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Merge pull request #1162 from nghttp2/libressl 

Libressl
This commit is contained in:
Tatsuhiro Tsujikawa 2018-04-14 23:57:20 +09:00 committed by GitHub
parent 3febaef1fa 009646421c
commit e04de48ed9
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 54 additions and 51 deletions
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10
src/nghttp.cc
View File

@ -59,6 +59,7 @@
#include "base64.h" #include "base64.h"
#include "tls.h" #include "tls.h"
#include "template.h" #include "template.h"
#include "ssl_compat.h"
#ifndef O_BINARY #ifndef O_BINARY
#define O_BINARY (0) #define O_BINARY (0)
@ -680,15 +681,16 @@ int HttpClient::initiate_connection() {
const auto &host_string = const auto &host_string =
config.host_override.empty() ? host : config.host_override; config.host_override.empty() ? host : config.host_override;
#if (!defined(LIBRESSL_VERSION_NUMBER) && \ #if LIBRESSL_2_7_API || \
OPENSSL_VERSION_NUMBER >= 0x10002000L) || \ (!LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L) || \
defined(OPENSSL_IS_BORINGSSL) defined(OPENSSL_IS_BORINGSSL)
auto param = SSL_get0_param(ssl); auto param = SSL_get0_param(ssl);
X509_VERIFY_PARAM_set_hostflags(param, 0); X509_VERIFY_PARAM_set_hostflags(param, 0);
X509_VERIFY_PARAM_set1_host(param, host_string.c_str(), X509_VERIFY_PARAM_set1_host(param, host_string.c_str(),
host_string.size()); host_string.size());
#endif // (!defined(LIBRESSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER >= #endif // LIBRESSL_2_7_API || (!LIBRESSL_IN_USE &&
// 0x10002000L) || defined(OPENSSL_IS_BORINGSSL) // OPENSSL_VERSION_NUMBER >= 0x10002000L) ||
// defined(OPENSSL_IS_BORINGSSL)
SSL_set_verify(ssl, SSL_VERIFY_PEER, verify_cb); SSL_set_verify(ssl, SSL_VERIFY_PEER, verify_cb);
if (!util::numeric_host(host_string.c_str())) { if (!util::numeric_host(host_string.c_str())) {

38
src/shrpx_config.cc
View File

@ -1222,7 +1222,7 @@ int parse_subcert_params(SubcertParams &out, const StringRef &src_params) {
auto param = StringRef{first, end}; auto param = StringRef{first, end};
if (util::istarts_with_l(param, "sct-dir=")) { if (util::istarts_with_l(param, "sct-dir=")) {
#if !LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L #if !LIBRESSL_LEGACY_API && OPENSSL_VERSION_NUMBER >= 0x10002000L
auto sct_dir = auto sct_dir =
StringRef{std::begin(param) + str_size("sct-dir="), std::end(param)}; StringRef{std::begin(param) + str_size("sct-dir="), std::end(param)};
if (sct_dir.empty()) { if (sct_dir.empty()) {
@ -1230,9 +1230,9 @@ int parse_subcert_params(SubcertParams &out, const StringRef &src_params) {
return -1; return -1;
} }
out.sct_dir = sct_dir; out.sct_dir = sct_dir;
#else // !(!LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L) #else // !(!LIBRESSL_LEGACY_API && OPENSSL_VERSION_NUMBER >= 0x10002000L)
LOG(WARN) << "subcert: sct-dir requires OpenSSL >= 1.0.2"; LOG(WARN) << "subcert: sct-dir requires OpenSSL >= 1.0.2";
#endif // !(!LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L) #endif // !(!LIBRESSL_LEGACY_API && OPENSSL_VERSION_NUMBER >= 0x10002000L)
} else if (!param.empty()) { } else if (!param.empty()) {
LOG(ERROR) << "subcert: " << param << ": unknown keyword"; LOG(ERROR) << "subcert: " << param << ": unknown keyword";
return -1; return -1;
@ -1364,7 +1364,7 @@ int read_tls_sct_from_dir(std::vector<uint8_t> &dst, const StringRef &opt,
} }
} // namespace } // namespace
#if !LIBRESSL_IN_USE #if !LIBRESSL_LEGACY_API
namespace { namespace {
// Reads PSK secrets from path, and parses each line. The result is // Reads PSK secrets from path, and parses each line. The result is
// directly stored into config->tls.psk_secrets. This function // directly stored into config->tls.psk_secrets. This function
@ -1428,9 +1428,9 @@ int parse_psk_secrets(Config *config, const StringRef &path) {
return 0; return 0;
} }
} // namespace } // namespace
#endif // !LIBRESSL_IN_USE #endif // !LIBRESSL_LEGACY_API
#if !LIBRESSL_IN_USE #if !LIBRESSL_LEGACY_API
namespace { namespace {
// Reads PSK secrets from path, and parses each line. The result is // Reads PSK secrets from path, and parses each line. The result is
// directly stored into config->tls.client.psk. This function returns // directly stored into config->tls.client.psk. This function returns
@ -1490,7 +1490,7 @@ int parse_client_psk_secrets(Config *config, const StringRef &path) {
return 0; return 0;
} }
} // namespace } // namespace
#endif // !LIBRESSL_IN_USE #endif // !LIBRESSL_LEGACY_API
// generated by gennghttpxfun.py // generated by gennghttpxfun.py
int option_lookup_token(const char *name, size_t namelen) { int option_lookup_token(const char *name, size_t namelen) {
@ -3454,19 +3454,19 @@ int parse_config(Config *config, int optid, const StringRef &opt,
return parse_uint_with_unit( return parse_uint_with_unit(
&config->http2.downstream.decoder_dynamic_table_size, opt, optarg); &config->http2.downstream.decoder_dynamic_table_size, opt, optarg);
case SHRPX_OPTID_ECDH_CURVES: case SHRPX_OPTID_ECDH_CURVES:
#if !LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L #if !LIBRESSL_LEGACY_API && OPENSSL_VERSION_NUMBER >= 0x10002000L
config->tls.ecdh_curves = make_string_ref(config->balloc, optarg); config->tls.ecdh_curves = make_string_ref(config->balloc, optarg);
#else // !(!LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L) #else // !(!LIBRESSL_LEGACY_API && OPENSSL_VERSION_NUMBER >= 0x10002000L)
LOG(WARN) << opt << ": This option requires OpenSSL >= 1.0.2"; LOG(WARN) << opt << ": This option requires OpenSSL >= 1.0.2";
#endif // !(!LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L) #endif // !(!LIBRESSL_LEGACY_API && OPENSSL_VERSION_NUMBER >= 0x10002000L)
return 0; return 0;
case SHRPX_OPTID_TLS_SCT_DIR: case SHRPX_OPTID_TLS_SCT_DIR:
#if !LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L #if !LIBRESSL_LEGACY_API && OPENSSL_VERSION_NUMBER >= 0x10002000L
return read_tls_sct_from_dir(config->tls.sct_data, opt, optarg); return read_tls_sct_from_dir(config->tls.sct_data, opt, optarg);
#else // !(!LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L) #else // !(!LIBRESSL_LEGACY_API && OPENSSL_VERSION_NUMBER >= 0x10002000L)
LOG(WARN) << opt << ": This option requires OpenSSL >= 1.0.2"; LOG(WARN) << opt << ": This option requires OpenSSL >= 1.0.2";
return 0; return 0;
#endif // !(!LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L) #endif // !(!LIBRESSL_LEGACY_API && OPENSSL_VERSION_NUMBER >= 0x10002000L)
case SHRPX_OPTID_DNS_CACHE_TIMEOUT: case SHRPX_OPTID_DNS_CACHE_TIMEOUT:
return parse_duration(&config->dns.timeout.cache, opt, optarg); return parse_duration(&config->dns.timeout.cache, opt, optarg);
case SHRPX_OPTID_DNS_LOOKUP_TIMEOUT: case SHRPX_OPTID_DNS_LOOKUP_TIMEOUT:
@ -3489,23 +3489,23 @@ int parse_config(Config *config, int optid, const StringRef &opt,
return parse_duration(&config->conn.upstream.timeout.idle_read, opt, return parse_duration(&config->conn.upstream.timeout.idle_read, opt,
optarg); optarg);
case SHRPX_OPTID_PSK_SECRETS: case SHRPX_OPTID_PSK_SECRETS:
#if !LIBRESSL_IN_USE #if !LIBRESSL_LEGACY_API
return parse_psk_secrets(config, optarg); return parse_psk_secrets(config, optarg);
#else // LIBRESSL_IN_USE #else // LIBRESSL_LEGACY_API
LOG(WARN) LOG(WARN)
<< opt << opt
<< ": ignored because underlying TLS library does not support PSK"; << ": ignored because underlying TLS library does not support PSK";
return 0; return 0;
#endif // LIBRESSL_IN_USE #endif // LIBRESSL_LEGACY_API
case SHRPX_OPTID_CLIENT_PSK_SECRETS: case SHRPX_OPTID_CLIENT_PSK_SECRETS:
#if !LIBRESSL_IN_USE #if !LIBRESSL_LEGACY_API
return parse_client_psk_secrets(config, optarg); return parse_client_psk_secrets(config, optarg);
#else // LIBRESSL_IN_USE #else // LIBRESSL_LEGACY_API
LOG(WARN) LOG(WARN)
<< opt << opt
<< ": ignored because underlying TLS library does not support PSK"; << ": ignored because underlying TLS library does not support PSK";
return 0; return 0;
#endif // LIBRESSL_IN_USE #endif // LIBRESSL_LEGACY_API
case SHRPX_OPTID_CLIENT_NO_HTTP2_CIPHER_BLACK_LIST: case SHRPX_OPTID_CLIENT_NO_HTTP2_CIPHER_BLACK_LIST:
config->tls.client.no_http2_cipher_black_list = config->tls.client.no_http2_cipher_black_list =
util::strieq_l("yes", optarg); util::strieq_l("yes", optarg);

4
src/shrpx_connection.cc
View File

@ -44,13 +44,13 @@ using namespace nghttp2;
namespace shrpx { namespace shrpx {
#if !OPENSSL_1_1_API #if !LIBRESSL_2_7_API && !OPENSSL_1_1_API
void *BIO_get_data(BIO *bio) { return bio->ptr; } void *BIO_get_data(BIO *bio) { return bio->ptr; }
void BIO_set_data(BIO *bio, void *ptr) { bio->ptr = ptr; } void BIO_set_data(BIO *bio, void *ptr) { bio->ptr = ptr; }
void BIO_set_init(BIO *bio, int init) { bio->init = init; } void BIO_set_init(BIO *bio, int init) { bio->init = init; }
#endif // !OPENSSL_1_1_API #endif // !LIBRESSL_2_7_API && !OPENSSL_1_1_API
Connection::Connection(struct ev_loop *loop, int fd, SSL *ssl, Connection::Connection(struct ev_loop *loop, int fd, SSL *ssl,
MemchunkPool *mcpool, ev_tstamp write_timeout, MemchunkPool *mcpool, ev_tstamp write_timeout,

39
src/shrpx_tls.cc
View File

@ -194,7 +194,7 @@ int servername_callback(SSL *ssl, int *al, void *arg) {
const auto &ssl_ctx_list = conn_handler->get_indexed_ssl_ctx(idx); const auto &ssl_ctx_list = conn_handler->get_indexed_ssl_ctx(idx);
assert(!ssl_ctx_list.empty()); assert(!ssl_ctx_list.empty());
#if !defined(OPENSSL_IS_BORINGSSL) && !defined(LIBRESSL_VERSION_NUMBER) && \ #if !defined(OPENSSL_IS_BORINGSSL) && !LIBRESSL_IN_USE && \
OPENSSL_VERSION_NUMBER >= 0x10002000L OPENSSL_VERSION_NUMBER >= 0x10002000L
auto num_shared_curves = SSL_get_shared_curve(ssl, -1); auto num_shared_curves = SSL_get_shared_curve(ssl, -1);
@ -238,7 +238,7 @@ int servername_callback(SSL *ssl, int *al, void *arg) {
} }
} }
} }
#endif // !defined(OPENSSL_IS_BORINGSSL) && !defined(LIBRESSL_VERSION_NUMBER) && #endif // !defined(OPENSSL_IS_BORINGSSL) && !LIBRESSL_IN_USE &&
// OPENSSL_VERSION_NUMBER >= 0x10002000L // OPENSSL_VERSION_NUMBER >= 0x10002000L
SSL_set_SSL_CTX(ssl, ssl_ctx_list[0]); SSL_set_SSL_CTX(ssl, ssl_ctx_list[0]);
@ -657,7 +657,7 @@ int legacy_sct_parse_cb(SSL *ssl, unsigned int ext_type,
#endif // !OPENSSL_1_1_1_API #endif // !OPENSSL_1_1_1_API
#endif // !LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L #endif // !LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L
#if !LIBRESSL_IN_USE #ifndef OPENSSL_NO_PSK
namespace { namespace {
unsigned int psk_server_cb(SSL *ssl, const char *identity, unsigned char *psk, unsigned int psk_server_cb(SSL *ssl, const char *identity, unsigned char *psk,
unsigned int max_psk_len) { unsigned int max_psk_len) {
@ -681,9 +681,9 @@ unsigned int psk_server_cb(SSL *ssl, const char *identity, unsigned char *psk,
return static_cast<unsigned int>(secret.size()); return static_cast<unsigned int>(secret.size());
} }
} // namespace } // namespace
#endif // !LIBRESSL_IN_USE #endif // !OPENSSL_NO_PSK
#if !LIBRESSL_IN_USE #ifndef OPENSSL_NO_PSK
namespace { namespace {
unsigned int psk_client_cb(SSL *ssl, const char *hint, char *identity_out, unsigned int psk_client_cb(SSL *ssl, const char *hint, char *identity_out,
unsigned int max_identity_len, unsigned char *psk, unsigned int max_identity_len, unsigned char *psk,
@ -716,7 +716,7 @@ unsigned int psk_client_cb(SSL *ssl, const char *hint, char *identity_out,
return static_cast<unsigned int>(secret.size()); return static_cast<unsigned int>(secret.size());
} }
} // namespace } // namespace
#endif // !LIBRESSL_IN_USE #endif // !OPENSSL_NO_PSK
struct TLSProtocol { struct TLSProtocol {
StringRef name; StringRef name;
@ -794,7 +794,7 @@ SSL_CTX *create_ssl_context(const char *private_key_file, const char *cert_file,
} }
#ifndef OPENSSL_NO_EC #ifndef OPENSSL_NO_EC
#if !LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L #if !LIBRESSL_LEGACY_API && OPENSSL_VERSION_NUMBER >= 0x10002000L
if (SSL_CTX_set1_curves_list(ssl_ctx, tlsconf.ecdh_curves.c_str()) != 1) { if (SSL_CTX_set1_curves_list(ssl_ctx, tlsconf.ecdh_curves.c_str()) != 1) {
LOG(FATAL) << "SSL_CTX_set1_curves_list " << tlsconf.ecdh_curves LOG(FATAL) << "SSL_CTX_set1_curves_list " << tlsconf.ecdh_curves
<< " failed"; << " failed";
@ -805,7 +805,7 @@ SSL_CTX *create_ssl_context(const char *private_key_file, const char *cert_file,
// function was deprecated in OpenSSL 1.1.0 and BoringSSL. // function was deprecated in OpenSSL 1.1.0 and BoringSSL.
SSL_CTX_set_ecdh_auto(ssl_ctx, 1); SSL_CTX_set_ecdh_auto(ssl_ctx, 1);
#endif // !defined(OPENSSL_IS_BORINGSSL) && !OPENSSL_1_1_API #endif // !defined(OPENSSL_IS_BORINGSSL) && !OPENSSL_1_1_API
#else // LIBRESSL_IN_USE || OPENSSL_VERSION_NUBMER < 0x10002000L #else // LIBRESSL_LEGACY_API || OPENSSL_VERSION_NUBMER < 0x10002000L
// Use P-256, which is sufficiently secure at the time of this // Use P-256, which is sufficiently secure at the time of this
// writing. // writing.
auto ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); auto ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
@ -816,7 +816,7 @@ SSL_CTX *create_ssl_context(const char *private_key_file, const char *cert_file,
} }
SSL_CTX_set_tmp_ecdh(ssl_ctx, ecdh); SSL_CTX_set_tmp_ecdh(ssl_ctx, ecdh);
EC_KEY_free(ecdh); EC_KEY_free(ecdh);
#endif // LIBRESSL_IN_USE || OPENSSL_VERSION_NUBMER < 0x10002000L #endif // LIBRESSL_LEGACY_API || OPENSSL_VERSION_NUBMER < 0x10002000L
#endif // OPENSSL_NO_EC #endif // OPENSSL_NO_EC
if (!tlsconf.dh_param_file.empty()) { if (!tlsconf.dh_param_file.empty()) {
@ -966,9 +966,9 @@ SSL_CTX *create_ssl_context(const char *private_key_file, const char *cert_file,
} }
#endif // !LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L #endif // !LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L
#if !LIBRESSL_IN_USE #ifndef OPENSSL_NO_PSK
SSL_CTX_set_psk_server_callback(ssl_ctx, psk_server_cb); SSL_CTX_set_psk_server_callback(ssl_ctx, psk_server_cb);
#endif // !LIBRESSL_IN_USE #endif // !LIBRESSL_NO_PSK
auto tls_ctx_data = new TLSContextData(); auto tls_ctx_data = new TLSContextData();
tls_ctx_data->cert_file = cert_file; tls_ctx_data->cert_file = cert_file;
@ -1116,9 +1116,9 @@ SSL_CTX *create_ssl_client_context(
#endif // HAVE_NEVERBLEED #endif // HAVE_NEVERBLEED
} }
#if !LIBRESSL_IN_USE #ifndef OPENSSL_NO_PSK
SSL_CTX_set_psk_client_callback(ssl_ctx, psk_client_cb); SSL_CTX_set_psk_client_callback(ssl_ctx, psk_client_cb);
#endif // !LIBRESSL_IN_USE #endif // !OPENSSL_NO_PSK
// NPN selection callback. This is required to set SSL_CTX because // NPN selection callback. This is required to set SSL_CTX because
// OpenSSL does not offer SSL_set_next_proto_select_cb. // OpenSSL does not offer SSL_set_next_proto_select_cb.
@ -1555,16 +1555,15 @@ int cert_lookup_tree_add_ssl_ctx(
SSL_CTX *ssl_ctx) { SSL_CTX *ssl_ctx) {
std::array<uint8_t, NI_MAXHOST> buf; std::array<uint8_t, NI_MAXHOST> buf;
#if !defined(LIBRESSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER >= 0x10002000L #if LIBRESSL_2_7_API || \
(!LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L)
auto cert = SSL_CTX_get0_certificate(ssl_ctx); auto cert = SSL_CTX_get0_certificate(ssl_ctx);
#else // defined(LIBRESSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < #else // !LIBRESSL_2_7_API && OPENSSL_VERSION_NUMBER < 0x10002000L
// 0x10002000L
auto tls_ctx_data = auto tls_ctx_data =
static_cast<TLSContextData *>(SSL_CTX_get_app_data(ssl_ctx)); static_cast<TLSContextData *>(SSL_CTX_get_app_data(ssl_ctx));
auto cert = load_certificate(tls_ctx_data->cert_file); auto cert = load_certificate(tls_ctx_data->cert_file);
auto cert_deleter = defer(X509_free, cert); auto cert_deleter = defer(X509_free, cert);
#endif // defined(LIBRESSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < #endif // !LIBRESSL_2_7_API && OPENSSL_VERSION_NUMBER < 0x10002000L
// 0x10002000L
auto altnames = static_cast<GENERAL_NAMES *>( auto altnames = static_cast<GENERAL_NAMES *>(
X509_get_ext_d2i(cert, NID_subject_alt_name, nullptr, nullptr)); X509_get_ext_d2i(cert, NID_subject_alt_name, nullptr, nullptr));
@ -1852,7 +1851,7 @@ int proto_version_from_string(const StringRef &v) {
int verify_ocsp_response(SSL_CTX *ssl_ctx, const uint8_t *ocsp_resp, int verify_ocsp_response(SSL_CTX *ssl_ctx, const uint8_t *ocsp_resp,
size_t ocsp_resplen) { size_t ocsp_resplen) {
#if !defined(OPENSSL_NO_OCSP) && !defined(LIBRESSL_VERSION_NUMBER) && \ #if !defined(OPENSSL_NO_OCSP) && !LIBRESSL_IN_USE && \
OPENSSL_VERSION_NUMBER >= 0x10002000L OPENSSL_VERSION_NUMBER >= 0x10002000L
int rv; int rv;
@ -1925,7 +1924,7 @@ int verify_ocsp_response(SSL_CTX *ssl_ctx, const uint8_t *ocsp_resp,
if (LOG_ENABLED(INFO)) { if (LOG_ENABLED(INFO)) {
LOG(INFO) << "OCSP verification succeeded"; LOG(INFO) << "OCSP verification succeeded";
} }
#endif // !defined(OPENSSL_NO_OCSP) && !defined(LIBRESSL_VERSION_NUMBER) #endif // !defined(OPENSSL_NO_OCSP) && !LIBRESSL_IN_USE
// && OPENSSL_VERSION_NUMBER >= 0x10002000L // && OPENSSL_VERSION_NUMBER >= 0x10002000L
return 0; return 0;

14
src/ssl_compat.h
View File

@ -27,15 +27,17 @@
#include <openssl/opensslv.h> #include <openssl/opensslv.h>
#if defined(LIBRESSL_VERSION_NUMBER) #if defined(LIBRESSL_VERSION_NUMBER)
#define OPENSSL_1_1_API 0
#define OPENSSL_1_1_1_API 0
#define LIBRESSL_IN_USE 1 #define LIBRESSL_IN_USE 1
#define LIBRESSL_LEGACY_API (LIBRESSL_VERSION_NUMBER < 0x20700000L)
#define LIBRESSL_2_7_API (LIBRESSL_VERSION_NUMBER >= 0x20700000L)
#else // !defined(LIBRESSL_VERSION_NUMBER) #else // !defined(LIBRESSL_VERSION_NUMBER)
#define OPENSSL_1_1_API (OPENSSL_VERSION_NUMBER >= 0x1010000fL)
#define OPENSSL_1_1_1_API (OPENSSL_VERSION_NUMBER >= 0x10101000L)
#define LIBRESSL_IN_USE 0 #define LIBRESSL_IN_USE 0
#define LIBRESSL_LEGACY_API 0
#define LIBRESSL_2_7_API 0
#endif // !defined(LIBRESSL_VERSION_NUMBER) #endif // !defined(LIBRESSL_VERSION_NUMBER)
#define OPENSSL_1_1_API \
(!LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x1010000fL)
#define OPENSSL_1_1_1_API \
(!LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10101000L)
#endif // OPENSSL_COMPAT_H #endif // OPENSSL_COMPAT_H