/
ipsec.c
1121 lines (920 loc) · 38.4 KB
/
ipsec.c
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/*
* IMS IPSEC PCSCF module
*
* Copyright (C) 2018 Alexander Yosifov
* Copyright (C) 2018 Tsvetomir Dimitrov
*
* This file is part of Kamailio, a free SIP server.
*
* Kamailio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* Kamailio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "ipsec.h"
#include "spi_gen.h"
#include "../../core/dprint.h"
#include "../../core/mem/pkg.h"
#include "../../core/ip_addr.h"
#include "../../core/resolve.h"
#include "../ims_usrloc_pcscf/usrloc.h"
#include <errno.h>
#include <arpa/inet.h>
#include <libmnl/libmnl.h>
#include <linux/xfrm.h>
#include <time.h>
#define XFRM_TMPLS_BUF_SIZE 1024
#define NLMSG_BUF_SIZE 4096
#define NLMSG_DELETEALL_BUF_SIZE 8192
extern usrloc_api_t ul;
extern str ipsec_listen_addr;
extern str ipsec_listen_addr6;
extern ip_addr_t ipsec_listen_ip_addr;
extern ip_addr_t ipsec_listen_ip_addr6;
extern int xfrm_user_selector;
struct xfrm_buffer {
char buf[NLMSG_DELETEALL_BUF_SIZE];
int offset;
};
struct del_tunnels {
void *contacts;
struct xfrm_buffer delmsg_buf;
};
//
// This file contains all Linux specific IPSec code.
//
struct mnl_socket* init_mnl_socket()
{
struct mnl_socket* mnl_socket = mnl_socket_open(NETLINK_XFRM);
if(NULL == mnl_socket) {
LM_ERR("Error opening a MNL socket\n");
return NULL;
}
if(mnl_socket_bind(mnl_socket, 0, MNL_SOCKET_AUTOPID) < 0) {
LM_ERR("Error binding a MNL socket\n");
close_mnl_socket(mnl_socket);
return NULL;
}
return mnl_socket;
}
void close_mnl_socket(struct mnl_socket* sock)
{
if(mnl_socket_close(sock) != 0) {
LM_WARN("Error closing netlink socket\n");
}
}
static void string_to_key(char* dst, const str key_string)
{
int i = 0;
char *pos = key_string.s;
for (i = 0; i < key_string.len/2; i++) {
sscanf(pos, "%2hhx", &dst[i]);
pos += 2;
}
}
static uint choose_nlmsg_seq (void)
{
static double Tini=0;
struct timespec ts;
ksr_clock_gettime(&ts);
return(1000*(ts.tv_sec - Tini + (ts.tv_nsec * 1E-9))); // us
}
int add_sa(struct mnl_socket* nl_sock, const struct ip_addr *src_addr_param, const struct ip_addr *dest_addr_param, int s_port, int d_port, int long id, str ck, str ik, str r_alg, str r_ealg)
{
char l_msg_buf[MNL_SOCKET_BUFFER_SIZE];
char l_auth_algo_buf[XFRM_TMPLS_BUF_SIZE];
char l_enc_algo_buf[XFRM_TMPLS_BUF_SIZE];
struct nlmsghdr* l_nlh = NULL;
struct xfrm_usersa_info* l_xsainfo = NULL;
struct xfrm_algo* l_auth_algo = NULL;
struct xfrm_algo* l_enc_algo = NULL;
memset(l_msg_buf, 0, sizeof(l_msg_buf));
memset(l_auth_algo_buf, 0, sizeof(l_auth_algo_buf));
memset(l_enc_algo_buf, 0, sizeof(l_enc_algo_buf));
// nlmsghdr initialization
l_nlh = mnl_nlmsg_put_header(l_msg_buf);
l_nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
l_nlh->nlmsg_type = XFRM_MSG_NEWSA;
l_nlh->nlmsg_seq = choose_nlmsg_seq();
l_nlh->nlmsg_pid = id;
// add Security association
l_xsainfo = (struct xfrm_usersa_info*)mnl_nlmsg_put_extra_header(l_nlh, sizeof(struct xfrm_usersa_info));
l_xsainfo->sel.family = dest_addr_param->af;
if(dest_addr_param->af == AF_INET6) {
memcpy(l_xsainfo->sel.daddr.a6, dest_addr_param->u.addr32, sizeof(l_xsainfo->sel.daddr.a6));
memcpy(l_xsainfo->sel.saddr.a6, src_addr_param->u.addr32, sizeof(l_xsainfo->sel.saddr.a6));
l_xsainfo->sel.prefixlen_d = 128;
l_xsainfo->sel.prefixlen_s = 128;
}
else {
l_xsainfo->sel.daddr.a4 = dest_addr_param->u.addr32[0];
l_xsainfo->sel.saddr.a4 = src_addr_param->u.addr32[0];
l_xsainfo->sel.prefixlen_d = 32;
l_xsainfo->sel.prefixlen_s = 32;
}
l_xsainfo->sel.dport = htons(d_port);
l_xsainfo->sel.dport_mask = 0xFFFF;
l_xsainfo->sel.sport = htons(s_port);
l_xsainfo->sel.sport_mask = 0xFFFF;
l_xsainfo->sel.user = htonl(xfrm_user_selector);
if(dest_addr_param->af == AF_INET6) {
memcpy(l_xsainfo->id.daddr.a6, dest_addr_param->u.addr32, sizeof(l_xsainfo->id.daddr.a6));
memcpy(l_xsainfo->saddr.a6, src_addr_param->u.addr32, sizeof(l_xsainfo->saddr.a6));
}
else {
l_xsainfo->id.daddr.a4 = dest_addr_param->u.addr32[0];
l_xsainfo->saddr.a4 = src_addr_param->u.addr32[0];
}
l_xsainfo->id.spi = htonl(id);
l_xsainfo->id.proto = IPPROTO_ESP;
l_xsainfo->lft.soft_byte_limit = XFRM_INF;
l_xsainfo->lft.hard_byte_limit = XFRM_INF;
l_xsainfo->lft.soft_packet_limit = XFRM_INF;
l_xsainfo->lft.hard_packet_limit = XFRM_INF;
l_xsainfo->reqid = id;
l_xsainfo->family = dest_addr_param->af;
l_xsainfo->mode = XFRM_MODE_TRANSPORT;
l_xsainfo->replay_window = 32;
// Add authentication algorithm for this SA
// 3GPP TS 33.203 Annex I
// NOTE: hmac-md5-96 and des-ede3-cbc has been deprecated in Rel12+
// The cast below is performed because alg_key from struct xfrm_algo is char[0]
// The point is to provide a continuous chunk of memory with the key in it
l_auth_algo = (struct xfrm_algo *)l_auth_algo_buf;
// Set the proper algorithm by r_alg str
if(strncasecmp(r_alg.s, "hmac-md5-96", r_alg.len) == 0) {
strcpy(l_auth_algo->alg_name,"md5");
l_auth_algo->alg_key_len = ik.len * 4;
string_to_key(l_auth_algo->alg_key, ik);
} else if(strncasecmp(r_alg.s, "hmac-sha-1-96", r_alg.len) == 0) {
strcpy(l_auth_algo->alg_name,"sha1");
str ik1;
ik1.len = ik.len+8;
ik1.s = pkg_malloc (ik1.len+1);
if (ik1.s == NULL) {
LM_ERR("Error allocating memory\n");
return -1;
}
memcpy (ik1.s,ik.s,ik.len);
ik1.s[ik.len]=0;
strcat (ik1.s,"00000000");
l_auth_algo->alg_key_len = ik1.len * 4;
string_to_key(l_auth_algo->alg_key, ik1);
pkg_free(ik1.s);
} else {
LM_DBG("Creating security associations: UNKNOW Auth Algorithm\n");
return -1;
}
mnl_attr_put(l_nlh, XFRMA_ALG_AUTH, sizeof(struct xfrm_algo) + l_auth_algo->alg_key_len, l_auth_algo);
// add encription algorithm for this SA
l_enc_algo = (struct xfrm_algo *)l_enc_algo_buf;
// cipher_null, des, des3_ede, aes
if (strncasecmp(r_ealg.s,"aes-cbc",r_ealg.len) == 0) {
strcpy(l_enc_algo->alg_name,"aes");
l_enc_algo->alg_key_len = ck.len * 4;
string_to_key(l_enc_algo->alg_key, ck);
} else if (strncasecmp(r_ealg.s,"des-ede3-cbc",r_ealg.len) == 0) {
strcpy(l_enc_algo->alg_name,"des3_ede");
str ck1;
ck1.len = ck.len+ck.len/2;
ck1.s = pkg_malloc (ck1.len+1);
if (ck1.s == NULL) {
LM_ERR("Error allocating memory\n");
return -1;
}
memcpy (ck1.s,ck.s,ck.len);
memcpy (ck1.s+ck.len,ck.s,ck.len/2);
l_enc_algo->alg_key_len = ck1.len * 4;
string_to_key(l_enc_algo->alg_key, ck1);
pkg_free(ck1.s);
} else if (strncasecmp(r_ealg.s,"null",r_ealg.len) == 0) {
strcpy(l_enc_algo->alg_name,"cipher_null");
l_enc_algo->alg_key_len = 0;
} else {
LM_DBG("Creating security associations: UNKNOW Enc Algorithm\n");
return -1;
}
mnl_attr_put(l_nlh, XFRMA_ALG_CRYPT, sizeof(struct xfrm_algo) + l_enc_algo->alg_key_len, l_enc_algo);
// send it to Netlink socket
if(mnl_socket_sendto(nl_sock, l_nlh, l_nlh->nlmsg_len) < 0)
{
LM_ERR("Failed to send Netlink message for SA creation, error: %s\n", strerror(errno));
return -3;
}
return 0;
}
int remove_sa(struct mnl_socket* nl_sock, str src_addr_param, str dest_addr_param, int s_port, int d_port, int long id, unsigned int af)
{
char* src_addr = NULL;
char* dest_addr = NULL;
// convert input IP addresses to char*
if((src_addr = pkg_malloc(src_addr_param.len+1)) == NULL) {
LM_ERR("Error allocating memory for src addr during SA removal\n");
return -1;
}
if((dest_addr = pkg_malloc(dest_addr_param.len+1)) == NULL) {
pkg_free(src_addr);
LM_ERR("Error allocating memory for dest addr during SA removal\n");
return -2;
}
memset(src_addr, 0, src_addr_param.len+1);
memset(dest_addr, 0, dest_addr_param.len+1);
memcpy(src_addr, src_addr_param.s, src_addr_param.len);
memcpy(dest_addr, dest_addr_param.s, dest_addr_param.len);
struct {
struct nlmsghdr n;
struct xfrm_usersa_id xsid;
char buf[XFRM_TMPLS_BUF_SIZE];
} req = {
.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.xsid)),
.n.nlmsg_flags = NLM_F_REQUEST,
.n.nlmsg_type = XFRM_MSG_DELSA,
.n.nlmsg_pid = id,
.xsid.spi = htonl(id),
.xsid.family = af,
.xsid.proto = IPPROTO_ESP
};
xfrm_address_t saddr;
memset(&saddr, 0, sizeof(saddr));
if(af == AF_INET6){
ip_addr_t ip_addr;
if(str2ipxbuf(&dest_addr_param, &ip_addr) < 0){
LM_ERR("Unable to convert dest address [%.*s]\n", dest_addr_param.len, dest_addr_param.s);
pkg_free(src_addr);
pkg_free(dest_addr);
return -1;
}
memcpy(req.xsid.daddr.a6, ip_addr.u.addr32, sizeof(req.xsid.daddr.a6));
memset(&ip_addr, 0, sizeof(ip_addr_t));
if(str2ipxbuf(&src_addr_param, &ip_addr) < 0){
LM_ERR("Unable to convert src address [%.*s]\n", src_addr_param.len, src_addr_param.s);
pkg_free(src_addr);
pkg_free(dest_addr);
return -1;
}
memcpy(saddr.a6, ip_addr.u.addr32, sizeof(saddr.a6));
}else{
req.xsid.daddr.a4 = inet_addr(dest_addr);
saddr.a4 = inet_addr(src_addr);
}
mnl_attr_put(&req.n, XFRMA_SRCADDR, sizeof(saddr), (void *)&saddr);
if(mnl_socket_sendto(nl_sock, &req.n, req.n.nlmsg_len) < 0)
{
LM_ERR("Failed to send Netlink message, error: %s\n", strerror(errno));
pkg_free(src_addr);
pkg_free(dest_addr);
return -1;
}
pkg_free(src_addr);
pkg_free(dest_addr);
return 0;
}
int add_policy(struct mnl_socket* mnl_socket, const struct ip_addr *src_addr_param, const struct ip_addr *dest_addr_param, int src_port, int dst_port, int long p_id, enum ipsec_policy_direction dir)
{
char l_msg_buf[MNL_SOCKET_BUFFER_SIZE];
char l_tmpls_buf[XFRM_TMPLS_BUF_SIZE];
struct nlmsghdr* l_nlh;
struct xfrm_userpolicy_info* l_xpinfo;
memset(l_msg_buf, 0, sizeof(l_msg_buf));
memset(l_tmpls_buf, 0, sizeof(l_tmpls_buf));
// nlmsghdr initialization
l_nlh = mnl_nlmsg_put_header(l_msg_buf);
l_nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
l_nlh->nlmsg_type = XFRM_MSG_NEWPOLICY;
l_nlh->nlmsg_seq = time(NULL);
l_nlh->nlmsg_pid = p_id;
// add OUT policy
l_xpinfo = (struct xfrm_userpolicy_info*)mnl_nlmsg_put_extra_header(l_nlh, sizeof(struct xfrm_userpolicy_info));
l_xpinfo->sel.family = dest_addr_param->af;
if(dest_addr_param->af == AF_INET6) {
memcpy(l_xpinfo->sel.daddr.a6, dest_addr_param->u.addr32, sizeof(l_xpinfo->sel.daddr.a6));
memcpy(l_xpinfo->sel.saddr.a6, src_addr_param->u.addr32, sizeof(l_xpinfo->sel.saddr.a6));
l_xpinfo->sel.prefixlen_d = 128;
l_xpinfo->sel.prefixlen_s = 128;
}
else {
l_xpinfo->sel.daddr.a4 = dest_addr_param->u.addr32[0];
l_xpinfo->sel.saddr.a4 = src_addr_param->u.addr32[0];
l_xpinfo->sel.prefixlen_d = 32;
l_xpinfo->sel.prefixlen_s = 32;
}
l_xpinfo->sel.dport = htons(dst_port);
l_xpinfo->sel.dport_mask = 0xFFFF;
l_xpinfo->sel.sport = htons(src_port);
l_xpinfo->sel.sport_mask = 0xFFFF;
//l_xpinfo->sel.proto = sel_proto;
l_xpinfo->sel.user = htonl(xfrm_user_selector);
l_xpinfo->lft.soft_byte_limit = XFRM_INF;
l_xpinfo->lft.hard_byte_limit = XFRM_INF;
l_xpinfo->lft.soft_packet_limit = XFRM_INF;
l_xpinfo->lft.hard_packet_limit = XFRM_INF;
l_xpinfo->priority = 2080;
l_xpinfo->action = XFRM_POLICY_ALLOW;
l_xpinfo->share = XFRM_SHARE_ANY;
if (dir == IPSEC_POLICY_DIRECTION_IN) {
l_xpinfo->dir = XFRM_POLICY_IN;
}
else if(dir == IPSEC_POLICY_DIRECTION_OUT) {
l_xpinfo->dir = XFRM_POLICY_OUT;
}
else {
LM_ERR("Invalid direction parameter passed to add_policy: %d\n", dir);
return -3;
}
// xfrm_user_tmpl initialization
struct xfrm_user_tmpl* l_tmpl = (struct xfrm_user_tmpl*)l_tmpls_buf;
l_tmpl->id.proto = IPPROTO_ESP;
l_tmpl->family = dest_addr_param->af;
if(dest_addr_param->af == AF_INET6) {
memcpy(l_tmpl->id.daddr.a6, dest_addr_param->u.addr32, sizeof(l_tmpl->id.daddr.a6));
memcpy(l_tmpl->saddr.a6, src_addr_param->u.addr32, sizeof(l_tmpl->saddr.a6));
}
else {
l_tmpl->id.daddr.a4 = dest_addr_param->u.addr32[0];
l_tmpl->saddr.a4 = src_addr_param->u.addr32[0];
}
l_tmpl->reqid = p_id;
l_tmpl->mode = XFRM_MODE_TRANSPORT;
l_tmpl->aalgos = (~(__u32)0);
l_tmpl->ealgos = (~(__u32)0);
l_tmpl->calgos = (~(__u32)0);
mnl_attr_put(l_nlh, XFRMA_TMPL, sizeof(struct xfrm_user_tmpl), l_tmpl);
if(mnl_socket_sendto(mnl_socket, l_nlh, l_nlh->nlmsg_len) < 0)
{
LM_ERR("Failed to send Netlink message, error: %s\n", strerror(errno));
return -4;
}
return 0;
}
int remove_policy(struct mnl_socket* mnl_socket, str src_addr_param, str dest_addr_param, int src_port, int dst_port, int long p_id, unsigned int af, enum ipsec_policy_direction dir)
{
unsigned char policy_dir = 0;
if(dir == IPSEC_POLICY_DIRECTION_IN) {
policy_dir = XFRM_POLICY_IN;
}
else if(dir == IPSEC_POLICY_DIRECTION_OUT) {
policy_dir = XFRM_POLICY_OUT;
}
else {
LM_ERR("Invalid direction parameter passed to remove_policy: %d\n", dir);
return -1;
}
char* src_addr = NULL;
char* dest_addr = NULL;
// convert input IP addresses to char*
if((src_addr = pkg_malloc(src_addr_param.len+1)) == NULL) {
LM_ERR("Error allocating memory for src addr during SA removal\n");
return -1;
}
if((dest_addr = pkg_malloc(dest_addr_param.len+1)) == NULL) {
pkg_free(src_addr);
LM_ERR("Error allocating memory for dest addr during SA removal\n");
return -2;
}
memset(src_addr, 0, src_addr_param.len+1);
memset(dest_addr, 0, dest_addr_param.len+1);
memcpy(src_addr, src_addr_param.s, src_addr_param.len);
memcpy(dest_addr, dest_addr_param.s, dest_addr_param.len);
struct {
struct nlmsghdr n;
struct xfrm_userpolicy_id xpid;
char buf[XFRM_TMPLS_BUF_SIZE];
} req = {
.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.xpid)),
.n.nlmsg_flags = NLM_F_REQUEST,
.n.nlmsg_type = XFRM_MSG_DELPOLICY,
.n.nlmsg_pid = p_id,
.xpid.dir = policy_dir,
.xpid.sel.family = af,
.xpid.sel.dport = htons(dst_port),
.xpid.sel.dport_mask = 0xFFFF,
.xpid.sel.sport = htons(src_port),
.xpid.sel.sport_mask = 0xFFFF,
.xpid.sel.user = htonl(xfrm_user_selector)
//.xpid.sel.proto = sel_proto
};
if(af == AF_INET6){
ip_addr_t ip_addr;
if(str2ipxbuf(&dest_addr_param, &ip_addr) < 0){
LM_ERR("Unable to convert dest address [%.*s]\n", dest_addr_param.len, dest_addr_param.s);
pkg_free(src_addr);
pkg_free(dest_addr);
return -1;
}
memcpy(req.xpid.sel.daddr.a6, ip_addr.u.addr32, sizeof(req.xpid.sel.daddr.a6));
if(str2ipxbuf(&src_addr_param, &ip_addr) < 0){
LM_ERR("Unable to convert src address [%.*s]\n", src_addr_param.len, src_addr_param.s);
pkg_free(src_addr);
pkg_free(dest_addr);
return -1;
}
memcpy(req.xpid.sel.saddr.a6, ip_addr.u.addr32, sizeof(req.xpid.sel.saddr.a6));
req.xpid.sel.prefixlen_d = 128;
req.xpid.sel.prefixlen_s = 128;
}else{
req.xpid.sel.daddr.a4 = inet_addr(dest_addr);
req.xpid.sel.saddr.a4 = inet_addr(src_addr);
req.xpid.sel.prefixlen_d = 32;
req.xpid.sel.prefixlen_s = 32;
}
if(mnl_socket_sendto(mnl_socket, &req.n, req.n.nlmsg_len) < 0)
{
LM_ERR("Failed to send Netlink message, error: %s\n", strerror(errno));
pkg_free(src_addr);
pkg_free(dest_addr);
return -1;
}
pkg_free(src_addr);
pkg_free(dest_addr);
return 0;
}
static int delsa_data_cb(const struct nlmsghdr *nlh, void *data)
{
struct xfrm_usersa_info *xsinfo = NLMSG_DATA(nlh);
int xfrm_userid = ntohl(xsinfo->sel.user);
//Check if user id is different from Kamailio's
if(xfrm_userid != xfrm_user_selector)
return MNL_CB_OK;
struct xfrm_buffer* delmsg_buf = (struct xfrm_buffer*)data;
uint32_t new_delmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
if(delmsg_buf->offset + new_delmsg_len > sizeof(delmsg_buf->buf)/sizeof(delmsg_buf->buf[0])) {
LM_ERR("Not enough memory allocated for delete SAs netlink command\n");
return MNL_CB_ERROR;
}
struct nlmsghdr *new_delmsg = (struct nlmsghdr *)&delmsg_buf->buf[delmsg_buf->offset];
new_delmsg->nlmsg_len = new_delmsg_len;
new_delmsg->nlmsg_flags = NLM_F_REQUEST;
new_delmsg->nlmsg_type = XFRM_MSG_DELSA;
new_delmsg->nlmsg_seq = time(NULL);
struct xfrm_usersa_id *xsid = NLMSG_DATA(new_delmsg);
xsid->family = xsinfo->family;
memcpy(&xsid->daddr, &xsinfo->id.daddr, sizeof(xsid->daddr));
xsid->spi = xsinfo->id.spi;
xsid->proto = xsinfo->id.proto;
mnl_attr_put(new_delmsg, XFRMA_SRCADDR, sizeof(xsid->daddr), &xsinfo->saddr);
delmsg_buf->offset += new_delmsg->nlmsg_len;
return MNL_CB_OK;
}
static int delpolicy_data_cb(const struct nlmsghdr *nlh, void *data)
{
struct xfrm_userpolicy_info *xpinfo = NLMSG_DATA(nlh);
int xfrm_userid = ntohl(xpinfo->sel.user);
//Check if user id is different from Kamailio's
if(xfrm_userid != xfrm_user_selector)
return MNL_CB_OK;
struct xfrm_buffer* delmsg_buf = (struct xfrm_buffer*)data;
uint32_t new_delmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
if(delmsg_buf->offset + new_delmsg_len > sizeof(delmsg_buf->buf)/sizeof(delmsg_buf->buf[0])) {
LM_ERR("Not enough memory allocated for delete policies netlink command\n");
return MNL_CB_ERROR;
}
struct nlmsghdr *new_delmsg = (struct nlmsghdr *)&delmsg_buf->buf[delmsg_buf->offset];
new_delmsg->nlmsg_len = new_delmsg_len;
new_delmsg->nlmsg_flags = NLM_F_REQUEST;
new_delmsg->nlmsg_type = XFRM_MSG_DELPOLICY;
new_delmsg->nlmsg_seq = time(NULL);
struct xfrm_userpolicy_id *xpid = NLMSG_DATA(new_delmsg);
memcpy(&xpid->sel, &xpinfo->sel, sizeof(xpid->sel));
xpid->dir = xpinfo->dir;
xpid->index = xpinfo->index;
delmsg_buf->offset += new_delmsg->nlmsg_len;
return MNL_CB_OK;
}
int clean_sa(struct mnl_socket* mnl_socket)
{
struct {
struct nlmsghdr n;
//char buf[NLMSG_DELETEALL_BUF_SIZE];
} req = {
.n.nlmsg_len = NLMSG_HDRLEN,
.n.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.n.nlmsg_type = XFRM_MSG_GETSA,
.n.nlmsg_seq = time(NULL),
};
if(mnl_socket_sendto(mnl_socket, &req, req.n.nlmsg_len) == -1) {
LM_ERR("Error sending get all SAs command via netlink socket: %s\n", strerror(errno));
return 1;
}
char buf[NLMSG_DELETEALL_BUF_SIZE];
memset(&buf, 0, sizeof(buf));
struct xfrm_buffer delmsg_buf;
memset(&delmsg_buf, 0, sizeof(struct xfrm_buffer));
int ret = mnl_socket_recvfrom(mnl_socket, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, req.n.nlmsg_seq, mnl_socket_get_portid(mnl_socket), delsa_data_cb, &delmsg_buf);
if (ret <= MNL_CB_STOP) {
break;
}
ret = mnl_socket_recvfrom(mnl_socket, buf, sizeof(buf));
}
// DELETE SAs
if(mnl_socket_sendto(mnl_socket, &delmsg_buf.buf, delmsg_buf.offset) == -1) {
LM_ERR("Error sending delete SAs command via netlink socket: %s\n", strerror(errno));
return 1;
}
return 0;
}
int clean_policy(struct mnl_socket* mnl_socket)
{
struct {
struct nlmsghdr n;
//char buf[NLMSG_DELETEALL_BUF_SIZE];
} req = {
.n.nlmsg_len = NLMSG_HDRLEN,
.n.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.n.nlmsg_type = XFRM_MSG_GETPOLICY,
.n.nlmsg_seq = time(NULL),
};
if(mnl_socket_sendto(mnl_socket, &req, req.n.nlmsg_len) == -1) {
LM_ERR("Error sending get all policies command via netlink socket: %s\n", strerror(errno));
return 1;
}
char buf[NLMSG_DELETEALL_BUF_SIZE];
memset(&buf, 0, sizeof(buf));
struct xfrm_buffer delmsg_buf;
memset(&delmsg_buf, 0, sizeof(struct xfrm_buffer));
int ret = mnl_socket_recvfrom(mnl_socket, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, req.n.nlmsg_seq, mnl_socket_get_portid(mnl_socket), delpolicy_data_cb, &delmsg_buf);
if (ret <= MNL_CB_STOP) {
break;
}
ret = mnl_socket_recvfrom(mnl_socket, buf, sizeof(buf));
}
// DELETE POLICIES
if(mnl_socket_sendto(mnl_socket, &delmsg_buf.buf, delmsg_buf.offset) == -1) {
LM_ERR("Error sending delete policies command via netlink socket: %s\n", strerror(errno));
return 1;
}
return 0;
}
static int delete_unused_sa_cb(const struct nlmsghdr *nlh, void *data)
{
struct xfrm_usersa_info *xsinfo = NLMSG_DATA(nlh);
// Check if user id is different from Kamailio's
if (ntohl(xsinfo->sel.user) != xfrm_user_selector) {
return MNL_CB_OK;
}
ip_addr_t sa_src_addr, sa_dst_addr;
unsigned int sa_spi;
unsigned short sa_sport, sa_dport;
ip_addr_t *proxy_ip_addr = NULL;
sa_src_addr.af = sa_dst_addr.af = xsinfo->sel.family;
if(xsinfo->sel.family == AF_INET6) {
memcpy(sa_src_addr.u.addr32, xsinfo->sel.saddr.a6, sizeof(xsinfo->sel.saddr.a6));
memcpy(sa_dst_addr.u.addr32, xsinfo->sel.daddr.a6, sizeof(xsinfo->sel.daddr.a6));
sa_src_addr.len = sa_dst_addr.len = 16;
proxy_ip_addr = &ipsec_listen_ip_addr6;
} else if(xsinfo->sel.family == AF_INET) {
sa_src_addr.u.addr32[0] = xsinfo->sel.saddr.a4;
sa_dst_addr.u.addr32[0] = xsinfo->sel.daddr.a4;
sa_src_addr.len = sa_dst_addr.len = 4;
proxy_ip_addr = &ipsec_listen_ip_addr;
} else {
LM_CRIT("Unknown AF %d\n", xsinfo->sel.family);
return MNL_CB_OK;
}
sa_spi = htonl(xsinfo->id.spi);
sa_sport = htons(xsinfo->sel.sport);
sa_dport = htons(xsinfo->sel.dport);
char saddr_buf[IP_ADDR_MAX_STRZ_SIZE];
char daddr_buf[IP_ADDR_MAX_STRZ_SIZE];
memset(saddr_buf, 0, IP_ADDR_MAX_STRZ_SIZE);
memset(daddr_buf, 0, IP_ADDR_MAX_STRZ_SIZE);
ip_addr2sbufz(&sa_src_addr, saddr_buf, IP_ADDR_MAX_STRZ_SIZE);
ip_addr2sbufz(&sa_dst_addr, daddr_buf, IP_ADDR_MAX_STRZ_SIZE);
// * +-----------------+---------------+------+------+------+------+-------+-------+-------+-------+
// * |received host.len|received host.s|spi_uc|spi_us|spi_pc|spi_ps|port_uc|port_us|port_pc|port_ps|
// * +-----------------+---------------+------+------+------+------+-------+-------+-------+-------+
// * |received host.len|received host.s|spi_uc|spi_us|spi_pc|spi_ps|port_uc|port_us|port_pc|port_ps|
// * +-----------------+---------------+------+------+------+------+-------+-------+-------+-------+
// * |.............................................................................................|
// * +-----------------+---------------+------+------+------+------+-------+-------+-------+-------+
// * |0000|
// * +----+
void *cp;
str received_host;
ip_addr_t received_host_addr;
ipsec_t ipsec = {0};
cp = ((struct del_tunnels*)data)->contacts;
while (1) {
memcpy(&(received_host.len), cp, sizeof(received_host.len));
if (received_host.len == 0) {
break; // no more records
}
received_host.s = (char*)cp + sizeof(received_host.len);
cp = (char*)cp + sizeof(received_host.len) + received_host.len;
memcpy(&ipsec.spi_uc, cp, sizeof(ipsec.spi_uc));
cp = (char*)cp + sizeof(ipsec.spi_uc);
memcpy(&ipsec.spi_us, cp, sizeof(ipsec.spi_us));
cp = (char*)cp + sizeof(ipsec.spi_us);
memcpy(&ipsec.spi_pc, cp, sizeof(ipsec.spi_pc));
cp = (char*)cp + sizeof(ipsec.spi_pc);
memcpy(&ipsec.spi_ps, cp, sizeof(ipsec.spi_ps));
cp = (char*)cp + sizeof(ipsec.spi_ps);
memcpy(&ipsec.port_uc, cp, sizeof(ipsec.port_uc));
cp = (char*)cp + sizeof(ipsec.port_uc);
memcpy(&ipsec.port_us, cp, sizeof(ipsec.port_us));
cp = (char*)cp + sizeof(ipsec.port_us);
memcpy(&ipsec.port_pc, cp, sizeof(ipsec.port_pc));
cp = (char*)cp + sizeof(ipsec.port_pc);
memcpy(&ipsec.port_ps, cp, sizeof(ipsec.port_ps));
cp = (char*)cp + sizeof(ipsec.port_ps);
// convert 'received host' ip string to ip_addr_t
if (str2ipxbuf(&received_host, &received_host_addr) < 0){
LM_ERR("Unable to convert received host [%.*s]\n", received_host.len, received_host.s);
return 1;
}
// SA Src address Dst address Src port Dst port SPI
// SA1 UE-IP Proxy-IP UE-Server Proxy-Client Proxy-Client
// SA2 UE-IP Proxy-IP UE-Client Proxy-Server Proxy-Server
// SA3 Proxy-IP UE-IP P-Server UE-Client UE-Client
// SA4 Proxy-IP UE-IP P-Client UE-Server UE-Server
// Check for SA1 or SA2
if(ip_addr_cmp(&sa_src_addr, &received_host_addr) && ip_addr_cmp(&sa_dst_addr, proxy_ip_addr)) {
// check for SA1
if(sa_sport == ipsec.port_us && sa_dport == ipsec.port_pc && sa_spi == ipsec.spi_pc){
return MNL_CB_OK;
}
// check for SA2
if(sa_sport == ipsec.port_uc && sa_dport == ipsec.port_ps && sa_spi == ipsec.spi_ps){
return MNL_CB_OK;
}
}
// Check for SA3 or SA4
if(ip_addr_cmp(&sa_src_addr, proxy_ip_addr) && ip_addr_cmp(&sa_dst_addr, &received_host_addr)) {
// check for SA3
if(sa_sport == ipsec.port_ps && sa_dport == ipsec.port_uc && sa_spi == ipsec.spi_uc){
return MNL_CB_OK;
}
// check for SA4
if(sa_sport == ipsec.port_pc && sa_dport == ipsec.port_us && sa_spi == ipsec.spi_us){
return MNL_CB_OK;
}
}
}
LM_DBG("The SA is not used and will be deleted: spi:%u | saddr:%s:%u | daddr:%s:%u\n", sa_spi, saddr_buf, sa_sport, daddr_buf, sa_dport);
struct xfrm_buffer* delmsg_buf = &((struct del_tunnels*)data)->delmsg_buf;
uint32_t new_delmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
if(delmsg_buf->offset + new_delmsg_len > sizeof(delmsg_buf->buf)/sizeof(delmsg_buf->buf[0])) {
LM_ERR("Not enough memory allocated for delete SAs netlink command\n");
return MNL_CB_ERROR;
}
struct nlmsghdr *new_delmsg = (struct nlmsghdr *)&delmsg_buf->buf[delmsg_buf->offset];
new_delmsg->nlmsg_len = new_delmsg_len;
new_delmsg->nlmsg_flags = NLM_F_REQUEST;
new_delmsg->nlmsg_type = XFRM_MSG_DELSA;
new_delmsg->nlmsg_seq = time(NULL);
struct xfrm_usersa_id *xsid = NLMSG_DATA(new_delmsg);
xsid->family = xsinfo->family;
memcpy(&xsid->daddr, &xsinfo->id.daddr, sizeof(xsid->daddr));
xsid->spi = xsinfo->id.spi;
xsid->proto = xsinfo->id.proto;
mnl_attr_put(new_delmsg, XFRMA_SRCADDR, sizeof(xsid->daddr), &xsinfo->saddr);
delmsg_buf->offset += new_delmsg->nlmsg_len;
// NOTE: Release the Proxy SPIs and Ports only here. Do not release the same SPIs and ports in delete unsused policy callback.
// Release SPIs
release_spi(ipsec.spi_pc, ipsec.spi_ps, ipsec.port_pc, ipsec.port_ps);
return MNL_CB_OK;
}
static int delete_unused_sa(struct mnl_socket *mnl_socket, void *contacts)
{
struct {
struct nlmsghdr n;
//char buf[NLMSG_DELETEALL_BUF_SIZE];
} req = {
.n.nlmsg_len = NLMSG_HDRLEN,
.n.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.n.nlmsg_type = XFRM_MSG_GETSA,
.n.nlmsg_seq = time(NULL),
};
if(mnl_socket_sendto(mnl_socket, &req, req.n.nlmsg_len) == -1) {
LM_ERR("Error sending get all SAs command via netlink socket: %s\n", strerror(errno));
return 1;
}
char buf[NLMSG_DELETEALL_BUF_SIZE];
memset(&buf, 0, sizeof(buf));
struct del_tunnels del_data;
del_data.contacts = contacts;
memset(&del_data.delmsg_buf, 0, sizeof(del_data.delmsg_buf));
int ret = mnl_socket_recvfrom(mnl_socket, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, req.n.nlmsg_seq, mnl_socket_get_portid(mnl_socket), delete_unused_sa_cb, &del_data);
if (ret <= MNL_CB_STOP) {
break;
}
ret = mnl_socket_recvfrom(mnl_socket, buf, sizeof(buf));
}
// DELETE unused SAs
if(mnl_socket_sendto(mnl_socket, &del_data.delmsg_buf.buf, del_data.delmsg_buf.offset) == -1) {
LM_ERR("Error sending delete unused SAs command via netlink socket: %s\n", strerror(errno));
return 1;
}
return 0;
}
static int delete_unused_policy_cb(const struct nlmsghdr *nlh, void *data)
{
struct xfrm_userpolicy_info *xpinfo = NLMSG_DATA(nlh);
//Check if user id is different from Kamailio's
if (ntohl(xpinfo->sel.user) != xfrm_user_selector) {
return MNL_CB_OK;
}
ip_addr_t sa_src_addr, sa_dst_addr;
unsigned short sa_sport, sa_dport;
ip_addr_t *proxy_ip_addr = NULL;
sa_src_addr.af = sa_dst_addr.af = xpinfo->sel.family;
if(xpinfo->sel.family == AF_INET6) {
memcpy(sa_src_addr.u.addr32, xpinfo->sel.saddr.a6, sizeof(xpinfo->sel.saddr.a6));
memcpy(sa_dst_addr.u.addr32, xpinfo->sel.daddr.a6, sizeof(xpinfo->sel.daddr.a6));
sa_src_addr.len = sa_dst_addr.len = 16;
proxy_ip_addr = &ipsec_listen_ip_addr6;
} else if(xpinfo->sel.family == AF_INET) {
sa_src_addr.u.addr32[0] = xpinfo->sel.saddr.a4;
sa_dst_addr.u.addr32[0] = xpinfo->sel.daddr.a4;
sa_src_addr.len = sa_dst_addr.len = 4;
proxy_ip_addr = &ipsec_listen_ip_addr;
} else {
LM_CRIT("Unknown AF %d\n", xpinfo->sel.family);
return MNL_CB_OK;
}
sa_sport = htons(xpinfo->sel.sport);
sa_dport = htons(xpinfo->sel.dport);
char saddr_buf[IP_ADDR_MAX_STRZ_SIZE];
char daddr_buf[IP_ADDR_MAX_STRZ_SIZE];
memset(saddr_buf, 0, IP_ADDR_MAX_STRZ_SIZE);
memset(daddr_buf, 0, IP_ADDR_MAX_STRZ_SIZE);
ip_addr2sbufz(&sa_src_addr, saddr_buf, IP_ADDR_MAX_STRZ_SIZE);
ip_addr2sbufz(&sa_dst_addr, daddr_buf, IP_ADDR_MAX_STRZ_SIZE);
// * +-----------------+---------------+------+------+------+------+-------+-------+-------+-------+
// * |received host.len|received host.s|spi_uc|spi_us|spi_pc|spi_ps|port_uc|port_us|port_pc|port_ps|
// * +-----------------+---------------+------+------+------+------+-------+-------+-------+-------+
// * |received host.len|received host.s|spi_uc|spi_us|spi_pc|spi_ps|port_uc|port_us|port_pc|port_ps|
// * +-----------------+---------------+------+------+------+------+-------+-------+-------+-------+
// * |.............................................................................................|
// * +-----------------+---------------+------+------+------+------+-------+-------+-------+-------+
// * |0000|
// * +----+
void *cp;
str received_host;
ip_addr_t received_host_addr;
ipsec_t ipsec;
cp = ((struct del_tunnels*)data)->contacts;
while (1) {
memcpy(&(received_host.len), cp, sizeof(received_host.len));
if (received_host.len == 0) {
break; // no more records
}
received_host.s = (char*)cp + sizeof(received_host.len);
cp = (char*)cp + sizeof(received_host.len) + received_host.len;
memcpy(&ipsec.spi_uc, cp, sizeof(ipsec.spi_uc));
cp = (char*)cp + sizeof(ipsec.spi_uc);
memcpy(&ipsec.spi_us, cp, sizeof(ipsec.spi_us));
cp = (char*)cp + sizeof(ipsec.spi_us);
memcpy(&ipsec.spi_pc, cp, sizeof(ipsec.spi_pc));
cp = (char*)cp + sizeof(ipsec.spi_pc);
memcpy(&ipsec.spi_ps, cp, sizeof(ipsec.spi_ps));
cp = (char*)cp + sizeof(ipsec.spi_ps);
memcpy(&ipsec.port_uc, cp, sizeof(ipsec.port_uc));
cp = (char*)cp + sizeof(ipsec.port_uc);
memcpy(&ipsec.port_us, cp, sizeof(ipsec.port_us));
cp = (char*)cp + sizeof(ipsec.port_us);
memcpy(&ipsec.port_pc, cp, sizeof(ipsec.port_pc));
cp = (char*)cp + sizeof(ipsec.port_pc);
memcpy(&ipsec.port_ps, cp, sizeof(ipsec.port_ps));
cp = (char*)cp + sizeof(ipsec.port_ps);
// convert 'received host' ip string to ip_addr_t
if (str2ipxbuf(&received_host, &received_host_addr) < 0){
LM_ERR("Unable to convert received host [%.*s]\n", received_host.len, received_host.s);
return 1;
}
// Policy Src address Dst address Src port Dst port
// Policy1 UE-IP Proxy-IP UE-Server Proxy-Client
// Policy2 UE-IP Proxy-IP UE-Client Proxy-Server
// Policy3 Proxy-IP UE-IP P-Server UE-Client
// Policy4 Proxy-IP UE-IP P-Client UE-Server
// Check for Policy1 or Policy2
if(ip_addr_cmp(&sa_src_addr, &received_host_addr) && ip_addr_cmp(&sa_dst_addr, proxy_ip_addr)) {
// check for SA1
if(sa_sport == ipsec.port_us && sa_dport == ipsec.port_pc){
return MNL_CB_OK;
}
// check for SA2
if(sa_sport == ipsec.port_uc && sa_dport == ipsec.port_ps){
return MNL_CB_OK;
}
}
// Check for Policy3 or Policy4
if(ip_addr_cmp(&sa_src_addr, proxy_ip_addr) && ip_addr_cmp(&sa_dst_addr, &received_host_addr)) {
// check for SA3
if(sa_sport == ipsec.port_ps && sa_dport == ipsec.port_uc){
return MNL_CB_OK;
}
// check for SA4