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annotate options.h @ 442:d82a2a44c684

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Add -u option to specify /dev/urandom instead
author Matt Johnston <matt@ucc.asn.au>
date Mon, 16 Apr 2007 13:39:50 +0000
parents fdf06a5a54e4
children 2cd2edfa11ee
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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 (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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69 /* Encryption - at least one required.
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70 * RFC Draft requires 3DES and recommends AES128 for interoperability.
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71 * Including multiple keysize variants the same cipher
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72 * (eg AES256 as well as AES128) will result in a minimal size increase.*/
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73 #define DROPBEAR_AES128_CBC
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74 #define DROPBEAR_3DES_CBC
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75 #define DROPBEAR_AES256_CBC
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76 #define DROPBEAR_BLOWFISH_CBC
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77 #define DROPBEAR_TWOFISH256_CBC
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78 #define DROPBEAR_TWOFISH128_CBC
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80 /* Message Integrity - at least one required.
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81 * RFC Draft requires sha1 and recommends sha1-96.
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82 * sha1-96 may be of use for slow links, as it has a smaller overhead.
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83 *
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84 * Note: there's no point disabling sha1 to save space, since it's used
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85 * for the random number generator and public-key cryptography anyway.
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86 * Disabling it here will just stop it from being used as the integrity portion
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87 * of the ssh protocol.
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88 *
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89 * These hashes are also used for public key fingerprints in logs.
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90 * If you disable MD5, Dropbear will fall back to SHA1 fingerprints,
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91 * which are not the standard form. */
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92 #define DROPBEAR_SHA1_HMAC
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93 #define DROPBEAR_SHA1_96_HMAC
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94 #define DROPBEAR_MD5_HMAC
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96 /* Hostkey/public key algorithms - at least one required, these are used
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97 * for hostkey as well as for verifying signatures with pubkey auth.
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98 * Removing either of these won't save very much space.
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99 * SSH2 RFC Draft requires dss, recommends rsa */
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100 #define DROPBEAR_RSA
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101 #define DROPBEAR_DSS
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102
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103 /* RSA can be vulnerable to timing attacks which use the time required for
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104 * signing to guess the private key. Blinding avoids this attack, though makes
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105 * signing operations slightly slower. */
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106 #define RSA_BLINDING
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107
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108 /* Define DSS_PROTOK to use PuTTY's method of generating the value k for dss,
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109 * rather than just from the random byte source. Undefining this will save you
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110 * ~4k in binary size with static uclibc, but your DSS hostkey could be exposed
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111 * if the random number source isn't good. In general this isn't required */
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112 /* #define DSS_PROTOK */
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114 /* Whether to do reverse DNS lookups. */
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115 #define DO_HOST_LOOKUP
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116
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117 /* Whether to print the message of the day (MOTD). This doesn't add much code
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118 * size */
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119 #define DO_MOTD
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120
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121 /* The MOTD file path */
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122 #ifndef MOTD_FILENAME
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123 #define MOTD_FILENAME "/etc/motd"
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124 #endif
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125
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126 /* Authentication Types - at least one required.
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127 RFC Draft requires pubkey auth, and recommends password */
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128
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129 /* Note: PAM auth is quite simple, and only works for PAM modules which just do
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130 * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
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131 * It's useful for systems like OS X where standard password crypts don't work,
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132 * but there's an interface via a PAM module - don't bother using it otherwise.
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133 * You can't enable both PASSWORD and PAM. */
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134
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135 #define ENABLE_SVR_PASSWORD_AUTH
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136 /*#define ENABLE_SVR_PAM_AUTH */ /* requires ./configure --enable-pam */
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137 #define ENABLE_SVR_PUBKEY_AUTH
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139 #define ENABLE_CLI_PASSWORD_AUTH
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140 #define ENABLE_CLI_PUBKEY_AUTH
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141 #define ENABLE_CLI_INTERACT_AUTH
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142
441
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143 /* This variable can be used to set a password for client
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144 * authentication on the commandline. Beware of platforms
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145 * that don't protect environment variables of processes etc. Also
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146 * note that it will be provided for all "hidden" client-interactive
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147 * style prompts - if you want something more sophisticated, use
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148 * SSH_ASKPASS instead. Comment out this var to remove this functionality.*/
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149 #define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
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150
173
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151 /* Define this (as well as ENABLE_CLI_PASSWORD_AUTH) to allow the use of
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152 * a helper program for the ssh client. The helper program should be
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153 * specified in the SSH_ASKPASS environment variable, and dbclient
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154 * should be run with DISPLAY set and no tty. The program should
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155 * return the password on standard output */
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156 /*#define ENABLE_CLI_ASKPASS_HELPER*/
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157
149
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158 /* Random device to use - define either DROPBEAR_RANDOM_DEV or
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159 * DROPBEAR_PRNGD_SOCKET.
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160 * DROPBEAR_RANDOM_DEV is recommended on hosts with a good /dev/(u)random,
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161 * otherwise use run prngd (or egd if you want), specifying the socket.
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162 * The device will be queried for a few dozen bytes of seed a couple of times
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163 * per session (or more for very long-lived sessions). */
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164
149
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165 /* If you are lacking entropy on the system then using /dev/urandom
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166 * will prevent Dropbear from blocking on the device. This could
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167 * however significantly reduce the security of your ssh connections
176
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168 * if the PRNG state becomes guessable - make sure you know what you are
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169 * doing if you change this. */
149
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170 #define DROPBEAR_RANDOM_DEV "/dev/random"
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171
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172 /* The -u flag on the commandline can also be used */
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173 #define DROPBEAR_URANDOM_DEV "/dev/urandom"
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174
149
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175 /* prngd must be manually set up to produce output */
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176 /*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/
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177
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178 /* Specify the number of clients we will allow to be connected but
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179 * not yet authenticated. After this limit, connections are rejected */
277
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180 /* The first setting is per-IP, to avoid denial of service */
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181 #ifndef MAX_UNAUTH_PER_IP
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182 #define MAX_UNAUTH_PER_IP 5
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183 #endif
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184
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185 /* And then a global limit to avoid chewing memory if connections
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186 * come from many IPs */
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187 #ifndef MAX_UNAUTH_CLIENTS
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188 #define MAX_UNAUTH_CLIENTS 30
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189 #endif
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190
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191 /* Maximum number of failed authentication tries (server option) */
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192 #ifndef MAX_AUTH_TRIES
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193 #define MAX_AUTH_TRIES 10
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194 #endif
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195
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196 /* The default file to store the daemon's process ID, for shutdown
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197 scripts etc. This can be overridden with the -P flag */
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198 #ifndef DROPBEAR_PIDFILE
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199 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
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200 #endif
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201
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202 /* The command to invoke for xauth when using X11 forwarding.
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203 * "-q" for quiet */
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204 #ifndef XAUTH_COMMAND
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205 #define XAUTH_COMMAND "/usr/X11R6/bin/xauth -q"
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206 #endif
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207
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208 /* if you want to enable running an sftp server (such as the one included with
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209 * OpenSSH), set the path below. If the path isn't defined, sftp will not
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210 * be enabled */
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211 #ifndef SFTPSERVER_PATH
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212 #define SFTPSERVER_PATH "/usr/libexec/sftp-server"
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213 #endif
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214
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215 /* This is used by the scp binary when used as a client binary. If you're
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216 * not using the Dropbear client, you'll need to change it */
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217 #define _PATH_SSH_PROGRAM "/usr/bin/dbclient"
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218
349
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219 /* Whether to log commands executed by a client. This only logs the
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220 * (single) command sent to the server, not what a user did in a
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221 * shell/sftp session etc. */
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222 /* #define LOG_COMMANDS */
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223
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224 /*******************************************************************
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225 * You shouldn't edit below here unless you know you need to.
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226 *******************************************************************/
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227
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228 #ifndef DROPBEAR_VERSION
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229 #define DROPBEAR_VERSION "0.49"
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230 #endif
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231
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232 #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
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233 #define PROGNAME "dropbear"
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234
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235 /* Spec recommends after one hour or 1 gigabyte of data. One hour
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236 * is a bit too verbose, so we try 8 hours */
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237 #ifndef KEX_REKEY_TIMEOUT
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238 #define KEX_REKEY_TIMEOUT (3600 * 8)
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239 #endif
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240 #ifndef KEX_REKEY_DATA
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241 #define KEX_REKEY_DATA (1<<30) /* 2^30 == 1GB, this value must be < INT_MAX */
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242 #endif
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243 /* Close connections to clients which haven't authorised after AUTH_TIMEOUT */
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244 #ifndef AUTH_TIMEOUT
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245 #define AUTH_TIMEOUT 300 /* we choose 5 minutes */
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246 #endif
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247
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248 /* Minimum key sizes for DSS and RSA */
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249 #ifndef MIN_DSS_KEYLEN
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250 #define MIN_DSS_KEYLEN 512
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251 #endif
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252 #ifndef MIN_RSA_KEYLEN
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253 #define MIN_RSA_KEYLEN 512
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254 #endif
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255
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256 #define MAX_BANNER_SIZE 2000 /* this is 25*80 chars, any more is foolish */
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257 #define MAX_BANNER_LINES 20 /* How many lines the client will display */
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258
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259 /* the number of NAME=VALUE pairs to malloc for environ, if we don't have
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260 * the clearenv() function */
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261 #define ENV_SIZE 100
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262
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263 #define MAX_CMD_LEN 1024 /* max length of a command */
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264 #define MAX_TERM_LEN 200 /* max length of TERM name */
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265
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266 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
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267 #define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
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268
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269 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
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270 ipv4 and ipv6 don't count twice */
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271
328
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272 /* Each port might have at least a v4 and a v6 address */
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273 #define MAX_LISTEN_ADDR (DROPBEAR_MAX_PORTS*3)
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274
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275 #define _PATH_TTY "/dev/tty"
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276
287
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277 #define _PATH_CP "/bin/cp"
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278
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279 /* Timeouts in seconds */
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280 #define SELECT_TIMEOUT 20
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281
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282 /* success/failure defines */
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283 #define DROPBEAR_SUCCESS 0
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284 #define DROPBEAR_FAILURE -1
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285
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286 /* various algorithm identifiers */
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287 #define DROPBEAR_KEX_DH_GROUP1 0
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288
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289 #define DROPBEAR_SIGNKEY_ANY 0
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290 #define DROPBEAR_SIGNKEY_RSA 1
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291 #define DROPBEAR_SIGNKEY_DSS 2
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292 #define DROPBEAR_SIGNKEY_NONE 3
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293
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294 #define DROPBEAR_COMP_NONE 0
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295 #define DROPBEAR_COMP_ZLIB 1
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296
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297 /* Required for pubkey auth */
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298 #if defined(ENABLE_SVR_PUBKEY_AUTH) || defined(DROPBEAR_CLIENT)
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299 #define DROPBEAR_SIGNKEY_VERIFY
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300 #endif
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301
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302 /* SHA1 is 20 bytes == 160 bits */
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303 #define SHA1_HASH_SIZE 20
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304 /* SHA512 is 64 bytes == 512 bits */
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305 #define SHA512_HASH_SIZE 64
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306 /* MD5 is 16 bytes = 128 bits */
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307 #define MD5_HASH_SIZE 16
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308
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309 /* largest of MD5 and SHA1 */
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310 #define MAX_MAC_LEN SHA1_HASH_SIZE
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311
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312
233
225e6822ef53 bytes/bits in a comment.
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313 #define MAX_KEY_LEN 32 /* 256 bits for aes256 etc */
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314 #define MAX_IV_LEN 20 /* must be same as max blocksize,
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315 and >= SHA1_HASH_SIZE */
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316 #define MAX_MAC_KEY 20
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317
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318 #define MAX_NAME_LEN 64 /* maximum length of a protocol name, isn't
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319 explicitly specified for all protocols (just
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320 for algos) but seems valid */
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321
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322 #define MAX_PROPOSED_ALGO 20
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323
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324 /* size/count limits */
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325
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326 #define MAX_PACKET_LEN 35000
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327 #define MIN_PACKET_LEN 16
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328 #define MAX_PAYLOAD_LEN 32768
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329
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330 #define MAX_TRANS_PAYLOAD_LEN 32768
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331 #define MAX_TRANS_PACKET_LEN (MAX_TRANS_PAYLOAD_LEN+50)
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332
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333 #define MAX_TRANS_WINDOW 500000000 /* 500MB is sufficient, stopping overflow */
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334 #define MAX_TRANS_WIN_INCR 500000000 /* overflow prevention */
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335
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336 #define MAX_STRING_LEN 1400 /* ~= MAX_PROPOSED_ALGO * MAX_NAME_LEN, also
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337 is the max length for a password etc */
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338
257
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339 /* For a 4096 bit DSS key, empirically determined */
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340 #define MAX_PUBKEY_SIZE 1700
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341 /* For a 4096 bit DSS key, empirically determined */
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342 #define MAX_PRIVKEY_SIZE 1700
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343
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344 /* The maximum size of the bignum portion of the kexhash buffer */
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345 /* Sect. 8 of the transport draft, K_S + e + f + K */
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346 #define KEXHASHBUF_MAX_INTS (1700 + 130 + 130 + 130)
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347
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348 #define DROPBEAR_MAX_SOCKS 2 /* IPv4, IPv6 are all we'll get for now. Revisit
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349 in a few years time.... */
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350
173
257f09a63dab * add SSH_ASKPASS support (based on patch from Paul Whittaker
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351 #define DROPBEAR_MAX_CLI_PASS 1024
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352
249
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353 #define DROPBEAR_MAX_CLI_INTERACT_PROMPTS 80 /* The number of prompts we'll
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354 accept for keyb-interactive
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355 auth */
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356
228
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357 #if defined(DROPBEAR_AES256_CBC) || defined(DROPBEAR_AES128_CBC)
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358 #define DROPBEAR_AES_CBC
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359 #endif
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360
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361 #if defined(DROPBEAR_TWOFISH256_CBC) || defined(DROPBEAR_TWOFISH128_CBC)
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362 #define DROPBEAR_TWOFISH_CBC
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363 #endif
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364
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365 #ifndef ENABLE_X11FWD
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366 #define DISABLE_X11FWD
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367 #endif
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368
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369 #ifndef ENABLE_AGENTFWD
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370 #define DISABLE_AGENTFWD
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371 #endif
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372
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efb5e0b335cf TCP forwarding works.
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373 #if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD)
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374 #define ENABLE_CLI_ANYTCPFWD
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375 #endif
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376
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377 #if defined(ENABLE_CLI_LOCALTCPFWD) || defined(ENABLE_SVR_REMOTETCPFWD)
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378 #define DROPBEAR_TCP_ACCEPT
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379 #endif
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380
206
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381 #if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD) || \
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382 defined(ENABLE_SVR_REMOTETCPFWD) || defined(ENABLE_SVR_LOCALTCPFWD) || \
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383 defined(ENABLE_AGENTFWD) || defined(ENABLE_X11FWD)
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384 #define USING_LISTENERS
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385 #endif
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386
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387 #if defined(DROPBEAR_CLIENT) || defined(ENABLE_SVR_PUBKEY_AUTH)
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388 #define DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */
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389 #endif
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390
119
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391 #if defined(ENABLE_SVR_PASSWORD_AUTH) && defined(ENABLE_SVR_PAM_AUTH)
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392 #error "You can't turn on PASSWORD and PAM auth both at once. Fix it in options.h"
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393 #endif
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394
149
ed9ca2a9705c Cleaned up the random code, use /dev/random by default,
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395 #if defined(DROPBEAR_RANDOM_DEV) && defined(DROPBEAR_PRNGD_SOCKET)
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396 #error "You can't turn on DROPBEAR_PRNGD_SOCKET and DROPBEAR_RANDOM_DEV at once"
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397 #endif
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398
ed9ca2a9705c Cleaned up the random code, use /dev/random by default,
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399 #if !defined(DROPBEAR_RANDOM_DEV) && !defined(DROPBEAR_PRNGD_SOCKET)
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400 #error "You must choose one of DROPBEAR_PRNGD_SOCKET or DROPBEAR_RANDOM_DEV in options.h"
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401 #endif
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402
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403 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
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404 * code, if we're just compiling as client or server */
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405 #if defined(DROPBEAR_SERVER) && defined(DROPBEAR_CLIENT)
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406
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407 #define IS_DROPBEAR_SERVER (ses.isserver == 1)
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408 #define IS_DROPBEAR_CLIENT (ses.isserver == 0)
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409
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410 #elif defined(DROPBEAR_SERVER)
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411
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412 #define IS_DROPBEAR_SERVER 1
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413 #define IS_DROPBEAR_CLIENT 0
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414
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415 #elif defined(DROPBEAR_CLIENT)
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416
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417 #define IS_DROPBEAR_SERVER 0
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418 #define IS_DROPBEAR_CLIENT 1
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419
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420 #else
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421 #error You must compiled with either DROPBEAR_CLIENT or DROPBEAR_SERVER selected
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422 #endif
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423
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
424 #endif /* _OPTIONS_H_ */