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// Copyright 2012 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/negotiating_authenticator_base.h"
#include <algorithm>
#include <sstream>
#include <utility>
#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/strings/string_split.h"
#include "remoting/base/constants.h"
#include "remoting/base/rsa_key_pair.h"
#include "remoting/protocol/authenticator.h"
#include "remoting/protocol/channel_authenticator.h"
#include "remoting/protocol/credentials_type.h"
#include "third_party/libjingle_xmpp/xmllite/xmlelement.h"
namespace remoting::protocol {
const jingle_xmpp::StaticQName
NegotiatingAuthenticatorBase::kMethodAttributeQName = {"", "method"};
const jingle_xmpp::StaticQName
NegotiatingAuthenticatorBase::kSupportedMethodsAttributeQName = {
"", "supported-methods"};
const char NegotiatingAuthenticatorBase::kSupportedMethodsSeparator = ',';
const jingle_xmpp::StaticQName NegotiatingAuthenticatorBase::kPairingInfoTag = {
kChromotingXmlNamespace, "pairing-info"};
const jingle_xmpp::StaticQName
NegotiatingAuthenticatorBase::kClientIdAttribute = {"", "client-id"};
NegotiatingAuthenticatorBase::NegotiatingAuthenticatorBase(
Authenticator::State initial_state)
: state_(initial_state) {}
NegotiatingAuthenticatorBase::~NegotiatingAuthenticatorBase() = default;
CredentialsType NegotiatingAuthenticatorBase::credentials_type() const {
if (!current_authenticator_) {
return CredentialsType::UNKNOWN;
}
return current_authenticator_->credentials_type();
}
const Authenticator& NegotiatingAuthenticatorBase::implementing_authenticator()
const {
return current_authenticator_
? current_authenticator_->implementing_authenticator()
: *this;
}
Authenticator::State NegotiatingAuthenticatorBase::state() const {
return state_;
}
bool NegotiatingAuthenticatorBase::started() const {
if (!current_authenticator_) {
return false;
}
return current_authenticator_->started();
}
Authenticator::RejectionReason NegotiatingAuthenticatorBase::rejection_reason()
const {
return rejection_reason_;
}
Authenticator::RejectionDetails
NegotiatingAuthenticatorBase::rejection_details() const {
return rejection_details_;
}
void NegotiatingAuthenticatorBase::ProcessMessageInternal(
const jingle_xmpp::XmlElement* message,
base::OnceClosure resume_callback) {
DCHECK_EQ(state_, PROCESSING_MESSAGE);
if (current_authenticator_->state() == WAITING_MESSAGE) {
// If the message was not discarded and the authenticator is waiting for it,
// give it to the underlying authenticator to process.
// |current_authenticator_| is owned, so Unretained() is safe here.
current_authenticator_->ProcessMessage(
message,
base::BindOnce(&NegotiatingAuthenticatorBase::UpdateState,
base::Unretained(this), std::move(resume_callback)));
} else {
// Otherwise, just discard the message.
UpdateState(std::move(resume_callback));
}
}
void NegotiatingAuthenticatorBase::UpdateState(
base::OnceClosure resume_callback) {
DCHECK_EQ(state_, PROCESSING_MESSAGE);
// After the underlying authenticator finishes processing the message, the
// NegotiatingAuthenticatorBase must update its own state before running the
// |resume_callback| to resume the session negotiation.
state_ = current_authenticator_->state();
// Verify that this is a valid state transition.
DCHECK(state_ == MESSAGE_READY || state_ == ACCEPTED || state_ == REJECTED)
<< "State: " << state_;
if (state_ == REJECTED) {
rejection_reason_ = current_authenticator_->rejection_reason();
rejection_details_ = current_authenticator_->rejection_details();
}
std::move(resume_callback).Run();
}
std::unique_ptr<jingle_xmpp::XmlElement>
NegotiatingAuthenticatorBase::GetNextMessageInternal() {
DCHECK_EQ(state(), MESSAGE_READY);
DCHECK(current_method_ != AuthenticationMethod::INVALID);
std::unique_ptr<jingle_xmpp::XmlElement> result;
if (current_authenticator_->state() == MESSAGE_READY) {
result = current_authenticator_->GetNextMessage();
} else {
result = CreateEmptyAuthenticatorMessage();
}
state_ = current_authenticator_->state();
DCHECK(state_ == ACCEPTED || state_ == WAITING_MESSAGE);
result->AddAttr(kMethodAttributeQName,
AuthenticationMethodToString(current_method_));
return result;
}
void NegotiatingAuthenticatorBase::NotifyStateChangeAfterAccepted() {
state_ = current_authenticator_->state();
if (state_ == REJECTED) {
rejection_reason_ = current_authenticator_->rejection_reason();
rejection_details_ = current_authenticator_->rejection_details();
}
Authenticator::NotifyStateChangeAfterAccepted();
}
void NegotiatingAuthenticatorBase::AddMethod(AuthenticationMethod method) {
DCHECK(method != AuthenticationMethod::INVALID);
methods_.push_back(method);
}
const std::string& NegotiatingAuthenticatorBase::GetAuthKey() const {
DCHECK_EQ(state(), ACCEPTED);
return current_authenticator_->GetAuthKey();
}
const SessionPolicies* NegotiatingAuthenticatorBase::GetSessionPolicies()
const {
DCHECK_EQ(state(), ACCEPTED);
return current_authenticator_->GetSessionPolicies();
}
std::unique_ptr<ChannelAuthenticator>
NegotiatingAuthenticatorBase::CreateChannelAuthenticator() const {
DCHECK_EQ(state(), ACCEPTED);
return current_authenticator_->CreateChannelAuthenticator();
}
} // namespace remoting::protocol
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