Mercurial > dropbear
annotate common-algo.c @ 910:89555751c489 asm
merge up to 2013.63, improve ASM makefile rules a bit
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 27 Feb 2014 21:35:58 +0800 |
parents | 3ca7113936c1 c19acba28590 |
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rev | line source |
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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 #include "crypto_desc.h" |
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34 |
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35 /* This file (algo.c) organises the ciphers which can be used, and is used to |
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36 * decide which ciphers/hashes/compression/signing to use during key exchange*/ |
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37 |
502 | 38 static int void_cipher(const unsigned char* in, unsigned char* out, |
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39 unsigned long len, void* UNUSED(cipher_state)) { |
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40 if (in != out) { |
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41 memmove(out, in, len); |
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42 } |
502 | 43 return CRYPT_OK; |
44 } | |
45 | |
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46 static int void_start(int UNUSED(cipher), const unsigned char* UNUSED(IV), |
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47 const unsigned char* UNUSED(key), |
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48 int UNUSED(keylen), int UNUSED(num_rounds), void* UNUSED(cipher_state)) { |
502 | 49 return CRYPT_OK; |
50 } | |
51 | |
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52 /* Mappings for ciphers, parameters are |
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53 {&cipher_desc, keysize, blocksize} */ |
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54 |
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55 /* Remember to add new ciphers/hashes to regciphers/reghashes too */ |
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56 |
502 | 57 #ifdef DROPBEAR_AES256 |
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58 static const struct dropbear_cipher dropbear_aes256 = |
908 | 59 {&DROPBEAR_AES_DESC, 32, 16}; |
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60 #endif |
502 | 61 #ifdef DROPBEAR_AES128 |
227 | 62 static const struct dropbear_cipher dropbear_aes128 = |
908 | 63 {&DROPBEAR_AES_DESC, 16, 16}; |
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64 #endif |
502 | 65 #ifdef DROPBEAR_BLOWFISH |
227 | 66 static const struct dropbear_cipher dropbear_blowfish = |
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67 {&blowfish_desc, 16, 8}; |
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68 #endif |
502 | 69 #ifdef DROPBEAR_TWOFISH256 |
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70 static const struct dropbear_cipher dropbear_twofish256 = |
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71 {&twofish_desc, 32, 16}; |
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72 #endif |
502 | 73 #ifdef DROPBEAR_TWOFISH128 |
227 | 74 static const struct dropbear_cipher dropbear_twofish128 = |
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75 {&twofish_desc, 16, 16}; |
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76 #endif |
502 | 77 #ifdef DROPBEAR_3DES |
227 | 78 static const struct dropbear_cipher dropbear_3des = |
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79 {&des3_desc, 24, 8}; |
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80 #endif |
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81 |
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82 /* used to indicate no encryption, as defined in rfc2410 */ |
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83 const struct dropbear_cipher dropbear_nocipher = |
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84 {NULL, 16, 8}; |
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85 |
502 | 86 /* A few void* s are required to silence warnings |
87 * about the symmetric_CBC vs symmetric_CTR cipher_state pointer */ | |
88 const struct dropbear_cipher_mode dropbear_mode_cbc = | |
89 {(void*)cbc_start, (void*)cbc_encrypt, (void*)cbc_decrypt}; | |
90 const struct dropbear_cipher_mode dropbear_mode_none = | |
91 {void_start, void_cipher, void_cipher}; | |
92 #ifdef DROPBEAR_ENABLE_CTR_MODE | |
93 /* a wrapper to make ctr_start and cbc_start look the same */ | |
94 static int dropbear_big_endian_ctr_start(int cipher, | |
95 const unsigned char *IV, | |
96 const unsigned char *key, int keylen, | |
97 int num_rounds, symmetric_CTR *ctr) { | |
98 return ctr_start(cipher, IV, key, keylen, num_rounds, CTR_COUNTER_BIG_ENDIAN, ctr); | |
99 } | |
100 const struct dropbear_cipher_mode dropbear_mode_ctr = | |
101 {(void*)dropbear_big_endian_ctr_start, (void*)ctr_encrypt, (void*)ctr_decrypt}; | |
102 #endif | |
103 | |
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104 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc. |
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105 {&hash_desc, keysize, hashsize} */ |
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106 |
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107 #ifdef DROPBEAR_SHA1_HMAC |
227 | 108 static const struct dropbear_hash dropbear_sha1 = |
908 | 109 {&DROPBEAR_SHA1_DESC, 20, 20}; |
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110 #endif |
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111 #ifdef DROPBEAR_SHA1_96_HMAC |
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112 static const struct dropbear_hash dropbear_sha1_96 = |
908 | 113 {&DROPBEAR_SHA1_DESC, 20, 12}; |
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114 #endif |
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115 #ifdef DROPBEAR_SHA2_256_HMAC |
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116 static const struct dropbear_hash dropbear_sha2_256 = |
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117 {&sha256_desc, 32, 32}; |
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118 #endif |
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119 #ifdef DROPBEAR_SHA2_512_HMAC |
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120 static const struct dropbear_hash dropbear_sha2_512 = |
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121 {&sha512_desc, 64, 64}; |
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122 #endif |
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123 #ifdef DROPBEAR_MD5_HMAC |
227 | 124 static const struct dropbear_hash dropbear_md5 = |
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125 {&md5_desc, 16, 16}; |
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126 #endif |
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127 |
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128 const struct dropbear_hash dropbear_nohash = |
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129 {NULL, 16, 0}; /* used initially */ |
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130 |
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131 |
502 | 132 /* The following map ssh names to internal values. |
133 * The ordering here is important for the client - the first mode | |
134 * that is also supported by the server will get used. */ | |
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135 |
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136 algo_type sshciphers[] = { |
502 | 137 #ifdef DROPBEAR_ENABLE_CTR_MODE |
138 #ifdef DROPBEAR_AES128 | |
139 {"aes128-ctr", 0, &dropbear_aes128, 1, &dropbear_mode_ctr}, | |
140 #endif | |
141 #ifdef DROPBEAR_3DES | |
142 {"3des-ctr", 0, &dropbear_3des, 1, &dropbear_mode_ctr}, | |
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143 #endif |
502 | 144 #ifdef DROPBEAR_AES256 |
145 {"aes256-ctr", 0, &dropbear_aes256, 1, &dropbear_mode_ctr}, | |
146 #endif | |
147 #endif /* DROPBEAR_ENABLE_CTR_MODE */ | |
148 | |
149 /* CBC modes are always enabled */ | |
150 #ifdef DROPBEAR_AES128 | |
151 {"aes128-cbc", 0, &dropbear_aes128, 1, &dropbear_mode_cbc}, | |
152 #endif | |
153 #ifdef DROPBEAR_3DES | |
154 {"3des-cbc", 0, &dropbear_3des, 1, &dropbear_mode_cbc}, | |
155 #endif | |
156 #ifdef DROPBEAR_AES256 | |
157 {"aes256-cbc", 0, &dropbear_aes256, 1, &dropbear_mode_cbc}, | |
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158 #endif |
502 | 159 #ifdef DROPBEAR_TWOFISH256 |
160 {"twofish256-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc}, | |
161 {"twofish-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc}, | |
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162 #endif |
502 | 163 #ifdef DROPBEAR_TWOFISH128 |
164 {"twofish128-cbc", 0, &dropbear_twofish128, 1, &dropbear_mode_cbc}, | |
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165 #endif |
502 | 166 #ifdef DROPBEAR_BLOWFISH |
167 {"blowfish-cbc", 0, &dropbear_blowfish, 1, &dropbear_mode_cbc}, | |
168 #endif | |
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169 #ifdef DROPBEAR_NONE_CIPHER |
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170 {"none", 0, (void*)&dropbear_nocipher, 1, &dropbear_mode_none}, |
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171 #endif |
502 | 172 {NULL, 0, NULL, 0, NULL} |
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173 }; |
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174 |
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175 algo_type sshhashes[] = { |
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176 #ifdef DROPBEAR_SHA2_256_HMAC |
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177 {"hmac-sha2-256", 0, &dropbear_sha2_256, 1, NULL}, |
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178 #endif |
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179 #ifdef DROPBEAR_SHA2_512_HMAC |
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180 {"hmac-sha2-512", 0, &dropbear_sha2_512, 1, NULL}, |
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181 #endif |
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182 #ifdef DROPBEAR_SHA1_96_HMAC |
502 | 183 {"hmac-sha1-96", 0, &dropbear_sha1_96, 1, NULL}, |
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184 #endif |
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185 #ifdef DROPBEAR_SHA1_HMAC |
502 | 186 {"hmac-sha1", 0, &dropbear_sha1, 1, NULL}, |
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187 #endif |
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188 #ifdef DROPBEAR_MD5_HMAC |
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189 {"hmac-md5", 0, (void*)&dropbear_md5, 1, NULL}, |
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190 #endif |
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191 #ifdef DROPBEAR_NONE_INTEGRITY |
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192 {"none", 0, (void*)&dropbear_nohash, 1, NULL}, |
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193 #endif |
502 | 194 {NULL, 0, NULL, 0, NULL} |
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195 }; |
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196 |
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197 #ifndef DISABLE_ZLIB |
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198 algo_type ssh_compress[] = { |
908 | 199 // {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1, NULL}, |
200 // {"[email protected]", DROPBEAR_COMP_ZLIB_DELAY, NULL, 1, NULL}, | |
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201 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL}, |
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202 {NULL, 0, NULL, 0, NULL} |
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203 }; |
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204 #endif |
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205 |
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206 algo_type ssh_nocompress[] = { |
502 | 207 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL}, |
208 {NULL, 0, NULL, 0, NULL} | |
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209 }; |
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210 |
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211 algo_type sshhostkey[] = { |
795 | 212 #ifdef DROPBEAR_ECDSA |
213 #ifdef DROPBEAR_ECC_256 | |
214 {"ecdsa-sha2-nistp256", DROPBEAR_SIGNKEY_ECDSA_NISTP256, NULL, 1, NULL}, | |
215 #endif | |
216 #ifdef DROPBEAR_ECC_384 | |
217 {"ecdsa-sha2-nistp384", DROPBEAR_SIGNKEY_ECDSA_NISTP384, NULL, 1, NULL}, | |
218 #endif | |
219 #ifdef DROPBEAR_ECC_521 | |
220 {"ecdsa-sha2-nistp521", DROPBEAR_SIGNKEY_ECDSA_NISTP521, NULL, 1, NULL}, | |
221 #endif | |
222 #endif | |
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223 #ifdef DROPBEAR_RSA |
502 | 224 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1, NULL}, |
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225 #endif |
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226 #ifdef DROPBEAR_DSS |
502 | 227 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1, NULL}, |
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228 #endif |
502 | 229 {NULL, 0, NULL, 0, NULL} |
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230 }; |
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231 |
848 | 232 static const struct dropbear_kex kex_dh_group1 = {DROPBEAR_KEX_NORMAL_DH, dh_p_1, DH_P_1_LEN, NULL, &sha1_desc }; |
233 static const struct dropbear_kex kex_dh_group14 = {DROPBEAR_KEX_NORMAL_DH, dh_p_14, DH_P_14_LEN, NULL, &sha1_desc }; | |
756 | 234 |
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235 /* These can't be const since dropbear_ecc_fill_dp() fills out |
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236 ecc_curve at runtime */ |
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237 #ifdef DROPBEAR_ECDH |
756 | 238 #ifdef DROPBEAR_ECC_256 |
848 | 239 static struct dropbear_kex kex_ecdh_nistp256 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp256, &sha256_desc }; |
756 | 240 #endif |
241 #ifdef DROPBEAR_ECC_384 | |
848 | 242 static struct dropbear_kex kex_ecdh_nistp384 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp384, &sha384_desc }; |
756 | 243 #endif |
244 #ifdef DROPBEAR_ECC_521 | |
848 | 245 static struct dropbear_kex kex_ecdh_nistp521 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp521, &sha512_desc }; |
756 | 246 #endif |
848 | 247 #endif /* DROPBEAR_ECDH */ |
756 | 248 |
848 | 249 #ifdef DROPBEAR_CURVE25519 |
250 /* Referred to directly */ | |
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251 static const struct dropbear_kex kex_curve25519 = {DROPBEAR_KEX_CURVE25519, NULL, 0, NULL, &sha256_desc }; |
848 | 252 #endif |
756 | 253 |
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254 algo_type sshkex[] = { |
848 | 255 #ifdef DROPBEAR_CURVE25519 |
256 {"[email protected]", 0, &kex_curve25519, 1, NULL}, | |
257 #endif | |
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258 #ifdef DROPBEAR_ECDH |
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259 #ifdef DROPBEAR_ECC_521 |
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260 {"ecdh-sha2-nistp521", 0, &kex_ecdh_nistp521, 1, NULL}, |
756 | 261 #endif |
262 #ifdef DROPBEAR_ECC_384 | |
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263 {"ecdh-sha2-nistp384", 0, &kex_ecdh_nistp384, 1, NULL}, |
756 | 264 #endif |
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265 #ifdef DROPBEAR_ECC_256 |
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266 {"ecdh-sha2-nistp256", 0, &kex_ecdh_nistp256, 1, NULL}, |
756 | 267 #endif |
268 #endif | |
269 {"diffie-hellman-group1-sha1", 0, &kex_dh_group1, 1, NULL}, | |
270 {"diffie-hellman-group14-sha1", 0, &kex_dh_group14, 1, NULL}, | |
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271 #ifdef USE_KEXGUESS2 |
740 | 272 {KEXGUESS2_ALGO_NAME, KEXGUESS2_ALGO_ID, NULL, 1, NULL}, |
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273 #endif |
502 | 274 {NULL, 0, NULL, 0, NULL} |
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275 }; |
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276 |
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277 /* algolen specifies the length of algo, algos is our local list to match |
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278 * against. |
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279 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE |
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280 * otherwise */ |
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281 int have_algo(char* algo, size_t algolen, algo_type algos[]) { |
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282 |
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283 int i; |
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284 |
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285 for (i = 0; algos[i].name != NULL; i++) { |
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286 if (strlen(algos[i].name) == algolen |
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287 && (strncmp(algos[i].name, algo, algolen) == 0)) { |
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288 return DROPBEAR_SUCCESS; |
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289 } |
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290 } |
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291 |
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292 return DROPBEAR_FAILURE; |
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293 } |
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294 |
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295 /* Output a comma separated list of algorithms to a buffer */ |
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296 void buf_put_algolist(buffer * buf, algo_type localalgos[]) { |
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297 |
238
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298 unsigned int i, len; |
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299 unsigned int donefirst = 0; |
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300 buffer *algolist = NULL; |
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301 |
848 | 302 algolist = buf_new(200); |
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303 for (i = 0; localalgos[i].name != NULL; i++) { |
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304 if (localalgos[i].usable) { |
238
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305 if (donefirst) |
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306 buf_putbyte(algolist, ','); |
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307 donefirst = 1; |
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308 len = strlen(localalgos[i].name); |
238
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309 buf_putbytes(algolist, localalgos[i].name, len); |
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310 } |
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311 } |
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312 buf_putstring(buf, algolist->data, algolist->len); |
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313 buf_free(algolist); |
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314 } |
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315 |
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316 /* match the first algorithm in the comma-separated list in buf which is |
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317 * also in localalgos[], or return NULL on failure. |
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318 * (*goodguess) is set to 1 if the preferred client/server algos match, |
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319 * 0 otherwise. This is used for checking if the kexalgo/hostkeyalgos are |
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320 * guessed correctly */ |
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321 algo_type * buf_match_algo(buffer* buf, algo_type localalgos[], |
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322 enum kexguess2_used *kexguess2, int *goodguess) |
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323 { |
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324 |
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325 unsigned char * algolist = NULL; |
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326 const unsigned char *remotenames[MAX_PROPOSED_ALGO], *localnames[MAX_PROPOSED_ALGO]; |
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327 unsigned int len; |
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328 unsigned int remotecount, localcount, clicount, servcount, i, j; |
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329 algo_type * ret = NULL; |
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330 const unsigned char **clinames, **servnames; |
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331 |
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parents:
740
diff
changeset
|
332 if (goodguess) { |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
333 *goodguess = 0; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
334 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
335 |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
336 /* 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
|
337 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
|
338 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
|
339 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
|
340 goto out; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
341 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
342 |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
343 /* 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
|
344 /* 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
|
345 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
|
346 remotecount = 1; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
347 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
|
348 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
|
349 /* 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
|
350 goto out; |
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 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
|
353 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
|
354 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
|
355 remotecount++; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
356 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
357 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
|
358 break; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
359 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
360 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
361 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
|
362 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
|
363 { |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
364 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
|
365 *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
|
366 break; |
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 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
369 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
|
370 *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
|
371 } |
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 |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
374 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
|
375 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
|
376 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
|
377 } else { |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
378 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
|
379 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
380 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
381 localcount = i; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
382 |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
383 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
|
384 clinames = remotenames; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
385 clicount = remotecount; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
386 servnames = localnames; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
387 servcount = localcount; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
388 } else { |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
389 clinames = localnames; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
390 clicount = localcount; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
391 servnames = remotenames; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
392 servcount = remotecount; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
393 } |
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 /* 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
|
396 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
|
397 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
|
398 if (!(servnames[j] && clinames[i])) { |
857 | 399 /* 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
|
400 continue; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
401 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
402 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
|
403 /* 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
|
404 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
|
405 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
|
406 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
|
407 *goodguess = 1; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
408 } |
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 } else { |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
411 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
|
412 *goodguess = 1; |
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 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
415 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
416 /* 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
|
417 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
|
418 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
|
419 } else { |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
420 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
|
421 } |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
422 goto out; |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
423 } |
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 out: |
eafdf8b363f5
Get rid of client/server specific buf_match_algo, use single
Matt Johnston <matt@ucc.asn.au>
parents:
740
diff
changeset
|
428 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
|
429 return ret; |
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 |
686
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
432 #ifdef DROPBEAR_NONE_CIPHER |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
433 |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
434 void |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
435 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
|
436 { |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
437 algo_type *a; |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
438 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
|
439 { |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
440 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
|
441 { |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
442 a->usable = usable; |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
443 return; |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
444 } |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
445 } |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
446 } |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
447 |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
parents:
684
diff
changeset
|
448 int |
983a817f8e41
- Only request "none" cipher after auth has succeeded
Matt Johnston <matt@ucc.asn.au>
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449 get_algo_usable(algo_type algos[], const char * algo_name) |
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450 { |
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451 algo_type *a; |
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452 for (a = algos; a->name != NULL; a++) |
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453 { |
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454 if (strcmp(a->name, algo_name) == 0) |
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455 { |
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456 return a->usable; |
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457 } |
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458 } |
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459 return 0; |
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460 } |
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461 |
857 | 462 #endif /* DROPBEAR_NONE_CIPHER */ |
686
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463 |
682
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464 #ifdef ENABLE_USER_ALGO_LIST |
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465 |
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466 char * |
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467 algolist_string(algo_type algos[]) |
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468 { |
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469 char *ret_list; |
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470 buffer *b = buf_new(200); |
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471 buf_put_algolist(b, algos); |
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472 buf_setpos(b, b->len); |
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473 buf_putbyte(b, '\0'); |
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474 buf_setpos(b, 4); |
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475 ret_list = m_strdup(buf_getptr(b, b->len - b->pos)); |
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476 buf_free(b); |
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477 return ret_list; |
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478 } |
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479 |
683
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480 static algo_type* |
682
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481 check_algo(const char* algo_name, algo_type *algos) |
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482 { |
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483 algo_type *a; |
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484 for (a = algos; a->name != NULL; a++) |
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485 { |
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486 if (strcmp(a->name, algo_name) == 0) |
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487 { |
683
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488 return a; |
682
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489 } |
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490 } |
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491 |
683
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492 return NULL; |
682
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493 } |
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494 |
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495 static void |
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496 try_add_algo(const char *algo_name, algo_type *algos, |
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497 const char *algo_desc, algo_type * new_algos, int *num_ret) |
682
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498 { |
683
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499 algo_type *match_algo = check_algo(algo_name, algos); |
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500 if (!match_algo) |
682
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501 { |
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502 dropbear_log(LOG_WARNING, "This Dropbear program does not support '%s' %s algorithm", algo_name, algo_desc); |
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503 return; |
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504 } |
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505 |
683
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506 new_algos[*num_ret] = *match_algo; |
682
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507 (*num_ret)++; |
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508 } |
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509 |
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510 /* Checks a user provided comma-separated algorithm list for available |
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511 * options. Any that are not acceptable are removed in-place. Returns the |
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512 * number of valid algorithms. */ |
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513 int |
683
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514 check_user_algos(const char* user_algo_list, algo_type * algos, |
682
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515 const char *algo_desc) |
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516 { |
683
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517 algo_type new_algos[MAX_PROPOSED_ALGO]; |
682
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518 /* this has two passes. first we sweep through the given list of |
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519 * algorithms and mark them as usable=2 in the algo_type[] array... */ |
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520 int num_ret = 0; |
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521 char *work_list = m_strdup(user_algo_list); |
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522 char *last_name = work_list; |
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523 char *c; |
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524 for (c = work_list; *c; c++) |
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525 { |
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526 if (*c == ',') |
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527 { |
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528 *c = '\0'; |
683
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529 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret); |
686
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530 c++; |
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531 last_name = c; |
682
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|
532 } |
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533 } |
683
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534 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret); |
682
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535 m_free(work_list); |
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|
536 |
683
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|
537 new_algos[num_ret].name = NULL; |
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|
538 |
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539 /* Copy one more as a blank delimiter */ |
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|
540 memcpy(algos, new_algos, sizeof(*new_algos) * (num_ret+1)); |
682
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541 return num_ret; |
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542 } |
857 | 543 #endif /* ENABLE_USER_ALGO_LIST */ |