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chore: tests for authenticode and version checks
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‎README.md‎

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# Coder Desktop for Windows
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This repo contains the C# source code for Coder Desktop for Windows. You can
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download the latest version from the GitHub releases.
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### Contributing
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You will need:
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- Visual Studio 2022
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- .NET desktop development
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- WinUI application development
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- Windows 10 SDK (10.0.19041.0)
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- Wix Toolset 5.0.2 (if building the installer)
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It's also recommended to use JetBrains Rider (or VS + ReSharper) for a better
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experience.
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### License
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The Coder Desktop for Windows source is licensed under the GNU Affero General
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Public License v3.0 (AGPL-3.0).
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Some vendored files in this repo are licensed separately. The license for these
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files can be found in the same directory as the files.
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The binary distributions of Coder Desktop for Windows have some additional
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license disclaimers that can be found in
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[scripts/files/License.txt](scripts/files/License.txt) or during installation.

‎Tests.Vpn.Service/DownloaderTest.cs‎

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@@ -27,23 +27,29 @@ public class AuthenticodeDownloadValidatorTest
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[CancelAfter(30_000)]
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public void Unsigned(CancellationToken ct)
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{
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// TODO: this
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var testBinaryPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "testdata", "hello.exe");
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var ex = Assert.ThrowsAsync<Exception>(() =>
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AuthenticodeDownloadValidator.Coder.ValidateAsync(testBinaryPath, ct));
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Assert.That(ex.Message, Does.Contain("File is not signed and trusted with an Authenticode signature: State=Unsigned, StateReason=None"));
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}
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[Test(Description = "Test an untrusted binary")]
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[CancelAfter(30_000)]
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public void Untrusted(CancellationToken ct)
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{
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// TODO: this
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var testBinaryPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "testdata", "hello-self-signed.exe");
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var ex = Assert.ThrowsAsync<Exception>(() =>
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AuthenticodeDownloadValidator.Coder.ValidateAsync(testBinaryPath, ct));
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Assert.That(ex.Message, Does.Contain("File is not signed and trusted with an Authenticode signature: State=Unsigned, StateReason=UntrustedRoot"));
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}
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[Test(Description = "Test an binary with a detached signature (catalog file)")]
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[CancelAfter(30_000)]
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public void DifferentCertTrusted(CancellationToken ct)
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{
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// notepad.exe uses a catalog file for its signature.
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// rundll32.exe uses a catalog file for its signature.
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var ex = Assert.ThrowsAsync<Exception>(() =>
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AuthenticodeDownloadValidator.Coder.ValidateAsync(@"C:\Windows\System32\notepad.exe", ct));
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AuthenticodeDownloadValidator.Coder.ValidateAsync(@"C:\Windows\System32\rundll32.exe", ct));
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Assert.That(ex.Message,
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Does.Contain("File is not signed with an embedded Authenticode signature: Kind=Catalog"));
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}
@@ -52,15 +58,19 @@ public void DifferentCertTrusted(CancellationToken ct)
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[CancelAfter(30_000)]
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public void DifferentCertUntrusted(CancellationToken ct)
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{
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// TODO: this
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// dotnet.exe is signed by .NET. During tests we can be pretty sure
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// this is installed.
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var ex = Assert.ThrowsAsync<Exception>(() =>
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AuthenticodeDownloadValidator.Coder.ValidateAsync(@"C:\Program Files\dotnet\dotnet.exe", ct));
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Assert.That(ex.Message, Does.Contain("File is signed by an unexpected certificate: ExpectedName='Coder Technologies Inc.', ActualName='.NET"));
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}
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[Test(Description = "Test a binary signed by Coder's certificate")]
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[CancelAfter(30_000)]
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public async Task CoderSigned(CancellationToken ct)
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{
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// TODO: this
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await Task.CompletedTask;
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var testBinaryPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "testdata", "hello-versioned-signed.exe");
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await AuthenticodeDownloadValidator.Coder.ValidateAsync(testBinaryPath, ct);
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}
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}
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@@ -71,22 +81,57 @@ public class AssemblyVersionDownloadValidatorTest
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[CancelAfter(30_000)]
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public void NoVersion(CancellationToken ct)
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{
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// TODO: this
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var testBinaryPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "testdata", "hello.exe");
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var ex = Assert.ThrowsAsync<Exception>(() =>
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new AssemblyVersionDownloadValidator(1, 2, 3, 4).ValidateAsync(testBinaryPath, ct));
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Assert.That(ex.Message, Does.Contain("File ProductVersion is empty or null"));
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}
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[Test(Description = "Version mismatch")]
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[Test(Description = "Invalid version on binary")]
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[CancelAfter(30_000)]
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public void VersionMismatch(CancellationToken ct)
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public void InvalidVersion(CancellationToken ct)
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{
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// TODO: this
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var testBinaryPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "testdata", "hello-invalid-version.exe");
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var ex = Assert.ThrowsAsync<Exception>(() =>
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new AssemblyVersionDownloadValidator(1, 2, 3, 4).ValidateAsync(testBinaryPath, ct));
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Assert.That(ex.Message, Does.Contain("File ProductVersion '1-2-3-4' is not a valid version string"));
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}
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[Test(Description = "Version mismatch with full version check")]
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[CancelAfter(30_000)]
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public void VersionMismatchFull(CancellationToken ct)
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{
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var testBinaryPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "testdata", "hello-versioned-signed.exe");
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// Try changing each version component one at a time
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var expectedVersions = new[] { 1, 2, 3, 4 };
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for (var i = 0; i < 4; i++)
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{
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var testVersions = (int[])expectedVersions.Clone();
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testVersions[i]++; // Increment this component to make it wrong
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var ex = Assert.ThrowsAsync<Exception>(() =>
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new AssemblyVersionDownloadValidator(
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testVersions[0], testVersions[1], testVersions[2], testVersions[3]
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).ValidateAsync(testBinaryPath, ct));
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Assert.That(ex.Message, Does.Contain(
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$"File ProductVersion does not match expected version: Actual='1.2.3.4', Expected='{string.Join(".", testVersions)}'"));
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}
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}
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[Test(Description = "Version match")]
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[Test(Description = "Version match with and without partial version check")]
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[CancelAfter(30_000)]
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public async Task VersionMatch(CancellationToken ct)
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{
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// TODO: this
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await Task.CompletedTask;
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var testBinaryPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "testdata", "hello-versioned-signed.exe");
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// Test with just major.minor
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await new AssemblyVersionDownloadValidator(1, 2).ValidateAsync(testBinaryPath, ct);
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// Test with major.minor.patch
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await new AssemblyVersionDownloadValidator(1, 2, 3).ValidateAsync(testBinaryPath, ct);
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// Test with major.minor.patch.build
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await new AssemblyVersionDownloadValidator(1, 2, 3, 4).ValidateAsync(testBinaryPath, ct);
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}
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}
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‎Tests.Vpn.Service/Tests.Vpn.Service.csproj‎

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<IsTestProject>true</IsTestProject>
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</PropertyGroup>
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<ItemGroup>
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<None Remove="testdata\hello.go" />
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<None Remove="testdata\winres.json" />
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<None Update="testdata\hello.exe">
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<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
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</None>
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<None Update="testdata\hello-invalid-version.exe">
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<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
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</None>
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<None Update="testdata\hello-self-signed.exe">
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<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
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</None>
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<None Update="testdata\hello-versioned-signed.exe">
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<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
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</None>
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="coverlet.collector" Version="6.0.4">
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<PrivateAssets>all</PrivateAssets>

‎Tests.Vpn.Service/testdata/.gitignore‎

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*.go
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*.pfx

‎Tests.Vpn.Service/testdata/Build-Assets.ps1‎

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$errorActionPreference = "Stop"
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Set-Location $PSScriptRoot
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# If hello.go does not exist, write it. We don't check it into the repo to avoid
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# GitHub showing that the repo contains Go code.
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if (-not (Test-Path "hello.go")) {
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$helloGo = @"
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package main
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func main() {
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println("Hello, World!")
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}
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"@
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Set-Content -Path "hello.go" -Value $helloGo
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}
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& go.exe build -ldflags '-w -s' -o hello.exe hello.go
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if ($LASTEXITCODE -ne 0) { throw "Failed to build hello.exe" }
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# hello-invalid-version.exe is used for testing versioned binaries with an
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# invalid version.
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Copy-Item hello.exe hello-invalid-version.exe
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& go-winres.exe patch --in winres.json --delete --no-backup --product-version 1-2-3-4 --file-version 1-2-3-4 hello-invalid-version.exe
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if ($LASTEXITCODE -ne 0) { throw "Failed to patch hello-invalid-version.exe with go-winres" }
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# hello-self-signed.exe is used for testing untrusted binaries.
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Copy-Item hello.exe hello-self-signed.exe
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$helloSelfSignedPath = (Get-Item hello-self-signed.exe).FullName
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# Create a self signed certificate for signing and then delete it.
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$certStoreLocation = "Cert:\CurrentUser\My"
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$password = "password"
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$cert = New-SelfSignedCertificate `
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-CertStoreLocation $certStoreLocation `
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-DnsName coder.com `
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-Subject "CN=coder-desktop-windows-self-signed-cert" `
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-Type CodeSigningCert `
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-KeyUsage DigitalSignature `
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-NotAfter (Get-Date).AddDays(3650)
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$pfxPath = Join-Path $PSScriptRoot "cert.pfx"
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try {
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$securePassword = ConvertTo-SecureString -String $password -Force -AsPlainText
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Export-PfxCertificate -Cert $cert -FilePath $pfxPath -Password $securePassword
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# Sign hello-self-signed.exe with the self signed certificate
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& "${env:ProgramFiles(x86)}\Windows Kits\10\bin\10.0.19041.0\x64\signtool.exe" sign /debug /f $pfxPath /p $password /tr "http://timestamp.digicert.com" /td sha256 /fd sha256 $helloSelfSignedPath
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if ($LASTEXITCODE -ne 0) { throw "Failed to sign hello-self-signed.exe with signtool" }
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} finally {
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if ($cert.Thumbprint) {
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Remove-Item -Path (Join-Path $certStoreLocation $cert.Thumbprint) -Force
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}
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if (Test-Path $pfxPath) {
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Remove-Item -Path $pfxPath -Force
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}
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}
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# hello-versioned-signed.exe is used for testing versioned binariess and
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# binaries signed by a real EV certificate.
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Copy-Item hello.exe hello-versioned-signed.exe
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& go-winres.exe patch --in winres.json --delete --no-backup --product-version 1.2.3.4 --file-version 1.2.3.4 hello-versioned-signed.exe
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if ($LASTEXITCODE -ne 0) { throw "Failed to patch hello-versioned-signed.exe with go-winres" }
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# Then sign hello-versioned-signed.exe with the same EV cert as our real
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# binaries. Since this is a bit more complicated and requires some extra
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# permissions, we don't do this in the build script.
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Write-Host "Don't forget to sign hello-versioned-signed.exe with the EV cert!"

‎Tests.Vpn.Service/testdata/hello-invalid-version.exe‎

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‎Tests.Vpn.Service/testdata/hello-self-signed.exe‎

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‎Tests.Vpn.Service/testdata/hello-versioned-signed.exe‎

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‎Tests.Vpn.Service/testdata/hello.exe‎

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‎Tests.Vpn.Service/testdata/winres.json‎

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{
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"RT_MANIFEST": {
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"#1": {
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"0409": {
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"identity": {},
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"description": "",
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"minimum-os": "win7",
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"execution-level": "",
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"ui-access": false,
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"auto-elevate": false,
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"dpi-awareness": "system",
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"disable-theming": false,
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"disable-window-filtering": false,
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"high-resolution-scrolling-aware": false,
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"ultra-high-resolution-scrolling-aware": false,
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"long-path-aware": false,
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"printer-driver-isolation": false,
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"gdi-scaling": false,
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"segment-heap": false,
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"use-common-controls-v6": false
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}
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}
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},
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"RT_VERSION": {
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"#1": {
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"0409": {
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"fixed": {
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"file_version": "1.2.3.4",
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"product_version": "1.2.3.4"
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},
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"info": {
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"0409": {
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"FileDescription": "Coder",
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"FileVersion": "1.2.3.4",
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"LegalCopyright": "Copyright 2025 Coder Technologies Inc.",
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"OriginalFilename": "coder.exe",
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"ProductName": "Coder",
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"ProductVersion": "1.2.3.4"
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}
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}
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}
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}
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}
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}

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