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#pragma once
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/tls1.h>
namespace NHttp {
struct TSslHelpers {
struct TSslDestroy {
static void Destroy(SSL_CTX* ctx) noexcept {
SSL_CTX_free(ctx);
}
static void Destroy(SSL* ssl) noexcept {
SSL_free(ssl);
}
static void Destroy(X509* cert) noexcept {
X509_free(cert);
}
static void Destroy(EVP_PKEY* pkey) noexcept {
EVP_PKEY_free(pkey);
}
static void Destroy(BIO* bio) noexcept {
BIO_free(bio);
}
};
template <typename T>
using TSslHolder = THolder<T, TSslDestroy>;
static TSslHolder<SSL_CTX> CreateSslCtx(const SSL_METHOD* method) {
TSslHolder<SSL_CTX> ctx(SSL_CTX_new(method));
if (ctx) {
SSL_CTX_set_options(ctx.Get(), SSL_OP_NO_SSLv2);
SSL_CTX_set_options(ctx.Get(), SSL_OP_NO_SSLv3);
SSL_CTX_set_options(ctx.Get(), SSL_OP_MICROSOFT_SESS_ID_BUG);
SSL_CTX_set_options(ctx.Get(), SSL_OP_NETSCAPE_CHALLENGE_BUG);
}
return ctx;
}
static TSslHolder<SSL_CTX> CreateClientContext() {
return CreateSslCtx(SSLv23_client_method());
}
static TSslHolder<SSL_CTX> CreateServerContext(const TString& certificate, const TString& key) {
TSslHolder<SSL_CTX> ctx = CreateSslCtx(SSLv23_server_method());
SSL_CTX_set_ecdh_auto(ctx.Get(), 1);
int res;
res = SSL_CTX_use_certificate_chain_file(ctx.Get(), certificate.c_str());
if (res < 0) {
// TODO(xenoxeno): more diagnostics?
return nullptr;
}
res = SSL_CTX_use_PrivateKey_file(ctx.Get(), key.c_str(), SSL_FILETYPE_PEM);
if (res < 0) {
// TODO(xenoxeno): more diagnostics?
return nullptr;
}
return ctx;
}
static bool LoadX509Chain(TSslHolder<SSL_CTX>& ctx, const TString& pem) {
TSslHolder<BIO> bio(BIO_new_mem_buf(pem.c_str(), pem.size()));
if (bio == nullptr) {
return false;
}
TSslHolder<X509> cert(PEM_read_bio_X509_AUX(bio.Get(), nullptr, nullptr, nullptr));
if (cert == nullptr) {
return false;
}
if (SSL_CTX_use_certificate(ctx.Get(), cert.Release()) <= 0) {
return false;
}
SSL_CTX_clear_chain_certs(ctx.Get());
while (true) {
TSslHolder<X509> ca(PEM_read_bio_X509(bio.Get(), nullptr, nullptr, nullptr));
if (ca == nullptr) {
break;
}
if (!SSL_CTX_add0_chain_cert(ctx.Get(), ca.Release())) {
return false;
}
}
return true;
}
static bool LoadPrivateKey(TSslHolder<SSL_CTX>& ctx, const TString& pem) {
TSslHolder<BIO> bio(BIO_new_mem_buf(pem.c_str(), pem.size()));
if (bio == nullptr) {
return false;
}
TSslHolder<EVP_PKEY> pkey(PEM_read_bio_PrivateKey(bio.Get(), nullptr, nullptr, nullptr));
if (SSL_CTX_use_PrivateKey(ctx.Get(), pkey.Release()) <= 0) {
return false;
}
return true;
}
static TSslHolder<SSL_CTX> CreateServerContext(const TString& pem) {
TSslHolder<SSL_CTX> ctx = CreateSslCtx(SSLv23_server_method());
SSL_CTX_set_ecdh_auto(ctx.Get(), 1);
if (!LoadX509Chain(ctx, pem)) {
return nullptr;
}
if (!LoadPrivateKey(ctx, pem)) {
return nullptr;
}
return ctx;
}
static TSslHolder<SSL> ConstructSsl(SSL_CTX* ctx, BIO* bio) {
TSslHolder<SSL> ssl(SSL_new(ctx));
if (ssl) {
BIO_up_ref(bio); // SSL_set_bio consumes only one reference if rbio and wbio are the same
SSL_set_bio(ssl.Get(), bio, bio);
}
return ssl;
}
};
}
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