ssh.h

   1 /* $OpenBSD: ssh.h,v 1.78 2006/08/03 03:34:42 deraadt 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 /* Maximum number of TCP/IP ports forwarded per direction. */
  22 #define SSH_MAX_FORWARDS_PER_DIRECTION  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  * Maximum length of lines in authorized_keys file.
  32  * Current value permits 16kbit RSA and RSA1 keys and 8kbit DSA keys, with
  33  * some room for options and comments.
  34  */
  35 #define SSH_MAX_PUBKEY_BYTES            8192
  36
  37 /*
  38  * Major protocol version.  Different version indicates major incompatibility
  39  * that prevents communication.
  40  *
  41  * Minor protocol version.  Different version indicates minor incompatibility
  42  * that does not prevent interoperation.
  43  */
  44 #define PROTOCOL_MAJOR_1        1
  45 #define PROTOCOL_MINOR_1        5
  46
  47 /* We support both SSH1 and SSH2 */
  48 #define PROTOCOL_MAJOR_2        2
  49 #define PROTOCOL_MINOR_2        0
  50
  51 /*
  52  * Name for the service.  The port named by this service overrides the
  53  * default port if present.
  54  */
  55 #define SSH_SERVICE_NAME        "ssh"
  56
  57 /*
  58  * Name of the environment variable containing the process ID of the
  59  * authentication agent.
  60  */
  61 #define SSH_AGENTPID_ENV_NAME   "SSH_AGENT_PID"
  62
  63 /*
  64  * Name of the environment variable containing the pathname of the
  65  * authentication socket.
  66  */
  67 #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
  68
  69 /*
  70  * Environment variable for overwriting the default location of askpass
  71  */
  72 #define SSH_ASKPASS_ENV         "SSH_ASKPASS"
  73
  74 /*
  75  * Force host key length and server key length to differ by at least this
  76  * many bits.  This is to make double encryption with rsaref work.
  77  */
  78 #define SSH_KEY_BITS_RESERVED           128
  79
  80 /*
  81  * Length of the session key in bytes.  (Specified as 256 bits in the
  82  * protocol.)
  83  */
  84 #define SSH_SESSION_KEY_LENGTH          32
  85
  86 /* Used to identify ``EscapeChar none'' */
  87 #define SSH_ESCAPECHAR_NONE             -2
  88
  89 /*
  90  * unprivileged user when UsePrivilegeSeparation=yes;
  91  * sshd will change its privileges to this user and its
  92  * primary group.
  93  */
  94 #ifndef SSH_PRIVSEP_USER
  95 #define SSH_PRIVSEP_USER                "sshd"
  96 #endif
  97
  98 /* Minimum modulus size (n) for RSA keys. */
  99 #define SSH_RSA_MINIMUM_MODULUS_SIZE    768
 100
 101 /* Listen backlog for sshd, ssh-agent and forwarding sockets */
 102 #define SSH_LISTEN_BACKLOG              128