#ifndef HEADER_CURL_SSLUSE_H
#define HEADER_CURL_SSLUSE_H
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * SPDX-License-Identifier: curl
 *
 ***************************************************************************/
#include "curl_setup.h"

#ifdef USE_OPENSSL
/*
 * This header should only be needed to get included by vtls.c, openssl.c
 * and ngtcp2.c
 */
#include <openssl/opensslv.h>
#include <openssl/ossl_typ.h>
#include <openssl/ssl.h>

#include "urldata.h"

#if OPENSSL_VERSION_NUMBER >= 0x30000000L
#define HAVE_OPENSSL3  /* non-fork OpenSSL 3.x or later */
#endif

#if defined(OPENSSL_IS_BORINGSSL) || defined(OPENSSL_IS_AWSLC)
#define HAVE_BORINGSSL_LIKE
#endif

/* OpenSSL 3.5.0+ has built-in 'SSLKEYLOGFILE' support if built with
   'enable-sslkeylog' */
#if OPENSSL_VERSION_NUMBER >= 0x30500000L && !defined(OPENSSL_NO_SSLKEYLOG)
#define HAVE_KEYLOG_UPSTREAM
#endif

/*
 * Whether SSL_CTX_set_keylog_callback is available.
 * OpenSSL: supported since 1.1.1 https://github.com/openssl/openssl/pull/2287
 * BoringSSL: supported since d28f59c27bac (committed 2015-11-19)
 * LibreSSL: not supported. 3.5.0+ has a stub function that does nothing.
 */
#ifndef LIBRESSL_VERSION_NUMBER
#define HAVE_KEYLOG_CALLBACK
#endif

/* Check for OpenSSL 1.1.1 which has early data support. */
#undef HAVE_OPENSSL_EARLYDATA
#if defined(TLS1_3_VERSION) && !defined(HAVE_BORINGSSL_LIKE)
#define HAVE_OPENSSL_EARLYDATA
#endif

struct alpn_spec;
struct ssl_peer;
struct Curl_ssl_session;

/* Struct to hold a curl OpenSSL instance */
struct ossl_ctx {
  /* these ones requires specific SSL-types */
  SSL_CTX* ssl_ctx;
  SSL*     ssl;
  BIO_METHOD *bio_method;
  CURLcode io_result;       /* result of last BIO cfilter operation */
  /* blocked writes need to retry with same length, remember it */
  int      blocked_ssl_write_len;
#if !defined(HAVE_KEYLOG_UPSTREAM) && !defined(HAVE_KEYLOG_CALLBACK)
  /* Set to true once a valid keylog entry has been created to avoid dupes.
     This is a bool and not a bitfield because it is passed by address. */
  bool keylog_done;
#endif
  BIT(x509_store_setup);            /* x509 store has been set up */
  BIT(store_is_empty);              /* no certs/paths/blobs in x509 store */
  BIT(reused_session);              /* session-ID was reused for this */
};

size_t Curl_ossl_version(char *buffer, size_t size);

typedef CURLcode Curl_ossl_ctx_setup_cb(struct Curl_cfilter *cf,
                                        struct Curl_easy *data,
                                        void *user_data);

typedef int Curl_ossl_new_session_cb(SSL *ssl, SSL_SESSION *ssl_sessionid);
typedef CURLcode Curl_ossl_init_session_reuse_cb(struct Curl_cfilter *cf,
                                                 struct Curl_easy *data,
                                                 struct alpn_spec *alpns,
                                                 struct Curl_ssl_session *scs,
                                                 bool *do_early_data);

CURLcode Curl_ossl_ctx_init(struct ossl_ctx *octx,
                            struct Curl_cfilter *cf,
                            struct Curl_easy *data,
                            struct ssl_peer *peer,
                            const struct alpn_spec *alpns_requested,
                            Curl_ossl_ctx_setup_cb *cb_setup,
                            void *cb_user_data,
                            Curl_ossl_new_session_cb *cb_new_session,
                            void *ssl_user_data,
                            Curl_ossl_init_session_reuse_cb *sess_reuse_cb);

#ifndef HAVE_OPENSSL3
#define SSL_get1_peer_certificate SSL_get_peer_certificate
#endif

extern const struct Curl_ssl Curl_ssl_openssl;

/**
 * Setup the OpenSSL X509_STORE in `ssl_ctx` for the cfilter `cf` and
 * easy handle `data`. Will allow reuse of a shared cache if suitable
 * and configured.
 */
CURLcode Curl_ssl_setup_x509_store(struct Curl_cfilter *cf,
                                   struct Curl_easy *data,
                                   struct ossl_ctx *octx);

CURLcode Curl_ossl_ctx_configure(struct Curl_cfilter *cf,
                                 struct Curl_easy *data,
                                 SSL_CTX *ssl_ctx);

/*
 * Add a new session to the cache. Takes ownership of the session.
 */
CURLcode Curl_ossl_add_session(struct Curl_cfilter *cf,
                               struct Curl_easy *data,
                               const char *ssl_peer_key,
                               SSL_SESSION *session,
                               int ietf_tls_id,
                               const char *alpn,
                               unsigned char *quic_tp,
                               size_t quic_tp_len);

/*
 * Get the server cert, verify it and show it, etc., only call failf() if
 * ssl config verifypeer or -host is set. Otherwise all this is for
 * informational purposes only!
 */
CURLcode Curl_ossl_check_peer_cert(struct Curl_cfilter *cf,
                                   struct Curl_easy *data,
                                   struct ossl_ctx *octx,
                                   struct ssl_peer *peer);

/* Report properties of a successful handshake */
void Curl_ossl_report_handshake(struct Curl_easy *data, struct ossl_ctx *octx);

#endif /* USE_OPENSSL */
#endif /* HEADER_CURL_SSLUSE_H */
