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
|
// Copyright 2015 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 "net/ssl/token_binding.h"
#include <openssl/bytestring.h>
#include <openssl/ec.h>
#include <openssl/evp.h>
#include <openssl/mem.h>
#include "base/stl_util.h"
#include "crypto/scoped_openssl_types.h"
#include "net/base/net_errors.h"
#include "net/ssl/ssl_config.h"
namespace net {
namespace {
enum TokenBindingType {
TB_TYPE_PROVIDED = 0,
TB_TYPE_REFERRED = 1,
};
bool BuildTokenBindingID(TokenBindingType type,
crypto::ECPrivateKey* key,
CBB* out) {
CBB ec_point;
if (!CBB_add_u8(out, type) || !CBB_add_u8(out, TB_PARAM_ECDSAP256) ||
!CBB_add_u8_length_prefixed(out, &ec_point)) {
return false;
}
EVP_PKEY* pkey = key->key();
static const int kExpectedKeyLength = 65;
uint8_t* buf;
// TODO(nharper): Replace i2o_ECPublicKey with EC_POINT_point2cbb.
if (pkey->type != EVP_PKEY_EC ||
i2o_ECPublicKey(pkey->pkey.ec, nullptr) != kExpectedKeyLength ||
!CBB_add_space(&ec_point, &buf, kExpectedKeyLength) ||
i2o_ECPublicKey(pkey->pkey.ec, &buf) != kExpectedKeyLength ||
!CBB_flush(out)) {
return false;
}
return true;
}
} // namespace
Error BuildTokenBindingMessageFromTokenBindings(
const std::vector<base::StringPiece>& token_bindings,
std::string* out) {
CBB tb_message, child;
if (!CBB_init(&tb_message, 0) ||
!CBB_add_u16_length_prefixed(&tb_message, &child)) {
CBB_cleanup(&tb_message);
return ERR_FAILED;
}
for (const base::StringPiece& token_binding : token_bindings) {
if (!CBB_add_bytes(&child,
reinterpret_cast<const uint8_t*>(token_binding.data()),
token_binding.size())) {
CBB_cleanup(&tb_message);
return ERR_FAILED;
}
}
uint8_t* out_data;
size_t out_len;
if (!CBB_finish(&tb_message, &out_data, &out_len)) {
CBB_cleanup(&tb_message);
return ERR_FAILED;
}
out->assign(reinterpret_cast<char*>(out_data), out_len);
OPENSSL_free(out_data);
return OK;
}
Error BuildProvidedTokenBinding(crypto::ECPrivateKey* key,
const std::vector<uint8_t>& signed_ekm,
std::string* out) {
uint8_t* out_data;
size_t out_len;
CBB token_binding;
if (!CBB_init(&token_binding, 0) ||
!BuildTokenBindingID(TB_TYPE_PROVIDED, key, &token_binding) ||
!CBB_add_u16(&token_binding, signed_ekm.size()) ||
!CBB_add_bytes(&token_binding, signed_ekm.data(), signed_ekm.size()) ||
// 0-length extensions
!CBB_add_u16(&token_binding, 0) ||
!CBB_finish(&token_binding, &out_data, &out_len)) {
CBB_cleanup(&token_binding);
return ERR_FAILED;
}
out->assign(reinterpret_cast<char*>(out_data), out_len);
OPENSSL_free(out_data);
return OK;
}
bool ParseTokenBindingMessage(base::StringPiece token_binding_message,
base::StringPiece* ec_point_out,
base::StringPiece* signature_out) {
CBS tb_message, tb, ec_point, signature;
uint8_t tb_type, tb_param;
CBS_init(&tb_message,
reinterpret_cast<const uint8_t*>(token_binding_message.data()),
token_binding_message.size());
if (!CBS_get_u16_length_prefixed(&tb_message, &tb) ||
!CBS_get_u8(&tb, &tb_type) || !CBS_get_u8(&tb, &tb_param) ||
!CBS_get_u8_length_prefixed(&tb, &ec_point) ||
!CBS_get_u16_length_prefixed(&tb, &signature) ||
tb_type != TB_TYPE_PROVIDED || tb_param != TB_PARAM_ECDSAP256) {
return false;
}
*ec_point_out = base::StringPiece(
reinterpret_cast<const char*>(CBS_data(&ec_point)), CBS_len(&ec_point));
*signature_out = base::StringPiece(
reinterpret_cast<const char*>(CBS_data(&signature)), CBS_len(&signature));
return true;
}
bool VerifyEKMSignature(base::StringPiece ec_point,
base::StringPiece signature,
base::StringPiece ekm) {
crypto::ScopedEC_Key key(EC_KEY_new_by_curve_name(NID_X9_62_prime256v1));
EC_KEY* keyp = key.get();
const uint8_t* ec_point_data =
reinterpret_cast<const uint8_t*>(ec_point.data());
if (o2i_ECPublicKey(&keyp, &ec_point_data, ec_point.size()) != key.get())
return false;
crypto::ScopedEVP_PKEY pkey(EVP_PKEY_new());
if (!EVP_PKEY_assign_EC_KEY(pkey.get(), key.release()))
return false;
crypto::ScopedEVP_PKEY_CTX pctx(EVP_PKEY_CTX_new(pkey.get(), nullptr));
if (!EVP_PKEY_verify_init(pctx.get()) ||
!EVP_PKEY_verify(
pctx.get(), reinterpret_cast<const uint8_t*>(signature.data()),
signature.size(), reinterpret_cast<const uint8_t*>(ekm.data()),
ekm.size())) {
return false;
}
return true;
}
} // namespace net
|
