1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "net/ssl/ssl_cipher_suite_names.h" 6 7 #include <stdlib.h> 8 9 #include "base/logging.h" 10 #include "base/strings/string_number_conversions.h" 11 #include "base/strings/string_util.h" 12 #include "net/ssl/ssl_connection_status_flags.h" 13 14 // Rather than storing the names of all the ciphersuites we eliminate the 15 // redundancy and break each cipher suite into a key exchange method, cipher 16 // and mac. For all the ciphersuites in the IANA registry, we extract each of 17 // those components from the name, number them and pack the result into a 18 // 16-bit number thus: 19 // (MSB to LSB) 20 // <3 bits> unused 21 // <5 bits> key exchange 22 // <5 bits> cipher 23 // <3 bits> mac 24 25 // The following tables were generated by ssl_cipher_suite_names_generate.go, 26 // found in the same directory as this file. 27 28 struct CipherSuite { 29 uint16 cipher_suite, encoded; 30 }; 31 32 static const struct CipherSuite kCipherSuites[] = { 33 {0x0, 0x0}, // TLS_NULL_WITH_NULL_NULL 34 {0x1, 0x101}, // TLS_RSA_WITH_NULL_MD5 35 {0x2, 0x102}, // TLS_RSA_WITH_NULL_SHA 36 {0x3, 0x209}, // TLS_RSA_EXPORT_WITH_RC4_40_MD5 37 {0x4, 0x111}, // TLS_RSA_WITH_RC4_128_MD5 38 {0x5, 0x112}, // TLS_RSA_WITH_RC4_128_SHA 39 {0x6, 0x219}, // TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5 40 {0x7, 0x122}, // TLS_RSA_WITH_IDEA_CBC_SHA 41 {0x8, 0x22a}, // TLS_RSA_EXPORT_WITH_DES40_CBC_SHA 42 {0x9, 0x132}, // TLS_RSA_WITH_DES_CBC_SHA 43 {0xa, 0x13a}, // TLS_RSA_WITH_3DES_EDE_CBC_SHA 44 {0xb, 0x32a}, // TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA 45 {0xc, 0x432}, // TLS_DH_DSS_WITH_DES_CBC_SHA 46 {0xd, 0x43a}, // TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA 47 {0xe, 0x52a}, // TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA 48 {0xf, 0x632}, // TLS_DH_RSA_WITH_DES_CBC_SHA 49 {0x10, 0x63a}, // TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA 50 {0x11, 0x72a}, // TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA 51 {0x12, 0x832}, // TLS_DHE_DSS_WITH_DES_CBC_SHA 52 {0x13, 0x83a}, // TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA 53 {0x14, 0x92a}, // TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA 54 {0x15, 0xa32}, // TLS_DHE_RSA_WITH_DES_CBC_SHA 55 {0x16, 0xa3a}, // TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA 56 {0x17, 0xb09}, // TLS_DH_anon_EXPORT_WITH_RC4_40_MD5 57 {0x18, 0xc11}, // TLS_DH_anon_WITH_RC4_128_MD5 58 {0x19, 0xb2a}, // TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA 59 {0x1a, 0xc32}, // TLS_DH_anon_WITH_DES_CBC_SHA 60 {0x1b, 0xc3a}, // TLS_DH_anon_WITH_3DES_EDE_CBC_SHA 61 {0x2f, 0x142}, // TLS_RSA_WITH_AES_128_CBC_SHA 62 {0x30, 0x442}, // TLS_DH_DSS_WITH_AES_128_CBC_SHA 63 {0x31, 0x642}, // TLS_DH_RSA_WITH_AES_128_CBC_SHA 64 {0x32, 0x842}, // TLS_DHE_DSS_WITH_AES_128_CBC_SHA 65 {0x33, 0xa42}, // TLS_DHE_RSA_WITH_AES_128_CBC_SHA 66 {0x34, 0xc42}, // TLS_DH_anon_WITH_AES_128_CBC_SHA 67 {0x35, 0x14a}, // TLS_RSA_WITH_AES_256_CBC_SHA 68 {0x36, 0x44a}, // TLS_DH_DSS_WITH_AES_256_CBC_SHA 69 {0x37, 0x64a}, // TLS_DH_RSA_WITH_AES_256_CBC_SHA 70 {0x38, 0x84a}, // TLS_DHE_DSS_WITH_AES_256_CBC_SHA 71 {0x39, 0xa4a}, // TLS_DHE_RSA_WITH_AES_256_CBC_SHA 72 {0x3a, 0xc4a}, // TLS_DH_anon_WITH_AES_256_CBC_SHA 73 {0x3b, 0x103}, // TLS_RSA_WITH_NULL_SHA256 74 {0x3c, 0x143}, // TLS_RSA_WITH_AES_128_CBC_SHA256 75 {0x3d, 0x14b}, // TLS_RSA_WITH_AES_256_CBC_SHA256 76 {0x3e, 0x443}, // TLS_DH_DSS_WITH_AES_128_CBC_SHA256 77 {0x3f, 0x643}, // TLS_DH_RSA_WITH_AES_128_CBC_SHA256 78 {0x40, 0x843}, // TLS_DHE_DSS_WITH_AES_128_CBC_SHA256 79 {0x41, 0x152}, // TLS_RSA_WITH_CAMELLIA_128_CBC_SHA 80 {0x42, 0x452}, // TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA 81 {0x43, 0x652}, // TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA 82 {0x44, 0x852}, // TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA 83 {0x45, 0xa52}, // TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA 84 {0x46, 0xc52}, // TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA 85 {0x67, 0xa43}, // TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 86 {0x68, 0x44b}, // TLS_DH_DSS_WITH_AES_256_CBC_SHA256 87 {0x69, 0x64b}, // TLS_DH_RSA_WITH_AES_256_CBC_SHA256 88 {0x6a, 0x84b}, // TLS_DHE_DSS_WITH_AES_256_CBC_SHA256 89 {0x6b, 0xa4b}, // TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 90 {0x6c, 0xc43}, // TLS_DH_anon_WITH_AES_128_CBC_SHA256 91 {0x6d, 0xc4b}, // TLS_DH_anon_WITH_AES_256_CBC_SHA256 92 {0x84, 0x15a}, // TLS_RSA_WITH_CAMELLIA_256_CBC_SHA 93 {0x85, 0x45a}, // TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA 94 {0x86, 0x65a}, // TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA 95 {0x87, 0x85a}, // TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA 96 {0x88, 0xa5a}, // TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA 97 {0x89, 0xc5a}, // TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA 98 {0x96, 0x162}, // TLS_RSA_WITH_SEED_CBC_SHA 99 {0x97, 0x462}, // TLS_DH_DSS_WITH_SEED_CBC_SHA 100 {0x98, 0x662}, // TLS_DH_RSA_WITH_SEED_CBC_SHA 101 {0x99, 0x862}, // TLS_DHE_DSS_WITH_SEED_CBC_SHA 102 {0x9a, 0xa62}, // TLS_DHE_RSA_WITH_SEED_CBC_SHA 103 {0x9b, 0xc62}, // TLS_DH_anon_WITH_SEED_CBC_SHA 104 {0x9c, 0x16f}, // TLS_RSA_WITH_AES_128_GCM_SHA256 105 {0x9d, 0x177}, // TLS_RSA_WITH_AES_256_GCM_SHA384 106 {0x9e, 0xa6f}, // TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 107 {0x9f, 0xa77}, // TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 108 {0xa0, 0x66f}, // TLS_DH_RSA_WITH_AES_128_GCM_SHA256 109 {0xa1, 0x677}, // TLS_DH_RSA_WITH_AES_256_GCM_SHA384 110 {0xa2, 0x86f}, // TLS_DHE_DSS_WITH_AES_128_GCM_SHA256 111 {0xa3, 0x877}, // TLS_DHE_DSS_WITH_AES_256_GCM_SHA384 112 {0xa4, 0x46f}, // TLS_DH_DSS_WITH_AES_128_GCM_SHA256 113 {0xa5, 0x477}, // TLS_DH_DSS_WITH_AES_256_GCM_SHA384 114 {0xa6, 0xc6f}, // TLS_DH_anon_WITH_AES_128_GCM_SHA256 115 {0xa7, 0xc77}, // TLS_DH_anon_WITH_AES_256_GCM_SHA384 116 {0xba, 0x153}, // TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256 117 {0xbb, 0x453}, // TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA256 118 {0xbc, 0x653}, // TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA256 119 {0xbd, 0x853}, // TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256 120 {0xbe, 0xa53}, // TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256 121 {0xbf, 0xc53}, // TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256 122 {0xc0, 0x15b}, // TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256 123 {0xc1, 0x45b}, // TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA256 124 {0xc2, 0x65b}, // TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA256 125 {0xc3, 0x85b}, // TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256 126 {0xc4, 0xa5b}, // TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256 127 {0xc5, 0xc5b}, // TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256 128 {0xc001, 0xd02}, // TLS_ECDH_ECDSA_WITH_NULL_SHA 129 {0xc002, 0xd12}, // TLS_ECDH_ECDSA_WITH_RC4_128_SHA 130 {0xc003, 0xd3a}, // TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA 131 {0xc004, 0xd42}, // TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA 132 {0xc005, 0xd4a}, // TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA 133 {0xc006, 0xe02}, // TLS_ECDHE_ECDSA_WITH_NULL_SHA 134 {0xc007, 0xe12}, // TLS_ECDHE_ECDSA_WITH_RC4_128_SHA 135 {0xc008, 0xe3a}, // TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA 136 {0xc009, 0xe42}, // TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA 137 {0xc00a, 0xe4a}, // TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA 138 {0xc00b, 0xf02}, // TLS_ECDH_RSA_WITH_NULL_SHA 139 {0xc00c, 0xf12}, // TLS_ECDH_RSA_WITH_RC4_128_SHA 140 {0xc00d, 0xf3a}, // TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA 141 {0xc00e, 0xf42}, // TLS_ECDH_RSA_WITH_AES_128_CBC_SHA 142 {0xc00f, 0xf4a}, // TLS_ECDH_RSA_WITH_AES_256_CBC_SHA 143 {0xc010, 0x1002}, // TLS_ECDHE_RSA_WITH_NULL_SHA 144 {0xc011, 0x1012}, // TLS_ECDHE_RSA_WITH_RC4_128_SHA 145 {0xc012, 0x103a}, // TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA 146 {0xc013, 0x1042}, // TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA 147 {0xc014, 0x104a}, // TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 148 {0xc015, 0x1102}, // TLS_ECDH_anon_WITH_NULL_SHA 149 {0xc016, 0x1112}, // TLS_ECDH_anon_WITH_RC4_128_SHA 150 {0xc017, 0x113a}, // TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA 151 {0xc018, 0x1142}, // TLS_ECDH_anon_WITH_AES_128_CBC_SHA 152 {0xc019, 0x114a}, // TLS_ECDH_anon_WITH_AES_256_CBC_SHA 153 {0xc023, 0xe43}, // TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 154 {0xc024, 0xe4c}, // TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 155 {0xc025, 0xd43}, // TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256 156 {0xc026, 0xd4c}, // TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384 157 {0xc027, 0x1043}, // TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 158 {0xc028, 0x104c}, // TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 159 {0xc029, 0xf43}, // TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256 160 {0xc02a, 0xf4c}, // TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384 161 {0xc02b, 0xe6f}, // TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 162 {0xc02c, 0xe77}, // TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 163 {0xc02d, 0xd6f}, // TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256 164 {0xc02e, 0xd77}, // TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384 165 {0xc02f, 0x106f}, // TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 166 {0xc030, 0x1077}, // TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 167 {0xc031, 0xf6f}, // TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256 168 {0xc032, 0xf77}, // TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384 169 {0xc072, 0xe53}, // TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_CBC_SHA256 170 {0xc073, 0xe5c}, // TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_CBC_SHA384 171 {0xc074, 0xd53}, // TLS_ECDH_ECDSA_WITH_CAMELLIA_128_CBC_SHA256 172 {0xc075, 0xd5c}, // TLS_ECDH_ECDSA_WITH_CAMELLIA_256_CBC_SHA384 173 {0xc076, 0x1053}, // TLS_ECDHE_RSA_WITH_CAMELLIA_128_CBC_SHA256 174 {0xc077, 0x105c}, // TLS_ECDHE_RSA_WITH_CAMELLIA_256_CBC_SHA384 175 {0xc078, 0xf53}, // TLS_ECDH_RSA_WITH_CAMELLIA_128_CBC_SHA256 176 {0xc079, 0xf5c}, // TLS_ECDH_RSA_WITH_CAMELLIA_256_CBC_SHA384 177 {0xc07a, 0x17f}, // TLS_RSA_WITH_CAMELLIA_128_GCM_SHA256 178 {0xc07b, 0x187}, // TLS_RSA_WITH_CAMELLIA_256_GCM_SHA384 179 {0xc07c, 0xa7f}, // TLS_DHE_RSA_WITH_CAMELLIA_128_GCM_SHA256 180 {0xc07d, 0xa87}, // TLS_DHE_RSA_WITH_CAMELLIA_256_GCM_SHA384 181 {0xc07e, 0x67f}, // TLS_DH_RSA_WITH_CAMELLIA_128_GCM_SHA256 182 {0xc07f, 0x687}, // TLS_DH_RSA_WITH_CAMELLIA_256_GCM_SHA384 183 {0xc080, 0x87f}, // TLS_DHE_DSS_WITH_CAMELLIA_128_GCM_SHA256 184 {0xc081, 0x887}, // TLS_DHE_DSS_WITH_CAMELLIA_256_GCM_SHA384 185 {0xc082, 0x47f}, // TLS_DH_DSS_WITH_CAMELLIA_128_GCM_SHA256 186 {0xc083, 0x487}, // TLS_DH_DSS_WITH_CAMELLIA_256_GCM_SHA384 187 {0xc084, 0xc7f}, // TLS_DH_anon_WITH_CAMELLIA_128_GCM_SHA256 188 {0xc085, 0xc87}, // TLS_DH_anon_WITH_CAMELLIA_256_GCM_SHA384 189 {0xc086, 0xe7f}, // TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_GCM_SHA256 190 {0xc087, 0xe87}, // TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_GCM_SHA384 191 {0xc088, 0xd7f}, // TLS_ECDH_ECDSA_WITH_CAMELLIA_128_GCM_SHA256 192 {0xc089, 0xd87}, // TLS_ECDH_ECDSA_WITH_CAMELLIA_256_GCM_SHA384 193 {0xc08a, 0x107f}, // TLS_ECDHE_RSA_WITH_CAMELLIA_128_GCM_SHA256 194 {0xc08b, 0x1087}, // TLS_ECDHE_RSA_WITH_CAMELLIA_256_GCM_SHA384 195 {0xc08c, 0xf7f}, // TLS_ECDH_RSA_WITH_CAMELLIA_128_GCM_SHA256 196 {0xc08d, 0xf87}, // TLS_ECDH_RSA_WITH_CAMELLIA_256_GCM_SHA384 197 {0xcc13, 0x108f}, // TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305 198 {0xcc14, 0x0e8f}, // TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305 199 }; 200 201 static const struct { 202 char name[15]; 203 } kKeyExchangeNames[18] = { 204 {"NULL"}, // 0 205 {"RSA"}, // 1 206 {"RSA_EXPORT"}, // 2 207 {"DH_DSS_EXPORT"}, // 3 208 {"DH_DSS"}, // 4 209 {"DH_RSA_EXPORT"}, // 5 210 {"DH_RSA"}, // 6 211 {"DHE_DSS_EXPORT"}, // 7 212 {"DHE_DSS"}, // 8 213 {"DHE_RSA_EXPORT"}, // 9 214 {"DHE_RSA"}, // 10 215 {"DH_anon_EXPORT"}, // 11 216 {"DH_anon"}, // 12 217 {"ECDH_ECDSA"}, // 13 218 {"ECDHE_ECDSA"}, // 14 219 {"ECDH_RSA"}, // 15 220 {"ECDHE_RSA"}, // 16 221 {"ECDH_anon"}, // 17 222 }; 223 224 static const struct { 225 char name[18]; 226 } kCipherNames[18] = { 227 {"NULL"}, // 0 228 {"RC4_40"}, // 1 229 {"RC4_128"}, // 2 230 {"RC2_CBC_40"}, // 3 231 {"IDEA_CBC"}, // 4 232 {"DES40_CBC"}, // 5 233 {"DES_CBC"}, // 6 234 {"3DES_EDE_CBC"}, // 7 235 {"AES_128_CBC"}, // 8 236 {"AES_256_CBC"}, // 9 237 {"CAMELLIA_128_CBC"}, // 10 238 {"CAMELLIA_256_CBC"}, // 11 239 {"SEED_CBC"}, // 12 240 {"AES_128_GCM"}, // 13 241 {"AES_256_GCM"}, // 14 242 {"CAMELLIA_128_GCM"}, // 15 243 {"CAMELLIA_256_GCM"}, // 16 244 {"CHACHA20_POLY1305"}, // 17 245 }; 246 247 static const struct { 248 char name[7]; 249 } kMacNames[5] = { 250 {"NULL"}, // 0 251 {"MD5"}, // 1 252 {"SHA1"}, // 2 253 {"SHA256"}, // 3 254 {"SHA384"}, // 4 255 // 7 is reserved to indicate an AEAD cipher suite. 256 }; 257 258 static const int kAEADMACValue = 7; 259 260 namespace net { 261 262 static int CipherSuiteCmp(const void* ia, const void* ib) { 263 const CipherSuite* a = static_cast<const CipherSuite*>(ia); 264 const CipherSuite* b = static_cast<const CipherSuite*>(ib); 265 266 if (a->cipher_suite < b->cipher_suite) { 267 return -1; 268 } else if (a->cipher_suite == b->cipher_suite) { 269 return 0; 270 } else { 271 return 1; 272 } 273 } 274 275 void SSLCipherSuiteToStrings(const char** key_exchange_str, 276 const char** cipher_str, 277 const char** mac_str, 278 bool *is_aead, 279 uint16 cipher_suite) { 280 *key_exchange_str = *cipher_str = *mac_str = "???"; 281 *is_aead = false; 282 283 struct CipherSuite desired = {0}; 284 desired.cipher_suite = cipher_suite; 285 286 void* r = bsearch(&desired, kCipherSuites, 287 arraysize(kCipherSuites), sizeof(kCipherSuites[0]), 288 CipherSuiteCmp); 289 290 if (!r) 291 return; 292 293 const CipherSuite* cs = static_cast<CipherSuite*>(r); 294 295 const int key_exchange = cs->encoded >> 8; 296 const int cipher = (cs->encoded >> 3) & 0x1f; 297 const int mac = cs->encoded & 0x7; 298 299 *key_exchange_str = kKeyExchangeNames[key_exchange].name; 300 *cipher_str = kCipherNames[cipher].name; 301 if (mac == kAEADMACValue) { 302 *is_aead = true; 303 *mac_str = NULL; 304 } else { 305 *mac_str = kMacNames[mac].name; 306 } 307 } 308 309 void SSLVersionToString(const char** name, int ssl_version) { 310 switch (ssl_version) { 311 case SSL_CONNECTION_VERSION_SSL2: 312 *name = "SSL 2.0"; 313 break; 314 case SSL_CONNECTION_VERSION_SSL3: 315 *name = "SSL 3.0"; 316 break; 317 case SSL_CONNECTION_VERSION_TLS1: 318 *name = "TLS 1.0"; 319 break; 320 case SSL_CONNECTION_VERSION_TLS1_1: 321 *name = "TLS 1.1"; 322 break; 323 case SSL_CONNECTION_VERSION_TLS1_2: 324 *name = "TLS 1.2"; 325 break; 326 case SSL_CONNECTION_VERSION_QUIC: 327 *name = "QUIC"; 328 break; 329 default: 330 NOTREACHED() << ssl_version; 331 *name = "???"; 332 break; 333 } 334 } 335 336 bool ParseSSLCipherString(const std::string& cipher_string, 337 uint16* cipher_suite) { 338 int value = 0; 339 if (cipher_string.size() == 6 && 340 StartsWithASCII(cipher_string, "0x", false /* case insensitive */) && 341 base::HexStringToInt(cipher_string, &value)) { 342 *cipher_suite = static_cast<uint16>(value); 343 return true; 344 } 345 return false; 346 } 347 348 bool IsSecureTLSCipherSuite(uint16 cipher_suite) { 349 CipherSuite desired = {0}; 350 desired.cipher_suite = cipher_suite; 351 352 void* r = bsearch(&desired, 353 kCipherSuites, 354 arraysize(kCipherSuites), 355 sizeof(kCipherSuites[0]), 356 CipherSuiteCmp); 357 358 if (!r) 359 return false; 360 361 const CipherSuite* cs = static_cast<const CipherSuite*>(r); 362 363 const int key_exchange = cs->encoded >> 8; 364 const int cipher = (cs->encoded >> 3) & 0x1f; 365 const int mac = cs->encoded & 0x7; 366 367 // Only allow forward secure key exchanges. 368 switch (key_exchange) { 369 case 10: // DHE_RSA 370 case 14: // ECDHE_ECDSA 371 case 16: // ECDHE_RSA 372 break; 373 default: 374 return false; 375 } 376 377 switch (cipher) { 378 case 13: // AES_128_GCM 379 case 14: // AES_256_GCM 380 case 17: // CHACHA20_POLY1305 381 break; 382 default: 383 return false; 384 } 385 386 // Only AEADs allowed. 387 if (mac != kAEADMACValue) 388 return false; 389 390 return true; 391 } 392 393 } // namespace net 394
