asp.net“记住我”曲奇饼

Question

我已经使用它在我的 asp.net webform 中实现了“记住我”选项，

protected void LBtnSubmit_Click(object sender, EventArgs e)
 {
  if (this.ChkRememberme != null && this.ChkRememberme.Checked == true)
  {
     HttpCookie cookie = new HttpCookie(TxtUserName.Text, TxtPassword.Text);
     cookie.Expires.AddYears(1);
     Response.Cookies.Add(cookie);
  }
}

我这样做的方式正确吗？任何建议..我正在使用 Windows 身份验证，并且我不使用 asp.net 会员资格..

Answer 1

不要直接将用户名和密码存储在 cookie 中，而是将用户名和密码的哈希值以及盐存储在 cookie 中，然后当您验证 cookie 时，检索给定用户名的密码，使用密码和相同的盐并进行比较。

创建哈希非常简单，只需将密码和盐值一起存储在字符串中，将字符串转换为字节数组，计算字节数组的哈希（使用 MD5 或您喜欢的任何内容）并将生成的哈希转换为字符串（可能通过base64编码）。

这是一些示例代码：

// Create a hash of the given password and salt.
public string CreateHash(string password, string salt)
{
    // Get a byte array containing the combined password + salt.
    string authDetails = password + salt;
    byte[] authBytes = System.Text.Encoding.ASCII.GetBytes(authDetails);

    // Use MD5 to compute the hash of the byte array, and return the hash as
    // a Base64-encoded string.
    var md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
    byte[] hashedBytes = md5.ComputeHash(authBytes);
    string hash = Convert.ToBase64String(hashedBytes);

    return hash;
}

// Check to see if the given password and salt hash to the same value
// as the given hash.
public bool IsMatchingHash(string password, string salt, string hash)
{
    // Recompute the hash from the given auth details, and compare it to
    // the hash provided by the cookie.
    return CreateHash(password, salt) == hash;
}

// Create an authentication cookie that stores the username and a hash of
// the password and salt.
public HttpCookie CreateAuthCookie(string username, string password, string salt)
{
    // Create the cookie and set its value to the username and a hash of the
    // password and salt. Use a pipe character as a delimiter so we can
    // separate these two elements later.
    HttpCookie cookie = new HttpCookie("YourSiteCookieNameHere");
    cookie.Value = username + "|" + CreateHash(password, salt);
    return cookie;
}

// Determine whether the given authentication cookie is valid by
// extracting the username, retrieving the saved password, recomputing its
// hash, and comparing the hashes to see if they match. If they match,
// then this authentication cookie is valid.
public bool IsValidAuthCookie(HttpCookie cookie, string salt)
{
    // Split the cookie value by the pipe delimiter.
    string[] values = cookie.Value.Split('|');
    if (values.Length != 2) return false;

    // Retrieve the username and hash from the split values.
    string username = values[0];
    string hash = values[1];

    // You'll have to provide your GetPasswordForUser function.
    string password = GetPasswordForUser(username);

    // Check the password and salt against the hash.
    return IsMatchingHash(password, salt, hash);
}

Answer 2

我不会将用户密码存储在 cookie 中...而是将用户 ID 和 IP 地址存储在 cookie 中。

Answer 3

我不会将 ip / 用户 ID 存储在 cookie 中。会话劫持将非常容易，我的意思是我知道我同事的用户名/IP，我可以将该 cookie 添加到我的消息中，然后我可以处理我同事的会话。