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annotate common-algo.c @ 766:d1575fdc29a6 ecc

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start on ecdsa keys
author Matt Johnston <matt@ucc.asn.au>
date Tue, 09 Apr 2013 00:36:04 +0800
parents a78a38e402d1
children 7f604f9b3756
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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 "includes.h"
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27 #include "algo.h"
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28 #include "dbutil.h"
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29 #include "kex.h"
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30 #include "ltc_prng.h"
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31 #include "ecc.h"
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33 /* This file (algo.c) organises the ciphers which can be used, and is used to
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34 * decide which ciphers/hashes/compression/signing to use during key exchange*/
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35
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36 static int void_cipher(const unsigned char* in, unsigned char* out,
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37 unsigned long len, void* UNUSED(cipher_state)) {
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38 if (in != out) {
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39 memmove(out, in, len);
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40 }
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41 return CRYPT_OK;
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42 }
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43
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44 static int void_start(int UNUSED(cipher), const unsigned char* UNUSED(IV),
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45 const unsigned char* UNUSED(key),
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46 int UNUSED(keylen), int UNUSED(num_rounds), void* UNUSED(cipher_state)) {
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47 return CRYPT_OK;
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48 }
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49
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50 /* Mappings for ciphers, parameters are
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51 {&cipher_desc, keysize, blocksize} */
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52
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53 /* Remember to add new ciphers/hashes to regciphers/reghashes too */
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54
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55 #ifdef DROPBEAR_AES256
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56 static const struct dropbear_cipher dropbear_aes256 =
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57 {&aes_desc, 32, 16};
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58 #endif
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59 #ifdef DROPBEAR_AES128
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60 static const struct dropbear_cipher dropbear_aes128 =
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61 {&aes_desc, 16, 16};
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62 #endif
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63 #ifdef DROPBEAR_BLOWFISH
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64 static const struct dropbear_cipher dropbear_blowfish =
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65 {&blowfish_desc, 16, 8};
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66 #endif
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67 #ifdef DROPBEAR_TWOFISH256
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68 static const struct dropbear_cipher dropbear_twofish256 =
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69 {&twofish_desc, 32, 16};
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70 #endif
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71 #ifdef DROPBEAR_TWOFISH128
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72 static const struct dropbear_cipher dropbear_twofish128 =
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73 {&twofish_desc, 16, 16};
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74 #endif
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75 #ifdef DROPBEAR_3DES
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76 static const struct dropbear_cipher dropbear_3des =
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77 {&des3_desc, 24, 8};
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78 #endif
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80 /* used to indicate no encryption, as defined in rfc2410 */
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81 const struct dropbear_cipher dropbear_nocipher =
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82 {NULL, 16, 8};
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83
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84 /* A few void* s are required to silence warnings
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85 * about the symmetric_CBC vs symmetric_CTR cipher_state pointer */
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86 const struct dropbear_cipher_mode dropbear_mode_cbc =
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87 {(void*)cbc_start, (void*)cbc_encrypt, (void*)cbc_decrypt};
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88 const struct dropbear_cipher_mode dropbear_mode_none =
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89 {void_start, void_cipher, void_cipher};
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90 #ifdef DROPBEAR_ENABLE_CTR_MODE
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91 /* a wrapper to make ctr_start and cbc_start look the same */
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92 static int dropbear_big_endian_ctr_start(int cipher,
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93 const unsigned char *IV,
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94 const unsigned char *key, int keylen,
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95 int num_rounds, symmetric_CTR *ctr) {
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96 return ctr_start(cipher, IV, key, keylen, num_rounds, CTR_COUNTER_BIG_ENDIAN, ctr);
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97 }
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98 const struct dropbear_cipher_mode dropbear_mode_ctr =
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99 {(void*)dropbear_big_endian_ctr_start, (void*)ctr_encrypt, (void*)ctr_decrypt};
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100 #endif
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101
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102 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc.
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103 {&hash_desc, keysize, hashsize} */
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104
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105 #ifdef DROPBEAR_SHA1_HMAC
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106 static const struct dropbear_hash dropbear_sha1 =
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107 {&sha1_desc, 20, 20};
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108 #endif
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109 #ifdef DROPBEAR_SHA1_96_HMAC
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110 static const struct dropbear_hash dropbear_sha1_96 =
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111 {&sha1_desc, 20, 12};
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112 #endif
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113 #ifdef DROPBEAR_SHA2_256_HMAC
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114 static const struct dropbear_hash dropbear_sha2_256 =
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115 {&sha256_desc, 32, 32};
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116 #endif
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117 #ifdef DROPBEAR_SHA2_512_HMAC
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118 static const struct dropbear_hash dropbear_sha2_512 =
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119 {&sha512_desc, 64, 64};
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120 #endif
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121 #ifdef DROPBEAR_MD5_HMAC
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122 static const struct dropbear_hash dropbear_md5 =
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123 {&md5_desc, 16, 16};
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124 #endif
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125
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126 const struct dropbear_hash dropbear_nohash =
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127 {NULL, 16, 0}; /* used initially */
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128
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129
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130 /* The following map ssh names to internal values.
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131 * The ordering here is important for the client - the first mode
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132 * that is also supported by the server will get used. */
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133
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134 algo_type sshciphers[] = {
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135 #ifdef DROPBEAR_ENABLE_CTR_MODE
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136 #ifdef DROPBEAR_AES128
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137 {"aes128-ctr", 0, &dropbear_aes128, 1, &dropbear_mode_ctr},
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138 #endif
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139 #ifdef DROPBEAR_3DES
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140 {"3des-ctr", 0, &dropbear_3des, 1, &dropbear_mode_ctr},
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141 #endif
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142 #ifdef DROPBEAR_AES256
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143 {"aes256-ctr", 0, &dropbear_aes256, 1, &dropbear_mode_ctr},
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144 #endif
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145 #endif /* DROPBEAR_ENABLE_CTR_MODE */
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146
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147 /* CBC modes are always enabled */
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148 #ifdef DROPBEAR_AES128
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149 {"aes128-cbc", 0, &dropbear_aes128, 1, &dropbear_mode_cbc},
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150 #endif
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151 #ifdef DROPBEAR_3DES
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152 {"3des-cbc", 0, &dropbear_3des, 1, &dropbear_mode_cbc},
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153 #endif
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154 #ifdef DROPBEAR_AES256
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155 {"aes256-cbc", 0, &dropbear_aes256, 1, &dropbear_mode_cbc},
235
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156 #endif
502
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157 #ifdef DROPBEAR_TWOFISH256
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158 {"twofish256-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
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159 {"twofish-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
235
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160 #endif
502
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161 #ifdef DROPBEAR_TWOFISH128
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162 {"twofish128-cbc", 0, &dropbear_twofish128, 1, &dropbear_mode_cbc},
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163 #endif
502
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164 #ifdef DROPBEAR_BLOWFISH
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165 {"blowfish-cbc", 0, &dropbear_blowfish, 1, &dropbear_mode_cbc},
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166 #endif
252
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167 #ifdef DROPBEAR_NONE_CIPHER
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168 {"none", 0, (void*)&dropbear_nocipher, 1, &dropbear_mode_none},
252
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169 #endif
502
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170 {NULL, 0, NULL, 0, NULL}
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171 };
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172
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173 algo_type sshhashes[] = {
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174 #ifdef DROPBEAR_SHA2_256_HMAC
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175 {"hmac-sha2-256", 0, &dropbear_sha2_256, 1, NULL},
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176 #endif
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177 #ifdef DROPBEAR_SHA2_512_HMAC
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178 {"hmac-sha2-512", 0, &dropbear_sha2_512, 1, NULL},
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179 #endif
228
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180 #ifdef DROPBEAR_SHA1_96_HMAC
502
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181 {"hmac-sha1-96", 0, &dropbear_sha1_96, 1, NULL},
228
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182 #endif
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183 #ifdef DROPBEAR_SHA1_HMAC
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184 {"hmac-sha1", 0, &dropbear_sha1, 1, NULL},
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185 #endif
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186 #ifdef DROPBEAR_MD5_HMAC
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187 {"hmac-md5", 0, (void*)&dropbear_md5, 1, NULL},
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188 #endif
252
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189 #ifdef DROPBEAR_NONE_INTEGRITY
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190 {"none", 0, (void*)&dropbear_nohash, 1, NULL},
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191 #endif
502
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192 {NULL, 0, NULL, 0, NULL}
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193 };
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194
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195 #ifndef DISABLE_ZLIB
575
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196 algo_type ssh_compress[] = {
502
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197 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1, NULL},
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198 {"[email protected]", DROPBEAR_COMP_ZLIB_DELAY, NULL, 1, NULL},
575
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199 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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200 {NULL, 0, NULL, 0, NULL}
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201 };
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202 #endif
575
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203
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204 algo_type ssh_nocompress[] = {
502
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205 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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206 {NULL, 0, NULL, 0, NULL}
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207 };
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208
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209 algo_type sshhostkey[] = {
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210 #ifdef DROPBEAR_RSA
502
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211 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1, NULL},
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212 #endif
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213 #ifdef DROPBEAR_DSS
502
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214 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1, NULL},
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215 #endif
502
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216 {NULL, 0, NULL, 0, NULL}
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217 };
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218
759
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219 static struct dropbear_kex kex_dh_group1 = {dh_p_1, DH_P_1_LEN, NULL, &sha1_desc };
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220 static struct dropbear_kex kex_dh_group14 = {dh_p_14, DH_P_14_LEN, NULL, &sha1_desc };
756
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221
761
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222 #ifdef DROPBEAR_ECDH
756
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223 #ifdef DROPBEAR_ECC_256
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224 static struct dropbear_kex kex_ecdh_nistp256 = {NULL, 0, &ecc_curve_nistp256, &sha256_desc };
756
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225 #endif
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226 #ifdef DROPBEAR_ECC_384
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227 static struct dropbear_kex kex_ecdh_nistp384 = {NULL, 0, &ecc_curve_nistp384, &sha384_desc };
756
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228 #endif
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229 #ifdef DROPBEAR_ECC_521
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230 static struct dropbear_kex kex_ecdh_nistp521 = {NULL, 0, &ecc_curve_nistp521, &sha512_desc };
756
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231 #endif
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232 #endif // DROPBEAR_ECDH
756
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233
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234
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235 algo_type sshkex[] = {
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236 #ifdef DROPBEAR_ECDH
756
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237 #ifdef DROPBEAR_ECC_256
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238 {"ecdh-sha2-nistp256", 0, &kex_ecdh_nistp256, 1, NULL},
756
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239 #endif
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240 #ifdef DROPBEAR_ECC_384
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241 {"ecdh-sha2-nistp384", 0, &kex_ecdh_nistp384, 1, NULL},
756
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242 #endif
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243 #ifdef DROPBEAR_ECC_521
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244 {"ecdh-sha2-nistp521", 0, &kex_ecdh_nistp521, 1, NULL},
756
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245 #endif
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246 #endif
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247 {"diffie-hellman-group1-sha1", 0, &kex_dh_group1, 1, NULL},
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248 {"diffie-hellman-group14-sha1", 0, &kex_dh_group14, 1, NULL},
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249 {NULL, 0, NULL, 0, NULL}
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250 };
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251
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252 /* algolen specifies the length of algo, algos is our local list to match
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253 * against.
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254 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
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255 * otherwise */
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256 int have_algo(char* algo, size_t algolen, algo_type algos[]) {
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257
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258 int i;
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259
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260 for (i = 0; algos[i].name != NULL; i++) {
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261 if (strlen(algos[i].name) == algolen
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262 && (strncmp(algos[i].name, algo, algolen) == 0)) {
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263 return DROPBEAR_SUCCESS;
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264 }
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265 }
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266
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267 return DROPBEAR_FAILURE;
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268 }
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269
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270 /* Output a comma separated list of algorithms to a buffer */
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271 void buf_put_algolist(buffer * buf, algo_type localalgos[]) {
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272
238
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diff changeset
273 unsigned int i, len;
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274 unsigned int donefirst = 0;
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275 buffer *algolist = NULL;
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276
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277 algolist = buf_new(160);
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278 for (i = 0; localalgos[i].name != NULL; i++) {
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279 if (localalgos[i].usable) {
238
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280 if (donefirst)
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281 buf_putbyte(algolist, ',');
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282 donefirst = 1;
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283 len = strlen(localalgos[i].name);
238
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diff changeset
284 buf_putbytes(algolist, localalgos[i].name, len);
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285 }
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286 }
238
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287 buf_putstring(buf, algolist->data, algolist->len);
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288 buf_free(algolist);
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289 }
682
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290
686
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291 #ifdef DROPBEAR_NONE_CIPHER
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292
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293 void
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294 set_algo_usable(algo_type algos[], const char * algo_name, int usable)
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295 {
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296 algo_type *a;
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297 for (a = algos; a->name != NULL; a++)
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298 {
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299 if (strcmp(a->name, algo_name) == 0)
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300 {
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301 a->usable = usable;
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302 return;
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303 }
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304 }
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305 }
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306
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307 int
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308 get_algo_usable(algo_type algos[], const char * algo_name)
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309 {
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310 algo_type *a;
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311 for (a = algos; a->name != NULL; a++)
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312 {
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313 if (strcmp(a->name, algo_name) == 0)
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314 {
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315 return a->usable;
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316 }
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317 }
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318 return 0;
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319 }
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320
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321 #endif // DROPBEAR_NONE_CIPHER
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322
682
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323 #ifdef ENABLE_USER_ALGO_LIST
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324
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325 char *
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326 algolist_string(algo_type algos[])
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327 {
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328 char *ret_list;
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329 buffer *b = buf_new(200);
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330 buf_put_algolist(b, algos);
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331 buf_setpos(b, b->len);
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332 buf_putbyte(b, '\0');
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333 buf_setpos(b, 4);
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334 ret_list = m_strdup(buf_getptr(b, b->len - b->pos));
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diff changeset
335 buf_free(b);
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336 return ret_list;
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337 }
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338
683
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339 static algo_type*
682
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diff changeset
340 check_algo(const char* algo_name, algo_type *algos)
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341 {
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342 algo_type *a;
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diff changeset
343 for (a = algos; a->name != NULL; a++)
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344 {
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345 if (strcmp(a->name, algo_name) == 0)
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346 {
683
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347 return a;
682
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diff changeset
348 }
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349 }
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350
683
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351 return NULL;
682
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diff changeset
352 }
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353
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diff changeset
354 static void
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355 try_add_algo(const char *algo_name, algo_type *algos,
683
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356 const char *algo_desc, algo_type * new_algos, int *num_ret)
682
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357 {
683
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diff changeset
358 algo_type *match_algo = check_algo(algo_name, algos);
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diff changeset
359 if (!match_algo)
682
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diff changeset
360 {
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diff changeset
361 dropbear_log(LOG_WARNING, "This Dropbear program does not support '%s' %s algorithm", algo_name, algo_desc);
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diff changeset
362 return;
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diff changeset
363 }
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diff changeset
364
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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diff changeset
365 new_algos[*num_ret] = *match_algo;
682
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diff changeset
366 (*num_ret)++;
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diff changeset
367 }
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diff changeset
368
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369 /* Checks a user provided comma-separated algorithm list for available
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diff changeset
370 * options. Any that are not acceptable are removed in-place. Returns the
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diff changeset
371 * number of valid algorithms. */
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diff changeset
372 int
683
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diff changeset
373 check_user_algos(const char* user_algo_list, algo_type * algos,
682
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diff changeset
374 const char *algo_desc)
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diff changeset
375 {
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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diff changeset
376 algo_type new_algos[MAX_PROPOSED_ALGO];
682
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diff changeset
377 /* this has two passes. first we sweep through the given list of
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diff changeset
378 * algorithms and mark them as usable=2 in the algo_type[] array... */
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diff changeset
379 int num_ret = 0;
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diff changeset
380 char *work_list = m_strdup(user_algo_list);
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diff changeset
381 char *last_name = work_list;
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diff changeset
382 char *c;
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diff changeset
383 for (c = work_list; *c; c++)
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diff changeset
384 {
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diff changeset
385 if (*c == ',')
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diff changeset
386 {
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diff changeset
387 *c = '\0';
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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diff changeset
388 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret);
686
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diff changeset
389 c++;
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diff changeset
390 last_name = c;
682
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diff changeset
391 }
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diff changeset
392 }
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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diff changeset
393 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret);
682
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diff changeset
394 m_free(work_list);
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diff changeset
395
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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diff changeset
396 new_algos[num_ret].name = NULL;
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
397
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
398 /* Copy one more as a blank delimiter */
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
399 memcpy(algos, new_algos, sizeof(*new_algos) * (num_ret+1));
682
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diff changeset
400 return num_ret;
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diff changeset
401 }
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diff changeset
402 #endif // ENABLE_USER_ALGO_LIST