I am trying to access the DOM of an iframe that loads an external URL. Of course that I get a "Permission denied for" error due to cross domain security. How can I make this work? I saw something done with json (but I can not get a json string from my external source) and something done with HTML5 postmessage.
you can see it live at :
http://jsfiddle.net/QPBvJ/
The code is:
$(document).ready(function(){
$('#get').live('click', function() {
var currentIFrame = $('#frameDemo');
currentIFrame.contents().find("a").css("background-color","#BADA55");
alert ("done")
});
});
<iframe src="http://api.jquery.com/" width="80%" height="600" id='frameDemo'></iframe>
<button id="get">Get</button>
What would the the easiest way to make this work.
Thank you
There is no way to make this work. Unless, the foreign domain you try to access supports a procedure like C.O.R.S, JSONP or postMessage.
There are a few exceptions (like always):
If you're dealing with a WebApp for instance, you can tell your users that they have to grant access to cross-domain-calls.
In Gecko/Firefox for instance, you can call
netscape.security.PrivilegeManager.enablePrivilege('UniversalBrowserRead')
which enables the browser to access foreign domains via ajax/iframes. In this scenario, an user has to set
signed.applets.codebase_principal_support
to true under about:config to make this work.
In the Internet Explorers of this world, there is a setting called something like allow cross-domain access deeply hidden in the security tab, which must be set to enable.
Chrome allows cross-domain calls with a commandline argument:
chrome.exe --disable-web-security
Related
I have a html page with an iFrame on another domain.
<iframe id="myframe"src="https://www.example.com" height="1000" width=100%>
I want to get some info of that website and used them on my html page. For example I want to extract the tag and set it as title of my html.
I used this code I found on W3School
var iframe = document.getElementById("myframe");
var y = (iframe.contentWindow || iframe.contentDocument);
if (y.document)y = y.document;
var strHeader = y.body.getElementsByClassName("header");
I wrote in with IDE HelloWebFree (similar to notepad++). When I try my code within the IDE it works fine. But when I try to open it with safari, Google Chrome or Firefox it doesn't work.
I get the error:"SecurityError: Permission denied to access property "document" on cross-origin object".
I don't need to change anything to the iframe content, I just want to read it and use it in my own html. So I don't see why it is a security issue. Why does it works within my IDE and not in the browser?
I have read a lot of post about this issue, but the most ones or more then 5 years old and not applicable anymore. someone an idea?
The reason this happens in browsers is to protect the user's security.
It is in place to protect the user from any random website reading his personal info from his Facebook, or Banking website or whatever.
If you want to access public information from a website, then I suggest scraping it on the backend.
We have an intranet website, lets call it https://www.myintranetsite.com. Note that I can't access its source code.
I would like to use it in another web page in an IFrame, so I am creating a very basic HTML page like:
<html><body>
<div>
<iframe id="myIframe" width="100%" height="1200px" src="https://www.myintranetsite.com/"></iframe>
</div>
</body></html>
When I open the HTML page with Microsoft Edge, it works, however Google Chrome does not work and it shows the error below:
When I do F12 in the browser, the error message I see in the console is on below:
Uncaught ReferenceError: $ is not defined
at login?isajax=true:19
As I understand, JQuery is used in the myintranetsite.com and Chrome does not load it for some reason, probably security related... Version of Chrome: 81.0.4044.122 (64bit)
How can I overcome this issue? I've tried those but no help:
clearing the cache,
adding myintranetsite to trusted sites in internet options,
clearing SSL Stage,
disabling cookies in
chrome
I've checked this but it did not help either: jQuery/iframe not working in Chrome
Any help or advice would be appreciated.
Your understanding that this is prevented by security measures is correct, basically you get a jQuery error because jQuery would be loaded by the inner page, but since the inner page is not loaded, it's not loading jQuery either. You will need to create some proxy pages, let's see the steps:
Step 1
Create a separate page, let's call it myintranetproxy. I will assume that the location of this page you create is /myintranetproxy, so, if you have different routes, feel free to make the changes you need.
Step 2
Make sure that myintranetproxy shows a text or something at this stage, like 'Hello World', just to ensure that it's loaded at the next step.
Step 3
Load myintranetproxy:
<html><body>
<div>
<iframe id="myIframe" width="100%" height="1200px" src="/myintranetproxy"></iframe>
</div>
</body></html>
now you should see your temporary content inside the iframe.
Step 4
Change myintranetproxy, it should now send a GET request to https://www.myintranetsite.com/ and once the response arrives, write that HTML as it is instead of your "Hello World"
Step 5
Make sure that you change any URL in the response you get to the absolute URL of the page. This will affect iframe, script, link, img tags. You can implement this, or use an HTML parser for this purpose.
The most likely cause is that your somehow mixing HTTP and HTTPS. Chrome really does not like this, make sure your parent page and the page in the iframe are both using the same protocol
Sometimes iFrames are disabled as mitigation against clickjacking attempts.
In order for the intranet site to be framed, all of the mitigations below would need to be disabled.
Content Security Policy (CSP) frame-ancestors directive
X-Frame-Options Response Headers
Legacy Browser Frame Breaking Script
more about those clickjacking mitigations and how to enable/disable those protections can be found here
Also, if your site requires session cookies, the end-user will have to ensure that third party cookies are enabled. (Safari has them turned off by default for example).
I am developing a web page that needs to display, in an iframe, a report served by another company's SharePoint server. They are fine with this.
The page we're trying to render in the iframe is giving us X-Frame-Options: SAMEORIGIN which causes the browser (at least IE8) to refuse to render the content in a frame.
First, is this something they can control or is it something SharePoint just does by default? If I ask them to turn this off, could they even do it?
Second, can I do something to tell the browser to ignore this http header and just render the frame?
If the 2nd company is happy for you to access their content in an IFrame then they need to take the restriction off - they can do this fairly easily in the IIS config.
There's nothing you can do to circumvent it and anything that does work should get patched quickly in a security hotfix. You can't tell the browser to just render the frame if the source content header says not allowed in frames. That would make it easier for session hijacking.
If the content is GET only you don't post data back then you could get the page server side and proxy the content without the header, but then any post back should get invalidated.
UPDATE: 2019-12-30
It seem that this tool is no longer working! [Request for update!]
UPDATE 2019-01-06: You can bypass X-Frame-Options in an <iframe> using my X-Frame-Bypass Web Component. It extends the IFrame element by using multiple CORS proxies and it was tested in the latest Firefox and Chrome.
You can use it as follows:
(Optional) Include the Custom Elements with Built-in Extends polyfill for Safari:
<script src="https://unpkg.com/#ungap/custom-elements-builtin"></script>
Include the X-Frame-Bypass JS module:
<script type="module" src="x-frame-bypass.js"></script>
Insert the X-Frame-Bypass Custom Element:
<iframe is="x-frame-bypass" src="https://example.org/"></iframe>
The X-Frame-Options header is a security feature enforced at the browser level.
If you have control over your user base (IT dept for corp app), you could try something like a greasemonkey script (if you can a) deploy greasemonkey across everyone and b) deploy your script in a shared way)...
Alternatively, you can proxy their result. Create an endpoint on your server, and have that endpoint open a connection to the target endpoint, and simply funnel traffic backwards.
Yes Fiddler is an option for me:
Open Fiddler menu > Rules > Customize Rules (this effectively edits CustomRules.js).
Find the function OnBeforeResponse
Add the following lines:
oSession.oResponse.headers.Remove("X-Frame-Options");
oSession.oResponse.headers.Add("Access-Control-Allow-Origin", "*");
Remember to save the script!
As for second question - you can use Fiddler filters to set response X-Frame-Options header manually to something like ALLOW-FROM *. But, of course, this trick will work only for you - other users still won't be able to see iframe content(if they not do the same).
I'm working over the same domain giving the ability for a user to navigate within the iframe on the page. I'd like to handle the onload of the iframe in Chrome and to process the actual href the user navigated to. When I'm trying to access
document.getElementById("contentFrame").contentWindow.location.href
it says undefined. Debugger tells that location is an object, but I cannot figure out what property to use.
any guess?
Chrome v15
If you really are on the same domain, use the same protocol and port it should work. Here's an example: http://jsfiddle.net/csVcL/1/
Maybe you're on different subdomains, in which case you need to use document.domain
If you are not in the same domain, you are not allowed to access the href or any other properties on the remote window.
I have an iframe-based online help system that has worked well for years. With IE8 it chokes on some of the javascripting that calls location.toString(). This same code works fine in IE6.
Specifically, the code is:
var iss = parent.left.location.toString();
var isInd = iss.indexOf("indexframe");
I get a "permission denied" error. I believe the problem is related to cross-domain communications, which I'm not sure I fully understand. The whole package runs locally using local HTML and javascript files. I'm not trying to have a frame in one domain control a frame in another domain. Or maybe I'm way off base in assuming this is the problem.
Could someone help me to understand what I need to do to work around this issue?
If the iFrame and the parent Document are in the same domain then you should not get that error. It suggests to me that the documents are in different domains.
If the Iframe is in www.mydomain.com and the document is in help.mydomain.com YOU WILL GET AN ERROR! The pages must think they are in the exact same domain.
In both documents you could add javascript the set the domain:
document.domain = "mydomain.com";
Javascript will allow you to drop into the host domain on both pages. This allows you to communicate accross the frames. Of course if the pages are in different HOST domains then this won't work and javascript will throw the error.
Typically when accessing the content of another iframe, i use something like this:
var f = document.getElementById('IdOfIFrame'),
d = f.contentDocument||f.contentWindow;
alert(d.location);
If you are indeed accessing 2 domains from your site, and you own both of them, you can create an xml file that specifies which domains should be allowed to share. See the spec document. This opt-in cross-site access is supported by more than just Adobe (MS Silverlight for one). Here is Silverlight's support spec.