ssh.h revision 147005 
1/*	$OpenBSD: ssh.h,v 1.76 2004/12/06 11:41:03 dtucker 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#ifndef SSH_H
16#define SSH_H
17
18#include <netinet/in.h> /* For struct sockaddr_in */
19#include <pwd.h> /* For struct pw */
20#include <stdarg.h> /* For va_list */
21#include <syslog.h> /* For LOG_AUTH and friends */
22#include <sys/socket.h> /* For struct sockaddr_storage */
23#ifdef HAVE_SYS_SELECT_H
24# include <sys/select.h>
25#endif
26
27/* Cipher used for encrypting authentication files. */
28#define SSH_AUTHFILE_CIPHER	SSH_CIPHER_3DES
29
30/* Default port number. */
31#define SSH_DEFAULT_PORT	22
32
33/* Maximum number of TCP/IP ports forwarded per direction. */
34#define SSH_MAX_FORWARDS_PER_DIRECTION	100
35
36/*
37 * Maximum number of RSA authentication identity files that can be specified
38 * in configuration files or on the command line.
39 */
40#define SSH_MAX_IDENTITY_FILES		100
41
42/*
43 * Maximum length of lines in authorized_keys file.
44 * Current value permits 16kbit RSA and RSA1 keys and 8kbit DSA keys, with
45 * some room for options and comments.
46 */
47#define SSH_MAX_PUBKEY_BYTES		8192
48
49/*
50 * Major protocol version.  Different version indicates major incompatibility
51 * that prevents communication.
52 *
53 * Minor protocol version.  Different version indicates minor incompatibility
54 * that does not prevent interoperation.
55 */
56#define PROTOCOL_MAJOR_1	1
57#define PROTOCOL_MINOR_1	5
58
59/* We support both SSH1 and SSH2 */
60#define PROTOCOL_MAJOR_2	2
61#define PROTOCOL_MINOR_2	0
62
63/*
64 * Name for the service.  The port named by this service overrides the
65 * default port if present.
66 */
67#define SSH_SERVICE_NAME	"ssh"
68
69/*
70 * Name of the environment variable containing the process ID of the
71 * authentication agent.
72 */
73#define SSH_AGENTPID_ENV_NAME	"SSH_AGENT_PID"
74
75/*
76 * Name of the environment variable containing the pathname of the
77 * authentication socket.
78 */
79#define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
80
81/*
82 * Environment variable for overwriting the default location of askpass
83 */
84#define SSH_ASKPASS_ENV		"SSH_ASKPASS"
85
86/*
87 * Force host key length and server key length to differ by at least this
88 * many bits.  This is to make double encryption with rsaref work.
89 */
90#define SSH_KEY_BITS_RESERVED		128
91
92/*
93 * Length of the session key in bytes.  (Specified as 256 bits in the
94 * protocol.)
95 */
96#define SSH_SESSION_KEY_LENGTH		32
97
98/* Used to identify ``EscapeChar none'' */
99#define SSH_ESCAPECHAR_NONE		-2
100
101/*
102 * unprivileged user when UsePrivilegeSeparation=yes;
103 * sshd will change its privileges to this user and its
104 * primary group.
105 */
106#ifndef SSH_PRIVSEP_USER
107#define SSH_PRIVSEP_USER		"sshd"
108#endif
109
110/* Minimum modulus size (n) for RSA keys. */
111#define SSH_RSA_MINIMUM_MODULUS_SIZE	768
112
113/* Listen backlog for sshd, ssh-agent and forwarding sockets */
114#define SSH_LISTEN_BACKLOG		128
115
116#endif				/* SSH_H */
117