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annotate common-algo.c @ 528:378a6389f88e

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- Don't be dumb and encrypt/decrypt in a while() loop - why did I do this??
author Matt Johnston <matt@ucc.asn.au>
date Wed, 25 Feb 2009 14:04:02 +0000
parents 0cdbc95bb3d2
children 582cb38e4eb5 e12c9225acbd
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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 static int void_cipher(const unsigned char* in, unsigned char* out,
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33 unsigned long len, void *cipher_state) {
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34 memcpy(out, in, len);
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35 return CRYPT_OK;
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36 }
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37
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38 static int void_start(int cipher, const unsigned char *IV,
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39 const unsigned char *key,
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40 int keylen, int num_rounds, void *cipher_state) {
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41 return CRYPT_OK;
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42 }
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43
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44 /* Mappings for ciphers, parameters are
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45 {&cipher_desc, keysize, blocksize} */
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46 /* NOTE: if keysize > 2*SHA1_HASH_SIZE, code such as hashkeys()
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47 needs revisiting */
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48
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49 #ifdef DROPBEAR_AES256
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50 static const struct dropbear_cipher dropbear_aes256 =
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51 {&aes_desc, 32, 16};
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52 #endif
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53 #ifdef DROPBEAR_AES128
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54 static const struct dropbear_cipher dropbear_aes128 =
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55 {&aes_desc, 16, 16};
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56 #endif
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57 #ifdef DROPBEAR_BLOWFISH
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58 static const struct dropbear_cipher dropbear_blowfish =
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59 {&blowfish_desc, 16, 8};
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60 #endif
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61 #ifdef DROPBEAR_TWOFISH256
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62 static const struct dropbear_cipher dropbear_twofish256 =
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63 {&twofish_desc, 32, 16};
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64 #endif
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65 #ifdef DROPBEAR_TWOFISH128
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66 static const struct dropbear_cipher dropbear_twofish128 =
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67 {&twofish_desc, 16, 16};
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68 #endif
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69 #ifdef DROPBEAR_3DES
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70 static const struct dropbear_cipher dropbear_3des =
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71 {&des3_desc, 24, 8};
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72 #endif
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73
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74 /* used to indicate no encryption, as defined in rfc2410 */
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75 const struct dropbear_cipher dropbear_nocipher =
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76 {NULL, 16, 8};
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77
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78 /* A few void* s are required to silence warnings
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79 * about the symmetric_CBC vs symmetric_CTR cipher_state pointer */
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80 const struct dropbear_cipher_mode dropbear_mode_cbc =
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81 {(void*)cbc_start, (void*)cbc_encrypt, (void*)cbc_decrypt};
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82 const struct dropbear_cipher_mode dropbear_mode_none =
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83 {void_start, void_cipher, void_cipher};
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84 #ifdef DROPBEAR_ENABLE_CTR_MODE
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85 /* a wrapper to make ctr_start and cbc_start look the same */
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86 static int dropbear_big_endian_ctr_start(int cipher,
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87 const unsigned char *IV,
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88 const unsigned char *key, int keylen,
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89 int num_rounds, symmetric_CTR *ctr) {
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90 return ctr_start(cipher, IV, key, keylen, num_rounds, CTR_COUNTER_BIG_ENDIAN, ctr);
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91 }
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92 const struct dropbear_cipher_mode dropbear_mode_ctr =
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93 {(void*)dropbear_big_endian_ctr_start, (void*)ctr_encrypt, (void*)ctr_decrypt};
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94 #endif
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95
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96 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc.
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97 {&hash_desc, keysize, hashsize} */
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98
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99 #ifdef DROPBEAR_SHA1_HMAC
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100 static const struct dropbear_hash dropbear_sha1 =
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101 {&sha1_desc, 20, 20};
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102 #endif
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103 #ifdef DROPBEAR_SHA1_96_HMAC
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104 static const struct dropbear_hash dropbear_sha1_96 =
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105 {&sha1_desc, 20, 12};
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106 #endif
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107 #ifdef DROPBEAR_MD5_HMAC
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108 static const struct dropbear_hash dropbear_md5 =
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109 {&md5_desc, 16, 16};
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110 #endif
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111
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112 const struct dropbear_hash dropbear_nohash =
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113 {NULL, 16, 0}; /* used initially */
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114
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115
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116 /* The following map ssh names to internal values.
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117 * The ordering here is important for the client - the first mode
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118 * that is also supported by the server will get used. */
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119
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120 algo_type sshciphers[] = {
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121 #ifdef DROPBEAR_ENABLE_CTR_MODE
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122 #ifdef DROPBEAR_AES128
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123 {"aes128-ctr", 0, &dropbear_aes128, 1, &dropbear_mode_ctr},
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124 #endif
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125 #ifdef DROPBEAR_3DES
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126 {"3des-ctr", 0, &dropbear_3des, 1, &dropbear_mode_ctr},
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127 #endif
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128 #ifdef DROPBEAR_AES256
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129 {"aes256-ctr", 0, &dropbear_aes256, 1, &dropbear_mode_ctr},
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130 #endif
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131 #endif /* DROPBEAR_ENABLE_CTR_MODE */
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132
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133 /* CBC modes are always enabled */
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134 #ifdef DROPBEAR_AES128
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135 {"aes128-cbc", 0, &dropbear_aes128, 1, &dropbear_mode_cbc},
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136 #endif
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137 #ifdef DROPBEAR_3DES
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138 {"3des-cbc", 0, &dropbear_3des, 1, &dropbear_mode_cbc},
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139 #endif
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140 #ifdef DROPBEAR_AES256
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141 {"aes256-cbc", 0, &dropbear_aes256, 1, &dropbear_mode_cbc},
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142 #endif
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143 #ifdef DROPBEAR_TWOFISH256
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144 {"twofish256-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
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145 {"twofish-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
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146 #endif
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147 #ifdef DROPBEAR_TWOFISH128
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148 {"twofish128-cbc", 0, &dropbear_twofish128, 1, &dropbear_mode_cbc},
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149 #endif
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150 #ifdef DROPBEAR_BLOWFISH
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151 {"blowfish-cbc", 0, &dropbear_blowfish, 1, &dropbear_mode_cbc},
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152 #endif
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153 {NULL, 0, NULL, 0, NULL}
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154 };
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155
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156 algo_type sshhashes[] = {
228
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157 #ifdef DROPBEAR_SHA1_96_HMAC
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158 {"hmac-sha1-96", 0, &dropbear_sha1_96, 1, NULL},
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159 #endif
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160 #ifdef DROPBEAR_SHA1_HMAC
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161 {"hmac-sha1", 0, &dropbear_sha1, 1, NULL},
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162 #endif
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163 #ifdef DROPBEAR_MD5_HMAC
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164 {"hmac-md5", 0, &dropbear_md5, 1, NULL},
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165 #endif
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166 {NULL, 0, NULL, 0, NULL}
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167 };
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168
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169 algo_type sshcompress[] = {
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170 #ifndef DISABLE_ZLIB
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171 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1, NULL},
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172 {"[email protected]", DROPBEAR_COMP_ZLIB_DELAY, NULL, 1, NULL},
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173 #endif
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174 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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175 {NULL, 0, NULL, 0, NULL}
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176 };
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177
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178 algo_type sshhostkey[] = {
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179 #ifdef DROPBEAR_RSA
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180 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1, NULL},
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181 #endif
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182 #ifdef DROPBEAR_DSS
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183 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1, NULL},
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184 #endif
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185 {NULL, 0, NULL, 0, NULL}
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186 };
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187
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188 algo_type sshkex[] = {
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189 {"diffie-hellman-group1-sha1", DROPBEAR_KEX_DH_GROUP1, NULL, 1, NULL},
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190 {NULL, 0, NULL, 0, NULL}
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191 };
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192
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193
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194 /* Register the compiled in ciphers.
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195 * This should be run before using any of the ciphers/hashes */
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196 void crypto_init() {
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197
194
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198 const struct ltc_cipher_descriptor *regciphers[] = {
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199 #ifdef DROPBEAR_AES
150
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200 &aes_desc,
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201 #endif
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202 #ifdef DROPBEAR_BLOWFISH
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203 &blowfish_desc,
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204 #endif
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205 #ifdef DROPBEAR_TWOFISH
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206 &twofish_desc,
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207 #endif
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208 #ifdef DROPBEAR_3DES
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209 &des3_desc,
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210 #endif
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211 NULL
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212 };
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213
194
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214 const struct ltc_hash_descriptor *reghashes[] = {
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215 /* we need sha1 for hostkey stuff regardless */
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216 &sha1_desc,
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217 #ifdef DROPBEAR_MD5_HMAC
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218 &md5_desc,
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219 #endif
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220 NULL
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221 };
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222 int i;
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223
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224 for (i = 0; regciphers[i] != NULL; i++) {
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225 if (register_cipher(regciphers[i]) == -1) {
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226 dropbear_exit("error registering crypto");
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227 }
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228 }
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229
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230 for (i = 0; reghashes[i] != NULL; i++) {
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231 if (register_hash(reghashes[i]) == -1) {
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232 dropbear_exit("error registering crypto");
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233 }
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234 }
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235 }
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236
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237 /* algolen specifies the length of algo, algos is our local list to match
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238 * against.
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239 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
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240 * otherwise */
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241 int have_algo(char* algo, size_t algolen, algo_type algos[]) {
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242
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243 int i;
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244
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245 for (i = 0; algos[i].name != NULL; i++) {
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246 if (strlen(algos[i].name) == algolen
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247 && (strncmp(algos[i].name, algo, algolen) == 0)) {
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248 return DROPBEAR_SUCCESS;
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249 }
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250 }
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251
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252 return DROPBEAR_FAILURE;
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253 }
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254
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255
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256
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257 /* Output a comma separated list of algorithms to a buffer */
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258 void buf_put_algolist(buffer * buf, algo_type localalgos[]) {
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259
238
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260 unsigned int i, len;
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261 unsigned int donefirst = 0;
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262 buffer *algolist = NULL;
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263
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264 algolist = buf_new(160);
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265 for (i = 0; localalgos[i].name != NULL; i++) {
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266 if (localalgos[i].usable) {
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267 if (donefirst)
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268 buf_putbyte(algolist, ',');
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269 donefirst = 1;
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270 len = strlen(localalgos[i].name);
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271 buf_putbytes(algolist, localalgos[i].name, len);
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272 }
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273 }
238
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274 buf_putstring(buf, algolist->data, algolist->len);
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275 buf_free(algolist);
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276 }