1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
// 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/authentication_method.h"
#include "base/logging.h"
#include "crypto/hmac.h"
#include "remoting/protocol/auth_util.h"
#include "remoting/protocol/v1_authenticator.h"
#include "remoting/protocol/v2_authenticator.h"
namespace remoting {
namespace protocol {
// static
AuthenticationMethod AuthenticationMethod::Invalid() {
return AuthenticationMethod();
}
// static
AuthenticationMethod AuthenticationMethod::V1Token() {
return AuthenticationMethod(VERSION_1, NONE);
}
// static
AuthenticationMethod AuthenticationMethod::Spake2(HashFunction hash_function) {
return AuthenticationMethod(VERSION_2, hash_function);
}
// static
AuthenticationMethod AuthenticationMethod::FromString(
const std::string& value) {
if (value == "v1_token") {
return V1Token();
} else if (value == "spake2_plain") {
return Spake2(NONE);
} else if (value == "spake2_hmac") {
return Spake2(HMAC_SHA256);
} else {
return AuthenticationMethod::Invalid();
}
}
// static
std::string AuthenticationMethod::ApplyHashFunction(
HashFunction hash_function,
const std::string& tag,
const std::string& shared_secret) {
switch (hash_function) {
case NONE:
return shared_secret;
break;
case HMAC_SHA256: {
crypto::HMAC response(crypto::HMAC::SHA256);
if (!response.Init(tag)) {
LOG(FATAL) << "HMAC::Init failed";
}
unsigned char out_bytes[kSharedSecretHashLength];
if (!response.Sign(shared_secret, out_bytes, sizeof(out_bytes))) {
LOG(FATAL) << "HMAC::Sign failed";
}
return std::string(out_bytes, out_bytes + sizeof(out_bytes));
}
}
NOTREACHED();
return shared_secret;
}
AuthenticationMethod::AuthenticationMethod()
: invalid_(true),
version_(VERSION_2),
hash_function_(NONE) {
}
AuthenticationMethod::AuthenticationMethod(Version version,
HashFunction hash_function)
: invalid_(false),
version_(version),
hash_function_(hash_function) {
}
scoped_ptr<Authenticator> AuthenticationMethod::CreateAuthenticator(
const std::string& local_jid,
const std::string& tag,
const std::string& shared_secret) const {
DCHECK(is_valid());
switch (version_) {
case VERSION_1:
DCHECK_EQ(hash_function_, NONE);
return scoped_ptr<Authenticator>(
new protocol::V1ClientAuthenticator(local_jid, shared_secret));
case VERSION_2:
return protocol::V2Authenticator::CreateForClient(
ApplyHashFunction(hash_function_, tag, shared_secret),
Authenticator::MESSAGE_READY);
}
NOTREACHED();
return scoped_ptr<Authenticator>(NULL);
}
AuthenticationMethod::Version AuthenticationMethod::version() const {
DCHECK(is_valid());
return version_;
}
AuthenticationMethod::HashFunction AuthenticationMethod::hash_function() const {
DCHECK(is_valid());
return hash_function_;
}
const std::string AuthenticationMethod::ToString() const {
DCHECK(is_valid());
switch (version_) {
case VERSION_1:
return "v1_token";
case VERSION_2:
switch (hash_function_) {
case NONE:
return "spake2_plain";
case HMAC_SHA256:
return "spake2_hmac";
}
}
NOTREACHED();
return "";
}
bool AuthenticationMethod::operator ==(
const AuthenticationMethod& other) const {
if (!is_valid())
return !other.is_valid();
if (!other.is_valid())
return false;
return version_ == other.version_ &&
hash_function_ == other.hash_function_;
}
} // namespace protocol
} // namespace remoting
|
