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// Copyright 2024 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/ip_protection/android/ip_protection_token_ipc_fetcher.h"
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include "base/check.h"
#include "base/sequence_checker.h"
#include "base/task/bind_post_task.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "components/ip_protection/android/blind_sign_message_android_impl.h"
#include "components/ip_protection/common/ip_protection_data_types.h"
#include "components/ip_protection/common/ip_protection_telemetry.h"
#include "components/ip_protection/common/ip_protection_token_fetcher_helper.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/features.h"
#include "net/third_party/quiche/src/quiche/blind_sign_auth/blind_sign_auth.h"
#include "net/third_party/quiche/src/quiche/blind_sign_auth/blind_sign_auth_interface.h"
#include "third_party/abseil-cpp/absl/status/statusor.h"
namespace ip_protection {
IpProtectionTokenIpcFetcher::IpProtectionTokenIpcFetcher(
Delegate* delegate,
std::unique_ptr<quiche::BlindSignAuthInterface> blind_sign_auth_for_testing)
: delegate_(delegate),
thread_pool_task_runner_(base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::TaskPriority::BEST_EFFORT,
base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN})),
helper_(thread_pool_task_runner_) {
blind_sign_message_android_impl_ =
std::make_unique<ip_protection::BlindSignMessageAndroidImpl>();
// TODO(b/360340499) : Remove `blind_sign_auth_for_testing` and implement mock
// fetcher for unit tests.
if (blind_sign_auth_for_testing) {
blind_sign_auth_ = std::move(blind_sign_auth_for_testing);
return;
}
privacy::ppn::BlindSignAuthOptions bsa_options{};
bsa_options.set_enable_privacy_pass(true);
blind_sign_auth_ = std::make_unique<quiche::BlindSignAuth>(
blind_sign_message_android_impl_.get(), std::move(bsa_options));
}
IpProtectionTokenIpcFetcher::~IpProtectionTokenIpcFetcher() = default;
void IpProtectionTokenIpcFetcher::TryGetAuthTokens(
uint32_t batch_size,
ProxyLayer proxy_layer,
TryGetAuthTokensCallback callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// If IP Protection is disabled then don't attempt to fetch tokens.
if (!delegate_->IsTokenFetchEnabled()) {
TryGetAuthTokensComplete(
/*bsa_tokens=*/std::nullopt, std::move(callback),
TryGetAuthTokensAndroidResult::kFailedDisabled);
return;
}
auto quiche_proxy_layer = proxy_layer == ProxyLayer::kProxyA
? quiche::ProxyLayer::kProxyA
: quiche::ProxyLayer::kProxyB;
auto bsa_get_tokens_start_time = base::TimeTicks::Now();
helper_.AsyncCall(&IpProtectionTokenFetcherHelper::GetTokensFromBlindSignAuth)
.WithArgs(
blind_sign_auth_.get(),
quiche::BlindSignAuthServiceType::kChromeIpBlinding, std::nullopt,
batch_size, quiche_proxy_layer,
base::BindPostTaskToCurrentDefault(base::BindOnce(
&IpProtectionTokenIpcFetcher::OnFetchBlindSignedTokenCompleted,
weak_ptr_factory_.GetWeakPtr(), bsa_get_tokens_start_time,
std::move(callback))));
}
void IpProtectionTokenIpcFetcher::OnFetchBlindSignedTokenCompleted(
base::TimeTicks bsa_get_tokens_start_time,
TryGetAuthTokensCallback callback,
absl::StatusOr<std::vector<quiche::BlindSignToken>> tokens) {
if (!tokens.ok()) {
TryGetAuthTokensAndroidResult result;
switch (tokens.status().code()) {
case absl::StatusCode::kUnavailable:
result = TryGetAuthTokensAndroidResult::kFailedBSATransient;
break;
case absl::StatusCode::kFailedPrecondition:
result = TryGetAuthTokensAndroidResult::kFailedBSAPersistent;
break;
default:
result = TryGetAuthTokensAndroidResult::kFailedBSAOther;
break;
}
TryGetAuthTokensComplete(/*bsa_tokens=*/std::nullopt, std::move(callback),
result);
return;
}
if (tokens.value().size() == 0) {
TryGetAuthTokensComplete(
/*bsa_tokens=*/std::nullopt, std::move(callback),
TryGetAuthTokensAndroidResult::kFailedBSAOther);
return;
}
std::optional<std::vector<ip_protection::BlindSignedAuthToken>> bsa_tokens =
IpProtectionTokenFetcherHelper::QuicheTokensToIpProtectionAuthTokens(
tokens.value());
if (!bsa_tokens) {
TryGetAuthTokensComplete(
/*bsa_tokens=*/std::nullopt, std::move(callback),
TryGetAuthTokensAndroidResult::kFailedBSAOther);
return;
}
const base::TimeTicks current_time = base::TimeTicks::Now();
TryGetAuthTokensComplete(std::move(bsa_tokens.value()), std::move(callback),
TryGetAuthTokensAndroidResult::kSuccess,
current_time - bsa_get_tokens_start_time);
}
void IpProtectionTokenIpcFetcher::TryGetAuthTokensComplete(
std::optional<std::vector<ip_protection::BlindSignedAuthToken>> bsa_tokens,
TryGetAuthTokensCallback callback,
ip_protection::TryGetAuthTokensAndroidResult result,
std::optional<base::TimeDelta> duration) {
if (result == TryGetAuthTokensAndroidResult::kSuccess) {
CHECK(bsa_tokens.has_value() && !bsa_tokens->empty());
}
ip_protection::Telemetry().AndroidTokenBatchFetchComplete(result, duration);
std::optional<base::TimeDelta> backoff = CalculateBackoff(result);
std::optional<base::Time> try_again_after;
if (backoff) {
if (*backoff == base::TimeDelta::Max()) {
try_again_after = base::Time::Max();
} else {
try_again_after = base::Time::Now() + *backoff;
}
}
DCHECK(bsa_tokens.has_value() || try_again_after.has_value());
std::move(callback).Run(std::move(bsa_tokens), try_again_after);
}
std::optional<base::TimeDelta> IpProtectionTokenIpcFetcher::CalculateBackoff(
TryGetAuthTokensAndroidResult result) {
std::optional<base::TimeDelta> backoff;
switch (result) {
case TryGetAuthTokensAndroidResult::kSuccess:
break;
case TryGetAuthTokensAndroidResult::kFailedBSAPersistent:
case TryGetAuthTokensAndroidResult::kFailedDisabled:
backoff = base::TimeDelta::Max();
break;
case TryGetAuthTokensAndroidResult::kFailedBSATransient:
case TryGetAuthTokensAndroidResult::kFailedBSAOther:
backoff = net::features::kIpPrivacyTryGetAuthTokensTransientBackoff.Get();
// Note that we calculate the backoff assuming that we've waited for
// `last_try_get_auth_tokens_backoff_` time already, but this may not be
// the case when:
// - Concurrent calls to `TryGetAuthTokens` from two network contexts are
// made and both fail in the same way
//
// - The network service restarts (the new network context(s) won't know
// to backoff until after the first request(s))
//
// We can't do much about the first case, but for the others we could
// track the backoff time here and not request tokens again until
// afterward.
if (last_try_get_auth_tokens_backoff_ &&
last_try_get_auth_tokens_result_ == result) {
backoff = *last_try_get_auth_tokens_backoff_ * 2;
}
break;
}
last_try_get_auth_tokens_result_ = result;
last_try_get_auth_tokens_backoff_ = backoff;
return backoff;
}
} // namespace ip_protection
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