Register certificate to SSL port
I have a windows service (running as LocalSystem) that is self-hosting an OWIN service (SignalR) and needs to be accessed over SSL.
I can set up the SSL binding on my local development machine just fine - and I can access my service over SSL on that same machine. However, when I go to another machine and try to run the following command I receive an error:
Command:
netsh http add sslcert ipport=0.0.0.0:9389 appid={...guid here...} certhash=...cert hash here...
Error:
SSL Certificate add failed, Error: 1312
A specified logon session does not exist. It may have already been terminated.
The certificate I am using is a fully signed cert (not a development cert) and works on my local dev box. Here's what I am doing:
Windows service starts up and registers my certificate using the following code:
var store = new X509Store(StoreName.Root, StoreLocation.LocalMachine);
store.Open(OpenFlags.ReadWrite);
var path = AppDomain.CurrentDomain.BaseDirectory;
var cert = new X509Certificate2(path + @"mycert.cer");
var existingCert = store.Certificates.Find(X509FindType.FindByThumbprint, cert.Thumbprint, false);
if (existingCert.Count == 0)
store.Add(cert);
store.Close();
I then attempt to bind the certificate to port 9389 using netsh and the following code:
var process = new Process {
StartInfo = new ProcessStartInfo {
WindowStyle = ProcessWindowStyle.Hidden,
FileName = "cmd.exe",
Arguments = "/c netsh http add sslcert ipport=0.0.0.0:9389 appid={12345678-db90-4b66-8b01-88f7af2e36bf} certhash=" + cert.thumbprint
}
};
process.Start();
The code above successfully installs the certificate to the "Local Machine - CertificatesTrusted Root Certification AuthoritiesCertificates" certificate folder - but the netsh command fails to run with the error I described above. If I take the netsh command and run it in a command prompt as an administrator on that box it also throws out the same error - so I don't believe that it's a code related issue...
I have to imagine that this is possible to accomplish - plenty of other applications create self-hosted services and host them over ssl - but I cannot seem to get this to work at all...anyone have any suggestions? Perhaps programmatic alternatives to netsh?
Okay I found the answer:
If you are bringing in a certificate from another machine it will NOT work on the new machine. You have to create a self-signed certificate on the new machine and import it into the Local Computer's Trusted Root Certificates.
The answer is from here: How to create a self-signed certificate using C#?
For posterity's sake this is the process used to create a self signed cert (from the above referenced answer):
Import the CertEnroll 1.0 Type Library from the COM tab in your project's references
Add the following method to your code:
//This method credit belongs to this StackOverflow Answer:
//https://stackoverflow.com/a/13806300/594354
using CERTENROLLLib;
public static X509Certificate2 CreateSelfSignedCertificate(string subjectName)
{
// create DN for subject and issuer
var dn = new CX500DistinguishedName();
dn.Encode("CN=" + subjectName, X500NameFlags.XCN_CERT_NAME_STR_NONE);
// create a new private key for the certificate
CX509PrivateKey privateKey = new CX509PrivateKey();
privateKey.ProviderName = "Microsoft Base Cryptographic Provider v1.0";
privateKey.MachineContext = true;
privateKey.Length = 2048;
privateKey.KeySpec = X509KeySpec.XCN_AT_SIGNATURE; // use is not limited
privateKey.ExportPolicy = X509PrivateKeyExportFlags.XCN_NCRYPT_ALLOW_PLAINTEXT_EXPORT_FLAG;
privateKey.Create();
// Use the stronger SHA512 hashing algorithm
var hashobj = new CObjectId();
hashobj.InitializeFromAlgorithmName(ObjectIdGroupId.XCN_CRYPT_HASH_ALG_OID_GROUP_ID,
ObjectIdPublicKeyFlags.XCN_CRYPT_OID_INFO_PUBKEY_ANY,
AlgorithmFlags.AlgorithmFlagsNone, "SHA512");
// add extended key usage if you want - look at MSDN for a list of possible OIDs
var oid = new CObjectId();
oid.InitializeFromValue("1.3.6.1.5.5.7.3.1"); // SSL server
var oidlist = new CObjectIds();
oidlist.Add(oid);
var eku = new CX509ExtensionEnhancedKeyUsage();
eku.InitializeEncode(oidlist);
// Create the self signing request
var cert = new CX509CertificateRequestCertificate();
cert.InitializeFromPrivateKey(X509CertificateEnrollmentContext.ContextMachine, privateKey, "");
cert.Subject = dn;
cert.Issuer = dn; // the issuer and the subject are the same
cert.NotBefore = DateTime.Now;
// this cert expires immediately. Change to whatever makes sense for you
cert.NotAfter = DateTime.Now;
cert.X509Extensions.Add((CX509Extension)eku); // add the EKU
cert.HashAlgorithm = hashobj; // Specify the hashing algorithm
cert.Encode(); // encode the certificate
// Do the final enrollment process
var enroll = new CX509Enrollment();
enroll.InitializeFromRequest(cert); // load the certificate
enroll.CertificateFriendlyName = subjectName; // Optional: add a friendly name
string csr = enroll.CreateRequest(); // Output the request in base64
// and install it back as the response
enroll.InstallResponse(InstallResponseRestrictionFlags.AllowUntrustedCertificate,
csr, EncodingType.XCN_CRYPT_STRING_BASE64, ""); // no password
// output a base64 encoded PKCS#12 so we can import it back to the .Net security classes
var base64encoded = enroll.CreatePFX("", // no password, this is for internal consumption
PFXExportOptions.PFXExportChainWithRoot);
// instantiate the target class with the PKCS#12 data (and the empty password)
return new System.Security.Cryptography.X509Certificates.X509Certificate2(
System.Convert.FromBase64String(base64encoded), "",
// mark the private key as exportable (this is usually what you want to do)
System.Security.Cryptography.X509Certificates.X509KeyStorageFlags.Exportable
);
}
For anyone else reading this answer - the code for importing the certificate from the original question should now change to the following:
var certName = "Your Cert Subject Name";
var store = new X509Store(StoreName.Root, StoreLocation.LocalMachine);
store.Open(OpenFlags.ReadWrite);
var existingCert = store.Certificates.Find(X509FindType.FindBySubjectName, certName, false);
if (existingCert.Count == 0)
{
var cert = CreateSelfSignedCertificate(certName);
store.Add(cert);
RegisterCertForSSL(cert.Thumbprint);
}
store.Close();
Here is the full code including:
** Forgive me the quality of code. It's just a very dirty proof of concept glued form different pieces of code I found on the web and Robert Petz answer. I didn't have time to clean it up:
Remember to
Code:
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;
using System.Web.Http.SelfHost;
using CERTENROLLLib;
namespace SelfhostSSLProofOfConcept
{
/// <summary>
/// Add Reference: COM > TypeLibraries > CertEnroll 1.0 Type Library
/// </summary>
class Program
{
static void Main(string[] args)
{
var port = 1234;
var certSubjectName = "Your cert subject name";
var expiresIn = TimeSpan.FromDays(7);
var cert = GenerateCert(certSubjectName, expiresIn);
Console.WriteLine("Generated certificate, {0}Thumbprint: {1}{0}", Environment.NewLine, cert.Thumbprint);
RegisterSslOnPort(port, cert.Thumbprint);
Console.WriteLine($"Registerd SSL on port: {port}");
var config = new HttpSelfHostConfiguration($"https://localhost:{port}");
var server = new HttpSelfHostServer(config, new MyWebAPIMessageHandler());
var task = server.OpenAsync();
task.Wait();
Process.Start($"https://localhost:{port}"); // automatically run browser
Console.WriteLine($"Web API Server has started at https://localhost:{port}");
Console.ReadLine();
}
private static void RegisterSslOnPort(int port, string certThumbprint)
{
var appId = Guid.NewGuid();
string arguments = $"http add sslcert ipport=0.0.0.0:{port} certhash={certThumbprint} appid={{{appId}}}";
ProcessStartInfo procStartInfo = new ProcessStartInfo("netsh", arguments);
procStartInfo.RedirectStandardOutput = true;
procStartInfo.UseShellExecute = false;
procStartInfo.CreateNoWindow = true;
var process = Process.Start(procStartInfo);
while (!process.StandardOutput.EndOfStream)
{
string line = process.StandardOutput.ReadLine();
Console.WriteLine(line);
}
process.WaitForExit();
}
public static X509Certificate2 GenerateCert(string certName, TimeSpan expiresIn)
{
var store = new X509Store(StoreName.Root, StoreLocation.LocalMachine);
store.Open(OpenFlags.ReadWrite);
var existingCert = store.Certificates.Find(X509FindType.FindBySubjectName, certName, false);
if (existingCert.Count > 0)
{
store.Close();
return existingCert[0];
}
else
{
var cert = CreateSelfSignedCertificate(certName, expiresIn);
store.Add(cert);
store.Close();
return cert;
}
}
/// <summary>
/// Add Reference: COM > TypeLibraries > CertEnroll 1.0 Type Library
/// source: https://stackoverflow.com/a/13806300/594354
/// </summary>
/// <param name="subjectName"></param>
/// <returns></returns>
public static X509Certificate2 CreateSelfSignedCertificate(string subjectName, TimeSpan expiresIn)
{
// create DN for subject and issuer
var dn = new CX500DistinguishedName();
dn.Encode("CN=" + subjectName, X500NameFlags.XCN_CERT_NAME_STR_NONE);
// create a new private key for the certificate
CX509PrivateKey privateKey = new CX509PrivateKey();
privateKey.ProviderName = "Microsoft Base Cryptographic Provider v1.0";
privateKey.MachineContext = true;
privateKey.Length = 2048;
privateKey.KeySpec = X509KeySpec.XCN_AT_SIGNATURE; // use is not limited
privateKey.ExportPolicy = X509PrivateKeyExportFlags.XCN_NCRYPT_ALLOW_PLAINTEXT_EXPORT_FLAG;
privateKey.Create();
// Use the stronger SHA512 hashing algorithm
var hashobj = new CObjectId();
hashobj.InitializeFromAlgorithmName(ObjectIdGroupId.XCN_CRYPT_HASH_ALG_OID_GROUP_ID,
ObjectIdPublicKeyFlags.XCN_CRYPT_OID_INFO_PUBKEY_ANY,
AlgorithmFlags.AlgorithmFlagsNone, "SHA512");
// add extended key usage if you want - look at MSDN for a list of possible OIDs
var oid = new CObjectId();
oid.InitializeFromValue("1.3.6.1.5.5.7.3.1"); // SSL server
var oidlist = new CObjectIds();
oidlist.Add(oid);
var eku = new CX509ExtensionEnhancedKeyUsage();
eku.InitializeEncode(oidlist);
// Create the self signing request
var cert = new CX509CertificateRequestCertificate();
cert.InitializeFromPrivateKey(X509CertificateEnrollmentContext.ContextMachine, privateKey, "");
cert.Subject = dn;
cert.Issuer = dn; // the issuer and the subject are the same
cert.NotBefore = DateTime.Now;
// this cert expires immediately. Change to whatever makes sense for you
cert.NotAfter = DateTime.Now.Add(expiresIn);
cert.X509Extensions.Add((CX509Extension)eku); // add the EKU
cert.HashAlgorithm = hashobj; // Specify the hashing algorithm
cert.Encode(); // encode the certificate
// Do the final enrollment process
var enroll = new CX509Enrollment();
enroll.InitializeFromRequest(cert); // load the certificate
enroll.CertificateFriendlyName = subjectName; // Optional: add a friendly name
string csr = enroll.CreateRequest(); // Output the request in base64
// and install it back as the response
enroll.InstallResponse(InstallResponseRestrictionFlags.AllowUntrustedCertificate,
csr, EncodingType.XCN_CRYPT_STRING_BASE64, ""); // no password
// output a base64 encoded PKCS#12 so we can import it back to the .Net security classes
var base64encoded = enroll.CreatePFX("", // no password, this is for internal consumption
PFXExportOptions.PFXExportChainWithRoot);
// instantiate the target class with the PKCS#12 data (and the empty password)
return new System.Security.Cryptography.X509Certificates.X509Certificate2(
System.Convert.FromBase64String(base64encoded), "",
// mark the private key as exportable (this is usually what you want to do)
System.Security.Cryptography.X509Certificates.X509KeyStorageFlags.Exportable
);
}
}
class MyWebAPIMessageHandler : HttpMessageHandler
{
protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
{
var task = new Task<HttpResponseMessage>(() => {
var resMsg = new HttpResponseMessage();
resMsg.Content = new StringContent("Hello World!");
return resMsg;
});
task.Start();
return task;
}
}
}
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