crypto/openssh/ssh.h

   1 /* $OpenBSD: ssh.h,v 1.90 2020/07/14 23:57:01 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  * Major protocol version.  Different version indicates major incompatibility
  35  * that prevents communication.
  36  *
  37  * Minor protocol version.  Different version indicates minor incompatibility
  38  * that does not prevent interoperation.
  39  */
  40 #define PROTOCOL_MAJOR_1        1
  41 #define PROTOCOL_MINOR_1        5
  42
  43 /* We support only SSH2 */
  44 #define PROTOCOL_MAJOR_2        2
  45 #define PROTOCOL_MINOR_2        0
  46
  47 /*
  48  * Name for the service.  The port named by this service overrides the
  49  * default port if present.
  50  */
  51 #define SSH_SERVICE_NAME        "ssh"
  52
  53 /*
  54  * Name of the environment variable containing the process ID of the
  55  * authentication agent.
  56  */
  57 #define SSH_AGENTPID_ENV_NAME   "SSH_AGENT_PID"
  58
  59 /*
  60  * Name of the environment variable containing the pathname of the
  61  * authentication socket.
  62  */
  63 #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
  64
  65 /*
  66  * Environment variable for overwriting the default location of askpass
  67  */
  68 #define SSH_ASKPASS_ENV         "SSH_ASKPASS"
  69
  70 /*
  71  * Environment variable to control whether or not askpass is used.
  72  */
  73 #define SSH_ASKPASS_REQUIRE_ENV         "SSH_ASKPASS_REQUIRE"
  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 /*
  91  * unprivileged user when UsePrivilegeSeparation=yes;
  92  * sshd will change its privileges to this user and its
  93  * primary group.
  94  */
  95 #ifndef SSH_PRIVSEP_USER
  96 #define SSH_PRIVSEP_USER                "sshd"
  97 #endif
  98
  99 /* Listen backlog for sshd, ssh-agent and forwarding sockets */
 100 #define SSH_LISTEN_BACKLOG              128
 101
 102 /* Limits for banner exchange */
 103 #define SSH_MAX_BANNER_LEN              8192
 104 #define SSH_MAX_PRE_BANNER_LINES        1024