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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/v1_authenticator.h"
#include "base/base64.h"
#include "base/logging.h"
#include "crypto/rsa_private_key.h"
#include "remoting/base/constants.h"
#include "remoting/protocol/auth_util.h"
#include "remoting/protocol/ssl_hmac_channel_authenticator.h"
#include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
using buzz::QName;
using buzz::XmlElement;
namespace remoting {
namespace protocol {
namespace {
const char kAuthTokenTag[] = "auth-token";
const char kCertificateTag[] = "certificate";
} // namespace
V1ClientAuthenticator::V1ClientAuthenticator(
const std::string& local_jid,
const std::string& shared_secret)
: local_jid_(local_jid),
shared_secret_(shared_secret),
state_(MESSAGE_READY),
rejection_reason_(INVALID_CREDENTIALS) {
}
V1ClientAuthenticator::~V1ClientAuthenticator() {
}
Authenticator::State V1ClientAuthenticator::state() const {
return state_;
}
Authenticator::RejectionReason V1ClientAuthenticator::rejection_reason() const {
DCHECK_EQ(state_, REJECTED);
return rejection_reason_;
}
void V1ClientAuthenticator::ProcessMessage(const XmlElement* message) {
DCHECK_EQ(state_, WAITING_MESSAGE);
// Parse the certificate.
const XmlElement* cert_tag =
message->FirstNamed(QName(kChromotingXmlNamespace, kCertificateTag));
if (cert_tag) {
std::string base64_cert = cert_tag->BodyText();
if (!base::Base64Decode(base64_cert, &remote_cert_)) {
LOG(ERROR) << "Failed to decode certificate received from the peer.";
remote_cert_.clear();
}
}
if (remote_cert_.empty()) {
state_ = REJECTED;
rejection_reason_ = PROTOCOL_ERROR;
} else {
state_ = ACCEPTED;
}
}
scoped_ptr<XmlElement> V1ClientAuthenticator::GetNextMessage() {
DCHECK_EQ(state_, MESSAGE_READY);
scoped_ptr<XmlElement> message = CreateEmptyAuthenticatorMessage();
std::string token =
protocol::GenerateSupportAuthToken(local_jid_, shared_secret_);
XmlElement* auth_token_tag = new XmlElement(
QName(kChromotingXmlNamespace, kAuthTokenTag));
auth_token_tag->SetBodyText(token);
message->AddElement(auth_token_tag);
state_ = WAITING_MESSAGE;
return message.Pass();
}
scoped_ptr<ChannelAuthenticator>
V1ClientAuthenticator::CreateChannelAuthenticator() const {
DCHECK_EQ(state_, ACCEPTED);
scoped_ptr<SslHmacChannelAuthenticator> result =
SslHmacChannelAuthenticator::CreateForClient(
remote_cert_, shared_secret_);
result->SetLegacyOneWayMode(SslHmacChannelAuthenticator::SEND_ONLY);
return result.PassAs<ChannelAuthenticator>();
};
V1HostAuthenticator::V1HostAuthenticator(
const std::string& local_cert,
const crypto::RSAPrivateKey& local_private_key,
const std::string& shared_secret,
const std::string& remote_jid)
: local_cert_(local_cert),
local_private_key_(local_private_key.Copy()),
shared_secret_(shared_secret),
remote_jid_(remote_jid),
state_(WAITING_MESSAGE),
rejection_reason_(INVALID_CREDENTIALS) {
}
V1HostAuthenticator::~V1HostAuthenticator() {
}
Authenticator::State V1HostAuthenticator::state() const {
return state_;
}
Authenticator::RejectionReason V1HostAuthenticator::rejection_reason() const {
DCHECK_EQ(state_, REJECTED);
return rejection_reason_;
}
void V1HostAuthenticator::ProcessMessage(const XmlElement* message) {
DCHECK_EQ(state_, WAITING_MESSAGE);
std::string auth_token =
message->TextNamed(buzz::QName(kChromotingXmlNamespace, kAuthTokenTag));
if (auth_token.empty()) {
state_ = REJECTED;
rejection_reason_ = PROTOCOL_ERROR;
return;
}
if (!protocol::VerifySupportAuthToken(
remote_jid_, shared_secret_, auth_token)) {
state_ = REJECTED;
rejection_reason_ = INVALID_CREDENTIALS;
} else {
state_ = MESSAGE_READY;
}
}
scoped_ptr<XmlElement> V1HostAuthenticator::GetNextMessage() {
DCHECK_EQ(state_, MESSAGE_READY);
scoped_ptr<XmlElement> message = CreateEmptyAuthenticatorMessage();
buzz::XmlElement* certificate_tag = new XmlElement(
buzz::QName(kChromotingXmlNamespace, kCertificateTag));
std::string base64_cert;
if (!base::Base64Encode(local_cert_, &base64_cert)) {
LOG(DFATAL) << "Cannot perform base64 encode on certificate";
}
certificate_tag->SetBodyText(base64_cert);
message->AddElement(certificate_tag);
state_ = ACCEPTED;
return message.Pass();
}
scoped_ptr<ChannelAuthenticator>
V1HostAuthenticator::CreateChannelAuthenticator() const {
DCHECK_EQ(state_, ACCEPTED);
scoped_ptr<SslHmacChannelAuthenticator> result =
SslHmacChannelAuthenticator::CreateForHost(
local_cert_, local_private_key_.get(), shared_secret_);
result->SetLegacyOneWayMode(SslHmacChannelAuthenticator::RECEIVE_ONLY);
return result.PassAs<ChannelAuthenticator>();
};
} // namespace remoting
} // namespace protocol
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