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1/* $OpenBSD: ssh.h,v 1.91 2024/09/25 23:01:39 jsg Exp $ */
2
3/*
4 * Author: Tatu Ylonen <ylo@cs.hut.fi>
5 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * All rights reserved
7 *
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 */
14
15/* Default port number. */
16#define SSH_DEFAULT_PORT 22
17
18/*
19 * Maximum number of certificate files that can be specified
20 * in configuration files or on the command line.
21 */
22#define SSH_MAX_CERTIFICATE_FILES 100
23
24/*
25 * Maximum number of RSA authentication identity files that can be specified
26 * in configuration files or on the command line.
27 */
28#define SSH_MAX_IDENTITY_FILES 100
29
30/*
31 * Major protocol version. Different version indicates major incompatibility
32 * that prevents communication.
33 *
34 * Minor protocol version. Different version indicates minor incompatibility
35 * that does not prevent interoperation.
36 *
37 * We support only SSH2
38 */
39#define PROTOCOL_MAJOR_2 2
40#define PROTOCOL_MINOR_2 0
41
42/*
43 * Name for the service. The port named by this service overrides the
44 * default port if present.
45 */
46#define SSH_SERVICE_NAME "ssh"
47
48/*
49 * Name of the environment variable containing the process ID of the
50 * authentication agent.
51 */
52#define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID"
53
54/*
55 * Name of the environment variable containing the pathname of the
56 * authentication socket.
57 */
58#define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
59
60/*
61 * Environment variable for overwriting the default location of askpass
62 */
63#define SSH_ASKPASS_ENV "SSH_ASKPASS"
64
65/*
66 * Environment variable to control whether or not askpass is used.
67 */
68#define SSH_ASKPASS_REQUIRE_ENV "SSH_ASKPASS_REQUIRE"
69
70/*
71 * Length of the session key in bytes. (Specified as 256 bits in the
72 * protocol.)
73 */
74#define SSH_SESSION_KEY_LENGTH 32
75
76/* Used to identify ``EscapeChar none'' */
77#define SSH_ESCAPECHAR_NONE -2
78
79/*
80 * unprivileged user when UsePrivilegeSeparation=yes;
81 * sshd will change its privileges to this user and its
82 * primary group.
83 */
84#define SSH_PRIVSEP_USER "sshd"
85
86/* Listen backlog for sshd, ssh-agent and forwarding sockets */
87#define SSH_LISTEN_BACKLOG 128
88
89/* Limits for banner exchange */
90#define SSH_MAX_BANNER_LEN 8192
91#define SSH_MAX_PRE_BANNER_LINES 1024