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@ -149,6 +149,9 @@ class ApplicationLayer
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virtual void dataIndividualRequest(AckType ack, HopCountType hopType, Priority priority, uint16_t destination, APDU& apdu);
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virtual void dataConnectedRequest(uint16_t tsap, Priority priority, APDU& apdu); // apdu must be valid until it was confirmed
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// Protected: we need to access it in derived class SecureApplicationLayer
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TransportLayer* _transportLayer = 0;
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private:
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void propertyDataSend(ApduType type, AckType ack, Priority priority, HopCountType hopType, uint16_t asap,
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uint8_t objectIndex, uint8_t propertyId, uint8_t numberOfElements, uint16_t startIndex, uint8_t* data,
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@ -167,6 +170,6 @@ class ApplicationLayer
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uint16_t _savedAsapResponse;
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AssociationTableObject& _assocTable;
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BusAccessUnit& _bau;
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TransportLayer* _transportLayer = 0;
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int32_t _connectedTsap = -1;
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};
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@ -225,7 +225,7 @@ void SecureApplicationLayer::dataConnectedRequest(uint16_t tsap, Priority priori
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ApplicationLayer::dataConnectedRequest(tsap, priority, apdu);
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}
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uint32_t SecureApplicationLayer::calcAuthOnlyMac(uint8_t* apdu, uint8_t apduLength, uint8_t* key, uint8_t* iv, uint8_t* ctr0)
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uint32_t SecureApplicationLayer::calcAuthOnlyMac(uint8_t* apdu, uint8_t apduLength, const uint8_t* key, uint8_t* iv, uint8_t* ctr0)
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{
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uint16_t bufLen = 2 + apduLength; // 2 bytes for the length field (uint16_t)
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// AES-128 operates on blocks of 16 bytes, add padding
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@ -261,7 +261,7 @@ uint32_t SecureApplicationLayer::calcAuthOnlyMac(uint8_t* apdu, uint8_t apduLeng
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uint32_t SecureApplicationLayer::calcConfAuthMac(uint8_t* associatedData, uint16_t associatedDataLength,
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uint8_t* apdu, uint8_t apduLength,
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uint8_t* key, uint8_t* iv)
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const uint8_t* key, uint8_t* iv)
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{
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uint16_t bufLen = 2 + associatedDataLength + apduLength; // 2 bytes for the length field (uint16_t)
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// AES-128 operates on blocks of 16 bytes, add padding
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@ -316,6 +316,23 @@ void SecureApplicationLayer::blockCtr0(uint8_t* buffer, uint8_t* seqNum, uint16_
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pBuf = pushByte(0x01, pBuf);
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}
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void SecureApplicationLayer::sixBytes(uint64_t num, uint8_t* toByteArray)
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{
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*(toByteArray + 0) = (uint16_t)(num >> 32);
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*(toByteArray + 2) = (uint32_t)(num);
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}
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uint64_t SecureApplicationLayer::toUInt64(uint8_t* data, uint8_t dataLen)
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{
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uint64_t l = 0;
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for (uint8_t i = 0; i< dataLen; i++)
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{
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l = (l << 8) + data[i];
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}
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return l;
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}
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const uint8_t* SecureApplicationLayer::toolKey(uint16_t devAddr)
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{
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const uint8_t* toolKey = _secIfObj.propertyData(PID_TOOL_KEY);
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@ -324,12 +341,18 @@ const uint8_t* SecureApplicationLayer::toolKey(uint16_t devAddr)
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const uint8_t* SecureApplicationLayer::p2pKey(uint16_t addressIndex)
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{
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if (!_secIfObj.isLoaded())
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return nullptr;
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// TODO
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return _secIfObj.propertyData(PID_P2P_KEY_TABLE);
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}
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const uint8_t* SecureApplicationLayer::groupKey(uint16_t addressIndex)
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{
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if (!_secIfObj.isLoaded())
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return nullptr;
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// TODO
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return _secIfObj.propertyData(PID_GRP_KEY_TABLE);
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}
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@ -415,9 +438,7 @@ void SecureApplicationLayer::sendSyncResponse(uint16_t dstAddr, bool dstAddrIsGr
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void SecureApplicationLayer::receivedSyncRequest(uint16_t srcAddr, uint16_t dstAddr, bool dstAddrIsGroupAddr, bool toolAccess, uint8_t* seqNum, long challenge)
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{
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uint64_t nextRemoteSeqNum = ((uint64_t)seqNum[0] << 40) | ((uint64_t)seqNum[1] << 32) | ((uint64_t)seqNum[2] << 24) |
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((uint64_t)seqNum[3] << 16) | ((uint64_t)seqNum[4] << 8) | (uint64_t)seqNum[5];
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uint64_t nextRemoteSeqNum = toUInt64(seqNum, 6);
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uint64_t nextSeqNum = 1 + lastValidSequenceNumber(toolAccess, srcAddr);
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if (nextRemoteSeqNum > nextSeqNum)
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@ -433,6 +454,33 @@ void SecureApplicationLayer::receivedSyncRequest(uint16_t srcAddr, uint16_t dstA
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sendSyncResponse(toAddr, toIsGroupAddress, toolAccess, nextSeqNum);
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}
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void SecureApplicationLayer::receivedSyncResponse(uint16_t remoteAddr, bool toolAccess, uint8_t* plainApdu)
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{
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// final var request = pendingSyncRequests.get(remote);
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// if (request == null)
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// return;
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// Bytes 0-5 in the "APDU" buffer contain the remote sequence number
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// Bytes 6-11 in the "APDU" buffer contain the local sequence number
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uint64_t remoteSeq = toUInt64(plainApdu + 0, 6);
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uint64_t localSeq = toUInt64(plainApdu + 6, 6 + 6);
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uint64_t last = lastValidSequenceNumber(toolAccess, remoteAddr);
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if (remoteSeq - 1 > last)
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{
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//logger.debug("sync.res update {} last valid {} seq -> {}", remote, toolAccess ? "tool access" : "p2p", remoteSeq -1);
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updateLastValidSequence(toolAccess, remoteAddr, remoteSeq - 1);
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}
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uint64_t next = nextSequenceNumber(toolAccess);
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if (localSeq > next) {
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//logger.debug("sync.res update local next {} seq -> {}", toolAccess ? "tool access" : "p2p", localSeq);
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updateSequenceNumber(toolAccess, localSeq);
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}
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//syncRequestCompleted(request);
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}
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bool SecureApplicationLayer::decrypt(uint8_t* plainApdu, uint16_t srcAddr, uint16_t dstAddr, bool dstAddrIsGroupAddr, uint8_t tpci, uint8_t* secureAsdu, uint16_t secureAdsuLength)
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{
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uint8_t extendedFrameFormat = 0;
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@ -442,21 +490,20 @@ bool SecureApplicationLayer::decrypt(uint8_t* plainApdu, uint16_t srcAddr, uint1
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pBuf = popByte(scf, secureAsdu);
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bool toolAccess = ((scf & 0x80) == 0x80);
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bool systemBroadcast = ((scf & 0x08) == 0x08);
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uint8_t sai = (scf >> 4) & 0x07; // sai can only be 0x0 (CCM auth only) or 0x1 (CCM with auth+conf), other values are reserved
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bool authOnly = ( sai == 0);
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uint8_t service = (scf & 0x07); // only 0x0 (S-A_Data-PDU), 0x2 (S-A_Sync_Req-PDU) or 0x3 (S-A_Sync_Rsp-PDU) are valid values
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bool toolAccess = ((scf & 0x80) == 0x80);
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bool systemBroadcast = ((scf & 0x08) == 0x08);
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uint8_t sai = (scf >> 4) & 0x07; // sai can only be 0x0 (CCM auth only) or 0x1 (CCM with auth+conf), other values are reserved
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bool authOnly = ( sai == 0);
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uint8_t service = (scf & 0x07); // only 0x0 (S-A_Data-PDU), 0x2 (S-A_Sync_Req-PDU) or 0x3 (S-A_Sync_Rsp-PDU) are valid values
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bool syncReq = service == SecureSyncRequest;
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bool syncRes = service == SecureSyncResponse;
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uint8_t* key = dstAddrIsGroupAddr ? securityKey(dstAddr) : toolAccess ? toolKey(srcAddr == _deviceObj.induvidualAddress() ? dstAddr : srcAddr) : securityKey(srcAddr);
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const uint8_t* key = dstAddrIsGroupAddr ? securityKey(dstAddr, dstAddrIsGroupAddr) : toolAccess ? toolKey(srcAddr == _deviceObj.induvidualAddress() ? dstAddr : srcAddr) : securityKey(srcAddr, false);
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uint8_t seqNum[6];
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pBuf = popByteArray(seqNum, 6, pBuf);
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uint64_t receivedSeqNumber = ((uint64_t)seqNum[0] << 40) | ((uint64_t)seqNum[1] << 32) | ((uint64_t)seqNum[2] << 24) |
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((uint64_t)seqNum[3] << 16) | ((uint64_t)seqNum[4] << 8) | (uint64_t)seqNum[5];
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uint64_t receivedSeqNumber = toUInt64(seqNum, 6);
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// Provide array for KNX serial number if it is a SyncRequest
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// DataService and SyncResponse do not use this variable.
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@ -530,7 +577,7 @@ bool SecureApplicationLayer::decrypt(uint8_t* plainApdu, uint16_t srcAddr, uint1
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// APDU is already plain, no decryption needed
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// Only check the MAC
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uint32_t calculatedMac = calcAuthOnlyMac(plainApdu, apduLength, _key, iv, ctr0);
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uint32_t calculatedMac = calcAuthOnlyMac(plainApdu, apduLength, key, iv, ctr0);
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if (calculatedMac != mac)
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{
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// security failure
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@ -560,7 +607,7 @@ bool SecureApplicationLayer::decrypt(uint8_t* plainApdu, uint16_t srcAddr, uint1
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pushByteArray(plainApdu, apduLength, &buffer[4]); // apdu is still encrypted
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struct AES_ctx ctx;
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AES_init_ctx_iv(&ctx, _key, ctr0);
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AES_init_ctx_iv(&ctx, key, ctr0);
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//AES_CTR_xcrypt_buffer(&ctx, buffer, bufLenPadded);
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AES_CTR_xcrypt_buffer(&ctx, buffer, bufLen);
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@ -575,7 +622,7 @@ bool SecureApplicationLayer::decrypt(uint8_t* plainApdu, uint16_t srcAddr, uint1
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{
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memcpy(&associatedData[1], knxSerialNumber, 6);
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}
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uint32_t calculatedMac = calcConfAuthMac(associatedData, sizeof(associatedData), plainApdu, apduLength, _key, iv);
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uint32_t calculatedMac = calcConfAuthMac(associatedData, sizeof(associatedData), plainApdu, apduLength, key, iv);
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if (calculatedMac != decryptedMac)
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{
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// security failure
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@ -593,13 +640,12 @@ bool SecureApplicationLayer::decrypt(uint8_t* plainApdu, uint16_t srcAddr, uint1
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if (syncReq)
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{
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uint64_t challenge = ((uint64_t)plainApdu[0] << 40) | ((uint64_t)plainApdu[1] << 32) | ((uint64_t)plainApdu[2] << 24) |
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((uint64_t)plainApdu[3] << 16) | ((uint64_t)plainApdu[4] << 8) | (uint64_t)plainApdu[5];
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uint64_t challenge = toUInt64(&plainApdu[0], 6);
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receivedSyncRequest(srcAddr, dstAddr, dstAddrIsGroupAddr, toolAccess, seqNum, challenge);
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}
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else if (syncRes)
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{
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//receivedSyncResponse(srcAddr, toolAccess, plainApdu);
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receivedSyncResponse(srcAddr, toolAccess, plainApdu);
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}
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else
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{
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@ -621,40 +667,138 @@ bool SecureApplicationLayer::decrypt(uint8_t* plainApdu, uint16_t srcAddr, uint1
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return true;
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}
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void SecureApplicationLayer::encrypt(uint8_t* buffer, uint16_t srcAddr, uint16_t dstAddr, bool dstAddrIsGroupAddr, uint8_t tpci, uint8_t* apdu, uint16_t apduLength)
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void SecureApplicationLayer::secure(uint8_t* buffer, uint16_t service, uint16_t srcAddr, uint16_t dstAddr, bool dstAddrIsGroupAddr,
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uint8_t tpci, uint8_t* apdu, uint16_t apduLength, bool toolAccess, bool confidentiality)
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{
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uint8_t scf = 0x90;
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uint8_t seqNum[6] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x04};
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bool authOnly = false;
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uint8_t extendedFrameFormat = 0;
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if (toolAccess)
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{
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if (!confidentiality)
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{
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println("Error: tool access requires auth+conf security");
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return;
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}
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if (dstAddrIsGroupAddr && dstAddr != 0)
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{
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println("Error: tool access requires individual address");
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return;
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}
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}
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const uint8_t* key = toolAccess ? toolKey(_syncReqBroadcast ? _deviceObj.induvidualAddress() : dstAddr) : securityKey(dstAddr, dstAddrIsGroupAddr);
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if (key == nullptr)
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{
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return;
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}
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bool syncReq = service == SecureSyncRequest;
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bool syncRes = service == SecureSyncResponse;
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uint8_t snoLength = syncReq ? 6 : 0;
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//ByteBuffer secureApdu = ByteBuffer.allocate(3 + SeqSize + snoLength + apdu.length + MacSize);
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uint8_t tmpTpci = _transportLayer->getTPCI(dstAddr) | (SecureService >> 8);
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uint8_t* pBuf = buffer;
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pBuf = pushByte(tmpTpci, pBuf); // TPCI
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pBuf = pushByte(SecureService & 0x00FF, pBuf); // APCI
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bool systemBcast = false; // Not implemented yet
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uint8_t scf;
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scf = service;
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scf |= toolAccess ? 0x80 : 0;
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scf |= confidentiality ? 0x10 : 0;
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scf |= systemBcast ? 0x8 : 0;
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pBuf = pushByte(scf, pBuf); // SCF
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uint64_t seqSend = nextSequenceNumber(toolAccess);
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if (seqSend == 0)
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println("0 is not a valid sequence number");
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uint8_t seq[6];
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sixBytes(seqSend, seq);
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if (!syncRes)
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pBuf = pushByteArray(seq, 6, pBuf); // Sequence Number
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// Prepare associated data depending on service (SyncRequest, SyncResponse or just DataService)
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uint8_t associatedData[syncReq ? 7 : 1];
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associatedData[0] = scf;
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if (syncReq)
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{
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// TODO: NYI lookup serial number of target device for SBC sync.req
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uint8_t remoteSerialNo[6] = {0};
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uint8_t emptySerialNo[6] = {0};
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pBuf = pushByteArray(systemBcast ? remoteSerialNo : emptySerialNo, 6, pBuf);
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pushByteArray(_deviceObj.propertyData(PID_SERIAL_NUMBER), 6, &associatedData[1]);
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}
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else if (syncRes)
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{
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// Just for testing
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if (testSeq)
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{
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// Do not use a random number, but a well-known one
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sixBytes(0xaaaaaaaaaaaa, seq);
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}
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else
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{
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// use random number in SyncResponse
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uint64_t randomNumber = 0x000102030405; // TODO: generate random number
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sixBytes(randomNumber, seq);
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}
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// TODO: maybe implement something like std::map for pending SyncRequests?
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//final var request = pendingSyncRequests.remove(dst);
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//if (request == null)
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// throw new KnxSecureException("sending sync.res without corresponding .req");
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// Now XOR the new random SeqNum with the challenge from the SyncRequest
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uint8_t rndXorChallenge[6];
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pushByteArray(seq, 6, rndXorChallenge);
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for (uint8_t i = 0; i < sizeof(rndXorChallenge); i++)
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{
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rndXorChallenge[i] ^= _challenge[i];
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}
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pBuf = pushByteArray(rndXorChallenge, 6, pBuf);
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}
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// For now only 0
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uint8_t extendedFrameFormat = 0;
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// Clear IV buffer
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uint8_t iv[16] = {0x00};
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// Create first block B0 for AES CBC MAC calculation, used as IV later
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block0(iv, seqNum, srcAddr, dstAddr, dstAddrIsGroupAddr, extendedFrameFormat, tpci | (SecureService >> 8), SecureService & 0x00FF, apduLength);
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block0(iv, seq, srcAddr, dstAddr, dstAddrIsGroupAddr, extendedFrameFormat, tpci | (SecureService >> 8), SecureService & 0x00FF, apduLength);
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// Clear block counter0 buffer
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uint8_t ctr0[16] = {0x00};
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// Create first block for block counter 0
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blockCtr0(ctr0, seqNum, srcAddr, dstAddr);
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blockCtr0(ctr0, seq, srcAddr, dstAddr);
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if (authOnly)
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if (confidentiality)
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{
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// Do calculations for AuthOnly
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uint32_t tmpMac = calcAuthOnlyMac(apdu, apduLength, _key, iv, ctr0);
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// Do calculations for Auth+Conf
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uint32_t mac = calcConfAuthMac(associatedData, sizeof(associatedData), apdu, apduLength, key, iv);
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uint8_t tmpBuffer[4 + apduLength];
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pushInt(mac, tmpBuffer);
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pushByteArray(apdu, apduLength, &tmpBuffer[4]);
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struct AES_ctx ctx;
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AES_init_ctx_iv(&ctx, key, ctr0);
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AES_CTR_xcrypt_buffer(&ctx, tmpBuffer, apduLength + 4); // APDU + MAC (4 bytes)
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pBuf = pushByteArray(tmpBuffer + 4, apduLength, pBuf); // Encrypted APDU
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pBuf = pushByteArray(tmpBuffer + 0, 4, pBuf); // Encrypted MAC
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}
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else
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{
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// Do calculations for Auth+Conf
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uint8_t associatedData[1] = {scf};
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uint32_t mac = calcConfAuthMac(associatedData, sizeof(associatedData), apdu, apduLength, _key, iv);
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// Do calculations for AuthOnly
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uint32_t tmpMac = calcAuthOnlyMac(apdu, apduLength, key, iv, ctr0);
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pushInt(mac, buffer);
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pushByteArray(apdu, apduLength, &buffer[4]);
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struct AES_ctx ctx;
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AES_init_ctx_iv(&ctx, _key, ctr0);
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AES_CTR_xcrypt_buffer(&ctx, buffer, apduLength + 4); // APDU + MAC (4 bytes)
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pBuf = pushByteArray(apdu, apduLength, pBuf); // Plain APDU
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pBuf = pushInt(tmpMac, pBuf); // MAC
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}
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}
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@ -52,12 +52,15 @@ class SecureApplicationLayer : public ApplicationLayer
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virtual void dataConnectedRequest(uint16_t tsap, Priority priority, APDU& apdu) override; // apdu must be valid until it was confirmed
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private:
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uint32_t calcAuthOnlyMac(uint8_t* apdu, uint8_t apduLength, uint8_t* key, uint8_t* iv, uint8_t* ctr0);
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uint32_t calcConfAuthMac(uint8_t* associatedData, uint16_t associatedDataLength, uint8_t* apdu, uint8_t apduLength, uint8_t* key, uint8_t* iv);
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uint32_t calcAuthOnlyMac(uint8_t* apdu, uint8_t apduLength, const uint8_t *key, uint8_t* iv, uint8_t* ctr0);
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uint32_t calcConfAuthMac(uint8_t* associatedData, uint16_t associatedDataLength, uint8_t* apdu, uint8_t apduLength, const uint8_t* key, uint8_t* iv);
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void block0(uint8_t* buffer, uint8_t* seqNum, uint16_t indSrcAddr, uint16_t dstAddr, bool dstAddrIsGroupAddr, uint8_t extFrameFormat, uint8_t tpci, uint8_t apci, uint8_t payloadLength);
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void blockCtr0(uint8_t* buffer, uint8_t* seqNum, uint16_t indSrcAddr, uint16_t dstAddr);
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void sixBytes(uint64_t num, uint8_t* toByteArray);
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uint64_t toUInt64(uint8_t* data, uint8_t dataLen);
|
||||
|
||||
const uint8_t *toolKey(uint16_t devAddr);
|
||||
const uint8_t* securityKey(uint16_t addr, bool isGroupAddress);
|
||||
|
||||
@ -77,13 +80,17 @@ class SecureApplicationLayer : public ApplicationLayer
|
||||
|
||||
void sendSyncResponse(uint16_t dstAddr, bool dstAddrIsGroupAddr, bool toolAccess, uint16_t remoteNextSeqNum);
|
||||
void receivedSyncRequest(uint16_t srcAddr, uint16_t dstAddr, bool dstAddrIsGroupAddr, bool toolAccess, uint8_t* seq, long challenge);
|
||||
void receivedSyncResponse(uint16_t remoteAddr, bool toolAccess, uint8_t* plainApdu);
|
||||
|
||||
bool decrypt(uint8_t* plainApdu, uint16_t srcAddr, uint16_t dstAddr, bool dstAddrIsGroupAddr, uint8_t tpci, uint8_t* secureAsdu, uint16_t secureAdsuLength);
|
||||
void encrypt(uint8_t* buffer, uint16_t srcAddr, uint16_t dstAddr, bool dstAddrIsGroupAddr, uint8_t tpci, uint8_t* apdu, uint16_t apduLength);
|
||||
void secure(uint8_t* buffer, uint16_t service, uint16_t srcAddr, uint16_t dstAddr, bool dstAddrIsGroupAddr, uint8_t tpci, uint8_t* apdu, uint16_t apduLength, bool toolAccess, bool confidentiality);
|
||||
|
||||
bool _syncReqBroadcast;
|
||||
uint32_t _lastSyncRes;
|
||||
uint8_t _challenge[6];
|
||||
|
||||
SecurityInterfaceObject& _secIfObj;
|
||||
DeviceObject& _deviceObj;
|
||||
|
||||
bool testSeq {false};
|
||||
};
|
||||
|
||||
@ -22,14 +22,12 @@ SecurityInterfaceObject::SecurityInterfaceObject()
|
||||
if (start == 0)
|
||||
return 1;
|
||||
|
||||
// TODO: implement PID_LOAD_STATE_CONTROL for complete interface object
|
||||
//data[0] = obj->_state;
|
||||
data[0] = obj->_state;
|
||||
return 1;
|
||||
},
|
||||
// WriteCallback of PID_LOAD_STATE_CONTROL
|
||||
[](SecurityInterfaceObject* obj, uint16_t start, uint8_t count, const uint8_t* data) -> uint8_t {
|
||||
// TODO: implement PID_LOAD_STATE_CONTROL for complete interface object
|
||||
//obj->loadEvent(data);
|
||||
obj->_state = (LoadState) data[0];
|
||||
return 1;
|
||||
}),
|
||||
new FunctionProperty<SecurityInterfaceObject>(this, PID_SECURITY_MODE, ReadLv3 | WriteLv0,
|
||||
@ -82,5 +80,10 @@ uint16_t SecurityInterfaceObject::saveSize()
|
||||
return InterfaceObject::saveSize();
|
||||
}
|
||||
|
||||
bool SecurityInterfaceObject::isLoaded()
|
||||
{
|
||||
return _state == LS_LOADED;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
@ -13,7 +13,11 @@ public:
|
||||
const uint8_t* restore(const uint8_t* buffer) override;
|
||||
uint16_t saveSize() override;
|
||||
|
||||
bool isLoaded();
|
||||
|
||||
private:
|
||||
LoadState _state = LS_UNLOADED;
|
||||
|
||||
// Our FDSK
|
||||
static uint8_t _fdsk[];
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue
Block a user