORK_RECV] = "recv", |
| 60 |
|
}; |
| 61 |
|
|
| 62 |
|
/** |
| 63 |
|
* ccs_audit_inet_log - Audit INET network log. |
| 64 |
|
* |
| 65 |
|
* @r: Pointer to "struct ccs_request_info". |
| 66 |
|
* |
| 67 |
|
* Returns 0 on success, negative value otherwise. |
| 68 |
|
*/ |
| 69 |
|
static int ccs_audit_inet_log(struct ccs_request_info *r) |
| 70 |
|
{ |
| 71 |
|
char buf[128]; |
| 72 |
|
const char *protocol = |
| 73 |
|
ccs_inet_keyword[r->param.inet_network.protocol]; |
| 74 |
|
const char *operation = ccs_net_keyword[r->param.inet_network.operation]; |
| 75 |
|
const u32 *address = r->param.inet_network.address; |
| 76 |
|
const u16 port = r->param.inet_network.port; |
| 77 |
|
if (r->param.inet_network.is_ipv6) |
| 78 |
|
ccs_print_ipv6(buf, sizeof(buf), (const struct in6_addr *) |
| 79 |
|
address, (const struct in6_addr *) address); |
| 80 |
|
else |
| 81 |
|
ccs_print_ipv4(buf, sizeof(buf), r->param.inet_network.ip, |
| 82 |
|
r->param.inet_network.ip); |
| 83 |
|
ccs_write_log(r, "network inet %s %s %s %u\n", protocol, operation, |
| 84 |
|
buf, port); |
| 85 |
|
if (r->granted) |
| 86 |
|
return 0; |
| 87 |
|
ccs_warn_log(r, "network inet %s %s %s %u", protocol, operation, buf, |
| 88 |
|
port); |
| 89 |
|
return ccs_supervisor(r, "network inet %s %s %s %u\n", protocol, |
| 90 |
|
operation, buf, port); |
| 91 |
|
} |
| 92 |
|
|
| 93 |
/** |
/** |
| 94 |
* ccs_audit_network_log - Audit network log. |
* ccs_audit_unix_log - Audit UNIX network log. |
| 95 |
* |
* |
| 96 |
* @r: Pointer to "struct ccs_request_info". |
* @r: Pointer to "struct ccs_request_info". |
|
* @operation: The name of operation. |
|
|
* @address: An IPv4 or IPv6 address. |
|
|
* @port: Port number. |
|
|
* @is_granted: True if this is a granted log. |
|
| 97 |
* |
* |
| 98 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
| 99 |
*/ |
*/ |
| 100 |
static int ccs_audit_network_log(struct ccs_request_info *r, |
static int ccs_audit_unix_log(struct ccs_request_info *r) |
| 101 |
const char *operation, const char *address, |
{ |
| 102 |
const u16 port, const bool is_granted) |
const char *protocol = |
| 103 |
{ |
ccs_unix_keyword[r->param.unix_network.protocol]; |
| 104 |
if (!is_granted) |
const char *operation = |
| 105 |
ccs_warn_log(r, "%s %s %u", operation, address, port); |
ccs_net_keyword[r->param.unix_network.operation]; |
| 106 |
return ccs_write_audit_log(is_granted, r, CCS_KEYWORD_ALLOW_NETWORK |
const char *address = r->param.unix_network.address->name; |
| 107 |
"%s %s %u\n", operation, address, port); |
ccs_write_log(r, "network unix %s %s %s\n", protocol, operation, |
| 108 |
|
address); |
| 109 |
|
if (r->granted) |
| 110 |
|
return 0; |
| 111 |
|
ccs_warn_log(r, "network unix %s %s %s", protocol, operation, address); |
| 112 |
|
return ccs_supervisor(r, "network unix %s %s %s\n", protocol, |
| 113 |
|
operation, address); |
| 114 |
} |
} |
| 115 |
|
|
| 116 |
/** |
/** |
| 120 |
* @min: Pointer to store min address. |
* @min: Pointer to store min address. |
| 121 |
* @max: Pointer to store max address. |
* @max: Pointer to store max address. |
| 122 |
* |
* |
| 123 |
* Returns 2 if @address is an IPv6, 1 if @address is an IPv4, 0 otherwise. |
* Returns CCS_IP_ADDRESS_TYPE_IPv6 if @address is an IPv6, |
| 124 |
|
* CCS_IP_ADDRESS_TYPE_IPv4 if @address is an IPv4, |
| 125 |
|
* CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP otherwise. |
| 126 |
*/ |
*/ |
| 127 |
int ccs_parse_ip_address(char *address, u16 *min, u16 *max) |
int ccs_parse_ip_address(char *address, u16 *min, u16 *max) |
| 128 |
{ |
{ |
| 140 |
min[i] = htons(min[i]); |
min[i] = htons(min[i]); |
| 141 |
max[i] = htons(max[i]); |
max[i] = htons(max[i]); |
| 142 |
} |
} |
| 143 |
return 2; |
return CCS_IP_ADDRESS_TYPE_IPv6; |
| 144 |
} |
} |
| 145 |
count = sscanf(address, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
count = sscanf(address, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
| 146 |
&min[0], &min[1], &min[2], &min[3], |
&min[0], &min[1], &min[2], &min[3], |
| 150 |
+ (((u8) min[2]) << 8) + (u8) min[3]); |
+ (((u8) min[2]) << 8) + (u8) min[3]); |
| 151 |
memmove(min, &ip, sizeof(ip)); |
memmove(min, &ip, sizeof(ip)); |
| 152 |
if (count == 8) |
if (count == 8) |
| 153 |
ip = htonl((((u8) max[0]) << 24) + (((u8) max[1]) << 16) |
ip = htonl((((u8) max[0]) << 24) |
| 154 |
|
+ (((u8) max[1]) << 16) |
| 155 |
+ (((u8) max[2]) << 8) + (u8) max[3]); |
+ (((u8) max[2]) << 8) + (u8) max[3]); |
| 156 |
memmove(max, &ip, sizeof(ip)); |
memmove(max, &ip, sizeof(ip)); |
| 157 |
return 1; |
return CCS_IP_ADDRESS_TYPE_IPv4; |
| 158 |
} |
} |
| 159 |
return 0; |
return CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP; |
| 160 |
|
} |
| 161 |
|
|
| 162 |
|
/** |
| 163 |
|
* ccs_print_ipv4 - Print an IPv4 address. |
| 164 |
|
* |
| 165 |
|
* @buffer: Buffer to write to. |
| 166 |
|
* @buffer_len: Size of @buffer. |
| 167 |
|
* @min_ip: Min address in host byte order. |
| 168 |
|
* @max_ip: Max address in host byte order. |
| 169 |
|
* |
| 170 |
|
* Returns nothing. |
| 171 |
|
*/ |
| 172 |
|
void ccs_print_ipv4(char *buffer, const int buffer_len, |
| 173 |
|
const u32 min_ip, const u32 max_ip) |
| 174 |
|
{ |
| 175 |
|
memset(buffer, 0, buffer_len); |
| 176 |
|
snprintf(buffer, buffer_len - 1, "%u.%u.%u.%u%c%u.%u.%u.%u", |
| 177 |
|
HIPQUAD(min_ip), min_ip == max_ip ? '\0' : '-', |
| 178 |
|
HIPQUAD(max_ip)); |
| 179 |
} |
} |
| 180 |
|
|
| 181 |
#if !defined(NIP6) |
#if !defined(NIP6) |
| 191 |
* |
* |
| 192 |
* @buffer: Buffer to write to. |
* @buffer: Buffer to write to. |
| 193 |
* @buffer_len: Size of @buffer. |
* @buffer_len: Size of @buffer. |
| 194 |
* @ip: Pointer to "struct in6_addr". |
* @min_ip: Pointer to "struct in6_addr". |
| 195 |
|
* @max_ip: Pointer to "struct in6_addr". |
| 196 |
* |
* |
| 197 |
* Returns nothing. |
* Returns nothing. |
| 198 |
*/ |
*/ |
| 199 |
void ccs_print_ipv6(char *buffer, const int buffer_len, |
void ccs_print_ipv6(char *buffer, const int buffer_len, |
| 200 |
const struct in6_addr *ip) |
const struct in6_addr *min_ip, |
| 201 |
|
const struct in6_addr *max_ip) |
| 202 |
{ |
{ |
| 203 |
memset(buffer, 0, buffer_len); |
memset(buffer, 0, buffer_len); |
| 204 |
snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip)); |
snprintf(buffer, buffer_len - 1, |
| 205 |
} |
"%x:%x:%x:%x:%x:%x:%x:%x%c%x:%x:%x:%x:%x:%x:%x:%x", |
| 206 |
|
NIP6(*min_ip), min_ip == max_ip ? '\0' : '-', |
| 207 |
/** |
NIP6(*max_ip)); |
| 208 |
* ccs_net2keyword - Convert network operation index to network operation name. |
} |
| 209 |
* |
|
| 210 |
* @operation: Type of operation. |
static bool ccs_check_inet_acl(struct ccs_request_info *r, |
| 211 |
* |
const struct ccs_acl_info *ptr) |
| 212 |
* Returns the name of operation. |
{ |
| 213 |
*/ |
const struct ccs_inet_acl *acl = container_of(ptr, typeof(*acl), head); |
| 214 |
const char *ccs_net2keyword(const u8 operation) |
bool ret; |
| 215 |
{ |
if (!(acl->perm & (1 << r->param.inet_network.operation)) || |
| 216 |
const char *keyword = "unknown"; |
!ccs_compare_number_union(r->param.inet_network.port, &acl->port)) |
| 217 |
switch (operation) { |
return false; |
| 218 |
case CCS_NETWORK_UDP_BIND: |
switch (acl->address_type) { |
| 219 |
keyword = "UDP bind"; |
case CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP: |
| 220 |
break; |
ret = ccs_address_matches_group(r->param.inet_network.is_ipv6, |
| 221 |
case CCS_NETWORK_UDP_CONNECT: |
r->param.inet_network.address, |
| 222 |
keyword = "UDP connect"; |
acl->address.group); |
| 223 |
break; |
break; |
| 224 |
case CCS_NETWORK_TCP_BIND: |
case CCS_IP_ADDRESS_TYPE_IPv4: |
| 225 |
keyword = "TCP bind"; |
ret = !r->param.inet_network.is_ipv6 && |
| 226 |
break; |
acl->address.ipv4.min <= r->param.inet_network.ip && |
| 227 |
case CCS_NETWORK_TCP_LISTEN: |
r->param.inet_network.ip <= acl->address.ipv4.max; |
|
keyword = "TCP listen"; |
|
|
break; |
|
|
case CCS_NETWORK_TCP_CONNECT: |
|
|
keyword = "TCP connect"; |
|
|
break; |
|
|
case CCS_NETWORK_TCP_ACCEPT: |
|
|
keyword = "TCP accept"; |
|
|
break; |
|
|
case CCS_NETWORK_RAW_BIND: |
|
|
keyword = "RAW bind"; |
|
|
break; |
|
|
case CCS_NETWORK_RAW_CONNECT: |
|
|
keyword = "RAW connect"; |
|
| 228 |
break; |
break; |
| 229 |
} |
default: |
| 230 |
return keyword; |
ret = r->param.inet_network.is_ipv6 && |
| 231 |
} |
memcmp(acl->address.ipv6.min, |
| 232 |
|
r->param.inet_network.address, 16) <= 0 && |
| 233 |
|
memcmp(r->param.inet_network.address, |
| 234 |
|
acl->address.ipv6.max, 16) <= 0; |
| 235 |
|
break; |
| 236 |
|
} |
| 237 |
|
return ret; |
| 238 |
|
} |
| 239 |
|
|
| 240 |
|
static bool ccs_check_unix_acl(struct ccs_request_info *r, |
| 241 |
|
const struct ccs_acl_info *ptr) |
| 242 |
|
{ |
| 243 |
|
const struct ccs_unix_acl *acl = container_of(ptr, typeof(*acl), head); |
| 244 |
|
return (acl->perm & (1 << r->param.unix_network.operation)) && |
| 245 |
|
ccs_compare_name_union(r->param.unix_network.address, |
| 246 |
|
&acl->name); |
| 247 |
|
} |
| 248 |
|
|
| 249 |
|
static const u8 |
| 250 |
|
ccs_inet2mac[CCS_MAX_INET_PROTOCOL][CCS_MAX_NETWORK_OPERATION] = { |
| 251 |
|
[CCS_NETWORK_INET_TCP_PROTOCOL] = { |
| 252 |
|
[CCS_NETWORK_BIND] = CCS_MAC_NETWORK_INET_TCP_BIND, |
| 253 |
|
[CCS_NETWORK_LISTEN] = CCS_MAC_NETWORK_INET_TCP_LISTEN, |
| 254 |
|
[CCS_NETWORK_CONNECT] = CCS_MAC_NETWORK_INET_TCP_CONNECT, |
| 255 |
|
[CCS_NETWORK_ACCEPT] = CCS_MAC_NETWORK_INET_TCP_ACCEPT, |
| 256 |
|
}, |
| 257 |
|
[CCS_NETWORK_INET_UDP_PROTOCOL] = { |
| 258 |
|
[CCS_NETWORK_BIND] = CCS_MAC_NETWORK_INET_UDP_BIND, |
| 259 |
|
[CCS_NETWORK_SEND] = CCS_MAC_NETWORK_INET_UDP_SEND, |
| 260 |
|
[CCS_NETWORK_RECV] = CCS_MAC_NETWORK_INET_UDP_RECV, |
| 261 |
|
}, |
| 262 |
|
[CCS_NETWORK_INET_RAW_PROTOCOL] = { |
| 263 |
|
[CCS_NETWORK_BIND] = CCS_MAC_NETWORK_INET_RAW_BIND, |
| 264 |
|
[CCS_NETWORK_SEND] = CCS_MAC_NETWORK_INET_RAW_SEND, |
| 265 |
|
[CCS_NETWORK_RECV] = CCS_MAC_NETWORK_INET_RAW_RECV, |
| 266 |
|
}, |
| 267 |
|
}; |
| 268 |
|
|
| 269 |
|
static const u8 |
| 270 |
|
ccs_unix2mac[CCS_MAX_UNIX_PROTOCOL][CCS_MAX_NETWORK_OPERATION] = { |
| 271 |
|
[CCS_NETWORK_UNIX_STREAM_PROTOCOL] = { |
| 272 |
|
[CCS_NETWORK_BIND] = CCS_MAC_NETWORK_UNIX_STREAM_BIND, |
| 273 |
|
[CCS_NETWORK_LISTEN] = CCS_MAC_NETWORK_UNIX_STREAM_LISTEN, |
| 274 |
|
[CCS_NETWORK_CONNECT] = CCS_MAC_NETWORK_UNIX_STREAM_CONNECT, |
| 275 |
|
[CCS_NETWORK_ACCEPT] = CCS_MAC_NETWORK_UNIX_STREAM_ACCEPT, |
| 276 |
|
}, |
| 277 |
|
[CCS_NETWORK_UNIX_DGRAM_PROTOCOL] = { |
| 278 |
|
[CCS_NETWORK_BIND] = CCS_MAC_NETWORK_UNIX_DGRAM_BIND, |
| 279 |
|
[CCS_NETWORK_SEND] = CCS_MAC_NETWORK_UNIX_DGRAM_SEND, |
| 280 |
|
[CCS_NETWORK_RECV] = CCS_MAC_NETWORK_UNIX_DGRAM_RECV, |
| 281 |
|
}, |
| 282 |
|
[CCS_NETWORK_UNIX_SEQPACKET_PROTOCOL] = { |
| 283 |
|
[CCS_NETWORK_BIND] = CCS_MAC_NETWORK_UNIX_SEQPACKET_BIND, |
| 284 |
|
[CCS_NETWORK_LISTEN] = CCS_MAC_NETWORK_UNIX_SEQPACKET_LISTEN, |
| 285 |
|
[CCS_NETWORK_CONNECT] = CCS_MAC_NETWORK_UNIX_SEQPACKET_CONNECT, |
| 286 |
|
[CCS_NETWORK_ACCEPT] = CCS_MAC_NETWORK_UNIX_SEQPACKET_ACCEPT, |
| 287 |
|
}, |
| 288 |
|
}; |
| 289 |
|
|
| 290 |
/** |
/** |
| 291 |
* ccs_network_entry2 - Check permission for network operation. |
* ccs_inet_entry - Check permission for INET network operation. |
| 292 |
* |
* |
| 293 |
* @is_ipv6: True if @address is an IPv6 address. |
* @address: Pointer to "struct ccs_addr_info". |
|
* @operation: Type of operation. |
|
|
* @address: An IPv4 or IPv6 address. |
|
|
* @port: Port number. |
|
| 294 |
* |
* |
| 295 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
| 296 |
*/ |
*/ |
| 297 |
static int ccs_network_entry2(const bool is_ipv6, const u8 operation, |
static int ccs_inet_entry(const struct ccs_addr_info *address) |
|
const u32 *address, const u16 port) |
|
| 298 |
{ |
{ |
| 299 |
|
const int idx = ccs_read_lock(); |
| 300 |
struct ccs_request_info r; |
struct ccs_request_info r; |
| 301 |
struct ccs_acl_info *ptr; |
int error = 0; |
| 302 |
const char *keyword = ccs_net2keyword(operation); |
const u8 type = ccs_inet2mac[address->protocol][address->operation]; |
| 303 |
const u16 perm = 1 << operation; |
if (type && ccs_init_request_info(&r, type) != CCS_CONFIG_DISABLED) { |
| 304 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
r.param_type = CCS_TYPE_INET_ACL; |
| 305 |
const u32 ip = ntohl(*address); |
r.param.inet_network.protocol = address->protocol; |
| 306 |
int error; |
r.param.inet_network.operation = address->operation; |
| 307 |
char buf[64]; |
r.param.inet_network.is_ipv6 = address->inet.is_ipv6; |
| 308 |
if (ccs_init_request_info(&r, NULL, |
r.param.inet_network.address = address->inet.address; |
| 309 |
CCS_MAC_NETWORK_UDP_BIND + operation) |
r.param.inet_network.port = ntohs(address->inet.port); |
| 310 |
== CCS_CONFIG_DISABLED) |
/* use host byte order to allow u32 comparison than memcmp().*/ |
| 311 |
return 0; |
r.param.inet_network.ip = ntohl(*address->inet.address); |
| 312 |
memset(buf, 0, sizeof(buf)); |
do { |
| 313 |
if (is_ipv6) |
ccs_check_acl(&r, ccs_check_inet_acl); |
| 314 |
ccs_print_ipv6(buf, sizeof(buf), (const struct in6_addr *) |
error = ccs_audit_inet_log(&r); |
| 315 |
address); |
} while (error == CCS_RETRY_REQUEST); |
| 316 |
else |
} |
| 317 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
ccs_read_unlock(idx); |
|
do { |
|
|
error = -EPERM; |
|
|
list_for_each_entry_rcu(ptr, &r.domain->acl_info_list, list) { |
|
|
struct ccs_ip_network_acl *acl; |
|
|
if (ptr->is_deleted || |
|
|
ptr->type != CCS_TYPE_IP_NETWORK_ACL) |
|
|
continue; |
|
|
acl = container_of(ptr, struct ccs_ip_network_acl, |
|
|
head); |
|
|
if (!(acl->perm & perm)) |
|
|
continue; |
|
|
if (!ccs_compare_number_union(port, &acl->port) || |
|
|
!ccs_condition(&r, ptr)) |
|
|
continue; |
|
|
switch (acl->address_type) { |
|
|
case CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP: |
|
|
if (!ccs_address_matches_group(is_ipv6, |
|
|
address, |
|
|
acl->address. |
|
|
group)) |
|
|
continue; |
|
|
break; |
|
|
case CCS_IP_ADDRESS_TYPE_IPv4: |
|
|
if (is_ipv6 || ip < acl->address.ipv4.min || |
|
|
acl->address.ipv4.max < ip) |
|
|
continue; |
|
|
break; |
|
|
default: |
|
|
if (!is_ipv6 || |
|
|
memcmp(acl->address.ipv6.min, address, 16) |
|
|
> 0 || |
|
|
memcmp(address, acl->address.ipv6.max, 16) |
|
|
> 0) |
|
|
continue; |
|
|
break; |
|
|
} |
|
|
r.cond = ptr->cond; |
|
|
error = 0; |
|
|
break; |
|
|
} |
|
|
ccs_audit_network_log(&r, keyword, buf, port, !error); |
|
|
if (!error) |
|
|
break; |
|
|
error = ccs_supervisor(&r, CCS_KEYWORD_ALLOW_NETWORK |
|
|
"%s %s %u\n", keyword, buf, port); |
|
|
} while (error == CCS_RETRY_REQUEST); |
|
|
if (r.mode != CCS_CONFIG_ENFORCING) |
|
|
error = 0; |
|
| 318 |
return error; |
return error; |
| 319 |
} |
} |
| 320 |
|
|
| 321 |
/** |
/** |
| 322 |
* ccs_network_entry - Check permission for network operation. |
* ccs_unix_entry - Check permission for UNIX network operation. |
| 323 |
* |
* |
| 324 |
* @is_ipv6: True if @address is an IPv6 address. |
* @address: Pointer to "struct ccs_addr_info". |
|
* @operation: Type of operation. |
|
|
* @address: An IPv4 or IPv6 address. |
|
|
* @port: Port number. |
|
| 325 |
* |
* |
| 326 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
| 327 |
*/ |
*/ |
| 328 |
static int ccs_network_entry(const bool is_ipv6, const u8 operation, |
static int ccs_unix_entry(const struct ccs_addr_info *address) |
|
const u32 *address, const u16 port) |
|
| 329 |
{ |
{ |
| 330 |
const int idx = ccs_read_lock(); |
const int idx = ccs_read_lock(); |
| 331 |
const int error = ccs_network_entry2(is_ipv6, operation, address, |
struct ccs_request_info r; |
| 332 |
port); |
int error = 0; |
| 333 |
|
const u8 type = ccs_unix2mac[address->protocol][address->operation]; |
| 334 |
|
if (type && address->unix0.addr_len > sizeof(sa_family_t) && |
| 335 |
|
ccs_init_request_info(&r, type) != CCS_CONFIG_DISABLED) { |
| 336 |
|
char *buf; |
| 337 |
|
if (address->unix0.addr[0]) |
| 338 |
|
buf = ccs_encode(address->unix0.addr); |
| 339 |
|
else |
| 340 |
|
buf = ccs_encode2(address->unix0.addr, |
| 341 |
|
address->unix0.addr_len |
| 342 |
|
- sizeof(sa_family_t)); |
| 343 |
|
if (buf) { |
| 344 |
|
struct ccs_path_info addr; |
| 345 |
|
addr.name = buf; |
| 346 |
|
ccs_fill_path_info(&addr); |
| 347 |
|
r.param_type = CCS_TYPE_UNIX_ACL; |
| 348 |
|
r.param.unix_network.protocol = address->protocol; |
| 349 |
|
r.param.unix_network.operation = address->operation; |
| 350 |
|
r.param.unix_network.address = &addr; |
| 351 |
|
do { |
| 352 |
|
ccs_check_acl(&r, ccs_check_unix_acl); |
| 353 |
|
error = ccs_audit_unix_log(&r); |
| 354 |
|
} while (error == CCS_RETRY_REQUEST); |
| 355 |
|
kfree(buf); |
| 356 |
|
} else |
| 357 |
|
error = -ENOMEM; |
| 358 |
|
} |
| 359 |
ccs_read_unlock(idx); |
ccs_read_unlock(idx); |
| 360 |
return error; |
return error; |
| 361 |
} |
} |
| 362 |
|
|
| 363 |
|
static bool ccs_same_inet_acl(const struct ccs_acl_info *a, |
| 364 |
|
const struct ccs_acl_info *b) |
| 365 |
|
{ |
| 366 |
|
const struct ccs_inet_acl *p1 = container_of(a, typeof(*p1), |
| 367 |
|
head); |
| 368 |
|
const struct ccs_inet_acl *p2 = container_of(b, typeof(*p2), |
| 369 |
|
head); |
| 370 |
|
return ccs_same_acl_head(&p1->head, &p2->head) |
| 371 |
|
&& p1->protocol == p2->protocol |
| 372 |
|
&& p1->address_type == p2->address_type && |
| 373 |
|
p1->address.ipv4.min == p2->address.ipv4.min && |
| 374 |
|
p1->address.ipv6.min == p2->address.ipv6.min && |
| 375 |
|
p1->address.ipv4.max == p2->address.ipv4.max && |
| 376 |
|
p1->address.ipv6.max == p2->address.ipv6.max && |
| 377 |
|
p1->address.group == p2->address.group && |
| 378 |
|
ccs_same_number_union(&p1->port, &p2->port); |
| 379 |
|
} |
| 380 |
|
|
| 381 |
|
static bool ccs_same_unix_acl(const struct ccs_acl_info *a, |
| 382 |
|
const struct ccs_acl_info *b) |
| 383 |
|
{ |
| 384 |
|
const struct ccs_unix_acl *p1 = container_of(a, typeof(*p1), |
| 385 |
|
head); |
| 386 |
|
const struct ccs_unix_acl *p2 = container_of(b, typeof(*p2), |
| 387 |
|
head); |
| 388 |
|
return ccs_same_acl_head(&p1->head, &p2->head) && |
| 389 |
|
p1->protocol == p2->protocol && |
| 390 |
|
ccs_same_name_union(&p1->name, &p2->name); |
| 391 |
|
} |
| 392 |
|
|
| 393 |
|
static bool ccs_merge_inet_acl(struct ccs_acl_info *a, |
| 394 |
|
struct ccs_acl_info *b, |
| 395 |
|
const bool is_delete) |
| 396 |
|
{ |
| 397 |
|
u8 * const a_perm = &container_of(a, struct ccs_inet_acl, head) |
| 398 |
|
->perm; |
| 399 |
|
u8 perm = *a_perm; |
| 400 |
|
const u8 b_perm = container_of(b, struct ccs_inet_acl, head) |
| 401 |
|
->perm; |
| 402 |
|
if (is_delete) |
| 403 |
|
perm &= ~b_perm; |
| 404 |
|
else |
| 405 |
|
perm |= b_perm; |
| 406 |
|
*a_perm = perm; |
| 407 |
|
return !perm; |
| 408 |
|
} |
| 409 |
|
|
| 410 |
|
static bool ccs_merge_unix_acl(struct ccs_acl_info *a, |
| 411 |
|
struct ccs_acl_info *b, |
| 412 |
|
const bool is_delete) |
| 413 |
|
{ |
| 414 |
|
u8 * const a_perm = &container_of(a, struct ccs_unix_acl, head) |
| 415 |
|
->perm; |
| 416 |
|
u8 perm = *a_perm; |
| 417 |
|
const u8 b_perm = container_of(b, struct ccs_unix_acl, head) |
| 418 |
|
->perm; |
| 419 |
|
if (is_delete) |
| 420 |
|
perm &= ~b_perm; |
| 421 |
|
else |
| 422 |
|
perm |= b_perm; |
| 423 |
|
*a_perm = perm; |
| 424 |
|
return !perm; |
| 425 |
|
} |
| 426 |
|
|
| 427 |
/** |
/** |
| 428 |
* ccs_write_network_policy - Write "struct ccs_ip_network_acl" list. |
* ccs_write_inet_network - Write "struct ccs_inet_acl" list. |
| 429 |
* |
* |
| 430 |
* @data: String to parse. |
* @data: String to parse. |
| 431 |
* @domain: Pointer to "struct ccs_domain_info". |
* @domain: Pointer to "struct ccs_domain_info". |
| 432 |
* @condition: Pointer to "struct ccs_condition". May be NULL. |
* @condition: Pointer to "struct ccs_condition". Maybe NULL. |
| 433 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
| 434 |
* |
* |
| 435 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
| 436 |
*/ |
*/ |
| 437 |
int ccs_write_network_policy(char *data, struct ccs_domain_info *domain, |
int ccs_write_inet_network(char *data, struct ccs_domain_info *domain, |
| 438 |
struct ccs_condition *condition, |
struct ccs_condition *condition, |
| 439 |
const bool is_delete) |
const bool is_delete) |
| 440 |
{ |
{ |
| 441 |
struct ccs_ip_network_acl *entry = NULL; |
struct ccs_inet_acl e = { |
| 442 |
struct ccs_acl_info *ptr; |
.head.type = CCS_TYPE_INET_ACL, |
|
struct ccs_ip_network_acl e = { |
|
|
.head.type = CCS_TYPE_IP_NETWORK_ACL, |
|
| 443 |
.head.cond = condition, |
.head.cond = condition, |
| 444 |
}; |
}; |
| 445 |
u16 min_address[8]; |
u16 min_address[8]; |
| 446 |
u16 max_address[8]; |
u16 max_address[8]; |
| 447 |
int error = is_delete ? -ENOENT : -ENOMEM; |
int error = is_delete ? -ENOENT : -ENOMEM; |
| 448 |
u8 sock_type; |
u8 type; |
| 449 |
char *w[4]; |
char *w[4]; |
| 450 |
if (!ccs_tokenize(data, w, sizeof(w)) || !w[3][0]) |
if (!ccs_tokenize(data, w, sizeof(w)) || !w[3][0]) |
| 451 |
return -EINVAL; |
return -EINVAL; |
| 452 |
if (!strcmp(w[0], "TCP")) |
for (e.protocol = 0; e.protocol < CCS_MAX_INET_PROTOCOL; |
| 453 |
sock_type = SOCK_STREAM; |
e.protocol++) |
| 454 |
else if (!strcmp(w[0], "UDP")) |
if (!strcmp(w[0], ccs_inet_keyword[e.protocol])) |
| 455 |
sock_type = SOCK_DGRAM; |
break; |
| 456 |
else if (!strcmp(w[0], "RAW")) |
for (type = 0; type < CCS_MAX_NETWORK_OPERATION; type++) |
| 457 |
sock_type = SOCK_RAW; |
if (ccs_permstr(w[1], ccs_net_keyword[type])) |
| 458 |
else |
e.perm |= 1 << type; |
| 459 |
return -EINVAL; |
if (e.protocol == CCS_MAX_INET_PROTOCOL || !e.perm) |
|
if (!strcmp(w[1], "bind")) |
|
|
switch (sock_type) { |
|
|
case SOCK_STREAM: |
|
|
e.perm = 1 << CCS_NETWORK_TCP_BIND; |
|
|
break; |
|
|
case SOCK_DGRAM: |
|
|
e.perm = 1 << CCS_NETWORK_UDP_BIND; |
|
|
break; |
|
|
default: |
|
|
e.perm = 1 << CCS_NETWORK_RAW_BIND; |
|
|
break; |
|
|
} |
|
|
else if (!strcmp(w[1], "connect")) |
|
|
switch (sock_type) { |
|
|
case SOCK_STREAM: |
|
|
e.perm = 1 << CCS_NETWORK_TCP_CONNECT; |
|
|
break; |
|
|
case SOCK_DGRAM: |
|
|
e.perm = 1 << CCS_NETWORK_UDP_CONNECT; |
|
|
break; |
|
|
default: |
|
|
e.perm = 1 << CCS_NETWORK_RAW_CONNECT; |
|
|
break; |
|
|
} |
|
|
else if (sock_type == SOCK_STREAM && !strcmp(w[1], "listen")) |
|
|
e.perm = 1 << CCS_NETWORK_TCP_LISTEN; |
|
|
else if (sock_type == SOCK_STREAM && !strcmp(w[1], "accept")) |
|
|
e.perm = 1 << CCS_NETWORK_TCP_ACCEPT; |
|
|
else |
|
| 460 |
return -EINVAL; |
return -EINVAL; |
| 461 |
switch (ccs_parse_ip_address(w[2], min_address, max_address)) { |
switch (ccs_parse_ip_address(w[2], min_address, max_address)) { |
| 462 |
case 2: |
case CCS_IP_ADDRESS_TYPE_IPv6: |
| 463 |
e.address_type = CCS_IP_ADDRESS_TYPE_IPv6; |
e.address_type = CCS_IP_ADDRESS_TYPE_IPv6; |
| 464 |
e.address.ipv6.min = ccs_get_ipv6_address((struct in6_addr *) |
e.address.ipv6.min = ccs_get_ipv6_address((struct in6_addr *) |
| 465 |
min_address); |
min_address); |
| 466 |
e.address.ipv6.max = ccs_get_ipv6_address((struct in6_addr *) |
e.address.ipv6.max = ccs_get_ipv6_address((struct in6_addr *) |
| 467 |
max_address); |
max_address); |
| 468 |
if (!e.address.ipv6.min || !e.address.ipv6.max) |
if (!e.address.ipv6.min || !e.address.ipv6.max) |
| 469 |
goto out; |
goto out; |
| 470 |
break; |
break; |
| 471 |
case 1: |
case CCS_IP_ADDRESS_TYPE_IPv4: |
| 472 |
e.address_type = CCS_IP_ADDRESS_TYPE_IPv4; |
e.address_type = CCS_IP_ADDRESS_TYPE_IPv4; |
| 473 |
/* use host byte order to allow u32 comparison.*/ |
/* use host byte order to allow u32 comparison.*/ |
| 474 |
e.address.ipv4.min = ntohl(*(u32 *) min_address); |
e.address.ipv4.min = ntohl(*(u32 *) min_address); |
| 478 |
if (w[2][0] != '@') |
if (w[2][0] != '@') |
| 479 |
return -EINVAL; |
return -EINVAL; |
| 480 |
e.address_type = CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP; |
e.address_type = CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP; |
| 481 |
e.address.group = ccs_get_address_group(w[2] + 1); |
e.address.group = ccs_get_group(w[2] + 1, CCS_ADDRESS_GROUP); |
| 482 |
if (!e.address.group) |
if (!e.address.group) |
| 483 |
return -ENOMEM; |
return -ENOMEM; |
| 484 |
break; |
break; |
| 485 |
} |
} |
| 486 |
if (!ccs_parse_number_union(w[3], &e.port)) |
if (!ccs_parse_number_union(w[3], &e.port)) |
| 487 |
goto out; |
goto out; |
| 488 |
if (!is_delete) |
error = ccs_update_domain(&e.head, sizeof(e), is_delete, domain, |
| 489 |
entry = kmalloc(sizeof(e), GFP_KERNEL); |
ccs_same_inet_acl, ccs_merge_inet_acl); |
|
mutex_lock(&ccs_policy_lock); |
|
|
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
|
|
struct ccs_ip_network_acl *acl = |
|
|
container_of(ptr, struct ccs_ip_network_acl, head); |
|
|
if (ptr->type != CCS_TYPE_IP_NETWORK_ACL || |
|
|
ptr->cond != condition || |
|
|
ccs_memcmp(acl, &e, offsetof(typeof(e), address_type), |
|
|
sizeof(e))) |
|
|
continue; |
|
|
if (is_delete) { |
|
|
acl->perm &= ~e.perm; |
|
|
if (!acl->perm) |
|
|
ptr->is_deleted = true; |
|
|
} else { |
|
|
if (ptr->is_deleted) |
|
|
acl->perm = 0; |
|
|
acl->perm |= e.perm; |
|
|
ptr->is_deleted = false; |
|
|
} |
|
|
error = 0; |
|
|
break; |
|
|
} |
|
|
if (!is_delete && error && ccs_commit_ok(entry, &e, sizeof(e))) { |
|
|
ccs_add_domain_acl(domain, &entry->head); |
|
|
entry = NULL; |
|
|
error = 0; |
|
|
} |
|
|
mutex_unlock(&ccs_policy_lock); |
|
| 490 |
out: |
out: |
| 491 |
if (w[2][0] == '@') |
if (e.address_type == CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP) |
| 492 |
ccs_put_address_group(e.address.group); |
ccs_put_group(e.address.group); |
| 493 |
else if (e.address_type == CCS_IP_ADDRESS_TYPE_IPv6) { |
else if (e.address_type == CCS_IP_ADDRESS_TYPE_IPv6) { |
| 494 |
ccs_put_ipv6_address(e.address.ipv6.min); |
ccs_put_ipv6_address(e.address.ipv6.min); |
| 495 |
ccs_put_ipv6_address(e.address.ipv6.max); |
ccs_put_ipv6_address(e.address.ipv6.max); |
| 496 |
} |
} |
| 497 |
ccs_put_number_union(&e.port); |
ccs_put_number_union(&e.port); |
|
kfree(entry); |
|
| 498 |
return error; |
return error; |
| 499 |
} |
} |
| 500 |
|
|
| 501 |
/** |
/** |
| 502 |
* ccs_network_listen_acl - Check permission for listen() operation. |
* ccs_write_unix_network - Write "struct ccs_unix_acl" list. |
| 503 |
* |
* |
| 504 |
* @is_ipv6: True if @address is an IPv6 address. |
* @data: String to parse. |
| 505 |
* @address: An IPv4 or IPv6 address. |
* @domain: Pointer to "struct ccs_domain_info". |
| 506 |
* @port: Port number. |
* @condition: Pointer to "struct ccs_condition". Maybe NULL. |
| 507 |
|
* @is_delete: True if it is a delete request. |
| 508 |
* |
* |
| 509 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
| 510 |
*/ |
*/ |
| 511 |
static inline int ccs_network_listen_acl(const bool is_ipv6, const u8 *address, |
int ccs_write_unix_network(char *data, struct ccs_domain_info *domain, |
| 512 |
const u16 port) |
struct ccs_condition *condition, |
| 513 |
|
const bool is_delete) |
| 514 |
{ |
{ |
| 515 |
return ccs_network_entry(is_ipv6, CCS_NETWORK_TCP_LISTEN, |
struct ccs_unix_acl e = { |
| 516 |
(const u32 *) address, ntohs(port)); |
.head.type = CCS_TYPE_UNIX_ACL, |
| 517 |
|
.head.cond = condition, |
| 518 |
|
}; |
| 519 |
|
int error = is_delete ? -ENOENT : -ENOMEM; |
| 520 |
|
u8 type; |
| 521 |
|
char *w[3]; |
| 522 |
|
if (!ccs_tokenize(data, w, sizeof(w)) || !w[2][0]) |
| 523 |
|
return -EINVAL; |
| 524 |
|
for (e.protocol = 0; e.protocol < CCS_MAX_UNIX_PROTOCOL; |
| 525 |
|
e.protocol++) |
| 526 |
|
if (!strcmp(w[0], ccs_unix_keyword[e.protocol])) |
| 527 |
|
break; |
| 528 |
|
for (type = 0; type < CCS_MAX_NETWORK_OPERATION; type++) |
| 529 |
|
if (ccs_permstr(w[1], ccs_net_keyword[type])) |
| 530 |
|
e.perm |= 1 << type; |
| 531 |
|
if (e.protocol == CCS_MAX_UNIX_PROTOCOL || !e.perm) |
| 532 |
|
return -EINVAL; |
| 533 |
|
if (!ccs_parse_name_union(w[2], &e.name)) |
| 534 |
|
return -EINVAL; |
| 535 |
|
error = ccs_update_domain(&e.head, sizeof(e), is_delete, domain, |
| 536 |
|
ccs_same_unix_acl, ccs_merge_unix_acl); |
| 537 |
|
ccs_put_name_union(&e.name); |
| 538 |
|
return error; |
| 539 |
} |
} |
| 540 |
|
|
| 541 |
/** |
#ifndef CONFIG_NET |
| 542 |
* ccs_network_connect_acl - Check permission for connect() operation. |
|
| 543 |
* |
void __init ccs_network_init(void) |
|
* @is_ipv6: True if @address is an IPv6 address. |
|
|
* @sock_type: Type of socket. (TCP or UDP or RAW) |
|
|
* @address: An IPv4 or IPv6 address. |
|
|
* @port: Port number. |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static inline int ccs_network_connect_acl(const bool is_ipv6, |
|
|
const int sock_type, |
|
|
const u8 *address, const u16 port) |
|
| 544 |
{ |
{ |
|
u8 operation; |
|
|
switch (sock_type) { |
|
|
case SOCK_STREAM: |
|
|
operation = CCS_NETWORK_TCP_CONNECT; |
|
|
break; |
|
|
case SOCK_DGRAM: |
|
|
operation = CCS_NETWORK_UDP_CONNECT; |
|
|
break; |
|
|
default: |
|
|
operation = CCS_NETWORK_RAW_CONNECT; |
|
|
} |
|
|
return ccs_network_entry(is_ipv6, operation, |
|
|
(const u32 *) address, ntohs(port)); |
|
| 545 |
} |
} |
| 546 |
|
|
| 547 |
/** |
#else |
| 548 |
* ccs_network_bind_acl - Check permission for bind() operation. |
|
| 549 |
* |
static bool ccs_check_inet_address(const struct sockaddr *addr, |
| 550 |
* @is_ipv6: True if @address is an IPv6 address. |
const unsigned int addr_len, |
| 551 |
* @sock_type: Type of socket. (TCP or UDP or RAW) |
struct ccs_inet_addr_info *address) |
|
* @address: An IPv4 or IPv6 address. |
|
|
* @port: Port number. |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static int ccs_network_bind_acl(const bool is_ipv6, const int sock_type, |
|
|
const u8 *address, const u16 port) |
|
| 552 |
{ |
{ |
| 553 |
u8 operation; |
switch (addr->sa_family) { |
| 554 |
switch (sock_type) { |
case AF_INET6: |
| 555 |
case SOCK_STREAM: |
if (addr_len < SIN6_LEN_RFC2133) |
| 556 |
operation = CCS_NETWORK_TCP_BIND; |
goto skip; |
| 557 |
|
address->is_ipv6 = true; |
| 558 |
|
address->address = (u32 *) |
| 559 |
|
((struct sockaddr_in6 *) addr)->sin6_addr.s6_addr; |
| 560 |
|
address->port = ((struct sockaddr_in6 *) addr)->sin6_port; |
| 561 |
break; |
break; |
| 562 |
case SOCK_DGRAM: |
case AF_INET: |
| 563 |
operation = CCS_NETWORK_UDP_BIND; |
if (addr_len < sizeof(struct sockaddr_in)) |
| 564 |
|
goto skip; |
| 565 |
|
address->is_ipv6 = false; |
| 566 |
|
address->address = (u32 *) |
| 567 |
|
&((struct sockaddr_in *) addr)->sin_addr; |
| 568 |
|
address->port = ((struct sockaddr_in *) addr)->sin_port; |
| 569 |
break; |
break; |
| 570 |
default: |
default: |
| 571 |
operation = CCS_NETWORK_RAW_BIND; |
goto skip; |
| 572 |
} |
} |
| 573 |
return ccs_network_entry(is_ipv6, operation, |
return true; |
| 574 |
(const u32 *) address, ntohs(port)); |
skip: |
| 575 |
|
return false; |
| 576 |
} |
} |
| 577 |
|
|
| 578 |
/** |
static bool ccs_check_unix_address(struct sockaddr *addr, |
| 579 |
* ccs_network_accept_acl - Check permission for accept() operation. |
const unsigned int addr_len, |
| 580 |
* |
struct ccs_unix_addr_info *address) |
|
* @is_ipv6: True if @address is an IPv6 address. |
|
|
* @address: An IPv4 or IPv6 address. |
|
|
* @port: Port number. |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static inline int ccs_network_accept_acl(const bool is_ipv6, const u8 *address, |
|
|
const u16 port) |
|
| 581 |
{ |
{ |
| 582 |
int retval; |
if (addr->sa_family != AF_UNIX) |
| 583 |
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
return false; |
| 584 |
retval = ccs_network_entry(is_ipv6, CCS_NETWORK_TCP_ACCEPT, |
address->addr = ((struct sockaddr_un *) addr)->sun_path; |
| 585 |
(const u32 *) address, ntohs(port)); |
address->addr_len = addr_len; |
| 586 |
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
/* |
| 587 |
return retval; |
* Terminate pathname with '\0' like unix_mkname() does. |
| 588 |
|
* This is needed because pathname was copied by move_addr_to_kernel() |
| 589 |
|
* but not yet terminated by unix_mkname(). |
| 590 |
|
*/ |
| 591 |
|
if (address->addr[0] && addr_len > sizeof(short) && |
| 592 |
|
addr_len <= sizeof(struct sockaddr_un)) |
| 593 |
|
((char *) addr)[addr_len] = '\0'; |
| 594 |
|
return true; |
| 595 |
} |
} |
| 596 |
|
|
| 597 |
/** |
static bool ccs_kernel_service(void) |
|
* ccs_network_sendmsg_acl - Check permission for sendmsg() operation. |
|
|
* |
|
|
* @is_ipv6: True if @address is an IPv6 address. |
|
|
* @sock_type: Type of socket. (UDP or RAW) |
|
|
* @address: An IPv4 or IPv6 address. |
|
|
* @port: Port number. |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static inline int ccs_network_sendmsg_acl(const bool is_ipv6, |
|
|
const int sock_type, |
|
|
const u8 *address, const u16 port) |
|
| 598 |
{ |
{ |
| 599 |
u8 operation; |
/* Nothing to do if I am a kernel service. */ |
| 600 |
if (sock_type == SOCK_DGRAM) |
return segment_eq(get_fs(), KERNEL_DS); |
|
operation = CCS_NETWORK_UDP_CONNECT; |
|
|
else |
|
|
operation = CCS_NETWORK_RAW_CONNECT; |
|
|
return ccs_network_entry(is_ipv6, operation, |
|
|
(const u32 *) address, ntohs(port)); |
|
| 601 |
} |
} |
| 602 |
|
|
| 603 |
/** |
static u8 ccs_sock_family(struct socket *sock) |
| 604 |
* ccs_network_recvmsg_acl - Check permission for recvmsg() operation. |
{ |
| 605 |
* |
if (ccs_kernel_service()) |
| 606 |
* @is_ipv6: True if @address is an IPv6 address. |
return 0; |
| 607 |
* @sock_type: Type of socket. (UDP or RAW) |
switch (sock->sk->sk_family) { |
| 608 |
* @address: An IPv4 or IPv6 address. |
case PF_INET: |
| 609 |
* @port: Port number. |
case PF_INET6: |
| 610 |
* |
return 1; |
| 611 |
* Returns 0 on success, negative value otherwise. |
case PF_UNIX: |
| 612 |
*/ |
return 2; |
| 613 |
static inline int ccs_network_recvmsg_acl(const bool is_ipv6, |
default: |
| 614 |
const int sock_type, |
return 0; |
| 615 |
const u8 *address, const u16 port) |
} |
|
{ |
|
|
int retval; |
|
|
const u8 operation |
|
|
= (sock_type == SOCK_DGRAM) ? |
|
|
CCS_NETWORK_UDP_CONNECT : CCS_NETWORK_RAW_CONNECT; |
|
|
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
|
|
retval = ccs_network_entry(is_ipv6, operation, |
|
|
(const u32 *) address, ntohs(port)); |
|
|
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
|
|
return retval; |
|
| 616 |
} |
} |
| 617 |
|
|
|
#define MAX_SOCK_ADDR 128 /* net/socket.c */ |
|
|
|
|
| 618 |
/* Check permission for creating a socket. */ |
/* Check permission for creating a socket. */ |
| 619 |
static int __ccs_socket_create_permission(int family, int type, int protocol) |
static int __ccs_socket_create_permission(int family, int type, int protocol) |
| 620 |
{ |
{ |
| 621 |
int error = 0; |
if (ccs_kernel_service()) |
|
/* Nothing to do if I am a kernel service. */ |
|
|
if (segment_eq(get_fs(), KERNEL_DS)) |
|
| 622 |
return 0; |
return 0; |
| 623 |
if (family == PF_PACKET && !ccs_capable(CCS_USE_PACKET_SOCKET)) |
if (family == PF_PACKET && !ccs_capable(CCS_USE_PACKET_SOCKET)) |
| 624 |
return -EPERM; |
return -EPERM; |
| 625 |
if (family == PF_ROUTE && !ccs_capable(CCS_USE_ROUTE_SOCKET)) |
if (family == PF_ROUTE && !ccs_capable(CCS_USE_ROUTE_SOCKET)) |
| 626 |
return -EPERM; |
return -EPERM; |
| 627 |
if (family != PF_INET && family != PF_INET6) |
return 0; |
|
return 0; |
|
|
switch (type) { |
|
|
case SOCK_STREAM: |
|
|
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CREATE)) |
|
|
error = -EPERM; |
|
|
break; |
|
|
case SOCK_DGRAM: |
|
|
if (!ccs_capable(CCS_USE_INET_DGRAM_SOCKET)) |
|
|
error = -EPERM; |
|
|
break; |
|
|
case SOCK_RAW: |
|
|
if (!ccs_capable(CCS_USE_INET_RAW_SOCKET)) |
|
|
error = -EPERM; |
|
|
break; |
|
|
} |
|
|
return error; |
|
| 628 |
} |
} |
| 629 |
|
|
| 630 |
/* Check permission for listening a TCP socket. */ |
/* Check permission for listening a socket. */ |
| 631 |
static int __ccs_socket_listen_permission(struct socket *sock) |
static int __ccs_socket_listen_permission(struct socket *sock) |
| 632 |
{ |
{ |
| 633 |
int error = 0; |
struct sockaddr_storage addr; |
| 634 |
char addr[MAX_SOCK_ADDR]; |
int error; |
| 635 |
int addr_len; |
int addr_len; |
| 636 |
/* Nothing to do if I am a kernel service. */ |
struct ccs_addr_info address; |
| 637 |
if (segment_eq(get_fs(), KERNEL_DS)) |
const u8 family = ccs_sock_family(sock); |
| 638 |
return 0; |
const unsigned int type = sock->type; |
| 639 |
if (sock->type != SOCK_STREAM) |
if (!family || (type != SOCK_STREAM && type != SOCK_SEQPACKET)) |
|
return 0; |
|
|
switch (sock->sk->sk_family) { |
|
|
case PF_INET: |
|
|
case PF_INET6: |
|
|
break; |
|
|
default: |
|
| 640 |
return 0; |
return 0; |
| 641 |
|
error = sock->ops->getname(sock, (struct sockaddr *) &addr, &addr_len, |
| 642 |
|
0); |
| 643 |
|
if (error) |
| 644 |
|
return error; |
| 645 |
|
address.operation = CCS_NETWORK_LISTEN; |
| 646 |
|
if (family == 2) { |
| 647 |
|
if (type == SOCK_STREAM) |
| 648 |
|
address.protocol = CCS_NETWORK_UNIX_STREAM_PROTOCOL; |
| 649 |
|
else |
| 650 |
|
address.protocol = CCS_NETWORK_UNIX_SEQPACKET_PROTOCOL; |
| 651 |
|
if (ccs_check_unix_address((struct sockaddr *) &addr, addr_len, |
| 652 |
|
&address.unix0)) |
| 653 |
|
error = ccs_unix_entry(&address); |
| 654 |
|
} else { |
| 655 |
|
address.protocol = CCS_NETWORK_INET_TCP_PROTOCOL; |
| 656 |
|
if (ccs_check_inet_address((struct sockaddr *) &addr, addr_len, |
| 657 |
|
&address.inet)) |
| 658 |
|
error = ccs_inet_entry(&address); |
| 659 |
} |
} |
| 660 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_LISTEN)) |
return error; |
|
return -EPERM; |
|
|
if (sock->ops->getname(sock, (struct sockaddr *) addr, &addr_len, 0)) |
|
|
return -EPERM; |
|
|
switch (((struct sockaddr *) addr)->sa_family) { |
|
|
struct sockaddr_in6 *addr6; |
|
|
struct sockaddr_in *addr4; |
|
|
case AF_INET6: |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
|
|
error = ccs_network_listen_acl(true, |
|
|
addr6->sin6_addr.s6_addr, |
|
|
addr6->sin6_port); |
|
|
break; |
|
|
case AF_INET: |
|
|
addr4 = (struct sockaddr_in *) addr; |
|
|
error = ccs_network_listen_acl(false, |
|
|
(u8 *) &addr4->sin_addr, |
|
|
addr4->sin_port); |
|
|
break; |
|
|
} |
|
|
return error; |
|
| 661 |
} |
} |
| 662 |
|
|
| 663 |
/* Check permission for setting the remote IP address/port pair of a socket. */ |
/* Check permission for setting the remote address of a socket. */ |
| 664 |
static int __ccs_socket_connect_permission(struct socket *sock, |
static int __ccs_socket_connect_permission(struct socket *sock, |
| 665 |
struct sockaddr *addr, int addr_len) |
struct sockaddr *addr, int addr_len) |
| 666 |
{ |
{ |
| 667 |
int error = 0; |
int error = 0; |
| 668 |
const unsigned int type = sock->type; |
const unsigned int type = sock->type; |
| 669 |
/* Nothing to do if I am a kernel service. */ |
struct ccs_addr_info address; |
| 670 |
if (segment_eq(get_fs(), KERNEL_DS)) |
const u8 family = ccs_sock_family(sock); |
| 671 |
return 0; |
if (!family) |
| 672 |
switch (type) { |
return 0; |
| 673 |
case SOCK_STREAM: |
address.operation = CCS_NETWORK_CONNECT; |
| 674 |
case SOCK_DGRAM: |
if (family == 2) { |
| 675 |
case SOCK_RAW: |
switch (type) { |
| 676 |
break; |
case SOCK_STREAM: |
| 677 |
default: |
address.protocol = CCS_NETWORK_UNIX_STREAM_PROTOCOL; |
|
return 0; |
|
|
} |
|
|
switch (addr->sa_family) { |
|
|
struct sockaddr_in6 *addr6; |
|
|
struct sockaddr_in *addr4; |
|
|
u16 port; |
|
|
case AF_INET6: |
|
|
if (addr_len < SIN6_LEN_RFC2133) |
|
| 678 |
break; |
break; |
| 679 |
addr6 = (struct sockaddr_in6 *) addr; |
case SOCK_DGRAM: |
| 680 |
if (type != SOCK_RAW) |
address.protocol = CCS_NETWORK_UNIX_DGRAM_PROTOCOL; |
| 681 |
port = addr6->sin6_port; |
address.operation = CCS_NETWORK_SEND; |
|
else |
|
|
port = htons(sock->sk->sk_protocol); |
|
|
error = ccs_network_connect_acl(true, type, |
|
|
addr6->sin6_addr.s6_addr, |
|
|
port); |
|
|
break; |
|
|
case AF_INET: |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
|
| 682 |
break; |
break; |
| 683 |
addr4 = (struct sockaddr_in *) addr; |
case SOCK_SEQPACKET: |
| 684 |
if (type != SOCK_RAW) |
address.protocol = CCS_NETWORK_UNIX_SEQPACKET_PROTOCOL; |
| 685 |
port = addr4->sin_port; |
break; |
| 686 |
else |
default: |
| 687 |
port = htons(sock->sk->sk_protocol); |
return 0; |
| 688 |
error = ccs_network_connect_acl(false, type, |
} |
| 689 |
(u8 *) &addr4->sin_addr, |
if (ccs_check_unix_address(addr, addr_len, &address.unix0)) |
| 690 |
port); |
error = ccs_unix_entry(&address); |
| 691 |
break; |
} else { |
| 692 |
} |
switch (type) { |
| 693 |
if (type != SOCK_STREAM) |
case SOCK_STREAM: |
| 694 |
return error; |
address.protocol = CCS_NETWORK_INET_TCP_PROTOCOL; |
| 695 |
switch (sock->sk->sk_family) { |
break; |
| 696 |
case PF_INET: |
case SOCK_DGRAM: |
| 697 |
case PF_INET6: |
address.protocol = CCS_NETWORK_INET_UDP_PROTOCOL; |
| 698 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CONNECT)) |
address.operation = CCS_NETWORK_SEND; |
| 699 |
error = -EPERM; |
break; |
| 700 |
break; |
case SOCK_RAW: |
| 701 |
|
address.protocol = CCS_NETWORK_INET_RAW_PROTOCOL; |
| 702 |
|
address.operation = CCS_NETWORK_SEND; |
| 703 |
|
break; |
| 704 |
|
default: |
| 705 |
|
return 0; |
| 706 |
|
} |
| 707 |
|
if (ccs_check_inet_address(addr, addr_len, &address.inet)) { |
| 708 |
|
if (type == SOCK_RAW) |
| 709 |
|
address.inet.port = htons(sock->sk->sk_protocol); |
| 710 |
|
error = ccs_inet_entry(&address); |
| 711 |
|
} |
| 712 |
} |
} |
| 713 |
return error; |
return error; |
| 714 |
} |
} |
| 715 |
|
|
| 716 |
/* Check permission for setting the local IP address/port pair of a socket. */ |
/* Check permission for setting the local address of a socket. */ |
| 717 |
static int __ccs_socket_bind_permission(struct socket *sock, |
static int __ccs_socket_bind_permission(struct socket *sock, |
| 718 |
struct sockaddr *addr, int addr_len) |
struct sockaddr *addr, int addr_len) |
| 719 |
{ |
{ |
| 720 |
int error = 0; |
int error = 0; |
| 721 |
const unsigned int type = sock->type; |
const unsigned int type = sock->type; |
| 722 |
/* Nothing to do if I am a kernel service. */ |
struct ccs_addr_info address; |
| 723 |
if (segment_eq(get_fs(), KERNEL_DS)) |
const u8 family = ccs_sock_family(sock); |
| 724 |
return 0; |
if (!family) |
| 725 |
switch (type) { |
return 0; |
| 726 |
case SOCK_STREAM: |
address.operation = CCS_NETWORK_BIND; |
| 727 |
case SOCK_DGRAM: |
if (family == 2) { |
| 728 |
case SOCK_RAW: |
switch (type) { |
| 729 |
break; |
case SOCK_STREAM: |
| 730 |
default: |
address.protocol = CCS_NETWORK_UNIX_STREAM_PROTOCOL; |
|
return 0; |
|
|
} |
|
|
switch (addr->sa_family) { |
|
|
struct sockaddr_in6 *addr6; |
|
|
struct sockaddr_in *addr4; |
|
|
u16 port; |
|
|
case AF_INET6: |
|
|
if (addr_len < SIN6_LEN_RFC2133) |
|
| 731 |
break; |
break; |
| 732 |
addr6 = (struct sockaddr_in6 *) addr; |
case SOCK_DGRAM: |
| 733 |
if (type != SOCK_RAW) |
address.protocol = CCS_NETWORK_UNIX_DGRAM_PROTOCOL; |
|
port = addr6->sin6_port; |
|
|
else |
|
|
port = htons(sock->sk->sk_protocol); |
|
|
error = ccs_network_bind_acl(true, type, |
|
|
addr6->sin6_addr.s6_addr, |
|
|
port); |
|
|
break; |
|
|
case AF_INET: |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
|
| 734 |
break; |
break; |
| 735 |
addr4 = (struct sockaddr_in *) addr; |
case SOCK_SEQPACKET: |
| 736 |
if (type != SOCK_RAW) |
address.protocol = CCS_NETWORK_UNIX_SEQPACKET_PROTOCOL; |
| 737 |
port = addr4->sin_port; |
break; |
| 738 |
else |
default: |
| 739 |
port = htons(sock->sk->sk_protocol); |
return 0; |
| 740 |
error = ccs_network_bind_acl(false, type, |
} |
| 741 |
(u8 *) &addr4->sin_addr, |
if (ccs_check_unix_address(addr, addr_len, &address.unix0)) |
| 742 |
port); |
error = ccs_unix_entry(&address); |
| 743 |
break; |
} else { |
| 744 |
} |
switch (type) { |
| 745 |
return error; |
case SOCK_STREAM: |
| 746 |
} |
address.protocol = CCS_NETWORK_INET_TCP_PROTOCOL; |
| 747 |
|
break; |
| 748 |
/* |
case SOCK_DGRAM: |
| 749 |
* Check permission for accepting a TCP socket. |
address.protocol = CCS_NETWORK_INET_UDP_PROTOCOL; |
| 750 |
* |
break; |
| 751 |
* Currently, the LSM hook for this purpose is not provided. |
case SOCK_RAW: |
| 752 |
*/ |
address.protocol = CCS_NETWORK_INET_RAW_PROTOCOL; |
| 753 |
static int __ccs_socket_accept_permission(struct socket *sock, |
break; |
| 754 |
struct sockaddr *addr) |
default: |
| 755 |
{ |
return 0; |
| 756 |
int error = 0; |
} |
| 757 |
int addr_len; |
if (ccs_check_inet_address(addr, addr_len, &address.inet)) { |
| 758 |
/* Nothing to do if I am a kernel service. */ |
if (type == SOCK_RAW) |
| 759 |
if (segment_eq(get_fs(), KERNEL_DS)) |
address.inet.port = htons(sock->sk->sk_protocol); |
| 760 |
return 0; |
error = ccs_inet_entry(&address); |
| 761 |
switch (sock->sk->sk_family) { |
} |
|
case PF_INET: |
|
|
case PF_INET6: |
|
|
break; |
|
|
default: |
|
|
return 0; |
|
|
} |
|
|
error = sock->ops->getname(sock, addr, &addr_len, 2); |
|
|
if (error) |
|
|
return error; |
|
|
switch (addr->sa_family) { |
|
|
struct sockaddr_in6 *addr6; |
|
|
struct sockaddr_in *addr4; |
|
|
case AF_INET6: |
|
|
addr6 = (struct sockaddr_in6 *) addr; |
|
|
error = ccs_network_accept_acl(true, |
|
|
addr6->sin6_addr.s6_addr, |
|
|
addr6->sin6_port); |
|
|
break; |
|
|
case AF_INET: |
|
|
addr4 = (struct sockaddr_in *) addr; |
|
|
error = ccs_network_accept_acl(false, |
|
|
(u8 *) &addr4->sin_addr, |
|
|
addr4->sin_port); |
|
|
break; |
|
| 762 |
} |
} |
| 763 |
return error; |
return error; |
| 764 |
} |
} |
| 767 |
static int __ccs_socket_sendmsg_permission(struct socket *sock, |
static int __ccs_socket_sendmsg_permission(struct socket *sock, |
| 768 |
struct msghdr *msg, int size) |
struct msghdr *msg, int size) |
| 769 |
{ |
{ |
|
struct sockaddr *addr = (struct sockaddr *) msg->msg_name; |
|
|
const int addr_len = msg->msg_namelen; |
|
| 770 |
int error = 0; |
int error = 0; |
| 771 |
const int type = sock->type; |
const int type = sock->type; |
| 772 |
/* Nothing to do if I am a kernel service. */ |
struct ccs_addr_info address; |
| 773 |
if (segment_eq(get_fs(), KERNEL_DS)) |
const u8 family = ccs_sock_family(sock); |
| 774 |
return 0; |
if (!msg->msg_name || !family) |
| 775 |
if (!addr || (type != SOCK_DGRAM && type != SOCK_RAW)) |
return 0; |
| 776 |
return 0; |
address.operation = CCS_NETWORK_SEND; |
| 777 |
switch (addr->sa_family) { |
if (family == 2) { |
| 778 |
struct sockaddr_in6 *addr6; |
if (type != SOCK_DGRAM) |
| 779 |
struct sockaddr_in *addr4; |
return 0; |
| 780 |
u16 port; |
address.protocol = CCS_NETWORK_UNIX_DGRAM_PROTOCOL; |
| 781 |
case AF_INET6: |
if (ccs_check_unix_address((struct sockaddr *) msg->msg_name, |
| 782 |
if (addr_len < SIN6_LEN_RFC2133) |
msg->msg_namelen, &address.unix0)) |
| 783 |
|
error = ccs_unix_entry(&address); |
| 784 |
|
} else { |
| 785 |
|
switch (type) { |
| 786 |
|
case SOCK_DGRAM: |
| 787 |
|
address.protocol = CCS_NETWORK_INET_UDP_PROTOCOL; |
| 788 |
break; |
break; |
| 789 |
addr6 = (struct sockaddr_in6 *) addr; |
case SOCK_RAW: |
| 790 |
if (type == SOCK_DGRAM) |
address.protocol = CCS_NETWORK_INET_RAW_PROTOCOL; |
|
port = addr6->sin6_port; |
|
|
else |
|
|
port = htons(sock->sk->sk_protocol); |
|
|
error = ccs_network_sendmsg_acl(true, type, |
|
|
addr6->sin6_addr.s6_addr, |
|
|
port); |
|
|
break; |
|
|
case AF_INET: |
|
|
if (addr_len < sizeof(struct sockaddr_in)) |
|
| 791 |
break; |
break; |
| 792 |
addr4 = (struct sockaddr_in *) addr; |
default: |
| 793 |
if (type == SOCK_DGRAM) |
return 0; |
| 794 |
port = addr4->sin_port; |
} |
| 795 |
|
if (ccs_check_inet_address((struct sockaddr *) msg->msg_name, |
| 796 |
|
msg->msg_namelen, &address.inet)) { |
| 797 |
|
if (type == SOCK_RAW) |
| 798 |
|
address.inet.port = htons(sock->sk->sk_protocol); |
| 799 |
|
error = ccs_inet_entry(&address); |
| 800 |
|
} |
| 801 |
|
} |
| 802 |
|
return error; |
| 803 |
|
} |
| 804 |
|
|
| 805 |
|
/* Check permission for accepting a socket. */ |
| 806 |
|
static int __ccs_socket_post_accept_permission(struct socket *sock, |
| 807 |
|
struct socket *newsock) |
| 808 |
|
{ |
| 809 |
|
struct sockaddr_storage addr; |
| 810 |
|
struct task_struct * const task = current; |
| 811 |
|
int error; |
| 812 |
|
int addr_len; |
| 813 |
|
const u8 family = ccs_sock_family(sock); |
| 814 |
|
struct ccs_addr_info address; |
| 815 |
|
const unsigned int type = sock->type; |
| 816 |
|
if (!family || (type != SOCK_STREAM && type != SOCK_SEQPACKET)) |
| 817 |
|
return 0; |
| 818 |
|
error = newsock->ops->getname(newsock, (struct sockaddr *) &addr, |
| 819 |
|
&addr_len, 2); |
| 820 |
|
if (error) |
| 821 |
|
return error; |
| 822 |
|
address.operation = CCS_NETWORK_ACCEPT; |
| 823 |
|
task->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 824 |
|
if (family == 2) { |
| 825 |
|
if (type == SOCK_STREAM) |
| 826 |
|
address.protocol = CCS_NETWORK_UNIX_STREAM_PROTOCOL; |
| 827 |
else |
else |
| 828 |
port = htons(sock->sk->sk_protocol); |
address.protocol = CCS_NETWORK_UNIX_SEQPACKET_PROTOCOL; |
| 829 |
error = ccs_network_sendmsg_acl(false, type, |
if (ccs_check_unix_address((struct sockaddr *) &addr, addr_len, |
| 830 |
(u8 *) &addr4->sin_addr, port); |
&address.unix0)) |
| 831 |
break; |
error = ccs_unix_entry(&address); |
| 832 |
|
} else { |
| 833 |
|
address.protocol = CCS_NETWORK_INET_TCP_PROTOCOL; |
| 834 |
|
if (ccs_check_inet_address((struct sockaddr *) &addr, addr_len, |
| 835 |
|
&address.inet)) |
| 836 |
|
error = ccs_inet_entry(&address); |
| 837 |
} |
} |
| 838 |
|
task->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 839 |
return error; |
return error; |
| 840 |
} |
} |
| 841 |
|
|
| 862 |
#endif |
#endif |
| 863 |
#endif |
#endif |
| 864 |
|
|
| 865 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 12) |
/* Check permission for receiving a datagram. */ |
| 866 |
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
static int __ccs_socket_post_recvmsg_permission(struct sock *sk, |
| 867 |
unsigned int flags) |
struct sk_buff *skb) |
|
{ |
|
|
/* Clear queue. */ |
|
|
if (flags & MSG_PEEK) { |
|
|
int clear = 0; |
|
|
spin_lock_irq(&sk->sk_receive_queue.lock); |
|
|
if (skb == skb_peek(&sk->sk_receive_queue)) { |
|
|
__skb_unlink(skb, &sk->sk_receive_queue); |
|
|
clear = 1; |
|
|
} |
|
|
spin_unlock_irq(&sk->sk_receive_queue.lock); |
|
|
if (clear) |
|
|
kfree_skb(skb); |
|
|
} |
|
|
skb_free_datagram(sk, skb); |
|
|
} |
|
|
#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16) |
|
|
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
|
|
unsigned int flags) |
|
|
{ |
|
|
/* Clear queue. */ |
|
|
if (flags & MSG_PEEK) { |
|
|
int clear = 0; |
|
|
spin_lock_bh(&sk->sk_receive_queue.lock); |
|
|
if (skb == skb_peek(&sk->sk_receive_queue)) { |
|
|
__skb_unlink(skb, &sk->sk_receive_queue); |
|
|
clear = 1; |
|
|
} |
|
|
spin_unlock_bh(&sk->sk_receive_queue.lock); |
|
|
if (clear) |
|
|
kfree_skb(skb); |
|
|
} |
|
|
skb_free_datagram(sk, skb); |
|
|
} |
|
|
#endif |
|
|
|
|
|
/* |
|
|
* Check permission for receiving a datagram via a UDP or RAW socket. |
|
|
* |
|
|
* Currently, the LSM hook for this purpose is not provided. |
|
|
*/ |
|
|
static int __ccs_socket_recvmsg_permission(struct sock *sk, |
|
|
struct sk_buff *skb, |
|
|
const unsigned int flags) |
|
| 868 |
{ |
{ |
| 869 |
|
struct task_struct * const task = current; |
| 870 |
int error = 0; |
int error = 0; |
| 871 |
const unsigned int type = sk->sk_type; |
const unsigned int type = sk->sk_type; |
| 872 |
if (type != SOCK_DGRAM && type != SOCK_RAW) |
struct ccs_addr_info address; |
| 873 |
|
union { |
| 874 |
|
struct in6_addr sin6; |
| 875 |
|
struct in_addr sin4; |
| 876 |
|
} ip_address; |
| 877 |
|
switch (type) { |
| 878 |
|
case SOCK_DGRAM: |
| 879 |
|
address.protocol = CCS_NETWORK_INET_UDP_PROTOCOL; |
| 880 |
|
break; |
| 881 |
|
case SOCK_RAW: |
| 882 |
|
address.protocol = CCS_NETWORK_INET_RAW_PROTOCOL; |
| 883 |
|
break; |
| 884 |
|
default: |
| 885 |
return 0; |
return 0; |
| 886 |
/* Nothing to do if I am a kernel service. */ |
} |
| 887 |
if (segment_eq(get_fs(), KERNEL_DS)) |
if (ccs_kernel_service()) |
| 888 |
return 0; |
return 0; |
|
|
|
| 889 |
switch (sk->sk_family) { |
switch (sk->sk_family) { |
|
struct in6_addr sin6; |
|
|
struct in_addr sin4; |
|
|
u16 port; |
|
| 890 |
case PF_INET6: |
case PF_INET6: |
| 891 |
if (type == SOCK_DGRAM) { /* UDP IPv6 */ |
address.inet.is_ipv6 = true; |
| 892 |
if (skb->protocol == htons(ETH_P_IP)) { |
if (type == SOCK_DGRAM && skb->protocol == htons(ETH_P_IP)) |
| 893 |
ipv6_addr_set(&sin6, 0, 0, htonl(0xffff), |
ipv6_addr_set(&ip_address.sin6, 0, 0, htonl(0xffff), |
| 894 |
ip_hdr(skb)->saddr); |
ip_hdr(skb)->saddr); |
| 895 |
} else { |
else |
| 896 |
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
ipv6_addr_copy(&ip_address.sin6, |
| 897 |
} |
&ipv6_hdr(skb)->saddr); |
|
port = udp_hdr(skb)->source; |
|
|
} else { /* RAW IPv6 */ |
|
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
|
|
port = htons(sk->sk_protocol); |
|
|
} |
|
|
error = ccs_network_recvmsg_acl(true, type, |
|
|
(u8 *) &sin6, port); |
|
| 898 |
break; |
break; |
| 899 |
case PF_INET: |
case PF_INET: |
| 900 |
if (type == SOCK_DGRAM) { /* UDP IPv4 */ |
address.inet.is_ipv6 = false; |
| 901 |
sin4.s_addr = ip_hdr(skb)->saddr; |
ip_address.sin4.s_addr = ip_hdr(skb)->saddr; |
|
port = udp_hdr(skb)->source; |
|
|
} else { /* RAW IPv4 */ |
|
|
sin4.s_addr = ip_hdr(skb)->saddr; |
|
|
port = htons(sk->sk_protocol); |
|
|
} |
|
|
error = ccs_network_recvmsg_acl(false, type, |
|
|
(u8 *) &sin4, port); |
|
| 902 |
break; |
break; |
| 903 |
|
default: |
| 904 |
|
goto skip; |
| 905 |
} |
} |
| 906 |
if (!error) |
address.inet.address = (u32 *) &ip_address; |
|
return 0; |
|
|
/* |
|
|
* Remove from queue if MSG_PEEK is used so that |
|
|
* the head message from unwanted source in receive queue will not |
|
|
* prevent the caller from picking up next message from wanted source |
|
|
* when the caller is using MSG_PEEK flag for picking up. |
|
|
*/ |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
|
|
if (type == SOCK_DGRAM) |
|
|
lock_sock(sk); |
|
|
#endif |
|
|
skb_kill_datagram(sk, skb, flags); |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
|
| 907 |
if (type == SOCK_DGRAM) |
if (type == SOCK_DGRAM) |
| 908 |
release_sock(sk); |
address.inet.port = udp_hdr(skb)->source; |
| 909 |
#endif |
else |
| 910 |
/* Hope less harmful than -EPERM. */ |
address.inet.port = htons(sk->sk_protocol); |
| 911 |
return -ENOMEM; |
address.operation = CCS_NETWORK_RECV; |
| 912 |
|
task->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 913 |
|
error = ccs_inet_entry(&address); |
| 914 |
|
task->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 915 |
|
skip: |
| 916 |
|
return error; |
| 917 |
} |
} |
| 918 |
|
|
| 919 |
void __init ccs_network_init(void) |
void __init ccs_network_init(void) |
| 925 |
ccsecurity_ops.socket_connect_permission = |
ccsecurity_ops.socket_connect_permission = |
| 926 |
__ccs_socket_connect_permission; |
__ccs_socket_connect_permission; |
| 927 |
ccsecurity_ops.socket_bind_permission = __ccs_socket_bind_permission; |
ccsecurity_ops.socket_bind_permission = __ccs_socket_bind_permission; |
| 928 |
ccsecurity_ops.socket_accept_permission = |
ccsecurity_ops.socket_post_accept_permission = |
| 929 |
__ccs_socket_accept_permission; |
__ccs_socket_post_accept_permission; |
| 930 |
ccsecurity_ops.socket_sendmsg_permission = |
ccsecurity_ops.socket_sendmsg_permission = |
| 931 |
__ccs_socket_sendmsg_permission; |
__ccs_socket_sendmsg_permission; |
| 932 |
ccsecurity_ops.socket_recvmsg_permission = |
ccsecurity_ops.socket_post_recvmsg_permission = |
| 933 |
__ccs_socket_recvmsg_permission; |
__ccs_socket_post_recvmsg_permission; |
| 934 |
} |
} |
| 935 |
|
|
| 936 |
|
#endif |
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