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Fix Sec-Fetch-Site header (#37277)

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While working on #37209 I discovered that the header was computed
incorrectly. After carefully reading the specification, I realized that
the link in the spec was wrong and we were missing the fact that for
host-domains, we should operate on the registrable domain.

Additionally, the same-site call was missing the negation.

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>
This commit is contained in:
Tim van der Lippe 2025-06-07 18:57:29 +02:00 • committed by GitHub
parent a625420b23
commit c808ff7666
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36 changed files with 41 additions and 444 deletions
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16
components/net/http_loader.rs
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@ -59,7 +59,7 @@ use net_traits::{
use profile_traits::mem::{Report, ReportKind};
use profile_traits::path;
use servo_arc::Arc;
use servo_url::{ImmutableOrigin, ServoUrl};
use servo_url::{Host, ImmutableOrigin, ServoUrl};
use tokio::sync::mpsc::{
Receiver as TokioReceiver, Sender as TokioSender, UnboundedReceiver, UnboundedSender, channel,
unbounded_channel,
@ -223,8 +223,11 @@ fn strict_origin_when_cross_origin(
strip_url_for_use_as_referrer(referrer_url, true)
}
/// <https://html.spec.whatwg.org/multipage/#concept-site-same-site>
/// <https://html.spec.whatwg.org/multipage/#same-site>
fn is_same_site(site_a: &ImmutableOrigin, site_b: &ImmutableOrigin) -> bool {
// First steps are for
// https://html.spec.whatwg.org/multipage/#concept-site-same-site
//
// Step 1. If A and B are the same opaque origin, then return true.
if !site_a.is_tuple() && !site_b.is_tuple() && site_a == site_b {
return true;
@ -244,7 +247,12 @@ fn is_same_site(site_a: &ImmutableOrigin, site_b: &ImmutableOrigin) -> bool {
}
// Step 4. If A's and B's host values are not equal, then return false.
if host_a != host_b {
// Includes the steps of https://html.spec.whatwg.org/multipage/#obtain-a-site
if let (Host::Domain(domain_a), Host::Domain(domain_b)) = (host_a, host_b) {
if reg_suffix(domain_a) != reg_suffix(domain_b) {
return false;
}
} else if host_a != host_b {
return false;
}
@ -2564,7 +2572,7 @@ fn set_the_sec_fetch_site_header(r: &mut Request) {
header = SecFetchSite::CrossSite;
// Step 5.3 If r’s origin is not same site with url’s origin, then break.
if is_same_site(request_origin, &url.origin()) {
if !is_same_site(request_origin, &url.origin()) {
break;
}