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annotate options.h @ 27:08da099e8337

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- Rename common-packet.c to packet.c - buf_burn the unencrypted read/write payload buffers after use to avoid sensitive contents sitting in memory for too long
author Matt Johnston <matt@ucc.asn.au>
date Tue, 27 Jul 2004 02:14:42 +0000
parents 0969767bca0d
children f789045062e6
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 #define DROPBEAR_SERVER
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33 //#define DROPBEAR_CLIENT
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35 #ifndef DROPBEAR_PORT
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36 #define DROPBEAR_PORT 22
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37 #endif
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38
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39 /* Default hostkey paths - these can be specified on the command line */
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40 #ifndef DSS_PRIV_FILENAME
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41 #define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
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42 #endif
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43 #ifndef RSA_PRIV_FILENAME
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44 #define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
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45 #endif
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46
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47 /* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is
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48 * perhaps 20% slower for pubkey operations (it is probably worth experimenting
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49 * if you want to use this) */
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50 /*#define NO_FAST_EXPTMOD*/
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51 #define DROPBEAR_SMALL_CODE
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52
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53 /* Enable X11 Forwarding */
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54 #define ENABLE_X11FWD
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55
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56 /* Enable TCP Fowarding */
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57 /* OpenSSH's "-L" style forwarding (client port forwarded via server) */
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58 #define ENABLE_LOCALTCPFWD
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59 /* OpenSSH's "-R" style forwarding (server port forwarded via client) */
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60 #define ENABLE_REMOTETCPFWD
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61
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62 /* Enable Authentication Agent Forwarding */
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63 #define ENABLE_AGENTFWD
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64
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65 /* Encryption - at least one required.
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66 * RFC Draft requires 3DES, and recommends Blowfish, AES128 & Twofish128 */
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67 #define DROPBEAR_AES128_CBC
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68 #define DROPBEAR_BLOWFISH_CBC
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69 #define DROPBEAR_TWOFISH128_CBC
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70 #define DROPBEAR_3DES_CBC
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71
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72 /* Integrity - at least one required.
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73 * RFC Draft requires sha1-hmac, and recommends md5-hmac.
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74 *
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75 * Note: there's no point disabling sha1 to save space, since it's used in the
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76 * for the random number generator and public-key cryptography anyway.
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77 * Disabling it here will just stop it from being used as the integrity portion
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78 * of the ssh protocol.
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79 *
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80 * These are also used for key fingerprints in logs (when pubkey auth is used),
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81 * MD5 fingerprints are printed if available, however SHA1 fingerprints will be
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82 * generated otherwise. This isn't exactly optimal, although SHA1 fingerprints
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83 * are not too hard to create from pubkeys if required. */
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84 #define DROPBEAR_SHA1_HMAC
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85 #define DROPBEAR_MD5_HMAC
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86
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87 /* Hostkey/public key algorithms - at least one required, these are used
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88 * for hostkey as well as for verifying signatures with pubkey auth.
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89 * Removing either of these won't save very much space.
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90 * SSH2 RFC Draft requires dss, recommends rsa */
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91 #define DROPBEAR_RSA
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92 #define DROPBEAR_DSS
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93
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94 /* Define DSS_PROTOK to use PuTTY's method of generating the value k for dss,
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95 * rather than just from the random byte source. Undefining this will save you
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96 * ~4k in binary size with static uclibc, but your DSS hostkey could be exposed
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97 * if the random number source isn't good. In general this isn't required */
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98 /* #define DSS_PROTOK */
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99
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100 /* Whether to do reverse DNS lookups. This is advisable, though will add
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101 * code size with gethostbyname() etc, so for very small environments where
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102 * you are statically linking, you might want to undefine this */
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103 #define DO_HOST_LOOKUP
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104
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105 /* Whether to print the message of the day (MOTD). This doesn't add much code
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106 * size */
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107 #define DO_MOTD
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108
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109 /* The MOTD file path */
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110 #ifndef MOTD_FILENAME
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111 #define MOTD_FILENAME "/etc/motd"
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112 #endif
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113
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114 /* Authentication types to enable, at least one required.
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115 RFC Draft requires pubkey auth, and recommends password */
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116 #define DROPBEAR_PASSWORD_AUTH
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117 #define DROPBEAR_PUBKEY_AUTH
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118
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119 /* Random device to use - you must specify _one only_.
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120 * DEV_RANDOM is recommended on hosts with a good /dev/urandom, otherwise use
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121 * PRNGD and run prngd, specifying the socket. This device must be able to
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122 * produce a large amount of random data, so using /dev/random or Entropy
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123 * Gathering Daemon (egd) may result in halting, as it waits for more random
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124 * data */
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125 #define DROPBEAR_DEV_URANDOM /* use /dev/urandom */
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126
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127 /*#undef DROPBEAR_PRNGD */ /* use prngd socket - you must manually set up prngd
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128 to produce output */
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129 #ifndef DROPBEAR_PRNGD_SOCKET
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130 #define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"
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131 #endif
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132
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133 /* Specify the number of clients we will allow to be connected but
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134 * not yet authenticated. After this limit, connections are rejected */
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135 #ifndef MAX_UNAUTH_CLIENTS
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136 #define MAX_UNAUTH_CLIENTS 30
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137 #endif
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138
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139 /* Maximum number of failed authentication tries */
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140 #ifndef MAX_AUTH_TRIES
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141 #define MAX_AUTH_TRIES 10
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142 #endif
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143
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144 /* The file to store the daemon's process ID, for shutdown scripts etc */
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145 #ifndef DROPBEAR_PIDFILE
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146 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
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147 #endif
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148
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149 /* The command to invoke for xauth when using X11 forwarding.
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150 * "-q" for quiet */
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151 #ifndef XAUTH_COMMAND
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152 #define XAUTH_COMMAND "/usr/X11R6/bin/xauth -q"
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153 #endif
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154
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155 /* if you want to enable running an sftp server (such as the one included with
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156 * OpenSSH), set the path below. If the path isn't defined, sftp will not
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157 * be enabled */
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158 #ifndef SFTPSERVER_PATH
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159 #define SFTPSERVER_PATH "/usr/libexec/sftp-server"
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160 #endif
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161
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162 /* This is used by the scp binary when used as a client binary */
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163 #define _PATH_SSH_PROGRAM "/usr/bin/ssh"
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164
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165 /* Multi-purpose binary configuration - if you want to make the combined
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166 * binary, first define DROPBEAR_MULTI, and then define which of the three
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167 * components you want. You should then compile Dropbear with
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168 * "make clean; make dropbearmulti". You'll need to install the binary
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169 * manually, see MULTI for details */
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170
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171 /* #define DROPBEAR_MULTI */
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172
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173 /* The three multi binaries: dropbear, dropbearkey, dropbearconvert
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174 * Comment out these if you don't want some of them */
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175 #define DBMULTI_DROPBEAR
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176 #define DBMULTI_KEY
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177 #define DBMULTI_CONVERT
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178
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179
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180 /*******************************************************************
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181 * You shouldn't edit below here unless you know you need to.
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182 *******************************************************************/
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183
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184 #ifndef DROPBEAR_VERSION
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185 #define DROPBEAR_VERSION "0.41-and-client"
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186 #endif
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187
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188 #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
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189 #define PROGNAME "dropbear"
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190
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191 /* Spec recommends after one hour or 1 gigabyte of data. One hour
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192 * is a bit too verbose, so we try 8 hours */
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193 #ifndef KEX_REKEY_TIMEOUT
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194 #define KEX_REKEY_TIMEOUT (3600 * 8)
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195 #endif
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196 #ifndef KEX_REKEY_DATA
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197 #define KEX_REKEY_DATA (1<<30) /* 2^30 == 1GB, this value must be < INT_MAX */
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198 #endif
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199 /* Close connections to clients which haven't authorised after AUTH_TIMEOUT */
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200 #ifndef AUTH_TIMEOUT
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201 #define AUTH_TIMEOUT 300 /* we choose 5 minutes */
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202 #endif
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203
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204 /* Minimum key sizes for DSS and RSA */
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205 #ifndef MIN_DSS_KEYLEN
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206 #define MIN_DSS_KEYLEN 512
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207 #endif
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208 #ifndef MIN_RSA_KEYLEN
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209 #define MIN_RSA_KEYLEN 512
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210 #endif
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211
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212 #define MAX_BANNER_SIZE 2000 /* this is 25*80 chars, any more is foolish */
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213
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214 #define DEV_URANDOM "/dev/urandom"
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215
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216 /* the number of NAME=VALUE pairs to malloc for environ, if we don't have
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217 * the clearenv() function */
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218 #define ENV_SIZE 100
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219
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220 #define MAX_CMD_LEN 1024 /* max length of a command */
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221 #define MAX_TERM_LEN 200 /* max length of TERM name */
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222
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223 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
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224 #define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
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225
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226 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
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227 ipv4 and ipv6 don't count twice */
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228
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229 #define _PATH_TTY "/dev/tty"
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230
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231 /* Timeouts in seconds */
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232 #define SELECT_TIMEOUT 20
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233
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234 /* success/failure defines */
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235 #define DROPBEAR_SUCCESS 0
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236 #define DROPBEAR_FAILURE -1
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237
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238 /* various algorithm identifiers */
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239 #define DROPBEAR_KEX_DH_GROUP1 0
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240
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241 #define DROPBEAR_SIGNKEY_ANY 0
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242 #define DROPBEAR_SIGNKEY_RSA 1
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243 #define DROPBEAR_SIGNKEY_DSS 2
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244
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245 #define DROPBEAR_COMP_NONE 0
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246 #define DROPBEAR_COMP_ZLIB 1
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247
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248 /* Required for pubkey auth */
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249 #ifdef DROPBEAR_PUBKEY_AUTH
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250 #define DROPBEAR_SIGNKEY_VERIFY
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251 #endif
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252
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253 /* SHA1 is 20 bytes == 160 bits */
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254 #define SHA1_HASH_SIZE 20
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255 /* SHA512 is 64 bytes == 512 bits */
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256 #define SHA512_HASH_SIZE 64
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257 /* MD5 is 16 bytes = 128 bits */
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258 #define MD5_HASH_SIZE 16
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259
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260 /* largest of MD5 and SHA1 */
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261 #define MAX_MAC_LEN SHA1_HASH_SIZE
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262
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263
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264 #define MAX_KEY_LEN 24 /* 3DES requires a 24 byte key */
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265 #define MAX_IV_LEN 20 /* must be same as max blocksize,
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266 and >= SHA1_HASH_SIZE */
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267 #define MAX_MAC_KEY 20
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268
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269 #define MAX_NAME_LEN 64 /* maximum length of a protocol name, isn't
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270 explicitly specified for all protocols (just
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271 for algos) but seems valid */
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272
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273 #define MAX_PROPOSED_ALGO 20
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274
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275 /* size/count limits */
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276 #define MAX_LISTEN_ADDR 10
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277
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278 #define MAX_PACKET_LEN 35000
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279 #define MIN_PACKET_LEN 16
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280 #define MAX_PAYLOAD_LEN 32768
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281
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282 #define MAX_TRANS_PAYLOAD_LEN 32768
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283 #define MAX_TRANS_PACKET_LEN (MAX_TRANS_PAYLOAD_LEN+50)
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284
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285 #define MAX_TRANS_WINDOW 500000000 /* 500MB is sufficient, stopping overflow */
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286 #define MAX_TRANS_WIN_INCR 500000000 /* overflow prevention */
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287
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288 #define MAX_STRING_LEN 1400 /* ~= MAX_PROPOSED_ALGO * MAX_NAME_LEN, also
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289 is the max length for a password etc */
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290
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291 #ifndef ENABLE_X11FWD
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292 #define DISABLE_X11FWD
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293 #endif
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294
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295 #ifndef ENABLE_AGENTFWD
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296 #define DISABLE_AGENTFWD
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297 #endif
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298
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299 #ifndef ENABLE_LOCALTCPFWD
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300 #define DISABLE_TCPDIRECT
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301 #endif
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302
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303 #ifndef ENABLE_REMOTETCPFWD
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304 #define DISABLE_REMOTETCPFWD
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305 #endif
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306
13
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307 #if defined(ENABLE_REMOTETCPFWD) || defined(ENABLE_LOCALTCPFWD) || \
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308 defined(ENABLE_AGENTFWD) || defined(ENABLE_X11FWD)
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309 #define USING_LISTENERS
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310 #endif
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311
4
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312 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
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313 * code, if we're just compiling as client or server */
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314 #if defined(DROPBEAR_SERVER) && defined(DROPBEAR_CLIENT)
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315
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316 #define IS_DROPBEAR_SERVER (ses.isserver == 1)
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317 #define IS_DROPBEAR_CLIENT (ses.isserver == 0)
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318
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319 #elif defined(DROPBEAR_SERVER)
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320
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321 #define IS_DROPBEAR_SERVER 1
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322 #define IS_DROPBEAR_CLIENT 0
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323
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324 #elif defined(DROPBEAR_CLIENT)
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325
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326 #define IS_DROPBEAR_SERVER 0
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327 #define IS_DROPBEAR_CLIENT 1
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328
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329 #else
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330 #error You must compiled with either DROPBEAR_CLIENT or DROPBEAR_SERVER selected
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331 #endif
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332
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333 #endif /* _OPTIONS_H_ */