4/2/2023 0 Comments Subsume meaning![]() Required by the request, the frame loads successfully. Since the policy asserted by the response allows strictly fewer requests than the policy It can do so by emitting a policy that includes theĮmbedder’s restrictions, and adds more on top:Ĭontent-Security-Policy: script-src object-src 'none' For example, it might wish to ensure that no plugins are loaded, Own Content-Security-Policy header that’s at least as strong as the policy The advertisement server in the example above could also accept the restrictions by emitting its No such assertion is present, the response will be blocked. Or accepts the embedder-provided policy, then the user agent will render the embedded content. If the response contains a policy at least as strict as the policy which the embedder requested, Policy, it can enforce it by returning a Content-Security-Policy or Allow-CSP-From header along with the response. This policy is transmitted along with the HTTP request for the framed content in an In short, the embedder proposes a Content Security Policy by setting an attribute on an iframe element. Proposes a mechanism which relies on an explicit opt-in from the embeddedĬontent, which ought to make it possible for widgets to cooperate with theirĮmbedders to negotiate a reasonable set of restrictions. Widgets, advertisements, and other kinds of third-party content. ![]() That said, it would be quite useful to be able to place restrictions upon To avoid reintroducing them in a new form. Of issues in past features such as X-XSS-Protection, so we must be careful Secure page by denying it access to particular scripts. Loading, and it’s very possible to introduce vulnerabilities into an otherwise Allowing CSP to apply directly to these third-partyĬontexts would be dangerous CSP gives quite granular control over resource Give developers the ability to apply restrictions to third-party content Malicious script, style, and other resource types. 4.3 Does subsuming policy subsume policy list given their respective origins? Ĭontent Security Policy is a great defense against cross-site scriptingĪttacks, allowing developers to harden their own sites against injection of.4.2.5 Does policy A subsume policy B given their respective origins?.4.2.4 Does source list A subsume source list B given their.4.2.3 Does source expression A subsume source expression B?.4.2.2 Rewrite 'self' into a host-source expression for origin.4.2.1 What is an intersection of two expressions matching scheme-source or host-source grammar A and B?.4.2 Does response allow blanket enforcement of policy from request?.4.1 Is response to request blocked by context’s required CSP?.2.3 The Allow-CSP-From HTTP Response Header.2.2 The Sec-Required-CSP HTTP Request Header.This document is governed by the 15 September 2020 W3C Process Document. ![]() That page also includes instructions for disclosing a patent.Īn individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy. W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group This document was produced by a group operating under This document was produced by the Web Application Security Working Group. Please put the text “csp-embedded-enforcement” in the subject, Is preferred for discussion of this specification. The ( archived) public mailing list (see instructions) Its publication here does not imply endorsement of its contents by W3C.ĭon’t cite this document other than as work in progress.Ĭhanges to this document may be tracked at. It is provided for discussion only and may change at any moment. This is a public copy of the editors’ draft.
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