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/*
This file is part of the ArduinoBLE library.
Copyright (c) 2018 Arduino SA. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "HCI.h"
#include "ATT.h"
#include "btct.h"
#include "L2CAPSignaling.h"
#include "keyDistribution.h"
#include "bitDescriptions.h"
#define CONNECTION_PARAMETER_UPDATE_REQUEST 0x12
#define CONNECTION_PARAMETER_UPDATE_RESPONSE 0x13
//#define _BLE_TRACE_
L2CAPSignalingClass::L2CAPSignalingClass() :
_minInterval(0),
_maxInterval(0),
_supervisionTimeout(0),
_pairing_enabled(1)
{
}
L2CAPSignalingClass::~L2CAPSignalingClass()
{
}
void L2CAPSignalingClass::addConnection(uint16_t handle, uint8_t role, uint8_t /*peerBdaddrType*/,
uint8_t /*peerBdaddr*/[6], uint16_t interval,
uint16_t /*latency*/, uint16_t supervisionTimeout,
uint8_t /*masterClockAccuracy*/)
{
if (role != 1) {
// ignore
return;
}
bool updateParameters = false;
uint16_t updatedMinInterval = interval;
uint16_t updatedMaxInterval = interval;
uint16_t updatedSupervisionTimeout = supervisionTimeout;
if (_minInterval && _maxInterval) {
if (interval < _minInterval || interval > _maxInterval) {
updatedMinInterval = _minInterval;
updatedMaxInterval = _maxInterval;
updateParameters = true;
}
}
if (_supervisionTimeout && supervisionTimeout != _supervisionTimeout) {
updatedSupervisionTimeout = _supervisionTimeout;
updateParameters = true;
}
if (updateParameters) {
struct __attribute__ ((packed)) L2CAPConnectionParameterUpdateRequest {
uint8_t code;
uint8_t identifier;
uint16_t length;
uint16_t minInterval;
uint16_t maxInterval;
uint16_t latency;
uint16_t supervisionTimeout;
} request = { CONNECTION_PARAMETER_UPDATE_REQUEST, 0x01, 8,
updatedMinInterval, updatedMaxInterval, 0x0000, updatedSupervisionTimeout };
HCI.sendAclPkt(handle, SIGNALING_CID, sizeof(request), &request);
}
}
void L2CAPSignalingClass::handleData(uint16_t connectionHandle, uint8_t dlen, uint8_t data[])
{
struct __attribute__ ((packed)) L2CAPSignalingHdr {
uint8_t code;
uint8_t identifier;
uint16_t length;
} *l2capSignalingHdr = (L2CAPSignalingHdr*)data;
if (dlen < sizeof(L2CAPSignalingHdr)) {
// too short, ignore
return;
}
if (dlen != (sizeof(L2CAPSignalingHdr) + l2capSignalingHdr->length)) {
// invalid length, ignore
return;
}
uint8_t code = l2capSignalingHdr->code;
uint8_t identifier = l2capSignalingHdr->identifier;
uint16_t length = l2capSignalingHdr->length;
data = &data[sizeof(L2CAPSignalingHdr)];
if (code == CONNECTION_PARAMETER_UPDATE_REQUEST) {
connectionParameterUpdateRequest(connectionHandle, identifier, length, data);
} else if (code == CONNECTION_PARAMETER_UPDATE_RESPONSE) {
connectionParameterUpdateResponse(connectionHandle, identifier, length, data);
}
}
void L2CAPSignalingClass::handleSecurityData(uint16_t connectionHandle, uint8_t dlen, uint8_t data[])
{
struct __attribute__ ((packed)) L2CAPSignalingHdr {
uint8_t code;
uint8_t data[64];
} *l2capSignalingHdr = (L2CAPSignalingHdr*)data;
#ifdef _BLE_TRACE_
Serial.print("dlen: ");
Serial.println(dlen);
#else
(void)dlen;
#endif
uint8_t code = l2capSignalingHdr->code;
#ifdef _BLE_TRACE_
Serial.print("handleSecurityData: code: 0x");
Serial.println(code, HEX);
Serial.print("rx security:");
btct.printBytes(data,dlen);
#endif
if (code == CONNECTION_PAIRING_REQUEST) {
if (isPairingEnabled()){
if (_pairing_enabled >= 2) _pairing_enabled = 0; // 2 = pair once only
// 0x1
struct __attribute__ ((packed)) PairingRequest {
uint8_t ioCapability;
uint8_t oobDataFlag;
uint8_t authReq;
uint8_t maxEncSize;
uint8_t initiatorKeyDistribution;
uint8_t responderKeyDistribution;
} *pairingRequest = (PairingRequest*)l2capSignalingHdr->data;
KeyDistribution responseKD = KeyDistribution();
responseKD.setIdKey(true);
ATT.remoteKeyDistribution = responseKD;// KeyDistribution(pairingRequest->initiatorKeyDistribution);
ATT.localKeyDistribution = responseKD; //KeyDistribution(pairingRequest->responderKeyDistribution);
// KeyDistribution rkd(pairingRequest->responderKeyDistribution);
AuthReq req(pairingRequest->authReq);
#ifdef _BLE_TRACE_
Serial.print("Req has properties: ");
Serial.print(req.Bonding()?"bonding, ":"no bonding, ");
Serial.print(req.CT2()?"CT2, ":"no CT2, ");
Serial.print(req.KeyPress()?"KeyPress, ":"no KeyPress, ");
Serial.print(req.MITM()?"MITM, ":"no MITM, ");
Serial.print(req.SC()?"SC, ":"no SC, ");
#endif
uint8_t peerIOCap[3];
peerIOCap[0] = pairingRequest->authReq;
peerIOCap[1] = pairingRequest->oobDataFlag;
peerIOCap[2] = pairingRequest->ioCapability;
ATT.setPeerIOCap(connectionHandle, peerIOCap);
ATT.setPeerEncryption(connectionHandle, ATT.getPeerEncryption(connectionHandle) | PEER_ENCRYPTION::PAIRING_REQUEST);
#ifdef _BLE_TRACE_
Serial.print("Peer encryption : 0b");
Serial.println(ATT.getPeerEncryption(connectionHandle), BIN);
#endif
struct __attribute__ ((packed)) PairingResponse {
uint8_t code;
uint8_t ioCapability;
uint8_t oobDataFlag;
uint8_t authReq;
uint8_t maxEncSize;
uint8_t initiatorKeyDistribution;
uint8_t responderKeyDistribution;
} response = { CONNECTION_PAIRING_RESPONSE, HCI.localIOCap(), 0, HCI.localAuthreq().getOctet(), 0x10, responseKD.getOctet(), responseKD.getOctet()};
HCI.sendAclPkt(connectionHandle, SECURITY_CID, sizeof(response), &response);
} else {
// Pairing not enabled
uint8_t ret[2] = {CONNECTION_PAIRING_FAILED, 0x05}; // reqect pairing
HCI.sendAclPkt(connectionHandle, SECURITY_CID, sizeof(ret), ret);
ATT.setPeerEncryption(connectionHandle, NO_ENCRYPTION);
}
}
else if (code == CONNECTION_PAIRING_RANDOM)
{
struct __attribute__ ((packed)) PairingRandom {
uint8_t Na[16];
} *pairingRandom = (PairingRandom*)l2capSignalingHdr->data;
for(int i=0; i<16; i++){
HCI.Na[15-i] = pairingRandom->Na[i];
}
#ifdef _BLE_TRACE_
Serial.println("[Info] Pairing random.");
#endif
struct __attribute__ ((packed)) PairingResponse {
uint8_t code;
uint8_t Nb[16];
} response = { CONNECTION_PAIRING_RANDOM, 0};
for(int i=0; i< 16; i++) response.Nb[15-i] = HCI.Nb[i];
HCI.sendAclPkt(connectionHandle, SECURITY_CID, sizeof(response), &response);
// We now have all needed for compare value
uint8_t g2Result[4];
uint8_t U[32];
uint8_t V[32];
for(int i=0; i<32; i++){
U[31-i] = HCI.remotePublicKeyBuffer[i];
V[31-i] = HCI.localPublicKeyBuffer[i];
}
btct.g2(U,V,HCI.Na,HCI.Nb, g2Result);
uint32_t result = 0;
for(int i=0; i<4; i++) result += g2Result[3-i] << 8*i;
#ifdef _BLE_TRACE_
Serial.print("U : ");
btct.printBytes(U,32);
Serial.print("V : ");
btct.printBytes(V,32);
Serial.print("X : ");
btct.printBytes(HCI.Na,16);
Serial.print("Y : ");
btct.printBytes(HCI.Nb,16);
Serial.print("g2res : ");
btct.printBytes(g2Result,4);
Serial.print("Result : ");
Serial.println(result);
#endif
if(HCI._displayCode!=0){
HCI._displayCode(result%1000000);
}
if(HCI._binaryConfirmPairing!=0){
if(!HCI._binaryConfirmPairing()){
#ifdef _BLE_TRACE_
Serial.println("User rejection");
#endif
uint8_t rejection[2];
rejection[0] = CONNECTION_PAIRING_FAILED;
rejection[1] = 0x0C; // Numeric comparison failed
HCI.sendAclPkt(connectionHandle, SECURITY_CID, 2, rejection);
ATT.setPeerEncryption(connectionHandle, PEER_ENCRYPTION::NO_ENCRYPTION);
}else{
#ifdef _BLE_TRACE_
Serial.println("User did confirm");
#endif
}
}
}
else if (code == CONNECTION_PAIRING_RESPONSE)
{
}
else if(code == CONNECTION_PAIRING_FAILED)
{
#ifdef _BLE_TRACE_
struct __attribute__ ((packed)) PairingFailed
{
uint8_t code;
uint8_t reason;
} *pairingFailed = (PairingFailed*)data;
Serial.print("Pairing failed with code: 0x");
Serial.println(pairingFailed->reason,HEX);
#endif
ATT.setPeerEncryption(connectionHandle, PEER_ENCRYPTION::NO_ENCRYPTION);
}
else if (code == CONNECTION_IDENTITY_INFORMATION){
struct __attribute__ ((packed)) IdentityInformation {
uint8_t code;
uint8_t PeerIRK[16];
} *identityInformation = (IdentityInformation*)data;
for(int i=0; i<16; i++) ATT.peerIRK[15-i] = identityInformation->PeerIRK[i];
#ifdef _BLE_TRACE_
Serial.println("Saved peer IRK");
#endif
}
else if (code == CONNECTION_IDENTITY_ADDRESS){
struct __attribute__ ((packed)) IdentityAddress {
uint8_t code;
uint8_t addressType;
uint8_t address[6];
} *identityAddress = (IdentityAddress*)data;
// we can save this information now.
uint8_t peerAddress[6];
for(int i=0; i<6; i++) peerAddress[5-i] = identityAddress->address[i];
HCI.saveNewAddress(identityAddress->addressType, peerAddress, ATT.peerIRK, ATT.localIRK);
if(HCI._storeLTK!=0){
HCI._storeLTK(peerAddress, HCI.LTK);
}
}
else if (code == CONNECTION_PAIRING_PUBLIC_KEY){
/// Received a public key
struct __attribute__ ((packed)) ConnectionPairingPublicKey {
uint8_t x[32];
uint8_t y[32];
} *connectionPairingPublicKey = (ConnectionPairingPublicKey*)l2capSignalingHdr->data;
struct __attribute__ ((packed)) GenerateDHKeyCommand {
uint8_t x[32];
uint8_t y[32];
} generateDHKeyCommand = {
{0x00},
{0x00},
};
memcpy(generateDHKeyCommand.x,connectionPairingPublicKey->x,32);
memcpy(generateDHKeyCommand.y,connectionPairingPublicKey->y,32);
if(ATT.setPeerEncryption(connectionHandle, ATT.getPeerEncryption(connectionHandle) | PEER_ENCRYPTION::REQUESTED_ENCRYPTION)){
#ifdef _BLE_TRACE_
Serial.println("[Info] Pairing public key");
Serial.println("Requested encryption stored.");
#endif
}else{
#ifdef _BLE_TRACE_
Serial.println("[Info] Pairing public key");
Serial.print("Failed to store encryption request with handle: 0x");
Serial.println(connectionHandle,HEX);
#endif
}
memcpy(HCI.remotePublicKeyBuffer,&generateDHKeyCommand,sizeof(generateDHKeyCommand));
HCI.sendCommand( (OGF_LE_CTL << 10 )| LE_COMMAND::READ_LOCAL_P256, 0);
}
else if(code == CONNECTION_PAIRING_DHKEY_CHECK)
{
uint8_t RemoteDHKeyCheck[16];
for(int i=0; i<16; i++) RemoteDHKeyCheck[15-i] = l2capSignalingHdr->data[i];
#ifdef _BLE_TRACE_
Serial.println("[Info] DH Key check");
Serial.print("Remote DHKey Check: ");
btct.printBytes(RemoteDHKeyCheck, 16);
#endif
uint8_t encryptionState = ATT.getPeerEncryption(connectionHandle) | PEER_ENCRYPTION::RECEIVED_DH_CHECK;
ATT.setPeerEncryption(connectionHandle, encryptionState);
if((encryptionState & PEER_ENCRYPTION::DH_KEY_CALULATED) == 0){
#ifdef _BLE_TRACE_
Serial.println("DHKey not yet ready, will calculate f5, f6 later");
#endif
// store RemoteDHKeyCheck for later check
memcpy(HCI.remoteDHKeyCheckBuffer,RemoteDHKeyCheck,16);
} else {
// We've already calculated the DHKey so we can calculate our check and send it.
smCalculateLTKandConfirm(connectionHandle, RemoteDHKeyCheck);
}
}
}
void L2CAPSignalingClass::smCalculateLTKandConfirm(uint16_t handle, uint8_t expectedEa[])
{ // Authentication stage 2: LTK Calculation
uint8_t localAddress[7];
uint8_t remoteAddress[7];
ATT.getPeerAddrWithType(handle, remoteAddress);
// Address is taken directly from HCI.localaddress,
// which is set when object DeviceLocal is created
// HCI.readBdAddr();
memcpy(&localAddress[1],HCI.localAddr,6);
localAddress[0] = ATT.getOwnBdaddrType(); // Adding bit with address type (e.g. Static random or public address)
// Compute the LTK and MacKey
uint8_t MacKey[16];
btct.f5(HCI.DHKey, HCI.Na, HCI.Nb, remoteAddress, localAddress, MacKey, HCI.LTK);
// Compute Ea and Eb
uint8_t Ea[16];
uint8_t Eb[16];
uint8_t R[16];
uint8_t MasterIOCap[3];
uint8_t SlaveIOCap[3] = {HCI.localAuthreq().getOctet(), 0x0, HCI.localIOCap()};
ATT.getPeerIOCap(handle, MasterIOCap);
for(int i=0; i<16; i++) R[i] = 0;
btct.f6(MacKey, HCI.Na,HCI.Nb,R, MasterIOCap, remoteAddress, localAddress, Ea);
btct.f6(MacKey, HCI.Nb,HCI.Na,R, SlaveIOCap, localAddress, remoteAddress, Eb);
#ifdef _BLE_TRACE_
Serial.println("Calculate and confirm LTK via f5, f6:");
Serial.print("DHKey : "); btct.printBytes(HCI.DHKey,32);
Serial.print("Na : "); btct.printBytes(HCI.Na,16);
Serial.print("Nb : "); btct.printBytes(HCI.Nb,16);
Serial.print("MacKey : "); btct.printBytes(MacKey,16);
Serial.print("LTK : "); btct.printBytes(HCI.LTK,16);
Serial.print("Expected Ea: "); btct.printBytes(expectedEa, 16);
Serial.print("Ea : "); btct.printBytes(Ea, 16);
Serial.print("Eb : "); btct.printBytes(Eb,16);
Serial.print("Local Addr : "); btct.printBytes(localAddress, 7);
Serial.print("LocalIOCap : "); btct.printBytes(SlaveIOCap, 3);
Serial.print("MasterAddr : "); btct.printBytes(remoteAddress, 7);
Serial.print("MasterIOCAP: "); btct.printBytes(MasterIOCap, 3);
#endif
// Check if Ea = expectedEa
if (memcmp(Ea, expectedEa, 16) == 0){
// Check ok
// Send our confirmation value to complete authentication stage 2
uint8_t ret[17];
ret[0] = CONNECTION_PAIRING_DHKEY_CHECK;
for(uint32_t i=0; i<sizeof(Eb); i++){
ret[sizeof(Eb)-i] = Eb[i];
}
HCI.sendAclPkt(handle, SECURITY_CID, sizeof(ret), ret );
uint8_t encryption = ATT.getPeerEncryption(handle) | PEER_ENCRYPTION::SENT_DH_CHECK;
ATT.setPeerEncryption(handle, encryption);
#ifdef _BLE_TRACE_
Serial.println("DHKey check ok - send Eb back");
#endif
} else {
// Check failed, abort pairing
uint8_t ret[2] = {CONNECTION_PAIRING_FAILED, 0x0B}; // 0x0B = DHKey Check Failed
HCI.sendAclPkt(handle, SECURITY_CID, sizeof(ret), ret);
ATT.setPeerEncryption(handle, NO_ENCRYPTION);
#ifdef _BLE_TRACE_
Serial.println("Error: DHKey check failed - Aborting");
#endif
}
}
void L2CAPSignalingClass::removeConnection(uint8_t /*handle*/, uint16_t /*reason*/)
{
}
void L2CAPSignalingClass::setConnectionInterval(uint16_t minInterval, uint16_t maxInterval)
{
_minInterval = minInterval;
_maxInterval = maxInterval;
}
void L2CAPSignalingClass::setSupervisionTimeout(uint16_t supervisionTimeout)
{
_supervisionTimeout = supervisionTimeout;
}
void L2CAPSignalingClass::setPairingEnabled(uint8_t enabled)
{
_pairing_enabled = enabled;
}
bool L2CAPSignalingClass::isPairingEnabled()
{
return _pairing_enabled > 0;
}
void L2CAPSignalingClass::connectionParameterUpdateRequest(uint16_t handle, uint8_t identifier, uint8_t dlen, uint8_t data[])
{
struct __attribute__ ((packed)) L2CAPConnectionParameterUpdateRequest {
uint16_t minInterval;
uint16_t maxInterval;
uint16_t latency;
uint16_t supervisionTimeout;
} *request = (L2CAPConnectionParameterUpdateRequest*)data;
if (dlen < sizeof(L2CAPConnectionParameterUpdateRequest)) {
// too short, ignore
return;
}
struct __attribute__ ((packed)) L2CAPConnectionParameterUpdateResponse {
uint8_t code;
uint8_t identifier;
uint16_t length;
uint16_t value;
} response = { CONNECTION_PARAMETER_UPDATE_RESPONSE, identifier, 2, 0x0000 };
if (_minInterval && _maxInterval) {
if (request->minInterval < _minInterval || request->maxInterval > _maxInterval) {
response.value = 0x0001; // reject
}
}
if (_supervisionTimeout) {
if (request->supervisionTimeout != _supervisionTimeout) {
response.value = 0x0001; // reject
}
}
HCI.sendAclPkt(handle, SIGNALING_CID, sizeof(response), &response);
if (response.value == 0x0000) {
HCI.leConnUpdate(handle, request->minInterval, request->maxInterval, request->latency, request->supervisionTimeout);
}
}
void L2CAPSignalingClass::connectionParameterUpdateResponse(uint16_t /*handle*/, uint8_t /*identifier*/, uint8_t /*dlen*/, uint8_t /*data*/[])
{
}
#if !defined(FAKE_L2CAP)
L2CAPSignalingClass L2CAPSignalingObj;
L2CAPSignalingClass& L2CAPSignaling = L2CAPSignalingObj;
#endif
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