Verify with a NTP time source before continuing

MFACodeGenerator/MFACodeGenerator.csproj

@@ -13,6 +13,22 @@
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
     <Deterministic>true</Deterministic>
     <TargetFrameworkProfile />
+    <PublishUrl>C:\Users\curriegrad2004\Desktop\MFAGenerator\</PublishUrl>
+    <Install>true</Install>
+    <InstallFrom>Disk</InstallFrom>
+    <UpdateEnabled>false</UpdateEnabled>
+    <UpdateMode>Foreground</UpdateMode>
+    <UpdateInterval>7</UpdateInterval>
+    <UpdateIntervalUnits>Days</UpdateIntervalUnits>
+    <UpdatePeriodically>false</UpdatePeriodically>
+    <UpdateRequired>false</UpdateRequired>
+    <MapFileExtensions>true</MapFileExtensions>
+    <ApplicationRevision>0</ApplicationRevision>
+    <ApplicationVersion>1.0.0.%2a</ApplicationVersion>
+    <IsWebBootstrapper>false</IsWebBootstrapper>
+    <UseApplicationTrust>false</UseApplicationTrust>
+    <PublishWizardCompleted>true</PublishWizardCompleted>
+    <BootstrapperEnabled>true</BootstrapperEnabled>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -33,7 +49,22 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
+  <PropertyGroup>
+    <ManifestCertificateThumbprint>25959F1C21FCA9FFDED624C1BC14F6D1248B0FDD</ManifestCertificateThumbprint>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ManifestKeyFile>MFACodeGenerator_TemporaryKey.pfx</ManifestKeyFile>
+  </PropertyGroup>
+  <PropertyGroup>
+    <GenerateManifests>true</GenerateManifests>
+  </PropertyGroup>
+  <PropertyGroup>
+    <SignManifests>true</SignManifests>
+  </PropertyGroup>
   <ItemGroup>
+    <Reference Include="NtpClient, Version=1.0.14.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\NtpClient.1.0.14\lib\net40\NtpClient.dll</HintPath>
+    </Reference>
     <Reference Include="Otp.NET, Version=1.2.2.0, Culture=neutral, PublicKeyToken=38a48df817e173a6, processorArchitecture=MSIL">
       <HintPath>..\packages\Otp.NET.1.2.2\lib\net45\Otp.NET.dll</HintPath>
     </Reference>
@@ -70,6 +101,7 @@
       <AutoGen>True</AutoGen>
       <DependentUpon>Resources.resx</DependentUpon>
     </Compile>
+    <None Include="MFACodeGenerator_TemporaryKey.pfx" />
     <None Include="packages.config" />
     <None Include="Properties\Settings.settings">
       <Generator>SettingsSingleFileGenerator</Generator>
@@ -84,5 +116,12 @@
   <ItemGroup>
     <None Include="App.config" />
   </ItemGroup>
+  <ItemGroup>
+    <BootstrapperPackage Include="Microsoft.Net.Framework.3.5.SP1">
+      <Visible>False</Visible>
+      <ProductName>.NET Framework 3.5 SP1</ProductName>
+      <Install>false</Install>
+    </BootstrapperPackage>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>

MFACodeGenerator/Program.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using System.Windows.Forms;
+using NtpClient;
 
 namespace MFACodeGenerator
 {
@@ -14,6 +15,29 @@ namespace MFACodeGenerator
         [STAThread]
         static void Main()
         {
+            try
+            {
+                NtpClient.NtpConnection client
+                    = new NtpConnection("pool.ntp.org");
+                var NetDate = client.GetUtc();
+
+                var diff = NetDate - DateTime.UtcNow;
+
+                if (Math.Abs(diff.Seconds) >= 60)
+                {
+                    MessageBox.Show("Time difference is greater than 60 seconds. Please check your local clock settings!",
+                        "Clock Drift Detected",
+                        MessageBoxButtons.OK,
+                        MessageBoxIcon.Error);
+                    return;
+                }
+            } catch
+            {
+                MessageBox.Show("Since we can't verify your PC's clock to a reliable time source, this application may not work properly. Please ensure the time on your PC is set correctly.",
+                    "No Reliable Time Source Found"
+                    , MessageBoxButtons.OK
+                    , MessageBoxIcon.Warning);
+            }
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
             Application.Run(new Form1());

MFACodeGenerator/packages.config

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="NtpClient" version="1.0.14" targetFramework="net45" />
   <package id="Otp.NET" version="1.2.2" targetFramework="net46" />
 </packages>