PairingAuthenticator implementation and plumbing.

remoting/protocol/pairing_host_authenticator.cc

+// Copyright 2013 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/pairing_host_authenticator.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "remoting/base/constants.h"
+#include "remoting/base/rsa_key_pair.h"
+#include "remoting/protocol/channel_authenticator.h"
+#include "remoting/protocol/pairing_registry.h"
+#include "remoting/protocol/v2_authenticator.h"
+#include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
+
+namespace remoting {
+namespace protocol {
+
+PairingHostAuthenticator::PairingHostAuthenticator(
+    scoped_refptr<PairingRegistry> pairing_registry,
+    const std::string& local_cert,
+    scoped_refptr<RsaKeyPair> key_pair,
+    const std::string& pin)
+    : pairing_registry_(pairing_registry),
+      local_cert_(local_cert),
+      key_pair_(key_pair),
+      pin_(pin),
+      protocol_error_(false),
+      weak_factory_(this) {
+}
+
+Authenticator::State PairingHostAuthenticator::state() const {
+  if (protocol_error_) {
+    return REJECTED;
+  } else if (!v2_authenticator_) {
+    return WAITING_MESSAGE;
+  }
+  return PairingAuthenticatorBase::state();
+}
+
+Authenticator::RejectionReason
+PairingHostAuthenticator::rejection_reason() const {
+  if (protocol_error_) {
+    return PROTOCOL_ERROR;
+  }
+  return PairingAuthenticatorBase::rejection_reason();
+}
+
+void PairingHostAuthenticator::CreateV2AuthenticatorWithPIN(
+    State initial_state,
+    const SetAuthenticatorCallback& callback) {
+  callback.Run(V2Authenticator::CreateForHost(
+      local_cert_, key_pair_, pin_, initial_state));
+}
+
+void PairingHostAuthenticator::ProcessMessage(
+    const buzz::XmlElement* message,
+    const base::Closure& resume_callback) {
+  if (!v2_authenticator_) {
+    std::string client_id;
+    std::string paired_secret;
+
+    const buzz::XmlElement* pairing_tag = message->FirstNamed(kPairingInfoTag);
+    if (pairing_tag) {
+      client_id = pairing_tag->Attr(kClientIdAttribute);
+    }
+
+    if (client_id.empty()) {
+      LOG(ERROR) << "No client id specified.";
+      protocol_error_ = true;
+    } else {
+      paired_secret = pairing_registry_->GetSecret(client_id);
+      if (paired_secret.empty()) {
+        LOG(INFO) << "Unknown client id";
+        error_message_ = "unknown-client-id";
+      }
+    }
+
+    using_paired_secret_ = !paired_secret.empty();
+    if (using_paired_secret_) {
+      v2_authenticator_  = V2Authenticator::CreateForHost(
+          local_cert_, key_pair_, paired_secret, WAITING_MESSAGE);
+    } else {
+      v2_authenticator_ = V2Authenticator::CreateForHost(
+          local_cert_, key_pair_, pin_, MESSAGE_READY);
+      // The client's optimistic SPAKE message is using a Paired Secret to
+      // which the host doesn't have access, so don't bother processing it.
+      resume_callback.Run();
+      return;
+    }
+  }
+
+  PairingAuthenticatorBase::ProcessMessage(message, resume_callback);
+}
+
+void PairingHostAuthenticator::AddPairingElements(buzz::XmlElement* message) {
+  // Nothing to do here
+}
+
+}  // namespace protocol
+}  // namespace remoting