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
|
/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Copyright 2017 Facebook, Inc.
*
* 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/errors/malformed_ahpacket_exception.h>
#include <hicn/transport/utils/endianess.h>
#include <hicn/transport/utils/membuf.h>
#include <hicn/transport/utils/signer.h>
#include <hicn/transport/utils/key_id.h>
extern "C" {
TRANSPORT_CLANG_DISABLE_WARNING("-Wextern-c-compat")
#include <hicn/hicn.h>
#include <parc/security/parc_PublicKeySigner.h>
#include <parc/security/parc_Security.h>
#include <parc/security/parc_SymmetricKeySigner.h>
}
#include <chrono>
#define ALLOW_UNALIGNED_READS 1
namespace utils {
uint8_t Signer::zeros[200] = {0};
/*One signer_ per Private Key*/
Signer::Signer(PARCKeyStore *keyStore, PARCCryptoSuite suite) {
switch (suite) {
case PARCCryptoSuite_NULL_CRC32C:
break;
case PARCCryptoSuite_ECDSA_SHA256:
case PARCCryptoSuite_RSA_SHA256:
case PARCCryptoSuite_DSA_SHA256:
case PARCCryptoSuite_RSA_SHA512:
this->signer_ =
parcSigner_Create(parcPublicKeySigner_Create(keyStore, suite),
PARCPublicKeySignerAsSigner);
this->key_id_ = parcSigner_CreateKeyId(this->signer_);
break;
case PARCCryptoSuite_HMAC_SHA512:
case PARCCryptoSuite_HMAC_SHA256:
default:
this->signer_ = parcSigner_Create(
parcSymmetricKeySigner_Create((PARCSymmetricKeyStore *)keyStore,
parcCryptoSuite_GetCryptoHash(suite)),
PARCSymmetricKeySignerAsSigner);
this->key_id_ = parcSigner_CreateKeyId(this->signer_);
break;
}
}
Signer::Signer(const PARCSigner *signer)
: signer_(parcSigner_Acquire(signer)),
key_id_(parcSigner_CreateKeyId(this->signer_)) {}
Signer::~Signer() {
parcSigner_Release(&signer_);
parcKeyId_Release(&key_id_);
}
void Signer::sign(Packet &packet) {
// header chain points to the IP + TCP hicn header
utils::MemBuf *header_chain = packet.header_head_;
utils::MemBuf * payload_chain = packet.payload_head_;
uint8_t *hicn_packet = header_chain->writableData();
Packet::Format format = packet.getFormat();
std::size_t sign_len_bytes = parcSigner_GetSignatureSize(signer_);
if (!(format & HFO_AH)) {
throw errors::MalformedAHPacketException();
}
// Copy IP+TCP/ICMP header before zeroing them
hicn_header_t header_copy;
if (format & HFO_INET) {
memcpy(&header_copy, hicn_packet, sizeof(hicn_v4_hdr_t));
} else if (format & HFO_INET6) {
memcpy(&header_copy, hicn_packet, sizeof(hicn_v6_hdr_t));
}
std::size_t header_len = Packet::getHeaderSizeFromFormat(format);
packet.resetForHash();
packet.setSignatureSize(sign_len_bytes);
/* Fill the hicn_ah header */
using namespace std::chrono;
auto now = duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count();
packet.setSignatureTimestamp(now);
// *reinterpret_cast<uint64_t*>(ah->signTime) = utils::hton<uint64_t>(now);
// // std::memcpy(&ah->hicn_ah.signTime, &sign_time, sizeof(ah->hicn_ah.signTime));
packet.setValidationAlgorithm(CryptoSuite(parcSigner_GetCryptoSuite(this->signer_)));
// ah->validationAlgorithm = parcSigner_GetCryptoSuite(this->signer_);
KeyId key_id;
key_id.first = (uint8_t *)parcBuffer_Overlay((PARCBuffer *) parcKeyId_GetKeyId(this->key_id_), 0);
packet.setKeyId(key_id);
// memcpy(ah->keyId,
// parcBuffer_Overlay((PARCBuffer *) parcKeyId_GetKeyId(this->key_id_), 0),
// sizeof(_ah_header_t::keyId));
// Calculate hash
utils::CryptoHasher hasher(parcSigner_GetCryptoHasher(signer_));
hasher.init();
hasher.updateBytes(hicn_packet, header_len);
hasher.updateBytes(zeros, sign_len_bytes);
for (utils::MemBuf *current = payload_chain; current != header_chain; current = current->next()) {
hasher.updateBytes(current->data(), current->length());
}
utils::CryptoHash hash = hasher.finalize();
PARCSignature *signature = parcSigner_SignDigest(this->signer_, hash.hash_);
PARCBuffer *buffer = parcSignature_GetSignature(signature);
PARCByteArray * byte_array = parcBuffer_Array(buffer);
uint8_t * bytes = parcByteArray_Array(byte_array);
size_t bytes_len = parcBuffer_Remaining(buffer);
if (bytes_len > sign_len_bytes) {
throw errors::MalformedAHPacketException();
}
/* Restore the resetted fields */
if (format & HFO_INET) {
memcpy(hicn_packet, &header_copy, sizeof(hicn_v4_hdr_t));
} else if (format & HFO_INET6) {
memcpy(hicn_packet, &header_copy, sizeof(hicn_v6_hdr_t));
}
int offset = sign_len_bytes - bytes_len;
std::unique_ptr<utils::MemBuf> signature_buffer;
std::unique_ptr<utils::MemBuf> tmp_buf = utils::MemBuf::takeOwnership(
bytes,
bytes_len,
bytes_len,
[](void* buf, void* userData){ parcSignature_Release((PARCSignature **)&userData); },
signature,
true);
if (offset) {
signature_buffer = utils::MemBuf::create(offset);
memset(signature_buffer->writableData(), 0, offset);
signature_buffer->append(offset);
signature_buffer->appendChain(std::move(tmp_buf));
} else {
signature_buffer = std::move(tmp_buf);
}
packet.setSignature(std::move(signature_buffer));
}
} // namespace utils
|
