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enable key distribution again, check for empty ediv and random in ltk request, work around sending set advertise enable twice in a row

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matthias.ringwald@gmail.com 2013-11-29 10:38:59 +00:00
parent 9416e46f10
commit 86452e281a
1 changed files with 35 additions and 7 deletions
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42
example/libusb/ble_server.c
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@ -115,6 +115,7 @@ typedef enum {
SM_STATE_IDLE,
SM_STATE_SEND_SECURITY_REQUEST,
SM_STATE_SEND_LTK_REQUESTED_NEGATIVE_REPLY,
// Phase 1: Pairing Feature Exchange
@ -280,6 +281,7 @@ static bd_addr_t sm_m_address;
static key_t sm_m_csrk;
static key_t sm_m_irk;
// @returns 1 if oob data is available
// stores oob data in provided 16 byte buffer if not null
static int (*sm_get_oob_data)(uint8_t addres_type, bd_addr_t * addr, uint8_t * oob_data) = NULL;
@ -322,6 +324,16 @@ static inline void swap128(uint8_t src[16], uint8_t dst[16]){
swapX(src, dst, 16);
}
// @returns 1 if all bytes are 0
static int sm_is_null_random(uint8_t random[8]){
int i;
for (i=0; i < 8 ; i++){
if (random[i]) return 0;
}
return 1;
}
static void print_key(const char * name, key_t key){
printf("%-6s ", name);
hexdump(key, 16);
@ -497,6 +509,11 @@ static void sm_run(void){
return;
}
case SM_STATE_SEND_LTK_REQUESTED_NEGATIVE_REPLY:
hci_send_cmd(&hci_le_long_term_key_negative_reply, sm_response_handle);
sm_state_responding = SM_STATE_IDLE;
return;
case SM_STATE_SEND_PAIRING_FAILED: {
uint8_t buffer[2];
buffer[0] = SM_CODE_PAIRING_FAILED;
@ -789,10 +806,10 @@ static void packet_handler (void * connection, uint8_t packet_type, uint16_t cha
break;
case HCI_SUBEVENT_LE_LONG_TERM_KEY_REQUEST:
log_info("LTK Request, state %u", sm_state_responding);
log_info("LTK Request: state %u", sm_state_responding);
if (sm_state_responding == SM_STATE_PH2_W4_LTK_REQUEST){
// calculate STK
log_info("calculating STK");
log_info("LTK Request: calculating STK");
// key_t sm_stk;
// sm_s1(sm_tk, sm_s_random, sm_m_random, sm_stk);
sm_aes128_set_key(sm_tk);
@ -802,10 +819,18 @@ static void packet_handler (void * connection, uint8_t packet_type, uint16_t cha
}
// re-establish previously used LTK using Rand and EDIV
log_info("recalculating LTK");
swap64(&packet[5], sm_s_rand);
sm_s_ediv = READ_BT_16(packet, 13);
// assume that we don't have a LTK for ediv == 0 and random == null
if (sm_s_ediv == 0 && sm_is_null_random(sm_s_rand)){
printf("LTK Request: ediv & random are empty\n");
sm_state_responding = SM_STATE_SEND_LTK_REQUESTED_NEGATIVE_REPLY;
break;
}
log_info("LTK Request: recalculating with ediv 0x%04x", sm_s_ediv);
// dhk = d1(IR, 1, 0) - enc
// y = dm(dhk, rand) - enc
// div = y xor ediv
@ -833,11 +858,14 @@ static void packet_handler (void * connection, uint8_t packet_type, uint16_t cha
break;
case HCI_EVENT_DISCONNECTION_COMPLETE:
// restart advertising if we have been connected before
// -> avoid sending advertise enable a second time before command complete was received
if (att_response_handle) {
hci_send_cmd(&hci_le_set_advertise_enable, 1);
}
att_response_handle = 0;
att_response_size = 0;
// restart advertising
hci_send_cmd(&hci_le_set_advertise_enable, 1);
break;
case HCI_EVENT_COMMAND_COMPLETE:
@ -946,7 +974,7 @@ static void packet_handler (void * connection, uint8_t packet_type, uint16_t cha
// distribute keys
sm_distribute_keys();
// done
sm_state_responding = SM_STATE_IDLE;
sm_state_responding = SM_STATE_DISTRIBUTE_KEYS;
break;
case SM_STATE_PH4_LTK_W4_ENC:
swap128(&packet[6], sm_s_ltk);