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Propagate parent policy container to local iframes (#36710)

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This follows the rules as defined in
https://w3c.github.io/webappsec-csp/#security-inherit-csp
where local iframes (about:blank and about:srcdoc) should
initially start with the CSP rules of the parent. After
that, all new CSP headers should only be set on the
policy container of the iframe.

Part of #36437

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>
This commit is contained in:
Tim van der Lippe 2025-05-03 10:47:40 +02:00 • committed by GitHub
parent 4164f76769
commit 539ca27284
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11 changed files with 45 additions and 47 deletions
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4
components/script/script_thread.rs
View file

@ -3674,10 +3674,12 @@ impl ScriptThread {
None => vec![],
};
let policy_container = incomplete.load_data.policy_container.clone();
self.incomplete_loads.borrow_mut().push(incomplete);
let dummy_request_id = RequestId::default();
context.process_response(dummy_request_id, Ok(FetchMetadata::Unfiltered(meta)));
context.append_parent_to_csp_list(policy_container.as_ref());
context.process_response_chunk(dummy_request_id, chunk);
context.process_response_eof(
dummy_request_id,
@ -3697,12 +3699,14 @@ impl ScriptThread {
let srcdoc = std::mem::take(&mut incomplete.load_data.srcdoc);
let chunk = srcdoc.into_bytes();
let policy_container = incomplete.load_data.policy_container.clone();
self.incomplete_loads.borrow_mut().push(incomplete);
let mut context = ParserContext::new(id, url);
let dummy_request_id = RequestId::default();
context.process_response(dummy_request_id, Ok(FetchMetadata::Unfiltered(meta)));
context.append_parent_to_csp_list(policy_container.as_ref());
context.process_response_chunk(dummy_request_id, chunk);
context.process_response_eof(
dummy_request_id,