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annotate sysoptions.h @ 1195:8a5e9a97bd7a

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Merge pull request #15 from annulen/fix_cli_remotetcpfwd Fixed build when ENABLE_CLI_REMOTETCPFWD is the only allowed TCP forw…
author Matt Johnston <matt@ucc.asn.au>
date Mon, 30 Nov 2015 21:13:03 +0800
parents 88fd422cfa11
children 9a944a243f08
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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 "2015.70"
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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 /* A client should try and send an initial key exchange packet guessing
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27 * the algorithm that will match - saves a round trip connecting, has little
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28 * overhead if the guess was "wrong". */
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29 #define USE_KEX_FIRST_FOLLOWS
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30 /* Use protocol extension to allow "first follows" to succeed more frequently.
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31 * This is currently Dropbear-specific but will gracefully fallback when connecting
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32 * to other implementations. */
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33 #define USE_KEXGUESS2
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34
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35 /* Minimum key sizes for DSS and RSA */
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36 #ifndef MIN_DSS_KEYLEN
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37 #define MIN_DSS_KEYLEN 512
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38 #endif
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39 #ifndef MIN_RSA_KEYLEN
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40 #define MIN_RSA_KEYLEN 512
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41 #endif
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42
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43 #define MAX_BANNER_SIZE 2000 /* this is 25*80 chars, any more is foolish */
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44 #define MAX_BANNER_LINES 20 /* How many lines the client will display */
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45
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46 /* the number of NAME=VALUE pairs to malloc for environ, if we don't have
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47 * the clearenv() function */
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48 #define ENV_SIZE 100
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49
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50 #define MAX_CMD_LEN 9000 /* max length of a command */
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51 #define MAX_TERM_LEN 200 /* max length of TERM name */
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52
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53 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
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54 #define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
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55
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56 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
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57 ipv4 and ipv6 don't count twice */
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58
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59 /* Each port might have at least a v4 and a v6 address */
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60 #define MAX_LISTEN_ADDR (DROPBEAR_MAX_PORTS*3)
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61
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62 #define _PATH_TTY "/dev/tty"
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63
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64 #define _PATH_CP "/bin/cp"
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65
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66 #define DROPBEAR_ESCAPE_CHAR '~'
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67
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68 /* success/failure defines */
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69 #define DROPBEAR_SUCCESS 0
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70 #define DROPBEAR_FAILURE -1
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71
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72 /* Required for pubkey auth */
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73 #if defined(ENABLE_SVR_PUBKEY_AUTH) || defined(DROPBEAR_CLIENT)
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74 #define DROPBEAR_SIGNKEY_VERIFY
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75 #endif
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76
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77 #define SHA1_HASH_SIZE 20
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78 #define MD5_HASH_SIZE 16
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79 #define MAX_HASH_SIZE 64 /* sha512 */
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80
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81 #define MAX_KEY_LEN 32 /* 256 bits for aes256 etc */
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82 #define MAX_IV_LEN 20 /* must be same as max blocksize, */
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83
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84 #if defined(DROPBEAR_SHA2_512_HMAC)
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85 #define MAX_MAC_LEN 64
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86 #elif defined(DROPBEAR_SHA2_256_HMAC)
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87 #define MAX_MAC_LEN 32
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88 #else
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89 #define MAX_MAC_LEN 20
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90 #endif
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92 #if defined(DROPBEAR_ECDH) || defined (DROPBEAR_ECDSA)
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93 #define DROPBEAR_ECC
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94 /* Debian doesn't define this in system headers */
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95 #ifndef LTM_DESC
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96 #define LTM_DESC
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97 #endif
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98 #endif
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99
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100 #ifdef DROPBEAR_ECC
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101 #define DROPBEAR_ECC_256
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102 #define DROPBEAR_ECC_384
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103 #define DROPBEAR_ECC_521
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104 #endif
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105
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106 #ifdef DROPBEAR_ECC
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107 #define DROPBEAR_LTC_PRNG
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108 #endif
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109
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110 /* RSA can be vulnerable to timing attacks which use the time required for
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111 * signing to guess the private key. Blinding avoids this attack, though makes
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112 * signing operations slightly slower. */
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113 #define RSA_BLINDING
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114
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115 /* hashes which will be linked and registered */
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116 #if defined(DROPBEAR_SHA2_256_HMAC) || defined(DROPBEAR_ECC_256) || defined(DROPBEAR_CURVE25519)
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117 #define DROPBEAR_SHA256
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118 #endif
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119 #if defined(DROPBEAR_ECC_384)
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120 #define DROPBEAR_SHA384
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121 #endif
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122 /* LTC SHA384 depends on SHA512 */
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123 #if defined(DROPBEAR_SHA2_512_HMAC) || defined(DROPBEAR_ECC_521) || defined(DROPBEAR_ECC_384)
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124 #define DROPBEAR_SHA512
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125 #endif
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126 #if defined(DROPBEAR_MD5_HMAC)
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127 #define DROPBEAR_MD5
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128 #endif
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129
847
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130 /* roughly 2x 521 bits */
755
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131 #define MAX_ECC_SIZE 140
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132
499
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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 */
603
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140 /* From transport rfc */
499
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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
1169
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153 #define MAX_CHANNELS 1000 /* simple mem restriction, includes each tcp/x11
499
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154 connection, so can't be _too_ small */
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155
1138
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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
795
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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 */
499
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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
883
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179
502
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180 #if defined(DROPBEAR_AES256) || defined(DROPBEAR_AES128)
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181 #define DROPBEAR_AES
499
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182 #endif
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183
502
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184 #if defined(DROPBEAR_TWOFISH256) || defined(DROPBEAR_TWOFISH128)
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185 #define DROPBEAR_TWOFISH
499
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186 #endif
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187
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188 #ifndef ENABLE_X11FWD
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189 #define DISABLE_X11FWD
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190 #endif
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191
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192 #if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD)
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193 #define ENABLE_CLI_ANYTCPFWD
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194 #endif
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195
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196 #if defined(ENABLE_CLI_LOCALTCPFWD) || defined(ENABLE_SVR_REMOTETCPFWD)
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197 #define DROPBEAR_TCP_ACCEPT
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198 #endif
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199
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200 #if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD) || \
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201 defined(ENABLE_SVR_REMOTETCPFWD) || defined(ENABLE_SVR_LOCALTCPFWD) || \
547
cf376c696dfc Make it compile, update for changes in channel structure.
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202 defined(ENABLE_SVR_AGENTFWD) || defined(ENABLE_X11FWD)
499
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203 #define USING_LISTENERS
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204 #endif
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205
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206 #if defined(ENABLE_CLI_NETCAT) && defined(ENABLE_CLI_PROXYCMD)
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207 #define ENABLE_CLI_MULTIHOP
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208 #endif
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209
547
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210 #if defined(ENABLE_CLI_AGENTFWD) || defined(DROPBEAR_PRNGD_SOCKET)
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211 #define ENABLE_CONNECT_UNIX
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212 #endif
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213
499
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214 #if defined(DROPBEAR_CLIENT) || defined(ENABLE_SVR_PUBKEY_AUTH)
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215 #define DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */
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216 #endif
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217
605
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218 /* Changing this is inadvisable, it appears to have problems
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219 * with flushing compressed data */
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220 #define DROPBEAR_ZLIB_MEM_LEVEL 8
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221
499
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222 #if defined(ENABLE_SVR_PASSWORD_AUTH) && defined(ENABLE_SVR_PAM_AUTH)
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223 #error "You can't turn on PASSWORD and PAM auth both at once. Fix it in options.h"
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224 #endif
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225
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226 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
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227 * code, if we're just compiling as client or server */
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228 #if defined(DROPBEAR_SERVER) && defined(DROPBEAR_CLIENT)
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229
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230 #define IS_DROPBEAR_SERVER (ses.isserver == 1)
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231 #define IS_DROPBEAR_CLIENT (ses.isserver == 0)
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232
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233 #elif defined(DROPBEAR_SERVER)
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234
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235 #define IS_DROPBEAR_SERVER 1
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236 #define IS_DROPBEAR_CLIENT 0
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237
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238 #elif defined(DROPBEAR_CLIENT)
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239
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240 #define IS_DROPBEAR_SERVER 0
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241 #define IS_DROPBEAR_CLIENT 1
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242
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243 #else
521
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244 /* Just building key utils? */
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245 #define IS_DROPBEAR_SERVER 0
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246 #define IS_DROPBEAR_CLIENT 0
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247
667
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248 #endif /* neither DROPBEAR_SERVER nor DROPBEAR_CLIENT */
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249
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250 #ifndef HAVE_FORK
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251 #define USE_VFORK
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252 #endif /* don't HAVE_FORK */
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253
936
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254 #if MAX_UNAUTH_CLIENTS > MAX_CHANNELS
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255 #define DROPBEAR_LISTEN_BACKLOG MAX_UNAUTH_CLIENTS
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256 #else
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257 #define DROPBEAR_LISTEN_BACKLOG MAX_CHANNELS
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258 #endif
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259
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260 /* free memory before exiting */
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261 #define DROPBEAR_CLEANUP
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262
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263 /* Use this string since some implementations might special-case it */
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264 #define DROPBEAR_KEEPALIVE_STRING "[email protected]"
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265
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266 /* Linux will attempt TCP fast open, falling back if not supported by the kernel.
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267 * Currently server is enabled but client is disabled by default until there
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268 * is further compatibility testing */
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269 #ifdef __linux__
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270 #define DROPBEAR_SERVER_TCP_FAST_OPEN
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271 /* #define DROPBEAR_CLIENT_TCP_FAST_OPEN */
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272 #endif
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273
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274 /* no include guard for this file */