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/*
* 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(), (uint32_t)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
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