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Cleanup blocking fetch operations with bad ports (#35324)

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Blocking a fetch due to a bad port should be grouped together
with CSP blocks as per the spec, but these steps were previously
seperated.

Additionally, remove handling of ftp in
should_request_be_blocked_due_to_a_bad_port, since it did nothing
anyways.

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
This commit is contained in:
Simon Wülker 2025-02-06 17:47:29 +01:00 • committed by GitHub
parent 18b43d48fc
commit 0ebdf146fc
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2 changed files with 21 additions and 42 deletions
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59
components/net/fetch/methods.rs
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@ -240,14 +240,6 @@ pub async fn main_fetch(
RequestPolicyContainer::PolicyContainer(container) => container.to_owned(),
};
// Step 2.4.
if should_request_be_blocked_by_csp(request, &policy_container) == csp::CheckResult::Blocked {
warn!("Request blocked by CSP");
response = Some(Response::network_error(NetworkError::Internal(
"Blocked by Content-Security-Policy".into(),
)))
}
// Step 3.
// TODO: handle request abort.
@ -278,14 +270,21 @@ pub async fn main_fetch(
);
}
// Step 5.
if should_be_blocked_due_to_bad_port(&request.current_url()) {
// Step 7. If should request be blocked due to a bad port, should fetching request be blocked
// as mixed content, or should request be blocked by Content Security Policy returns blocked,
// then set response to a network error.
// TODO: check "should fetching request be blocked as mixed content"
if should_request_be_blocked_by_csp(request, &policy_container) == csp::CheckResult::Blocked {
warn!("Request blocked by CSP");
response = Some(Response::network_error(NetworkError::Internal(
"Blocked by Content-Security-Policy".into(),
)))
}
if should_request_be_blocked_due_to_a_bad_port(&request.current_url()) {
response = Some(Response::network_error(NetworkError::Internal(
"Request attempted on bad port".into(),
)));
}
// TODO: handle blocking as mixed content.
// TODO: handle blocking by content security policy.
// Step 8: If request’s referrer policy is the empty string, then set request’s referrer policy
// to request’s policy container’s referrer policy.
@ -858,41 +857,21 @@ fn should_be_blocked_due_to_mime_type(
}
/// <https://fetch.spec.whatwg.org/#block-bad-port>
pub fn should_be_blocked_due_to_bad_port(url: &ServoUrl) -> bool {
// Step 1 is not applicable, this function just takes the URL directly.
pub fn should_request_be_blocked_due_to_a_bad_port(url: &ServoUrl) -> bool {
// Step 1. Let url be request’s current URL.
// NOTE: We receive the request url as an argument
// Step 2.
let scheme = url.scheme();
// Step 3.
// If there is no explicit port, this means the default one is used for
// the given scheme, and thus this means the request should not be blocked
// due to a bad port.
let port = if let Some(port) = url.port() {
port
} else {
return false;
};
// Step 4.
if scheme == "ftp" && (port == 20 || port == 21) {
return false;
}
// Step 5.
if is_network_scheme(scheme) && is_bad_port(port) {
// Step 2. If url’s scheme is an HTTP(S) scheme and url’s port is a bad port, then return blocked.
let is_http_scheme = matches!(url.scheme(), "http" | "https");
let is_bad_port = url.port().is_some_and(is_bad_port);
if is_http_scheme && is_bad_port {
return true;
}
// Step 6.
// Step 3. Return allowed.
false
}
/// <https://fetch.spec.whatwg.org/#network-scheme>
fn is_network_scheme(scheme: &str) -> bool {
scheme == "ftp" || scheme == "http" || scheme == "https"
}
/// <https://fetch.spec.whatwg.org/#bad-port>
fn is_bad_port(port: u16) -> bool {
static BAD_PORTS: [u16; 78] = [