400 lines
15 KiB
C
400 lines
15 KiB
C
/*******************************************************************************
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Eurecom OpenAirInterface Core Network
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Copyright(c) 1999 - 2014 Eurecom
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Contact Information
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Openair Admin: openair_admin@eurecom.fr
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Openair Tech : openair_tech@eurecom.fr
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Forums : http://forums.eurecom.fsr/openairinterface
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Address : EURECOM,
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Campus SophiaTech,
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450 Route des Chappes,
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CS 50193
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06904 Biot Sophia Antipolis cedex,
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FRANCE
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*******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "intertask_interface.h"
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#include "mme_app_itti_messaging.h"
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#include "mme_config.h"
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#include "mme_app_ue_context.h"
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#include "mme_app_defs.h"
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#include "assertions.h"
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static
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int mme_app_request_authentication_info(const mme_app_imsi_t imsi,
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const uint8_t nb_of_vectors,
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const plmn_t *plmn,
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const uint8_t *auts);
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static
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int mme_app_request_authentication_info(const mme_app_imsi_t imsi,
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const uint8_t nb_of_vectors,
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const plmn_t *plmn,
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const uint8_t *auts)
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{
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s6a_auth_info_req_t *auth_info_req = NULL;
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MessageDef *message_p = NULL;
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DevAssert(plmn != NULL);
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message_p = itti_alloc_new_message(TASK_MME_APP, S6A_AUTH_INFO_REQ);
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auth_info_req = &message_p->ittiMsg.s6a_auth_info_req;
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MME_APP_IMSI_TO_STRING(imsi, auth_info_req->imsi);
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memcpy(&auth_info_req->visited_plmn, plmn, sizeof(plmn_t));
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auth_info_req->nb_of_vectors = nb_of_vectors;
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if (auts != NULL) {
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auth_info_req->re_synchronization = 1;
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memcpy(auth_info_req->auts, auts, sizeof(auth_info_req->auts));
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} else {
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auth_info_req->re_synchronization = 0;
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memset(auth_info_req->auts, 0, sizeof(auth_info_req->auts));
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}
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return itti_send_msg_to_task(TASK_S6A, INSTANCE_DEFAULT, message_p);
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}
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int mme_app_handle_nas_auth_resp(const nas_auth_resp_t * const nas_auth_resp_pP)
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{
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struct ue_context_s *ue_context = NULL;
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uint64_t imsi = 0;
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DevAssert(nas_auth_resp_pP != NULL);
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MME_APP_STRING_TO_IMSI((char *)nas_auth_resp_pP->imsi, &imsi);
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MME_APP_DEBUG("Handling imsi %"IMSI_FORMAT"\n", imsi);
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if ((ue_context = mme_ue_context_exists_imsi(&mme_app_desc.mme_ue_contexts,
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imsi)) == NULL) {
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MME_APP_ERROR("That's embarrassing as we don't know this IMSI\n");
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AssertFatal(0, "That's embarrassing as we don't know this IMSI\n");
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return -1;
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}
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/* Consider the UE authenticated */
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ue_context->imsi_auth = IMSI_AUTHENTICATED;
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/* TODO: Get keys... */
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/* Now generate S6A ULR */
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{
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MessageDef *message_p = NULL;
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s6a_update_location_req_t *s6a_ulr = NULL;
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message_p = itti_alloc_new_message(TASK_MME_APP, S6A_UPDATE_LOCATION_REQ);
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if (message_p == NULL) {
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return -1;
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}
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s6a_ulr = &message_p->ittiMsg.s6a_update_location_req;
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memcpy(s6a_ulr->imsi, nas_auth_resp_pP->imsi, 16);
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s6a_ulr->initial_attach = INITIAL_ATTACH;
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s6a_ulr->rat_type = RAT_EUTRAN;
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/* Check if we already have UE data */
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s6a_ulr->skip_subscriber_data = 0;
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return itti_send_msg_to_task(TASK_S6A, INSTANCE_DEFAULT, message_p);
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}
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return -1;
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}
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int
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mme_app_handle_authentication_info_answer(
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const s6a_auth_info_ans_t * const s6a_auth_info_ans_pP)
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{
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struct ue_context_s *ue_context;
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uint64_t imsi;
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DevAssert(s6a_auth_info_ans_pP != NULL);
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MME_APP_STRING_TO_IMSI((char *)s6a_auth_info_ans_pP->imsi, &imsi);
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MME_APP_DEBUG("Handling imsi %"IMSI_FORMAT"\n", imsi);
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if ((ue_context = mme_ue_context_exists_imsi(&mme_app_desc.mme_ue_contexts,
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imsi)) == NULL) {
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MME_APP_ERROR("That's embarrassing as we don't know this IMSI\n");
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return -1;
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}
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if ((s6a_auth_info_ans_pP->result.present == S6A_RESULT_BASE) &&
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(s6a_auth_info_ans_pP->result.choice.base == DIAMETER_SUCCESS)) {
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/* S6A procedure has succeeded.
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* We have to request UE authentication.
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*/
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/* Check that list is not empty and contain only one element */
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DevCheck(s6a_auth_info_ans_pP->auth_info.nb_of_vectors == 1,
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s6a_auth_info_ans_pP->auth_info.nb_of_vectors, 1, 0);
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if (ue_context->vector_list == NULL) {
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ue_context->vector_list = malloc(sizeof(eutran_vector_t));
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DevAssert(ue_context->vector_list != NULL);
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} else {
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/* Some vector already exist */
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ue_context->vector_list = realloc(
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ue_context->vector_list,
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(ue_context->nb_of_vectors + s6a_auth_info_ans_pP->auth_info.nb_of_vectors) * sizeof(eutran_vector_t));
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DevAssert(ue_context->vector_list != NULL);
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}
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memcpy(&ue_context->vector_list[ue_context->nb_of_vectors],
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&s6a_auth_info_ans_pP->auth_info.eutran_vector, sizeof(eutran_vector_t));
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ue_context->vector_in_use = &ue_context->vector_list[ue_context->nb_of_vectors];
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ue_context->nb_of_vectors += s6a_auth_info_ans_pP->auth_info.nb_of_vectors;
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MME_APP_DEBUG("INFORMING NAS ABOUT AUTH RESP SUCCESS got %u vector(s)\n",
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s6a_auth_info_ans_pP->auth_info.nb_of_vectors);
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mme_app_itti_auth_rsp(ue_context->ue_id,
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1,
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&s6a_auth_info_ans_pP->auth_info.eutran_vector);
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} else {
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MME_APP_ERROR("INFORMING NAS ABOUT AUTH RESP ERROR CODE\n");
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/* Inform NAS layer with the right failure */
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if (s6a_auth_info_ans_pP->result.present == S6A_RESULT_BASE) {
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mme_app_itti_auth_fail(ue_context->ue_id, s6a_error_2_nas_cause(
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s6a_auth_info_ans_pP->result.choice.base, 0));
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} else {
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mme_app_itti_auth_fail(ue_context->ue_id, s6a_error_2_nas_cause(
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s6a_auth_info_ans_pP->result.choice.experimental, 1));
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}
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}
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return 0;
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}
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#if defined(DISABLE_USE_NAS)
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int mme_app_handle_attach_req(nas_attach_req_t *attach_req_p)
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{
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/* An attach request has been received from NAS layer.
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* If the UE authentication vectors for the UE are known within MME then the
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* authentication procedure should be triggered only if the request is an
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* initial attach, otherwise an update location should be sent to the HSS
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* and default bearer should be established for the provided APN.
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* In case of initial attach procedure, the default APN retrieved from the
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* HSS will be used to establish the default bearer within EPC.
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* The default APN is the one that matches the context-identifier
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*/
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struct ue_context_s *ue_context;
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uint64_t imsi = 0;
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DevAssert(attach_req_p != NULL);
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MME_APP_STRING_TO_IMSI((char *)attach_req_p->imsi, &imsi);
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MME_APP_DEBUG("Handling imsi %"IMSI_FORMAT"\n", imsi);
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ue_context = mme_ue_context_exists_imsi(&mme_app_desc.mme_ue_contexts, imsi);
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if (ue_context == NULL) {
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/* The MME doesn't know this IMSI.
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* Insert the UE to the list of known equipements and
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* Retrieve the authentication vector from HSS.
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*/
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MME_APP_DEBUG("UE context doesn't exist -> create one\n");
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if ((ue_context = mme_create_new_ue_context()) == NULL) {
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/* Error during ue context malloc */
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/* TODO */
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DevMessage("mme_create_new_ue_context");
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return -1;
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}
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ue_context->imsi = imsi;
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ue_context->eNB_ue_s1ap_id = attach_req_p->transparent.eNB_ue_s1ap_id;
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ue_context->mme_ue_s1ap_id = attach_req_p->transparent.mme_ue_s1ap_id;
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ue_context->ue_id = attach_req_p->transparent.mme_ue_s1ap_id;
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// STAILQ_INIT(&ue_context->vector_list);
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DevAssert(mme_insert_ue_context(&mme_app_desc.mme_ue_contexts, ue_context) == 0);
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goto request_auth;
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} else {
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/* MME knows this IMSI, check if UE is authenticated and authentication
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* vectors are known.
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*/
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MME_APP_DEBUG("UE context already exists, use it\n");
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/* Update mme ue s1ap id */
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ue_context->mme_ue_s1ap_id = attach_req_p->transparent.mme_ue_s1ap_id;
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if ((ue_context->imsi_auth == IMSI_AUTHENTICATED) &&
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(attach_req_p->initial != INITIAL_REQUEST)) {
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/* We have to send an update location request to the HSS */
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MME_APP_DEBUG("UE is authenticated\n");
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} else {
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MME_APP_DEBUG("UE is not authenticated\n");
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/* UE is not authenticated or an initial request */
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// if (STAILQ_EMPTY(&ue_context->vector_list))
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if (ue_context->nb_of_vectors == 0)
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request_auth: {
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/* We have no vector for this UE, send an authentication request
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* to the HSS.
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*/
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plmn_t plmn = {
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.MCCdigit2 = 0,
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.MCCdigit1 = 8,
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.MCCdigit3 = 2,
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.MNCdigit1 = 0,
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.MNCdigit2 = 4,
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.MNCdigit3 = 3,
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};
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memcpy(&ue_context->e_utran_cgi, &attach_req_p->transparent.e_utran_cgi,
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sizeof(cgi_t));
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/* Acquire the current time */
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time(&ue_context->cell_age);
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/* Some random values for GUTI */
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ue_context->guti.m_tmsi = 0x24568956;
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ue_context->guti.gummei.MMEcode = 0x01;
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ue_context->guti.gummei.MMEgid = 0x5691;
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memcpy(&ue_context->guti.gummei.plmn, &plmn, sizeof(plmn_t));
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MME_APP_DEBUG("and we have no auth. vector for it, request"
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" authentication information\n");
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// mme_app_dump_ue_contexts();
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mme_app_request_authentication_info(imsi, 1, &plmn, NULL);
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} else {
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nas_auth_req_t *nas_auth_req_p;
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MessageDef *message_p;
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/* We have a vector... USE it */
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MME_APP_DEBUG("but we have an auth. vector for it, request"
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" authentication from NAS\n");
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message_p = itti_alloc_new_message(TASK_MME_APP, NAS_AUTHENTICATION_PARAM_FAIL);
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nas_auth_req_p = &message_p->ittiMsg.nas_auth_req;
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MME_APP_IMSI_TO_STRING(imsi, nas_auth_req_p->imsi);
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nas_auth_req_p->failure = NAS_FAILURE_OK;
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return itti_send_msg_to_task(TASK_NAS_MME, INSTANCE_DEFAULT, message_p);
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}
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}
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}
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return 0;
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}
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#else
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void
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mme_app_handle_nas_auth_param_req(
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const nas_auth_param_req_t * const nas_auth_param_req_pP)
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{
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static const plmn_t visited_plmn_eur = {
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.MCCdigit3 = 2,
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.MCCdigit2 = 0,
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.MCCdigit1 = 8,
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.MNCdigit1 = 0,
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.MNCdigit2 = 1,
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.MNCdigit3 = 0,
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};
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static const plmn_t visited_plmn_dongle = {
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.MCCdigit3 = 2,
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.MCCdigit2 = 0,
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.MCCdigit1 = 8,
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.MNCdigit3 = 2,
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.MNCdigit2 = 9,
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.MNCdigit1 = 0xF,
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};
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plmn_t *visited_plmn = NULL;
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struct ue_context_s *ue_context = NULL;
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uint64_t imsi = 0;
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plmn_t visited_plmn_from_req = {
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.MCCdigit3 = 0,
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.MCCdigit2 = 0,
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.MCCdigit1 = 0,
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.MNCdigit1 = 0,
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.MNCdigit2 = 0,
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.MNCdigit3 = 0,
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};
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DevAssert(nas_auth_param_req_pP != NULL);
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//visited_plmn = &visited_plmn_eur;
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//visited_plmn = &visited_plmn_dongle;
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visited_plmn = &visited_plmn_from_req;
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#warning "assume MNC on 2 digits only"
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visited_plmn_from_req.MCCdigit3 = nas_auth_param_req_pP->imsi[0];
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visited_plmn_from_req.MCCdigit2 = nas_auth_param_req_pP->imsi[1];
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visited_plmn_from_req.MCCdigit1 = nas_auth_param_req_pP->imsi[2];
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visited_plmn_from_req.MNCdigit1 = 0;
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visited_plmn_from_req.MNCdigit2 = nas_auth_param_req_pP->imsi[3];
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visited_plmn_from_req.MNCdigit3 = nas_auth_param_req_pP->imsi[4];
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MME_APP_STRING_TO_IMSI(nas_auth_param_req_pP->imsi, &imsi);
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MME_APP_DEBUG("%s Handling imsi %"IMSI_FORMAT"\n", __FUNCTION__, imsi);
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MME_APP_DEBUG("%s Handling imsi from req %s\n", __FUNCTION__, nas_auth_param_req_pP->imsi);
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/* Fetch the context associated with this IMSI */
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ue_context = mme_ue_context_exists_imsi(&mme_app_desc.mme_ue_contexts, imsi);
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if (ue_context == NULL) {
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/* Currently no context available -> trigger an authentication request
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* to the HSS.
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*/
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MME_APP_DEBUG("UE context search by IMSI failed, try by ue id\n");
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ue_context = mme_ue_context_exists_nas_ue_id(&mme_app_desc.mme_ue_contexts, nas_auth_param_req_pP->ue_id);
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if (ue_context == NULL) {
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// should have been created by initial ue message
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MME_APP_ERROR("UE context doesn't exist -> create one\n");
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if ((ue_context = mme_create_new_ue_context()) == NULL) {
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/* Error during ue context malloc */
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/* TODO */
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DevMessage("mme_create_new_ue_context");
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return;
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}
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ue_context->ue_id = nas_auth_param_req_pP->ue_id;
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ue_context->mme_ue_s1ap_id = nas_auth_param_req_pP->ue_id;
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DevAssert(mme_insert_ue_context(&mme_app_desc.mme_ue_contexts, ue_context) == 0);
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}
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ue_context->imsi = imsi;
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/* We have no vector for this UE, send an authentication request
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* to the HSS.
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*/
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/* Acquire the current time */
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time(&ue_context->cell_age);
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memcpy(&ue_context->guti.gummei.plmn, visited_plmn, sizeof(plmn_t));
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MME_APP_DEBUG("and we have no auth. vector for it, request"
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" authentication information\n");
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mme_app_request_authentication_info(imsi, 1, visited_plmn, NULL);
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} else {
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memcpy(&ue_context->guti.gummei.plmn, visited_plmn, sizeof(plmn_t));
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mme_app_request_authentication_info(imsi, 1, visited_plmn, nas_auth_param_req_pP->auts);
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}
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}
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#endif
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