Mercurial > dropbear
annotate options.h @ 511:582cb38e4eb5 insecure-nocrypto
propagate from branch 'au.asn.ucc.matt.dropbear' (head cdcc3c729e29544e8b98a408e2dc60e4483dfd2a)
to branch 'au.asn.ucc.matt.dropbear.insecure-nocrypto' (head 0ca38a1cf349f7426ac9de34ebe4c3e3735effab)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 06 Nov 2008 13:16:55 +0000 |
parents | 461c4b1fb35f b85507ade010 |
children | 0129fd8ccc71 |
rev | line source |
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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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4 |
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5 #ifndef _OPTIONS_H_ |
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6 #define _OPTIONS_H_ |
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7 |
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8 /****************************************************************** |
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9 * Define compile-time options below - the "#ifndef DROPBEAR_XXX .... #endif" |
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10 * parts are to allow for commandline -DDROPBEAR_XXX options etc. |
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11 ******************************************************************/ |
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12 |
112 | 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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55 |
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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 |
64 | 60 #define ENABLE_CLI_LOCALTCPFWD |
61 #define ENABLE_CLI_REMOTETCPFWD | |
62 | |
63 #define ENABLE_SVR_LOCALTCPFWD | |
64 #define ENABLE_SVR_REMOTETCPFWD | |
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65 |
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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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68 |
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69 |
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70 /* Note: Both ENABLE_CLI_PROXYCMD and ENABLE_CLI_NETCAT must be set to |
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71 * allow multihop dbclient connections */ |
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72 |
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73 /* Allow using -J <proxycommand> to run the connection through a |
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74 pipe to a program, rather the normal TCP connection */ |
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75 #define ENABLE_CLI_PROXYCMD |
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76 |
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77 /* Enable "Netcat mode" option. This will forward standard input/output |
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78 * to a remote TCP-forwarded connection */ |
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79 #define ENABLE_CLI_NETCAT |
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80 |
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81 /* Encryption - at least one required. |
502 | 82 * Protocol RFC requires 3DES and recommends AES128 for interoperability. |
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83 * Including multiple keysize variants the same cipher |
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84 * (eg AES256 as well as AES128) will result in a minimal size increase.*/ |
502 | 85 #define DROPBEAR_AES128 |
86 #define DROPBEAR_3DES | |
87 #define DROPBEAR_AES256 | |
88 #define DROPBEAR_BLOWFISH | |
89 #define DROPBEAR_TWOFISH256 | |
90 #define DROPBEAR_TWOFISH128 | |
91 | |
92 /* Enable "Counter Mode" for ciphers. This is more secure than normal | |
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93 * CBC mode against certain attacks. This adds around 1kB to binary |
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94 * size and is recommended for most cases */ |
502 | 95 #define DROPBEAR_ENABLE_CTR_MODE |
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96 /* You can compile with no encryption if you want. In some circumstances |
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97 * this could be safe securitywise, though make sure you know what |
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98 * you're doing. Anyone can see everything that goes over the wire, so |
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99 * the only safe auth method is public key. You'll have to disable all other |
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100 * ciphers above in the client if you want to use this, or implement cipher |
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101 * prioritisation in cli-runopts. |
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102 * |
361 | 103 * The best way to do things is probably make normal compile of dropbear with |
104 * all ciphers including "none" as the server, then recompile a special | |
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105 * "dbclient-insecure" client. */ |
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106 #define DROPBEAR_NONE_CIPHER |
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107 |
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108 /* Message Integrity - at least one required. |
502 | 109 * Protocol RFC requires sha1 and recommends sha1-96. |
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110 * sha1-96 may be of use for slow links, as it has a smaller overhead. |
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111 * |
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112 * Note: there's no point disabling sha1 to save space, since it's used |
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113 * for the random number generator and public-key cryptography anyway. |
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114 * Disabling it here will just stop it from being used as the integrity portion |
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115 * of the ssh protocol. |
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116 * |
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117 * These hashes are also used for public key fingerprints in logs. |
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118 * If you disable MD5, Dropbear will fall back to SHA1 fingerprints, |
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119 * which are not the standard form. */ |
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120 #define DROPBEAR_SHA1_HMAC |
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121 #define DROPBEAR_SHA1_96_HMAC |
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122 #define DROPBEAR_MD5_HMAC |
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123 |
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124 /* You can also disable integrity. Don't bother disabling this if you're |
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125 * still using a cipher, it's relatively cheap. Don't disable this if you're |
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126 * using 'none' cipher, since it's dead simple to run arbitrary commands |
361 | 127 * on the remote host. Beware. */ |
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128 /*#define DROPBEAR_NONE_INTEGRITY*/ |
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129 |
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130 /* Hostkey/public key algorithms - at least one required, these are used |
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131 * for hostkey as well as for verifying signatures with pubkey auth. |
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132 * Removing either of these won't save very much space. |
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133 * SSH2 RFC Draft requires dss, recommends rsa */ |
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134 #define DROPBEAR_RSA |
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135 #define DROPBEAR_DSS |
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136 |
216
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137 /* RSA can be vulnerable to timing attacks which use the time required for |
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138 * signing to guess the private key. Blinding avoids this attack, though makes |
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139 * signing operations slightly slower. */ |
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140 #define RSA_BLINDING |
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141 |
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142 /* Define DSS_PROTOK to use PuTTY's method of generating the value k for dss, |
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143 * rather than just from the random byte source. Undefining this will save you |
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144 * ~4k in binary size with static uclibc, but your DSS hostkey could be exposed |
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145 * if the random number source isn't good. In general this isn't required */ |
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146 /* #define DSS_PROTOK */ |
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147 |
172
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148 /* Whether to do reverse DNS lookups. */ |
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149 #define DO_HOST_LOOKUP |
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150 |
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151 /* Whether to print the message of the day (MOTD). This doesn't add much code |
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152 * size */ |
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153 #define DO_MOTD |
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154 |
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155 /* The MOTD file path */ |
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156 #ifndef MOTD_FILENAME |
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157 #define MOTD_FILENAME "/etc/motd" |
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158 #endif |
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159 |
121 | 160 /* Authentication Types - at least one required. |
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161 RFC Draft requires pubkey auth, and recommends password */ |
121 | 162 |
176 | 163 /* Note: PAM auth is quite simple, and only works for PAM modules which just do |
164 * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c). | |
165 * It's useful for systems like OS X where standard password crypts don't work, | |
166 * but there's an interface via a PAM module - don't bother using it otherwise. | |
167 * You can't enable both PASSWORD and PAM. */ | |
121 | 168 |
499
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169 #define ENABLE_SVR_PASSWORD_AUTH |
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170 /* PAM requires ./configure --enable-pam */ |
502 | 171 /*#define ENABLE_SVR_PAM_AUTH*/ |
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172 #define ENABLE_SVR_PUBKEY_AUTH |
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173 |
475
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174 /* Wether to ake public key options in authorized_keys file into account */ |
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175 #ifdef ENABLE_SVR_PUBKEY_AUTH |
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176 #define ENABLE_SVR_PUBKEY_OPTIONS |
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177 #endif |
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178 |
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179 #define ENABLE_CLI_PASSWORD_AUTH |
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180 #define ENABLE_CLI_PUBKEY_AUTH |
249
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181 #define ENABLE_CLI_INTERACT_AUTH |
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182 |
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183 /* This variable can be used to set a password for client |
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184 * authentication on the commandline. Beware of platforms |
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185 * that don't protect environment variables of processes etc. Also |
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186 * note that it will be provided for all "hidden" client-interactive |
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187 * style prompts - if you want something more sophisticated, use |
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188 * SSH_ASKPASS instead. Comment out this var to remove this functionality.*/ |
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189 #define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD" |
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190 |
173
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191 /* Define this (as well as ENABLE_CLI_PASSWORD_AUTH) to allow the use of |
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192 * a helper program for the ssh client. The helper program should be |
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193 * specified in the SSH_ASKPASS environment variable, and dbclient |
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194 * should be run with DISPLAY set and no tty. The program should |
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195 * return the password on standard output */ |
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196 /*#define ENABLE_CLI_ASKPASS_HELPER*/ |
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197 |
149
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198 /* Random device to use - define either DROPBEAR_RANDOM_DEV or |
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199 * DROPBEAR_PRNGD_SOCKET. |
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200 * DROPBEAR_RANDOM_DEV is recommended on hosts with a good /dev/(u)random, |
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201 * otherwise use run prngd (or egd if you want), specifying the socket. |
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202 * The device will be queried for a few dozen bytes of seed a couple of times |
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203 * per session (or more for very long-lived sessions). */ |
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204 |
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205 /* We'll use /dev/urandom by default, since /dev/random is too much hassle. |
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206 * If system developers aren't keeping seeds between boots nor getting |
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207 * any entropy from somewhere it's their own fault. */ |
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208 #define DROPBEAR_RANDOM_DEV "/dev/urandom" |
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209 |
149
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210 /* prngd must be manually set up to produce output */ |
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211 /*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/ |
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212 |
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213 /* Specify the number of clients we will allow to be connected but |
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214 * not yet authenticated. After this limit, connections are rejected */ |
277
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215 /* The first setting is per-IP, to avoid denial of service */ |
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216 #ifndef MAX_UNAUTH_PER_IP |
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217 #define MAX_UNAUTH_PER_IP 5 |
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218 #endif |
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219 |
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220 /* And then a global limit to avoid chewing memory if connections |
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221 * come from many IPs */ |
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222 #ifndef MAX_UNAUTH_CLIENTS |
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223 #define MAX_UNAUTH_CLIENTS 30 |
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224 #endif |
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225 |
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226 /* Maximum number of failed authentication tries (server option) */ |
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227 #ifndef MAX_AUTH_TRIES |
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228 #define MAX_AUTH_TRIES 10 |
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229 #endif |
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230 |
437 | 231 /* The default file to store the daemon's process ID, for shutdown |
232 scripts etc. This can be overridden with the -P flag */ | |
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233 #ifndef DROPBEAR_PIDFILE |
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234 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid" |
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235 #endif |
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236 |
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237 /* The command to invoke for xauth when using X11 forwarding. |
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238 * "-q" for quiet */ |
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239 #ifndef XAUTH_COMMAND |
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240 #define XAUTH_COMMAND "/usr/X11R6/bin/xauth -q" |
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241 #endif |
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242 |
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243 /* if you want to enable running an sftp server (such as the one included with |
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244 * OpenSSH), set the path below. If the path isn't defined, sftp will not |
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245 * be enabled */ |
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246 #ifndef SFTPSERVER_PATH |
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247 #define SFTPSERVER_PATH "/usr/libexec/sftp-server" |
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248 #endif |
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249 |
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250 /* This is used by the scp binary when used as a client binary. If you're |
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251 * not using the Dropbear client, you'll need to change it */ |
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252 #define _PATH_SSH_PROGRAM "/usr/bin/dbclient" |
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253 |
349
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254 /* Whether to log commands executed by a client. This only logs the |
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255 * (single) command sent to the server, not what a user did in a |
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256 * shell/sftp session etc. */ |
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257 /* #define LOG_COMMANDS */ |
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258 |
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259 /* Window size limits. These tend to be a trade-off between memory |
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260 usage and network performance: */ |
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261 /* Size of the network receive window. This amount of memory is allocated |
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262 as a per-channel receive buffer. Increasing this value can make a |
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263 significant difference to network performance. 24kB was empirically |
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264 chosen for a 100mbit ethernet network. The value can be altered at |
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265 runtime with the -W argument. */ |
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266 #define DEFAULT_RECV_WINDOW 24576 |
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267 /* Maximum size of a received SSH data packet - this _MUST_ be >= 32768 |
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268 in order to interoperate with other implementations */ |
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269 #define RECV_MAX_PAYLOAD_LEN 32768 |
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270 /* Maximum size of a transmitted data packet - this can be any value, |
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271 though increasing it may not make a significant difference. */ |
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272 #define TRANS_MAX_PAYLOAD_LEN 16384 |
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273 |
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274 /* Ensure that data is transmitted every KEEPALIVE seconds. This can |
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275 be overridden at runtime with -K. 0 disables keepalives */ |
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276 #define DEFAULT_KEEPALIVE 0 |
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277 |
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278 /* The default path. This will often get replaced by the shell */ |
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279 #define DEFAULT_PATH "/usr/bin:/bin" |
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280 |
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281 /* Some other defines (that mostly should be left alone) are defined |
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282 * in sysoptions.h */ |
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283 #include "sysoptions.h" |
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284 |
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285 #endif /* _OPTIONS_H_ */ |