用X509Certificate2 (JwtSecurityTokenHandler)保护JWT

Question

我设法使JwtSecurityTokenHandler与X509Certificate2一起工作。我能够用X509Certificate2对象对令牌进行签名。我还能够通过X509Certificate2.RawData属性使用证书的原始数据来验证令牌。

以下是代码：

class Program
{
    static void Main(string[] args)
    {
        X509Store store = new X509Store("My");
        store.Open(OpenFlags.ReadOnly);
        X509Certificate2 signingCert = store.Certificates[0];

        string token = CreateTokenWithX509SigningCredentials(signingCert);
        ClaimsPrincipal principal = ValidateTokenWithX509SecurityToken(
            new X509RawDataKeyIdentifierClause(signingCert.RawData), token);
    }

    static string CreateTokenWithX509SigningCredentials(X509Certificate2 signingCert)
    {
        var now = DateTime.UtcNow;
        var tokenHandler = new JwtSecurityTokenHandler();
        var tokenDescriptor = new SecurityTokenDescriptor
        {
            Subject = new ClaimsIdentity(new Claim[]
                    {
                        new Claim(ClaimTypes.Name, "Tugberk"),
                        new Claim(ClaimTypes.Role, "Sales"), 
                    }),
            TokenIssuerName = "self",
            AppliesToAddress = "http://www.example.com",
            Lifetime = new Lifetime(now, now.AddMinutes(2)),
            SigningCredentials = new X509SigningCredentials(signingCert)
        };

        SecurityToken token = tokenHandler.CreateToken(tokenDescriptor);
        string tokenString = tokenHandler.WriteToken(token);

        return tokenString;
    }

    static ClaimsPrincipal ValidateTokenWithX509SecurityToken(X509RawDataKeyIdentifierClause x509DataClause, string token)
    {
        var tokenHandler = new JwtSecurityTokenHandler();
        var x509SecurityToken = new X509SecurityToken(new X509Certificate2(x509DataClause.GetX509RawData()));
        var validationParameters = new TokenValidationParameters()
        {
            AllowedAudience = "http://www.example.com",
            SigningToken = x509SecurityToken,
            ValidIssuer = "self",
        };

        ClaimsPrincipal claimsPrincipal = tokenHandler.ValidateToken(
            new JwtSecurityToken(token), validationParameters);

        return claimsPrincipal;
    }
}

我的主要问题是，我应该从我的X509Certificate2向世界暴露什么。我应该揭示X509Certificate2的哪一部分，以便使用者应该验证JWT令牌，但是不能使用相同的证书创建新的令牌。

Answer 1

您必须公开公钥，您可以通过右键单击证书并在MMC上进行导出(不包括私钥)。那么，无论谁必须验证令牌，都会执行以下操作：

 var x509 = new X509Certificate2(pathToExportedCert);

也可以使用字节数组ctor，并将公钥编码为base64。