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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/security_interstitials/content/common_name_mismatch_handler.h"
#include <utility>
#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/strings/string_number_conversions.h"
#include "components/ssl_errors/error_classification.h"
#include "net/base/load_flags.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_util.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "net/url_request/redirect_info.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "services/network/public/cpp/simple_url_loader.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
CommonNameMismatchHandler::CommonNameMismatchHandler(
const GURL& request_url,
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory)
: request_url_(request_url),
url_loader_factory_(std::move(url_loader_factory)) {}
CommonNameMismatchHandler::~CommonNameMismatchHandler() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
// static
CommonNameMismatchHandler::TestingState
CommonNameMismatchHandler::testing_state_ = NOT_TESTING;
void CommonNameMismatchHandler::CheckSuggestedUrl(const GURL& url,
CheckUrlCallback callback) {
// Should be used only in tests.
if (testing_state_ == IGNORE_REQUESTS_FOR_TESTING)
return;
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!IsCheckingSuggestedUrl());
DCHECK(check_url_callback_.is_null());
check_url_ = url;
check_url_callback_ = std::move(callback);
// Create traffic annotation tag.
net::NetworkTrafficAnnotationTag traffic_annotation =
net::DefineNetworkTrafficAnnotation("ssl_name_mismatch_lookup", R"(
semantics {
sender: "SSL Name Mismatch Handler"
description:
"If Chromium cannot make a secure connection to a site, this can "
"be because the site is misconfigured. The site may be serving a "
"security certificate intended for another site. If the SSL Common "
"Name Mismatch Handling feature is enabled, Chromium will try to "
"detect if one of the domains listed in the site's certificate is "
"available by issuing requests to those domains. If the response "
"indicates that an alternative site for which the certificate is "
"valid is available, Chromium will automatically redirect the user "
"to the alternative site."
trigger: "Resource load."
data: "An HTTP HEAD request to the alternative site."
destination: WEBSITE
}
policy {
cookies_allowed: NO
setting:
"Users can disable this feature by command line flag "
"'--disable-feature=SSLCommonNameMismatchHandling'."
policy_exception_justification:
"Not implemented."
})");
auto resource_request = std::make_unique<network::ResourceRequest>();
// Can't safely use net::LOAD_DISABLE_CERT_NETWORK_FETCHES here,
// since then the connection may be reused without checking the cert.
resource_request->url = check_url_;
resource_request->method = "HEAD";
resource_request->credentials_mode = network::mojom::CredentialsMode::kOmit;
simple_url_loader_ = network::SimpleURLLoader::Create(
std::move(resource_request), traffic_annotation);
// Don't follow redirects to prevent leaking URL data to HTTP sites.
simple_url_loader_->SetOnRedirectCallback(
base::BindRepeating(&CommonNameMismatchHandler::OnSimpleLoaderRedirect,
base::Unretained(this)));
simple_url_loader_->SetOnResponseStartedCallback(
base::BindOnce(&CommonNameMismatchHandler::OnSimpleLoaderResponseStarted,
base::Unretained(this)));
simple_url_loader_->DownloadToString(
url_loader_factory_.get(),
base::BindOnce(&CommonNameMismatchHandler::OnSimpleLoaderComplete,
base::Unretained(this)),
1 /*max_body_size*/);
}
// static
bool CommonNameMismatchHandler::GetSuggestedUrl(
const GURL& request_url,
const std::vector<std::string>& dns_names,
GURL* suggested_url) {
std::string www_mismatch_hostname;
if (!ssl_errors::GetWWWSubDomainMatch(request_url, dns_names,
&www_mismatch_hostname)) {
return false;
}
// The full URL should be pinged, not just the new hostname. So, get the
// |suggested_url| with the |request_url|'s hostname replaced with
// new hostname. Keep resource path, query params the same.
GURL::Replacements replacements;
replacements.SetHostStr(www_mismatch_hostname);
*suggested_url = request_url.ReplaceComponents(replacements);
return true;
}
void CommonNameMismatchHandler::Cancel() {
simple_url_loader_.reset();
check_url_callback_.Reset();
}
void CommonNameMismatchHandler::OnSimpleLoaderHandler(
const GURL& final_url,
const network::mojom::URLResponseHead* head) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(IsCheckingSuggestedUrl());
DCHECK(!check_url_callback_.is_null());
SuggestedUrlCheckResult result = SUGGESTED_URL_NOT_AVAILABLE;
// Make sure the URL is a HTTPS page and returns a proper response code.
int response_code = -1;
// head may be null here, if called from OnSimpleLoaderComplete.
if (head && head->headers) {
response_code = head->headers->response_code();
}
if (response_code == 200 && final_url.SchemeIsCryptographic() &&
final_url.host() != request_url_.host()) {
DCHECK_EQ(final_url.host(), final_url.host());
result = SUGGESTED_URL_AVAILABLE;
}
simple_url_loader_.reset();
std::move(check_url_callback_).Run(result, check_url_);
}
void CommonNameMismatchHandler::OnSimpleLoaderRedirect(
const GURL& url_before_redirect,
const net::RedirectInfo& redirect_info,
const network::mojom::URLResponseHead& response_head,
std::vector<std::string>* to_be_removed_headers) {
OnSimpleLoaderHandler(redirect_info.new_url, &response_head);
}
void CommonNameMismatchHandler::OnSimpleLoaderResponseStarted(
const GURL& final_url,
const network::mojom::URLResponseHead& response_head) {
OnSimpleLoaderHandler(final_url, &response_head);
}
void CommonNameMismatchHandler::OnSimpleLoaderComplete(
std::unique_ptr<std::string> response_body) {
OnSimpleLoaderHandler(simple_url_loader_->GetFinalURL(),
simple_url_loader_->ResponseInfo());
}
bool CommonNameMismatchHandler::IsCheckingSuggestedUrl() const {
return !!simple_url_loader_;
}
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