remoting/protocol/me2me_host_authenticator_factory.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "remoting/protocol/me2me_host_authenticator_factory.h"
   6
   7 #include "base/base64.h"
   8 #include "base/strings/string_util.h"
   9 #include "remoting/base/rsa_key_pair.h"
  10 #include "remoting/protocol/channel_authenticator.h"
  11 #include "remoting/protocol/negotiating_host_authenticator.h"
  12 #include "remoting/protocol/token_validator.h"
  13 #include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
  14
  15 namespace remoting {
  16 namespace protocol {
  17
  18 namespace {
  19
  20 // Authenticator that accepts one message and rejects connection after that.
  21 class RejectingAuthenticator : public Authenticator {
  22  public:
  23   RejectingAuthenticator()
  24       : state_(WAITING_MESSAGE) {
  25   }
  26   virtual ~RejectingAuthenticator() {
  27   }
  28
  29   virtual State state() const OVERRIDE {
  30     return state_;
  31   }
  32
  33   virtual bool started() const OVERRIDE {
  34     return true;
  35   }
  36
  37   virtual RejectionReason rejection_reason() const OVERRIDE {
  38     DCHECK_EQ(state_, REJECTED);
  39     return INVALID_CREDENTIALS;
  40   }
  41
  42   virtual void ProcessMessage(const buzz::XmlElement* message,
  43                               const base::Closure& resume_callback) OVERRIDE {
  44     DCHECK_EQ(state_, WAITING_MESSAGE);
  45     state_ = REJECTED;
  46     resume_callback.Run();
  47   }
  48
  49   virtual scoped_ptr<buzz::XmlElement> GetNextMessage() OVERRIDE {
  50     NOTREACHED();
  51     return scoped_ptr<buzz::XmlElement>();
  52   }
  53
  54   virtual scoped_ptr<ChannelAuthenticator>
  55   CreateChannelAuthenticator() const OVERRIDE {
  56     NOTREACHED();
  57     return scoped_ptr<ChannelAuthenticator>();
  58   }
  59
  60  protected:
  61   State state_;
  62 };
  63
  64 }  // namespace
  65
  66 // static
  67 scoped_ptr<AuthenticatorFactory>
  68 Me2MeHostAuthenticatorFactory::CreateWithSharedSecret(
  69     bool use_service_account,
  70     const std::string& host_owner,
  71     const std::string& local_cert,
  72     scoped_refptr<RsaKeyPair> key_pair,
  73     const SharedSecretHash& shared_secret_hash,
  74     scoped_refptr<PairingRegistry> pairing_registry) {
  75   scoped_ptr<Me2MeHostAuthenticatorFactory> result(
  76       new Me2MeHostAuthenticatorFactory());
  77   result->use_service_account_ = use_service_account;
  78   result->host_owner_ = host_owner;
  79   result->local_cert_ = local_cert;
  80   result->key_pair_ = key_pair;
  81   result->shared_secret_hash_ = shared_secret_hash;
  82   result->pairing_registry_ = pairing_registry;
  83   return scoped_ptr<AuthenticatorFactory>(result.Pass());
  84 }
  85
  86
  87 // static
  88 scoped_ptr<AuthenticatorFactory>
  89 Me2MeHostAuthenticatorFactory::CreateWithThirdPartyAuth(
  90     bool use_service_account,
  91     const std::string& host_owner,
  92     const std::string& local_cert,
  93     scoped_refptr<RsaKeyPair> key_pair,
  94     scoped_ptr<TokenValidatorFactory>
  95         token_validator_factory) {
  96   scoped_ptr<Me2MeHostAuthenticatorFactory> result(
  97       new Me2MeHostAuthenticatorFactory());
  98   result->use_service_account_ = use_service_account;
  99   result->host_owner_ = host_owner;
 100   result->local_cert_ = local_cert;
 101   result->key_pair_ = key_pair;
 102   result->token_validator_factory_ = token_validator_factory.Pass();
 103   return scoped_ptr<AuthenticatorFactory>(result.Pass());
 104 }
 105
 106 // static
 107 scoped_ptr<AuthenticatorFactory>
 108     Me2MeHostAuthenticatorFactory::CreateRejecting() {
 109   return scoped_ptr<AuthenticatorFactory>(new Me2MeHostAuthenticatorFactory());
 110 }
 111
 112 Me2MeHostAuthenticatorFactory::Me2MeHostAuthenticatorFactory() {
 113 }
 114
 115 Me2MeHostAuthenticatorFactory::~Me2MeHostAuthenticatorFactory() {
 116 }
 117
 118 scoped_ptr<Authenticator> Me2MeHostAuthenticatorFactory::CreateAuthenticator(
 119     const std::string& local_jid,
 120     const std::string& remote_jid,
 121     const buzz::XmlElement* first_message) {
 122
 123   std::string remote_jid_prefix;
 124
 125   if (!use_service_account_) {
 126     // JID prefixes may not match the host owner email, for example, in cases
 127     // where the host owner account does not have an email associated with it.
 128     // In those cases, the only guarantee we have is that JIDs for the same
 129     // account will have the same prefix.
 130     size_t slash_pos = local_jid.find('/');
 131     if (slash_pos == std::string::npos) {
 132       LOG(DFATAL) << "Invalid local JID:" << local_jid;
 133       return scoped_ptr<Authenticator>(new RejectingAuthenticator());
 134     }
 135     remote_jid_prefix = local_jid.substr(0, slash_pos);
 136   } else {
 137     // TODO(rmsousa): This only works for cases where the JID prefix matches
 138     // the host owner email. Figure out a way to verify the JID in other cases.
 139     remote_jid_prefix = host_owner_;
 140   }
 141
 142   // Verify that the client's jid is an ASCII string, and then check that the
 143   // client JID has the expected prefix. Comparison is case insensitive.
 144   if (!base::IsStringASCII(remote_jid) ||
 145       !StartsWithASCII(remote_jid, remote_jid_prefix + '/', false)) {
 146     LOG(ERROR) << "Rejecting incoming connection from " << remote_jid;
 147     return scoped_ptr<Authenticator>(new RejectingAuthenticator());
 148   }
 149
 150   if (!local_cert_.empty() && key_pair_.get()) {
 151     if (token_validator_factory_) {
 152       return NegotiatingHostAuthenticator::CreateWithThirdPartyAuth(
 153           local_cert_, key_pair_,
 154           token_validator_factory_->CreateTokenValidator(
 155               local_jid, remote_jid));
 156     }
 157
 158     return NegotiatingHostAuthenticator::CreateWithSharedSecret(
 159         local_cert_, key_pair_, shared_secret_hash_.value,
 160         shared_secret_hash_.hash_function, pairing_registry_);
 161   }
 162
 163   return scoped_ptr<Authenticator>(new RejectingAuthenticator());
 164 }
 165
 166 }  // namespace protocol
 167 }  // namespace remoting