annotate common-algo.c @ 1672:3a97f14c0235

Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93) * Add Chacha20-Poly1305 authenticated encryption * Add general AEAD approach. * Add [email protected] algo using LibTomCrypt chacha and poly1305 routines. Chacha20-Poly1305 is generally faster than AES256 on CPU w/o dedicated AES instructions, having the same key size. Compiling in will add ~5,5kB to binary size on x86-64. function old new delta chacha_crypt - 1397 +1397 _poly1305_block - 608 +608 poly1305_done - 595 +595 dropbear_chachapoly_crypt - 457 +457 .rodata 26976 27392 +416 poly1305_process - 290 +290 poly1305_init - 221 +221 chacha_setup - 218 +218 encrypt_packet 1068 1270 +202 dropbear_chachapoly_getlength - 147 +147 decrypt_packet 756 897 +141 chacha_ivctr64 - 137 +137 read_packet 543 637 +94 dropbear_chachapoly_start - 94 +94 read_kex_algos 792 880 +88 chacha_keystream - 69 +69 dropbear_mode_chachapoly - 48 +48 sshciphers 280 320 +40 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_chachapoly_mac - 24 +24 dropbear_chachapoly - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 5388/0) Total: 5388 bytes * Add AES128-GCM and AES256-GCM authenticated encryption * Add general AES-GCM mode. * Add [email protected] and [email protected] algo using LibTomCrypt gcm routines. AES-GCM is combination of AES CTR mode and GHASH, slower than AES-CTR on CPU w/o dedicated AES/GHASH instructions therefore disabled by default. Compiling in will add ~6kB to binary size on x86-64. function old new delta gcm_process - 1060 +1060 .rodata 26976 27808 +832 gcm_gf_mult - 820 +820 gcm_add_aad - 660 +660 gcm_shift_table - 512 +512 gcm_done - 471 +471 gcm_add_iv - 384 +384 gcm_init - 347 +347 dropbear_gcm_crypt - 309 +309 encrypt_packet 1068 1270 +202 decrypt_packet 756 897 +141 gcm_reset - 118 +118 read_packet 543 637 +94 read_kex_algos 792 880 +88 sshciphers 280 360 +80 gcm_mult_h - 80 +80 dropbear_gcm_start - 62 +62 dropbear_mode_gcm - 48 +48 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_ghash - 24 +24 dropbear_gcm_getlength - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 6434/0) Total: 6434 bytes
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 20:50:25 +0500
parents d32bcb5c557d
children e0871128e61f
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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 "dh_groups.h"
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31 #include "ltc_prng.h"
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32 #include "ecc.h"
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33 #include "gcm.h"
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34 #include "chachapoly.h"
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36 /* This file (algo.c) organises the ciphers which can be used, and is used to
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37 * decide which ciphers/hashes/compression/signing to use during key exchange*/
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38
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39 static int void_cipher(const unsigned char* in, unsigned char* out,
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40 unsigned long len, void* UNUSED(cipher_state)) {
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41 if (in != out) {
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42 memmove(out, in, len);
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43 }
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44 return CRYPT_OK;
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45 }
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46
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47 static int void_start(int UNUSED(cipher), const unsigned char* UNUSED(IV),
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48 const unsigned char* UNUSED(key),
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49 int UNUSED(keylen), int UNUSED(num_rounds), void* UNUSED(cipher_state)) {
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50 return CRYPT_OK;
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51 }
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52
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53 /* Mappings for ciphers, parameters are
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54 {&cipher_desc, keysize, blocksize} */
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55
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56 /* Remember to add new ciphers/hashes to regciphers/reghashes too */
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57
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58 #if DROPBEAR_AES256
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59 static const struct dropbear_cipher dropbear_aes256 =
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60 {&aes_desc, 32, 16};
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61 #endif
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62 #if DROPBEAR_AES128
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63 static const struct dropbear_cipher dropbear_aes128 =
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64 {&aes_desc, 16, 16};
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65 #endif
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66 #if DROPBEAR_BLOWFISH
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67 static const struct dropbear_cipher dropbear_blowfish =
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68 {&blowfish_desc, 16, 8};
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69 #endif
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70 #if DROPBEAR_TWOFISH256
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71 static const struct dropbear_cipher dropbear_twofish256 =
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72 {&twofish_desc, 32, 16};
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73 #endif
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74 #if DROPBEAR_TWOFISH128
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75 static const struct dropbear_cipher dropbear_twofish128 =
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76 {&twofish_desc, 16, 16};
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77 #endif
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78 #if DROPBEAR_3DES
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79 static const struct dropbear_cipher dropbear_3des =
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80 {&des3_desc, 24, 8};
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81 #endif
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83 /* used to indicate no encryption, as defined in rfc2410 */
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84 const struct dropbear_cipher dropbear_nocipher =
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85 {NULL, 16, 8};
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86
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87 /* A few void* s are required to silence warnings
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88 * about the symmetric_CBC vs symmetric_CTR cipher_state pointer */
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89 #if DROPBEAR_ENABLE_CBC_MODE
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90 const struct dropbear_cipher_mode dropbear_mode_cbc =
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91 {(void*)cbc_start, (void*)cbc_encrypt, (void*)cbc_decrypt, NULL, NULL, NULL};
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92 #endif /* DROPBEAR_ENABLE_CBC_MODE */
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93
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94 const struct dropbear_cipher_mode dropbear_mode_none =
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95 {void_start, void_cipher, void_cipher, NULL, NULL, NULL};
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96
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97 #if DROPBEAR_ENABLE_CTR_MODE
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98 /* a wrapper to make ctr_start and cbc_start look the same */
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99 static int dropbear_big_endian_ctr_start(int cipher,
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100 const unsigned char *IV,
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101 const unsigned char *key, int keylen,
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102 int num_rounds, symmetric_CTR *ctr) {
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103 return ctr_start(cipher, IV, key, keylen, num_rounds, CTR_COUNTER_BIG_ENDIAN, ctr);
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104 }
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105 const struct dropbear_cipher_mode dropbear_mode_ctr =
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106 {(void*)dropbear_big_endian_ctr_start, (void*)ctr_encrypt, (void*)ctr_decrypt, NULL, NULL, NULL};
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107 #endif /* DROPBEAR_ENABLE_CTR_MODE */
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108
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109 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc.
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110 {&hash_desc, keysize, hashsize} */
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111
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112 #if DROPBEAR_SHA1_HMAC
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113 static const struct dropbear_hash dropbear_sha1 =
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114 {&sha1_desc, 20, 20};
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115 #endif
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116 #if DROPBEAR_SHA1_96_HMAC
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117 static const struct dropbear_hash dropbear_sha1_96 =
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118 {&sha1_desc, 20, 12};
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119 #endif
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120 #if DROPBEAR_SHA2_256_HMAC
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121 static const struct dropbear_hash dropbear_sha2_256 =
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122 {&sha256_desc, 32, 32};
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123 #endif
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124 #if DROPBEAR_SHA2_512_HMAC
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125 static const struct dropbear_hash dropbear_sha2_512 =
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126 {&sha512_desc, 64, 64};
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127 #endif
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128 #if DROPBEAR_MD5_HMAC
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129 static const struct dropbear_hash dropbear_md5 =
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130 {&md5_desc, 16, 16};
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131 #endif
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132
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133 const struct dropbear_hash dropbear_nohash =
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134 {NULL, 16, 0}; /* used initially */
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135
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136
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137 /* The following map ssh names to internal values.
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138 * The ordering here is important for the client - the first mode
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139 * that is also supported by the server will get used. */
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140
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141 algo_type sshciphers[] = {
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142 #if DROPBEAR_CHACHA20POLY1305
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143 {"[email protected]", 0, &dropbear_chachapoly, 1, &dropbear_mode_chachapoly},
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144 #endif
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145
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146 #if DROPBEAR_ENABLE_GCM_MODE
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147 #if DROPBEAR_AES128
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148 {"[email protected]", 0, &dropbear_aes128, 1, &dropbear_mode_gcm},
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149 #endif
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150 #if DROPBEAR_AES256
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151 {"[email protected]", 0, &dropbear_aes256, 1, &dropbear_mode_gcm},
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152 #endif
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153 #endif /* DROPBEAR_ENABLE_GCM_MODE */
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154
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155 #if DROPBEAR_ENABLE_CTR_MODE
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156 #if DROPBEAR_AES128
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157 {"aes128-ctr", 0, &dropbear_aes128, 1, &dropbear_mode_ctr},
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158 #endif
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159 #if DROPBEAR_AES256
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160 {"aes256-ctr", 0, &dropbear_aes256, 1, &dropbear_mode_ctr},
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161 #endif
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162 #if DROPBEAR_TWOFISH_CTR
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163 /* twofish ctr is conditional as it hasn't been tested for interoperability, see options.h */
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164 #if DROPBEAR_TWOFISH256
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165 {"twofish256-ctr", 0, &dropbear_twofish256, 1, &dropbear_mode_ctr},
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166 #endif
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167 #if DROPBEAR_TWOFISH128
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168 {"twofish128-ctr", 0, &dropbear_twofish128, 1, &dropbear_mode_ctr},
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169 #endif
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170 #endif /* DROPBEAR_TWOFISH_CTR */
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171 #endif /* DROPBEAR_ENABLE_CTR_MODE */
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172
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173 #if DROPBEAR_ENABLE_CBC_MODE
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174 #if DROPBEAR_AES128
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175 {"aes128-cbc", 0, &dropbear_aes128, 1, &dropbear_mode_cbc},
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176 #endif
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177 #if DROPBEAR_AES256
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178 {"aes256-cbc", 0, &dropbear_aes256, 1, &dropbear_mode_cbc},
235
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179 #endif
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180 #if DROPBEAR_TWOFISH256
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181 {"twofish256-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
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182 {"twofish-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
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183 #endif
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184 #if DROPBEAR_TWOFISH128
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185 {"twofish128-cbc", 0, &dropbear_twofish128, 1, &dropbear_mode_cbc},
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186 #endif
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187 #if DROPBEAR_3DES
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188 {"3des-ctr", 0, &dropbear_3des, 1, &dropbear_mode_ctr},
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189 #endif
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190 #if DROPBEAR_3DES
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191 {"3des-cbc", 0, &dropbear_3des, 1, &dropbear_mode_cbc},
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192 #endif
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193 #if DROPBEAR_BLOWFISH
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194 {"blowfish-cbc", 0, &dropbear_blowfish, 1, &dropbear_mode_cbc},
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195 #endif
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196 #endif /* DROPBEAR_ENABLE_CBC_MODE */
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197 {NULL, 0, NULL, 0, NULL}
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198 };
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199
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200 algo_type sshhashes[] = {
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201 #if DROPBEAR_SHA1_96_HMAC
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202 {"hmac-sha1-96", 0, &dropbear_sha1_96, 1, NULL},
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203 #endif
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204 #if DROPBEAR_SHA1_HMAC
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205 {"hmac-sha1", 0, &dropbear_sha1, 1, NULL},
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206 #endif
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207 #if DROPBEAR_SHA2_256_HMAC
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208 {"hmac-sha2-256", 0, &dropbear_sha2_256, 1, NULL},
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209 #endif
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210 #if DROPBEAR_SHA2_512_HMAC
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211 {"hmac-sha2-512", 0, &dropbear_sha2_512, 1, NULL},
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212 #endif
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213 #if DROPBEAR_MD5_HMAC
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214 {"hmac-md5", 0, (void*)&dropbear_md5, 1, NULL},
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215 #endif
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216 {NULL, 0, NULL, 0, NULL}
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217 };
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218
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219 #ifndef DISABLE_ZLIB
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220 algo_type ssh_compress[] = {
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221 {"[email protected]", DROPBEAR_COMP_ZLIB_DELAY, NULL, 1, NULL},
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222 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1, NULL},
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223 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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224 {NULL, 0, NULL, 0, NULL}
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225 };
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226
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227 algo_type ssh_delaycompress[] = {
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228 {"[email protected]", DROPBEAR_COMP_ZLIB_DELAY, NULL, 1, NULL},
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229 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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230 {NULL, 0, NULL, 0, NULL}
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231 };
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232 #endif
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233
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234 algo_type ssh_nocompress[] = {
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235 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL},
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236 {NULL, 0, NULL, 0, NULL}
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237 };
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238
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239 algo_type sshhostkey[] = {
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240 #if DROPBEAR_ED25519
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241 {"ssh-ed25519", DROPBEAR_SIGNKEY_ED25519, NULL, 1, NULL},
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242 #endif
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243 #if DROPBEAR_ECDSA
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244 #if DROPBEAR_ECC_256
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245 {"ecdsa-sha2-nistp256", DROPBEAR_SIGNKEY_ECDSA_NISTP256, NULL, 1, NULL},
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246 #endif
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247 #if DROPBEAR_ECC_384
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248 {"ecdsa-sha2-nistp384", DROPBEAR_SIGNKEY_ECDSA_NISTP384, NULL, 1, NULL},
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249 #endif
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250 #if DROPBEAR_ECC_521
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251 {"ecdsa-sha2-nistp521", DROPBEAR_SIGNKEY_ECDSA_NISTP521, NULL, 1, NULL},
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252 #endif
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253 #endif
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254 #if DROPBEAR_RSA
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255 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1, NULL},
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256 #endif
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257 #if DROPBEAR_DSS
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258 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1, NULL},
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259 #endif
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260 {NULL, 0, NULL, 0, NULL}
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261 };
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262
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263 #if DROPBEAR_DH_GROUP1
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264 static const struct dropbear_kex kex_dh_group1 = {DROPBEAR_KEX_NORMAL_DH, dh_p_1, DH_P_1_LEN, NULL, &sha1_desc };
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265 #endif
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266 #if DROPBEAR_DH_GROUP14_SHA1
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267 static const struct dropbear_kex kex_dh_group14_sha1 = {DROPBEAR_KEX_NORMAL_DH, dh_p_14, DH_P_14_LEN, NULL, &sha1_desc };
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268 #endif
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269 #if DROPBEAR_DH_GROUP14_SHA256
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270 static const struct dropbear_kex kex_dh_group14_sha256 = {DROPBEAR_KEX_NORMAL_DH, dh_p_14, DH_P_14_LEN, NULL, &sha256_desc };
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271 #endif
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272 #if DROPBEAR_DH_GROUP16
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273 static const struct dropbear_kex kex_dh_group16_sha512 = {DROPBEAR_KEX_NORMAL_DH, dh_p_16, DH_P_16_LEN, NULL, &sha512_desc };
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274 #endif
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275
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276 /* These can't be const since dropbear_ecc_fill_dp() fills out
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277 ecc_curve at runtime */
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278 #if DROPBEAR_ECDH
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279 #if DROPBEAR_ECC_256
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280 static const struct dropbear_kex kex_ecdh_nistp256 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp256, &sha256_desc };
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281 #endif
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282 #if DROPBEAR_ECC_384
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283 static const struct dropbear_kex kex_ecdh_nistp384 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp384, &sha384_desc };
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284 #endif
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285 #if DROPBEAR_ECC_521
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286 static const struct dropbear_kex kex_ecdh_nistp521 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp521, &sha512_desc };
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287 #endif
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288 #endif /* DROPBEAR_ECDH */
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289
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290 #if DROPBEAR_CURVE25519
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291 /* Referred to directly */
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292 static const struct dropbear_kex kex_curve25519 = {DROPBEAR_KEX_CURVE25519, NULL, 0, NULL, &sha256_desc };
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293 #endif
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294
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295 algo_type sshkex[] = {
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296 #if DROPBEAR_CURVE25519
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297 {"curve25519-sha256", 0, &kex_curve25519, 1, NULL},
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298 {"[email protected]", 0, &kex_curve25519, 1, NULL},
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diff changeset
299 #endif
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300 #if DROPBEAR_ECDH
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301 #if DROPBEAR_ECC_521
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302 {"ecdh-sha2-nistp521", 0, &kex_ecdh_nistp521, 1, NULL},
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303 #endif
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304 #if DROPBEAR_ECC_384
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diff changeset
305 {"ecdh-sha2-nistp384", 0, &kex_ecdh_nistp384, 1, NULL},
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306 #endif
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307 #if DROPBEAR_ECC_256
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308 {"ecdh-sha2-nistp256", 0, &kex_ecdh_nistp256, 1, NULL},
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309 #endif
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diff changeset
310 #endif
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311 #if DROPBEAR_DH_GROUP14_SHA256
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312 {"diffie-hellman-group14-sha256", 0, &kex_dh_group14_sha256, 1, NULL},
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diff changeset
313 #endif
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314 #if DROPBEAR_DH_GROUP14_SHA1
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315 {"diffie-hellman-group14-sha1", 0, &kex_dh_group14_sha1, 1, NULL},
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diff changeset
316 #endif
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317 #if DROPBEAR_DH_GROUP1
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318 {"diffie-hellman-group1-sha1", 0, &kex_dh_group1, 1, NULL},
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319 #endif
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320 #if DROPBEAR_DH_GROUP16
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321 {"diffie-hellman-group16-sha512", 0, &kex_dh_group16_sha512, 1, NULL},
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322 #endif
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323 #if DROPBEAR_KEXGUESS2
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diff changeset
324 {KEXGUESS2_ALGO_NAME, KEXGUESS2_ALGO_ID, NULL, 1, NULL},
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diff changeset
325 #endif
502
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326 {NULL, 0, NULL, 0, NULL}
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327 };
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328
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329 /* algolen specifies the length of algo, algos is our local list to match
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330 * against.
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331 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE
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332 * otherwise */
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diff changeset
333 int have_algo(const char* algo, size_t algolen, const algo_type algos[]) {
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334
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335 int i;
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336
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337 for (i = 0; algos[i].name != NULL; i++) {
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338 if (strlen(algos[i].name) == algolen
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339 && (strncmp(algos[i].name, algo, algolen) == 0)) {
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340 return DROPBEAR_SUCCESS;
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341 }
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342 }
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343
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344 return DROPBEAR_FAILURE;
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345 }
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346
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347 /* Output a comma separated list of algorithms to a buffer */
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diff changeset
348 void buf_put_algolist(buffer * buf, const algo_type localalgos[]) {
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349
238
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diff changeset
350 unsigned int i, len;
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diff changeset
351 unsigned int donefirst = 0;
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diff changeset
352 buffer *algolist = NULL;
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353
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354 algolist = buf_new(300);
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355 for (i = 0; localalgos[i].name != NULL; i++) {
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356 if (localalgos[i].usable) {
238
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diff changeset
357 if (donefirst)
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358 buf_putbyte(algolist, ',');
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diff changeset
359 donefirst = 1;
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360 len = strlen(localalgos[i].name);
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diff changeset
361 buf_putbytes(algolist, (const unsigned char *) localalgos[i].name, len);
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362 }
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363 }
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aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
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diff changeset
364 buf_putstring(buf, (const char*)algolist->data, algolist->len);
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diff changeset
365 TRACE(("algolist add '%*s'", algolist->len, algolist->data))
238
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diff changeset
366 buf_free(algolist);
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367 }
682
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diff changeset
368
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369 /* match the first algorithm in the comma-separated list in buf which is
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diff changeset
370 * also in localalgos[], or return NULL on failure.
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diff changeset
371 * (*goodguess) is set to 1 if the preferred client/server algos match,
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diff changeset
372 * 0 otherwise. This is used for checking if the kexalgo/hostkeyalgos are
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diff changeset
373 * guessed correctly */
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diff changeset
374 algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
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diff changeset
375 enum kexguess2_used *kexguess2, int *goodguess)
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diff changeset
376 {
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diff changeset
377
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diff changeset
378 char * algolist = NULL;
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diff changeset
379 const char *remotenames[MAX_PROPOSED_ALGO], *localnames[MAX_PROPOSED_ALGO];
741
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diff changeset
380 unsigned int len;
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diff changeset
381 unsigned int remotecount, localcount, clicount, servcount, i, j;
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diff changeset
382 algo_type * ret = NULL;
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parents: 1038
diff changeset
383 const char **clinames, **servnames;
741
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diff changeset
384
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diff changeset
385 if (goodguess) {
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diff changeset
386 *goodguess = 0;
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 /* 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
390 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
391 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
392 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
393 goto out;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
394 }
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 /* 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
397 /* 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
398 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
399 remotecount = 1;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
400 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
401 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
402 /* 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
403 goto out;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
404 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
405 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
406 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
407 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
408 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 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
411 break;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
412 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
413 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
414 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
415 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
416 {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
417 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
418 *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
419 break;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
420 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
421 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
422 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
423 *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
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
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
427 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
428 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
429 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
430 } else {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
431 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
432 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
433 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
434 localcount = i;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
435
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
436 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
437 clinames = remotenames;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
438 clicount = remotecount;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
439 servnames = localnames;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
440 servcount = localcount;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
441 } else {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
442 clinames = localnames;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
443 clicount = localcount;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
444 servnames = remotenames;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
445 servcount = remotecount;
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
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
448 /* 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
449 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
450 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
451 if (!(servnames[j] && clinames[i])) {
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
452 /* 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
453 continue;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
454 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
455 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
456 /* 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
457 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
458 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
459 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
460 *goodguess = 1;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
461 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
462
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
463 } else {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
464 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
465 *goodguess = 1;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
466 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
467 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
468 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
469 /* 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
470 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
471 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
472 } else {
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
473 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
474 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
475 goto out;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
476 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
477 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
478 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
479
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
480 out:
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
481 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
482 return ret;
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
483 }
eafdf8b363f5 Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents: 740
diff changeset
484
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1294
diff changeset
485 #if DROPBEAR_USER_ALGO_LIST
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
486
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
487 char *
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1316
diff changeset
488 algolist_string(const 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
489 {
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
490 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
491 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
492 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
493 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
494 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
495 buf_setpos(b, 4);
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 1038
diff changeset
496 ret_list = m_strdup((const char *) buf_getptr(b, b->len - b->pos));
682
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
497 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
498 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
499 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
500
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
501 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
502 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
503 {
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
504 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
505 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
506 {
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
507 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
508 {
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
509 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
510 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
511 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
512
683
63f8d6c469cf ENABLE_USER_ALGO_LIST should work for the client
Matt Johnston <matt@ucc.asn.au>
parents: 682
diff changeset
513 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
514 }
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
515
4edea9f363d0 Add rough support for choosing ciphers/hashes with "-c" or "-m"
Matt Johnston <matt@ucc.asn.au>
parents: 595
diff changeset
516 /* 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>
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517 * options. Any that are not acceptable are removed in-place. Returns the
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518 * number of valid algorithms. */
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519 int
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520 check_user_algos(const char* user_algo_list, algo_type * algos,
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521 const char *algo_desc)
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522 {
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523 algo_type new_algos[MAX_PROPOSED_ALGO+1];
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524 char *work_list = m_strdup(user_algo_list);
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525 char *start = work_list;
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526 char *c;
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527 int n;
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528 /* So we can iterate and look for null terminator */
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529 memset(new_algos, 0x0, sizeof(new_algos));
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530 for (c = work_list, n = 0; ; c++)
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531 {
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532 char oc = *c;
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533 if (n >= MAX_PROPOSED_ALGO) {
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534 dropbear_exit("Too many algorithms '%s'", user_algo_list);
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535 }
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536 if (*c == ',' || *c == '\0') {
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537 algo_type *match_algo = NULL;
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538 *c = '\0';
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539 match_algo = check_algo(start, algos);
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540 if (match_algo) {
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541 if (check_algo(start, new_algos)) {
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542 TRACE(("Skip repeated algorithm '%s'", start))
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543 } else {
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544 new_algos[n] = *match_algo;
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545 n++;
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546 }
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547 } else {
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548 dropbear_log(LOG_WARNING, "This Dropbear program does not support '%s' %s algorithm", start, algo_desc);
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549 }
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983a817f8e41 - Only request "none" cipher after auth has succeeded
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550 c++;
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551 start = c;
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552 }
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553 if (oc == '\0') {
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554 break;
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555 }
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556 }
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557 m_free(work_list);
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558 /* n+1 to include a null terminator */
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559 memcpy(algos, new_algos, sizeof(*new_algos) * (n+1));
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560 return n;
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561 }
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750ec4ec4cbe Convert #ifdef to #if, other build changes
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parents: 1294
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562 #endif /* DROPBEAR_USER_ALGO_LIST */