1 /* $NetBSD: ssh.h,v 1.2 2009/06/07 22:38:47 christos Exp $ */ 2 /* $OpenBSD: ssh.h,v 1.78 2006/08/03 03:34:42 deraadt 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 /* Maximum number of TCP/IP ports forwarded per direction. */ 23 #define SSH_MAX_FORWARDS_PER_DIRECTION 100 24 25 /* 26 * Maximum number of RSA authentication identity files that can be specified 27 * in configuration files or on the command line. 28 */ 29 #define SSH_MAX_IDENTITY_FILES 100 30 31 /* 32 * Maximum length of lines in authorized_keys file. 33 * Current value permits 16kbit RSA and RSA1 keys and 8kbit DSA keys, with 34 * some room for options and comments. 35 */ 36 #define SSH_MAX_PUBKEY_BYTES 8192 37 38 /* 39 * Major protocol version. Different version indicates major incompatibility 40 * that prevents communication. 41 * 42 * Minor protocol version. Different version indicates minor incompatibility 43 * that does not prevent interoperation. 44 */ 45 #define PROTOCOL_MAJOR_1 1 46 #define PROTOCOL_MINOR_1 5 47 48 /* We support both SSH1 and SSH2 */ 49 #define PROTOCOL_MAJOR_2 2 50 #define PROTOCOL_MINOR_2 0 51 52 /* 53 * Name for the service. The port named by this service overrides the 54 * default port if present. 55 */ 56 #define SSH_SERVICE_NAME "ssh" 57 58 /* 59 * Name of the environment variable containing the process ID of the 60 * authentication agent. 61 */ 62 #define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID" 63 64 /* 65 * Name of the environment variable containing the pathname of the 66 * authentication socket. 67 */ 68 #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK" 69 70 /* 71 * Environment variable for overwriting the default location of askpass 72 */ 73 #define SSH_ASKPASS_ENV "SSH_ASKPASS" 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 /* Name of Kerberos service for SSH to use. */ 91 #define KRB4_SERVICE_NAME "rcmd" 92 93 /* 94 * unprivileged user when UsePrivilegeSeparation=yes; 95 * sshd will change its privileges to this user and its 96 * primary group. 97 */ 98 #define SSH_PRIVSEP_USER "sshd" 99 100 /* Minimum modulus size (n) for RSA keys. */ 101 #define SSH_RSA_MINIMUM_MODULUS_SIZE 768 102 103 /* Listen backlog for sshd, ssh-agent and forwarding sockets */ 104 #define SSH_LISTEN_BACKLOG 128 105