/**
* Looks for the UE Via in First Via header if its a request
* or in the last if its a response and returns its body
* @param msg - the SIP message
* @returns the via of the UE
*/
struct via_body* cscf_get_ue_via(struct sip_msg *msg)
{
struct via_body *vb=0;
if (msg->first_line.type==SIP_REQUEST) vb = cscf_get_first_via(msg,0);
else vb = cscf_get_last_via(msg);
if (!vb) return 0;
if (vb->port == 0) vb->port=5060;
return vb;
}
/**
* Process the REGISTER and verify Client-Security.
* @param req - Register request
* @param str1 - not used
* @param str2 - not used
* @returns 1 if ok, 0 if not
*/
int P_verify_security(struct sip_msg *req,char *str1, char *str2)
{
str sec_hdr;
struct hdr_field *h;
struct via_body *vb;
r_contact *c;
r_security *s;
r_security_type sec_type;
float sec_q;
str ealg,alg,tmp;
unsigned int spi_pc,spi_ps;;
int port_pc,port_ps;
vb = cscf_get_first_via(req,&h);
LOG(L_INFO,"DBG:"M_NAME":P_verify_security: Looking for <%d://%.*s:%d> \n", vb->proto,vb->host.len,vb->host.s,vb->port);
c = get_r_contact(vb->host,vb->port,vb->proto);
r_act_time();
if (!c){
//first register
LOG(L_DBG,"DBG:"M_NAME":P_verify_security: No Contact found ! \n");
return CSCF_RETURN_TRUE;
}
if (!r_valid_contact(c) || !c->security_temp){
LOG(L_DBG,"DBG:"M_NAME":P_verify_security: No security temp !.\n");
r_unlock(c->hash);
return CSCF_RETURN_TRUE;
}
sec_hdr = cscf_get_pref_security_header(req,s_security_verify, &sec_type,&sec_q);
if (!sec_hdr.len)
{
LOG(L_DBG,"DBG:"M_NAME":P_verify_security: No Security-Verify header found.\n");
r_unlock(c->hash);
return CSCF_RETURN_TRUE;
}
s = c->security_temp;
switch (s->type)
{
case SEC_NONE:
break;
case SEC_TLS:
if (sec_type != SEC_TLS || req->rcv.dst_port != pcscf_tls_port)
goto error;
break;
case SEC_IPSEC:
if (sec_type != SEC_IPSEC || req->rcv.dst_port != pcscf_ipsec_port_s)
{
LOG(L_INFO,"DBG:"M_NAME":P_verify_security: Not IPSEC tunnel!.\n");
r_unlock(c->hash);
goto error;
}
get_param(sec_hdr,s_ealg,ealg);
get_param(sec_hdr,s_alg,alg);
/* and for spis */
get_param(sec_hdr,s_spi_c,tmp);
strtoint(tmp,spi_pc);
get_param(sec_hdr,s_spi_s,tmp);
strtoint(tmp,spi_ps);
/* and for ports */
get_param(sec_hdr,s_port_c,tmp);
strtoint(tmp,port_pc);
get_param(sec_hdr,s_port_s,tmp);
strtoint(tmp,port_ps);
if ((s->data.ipsec->r_ealg.len != ealg.len || strncasecmp(s->data.ipsec->r_ealg.s, ealg.s, ealg.len)) ||
(s->data.ipsec->r_alg.len != alg.len || strncasecmp(s->data.ipsec->r_alg.s, alg.s, alg.len)) ||
(s->data.ipsec->spi_pc != spi_pc) ||
(s->data.ipsec->spi_ps != spi_ps) ||
(pcscf_ipsec_port_c != port_pc) ||
(pcscf_ipsec_port_s != port_ps))
{
LOG(L_INFO,"DBG:"M_NAME":P_verify_security: No valid Security-Verify header!.\n");
r_unlock(c->hash);
goto error;
}
break;
}
r_unlock(c->hash);
return CSCF_RETURN_TRUE;
error:
return CSCF_RETURN_FALSE;
}
/**
* Process the 200 response for REGISTER and creates the first Security-Associations.
* The rest of the SA are not set.
* could come over that one.
* @param rpl - the 200 response
* @param str1 - not used
* @param str2 - not used
* @returns 1 if ok, 0 if not
*/
int P_security_200(struct sip_msg *rpl,char *str1, char *str2)
{
struct sip_msg *req;
str sec_hdr;
r_security_type sec_type;
float sec_q;
struct hdr_field *h;
struct via_body *vb;
r_contact *c;
r_ipsec *i;
int expires;
unsigned long s_hash;
char out_rpl[256],out_req[256],inc_rpl[256];
if (!pcscf_use_ipsec &&!pcscf_use_tls) goto ret_false;
req = cscf_get_request_from_reply(rpl);
if (!req){
LOG(L_ERR,"ERR:"M_NAME":P_security_200: No transactional request found.\n");
goto error;
}
sec_hdr = cscf_get_pref_security_header(req,s_security_client, &sec_type,&sec_q);
if (!sec_hdr.len) {
LOG(L_DBG,"DBG:"M_NAME":P_security_200: No Security-Verify header found.\n");
goto error;
}
/* find the expires (reg or dereg?) */
expires = cscf_get_max_expires(req);
/* get the IPSec info from the registrar */
vb = cscf_get_first_via(req,&h);
LOG(L_DBG,"DBG:"M_NAME":P_security_200: Looking for <%d://%.*s:%d> \n",
vb->proto,vb->host.len,vb->host.s,vb->port);
c = get_r_contact(vb->host,vb->port,vb->proto);
r_act_time();
if (!c){
LOG(L_ERR,"ERR:"M_NAME":P_security_200: Contact not found\n");
goto error;
}
if (c->security_temp){
if (c->security && c->security->type == SEC_TLS &&
(c->security->data.tls && c->security->data.tls->port_tls==req->rcv.src_port&&
c->security->data.tls->session_hash!=0 && c->security->data.tls->session_hash == tls_get_session_hash(req))){
/* don't replace security when doing an integrity protected REGISTER with
* possible attack-garbage from security_temp */
P_security_drop(c,c->security_temp);
free_r_security(c->security_temp);
c->security_temp = 0;
}
else
{
if (c->security) {
P_security_drop(c,c->security);
free_r_security(c->security);
}
c->security = c->security_temp;
c->security_temp = 0;
}
}
switch(sec_type){
case SEC_NONE:
break;
case SEC_TLS:
if (c->security && pcscf_use_tls) {
r_tls *tls;
int port_tls = req->rcv.src_port;
s_hash = get_tls_session_hash(req);
if (!s_hash){
LOG(L_ERR,"ERR:"M_NAME":P_security_200: Session Hash could not be obtained !\n");
r_unlock(c->hash);
goto error;
}
tls = new_r_tls(port_tls, s_hash);
if (!tls) goto error;
c->security->data.tls = tls;
}
r_unlock(c->hash);
break;
case SEC_IPSEC:
if (!r_valid_contact(c)||!c->security||!c->security->data.ipsec ){
LOG(L_DBG,"DBG:"M_NAME":P_security_200: Contact expired or no IPSec info\n");
r_unlock(c->hash);
goto error;
}
i = c->security->data.ipsec;
/* P_Out_Rpl */
sprintf(out_rpl,"%s %.*s %d %s %d %d %.*s %.*s %.*s %.*s",
pcscf_ipsec_P_Out_Rpl,
c->host.len,c->host.s,
i->port_uc,
pcscf_ipsec_host,
pcscf_ipsec_port_s,
i->spi_uc,
i->ealg.len,i->ealg.s,
i->ck.len,i->ck.s,
i->alg.len,i->alg.s,
i->ik.len,i->ik.s );
/* P_Out_Req */
sprintf(out_req,"%s %.*s %d %s %d %d %.*s %.*s %.*s %.*s",
pcscf_ipsec_P_Out_Req,
c->host.len,c->host.s,
i->port_us,
pcscf_ipsec_host,
pcscf_ipsec_port_c,
i->spi_us,
i->ealg.len,i->ealg.s,
i->ck.len,i->ck.s,
i->alg.len,i->alg.s,
i->ik.len,i->ik.s );
/* P_Out_Inc_Rpl */
sprintf(inc_rpl,"%s %.*s %d %s %d %d %.*s %.*s %.*s %.*s",
pcscf_ipsec_P_Inc_Rpl,
c->host.len,c->host.s,
i->port_us,
pcscf_ipsec_host,
pcscf_ipsec_port_c,
i->spi_pc,
i->ealg.len,i->ealg.s,
i->ck.len,i->ck.s,
i->alg.len,i->alg.s,
i->ik.len,i->ik.s );
if (expires<=0) {
/* Deregister */
c->reg_state = DEREGISTERED;
r_act_time();
c->expires = time_now + 60;
}
r_unlock(c->hash);
//print_r(L_CRIT);
/* run the IPSec scripts */
/* Registration */
execute_cmd(out_rpl);
execute_cmd(out_req);
execute_cmd(inc_rpl);
break;
}
return CSCF_RETURN_TRUE;
ret_false:
return CSCF_RETURN_FALSE;
error:
return CSCF_RETURN_ERROR;
}
/**
* Process the 200 response for REGISTER and creates the first Security-Associations.
* The rest of the SA are not set.
* could come over that one.
* @param rpl - the 200 response
* @param str1 - not used
* @param str2 - not used
* @returns 1 if ok, 0 if not
*/
int P_IPSec_200(struct sip_msg *rpl,char *str1, char *str2)
{
struct sip_msg *req;
struct hdr_field *hdr;
str sec_cli;
struct hdr_field *h;
struct via_body *vb;
r_contact *c;
r_ipsec *i;
int expires;
char out_rpl[256],out_req[256],inc_rpl[256];
req = cscf_get_request_from_reply(rpl);
if (!req){
LOG(L_ERR,"ERR:"M_NAME":P_ipsec_200: No transactional request found.\n");
goto error;
}
/* just to jump out if no IPSec is employed - the info is already saved */
sec_cli = cscf_get_security_client(req,&hdr);
if (!sec_cli.len){
LOG(L_DBG,"DBG:"M_NAME":P_ipsec_200: No Security-Client header found.\n");
goto error;
}
/* find the expires (reg or dereg?) */
expires = cscf_get_max_expires(req);
/* get the IPSec info from the registrar */
vb = cscf_get_first_via(req,&h);
// if (!h||!h->parsed){
// LOG(L_ERR,"ERR:"M_NAME":P_ipsec_200: Error extracting sender's id.\n");
// goto error;
// }
// vb = (struct via_body*) h->parsed;
LOG(L_DBG,"DBG:"M_NAME":P_ipsec_200: Looking for <%d://%.*s:%d> \n",
vb->proto,vb->host.len,vb->host.s,vb->port);
c = get_r_contact(vb->host,vb->port,vb->proto);
r_act_time();
if (!c){
LOG(L_ERR,"ERR:"M_NAME":P_ipsec_200: Contact not found\n");
goto error;
}
if (!r_valid_contact(c)||!c->ipsec){
LOG(L_DBG,"DBG:"M_NAME":P_ipsec_200: Contact expired or no IPSec info\n");
r_unlock(c->hash);
goto error;
}
i = c->ipsec;
/* P_Out_Rpl */
sprintf(out_rpl,"%s %.*s %d %s %d %d %.*s %.*s %.*s %.*s",
pcscf_ipsec_P_Out_Rpl,
c->host.len,c->host.s,
i->port_uc,
pcscf_ipsec_host,
pcscf_ipsec_port_s,
i->spi_uc,
i->ealg.len,i->ealg.s,
i->ck.len,i->ck.s,
i->alg.len,i->alg.s,
i->ik.len,i->ik.s );
/* P_Out_Req */
sprintf(out_req,"%s %.*s %d %s %d %d %.*s %.*s %.*s %.*s",
pcscf_ipsec_P_Out_Req,
c->host.len,c->host.s,
i->port_us,
pcscf_ipsec_host,
pcscf_ipsec_port_c,
i->spi_us,
i->ealg.len,i->ealg.s,
i->ck.len,i->ck.s,
i->alg.len,i->alg.s,
i->ik.len,i->ik.s );
/* P_Out_Inc_Rpl */
sprintf(inc_rpl,"%s %.*s %d %s %d %d %.*s %.*s %.*s %.*s",
pcscf_ipsec_P_Inc_Rpl,
c->host.len,c->host.s,
i->port_us,
pcscf_ipsec_host,
pcscf_ipsec_port_c,
i->spi_pc,
i->ealg.len,i->ealg.s,
i->ck.len,i->ck.s,
i->alg.len,i->alg.s,
i->ik.len,i->ik.s );
if (expires<=0) {
/* Deregister */
c->reg_state = DEREGISTERED;
r_act_time();
c->expires = time_now + 60;
}
r_unlock(c->hash);
//print_r(L_CRIT);
/* run the IPSec scripts */
/* Registration */
execute_cmd(out_rpl);
execute_cmd(out_req);
execute_cmd(inc_rpl);
return 1;
error:
return 0;
}
