SSLInspector

SSLInspector.cs

namespace SSLInspector
{
    using System;
    using System.Net.Http;
    using System.Security.Cryptography.X509Certificates;
    using System.Threading.Tasks;

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Url to query (https://nuget.org is default)");
            var url = Console.ReadLine();
            if (url == string.Empty) url = "https://www.nuget.org";

            new Program().Run(url).Wait();
            Console.ReadLine();
        }

        async Task Run(string url)
        {
            HttpClientHandler httpClientHandler = new HttpClientHandler();
            httpClientHandler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) =>
            {
                chain.Build(cert);
                
                foreach (var item in chain.ChainElements)
                {                    
                    Console.WriteLine(item.Certificate.PrintCert());
                    Console.WriteLine();
                }

                Console.WriteLine("Errors: " + errors);

                return true;              
            };

            HttpClient http = new HttpClient(httpClientHandler);

            var x = await http.GetAsync(url);
            Console.WriteLine(x.StatusCode);
        }        
    }

    public static class CertExtensions
    {
        public static string PrintCert(this X509Certificate2 cert)
        {
            return $"{cert.SubjectName.Name} ({cert.GetSerialNumberString()}) by {cert.IssuerName.Name}";
        }
    }
}