新blog地址:http://hengyunabc.github.io/prevent-iframe-stealing/
缘起
在看资料时,看到这样的防止iframe嵌套的代码:
try { if (window.top != window.self) { var ref = document.referer; if (ref.substring(0, 2) === '//') { ref = 'http:' + ref; } else if (ref.split('://').length === 1) { ref = 'http://' + ref; } var url = ref.split('/'); var _l = {auth: ''}; var host = url[2].split('@'); if (host.length === 1) { host = host[0].split(':'); } else { _l.auth = host[0]; host = host[1].split(':'); } var parentHostName = host[0]; if (parentHostName.indexOf("test.com") == -1 && parentHostName.indexOf("test2.com") == -1) { top.location.href = "http://www.test.com"; } }} catch (e) {}
假定test.com,test2.com是自己的域名,当其它网站恶意嵌套本站的页面时,跳转回本站的首页。
上面的代码有两个问题:
无论在任何语言里,都不建议手工写代码处理URL。因为url的复杂度超出一般人的想像。很多安全的问题就是因为解析URL不当引起的。比如防止CSRF时判断referrer。
URI的语法:
http://en.wikipedia.org/wiki/URI_scheme#Generic_syntax
在javascript里解析url最好的办法
在javascript里解析url的最好办法是利用浏览器的js引擎,通过创建一个a标签:
var getLocation = function(href) { var l = document.createElement("a"); l.href = href; return l;};var l = getLocation("http://example.com/path");console.debug(l.hostname)
简洁防iframe恶意嵌套的方法
下面给出一个简洁的防止iframe恶意嵌套的判断方法:
if(window.top != window && document.referrer){ var a = document.createElement("a"); a.href = document.referrer; var host = a.hostname; var endsWith = function (str, suffix) { return str.indexOf(suffix, str.length - suffix.length) !== -1; } if(!endsWith(host, '.test.com') || !endsWith(host, '.test2.com')){ top.location.href = "http://www.test.com"; }}
java里处理URL的方法
http://docs.oracle.com/javase/tutorial/networking/urls/urlInfo.html
用contain, indexOf, endWitch这些函数时都要小心。
public static void main(String[] args) throws Exception { URL aURL = new URL("http://example.com:80/docs/books/tutorial" + "/index.html?name=networking#DOWNLOADING"); System.out.println("protocol = " + aURL.getProtocol()); System.out.println("authority = " + aURL.getAuthority()); System.out.println("host = " + aURL.getHost()); System.out.println("port = " + aURL.getPort()); System.out.println("path = " + aURL.getPath()); System.out.println("query = " + aURL.getQuery()); System.out.println("filename = " + aURL.getFile()); System.out.println("ref = " + aURL.getRef()); }
参考
http://stackoverflow.com/questions/736513/how-do-i-parse-a-url-into-hostname-and-path-in-javascript
http://stackoverflow.com/questions/5522097/prevent-iframe-stealing