Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | * TLSv1 server - read handshake message |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 3 | * Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi> |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * Alternatively, this software may be distributed under the terms of BSD |
| 10 | * license. |
| 11 | * |
| 12 | * See README and COPYING for more details. |
| 13 | */ |
| 14 | |
| 15 | #include "includes.h" |
| 16 | |
| 17 | #include "common.h" |
| 18 | #include "crypto/md5.h" |
| 19 | #include "crypto/sha1.h" |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 20 | #include "crypto/sha256.h" |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 21 | #include "crypto/tls.h" |
| 22 | #include "x509v3.h" |
| 23 | #include "tlsv1_common.h" |
| 24 | #include "tlsv1_record.h" |
| 25 | #include "tlsv1_server.h" |
| 26 | #include "tlsv1_server_i.h" |
| 27 | |
| 28 | |
| 29 | static int tls_process_client_key_exchange(struct tlsv1_server *conn, u8 ct, |
| 30 | const u8 *in_data, size_t *in_len); |
| 31 | static int tls_process_change_cipher_spec(struct tlsv1_server *conn, |
| 32 | u8 ct, const u8 *in_data, |
| 33 | size_t *in_len); |
| 34 | |
| 35 | |
| 36 | static int tls_process_client_hello(struct tlsv1_server *conn, u8 ct, |
| 37 | const u8 *in_data, size_t *in_len) |
| 38 | { |
| 39 | const u8 *pos, *end, *c; |
| 40 | size_t left, len, i, j; |
| 41 | u16 cipher_suite; |
| 42 | u16 num_suites; |
| 43 | int compr_null_found; |
| 44 | u16 ext_type, ext_len; |
| 45 | |
| 46 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 47 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 48 | "received content type 0x%x", ct); |
| 49 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 50 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 51 | return -1; |
| 52 | } |
| 53 | |
| 54 | pos = in_data; |
| 55 | left = *in_len; |
| 56 | |
| 57 | if (left < 4) |
| 58 | goto decode_error; |
| 59 | |
| 60 | /* HandshakeType msg_type */ |
| 61 | if (*pos != TLS_HANDSHAKE_TYPE_CLIENT_HELLO) { |
| 62 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 63 | "message %d (expected ClientHello)", *pos); |
| 64 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 65 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 66 | return -1; |
| 67 | } |
| 68 | wpa_printf(MSG_DEBUG, "TLSv1: Received ClientHello"); |
| 69 | pos++; |
| 70 | /* uint24 length */ |
| 71 | len = WPA_GET_BE24(pos); |
| 72 | pos += 3; |
| 73 | left -= 4; |
| 74 | |
| 75 | if (len > left) |
| 76 | goto decode_error; |
| 77 | |
| 78 | /* body - ClientHello */ |
| 79 | |
| 80 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: ClientHello", pos, len); |
| 81 | end = pos + len; |
| 82 | |
| 83 | /* ProtocolVersion client_version */ |
| 84 | if (end - pos < 2) |
| 85 | goto decode_error; |
| 86 | conn->client_version = WPA_GET_BE16(pos); |
| 87 | wpa_printf(MSG_DEBUG, "TLSv1: Client version %d.%d", |
| 88 | conn->client_version >> 8, conn->client_version & 0xff); |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 89 | if (conn->client_version < TLS_VERSION_1) { |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 90 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected protocol version in " |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 91 | "ClientHello %u.%u", |
| 92 | conn->client_version >> 8, |
| 93 | conn->client_version & 0xff); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 94 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 95 | TLS_ALERT_PROTOCOL_VERSION); |
| 96 | return -1; |
| 97 | } |
| 98 | pos += 2; |
| 99 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 100 | if (TLS_VERSION == TLS_VERSION_1) |
| 101 | conn->rl.tls_version = TLS_VERSION_1; |
| 102 | #ifdef CONFIG_TLSV12 |
| 103 | else if (conn->client_version >= TLS_VERSION_1_2) |
| 104 | conn->rl.tls_version = TLS_VERSION_1_2; |
| 105 | #endif /* CONFIG_TLSV12 */ |
| 106 | else if (conn->client_version > TLS_VERSION_1_1) |
| 107 | conn->rl.tls_version = TLS_VERSION_1_1; |
| 108 | else |
| 109 | conn->rl.tls_version = conn->client_version; |
| 110 | wpa_printf(MSG_DEBUG, "TLSv1: Using TLS v%s", |
| 111 | tls_version_str(conn->rl.tls_version)); |
| 112 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 113 | /* Random random */ |
| 114 | if (end - pos < TLS_RANDOM_LEN) |
| 115 | goto decode_error; |
| 116 | |
| 117 | os_memcpy(conn->client_random, pos, TLS_RANDOM_LEN); |
| 118 | pos += TLS_RANDOM_LEN; |
| 119 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: client_random", |
| 120 | conn->client_random, TLS_RANDOM_LEN); |
| 121 | |
| 122 | /* SessionID session_id */ |
| 123 | if (end - pos < 1) |
| 124 | goto decode_error; |
| 125 | if (end - pos < 1 + *pos || *pos > TLS_SESSION_ID_MAX_LEN) |
| 126 | goto decode_error; |
| 127 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: client session_id", pos + 1, *pos); |
| 128 | pos += 1 + *pos; |
| 129 | /* TODO: add support for session resumption */ |
| 130 | |
| 131 | /* CipherSuite cipher_suites<2..2^16-1> */ |
| 132 | if (end - pos < 2) |
| 133 | goto decode_error; |
| 134 | num_suites = WPA_GET_BE16(pos); |
| 135 | pos += 2; |
| 136 | if (end - pos < num_suites) |
| 137 | goto decode_error; |
| 138 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: client cipher suites", |
| 139 | pos, num_suites); |
| 140 | if (num_suites & 1) |
| 141 | goto decode_error; |
| 142 | num_suites /= 2; |
| 143 | |
| 144 | cipher_suite = 0; |
| 145 | for (i = 0; !cipher_suite && i < conn->num_cipher_suites; i++) { |
| 146 | c = pos; |
| 147 | for (j = 0; j < num_suites; j++) { |
| 148 | u16 tmp = WPA_GET_BE16(c); |
| 149 | c += 2; |
| 150 | if (!cipher_suite && tmp == conn->cipher_suites[i]) { |
| 151 | cipher_suite = tmp; |
| 152 | break; |
| 153 | } |
| 154 | } |
| 155 | } |
| 156 | pos += num_suites * 2; |
| 157 | if (!cipher_suite) { |
| 158 | wpa_printf(MSG_INFO, "TLSv1: No supported cipher suite " |
| 159 | "available"); |
| 160 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 161 | TLS_ALERT_ILLEGAL_PARAMETER); |
| 162 | return -1; |
| 163 | } |
| 164 | |
| 165 | if (tlsv1_record_set_cipher_suite(&conn->rl, cipher_suite) < 0) { |
| 166 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to set CipherSuite for " |
| 167 | "record layer"); |
| 168 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 169 | TLS_ALERT_INTERNAL_ERROR); |
| 170 | return -1; |
| 171 | } |
| 172 | |
| 173 | conn->cipher_suite = cipher_suite; |
| 174 | |
| 175 | /* CompressionMethod compression_methods<1..2^8-1> */ |
| 176 | if (end - pos < 1) |
| 177 | goto decode_error; |
| 178 | num_suites = *pos++; |
| 179 | if (end - pos < num_suites) |
| 180 | goto decode_error; |
| 181 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: client compression_methods", |
| 182 | pos, num_suites); |
| 183 | compr_null_found = 0; |
| 184 | for (i = 0; i < num_suites; i++) { |
| 185 | if (*pos++ == TLS_COMPRESSION_NULL) |
| 186 | compr_null_found = 1; |
| 187 | } |
| 188 | if (!compr_null_found) { |
| 189 | wpa_printf(MSG_INFO, "TLSv1: Client does not accept NULL " |
| 190 | "compression"); |
| 191 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 192 | TLS_ALERT_ILLEGAL_PARAMETER); |
| 193 | return -1; |
| 194 | } |
| 195 | |
| 196 | if (end - pos == 1) { |
| 197 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected extra octet in the " |
| 198 | "end of ClientHello: 0x%02x", *pos); |
| 199 | goto decode_error; |
| 200 | } |
| 201 | |
| 202 | if (end - pos >= 2) { |
| 203 | /* Extension client_hello_extension_list<0..2^16-1> */ |
| 204 | ext_len = WPA_GET_BE16(pos); |
| 205 | pos += 2; |
| 206 | |
| 207 | wpa_printf(MSG_DEBUG, "TLSv1: %u bytes of ClientHello " |
| 208 | "extensions", ext_len); |
| 209 | if (end - pos != ext_len) { |
| 210 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid ClientHello " |
| 211 | "extension list length %u (expected %u)", |
| 212 | ext_len, (unsigned int) (end - pos)); |
| 213 | goto decode_error; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * struct { |
| 218 | * ExtensionType extension_type (0..65535) |
| 219 | * opaque extension_data<0..2^16-1> |
| 220 | * } Extension; |
| 221 | */ |
| 222 | |
| 223 | while (pos < end) { |
| 224 | if (end - pos < 2) { |
| 225 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid " |
| 226 | "extension_type field"); |
| 227 | goto decode_error; |
| 228 | } |
| 229 | |
| 230 | ext_type = WPA_GET_BE16(pos); |
| 231 | pos += 2; |
| 232 | |
| 233 | if (end - pos < 2) { |
| 234 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid " |
| 235 | "extension_data length field"); |
| 236 | goto decode_error; |
| 237 | } |
| 238 | |
| 239 | ext_len = WPA_GET_BE16(pos); |
| 240 | pos += 2; |
| 241 | |
| 242 | if (end - pos < ext_len) { |
| 243 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid " |
| 244 | "extension_data field"); |
| 245 | goto decode_error; |
| 246 | } |
| 247 | |
| 248 | wpa_printf(MSG_DEBUG, "TLSv1: ClientHello Extension " |
| 249 | "type %u", ext_type); |
| 250 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: ClientHello " |
| 251 | "Extension data", pos, ext_len); |
| 252 | |
| 253 | if (ext_type == TLS_EXT_SESSION_TICKET) { |
| 254 | os_free(conn->session_ticket); |
| 255 | conn->session_ticket = os_malloc(ext_len); |
| 256 | if (conn->session_ticket) { |
| 257 | os_memcpy(conn->session_ticket, pos, |
| 258 | ext_len); |
| 259 | conn->session_ticket_len = ext_len; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | pos += ext_len; |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | *in_len = end - in_data; |
| 268 | |
| 269 | wpa_printf(MSG_DEBUG, "TLSv1: ClientHello OK - proceed to " |
| 270 | "ServerHello"); |
| 271 | conn->state = SERVER_HELLO; |
| 272 | |
| 273 | return 0; |
| 274 | |
| 275 | decode_error: |
| 276 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to decode ClientHello"); |
| 277 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 278 | TLS_ALERT_DECODE_ERROR); |
| 279 | return -1; |
| 280 | } |
| 281 | |
| 282 | |
| 283 | static int tls_process_certificate(struct tlsv1_server *conn, u8 ct, |
| 284 | const u8 *in_data, size_t *in_len) |
| 285 | { |
| 286 | const u8 *pos, *end; |
| 287 | size_t left, len, list_len, cert_len, idx; |
| 288 | u8 type; |
| 289 | struct x509_certificate *chain = NULL, *last = NULL, *cert; |
| 290 | int reason; |
| 291 | |
| 292 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 293 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 294 | "received content type 0x%x", ct); |
| 295 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 296 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 297 | return -1; |
| 298 | } |
| 299 | |
| 300 | pos = in_data; |
| 301 | left = *in_len; |
| 302 | |
| 303 | if (left < 4) { |
| 304 | wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate message " |
| 305 | "(len=%lu)", (unsigned long) left); |
| 306 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 307 | TLS_ALERT_DECODE_ERROR); |
| 308 | return -1; |
| 309 | } |
| 310 | |
| 311 | type = *pos++; |
| 312 | len = WPA_GET_BE24(pos); |
| 313 | pos += 3; |
| 314 | left -= 4; |
| 315 | |
| 316 | if (len > left) { |
| 317 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected Certificate message " |
| 318 | "length (len=%lu != left=%lu)", |
| 319 | (unsigned long) len, (unsigned long) left); |
| 320 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 321 | TLS_ALERT_DECODE_ERROR); |
| 322 | return -1; |
| 323 | } |
| 324 | |
| 325 | if (type == TLS_HANDSHAKE_TYPE_CLIENT_KEY_EXCHANGE) { |
| 326 | if (conn->verify_peer) { |
| 327 | wpa_printf(MSG_DEBUG, "TLSv1: Client did not include " |
| 328 | "Certificate"); |
| 329 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 330 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 331 | return -1; |
| 332 | } |
| 333 | |
| 334 | return tls_process_client_key_exchange(conn, ct, in_data, |
| 335 | in_len); |
| 336 | } |
| 337 | if (type != TLS_HANDSHAKE_TYPE_CERTIFICATE) { |
| 338 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 339 | "message %d (expected Certificate/" |
| 340 | "ClientKeyExchange)", type); |
| 341 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 342 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 343 | return -1; |
| 344 | } |
| 345 | |
| 346 | wpa_printf(MSG_DEBUG, |
| 347 | "TLSv1: Received Certificate (certificate_list len %lu)", |
| 348 | (unsigned long) len); |
| 349 | |
| 350 | /* |
| 351 | * opaque ASN.1Cert<2^24-1>; |
| 352 | * |
| 353 | * struct { |
| 354 | * ASN.1Cert certificate_list<1..2^24-1>; |
| 355 | * } Certificate; |
| 356 | */ |
| 357 | |
| 358 | end = pos + len; |
| 359 | |
| 360 | if (end - pos < 3) { |
| 361 | wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate " |
| 362 | "(left=%lu)", (unsigned long) left); |
| 363 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 364 | TLS_ALERT_DECODE_ERROR); |
| 365 | return -1; |
| 366 | } |
| 367 | |
| 368 | list_len = WPA_GET_BE24(pos); |
| 369 | pos += 3; |
| 370 | |
| 371 | if ((size_t) (end - pos) != list_len) { |
| 372 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate_list " |
| 373 | "length (len=%lu left=%lu)", |
| 374 | (unsigned long) list_len, |
| 375 | (unsigned long) (end - pos)); |
| 376 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 377 | TLS_ALERT_DECODE_ERROR); |
| 378 | return -1; |
| 379 | } |
| 380 | |
| 381 | idx = 0; |
| 382 | while (pos < end) { |
| 383 | if (end - pos < 3) { |
| 384 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse " |
| 385 | "certificate_list"); |
| 386 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 387 | TLS_ALERT_DECODE_ERROR); |
| 388 | x509_certificate_chain_free(chain); |
| 389 | return -1; |
| 390 | } |
| 391 | |
| 392 | cert_len = WPA_GET_BE24(pos); |
| 393 | pos += 3; |
| 394 | |
| 395 | if ((size_t) (end - pos) < cert_len) { |
| 396 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate " |
| 397 | "length (len=%lu left=%lu)", |
| 398 | (unsigned long) cert_len, |
| 399 | (unsigned long) (end - pos)); |
| 400 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 401 | TLS_ALERT_DECODE_ERROR); |
| 402 | x509_certificate_chain_free(chain); |
| 403 | return -1; |
| 404 | } |
| 405 | |
| 406 | wpa_printf(MSG_DEBUG, "TLSv1: Certificate %lu (len %lu)", |
| 407 | (unsigned long) idx, (unsigned long) cert_len); |
| 408 | |
| 409 | if (idx == 0) { |
| 410 | crypto_public_key_free(conn->client_rsa_key); |
| 411 | if (tls_parse_cert(pos, cert_len, |
| 412 | &conn->client_rsa_key)) { |
| 413 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse " |
| 414 | "the certificate"); |
| 415 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 416 | TLS_ALERT_BAD_CERTIFICATE); |
| 417 | x509_certificate_chain_free(chain); |
| 418 | return -1; |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | cert = x509_certificate_parse(pos, cert_len); |
| 423 | if (cert == NULL) { |
| 424 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse " |
| 425 | "the certificate"); |
| 426 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 427 | TLS_ALERT_BAD_CERTIFICATE); |
| 428 | x509_certificate_chain_free(chain); |
| 429 | return -1; |
| 430 | } |
| 431 | |
| 432 | if (last == NULL) |
| 433 | chain = cert; |
| 434 | else |
| 435 | last->next = cert; |
| 436 | last = cert; |
| 437 | |
| 438 | idx++; |
| 439 | pos += cert_len; |
| 440 | } |
| 441 | |
| 442 | if (x509_certificate_chain_validate(conn->cred->trusted_certs, chain, |
Dmitry Shmidt | c55524a | 2011-07-07 11:18:38 -0700 | [diff] [blame] | 443 | &reason, 0) < 0) { |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 444 | int tls_reason; |
| 445 | wpa_printf(MSG_DEBUG, "TLSv1: Server certificate chain " |
| 446 | "validation failed (reason=%d)", reason); |
| 447 | switch (reason) { |
| 448 | case X509_VALIDATE_BAD_CERTIFICATE: |
| 449 | tls_reason = TLS_ALERT_BAD_CERTIFICATE; |
| 450 | break; |
| 451 | case X509_VALIDATE_UNSUPPORTED_CERTIFICATE: |
| 452 | tls_reason = TLS_ALERT_UNSUPPORTED_CERTIFICATE; |
| 453 | break; |
| 454 | case X509_VALIDATE_CERTIFICATE_REVOKED: |
| 455 | tls_reason = TLS_ALERT_CERTIFICATE_REVOKED; |
| 456 | break; |
| 457 | case X509_VALIDATE_CERTIFICATE_EXPIRED: |
| 458 | tls_reason = TLS_ALERT_CERTIFICATE_EXPIRED; |
| 459 | break; |
| 460 | case X509_VALIDATE_CERTIFICATE_UNKNOWN: |
| 461 | tls_reason = TLS_ALERT_CERTIFICATE_UNKNOWN; |
| 462 | break; |
| 463 | case X509_VALIDATE_UNKNOWN_CA: |
| 464 | tls_reason = TLS_ALERT_UNKNOWN_CA; |
| 465 | break; |
| 466 | default: |
| 467 | tls_reason = TLS_ALERT_BAD_CERTIFICATE; |
| 468 | break; |
| 469 | } |
| 470 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, tls_reason); |
| 471 | x509_certificate_chain_free(chain); |
| 472 | return -1; |
| 473 | } |
| 474 | |
| 475 | x509_certificate_chain_free(chain); |
| 476 | |
| 477 | *in_len = end - in_data; |
| 478 | |
| 479 | conn->state = CLIENT_KEY_EXCHANGE; |
| 480 | |
| 481 | return 0; |
| 482 | } |
| 483 | |
| 484 | |
| 485 | static int tls_process_client_key_exchange_rsa( |
| 486 | struct tlsv1_server *conn, const u8 *pos, const u8 *end) |
| 487 | { |
| 488 | u8 *out; |
| 489 | size_t outlen, outbuflen; |
| 490 | u16 encr_len; |
| 491 | int res; |
| 492 | int use_random = 0; |
| 493 | |
| 494 | if (end - pos < 2) { |
| 495 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 496 | TLS_ALERT_DECODE_ERROR); |
| 497 | return -1; |
| 498 | } |
| 499 | |
| 500 | encr_len = WPA_GET_BE16(pos); |
| 501 | pos += 2; |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 502 | if (pos + encr_len > end) { |
| 503 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid ClientKeyExchange " |
| 504 | "format: encr_len=%u left=%u", |
| 505 | encr_len, (unsigned int) (end - pos)); |
| 506 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 507 | TLS_ALERT_DECODE_ERROR); |
| 508 | return -1; |
| 509 | } |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 510 | |
| 511 | outbuflen = outlen = end - pos; |
| 512 | out = os_malloc(outlen >= TLS_PRE_MASTER_SECRET_LEN ? |
| 513 | outlen : TLS_PRE_MASTER_SECRET_LEN); |
| 514 | if (out == NULL) { |
| 515 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 516 | TLS_ALERT_INTERNAL_ERROR); |
| 517 | return -1; |
| 518 | } |
| 519 | |
| 520 | /* |
| 521 | * struct { |
| 522 | * ProtocolVersion client_version; |
| 523 | * opaque random[46]; |
| 524 | * } PreMasterSecret; |
| 525 | * |
| 526 | * struct { |
| 527 | * public-key-encrypted PreMasterSecret pre_master_secret; |
| 528 | * } EncryptedPreMasterSecret; |
| 529 | */ |
| 530 | |
| 531 | /* |
| 532 | * Note: To avoid Bleichenbacher attack, we do not report decryption or |
| 533 | * parsing errors from EncryptedPreMasterSecret processing to the |
| 534 | * client. Instead, a random pre-master secret is used to force the |
| 535 | * handshake to fail. |
| 536 | */ |
| 537 | |
| 538 | if (crypto_private_key_decrypt_pkcs1_v15(conn->cred->key, |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 539 | pos, encr_len, |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 540 | out, &outlen) < 0) { |
| 541 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to decrypt " |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 542 | "PreMasterSecret (encr_len=%u outlen=%lu)", |
| 543 | encr_len, (unsigned long) outlen); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 544 | use_random = 1; |
| 545 | } |
| 546 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 547 | if (!use_random && outlen != TLS_PRE_MASTER_SECRET_LEN) { |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 548 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected PreMasterSecret " |
| 549 | "length %lu", (unsigned long) outlen); |
| 550 | use_random = 1; |
| 551 | } |
| 552 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 553 | if (!use_random && WPA_GET_BE16(out) != conn->client_version) { |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 554 | wpa_printf(MSG_DEBUG, "TLSv1: Client version in " |
| 555 | "ClientKeyExchange does not match with version in " |
| 556 | "ClientHello"); |
| 557 | use_random = 1; |
| 558 | } |
| 559 | |
| 560 | if (use_random) { |
| 561 | wpa_printf(MSG_DEBUG, "TLSv1: Using random premaster secret " |
| 562 | "to avoid revealing information about private key"); |
| 563 | outlen = TLS_PRE_MASTER_SECRET_LEN; |
| 564 | if (os_get_random(out, outlen)) { |
| 565 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to get random " |
| 566 | "data"); |
| 567 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 568 | TLS_ALERT_INTERNAL_ERROR); |
| 569 | os_free(out); |
| 570 | return -1; |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | res = tlsv1_server_derive_keys(conn, out, outlen); |
| 575 | |
| 576 | /* Clear the pre-master secret since it is not needed anymore */ |
| 577 | os_memset(out, 0, outbuflen); |
| 578 | os_free(out); |
| 579 | |
| 580 | if (res) { |
| 581 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys"); |
| 582 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 583 | TLS_ALERT_INTERNAL_ERROR); |
| 584 | return -1; |
| 585 | } |
| 586 | |
| 587 | return 0; |
| 588 | } |
| 589 | |
| 590 | |
| 591 | static int tls_process_client_key_exchange_dh_anon( |
| 592 | struct tlsv1_server *conn, const u8 *pos, const u8 *end) |
| 593 | { |
| 594 | const u8 *dh_yc; |
| 595 | u16 dh_yc_len; |
| 596 | u8 *shared; |
| 597 | size_t shared_len; |
| 598 | int res; |
| 599 | |
| 600 | /* |
| 601 | * struct { |
| 602 | * select (PublicValueEncoding) { |
| 603 | * case implicit: struct { }; |
| 604 | * case explicit: opaque dh_Yc<1..2^16-1>; |
| 605 | * } dh_public; |
| 606 | * } ClientDiffieHellmanPublic; |
| 607 | */ |
| 608 | |
| 609 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: ClientDiffieHellmanPublic", |
| 610 | pos, end - pos); |
| 611 | |
| 612 | if (end == pos) { |
| 613 | wpa_printf(MSG_DEBUG, "TLSv1: Implicit public value encoding " |
| 614 | "not supported"); |
| 615 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 616 | TLS_ALERT_INTERNAL_ERROR); |
| 617 | return -1; |
| 618 | } |
| 619 | |
| 620 | if (end - pos < 3) { |
| 621 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid client public value " |
| 622 | "length"); |
| 623 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 624 | TLS_ALERT_DECODE_ERROR); |
| 625 | return -1; |
| 626 | } |
| 627 | |
| 628 | dh_yc_len = WPA_GET_BE16(pos); |
| 629 | dh_yc = pos + 2; |
| 630 | |
| 631 | if (dh_yc + dh_yc_len > end) { |
| 632 | wpa_printf(MSG_DEBUG, "TLSv1: Client public value overflow " |
| 633 | "(length %d)", dh_yc_len); |
| 634 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 635 | TLS_ALERT_DECODE_ERROR); |
| 636 | return -1; |
| 637 | } |
| 638 | |
| 639 | wpa_hexdump(MSG_DEBUG, "TLSv1: DH Yc (client's public value)", |
| 640 | dh_yc, dh_yc_len); |
| 641 | |
| 642 | if (conn->cred == NULL || conn->cred->dh_p == NULL || |
| 643 | conn->dh_secret == NULL) { |
| 644 | wpa_printf(MSG_DEBUG, "TLSv1: No DH parameters available"); |
| 645 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 646 | TLS_ALERT_INTERNAL_ERROR); |
| 647 | return -1; |
| 648 | } |
| 649 | |
| 650 | shared_len = conn->cred->dh_p_len; |
| 651 | shared = os_malloc(shared_len); |
| 652 | if (shared == NULL) { |
| 653 | wpa_printf(MSG_DEBUG, "TLSv1: Could not allocate memory for " |
| 654 | "DH"); |
| 655 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 656 | TLS_ALERT_INTERNAL_ERROR); |
| 657 | return -1; |
| 658 | } |
| 659 | |
| 660 | /* shared = Yc^secret mod p */ |
| 661 | if (crypto_mod_exp(dh_yc, dh_yc_len, conn->dh_secret, |
| 662 | conn->dh_secret_len, |
| 663 | conn->cred->dh_p, conn->cred->dh_p_len, |
| 664 | shared, &shared_len)) { |
| 665 | os_free(shared); |
| 666 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 667 | TLS_ALERT_INTERNAL_ERROR); |
| 668 | return -1; |
| 669 | } |
| 670 | wpa_hexdump_key(MSG_DEBUG, "TLSv1: Shared secret from DH key exchange", |
| 671 | shared, shared_len); |
| 672 | |
| 673 | os_memset(conn->dh_secret, 0, conn->dh_secret_len); |
| 674 | os_free(conn->dh_secret); |
| 675 | conn->dh_secret = NULL; |
| 676 | |
| 677 | res = tlsv1_server_derive_keys(conn, shared, shared_len); |
| 678 | |
| 679 | /* Clear the pre-master secret since it is not needed anymore */ |
| 680 | os_memset(shared, 0, shared_len); |
| 681 | os_free(shared); |
| 682 | |
| 683 | if (res) { |
| 684 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys"); |
| 685 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 686 | TLS_ALERT_INTERNAL_ERROR); |
| 687 | return -1; |
| 688 | } |
| 689 | |
| 690 | return 0; |
| 691 | } |
| 692 | |
| 693 | |
| 694 | static int tls_process_client_key_exchange(struct tlsv1_server *conn, u8 ct, |
| 695 | const u8 *in_data, size_t *in_len) |
| 696 | { |
| 697 | const u8 *pos, *end; |
| 698 | size_t left, len; |
| 699 | u8 type; |
| 700 | tls_key_exchange keyx; |
| 701 | const struct tls_cipher_suite *suite; |
| 702 | |
| 703 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 704 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 705 | "received content type 0x%x", ct); |
| 706 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 707 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 708 | return -1; |
| 709 | } |
| 710 | |
| 711 | pos = in_data; |
| 712 | left = *in_len; |
| 713 | |
| 714 | if (left < 4) { |
| 715 | wpa_printf(MSG_DEBUG, "TLSv1: Too short ClientKeyExchange " |
| 716 | "(Left=%lu)", (unsigned long) left); |
| 717 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 718 | TLS_ALERT_DECODE_ERROR); |
| 719 | return -1; |
| 720 | } |
| 721 | |
| 722 | type = *pos++; |
| 723 | len = WPA_GET_BE24(pos); |
| 724 | pos += 3; |
| 725 | left -= 4; |
| 726 | |
| 727 | if (len > left) { |
| 728 | wpa_printf(MSG_DEBUG, "TLSv1: Mismatch in ClientKeyExchange " |
| 729 | "length (len=%lu != left=%lu)", |
| 730 | (unsigned long) len, (unsigned long) left); |
| 731 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 732 | TLS_ALERT_DECODE_ERROR); |
| 733 | return -1; |
| 734 | } |
| 735 | |
| 736 | end = pos + len; |
| 737 | |
| 738 | if (type != TLS_HANDSHAKE_TYPE_CLIENT_KEY_EXCHANGE) { |
| 739 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 740 | "message %d (expected ClientKeyExchange)", type); |
| 741 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 742 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 743 | return -1; |
| 744 | } |
| 745 | |
| 746 | wpa_printf(MSG_DEBUG, "TLSv1: Received ClientKeyExchange"); |
| 747 | |
| 748 | wpa_hexdump(MSG_DEBUG, "TLSv1: ClientKeyExchange", pos, len); |
| 749 | |
| 750 | suite = tls_get_cipher_suite(conn->rl.cipher_suite); |
| 751 | if (suite == NULL) |
| 752 | keyx = TLS_KEY_X_NULL; |
| 753 | else |
| 754 | keyx = suite->key_exchange; |
| 755 | |
| 756 | if (keyx == TLS_KEY_X_DH_anon && |
| 757 | tls_process_client_key_exchange_dh_anon(conn, pos, end) < 0) |
| 758 | return -1; |
| 759 | |
| 760 | if (keyx != TLS_KEY_X_DH_anon && |
| 761 | tls_process_client_key_exchange_rsa(conn, pos, end) < 0) |
| 762 | return -1; |
| 763 | |
| 764 | *in_len = end - in_data; |
| 765 | |
| 766 | conn->state = CERTIFICATE_VERIFY; |
| 767 | |
| 768 | return 0; |
| 769 | } |
| 770 | |
| 771 | |
| 772 | static int tls_process_certificate_verify(struct tlsv1_server *conn, u8 ct, |
| 773 | const u8 *in_data, size_t *in_len) |
| 774 | { |
| 775 | const u8 *pos, *end; |
| 776 | size_t left, len; |
| 777 | u8 type; |
| 778 | size_t hlen, buflen; |
| 779 | u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN], *hpos, *buf; |
| 780 | enum { SIGN_ALG_RSA, SIGN_ALG_DSA } alg = SIGN_ALG_RSA; |
| 781 | u16 slen; |
| 782 | |
| 783 | if (ct == TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC) { |
| 784 | if (conn->verify_peer) { |
| 785 | wpa_printf(MSG_DEBUG, "TLSv1: Client did not include " |
| 786 | "CertificateVerify"); |
| 787 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 788 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 789 | return -1; |
| 790 | } |
| 791 | |
| 792 | return tls_process_change_cipher_spec(conn, ct, in_data, |
| 793 | in_len); |
| 794 | } |
| 795 | |
| 796 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 797 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 798 | "received content type 0x%x", ct); |
| 799 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 800 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 801 | return -1; |
| 802 | } |
| 803 | |
| 804 | pos = in_data; |
| 805 | left = *in_len; |
| 806 | |
| 807 | if (left < 4) { |
| 808 | wpa_printf(MSG_DEBUG, "TLSv1: Too short CertificateVerify " |
| 809 | "message (len=%lu)", (unsigned long) left); |
| 810 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 811 | TLS_ALERT_DECODE_ERROR); |
| 812 | return -1; |
| 813 | } |
| 814 | |
| 815 | type = *pos++; |
| 816 | len = WPA_GET_BE24(pos); |
| 817 | pos += 3; |
| 818 | left -= 4; |
| 819 | |
| 820 | if (len > left) { |
| 821 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected CertificateVerify " |
| 822 | "message length (len=%lu != left=%lu)", |
| 823 | (unsigned long) len, (unsigned long) left); |
| 824 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 825 | TLS_ALERT_DECODE_ERROR); |
| 826 | return -1; |
| 827 | } |
| 828 | |
| 829 | end = pos + len; |
| 830 | |
| 831 | if (type != TLS_HANDSHAKE_TYPE_CERTIFICATE_VERIFY) { |
| 832 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 833 | "message %d (expected CertificateVerify)", type); |
| 834 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 835 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 836 | return -1; |
| 837 | } |
| 838 | |
| 839 | wpa_printf(MSG_DEBUG, "TLSv1: Received CertificateVerify"); |
| 840 | |
| 841 | /* |
| 842 | * struct { |
| 843 | * Signature signature; |
| 844 | * } CertificateVerify; |
| 845 | */ |
| 846 | |
| 847 | hpos = hash; |
| 848 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 849 | #ifdef CONFIG_TLSV12 |
| 850 | if (conn->rl.tls_version == TLS_VERSION_1_2) { |
| 851 | /* |
| 852 | * RFC 5246, 4.7: |
| 853 | * TLS v1.2 adds explicit indication of the used signature and |
| 854 | * hash algorithms. |
| 855 | * |
| 856 | * struct { |
| 857 | * HashAlgorithm hash; |
| 858 | * SignatureAlgorithm signature; |
| 859 | * } SignatureAndHashAlgorithm; |
| 860 | */ |
| 861 | if (end - pos < 2) { |
| 862 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 863 | TLS_ALERT_DECODE_ERROR); |
| 864 | return -1; |
| 865 | } |
| 866 | if (pos[0] != TLS_HASH_ALG_SHA256 || |
| 867 | pos[1] != TLS_SIGN_ALG_RSA) { |
| 868 | wpa_printf(MSG_DEBUG, "TLSv1.2: Unsupported hash(%u)/" |
| 869 | "signature(%u) algorithm", |
| 870 | pos[0], pos[1]); |
| 871 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 872 | TLS_ALERT_INTERNAL_ERROR); |
| 873 | return -1; |
| 874 | } |
| 875 | pos += 2; |
| 876 | |
| 877 | hlen = SHA256_MAC_LEN; |
| 878 | if (conn->verify.sha256_cert == NULL || |
| 879 | crypto_hash_finish(conn->verify.sha256_cert, hpos, &hlen) < |
| 880 | 0) { |
| 881 | conn->verify.sha256_cert = NULL; |
| 882 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 883 | TLS_ALERT_INTERNAL_ERROR); |
| 884 | return -1; |
| 885 | } |
| 886 | conn->verify.sha256_cert = NULL; |
| 887 | } else { |
| 888 | #endif /* CONFIG_TLSV12 */ |
| 889 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 890 | if (alg == SIGN_ALG_RSA) { |
| 891 | hlen = MD5_MAC_LEN; |
| 892 | if (conn->verify.md5_cert == NULL || |
| 893 | crypto_hash_finish(conn->verify.md5_cert, hpos, &hlen) < 0) |
| 894 | { |
| 895 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 896 | TLS_ALERT_INTERNAL_ERROR); |
| 897 | conn->verify.md5_cert = NULL; |
| 898 | crypto_hash_finish(conn->verify.sha1_cert, NULL, NULL); |
| 899 | conn->verify.sha1_cert = NULL; |
| 900 | return -1; |
| 901 | } |
| 902 | hpos += MD5_MAC_LEN; |
| 903 | } else |
| 904 | crypto_hash_finish(conn->verify.md5_cert, NULL, NULL); |
| 905 | |
| 906 | conn->verify.md5_cert = NULL; |
| 907 | hlen = SHA1_MAC_LEN; |
| 908 | if (conn->verify.sha1_cert == NULL || |
| 909 | crypto_hash_finish(conn->verify.sha1_cert, hpos, &hlen) < 0) { |
| 910 | conn->verify.sha1_cert = NULL; |
| 911 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 912 | TLS_ALERT_INTERNAL_ERROR); |
| 913 | return -1; |
| 914 | } |
| 915 | conn->verify.sha1_cert = NULL; |
| 916 | |
| 917 | if (alg == SIGN_ALG_RSA) |
| 918 | hlen += MD5_MAC_LEN; |
| 919 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 920 | #ifdef CONFIG_TLSV12 |
| 921 | } |
| 922 | #endif /* CONFIG_TLSV12 */ |
| 923 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 924 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: CertificateVerify hash", hash, hlen); |
| 925 | |
| 926 | if (end - pos < 2) { |
| 927 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 928 | TLS_ALERT_DECODE_ERROR); |
| 929 | return -1; |
| 930 | } |
| 931 | slen = WPA_GET_BE16(pos); |
| 932 | pos += 2; |
| 933 | if (end - pos < slen) { |
| 934 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 935 | TLS_ALERT_DECODE_ERROR); |
| 936 | return -1; |
| 937 | } |
| 938 | |
| 939 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: Signature", pos, end - pos); |
| 940 | if (conn->client_rsa_key == NULL) { |
| 941 | wpa_printf(MSG_DEBUG, "TLSv1: No client public key to verify " |
| 942 | "signature"); |
| 943 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 944 | TLS_ALERT_INTERNAL_ERROR); |
| 945 | return -1; |
| 946 | } |
| 947 | |
| 948 | buflen = end - pos; |
| 949 | buf = os_malloc(end - pos); |
| 950 | if (crypto_public_key_decrypt_pkcs1(conn->client_rsa_key, |
| 951 | pos, end - pos, buf, &buflen) < 0) |
| 952 | { |
| 953 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to decrypt signature"); |
| 954 | os_free(buf); |
| 955 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 956 | TLS_ALERT_DECRYPT_ERROR); |
| 957 | return -1; |
| 958 | } |
| 959 | |
| 960 | wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Decrypted Signature", |
| 961 | buf, buflen); |
| 962 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 963 | #ifdef CONFIG_TLSV12 |
| 964 | if (conn->rl.tls_version >= TLS_VERSION_1_2) { |
| 965 | /* |
| 966 | * RFC 3447, A.2.4 RSASSA-PKCS1-v1_5 |
| 967 | * |
| 968 | * DigestInfo ::= SEQUENCE { |
| 969 | * digestAlgorithm DigestAlgorithm, |
| 970 | * digest OCTET STRING |
| 971 | * } |
| 972 | * |
| 973 | * SHA-256 OID: sha256WithRSAEncryption ::= {pkcs-1 11} |
| 974 | * |
| 975 | * DER encoded DigestInfo for SHA256 per RFC 3447: |
| 976 | * 30 31 30 0d 06 09 60 86 48 01 65 03 04 02 01 05 00 04 20 || |
| 977 | * H |
| 978 | */ |
| 979 | if (buflen >= 19 + 32 && |
| 980 | os_memcmp(buf, "\x30\x31\x30\x0d\x06\x09\x60\x86\x48\x01" |
| 981 | "\x65\x03\x04\x02\x01\x05\x00\x04\x20", 19) == 0) |
| 982 | { |
| 983 | wpa_printf(MSG_DEBUG, "TLSv1.2: DigestAlgorithn = " |
| 984 | "SHA-256"); |
| 985 | os_memmove(buf, buf + 19, buflen - 19); |
| 986 | buflen -= 19; |
| 987 | } else { |
| 988 | wpa_printf(MSG_DEBUG, "TLSv1.2: Unrecognized " |
| 989 | "DigestInfo"); |
| 990 | os_free(buf); |
| 991 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 992 | TLS_ALERT_DECRYPT_ERROR); |
| 993 | return -1; |
| 994 | } |
| 995 | } |
| 996 | #endif /* CONFIG_TLSV12 */ |
| 997 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 998 | if (buflen != hlen || os_memcmp(buf, hash, buflen) != 0) { |
| 999 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid Signature in " |
| 1000 | "CertificateVerify - did not match with calculated " |
| 1001 | "hash"); |
| 1002 | os_free(buf); |
| 1003 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1004 | TLS_ALERT_DECRYPT_ERROR); |
| 1005 | return -1; |
| 1006 | } |
| 1007 | |
| 1008 | os_free(buf); |
| 1009 | |
| 1010 | *in_len = end - in_data; |
| 1011 | |
| 1012 | conn->state = CHANGE_CIPHER_SPEC; |
| 1013 | |
| 1014 | return 0; |
| 1015 | } |
| 1016 | |
| 1017 | |
| 1018 | static int tls_process_change_cipher_spec(struct tlsv1_server *conn, |
| 1019 | u8 ct, const u8 *in_data, |
| 1020 | size_t *in_len) |
| 1021 | { |
| 1022 | const u8 *pos; |
| 1023 | size_t left; |
| 1024 | |
| 1025 | if (ct != TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC) { |
| 1026 | wpa_printf(MSG_DEBUG, "TLSv1: Expected ChangeCipherSpec; " |
| 1027 | "received content type 0x%x", ct); |
| 1028 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1029 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 1030 | return -1; |
| 1031 | } |
| 1032 | |
| 1033 | pos = in_data; |
| 1034 | left = *in_len; |
| 1035 | |
| 1036 | if (left < 1) { |
| 1037 | wpa_printf(MSG_DEBUG, "TLSv1: Too short ChangeCipherSpec"); |
| 1038 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1039 | TLS_ALERT_DECODE_ERROR); |
| 1040 | return -1; |
| 1041 | } |
| 1042 | |
| 1043 | if (*pos != TLS_CHANGE_CIPHER_SPEC) { |
| 1044 | wpa_printf(MSG_DEBUG, "TLSv1: Expected ChangeCipherSpec; " |
| 1045 | "received data 0x%x", *pos); |
| 1046 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1047 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 1048 | return -1; |
| 1049 | } |
| 1050 | |
| 1051 | wpa_printf(MSG_DEBUG, "TLSv1: Received ChangeCipherSpec"); |
| 1052 | if (tlsv1_record_change_read_cipher(&conn->rl) < 0) { |
| 1053 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to change read cipher " |
| 1054 | "for record layer"); |
| 1055 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1056 | TLS_ALERT_INTERNAL_ERROR); |
| 1057 | return -1; |
| 1058 | } |
| 1059 | |
| 1060 | *in_len = pos + 1 - in_data; |
| 1061 | |
| 1062 | conn->state = CLIENT_FINISHED; |
| 1063 | |
| 1064 | return 0; |
| 1065 | } |
| 1066 | |
| 1067 | |
| 1068 | static int tls_process_client_finished(struct tlsv1_server *conn, u8 ct, |
| 1069 | const u8 *in_data, size_t *in_len) |
| 1070 | { |
| 1071 | const u8 *pos, *end; |
| 1072 | size_t left, len, hlen; |
| 1073 | u8 verify_data[TLS_VERIFY_DATA_LEN]; |
| 1074 | u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN]; |
| 1075 | |
| 1076 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 1077 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Finished; " |
| 1078 | "received content type 0x%x", ct); |
| 1079 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1080 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 1081 | return -1; |
| 1082 | } |
| 1083 | |
| 1084 | pos = in_data; |
| 1085 | left = *in_len; |
| 1086 | |
| 1087 | if (left < 4) { |
| 1088 | wpa_printf(MSG_DEBUG, "TLSv1: Too short record (left=%lu) for " |
| 1089 | "Finished", |
| 1090 | (unsigned long) left); |
| 1091 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1092 | TLS_ALERT_DECODE_ERROR); |
| 1093 | return -1; |
| 1094 | } |
| 1095 | |
| 1096 | if (pos[0] != TLS_HANDSHAKE_TYPE_FINISHED) { |
| 1097 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Finished; received " |
| 1098 | "type 0x%x", pos[0]); |
| 1099 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1100 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 1101 | return -1; |
| 1102 | } |
| 1103 | |
| 1104 | len = WPA_GET_BE24(pos + 1); |
| 1105 | |
| 1106 | pos += 4; |
| 1107 | left -= 4; |
| 1108 | |
| 1109 | if (len > left) { |
| 1110 | wpa_printf(MSG_DEBUG, "TLSv1: Too short buffer for Finished " |
| 1111 | "(len=%lu > left=%lu)", |
| 1112 | (unsigned long) len, (unsigned long) left); |
| 1113 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1114 | TLS_ALERT_DECODE_ERROR); |
| 1115 | return -1; |
| 1116 | } |
| 1117 | end = pos + len; |
| 1118 | if (len != TLS_VERIFY_DATA_LEN) { |
| 1119 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected verify_data length " |
| 1120 | "in Finished: %lu (expected %d)", |
| 1121 | (unsigned long) len, TLS_VERIFY_DATA_LEN); |
| 1122 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1123 | TLS_ALERT_DECODE_ERROR); |
| 1124 | return -1; |
| 1125 | } |
| 1126 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: verify_data in Finished", |
| 1127 | pos, TLS_VERIFY_DATA_LEN); |
| 1128 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 1129 | #ifdef CONFIG_TLSV12 |
| 1130 | if (conn->rl.tls_version >= TLS_VERSION_1_2) { |
| 1131 | hlen = SHA256_MAC_LEN; |
| 1132 | if (conn->verify.sha256_client == NULL || |
| 1133 | crypto_hash_finish(conn->verify.sha256_client, hash, &hlen) |
| 1134 | < 0) { |
| 1135 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1136 | TLS_ALERT_INTERNAL_ERROR); |
| 1137 | conn->verify.sha256_client = NULL; |
| 1138 | return -1; |
| 1139 | } |
| 1140 | conn->verify.sha256_client = NULL; |
| 1141 | } else { |
| 1142 | #endif /* CONFIG_TLSV12 */ |
| 1143 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1144 | hlen = MD5_MAC_LEN; |
| 1145 | if (conn->verify.md5_client == NULL || |
| 1146 | crypto_hash_finish(conn->verify.md5_client, hash, &hlen) < 0) { |
| 1147 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1148 | TLS_ALERT_INTERNAL_ERROR); |
| 1149 | conn->verify.md5_client = NULL; |
| 1150 | crypto_hash_finish(conn->verify.sha1_client, NULL, NULL); |
| 1151 | conn->verify.sha1_client = NULL; |
| 1152 | return -1; |
| 1153 | } |
| 1154 | conn->verify.md5_client = NULL; |
| 1155 | hlen = SHA1_MAC_LEN; |
| 1156 | if (conn->verify.sha1_client == NULL || |
| 1157 | crypto_hash_finish(conn->verify.sha1_client, hash + MD5_MAC_LEN, |
| 1158 | &hlen) < 0) { |
| 1159 | conn->verify.sha1_client = NULL; |
| 1160 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1161 | TLS_ALERT_INTERNAL_ERROR); |
| 1162 | return -1; |
| 1163 | } |
| 1164 | conn->verify.sha1_client = NULL; |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 1165 | hlen = MD5_MAC_LEN + SHA1_MAC_LEN; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1166 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame^] | 1167 | #ifdef CONFIG_TLSV12 |
| 1168 | } |
| 1169 | #endif /* CONFIG_TLSV12 */ |
| 1170 | |
| 1171 | if (tls_prf(conn->rl.tls_version, |
| 1172 | conn->master_secret, TLS_MASTER_SECRET_LEN, |
| 1173 | "client finished", hash, hlen, |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1174 | verify_data, TLS_VERIFY_DATA_LEN)) { |
| 1175 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive verify_data"); |
| 1176 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1177 | TLS_ALERT_DECRYPT_ERROR); |
| 1178 | return -1; |
| 1179 | } |
| 1180 | wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (client)", |
| 1181 | verify_data, TLS_VERIFY_DATA_LEN); |
| 1182 | |
| 1183 | if (os_memcmp(pos, verify_data, TLS_VERIFY_DATA_LEN) != 0) { |
| 1184 | wpa_printf(MSG_INFO, "TLSv1: Mismatch in verify_data"); |
| 1185 | return -1; |
| 1186 | } |
| 1187 | |
| 1188 | wpa_printf(MSG_DEBUG, "TLSv1: Received Finished"); |
| 1189 | |
| 1190 | *in_len = end - in_data; |
| 1191 | |
| 1192 | if (conn->use_session_ticket) { |
| 1193 | /* Abbreviated handshake using session ticket; RFC 4507 */ |
| 1194 | wpa_printf(MSG_DEBUG, "TLSv1: Abbreviated handshake completed " |
| 1195 | "successfully"); |
| 1196 | conn->state = ESTABLISHED; |
| 1197 | } else { |
| 1198 | /* Full handshake */ |
| 1199 | conn->state = SERVER_CHANGE_CIPHER_SPEC; |
| 1200 | } |
| 1201 | |
| 1202 | return 0; |
| 1203 | } |
| 1204 | |
| 1205 | |
| 1206 | int tlsv1_server_process_handshake(struct tlsv1_server *conn, u8 ct, |
| 1207 | const u8 *buf, size_t *len) |
| 1208 | { |
| 1209 | if (ct == TLS_CONTENT_TYPE_ALERT) { |
| 1210 | if (*len < 2) { |
| 1211 | wpa_printf(MSG_DEBUG, "TLSv1: Alert underflow"); |
| 1212 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1213 | TLS_ALERT_DECODE_ERROR); |
| 1214 | return -1; |
| 1215 | } |
| 1216 | wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d", |
| 1217 | buf[0], buf[1]); |
| 1218 | *len = 2; |
| 1219 | conn->state = FAILED; |
| 1220 | return -1; |
| 1221 | } |
| 1222 | |
| 1223 | switch (conn->state) { |
| 1224 | case CLIENT_HELLO: |
| 1225 | if (tls_process_client_hello(conn, ct, buf, len)) |
| 1226 | return -1; |
| 1227 | break; |
| 1228 | case CLIENT_CERTIFICATE: |
| 1229 | if (tls_process_certificate(conn, ct, buf, len)) |
| 1230 | return -1; |
| 1231 | break; |
| 1232 | case CLIENT_KEY_EXCHANGE: |
| 1233 | if (tls_process_client_key_exchange(conn, ct, buf, len)) |
| 1234 | return -1; |
| 1235 | break; |
| 1236 | case CERTIFICATE_VERIFY: |
| 1237 | if (tls_process_certificate_verify(conn, ct, buf, len)) |
| 1238 | return -1; |
| 1239 | break; |
| 1240 | case CHANGE_CIPHER_SPEC: |
| 1241 | if (tls_process_change_cipher_spec(conn, ct, buf, len)) |
| 1242 | return -1; |
| 1243 | break; |
| 1244 | case CLIENT_FINISHED: |
| 1245 | if (tls_process_client_finished(conn, ct, buf, len)) |
| 1246 | return -1; |
| 1247 | break; |
| 1248 | default: |
| 1249 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected state %d " |
| 1250 | "while processing received message", |
| 1251 | conn->state); |
| 1252 | return -1; |
| 1253 | } |
| 1254 | |
| 1255 | if (ct == TLS_CONTENT_TYPE_HANDSHAKE) |
| 1256 | tls_verify_hash_add(&conn->verify, buf, *len); |
| 1257 | |
| 1258 | return 0; |
| 1259 | } |