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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "services/network/websocket_factory.h"
#include "base/functional/bind.h"
#include "mojo/public/cpp/bindings/message.h"
#include "net/base/isolation_info.h"
#include "net/base/url_util.h"
#include "net/storage_access_api/status.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "services/network/network_context.h"
#include "services/network/network_service.h"
#include "services/network/public/mojom/network_context.mojom.h"
#include "services/network/websocket.h"
#include "url/origin.h"
#include "url/url_constants.h"
namespace network {
namespace {
bool IsValidSubprotocolCharacter(char character) {
constexpr auto kMinimumProtocolCharacter = '!'; // U+0021.
constexpr auto kMaximumProtocolCharacter = '~'; // U+007E.
// Set to true if character does not matches "separators" ABNF defined in
// RFC2616. SP and HT are excluded since the range check excludes them.
const bool is_separator =
character == '"' || character == '(' || character == ')' ||
character == ',' || character == '/' ||
(character >= ':' &&
character <=
'@') // U+003A - U+0040 (':', ';', '<', '=', '>', '?', '@').
|| (character >= '[' &&
character <= ']') // U+005B - U+005D ('[', '\\', ']').
|| character == '{' || character == '}';
return character >= kMinimumProtocolCharacter &&
character <= kMaximumProtocolCharacter && !is_separator;
}
bool IsValidSubprotocolString(const std::string& protocol) {
if (protocol.empty()) {
return false;
}
return std::ranges::all_of(protocol, IsValidSubprotocolCharacter);
}
bool IsValidProtocols(const std::vector<std::string>& requested_protocols) {
// Fail if not all elements in |protocols| are valid.
if (!std::ranges::all_of(requested_protocols, IsValidSubprotocolString)) {
return false;
}
// Fail if there're duplicated elements in |protocols|.
std::vector<std::string> protocols = requested_protocols;
std::ranges::sort(protocols);
if (std::ranges::adjacent_find(protocols) != protocols.end()) {
return false;
}
return true;
}
} // namespace
WebSocketFactory::WebSocketFactory(NetworkContext* context)
: context_(context) {}
WebSocketFactory::~WebSocketFactory() {
// Subtle: This is important to avoid WebSocketFactory::Remove calls during
// `connections_` destruction.
WebSocketSet connections = std::move(connections_);
}
void WebSocketFactory::CreateWebSocket(
const GURL& url,
const std::vector<std::string>& requested_protocols,
const net::SiteForCookies& site_for_cookies,
net::StorageAccessApiStatus storage_access_api_status,
const net::IsolationInfo& isolation_info,
std::vector<mojom::HttpHeaderPtr> additional_headers,
int32_t process_id,
const url::Origin& origin,
network::mojom::ClientSecurityStatePtr client_security_state,
uint32_t options,
net::NetworkTrafficAnnotationTag traffic_annotation,
mojo::PendingRemote<mojom::WebSocketHandshakeClient> handshake_client,
mojo::PendingRemote<mojom::URLLoaderNetworkServiceObserver>
url_loader_network_observer,
mojo::PendingRemote<mojom::WebSocketAuthenticationHandler> auth_handler,
mojo::PendingRemote<mojom::TrustedHeaderClient> header_client,
const std::optional<base::UnguessableToken>& throttling_profile_id) {
if (isolation_info.request_type() !=
net::IsolationInfo::RequestType::kOther) {
mojo::ReportBadMessage(
"WebSocket's IsolationInfo::RequestType must be kOther");
return;
}
if (!url.SchemeIsWSOrWSS()) {
mojo::ReportBadMessage("Invalid scheme.");
return;
}
if (!IsValidProtocols(requested_protocols)) {
mojo::ReportBadMessage("Invalid protocols.");
return;
}
// If `require_network_anonymization_key` is set, `isolation_info` must not be
// empty.
if (context_->require_network_anonymization_key()) {
DCHECK(!isolation_info.IsEmpty());
}
if (throttler_.HasTooManyPendingConnections(process_id)) {
// Too many websockets!
mojo::Remote<mojom::WebSocketHandshakeClient> handshake_client_remote(
std::move(handshake_client));
handshake_client_remote->OnFailure("Insufficient resources",
net::ERR_INSUFFICIENT_RESOURCES, -1);
handshake_client_remote.reset();
return;
}
if (isolation_info.nonce().has_value() &&
!context_->IsNetworkForNonceAndUrlAllowed(*isolation_info.nonce(), url)) {
mojo::Remote<mojom::WebSocketHandshakeClient> handshake_client_remote(
std::move(handshake_client));
handshake_client_remote->OnFailure("Network access revoked",
net::ERR_NETWORK_ACCESS_REVOKED, -1);
handshake_client_remote.reset();
return;
}
WebSocket::HasRawHeadersAccess has_raw_headers_access(
context_->network_service()->HasRawHeadersAccess(
process_id, net::ChangeWebSocketSchemeToHttpScheme(url)));
connections_.insert(std::make_unique<WebSocket>(
this, url, requested_protocols, site_for_cookies,
storage_access_api_status, isolation_info, std::move(additional_headers),
origin, std::move(client_security_state), options, traffic_annotation,
has_raw_headers_access, std::move(handshake_client),
std::move(url_loader_network_observer), std::move(auth_handler),
std::move(header_client),
throttler_.IssuePendingConnectionTracker(process_id),
throttler_.CalculateDelay(process_id), throttling_profile_id));
}
net::URLRequestContext* WebSocketFactory::GetURLRequestContext() {
return context_->url_request_context();
}
void WebSocketFactory::Remove(WebSocket* impl) {
auto it = connections_.find(impl);
if (it == connections_.end()) {
// This is possible when this function is called inside the WebSocket
// destructor.
return;
}
connections_.erase(it);
}
void WebSocketFactory::RemoveIfNonceMatches(
const base::UnguessableToken& nonce) {
std::erase_if(connections_, [&nonce](const auto& connection) {
return connection->RevokeIfNonceMatches(nonce);
});
}
} // namespace network
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