Where can I specify in TokenValidationParameters that the algorithm in JWT token should match HS256?












0














I am using AspNet Core to build a web api and JWT tokens to authenticate users.



Where can I specify in TokenValidationParameters that the alg in token should match HS256 (and never none)?



    services
.AddAuthentication(options =>
{
options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(cfg =>
{
cfg.RequireHttpsMetadata = false;
cfg.SaveToken = true;
string jwtIssuer = configuration["JwtIssuer"];
SymmetricSecurityKey securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["JwtKey"]));
cfg.TokenValidationParameters = new TokenValidationParameters
{
ValidIssuer = jwtIssuer,
ValidAudience = jwtIssuer,
ValidateIssuerSigningKey = true,
IssuerSigningKey = securityKey,
ClockSkew = TimeSpan.Zero
};
});


And does the library, by default, reject incoming tokens with alg set to none?










share|improve this question



























    0














    I am using AspNet Core to build a web api and JWT tokens to authenticate users.



    Where can I specify in TokenValidationParameters that the alg in token should match HS256 (and never none)?



        services
    .AddAuthentication(options =>
    {
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
    })
    .AddJwtBearer(cfg =>
    {
    cfg.RequireHttpsMetadata = false;
    cfg.SaveToken = true;
    string jwtIssuer = configuration["JwtIssuer"];
    SymmetricSecurityKey securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["JwtKey"]));
    cfg.TokenValidationParameters = new TokenValidationParameters
    {
    ValidIssuer = jwtIssuer,
    ValidAudience = jwtIssuer,
    ValidateIssuerSigningKey = true,
    IssuerSigningKey = securityKey,
    ClockSkew = TimeSpan.Zero
    };
    });


    And does the library, by default, reject incoming tokens with alg set to none?










    share|improve this question

























      0












      0








      0







      I am using AspNet Core to build a web api and JWT tokens to authenticate users.



      Where can I specify in TokenValidationParameters that the alg in token should match HS256 (and never none)?



          services
      .AddAuthentication(options =>
      {
      options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
      options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
      options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
      })
      .AddJwtBearer(cfg =>
      {
      cfg.RequireHttpsMetadata = false;
      cfg.SaveToken = true;
      string jwtIssuer = configuration["JwtIssuer"];
      SymmetricSecurityKey securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["JwtKey"]));
      cfg.TokenValidationParameters = new TokenValidationParameters
      {
      ValidIssuer = jwtIssuer,
      ValidAudience = jwtIssuer,
      ValidateIssuerSigningKey = true,
      IssuerSigningKey = securityKey,
      ClockSkew = TimeSpan.Zero
      };
      });


      And does the library, by default, reject incoming tokens with alg set to none?










      share|improve this question













      I am using AspNet Core to build a web api and JWT tokens to authenticate users.



      Where can I specify in TokenValidationParameters that the alg in token should match HS256 (and never none)?



          services
      .AddAuthentication(options =>
      {
      options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
      options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
      options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
      })
      .AddJwtBearer(cfg =>
      {
      cfg.RequireHttpsMetadata = false;
      cfg.SaveToken = true;
      string jwtIssuer = configuration["JwtIssuer"];
      SymmetricSecurityKey securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["JwtKey"]));
      cfg.TokenValidationParameters = new TokenValidationParameters
      {
      ValidIssuer = jwtIssuer,
      ValidAudience = jwtIssuer,
      ValidateIssuerSigningKey = true,
      IssuerSigningKey = securityKey,
      ClockSkew = TimeSpan.Zero
      };
      });


      And does the library, by default, reject incoming tokens with alg set to none?







      security asp.net-core .net-core jwt






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 21 at 0:20









      Jagan

      7418




      7418





























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