1 /* $OpenBSD: ssh.h,v 1.83 2015/12/11 03:19:09 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 * Maximum length of lines in authorized_keys file. 35 * Current value permits 16kbit RSA and RSA1 keys and 8kbit DSA keys, with 36 * some room for options and comments. 37 */ 38 #define SSH_MAX_PUBKEY_BYTES 16384 39 40 /* 41 * Major protocol version. Different version indicates major incompatibility 42 * that prevents communication. 43 * 44 * Minor protocol version. Different version indicates minor incompatibility 45 * that does not prevent interoperation. 46 */ 47 #define PROTOCOL_MAJOR_1 1 48 #define PROTOCOL_MINOR_1 5 49 50 /* We support both SSH1 and SSH2 */ 51 #define PROTOCOL_MAJOR_2 2 52 #define PROTOCOL_MINOR_2 0 53 54 /* 55 * Name for the service. The port named by this service overrides the 56 * default port if present. 57 */ 58 #define SSH_SERVICE_NAME "ssh" 59 60 /* 61 * Name of the environment variable containing the process ID of the 62 * authentication agent. 63 */ 64 #define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID" 65 66 /* 67 * Name of the environment variable containing the pathname of the 68 * authentication socket. 69 */ 70 #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK" 71 72 /* 73 * Environment variable for overwriting the default location of askpass 74 */ 75 #define SSH_ASKPASS_ENV "SSH_ASKPASS" 76 77 /* 78 * Force host key length and server key length to differ by at least this 79 * many bits. This is to make double encryption with rsaref work. 80 */ 81 #define SSH_KEY_BITS_RESERVED 128 82 83 /* 84 * Length of the session key in bytes. (Specified as 256 bits in the 85 * protocol.) 86 */ 87 #define SSH_SESSION_KEY_LENGTH 32 88 89 /* Used to identify ``EscapeChar none'' */ 90 #define SSH_ESCAPECHAR_NONE -2 91 92 /* 93 * unprivileged user when UsePrivilegeSeparation=yes; 94 * sshd will change its privileges to this user and its 95 * primary group. 96 */ 97 #ifndef SSH_PRIVSEP_USER 98 #define SSH_PRIVSEP_USER "sshd" 99 #endif 100 101 /* Minimum modulus size (n) for RSA keys. */ 102 #define SSH_RSA_MINIMUM_MODULUS_SIZE 768 103 104 /* Listen backlog for sshd, ssh-agent and forwarding sockets */ 105 #define SSH_LISTEN_BACKLOG 128 106