1 /* $NetBSD: ssh.h,v 1.13 2020/12/04 18:42:50 christos Exp $ */ 2 /* $OpenBSD: ssh.h,v 1.90 2020/07/14 23:57:01 djm Exp $ */ 3 4 /* 5 * Author: Tatu Ylonen <ylo@cs.hut.fi> 6 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 7 * All rights reserved 8 * 9 * As far as I am concerned, the code I have written for this software 10 * can be used freely for any purpose. Any derived versions of this 11 * software must be clearly marked as such, and if the derived work is 12 * incompatible with the protocol description in the RFC file, it must be 13 * called by a name other than "ssh" or "Secure Shell". 14 */ 15 16 /* Cipher used for encrypting authentication files. */ 17 #define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES 18 19 /* Default port number. */ 20 #define SSH_DEFAULT_PORT 22 21 22 /* 23 * Maximum number of certificate files that can be specified 24 * in configuration files or on the command line. 25 */ 26 #define SSH_MAX_CERTIFICATE_FILES 100 27 28 /* 29 * Maximum number of RSA authentication identity files that can be specified 30 * in configuration files or on the command line. 31 */ 32 #define SSH_MAX_IDENTITY_FILES 100 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 only 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 * Environment variable to control whether or not askpass is used. 73 */ 74 #define SSH_ASKPASS_REQUIRE_ENV "SSH_ASKPASS_REQUIRE" 75 76 /* 77 * Force host key length and server key length to differ by at least this 78 * many bits. This is to make double encryption with rsaref work. 79 */ 80 #define SSH_KEY_BITS_RESERVED 128 81 82 /* 83 * Length of the session key in bytes. (Specified as 256 bits in the 84 * protocol.) 85 */ 86 #define SSH_SESSION_KEY_LENGTH 32 87 88 /* Used to identify ``EscapeChar none'' */ 89 #define SSH_ESCAPECHAR_NONE -2 90 91 /* Name of Kerberos service for SSH to use. */ 92 #define KRB4_SERVICE_NAME "rcmd" 93 94 /* 95 * unprivileged user when UsePrivilegeSeparation=yes; 96 * sshd will change its privileges to this user and its 97 * primary group. 98 */ 99 #define SSH_PRIVSEP_USER "sshd" 100 101 /* Listen backlog for sshd, ssh-agent and forwarding sockets */ 102 #define SSH_LISTEN_BACKLOG 128 103 104 /* Limits for banner exchange */ 105 #define SSH_MAX_BANNER_LEN 8192 106 #define SSH_MAX_PRE_BANNER_LINES 1024 107