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sm: on LTK request, if ediv or rand no null, start calculating LTK for legacy pairing. If ediv or rand not null, check le device db for LTK if SC are enabled on LTK

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This commit is contained in:
Matthias Ringwald 2016-06-24 17:24:35 +02:00
parent 59066796a6
commit 549ad5d20f
1 changed files with 28 additions and 11 deletions
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39
src/ble/sm.c
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@ -1942,22 +1942,25 @@ static void sm_run(void){
sm_connection->sm_engine_state = SM_INITIATOR_PH0_SEND_START_ENCRYPTION;
break;
case SM_RESPONDER_PH0_RECEIVED_LTK_REQUEST:
#ifdef ENABLE_LE_SECURE_CONNECTIONS
switch (sm_connection->sm_irk_lookup_state){
case IRK_LOOKUP_SUCCEEDED:{
sm_load_security_info(sm_connection);
case IRK_LOOKUP_SUCCEEDED:
// assuming Secure Connection, we have a stored LTK and the EDIV/RAND are null
sm_load_security_info(sm_connection);
if (setup->sm_peer_ediv == 0 && sm_is_null_random(setup->sm_peer_rand) && !sm_is_null_key(setup->sm_peer_ltk)){
sm_connection->sm_engine_state = SM_RESPONDER_PH2_SEND_LTK_REPLY;
break;
}
log_info("LTK Request: ediv & random are empty, but no stored LTK (IRK Lookup Succeeded)");
sm_connection->sm_engine_state = SM_RESPONDER_PH0_SEND_LTK_REQUESTED_NEGATIVE_REPLY;
// don't lock setup context yet
done = 0;
break;
case IRK_LOOKUP_FAILED:
// assume that we don't have a LTK for ediv == 0 and random == null
if (sm_connection->sm_local_ediv == 0 && sm_is_null_random(sm_connection->sm_local_rand)){
log_info("LTK Request: ediv & random are empty");
sm_connection->sm_engine_state = SM_RESPONDER_PH0_SEND_LTK_REQUESTED_NEGATIVE_REPLY;
// TODO: no need to lock context yet -> done = 0;
break;
}
// re-establish previously used LTK using Rand and EDIV
sm_start_calculating_ltk_from_ediv_and_rand(sm_connection);
log_info("LTK Request: ediv & random are empty, but no stored LTK (IRK Lookup Failed)");
sm_connection->sm_engine_state = SM_RESPONDER_PH0_SEND_LTK_REQUESTED_NEGATIVE_REPLY;
// don't lock setup context yet
done = 0;
break;
default:
// just wait until IRK lookup is completed
@ -1965,6 +1968,7 @@ static void sm_run(void){
done = 0;
break;
}
#endif
break;
case SM_INITIATOR_PH1_W2_SEND_PAIRING_REQUEST:
sm_init_setup(sm_connection);
@ -2882,7 +2886,20 @@ static void sm_event_packet_handler (uint8_t packet_type, uint16_t channel, uint
// store rand and ediv
reverse_64(&packet[5], sm_conn->sm_local_rand);
sm_conn->sm_local_ediv = little_endian_read_16(packet, 13);
// For Legacy Pairing (<=> EDIV != 0 || RAND != NULL), we need to recalculated our LTK as a
// potentially stored LTK is from the master
if (sm_conn->sm_local_ediv != 0 || !sm_is_null_random(sm_conn->sm_local_rand)){
sm_start_calculating_ltk_from_ediv_and_rand(sm_conn);
break;
}
#ifdef ENABLE_LE_SECURE_CONNECTIONS
sm_conn->sm_engine_state = SM_RESPONDER_PH0_RECEIVED_LTK_REQUEST;
#else
log_info("LTK Request: ediv & random are empty, but LE Secure Connections not supported");
sm_conn->sm_engine_state = SM_RESPONDER_PH0_SEND_LTK_REQUESTED_NEGATIVE_REPLY;
#endif
break;
default: