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srsRAN_4G
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starting to work on the security mode command

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master
Pedro Alvarez 7 years ago
parent 44a28b3302
commit d5e1290883
2 changed files with 137 additions and 14 deletions
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52
srsepc/src/mme/s1ap.cc
Unescape Escape View File

@ -319,17 +319,21 @@ s1ap::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRANSPORT_STRUCT
bool ue_valid = true;
uint32_t enb_ue_s1ap_id = ul_xport->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID;
uint32_t mme_ue_s1ap_id = ul_xport->MME_UE_S1AP_ID.MME_UE_S1AP_ID;
ue_ctx_t *ue_ctx;
LIBLTE_MME_AUTHENTICATION_RESPONSE_MSG_STRUCT auth_resp;
srslte::byte_buffer_t *reply_msg = m_pool->allocate();
m_s1ap_log->console("Received Uplink NAS Transport message. MME-UE S1AP Id: %d\n",mme_ue_s1ap_id);
m_s1ap_log->info("Received Uplink NAS Transport message. MME-UE S1AP Id: %d\n",mme_ue_s1ap_id);
//mme_ue_ctx_t ue_ctx = m_mme_ue_map[mme_ue_s1ap_id];
//if(mme_ue_ctx == m_mme_ue_map.end())
//{
//
//}
std::map<uint32_t, ue_ctx_t*>::iterator it = m_active_ues.find(mme_ue_s1ap_id);
ue_ctx = it->second;
if(it == m_active_ues.end())
{
//TODO UE not registered, send error message.
return false;
}
//Get NAS authentication response
if(!m_s1ap_nas_transport.unpack_authentication_response(ul_xport, &auth_resp))
@ -338,13 +342,23 @@ s1ap::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRANSPORT_STRUCT
return false;
}
//for(int i=0; i<16;i++)
//{
// if(auth_resp.res[i] != ue_ctx.xres[i])
// {
// ue_valid = false;
// }
//}
for(int i=0; i<16;i++)
{
if(auth_resp.res[i] != ue_ctx->xres[i])
{
ue_valid = false;
}
}
if(!ue_valid)
{
m_s1ap_log->warning("UE Authentication Rejected. IMSI: %lu\n", ue_ctx->imsi);
//TODO send back error reply
return false;
}
m_s1ap_log->console("UE Authentication Accepted. IMSI: %lu\n", ue_ctx->imsi);
m_s1ap_nas_transport.pack_security_mode_command();
/*
typedef struct{
@ -368,6 +382,20 @@ s1ap::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRANSPORT_STRUCT
}LIBLTE_MME_AUTHENTICATION_RESPONSE_MSG_STRUCT;
*/
/*
typedef struct{
LIBLTE_MME_NAS_SECURITY_ALGORITHMS_STRUCT selected_nas_sec_algs;
LIBLTE_MME_NAS_KEY_SET_ID_STRUCT nas_ksi;
LIBLTE_MME_UE_SECURITY_CAPABILITIES_STRUCT ue_security_cap;
LIBLTE_MME_IMEISV_REQUEST_ENUM imeisv_req;
uint32 nonce_ue;
uint32 nonce_mme;
bool imeisv_req_present;
bool nonce_ue_present;
bool nonce_mme_present;
}LIBLTE_MME_SECURITY_MODE_COMMAND_MSG_STRUCT;
*/
//m_s1ap_nas_transport.log_unhandled_uplink_nas_transport_message_ies(ul_xport);
return true;

99
srsepc/src/mme/s1ap_nas_transport.cc
Unescape Escape View File

@ -182,10 +182,105 @@ s1ap_nas_transport::unpack_authentication_response(LIBLTE_S1AP_MESSAGE_UPLINKNAS
return true;
}
s1ap_nas_transport::pack_security_mode_command(srslte::byte_buffer_t reply_msg, mme_ue_ctx_t *ue_ctx)
{
srslte::byte_buffer_t *nas_buffer = m_pool->allocate();
//Setup initiating message
LIBLTE_S1AP_S1AP_PDU_STRUCT tx_pdu;
bzero(&tx_pdu, sizeof(LIBLTE_S1AP_S1AP_PDU_STRUCT));
tx_pdu.ext = false;
tx_pdu.choice_type = LIBLTE_S1AP_S1AP_PDU_CHOICE_INITIATINGMESSAGE;
LIBLTE_S1AP_INITIATINGMESSAGE_STRUCT *init = &tx_pdu.choice.initiatingMessage;
init->procedureCode = LIBLTE_S1AP_PROC_ID_DOWNLINKNASTRANSPORT;
init->choice_type = LIBLTE_S1AP_INITIATINGMESSAGE_CHOICE_DOWNLINKNASTRANSPORT;
//Setup Dw NAS structure
LIBLTE_S1AP_MESSAGE_DOWNLINKNASTRANSPORT_STRUCT *dw_nas = &init->choice.DownlinkNASTransport;
dw_nas->ext=false;
dw_nas->MME_UE_S1AP_ID.MME_UE_S1AP_ID = ue_ctx->mme_ue_s1ap_id;
dw_nas->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID = ue_ctx->enb_ue_s1ap_id;
dw_nas->HandoverRestrictionList_present=false;
dw_nas->SubscriberProfileIDforRFP_present=false;
m_s1ap_log->console("Dw NAS id %d\n", ue_ctx->enb_ue_s1ap_id);
//Pack NAS PDU
LIBLTE_MME_SECURITY_MODE_COMMAND_MSG_STRUCT sm_cmd;
sm_cmd.selected_nas_sec_algs;
sm_cmd.nas_ksi.tsc_flag=LIBLTE_MME_TYPE_OF_SECURITY_CONTEXT_FLAG_NATIVE;
sm_cmd.nas_ksi.nas_ksi=0;
LIBLTE_ERROR_ENUM err = liblte_mme_pack_security_mode_command_msg(&sm_cmd, (LIBLTE_BYTE_MSG_STRUCT *) nas_buffer);
if(err != LIBLTE_SUCCESS)
{
m_s1ap_log->console("Error packing Athentication Request\n");
return false;
}
//Copy NAS PDU to Downlink NAS Trasport message buffer
memcpy(dw_nas->NAS_PDU.buffer, nas_buffer->msg, nas_buffer->N_bytes);
dw_nas->NAS_PDU.n_octets = nas_buffer->N_bytes;
//Pack Downlink NAS Transport Message
err = liblte_s1ap_pack_s1ap_pdu(&tx_pdu, (LIBLTE_BYTE_MSG_STRUCT *) reply_msg);
if(err != LIBLTE_SUCCESS)
{
m_s1ap_log->console("Error packing Athentication Request\n");
return false;
}
m_pool->deallocate(nas_buffer);
return true;
}
/*
typedef struct{
LIBLTE_MME_NAS_SECURITY_ALGORITHMS_STRUCT selected_nas_sec_algs;
LIBLTE_MME_NAS_KEY_SET_ID_STRUCT nas_ksi;
LIBLTE_MME_UE_SECURITY_CAPABILITIES_STRUCT ue_security_cap;
LIBLTE_MME_IMEISV_REQUEST_ENUM imeisv_req;
uint32 nonce_ue;
uint32 nonce_mme;
bool imeisv_req_present;
bool nonce_ue_present;
bool nonce_mme_present;
}LIBLTE_MME_SECURITY_MODE_COMMAND_MSG_STRUCT;
*/
/*
typedef struct{
LIBLTE_MME_TYPE_OF_CIPHERING_ALGORITHM_ENUM type_of_eea;
LIBLTE_MME_TYPE_OF_INTEGRITY_ALGORITHM_ENUM type_of_eia;
}LIBLTE_MME_NAS_SECURITY_ALGORITHMS_STRUCT;
*/
/*
typedef struct{
LIBLTE_MME_TYPE_OF_SECURITY_CONTEXT_FLAG_ENUM tsc_flag;
uint8 nas_ksi;
}LIBLTE_MME_NAS_KEY_SET_ID_STRUCT;
*/
/*
typedef struct{
bool eea[8];
bool eia[8];
bool uea[8];
bool uea_present;
bool uia[8];
bool uia_present;
bool gea[8];
bool gea_present;
}LIBLTE_MME_UE_SECURITY_CAPABILITIES_STRUCT;
*/
}
/*Helper functions*/
void
s1ap_nas_transport::log_unhandled_attach_request_ies(const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT *attach_req)
voi::log_unhandled_attach_request_ies(const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT *attach_req)
{
if(attach_req->old_p_tmsi_signature_present)
{

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