c# - ASP.NET 中的 JWT token 验证

Question

我正在 ASP.NET 中编写一个 API，它公开两个端点:一个用于生成 JWT token ，另一个用于验证给定的 token 。

token 生成似乎工作正常:

 [HttpPost]
        public IHttpActionResult Token()
        {
            var headerAuth = HttpContext.Current.Request.Headers["Authorization"];
            if (headerAuth.ToString().StartsWith("Basic"))
            {
                var credValue = headerAuth.ToString().Substring("Basic".Length).Trim();
                var usernameAndPassEnc = Encoding.UTF8.GetString(Convert.FromBase64String(credValue));
                var usernameAndPass = usernameAndPassEnc.Split(':');

                LdapAuthentication ldap = new LdapAuthentication();

                if (ldap.IsAuthenticated(usernameAndPass[0], usernameAndPass[1]))
                {
                    var claimsData = new[] { new Claim(ClaimTypes.Name, usernameAndPass[0]) };
                    var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("secret"));
                    var signInCred = new SigningCredentials(key, SecurityAlgorithms.HmacSha256Signature, SecurityAlgorithms.Sha256Digest);
                    var tokenString = new JwtSecurityToken(
                        issuer: "http://my.website.com",
                        audience: "http://my.tokenissuer.com",
                        expires: DateTime.Now.AddMinutes(1),
                        claims: claimsData,
                        signingCredentials: signInCred
                        );

                    var token = new JwtSecurityTokenHandler().WriteToken(tokenString);
                    return Ok(token);
                }
            }

            return BadRequest("Bad request");
        }  

但我不知道如何验证给定的 token ，在 ASP.NET Core 中我在这个 whay 中实现它(效果很好):

public void ConfigureServices(IServiceCollection services)
        {
            services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme).AddJwtBearer(options =>
            {
                options.TokenValidationParameters = new TokenValidationParameters
                {
                    ValidateIssuer = true,
                    ValidateAudience = true,
                    ValidateIssuerSigningKey = true,
                    ValidIssuer = "http://my.website.com",
                    ValidAudience = "http://my.tokenissuer.com",
                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("secret"))
                };
            });
            services.AddMvc();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseAuthentication();
            app.UseMvc();
        }

那么，如何在 ASP.NET 中验证 JWT token ？

Answer 1

为此，您可以编写中间件或使用现有的授权过滤器并覆盖它。使用以下方式验证token

    public static bool ValidateToken(string authToken) // Retrieve token from request header
    {
        var tokenHandler = new JwtSecurityTokenHandler();
        var validationParameters = this.GetValidationParameters();

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

    private static TokenValidationParameters GetValidationParameters()
    {
        return new TokenValidationParameters
        {
            IssuerSigningToken = new System.ServiceModel.Security.Tokens.BinarySecretSecurityToken(symmetricKey), //Key used for token generation
            ValidIssuer = issuerName,
            ValidAudience = allowedAudience,
            ValidateIssuerSigningKey = true,
            ValidateIssuer = true,
            ValidateAudience = true
        };
    }