我遇到了一个非常奇怪的问题，它简直让我发疯，而且对我来说没有任何意义。
让我解释一下: 我有一个 .NET Core 2.0 Web API，由 Angular 5 客户端使用。 Web API 托管在 Azure AppService 中。使用 AspnetCore.Authentication.JWTBearer 通过 JWT Bearer token 进行身份验证(当前版本为 2.0.1) 应用程序在身份验证/登录端点中创建 JWT token 。然后客户端就可以在接下来的调用中进行身份验证。
但是，即使我指定 token 的时间跨度为 1080 分钟(一周)，但在大约 8 小时后，我们会说 token 不再有效。我可以离开这个，(实际上我开始指定 token 在几个小时内有效)但是一旦 token 过期......这就是奇怪的东西出现的地方，应用程序在用户之后发出一个新 token 再次登录，但是新的token没有认证，说token已经过期了!刚刚创建的怎么会过期呢。 (我进行了双重检查，新收到的 token 正在发送到服务器，而不是旧的 token )。
此外，如果我只是在 Azure 中重新启动应用程序服务，那么一切都会再次恢复正常，并且会接受新发行的 jwt token 。我认为这可能是 Azure 服务器和其他服务器之间的时钟问题，因此我删除了 ClockSkew 属性并将其保留为 5 分钟(这是其默认值)，但没有成功。
我不知道是什么导致了这种奇怪的行为，但导致我的应用程序在一天中的某个时刻毫无用处，除非我进入 Azure 并重新启动应用程序服务。
我的代码如下，但我开始认为它可能是与 .net core 和 Azure 相关的错误？
你看出什么问题了吗？ 感谢您的帮助!
这是我的startup.cs类
public class Startup
{
private string connectionString;
private const string SecretKey = "iNivDmHLpUA223sqsfhqGbMRdRj1PVkH";
// todo: get this from somewhere secure
private readonly SymmetricSecurityKey _signingKey = new
SymmetricSecurityKey(Encoding.ASCII.GetBytes(SecretKey));
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
connectionString = Configuration.GetSection("ConnectionString:Value").Value;
Console.WriteLine("Connection String: " + connectionString);
services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(connectionString));
//Initialize the UserManager instance and configuration
services.AddIdentity<AppUser, IdentityRole>()
.AddEntityFrameworkStores<ApplicationDbContext>()
.AddDefaultTokenProviders();
services.TryAddTransient<IHttpContextAccessor, HttpContextAccessor>();
// add identity
var builder = services.AddIdentityCore<AppUser>(o =>
{
// configure identity options
o.Password.RequireDigit = true;
o.Password.RequireLowercase = true;
o.Password.RequireUppercase = true;
o.Password.RequireNonAlphanumeric = true;
o.Password.RequiredLength = 6;
});
builder = new IdentityBuilder(builder.UserType, typeof(IdentityRole), builder.Services);
builder.AddEntityFrameworkStores<ApplicationDbContext>().AddDefaultTokenProviders();
//START JWT CONFIGURATION
services.AddSingleton<IJwtFactory, JwtFactory>();
// Get options from app settings
var jwtAppSettingOptions = Configuration.GetSection(nameof(JwtIssuerOptions));
// Configure JwtIssuerOptions
services.Configure<JwtIssuerOptions>(options =>
{
options.Issuer = jwtAppSettingOptions[nameof(JwtIssuerOptions.Issuer)];
options.Audience = jwtAppSettingOptions[nameof(JwtIssuerOptions.Audience)];
options.SigningCredentials = new SigningCredentials(_signingKey, SecurityAlgorithms.HmacSha256);
});
var tokenValidationParameters = new TokenValidationParameters
{
ValidateIssuer = true,
ValidIssuer = jwtAppSettingOptions[nameof(JwtIssuerOptions.Issuer)],
ValidateIssuerSigningKey = true,
IssuerSigningKey = _signingKey,
ValidateAudience = true,
ValidAudience = jwtAppSettingOptions[nameof(JwtIssuerOptions.Audience)],
RequireExpirationTime = false,
// ValidateLifetime = true,
// ClockSkew = TimeSpan.Zero //default son 5 minutos
};
services.AddAuthentication(options =>
{
options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
}).AddJwtBearer(configureOptions =>
{
configureOptions.ClaimsIssuer = jwtAppSettingOptions[nameof(JwtIssuerOptions.Issuer)];
configureOptions.TokenValidationParameters = tokenValidationParameters;
configureOptions.SaveToken = true;
});
// api user claim policy
// Enables [Authorize] decorator on controllers.
//more information here: https://learn.microsoft.com/en-us/aspnet/core/security/authorization/policies?view=aspnetcore-2.1
services.AddAuthorization(options =>
{
options.AddPolicy("ApiUser", policy => policy.RequireClaim(Constants.Strings.JwtClaimIdentifiers.Rol, Constants.Strings.JwtClaims.ApiAccess));
});
//END JWT CONFIGURATION
// Register the Swagger generator, defining one or more Swagger documents
services.AddSwaggerGen(c =>
{
c.SwaggerDoc("v1", new Info
{
Title = Configuration.GetSection("Swagger:Title").Value,
Version = "v1"
});
});
//Initialize auto mapper
services.AddAutoMapper();
services.AddCors();
//Initialize MVC
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,
UserManager<AppUser> userManager, RoleManager<IdentityRole> roleManager)
{
var cultureInfo = new CultureInfo("es-AR");
//cultureInfo.NumberFormat.CurrencySymbol = "€";
CultureInfo.DefaultThreadCurrentCulture = cultureInfo;
CultureInfo.DefaultThreadCurrentUICulture = cultureInfo;
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseExceptionHandler(
builder =>
{
builder.Run(
async context =>
{
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
context.Response.Headers.Add("Access-Control-Allow-Origin", "*");
var error = context.Features.Get<IExceptionHandlerFeature>();
if (error != null)
{
context.Response.AddApplicationError(error.Error.Message);
await context.Response.WriteAsync(error.Error.Message).ConfigureAwait(false);
}
});
});
// Enable middleware to serve generated Swagger as a JSON endpoint.
app.UseSwagger();
// Enable middleware to serve swagger-ui (HTML, JS, CSS, etc.), specifying the Swagger JSON endpoint.
app.UseSwaggerUI(c =>
{
c.SwaggerEndpoint(
Configuration.GetSection("Swagger:Endpoint").Value,
Configuration.GetSection("Swagger:Title").Value);
});
app.UseAuthentication();
//Loads initial users and roles.
if (Configuration["seed"] == "true")
{
Console.WriteLine("Seeding database with connection string: " + connectionString);
Console.WriteLine();
IdentityDataInitializer.SeedData(userManager, roleManager);
Console.WriteLine("Finished seeding");
}
else
{
Console.WriteLine("seeding not configured");
}
app.UseDefaultFiles();
app.UseStaticFiles();
// Shows UseCors with CorsPolicyBuilder.
app.UseCors(builder =>
builder.WithOrigins(Configuration.GetSection("AllowedOrigins:Origin1").Value,
Configuration.GetSection("AllowedOrigins:Origin2").Value)
.AllowAnyHeader()
.AllowAnyMethod() //Permite también PREFLIGHTS / OPTIONS REQUEST!
);
Console.WriteLine("Allowed origin: " + Configuration.GetSection("AllowedOrigins:Origin1").Value);
Console.WriteLine("Allowed origin: " + Configuration.GetSection("AllowedOrigins:Origin2").Value);
app.UseMvc();
}
}
这是我的 JwtIssuerOptions.cs
public class JwtIssuerOptions
{
/// <summary>
/// 4.1.1. "iss" (Issuer) Claim - The "iss" (issuer) claim identifies the principal that issued the JWT.
/// </summary>
public string Issuer { get; set; }
/// <summary>
/// 4.1.2. "sub" (Subject) Claim - The "sub" (subject) claim identifies the principal that is the subject of the JWT.
/// </summary>
public string Subject { get; set; }
/// <summary>
/// 4.1.3. "aud" (Audience) Claim - The "aud" (audience) claim identifies the recipients that the JWT is intended for.
/// </summary>
public string Audience { get; set; }
/// <summary>
/// 4.1.4. "exp" (Expiration Time) Claim - The "exp" (expiration time) claim identifies the expiration time on or after which the JWT MUST NOT be accepted for processing.
/// </summary>
public DateTime Expiration => IssuedAt.Add(ValidFor);
/// <summary>
/// 4.1.5. "nbf" (Not Before) Claim - The "nbf" (not before) claim identifies the time before which the JWT MUST NOT be accepted for processing.
/// </summary>
public DateTime NotBefore { get; set; } = DateTime.UtcNow;
/// <summary>
/// 4.1.6. "iat" (Issued At) Claim - The "iat" (issued at) claim identifies the time at which the JWT was issued.
/// </summary>
public DateTime IssuedAt { get; set; } = DateTime.UtcNow;
/// <summary>
/// Set the timespan the token will be valid for (default is 120 min)
/// </summary>
public TimeSpan ValidFor { get; set; } = TimeSpan.FromMinutes(1080);//una semana
/// <summary>
/// "jti" (JWT ID) Claim (default ID is a GUID)
/// </summary>
public Func<Task<string>> JtiGenerator =>
() => Task.FromResult(Guid.NewGuid().ToString());
/// <summary>
/// The signing key to use when generating tokens.
/// </summary>
public SigningCredentials SigningCredentials { get; set; }
}
Token.cs 类，将带有 token 的 json 发送到客户端
public class Tokens
{
public static async Task<object> GenerateJwt(ClaimsIdentity identity, IJwtFactory jwtFactory, string userName, JwtIssuerOptions jwtOptions, JsonSerializerSettings serializerSettings)
{
var response = new
{
id = identity.Claims.Single(c => c.Type == "id").Value,
auth_token = await jwtFactory.GenerateEncodedToken(userName, identity),
expires_in = (int)jwtOptions.ValidFor.TotalSeconds
};
return response;
//return JsonConvert.SerializeObject(response, serializerSettings);
}
}
AuthController.cs
[Produces("application/json")]
[Route("api/[controller]")]
public class AuthController : Controller
{
private readonly UserManager<AppUser> _userManager;
private readonly IJwtFactory _jwtFactory;
private readonly JwtIssuerOptions _jwtOptions;
private readonly ILogger _logger;
public AuthController(UserManager<AppUser> userManager,
IJwtFactory jwtFactory,
IOptions<JwtIssuerOptions> jwtOptions,
ILogger<AuthController> logger)
{
_userManager = userManager;
_jwtFactory = jwtFactory;
_jwtOptions = jwtOptions.Value;
_logger = logger;
}
// POST api/auth/login
[HttpPost("login")]
public async Task<IActionResult> Post([FromBody]CredentialsViewModel credentials)
{
try
{
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
var identity = await GetClaimsIdentity(credentials.UserName, credentials.Password);
if (identity == null)
{
// Credentials are invalid, or account doesn't exist
_logger.LogInformation(LoggingEvents.InvalidCredentials, "Invalid Credentials");
return BadRequest(Errors.AddErrorToModelState("login_failure", "Invalid username or password.", ModelState));
}
var jwt = await Tokens.GenerateJwt(identity, _jwtFactory, credentials.UserName, _jwtOptions, new JsonSerializerSettings { Formatting = Formatting.Indented });
CurrentUser cu = Utils.GetCurrentUserInformation(identity.Claims.Single(c => c.Type == "id").Value, _userManager).Result;
if (cu != null)
{
cu.Jwt = jwt;
return new OkObjectResult(cu);
}
return StatusCode(500);
}
catch (System.Exception ex)
{
_logger.LogError(LoggingEvents.GenericError, ex.Message);
return StatusCode(500, ex);
}
}
private async Task<ClaimsIdentity> GetClaimsIdentity(string userName, string password)
{
try
{
if (string.IsNullOrEmpty(userName) || string.IsNullOrEmpty(password))
return await Task.FromResult<ClaimsIdentity>(null);
// get the user to verifty
ILogicUsers lusers = Business.UsersLogic(_userManager);
AppUser userToVerify = await lusers.FindByNameAsync(userName);
if (userToVerify == null)
return await Task.FromResult<ClaimsIdentity>(null);
// check the credentials
if (await lusers.CheckPasswordAsync(userToVerify, password))
{
return await Task.FromResult(_jwtFactory.GenerateClaimsIdentity(userName, userToVerify.Id));
}
// Credentials are invalid, or account doesn't exist
_logger.LogInformation(LoggingEvents.InvalidCredentials, "Invalid Credentials");
return await Task.FromResult<ClaimsIdentity>(null);
}
catch
{
throw;
}
}
}
最佳答案
好吧，我想我已经解决了这个问题。
IssuedAt 属性是静态的，并且采用第一次生成的 token 值。当 token 过期时，会生成一个新的 token ，但会采用第一个 token 的 IssuedAt 日期，这就是所有新生成的 token 都过期的原因。在 Azure 中重新启动 AppService 会导致静态值被清除，并正确创建第一个新 token 。
这是正确的行。
public DateTime IssuedAt => DateTime.UtcNow;
感谢您的帮助!
关于c# - .net core 2.0 JWT token 过期问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50054131/