Mercurial > dropbear
annotate options.h @ 342:3e098639b05f
From Erik Hovland
- Check for valid cipher independently to starting encryption
- Use failure-checking m_mp_init for initialising mpint value
| author | Matt Johnston <matt@ucc.asn.au> |
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| date | Fri, 07 Jul 2006 09:28:32 +0000 |
| parents | bfa09e369e0e |
| children | 381834084475 01e4180895ba |
| 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 /* Default hostkey paths - these can be specified on the command line */ |
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18 #ifndef DSS_PRIV_FILENAME |
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19 #define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key" |
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20 #endif |
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21 #ifndef RSA_PRIV_FILENAME |
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22 #define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key" |
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23 #endif |
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24 |
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25 /* Set NON_INETD_MODE if you require daemon functionality (ie Dropbear listens |
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26 * on chosen ports and keeps accepting connections. This is the default. |
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27 * |
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28 * Set INETD_MODE if you want to be able to run Dropbear with inetd (or |
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29 * similar), where it will use stdin/stdout for connections, and each process |
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30 * lasts for a single connection. Dropbear should be invoked with the -i flag |
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31 * for inetd, and can only accept IPv4 connections. |
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32 * |
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33 * Both of these flags can be defined at once, don't compile without at least |
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34 * one of them. */ |
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35 #define NON_INETD_MODE |
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36 #define INETD_MODE |
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37 |
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38 /* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is |
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39 * perhaps 20% slower for pubkey operations (it is probably worth experimenting |
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40 * if you want to use this) */ |
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41 /*#define NO_FAST_EXPTMOD*/ |
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42 |
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43 /* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save |
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44 several kB in binary size, however will make the symmetrical ciphers (AES, DES |
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45 etc) slower (perhaps by 50%). Recommended for most small systems. */ |
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46 #define DROPBEAR_SMALL_CODE |
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47 |
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48 /* Enable X11 Forwarding - server only */ |
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49 #define ENABLE_X11FWD |
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50 |
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51 /* Enable TCP Fowarding */ |
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52 /* 'Local' is "-L" style (client listening port forwarded via server) |
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53 * 'Remote' is "-R" style (server listening port forwarded via client) */ |
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54 |
| 64 | 55 #define ENABLE_CLI_LOCALTCPFWD |
| 56 #define ENABLE_CLI_REMOTETCPFWD | |
| 57 | |
| 58 #define ENABLE_SVR_LOCALTCPFWD | |
| 59 #define ENABLE_SVR_REMOTETCPFWD | |
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60 |
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61 /* Enable Authentication Agent Forwarding - server only for now */ |
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62 #define ENABLE_AGENTFWD |
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63 |
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64 /* Encryption - at least one required. |
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65 * RFC Draft requires 3DES and recommends AES128 for interoperability. |
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66 * Including multiple keysize variants the same cipher |
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67 * (eg AES256 as well as AES128) will result in a minimal size increase.*/ |
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68 #define DROPBEAR_AES128_CBC |
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69 #define DROPBEAR_3DES_CBC |
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70 #define DROPBEAR_AES256_CBC |
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71 #define DROPBEAR_BLOWFISH_CBC |
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72 #define DROPBEAR_TWOFISH256_CBC |
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73 #define DROPBEAR_TWOFISH128_CBC |
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74 |
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75 /* Message Integrity - at least one required. |
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76 * RFC Draft requires sha1 and recommends sha1-96. |
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77 * sha1-96 may be of use for slow links, as it has a smaller overhead. |
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78 * |
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79 * Note: there's no point disabling sha1 to save space, since it's used |
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80 * for the random number generator and public-key cryptography anyway. |
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81 * Disabling it here will just stop it from being used as the integrity portion |
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82 * of the ssh protocol. |
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83 * |
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84 * These hashes are also used for public key fingerprints in logs. |
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85 * If you disable MD5, Dropbear will fall back to SHA1 fingerprints, |
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86 * which are not the standard form. */ |
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87 #define DROPBEAR_SHA1_HMAC |
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88 #define DROPBEAR_SHA1_96_HMAC |
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89 #define DROPBEAR_MD5_HMAC |
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90 |
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91 /* Hostkey/public key algorithms - at least one required, these are used |
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92 * for hostkey as well as for verifying signatures with pubkey auth. |
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93 * Removing either of these won't save very much space. |
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94 * SSH2 RFC Draft requires dss, recommends rsa */ |
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95 #define DROPBEAR_RSA |
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96 #define DROPBEAR_DSS |
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97 |
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98 /* RSA can be vulnerable to timing attacks which use the time required for |
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99 * signing to guess the private key. Blinding avoids this attack, though makes |
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100 * signing operations slightly slower. */ |
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101 #define RSA_BLINDING |
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102 |
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103 /* Define DSS_PROTOK to use PuTTY's method of generating the value k for dss, |
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104 * rather than just from the random byte source. Undefining this will save you |
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105 * ~4k in binary size with static uclibc, but your DSS hostkey could be exposed |
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106 * if the random number source isn't good. In general this isn't required */ |
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107 /* #define DSS_PROTOK */ |
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108 |
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109 /* Whether to do reverse DNS lookups. */ |
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110 #define DO_HOST_LOOKUP |
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111 |
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112 /* Whether to print the message of the day (MOTD). This doesn't add much code |
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113 * size */ |
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114 #define DO_MOTD |
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115 |
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116 /* The MOTD file path */ |
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117 #ifndef MOTD_FILENAME |
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118 #define MOTD_FILENAME "/etc/motd" |
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119 #endif |
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120 |
| 121 | 121 /* Authentication Types - at least one required. |
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122 RFC Draft requires pubkey auth, and recommends password */ |
| 121 | 123 |
| 176 | 124 /* Note: PAM auth is quite simple, and only works for PAM modules which just do |
| 125 * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c). | |
| 126 * It's useful for systems like OS X where standard password crypts don't work, | |
| 127 * but there's an interface via a PAM module - don't bother using it otherwise. | |
| 128 * You can't enable both PASSWORD and PAM. */ | |
| 121 | 129 |
| 342 | 130 /*#define ENABLE_SVR_PASSWORD_AUTH*/ |
| 131 #define ENABLE_SVR_PAM_AUTH | |
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132 #define ENABLE_SVR_PUBKEY_AUTH |
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133 |
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134 #define ENABLE_CLI_PASSWORD_AUTH |
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135 #define ENABLE_CLI_PUBKEY_AUTH |
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136 #define ENABLE_CLI_INTERACT_AUTH |
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137 |
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173
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138 /* Define this (as well as ENABLE_CLI_PASSWORD_AUTH) to allow the use of |
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139 * a helper program for the ssh client. The helper program should be |
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140 * specified in the SSH_ASKPASS environment variable, and dbclient |
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141 * should be run with DISPLAY set and no tty. The program should |
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142 * return the password on standard output */ |
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143 /*#define ENABLE_CLI_ASKPASS_HELPER*/ |
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144 |
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145 /* Random device to use - define either DROPBEAR_RANDOM_DEV or |
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146 * DROPBEAR_PRNGD_SOCKET. |
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147 * DROPBEAR_RANDOM_DEV is recommended on hosts with a good /dev/(u)random, |
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148 * otherwise use run prngd (or egd if you want), specifying the socket. |
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149 * The device will be queried for a few dozen bytes of seed a couple of times |
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150 * per session (or more for very long-lived sessions). */ |
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151 |
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152 /* If you are lacking entropy on the system then using /dev/urandom |
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153 * will prevent Dropbear from blocking on the device. This could |
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154 * however significantly reduce the security of your ssh connections |
| 176 | 155 * if the PRNG state becomes guessable - make sure you know what you are |
| 156 * doing if you change this. */ | |
|
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157 #define DROPBEAR_RANDOM_DEV "/dev/random" |
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158 |
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159 /* prngd must be manually set up to produce output */ |
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160 /*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/ |
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161 |
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162 /* Specify the number of clients we will allow to be connected but |
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163 * not yet authenticated. After this limit, connections are rejected */ |
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277
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164 /* The first setting is per-IP, to avoid denial of service */ |
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165 #ifndef MAX_UNAUTH_PER_IP |
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166 #define MAX_UNAUTH_PER_IP 5 |
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167 #endif |
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168 |
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169 /* And then a global limit to avoid chewing memory if connections |
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170 * come from many IPs */ |
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171 #ifndef MAX_UNAUTH_CLIENTS |
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172 #define MAX_UNAUTH_CLIENTS 30 |
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173 #endif |
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174 |
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175 /* Maximum number of failed authentication tries (server option) */ |
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176 #ifndef MAX_AUTH_TRIES |
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177 #define MAX_AUTH_TRIES 10 |
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178 #endif |
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179 |
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180 /* The file to store the daemon's process ID, for shutdown scripts etc */ |
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181 #ifndef DROPBEAR_PIDFILE |
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182 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid" |
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183 #endif |
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184 |
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185 /* The command to invoke for xauth when using X11 forwarding. |
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186 * "-q" for quiet */ |
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187 #ifndef XAUTH_COMMAND |
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188 #define XAUTH_COMMAND "/usr/X11R6/bin/xauth -q" |
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189 #endif |
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190 |
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191 /* if you want to enable running an sftp server (such as the one included with |
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192 * OpenSSH), set the path below. If the path isn't defined, sftp will not |
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193 * be enabled */ |
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194 #ifndef SFTPSERVER_PATH |
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195 #define SFTPSERVER_PATH "/usr/libexec/sftp-server" |
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196 #endif |
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197 |
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198 /* This is used by the scp binary when used as a client binary. If you're |
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199 * not using the Dropbear client, you'll need to change it */ |
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200 #define _PATH_SSH_PROGRAM "/usr/bin/dbclient" |
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201 |
| 33 | 202 /* Multi-purpose binary configuration has now moved. Look at the top |
| 203 * of the Makefile for instructions, or INSTALL */ | |
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204 |
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205 /******************************************************************* |
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206 * You shouldn't edit below here unless you know you need to. |
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207 *******************************************************************/ |
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208 |
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209 #ifndef DROPBEAR_VERSION |
| 337 | 210 #define DROPBEAR_VERSION "0.49" |
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211 #endif |
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212 |
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213 #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION |
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214 #define PROGNAME "dropbear" |
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215 |
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216 /* Spec recommends after one hour or 1 gigabyte of data. One hour |
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217 * is a bit too verbose, so we try 8 hours */ |
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218 #ifndef KEX_REKEY_TIMEOUT |
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219 #define KEX_REKEY_TIMEOUT (3600 * 8) |
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220 #endif |
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221 #ifndef KEX_REKEY_DATA |
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222 #define KEX_REKEY_DATA (1<<30) /* 2^30 == 1GB, this value must be < INT_MAX */ |
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223 #endif |
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224 /* Close connections to clients which haven't authorised after AUTH_TIMEOUT */ |
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225 #ifndef AUTH_TIMEOUT |
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226 #define AUTH_TIMEOUT 300 /* we choose 5 minutes */ |
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227 #endif |
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228 |
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229 /* Minimum key sizes for DSS and RSA */ |
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230 #ifndef MIN_DSS_KEYLEN |
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231 #define MIN_DSS_KEYLEN 512 |
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232 #endif |
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233 #ifndef MIN_RSA_KEYLEN |
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234 #define MIN_RSA_KEYLEN 512 |
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235 #endif |
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236 |
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237 #define MAX_BANNER_SIZE 2000 /* this is 25*80 chars, any more is foolish */ |
| 43 | 238 #define MAX_BANNER_LINES 20 /* How many lines the client will display */ |
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239 |
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240 /* the number of NAME=VALUE pairs to malloc for environ, if we don't have |
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241 * the clearenv() function */ |
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242 #define ENV_SIZE 100 |
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243 |
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244 #define MAX_CMD_LEN 1024 /* max length of a command */ |
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245 #define MAX_TERM_LEN 200 /* max length of TERM name */ |
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246 |
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247 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */ |
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248 #define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */ |
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249 |
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250 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified, |
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251 ipv4 and ipv6 don't count twice */ |
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252 |
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253 /* Each port might have at least a v4 and a v6 address */ |
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254 #define MAX_LISTEN_ADDR (DROPBEAR_MAX_PORTS*3) |
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255 |
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256 #define _PATH_TTY "/dev/tty" |
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257 |
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258 #define _PATH_CP "/bin/cp" |
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259 |
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260 /* Timeouts in seconds */ |
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261 #define SELECT_TIMEOUT 20 |
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262 |
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263 /* success/failure defines */ |
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264 #define DROPBEAR_SUCCESS 0 |
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265 #define DROPBEAR_FAILURE -1 |
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266 |
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267 /* various algorithm identifiers */ |
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268 #define DROPBEAR_KEX_DH_GROUP1 0 |
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269 |
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270 #define DROPBEAR_SIGNKEY_ANY 0 |
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271 #define DROPBEAR_SIGNKEY_RSA 1 |
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272 #define DROPBEAR_SIGNKEY_DSS 2 |
| 44 | 273 #define DROPBEAR_SIGNKEY_NONE 3 |
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274 |
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275 #define DROPBEAR_COMP_NONE 0 |
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276 #define DROPBEAR_COMP_ZLIB 1 |
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277 |
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278 /* Required for pubkey auth */ |
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279 #if defined(ENABLE_SVR_PUBKEY_AUTH) || defined(DROPBEAR_CLIENT) |
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280 #define DROPBEAR_SIGNKEY_VERIFY |
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281 #endif |
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282 |
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283 /* SHA1 is 20 bytes == 160 bits */ |
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284 #define SHA1_HASH_SIZE 20 |
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285 /* SHA512 is 64 bytes == 512 bits */ |
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286 #define SHA512_HASH_SIZE 64 |
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287 /* MD5 is 16 bytes = 128 bits */ |
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288 #define MD5_HASH_SIZE 16 |
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289 |
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290 /* largest of MD5 and SHA1 */ |
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291 #define MAX_MAC_LEN SHA1_HASH_SIZE |
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292 |
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293 |
| 233 | 294 #define MAX_KEY_LEN 32 /* 256 bits for aes256 etc */ |
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295 #define MAX_IV_LEN 20 /* must be same as max blocksize, |
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296 and >= SHA1_HASH_SIZE */ |
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297 #define MAX_MAC_KEY 20 |
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298 |
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299 #define MAX_NAME_LEN 64 /* maximum length of a protocol name, isn't |
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300 explicitly specified for all protocols (just |
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301 for algos) but seems valid */ |
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302 |
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303 #define MAX_PROPOSED_ALGO 20 |
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304 |
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305 /* size/count limits */ |
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306 |
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307 #define MAX_PACKET_LEN 35000 |
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308 #define MIN_PACKET_LEN 16 |
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309 #define MAX_PAYLOAD_LEN 32768 |
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310 |
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311 #define MAX_TRANS_PAYLOAD_LEN 32768 |
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312 #define MAX_TRANS_PACKET_LEN (MAX_TRANS_PAYLOAD_LEN+50) |
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313 |
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314 #define MAX_TRANS_WINDOW 500000000 /* 500MB is sufficient, stopping overflow */ |
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315 #define MAX_TRANS_WIN_INCR 500000000 /* overflow prevention */ |
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316 |
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317 #define MAX_STRING_LEN 1400 /* ~= MAX_PROPOSED_ALGO * MAX_NAME_LEN, also |
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318 is the max length for a password etc */ |
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319 |
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320 /* For a 4096 bit DSS key, empirically determined */ |
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321 #define MAX_PUBKEY_SIZE 1700 |
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322 /* For a 4096 bit DSS key, empirically determined */ |
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323 #define MAX_PRIVKEY_SIZE 1700 |
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324 |
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325 /* The maximum size of the bignum portion of the kexhash buffer */ |
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326 /* Sect. 8 of the transport draft, K_S + e + f + K */ |
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327 #define KEXHASHBUF_MAX_INTS (1700 + 130 + 130 + 130) |
| 47 | 328 |
| 62 | 329 #define DROPBEAR_MAX_SOCKS 2 /* IPv4, IPv6 are all we'll get for now. Revisit |
| 330 in a few years time.... */ | |
| 331 | |
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332 #define DROPBEAR_MAX_CLI_PASS 1024 |
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333 |
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249
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334 #define DROPBEAR_MAX_CLI_INTERACT_PROMPTS 80 /* The number of prompts we'll |
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335 accept for keyb-interactive |
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336 auth */ |
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337 |
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338 #if defined(DROPBEAR_AES256_CBC) || defined(DROPBEAR_AES128_CBC) |
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339 #define DROPBEAR_AES_CBC |
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340 #endif |
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341 |
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342 #if defined(DROPBEAR_TWOFISH256_CBC) || defined(DROPBEAR_TWOFISH128_CBC) |
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343 #define DROPBEAR_TWOFISH_CBC |
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344 #endif |
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345 |
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346 #ifndef ENABLE_X11FWD |
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347 #define DISABLE_X11FWD |
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348 #endif |
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349 |
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350 #ifndef ENABLE_AGENTFWD |
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351 #define DISABLE_AGENTFWD |
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352 #endif |
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353 |
| 64 | 354 #if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD) |
| 355 #define ENABLE_CLI_ANYTCPFWD | |
| 356 #endif | |
| 357 | |
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358 #if defined(ENABLE_CLI_LOCALTCPFWD) || defined(ENABLE_SVR_REMOTETCPFWD) |
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359 #define DROPBEAR_TCP_ACCEPT |
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360 #endif |
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361 |
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362 #if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD) || \ |
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363 defined(ENABLE_SVR_REMOTETCPFWD) || defined(ENABLE_SVR_LOCALTCPFWD) || \ |
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364 defined(ENABLE_AGENTFWD) || defined(ENABLE_X11FWD) |
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365 #define USING_LISTENERS |
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366 #endif |
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367 |
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368 #if defined(DROPBEAR_CLIENT) || defined(ENABLE_SVR_PUBKEY_AUTH) |
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369 #define DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */ |
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370 #endif |
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371 |
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372 #if defined(ENABLE_SVR_PASSWORD_AUTH) && defined(ENABLE_SVR_PAM_AUTH) |
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373 #error "You can't turn on PASSWORD and PAM auth both at once. Fix it in options.h" |
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374 #endif |
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375 |
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376 #if defined(DROPBEAR_RANDOM_DEV) && defined(DROPBEAR_PRNGD_SOCKET) |
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377 #error "You can't turn on DROPBEAR_PRNGD_SOCKET and DROPBEAR_RANDOM_DEV at once" |
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378 #endif |
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379 |
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380 #if !defined(DROPBEAR_RANDOM_DEV) && !defined(DROPBEAR_PRNGD_SOCKET) |
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381 #error "You must choose one of DROPBEAR_PRNGD_SOCKET or DROPBEAR_RANDOM_DEV in options.h" |
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382 #endif |
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383 |
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384 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant |
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385 * code, if we're just compiling as client or server */ |
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386 #if defined(DROPBEAR_SERVER) && defined(DROPBEAR_CLIENT) |
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387 |
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388 #define IS_DROPBEAR_SERVER (ses.isserver == 1) |
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389 #define IS_DROPBEAR_CLIENT (ses.isserver == 0) |
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390 |
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391 #elif defined(DROPBEAR_SERVER) |
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392 |
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393 #define IS_DROPBEAR_SERVER 1 |
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394 #define IS_DROPBEAR_CLIENT 0 |
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395 |
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396 #elif defined(DROPBEAR_CLIENT) |
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397 |
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398 #define IS_DROPBEAR_SERVER 0 |
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399 #define IS_DROPBEAR_CLIENT 1 |
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400 |
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401 #else |
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402 #error You must compiled with either DROPBEAR_CLIENT or DROPBEAR_SERVER selected |
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403 #endif |
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404 |
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405 #endif /* _OPTIONS_H_ */ |