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Improved signkey code
author Matt Johnston <matt@ucc.asn.au>
date Tue, 03 Aug 2004 15:51:55 +0000
parents 942b22d7dd1c
children 4b53a43f0082
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #ifndef _OPTIONS_H_
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26 #define _OPTIONS_H_
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27
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28 /******************************************************************
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29 * Define compile-time options below - the "#ifndef DROPBEAR_XXX .... #endif"
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30 * parts are to allow for commandline -DDROPBEAR_XXX options etc.
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31 ******************************************************************/
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32
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33 #ifndef DROPBEAR_PORT
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34 #define DROPBEAR_PORT 22
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35 #endif
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36
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37 /* Default hostkey paths - these can be specified on the command line */
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38 #ifndef DSS_PRIV_FILENAME
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39 #define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
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40 #endif
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41 #ifndef RSA_PRIV_FILENAME
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42 #define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
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43 #endif
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44
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45 /* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is
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46 * perhaps 20% slower for pubkey operations (it is probably worth experimenting
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47 * if you want to use this) */
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48 /*#define NO_FAST_EXPTMOD*/
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49
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50 /* Enable X11 Forwarding */
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51 #define ENABLE_X11FWD
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52
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53 /* Enable TCP Fowarding */
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54 /* OpenSSH's "-L" style forwarding (client port forwarded via server) */
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55 #define ENABLE_LOCALTCPFWD
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56 /* OpenSSH's "-R" style forwarding (server port forwarded via client) */
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57 #define ENABLE_REMOTETCPFWD
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58
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59 /* Enable Authentication Agent Forwarding */
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60 #define ENABLE_AGENTFWD
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61
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62 /* Encryption - at least one required.
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63 * RFC Draft requires 3DES, and recommends Blowfish, AES128 & Twofish128 */
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64 #define DROPBEAR_AES128_CBC
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65 #define DROPBEAR_BLOWFISH_CBC
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66 #define DROPBEAR_TWOFISH128_CBC
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67 #define DROPBEAR_3DES_CBC
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68
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69 /* Integrity - at least one required.
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70 * RFC Draft requires sha1-hmac, and recommends md5-hmac.
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71 *
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72 * Note: there's no point disabling sha1 to save space, since it's used in the
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73 * for the random number generator and public-key cryptography anyway.
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74 * Disabling it here will just stop it from being used as the integrity portion
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75 * of the ssh protocol.
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76 *
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77 * These are also used for key fingerprints in logs (when pubkey auth is used),
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78 * MD5 fingerprints are printed if available, however SHA1 fingerprints will be
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79 * generated otherwise. This isn't exactly optimal, although SHA1 fingerprints
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80 * are not too hard to create from pubkeys if required. */
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81 #define DROPBEAR_SHA1_HMAC
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82 #define DROPBEAR_MD5_HMAC
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83
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84 /* Hostkey/public key algorithms - at least one required, these are used
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85 * for hostkey as well as for verifying signatures with pubkey auth.
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86 * Removing either of these won't save very much space.
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87 * SSH2 RFC Draft requires dss, recommends rsa */
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88 #define DROPBEAR_RSA
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89 #define DROPBEAR_DSS
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90
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91 /* Define DSS_PROTOK to use PuTTY's method of generating the value k for dss,
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92 * rather than just from the random byte source. Undefining this will save you
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93 * ~4k in binary size with static uclibc, but your DSS hostkey could be exposed
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94 * if the random number source isn't good. In general this isn't required */
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95 /* #define DSS_PROTOK */
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96
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97 /* Whether to do reverse DNS lookups. This is advisable, though will add
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98 * code size with gethostbyname() etc, so for very small environments where
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99 * you are statically linking, you might want to undefine this */
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100 #define DO_HOST_LOOKUP
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101
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102 /* Whether to print the message of the day (MOTD). This doesn't add much code
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103 * size */
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104 #define DO_MOTD
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105
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106 /* The MOTD file path */
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107 #ifndef MOTD_FILENAME
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108 #define MOTD_FILENAME "/etc/motd"
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109 #endif
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110
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111 /* Authentication types to enable, at least one required.
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112 RFC Draft requires pubkey auth, and recommends password */
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113 #define DROPBEAR_PASSWORD_AUTH
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114 #define DROPBEAR_PUBKEY_AUTH
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115
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116 /* Random device to use - you must specify _one only_.
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117 * DEV_RANDOM is recommended on hosts with a good /dev/urandom, otherwise use
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118 * PRNGD and run prngd, specifying the socket. This device must be able to
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119 * produce a large amount of random data, so using /dev/random or Entropy
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120 * Gathering Daemon (egd) may result in halting, as it waits for more random
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121 * data */
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122 #define DROPBEAR_DEV_URANDOM /* use /dev/urandom */
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123
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124 /*#undef DROPBEAR_PRNGD */ /* use prngd socket - you must manually set up prngd
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125 to produce output */
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126 #ifndef DROPBEAR_PRNGD_SOCKET
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127 #define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"
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128 #endif
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129
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130 /* Specify the number of clients we will allow to be connected but
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131 * not yet authenticated. After this limit, connections are rejected */
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132 #ifndef MAX_UNAUTH_CLIENTS
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133 #define MAX_UNAUTH_CLIENTS 30
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134 #endif
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135
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136 /* Maximum number of failed authentication tries */
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137 #ifndef MAX_AUTH_TRIES
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138 #define MAX_AUTH_TRIES 10
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139 #endif
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140
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141 /* The file to store the daemon's process ID, for shutdown scripts etc */
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142 #ifndef DROPBEAR_PIDFILE
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143 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
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144 #endif
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145
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146 /* The command to invoke for xauth when using X11 forwarding.
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147 * "-q" for quiet */
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148 #ifndef XAUTH_COMMAND
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149 #define XAUTH_COMMAND "/usr/X11R6/bin/xauth -q"
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150 #endif
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151
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152 /* if you want to enable running an sftp server (such as the one included with
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153 * OpenSSH), set the path below. If the path isn't defined, sftp will not
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154 * be enabled */
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155 #ifndef SFTPSERVER_PATH
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156 #define SFTPSERVER_PATH "/usr/libexec/sftp-server"
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157 #endif
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158
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159 /* This is used by the scp binary when used as a client binary */
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160 #define _PATH_SSH_PROGRAM "/usr/bin/ssh"
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161
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162 /* Multi-purpose binary configuration has now moved. Look at the top
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163 * of the Makefile for instructions, or INSTALL */
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164
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165 /*******************************************************************
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166 * You shouldn't edit below here unless you know you need to.
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167 *******************************************************************/
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168
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169 #ifndef DROPBEAR_VERSION
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170 #define DROPBEAR_VERSION "0.41-and-client"
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171 #endif
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172
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173 #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
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174 #define PROGNAME "dropbear"
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175
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176 /* Spec recommends after one hour or 1 gigabyte of data. One hour
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177 * is a bit too verbose, so we try 8 hours */
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178 #ifndef KEX_REKEY_TIMEOUT
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179 #define KEX_REKEY_TIMEOUT (3600 * 8)
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180 #endif
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181 #ifndef KEX_REKEY_DATA
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182 #define KEX_REKEY_DATA (1<<30) /* 2^30 == 1GB, this value must be < INT_MAX */
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183 #endif
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184 /* Close connections to clients which haven't authorised after AUTH_TIMEOUT */
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185 #ifndef AUTH_TIMEOUT
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186 #define AUTH_TIMEOUT 300 /* we choose 5 minutes */
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187 #endif
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188
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189 /* Minimum key sizes for DSS and RSA */
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190 #ifndef MIN_DSS_KEYLEN
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191 #define MIN_DSS_KEYLEN 512
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192 #endif
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193 #ifndef MIN_RSA_KEYLEN
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194 #define MIN_RSA_KEYLEN 512
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195 #endif
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196
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197 #define MAX_BANNER_SIZE 2000 /* this is 25*80 chars, any more is foolish */
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198 #define MAX_BANNER_LINES 20 /* How many lines the client will display */
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199
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200 #define DEV_URANDOM "/dev/urandom"
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201
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202 /* the number of NAME=VALUE pairs to malloc for environ, if we don't have
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203 * the clearenv() function */
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204 #define ENV_SIZE 100
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205
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206 #define MAX_CMD_LEN 1024 /* max length of a command */
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207 #define MAX_TERM_LEN 200 /* max length of TERM name */
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208
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209 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
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210 #define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
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211
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212 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
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213 ipv4 and ipv6 don't count twice */
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214
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215 #define _PATH_TTY "/dev/tty"
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216
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217 /* Timeouts in seconds */
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218 #define SELECT_TIMEOUT 20
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219
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220 /* success/failure defines */
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221 #define DROPBEAR_SUCCESS 0
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222 #define DROPBEAR_FAILURE -1
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223
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224 /* various algorithm identifiers */
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225 #define DROPBEAR_KEX_DH_GROUP1 0
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226
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227 #define DROPBEAR_SIGNKEY_ANY 0
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228 #define DROPBEAR_SIGNKEY_RSA 1
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229 #define DROPBEAR_SIGNKEY_DSS 2
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230 #define DROPBEAR_SIGNKEY_NONE 3
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231
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232 #define DROPBEAR_COMP_NONE 0
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233 #define DROPBEAR_COMP_ZLIB 1
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234
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235 /* Required for pubkey auth */
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236 #if defined(DROPBEAR_PUBKEY_AUTH) || defined(DROPBEAR_CLIENT)
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237 #define DROPBEAR_SIGNKEY_VERIFY
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238 #endif
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239
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240 /* SHA1 is 20 bytes == 160 bits */
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241 #define SHA1_HASH_SIZE 20
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242 /* SHA512 is 64 bytes == 512 bits */
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243 #define SHA512_HASH_SIZE 64
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244 /* MD5 is 16 bytes = 128 bits */
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245 #define MD5_HASH_SIZE 16
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246
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247 /* largest of MD5 and SHA1 */
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248 #define MAX_MAC_LEN SHA1_HASH_SIZE
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249
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250
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251 #define MAX_KEY_LEN 24 /* 3DES requires a 24 byte key */
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252 #define MAX_IV_LEN 20 /* must be same as max blocksize,
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253 and >= SHA1_HASH_SIZE */
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254 #define MAX_MAC_KEY 20
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255
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256 #define MAX_NAME_LEN 64 /* maximum length of a protocol name, isn't
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257 explicitly specified for all protocols (just
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258 for algos) but seems valid */
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259
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260 #define MAX_PROPOSED_ALGO 20
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261
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262 /* size/count limits */
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263 #define MAX_LISTEN_ADDR 10
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264
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265 #define MAX_PACKET_LEN 35000
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266 #define MIN_PACKET_LEN 16
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267 #define MAX_PAYLOAD_LEN 32768
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268
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269 #define MAX_TRANS_PAYLOAD_LEN 32768
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270 #define MAX_TRANS_PACKET_LEN (MAX_TRANS_PAYLOAD_LEN+50)
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271
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272 #define MAX_TRANS_WINDOW 500000000 /* 500MB is sufficient, stopping overflow */
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273 #define MAX_TRANS_WIN_INCR 500000000 /* overflow prevention */
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274
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275 #define MAX_STRING_LEN 1400 /* ~= MAX_PROPOSED_ALGO * MAX_NAME_LEN, also
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276 is the max length for a password etc */
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277
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278 #ifndef ENABLE_X11FWD
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279 #define DISABLE_X11FWD
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280 #endif
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281
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282 #ifndef ENABLE_AGENTFWD
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283 #define DISABLE_AGENTFWD
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284 #endif
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285
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286 #ifndef ENABLE_LOCALTCPFWD
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287 #define DISABLE_TCPDIRECT
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288 #endif
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289
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290 #ifndef ENABLE_REMOTETCPFWD
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291 #define DISABLE_REMOTETCPFWD
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292 #endif
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293
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294 #if defined(ENABLE_REMOTETCPFWD) || defined(ENABLE_LOCALTCPFWD) || \
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295 defined(ENABLE_AGENTFWD) || defined(ENABLE_X11FWD)
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296 #define USING_LISTENERS
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297 #endif
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298
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299 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
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300 * code, if we're just compiling as client or server */
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301 #if defined(DROPBEAR_SERVER) && defined(DROPBEAR_CLIENT)
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302
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303 #define IS_DROPBEAR_SERVER (ses.isserver == 1)
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304 #define IS_DROPBEAR_CLIENT (ses.isserver == 0)
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305
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306 #elif defined(DROPBEAR_SERVER)
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307
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308 #define IS_DROPBEAR_SERVER 1
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309 #define IS_DROPBEAR_CLIENT 0
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310
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311 #elif defined(DROPBEAR_CLIENT)
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312
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313 #define IS_DROPBEAR_SERVER 0
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314 #define IS_DROPBEAR_CLIENT 1
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315
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316 #else
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317 #error You must compiled with either DROPBEAR_CLIENT or DROPBEAR_SERVER selected
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318 #endif
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319
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320 #endif /* _OPTIONS_H_ */