annotate options.h @ 511:582cb38e4eb5 insecure-nocrypto

propagate from branch 'au.asn.ucc.matt.dropbear' (head cdcc3c729e29544e8b98a408e2dc60e4483dfd2a) to branch 'au.asn.ucc.matt.dropbear.insecure-nocrypto' (head 0ca38a1cf349f7426ac9de34ebe4c3e3735effab)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 06 Nov 2008 13:16:55 +0000
parents 461c4b1fb35f b85507ade010
children 0129fd8ccc71
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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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12
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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 (AES, DES
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50 etc) slower (perhaps by 50%). Recommended for most small systems. */
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51 #define DROPBEAR_SMALL_CODE
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52
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53 /* Enable X11 Forwarding - server only */
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54 #define ENABLE_X11FWD
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56 /* Enable TCP Fowarding */
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57 /* 'Local' is "-L" style (client listening port forwarded via server)
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58 * 'Remote' is "-R" style (server listening port forwarded via client) */
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59
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60 #define ENABLE_CLI_LOCALTCPFWD
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61 #define ENABLE_CLI_REMOTETCPFWD
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62
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63 #define ENABLE_SVR_LOCALTCPFWD
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64 #define ENABLE_SVR_REMOTETCPFWD
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66 /* Enable Authentication Agent Forwarding - server only for now */
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67 #define ENABLE_AGENTFWD
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70 /* Note: Both ENABLE_CLI_PROXYCMD and ENABLE_CLI_NETCAT must be set to
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71 * allow multihop dbclient connections */
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72
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73 /* Allow using -J <proxycommand> to run the connection through a
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74 pipe to a program, rather the normal TCP connection */
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75 #define ENABLE_CLI_PROXYCMD
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76
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77 /* Enable "Netcat mode" option. This will forward standard input/output
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78 * to a remote TCP-forwarded connection */
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79 #define ENABLE_CLI_NETCAT
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80
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81 /* Encryption - at least one required.
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82 * Protocol RFC requires 3DES and recommends AES128 for interoperability.
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83 * Including multiple keysize variants the same cipher
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84 * (eg AES256 as well as AES128) will result in a minimal size increase.*/
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85 #define DROPBEAR_AES128
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86 #define DROPBEAR_3DES
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87 #define DROPBEAR_AES256
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88 #define DROPBEAR_BLOWFISH
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89 #define DROPBEAR_TWOFISH256
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90 #define DROPBEAR_TWOFISH128
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91
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92 /* Enable "Counter Mode" for ciphers. This is more secure than normal
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93 * CBC mode against certain attacks. This adds around 1kB to binary
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94 * size and is recommended for most cases */
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95 #define DROPBEAR_ENABLE_CTR_MODE
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96 /* You can compile with no encryption if you want. In some circumstances
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97 * this could be safe securitywise, though make sure you know what
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98 * you're doing. Anyone can see everything that goes over the wire, so
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99 * the only safe auth method is public key. You'll have to disable all other
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100 * ciphers above in the client if you want to use this, or implement cipher
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101 * prioritisation in cli-runopts.
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102 *
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103 * The best way to do things is probably make normal compile of dropbear with
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104 * all ciphers including "none" as the server, then recompile a special
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105 * "dbclient-insecure" client. */
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106 #define DROPBEAR_NONE_CIPHER
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107
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108 /* Message Integrity - at least one required.
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109 * Protocol RFC requires sha1 and recommends sha1-96.
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110 * sha1-96 may be of use for slow links, as it has a smaller overhead.
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111 *
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112 * Note: there's no point disabling sha1 to save space, since it's used
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113 * for the random number generator and public-key cryptography anyway.
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114 * Disabling it here will just stop it from being used as the integrity portion
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115 * of the ssh protocol.
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116 *
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117 * These hashes are also used for public key fingerprints in logs.
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118 * If you disable MD5, Dropbear will fall back to SHA1 fingerprints,
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119 * which are not the standard form. */
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120 #define DROPBEAR_SHA1_HMAC
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121 #define DROPBEAR_SHA1_96_HMAC
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122 #define DROPBEAR_MD5_HMAC
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123
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124 /* You can also disable integrity. Don't bother disabling this if you're
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125 * still using a cipher, it's relatively cheap. Don't disable this if you're
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126 * using 'none' cipher, since it's dead simple to run arbitrary commands
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127 * on the remote host. Beware. */
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128 /*#define DROPBEAR_NONE_INTEGRITY*/
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129
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130 /* Hostkey/public key algorithms - at least one required, these are used
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131 * for hostkey as well as for verifying signatures with pubkey auth.
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132 * Removing either of these won't save very much space.
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133 * SSH2 RFC Draft requires dss, recommends rsa */
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134 #define DROPBEAR_RSA
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135 #define DROPBEAR_DSS
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136
216
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137 /* RSA can be vulnerable to timing attacks which use the time required for
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138 * signing to guess the private key. Blinding avoids this attack, though makes
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139 * signing operations slightly slower. */
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140 #define RSA_BLINDING
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141
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142 /* Define DSS_PROTOK to use PuTTY's method of generating the value k for dss,
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143 * rather than just from the random byte source. Undefining this will save you
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144 * ~4k in binary size with static uclibc, but your DSS hostkey could be exposed
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145 * if the random number source isn't good. In general this isn't required */
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146 /* #define DSS_PROTOK */
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147
172
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148 /* Whether to do reverse DNS lookups. */
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149 #define DO_HOST_LOOKUP
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150
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151 /* Whether to print the message of the day (MOTD). This doesn't add much code
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152 * size */
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153 #define DO_MOTD
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154
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155 /* The MOTD file path */
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156 #ifndef MOTD_FILENAME
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157 #define MOTD_FILENAME "/etc/motd"
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158 #endif
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159
121
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160 /* Authentication Types - at least one required.
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161 RFC Draft requires pubkey auth, and recommends password */
121
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162
176
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163 /* Note: PAM auth is quite simple, and only works for PAM modules which just do
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164 * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
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165 * It's useful for systems like OS X where standard password crypts don't work,
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166 * but there's an interface via a PAM module - don't bother using it otherwise.
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167 * You can't enable both PASSWORD and PAM. */
121
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168
499
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169 #define ENABLE_SVR_PASSWORD_AUTH
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170 /* PAM requires ./configure --enable-pam */
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171 /*#define ENABLE_SVR_PAM_AUTH*/
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172 #define ENABLE_SVR_PUBKEY_AUTH
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173
475
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174 /* Wether to ake public key options in authorized_keys file into account */
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175 #ifdef ENABLE_SVR_PUBKEY_AUTH
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176 #define ENABLE_SVR_PUBKEY_OPTIONS
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177 #endif
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178
68
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179 #define ENABLE_CLI_PASSWORD_AUTH
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180 #define ENABLE_CLI_PUBKEY_AUTH
249
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181 #define ENABLE_CLI_INTERACT_AUTH
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182
441
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183 /* This variable can be used to set a password for client
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184 * authentication on the commandline. Beware of platforms
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185 * that don't protect environment variables of processes etc. Also
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186 * note that it will be provided for all "hidden" client-interactive
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187 * style prompts - if you want something more sophisticated, use
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188 * SSH_ASKPASS instead. Comment out this var to remove this functionality.*/
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189 #define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
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190
173
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191 /* Define this (as well as ENABLE_CLI_PASSWORD_AUTH) to allow the use of
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192 * a helper program for the ssh client. The helper program should be
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193 * specified in the SSH_ASKPASS environment variable, and dbclient
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194 * should be run with DISPLAY set and no tty. The program should
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195 * return the password on standard output */
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196 /*#define ENABLE_CLI_ASKPASS_HELPER*/
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197
149
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198 /* Random device to use - define either DROPBEAR_RANDOM_DEV or
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199 * DROPBEAR_PRNGD_SOCKET.
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200 * DROPBEAR_RANDOM_DEV is recommended on hosts with a good /dev/(u)random,
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201 * otherwise use run prngd (or egd if you want), specifying the socket.
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202 * The device will be queried for a few dozen bytes of seed a couple of times
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203 * per session (or more for very long-lived sessions). */
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204
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205 /* We'll use /dev/urandom by default, since /dev/random is too much hassle.
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206 * If system developers aren't keeping seeds between boots nor getting
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207 * any entropy from somewhere it's their own fault. */
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208 #define DROPBEAR_RANDOM_DEV "/dev/urandom"
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209
149
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210 /* prngd must be manually set up to produce output */
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211 /*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/
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212
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213 /* Specify the number of clients we will allow to be connected but
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214 * not yet authenticated. After this limit, connections are rejected */
277
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215 /* The first setting is per-IP, to avoid denial of service */
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216 #ifndef MAX_UNAUTH_PER_IP
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217 #define MAX_UNAUTH_PER_IP 5
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218 #endif
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219
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220 /* And then a global limit to avoid chewing memory if connections
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221 * come from many IPs */
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222 #ifndef MAX_UNAUTH_CLIENTS
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223 #define MAX_UNAUTH_CLIENTS 30
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224 #endif
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225
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226 /* Maximum number of failed authentication tries (server option) */
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227 #ifndef MAX_AUTH_TRIES
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228 #define MAX_AUTH_TRIES 10
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229 #endif
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230
437
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231 /* The default file to store the daemon's process ID, for shutdown
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232 scripts etc. This can be overridden with the -P flag */
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233 #ifndef DROPBEAR_PIDFILE
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234 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
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235 #endif
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236
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237 /* The command to invoke for xauth when using X11 forwarding.
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238 * "-q" for quiet */
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239 #ifndef XAUTH_COMMAND
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240 #define XAUTH_COMMAND "/usr/X11R6/bin/xauth -q"
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241 #endif
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242
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243 /* if you want to enable running an sftp server (such as the one included with
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244 * OpenSSH), set the path below. If the path isn't defined, sftp will not
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245 * be enabled */
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246 #ifndef SFTPSERVER_PATH
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247 #define SFTPSERVER_PATH "/usr/libexec/sftp-server"
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248 #endif
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249
66
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250 /* This is used by the scp binary when used as a client binary. If you're
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251 * not using the Dropbear client, you'll need to change it */
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252 #define _PATH_SSH_PROGRAM "/usr/bin/dbclient"
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253
349
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254 /* Whether to log commands executed by a client. This only logs the
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255 * (single) command sent to the server, not what a user did in a
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256 * shell/sftp session etc. */
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257 /* #define LOG_COMMANDS */
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258
448
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259 /* Window size limits. These tend to be a trade-off between memory
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260 usage and network performance: */
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261 /* Size of the network receive window. This amount of memory is allocated
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262 as a per-channel receive buffer. Increasing this value can make a
449
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263 significant difference to network performance. 24kB was empirically
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264 chosen for a 100mbit ethernet network. The value can be altered at
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265 runtime with the -W argument. */
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266 #define DEFAULT_RECV_WINDOW 24576
448
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267 /* Maximum size of a received SSH data packet - this _MUST_ be >= 32768
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268 in order to interoperate with other implementations */
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269 #define RECV_MAX_PAYLOAD_LEN 32768
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270 /* Maximum size of a transmitted data packet - this can be any value,
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271 though increasing it may not make a significant difference. */
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272 #define TRANS_MAX_PAYLOAD_LEN 16384
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273
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274 /* Ensure that data is transmitted every KEEPALIVE seconds. This can
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275 be overridden at runtime with -K. 0 disables keepalives */
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276 #define DEFAULT_KEEPALIVE 0
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277
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278 /* The default path. This will often get replaced by the shell */
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279 #define DEFAULT_PATH "/usr/bin:/bin"
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280
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281 /* Some other defines (that mostly should be left alone) are defined
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282 * in sysoptions.h */
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283 #include "sysoptions.h"
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284
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285 #endif /* _OPTIONS_H_ */