1 files changed, 50 insertions, 0 deletions
diff --git a/src/Agent.Windows/Diagnostics/WindowsPlatformCheck.cs b/src/Agent.Windows/Diagnostics/WindowsPlatformCheck.cs
new file mode 100644
index 0000000..b8ca0ae
--- /dev/null
+++ b/src/Agent.Windows/Diagnostics/WindowsPlatformCheck.cs
@@ -0,0 +1,50 @@
+using System.ComponentModel;
+using System.Security.Principal;
+using Agent.Windows.Network;
+using Agent.Windows.Security;
+
+namespace Agent.Windows.Diagnostics;
+
+public sealed record WindowsPlatformCheckResult(
+    bool IsAdministrator,
+    bool BfeEngineOpen,
+    bool WfpWriteTransaction,
+    bool WfpFilterAddDelete,
+    int? ErrorCode,
+    string? ErrorOperation)
+{
+    public bool Success => IsAdministrator && BfeEngineOpen && WfpWriteTransaction && WfpFilterAddDelete;
+}
+
+public static class WindowsPlatformCheck
+{
+    public static WindowsPlatformCheckResult Run()
+    {
+        using WindowsIdentity identity = WindowsIdentity.GetCurrent();
+        bool administrator = new WindowsPrincipal(identity).IsInRole(WindowsBuiltInRole.Administrator);
+        bool open = false;
+        bool transaction = false;
+        bool filters = false;
+        try
+        {
+            AppContainerProfile profile = AppContainerProfile.EnsureFixed();
+            using WfpDynamicSession session = WfpDynamicSession.Open();
+            open = true;
+            session.ProbeWriteTransaction();
+            transaction = true;
+            IReadOnlyList<ulong> ids = session.ApplyDefaultBlock(profile.Sid);
+            if (ids.Count != 2 || ids.Any(static id => id == 0)) throw new InvalidOperationException("WFP probe did not create both IPv4 and IPv6 filters.");
+            session.RemovePolicy();
+            filters = true;
+            return new(administrator, open, transaction, filters, null, null);
+        }
+        catch (Win32Exception ex)
+        {
+            return new(administrator, open, transaction, filters, ex.NativeErrorCode, ex.Message);
+        }
+        catch (Exception ex) when (ex is UnauthorizedAccessException or InvalidOperationException or IOException)
+        {
+            return new(administrator, open, transaction, filters, ex.HResult, ex.Message);
+        }
+    }
+}