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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/net/network_diagnostics/tls_prober.h"
#include <optional>
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/task/task_runner.h"
#include "chrome/browser/ash/net/network_diagnostics/network_diagnostics_util.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "net/base/address_list.h"
#include "net/base/host_port_pair.h"
#include "net/base/net_errors.h"
#include "services/network/public/cpp/resolve_host_client_base.h"
#include "services/network/public/cpp/simple_host_resolver.h"
namespace ash::network_diagnostics {
namespace {
net::NetworkTrafficAnnotationTag GetTrafficAnnotationTag() {
return net::DefineNetworkTrafficAnnotation("network_diagnostics_tls",
R"(
semantics {
sender: "NetworkDiagnosticsRoutines"
description:
"Routines send network traffic to hosts in order to "
"validate the internet connection on a device."
trigger:
"A routine attempts a socket connection or makes an http/s "
"request."
data:
"No data other than the origin (scheme-host-port) is sent. "
"No user identifier is sent along with the data."
destination: GOOGLE_OWNED_SERVICE
}
policy {
cookies_allowed: NO
policy_exception_justification:
"Not implemented. Does not contain user identifier."
}
)");
}
} // namespace
TlsProber::TlsProber(network::NetworkContextGetter network_context_getter,
net::HostPortPair host_port_pair,
bool negotiate_tls,
TlsProbeCompleteCallback callback)
: network_context_getter_(std::move(network_context_getter)),
host_port_pair_(std::move(host_port_pair)),
negotiate_tls_(negotiate_tls),
callback_(std::move(callback)) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(callback_);
DCHECK(!host_port_pair_.IsEmpty());
network::mojom::NetworkContext* network_context =
network_context_getter_.Run();
DCHECK(network_context);
host_resolver_ = network::SimpleHostResolver::Create(network_context);
// Resolver host parameter source must be unset or set to ANY in order for DNS
// queries with BuiltInDnsClientEnabled policy disabled to work (b/353448388).
network::mojom::ResolveHostParametersPtr parameters =
network::mojom::ResolveHostParameters::New();
parameters->dns_query_type = net::DnsQueryType::A;
parameters->cache_usage =
network::mojom::ResolveHostParameters::CacheUsage::DISALLOWED;
// Unretained(this) is safe here because the callback is invoked directly by
// |host_resolver_| which is owned by |this|.
host_resolver_->ResolveHost(
network::mojom::HostResolverHost::NewHostPortPair(host_port_pair_),
net::NetworkAnonymizationKey::CreateTransient(), std::move(parameters),
base::BindOnce(&TlsProber::OnHostResolutionComplete,
base::Unretained(this)));
}
TlsProber::TlsProber()
: network_context_getter_(base::NullCallback()), negotiate_tls_(false) {}
TlsProber::~TlsProber() = default;
void TlsProber::OnHostResolutionComplete(
int result,
const net::ResolveErrorInfo&,
const std::optional<net::AddressList>& resolved_addresses,
const std::optional<net::HostResolverEndpointResults>&) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
host_resolver_.reset();
if (result != net::OK) {
CHECK(!resolved_addresses);
OnDone(result, ProbeExitEnum::kDnsFailure);
return;
}
CHECK(resolved_addresses);
network::mojom::NetworkContext::CreateTCPConnectedSocketCallback
completion_callback = base::BindOnce(&TlsProber::OnConnectComplete,
weak_factory_.GetWeakPtr());
auto pending_receiver =
tcp_connected_socket_remote_.BindNewPipeAndPassReceiver();
// Add a disconnect handler to the TCPConnectedSocket remote.
tcp_connected_socket_remote_.set_disconnect_handler(
base::BindOnce(&TlsProber::OnDisconnect, weak_factory_.GetWeakPtr()));
network::mojom::NetworkContext* network_context =
network_context_getter_.Run();
CHECK(network_context);
network_context->CreateTCPConnectedSocket(
/*local_addr=*/std::nullopt, resolved_addresses.value(),
/*tcp_connected_socket_options=*/nullptr,
net::MutableNetworkTrafficAnnotationTag(GetTrafficAnnotationTag()),
std::move(pending_receiver), /*observer=*/mojo::NullRemote(),
std::move(completion_callback));
}
void TlsProber::OnConnectComplete(
int result,
const std::optional<net::IPEndPoint>& local_addr,
const std::optional<net::IPEndPoint>& peer_addr,
mojo::ScopedDataPipeConsumerHandle receive_stream,
mojo::ScopedDataPipeProducerHandle send_stream) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(tcp_connected_socket_remote_.is_bound());
if (result != net::OK) {
OnDone(result, ProbeExitEnum::kTcpConnectionFailure);
return;
}
if (!negotiate_tls_) {
OnDone(result, ProbeExitEnum::kSuccess);
return;
}
DCHECK(peer_addr.has_value());
auto pending_receiver =
tls_client_socket_remote_.BindNewPipeAndPassReceiver();
// Remove the disconnect handler on |tcp_connected_socket_remote_|, which is
// disconnected from its receiver when it's upgraded to a TLSClientSocket
// remote.
tcp_connected_socket_remote_.set_disconnect_handler(base::NullCallback());
// Add a disconnect handler to the TLSClientSocket remote.
tls_client_socket_remote_.set_disconnect_handler(
base::BindOnce(&TlsProber::OnDisconnect, weak_factory_.GetWeakPtr()));
tcp_connected_socket_remote_->UpgradeToTLS(
host_port_pair_,
/*options=*/nullptr,
net::MutableNetworkTrafficAnnotationTag(GetTrafficAnnotationTag()),
std::move(pending_receiver),
/*observer=*/mojo::NullRemote(),
base::BindOnce(&TlsProber::OnTlsUpgrade, weak_factory_.GetWeakPtr()));
}
void TlsProber::OnTlsUpgrade(int result,
mojo::ScopedDataPipeConsumerHandle receive_stream,
mojo::ScopedDataPipeProducerHandle send_stream,
const std::optional<net::SSLInfo>& ssl_info) {
// |send_stream| and |receive_stream|, created on the TLS connection, fall out
// of scope when this method completes.
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
if (result == net::OK) {
OnDone(result, ProbeExitEnum::kSuccess);
return;
}
OnDone(result, ProbeExitEnum::kTlsUpgradeFailure);
}
void TlsProber::OnDisconnect() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
OnDone(net::ERR_FAILED, ProbeExitEnum::kMojoDisconnectFailure);
}
void TlsProber::OnDone(int result, ProbeExitEnum probe_exit_enum) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// Invalidate pending callbacks.
weak_factory_.InvalidateWeakPtrs();
// Destroy the socket connection.
tcp_connected_socket_remote_.reset();
tls_client_socket_remote_.reset();
std::move(callback_).Run(result, probe_exit_enum);
}
} // namespace ash::network_diagnostics
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