如何验证JWT令牌 [英] How to validate a JWT token

问题描述

我正在尝试使用JWT令牌.我设法生成了一个有效的JWTTokenString并在 JWT调试器上进行了验证，但是我无法验证.Net中的令牌.这是我到目前为止的代码:

I'm trying to use JWT tokens. I managed to generate a valid JWTTokenString and validated it on the JWT debugger but I'm having an impossible time validating the token in .Net. Here's the code I have so far:

class Program {

    static string key = "401b09eab3c013d4ca54922bb802bec8fd5318192b0a75f201d8b3727429090fb337591abd3e44453b954555b7a0812e1081c39b740293f765eae731f5a65ed1";

    static void Main(string[] args) {
        var stringToken = GenerateToken();
        ValidateToken(stringToken);
    }

    private static string GenerateToken() {
        var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key));

        var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);

        var header = new JwtHeader(credentials);

        var payload = new JwtPayload {
           { "some ", "hello "},
           { "scope", "world"},
        };

        var secToken = new JwtSecurityToken(header, payload);
        var handler = new JwtSecurityTokenHandler();

        return handler.WriteToken(secToken);

    }

    private static bool ValidateToken(string authToken) {
        var tokenHandler = new JwtSecurityTokenHandler();
        var validationParameters = GetValidationParameters();

        SecurityToken validatedToken;
        IPrincipal principal = tokenHandler.ValidateToken(authToken, validationParameters, out validatedToken);
        Thread.CurrentPrincipal = principal;
        return true;
    }

    private static TokenValidationParameters GetValidationParameters() {
        return new TokenValidationParameters() {
            //NOT A CLUE WHAT TO PLACE HERE
        };
    }
}

我想要的是一个接收令牌并根据其有效性返回true或false的函数.从研究中我已经看到人们使用IssuerSigningToken分配验证密钥.但是当我尝试使用它时，它似乎并不存在.有人可以帮我验证令牌吗?

All I want is a function that receives a token and returns true or false based on its validity. From research I've seen people use IssuerSigningToken to assign the validation key. But when I try to use it, it doesn't seem to exist. Could anyone give me a hand on validating the token?

推荐答案

您必须使用与用于生成令牌的密钥相同的密钥来验证令牌.另外，您还需要禁用一些验证，例如到期，发行者和审计，因为您生成的令牌没有这些信息(或者您可以添加这些信息).这是一个工作示例:

You must use the same key to validate the token as the one you use to generate it. Also you need to disable some validations such as expiration, issuer and audiance, because the token you generate doesn't have these information (or you can add these information). Here's a working example:

class Program
{
    static string key = "401b09eab3c013d4ca54922bb802bec8fd5318192b0a75f201d8b3727429090fb337591abd3e44453b954555b7a0812e1081c39b740293f765eae731f5a65ed1";

    static void Main(string[] args)
    {
        var stringToken = GenerateToken();
        ValidateToken(stringToken);
    }

    private static string GenerateToken()
    {
        var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key));
        var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);

        var secToken = new JwtSecurityToken(
            signingCredentials: credentials,
            issuer: "Sample",
            audience: "Sample",
            claims: new[]
            {
                new Claim(JwtRegisteredClaimNames.Sub, "meziantou")
            },
            expires: DateTime.UtcNow.AddDays(1));

        var handler = new JwtSecurityTokenHandler();
        return handler.WriteToken(secToken);
    }

    private static bool ValidateToken(string authToken)
    {
        var tokenHandler = new JwtSecurityTokenHandler();
        var validationParameters = GetValidationParameters();

        SecurityToken validatedToken;
        IPrincipal principal = tokenHandler.ValidateToken(authToken, validationParameters, out validatedToken);
        return true;
    }

    private static TokenValidationParameters GetValidationParameters()
    {
        return new TokenValidationParameters()
        {
            ValidateLifetime = false, // Because there is no expiration in the generated token
            ValidateAudience = false, // Because there is no audiance in the generated token
            ValidateIssuer = false,   // Because there is no issuer in the generated token
            ValidIssuer = "Sample",
            ValidAudience = "Sample",
            IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key)) // The same key as the one that generate the token
        };
    }
}

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