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srsRAN_4G
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EPC now sends service reject to a UE that sends service request with bad integrity.

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master
Pedro Alvarez 6 years ago committed by Andre Puschmann
parent dabf586316
commit 1bac758a85
2 changed files with 16 additions and 9 deletions
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2
srsepc/hdr/mme/nas.h
Unescape Escape View File

@ -242,7 +242,7 @@ public:
bool pack_esm_information_request(srslte::byte_buffer_t* nas_buffer);
bool pack_identity_request(srslte::byte_buffer_t* nas_buffer);
bool pack_emm_information(srslte::byte_buffer_t* nas_buffer);
bool pack_service_reject(srslte::byte_buffer_t* nas_buffer);
bool pack_service_reject(srslte::byte_buffer_t* nas_buffer, uint8_t emm_cause);
bool pack_attach_accept(srslte::byte_buffer_t* nas_buffer);
/* Security functions */

23
srsepc/src/mme/nas.cc
Unescape Escape View File

@ -571,8 +571,9 @@ bool nas::handle_service_request(uint32_t m_tmsi,
nas nas_tmp;
nas_tmp.m_ecm_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
nas_tmp.m_ecm_ctx.mme_ue_s1ap_id = s1ap->get_next_mme_ue_s1ap_id();
srslte::byte_buffer_t* nas_tx = pool->allocate();
nas_tmp.pack_service_reject(nas_tx);
nas_tmp.pack_service_reject(nas_tx, LIBLTE_MME_EMM_CAUSE_IMPLICITLY_DETACHED);
s1ap->send_downlink_nas_transport(enb_ue_s1ap_id, nas_tmp.m_ecm_ctx.mme_ue_s1ap_id, nas_tx, *enb_sri);
pool->deallocate(nas_tx);
return true;
@ -585,8 +586,9 @@ bool nas::handle_service_request(uint32_t m_tmsi,
nas nas_tmp;
nas_tmp.m_ecm_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
nas_tmp.m_ecm_ctx.mme_ue_s1ap_id = s1ap->get_next_mme_ue_s1ap_id();
srslte::byte_buffer_t* nas_tx = pool->allocate();
nas_tmp.pack_service_reject(nas_tx);
srslte::byte_buffer_t* nas_tx = pool->allocate();
nas_tmp.pack_service_reject(nas_tx, LIBLTE_MME_EMM_CAUSE_IMPLICITLY_DETACHED);
s1ap->send_downlink_nas_transport(enb_ue_s1ap_id, nas_tmp.m_ecm_ctx.mme_ue_s1ap_id, nas_tx, *enb_sri);
pool->deallocate(nas_tx);
return true;
@ -649,8 +651,15 @@ bool nas::handle_service_request(uint32_t m_tmsi,
s1ap->send_initial_context_setup_request(imsi, 5);
sec_ctx->ul_nas_count++;
} else {
nas_log->console("Service Request -- Short MAC invalid. Ignoring service request\n");
nas_log->warning("Service Request -- Short MAC invalid. Ignoring service request\n");
uint32_t mme_ue_s1ap_id = s1ap->get_next_mme_ue_s1ap_id();
srslte::byte_buffer_t *nas_tx = pool->allocate();
nas_ctx->pack_service_reject(nas_tx, LIBLTE_MME_EMM_CAUSE_UE_IDENTITY_CANNOT_BE_DERIVED_BY_THE_NETWORK);
s1ap->send_downlink_nas_transport(enb_ue_s1ap_id, mme_ue_s1ap_id, nas_tx, *enb_sri);
pool->deallocate(nas_tx);
nas_log->console("Service Request -- Short MAC invalid. Sending service reject.\n");
nas_log->warning("Service Request -- Short MAC invalid. Sending service reject.\n");
nas_log->info("Service Reject -- eNB_UE_S1AP_ID %d MME_UE_S1AP_ID %d.\n", enb_ue_s1ap_id, mme_ue_s1ap_id);
}
return true;
}
@ -1368,10 +1377,8 @@ bool nas::pack_emm_information(srslte::byte_buffer_t* nas_buffer)
return true;
}
bool nas::pack_service_reject(srslte::byte_buffer_t* nas_buffer)
bool nas::pack_service_reject(srslte::byte_buffer_t* nas_buffer, uint8_t emm_cause)
{
uint8_t emm_cause = LIBLTE_MME_EMM_CAUSE_IMPLICITLY_DETACHED;
LIBLTE_MME_SERVICE_REJECT_MSG_STRUCT service_rej;
service_rej.t3442_present = true;
service_rej.t3442.unit = LIBLTE_MME_GPRS_TIMER_DEACTIVATED;

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