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 | * |
Dmitry Shmidt | c5ec7f5 | 2012-03-06 16:33:24 -0800 | [diff] [blame^] | 5 | * This software may be distributed under the terms of the BSD license. |
| 6 | * See README for more details. |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | #include "includes.h" |
| 10 | |
| 11 | #include "common.h" |
| 12 | #include "crypto/md5.h" |
| 13 | #include "crypto/sha1.h" |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 14 | #include "crypto/sha256.h" |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 15 | #include "crypto/tls.h" |
| 16 | #include "x509v3.h" |
| 17 | #include "tlsv1_common.h" |
| 18 | #include "tlsv1_record.h" |
| 19 | #include "tlsv1_server.h" |
| 20 | #include "tlsv1_server_i.h" |
| 21 | |
| 22 | |
| 23 | static int tls_process_client_key_exchange(struct tlsv1_server *conn, u8 ct, |
| 24 | const u8 *in_data, size_t *in_len); |
| 25 | static int tls_process_change_cipher_spec(struct tlsv1_server *conn, |
| 26 | u8 ct, const u8 *in_data, |
| 27 | size_t *in_len); |
| 28 | |
| 29 | |
| 30 | static int tls_process_client_hello(struct tlsv1_server *conn, u8 ct, |
| 31 | const u8 *in_data, size_t *in_len) |
| 32 | { |
| 33 | const u8 *pos, *end, *c; |
| 34 | size_t left, len, i, j; |
| 35 | u16 cipher_suite; |
| 36 | u16 num_suites; |
| 37 | int compr_null_found; |
| 38 | u16 ext_type, ext_len; |
| 39 | |
| 40 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 41 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 42 | "received content type 0x%x", ct); |
| 43 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 44 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 45 | return -1; |
| 46 | } |
| 47 | |
| 48 | pos = in_data; |
| 49 | left = *in_len; |
| 50 | |
| 51 | if (left < 4) |
| 52 | goto decode_error; |
| 53 | |
| 54 | /* HandshakeType msg_type */ |
| 55 | if (*pos != TLS_HANDSHAKE_TYPE_CLIENT_HELLO) { |
| 56 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 57 | "message %d (expected ClientHello)", *pos); |
| 58 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 59 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 60 | return -1; |
| 61 | } |
| 62 | wpa_printf(MSG_DEBUG, "TLSv1: Received ClientHello"); |
| 63 | pos++; |
| 64 | /* uint24 length */ |
| 65 | len = WPA_GET_BE24(pos); |
| 66 | pos += 3; |
| 67 | left -= 4; |
| 68 | |
| 69 | if (len > left) |
| 70 | goto decode_error; |
| 71 | |
| 72 | /* body - ClientHello */ |
| 73 | |
| 74 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: ClientHello", pos, len); |
| 75 | end = pos + len; |
| 76 | |
| 77 | /* ProtocolVersion client_version */ |
| 78 | if (end - pos < 2) |
| 79 | goto decode_error; |
| 80 | conn->client_version = WPA_GET_BE16(pos); |
| 81 | wpa_printf(MSG_DEBUG, "TLSv1: Client version %d.%d", |
| 82 | conn->client_version >> 8, conn->client_version & 0xff); |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 83 | if (conn->client_version < TLS_VERSION_1) { |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 84 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected protocol version in " |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 85 | "ClientHello %u.%u", |
| 86 | conn->client_version >> 8, |
| 87 | conn->client_version & 0xff); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 88 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 89 | TLS_ALERT_PROTOCOL_VERSION); |
| 90 | return -1; |
| 91 | } |
| 92 | pos += 2; |
| 93 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 94 | if (TLS_VERSION == TLS_VERSION_1) |
| 95 | conn->rl.tls_version = TLS_VERSION_1; |
| 96 | #ifdef CONFIG_TLSV12 |
| 97 | else if (conn->client_version >= TLS_VERSION_1_2) |
| 98 | conn->rl.tls_version = TLS_VERSION_1_2; |
| 99 | #endif /* CONFIG_TLSV12 */ |
| 100 | else if (conn->client_version > TLS_VERSION_1_1) |
| 101 | conn->rl.tls_version = TLS_VERSION_1_1; |
| 102 | else |
| 103 | conn->rl.tls_version = conn->client_version; |
| 104 | wpa_printf(MSG_DEBUG, "TLSv1: Using TLS v%s", |
| 105 | tls_version_str(conn->rl.tls_version)); |
| 106 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 107 | /* Random random */ |
| 108 | if (end - pos < TLS_RANDOM_LEN) |
| 109 | goto decode_error; |
| 110 | |
| 111 | os_memcpy(conn->client_random, pos, TLS_RANDOM_LEN); |
| 112 | pos += TLS_RANDOM_LEN; |
| 113 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: client_random", |
| 114 | conn->client_random, TLS_RANDOM_LEN); |
| 115 | |
| 116 | /* SessionID session_id */ |
| 117 | if (end - pos < 1) |
| 118 | goto decode_error; |
| 119 | if (end - pos < 1 + *pos || *pos > TLS_SESSION_ID_MAX_LEN) |
| 120 | goto decode_error; |
| 121 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: client session_id", pos + 1, *pos); |
| 122 | pos += 1 + *pos; |
| 123 | /* TODO: add support for session resumption */ |
| 124 | |
| 125 | /* CipherSuite cipher_suites<2..2^16-1> */ |
| 126 | if (end - pos < 2) |
| 127 | goto decode_error; |
| 128 | num_suites = WPA_GET_BE16(pos); |
| 129 | pos += 2; |
| 130 | if (end - pos < num_suites) |
| 131 | goto decode_error; |
| 132 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: client cipher suites", |
| 133 | pos, num_suites); |
| 134 | if (num_suites & 1) |
| 135 | goto decode_error; |
| 136 | num_suites /= 2; |
| 137 | |
| 138 | cipher_suite = 0; |
| 139 | for (i = 0; !cipher_suite && i < conn->num_cipher_suites; i++) { |
| 140 | c = pos; |
| 141 | for (j = 0; j < num_suites; j++) { |
| 142 | u16 tmp = WPA_GET_BE16(c); |
| 143 | c += 2; |
| 144 | if (!cipher_suite && tmp == conn->cipher_suites[i]) { |
| 145 | cipher_suite = tmp; |
| 146 | break; |
| 147 | } |
| 148 | } |
| 149 | } |
| 150 | pos += num_suites * 2; |
| 151 | if (!cipher_suite) { |
| 152 | wpa_printf(MSG_INFO, "TLSv1: No supported cipher suite " |
| 153 | "available"); |
| 154 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 155 | TLS_ALERT_ILLEGAL_PARAMETER); |
| 156 | return -1; |
| 157 | } |
| 158 | |
| 159 | if (tlsv1_record_set_cipher_suite(&conn->rl, cipher_suite) < 0) { |
| 160 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to set CipherSuite for " |
| 161 | "record layer"); |
| 162 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 163 | TLS_ALERT_INTERNAL_ERROR); |
| 164 | return -1; |
| 165 | } |
| 166 | |
| 167 | conn->cipher_suite = cipher_suite; |
| 168 | |
| 169 | /* CompressionMethod compression_methods<1..2^8-1> */ |
| 170 | if (end - pos < 1) |
| 171 | goto decode_error; |
| 172 | num_suites = *pos++; |
| 173 | if (end - pos < num_suites) |
| 174 | goto decode_error; |
| 175 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: client compression_methods", |
| 176 | pos, num_suites); |
| 177 | compr_null_found = 0; |
| 178 | for (i = 0; i < num_suites; i++) { |
| 179 | if (*pos++ == TLS_COMPRESSION_NULL) |
| 180 | compr_null_found = 1; |
| 181 | } |
| 182 | if (!compr_null_found) { |
| 183 | wpa_printf(MSG_INFO, "TLSv1: Client does not accept NULL " |
| 184 | "compression"); |
| 185 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 186 | TLS_ALERT_ILLEGAL_PARAMETER); |
| 187 | return -1; |
| 188 | } |
| 189 | |
| 190 | if (end - pos == 1) { |
| 191 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected extra octet in the " |
| 192 | "end of ClientHello: 0x%02x", *pos); |
| 193 | goto decode_error; |
| 194 | } |
| 195 | |
| 196 | if (end - pos >= 2) { |
| 197 | /* Extension client_hello_extension_list<0..2^16-1> */ |
| 198 | ext_len = WPA_GET_BE16(pos); |
| 199 | pos += 2; |
| 200 | |
| 201 | wpa_printf(MSG_DEBUG, "TLSv1: %u bytes of ClientHello " |
| 202 | "extensions", ext_len); |
| 203 | if (end - pos != ext_len) { |
| 204 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid ClientHello " |
| 205 | "extension list length %u (expected %u)", |
| 206 | ext_len, (unsigned int) (end - pos)); |
| 207 | goto decode_error; |
| 208 | } |
| 209 | |
| 210 | /* |
| 211 | * struct { |
| 212 | * ExtensionType extension_type (0..65535) |
| 213 | * opaque extension_data<0..2^16-1> |
| 214 | * } Extension; |
| 215 | */ |
| 216 | |
| 217 | while (pos < end) { |
| 218 | if (end - pos < 2) { |
| 219 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid " |
| 220 | "extension_type field"); |
| 221 | goto decode_error; |
| 222 | } |
| 223 | |
| 224 | ext_type = WPA_GET_BE16(pos); |
| 225 | pos += 2; |
| 226 | |
| 227 | if (end - pos < 2) { |
| 228 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid " |
| 229 | "extension_data length field"); |
| 230 | goto decode_error; |
| 231 | } |
| 232 | |
| 233 | ext_len = WPA_GET_BE16(pos); |
| 234 | pos += 2; |
| 235 | |
| 236 | if (end - pos < ext_len) { |
| 237 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid " |
| 238 | "extension_data field"); |
| 239 | goto decode_error; |
| 240 | } |
| 241 | |
| 242 | wpa_printf(MSG_DEBUG, "TLSv1: ClientHello Extension " |
| 243 | "type %u", ext_type); |
| 244 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: ClientHello " |
| 245 | "Extension data", pos, ext_len); |
| 246 | |
| 247 | if (ext_type == TLS_EXT_SESSION_TICKET) { |
| 248 | os_free(conn->session_ticket); |
| 249 | conn->session_ticket = os_malloc(ext_len); |
| 250 | if (conn->session_ticket) { |
| 251 | os_memcpy(conn->session_ticket, pos, |
| 252 | ext_len); |
| 253 | conn->session_ticket_len = ext_len; |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | pos += ext_len; |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | *in_len = end - in_data; |
| 262 | |
| 263 | wpa_printf(MSG_DEBUG, "TLSv1: ClientHello OK - proceed to " |
| 264 | "ServerHello"); |
| 265 | conn->state = SERVER_HELLO; |
| 266 | |
| 267 | return 0; |
| 268 | |
| 269 | decode_error: |
| 270 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to decode ClientHello"); |
| 271 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 272 | TLS_ALERT_DECODE_ERROR); |
| 273 | return -1; |
| 274 | } |
| 275 | |
| 276 | |
| 277 | static int tls_process_certificate(struct tlsv1_server *conn, u8 ct, |
| 278 | const u8 *in_data, size_t *in_len) |
| 279 | { |
| 280 | const u8 *pos, *end; |
| 281 | size_t left, len, list_len, cert_len, idx; |
| 282 | u8 type; |
| 283 | struct x509_certificate *chain = NULL, *last = NULL, *cert; |
| 284 | int reason; |
| 285 | |
| 286 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 287 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 288 | "received content type 0x%x", ct); |
| 289 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 290 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 291 | return -1; |
| 292 | } |
| 293 | |
| 294 | pos = in_data; |
| 295 | left = *in_len; |
| 296 | |
| 297 | if (left < 4) { |
| 298 | wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate message " |
| 299 | "(len=%lu)", (unsigned long) left); |
| 300 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 301 | TLS_ALERT_DECODE_ERROR); |
| 302 | return -1; |
| 303 | } |
| 304 | |
| 305 | type = *pos++; |
| 306 | len = WPA_GET_BE24(pos); |
| 307 | pos += 3; |
| 308 | left -= 4; |
| 309 | |
| 310 | if (len > left) { |
| 311 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected Certificate message " |
| 312 | "length (len=%lu != left=%lu)", |
| 313 | (unsigned long) len, (unsigned long) left); |
| 314 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 315 | TLS_ALERT_DECODE_ERROR); |
| 316 | return -1; |
| 317 | } |
| 318 | |
| 319 | if (type == TLS_HANDSHAKE_TYPE_CLIENT_KEY_EXCHANGE) { |
| 320 | if (conn->verify_peer) { |
| 321 | wpa_printf(MSG_DEBUG, "TLSv1: Client did not include " |
| 322 | "Certificate"); |
| 323 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 324 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 325 | return -1; |
| 326 | } |
| 327 | |
| 328 | return tls_process_client_key_exchange(conn, ct, in_data, |
| 329 | in_len); |
| 330 | } |
| 331 | if (type != TLS_HANDSHAKE_TYPE_CERTIFICATE) { |
| 332 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 333 | "message %d (expected Certificate/" |
| 334 | "ClientKeyExchange)", type); |
| 335 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 336 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 337 | return -1; |
| 338 | } |
| 339 | |
| 340 | wpa_printf(MSG_DEBUG, |
| 341 | "TLSv1: Received Certificate (certificate_list len %lu)", |
| 342 | (unsigned long) len); |
| 343 | |
| 344 | /* |
| 345 | * opaque ASN.1Cert<2^24-1>; |
| 346 | * |
| 347 | * struct { |
| 348 | * ASN.1Cert certificate_list<1..2^24-1>; |
| 349 | * } Certificate; |
| 350 | */ |
| 351 | |
| 352 | end = pos + len; |
| 353 | |
| 354 | if (end - pos < 3) { |
| 355 | wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate " |
| 356 | "(left=%lu)", (unsigned long) left); |
| 357 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 358 | TLS_ALERT_DECODE_ERROR); |
| 359 | return -1; |
| 360 | } |
| 361 | |
| 362 | list_len = WPA_GET_BE24(pos); |
| 363 | pos += 3; |
| 364 | |
| 365 | if ((size_t) (end - pos) != list_len) { |
| 366 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate_list " |
| 367 | "length (len=%lu left=%lu)", |
| 368 | (unsigned long) list_len, |
| 369 | (unsigned long) (end - pos)); |
| 370 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 371 | TLS_ALERT_DECODE_ERROR); |
| 372 | return -1; |
| 373 | } |
| 374 | |
| 375 | idx = 0; |
| 376 | while (pos < end) { |
| 377 | if (end - pos < 3) { |
| 378 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse " |
| 379 | "certificate_list"); |
| 380 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 381 | TLS_ALERT_DECODE_ERROR); |
| 382 | x509_certificate_chain_free(chain); |
| 383 | return -1; |
| 384 | } |
| 385 | |
| 386 | cert_len = WPA_GET_BE24(pos); |
| 387 | pos += 3; |
| 388 | |
| 389 | if ((size_t) (end - pos) < cert_len) { |
| 390 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate " |
| 391 | "length (len=%lu left=%lu)", |
| 392 | (unsigned long) cert_len, |
| 393 | (unsigned long) (end - pos)); |
| 394 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 395 | TLS_ALERT_DECODE_ERROR); |
| 396 | x509_certificate_chain_free(chain); |
| 397 | return -1; |
| 398 | } |
| 399 | |
| 400 | wpa_printf(MSG_DEBUG, "TLSv1: Certificate %lu (len %lu)", |
| 401 | (unsigned long) idx, (unsigned long) cert_len); |
| 402 | |
| 403 | if (idx == 0) { |
| 404 | crypto_public_key_free(conn->client_rsa_key); |
| 405 | if (tls_parse_cert(pos, cert_len, |
| 406 | &conn->client_rsa_key)) { |
| 407 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse " |
| 408 | "the certificate"); |
| 409 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 410 | TLS_ALERT_BAD_CERTIFICATE); |
| 411 | x509_certificate_chain_free(chain); |
| 412 | return -1; |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | cert = x509_certificate_parse(pos, cert_len); |
| 417 | if (cert == NULL) { |
| 418 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse " |
| 419 | "the certificate"); |
| 420 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 421 | TLS_ALERT_BAD_CERTIFICATE); |
| 422 | x509_certificate_chain_free(chain); |
| 423 | return -1; |
| 424 | } |
| 425 | |
| 426 | if (last == NULL) |
| 427 | chain = cert; |
| 428 | else |
| 429 | last->next = cert; |
| 430 | last = cert; |
| 431 | |
| 432 | idx++; |
| 433 | pos += cert_len; |
| 434 | } |
| 435 | |
| 436 | if (x509_certificate_chain_validate(conn->cred->trusted_certs, chain, |
Dmitry Shmidt | c55524a | 2011-07-07 11:18:38 -0700 | [diff] [blame] | 437 | &reason, 0) < 0) { |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 438 | int tls_reason; |
| 439 | wpa_printf(MSG_DEBUG, "TLSv1: Server certificate chain " |
| 440 | "validation failed (reason=%d)", reason); |
| 441 | switch (reason) { |
| 442 | case X509_VALIDATE_BAD_CERTIFICATE: |
| 443 | tls_reason = TLS_ALERT_BAD_CERTIFICATE; |
| 444 | break; |
| 445 | case X509_VALIDATE_UNSUPPORTED_CERTIFICATE: |
| 446 | tls_reason = TLS_ALERT_UNSUPPORTED_CERTIFICATE; |
| 447 | break; |
| 448 | case X509_VALIDATE_CERTIFICATE_REVOKED: |
| 449 | tls_reason = TLS_ALERT_CERTIFICATE_REVOKED; |
| 450 | break; |
| 451 | case X509_VALIDATE_CERTIFICATE_EXPIRED: |
| 452 | tls_reason = TLS_ALERT_CERTIFICATE_EXPIRED; |
| 453 | break; |
| 454 | case X509_VALIDATE_CERTIFICATE_UNKNOWN: |
| 455 | tls_reason = TLS_ALERT_CERTIFICATE_UNKNOWN; |
| 456 | break; |
| 457 | case X509_VALIDATE_UNKNOWN_CA: |
| 458 | tls_reason = TLS_ALERT_UNKNOWN_CA; |
| 459 | break; |
| 460 | default: |
| 461 | tls_reason = TLS_ALERT_BAD_CERTIFICATE; |
| 462 | break; |
| 463 | } |
| 464 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, tls_reason); |
| 465 | x509_certificate_chain_free(chain); |
| 466 | return -1; |
| 467 | } |
| 468 | |
| 469 | x509_certificate_chain_free(chain); |
| 470 | |
| 471 | *in_len = end - in_data; |
| 472 | |
| 473 | conn->state = CLIENT_KEY_EXCHANGE; |
| 474 | |
| 475 | return 0; |
| 476 | } |
| 477 | |
| 478 | |
| 479 | static int tls_process_client_key_exchange_rsa( |
| 480 | struct tlsv1_server *conn, const u8 *pos, const u8 *end) |
| 481 | { |
| 482 | u8 *out; |
| 483 | size_t outlen, outbuflen; |
| 484 | u16 encr_len; |
| 485 | int res; |
| 486 | int use_random = 0; |
| 487 | |
| 488 | if (end - pos < 2) { |
| 489 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 490 | TLS_ALERT_DECODE_ERROR); |
| 491 | return -1; |
| 492 | } |
| 493 | |
| 494 | encr_len = WPA_GET_BE16(pos); |
| 495 | pos += 2; |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 496 | if (pos + encr_len > end) { |
| 497 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid ClientKeyExchange " |
| 498 | "format: encr_len=%u left=%u", |
| 499 | encr_len, (unsigned int) (end - pos)); |
| 500 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 501 | TLS_ALERT_DECODE_ERROR); |
| 502 | return -1; |
| 503 | } |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 504 | |
| 505 | outbuflen = outlen = end - pos; |
| 506 | out = os_malloc(outlen >= TLS_PRE_MASTER_SECRET_LEN ? |
| 507 | outlen : TLS_PRE_MASTER_SECRET_LEN); |
| 508 | if (out == NULL) { |
| 509 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 510 | TLS_ALERT_INTERNAL_ERROR); |
| 511 | return -1; |
| 512 | } |
| 513 | |
| 514 | /* |
| 515 | * struct { |
| 516 | * ProtocolVersion client_version; |
| 517 | * opaque random[46]; |
| 518 | * } PreMasterSecret; |
| 519 | * |
| 520 | * struct { |
| 521 | * public-key-encrypted PreMasterSecret pre_master_secret; |
| 522 | * } EncryptedPreMasterSecret; |
| 523 | */ |
| 524 | |
| 525 | /* |
| 526 | * Note: To avoid Bleichenbacher attack, we do not report decryption or |
| 527 | * parsing errors from EncryptedPreMasterSecret processing to the |
| 528 | * client. Instead, a random pre-master secret is used to force the |
| 529 | * handshake to fail. |
| 530 | */ |
| 531 | |
| 532 | if (crypto_private_key_decrypt_pkcs1_v15(conn->cred->key, |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 533 | pos, encr_len, |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 534 | out, &outlen) < 0) { |
| 535 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to decrypt " |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 536 | "PreMasterSecret (encr_len=%u outlen=%lu)", |
| 537 | encr_len, (unsigned long) outlen); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 538 | use_random = 1; |
| 539 | } |
| 540 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 541 | if (!use_random && outlen != TLS_PRE_MASTER_SECRET_LEN) { |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 542 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected PreMasterSecret " |
| 543 | "length %lu", (unsigned long) outlen); |
| 544 | use_random = 1; |
| 545 | } |
| 546 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 547 | if (!use_random && WPA_GET_BE16(out) != conn->client_version) { |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 548 | wpa_printf(MSG_DEBUG, "TLSv1: Client version in " |
| 549 | "ClientKeyExchange does not match with version in " |
| 550 | "ClientHello"); |
| 551 | use_random = 1; |
| 552 | } |
| 553 | |
| 554 | if (use_random) { |
| 555 | wpa_printf(MSG_DEBUG, "TLSv1: Using random premaster secret " |
| 556 | "to avoid revealing information about private key"); |
| 557 | outlen = TLS_PRE_MASTER_SECRET_LEN; |
| 558 | if (os_get_random(out, outlen)) { |
| 559 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to get random " |
| 560 | "data"); |
| 561 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 562 | TLS_ALERT_INTERNAL_ERROR); |
| 563 | os_free(out); |
| 564 | return -1; |
| 565 | } |
| 566 | } |
| 567 | |
| 568 | res = tlsv1_server_derive_keys(conn, out, outlen); |
| 569 | |
| 570 | /* Clear the pre-master secret since it is not needed anymore */ |
| 571 | os_memset(out, 0, outbuflen); |
| 572 | os_free(out); |
| 573 | |
| 574 | if (res) { |
| 575 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys"); |
| 576 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 577 | TLS_ALERT_INTERNAL_ERROR); |
| 578 | return -1; |
| 579 | } |
| 580 | |
| 581 | return 0; |
| 582 | } |
| 583 | |
| 584 | |
| 585 | static int tls_process_client_key_exchange_dh_anon( |
| 586 | struct tlsv1_server *conn, const u8 *pos, const u8 *end) |
| 587 | { |
| 588 | const u8 *dh_yc; |
| 589 | u16 dh_yc_len; |
| 590 | u8 *shared; |
| 591 | size_t shared_len; |
| 592 | int res; |
| 593 | |
| 594 | /* |
| 595 | * struct { |
| 596 | * select (PublicValueEncoding) { |
| 597 | * case implicit: struct { }; |
| 598 | * case explicit: opaque dh_Yc<1..2^16-1>; |
| 599 | * } dh_public; |
| 600 | * } ClientDiffieHellmanPublic; |
| 601 | */ |
| 602 | |
| 603 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: ClientDiffieHellmanPublic", |
| 604 | pos, end - pos); |
| 605 | |
| 606 | if (end == pos) { |
| 607 | wpa_printf(MSG_DEBUG, "TLSv1: Implicit public value encoding " |
| 608 | "not supported"); |
| 609 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 610 | TLS_ALERT_INTERNAL_ERROR); |
| 611 | return -1; |
| 612 | } |
| 613 | |
| 614 | if (end - pos < 3) { |
| 615 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid client public value " |
| 616 | "length"); |
| 617 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 618 | TLS_ALERT_DECODE_ERROR); |
| 619 | return -1; |
| 620 | } |
| 621 | |
| 622 | dh_yc_len = WPA_GET_BE16(pos); |
| 623 | dh_yc = pos + 2; |
| 624 | |
| 625 | if (dh_yc + dh_yc_len > end) { |
| 626 | wpa_printf(MSG_DEBUG, "TLSv1: Client public value overflow " |
| 627 | "(length %d)", dh_yc_len); |
| 628 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 629 | TLS_ALERT_DECODE_ERROR); |
| 630 | return -1; |
| 631 | } |
| 632 | |
| 633 | wpa_hexdump(MSG_DEBUG, "TLSv1: DH Yc (client's public value)", |
| 634 | dh_yc, dh_yc_len); |
| 635 | |
| 636 | if (conn->cred == NULL || conn->cred->dh_p == NULL || |
| 637 | conn->dh_secret == NULL) { |
| 638 | wpa_printf(MSG_DEBUG, "TLSv1: No DH parameters available"); |
| 639 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 640 | TLS_ALERT_INTERNAL_ERROR); |
| 641 | return -1; |
| 642 | } |
| 643 | |
| 644 | shared_len = conn->cred->dh_p_len; |
| 645 | shared = os_malloc(shared_len); |
| 646 | if (shared == NULL) { |
| 647 | wpa_printf(MSG_DEBUG, "TLSv1: Could not allocate memory for " |
| 648 | "DH"); |
| 649 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 650 | TLS_ALERT_INTERNAL_ERROR); |
| 651 | return -1; |
| 652 | } |
| 653 | |
| 654 | /* shared = Yc^secret mod p */ |
| 655 | if (crypto_mod_exp(dh_yc, dh_yc_len, conn->dh_secret, |
| 656 | conn->dh_secret_len, |
| 657 | conn->cred->dh_p, conn->cred->dh_p_len, |
| 658 | shared, &shared_len)) { |
| 659 | os_free(shared); |
| 660 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 661 | TLS_ALERT_INTERNAL_ERROR); |
| 662 | return -1; |
| 663 | } |
| 664 | wpa_hexdump_key(MSG_DEBUG, "TLSv1: Shared secret from DH key exchange", |
| 665 | shared, shared_len); |
| 666 | |
| 667 | os_memset(conn->dh_secret, 0, conn->dh_secret_len); |
| 668 | os_free(conn->dh_secret); |
| 669 | conn->dh_secret = NULL; |
| 670 | |
| 671 | res = tlsv1_server_derive_keys(conn, shared, shared_len); |
| 672 | |
| 673 | /* Clear the pre-master secret since it is not needed anymore */ |
| 674 | os_memset(shared, 0, shared_len); |
| 675 | os_free(shared); |
| 676 | |
| 677 | if (res) { |
| 678 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys"); |
| 679 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 680 | TLS_ALERT_INTERNAL_ERROR); |
| 681 | return -1; |
| 682 | } |
| 683 | |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | |
| 688 | static int tls_process_client_key_exchange(struct tlsv1_server *conn, u8 ct, |
| 689 | const u8 *in_data, size_t *in_len) |
| 690 | { |
| 691 | const u8 *pos, *end; |
| 692 | size_t left, len; |
| 693 | u8 type; |
| 694 | tls_key_exchange keyx; |
| 695 | const struct tls_cipher_suite *suite; |
| 696 | |
| 697 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 698 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 699 | "received content type 0x%x", ct); |
| 700 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 701 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 702 | return -1; |
| 703 | } |
| 704 | |
| 705 | pos = in_data; |
| 706 | left = *in_len; |
| 707 | |
| 708 | if (left < 4) { |
| 709 | wpa_printf(MSG_DEBUG, "TLSv1: Too short ClientKeyExchange " |
| 710 | "(Left=%lu)", (unsigned long) left); |
| 711 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 712 | TLS_ALERT_DECODE_ERROR); |
| 713 | return -1; |
| 714 | } |
| 715 | |
| 716 | type = *pos++; |
| 717 | len = WPA_GET_BE24(pos); |
| 718 | pos += 3; |
| 719 | left -= 4; |
| 720 | |
| 721 | if (len > left) { |
| 722 | wpa_printf(MSG_DEBUG, "TLSv1: Mismatch in ClientKeyExchange " |
| 723 | "length (len=%lu != left=%lu)", |
| 724 | (unsigned long) len, (unsigned long) left); |
| 725 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 726 | TLS_ALERT_DECODE_ERROR); |
| 727 | return -1; |
| 728 | } |
| 729 | |
| 730 | end = pos + len; |
| 731 | |
| 732 | if (type != TLS_HANDSHAKE_TYPE_CLIENT_KEY_EXCHANGE) { |
| 733 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 734 | "message %d (expected ClientKeyExchange)", type); |
| 735 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 736 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 737 | return -1; |
| 738 | } |
| 739 | |
| 740 | wpa_printf(MSG_DEBUG, "TLSv1: Received ClientKeyExchange"); |
| 741 | |
| 742 | wpa_hexdump(MSG_DEBUG, "TLSv1: ClientKeyExchange", pos, len); |
| 743 | |
| 744 | suite = tls_get_cipher_suite(conn->rl.cipher_suite); |
| 745 | if (suite == NULL) |
| 746 | keyx = TLS_KEY_X_NULL; |
| 747 | else |
| 748 | keyx = suite->key_exchange; |
| 749 | |
| 750 | if (keyx == TLS_KEY_X_DH_anon && |
| 751 | tls_process_client_key_exchange_dh_anon(conn, pos, end) < 0) |
| 752 | return -1; |
| 753 | |
| 754 | if (keyx != TLS_KEY_X_DH_anon && |
| 755 | tls_process_client_key_exchange_rsa(conn, pos, end) < 0) |
| 756 | return -1; |
| 757 | |
| 758 | *in_len = end - in_data; |
| 759 | |
| 760 | conn->state = CERTIFICATE_VERIFY; |
| 761 | |
| 762 | return 0; |
| 763 | } |
| 764 | |
| 765 | |
| 766 | static int tls_process_certificate_verify(struct tlsv1_server *conn, u8 ct, |
| 767 | const u8 *in_data, size_t *in_len) |
| 768 | { |
| 769 | const u8 *pos, *end; |
| 770 | size_t left, len; |
| 771 | u8 type; |
| 772 | size_t hlen, buflen; |
| 773 | u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN], *hpos, *buf; |
| 774 | enum { SIGN_ALG_RSA, SIGN_ALG_DSA } alg = SIGN_ALG_RSA; |
| 775 | u16 slen; |
| 776 | |
| 777 | if (ct == TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC) { |
| 778 | if (conn->verify_peer) { |
| 779 | wpa_printf(MSG_DEBUG, "TLSv1: Client did not include " |
| 780 | "CertificateVerify"); |
| 781 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 782 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 783 | return -1; |
| 784 | } |
| 785 | |
| 786 | return tls_process_change_cipher_spec(conn, ct, in_data, |
| 787 | in_len); |
| 788 | } |
| 789 | |
| 790 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 791 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 792 | "received content type 0x%x", ct); |
| 793 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 794 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 795 | return -1; |
| 796 | } |
| 797 | |
| 798 | pos = in_data; |
| 799 | left = *in_len; |
| 800 | |
| 801 | if (left < 4) { |
| 802 | wpa_printf(MSG_DEBUG, "TLSv1: Too short CertificateVerify " |
| 803 | "message (len=%lu)", (unsigned long) left); |
| 804 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 805 | TLS_ALERT_DECODE_ERROR); |
| 806 | return -1; |
| 807 | } |
| 808 | |
| 809 | type = *pos++; |
| 810 | len = WPA_GET_BE24(pos); |
| 811 | pos += 3; |
| 812 | left -= 4; |
| 813 | |
| 814 | if (len > left) { |
| 815 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected CertificateVerify " |
| 816 | "message length (len=%lu != left=%lu)", |
| 817 | (unsigned long) len, (unsigned long) left); |
| 818 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 819 | TLS_ALERT_DECODE_ERROR); |
| 820 | return -1; |
| 821 | } |
| 822 | |
| 823 | end = pos + len; |
| 824 | |
| 825 | if (type != TLS_HANDSHAKE_TYPE_CERTIFICATE_VERIFY) { |
| 826 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 827 | "message %d (expected CertificateVerify)", type); |
| 828 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 829 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 830 | return -1; |
| 831 | } |
| 832 | |
| 833 | wpa_printf(MSG_DEBUG, "TLSv1: Received CertificateVerify"); |
| 834 | |
| 835 | /* |
| 836 | * struct { |
| 837 | * Signature signature; |
| 838 | * } CertificateVerify; |
| 839 | */ |
| 840 | |
| 841 | hpos = hash; |
| 842 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 843 | #ifdef CONFIG_TLSV12 |
| 844 | if (conn->rl.tls_version == TLS_VERSION_1_2) { |
| 845 | /* |
| 846 | * RFC 5246, 4.7: |
| 847 | * TLS v1.2 adds explicit indication of the used signature and |
| 848 | * hash algorithms. |
| 849 | * |
| 850 | * struct { |
| 851 | * HashAlgorithm hash; |
| 852 | * SignatureAlgorithm signature; |
| 853 | * } SignatureAndHashAlgorithm; |
| 854 | */ |
| 855 | if (end - pos < 2) { |
| 856 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 857 | TLS_ALERT_DECODE_ERROR); |
| 858 | return -1; |
| 859 | } |
| 860 | if (pos[0] != TLS_HASH_ALG_SHA256 || |
| 861 | pos[1] != TLS_SIGN_ALG_RSA) { |
| 862 | wpa_printf(MSG_DEBUG, "TLSv1.2: Unsupported hash(%u)/" |
| 863 | "signature(%u) algorithm", |
| 864 | pos[0], pos[1]); |
| 865 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 866 | TLS_ALERT_INTERNAL_ERROR); |
| 867 | return -1; |
| 868 | } |
| 869 | pos += 2; |
| 870 | |
| 871 | hlen = SHA256_MAC_LEN; |
| 872 | if (conn->verify.sha256_cert == NULL || |
| 873 | crypto_hash_finish(conn->verify.sha256_cert, hpos, &hlen) < |
| 874 | 0) { |
| 875 | conn->verify.sha256_cert = NULL; |
| 876 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 877 | TLS_ALERT_INTERNAL_ERROR); |
| 878 | return -1; |
| 879 | } |
| 880 | conn->verify.sha256_cert = NULL; |
| 881 | } else { |
| 882 | #endif /* CONFIG_TLSV12 */ |
| 883 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 884 | if (alg == SIGN_ALG_RSA) { |
| 885 | hlen = MD5_MAC_LEN; |
| 886 | if (conn->verify.md5_cert == NULL || |
| 887 | crypto_hash_finish(conn->verify.md5_cert, hpos, &hlen) < 0) |
| 888 | { |
| 889 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 890 | TLS_ALERT_INTERNAL_ERROR); |
| 891 | conn->verify.md5_cert = NULL; |
| 892 | crypto_hash_finish(conn->verify.sha1_cert, NULL, NULL); |
| 893 | conn->verify.sha1_cert = NULL; |
| 894 | return -1; |
| 895 | } |
| 896 | hpos += MD5_MAC_LEN; |
| 897 | } else |
| 898 | crypto_hash_finish(conn->verify.md5_cert, NULL, NULL); |
| 899 | |
| 900 | conn->verify.md5_cert = NULL; |
| 901 | hlen = SHA1_MAC_LEN; |
| 902 | if (conn->verify.sha1_cert == NULL || |
| 903 | crypto_hash_finish(conn->verify.sha1_cert, hpos, &hlen) < 0) { |
| 904 | conn->verify.sha1_cert = NULL; |
| 905 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 906 | TLS_ALERT_INTERNAL_ERROR); |
| 907 | return -1; |
| 908 | } |
| 909 | conn->verify.sha1_cert = NULL; |
| 910 | |
| 911 | if (alg == SIGN_ALG_RSA) |
| 912 | hlen += MD5_MAC_LEN; |
| 913 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 914 | #ifdef CONFIG_TLSV12 |
| 915 | } |
| 916 | #endif /* CONFIG_TLSV12 */ |
| 917 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 918 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: CertificateVerify hash", hash, hlen); |
| 919 | |
| 920 | if (end - pos < 2) { |
| 921 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 922 | TLS_ALERT_DECODE_ERROR); |
| 923 | return -1; |
| 924 | } |
| 925 | slen = WPA_GET_BE16(pos); |
| 926 | pos += 2; |
| 927 | if (end - pos < slen) { |
| 928 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 929 | TLS_ALERT_DECODE_ERROR); |
| 930 | return -1; |
| 931 | } |
| 932 | |
| 933 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: Signature", pos, end - pos); |
| 934 | if (conn->client_rsa_key == NULL) { |
| 935 | wpa_printf(MSG_DEBUG, "TLSv1: No client public key to verify " |
| 936 | "signature"); |
| 937 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 938 | TLS_ALERT_INTERNAL_ERROR); |
| 939 | return -1; |
| 940 | } |
| 941 | |
| 942 | buflen = end - pos; |
| 943 | buf = os_malloc(end - pos); |
| 944 | if (crypto_public_key_decrypt_pkcs1(conn->client_rsa_key, |
| 945 | pos, end - pos, buf, &buflen) < 0) |
| 946 | { |
| 947 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to decrypt signature"); |
| 948 | os_free(buf); |
| 949 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 950 | TLS_ALERT_DECRYPT_ERROR); |
| 951 | return -1; |
| 952 | } |
| 953 | |
| 954 | wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Decrypted Signature", |
| 955 | buf, buflen); |
| 956 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 957 | #ifdef CONFIG_TLSV12 |
| 958 | if (conn->rl.tls_version >= TLS_VERSION_1_2) { |
| 959 | /* |
| 960 | * RFC 3447, A.2.4 RSASSA-PKCS1-v1_5 |
| 961 | * |
| 962 | * DigestInfo ::= SEQUENCE { |
| 963 | * digestAlgorithm DigestAlgorithm, |
| 964 | * digest OCTET STRING |
| 965 | * } |
| 966 | * |
| 967 | * SHA-256 OID: sha256WithRSAEncryption ::= {pkcs-1 11} |
| 968 | * |
| 969 | * DER encoded DigestInfo for SHA256 per RFC 3447: |
| 970 | * 30 31 30 0d 06 09 60 86 48 01 65 03 04 02 01 05 00 04 20 || |
| 971 | * H |
| 972 | */ |
| 973 | if (buflen >= 19 + 32 && |
| 974 | os_memcmp(buf, "\x30\x31\x30\x0d\x06\x09\x60\x86\x48\x01" |
| 975 | "\x65\x03\x04\x02\x01\x05\x00\x04\x20", 19) == 0) |
| 976 | { |
| 977 | wpa_printf(MSG_DEBUG, "TLSv1.2: DigestAlgorithn = " |
| 978 | "SHA-256"); |
| 979 | os_memmove(buf, buf + 19, buflen - 19); |
| 980 | buflen -= 19; |
| 981 | } else { |
| 982 | wpa_printf(MSG_DEBUG, "TLSv1.2: Unrecognized " |
| 983 | "DigestInfo"); |
| 984 | os_free(buf); |
| 985 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 986 | TLS_ALERT_DECRYPT_ERROR); |
| 987 | return -1; |
| 988 | } |
| 989 | } |
| 990 | #endif /* CONFIG_TLSV12 */ |
| 991 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 992 | if (buflen != hlen || os_memcmp(buf, hash, buflen) != 0) { |
| 993 | wpa_printf(MSG_DEBUG, "TLSv1: Invalid Signature in " |
| 994 | "CertificateVerify - did not match with calculated " |
| 995 | "hash"); |
| 996 | os_free(buf); |
| 997 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 998 | TLS_ALERT_DECRYPT_ERROR); |
| 999 | return -1; |
| 1000 | } |
| 1001 | |
| 1002 | os_free(buf); |
| 1003 | |
| 1004 | *in_len = end - in_data; |
| 1005 | |
| 1006 | conn->state = CHANGE_CIPHER_SPEC; |
| 1007 | |
| 1008 | return 0; |
| 1009 | } |
| 1010 | |
| 1011 | |
| 1012 | static int tls_process_change_cipher_spec(struct tlsv1_server *conn, |
| 1013 | u8 ct, const u8 *in_data, |
| 1014 | size_t *in_len) |
| 1015 | { |
| 1016 | const u8 *pos; |
| 1017 | size_t left; |
| 1018 | |
| 1019 | if (ct != TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC) { |
| 1020 | wpa_printf(MSG_DEBUG, "TLSv1: Expected ChangeCipherSpec; " |
| 1021 | "received content type 0x%x", ct); |
| 1022 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1023 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 1024 | return -1; |
| 1025 | } |
| 1026 | |
| 1027 | pos = in_data; |
| 1028 | left = *in_len; |
| 1029 | |
| 1030 | if (left < 1) { |
| 1031 | wpa_printf(MSG_DEBUG, "TLSv1: Too short ChangeCipherSpec"); |
| 1032 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1033 | TLS_ALERT_DECODE_ERROR); |
| 1034 | return -1; |
| 1035 | } |
| 1036 | |
| 1037 | if (*pos != TLS_CHANGE_CIPHER_SPEC) { |
| 1038 | wpa_printf(MSG_DEBUG, "TLSv1: Expected ChangeCipherSpec; " |
| 1039 | "received data 0x%x", *pos); |
| 1040 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1041 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 1042 | return -1; |
| 1043 | } |
| 1044 | |
| 1045 | wpa_printf(MSG_DEBUG, "TLSv1: Received ChangeCipherSpec"); |
| 1046 | if (tlsv1_record_change_read_cipher(&conn->rl) < 0) { |
| 1047 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to change read cipher " |
| 1048 | "for record layer"); |
| 1049 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1050 | TLS_ALERT_INTERNAL_ERROR); |
| 1051 | return -1; |
| 1052 | } |
| 1053 | |
| 1054 | *in_len = pos + 1 - in_data; |
| 1055 | |
| 1056 | conn->state = CLIENT_FINISHED; |
| 1057 | |
| 1058 | return 0; |
| 1059 | } |
| 1060 | |
| 1061 | |
| 1062 | static int tls_process_client_finished(struct tlsv1_server *conn, u8 ct, |
| 1063 | const u8 *in_data, size_t *in_len) |
| 1064 | { |
| 1065 | const u8 *pos, *end; |
| 1066 | size_t left, len, hlen; |
| 1067 | u8 verify_data[TLS_VERIFY_DATA_LEN]; |
| 1068 | u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN]; |
| 1069 | |
| 1070 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 1071 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Finished; " |
| 1072 | "received content type 0x%x", ct); |
| 1073 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1074 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 1075 | return -1; |
| 1076 | } |
| 1077 | |
| 1078 | pos = in_data; |
| 1079 | left = *in_len; |
| 1080 | |
| 1081 | if (left < 4) { |
| 1082 | wpa_printf(MSG_DEBUG, "TLSv1: Too short record (left=%lu) for " |
| 1083 | "Finished", |
| 1084 | (unsigned long) left); |
| 1085 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1086 | TLS_ALERT_DECODE_ERROR); |
| 1087 | return -1; |
| 1088 | } |
| 1089 | |
| 1090 | if (pos[0] != TLS_HANDSHAKE_TYPE_FINISHED) { |
| 1091 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Finished; received " |
| 1092 | "type 0x%x", pos[0]); |
| 1093 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1094 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 1095 | return -1; |
| 1096 | } |
| 1097 | |
| 1098 | len = WPA_GET_BE24(pos + 1); |
| 1099 | |
| 1100 | pos += 4; |
| 1101 | left -= 4; |
| 1102 | |
| 1103 | if (len > left) { |
| 1104 | wpa_printf(MSG_DEBUG, "TLSv1: Too short buffer for Finished " |
| 1105 | "(len=%lu > left=%lu)", |
| 1106 | (unsigned long) len, (unsigned long) left); |
| 1107 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1108 | TLS_ALERT_DECODE_ERROR); |
| 1109 | return -1; |
| 1110 | } |
| 1111 | end = pos + len; |
| 1112 | if (len != TLS_VERIFY_DATA_LEN) { |
| 1113 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected verify_data length " |
| 1114 | "in Finished: %lu (expected %d)", |
| 1115 | (unsigned long) len, TLS_VERIFY_DATA_LEN); |
| 1116 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1117 | TLS_ALERT_DECODE_ERROR); |
| 1118 | return -1; |
| 1119 | } |
| 1120 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: verify_data in Finished", |
| 1121 | pos, TLS_VERIFY_DATA_LEN); |
| 1122 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 1123 | #ifdef CONFIG_TLSV12 |
| 1124 | if (conn->rl.tls_version >= TLS_VERSION_1_2) { |
| 1125 | hlen = SHA256_MAC_LEN; |
| 1126 | if (conn->verify.sha256_client == NULL || |
| 1127 | crypto_hash_finish(conn->verify.sha256_client, hash, &hlen) |
| 1128 | < 0) { |
| 1129 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1130 | TLS_ALERT_INTERNAL_ERROR); |
| 1131 | conn->verify.sha256_client = NULL; |
| 1132 | return -1; |
| 1133 | } |
| 1134 | conn->verify.sha256_client = NULL; |
| 1135 | } else { |
| 1136 | #endif /* CONFIG_TLSV12 */ |
| 1137 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1138 | hlen = MD5_MAC_LEN; |
| 1139 | if (conn->verify.md5_client == NULL || |
| 1140 | crypto_hash_finish(conn->verify.md5_client, hash, &hlen) < 0) { |
| 1141 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1142 | TLS_ALERT_INTERNAL_ERROR); |
| 1143 | conn->verify.md5_client = NULL; |
| 1144 | crypto_hash_finish(conn->verify.sha1_client, NULL, NULL); |
| 1145 | conn->verify.sha1_client = NULL; |
| 1146 | return -1; |
| 1147 | } |
| 1148 | conn->verify.md5_client = NULL; |
| 1149 | hlen = SHA1_MAC_LEN; |
| 1150 | if (conn->verify.sha1_client == NULL || |
| 1151 | crypto_hash_finish(conn->verify.sha1_client, hash + MD5_MAC_LEN, |
| 1152 | &hlen) < 0) { |
| 1153 | conn->verify.sha1_client = NULL; |
| 1154 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1155 | TLS_ALERT_INTERNAL_ERROR); |
| 1156 | return -1; |
| 1157 | } |
| 1158 | conn->verify.sha1_client = NULL; |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 1159 | hlen = MD5_MAC_LEN + SHA1_MAC_LEN; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1160 | |
Dmitry Shmidt | 1f69aa5 | 2012-01-24 16:10:04 -0800 | [diff] [blame] | 1161 | #ifdef CONFIG_TLSV12 |
| 1162 | } |
| 1163 | #endif /* CONFIG_TLSV12 */ |
| 1164 | |
| 1165 | if (tls_prf(conn->rl.tls_version, |
| 1166 | conn->master_secret, TLS_MASTER_SECRET_LEN, |
| 1167 | "client finished", hash, hlen, |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1168 | verify_data, TLS_VERIFY_DATA_LEN)) { |
| 1169 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive verify_data"); |
| 1170 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1171 | TLS_ALERT_DECRYPT_ERROR); |
| 1172 | return -1; |
| 1173 | } |
| 1174 | wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (client)", |
| 1175 | verify_data, TLS_VERIFY_DATA_LEN); |
| 1176 | |
| 1177 | if (os_memcmp(pos, verify_data, TLS_VERIFY_DATA_LEN) != 0) { |
| 1178 | wpa_printf(MSG_INFO, "TLSv1: Mismatch in verify_data"); |
| 1179 | return -1; |
| 1180 | } |
| 1181 | |
| 1182 | wpa_printf(MSG_DEBUG, "TLSv1: Received Finished"); |
| 1183 | |
| 1184 | *in_len = end - in_data; |
| 1185 | |
| 1186 | if (conn->use_session_ticket) { |
| 1187 | /* Abbreviated handshake using session ticket; RFC 4507 */ |
| 1188 | wpa_printf(MSG_DEBUG, "TLSv1: Abbreviated handshake completed " |
| 1189 | "successfully"); |
| 1190 | conn->state = ESTABLISHED; |
| 1191 | } else { |
| 1192 | /* Full handshake */ |
| 1193 | conn->state = SERVER_CHANGE_CIPHER_SPEC; |
| 1194 | } |
| 1195 | |
| 1196 | return 0; |
| 1197 | } |
| 1198 | |
| 1199 | |
| 1200 | int tlsv1_server_process_handshake(struct tlsv1_server *conn, u8 ct, |
| 1201 | const u8 *buf, size_t *len) |
| 1202 | { |
| 1203 | if (ct == TLS_CONTENT_TYPE_ALERT) { |
| 1204 | if (*len < 2) { |
| 1205 | wpa_printf(MSG_DEBUG, "TLSv1: Alert underflow"); |
| 1206 | tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1207 | TLS_ALERT_DECODE_ERROR); |
| 1208 | return -1; |
| 1209 | } |
| 1210 | wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d", |
| 1211 | buf[0], buf[1]); |
| 1212 | *len = 2; |
| 1213 | conn->state = FAILED; |
| 1214 | return -1; |
| 1215 | } |
| 1216 | |
| 1217 | switch (conn->state) { |
| 1218 | case CLIENT_HELLO: |
| 1219 | if (tls_process_client_hello(conn, ct, buf, len)) |
| 1220 | return -1; |
| 1221 | break; |
| 1222 | case CLIENT_CERTIFICATE: |
| 1223 | if (tls_process_certificate(conn, ct, buf, len)) |
| 1224 | return -1; |
| 1225 | break; |
| 1226 | case CLIENT_KEY_EXCHANGE: |
| 1227 | if (tls_process_client_key_exchange(conn, ct, buf, len)) |
| 1228 | return -1; |
| 1229 | break; |
| 1230 | case CERTIFICATE_VERIFY: |
| 1231 | if (tls_process_certificate_verify(conn, ct, buf, len)) |
| 1232 | return -1; |
| 1233 | break; |
| 1234 | case CHANGE_CIPHER_SPEC: |
| 1235 | if (tls_process_change_cipher_spec(conn, ct, buf, len)) |
| 1236 | return -1; |
| 1237 | break; |
| 1238 | case CLIENT_FINISHED: |
| 1239 | if (tls_process_client_finished(conn, ct, buf, len)) |
| 1240 | return -1; |
| 1241 | break; |
| 1242 | default: |
| 1243 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected state %d " |
| 1244 | "while processing received message", |
| 1245 | conn->state); |
| 1246 | return -1; |
| 1247 | } |
| 1248 | |
| 1249 | if (ct == TLS_CONTENT_TYPE_HANDSHAKE) |
| 1250 | tls_verify_hash_add(&conn->verify, buf, *len); |
| 1251 | |
| 1252 | return 0; |
| 1253 | } |