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annotate common-algo.c @ 224:1dbd2473482f DROPBEAR_0.46

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* ... and a bit more for the CHANGES
author Matt Johnston <matt@ucc.asn.au>
date Fri, 08 Jul 2005 19:20:10 +0000
parents e972be139cb5
children ad1b24e39bf3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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31
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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_AES128_CBC
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36 const struct dropbear_cipher dropbear_aes128 =
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37 {&aes_desc, 16, 16};
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38 #endif
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39 #ifdef DROPBEAR_BLOWFISH_CBC
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40 const struct dropbear_cipher dropbear_blowfish =
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41 {&blowfish_desc, 16, 8};
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42 #endif
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43 #ifdef DROPBEAR_TWOFISH128_CBC
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44 const struct dropbear_cipher dropbear_twofish128 =
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45 {&twofish_desc, 16, 16};
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46 #endif
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47 #ifdef DROPBEAR_3DES_CBC
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48 const struct dropbear_cipher dropbear_3des =
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49 {&des3_desc, 24, 8};
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50 #endif
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51
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52 /* used to indicate no encryption, as defined in rfc2410 */
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53 const struct dropbear_cipher dropbear_nocipher =
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54 {NULL, 16, 8};
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55
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56 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc.
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57 {&hash_desc, keysize, hashsize} */
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58
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59 #ifdef DROPBEAR_SHA1_HMAC
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60 const struct dropbear_hash dropbear_sha1 =
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61 {&sha1_desc, 20, 20};
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62 #endif
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63 #ifdef DROPBEAR_MD5_HMAC
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64 const struct dropbear_hash dropbear_md5 =
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65 {&md5_desc, 16, 16};
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66 #endif
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67
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68 const struct dropbear_hash dropbear_nohash =
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69 {NULL, 16, 0}; /* used initially */
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72 /* The following map ssh names to internal values */
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73
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74 algo_type sshciphers[] = {
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75 #ifdef DROPBEAR_AES128_CBC
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76 {"aes128-cbc", 0, (void*)&dropbear_aes128, 1},
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77 #endif
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78 #ifdef DROPBEAR_BLOWFISH_CBC
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79 {"blowfish-cbc", 0, (void*)&dropbear_blowfish, 1},
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80 #endif
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81 #ifdef DROPBEAR_TWOFISH128_CBC
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82 {"twofish-cbc", 0, (void*)&dropbear_twofish128, 1},
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83 #endif
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84 #ifdef DROPBEAR_3DES_CBC
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85 {"3des-cbc", 0, (void*)&dropbear_3des, 1},
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86 #endif
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87 {NULL, 0, NULL, 0}
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88 };
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89
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90 algo_type sshhashes[] = {
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91 #ifdef DROPBEAR_SHA1_HMAC
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92 {"hmac-sha1", 0, (void*)&dropbear_sha1, 1},
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93 #endif
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94 #ifdef DROPBEAR_MD5_HMAC
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95 {"hmac-md5", 0, (void*)&dropbear_md5, 1},
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96 #endif
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97 {NULL, 0, NULL, 0}
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98 };
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99
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100 algo_type sshcompress[] = {
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101 {"none", DROPBEAR_COMP_NONE, NULL, 1},
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102 #ifndef DISABLE_ZLIB
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103 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1},
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104 #endif
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105 {NULL, 0, NULL, 0}
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106 };
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107
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108 algo_type sshhostkey[] = {
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109 #ifdef DROPBEAR_RSA
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110 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1},
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111 #endif
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112 #ifdef DROPBEAR_DSS
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113 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1},
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114 #endif
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115 {NULL, 0, NULL, 0}
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116 };
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117
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118 algo_type sshkex[] = {
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119 {"diffie-hellman-group1-sha1", DROPBEAR_KEX_DH_GROUP1, NULL, 1},
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120 {NULL, 0, NULL, 0}
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121 };
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122
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123
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124 /* Register the compiled in ciphers.
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125 * This should be run before using any of the ciphers/hashes */
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126 void crypto_init() {
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127
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128 const struct ltc_cipher_descriptor *regciphers[] = {
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129 #ifdef DROPBEAR_AES128_CBC
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130 &aes_desc,
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131 #endif
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132 #ifdef DROPBEAR_BLOWFISH_CBC
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133 &blowfish_desc,
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134 #endif
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135 #ifdef DROPBEAR_TWOFISH128_CBC
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136 &twofish_desc,
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137 #endif
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138 #ifdef DROPBEAR_3DES_CBC
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139 &des3_desc,
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140 #endif
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141 NULL
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142 };
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143
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144 const struct ltc_hash_descriptor *reghashes[] = {
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145 /* we need sha1 for hostkey stuff regardless */
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146 &sha1_desc,
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147 #ifdef DROPBEAR_MD5_HMAC
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148 &md5_desc,
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149 #endif
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150 NULL
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151 };
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152 int i;
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153
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154 for (i = 0; regciphers[i] != NULL; i++) {
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155 if (register_cipher(regciphers[i]) == -1) {
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156 dropbear_exit("error registering crypto");
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157 }
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158 }
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159
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160 for (i = 0; reghashes[i] != NULL; i++) {
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161 if (register_hash(reghashes[i]) == -1) {
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162 dropbear_exit("error registering crypto");
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163 }
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164 }
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165 }
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166
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167 /* algolen specifies the length of algo, algos is our local list to match
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168 * against.
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169 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
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170 * otherwise */
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171 int have_algo(char* algo, size_t algolen, algo_type algos[]) {
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172
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173 int i;
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174
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175 for (i = 0; algos[i].name != NULL; i++) {
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176 if (strlen(algos[i].name) == algolen
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177 && (strncmp(algos[i].name, algo, algolen) == 0)) {
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178 return DROPBEAR_SUCCESS;
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179 }
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180 }
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181
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182 return DROPBEAR_FAILURE;
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183 }
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184
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185
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186
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187 /* Output a comma separated list of algorithms to a buffer */
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188 void buf_put_algolist(buffer * buf, algo_type localalgos[]) {
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189
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190 unsigned int pos = 0, i, len;
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191 char str[50]; /* enough for local algo storage */
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192
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193 for (i = 0; localalgos[i].name != NULL; i++) {
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194 if (localalgos[i].usable) {
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195 /* Avoid generating a trailing comma */
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196 if (pos)
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197 str[pos++] = ',';
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198 len = strlen(localalgos[i].name);
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199 memcpy(&str[pos], localalgos[i].name, len);
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200 pos += len;
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201 }
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202 }
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203 str[pos]=0;
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204 /* Debug this */
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205 TRACE(("buf_put_algolist: %s", str))
4
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206 buf_putstring(buf, str, pos);
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207 }