/* $OpenBSD: myproposal.h,v 1.61 2019/11/12 19:33:08 markus Exp $ */

/*
 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef WITH_OPENSSL
#include <openssl/opensslv.h>
#endif

/* conditional algorithm support */

#ifdef OPENSSL_HAS_ECC
# ifdef OPENSSL_HAS_NISTP521
#  define KEX_ECDH_METHODS \
	"ecdh-sha2-nistp256," \
	"ecdh-sha2-nistp384," \
	"ecdh-sha2-nistp521,"
#  define HOSTKEY_ECDSA_CERT_METHODS \
	"ecdsa-sha2-nistp256-cert-v01@openssh.com," \
	"ecdsa-sha2-nistp384-cert-v01@openssh.com," \
	"ecdsa-sha2-nistp521-cert-v01@openssh.com,"
#  define HOSTKEY_ECDSA_METHODS \
	"ecdsa-sha2-nistp256," \
	"ecdsa-sha2-nistp384," \
	"ecdsa-sha2-nistp521,"
# else /* OPENSSL_HAS_NISTP521 */
#  define KEX_ECDH_METHODS \
	"ecdh-sha2-nistp256," \
	"ecdh-sha2-nistp384,"
#  define HOSTKEY_ECDSA_CERT_METHODS \
	"ecdsa-sha2-nistp256-cert-v01@openssh.com," \
	"ecdsa-sha2-nistp384-cert-v01@openssh.com,"
#  define HOSTKEY_ECDSA_METHODS \
	"ecdsa-sha2-nistp256," \
	"ecdsa-sha2-nistp384,"
# endif /* OPENSSL_HAS_NISTP521 */
# define USERKEY_ECDSA_SK_CERT_METHODS \
	"sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,"
# define USERKEY_ECDSA_SK_METHODS \
	"sk-ecdsa-sha2-nistp256@openssh.com,"
#else /* OPENSSL_HAS_ECC */
# define KEX_ECDH_METHODS
# define HOSTKEY_ECDSA_CERT_METHODS
# define HOSTKEY_ECDSA_METHODS
# define USERKEY_ECDSA_SK_CERT_METHODS
# define USERKEY_ECDSA_SK_METHODS
#endif /* OPENSSL_HAS_ECC */

#ifdef OPENSSL_HAVE_EVPGCM
# define AESGCM_CIPHER_MODES \
	",aes128-gcm@openssh.com,aes256-gcm@openssh.com"
#else
# define AESGCM_CIPHER_MODES
#endif

#ifdef HAVE_EVP_SHA256
# define KEX_SHA2_METHODS \
	"diffie-hellman-group-exchange-sha256," \
	"diffie-hellman-group16-sha512," \
	"diffie-hellman-group18-sha512,"
# define KEX_SHA2_GROUP14 \
	"diffie-hellman-group14-sha256,"
#define	SHA2_HMAC_MODES \
	"hmac-sha2-256," \
	"hmac-sha2-512,"
#else
# define KEX_SHA2_METHODS
# define KEX_SHA2_GROUP14
# define SHA2_HMAC_MODES
#endif

#ifdef WITH_OPENSSL
# ifdef HAVE_EVP_SHA256
#  define KEX_CURVE25519_METHODS \
	"curve25519-sha256," \
	"curve25519-sha256@libssh.org,"
# else
#  define KEX_CURVE25519_METHODS ""
# endif
#define KEX_SERVER_KEX \
	KEX_CURVE25519_METHODS \
	KEX_ECDH_METHODS \
	KEX_SHA2_METHODS \
	KEX_SHA2_GROUP14 \
	"diffie-hellman-group14-sha1"

#define KEX_CLIENT_KEX KEX_SERVER_KEX

#define	KEX_DEFAULT_PK_ALG	\
	HOSTKEY_ECDSA_CERT_METHODS \
	"ssh-ed25519-cert-v01@openssh.com," \
	"rsa-sha2-512-cert-v01@openssh.com," \
	"rsa-sha2-256-cert-v01@openssh.com," \
	"ssh-rsa-cert-v01@openssh.com," \
	HOSTKEY_ECDSA_METHODS \
	"ssh-ed25519," \
	"rsa-sha2-512," \
	"rsa-sha2-256," \
	"ssh-rsa"

/* the actual algorithms */

#define KEX_SERVER_ENCRYPT \
	"chacha20-poly1305@openssh.com," \
	"aes128-ctr,aes192-ctr,aes256-ctr" \
	AESGCM_CIPHER_MODES

#define KEX_CLIENT_ENCRYPT KEX_SERVER_ENCRYPT

#define KEX_SERVER_MAC \
	"umac-64-etm@openssh.com," \
	"umac-128-etm@openssh.com," \
	"hmac-sha2-256-etm@openssh.com," \
	"hmac-sha2-512-etm@openssh.com," \
	"hmac-sha1-etm@openssh.com," \
	"umac-64@openssh.com," \
	"umac-128@openssh.com," \
	"hmac-sha2-256," \
	"hmac-sha2-512," \
	"hmac-sha1"

#define KEX_CLIENT_MAC KEX_SERVER_MAC

/* Not a KEX value, but here so all the algorithm defaults are together */
#define	SSH_ALLOWED_CA_SIGALGS	\
	HOSTKEY_ECDSA_METHODS \
	"ssh-ed25519," \
	"rsa-sha2-512," \
	"rsa-sha2-256," \
	"ssh-rsa"

#define	PUBKEY_DEFAULT_PK_ALG	\
	USERKEY_ECDSA_SK_CERT_METHODS \
	HOSTKEY_ECDSA_CERT_METHODS \
	"sk-ssh-ed25519-cert-v01@openssh.com," \
	"ssh-ed25519-cert-v01@openssh.com," \
	"rsa-sha2-512-cert-v01@openssh.com," \
	"rsa-sha2-256-cert-v01@openssh.com," \
	"ssh-rsa-cert-v01@openssh.com," \
	USERKEY_ECDSA_SK_METHODS \
	HOSTKEY_ECDSA_METHODS \
	"sk-ssh-ed25519@openssh.com," \
	"ssh-ed25519," \
	"rsa-sha2-512," \
	"rsa-sha2-256," \
	"ssh-rsa"

#else /* WITH_OPENSSL */

#define KEX_SERVER_KEX		\
	"curve25519-sha256," \
	"curve25519-sha256@libssh.org"
#define	KEX_DEFAULT_PK_ALG	\
	"ssh-ed25519-cert-v01@openssh.com," \
	"ssh-ed25519"
#define PUBKEY_DEFAULT_PK_ALG KEX_DEFAULT_PK_ALG
#define	KEX_SERVER_ENCRYPT \
	"chacha20-poly1305@openssh.com," \
	"aes128-ctr,aes192-ctr,aes256-ctr"
#define	KEX_SERVER_MAC \
	"umac-64-etm@openssh.com," \
	"umac-128-etm@openssh.com," \
	"hmac-sha2-256-etm@openssh.com," \
	"hmac-sha2-512-etm@openssh.com," \
	"hmac-sha1-etm@openssh.com," \
	"umac-64@openssh.com," \
	"umac-128@openssh.com," \
	"hmac-sha2-256," \
	"hmac-sha2-512," \
	"hmac-sha1"

#define KEX_CLIENT_KEX KEX_SERVER_KEX
#define	KEX_CLIENT_ENCRYPT KEX_SERVER_ENCRYPT
#define KEX_CLIENT_MAC KEX_SERVER_MAC

#define	SSH_ALLOWED_CA_SIGALGS	"ssh-ed25519"

#endif /* WITH_OPENSSL */

#define	KEX_DEFAULT_COMP	"none,zlib@openssh.com"
#define	KEX_DEFAULT_LANG	""

#define KEX_CLIENT \
	KEX_CLIENT_KEX, \
	KEX_DEFAULT_PK_ALG, \
	KEX_CLIENT_ENCRYPT, \
	KEX_CLIENT_ENCRYPT, \
	KEX_CLIENT_MAC, \
	KEX_CLIENT_MAC, \
	KEX_DEFAULT_COMP, \
	KEX_DEFAULT_COMP, \
	KEX_DEFAULT_LANG, \
	KEX_DEFAULT_LANG

#define KEX_SERVER \
	KEX_SERVER_KEX, \
	KEX_DEFAULT_PK_ALG, \
	KEX_SERVER_ENCRYPT, \
	KEX_SERVER_ENCRYPT, \
	KEX_SERVER_MAC, \
	KEX_SERVER_MAC, \
	KEX_DEFAULT_COMP, \
	KEX_DEFAULT_COMP, \
	KEX_DEFAULT_LANG, \
	KEX_DEFAULT_LANG