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/*
* ProFTPD - mod_proxy SSH interop API
* Copyright (c) 2021 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_SSH_INTEROP_H
#define MOD_PROXY_SSH_INTEROP_H
#include "mod_proxy.h"
#include "proxy/session.h"
#if defined(PR_USE_OPENSSL)
/* For servers which do not support IGNORE packets */
#define PROXY_SSH_FEAT_IGNORE_MSG 0x0001
/* For servers which always truncate the HMAC len to 16 bits, regardless
* of the actual HMAC len.
*/
#define PROXY_SSH_FEAT_MAC_LEN 0x0002
/* For servers which do not include K when deriving cipher keys. */
#define PROXY_SSH_FEAT_CIPHER_USE_K 0x0004
/* For servers which do not support rekeying */
#define PROXY_SSH_FEAT_REKEYING 0x0008
/* For servers which do not support USERAUTH_BANNER packets */
#define PROXY_SSH_FEAT_USERAUTH_BANNER 0x0010
/* For servers which do not send a string indicating the public key
* algorithm in their publickey authentication requests. This also
* includes servers which do not use the string "publickey", and the
* string for the public key algorithm, in the public key signature
* (as dictated by Section 7 of RFC4252).
*/
#define PROXY_SSH_FEAT_HAVE_PUBKEY_ALGO 0x0020
/* For servers whose publickey signatures always use a service name of
* "ssh-userauth", regardless of the actual service name included in the
* USERAUTH_REQUEST packet.
*/
#define PROXY_SSH_FEAT_SERVICE_IN_PUBKEY_SIG 0x0040
/* For servers whose DSA publickey signatures do not include the string
* "ssh-dss".
*/
#define PROXY_SSH_FEAT_HAVE_PUBKEY_ALGO_IN_DSA_SIG 0x0080
/* For servers whose hostbased signatures always use a service name of
* "ssh-userauth", regardless of the actual service name included in the
* USERAUTH_REQUEST packet.
*/
#define PROXY_SSH_FEAT_SERVICE_IN_HOST_SIG 0x0100
/* For servers that want the client to pessimistically send its NEWKEYS message
* after they send their NEWKEYS message.
*/
#define PROXY_SSH_FEAT_PESSIMISTIC_NEWKEYS 0x0200
/* For servers which cannot/do not tolerate non-kex related packets after a
* client has requested rekeying.
*/
#define PROXY_SSH_FEAT_NO_DATA_WHILE_REKEYING 0x0400
/* For servers which do not support/implement RFC 4419 DH group exchange. */
#define PROXY_SSH_FEAT_DH_NEW_GEX 0x0800
/* Compares the given server version string against a table of known server
* versions and their interoperability/compatibility issues.
*/
int proxy_ssh_interop_handle_version(pool *, const struct proxy_session *,
const char *);
/* Returns TRUE if the server supports the requested feature, FALSE
* otherwise.
*/
int proxy_ssh_interop_supports_feature(int);
int proxy_ssh_interop_init(void);
int proxy_ssh_interop_free(void);
#endif /* PR_USE_OPENSSL */
#endif /* MOD_PROXY_SSH_INTEROP_H */
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