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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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22
components/script/dom/servoparser/mod.rs
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@ -21,6 +21,7 @@ use html5ever::{Attribute, ExpandedName, LocalName, QualName, local_name, ns};
use hyper_serde::Serde;
use markup5ever::TokenizerResult;
use mime::{self, Mime};
use net_traits::policy_container::PolicyContainer;
use net_traits::request::RequestId;
use net_traits::{
FetchMetadata, FetchResponseListener, Metadata, NetworkError, ResourceFetchTiming,
@ -813,6 +814,27 @@ impl ParserContext {
pushed_entry_index: None,
}
}
pub(crate) fn append_parent_to_csp_list(&self, policy_container: Option<&PolicyContainer>) {
let Some(policy_container) = policy_container else {
return;
};
let Some(parent_csp_list) = &policy_container.csp_list else {
return;
};
let Some(parser) = self.parser.as_ref().map(|p| p.root()) else {
return;
};
let new_csp_list = match parser.document.get_csp_list() {
None => parent_csp_list.clone(),
Some(original_csp_list) => {
let mut appended_csp_list = original_csp_list.clone();
appended_csp_list.append(parent_csp_list.clone());
appended_csp_list.to_owned()
},
};
parser.document.set_csp_list(Some(new_csp_list));
}
}
impl FetchResponseListener for ParserContext {