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srsRAN_4G
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add support for ciphered authentication response

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master
Andre Puschmann 6 years ago
parent b3e21780be
commit 9b894799f0
4 changed files with 41 additions and 11 deletions
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2
lib/include/srslte/asn1/liblte_mme.h
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@ -2814,6 +2814,8 @@ typedef struct{
}LIBLTE_MME_AUTHENTICATION_RESPONSE_MSG_STRUCT;
// Functions
LIBLTE_ERROR_ENUM liblte_mme_pack_authentication_response_msg(LIBLTE_MME_AUTHENTICATION_RESPONSE_MSG_STRUCT *auth_resp,
uint8 sec_hdr_type,
uint32 count,
LIBLTE_BYTE_MSG_STRUCT *msg);
LIBLTE_ERROR_ENUM liblte_mme_unpack_authentication_response_msg(LIBLTE_BYTE_MSG_STRUCT *msg,
LIBLTE_MME_AUTHENTICATION_RESPONSE_MSG_STRUCT *auth_resp);

17
lib/src/asn1/liblte_mme.cc
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@ -6180,6 +6180,8 @@ LIBLTE_ERROR_ENUM liblte_mme_unpack_authentication_request_msg(LIBLTE_BYTE_MSG_S
Document Reference: 24.301 v10.2.0 Section 8.2.8
*********************************************************************/
LIBLTE_ERROR_ENUM liblte_mme_pack_authentication_response_msg(LIBLTE_MME_AUTHENTICATION_RESPONSE_MSG_STRUCT *auth_resp,
uint8 sec_hdr_type,
uint32 count,
LIBLTE_BYTE_MSG_STRUCT *msg)
{
LIBLTE_ERROR_ENUM err = LIBLTE_ERROR_INVALID_INPUTS;
@ -6188,6 +6190,21 @@ LIBLTE_ERROR_ENUM liblte_mme_pack_authentication_response_msg(LIBLTE_MME_AUTHENT
if(auth_resp != NULL &&
msg != NULL)
{
if(LIBLTE_MME_SECURITY_HDR_TYPE_PLAIN_NAS != sec_hdr_type)
{
// Protocol Discriminator and Security Header Type
*msg_ptr = (sec_hdr_type << 4) | (LIBLTE_MME_PD_EPS_MOBILITY_MANAGEMENT);
msg_ptr++;
// MAC will be filled in later
msg_ptr += 4;
// Sequence Number
*msg_ptr = count & 0xFF;
msg_ptr++;
}
// Protocol Discriminator and Security Header Type
*msg_ptr = (LIBLTE_MME_SECURITY_HDR_TYPE_PLAIN_NAS << 4) | (LIBLTE_MME_PD_EPS_MOBILITY_MANAGEMENT);
msg_ptr++;

4
srsue/hdr/upper/nas.h
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@ -166,7 +166,7 @@ private:
// Parsers
void parse_attach_accept(uint32_t lcid, byte_buffer_t *pdu);
void parse_attach_reject(uint32_t lcid, byte_buffer_t *pdu);
void parse_authentication_request(uint32_t lcid, byte_buffer_t *pdu);
void parse_authentication_request(uint32_t lcid, byte_buffer_t *pdu, const uint8_t sec_hdr_type);
void parse_authentication_reject(uint32_t lcid, byte_buffer_t *pdu);
void parse_identity_request(uint32_t lcid, byte_buffer_t *pdu);
void parse_security_mode_command(uint32_t lcid, byte_buffer_t *pdu);
@ -182,7 +182,7 @@ private:
void send_identity_response();
void send_service_request();
void send_esm_information_response(const uint8 proc_transaction_id);
void send_authentication_response(const uint8_t* res, const size_t res_len);
void send_authentication_response(const uint8_t* res, const size_t res_len, const uint8_t sec_hdr_type);
void send_authentication_failure(const uint8_t cause, const uint8_t* auth_fail_param);
void gen_pdn_connectivity_request(LIBLTE_BYTE_MSG_STRUCT *msg);
void send_security_mode_reject(uint8_t cause);

29
srsue/src/upper/nas.cc
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@ -331,7 +331,7 @@ void nas::write_pdu(uint32_t lcid, byte_buffer_t *pdu) {
parse_attach_reject(lcid, pdu);
break;
case LIBLTE_MME_MSG_TYPE_AUTHENTICATION_REQUEST:
parse_authentication_request(lcid, pdu);
parse_authentication_request(lcid, pdu, sec_hdr_type);
break;
case LIBLTE_MME_MSG_TYPE_AUTHENTICATION_REJECT:
parse_authentication_reject(lcid, pdu);
@ -722,7 +722,7 @@ void nas::parse_attach_reject(uint32_t lcid, byte_buffer_t *pdu) {
// FIXME: Command RRC to release?
}
void nas::parse_authentication_request(uint32_t lcid, byte_buffer_t *pdu) {
void nas::parse_authentication_request(uint32_t lcid, byte_buffer_t *pdu, const uint8_t sec_hdr_type) {
LIBLTE_MME_AUTHENTICATION_REQUEST_MSG_STRUCT auth_req;
bzero(&auth_req, sizeof(LIBLTE_MME_AUTHENTICATION_REQUEST_MSG_STRUCT));
@ -756,7 +756,7 @@ void nas::parse_authentication_request(uint32_t lcid, byte_buffer_t *pdu) {
if (auth_result == AUTH_OK) {
nas_log->info("Network authentication successful\n");
send_authentication_response(res, res_len);
send_authentication_response(res, res_len, sec_hdr_type);
nas_log->info("Generated k_asme=%s\n", hex_to_string(ctxt.k_asme, 32).c_str());
} else if (auth_result == AUTH_SYNCH_FAILURE) {
nas_log->error("Network authentication synchronization failure.\n");
@ -1129,9 +1129,9 @@ void nas::send_security_mode_reject(uint8_t cause) {
}
void nas::send_authentication_response(const uint8_t* res, const size_t res_len) {
byte_buffer_t *msg = pool_allocate;
if (!msg) {
void nas::send_authentication_response(const uint8_t* res, const size_t res_len, const uint8_t sec_hdr_type) {
byte_buffer_t *pdu = pool_allocate;
if (!pdu) {
nas_log->error("Fatal Error: Couldn't allocate PDU in send_authentication_response().\n");
return;
}
@ -1143,13 +1143,24 @@ void nas::send_authentication_response(const uint8_t* res, const size_t res_len)
auth_res.res[i] = res[i];
}
auth_res.res_len = res_len;
liblte_mme_pack_authentication_response_msg(&auth_res, (LIBLTE_BYTE_MSG_STRUCT *)msg);
liblte_mme_pack_authentication_response_msg(&auth_res, sec_hdr_type, ctxt.tx_count, (LIBLTE_BYTE_MSG_STRUCT *)pdu);
if(pcap != NULL) {
pcap->write_nas(msg->msg, msg->N_bytes);
pcap->write_nas(pdu->msg, pdu->N_bytes);
}
if (sec_hdr_type == LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY_AND_CIPHERED && pdu->N_bytes > 5) {
cipher_encrypt(pdu);
integrity_generate(&k_nas_int[16],
ctxt.tx_count,
SECURITY_DIRECTION_UPLINK,
&pdu->msg[5],
pdu->N_bytes - 5,
&pdu->msg[1]);
}
nas_log->info("Sending Authentication Response\n");
rrc->write_sdu(cfg.lcid, msg);
rrc->write_sdu(cfg.lcid, pdu);
}

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