Protect monitoring key and add SSH terminal

docs/roadmap.md

@@ -42,7 +42,7 @@
 - [x] атомарное погашение token;
 - [ ] отзыв и повторная регистрация Node;
 - [ ] подтверждение fingerprint Hub;
-- [ ] защита desktop SSH-ключа через DPAPI.
+- [x] защита desktop SSH-ключа через DPAPI.
 
 ## Этап 4 — управляемые Links
 
@@ -64,8 +64,8 @@
 - [x] короткая локальная история до 240 точек на сервер;
 - [x] встроенный график CPU, RAM и диска;
 - [ ] экспорт диагностики без секретов;
-- [ ] отдельный прямой SSH-терминал;
-- [ ] отдельная terminal identity и подтверждение пользователя;
+- [x] отдельный прямой SSH-терминал;
+- [x] отдельная terminal identity и подтверждение пользователя;
 - [ ] отдельная automation identity для AI-агента.
 
 ## Этап 6 — постоянный control layer

src/ServerMonitorManager.Desktop/MainPage.xaml

@@ -74,6 +74,11 @@
                         Click="SshKeyButton_Click"
                         Icon="Permissions"
                         Label="SSH-ключ" />
+                    <AppBarButton
+                        AutomationProperties.Name="Открыть прямой SSH-терминал"
+                        Click="TerminalButton_Click"
+                        Icon="OpenFile"
+                        Label="Терминал" />
                     <AppBarButton
                         AutomationProperties.Name="Добавить сервер"
                         Click="AddServerButton_Click"

src/ServerMonitorManager.Desktop/MainPage.xaml.cs

@@ -108,6 +108,59 @@ public sealed partial class MainPage : Page
         }
     }
 
+    private async void TerminalButton_Click(object sender, RoutedEventArgs e)
+    {
+        if (ServerList.SelectedItem is not ServerViewModel selected)
+        {
+            ShowInfo("Сервер не выбран", "Выберите сервер, к которому нужно открыть SSH-терминал.", InfoBarSeverity.Warning);
+            return;
+        }
+
+        var userBox = new TextBox
+        {
+            Header = "Unix-пользователь",
+            PlaceholderText = "starik",
+            MinWidth = 360
+        };
+        AutomationProperties.SetName(userBox, "Пользователь интерактивного SSH-терминала");
+        var dialog = new ContentDialog
+        {
+            XamlRoot = XamlRoot,
+            Title = $"SSH-терминал: {selected.Name}",
+            Content = new StackPanel
+            {
+                Spacing = 12,
+                Children =
+                {
+                    new TextBlock
+                    {
+                        Text = "Терминал использует системный OpenSSH и ваши обычные SSH-ключи. Ключ мониторинга с ограниченной командой здесь не применяется.",
+                        TextWrapping = TextWrapping.Wrap
+                    },
+                    userBox
+                }
+            },
+            PrimaryButtonText = "Открыть",
+            CloseButtonText = "Отмена",
+            DefaultButton = ContentDialogButton.Primary
+        };
+
+        if (await dialog.ShowAsync() != ContentDialogResult.Primary)
+        {
+            return;
+        }
+
+        try
+        {
+            _ssh.OpenInteractiveTerminal(selected.Profile, userBox.Text.Trim());
+            ShowInfo("SSH-терминал открыт", $"Подключение к {selected.Profile.Host} запущено от имени {userBox.Text.Trim()}.", InfoBarSeverity.Success);
+        }
+        catch (Exception exception)
+        {
+            ShowInfo("Не удалось открыть SSH-терминал", exception.Message, InfoBarSeverity.Error);
+        }
+    }
+
     private async void AddServerButton_Click(object sender, RoutedEventArgs e)
     {
         try

src/ServerMonitorManager.Desktop/ServerMonitorManager.Desktop.csproj

@@ -56,6 +56,7 @@
     <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.28000.2270" />
     <PackageReference Include="Microsoft.WindowsAppSDK" Version="2.2.0" />
     <PackageReference Include="Microsoft.Windows.SDK.BuildTools.WinApp" Version="0.4.0" />
+    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="10.0.0" />
   </ItemGroup>
 
   <!--

src/ServerMonitorManager.Desktop/SshMonitorService.cs

@@ -1,5 +1,6 @@
 using System.Diagnostics;
 using System.Globalization;
+using System.Security.Cryptography;
 using System.Text.RegularExpressions;
 using Windows.Storage;
 
@@ -26,6 +27,7 @@ public sealed record ServerMetrics(
 public sealed partial class SshMonitorService
 {
     private const string KeyFileName = "server-monitor-manager-ed25519";
+    private const string ProtectedKeySuffix = ".dpapi";
 
     public async Task<string> EnsureKeyPairAsync(CancellationToken cancellationToken = default)
     {
@@ -34,9 +36,11 @@ public sealed partial class SshMonitorService
             CreationCollisionOption.OpenIfExists);
         var privateKeyPath = Path.Combine(keyFolder.Path, KeyFileName);
         var publicKeyPath = privateKeyPath + ".pub";
+        var protectedKeyPath = privateKeyPath + ProtectedKeySuffix;
 
-        if (!File.Exists(privateKeyPath) || !File.Exists(publicKeyPath))
+        if (!File.Exists(publicKeyPath) || (!File.Exists(privateKeyPath) && !File.Exists(protectedKeyPath)))
         {
+            File.Delete(protectedKeyPath);
             var arguments = new[]
             {
                 "-q", "-t", "ed25519", "-a", "64", "-N", string.Empty,
@@ -45,6 +49,15 @@ public sealed partial class SshMonitorService
             await RunProcessAsync(ResolveOpenSshTool("ssh-keygen.exe"), arguments, cancellationToken);
         }
 
+        if (File.Exists(privateKeyPath))
+        {
+            var privateKey = await File.ReadAllBytesAsync(privateKeyPath, cancellationToken);
+            var protectedKey = ProtectedData.Protect(privateKey, null, DataProtectionScope.CurrentUser);
+            await File.WriteAllBytesAsync(protectedKeyPath, protectedKey, cancellationToken);
+            CryptographicOperations.ZeroMemory(privateKey);
+            File.Delete(privateKeyPath);
+        }
+
         return (await File.ReadAllTextAsync(publicKeyPath, cancellationToken)).Trim();
     }
 
@@ -106,7 +119,7 @@ public sealed partial class SshMonitorService
 
         await EnsureKeyPairAsync(cancellationToken);
         var localFolder = ApplicationData.Current.LocalFolder.Path;
-        var privateKeyPath = Path.Combine(localFolder, "ssh", KeyFileName);
+        var privateKeyPath = await MaterializePrivateKeyAsync(cancellationToken);
         var knownHostsPath = Path.Combine(localFolder, "ssh", "known_hosts");
         var target = $"{profile.User}@{profile.Host}";
         var arguments = new[]
@@ -121,10 +134,79 @@ public sealed partial class SshMonitorService
             target,
             command
         };
-        return await RunProcessAsync(
-            ResolveOpenSshTool("ssh.exe"),
-            arguments,
-            cancellationToken);
+        try
+        {
+            return await RunProcessAsync(
+                ResolveOpenSshTool("ssh.exe"),
+                arguments,
+                cancellationToken);
+        }
+        finally
+        {
+            File.Delete(privateKeyPath);
+        }
+    }
+
+    public void OpenInteractiveTerminal(ServerProfileData profile, string terminalUser)
+    {
+        ValidateProfile(profile);
+        if (!SafeUserRegex().IsMatch(terminalUser))
+        {
+            throw new InvalidOperationException("Некорректное имя пользователя терминала.");
+        }
+
+        var ssh = ResolveOpenSshTool("ssh.exe");
+        var sshArguments = new[]
+        {
+            "-p", profile.Port.ToString(CultureInfo.InvariantCulture),
+            $"{terminalUser}@{profile.Host}"
+        };
+        var windowsTerminal = Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+            "Microsoft",
+            "WindowsApps",
+            "wt.exe");
+        var startInfo = new ProcessStartInfo
+        {
+            FileName = File.Exists(windowsTerminal) ? windowsTerminal : ssh,
+            UseShellExecute = true
+        };
+        if (File.Exists(windowsTerminal))
+        {
+            startInfo.ArgumentList.Add("new-tab");
+            startInfo.ArgumentList.Add(ssh);
+        }
+        foreach (var argument in sshArguments)
+        {
+            startInfo.ArgumentList.Add(argument);
+        }
+        _ = Process.Start(startInfo)
+            ?? throw new InvalidOperationException("Не удалось открыть SSH-терминал.");
+    }
+
+    private static async Task<string> MaterializePrivateKeyAsync(CancellationToken cancellationToken)
+    {
+        var localFolder = ApplicationData.Current.LocalFolder.Path;
+        var protectedKeyPath = Path.Combine(localFolder, "ssh", KeyFileName + ProtectedKeySuffix);
+        var protectedKey = await File.ReadAllBytesAsync(protectedKeyPath, cancellationToken);
+        var privateKey = ProtectedData.Unprotect(protectedKey, null, DataProtectionScope.CurrentUser);
+        var temporaryFile = await ApplicationData.Current.TemporaryFolder.CreateFileAsync(
+            $"{KeyFileName}-{Guid.NewGuid():N}",
+            CreationCollisionOption.FailIfExists);
+        try
+        {
+            await File.WriteAllBytesAsync(temporaryFile.Path, privateKey, cancellationToken);
+            return temporaryFile.Path;
+        }
+        catch
+        {
+            File.Delete(temporaryFile.Path);
+            throw;
+        }
+        finally
+        {
+            CryptographicOperations.ZeroMemory(privateKey);
+        }
     }
 
     private static void ValidateProfile(ServerProfileData profile)