谷歌身份验证器Google Authenticator是谷歌推出的一款动态口令工具，解决大家各平台账户遭到恶意攻击的问题，一般在相关的服务平台登陆中除了用正常用户名和密码外，需要再输入一次谷歌认证器生成的动态口令才能验证成功，相当于输入二次密码，以达到账户的高安全性。
例如交易所、金融平台、以及一些钱包等项目等等，都会使用谷歌身份验证器Google Authenticator来做二次认证，开启谷歌身份验证之后，登录账户，除了输入用户名和密码，还需要输入谷歌验证器上的动态密码。谷歌验证器上的动态密码，也称为一次性密码，密码按照时间或使用次数不断动态变化（默认 30 秒变更一次）
代码参考：https://github.com/PHPGangsta/GoogleAuthenticator
关键代码：
<?php
// https://github.com/PHPGangsta/GoogleAuthenticator
error_reporting(0);// 关闭错误报告
session_start(); // 启动session
require_once 'PHPGangsta/GoogleAuthenticator.php';
$ga = new PHPGangsta_GoogleAuthenticator();
// $secret = $ga->createSecret();
// 自定义安全密钥
$secret = "62H6TMAXQTZBVTRB";
// 手机端扫描二维码获取动态口令
$qrCodeUrl = $ga->getQRCodeGoogleUrl('username', $secret);
echo "二维码地址: ".$qrCodeUrl."\n\n";
// 输出动态口令
$oneCode = $ga->getCode($secret);
echo "本次登录的动态口令：'$oneCode'\n";
// 动态口令认证
$checkResult = $ga->verifyCode($secret, $password,2); // 2 = 2*30sec clock tolerance
if ($checkResult) {
$_SESSION['username'] = $username;
echo "<h1>登录成功！</h1>";
header("Refresh: 5; url=main.php");
exit;
} else {
echo "<h1>登录失败！</h1>";
header("Refresh: 3; url=login.html");
exit;
}
?>
使用方法：
手机端安装 Microsoft Authenticator
下载地址：https://www.microsoft.com/en-us/security/mobile-authenticator-app
将以上代码生成的二维码地址在浏览器中访问
手机端扫描二维码获取动态验证码
代码示例：
login.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>系统运维管理平台</title>
<link rel="stylesheet" type="text/css" href="login.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
</head>
<body>
<div id="login">
<h1>Login</h1>
<form method="post" action="login.php">
<input type="text" required="required" placeholder="用户名" name="username"></input>
<input type="password" required="required" placeholder="密码" name="password"></input>
<button class="but" type="submit">登录</button>
</form>
</div>
</body>
</html>
login.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>系统运维管理平台</title>
<link rel="stylesheet" type="text/css" href="login.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
</head>
<body>
<div id="login">
<?php
// https://github.com/PHPGangsta/GoogleAuthenticator
error_reporting(0);// 关闭错误报告
session_start(); // 启动session
require_once 'PHPGangsta/GoogleAuthenticator.php';
$ga = new PHPGangsta_GoogleAuthenticator();
// $secret = $ga->createSecret();
# 自定义安全密钥
$secret = "62H6TMAXQTZBVTRB";
// $qrCodeUrl = $ga->getQRCodeGoogleUrl('admin', $secret);
// echo "二维码: ".$qrCodeUrl."\n\n";
// 检查用户是否已经登录
if (isset($_SESSION['username'])) {
// 用户已登录，显示用户信息或其他操作
header("Refresh: 3; url=main.php");
} else {
if(!isset($_SESSION['num'])){//isset() — 检测num变量是否设置。
$_SESSION['num'] = 0;
}
// 密码输入错误3次，将不允许登录！
if($_SESSION['num']<3){
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$username = $_POST['username'];
$password = $_POST['password'];
//此处应该从数据库中查询是否存在系统用户，再进行口令验证
if($username){
$oneCode = $ga->getCode($secret);
echo "本次登录的动态口令：'$oneCode'\n";
$checkResult = $ga->verifyCode($secret, $password,2); // 2 = 2*30sec clock tolerance
if ($checkResult) {
$_SESSION['username'] = $username;
echo "<h1>登录成功！</h1>";
header("Refresh: 5; url=main.php");
exit;
} else {
$_SESSION['num']++;
echo "<h1>登录失败！</h1>";
header("Refresh: 3; url=login.html");
exit;
}
}else{
echo "<h1>登录失败！</h1>";
header("Refresh: 3; url=login.html");
exit;
}
} else {
header("Location: login.html");
exit;
}
}else{
echo "<h1>密码输入错误已超过3次，系统已不允许登录！</h1>";
header("Refresh: 3; url=login.html");
exit;
}
}
?>
</div>
</body>
</html>
main.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>系统运维管理平台</title>
<link rel="stylesheet" type="text/css" href="login.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
</head>
<body>
<div id="login">
<?php
session_start(); // 启动session
if (isset($_SESSION['username'])) {
echo "<h2>".$_SESSION['username']."您已登录！</h2>";
echo "<h2><a href='logout.php'>退出登录</a></h2>";
} else{
header("Refresh: 3; url=login.html");
}
?>
</body>
</html>
logout.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>系统运维管理平台</title>
<link rel="stylesheet" type="text/css" href="login.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" />
</head>
<body>
<div id="login">
<?php
session_start();
if(isset($_SESSION['username']))
{
session_destroy();
}
header("Refresh: 3; url=login.html");
?>
</body>
</html>
login.css
html{
width: 100%;
height: 100%;
overflow: hidden;
font-style: sans-serif;
}
body{
width: 100%;
height: 100%;
font-family: 'Open Sans',sans-serif;
margin: 0;
background-color: #4A374A;
}
#login{
position: absolute;
top: 50%;
left:50%;
margin: -150px 0 0 -150px;
width: 300px;
height: 300px;
}
#login h1,h2{
color: #fff;
/* text-shadow:0 0 10px; */
letter-spacing: 1px;
text-align: center;
}
h1,h2{
font-size: 2em;
margin: 0.67em 0;
}
input{
width: 278px;
height: 18px;
margin-bottom: 10px;
outline: none;
padding: 10px;
font-size: 13px;
color: #fff;
/* text-shadow:1px 1px 1px; */
border-top: 1px solid #312E3D;
border-left: 1px solid #312E3D;
border-right: 1px solid #312E3D;
border-bottom: 1px solid #56536A;
border-radius: 4px;
background-color: #2D2D3F;
}
.but{
width: 300px;
min-height: 20px;
display: block;
background-color: #4a77d4;
border: 1px solid #3762bc;
color: #fff;
padding: 9px 14px;
font-size: 15px;
line-height: normal;
border-radius: 5px;
margin: 0;
}
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