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thebenternthebentern
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Meshtastic crypto / udp WIP and simulator
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13 files changed

+212
-8
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13 files changed

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‎Directory.Packages.props

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<ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
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</PropertyGroup>
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<ItemGroup>
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<PackageVersion Include="BouncyCastle.Cryptography" Version="2.5.1" />
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<PackageVersion Include="coverlet.collector" Version="6.0.4" />
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<PackageVersion Include="FluentAssertions" Version="7.1.0" />
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<PackageVersion Include="ILogger.Moq" Version="1.1.10" />
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<PackageVersion Include="Google.Protobuf" Version="3.29.3" />
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<PackageVersion Include="Google.Protobuf.Tools" Version="3.29.3" />
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<PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="9.0.1" />
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<PackageVersion Include="Microsoft.Extensions.Logging" Version="9.0.1" />
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<PackageVersion Include="Microsoft.Extensions.Logging.Console" Version="9.0.1" />
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<PackageVersion Include="Microsoft.Extensions.Logging.Debug" Version="9.0.1" />
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<PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
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<PackageVersion Include="Google.Protobuf" Version="3.30.1" />
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<PackageVersion Include="Google.Protobuf.Tools" Version="3.30.1" />
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<PackageVersion Include="Microsoft.Extensions.Hosting" Version="9.0.3" />
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<PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="9.0.3" />
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<PackageVersion Include="Microsoft.Extensions.Logging" Version="9.0.3" />
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<PackageVersion Include="Microsoft.Extensions.Logging.Console" Version="9.0.3" />
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<PackageVersion Include="Microsoft.Extensions.Logging.Debug" Version="9.0.3" />
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<PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
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<PackageVersion Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.21.0" />
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<PackageVersion Include="Moq" Version="4.20.72" />
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<PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />
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<PackageVersion Include="NUnit" Version="4.3.2" />
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<PackageVersion Include="NUnit3TestAdapter" Version="5.0.0" />
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<PackageVersion Include="NUnit.Analyzers" Version="4.6.0" />
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<PackageVersion Include="MQTTnet" Version="5.0.1.1416" />
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<PackageVersion Include="Portable.BouncyCastle" Version="1.9.0" />
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<PackageVersion Include="QRCoder" Version="1.6.0" />
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<PackageVersion Include="SimpleExec" Version="12.0.0" />
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<PackageVersion Include="Spectre.Console" Version="0.49.1" />
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<PackageVersion Include="Spectre.Console.Json" Version="0.49.1" />
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<PackageVersion Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
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<PackageVersion Include="System.IO.Ports" Version="9.0.1" />
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<PackageVersion Include="System.IO.Ports" Version="9.0.3" />
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<PackageVersion Include="YamlDotNet" Version="16.3.0" />
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</ItemGroup>
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</Project>

‎Meshtastic.Simulator.Service/Dockerfile

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# See https://aka.ms/customizecontainer to learn how to customize your debug container and how Visual Studio uses this Dockerfile to build your images for faster debugging.
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# This stage is used when running from VS in fast mode (Default for Debug configuration)
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FROM mcr.microsoft.com/dotnet/runtime:9.0 AS base
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USER $APP_UID
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WORKDIR /app
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# This stage is used to build the service project
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FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
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ARG BUILD_CONFIGURATION=Release
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WORKDIR /src
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COPY ["Directory.Packages.props", "."]
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COPY ["Meshtastic.Simulator.Service/Meshtastic.Simulator.Service.csproj", "Meshtastic.Simulator.Service/"]
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RUN dotnet restore "./Meshtastic.Simulator.Service/Meshtastic.Simulator.Service.csproj"
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COPY . .
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WORKDIR "/src/Meshtastic.Simulator.Service"
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RUN dotnet build "./Meshtastic.Simulator.Service.csproj" -c $BUILD_CONFIGURATION -o /app/build
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# This stage is used to publish the service project to be copied to the final stage
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FROM build AS publish
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ARG BUILD_CONFIGURATION=Release
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RUN dotnet publish "./Meshtastic.Simulator.Service.csproj" -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false
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# This stage is used in production or when running from VS in regular mode (Default when not using the Debug configuration)
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FROM base AS final
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WORKDIR /app
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COPY --from=publish /app/publish .
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ENTRYPOINT ["dotnet", "Meshtastic.Simulator.Service.dll"]

‎Meshtastic.Simulator.Service/Meshtastic.Simulator.Service.csproj

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<Project Sdk="Microsoft.NET.Sdk.Worker">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<Nullable>enable</Nullable>
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<ImplicitUsings>enable</ImplicitUsings>
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<UserSecretsId>dotnet-Meshtastic.Simulator.Service-f04ea7a8-15a0-4fec-b79a-3106e594e1a5</UserSecretsId>
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<DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.Extensions.Hosting" />
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<PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\Meshtastic\Meshtastic.csproj" />
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</ItemGroup>
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</Project>

‎Meshtastic.Simulator.Service/Program.cs

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using Meshtastic.Simulator.Service;
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var builder = Host.CreateApplicationBuilder(args);
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builder.Services.AddHostedService<SimulatorWorker>();
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var host = builder.Build();
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host.Run();

‎Meshtastic.Simulator.Service/Properties/launchSettings.json

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{
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"profiles": {
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"Meshtastic.Simulator.Service": {
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"commandName": "Project",
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"environmentVariables": {
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"DOTNET_ENVIRONMENT": "Development"
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},
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"dotnetRunMessages": true
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},
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"Container (Dockerfile)": {
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"commandName": "Docker"
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}
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},
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"$schema": "https://json.schemastore.org/launchsettings.json"
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}

‎Meshtastic.Simulator.Service/SimulatorWorker.cs

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using Meshtastic.Crypto;
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using Meshtastic.Protobufs;
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using System.Net;
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using System.Net.Sockets;
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namespace Meshtastic.Simulator.Service;
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public class SimulatorWorker(ILogger<SimulatorWorker> logger) : BackgroundService
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{
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private UdpClient? udpClient;
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private IPEndPoint remoteEndpoint = new(IPAddress.Any, Resources.DEFAULT_TCP_PORT);
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protected override async Task ExecuteAsync(CancellationToken stoppingToken)
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{
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while (!stoppingToken.IsCancellationRequested)
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{
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logger.LogDebug("Butt");
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if (udpClient == null)
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{
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udpClient = new UdpClient(Resources.DEFAULT_TCP_PORT)
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{
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EnableBroadcast = true,
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Ttl = 64,
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};
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udpClient.Connect(IPAddress.Parse("224.0.0.69"), Resources.DEFAULT_TCP_PORT);
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}
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if (udpClient.Available > 0)
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{
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var data = udpClient.Receive(ref remoteEndpoint);
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var packet = MeshPacket.Parser.ParseFrom(data);
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var nonce = new NonceGenerator(packet.From, packet.Id).Create();
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byte[] decrypted = PacketEncryption.TransformPacket(packet.Encrypted.Span.ToArray(), nonce, Convert.FromBase64String("AQ=="));
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logger.LogInformation(packet.ToString());
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//udpClient.Send([1], 1, remoteEndpoint); // if data is received reply letting the client know that we got his data
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}
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await Task.Delay(100, stoppingToken);
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}
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}
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}

‎Meshtastic.Simulator.Service/appsettings.Development.json

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{
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"Logging": {
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"LogLevel": {
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"Default": "Information",
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"Microsoft.Hosting.Lifetime": "Information"
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}
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}
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}

‎Meshtastic.Simulator.Service/appsettings.json

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{
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"Logging": {
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"LogLevel": {
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"Default": "Information",
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"Microsoft.Hosting.Lifetime": "Information"
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}
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}
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}

‎Meshtastic.Test/Crypto/PacketCryptoTests.cs

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using Meshtastic.Crypto;
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using Meshtastic.Protobufs;
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namespace Meshtastic.Test.Crypto;
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public class PacketCryptoTests
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{
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[SetUp]
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public void Setup()
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{
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}
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[Test]
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public void TestDefaultKeyDecrypt()
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{
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//{ "packet": { "from": 4202784164, "to": 4294967295, "channel": 8, "encrypted": "kiDV39nDDsi8AON+Czei6zUpy+F/7E+lyIpicxJR40KXBFmPkqFUEnobI5voQadha+s=", "id": 1777428186, "hopLimit": 3, "priority": "BACKGROUND", "hopStart": 3 }, "channelId": "LongFast", "gatewayId": "!fa8165a4" }
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var nonce = new NonceGenerator(4202784164, 1777428186).Create();
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var key = new byte[16] { 0xd4, 0xf1, 0xbb, 0x3a, 0x20, 0x29, 0x07, 0x59, 0xf0, 0xbc, 0xff, 0xab, 0xcf, 0x4e, 0x69, 0x1 };
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var decrypted = PacketEncryption.TransformPacket(Convert.FromBase64String("kiDV39nDDsi8AON+Czei6zUpy+F/7E+lyIpicxJR40KXBFmPkqFUEnobI5voQadha+s="), nonce, key);
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var testMessage = Meshtastic.Protobufs.Data.Parser.ParseFrom(decrypted);
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testMessage.Portnum.Should().Be(PortNum.NodeinfoApp);
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var nodeInfo = User.Parser.ParseFrom(testMessage.Payload);
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nodeInfo.LongName.Should().Be("Meshtastic 65a4");
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}
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}

‎Meshtastic.sln

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Directory.Packages.props = Directory.Packages.props
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EndProjectSection
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Meshtastic.Simulator.Service", "Meshtastic.Simulator.Service\Meshtastic.Simulator.Service.csproj", "{F2226007-E2D7-4832-A94A-C7427EF2A3F1}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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{E48770C0-4390-4B24-B9CB-610E5E7EC68A}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{E48770C0-4390-4B24-B9CB-610E5E7EC68A}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{E48770C0-4390-4B24-B9CB-610E5E7EC68A}.Release|Any CPU.Build.0 = Release|Any CPU
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{F2226007-E2D7-4832-A94A-C7427EF2A3F1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{F2226007-E2D7-4832-A94A-C7427EF2A3F1}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{F2226007-E2D7-4832-A94A-C7427EF2A3F1}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{F2226007-E2D7-4832-A94A-C7427EF2A3F1}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE

‎Meshtastic/Crypto/NonceGenerator.cs

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namespace Meshtastic.Crypto;
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public class NonceGenerator
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{
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private readonly byte[] nonce = new byte[16];
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public NonceGenerator(uint fromNum, ulong packetId)
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{
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InitNonce(fromNum, packetId);
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}
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public byte[] Create() => nonce;
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private void InitNonce(uint fromNode, ulong packetId)
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{
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Array.Clear(nonce, 0, nonce.Length);
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Buffer.BlockCopy(BitConverter.GetBytes(packetId), 0, nonce, 0, sizeof(ulong));
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Buffer.BlockCopy(BitConverter.GetBytes(fromNode), 0, nonce, sizeof(ulong), sizeof(uint));
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}
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}

‎Meshtastic/Crypto/PacketEncryption.cs

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using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Security;
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namespace Meshtastic.Crypto;
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public static class PacketEncryption
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{
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private static readonly IBufferedCipher cipher = CipherUtilities.GetCipher("AES/CTR/NoPadding");
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public static byte[] TransformPacket(byte[] cypherText, byte[] nonce, byte[] key)
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{
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cipher.Init(false, new ParametersWithIV(ParameterUtilities.CreateKeyParameter("AES", key), nonce));
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byte[] output = new byte[cipher.GetOutputSize(cypherText.Length)];
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_ = cipher.DoFinal(cypherText, output);
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return output;
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}
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}

‎Meshtastic/Meshtastic.csproj

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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="BouncyCastle.Cryptography" />
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<PackageReference Include="Google.Protobuf" />
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<PackageReference Include="Google.Protobuf.Tools" />
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<PackageReference Include="Microsoft.Extensions.DependencyInjection" />

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