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xavier-hernandezxavier-hernandez
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‎Program.cs‎

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using System.Net.Sockets;
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using System.Text;
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using Renci.SshNet;
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using Renci.SshNet.Common;
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class Program
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{
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static void Main(string[] args)
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{
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string userName = "dummyUser";
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if (args.Length != 1)
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{
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Console.WriteLine("Usage: SshBatchChecker <targets.txt>");
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Console.WriteLine(" targets.txt should contain lines like 192.168.1.100:22");
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return;
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}
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var filePath = args[0];
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if (!File.Exists(filePath))
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{
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Console.Error.WriteLine($"File not found: {filePath}");
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return;
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}
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foreach (var raw in File.ReadAllLines(filePath))
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{
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var line = raw.Trim();
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if (string.IsNullOrWhiteSpace(line)) continue;
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// split into at most 2 parts
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var parts = line.Split(new[] { ':' }, 2);
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string host;
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int port;
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if (parts.Length == 1)
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{
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// no port specified → use default 22
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host = parts[0];
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port = 22;
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}
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else if (!int.TryParse(parts[1], out port))
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{
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Console.WriteLine($"[INVALID] “{line}” – port is not a number");
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continue;
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}
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else
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{
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host = parts[0];
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}
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if (TryGetSshAuthMethods(host, port, userName, out var methods))
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{
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Console.WriteLine($"[{host}:{port}] SSH detected");
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// Check password auth
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bool allowsPassword = methods.Contains("password");
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Console.WriteLine($"Password authentication:\t{(allowsPassword ? "Allowed" : "Not allowed")}");
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// Check publickey auth
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bool allowsPubKey = methods.Contains("publickey");
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Console.WriteLine($"Public-key authentication:\t{(allowsPubKey ? "Allowed" : "Not allowed")}");
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// (You can add more checks below, e.g. keyboard-interactive, gssapi-…)
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bool allowsKeyboard = methods.Contains("keyboard-interactive");
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Console.WriteLine($"Keyboard-interactive auth:\t{(allowsKeyboard ? "Allowed" : "Not allowed")}");
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Console.WriteLine();
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}
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else
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{
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Console.WriteLine("Not an SSH port or unable to detect auth methods.");
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}
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}
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}
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public static bool TryGetSshAuthMethods(string host, int port, string userName, out string[] supportedMethods)
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{
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supportedMethods = Array.Empty<string>();
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try
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{
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using var tcp = new TcpClient();
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tcp.Connect(host, port);
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using var netStream = tcp.GetStream();
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using var reader = new StreamReader(netStream, Encoding.ASCII, false, 256, leaveOpen: true);
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// The SSH server should immediately send a line like "SSH-2.0-OpenSSH_8.9"
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var banner = reader.ReadLine();
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if (banner == null || !banner.StartsWith("SSH-"))
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return false; // Not SSH :contentReference[oaicite:0]{index=0}
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}
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catch (SocketException)
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{
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return false; // Port closed or not reachable
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}
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var noneAuth = new NoneAuthenticationMethod(userName);
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var connectionInfo = new ConnectionInfo(host, port, userName, noneAuth);
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using var ssh = new SshClient(connectionInfo);
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try
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{
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ssh.Connect(); // This will always throw SshAuthenticationException for "none"
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}
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catch (SshAuthenticationException ex)
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{
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// SSH-2 servers advertise allowed methods by failing the "none" request :contentReference[oaicite:1]{index=1}
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var msg = ex.Message;
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var start = msg.IndexOf('(');
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var end = msg.IndexOf(')');
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if (start >= 0 && end > start)
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{
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var list = msg.Substring(start + 1, end - start - 1);
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supportedMethods = list.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries).Select(m => m.Trim()).ToArray();
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return true;
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}
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}
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return false;
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}
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}

‎Properties/launchSettings.json‎

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{
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"profiles": {
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"SlipperyPete": {
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"commandName": "Project",
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"commandLineArgs": "D:\\temp\\targets.txt"
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}
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}
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}

‎SlipperyPete.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="SSH.NET" Version="2025.0.0" />
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</ItemGroup>
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</Project>

‎SlipperyPete.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.14.36301.6 d17.14
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SlipperyPete", "SlipperyPete.csproj", "{EAF1465A-B818-46E3-9511-C1D269D137FD}"
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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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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{EAF1465A-B818-46E3-9511-C1D269D137FD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{EAF1465A-B818-46E3-9511-C1D269D137FD}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{EAF1465A-B818-46E3-9511-C1D269D137FD}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{EAF1465A-B818-46E3-9511-C1D269D137FD}.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
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {879B7845-C194-42F1-B174-A98437003E00}
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EndGlobalSection
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EndGlobal

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