The Android Open Source Project | 845e012 | 2009-03-03 19:31:34 -0800 | [diff] [blame] | 1 | /* |
| 2 | * wpa_supplicant: TLSv1 client (RFC 2246) |
| 3 | * Copyright (c) 2006, Jouni Malinen <j@w1.fi> |
| 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 "base64.h" |
| 19 | #include "md5.h" |
| 20 | #include "sha1.h" |
| 21 | #include "crypto.h" |
| 22 | #include "tls.h" |
| 23 | #include "tlsv1_common.h" |
| 24 | #include "tlsv1_client.h" |
| 25 | #include "x509v3.h" |
| 26 | |
| 27 | /* TODO: |
| 28 | * Support for a message fragmented across several records (RFC 2246, 6.2.1) |
| 29 | */ |
| 30 | |
| 31 | struct tlsv1_client { |
| 32 | enum { |
| 33 | CLIENT_HELLO, SERVER_HELLO, SERVER_CERTIFICATE, |
| 34 | SERVER_KEY_EXCHANGE, SERVER_CERTIFICATE_REQUEST, |
| 35 | SERVER_HELLO_DONE, CLIENT_KEY_EXCHANGE, CHANGE_CIPHER_SPEC, |
| 36 | SERVER_CHANGE_CIPHER_SPEC, SERVER_FINISHED, ACK_FINISHED, |
| 37 | ESTABLISHED, FAILED |
| 38 | } state; |
| 39 | |
| 40 | struct tlsv1_record_layer rl; |
| 41 | |
| 42 | u8 session_id[TLS_SESSION_ID_MAX_LEN]; |
| 43 | size_t session_id_len; |
| 44 | u8 client_random[TLS_RANDOM_LEN]; |
| 45 | u8 server_random[TLS_RANDOM_LEN]; |
| 46 | u8 master_secret[TLS_MASTER_SECRET_LEN]; |
| 47 | |
| 48 | u8 alert_level; |
| 49 | u8 alert_description; |
| 50 | |
| 51 | unsigned int certificate_requested:1; |
| 52 | unsigned int session_resumed:1; |
| 53 | unsigned int ticket:1; |
| 54 | unsigned int ticket_key:1; |
| 55 | |
| 56 | struct crypto_public_key *server_rsa_key; |
| 57 | |
| 58 | struct crypto_hash *verify_md5_client; |
| 59 | struct crypto_hash *verify_sha1_client; |
| 60 | struct crypto_hash *verify_md5_server; |
| 61 | struct crypto_hash *verify_sha1_server; |
| 62 | struct crypto_hash *verify_md5_cert; |
| 63 | struct crypto_hash *verify_sha1_cert; |
| 64 | |
| 65 | #define MAX_CIPHER_COUNT 30 |
| 66 | u16 cipher_suites[MAX_CIPHER_COUNT]; |
| 67 | size_t num_cipher_suites; |
| 68 | |
| 69 | u16 prev_cipher_suite; |
| 70 | |
| 71 | u8 *client_hello_ext; |
| 72 | size_t client_hello_ext_len; |
| 73 | |
| 74 | /* The prime modulus used for Diffie-Hellman */ |
| 75 | u8 *dh_p; |
| 76 | size_t dh_p_len; |
| 77 | /* The generator used for Diffie-Hellman */ |
| 78 | u8 *dh_g; |
| 79 | size_t dh_g_len; |
| 80 | /* The server's Diffie-Hellman public value */ |
| 81 | u8 *dh_ys; |
| 82 | size_t dh_ys_len; |
| 83 | |
| 84 | struct x509_certificate *trusted_certs; |
| 85 | struct x509_certificate *client_cert; |
| 86 | struct crypto_private_key *client_key; |
| 87 | }; |
| 88 | |
| 89 | |
| 90 | static int tls_derive_keys(struct tlsv1_client *conn, |
| 91 | const u8 *pre_master_secret, |
| 92 | size_t pre_master_secret_len); |
| 93 | static int tls_process_server_key_exchange(struct tlsv1_client *conn, u8 ct, |
| 94 | const u8 *in_data, size_t *in_len); |
| 95 | static int tls_process_certificate_request(struct tlsv1_client *conn, u8 ct, |
| 96 | const u8 *in_data, size_t *in_len); |
| 97 | static int tls_process_server_hello_done(struct tlsv1_client *conn, u8 ct, |
| 98 | const u8 *in_data, size_t *in_len); |
| 99 | |
| 100 | |
| 101 | static void tls_alert(struct tlsv1_client *conn, u8 level, u8 description) |
| 102 | { |
| 103 | conn->alert_level = level; |
| 104 | conn->alert_description = description; |
| 105 | } |
| 106 | |
| 107 | |
| 108 | static void tls_verify_hash_add(struct tlsv1_client *conn, const u8 *buf, |
| 109 | size_t len) |
| 110 | { |
| 111 | if (conn->verify_md5_client && conn->verify_sha1_client) { |
| 112 | crypto_hash_update(conn->verify_md5_client, buf, len); |
| 113 | crypto_hash_update(conn->verify_sha1_client, buf, len); |
| 114 | } |
| 115 | if (conn->verify_md5_server && conn->verify_sha1_server) { |
| 116 | crypto_hash_update(conn->verify_md5_server, buf, len); |
| 117 | crypto_hash_update(conn->verify_sha1_server, buf, len); |
| 118 | } |
| 119 | if (conn->verify_md5_cert && conn->verify_sha1_cert) { |
| 120 | crypto_hash_update(conn->verify_md5_cert, buf, len); |
| 121 | crypto_hash_update(conn->verify_sha1_cert, buf, len); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | |
| 126 | static u8 * tls_send_alert(struct tlsv1_client *conn, |
| 127 | u8 level, u8 description, |
| 128 | size_t *out_len) |
| 129 | { |
| 130 | u8 *alert, *pos, *length; |
| 131 | |
| 132 | wpa_printf(MSG_DEBUG, "TLSv1: Send Alert(%d:%d)", level, description); |
| 133 | *out_len = 0; |
| 134 | |
| 135 | alert = os_malloc(10); |
| 136 | if (alert == NULL) |
| 137 | return NULL; |
| 138 | |
| 139 | pos = alert; |
| 140 | |
| 141 | /* TLSPlaintext */ |
| 142 | /* ContentType type */ |
| 143 | *pos++ = TLS_CONTENT_TYPE_ALERT; |
| 144 | /* ProtocolVersion version */ |
| 145 | WPA_PUT_BE16(pos, TLS_VERSION); |
| 146 | pos += 2; |
| 147 | /* uint16 length (to be filled) */ |
| 148 | length = pos; |
| 149 | pos += 2; |
| 150 | /* opaque fragment[TLSPlaintext.length] */ |
| 151 | |
| 152 | /* Alert */ |
| 153 | /* AlertLevel level */ |
| 154 | *pos++ = level; |
| 155 | /* AlertDescription description */ |
| 156 | *pos++ = description; |
| 157 | |
| 158 | WPA_PUT_BE16(length, pos - length - 2); |
| 159 | *out_len = pos - alert; |
| 160 | |
| 161 | return alert; |
| 162 | } |
| 163 | |
| 164 | |
| 165 | static u8 * tls_send_client_hello(struct tlsv1_client *conn, |
| 166 | size_t *out_len) |
| 167 | { |
| 168 | u8 *hello, *end, *pos, *hs_length, *hs_start, *rhdr; |
| 169 | struct os_time now; |
| 170 | size_t len, i; |
| 171 | |
| 172 | wpa_printf(MSG_DEBUG, "TLSv1: Send ClientHello"); |
| 173 | *out_len = 0; |
| 174 | |
| 175 | os_get_time(&now); |
| 176 | WPA_PUT_BE32(conn->client_random, now.sec); |
| 177 | if (os_get_random(conn->client_random + 4, TLS_RANDOM_LEN - 4)) { |
| 178 | wpa_printf(MSG_ERROR, "TLSv1: Could not generate " |
| 179 | "client_random"); |
| 180 | return NULL; |
| 181 | } |
| 182 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: client_random", |
| 183 | conn->client_random, TLS_RANDOM_LEN); |
| 184 | |
| 185 | len = 100 + conn->num_cipher_suites * 2 + conn->client_hello_ext_len; |
| 186 | hello = os_malloc(len); |
| 187 | if (hello == NULL) |
| 188 | return NULL; |
| 189 | end = hello + len; |
| 190 | |
| 191 | rhdr = hello; |
| 192 | pos = rhdr + TLS_RECORD_HEADER_LEN; |
| 193 | |
| 194 | /* opaque fragment[TLSPlaintext.length] */ |
| 195 | |
| 196 | /* Handshake */ |
| 197 | hs_start = pos; |
| 198 | /* HandshakeType msg_type */ |
| 199 | *pos++ = TLS_HANDSHAKE_TYPE_CLIENT_HELLO; |
| 200 | /* uint24 length (to be filled) */ |
| 201 | hs_length = pos; |
| 202 | pos += 3; |
| 203 | /* body - ClientHello */ |
| 204 | /* ProtocolVersion client_version */ |
| 205 | WPA_PUT_BE16(pos, TLS_VERSION); |
| 206 | pos += 2; |
| 207 | /* Random random: uint32 gmt_unix_time, opaque random_bytes */ |
| 208 | os_memcpy(pos, conn->client_random, TLS_RANDOM_LEN); |
| 209 | pos += TLS_RANDOM_LEN; |
| 210 | /* SessionID session_id */ |
| 211 | *pos++ = conn->session_id_len; |
| 212 | os_memcpy(pos, conn->session_id, conn->session_id_len); |
| 213 | pos += conn->session_id_len; |
| 214 | /* CipherSuite cipher_suites<2..2^16-1> */ |
| 215 | WPA_PUT_BE16(pos, 2 * conn->num_cipher_suites); |
| 216 | pos += 2; |
| 217 | for (i = 0; i < conn->num_cipher_suites; i++) { |
| 218 | WPA_PUT_BE16(pos, conn->cipher_suites[i]); |
| 219 | pos += 2; |
| 220 | } |
| 221 | /* CompressionMethod compression_methods<1..2^8-1> */ |
| 222 | *pos++ = 1; |
| 223 | *pos++ = TLS_COMPRESSION_NULL; |
| 224 | |
| 225 | if (conn->client_hello_ext) { |
| 226 | os_memcpy(pos, conn->client_hello_ext, |
| 227 | conn->client_hello_ext_len); |
| 228 | pos += conn->client_hello_ext_len; |
| 229 | } |
| 230 | |
| 231 | WPA_PUT_BE24(hs_length, pos - hs_length - 3); |
| 232 | tls_verify_hash_add(conn, hs_start, pos - hs_start); |
| 233 | |
| 234 | if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE, |
| 235 | rhdr, end - rhdr, pos - hs_start, out_len) < 0) { |
| 236 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to create TLS record"); |
| 237 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 238 | TLS_ALERT_INTERNAL_ERROR); |
| 239 | os_free(hello); |
| 240 | return NULL; |
| 241 | } |
| 242 | |
| 243 | conn->state = SERVER_HELLO; |
| 244 | |
| 245 | return hello; |
| 246 | } |
| 247 | |
| 248 | |
| 249 | static int tls_process_server_hello(struct tlsv1_client *conn, u8 ct, |
| 250 | const u8 *in_data, size_t *in_len) |
| 251 | { |
| 252 | const u8 *pos, *end; |
| 253 | size_t left, len, i; |
| 254 | u16 cipher_suite; |
| 255 | |
| 256 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 257 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 258 | "received content type 0x%x", ct); |
| 259 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 260 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 261 | return -1; |
| 262 | } |
| 263 | |
| 264 | pos = in_data; |
| 265 | left = *in_len; |
| 266 | |
| 267 | if (left < 4) |
| 268 | goto decode_error; |
| 269 | |
| 270 | /* HandshakeType msg_type */ |
| 271 | if (*pos != TLS_HANDSHAKE_TYPE_SERVER_HELLO) { |
| 272 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 273 | "message %d (expected ServerHello)", *pos); |
| 274 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 275 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 276 | return -1; |
| 277 | } |
| 278 | wpa_printf(MSG_DEBUG, "TLSv1: Received ServerHello"); |
| 279 | pos++; |
| 280 | /* uint24 length */ |
| 281 | len = WPA_GET_BE24(pos); |
| 282 | pos += 3; |
| 283 | left -= 4; |
| 284 | |
| 285 | if (len > left) |
| 286 | goto decode_error; |
| 287 | |
| 288 | /* body - ServerHello */ |
| 289 | |
| 290 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: ServerHello", pos, len); |
| 291 | end = pos + len; |
| 292 | |
| 293 | /* ProtocolVersion server_version */ |
| 294 | if (end - pos < 2) |
| 295 | goto decode_error; |
| 296 | if (WPA_GET_BE16(pos) != TLS_VERSION) { |
| 297 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected protocol version in " |
| 298 | "ServerHello"); |
| 299 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 300 | TLS_ALERT_PROTOCOL_VERSION); |
| 301 | return -1; |
| 302 | } |
| 303 | pos += 2; |
| 304 | |
| 305 | /* Random random */ |
| 306 | if (end - pos < TLS_RANDOM_LEN) |
| 307 | goto decode_error; |
| 308 | |
| 309 | os_memcpy(conn->server_random, pos, TLS_RANDOM_LEN); |
| 310 | pos += TLS_RANDOM_LEN; |
| 311 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: server_random", |
| 312 | conn->server_random, TLS_RANDOM_LEN); |
| 313 | |
| 314 | /* SessionID session_id */ |
| 315 | if (end - pos < 1) |
| 316 | goto decode_error; |
| 317 | if (end - pos < 1 + *pos || *pos > TLS_SESSION_ID_MAX_LEN) |
| 318 | goto decode_error; |
| 319 | if (conn->session_id_len && conn->session_id_len == *pos && |
| 320 | os_memcmp(conn->session_id, pos + 1, conn->session_id_len) == 0) { |
| 321 | pos += 1 + conn->session_id_len; |
| 322 | wpa_printf(MSG_DEBUG, "TLSv1: Resuming old session"); |
| 323 | conn->session_resumed = 1; |
| 324 | } else { |
| 325 | conn->session_id_len = *pos; |
| 326 | pos++; |
| 327 | os_memcpy(conn->session_id, pos, conn->session_id_len); |
| 328 | pos += conn->session_id_len; |
| 329 | } |
| 330 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: session_id", |
| 331 | conn->session_id, conn->session_id_len); |
| 332 | |
| 333 | /* CipherSuite cipher_suite */ |
| 334 | if (end - pos < 2) |
| 335 | goto decode_error; |
| 336 | cipher_suite = WPA_GET_BE16(pos); |
| 337 | pos += 2; |
| 338 | for (i = 0; i < conn->num_cipher_suites; i++) { |
| 339 | if (cipher_suite == conn->cipher_suites[i]) |
| 340 | break; |
| 341 | } |
| 342 | if (i == conn->num_cipher_suites) { |
| 343 | wpa_printf(MSG_INFO, "TLSv1: Server selected unexpected " |
| 344 | "cipher suite 0x%04x", cipher_suite); |
| 345 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 346 | TLS_ALERT_ILLEGAL_PARAMETER); |
| 347 | return -1; |
| 348 | } |
| 349 | |
| 350 | if (conn->session_resumed && cipher_suite != conn->prev_cipher_suite) { |
| 351 | wpa_printf(MSG_DEBUG, "TLSv1: Server selected a different " |
| 352 | "cipher suite for a resumed connection (0x%04x != " |
| 353 | "0x%04x)", cipher_suite, conn->prev_cipher_suite); |
| 354 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 355 | TLS_ALERT_ILLEGAL_PARAMETER); |
| 356 | return -1; |
| 357 | } |
| 358 | |
| 359 | if (tlsv1_record_set_cipher_suite(&conn->rl, cipher_suite) < 0) { |
| 360 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to set CipherSuite for " |
| 361 | "record layer"); |
| 362 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 363 | TLS_ALERT_INTERNAL_ERROR); |
| 364 | return -1; |
| 365 | } |
| 366 | |
| 367 | conn->prev_cipher_suite = cipher_suite; |
| 368 | |
| 369 | if (conn->session_resumed || conn->ticket_key) |
| 370 | tls_derive_keys(conn, NULL, 0); |
| 371 | |
| 372 | /* CompressionMethod compression_method */ |
| 373 | if (end - pos < 1) |
| 374 | goto decode_error; |
| 375 | if (*pos != TLS_COMPRESSION_NULL) { |
| 376 | wpa_printf(MSG_INFO, "TLSv1: Server selected unexpected " |
| 377 | "compression 0x%02x", *pos); |
| 378 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 379 | TLS_ALERT_ILLEGAL_PARAMETER); |
| 380 | return -1; |
| 381 | } |
| 382 | pos++; |
| 383 | |
| 384 | if (end != pos) { |
| 385 | wpa_hexdump(MSG_DEBUG, "TLSv1: Unexpected extra data in the " |
| 386 | "end of ServerHello", pos, end - pos); |
| 387 | goto decode_error; |
| 388 | } |
| 389 | |
| 390 | *in_len = end - in_data; |
| 391 | |
| 392 | conn->state = (conn->session_resumed || conn->ticket) ? |
| 393 | SERVER_CHANGE_CIPHER_SPEC : SERVER_CERTIFICATE; |
| 394 | |
| 395 | return 0; |
| 396 | |
| 397 | decode_error: |
| 398 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to decode ServerHello"); |
| 399 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR); |
| 400 | return -1; |
| 401 | } |
| 402 | |
| 403 | |
| 404 | static int tls_server_key_exchange_allowed(struct tlsv1_client *conn) |
| 405 | { |
| 406 | const struct tls_cipher_suite *suite; |
| 407 | |
| 408 | /* RFC 2246, Section 7.4.3 */ |
| 409 | suite = tls_get_cipher_suite(conn->rl.cipher_suite); |
| 410 | if (suite == NULL) |
| 411 | return 0; |
| 412 | |
| 413 | switch (suite->key_exchange) { |
| 414 | case TLS_KEY_X_DHE_DSS: |
| 415 | case TLS_KEY_X_DHE_DSS_EXPORT: |
| 416 | case TLS_KEY_X_DHE_RSA: |
| 417 | case TLS_KEY_X_DHE_RSA_EXPORT: |
| 418 | case TLS_KEY_X_DH_anon_EXPORT: |
| 419 | case TLS_KEY_X_DH_anon: |
| 420 | return 1; |
| 421 | case TLS_KEY_X_RSA_EXPORT: |
| 422 | return 1 /* FIX: public key len > 512 bits */; |
| 423 | default: |
| 424 | return 0; |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | |
| 429 | static int tls_process_certificate(struct tlsv1_client *conn, u8 ct, |
| 430 | const u8 *in_data, size_t *in_len) |
| 431 | { |
| 432 | const u8 *pos, *end; |
| 433 | size_t left, len, list_len, cert_len, idx; |
| 434 | u8 type; |
| 435 | struct x509_certificate *chain = NULL, *last = NULL, *cert; |
| 436 | int reason; |
| 437 | |
| 438 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 439 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 440 | "received content type 0x%x", ct); |
| 441 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 442 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 443 | return -1; |
| 444 | } |
| 445 | |
| 446 | pos = in_data; |
| 447 | left = *in_len; |
| 448 | |
| 449 | if (left < 4) { |
| 450 | wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate message " |
| 451 | "(len=%lu)", (unsigned long) left); |
| 452 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR); |
| 453 | return -1; |
| 454 | } |
| 455 | |
| 456 | type = *pos++; |
| 457 | len = WPA_GET_BE24(pos); |
| 458 | pos += 3; |
| 459 | left -= 4; |
| 460 | |
| 461 | if (len > left) { |
| 462 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected Certificate message " |
| 463 | "length (len=%lu != left=%lu)", |
| 464 | (unsigned long) len, (unsigned long) left); |
| 465 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR); |
| 466 | return -1; |
| 467 | } |
| 468 | |
| 469 | if (type == TLS_HANDSHAKE_TYPE_SERVER_KEY_EXCHANGE) |
| 470 | return tls_process_server_key_exchange(conn, ct, in_data, |
| 471 | in_len); |
| 472 | if (type == TLS_HANDSHAKE_TYPE_CERTIFICATE_REQUEST) |
| 473 | return tls_process_certificate_request(conn, ct, in_data, |
| 474 | in_len); |
| 475 | if (type == TLS_HANDSHAKE_TYPE_SERVER_HELLO_DONE) |
| 476 | return tls_process_server_hello_done(conn, ct, in_data, |
| 477 | in_len); |
| 478 | if (type != TLS_HANDSHAKE_TYPE_CERTIFICATE) { |
| 479 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 480 | "message %d (expected Certificate/" |
| 481 | "ServerKeyExchange/CertificateRequest/" |
| 482 | "ServerHelloDone)", type); |
| 483 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 484 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 485 | return -1; |
| 486 | } |
| 487 | |
| 488 | wpa_printf(MSG_DEBUG, |
| 489 | "TLSv1: Received Certificate (certificate_list len %lu)", |
| 490 | (unsigned long) len); |
| 491 | |
| 492 | /* |
| 493 | * opaque ASN.1Cert<2^24-1>; |
| 494 | * |
| 495 | * struct { |
| 496 | * ASN.1Cert certificate_list<1..2^24-1>; |
| 497 | * } Certificate; |
| 498 | */ |
| 499 | |
| 500 | end = pos + len; |
| 501 | |
| 502 | if (end - pos < 3) { |
| 503 | wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate " |
| 504 | "(left=%lu)", (unsigned long) left); |
| 505 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR); |
| 506 | return -1; |
| 507 | } |
| 508 | |
| 509 | list_len = WPA_GET_BE24(pos); |
| 510 | pos += 3; |
| 511 | |
| 512 | if ((size_t) (end - pos) != list_len) { |
| 513 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate_list " |
| 514 | "length (len=%lu left=%lu)", |
| 515 | (unsigned long) list_len, |
| 516 | (unsigned long) (end - pos)); |
| 517 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR); |
| 518 | return -1; |
| 519 | } |
| 520 | |
| 521 | idx = 0; |
| 522 | while (pos < end) { |
| 523 | if (end - pos < 3) { |
| 524 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse " |
| 525 | "certificate_list"); |
| 526 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 527 | TLS_ALERT_DECODE_ERROR); |
| 528 | x509_certificate_chain_free(chain); |
| 529 | return -1; |
| 530 | } |
| 531 | |
| 532 | cert_len = WPA_GET_BE24(pos); |
| 533 | pos += 3; |
| 534 | |
| 535 | if ((size_t) (end - pos) < cert_len) { |
| 536 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate " |
| 537 | "length (len=%lu left=%lu)", |
| 538 | (unsigned long) cert_len, |
| 539 | (unsigned long) (end - pos)); |
| 540 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 541 | TLS_ALERT_DECODE_ERROR); |
| 542 | x509_certificate_chain_free(chain); |
| 543 | return -1; |
| 544 | } |
| 545 | |
| 546 | wpa_printf(MSG_DEBUG, "TLSv1: Certificate %lu (len %lu)", |
| 547 | (unsigned long) idx, (unsigned long) cert_len); |
| 548 | |
| 549 | if (idx == 0) { |
| 550 | crypto_public_key_free(conn->server_rsa_key); |
| 551 | if (tls_parse_cert(pos, cert_len, |
| 552 | &conn->server_rsa_key)) { |
| 553 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse " |
| 554 | "the certificate"); |
| 555 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 556 | TLS_ALERT_BAD_CERTIFICATE); |
| 557 | x509_certificate_chain_free(chain); |
| 558 | return -1; |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | cert = x509_certificate_parse(pos, cert_len); |
| 563 | if (cert == NULL) { |
| 564 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse " |
| 565 | "the certificate"); |
| 566 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 567 | TLS_ALERT_BAD_CERTIFICATE); |
| 568 | x509_certificate_chain_free(chain); |
| 569 | return -1; |
| 570 | } |
| 571 | |
| 572 | if (last == NULL) |
| 573 | chain = cert; |
| 574 | else |
| 575 | last->next = cert; |
| 576 | last = cert; |
| 577 | |
| 578 | idx++; |
| 579 | pos += cert_len; |
| 580 | } |
| 581 | |
| 582 | if (x509_certificate_chain_validate(conn->trusted_certs, chain, |
| 583 | &reason) < 0) { |
| 584 | int tls_reason; |
| 585 | wpa_printf(MSG_DEBUG, "TLSv1: Server certificate chain " |
| 586 | "validation failed (reason=%d)", reason); |
| 587 | switch (reason) { |
| 588 | case X509_VALIDATE_BAD_CERTIFICATE: |
| 589 | tls_reason = TLS_ALERT_BAD_CERTIFICATE; |
| 590 | break; |
| 591 | case X509_VALIDATE_UNSUPPORTED_CERTIFICATE: |
| 592 | tls_reason = TLS_ALERT_UNSUPPORTED_CERTIFICATE; |
| 593 | break; |
| 594 | case X509_VALIDATE_CERTIFICATE_REVOKED: |
| 595 | tls_reason = TLS_ALERT_CERTIFICATE_REVOKED; |
| 596 | break; |
| 597 | case X509_VALIDATE_CERTIFICATE_EXPIRED: |
| 598 | tls_reason = TLS_ALERT_CERTIFICATE_EXPIRED; |
| 599 | break; |
| 600 | case X509_VALIDATE_CERTIFICATE_UNKNOWN: |
| 601 | tls_reason = TLS_ALERT_CERTIFICATE_UNKNOWN; |
| 602 | break; |
| 603 | case X509_VALIDATE_UNKNOWN_CA: |
| 604 | tls_reason = TLS_ALERT_UNKNOWN_CA; |
| 605 | break; |
| 606 | default: |
| 607 | tls_reason = TLS_ALERT_BAD_CERTIFICATE; |
| 608 | break; |
| 609 | } |
| 610 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, tls_reason); |
| 611 | x509_certificate_chain_free(chain); |
| 612 | return -1; |
| 613 | } |
| 614 | |
| 615 | x509_certificate_chain_free(chain); |
| 616 | |
| 617 | *in_len = end - in_data; |
| 618 | |
| 619 | conn->state = SERVER_KEY_EXCHANGE; |
| 620 | |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | |
| 625 | static void tlsv1_client_free_dh(struct tlsv1_client *conn) |
| 626 | { |
| 627 | os_free(conn->dh_p); |
| 628 | os_free(conn->dh_g); |
| 629 | os_free(conn->dh_ys); |
| 630 | conn->dh_p = conn->dh_g = conn->dh_ys = NULL; |
| 631 | } |
| 632 | |
| 633 | |
| 634 | static int tlsv1_process_diffie_hellman(struct tlsv1_client *conn, |
| 635 | const u8 *buf, size_t len) |
| 636 | { |
| 637 | const u8 *pos, *end; |
| 638 | |
| 639 | tlsv1_client_free_dh(conn); |
| 640 | |
| 641 | pos = buf; |
| 642 | end = buf + len; |
| 643 | |
| 644 | if (end - pos < 3) |
| 645 | goto fail; |
| 646 | conn->dh_p_len = WPA_GET_BE16(pos); |
| 647 | pos += 2; |
| 648 | if (conn->dh_p_len == 0 || end - pos < (int) conn->dh_p_len) |
| 649 | goto fail; |
| 650 | conn->dh_p = os_malloc(conn->dh_p_len); |
| 651 | if (conn->dh_p == NULL) |
| 652 | goto fail; |
| 653 | os_memcpy(conn->dh_p, pos, conn->dh_p_len); |
| 654 | pos += conn->dh_p_len; |
| 655 | wpa_hexdump(MSG_DEBUG, "TLSv1: DH p (prime)", |
| 656 | conn->dh_p, conn->dh_p_len); |
| 657 | |
| 658 | if (end - pos < 3) |
| 659 | goto fail; |
| 660 | conn->dh_g_len = WPA_GET_BE16(pos); |
| 661 | pos += 2; |
| 662 | if (conn->dh_g_len == 0 || end - pos < (int) conn->dh_g_len) |
| 663 | goto fail; |
| 664 | conn->dh_g = os_malloc(conn->dh_g_len); |
| 665 | if (conn->dh_g == NULL) |
| 666 | goto fail; |
| 667 | os_memcpy(conn->dh_g, pos, conn->dh_g_len); |
| 668 | pos += conn->dh_g_len; |
| 669 | wpa_hexdump(MSG_DEBUG, "TLSv1: DH g (generator)", |
| 670 | conn->dh_g, conn->dh_g_len); |
| 671 | if (conn->dh_g_len == 1 && conn->dh_g[0] < 2) |
| 672 | goto fail; |
| 673 | |
| 674 | if (end - pos < 3) |
| 675 | goto fail; |
| 676 | conn->dh_ys_len = WPA_GET_BE16(pos); |
| 677 | pos += 2; |
| 678 | if (conn->dh_ys_len == 0 || end - pos < (int) conn->dh_ys_len) |
| 679 | goto fail; |
| 680 | conn->dh_ys = os_malloc(conn->dh_ys_len); |
| 681 | if (conn->dh_ys == NULL) |
| 682 | goto fail; |
| 683 | os_memcpy(conn->dh_ys, pos, conn->dh_ys_len); |
| 684 | pos += conn->dh_ys_len; |
| 685 | wpa_hexdump(MSG_DEBUG, "TLSv1: DH Ys (server's public value)", |
| 686 | conn->dh_ys, conn->dh_ys_len); |
| 687 | |
| 688 | return 0; |
| 689 | |
| 690 | fail: |
| 691 | tlsv1_client_free_dh(conn); |
| 692 | return -1; |
| 693 | } |
| 694 | |
| 695 | |
| 696 | static int tls_process_server_key_exchange(struct tlsv1_client *conn, u8 ct, |
| 697 | const u8 *in_data, size_t *in_len) |
| 698 | { |
| 699 | const u8 *pos, *end; |
| 700 | size_t left, len; |
| 701 | u8 type; |
| 702 | const struct tls_cipher_suite *suite; |
| 703 | |
| 704 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 705 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 706 | "received content type 0x%x", ct); |
| 707 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 708 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 709 | return -1; |
| 710 | } |
| 711 | |
| 712 | pos = in_data; |
| 713 | left = *in_len; |
| 714 | |
| 715 | if (left < 4) { |
| 716 | wpa_printf(MSG_DEBUG, "TLSv1: Too short ServerKeyExchange " |
| 717 | "(Left=%lu)", (unsigned long) left); |
| 718 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, 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 ServerKeyExchange " |
| 729 | "length (len=%lu != left=%lu)", |
| 730 | (unsigned long) len, (unsigned long) left); |
| 731 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR); |
| 732 | return -1; |
| 733 | } |
| 734 | |
| 735 | end = pos + len; |
| 736 | |
| 737 | if (type == TLS_HANDSHAKE_TYPE_CERTIFICATE_REQUEST) |
| 738 | return tls_process_certificate_request(conn, ct, in_data, |
| 739 | in_len); |
| 740 | if (type == TLS_HANDSHAKE_TYPE_SERVER_HELLO_DONE) |
| 741 | return tls_process_server_hello_done(conn, ct, in_data, |
| 742 | in_len); |
| 743 | if (type != TLS_HANDSHAKE_TYPE_SERVER_KEY_EXCHANGE) { |
| 744 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 745 | "message %d (expected ServerKeyExchange/" |
| 746 | "CertificateRequest/ServerHelloDone)", type); |
| 747 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 748 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 749 | return -1; |
| 750 | } |
| 751 | |
| 752 | wpa_printf(MSG_DEBUG, "TLSv1: Received ServerKeyExchange"); |
| 753 | |
| 754 | if (!tls_server_key_exchange_allowed(conn)) { |
| 755 | wpa_printf(MSG_DEBUG, "TLSv1: ServerKeyExchange not allowed " |
| 756 | "with the selected cipher suite"); |
| 757 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 758 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 759 | return -1; |
| 760 | } |
| 761 | |
| 762 | wpa_hexdump(MSG_DEBUG, "TLSv1: ServerKeyExchange", pos, len); |
| 763 | suite = tls_get_cipher_suite(conn->rl.cipher_suite); |
| 764 | if (suite && suite->key_exchange == TLS_KEY_X_DH_anon) { |
| 765 | if (tlsv1_process_diffie_hellman(conn, pos, len) < 0) { |
| 766 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 767 | TLS_ALERT_DECODE_ERROR); |
| 768 | return -1; |
| 769 | } |
| 770 | } else { |
| 771 | wpa_printf(MSG_DEBUG, "TLSv1: UnexpectedServerKeyExchange"); |
| 772 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 773 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 774 | return -1; |
| 775 | } |
| 776 | |
| 777 | *in_len = end - in_data; |
| 778 | |
| 779 | conn->state = SERVER_CERTIFICATE_REQUEST; |
| 780 | |
| 781 | return 0; |
| 782 | } |
| 783 | |
| 784 | |
| 785 | static int tls_process_certificate_request(struct tlsv1_client *conn, u8 ct, |
| 786 | const u8 *in_data, size_t *in_len) |
| 787 | { |
| 788 | const u8 *pos, *end; |
| 789 | size_t left, len; |
| 790 | u8 type; |
| 791 | |
| 792 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 793 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 794 | "received content type 0x%x", ct); |
| 795 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 796 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 797 | return -1; |
| 798 | } |
| 799 | |
| 800 | pos = in_data; |
| 801 | left = *in_len; |
| 802 | |
| 803 | if (left < 4) { |
| 804 | wpa_printf(MSG_DEBUG, "TLSv1: Too short CertificateRequest " |
| 805 | "(left=%lu)", (unsigned long) left); |
| 806 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR); |
| 807 | return -1; |
| 808 | } |
| 809 | |
| 810 | type = *pos++; |
| 811 | len = WPA_GET_BE24(pos); |
| 812 | pos += 3; |
| 813 | left -= 4; |
| 814 | |
| 815 | if (len > left) { |
| 816 | wpa_printf(MSG_DEBUG, "TLSv1: Mismatch in CertificateRequest " |
| 817 | "length (len=%lu != left=%lu)", |
| 818 | (unsigned long) len, (unsigned long) left); |
| 819 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR); |
| 820 | return -1; |
| 821 | } |
| 822 | |
| 823 | end = pos + len; |
| 824 | |
| 825 | if (type == TLS_HANDSHAKE_TYPE_SERVER_HELLO_DONE) |
| 826 | return tls_process_server_hello_done(conn, ct, in_data, |
| 827 | in_len); |
| 828 | if (type != TLS_HANDSHAKE_TYPE_CERTIFICATE_REQUEST) { |
| 829 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 830 | "message %d (expected CertificateRequest/" |
| 831 | "ServerHelloDone)", type); |
| 832 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 833 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 834 | return -1; |
| 835 | } |
| 836 | |
| 837 | wpa_printf(MSG_DEBUG, "TLSv1: Received CertificateRequest"); |
| 838 | |
| 839 | conn->certificate_requested = 1; |
| 840 | |
| 841 | *in_len = end - in_data; |
| 842 | |
| 843 | conn->state = SERVER_HELLO_DONE; |
| 844 | |
| 845 | return 0; |
| 846 | } |
| 847 | |
| 848 | |
| 849 | static int tls_process_server_hello_done(struct tlsv1_client *conn, u8 ct, |
| 850 | const u8 *in_data, size_t *in_len) |
| 851 | { |
| 852 | const u8 *pos, *end; |
| 853 | size_t left, len; |
| 854 | u8 type; |
| 855 | |
| 856 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 857 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; " |
| 858 | "received content type 0x%x", ct); |
| 859 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 860 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 861 | return -1; |
| 862 | } |
| 863 | |
| 864 | pos = in_data; |
| 865 | left = *in_len; |
| 866 | |
| 867 | if (left < 4) { |
| 868 | wpa_printf(MSG_DEBUG, "TLSv1: Too short ServerHelloDone " |
| 869 | "(left=%lu)", (unsigned long) left); |
| 870 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR); |
| 871 | return -1; |
| 872 | } |
| 873 | |
| 874 | type = *pos++; |
| 875 | len = WPA_GET_BE24(pos); |
| 876 | pos += 3; |
| 877 | left -= 4; |
| 878 | |
| 879 | if (len > left) { |
| 880 | wpa_printf(MSG_DEBUG, "TLSv1: Mismatch in ServerHelloDone " |
| 881 | "length (len=%lu != left=%lu)", |
| 882 | (unsigned long) len, (unsigned long) left); |
| 883 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR); |
| 884 | return -1; |
| 885 | } |
| 886 | end = pos + len; |
| 887 | |
| 888 | if (type != TLS_HANDSHAKE_TYPE_SERVER_HELLO_DONE) { |
| 889 | wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake " |
| 890 | "message %d (expected ServerHelloDone)", type); |
| 891 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 892 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 893 | return -1; |
| 894 | } |
| 895 | |
| 896 | wpa_printf(MSG_DEBUG, "TLSv1: Received ServerHelloDone"); |
| 897 | |
| 898 | *in_len = end - in_data; |
| 899 | |
| 900 | conn->state = CLIENT_KEY_EXCHANGE; |
| 901 | |
| 902 | return 0; |
| 903 | } |
| 904 | |
| 905 | |
| 906 | static int tls_process_server_change_cipher_spec(struct tlsv1_client *conn, |
| 907 | u8 ct, const u8 *in_data, |
| 908 | size_t *in_len) |
| 909 | { |
| 910 | const u8 *pos; |
| 911 | size_t left; |
| 912 | |
| 913 | if (ct != TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC) { |
| 914 | wpa_printf(MSG_DEBUG, "TLSv1: Expected ChangeCipherSpec; " |
| 915 | "received content type 0x%x", ct); |
| 916 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 917 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 918 | return -1; |
| 919 | } |
| 920 | |
| 921 | pos = in_data; |
| 922 | left = *in_len; |
| 923 | |
| 924 | if (left < 1) { |
| 925 | wpa_printf(MSG_DEBUG, "TLSv1: Too short ChangeCipherSpec"); |
| 926 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR); |
| 927 | return -1; |
| 928 | } |
| 929 | |
| 930 | if (*pos != TLS_CHANGE_CIPHER_SPEC) { |
| 931 | wpa_printf(MSG_DEBUG, "TLSv1: Expected ChangeCipherSpec; " |
| 932 | "received data 0x%x", *pos); |
| 933 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 934 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 935 | return -1; |
| 936 | } |
| 937 | |
| 938 | wpa_printf(MSG_DEBUG, "TLSv1: Received ChangeCipherSpec"); |
| 939 | if (tlsv1_record_change_read_cipher(&conn->rl) < 0) { |
| 940 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to change read cipher " |
| 941 | "for record layer"); |
| 942 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 943 | TLS_ALERT_INTERNAL_ERROR); |
| 944 | return -1; |
| 945 | } |
| 946 | |
| 947 | *in_len = pos + 1 - in_data; |
| 948 | |
| 949 | conn->state = SERVER_FINISHED; |
| 950 | |
| 951 | return 0; |
| 952 | } |
| 953 | |
| 954 | |
| 955 | static int tls_process_server_finished(struct tlsv1_client *conn, u8 ct, |
| 956 | const u8 *in_data, size_t *in_len) |
| 957 | { |
| 958 | const u8 *pos, *end; |
| 959 | size_t left, len, hlen; |
| 960 | u8 verify_data[TLS_VERIFY_DATA_LEN]; |
| 961 | u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN]; |
| 962 | |
| 963 | if (ct != TLS_CONTENT_TYPE_HANDSHAKE) { |
| 964 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Finished; " |
| 965 | "received content type 0x%x", ct); |
| 966 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 967 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 968 | return -1; |
| 969 | } |
| 970 | |
| 971 | pos = in_data; |
| 972 | left = *in_len; |
| 973 | |
| 974 | if (left < 4) { |
| 975 | wpa_printf(MSG_DEBUG, "TLSv1: Too short record (left=%lu) for " |
| 976 | "Finished", |
| 977 | (unsigned long) left); |
| 978 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 979 | TLS_ALERT_DECODE_ERROR); |
| 980 | return -1; |
| 981 | } |
| 982 | |
| 983 | if (pos[0] != TLS_HANDSHAKE_TYPE_FINISHED) { |
| 984 | wpa_printf(MSG_DEBUG, "TLSv1: Expected Finished; received " |
| 985 | "type 0x%x", pos[0]); |
| 986 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 987 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 988 | return -1; |
| 989 | } |
| 990 | |
| 991 | len = WPA_GET_BE24(pos + 1); |
| 992 | |
| 993 | pos += 4; |
| 994 | left -= 4; |
| 995 | |
| 996 | if (len > left) { |
| 997 | wpa_printf(MSG_DEBUG, "TLSv1: Too short buffer for Finished " |
| 998 | "(len=%lu > left=%lu)", |
| 999 | (unsigned long) len, (unsigned long) left); |
| 1000 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1001 | TLS_ALERT_DECODE_ERROR); |
| 1002 | return -1; |
| 1003 | } |
| 1004 | end = pos + len; |
| 1005 | if (len != TLS_VERIFY_DATA_LEN) { |
| 1006 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected verify_data length " |
| 1007 | "in Finished: %lu (expected %d)", |
| 1008 | (unsigned long) len, TLS_VERIFY_DATA_LEN); |
| 1009 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1010 | TLS_ALERT_DECODE_ERROR); |
| 1011 | return -1; |
| 1012 | } |
| 1013 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: verify_data in Finished", |
| 1014 | pos, TLS_VERIFY_DATA_LEN); |
| 1015 | |
| 1016 | hlen = MD5_MAC_LEN; |
| 1017 | if (conn->verify_md5_server == NULL || |
| 1018 | crypto_hash_finish(conn->verify_md5_server, hash, &hlen) < 0) { |
| 1019 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1020 | TLS_ALERT_INTERNAL_ERROR); |
| 1021 | conn->verify_md5_server = NULL; |
| 1022 | crypto_hash_finish(conn->verify_sha1_server, NULL, NULL); |
| 1023 | conn->verify_sha1_server = NULL; |
| 1024 | return -1; |
| 1025 | } |
| 1026 | conn->verify_md5_server = NULL; |
| 1027 | hlen = SHA1_MAC_LEN; |
| 1028 | if (conn->verify_sha1_server == NULL || |
| 1029 | crypto_hash_finish(conn->verify_sha1_server, hash + MD5_MAC_LEN, |
| 1030 | &hlen) < 0) { |
| 1031 | conn->verify_sha1_server = NULL; |
| 1032 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1033 | TLS_ALERT_INTERNAL_ERROR); |
| 1034 | return -1; |
| 1035 | } |
| 1036 | conn->verify_sha1_server = NULL; |
| 1037 | |
| 1038 | if (tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN, |
| 1039 | "server finished", hash, MD5_MAC_LEN + SHA1_MAC_LEN, |
| 1040 | verify_data, TLS_VERIFY_DATA_LEN)) { |
| 1041 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive verify_data"); |
| 1042 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1043 | TLS_ALERT_DECRYPT_ERROR); |
| 1044 | return -1; |
| 1045 | } |
| 1046 | wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (server)", |
| 1047 | verify_data, TLS_VERIFY_DATA_LEN); |
| 1048 | |
| 1049 | if (os_memcmp(pos, verify_data, TLS_VERIFY_DATA_LEN) != 0) { |
| 1050 | wpa_printf(MSG_INFO, "TLSv1: Mismatch in verify_data"); |
| 1051 | return -1; |
| 1052 | } |
| 1053 | |
| 1054 | wpa_printf(MSG_DEBUG, "TLSv1: Received Finished"); |
| 1055 | |
| 1056 | *in_len = end - in_data; |
| 1057 | |
| 1058 | conn->state = (conn->session_resumed || conn->ticket) ? |
| 1059 | CHANGE_CIPHER_SPEC : ACK_FINISHED; |
| 1060 | |
| 1061 | return 0; |
| 1062 | } |
| 1063 | |
| 1064 | |
| 1065 | static int tls_derive_pre_master_secret(u8 *pre_master_secret) |
| 1066 | { |
| 1067 | WPA_PUT_BE16(pre_master_secret, TLS_VERSION); |
| 1068 | if (os_get_random(pre_master_secret + 2, |
| 1069 | TLS_PRE_MASTER_SECRET_LEN - 2)) |
| 1070 | return -1; |
| 1071 | return 0; |
| 1072 | } |
| 1073 | |
| 1074 | |
| 1075 | static int tls_derive_keys(struct tlsv1_client *conn, |
| 1076 | const u8 *pre_master_secret, |
| 1077 | size_t pre_master_secret_len) |
| 1078 | { |
| 1079 | u8 seed[2 * TLS_RANDOM_LEN]; |
| 1080 | u8 key_block[TLS_MAX_KEY_BLOCK_LEN]; |
| 1081 | u8 *pos; |
| 1082 | size_t key_block_len; |
| 1083 | |
| 1084 | if (pre_master_secret) { |
| 1085 | wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: pre_master_secret", |
| 1086 | pre_master_secret, pre_master_secret_len); |
| 1087 | os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN); |
| 1088 | os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random, |
| 1089 | TLS_RANDOM_LEN); |
| 1090 | if (tls_prf(pre_master_secret, pre_master_secret_len, |
| 1091 | "master secret", seed, 2 * TLS_RANDOM_LEN, |
| 1092 | conn->master_secret, TLS_MASTER_SECRET_LEN)) { |
| 1093 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive " |
| 1094 | "master_secret"); |
| 1095 | return -1; |
| 1096 | } |
| 1097 | wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret", |
| 1098 | conn->master_secret, TLS_MASTER_SECRET_LEN); |
| 1099 | } |
| 1100 | |
| 1101 | os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN); |
| 1102 | os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN); |
| 1103 | key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len + |
| 1104 | conn->rl.iv_size); |
| 1105 | if (tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN, |
| 1106 | "key expansion", seed, 2 * TLS_RANDOM_LEN, |
| 1107 | key_block, key_block_len)) { |
| 1108 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive key_block"); |
| 1109 | return -1; |
| 1110 | } |
| 1111 | wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: key_block", |
| 1112 | key_block, key_block_len); |
| 1113 | |
| 1114 | pos = key_block; |
| 1115 | |
| 1116 | /* client_write_MAC_secret */ |
| 1117 | os_memcpy(conn->rl.write_mac_secret, pos, conn->rl.hash_size); |
| 1118 | pos += conn->rl.hash_size; |
| 1119 | /* server_write_MAC_secret */ |
| 1120 | os_memcpy(conn->rl.read_mac_secret, pos, conn->rl.hash_size); |
| 1121 | pos += conn->rl.hash_size; |
| 1122 | |
| 1123 | /* client_write_key */ |
| 1124 | os_memcpy(conn->rl.write_key, pos, conn->rl.key_material_len); |
| 1125 | pos += conn->rl.key_material_len; |
| 1126 | /* server_write_key */ |
| 1127 | os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len); |
| 1128 | pos += conn->rl.key_material_len; |
| 1129 | |
| 1130 | /* client_write_IV */ |
| 1131 | os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size); |
| 1132 | pos += conn->rl.iv_size; |
| 1133 | /* server_write_IV */ |
| 1134 | os_memcpy(conn->rl.read_iv, pos, conn->rl.iv_size); |
| 1135 | pos += conn->rl.iv_size; |
| 1136 | |
| 1137 | return 0; |
| 1138 | } |
| 1139 | |
| 1140 | |
| 1141 | static int tls_write_client_certificate(struct tlsv1_client *conn, |
| 1142 | u8 **msgpos, u8 *end) |
| 1143 | { |
| 1144 | u8 *pos, *rhdr, *hs_start, *hs_length, *cert_start; |
| 1145 | size_t rlen; |
| 1146 | struct x509_certificate *cert; |
| 1147 | |
| 1148 | pos = *msgpos; |
| 1149 | |
| 1150 | wpa_printf(MSG_DEBUG, "TLSv1: Send Certificate"); |
| 1151 | rhdr = pos; |
| 1152 | pos += TLS_RECORD_HEADER_LEN; |
| 1153 | |
| 1154 | /* opaque fragment[TLSPlaintext.length] */ |
| 1155 | |
| 1156 | /* Handshake */ |
| 1157 | hs_start = pos; |
| 1158 | /* HandshakeType msg_type */ |
| 1159 | *pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE; |
| 1160 | /* uint24 length (to be filled) */ |
| 1161 | hs_length = pos; |
| 1162 | pos += 3; |
| 1163 | /* body - Certificate */ |
| 1164 | /* uint24 length (to be filled) */ |
| 1165 | cert_start = pos; |
| 1166 | pos += 3; |
| 1167 | cert = conn->client_cert; |
| 1168 | while (cert) { |
| 1169 | if (pos + 3 + cert->cert_len > end) { |
| 1170 | wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space " |
| 1171 | "for Certificate (cert_len=%lu left=%lu)", |
| 1172 | (unsigned long) cert->cert_len, |
| 1173 | (unsigned long) (end - pos)); |
| 1174 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1175 | TLS_ALERT_INTERNAL_ERROR); |
| 1176 | return -1; |
| 1177 | } |
| 1178 | WPA_PUT_BE24(pos, cert->cert_len); |
| 1179 | pos += 3; |
| 1180 | os_memcpy(pos, cert->cert_start, cert->cert_len); |
| 1181 | pos += cert->cert_len; |
| 1182 | |
| 1183 | if (x509_certificate_self_signed(cert)) |
| 1184 | break; |
| 1185 | cert = x509_certificate_get_subject(conn->trusted_certs, |
| 1186 | &cert->issuer); |
| 1187 | } |
| 1188 | if (cert == conn->client_cert || cert == NULL) { |
| 1189 | /* |
| 1190 | * Client was not configured with all the needed certificates |
| 1191 | * to form a full certificate chain. The server may fail to |
| 1192 | * validate the chain unless it is configured with all the |
| 1193 | * missing CA certificates. |
| 1194 | */ |
| 1195 | wpa_printf(MSG_DEBUG, "TLSv1: Full client certificate chain " |
| 1196 | "not configured - validation may fail"); |
| 1197 | } |
| 1198 | WPA_PUT_BE24(cert_start, pos - cert_start - 3); |
| 1199 | |
| 1200 | WPA_PUT_BE24(hs_length, pos - hs_length - 3); |
| 1201 | |
| 1202 | if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE, |
| 1203 | rhdr, end - rhdr, pos - hs_start, &rlen) < 0) { |
| 1204 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record"); |
| 1205 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1206 | TLS_ALERT_INTERNAL_ERROR); |
| 1207 | return -1; |
| 1208 | } |
| 1209 | pos = rhdr + rlen; |
| 1210 | |
| 1211 | tls_verify_hash_add(conn, hs_start, pos - hs_start); |
| 1212 | |
| 1213 | *msgpos = pos; |
| 1214 | |
| 1215 | return 0; |
| 1216 | } |
| 1217 | |
| 1218 | |
| 1219 | static int tlsv1_key_x_anon_dh(struct tlsv1_client *conn, u8 **pos, u8 *end) |
| 1220 | { |
| 1221 | #ifdef EAP_FAST |
| 1222 | /* ClientDiffieHellmanPublic */ |
| 1223 | u8 *csecret, *csecret_start, *dh_yc, *shared; |
| 1224 | size_t csecret_len, dh_yc_len, shared_len; |
| 1225 | |
| 1226 | csecret_len = conn->dh_p_len; |
| 1227 | csecret = os_malloc(csecret_len); |
| 1228 | if (csecret == NULL) { |
| 1229 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate " |
| 1230 | "memory for Yc (Diffie-Hellman)"); |
| 1231 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1232 | TLS_ALERT_INTERNAL_ERROR); |
| 1233 | return -1; |
| 1234 | } |
| 1235 | if (os_get_random(csecret, csecret_len)) { |
| 1236 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to get random " |
| 1237 | "data for Diffie-Hellman"); |
| 1238 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1239 | TLS_ALERT_INTERNAL_ERROR); |
| 1240 | os_free(csecret); |
| 1241 | return -1; |
| 1242 | } |
| 1243 | |
| 1244 | if (os_memcmp(csecret, conn->dh_p, csecret_len) > 0) |
| 1245 | csecret[0] = 0; /* make sure Yc < p */ |
| 1246 | |
| 1247 | csecret_start = csecret; |
| 1248 | while (csecret_len > 1 && *csecret_start == 0) { |
| 1249 | csecret_start++; |
| 1250 | csecret_len--; |
| 1251 | } |
| 1252 | wpa_hexdump_key(MSG_DEBUG, "TLSv1: DH client's secret value", |
| 1253 | csecret_start, csecret_len); |
| 1254 | |
| 1255 | /* Yc = g^csecret mod p */ |
| 1256 | dh_yc_len = conn->dh_p_len; |
| 1257 | dh_yc = os_malloc(dh_yc_len); |
| 1258 | if (dh_yc == NULL) { |
| 1259 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate " |
| 1260 | "memory for Diffie-Hellman"); |
| 1261 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1262 | TLS_ALERT_INTERNAL_ERROR); |
| 1263 | os_free(csecret); |
| 1264 | return -1; |
| 1265 | } |
| 1266 | crypto_mod_exp(conn->dh_g, conn->dh_g_len, |
| 1267 | csecret_start, csecret_len, |
| 1268 | conn->dh_p, conn->dh_p_len, |
| 1269 | dh_yc, &dh_yc_len); |
| 1270 | |
| 1271 | wpa_hexdump(MSG_DEBUG, "TLSv1: DH Yc (client's public value)", |
| 1272 | dh_yc, dh_yc_len); |
| 1273 | |
| 1274 | WPA_PUT_BE16(*pos, dh_yc_len); |
| 1275 | *pos += 2; |
| 1276 | if (*pos + dh_yc_len > end) { |
| 1277 | wpa_printf(MSG_DEBUG, "TLSv1: Not enough room in the " |
| 1278 | "message buffer for Yc"); |
| 1279 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1280 | TLS_ALERT_INTERNAL_ERROR); |
| 1281 | os_free(csecret); |
| 1282 | os_free(dh_yc); |
| 1283 | return -1; |
| 1284 | } |
| 1285 | os_memcpy(*pos, dh_yc, dh_yc_len); |
| 1286 | *pos += dh_yc_len; |
| 1287 | os_free(dh_yc); |
| 1288 | |
| 1289 | shared_len = conn->dh_p_len; |
| 1290 | shared = os_malloc(shared_len); |
| 1291 | if (shared == NULL) { |
| 1292 | wpa_printf(MSG_DEBUG, "TLSv1: Could not allocate memory for " |
| 1293 | "DH"); |
| 1294 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1295 | TLS_ALERT_INTERNAL_ERROR); |
| 1296 | os_free(csecret); |
| 1297 | return -1; |
| 1298 | } |
| 1299 | |
| 1300 | /* shared = Ys^csecret mod p */ |
| 1301 | crypto_mod_exp(conn->dh_ys, conn->dh_ys_len, |
| 1302 | csecret_start, csecret_len, |
| 1303 | conn->dh_p, conn->dh_p_len, |
| 1304 | shared, &shared_len); |
| 1305 | wpa_hexdump_key(MSG_DEBUG, "TLSv1: Shared secret from DH key exchange", |
| 1306 | shared, shared_len); |
| 1307 | |
| 1308 | os_memset(csecret_start, 0, csecret_len); |
| 1309 | os_free(csecret); |
| 1310 | if (tls_derive_keys(conn, shared, shared_len)) { |
| 1311 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys"); |
| 1312 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1313 | TLS_ALERT_INTERNAL_ERROR); |
| 1314 | os_free(shared); |
| 1315 | return -1; |
| 1316 | } |
| 1317 | os_memset(shared, 0, shared_len); |
| 1318 | os_free(shared); |
| 1319 | tlsv1_client_free_dh(conn); |
| 1320 | return 0; |
| 1321 | #else /* EAP_FAST */ |
| 1322 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_INTERNAL_ERROR); |
| 1323 | return -1; |
| 1324 | #endif /* EAP_FAST */ |
| 1325 | } |
| 1326 | |
| 1327 | |
| 1328 | static int tlsv1_key_x_rsa(struct tlsv1_client *conn, u8 **pos, u8 *end) |
| 1329 | { |
| 1330 | u8 pre_master_secret[TLS_PRE_MASTER_SECRET_LEN]; |
| 1331 | size_t clen; |
| 1332 | int res; |
| 1333 | |
| 1334 | if (tls_derive_pre_master_secret(pre_master_secret) < 0 || |
| 1335 | tls_derive_keys(conn, pre_master_secret, |
| 1336 | TLS_PRE_MASTER_SECRET_LEN)) { |
| 1337 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys"); |
| 1338 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1339 | TLS_ALERT_INTERNAL_ERROR); |
| 1340 | return -1; |
| 1341 | } |
| 1342 | |
| 1343 | /* EncryptedPreMasterSecret */ |
| 1344 | if (conn->server_rsa_key == NULL) { |
| 1345 | wpa_printf(MSG_DEBUG, "TLSv1: No server RSA key to " |
| 1346 | "use for encrypting pre-master secret"); |
| 1347 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1348 | TLS_ALERT_INTERNAL_ERROR); |
| 1349 | return -1; |
| 1350 | } |
| 1351 | |
| 1352 | /* RSA encrypted value is encoded with PKCS #1 v1.5 block type 2. */ |
| 1353 | *pos += 2; |
| 1354 | clen = end - *pos; |
| 1355 | res = crypto_public_key_encrypt_pkcs1_v15( |
| 1356 | conn->server_rsa_key, |
| 1357 | pre_master_secret, TLS_PRE_MASTER_SECRET_LEN, |
| 1358 | *pos, &clen); |
| 1359 | os_memset(pre_master_secret, 0, TLS_PRE_MASTER_SECRET_LEN); |
| 1360 | if (res < 0) { |
| 1361 | wpa_printf(MSG_DEBUG, "TLSv1: RSA encryption failed"); |
| 1362 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1363 | TLS_ALERT_INTERNAL_ERROR); |
| 1364 | return -1; |
| 1365 | } |
| 1366 | WPA_PUT_BE16(*pos - 2, clen); |
| 1367 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: Encrypted pre_master_secret", |
| 1368 | *pos, clen); |
| 1369 | *pos += clen; |
| 1370 | |
| 1371 | return 0; |
| 1372 | } |
| 1373 | |
| 1374 | |
| 1375 | static int tls_write_client_key_exchange(struct tlsv1_client *conn, |
| 1376 | u8 **msgpos, u8 *end) |
| 1377 | { |
| 1378 | u8 *pos, *rhdr, *hs_start, *hs_length; |
| 1379 | size_t rlen; |
| 1380 | tls_key_exchange keyx; |
| 1381 | const struct tls_cipher_suite *suite; |
| 1382 | |
| 1383 | suite = tls_get_cipher_suite(conn->rl.cipher_suite); |
| 1384 | if (suite == NULL) |
| 1385 | keyx = TLS_KEY_X_NULL; |
| 1386 | else |
| 1387 | keyx = suite->key_exchange; |
| 1388 | |
| 1389 | pos = *msgpos; |
| 1390 | |
| 1391 | wpa_printf(MSG_DEBUG, "TLSv1: Send ClientKeyExchange"); |
| 1392 | |
| 1393 | rhdr = pos; |
| 1394 | pos += TLS_RECORD_HEADER_LEN; |
| 1395 | |
| 1396 | /* opaque fragment[TLSPlaintext.length] */ |
| 1397 | |
| 1398 | /* Handshake */ |
| 1399 | hs_start = pos; |
| 1400 | /* HandshakeType msg_type */ |
| 1401 | *pos++ = TLS_HANDSHAKE_TYPE_CLIENT_KEY_EXCHANGE; |
| 1402 | /* uint24 length (to be filled) */ |
| 1403 | hs_length = pos; |
| 1404 | pos += 3; |
| 1405 | /* body - ClientKeyExchange */ |
| 1406 | if (keyx == TLS_KEY_X_DH_anon) { |
| 1407 | if (tlsv1_key_x_anon_dh(conn, &pos, end) < 0) |
| 1408 | return -1; |
| 1409 | } else { |
| 1410 | if (tlsv1_key_x_rsa(conn, &pos, end) < 0) |
| 1411 | return -1; |
| 1412 | } |
| 1413 | |
| 1414 | WPA_PUT_BE24(hs_length, pos - hs_length - 3); |
| 1415 | |
| 1416 | if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE, |
| 1417 | rhdr, end - rhdr, pos - hs_start, &rlen) < 0) { |
| 1418 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record"); |
| 1419 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1420 | TLS_ALERT_INTERNAL_ERROR); |
| 1421 | return -1; |
| 1422 | } |
| 1423 | pos = rhdr + rlen; |
| 1424 | tls_verify_hash_add(conn, hs_start, pos - hs_start); |
| 1425 | |
| 1426 | *msgpos = pos; |
| 1427 | |
| 1428 | return 0; |
| 1429 | } |
| 1430 | |
| 1431 | |
| 1432 | static int tls_write_client_certificate_verify(struct tlsv1_client *conn, |
| 1433 | u8 **msgpos, u8 *end) |
| 1434 | { |
| 1435 | u8 *pos, *rhdr, *hs_start, *hs_length, *signed_start; |
| 1436 | size_t rlen, hlen, clen; |
| 1437 | u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN], *hpos; |
| 1438 | enum { SIGN_ALG_RSA, SIGN_ALG_DSA } alg = SIGN_ALG_RSA; |
| 1439 | |
| 1440 | pos = *msgpos; |
| 1441 | |
| 1442 | wpa_printf(MSG_DEBUG, "TLSv1: Send CertificateVerify"); |
| 1443 | rhdr = pos; |
| 1444 | pos += TLS_RECORD_HEADER_LEN; |
| 1445 | |
| 1446 | /* Handshake */ |
| 1447 | hs_start = pos; |
| 1448 | /* HandshakeType msg_type */ |
| 1449 | *pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE_VERIFY; |
| 1450 | /* uint24 length (to be filled) */ |
| 1451 | hs_length = pos; |
| 1452 | pos += 3; |
| 1453 | |
| 1454 | /* |
| 1455 | * RFC 2246: 7.4.3 and 7.4.8: |
| 1456 | * Signature signature |
| 1457 | * |
| 1458 | * RSA: |
| 1459 | * digitally-signed struct { |
| 1460 | * opaque md5_hash[16]; |
| 1461 | * opaque sha_hash[20]; |
| 1462 | * }; |
| 1463 | * |
| 1464 | * DSA: |
| 1465 | * digitally-signed struct { |
| 1466 | * opaque sha_hash[20]; |
| 1467 | * }; |
| 1468 | * |
| 1469 | * The hash values are calculated over all handshake messages sent or |
| 1470 | * received starting at ClientHello up to, but not including, this |
| 1471 | * CertificateVerify message, including the type and length fields of |
| 1472 | * the handshake messages. |
| 1473 | */ |
| 1474 | |
| 1475 | hpos = hash; |
| 1476 | |
| 1477 | if (alg == SIGN_ALG_RSA) { |
| 1478 | hlen = MD5_MAC_LEN; |
| 1479 | if (conn->verify_md5_cert == NULL || |
| 1480 | crypto_hash_finish(conn->verify_md5_cert, hpos, &hlen) < 0) |
| 1481 | { |
| 1482 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1483 | TLS_ALERT_INTERNAL_ERROR); |
| 1484 | conn->verify_md5_cert = NULL; |
| 1485 | crypto_hash_finish(conn->verify_sha1_cert, NULL, NULL); |
| 1486 | conn->verify_sha1_cert = NULL; |
| 1487 | return -1; |
| 1488 | } |
| 1489 | hpos += MD5_MAC_LEN; |
| 1490 | } else |
| 1491 | crypto_hash_finish(conn->verify_md5_cert, NULL, NULL); |
| 1492 | |
| 1493 | conn->verify_md5_cert = NULL; |
| 1494 | hlen = SHA1_MAC_LEN; |
| 1495 | if (conn->verify_sha1_cert == NULL || |
| 1496 | crypto_hash_finish(conn->verify_sha1_cert, hpos, &hlen) < 0) { |
| 1497 | conn->verify_sha1_cert = NULL; |
| 1498 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1499 | TLS_ALERT_INTERNAL_ERROR); |
| 1500 | return -1; |
| 1501 | } |
| 1502 | conn->verify_sha1_cert = NULL; |
| 1503 | |
| 1504 | if (alg == SIGN_ALG_RSA) |
| 1505 | hlen += MD5_MAC_LEN; |
| 1506 | |
| 1507 | wpa_hexdump(MSG_MSGDUMP, "TLSv1: CertificateVerify hash", hash, hlen); |
| 1508 | |
| 1509 | /* |
| 1510 | * RFC 2246, 4.7: |
| 1511 | * In digital signing, one-way hash functions are used as input for a |
| 1512 | * signing algorithm. A digitally-signed element is encoded as an |
| 1513 | * opaque vector <0..2^16-1>, where the length is specified by the |
| 1514 | * signing algorithm and key. |
| 1515 | * |
| 1516 | * In RSA signing, a 36-byte structure of two hashes (one SHA and one |
| 1517 | * MD5) is signed (encrypted with the private key). It is encoded with |
| 1518 | * PKCS #1 block type 0 or type 1 as described in [PKCS1]. |
| 1519 | */ |
| 1520 | signed_start = pos; /* length to be filled */ |
| 1521 | pos += 2; |
| 1522 | clen = end - pos; |
| 1523 | if (crypto_private_key_sign_pkcs1(conn->client_key, hash, hlen, |
| 1524 | pos, &clen) < 0) { |
| 1525 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to sign hash (PKCS #1)"); |
| 1526 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1527 | TLS_ALERT_INTERNAL_ERROR); |
| 1528 | return -1; |
| 1529 | } |
| 1530 | WPA_PUT_BE16(signed_start, clen); |
| 1531 | |
| 1532 | pos += clen; |
| 1533 | |
| 1534 | WPA_PUT_BE24(hs_length, pos - hs_length - 3); |
| 1535 | |
| 1536 | if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE, |
| 1537 | rhdr, end - rhdr, pos - hs_start, &rlen) < 0) { |
| 1538 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record"); |
| 1539 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1540 | TLS_ALERT_INTERNAL_ERROR); |
| 1541 | return -1; |
| 1542 | } |
| 1543 | pos = rhdr + rlen; |
| 1544 | |
| 1545 | tls_verify_hash_add(conn, hs_start, pos - hs_start); |
| 1546 | |
| 1547 | *msgpos = pos; |
| 1548 | |
| 1549 | return 0; |
| 1550 | } |
| 1551 | |
| 1552 | |
| 1553 | static int tls_write_client_change_cipher_spec(struct tlsv1_client *conn, |
| 1554 | u8 **msgpos, u8 *end) |
| 1555 | { |
| 1556 | u8 *pos, *rhdr; |
| 1557 | size_t rlen; |
| 1558 | |
| 1559 | pos = *msgpos; |
| 1560 | |
| 1561 | wpa_printf(MSG_DEBUG, "TLSv1: Send ChangeCipherSpec"); |
| 1562 | rhdr = pos; |
| 1563 | pos += TLS_RECORD_HEADER_LEN; |
| 1564 | *pos = TLS_CHANGE_CIPHER_SPEC; |
| 1565 | if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC, |
| 1566 | rhdr, end - rhdr, 1, &rlen) < 0) { |
| 1567 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record"); |
| 1568 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1569 | TLS_ALERT_INTERNAL_ERROR); |
| 1570 | return -1; |
| 1571 | } |
| 1572 | |
| 1573 | if (tlsv1_record_change_write_cipher(&conn->rl) < 0) { |
| 1574 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to set write cipher for " |
| 1575 | "record layer"); |
| 1576 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1577 | TLS_ALERT_INTERNAL_ERROR); |
| 1578 | return -1; |
| 1579 | } |
| 1580 | |
| 1581 | *msgpos = rhdr + rlen; |
| 1582 | |
| 1583 | return 0; |
| 1584 | } |
| 1585 | |
| 1586 | |
| 1587 | static int tls_write_client_finished(struct tlsv1_client *conn, |
| 1588 | u8 **msgpos, u8 *end) |
| 1589 | { |
| 1590 | u8 *pos, *rhdr, *hs_start, *hs_length; |
| 1591 | size_t rlen, hlen; |
| 1592 | u8 verify_data[TLS_VERIFY_DATA_LEN]; |
| 1593 | u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN]; |
| 1594 | |
| 1595 | pos = *msgpos; |
| 1596 | |
| 1597 | wpa_printf(MSG_DEBUG, "TLSv1: Send Finished"); |
| 1598 | |
| 1599 | /* Encrypted Handshake Message: Finished */ |
| 1600 | |
| 1601 | hlen = MD5_MAC_LEN; |
| 1602 | if (conn->verify_md5_client == NULL || |
| 1603 | crypto_hash_finish(conn->verify_md5_client, hash, &hlen) < 0) { |
| 1604 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1605 | TLS_ALERT_INTERNAL_ERROR); |
| 1606 | conn->verify_md5_client = NULL; |
| 1607 | crypto_hash_finish(conn->verify_sha1_client, NULL, NULL); |
| 1608 | conn->verify_sha1_client = NULL; |
| 1609 | return -1; |
| 1610 | } |
| 1611 | conn->verify_md5_client = NULL; |
| 1612 | hlen = SHA1_MAC_LEN; |
| 1613 | if (conn->verify_sha1_client == NULL || |
| 1614 | crypto_hash_finish(conn->verify_sha1_client, hash + MD5_MAC_LEN, |
| 1615 | &hlen) < 0) { |
| 1616 | conn->verify_sha1_client = NULL; |
| 1617 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1618 | TLS_ALERT_INTERNAL_ERROR); |
| 1619 | return -1; |
| 1620 | } |
| 1621 | conn->verify_sha1_client = NULL; |
| 1622 | |
| 1623 | if (tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN, |
| 1624 | "client finished", hash, MD5_MAC_LEN + SHA1_MAC_LEN, |
| 1625 | verify_data, TLS_VERIFY_DATA_LEN)) { |
| 1626 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate verify_data"); |
| 1627 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1628 | TLS_ALERT_INTERNAL_ERROR); |
| 1629 | return -1; |
| 1630 | } |
| 1631 | wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (client)", |
| 1632 | verify_data, TLS_VERIFY_DATA_LEN); |
| 1633 | |
| 1634 | rhdr = pos; |
| 1635 | pos += TLS_RECORD_HEADER_LEN; |
| 1636 | /* Handshake */ |
| 1637 | hs_start = pos; |
| 1638 | /* HandshakeType msg_type */ |
| 1639 | *pos++ = TLS_HANDSHAKE_TYPE_FINISHED; |
| 1640 | /* uint24 length (to be filled) */ |
| 1641 | hs_length = pos; |
| 1642 | pos += 3; |
| 1643 | os_memcpy(pos, verify_data, TLS_VERIFY_DATA_LEN); |
| 1644 | pos += TLS_VERIFY_DATA_LEN; |
| 1645 | WPA_PUT_BE24(hs_length, pos - hs_length - 3); |
| 1646 | tls_verify_hash_add(conn, hs_start, pos - hs_start); |
| 1647 | |
| 1648 | if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE, |
| 1649 | rhdr, end - rhdr, pos - hs_start, &rlen) < 0) { |
| 1650 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record"); |
| 1651 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1652 | TLS_ALERT_INTERNAL_ERROR); |
| 1653 | return -1; |
| 1654 | } |
| 1655 | |
| 1656 | pos = rhdr + rlen; |
| 1657 | |
| 1658 | *msgpos = pos; |
| 1659 | |
| 1660 | return 0; |
| 1661 | } |
| 1662 | |
| 1663 | |
| 1664 | static size_t tls_client_cert_chain_der_len(struct tlsv1_client *conn) |
| 1665 | { |
| 1666 | size_t len = 0; |
| 1667 | struct x509_certificate *cert; |
| 1668 | |
| 1669 | cert = conn->client_cert; |
| 1670 | while (cert) { |
| 1671 | len += 3 + cert->cert_len; |
| 1672 | if (x509_certificate_self_signed(cert)) |
| 1673 | break; |
| 1674 | cert = x509_certificate_get_subject(conn->trusted_certs, |
| 1675 | &cert->issuer); |
| 1676 | } |
| 1677 | |
| 1678 | return len; |
| 1679 | } |
| 1680 | |
| 1681 | |
| 1682 | static u8 * tls_send_client_key_exchange(struct tlsv1_client *conn, |
| 1683 | size_t *out_len) |
| 1684 | { |
| 1685 | u8 *msg, *end, *pos; |
| 1686 | size_t msglen; |
| 1687 | |
| 1688 | *out_len = 0; |
| 1689 | |
| 1690 | msglen = 1000; |
| 1691 | if (conn->certificate_requested) |
| 1692 | msglen += tls_client_cert_chain_der_len(conn); |
| 1693 | |
| 1694 | msg = os_malloc(msglen); |
| 1695 | if (msg == NULL) |
| 1696 | return NULL; |
| 1697 | |
| 1698 | pos = msg; |
| 1699 | end = msg + msglen; |
| 1700 | |
| 1701 | if (conn->certificate_requested) { |
| 1702 | if (tls_write_client_certificate(conn, &pos, end) < 0) { |
| 1703 | os_free(msg); |
| 1704 | return NULL; |
| 1705 | } |
| 1706 | } |
| 1707 | |
| 1708 | if (tls_write_client_key_exchange(conn, &pos, end) < 0 || |
| 1709 | (conn->certificate_requested && conn->client_key && |
| 1710 | tls_write_client_certificate_verify(conn, &pos, end) < 0) || |
| 1711 | tls_write_client_change_cipher_spec(conn, &pos, end) < 0 || |
| 1712 | tls_write_client_finished(conn, &pos, end) < 0) { |
| 1713 | os_free(msg); |
| 1714 | return NULL; |
| 1715 | } |
| 1716 | |
| 1717 | *out_len = pos - msg; |
| 1718 | |
| 1719 | conn->state = SERVER_CHANGE_CIPHER_SPEC; |
| 1720 | |
| 1721 | return msg; |
| 1722 | } |
| 1723 | |
| 1724 | |
| 1725 | static u8 * tls_send_change_cipher_spec(struct tlsv1_client *conn, |
| 1726 | size_t *out_len) |
| 1727 | { |
| 1728 | u8 *msg, *end, *pos; |
| 1729 | |
| 1730 | *out_len = 0; |
| 1731 | |
| 1732 | msg = os_malloc(1000); |
| 1733 | if (msg == NULL) |
| 1734 | return NULL; |
| 1735 | |
| 1736 | pos = msg; |
| 1737 | end = msg + 1000; |
| 1738 | |
| 1739 | if (tls_write_client_change_cipher_spec(conn, &pos, end) < 0 || |
| 1740 | tls_write_client_finished(conn, &pos, end) < 0) { |
| 1741 | os_free(msg); |
| 1742 | return NULL; |
| 1743 | } |
| 1744 | |
| 1745 | *out_len = pos - msg; |
| 1746 | |
| 1747 | wpa_printf(MSG_DEBUG, "TLSv1: Session resumption completed " |
| 1748 | "successfully"); |
| 1749 | conn->state = ESTABLISHED; |
| 1750 | |
| 1751 | return msg; |
| 1752 | } |
| 1753 | |
| 1754 | |
| 1755 | static int tlsv1_client_process_handshake(struct tlsv1_client *conn, u8 ct, |
| 1756 | const u8 *buf, size_t *len) |
| 1757 | { |
| 1758 | if (ct == TLS_CONTENT_TYPE_HANDSHAKE && *len >= 4 && |
| 1759 | buf[0] == TLS_HANDSHAKE_TYPE_HELLO_REQUEST) { |
| 1760 | size_t hr_len = WPA_GET_BE24(buf + 1); |
| 1761 | if (hr_len > *len - 4) { |
| 1762 | wpa_printf(MSG_DEBUG, "TLSv1: HelloRequest underflow"); |
| 1763 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1764 | TLS_ALERT_DECODE_ERROR); |
| 1765 | return -1; |
| 1766 | } |
| 1767 | wpa_printf(MSG_DEBUG, "TLSv1: Ignored HelloRequest"); |
| 1768 | *len = 4 + hr_len; |
| 1769 | return 0; |
| 1770 | } |
| 1771 | |
| 1772 | switch (conn->state) { |
| 1773 | case SERVER_HELLO: |
| 1774 | if (tls_process_server_hello(conn, ct, buf, len)) |
| 1775 | return -1; |
| 1776 | break; |
| 1777 | case SERVER_CERTIFICATE: |
| 1778 | if (tls_process_certificate(conn, ct, buf, len)) |
| 1779 | return -1; |
| 1780 | break; |
| 1781 | case SERVER_KEY_EXCHANGE: |
| 1782 | if (tls_process_server_key_exchange(conn, ct, buf, len)) |
| 1783 | return -1; |
| 1784 | break; |
| 1785 | case SERVER_CERTIFICATE_REQUEST: |
| 1786 | if (tls_process_certificate_request(conn, ct, buf, len)) |
| 1787 | return -1; |
| 1788 | break; |
| 1789 | case SERVER_HELLO_DONE: |
| 1790 | if (tls_process_server_hello_done(conn, ct, buf, len)) |
| 1791 | return -1; |
| 1792 | break; |
| 1793 | case SERVER_CHANGE_CIPHER_SPEC: |
| 1794 | if (tls_process_server_change_cipher_spec(conn, ct, buf, len)) |
| 1795 | return -1; |
| 1796 | break; |
| 1797 | case SERVER_FINISHED: |
| 1798 | if (tls_process_server_finished(conn, ct, buf, len)) |
| 1799 | return -1; |
| 1800 | break; |
| 1801 | default: |
| 1802 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected state %d " |
| 1803 | "while processing received message", |
| 1804 | conn->state); |
| 1805 | return -1; |
| 1806 | } |
| 1807 | |
| 1808 | if (ct == TLS_CONTENT_TYPE_HANDSHAKE) |
| 1809 | tls_verify_hash_add(conn, buf, *len); |
| 1810 | |
| 1811 | return 0; |
| 1812 | } |
| 1813 | |
| 1814 | |
| 1815 | /** |
| 1816 | * tlsv1_client_handshake - Process TLS handshake |
| 1817 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 1818 | * @in_data: Input data from TLS peer |
| 1819 | * @in_len: Input data length |
| 1820 | * @out_len: Length of the output buffer. |
| 1821 | * Returns: Pointer to output data, %NULL on failure |
| 1822 | */ |
| 1823 | u8 * tlsv1_client_handshake(struct tlsv1_client *conn, |
| 1824 | const u8 *in_data, size_t in_len, |
| 1825 | size_t *out_len) |
| 1826 | { |
| 1827 | const u8 *pos, *end; |
| 1828 | u8 *msg = NULL, *in_msg, *in_pos, *in_end, alert, ct; |
| 1829 | size_t in_msg_len; |
| 1830 | |
| 1831 | if (conn->state == CLIENT_HELLO) { |
| 1832 | if (in_len) |
| 1833 | return NULL; |
| 1834 | return tls_send_client_hello(conn, out_len); |
| 1835 | } |
| 1836 | |
| 1837 | if (in_data == NULL || in_len == 0) |
| 1838 | return NULL; |
| 1839 | |
| 1840 | pos = in_data; |
| 1841 | end = in_data + in_len; |
| 1842 | in_msg = os_malloc(in_len); |
| 1843 | if (in_msg == NULL) |
| 1844 | return NULL; |
| 1845 | |
| 1846 | /* Each received packet may include multiple records */ |
| 1847 | while (pos < end) { |
| 1848 | in_msg_len = in_len; |
| 1849 | if (tlsv1_record_receive(&conn->rl, pos, end - pos, |
| 1850 | in_msg, &in_msg_len, &alert)) { |
| 1851 | wpa_printf(MSG_DEBUG, "TLSv1: Processing received " |
| 1852 | "record failed"); |
| 1853 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert); |
| 1854 | goto failed; |
| 1855 | } |
| 1856 | ct = pos[0]; |
| 1857 | |
| 1858 | in_pos = in_msg; |
| 1859 | in_end = in_msg + in_msg_len; |
| 1860 | |
| 1861 | /* Each received record may include multiple messages of the |
| 1862 | * same ContentType. */ |
| 1863 | while (in_pos < in_end) { |
| 1864 | in_msg_len = in_end - in_pos; |
| 1865 | if (tlsv1_client_process_handshake(conn, ct, in_pos, |
| 1866 | &in_msg_len) < 0) |
| 1867 | goto failed; |
| 1868 | in_pos += in_msg_len; |
| 1869 | } |
| 1870 | |
| 1871 | pos += TLS_RECORD_HEADER_LEN + WPA_GET_BE16(pos + 3); |
| 1872 | } |
| 1873 | |
| 1874 | os_free(in_msg); |
| 1875 | in_msg = NULL; |
| 1876 | |
| 1877 | switch (conn->state) { |
| 1878 | case CLIENT_KEY_EXCHANGE: |
| 1879 | msg = tls_send_client_key_exchange(conn, out_len); |
| 1880 | break; |
| 1881 | case CHANGE_CIPHER_SPEC: |
| 1882 | msg = tls_send_change_cipher_spec(conn, out_len); |
| 1883 | break; |
| 1884 | case ACK_FINISHED: |
| 1885 | wpa_printf(MSG_DEBUG, "TLSv1: Handshake completed " |
| 1886 | "successfully"); |
| 1887 | conn->state = ESTABLISHED; |
| 1888 | /* Need to return something to get final TLS ACK. */ |
| 1889 | msg = os_malloc(1); |
| 1890 | *out_len = 0; |
| 1891 | break; |
| 1892 | default: |
| 1893 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected state %d while " |
| 1894 | "generating reply", conn->state); |
| 1895 | break; |
| 1896 | } |
| 1897 | |
| 1898 | failed: |
| 1899 | os_free(in_msg); |
| 1900 | if (conn->alert_level) { |
| 1901 | conn->state = FAILED; |
| 1902 | os_free(msg); |
| 1903 | msg = tls_send_alert(conn, conn->alert_level, |
| 1904 | conn->alert_description, out_len); |
| 1905 | } |
| 1906 | |
| 1907 | return msg; |
| 1908 | } |
| 1909 | |
| 1910 | |
| 1911 | /** |
| 1912 | * tlsv1_client_encrypt - Encrypt data into TLS tunnel |
| 1913 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 1914 | * @in_data: Pointer to plaintext data to be encrypted |
| 1915 | * @in_len: Input buffer length |
| 1916 | * @out_data: Pointer to output buffer (encrypted TLS data) |
| 1917 | * @out_len: Maximum out_data length |
| 1918 | * Returns: Number of bytes written to out_data, -1 on failure |
| 1919 | * |
| 1920 | * This function is used after TLS handshake has been completed successfully to |
| 1921 | * send data in the encrypted tunnel. |
| 1922 | */ |
| 1923 | int tlsv1_client_encrypt(struct tlsv1_client *conn, |
| 1924 | const u8 *in_data, size_t in_len, |
| 1925 | u8 *out_data, size_t out_len) |
| 1926 | { |
| 1927 | size_t rlen; |
| 1928 | |
| 1929 | wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Plaintext AppData", |
| 1930 | in_data, in_len); |
| 1931 | |
| 1932 | os_memcpy(out_data + TLS_RECORD_HEADER_LEN, in_data, in_len); |
| 1933 | |
| 1934 | if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_APPLICATION_DATA, |
| 1935 | out_data, out_len, in_len, &rlen) < 0) { |
| 1936 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record"); |
| 1937 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1938 | TLS_ALERT_INTERNAL_ERROR); |
| 1939 | return -1; |
| 1940 | } |
| 1941 | |
| 1942 | return rlen; |
| 1943 | } |
| 1944 | |
| 1945 | |
| 1946 | /** |
| 1947 | * tlsv1_client_decrypt - Decrypt data from TLS tunnel |
| 1948 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 1949 | * @in_data: Pointer to input buffer (encrypted TLS data) |
| 1950 | * @in_len: Input buffer length |
| 1951 | * @out_data: Pointer to output buffer (decrypted data from TLS tunnel) |
| 1952 | * @out_len: Maximum out_data length |
| 1953 | * Returns: Number of bytes written to out_data, -1 on failure |
| 1954 | * |
| 1955 | * This function is used after TLS handshake has been completed successfully to |
| 1956 | * receive data from the encrypted tunnel. |
| 1957 | */ |
| 1958 | int tlsv1_client_decrypt(struct tlsv1_client *conn, |
| 1959 | const u8 *in_data, size_t in_len, |
| 1960 | u8 *out_data, size_t out_len) |
| 1961 | { |
| 1962 | const u8 *in_end, *pos; |
| 1963 | int res; |
| 1964 | u8 alert, *out_end, *out_pos; |
| 1965 | size_t olen; |
| 1966 | |
| 1967 | pos = in_data; |
| 1968 | in_end = in_data + in_len; |
| 1969 | out_pos = out_data; |
| 1970 | out_end = out_data + out_len; |
| 1971 | |
| 1972 | while (pos < in_end) { |
| 1973 | if (pos[0] != TLS_CONTENT_TYPE_APPLICATION_DATA) { |
| 1974 | wpa_printf(MSG_DEBUG, "TLSv1: Unexpected content type " |
| 1975 | "0x%x", pos[0]); |
| 1976 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1977 | TLS_ALERT_UNEXPECTED_MESSAGE); |
| 1978 | return -1; |
| 1979 | } |
| 1980 | |
| 1981 | olen = out_end - out_pos; |
| 1982 | res = tlsv1_record_receive(&conn->rl, pos, in_end - pos, |
| 1983 | out_pos, &olen, &alert); |
| 1984 | if (res < 0) { |
| 1985 | wpa_printf(MSG_DEBUG, "TLSv1: Record layer processing " |
| 1986 | "failed"); |
| 1987 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert); |
| 1988 | return -1; |
| 1989 | } |
| 1990 | out_pos += olen; |
| 1991 | if (out_pos > out_end) { |
| 1992 | wpa_printf(MSG_DEBUG, "TLSv1: Buffer not large enough " |
| 1993 | "for processing the received record"); |
| 1994 | tls_alert(conn, TLS_ALERT_LEVEL_FATAL, |
| 1995 | TLS_ALERT_INTERNAL_ERROR); |
| 1996 | return -1; |
| 1997 | } |
| 1998 | |
| 1999 | pos += TLS_RECORD_HEADER_LEN + WPA_GET_BE16(pos + 3); |
| 2000 | } |
| 2001 | |
| 2002 | return out_pos - out_data; |
| 2003 | } |
| 2004 | |
| 2005 | |
| 2006 | /** |
| 2007 | * tlsv1_client_global_init - Initialize TLSv1 client |
| 2008 | * Returns: 0 on success, -1 on failure |
| 2009 | * |
| 2010 | * This function must be called before using any other TLSv1 client functions. |
| 2011 | */ |
| 2012 | int tlsv1_client_global_init(void) |
| 2013 | { |
| 2014 | return crypto_global_init(); |
| 2015 | } |
| 2016 | |
| 2017 | |
| 2018 | /** |
| 2019 | * tlsv1_client_global_deinit - Deinitialize TLSv1 client |
| 2020 | * |
| 2021 | * This function can be used to deinitialize the TLSv1 client that was |
| 2022 | * initialized by calling tlsv1_client_global_init(). No TLSv1 client functions |
| 2023 | * can be called after this before calling tlsv1_client_global_init() again. |
| 2024 | */ |
| 2025 | void tlsv1_client_global_deinit(void) |
| 2026 | { |
| 2027 | crypto_global_deinit(); |
| 2028 | } |
| 2029 | |
| 2030 | |
| 2031 | static void tlsv1_client_free_verify_hashes(struct tlsv1_client *conn) |
| 2032 | { |
| 2033 | crypto_hash_finish(conn->verify_md5_client, NULL, NULL); |
| 2034 | crypto_hash_finish(conn->verify_md5_server, NULL, NULL); |
| 2035 | crypto_hash_finish(conn->verify_md5_cert, NULL, NULL); |
| 2036 | crypto_hash_finish(conn->verify_sha1_client, NULL, NULL); |
| 2037 | crypto_hash_finish(conn->verify_sha1_server, NULL, NULL); |
| 2038 | crypto_hash_finish(conn->verify_sha1_cert, NULL, NULL); |
| 2039 | conn->verify_md5_client = NULL; |
| 2040 | conn->verify_md5_server = NULL; |
| 2041 | conn->verify_md5_cert = NULL; |
| 2042 | conn->verify_sha1_client = NULL; |
| 2043 | conn->verify_sha1_server = NULL; |
| 2044 | conn->verify_sha1_cert = NULL; |
| 2045 | } |
| 2046 | |
| 2047 | |
| 2048 | static int tlsv1_client_init_verify_hashes(struct tlsv1_client *conn) |
| 2049 | { |
| 2050 | conn->verify_md5_client = crypto_hash_init(CRYPTO_HASH_ALG_MD5, NULL, |
| 2051 | 0); |
| 2052 | conn->verify_md5_server = crypto_hash_init(CRYPTO_HASH_ALG_MD5, NULL, |
| 2053 | 0); |
| 2054 | conn->verify_md5_cert = crypto_hash_init(CRYPTO_HASH_ALG_MD5, NULL, 0); |
| 2055 | conn->verify_sha1_client = crypto_hash_init(CRYPTO_HASH_ALG_SHA1, NULL, |
| 2056 | 0); |
| 2057 | conn->verify_sha1_server = crypto_hash_init(CRYPTO_HASH_ALG_SHA1, NULL, |
| 2058 | 0); |
| 2059 | conn->verify_sha1_cert = crypto_hash_init(CRYPTO_HASH_ALG_SHA1, NULL, |
| 2060 | 0); |
| 2061 | if (conn->verify_md5_client == NULL || |
| 2062 | conn->verify_md5_server == NULL || |
| 2063 | conn->verify_md5_cert == NULL || |
| 2064 | conn->verify_sha1_client == NULL || |
| 2065 | conn->verify_sha1_server == NULL || |
| 2066 | conn->verify_sha1_cert == NULL) { |
| 2067 | tlsv1_client_free_verify_hashes(conn); |
| 2068 | return -1; |
| 2069 | } |
| 2070 | return 0; |
| 2071 | } |
| 2072 | |
| 2073 | |
| 2074 | /** |
| 2075 | * tlsv1_client_init - Initialize TLSv1 client connection |
| 2076 | * Returns: Pointer to TLSv1 client connection data or %NULL on failure |
| 2077 | */ |
| 2078 | struct tlsv1_client * tlsv1_client_init(void) |
| 2079 | { |
| 2080 | struct tlsv1_client *conn; |
| 2081 | size_t count; |
| 2082 | u16 *suites; |
| 2083 | |
| 2084 | conn = os_zalloc(sizeof(*conn)); |
| 2085 | if (conn == NULL) |
| 2086 | return NULL; |
| 2087 | |
| 2088 | conn->state = CLIENT_HELLO; |
| 2089 | |
| 2090 | if (tlsv1_client_init_verify_hashes(conn) < 0) { |
| 2091 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to initialize verify " |
| 2092 | "hash"); |
| 2093 | os_free(conn); |
| 2094 | return NULL; |
| 2095 | } |
| 2096 | |
| 2097 | count = 0; |
| 2098 | suites = conn->cipher_suites; |
| 2099 | #ifndef CONFIG_CRYPTO_INTERNAL |
| 2100 | suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA; |
| 2101 | #endif /* CONFIG_CRYPTO_INTERNAL */ |
| 2102 | suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA; |
| 2103 | suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA; |
| 2104 | suites[count++] = TLS_RSA_WITH_RC4_128_SHA; |
| 2105 | suites[count++] = TLS_RSA_WITH_RC4_128_MD5; |
| 2106 | conn->num_cipher_suites = count; |
| 2107 | |
| 2108 | return conn; |
| 2109 | } |
| 2110 | |
| 2111 | |
| 2112 | /** |
| 2113 | * tlsv1_client_deinit - Deinitialize TLSv1 client connection |
| 2114 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2115 | */ |
| 2116 | void tlsv1_client_deinit(struct tlsv1_client *conn) |
| 2117 | { |
| 2118 | crypto_public_key_free(conn->server_rsa_key); |
| 2119 | tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL); |
| 2120 | tlsv1_record_change_write_cipher(&conn->rl); |
| 2121 | tlsv1_record_change_read_cipher(&conn->rl); |
| 2122 | tlsv1_client_free_verify_hashes(conn); |
| 2123 | os_free(conn->client_hello_ext); |
| 2124 | tlsv1_client_free_dh(conn); |
| 2125 | x509_certificate_chain_free(conn->trusted_certs); |
| 2126 | x509_certificate_chain_free(conn->client_cert); |
| 2127 | crypto_private_key_free(conn->client_key); |
| 2128 | os_free(conn); |
| 2129 | } |
| 2130 | |
| 2131 | |
| 2132 | /** |
| 2133 | * tlsv1_client_established - Check whether connection has been established |
| 2134 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2135 | * Returns: 1 if connection is established, 0 if not |
| 2136 | */ |
| 2137 | int tlsv1_client_established(struct tlsv1_client *conn) |
| 2138 | { |
| 2139 | return conn->state == ESTABLISHED; |
| 2140 | } |
| 2141 | |
| 2142 | |
| 2143 | /** |
| 2144 | * tlsv1_client_prf - Use TLS-PRF to derive keying material |
| 2145 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2146 | * @label: Label (e.g., description of the key) for PRF |
| 2147 | * @server_random_first: seed is 0 = client_random|server_random, |
| 2148 | * 1 = server_random|client_random |
| 2149 | * @out: Buffer for output data from TLS-PRF |
| 2150 | * @out_len: Length of the output buffer |
| 2151 | * Returns: 0 on success, -1 on failure |
| 2152 | */ |
| 2153 | int tlsv1_client_prf(struct tlsv1_client *conn, const char *label, |
| 2154 | int server_random_first, u8 *out, size_t out_len) |
| 2155 | { |
| 2156 | u8 seed[2 * TLS_RANDOM_LEN]; |
| 2157 | |
| 2158 | if (conn->state != ESTABLISHED) |
| 2159 | return -1; |
| 2160 | |
| 2161 | if (server_random_first) { |
| 2162 | os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN); |
| 2163 | os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, |
| 2164 | TLS_RANDOM_LEN); |
| 2165 | } else { |
| 2166 | os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN); |
| 2167 | os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random, |
| 2168 | TLS_RANDOM_LEN); |
| 2169 | } |
| 2170 | |
| 2171 | return tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN, |
| 2172 | label, seed, 2 * TLS_RANDOM_LEN, out, out_len); |
| 2173 | } |
| 2174 | |
| 2175 | |
| 2176 | /** |
| 2177 | * tlsv1_client_get_cipher - Get current cipher name |
| 2178 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2179 | * @buf: Buffer for the cipher name |
| 2180 | * @buflen: buf size |
| 2181 | * Returns: 0 on success, -1 on failure |
| 2182 | * |
| 2183 | * Get the name of the currently used cipher. |
| 2184 | */ |
| 2185 | int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf, |
| 2186 | size_t buflen) |
| 2187 | { |
| 2188 | char *cipher; |
| 2189 | |
| 2190 | switch (conn->rl.cipher_suite) { |
| 2191 | case TLS_RSA_WITH_RC4_128_MD5: |
| 2192 | cipher = "RC4-MD5"; |
| 2193 | break; |
| 2194 | case TLS_RSA_WITH_RC4_128_SHA: |
| 2195 | cipher = "RC4-SHA"; |
| 2196 | break; |
| 2197 | case TLS_RSA_WITH_DES_CBC_SHA: |
| 2198 | cipher = "DES-CBC-SHA"; |
| 2199 | break; |
| 2200 | case TLS_RSA_WITH_3DES_EDE_CBC_SHA: |
| 2201 | cipher = "DES-CBC3-SHA"; |
| 2202 | break; |
| 2203 | default: |
| 2204 | return -1; |
| 2205 | } |
| 2206 | |
| 2207 | os_snprintf(buf, buflen, "%s", cipher); |
| 2208 | return 0; |
| 2209 | } |
| 2210 | |
| 2211 | |
| 2212 | /** |
| 2213 | * tlsv1_client_shutdown - Shutdown TLS connection |
| 2214 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2215 | * Returns: 0 on success, -1 on failure |
| 2216 | */ |
| 2217 | int tlsv1_client_shutdown(struct tlsv1_client *conn) |
| 2218 | { |
| 2219 | conn->state = CLIENT_HELLO; |
| 2220 | |
| 2221 | tlsv1_client_free_verify_hashes(conn); |
| 2222 | if (tlsv1_client_init_verify_hashes(conn) < 0) { |
| 2223 | wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify " |
| 2224 | "hash"); |
| 2225 | return -1; |
| 2226 | } |
| 2227 | |
| 2228 | tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL); |
| 2229 | tlsv1_record_change_write_cipher(&conn->rl); |
| 2230 | tlsv1_record_change_read_cipher(&conn->rl); |
| 2231 | |
| 2232 | conn->certificate_requested = 0; |
| 2233 | crypto_public_key_free(conn->server_rsa_key); |
| 2234 | conn->server_rsa_key = NULL; |
| 2235 | conn->session_resumed = 0; |
| 2236 | |
| 2237 | return 0; |
| 2238 | } |
| 2239 | |
| 2240 | |
| 2241 | /** |
| 2242 | * tlsv1_client_resumed - Was session resumption used |
| 2243 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2244 | * Returns: 1 if current session used session resumption, 0 if not |
| 2245 | */ |
| 2246 | int tlsv1_client_resumed(struct tlsv1_client *conn) |
| 2247 | { |
| 2248 | return !!conn->session_resumed; |
| 2249 | } |
| 2250 | |
| 2251 | |
| 2252 | /** |
| 2253 | * tlsv1_client_hello_ext - Set TLS extension for ClientHello |
| 2254 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2255 | * @ext_type: Extension type |
| 2256 | * @data: Extension payload (%NULL to remove extension) |
| 2257 | * @data_len: Extension payload length |
| 2258 | * Returns: 0 on success, -1 on failure |
| 2259 | */ |
| 2260 | int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type, |
| 2261 | const u8 *data, size_t data_len) |
| 2262 | { |
| 2263 | u8 *pos; |
| 2264 | |
| 2265 | conn->ticket = 0; |
| 2266 | os_free(conn->client_hello_ext); |
| 2267 | conn->client_hello_ext = NULL; |
| 2268 | conn->client_hello_ext_len = 0; |
| 2269 | |
| 2270 | if (data == NULL || data_len == 0) |
| 2271 | return 0; |
| 2272 | |
| 2273 | pos = conn->client_hello_ext = os_malloc(6 + data_len); |
| 2274 | if (pos == NULL) |
| 2275 | return -1; |
| 2276 | |
| 2277 | WPA_PUT_BE16(pos, 4 + data_len); |
| 2278 | pos += 2; |
| 2279 | WPA_PUT_BE16(pos, ext_type); |
| 2280 | pos += 2; |
| 2281 | WPA_PUT_BE16(pos, data_len); |
| 2282 | pos += 2; |
| 2283 | os_memcpy(pos, data, data_len); |
| 2284 | conn->client_hello_ext_len = 6 + data_len; |
| 2285 | |
| 2286 | if (ext_type == TLS_EXT_PAC_OPAQUE) { |
| 2287 | conn->ticket = 1; |
| 2288 | wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket"); |
| 2289 | } |
| 2290 | |
| 2291 | return 0; |
| 2292 | } |
| 2293 | |
| 2294 | |
| 2295 | /** |
| 2296 | * tlsv1_client_get_keys - Get master key and random data from TLS connection |
| 2297 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2298 | * @keys: Structure of key/random data (filled on success) |
| 2299 | * Returns: 0 on success, -1 on failure |
| 2300 | */ |
| 2301 | int tlsv1_client_get_keys(struct tlsv1_client *conn, struct tls_keys *keys) |
| 2302 | { |
| 2303 | os_memset(keys, 0, sizeof(*keys)); |
| 2304 | if (conn->state == CLIENT_HELLO) |
| 2305 | return -1; |
| 2306 | |
| 2307 | keys->client_random = conn->client_random; |
| 2308 | keys->client_random_len = TLS_RANDOM_LEN; |
| 2309 | |
| 2310 | if (conn->state != SERVER_HELLO) { |
| 2311 | keys->server_random = conn->server_random; |
| 2312 | keys->server_random_len = TLS_RANDOM_LEN; |
| 2313 | keys->master_key = conn->master_secret; |
| 2314 | keys->master_key_len = TLS_MASTER_SECRET_LEN; |
| 2315 | } |
| 2316 | |
| 2317 | return 0; |
| 2318 | } |
| 2319 | |
| 2320 | |
| 2321 | /** |
| 2322 | * tlsv1_client_set_master_key - Configure master secret for TLS connection |
| 2323 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2324 | * @key: TLS pre-master-secret |
| 2325 | * @key_len: length of key in bytes |
| 2326 | * Returns: 0 on success, -1 on failure |
| 2327 | */ |
| 2328 | int tlsv1_client_set_master_key(struct tlsv1_client *conn, |
| 2329 | const u8 *key, size_t key_len) |
| 2330 | { |
| 2331 | if (key_len > TLS_MASTER_SECRET_LEN) |
| 2332 | return -1; |
| 2333 | wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret from session " |
| 2334 | "ticket", key, key_len); |
| 2335 | os_memcpy(conn->master_secret, key, key_len); |
| 2336 | conn->ticket_key = 1; |
| 2337 | |
| 2338 | return 0; |
| 2339 | } |
| 2340 | |
| 2341 | |
| 2342 | /** |
| 2343 | * tlsv1_client_get_keyblock_size - Get TLS key_block size |
| 2344 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2345 | * Returns: Size of the key_block for the negotiated cipher suite or -1 on |
| 2346 | * failure |
| 2347 | */ |
| 2348 | int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn) |
| 2349 | { |
| 2350 | if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO) |
| 2351 | return -1; |
| 2352 | |
| 2353 | return 2 * (conn->rl.hash_size + conn->rl.key_material_len + |
| 2354 | conn->rl.iv_size); |
| 2355 | } |
| 2356 | |
| 2357 | |
| 2358 | /** |
| 2359 | * tlsv1_client_set_cipher_list - Configure acceptable cipher suites |
| 2360 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2361 | * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers |
| 2362 | * (TLS_CIPHER_*). |
| 2363 | * Returns: 0 on success, -1 on failure |
| 2364 | */ |
| 2365 | int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers) |
| 2366 | { |
| 2367 | #ifdef EAP_FAST |
| 2368 | size_t count; |
| 2369 | u16 *suites; |
| 2370 | |
| 2371 | /* TODO: implement proper configuration of cipher suites */ |
| 2372 | if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) { |
| 2373 | count = 0; |
| 2374 | suites = conn->cipher_suites; |
| 2375 | suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA; |
| 2376 | suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA; |
| 2377 | suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA; |
| 2378 | suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5; |
| 2379 | suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA; |
| 2380 | conn->num_cipher_suites = count; |
| 2381 | } |
| 2382 | |
| 2383 | return 0; |
| 2384 | #else /* EAP_FAST */ |
| 2385 | return -1; |
| 2386 | #endif /* EAP_FAST */ |
| 2387 | } |
| 2388 | |
| 2389 | |
| 2390 | static int tlsv1_client_add_cert_der(struct x509_certificate **chain, |
| 2391 | const u8 *buf, size_t len) |
| 2392 | { |
| 2393 | struct x509_certificate *cert; |
| 2394 | char name[128]; |
| 2395 | |
| 2396 | cert = x509_certificate_parse(buf, len); |
| 2397 | if (cert == NULL) { |
| 2398 | wpa_printf(MSG_INFO, "TLSv1: %s - failed to parse certificate", |
| 2399 | __func__); |
| 2400 | return -1; |
| 2401 | } |
| 2402 | |
| 2403 | cert->next = *chain; |
| 2404 | *chain = cert; |
| 2405 | |
| 2406 | x509_name_string(&cert->subject, name, sizeof(name)); |
| 2407 | wpa_printf(MSG_DEBUG, "TLSv1: Added certificate: %s", name); |
| 2408 | |
| 2409 | return 0; |
| 2410 | } |
| 2411 | |
| 2412 | |
| 2413 | static const char *pem_cert_begin = "-----BEGIN CERTIFICATE-----"; |
| 2414 | static const char *pem_cert_end = "-----END CERTIFICATE-----"; |
| 2415 | |
| 2416 | |
| 2417 | static const u8 * search_tag(const char *tag, const u8 *buf, size_t len) |
| 2418 | { |
| 2419 | size_t i, plen; |
| 2420 | |
| 2421 | plen = os_strlen(tag); |
| 2422 | if (len < plen) |
| 2423 | return NULL; |
| 2424 | |
| 2425 | for (i = 0; i < len - plen; i++) { |
| 2426 | if (os_memcmp(buf + i, tag, plen) == 0) |
| 2427 | return buf + i; |
| 2428 | } |
| 2429 | |
| 2430 | return NULL; |
| 2431 | } |
| 2432 | |
| 2433 | |
| 2434 | static int tlsv1_client_add_cert(struct x509_certificate **chain, |
| 2435 | const u8 *buf, size_t len) |
| 2436 | { |
| 2437 | const u8 *pos, *end; |
| 2438 | unsigned char *der; |
| 2439 | size_t der_len; |
| 2440 | |
| 2441 | pos = search_tag(pem_cert_begin, buf, len); |
| 2442 | if (!pos) { |
| 2443 | wpa_printf(MSG_DEBUG, "TLSv1: No PEM certificate tag found - " |
| 2444 | "assume DER format"); |
| 2445 | return tlsv1_client_add_cert_der(chain, buf, len); |
| 2446 | } |
| 2447 | |
| 2448 | wpa_printf(MSG_DEBUG, "TLSv1: Converting PEM format certificate into " |
| 2449 | "DER format"); |
| 2450 | |
| 2451 | while (pos) { |
| 2452 | pos += os_strlen(pem_cert_begin); |
| 2453 | end = search_tag(pem_cert_end, pos, buf + len - pos); |
| 2454 | if (end == NULL) { |
| 2455 | wpa_printf(MSG_INFO, "TLSv1: Could not find PEM " |
| 2456 | "certificate end tag (%s)", pem_cert_end); |
| 2457 | return -1; |
| 2458 | } |
| 2459 | |
| 2460 | der = base64_decode(pos, end - pos, &der_len); |
| 2461 | if (der == NULL) { |
| 2462 | wpa_printf(MSG_INFO, "TLSv1: Could not decode PEM " |
| 2463 | "certificate"); |
| 2464 | return -1; |
| 2465 | } |
| 2466 | |
| 2467 | if (tlsv1_client_add_cert_der(chain, der, der_len) < 0) { |
| 2468 | wpa_printf(MSG_INFO, "TLSv1: Failed to parse PEM " |
| 2469 | "certificate after DER conversion"); |
| 2470 | os_free(der); |
| 2471 | return -1; |
| 2472 | } |
| 2473 | |
| 2474 | os_free(der); |
| 2475 | |
| 2476 | end += os_strlen(pem_cert_end); |
| 2477 | pos = search_tag(pem_cert_begin, end, buf + len - end); |
| 2478 | } |
| 2479 | |
| 2480 | return 0; |
| 2481 | } |
| 2482 | |
| 2483 | |
| 2484 | static int tlsv1_client_set_cert_chain(struct x509_certificate **chain, |
| 2485 | const char *cert, const u8 *cert_blob, |
| 2486 | size_t cert_blob_len) |
| 2487 | { |
| 2488 | if (cert_blob) |
| 2489 | return tlsv1_client_add_cert(chain, cert_blob, cert_blob_len); |
| 2490 | |
| 2491 | if (cert) { |
| 2492 | u8 *buf; |
| 2493 | size_t len; |
| 2494 | int ret; |
| 2495 | |
| 2496 | buf = (u8 *) os_readfile(cert, &len); |
| 2497 | if (buf == NULL) { |
| 2498 | wpa_printf(MSG_INFO, "TLSv1: Failed to read '%s'", |
| 2499 | cert); |
| 2500 | return -1; |
| 2501 | } |
| 2502 | |
| 2503 | ret = tlsv1_client_add_cert(chain, buf, len); |
| 2504 | os_free(buf); |
| 2505 | return ret; |
| 2506 | } |
| 2507 | |
| 2508 | return 0; |
| 2509 | } |
| 2510 | |
| 2511 | |
| 2512 | /** |
| 2513 | * tlsv1_client_set_ca_cert - Set trusted CA certificate(s) |
| 2514 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2515 | * @cert: File or reference name for X.509 certificate in PEM or DER format |
| 2516 | * @cert_blob: cert as inlined data or %NULL if not used |
| 2517 | * @cert_blob_len: ca_cert_blob length |
| 2518 | * @path: Path to CA certificates (not yet supported) |
| 2519 | * Returns: 0 on success, -1 on failure |
| 2520 | */ |
| 2521 | int tlsv1_client_set_ca_cert(struct tlsv1_client *conn, const char *cert, |
| 2522 | const u8 *cert_blob, size_t cert_blob_len, |
| 2523 | const char *path) |
| 2524 | { |
| 2525 | if (tlsv1_client_set_cert_chain(&conn->trusted_certs, cert, |
| 2526 | cert_blob, cert_blob_len) < 0) |
| 2527 | return -1; |
| 2528 | |
| 2529 | if (path) { |
| 2530 | /* TODO: add support for reading number of certificate files */ |
| 2531 | wpa_printf(MSG_INFO, "TLSv1: Use of CA certificate directory " |
| 2532 | "not yet supported"); |
| 2533 | return -1; |
| 2534 | } |
| 2535 | |
| 2536 | return 0; |
| 2537 | } |
| 2538 | |
| 2539 | |
| 2540 | /** |
| 2541 | * tlsv1_client_set_client_cert - Set client certificate |
| 2542 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2543 | * @cert: File or reference name for X.509 certificate in PEM or DER format |
| 2544 | * @cert_blob: cert as inlined data or %NULL if not used |
| 2545 | * @cert_blob_len: ca_cert_blob length |
| 2546 | * Returns: 0 on success, -1 on failure |
| 2547 | */ |
| 2548 | int tlsv1_client_set_client_cert(struct tlsv1_client *conn, const char *cert, |
| 2549 | const u8 *cert_blob, size_t cert_blob_len) |
| 2550 | { |
| 2551 | return tlsv1_client_set_cert_chain(&conn->client_cert, cert, |
| 2552 | cert_blob, cert_blob_len); |
| 2553 | } |
| 2554 | |
| 2555 | |
| 2556 | static int tlsv1_client_set_key(struct tlsv1_client *conn, |
| 2557 | const u8 *key, size_t len) |
| 2558 | { |
| 2559 | conn->client_key = crypto_private_key_import(key, len); |
| 2560 | if (conn->client_key == NULL) { |
| 2561 | wpa_printf(MSG_INFO, "TLSv1: Failed to parse private key"); |
| 2562 | return -1; |
| 2563 | } |
| 2564 | return 0; |
| 2565 | } |
| 2566 | |
| 2567 | |
| 2568 | /** |
| 2569 | * tlsv1_client_set_private_key - Set client private key |
| 2570 | * @conn: TLSv1 client connection data from tlsv1_client_init() |
| 2571 | * @private_key: File or reference name for the key in PEM or DER format |
| 2572 | * @private_key_passwd: Passphrase for decrypted private key, %NULL if no |
| 2573 | * passphrase is used. |
| 2574 | * @private_key_blob: private_key as inlined data or %NULL if not used |
| 2575 | * @private_key_blob_len: private_key_blob length |
| 2576 | * Returns: 0 on success, -1 on failure |
| 2577 | */ |
| 2578 | int tlsv1_client_set_private_key(struct tlsv1_client *conn, |
| 2579 | const char *private_key, |
| 2580 | const char *private_key_passwd, |
| 2581 | const u8 *private_key_blob, |
| 2582 | size_t private_key_blob_len) |
| 2583 | { |
| 2584 | crypto_private_key_free(conn->client_key); |
| 2585 | conn->client_key = NULL; |
| 2586 | |
| 2587 | if (private_key_blob) |
| 2588 | return tlsv1_client_set_key(conn, private_key_blob, |
| 2589 | private_key_blob_len); |
| 2590 | |
| 2591 | if (private_key) { |
| 2592 | u8 *buf; |
| 2593 | size_t len; |
| 2594 | int ret; |
| 2595 | |
| 2596 | buf = (u8 *) os_readfile(private_key, &len); |
| 2597 | if (buf == NULL) { |
| 2598 | wpa_printf(MSG_INFO, "TLSv1: Failed to read '%s'", |
| 2599 | private_key); |
| 2600 | return -1; |
| 2601 | } |
| 2602 | |
| 2603 | ret = tlsv1_client_set_key(conn, buf, len); |
| 2604 | os_free(buf); |
| 2605 | return ret; |
| 2606 | } |
| 2607 | |
| 2608 | return 0; |
| 2609 | } |