Add implementation for current IT2Me auth.

The new SimpleClientAuthenticator and SimpleHostAuthenticator implement
the current IT2Me authentication mechanism.


Review URL: http://codereview.chromium.org/8647001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111321 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 174 insertions, 0 deletions

diff --git a/remoting/protocol/v1_authenticator.cc b/remoting/protocol/v1_authenticator.cc
new file mode 100644
index 0000000..2daf246
--- /dev/null
+++ b/remoting/protocol/v1_authenticator.cc
@@ -0,0 +1,174 @@
+// Copyright (c) 2011 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/v1_client_channel_authenticator.h"
+#include "remoting/protocol/v1_host_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 kAuthenticationTag[] = "authentication";
+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) {
+}
+
+V1ClientAuthenticator::~V1ClientAuthenticator() {
+}
+
+Authenticator::State V1ClientAuthenticator::state() const {
+  return state_;
+}
+
+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;
+  } else {
+    state_ = ACCEPTED;
+  }
+}
+
+XmlElement* V1ClientAuthenticator::GetNextMessage() {
+  DCHECK_EQ(state_, MESSAGE_READY);
+
+  XmlElement* authentication_tag = new XmlElement(
+      QName(kChromotingXmlNamespace, kAuthenticationTag));
+
+  std::string token =
+      protocol::GenerateSupportAuthToken(local_jid_, shared_secret_);
+
+  XmlElement* auth_token_tag = new XmlElement(
+      QName(kChromotingXmlNamespace, kAuthTokenTag));
+  auth_token_tag->SetBodyText(token);
+  authentication_tag->AddElement(auth_token_tag);
+
+  state_ = WAITING_MESSAGE;
+  return authentication_tag;
+}
+
+ChannelAuthenticator*
+V1ClientAuthenticator::CreateChannelAuthenticator() const {
+  DCHECK_EQ(state_, ACCEPTED);
+  return new V1ClientChannelAuthenticator(remote_cert_, shared_secret_);
+};
+
+V1HostAuthenticator::V1HostAuthenticator(
+    const std::string& local_cert,
+    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),
+      shared_secret_(shared_secret),
+      remote_jid_(remote_jid),
+      state_(WAITING_MESSAGE) {
+}
+
+V1HostAuthenticator::~V1HostAuthenticator() {
+}
+
+Authenticator::State V1HostAuthenticator::state() const {
+  return state_;
+}
+
+void V1HostAuthenticator::ProcessMessage(const XmlElement* message) {
+  DCHECK_EQ(state_, WAITING_MESSAGE);
+
+  std::string auth_token =
+      message->TextNamed(buzz::QName(kChromotingXmlNamespace, kAuthTokenTag));
+
+  if (!protocol::VerifySupportAuthToken(
+          remote_jid_, shared_secret_, auth_token)) {
+    state_ = REJECTED;
+  } else {
+    state_ = MESSAGE_READY;
+  }
+}
+
+XmlElement* V1HostAuthenticator::GetNextMessage() {
+  DCHECK_EQ(state_, MESSAGE_READY);
+
+  XmlElement* message = new XmlElement(
+      QName(kChromotingXmlNamespace, kAuthenticationTag));
+
+  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;
+}
+
+ChannelAuthenticator*
+V1HostAuthenticator::CreateChannelAuthenticator() const {
+  DCHECK_EQ(state_, ACCEPTED);
+  return new V1HostChannelAuthenticator(
+      local_cert_, local_private_key_, shared_secret_);
+};
+
+V1HostAuthenticatorFactory::V1HostAuthenticatorFactory(
+    const std::string& local_cert,
+    crypto::RSAPrivateKey* local_private_key,
+    const std::string& shared_secret)
+    : local_cert_(local_cert),
+      shared_secret_(shared_secret) {
+  DCHECK(local_private_key);
+
+  // TODO(hclam): Need a better way to clone a key. See crbug.com/105220 .
+  std::vector<uint8> key_bytes;
+  CHECK(local_private_key->ExportPrivateKey(&key_bytes));
+  local_private_key_.reset(
+      crypto::RSAPrivateKey::CreateFromPrivateKeyInfo(key_bytes));
+  CHECK(local_private_key_.get());
+}
+
+V1HostAuthenticatorFactory::~V1HostAuthenticatorFactory() {
+}
+
+Authenticator* V1HostAuthenticatorFactory::CreateAuthenticator(
+    const std::string& remote_jid,
+    const buzz::XmlElement* first_message) {
+  return new V1HostAuthenticator(local_cert_, local_private_key_.get(),
+                                 shared_secret_, remote_jid);
+}
+
+}  // namespace remoting
+}  // namespace protocol