1/* $OpenBSD: ssh.h,v 1.90 2020/07/14 23:57:01 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 certificate files that can be specified 23 * in configuration files or on the command line. 24 */ 25#define SSH_MAX_CERTIFICATE_FILES 100 26 27/* 28 * Maximum number of RSA authentication identity files that can be specified 29 * in configuration files or on the command line. 30 */ 31#define SSH_MAX_IDENTITY_FILES 100 32 33/* 34 * Major protocol version. Different version indicates major incompatibility 35 * that prevents communication. 36 * 37 * Minor protocol version. Different version indicates minor incompatibility 38 * that does not prevent interoperation. 39 */ 40#define PROTOCOL_MAJOR_1 1 41#define PROTOCOL_MINOR_1 5 42 43/* We support only SSH2 */ 44#define PROTOCOL_MAJOR_2 2 45#define PROTOCOL_MINOR_2 0 46 47/* 48 * Name for the service. The port named by this service overrides the 49 * default port if present. 50 */ 51#define SSH_SERVICE_NAME "ssh" 52 53/* 54 * Name of the environment variable containing the process ID of the 55 * authentication agent. 56 */ 57#define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID" 58 59/* 60 * Name of the environment variable containing the pathname of the 61 * authentication socket. 62 */ 63#define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK" 64 65/* 66 * Environment variable for overwriting the default location of askpass 67 */ 68#define SSH_ASKPASS_ENV "SSH_ASKPASS" 69 70/* 71 * Environment variable to control whether or not askpass is used. 72 */ 73#define SSH_ASKPASS_REQUIRE_ENV "SSH_ASKPASS_REQUIRE" 74 75/* 76 * Force host key length and server key length to differ by at least this 77 * many bits. This is to make double encryption with rsaref work. 78 */ 79#define SSH_KEY_BITS_RESERVED 128 80 81/* 82 * Length of the session key in bytes. (Specified as 256 bits in the 83 * protocol.) 84 */ 85#define SSH_SESSION_KEY_LENGTH 32 86 87/* Used to identify ``EscapeChar none'' */ 88#define SSH_ESCAPECHAR_NONE -2 89 90/* 91 * unprivileged user when UsePrivilegeSeparation=yes; 92 * sshd will change its privileges to this user and its 93 * primary group. 94 */ 95#ifndef SSH_PRIVSEP_USER 96#define SSH_PRIVSEP_USER "sshd" 97#endif 98 99/* Listen backlog for sshd, ssh-agent and forwarding sockets */ 100#define SSH_LISTEN_BACKLOG 128 101 102/* Limits for banner exchange */ 103#define SSH_MAX_BANNER_LEN 8192 104#define SSH_MAX_PRE_BANNER_LINES 1024 105