Mercurial > dropbear

annotate common-algo.c @ 497:ae600f1eef81

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- Enable -s for specifying a subsystem (such as sftp)
author Matt Johnston <matt@ucc.asn.au>
date Tue, 23 Sep 2008 15:57:26 +0000
parents 0e69e948caba
children d58c478bd399
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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 /* NOTE: if keysize > 2*SHA1_HASH_SIZE, code such as hashkeys()
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35 needs revisiting */
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36
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37 #ifdef DROPBEAR_AES256_CBC
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38 static const struct dropbear_cipher dropbear_aes256 =
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39 {&aes_desc, 32, 16};
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40 #endif
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41 #ifdef DROPBEAR_AES128_CBC
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42 static const struct dropbear_cipher dropbear_aes128 =
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43 {&aes_desc, 16, 16};
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44 #endif
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45 #ifdef DROPBEAR_BLOWFISH_CBC
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46 static const struct dropbear_cipher dropbear_blowfish =
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47 {&blowfish_desc, 16, 8};
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48 #endif
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49 #ifdef DROPBEAR_TWOFISH256_CBC
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50 static const struct dropbear_cipher dropbear_twofish256 =
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51 {&twofish_desc, 32, 16};
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52 #endif
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53 #ifdef DROPBEAR_TWOFISH128_CBC
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54 static const struct dropbear_cipher dropbear_twofish128 =
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55 {&twofish_desc, 16, 16};
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56 #endif
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57 #ifdef DROPBEAR_3DES_CBC
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58 static const struct dropbear_cipher dropbear_3des =
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59 {&des3_desc, 24, 8};
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60 #endif
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61
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62 /* used to indicate no encryption, as defined in rfc2410 */
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63 const struct dropbear_cipher dropbear_nocipher =
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64 {NULL, 16, 8};
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66 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc.
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67 {&hash_desc, keysize, hashsize} */
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69 #ifdef DROPBEAR_SHA1_HMAC
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70 static const struct dropbear_hash dropbear_sha1 =
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71 {&sha1_desc, 20, 20};
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72 #endif
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73 #ifdef DROPBEAR_SHA1_96_HMAC
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74 static const struct dropbear_hash dropbear_sha1_96 =
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75 {&sha1_desc, 20, 12};
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76 #endif
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77 #ifdef DROPBEAR_MD5_HMAC
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78 static const struct dropbear_hash dropbear_md5 =
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79 {&md5_desc, 16, 16};
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80 #endif
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81
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82 const struct dropbear_hash dropbear_nohash =
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83 {NULL, 16, 0}; /* used initially */
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86 /* The following map ssh names to internal values */
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87
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88 algo_type sshciphers[] = {
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89 #ifdef DROPBEAR_AES128_CBC
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90 {"aes128-cbc", 0, (void*)&dropbear_aes128, 1},
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91 #endif
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92 #ifdef DROPBEAR_3DES_CBC
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93 {"3des-cbc", 0, (void*)&dropbear_3des, 1},
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94 #endif
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95 #ifdef DROPBEAR_AES256_CBC
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96 {"aes256-cbc", 0, (void*)&dropbear_aes256, 1},
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97 #endif
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98 #ifdef DROPBEAR_TWOFISH256_CBC
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99 {"twofish256-cbc", 0, (void*)&dropbear_twofish256, 1},
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100 {"twofish-cbc", 0, (void*)&dropbear_twofish256, 1},
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101 #endif
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102 #ifdef DROPBEAR_TWOFISH128_CBC
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103 {"twofish128-cbc", 0, (void*)&dropbear_twofish128, 1},
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104 #endif
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105 #ifdef DROPBEAR_BLOWFISH_CBC
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106 {"blowfish-cbc", 0, (void*)&dropbear_blowfish, 1},
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107 #endif
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108 {NULL, 0, NULL, 0}
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109 };
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110
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111 algo_type sshhashes[] = {
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112 #ifdef DROPBEAR_SHA1_96_HMAC
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113 {"hmac-sha1-96", 0, (void*)&dropbear_sha1_96, 1},
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114 #endif
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115 #ifdef DROPBEAR_SHA1_HMAC
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116 {"hmac-sha1", 0, (void*)&dropbear_sha1, 1},
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117 #endif
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118 #ifdef DROPBEAR_MD5_HMAC
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119 {"hmac-md5", 0, (void*)&dropbear_md5, 1},
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120 #endif
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121 {NULL, 0, NULL, 0}
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122 };
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123
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124 algo_type sshcompress[] = {
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125 #ifndef DISABLE_ZLIB
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126 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1},
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127 #endif
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128 {"none", DROPBEAR_COMP_NONE, NULL, 1},
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129 {NULL, 0, NULL, 0}
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130 };
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131
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132 algo_type sshhostkey[] = {
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133 #ifdef DROPBEAR_RSA
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134 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1},
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135 #endif
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136 #ifdef DROPBEAR_DSS
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137 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1},
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138 #endif
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139 {NULL, 0, NULL, 0}
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140 };
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141
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142 algo_type sshkex[] = {
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143 {"diffie-hellman-group1-sha1", DROPBEAR_KEX_DH_GROUP1, NULL, 1},
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144 {NULL, 0, NULL, 0}
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145 };
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146
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147
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148 /* Register the compiled in ciphers.
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149 * This should be run before using any of the ciphers/hashes */
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150 void crypto_init() {
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151
194
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152 const struct ltc_cipher_descriptor *regciphers[] = {
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153 #ifdef DROPBEAR_AES_CBC
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154 &aes_desc,
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155 #endif
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156 #ifdef DROPBEAR_BLOWFISH_CBC
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157 &blowfish_desc,
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158 #endif
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159 #ifdef DROPBEAR_TWOFISH_CBC
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160 &twofish_desc,
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161 #endif
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162 #ifdef DROPBEAR_3DES_CBC
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163 &des3_desc,
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164 #endif
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165 NULL
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166 };
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167
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168 const struct ltc_hash_descriptor *reghashes[] = {
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169 /* we need sha1 for hostkey stuff regardless */
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170 &sha1_desc,
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171 #ifdef DROPBEAR_MD5_HMAC
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172 &md5_desc,
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173 #endif
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174 NULL
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175 };
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176 int i;
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177
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178 for (i = 0; regciphers[i] != NULL; i++) {
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179 if (register_cipher(regciphers[i]) == -1) {
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180 dropbear_exit("error registering crypto");
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181 }
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182 }
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183
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184 for (i = 0; reghashes[i] != NULL; i++) {
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185 if (register_hash(reghashes[i]) == -1) {
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186 dropbear_exit("error registering crypto");
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187 }
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188 }
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189 }
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190
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191 /* algolen specifies the length of algo, algos is our local list to match
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192 * against.
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193 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
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194 * otherwise */
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195 int have_algo(char* algo, size_t algolen, algo_type algos[]) {
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196
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197 int i;
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198
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199 for (i = 0; algos[i].name != NULL; i++) {
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200 if (strlen(algos[i].name) == algolen
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201 && (strncmp(algos[i].name, algo, algolen) == 0)) {
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202 return DROPBEAR_SUCCESS;
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203 }
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204 }
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205
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206 return DROPBEAR_FAILURE;
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207 }
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208
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209
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210
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211 /* Output a comma separated list of algorithms to a buffer */
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212 void buf_put_algolist(buffer * buf, algo_type localalgos[]) {
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213
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214 unsigned int i, len;
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215 unsigned int donefirst = 0;
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216 buffer *algolist = NULL;
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217
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218 algolist = buf_new(100);
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219 for (i = 0; localalgos[i].name != NULL; i++) {
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220 if (localalgos[i].usable) {
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221 if (donefirst)
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222 buf_putbyte(algolist, ',');
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223 donefirst = 1;
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224 len = strlen(localalgos[i].name);
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225 buf_putbytes(algolist, localalgos[i].name, len);
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226 }
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227 }
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228 buf_putstring(buf, algolist->data, algolist->len);
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229 buf_free(algolist);
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230 }