Mercurial > dropbear
annotate default_options.h @ 1561:02b226c2675e fuzz
clean some fuzzing conditionals
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 28 Feb 2018 22:10:43 +0800 |
parents | bb8eaa26bc93 |
children | 2fd52c383163 |
rev | line source |
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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 documents compile-time options, and provides default values. |
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7 |
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8 Local customisation should be added to localoptions.h which is |
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9 used if it exists. Options defined there will override any options in this |
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10 file. |
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11 |
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12 Options can also be defined with -DDROPBEAR_XXX=[0,1] in Makefile CFLAGS |
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13 |
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14 IMPORTANT: Some options will require "make clean" after changes */ |
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15 |
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16 #define DROPBEAR_DEFPORT "22" |
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17 |
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18 /* Listen on all interfaces */ |
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19 #define DROPBEAR_DEFADDRESS "" |
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20 |
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21 /* Default hostkey paths - these can be specified on the command line */ |
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22 #define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key" |
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23 #define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key" |
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24 #define ECDSA_PRIV_FILENAME "/etc/dropbear/dropbear_ecdsa_host_key" |
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25 |
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26 /* Set NON_INETD_MODE if you require daemon functionality (ie Dropbear listens |
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27 * on chosen ports and keeps accepting connections. This is the default. |
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28 * |
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29 * Set INETD_MODE if you want to be able to run Dropbear with inetd (or |
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30 * similar), where it will use stdin/stdout for connections, and each process |
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31 * lasts for a single connection. Dropbear should be invoked with the -i flag |
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32 * for inetd, and can only accept IPv4 connections. |
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33 * |
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34 * Both of these flags can be defined at once, don't compile without at least |
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35 * one of them. */ |
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36 #define NON_INETD_MODE 1 |
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37 #define INETD_MODE 1 |
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38 |
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39 /* Include verbose debug output, enabled with -v at runtime. |
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40 * This will add a reasonable amount to your executable size. */ |
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41 #define DEBUG_TRACE 0 |
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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 and hashes |
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45 * slower, perhaps by 50%. Recommended for small systems that aren't doing |
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46 * much traffic. */ |
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47 #define DROPBEAR_SMALL_CODE 1 |
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48 |
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49 /* Enable X11 Forwarding - server only */ |
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50 #define DROPBEAR_X11FWD 1 |
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51 |
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52 /* Enable TCP Fowarding */ |
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53 /* 'Local' is "-L" style (client listening port forwarded via server) |
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54 * 'Remote' is "-R" style (server listening port forwarded via client) */ |
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55 #define DROPBEAR_CLI_LOCALTCPFWD 1 |
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56 #define DROPBEAR_CLI_REMOTETCPFWD 1 |
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57 |
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58 #define DROPBEAR_SVR_LOCALTCPFWD 1 |
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59 #define DROPBEAR_SVR_REMOTETCPFWD 1 |
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60 |
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61 /* Enable Authentication Agent Forwarding */ |
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62 #define DROPBEAR_SVR_AGENTFWD 1 |
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63 #define DROPBEAR_CLI_AGENTFWD 1 |
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64 |
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65 /* Note: Both DROPBEAR_CLI_PROXYCMD and DROPBEAR_CLI_NETCAT must be set to |
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66 * allow multihop dbclient connections */ |
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67 |
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68 /* Allow using -J <proxycommand> to run the connection through a |
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69 pipe to a program, rather the normal TCP connection */ |
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70 #define DROPBEAR_CLI_PROXYCMD 1 |
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71 |
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72 /* Enable "Netcat mode" option. This will forward standard input/output |
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73 * to a remote TCP-forwarded connection */ |
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74 #define DROPBEAR_CLI_NETCAT 1 |
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75 |
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76 /* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */ |
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77 #define DROPBEAR_USER_ALGO_LIST 1 |
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78 |
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79 /* Encryption - at least one required. |
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80 * AES128 should be enabled, some very old implementations might only |
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81 * support 3DES. |
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82 * Including both AES keysize variants (128 and 256) will result in |
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83 * a minimal size increase */ |
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84 #define DROPBEAR_AES128 1 |
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85 #define DROPBEAR_3DES 1 |
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86 #define DROPBEAR_AES256 1 |
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87 #define DROPBEAR_TWOFISH256 0 |
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88 #define DROPBEAR_TWOFISH128 0 |
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89 /* Compiling in Blowfish will add ~6kB to runtime heap memory usage */ |
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90 #define DROPBEAR_BLOWFISH 0 |
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91 |
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92 /* Enable CBC mode for ciphers. This has security issues though |
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93 * is the most compatible with older SSH implementations */ |
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94 #define DROPBEAR_ENABLE_CBC_MODE 1 |
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95 |
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96 /* Enable "Counter Mode" for ciphers. This is more secure than |
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97 * CBC mode against certain attacks. It is recommended for security |
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98 * and forwards compatibility */ |
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99 #define DROPBEAR_ENABLE_CTR_MODE 1 |
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100 |
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101 /* Message integrity. sha2-256 is recommended as a default, |
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102 sha1 for compatibility */ |
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103 #define DROPBEAR_SHA1_HMAC 1 |
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104 #define DROPBEAR_SHA1_96_HMAC 1 |
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105 #define DROPBEAR_SHA2_256_HMAC 1 |
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106 |
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107 /* Hostkey/public key algorithms - at least one required, these are used |
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108 * for hostkey as well as for verifying signatures with pubkey auth. |
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109 * Removing either of these won't save very much space. |
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110 * RSA is recommended |
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111 * DSS may be necessary to connect to some systems though |
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112 is not recommended for new keys */ |
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113 #define DROPBEAR_RSA 1 |
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114 #define DROPBEAR_DSS 1 |
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115 /* ECDSA is significantly faster than RSA or DSS. Compiling in ECC |
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116 * code (either ECDSA or ECDH) increases binary size - around 30kB |
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117 * on x86-64 */ |
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118 #define DROPBEAR_ECDSA 1 |
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119 |
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120 /* RSA must be >=1024 */ |
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121 #define DROPBEAR_DEFAULT_RSA_SIZE 2048 |
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122 /* DSS is always 1024 */ |
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123 /* ECDSA defaults to largest size configured, usually 521 */ |
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124 |
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125 /* Add runtime flag "-R" to generate hostkeys as-needed when the first |
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126 connection using that key type occurs. |
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127 This avoids the need to otherwise run "dropbearkey" and avoids some problems |
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128 with badly seeded /dev/urandom when systems first boot. */ |
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129 #define DROPBEAR_DELAY_HOSTKEY 1 |
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130 |
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131 |
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132 /* Key exchange algorithm. |
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133 |
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134 * group14_sha1 - 2048 bit, sha1 |
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135 * group14_sha256 - 2048 bit, sha2-256 |
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136 * group16 - 4096 bit, sha2-512 |
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137 * group1 - 1024 bit, sha1 |
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138 * curve25519 - elliptic curve DH |
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139 * ecdh - NIST elliptic curve DH (256, 384, 521) |
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140 * |
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141 * group1 is too small for security though is necessary if you need |
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142 compatibility with some implementations such as Dropbear versions < 0.53 |
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143 * group14 is supported by most implementations. |
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144 * group16 provides a greater strength level but is slower and increases binary size |
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145 * curve25519 and ecdh algorithms are faster than non-elliptic curve methods |
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146 * curve25519 increases binary size by ~8kB on x86-64 |
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147 * including either ECDH or ECDSA increases binary size by ~30kB on x86-64 |
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148 |
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149 * Small systems should generally include either curve25519 or ecdh for performance. |
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150 * curve25519 is less widely supported but is faster |
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151 */ |
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152 #define DROPBEAR_DH_GROUP14_SHA1 1 |
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153 #define DROPBEAR_DH_GROUP14_SHA256 1 |
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154 #define DROPBEAR_DH_GROUP16 0 |
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155 #define DROPBEAR_CURVE25519 1 |
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156 #define DROPBEAR_ECDH 1 |
1544 | 157 #define DROPBEAR_DH_GROUP1 1 |
158 | |
159 /* When group1 is enabled it will only be allowed by Dropbear client | |
160 not as a server, due to concerns over its strength. Set to 0 to allow | |
161 group1 in Dropbear server too */ | |
162 #define DROPBEAR_DH_GROUP1_CLIENTONLY 1 | |
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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 #define MOTD_FILENAME "/etc/motd" |
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179 |
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180 /* Authentication Types - at least one required. |
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181 RFC Draft requires pubkey auth, and recommends password */ |
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182 #define DROPBEAR_SVR_PASSWORD_AUTH 1 |
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183 |
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184 /* Note: PAM auth is quite simple and only works for PAM modules which just do |
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185 * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c). |
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186 * It's useful for systems like OS X where standard password crypts don't work |
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187 * but there's an interface via a PAM module. It won't work for more complex |
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188 * PAM challenge/response. |
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189 * You can't enable both PASSWORD and PAM. */ |
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190 #define DROPBEAR_SVR_PAM_AUTH 0 |
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191 |
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192 /* ~/.ssh/authorized_keys authentication */ |
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193 #define DROPBEAR_SVR_PUBKEY_AUTH 1 |
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194 |
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195 /* Whether to take public key options in |
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196 * authorized_keys file into account */ |
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197 #define DROPBEAR_SVR_PUBKEY_OPTIONS 1 |
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198 |
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199 /* Client authentication options */ |
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200 #define DROPBEAR_CLI_PASSWORD_AUTH 1 |
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201 #define DROPBEAR_CLI_PUBKEY_AUTH 1 |
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202 |
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203 /* A default argument for dbclient -i <privatekey>. |
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204 Homedir is prepended unless path begins with / */ |
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205 #define DROPBEAR_DEFAULT_CLI_AUTHKEY ".ssh/id_dropbear" |
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206 |
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207 /* Allow specifying the password for dbclient via the DROPBEAR_PASSWORD |
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208 * environment variable. */ |
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209 #define DROPBEAR_USE_PASSWORD_ENV 1 |
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210 |
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211 /* Define this (as well as DROPBEAR_CLI_PASSWORD_AUTH) to allow the use of |
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212 * a helper program for the ssh client. The helper program should be |
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213 * specified in the SSH_ASKPASS environment variable, and dbclient |
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214 * should be run with DISPLAY set and no tty. The program should |
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215 * return the password on standard output */ |
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216 #define DROPBEAR_CLI_ASKPASS_HELPER 0 |
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217 |
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218 /* Save a network roundtrip by sendng a real auth request immediately after |
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219 * sending a query for the available methods. This is not yet enabled by default |
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220 since it could cause problems with non-compliant servers */ |
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221 #define DROPBEAR_CLI_IMMEDIATE_AUTH 0 |
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222 |
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223 /* Set this to use PRNGD or EGD instead of /dev/urandom */ |
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224 #define DROPBEAR_USE_PRNGD 0 |
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225 #define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng" |
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226 |
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227 /* Specify the number of clients we will allow to be connected but |
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228 * not yet authenticated. After this limit, connections are rejected */ |
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229 /* The first setting is per-IP, to avoid denial of service */ |
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230 #define MAX_UNAUTH_PER_IP 5 |
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231 |
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232 /* And then a global limit to avoid chewing memory if connections |
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233 * come from many IPs */ |
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234 #define MAX_UNAUTH_CLIENTS 30 |
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235 |
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236 /* Default maximum number of failed authentication tries (server option) */ |
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237 /* -T server option overrides */ |
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238 #define MAX_AUTH_TRIES 10 |
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239 |
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240 /* The default file to store the daemon's process ID, for shutdown |
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241 scripts etc. This can be overridden with the -P flag */ |
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242 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid" |
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243 |
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244 /* The command to invoke for xauth when using X11 forwarding. |
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245 * "-q" for quiet */ |
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246 #define XAUTH_COMMAND "/usr/bin/xauth -q" |
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247 |
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248 |
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249 /* if you want to enable running an sftp server (such as the one included with |
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250 * OpenSSH), set the path below and set DROPBEAR_SFTPSERVER. |
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251 * The sftp-server program is not provided by Dropbear itself */ |
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252 #define DROPBEAR_SFTPSERVER 1 |
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253 #define SFTPSERVER_PATH "/usr/libexec/sftp-server" |
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254 |
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255 /* This is used by the scp binary when used as a client binary. If you're |
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256 * not using the Dropbear client, you'll need to change it */ |
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257 #define DROPBEAR_PATH_SSH_PROGRAM "/usr/bin/dbclient" |
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258 |
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259 /* Whether to log commands executed by a client. This only logs the |
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260 * (single) command sent to the server, not what a user did in a |
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261 * shell/sftp session etc. */ |
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262 #define LOG_COMMANDS 0 |
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263 |
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264 /* Window size limits. These tend to be a trade-off between memory |
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265 usage and network performance: */ |
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266 /* Size of the network receive window. This amount of memory is allocated |
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267 as a per-channel receive buffer. Increasing this value can make a |
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268 significant difference to network performance. 24kB was empirically |
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269 chosen for a 100mbit ethernet network. The value can be altered at |
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270 runtime with the -W argument. */ |
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271 #define DEFAULT_RECV_WINDOW 24576 |
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272 /* Maximum size of a received SSH data packet - this _MUST_ be >= 32768 |
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273 in order to interoperate with other implementations */ |
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274 #define RECV_MAX_PAYLOAD_LEN 32768 |
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275 /* Maximum size of a transmitted data packet - this can be any value, |
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276 though increasing it may not make a significant difference. */ |
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277 #define TRANS_MAX_PAYLOAD_LEN 16384 |
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278 |
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279 /* Ensure that data is transmitted every KEEPALIVE seconds. This can |
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280 be overridden at runtime with -K. 0 disables keepalives */ |
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281 #define DEFAULT_KEEPALIVE 0 |
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282 |
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283 /* If this many KEEPALIVES are sent with no packets received from the |
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284 other side, exit. Not run-time configurable - if you have a need |
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285 for runtime configuration please mail the Dropbear list */ |
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286 #define DEFAULT_KEEPALIVE_LIMIT 3 |
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287 |
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288 /* Ensure that data is received within IDLE_TIMEOUT seconds. This can |
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289 be overridden at runtime with -I. 0 disables idle timeouts */ |
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290 #define DEFAULT_IDLE_TIMEOUT 0 |
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291 |
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292 /* The default path. This will often get replaced by the shell */ |
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293 #define DEFAULT_PATH "/usr/bin:/bin" |
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294 |
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295 #endif /* DROPBEAR_DEFAULT_OPTIONS_H_ */ |