Lionel Gauthier
b4b55c9f28
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7186 818b1a75-f10b-46b9-bf7c-635c3b92a50f
258 lines
8.7 KiB
C
258 lines
8.7 KiB
C
/*******************************************************************************
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OpenAirInterface
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Copyright(c) 1999 - 2014 Eurecom
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OpenAirInterface is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenAirInterface is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OpenAirInterface.The full GNU General Public License is
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included in this distribution in the file called "COPYING". If not,
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see <http://www.gnu.org/licenses/>.
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Contact Information
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OpenAirInterface Admin: openair_admin@eurecom.fr
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OpenAirInterface Tech : openair_tech@eurecom.fr
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OpenAirInterface Dev : openair4g-devel@eurecom.fr
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Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
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*******************************************************************************/
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/*! \file pdcp_security.c
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* \brief PDCP Security Methods
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* \author ROUX Sebastie and Navid Nikaein
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* \email openair_tech@eurecom.fr, navid.nikaein@eurecom.fr
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* \date 2014
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*/
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#include <stdint.h>
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#include "assertions.h"
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#include "UTIL/LOG/log.h"
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#include "UTIL/OSA/osa_defs.h"
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#include "UTIL/LOG/vcd_signal_dumper.h"
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#include "LAYER2/MAC/extern.h"
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#include "pdcp.h"
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#include "msc.h"
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#include "pdcp_primitives.h"
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#if defined(ENABLE_SECURITY)
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static
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uint32_t pdcp_get_next_count_tx(pdcp_t *const pdcp_pP, const srb_flag_t srb_flagP, const uint16_t pdcp_sn);
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static
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uint32_t pdcp_get_next_count_rx(pdcp_t *const pdcp_pP, const srb_flag_t srb_flagP, const uint16_t pdcp_sn);
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//-----------------------------------------------------------------------------
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static
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uint32_t pdcp_get_next_count_tx(
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pdcp_t * const pdcp_pP,
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const srb_flag_t srb_flagP,
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const uint16_t pdcp_sn
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)
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{
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uint32_t count;
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/* For TX COUNT = TX_HFN << length of SN | pdcp SN */
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if (srb_flagP) {
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/* 5 bits length SN */
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count = ((pdcp_pP->tx_hfn << 5) | (pdcp_sn & 0x001F));
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} else {
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if (pdcp_pP->seq_num_size == PDCP_Config__rlc_UM__pdcp_SN_Size_len7bits) {
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count = ((pdcp_pP->tx_hfn << 7) | (pdcp_sn & 0x07F));
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} else { /*Default is the 12 bits length SN */
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count = ((pdcp_pP->tx_hfn << 12) | (pdcp_sn & 0x0FFF));
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}
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}
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LOG_D(PDCP, "[OSA] TX COUNT = 0x%08x\n", count);
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return count;
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}
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//-----------------------------------------------------------------------------
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static
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uint32_t pdcp_get_next_count_rx(
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pdcp_t * const pdcp_pP,
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const srb_flag_t srb_flagP,
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const uint16_t pdcp_sn)
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{
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uint32_t count;
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/* For RX COUNT = RX_HFN << length of SN | pdcp SN of received PDU */
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if (srb_flagP) {
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/* 5 bits length SN */
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count = (((pdcp_pP->rx_hfn + pdcp_pP->rx_hfn_offset) << 5) | (pdcp_sn & 0x001F));
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} else {
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if (pdcp_pP->seq_num_size == PDCP_Config__rlc_UM__pdcp_SN_Size_len7bits) {
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/* 7 bits length SN */
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count = (((pdcp_pP->rx_hfn + pdcp_pP->rx_hfn_offset) << 7) | (pdcp_sn & 0x007F));
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} else { // default
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/* 12 bits length SN */
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count = (((pdcp_pP->rx_hfn + pdcp_pP->rx_hfn_offset) << 12) | (pdcp_sn & 0x0FFF));
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}
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}
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// reset the hfn offset
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pdcp_pP->rx_hfn_offset =0;
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LOG_D(PDCP, "[OSA] RX COUNT = 0x%08x\n", count);
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return count;
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}
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//-----------------------------------------------------------------------------
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int
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pdcp_apply_security(
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const protocol_ctxt_t* const ctxt_pP,
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pdcp_t *const pdcp_pP,
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const srb_flag_t srb_flagP,
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const rb_id_t rb_id,
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const uint8_t pdcp_header_len,
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const uint16_t current_sn,
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uint8_t * const pdcp_pdu_buffer,
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const uint16_t sdu_buffer_size
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)
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{
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uint8_t *buffer_encrypted = NULL;
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stream_cipher_t encrypt_params;
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DevAssert(pdcp_pP != NULL);
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DevAssert(pdcp_pdu_buffer != NULL);
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DevCheck(rb_id < NB_RB_MAX && rb_id >= 0, rb_id, NB_RB_MAX, 0);
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VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCP_APPLY_SECURITY, VCD_FUNCTION_IN);
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encrypt_params.direction = (pdcp_pP->is_ue == 1) ? SECU_DIRECTION_UPLINK : SECU_DIRECTION_DOWNLINK;
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encrypt_params.bearer = rb_id - 1;
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encrypt_params.count = pdcp_get_next_count_tx(pdcp_pP, srb_flagP, current_sn);
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encrypt_params.key_length = 16;
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if (srb_flagP) {
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/* SRBs */
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uint8_t *mac_i;
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LOG_D(PDCP, "[OSA][RB %d] %s Applying control-plane security %d \n",
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rb_id, (pdcp_pP->is_ue != 0) ? "UE -> eNB" : "eNB -> UE", pdcp_pP->integrityProtAlgorithm);
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encrypt_params.message = pdcp_pdu_buffer;
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encrypt_params.blength = (pdcp_header_len + sdu_buffer_size) << 3;
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encrypt_params.key = pdcp_pP->kRRCint + 16; // + 128;
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mac_i = &pdcp_pdu_buffer[pdcp_header_len + sdu_buffer_size];
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/* Both header and data parts are integrity protected for
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* control-plane PDUs */
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stream_compute_integrity(pdcp_pP->integrityProtAlgorithm,
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&encrypt_params,
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mac_i);
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encrypt_params.key = pdcp_pP->kRRCenc; // + 128 // bit key
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} else {
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LOG_D(PDCP, "[OSA][RB %d] %s Applying user-plane security\n",
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rb_id, (pdcp_pP->is_ue != 0) ? "UE -> eNB" : "eNB -> UE");
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encrypt_params.key = pdcp_pP->kUPenc;// + 128;
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}
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encrypt_params.message = &pdcp_pdu_buffer[pdcp_header_len];
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encrypt_params.blength = sdu_buffer_size << 3;
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buffer_encrypted = &pdcp_pdu_buffer[pdcp_header_len];
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/* Apply ciphering if any requested */
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stream_encrypt(pdcp_pP->cipheringAlgorithm,
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&encrypt_params,
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&buffer_encrypted);
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VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCP_APPLY_SECURITY, VCD_FUNCTION_OUT);
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return 0;
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}
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//-----------------------------------------------------------------------------
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int
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pdcp_validate_security(
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const protocol_ctxt_t* const ctxt_pP,
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pdcp_t * const pdcp_pP,
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const srb_flag_t srb_flagP,
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const rb_id_t rb_id,
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const uint8_t pdcp_header_len,
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const uint16_t current_sn,
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uint8_t *const pdcp_pdu_buffer,
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const uint16_t sdu_buffer_size
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)
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{
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uint8_t *buffer_decrypted = NULL;
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stream_cipher_t decrypt_params;
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DevAssert(pdcp_pP != NULL);
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DevAssert(pdcp_pdu_buffer != NULL);
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DevCheck(rb_id < NB_RB_MAX && rb_id >= 0, rb_id, NB_RB_MAX, 0);
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VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCP_VALIDATE_SECURITY, VCD_FUNCTION_IN);
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buffer_decrypted = (uint8_t*)&pdcp_pdu_buffer[pdcp_header_len];
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decrypt_params.direction = (pdcp_pP->is_ue == 1) ? SECU_DIRECTION_DOWNLINK : SECU_DIRECTION_UPLINK ;
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decrypt_params.bearer = rb_id - 1;
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decrypt_params.count = pdcp_get_next_count_rx(pdcp_pP, srb_flagP, current_sn);
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decrypt_params.message = &pdcp_pdu_buffer[pdcp_header_len];
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decrypt_params.blength = (sdu_buffer_size - pdcp_header_len) << 3;
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decrypt_params.key_length = 16;
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if (srb_flagP) {
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LOG_D(PDCP, "[OSA][RB %d] %s Validating control-plane security\n",
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rb_id, (pdcp_pP->is_ue != 0) ? "eNB -> UE" : "UE -> eNB");
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decrypt_params.key = pdcp_pP->kRRCenc;// + 128;
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} else {
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LOG_D(PDCP, "[OSA][RB %d] %s Validating user-plane security\n",
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rb_id, (pdcp_pP->is_ue != 0) ? "eNB -> UE" : "UE -> eNB");
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decrypt_params.key = pdcp_pP->kUPenc;// + 128;
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}
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/* Uncipher the block */
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stream_decrypt(pdcp_pP->cipheringAlgorithm,
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&decrypt_params,
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&buffer_decrypted);
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if (srb_flagP) {
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/* Now check the integrity of the complete PDU */
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decrypt_params.message = pdcp_pdu_buffer;
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decrypt_params.blength = sdu_buffer_size << 3;
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decrypt_params.key = pdcp_pP->kRRCint + 16;// 128;
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if (stream_check_integrity(pdcp_pP->integrityProtAlgorithm,
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&decrypt_params,
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&pdcp_pdu_buffer[sdu_buffer_size]) != 0) {
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MSC_LOG_EVENT(
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(ctxt_pP->enb_flag == ENB_FLAG_YES) ? MSC_PDCP_ENB:MSC_PDCP_UE,
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" Security: failed MAC-I Algo %X UE %"PRIx16" ",
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pdcp_pP->integrityProtAlgorithm,
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ctxt_pP->rnti);
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LOG_E(PDCP, "[OSA][RB %d] %s failed to validate MAC-I of incoming PDU\n",
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rb_id, (pdcp_pP->is_ue != 0) ? "UE" : "eNB");
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VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCP_VALIDATE_SECURITY, VCD_FUNCTION_OUT);
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return -1;
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}
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}
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VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCP_VALIDATE_SECURITY, VCD_FUNCTION_OUT);
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return 0;
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}
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#endif /* ENABLE_SECURITY */
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