CSP: frame-ancestors
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since August 2016.
The HTTP Content-Security-Policy
(CSP) frame-ancestors
directive specifies valid parents that may embed a page using <frame>
, <iframe>
, <object>
, or <embed>
.
Setting this directive to 'none'
is similar to X-Frame-Options
: deny
(which is also supported in older browsers).
Note: frame-ancestors
allows you to specify what parent source may embed a page.
This differs from frame-src
, which allows you to specify where iframes in a page may be loaded from.
CSP version | 2 |
---|---|
Directive type | Navigation directive |
default-src fallback |
No. Not setting this allows anything. |
This directive is not supported in the <meta>
element.
|
Syntax
One or more sources can be set for the frame-ancestors
policy:
Content-Security-Policy: frame-ancestors <source>;
Content-Security-Policy: frame-ancestors <space separated list of sources>;
Sources
<source> can be one of the following:
Note: The frame-ancestors
directive's syntax is similar to a source list of other directives (e.g. default-src
), but doesn't allow 'unsafe-eval'
or 'unsafe-inline'
for example. It will also not fall back to a default-src
setting. Only the sources listed below are allowed:
- <host-source>
-
Internet hosts by name or IP address, as well as an optional URL scheme and/or port number, separated by spaces. The site's address may include an optional leading wildcard (the asterisk character,
'*'
), and you may use a wildcard (again,'*'
) as the port number, indicating that all legal ports are valid for the source. Single quotes surrounding the host are not allowed. Examples:-
https://*.example.com
: Matches all attempts to load from any subdomain of example.com using thehttp:
URL scheme. -
mail.example.com:443
: Matches all attempts to access port 443 on mail.example.com. -
https://store.example.com
: Matches all attempts to access store.example.com usinghttps:
.
Warning: If no URL scheme is specified for a
host-source
and the iframe is loaded from anhttps
URL, the URL for the page loading the iframe must also behttps
, per the Does URL match expression in origin with redirect count? section of the CSP spec. -
- <scheme-source>
-
A scheme such as
http:
orhttps:
. The colon is required and scheme should not be quoted. You can also specify data schemes (not recommended).data:
Allowsdata:
URLs to be used as a content source. This is insecure; an attacker can also inject arbitrarydata:
URLs. Use this sparingly and definitely not for scripts.mediastream:
Allowsmediastream:
URIs to be used as a content source.blob:
Allowsblob:
URIs to be used as a content source.filesystem:
Allowsfilesystem:
URIs to be used as a content source.
'self'
-
Refers to the origin from which the protected document is being served, including the same URL scheme and port number. You must include the single quotes. Some browsers specifically exclude
blob
andfilesystem
from source directives. Sites needing to allow these content types can specify them using the Data attribute. 'none'
-
Refers to the empty set; that is, no URLs match. The single quotes are required.
Examples
Content-Security-Policy: frame-ancestors 'none';
Content-Security-Policy: frame-ancestors 'self' https://www.example.org;
Content-Security-Policy: frame-ancestors 'self' https://example.org https://example.com https://store.example.com;
Specifications
Specification |
---|
Content Security Policy Level 3 # directive-frame-ancestors |
Browser compatibility
BCD tables only load in the browser