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annotate common-algo.c @ 4:fe6bca95afa7

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author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 02:46:09 +0000
parents
children e3adf4cf5465
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4
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "algo.h"
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26 #include "dbutil.h"
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27
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28 /* This file (algo.c) organises the ciphers which can be used, and is used to
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29 * decide which ciphers/hashes/compression/signing to use during key exchange*/
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30
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31 /* Mappings for ciphers, parameters are
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32 {&cipher_desc, keysize, blocksize} */
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33
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34 #ifdef DROPBEAR_AES128_CBC
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35 const struct dropbear_cipher dropbear_aes128 =
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36 {&rijndael_desc, 16, 16};
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37 #endif
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38 #ifdef DROPBEAR_BLOWFISH_CBC
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39 const struct dropbear_cipher dropbear_blowfish =
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40 {&blowfish_desc, 16, 8};
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41 #endif
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42 #ifdef DROPBEAR_TWOFISH128_CBC
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43 const struct dropbear_cipher dropbear_twofish128 =
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44 {&twofish_desc, 16, 16};
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45 #endif
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46 #ifdef DROPBEAR_3DES_CBC
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47 const struct dropbear_cipher dropbear_3des =
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48 {&des3_desc, 24, 8};
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49 #endif
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50
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51 /* used to indicate no encryption, as defined in rfc2410 */
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52 const struct dropbear_cipher dropbear_nocipher =
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53 {NULL, 16, 8};
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54
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55 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc.
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56 {&hash_desc, keysize, hashsize} */
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57
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58 #ifdef DROPBEAR_SHA1_HMAC
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59 const struct dropbear_hash dropbear_sha1 =
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60 {&sha1_desc, 20, 20};
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61 #endif
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62 #ifdef DROPBEAR_MD5_HMAC
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63 const struct dropbear_hash dropbear_md5 =
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64 {&md5_desc, 16, 16};
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65 #endif
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66
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67 const struct dropbear_hash dropbear_nohash =
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68 {NULL, 16, 0}; /* used initially */
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69
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70
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71 /* The following map ssh names to internal values */
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72
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73 algo_type sshciphers[] = {
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74 #ifdef DROPBEAR_AES128_CBC
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75 {"aes128-cbc", 0, (void*)&dropbear_aes128, 1},
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76 #endif
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77 #ifdef DROPBEAR_BLOWFISH_CBC
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78 {"blowfish-cbc", 0, (void*)&dropbear_blowfish, 1},
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79 #endif
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80 #ifdef DROPBEAR_TWOFISH128_CBC
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81 {"twofish-cbc", 0, (void*)&dropbear_twofish128, 1},
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82 #endif
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83 #ifdef DROPBEAR_3DES_CBC
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84 {"3des-cbc", 0, (void*)&dropbear_3des, 1},
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85 #endif
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86 {NULL, 0, NULL, 0}
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87 };
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88
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89 algo_type sshhashes[] = {
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90 #ifdef DROPBEAR_SHA1_HMAC
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91 {"hmac-sha1", 0, (void*)&dropbear_sha1, 1},
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92 #endif
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93 #ifdef DROPBEAR_MD5_HMAC
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94 {"hmac-md5", 0, (void*)&dropbear_md5, 1},
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95 #endif
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96 {NULL, 0, NULL, 0}
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97 };
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98
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99 algo_type sshcompress[] = {
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100 {"none", DROPBEAR_COMP_NONE, NULL, 1},
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101 #ifndef DISABLE_ZLIB
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102 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1},
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103 #endif
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104 {NULL, 0, NULL, 0}
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105 };
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106
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107 algo_type sshhostkey[] = {
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108 #ifdef DROPBEAR_RSA
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109 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1},
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110 #endif
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111 #ifdef DROPBEAR_DSS
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112 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1},
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113 #endif
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114 {NULL, 0, NULL, 0}
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115 };
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116
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117 algo_type sshkex[] = {
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118 {"diffie-hellman-group1-sha1", DROPBEAR_KEX_DH_GROUP1, NULL, 1},
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119 {NULL, 0, NULL, 0}
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120 };
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121
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122
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123 /* Register the compiled in ciphers.
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124 * This should be run before using any of the ciphers/hashes */
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125 void crypto_init() {
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126
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127 const struct _cipher_descriptor *regciphers[] = {
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128 #ifdef DROPBEAR_AES128_CBC
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129 &rijndael_desc,
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130 #endif
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131 #ifdef DROPBEAR_BLOWFISH_CBC
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132 &blowfish_desc,
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133 #endif
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134 #ifdef DROPBEAR_TWOFISH128_CBC
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135 &twofish_desc,
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136 #endif
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137 #ifdef DROPBEAR_3DES_CBC
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138 &des3_desc,
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139 #endif
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140 NULL
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141 };
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142
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143 const struct _hash_descriptor *reghashes[] = {
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144 /* we need sha1 for hostkey stuff regardless */
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145 &sha1_desc,
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146 #ifdef DROPBEAR_MD5_HMAC
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147 &md5_desc,
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148 #endif
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149 NULL
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150 };
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151 int i;
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152
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153 for (i = 0; regciphers[i] != NULL; i++) {
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154 if (register_cipher(regciphers[i]) == -1) {
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155 dropbear_exit("error registering crypto");
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156 }
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157 }
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158
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159 for (i = 0; reghashes[i] != NULL; i++) {
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160 if (register_hash(reghashes[i]) == -1) {
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161 dropbear_exit("error registering crypto");
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162 }
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163 }
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164 }
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165
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166 /* algolen specifies the length of algo, algos is our local list to match
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167 * against.
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168 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
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169 * otherwise */
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170 int have_algo(char* algo, size_t algolen, algo_type algos[]) {
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171
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172 int i;
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173
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174 for (i = 0; algos[i].name != NULL; i++) {
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175 if (strlen(algos[i].name) == algolen
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176 && (strncmp(algos[i].name, algo, algolen) == 0)) {
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177 return DROPBEAR_SUCCESS;
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178 }
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179 }
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180
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181 return DROPBEAR_FAILURE;
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182 }
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183
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184
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185
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186 /* Output a comma separated list of algorithms to a buffer */
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187 void buf_put_algolist(buffer * buf, algo_type localalgos[]) {
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188
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189 unsigned int pos = 0, i, len;
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190 char str[50]; /* enough for local algo storage */
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191
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192 for (i = 0; localalgos[i].name != NULL; i++) {
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193 if (localalgos[i].usable) {
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194 /* Avoid generating a trailing comma */
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195 if (pos)
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196 str[pos++] = ',';
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197 len = strlen(localalgos[i].name);
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198 memcpy(&str[pos], localalgos[i].name, len);
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199 pos += len;
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200 }
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201 }
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202 str[pos]=0;
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203 /* Debug this */
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204 TRACE(("buf_put_algolist: %s", str));
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205 buf_putstring(buf, str, pos);
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206 }