问题描述

当我尝试访问授权属性下的方法时，我正在尝试写入日志.基本上，我想记录一个人是否使用了无效令牌或过期令牌.我正在使用 JWT 的基本身份验证

I'm trying to write to a log when I person tries to access a method under an Authorize Attribute. Basically, I want to log if a person uses an invalid token or an expired token. I'm using basic Authentication for JWT

services.AddAuthentication(o =>
{
    o.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    o.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
}).AddJwtBearer(cfg =>
    {
        cfg.RequireHttpsMetadata = false;
        cfg.SaveToken = true;

        cfg.TokenValidationParameters = new TokenValidationParameters()
        {
            ValidAudience = jwtAudience,
            ValidIssuer = jwtIssuer,
            IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(jwtSecurityKey))
        };

    });

有没有办法我可以在授权检查中添加一段代码，以记录授权尝试是否有效以及为什么无效?

Is there a way I can add a piece of code to the authorization check that logs if a authorization attempt was valid and why it wasn't?

推荐答案

您可以访问 JwtBearerEvents 对象，该对象定义了在处理不记名令牌时引发的许多事件.

You have access to the JwtBearerEvents object, which defines a number of events that are raised as the bearer token is processed.

验证失败
如果在请求处理期间抛出异常，则调用.除非被抑制，否则异常将在此事件之后重新抛出.

OnAuthenticationFailed
Invoked if exceptions are thrown during request processing. The exceptions will be re-thrown after this event unless suppressed.

挑战在将质询发送回调用方之前调用.

OnChallenge Invoked before a challenge is sent back to the caller.

OnMessageReceived
在第一次收到协议消息时调用.

OnMessageReceived
Invoked when a protocol message is first received.

OnTokenValidated
在安全令牌通过验证并生成 ClaimsIdentity 后调用.

OnTokenValidated
Invoked after the security token has passed validation and a ClaimsIdentity has been generated.

https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.authentication.jwtbearer.jwtbearerevents?view=aspnetcore-2.0

在AddJwtBearer初始化配置时，添加你想订阅的事件，

When initialising the configuration at AddJwtBearer, add the events you'd like to subscribe to,

.AddJwtBearer(o =>
{
    o.Events = new JwtBearerEvents()
    {
        OnAuthenticationFailed = c =>
        {
            // do some logging or whatever...
        }

    };
});

查看源代码以了解何时可能引发事件，

Have a look at the source to see when events might be raised,

https://github.com/aspnet/Security/blob/dev/src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerHandler.cs

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