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gnb,rrc: refactor AS security updates

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refactor security updater to extra function and make sure
the config is applied to all active RBs, also DRBs
master
Andre Puschmann 3 years ago
parent d035a57ed5
commit 366dfca7ff
3 changed files with 59 additions and 28 deletions
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3
srsgnb/hdr/stack/rrc/rrc_nr_ue.h
Unescape Escape View File

@ -108,6 +108,9 @@ private:
/// Update MAC based on ASN1 message
int update_mac(const asn1::rrc_nr::cell_group_cfg_s& cell_group_config, bool is_config_complete);
/// Update AS security config on active RB
int update_as_security(uint32_t lcid, bool enable_integrity, bool enable_ciphering);
int pack_rrc_reconfiguration(asn1::dyn_octstring& packed_rrc_reconfig);
int pack_secondary_cell_group_cfg(asn1::dyn_octstring& packed_secondary_cell_config);

83
srsgnb/src/stack/rrc/rrc_nr_ue.cc
Unescape Escape View File

@ -1108,20 +1108,8 @@ void rrc_nr::ue::handle_rrc_setup_complete(const asn1::rrc_nr::rrc_setup_complet
/// TS 38.331, SecurityModeCommand
void rrc_nr::ue::send_security_mode_command(srsran::unique_byte_buffer_t nas_pdu)
{
// FIXME: Currently we are using the PDCP-LTE, so we need to convert from nr_as_security_cfg to as_security_config.
// When we start using PDCP-NR we can avoid this step.
srsran::nr_as_security_config_t tmp_cnfg = sec_ctx.get_as_sec_cfg();
srsran::as_security_config_t pdcp_cnfg = {};
pdcp_cnfg.k_rrc_int = tmp_cnfg.k_nr_rrc_int;
pdcp_cnfg.k_rrc_enc = tmp_cnfg.k_nr_rrc_enc;
pdcp_cnfg.k_up_int = tmp_cnfg.k_nr_up_int;
pdcp_cnfg.k_up_enc = tmp_cnfg.k_nr_up_enc;
pdcp_cnfg.integ_algo = (srsran::INTEGRITY_ALGORITHM_ID_ENUM)tmp_cnfg.integ_algo;
pdcp_cnfg.cipher_algo = (srsran::CIPHERING_ALGORITHM_ID_ENUM)tmp_cnfg.cipher_algo;
// Setup SRB1 security/integrity. Encryption is set on completion
parent->pdcp->config_security(rnti, srb_to_lcid(srsran::nr_srb::srb1), pdcp_cnfg);
parent->pdcp->enable_integrity(rnti, srb_to_lcid(srsran::nr_srb::srb1));
// apply selected security config and enable integrity on SRB1 before generating security mode command
update_as_security(srb_to_lcid(srsran::nr_srb::srb1), true, false);
if (nas_pdu != nullptr) {
nas_pdu_queue.push_back(std::move(nas_pdu));
@ -1139,11 +1127,58 @@ void rrc_nr::ue::send_security_mode_command(srsran::unique_byte_buffer_t nas_pdu
}
}
/**
* @brief Internal helper to update the security configuration of a PDCP bearer
*
* If no valid AS security config is present (yet) the method doesn't modify the
* PDCP config and returns SRSRAN_ERROR. In some cases, however,
* for example during RRC Setup, this is in fact the expected behaviour as
* AS security isn't established yet.
*
* @param lcid Logical channel ID of the bearer
* @param enable_integrity Whether to enable integrity protection for the bearer
* @param enable_ciphering Whether to enable ciphering for the bearer
* @return int SRSRAN_SUCCESS if a valid AS security config was found and the security was configured
*/
int rrc_nr::ue::update_as_security(uint32_t lcid, bool enable_integrity = true, bool enable_ciphering = true)
{
if (not sec_ctx.is_as_sec_cfg_valid()) {
parent->logger.error("Invalid AS security configuration. Skipping configuration for lcid=%d", lcid);
return SRSRAN_ERROR;
}
// FIXME: Currently we are using the PDCP-LTE, so we need to convert from nr_as_security_cfg to as_security_config.
// When we start using PDCP-NR we can avoid this step.
srsran::nr_as_security_config_t tmp_cnfg = sec_ctx.get_as_sec_cfg();
srsran::as_security_config_t pdcp_cnfg = {};
pdcp_cnfg.k_rrc_int = tmp_cnfg.k_nr_rrc_int;
pdcp_cnfg.k_rrc_enc = tmp_cnfg.k_nr_rrc_enc;
pdcp_cnfg.k_up_int = tmp_cnfg.k_nr_up_int;
pdcp_cnfg.k_up_enc = tmp_cnfg.k_nr_up_enc;
pdcp_cnfg.integ_algo = (srsran::INTEGRITY_ALGORITHM_ID_ENUM)tmp_cnfg.integ_algo;
pdcp_cnfg.cipher_algo = (srsran::CIPHERING_ALGORITHM_ID_ENUM)tmp_cnfg.cipher_algo;
// configure algorithm and keys
parent->pdcp->config_security(rnti, lcid, pdcp_cnfg);
if (enable_integrity) {
parent->pdcp->enable_integrity(rnti, lcid);
}
if (enable_ciphering) {
parent->pdcp->enable_encryption(rnti, lcid);
}
return SRSRAN_SUCCESS;
}
/// TS 38.331, SecurityModeComplete
void rrc_nr::ue::handle_security_mode_complete(const asn1::rrc_nr::security_mode_complete_s& msg)
{
parent->logger.info("SecurityModeComplete transaction ID: %d", msg.rrc_transaction_id);
parent->pdcp->enable_encryption(rnti, srb_to_lcid(srsran::nr_srb::srb1));
// finally, also enable ciphering on SRB1
update_as_security(srb_to_lcid(srsran::nr_srb::srb1), false, true);
send_rrc_reconfiguration();
// Note: Skip UE capabilities
@ -1357,20 +1392,8 @@ int rrc_nr::ue::update_pdcp_bearers(const asn1::rrc_nr::radio_bearer_cfg_s& radi
}
parent->pdcp->add_bearer(rnti, rlc_bearer->lc_ch_id, pdcp_cnfg);
// enable security config
if (sec_ctx.is_as_sec_cfg_valid()) {
srsran::nr_as_security_config_t tmp_cnfg = sec_ctx.get_as_sec_cfg();
srsran::as_security_config_t pdcp_cnfg = {};
pdcp_cnfg.k_rrc_int = tmp_cnfg.k_nr_rrc_int;
pdcp_cnfg.k_rrc_enc = tmp_cnfg.k_nr_rrc_enc;
pdcp_cnfg.k_up_int = tmp_cnfg.k_nr_up_int;
pdcp_cnfg.k_up_enc = tmp_cnfg.k_nr_up_enc;
pdcp_cnfg.integ_algo = (srsran::INTEGRITY_ALGORITHM_ID_ENUM)tmp_cnfg.integ_algo;
pdcp_cnfg.cipher_algo = (srsran::CIPHERING_ALGORITHM_ID_ENUM)tmp_cnfg.cipher_algo;
// Setup SRB1 security/integrity. Encryption is set on completion
parent->pdcp->config_security(rnti, srb_to_lcid(srsran::nr_srb::srb1), pdcp_cnfg);
parent->pdcp->enable_integrity(rnti, srb_to_lcid(srsran::nr_srb::srb1));
update_as_security(rlc_bearer->lc_ch_id);
}
}
@ -1390,6 +1413,10 @@ int rrc_nr::ue::update_pdcp_bearers(const asn1::rrc_nr::radio_bearer_cfg_s& radi
return SRSRAN_ERROR;
}
parent->pdcp->add_bearer(rnti, rlc_bearer->lc_ch_id, pdcp_cnfg);
if (sec_ctx.is_as_sec_cfg_valid()) {
update_as_security(rlc_bearer->lc_ch_id);
}
}
return SRSRAN_SUCCESS;

1
srsgnb/src/stack/rrc/test/rrc_nr_test.cc
Unescape Escape View File

@ -170,6 +170,7 @@ void test_rrc_sa_connection()
SRSRAN_SUCCESS);
TESTASSERT_SUCCESS(rrc_obj.add_user(0x4601, 0));
TESTASSERT_SUCCESS(rrc_obj.ue_set_security_cfg_key(0x4601, {}));
test_rrc_nr_connection_establishment(task_sched, rrc_obj, rlc_obj, mac_obj, ngap_obj, 0x4601);
test_rrc_nr_info_transfer(task_sched, rrc_obj, pdcp_obj, ngap_obj, 0x4601);

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