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https://github.com/bluekitchen/btstack.git
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introduce sm_pairing_packet struct to avoid duplicate data, get oob data right after connect
This commit is contained in:
matthias.ringwald
parent
4582af4c24
commit
67be2318fb
126
ble/sm.c
126
ble/sm.c
@ -52,6 +52,9 @@ typedef enum {
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SM_STATE_IDLE,
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// SLAVE ROLE
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SM_STATE_W4_PAIRING_REQUEST,
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SM_STATE_SEND_SECURITY_REQUEST,
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SM_STATE_SEND_LTK_REQUESTED_NEGATIVE_REPLY,
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@ -117,6 +120,9 @@ typedef enum {
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SM_STATE_TIMEOUT, // no other security messages are exchanged
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// MASTR ROLE
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SM_STATE_SEND_PAIRING_REQUEST,
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} security_manager_state_t;
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typedef enum {
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@ -174,6 +180,16 @@ typedef enum {
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SM_AES128_ACTIVE
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} sm_aes128_state_t;
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typedef struct sm_pairing_packet {
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uint8_t code;
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uint8_t io_capability;
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uint8_t oob_data_flag;
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uint8_t auth_req;
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uint8_t max_encryption_key_size;
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uint8_t initiator_key_distribution;
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uint8_t responder_key_distribution;
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} sm_pairing_packet_t;
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//
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// GLOBAL DATA
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//
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@ -247,12 +263,7 @@ typedef struct sm_setup_context {
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uint8_t sm_user_response;
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// master = remote data
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uint8_t sm_m_io_capabilities;
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uint8_t sm_m_have_oob_data;
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uint8_t sm_m_auth_req;
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uint8_t sm_m_max_encryption_key_size;
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uint8_t sm_m_key_distribution;
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uint8_t sm_m_preq[7];
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sm_pairing_packet_t sm_m_preq; // pairing request
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sm_key_t sm_m_random;
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sm_key_t sm_m_confirm;
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@ -267,12 +278,9 @@ typedef struct sm_setup_context {
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sm_key_t sm_m_irk;
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// slave = local data
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uint8_t sm_s_io_capabilities;
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uint8_t sm_s_have_oob_data;
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uint8_t sm_s_auth_req;
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sm_pairing_packet_t sm_s_pres; // pairing response
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sm_key_t sm_s_random;
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sm_key_t sm_s_confirm;
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uint8_t sm_s_pres[7];
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// key distribution, slave sends
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sm_key_t sm_s_ltk;
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@ -540,18 +548,11 @@ static void sm_setup_tk(){
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// default: just works
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sm_stk_generation_method = JUST_WORKS;
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sm_reset_tk();
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// query client for OOB data
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setup->sm_s_have_oob_data = 0;
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if (sm_get_oob_data) {
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(*sm_get_oob_data)(setup->sm_m_addr_type, &setup->sm_m_address, setup->sm_tk);
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}
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// If both devices have out of band authentication data, then the Authentication
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// Requirements Flags shall be ignored when selecting the pairing method and the
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// Out of Band pairing method shall be used.
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if (setup->sm_m_have_oob_data && setup->sm_s_have_oob_data){
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if (setup->sm_m_preq.oob_data_flag && setup->sm_s_pres.oob_data_flag){
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printf("SM: have OOB data");
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print_key("OOB", setup->sm_tk);
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sm_stk_generation_method = OOB;
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@ -561,20 +562,20 @@ static void sm_setup_tk(){
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// If both devices have not set the MITM option in the Authentication Requirements
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// Flags, then the IO capabilities shall be ignored and the Just Works association
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// model shall be used.
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if ( ((setup->sm_m_auth_req & SM_AUTHREQ_MITM_PROTECTION) == 0x00) && ((setup->sm_s_auth_req & SM_AUTHREQ_MITM_PROTECTION) == 0)){
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if ( ((setup->sm_m_preq.auth_req & SM_AUTHREQ_MITM_PROTECTION) == 0x00) && ((setup->sm_s_pres.auth_req & SM_AUTHREQ_MITM_PROTECTION) == 0)){
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return;
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}
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// Also use just works if unknown io capabilites
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if ((setup->sm_m_io_capabilities > IO_CAPABILITY_KEYBOARD_DISPLAY) || (setup->sm_m_io_capabilities > IO_CAPABILITY_KEYBOARD_DISPLAY)){
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if ((setup->sm_m_preq.io_capability > IO_CAPABILITY_KEYBOARD_DISPLAY) || (setup->sm_m_preq.io_capability > IO_CAPABILITY_KEYBOARD_DISPLAY)){
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return;
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}
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// Otherwise the IO capabilities of the devices shall be used to determine the
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// pairing method as defined in Table 2.4.
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sm_stk_generation_method = stk_generation_method[setup->sm_s_io_capabilities][setup->sm_m_io_capabilities];
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sm_stk_generation_method = stk_generation_method[setup->sm_s_pres.io_capability][setup->sm_m_preq.io_capability];
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printf("sm_setup_tk: master io cap: %u, slave io cap: %u -> method %u\n",
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setup->sm_m_io_capabilities, setup->sm_s_io_capabilities, sm_stk_generation_method);
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setup->sm_m_preq.io_capability, setup->sm_s_pres.io_capability, sm_stk_generation_method);
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}
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static int sm_key_distribution_flags_for_set(uint8_t key_set){
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@ -779,7 +780,7 @@ static void sm_cmac_handle_encryption_result(sm_key_t data){
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static int sm_key_distribution_done(){
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if (setup->sm_key_distribution_send_set) return 0;
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int recv_flags = sm_key_distribution_flags_for_set(setup->sm_m_key_distribution);
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int recv_flags = sm_key_distribution_flags_for_set(setup->sm_m_preq.initiator_key_distribution);
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return recv_flags == setup->sm_key_distribution_received_set;
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}
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@ -927,20 +928,12 @@ static void sm_run(void){
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case SM_STATE_PH1_SEND_PAIRING_RESPONSE: {
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uint8_t buffer[7];
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// echo initiator for now
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setup->sm_s_pres.code = SM_CODE_PAIRING_RESPONSE;
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setup->sm_s_pres.initiator_key_distribution = setup->sm_m_preq.initiator_key_distribution;
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setup->sm_s_pres.responder_key_distribution = setup->sm_m_preq.responder_key_distribution;
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memcpy(buffer, setup->sm_m_preq, 7);
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buffer[0] = SM_CODE_PAIRING_RESPONSE;
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buffer[1] = setup->sm_s_io_capabilities;
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buffer[2] = setup->sm_s_have_oob_data;
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buffer[3] = setup->sm_s_auth_req;
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buffer[4] = sm_max_encryption_key_size;
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memcpy(setup->sm_s_pres, buffer, 7);
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// for validate
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l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer));
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l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) &setup->sm_s_pres, sizeof(sm_pairing_packet));
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sm_2timeout_reset();
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// notify client for: JUST WORKS confirm, PASSKEY display or input
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@ -954,7 +947,7 @@ static void sm_run(void){
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sm_notify_client(SM_PASSKEY_DISPLAY_NUMBER, setup->sm_m_addr_type, setup->sm_m_address, READ_NET_32(setup->sm_tk, 12), 0);
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break;
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case JUST_WORKS:
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switch (setup->sm_s_io_capabilities){
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switch (setup->sm_s_pres.io_capability){
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case IO_CAPABILITY_KEYBOARD_DISPLAY:
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case IO_CAPABILITY_DISPLAY_YES_NO:
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setup->sm_user_response = SM_USER_RESPONSE_PENDING;
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@ -1028,7 +1021,7 @@ static void sm_run(void){
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// already busy?
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if (sm_aes128_state == SM_AES128_ACTIVE) break;
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// calculate m_confirm using aes128 engine - step 1
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sm_c1_t1(setup->sm_m_random, setup->sm_m_preq, setup->sm_s_pres, setup->sm_m_addr_type, setup->sm_s_addr_type, plaintext);
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sm_c1_t1(setup->sm_m_random, (uint8_t*) &setup->sm_m_preq, (uint8_t*) &setup->sm_s_pres, setup->sm_m_addr_type, setup->sm_s_addr_type, plaintext);
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sm_aes128_start(setup->sm_tk, plaintext);
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sm_next_responding_state();
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break;
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@ -1036,7 +1029,7 @@ static void sm_run(void){
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// already busy?
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if (sm_aes128_state == SM_AES128_ACTIVE) break;
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// calculate s_confirm using aes128 engine - step 1
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sm_c1_t1(setup->sm_s_random, setup->sm_m_preq, setup->sm_s_pres, setup->sm_m_addr_type, setup->sm_s_addr_type, plaintext);
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sm_c1_t1(setup->sm_s_random, (uint8_t*) &setup->sm_m_preq, (uint8_t*) &setup->sm_s_pres, setup->sm_m_addr_type, setup->sm_s_addr_type, plaintext);
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sm_aes128_start(setup->sm_tk, plaintext);
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sm_next_responding_state();
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break;
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@ -1375,6 +1368,7 @@ static void sm_handle_random_result(uint8_t * data){
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static void sm_event_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
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sm_run();
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int have_oob_data;
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switch (packet_type) {
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@ -1418,11 +1412,34 @@ static void sm_event_packet_handler (uint8_t packet_type, uint16_t channel, uint
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// fill in sm setup
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sm_reset_tk();
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hci_le_advertisement_address(&setup->sm_s_addr_type, &setup->sm_s_address);
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setup->sm_m_addr_type = packet[7];
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bt_flip_addr(setup->sm_m_address, &packet[8]);
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setup->sm_s_auth_req = sm_auth_req;
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setup->sm_s_io_capabilities = sm_io_capabilities;
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// query client for OOB data
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have_oob_data = 0;
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if (sm_get_oob_data) {
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have_oob_data = (*sm_get_oob_data)(connection->sm_peer_addr_type, &connection->sm_peer_address, setup->sm_tk);
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}
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if (connection->sm_role){
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// slave
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hci_le_advertisement_address(&setup->sm_s_addr_type, &setup->sm_s_address);
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setup->sm_m_addr_type = packet[7];
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bt_flip_addr(setup->sm_m_address, &packet[8]);
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setup->sm_s_pres.io_capability = sm_io_capabilities;
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setup->sm_s_pres.oob_data_flag = have_oob_data;
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setup->sm_s_pres.auth_req = sm_auth_req;
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setup->sm_s_pres.max_encryption_key_size = sm_max_encryption_key_size;
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connection->sm_state_responding = SM_STATE_W4_PAIRING_REQUEST;
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} else {
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// master
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hci_le_advertisement_address(&setup->sm_m_addr_type, &setup->sm_m_address);
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setup->sm_s_addr_type = packet[7];
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bt_flip_addr(setup->sm_s_address, &packet[8]);
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setup->sm_m_preq.io_capability = sm_io_capabilities;
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setup->sm_m_preq.oob_data_flag = have_oob_data;
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setup->sm_m_preq.auth_req = sm_auth_req;
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setup->sm_m_preq.max_encryption_key_size = sm_max_encryption_key_size;
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connection->sm_state_responding = SM_STATE_SEND_PAIRING_REQUEST;
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}
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// request security if we're slave and requested by app
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if (connection->sm_role == 0x01 && sm_slave_request_security){
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@ -1531,20 +1548,19 @@ static void sm_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *pac
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case SM_STATE_TIMEOUT:
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return;
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case SM_STATE_IDLE: {
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case SM_STATE_IDLE:
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case SM_STATE_W4_PAIRING_REQUEST:
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{
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if (packet[0] != SM_CODE_PAIRING_REQUEST){
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sm_pdu_received_in_wrong_state();
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break;;
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}
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// store key distribtion request
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setup->sm_m_io_capabilities = packet[1];
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setup->sm_m_have_oob_data = packet[2];
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setup->sm_m_auth_req = packet[3];
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setup->sm_m_max_encryption_key_size = packet[4];
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memcpy(&setup->sm_m_preq, packet, sizeof(sm_pairing_packet_t));
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// assert max encryption size above our minimum
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if (setup->sm_m_max_encryption_key_size < sm_min_encryption_key_size){
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if (setup->sm_m_preq.max_encryption_key_size < sm_min_encryption_key_size){
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setup->sm_pairing_failed_reason = SM_REASON_ENCRYPTION_KEY_SIZE;
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connection->sm_state_responding = SM_STATE_SEND_PAIRING_FAILED;
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break;
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@ -1552,16 +1568,12 @@ static void sm_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *pac
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// min{}
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connection->sm_actual_encryption_key_size = sm_max_encryption_key_size;
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if (setup->sm_m_max_encryption_key_size < sm_max_encryption_key_size){
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connection->sm_actual_encryption_key_size = setup->sm_m_max_encryption_key_size;
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if (setup->sm_m_preq.max_encryption_key_size < sm_max_encryption_key_size){
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connection->sm_actual_encryption_key_size = setup->sm_m_preq.max_encryption_key_size;
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}
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// setup key distribution
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setup->sm_m_key_distribution = packet[5];
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sm_setup_key_distribution(packet[6]);
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// for validate
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memcpy(setup->sm_m_preq, packet, 7);
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sm_setup_key_distribution(setup->sm_m_preq.responder_key_distribution);
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// start SM timeout
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sm_2timeout_start();
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