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Fixed compilation issues. Attach failing with COTS UE.

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master
Pedro Alvarez 6 years ago
parent 1141f43b9c
commit 5eacdd5418
3 changed files with 166 additions and 256 deletions
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11
srsepc/hdr/mme/nas.h
Unescape Escape View File

@ -265,13 +265,10 @@ public:
bool pack_attach_accept(srslte::byte_buffer_t* nas_buffer); bool pack_attach_accept(srslte::byte_buffer_t* nas_buffer);
/* Security functions */ /* Security functions */
bool integrity_check (srslte::byte_buffer_t *pdu); bool integrity_check(srslte::byte_buffer_t* pdu);
bool short_integrity_check (srslte::byte_buffer_t *pdu); bool short_integrity_check(srslte::byte_buffer_t* pdu);
void cipher_decrypt(srslte::byte_buffer_t* pdu);
void cipher_decrypt(eps_sec_ctx_t* sec_ctxt, srslte::byte_buffer_t* pdu); void cipher_encrypt(srslte::byte_buffer_t* pdu);
void cipher_encrypt(eps_sec_ctx_t* sec_ctxt, srslte::byte_buffer_t* pdu);
void integrity_generate(eps_sec_ctx_t* sec_ctxt, srslte::byte_buffer_t* pdu, uint8_t* mac);
/* UE Context */ /* UE Context */
emm_ctx_t m_emm_ctx; emm_ctx_t m_emm_ctx;

187
srsepc/src/mme/nas.cc
Unescape Escape View File

@ -612,7 +612,7 @@ nas::handle_service_request( uint32_t m_tmsi,
s1ap->send_initial_context_setup_request(imsi,5); s1ap->send_initial_context_setup_request(imsi,5);
} else { } else {
nas_log->console("Service Request -- Short MAC invalid. Ignoring service request\n"); nas_log->console("Service Request -- Short MAC invalid. Ignoring service request\n");
nas_log->console("Service Request -- Short MAC invalid. Ignoring service request\n"); nas_log->warning("Service Request -- Short MAC invalid. Ignoring service request\n");
} }
return true; return true;
} }
@ -1257,7 +1257,7 @@ nas::pack_attach_accept(srslte::byte_buffer_t *nas_buffer)
act_def_eps_bearer_context_req.eps_qos.br_ext_present = false; act_def_eps_bearer_context_req.eps_qos.br_ext_present = false;
//set apn //set apn
strncpy(act_def_eps_bearer_context_req.apn.apn, m_apn.c_str(), LIBLTE_STRING_LEN); strncpy(act_def_eps_bearer_context_req.apn.apn, m_apn.c_str(), LIBLTE_STRING_LEN-1);
act_def_eps_bearer_context_req.proc_transaction_id = m_emm_ctx.procedure_transaction_id; //FIXME act_def_eps_bearer_context_req.proc_transaction_id = m_emm_ctx.procedure_transaction_id; //FIXME
//Set DNS server //Set DNS server
@ -1385,65 +1385,172 @@ nas::pack_service_reject(srslte::byte_buffer_t *nas_buffer)
* Security Functions * Security Functions
* *
************************/ ************************/
bool bool nas::short_integrity_check(srslte::byte_buffer_t* pdu)
nas::short_integrity_check(srslte::byte_buffer_t *pdu)
{ {
uint8_t exp_mac[4]; uint8_t exp_mac[4] = {0x00, 0x00, 0x00, 0x00};
uint8_t *mac = &pdu->msg[2]; uint8_t* mac = &pdu->msg[2];
int i; int i;
srslte::security_128_eia1(&m_sec_ctx.k_nas_int[16], if (pdu->N_bytes < 4) {
m_sec_ctx.ul_nas_count, m_nas_log->warning("NAS message to short for short integrity check (pdu len: %d)", pdu->N_bytes);
0, return false;
SECURITY_DIRECTION_UPLINK, }
&pdu->msg[0],
2,
&exp_mac[0]);
switch (m_sec_ctx.integ_algo)
{
case srslte::INTEGRITY_ALGORITHM_ID_EIA0:
break;
case srslte::INTEGRITY_ALGORITHM_ID_128_EIA1:
srslte::security_128_eia1(&m_sec_ctx.k_nas_int[16],
m_sec_ctx.ul_nas_count,
0,
SECURITY_DIRECTION_UPLINK,
&pdu->msg[0],
2,
&exp_mac[0]);
break;
case srslte::INTEGRITY_ALGORITHM_ID_128_EIA2:
srslte::security_128_eia2(&m_sec_ctx.k_nas_int[16],
m_sec_ctx.ul_nas_count,
0,
SECURITY_DIRECTION_UPLINK,
&pdu->msg[0],
2,
&exp_mac[0]);
break;
default:
break;
}
// Check if expected mac equals the sent mac // Check if expected mac equals the sent mac
for(i=0; i<2; i++){ for (i = 0; i < 2; i++) {
if(exp_mac[i+2] != mac[i]){ if (exp_mac[i + 2] != mac[i]) {
m_nas_log->warning("Short integrity check failure. Local: count=%d, [%02x %02x %02x %02x], " m_nas_log->warning("Short integrity check failure. Local: count=%d, [%02x %02x %02x %02x], "
"Received: count=%d, [%02x %02x]\n", "Received: count=%d, [%02x %02x]\n",
m_sec_ctx.ul_nas_count, exp_mac[0], exp_mac[1], exp_mac[2], exp_mac[3], m_sec_ctx.ul_nas_count, exp_mac[0], exp_mac[1], exp_mac[2], exp_mac[3], pdu->msg[1] & 0x1F,
pdu->msg[1] & 0x1F, mac[0], mac[1]); mac[0], mac[1]);
return false; return false;
} }
} }
m_nas_log->info("Integrity check ok. Local: count=%d, Received: count=%d\n", m_nas_log->info("Integrity check ok. Local: count=%d, Received: count=%d\n", m_sec_ctx.ul_nas_count,
m_sec_ctx.ul_nas_count, pdu->msg[1] & 0x1F); pdu->msg[1] & 0x1F);
return true; return true;
} }
bool nas::integrity_check(srslte::byte_buffer_t *pdu)
bool
nas::integrity_check(srslte::byte_buffer_t *pdu)
{ {
uint8_t exp_mac[4]; uint8_t exp_mac[4] = {0x00, 0x00, 0x00, 0x00};
uint8_t *mac = &pdu->msg[1]; uint8_t *mac = &pdu->msg[1];
int i; int i;
srslte::security_128_eia1(&m_sec_ctx.k_nas_int[16], switch (m_sec_ctx.integ_algo)
m_sec_ctx.ul_nas_count, {
0, case srslte::INTEGRITY_ALGORITHM_ID_EIA0:
SECURITY_DIRECTION_UPLINK, break;
&pdu->msg[5], case srslte::INTEGRITY_ALGORITHM_ID_128_EIA1:
pdu->N_bytes-5, srslte::security_128_eia1(&m_sec_ctx.k_nas_int[16],
&exp_mac[0]); m_sec_ctx.ul_nas_count,
0,
SECURITY_DIRECTION_UPLINK,
&pdu->msg[5],
pdu->N_bytes - 5,
&exp_mac[0]);
break;
case srslte::INTEGRITY_ALGORITHM_ID_128_EIA2:
srslte::security_128_eia2(&m_sec_ctx.k_nas_int[16],
m_sec_ctx.ul_nas_count,
0,
SECURITY_DIRECTION_UPLINK,
&pdu->msg[5],
pdu->N_bytes - 5,
&exp_mac[0]);
break;
default:
break;
}
// Check if expected mac equals the sent mac // Check if expected mac equals the sent mac
for(i=0; i<4; i++){ for (i = 0; i < 4; i++) {
if(exp_mac[i] != mac[i]){ if (exp_mac[i] != mac[i]) {
m_nas_log->warning("Integrity check failure. UL Local: count=%d, [%02x %02x %02x %02x], " m_nas_log->warning("Integrity check failure. UL Local: count=%d, [%02x %02x %02x %02x], "
"Received: UL count=%d, [%02x %02x %02x %02x]\n", "Received: UL count=%d, [%02x %02x %02x %02x]\n",
m_sec_ctx.ul_nas_count, exp_mac[0], exp_mac[1], exp_mac[2], exp_mac[3], m_sec_ctx.ul_nas_count, exp_mac[0], exp_mac[1], exp_mac[2], exp_mac[3],
pdu->msg[5], mac[0], mac[1], mac[2], mac[3]); pdu->msg[5], mac[0], mac[1], mac[2], mac[3]);
return false; return false;
} }
} }
m_nas_log->info("Integrity check ok. Local: count=%d, Received: count=%d\n", m_nas_log->info("Integrity check ok. Local: count=%d, Received: count=%d\n",
m_sec_ctx.ul_nas_count, pdu->msg[5]); m_sec_ctx.ul_nas_count, pdu->msg[5]);
return true; return true;
}
void nas::cipher_decrypt(srslte::byte_buffer_t *pdu)
{
srslte::byte_buffer_t tmp_pdu;
switch(m_sec_ctx.cipher_algo)
{
case srslte::CIPHERING_ALGORITHM_ID_EEA0:
break;
case srslte::CIPHERING_ALGORITHM_ID_128_EEA1:
srslte::security_128_eea1(&m_sec_ctx.k_nas_enc[16],
pdu->msg[5],
0, // Bearer always 0 for NAS
SECURITY_DIRECTION_UPLINK,
&pdu->msg[6],
pdu->N_bytes-6,
&tmp_pdu.msg[6]);
memcpy(&pdu->msg[6], &tmp_pdu.msg[6], pdu->N_bytes-6);
m_nas_log->debug_hex(tmp_pdu.msg, pdu->N_bytes, "Decrypted");
break;
case srslte::CIPHERING_ALGORITHM_ID_128_EEA2:
srslte::security_128_eea2(&m_sec_ctx.k_nas_enc[16],
pdu->msg[5],
0, // Bearer always 0 for NAS
SECURITY_DIRECTION_UPLINK,
&pdu->msg[6],
pdu->N_bytes-6,
&tmp_pdu.msg[6]);
m_nas_log->debug_hex(tmp_pdu.msg, pdu->N_bytes, "Decrypted");
memcpy(&pdu->msg[6], &tmp_pdu.msg[6], pdu->N_bytes-6);
break;
default:
m_nas_log->error("Ciphering algorithms not known\n");
break;
}
}
void nas::cipher_encrypt(srslte::byte_buffer_t *pdu)
{
srslte::byte_buffer_t pdu_tmp;
switch(m_sec_ctx.cipher_algo)
{
case srslte::CIPHERING_ALGORITHM_ID_EEA0:
break;
case srslte::CIPHERING_ALGORITHM_ID_128_EEA1:
srslte::security_128_eea1(&m_sec_ctx.k_nas_enc[16],
pdu->msg[5],
0, // Bearer always 0 for NAS
SECURITY_DIRECTION_DOWNLINK,
&pdu->msg[6],
pdu->N_bytes-6,
&pdu_tmp.msg[6]);
memcpy(&pdu->msg[6], &pdu_tmp.msg[6], pdu->N_bytes-6);
m_nas_log->debug_hex(pdu_tmp.msg, pdu->N_bytes, "Encrypted");
break;
case srslte::CIPHERING_ALGORITHM_ID_128_EEA2:
srslte::security_128_eea2(&m_sec_ctx.k_nas_enc[16],
pdu->msg[5],
0, // Bearer always 0 for NAS
SECURITY_DIRECTION_DOWNLINK,
&pdu->msg[6],
pdu->N_bytes-6,
&pdu_tmp.msg[6]);
memcpy(&pdu->msg[6], &pdu_tmp.msg[6], pdu->N_bytes-6);
m_nas_log->debug_hex(pdu_tmp.msg, pdu->N_bytes, "Encrypted");
break;
default:
m_nas_log->error("Ciphering algorithm not known\n");
break;
}
} }
} //namespace srsepc } //namespace srsepc

224
srsepc/src/mme/s1ap_nas_transport.cc
Unescape Escape View File

@ -31,6 +31,7 @@
#include "srsepc/hdr/mme/s1ap_nas_transport.h" #include "srsepc/hdr/mme/s1ap_nas_transport.h"
#include "srslte/common/security.h" #include "srslte/common/security.h"
#include "srslte/common/liblte_security.h" #include "srslte/common/liblte_security.h"
#include "srslte/common/int_helpers.h"
namespace srsepc{ namespace srsepc{
@ -98,7 +99,7 @@ bool s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUE
nas_init.dns = m_s1ap->m_s1ap_args.dns_addr; nas_init.dns = m_s1ap->m_s1ap_args.dns_addr;
if(init_ue->S_TMSI_present){ if(init_ue->S_TMSI_present){
m_tmsi = srslte::uint8_to_uint32(init_ue->S_TMSI.m_TMSI.buffer); srslte::uint8_to_uint32(init_ue->S_TMSI.m_TMSI.buffer, &m_tmsi);
} }
switch (msg_type) { switch (msg_type) {
@ -228,8 +229,9 @@ bool s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKN
// - DETACH REQUEST; // - DETACH REQUEST;
// - DETACH ACCEPT; // - DETACH ACCEPT;
// - TRACKING AREA UPDATE REQUEST. // - TRACKING AREA UPDATE REQUEST.
m_s1ap_log->info("UL NAS: sec_hdr_type: 0x%x, mac_vaild: %s, msg_encrypted: %s\n", sec_hdr_type,
mac_valid == true ? "yes" : "no", msg_encrypted == true ? "yes" : "no");
m_s1ap_log->info("UL NAS: sec_hdr_type: 0x%x, mac_vaild: %s, msg_encrypted: %s\n",sec_hdr_type, mac_valid == true ? "yes" : "no", msg_encrypted == true ? "yes" : "no");
switch (msg_type) switch (msg_type)
{ {
case LIBLTE_MME_MSG_TYPE_IDENTITY_RESPONSE: case LIBLTE_MME_MSG_TYPE_IDENTITY_RESPONSE:
@ -241,29 +243,30 @@ bool s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKN
m_s1ap_log->info("UL NAS: Received Authentication Response\n"); m_s1ap_log->info("UL NAS: Received Authentication Response\n");
m_s1ap_log->console("UL NAS: Received Authentication Response\n"); m_s1ap_log->console("UL NAS: Received Authentication Response\n");
nas_ctx->handle_authentication_response(nas_msg); nas_ctx->handle_authentication_response(nas_msg);
// In case of a successful authentication response, security mode command follows. Reset counter for incoming security mode complete // In case of a successful authentication response, security mode command follows.
emm_ctx->security_ctxt.ul_nas_count = 0; // Reset counter for incoming security mode complete
emm_ctx->security_ctxt.dl_nas_count = 0; sec_ctx->ul_nas_count = 0;
sec_ctx->dl_nas_count = 0;
increase_ul_nas_cnt = false; increase_ul_nas_cnt = false;
break; break;
// Authentication failure with the option sync failure can be sent not integrity protected // Authentication failure with the option sync failure can be sent not integrity protected
case LIBLTE_MME_MSG_TYPE_AUTHENTICATION_FAILURE: case LIBLTE_MME_MSG_TYPE_AUTHENTICATION_FAILURE:
m_s1ap_log->info("UL NAS: Authentication Failure\n"); m_s1ap_log->info("UL NAS: Authentication Failure\n");
m_s1ap_log->console("UL NAS: Authentication Failure\n"); m_s1ap_log->console("UL NAS: Authentication Failure\n");
handle_authentication_failure(nas_msg, ue_ctx, reply_buffer, reply_flag); nas_ctx->handle_authentication_failure(nas_msg);
break; break;
// Detach request can be sent not integrity protected when "power off" option is used // Detach request can be sent not integrity protected when "power off" option is used
case LIBLTE_MME_MSG_TYPE_DETACH_REQUEST: case LIBLTE_MME_MSG_TYPE_DETACH_REQUEST:
m_s1ap_log->info("UL NAS: Detach Request\n"); m_s1ap_log->info("UL NAS: Detach Request\n");
m_s1ap_log->console("UL NAS: Detach Request\n"); m_s1ap_log->console("UL NAS: Detach Request\n");
// FIXME: check integrity protection in detach request // FIXME: check integrity protection in detach request
nas_ctx->handle_nas_detach_request(nas_msg); nas_ctx->handle_detach_request(nas_msg);
break; break;
case LIBLTE_MME_MSG_TYPE_SECURITY_MODE_COMPLETE: case LIBLTE_MME_MSG_TYPE_SECURITY_MODE_COMPLETE:
m_s1ap_log->info("UL NAS: Received Security Mode Complete\n"); m_s1ap_log->info("UL NAS: Received Security Mode Complete\n");
m_s1ap_log->console("UL NAS: Received Security Mode Complete\n"); m_s1ap_log->console("UL NAS: Received Security Mode Complete\n");
if(sec_hdr_type == LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY_AND_CIPHERED_WITH_NEW_EPS_SECURITY_CONTEXT && mac_valid == true){ if(sec_hdr_type == LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY_AND_CIPHERED_WITH_NEW_EPS_SECURITY_CONTEXT && mac_valid == true){
handle_nas_security_mode_complete(nas_msg, ue_ctx, reply_buffer, reply_flag); nas_ctx->handle_security_mode_complete(nas_msg);
} else { } else {
// Security Mode Complete was not integrity protected // Security Mode Complete was not integrity protected
m_s1ap_log->console("Security Mode Complete not integrity protected. Discard message.\n"); m_s1ap_log->console("Security Mode Complete not integrity protected. Discard message.\n");
@ -275,7 +278,7 @@ bool s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKN
m_s1ap_log->info("UL NAS: Received Attach Complete\n"); m_s1ap_log->info("UL NAS: Received Attach Complete\n");
m_s1ap_log->console("UL NAS: Received Attach Complete\n"); m_s1ap_log->console("UL NAS: Received Attach Complete\n");
if(sec_hdr_type == LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY_AND_CIPHERED && mac_valid == true){ if(sec_hdr_type == LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY_AND_CIPHERED && mac_valid == true){
handle_nas_attach_complete(nas_msg, ue_ctx, reply_buffer, reply_flag); nas_ctx->handle_attach_complete(nas_msg);
} else { } else {
// Attach Complete was not integrity protected // Attach Complete was not integrity protected
m_s1ap_log->console("Attach Complete not integrity protected. Discard message.\n"); m_s1ap_log->console("Attach Complete not integrity protected. Discard message.\n");
@ -287,7 +290,7 @@ bool s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKN
m_s1ap_log->info("UL NAS: Received ESM Information Response\n"); m_s1ap_log->info("UL NAS: Received ESM Information Response\n");
m_s1ap_log->console("UL NAS: Received ESM Information Response\n"); m_s1ap_log->console("UL NAS: Received ESM Information Response\n");
if(sec_hdr_type == LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY_AND_CIPHERED && mac_valid == true){ if(sec_hdr_type == LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY_AND_CIPHERED && mac_valid == true){
handle_esm_information_response(nas_msg, ue_ctx, reply_buffer, reply_flag); nas_ctx->handle_esm_information_response(nas_msg);
} else { } else {
// Attach Complete was not integrity protected // Attach Complete was not integrity protected
m_s1ap_log->console("ESM Information Response not integrity protected. Discard message.\n"); m_s1ap_log->console("ESM Information Response not integrity protected. Discard message.\n");
@ -298,7 +301,7 @@ bool s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKN
case LIBLTE_MME_MSG_TYPE_TRACKING_AREA_UPDATE_REQUEST: case LIBLTE_MME_MSG_TYPE_TRACKING_AREA_UPDATE_REQUEST:
m_s1ap_log->info("UL NAS: Tracking Area Update Request\n"); m_s1ap_log->info("UL NAS: Tracking Area Update Request\n");
m_s1ap_log->console("UL NAS: Tracking Area Update Request\n"); m_s1ap_log->console("UL NAS: Tracking Area Update Request\n");
handle_tracking_area_update_request(nas_msg, ue_ctx, reply_buffer, reply_flag); nas_ctx->handle_tracking_area_update_request(nas_msg);
break; break;
default: default:
m_s1ap_log->warning("Unhandled NAS integrity protected message %s\n", liblte_nas_msg_type_to_string(msg_type)); m_s1ap_log->warning("Unhandled NAS integrity protected message %s\n", liblte_nas_msg_type_to_string(msg_type));
@ -309,7 +312,7 @@ bool s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKN
//Increment UL NAS count. if counter not resetted in function, e.g., DL Security mode command after Authentication response //Increment UL NAS count. if counter not resetted in function, e.g., DL Security mode command after Authentication response
if (increase_ul_nas_cnt == true) { if (increase_ul_nas_cnt == true) {
emm_ctx->security_ctxt.ul_nas_count++; sec_ctx->ul_nas_count++;
} }
m_pool->deallocate(nas_msg); m_pool->deallocate(nas_msg);
return true; return true;
@ -357,202 +360,5 @@ bool s1ap_nas_transport::send_downlink_nas_transport(uint32_t enb_ue_s1ap_id, ui
return true; return true;
} }
//Security Functions
bool s1ap_nas_transport::short_integrity_check(eps_sec_ctx_t* sec_ctxt, srslte::byte_buffer_t* pdu)
{
uint8_t exp_mac[4] = {0x00, 0x00, 0x00, 0x00};
uint8_t *mac = &pdu->msg[2];
int i;
if(pdu->N_bytes < 4){
m_s1ap_log->warning("NAS message to short for short integrity check (pdu len: %d)", pdu->N_bytes);
return false;
}
switch (sec_ctxt->integ_algo)
{
case srslte::INTEGRITY_ALGORITHM_ID_EIA0:
break;
case srslte::INTEGRITY_ALGORITHM_ID_128_EIA1:
srslte::security_128_eia1(&sec_ctxt->k_nas_int[16],
sec_ctxt->ul_nas_count,
0,
SECURITY_DIRECTION_UPLINK,
&pdu->msg[0],
2,
&exp_mac[0]);
break;
case srslte::INTEGRITY_ALGORITHM_ID_128_EIA2:
srslte::security_128_eia2(&sec_ctxt->k_nas_int[16],
sec_ctxt->ul_nas_count,
0,
SECURITY_DIRECTION_UPLINK,
&pdu->msg[0],
2,
&exp_mac[0]);
break;
default:
break;
}
// Check if expected mac equals the sent mac
for(i=0; i<2; i++){
if(exp_mac[i+2] != mac[i]){
m_s1ap_log->warning("Short integrity check failure. Local: count=%d, [%02x %02x %02x %02x], "
"Received: count=%d, [%02x %02x]\n",
sec_ctxt->ul_nas_count, exp_mac[0], exp_mac[1], exp_mac[2], exp_mac[3],
pdu->msg[1] & 0x1F, mac[0], mac[1]);
return false;
}
}
m_s1ap_log->info("Integrity check ok. Local: count=%d, Received: count=%d\n",
sec_ctxt->ul_nas_count, pdu->msg[1] & 0x1F);
return true;
}
bool s1ap_nas_transport::integrity_check(eps_sec_ctx_t *sec_ctxt, srslte::byte_buffer_t *pdu)
{
uint8_t exp_mac[4] = {0x00, 0x00, 0x00, 0x00};
uint8_t *mac = &pdu->msg[1];
int i;
switch (sec_ctxt->integ_algo)
{
case srslte::INTEGRITY_ALGORITHM_ID_EIA0:
break;
case srslte::INTEGRITY_ALGORITHM_ID_128_EIA1:
srslte::security_128_eia1(&sec_ctxt->k_nas_int[16],
sec_ctxt->ul_nas_count,
0,
SECURITY_DIRECTION_UPLINK,
&pdu->msg[5],
pdu->N_bytes - 5,
&exp_mac[0]);
break;
case srslte::INTEGRITY_ALGORITHM_ID_128_EIA2:
srslte::security_128_eia2(&sec_ctxt->k_nas_int[16],
sec_ctxt->ul_nas_count,
0,
SECURITY_DIRECTION_UPLINK,
&pdu->msg[5],
pdu->N_bytes - 5,
&exp_mac[0]);
break;
default:
break;
}
// Check if expected mac equals the sent mac
for (i = 0; i < 4; i++) {
if (exp_mac[i] != mac[i]) {
m_s1ap_log->warning("Integrity check failure. UL Local: count=%d, [%02x %02x %02x %02x], "
"Received: UL count=%d, [%02x %02x %02x %02x]\n",
sec_ctxt->ul_nas_count, exp_mac[0], exp_mac[1], exp_mac[2], exp_mac[3],
pdu->msg[5], mac[0], mac[1], mac[2], mac[3]);
return false;
}
}
m_s1ap_log->info("Integrity check ok. Local: count=%d, Received: count=%d\n",
sec_ctxt->ul_nas_count, pdu->msg[5]);
return true;
}
void s1ap_nas_transport::cipher_decrypt(eps_sec_ctx_t * sec_ctxt, srslte::byte_buffer_t *pdu)
{
srslte::byte_buffer_t tmp_pdu;
switch(sec_ctxt->cipher_algo)
{
case srslte::CIPHERING_ALGORITHM_ID_EEA0:
break;
case srslte::CIPHERING_ALGORITHM_ID_128_EEA1:
srslte::security_128_eea1(&sec_ctxt->k_nas_enc[16],
pdu->msg[5],
0, // Bearer always 0 for NAS
SECURITY_DIRECTION_UPLINK,
&pdu->msg[6],
pdu->N_bytes-6,
&tmp_pdu.msg[6]);
memcpy(&pdu->msg[6], &tmp_pdu.msg[6], pdu->N_bytes-6);
m_s1ap_log->debug_hex(tmp_pdu.msg, pdu->N_bytes, "Decrypted");
break;
case srslte::CIPHERING_ALGORITHM_ID_128_EEA2:
srslte::security_128_eea2(&sec_ctxt->k_nas_enc[16],
pdu->msg[5],
0, // Bearer always 0 for NAS
SECURITY_DIRECTION_UPLINK,
&pdu->msg[6],
pdu->N_bytes-6,
&tmp_pdu.msg[6]);
m_s1ap_log->debug_hex(tmp_pdu.msg, pdu->N_bytes, "Decrypted");
memcpy(&pdu->msg[6], &tmp_pdu.msg[6], pdu->N_bytes-6);
break;
default:
m_s1ap_log->error("Ciphering algorithms not known\n");
break;
}
}
void s1ap_nas_transport::cipher_encrypt(eps_sec_ctx_t * sec_ctxt, srslte::byte_buffer_t *pdu)
{
srslte::byte_buffer_t pdu_tmp;
switch(sec_ctxt->cipher_algo)
{
case srslte::CIPHERING_ALGORITHM_ID_EEA0:
break;
case srslte::CIPHERING_ALGORITHM_ID_128_EEA1:
srslte::security_128_eea1(&sec_ctxt->k_nas_enc[16],
pdu->msg[5],
0, // Bearer always 0 for NAS
SECURITY_DIRECTION_DOWNLINK,
&pdu->msg[6],
pdu->N_bytes-6,
&pdu_tmp.msg[6]);
memcpy(&pdu->msg[6], &pdu_tmp.msg[6], pdu->N_bytes-6);
m_s1ap_log->debug_hex(pdu_tmp.msg, pdu->N_bytes, "Encrypted");
break;
case srslte::CIPHERING_ALGORITHM_ID_128_EEA2:
srslte::security_128_eea2(&sec_ctxt->k_nas_enc[16],
pdu->msg[5],
0, // Bearer always 0 for NAS
SECURITY_DIRECTION_DOWNLINK,
&pdu->msg[6],
pdu->N_bytes-6,
&pdu_tmp.msg[6]);
memcpy(&pdu->msg[6], &pdu_tmp.msg[6], pdu->N_bytes-6);
m_s1ap_log->debug_hex(pdu_tmp.msg, pdu->N_bytes, "Encrypted");
break;
default:
m_s1ap_log->error("Ciphering algorithm not known\n");
break;
}
}
void s1ap_nas_transport::integrity_generate(eps_sec_ctx_t *sec_ctxt,
srslte::byte_buffer_t *pdu,
uint8_t *mac) {
switch (sec_ctxt->integ_algo) {
case srslte::INTEGRITY_ALGORITHM_ID_EIA0:
break;
case srslte::INTEGRITY_ALGORITHM_ID_128_EIA1:
srslte::security_128_eia1(&sec_ctxt->k_nas_int[16],
sec_ctxt->dl_nas_count,
0, // Bearer always 0 for NAS
SECURITY_DIRECTION_DOWNLINK,
&pdu->msg[5],
pdu->N_bytes - 5,
mac);
break;
case srslte::INTEGRITY_ALGORITHM_ID_128_EIA2:
srslte::security_128_eia2(&sec_ctxt->k_nas_int[16],
sec_ctxt->dl_nas_count,
0, // Bearer always 0 for NAS
SECURITY_DIRECTION_DOWNLINK,
&pdu->msg[5],
pdu->N_bytes - 5,
mac);
break;
default:
break;
}
}
} //namespace srsepc } //namespace srsepc

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