annotate options.h @ 1340:5c9207ceedae

Added tag DROPBEAR_2017.75 for changeset c31276613181
author Matt Johnston <matt@ucc.asn.au>
date Thu, 18 May 2017 22:58:14 +0800
parents 739b3909c499
children dc8f7997f10f
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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 DROPBEAR_OPTIONS_H_
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6 #define DROPBEAR_OPTIONS_H_
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8 /* Define compile-time options below - the "#ifndef DROPBEAR_XXX .... #endif"
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9 * parts are to allow for commandline -DDROPBEAR_XXX options etc. */
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10
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11 /* IMPORTANT: Many options will require "make clean" after changes */
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12
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13 #ifndef DROPBEAR_DEFPORT
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14 #define DROPBEAR_DEFPORT "22"
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15 #endif
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16
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17 #ifndef DROPBEAR_DEFADDRESS
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18 /* Listen on all interfaces */
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19 #define DROPBEAR_DEFADDRESS ""
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20 #endif
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21
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22 /* Default hostkey paths - these can be specified on the command line */
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23 #ifndef DSS_PRIV_FILENAME
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24 #define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
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25 #endif
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26 #ifndef RSA_PRIV_FILENAME
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27 #define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
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28 #endif
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29 #ifndef ECDSA_PRIV_FILENAME
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30 #define ECDSA_PRIV_FILENAME "/etc/dropbear/dropbear_ecdsa_host_key"
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31 #endif
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32
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33 /* Set NON_INETD_MODE if you require daemon functionality (ie Dropbear listens
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34 * on chosen ports and keeps accepting connections. This is the default.
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35 *
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36 * Set INETD_MODE if you want to be able to run Dropbear with inetd (or
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37 * similar), where it will use stdin/stdout for connections, and each process
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38 * lasts for a single connection. Dropbear should be invoked with the -i flag
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39 * for inetd, and can only accept IPv4 connections.
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40 *
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41 * Both of these flags can be defined at once, don't compile without at least
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42 * one of them. */
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43 #define NON_INETD_MODE
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44 #define INETD_MODE
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45
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46 /* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is
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47 * perhaps 20% slower for pubkey operations (it is probably worth experimenting
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48 * if you want to use this) */
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49 /*#define NO_FAST_EXPTMOD*/
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51 /* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save
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52 several kB in binary size however will make the symmetrical ciphers and hashes
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53 slower, perhaps by 50%. Recommended for small systems that aren't doing
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54 much traffic. */
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55 #define DROPBEAR_SMALL_CODE
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56
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57 /* Enable X11 Forwarding - server only */
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58 #define ENABLE_X11FWD
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59
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60 /* Enable TCP Fowarding */
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61 /* 'Local' is "-L" style (client listening port forwarded via server)
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62 * 'Remote' is "-R" style (server listening port forwarded via client) */
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63
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64 #define ENABLE_CLI_LOCALTCPFWD
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65 #define ENABLE_CLI_REMOTETCPFWD
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66
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67 #define ENABLE_SVR_LOCALTCPFWD
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68 #define ENABLE_SVR_REMOTETCPFWD
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69
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70 /* Enable Authentication Agent Forwarding */
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71 #define ENABLE_SVR_AGENTFWD
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72 #define ENABLE_CLI_AGENTFWD
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75 /* Note: Both ENABLE_CLI_PROXYCMD and ENABLE_CLI_NETCAT must be set to
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76 * allow multihop dbclient connections */
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77
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78 /* Allow using -J <proxycommand> to run the connection through a
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79 pipe to a program, rather the normal TCP connection */
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80 #define ENABLE_CLI_PROXYCMD
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81
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82 /* Enable "Netcat mode" option. This will forward standard input/output
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83 * to a remote TCP-forwarded connection */
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84 #define ENABLE_CLI_NETCAT
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86 /* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */
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87 #define ENABLE_USER_ALGO_LIST
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88
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89 /* Encryption - at least one required.
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90 * Protocol RFC requires 3DES and recommends AES128 for interoperability.
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91 * Including multiple keysize variants the same cipher
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92 * (eg AES256 as well as AES128) will result in a minimal size increase.*/
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93 #define DROPBEAR_AES128
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94 #define DROPBEAR_3DES
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95 #define DROPBEAR_AES256
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96 /* Compiling in Blowfish will add ~6kB to runtime heap memory usage */
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97 /*#define DROPBEAR_BLOWFISH*/
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98 #define DROPBEAR_TWOFISH256
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99 #define DROPBEAR_TWOFISH128
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100
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101 /* Enable CBC mode for ciphers. This has security issues though
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102 * is the most compatible with older SSH implementations */
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103 #define DROPBEAR_ENABLE_CBC_MODE
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104
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105 /* Enable "Counter Mode" for ciphers. This is more secure than normal
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106 * CBC mode against certain attacks. It is recommended for security
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107 * and forwards compatibility */
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108 #define DROPBEAR_ENABLE_CTR_MODE
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109
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110 /* Twofish counter mode is disabled by default because it
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111 has not been tested for interoperability with other SSH implementations.
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112 If you test it please contact the Dropbear author */
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113 /* #define DROPBEAR_TWOFISH_CTR */
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114
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115 /* You can compile with no encryption if you want. In some circumstances
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116 * this could be safe security-wise, though make sure you know what
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117 * you're doing. Anyone can see everything that goes over the wire, so
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118 * the only safe auth method is public key. */
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119 /* #define DROPBEAR_NONE_CIPHER */
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120
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121 /* Message Integrity - at least one required.
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122 * Protocol RFC requires sha1 and recommends sha1-96.
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123 * sha1-96 is of use for slow links as it has a smaller overhead.
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124 *
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125 * There's no reason to disable sha1 or sha1-96 to save space since it's
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126 * used for the random number generator and public-key cryptography anyway.
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127 * Disabling it here will just stop it from being used as the integrity portion
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128 * of the ssh protocol.
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129 *
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130 * These hashes are also used for public key fingerprints in logs.
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131 * If you disable MD5, Dropbear will fall back to SHA1 fingerprints,
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132 * which are not the standard form. */
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133 #define DROPBEAR_SHA1_HMAC
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134 #define DROPBEAR_SHA1_96_HMAC
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135 #define DROPBEAR_SHA2_256_HMAC
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136 #define DROPBEAR_SHA2_512_HMAC
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137 #define DROPBEAR_MD5_HMAC
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138
252
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diff changeset
139 /* You can also disable integrity. Don't bother disabling this if you're
681
a4b7627b3157 Update insecure-nocrypto to current head
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140 * still using a cipher, it's relatively cheap. If you disable this it's dead
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141 * simple for an attacker to run arbitrary commands on the remote host. Beware. */
713
e22d5f5f6e37 Fix "-c none" so that it allows aes during authentication
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142 /* #define DROPBEAR_NONE_INTEGRITY */
252
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143
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144 /* Hostkey/public key algorithms - at least one required, these are used
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145 * for hostkey as well as for verifying signatures with pubkey auth.
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146 * Removing either of these won't save very much space.
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147 * SSH2 RFC Draft requires dss, recommends rsa */
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148 #define DROPBEAR_RSA
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149 #define DROPBEAR_DSS
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150 /* ECDSA is significantly faster than RSA or DSS. Compiling in ECC
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151 * code (either ECDSA or ECDH) increases binary size - around 30kB
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152 * on x86-64 */
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153 #define DROPBEAR_ECDSA
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154
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155 /* Generate hostkeys as-needed when the first connection using that key type occurs.
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156 This avoids the need to otherwise run "dropbearkey" and avoids some problems
850
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157 with badly seeded /dev/urandom when systems first boot.
851
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158 This also requires a runtime flag "-R". This adds ~4kB to binary size (or hardly
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159 anything if dropbearkey is linked in a "dropbearmulti" binary) */
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160 #define DROPBEAR_DELAY_HOSTKEY
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b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
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161
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162 /* Enable Curve25519 for key exchange. This is another elliptic
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163 * curve method with good security properties. Increases binary size
851
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164 * by ~8kB on x86-64 */
848
6c69e7df3621 curve25519
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165 #define DROPBEAR_CURVE25519
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166
850
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167 /* Enable elliptic curve Diffie Hellman key exchange, see note about
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168 * ECDSA above */
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169 #define DROPBEAR_ECDH
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170
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171 /* Group14 (2048 bit) is recommended. Group1 is less secure (1024 bit) though
739b3909c499 Get rid of group15, move group16 to sha512.
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172 is the only option for interoperability with some older SSH programs */
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173 #define DROPBEAR_DH_GROUP1 1
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174 #define DROPBEAR_DH_GROUP14 1
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175
555
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176 /* Control the memory/performance/compression tradeoff for zlib.
605
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177 * Set windowBits=8 for least memory usage, see your system's
555
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178 * zlib.h for full details.
605
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179 * Default settings (windowBits=15) will use 256kB for compression
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180 * windowBits=8 will use 129kB for compression.
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181 * Both modes will use ~35kB for decompression (using windowBits=15 for
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182 * interoperability) */
555
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183 #ifndef DROPBEAR_ZLIB_WINDOW_BITS
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184 #define DROPBEAR_ZLIB_WINDOW_BITS 15
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185 #endif
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186
996
47643024fc90 Disable non-delayed zlib for server
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187 /* Server won't allow zlib compression until after authentication. Prevents
47643024fc90 Disable non-delayed zlib for server
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188 flaws in the zlib library being unauthenticated exploitable flaws.
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189 Some old ssh clients may not support the alternative [email protected] method */
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190 #define DROPBEAR_SERVER_DELAY_ZLIB 1
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191
172
3e49d8d18005 * respect DO_HOST_LOOKUP config option
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192 /* Whether to do reverse DNS lookups. */
857
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193 /*#define DO_HOST_LOOKUP */
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194
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195 /* Whether to print the message of the day (MOTD). This doesn't add much code
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196 * size */
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197 #define DO_MOTD
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198
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199 /* The MOTD file path */
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200 #ifndef MOTD_FILENAME
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201 #define MOTD_FILENAME "/etc/motd"
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202 #endif
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203
121
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204 /* Authentication Types - at least one required.
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205 RFC Draft requires pubkey auth, and recommends password */
121
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diff changeset
206
628
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207 /* Note: PAM auth is quite simple and only works for PAM modules which just do
176
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208 * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
628
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209 * It's useful for systems like OS X where standard password crypts don't work
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210 * but there's an interface via a PAM module. It won't work for more complex
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211 * PAM challenge/response.
176
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212 * You can't enable both PASSWORD and PAM. */
121
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213
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214 /* This requires crypt() */
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215 #ifdef HAVE_CRYPT
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216 #define ENABLE_SVR_PASSWORD_AUTH
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217 #endif
499
f3ca5ebc319a Split options.h out into sysoptions.h for options that aren't usually
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218 /* PAM requires ./configure --enable-pam */
847
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219 /*#define ENABLE_SVR_PAM_AUTH */
68
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diff changeset
220 #define ENABLE_SVR_PUBKEY_AUTH
66
38c3146aa23d Some more sanity-checking of args, and just warn and ignore OpenSSH args
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diff changeset
221
566
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diff changeset
222 /* Whether to take public key options in
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diff changeset
223 * authorized_keys file into account */
475
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
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parents: 473
diff changeset
224 #ifdef ENABLE_SVR_PUBKEY_AUTH
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
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diff changeset
225 #define ENABLE_SVR_PUBKEY_OPTIONS
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diff changeset
226 #endif
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diff changeset
227
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diff changeset
228 /* This requires getpass. */
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diff changeset
229 #ifdef HAVE_GETPASS
68
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diff changeset
230 #define ENABLE_CLI_PASSWORD_AUTH
1158
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diff changeset
231 #define ENABLE_CLI_INTERACT_AUTH
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diff changeset
232 #endif
68
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diff changeset
233 #define ENABLE_CLI_PUBKEY_AUTH
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234
995
6fb4c010c448 Default client key path ~/.ssh/id_dropbear
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diff changeset
235 /* A default argument for dbclient -i <privatekey>.
1134
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diff changeset
236 Homedir is prepended unless path begins with / */
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diff changeset
237 #define DROPBEAR_DEFAULT_CLI_AUTHKEY ".ssh/id_dropbear"
995
6fb4c010c448 Default client key path ~/.ssh/id_dropbear
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diff changeset
238
441
fdf06a5a54e4 Allow reading dbclient password from an environment var
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diff changeset
239 /* This variable can be used to set a password for client
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diff changeset
240 * authentication on the commandline. Beware of platforms
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diff changeset
241 * that don't protect environment variables of processes etc. Also
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diff changeset
242 * note that it will be provided for all "hidden" client-interactive
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diff changeset
243 * style prompts - if you want something more sophisticated, use
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diff changeset
244 * SSH_ASKPASS instead. Comment out this var to remove this functionality.*/
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diff changeset
245 #define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
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diff changeset
246
173
257f09a63dab * add SSH_ASKPASS support (based on patch from Paul Whittaker
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diff changeset
247 /* Define this (as well as ENABLE_CLI_PASSWORD_AUTH) to allow the use of
257f09a63dab * add SSH_ASKPASS support (based on patch from Paul Whittaker
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parents: 172
diff changeset
248 * a helper program for the ssh client. The helper program should be
257f09a63dab * add SSH_ASKPASS support (based on patch from Paul Whittaker
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parents: 172
diff changeset
249 * specified in the SSH_ASKPASS environment variable, and dbclient
257f09a63dab * add SSH_ASKPASS support (based on patch from Paul Whittaker
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parents: 172
diff changeset
250 * should be run with DISPLAY set and no tty. The program should
257f09a63dab * add SSH_ASKPASS support (based on patch from Paul Whittaker
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parents: 172
diff changeset
251 * return the password on standard output */
257f09a63dab * add SSH_ASKPASS support (based on patch from Paul Whittaker
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diff changeset
252 /*#define ENABLE_CLI_ASKPASS_HELPER*/
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diff changeset
253
900
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254 /* Save a network roundtrip by sendng a real auth request immediately after
49ed526daedc CHANGES for 2014.63
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255 * sending a query for the available methods. It is at the expense of < 100
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diff changeset
256 * bytes of extra network traffic. This is not yet enabled by default since it
49ed526daedc CHANGES for 2014.63
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diff changeset
257 * could cause problems with non-compliant servers */
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diff changeset
258 /* #define DROPBEAR_CLI_IMMEDIATE_AUTH */
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diff changeset
259
687
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diff changeset
260 /* Source for randomness. This must be able to provide hundreds of bytes per SSH
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diff changeset
261 * connection without blocking. In addition /dev/random is used for seeding
167fdc091c05 Improve RNG seeding.
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diff changeset
262 * rsa/dss key generation */
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diff changeset
263 #define DROPBEAR_URANDOM_DEV "/dev/urandom"
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264
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diff changeset
265 /* Set this to use PRNGD or EGD instead of /dev/urandom or /dev/random */
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diff changeset
266 /*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/
442
d82a2a44c684 Add -u option to specify /dev/urandom instead
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parents: 441
diff changeset
267
4
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268
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269 /* Specify the number of clients we will allow to be connected but
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270 * not yet authenticated. After this limit, connections are rejected */
277
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271 /* The first setting is per-IP, to avoid denial of service */
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272 #ifndef MAX_UNAUTH_PER_IP
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273 #define MAX_UNAUTH_PER_IP 5
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274 #endif
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275
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276 /* And then a global limit to avoid chewing memory if connections
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277 * come from many IPs */
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278 #ifndef MAX_UNAUTH_CLIENTS
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279 #define MAX_UNAUTH_CLIENTS 30
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280 #endif
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281
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282 /* Maximum number of failed authentication tries (server option) */
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283 #ifndef MAX_AUTH_TRIES
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284 #define MAX_AUTH_TRIES 10
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285 #endif
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286
437
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287 /* The default file to store the daemon's process ID, for shutdown
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288 scripts etc. This can be overridden with the -P flag */
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289 #ifndef DROPBEAR_PIDFILE
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290 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
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291 #endif
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292
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293 /* The command to invoke for xauth when using X11 forwarding.
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294 * "-q" for quiet */
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295 #ifndef XAUTH_COMMAND
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296 #define XAUTH_COMMAND "/usr/bin/xauth -q"
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297 #endif
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298
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299 /* if you want to enable running an sftp server (such as the one included with
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300 * OpenSSH), set the path below. If the path isn't defined, sftp will not
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301 * be enabled */
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302 #ifndef SFTPSERVER_PATH
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303 #define SFTPSERVER_PATH "/usr/libexec/sftp-server"
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304 #endif
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305
66
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306 /* This is used by the scp binary when used as a client binary. If you're
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307 * not using the Dropbear client, you'll need to change it */
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308 #define DROPBEAR_PATH_SSH_PROGRAM "/usr/bin/dbclient"
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309
349
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310 /* Whether to log commands executed by a client. This only logs the
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311 * (single) command sent to the server, not what a user did in a
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312 * shell/sftp session etc. */
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313 /* #define LOG_COMMANDS */
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314
448
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315 /* Window size limits. These tend to be a trade-off between memory
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316 usage and network performance: */
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317 /* Size of the network receive window. This amount of memory is allocated
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318 as a per-channel receive buffer. Increasing this value can make a
449
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319 significant difference to network performance. 24kB was empirically
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320 chosen for a 100mbit ethernet network. The value can be altered at
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321 runtime with the -W argument. */
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322 #ifndef DEFAULT_RECV_WINDOW
449
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323 #define DEFAULT_RECV_WINDOW 24576
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324 #endif
448
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325 /* Maximum size of a received SSH data packet - this _MUST_ be >= 32768
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326 in order to interoperate with other implementations */
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327 #ifndef RECV_MAX_PAYLOAD_LEN
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328 #define RECV_MAX_PAYLOAD_LEN 32768
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329 #endif
448
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330 /* Maximum size of a transmitted data packet - this can be any value,
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331 though increasing it may not make a significant difference. */
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332 #ifndef TRANS_MAX_PAYLOAD_LEN
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333 #define TRANS_MAX_PAYLOAD_LEN 16384
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334 #endif
448
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335
454
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336 /* Ensure that data is transmitted every KEEPALIVE seconds. This can
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337 be overridden at runtime with -K. 0 disables keepalives */
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338 #define DEFAULT_KEEPALIVE 0
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339
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340 /* If this many KEEPALIVES are sent with no packets received from the
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341 other side, exit. Not run-time configurable - if you have a need
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342 for runtime configuration please mail the Dropbear list */
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343 #define DEFAULT_KEEPALIVE_LIMIT 3
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344
513
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345 /* Ensure that data is received within IDLE_TIMEOUT seconds. This can
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346 be overridden at runtime with -I. 0 disables idle timeouts */
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347 #define DEFAULT_IDLE_TIMEOUT 0
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348
508
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349 /* The default path. This will often get replaced by the shell */
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350 #define DEFAULT_PATH "/usr/bin:/bin"
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351
499
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352 /* Some other defines (that mostly should be left alone) are defined
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353 * in sysoptions.h */
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354 #include "sysoptions.h"
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355
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356 #endif /* DROPBEAR_OPTIONS_H_ */