annotate default_options.h @ 1714:c0f12eaf95c9

Disable by default 3des, cbc, hmac-sha1-96, x11 forwarding
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jun 2020 00:09:15 +0800
parents c2c0f43ff827
children d529a52b2f7c 42745af83b7d
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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 in the build directory. Options defined there will override
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10 any options in this 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 #define ED25519_PRIV_FILENAME "/etc/dropbear/dropbear_ed25519_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 /* Include verbose debug output, enabled with -v at runtime.
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41 * This will add a reasonable amount to your executable size. */
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42 #define DEBUG_TRACE 0
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43
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44 /* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save
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45 * several kB in binary size however will make the symmetrical ciphers and hashes
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46 * slower, perhaps by 50%. Recommended for small systems that aren't doing
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47 * much traffic. */
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48 #define DROPBEAR_SMALL_CODE 1
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49
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50 /* Enable X11 Forwarding - server only */
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51 #define DROPBEAR_X11FWD 0
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52
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53 /* Enable TCP Fowarding */
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54 /* 'Local' is "-L" style (client listening port forwarded via server)
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55 * 'Remote' is "-R" style (server listening port forwarded via client) */
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56 #define DROPBEAR_CLI_LOCALTCPFWD 1
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57 #define DROPBEAR_CLI_REMOTETCPFWD 1
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58
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59 #define DROPBEAR_SVR_LOCALTCPFWD 1
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60 #define DROPBEAR_SVR_REMOTETCPFWD 1
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61
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62 /* Enable Authentication Agent Forwarding */
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63 #define DROPBEAR_SVR_AGENTFWD 1
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64 #define DROPBEAR_CLI_AGENTFWD 1
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65
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66 /* Note: Both DROPBEAR_CLI_PROXYCMD and DROPBEAR_CLI_NETCAT must be set to
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67 * allow multihop dbclient connections */
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68
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69 /* Allow using -J <proxycommand> to run the connection through a
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70 pipe to a program, rather the normal TCP connection */
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71 #define DROPBEAR_CLI_PROXYCMD 1
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72
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73 /* Enable "Netcat mode" option. This will forward standard input/output
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74 * to a remote TCP-forwarded connection */
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75 #define DROPBEAR_CLI_NETCAT 1
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76
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77 /* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */
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78 #define DROPBEAR_USER_ALGO_LIST 1
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79
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80 /* Encryption - at least one required.
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81 * AES128 should be enabled, some very old implementations might only
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82 * support 3DES.
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83 * Including both AES keysize variants (128 and 256) will result in
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84 * a minimal size increase */
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85 #define DROPBEAR_AES128 1
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86 #define DROPBEAR_AES256 1
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87 #define DROPBEAR_3DES 0
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88 #define DROPBEAR_TWOFISH256 0
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89 #define DROPBEAR_TWOFISH128 0
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91 /* Enable Chacha20-Poly1305 authenticated encryption mode. This is
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92 * generally faster than AES256 on CPU w/o dedicated AES instructions,
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93 * having the same key size. Recommended.
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94 * Compiling in will add ~5,5kB to binary size on x86-64 */
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95 #define DROPBEAR_CHACHA20POLY1305 1
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96
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97 /* Enable "Counter Mode" for ciphers. Recommended. */
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98 #define DROPBEAR_ENABLE_CTR_MODE 1
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99
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100 /* Enable CBC mode for ciphers. This has security issues though
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101 may be required for compatibility with old implementations */
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102 #define DROPBEAR_ENABLE_CBC_MODE 0
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103
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104 /* Enable "Galois/Counter Mode" for ciphers. This authenticated
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105 * encryption mode is combination of CTR mode and GHASH. Recommended
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106 * for security and forwards compatibility, but slower than CTR on
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107 * CPU w/o dedicated AES/GHASH instructions.
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108 * Compiling in will add ~6kB to binary size on x86-64 */
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109 #define DROPBEAR_ENABLE_GCM_MODE 0
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110
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111 /* Message integrity. sha2-256 is recommended as a default,
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112 sha1 for compatibility */
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113 #define DROPBEAR_SHA1_HMAC 1
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114 #define DROPBEAR_SHA2_256_HMAC 1
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115 #define DROPBEAR_SHA1_96_HMAC 0
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116
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117 /* Hostkey/public key algorithms - at least one required, these are used
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118 * for hostkey as well as for verifying signatures with pubkey auth.
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119 * Removing either of these won't save very much space.
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120 * RSA is recommended
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121 * DSS may be necessary to connect to some systems though
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122 is not recommended for new keys */
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123 #define DROPBEAR_RSA 1
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124 #define DROPBEAR_DSS 1
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125 /* ECDSA is significantly faster than RSA or DSS. Compiling in ECC
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126 * code (either ECDSA or ECDH) increases binary size - around 30kB
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127 * on x86-64 */
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128 #define DROPBEAR_ECDSA 1
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129 /* Ed25519 is faster than ECDSA. Compiling in Ed25519 code increases
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130 binary size - around 7,5kB on x86-64 */
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131 #define DROPBEAR_ED25519 1
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132
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133 /* RSA must be >=1024 */
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134 #define DROPBEAR_DEFAULT_RSA_SIZE 2048
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135 /* DSS is always 1024 */
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136 /* ECDSA defaults to largest size configured, usually 521 */
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137 /* Ed25519 is always 256 */
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138
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139 /* Add runtime flag "-R" to generate hostkeys as-needed when the first
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140 connection using that key type occurs.
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141 This avoids the need to otherwise run "dropbearkey" and avoids some problems
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142 with badly seeded /dev/urandom when systems first boot. */
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143 #define DROPBEAR_DELAY_HOSTKEY 1
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144
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145
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146 /* Key exchange algorithm.
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147
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148 * group14_sha1 - 2048 bit, sha1
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149 * group14_sha256 - 2048 bit, sha2-256
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150 * group16 - 4096 bit, sha2-512
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151 * group1 - 1024 bit, sha1
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152 * curve25519 - elliptic curve DH
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153 * ecdh - NIST elliptic curve DH (256, 384, 521)
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154 *
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155 * group1 is too small for security though is necessary if you need
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156 compatibility with some implementations such as Dropbear versions < 0.53
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157 * group14 is supported by most implementations.
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158 * group16 provides a greater strength level but is slower and increases binary size
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159 * curve25519 and ecdh algorithms are faster than non-elliptic curve methods
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160 * curve25519 increases binary size by ~2,5kB on x86-64
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161 * including either ECDH or ECDSA increases binary size by ~30kB on x86-64
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162
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163 * Small systems should generally include either curve25519 or ecdh for performance.
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164 * curve25519 is less widely supported but is faster
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165 */
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166 #define DROPBEAR_DH_GROUP14_SHA1 1
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167 #define DROPBEAR_DH_GROUP14_SHA256 1
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168 #define DROPBEAR_DH_GROUP16 0
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169 #define DROPBEAR_CURVE25519 1
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170 #define DROPBEAR_ECDH 1
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171 #define DROPBEAR_DH_GROUP1 1
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172
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173 /* When group1 is enabled it will only be allowed by Dropbear client
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174 not as a server, due to concerns over its strength. Set to 0 to allow
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175 group1 in Dropbear server too */
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176 #define DROPBEAR_DH_GROUP1_CLIENTONLY 1
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177
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178 /* Control the memory/performance/compression tradeoff for zlib.
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179 * Set windowBits=8 for least memory usage, see your system's
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180 * zlib.h for full details.
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181 * Default settings (windowBits=15) will use 256kB for compression
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182 * windowBits=8 will use 129kB for compression.
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183 * Both modes will use ~35kB for decompression (using windowBits=15 for
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184 * interoperability) */
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185 #define DROPBEAR_ZLIB_WINDOW_BITS 15
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186
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187 /* Whether to do reverse DNS lookups. */
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188 #define DO_HOST_LOOKUP 0
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189
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190 /* Whether to print the message of the day (MOTD). */
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191 #define DO_MOTD 1
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192 #define MOTD_FILENAME "/etc/motd"
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193
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194 /* Authentication Types - at least one required.
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195 RFC Draft requires pubkey auth, and recommends password */
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196 #define DROPBEAR_SVR_PASSWORD_AUTH 1
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197
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198 /* Note: PAM auth is quite simple and only works for PAM modules which just do
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199 * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
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200 * It's useful for systems like OS X where standard password crypts don't work
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201 * but there's an interface via a PAM module. It won't work for more complex
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202 * PAM challenge/response.
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203 * You can't enable both PASSWORD and PAM. */
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204 #define DROPBEAR_SVR_PAM_AUTH 0
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205
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206 /* ~/.ssh/authorized_keys authentication */
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207 #define DROPBEAR_SVR_PUBKEY_AUTH 1
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208
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209 /* Whether to take public key options in
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210 * authorized_keys file into account */
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211 #define DROPBEAR_SVR_PUBKEY_OPTIONS 1
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212
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213 /* Set this to 0 if your system does not have multiple user support.
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214 (Linux kernel CONFIG_MULTIUSER option)
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215 The resulting binary will not run on a normal system. */
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216 #define DROPBEAR_SVR_MULTIUSER 1
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217
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218 /* Client authentication options */
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219 #define DROPBEAR_CLI_PASSWORD_AUTH 1
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220 #define DROPBEAR_CLI_PUBKEY_AUTH 1
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221
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222 /* A default argument for dbclient -i <privatekey>.
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223 Homedir is prepended unless path begins with / */
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224 #define DROPBEAR_DEFAULT_CLI_AUTHKEY ".ssh/id_dropbear"
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225
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226 /* Allow specifying the password for dbclient via the DROPBEAR_PASSWORD
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227 * environment variable. */
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228 #define DROPBEAR_USE_PASSWORD_ENV 1
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229
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230 /* Define this (as well as DROPBEAR_CLI_PASSWORD_AUTH) to allow the use of
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231 * a helper program for the ssh client. The helper program should be
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232 * specified in the SSH_ASKPASS environment variable, and dbclient
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233 * should be run with DISPLAY set and no tty. The program should
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234 * return the password on standard output */
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235 #define DROPBEAR_CLI_ASKPASS_HELPER 0
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236
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237 /* Save a network roundtrip by sendng a real auth request immediately after
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238 * sending a query for the available methods. This is not yet enabled by default
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239 since it could cause problems with non-compliant servers */
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240 #define DROPBEAR_CLI_IMMEDIATE_AUTH 0
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241
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242 /* Set this to use PRNGD or EGD instead of /dev/urandom */
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243 #define DROPBEAR_USE_PRNGD 0
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244 #define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"
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245
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246 /* Specify the number of clients we will allow to be connected but
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247 * not yet authenticated. After this limit, connections are rejected */
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248 /* The first setting is per-IP, to avoid denial of service */
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249 #define MAX_UNAUTH_PER_IP 5
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250
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251 /* And then a global limit to avoid chewing memory if connections
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252 * come from many IPs */
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253 #define MAX_UNAUTH_CLIENTS 30
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254
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255 /* Default maximum number of failed authentication tries (server option) */
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256 /* -T server option overrides */
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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
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268 /* if you want to enable running an sftp server (such as the one included with
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269 * OpenSSH), set the path below and set DROPBEAR_SFTPSERVER.
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270 * The sftp-server program is not provided by Dropbear itself */
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271 #define DROPBEAR_SFTPSERVER 1
1295
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272 #define SFTPSERVER_PATH "/usr/libexec/sftp-server"
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273
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274 /* This is used by the scp binary when used as a client binary. If you're
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275 * not using the Dropbear client, you'll need to change it */
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276 #define DROPBEAR_PATH_SSH_PROGRAM "/usr/bin/dbclient"
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277
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278 /* Whether to log commands executed by a client. This only logs the
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279 * (single) command sent to the server, not what a user did in a
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280 * shell/sftp session etc. */
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281 #define LOG_COMMANDS 0
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282
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283 /* Window size limits. These tend to be a trade-off between memory
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284 usage and network performance: */
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285 /* Size of the network receive window. This amount of memory is allocated
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286 as a per-channel receive buffer. Increasing this value can make a
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287 significant difference to network performance. 24kB was empirically
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288 chosen for a 100mbit ethernet network. The value can be altered at
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289 runtime with the -W argument. */
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290 #define DEFAULT_RECV_WINDOW 24576
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291 /* Maximum size of a received SSH data packet - this _MUST_ be >= 32768
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292 in order to interoperate with other implementations */
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293 #define RECV_MAX_PAYLOAD_LEN 32768
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294 /* Maximum size of a transmitted data packet - this can be any value,
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295 though increasing it may not make a significant difference. */
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296 #define TRANS_MAX_PAYLOAD_LEN 16384
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297
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298 /* Ensure that data is transmitted every KEEPALIVE seconds. This can
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299 be overridden at runtime with -K. 0 disables keepalives */
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300 #define DEFAULT_KEEPALIVE 0
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301
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302 /* If this many KEEPALIVES are sent with no packets received from the
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303 other side, exit. Not run-time configurable - if you have a need
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304 for runtime configuration please mail the Dropbear list */
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305 #define DEFAULT_KEEPALIVE_LIMIT 3
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306
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307 /* Ensure that data is received within IDLE_TIMEOUT seconds. This can
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308 be overridden at runtime with -I. 0 disables idle timeouts */
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309 #define DEFAULT_IDLE_TIMEOUT 0
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310
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311 /* The default path. This will often get replaced by the shell */
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312 #define DEFAULT_PATH "/usr/bin:/bin"
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313
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314 #endif /* DROPBEAR_DEFAULT_OPTIONS_H_ */