Bonjour à tous,

Je travail dans une société dans lequel on va permettre au client de signer numériquement des documents or pour cela il faut vérifier les CRL.
Sur le papier l'OCSP c'est le bonheur mais sa mise en pratique est plus que folklorique .

Après moult recherche nous nous sommes tourner vers une API de Bouncy Castle.

Vu que tout les exemple trouver étais en Java, nous avons donc fait une traduction vers l'ASP mais rien à faire nous avons toujours 2 problèmes majeur (fichue machine têtue ):
- Impossible d'afficher la liste des certificats en prod (en débug ca marche nickel)
- Lorsque l'on tente de vérifier la validité d'un certificat, le statuts de retour de l'OCSP est toujours "unauthorized"

Voici le code utiliser
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;
using System.Net;
using System.Collections;
using System.Security.Cryptography.X509Certificates;
/*Bouncy castle*/
using Org.BouncyCastle.Ocsp;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto.Tls;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Ocsp;
using Org.BouncyCastle.Utilities.Encoders;
using Org.BouncyCastle.X509;
 
 
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {        X509Store store = new X509Store(StoreName.My);
        store.Open(OpenFlags.ReadOnly);
 
        X509CertificateCollection certificates =
            X509Certificate2UI.SelectFromCollection
            (
            store.Certificates,
            "Liste des certificats",
            "Veuillez sélectionner un certificat",
            X509SelectionFlag.SingleSelection
            );
        //Close certificate store
        store.Close();
        //Retrieve selected certificate
        if (certificates.Count == 0) //the user has caceled shoosing certificate
        {
            return;
        }
        X509Certificate2 certificate = (X509Certificate2)certificates[0];
        //Convert X509Certificate2 to Org.BouncyCastle.X509.X509Certificate
        X509CertificateParser certParser = new X509CertificateParser();
        Org.BouncyCastle.X509.X509Certificate CertBouncy = certParser.ReadCertificate(certificate.RawData);
        //FileStream fs = new FileStream(@"C:\AV.cer",FileMode.Open);
        //Org.BouncyCastle.X509.X509Certificate CertBouncy = certParser.ReadCertificate(fs);
        DoOcspRequest(new Uri("http://ocsp.eid.belgium.be"), CertBouncy.SerialNumber, CertBouncy);
    }
 
    private static byte[] getOcspPackage(BigInteger serialNr, Org.BouncyCastle.X509.X509Certificate cacert)
    {
        OcspReqGenerator gen = new OcspReqGenerator();
        try {
            CertificateID certId = new CertificateID(CertificateID.HashSha1, cacert, serialNr);
            gen.AddRequest(certId);
            gen.SetRequestExtensions(getExtentions());
            OcspReq req;
            req = gen.Generate();
            return req.GetEncoded();
        } catch (OcspException e) {
            System.Console.WriteLine(e.Message);
        } catch (IOException e) {
            System.Console.WriteLine(e.Message);
        }
        return null;
    }
 
    private static X509Extensions getExtentions() {
        byte[] nonce = new byte[16];
        Hashtable exts = new Hashtable();
        Org.BouncyCastle.Asn1.X509.X509Extension nonceext = new Org.BouncyCastle.Asn1.X509.X509Extension(false,new DerOctetString(nonce));
        exts.Add(OcspObjectIdentifiers.PkixOcspNonce, nonceext);
        return new X509Extensions(exts);
    }
 
    private byte[] DoOcspRequest(Uri uri, BigInteger serialNr, Org.BouncyCastle.X509.X509Certificate certificate)
    {
        byte[] response = null;
        HttpWebRequest webRequest = null;
        try
        {
            webRequest = (HttpWebRequest)WebRequest.Create(uri);
            //Setting required HTTP Headers
            webRequest.ContentType = "application/ocsp-request";
            //webRequest.Accept = "application/ocsp-response";
            webRequest.Method = "POST";
            byte[] ocspPackage = getOcspPackage(serialNr, certificate);
            webRequest.ContentLength = ocspPackage.Length;
            //webRequest.KeepAlive = true;
            Stream s = webRequest.GetRequestStream();
            s.Write(ocspPackage, 0, ocspPackage.Length);
 
            //Getting the response
            HttpWebResponse res = (HttpWebResponse)webRequest.GetResponse();
 
            //reading Content-Length Header
            long contentLength = res.ContentLength;//normally about 3100 bytes
            OcspResp OcspResponse = new OcspResp(res.GetResponseStream());
            string statusOcsp = getOcspResponseStatus(OcspResponse.Status);
            System.Console.WriteLine(statusOcsp);
 
 
            BasicOcspResp brep;
            brep = (BasicOcspResp)OcspResponse.GetResponseObject();
            SingleResp[] singleResps = brep.Responses;
            SingleResp singleResp = singleResps[0];
            Object status = singleResp.GetCertStatus();
            s.Close();
        }
        catch (Exception ex)
        {
            //exceptionhandling
        }
        return response;
    }
 
    private static string getOcspResponseStatus(int status)
    {
        string OcspResponseStatus = "";
        switch (status)
        {
            case 0: OcspResponseStatus = "succesfull";
                break;
            case 1: OcspResponseStatus = "malformedRequest";
                break;
            case 2: OcspResponseStatus = "internalError";
                break;
            case 3: OcspResponseStatus = "tryLater";
                break;
            case 5: OcspResponseStatus = "sigRequired";
                break;
            case 6: OcspResponseStatus = "unauthorized";
                break;
        }
        return OcspResponseStatus;
    }
 
    private static void getOcspResponse(Stream sResponse)
    {
        try
        {
            OcspResp response = new OcspResp(sResponse);
            BasicOcspResp brep;
            brep = (BasicOcspResp)response.GetResponseObject();
            SingleResp[] singleResps = brep.Responses;
            SingleResp singleResp = singleResps[0];
            Object status = singleResp.GetCertStatus();
 
            if (status == null)
            {
                System.Console.WriteLine("OCSP Response is GOOD");
            }
            else
            {
                System.Console.WriteLine("OCSP Response is REVOKED or UNKNOW");
            }
 
        }
        catch (Exception e)
        {
            System.Console.WriteLine(e.Message);
        }
    }
Merci d'avance pour toutes aide et/ou suggestion et bonne journée