Mercurial > dropbear

annotate default_options.h.in @ 1296:6959c88c8f13

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author Matt Johnston <matt@ucc.asn.au>
date Wed, 04 May 2016 15:28:33 +0200
parents 750ec4ec4cbe
children 4f8eb331174f
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1295
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1 #ifndef DROPBEAR_DEFAULT_OPTIONS_H_
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2 #define DROPBEAR_DEFAULT_OPTIONS_H_
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3 /*
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4 > > > Read This < < <
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5
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6 default_options.h.in (this file) documents compile-time options, and provides
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7 default values.
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8
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9 Local customisation should be added to localoptions.h which is
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10 used if it exists. Options defined there will override any options in this
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11 file (#ifndef guards added by ifndef_wrapper.sh).
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12
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13 Options can also be defined with -DDROPBEAR_XXX Makefile CFLAGS
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14
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15 IMPORTANT: Many options will require "make clean" after changes */
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16
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17 #define DROPBEAR_DEFPORT "22"
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18
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19 /* Listen on all interfaces */
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20 #define DROPBEAR_DEFADDRESS ""
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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 #define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
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24 #define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
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25 #define ECDSA_PRIV_FILENAME "/etc/dropbear/dropbear_ecdsa_host_key"
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26
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27 /* Set NON_INETD_MODE if you require daemon functionality (ie Dropbear listens
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28 * on chosen ports and keeps accepting connections. This is the default.
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29 *
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30 * Set INETD_MODE if you want to be able to run Dropbear with inetd (or
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31 * similar), where it will use stdin/stdout for connections, and each process
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32 * lasts for a single connection. Dropbear should be invoked with the -i flag
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33 * for inetd, and can only accept IPv4 connections.
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34 *
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35 * Both of these flags can be defined at once, don't compile without at least
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36 * one of them. */
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37 #define NON_INETD_MODE 1
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38 #define INETD_MODE 1
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39
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40 /* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is
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41 * perhaps 20% slower for pubkey operations (it is probably worth experimenting
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42 * if you want to use this) */
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43 /*#define NO_FAST_EXPTMOD*/
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44
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45 /* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save
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46 several kB in binary size however will make the symmetrical ciphers and hashes
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47 slower, perhaps by 50%. Recommended for small systems that aren't doing
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48 much traffic. */
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49 #define DROPBEAR_SMALL_CODE 1
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50
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51 /* Enable X11 Forwarding - server only */
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52 #define DROPBEAR_X11FWD 1
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53
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54 /* Enable TCP Fowarding */
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55 /* 'Local' is "-L" style (client listening port forwarded via server)
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56 * 'Remote' is "-R" style (server listening port forwarded via client) */
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57
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58 #define DROPBEAR_CLI_LOCALTCPFWD 1
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59 #define DROPBEAR_CLI_REMOTETCPFWD 1
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60
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61 #define DROPBEAR_SVR_LOCALTCPFWD 1
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62 #define DROPBEAR_SVR_REMOTETCPFWD 1
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63
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64 /* Enable Authentication Agent Forwarding */
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65 #define DROPBEAR_SVR_AGENTFWD 1
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66 #define DROPBEAR_CLI_AGENTFWD 1
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67
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68
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69 /* Note: Both DROPBEAR_CLI_PROXYCMD and DROPBEAR_CLI_NETCAT must be set to
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70 * allow multihop dbclient connections */
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71
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72 /* Allow using -J <proxycommand> to run the connection through a
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73 pipe to a program, rather the normal TCP connection */
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74 #define DROPBEAR_CLI_PROXYCMD 1
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75
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76 /* Enable "Netcat mode" option. This will forward standard input/output
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77 * to a remote TCP-forwarded connection */
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78 #define DROPBEAR_CLI_NETCAT 1
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79
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80 /* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */
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81 #define ENABLE_USER_ALGO_LIST 1
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82
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83 /* Encryption - at least one required.
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84 * Protocol RFC requires 3DES and recommends AES128 for interoperability.
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85 * Including multiple keysize variants the same cipher
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86 * (eg AES256 as well as AES128) will result in a minimal size increase.*/
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87 #define DROPBEAR_AES128 1
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88 #define DROPBEAR_3DES 1
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89 #define DROPBEAR_AES256 1
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90 /* Compiling in Blowfish will add ~6kB to runtime heap memory usage */
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91 /*#define DROPBEAR_BLOWFISH*/
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92 #define DROPBEAR_TWOFISH256 1
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93 #define DROPBEAR_TWOFISH128 1
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94
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95 /* Enable CBC mode for ciphers. This has security issues though
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96 * is the most compatible with older SSH implementations */
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97 #define DROPBEAR_ENABLE_CBC_MODE 1
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98
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99 /* Enable "Counter Mode" for ciphers. This is more secure than normal
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100 * CBC mode against certain attacks. It is recommended for security
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101 * and forwards compatibility */
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102 #define DROPBEAR_ENABLE_CTR_MODE 1
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103
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104 /* Twofish counter mode is disabled by default because it
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105 has not been tested for interoperability with other SSH implementations.
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106 If you test it please contact the Dropbear author */
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107 #define DROPBEAR_TWOFISH_CTR 0
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108
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109 /* Message integrity. sha2-256 is recommended as a default,
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110 sha1 for compatibility */
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111 #define DROPBEAR_SHA1_HMAC 1
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112 #define DROPBEAR_SHA1_96_HMAC 1
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113 #define DROPBEAR_SHA2_256_HMAC 1
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114 /* Default is to include it is sha512 is being compiled in for ECDSA */
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115 #define DROPBEAR_SHA2_512_HMAC (DROPBEAR_ECDSA)
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116
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117 /* XXX needed for fingerprints */
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118 #define DROPBEAR_MD5_HMAC 0
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119
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120 /* Hostkey/public key algorithms - at least one required, these are used
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121 * for hostkey as well as for verifying signatures with pubkey auth.
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122 * Removing either of these won't save very much space.
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123 * RSA is recommended
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124 * DSS may be necessary to connect to some systems though
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125 is not recommended for new keys */
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126 #define DROPBEAR_RSA 1
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127 #define DROPBEAR_DSS 1
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128 /* ECDSA is significantly faster than RSA or DSS. Compiling in ECC
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129 * code (either ECDSA or ECDH) increases binary size - around 30kB
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130 * on x86-64 */
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131 #define DROPBEAR_ECDSA 1
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132
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133 /* Add runtime flag "-R" to generate hostkeys as-needed when the first
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134 connection using that key type occurs.
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135 This avoids the need to otherwise run "dropbearkey" and avoids some problems
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136 with badly seeded /dev/urandom when systems first boot. */
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137 #define DROPBEAR_DELAY_HOSTKEY 1
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138
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139 /* Enable Curve25519 for key exchange. This is another elliptic
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140 * curve method with good security properties. Increases binary size
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141 * by ~8kB on x86-64 */
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142 #define DROPBEAR_CURVE25519 1
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143
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144 /* Enable elliptic curve Diffie Hellman key exchange, see note about
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145 * ECDSA above */
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146 #define DROPBEAR_ECDH 1
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147
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148 /* Key exchange algorithm.
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149 * group14_sha1 - 2048 bit, sha1
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150 * group14_sha256 - 2048 bit, sha2-256
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151 * group16 - 4096 bit, sha2-512
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152 * group1 - 1024 bit, sha1
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153 *
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154 * group14 is supported by most implementations.
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155 * group16 provides a greater strength level but is slower and increases binary size
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156 * group1 is too small for security though is necessary if you need
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157 compatibility with some implementations such as Dropbear versions < 0.53
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158 */
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159 #define DROPBEAR_DH_GROUP1 1
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160 #define DROPBEAR_DH_GROUP14_SHA1 1
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161 #define DROPBEAR_DH_GROUP14_SHA256 1
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162 #define DROPBEAR_DH_GROUP16 0
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163
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164 /* Control the memory/performance/compression tradeoff for zlib.
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165 * Set windowBits=8 for least memory usage, see your system's
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166 * zlib.h for full details.
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167 * Default settings (windowBits=15) will use 256kB for compression
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168 * windowBits=8 will use 129kB for compression.
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169 * Both modes will use ~35kB for decompression (using windowBits=15 for
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170 * interoperability) */
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171 #define DROPBEAR_ZLIB_WINDOW_BITS 15
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172
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173 /* Whether to do reverse DNS lookups. */
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174 #define DO_HOST_LOOKUP 0
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175
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176 /* Whether to print the message of the day (MOTD). */
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177 #define DO_MOTD 0
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178
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179 /* The MOTD file path */
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180 #define MOTD_FILENAME "/etc/motd"
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181
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182 /* Authentication Types - at least one required.
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183 RFC Draft requires pubkey auth, and recommends password */
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184
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185 /* Note: PAM auth is quite simple and only works for PAM modules which just do
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186 * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
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187 * It's useful for systems like OS X where standard password crypts don't work
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188 * but there's an interface via a PAM module. It won't work for more complex
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189 * PAM challenge/response.
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190 * You can't enable both PASSWORD and PAM. */
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191
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192 /* This requires crypt() */
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193 #ifdef HAVE_CRYPT
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194 #define DROPBEAR_SVR_PASSWORD_AUTH 1
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195 #else
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196 #define DROPBEAR_SVR_PASSWORD_AUTH 0
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197 #endif
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198 /* PAM requires ./configure --enable-pam */
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199 #define DROPBEAR_SVR_PAM_AUTH 0
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200 #define DROPBEAR_SVR_PUBKEY_AUTH 1
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201
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202 /* Whether to take public key options in
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203 * authorized_keys file into account */
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204 #define DROPBEAR_SVR_PUBKEY_OPTIONS 1
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205
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206 /* This requires getpass. */
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207 #ifdef HAVE_GETPASS
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208 #define DROPBEAR_CLI_PASSWORD_AUTH 1
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209 #define DROPBEAR_CLI_INTERACT_AUTH 1
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210 #endif
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211 #define DROPBEAR_CLI_PUBKEY_AUTH 1
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212
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213 /* A default argument for dbclient -i <privatekey>.
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214 Homedir is prepended unless path begins with / */
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215 #define DROPBEAR_DEFAULT_CLI_AUTHKEY ".ssh/id_dropbear"
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216
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217 /* This variable can be used to set a password for client
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218 * authentication on the commandline. Beware of platforms
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219 * that don't protect environment variables of processes etc. Also
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220 * note that it will be provided for all "hidden" client-interactive
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221 * style prompts - if you want something more sophisticated, use
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222 * SSH_ASKPASS instead. Comment out this var to remove this functionality.*/
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223 #define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
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224
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225 /* Define this (as well as DROPBEAR_CLI_PASSWORD_AUTH) to allow the use of
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226 * a helper program for the ssh client. The helper program should be
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227 * specified in the SSH_ASKPASS environment variable, and dbclient
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228 * should be run with DISPLAY set and no tty. The program should
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229 * return the password on standard output */
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230 #define DROPBEAR_CLI_ASKPASS_HELPER 0
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231
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232 /* Save a network roundtrip by sendng a real auth request immediately after
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233 * sending a query for the available methods. It is at the expense of < 100
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234 * bytes of extra network traffic. This is not yet enabled by default since it
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235 * could cause problems with non-compliant servers */
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236 #define DROPBEAR_CLI_IMMEDIATE_AUTH 0
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237
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238 /* Source for randomness. This must be able to provide hundreds of bytes per SSH
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239 * connection without blocking. In addition /dev/random is used for seeding
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240 * rsa/dss key generation */
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241 #define DROPBEAR_URANDOM_DEV "/dev/urandom"
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242
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243 /* Set this to use PRNGD or EGD instead of /dev/urandom or /dev/random */
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244 /*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/
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245
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246
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247 /* Specify the number of clients we will allow to be connected but
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248 * not yet authenticated. After this limit, connections are rejected */
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249 /* The first setting is per-IP, to avoid denial of service */
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250 #define MAX_UNAUTH_PER_IP 5
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251
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252 /* And then a global limit to avoid chewing memory if connections
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253 * come from many IPs */
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254 #define MAX_UNAUTH_CLIENTS 30
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255
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256 /* Maximum number of failed authentication tries (server option) */
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257 #define MAX_AUTH_TRIES 10
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258
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259 /* The default file to store the daemon's process ID, for shutdown
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260 scripts etc. This can be overridden with the -P flag */
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261 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
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262
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263 /* The command to invoke for xauth when using X11 forwarding.
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264 * "-q" for quiet */
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265 #define XAUTH_COMMAND "/usr/bin/xauth -q"
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266
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267 /* if you want to enable running an sftp server (such as the one included with
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268 * OpenSSH), set the path below. If the path isn't defined, sftp will not
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269 * be enabled */
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270 #define SFTPSERVER_PATH "/usr/libexec/sftp-server"
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271
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272 /* This is used by the scp binary when used as a client binary. If you're
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273 * not using the Dropbear client, you'll need to change it */
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274 #define DROPBEAR_PATH_SSH_PROGRAM "/usr/bin/dbclient"
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275
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276 /* Whether to log commands executed by a client. This only logs the
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277 * (single) command sent to the server, not what a user did in a
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278 * shell/sftp session etc. */
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279 #define LOG_COMMANDS 0
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280
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281 /* Window size limits. These tend to be a trade-off between memory
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282 usage and network performance: */
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283 /* Size of the network receive window. This amount of memory is allocated
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284 as a per-channel receive buffer. Increasing this value can make a
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285 significant difference to network performance. 24kB was empirically
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286 chosen for a 100mbit ethernet network. The value can be altered at
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287 runtime with the -W argument. */
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288 #define DEFAULT_RECV_WINDOW 24576
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289 /* Maximum size of a received SSH data packet - this _MUST_ be >= 32768
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290 in order to interoperate with other implementations */
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291 #define RECV_MAX_PAYLOAD_LEN 32768
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292 /* Maximum size of a transmitted data packet - this can be any value,
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293 though increasing it may not make a significant difference. */
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294 #define TRANS_MAX_PAYLOAD_LEN 16384
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295
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296 /* Ensure that data is transmitted every KEEPALIVE seconds. This can
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297 be overridden at runtime with -K. 0 disables keepalives */
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298 #define DEFAULT_KEEPALIVE 0
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299
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300 /* If this many KEEPALIVES are sent with no packets received from the
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301 other side, exit. Not run-time configurable - if you have a need
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302 for runtime configuration please mail the Dropbear list */
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303 #define DEFAULT_KEEPALIVE_LIMIT 3
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304
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305 /* Ensure that data is received within IDLE_TIMEOUT seconds. This can
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306 be overridden at runtime with -I. 0 disables idle timeouts */
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307 #define DEFAULT_IDLE_TIMEOUT 0
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308
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309 /* The default path. This will often get replaced by the shell */
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310 #define DEFAULT_PATH "/usr/bin:/bin"
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311
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312 #endif /* DROPBEAR_DEFAULT_OPTIONS_H_ */