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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/me2me_host_authenticator_factory.h"
#include "base/base64.h"
#include "base/strings/string_util.h"
#include "remoting/base/rsa_key_pair.h"
#include "remoting/protocol/channel_authenticator.h"
#include "remoting/protocol/negotiating_host_authenticator.h"
#include "remoting/protocol/token_validator.h"
#include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
namespace remoting {
namespace protocol {
namespace {
// Authenticator that accepts one message and rejects connection after that.
class RejectingAuthenticator : public Authenticator {
public:
RejectingAuthenticator()
: state_(WAITING_MESSAGE) {
}
virtual ~RejectingAuthenticator() {
}
virtual State state() const OVERRIDE {
return state_;
}
virtual bool started() const OVERRIDE {
return true;
}
virtual RejectionReason rejection_reason() const OVERRIDE {
DCHECK_EQ(state_, REJECTED);
return INVALID_CREDENTIALS;
}
virtual void ProcessMessage(const buzz::XmlElement* message,
const base::Closure& resume_callback) OVERRIDE {
DCHECK_EQ(state_, WAITING_MESSAGE);
state_ = REJECTED;
resume_callback.Run();
}
virtual scoped_ptr<buzz::XmlElement> GetNextMessage() OVERRIDE {
NOTREACHED();
return scoped_ptr<buzz::XmlElement>();
}
virtual scoped_ptr<ChannelAuthenticator>
CreateChannelAuthenticator() const OVERRIDE {
NOTREACHED();
return scoped_ptr<ChannelAuthenticator>();
}
protected:
State state_;
};
} // namespace
// static
scoped_ptr<AuthenticatorFactory>
Me2MeHostAuthenticatorFactory::CreateWithSharedSecret(
bool use_service_account,
const std::string& host_owner,
const std::string& local_cert,
scoped_refptr<RsaKeyPair> key_pair,
const SharedSecretHash& shared_secret_hash,
scoped_refptr<PairingRegistry> pairing_registry) {
scoped_ptr<Me2MeHostAuthenticatorFactory> result(
new Me2MeHostAuthenticatorFactory());
result->use_service_account_ = use_service_account;
result->host_owner_ = host_owner;
result->local_cert_ = local_cert;
result->key_pair_ = key_pair;
result->shared_secret_hash_ = shared_secret_hash;
result->pairing_registry_ = pairing_registry;
return scoped_ptr<AuthenticatorFactory>(result.Pass());
}
// static
scoped_ptr<AuthenticatorFactory>
Me2MeHostAuthenticatorFactory::CreateWithThirdPartyAuth(
bool use_service_account,
const std::string& host_owner,
const std::string& local_cert,
scoped_refptr<RsaKeyPair> key_pair,
scoped_ptr<TokenValidatorFactory>
token_validator_factory) {
scoped_ptr<Me2MeHostAuthenticatorFactory> result(
new Me2MeHostAuthenticatorFactory());
result->use_service_account_ = use_service_account;
result->host_owner_ = host_owner;
result->local_cert_ = local_cert;
result->key_pair_ = key_pair;
result->token_validator_factory_ = token_validator_factory.Pass();
return scoped_ptr<AuthenticatorFactory>(result.Pass());
}
// static
scoped_ptr<AuthenticatorFactory>
Me2MeHostAuthenticatorFactory::CreateRejecting() {
return scoped_ptr<AuthenticatorFactory>(new Me2MeHostAuthenticatorFactory());
}
Me2MeHostAuthenticatorFactory::Me2MeHostAuthenticatorFactory() {
}
Me2MeHostAuthenticatorFactory::~Me2MeHostAuthenticatorFactory() {
}
scoped_ptr<Authenticator> Me2MeHostAuthenticatorFactory::CreateAuthenticator(
const std::string& local_jid,
const std::string& remote_jid,
const buzz::XmlElement* first_message) {
std::string remote_jid_prefix;
if (!use_service_account_) {
// JID prefixes may not match the host owner email, for example, in cases
// where the host owner account does not have an email associated with it.
// In those cases, the only guarantee we have is that JIDs for the same
// account will have the same prefix.
size_t slash_pos = local_jid.find('/');
if (slash_pos == std::string::npos) {
LOG(DFATAL) << "Invalid local JID:" << local_jid;
return scoped_ptr<Authenticator>(new RejectingAuthenticator());
}
remote_jid_prefix = local_jid.substr(0, slash_pos);
} else {
// TODO(rmsousa): This only works for cases where the JID prefix matches
// the host owner email. Figure out a way to verify the JID in other cases.
remote_jid_prefix = host_owner_;
}
// Verify that the client's jid is an ASCII string, and then check that the
// client JID has the expected prefix. Comparison is case insensitive.
if (!IsStringASCII(remote_jid) ||
!StartsWithASCII(remote_jid, remote_jid_prefix + '/', false)) {
LOG(ERROR) << "Rejecting incoming connection from " << remote_jid;
return scoped_ptr<Authenticator>(new RejectingAuthenticator());
}
if (!local_cert_.empty() && key_pair_.get()) {
if (token_validator_factory_) {
return NegotiatingHostAuthenticator::CreateWithThirdPartyAuth(
local_cert_, key_pair_,
token_validator_factory_->CreateTokenValidator(
local_jid, remote_jid));
}
return NegotiatingHostAuthenticator::CreateWithSharedSecret(
local_cert_, key_pair_, shared_secret_hash_.value,
shared_secret_hash_.hash_function, pairing_registry_);
}
return scoped_ptr<Authenticator>(new RejectingAuthenticator());
}
} // namespace protocol
} // namespace remoting
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