I am able to access cookies created locally by using req.cookies or grabbing something specific (req.cookies['myvar']).
Hoever, say a cookie was stored on a top-level domain (domain.com) and then in my subdomain app (my.domain.com) -- how would I grab a cookie value from a certain domain?
The Domain and Path directives define the scope of the cookie: what URLs the cookies should be sent to.
Domain specifies allowed hosts to receive the cookie. If unspecified, it defaults to the host of the current document location, excluding subdomains. If Domain is specified, then subdomains are always included.
For example, if Domain=mozilla.org is set, then cookies are included on subdomains like developer.mozilla.org.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Cookies#Scope_of_cookies
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I have a Koa API which is setting a cookie accessToken which is used by a react front end, running on a different domain.
Because the cookie is set by the API on a different domain, it is considered a third party cookie by the browser which causes issues. Particularly in Safari where it doesn't get saved in the browser by default.
Is there a way I can tell the server to set a cookie with the domain name of the front end so that the front end thinks it's a first party cookie?
I am setting my cookie like so:
ctx.cookies.set("accessToken", accessToken, {
httpOnly: true,
domain: "example.com"
})
If example.com is the front ends domain, should the cookie be interpreted as a first party cookie?
Is this even possible to set a cookie for a different domain?
Thanks
The user agent will reject cookies unless the Domain attribute specifies a scope for the cookie that would include the origin server. For example, the user agent will accept a cookie with a Domain attribute of "example.com" or of "foo.example.com" from foo.example.com, but the user agent will not accept a cookie with a Domain attribute of "bar.example.com" or of "baz.foo.example.com".
NOTE: For security reasons, many user agents are configured to reject Domain attributes that correspond to "public suffixes". For example, some user agents will reject Domain attributes of "com" or "co.uk". (See Section 5.3 for more information.)
But the above mentioned workaround with image/iframe works, though it's not recommended due to its insecurity.
See RFC6265
I have a website that will have customers logging into:
www.example.com/login
and will do their authenticated tasks here
www.example.com/dashboard/
Customers will also have their own public facing content here:
customer1.example.com
The public facing content is where they can't write their own content, so I am concerned if they write some javascript etc. to grab cookie information somehow i.e. they write javascript, and when a different user goes to their site who was authenticated on www.example.com, the javascript will grab their session cookie and send it over to another website.
When cookies are stored at the root domain and sub-domain, are they free accessible at each level?
Trying to understand the security implications.
Cookies will be accessible for all subdomains of the host you specify in the Domain attribute.
If you set Domain=example.com, the cookies will be available to all subdomains of example.com.
A cookie with Domain=www.example.com will only be accessible for www.example.com and subdomains of www.example.com (e.g. foo.bar.www.example.com) - no worries if you do that.
However, note that this also means it won't be accessible from example.com.
The most restrictive option is to omit the Domain attribute, by not sending it at all. In that case, the cookie should only be accessible for the hostname that sent it. That is, if you send it from www.example.com, it will only be sent back to www.example.com and not even to its subdomains.
This is all explained in RFC 6265, section 4.1.2.3.
I am using express-session module for maintain session. i have two app. i want to share cookies with this apps, parent app run in example.com , and child app run in child.example.com. i set httponly cookie using express-session it sets in the child app.i can verified that cookie in resource tab in chrome debugger.
Network tab:
When the first call to sub-domain:
it load like "http://www.child.example.com" cookie set in the request. while the url is redirect to server IP . cookie not available after that.
like http://13.25.230.2/index cookie not avaliable on that
When you send the Set-Cookie HTTP header, you can specify the domain it is for.
Set-Cookie: name=value; domain=example.com
The domain must be a suffix of the domain hosting the page.
i.e. foo.example.com, bar.baz.example.com and www.example.com can all share a cookie belonging to example.com.
A URL using an IP address has no hostname in it at all and cannot match that rule.
There is no way to share your cookie between example.com and 13.25.230.2. Give the site a hostname instead.
There is no way you can set cookie using setcookie header from one host to another. For example from example.com to foobar.com.
If you have to do it. Then do it by passing the cookie value to server side script for example foobar.com\set-my-cookie.php and use to to save the cookie.
Httponly cookies cannot be set or read from client side code.
Should I set a domain on cookies and if so why? -
The cookie is used for a shopping basket, the platform is .NET
No, you don't need to. If the cookie header field does not have a domain attribute, the effective domain is the domain of the request.
You will want to set the domain in specific scenarios, if you want to make your www.website.com cookie to be avaliable at api.website.com you will need to set the domain to .website.com.
Also, there is no way to make the www.website.com cookie be avaliable at a different domain by setting its domain (security issue).
I have server, running some number of sites.
For example: example.com a.example.com b.example.com
All sites are routed via nginx to unix domain-sockets.
Each of sites is gunicorn instance.
Can applications from subdomains read/write cookie data from example.com or from other subdomains?
If yes, how to disable it?
Sure, you can use separate cookies for the subdomain. The Cookie standards allow you to set a domain, which will be the only domain that browsers will send the cookie back to. You can set "a.example.com" as the domain, and browsers will only send cookies from that domain back to that domain.
From my reading of RFC 2965 for cookies, "a.example.com" cannot set a cookie for "b.example.com", only "example.com".
I think the bottom line is to be sure that you are are using the "domain" property of cookies to set cookies for the subdomain, and not just "example.com", which all subdomains could read and write to.