annotate sysoptions.h @ 1441:93d2bf610d0b

Merge pull request #45 from bengardner/DROPBEAR_LISTEN_BACKLOG sysoptions.h: Add ability to override DROPBEAR_LISTEN_BACKLOG
author Matt Johnston <matt@ucc.asn.au>
date Sun, 25 Jun 2017 23:22:11 +0800
parents 7672b13c5367 8b74d5f876a7
children 533e070b3126
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1 /*******************************************************************
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2 * You shouldn't edit this file unless you know you need to.
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3 * This file is only included from options.h
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4 *******************************************************************/
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5
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6 #ifndef DROPBEAR_VERSION
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7 #define DROPBEAR_VERSION "2017.75"
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8 #endif
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9
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10 #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
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11 #define PROGNAME "dropbear"
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12
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13 /* Spec recommends after one hour or 1 gigabyte of data. One hour
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14 * is a bit too verbose, so we try 8 hours */
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15 #ifndef KEX_REKEY_TIMEOUT
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16 #define KEX_REKEY_TIMEOUT (3600 * 8)
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17 #endif
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18 #ifndef KEX_REKEY_DATA
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19 #define KEX_REKEY_DATA (1<<30) /* 2^30 == 1GB, this value must be < INT_MAX */
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20 #endif
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21 /* Close connections to clients which haven't authorised after AUTH_TIMEOUT */
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22 #ifndef AUTH_TIMEOUT
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23 #define AUTH_TIMEOUT 300 /* we choose 5 minutes */
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24 #endif
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25
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26 #define DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT ((DROPBEAR_SVR_PUBKEY_AUTH) && (DROPBEAR_SVR_PUBKEY_OPTIONS))
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27
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28 /* A client should try and send an initial key exchange packet guessing
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29 * the algorithm that will match - saves a round trip connecting, has little
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30 * overhead if the guess was "wrong". */
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31 #ifndef DROPBEAR_KEX_FIRST_FOLLOWS
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32 #define DROPBEAR_KEX_FIRST_FOLLOWS 1
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33 #endif
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34 /* Use protocol extension to allow "first follows" to succeed more frequently.
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35 * This is currently Dropbear-specific but will gracefully fallback when connecting
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36 * to other implementations. */
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37 #ifndef DROPBEAR_KEXGUESS2
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38 #define DROPBEAR_KEXGUESS2 1
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39 #endif
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41 /* Minimum key sizes for DSS and RSA */
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42 #ifndef MIN_DSS_KEYLEN
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43 #define MIN_DSS_KEYLEN 1024
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44 #endif
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45 #ifndef MIN_RSA_KEYLEN
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46 #define MIN_RSA_KEYLEN 1024
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47 #endif
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48
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49 #define MAX_BANNER_SIZE 2000 /* this is 25*80 chars, any more is foolish */
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50 #define MAX_BANNER_LINES 20 /* How many lines the client will display */
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51
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52 /* the number of NAME=VALUE pairs to malloc for environ, if we don't have
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53 * the clearenv() function */
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54 #define ENV_SIZE 100
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55
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56 #define MAX_CMD_LEN 9000 /* max length of a command */
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57 #define MAX_TERM_LEN 200 /* max length of TERM name */
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58
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59 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
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60 #define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
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61
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62 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
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63 ipv4 and ipv6 don't count twice */
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64
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65 /* Each port might have at least a v4 and a v6 address */
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66 #define MAX_LISTEN_ADDR (DROPBEAR_MAX_PORTS*3)
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67
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68 #define _PATH_TTY "/dev/tty"
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69
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70 #define _PATH_CP "/bin/cp"
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71
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72 #define DROPBEAR_ESCAPE_CHAR '~'
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73
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74 /* success/failure defines */
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75 #define DROPBEAR_SUCCESS 0
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76 #define DROPBEAR_FAILURE -1
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77
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78 #define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
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79
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80 /* Required for pubkey auth */
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81 #define DROPBEAR_SIGNKEY_VERIFY ((DROPBEAR_SVR_PUBKEY_AUTH) || (DROPBEAR_CLIENT))
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82
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83 #define SHA1_HASH_SIZE 20
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84 #define MD5_HASH_SIZE 16
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85 #define MAX_HASH_SIZE 64 /* sha512 */
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86
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87 #define MAX_KEY_LEN 32 /* 256 bits for aes256 etc */
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88 #define MAX_IV_LEN 20 /* must be same as max blocksize, */
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89
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90 #if DROPBEAR_SHA2_512_HMAC
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91 #define MAX_MAC_LEN 64
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92 #elif DROPBEAR_SHA2_256_HMAC
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93 #define MAX_MAC_LEN 32
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94 #else
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95 #define MAX_MAC_LEN 20
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96 #endif
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97
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98
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99 #define DROPBEAR_ECC ((DROPBEAR_ECDH) || (DROPBEAR_ECDSA))
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100
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101 /* Debian doesn't define this in system headers */
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102 #if !defined(LTM_DESC) && (DROPBEAR_ECC)
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103 #define LTM_DESC
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104 #endif
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105
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106 #define DROPBEAR_ECC_256 (DROPBEAR_ECC)
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107 #define DROPBEAR_ECC_384 (DROPBEAR_ECC)
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108 #define DROPBEAR_ECC_521 (DROPBEAR_ECC)
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109
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110 #define DROPBEAR_LTC_PRNG (DROPBEAR_ECC)
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111
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112 /* RSA can be vulnerable to timing attacks which use the time required for
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113 * signing to guess the private key. Blinding avoids this attack, though makes
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114 * signing operations slightly slower. */
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115 #define DROPBEAR_RSA_BLINDING 1
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116
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117 /* hashes which will be linked and registered */
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118 #define DROPBEAR_SHA256 ((DROPBEAR_SHA2_256_HMAC) || (DROPBEAR_ECC_256) \
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119 || (DROPBEAR_CURVE25519) || (DROPBEAR_DH_GROUP14_SHA256))
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120 #define DROPBEAR_SHA384 (DROPBEAR_ECC_384)
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121 /* LTC SHA384 depends on SHA512 */
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122 #define DROPBEAR_SHA512 ((DROPBEAR_SHA2_512_HMAC) || (DROPBEAR_ECC_521) \
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123 || (DROPBEAR_SHA384) || (DROPBEAR_DH_GROUP16))
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124 #define DROPBEAR_MD5 (DROPBEAR_MD5_HMAC)
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125
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126 #define DROPBEAR_DH_GROUP14 ((DROPBEAR_DH_GROUP14_SHA256) || (DROPBEAR_DH_GROUP14_SHA1))
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127
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128 #define DROPBEAR_NORMAL_DH ((DROPBEAR_DH_GROUP1) || (DROPBEAR_DH_GROUP14) || (DROPBEAR_DH_GROUP16))
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129
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130 /* roughly 2x 521 bits */
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131 #define MAX_ECC_SIZE 140
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132
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133 #define MAX_NAME_LEN 64 /* maximum length of a protocol name, isn't
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134 explicitly specified for all protocols (just
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135 for algos) but seems valid */
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136
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137 #define MAX_PROPOSED_ALGO 20
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138
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139 /* size/count limits */
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140 /* From transport rfc */
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141 #define MIN_PACKET_LEN 16
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142
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143 #define RECV_MAX_PACKET_LEN (MAX(35000, ((RECV_MAX_PAYLOAD_LEN)+100)))
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144
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145 /* for channel code */
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146 #define TRANS_MAX_WINDOW 500000000 /* 500MB is sufficient, stopping overflow */
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147 #define TRANS_MAX_WIN_INCR 500000000 /* overflow prevention */
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148
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149 #define RECV_WINDOWEXTEND (opts.recv_window / 3) /* We send a "window extend" every
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150 RECV_WINDOWEXTEND bytes */
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151 #define MAX_RECV_WINDOW (1024*1024) /* 1 MB should be enough */
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152
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153 #define MAX_CHANNELS 1000 /* simple mem restriction, includes each tcp/x11
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154 connection, so can't be _too_ small */
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155
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156 #define MAX_STRING_LEN (MAX(MAX_CMD_LEN, 2400)) /* Sun SSH needs 2400 for algos,
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157 MAX_CMD_LEN is usually longer */
499
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158
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159 /* For a 4096 bit DSS key, empirically determined */
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160 #define MAX_PUBKEY_SIZE 1700
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161 /* For a 4096 bit DSS key, empirically determined */
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162 #define MAX_PRIVKEY_SIZE 1700
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163
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164 #define MAX_HOSTKEYS 3
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165
499
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166 /* The maximum size of the bignum portion of the kexhash buffer */
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167 /* Sect. 8 of the transport rfc 4253, K_S + e + f + K */
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168 #define KEXHASHBUF_MAX_INTS (1700 + 130 + 130 + 130)
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169
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170 #define DROPBEAR_MAX_SOCKS 2 /* IPv4, IPv6 are all we'll get for now. Revisit
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171 in a few years time.... */
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172
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173 #define DROPBEAR_MAX_CLI_PASS 1024
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174
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175 #define DROPBEAR_MAX_CLI_INTERACT_PROMPTS 80 /* The number of prompts we'll
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176 accept for keyb-interactive
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177 auth */
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178
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179
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180 #define DROPBEAR_AES ((DROPBEAR_AES256) || (DROPBEAR_AES128))
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181
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182 #define DROPBEAR_TWOFISH ((DROPBEAR_TWOFISH256) || (DROPBEAR_TWOFISH128))
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183
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184 #define DROPBEAR_CLI_ANYTCPFWD ((DROPBEAR_CLI_REMOTETCPFWD) || (DROPBEAR_CLI_LOCALTCPFWD))
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185
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186 #define DROPBEAR_TCP_ACCEPT ((DROPBEAR_CLI_LOCALTCPFWD) || (DROPBEAR_SVR_REMOTETCPFWD))
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187
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188 #define DROPBEAR_LISTENERS \
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189 ((DROPBEAR_CLI_REMOTETCPFWD) || (DROPBEAR_CLI_LOCALTCPFWD) || \
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190 (DROPBEAR_SVR_REMOTETCPFWD) || (DROPBEAR_SVR_LOCALTCPFWD) || \
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191 (DROPBEAR_SVR_AGENTFWD) || (DROPBEAR_X11FWD))
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192
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193 #define DROPBEAR_CLI_MULTIHOP ((DROPBEAR_CLI_NETCAT) && (DROPBEAR_CLI_PROXYCMD))
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194
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195 #define ENABLE_CONNECT_UNIX ((DROPBEAR_CLI_AGENTFWD) || (DROPBEAR_PRNGD_SOCKET))
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cf376c696dfc Make it compile, update for changes in channel structure.
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196
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197 /* if we're using authorized_keys or known_hosts */
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198 #define DROPBEAR_KEY_LINES ((DROPBEAR_CLIENT) || (DROPBEAR_SVR_PUBKEY_AUTH))
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199
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200 /* Changing this is inadvisable, it appears to have problems
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201 * with flushing compressed data */
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202 #define DROPBEAR_ZLIB_MEM_LEVEL 8
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203
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204 #if (DROPBEAR_SVR_PASSWORD_AUTH) && (DROPBEAR_SVR_PAM_AUTH)
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205 #error "You can't turn on PASSWORD and PAM auth both at once. Fix it in options.h"
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206 #endif
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207
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208 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
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209 * code, if we're just compiling as client or server */
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210 #if (DROPBEAR_SERVER) && (DROPBEAR_CLIENT)
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211
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212 #define IS_DROPBEAR_SERVER (ses.isserver == 1)
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213 #define IS_DROPBEAR_CLIENT (ses.isserver == 0)
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214
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215 #elif DROPBEAR_SERVER
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216
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217 #define IS_DROPBEAR_SERVER 1
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218 #define IS_DROPBEAR_CLIENT 0
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219
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220 #elif DROPBEAR_CLIENT
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221
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222 #define IS_DROPBEAR_SERVER 0
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223 #define IS_DROPBEAR_CLIENT 1
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224
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225 #else
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226 /* Just building key utils? */
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227 #define IS_DROPBEAR_SERVER 0
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228 #define IS_DROPBEAR_CLIENT 0
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229
667
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230 #endif /* neither DROPBEAR_SERVER nor DROPBEAR_CLIENT */
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231
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232 #ifdef HAVE_FORK
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233 #define DROPBEAR_VFORK 0
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234 #else
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235 #define DROPBEAR_VFORK 1
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236 #endif
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237
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238 #ifndef DROPBEAR_LISTEN_BACKLOG
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239 #if MAX_UNAUTH_CLIENTS > MAX_CHANNELS
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240 #define DROPBEAR_LISTEN_BACKLOG MAX_UNAUTH_CLIENTS
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241 #else
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242 #define DROPBEAR_LISTEN_BACKLOG MAX_CHANNELS
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243 #endif
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244 #endif
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245
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246 #ifndef DROPBEAR_NONE_CIPHER
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247 #define DROPBEAR_NONE_CIPHER 0
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248 #endif
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249
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250 /* free memory before exiting */
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251 #define DROPBEAR_CLEANUP 1
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252
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253 /* Use this string since some implementations might special-case it */
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254 #define DROPBEAR_KEEPALIVE_STRING "[email protected]h.com"
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255
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256 /* Linux will attempt TCP fast open, falling back if not supported by the kernel.
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257 * Currently server is enabled but client is disabled by default until there
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258 * is further compatibility testing */
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259 #ifdef __linux__
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260 #define DROPBEAR_SERVER_TCP_FAST_OPEN 1
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261 #define DROPBEAR_CLIENT_TCP_FAST_OPEN 0
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262 #else
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263 #define DROPBEAR_SERVER_TCP_FAST_OPEN 0
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264 #define DROPBEAR_CLIENT_TCP_FAST_OPEN 0
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265 #endif
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266
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267 /* no include guard for this file */