ssh.h

   1 /* $OpenBSD: ssh.h,v 1.91 2024/09/25 23:01:39 jsg 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 /* Default port number. */
  16 #define SSH_DEFAULT_PORT        22
  17
  18 /*
  19  * Maximum number of certificate files that can be specified
  20  * in configuration files or on the command line.
  21  */
  22 #define SSH_MAX_CERTIFICATE_FILES       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  * Major protocol version.  Different version indicates major incompatibility
  32  * that prevents communication.
  33  *
  34  * Minor protocol version.  Different version indicates minor incompatibility
  35  * that does not prevent interoperation.
  36  *
  37  * We support only SSH2
  38  */
  39 #define PROTOCOL_MAJOR_2        2
  40 #define PROTOCOL_MINOR_2        0
  41
  42 /*
  43  * Name for the service.  The port named by this service overrides the
  44  * default port if present.
  45  */
  46 #define SSH_SERVICE_NAME        "ssh"
  47
  48 /*
  49  * Name of the environment variable containing the process ID of the
  50  * authentication agent.
  51  */
  52 #define SSH_AGENTPID_ENV_NAME   "SSH_AGENT_PID"
  53
  54 /*
  55  * Name of the environment variable containing the pathname of the
  56  * authentication socket.
  57  */
  58 #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
  59
  60 /*
  61  * Environment variable for overwriting the default location of askpass
  62  */
  63 #define SSH_ASKPASS_ENV         "SSH_ASKPASS"
  64
  65 /*
  66  * Environment variable to control whether or not askpass is used.
  67  */
  68 #define SSH_ASKPASS_REQUIRE_ENV         "SSH_ASKPASS_REQUIRE"
  69
  70 /*
  71  * Length of the session key in bytes.  (Specified as 256 bits in the
  72  * protocol.)
  73  */
  74 #define SSH_SESSION_KEY_LENGTH          32
  75
  76 /* Used to identify ``EscapeChar none'' */
  77 #define SSH_ESCAPECHAR_NONE             -2
  78
  79 /*
  80  * unprivileged user when UsePrivilegeSeparation=yes;
  81  * sshd will change its privileges to this user and its
  82  * primary group.
  83  */
  84 #ifndef SSH_PRIVSEP_USER
  85 #define SSH_PRIVSEP_USER                "sshd"
  86 #endif
  87
  88 /* Listen backlog for sshd, ssh-agent and forwarding sockets */
  89 #define SSH_LISTEN_BACKLOG              128
  90
  91 /* Limits for banner exchange */
  92 #define SSH_MAX_BANNER_LEN              8192
  93 #define SSH_MAX_PRE_BANNER_LINES        1024