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sm: derive BR/EDR key using peer address if address type is public in initiator role

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This commit is contained in:
Matthias Ringwald 2021-05-06 14:40:57 +02:00
parent ad20f0c8b0
commit 79b2612de5
1 changed files with 2 additions and 2 deletions
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4
src/ble/sm.c
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@ -3136,8 +3136,8 @@ static bool sm_ctkd_from_le(sm_connection_t *sm_connection) {
// - bonding needs to be enabled:
bool bonding_enabled = (sm_pairing_packet_get_auth_req(setup->sm_m_preq) & sm_pairing_packet_get_auth_req(setup->sm_s_pres) & SM_AUTHREQ_BONDING ) != 0u;
if (!bonding_enabled) return false;
// - need identity address
bool have_identity_address_info = ((setup->sm_key_distribution_received_set & SM_KEYDIST_FLAG_IDENTITY_ADDRESS_INFORMATION) != 0);
// - need identity address / public addr
bool have_identity_address_info = ((setup->sm_key_distribution_received_set & SM_KEYDIST_FLAG_IDENTITY_ADDRESS_INFORMATION) != 0) || (setup->sm_peer_addr_type == 0);
if (!have_identity_address_info) return false;
// - there is no stored BR/EDR link key or the derived key has at least the same level of authentication (bail if stored key has higher authentication)
// this requirement is motivated by BLURtooth paper. The paper recommends to not overwrite keys at all.