annotate common-algo.c @ 759:76fba0856749 ecc

More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, ses.hash and ses.session_id are now buffers (doesn't compile)
author Matt Johnston <matt@ucc.asn.au>
date Fri, 29 Mar 2013 00:28:09 +0800
parents bf9dc2d9c2b1
children ac2158e3e403
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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 #include "kex.h"
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30 /* This file (algo.c) organises the ciphers which can be used, and is used to
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31 * decide which ciphers/hashes/compression/signing to use during key exchange*/
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32
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33 static int void_cipher(const unsigned char* in, unsigned char* out,
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34 unsigned long len, void *cipher_state) {
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35 if (in != out) {
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36 memmove(out, in, len);
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37 }
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38 return CRYPT_OK;
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39 }
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40
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41 static int void_start(int cipher, const unsigned char *IV,
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42 const unsigned char *key,
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43 int keylen, int num_rounds, void *cipher_state) {
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44 return CRYPT_OK;
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45 }
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46
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47 /* Mappings for ciphers, parameters are
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48 {&cipher_desc, keysize, blocksize} */
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49
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50 /* Remember to add new ciphers/hashes to regciphers/reghashes too */
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51
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52 #ifdef DROPBEAR_AES256
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53 static const struct dropbear_cipher dropbear_aes256 =
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54 {&aes_desc, 32, 16};
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55 #endif
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56 #ifdef DROPBEAR_AES128
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57 static const struct dropbear_cipher dropbear_aes128 =
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58 {&aes_desc, 16, 16};
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59 #endif
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60 #ifdef DROPBEAR_BLOWFISH
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61 static const struct dropbear_cipher dropbear_blowfish =
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62 {&blowfish_desc, 16, 8};
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63 #endif
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64 #ifdef DROPBEAR_TWOFISH256
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65 static const struct dropbear_cipher dropbear_twofish256 =
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66 {&twofish_desc, 32, 16};
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67 #endif
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68 #ifdef DROPBEAR_TWOFISH128
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69 static const struct dropbear_cipher dropbear_twofish128 =
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70 {&twofish_desc, 16, 16};
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71 #endif
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72 #ifdef DROPBEAR_3DES
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73 static const struct dropbear_cipher dropbear_3des =
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74 {&des3_desc, 24, 8};
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75 #endif
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77 /* used to indicate no encryption, as defined in rfc2410 */
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78 const struct dropbear_cipher dropbear_nocipher =
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79 {NULL, 16, 8};
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80
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81 /* A few void* s are required to silence warnings
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82 * about the symmetric_CBC vs symmetric_CTR cipher_state pointer */
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83 const struct dropbear_cipher_mode dropbear_mode_cbc =
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84 {(void*)cbc_start, (void*)cbc_encrypt, (void*)cbc_decrypt};
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85 const struct dropbear_cipher_mode dropbear_mode_none =
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86 {void_start, void_cipher, void_cipher};
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87 #ifdef DROPBEAR_ENABLE_CTR_MODE
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88 /* a wrapper to make ctr_start and cbc_start look the same */
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89 static int dropbear_big_endian_ctr_start(int cipher,
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90 const unsigned char *IV,
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91 const unsigned char *key, int keylen,
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92 int num_rounds, symmetric_CTR *ctr) {
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93 return ctr_start(cipher, IV, key, keylen, num_rounds, CTR_COUNTER_BIG_ENDIAN, ctr);
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94 }
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95 const struct dropbear_cipher_mode dropbear_mode_ctr =
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96 {(void*)dropbear_big_endian_ctr_start, (void*)ctr_encrypt, (void*)ctr_decrypt};
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97 #endif
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98
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99 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc.
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100 {&hash_desc, keysize, hashsize} */
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101
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102 #ifdef DROPBEAR_SHA1_HMAC
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103 static const struct dropbear_hash dropbear_sha1 =
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104 {&sha1_desc, 20, 20};
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105 #endif
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106 #ifdef DROPBEAR_SHA1_96_HMAC
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107 static const struct dropbear_hash dropbear_sha1_96 =
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108 {&sha1_desc, 20, 12};
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109 #endif
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110 #ifdef DROPBEAR_SHA2_256_HMAC
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111 static const struct dropbear_hash dropbear_sha2_256 =
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112 {&sha256_desc, 32, 32};
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113 #endif
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114 #ifdef DROPBEAR_SHA2_512_HMAC
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115 static const struct dropbear_hash dropbear_sha2_512 =
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116 {&sha512_desc, 64, 64};
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117 #endif
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118 #ifdef DROPBEAR_MD5_HMAC
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119 static const struct dropbear_hash dropbear_md5 =
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120 {&md5_desc, 16, 16};
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121 #endif
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122
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123 const struct dropbear_hash dropbear_nohash =
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124 {NULL, 16, 0}; /* used initially */
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126
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127 /* The following map ssh names to internal values.
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128 * The ordering here is important for the client - the first mode
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129 * that is also supported by the server will get used. */
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130
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131 algo_type sshciphers[] = {
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132 #ifdef DROPBEAR_ENABLE_CTR_MODE
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133 #ifdef DROPBEAR_AES128
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134 {"aes128-ctr", 0, &dropbear_aes128, 1, &dropbear_mode_ctr},
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135 #endif
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136 #ifdef DROPBEAR_3DES
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137 {"3des-ctr", 0, &dropbear_3des, 1, &dropbear_mode_ctr},
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138 #endif
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139 #ifdef DROPBEAR_AES256
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140 {"aes256-ctr", 0, &dropbear_aes256, 1, &dropbear_mode_ctr},
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141 #endif
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142 #endif /* DROPBEAR_ENABLE_CTR_MODE */
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143
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144 /* CBC modes are always enabled */
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145 #ifdef DROPBEAR_AES128
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146 {"aes128-cbc", 0, &dropbear_aes128, 1, &dropbear_mode_cbc},
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147 #endif
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148 #ifdef DROPBEAR_3DES
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149 {"3des-cbc", 0, &dropbear_3des, 1, &dropbear_mode_cbc},
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150 #endif
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151 #ifdef DROPBEAR_AES256
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152 {"aes256-cbc", 0, &dropbear_aes256, 1, &dropbear_mode_cbc},
235
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153 #endif
502
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154 #ifdef DROPBEAR_TWOFISH256
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155 {"twofish256-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
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156 {"twofish-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
235
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157 #endif
502
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158 #ifdef DROPBEAR_TWOFISH128
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159 {"twofish128-cbc", 0, &dropbear_twofish128, 1, &dropbear_mode_cbc},
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160 #endif
502
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161 #ifdef DROPBEAR_BLOWFISH
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162 {"blowfish-cbc", 0, &dropbear_blowfish, 1, &dropbear_mode_cbc},
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163 #endif
252
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164 #ifdef DROPBEAR_NONE_CIPHER
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165 {"none", 0, (void*)&dropbear_nocipher, 1, &dropbear_mode_none},
252
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166 #endif
502
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167 {NULL, 0, NULL, 0, NULL}
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168 };
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169
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170 algo_type sshhashes[] = {
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171 #ifdef DROPBEAR_SHA2_256_HMAC
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172 {"hmac-sha2-256", 0, &dropbear_sha2_256, 1, NULL},
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173 #endif
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174 #ifdef DROPBEAR_SHA2_512_HMAC
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175 {"hmac-sha2-512", 0, &dropbear_sha2_512, 1, NULL},
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176 #endif
228
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177 #ifdef DROPBEAR_SHA1_96_HMAC
502
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178 {"hmac-sha1-96", 0, &dropbear_sha1_96, 1, NULL},
228
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179 #endif
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180 #ifdef DROPBEAR_SHA1_HMAC
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181 {"hmac-sha1", 0, &dropbear_sha1, 1, NULL},
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182 #endif
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183 #ifdef DROPBEAR_MD5_HMAC
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184 {"hmac-md5", 0, (void*)&dropbear_md5, 1, NULL},
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185 #endif
252
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186 #ifdef DROPBEAR_NONE_INTEGRITY
681
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187 {"none", 0, (void*)&dropbear_nohash, 1, NULL},
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188 #endif
502
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189 {NULL, 0, NULL, 0, NULL}
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190 };
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191
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192 #ifndef DISABLE_ZLIB
575
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193 algo_type ssh_compress[] = {
502
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194 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1, NULL},
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195 {"[email protected]", DROPBEAR_COMP_ZLIB_DELAY, NULL, 1, NULL},
575
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196 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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197 {NULL, 0, NULL, 0, NULL}
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198 };
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199 #endif
575
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200
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201 algo_type ssh_nocompress[] = {
502
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202 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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203 {NULL, 0, NULL, 0, NULL}
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204 };
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205
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206 algo_type sshhostkey[] = {
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207 #ifdef DROPBEAR_RSA
502
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208 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1, NULL},
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209 #endif
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210 #ifdef DROPBEAR_DSS
502
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211 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1, NULL},
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212 #endif
502
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213 {NULL, 0, NULL, 0, NULL}
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214 };
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215
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216 static struct dropbear_kex kex_dh_group1 = {dh_p_1, DH_P_1_LEN, NULL, &sha1_desc };
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217 static struct dropbear_kex kex_dh_group14 = {dh_p_14, DH_P_14_LEN, NULL, &sha1_desc };
756
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218
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219 #ifdef DROPBEAR_ECC_DH
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220 #ifdef DROPBEAR_ECC_256
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221 static struct dropbear_kex kex_ecdh_secp256r1 = {NULL, 0, &ecc_curve_secp256r1, &sha256_desc };
756
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222 #endif
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223 #ifdef DROPBEAR_ECC_384
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224 static struct dropbear_kex kex_ecdh_secp384r1 = {NULL, 0, &ecc_curve_secp384r1, &sha384_desc };
756
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225 #endif
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226 #ifdef DROPBEAR_ECC_521
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227 static struct dropbear_kex kex_ecdh_secp521r1 = {NULL, 0, &ecc_curve_secp521r1, &sha512_desc };
756
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228 #endif
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229 #endif // DROPBEAR_ECC_DH
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230
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231
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232 algo_type sshkex[] = {
756
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233 #ifdef DROPBEAR_ECC_DH
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234 #ifdef DROPBEAR_ECC_256
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235 {"ecdh-sha2-secp256r1", 0, &kex_ecdh_descp256r1, 1, NULL},
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236 #endif
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237 #ifdef DROPBEAR_ECC_384
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238 {"ecdh-sha2-secp384r1", 0, &kex_ecdh_descp384r1, 1, NULL},
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239 #endif
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240 #ifdef DROPBEAR_ECC_521
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241 {"ecdh-sha2-secp521r1", 0, &kex_ecdh_descp521r1, 1, NULL},
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242 #endif
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243 #endif
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244 {"diffie-hellman-group1-sha1", 0, &kex_dh_group1, 1, NULL},
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245 {"diffie-hellman-group14-sha1", 0, &kex_dh_group14, 1, NULL},
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246 {NULL, 0, NULL, 0, NULL}
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247 };
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248
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249
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250 /* Register the compiled in ciphers.
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251 * This should be run before using any of the ciphers/hashes */
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252 void crypto_init() {
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253
194
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diff changeset
254 const struct ltc_cipher_descriptor *regciphers[] = {
502
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255 #ifdef DROPBEAR_AES
150
82fcf3185616 Cleaning out various dead wood found with -dead_strip
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256 &aes_desc,
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257 #endif
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258 #ifdef DROPBEAR_BLOWFISH
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259 &blowfish_desc,
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260 #endif
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261 #ifdef DROPBEAR_TWOFISH
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262 &twofish_desc,
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263 #endif
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264 #ifdef DROPBEAR_3DES
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265 &des3_desc,
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266 #endif
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267 NULL
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268 };
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269
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270 const struct ltc_hash_descriptor *reghashes[] = {
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271 /* we need sha1 for hostkey stuff regardless */
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272 &sha1_desc,
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273 #ifdef DROPBEAR_MD5_HMAC
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274 &md5_desc,
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275 #endif
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276 #ifdef DROPBEAR_SHA256
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277 &sha256_desc,
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278 #endif
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279 #ifdef DROPBEAR_SHA384
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280 &sha384_desc,
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281 #endif
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282 #ifdef DROPBEAR_SHA512
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283 &sha512_desc,
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284 #endif
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285 NULL
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286 };
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287 int i;
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288
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289 for (i = 0; regciphers[i] != NULL; i++) {
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290 if (register_cipher(regciphers[i]) == -1) {
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291 dropbear_exit("Error registering crypto");
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292 }
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293 }
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294
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295 for (i = 0; reghashes[i] != NULL; i++) {
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296 if (register_hash(reghashes[i]) == -1) {
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297 dropbear_exit("Error registering crypto");
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298 }
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299 }
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300 }
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301
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302 /* algolen specifies the length of algo, algos is our local list to match
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303 * against.
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304 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
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305 * otherwise */
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306 int have_algo(char* algo, size_t algolen, algo_type algos[]) {
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307
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308 int i;
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309
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310 for (i = 0; algos[i].name != NULL; i++) {
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311 if (strlen(algos[i].name) == algolen
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312 && (strncmp(algos[i].name, algo, algolen) == 0)) {
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313 return DROPBEAR_SUCCESS;
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314 }
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315 }
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316
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317 return DROPBEAR_FAILURE;
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318 }
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319
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320 /* Output a comma separated list of algorithms to a buffer */
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321 void buf_put_algolist(buffer * buf, algo_type localalgos[]) {
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322
238
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323 unsigned int i, len;
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324 unsigned int donefirst = 0;
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325 buffer *algolist = NULL;
4
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326
502
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327 algolist = buf_new(160);
4
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328 for (i = 0; localalgos[i].name != NULL; i++) {
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329 if (localalgos[i].usable) {
238
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330 if (donefirst)
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331 buf_putbyte(algolist, ',');
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332 donefirst = 1;
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333 len = strlen(localalgos[i].name);
238
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334 buf_putbytes(algolist, localalgos[i].name, len);
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335 }
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336 }
238
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337 buf_putstring(buf, algolist->data, algolist->len);
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diff changeset
338 buf_free(algolist);
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339 }
682
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340
686
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341 #ifdef DROPBEAR_NONE_CIPHER
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342
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diff changeset
343 void
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diff changeset
344 set_algo_usable(algo_type algos[], const char * algo_name, int usable)
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345 {
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diff changeset
346 algo_type *a;
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diff changeset
347 for (a = algos; a->name != NULL; a++)
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diff changeset
348 {
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diff changeset
349 if (strcmp(a->name, algo_name) == 0)
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diff changeset
350 {
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diff changeset
351 a->usable = usable;
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352 return;
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diff changeset
353 }
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354 }
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355 }
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356
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diff changeset
357 int
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diff changeset
358 get_algo_usable(algo_type algos[], const char * algo_name)
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diff changeset
359 {
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diff changeset
360 algo_type *a;
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diff changeset
361 for (a = algos; a->name != NULL; a++)
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diff changeset
362 {
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diff changeset
363 if (strcmp(a->name, algo_name) == 0)
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diff changeset
364 {
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diff changeset
365 return a->usable;
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diff changeset
366 }
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367 }
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diff changeset
368 return 0;
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diff changeset
369 }
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370
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diff changeset
371 #endif // DROPBEAR_NONE_CIPHER
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372
682
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373 #ifdef ENABLE_USER_ALGO_LIST
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374
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diff changeset
375 char *
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diff changeset
376 algolist_string(algo_type algos[])
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diff changeset
377 {
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diff changeset
378 char *ret_list;
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diff changeset
379 buffer *b = buf_new(200);
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diff changeset
380 buf_put_algolist(b, algos);
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diff changeset
381 buf_setpos(b, b->len);
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diff changeset
382 buf_putbyte(b, '\0');
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diff changeset
383 buf_setpos(b, 4);
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diff changeset
384 ret_list = m_strdup(buf_getptr(b, b->len - b->pos));
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diff changeset
385 buf_free(b);
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diff changeset
386 return ret_list;
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diff changeset
387 }
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parents: 595
diff changeset
388
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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diff changeset
389 static algo_type*
682
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diff changeset
390 check_algo(const char* algo_name, algo_type *algos)
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diff changeset
391 {
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diff changeset
392 algo_type *a;
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diff changeset
393 for (a = algos; a->name != NULL; a++)
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diff changeset
394 {
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parents: 595
diff changeset
395 if (strcmp(a->name, algo_name) == 0)
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diff changeset
396 {
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
397 return a;
682
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diff changeset
398 }
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diff changeset
399 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
400
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
401 return NULL;
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
402 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
403
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
404 static void
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
405 try_add_algo(const char *algo_name, algo_type *algos,
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
406 const char *algo_desc, algo_type * new_algos, int *num_ret)
682
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parents: 595
diff changeset
407 {
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
408 algo_type *match_algo = check_algo(algo_name, algos);
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
409 if (!match_algo)
682
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parents: 595
diff changeset
410 {
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
411 dropbear_log(LOG_WARNING, "This Dropbear program does not support '%s' %s algorithm", algo_name, algo_desc);
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parents: 595
diff changeset
412 return;
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parents: 595
diff changeset
413 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
414
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
415 new_algos[*num_ret] = *match_algo;
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
416 (*num_ret)++;
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
417 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
418
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
419 /* Checks a user provided comma-separated algorithm list for available
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parents: 595
diff changeset
420 * options. Any that are not acceptable are removed in-place. Returns the
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
421 * number of valid algorithms. */
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parents: 595
diff changeset
422 int
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
423 check_user_algos(const char* user_algo_list, algo_type * algos,
682
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424 const char *algo_desc)
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425 {
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426 algo_type new_algos[MAX_PROPOSED_ALGO];
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427 /* this has two passes. first we sweep through the given list of
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428 * algorithms and mark them as usable=2 in the algo_type[] array... */
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429 int num_ret = 0;
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430 char *work_list = m_strdup(user_algo_list);
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431 char *last_name = work_list;
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432 char *c;
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433 for (c = work_list; *c; c++)
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434 {
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435 if (*c == ',')
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436 {
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437 *c = '\0';
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438 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret);
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439 c++;
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440 last_name = c;
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441 }
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442 }
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443 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret);
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444 m_free(work_list);
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445
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446 new_algos[num_ret].name = NULL;
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447
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448 /* Copy one more as a blank delimiter */
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449 memcpy(algos, new_algos, sizeof(*new_algos) * (num_ret+1));
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450 return num_ret;
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451 }
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452 #endif // ENABLE_USER_ALGO_LIST