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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 "remoting/protocol/session_authz_reauthorizer.h"
#include <memory>
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/strings/stringprintf.h"
#include "base/time/time.h"
#include "net/base/backoff_entry.h"
#include "remoting/base/logging.h"
#include "remoting/proto/session_authz_service.h"
#include "remoting/protocol/errors.h"
#include "remoting/protocol/session.h"
namespace remoting::protocol {
namespace {
constexpr net::BackoffEntry::Policy kBackoffPolicy = {
.num_errors_to_ignore = 0,
.initial_delay_ms = base::Seconds(5).InMilliseconds(),
.multiply_factor = 2,
.jitter_factor = 0.5,
.maximum_backoff_ms = base::Minutes(1).InMilliseconds(),
.entry_lifetime_ms = -1, // never discard.
// InformOfRequest() is called before the retry task is scheduled, so the
// initial delay is technically used.
.always_use_initial_delay = false,
};
bool IsRetriableError(HttpStatus::Code code) {
DCHECK_NE(code, HttpStatus::Code::OK);
switch (code) {
case HttpStatus::Code::ABORTED:
case HttpStatus::Code::UNAVAILABLE:
case HttpStatus::Code::NETWORK_ERROR:
case HttpStatus::Code::UNKNOWN:
return true;
default:
return false;
}
}
} // namespace
SessionAuthzReauthorizer::SessionAuthzReauthorizer(
SessionAuthzServiceClient* service_client,
std::string_view session_id,
std::string_view session_reauth_token,
base::TimeDelta session_reauth_token_lifetime,
OnReauthorizationFailedCallback on_reauthorization_failed)
: service_client_(service_client),
session_id_(session_id),
session_reauth_token_(session_reauth_token),
token_expire_time_(base::TimeTicks::Now() +
session_reauth_token_lifetime),
on_reauthorization_failed_(std::move(on_reauthorization_failed)) {}
SessionAuthzReauthorizer::~SessionAuthzReauthorizer() = default;
void SessionAuthzReauthorizer::Start() {
HOST_LOG << "SessionAuthz reauthorizer has started.";
ScheduleNextReauth();
}
const net::BackoffEntry* SessionAuthzReauthorizer::GetBackoffEntryForTest()
const {
return backoff_entry_.get();
}
void SessionAuthzReauthorizer::ScheduleNextReauth() {
base::TimeDelta next_reauth_interval =
backoff_entry_ ? backoff_entry_->GetTimeUntilRelease()
: (token_expire_time_ - base::TimeTicks::Now()) / 2;
reauthorize_timer_.Start(FROM_HERE, next_reauth_interval, this,
&SessionAuthzReauthorizer::Reauthorize);
HOST_LOG << "Next reauthorization scheduled in " << next_reauth_interval;
}
void SessionAuthzReauthorizer::Reauthorize() {
HOST_LOG << "Reauthorizing session...";
service_client_->ReauthorizeHost(
session_reauth_token_, session_id_,
base::BindOnce(&SessionAuthzReauthorizer::OnReauthorizeResult,
base::Unretained(this)));
}
void SessionAuthzReauthorizer::OnReauthorizeResult(
const HttpStatus& status,
std::unique_ptr<internal::ReauthorizeHostResponseStruct> response) {
if (!status.ok()) {
Authenticator::RejectionDetails rejection_details(base::StringPrintf(
"SessionAuthz reauthorization failed with error. Code: %d Message: %s",
static_cast<int>(status.error_code()), status.error_message()));
if (!IsRetriableError(status.error_code())) {
LOG(ERROR) << "Error is non-retriable. Closing the session.";
NotifyReauthorizationFailed(status.error_code(), rejection_details);
return;
}
if (!backoff_entry_) {
backoff_entry_ = std::make_unique<net::BackoffEntry>(&kBackoffPolicy);
}
backoff_entry_->InformOfRequest(false);
// Add some leeway to account for network latencies.
if (backoff_entry_->GetReleaseTime() >
(token_expire_time_ - base::Seconds(5))) {
LOG(ERROR) << "No more retries remaining. Closing the session.";
NotifyReauthorizationFailed(status.error_code(), rejection_details);
return;
}
ScheduleNextReauth();
return;
}
DCHECK(response->session_reauth_token_lifetime.is_positive());
backoff_entry_.reset();
session_reauth_token_ = response->session_reauth_token;
token_expire_time_ =
base::TimeTicks::Now() + response->session_reauth_token_lifetime;
VLOG(1) << "SessionAuthz reauthorization succeeded.";
ScheduleNextReauth();
}
void SessionAuthzReauthorizer::NotifyReauthorizationFailed(
HttpStatus::Code error_code,
const Authenticator::RejectionDetails& details) {
// Make sure the callback causes the reauthorizer to be destroyed (which
// implies the session is closed). Otherwise, crash the process.
reauthorize_timer_.Start(
FROM_HERE, base::Seconds(30), base::BindOnce([]() {
LOG(FATAL) << "SessionAuthzReauthorizer is still alive after the "
<< "reauthorization failure has been notified.";
}));
std::move(on_reauthorization_failed_).Run(error_code, details);
}
} // namespace remoting::protocol
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