c# - .net 核心 - Jwt 中间件身份验证签名密钥被忽略

Question

我正在使用配置为使用 json Web 令牌的 openiddict：

// Add authentication
services.AddAuthentication();

// Add OpenId Connect/OAuth2
services.AddOpenIddict()
    .AddEntityFrameworkCoreStores<ApplicationDbContext>()
    .AddMvcBinders()
    .EnableTokenEndpoint("/connect/token")
    .AllowPasswordFlow()
    .AllowRefreshTokenFlow()
    .UseJsonWebTokens()      // access_token should be jwt
    // You can disable the HTTPS requirement during development or if behind a reverse proxy
    .DisableHttpsRequirement()
    // Register a new ephemeral key, that is discarded when the application
    // shuts down. Tokens signed using this key are automatically invalidated.
    // To be used during development
    .AddEphemeralSigningKey();

我已通过 JWT 中间件按以下方式配置：

// Add Jwt middleware for authentication
var secretKey = Configuration.Get<AppOptions>().Jwt.SecretKey;
app.UseJwtBearerAuthentication(new JwtBearerOptions
{
    AutomaticAuthenticate = true,
    AutomaticChallenge = true,
    RequireHttpsMetadata = env.IsProduction(),
    Audience = Configuration.Get<AppOptions>().Jwt.Audience,
    Authority = Configuration.Get<AppOptions>().Jwt.Authority,
    TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuerSigningKey = true,
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(secretKey)),

        ValidateIssuer = true,
        // makes no difference seemingly being ignored
        //ValidIssuer = Configuration.Get<AppOptions>().Jwt.Authority,

        ValidateAudience = true,
        ValidAudience = Configuration.Get<AppOptions>().Jwt.Audience,

        ValidateLifetime = true,
    }
});

// Add OpedId Connect middleware
app.UseOpenIddict();

如您所见，颁发者签名密钥设置为对称密钥：

IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(secretKey)),

但是创建的 jwt access_tokens 已将alg声明设置为RS256，因此似乎此设置被忽略了，并且 openiddict 使用 RSA 私钥对生成的令牌进行签名

.AddEphemeralSigningKey();

Answer 1

为了强制 openiddict 使用对称密钥，它必须在 openiddict 中配置

 services.AddOpenIddict()
.AddEntityFrameworkCoreStores<ApplicationDbContext>()
.AddMvcBinders()
.EnableTokenEndpoint("/connect/token")
.AllowPasswordFlow()
.AllowRefreshTokenFlow()
.UseJsonWebTokens()
// You can disable the HTTPS requirement during development or if behind a reverse proxy
.DisableHttpsRequirement()

// set your symmetric key

.AddSigningKey(new SymmetricSecurityKey(Encoding.ASCII.GetBytes(Configuration.Get<AppOptions>().Jwt.SecretKey)));

Answer 2

在 .net 2.0 中，您还应该在 JWT 中间件中注册您的密钥，如下所示：

  services.AddAuthentication(opt => {
                opt.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
                opt.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
            })
            .AddJwtBearer(options =>
            {
                options.RequireHttpsMetadata = false;
                options.SaveToken = true;
                //options.Audience = "http://localhost:13818/";
                //options.Authority = "http://localhost:13818/";                
                options.TokenValidationParameters = new 
                TokenValidationParameters
                {
                    ValidateIssuerSigningKey = true,
                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes("iNivDmHLpUA223sqsfhqGbMRdRj1PVkH")),
                    ValidateIssuer = true,
                    ValidateAudience = true,
                    ValidateLifetime = true
                };
            });