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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/*
* Copyright (c) 2017-2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <hicn/transport/auth/signer.h>
extern "C" {
#ifndef _WIN32
TRANSPORT_CLANG_DISABLE_WARNING("-Wextern-c-compat")
#endif
#include <hicn/hicn.h>
}
#include <chrono>
#define ALLOW_UNALIGNED_READS 1
using namespace std;
namespace transport {
namespace auth {
Signer::Signer() : signer_(nullptr), key_id_(nullptr) { parcSecurity_Init(); }
Signer::Signer(PARCSigner *signer) : Signer() { setSigner(signer); }
Signer::~Signer() {
if (signer_) parcSigner_Release(&signer_);
if (key_id_) parcKeyId_Release(&key_id_);
parcSecurity_Fini();
}
void Signer::signPacket(PacketPtr packet) {
parcAssertNotNull(signer_, "Expected non-null signer");
const utils::MemBuf &header_chain = *packet;
core::Packet::Format format = packet->getFormat();
auto suite = getCryptoSuite();
size_t signature_len = getSignatureSize();
if (!packet->authenticationHeader()) {
throw errors::MalformedAHPacketException();
}
packet->setSignatureSize(signature_len);
// Copy IP+TCP / ICMP header before zeroing them
hicn_header_t header_copy;
hicn_packet_copy_header(format, packet->packet_start_, &header_copy, false);
packet->resetForHash();
// Fill in the HICN_AH header
auto now = chrono::duration_cast<chrono::milliseconds>(
chrono::system_clock::now().time_since_epoch())
.count();
packet->setSignatureTimestamp(now);
packet->setValidationAlgorithm(suite);
// Set the key ID
KeyId key_id;
key_id.first = static_cast<uint8_t *>(
parcBuffer_Overlay((PARCBuffer *)parcKeyId_GetKeyId(key_id_), 0));
packet->setKeyId(key_id);
// Calculate hash
CryptoHasher hasher(parcSigner_GetCryptoHasher(signer_));
const utils::MemBuf *current = &header_chain;
hasher.init();
do {
hasher.updateBytes(current->data(), current->length());
current = current->next();
} while (current != &header_chain);
CryptoHash hash = hasher.finalize();
// Compute signature
PARCSignature *signature = parcSigner_SignDigestNoAlloc(
signer_, hash.hash_, packet->getSignature(), signature_len);
PARCBuffer *buffer = parcSignature_GetSignature(signature);
size_t bytes_len = parcBuffer_Remaining(buffer);
if (bytes_len > signature_len) {
throw errors::MalformedAHPacketException();
}
// Put signature in AH header
hicn_packet_copy_header(format, &header_copy, packet->packet_start_, false);
// Release allocated objects
parcSignature_Release(&signature);
}
void Signer::setSigner(PARCSigner *signer) {
parcAssertNotNull(signer, "Expected non-null signer");
if (signer_) parcSigner_Release(&signer_);
if (key_id_) parcKeyId_Release(&key_id_);
signer_ = parcSigner_Acquire(signer);
key_id_ = parcSigner_CreateKeyId(signer_);
}
size_t Signer::getSignatureSize() const {
parcAssertNotNull(signer_, "Expected non-null signer");
return parcSigner_GetSignatureSize(signer_);
}
CryptoSuite Signer::getCryptoSuite() const {
parcAssertNotNull(signer_, "Expected non-null signer");
return static_cast<CryptoSuite>(parcSigner_GetCryptoSuite(signer_));
}
CryptoHashType Signer::getCryptoHashType() const {
parcAssertNotNull(signer_, "Expected non-null signer");
return static_cast<CryptoHashType>(parcSigner_GetCryptoHashType(signer_));
}
PARCSigner *Signer::getParcSigner() const { return signer_; }
PARCKeyStore *Signer::getParcKeyStore() const {
parcAssertNotNull(signer_, "Expected non-null signer");
return parcSigner_GetKeyStore(signer_);
}
AsymmetricSigner::AsymmetricSigner(CryptoSuite suite, PARCKeyStore *key_store) {
parcAssertNotNull(key_store, "Expected non-null key_store");
auto crypto_suite = static_cast<PARCCryptoSuite>(suite);
switch (suite) {
case CryptoSuite::DSA_SHA256:
case CryptoSuite::RSA_SHA256:
case CryptoSuite::RSA_SHA512:
case CryptoSuite::ECDSA_256K1:
break;
default:
throw errors::RuntimeException(
"Invalid crypto suite for asymmetric signer");
}
setSigner(
parcSigner_Create(parcPublicKeySigner_Create(key_store, crypto_suite),
PARCPublicKeySignerAsSigner));
}
SymmetricSigner::SymmetricSigner(CryptoSuite suite, PARCKeyStore *key_store) {
parcAssertNotNull(key_store, "Expected non-null key_store");
auto crypto_suite = static_cast<PARCCryptoSuite>(suite);
switch (suite) {
case CryptoSuite::HMAC_SHA256:
case CryptoSuite::HMAC_SHA512:
break;
default:
throw errors::RuntimeException(
"Invalid crypto suite for symmetric signer");
}
setSigner(parcSigner_Create(parcSymmetricKeySigner_Create(
(PARCSymmetricKeyStore *)key_store,
parcCryptoSuite_GetCryptoHash(crypto_suite)),
PARCSymmetricKeySignerAsSigner));
}
SymmetricSigner::SymmetricSigner(CryptoSuite suite, const string &passphrase) {
auto crypto_suite = static_cast<PARCCryptoSuite>(suite);
switch (suite) {
case CryptoSuite::HMAC_SHA256:
case CryptoSuite::HMAC_SHA512:
break;
default:
throw errors::RuntimeException(
"Invalid crypto suite for symmetric signer");
}
PARCBufferComposer *composer = parcBufferComposer_Create();
parcBufferComposer_PutString(composer, passphrase.c_str());
PARCBuffer *key_buf = parcBufferComposer_ProduceBuffer(composer);
parcBufferComposer_Release(&composer);
PARCSymmetricKeyStore *key_store = parcSymmetricKeyStore_Create(key_buf);
PARCSymmetricKeySigner *key_signer = parcSymmetricKeySigner_Create(
key_store, parcCryptoSuite_GetCryptoHash(crypto_suite));
setSigner(parcSigner_Create(key_signer, PARCSymmetricKeySignerAsSigner));
parcSymmetricKeySigner_Release(&key_signer);
parcSymmetricKeyStore_Release(&key_store);
parcBuffer_Release(&key_buf);
}
} // namespace auth
} // namespace transport
|
