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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 <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(uint8_t *data, size_t datalen) {
if (RAND_bytes(data, static_cast<int>(datalen)) != 1) {
return -1;
}
return 0;
}
int generate_secret(uint8_t *secret, size_t secretlen) {
std::array<uint8_t, 16> rand;
std::array<uint8_t, 32> md;
assert(md.size() == secretlen);
if (generate_secure_random(rand.data(), rand.size()) != 0) {
return -1;
}
auto ctx = EVP_MD_CTX_new();
if (ctx == nullptr) {
return -1;
}
auto ctx_deleter = defer(EVP_MD_CTX_free, ctx);
unsigned int mdlen = md.size();
if (!EVP_DigestInit_ex(ctx, EVP_sha256(), nullptr) ||
!EVP_DigestUpdate(ctx, rand.data(), rand.size()) ||
!EVP_DigestFinal_ex(ctx, md.data(), &mdlen)) {
return -1;
}
std::copy_n(std::begin(md), secretlen, secret);
return 0;
}
std::optional<std::string> read_token(const std::string_view &filename) {
auto f = BIO_new_file(filename.data(), "r");
if (f == nullptr) {
std::cerr << "Could not open token file " << filename << std::endl;
return {};
}
auto f_d = defer(BIO_free, f);
char *name, *header;
unsigned char *data;
long datalen;
std::string token;
if (PEM_read_bio(f, &name, &header, &data, &datalen) != 1) {
std::cerr << "Could not read token file " << filename << std::endl;
return {};
}
OPENSSL_free(name);
OPENSSL_free(header);
auto res = std::string{data, data + datalen};
OPENSSL_free(data);
return res;
}
int write_token(const std::string_view &filename, const uint8_t *token,
size_t tokenlen) {
auto f = BIO_new_file(filename.data(), "w");
if (f == nullptr) {
std::cerr << "Could not write token in " << filename << std::endl;
return -1;
}
PEM_write_bio(f, "QUIC TOKEN", "", token, tokenlen);
BIO_free(f);
return 0;
}
const char *crypto_default_ciphers() {
return "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_"
"SHA256:TLS_AES_128_CCM_SHA256";
}
const char *crypto_default_groups() { return "X25519:P-256:P-384:P-521"; }
} // namespace util
} // namespace ngtcp2
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