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nrUE: handle security settings for SRB1 and reestablishment

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For the moment absoluteFrequencySSB is hardcoded. Fixed in a following commit.
This commit is contained in:
Cedric Roux
2024-03-13 17:59:08 +01:00
committed by francescomani
parent a0e9716a5a
commit 72e10a0ee6
1 changed files with 30 additions and 7 deletions
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openair2/RRC/NR_UE/rrc_UE.c
+30 -7
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@@ -619,7 +619,8 @@ static void nr_rrc_handle_msg3_indication(NR_UE_RRC_INST_t *rrc, rnti_t rnti)
nr_rlc_reestablish_entity(rrc->ue_id, lc_id);
// apply the specified configuration defined in 9.2.1 for SRB1
nr_rlc_reconfigure_entity(rrc->ue_id, lc_id, NULL);
// TODO configure lower layers to suspend integrity protection and ciphering for SRB1
// suspend integrity protection and ciphering for SRB1
nr_pdcp_config_set_security(rrc->ue_id, srb_id, 0, NULL, NULL, NULL);
// resume SRB1
rrc->Srb[srb_id] = RB_ESTABLISHED;
break;
@@ -1331,14 +1332,36 @@ static void nr_rrc_ue_process_rrcReestablishment(NR_UE_RRC_INST_t *rrc,
// store the nextHopChainingCount value
NR_RRCReestablishment_IEs_t *ies = rrcReestablishment->criticalExtensions.choice.rrcReestablishment;
AssertFatal(ies, "Not expecting RRCReestablishment_IEs to be NULL\n");
int nh = rrcReestablishment->criticalExtensions.choice.rrcReestablishment->nextHopChainingCount;
// TODO update the K gNB key based on the current K gNB key or the NH, using the stored nextHopChainingCount value
// TODO derive the K RRCenc and K UPenc keys associated with the previously configured cipheringAlgorithm
// TODO derive the K RRCint and K UPint keys associated with the previously configured integrityProtAlgorithm
// TODO need to understand how to use nextHopChainingCount
// int nh = rrcReestablishment->criticalExtensions.choice.rrcReestablishment->nextHopChainingCount;
// update the K gNB key based on the current K gNB key or the NH, using the stored nextHopChainingCount value
/* TODO: retrieve absoluteFrequencySSB correctly */
int absoluteFrequencySSB = 621312;
nr_derive_key_ng_ran_star(rrc->phyCellID, absoluteFrequencySSB, rrc->kgnb, rrc->kgnb);
// derive the K RRCenc and K UPenc keys associated with the previously configured cipheringAlgorithm
// derive the K RRCint and K UPint keys associated with the previously configured integrityProtAlgorithm
uint8_t kRRCenc[16] = {0};
uint8_t kRRCint[16] = {0};
uint8_t kUPenc[16] = {0};
uint8_t kUPint[16] = {0};
nr_derive_key(UP_ENC_ALG, rrc->cipheringAlgorithm, rrc->kgnb, kUPenc);
nr_derive_key(UP_INT_ALG, rrc->integrityProtAlgorithm, rrc->kgnb, kUPint);
nr_derive_key(RRC_ENC_ALG, rrc->cipheringAlgorithm, rrc->kgnb, kRRCenc);
nr_derive_key(RRC_INT_ALG, rrc->integrityProtAlgorithm, rrc->kgnb, kRRCint);
// 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
// TODO configure lower layers to resume integrity protection for SRB1
// TODO configure lower layers to resume ciphering for SRB1
// configure lower layers to resume integrity protection for SRB1
// configure lower layers to resume ciphering for SRB1
int srb_id = 1;
int security_mode = (rrc->integrityProtAlgorithm << 4)
| rrc->cipheringAlgorithm;
nr_pdcp_config_set_security(rrc->ue_id, srb_id, security_mode, kRRCenc, kRRCint, kUPenc);
// 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);