annotate sysoptions.h @ 1891:40f8468ad4d4

Allow for DEBUG_TRACE value 0 - 5
author HansH111 <hans@atbas.org>
date Sat, 19 Mar 2022 08:54:25 +0000
parents 6f265a35159a
children 13cb8cc1b0e4
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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 "2020.81"
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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 #if !(NON_INETD_MODE || INETD_MODE)
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29 #error "NON_INETD_MODE or INETD_MODE (or both) must be enabled."
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30 #endif
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32 /* Would probably work on freebsd but hasn't been tested */
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33 #if defined(HAVE_FEXECVE) && DROPBEAR_REEXEC && defined(__linux__)
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34 #define DROPBEAR_DO_REEXEC 1
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35 #else
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36 #define DROPBEAR_DO_REEXEC 0
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37 #endif
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38
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39 /* A client should try and send an initial key exchange packet guessing
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40 * the algorithm that will match - saves a round trip connecting, has little
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41 * overhead if the guess was "wrong". */
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42 #ifndef DROPBEAR_KEX_FIRST_FOLLOWS
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43 #define DROPBEAR_KEX_FIRST_FOLLOWS 1
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44 #endif
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45 /* Use protocol extension to allow "first follows" to succeed more frequently.
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46 * This is currently Dropbear-specific but will gracefully fallback when connecting
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47 * to other implementations. */
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48 #ifndef DROPBEAR_KEXGUESS2
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49 #define DROPBEAR_KEXGUESS2 1
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50 #endif
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52 /* Minimum key sizes for DSS and RSA */
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53 #ifndef MIN_DSS_KEYLEN
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54 #define MIN_DSS_KEYLEN 1024
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55 #endif
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56 #ifndef MIN_RSA_KEYLEN
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57 #define MIN_RSA_KEYLEN 1024
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58 #endif
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59
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60 #define MAX_BANNER_SIZE 2050 /* this is 25*80 chars, any more is foolish */
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61 #define MAX_BANNER_LINES 20 /* How many lines the client will display */
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62
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63 /* the number of NAME=VALUE pairs to malloc for environ, if we don't have
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64 * the clearenv() function */
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65 #define ENV_SIZE 100
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66
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67 #define MAX_CMD_LEN 9000 /* max length of a command */
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68 #define MAX_TERM_LEN 200 /* max length of TERM name */
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69
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70 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
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71 #define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
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72
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73 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
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74 ipv4 and ipv6 don't count twice */
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75
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76 /* Each port might have at least a v4 and a v6 address */
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77 #define MAX_LISTEN_ADDR (DROPBEAR_MAX_PORTS*3)
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78
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79 #define _PATH_TTY "/dev/tty"
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80
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81 #define _PATH_CP "/bin/cp"
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82
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83 #define DROPBEAR_ESCAPE_CHAR '~'
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84
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85 /* success/failure defines */
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86 #define DROPBEAR_SUCCESS 0
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87 #define DROPBEAR_FAILURE -1
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89 #define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
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91 #define DROPBEAR_NGROUP_MAX 1024
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92
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93 /* Required for pubkey auth */
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94 #define DROPBEAR_SIGNKEY_VERIFY ((DROPBEAR_SVR_PUBKEY_AUTH) || (DROPBEAR_CLIENT))
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96 /* crypt(password) must take less time than the auth failure delay
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97 (250ms set in svr-auth.c). On Linux the delay depends on
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98 password length, 100 characters here was empirically derived.
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99
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100 If a longer password is allowed Dropbear cannot compensate
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101 for the crypt time which will expose which usernames exist */
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102 #define DROPBEAR_MAX_PASSWORD_LEN 100
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103
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104 #define SHA1_HASH_SIZE 20
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105 #define SHA256_HASH_SIZE 32
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106 #define MD5_HASH_SIZE 16
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107 #define MAX_HASH_SIZE 64 /* sha512 */
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108
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109 #if DROPBEAR_CHACHA20POLY1305
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110 #define MAX_KEY_LEN 64 /* 2 x 256 bits for chacha20 */
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111 #else
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112 #define MAX_KEY_LEN 32 /* 256 bits for aes256 etc */
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113 #endif
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114 #define MAX_IV_LEN 20 /* must be same as max blocksize, */
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115
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116 #if DROPBEAR_SHA2_512_HMAC
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117 #define MAX_MAC_LEN 64
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118 #elif DROPBEAR_SHA2_256_HMAC
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119 #define MAX_MAC_LEN 32
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120 #else
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121 #define MAX_MAC_LEN 20
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122 #endif
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124 /* sha2-512 is not necessary unless unforseen problems arise with sha2-256 */
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125 #ifndef DROPBEAR_SHA2_512_HMAC
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126 #define DROPBEAR_SHA2_512_HMAC 0
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127 #endif
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128
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129 /* might be needed for compatibility with very old implementations */
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130 #ifndef DROPBEAR_MD5_HMAC
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131 #define DROPBEAR_MD5_HMAC 0
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132 #endif
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133
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134 /* Twofish counter mode is disabled by default because it
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135 has not been tested for interoperability with other SSH implementations.
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136 If you test it please contact the Dropbear author */
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137 #ifndef DROPBEAR_TWOFISH_CTR
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138 #define DROPBEAR_TWOFISH_CTR 0
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139 #endif
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140
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141
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142 #define DROPBEAR_ECC ((DROPBEAR_ECDH) || (DROPBEAR_ECDSA))
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143
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144 /* Debian doesn't define this in system headers */
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145 #if !defined(LTM_DESC) && (DROPBEAR_ECC)
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146 #define LTM_DESC
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147 #endif
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148
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149 #define DROPBEAR_ECC_256 (DROPBEAR_ECC)
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150 #define DROPBEAR_ECC_384 (DROPBEAR_ECC)
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151 #define DROPBEAR_ECC_521 (DROPBEAR_ECC)
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152
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153 #define DROPBEAR_LTC_PRNG (DROPBEAR_ECC)
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154
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155 /* RSA can be vulnerable to timing attacks which use the time required for
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156 * signing to guess the private key. Blinding avoids this attack, though makes
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157 * signing operations slightly slower. */
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158 #define DROPBEAR_RSA_BLINDING 1
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159
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160 #ifndef DROPBEAR_RSA_SHA1
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161 #define DROPBEAR_RSA_SHA1 DROPBEAR_RSA
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162 #endif
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163 #ifndef DROPBEAR_RSA_SHA256
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164 #define DROPBEAR_RSA_SHA256 DROPBEAR_RSA
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165 #endif
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166
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167 /* hashes which will be linked and registered */
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168 #define DROPBEAR_SHA256 ((DROPBEAR_SHA2_256_HMAC) || (DROPBEAR_ECC_256) \
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169 || (DROPBEAR_CURVE25519) || (DROPBEAR_DH_GROUP14_SHA256) \
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170 || (DROPBEAR_RSA_SHA256))
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171 #define DROPBEAR_SHA384 (DROPBEAR_ECC_384)
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172 /* LTC SHA384 depends on SHA512 */
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173 #define DROPBEAR_SHA512 ((DROPBEAR_SHA2_512_HMAC) || (DROPBEAR_ECC_521) \
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174 || (DROPBEAR_SHA384) || (DROPBEAR_DH_GROUP16) \
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175 || (DROPBEAR_ED25519))
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176 #define DROPBEAR_MD5 (DROPBEAR_MD5_HMAC)
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177
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178 #define DROPBEAR_DH_GROUP14 ((DROPBEAR_DH_GROUP14_SHA256) || (DROPBEAR_DH_GROUP14_SHA1))
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179
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180 #define DROPBEAR_NORMAL_DH ((DROPBEAR_DH_GROUP1) || (DROPBEAR_DH_GROUP14) || (DROPBEAR_DH_GROUP16))
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181
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182 /* Dropbear only uses server-sig-algs, only needed if we have rsa-sha256 pubkey auth */
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183 #define DROPBEAR_EXT_INFO ((DROPBEAR_RSA_SHA256) \
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184 && ((DROPBEAR_CLI_PUBKEY_AUTH) || (DROPBEAR_SVR_PUBKEY_AUTH)))
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185
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186 /* roughly 2x 521 bits */
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187 #define MAX_ECC_SIZE 140
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188
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189 #define MAX_NAME_LEN 64 /* maximum length of a protocol name, isn't
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190 explicitly specified for all protocols (just
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191 for algos) but seems valid */
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192
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193 #define MAX_PROPOSED_ALGO 50
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194
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195 /* size/count limits */
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196 /* From transport rfc */
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197 #define MIN_PACKET_LEN 16
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198
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199 #define RECV_MAX_PACKET_LEN (MAX(35000, ((RECV_MAX_PAYLOAD_LEN)+100)))
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200
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201 /* for channel code */
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202 #define TRANS_MAX_WINDOW 500000000 /* 500MB is sufficient, stopping overflow */
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203 #define TRANS_MAX_WIN_INCR 500000000 /* overflow prevention */
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204
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205 #define RECV_WINDOWEXTEND (opts.recv_window / 3) /* We send a "window extend" every
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206 RECV_WINDOWEXTEND bytes */
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207 #define MAX_RECV_WINDOW (10*1024*1024) /* 10 MB should be enough */
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208
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209 #define MAX_CHANNELS 1000 /* simple mem restriction, includes each tcp/x11
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210 connection, so can't be _too_ small */
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211
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212 #define MAX_STRING_LEN (MAX(MAX_CMD_LEN, 2400)) /* Sun SSH needs 2400 for algos,
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213 MAX_CMD_LEN is usually longer */
499
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214
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215 /* For a 4096 bit DSS key, empirically determined */
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216 #define MAX_PUBKEY_SIZE 1700
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217 /* For a 4096 bit DSS key, empirically determined */
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218 #define MAX_PRIVKEY_SIZE 1700
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219
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220 #define MAX_HOSTKEYS 4
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221
499
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222 /* The maximum size of the bignum portion of the kexhash buffer */
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223 /* Sect. 8 of the transport rfc 4253, K_S + e + f + K */
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224 #define KEXHASHBUF_MAX_INTS (1700 + 130 + 130 + 130)
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225
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226 #define DROPBEAR_MAX_SOCKS 2 /* IPv4, IPv6 are all we'll get for now. Revisit
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227 in a few years time.... */
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228
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229 #define DROPBEAR_MAX_CLI_PASS 1024
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230
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231 #define DROPBEAR_MAX_CLI_INTERACT_PROMPTS 80 /* The number of prompts we'll
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232 accept for keyb-interactive
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233 auth */
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234
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235
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236 #define DROPBEAR_AES ((DROPBEAR_AES256) || (DROPBEAR_AES128))
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237
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238 #define DROPBEAR_TWOFISH ((DROPBEAR_TWOFISH256) || (DROPBEAR_TWOFISH128))
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239
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240 #define DROPBEAR_AEAD_MODE ((DROPBEAR_CHACHA20POLY1305) || (DROPBEAR_ENABLE_GCM_MODE))
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diff changeset
241
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242 #define DROPBEAR_CLI_ANYTCPFWD ((DROPBEAR_CLI_REMOTETCPFWD) || (DROPBEAR_CLI_LOCALTCPFWD))
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243
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244 #define DROPBEAR_TCP_ACCEPT ((DROPBEAR_CLI_LOCALTCPFWD) || (DROPBEAR_SVR_REMOTETCPFWD))
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245
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246 #define DROPBEAR_LISTENERS \
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247 ((DROPBEAR_CLI_REMOTETCPFWD) || (DROPBEAR_CLI_LOCALTCPFWD) || \
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248 (DROPBEAR_SVR_REMOTETCPFWD) || (DROPBEAR_SVR_LOCALTCPFWD) || \
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249 (DROPBEAR_SVR_AGENTFWD) || (DROPBEAR_X11FWD))
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250
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251 #define DROPBEAR_CLI_MULTIHOP ((DROPBEAR_CLI_NETCAT) && (DROPBEAR_CLI_PROXYCMD))
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252
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253 #define ENABLE_CONNECT_UNIX ((DROPBEAR_CLI_AGENTFWD) || (DROPBEAR_USE_PRNGD))
547
cf376c696dfc Make it compile, update for changes in channel structure.
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254
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255 /* if we're using authorized_keys or known_hosts */
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256 #define DROPBEAR_KEY_LINES ((DROPBEAR_CLIENT) || (DROPBEAR_SVR_PUBKEY_AUTH))
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257
605
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258 /* Changing this is inadvisable, it appears to have problems
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259 * with flushing compressed data */
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260 #define DROPBEAR_ZLIB_MEM_LEVEL 8
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261
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262 #if (DROPBEAR_SVR_PASSWORD_AUTH) && (DROPBEAR_SVR_PAM_AUTH)
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263 #error "You can't turn on PASSWORD and PAM auth both at once. Fix it in localoptions.h"
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264 #endif
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265
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266 /* PAM requires ./configure --enable-pam */
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267 #if !defined(HAVE_LIBPAM) && DROPBEAR_SVR_PAM_AUTH
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268 #error "DROPBEAR_SVR_PATM_AUTH requires PAM headers. Perhaps ./configure --enable-pam ?"
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269 #endif
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270
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271 #if DROPBEAR_SVR_PASSWORD_AUTH && !HAVE_CRYPT
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272 #error "DROPBEAR_SVR_PASSWORD_AUTH requires `crypt()'."
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273 #endif
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274
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275 #if !(DROPBEAR_SVR_PASSWORD_AUTH || DROPBEAR_SVR_PAM_AUTH || DROPBEAR_SVR_PUBKEY_AUTH)
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276 #error "At least one server authentication type must be enabled. DROPBEAR_SVR_PUBKEY_AUTH and DROPBEAR_SVR_PASSWORD_AUTH are recommended."
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277 #endif
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278
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279 #if (DROPBEAR_PLUGIN && !DROPBEAR_SVR_PUBKEY_AUTH)
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280 #error "You must define DROPBEAR_SVR_PUBKEY_AUTH in order to use plugins"
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281 #endif
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282
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283 #if !(DROPBEAR_AES128 || DROPBEAR_3DES || DROPBEAR_AES256 || DROPBEAR_BLOWFISH \
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284 || DROPBEAR_TWOFISH256 || DROPBEAR_TWOFISH128 || DROPBEAR_CHACHA20POLY1305)
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285 #error "At least one encryption algorithm must be enabled. AES128 is recommended."
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286 #endif
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287
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288 #if !(DROPBEAR_RSA || DROPBEAR_DSS || DROPBEAR_ECDSA || DROPBEAR_ED25519)
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289 #error "At least one hostkey or public-key algorithm must be enabled; RSA is recommended."
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290 #endif
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291
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292 /* Source for randomness. This must be able to provide hundreds of bytes per SSH
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293 * connection without blocking. */
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294 #ifndef DROPBEAR_URANDOM_DEV
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295 #define DROPBEAR_URANDOM_DEV "/dev/urandom"
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296 #endif
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297
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298 /* client keyboard interactive authentication is often used for password auth.
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299 rfc4256 */
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300 #define DROPBEAR_CLI_INTERACT_AUTH (DROPBEAR_CLI_PASSWORD_AUTH)
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301
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302 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
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303 * code, if we're just compiling as client or server */
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304 #if (DROPBEAR_SERVER) && (DROPBEAR_CLIENT)
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305
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306 #define IS_DROPBEAR_SERVER (ses.isserver == 1)
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307 #define IS_DROPBEAR_CLIENT (ses.isserver == 0)
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308
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309 #elif DROPBEAR_SERVER
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310
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311 #define IS_DROPBEAR_SERVER 1
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312 #define IS_DROPBEAR_CLIENT 0
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313
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314 #elif DROPBEAR_CLIENT
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315
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316 #define IS_DROPBEAR_SERVER 0
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317 #define IS_DROPBEAR_CLIENT 1
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318
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319 #else
521
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320 /* Just building key utils? */
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321 #define IS_DROPBEAR_SERVER 0
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322 #define IS_DROPBEAR_CLIENT 0
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323
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324 #endif /* neither DROPBEAR_SERVER nor DROPBEAR_CLIENT */
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325
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326 #ifdef HAVE_FORK
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327 #define DROPBEAR_VFORK 0
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328 #else
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329 #define DROPBEAR_VFORK 1
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330 #endif
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331
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332 #ifndef DROPBEAR_LISTEN_BACKLOG
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333 #if MAX_UNAUTH_CLIENTS > MAX_CHANNELS
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334 #define DROPBEAR_LISTEN_BACKLOG MAX_UNAUTH_CLIENTS
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335 #else
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336 #define DROPBEAR_LISTEN_BACKLOG MAX_CHANNELS
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337 #endif
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338 #endif
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339
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340 /* free memory before exiting */
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341 #define DROPBEAR_CLEANUP 1
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342
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343 /* Use this string since some implementations might special-case it */
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344 #define DROPBEAR_KEEPALIVE_STRING "[email protected]"
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345
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346 /* Linux will attempt TCP fast open, falling back if not supported by the kernel.
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347 * Currently server is enabled but client is disabled by default until there
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348 * is further compatibility testing */
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349 #ifdef __linux__
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350 #define DROPBEAR_SERVER_TCP_FAST_OPEN 1
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351 #define DROPBEAR_CLIENT_TCP_FAST_OPEN 0
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diff changeset
352 #else
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353 #define DROPBEAR_SERVER_TCP_FAST_OPEN 0
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354 #define DROPBEAR_CLIENT_TCP_FAST_OPEN 0
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355 #endif
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356
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357 #define DROPBEAR_TRACKING_MALLOC (DROPBEAR_FUZZ)
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358
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359 /* Used to work around Memory Sanitizer false positives */
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diff changeset
360 #if defined(__has_feature)
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361 # if __has_feature(memory_sanitizer)
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362 # define DROPBEAR_MSAN 1
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363 # endif
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diff changeset
364 #endif
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diff changeset
365 #ifndef DROPBEAR_MSAN
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366 #define DROPBEAR_MSAN 0
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367 #endif
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368
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diff changeset
369
667
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370 /* no include guard for this file */