Question

我试图在JWT项目中使用ASP.NET Core Web API进行身份验证机制。假设此项目没有MVC部分，并且不使用cookie身份验证。我已根据this guide创建了我的代码。

登录效果很好，[Authorize]属性保护功能正常但User.Identity.Name为null。我该如何解决这个问题？

我的代码：

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    var jwtAppSettingOptions = Configuration.GetSection(nameof(JwtIssuerOptions));
    var tokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuer = true,
        ValidIssuer = jwtAppSettingOptions[nameof(JwtIssuerOptions.Issuer)],

        ValidateAudience = true,
        ValidAudience = jwtAppSettingOptions[nameof(JwtIssuerOptions.Audience)],

        ValidateIssuerSigningKey = true,
        IssuerSigningKey = _signingKey,

        RequireExpirationTime = true,
        ValidateLifetime = true,

        ClockSkew = TimeSpan.Zero
    };

    app.UseJwtBearerAuthentication(new JwtBearerOptions
    {
        AutomaticAuthenticate = true,
        AutomaticChallenge = true,
        TokenValidationParameters = tokenValidationParameters,
        AuthenticationScheme = JwtBearerDefaults.AuthenticationScheme
    });

    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Index}/{id?}");
    });
}

    [HttpPost]
    [AllowAnonymous]
    [Route("Login")]
    public async Task<IActionResult> Login([FromForm] ApplicationUser applicationUser)
    {
        //assume user/pass are checked and are ok

        _logger.LogInformation(1, "API User logged in.");
        var user = await _userManager.FindByNameAsync(applicationUser.UserName);
        var roles = await _userManager.GetRolesAsync(user);

        var claims = new List<Claim>
        {
            new Claim(JwtRegisteredClaimNames.Sub, applicationUser.UserName),
            new Claim(ClaimTypes.NameIdentifier, applicationUser.UserName),
            new Claim(JwtRegisteredClaimNames.Jti, await _jwtOptions.JtiGenerator()),
            new Claim(JwtRegisteredClaimNames.Iat,
                    ToUnixEpochDate(_jwtOptions.IssuedAt).ToString(),
                    ClaimValueTypes.Integer64),
                    new Claim("Claim", "Value")
        };

        if (roles != null)
            foreach (var role in roles)
                claims.Add(new Claim("role", role));

        // Create the JWT security token and encode it.
        var jwt = new JwtSecurityToken(
            issuer: _jwtOptions.Issuer,
            audience: _jwtOptions.Audience,
            claims: claims,
            notBefore: _jwtOptions.NotBefore,
            expires: _jwtOptions.Expiration,
            signingCredentials: _jwtOptions.SigningCredentials);

        var encodedJwt = new JwtSecurityTokenHandler().WriteToken(jwt);

        // Serialize and return the response
        var response = new
        {
            access_token = encodedJwt,
            expires_in = (int)_jwtOptions.ValidFor.TotalSeconds
        };

        var json = JsonConvert.SerializeObject(response, _serializerSettings);
        return new OkObjectResult(json);
    }

Answer 1

在您的声明中（第二个代码段）我只能看到这个：

new Claim(ClaimTypes.NameIdentifier, applicationUser.UserName),

但你需要添加：

new Claim(ClaimTypes.Name, applicationUser.UserName),

然后User.Identity.Name应包含用户名。

Answer 2

另一种选择是在JwtRegisteredClaimNames.Sub中设置tokenValidationParameters的命名空间。这将让您继续使用标准：

var tokenValidationParameters = new TokenValidationParameters
{
    // Ensure that User.Identity.Name is set correctly after login
    NameClaimType = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier",

    ... existing code ...
}

更新：Diogo Barros在我的博客上留下了关于此主题的评论：

＆＃34;你好，

感谢您的帮助。这对我有用。为了更加一致和安全，您可以使用ClaimTypes.NameIdentifier（在System.Security.Claims命名空间中），而不是硬编码字符串。＆＃34;

我已经将代码更改为使用内置的ClaimTypes枚举，因为它比使用命名空间字符串更优雅。

UseJwtBearerAuthentication不会填充User.Identity.Name

2 个答案: