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green_power.cpp
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green_power.cpp
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/*
* Copyright (c) 2020-2024 dresden elektronik ingenieurtechnik gmbh.
* All rights reserved.
*
* The software in this package is published under the terms of the BSD
* style license a copy of which has been included with this distribution in
* the LICENSE.txt file.
*
*/
#include <QDataStream>
#ifdef HAS_OPENSSL
#define OPEN_SSL_VERSION_MIN 0x10100000L
#include <openssl/opensslv.h>
#if OPENSSL_VERSION_NUMBER >= OPEN_SSL_VERSION_MIN
#define HAS_RECENT_OPENSSL
#endif
#endif
#ifdef HAS_RECENT_OPENSSL
#include <openssl/aes.h>
#include <openssl/evp.h>
#endif
#include <string>
#include "deconz/aps_controller.h"
#include "deconz/dbg_trace.h"
#include "deconz/green_power.h"
#include "deconz/zcl.h"
#include "deconz/u_library_ex.h"
#include "green_power.h"
#include "resource.h"
#define GP_PAIR_INTERVAL_SECONDS (60 * 15)
// this code is based on
// https://github.com/Smanar/Zigbee_firmware/blob/master/Encryption.cpp
#define AES_KEYLENGTH 128
#define AES_BLOCK_SIZE 16
// From https://github.com/Koenkk/zigbee-herdsman/blob/master/src/controller/greenPower.ts
/*!
*/
GpKey_t GP_DecryptSecurityKey(quint32 sourceID, const GpKey_t &securityKey)
{
GpKey_t result = { 0 };
#ifdef HAS_RECENT_OPENSSL
void *libCrypto = nullptr;
void *libSsl = nullptr;
const unsigned char defaultTCLinkKey[] = { 0x5A, 0x69, 0x67, 0x42, 0x65, 0x65, 0x41, 0x6C, 0x6C, 0x69, 0x61, 0x6E, 0x63, 0x65, 0x30, 0x39 };
unsigned char nonce[13]; // u8 source address, u32 frame counter, u8 security control
unsigned char sourceIDInBytes[4];
sourceIDInBytes[0] = sourceID & 0x000000ff;
sourceIDInBytes[1] = (sourceID & 0x0000ff00) >> 8;
sourceIDInBytes[2] = (sourceID & 0x00ff0000) >> 16;
sourceIDInBytes[3] = (sourceID & 0xff000000) >> 24;
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 4; j++)
{
nonce[4 * i + j] = sourceIDInBytes[j];
}
}
nonce[12] = 0x05;
libCrypto = U_library_open_ex("libcrypto");
libSsl = U_library_open_ex("libssl");
if (!libCrypto || !libSsl)
{
DBG_Printf(DBG_ZGP, "[ZGP] OpenSSl library for ZGP encryption not found\n");
return result;
}
unsigned long openSslVersion = 0;
auto _OpenSSL_version_num = reinterpret_cast<unsigned long (*)(void)>(U_library_symbol(libCrypto, "OpenSSL_version_num"));
const auto _EVP_CIPHER_CTX_new = reinterpret_cast<EVP_CIPHER_CTX*(*)(void)>(U_library_symbol(libCrypto, "EVP_CIPHER_CTX_new"));
const auto _EVP_EncryptInit_ex = reinterpret_cast<int (*)(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, const unsigned char *key, const unsigned char *iv)>(U_library_symbol(libCrypto, "EVP_EncryptInit_ex"));
const auto _EVP_CIPHER_CTX_ctrl = reinterpret_cast<int (*)(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)>(U_library_symbol(libCrypto, "EVP_CIPHER_CTX_ctrl"));
const auto _EVP_EncryptUpdate = reinterpret_cast<int (*)(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, const unsigned char *in, int inl)>(U_library_symbol(libCrypto, "EVP_EncryptUpdate"));
const auto _EVP_CIPHER_CTX_free = reinterpret_cast<void (*)(EVP_CIPHER_CTX *c)>(U_library_symbol(libCrypto, "EVP_CIPHER_CTX_free"));
const auto _EVP_aes_128_ccm = reinterpret_cast<const EVP_CIPHER *(*)(void)>(U_library_symbol(libCrypto, "EVP_aes_128_ccm"));
if (_OpenSSL_version_num)
{
openSslVersion = _OpenSSL_version_num();
}
if (openSslVersion >= OPEN_SSL_VERSION_MIN &&
_EVP_CIPHER_CTX_new &&
_EVP_EncryptInit_ex &&
_EVP_CIPHER_CTX_ctrl &&
_EVP_EncryptUpdate &&
_EVP_CIPHER_CTX_free &&
_EVP_aes_128_ccm)
{
DBG_Printf(DBG_ZGP, "[ZGP] OpenSSl version 0x%08X loaded\n", openSslVersion);
}
else
{
DBG_Printf(DBG_ZGP, "[ZGP] OpenSSl library version 0x%08X for ZGP encryption resolve symbols failed\n", openSslVersion);
return result;
}
// buffers for encryption and decryption
constexpr size_t encryptLength = ((GP_SECURITY_KEY_SIZE + AES_BLOCK_SIZE) / AES_BLOCK_SIZE) * AES_BLOCK_SIZE;
std::array<unsigned char, encryptLength> encryptBuf = { 0 };
EVP_CIPHER_CTX *ctx = _EVP_CIPHER_CTX_new();
int outlen = 0;
/* Set cipher type and mode */
_EVP_EncryptInit_ex(ctx, _EVP_aes_128_ccm(), nullptr, nullptr, nullptr);
/* Set nonce length if default 96 bits is not appropriate */
_EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, sizeof(nonce), nullptr);
/* Initialise key and IV */
_EVP_EncryptInit_ex(ctx, nullptr, nullptr, defaultTCLinkKey, nonce);
/* Encrypt plaintext: can only be called once */
_EVP_EncryptUpdate(ctx, encryptBuf.data(), &outlen, securityKey.data(), static_cast<int>(securityKey.size()));
_EVP_CIPHER_CTX_free(ctx);
std::copy(encryptBuf.begin(), encryptBuf.begin() + result.size(), result.begin());
#else
Q_UNUSED(securityKey)
DBG_Printf(DBG_ERROR, "[ZGP] failed to decrypt GPDKey for 0x%08X, OpenSSL is not available or too old\n", unsigned(sourceID));
#endif // HAS_RECENT_OPENSSL
return result;
}
/*! Send Commissioning Mode command to GP proxy device.
*/
bool GP_SendProxyCommissioningMode(deCONZ::ApsController *apsCtrl, quint8 zclSeqNo)
{
deCONZ::ApsDataRequest req;
req.setDstAddressMode(deCONZ::ApsNwkAddress);
req.dstAddress().setNwk(deCONZ::BroadcastRouters);
req.setProfileId(GP_PROFILE_ID);
req.setClusterId(GREEN_POWER_CLUSTER_ID);
req.setDstEndpoint(GREEN_POWER_ENDPOINT);
req.setSrcEndpoint(GREEN_POWER_ENDPOINT);
#if QT_VERSION < QT_VERSION_CHECK(5,15,0)
req.setTxOptions(nullptr);
#endif
req.setRadius(0);
QDataStream stream(&req.asdu(), QIODevice::WriteOnly);
stream.setByteOrder(QDataStream::LittleEndian);
deCONZ::ZclFrame zclFrame;
zclFrame.setSequenceNumber(zclSeqNo);
zclFrame.setCommandId(0x02); // commissioning mode
zclFrame.setFrameControl(deCONZ::ZclFCClusterCommand |
deCONZ::ZclFCDirectionServerToClient |
deCONZ::ZclFCDisableDefaultResponse);
{ // payload
QDataStream stream(&zclFrame.payload(), QIODevice::WriteOnly);
stream.setByteOrder(QDataStream::LittleEndian);
quint8 options = 0x0b; // enter commissioning mode, exit on window expire
quint16 window = 40;
stream << options;
stream << window;
}
{ // ZCL frame
QDataStream stream(&req.asdu(), QIODevice::WriteOnly);
stream.setByteOrder(QDataStream::LittleEndian);
zclFrame.writeToStream(stream);
}
// broadcast
if (apsCtrl->apsdeDataRequest(req) == deCONZ::Success)
{
DBG_Printf(DBG_ZGP, "[ZGP] send GP proxy commissioning mode\n");
return true;
}
DBG_Printf(DBG_ZGP, "[ZGP] send GP proxy commissioning mode failed\n");
return false;
}
/*! Send Pair command to GP proxy device.
*/
bool GP_SendPairing(quint32 gpdSrcId, quint16 sinkGroupId, quint8 deviceId, quint32 frameCounter, const GpKey_t &key, deCONZ::ApsController *apsCtrl, quint8 zclSeqNo, quint16 gppShortAddress)
{
deCONZ::ApsDataRequest req;
req.setDstAddressMode(deCONZ::ApsNwkAddress);
req.dstAddress().setNwk(gppShortAddress);
req.setProfileId(GP_PROFILE_ID);
req.setClusterId(GREEN_POWER_CLUSTER_ID);
req.setDstEndpoint(GREEN_POWER_ENDPOINT);
req.setSrcEndpoint(GREEN_POWER_ENDPOINT);
#if QT_VERSION < QT_VERSION_CHECK(5,15,0)
req.setTxOptions(nullptr);
#endif
req.setRadius(0);
QDataStream stream(&req.asdu(), QIODevice::WriteOnly);
stream.setByteOrder(QDataStream::LittleEndian);
deCONZ::ZclFrame zclFrame;
zclFrame.setSequenceNumber(zclSeqNo);
zclFrame.setCommandId(0x01); // pairing
zclFrame.setFrameControl(deCONZ::ZclFCClusterCommand |
deCONZ::ZclFCDirectionServerToClient |
deCONZ::ZclFCDisableDefaultResponse);
{ // payload
QDataStream stream(&zclFrame.payload(), QIODevice::WriteOnly);
stream.setByteOrder(QDataStream::LittleEndian);
// 0..2: applicationID
// 3: add sink
// 4: remove gpd
// 5..6: communication mode
// 7: gpd fixed
quint8 options0 = 0x48; // bits 0..7: add sink, enter commissioning mode, exit on window expire
// 0 / 8: gpd mac seq number capabilities
// 1..2 / 9..10: security level
// 3..5 / 11..13: security key type
// 6 / 14: frame counter present
// 7 / 15: gpd security key present
// The GPDsecurityFrameCounter field shall be present whenever the AddSink sub-field of the Options field is set to 0b1;
quint8 options1 = 0xe5;
// bits 8..15: security level 0b10 (Full (4B) frame counter and full (4B) MIC only)
// key type 0b100 (individual, out- of-the-box GPD key),
// frame counter present, security key present
quint8 options2 = 0x00;
stream << options0;
stream << options1;
stream << options2;
stream << gpdSrcId;
stream << sinkGroupId;
stream << deviceId;
stream << frameCounter;
{
for (size_t i = 0; i < 16; i++)
{
stream << key[i];
}
}
}
{ // ZCL frame
QDataStream stream(&req.asdu(), QIODevice::WriteOnly);
stream.setByteOrder(QDataStream::LittleEndian);
zclFrame.writeToStream(stream);
}
// broadcast
if (apsCtrl->apsdeDataRequest(req) == deCONZ::Success)
{
DBG_Printf(DBG_ZGP, "[ZGP] send GP pairing to 0x%04X\n", gppShortAddress);
return true;
}
DBG_Printf(DBG_ZGP, "[ZGP] send GP pairing to 0x%04X failed\n", gppShortAddress);
return false;
}
// TODO remove TMP_ functions after alarm systems PR is merged, where these functions are in utils.h
static bool TMP_isHexChar(char ch)
{
return ((ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f') || (ch >= 'A' && ch <= 'F'));
}
static quint64 TMP_extAddressFromUniqueId(const QString &uniqueId)
{
quint64 result = 0;
if (uniqueId.size() < 23)
{
return result;
}
// 28:6d:97:00:01:06:41:79-01-0500 31 characters
int pos = 0;
char buf[16 + 1];
for (auto ch : uniqueId)
{
if (ch != ':')
{
buf[pos] = ch.toLatin1();
if (!TMP_isHexChar(buf[pos]))
{
return result;
}
pos++;
}
if (pos == 16)
{
buf[pos] = '\0';
break;
}
}
if (pos == 16)
{
result = strtoull(buf, nullptr, 16);
}
return result;
}
/*! For already paired ZGP devices a Pair command needs to be send periodically every \c GP_PAIR_INTERVAL_SECONDS
in order to keep ZGP Proxy entrys alive.
Each ZGP device keeps track of when the last Pair command was sent and the current device frame counter.
*/
bool GP_SendPairingIfNeeded(Resource *resource, deCONZ::ApsController *apsCtrl, quint8 zclSeqNo)
{
if (!resource || !apsCtrl)
{
return false;
}
ResourceItem *gpdLastpair = resource->item(RStateGPDLastPair);
if (!gpdLastpair)
{
return false;
}
const deCONZ::SteadyTimeRef now = deCONZ::steadyTimeRef();
if (now - deCONZ::SteadyTimeRef{gpdLastpair->toNumber()} < deCONZ::TimeSeconds{GP_PAIR_INTERVAL_SECONDS})
{
return false;
}
// the GPDKey must be known to send pair command
ResourceItem *gpdKey = resource->item(RConfigGPDKey);
if (!gpdKey || gpdKey->toString().isEmpty())
{
return false;
}
ResourceItem *frameCounter = resource->item(RStateGPDFrameCounter);
ResourceItem *gpdDeviceId = resource->item(RConfigGPDDeviceId);
ResourceItem *uniqueId = resource->item(RAttrUniqueId);
if (!gpdKey || !frameCounter || !gpdDeviceId || !uniqueId)
{
return false;
}
auto srcGpdId = TMP_extAddressFromUniqueId(uniqueId->toString());
if (srcGpdId == 0 || srcGpdId > UINT32_MAX)
{
return false; // should not happen
}
GpKey_t key;
{
QByteArray arr = QByteArray::fromHex(gpdKey->toString().toLocal8Bit());
DBG_Assert(arr.size() == int(key.size()));
if (arr.size() != int(key.size()))
{
return false;
}
memcpy(key.data(), arr.constData(), key.size());
}
quint8 deviceId = gpdDeviceId->toNumber() & 0xFF;
if (GP_SendPairing(quint32(srcGpdId), GP_DEFAULT_PROXY_GROUP, deviceId, frameCounter->toNumber(), key, apsCtrl, zclSeqNo, deCONZ::BroadcastRouters))
{
gpdLastpair->setValue(now.ref);
return true;
}
return false;
}