php Basic HTTP与Digest HTTP 应用

Basic HTTP 认证范例

<?php
   //Basic HTTP 认证
  if (!isset($_SERVER['PHP_AUTH_USER'])) {
    header('WWW-Authenticate: Basic realm="test"');
    header('HTTP/1.0 401 Unauthorized');
  } else {
	if($_SERVER['PHP_AUTH_USER']=='admin' && $_SERVER['PHP_AUTH_PW']=='123456'){
		echo "<p>HI {$_SERVER['PHP_AUTH_USER']}.</p>";
		echo "<p>恭喜你登录成功！</p>";
	}else{
		header('WWW-Authenticate: Basic realm="test"');
		header('HTTP/1.0 401 Unauthorized');
	}
  }
?>

Digest HTTP 认证范例

<?php
$realm = 'Restricted area';

$username = 'ser';			//帐号
$passowrd = '666666';		//密码

if (empty($_SERVER['PHP_AUTH_DIGEST'])) {
    header('HTTP/1.1 401 Unauthorization Required');	//此头弹出登录窗口
    header('WWW-Authenticate: Digest realm="'.$realm.'",qop="auth", nonce="'.uniqid().'", opaque="'.md5($realm).'"');
    die('您取消了本次登录，若重新登录，请刷新此页面。');
}else{

	 //使用函数http_digest_parse解析验证信息
	if (!($data = http_digest_parse($_SERVER['PHP_AUTH_DIGEST'])) || $data['username']!=$username){
		header("HTTP/1.1 401 Unauthorization Required");
		header('WWW-Authenticate: Digest realm="'.$realm.'",qop="auth", nonce="'.uniqid().'", opaque="'.md5($realm).'"');//IE 8 需要重新发送，不然不弹窗
		die('账号错误！');
	}

	//拼接字符串
	$A1 = md5($username . ':' . $realm . ':' . $passowrd);
	$A2 = md5($_SERVER['REQUEST_METHOD'].':'.$data['uri']);
	$valid_response = md5($A1.':'.$data['nonce'].':'.$data['nc'].':'.$data['cnonce'].':'.$data['qop'].':'.$A2);

	if ($data['response'] != $valid_response){
	  header("HTTP/1.1 401 Unauthorization Required");
	  header('WWW-Authenticate: Digest realm="'.$realm.'",qop="auth", nonce="'.uniqid().'", opaque="'.md5($realm).'"');
	  die('账号/密码错误！');
	}

	echo 'Hi '.$username.',恭喜你登录成功！';
}

// 解析字符串方法
function http_digest_parse($txt)
{
    // protect against missing data
    $needed_parts = array('nonce'=>1, 'nc'=>1, 'cnonce'=>1, 'qop'=>1, 'username'=>1, 'uri'=>1, 'response'=>1);
    $data = array();

    preg_match_all('@(\w+)=([\'"]?)([a-zA-Z0-9=./\_-]+)\2@', $txt, $matches, PREG_SET_ORDER);
	//print_r($matches);
    foreach ($matches as $m) {
        $data[$m[1]] = $m[3];
        unset($needed_parts[$m[1]]);
    }

    return $needed_parts ? false : $data;
}
?>