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/negotiating_authenticator_base.h"
6
7 #include <algorithm>
8 #include <sstream>
9
10 #include "base/bind.h"
11 #include "base/callback.h"
12 #include "base/logging.h"
13 #include "base/strings/string_split.h"
14 #include "remoting/base/rsa_key_pair.h"
15 #include "remoting/protocol/channel_authenticator.h"
16 #include "remoting/protocol/v2_authenticator.h"
17 #include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
18
19 namespace remoting {
20 namespace protocol {
21
22 const buzz::StaticQName NegotiatingAuthenticatorBase::kMethodAttributeQName =
23 { "", "method" };
24 const buzz::StaticQName
25 NegotiatingAuthenticatorBase::kSupportedMethodsAttributeQName =
26 { "", "supported-methods" };
27 const char NegotiatingAuthenticatorBase::kSupportedMethodsSeparator = ',';
28
NegotiatingAuthenticatorBase(Authenticator::State initial_state)29 NegotiatingAuthenticatorBase::NegotiatingAuthenticatorBase(
30 Authenticator::State initial_state)
31 : current_method_(AuthenticationMethod::Invalid()),
32 state_(initial_state),
33 rejection_reason_(INVALID_CREDENTIALS) {
34 }
35
~NegotiatingAuthenticatorBase()36 NegotiatingAuthenticatorBase::~NegotiatingAuthenticatorBase() {
37 }
38
state() const39 Authenticator::State NegotiatingAuthenticatorBase::state() const {
40 return state_;
41 }
42
started() const43 bool NegotiatingAuthenticatorBase::started() const {
44 if (!current_authenticator_) {
45 return false;
46 }
47 return current_authenticator_->started();
48 }
49
50 Authenticator::RejectionReason
rejection_reason() const51 NegotiatingAuthenticatorBase::rejection_reason() const {
52 return rejection_reason_;
53 }
54
ProcessMessageInternal(const buzz::XmlElement * message,const base::Closure & resume_callback)55 void NegotiatingAuthenticatorBase::ProcessMessageInternal(
56 const buzz::XmlElement* message,
57 const base::Closure& resume_callback) {
58 if (current_authenticator_->state() == WAITING_MESSAGE) {
59 // If the message was not discarded and the authenticator is waiting for it,
60 // give it to the underlying authenticator to process.
61 // |current_authenticator_| is owned, so Unretained() is safe here.
62 state_ = PROCESSING_MESSAGE;
63 current_authenticator_->ProcessMessage(message, base::Bind(
64 &NegotiatingAuthenticatorBase::UpdateState,
65 base::Unretained(this), resume_callback));
66 } else {
67 // Otherwise, just discard the message and run the callback.
68 resume_callback.Run();
69 }
70 }
71
UpdateState(const base::Closure & resume_callback)72 void NegotiatingAuthenticatorBase::UpdateState(
73 const base::Closure& resume_callback) {
74 // After the underlying authenticator finishes processing the message, the
75 // NegotiatingAuthenticatorBase must update its own state before running the
76 // |resume_callback| to resume the session negotiation.
77 state_ = current_authenticator_->state();
78 if (state_ == REJECTED)
79 rejection_reason_ = current_authenticator_->rejection_reason();
80 resume_callback.Run();
81 }
82
83 scoped_ptr<buzz::XmlElement>
GetNextMessageInternal()84 NegotiatingAuthenticatorBase::GetNextMessageInternal() {
85 DCHECK_EQ(state(), MESSAGE_READY);
86 DCHECK(current_method_.is_valid());
87
88 scoped_ptr<buzz::XmlElement> result;
89 if (current_authenticator_->state() == MESSAGE_READY) {
90 result = current_authenticator_->GetNextMessage();
91 } else {
92 result = CreateEmptyAuthenticatorMessage();
93 }
94 state_ = current_authenticator_->state();
95 DCHECK(state_ == ACCEPTED || state_ == WAITING_MESSAGE);
96 result->AddAttr(kMethodAttributeQName, current_method_.ToString());
97 return result.Pass();
98 }
99
AddMethod(const AuthenticationMethod & method)100 void NegotiatingAuthenticatorBase::AddMethod(
101 const AuthenticationMethod& method) {
102 DCHECK(method.is_valid());
103 methods_.push_back(method);
104 }
105
106 scoped_ptr<ChannelAuthenticator>
CreateChannelAuthenticator() const107 NegotiatingAuthenticatorBase::CreateChannelAuthenticator() const {
108 DCHECK_EQ(state(), ACCEPTED);
109 return current_authenticator_->CreateChannelAuthenticator();
110 }
111
112 } // namespace protocol
113 } // namespace remoting
114