annotate sysoptions.h @ 1853:2be3115a8762 default tip main master

debugging test runner authorized_keys perms
author Matt Johnston <matt@ucc.asn.au>
date Tue, 19 Oct 2021 13:45:59 +0800
parents 94dc11094e26
children
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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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31
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32 /* A client should try and send an initial key exchange packet guessing
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33 * the algorithm that will match - saves a round trip connecting, has little
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34 * overhead if the guess was "wrong". */
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35 #ifndef DROPBEAR_KEX_FIRST_FOLLOWS
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36 #define DROPBEAR_KEX_FIRST_FOLLOWS 1
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37 #endif
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38 /* Use protocol extension to allow "first follows" to succeed more frequently.
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39 * This is currently Dropbear-specific but will gracefully fallback when connecting
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40 * to other implementations. */
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41 #ifndef DROPBEAR_KEXGUESS2
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42 #define DROPBEAR_KEXGUESS2 1
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43 #endif
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45 /* Minimum key sizes for DSS and RSA */
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46 #ifndef MIN_DSS_KEYLEN
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47 #define MIN_DSS_KEYLEN 1024
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48 #endif
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49 #ifndef MIN_RSA_KEYLEN
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50 #define MIN_RSA_KEYLEN 1024
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51 #endif
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52
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53 #define MAX_BANNER_SIZE 2050 /* this is 25*80 chars, any more is foolish */
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54 #define MAX_BANNER_LINES 20 /* How many lines the client will display */
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55
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56 /* the number of NAME=VALUE pairs to malloc for environ, if we don't have
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57 * the clearenv() function */
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58 #define ENV_SIZE 100
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59
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60 #define MAX_CMD_LEN 9000 /* max length of a command */
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61 #define MAX_TERM_LEN 200 /* max length of TERM name */
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62
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63 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
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64 #define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
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65
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66 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
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67 ipv4 and ipv6 don't count twice */
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68
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69 /* Each port might have at least a v4 and a v6 address */
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70 #define MAX_LISTEN_ADDR (DROPBEAR_MAX_PORTS*3)
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71
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72 #define _PATH_TTY "/dev/tty"
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73
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74 #define _PATH_CP "/bin/cp"
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75
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76 #define DROPBEAR_ESCAPE_CHAR '~'
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77
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78 /* success/failure defines */
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79 #define DROPBEAR_SUCCESS 0
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80 #define DROPBEAR_FAILURE -1
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81
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82 #define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
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83
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84 #define DROPBEAR_NGROUP_MAX 1024
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85
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86 /* Required for pubkey auth */
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87 #define DROPBEAR_SIGNKEY_VERIFY ((DROPBEAR_SVR_PUBKEY_AUTH) || (DROPBEAR_CLIENT))
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88
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89 /* crypt(password) must take less time than the auth failure delay
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90 (250ms set in svr-auth.c). On Linux the delay depends on
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91 password length, 100 characters here was empirically derived.
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92
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93 If a longer password is allowed Dropbear cannot compensate
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94 for the crypt time which will expose which usernames exist */
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95 #define DROPBEAR_MAX_PASSWORD_LEN 100
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96
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97 #define SHA1_HASH_SIZE 20
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98 #define MD5_HASH_SIZE 16
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99 #define MAX_HASH_SIZE 64 /* sha512 */
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100
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101 #if DROPBEAR_CHACHA20POLY1305
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102 #define MAX_KEY_LEN 64 /* 2 x 256 bits for chacha20 */
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103 #else
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104 #define MAX_KEY_LEN 32 /* 256 bits for aes256 etc */
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105 #endif
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106 #define MAX_IV_LEN 20 /* must be same as max blocksize, */
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107
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108 #if DROPBEAR_SHA2_512_HMAC
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109 #define MAX_MAC_LEN 64
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110 #elif DROPBEAR_SHA2_256_HMAC
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111 #define MAX_MAC_LEN 32
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112 #else
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113 #define MAX_MAC_LEN 20
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114 #endif
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115
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116 /* sha2-512 is not necessary unless unforseen problems arise with sha2-256 */
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117 #ifndef DROPBEAR_SHA2_512_HMAC
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118 #define DROPBEAR_SHA2_512_HMAC 0
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119 #endif
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120
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121 /* might be needed for compatibility with very old implementations */
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122 #ifndef DROPBEAR_MD5_HMAC
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123 #define DROPBEAR_MD5_HMAC 0
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124 #endif
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125
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126 /* Twofish counter mode is disabled by default because it
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127 has not been tested for interoperability with other SSH implementations.
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128 If you test it please contact the Dropbear author */
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129 #ifndef DROPBEAR_TWOFISH_CTR
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130 #define DROPBEAR_TWOFISH_CTR 0
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131 #endif
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132
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133
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134 #define DROPBEAR_ECC ((DROPBEAR_ECDH) || (DROPBEAR_ECDSA))
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135
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136 /* Debian doesn't define this in system headers */
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137 #if !defined(LTM_DESC) && (DROPBEAR_ECC)
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138 #define LTM_DESC
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139 #endif
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140
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141 #define DROPBEAR_ECC_256 (DROPBEAR_ECC)
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142 #define DROPBEAR_ECC_384 (DROPBEAR_ECC)
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143 #define DROPBEAR_ECC_521 (DROPBEAR_ECC)
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144
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145 #define DROPBEAR_LTC_PRNG (DROPBEAR_ECC)
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146
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147 /* RSA can be vulnerable to timing attacks which use the time required for
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148 * signing to guess the private key. Blinding avoids this attack, though makes
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149 * signing operations slightly slower. */
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150 #define DROPBEAR_RSA_BLINDING 1
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151
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152 #ifndef DROPBEAR_RSA_SHA1
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153 #define DROPBEAR_RSA_SHA1 DROPBEAR_RSA
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154 #endif
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155 #ifndef DROPBEAR_RSA_SHA256
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156 #define DROPBEAR_RSA_SHA256 DROPBEAR_RSA
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157 #endif
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158
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159 /* hashes which will be linked and registered */
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160 #define DROPBEAR_SHA256 ((DROPBEAR_SHA2_256_HMAC) || (DROPBEAR_ECC_256) \
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161 || (DROPBEAR_CURVE25519) || (DROPBEAR_DH_GROUP14_SHA256) \
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162 || (DROPBEAR_RSA_SHA256))
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163 #define DROPBEAR_SHA384 (DROPBEAR_ECC_384)
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164 /* LTC SHA384 depends on SHA512 */
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165 #define DROPBEAR_SHA512 ((DROPBEAR_SHA2_512_HMAC) || (DROPBEAR_ECC_521) \
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166 || (DROPBEAR_SHA384) || (DROPBEAR_DH_GROUP16) \
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167 || (DROPBEAR_ED25519))
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168 #define DROPBEAR_MD5 (DROPBEAR_MD5_HMAC)
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169
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170 #define DROPBEAR_DH_GROUP14 ((DROPBEAR_DH_GROUP14_SHA256) || (DROPBEAR_DH_GROUP14_SHA1))
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171
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172 #define DROPBEAR_NORMAL_DH ((DROPBEAR_DH_GROUP1) || (DROPBEAR_DH_GROUP14) || (DROPBEAR_DH_GROUP16))
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173
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174 /* Dropbear only uses server-sig-algs, only needed if we have rsa-sha256 pubkey auth */
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175 #define DROPBEAR_EXT_INFO ((DROPBEAR_RSA_SHA256) \
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176 && ((DROPBEAR_CLI_PUBKEY_AUTH) || (DROPBEAR_SVR_PUBKEY_AUTH)))
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177
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178 /* roughly 2x 521 bits */
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179 #define MAX_ECC_SIZE 140
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180
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181 #define MAX_NAME_LEN 64 /* maximum length of a protocol name, isn't
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182 explicitly specified for all protocols (just
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183 for algos) but seems valid */
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184
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185 #define MAX_PROPOSED_ALGO 50
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186
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187 /* size/count limits */
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188 /* From transport rfc */
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189 #define MIN_PACKET_LEN 16
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190
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191 #define RECV_MAX_PACKET_LEN (MAX(35000, ((RECV_MAX_PAYLOAD_LEN)+100)))
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192
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193 /* for channel code */
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194 #define TRANS_MAX_WINDOW 500000000 /* 500MB is sufficient, stopping overflow */
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195 #define TRANS_MAX_WIN_INCR 500000000 /* overflow prevention */
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196
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197 #define RECV_WINDOWEXTEND (opts.recv_window / 3) /* We send a "window extend" every
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198 RECV_WINDOWEXTEND bytes */
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199 #define MAX_RECV_WINDOW (10*1024*1024) /* 10 MB should be enough */
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200
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201 #define MAX_CHANNELS 1000 /* simple mem restriction, includes each tcp/x11
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202 connection, so can't be _too_ small */
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203
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204 #define MAX_STRING_LEN (MAX(MAX_CMD_LEN, 2400)) /* Sun SSH needs 2400 for algos,
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205 MAX_CMD_LEN is usually longer */
499
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206
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207 /* For a 4096 bit DSS key, empirically determined */
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208 #define MAX_PUBKEY_SIZE 1700
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209 /* For a 4096 bit DSS key, empirically determined */
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210 #define MAX_PRIVKEY_SIZE 1700
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211
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212 #define MAX_HOSTKEYS 4
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7f604f9b3756 ecdsa is working
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213
499
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214 /* The maximum size of the bignum portion of the kexhash buffer */
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215 /* Sect. 8 of the transport rfc 4253, K_S + e + f + K */
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216 #define KEXHASHBUF_MAX_INTS (1700 + 130 + 130 + 130)
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217
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218 #define DROPBEAR_MAX_SOCKS 2 /* IPv4, IPv6 are all we'll get for now. Revisit
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219 in a few years time.... */
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220
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221 #define DROPBEAR_MAX_CLI_PASS 1024
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222
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223 #define DROPBEAR_MAX_CLI_INTERACT_PROMPTS 80 /* The number of prompts we'll
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224 accept for keyb-interactive
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225 auth */
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226
883
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
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227
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228 #define DROPBEAR_AES ((DROPBEAR_AES256) || (DROPBEAR_AES128))
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229
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230 #define DROPBEAR_TWOFISH ((DROPBEAR_TWOFISH256) || (DROPBEAR_TWOFISH128))
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231
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parents: 1659
diff changeset
232 #define DROPBEAR_AEAD_MODE ((DROPBEAR_CHACHA20POLY1305) || (DROPBEAR_ENABLE_GCM_MODE))
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233
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234 #define DROPBEAR_CLI_ANYTCPFWD ((DROPBEAR_CLI_REMOTETCPFWD) || (DROPBEAR_CLI_LOCALTCPFWD))
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235
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236 #define DROPBEAR_TCP_ACCEPT ((DROPBEAR_CLI_LOCALTCPFWD) || (DROPBEAR_SVR_REMOTETCPFWD))
499
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237
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diff changeset
238 #define DROPBEAR_LISTENERS \
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diff changeset
239 ((DROPBEAR_CLI_REMOTETCPFWD) || (DROPBEAR_CLI_LOCALTCPFWD) || \
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240 (DROPBEAR_SVR_REMOTETCPFWD) || (DROPBEAR_SVR_LOCALTCPFWD) || \
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diff changeset
241 (DROPBEAR_SVR_AGENTFWD) || (DROPBEAR_X11FWD))
499
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242
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243 #define DROPBEAR_CLI_MULTIHOP ((DROPBEAR_CLI_NETCAT) && (DROPBEAR_CLI_PROXYCMD))
499
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244
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parents: 1477
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245 #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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diff changeset
246
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247 /* if we're using authorized_keys or known_hosts */
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248 #define DROPBEAR_KEY_LINES ((DROPBEAR_CLIENT) || (DROPBEAR_SVR_PUBKEY_AUTH))
499
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249
605
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diff changeset
250 /* Changing this is inadvisable, it appears to have problems
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parents: 598
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251 * with flushing compressed data */
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diff changeset
252 #define DROPBEAR_ZLIB_MEM_LEVEL 8
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253
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254 #if (DROPBEAR_SVR_PASSWORD_AUTH) && (DROPBEAR_SVR_PAM_AUTH)
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255 #error "You can't turn on PASSWORD and PAM auth both at once. Fix it in localoptions.h"
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256 #endif
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257
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258 /* PAM requires ./configure --enable-pam */
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259 #if !defined(HAVE_LIBPAM) && DROPBEAR_SVR_PAM_AUTH
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260 #error "DROPBEAR_SVR_PATM_AUTH requires PAM headers. Perhaps ./configure --enable-pam ?"
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261 #endif
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262
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263 #if DROPBEAR_SVR_PASSWORD_AUTH && !HAVE_CRYPT
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264 #error "DROPBEAR_SVR_PASSWORD_AUTH requires `crypt()'."
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265 #endif
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266
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267 #if !(DROPBEAR_SVR_PASSWORD_AUTH || DROPBEAR_SVR_PAM_AUTH || DROPBEAR_SVR_PUBKEY_AUTH)
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268 #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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269 #endif
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270
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271 #if (DROPBEAR_PLUGIN && !DROPBEAR_SVR_PUBKEY_AUTH)
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272 #error "You must define DROPBEAR_SVR_PUBKEY_AUTH in order to use plugins"
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273 #endif
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274
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275 #if !(DROPBEAR_AES128 || DROPBEAR_3DES || DROPBEAR_AES256 || DROPBEAR_BLOWFISH \
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276 || DROPBEAR_TWOFISH256 || DROPBEAR_TWOFISH128 || DROPBEAR_CHACHA20POLY1305)
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277 #error "At least one encryption algorithm must be enabled. AES128 is recommended."
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278 #endif
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279
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280 #if !(DROPBEAR_RSA || DROPBEAR_DSS || DROPBEAR_ECDSA || DROPBEAR_ED25519)
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281 #error "At least one hostkey or public-key algorithm must be enabled; RSA is recommended."
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282 #endif
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283
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284 /* Source for randomness. This must be able to provide hundreds of bytes per SSH
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285 * connection without blocking. */
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286 #ifndef DROPBEAR_URANDOM_DEV
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287 #define DROPBEAR_URANDOM_DEV "/dev/urandom"
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288 #endif
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289
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290 /* client keyboard interactive authentication is often used for password auth.
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291 rfc4256 */
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292 #define DROPBEAR_CLI_INTERACT_AUTH (DROPBEAR_CLI_PASSWORD_AUTH)
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293
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294 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
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295 * code, if we're just compiling as client or server */
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296 #if (DROPBEAR_SERVER) && (DROPBEAR_CLIENT)
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297
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298 #define IS_DROPBEAR_SERVER (ses.isserver == 1)
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299 #define IS_DROPBEAR_CLIENT (ses.isserver == 0)
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300
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301 #elif DROPBEAR_SERVER
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302
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303 #define IS_DROPBEAR_SERVER 1
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304 #define IS_DROPBEAR_CLIENT 0
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305
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306 #elif DROPBEAR_CLIENT
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307
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308 #define IS_DROPBEAR_SERVER 0
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309 #define IS_DROPBEAR_CLIENT 1
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310
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311 #else
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312 /* Just building key utils? */
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313 #define IS_DROPBEAR_SERVER 0
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314 #define IS_DROPBEAR_CLIENT 0
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315
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316 #endif /* neither DROPBEAR_SERVER nor DROPBEAR_CLIENT */
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317
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318 #ifdef HAVE_FORK
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319 #define DROPBEAR_VFORK 0
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320 #else
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321 #define DROPBEAR_VFORK 1
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322 #endif
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323
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324 #ifndef DROPBEAR_LISTEN_BACKLOG
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325 #if MAX_UNAUTH_CLIENTS > MAX_CHANNELS
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326 #define DROPBEAR_LISTEN_BACKLOG MAX_UNAUTH_CLIENTS
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327 #else
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328 #define DROPBEAR_LISTEN_BACKLOG MAX_CHANNELS
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329 #endif
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330 #endif
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331
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332 /* free memory before exiting */
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333 #define DROPBEAR_CLEANUP 1
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334
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335 /* Use this string since some implementations might special-case it */
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336 #define DROPBEAR_KEEPALIVE_STRING "[email protected]"
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337
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338 /* Linux will attempt TCP fast open, falling back if not supported by the kernel.
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339 * Currently server is enabled but client is disabled by default until there
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340 * is further compatibility testing */
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341 #ifdef __linux__
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342 #define DROPBEAR_SERVER_TCP_FAST_OPEN 1
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343 #define DROPBEAR_CLIENT_TCP_FAST_OPEN 0
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344 #else
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345 #define DROPBEAR_SERVER_TCP_FAST_OPEN 0
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346 #define DROPBEAR_CLIENT_TCP_FAST_OPEN 0
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347 #endif
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348
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349 #define DROPBEAR_TRACKING_MALLOC (DROPBEAR_FUZZ)
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350
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351 /* Used to work around Memory Sanitizer false positives */
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352 #if defined(__has_feature)
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353 # if __has_feature(memory_sanitizer)
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354 # define DROPBEAR_MSAN 1
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355 # endif
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356 #endif
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357 #ifndef DROPBEAR_MSAN
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358 #define DROPBEAR_MSAN 0
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359 #endif
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360
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361
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362 /* no include guard for this file */