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 92