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OpenSSH 6.5 and 6.6 have a bug that causes ~0.2% of connections
using the curve25519-sha256@libssh.org KEX exchange method to fail
when connecting with something that implements the spec properly.

Disable this KEX method when speaking to one of the affected
versions.

reported by Aris Adamantiadis; ok markus@

/* $OpenBSD: compat.h,v 1.45 2014/04/18 23:52:25 djm Exp $ */

/*
 * Copyright (c) 1999, 2000, 2001 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.
 */

#ifndef COMPAT_H
#define COMPAT_H

#define	SSH_PROTO_UNKNOWN	0x00
#define	SSH_PROTO_1		0x01
#define	SSH_PROTO_1_PREFERRED	0x02
#define	SSH_PROTO_2		0x04

#define SSH_BUG_SIGBLOB		0x00000001
#define SSH_BUG_PKSERVICE	0x00000002
#define SSH_BUG_HMAC		0x00000004
#define SSH_BUG_X11FWD		0x00000008
#define SSH_OLD_SESSIONID	0x00000010
#define SSH_BUG_PKAUTH		0x00000020
#define SSH_BUG_DEBUG		0x00000040
#define SSH_BUG_BANNER		0x00000080
#define SSH_BUG_IGNOREMSG	0x00000100
#define SSH_BUG_PKOK		0x00000200
#define SSH_BUG_PASSWORDPAD	0x00000400
#define SSH_BUG_SCANNER		0x00000800
#define SSH_BUG_BIGENDIANAES	0x00001000
#define SSH_BUG_RSASIGMD5	0x00002000
#define SSH_OLD_DHGEX		0x00004000
#define SSH_BUG_NOREKEY		0x00008000
#define SSH_BUG_HBSERVICE	0x00010000
#define SSH_BUG_OPENFAILURE	0x00020000
#define SSH_BUG_DERIVEKEY	0x00040000
#define SSH_BUG_DUMMYCHAN	0x00100000
#define SSH_BUG_EXTEOF		0x00200000
#define SSH_BUG_PROBE		0x00400000
#define SSH_BUG_FIRSTKEX	0x00800000
#define SSH_OLD_FORWARD_ADDR	0x01000000
#define SSH_BUG_RFWD_ADDR	0x02000000
#define SSH_NEW_OPENSSH		0x04000000
#define SSH_BUG_DYNAMIC_RPORT	0x08000000
#define SSH_BUG_CURVE25519PAD	0x10000000

void     enable_compat13(void);
void     enable_compat20(void);
void     compat_datafellows(const char *);
int	 proto_spec(const char *);
char	*compat_cipher_proposal(char *);
char	*compat_pkalg_proposal(char *);
char	*compat_kex_proposal(char *);

extern int compat13;
extern int compat20;
extern int datafellows;
#endif