5 |
* |
* |
6 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
7 |
* |
* |
8 |
* Version: 1.6.6-pre 2008/12/24 |
* Version: 1.6.6-pre 2009/01/05 |
9 |
* |
* |
10 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
11 |
* See README.ccs for ChangeLog. |
* See README.ccs for ChangeLog. |
19 |
#include <linux/inet.h> |
#include <linux/inet.h> |
20 |
#include <linux/in.h> |
#include <linux/in.h> |
21 |
#include <linux/in6.h> |
#include <linux/in6.h> |
22 |
|
#include <net/ip.h> |
23 |
|
#include <net/ipv6.h> |
24 |
|
#include <net/udp.h> |
25 |
|
|
26 |
|
/* Index numbers for Network Controls. */ |
27 |
|
enum ccs_network_acl_index { |
28 |
|
NETWORK_ACL_UDP_BIND, |
29 |
|
NETWORK_ACL_UDP_CONNECT, |
30 |
|
NETWORK_ACL_TCP_BIND, |
31 |
|
NETWORK_ACL_TCP_LISTEN, |
32 |
|
NETWORK_ACL_TCP_CONNECT, |
33 |
|
NETWORK_ACL_TCP_ACCEPT, |
34 |
|
NETWORK_ACL_RAW_BIND, |
35 |
|
NETWORK_ACL_RAW_CONNECT |
36 |
|
}; |
37 |
|
|
38 |
/** |
/** |
39 |
* ccs_audit_network_log - Audit network log. |
* ccs_audit_network_log - Audit network log. |
785 |
* |
* |
786 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
787 |
*/ |
*/ |
788 |
int ccs_check_network_listen_acl(const _Bool is_ipv6, const u8 *address, |
static inline int ccs_check_network_listen_acl(const bool is_ipv6, |
789 |
const u16 port) |
const u8 *address, |
790 |
|
const u16 port) |
791 |
{ |
{ |
792 |
return ccs_check_network_entry(is_ipv6, NETWORK_ACL_TCP_LISTEN, |
return ccs_check_network_entry(is_ipv6, NETWORK_ACL_TCP_LISTEN, |
793 |
(const u32 *) address, ntohs(port)); |
(const u32 *) address, ntohs(port)); |
803 |
* |
* |
804 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
805 |
*/ |
*/ |
806 |
int ccs_check_network_connect_acl(const _Bool is_ipv6, const int sock_type, |
static inline int ccs_check_network_connect_acl(const bool is_ipv6, |
807 |
const u8 *address, const u16 port) |
const int sock_type, |
808 |
|
const u8 *address, |
809 |
|
const u16 port) |
810 |
{ |
{ |
811 |
u8 operation; |
u8 operation; |
812 |
switch (sock_type) { |
switch (sock_type) { |
833 |
* |
* |
834 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
835 |
*/ |
*/ |
836 |
int ccs_check_network_bind_acl(const _Bool is_ipv6, const int sock_type, |
static int ccs_check_network_bind_acl(const bool is_ipv6, const int sock_type, |
837 |
const u8 *address, const u16 port) |
const u8 *address, const u16 port) |
838 |
{ |
{ |
839 |
u8 operation; |
u8 operation; |
840 |
switch (sock_type) { |
switch (sock_type) { |
860 |
* |
* |
861 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
862 |
*/ |
*/ |
863 |
int ccs_check_network_accept_acl(const _Bool is_ipv6, const u8 *address, |
static inline int ccs_check_network_accept_acl(const bool is_ipv6, |
864 |
const u16 port) |
const u8 *address, |
865 |
|
const u16 port) |
866 |
{ |
{ |
867 |
int retval; |
int retval; |
868 |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
current->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
882 |
* |
* |
883 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
884 |
*/ |
*/ |
885 |
int ccs_check_network_sendmsg_acl(const _Bool is_ipv6, const int sock_type, |
static inline int ccs_check_network_sendmsg_acl(const bool is_ipv6, |
886 |
const u8 *address, const u16 port) |
const int sock_type, |
887 |
|
const u8 *address, |
888 |
|
const u16 port) |
889 |
{ |
{ |
890 |
u8 operation; |
u8 operation; |
891 |
if (sock_type == SOCK_DGRAM) |
if (sock_type == SOCK_DGRAM) |
906 |
* |
* |
907 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
908 |
*/ |
*/ |
909 |
int ccs_check_network_recvmsg_acl(const _Bool is_ipv6, const int sock_type, |
static inline int ccs_check_network_recvmsg_acl(const bool is_ipv6, |
910 |
const u8 *address, const u16 port) |
const int sock_type, |
911 |
|
const u8 *address, |
912 |
|
const u16 port) |
913 |
{ |
{ |
914 |
int retval; |
int retval; |
915 |
const u8 operation |
const u8 operation |
921 |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
current->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
922 |
return retval; |
return retval; |
923 |
} |
} |
924 |
|
|
925 |
|
#define MAX_SOCK_ADDR 128 /* net/socket.c */ |
926 |
|
|
927 |
|
/* Check permission for creating a socket. */ |
928 |
|
int ccs_socket_create_permission(int family, int type, int protocol) |
929 |
|
{ |
930 |
|
int error = 0; |
931 |
|
/* Nothing to do if I am a kernel service. */ |
932 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
933 |
|
return 0; |
934 |
|
if (family == PF_PACKET && !ccs_capable(TOMOYO_USE_PACKET_SOCKET)) |
935 |
|
return -EPERM; |
936 |
|
if (family == PF_ROUTE && !ccs_capable(TOMOYO_USE_ROUTE_SOCKET)) |
937 |
|
return -EPERM; |
938 |
|
if (family != PF_INET && family != PF_INET6) |
939 |
|
return 0; |
940 |
|
switch (type) { |
941 |
|
case SOCK_STREAM: |
942 |
|
if (!ccs_capable(TOMOYO_INET_STREAM_SOCKET_CREATE)) |
943 |
|
error = -EPERM; |
944 |
|
break; |
945 |
|
case SOCK_DGRAM: |
946 |
|
if (!ccs_capable(TOMOYO_USE_INET_DGRAM_SOCKET)) |
947 |
|
error = -EPERM; |
948 |
|
break; |
949 |
|
case SOCK_RAW: |
950 |
|
if (!ccs_capable(TOMOYO_USE_INET_RAW_SOCKET)) |
951 |
|
error = -EPERM; |
952 |
|
break; |
953 |
|
} |
954 |
|
return error; |
955 |
|
} |
956 |
|
|
957 |
|
/* Check permission for listening a TCP socket. */ |
958 |
|
int ccs_socket_listen_permission(struct socket *sock) |
959 |
|
{ |
960 |
|
int error = 0; |
961 |
|
char addr[MAX_SOCK_ADDR]; |
962 |
|
int addr_len; |
963 |
|
/* Nothing to do if I am a kernel service. */ |
964 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
965 |
|
return 0; |
966 |
|
if (sock->type != SOCK_STREAM) |
967 |
|
return 0; |
968 |
|
switch (sock->sk->sk_family) { |
969 |
|
case PF_INET: |
970 |
|
case PF_INET6: |
971 |
|
break; |
972 |
|
default: |
973 |
|
return 0; |
974 |
|
} |
975 |
|
if (!ccs_capable(TOMOYO_INET_STREAM_SOCKET_LISTEN)) |
976 |
|
return -EPERM; |
977 |
|
if (sock->ops->getname(sock, (struct sockaddr *) addr, &addr_len, 0)) |
978 |
|
return -EPERM; |
979 |
|
switch (((struct sockaddr *) addr)->sa_family) { |
980 |
|
struct sockaddr_in6 *addr6; |
981 |
|
struct sockaddr_in *addr4; |
982 |
|
case AF_INET6: |
983 |
|
addr6 = (struct sockaddr_in6 *) addr; |
984 |
|
error = ccs_check_network_listen_acl(true, |
985 |
|
addr6->sin6_addr.s6_addr, |
986 |
|
addr6->sin6_port); |
987 |
|
break; |
988 |
|
case AF_INET: |
989 |
|
addr4 = (struct sockaddr_in *) addr; |
990 |
|
error = ccs_check_network_listen_acl(false, |
991 |
|
(u8 *) &addr4->sin_addr, |
992 |
|
addr4->sin_port); |
993 |
|
break; |
994 |
|
} |
995 |
|
return error; |
996 |
|
} |
997 |
|
|
998 |
|
/* Check permission for setting the remote IP address/port pair of a socket. */ |
999 |
|
int ccs_socket_connect_permission(struct socket *sock, struct sockaddr *addr, |
1000 |
|
int addr_len) |
1001 |
|
{ |
1002 |
|
int error = 0; |
1003 |
|
const unsigned int type = sock->type; |
1004 |
|
/* Nothing to do if I am a kernel service. */ |
1005 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1006 |
|
return 0; |
1007 |
|
switch (type) { |
1008 |
|
case SOCK_STREAM: |
1009 |
|
case SOCK_DGRAM: |
1010 |
|
case SOCK_RAW: |
1011 |
|
break; |
1012 |
|
default: |
1013 |
|
return 0; |
1014 |
|
} |
1015 |
|
switch (addr->sa_family) { |
1016 |
|
struct sockaddr_in6 *addr6; |
1017 |
|
struct sockaddr_in *addr4; |
1018 |
|
u16 port; |
1019 |
|
case AF_INET6: |
1020 |
|
if (addr_len < SIN6_LEN_RFC2133) |
1021 |
|
break; |
1022 |
|
addr6 = (struct sockaddr_in6 *) addr; |
1023 |
|
if (type != SOCK_RAW) |
1024 |
|
port = addr6->sin6_port; |
1025 |
|
else |
1026 |
|
port = htons(sock->sk->sk_protocol); |
1027 |
|
error = ccs_check_network_connect_acl(true, type, |
1028 |
|
addr6->sin6_addr.s6_addr, |
1029 |
|
port); |
1030 |
|
break; |
1031 |
|
case AF_INET: |
1032 |
|
if (addr_len < sizeof(struct sockaddr_in)) |
1033 |
|
break; |
1034 |
|
addr4 = (struct sockaddr_in *) addr; |
1035 |
|
if (type != SOCK_RAW) |
1036 |
|
port = addr4->sin_port; |
1037 |
|
else |
1038 |
|
port = htons(sock->sk->sk_protocol); |
1039 |
|
error = ccs_check_network_connect_acl(false, type, |
1040 |
|
(u8 *) &addr4->sin_addr, |
1041 |
|
port); |
1042 |
|
break; |
1043 |
|
} |
1044 |
|
if (type != SOCK_STREAM) |
1045 |
|
return error; |
1046 |
|
switch (sock->sk->sk_family) { |
1047 |
|
case PF_INET: |
1048 |
|
case PF_INET6: |
1049 |
|
if (!ccs_capable(TOMOYO_INET_STREAM_SOCKET_CONNECT)) |
1050 |
|
error = -EPERM; |
1051 |
|
break; |
1052 |
|
} |
1053 |
|
return error; |
1054 |
|
} |
1055 |
|
|
1056 |
|
/* Check permission for setting the local IP address/port pair of a socket. */ |
1057 |
|
int ccs_socket_bind_permission(struct socket *sock, struct sockaddr *addr, |
1058 |
|
int addr_len) |
1059 |
|
{ |
1060 |
|
int error = 0; |
1061 |
|
const unsigned int type = sock->type; |
1062 |
|
/* Nothing to do if I am a kernel service. */ |
1063 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1064 |
|
return 0; |
1065 |
|
switch (type) { |
1066 |
|
case SOCK_STREAM: |
1067 |
|
case SOCK_DGRAM: |
1068 |
|
case SOCK_RAW: |
1069 |
|
break; |
1070 |
|
default: |
1071 |
|
return 0; |
1072 |
|
} |
1073 |
|
switch (addr->sa_family) { |
1074 |
|
struct sockaddr_in6 *addr6; |
1075 |
|
struct sockaddr_in *addr4; |
1076 |
|
u16 port; |
1077 |
|
case AF_INET6: |
1078 |
|
if (addr_len < SIN6_LEN_RFC2133) |
1079 |
|
break; |
1080 |
|
addr6 = (struct sockaddr_in6 *) addr; |
1081 |
|
if (type != SOCK_RAW) |
1082 |
|
port = addr6->sin6_port; |
1083 |
|
else |
1084 |
|
port = htons(sock->sk->sk_protocol); |
1085 |
|
error = ccs_check_network_bind_acl(true, type, |
1086 |
|
addr6->sin6_addr.s6_addr, |
1087 |
|
port); |
1088 |
|
break; |
1089 |
|
case AF_INET: |
1090 |
|
if (addr_len < sizeof(struct sockaddr_in)) |
1091 |
|
break; |
1092 |
|
addr4 = (struct sockaddr_in *) addr; |
1093 |
|
if (type != SOCK_RAW) |
1094 |
|
port = addr4->sin_port; |
1095 |
|
else |
1096 |
|
port = htons(sock->sk->sk_protocol); |
1097 |
|
error = ccs_check_network_bind_acl(false, type, |
1098 |
|
(u8 *) &addr4->sin_addr, |
1099 |
|
port); |
1100 |
|
break; |
1101 |
|
} |
1102 |
|
return error; |
1103 |
|
} |
1104 |
|
|
1105 |
|
/* |
1106 |
|
* Check permission for accepting a TCP socket. |
1107 |
|
* |
1108 |
|
* Currently, the LSM hook for this purpose is not provided. |
1109 |
|
*/ |
1110 |
|
int ccs_socket_accept_permission(struct socket *sock, struct sockaddr *addr) |
1111 |
|
{ |
1112 |
|
int error = 0; |
1113 |
|
int addr_len; |
1114 |
|
/* Nothing to do if I am a kernel service. */ |
1115 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1116 |
|
return 0; |
1117 |
|
switch (sock->sk->sk_family) { |
1118 |
|
case PF_INET: |
1119 |
|
case PF_INET6: |
1120 |
|
break; |
1121 |
|
default: |
1122 |
|
return 0; |
1123 |
|
} |
1124 |
|
error = sock->ops->getname(sock, addr, &addr_len, 2); |
1125 |
|
if (error) |
1126 |
|
return error; |
1127 |
|
switch (addr->sa_family) { |
1128 |
|
struct sockaddr_in6 *addr6; |
1129 |
|
struct sockaddr_in *addr4; |
1130 |
|
case AF_INET6: |
1131 |
|
addr6 = (struct sockaddr_in6 *) addr; |
1132 |
|
error = ccs_check_network_accept_acl(true, |
1133 |
|
addr6->sin6_addr.s6_addr, |
1134 |
|
addr6->sin6_port); |
1135 |
|
break; |
1136 |
|
case AF_INET: |
1137 |
|
addr4 = (struct sockaddr_in *) addr; |
1138 |
|
error = ccs_check_network_accept_acl(false, |
1139 |
|
(u8 *) &addr4->sin_addr, |
1140 |
|
addr4->sin_port); |
1141 |
|
break; |
1142 |
|
} |
1143 |
|
return error; |
1144 |
|
} |
1145 |
|
|
1146 |
|
/* Check permission for sending a datagram via a UDP or RAW socket. */ |
1147 |
|
int ccs_socket_sendmsg_permission(struct socket *sock, struct sockaddr *addr, |
1148 |
|
int addr_len) |
1149 |
|
{ |
1150 |
|
int error = 0; |
1151 |
|
const int type = sock->type; |
1152 |
|
/* Nothing to do if I am a kernel service. */ |
1153 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1154 |
|
return 0; |
1155 |
|
if (!addr || (type != SOCK_DGRAM && type != SOCK_RAW)) |
1156 |
|
return 0; |
1157 |
|
switch (addr->sa_family) { |
1158 |
|
struct sockaddr_in6 *addr6; |
1159 |
|
struct sockaddr_in *addr4; |
1160 |
|
u16 port; |
1161 |
|
case AF_INET6: |
1162 |
|
if (addr_len < SIN6_LEN_RFC2133) |
1163 |
|
break; |
1164 |
|
addr6 = (struct sockaddr_in6 *) addr; |
1165 |
|
if (type == SOCK_DGRAM) |
1166 |
|
port = addr6->sin6_port; |
1167 |
|
else |
1168 |
|
port = htons(sock->sk->sk_protocol); |
1169 |
|
error = ccs_check_network_sendmsg_acl(true, type, |
1170 |
|
addr6->sin6_addr.s6_addr, |
1171 |
|
port); |
1172 |
|
break; |
1173 |
|
case AF_INET: |
1174 |
|
if (addr_len < sizeof(struct sockaddr_in)) |
1175 |
|
break; |
1176 |
|
addr4 = (struct sockaddr_in *) addr; |
1177 |
|
if (type == SOCK_DGRAM) |
1178 |
|
port = addr4->sin_port; |
1179 |
|
else |
1180 |
|
port = htons(sock->sk->sk_protocol); |
1181 |
|
error = ccs_check_network_sendmsg_acl(false, type, |
1182 |
|
(u8 *) &addr4->sin_addr, |
1183 |
|
port); |
1184 |
|
break; |
1185 |
|
} |
1186 |
|
return error; |
1187 |
|
} |
1188 |
|
|
1189 |
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) |
1190 |
|
#if !defined(RHEL_MAJOR) || RHEL_MAJOR != 5 |
1191 |
|
|
1192 |
|
static inline struct iphdr *ip_hdr(const struct sk_buff *skb) |
1193 |
|
{ |
1194 |
|
return skb->nh.iph; |
1195 |
|
} |
1196 |
|
|
1197 |
|
static inline struct udphdr *udp_hdr(const struct sk_buff *skb) |
1198 |
|
{ |
1199 |
|
return skb->h.uh; |
1200 |
|
} |
1201 |
|
|
1202 |
|
static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) |
1203 |
|
{ |
1204 |
|
return skb->nh.ipv6h; |
1205 |
|
} |
1206 |
|
|
1207 |
|
#endif |
1208 |
|
#endif |
1209 |
|
|
1210 |
|
/* |
1211 |
|
* Check permission for receiving a datagram via a UDP or RAW socket. |
1212 |
|
* |
1213 |
|
* Currently, the LSM hook for this purpose is not provided. |
1214 |
|
*/ |
1215 |
|
int ccs_socket_recv_datagram_permission(struct sock *sk, struct sk_buff *skb, |
1216 |
|
const unsigned int flags) |
1217 |
|
{ |
1218 |
|
int error = 0; |
1219 |
|
const unsigned int type = sk->sk_type; |
1220 |
|
/* Nothing to do if I didn't receive a datagram. */ |
1221 |
|
if (!skb) |
1222 |
|
return 0; |
1223 |
|
/* Nothing to do if I can't sleep. */ |
1224 |
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) |
1225 |
|
if (in_interrupt()) |
1226 |
|
return 0; |
1227 |
|
#else |
1228 |
|
if (in_atomic()) |
1229 |
|
return 0; |
1230 |
|
#endif |
1231 |
|
/* Nothing to do if I am a kernel service. */ |
1232 |
|
if (segment_eq(get_fs(), KERNEL_DS)) |
1233 |
|
return 0; |
1234 |
|
if (type != SOCK_DGRAM && type != SOCK_RAW) |
1235 |
|
return 0; |
1236 |
|
|
1237 |
|
switch (sk->sk_family) { |
1238 |
|
struct in6_addr sin6; |
1239 |
|
struct in_addr sin4; |
1240 |
|
u16 port; |
1241 |
|
case PF_INET6: |
1242 |
|
if (type == SOCK_DGRAM) { /* UDP IPv6 */ |
1243 |
|
if (skb->protocol == htons(ETH_P_IP)) { |
1244 |
|
ipv6_addr_set(&sin6, 0, 0, htonl(0xffff), |
1245 |
|
ip_hdr(skb)->saddr); |
1246 |
|
} else { |
1247 |
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
1248 |
|
} |
1249 |
|
port = udp_hdr(skb)->source; |
1250 |
|
} else { /* RAW IPv6 */ |
1251 |
|
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
1252 |
|
port = htons(sk->sk_protocol); |
1253 |
|
} |
1254 |
|
error = ccs_check_network_recvmsg_acl(true, type, |
1255 |
|
(u8 *) &sin6, port); |
1256 |
|
break; |
1257 |
|
case PF_INET: |
1258 |
|
if (type == SOCK_DGRAM) { /* UDP IPv4 */ |
1259 |
|
sin4.s_addr = ip_hdr(skb)->saddr; |
1260 |
|
port = udp_hdr(skb)->source; |
1261 |
|
} else { /* RAW IPv4 */ |
1262 |
|
sin4.s_addr = ip_hdr(skb)->saddr; |
1263 |
|
port = htons(sk->sk_protocol); |
1264 |
|
} |
1265 |
|
error = ccs_check_network_recvmsg_acl(false, type, |
1266 |
|
(u8 *) &sin4, port); |
1267 |
|
break; |
1268 |
|
} |
1269 |
|
if (!error) |
1270 |
|
return 0; |
1271 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1272 |
|
lock_sock(sk); |
1273 |
|
#endif |
1274 |
|
/* |
1275 |
|
* Remove from queue if MSG_PEEK is used so that |
1276 |
|
* the head message from unwanted source in receive queue will not |
1277 |
|
* prevent the caller from picking up next message from wanted source |
1278 |
|
* when the caller is using MSG_PEEK flag for picking up. |
1279 |
|
*/ |
1280 |
|
if (flags & MSG_PEEK) { |
1281 |
|
unsigned long cpu_flags; |
1282 |
|
/***** CRITICAL SECTION START *****/ |
1283 |
|
spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags); |
1284 |
|
if (skb == skb_peek(&sk->sk_receive_queue)) { |
1285 |
|
__skb_unlink(skb, &sk->sk_receive_queue); |
1286 |
|
atomic_dec(&skb->users); |
1287 |
|
} |
1288 |
|
spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags); |
1289 |
|
/***** CRITICAL SECTION END *****/ |
1290 |
|
} |
1291 |
|
/* Drop reference count. */ |
1292 |
|
skb_free_datagram(sk, skb); |
1293 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1294 |
|
release_sock(sk); |
1295 |
|
#endif |
1296 |
|
/* Hope less harmful than -EPERM. */ |
1297 |
|
return -EAGAIN; |
1298 |
|
} |