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srsLTE
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Fixed GUTI attach when authentication fails.

This commit is contained in:
Pedro Alvarez 2018-03-22 14:12:48 +00:00
parent 62dc65556a
commit 3d3027f0b7
1 changed files with 53 additions and 3 deletions
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56
srsepc/src/mme/s1ap_nas_transport.cc
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@ -570,7 +570,7 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
//Create new MME UE S1AP Identity
uint32_t new_mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Make sure context from previous MME
//Make sure context from previous NAS connections is not present
if(ecm_ctx->mme_ue_s1ap_id!=0)
{
m_s1ap->release_ue_ecm_ctx(ecm_ctx->mme_ue_s1ap_id);
@ -609,11 +609,61 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
}
else
{
emm_ctx->security_ctxt.ul_nas_count = 0;
emm_ctx->security_ctxt.dl_nas_count = 0;
//Create new MME UE S1AP Identity
uint32_t new_mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Make sure context from previous NAS connections is not present
if(ecm_ctx->mme_ue_s1ap_id!=0)
{
m_s1ap->release_ue_ecm_ctx(ecm_ctx->mme_ue_s1ap_id);
}
emm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
ecm_ctx->mme_ue_s1ap_id = emm_ctx->mme_ue_s1ap_id;
//Set EMM as de-registered
emm_ctx->state = EMM_STATE_DEREGISTERED;
//Save Attach type
emm_ctx->attach_type = attach_req.eps_attach_type;
//Set UE ECM context
ecm_ctx->imsi = ecm_ctx->imsi;
ecm_ctx->mme_ue_s1ap_id = ecm_ctx->mme_ue_s1ap_id;
//Set eNB information
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
memcpy(&ecm_ctx->enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
//Save whether secure ESM information transfer is necessary
ecm_ctx->eit = pdn_con_req.esm_info_transfer_flag_present;
//Initialize E-RABs
for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++)
{
ecm_ctx->erabs_ctx[i].state = ERAB_DEACTIVATED;
ecm_ctx->erabs_ctx[i].erab_id = i;
}
//Store context based on MME UE S1AP id
m_s1ap->add_ue_ctx_to_mme_ue_s1ap_id_map(ue_ctx);
//NAS integrity failed. Re-start authentication process.
m_s1ap_log->console("GUTI Attach request NAS integrity failed.\n");
m_s1ap_log->console("RE-starting authentication procedure.\n");
//pack_identity_request();
//(srslte::byte_buffer_t *reply_msg, uint32_t enb_ue_s1ap_id, uint32_t mme_ue_s1ap_id)
uint8_t autn[16];
uint8_t rand[16];
//Get Authentication Vectors from HSS
if(!m_hss->gen_auth_info_answer(emm_ctx->imsi, emm_ctx->security_ctxt.k_asme, autn, rand, emm_ctx->security_ctxt.xres))
{
m_s1ap_log->console("User not found. IMSI %015lu\n",emm_ctx->imsi);
m_s1ap_log->info("User not found. IMSI %015lu\n",emm_ctx->imsi);
return false;
}
pack_authentication_request(reply_buffer, ecm_ctx->enb_ue_s1ap_id, ecm_ctx->mme_ue_s1ap_id, autn, rand);
//Send reply to eNB
*reply_flag = true;
m_s1ap_log->info("Downlink NAS: Sent Authentication Request\n");
m_s1ap_log->console("Downlink NAS: Sent Authentication Request\n");
return true;
}
}