在cookie中存储JWT令牌后，如何破解该cookie并在ASP.NET Core 3.1中获取信息

Question

在我的ASP.NET Core 3.1 MVC应用程序中，我想将JWT令牌存储在cookie中，然后在授权期间，我想破坏该令牌以获取用户信息。这是我如何在cookie中存储JWT令牌的代码。

var tokenHandler = new JwtSecurityTokenHandler();
var secrect = configuration.GetValue<string>("Secret");
var key = Encoding.ASCII.GetBytes(secrect);
var tokenDescriptor = new SecurityTokenDescriptor
{
Subject = new ClaimsIdentity(new Claim[]
{
new Claim(ClaimTypes.Name, user.UserName),
new Claim(ClaimTypes.NameIdentifier, user.UserId.ToString())
}),
Expires = DateTime.UtcNow.AddDays(1),
SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key),
SecurityAlgorithms.HmacSha256Signature)
};
var token = tokenHandler.CreateToken(tokenDescriptor);
var cookieOptions = new CookieOptions
{
// Set the secure flag, which Chrome's changes will require for SameSite none.
// Note this will also require you to be running on HTTPS.
Secure = false,
// Set the cookie to HTTP only which is good practice unless you really do need
// to access it client side in scripts.
HttpOnly = false,
// Add the SameSite attribute, this will emit the attribute with a value of none.
// To not emit the attribute at all set
// SameSite = (SameSiteMode)(-1)
// SameSite = SameSiteMode.Lax
};
//// Add the cookie to the response cookie collection
Response.Cookies.Append("auth-cookie", token.ToString(), cookieOptions);

Answer 1

您可以使用以下代码：

var secrect = configuration.GetValue<string>("Secret");
var key = Encoding.ASCII.GetBytes(secrect);
SecurityToken validatedToken;
TokenValidationParameters validationParameters = new TokenValidationParameters();
validationParameters.ValidateLifetime = true;
validationParameters.IssuerSigningKey = new SymmetricSecurityKey(key);
ClaimsPrincipal principal = new JwtSecurityTokenHandler().ValidateToken(jwtToken, validationParameters, out validatedToken);

然后访问值：

principal.Claims.SingleOrDefault(c => c.Type == ClaimTypes.Name)?.Value;