annotate options.h @ 246:f4cf0415fec1 contrib-blacklist

- blacklisting patch from Michael Deiters
author Matt Johnston <matt@ucc.asn.au>
date Tue, 06 Sep 2005 04:52:46 +0000
parents 9089929fb2b7
children c07de41b53d7
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1 /* Dropbear SSH
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2 * Copyright (c) 2002,2003 Matt Johnston
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3 * All rights reserved. See LICENSE for the license. */
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5 #ifndef _OPTIONS_H_
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6 #define _OPTIONS_H_
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7
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8 /******************************************************************
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9 * Define compile-time options below - the "#ifndef DROPBEAR_XXX .... #endif"
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10 * parts are to allow for commandline -DDROPBEAR_XXX options etc.
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11 ******************************************************************/
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13 #ifndef DROPBEAR_DEFPORT
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14 #define DROPBEAR_DEFPORT "22"
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15 #endif
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16
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17 /* Default hostkey paths - these can be specified on the command line */
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18 #ifndef DSS_PRIV_FILENAME
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19 #define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
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20 #endif
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21 #ifndef RSA_PRIV_FILENAME
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22 #define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
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23 #endif
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25 /* File to store blacklisted IPs */
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26 #define BLACKLISTFILE "/var/dropbear/blacklist"
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27
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28 /* Set NON_INETD_MODE if you require daemon functionality (ie Dropbear listens
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29 * on chosen ports and keeps accepting connections. This is the default.
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30 *
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31 * Set INETD_MODE if you want to be able to run Dropbear with inetd (or
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32 * similar), where it will use stdin/stdout for connections, and each process
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33 * lasts for a single connection. Dropbear should be invoked with the -i flag
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34 * for inetd, and can only accept IPv4 connections.
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35 *
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36 * Both of these flags can be defined at once, don't compile without at least
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37 * one of them. */
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38 #define NON_INETD_MODE
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39 #define INETD_MODE
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40
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41 /* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is
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42 * perhaps 20% slower for pubkey operations (it is probably worth experimenting
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43 * if you want to use this) */
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44 /*#define NO_FAST_EXPTMOD*/
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46 /* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save
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47 several kB in binary size, however will make the symmetrical ciphers (AES, DES
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48 etc) slower (perhaps by 50%). Recommended for most small systems. */
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49 #define DROPBEAR_SMALL_CODE
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50
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51 /* Enable X11 Forwarding - server only */
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52 #define ENABLE_X11FWD
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54 /* Enable TCP Fowarding */
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55 /* 'Local' is "-L" style (client listening port forwarded via server)
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56 * 'Remote' is "-R" style (server listening port forwarded via client) */
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57
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58 #define ENABLE_CLI_LOCALTCPFWD
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59 #define ENABLE_CLI_REMOTETCPFWD
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60
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61 #define ENABLE_SVR_LOCALTCPFWD
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62 #define ENABLE_SVR_REMOTETCPFWD
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64 /* Enable Authentication Agent Forwarding - server only for now */
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65 #define ENABLE_AGENTFWD
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66
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67 /* Encryption - at least one required.
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68 * RFC Draft requires 3DES, and recommends Blowfish, AES128 & Twofish128 */
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69 #define DROPBEAR_AES128_CBC
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70 #define DROPBEAR_BLOWFISH_CBC
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71 #define DROPBEAR_TWOFISH128_CBC
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72 #define DROPBEAR_3DES_CBC
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74 /* Integrity - at least one required.
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75 * RFC Draft requires sha1-hmac, and recommends md5-hmac.
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76 *
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77 * Note: there's no point disabling sha1 to save space, since it's used in the
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78 * for the random number generator and public-key cryptography anyway.
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79 * Disabling it here will just stop it from being used as the integrity portion
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80 * of the ssh protocol.
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81 *
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82 * These are also used for key fingerprints in logs (when pubkey auth is used),
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83 * MD5 fingerprints are printed if available, however SHA1 fingerprints will be
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84 * generated otherwise. This isn't exactly optimal, although SHA1 fingerprints
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85 * are not too hard to create from pubkeys if required. */
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86 #define DROPBEAR_SHA1_HMAC
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87 #define DROPBEAR_MD5_HMAC
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88
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89 /* Hostkey/public key algorithms - at least one required, these are used
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90 * for hostkey as well as for verifying signatures with pubkey auth.
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91 * Removing either of these won't save very much space.
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92 * SSH2 RFC Draft requires dss, recommends rsa */
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93 #define DROPBEAR_RSA
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94 #define DROPBEAR_DSS
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96 /* RSA can be vulnerable to timing attacks which use the time required for
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97 * signing to guess the private key. Blinding avoids this attack, though makes
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98 * signing operations slightly slower. */
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99 #define RSA_BLINDING
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100
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101 /* Define DSS_PROTOK to use PuTTY's method of generating the value k for dss,
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102 * rather than just from the random byte source. Undefining this will save you
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103 * ~4k in binary size with static uclibc, but your DSS hostkey could be exposed
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104 * if the random number source isn't good. In general this isn't required */
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105 /* #define DSS_PROTOK */
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106
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107 /* Whether to do reverse DNS lookups. */
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108 #define DO_HOST_LOOKUP
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110 /* Whether to print the message of the day (MOTD). This doesn't add much code
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111 * size */
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112 #define DO_MOTD
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114 /* The MOTD file path */
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115 #ifndef MOTD_FILENAME
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116 #define MOTD_FILENAME "/etc/motd"
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117 #endif
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119 /* Authentication Types - at least one required.
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120 RFC Draft requires pubkey auth, and recommends password */
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122 /* Note: PAM auth is quite simple, and only works for PAM modules which just do
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123 * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
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124 * It's useful for systems like OS X where standard password crypts don't work,
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125 * but there's an interface via a PAM module - don't bother using it otherwise.
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126 * You can't enable both PASSWORD and PAM. */
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127
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128 //#define ENABLE_SVR_PASSWORD_AUTH
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129 #define ENABLE_SVR_PAM_AUTH
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130 #define ENABLE_SVR_PUBKEY_AUTH
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131
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132 #define ENABLE_CLI_PASSWORD_AUTH
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133 #define ENABLE_CLI_PUBKEY_AUTH
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134
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135 /* Define this (as well as ENABLE_CLI_PASSWORD_AUTH) to allow the use of
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136 * a helper program for the ssh client. The helper program should be
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137 * specified in the SSH_ASKPASS environment variable, and dbclient
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138 * should be run with DISPLAY set and no tty. The program should
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139 * return the password on standard output */
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140 /*#define ENABLE_CLI_ASKPASS_HELPER*/
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142 /* Random device to use - define either DROPBEAR_RANDOM_DEV or
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143 * DROPBEAR_PRNGD_SOCKET.
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144 * DROPBEAR_RANDOM_DEV is recommended on hosts with a good /dev/(u)random,
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145 * otherwise use run prngd (or egd if you want), specifying the socket.
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146 * The device will be queried for a few dozen bytes of seed a couple of times
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147 * per session (or more for very long-lived sessions). */
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148
149
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149 /* If you are lacking entropy on the system then using /dev/urandom
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150 * will prevent Dropbear from blocking on the device. This could
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151 * however significantly reduce the security of your ssh connections
176
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152 * if the PRNG state becomes guessable - make sure you know what you are
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153 * doing if you change this. */
149
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154 #define DROPBEAR_RANDOM_DEV "/dev/random"
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155
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156 /* prngd must be manually set up to produce output */
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157 /*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/
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158
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159 /* Specify the number of clients we will allow to be connected but
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160 * not yet authenticated. After this limit, connections are rejected */
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161 #ifndef MAX_UNAUTH_CLIENTS
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162 #define MAX_UNAUTH_CLIENTS 30
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163 #endif
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164
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165 /* Maximum number of failed authentication tries (server option) */
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166 #ifndef MAX_AUTH_TRIES
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167 #define MAX_AUTH_TRIES 2
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168 #endif
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169
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170 /* The file to store the daemon's process ID, for shutdown scripts etc */
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171 #ifndef DROPBEAR_PIDFILE
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172 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
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173 #endif
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174
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175 /* The command to invoke for xauth when using X11 forwarding.
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176 * "-q" for quiet */
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177 #ifndef XAUTH_COMMAND
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178 #define XAUTH_COMMAND "/usr/X11R6/bin/xauth -q"
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179 #endif
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180
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181 /* if you want to enable running an sftp server (such as the one included with
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182 * OpenSSH), set the path below. If the path isn't defined, sftp will not
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183 * be enabled */
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184 #ifndef SFTPSERVER_PATH
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185 #define SFTPSERVER_PATH "/usr/libexec/sftp-server"
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186 #endif
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187
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188 /* This is used by the scp binary when used as a client binary. If you're
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189 * not using the Dropbear client, you'll need to change it */
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190 #define _PATH_SSH_PROGRAM "/usr/bin/dbclient"
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191
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192 /* Multi-purpose binary configuration has now moved. Look at the top
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193 * of the Makefile for instructions, or INSTALL */
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194
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195 /*******************************************************************
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196 * You shouldn't edit below here unless you know you need to.
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197 *******************************************************************/
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198
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199 #ifndef DROPBEAR_VERSION
220
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200 #define DROPBEAR_VERSION "0.46"
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201 #endif
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202
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203 #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
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204 #define PROGNAME "dropbear"
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205
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206 /* Spec recommends after one hour or 1 gigabyte of data. One hour
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207 * is a bit too verbose, so we try 8 hours */
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208 #ifndef KEX_REKEY_TIMEOUT
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209 #define KEX_REKEY_TIMEOUT (3600 * 8)
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210 #endif
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211 #ifndef KEX_REKEY_DATA
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212 #define KEX_REKEY_DATA (1<<30) /* 2^30 == 1GB, this value must be < INT_MAX */
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213 #endif
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214 /* Close connections to clients which haven't authorised after AUTH_TIMEOUT */
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215 #ifndef AUTH_TIMEOUT
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216 #define AUTH_TIMEOUT 300 /* we choose 5 minutes */
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217 #endif
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218
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219 /* Minimum key sizes for DSS and RSA */
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220 #ifndef MIN_DSS_KEYLEN
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221 #define MIN_DSS_KEYLEN 512
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222 #endif
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223 #ifndef MIN_RSA_KEYLEN
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224 #define MIN_RSA_KEYLEN 512
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225 #endif
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226
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227 #define MAX_BANNER_SIZE 2000 /* this is 25*80 chars, any more is foolish */
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228 #define MAX_BANNER_LINES 20 /* How many lines the client will display */
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229
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230 /* the number of NAME=VALUE pairs to malloc for environ, if we don't have
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231 * the clearenv() function */
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232 #define ENV_SIZE 100
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233
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234 #define MAX_CMD_LEN 1024 /* max length of a command */
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235 #define MAX_TERM_LEN 200 /* max length of TERM name */
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236
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237 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
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238 #define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
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239
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240 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
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241 ipv4 and ipv6 don't count twice */
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242
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243 #define _PATH_TTY "/dev/tty"
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244
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245 /* Timeouts in seconds */
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246 #define SELECT_TIMEOUT 20
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247
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248 /* success/failure defines */
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249 #define DROPBEAR_SUCCESS 0
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250 #define DROPBEAR_FAILURE -1
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251
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252 /* various algorithm identifiers */
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253 #define DROPBEAR_KEX_DH_GROUP1 0
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254
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255 #define DROPBEAR_SIGNKEY_ANY 0
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256 #define DROPBEAR_SIGNKEY_RSA 1
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257 #define DROPBEAR_SIGNKEY_DSS 2
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258 #define DROPBEAR_SIGNKEY_NONE 3
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259
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260 #define DROPBEAR_COMP_NONE 0
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261 #define DROPBEAR_COMP_ZLIB 1
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262
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263 /* Required for pubkey auth */
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264 #if defined(ENABLE_SVR_PUBKEY_AUTH) || defined(DROPBEAR_CLIENT)
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265 #define DROPBEAR_SIGNKEY_VERIFY
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266 #endif
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267
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268 /* SHA1 is 20 bytes == 160 bits */
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269 #define SHA1_HASH_SIZE 20
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270 /* SHA512 is 64 bytes == 512 bits */
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271 #define SHA512_HASH_SIZE 64
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272 /* MD5 is 16 bytes = 128 bits */
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273 #define MD5_HASH_SIZE 16
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274
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275 /* largest of MD5 and SHA1 */
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276 #define MAX_MAC_LEN SHA1_HASH_SIZE
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277
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278
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279 #define MAX_KEY_LEN 24 /* 3DES requires a 24 byte key */
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280 #define MAX_IV_LEN 20 /* must be same as max blocksize,
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281 and >= SHA1_HASH_SIZE */
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282 #define MAX_MAC_KEY 20
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283
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284 #define MAX_NAME_LEN 64 /* maximum length of a protocol name, isn't
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285 explicitly specified for all protocols (just
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286 for algos) but seems valid */
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287
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288 #define MAX_PROPOSED_ALGO 20
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289
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290 /* size/count limits */
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291 #define MAX_LISTEN_ADDR 10
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292
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293 #define MAX_PACKET_LEN 35000
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294 #define MIN_PACKET_LEN 16
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295 #define MAX_PAYLOAD_LEN 32768
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296
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297 #define MAX_TRANS_PAYLOAD_LEN 32768
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298 #define MAX_TRANS_PACKET_LEN (MAX_TRANS_PAYLOAD_LEN+50)
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299
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300 #define MAX_TRANS_WINDOW 500000000 /* 500MB is sufficient, stopping overflow */
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301 #define MAX_TRANS_WIN_INCR 500000000 /* overflow prevention */
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302
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303 #define MAX_STRING_LEN 1400 /* ~= MAX_PROPOSED_ALGO * MAX_NAME_LEN, also
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304 is the max length for a password etc */
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305
47
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306 /* For a 4096 bit DSS key, empirically determined to be 1590 bytes */
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307 #define MAX_PUBKEY_SIZE 1600
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308 /* For a 4096 bit DSS key, empirically determined to be 1590 bytes */
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309 #define MAX_PRIVKEY_SIZE 1600
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310
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311 #define DROPBEAR_MAX_SOCKS 2 /* IPv4, IPv6 are all we'll get for now. Revisit
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312 in a few years time.... */
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313
173
257f09a63dab * add SSH_ASKPASS support (based on patch from Paul Whittaker
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314 #define DROPBEAR_MAX_CLI_PASS 1024
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315
4
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316 #ifndef ENABLE_X11FWD
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317 #define DISABLE_X11FWD
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318 #endif
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319
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320 #ifndef ENABLE_AGENTFWD
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321 #define DISABLE_AGENTFWD
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322 #endif
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323
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324 #if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD)
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325 #define ENABLE_CLI_ANYTCPFWD
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326 #endif
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327
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328 #if defined(ENABLE_CLI_LOCALTCPFWD) || defined(ENABLE_SVR_REMOTETCPFWD)
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329 #define DROPBEAR_TCP_ACCEPT
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330 #endif
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331
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332 #if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD) || \
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333 defined(ENABLE_SVR_REMOTETCPFWD) || defined(ENABLE_SVR_LOCALTCPFWD) || \
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334 defined(ENABLE_AGENTFWD) || defined(ENABLE_X11FWD)
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335 #define USING_LISTENERS
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336 #endif
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337
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338 #if defined(DROPBEAR_CLIENT) || defined(ENABLE_SVR_PUBKEY_AUTH)
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339 #define DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */
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340 #endif
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341
119
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342 #if defined(ENABLE_SVR_PASSWORD_AUTH) && defined(ENABLE_SVR_PAM_AUTH)
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343 #error "You can't turn on PASSWORD and PAM auth both at once. Fix it in options.h"
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344 #endif
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345
149
ed9ca2a9705c Cleaned up the random code, use /dev/random by default,
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346 #if defined(DROPBEAR_RANDOM_DEV) && defined(DROPBEAR_PRNGD_SOCKET)
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347 #error "You can't turn on DROPBEAR_PRNGD_SOCKET and DROPBEAR_RANDOM_DEV at once"
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348 #endif
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349
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350 #if !defined(DROPBEAR_RANDOM_DEV) && !defined(DROPBEAR_PRNGD_SOCKET)
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351 #error "You must choose one of DROPBEAR_PRNGD_SOCKET or DROPBEAR_RANDOM_DEV in options.h"
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352 #endif
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353
4
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354 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
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355 * code, if we're just compiling as client or server */
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356 #if defined(DROPBEAR_SERVER) && defined(DROPBEAR_CLIENT)
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357
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358 #define IS_DROPBEAR_SERVER (ses.isserver == 1)
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359 #define IS_DROPBEAR_CLIENT (ses.isserver == 0)
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360
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361 #elif defined(DROPBEAR_SERVER)
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362
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363 #define IS_DROPBEAR_SERVER 1
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364 #define IS_DROPBEAR_CLIENT 0
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365
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366 #elif defined(DROPBEAR_CLIENT)
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367
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368 #define IS_DROPBEAR_SERVER 0
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369 #define IS_DROPBEAR_CLIENT 1
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370
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371 #else
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372 #error You must compiled with either DROPBEAR_CLIENT or DROPBEAR_SERVER selected
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373 #endif
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374
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375 #endif /* _OPTIONS_H_ */