ssh.h revision 295367 
1/* $OpenBSD: ssh.h,v 1.81 2015/08/04 05:23:06 djm 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/* Cipher used for encrypting authentication files. */
16#define SSH_AUTHFILE_CIPHER	SSH_CIPHER_3DES
17
18/* Default port number. */
19#define SSH_DEFAULT_PORT	22
20
21/*
22 * Maximum number of RSA authentication identity files that can be specified
23 * in configuration files or on the command line.
24 */
25#define SSH_MAX_IDENTITY_FILES		100
26
27/*
28 * Maximum length of lines in authorized_keys file.
29 * Current value permits 16kbit RSA and RSA1 keys and 8kbit DSA keys, with
30 * some room for options and comments.
31 */
32#define SSH_MAX_PUBKEY_BYTES		8192
33
34/*
35 * Major protocol version.  Different version indicates major incompatibility
36 * that prevents communication.
37 *
38 * Minor protocol version.  Different version indicates minor incompatibility
39 * that does not prevent interoperation.
40 */
41#define PROTOCOL_MAJOR_1	1
42#define PROTOCOL_MINOR_1	5
43
44/* We support both SSH1 and SSH2 */
45#define PROTOCOL_MAJOR_2	2
46#define PROTOCOL_MINOR_2	0
47
48/*
49 * Name for the service.  The port named by this service overrides the
50 * default port if present.
51 */
52#define SSH_SERVICE_NAME	"ssh"
53
54/*
55 * Name of the environment variable containing the process ID of the
56 * authentication agent.
57 */
58#define SSH_AGENTPID_ENV_NAME	"SSH_AGENT_PID"
59
60/*
61 * Name of the environment variable containing the pathname of the
62 * authentication socket.
63 */
64#define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
65
66/*
67 * Environment variable for overwriting the default location of askpass
68 */
69#define SSH_ASKPASS_ENV		"SSH_ASKPASS"
70
71/*
72 * Force host key length and server key length to differ by at least this
73 * many bits.  This is to make double encryption with rsaref work.
74 */
75#define SSH_KEY_BITS_RESERVED		128
76
77/*
78 * Length of the session key in bytes.  (Specified as 256 bits in the
79 * protocol.)
80 */
81#define SSH_SESSION_KEY_LENGTH		32
82
83/* Used to identify ``EscapeChar none'' */
84#define SSH_ESCAPECHAR_NONE		-2
85
86/*
87 * unprivileged user when UsePrivilegeSeparation=yes;
88 * sshd will change its privileges to this user and its
89 * primary group.
90 */
91#ifndef SSH_PRIVSEP_USER
92#define SSH_PRIVSEP_USER		"sshd"
93#endif
94
95/* Minimum modulus size (n) for RSA keys. */
96#define SSH_RSA_MINIMUM_MODULUS_SIZE	768
97
98/* Listen backlog for sshd, ssh-agent and forwarding sockets */
99#define SSH_LISTEN_BACKLOG		128
100