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sm: only derive LTK if both sides set EncKey bit

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This commit is contained in:
Matthias Ringwald 2023-07-13 18:19:07 +02:00
parent 6a718a5e93
commit 13aed524df
1 changed files with 10 additions and 3 deletions
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13
src/ble/sm.c
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@ -2083,9 +2083,16 @@ static void sm_ctkd_fetch_br_edr_link_key(sm_connection_t * sm_conn){
setup->sm_link_key_type = hci_connection->link_key_type;
}
static void sm_ctkd_start_from_br_edr(sm_connection_t * connection){
bool use_h7 = (sm_pairing_packet_get_auth_req(setup->sm_m_preq) & sm_pairing_packet_get_auth_req(setup->sm_s_pres) & SM_AUTHREQ_CT2) != 0;
connection->sm_engine_state = use_h7 ? SM_BR_EDR_W2_CALCULATE_ILK_USING_H7 : SM_BR_EDR_W2_CALCULATE_ILK_USING_H6;
static void sm_ctkd_start_from_br_edr(sm_connection_t * sm_conn){
// only derive LTK if EncKey is set by both
bool derive_ltk = (sm_pairing_packet_get_initiator_key_distribution(setup->sm_s_pres) &
sm_pairing_packet_get_responder_key_distribution(setup->sm_s_pres) & SM_KEYDIST_ENC_KEY) != 0;
if (derive_ltk){
bool use_h7 = (sm_pairing_packet_get_auth_req(setup->sm_m_preq) & sm_pairing_packet_get_auth_req(setup->sm_s_pres) & SM_AUTHREQ_CT2) != 0;
sm_conn->sm_engine_state = use_h7 ? SM_BR_EDR_W2_CALCULATE_ILK_USING_H7 : SM_BR_EDR_W2_CALCULATE_ILK_USING_H6;
} else {
sm_done_for_handle(sm_conn->sm_handle);
}
}
#endif