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annotate common-algo.c @ 682:4edea9f363d0

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Add rough support for choosing ciphers/hashes with "-c" or "-m"
author Matt Johnston <matt@ucc.asn.au>
date Thu, 17 May 2012 00:12:42 +0800
parents 2895626d864f
children 63f8d6c469cf
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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 if (in != out) {
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35 memmove(out, in, len);
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36 }
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37 return CRYPT_OK;
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38 }
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39
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40 static int void_start(int cipher, const unsigned char *IV,
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41 const unsigned char *key,
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42 int keylen, int num_rounds, void *cipher_state) {
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43 return CRYPT_OK;
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44 }
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45
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46 /* Mappings for ciphers, parameters are
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47 {&cipher_desc, keysize, blocksize} */
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48 /* NOTE: if keysize > 2*SHA1_HASH_SIZE, code such as hashkeys()
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49 needs revisiting */
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50
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51 #ifdef DROPBEAR_AES256
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52 static const struct dropbear_cipher dropbear_aes256 =
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53 {&aes_desc, 32, 16};
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54 #endif
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55 #ifdef DROPBEAR_AES128
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56 static const struct dropbear_cipher dropbear_aes128 =
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57 {&aes_desc, 16, 16};
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58 #endif
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59 #ifdef DROPBEAR_BLOWFISH
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60 static const struct dropbear_cipher dropbear_blowfish =
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61 {&blowfish_desc, 16, 8};
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62 #endif
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63 #ifdef DROPBEAR_TWOFISH256
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64 static const struct dropbear_cipher dropbear_twofish256 =
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65 {&twofish_desc, 32, 16};
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66 #endif
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67 #ifdef DROPBEAR_TWOFISH128
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68 static const struct dropbear_cipher dropbear_twofish128 =
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69 {&twofish_desc, 16, 16};
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70 #endif
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71 #ifdef DROPBEAR_3DES
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72 static const struct dropbear_cipher dropbear_3des =
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73 {&des3_desc, 24, 8};
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74 #endif
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76 /* used to indicate no encryption, as defined in rfc2410 */
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77 const struct dropbear_cipher dropbear_nocipher =
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78 {NULL, 16, 8};
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79
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80 /* A few void* s are required to silence warnings
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81 * about the symmetric_CBC vs symmetric_CTR cipher_state pointer */
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82 const struct dropbear_cipher_mode dropbear_mode_cbc =
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83 {(void*)cbc_start, (void*)cbc_encrypt, (void*)cbc_decrypt};
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84 const struct dropbear_cipher_mode dropbear_mode_none =
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85 {void_start, void_cipher, void_cipher};
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86 #ifdef DROPBEAR_ENABLE_CTR_MODE
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87 /* a wrapper to make ctr_start and cbc_start look the same */
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88 static int dropbear_big_endian_ctr_start(int cipher,
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89 const unsigned char *IV,
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90 const unsigned char *key, int keylen,
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91 int num_rounds, symmetric_CTR *ctr) {
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92 return ctr_start(cipher, IV, key, keylen, num_rounds, CTR_COUNTER_BIG_ENDIAN, ctr);
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93 }
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94 const struct dropbear_cipher_mode dropbear_mode_ctr =
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95 {(void*)dropbear_big_endian_ctr_start, (void*)ctr_encrypt, (void*)ctr_decrypt};
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96 #endif
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97
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98 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc.
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99 {&hash_desc, keysize, hashsize} */
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100
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101 #ifdef DROPBEAR_SHA1_HMAC
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102 static const struct dropbear_hash dropbear_sha1 =
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103 {&sha1_desc, 20, 20};
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104 #endif
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105 #ifdef DROPBEAR_SHA1_96_HMAC
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106 static const struct dropbear_hash dropbear_sha1_96 =
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107 {&sha1_desc, 20, 12};
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108 #endif
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109 #ifdef DROPBEAR_MD5_HMAC
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110 static const struct dropbear_hash dropbear_md5 =
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111 {&md5_desc, 16, 16};
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112 #endif
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113
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114 const struct dropbear_hash dropbear_nohash =
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115 {NULL, 16, 0}; /* used initially */
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116
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117
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118 /* The following map ssh names to internal values.
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119 * The ordering here is important for the client - the first mode
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120 * that is also supported by the server will get used. */
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121
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122 algo_type sshciphers[] = {
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123 #ifdef DROPBEAR_ENABLE_CTR_MODE
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124 #ifdef DROPBEAR_AES128
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125 {"aes128-ctr", 0, &dropbear_aes128, 1, &dropbear_mode_ctr},
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126 #endif
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127 #ifdef DROPBEAR_3DES
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128 {"3des-ctr", 0, &dropbear_3des, 1, &dropbear_mode_ctr},
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129 #endif
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130 #ifdef DROPBEAR_AES256
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131 {"aes256-ctr", 0, &dropbear_aes256, 1, &dropbear_mode_ctr},
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132 #endif
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133 #endif /* DROPBEAR_ENABLE_CTR_MODE */
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134
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135 /* CBC modes are always enabled */
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136 #ifdef DROPBEAR_AES128
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137 {"aes128-cbc", 0, &dropbear_aes128, 1, &dropbear_mode_cbc},
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138 #endif
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139 #ifdef DROPBEAR_3DES
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140 {"3des-cbc", 0, &dropbear_3des, 1, &dropbear_mode_cbc},
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141 #endif
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142 #ifdef DROPBEAR_AES256
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143 {"aes256-cbc", 0, &dropbear_aes256, 1, &dropbear_mode_cbc},
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144 #endif
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145 #ifdef DROPBEAR_TWOFISH256
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146 {"twofish256-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
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147 {"twofish-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
235
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148 #endif
502
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149 #ifdef DROPBEAR_TWOFISH128
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150 {"twofish128-cbc", 0, &dropbear_twofish128, 1, &dropbear_mode_cbc},
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151 #endif
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152 #ifdef DROPBEAR_BLOWFISH
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153 {"blowfish-cbc", 0, &dropbear_blowfish, 1, &dropbear_mode_cbc},
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154 #endif
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155 {NULL, 0, NULL, 0, NULL}
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156 };
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157
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158 algo_type sshhashes[] = {
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159 #ifdef DROPBEAR_SHA1_96_HMAC
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160 {"hmac-sha1-96", 0, &dropbear_sha1_96, 1, NULL},
228
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161 #endif
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162 #ifdef DROPBEAR_SHA1_HMAC
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163 {"hmac-sha1", 0, &dropbear_sha1, 1, NULL},
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164 #endif
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165 #ifdef DROPBEAR_MD5_HMAC
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166 {"hmac-md5", 0, &dropbear_md5, 1, NULL},
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167 #endif
502
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168 {NULL, 0, NULL, 0, NULL}
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169 };
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170
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171 #ifndef DISABLE_ZLIB
575
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172 algo_type ssh_compress[] = {
502
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173 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1, NULL},
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174 {"[email protected]", DROPBEAR_COMP_ZLIB_DELAY, NULL, 1, NULL},
575
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175 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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176 {NULL, 0, NULL, 0, NULL}
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177 };
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178 #endif
575
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179
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180 algo_type ssh_nocompress[] = {
502
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181 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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182 {NULL, 0, NULL, 0, NULL}
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183 };
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184
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185 algo_type sshhostkey[] = {
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186 #ifdef DROPBEAR_RSA
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187 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1, NULL},
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188 #endif
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189 #ifdef DROPBEAR_DSS
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190 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 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 algo_type sshkex[] = {
502
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196 {"diffie-hellman-group1-sha1", DROPBEAR_KEX_DH_GROUP1, NULL, 1, NULL},
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197 {"diffie-hellman-group14-sha1", DROPBEAR_KEX_DH_GROUP14, NULL, 1, NULL},
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198 {NULL, 0, NULL, 0, NULL}
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199 };
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200
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201
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202 /* Register the compiled in ciphers.
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203 * This should be run before using any of the ciphers/hashes */
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204 void crypto_init() {
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205
194
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206 const struct ltc_cipher_descriptor *regciphers[] = {
502
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207 #ifdef DROPBEAR_AES
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208 &aes_desc,
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209 #endif
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210 #ifdef DROPBEAR_BLOWFISH
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211 &blowfish_desc,
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212 #endif
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213 #ifdef DROPBEAR_TWOFISH
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214 &twofish_desc,
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215 #endif
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216 #ifdef DROPBEAR_3DES
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217 &des3_desc,
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218 #endif
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219 NULL
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220 };
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221
194
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222 const struct ltc_hash_descriptor *reghashes[] = {
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223 /* we need sha1 for hostkey stuff regardless */
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224 &sha1_desc,
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225 #ifdef DROPBEAR_MD5_HMAC
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226 &md5_desc,
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227 #endif
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228 NULL
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229 };
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230 int i;
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231
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232 for (i = 0; regciphers[i] != NULL; i++) {
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233 if (register_cipher(regciphers[i]) == -1) {
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234 dropbear_exit("Error registering crypto");
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235 }
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236 }
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237
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238 for (i = 0; reghashes[i] != NULL; i++) {
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239 if (register_hash(reghashes[i]) == -1) {
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240 dropbear_exit("Error registering crypto");
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241 }
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242 }
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243 }
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244
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245 /* algolen specifies the length of algo, algos is our local list to match
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246 * against.
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247 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
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248 * otherwise */
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249 int have_algo(char* algo, size_t algolen, algo_type algos[]) {
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250
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251 int i;
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252
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253 for (i = 0; algos[i].name != NULL; i++) {
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254 if (strlen(algos[i].name) == algolen
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255 && (strncmp(algos[i].name, algo, algolen) == 0)) {
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256 return DROPBEAR_SUCCESS;
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257 }
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258 }
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259
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260 return DROPBEAR_FAILURE;
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261 }
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262
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263 /* Output a comma separated list of algorithms to a buffer */
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264 void buf_put_algolist(buffer * buf, algo_type localalgos[]) {
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265
238
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266 unsigned int i, len;
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267 unsigned int donefirst = 0;
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268 buffer *algolist = NULL;
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269
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270 algolist = buf_new(160);
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271 for (i = 0; localalgos[i].name != NULL; i++) {
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272 if (localalgos[i].usable) {
238
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273 if (donefirst)
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274 buf_putbyte(algolist, ',');
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275 donefirst = 1;
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276 len = strlen(localalgos[i].name);
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277 buf_putbytes(algolist, localalgos[i].name, len);
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278 }
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279 }
238
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280 buf_putstring(buf, algolist->data, algolist->len);
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281 buf_free(algolist);
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282 }
682
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283
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284 #ifdef ENABLE_USER_ALGO_LIST
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285
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286 char *
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287 algolist_string(algo_type algos[])
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288 {
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289 char *ret_list;
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290 buffer *b = buf_new(200);
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291 buf_put_algolist(b, algos);
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292 buf_setpos(b, b->len);
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293 buf_putbyte(b, '\0');
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294 buf_setpos(b, 4);
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295 ret_list = m_strdup(buf_getptr(b, b->len - b->pos));
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296 buf_free(b);
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297 return ret_list;
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298 }
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299
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300 static int
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301 check_algo(const char* algo_name, algo_type *algos)
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302 {
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303 algo_type *a;
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304 for (a = algos; a->name != NULL; a++)
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305 {
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306 if (strcmp(a->name, algo_name) == 0)
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307 {
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308 a->usable = 2;
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309 return DROPBEAR_SUCCESS;
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310 }
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311 }
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312
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313 return DROPBEAR_FAILURE;
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314 }
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315
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316 /* helper for check_user_algos */
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317 static void
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318 try_add_algo(const char *algo_name, algo_type *algos,
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319 const char *algo_desc, char ** out_list, int *num_ret)
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320 {
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321 if (check_algo(algo_name, algos) == DROPBEAR_FAILURE)
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322 {
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323 dropbear_log(LOG_WARNING, "This Dropbear program does not support '%s' %s algorithm", algo_name, algo_desc);
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324 return;
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325 }
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326
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327 if (*num_ret != 0)
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328 {
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329 **out_list = ',';
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330 (*out_list)++;
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331 }
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332
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333 *out_list += sprintf(*out_list, "%s", algo_name);
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334 (*num_ret)++;
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335 }
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336
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337 /* Checks a user provided comma-separated algorithm list for available
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338 * options. Any that are not acceptable are removed in-place. Returns the
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339 * number of valid algorithms. */
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340 int
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341 check_user_algos(char* user_algo_list, algo_type * algos,
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342 const char *algo_desc)
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343 {
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344 /* this has two passes. first we sweep through the given list of
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345 * algorithms and mark them as usable=2 in the algo_type[] array... */
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346 int num_ret = 0;
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347 char *work_list = m_strdup(user_algo_list);
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348 char *last_name = work_list;
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349 char *out_list = user_algo_list;
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350 char *c;
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351 for (c = work_list; *c; c++)
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352 {
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353 if (*c == ',')
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354 {
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355 *c = '\0';
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356 try_add_algo(last_name, algos, algo_desc, &out_list, &num_ret);
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357 last_name = c++;
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358 }
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359 }
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360 try_add_algo(last_name, algos, algo_desc, &out_list, &num_ret);
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361 m_free(work_list);
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362
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363 /* ...then we mark anything with usable==1 as usable=0, and
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364 * usable==2 as usable=1. */
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365 algo_type *a;
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366 for (a = algos; a->name != NULL; a++)
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367 {
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368 if (a->usable == 1)
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369 {
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370 a->usable = 0;
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371 } else if (a->usable == 2)
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372 {
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373 a->usable = 1;
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374 }
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375 }
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376 return num_ret;
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377 }
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378 #endif // ENABLE_USER_ALGO_LIST