Php 哪些请求头可用于浏览器/客户端指纹？

为了增加安全性，我们的服务器跟踪浏览器指纹。目前，我们使用以下标题：

• “HTTP_CLIENT_IP”、“HTTP_X_FORWARDED_FOR”、“HTTP_X_FORWARDED”、“HTTP_CLUSTER_CLIENT_IP”、“HTTP_FORWARDED_FOR”、“HTTP_FORWARDED”、“REMOTE_ADDR”（以第一个非空作为客户端IP）
• HTTP_-ACCEPTxxxx
• HTTP\u用户\u代理

是否还有其他（可选）标题可供使用

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一般来说，计算客户端指纹的最佳“算法”是什么？

您可以使用唯一的浏览器指纹（用户代理、web浏览器、画布等），然后获取哈希值

/* Generate a fingerprint string for the browser */
function generateFingerprint(){
//Generate a string based on "stable" information taken from the browser
//We call here "stable information", information that normally don't   change during the user
//browse the application just after authentication
var fingerprint = [];

//Take plugins
for(var i = 0; i < navigator.plugins.length; i++){
   fingerprint.push(navigator.plugins[i].name);
   fingerprint.push(navigator.plugins[i].filename);
   fingerprint.push(navigator.plugins[i].description);
   fingerprint.push(navigator.plugins[i].version);
}

//Take User Agent
fingerprint.push(navigator.userAgent);

//Take Screen resolution
fingerprint.push(screen.availHeight);
fingerprint.push(screen.availWidth);
fingerprint.push(screen.colorDepth);
fingerprint.push(screen.height);
fingerprint.push(screen.pixelDepth);
fingerprint.push(screen.width);

//Take Graphical card info
//See http://output.jsbin.com/ovekor/3/
try {
    //Add a Canvas element if the body do not contains one
    if ( $("#glcanvas").length == 0 ){
        $(document.body).append("<canvas id='glcanvas'></canvas>");
    }
    //Get ref on Canvas
    var canvas = document.getElementById("glcanvas");
    //Retrieve Canvas properties
    gl = canvas.getContext("experimental-webgl");
    gl.viewportWidth = canvas.width;
    gl.viewportHeight = canvas.height;
    fingerprint.push(gl.getParameter(gl.VERSION));
    fingerprint.push(gl.getParameter(gl.SHADING_LANGUAGE_VERSION));
    fingerprint.push(gl.getParameter(gl.VENDOR));
    fingerprint.push(gl.getParameter(gl.RENDERER));
    fingerprint.push(gl.getSupportedExtensions().join());
} catch (e) {
    //Get also error because it's will be stable too..
    fingerprint.push(e);
}

//Last and, in order to made this browser unique, generate a random ID that we will store
//in local storage (in order to be persistent after browser close/reopen)
//Add this ID because, in Enterprise, most of the time browser have the same configuration
var browserUniqueID = localStorage.getItem("browserUniqueID");
if (browserUniqueID === null) {
  localStorage.setItem("browserUniqueID", CryptoJS.lib.WordArray.random(80));
  browserUniqueID = localStorage.getItem("browserUniqueID");
}
fingerprint.push(browserUniqueID);

return fingerprint.join();
}

资料来源：

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仅供参考，所有这些信息都可以被欺骗，但是，用户代理和IP地址可以被使用……您正在允许任何人在此处欺骗任何其他人的指纹，祝贺您。只有

REMOTE\u ADDR

保证是正确的，其他任何内容都是用户提供的任意信息。除非您确切地知道您控制下的代理已经设置了它们，否则您永远不应该使用任何可选的*_IP头。简言之，这也是HTTP头进行任何类型指纹识别的问题。@deceze：对于IP，并非所有用户都有公共IP，许多用户可能使用一个公共IP（在我的国家，至少有10000个用户使用一个IP）。deceze：注意“安全”之前的“添加”一词。@Patrick Sure，我没想到这是你唯一的安全措施。由于上述问题，它仍然存在问题，添加它几乎没有意义。此外，IP可以在任何时候出于完全合理的原因进行更改，因此要求它们保持不变可能会让用户非常恼火。

//Call the fingerprint dedicated function
var fingerprint = generateFingerprint();
//Use CryptoJS library ot generate a hex encoded string of the hash of the fingerprint
var fingerprintHash = CryptoJS.SHA256(fingerprint);