Return to ssh2.h CVS log

Up to [local] / src / usr.bin / ssh

Implement Elliptic Curve Cryptography modes for key exchange (ECDH) and
host/user keys (ECDSA) as specified by RFC5656. ECDH and ECDSA offer
better performance than plain DH and DSA at the same equivalent symmetric
key length, as well as much shorter keys.

Only the mandatory sections of RFC5656 are implemented, specifically the
three REQUIRED curves nistp256, nistp384 and nistp521 and only ECDH and
ECDSA. Point compression (optional in RFC5656 is NOT implemented).

Certificate host and user keys using the new ECDSA key types are supported.

Note that this code has not been tested for interoperability and may be
subject to change.

feedback and ok markus@

/* $OpenBSD: ssh2.h,v 1.14 2010/08/31 11:54:45 djm 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.
 */

/*
 * draft-ietf-secsh-architecture-05.txt
 *
 *   Transport layer protocol:
 *
 *     1-19     Transport layer generic (e.g. disconnect, ignore, debug,
 *              etc)
 *     20-29    Algorithm negotiation
 *     30-49    Key exchange method specific (numbers can be reused for
 *              different authentication methods)
 *
 *   User authentication protocol:
 *
 *     50-59    User authentication generic
 *     60-79    User authentication method specific (numbers can be reused
 *              for different authentication methods)
 *
 *   Connection protocol:
 *
 *     80-89    Connection protocol generic
 *     90-127   Channel related messages
 *
 *   Reserved for client protocols:
 *
 *     128-191  Reserved
 *
 *   Local extensions:
 *
 *     192-255  Local extensions
 */

/* ranges */

#define SSH2_MSG_TRANSPORT_MIN				1
#define SSH2_MSG_TRANSPORT_MAX				49
#define SSH2_MSG_USERAUTH_MIN				50
#define SSH2_MSG_USERAUTH_MAX				79
#define SSH2_MSG_USERAUTH_PER_METHOD_MIN		60
#define SSH2_MSG_USERAUTH_PER_METHOD_MAX		SSH2_MSG_USERAUTH_MAX
#define SSH2_MSG_CONNECTION_MIN				80
#define SSH2_MSG_CONNECTION_MAX				127
#define SSH2_MSG_RESERVED_MIN				128
#define SSH2_MSG_RESERVED_MAX				191
#define SSH2_MSG_LOCAL_MIN				192
#define SSH2_MSG_LOCAL_MAX				255
#define SSH2_MSG_MIN					1
#define SSH2_MSG_MAX					255

/* transport layer: generic */

#define SSH2_MSG_DISCONNECT				1
#define SSH2_MSG_IGNORE					2
#define SSH2_MSG_UNIMPLEMENTED				3
#define SSH2_MSG_DEBUG					4
#define SSH2_MSG_SERVICE_REQUEST			5
#define SSH2_MSG_SERVICE_ACCEPT				6

/* transport layer: alg negotiation */

#define SSH2_MSG_KEXINIT				20
#define SSH2_MSG_NEWKEYS				21

/* transport layer: kex specific messages, can be reused */

#define SSH2_MSG_KEXDH_INIT				30
#define SSH2_MSG_KEXDH_REPLY				31

/* dh-group-exchange */
#define SSH2_MSG_KEX_DH_GEX_REQUEST_OLD			30
#define SSH2_MSG_KEX_DH_GEX_GROUP			31
#define SSH2_MSG_KEX_DH_GEX_INIT			32
#define SSH2_MSG_KEX_DH_GEX_REPLY			33
#define SSH2_MSG_KEX_DH_GEX_REQUEST			34

/* ecdh */
#define SSH2_MSG_KEX_ECDH_INIT				30
#define SSH2_MSG_KEX_ECDH_REPLY				31

/* user authentication: generic */

#define SSH2_MSG_USERAUTH_REQUEST			50
#define SSH2_MSG_USERAUTH_FAILURE			51
#define SSH2_MSG_USERAUTH_SUCCESS			52
#define SSH2_MSG_USERAUTH_BANNER			53

/* user authentication: method specific, can be reused */

#define SSH2_MSG_USERAUTH_PK_OK				60
#define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ		60
#define SSH2_MSG_USERAUTH_INFO_REQUEST			60
#define SSH2_MSG_USERAUTH_INFO_RESPONSE			61
#define SSH2_MSG_USERAUTH_JPAKE_CLIENT_STEP1		60
#define SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP1		61
#define SSH2_MSG_USERAUTH_JPAKE_CLIENT_STEP2		62
#define SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP2		63
#define SSH2_MSG_USERAUTH_JPAKE_CLIENT_CONFIRM		64
#define SSH2_MSG_USERAUTH_JPAKE_SERVER_CONFIRM		65

/* connection protocol: generic */

#define SSH2_MSG_GLOBAL_REQUEST				80
#define SSH2_MSG_REQUEST_SUCCESS			81
#define SSH2_MSG_REQUEST_FAILURE			82

/* channel related messages */

#define SSH2_MSG_CHANNEL_OPEN				90
#define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION		91
#define SSH2_MSG_CHANNEL_OPEN_FAILURE			92
#define SSH2_MSG_CHANNEL_WINDOW_ADJUST			93
#define SSH2_MSG_CHANNEL_DATA				94
#define SSH2_MSG_CHANNEL_EXTENDED_DATA			95
#define SSH2_MSG_CHANNEL_EOF				96
#define SSH2_MSG_CHANNEL_CLOSE				97
#define SSH2_MSG_CHANNEL_REQUEST			98
#define SSH2_MSG_CHANNEL_SUCCESS			99
#define SSH2_MSG_CHANNEL_FAILURE			100

/* disconnect reason code */

#define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT	1
#define SSH2_DISCONNECT_PROTOCOL_ERROR			2
#define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED		3
#define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED	4
#define SSH2_DISCONNECT_RESERVED			4
#define SSH2_DISCONNECT_MAC_ERROR			5
#define SSH2_DISCONNECT_COMPRESSION_ERROR		6
#define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE		7
#define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED	8
#define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE		9
#define SSH2_DISCONNECT_CONNECTION_LOST			10
#define SSH2_DISCONNECT_BY_APPLICATION			11
#define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS		12
#define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER		13
#define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE	14
#define SSH2_DISCONNECT_ILLEGAL_USER_NAME		15

/* misc */

#define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED		1
#define SSH2_OPEN_CONNECT_FAILED			2
#define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE			3
#define SSH2_OPEN_RESOURCE_SHORTAGE			4

#define SSH2_EXTENDED_DATA_STDERR			1

/* kex messages for resume@appgate.com */
#define SSH2_MSG_KEX_ROAMING_RESUME			30
#define SSH2_MSG_KEX_ROAMING_AUTH_REQUIRED		31
#define SSH2_MSG_KEX_ROAMING_AUTH			32
#define SSH2_MSG_KEX_ROAMING_AUTH_OK			33
#define SSH2_MSG_KEX_ROAMING_AUTH_FAIL			34

/* Certificate types for OpenSSH certificate keys extension */
#define SSH2_CERT_TYPE_USER				1
#define SSH2_CERT_TYPE_HOST				2