UDS: Stub SendTo to generate the unencrypted data frame with the right headers.
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@ -144,6 +144,7 @@ set(SRCS
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hle/service/nwm/nwm_tst.cpp
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hle/service/nwm/nwm_uds.cpp
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hle/service/nwm/uds_beacon.cpp
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hle/service/nwm/uds_data.cpp
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hle/service/pm_app.cpp
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hle/service/ptm/ptm.cpp
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hle/service/ptm/ptm_gets.cpp
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@ -341,6 +342,7 @@ set(HEADERS
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hle/service/nwm/nwm_tst.h
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hle/service/nwm/nwm_uds.h
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hle/service/nwm/uds_beacon.h
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hle/service/nwm/uds_data.h
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hle/service/pm_app.h
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hle/service/ptm/ptm.h
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hle/service/ptm/ptm_gets.h
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@ -15,6 +15,7 @@
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#include "core/hle/result.h"
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#include "core/hle/service/nwm/nwm_uds.h"
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#include "core/hle/service/nwm/uds_beacon.h"
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#include "core/hle/service/nwm/uds_data.h"
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#include "core/memory.h"
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namespace Service {
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@ -372,6 +373,71 @@ static void DestroyNetwork(Interface* self) {
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LOG_WARNING(Service_NWM, "called");
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}
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/**
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* NWM_UDS::SendTo service function.
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* Sends a data frame to the UDS network we're connected to.
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* Inputs:
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* 0 : Command header.
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* 1 : Unknown.
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* 2 : u16 Destination network node id.
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* 3 : u8 Data channel.
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* 4 : Buffer size >> 2
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* 5 : Data size
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* 6 : Flags
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* 7 : Input buffer descriptor
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* 8 : Input buffer address
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* Outputs:
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* 0 : Return header
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* 1 : Result of function, 0 on success, otherwise error code
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*/
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static void SendTo(Interface* self) {
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IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x17, 6, 2);
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rp.Skip(1, false);
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u16 dest_node_id = rp.Pop<u16>();
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u8 data_channel = rp.Pop<u8>();
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rp.Skip(1, false);
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u32 data_size = rp.Pop<u32>();
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u32 flags = rp.Pop<u32>();
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size_t desc_size;
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const VAddr input_address = rp.PopStaticBuffer(&desc_size, false);
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ASSERT(desc_size == data_size);
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// TODO(Subv): Figure out the error if this is called while not connected to a network.
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if (connection_status.status == static_cast<u32>(NetworkStatus::ConnectedAsClient) ||
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connection_status.status == static_cast<u32>(NetworkStatus::ConnectedAsHost)) {
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ASSERT_MSG(false, "Not connected to a network (unimplemented)");
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}
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// TODO(Subv): Do something with the flags.
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IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
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constexpr size_t MaxSize = 0x5C6;
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if (data_size > MaxSize) {
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rb.Push(ResultCode(ErrorDescription::TooLarge, ErrorModule::UDS,
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ErrorSummary::WrongArgument, ErrorLevel::Usage));
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return;
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}
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std::vector<u8> data(data_size);
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Memory::ReadBlock(input_address, data.data(), data.size());
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// TODO(Subv): Increment the sequence number after each sent packet.
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u16 sequence_number = 0;
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std::vector<u8> data_frame = GenerateDataFrame(data, data_channel, dest_node_id,
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connection_status.network_node_id,
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sequence_number);
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// TODO(Subv): Send the frame.
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rb.Push(RESULT_SUCCESS);
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LOG_WARNING(Service_NWM, "(STUB) called dest_node_id=%u size=%u flags=%u channel=%u",
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static_cast<u32>(dest_node_id), data_size, flags, static_cast<u32>(data_channel));
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}
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/**
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* NWM_UDS::GetChannel service function.
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* Returns the WiFi channel in which the network we're connected to is transmitting.
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@ -564,7 +630,7 @@ const Interface::FunctionInfo FunctionTable[] = {
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{0x00130040, nullptr, "Unbind"},
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{0x001400C0, nullptr, "PullPacket"},
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{0x00150080, nullptr, "SetMaxSendDelay"},
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{0x00170182, nullptr, "SendTo"},
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{0x00170182, SendTo, "SendTo"},
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{0x001A0000, GetChannel, "GetChannel"},
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{0x001B0302, InitializeWithVersion, "InitializeWithVersion"},
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{0x001D0044, BeginHostingNetwork, "BeginHostingNetwork"},
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@ -0,0 +1,112 @@
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// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <cstring>
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#include "core/hle/service/nwm/nwm_uds.h"
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#include "core/hle/service/nwm/uds_data.h"
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#include "core/hw/aes/key.h"
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#include <cryptopp/aes.h>
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#include <cryptopp/md5.h>
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#include <cryptopp/modes.h>
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namespace Service {
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namespace NWM {
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// AES Keyslot used to generate the UDS data frame CCMP key.
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constexpr size_t UDSDataCryptoAESKeySlot = 0x2D;
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/*
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* Generates a SNAP-enabled 802.2 LLC header for the specified protocol.
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* @returns a buffer with the bytes of the generated header.
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*/
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static std::vector<u8> GenerateLLCHeader(EtherType protocol) {
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LLCHeader header{};
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header.protocol = static_cast<u16>(protocol);
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std::vector<u8> buffer(sizeof(header));
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memcpy(buffer.data(), &header, sizeof(header));
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return buffer;
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}
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/*
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* Generates a Nintendo UDS SecureData header with the specified parameters.
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* @returns a buffer with the bytes of the generated header.
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*/
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static std::vector<u8> GenerateSecureDataHeader(u16 data_size, u8 channel, u16 dest_node_id,
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u16 src_node_id, u16 sequence_number) {
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SecureDataHeader header{};
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header.protocol_size = data_size + sizeof(SecureDataHeader);
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// TODO(Subv): It is likely that the first 4 bytes of this header are actually a decorator for another protocol.
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header.securedata_size = data_size + sizeof(SecureDataHeader) - 4;
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header.is_management = 0; // Frames sent by the emulated application are never UDS management frames
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header.data_channel = channel;
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header.sequence_number = sequence_number;
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header.dest_node_id = dest_node_id;
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header.src_node_id = src_node_id;
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std::vector<u8> buffer(sizeof(header));
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memcpy(buffer.data(), &header, sizeof(header));
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return buffer;
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}
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/*
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* Calculates the CTR used for the AES-CTR process that calculates
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* the CCMP crypto key for data frames.
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* @returns The CTR used for data frames crypto key generation.
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*/
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static std::array<u8, CryptoPP::MD5::DIGESTSIZE> GetDataCryptoCTR(const NetworkInfo& network_info) {
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DataFrameCryptoCTR data{};
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data.host_mac = network_info.host_mac_address;
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data.wlan_comm_id = network_info.wlan_comm_id;
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data.id = network_info.id;
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data.network_id = network_info.network_id;
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std::array<u8, CryptoPP::MD5::DIGESTSIZE> hash;
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CryptoPP::MD5().CalculateDigest(hash.data(), reinterpret_cast<u8*>(&data), sizeof(data));
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return hash;
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}
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/*
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* Generates the key used for encrypting the 802.11 data frames generated by UDS.
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* @returns The key used for data frames crypto.
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*/
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static std::array<u8, CryptoPP::AES::BLOCKSIZE> GenerateDataCCMPKey(const std::vector<u8>& passphrase,
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const NetworkInfo& network_info) {
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// Calculate the MD5 hash of the input passphrase.
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std::array<u8, CryptoPP::MD5::DIGESTSIZE> passphrase_hash;
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CryptoPP::MD5().CalculateDigest(passphrase_hash.data(), passphrase.data(), passphrase.size());
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std::array<u8, CryptoPP::AES::BLOCKSIZE> ccmp_key;
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// The CCMP key is the result of encrypting the MD5 hash of the passphrase with AES-CTR using keyslot 0x2D.
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using CryptoPP::AES;
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std::array<u8, CryptoPP::MD5::DIGESTSIZE> counter = GetDataCryptoCTR(network_info);
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std::array<u8, AES::BLOCKSIZE> key = HW::AES::GetNormalKey(UDSDataCryptoAESKeySlot);
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CryptoPP::CTR_Mode<AES>::Encryption aes;
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aes.SetKeyWithIV(key.data(), AES::BLOCKSIZE, counter.data());
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aes.ProcessData(ccmp_key.data(), passphrase_hash.data(), passphrase_hash.size());
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return ccmp_key;
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}
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std::vector<u8> GenerateDataFrame(const std::vector<u8>& data, u8 channel, u16 dest_node, u16 src_node, u16 sequence_number) {
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std::vector<u8> buffer = GenerateLLCHeader(EtherType::SecureData);
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std::vector<u8> securedata_header = GenerateSecureDataHeader(data.size(), channel, dest_node, src_node, sequence_number);
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buffer.insert(buffer.end(), securedata_header.begin(), securedata_header.end());
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buffer.insert(buffer.end(), data.begin(), data.end());
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// TODO(Subv): Encrypt the frame.
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// TODO(Subv): Prepend CCMP initialization vector (sequence_number).
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// TODO(Subv): Encapsulate the frame in an 802.11 data frame.
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return buffer;
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}
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} // namespace NWM
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} // namespace Service
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@ -0,0 +1,80 @@
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// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include "common/common_types.h"
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#include "common/swap.h"
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#include "core/hle/service/service.h"
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namespace Service {
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namespace NWM {
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enum class SAP : u8 {
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SNAPExtensionUsed = 0xAA
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};
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enum class PDUControl : u8 {
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UnnumberedInformation = 3
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};
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enum class EtherType : u16 {
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SecureData = 0x876D,
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EAPoL = 0x888E
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};
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/*
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* 802.2 header, UDS packets always use SNAP for these headers,
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* which means the dsap and ssap are always SNAPExtensionUsed (0xAA)
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* and the OUI is always 0.
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*/
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struct LLCHeader {
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u8 dsap = static_cast<u8>(SAP::SNAPExtensionUsed);
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u8 ssap = static_cast<u8>(SAP::SNAPExtensionUsed);
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u8 control = static_cast<u8>(PDUControl::UnnumberedInformation);
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std::array<u8, 3> OUI = {};
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u16_be protocol;
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};
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static_assert(sizeof(LLCHeader) == 8, "LLCHeader has the wrong size");
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/*
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* Nintendo SecureData header, every UDS packet contains one,
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* it is used to store metadata about the transmission such as
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* the source and destination network node ids.
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*/
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struct SecureDataHeader {
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u16_be protocol_size;
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INSERT_PADDING_BYTES(2);
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u16_be securedata_size;
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u8 is_management;
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u8 data_channel;
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u16_be sequence_number;
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u16_be dest_node_id;
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u16_be src_node_id;
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};
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static_assert(sizeof(SecureDataHeader) == 14, "SecureDataHeader has the wrong size");
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/*
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* The raw bytes of this structure are the CTR used in the encryption (AES-CTR)
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* process used to generate the CCMP key for data frame encryption.
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*/
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struct DataFrameCryptoCTR {
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u32_le wlan_comm_id;
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u32_le network_id;
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std::array<u8, 6> host_mac;
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u16_le id;
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};
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static_assert(sizeof(DataFrameCryptoCTR) == 16, "DataFrameCryptoCTR has the wrong size");
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/**
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* Generates an encrypted 802.11 data frame starting at the CCMP IV.
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* @returns The generated frame.
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*/
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std::vector<u8> GenerateDataFrame(const std::vector<u8>& data, u8 channel, u16 dest_node, u16 src_node, u16 sequence_number);
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} // namespace NWM
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} // namespace Service
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