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/*
* ProFTPD - mod_proxy TLS API
* Copyright (c) 2015-2024 TJ Saunders
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, TJ Saunders and other respective copyright holders
* give permission to link this program with OpenSSL, and distribute the
* resulting executable, without including the source code for OpenSSL in the
* source distribution.
*/
#ifndef MOD_PROXY_TLS_H
#define MOD_PROXY_TLS_H
#include "mod_proxy.h"
#include "proxy/session.h"
#ifdef PR_USE_OPENSSL
# include <openssl/bio.h>
# include <openssl/err.h>
# include <openssl/conf.h>
# include <openssl/crypto.h>
# include <openssl/evp.h>
# include <openssl/ssl.h>
# include <openssl/ssl3.h>
# include <openssl/x509v3.h>
# include <openssl/rand.h>
# if OPENSSL_VERSION_NUMBER > 0x000907000L
# if defined(PR_USE_OPENSSL_ENGINE)
# include <openssl/engine.h>
# endif /* PR_USE_OPENSSL_ENGINE */
# include <openssl/ocsp.h>
# endif
# ifdef PR_USE_OPENSSL_ECC
# include <openssl/ec.h>
# include <openssl/ecdh.h>
# endif /* PR_USE_OPENSSL_ECC */
#endif
/* ProxyTLSEngine values */
#define PROXY_TLS_ENGINE_ON 1
#define PROXY_TLS_ENGINE_OFF 2
#define PROXY_TLS_ENGINE_AUTO 3
#define PROXY_TLS_ENGINE_IMPLICIT 4
#define PROXY_TLS_ENGINE_MATCH_CLIENT 5
#define PROXY_TLS_IMPLICIT_FTPS_PORT 990
/* ProxyTLSOptions values. NOTE: Make sure these do NOT collide with existing
* PROXY_OPT_ values defined in mod_proxy.h.
*/
#define PROXY_TLS_OPT_ENABLE_DIAGS 0x0100
#define PROXY_TLS_OPT_NO_SESSION_CACHE 0x0200
#define PROXY_TLS_OPT_NO_SESSION_TICKETS 0x0400
#define PROXY_TLS_OPT_ALLOW_WEAK_SECURITY 0x0800
/* ProxyTLSProtocol handling */
#define PROXY_TLS_PROTO_SSL_V3 0x0001
#define PROXY_TLS_PROTO_TLS_V1 0x0002
#define PROXY_TLS_PROTO_TLS_V1_1 0x0004
#define PROXY_TLS_PROTO_TLS_V1_2 0x0008
#define PROXY_TLS_PROTO_TLS_V1_3 0x0010
#if defined(PR_USE_OPENSSL) && \
OPENSSL_VERSION_NUMBER >= 0x10001000L
# if defined(TLS1_3_VERSION)
# define PROXY_TLS_PROTO_DEFAULT (PROXY_TLS_PROTO_TLS_V1|PROXY_TLS_PROTO_TLS_V1_1|PROXY_TLS_PROTO_TLS_V1_2|PROXY_TLS_PROTO_TLS_V1_3)
# else
# define PROXY_TLS_PROTO_DEFAULT (PROXY_TLS_PROTO_TLS_V1|PROXY_TLS_PROTO_TLS_V1_1|PROXY_TLS_PROTO_TLS_V1_2)
# endif /* TLS1_3_VERSION */
#else
# define PROXY_TLS_PROTO_DEFAULT (PROXY_TLS_PROTO_TLS_V1)
#endif /* OpenSSL 1.0.1 or later */
/* This is used for e.g. "ProxyTLSProtocol ALL -SSLv3 ...". */
#define PROXY_TLS_PROTO_ALL (PROXY_TLS_PROTO_SSL_V3|PROXY_TLS_PROTO_TLS_V1|PROXY_TLS_PROTO_TLS_V1_1|PROXY_TLS_PROTO_TLS_V1_2|PROXY_TLS_PROTO_TLS_V1_3)
const char *proxy_tls_get_errors(void);
int proxy_tls_init(pool *p, const char *tables_dir, int flags);
int proxy_tls_free(pool *p);
int proxy_tls_sess_init(pool *p, struct proxy_session *proxy_sess, int flags);
int proxy_tls_sess_free(pool *p);
/* Set whether data transfers require TLS protection, based on e.g. clients'
* PROT commands.
*/
int proxy_tls_set_data_prot(int);
/* Programmatically set the ProxyTLSEngine value. */
int proxy_tls_set_tls(int);
/* Returns the ProxyTLSEngine value; see above. */
int proxy_tls_using_tls(void);
/* Implements the ProxyTLSEngine MatchClient functionality. */
int proxy_tls_match_client_tls(void);
/* Defines the datastore interface. */
struct proxy_tls_datastore {
#ifdef PR_USE_OPENSSL
int (*add_sess)(pool *p, void *dsh, const char *key, SSL_SESSION *sess);
int (*remove_sess)(pool *p, void *dsh, const char *key);
SSL_SESSION *(*get_sess)(pool *p, void *dsh, const char *key);
int (*count_sess)(pool *p, void *dsh);
#endif /* PR_USE_OPENSSL */
int (*init)(pool *p, const char *path, int flags);
void *(*open)(pool *p, const char *path, unsigned long opts);
int (*close)(pool *p, void *dsh);
/* Datastore handle returned by the open callback. */
void *dsh;
};
#endif /* MOD_PROXY_TLS_H */
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