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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* 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.
*/
#ifndef TLS_H
#define TLS_H
#include "nghttp2_config.h"
#include <cinttypes>
#include <openssl/ssl.h>
#include "ssl_compat.h"
namespace nghttp2 {
namespace tls {
// Recommended general purpose "Intermediate compatibility" cipher
// suites for TLSv1.2 by mozilla.
//
// https://wiki.mozilla.org/Security/Server_Side_TLS
constexpr char DEFAULT_CIPHER_LIST[] =
"ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-"
"AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-"
"POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-"
"AES256-GCM-SHA384";
// Recommended general purpose "Modern compatibility" cipher suites
// for TLSv1.3 by mozilla.
//
// https://wiki.mozilla.org/Security/Server_Side_TLS
constexpr char DEFAULT_TLS13_CIPHER_LIST[] =
#if defined(NGHTTP2_GENUINE_OPENSSL) || defined(NGHTTP2_OPENSSL_IS_LIBRESSL)
"TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256"
#else // !NGHTTP2_GENUINE_OPENSSL && !NGHTTP2_OPENSSL_IS_LIBRESSL
""
#endif // !NGHTTP2_GENUINE_OPENSSL && !NGHTTP2_OPENSSL_IS_LIBRESSL
;
constexpr auto NGHTTP2_TLS_MIN_VERSION = TLS1_VERSION;
#ifdef TLS1_3_VERSION
constexpr auto NGHTTP2_TLS_MAX_VERSION = TLS1_3_VERSION;
#else // !TLS1_3_VERSION
constexpr auto NGHTTP2_TLS_MAX_VERSION = TLS1_2_VERSION;
#endif // !TLS1_3_VERSION
const char *get_tls_protocol(SSL *ssl);
struct TLSSessionInfo {
const char *cipher;
const char *protocol;
const uint8_t *session_id;
bool session_reused;
size_t session_id_length;
};
TLSSessionInfo *get_tls_session_info(TLSSessionInfo *tls_info, SSL *ssl);
// Returns true iff the negotiated protocol is TLSv1.2.
bool check_http2_tls_version(SSL *ssl);
// Returns true iff the negotiated cipher suite is in HTTP/2 cipher
// block list.
bool check_http2_cipher_block_list(SSL *ssl);
// Returns true if SSL/TLS requirement for HTTP/2 is fulfilled.
// To fulfill the requirement, the following 2 terms must be hold:
//
// 1. The negotiated protocol must be TLSv1.2.
// 2. The negotiated cipher cuite is not listed in the block list
// described in RFC 7540.
bool check_http2_requirement(SSL *ssl);
// Sets TLS min and max versions to |ssl_ctx|. This function returns
// 0 if it succeeds, or -1.
int ssl_ctx_set_proto_versions(SSL_CTX *ssl_ctx, int min, int max);
} // namespace tls
} // namespace nghttp2
#endif // TLS_H
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