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content / browser / webid / federated_provider_fetcher.cc [blame]
// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/webid/federated_provider_fetcher.h"
#include "base/check.h"
#include "content/browser/webid/flags.h"
#include "content/browser/webid/webid_utils.h"
namespace content {
namespace {
// Maximum number of provider URLs in the well-known file.
// TODO(cbiesinger): Determine what the right number is.
static constexpr size_t kMaxProvidersInWellKnownFile = 1ul;
void SetError(FederatedProviderFetcher::FetchResult& fetch_result,
blink::mojom::FederatedAuthRequestResult result,
content::FedCmRequestIdTokenStatus token_status,
std::optional<std::string> additional_console_error_message) {
fetch_result.error = FederatedProviderFetcher::FetchError(
result, token_status, additional_console_error_message);
}
} // namespace
using blink::mojom::FederatedAuthRequestResult;
using TokenStatus = FedCmRequestIdTokenStatus;
FederatedProviderFetcher::FetchError::FetchError(const FetchError&) = default;
FederatedProviderFetcher::FetchError::FetchError(
blink::mojom::FederatedAuthRequestResult result,
FedCmRequestIdTokenStatus token_status,
std::optional<std::string> additional_console_error_message)
: result(result),
token_status(token_status),
additional_console_error_message(
std::move(additional_console_error_message)) {}
FederatedProviderFetcher::FetchError::~FetchError() = default;
FederatedProviderFetcher::FetchResult::FetchResult() = default;
FederatedProviderFetcher::FetchResult::FetchResult(const FetchResult&) =
default;
FederatedProviderFetcher::FetchResult::~FetchResult() = default;
FederatedProviderFetcher::FederatedProviderFetcher(
RenderFrameHost& render_frame_host,
IdpNetworkRequestManager* network_manager)
: render_frame_host_(render_frame_host),
network_manager_(network_manager) {}
FederatedProviderFetcher::~FederatedProviderFetcher() = default;
void FederatedProviderFetcher::Start(
const std::set<GURL>& identity_provider_config_urls,
blink::mojom::RpMode rp_mode,
int icon_ideal_size,
int icon_minimum_size,
RequesterCallback callback) {
callback_ = std::move(callback);
for (const GURL& identity_provider_config_url :
identity_provider_config_urls) {
FetchResult fetch_result;
fetch_result.identity_provider_config_url = identity_provider_config_url;
fetch_results_.push_back(std::move(fetch_result));
pending_well_known_fetches_.insert(identity_provider_config_url);
pending_config_fetches_.insert(identity_provider_config_url);
}
// In a separate loop to avoid invalidating references when adding elements to
// `fetch_results_`.
for (FetchResult& fetch_result : fetch_results_) {
network_manager_->FetchWellKnown(
fetch_result.identity_provider_config_url,
base::BindOnce(&FederatedProviderFetcher::OnWellKnownFetched,
weak_ptr_factory_.GetWeakPtr(), std::ref(fetch_result)));
network_manager_->FetchConfig(
fetch_result.identity_provider_config_url, rp_mode, icon_ideal_size,
icon_minimum_size,
base::BindOnce(&FederatedProviderFetcher::OnConfigFetched,
weak_ptr_factory_.GetWeakPtr(), std::ref(fetch_result)));
}
}
void FederatedProviderFetcher::OnWellKnownFetched(
FetchResult& fetch_result,
IdpNetworkRequestManager::FetchStatus status,
const IdpNetworkRequestManager::WellKnown& well_known) {
pending_well_known_fetches_.erase(fetch_result.identity_provider_config_url);
constexpr char kWellKnownFileStr[] = "well-known file";
if (status.parse_status != IdpNetworkRequestManager::ParseStatus::kSuccess &&
!ShouldSkipWellKnownEnforcementForIdp(
fetch_result.identity_provider_config_url)) {
std::optional<std::string> additional_console_error_message =
webid::ComputeConsoleMessageForHttpResponseCode(kWellKnownFileStr,
status.response_code);
switch (status.parse_status) {
case IdpNetworkRequestManager::ParseStatus::kHttpNotFoundError: {
OnError(fetch_result,
FederatedAuthRequestResult::kWellKnownHttpNotFound,
TokenStatus::kWellKnownHttpNotFound,
additional_console_error_message);
return;
}
case IdpNetworkRequestManager::ParseStatus::kNoResponseError: {
OnError(fetch_result, FederatedAuthRequestResult::kWellKnownNoResponse,
TokenStatus::kWellKnownNoResponse,
additional_console_error_message);
return;
}
case IdpNetworkRequestManager::ParseStatus::kInvalidResponseError: {
OnError(fetch_result,
FederatedAuthRequestResult::kWellKnownInvalidResponse,
TokenStatus::kWellKnownInvalidResponse,
additional_console_error_message);
return;
}
case IdpNetworkRequestManager::ParseStatus::kEmptyListError: {
OnError(fetch_result, FederatedAuthRequestResult::kWellKnownListEmpty,
TokenStatus::kWellKnownListEmpty,
additional_console_error_message);
return;
}
case IdpNetworkRequestManager::ParseStatus::kInvalidContentTypeError: {
OnError(fetch_result,
FederatedAuthRequestResult::kWellKnownInvalidContentType,
TokenStatus::kWellKnownInvalidContentType,
additional_console_error_message);
return;
}
case IdpNetworkRequestManager::ParseStatus::kSuccess: {
NOTREACHED_IN_MIGRATION();
}
}
}
fetch_result.wellknown = std::move(well_known);
RunCallbackIfDone();
}
void FederatedProviderFetcher::OnConfigFetched(
FetchResult& fetch_result,
IdpNetworkRequestManager::FetchStatus status,
IdpNetworkRequestManager::Endpoints endpoints,
IdentityProviderMetadata idp_metadata) {
pending_config_fetches_.erase(fetch_result.identity_provider_config_url);
constexpr char kConfigFileStr[] = "config file";
if (status.parse_status != IdpNetworkRequestManager::ParseStatus::kSuccess) {
std::optional<std::string> additional_console_error_message =
webid::ComputeConsoleMessageForHttpResponseCode(kConfigFileStr,
status.response_code);
switch (status.parse_status) {
case IdpNetworkRequestManager::ParseStatus::kHttpNotFoundError: {
OnError(fetch_result, FederatedAuthRequestResult::kConfigHttpNotFound,
TokenStatus::kConfigHttpNotFound,
additional_console_error_message);
return;
}
case IdpNetworkRequestManager::ParseStatus::kNoResponseError: {
OnError(fetch_result, FederatedAuthRequestResult::kConfigNoResponse,
TokenStatus::kConfigNoResponse,
additional_console_error_message);
return;
}
case IdpNetworkRequestManager::ParseStatus::kInvalidResponseError: {
OnError(fetch_result,
FederatedAuthRequestResult::kConfigInvalidResponse,
TokenStatus::kConfigInvalidResponse,
additional_console_error_message);
return;
}
case IdpNetworkRequestManager::ParseStatus::kInvalidContentTypeError: {
OnError(fetch_result,
FederatedAuthRequestResult::kConfigInvalidContentType,
TokenStatus::kConfigInvalidContentType,
additional_console_error_message);
return;
}
case IdpNetworkRequestManager::ParseStatus::kEmptyListError: {
NOTREACHED_IN_MIGRATION()
<< "kEmptyListError is undefined for OnConfigFetched";
return;
}
case IdpNetworkRequestManager::ParseStatus::kSuccess: {
NOTREACHED_IN_MIGRATION();
}
}
}
fetch_result.endpoints = endpoints;
fetch_result.metadata = idp_metadata;
RunCallbackIfDone();
}
void FederatedProviderFetcher::OnError(
FetchResult& fetch_result,
blink::mojom::FederatedAuthRequestResult result,
content::FedCmRequestIdTokenStatus token_status,
std::optional<std::string> additional_console_error_message) {
SetError(fetch_result, result, token_status,
additional_console_error_message);
RunCallbackIfDone();
}
void FederatedProviderFetcher::ValidateAndMaybeSetError(FetchResult& result) {
// This function validates fetch results, by analyzing the config file and
// the well-known file.
// If the validation fails, this function sets the "error" property in the
// result.
if (result.error) {
// A fetch error was already recorded earlier (e.g. a network error).
return;
}
// Validates the config file. A valid config file must have:
//
// (a) a token endpoint same-origin url
// (b) an accounts endpoint same-origin url
// (c) optionally, a login_url same-origin url
//
// If one of these conditions are not met (e.g. one of the urls are not
// valid), we consider the config file invalid.
bool is_token_valid = webid::IsEndpointSameOrigin(
result.identity_provider_config_url, result.endpoints.token);
bool is_accounts_valid = webid::IsEndpointSameOrigin(
result.identity_provider_config_url, result.endpoints.accounts);
url::Origin idp_origin =
url::Origin::Create(result.identity_provider_config_url);
bool is_login_url_valid =
webid::GetIdpSigninStatusMode(render_frame_host_.get(), idp_origin) !=
FedCmIdpSigninStatusMode::ENABLED ||
(result.metadata &&
webid::IsEndpointSameOrigin(result.identity_provider_config_url,
result.metadata->idp_login_url));
if (!is_token_valid || !is_accounts_valid || !is_login_url_valid) {
std::string console_message =
"Config file is missing or has an invalid URL for the following:\n";
if (!is_token_valid) {
console_message += "\"id_assertion_endpoint\"\n";
}
if (!is_accounts_valid) {
console_message += "\"accounts_endpoint\"\n";
}
if (!is_login_url_valid) {
console_message += "\"login_url\"\n";
}
SetError(result, FederatedAuthRequestResult::kConfigInvalidResponse,
TokenStatus::kConfigInvalidResponse, console_message);
return;
}
// Validates the well-known file.
// A well-known is valid if:
//
// (a) a chrome://flag has been set to bypass the check or
// (b) the well-known has an accounts_endpoint/login_url attribute that
// match the one in the config file or
// (c) the well-known file has a providers_url list of size 1 and that
// contains the config url passed in the JS call
// (a)
if (ShouldSkipWellKnownEnforcementForIdp(
result.identity_provider_config_url)) {
return;
}
// (b)
if (webid::IsFedCmAuthzEnabled(*render_frame_host_, idp_origin) &&
result.wellknown.accounts.is_valid() &&
result.wellknown.login_url.is_valid() && result.metadata &&
result.metadata->idp_login_url.is_valid()) {
// Behind the AuthZ flag, it is valid for IdPs to have valid configURLs
// by announcing their accounts_endpoint and their login_urls in the
// .well-known file. When that happens, and both of these urls match the
// contents of their configURLs, the browser knows that they don't
// contain any extra data embedded in them, so they can used as a valid
// configURL without checking for its presence in the provider_urls array.
if (result.endpoints.accounts != result.wellknown.accounts ||
result.metadata->idp_login_url != result.wellknown.login_url) {
SetError(result, FederatedAuthRequestResult::kConfigInvalidResponse,
TokenStatus::kConfigInvalidResponse,
"The well-known file contains an accounts endpoint or login_url "
"that doesn't match the one in the configURL");
}
return;
}
// (c)
//
// The config url from the API call:
// navigator.credentials.get({
// federated: {
// providers: [{
// configURL: "https://foo.idp.example/fedcm.json",
// clientId: "1234"
// }],
// }
// });
//
// must match the one in the well-known file:
//
// {
// "provider_urls": [
// "https://foo.idp.example/fedcm.json"
// ]
// }
if (result.wellknown.provider_urls.size() > kMaxProvidersInWellKnownFile) {
SetError(result, FederatedAuthRequestResult::kWellKnownTooBig,
TokenStatus::kWellKnownTooBig,
/*additional_console_error_message=*/std::nullopt);
return;
}
bool provider_url_is_valid = (result.wellknown.provider_urls.count(
result.identity_provider_config_url) != 0);
if (!provider_url_is_valid) {
SetError(result, FederatedAuthRequestResult::kConfigNotInWellKnown,
TokenStatus::kConfigNotInWellKnown,
/*additional_console_error_message=*/std::nullopt);
return;
}
}
void FederatedProviderFetcher::RunCallbackIfDone() {
if (!pending_config_fetches_.empty() ||
!pending_well_known_fetches_.empty()) {
return;
}
for (auto& result : fetch_results_) {
ValidateAndMaybeSetError(result);
}
std::move(callback_).Run(std::move(fetch_results_));
}
bool FederatedProviderFetcher::ShouldSkipWellKnownEnforcementForIdp(
const GURL& idp_url) {
if (IsFedCmWithoutWellKnownEnforcementEnabled()) {
return true;
}
// Skip if RP and IDP are same-site.
return webid::IsSameSite(render_frame_host_->GetLastCommittedOrigin(),
url::Origin::Create(idp_url));
}
} // namespace content