Mercurial > dropbear

annotate common-algo.c @ 686:983a817f8e41 insecure-nocrypto

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- Only request "none" cipher after auth has succeeded
author Matt Johnston <matt@ucc.asn.au>
date Thu, 17 May 2012 20:52:57 +0800
parents c37857676924
children cd3d3c63d189
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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_SHA2_256_HMAC
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110 static const struct dropbear_hash dropbear_sha2_256 =
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111 {&sha256_desc, 32, 32};
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112 #endif
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113 #ifdef DROPBEAR_SHA2_512_HMAC
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114 static const struct dropbear_hash dropbear_sha2_512 =
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115 {&sha512_desc, 64, 64};
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116 #endif
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117 #ifdef DROPBEAR_MD5_HMAC
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118 static const struct dropbear_hash dropbear_md5 =
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119 {&md5_desc, 16, 16};
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120 #endif
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121
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122 const struct dropbear_hash dropbear_nohash =
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123 {NULL, 16, 0}; /* used initially */
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124
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125
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126 /* The following map ssh names to internal values.
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127 * The ordering here is important for the client - the first mode
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128 * that is also supported by the server will get used. */
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129
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130 algo_type sshciphers[] = {
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131 #ifdef DROPBEAR_ENABLE_CTR_MODE
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132 #ifdef DROPBEAR_AES128
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133 {"aes128-ctr", 0, &dropbear_aes128, 1, &dropbear_mode_ctr},
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134 #endif
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135 #ifdef DROPBEAR_3DES
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136 {"3des-ctr", 0, &dropbear_3des, 1, &dropbear_mode_ctr},
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137 #endif
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138 #ifdef DROPBEAR_AES256
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139 {"aes256-ctr", 0, &dropbear_aes256, 1, &dropbear_mode_ctr},
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140 #endif
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141 #endif /* DROPBEAR_ENABLE_CTR_MODE */
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142
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143 /* CBC modes are always enabled */
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144 #ifdef DROPBEAR_AES128
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145 {"aes128-cbc", 0, &dropbear_aes128, 1, &dropbear_mode_cbc},
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146 #endif
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147 #ifdef DROPBEAR_3DES
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148 {"3des-cbc", 0, &dropbear_3des, 1, &dropbear_mode_cbc},
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149 #endif
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150 #ifdef DROPBEAR_AES256
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151 {"aes256-cbc", 0, &dropbear_aes256, 1, &dropbear_mode_cbc},
235
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152 #endif
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153 #ifdef DROPBEAR_TWOFISH256
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154 {"twofish256-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
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155 {"twofish-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
235
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156 #endif
502
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157 #ifdef DROPBEAR_TWOFISH128
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158 {"twofish128-cbc", 0, &dropbear_twofish128, 1, &dropbear_mode_cbc},
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159 #endif
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160 #ifdef DROPBEAR_BLOWFISH
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161 {"blowfish-cbc", 0, &dropbear_blowfish, 1, &dropbear_mode_cbc},
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162 #endif
252
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163 #ifdef DROPBEAR_NONE_CIPHER
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164 {"none", 0, (void*)&dropbear_nocipher, 1, &dropbear_mode_none},
252
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165 #endif
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166 {NULL, 0, NULL, 0, NULL}
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167 };
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168
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169 algo_type sshhashes[] = {
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170 #ifdef DROPBEAR_SHA2_256_HMAC
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171 // {"hmac-sha2-256", 0, &dropbear_sha2_256, 1, NULL},
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172 #endif
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173 #ifdef DROPBEAR_SHA2_512_HMAC
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174 // {"hmac-sha2-512", 0, &dropbear_sha2_512, 1, NULL},
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175 #endif
228
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176 #ifdef DROPBEAR_SHA1_96_HMAC
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177 {"hmac-sha1-96", 0, &dropbear_sha1_96, 1, NULL},
228
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178 #endif
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179 #ifdef DROPBEAR_SHA1_HMAC
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180 {"hmac-sha1", 0, &dropbear_sha1, 1, NULL},
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181 #endif
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182 #ifdef DROPBEAR_MD5_HMAC
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183 {"hmac-md5", 0, (void*)&dropbear_md5, 1, NULL},
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184 #endif
252
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185 #ifdef DROPBEAR_NONE_INTEGRITY
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186 {"none", 0, (void*)&dropbear_nohash, 1, NULL},
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187 #endif
502
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188 {NULL, 0, NULL, 0, NULL}
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189 };
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190
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191 #ifndef DISABLE_ZLIB
575
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192 algo_type ssh_compress[] = {
502
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193 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1, NULL},
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194 {"[email protected]", DROPBEAR_COMP_ZLIB_DELAY, NULL, 1, NULL},
575
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195 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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196 {NULL, 0, NULL, 0, NULL}
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197 };
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198 #endif
575
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199
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200 algo_type ssh_nocompress[] = {
502
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201 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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202 {NULL, 0, NULL, 0, NULL}
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203 };
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204
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205 algo_type sshhostkey[] = {
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206 #ifdef DROPBEAR_RSA
502
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207 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1, NULL},
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208 #endif
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209 #ifdef DROPBEAR_DSS
502
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210 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1, NULL},
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211 #endif
502
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212 {NULL, 0, NULL, 0, NULL}
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213 };
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214
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215 algo_type sshkex[] = {
502
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216 {"diffie-hellman-group1-sha1", DROPBEAR_KEX_DH_GROUP1, NULL, 1, NULL},
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217 {"diffie-hellman-group14-sha1", DROPBEAR_KEX_DH_GROUP14, NULL, 1, NULL},
502
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218 {NULL, 0, NULL, 0, NULL}
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219 };
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220
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221
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222 /* Register the compiled in ciphers.
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223 * This should be run before using any of the ciphers/hashes */
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224 void crypto_init() {
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225
194
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226 const struct ltc_cipher_descriptor *regciphers[] = {
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227 #ifdef DROPBEAR_AES
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228 &aes_desc,
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229 #endif
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230 #ifdef DROPBEAR_BLOWFISH
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231 &blowfish_desc,
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232 #endif
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233 #ifdef DROPBEAR_TWOFISH
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234 &twofish_desc,
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235 #endif
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236 #ifdef DROPBEAR_3DES
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237 &des3_desc,
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238 #endif
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239 NULL
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240 };
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241
194
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242 const struct ltc_hash_descriptor *reghashes[] = {
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243 /* we need sha1 for hostkey stuff regardless */
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244 &sha1_desc,
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245 #ifdef DROPBEAR_MD5_HMAC
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246 &md5_desc,
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247 #endif
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248 NULL
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249 };
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250 int i;
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251
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252 for (i = 0; regciphers[i] != NULL; i++) {
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253 if (register_cipher(regciphers[i]) == -1) {
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254 dropbear_exit("Error registering crypto");
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255 }
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256 }
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257
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258 for (i = 0; reghashes[i] != NULL; i++) {
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259 if (register_hash(reghashes[i]) == -1) {
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260 dropbear_exit("Error registering crypto");
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261 }
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262 }
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263 }
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264
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265 /* algolen specifies the length of algo, algos is our local list to match
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266 * against.
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267 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
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268 * otherwise */
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269 int have_algo(char* algo, size_t algolen, algo_type algos[]) {
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270
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271 int i;
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272
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273 for (i = 0; algos[i].name != NULL; i++) {
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274 if (strlen(algos[i].name) == algolen
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275 && (strncmp(algos[i].name, algo, algolen) == 0)) {
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276 return DROPBEAR_SUCCESS;
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277 }
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278 }
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279
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280 return DROPBEAR_FAILURE;
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281 }
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282
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283 /* Output a comma separated list of algorithms to a buffer */
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284 void buf_put_algolist(buffer * buf, algo_type localalgos[]) {
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285
238
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286 unsigned int i, len;
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287 unsigned int donefirst = 0;
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288 buffer *algolist = NULL;
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289
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290 algolist = buf_new(160);
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291 for (i = 0; localalgos[i].name != NULL; i++) {
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292 if (localalgos[i].usable) {
238
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diff changeset
293 if (donefirst)
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294 buf_putbyte(algolist, ',');
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diff changeset
295 donefirst = 1;
4
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296 len = strlen(localalgos[i].name);
238
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diff changeset
297 buf_putbytes(algolist, localalgos[i].name, len);
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298 }
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299 }
238
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300 buf_putstring(buf, algolist->data, algolist->len);
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301 buf_free(algolist);
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302 }
682
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303
686
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304 #ifdef DROPBEAR_NONE_CIPHER
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305
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306 void
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307 set_algo_usable(algo_type algos[], const char * algo_name, int usable)
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308 {
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309 algo_type *a;
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310 for (a = algos; a->name != NULL; a++)
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311 {
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312 if (strcmp(a->name, algo_name) == 0)
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313 {
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314 a->usable = usable;
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315 return;
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316 }
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317 }
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318 }
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319
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320 int
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321 get_algo_usable(algo_type algos[], const char * algo_name)
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322 {
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323 algo_type *a;
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324 for (a = algos; a->name != NULL; a++)
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325 {
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diff changeset
326 if (strcmp(a->name, algo_name) == 0)
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327 {
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328 return a->usable;
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329 }
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330 }
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331 return 0;
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diff changeset
332 }
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333
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diff changeset
334 #endif // DROPBEAR_NONE_CIPHER
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335
682
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336 #ifdef ENABLE_USER_ALGO_LIST
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337
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338 char *
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diff changeset
339 algolist_string(algo_type algos[])
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340 {
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341 char *ret_list;
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diff changeset
342 buffer *b = buf_new(200);
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diff changeset
343 buf_put_algolist(b, algos);
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diff changeset
344 buf_setpos(b, b->len);
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diff changeset
345 buf_putbyte(b, '\0');
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diff changeset
346 buf_setpos(b, 4);
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diff changeset
347 ret_list = m_strdup(buf_getptr(b, b->len - b->pos));
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diff changeset
348 buf_free(b);
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diff changeset
349 return ret_list;
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diff changeset
350 }
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351
683
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352 static algo_type*
682
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diff changeset
353 check_algo(const char* algo_name, algo_type *algos)
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354 {
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diff changeset
355 algo_type *a;
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diff changeset
356 for (a = algos; a->name != NULL; a++)
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diff changeset
357 {
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diff changeset
358 if (strcmp(a->name, algo_name) == 0)
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diff changeset
359 {
683
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diff changeset
360 return a;
682
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diff changeset
361 }
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diff changeset
362 }
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diff changeset
363
683
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364 return NULL;
682
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diff changeset
365 }
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366
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diff changeset
367 static void
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diff changeset
368 try_add_algo(const char *algo_name, algo_type *algos,
683
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diff changeset
369 const char *algo_desc, algo_type * new_algos, int *num_ret)
682
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diff changeset
370 {
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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diff changeset
371 algo_type *match_algo = check_algo(algo_name, algos);
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diff changeset
372 if (!match_algo)
682
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diff changeset
373 {
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diff changeset
374 dropbear_log(LOG_WARNING, "This Dropbear program does not support '%s' %s algorithm", algo_name, algo_desc);
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diff changeset
375 return;
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diff changeset
376 }
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diff changeset
377
683
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diff changeset
378 new_algos[*num_ret] = *match_algo;
682
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diff changeset
379 (*num_ret)++;
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diff changeset
380 }
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diff changeset
381
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diff changeset
382 /* Checks a user provided comma-separated algorithm list for available
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diff changeset
383 * options. Any that are not acceptable are removed in-place. Returns the
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diff changeset
384 * number of valid algorithms. */
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diff changeset
385 int
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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diff changeset
386 check_user_algos(const char* user_algo_list, algo_type * algos,
682
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diff changeset
387 const char *algo_desc)
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diff changeset
388 {
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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diff changeset
389 algo_type new_algos[MAX_PROPOSED_ALGO];
682
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diff changeset
390 /* this has two passes. first we sweep through the given list of
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diff changeset
391 * algorithms and mark them as usable=2 in the algo_type[] array... */
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diff changeset
392 int num_ret = 0;
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diff changeset
393 char *work_list = m_strdup(user_algo_list);
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diff changeset
394 char *last_name = work_list;
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diff changeset
395 char *c;
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diff changeset
396 for (c = work_list; *c; c++)
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diff changeset
397 {
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parents: 595
diff changeset
398 if (*c == ',')
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diff changeset
399 {
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diff changeset
400 *c = '\0';
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
401 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret);
686
983a817f8e41 - Only request "none" cipher after auth has succeeded
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diff changeset
402 c++;
983a817f8e41 - Only request "none" cipher after auth has succeeded
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parents: 684
diff changeset
403 last_name = c;
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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diff changeset
404 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
405 }
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
406 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret);
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
407 m_free(work_list);
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parents: 595
diff changeset
408
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
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parents: 682
diff changeset
409 new_algos[num_ret].name = NULL;
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
410
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
411 /* 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
412 memcpy(algos, new_algos, sizeof(*new_algos) * (num_ret+1));
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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diff changeset
413 return num_ret;
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
414 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
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parents: 595
diff changeset
415 #endif // ENABLE_USER_ALGO_LIST