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/*
* 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/security/key_id.h>
#include <hicn/transport/security/signer.h>
#include <hicn/transport/utils/membuf.h>
extern "C" {
#ifndef _WIN32
TRANSPORT_CLANG_DISABLE_WARNING("-Wextern-c-compat")
#endif
#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, CryptoSuite suite) {
parcSecurity_Init();
switch (suite) {
case CryptoSuite::DSA_SHA256:
case CryptoSuite::RSA_SHA256:
case CryptoSuite::RSA_SHA512:
case CryptoSuite::ECDSA_256K1: {
this->signer_ =
parcSigner_Create(parcPublicKeySigner_Create(
keyStore, static_cast<PARCCryptoSuite>(suite)),
PARCPublicKeySignerAsSigner);
break;
}
case CryptoSuite::HMAC_SHA256:
case CryptoSuite::HMAC_SHA512: {
this->signer_ =
parcSigner_Create(parcSymmetricKeySigner_Create(
(PARCSymmetricKeyStore *)keyStore,
parcCryptoSuite_GetCryptoHash(
static_cast<PARCCryptoSuite>(suite))),
PARCSymmetricKeySignerAsSigner);
break;
}
default: { return; }
}
suite_ = suite;
key_id_ = parcSigner_CreateKeyId(this->signer_);
signature_length_ = parcSigner_GetSignatureSize(this->signer_);
}
Signer::Signer(const std::string &passphrase, CryptoSuite suite) {
parcSecurity_Init();
switch (suite) {
case CryptoSuite::HMAC_SHA256:
case CryptoSuite::HMAC_SHA512: {
composer_ = parcBufferComposer_Create();
parcBufferComposer_PutString(composer_, passphrase.c_str());
key_buffer_ = parcBufferComposer_ProduceBuffer(composer_);
symmetricKeyStore_ = parcSymmetricKeyStore_Create(key_buffer_);
this->signer_ = parcSigner_Create(
parcSymmetricKeySigner_Create(
symmetricKeyStore_, parcCryptoSuite_GetCryptoHash(
static_cast<PARCCryptoSuite>(suite))),
PARCSymmetricKeySignerAsSigner);
break;
}
default: { return; }
}
suite_ = suite;
key_id_ = parcSigner_CreateKeyId(this->signer_);
signature_length_ = parcSigner_GetSignatureSize(this->signer_);
}
Signer::Signer(const PARCSigner *signer, CryptoSuite suite)
: signer_(parcSigner_Acquire(signer)),
key_id_(parcSigner_CreateKeyId(this->signer_)),
suite_(suite),
signature_length_(parcSigner_GetSignatureSize(this->signer_)) {
parcSecurity_Init();
}
Signer::Signer(const PARCSigner *signer)
: Signer(signer, CryptoSuite::UNKNOWN) {}
Signer::~Signer() {
if (signature_) parcSignature_Release(&signature_);
if (symmetricKeyStore_) parcSymmetricKeyStore_Release(&symmetricKeyStore_);
if (key_buffer_) parcBuffer_Release(&key_buffer_);
if (composer_) parcBufferComposer_Release(&composer_);
if (signer_) parcSigner_Release(&signer_);
if (key_id_) parcKeyId_Release(&key_id_);
parcSecurity_Fini();
}
void Signer::sign(Packet &packet) {
// header chain points to the IP + TCP hicn header + AH Header
MemBuf *header_chain = packet.header_head_;
MemBuf *payload_chain = packet.payload_head_;
uint8_t *hicn_packet = (uint8_t *)header_chain->writableData();
Packet::Format format = packet.getFormat();
if (!(format & HFO_AH)) {
throw errors::MalformedAHPacketException();
}
packet.setSignatureSize(signature_length_);
// Copy IP+TCP/ICMP header before zeroing them
hicn_header_t header_copy;
hicn_packet_copy_header(format, (const hicn_header_t *)packet.packet_start_,
&header_copy, false);
std::size_t header_len = Packet::getHeaderSizeFromFormat(format);
packet.resetForHash();
/* Fill the hicn_ah header */
using namespace std::chrono;
auto now = duration_cast<milliseconds>(system_clock::now().time_since_epoch())
.count();
packet.setSignatureTimestamp(now);
packet.setValidationAlgorithm(suite_);
KeyId key_id;
key_id.first = (uint8_t *)parcBuffer_Overlay(
(PARCBuffer *)parcKeyId_GetKeyId(this->key_id_), 0);
packet.setKeyId(key_id);
// Calculate hash
CryptoHasher hasher(parcSigner_GetCryptoHasher(signer_));
hasher.init();
hasher.updateBytes(hicn_packet, header_len + signature_length_);
for (MemBuf *current = payload_chain; current != header_chain;
current = current->next()) {
hasher.updateBytes(current->data(), current->length());
}
CryptoHash hash = hasher.finalize();
signature_ = parcSigner_SignDigestNoAlloc(this->signer_, hash.hash_,
packet.getSignature(),
(uint32_t)signature_length_);
PARCBuffer *buffer = parcSignature_GetSignature(signature_);
size_t bytes_len = parcBuffer_Remaining(buffer);
if (bytes_len > signature_length_) {
throw errors::MalformedAHPacketException();
}
hicn_packet_copy_header(format, &header_copy,
(hicn_header_t *)packet.packet_start_, false);
}
size_t Signer::getSignatureLength() { return signature_length_; }
PARCKeyStore *Signer::getKeyStore() {
return parcSigner_GetKeyStore(this->signer_);
}
} // namespace utils
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