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annotate common-algo.c @ 275:7f9adaf85fca

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Exit with a message if the ssh protocol version is incompatible
author Matt Johnston <matt@ucc.asn.au>
date Sat, 04 Mar 2006 08:22:16 +0000
parents 89ace56293f6
children 64abb124763d 0e69e948caba
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * Copyright (c) 2004 by Mihnea Stoenescu
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6 * All rights reserved.
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7 *
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy
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9 * of this software and associated documentation files (the "Software"), to deal
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10 * in the Software without restriction, including without limitation the rights
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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12 * copies of the Software, and to permit persons to whom the Software is
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13 * furnished to do so, subject to the following conditions:
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14 *
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15 * The above copyright notice and this permission notice shall be included in
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16 * all copies or substantial portions of the Software.
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17 *
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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24 * SOFTWARE. */
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25
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26 #include "algo.h"
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27 #include "dbutil.h"
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28
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29 /* This file (algo.c) organises the ciphers which can be used, and is used to
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30 * decide which ciphers/hashes/compression/signing to use during key exchange*/
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32 /* Mappings for ciphers, parameters are
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33 {&cipher_desc, keysize, blocksize} */
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34
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35 #ifdef DROPBEAR_AES256_CBC
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36 static const struct dropbear_cipher dropbear_aes256 =
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37 {&aes_desc, 32, 16};
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38 #endif
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39 #ifdef DROPBEAR_AES128_CBC
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40 static const struct dropbear_cipher dropbear_aes128 =
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41 {&aes_desc, 16, 16};
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42 #endif
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43 #ifdef DROPBEAR_BLOWFISH_CBC
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44 static const struct dropbear_cipher dropbear_blowfish =
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45 {&blowfish_desc, 16, 8};
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46 #endif
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47 #ifdef DROPBEAR_TWOFISH256_CBC
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48 static const struct dropbear_cipher dropbear_twofish256 =
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49 {&twofish_desc, 32, 16};
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50 #endif
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51 #ifdef DROPBEAR_TWOFISH128_CBC
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52 static const struct dropbear_cipher dropbear_twofish128 =
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53 {&twofish_desc, 16, 16};
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54 #endif
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55 #ifdef DROPBEAR_3DES_CBC
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56 static const struct dropbear_cipher dropbear_3des =
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57 {&des3_desc, 24, 8};
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58 #endif
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59
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60 /* used to indicate no encryption, as defined in rfc2410 */
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61 const struct dropbear_cipher dropbear_nocipher =
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62 {NULL, 16, 8};
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63
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64 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc.
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65 {&hash_desc, keysize, hashsize} */
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67 #ifdef DROPBEAR_SHA1_HMAC
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68 static const struct dropbear_hash dropbear_sha1 =
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69 {&sha1_desc, 20, 20};
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70 #endif
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71 #ifdef DROPBEAR_SHA1_96_HMAC
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72 static const struct dropbear_hash dropbear_sha1_96 =
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73 {&sha1_desc, 20, 12};
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74 #endif
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75 #ifdef DROPBEAR_MD5_HMAC
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76 static const struct dropbear_hash dropbear_md5 =
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77 {&md5_desc, 16, 16};
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78 #endif
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80 const struct dropbear_hash dropbear_nohash =
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81 {NULL, 16, 0}; /* used initially */
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84 /* The following map ssh names to internal values */
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85
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86 algo_type sshciphers[] = {
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87 #ifdef DROPBEAR_AES128_CBC
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88 {"aes128-cbc", 0, (void*)&dropbear_aes128, 1},
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89 #endif
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90 #ifdef DROPBEAR_3DES_CBC
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91 {"3des-cbc", 0, (void*)&dropbear_3des, 1},
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92 #endif
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93 #ifdef DROPBEAR_AES256_CBC
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94 {"aes256-cbc", 0, (void*)&dropbear_aes256, 1},
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95 #endif
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96 #ifdef DROPBEAR_TWOFISH256_CBC
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97 {"twofish256-cbc", 0, (void*)&dropbear_twofish256, 1},
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98 {"twofish-cbc", 0, (void*)&dropbear_twofish256, 1},
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99 #endif
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100 #ifdef DROPBEAR_TWOFISH128_CBC
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101 {"twofish128-cbc", 0, (void*)&dropbear_twofish128, 1},
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102 #endif
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103 #ifdef DROPBEAR_BLOWFISH_CBC
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104 {"blowfish-cbc", 0, (void*)&dropbear_blowfish, 1},
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105 #endif
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106 {NULL, 0, NULL, 0}
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107 };
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108
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109 algo_type sshhashes[] = {
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110 #ifdef DROPBEAR_SHA1_96_HMAC
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111 {"hmac-sha1-96", 0, (void*)&dropbear_sha1_96, 1},
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112 #endif
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113 #ifdef DROPBEAR_SHA1_HMAC
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114 {"hmac-sha1", 0, (void*)&dropbear_sha1, 1},
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115 #endif
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116 #ifdef DROPBEAR_MD5_HMAC
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117 {"hmac-md5", 0, (void*)&dropbear_md5, 1},
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118 #endif
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119 {NULL, 0, NULL, 0}
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120 };
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121
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122 algo_type sshcompress[] = {
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123 #ifndef DISABLE_ZLIB
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124 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1},
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125 #endif
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126 {"none", DROPBEAR_COMP_NONE, NULL, 1},
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127 {NULL, 0, NULL, 0}
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128 };
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129
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130 algo_type sshhostkey[] = {
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131 #ifdef DROPBEAR_RSA
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132 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1},
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133 #endif
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134 #ifdef DROPBEAR_DSS
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135 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1},
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136 #endif
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137 {NULL, 0, NULL, 0}
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138 };
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139
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140 algo_type sshkex[] = {
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141 {"diffie-hellman-group1-sha1", DROPBEAR_KEX_DH_GROUP1, NULL, 1},
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142 {NULL, 0, NULL, 0}
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143 };
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144
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145
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146 /* Register the compiled in ciphers.
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147 * This should be run before using any of the ciphers/hashes */
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148 void crypto_init() {
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149
194
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150 const struct ltc_cipher_descriptor *regciphers[] = {
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151 #ifdef DROPBEAR_AES_CBC
150
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152 &aes_desc,
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153 #endif
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154 #ifdef DROPBEAR_BLOWFISH_CBC
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155 &blowfish_desc,
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156 #endif
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157 #ifdef DROPBEAR_TWOFISH_CBC
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158 &twofish_desc,
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159 #endif
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160 #ifdef DROPBEAR_3DES_CBC
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161 &des3_desc,
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162 #endif
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163 NULL
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164 };
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165
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166 const struct ltc_hash_descriptor *reghashes[] = {
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167 /* we need sha1 for hostkey stuff regardless */
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168 &sha1_desc,
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169 #ifdef DROPBEAR_MD5_HMAC
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170 &md5_desc,
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171 #endif
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172 NULL
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173 };
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174 int i;
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175
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176 for (i = 0; regciphers[i] != NULL; i++) {
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177 if (register_cipher(regciphers[i]) == -1) {
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178 dropbear_exit("error registering crypto");
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179 }
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180 }
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181
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182 for (i = 0; reghashes[i] != NULL; i++) {
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183 if (register_hash(reghashes[i]) == -1) {
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184 dropbear_exit("error registering crypto");
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185 }
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186 }
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187 }
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188
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189 /* algolen specifies the length of algo, algos is our local list to match
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190 * against.
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191 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
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192 * otherwise */
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193 int have_algo(char* algo, size_t algolen, algo_type algos[]) {
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194
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195 int i;
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196
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197 for (i = 0; algos[i].name != NULL; i++) {
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198 if (strlen(algos[i].name) == algolen
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199 && (strncmp(algos[i].name, algo, algolen) == 0)) {
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200 return DROPBEAR_SUCCESS;
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201 }
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202 }
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203
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204 return DROPBEAR_FAILURE;
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205 }
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206
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207
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208
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209 /* Output a comma separated list of algorithms to a buffer */
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210 void buf_put_algolist(buffer * buf, algo_type localalgos[]) {
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211
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212 unsigned int i, len;
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213 unsigned int donefirst = 0;
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214 buffer *algolist = NULL;
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215
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216 algolist = buf_new(100);
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217 for (i = 0; localalgos[i].name != NULL; i++) {
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218 if (localalgos[i].usable) {
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219 if (donefirst)
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220 buf_putbyte(algolist, ',');
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221 donefirst = 1;
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222 len = strlen(localalgos[i].name);
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223 buf_putbytes(algolist, localalgos[i].name, len);
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224 }
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225 }
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226 buf_putstring(buf, algolist->data, algolist->len);
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227 buf_free(algolist);
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228 }