ssh.h

   1 /* $OpenBSD: ssh.h,v 1.79 2010/06/25 07:14:46 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 RSA authentication identity files that can be specified
  23  * in configuration files or on the command line.
  24  */
  25 #define SSH_MAX_IDENTITY_FILES          100
  26
  27 /*
  28  * Maximum length of lines in authorized_keys file.
  29  * Current value permits 16kbit RSA and RSA1 keys and 8kbit DSA keys, with
  30  * some room for options and comments.
  31  */
  32 #define SSH_MAX_PUBKEY_BYTES            8192
  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 both SSH1 and 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  * Force host key length and server key length to differ by at least this
  73  * many bits.  This is to make double encryption with rsaref work.
  74  */
  75 #define SSH_KEY_BITS_RESERVED           128
  76
  77 /*
  78  * Length of the session key in bytes.  (Specified as 256 bits in the
  79  * protocol.)
  80  */
  81 #define SSH_SESSION_KEY_LENGTH          32
  82
  83 /* Used to identify ``EscapeChar none'' */
  84 #define SSH_ESCAPECHAR_NONE             -2
  85
  86 /*
  87  * unprivileged user when UsePrivilegeSeparation=yes;
  88  * sshd will change its privileges to this user and its
  89  * primary group.
  90  */
  91 #ifndef SSH_PRIVSEP_USER
  92 #define SSH_PRIVSEP_USER                "sshd"
  93 #endif
  94
  95 /* Minimum modulus size (n) for RSA keys. */
  96 #define SSH_RSA_MINIMUM_MODULUS_SIZE    768
  97
  98 /* Listen backlog for sshd, ssh-agent and forwarding sockets */
  99 #define SSH_LISTEN_BACKLOG              128