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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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 "base/bind.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/strings/string_split.h"
#include "remoting/base/constants.h"
#include "remoting/base/rsa_key_pair.h"
#include "remoting/protocol/channel_authenticator.h"
#include "remoting/protocol/name_value_map.h"
#include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
namespace remoting {
namespace protocol {
namespace {
const NameMapElement<NegotiatingAuthenticatorBase::Method>
kAuthenticationMethodStrings[] = {
{NegotiatingAuthenticatorBase::Method::SHARED_SECRET_SPAKE2_P224,
"spake2_hmac"},
{NegotiatingAuthenticatorBase::Method::SHARED_SECRET_SPAKE2_CURVE25519,
"spake2_curve25519"},
{NegotiatingAuthenticatorBase::Method::PAIRED_SPAKE2_P224,
"spake2_pair"},
{NegotiatingAuthenticatorBase::Method::PAIRED_SPAKE2_CURVE25519,
"pair_spake2_curve25519"},
{NegotiatingAuthenticatorBase::Method::THIRD_PARTY_SPAKE2_P224,
"third_party"},
{NegotiatingAuthenticatorBase::Method::THIRD_PARTY_SPAKE2_CURVE25519,
"third_party_spake2_curve25519"},
};
} // namespace
const buzz::StaticQName NegotiatingAuthenticatorBase::kMethodAttributeQName = {
"", "method"};
const buzz::StaticQName
NegotiatingAuthenticatorBase::kSupportedMethodsAttributeQName = {
"", "supported-methods"};
const char NegotiatingAuthenticatorBase::kSupportedMethodsSeparator = ',';
const buzz::StaticQName NegotiatingAuthenticatorBase::kPairingInfoTag = {
kChromotingXmlNamespace, "pairing-info"};
const buzz::StaticQName NegotiatingAuthenticatorBase::kClientIdAttribute = {
"", "client-id"};
NegotiatingAuthenticatorBase::NegotiatingAuthenticatorBase(
Authenticator::State initial_state)
: state_(initial_state) {}
NegotiatingAuthenticatorBase::~NegotiatingAuthenticatorBase() {}
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_;
}
// static
NegotiatingAuthenticatorBase::Method
NegotiatingAuthenticatorBase::ParseMethodString(const std::string& value) {
Method result;
if (!NameToValue(kAuthenticationMethodStrings, value, &result))
return Method::INVALID;
return result;
}
// static
std::string NegotiatingAuthenticatorBase::MethodToString(Method method) {
return ValueToName(kAuthenticationMethodStrings, method);
}
void NegotiatingAuthenticatorBase::ProcessMessageInternal(
const buzz::XmlElement* message,
const base::Closure& 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::Bind(&NegotiatingAuthenticatorBase::UpdateState,
base::Unretained(this), resume_callback));
} else {
// Otherwise, just discard the message.
UpdateState(resume_callback);
}
}
void NegotiatingAuthenticatorBase::UpdateState(
const base::Closure& 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();
resume_callback.Run();
}
scoped_ptr<buzz::XmlElement>
NegotiatingAuthenticatorBase::GetNextMessageInternal() {
DCHECK_EQ(state(), MESSAGE_READY);
DCHECK(current_method_ != Method::INVALID);
scoped_ptr<buzz::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, MethodToString(current_method_));
return result;
}
void NegotiatingAuthenticatorBase::AddMethod(Method method) {
DCHECK(method != Method::INVALID);
methods_.push_back(method);
}
const std::string& NegotiatingAuthenticatorBase::GetAuthKey() const {
DCHECK_EQ(state(), ACCEPTED);
return current_authenticator_->GetAuthKey();
}
scoped_ptr<ChannelAuthenticator>
NegotiatingAuthenticatorBase::CreateChannelAuthenticator() const {
DCHECK_EQ(state(), ACCEPTED);
return current_authenticator_->CreateChannelAuthenticator();
}
} // namespace protocol
} // namespace remoting
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