Mercurial > dropbear
annotate common-algo.c @ 759:76fba0856749 ecc
More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
ses.hash and ses.session_id are now buffers (doesn't compile)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 29 Mar 2013 00:28:09 +0800 |
parents | bf9dc2d9c2b1 |
children | ac2158e3e403 |
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 "algo.h" |
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27 #include "dbutil.h" |
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28 #include "kex.h" |
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29 |
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30 /* This file (algo.c) organises the ciphers which can be used, and is used to |
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31 * decide which ciphers/hashes/compression/signing to use during key exchange*/ |
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32 |
502 | 33 static int void_cipher(const unsigned char* in, unsigned char* out, |
34 unsigned long len, void *cipher_state) { | |
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35 if (in != out) { |
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36 memmove(out, in, len); |
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37 } |
502 | 38 return CRYPT_OK; |
39 } | |
40 | |
41 static int void_start(int cipher, const unsigned char *IV, | |
42 const unsigned char *key, | |
43 int keylen, int num_rounds, void *cipher_state) { | |
44 return CRYPT_OK; | |
45 } | |
46 | |
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47 /* Mappings for ciphers, parameters are |
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48 {&cipher_desc, keysize, blocksize} */ |
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49 |
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50 /* Remember to add new ciphers/hashes to regciphers/reghashes too */ |
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51 |
502 | 52 #ifdef DROPBEAR_AES256 |
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53 static const struct dropbear_cipher dropbear_aes256 = |
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54 {&aes_desc, 32, 16}; |
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55 #endif |
502 | 56 #ifdef DROPBEAR_AES128 |
227 | 57 static const struct dropbear_cipher dropbear_aes128 = |
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58 {&aes_desc, 16, 16}; |
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59 #endif |
502 | 60 #ifdef DROPBEAR_BLOWFISH |
227 | 61 static const struct dropbear_cipher dropbear_blowfish = |
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62 {&blowfish_desc, 16, 8}; |
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63 #endif |
502 | 64 #ifdef DROPBEAR_TWOFISH256 |
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65 static const struct dropbear_cipher dropbear_twofish256 = |
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66 {&twofish_desc, 32, 16}; |
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67 #endif |
502 | 68 #ifdef DROPBEAR_TWOFISH128 |
227 | 69 static const struct dropbear_cipher dropbear_twofish128 = |
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70 {&twofish_desc, 16, 16}; |
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71 #endif |
502 | 72 #ifdef DROPBEAR_3DES |
227 | 73 static const struct dropbear_cipher dropbear_3des = |
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74 {&des3_desc, 24, 8}; |
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75 #endif |
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76 |
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77 /* used to indicate no encryption, as defined in rfc2410 */ |
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78 const struct dropbear_cipher dropbear_nocipher = |
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79 {NULL, 16, 8}; |
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80 |
502 | 81 /* A few void* s are required to silence warnings |
82 * about the symmetric_CBC vs symmetric_CTR cipher_state pointer */ | |
83 const struct dropbear_cipher_mode dropbear_mode_cbc = | |
84 {(void*)cbc_start, (void*)cbc_encrypt, (void*)cbc_decrypt}; | |
85 const struct dropbear_cipher_mode dropbear_mode_none = | |
86 {void_start, void_cipher, void_cipher}; | |
87 #ifdef DROPBEAR_ENABLE_CTR_MODE | |
88 /* a wrapper to make ctr_start and cbc_start look the same */ | |
89 static int dropbear_big_endian_ctr_start(int cipher, | |
90 const unsigned char *IV, | |
91 const unsigned char *key, int keylen, | |
92 int num_rounds, symmetric_CTR *ctr) { | |
93 return ctr_start(cipher, IV, key, keylen, num_rounds, CTR_COUNTER_BIG_ENDIAN, ctr); | |
94 } | |
95 const struct dropbear_cipher_mode dropbear_mode_ctr = | |
96 {(void*)dropbear_big_endian_ctr_start, (void*)ctr_encrypt, (void*)ctr_decrypt}; | |
97 #endif | |
98 | |
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99 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc. |
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100 {&hash_desc, keysize, hashsize} */ |
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101 |
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102 #ifdef DROPBEAR_SHA1_HMAC |
227 | 103 static const struct dropbear_hash dropbear_sha1 = |
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104 {&sha1_desc, 20, 20}; |
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105 #endif |
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106 #ifdef DROPBEAR_SHA1_96_HMAC |
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107 static const struct dropbear_hash dropbear_sha1_96 = |
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108 {&sha1_desc, 20, 12}; |
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109 #endif |
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110 #ifdef DROPBEAR_SHA2_256_HMAC |
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111 static const struct dropbear_hash dropbear_sha2_256 = |
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112 {&sha256_desc, 32, 32}; |
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113 #endif |
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114 #ifdef DROPBEAR_SHA2_512_HMAC |
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115 static const struct dropbear_hash dropbear_sha2_512 = |
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116 {&sha512_desc, 64, 64}; |
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117 #endif |
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118 #ifdef DROPBEAR_MD5_HMAC |
227 | 119 static const struct dropbear_hash dropbear_md5 = |
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120 {&md5_desc, 16, 16}; |
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121 #endif |
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122 |
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123 const struct dropbear_hash dropbear_nohash = |
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124 {NULL, 16, 0}; /* used initially */ |
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125 |
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126 |
502 | 127 /* The following map ssh names to internal values. |
128 * The ordering here is important for the client - the first mode | |
129 * that is also supported by the server will get used. */ | |
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130 |
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131 algo_type sshciphers[] = { |
502 | 132 #ifdef DROPBEAR_ENABLE_CTR_MODE |
133 #ifdef DROPBEAR_AES128 | |
134 {"aes128-ctr", 0, &dropbear_aes128, 1, &dropbear_mode_ctr}, | |
135 #endif | |
136 #ifdef DROPBEAR_3DES | |
137 {"3des-ctr", 0, &dropbear_3des, 1, &dropbear_mode_ctr}, | |
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138 #endif |
502 | 139 #ifdef DROPBEAR_AES256 |
140 {"aes256-ctr", 0, &dropbear_aes256, 1, &dropbear_mode_ctr}, | |
141 #endif | |
142 #endif /* DROPBEAR_ENABLE_CTR_MODE */ | |
143 | |
144 /* CBC modes are always enabled */ | |
145 #ifdef DROPBEAR_AES128 | |
146 {"aes128-cbc", 0, &dropbear_aes128, 1, &dropbear_mode_cbc}, | |
147 #endif | |
148 #ifdef DROPBEAR_3DES | |
149 {"3des-cbc", 0, &dropbear_3des, 1, &dropbear_mode_cbc}, | |
150 #endif | |
151 #ifdef DROPBEAR_AES256 | |
152 {"aes256-cbc", 0, &dropbear_aes256, 1, &dropbear_mode_cbc}, | |
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153 #endif |
502 | 154 #ifdef DROPBEAR_TWOFISH256 |
155 {"twofish256-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc}, | |
156 {"twofish-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc}, | |
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157 #endif |
502 | 158 #ifdef DROPBEAR_TWOFISH128 |
159 {"twofish128-cbc", 0, &dropbear_twofish128, 1, &dropbear_mode_cbc}, | |
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160 #endif |
502 | 161 #ifdef DROPBEAR_BLOWFISH |
162 {"blowfish-cbc", 0, &dropbear_blowfish, 1, &dropbear_mode_cbc}, | |
163 #endif | |
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164 #ifdef DROPBEAR_NONE_CIPHER |
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165 {"none", 0, (void*)&dropbear_nocipher, 1, &dropbear_mode_none}, |
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166 #endif |
502 | 167 {NULL, 0, NULL, 0, NULL} |
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168 }; |
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169 |
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170 algo_type sshhashes[] = { |
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171 #ifdef DROPBEAR_SHA2_256_HMAC |
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172 {"hmac-sha2-256", 0, &dropbear_sha2_256, 1, NULL}, |
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173 #endif |
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174 #ifdef DROPBEAR_SHA2_512_HMAC |
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175 {"hmac-sha2-512", 0, &dropbear_sha2_512, 1, NULL}, |
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176 #endif |
228
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177 #ifdef DROPBEAR_SHA1_96_HMAC |
502 | 178 {"hmac-sha1-96", 0, &dropbear_sha1_96, 1, NULL}, |
228
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179 #endif |
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180 #ifdef DROPBEAR_SHA1_HMAC |
502 | 181 {"hmac-sha1", 0, &dropbear_sha1, 1, NULL}, |
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182 #endif |
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183 #ifdef DROPBEAR_MD5_HMAC |
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184 {"hmac-md5", 0, (void*)&dropbear_md5, 1, NULL}, |
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185 #endif |
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186 #ifdef DROPBEAR_NONE_INTEGRITY |
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187 {"none", 0, (void*)&dropbear_nohash, 1, NULL}, |
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188 #endif |
502 | 189 {NULL, 0, NULL, 0, NULL} |
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190 }; |
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191 |
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192 #ifndef DISABLE_ZLIB |
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193 algo_type ssh_compress[] = { |
502 | 194 {"zlib", DROPBEAR_COMP_ZLIB, NULL, 1, NULL}, |
195 {"[email protected]", DROPBEAR_COMP_ZLIB_DELAY, NULL, 1, NULL}, | |
575
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196 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL}, |
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197 {NULL, 0, NULL, 0, NULL} |
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198 }; |
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199 #endif |
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200 |
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201 algo_type ssh_nocompress[] = { |
502 | 202 {"none", DROPBEAR_COMP_NONE, NULL, 1, NULL}, |
203 {NULL, 0, NULL, 0, NULL} | |
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204 }; |
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205 |
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206 algo_type sshhostkey[] = { |
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207 #ifdef DROPBEAR_RSA |
502 | 208 {"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1, NULL}, |
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209 #endif |
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210 #ifdef DROPBEAR_DSS |
502 | 211 {"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1, NULL}, |
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212 #endif |
502 | 213 {NULL, 0, NULL, 0, NULL} |
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214 }; |
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215 |
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216 static struct dropbear_kex kex_dh_group1 = {dh_p_1, DH_P_1_LEN, NULL, &sha1_desc }; |
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217 static struct dropbear_kex kex_dh_group14 = {dh_p_14, DH_P_14_LEN, NULL, &sha1_desc }; |
756 | 218 |
219 #ifdef DROPBEAR_ECC_DH | |
220 #ifdef DROPBEAR_ECC_256 | |
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221 static struct dropbear_kex kex_ecdh_secp256r1 = {NULL, 0, &ecc_curve_secp256r1, &sha256_desc }; |
756 | 222 #endif |
223 #ifdef DROPBEAR_ECC_384 | |
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224 static struct dropbear_kex kex_ecdh_secp384r1 = {NULL, 0, &ecc_curve_secp384r1, &sha384_desc }; |
756 | 225 #endif |
226 #ifdef DROPBEAR_ECC_521 | |
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227 static struct dropbear_kex kex_ecdh_secp521r1 = {NULL, 0, &ecc_curve_secp521r1, &sha512_desc }; |
756 | 228 #endif |
229 #endif // DROPBEAR_ECC_DH | |
230 | |
231 | |
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232 algo_type sshkex[] = { |
756 | 233 #ifdef DROPBEAR_ECC_DH |
234 #ifdef DROPBEAR_ECC_256 | |
235 {"ecdh-sha2-secp256r1", 0, &kex_ecdh_descp256r1, 1, NULL}, | |
236 #endif | |
237 #ifdef DROPBEAR_ECC_384 | |
238 {"ecdh-sha2-secp384r1", 0, &kex_ecdh_descp384r1, 1, NULL}, | |
239 #endif | |
240 #ifdef DROPBEAR_ECC_521 | |
241 {"ecdh-sha2-secp521r1", 0, &kex_ecdh_descp521r1, 1, NULL}, | |
242 #endif | |
243 #endif | |
244 {"diffie-hellman-group1-sha1", 0, &kex_dh_group1, 1, NULL}, | |
245 {"diffie-hellman-group14-sha1", 0, &kex_dh_group14, 1, NULL}, | |
502 | 246 {NULL, 0, NULL, 0, NULL} |
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247 }; |
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248 |
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249 |
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250 /* Register the compiled in ciphers. |
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251 * This should be run before using any of the ciphers/hashes */ |
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252 void crypto_init() { |
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253 |
194
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254 const struct ltc_cipher_descriptor *regciphers[] = { |
502 | 255 #ifdef DROPBEAR_AES |
150
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256 &aes_desc, |
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257 #endif |
502 | 258 #ifdef DROPBEAR_BLOWFISH |
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259 &blowfish_desc, |
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260 #endif |
502 | 261 #ifdef DROPBEAR_TWOFISH |
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262 &twofish_desc, |
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263 #endif |
502 | 264 #ifdef DROPBEAR_3DES |
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265 &des3_desc, |
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266 #endif |
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267 NULL |
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268 }; |
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269 |
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270 const struct ltc_hash_descriptor *reghashes[] = { |
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271 /* we need sha1 for hostkey stuff regardless */ |
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272 &sha1_desc, |
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273 #ifdef DROPBEAR_MD5_HMAC |
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274 &md5_desc, |
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275 #endif |
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276 #ifdef DROPBEAR_SHA256 |
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277 &sha256_desc, |
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278 #endif |
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279 #ifdef DROPBEAR_SHA384 |
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280 &sha384_desc, |
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281 #endif |
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282 #ifdef DROPBEAR_SHA512 |
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283 &sha512_desc, |
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284 #endif |
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285 NULL |
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286 }; |
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287 int i; |
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288 |
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289 for (i = 0; regciphers[i] != NULL; i++) { |
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290 if (register_cipher(regciphers[i]) == -1) { |
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291 dropbear_exit("Error registering crypto"); |
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292 } |
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293 } |
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294 |
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295 for (i = 0; reghashes[i] != NULL; i++) { |
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296 if (register_hash(reghashes[i]) == -1) { |
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297 dropbear_exit("Error registering crypto"); |
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298 } |
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299 } |
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300 } |
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301 |
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302 /* algolen specifies the length of algo, algos is our local list to match |
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303 * against. |
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304 * Returns DROPBEAR_SUCCESS if we have a match for algo, DROPBEAR_FAILURE |
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305 * otherwise */ |
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306 int have_algo(char* algo, size_t algolen, algo_type algos[]) { |
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307 |
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308 int i; |
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309 |
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310 for (i = 0; algos[i].name != NULL; i++) { |
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311 if (strlen(algos[i].name) == algolen |
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312 && (strncmp(algos[i].name, algo, algolen) == 0)) { |
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313 return DROPBEAR_SUCCESS; |
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314 } |
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315 } |
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316 |
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317 return DROPBEAR_FAILURE; |
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318 } |
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319 |
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320 /* Output a comma separated list of algorithms to a buffer */ |
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321 void buf_put_algolist(buffer * buf, algo_type localalgos[]) { |
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322 |
238
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323 unsigned int i, len; |
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324 unsigned int donefirst = 0; |
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325 buffer *algolist = NULL; |
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326 |
502 | 327 algolist = buf_new(160); |
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328 for (i = 0; localalgos[i].name != NULL; i++) { |
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329 if (localalgos[i].usable) { |
238
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330 if (donefirst) |
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331 buf_putbyte(algolist, ','); |
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332 donefirst = 1; |
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333 len = strlen(localalgos[i].name); |
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334 buf_putbytes(algolist, localalgos[i].name, len); |
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335 } |
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336 } |
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337 buf_putstring(buf, algolist->data, algolist->len); |
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338 buf_free(algolist); |
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339 } |
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340 |
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341 #ifdef DROPBEAR_NONE_CIPHER |
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342 |
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343 void |
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344 set_algo_usable(algo_type algos[], const char * algo_name, int usable) |
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345 { |
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346 algo_type *a; |
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347 for (a = algos; a->name != NULL; a++) |
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348 { |
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349 if (strcmp(a->name, algo_name) == 0) |
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350 { |
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351 a->usable = usable; |
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352 return; |
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353 } |
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354 } |
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355 } |
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356 |
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357 int |
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358 get_algo_usable(algo_type algos[], const char * algo_name) |
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359 { |
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360 algo_type *a; |
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361 for (a = algos; a->name != NULL; a++) |
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362 { |
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363 if (strcmp(a->name, algo_name) == 0) |
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364 { |
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365 return a->usable; |
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366 } |
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367 } |
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368 return 0; |
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369 } |
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370 |
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371 #endif // DROPBEAR_NONE_CIPHER |
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372 |
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373 #ifdef ENABLE_USER_ALGO_LIST |
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374 |
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375 char * |
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376 algolist_string(algo_type algos[]) |
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377 { |
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378 char *ret_list; |
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379 buffer *b = buf_new(200); |
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380 buf_put_algolist(b, algos); |
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381 buf_setpos(b, b->len); |
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382 buf_putbyte(b, '\0'); |
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383 buf_setpos(b, 4); |
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384 ret_list = m_strdup(buf_getptr(b, b->len - b->pos)); |
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385 buf_free(b); |
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386 return ret_list; |
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387 } |
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388 |
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389 static algo_type* |
682
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390 check_algo(const char* algo_name, algo_type *algos) |
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391 { |
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392 algo_type *a; |
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393 for (a = algos; a->name != NULL; a++) |
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394 { |
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395 if (strcmp(a->name, algo_name) == 0) |
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396 { |
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397 return a; |
682
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398 } |
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399 } |
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400 |
683
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401 return NULL; |
682
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402 } |
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403 |
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404 static void |
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405 try_add_algo(const char *algo_name, algo_type *algos, |
683
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406 const char *algo_desc, algo_type * new_algos, int *num_ret) |
682
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407 { |
683
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408 algo_type *match_algo = check_algo(algo_name, algos); |
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409 if (!match_algo) |
682
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410 { |
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411 dropbear_log(LOG_WARNING, "This Dropbear program does not support '%s' %s algorithm", algo_name, algo_desc); |
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412 return; |
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413 } |
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414 |
683
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415 new_algos[*num_ret] = *match_algo; |
682
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416 (*num_ret)++; |
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417 } |
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418 |
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419 /* Checks a user provided comma-separated algorithm list for available |
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420 * options. Any that are not acceptable are removed in-place. Returns the |
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421 * number of valid algorithms. */ |
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422 int |
683
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423 check_user_algos(const char* user_algo_list, algo_type * algos, |
682
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424 const char *algo_desc) |
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425 { |
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426 algo_type new_algos[MAX_PROPOSED_ALGO]; |
682
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427 /* this has two passes. first we sweep through the given list of |
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428 * algorithms and mark them as usable=2 in the algo_type[] array... */ |
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429 int num_ret = 0; |
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430 char *work_list = m_strdup(user_algo_list); |
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431 char *last_name = work_list; |
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432 char *c; |
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433 for (c = work_list; *c; c++) |
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434 { |
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435 if (*c == ',') |
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436 { |
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437 *c = '\0'; |
683
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438 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret); |
686
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439 c++; |
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440 last_name = c; |
682
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441 } |
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442 } |
683
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443 try_add_algo(last_name, algos, algo_desc, new_algos, &num_ret); |
682
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444 m_free(work_list); |
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445 |
683
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446 new_algos[num_ret].name = NULL; |
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447 |
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448 /* Copy one more as a blank delimiter */ |
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449 memcpy(algos, new_algos, sizeof(*new_algos) * (num_ret+1)); |
682
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450 return num_ret; |
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451 } |
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452 #endif // ENABLE_USER_ALGO_LIST |