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sm: assert remote supports SMP over BR/EDR before CTKD

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This commit is contained in:
Matthias Ringwald 2023-05-10 15:14:40 +02:00
parent 7109ed1819
commit a036ae1224
2 changed files with 36 additions and 4 deletions
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39
src/ble/sm.c
View File

@ -275,8 +275,9 @@ static uint8_t sm_aes128_key[16];
static uint8_t sm_aes128_plaintext[16];
static uint8_t sm_aes128_ciphertext[16];
// to receive hci events
// to receive events
static btstack_packet_callback_registration_t hci_event_callback_registration;
static btstack_packet_callback_registration_t l2cap_event_callback_registration;
/* to dispatch sm event */
static btstack_linked_list_t sm_event_handlers;
@ -3946,13 +3947,23 @@ static void sm_event_packet_handler (uint8_t packet_type, uint16_t channel, uint
#ifdef ENABLE_CROSS_TRANSPORT_KEY_DERIVATION
case SM_BR_EDR_W4_ENCRYPTION_COMPLETE:
// CTKD requires BR/EDR Secure Connection
if (sm_conn->sm_connection_encrypted != 2) break;
// prepare for pairing request
if (IS_RESPONDER(sm_conn->sm_role)){
sm_conn->sm_engine_state = SM_BR_EDR_RESPONDER_W4_PAIRING_REQUEST;
} else if (sm_conn->sm_pairing_requested){
// only send LE pairing request after BR/EDR SSP
sm_conn->sm_engine_state = SM_BR_EDR_INITIATOR_SEND_PAIRING_REQUEST;
// check if remote supports fixed channels
const hci_connection_t * hci_connection = hci_connection_for_handle(con_handle);
if (hci_connection->l2cap_state.information_state == L2CAP_INFORMATION_STATE_DONE){
// check if remote supports SMP over BR/EDR
if ((hci_connection->l2cap_state.fixed_channels_supported & (1 << L2CAP_CID_BR_EDR_SECURITY_MANAGER)) != 0){
sm_conn->sm_engine_state = SM_BR_EDR_INITIATOR_SEND_PAIRING_REQUEST;
}
} else {
// wait for fixed channel info
sm_conn->sm_engine_state = SM_BR_EDR_INITIATOR_W4_FIXED_CHANNEL_MASK;
}
}
break;
#endif
@ -4022,6 +4033,22 @@ static void sm_event_packet_handler (uint8_t packet_type, uint16_t channel, uint
le_device_db_set_local_bd_addr(addr);
}
break;
#ifdef ENABLE_CROSS_TRANSPORT_KEY_DERIVATION
case L2CAP_EVENT_INFORMATION_RESPONSE:
con_handle = l2cap_event_information_response_get_con_handle(packet);
sm_conn = sm_get_connection_for_handle(con_handle);
if (!sm_conn) break;
if (sm_conn->sm_engine_state == SM_BR_EDR_INITIATOR_W4_FIXED_CHANNEL_MASK){
// check if remote supports SMP over BR/EDR
const hci_connection_t * hci_connection = hci_connection_for_handle(con_handle);
if ((hci_connection->l2cap_state.fixed_channels_supported & (1 << L2CAP_CID_BR_EDR_SECURITY_MANAGER)) != 0){
sm_conn->sm_engine_state = SM_BR_EDR_INITIATOR_SEND_PAIRING_REQUEST;
} else {
sm_conn->sm_engine_state = SM_INITIATOR_CONNECTED;
}
}
break;
#endif
default:
break;
}
@ -4853,10 +4880,14 @@ void sm_init(void){
// other
btstack_run_loop_set_timer_handler(&sm_run_timer, &sm_run_timer_handler);
// register for HCI Events from HCI
// register for HCI Events
hci_event_callback_registration.callback = &sm_event_packet_handler;
hci_add_event_handler(&hci_event_callback_registration);
// register for L2CAP events
l2cap_event_callback_registration.callback = &sm_event_packet_handler;
l2cap_add_event_handler(&l2cap_event_callback_registration);
//
btstack_crypto_init();

1
src/hci.h
View File

@ -409,6 +409,7 @@ typedef enum {
// Classic
SM_BR_EDR_W4_ENCRYPTION_COMPLETE,
SM_BR_EDR_INITIATOR_W4_FIXED_CHANNEL_MASK,
SM_BR_EDR_INITIATOR_SEND_PAIRING_REQUEST,
SM_BR_EDR_INITIATOR_W4_PAIRING_RESPONSE,
SM_BR_EDR_RESPONDER_W4_PAIRING_REQUEST,