Mercurial > dropbear

annotate common-algo.c @ 1060:4c733310c21d nocircbuffer

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reword comment for clarity
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 23:26:42 +0800
parents d3925ed45a85
children 1e486f368ec3 c45d65392c1a
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * Copyright (c) 2004 by Mihnea Stoenescu
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6 * All rights reserved.
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7 *
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy
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9 * of this software and associated documentation files (the "Software"), to deal
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10 * in the Software without restriction, including without limitation the rights
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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12 * copies of the Software, and to permit persons to whom the Software is
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13 * furnished to do so, subject to the following conditions:
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14 *
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15 * The above copyright notice and this permission notice shall be included in
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16 * all copies or substantial portions of the Software.
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17 *
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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24 * SOFTWARE. */
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25
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26 #include "includes.h"
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27 #include "algo.h"
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28 #include "session.h"
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29 #include "dbutil.h"
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30 #include "kex.h"
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31 #include "ltc_prng.h"
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32 #include "ecc.h"
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33
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34 /* This file (algo.c) organises the ciphers which can be used, and is used to
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35 * decide which ciphers/hashes/compression/signing to use during key exchange*/
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36
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37 static int void_cipher(const unsigned char* in, unsigned char* out,
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38 unsigned long len, void* UNUSED(cipher_state)) {
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39 if (in != out) {
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40 memmove(out, in, len);
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41 }
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42 return CRYPT_OK;
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43 }
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44
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45 static int void_start(int UNUSED(cipher), const unsigned char* UNUSED(IV),
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46 const unsigned char* UNUSED(key),
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47 int UNUSED(keylen), int UNUSED(num_rounds), void* UNUSED(cipher_state)) {
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48 return CRYPT_OK;
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49 }
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50
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51 /* Mappings for ciphers, parameters are
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52 {&cipher_desc, keysize, blocksize} */
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53
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54 /* Remember to add new ciphers/hashes to regciphers/reghashes too */
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55
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56 #ifdef DROPBEAR_AES256
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57 static const struct dropbear_cipher dropbear_aes256 =
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58 {&aes_desc, 32, 16};
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59 #endif
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60 #ifdef DROPBEAR_AES128
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61 static const struct dropbear_cipher dropbear_aes128 =
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62 {&aes_desc, 16, 16};
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63 #endif
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64 #ifdef DROPBEAR_BLOWFISH
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65 static const struct dropbear_cipher dropbear_blowfish =
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66 {&blowfish_desc, 16, 8};
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67 #endif
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68 #ifdef DROPBEAR_TWOFISH256
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69 static const struct dropbear_cipher dropbear_twofish256 =
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70 {&twofish_desc, 32, 16};
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71 #endif
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72 #ifdef DROPBEAR_TWOFISH128
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73 static const struct dropbear_cipher dropbear_twofish128 =
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74 {&twofish_desc, 16, 16};
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75 #endif
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76 #ifdef DROPBEAR_3DES
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77 static const struct dropbear_cipher dropbear_3des =
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78 {&des3_desc, 24, 8};
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79 #endif
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80
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81 /* used to indicate no encryption, as defined in rfc2410 */
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82 const struct dropbear_cipher dropbear_nocipher =
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83 {NULL, 16, 8};
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84
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85 /* A few void* s are required to silence warnings
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86 * about the symmetric_CBC vs symmetric_CTR cipher_state pointer */
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87 #ifdef DROPBEAR_ENABLE_CBC_MODE
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88 const struct dropbear_cipher_mode dropbear_mode_cbc =
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89 {(void*)cbc_start, (void*)cbc_encrypt, (void*)cbc_decrypt};
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90 #endif /* DROPBEAR_ENABLE_CBC_MODE */
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91
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92 const struct dropbear_cipher_mode dropbear_mode_none =
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93 {void_start, void_cipher, void_cipher};
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95 #ifdef DROPBEAR_ENABLE_CTR_MODE
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96 /* a wrapper to make ctr_start and cbc_start look the same */
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97 static int dropbear_big_endian_ctr_start(int cipher,
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98 const unsigned char *IV,
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99 const unsigned char *key, int keylen,
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100 int num_rounds, symmetric_CTR *ctr) {
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101 return ctr_start(cipher, IV, key, keylen, num_rounds, CTR_COUNTER_BIG_ENDIAN, ctr);
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102 }
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103 const struct dropbear_cipher_mode dropbear_mode_ctr =
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104 {(void*)dropbear_big_endian_ctr_start, (void*)ctr_encrypt, (void*)ctr_decrypt};
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105 #endif /* DROPBEAR_ENABLE_CTR_MODE */
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106
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107 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc.
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108 {&hash_desc, keysize, hashsize} */
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109
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110 #ifdef DROPBEAR_SHA1_HMAC
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111 static const struct dropbear_hash dropbear_sha1 =
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112 {&sha1_desc, 20, 20};
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113 #endif
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114 #ifdef DROPBEAR_SHA1_96_HMAC
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115 static const struct dropbear_hash dropbear_sha1_96 =
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116 {&sha1_desc, 20, 12};
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117 #endif
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118 #ifdef DROPBEAR_SHA2_256_HMAC
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119 static const struct dropbear_hash dropbear_sha2_256 =
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120 {&sha256_desc, 32, 32};
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121 #endif
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122 #ifdef DROPBEAR_SHA2_512_HMAC
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123 static const struct dropbear_hash dropbear_sha2_512 =
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124 {&sha512_desc, 64, 64};
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125 #endif
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126 #ifdef DROPBEAR_MD5_HMAC
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127 static const struct dropbear_hash dropbear_md5 =
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128 {&md5_desc, 16, 16};
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129 #endif
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130
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131 const struct dropbear_hash dropbear_nohash =
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132 {NULL, 16, 0}; /* used initially */
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133
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134
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135 /* The following map ssh names to internal values.
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136 * The ordering here is important for the client - the first mode
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137 * that is also supported by the server will get used. */
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138
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139 algo_type sshciphers[] = {
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140 #ifdef DROPBEAR_ENABLE_CTR_MODE
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141 #ifdef DROPBEAR_AES128
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142 {"aes128-ctr", 0, &dropbear_aes128, 1, &dropbear_mode_ctr},
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143 #endif
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144 #ifdef DROPBEAR_AES256
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145 {"aes256-ctr", 0, &dropbear_aes256, 1, &dropbear_mode_ctr},
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146 #endif
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147 #ifdef DROPBEAR_TWOFISH256
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148 {"twofish256-ctr", 0, &dropbear_twofish256, 1, &dropbear_mode_ctr},
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149 #endif
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150 #ifdef DROPBEAR_TWOFISH128
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151 {"twofish128-ctr", 0, &dropbear_twofish128, 1, &dropbear_mode_ctr},
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152 #endif
502
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153 #endif /* DROPBEAR_ENABLE_CTR_MODE */
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154
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155 #ifdef DROPBEAR_ENABLE_CBC_MODE
502
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156 #ifdef DROPBEAR_AES128
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157 {"aes128-cbc", 0, &dropbear_aes128, 1, &dropbear_mode_cbc},
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158 #endif
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159 #ifdef DROPBEAR_AES256
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160 {"aes256-cbc", 0, &dropbear_aes256, 1, &dropbear_mode_cbc},
235
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161 #endif
502
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162 #ifdef DROPBEAR_TWOFISH256
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163 {"twofish256-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
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164 {"twofish-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
235
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165 #endif
502
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166 #ifdef DROPBEAR_TWOFISH128
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167 {"twofish128-cbc", 0, &dropbear_twofish128, 1, &dropbear_mode_cbc},
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168 #endif
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169 #ifdef DROPBEAR_3DES
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170 {"3des-ctr", 0, &dropbear_3des, 1, &dropbear_mode_ctr},
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171 #endif
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172 #ifdef DROPBEAR_3DES
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173 {"3des-cbc", 0, &dropbear_3des, 1, &dropbear_mode_cbc},
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174 #endif
502
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175 #ifdef DROPBEAR_BLOWFISH
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176 {"blowfish-cbc", 0, &dropbear_blowfish, 1, &dropbear_mode_cbc},
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177 #endif
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178 #endif /* DROPBEAR_ENABLE_CBC_MODE */
252
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179 #ifdef DROPBEAR_NONE_CIPHER
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180 {"none", 0, (void*)&dropbear_nocipher, 1, &dropbear_mode_none},
252
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181 #endif
502
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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 sshhashes[] = {
1017
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186 #ifdef DROPBEAR_SHA1_96_HMAC
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187 {"hmac-sha1-96", 0, &dropbear_sha1_96, 1, NULL},
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188 #endif
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189 #ifdef DROPBEAR_SHA1_HMAC
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190 {"hmac-sha1", 0, &dropbear_sha1, 1, NULL},
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191 #endif
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192 #ifdef DROPBEAR_SHA2_256_HMAC
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193 {"hmac-sha2-256", 0, &dropbear_sha2_256, 1, NULL},
679
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194 #endif
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195 #ifdef DROPBEAR_SHA2_512_HMAC
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196 {"hmac-sha2-512", 0, &dropbear_sha2_512, 1, NULL},
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197 #endif
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198 #ifdef DROPBEAR_MD5_HMAC
681
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diff changeset
199 {"hmac-md5", 0, (void*)&dropbear_md5, 1, NULL},
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200 #endif
252
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diff changeset
201 #ifdef DROPBEAR_NONE_INTEGRITY
681
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202 {"none", 0, (void*)&dropbear_nohash, 1, NULL},
4
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203 #endif
502
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204 {NULL, 0, NULL, 0, NULL}
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205 };
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206
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207 #ifndef DISABLE_ZLIB
575
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diff changeset
208 algo_type ssh_compress[] = {
994
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diff changeset
209 {"[email protected]", DROPBEAR_COMP_ZLIB_DELAY, NULL, 1, NULL},
502
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diff changeset
210 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1, NULL},
575
f9b5dc0cba61 - Disable compression for non-final multihops
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211 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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diff changeset
212 {NULL, 0, NULL, 0, NULL}
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213 };
996
47643024fc90 Disable non-delayed zlib for server
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diff changeset
214
47643024fc90 Disable non-delayed zlib for server
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diff changeset
215 algo_type ssh_delaycompress[] = {
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diff changeset
216 {"[email protected]", DROPBEAR_COMP_ZLIB_DELAY, NULL, 1, NULL},
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217 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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diff changeset
218 {NULL, 0, NULL, 0, NULL}
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219 };
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220 #endif
575
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diff changeset
221
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diff changeset
222 algo_type ssh_nocompress[] = {
502
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diff changeset
223 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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diff changeset
224 {NULL, 0, NULL, 0, NULL}
4
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225 };
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226
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227 algo_type sshhostkey[] = {
795
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diff changeset
228 #ifdef DROPBEAR_ECDSA
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diff changeset
229 #ifdef DROPBEAR_ECC_256
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diff changeset
230 {"ecdsa-sha2-nistp256", DROPBEAR_SIGNKEY_ECDSA_NISTP256, NULL, 1, NULL},
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parents: 766
diff changeset
231 #endif
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diff changeset
232 #ifdef DROPBEAR_ECC_384
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diff changeset
233 {"ecdsa-sha2-nistp384", DROPBEAR_SIGNKEY_ECDSA_NISTP384, NULL, 1, NULL},
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parents: 766
diff changeset
234 #endif
7f604f9b3756 ecdsa is working
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diff changeset
235 #ifdef DROPBEAR_ECC_521
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diff changeset
236 {"ecdsa-sha2-nistp521", DROPBEAR_SIGNKEY_ECDSA_NISTP521, NULL, 1, NULL},
7f604f9b3756 ecdsa is working
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diff changeset
237 #endif
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diff changeset
238 #endif
4
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diff changeset
239 #ifdef DROPBEAR_RSA
502
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diff changeset
240 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1, NULL},
4
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diff changeset
241 #endif
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242 #ifdef DROPBEAR_DSS
502
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diff changeset
243 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1, NULL},
4
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diff changeset
244 #endif
502
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diff changeset
245 {NULL, 0, NULL, 0, NULL}
4
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246 };
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247
848
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diff changeset
248 static const struct dropbear_kex kex_dh_group1 = {DROPBEAR_KEX_NORMAL_DH, dh_p_1, DH_P_1_LEN, NULL, &sha1_desc };
6c69e7df3621 curve25519
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diff changeset
249 static const struct dropbear_kex kex_dh_group14 = {DROPBEAR_KEX_NORMAL_DH, dh_p_14, DH_P_14_LEN, NULL, &sha1_desc };
756
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diff changeset
250
852
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diff changeset
251 /* These can't be const since dropbear_ecc_fill_dp() fills out
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diff changeset
252 ecc_curve at runtime */
761
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diff changeset
253 #ifdef DROPBEAR_ECDH
756
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diff changeset
254 #ifdef DROPBEAR_ECC_256
848
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diff changeset
255 static struct dropbear_kex kex_ecdh_nistp256 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp256, &sha256_desc };
756
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diff changeset
256 #endif
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diff changeset
257 #ifdef DROPBEAR_ECC_384
848
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diff changeset
258 static struct dropbear_kex kex_ecdh_nistp384 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp384, &sha384_desc };
756
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diff changeset
259 #endif
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diff changeset
260 #ifdef DROPBEAR_ECC_521
848
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diff changeset
261 static struct dropbear_kex kex_ecdh_nistp521 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp521, &sha512_desc };
756
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diff changeset
262 #endif
848
6c69e7df3621 curve25519
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diff changeset
263 #endif /* DROPBEAR_ECDH */
756
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diff changeset
264
848
6c69e7df3621 curve25519
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diff changeset
265 #ifdef DROPBEAR_CURVE25519
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diff changeset
266 /* Referred to directly */
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diff changeset
267 static const struct dropbear_kex kex_curve25519 = {DROPBEAR_KEX_CURVE25519, NULL, 0, NULL, &sha256_desc };
848
6c69e7df3621 curve25519
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diff changeset
268 #endif
756
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269
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270 algo_type sshkex[] = {
848
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diff changeset
271 #ifdef DROPBEAR_CURVE25519
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272 {"[email protected]", 0, &kex_curve25519, 1, NULL},
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diff changeset
273 #endif
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diff changeset
274 #ifdef DROPBEAR_ECDH
840
5128e525c8fa Default to some larger key sizes
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parents: 801
diff changeset
275 #ifdef DROPBEAR_ECC_521
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diff changeset
276 {"ecdh-sha2-nistp521", 0, &kex_ecdh_nistp521, 1, NULL},
756
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diff changeset
277 #endif
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diff changeset
278 #ifdef DROPBEAR_ECC_384
762
a78a38e402d1 - Fix various hardcoded uses of SHA1
Matt Johnston <matt@ucc.asn.au>
parents: 761
diff changeset
279 {"ecdh-sha2-nistp384", 0, &kex_ecdh_nistp384, 1, NULL},
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
280 #endif
840
5128e525c8fa Default to some larger key sizes
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
281 #ifdef DROPBEAR_ECC_256
5128e525c8fa Default to some larger key sizes
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
282 {"ecdh-sha2-nistp256", 0, &kex_ecdh_nistp256, 1, NULL},
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
283 #endif
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
284 #endif
994
5c5ade336926 Prefer stronger algorithms in algorithm negotiation.
Fedor Brunner <fedor.brunner@azet.sk>
parents: 992
diff changeset
285 {"diffie-hellman-group14-sha1", 0, &kex_dh_group14, 1, NULL},
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
286 {"diffie-hellman-group1-sha1", 0, &kex_dh_group1, 1, NULL},
746
465fefc4f6e0 Put some #ifdef options around first-follows options in case they
Matt Johnston <matt@ucc.asn.au>
parents: 745
diff changeset
287 #ifdef USE_KEXGUESS2
740
3062da90dab8 Add kexguess2 behaviour
Matt Johnston <matt@ucc.asn.au>
parents: 715
diff changeset
288 {KEXGUESS2_ALGO_NAME, KEXGUESS2_ALGO_ID, NULL, 1, NULL},
746
465fefc4f6e0 Put some #ifdef options around first-follows options in case they
Matt Johnston <matt@ucc.asn.au>
parents: 745
diff changeset
289 #endif
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
290 {NULL, 0, NULL, 0, NULL}
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
291 };
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
292
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
293 /* algolen specifies the length of algo, algos is our local list to match
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
294 * against.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
295 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
296 * otherwise */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
297 int have_algo(char* algo, size_t algolen, algo_type algos[]) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
298
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
299 int i;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
300
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
301 for (i = 0; algos[i].name != NULL; i++) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
302 if (strlen(algos[i].name) == algolen
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
303 && (strncmp(algos[i].name, algo, algolen) == 0)) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
304 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
305 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
306 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
307
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
308 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
309 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
310
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
311 /* Output a comma separated list of algorithms to a buffer */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
312 void buf_put_algolist(buffer * buf, algo_type localalgos[]) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
313
238
e923801a7678 use a buffer rather than raw char array for creating
Matt Johnston <matt@ucc.asn.au>
parents: 237
diff changeset
314 unsigned int i, len;
e923801a7678 use a buffer rather than raw char array for creating
Matt Johnston <matt@ucc.asn.au>
parents: 237
diff changeset
315 unsigned int donefirst = 0;
e923801a7678 use a buffer rather than raw char array for creating
Matt Johnston <matt@ucc.asn.au>
parents: 237
diff changeset
316 buffer *algolist = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
317
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 840
diff changeset
318 algolist = buf_new(200);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
319 for (i = 0; localalgos[i].name != NULL; i++) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
320 if (localalgos[i].usable) {
238
e923801a7678 use a buffer rather than raw char array for creating
Matt Johnston <matt@ucc.asn.au>
parents: 237
diff changeset
321 if (donefirst)
e923801a7678 use a buffer rather than raw char array for creating
Matt Johnston <matt@ucc.asn.au>
parents: 237
diff changeset
322 buf_putbyte(algolist, ',');
e923801a7678 use a buffer rather than raw char array for creating
Matt Johnston <matt@ucc.asn.au>
parents: 237
diff changeset
323 donefirst = 1;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
324 len = strlen(localalgos[i].name);
238
e923801a7678 use a buffer rather than raw char array for creating
Matt Johnston <matt@ucc.asn.au>
parents: 237
diff changeset
325 buf_putbytes(algolist, localalgos[i].name, len);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
326 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
327 }
238
e923801a7678 use a buffer rather than raw char array for creating
Matt Johnston <matt@ucc.asn.au>
parents: 237
diff changeset
328 buf_putstring(buf, algolist->data, algolist->len);
e923801a7678 use a buffer rather than raw char array for creating
Matt Johnston <matt@ucc.asn.au>
parents: 237
diff changeset
329 buf_free(algolist);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
330 }
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
331
741
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
332 /* match the first algorithm in the comma-separated list in buf which is
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
333 * also in localalgos[], or return NULL on failure.
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
334 * (*goodguess) is set to 1 if the preferred client/server algos match,
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
335 * 0 otherwise. This is used for checking if the kexalgo/hostkeyalgos are
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
336 * guessed correctly */
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
337 algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
338 enum kexguess2_used *kexguess2, int *goodguess)
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
339 {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
340
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
341 unsigned char * algolist = NULL;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
342 const unsigned char *remotenames[MAX_PROPOSED_ALGO], *localnames[MAX_PROPOSED_ALGO];
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
343 unsigned int len;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
344 unsigned int remotecount, localcount, clicount, servcount, i, j;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
345 algo_type * ret = NULL;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
346 const unsigned char **clinames, **servnames;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
347
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
348 if (goodguess) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
349 *goodguess = 0;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
350 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
351
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
352 /* get the comma-separated list from the buffer ie "algo1,algo2,algo3" */
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
353 algolist = buf_getstring(buf, &len);
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
354 TRACE(("buf_match_algo: %s", algolist))
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
355 if (len > MAX_PROPOSED_ALGO*(MAX_NAME_LEN+1)) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
356 goto out;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
357 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
358
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
359 /* remotenames will contain a list of the strings parsed out */
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
360 /* We will have at least one string (even if it's just "") */
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
361 remotenames[0] = algolist;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
362 remotecount = 1;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
363 for (i = 0; i < len; i++) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
364 if (algolist[i] == '\0') {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
365 /* someone is trying something strange */
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
366 goto out;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
367 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
368 if (algolist[i] == ',') {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
369 algolist[i] = '\0';
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
370 remotenames[remotecount] = &algolist[i+1];
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
371 remotecount++;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
372 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
373 if (remotecount >= MAX_PROPOSED_ALGO) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
374 break;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
375 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
376 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
377 if (kexguess2 && *kexguess2 == KEXGUESS2_LOOK) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
378 for (i = 0; i < remotecount; i++)
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
379 {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
380 if (strcmp(remotenames[i], KEXGUESS2_ALGO_NAME) == 0) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
381 *kexguess2 = KEXGUESS2_YES;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
382 break;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
383 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
384 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
385 if (*kexguess2 == KEXGUESS2_LOOK) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
386 *kexguess2 = KEXGUESS2_NO;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
387 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
388 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
389
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
390 for (i = 0; localalgos[i].name != NULL; i++) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
391 if (localalgos[i].usable) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
392 localnames[i] = localalgos[i].name;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
393 } else {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
394 localnames[i] = NULL;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
395 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
396 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
397 localcount = i;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
398
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
399 if (IS_DROPBEAR_SERVER) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
400 clinames = remotenames;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
401 clicount = remotecount;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
402 servnames = localnames;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
403 servcount = localcount;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
404 } else {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
405 clinames = localnames;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
406 clicount = localcount;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
407 servnames = remotenames;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
408 servcount = remotecount;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
409 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
410
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
411 /* iterate and find the first match */
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
412 for (i = 0; i < clicount; i++) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
413 for (j = 0; j < servcount; j++) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
414 if (!(servnames[j] && clinames[i])) {
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
415 /* unusable algos are NULL */
741
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
416 continue;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
417 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
418 if (strcmp(servnames[j], clinames[i]) == 0) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
419 /* set if it was a good guess */
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
420 if (goodguess && kexguess2) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
421 if (*kexguess2 == KEXGUESS2_YES) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
422 if (i == 0) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
423 *goodguess = 1;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
424 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
425
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
426 } else {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
427 if (i == 0 && j == 0) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
428 *goodguess = 1;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
429 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
430 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
431 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
432 /* set the algo to return */
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
433 if (IS_DROPBEAR_SERVER) {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
434 ret = &localalgos[j];
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
435 } else {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
436 ret = &localalgos[i];
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
437 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
438 goto out;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
439 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
440 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
441 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
442
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
443 out:
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
444 m_free(algolist);
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
445 return ret;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
446 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
447
686
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
448 #ifdef DROPBEAR_NONE_CIPHER
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
449
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
450 void
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
451 set_algo_usable(algo_type algos[], const char * algo_name, int usable)
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
452 {
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
453 algo_type *a;
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
454 for (a = algos; a->name != NULL; a++)
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
455 {
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
456 if (strcmp(a->name, algo_name) == 0)
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
457 {
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
458 a->usable = usable;
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
459 return;
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
460 }
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
461 }
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
462 }
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
463
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
464 int
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
465 get_algo_usable(algo_type algos[], const char * algo_name)
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
466 {
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
467 algo_type *a;
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
468 for (a = algos; a->name != NULL; a++)
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
469 {
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
470 if (strcmp(a->name, algo_name) == 0)
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
471 {
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
472 return a->usable;
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
473 }
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
474 }
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
475 return 0;
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
476 }
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
477
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
478 #endif /* DROPBEAR_NONE_CIPHER */
686
983a817f8e41 - Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents: 684
diff changeset
479
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
480 #ifdef ENABLE_USER_ALGO_LIST
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
481
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
482 char *
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
483 algolist_string(algo_type algos[])
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
484 {
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
485 char *ret_list;
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
486 buffer *b = buf_new(200);
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
487 buf_put_algolist(b, algos);
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
488 buf_setpos(b, b->len);
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
489 buf_putbyte(b, '\0');
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
490 buf_setpos(b, 4);
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
491 ret_list = m_strdup(buf_getptr(b, b->len - b->pos));
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
492 buf_free(b);
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
493 return ret_list;
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
494 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
495
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
496 static algo_type*
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
497 check_algo(const char* algo_name, algo_type *algos)
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
498 {
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
499 algo_type *a;
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
500 for (a = algos; a->name != NULL; a++)
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
501 {
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
502 if (strcmp(a->name, algo_name) == 0)
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
503 {
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
504 return a;
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
505 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
506 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
507
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
508 return NULL;
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
509 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
510
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
511 static void
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
512 try_add_algo(const char *algo_name, algo_type *algos,
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
513 const char *algo_desc, algo_type * new_algos, int *num_ret)
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
514 {
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
515 algo_type *match_algo = check_algo(algo_name, algos);
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
516 if (!match_algo)
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
517 {
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
518 dropbear_log(LOG_WARNING, "This Dropbear program does not support '%s' %s algorithm", algo_name, algo_desc);
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
519 return;
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
520 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
521
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
522 new_algos[*num_ret] = *match_algo;
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
523 (*num_ret)++;
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
524 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
525
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
526 /* Checks a user provided comma-separated algorithm list for available
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
527 * options. Any that are not acceptable are removed in-place. Returns the
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
528 * number of valid algorithms. */
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
529 int
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
530 check_user_algos(const char* user_algo_list, algo_type * algos,
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
531 const char *algo_desc)
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
532 {
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
533 algo_type new_algos[MAX_PROPOSED_ALGO];
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
534 /* this has two passes. first we sweep through the given list of
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
535 * algorithms and mark them as usable=2 in the algo_type[] array... */
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
536 int num_ret = 0;
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
537 char *work_list = m_strdup(user_algo_list);
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
538 char *last_name = work_list;
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
539 char *c;
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
540 for (c = work_list; *c; c++)
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
541 {
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
542 if (*c == ',')
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
543 {
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
544 *c = '\0';
683
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diff changeset
545 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret);
686
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546 c++;
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547 last_name = c;
682
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548 }
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549 }
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550 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret);
682
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diff changeset
551 m_free(work_list);
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diff changeset
552
683
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diff changeset
553 new_algos[num_ret].name = NULL;
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554
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parents: 682
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555 /* Copy one more as a blank delimiter */
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556 memcpy(algos, new_algos, sizeof(*new_algos) * (num_ret+1));
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557 return num_ret;
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558 }
857
c19acba28590 use oldstyle comments
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parents: 852
diff changeset
559 #endif /* ENABLE_USER_ALGO_LIST */