Mercurial > dropbear

annotate options.h @ 565:1929bbe3fa84

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merge of '0d7a9127af37d6e74efc5ec031a7001ce63d334d' and 'e35cd321b6d4fab6ad854827249f610da3bb6878'
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Aug 2009 11:11:35 +0000
parents 541ebf5bf0f6
children b321aeb57c64
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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 #ifndef DROPBEAR_DEFADDRESS
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18 /* Listen on all interfaces */
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19 #define DROPBEAR_DEFADDRESS ""
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20 #endif
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21
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22 /* Default hostkey paths - these can be specified on the command line */
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23 #ifndef DSS_PRIV_FILENAME
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24 #define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
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25 #endif
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26 #ifndef RSA_PRIV_FILENAME
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27 #define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
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28 #endif
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29
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30 /* Set NON_INETD_MODE if you require daemon functionality (ie Dropbear listens
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31 * on chosen ports and keeps accepting connections. This is the default.
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32 *
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33 * Set INETD_MODE if you want to be able to run Dropbear with inetd (or
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34 * similar), where it will use stdin/stdout for connections, and each process
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35 * lasts for a single connection. Dropbear should be invoked with the -i flag
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36 * for inetd, and can only accept IPv4 connections.
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37 *
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38 * Both of these flags can be defined at once, don't compile without at least
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39 * one of them. */
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40 #define NON_INETD_MODE
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41 #define INETD_MODE
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42
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43 /* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is
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44 * perhaps 20% slower for pubkey operations (it is probably worth experimenting
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45 * if you want to use this) */
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46 /*#define NO_FAST_EXPTMOD*/
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47
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48 /* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save
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49 several kB in binary size however will make the symmetrical ciphers and hashes
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50 slower, perhaps by 50%. Recommended for small systems that aren't doing
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51 much traffic. */
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52 /*#define DROPBEAR_SMALL_CODE*/
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54 /* Enable X11 Forwarding - server only */
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55 #define ENABLE_X11FWD
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57 /* Enable TCP Fowarding */
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58 /* 'Local' is "-L" style (client listening port forwarded via server)
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59 * 'Remote' is "-R" style (server listening port forwarded via client) */
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60
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61 #define ENABLE_CLI_LOCALTCPFWD
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62 #define ENABLE_CLI_REMOTETCPFWD
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63
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64 #define ENABLE_SVR_LOCALTCPFWD
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65 #define ENABLE_SVR_REMOTETCPFWD
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67 /* Enable Authentication Agent Forwarding - server only for now */
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68 #define ENABLE_SVR_AGENTFWD
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69 #define ENABLE_CLI_AGENTFWD
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72 /* Note: Both ENABLE_CLI_PROXYCMD and ENABLE_CLI_NETCAT must be set to
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73 * allow multihop dbclient connections */
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74
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75 /* Allow using -J <proxycommand> to run the connection through a
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76 pipe to a program, rather the normal TCP connection */
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77 #define ENABLE_CLI_PROXYCMD
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78
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79 /* Enable "Netcat mode" option. This will forward standard input/output
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80 * to a remote TCP-forwarded connection */
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81 #define ENABLE_CLI_NETCAT
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82
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83 /* Encryption - at least one required.
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84 * Protocol RFC requires 3DES and recommends AES128 for interoperability.
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85 * Including multiple keysize variants the same cipher
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86 * (eg AES256 as well as AES128) will result in a minimal size increase.*/
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87 #define DROPBEAR_AES128
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88 #define DROPBEAR_3DES
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89 #define DROPBEAR_AES256
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90 /* Compiling in Blowfish will add ~6kB to runtime heap memory usage */
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91 /*#define DROPBEAR_BLOWFISH*/
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92 #define DROPBEAR_TWOFISH256
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93 #define DROPBEAR_TWOFISH128
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94
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95 /* Enable "Counter Mode" for ciphers. This is more secure than normal
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96 * CBC mode against certain attacks. This adds around 1kB to binary
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97 * size and is recommended for most cases */
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98 #define DROPBEAR_ENABLE_CTR_MODE
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99
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100 /* Message Integrity - at least one required.
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101 * Protocol RFC requires sha1 and recommends sha1-96.
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102 * sha1-96 may be of use for slow links, as it has a smaller overhead.
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103 *
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104 * Note: there's no point disabling sha1 to save space, since it's used
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105 * for the random number generator and public-key cryptography anyway.
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106 * Disabling it here will just stop it from being used as the integrity portion
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107 * of the ssh protocol.
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108 *
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109 * These hashes are also used for public key fingerprints in logs.
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110 * If you disable MD5, Dropbear will fall back to SHA1 fingerprints,
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111 * which are not the standard form. */
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112 #define DROPBEAR_SHA1_HMAC
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113 #define DROPBEAR_SHA1_96_HMAC
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114 #define DROPBEAR_MD5_HMAC
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115
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116 /* Hostkey/public key algorithms - at least one required, these are used
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117 * for hostkey as well as for verifying signatures with pubkey auth.
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118 * Removing either of these won't save very much space.
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119 * SSH2 RFC Draft requires dss, recommends rsa */
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120 #define DROPBEAR_RSA
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121 #define DROPBEAR_DSS
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122
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123 /* RSA can be vulnerable to timing attacks which use the time required for
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124 * signing to guess the private key. Blinding avoids this attack, though makes
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125 * signing operations slightly slower. */
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126 #define RSA_BLINDING
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127
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128 /* Define DSS_PROTOK to use PuTTY's method of generating the value k for dss,
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129 * rather than just from the random byte source. Undefining this will save you
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130 * ~4k in binary size with static uclibc, but your DSS hostkey could be exposed
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131 * if the random number source isn't good. In general this isn't required */
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132 /* #define DSS_PROTOK */
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133
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134 /* Control the memory/performance/compression tradeoff for zlib.
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135 * Set windowBits=8, memLevel=1 for least memory usage, see your system's
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136 * zlib.h for full details.
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137 * Default settings (windowBits=15, memLevel=8) will use
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138 * 256kB for compression + 32kB for decompression.
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139 * windowBits=8, memLevel=1 will use 10kB compression + 32kB decompression.
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140 * Note that windowBits is only set for deflate() - inflate() always uses the
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141 * default of 15 so as to interoperate with other clients. */
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142 #ifndef DROPBEAR_ZLIB_WINDOW_BITS
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143 #define DROPBEAR_ZLIB_WINDOW_BITS 15
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144 #endif
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145 #ifndef DROPBEAR_ZLIB_MEM_LEVEL
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146 #define DROPBEAR_ZLIB_MEM_LEVEL 8
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147 #endif
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148
172
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149 /* Whether to do reverse DNS lookups. */
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150 #define DO_HOST_LOOKUP
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151
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152 /* Whether to print the message of the day (MOTD). This doesn't add much code
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153 * size */
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154 #define DO_MOTD
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155
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156 /* The MOTD file path */
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157 #ifndef MOTD_FILENAME
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158 #define MOTD_FILENAME "/etc/motd"
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159 #endif
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160
121
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161 /* Authentication Types - at least one required.
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162 RFC Draft requires pubkey auth, and recommends password */
121
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163
176
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164 /* Note: PAM auth is quite simple, and only works for PAM modules which just do
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165 * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
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166 * It's useful for systems like OS X where standard password crypts don't work,
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167 * but there's an interface via a PAM module - don't bother using it otherwise.
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168 * You can't enable both PASSWORD and PAM. */
121
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169
517
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170 #define ENABLE_SVR_PASSWORD_AUTH
499
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171 /* PAM requires ./configure --enable-pam */
517
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172 /*#define ENABLE_SVR_PAM_AUTH*/
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173 #define ENABLE_SVR_PUBKEY_AUTH
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174
475
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175 /* Wether to ake public key options in authorized_keys file into account */
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176 #ifdef ENABLE_SVR_PUBKEY_AUTH
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177 #define ENABLE_SVR_PUBKEY_OPTIONS
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178 #endif
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179
68
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180 #define ENABLE_CLI_PASSWORD_AUTH
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181 #define ENABLE_CLI_PUBKEY_AUTH
249
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182 #define ENABLE_CLI_INTERACT_AUTH
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183
441
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184 /* This variable can be used to set a password for client
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185 * authentication on the commandline. Beware of platforms
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186 * that don't protect environment variables of processes etc. Also
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187 * note that it will be provided for all "hidden" client-interactive
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188 * style prompts - if you want something more sophisticated, use
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189 * SSH_ASKPASS instead. Comment out this var to remove this functionality.*/
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190 #define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
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191
173
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192 /* Define this (as well as ENABLE_CLI_PASSWORD_AUTH) to allow the use of
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193 * a helper program for the ssh client. The helper program should be
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194 * specified in the SSH_ASKPASS environment variable, and dbclient
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195 * should be run with DISPLAY set and no tty. The program should
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196 * return the password on standard output */
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197 /*#define ENABLE_CLI_ASKPASS_HELPER*/
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198
149
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199 /* Random device to use - define either DROPBEAR_RANDOM_DEV or
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200 * DROPBEAR_PRNGD_SOCKET.
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201 * DROPBEAR_RANDOM_DEV is recommended on hosts with a good /dev/(u)random,
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202 * otherwise use run prngd (or egd if you want), specifying the socket.
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203 * The device will be queried for a few dozen bytes of seed a couple of times
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204 * per session (or more for very long-lived sessions). */
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205
446
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206 /* We'll use /dev/urandom by default, since /dev/random is too much hassle.
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207 * If system developers aren't keeping seeds between boots nor getting
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208 * any entropy from somewhere it's their own fault. */
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209 #define DROPBEAR_RANDOM_DEV "/dev/urandom"
442
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210
149
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211 /* prngd must be manually set up to produce output */
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212 /*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/
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213
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214 /* Specify the number of clients we will allow to be connected but
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215 * not yet authenticated. After this limit, connections are rejected */
277
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216 /* The first setting is per-IP, to avoid denial of service */
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217 #ifndef MAX_UNAUTH_PER_IP
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218 #define MAX_UNAUTH_PER_IP 5
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219 #endif
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220
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221 /* And then a global limit to avoid chewing memory if connections
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222 * come from many IPs */
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223 #ifndef MAX_UNAUTH_CLIENTS
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224 #define MAX_UNAUTH_CLIENTS 30
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225 #endif
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226
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227 /* Maximum number of failed authentication tries (server option) */
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228 #ifndef MAX_AUTH_TRIES
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229 #define MAX_AUTH_TRIES 10
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230 #endif
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231
437
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232 /* The default file to store the daemon's process ID, for shutdown
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233 scripts etc. This can be overridden with the -P flag */
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234 #ifndef DROPBEAR_PIDFILE
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235 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
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236 #endif
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237
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238 /* The command to invoke for xauth when using X11 forwarding.
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239 * "-q" for quiet */
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240 #ifndef XAUTH_COMMAND
558
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241 #define XAUTH_COMMAND "/usr/bin/X11/xauth -q"
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242 #endif
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243
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244 /* if you want to enable running an sftp server (such as the one included with
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245 * OpenSSH), set the path below. If the path isn't defined, sftp will not
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246 * be enabled */
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247 #ifndef SFTPSERVER_PATH
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248 #define SFTPSERVER_PATH "/usr/libexec/sftp-server"
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249 #endif
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250
66
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251 /* This is used by the scp binary when used as a client binary. If you're
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252 * not using the Dropbear client, you'll need to change it */
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253 #define _PATH_SSH_PROGRAM "/usr/bin/dbclient"
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254
349
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255 /* Whether to log commands executed by a client. This only logs the
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256 * (single) command sent to the server, not what a user did in a
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257 * shell/sftp session etc. */
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258 /* #define LOG_COMMANDS */
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259
448
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260 /* Window size limits. These tend to be a trade-off between memory
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261 usage and network performance: */
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262 /* Size of the network receive window. This amount of memory is allocated
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263 as a per-channel receive buffer. Increasing this value can make a
449
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264 significant difference to network performance. 24kB was empirically
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265 chosen for a 100mbit ethernet network. The value can be altered at
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266 runtime with the -W argument. */
555
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267 #ifndef DEFAULT_RECV_WINDOW
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268 #define DEFAULT_RECV_WINDOW 24576
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269 #endif
448
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270 /* Maximum size of a received SSH data packet - this _MUST_ be >= 32768
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271 in order to interoperate with other implementations */
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272 #ifndef RECV_MAX_PAYLOAD_LEN
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273 #define RECV_MAX_PAYLOAD_LEN 32768
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274 #endif
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275 /* Maximum size of a transmitted data packet - this can be any value,
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276 though increasing it may not make a significant difference. */
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277 #ifndef TRANS_MAX_PAYLOAD_LEN
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278 #define TRANS_MAX_PAYLOAD_LEN 16384
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279 #endif
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280
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281 /* Ensure that data is transmitted every KEEPALIVE seconds. This can
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282 be overridden at runtime with -K. 0 disables keepalives */
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283 #define DEFAULT_KEEPALIVE 0
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284
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285 /* Ensure that data is received within IDLE_TIMEOUT seconds. This can
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286 be overridden at runtime with -I. 0 disables idle timeouts */
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287 #define DEFAULT_IDLE_TIMEOUT 0
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288
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289 /* The default path. This will often get replaced by the shell */
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290 #define DEFAULT_PATH "/usr/bin:/bin"
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291
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292 /* Some other defines (that mostly should be left alone) are defined
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293 * in sysoptions.h */
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294 #include "sysoptions.h"
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295
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296 #endif /* _OPTIONS_H_ */