Add standalone OCSentinel setup executable builder

.gitignore

@@ -10,6 +10,7 @@ payload/
 *.log
 *.zip
 *.sha256
+payload.zip
 SetupAttackTracer.exe
 decompiled/
 msi-admin/

build/build-client-installer.ps1

@@ -0,0 +1,50 @@
+param(
+    [string]$Configuration = "Release"
+)
+
+$ErrorActionPreference = "Stop"
+
+$repoRoot = Split-Path -Parent $PSScriptRoot
+$artifactsRoot = Join-Path $repoRoot "artifacts"
+$zipPath = Join-Path $artifactsRoot "OCSentinelClient-win-x64.zip"
+$bootstrapperRoot = Join-Path $repoRoot "installer\OCSentinelBootstrapper"
+$payloadPath = Join-Path $bootstrapperRoot "payload.zip"
+$projectPath = Join-Path $bootstrapperRoot "OCSentinelBootstrapper.csproj"
+$publishRoot = Join-Path $artifactsRoot "bootstrapper-publish\win-x64"
+$outputExe = Join-Path $artifactsRoot "OCSentinelSetup.exe"
+
+if (-not (Test-Path $zipPath)) {
+    & powershell.exe -ExecutionPolicy Bypass -File (Join-Path $repoRoot "build\build-client-package.ps1") -Configuration $Configuration
+    if ($LASTEXITCODE -ne 0) {
+        throw "build-client-package.ps1 failed"
+    }
+}
+
+Copy-Item -Path $zipPath -Destination $payloadPath -Force
+
+if (Test-Path $publishRoot) {
+    Remove-Item -LiteralPath $publishRoot -Recurse -Force
+}
+
+if (Test-Path $outputExe) {
+    Remove-Item -LiteralPath $outputExe -Force
+}
+
+New-Item -ItemType Directory -Force -Path $publishRoot | Out-Null
+
+& dotnet publish $projectPath `
+    -c $Configuration `
+    -r win-x64 `
+    --self-contained true `
+    -p:PublishSingleFile=true `
+    -p:EnableCompressionInSingleFile=true `
+    -p:IncludeNativeLibrariesForSelfExtract=true `
+    -o $publishRoot
+
+if ($LASTEXITCODE -ne 0) {
+    throw "dotnet publish failed for bootstrapper"
+}
+
+Copy-Item -Path (Join-Path $publishRoot "OCSentinelBootstrapper.exe") -Destination $outputExe -Force
+
+Write-Host "OfficeCom Sentinel setup executable created at $outputExe"

installer/OCSentinelBootstrapper/OCSentinelBootstrapper.csproj

@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0-windows</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <UseWindowsForms>false</UseWindowsForms>
+    <AssemblyName>OCSentinelBootstrapper</AssemblyName>
+    <RootNamespace>OCSentinelBootstrapper</RootNamespace>
+    <PublishSingleFile>true</PublishSingleFile>
+    <SelfContained>true</SelfContained>
+    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
+    <EnableCompressionInSingleFile>true</EnableCompressionInSingleFile>
+    <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Include="payload.zip" LogicalName="payload.zip" />
+  </ItemGroup>
+
+</Project>

installer/OCSentinelBootstrapper/Program.cs

@@ -0,0 +1,76 @@
+using System.Diagnostics;
+using System.IO.Compression;
+using System.Reflection;
+
+namespace OCSentinelBootstrapper;
+
+internal static class Program
+{
+    private static int Main()
+    {
+        string tempRoot = Path.Combine(Path.GetTempPath(), "OCSentinelSetup", Guid.NewGuid().ToString("N"));
+        string zipPath = Path.Combine(tempRoot, "payload.zip");
+        string extractRoot = Path.Combine(tempRoot, "payload");
+
+        try
+        {
+            Directory.CreateDirectory(tempRoot);
+            Directory.CreateDirectory(extractRoot);
+
+            ExtractEmbeddedPayload(zipPath);
+            ZipFile.ExtractToDirectory(zipPath, extractRoot, overwriteFiles: true);
+
+            string installScript = Path.Combine(extractRoot, "scripts", "install-ocsentinel.ps1");
+            if (!File.Exists(installScript))
+            {
+                throw new FileNotFoundException("Embedded payload did not contain install-ocsentinel.ps1", installScript);
+            }
+
+            var process = new Process
+            {
+                StartInfo = new ProcessStartInfo
+                {
+                    FileName = "powershell.exe",
+                    Arguments = $"-ExecutionPolicy Bypass -File \"{installScript}\"",
+                    UseShellExecute = false
+                }
+            };
+
+            process.Start();
+            process.WaitForExit();
+            return process.ExitCode;
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"OCSentinel installer failed: {ex}");
+            return 1;
+        }
+        finally
+        {
+            try
+            {
+                if (Directory.Exists(tempRoot))
+                {
+                    Directory.Delete(tempRoot, recursive: true);
+                }
+            }
+            catch
+            {
+                // Best-effort cleanup only.
+            }
+        }
+    }
+
+    private static void ExtractEmbeddedPayload(string destinationPath)
+    {
+        Assembly assembly = Assembly.GetExecutingAssembly();
+        using Stream? resourceStream = assembly.GetManifestResourceStream("payload.zip");
+        if (resourceStream is null)
+        {
+            throw new InvalidOperationException("Embedded payload.zip resource was not found.");
+        }
+
+        using FileStream output = File.Create(destinationPath);
+        resourceStream.CopyTo(output);
+    }
+}