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/*
* ngtcp2
*
* Copyright (c) 2020 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "util.h"
#include <cassert>
#include <iostream>
#include <array>
#include <algorithm>
#include <ngtcp2/ngtcp2_crypto.h>
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include "template.h"
namespace ngtcp2 {
namespace util {
int generate_secure_random(std::span<uint8_t> data) {
#ifdef WITH_EXAMPLE_BORINGSSL
using size_type = size_t;
#else // !defined(WITH_EXAMPLE_BORINGSSL)
using size_type = int;
#endif // !defined(WITH_EXAMPLE_BORINGSSL)
if (RAND_bytes(data.data(), static_cast<size_type>(data.size())) != 1) {
return -1;
}
return 0;
}
int generate_secret(std::span<uint8_t> secret) {
std::array<uint8_t, 16> rand;
if (generate_secure_random(rand) != 0) {
return -1;
}
auto ctx = EVP_MD_CTX_new();
if (ctx == nullptr) {
return -1;
}
auto ctx_deleter = defer(EVP_MD_CTX_free, ctx);
auto mdlen = static_cast<unsigned int>(secret.size());
if (!EVP_DigestInit_ex(ctx, EVP_sha256(), nullptr) ||
!EVP_DigestUpdate(ctx, rand.data(), rand.size()) ||
!EVP_DigestFinal_ex(ctx, secret.data(), &mdlen)) {
return -1;
}
return 0;
}
namespace {
void openssl_free_wrap(void *ptr) { OPENSSL_free(ptr); }
} // namespace
std::optional<HPKEPrivateKey>
read_hpke_private_key_pem(const std::string_view &filename) {
auto f = BIO_new_file(filename.data(), "r");
if (f == nullptr) {
std::cerr << "Could not open file " << filename << std::endl;
return {};
}
auto f_d = defer(BIO_free, f);
EVP_PKEY *pkey;
if (PEM_read_bio_PrivateKey(f, &pkey, nullptr, nullptr) == nullptr) {
return {};
}
auto pkey_d = defer(EVP_PKEY_free, pkey);
HPKEPrivateKey res;
switch (EVP_PKEY_id(pkey)) {
case EVP_PKEY_X25519: {
res.type = HPKE_DHKEM_X25519_HKDF_SHA256;
size_t len;
EVP_PKEY_get_raw_private_key(pkey, nullptr, &len);
res.bytes.resize(len);
EVP_PKEY_get_raw_private_key(pkey, &res.bytes[0], &len);
break;
}
default:
return {};
}
return res;
}
std::optional<std::vector<uint8_t>> read_pem(const std::string_view &filename,
const std::string_view &name,
const std::string_view &type) {
auto f = BIO_new_file(filename.data(), "r");
if (f == nullptr) {
std::cerr << "Could not open " << name << " file " << filename << std::endl;
return {};
}
auto f_d = defer(BIO_free, f);
for (;;) {
char *pem_type, *header;
unsigned char *data;
long datalen;
if (PEM_read_bio(f, &pem_type, &header, &data, &datalen) != 1) {
std::cerr << "Could not read " << name << " file " << filename
<< std::endl;
return {};
}
auto pem_type_d = defer(openssl_free_wrap, pem_type);
auto pem_header = defer(openssl_free_wrap, header);
auto data_d = defer(openssl_free_wrap, data);
if (type != pem_type) {
continue;
}
return {{data, data + datalen}};
}
}
int write_pem(const std::string_view &filename, const std::string_view &name,
const std::string_view &type, std::span<const uint8_t> data) {
auto f = BIO_new_file(filename.data(), "w");
if (f == nullptr) {
std::cerr << "Could not write " << name << " in " << filename << std::endl;
return -1;
}
PEM_write_bio(f, type.data(), "", data.data(),
static_cast<long>(data.size()));
BIO_free(f);
return 0;
}
const char *crypto_default_ciphers() {
#if defined(WITH_EXAMPLE_QUICTLS) || defined(WITH_EXAMPLE_OSSL)
return "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_"
"SHA256"
# ifndef LIBRESSL_VERSION_NUMBER
":TLS_AES_128_CCM_SHA256"
# endif // !defined(LIBRESSL_VERSION_NUMBER)
;
#else // !(defined(WITH_EXAMPLE_QUICTLS) && defined(WITH_EXAMPLE_OSSL))
return "";
#endif // !(defined(WITH_EXAMPLE_QUICTLS) && defined(WITH_EXAMPLE_OSSL))
}
const char *crypto_default_groups() {
return "X25519:P-256:P-384:P-521"
#if defined(WITH_EXAMPLE_BORINGSSL) || defined(WITH_EXAMPLE_OSSL)
":X25519MLKEM768"
#endif // defined(WITH_EXAMPLE_BORINGSSL) || defined(WITH_EXAMPLE_OSSL)
;
}
} // namespace util
} // namespace ngtcp2
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