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1/* $OpenBSD: ssh2.h,v 1.22 2023/10/10 03:57:45 djm Exp $ */
2
3/*
4 * Copyright (c) 2000 Markus Friedl. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27/*
28 * RFC4251:
29 *
30 * Transport layer protocol:
31 *
32 * 1-19 Transport layer generic (e.g. disconnect, ignore, debug,
33 * etc)
34 * 20-29 Algorithm negotiation
35 * 30-49 Key exchange method specific (numbers can be reused for
36 * different authentication methods)
37 *
38 * User authentication protocol:
39 *
40 * 50-59 User authentication generic
41 * 60-79 User authentication method specific (numbers can be reused
42 * for different authentication methods)
43 *
44 * Connection protocol:
45 *
46 * 80-89 Connection protocol generic
47 * 90-127 Channel related messages
48 *
49 * Reserved for client protocols:
50 *
51 * 128-191 Reserved
52 *
53 * Local extensions:
54 *
55 * 192-255 Local extensions
56 * 248-255 Local extensions (OpenSSH will never use numbers in this range)
57 */
58
59/* special marker for no message */
60
61#define SSH_MSG_NONE 0
62
63/* ranges */
64
65#define SSH2_MSG_TRANSPORT_MIN 1
66#define SSH2_MSG_TRANSPORT_MAX 49
67#define SSH2_MSG_USERAUTH_MIN 50
68#define SSH2_MSG_USERAUTH_MAX 79
69#define SSH2_MSG_USERAUTH_PER_METHOD_MIN 60
70#define SSH2_MSG_USERAUTH_PER_METHOD_MAX SSH2_MSG_USERAUTH_MAX
71#define SSH2_MSG_CONNECTION_MIN 80
72#define SSH2_MSG_CONNECTION_MAX 127
73#define SSH2_MSG_RESERVED_MIN 128
74#define SSH2_MSG_RESERVED_MAX 191
75#define SSH2_MSG_LOCAL_MIN 192
76#define SSH2_MSG_LOCAL_MAX 255
77#define SSH2_MSG_MIN 1
78#define SSH2_MSG_MAX 255
79
80/* transport layer: generic */
81
82#define SSH2_MSG_DISCONNECT 1
83#define SSH2_MSG_IGNORE 2
84#define SSH2_MSG_UNIMPLEMENTED 3
85#define SSH2_MSG_DEBUG 4
86#define SSH2_MSG_SERVICE_REQUEST 5
87#define SSH2_MSG_SERVICE_ACCEPT 6
88#define SSH2_MSG_EXT_INFO 7
89#define SSH2_MSG_NEWCOMPRESS 8
90
91/* transport layer: alg negotiation */
92
93#define SSH2_MSG_KEXINIT 20
94#define SSH2_MSG_NEWKEYS 21
95
96/* transport layer: kex specific messages, can be reused */
97
98#define SSH2_MSG_KEXDH_INIT 30
99#define SSH2_MSG_KEXDH_REPLY 31
100
101/* dh-group-exchange */
102#define SSH2_MSG_KEX_DH_GEX_REQUEST_OLD 30
103#define SSH2_MSG_KEX_DH_GEX_GROUP 31
104#define SSH2_MSG_KEX_DH_GEX_INIT 32
105#define SSH2_MSG_KEX_DH_GEX_REPLY 33
106#define SSH2_MSG_KEX_DH_GEX_REQUEST 34
107
108/* ecdh */
109#define SSH2_MSG_KEX_ECDH_INIT 30
110#define SSH2_MSG_KEX_ECDH_REPLY 31
111
112/* transport layer: OpenSSH extensions */
113#define SSH2_MSG_PING 192
114#define SSH2_MSG_PONG 193
115
116/* user authentication: generic */
117
118#define SSH2_MSG_USERAUTH_REQUEST 50
119#define SSH2_MSG_USERAUTH_FAILURE 51
120#define SSH2_MSG_USERAUTH_SUCCESS 52
121#define SSH2_MSG_USERAUTH_BANNER 53
122
123/* user authentication: method specific, can be reused */
124
125#define SSH2_MSG_USERAUTH_PK_OK 60
126#define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60
127#define SSH2_MSG_USERAUTH_INFO_REQUEST 60
128#define SSH2_MSG_USERAUTH_INFO_RESPONSE 61
129
130/* connection protocol: generic */
131
132#define SSH2_MSG_GLOBAL_REQUEST 80
133#define SSH2_MSG_REQUEST_SUCCESS 81
134#define SSH2_MSG_REQUEST_FAILURE 82
135
136/* channel related messages */
137
138#define SSH2_MSG_CHANNEL_OPEN 90
139#define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91
140#define SSH2_MSG_CHANNEL_OPEN_FAILURE 92
141#define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93
142#define SSH2_MSG_CHANNEL_DATA 94
143#define SSH2_MSG_CHANNEL_EXTENDED_DATA 95
144#define SSH2_MSG_CHANNEL_EOF 96
145#define SSH2_MSG_CHANNEL_CLOSE 97
146#define SSH2_MSG_CHANNEL_REQUEST 98
147#define SSH2_MSG_CHANNEL_SUCCESS 99
148#define SSH2_MSG_CHANNEL_FAILURE 100
149
150/* disconnect reason code */
151
152#define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1
153#define SSH2_DISCONNECT_PROTOCOL_ERROR 2
154#define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3
155#define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4
156#define SSH2_DISCONNECT_RESERVED 4
157#define SSH2_DISCONNECT_MAC_ERROR 5
158#define SSH2_DISCONNECT_COMPRESSION_ERROR 6
159#define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7
160#define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8
161#define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9
162#define SSH2_DISCONNECT_CONNECTION_LOST 10
163#define SSH2_DISCONNECT_BY_APPLICATION 11
164#define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS 12
165#define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER 13
166#define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE 14
167#define SSH2_DISCONNECT_ILLEGAL_USER_NAME 15
168
169/* misc */
170
171#define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1
172#define SSH2_OPEN_CONNECT_FAILED 2
173#define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3
174#define SSH2_OPEN_RESOURCE_SHORTAGE 4
175
176#define SSH2_EXTENDED_DATA_STDERR 1
177
178/* Certificate types for OpenSSH certificate keys extension */
179#define SSH2_CERT_TYPE_USER 1
180#define SSH2_CERT_TYPE_HOST 2