Webkit的跨域安全问题说明

这里有个简单的测试页面:IE、火狐弹出"hello world",而chrome,safari,opera毫无反应。
以下是小段测试代码(刻意修改domain,让父页面和子页面为不同域页面):
1.父页面代码:

代码如下:

<script> 
document.domain = "nunumick.me"; 
function doTest(){ 
alert('hello world'); 
} 
</script> 
<iframe src="http://www.nunumick.me/lab/x-domain/webkit-test.html"> 
</iframe>

2.子页面代码:

代码如下:

<script> 
try{ 
top.name; 
}catch(e){ 
document.domain = 'nunumick.me'; 
top.doTest(); 
} 
</script>

以上代码目的是尝试在访问异常时动态修改domain达到顺利访问,但webkit内核浏览器粗暴地报错而非抛出可截获的异常,其他浏览器均如期运行。

chrome错误信息:
Webkit的跨域安全问题说明

据了解,采用此类try catch方式做安全可行性判断的并不只是个别现象,如DOJO

代码如下:

try{ 
//see if we can access the iframe's location 
//without a permission denied error 
var iframeSearch = _getSegment(iframeLoc.href, "?"); 
//good, the iframe is same origin (no thrown exception) 
if(document.title != docTitle){ 
//sync title of main window with title of iframe. 
docTitle = this.iframe.document.title = document.title; 
} 
}catch(e){ 
//permission denied - server cannot be reached. 
ifrOffline = true; 
console.error("dojo.hash: Error adding history 
entry. Server unreachable."); 
}

再如FCKeditor

代码如下:

try{ 
if ( (/fcksource=true/i).test( window.top.location.search ) ) 
sFile = 'fckeditor.original.html' ; 
} 
catch (e) { /* Ignore it. Much probably we are insi 
de a FRAME where the "top" is in another domain (security error). */ }

还有很多网友的反馈:chrome bug report

以上代码在chrome,safari,opera均不适用。翻了一些资料,记录在此:
1.html5 security location
2.webkit dev lists
从webkit开发人员的讨论消息中看到,他们承认这个问题但并不情愿去改正,holly shit!

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