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
|
// 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/auth_util.h"
#include "base/base64.h"
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "crypto/hmac.h"
#include "crypto/sha2.h"
#include "net/base/net_errors.h"
#include "net/socket/ssl_socket.h"
namespace remoting {
namespace protocol {
const char kClientAuthSslExporterLabel[] =
"EXPORTER-remoting-channel-auth-client";
const char kHostAuthSslExporterLabel[] =
"EXPORTER-remoting-channel-auth-host";
const char kSslFakeHostName[] = "chromoting";
std::string GetSharedSecretHash(const std::string& tag,
const std::string& shared_secret) {
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));
}
// static
std::string GetAuthBytes(net::SSLSocket* socket,
const base::StringPiece& label,
const base::StringPiece& shared_secret) {
// Get keying material from SSL.
unsigned char key_material[kAuthDigestLength];
int export_result = socket->ExportKeyingMaterial(
label, false, "", key_material, kAuthDigestLength);
if (export_result != net::OK) {
LOG(ERROR) << "Error fetching keying material: " << export_result;
return std::string();
}
// Generate auth digest based on the keying material and shared secret.
crypto::HMAC response(crypto::HMAC::SHA256);
if (!response.Init(key_material, kAuthDigestLength)) {
NOTREACHED() << "HMAC::Init failed";
return std::string();
}
unsigned char out_bytes[kAuthDigestLength];
if (!response.Sign(shared_secret, out_bytes, kAuthDigestLength)) {
NOTREACHED() << "HMAC::Sign failed";
return std::string();
}
return std::string(out_bytes, out_bytes + kAuthDigestLength);
}
} // namespace protocol
} // namespace remoting
|
