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add SMP Timeout

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matthias.ringwald@gmail.com 2013-11-29 20:57:55 +00:00
parent e562e8b5c2
commit 08066884c0
1 changed files with 53 additions and 0 deletions
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53
example/libusb/ble_server.c
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@ -199,6 +199,8 @@ typedef enum {
SM_STATE_PH4_LTK_W4_ENC,
SM_STATE_PH4_SEND_LTK,
SM_STATE_TIMEOUT, // no other security messages are exchanged
} security_manager_state_t;
typedef enum {
@ -236,6 +238,8 @@ static key_t sm_persistent_irk;
// derived from sm_persistent_er
// SM timeout
static timer_source_t sm_timeout;
// data to send to aes128 crypto engine, see sm_aes128_set_key and sm_aes128_set_plaintext
static key_t sm_aes128_key;
@ -366,6 +370,37 @@ static void print_hex16(const char * name, uint16_t value){
printf("%-6s 0x%04x\n", name, value);
}
// SMP Timeout implementation
// Upon transmission of the Pairing Request command or reception of the Pairing Request command,
// the Security Manager Timer shall be reset and started.
//
// The Security Manager Timer shall be reset when an L2CAP SMP command is queued for transmission.
//
// If the Security Manager Timer reaches 30 seconds, the procedure shall be considered to have failed,
// and the local higher layer shall be notified. No further SMP commands shall be sent over the L2CAP
// Security Manager Channel. A new SM procedure shall only be performed when a new physical link has been
// established.
static void sm_timeout_handler(timer_source_t * timer){
printf("SM timeout");
sm_state_responding = SM_STATE_TIMEOUT;
}
static void sm_timeout_start(){
run_loop_set_timer_handler(&sm_timeout, sm_timeout_handler);
run_loop_set_timer(&sm_timeout, 30000); // 30 seconds sm timeout
run_loop_add_timer(&sm_timeout);
}
static void sm_timeout_stop(){
run_loop_remove_timer(&sm_timeout);
}
static void sm_timeout_reset(){
sm_timeout_stop();
sm_timeout_start();
}
// end of sm timeout
static inline void sm_aes128_set_key(key_t key){
memcpy(sm_aes128_key, key, 16);
}
@ -539,6 +574,7 @@ static void sm_run(void){
memcpy(sm_pres, buffer, 7);
l2cap_send_connectionless(sm_response_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer));
sm_timeout_reset();
// notify client for: JUST WORKS confirm, PASSKEY display or input
sm_user_response = SM_USER_RESPONSE_IDLE;
@ -581,6 +617,7 @@ static void sm_run(void){
buffer[0] = SM_CODE_PAIRING_FAILED;
buffer[1] = sm_pairing_failed_reason;
l2cap_send_connectionless(sm_response_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer));
sm_timeout_stop();
sm_state_responding = SM_STATE_IDLE;
break;
}
@ -590,6 +627,7 @@ static void sm_run(void){
buffer[0] = SM_CODE_PAIRING_RANDOM;
swap128(sm_s_random, &buffer[1]);
l2cap_send_connectionless(sm_response_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer));
sm_timeout_reset();
sm_state_responding = SM_STATE_PH2_W4_LTK_REQUEST;
break;
}
@ -627,6 +665,7 @@ static void sm_run(void){
buffer[0] = SM_CODE_PAIRING_CONFIRM;
swap128(sm_s_confirm, &buffer[1]);
l2cap_send_connectionless(sm_response_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer));
sm_timeout_reset();
sm_state_responding = SM_STATE_PH2_W4_LTK_REQUEST;
return;
}
@ -652,6 +691,7 @@ static void sm_run(void){
buffer[0] = SM_CODE_ENCRYPTION_INFORMATION;
swap128(sm_s_ltk, &buffer[1]);
l2cap_send_connectionless(sm_response_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer));
sm_timeout_reset();
return;
}
if (sm_send_master_identification){
@ -661,6 +701,7 @@ static void sm_run(void){
bt_store_16(buffer, 1, sm_s_ediv);
swap64(sm_s_rand, &buffer[3]);
l2cap_send_connectionless(sm_response_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer));
sm_timeout_reset();
return;
}
if (sm_send_identity_information){
@ -669,6 +710,7 @@ static void sm_run(void){
buffer[0] = SM_CODE_IDENTITY_INFORMATION;
swap128(sm_persistent_irk, &buffer[1]);
l2cap_send_connectionless(sm_response_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer));
sm_timeout_reset();
return;
}
if (sm_send_identity_address_information ){
@ -678,6 +720,7 @@ static void sm_run(void){
buffer[1] = sm_s_addr_type;
bt_flip_addr(&buffer[2], sm_s_address);
l2cap_send_connectionless(sm_response_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer));
sm_timeout_reset();
return;
}
if (sm_send_signing_identification){
@ -686,8 +729,10 @@ static void sm_run(void){
buffer[0] = SM_CODE_SIGNING_INFORMATION;
swap128(sm_s_csrk, &buffer[1]);
l2cap_send_connectionless(sm_response_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer));
sm_timeout_reset();
return;
}
sm_timeout_stop();
sm_state_responding = SM_STATE_IDLE;
break;
@ -705,6 +750,9 @@ static void sm_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *pac
switch (packet[0]){
case SM_CODE_PAIRING_REQUEST:
// a sm timeout requries a new physical connection
if (sm_state_responding == SM_STATE_TIMEOUT) break;
// store key distribtion request
sm_m_io_capabilities = packet[1];
sm_m_have_oob_data = packet[2];
@ -714,6 +762,9 @@ static void sm_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *pac
// for validate
memcpy(sm_preq, packet, 7);
// start sm timeout
sm_timeout_start();
// decide on Passkey Entry pairing algorithm
sm_tk_setup();
@ -941,6 +992,8 @@ static void packet_handler (void * connection, uint8_t packet_type, uint16_t cha
att_response_handle = 0;
att_response_size = 0;
sm_state_responding = SM_STATE_IDLE;
break;
case HCI_EVENT_COMMAND_COMPLETE: