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Merge remote-tracking branch 'origin/RRCReestablishment_integrity' into integration_2025_w05 (!3229)

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Verify the integrity protection of the RRCReestablishment message
This commit is contained in:
Robert Schmidt
2025-01-31 08:07:26 +01:00
parent 44fe1175c2 7c93de87a4
commit 85edbc8ec7
1 changed files with 28 additions and 10 deletions
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openair2/RRC/NR_UE/rrc_UE.c
+28 -10
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@@ -1749,7 +1749,11 @@ static void nr_rrc_ue_generate_RRCReconfigurationComplete(NR_UE_RRC_INST_t *rrc,
static void nr_rrc_ue_process_rrcReestablishment(NR_UE_RRC_INST_t *rrc,
const int gNB_index,
const NR_RRCReestablishment_t *rrcReestablishment)
const NR_RRCReestablishment_t *rrcReestablishment,
int srb_id,
const uint8_t *msg,
int msg_size,
const nr_pdcp_integrity_data_t *msg_integrity)
{
// implementign procedues as described in 38.331 section 5.3.7.5
// stop timer T301
@@ -1764,22 +1768,31 @@ static void nr_rrc_ue_process_rrcReestablishment(NR_UE_RRC_INST_t *rrc,
// update the K gNB key based on the current K gNB key or the NH, using the stored nextHopChainingCount value
nr_derive_key_ng_ran_star(rrc->phyCellID, rrc->arfcn_ssb, rrc->kgnb, rrc->kgnb);
// derive the K RRCenc key associated with the previously configured cipheringAlgorithm
// derive the K RRCint key associated with the previously configured integrityProtAlgorithm
// derive the K_RRCenc key associated with the previously configured cipheringAlgorithm
// derive the K_RRCint key associated with the previously configured integrityProtAlgorithm
nr_pdcp_entity_security_keys_and_algos_t security_parameters;
security_parameters.ciphering_algorithm = rrc->cipheringAlgorithm;
security_parameters.integrity_algorithm = rrc->integrityProtAlgorithm;
nr_derive_key(RRC_ENC_ALG, rrc->cipheringAlgorithm, rrc->kgnb, security_parameters.ciphering_key);
nr_derive_key(RRC_INT_ALG, rrc->integrityProtAlgorithm, rrc->kgnb, security_parameters.integrity_key);
// TODO request lower layers to verify the integrity protection of the RRCReestablishment message
// TODO if the integrity protection check of the RRCReestablishment message fails -> go to IDLE
// configure lower layers to resume integrity protection for SRB1
// configure lower layers to resume ciphering for SRB1
int srb_id = 1;
AssertFatal(srb_id == 1, "rrcReestablishment SRB-ID %d, should be 1\n", srb_id);
nr_pdcp_config_set_security(rrc->ue_id, srb_id, true, &security_parameters);
// request lower layers to verify the integrity protection of the RRCReestablishment message
// using the previously configured algorithm and the K_RRCint key
bool integrity_pass = nr_pdcp_check_integrity_srb(rrc->ue_id, srb_id, msg, msg_size, msg_integrity);
// if the integrity protection check of the RRCReestablishment message fails
// perform the actions upon going to RRC_IDLE as specified in 5.3.11
// with release cause 'RRC connection failure', upon which the procedure ends
if (!integrity_pass) {
NR_Release_Cause_t release_cause = RRC_CONNECTION_FAILURE;
nr_rrc_going_to_IDLE(rrc, release_cause, NULL);
return;
}
// release the measurement gap configuration indicated by the measGapConfig, if configured
rrcPerNB_t *rrcNB = rrc->perNB + gNB_index;
asn1cFreeStruc(asn_DEF_NR_MeasGapConfig, rrcNB->measGapConfig);
@@ -1860,7 +1873,13 @@ static int nr_rrc_ue_decode_dcch(NR_UE_RRC_INST_t *rrc,
case NR_DL_DCCH_MessageType__c1_PR_rrcReestablishment:
LOG_I(NR_RRC, "Logical Channel DL-DCCH (SRB1), Received RRCReestablishment\n");
nr_rrc_ue_process_rrcReestablishment(rrc, gNB_indexP, c1->choice.rrcReestablishment);
nr_rrc_ue_process_rrcReestablishment(rrc,
gNB_indexP,
c1->choice.rrcReestablishment,
Srb_id,
Buffer,
Buffer_size,
msg_integrity);
break;
case NR_DL_DCCH_MessageType__c1_PR_dlInformationTransfer: {
@@ -1894,8 +1913,7 @@ static int nr_rrc_ue_decode_dcch(NR_UE_RRC_INST_t *rrc,
break;
case NR_DL_DCCH_MessageType__c1_PR_securityModeCommand:
LOG_I(NR_RRC, "Received securityModeCommand (gNB %d)\n", gNB_indexP);
nr_rrc_ue_process_securityModeCommand(rrc, c1->choice.securityModeCommand,
Srb_id, Buffer, Buffer_size, msg_integrity);
nr_rrc_ue_process_securityModeCommand(rrc, c1->choice.securityModeCommand, Srb_id, Buffer, Buffer_size, msg_integrity);
break;
}
} break;