1119 lines
38 KiB
C
1119 lines
38 KiB
C
/**
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* MIT License
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*
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* Copyright (c) 2018 Infineon Technologies AG
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE
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*
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*
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* \file DtlsRecordLayer.c
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*
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* \brief This file provides APIs for the record layer functionalities.
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*
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* \addtogroup grOCP
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* @{
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*
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*/
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#include "optiga/common/Util.h"
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#include "optiga/dtls/DtlsRecordLayer.h"
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#ifdef MODULE_ENABLE_DTLS_MUTUAL_AUTH
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///Default size of the window
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#define DEFAULT_WINDOW_SIZE 32
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/// @cond hidden
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//Protocol version for DTLS 1.2
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#define PROTOCOL_VERSION_1_2 0xFEFD
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#define UDP_OVERHEAD 28 //20(IP Header) + 8(UDP Header)
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/**
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* \brief Structure to provide input to DtlsRL_CallBack_ValidateRec.
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*/
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typedef struct sCBValidateRec_d
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{
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///Record Layer
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sRecordLayer_d* psRecordLayer;
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///Input record
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sbBlob_d* psbBlob;
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///Record data
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sRecordData_d* psRecordData;
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}sCBValidateRec_d;
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/// @endcond
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/**
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* \brief Validates the record header and decrypts the fragments if PpsRecData.bEncDecFlag is set
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*/
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_STATIC_H int32_t DtlsRL_Record_ProcessRecord(const sRecordLayer_d* PpsRecordLayer,const sbBlob_d* PpsBlobRecord,sRecordData_d* PpsRecData);
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/**
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* \brief Prepares a record and encrypts the fragment if PpsRecData.bEncDecFlag is set.<br>
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*/
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_STATIC_H int32_t DtlsRL_Record_PrepareRecord(sRecordLayer_d* PpsRecordLayer,const sRecordData_d* PpsRecData,sbBlob_d* PpsBlobRecord);
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/**
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* \brief Callback to validate the record.
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*/
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_STATIC_H int32_t DtlsRL_CallBack_ValidateRec(const Void* PpvParams);
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/**
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* \brief Gets the count of the total number of record in the buffer
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*/
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_STATIC_H int32_t DtlsRL_GetRecordCount(uint8_t* PpbBuffer,uint16_t PwLen,uint8_t* PpbRecCount);
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/**
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*
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* Validates the record header and decrypts the fragments if PpsRecData.bEncDecFlag is set<br>
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* Updates sRecordData_d.dwRecordInfo with information, whether the record is from<br>
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* next epoch or the current epoch.<br>
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* \param[in] PpsRecordLayer Pointer to #sRecordLayer_d structure
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* \param[in] PpsBlobRecord Pointer to a blob containing record
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* \param[out] PpsRecData Pointer to a blob containing processed record
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*
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* \retval #OCP_RL_OK Successful execution
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* \retval #OCP_RL_ERROR Failure in execution
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*
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*/
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_STATIC_H int32_t DtlsRL_Record_ProcessRecord(const sRecordLayer_d* PpsRecordLayer,const sbBlob_d* PpsBlobRecord,sRecordData_d* PpsRecData)
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{
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int32_t i4Status = OCP_RL_ERROR;
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uint16_t wRecvFragLen;
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uint16_t wServerEpoch;
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sbBlob_d sBlobCipherMsg;
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sbBlob_d sBlobPlainMsg;
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uint8_t bContentType;
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uint8_t* pbDecData = NULL;
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uint16_t wInputProtVersion;
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do
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{
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/// @cond hidden
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#define MIN_DEC_PAYLOAD 17 //(1(Min 1 byte cipher text)+ 8(MAC) + 8 (Explicit nonce)))
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/// @endcond
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//Check for zero len blobs
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if((0 == PpsBlobRecord->wLen)||(0 == PpsRecData->psBlobInOutMsg->wLen))
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{
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//Any error code
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i4Status = (int32_t)OCP_RL_INVALID_RECORD_LENGTH;
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break;
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}
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bContentType = PpsBlobRecord->prgbStream[OFFSET_RL_CONTENTTYPE];
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wServerEpoch = Utility_GetUint16(PpsBlobRecord->prgbStream + OFFSET_RL_EPOCH);
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wInputProtVersion = Utility_GetUint16(PpsBlobRecord->prgbStream + OFFSET_RL_PROT_VERSION);
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//Validate protocol version
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#ifdef SUPPORT_OPENSSL
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//Protocol version for DTLS 1.0
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#define PROTOCOL_VERSION_1_0 0xFEFF
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//for Hello verify request, allow DTLS 1.2 ,1.0 as protocol version
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if(*(PpsBlobRecord->prgbStream+LENGTH_RL_HEADER) == 0x03)
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{
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if((PROTOCOL_VERSION_1_2 != wInputProtVersion)&&(PROTOCOL_VERSION_1_0 != wInputProtVersion))
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{
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i4Status = (int32_t)OCP_RL_INVALID_PROTOCOL_VERSION;
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break;
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}
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}
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else
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{
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if(PpsRecordLayer->wTlsVersionInfo != wInputProtVersion)
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{
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i4Status = (int32_t)OCP_RL_INVALID_PROTOCOL_VERSION;
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break;
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}
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}
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#undef PROTOCOL_VERSION_1_0
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#else
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if(PpsRecordLayer->wTlsVersionInfo != wInputProtVersion)
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{
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i4Status = (int32_t)OCP_RL_INVALID_PROTOCOL_VERSION;
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break;
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}
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#endif /*SUPPORT_OPENSSL*/
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wRecvFragLen = Utility_GetUint16(PpsBlobRecord->prgbStream + OFFSET_RL_FRAG_LENGTH);
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//Reset the flag for each record being being processed which indicates
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*PpsRecordLayer->pbDec = 0x00;
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if(CONTENTTYPE_CIPHER_SPEC == bContentType)
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{
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if((wRecvFragLen != 0x01) || ((PpsRecordLayer->wClientNextEpoch != (PpsRecordLayer->wServerEpoch+1))) || (wServerEpoch != 0x00)
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|| (CONTENTTYPE_HANDSHAKE != PpsRecData->bContentType))
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{
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//Error since state has not changed on client side
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i4Status = (int32_t)OCP_RL_BAD_RECORD;
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}
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else
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{
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PpsRecData->bContentType = bContentType;
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*PpsRecordLayer->pbRecvCCSRecord = CCS_RECORD_RECV;
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Utility_Memmove(PpsRecData->psBlobInOutMsg->prgbStream, PpsBlobRecord->prgbStream + OFFSET_RL_FRAGMENT, \
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wRecvFragLen);
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PpsRecData->psBlobInOutMsg->wLen = wRecvFragLen;
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i4Status = OCP_RL_OK;
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}
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break;
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}
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else if((CONTENTTYPE_HANDSHAKE == PpsRecData->bContentType) && (CONTENTTYPE_APP_DATA == bContentType))
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{
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//Error, since content type is Application but no decryption
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i4Status = (int32_t)OCP_RL_BAD_RECORD;
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break;
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}
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//Is Decryption required?
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else if(((ENC_DEC_ENABLED & PpsRecordLayer->bEncDecFlag)== ENC_DEC_ENABLED) &&
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(wServerEpoch == PpsRecordLayer->wClientNextEpoch))
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{
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if(wRecvFragLen < MIN_DEC_PAYLOAD)
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{
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i4Status = (int32_t)OCP_RL_INVALID_DEC_PAYLOAD_LEN;
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break;
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}
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pbDecData = (uint8_t*)OCP_MALLOC(PpsBlobRecord->wLen + OVERHEAD_UPDOWNLINK);
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if(NULL == pbDecData)
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{
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i4Status = (int32_t)OCP_RL_MALLOC_FAILURE;
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break;
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}
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//Copy the data to be decrypted to a offset by OVERHEAD_UPDOWNLINK bytes
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Utility_Memmove((pbDecData + OVERHEAD_UPDOWNLINK), PpsBlobRecord->prgbStream, PpsBlobRecord->wLen);
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//Decrypt data
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sBlobCipherMsg.prgbStream = pbDecData;
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sBlobCipherMsg.wLen = PpsBlobRecord->wLen + OVERHEAD_UPDOWNLINK;
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sBlobPlainMsg.prgbStream = pbDecData;
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sBlobPlainMsg.wLen = sBlobCipherMsg.wLen;
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//Decrypt call back function
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i4Status = PpsRecordLayer->fEncDecRecord(PpsRecordLayer->pEncDecArgs, &sBlobCipherMsg, &sBlobPlainMsg, PpsBlobRecord->wLen);
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if(OCP_CL_OK == i4Status)
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{
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i4Status = OCP_RL_OK;
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PpsRecData->bContentType = bContentType;
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*PpsRecordLayer->pbDec = 0x01;
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//Remove the record header
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PpsRecData->psBlobInOutMsg->wLen = sBlobPlainMsg.wLen - LENGTH_RL_HEADER;
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Utility_Memmove(PpsRecData->psBlobInOutMsg->prgbStream, sBlobPlainMsg.prgbStream + LENGTH_RL_HEADER, \
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PpsRecData->psBlobInOutMsg->wLen);
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}
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OCP_FREE(pbDecData);
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break;
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}
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else
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{
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PpsRecData->bContentType = bContentType;
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//No Decryption, just copy the data
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Utility_Memmove(PpsRecData->psBlobInOutMsg->prgbStream, \
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PpsBlobRecord->prgbStream + OFFSET_RL_FRAGMENT, \
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wRecvFragLen);
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PpsRecData->psBlobInOutMsg->wLen = wRecvFragLen;
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i4Status = OCP_RL_OK;
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}
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}while(0);
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return i4Status;
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}
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/**
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*
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* Prepares a record and encrypts the fragment if PpsRecData.bEncDecFlag is set.<br>
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*
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* \param[in] PpsRecordLayer Pointer to #sRecordLayer_d structure
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* \param[in] PpsRecData Pointer to a blob containing processed record
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* \param[in,out] PpsBlobRecord Pointer to a blob containing record
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*
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* \retval #OCP_RL_OK Successful execution
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* \retval #OCP_RL_ERROR Failure in execution
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*
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*/
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_STATIC_H int32_t DtlsRL_Record_PrepareRecord(sRecordLayer_d* PpsRecordLayer,const sRecordData_d* PpsRecData,sbBlob_d* PpsBlobRecord)
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{
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int32_t i4Status = OCP_RL_ERROR;
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sbBlob_d sBlobPlainMsg;
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sbBlob_d sBlobCipherMsg;
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sUint64 *psClientSeqNumber;
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uint16_t wClientEpoch = 0;
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do
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{
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//Check for zero len blobs
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if((0 == PpsBlobRecord->wLen)||(0 == PpsRecData->psBlobInOutMsg->wLen))
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{
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//Any error code
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i4Status = (int32_t)OCP_RL_INVALID_RECORD_LENGTH;
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break;
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}
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//Client as moved to new state(Change cipher spec is sent) and next state sequence number will be used
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if(PpsRecordLayer->wClientNextEpoch > PpsRecordLayer->wClientEpoch)
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{
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psClientSeqNumber = &PpsRecordLayer->sClientNextSeqNumber;
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wClientEpoch = PpsRecordLayer->wClientNextEpoch;
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}
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else if(PpsRecordLayer->wClientNextEpoch == PpsRecordLayer->wClientEpoch)
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{
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psClientSeqNumber = &PpsRecordLayer->sClientSeqNumber;
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wClientEpoch = PpsRecordLayer->wClientEpoch;
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}
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//Client Next epoch must not be less than current client epoch
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else
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{
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break;
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}
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//Add Content
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PpsBlobRecord->prgbStream[0] = PpsRecData->bContentType;
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//Add Protocol Version
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PpsBlobRecord->prgbStream[OFFSET_RL_PROT_VERSION] = (uint8_t)(PpsRecordLayer->wTlsVersionInfo >> 8);
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PpsBlobRecord->prgbStream[OFFSET_RL_PROT_VERSION+1] = (uint8_t)PpsRecordLayer->wTlsVersionInfo;
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//Add Epoch
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PpsBlobRecord->prgbStream[OFFSET_RL_EPOCH] = (uint8_t)(wClientEpoch >> 8);
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PpsBlobRecord->prgbStream[OFFSET_RL_EPOCH + 1] = (uint8_t)wClientEpoch;
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//Add Sequence Number.
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if((OFFSET_RL_SEQUENCE + LENGTH_RL_SEQUENCE)>PpsBlobRecord->wLen)
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{
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break;
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}
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/// @cond hidden
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#define MAX_HIGH_SEQ_NUM 0x00010000
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/// @endcond
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//Check for window overflow if equal max value
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if((MAX_HIGH_SEQ_NUM == psClientSeqNumber->dwHigherByte) && (0x00 == psClientSeqNumber->dwLowerByte))
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{
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i4Status = (int32_t) OCP_RL_SEQUENCE_OVERFLOW;
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break;
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}
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//GetUint64(&PpsRecordLayer->sClientSeqNumber,PpsBlobRecord->prgbStream+OFFSET_RL_SEQUENCE,LENGTH_RL_SEQUENCE);
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Utility_SetUint16(PpsBlobRecord->prgbStream+OFFSET_RL_SEQUENCE,(uint16_t)psClientSeqNumber->dwHigherByte);
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Utility_SetUint32(PpsBlobRecord->prgbStream+OFFSET_RL_SEQUENCE+2,psClientSeqNumber->dwLowerByte);
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//Add Final Length
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PpsBlobRecord->prgbStream[OFFSET_RL_FRAG_LENGTH] = (uint8_t)(PpsRecData->psBlobInOutMsg->wLen >> 8);
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PpsBlobRecord->prgbStream[OFFSET_RL_FRAG_LENGTH+1] = (uint8_t)PpsRecData->psBlobInOutMsg->wLen;
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//Is Encryption required?
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if((ENC_DEC_ENABLED&PpsRecordLayer->bEncDecFlag)== ENC_DEC_ENABLED)
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{
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//Move the formed Record header by command lib over head(20) number of bytes
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Utility_Memmove(PpsBlobRecord->prgbStream + OVERHEAD_UPDOWNLINK, PpsBlobRecord->prgbStream, LENGTH_RL_HEADER);
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//Copy the data to be encrypted
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Utility_Memmove(PpsBlobRecord->prgbStream + LENGTH_RL_HEADER + OVERHEAD_UPDOWNLINK,
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PpsRecData->psBlobInOutMsg->prgbStream, PpsRecData->psBlobInOutMsg->wLen);
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sBlobPlainMsg.prgbStream = PpsBlobRecord->prgbStream;
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sBlobPlainMsg.wLen = PpsRecData->psBlobInOutMsg->wLen + LENGTH_RL_HEADER + OVERHEAD_UPDOWNLINK;
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sBlobCipherMsg.prgbStream = PpsBlobRecord->prgbStream;
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sBlobCipherMsg.wLen = PpsBlobRecord->wLen;
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//Encrypt data
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i4Status = PpsRecordLayer->fEncDecRecord(PpsRecordLayer->pEncDecArgs, &sBlobPlainMsg, &sBlobCipherMsg,
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(PpsRecData->psBlobInOutMsg->wLen + LENGTH_RL_HEADER));
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if(OCP_CL_OK == i4Status)
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{
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i4Status = OCP_RL_OK;
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PpsBlobRecord->wLen = sBlobCipherMsg.wLen;
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}
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}
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else
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{
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if(CONTENTTYPE_CIPHER_SPEC == PpsRecData->bContentType)
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{
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PpsRecordLayer->wClientNextEpoch++ ;
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PpsRecordLayer->bEncDecFlag = 0xB5;
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}
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if(FALSE == PpsRecData->bMemoryAllocated)
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{
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//No encryption, just copy the data
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Utility_Memmove(PpsBlobRecord->prgbStream + OFFSET_RL_FRAGMENT,
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PpsRecData->psBlobInOutMsg->prgbStream,
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PpsRecData->psBlobInOutMsg->wLen);
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}
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PpsBlobRecord->wLen = PpsRecData->psBlobInOutMsg->wLen + LENGTH_RL_HEADER;
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i4Status = OCP_RL_OK;
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}
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//Update final length on success
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if(OCP_RL_OK != i4Status)
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{
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PpsBlobRecord->wLen = 0;
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break;
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}
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i4Status = IncrementUint64(psClientSeqNumber);
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if(UTIL_SUCCESS == i4Status)
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{
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i4Status = OCP_RL_OK;
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}
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}while(0);
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/// @cond hidden
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#undef RECORDSEQ_HIGH
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/// @endcond
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return i4Status;
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}
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/**
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* \brief Callback to validate the record.
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*/
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_STATIC_H int32_t DtlsRL_CallBack_ValidateRec(const Void* PpvParams)
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{
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/// @cond hidden
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#define CB_PARAMS ((sCBValidateRec_d*)PpvParams)
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/// @endcond
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return DtlsRL_Record_ProcessRecord(CB_PARAMS->psRecordLayer,CB_PARAMS->psbBlob,CB_PARAMS->psRecordData);
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/// @cond hidden
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#undef CB_PARAMS
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/// @endcond
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}
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/**
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* \brief Callback to Change the server epoch state and reset the change cipher spec receive flag.
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*/
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_STATIC_H Void DtlsRL_CB_ChangeServerState(const Void* PpCBParams)
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{
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/// @cond hidden
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#define S_RECORDLAYER ((sRecordLayer_d*)(((sCBStateTrn_d*)PpCBParams)->phRLHdl))
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/// @endcond
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S_RECORDLAYER->wServerEpoch++;
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*S_RECORDLAYER->pbRecvCCSRecord = CCS_RECORD_NOTRECV;
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/// @cond hidden
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#undef S_RECORDLAYER
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/// @endcond
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}
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/**
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* Gets the count of the total number of record in the buffer.<br>
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*
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* \param[in,out] PpbBuffer Pointer to buffer containing the records.
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* \param[in] PwLen Length of the buffer.
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* \param[in,out] PpbRecCount Pointer to record count value.
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*
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* \retval #OCP_RL_OK Successful execution
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* \retval #OCP_RL_ERROR Failure in execution
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*
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*/
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_STATIC_H int32_t DtlsRL_GetRecordCount(uint8_t* PpbBuffer,uint16_t PwLen,uint8_t* PpbRecCount)
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{
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int32_t i4Status = OCP_RL_ERROR;
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uint8_t* pbRecPtr = PpbBuffer;
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uint16_t wRemainingLen = PwLen;
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uint16_t wRecLen = 0;
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*PpbRecCount = 0;
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do
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{
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//Check for remaining length
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if(wRemainingLen > LENGTH_RL_HEADER)
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{
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//Content type check
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if((*pbRecPtr != CONTENTTYPE_CIPHER_SPEC) &&
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(*pbRecPtr != CONTENTTYPE_ALERT) &&
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(*pbRecPtr != CONTENTTYPE_HANDSHAKE) &&
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(*pbRecPtr != CONTENTTYPE_APP_DATA))
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{
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break;
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}
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//Get the record length
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wRecLen = (uint32_t)Utility_GetUint16(pbRecPtr+OFFSET_RL_FRAG_LENGTH);
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|
|
if((wRecLen+LENGTH_RL_HEADER) > wRemainingLen)
|
|
{
|
|
break;
|
|
}
|
|
(*PpbRecCount)++;
|
|
wRemainingLen -= (wRecLen + LENGTH_RL_HEADER);
|
|
pbRecPtr += (wRecLen + LENGTH_RL_HEADER);
|
|
i4Status = OCP_RL_OK;
|
|
}
|
|
else
|
|
{
|
|
i4Status = (int32_t)OCP_RL_OK;
|
|
break;
|
|
}
|
|
}while(TRUE);
|
|
|
|
if(0 == (*PpbRecCount))
|
|
{
|
|
i4Status = OCP_RL_ERROR;
|
|
}
|
|
return i4Status;
|
|
}
|
|
|
|
/**
|
|
* Adds record header and sends the record over the transport layer.<br>
|
|
* Based on the input provided in PpsRecordLayer->bMemoryAllocated,the function decides whether to allocate
|
|
* memory for the record or not.
|
|
* For internal handshake implementation, memory is already allocated by Handshake layer.
|
|
* In case of Application layer, memory should be allocated here.
|
|
*
|
|
* \param[in] PpsRecordLayer Pointer to #sRecordLayer_d structure.
|
|
* \param[in] PpbData Pointer to a Data to be sent.
|
|
* \param[in] PwDataLen Pointer to length of data to be sent.
|
|
*
|
|
* \retval #OCP_RL_OK Successful execution
|
|
* \retval #OCP_RL_ERROR Failure in execution
|
|
*
|
|
*/
|
|
int32_t DtlsRL_Send(sRL_d* PpsRecordLayer,uint8_t* PpbData,uint16_t PwDataLen)
|
|
{
|
|
int32_t i4Status = OCP_RL_ERROR;
|
|
sRecordData_d sRecordData;
|
|
uint8_t* pbTotalFragMem = NULL;
|
|
uint8_t* pbEncData = NULL;
|
|
sbBlob_d sBlobData;
|
|
sbBlob_d sRecordBlobData;
|
|
/// @cond hidden
|
|
#define S_RECORDLAYER ((sRecordLayer_d*)(PpsRecordLayer->phRLHdl))
|
|
|
|
/// @endcond
|
|
do
|
|
{
|
|
//If Flight 5 is retransmitted.Reset the value to previous state
|
|
if(PpsRecordLayer->fRetransmit == TRUE)
|
|
{
|
|
S_RECORDLAYER->wClientNextEpoch--;
|
|
S_RECORDLAYER->bEncDecFlag = 0x00;
|
|
PpsRecordLayer->fRetransmit = FALSE;
|
|
}
|
|
|
|
if(TRUE == PpsRecordLayer->bMemoryAllocated)
|
|
{
|
|
//In case of Handshake
|
|
//Form struture, point to message Data
|
|
sRecordData.bContentType = PpsRecordLayer->bContentType;
|
|
sRecordData.psBlobInOutMsg = &sRecordBlobData;
|
|
sRecordData.psBlobInOutMsg->prgbStream = PpbData+LENGTH_RL_HEADER;
|
|
sRecordData.psBlobInOutMsg->wLen = PwDataLen-LENGTH_RL_HEADER;
|
|
|
|
//Client and server are in the same state.Encryption is disabled
|
|
if(S_RECORDLAYER->bEncDecFlag != ENC_DEC_ENABLED)
|
|
{
|
|
sBlobData.prgbStream = PpbData;
|
|
sBlobData.wLen = PwDataLen;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
sRecordData.bContentType = PpsRecordLayer->bContentType;
|
|
sRecordData.psBlobInOutMsg = &sRecordBlobData;
|
|
sRecordData.psBlobInOutMsg->prgbStream = PpbData;
|
|
sRecordData.psBlobInOutMsg->wLen = PwDataLen;
|
|
|
|
if(S_RECORDLAYER->bEncDecFlag != ENC_DEC_ENABLED)
|
|
{
|
|
//Assign Buffer
|
|
pbTotalFragMem = (uint8_t*)OCP_MALLOC(PwDataLen + LENGTH_RL_HEADER);
|
|
if(NULL == pbTotalFragMem)
|
|
{
|
|
i4Status = (int32_t)OCP_RL_MALLOC_FAILURE;
|
|
break;
|
|
}
|
|
sBlobData.prgbStream = pbTotalFragMem;
|
|
sBlobData.wLen = PwDataLen + LENGTH_RL_HEADER;
|
|
}
|
|
}
|
|
|
|
//Client as moved to new state and encryption is enabled.Sufficient memory is allocated to store the encrypted data
|
|
if(S_RECORDLAYER->bEncDecFlag == ENC_DEC_ENABLED)
|
|
{
|
|
pbEncData = (uint8_t*)OCP_MALLOC(PwDataLen + LENGTH_RL_HEADER + MAC_LENGTH + EXPLICIT_NOUNCE_LENGTH + OVERHEAD_UPDOWNLINK);
|
|
if(NULL == pbEncData)
|
|
{
|
|
i4Status = (int32_t)OCP_RL_MALLOC_FAILURE;
|
|
break;
|
|
}
|
|
sBlobData.prgbStream = pbEncData;
|
|
sBlobData.wLen = PwDataLen + LENGTH_RL_HEADER + MAC_LENGTH + EXPLICIT_NOUNCE_LENGTH + OVERHEAD_UPDOWNLINK;
|
|
}
|
|
|
|
//Assign function pointer for encryption
|
|
S_RECORDLAYER->fEncDecRecord = PpsRecordLayer->psConfigCL->pfEncrypt;
|
|
S_RECORDLAYER->pEncDecArgs = &(PpsRecordLayer->psConfigCL->sCL);
|
|
|
|
//Add Record
|
|
sRecordData.bMemoryAllocated = PpsRecordLayer->bMemoryAllocated;
|
|
i4Status = DtlsRL_Record_PrepareRecord(S_RECORDLAYER,&sRecordData,&sBlobData);
|
|
if(OCP_RL_OK != i4Status)
|
|
{
|
|
break;
|
|
}
|
|
|
|
//Send the data over transport layer
|
|
i4Status = PpsRecordLayer->psConfigTL->pfSend(&(PpsRecordLayer->psConfigTL->sTL),
|
|
sBlobData.prgbStream,sBlobData.wLen);
|
|
if(OCP_TL_OK != i4Status)
|
|
{
|
|
break;
|
|
}
|
|
i4Status = (int32_t)OCP_RL_OK;
|
|
|
|
}while(FALSE);
|
|
if(FALSE == PpsRecordLayer->bMemoryAllocated)
|
|
{
|
|
OCP_FREE(pbTotalFragMem);
|
|
}
|
|
if(S_RECORDLAYER->bEncDecFlag == ENC_DEC_ENABLED)
|
|
{
|
|
OCP_FREE(pbEncData);
|
|
}
|
|
/// @cond hidden
|
|
#undef S_RECORDLAYER
|
|
/// @endcond
|
|
return i4Status;
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
* To Slide the window to highest set sequence number.
|
|
* If Higher bound reaches a value greater than maximum possible sequence number all the bits greater than
|
|
* maximum sequence number is set to 1 in the window.
|
|
*
|
|
* \param[in,out] PpsRecordLayer Pointer to #sRL_d structure.
|
|
* \param[in] PeAuthState Indicates the state of Mutual Authentication Public Key Scheme (DTLS)
|
|
*
|
|
* \retval #OCP_RL_OK Successful execution
|
|
* \retval #OCP_RL_ERROR Failure in execution
|
|
*
|
|
*/
|
|
void Dtls_SlideWindow(const sRL_d* PpsRecordLayer, eAuthState_d PeAuthState)
|
|
{
|
|
int32_t i4Status = (int32_t)OCP_RL_OK;
|
|
uint8_t bSlideCount = 0;
|
|
uint8_t count = 0;
|
|
uint8_t bLoopCount = 1;
|
|
uint16_t wWordValue;
|
|
uint32_t dwValue;
|
|
sUint64 sBoundValue;
|
|
sWindow_d *psWindow;
|
|
|
|
/// @cond hidden
|
|
#define PS_WINDOW ((sRecordLayer_d*)(PpsRecordLayer->phRLHdl))->psWindow
|
|
#define PS_NEXTWINDOW ((sRecordLayer_d*)(PpsRecordLayer->phRLHdl))->psNextWindow
|
|
/// @endcond
|
|
do
|
|
{
|
|
/// @cond hidden
|
|
#define MAX_LOW_SEQ_NUM 0xFFFFFFFF
|
|
#define RECORDSEQ_HIGH 0xFFFF
|
|
/// @endcond
|
|
if(eAuthCompleted == PeAuthState)
|
|
{
|
|
bLoopCount = 2;
|
|
}
|
|
while(bLoopCount > 0)
|
|
{
|
|
if(bLoopCount > 1)
|
|
{
|
|
psWindow = PS_NEXTWINDOW;
|
|
}
|
|
else
|
|
{
|
|
psWindow = PS_WINDOW;
|
|
}
|
|
//If window size is 32 slide the higher word of the window
|
|
if(32 == psWindow->bWindowSize)
|
|
{
|
|
dwValue = psWindow->sWindowFrame.dwHigherByte;
|
|
//Check for highest bit which is set
|
|
while(count < 32)
|
|
{
|
|
if(LEAST_SIGNIFICANT_BIT_HIGH == (LEAST_SIGNIFICANT_BIT_HIGH & dwValue))
|
|
{
|
|
break;
|
|
}
|
|
dwValue = dwValue >> 1 ;
|
|
count++;
|
|
}
|
|
bSlideCount = psWindow->bWindowSize - count;
|
|
}
|
|
|
|
//If window size is greater then 32
|
|
if(32 < psWindow->bWindowSize)
|
|
{
|
|
//If the value of lower word is greater than zero,than highest bit is set in lower double word
|
|
if(psWindow->sWindowFrame.dwLowerByte > 0)
|
|
{
|
|
//If the value of lower double word is greater then 0xFFFF,then the highest bit is set in MSB 16 bits
|
|
if(psWindow->sWindowFrame.dwLowerByte > 0xFFFF)
|
|
{
|
|
wWordValue = psWindow->sWindowFrame.dwLowerByte >> 16;
|
|
}
|
|
//If the value of lower double word is lesser then 0xFFFF,then the highest bit is set in LSB 16 bits
|
|
else
|
|
{
|
|
bSlideCount+= 16;
|
|
wWordValue = (uint16_t)psWindow->sWindowFrame.dwLowerByte;
|
|
|
|
}
|
|
while(count < 16)
|
|
{
|
|
if(0x0001 == (wWordValue & 0x0001))
|
|
{
|
|
break;
|
|
}
|
|
wWordValue = wWordValue >> 1;
|
|
count++;
|
|
}
|
|
count = 16 - count;
|
|
bSlideCount += count ;
|
|
bSlideCount += (psWindow->bWindowSize - 32);
|
|
}
|
|
//If the value of lower word is lesser than or equal to zero,than highest bit is set in higher double word
|
|
else
|
|
{
|
|
dwValue = psWindow->sWindowFrame.dwHigherByte;
|
|
//Check for highest bit which is set
|
|
while(count < 32)
|
|
{
|
|
if(LEAST_SIGNIFICANT_BIT_HIGH == (LEAST_SIGNIFICANT_BIT_HIGH & dwValue))
|
|
{
|
|
break;
|
|
}
|
|
dwValue = dwValue >> 1 ;
|
|
count++;
|
|
}
|
|
bSlideCount = ((psWindow->bWindowSize - 32) - count);
|
|
}
|
|
}
|
|
|
|
sBoundValue.dwHigherByte = 0x00;
|
|
sBoundValue.dwLowerByte = bSlideCount;
|
|
|
|
//Set the window lower bound to the new value
|
|
i4Status = AddUint64(&psWindow->sLowerBound, &sBoundValue,&psWindow->sLowerBound);
|
|
if(UTIL_SUCCESS != i4Status)
|
|
{
|
|
break;
|
|
}
|
|
|
|
//Set the window higher bound to the new value
|
|
i4Status = AddUint64(&psWindow->sHigherBound, &sBoundValue,&psWindow->sHigherBound);
|
|
if(UTIL_SUCCESS != i4Status)
|
|
{
|
|
break;
|
|
}
|
|
|
|
//Update the window
|
|
psWindow->sWindowFrame.dwLowerByte = 0x00;
|
|
psWindow->sWindowFrame.dwHigherByte = 0x00;
|
|
|
|
//If the Higher bound is greater than maximum value of the sequence number
|
|
if(psWindow->sHigherBound.dwHigherByte > (uint32_t)RECORDSEQ_HIGH)
|
|
{
|
|
sBoundValue.dwHigherByte = RECORDSEQ_HIGH;
|
|
sBoundValue.dwLowerByte = MAX_LOW_SEQ_NUM;
|
|
|
|
//Difference of Higher bound and max sequene number
|
|
i4Status = SubtractUint64(&psWindow->sHigherBound, &sBoundValue, &sBoundValue);
|
|
if(UTIL_SUCCESS != i4Status)
|
|
{
|
|
break;
|
|
}
|
|
|
|
//If 32 bit window
|
|
if(32 == psWindow->bWindowSize)
|
|
{
|
|
psWindow->sWindowFrame.dwHigherByte = MAX_LOW_SEQ_NUM;
|
|
dwValue = 32 - sBoundValue.dwLowerByte;
|
|
while(dwValue--)
|
|
{
|
|
psWindow->sWindowFrame.dwHigherByte = psWindow->sWindowFrame.dwHigherByte >> 1;
|
|
}
|
|
}
|
|
//If window is greater than 32
|
|
else
|
|
{
|
|
psWindow->sWindowFrame.dwLowerByte = MAX_LOW_SEQ_NUM;
|
|
if(sBoundValue.dwLowerByte > 32)
|
|
{
|
|
psWindow->sWindowFrame.dwHigherByte = MAX_LOW_SEQ_NUM;
|
|
|
|
dwValue = psWindow->bWindowSize - sBoundValue.dwLowerByte;
|
|
while(dwValue--)
|
|
{
|
|
psWindow->sWindowFrame.dwHigherByte = psWindow->sWindowFrame.dwHigherByte >> 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
dwValue = 32 - sBoundValue.dwLowerByte;
|
|
while(dwValue--)
|
|
{
|
|
psWindow->sWindowFrame.dwLowerByte = psWindow->sWindowFrame.dwLowerByte >> 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//Reset the count values
|
|
count = 0;
|
|
bSlideCount = 0;
|
|
dwValue = 0;
|
|
wWordValue = 0;
|
|
bLoopCount--;
|
|
}
|
|
}while(FALSE);
|
|
/// @cond hidden
|
|
#undef PS_WINDOW
|
|
#undef PS_NEXTWINDOW
|
|
#undef MAX_SEQ_NUM
|
|
#undef RECORDSEQ_HIGH
|
|
/// @endcond
|
|
|
|
}
|
|
|
|
/**
|
|
* Receives a record over transport layer, performs window check and remove the record header
|
|
* before passing back the data.
|
|
* The function also handles multiple record received in a single datagram by maintaining a count of
|
|
* number of records received.
|
|
* If the count is non-zero then a record is chosen from the given array, otherwise new record is received
|
|
* from the transport layer.
|
|
*
|
|
* \param[in] PpsRecordLayer Pointer to #sRecordLayer_d structure.
|
|
* \param[in,out] PpbBuffer Pointer to buffer to receive data.
|
|
* \param[in,out] PpwLen Pointer to variable containing buffer size and later length of received data.
|
|
*
|
|
* \retval #OCP_RL_OK Successful execution
|
|
* \retval #OCP_RL_ERROR Failure in execution
|
|
*
|
|
*/
|
|
|
|
int32_t DtlsRL_Recv(sRL_d* PpsRecordLayer,uint8_t* PpbBuffer,uint16_t* PpwLen)
|
|
{
|
|
int32_t i4Status = OCP_RL_ERROR;
|
|
sbBlob_d sbBlobCBData;
|
|
sCBValidateRec_d sCBValidateRec;
|
|
sRecordData_d sRecData;
|
|
sbBlob_d sInBlobData;
|
|
sWindow_d *psWindow;
|
|
uint16_t wServerEpoch;
|
|
/// @cond hidden
|
|
#define S_RECORDLAYER ((sRecordLayer_d*)(PpsRecordLayer->phRLHdl))
|
|
/// @endcond
|
|
do
|
|
{
|
|
//If all record not processed, do not call receive
|
|
if(0 == PpsRecordLayer->bMultipleRecord)
|
|
{
|
|
//Receive Data over Transport
|
|
i4Status = PpsRecordLayer->psConfigTL->pfRecv(&(PpsRecordLayer->psConfigTL->sTL),
|
|
PpbBuffer,PpwLen);
|
|
if((int32_t)OCP_TL_NO_DATA == i4Status)
|
|
{
|
|
i4Status = (int32_t)OCP_RL_NO_DATA;
|
|
break;
|
|
}
|
|
if(OCP_TL_OK != i4Status)
|
|
{
|
|
break;
|
|
}
|
|
|
|
if(*PpwLen > (MAX_PMTU - UDP_OVERHEAD))
|
|
{
|
|
i4Status = (int32_t)OCP_RL_INVALID_RECORD_LENGTH;
|
|
break;
|
|
}
|
|
|
|
//Check how many record are available
|
|
i4Status = DtlsRL_GetRecordCount(PpbBuffer,*PpwLen,&(PpsRecordLayer->bMultipleRecord));
|
|
if(OCP_RL_OK != i4Status)
|
|
{
|
|
break;
|
|
}
|
|
|
|
//Copy the received first record to call back input sBlob
|
|
sbBlobCBData.prgbStream = PpbBuffer;
|
|
sbBlobCBData.wLen = LENGTH_RL_HEADER;
|
|
sbBlobCBData.wLen += Utility_GetUint16(sbBlobCBData.prgbStream + OFFSET_RL_FRAG_LENGTH);
|
|
|
|
//Copy the location of the next record
|
|
PpsRecordLayer->pNextRecord = (sbBlobCBData.prgbStream + sbBlobCBData.wLen);
|
|
|
|
//Decrement the record count after a record is copied
|
|
PpsRecordLayer->bMultipleRecord--;
|
|
}
|
|
else
|
|
{
|
|
//For multiple record
|
|
////Copy the received record to call back input sBlob
|
|
sbBlobCBData.prgbStream = PpsRecordLayer->pNextRecord;
|
|
sbBlobCBData.wLen = LENGTH_RL_HEADER;
|
|
sbBlobCBData.wLen += Utility_GetUint16(sbBlobCBData.prgbStream + OFFSET_RL_FRAG_LENGTH);
|
|
|
|
//Copy the location of the next successive record
|
|
PpsRecordLayer->pNextRecord = (sbBlobCBData.prgbStream + sbBlobCBData.wLen);
|
|
|
|
//Decrement the record count after a record is copied
|
|
PpsRecordLayer->bMultipleRecord--;
|
|
}
|
|
|
|
//Assign function pointer for Decryption
|
|
S_RECORDLAYER->fEncDecRecord = PpsRecordLayer->psConfigCL->pfDecrypt;
|
|
S_RECORDLAYER->pEncDecArgs = &(PpsRecordLayer->psConfigCL->sCL);
|
|
|
|
sCBValidateRec.psRecordLayer = S_RECORDLAYER;
|
|
sCBValidateRec.psRecordData = &sRecData;
|
|
|
|
//Get message from received record
|
|
sCBValidateRec.psRecordData->bContentType = PpsRecordLayer->bContentType;
|
|
sCBValidateRec.psRecordData->psBlobInOutMsg = &sInBlobData;
|
|
sCBValidateRec.psRecordData->psBlobInOutMsg->prgbStream = PpbBuffer;
|
|
sCBValidateRec.psRecordData->psBlobInOutMsg->wLen = *PpwLen;
|
|
|
|
|
|
S_RECORDLAYER->sServerSeqNumber.dwHigherByte = (uint32_t)Utility_GetUint16 (sbBlobCBData.prgbStream + OFFSET_RL_SEQUENCE);
|
|
S_RECORDLAYER->sServerSeqNumber.dwLowerByte = Utility_GetUint32 (sbBlobCBData.prgbStream + OFFSET_RL_SEQUENCE + 2);
|
|
|
|
//Pass received Record
|
|
sCBValidateRec.psbBlob = &sbBlobCBData;
|
|
|
|
//Validate epoch
|
|
//Ignore record,If received epoch less than current epoch or
|
|
//received epoch is one greater than current epoch.
|
|
wServerEpoch = Utility_GetUint16 (sbBlobCBData.prgbStream + OFFSET_RL_EPOCH);
|
|
if((S_RECORDLAYER->wServerEpoch > wServerEpoch)||
|
|
(1 + S_RECORDLAYER->wServerEpoch) < wServerEpoch)
|
|
{
|
|
i4Status = (int32_t)OCP_RL_INCORRECT_EPOCH;
|
|
break;
|
|
}
|
|
|
|
//If epoch is one greater than current epoch and Server has not moved to new epoch
|
|
if((1 == (wServerEpoch-S_RECORDLAYER->wServerEpoch)) && (S_RECORDLAYER->wClientNextEpoch != wServerEpoch))
|
|
{
|
|
i4Status = (int32_t)OCP_RL_INCORRECT_EPOCH;
|
|
break;
|
|
}
|
|
|
|
//If the Client and server are in the same state use the current window for record sequence filtering
|
|
if(wServerEpoch == S_RECORDLAYER->wClientEpoch)
|
|
{
|
|
psWindow = S_RECORDLAYER->psWindow;
|
|
}
|
|
//If Server as moved to the new state (Change cipher spec is already sent from server) use the new window for record sequence filtering
|
|
else if(wServerEpoch == (S_RECORDLAYER->wClientEpoch + 1))
|
|
{
|
|
psWindow = S_RECORDLAYER->psNextWindow;
|
|
}
|
|
//Error if server epoch is less then client epoch
|
|
else
|
|
{
|
|
i4Status = (int32_t)OCP_RL_INCORRECT_EPOCH;
|
|
break;
|
|
}
|
|
|
|
psWindow->fValidateRecord = DtlsRL_CallBack_ValidateRec;
|
|
psWindow->pValidateArgs = (Void*)&sCBValidateRec;
|
|
|
|
psWindow->sRecvSeqNumber.dwHigherByte = S_RECORDLAYER->sServerSeqNumber.dwHigherByte;
|
|
psWindow->sRecvSeqNumber.dwLowerByte = S_RECORDLAYER->sServerSeqNumber.dwLowerByte;
|
|
|
|
i4Status = DtlsCheckReplay(psWindow);
|
|
|
|
if(((int32_t)CMD_LIB_DECRYPT_FAILURE == i4Status) || ((int32_t)OCP_RL_MALLOC_FAILURE == i4Status))
|
|
{
|
|
break;
|
|
}
|
|
else if((int32_t)OCP_RL_WINDOW_IGNORE != i4Status)
|
|
{
|
|
|
|
*PpwLen = sCBValidateRec.psRecordData->psBlobInOutMsg->wLen;
|
|
if( CONTENTTYPE_ALERT == sCBValidateRec.psRecordData->bContentType)
|
|
{
|
|
i4Status = (int32_t)OCP_RL_ALERT_RECEIVED;
|
|
}
|
|
else if(CONTENTTYPE_APP_DATA == sCBValidateRec.psRecordData->bContentType)
|
|
{
|
|
i4Status = (int32_t)OCP_RL_APPDATA_RECEIVED;
|
|
}
|
|
else
|
|
{
|
|
i4Status = (int32_t)OCP_RL_OK;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
i4Status = (int32_t)OCP_RL_ERROR;
|
|
}
|
|
//if window slide refresh buffer to removed old sequence number
|
|
}while(FALSE);
|
|
/// @cond hidden
|
|
#undef S_RECORDLAYER
|
|
/// @endcond
|
|
return i4Status;
|
|
}
|
|
|
|
|
|
/**
|
|
* Initialise the DTLS Record Layer
|
|
* \param[in,out] PpsRL Pointer to #sRecordLayer_d structure.
|
|
*
|
|
* \retval #OCP_RL_OK Successful execution
|
|
* \retval #OCP_RL_ERROR Failure in execution
|
|
*
|
|
*/
|
|
int32_t DtlsRL_Init(sRL_d* PpsRL)
|
|
{
|
|
int32_t i4Status = OCP_RL_ERROR;
|
|
|
|
do
|
|
{
|
|
PpsRL->phRLHdl = (sRecordLayer_d*)OCP_MALLOC(sizeof(sRecordLayer_d));
|
|
if(NULL == PpsRL->phRLHdl)
|
|
{
|
|
i4Status = (int32_t)OCP_RL_MALLOC_FAILURE;
|
|
break;
|
|
}
|
|
memset(PpsRL->phRLHdl, 0x00, sizeof(sRecordLayer_d));
|
|
|
|
/// @cond hidden
|
|
#define S_RECORDLAYER ((sRecordLayer_d*)(PpsRL->phRLHdl))
|
|
#define PS_WINDOW (S_RECORDLAYER->psWindow)
|
|
#define PS_NEXTWINDOW (S_RECORDLAYER->psNextWindow)
|
|
/// @endcond
|
|
|
|
S_RECORDLAYER->psWindow = NULL;
|
|
S_RECORDLAYER->psNextWindow = NULL;
|
|
S_RECORDLAYER->bEncDecFlag = 0;
|
|
S_RECORDLAYER->wClientEpoch = 0;
|
|
S_RECORDLAYER->wClientNextEpoch = 0;
|
|
PpsRL->bDecRecord = 0;
|
|
PpsRL->bRecvCCSRecord = CCS_RECORD_NOTRECV;
|
|
S_RECORDLAYER->pbDec = &PpsRL->bDecRecord;
|
|
S_RECORDLAYER->pbRecvCCSRecord = &PpsRL->bRecvCCSRecord;
|
|
PpsRL->fServerStateTrn = DtlsRL_CB_ChangeServerState;
|
|
|
|
|
|
S_RECORDLAYER->wTlsVersionInfo = PROTOCOL_VERSION_1_2;//0xFE,0xFD
|
|
|
|
PpsRL->fRetransmit = FALSE;
|
|
PpsRL->bMultipleRecord = 0x00;
|
|
S_RECORDLAYER->psWindow = (sWindow_d*)OCP_MALLOC(sizeof(sWindow_d));
|
|
if(NULL == S_RECORDLAYER->psWindow)
|
|
{
|
|
i4Status = (int32_t)OCP_RL_MALLOC_FAILURE;
|
|
break;
|
|
}
|
|
memset(S_RECORDLAYER->psWindow, 0x00, sizeof(sWindow_d));
|
|
|
|
PS_WINDOW->bWindowSize = DEFAULT_WINDOW_SIZE;
|
|
PS_WINDOW->sHigherBound.dwLowerByte = PS_WINDOW->bWindowSize - 1;
|
|
PS_WINDOW->sHigherBound.dwHigherByte = 0x00;
|
|
|
|
S_RECORDLAYER->psNextWindow = (sWindow_d*)OCP_MALLOC(sizeof(sWindow_d));
|
|
if(NULL == S_RECORDLAYER->psNextWindow)
|
|
{
|
|
i4Status = (int32_t)OCP_RL_MALLOC_FAILURE;
|
|
break;
|
|
}
|
|
memset(S_RECORDLAYER->psNextWindow, 0x00, sizeof(sWindow_d));
|
|
|
|
PS_NEXTWINDOW->bWindowSize = DEFAULT_WINDOW_SIZE;
|
|
PS_NEXTWINDOW->sHigherBound.dwLowerByte = PS_WINDOW->bWindowSize - 1;
|
|
PS_NEXTWINDOW->sHigherBound.dwHigherByte = 0x00;
|
|
|
|
PS_WINDOW->fValidateRecord = NULL;
|
|
PS_WINDOW->pValidateArgs = NULL;
|
|
|
|
i4Status = OCP_RL_OK;
|
|
}while(FALSE);
|
|
/// @cond hidden
|
|
#undef S_RECORDLAYER
|
|
#undef PS_WINDOW
|
|
#undef PS_NEXTWINDOW
|
|
/// @endcond
|
|
return i4Status;
|
|
}
|
|
|
|
/**
|
|
* This function frees memory held by dtls record layer
|
|
*
|
|
* \param[in] PpsRL Pointer to the record layer structure
|
|
*
|
|
* \return None
|
|
*/
|
|
void DtlsRL_Close(sRL_d* PpsRL)
|
|
{
|
|
/// @cond hidden
|
|
#define PS_WINDOW (((sRecordLayer_d*)PpsRL->phRLHdl)->psWindow)
|
|
#define PS_NEXTWINDOW (((sRecordLayer_d*)PpsRL->phRLHdl)->psNextWindow)
|
|
/// @endcond
|
|
//NULL check
|
|
if(NULL != PpsRL)
|
|
{
|
|
if(NULL != PpsRL->phRLHdl)
|
|
{
|
|
if(NULL != PS_WINDOW)
|
|
{
|
|
//Free the allocated memory for sWindow_d structure
|
|
OCP_FREE(PS_WINDOW);
|
|
|
|
if(NULL != PS_NEXTWINDOW)
|
|
{
|
|
OCP_FREE(PS_NEXTWINDOW);
|
|
PS_NEXTWINDOW = NULL;
|
|
}
|
|
PS_WINDOW = NULL;
|
|
}
|
|
//Free the allocated memory record handle
|
|
OCP_FREE(PpsRL->phRLHdl);
|
|
|
|
PpsRL->phRLHdl = NULL;
|
|
}
|
|
}
|
|
/// @cond hidden
|
|
#undef PS_WINDOW
|
|
#undef PS_NEXTWINDOW
|
|
/// @endcond
|
|
}
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
#endif /*MODULE_ENABLE_DTLS_MUTUAL_AUTH */
|