1 /* 2 * SSL/TLS interface functions for OpenSSL 3 * Copyright (c) 2004-2015, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #ifndef CONFIG_SMARTCARD 12 #ifndef OPENSSL_NO_ENGINE 13 #ifndef ANDROID 14 #define OPENSSL_NO_ENGINE 15 #endif 16 #endif 17 #endif 18 19 #include <openssl/ssl.h> 20 #include <openssl/err.h> 21 #include <openssl/pkcs12.h> 22 #include <openssl/x509v3.h> 23 #ifndef OPENSSL_NO_ENGINE 24 #include <openssl/engine.h> 25 #endif /* OPENSSL_NO_ENGINE */ 26 #ifndef OPENSSL_NO_DSA 27 #include <openssl/dsa.h> 28 #endif 29 #ifndef OPENSSL_NO_DH 30 #include <openssl/dh.h> 31 #endif 32 33 #include "common.h" 34 #include "crypto.h" 35 #include "sha1.h" 36 #include "sha256.h" 37 #include "tls.h" 38 #include "tls_openssl.h" 39 40 #if defined(OPENSSL_IS_BORINGSSL) 41 /* stack_index_t is the return type of OpenSSL's sk_XXX_num() functions. */ 42 typedef size_t stack_index_t; 43 #else 44 typedef int stack_index_t; 45 #endif 46 47 #ifdef SSL_set_tlsext_status_type 48 #ifndef OPENSSL_NO_TLSEXT 49 #define HAVE_OCSP 50 #include <openssl/ocsp.h> 51 #endif /* OPENSSL_NO_TLSEXT */ 52 #endif /* SSL_set_tlsext_status_type */ 53 54 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER) 55 /* 56 * SSL_get_client_random() and SSL_get_server_random() were added in OpenSSL 57 * 1.1.0. Provide compatibility wrappers for older versions. 58 */ 59 60 static size_t SSL_get_client_random(const SSL *ssl, unsigned char *out, 61 size_t outlen) 62 { 63 if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE) 64 return 0; 65 os_memcpy(out, ssl->s3->client_random, SSL3_RANDOM_SIZE); 66 return SSL3_RANDOM_SIZE; 67 } 68 69 70 static size_t SSL_get_server_random(const SSL *ssl, unsigned char *out, 71 size_t outlen) 72 { 73 if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE) 74 return 0; 75 os_memcpy(out, ssl->s3->server_random, SSL3_RANDOM_SIZE); 76 return SSL3_RANDOM_SIZE; 77 } 78 79 80 static size_t SSL_SESSION_get_master_key(const SSL_SESSION *session, 81 unsigned char *out, size_t outlen) 82 { 83 if (!session || session->master_key_length < 0 || 84 (size_t) session->master_key_length > outlen) 85 return 0; 86 if ((size_t) session->master_key_length < outlen) 87 outlen = session->master_key_length; 88 os_memcpy(out, session->master_key, outlen); 89 return outlen; 90 } 91 92 #endif 93 94 #ifdef ANDROID 95 #include <openssl/pem.h> 96 #include <keystore/keystore_get.h> 97 98 static BIO * BIO_from_keystore(const char *key) 99 { 100 BIO *bio = NULL; 101 uint8_t *value = NULL; 102 int length = keystore_get(key, strlen(key), &value); 103 if (length != -1 && (bio = BIO_new(BIO_s_mem())) != NULL) 104 BIO_write(bio, value, length); 105 free(value); 106 return bio; 107 } 108 109 110 static int tls_add_ca_from_keystore(X509_STORE *ctx, const char *key_alias) 111 { 112 BIO *bio = BIO_from_keystore(key_alias); 113 STACK_OF(X509_INFO) *stack = NULL; 114 stack_index_t i; 115 116 if (bio) { 117 stack = PEM_X509_INFO_read_bio(bio, NULL, NULL, NULL); 118 BIO_free(bio); 119 } 120 121 if (!stack) { 122 wpa_printf(MSG_WARNING, "TLS: Failed to parse certificate: %s", 123 key_alias); 124 return -1; 125 } 126 127 for (i = 0; i < sk_X509_INFO_num(stack); ++i) { 128 X509_INFO *info = sk_X509_INFO_value(stack, i); 129 130 if (info->x509) 131 X509_STORE_add_cert(ctx, info->x509); 132 if (info->crl) 133 X509_STORE_add_crl(ctx, info->crl); 134 } 135 136 sk_X509_INFO_pop_free(stack, X509_INFO_free); 137 138 return 0; 139 } 140 141 142 static int tls_add_ca_from_keystore_encoded(X509_STORE *ctx, 143 const char *encoded_key_alias) 144 { 145 int rc = -1; 146 int len = os_strlen(encoded_key_alias); 147 unsigned char *decoded_alias; 148 149 if (len & 1) { 150 wpa_printf(MSG_WARNING, "Invalid hex-encoded alias: %s", 151 encoded_key_alias); 152 return rc; 153 } 154 155 decoded_alias = os_malloc(len / 2 + 1); 156 if (decoded_alias) { 157 if (!hexstr2bin(encoded_key_alias, decoded_alias, len / 2)) { 158 decoded_alias[len / 2] = '\0'; 159 rc = tls_add_ca_from_keystore( 160 ctx, (const char *) decoded_alias); 161 } 162 os_free(decoded_alias); 163 } 164 165 return rc; 166 } 167 168 #endif /* ANDROID */ 169 170 static int tls_openssl_ref_count = 0; 171 static int tls_ex_idx_session = -1; 172 173 struct tls_context { 174 void (*event_cb)(void *ctx, enum tls_event ev, 175 union tls_event_data *data); 176 void *cb_ctx; 177 int cert_in_cb; 178 char *ocsp_stapling_response; 179 }; 180 181 static struct tls_context *tls_global = NULL; 182 183 184 struct tls_data { 185 SSL_CTX *ssl; 186 unsigned int tls_session_lifetime; 187 }; 188 189 struct tls_connection { 190 struct tls_context *context; 191 SSL_CTX *ssl_ctx; 192 SSL *ssl; 193 BIO *ssl_in, *ssl_out; 194 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE) 195 ENGINE *engine; /* functional reference to the engine */ 196 EVP_PKEY *private_key; /* the private key if using engine */ 197 #endif /* OPENSSL_NO_ENGINE */ 198 char *subject_match, *altsubject_match, *suffix_match, *domain_match; 199 int read_alerts, write_alerts, failed; 200 201 tls_session_ticket_cb session_ticket_cb; 202 void *session_ticket_cb_ctx; 203 204 /* SessionTicket received from OpenSSL hello_extension_cb (server) */ 205 u8 *session_ticket; 206 size_t session_ticket_len; 207 208 unsigned int ca_cert_verify:1; 209 unsigned int cert_probe:1; 210 unsigned int server_cert_only:1; 211 unsigned int invalid_hb_used:1; 212 unsigned int success_data:1; 213 214 u8 srv_cert_hash[32]; 215 216 unsigned int flags; 217 218 X509 *peer_cert; 219 X509 *peer_issuer; 220 X509 *peer_issuer_issuer; 221 222 unsigned char client_random[SSL3_RANDOM_SIZE]; 223 unsigned char server_random[SSL3_RANDOM_SIZE]; 224 }; 225 226 227 static struct tls_context * tls_context_new(const struct tls_config *conf) 228 { 229 struct tls_context *context = os_zalloc(sizeof(*context)); 230 if (context == NULL) 231 return NULL; 232 if (conf) { 233 context->event_cb = conf->event_cb; 234 context->cb_ctx = conf->cb_ctx; 235 context->cert_in_cb = conf->cert_in_cb; 236 } 237 return context; 238 } 239 240 241 #ifdef CONFIG_NO_STDOUT_DEBUG 242 243 static void _tls_show_errors(void) 244 { 245 unsigned long err; 246 247 while ((err = ERR_get_error())) { 248 /* Just ignore the errors, since stdout is disabled */ 249 } 250 } 251 #define tls_show_errors(l, f, t) _tls_show_errors() 252 253 #else /* CONFIG_NO_STDOUT_DEBUG */ 254 255 static void tls_show_errors(int level, const char *func, const char *txt) 256 { 257 unsigned long err; 258 259 wpa_printf(level, "OpenSSL: %s - %s %s", 260 func, txt, ERR_error_string(ERR_get_error(), NULL)); 261 262 while ((err = ERR_get_error())) { 263 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s", 264 ERR_error_string(err, NULL)); 265 } 266 } 267 268 #endif /* CONFIG_NO_STDOUT_DEBUG */ 269 270 271 #ifdef CONFIG_NATIVE_WINDOWS 272 273 /* Windows CryptoAPI and access to certificate stores */ 274 #include <wincrypt.h> 275 276 #ifdef __MINGW32_VERSION 277 /* 278 * MinGW does not yet include all the needed definitions for CryptoAPI, so 279 * define here whatever extra is needed. 280 */ 281 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16) 282 #define CERT_STORE_READONLY_FLAG 0x00008000 283 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000 284 285 #endif /* __MINGW32_VERSION */ 286 287 288 struct cryptoapi_rsa_data { 289 const CERT_CONTEXT *cert; 290 HCRYPTPROV crypt_prov; 291 DWORD key_spec; 292 BOOL free_crypt_prov; 293 }; 294 295 296 static void cryptoapi_error(const char *msg) 297 { 298 wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u", 299 msg, (unsigned int) GetLastError()); 300 } 301 302 303 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from, 304 unsigned char *to, RSA *rsa, int padding) 305 { 306 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__); 307 return 0; 308 } 309 310 311 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from, 312 unsigned char *to, RSA *rsa, int padding) 313 { 314 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__); 315 return 0; 316 } 317 318 319 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from, 320 unsigned char *to, RSA *rsa, int padding) 321 { 322 struct cryptoapi_rsa_data *priv = 323 (struct cryptoapi_rsa_data *) rsa->meth->app_data; 324 HCRYPTHASH hash; 325 DWORD hash_size, len, i; 326 unsigned char *buf = NULL; 327 int ret = 0; 328 329 if (priv == NULL) { 330 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, 331 ERR_R_PASSED_NULL_PARAMETER); 332 return 0; 333 } 334 335 if (padding != RSA_PKCS1_PADDING) { 336 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, 337 RSA_R_UNKNOWN_PADDING_TYPE); 338 return 0; 339 } 340 341 if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) { 342 wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported", 343 __func__); 344 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, 345 RSA_R_INVALID_MESSAGE_LENGTH); 346 return 0; 347 } 348 349 if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash)) 350 { 351 cryptoapi_error("CryptCreateHash failed"); 352 return 0; 353 } 354 355 len = sizeof(hash_size); 356 if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len, 357 0)) { 358 cryptoapi_error("CryptGetHashParam failed"); 359 goto err; 360 } 361 362 if ((int) hash_size != flen) { 363 wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)", 364 (unsigned) hash_size, flen); 365 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, 366 RSA_R_INVALID_MESSAGE_LENGTH); 367 goto err; 368 } 369 if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) { 370 cryptoapi_error("CryptSetHashParam failed"); 371 goto err; 372 } 373 374 len = RSA_size(rsa); 375 buf = os_malloc(len); 376 if (buf == NULL) { 377 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE); 378 goto err; 379 } 380 381 if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) { 382 cryptoapi_error("CryptSignHash failed"); 383 goto err; 384 } 385 386 for (i = 0; i < len; i++) 387 to[i] = buf[len - i - 1]; 388 ret = len; 389 390 err: 391 os_free(buf); 392 CryptDestroyHash(hash); 393 394 return ret; 395 } 396 397 398 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from, 399 unsigned char *to, RSA *rsa, int padding) 400 { 401 wpa_printf(MSG_DEBUG, "%s - not implemented", __func__); 402 return 0; 403 } 404 405 406 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv) 407 { 408 if (priv == NULL) 409 return; 410 if (priv->crypt_prov && priv->free_crypt_prov) 411 CryptReleaseContext(priv->crypt_prov, 0); 412 if (priv->cert) 413 CertFreeCertificateContext(priv->cert); 414 os_free(priv); 415 } 416 417 418 static int cryptoapi_finish(RSA *rsa) 419 { 420 cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data); 421 os_free((void *) rsa->meth); 422 rsa->meth = NULL; 423 return 1; 424 } 425 426 427 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store) 428 { 429 HCERTSTORE cs; 430 const CERT_CONTEXT *ret = NULL; 431 432 cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0, 433 store | CERT_STORE_OPEN_EXISTING_FLAG | 434 CERT_STORE_READONLY_FLAG, L"MY"); 435 if (cs == NULL) { 436 cryptoapi_error("Failed to open 'My system store'"); 437 return NULL; 438 } 439 440 if (strncmp(name, "cert://", 7) == 0) { 441 unsigned short wbuf[255]; 442 MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255); 443 ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING | 444 PKCS_7_ASN_ENCODING, 445 0, CERT_FIND_SUBJECT_STR, 446 wbuf, NULL); 447 } else if (strncmp(name, "hash://", 7) == 0) { 448 CRYPT_HASH_BLOB blob; 449 int len; 450 const char *hash = name + 7; 451 unsigned char *buf; 452 453 len = os_strlen(hash) / 2; 454 buf = os_malloc(len); 455 if (buf && hexstr2bin(hash, buf, len) == 0) { 456 blob.cbData = len; 457 blob.pbData = buf; 458 ret = CertFindCertificateInStore(cs, 459 X509_ASN_ENCODING | 460 PKCS_7_ASN_ENCODING, 461 0, CERT_FIND_HASH, 462 &blob, NULL); 463 } 464 os_free(buf); 465 } 466 467 CertCloseStore(cs, 0); 468 469 return ret; 470 } 471 472 473 static int tls_cryptoapi_cert(SSL *ssl, const char *name) 474 { 475 X509 *cert = NULL; 476 RSA *rsa = NULL, *pub_rsa; 477 struct cryptoapi_rsa_data *priv; 478 RSA_METHOD *rsa_meth; 479 480 if (name == NULL || 481 (strncmp(name, "cert://", 7) != 0 && 482 strncmp(name, "hash://", 7) != 0)) 483 return -1; 484 485 priv = os_zalloc(sizeof(*priv)); 486 rsa_meth = os_zalloc(sizeof(*rsa_meth)); 487 if (priv == NULL || rsa_meth == NULL) { 488 wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory " 489 "for CryptoAPI RSA method"); 490 os_free(priv); 491 os_free(rsa_meth); 492 return -1; 493 } 494 495 priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER); 496 if (priv->cert == NULL) { 497 priv->cert = cryptoapi_find_cert( 498 name, CERT_SYSTEM_STORE_LOCAL_MACHINE); 499 } 500 if (priv->cert == NULL) { 501 wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate " 502 "'%s'", name); 503 goto err; 504 } 505 506 cert = d2i_X509(NULL, 507 (const unsigned char **) &priv->cert->pbCertEncoded, 508 priv->cert->cbCertEncoded); 509 if (cert == NULL) { 510 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER " 511 "encoding"); 512 goto err; 513 } 514 515 if (!CryptAcquireCertificatePrivateKey(priv->cert, 516 CRYPT_ACQUIRE_COMPARE_KEY_FLAG, 517 NULL, &priv->crypt_prov, 518 &priv->key_spec, 519 &priv->free_crypt_prov)) { 520 cryptoapi_error("Failed to acquire a private key for the " 521 "certificate"); 522 goto err; 523 } 524 525 rsa_meth->name = "Microsoft CryptoAPI RSA Method"; 526 rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc; 527 rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec; 528 rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc; 529 rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec; 530 rsa_meth->finish = cryptoapi_finish; 531 rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK; 532 rsa_meth->app_data = (char *) priv; 533 534 rsa = RSA_new(); 535 if (rsa == NULL) { 536 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE, 537 ERR_R_MALLOC_FAILURE); 538 goto err; 539 } 540 541 if (!SSL_use_certificate(ssl, cert)) { 542 RSA_free(rsa); 543 rsa = NULL; 544 goto err; 545 } 546 pub_rsa = cert->cert_info->key->pkey->pkey.rsa; 547 X509_free(cert); 548 cert = NULL; 549 550 rsa->n = BN_dup(pub_rsa->n); 551 rsa->e = BN_dup(pub_rsa->e); 552 if (!RSA_set_method(rsa, rsa_meth)) 553 goto err; 554 555 if (!SSL_use_RSAPrivateKey(ssl, rsa)) 556 goto err; 557 RSA_free(rsa); 558 559 return 0; 560 561 err: 562 if (cert) 563 X509_free(cert); 564 if (rsa) 565 RSA_free(rsa); 566 else { 567 os_free(rsa_meth); 568 cryptoapi_free_data(priv); 569 } 570 return -1; 571 } 572 573 574 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name) 575 { 576 HCERTSTORE cs; 577 PCCERT_CONTEXT ctx = NULL; 578 X509 *cert; 579 char buf[128]; 580 const char *store; 581 #ifdef UNICODE 582 WCHAR *wstore; 583 #endif /* UNICODE */ 584 585 if (name == NULL || strncmp(name, "cert_store://", 13) != 0) 586 return -1; 587 588 store = name + 13; 589 #ifdef UNICODE 590 wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR)); 591 if (wstore == NULL) 592 return -1; 593 wsprintf(wstore, L"%S", store); 594 cs = CertOpenSystemStore(0, wstore); 595 os_free(wstore); 596 #else /* UNICODE */ 597 cs = CertOpenSystemStore(0, store); 598 #endif /* UNICODE */ 599 if (cs == NULL) { 600 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store " 601 "'%s': error=%d", __func__, store, 602 (int) GetLastError()); 603 return -1; 604 } 605 606 while ((ctx = CertEnumCertificatesInStore(cs, ctx))) { 607 cert = d2i_X509(NULL, 608 (const unsigned char **) &ctx->pbCertEncoded, 609 ctx->cbCertEncoded); 610 if (cert == NULL) { 611 wpa_printf(MSG_INFO, "CryptoAPI: Could not process " 612 "X509 DER encoding for CA cert"); 613 continue; 614 } 615 616 X509_NAME_oneline(X509_get_subject_name(cert), buf, 617 sizeof(buf)); 618 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for " 619 "system certificate store: subject='%s'", buf); 620 621 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) { 622 tls_show_errors(MSG_WARNING, __func__, 623 "Failed to add ca_cert to OpenSSL " 624 "certificate store"); 625 } 626 627 X509_free(cert); 628 } 629 630 if (!CertCloseStore(cs, 0)) { 631 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store " 632 "'%s': error=%d", __func__, name + 13, 633 (int) GetLastError()); 634 } 635 636 return 0; 637 } 638 639 640 #else /* CONFIG_NATIVE_WINDOWS */ 641 642 static int tls_cryptoapi_cert(SSL *ssl, const char *name) 643 { 644 return -1; 645 } 646 647 #endif /* CONFIG_NATIVE_WINDOWS */ 648 649 650 static void ssl_info_cb(const SSL *ssl, int where, int ret) 651 { 652 const char *str; 653 int w; 654 655 wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret); 656 w = where & ~SSL_ST_MASK; 657 if (w & SSL_ST_CONNECT) 658 str = "SSL_connect"; 659 else if (w & SSL_ST_ACCEPT) 660 str = "SSL_accept"; 661 else 662 str = "undefined"; 663 664 if (where & SSL_CB_LOOP) { 665 wpa_printf(MSG_DEBUG, "SSL: %s:%s", 666 str, SSL_state_string_long(ssl)); 667 } else if (where & SSL_CB_ALERT) { 668 struct tls_connection *conn = SSL_get_app_data((SSL *) ssl); 669 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s", 670 where & SSL_CB_READ ? 671 "read (remote end reported an error)" : 672 "write (local SSL3 detected an error)", 673 SSL_alert_type_string_long(ret), 674 SSL_alert_desc_string_long(ret)); 675 if ((ret >> 8) == SSL3_AL_FATAL) { 676 if (where & SSL_CB_READ) 677 conn->read_alerts++; 678 else 679 conn->write_alerts++; 680 } 681 if (conn->context->event_cb != NULL) { 682 union tls_event_data ev; 683 struct tls_context *context = conn->context; 684 os_memset(&ev, 0, sizeof(ev)); 685 ev.alert.is_local = !(where & SSL_CB_READ); 686 ev.alert.type = SSL_alert_type_string_long(ret); 687 ev.alert.description = SSL_alert_desc_string_long(ret); 688 context->event_cb(context->cb_ctx, TLS_ALERT, &ev); 689 } 690 } else if (where & SSL_CB_EXIT && ret <= 0) { 691 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s", 692 str, ret == 0 ? "failed" : "error", 693 SSL_state_string_long(ssl)); 694 } 695 } 696 697 698 #ifndef OPENSSL_NO_ENGINE 699 /** 700 * tls_engine_load_dynamic_generic - load any openssl engine 701 * @pre: an array of commands and values that load an engine initialized 702 * in the engine specific function 703 * @post: an array of commands and values that initialize an already loaded 704 * engine (or %NULL if not required) 705 * @id: the engine id of the engine to load (only required if post is not %NULL 706 * 707 * This function is a generic function that loads any openssl engine. 708 * 709 * Returns: 0 on success, -1 on failure 710 */ 711 static int tls_engine_load_dynamic_generic(const char *pre[], 712 const char *post[], const char *id) 713 { 714 ENGINE *engine; 715 const char *dynamic_id = "dynamic"; 716 717 engine = ENGINE_by_id(id); 718 if (engine) { 719 ENGINE_free(engine); 720 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already " 721 "available", id); 722 return 0; 723 } 724 ERR_clear_error(); 725 726 engine = ENGINE_by_id(dynamic_id); 727 if (engine == NULL) { 728 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]", 729 dynamic_id, 730 ERR_error_string(ERR_get_error(), NULL)); 731 return -1; 732 } 733 734 /* Perform the pre commands. This will load the engine. */ 735 while (pre && pre[0]) { 736 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]); 737 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) { 738 wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: " 739 "%s %s [%s]", pre[0], pre[1], 740 ERR_error_string(ERR_get_error(), NULL)); 741 ENGINE_free(engine); 742 return -1; 743 } 744 pre += 2; 745 } 746 747 /* 748 * Free the reference to the "dynamic" engine. The loaded engine can 749 * now be looked up using ENGINE_by_id(). 750 */ 751 ENGINE_free(engine); 752 753 engine = ENGINE_by_id(id); 754 if (engine == NULL) { 755 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]", 756 id, ERR_error_string(ERR_get_error(), NULL)); 757 return -1; 758 } 759 760 while (post && post[0]) { 761 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]); 762 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) { 763 wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:" 764 " %s %s [%s]", post[0], post[1], 765 ERR_error_string(ERR_get_error(), NULL)); 766 ENGINE_remove(engine); 767 ENGINE_free(engine); 768 return -1; 769 } 770 post += 2; 771 } 772 ENGINE_free(engine); 773 774 return 0; 775 } 776 777 778 /** 779 * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc 780 * @pkcs11_so_path: pksc11_so_path from the configuration 781 * @pcks11_module_path: pkcs11_module_path from the configuration 782 */ 783 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path, 784 const char *pkcs11_module_path) 785 { 786 char *engine_id = "pkcs11"; 787 const char *pre_cmd[] = { 788 "SO_PATH", NULL /* pkcs11_so_path */, 789 "ID", NULL /* engine_id */, 790 "LIST_ADD", "1", 791 /* "NO_VCHECK", "1", */ 792 "LOAD", NULL, 793 NULL, NULL 794 }; 795 const char *post_cmd[] = { 796 "MODULE_PATH", NULL /* pkcs11_module_path */, 797 NULL, NULL 798 }; 799 800 if (!pkcs11_so_path) 801 return 0; 802 803 pre_cmd[1] = pkcs11_so_path; 804 pre_cmd[3] = engine_id; 805 if (pkcs11_module_path) 806 post_cmd[1] = pkcs11_module_path; 807 else 808 post_cmd[0] = NULL; 809 810 wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s", 811 pkcs11_so_path); 812 813 return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id); 814 } 815 816 817 /** 818 * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc 819 * @opensc_so_path: opensc_so_path from the configuration 820 */ 821 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path) 822 { 823 char *engine_id = "opensc"; 824 const char *pre_cmd[] = { 825 "SO_PATH", NULL /* opensc_so_path */, 826 "ID", NULL /* engine_id */, 827 "LIST_ADD", "1", 828 "LOAD", NULL, 829 NULL, NULL 830 }; 831 832 if (!opensc_so_path) 833 return 0; 834 835 pre_cmd[1] = opensc_so_path; 836 pre_cmd[3] = engine_id; 837 838 wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s", 839 opensc_so_path); 840 841 return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id); 842 } 843 #endif /* OPENSSL_NO_ENGINE */ 844 845 846 static void remove_session_cb(SSL_CTX *ctx, SSL_SESSION *sess) 847 { 848 struct wpabuf *buf; 849 850 if (tls_ex_idx_session < 0) 851 return; 852 buf = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session); 853 if (!buf) 854 return; 855 wpa_printf(MSG_DEBUG, 856 "OpenSSL: Free application session data %p (sess %p)", 857 buf, sess); 858 wpabuf_free(buf); 859 860 SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, NULL); 861 } 862 863 864 void * tls_init(const struct tls_config *conf) 865 { 866 struct tls_data *data; 867 SSL_CTX *ssl; 868 struct tls_context *context; 869 const char *ciphers; 870 871 if (tls_openssl_ref_count == 0) { 872 tls_global = context = tls_context_new(conf); 873 if (context == NULL) 874 return NULL; 875 #ifdef CONFIG_FIPS 876 #ifdef OPENSSL_FIPS 877 if (conf && conf->fips_mode) { 878 static int fips_enabled = 0; 879 880 if (!fips_enabled && !FIPS_mode_set(1)) { 881 wpa_printf(MSG_ERROR, "Failed to enable FIPS " 882 "mode"); 883 ERR_load_crypto_strings(); 884 ERR_print_errors_fp(stderr); 885 os_free(tls_global); 886 tls_global = NULL; 887 return NULL; 888 } else { 889 wpa_printf(MSG_INFO, "Running in FIPS mode"); 890 fips_enabled = 1; 891 } 892 } 893 #else /* OPENSSL_FIPS */ 894 if (conf && conf->fips_mode) { 895 wpa_printf(MSG_ERROR, "FIPS mode requested, but not " 896 "supported"); 897 os_free(tls_global); 898 tls_global = NULL; 899 return NULL; 900 } 901 #endif /* OPENSSL_FIPS */ 902 #endif /* CONFIG_FIPS */ 903 #if OPENSSL_VERSION_NUMBER < 0x10100000L 904 SSL_load_error_strings(); 905 SSL_library_init(); 906 #ifndef OPENSSL_NO_SHA256 907 EVP_add_digest(EVP_sha256()); 908 #endif /* OPENSSL_NO_SHA256 */ 909 /* TODO: if /dev/urandom is available, PRNG is seeded 910 * automatically. If this is not the case, random data should 911 * be added here. */ 912 913 #ifdef PKCS12_FUNCS 914 #ifndef OPENSSL_NO_RC2 915 /* 916 * 40-bit RC2 is commonly used in PKCS#12 files, so enable it. 917 * This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8 918 * versions, but it looks like OpenSSL 1.0.0 does not do that 919 * anymore. 920 */ 921 EVP_add_cipher(EVP_rc2_40_cbc()); 922 #endif /* OPENSSL_NO_RC2 */ 923 PKCS12_PBE_add(); 924 #endif /* PKCS12_FUNCS */ 925 #endif /* < 1.1.0 */ 926 } else { 927 context = tls_context_new(conf); 928 if (context == NULL) 929 return NULL; 930 } 931 tls_openssl_ref_count++; 932 933 data = os_zalloc(sizeof(*data)); 934 if (data) 935 ssl = SSL_CTX_new(SSLv23_method()); 936 else 937 ssl = NULL; 938 if (ssl == NULL) { 939 tls_openssl_ref_count--; 940 if (context != tls_global) 941 os_free(context); 942 if (tls_openssl_ref_count == 0) { 943 os_free(tls_global); 944 tls_global = NULL; 945 } 946 os_free(data); 947 return NULL; 948 } 949 data->ssl = ssl; 950 if (conf) 951 data->tls_session_lifetime = conf->tls_session_lifetime; 952 953 SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv2); 954 SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv3); 955 956 SSL_CTX_set_info_callback(ssl, ssl_info_cb); 957 SSL_CTX_set_app_data(ssl, context); 958 if (data->tls_session_lifetime > 0) { 959 SSL_CTX_set_quiet_shutdown(ssl, 1); 960 /* 961 * Set default context here. In practice, this will be replaced 962 * by the per-EAP method context in tls_connection_set_verify(). 963 */ 964 SSL_CTX_set_session_id_context(ssl, (u8 *) "hostapd", 7); 965 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_SERVER); 966 SSL_CTX_set_timeout(ssl, data->tls_session_lifetime); 967 SSL_CTX_sess_set_remove_cb(ssl, remove_session_cb); 968 } else { 969 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_OFF); 970 } 971 972 if (tls_ex_idx_session < 0) { 973 tls_ex_idx_session = SSL_SESSION_get_ex_new_index( 974 0, NULL, NULL, NULL, NULL); 975 if (tls_ex_idx_session < 0) { 976 tls_deinit(data); 977 return NULL; 978 } 979 } 980 981 #ifndef OPENSSL_NO_ENGINE 982 wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine"); 983 ERR_load_ENGINE_strings(); 984 ENGINE_load_dynamic(); 985 986 if (conf && 987 (conf->opensc_engine_path || conf->pkcs11_engine_path || 988 conf->pkcs11_module_path)) { 989 if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) || 990 tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path, 991 conf->pkcs11_module_path)) { 992 tls_deinit(data); 993 return NULL; 994 } 995 } 996 #endif /* OPENSSL_NO_ENGINE */ 997 998 if (conf && conf->openssl_ciphers) 999 ciphers = conf->openssl_ciphers; 1000 else 1001 ciphers = "DEFAULT:!EXP:!LOW"; 1002 if (SSL_CTX_set_cipher_list(ssl, ciphers) != 1) { 1003 wpa_printf(MSG_ERROR, 1004 "OpenSSL: Failed to set cipher string '%s'", 1005 ciphers); 1006 tls_deinit(data); 1007 return NULL; 1008 } 1009 1010 return data; 1011 } 1012 1013 1014 void tls_deinit(void *ssl_ctx) 1015 { 1016 struct tls_data *data = ssl_ctx; 1017 SSL_CTX *ssl = data->ssl; 1018 struct tls_context *context = SSL_CTX_get_app_data(ssl); 1019 if (context != tls_global) 1020 os_free(context); 1021 if (data->tls_session_lifetime > 0) 1022 SSL_CTX_flush_sessions(ssl, 0); 1023 SSL_CTX_free(ssl); 1024 1025 tls_openssl_ref_count--; 1026 if (tls_openssl_ref_count == 0) { 1027 #if OPENSSL_VERSION_NUMBER < 0x10100000L 1028 #ifndef OPENSSL_NO_ENGINE 1029 ENGINE_cleanup(); 1030 #endif /* OPENSSL_NO_ENGINE */ 1031 CRYPTO_cleanup_all_ex_data(); 1032 ERR_remove_thread_state(NULL); 1033 ERR_free_strings(); 1034 EVP_cleanup(); 1035 #endif /* < 1.1.0 */ 1036 os_free(tls_global->ocsp_stapling_response); 1037 tls_global->ocsp_stapling_response = NULL; 1038 os_free(tls_global); 1039 tls_global = NULL; 1040 } 1041 1042 os_free(data); 1043 } 1044 1045 1046 #ifndef OPENSSL_NO_ENGINE 1047 1048 /* Cryptoki return values */ 1049 #define CKR_PIN_INCORRECT 0x000000a0 1050 #define CKR_PIN_INVALID 0x000000a1 1051 #define CKR_PIN_LEN_RANGE 0x000000a2 1052 1053 /* libp11 */ 1054 #define ERR_LIB_PKCS11 ERR_LIB_USER 1055 1056 static int tls_is_pin_error(unsigned int err) 1057 { 1058 return ERR_GET_LIB(err) == ERR_LIB_PKCS11 && 1059 (ERR_GET_REASON(err) == CKR_PIN_INCORRECT || 1060 ERR_GET_REASON(err) == CKR_PIN_INVALID || 1061 ERR_GET_REASON(err) == CKR_PIN_LEN_RANGE); 1062 } 1063 1064 #endif /* OPENSSL_NO_ENGINE */ 1065 1066 1067 #ifdef ANDROID 1068 /* EVP_PKEY_from_keystore comes from system/security/keystore-engine. */ 1069 EVP_PKEY * EVP_PKEY_from_keystore(const char *key_id); 1070 #endif /* ANDROID */ 1071 1072 static int tls_engine_init(struct tls_connection *conn, const char *engine_id, 1073 const char *pin, const char *key_id, 1074 const char *cert_id, const char *ca_cert_id) 1075 { 1076 #if defined(ANDROID) && defined(OPENSSL_IS_BORINGSSL) 1077 #if !defined(OPENSSL_NO_ENGINE) 1078 #error "This code depends on OPENSSL_NO_ENGINE being defined by BoringSSL." 1079 #endif 1080 if (!key_id) 1081 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED; 1082 conn->engine = NULL; 1083 conn->private_key = EVP_PKEY_from_keystore(key_id); 1084 if (!conn->private_key) { 1085 wpa_printf(MSG_ERROR, 1086 "ENGINE: cannot load private key with id '%s' [%s]", 1087 key_id, 1088 ERR_error_string(ERR_get_error(), NULL)); 1089 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED; 1090 } 1091 #endif /* ANDROID && OPENSSL_IS_BORINGSSL */ 1092 1093 #ifndef OPENSSL_NO_ENGINE 1094 int ret = -1; 1095 if (engine_id == NULL) { 1096 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set"); 1097 return -1; 1098 } 1099 1100 ERR_clear_error(); 1101 #ifdef ANDROID 1102 ENGINE_load_dynamic(); 1103 #endif 1104 conn->engine = ENGINE_by_id(engine_id); 1105 if (!conn->engine) { 1106 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]", 1107 engine_id, ERR_error_string(ERR_get_error(), NULL)); 1108 goto err; 1109 } 1110 if (ENGINE_init(conn->engine) != 1) { 1111 wpa_printf(MSG_ERROR, "ENGINE: engine init failed " 1112 "(engine: %s) [%s]", engine_id, 1113 ERR_error_string(ERR_get_error(), NULL)); 1114 goto err; 1115 } 1116 wpa_printf(MSG_DEBUG, "ENGINE: engine initialized"); 1117 1118 #ifndef ANDROID 1119 if (pin && ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) { 1120 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]", 1121 ERR_error_string(ERR_get_error(), NULL)); 1122 goto err; 1123 } 1124 #endif 1125 if (key_id) { 1126 /* 1127 * Ensure that the ENGINE does not attempt to use the OpenSSL 1128 * UI system to obtain a PIN, if we didn't provide one. 1129 */ 1130 struct { 1131 const void *password; 1132 const char *prompt_info; 1133 } key_cb = { "", NULL }; 1134 1135 /* load private key first in-case PIN is required for cert */ 1136 conn->private_key = ENGINE_load_private_key(conn->engine, 1137 key_id, NULL, 1138 &key_cb); 1139 if (!conn->private_key) { 1140 unsigned long err = ERR_get_error(); 1141 1142 wpa_printf(MSG_ERROR, 1143 "ENGINE: cannot load private key with id '%s' [%s]", 1144 key_id, 1145 ERR_error_string(err, NULL)); 1146 if (tls_is_pin_error(err)) 1147 ret = TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN; 1148 else 1149 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED; 1150 goto err; 1151 } 1152 } 1153 1154 /* handle a certificate and/or CA certificate */ 1155 if (cert_id || ca_cert_id) { 1156 const char *cmd_name = "LOAD_CERT_CTRL"; 1157 1158 /* test if the engine supports a LOAD_CERT_CTRL */ 1159 if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME, 1160 0, (void *)cmd_name, NULL)) { 1161 wpa_printf(MSG_ERROR, "ENGINE: engine does not support" 1162 " loading certificates"); 1163 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED; 1164 goto err; 1165 } 1166 } 1167 1168 return 0; 1169 1170 err: 1171 if (conn->engine) { 1172 ENGINE_free(conn->engine); 1173 conn->engine = NULL; 1174 } 1175 1176 if (conn->private_key) { 1177 EVP_PKEY_free(conn->private_key); 1178 conn->private_key = NULL; 1179 } 1180 1181 return ret; 1182 #else /* OPENSSL_NO_ENGINE */ 1183 return 0; 1184 #endif /* OPENSSL_NO_ENGINE */ 1185 } 1186 1187 1188 static void tls_engine_deinit(struct tls_connection *conn) 1189 { 1190 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE) 1191 wpa_printf(MSG_DEBUG, "ENGINE: engine deinit"); 1192 if (conn->private_key) { 1193 EVP_PKEY_free(conn->private_key); 1194 conn->private_key = NULL; 1195 } 1196 if (conn->engine) { 1197 #if !defined(OPENSSL_IS_BORINGSSL) 1198 ENGINE_finish(conn->engine); 1199 #endif /* !OPENSSL_IS_BORINGSSL */ 1200 conn->engine = NULL; 1201 } 1202 #endif /* ANDROID || !OPENSSL_NO_ENGINE */ 1203 } 1204 1205 1206 int tls_get_errors(void *ssl_ctx) 1207 { 1208 int count = 0; 1209 unsigned long err; 1210 1211 while ((err = ERR_get_error())) { 1212 wpa_printf(MSG_INFO, "TLS - SSL error: %s", 1213 ERR_error_string(err, NULL)); 1214 count++; 1215 } 1216 1217 return count; 1218 } 1219 1220 1221 static const char * openssl_content_type(int content_type) 1222 { 1223 switch (content_type) { 1224 case 20: 1225 return "change cipher spec"; 1226 case 21: 1227 return "alert"; 1228 case 22: 1229 return "handshake"; 1230 case 23: 1231 return "application data"; 1232 case 24: 1233 return "heartbeat"; 1234 case 256: 1235 return "TLS header info"; /* pseudo content type */ 1236 default: 1237 return "?"; 1238 } 1239 } 1240 1241 1242 static const char * openssl_handshake_type(int content_type, const u8 *buf, 1243 size_t len) 1244 { 1245 if (content_type != 22 || !buf || len == 0) 1246 return ""; 1247 switch (buf[0]) { 1248 case 0: 1249 return "hello request"; 1250 case 1: 1251 return "client hello"; 1252 case 2: 1253 return "server hello"; 1254 case 4: 1255 return "new session ticket"; 1256 case 11: 1257 return "certificate"; 1258 case 12: 1259 return "server key exchange"; 1260 case 13: 1261 return "certificate request"; 1262 case 14: 1263 return "server hello done"; 1264 case 15: 1265 return "certificate verify"; 1266 case 16: 1267 return "client key exchange"; 1268 case 20: 1269 return "finished"; 1270 case 21: 1271 return "certificate url"; 1272 case 22: 1273 return "certificate status"; 1274 default: 1275 return "?"; 1276 } 1277 } 1278 1279 1280 static void tls_msg_cb(int write_p, int version, int content_type, 1281 const void *buf, size_t len, SSL *ssl, void *arg) 1282 { 1283 struct tls_connection *conn = arg; 1284 const u8 *pos = buf; 1285 1286 if (write_p == 2) { 1287 wpa_printf(MSG_DEBUG, 1288 "OpenSSL: session ver=0x%x content_type=%d", 1289 version, content_type); 1290 wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Data", buf, len); 1291 return; 1292 } 1293 1294 wpa_printf(MSG_DEBUG, "OpenSSL: %s ver=0x%x content_type=%d (%s/%s)", 1295 write_p ? "TX" : "RX", version, content_type, 1296 openssl_content_type(content_type), 1297 openssl_handshake_type(content_type, buf, len)); 1298 wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Message", buf, len); 1299 if (content_type == 24 && len >= 3 && pos[0] == 1) { 1300 size_t payload_len = WPA_GET_BE16(pos + 1); 1301 if (payload_len + 3 > len) { 1302 wpa_printf(MSG_ERROR, "OpenSSL: Heartbeat attack detected"); 1303 conn->invalid_hb_used = 1; 1304 } 1305 } 1306 } 1307 1308 1309 struct tls_connection * tls_connection_init(void *ssl_ctx) 1310 { 1311 struct tls_data *data = ssl_ctx; 1312 SSL_CTX *ssl = data->ssl; 1313 struct tls_connection *conn; 1314 long options; 1315 struct tls_context *context = SSL_CTX_get_app_data(ssl); 1316 1317 conn = os_zalloc(sizeof(*conn)); 1318 if (conn == NULL) 1319 return NULL; 1320 conn->ssl_ctx = ssl; 1321 conn->ssl = SSL_new(ssl); 1322 if (conn->ssl == NULL) { 1323 tls_show_errors(MSG_INFO, __func__, 1324 "Failed to initialize new SSL connection"); 1325 os_free(conn); 1326 return NULL; 1327 } 1328 1329 conn->context = context; 1330 SSL_set_app_data(conn->ssl, conn); 1331 SSL_set_msg_callback(conn->ssl, tls_msg_cb); 1332 SSL_set_msg_callback_arg(conn->ssl, conn); 1333 options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | 1334 SSL_OP_SINGLE_DH_USE; 1335 #ifdef SSL_OP_NO_COMPRESSION 1336 options |= SSL_OP_NO_COMPRESSION; 1337 #endif /* SSL_OP_NO_COMPRESSION */ 1338 SSL_set_options(conn->ssl, options); 1339 1340 conn->ssl_in = BIO_new(BIO_s_mem()); 1341 if (!conn->ssl_in) { 1342 tls_show_errors(MSG_INFO, __func__, 1343 "Failed to create a new BIO for ssl_in"); 1344 SSL_free(conn->ssl); 1345 os_free(conn); 1346 return NULL; 1347 } 1348 1349 conn->ssl_out = BIO_new(BIO_s_mem()); 1350 if (!conn->ssl_out) { 1351 tls_show_errors(MSG_INFO, __func__, 1352 "Failed to create a new BIO for ssl_out"); 1353 SSL_free(conn->ssl); 1354 BIO_free(conn->ssl_in); 1355 os_free(conn); 1356 return NULL; 1357 } 1358 1359 SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out); 1360 1361 return conn; 1362 } 1363 1364 1365 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn) 1366 { 1367 if (conn == NULL) 1368 return; 1369 if (conn->success_data) { 1370 /* 1371 * Make sure ssl_clear_bad_session() does not remove this 1372 * session. 1373 */ 1374 SSL_set_quiet_shutdown(conn->ssl, 1); 1375 SSL_shutdown(conn->ssl); 1376 } 1377 SSL_free(conn->ssl); 1378 tls_engine_deinit(conn); 1379 os_free(conn->subject_match); 1380 os_free(conn->altsubject_match); 1381 os_free(conn->suffix_match); 1382 os_free(conn->domain_match); 1383 os_free(conn->session_ticket); 1384 os_free(conn); 1385 } 1386 1387 1388 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn) 1389 { 1390 return conn ? SSL_is_init_finished(conn->ssl) : 0; 1391 } 1392 1393 1394 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn) 1395 { 1396 if (conn == NULL) 1397 return -1; 1398 1399 /* Shutdown previous TLS connection without notifying the peer 1400 * because the connection was already terminated in practice 1401 * and "close notify" shutdown alert would confuse AS. */ 1402 SSL_set_quiet_shutdown(conn->ssl, 1); 1403 SSL_shutdown(conn->ssl); 1404 return SSL_clear(conn->ssl) == 1 ? 0 : -1; 1405 } 1406 1407 1408 static int tls_match_altsubject_component(X509 *cert, int type, 1409 const char *value, size_t len) 1410 { 1411 GENERAL_NAME *gen; 1412 void *ext; 1413 int found = 0; 1414 stack_index_t i; 1415 1416 ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL); 1417 1418 for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) { 1419 gen = sk_GENERAL_NAME_value(ext, i); 1420 if (gen->type != type) 1421 continue; 1422 if (os_strlen((char *) gen->d.ia5->data) == len && 1423 os_memcmp(value, gen->d.ia5->data, len) == 0) 1424 found++; 1425 } 1426 1427 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free); 1428 1429 return found; 1430 } 1431 1432 1433 static int tls_match_altsubject(X509 *cert, const char *match) 1434 { 1435 int type; 1436 const char *pos, *end; 1437 size_t len; 1438 1439 pos = match; 1440 do { 1441 if (os_strncmp(pos, "EMAIL:", 6) == 0) { 1442 type = GEN_EMAIL; 1443 pos += 6; 1444 } else if (os_strncmp(pos, "DNS:", 4) == 0) { 1445 type = GEN_DNS; 1446 pos += 4; 1447 } else if (os_strncmp(pos, "URI:", 4) == 0) { 1448 type = GEN_URI; 1449 pos += 4; 1450 } else { 1451 wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName " 1452 "match '%s'", pos); 1453 return 0; 1454 } 1455 end = os_strchr(pos, ';'); 1456 while (end) { 1457 if (os_strncmp(end + 1, "EMAIL:", 6) == 0 || 1458 os_strncmp(end + 1, "DNS:", 4) == 0 || 1459 os_strncmp(end + 1, "URI:", 4) == 0) 1460 break; 1461 end = os_strchr(end + 1, ';'); 1462 } 1463 if (end) 1464 len = end - pos; 1465 else 1466 len = os_strlen(pos); 1467 if (tls_match_altsubject_component(cert, type, pos, len) > 0) 1468 return 1; 1469 pos = end + 1; 1470 } while (end); 1471 1472 return 0; 1473 } 1474 1475 1476 #ifndef CONFIG_NATIVE_WINDOWS 1477 static int domain_suffix_match(const u8 *val, size_t len, const char *match, 1478 int full) 1479 { 1480 size_t i, match_len; 1481 1482 /* Check for embedded nuls that could mess up suffix matching */ 1483 for (i = 0; i < len; i++) { 1484 if (val[i] == '\0') { 1485 wpa_printf(MSG_DEBUG, "TLS: Embedded null in a string - reject"); 1486 return 0; 1487 } 1488 } 1489 1490 match_len = os_strlen(match); 1491 if (match_len > len || (full && match_len != len)) 1492 return 0; 1493 1494 if (os_strncasecmp((const char *) val + len - match_len, match, 1495 match_len) != 0) 1496 return 0; /* no match */ 1497 1498 if (match_len == len) 1499 return 1; /* exact match */ 1500 1501 if (val[len - match_len - 1] == '.') 1502 return 1; /* full label match completes suffix match */ 1503 1504 wpa_printf(MSG_DEBUG, "TLS: Reject due to incomplete label match"); 1505 return 0; 1506 } 1507 #endif /* CONFIG_NATIVE_WINDOWS */ 1508 1509 1510 static int tls_match_suffix(X509 *cert, const char *match, int full) 1511 { 1512 #ifdef CONFIG_NATIVE_WINDOWS 1513 /* wincrypt.h has conflicting X509_NAME definition */ 1514 return -1; 1515 #else /* CONFIG_NATIVE_WINDOWS */ 1516 GENERAL_NAME *gen; 1517 void *ext; 1518 int i; 1519 stack_index_t j; 1520 int dns_name = 0; 1521 X509_NAME *name; 1522 1523 wpa_printf(MSG_DEBUG, "TLS: Match domain against %s%s", 1524 full ? "": "suffix ", match); 1525 1526 ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL); 1527 1528 for (j = 0; ext && j < sk_GENERAL_NAME_num(ext); j++) { 1529 gen = sk_GENERAL_NAME_value(ext, j); 1530 if (gen->type != GEN_DNS) 1531 continue; 1532 dns_name++; 1533 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate dNSName", 1534 gen->d.dNSName->data, 1535 gen->d.dNSName->length); 1536 if (domain_suffix_match(gen->d.dNSName->data, 1537 gen->d.dNSName->length, match, full) == 1538 1) { 1539 wpa_printf(MSG_DEBUG, "TLS: %s in dNSName found", 1540 full ? "Match" : "Suffix match"); 1541 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free); 1542 return 1; 1543 } 1544 } 1545 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free); 1546 1547 if (dns_name) { 1548 wpa_printf(MSG_DEBUG, "TLS: None of the dNSName(s) matched"); 1549 return 0; 1550 } 1551 1552 name = X509_get_subject_name(cert); 1553 i = -1; 1554 for (;;) { 1555 X509_NAME_ENTRY *e; 1556 ASN1_STRING *cn; 1557 1558 i = X509_NAME_get_index_by_NID(name, NID_commonName, i); 1559 if (i == -1) 1560 break; 1561 e = X509_NAME_get_entry(name, i); 1562 if (e == NULL) 1563 continue; 1564 cn = X509_NAME_ENTRY_get_data(e); 1565 if (cn == NULL) 1566 continue; 1567 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate commonName", 1568 cn->data, cn->length); 1569 if (domain_suffix_match(cn->data, cn->length, match, full) == 1) 1570 { 1571 wpa_printf(MSG_DEBUG, "TLS: %s in commonName found", 1572 full ? "Match" : "Suffix match"); 1573 return 1; 1574 } 1575 } 1576 1577 wpa_printf(MSG_DEBUG, "TLS: No CommonName %smatch found", 1578 full ? "": "suffix "); 1579 return 0; 1580 #endif /* CONFIG_NATIVE_WINDOWS */ 1581 } 1582 1583 1584 static enum tls_fail_reason openssl_tls_fail_reason(int err) 1585 { 1586 switch (err) { 1587 case X509_V_ERR_CERT_REVOKED: 1588 return TLS_FAIL_REVOKED; 1589 case X509_V_ERR_CERT_NOT_YET_VALID: 1590 case X509_V_ERR_CRL_NOT_YET_VALID: 1591 return TLS_FAIL_NOT_YET_VALID; 1592 case X509_V_ERR_CERT_HAS_EXPIRED: 1593 case X509_V_ERR_CRL_HAS_EXPIRED: 1594 return TLS_FAIL_EXPIRED; 1595 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: 1596 case X509_V_ERR_UNABLE_TO_GET_CRL: 1597 case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: 1598 case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: 1599 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: 1600 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: 1601 case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: 1602 case X509_V_ERR_CERT_CHAIN_TOO_LONG: 1603 case X509_V_ERR_PATH_LENGTH_EXCEEDED: 1604 case X509_V_ERR_INVALID_CA: 1605 return TLS_FAIL_UNTRUSTED; 1606 case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: 1607 case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: 1608 case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: 1609 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: 1610 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: 1611 case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: 1612 case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: 1613 case X509_V_ERR_CERT_UNTRUSTED: 1614 case X509_V_ERR_CERT_REJECTED: 1615 return TLS_FAIL_BAD_CERTIFICATE; 1616 default: 1617 return TLS_FAIL_UNSPECIFIED; 1618 } 1619 } 1620 1621 1622 static struct wpabuf * get_x509_cert(X509 *cert) 1623 { 1624 struct wpabuf *buf; 1625 u8 *tmp; 1626 1627 int cert_len = i2d_X509(cert, NULL); 1628 if (cert_len <= 0) 1629 return NULL; 1630 1631 buf = wpabuf_alloc(cert_len); 1632 if (buf == NULL) 1633 return NULL; 1634 1635 tmp = wpabuf_put(buf, cert_len); 1636 i2d_X509(cert, &tmp); 1637 return buf; 1638 } 1639 1640 1641 static void openssl_tls_fail_event(struct tls_connection *conn, 1642 X509 *err_cert, int err, int depth, 1643 const char *subject, const char *err_str, 1644 enum tls_fail_reason reason) 1645 { 1646 union tls_event_data ev; 1647 struct wpabuf *cert = NULL; 1648 struct tls_context *context = conn->context; 1649 1650 if (context->event_cb == NULL) 1651 return; 1652 1653 cert = get_x509_cert(err_cert); 1654 os_memset(&ev, 0, sizeof(ev)); 1655 ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ? 1656 reason : openssl_tls_fail_reason(err); 1657 ev.cert_fail.depth = depth; 1658 ev.cert_fail.subject = subject; 1659 ev.cert_fail.reason_txt = err_str; 1660 ev.cert_fail.cert = cert; 1661 context->event_cb(context->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev); 1662 wpabuf_free(cert); 1663 } 1664 1665 1666 static void openssl_tls_cert_event(struct tls_connection *conn, 1667 X509 *err_cert, int depth, 1668 const char *subject) 1669 { 1670 struct wpabuf *cert = NULL; 1671 union tls_event_data ev; 1672 struct tls_context *context = conn->context; 1673 char *altsubject[TLS_MAX_ALT_SUBJECT]; 1674 int alt, num_altsubject = 0; 1675 GENERAL_NAME *gen; 1676 void *ext; 1677 stack_index_t i; 1678 #ifdef CONFIG_SHA256 1679 u8 hash[32]; 1680 #endif /* CONFIG_SHA256 */ 1681 1682 if (context->event_cb == NULL) 1683 return; 1684 1685 os_memset(&ev, 0, sizeof(ev)); 1686 if (conn->cert_probe || (conn->flags & TLS_CONN_EXT_CERT_CHECK) || 1687 context->cert_in_cb) { 1688 cert = get_x509_cert(err_cert); 1689 ev.peer_cert.cert = cert; 1690 } 1691 #ifdef CONFIG_SHA256 1692 if (cert) { 1693 const u8 *addr[1]; 1694 size_t len[1]; 1695 addr[0] = wpabuf_head(cert); 1696 len[0] = wpabuf_len(cert); 1697 if (sha256_vector(1, addr, len, hash) == 0) { 1698 ev.peer_cert.hash = hash; 1699 ev.peer_cert.hash_len = sizeof(hash); 1700 } 1701 } 1702 #endif /* CONFIG_SHA256 */ 1703 ev.peer_cert.depth = depth; 1704 ev.peer_cert.subject = subject; 1705 1706 ext = X509_get_ext_d2i(err_cert, NID_subject_alt_name, NULL, NULL); 1707 for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) { 1708 char *pos; 1709 1710 if (num_altsubject == TLS_MAX_ALT_SUBJECT) 1711 break; 1712 gen = sk_GENERAL_NAME_value(ext, i); 1713 if (gen->type != GEN_EMAIL && 1714 gen->type != GEN_DNS && 1715 gen->type != GEN_URI) 1716 continue; 1717 1718 pos = os_malloc(10 + gen->d.ia5->length + 1); 1719 if (pos == NULL) 1720 break; 1721 altsubject[num_altsubject++] = pos; 1722 1723 switch (gen->type) { 1724 case GEN_EMAIL: 1725 os_memcpy(pos, "EMAIL:", 6); 1726 pos += 6; 1727 break; 1728 case GEN_DNS: 1729 os_memcpy(pos, "DNS:", 4); 1730 pos += 4; 1731 break; 1732 case GEN_URI: 1733 os_memcpy(pos, "URI:", 4); 1734 pos += 4; 1735 break; 1736 } 1737 1738 os_memcpy(pos, gen->d.ia5->data, gen->d.ia5->length); 1739 pos += gen->d.ia5->length; 1740 *pos = '\0'; 1741 } 1742 sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free); 1743 1744 for (alt = 0; alt < num_altsubject; alt++) 1745 ev.peer_cert.altsubject[alt] = altsubject[alt]; 1746 ev.peer_cert.num_altsubject = num_altsubject; 1747 1748 context->event_cb(context->cb_ctx, TLS_PEER_CERTIFICATE, &ev); 1749 wpabuf_free(cert); 1750 for (alt = 0; alt < num_altsubject; alt++) 1751 os_free(altsubject[alt]); 1752 } 1753 1754 1755 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx) 1756 { 1757 char buf[256]; 1758 X509 *err_cert; 1759 int err, depth; 1760 SSL *ssl; 1761 struct tls_connection *conn; 1762 struct tls_context *context; 1763 char *match, *altmatch, *suffix_match, *domain_match; 1764 const char *err_str; 1765 1766 err_cert = X509_STORE_CTX_get_current_cert(x509_ctx); 1767 if (!err_cert) 1768 return 0; 1769 1770 err = X509_STORE_CTX_get_error(x509_ctx); 1771 depth = X509_STORE_CTX_get_error_depth(x509_ctx); 1772 ssl = X509_STORE_CTX_get_ex_data(x509_ctx, 1773 SSL_get_ex_data_X509_STORE_CTX_idx()); 1774 X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf)); 1775 1776 conn = SSL_get_app_data(ssl); 1777 if (conn == NULL) 1778 return 0; 1779 1780 if (depth == 0) 1781 conn->peer_cert = err_cert; 1782 else if (depth == 1) 1783 conn->peer_issuer = err_cert; 1784 else if (depth == 2) 1785 conn->peer_issuer_issuer = err_cert; 1786 1787 context = conn->context; 1788 match = conn->subject_match; 1789 altmatch = conn->altsubject_match; 1790 suffix_match = conn->suffix_match; 1791 domain_match = conn->domain_match; 1792 1793 if (!preverify_ok && !conn->ca_cert_verify) 1794 preverify_ok = 1; 1795 if (!preverify_ok && depth > 0 && conn->server_cert_only) 1796 preverify_ok = 1; 1797 if (!preverify_ok && (conn->flags & TLS_CONN_DISABLE_TIME_CHECKS) && 1798 (err == X509_V_ERR_CERT_HAS_EXPIRED || 1799 err == X509_V_ERR_CERT_NOT_YET_VALID)) { 1800 wpa_printf(MSG_DEBUG, "OpenSSL: Ignore certificate validity " 1801 "time mismatch"); 1802 preverify_ok = 1; 1803 } 1804 1805 err_str = X509_verify_cert_error_string(err); 1806 1807 #ifdef CONFIG_SHA256 1808 /* 1809 * Do not require preverify_ok so we can explicity allow otherwise 1810 * invalid pinned server certificates. 1811 */ 1812 if (depth == 0 && conn->server_cert_only) { 1813 struct wpabuf *cert; 1814 cert = get_x509_cert(err_cert); 1815 if (!cert) { 1816 wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch " 1817 "server certificate data"); 1818 preverify_ok = 0; 1819 } else { 1820 u8 hash[32]; 1821 const u8 *addr[1]; 1822 size_t len[1]; 1823 addr[0] = wpabuf_head(cert); 1824 len[0] = wpabuf_len(cert); 1825 if (sha256_vector(1, addr, len, hash) < 0 || 1826 os_memcmp(conn->srv_cert_hash, hash, 32) != 0) { 1827 err_str = "Server certificate mismatch"; 1828 err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN; 1829 preverify_ok = 0; 1830 } else if (!preverify_ok) { 1831 /* 1832 * Certificate matches pinned certificate, allow 1833 * regardless of other problems. 1834 */ 1835 wpa_printf(MSG_DEBUG, 1836 "OpenSSL: Ignore validation issues for a pinned server certificate"); 1837 preverify_ok = 1; 1838 } 1839 wpabuf_free(cert); 1840 } 1841 } 1842 #endif /* CONFIG_SHA256 */ 1843 1844 if (!preverify_ok) { 1845 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed," 1846 " error %d (%s) depth %d for '%s'", err, err_str, 1847 depth, buf); 1848 openssl_tls_fail_event(conn, err_cert, err, depth, buf, 1849 err_str, TLS_FAIL_UNSPECIFIED); 1850 return preverify_ok; 1851 } 1852 1853 wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d " 1854 "err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'", 1855 preverify_ok, err, err_str, 1856 conn->ca_cert_verify, depth, buf); 1857 if (depth == 0 && match && os_strstr(buf, match) == NULL) { 1858 wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not " 1859 "match with '%s'", buf, match); 1860 preverify_ok = 0; 1861 openssl_tls_fail_event(conn, err_cert, err, depth, buf, 1862 "Subject mismatch", 1863 TLS_FAIL_SUBJECT_MISMATCH); 1864 } else if (depth == 0 && altmatch && 1865 !tls_match_altsubject(err_cert, altmatch)) { 1866 wpa_printf(MSG_WARNING, "TLS: altSubjectName match " 1867 "'%s' not found", altmatch); 1868 preverify_ok = 0; 1869 openssl_tls_fail_event(conn, err_cert, err, depth, buf, 1870 "AltSubject mismatch", 1871 TLS_FAIL_ALTSUBJECT_MISMATCH); 1872 } else if (depth == 0 && suffix_match && 1873 !tls_match_suffix(err_cert, suffix_match, 0)) { 1874 wpa_printf(MSG_WARNING, "TLS: Domain suffix match '%s' not found", 1875 suffix_match); 1876 preverify_ok = 0; 1877 openssl_tls_fail_event(conn, err_cert, err, depth, buf, 1878 "Domain suffix mismatch", 1879 TLS_FAIL_DOMAIN_SUFFIX_MISMATCH); 1880 } else if (depth == 0 && domain_match && 1881 !tls_match_suffix(err_cert, domain_match, 1)) { 1882 wpa_printf(MSG_WARNING, "TLS: Domain match '%s' not found", 1883 domain_match); 1884 preverify_ok = 0; 1885 openssl_tls_fail_event(conn, err_cert, err, depth, buf, 1886 "Domain mismatch", 1887 TLS_FAIL_DOMAIN_MISMATCH); 1888 } else 1889 openssl_tls_cert_event(conn, err_cert, depth, buf); 1890 1891 if (conn->cert_probe && preverify_ok && depth == 0) { 1892 wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate " 1893 "on probe-only run"); 1894 preverify_ok = 0; 1895 openssl_tls_fail_event(conn, err_cert, err, depth, buf, 1896 "Server certificate chain probe", 1897 TLS_FAIL_SERVER_CHAIN_PROBE); 1898 } 1899 1900 #ifdef OPENSSL_IS_BORINGSSL 1901 if (depth == 0 && (conn->flags & TLS_CONN_REQUEST_OCSP) && 1902 preverify_ok) { 1903 enum ocsp_result res; 1904 1905 res = check_ocsp_resp(conn->ssl_ctx, conn->ssl, err_cert, 1906 conn->peer_issuer, 1907 conn->peer_issuer_issuer); 1908 if (res == OCSP_REVOKED) { 1909 preverify_ok = 0; 1910 openssl_tls_fail_event(conn, err_cert, err, depth, buf, 1911 "certificate revoked", 1912 TLS_FAIL_REVOKED); 1913 if (err == X509_V_OK) 1914 X509_STORE_CTX_set_error( 1915 x509_ctx, X509_V_ERR_CERT_REVOKED); 1916 } else if (res != OCSP_GOOD && 1917 (conn->flags & TLS_CONN_REQUIRE_OCSP)) { 1918 preverify_ok = 0; 1919 openssl_tls_fail_event(conn, err_cert, err, depth, buf, 1920 "bad certificate status response", 1921 TLS_FAIL_UNSPECIFIED); 1922 } 1923 } 1924 #endif /* OPENSSL_IS_BORINGSSL */ 1925 1926 if (depth == 0 && preverify_ok && context->event_cb != NULL) 1927 context->event_cb(context->cb_ctx, 1928 TLS_CERT_CHAIN_SUCCESS, NULL); 1929 1930 return preverify_ok; 1931 } 1932 1933 1934 #ifndef OPENSSL_NO_STDIO 1935 static int tls_load_ca_der(struct tls_data *data, const char *ca_cert) 1936 { 1937 SSL_CTX *ssl_ctx = data->ssl; 1938 X509_LOOKUP *lookup; 1939 int ret = 0; 1940 1941 lookup = X509_STORE_add_lookup(SSL_CTX_get_cert_store(ssl_ctx), 1942 X509_LOOKUP_file()); 1943 if (lookup == NULL) { 1944 tls_show_errors(MSG_WARNING, __func__, 1945 "Failed add lookup for X509 store"); 1946 return -1; 1947 } 1948 1949 if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) { 1950 unsigned long err = ERR_peek_error(); 1951 tls_show_errors(MSG_WARNING, __func__, 1952 "Failed load CA in DER format"); 1953 if (ERR_GET_LIB(err) == ERR_LIB_X509 && 1954 ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) { 1955 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring " 1956 "cert already in hash table error", 1957 __func__); 1958 } else 1959 ret = -1; 1960 } 1961 1962 return ret; 1963 } 1964 #endif /* OPENSSL_NO_STDIO */ 1965 1966 1967 static int tls_connection_ca_cert(struct tls_data *data, 1968 struct tls_connection *conn, 1969 const char *ca_cert, const u8 *ca_cert_blob, 1970 size_t ca_cert_blob_len, const char *ca_path) 1971 { 1972 SSL_CTX *ssl_ctx = data->ssl; 1973 X509_STORE *store; 1974 1975 /* 1976 * Remove previously configured trusted CA certificates before adding 1977 * new ones. 1978 */ 1979 store = X509_STORE_new(); 1980 if (store == NULL) { 1981 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new " 1982 "certificate store", __func__); 1983 return -1; 1984 } 1985 SSL_CTX_set_cert_store(ssl_ctx, store); 1986 1987 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb); 1988 conn->ca_cert_verify = 1; 1989 1990 if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) { 1991 wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate " 1992 "chain"); 1993 conn->cert_probe = 1; 1994 conn->ca_cert_verify = 0; 1995 return 0; 1996 } 1997 1998 if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) { 1999 #ifdef CONFIG_SHA256 2000 const char *pos = ca_cert + 7; 2001 if (os_strncmp(pos, "server/sha256/", 14) != 0) { 2002 wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert " 2003 "hash value '%s'", ca_cert); 2004 return -1; 2005 } 2006 pos += 14; 2007 if (os_strlen(pos) != 32 * 2) { 2008 wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 " 2009 "hash length in ca_cert '%s'", ca_cert); 2010 return -1; 2011 } 2012 if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) { 2013 wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash " 2014 "value in ca_cert '%s'", ca_cert); 2015 return -1; 2016 } 2017 conn->server_cert_only = 1; 2018 wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server " 2019 "certificate match"); 2020 return 0; 2021 #else /* CONFIG_SHA256 */ 2022 wpa_printf(MSG_INFO, "No SHA256 included in the build - " 2023 "cannot validate server certificate hash"); 2024 return -1; 2025 #endif /* CONFIG_SHA256 */ 2026 } 2027 2028 if (ca_cert_blob) { 2029 X509 *cert = d2i_X509(NULL, 2030 (const unsigned char **) &ca_cert_blob, 2031 ca_cert_blob_len); 2032 if (cert == NULL) { 2033 tls_show_errors(MSG_WARNING, __func__, 2034 "Failed to parse ca_cert_blob"); 2035 return -1; 2036 } 2037 2038 if (!X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx), 2039 cert)) { 2040 unsigned long err = ERR_peek_error(); 2041 tls_show_errors(MSG_WARNING, __func__, 2042 "Failed to add ca_cert_blob to " 2043 "certificate store"); 2044 if (ERR_GET_LIB(err) == ERR_LIB_X509 && 2045 ERR_GET_REASON(err) == 2046 X509_R_CERT_ALREADY_IN_HASH_TABLE) { 2047 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring " 2048 "cert already in hash table error", 2049 __func__); 2050 } else { 2051 X509_free(cert); 2052 return -1; 2053 } 2054 } 2055 X509_free(cert); 2056 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob " 2057 "to certificate store", __func__); 2058 return 0; 2059 } 2060 2061 #ifdef ANDROID 2062 /* Single alias */ 2063 if (ca_cert && os_strncmp("keystore://", ca_cert, 11) == 0) { 2064 if (tls_add_ca_from_keystore(ssl_ctx->cert_store, 2065 &ca_cert[11]) < 0) 2066 return -1; 2067 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb); 2068 return 0; 2069 } 2070 2071 /* Multiple aliases separated by space */ 2072 if (ca_cert && os_strncmp("keystores://", ca_cert, 12) == 0) { 2073 char *aliases = os_strdup(&ca_cert[12]); 2074 const char *delim = " "; 2075 int rc = 0; 2076 char *savedptr; 2077 char *alias; 2078 2079 if (!aliases) 2080 return -1; 2081 alias = strtok_r(aliases, delim, &savedptr); 2082 for (; alias; alias = strtok_r(NULL, delim, &savedptr)) { 2083 if (tls_add_ca_from_keystore_encoded( 2084 ssl_ctx->cert_store, alias)) { 2085 wpa_printf(MSG_WARNING, 2086 "OpenSSL: %s - Failed to add ca_cert %s from keystore", 2087 __func__, alias); 2088 rc = -1; 2089 break; 2090 } 2091 } 2092 os_free(aliases); 2093 if (rc) 2094 return rc; 2095 2096 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb); 2097 return 0; 2098 } 2099 #endif /* ANDROID */ 2100 2101 #ifdef CONFIG_NATIVE_WINDOWS 2102 if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) == 2103 0) { 2104 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from " 2105 "system certificate store"); 2106 return 0; 2107 } 2108 #endif /* CONFIG_NATIVE_WINDOWS */ 2109 2110 if (ca_cert || ca_path) { 2111 #ifndef OPENSSL_NO_STDIO 2112 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) != 2113 1) { 2114 tls_show_errors(MSG_WARNING, __func__, 2115 "Failed to load root certificates"); 2116 if (ca_cert && 2117 tls_load_ca_der(data, ca_cert) == 0) { 2118 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded " 2119 "DER format CA certificate", 2120 __func__); 2121 } else 2122 return -1; 2123 } else { 2124 wpa_printf(MSG_DEBUG, "TLS: Trusted root " 2125 "certificate(s) loaded"); 2126 tls_get_errors(data); 2127 } 2128 #else /* OPENSSL_NO_STDIO */ 2129 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", 2130 __func__); 2131 return -1; 2132 #endif /* OPENSSL_NO_STDIO */ 2133 } else { 2134 /* No ca_cert configured - do not try to verify server 2135 * certificate */ 2136 conn->ca_cert_verify = 0; 2137 } 2138 2139 return 0; 2140 } 2141 2142 2143 static int tls_global_ca_cert(struct tls_data *data, const char *ca_cert) 2144 { 2145 SSL_CTX *ssl_ctx = data->ssl; 2146 2147 if (ca_cert) { 2148 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1) 2149 { 2150 tls_show_errors(MSG_WARNING, __func__, 2151 "Failed to load root certificates"); 2152 return -1; 2153 } 2154 2155 wpa_printf(MSG_DEBUG, "TLS: Trusted root " 2156 "certificate(s) loaded"); 2157 2158 #ifndef OPENSSL_NO_STDIO 2159 /* Add the same CAs to the client certificate requests */ 2160 SSL_CTX_set_client_CA_list(ssl_ctx, 2161 SSL_load_client_CA_file(ca_cert)); 2162 #endif /* OPENSSL_NO_STDIO */ 2163 } 2164 2165 return 0; 2166 } 2167 2168 2169 int tls_global_set_verify(void *ssl_ctx, int check_crl) 2170 { 2171 int flags; 2172 2173 if (check_crl) { 2174 struct tls_data *data = ssl_ctx; 2175 X509_STORE *cs = SSL_CTX_get_cert_store(data->ssl); 2176 if (cs == NULL) { 2177 tls_show_errors(MSG_INFO, __func__, "Failed to get " 2178 "certificate store when enabling " 2179 "check_crl"); 2180 return -1; 2181 } 2182 flags = X509_V_FLAG_CRL_CHECK; 2183 if (check_crl == 2) 2184 flags |= X509_V_FLAG_CRL_CHECK_ALL; 2185 X509_STORE_set_flags(cs, flags); 2186 } 2187 return 0; 2188 } 2189 2190 2191 static int tls_connection_set_subject_match(struct tls_connection *conn, 2192 const char *subject_match, 2193 const char *altsubject_match, 2194 const char *suffix_match, 2195 const char *domain_match) 2196 { 2197 os_free(conn->subject_match); 2198 conn->subject_match = NULL; 2199 if (subject_match) { 2200 conn->subject_match = os_strdup(subject_match); 2201 if (conn->subject_match == NULL) 2202 return -1; 2203 } 2204 2205 os_free(conn->altsubject_match); 2206 conn->altsubject_match = NULL; 2207 if (altsubject_match) { 2208 conn->altsubject_match = os_strdup(altsubject_match); 2209 if (conn->altsubject_match == NULL) 2210 return -1; 2211 } 2212 2213 os_free(conn->suffix_match); 2214 conn->suffix_match = NULL; 2215 if (suffix_match) { 2216 conn->suffix_match = os_strdup(suffix_match); 2217 if (conn->suffix_match == NULL) 2218 return -1; 2219 } 2220 2221 os_free(conn->domain_match); 2222 conn->domain_match = NULL; 2223 if (domain_match) { 2224 conn->domain_match = os_strdup(domain_match); 2225 if (conn->domain_match == NULL) 2226 return -1; 2227 } 2228 2229 return 0; 2230 } 2231 2232 2233 static void tls_set_conn_flags(SSL *ssl, unsigned int flags) 2234 { 2235 #ifdef SSL_OP_NO_TICKET 2236 if (flags & TLS_CONN_DISABLE_SESSION_TICKET) 2237 SSL_set_options(ssl, SSL_OP_NO_TICKET); 2238 #ifdef SSL_clear_options 2239 else 2240 SSL_clear_options(ssl, SSL_OP_NO_TICKET); 2241 #endif /* SSL_clear_options */ 2242 #endif /* SSL_OP_NO_TICKET */ 2243 2244 #ifdef SSL_OP_NO_TLSv1 2245 if (flags & TLS_CONN_DISABLE_TLSv1_0) 2246 SSL_set_options(ssl, SSL_OP_NO_TLSv1); 2247 else 2248 SSL_clear_options(ssl, SSL_OP_NO_TLSv1); 2249 #endif /* SSL_OP_NO_TLSv1 */ 2250 #ifdef SSL_OP_NO_TLSv1_1 2251 if (flags & TLS_CONN_DISABLE_TLSv1_1) 2252 SSL_set_options(ssl, SSL_OP_NO_TLSv1_1); 2253 else 2254 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_1); 2255 #endif /* SSL_OP_NO_TLSv1_1 */ 2256 #ifdef SSL_OP_NO_TLSv1_2 2257 if (flags & TLS_CONN_DISABLE_TLSv1_2) 2258 SSL_set_options(ssl, SSL_OP_NO_TLSv1_2); 2259 else 2260 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_2); 2261 #endif /* SSL_OP_NO_TLSv1_2 */ 2262 } 2263 2264 2265 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn, 2266 int verify_peer, unsigned int flags, 2267 const u8 *session_ctx, size_t session_ctx_len) 2268 { 2269 static int counter = 0; 2270 struct tls_data *data = ssl_ctx; 2271 2272 if (conn == NULL) 2273 return -1; 2274 2275 if (verify_peer) { 2276 conn->ca_cert_verify = 1; 2277 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER | 2278 SSL_VERIFY_FAIL_IF_NO_PEER_CERT | 2279 SSL_VERIFY_CLIENT_ONCE, tls_verify_cb); 2280 } else { 2281 conn->ca_cert_verify = 0; 2282 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL); 2283 } 2284 2285 tls_set_conn_flags(conn->ssl, flags); 2286 conn->flags = flags; 2287 2288 SSL_set_accept_state(conn->ssl); 2289 2290 if (data->tls_session_lifetime == 0) { 2291 /* 2292 * Set session id context to a unique value to make sure 2293 * session resumption cannot be used either through session 2294 * caching or TLS ticket extension. 2295 */ 2296 counter++; 2297 SSL_set_session_id_context(conn->ssl, 2298 (const unsigned char *) &counter, 2299 sizeof(counter)); 2300 } else if (session_ctx) { 2301 SSL_set_session_id_context(conn->ssl, session_ctx, 2302 session_ctx_len); 2303 } 2304 2305 return 0; 2306 } 2307 2308 2309 static int tls_connection_client_cert(struct tls_connection *conn, 2310 const char *client_cert, 2311 const u8 *client_cert_blob, 2312 size_t client_cert_blob_len) 2313 { 2314 if (client_cert == NULL && client_cert_blob == NULL) 2315 return 0; 2316 2317 #ifdef PKCS12_FUNCS 2318 #if OPENSSL_VERSION_NUMBER < 0x10002000L 2319 /* 2320 * Clear previously set extra chain certificates, if any, from PKCS#12 2321 * processing in tls_parse_pkcs12() to allow OpenSSL to build a new 2322 * chain properly. 2323 */ 2324 SSL_CTX_clear_extra_chain_certs(conn->ssl_ctx); 2325 #endif /* OPENSSL_VERSION_NUMBER < 0x10002000L */ 2326 #endif /* PKCS12_FUNCS */ 2327 2328 if (client_cert_blob && 2329 SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob, 2330 client_cert_blob_len) == 1) { 2331 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> " 2332 "OK"); 2333 return 0; 2334 } else if (client_cert_blob) { 2335 tls_show_errors(MSG_DEBUG, __func__, 2336 "SSL_use_certificate_ASN1 failed"); 2337 } 2338 2339 if (client_cert == NULL) 2340 return -1; 2341 2342 #ifdef ANDROID 2343 if (os_strncmp("keystore://", client_cert, 11) == 0) { 2344 BIO *bio = BIO_from_keystore(&client_cert[11]); 2345 X509 *x509 = NULL; 2346 int ret = -1; 2347 if (bio) { 2348 x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL); 2349 BIO_free(bio); 2350 } 2351 if (x509) { 2352 if (SSL_use_certificate(conn->ssl, x509) == 1) 2353 ret = 0; 2354 X509_free(x509); 2355 } 2356 return ret; 2357 } 2358 #endif /* ANDROID */ 2359 2360 #ifndef OPENSSL_NO_STDIO 2361 if (SSL_use_certificate_file(conn->ssl, client_cert, 2362 SSL_FILETYPE_ASN1) == 1) { 2363 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)" 2364 " --> OK"); 2365 return 0; 2366 } 2367 2368 if (SSL_use_certificate_file(conn->ssl, client_cert, 2369 SSL_FILETYPE_PEM) == 1) { 2370 ERR_clear_error(); 2371 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)" 2372 " --> OK"); 2373 return 0; 2374 } 2375 2376 tls_show_errors(MSG_DEBUG, __func__, 2377 "SSL_use_certificate_file failed"); 2378 #else /* OPENSSL_NO_STDIO */ 2379 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__); 2380 #endif /* OPENSSL_NO_STDIO */ 2381 2382 return -1; 2383 } 2384 2385 2386 static int tls_global_client_cert(struct tls_data *data, 2387 const char *client_cert) 2388 { 2389 #ifndef OPENSSL_NO_STDIO 2390 SSL_CTX *ssl_ctx = data->ssl; 2391 2392 if (client_cert == NULL) 2393 return 0; 2394 2395 if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert, 2396 SSL_FILETYPE_ASN1) != 1 && 2397 SSL_CTX_use_certificate_chain_file(ssl_ctx, client_cert) != 1 && 2398 SSL_CTX_use_certificate_file(ssl_ctx, client_cert, 2399 SSL_FILETYPE_PEM) != 1) { 2400 tls_show_errors(MSG_INFO, __func__, 2401 "Failed to load client certificate"); 2402 return -1; 2403 } 2404 return 0; 2405 #else /* OPENSSL_NO_STDIO */ 2406 if (client_cert == NULL) 2407 return 0; 2408 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__); 2409 return -1; 2410 #endif /* OPENSSL_NO_STDIO */ 2411 } 2412 2413 2414 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password) 2415 { 2416 if (password == NULL) { 2417 return 0; 2418 } 2419 os_strlcpy(buf, (char *) password, size); 2420 return os_strlen(buf); 2421 } 2422 2423 2424 #ifdef PKCS12_FUNCS 2425 static int tls_parse_pkcs12(struct tls_data *data, SSL *ssl, PKCS12 *p12, 2426 const char *passwd) 2427 { 2428 EVP_PKEY *pkey; 2429 X509 *cert; 2430 STACK_OF(X509) *certs; 2431 int res = 0; 2432 char buf[256]; 2433 2434 pkey = NULL; 2435 cert = NULL; 2436 certs = NULL; 2437 if (!passwd) 2438 passwd = ""; 2439 if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) { 2440 tls_show_errors(MSG_DEBUG, __func__, 2441 "Failed to parse PKCS12 file"); 2442 PKCS12_free(p12); 2443 return -1; 2444 } 2445 wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data"); 2446 2447 if (cert) { 2448 X509_NAME_oneline(X509_get_subject_name(cert), buf, 2449 sizeof(buf)); 2450 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: " 2451 "subject='%s'", buf); 2452 if (ssl) { 2453 if (SSL_use_certificate(ssl, cert) != 1) 2454 res = -1; 2455 } else { 2456 if (SSL_CTX_use_certificate(data->ssl, cert) != 1) 2457 res = -1; 2458 } 2459 X509_free(cert); 2460 } 2461 2462 if (pkey) { 2463 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12"); 2464 if (ssl) { 2465 if (SSL_use_PrivateKey(ssl, pkey) != 1) 2466 res = -1; 2467 } else { 2468 if (SSL_CTX_use_PrivateKey(data->ssl, pkey) != 1) 2469 res = -1; 2470 } 2471 EVP_PKEY_free(pkey); 2472 } 2473 2474 if (certs) { 2475 #if OPENSSL_VERSION_NUMBER >= 0x10002000L && !defined(LIBRESSL_VERSION_NUMBER) 2476 if (ssl) 2477 SSL_clear_chain_certs(ssl); 2478 else 2479 SSL_CTX_clear_chain_certs(data->ssl); 2480 while ((cert = sk_X509_pop(certs)) != NULL) { 2481 X509_NAME_oneline(X509_get_subject_name(cert), buf, 2482 sizeof(buf)); 2483 wpa_printf(MSG_DEBUG, "TLS: additional certificate" 2484 " from PKCS12: subject='%s'", buf); 2485 if ((ssl && SSL_add1_chain_cert(ssl, cert) != 1) || 2486 (!ssl && SSL_CTX_add1_chain_cert(data->ssl, 2487 cert) != 1)) { 2488 tls_show_errors(MSG_DEBUG, __func__, 2489 "Failed to add additional certificate"); 2490 res = -1; 2491 X509_free(cert); 2492 break; 2493 } 2494 X509_free(cert); 2495 } 2496 if (!res) { 2497 /* Try to continue anyway */ 2498 } 2499 sk_X509_pop_free(certs, X509_free); 2500 #ifndef OPENSSL_IS_BORINGSSL 2501 if (ssl) 2502 res = SSL_build_cert_chain( 2503 ssl, 2504 SSL_BUILD_CHAIN_FLAG_CHECK | 2505 SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR); 2506 else 2507 res = SSL_CTX_build_cert_chain( 2508 data->ssl, 2509 SSL_BUILD_CHAIN_FLAG_CHECK | 2510 SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR); 2511 if (!res) { 2512 tls_show_errors(MSG_DEBUG, __func__, 2513 "Failed to build certificate chain"); 2514 } else if (res == 2) { 2515 wpa_printf(MSG_DEBUG, 2516 "TLS: Ignore certificate chain verification error when building chain with PKCS#12 extra certificates"); 2517 } 2518 #endif /* OPENSSL_IS_BORINGSSL */ 2519 /* 2520 * Try to continue regardless of result since it is possible for 2521 * the extra certificates not to be required. 2522 */ 2523 res = 0; 2524 #else /* OPENSSL_VERSION_NUMBER >= 0x10002000L */ 2525 SSL_CTX_clear_extra_chain_certs(data->ssl); 2526 while ((cert = sk_X509_pop(certs)) != NULL) { 2527 X509_NAME_oneline(X509_get_subject_name(cert), buf, 2528 sizeof(buf)); 2529 wpa_printf(MSG_DEBUG, "TLS: additional certificate" 2530 " from PKCS12: subject='%s'", buf); 2531 /* 2532 * There is no SSL equivalent for the chain cert - so 2533 * always add it to the context... 2534 */ 2535 if (SSL_CTX_add_extra_chain_cert(data->ssl, cert) != 1) 2536 { 2537 X509_free(cert); 2538 res = -1; 2539 break; 2540 } 2541 } 2542 sk_X509_pop_free(certs, X509_free); 2543 #endif /* OPENSSL_VERSION_NUMBER >= 0x10002000L */ 2544 } 2545 2546 PKCS12_free(p12); 2547 2548 if (res < 0) 2549 tls_get_errors(data); 2550 2551 return res; 2552 } 2553 #endif /* PKCS12_FUNCS */ 2554 2555 2556 static int tls_read_pkcs12(struct tls_data *data, SSL *ssl, 2557 const char *private_key, const char *passwd) 2558 { 2559 #ifdef PKCS12_FUNCS 2560 FILE *f; 2561 PKCS12 *p12; 2562 2563 f = fopen(private_key, "rb"); 2564 if (f == NULL) 2565 return -1; 2566 2567 p12 = d2i_PKCS12_fp(f, NULL); 2568 fclose(f); 2569 2570 if (p12 == NULL) { 2571 tls_show_errors(MSG_INFO, __func__, 2572 "Failed to use PKCS#12 file"); 2573 return -1; 2574 } 2575 2576 return tls_parse_pkcs12(data, ssl, p12, passwd); 2577 2578 #else /* PKCS12_FUNCS */ 2579 wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read " 2580 "p12/pfx files"); 2581 return -1; 2582 #endif /* PKCS12_FUNCS */ 2583 } 2584 2585 2586 static int tls_read_pkcs12_blob(struct tls_data *data, SSL *ssl, 2587 const u8 *blob, size_t len, const char *passwd) 2588 { 2589 #ifdef PKCS12_FUNCS 2590 PKCS12 *p12; 2591 2592 p12 = d2i_PKCS12(NULL, (const unsigned char **) &blob, len); 2593 if (p12 == NULL) { 2594 tls_show_errors(MSG_INFO, __func__, 2595 "Failed to use PKCS#12 blob"); 2596 return -1; 2597 } 2598 2599 return tls_parse_pkcs12(data, ssl, p12, passwd); 2600 2601 #else /* PKCS12_FUNCS */ 2602 wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse " 2603 "p12/pfx blobs"); 2604 return -1; 2605 #endif /* PKCS12_FUNCS */ 2606 } 2607 2608 2609 #ifndef OPENSSL_NO_ENGINE 2610 static int tls_engine_get_cert(struct tls_connection *conn, 2611 const char *cert_id, 2612 X509 **cert) 2613 { 2614 /* this runs after the private key is loaded so no PIN is required */ 2615 struct { 2616 const char *cert_id; 2617 X509 *cert; 2618 } params; 2619 params.cert_id = cert_id; 2620 params.cert = NULL; 2621 2622 if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL", 2623 0, ¶ms, NULL, 1)) { 2624 unsigned long err = ERR_get_error(); 2625 2626 wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id" 2627 " '%s' [%s]", cert_id, 2628 ERR_error_string(err, NULL)); 2629 if (tls_is_pin_error(err)) 2630 return TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN; 2631 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED; 2632 } 2633 if (!params.cert) { 2634 wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id" 2635 " '%s'", cert_id); 2636 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED; 2637 } 2638 *cert = params.cert; 2639 return 0; 2640 } 2641 #endif /* OPENSSL_NO_ENGINE */ 2642 2643 2644 static int tls_connection_engine_client_cert(struct tls_connection *conn, 2645 const char *cert_id) 2646 { 2647 #ifndef OPENSSL_NO_ENGINE 2648 X509 *cert; 2649 2650 if (tls_engine_get_cert(conn, cert_id, &cert)) 2651 return -1; 2652 2653 if (!SSL_use_certificate(conn->ssl, cert)) { 2654 tls_show_errors(MSG_ERROR, __func__, 2655 "SSL_use_certificate failed"); 2656 X509_free(cert); 2657 return -1; 2658 } 2659 X509_free(cert); 2660 wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> " 2661 "OK"); 2662 return 0; 2663 2664 #else /* OPENSSL_NO_ENGINE */ 2665 return -1; 2666 #endif /* OPENSSL_NO_ENGINE */ 2667 } 2668 2669 2670 static int tls_connection_engine_ca_cert(struct tls_data *data, 2671 struct tls_connection *conn, 2672 const char *ca_cert_id) 2673 { 2674 #ifndef OPENSSL_NO_ENGINE 2675 X509 *cert; 2676 SSL_CTX *ssl_ctx = data->ssl; 2677 X509_STORE *store; 2678 2679 if (tls_engine_get_cert(conn, ca_cert_id, &cert)) 2680 return -1; 2681 2682 /* start off the same as tls_connection_ca_cert */ 2683 store = X509_STORE_new(); 2684 if (store == NULL) { 2685 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new " 2686 "certificate store", __func__); 2687 X509_free(cert); 2688 return -1; 2689 } 2690 SSL_CTX_set_cert_store(ssl_ctx, store); 2691 if (!X509_STORE_add_cert(store, cert)) { 2692 unsigned long err = ERR_peek_error(); 2693 tls_show_errors(MSG_WARNING, __func__, 2694 "Failed to add CA certificate from engine " 2695 "to certificate store"); 2696 if (ERR_GET_LIB(err) == ERR_LIB_X509 && 2697 ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) { 2698 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert" 2699 " already in hash table error", 2700 __func__); 2701 } else { 2702 X509_free(cert); 2703 return -1; 2704 } 2705 } 2706 X509_free(cert); 2707 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine " 2708 "to certificate store", __func__); 2709 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb); 2710 conn->ca_cert_verify = 1; 2711 2712 return 0; 2713 2714 #else /* OPENSSL_NO_ENGINE */ 2715 return -1; 2716 #endif /* OPENSSL_NO_ENGINE */ 2717 } 2718 2719 2720 static int tls_connection_engine_private_key(struct tls_connection *conn) 2721 { 2722 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE) 2723 if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) { 2724 tls_show_errors(MSG_ERROR, __func__, 2725 "ENGINE: cannot use private key for TLS"); 2726 return -1; 2727 } 2728 if (!SSL_check_private_key(conn->ssl)) { 2729 tls_show_errors(MSG_INFO, __func__, 2730 "Private key failed verification"); 2731 return -1; 2732 } 2733 return 0; 2734 #else /* OPENSSL_NO_ENGINE */ 2735 wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but " 2736 "engine support was not compiled in"); 2737 return -1; 2738 #endif /* OPENSSL_NO_ENGINE */ 2739 } 2740 2741 2742 static int tls_connection_private_key(struct tls_data *data, 2743 struct tls_connection *conn, 2744 const char *private_key, 2745 const char *private_key_passwd, 2746 const u8 *private_key_blob, 2747 size_t private_key_blob_len) 2748 { 2749 SSL_CTX *ssl_ctx = data->ssl; 2750 char *passwd; 2751 int ok; 2752 2753 if (private_key == NULL && private_key_blob == NULL) 2754 return 0; 2755 2756 if (private_key_passwd) { 2757 passwd = os_strdup(private_key_passwd); 2758 if (passwd == NULL) 2759 return -1; 2760 } else 2761 passwd = NULL; 2762 2763 SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb); 2764 SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd); 2765 2766 ok = 0; 2767 while (private_key_blob) { 2768 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl, 2769 (u8 *) private_key_blob, 2770 private_key_blob_len) == 1) { 2771 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_" 2772 "ASN1(EVP_PKEY_RSA) --> OK"); 2773 ok = 1; 2774 break; 2775 } 2776 2777 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl, 2778 (u8 *) private_key_blob, 2779 private_key_blob_len) == 1) { 2780 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_" 2781 "ASN1(EVP_PKEY_DSA) --> OK"); 2782 ok = 1; 2783 break; 2784 } 2785 2786 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl, 2787 (u8 *) private_key_blob, 2788 private_key_blob_len) == 1) { 2789 wpa_printf(MSG_DEBUG, "OpenSSL: " 2790 "SSL_use_RSAPrivateKey_ASN1 --> OK"); 2791 ok = 1; 2792 break; 2793 } 2794 2795 if (tls_read_pkcs12_blob(data, conn->ssl, private_key_blob, 2796 private_key_blob_len, passwd) == 0) { 2797 wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> " 2798 "OK"); 2799 ok = 1; 2800 break; 2801 } 2802 2803 break; 2804 } 2805 2806 while (!ok && private_key) { 2807 #ifndef OPENSSL_NO_STDIO 2808 if (SSL_use_PrivateKey_file(conn->ssl, private_key, 2809 SSL_FILETYPE_ASN1) == 1) { 2810 wpa_printf(MSG_DEBUG, "OpenSSL: " 2811 "SSL_use_PrivateKey_File (DER) --> OK"); 2812 ok = 1; 2813 break; 2814 } 2815 2816 if (SSL_use_PrivateKey_file(conn->ssl, private_key, 2817 SSL_FILETYPE_PEM) == 1) { 2818 wpa_printf(MSG_DEBUG, "OpenSSL: " 2819 "SSL_use_PrivateKey_File (PEM) --> OK"); 2820 ok = 1; 2821 break; 2822 } 2823 #else /* OPENSSL_NO_STDIO */ 2824 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", 2825 __func__); 2826 #endif /* OPENSSL_NO_STDIO */ 2827 2828 if (tls_read_pkcs12(data, conn->ssl, private_key, passwd) 2829 == 0) { 2830 wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file " 2831 "--> OK"); 2832 ok = 1; 2833 break; 2834 } 2835 2836 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) { 2837 wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to " 2838 "access certificate store --> OK"); 2839 ok = 1; 2840 break; 2841 } 2842 2843 break; 2844 } 2845 2846 if (!ok) { 2847 tls_show_errors(MSG_INFO, __func__, 2848 "Failed to load private key"); 2849 os_free(passwd); 2850 return -1; 2851 } 2852 ERR_clear_error(); 2853 SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL); 2854 os_free(passwd); 2855 2856 if (!SSL_check_private_key(conn->ssl)) { 2857 tls_show_errors(MSG_INFO, __func__, "Private key failed " 2858 "verification"); 2859 return -1; 2860 } 2861 2862 wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully"); 2863 return 0; 2864 } 2865 2866 2867 static int tls_global_private_key(struct tls_data *data, 2868 const char *private_key, 2869 const char *private_key_passwd) 2870 { 2871 SSL_CTX *ssl_ctx = data->ssl; 2872 char *passwd; 2873 2874 if (private_key == NULL) 2875 return 0; 2876 2877 if (private_key_passwd) { 2878 passwd = os_strdup(private_key_passwd); 2879 if (passwd == NULL) 2880 return -1; 2881 } else 2882 passwd = NULL; 2883 2884 SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb); 2885 SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd); 2886 if ( 2887 #ifndef OPENSSL_NO_STDIO 2888 SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key, 2889 SSL_FILETYPE_ASN1) != 1 && 2890 SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key, 2891 SSL_FILETYPE_PEM) != 1 && 2892 #endif /* OPENSSL_NO_STDIO */ 2893 tls_read_pkcs12(data, NULL, private_key, passwd)) { 2894 tls_show_errors(MSG_INFO, __func__, 2895 "Failed to load private key"); 2896 os_free(passwd); 2897 ERR_clear_error(); 2898 return -1; 2899 } 2900 os_free(passwd); 2901 ERR_clear_error(); 2902 SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL); 2903 2904 if (!SSL_CTX_check_private_key(ssl_ctx)) { 2905 tls_show_errors(MSG_INFO, __func__, 2906 "Private key failed verification"); 2907 return -1; 2908 } 2909 2910 return 0; 2911 } 2912 2913 2914 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file) 2915 { 2916 #ifdef OPENSSL_NO_DH 2917 if (dh_file == NULL) 2918 return 0; 2919 wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but " 2920 "dh_file specified"); 2921 return -1; 2922 #else /* OPENSSL_NO_DH */ 2923 DH *dh; 2924 BIO *bio; 2925 2926 /* TODO: add support for dh_blob */ 2927 if (dh_file == NULL) 2928 return 0; 2929 if (conn == NULL) 2930 return -1; 2931 2932 bio = BIO_new_file(dh_file, "r"); 2933 if (bio == NULL) { 2934 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s", 2935 dh_file, ERR_error_string(ERR_get_error(), NULL)); 2936 return -1; 2937 } 2938 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); 2939 BIO_free(bio); 2940 #ifndef OPENSSL_NO_DSA 2941 while (dh == NULL) { 2942 DSA *dsa; 2943 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -" 2944 " trying to parse as DSA params", dh_file, 2945 ERR_error_string(ERR_get_error(), NULL)); 2946 bio = BIO_new_file(dh_file, "r"); 2947 if (bio == NULL) 2948 break; 2949 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL); 2950 BIO_free(bio); 2951 if (!dsa) { 2952 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file " 2953 "'%s': %s", dh_file, 2954 ERR_error_string(ERR_get_error(), NULL)); 2955 break; 2956 } 2957 2958 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format"); 2959 dh = DSA_dup_DH(dsa); 2960 DSA_free(dsa); 2961 if (dh == NULL) { 2962 wpa_printf(MSG_INFO, "TLS: Failed to convert DSA " 2963 "params into DH params"); 2964 break; 2965 } 2966 break; 2967 } 2968 #endif /* !OPENSSL_NO_DSA */ 2969 if (dh == NULL) { 2970 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file " 2971 "'%s'", dh_file); 2972 return -1; 2973 } 2974 2975 if (SSL_set_tmp_dh(conn->ssl, dh) != 1) { 2976 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': " 2977 "%s", dh_file, 2978 ERR_error_string(ERR_get_error(), NULL)); 2979 DH_free(dh); 2980 return -1; 2981 } 2982 DH_free(dh); 2983 return 0; 2984 #endif /* OPENSSL_NO_DH */ 2985 } 2986 2987 2988 static int tls_global_dh(struct tls_data *data, const char *dh_file) 2989 { 2990 #ifdef OPENSSL_NO_DH 2991 if (dh_file == NULL) 2992 return 0; 2993 wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but " 2994 "dh_file specified"); 2995 return -1; 2996 #else /* OPENSSL_NO_DH */ 2997 SSL_CTX *ssl_ctx = data->ssl; 2998 DH *dh; 2999 BIO *bio; 3000 3001 /* TODO: add support for dh_blob */ 3002 if (dh_file == NULL) 3003 return 0; 3004 if (ssl_ctx == NULL) 3005 return -1; 3006 3007 bio = BIO_new_file(dh_file, "r"); 3008 if (bio == NULL) { 3009 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s", 3010 dh_file, ERR_error_string(ERR_get_error(), NULL)); 3011 return -1; 3012 } 3013 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); 3014 BIO_free(bio); 3015 #ifndef OPENSSL_NO_DSA 3016 while (dh == NULL) { 3017 DSA *dsa; 3018 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -" 3019 " trying to parse as DSA params", dh_file, 3020 ERR_error_string(ERR_get_error(), NULL)); 3021 bio = BIO_new_file(dh_file, "r"); 3022 if (bio == NULL) 3023 break; 3024 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL); 3025 BIO_free(bio); 3026 if (!dsa) { 3027 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file " 3028 "'%s': %s", dh_file, 3029 ERR_error_string(ERR_get_error(), NULL)); 3030 break; 3031 } 3032 3033 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format"); 3034 dh = DSA_dup_DH(dsa); 3035 DSA_free(dsa); 3036 if (dh == NULL) { 3037 wpa_printf(MSG_INFO, "TLS: Failed to convert DSA " 3038 "params into DH params"); 3039 break; 3040 } 3041 break; 3042 } 3043 #endif /* !OPENSSL_NO_DSA */ 3044 if (dh == NULL) { 3045 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file " 3046 "'%s'", dh_file); 3047 return -1; 3048 } 3049 3050 if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) { 3051 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': " 3052 "%s", dh_file, 3053 ERR_error_string(ERR_get_error(), NULL)); 3054 DH_free(dh); 3055 return -1; 3056 } 3057 DH_free(dh); 3058 return 0; 3059 #endif /* OPENSSL_NO_DH */ 3060 } 3061 3062 3063 int tls_connection_get_random(void *ssl_ctx, struct tls_connection *conn, 3064 struct tls_random *keys) 3065 { 3066 SSL *ssl; 3067 3068 if (conn == NULL || keys == NULL) 3069 return -1; 3070 ssl = conn->ssl; 3071 if (ssl == NULL) 3072 return -1; 3073 3074 os_memset(keys, 0, sizeof(*keys)); 3075 keys->client_random = conn->client_random; 3076 keys->client_random_len = SSL_get_client_random( 3077 ssl, conn->client_random, sizeof(conn->client_random)); 3078 keys->server_random = conn->server_random; 3079 keys->server_random_len = SSL_get_server_random( 3080 ssl, conn->server_random, sizeof(conn->server_random)); 3081 3082 return 0; 3083 } 3084 3085 3086 #ifndef CONFIG_FIPS 3087 static int openssl_get_keyblock_size(SSL *ssl) 3088 { 3089 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER) 3090 const EVP_CIPHER *c; 3091 const EVP_MD *h; 3092 int md_size; 3093 3094 if (ssl->enc_read_ctx == NULL || ssl->enc_read_ctx->cipher == NULL || 3095 ssl->read_hash == NULL) 3096 return -1; 3097 3098 c = ssl->enc_read_ctx->cipher; 3099 h = EVP_MD_CTX_md(ssl->read_hash); 3100 if (h) 3101 md_size = EVP_MD_size(h); 3102 else if (ssl->s3) 3103 md_size = ssl->s3->tmp.new_mac_secret_size; 3104 else 3105 return -1; 3106 3107 wpa_printf(MSG_DEBUG, "OpenSSL: keyblock size: key_len=%d MD_size=%d " 3108 "IV_len=%d", EVP_CIPHER_key_length(c), md_size, 3109 EVP_CIPHER_iv_length(c)); 3110 return 2 * (EVP_CIPHER_key_length(c) + 3111 md_size + 3112 EVP_CIPHER_iv_length(c)); 3113 #else 3114 const SSL_CIPHER *ssl_cipher; 3115 int cipher, digest; 3116 const EVP_CIPHER *c; 3117 const EVP_MD *h; 3118 3119 ssl_cipher = SSL_get_current_cipher(ssl); 3120 if (!ssl_cipher) 3121 return -1; 3122 cipher = SSL_CIPHER_get_cipher_nid(ssl_cipher); 3123 digest = SSL_CIPHER_get_digest_nid(ssl_cipher); 3124 wpa_printf(MSG_DEBUG, "OpenSSL: cipher nid %d digest nid %d", 3125 cipher, digest); 3126 if (cipher < 0 || digest < 0) 3127 return -1; 3128 c = EVP_get_cipherbynid(cipher); 3129 h = EVP_get_digestbynid(digest); 3130 if (!c || !h) 3131 return -1; 3132 3133 wpa_printf(MSG_DEBUG, 3134 "OpenSSL: keyblock size: key_len=%d MD_size=%d IV_len=%d", 3135 EVP_CIPHER_key_length(c), EVP_MD_size(h), 3136 EVP_CIPHER_iv_length(c)); 3137 return 2 * (EVP_CIPHER_key_length(c) + EVP_MD_size(h) + 3138 EVP_CIPHER_iv_length(c)); 3139 #endif 3140 } 3141 #endif /* CONFIG_FIPS */ 3142 3143 3144 static int openssl_tls_prf(struct tls_connection *conn, 3145 const char *label, int server_random_first, 3146 int skip_keyblock, u8 *out, size_t out_len) 3147 { 3148 #ifdef CONFIG_FIPS 3149 wpa_printf(MSG_ERROR, "OpenSSL: TLS keys cannot be exported in FIPS " 3150 "mode"); 3151 return -1; 3152 #else /* CONFIG_FIPS */ 3153 SSL *ssl; 3154 SSL_SESSION *sess; 3155 u8 *rnd; 3156 int ret = -1; 3157 int skip = 0; 3158 u8 *tmp_out = NULL; 3159 u8 *_out = out; 3160 unsigned char client_random[SSL3_RANDOM_SIZE]; 3161 unsigned char server_random[SSL3_RANDOM_SIZE]; 3162 unsigned char master_key[64]; 3163 size_t master_key_len; 3164 const char *ver; 3165 3166 /* 3167 * TLS library did not support key generation, so get the needed TLS 3168 * session parameters and use an internal implementation of TLS PRF to 3169 * derive the key. 3170 */ 3171 3172 if (conn == NULL) 3173 return -1; 3174 ssl = conn->ssl; 3175 if (ssl == NULL) 3176 return -1; 3177 ver = SSL_get_version(ssl); 3178 sess = SSL_get_session(ssl); 3179 if (!ver || !sess) 3180 return -1; 3181 3182 if (skip_keyblock) { 3183 skip = openssl_get_keyblock_size(ssl); 3184 if (skip < 0) 3185 return -1; 3186 tmp_out = os_malloc(skip + out_len); 3187 if (!tmp_out) 3188 return -1; 3189 _out = tmp_out; 3190 } 3191 3192 rnd = os_malloc(2 * SSL3_RANDOM_SIZE); 3193 if (!rnd) { 3194 os_free(tmp_out); 3195 return -1; 3196 } 3197 3198 SSL_get_client_random(ssl, client_random, sizeof(client_random)); 3199 SSL_get_server_random(ssl, server_random, sizeof(server_random)); 3200 master_key_len = SSL_SESSION_get_master_key(sess, master_key, 3201 sizeof(master_key)); 3202 3203 if (server_random_first) { 3204 os_memcpy(rnd, server_random, SSL3_RANDOM_SIZE); 3205 os_memcpy(rnd + SSL3_RANDOM_SIZE, client_random, 3206 SSL3_RANDOM_SIZE); 3207 } else { 3208 os_memcpy(rnd, client_random, SSL3_RANDOM_SIZE); 3209 os_memcpy(rnd + SSL3_RANDOM_SIZE, server_random, 3210 SSL3_RANDOM_SIZE); 3211 } 3212 3213 if (os_strcmp(ver, "TLSv1.2") == 0) { 3214 tls_prf_sha256(master_key, master_key_len, 3215 label, rnd, 2 * SSL3_RANDOM_SIZE, 3216 _out, skip + out_len); 3217 ret = 0; 3218 } else if (tls_prf_sha1_md5(master_key, master_key_len, 3219 label, rnd, 2 * SSL3_RANDOM_SIZE, 3220 _out, skip + out_len) == 0) { 3221 ret = 0; 3222 } 3223 os_memset(master_key, 0, sizeof(master_key)); 3224 os_free(rnd); 3225 if (ret == 0 && skip_keyblock) 3226 os_memcpy(out, _out + skip, out_len); 3227 bin_clear_free(tmp_out, skip); 3228 3229 return ret; 3230 #endif /* CONFIG_FIPS */ 3231 } 3232 3233 3234 int tls_connection_prf(void *tls_ctx, struct tls_connection *conn, 3235 const char *label, int server_random_first, 3236 int skip_keyblock, u8 *out, size_t out_len) 3237 { 3238 if (conn == NULL) 3239 return -1; 3240 if (server_random_first || skip_keyblock) 3241 return openssl_tls_prf(conn, label, 3242 server_random_first, skip_keyblock, 3243 out, out_len); 3244 if (SSL_export_keying_material(conn->ssl, out, out_len, label, 3245 os_strlen(label), NULL, 0, 0) == 1) { 3246 wpa_printf(MSG_DEBUG, "OpenSSL: Using internal PRF"); 3247 return 0; 3248 } 3249 return openssl_tls_prf(conn, label, server_random_first, 3250 skip_keyblock, out, out_len); 3251 } 3252 3253 3254 static struct wpabuf * 3255 openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data, 3256 int server) 3257 { 3258 int res; 3259 struct wpabuf *out_data; 3260 3261 /* 3262 * Give TLS handshake data from the server (if available) to OpenSSL 3263 * for processing. 3264 */ 3265 if (in_data && wpabuf_len(in_data) > 0 && 3266 BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data)) 3267 < 0) { 3268 tls_show_errors(MSG_INFO, __func__, 3269 "Handshake failed - BIO_write"); 3270 return NULL; 3271 } 3272 3273 /* Initiate TLS handshake or continue the existing handshake */ 3274 if (server) 3275 res = SSL_accept(conn->ssl); 3276 else 3277 res = SSL_connect(conn->ssl); 3278 if (res != 1) { 3279 int err = SSL_get_error(conn->ssl, res); 3280 if (err == SSL_ERROR_WANT_READ) 3281 wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want " 3282 "more data"); 3283 else if (err == SSL_ERROR_WANT_WRITE) 3284 wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to " 3285 "write"); 3286 else { 3287 tls_show_errors(MSG_INFO, __func__, "SSL_connect"); 3288 conn->failed++; 3289 } 3290 } 3291 3292 /* Get the TLS handshake data to be sent to the server */ 3293 res = BIO_ctrl_pending(conn->ssl_out); 3294 wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res); 3295 out_data = wpabuf_alloc(res); 3296 if (out_data == NULL) { 3297 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for " 3298 "handshake output (%d bytes)", res); 3299 if (BIO_reset(conn->ssl_out) < 0) { 3300 tls_show_errors(MSG_INFO, __func__, 3301 "BIO_reset failed"); 3302 } 3303 return NULL; 3304 } 3305 res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data), 3306 res); 3307 if (res < 0) { 3308 tls_show_errors(MSG_INFO, __func__, 3309 "Handshake failed - BIO_read"); 3310 if (BIO_reset(conn->ssl_out) < 0) { 3311 tls_show_errors(MSG_INFO, __func__, 3312 "BIO_reset failed"); 3313 } 3314 wpabuf_free(out_data); 3315 return NULL; 3316 } 3317 wpabuf_put(out_data, res); 3318 3319 return out_data; 3320 } 3321 3322 3323 static struct wpabuf * 3324 openssl_get_appl_data(struct tls_connection *conn, size_t max_len) 3325 { 3326 struct wpabuf *appl_data; 3327 int res; 3328 3329 appl_data = wpabuf_alloc(max_len + 100); 3330 if (appl_data == NULL) 3331 return NULL; 3332 3333 res = SSL_read(conn->ssl, wpabuf_mhead(appl_data), 3334 wpabuf_size(appl_data)); 3335 if (res < 0) { 3336 int err = SSL_get_error(conn->ssl, res); 3337 if (err == SSL_ERROR_WANT_READ || 3338 err == SSL_ERROR_WANT_WRITE) { 3339 wpa_printf(MSG_DEBUG, "SSL: No Application Data " 3340 "included"); 3341 } else { 3342 tls_show_errors(MSG_INFO, __func__, 3343 "Failed to read possible " 3344 "Application Data"); 3345 } 3346 wpabuf_free(appl_data); 3347 return NULL; 3348 } 3349 3350 wpabuf_put(appl_data, res); 3351 wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished " 3352 "message", appl_data); 3353 3354 return appl_data; 3355 } 3356 3357 3358 static struct wpabuf * 3359 openssl_connection_handshake(struct tls_connection *conn, 3360 const struct wpabuf *in_data, 3361 struct wpabuf **appl_data, int server) 3362 { 3363 struct wpabuf *out_data; 3364 3365 if (appl_data) 3366 *appl_data = NULL; 3367 3368 out_data = openssl_handshake(conn, in_data, server); 3369 if (out_data == NULL) 3370 return NULL; 3371 if (conn->invalid_hb_used) { 3372 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response"); 3373 wpabuf_free(out_data); 3374 return NULL; 3375 } 3376 3377 if (SSL_is_init_finished(conn->ssl)) { 3378 wpa_printf(MSG_DEBUG, 3379 "OpenSSL: Handshake finished - resumed=%d", 3380 tls_connection_resumed(conn->ssl_ctx, conn)); 3381 if (appl_data && in_data) 3382 *appl_data = openssl_get_appl_data(conn, 3383 wpabuf_len(in_data)); 3384 } 3385 3386 if (conn->invalid_hb_used) { 3387 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response"); 3388 if (appl_data) { 3389 wpabuf_free(*appl_data); 3390 *appl_data = NULL; 3391 } 3392 wpabuf_free(out_data); 3393 return NULL; 3394 } 3395 3396 return out_data; 3397 } 3398 3399 3400 struct wpabuf * 3401 tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn, 3402 const struct wpabuf *in_data, 3403 struct wpabuf **appl_data) 3404 { 3405 return openssl_connection_handshake(conn, in_data, appl_data, 0); 3406 } 3407 3408 3409 struct wpabuf * tls_connection_server_handshake(void *tls_ctx, 3410 struct tls_connection *conn, 3411 const struct wpabuf *in_data, 3412 struct wpabuf **appl_data) 3413 { 3414 return openssl_connection_handshake(conn, in_data, appl_data, 1); 3415 } 3416 3417 3418 struct wpabuf * tls_connection_encrypt(void *tls_ctx, 3419 struct tls_connection *conn, 3420 const struct wpabuf *in_data) 3421 { 3422 int res; 3423 struct wpabuf *buf; 3424 3425 if (conn == NULL) 3426 return NULL; 3427 3428 /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */ 3429 if ((res = BIO_reset(conn->ssl_in)) < 0 || 3430 (res = BIO_reset(conn->ssl_out)) < 0) { 3431 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed"); 3432 return NULL; 3433 } 3434 res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data)); 3435 if (res < 0) { 3436 tls_show_errors(MSG_INFO, __func__, 3437 "Encryption failed - SSL_write"); 3438 return NULL; 3439 } 3440 3441 /* Read encrypted data to be sent to the server */ 3442 buf = wpabuf_alloc(wpabuf_len(in_data) + 300); 3443 if (buf == NULL) 3444 return NULL; 3445 res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf)); 3446 if (res < 0) { 3447 tls_show_errors(MSG_INFO, __func__, 3448 "Encryption failed - BIO_read"); 3449 wpabuf_free(buf); 3450 return NULL; 3451 } 3452 wpabuf_put(buf, res); 3453 3454 return buf; 3455 } 3456 3457 3458 struct wpabuf * tls_connection_decrypt(void *tls_ctx, 3459 struct tls_connection *conn, 3460 const struct wpabuf *in_data) 3461 { 3462 int res; 3463 struct wpabuf *buf; 3464 3465 /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */ 3466 res = BIO_write(conn->ssl_in, wpabuf_head(in_data), 3467 wpabuf_len(in_data)); 3468 if (res < 0) { 3469 tls_show_errors(MSG_INFO, __func__, 3470 "Decryption failed - BIO_write"); 3471 return NULL; 3472 } 3473 if (BIO_reset(conn->ssl_out) < 0) { 3474 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed"); 3475 return NULL; 3476 } 3477 3478 /* Read decrypted data for further processing */ 3479 /* 3480 * Even though we try to disable TLS compression, it is possible that 3481 * this cannot be done with all TLS libraries. Add extra buffer space 3482 * to handle the possibility of the decrypted data being longer than 3483 * input data. 3484 */ 3485 buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3); 3486 if (buf == NULL) 3487 return NULL; 3488 res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf)); 3489 if (res < 0) { 3490 tls_show_errors(MSG_INFO, __func__, 3491 "Decryption failed - SSL_read"); 3492 wpabuf_free(buf); 3493 return NULL; 3494 } 3495 wpabuf_put(buf, res); 3496 3497 if (conn->invalid_hb_used) { 3498 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response"); 3499 wpabuf_free(buf); 3500 return NULL; 3501 } 3502 3503 return buf; 3504 } 3505 3506 3507 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn) 3508 { 3509 return conn ? SSL_cache_hit(conn->ssl) : 0; 3510 } 3511 3512 3513 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn, 3514 u8 *ciphers) 3515 { 3516 char buf[500], *pos, *end; 3517 u8 *c; 3518 int ret; 3519 3520 if (conn == NULL || conn->ssl == NULL || ciphers == NULL) 3521 return -1; 3522 3523 buf[0] = '\0'; 3524 pos = buf; 3525 end = pos + sizeof(buf); 3526 3527 c = ciphers; 3528 while (*c != TLS_CIPHER_NONE) { 3529 const char *suite; 3530 3531 switch (*c) { 3532 case TLS_CIPHER_RC4_SHA: 3533 suite = "RC4-SHA"; 3534 break; 3535 case TLS_CIPHER_AES128_SHA: 3536 suite = "AES128-SHA"; 3537 break; 3538 case TLS_CIPHER_RSA_DHE_AES128_SHA: 3539 suite = "DHE-RSA-AES128-SHA"; 3540 break; 3541 case TLS_CIPHER_ANON_DH_AES128_SHA: 3542 suite = "ADH-AES128-SHA"; 3543 break; 3544 case TLS_CIPHER_RSA_DHE_AES256_SHA: 3545 suite = "DHE-RSA-AES256-SHA"; 3546 break; 3547 case TLS_CIPHER_AES256_SHA: 3548 suite = "AES256-SHA"; 3549 break; 3550 default: 3551 wpa_printf(MSG_DEBUG, "TLS: Unsupported " 3552 "cipher selection: %d", *c); 3553 return -1; 3554 } 3555 ret = os_snprintf(pos, end - pos, ":%s", suite); 3556 if (os_snprintf_error(end - pos, ret)) 3557 break; 3558 pos += ret; 3559 3560 c++; 3561 } 3562 3563 wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1); 3564 3565 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER) 3566 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST) 3567 if (os_strstr(buf, ":ADH-")) { 3568 /* 3569 * Need to drop to security level 0 to allow anonymous 3570 * cipher suites for EAP-FAST. 3571 */ 3572 SSL_set_security_level(conn->ssl, 0); 3573 } else if (SSL_get_security_level(conn->ssl) == 0) { 3574 /* Force at least security level 1 */ 3575 SSL_set_security_level(conn->ssl, 1); 3576 } 3577 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */ 3578 #endif 3579 3580 if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) { 3581 tls_show_errors(MSG_INFO, __func__, 3582 "Cipher suite configuration failed"); 3583 return -1; 3584 } 3585 3586 return 0; 3587 } 3588 3589 3590 int tls_get_version(void *ssl_ctx, struct tls_connection *conn, 3591 char *buf, size_t buflen) 3592 { 3593 const char *name; 3594 if (conn == NULL || conn->ssl == NULL) 3595 return -1; 3596 3597 name = SSL_get_version(conn->ssl); 3598 if (name == NULL) 3599 return -1; 3600 3601 os_strlcpy(buf, name, buflen); 3602 return 0; 3603 } 3604 3605 3606 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn, 3607 char *buf, size_t buflen) 3608 { 3609 const char *name; 3610 if (conn == NULL || conn->ssl == NULL) 3611 return -1; 3612 3613 name = SSL_get_cipher(conn->ssl); 3614 if (name == NULL) 3615 return -1; 3616 3617 os_strlcpy(buf, name, buflen); 3618 return 0; 3619 } 3620 3621 3622 int tls_connection_enable_workaround(void *ssl_ctx, 3623 struct tls_connection *conn) 3624 { 3625 SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS); 3626 3627 return 0; 3628 } 3629 3630 3631 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST) 3632 /* ClientHello TLS extensions require a patch to openssl, so this function is 3633 * commented out unless explicitly needed for EAP-FAST in order to be able to 3634 * build this file with unmodified openssl. */ 3635 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn, 3636 int ext_type, const u8 *data, 3637 size_t data_len) 3638 { 3639 if (conn == NULL || conn->ssl == NULL || ext_type != 35) 3640 return -1; 3641 3642 if (SSL_set_session_ticket_ext(conn->ssl, (void *) data, 3643 data_len) != 1) 3644 return -1; 3645 3646 return 0; 3647 } 3648 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */ 3649 3650 3651 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn) 3652 { 3653 if (conn == NULL) 3654 return -1; 3655 return conn->failed; 3656 } 3657 3658 3659 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn) 3660 { 3661 if (conn == NULL) 3662 return -1; 3663 return conn->read_alerts; 3664 } 3665 3666 3667 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn) 3668 { 3669 if (conn == NULL) 3670 return -1; 3671 return conn->write_alerts; 3672 } 3673 3674 3675 #ifdef HAVE_OCSP 3676 3677 static void ocsp_debug_print_resp(OCSP_RESPONSE *rsp) 3678 { 3679 #ifndef CONFIG_NO_STDOUT_DEBUG 3680 BIO *out; 3681 size_t rlen; 3682 char *txt; 3683 int res; 3684 3685 if (wpa_debug_level > MSG_DEBUG) 3686 return; 3687 3688 out = BIO_new(BIO_s_mem()); 3689 if (!out) 3690 return; 3691 3692 OCSP_RESPONSE_print(out, rsp, 0); 3693 rlen = BIO_ctrl_pending(out); 3694 txt = os_malloc(rlen + 1); 3695 if (!txt) { 3696 BIO_free(out); 3697 return; 3698 } 3699 3700 res = BIO_read(out, txt, rlen); 3701 if (res > 0) { 3702 txt[res] = '\0'; 3703 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP Response\n%s", txt); 3704 } 3705 os_free(txt); 3706 BIO_free(out); 3707 #endif /* CONFIG_NO_STDOUT_DEBUG */ 3708 } 3709 3710 3711 static void debug_print_cert(X509 *cert, const char *title) 3712 { 3713 #ifndef CONFIG_NO_STDOUT_DEBUG 3714 BIO *out; 3715 size_t rlen; 3716 char *txt; 3717 int res; 3718 3719 if (wpa_debug_level > MSG_DEBUG) 3720 return; 3721 3722 out = BIO_new(BIO_s_mem()); 3723 if (!out) 3724 return; 3725 3726 X509_print(out, cert); 3727 rlen = BIO_ctrl_pending(out); 3728 txt = os_malloc(rlen + 1); 3729 if (!txt) { 3730 BIO_free(out); 3731 return; 3732 } 3733 3734 res = BIO_read(out, txt, rlen); 3735 if (res > 0) { 3736 txt[res] = '\0'; 3737 wpa_printf(MSG_DEBUG, "OpenSSL: %s\n%s", title, txt); 3738 } 3739 os_free(txt); 3740 3741 BIO_free(out); 3742 #endif /* CONFIG_NO_STDOUT_DEBUG */ 3743 } 3744 3745 3746 static int ocsp_resp_cb(SSL *s, void *arg) 3747 { 3748 struct tls_connection *conn = arg; 3749 const unsigned char *p; 3750 int len, status, reason; 3751 OCSP_RESPONSE *rsp; 3752 OCSP_BASICRESP *basic; 3753 OCSP_CERTID *id; 3754 ASN1_GENERALIZEDTIME *produced_at, *this_update, *next_update; 3755 X509_STORE *store; 3756 STACK_OF(X509) *certs = NULL; 3757 3758 len = SSL_get_tlsext_status_ocsp_resp(s, &p); 3759 if (!p) { 3760 wpa_printf(MSG_DEBUG, "OpenSSL: No OCSP response received"); 3761 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1; 3762 } 3763 3764 wpa_hexdump(MSG_DEBUG, "OpenSSL: OCSP response", p, len); 3765 3766 rsp = d2i_OCSP_RESPONSE(NULL, &p, len); 3767 if (!rsp) { 3768 wpa_printf(MSG_INFO, "OpenSSL: Failed to parse OCSP response"); 3769 return 0; 3770 } 3771 3772 ocsp_debug_print_resp(rsp); 3773 3774 status = OCSP_response_status(rsp); 3775 if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) { 3776 wpa_printf(MSG_INFO, "OpenSSL: OCSP responder error %d (%s)", 3777 status, OCSP_response_status_str(status)); 3778 return 0; 3779 } 3780 3781 basic = OCSP_response_get1_basic(rsp); 3782 if (!basic) { 3783 wpa_printf(MSG_INFO, "OpenSSL: Could not find BasicOCSPResponse"); 3784 return 0; 3785 } 3786 3787 store = SSL_CTX_get_cert_store(conn->ssl_ctx); 3788 if (conn->peer_issuer) { 3789 debug_print_cert(conn->peer_issuer, "Add OCSP issuer"); 3790 3791 if (X509_STORE_add_cert(store, conn->peer_issuer) != 1) { 3792 tls_show_errors(MSG_INFO, __func__, 3793 "OpenSSL: Could not add issuer to certificate store"); 3794 } 3795 certs = sk_X509_new_null(); 3796 if (certs) { 3797 X509 *cert; 3798 cert = X509_dup(conn->peer_issuer); 3799 if (cert && !sk_X509_push(certs, cert)) { 3800 tls_show_errors( 3801 MSG_INFO, __func__, 3802 "OpenSSL: Could not add issuer to OCSP responder trust store"); 3803 X509_free(cert); 3804 sk_X509_free(certs); 3805 certs = NULL; 3806 } 3807 if (certs && conn->peer_issuer_issuer) { 3808 cert = X509_dup(conn->peer_issuer_issuer); 3809 if (cert && !sk_X509_push(certs, cert)) { 3810 tls_show_errors( 3811 MSG_INFO, __func__, 3812 "OpenSSL: Could not add issuer's issuer to OCSP responder trust store"); 3813 X509_free(cert); 3814 } 3815 } 3816 } 3817 } 3818 3819 status = OCSP_basic_verify(basic, certs, store, OCSP_TRUSTOTHER); 3820 sk_X509_pop_free(certs, X509_free); 3821 if (status <= 0) { 3822 tls_show_errors(MSG_INFO, __func__, 3823 "OpenSSL: OCSP response failed verification"); 3824 OCSP_BASICRESP_free(basic); 3825 OCSP_RESPONSE_free(rsp); 3826 return 0; 3827 } 3828 3829 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP response verification succeeded"); 3830 3831 if (!conn->peer_cert) { 3832 wpa_printf(MSG_DEBUG, "OpenSSL: Peer certificate not available for OCSP status check"); 3833 OCSP_BASICRESP_free(basic); 3834 OCSP_RESPONSE_free(rsp); 3835 return 0; 3836 } 3837 3838 if (!conn->peer_issuer) { 3839 wpa_printf(MSG_DEBUG, "OpenSSL: Peer issuer certificate not available for OCSP status check"); 3840 OCSP_BASICRESP_free(basic); 3841 OCSP_RESPONSE_free(rsp); 3842 return 0; 3843 } 3844 3845 id = OCSP_cert_to_id(NULL, conn->peer_cert, conn->peer_issuer); 3846 if (!id) { 3847 wpa_printf(MSG_DEBUG, "OpenSSL: Could not create OCSP certificate identifier"); 3848 OCSP_BASICRESP_free(basic); 3849 OCSP_RESPONSE_free(rsp); 3850 return 0; 3851 } 3852 3853 if (!OCSP_resp_find_status(basic, id, &status, &reason, &produced_at, 3854 &this_update, &next_update)) { 3855 wpa_printf(MSG_INFO, "OpenSSL: Could not find current server certificate from OCSP response%s", 3856 (conn->flags & TLS_CONN_REQUIRE_OCSP) ? "" : 3857 " (OCSP not required)"); 3858 OCSP_CERTID_free(id); 3859 OCSP_BASICRESP_free(basic); 3860 OCSP_RESPONSE_free(rsp); 3861 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1; 3862 } 3863 OCSP_CERTID_free(id); 3864 3865 if (!OCSP_check_validity(this_update, next_update, 5 * 60, -1)) { 3866 tls_show_errors(MSG_INFO, __func__, 3867 "OpenSSL: OCSP status times invalid"); 3868 OCSP_BASICRESP_free(basic); 3869 OCSP_RESPONSE_free(rsp); 3870 return 0; 3871 } 3872 3873 OCSP_BASICRESP_free(basic); 3874 OCSP_RESPONSE_free(rsp); 3875 3876 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status for server certificate: %s", 3877 OCSP_cert_status_str(status)); 3878 3879 if (status == V_OCSP_CERTSTATUS_GOOD) 3880 return 1; 3881 if (status == V_OCSP_CERTSTATUS_REVOKED) 3882 return 0; 3883 if (conn->flags & TLS_CONN_REQUIRE_OCSP) { 3884 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP required"); 3885 return 0; 3886 } 3887 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP was not required, so allow connection to continue"); 3888 return 1; 3889 } 3890 3891 3892 static int ocsp_status_cb(SSL *s, void *arg) 3893 { 3894 char *tmp; 3895 char *resp; 3896 size_t len; 3897 3898 if (tls_global->ocsp_stapling_response == NULL) { 3899 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - no response configured"); 3900 return SSL_TLSEXT_ERR_OK; 3901 } 3902 3903 resp = os_readfile(tls_global->ocsp_stapling_response, &len); 3904 if (resp == NULL) { 3905 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - could not read response file"); 3906 /* TODO: Build OCSPResponse with responseStatus = internalError 3907 */ 3908 return SSL_TLSEXT_ERR_OK; 3909 } 3910 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - send cached response"); 3911 tmp = OPENSSL_malloc(len); 3912 if (tmp == NULL) { 3913 os_free(resp); 3914 return SSL_TLSEXT_ERR_ALERT_FATAL; 3915 } 3916 3917 os_memcpy(tmp, resp, len); 3918 os_free(resp); 3919 SSL_set_tlsext_status_ocsp_resp(s, tmp, len); 3920 3921 return SSL_TLSEXT_ERR_OK; 3922 } 3923 3924 #endif /* HAVE_OCSP */ 3925 3926 3927 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn, 3928 const struct tls_connection_params *params) 3929 { 3930 struct tls_data *data = tls_ctx; 3931 int ret; 3932 unsigned long err; 3933 int can_pkcs11 = 0; 3934 const char *key_id = params->key_id; 3935 const char *cert_id = params->cert_id; 3936 const char *ca_cert_id = params->ca_cert_id; 3937 const char *engine_id = params->engine ? params->engine_id : NULL; 3938 3939 if (conn == NULL) 3940 return -1; 3941 3942 if (params->flags & TLS_CONN_REQUIRE_OCSP_ALL) { 3943 wpa_printf(MSG_INFO, 3944 "OpenSSL: ocsp=3 not supported"); 3945 return -1; 3946 } 3947 3948 /* 3949 * If the engine isn't explicitly configured, and any of the 3950 * cert/key fields are actually PKCS#11 URIs, then automatically 3951 * use the PKCS#11 ENGINE. 3952 */ 3953 if (!engine_id || os_strcmp(engine_id, "pkcs11") == 0) 3954 can_pkcs11 = 1; 3955 3956 if (!key_id && params->private_key && can_pkcs11 && 3957 os_strncmp(params->private_key, "pkcs11:", 7) == 0) { 3958 can_pkcs11 = 2; 3959 key_id = params->private_key; 3960 } 3961 3962 if (!cert_id && params->client_cert && can_pkcs11 && 3963 os_strncmp(params->client_cert, "pkcs11:", 7) == 0) { 3964 can_pkcs11 = 2; 3965 cert_id = params->client_cert; 3966 } 3967 3968 if (!ca_cert_id && params->ca_cert && can_pkcs11 && 3969 os_strncmp(params->ca_cert, "pkcs11:", 7) == 0) { 3970 can_pkcs11 = 2; 3971 ca_cert_id = params->ca_cert; 3972 } 3973 3974 /* If we need to automatically enable the PKCS#11 ENGINE, do so. */ 3975 if (can_pkcs11 == 2 && !engine_id) 3976 engine_id = "pkcs11"; 3977 3978 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST) 3979 #if OPENSSL_VERSION_NUMBER < 0x10100000L 3980 if (params->flags & TLS_CONN_EAP_FAST) { 3981 wpa_printf(MSG_DEBUG, 3982 "OpenSSL: Use TLSv1_method() for EAP-FAST"); 3983 if (SSL_set_ssl_method(conn->ssl, TLSv1_method()) != 1) { 3984 tls_show_errors(MSG_INFO, __func__, 3985 "Failed to set TLSv1_method() for EAP-FAST"); 3986 return -1; 3987 } 3988 } 3989 #endif 3990 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */ 3991 3992 while ((err = ERR_get_error())) { 3993 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s", 3994 __func__, ERR_error_string(err, NULL)); 3995 } 3996 3997 if (engine_id) { 3998 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine"); 3999 ret = tls_engine_init(conn, engine_id, params->pin, 4000 key_id, cert_id, ca_cert_id); 4001 if (ret) 4002 return ret; 4003 } 4004 if (tls_connection_set_subject_match(conn, 4005 params->subject_match, 4006 params->altsubject_match, 4007 params->suffix_match, 4008 params->domain_match)) 4009 return -1; 4010 4011 if (engine_id && ca_cert_id) { 4012 if (tls_connection_engine_ca_cert(data, conn, ca_cert_id)) 4013 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED; 4014 } else if (tls_connection_ca_cert(data, conn, params->ca_cert, 4015 params->ca_cert_blob, 4016 params->ca_cert_blob_len, 4017 params->ca_path)) 4018 return -1; 4019 4020 if (engine_id && cert_id) { 4021 if (tls_connection_engine_client_cert(conn, cert_id)) 4022 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED; 4023 } else if (tls_connection_client_cert(conn, params->client_cert, 4024 params->client_cert_blob, 4025 params->client_cert_blob_len)) 4026 return -1; 4027 4028 if (engine_id && key_id) { 4029 wpa_printf(MSG_DEBUG, "TLS: Using private key from engine"); 4030 if (tls_connection_engine_private_key(conn)) 4031 return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED; 4032 } else if (tls_connection_private_key(data, conn, 4033 params->private_key, 4034 params->private_key_passwd, 4035 params->private_key_blob, 4036 params->private_key_blob_len)) { 4037 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'", 4038 params->private_key); 4039 return -1; 4040 } 4041 4042 if (tls_connection_dh(conn, params->dh_file)) { 4043 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'", 4044 params->dh_file); 4045 return -1; 4046 } 4047 4048 if (params->openssl_ciphers && 4049 SSL_set_cipher_list(conn->ssl, params->openssl_ciphers) != 1) { 4050 wpa_printf(MSG_INFO, 4051 "OpenSSL: Failed to set cipher string '%s'", 4052 params->openssl_ciphers); 4053 return -1; 4054 } 4055 4056 tls_set_conn_flags(conn->ssl, params->flags); 4057 4058 #ifdef OPENSSL_IS_BORINGSSL 4059 if (params->flags & TLS_CONN_REQUEST_OCSP) { 4060 SSL_enable_ocsp_stapling(conn->ssl); 4061 } 4062 #else /* OPENSSL_IS_BORINGSSL */ 4063 #ifdef HAVE_OCSP 4064 if (params->flags & TLS_CONN_REQUEST_OCSP) { 4065 SSL_CTX *ssl_ctx = data->ssl; 4066 SSL_set_tlsext_status_type(conn->ssl, TLSEXT_STATUSTYPE_ocsp); 4067 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_resp_cb); 4068 SSL_CTX_set_tlsext_status_arg(ssl_ctx, conn); 4069 } 4070 #else /* HAVE_OCSP */ 4071 if (params->flags & TLS_CONN_REQUIRE_OCSP) { 4072 wpa_printf(MSG_INFO, 4073 "OpenSSL: No OCSP support included - reject configuration"); 4074 return -1; 4075 } 4076 if (params->flags & TLS_CONN_REQUEST_OCSP) { 4077 wpa_printf(MSG_DEBUG, 4078 "OpenSSL: No OCSP support included - allow optional OCSP case to continue"); 4079 } 4080 #endif /* HAVE_OCSP */ 4081 #endif /* OPENSSL_IS_BORINGSSL */ 4082 4083 conn->flags = params->flags; 4084 4085 tls_get_errors(data); 4086 4087 return 0; 4088 } 4089 4090 4091 int tls_global_set_params(void *tls_ctx, 4092 const struct tls_connection_params *params) 4093 { 4094 struct tls_data *data = tls_ctx; 4095 SSL_CTX *ssl_ctx = data->ssl; 4096 unsigned long err; 4097 4098 while ((err = ERR_get_error())) { 4099 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s", 4100 __func__, ERR_error_string(err, NULL)); 4101 } 4102 4103 if (tls_global_ca_cert(data, params->ca_cert) || 4104 tls_global_client_cert(data, params->client_cert) || 4105 tls_global_private_key(data, params->private_key, 4106 params->private_key_passwd) || 4107 tls_global_dh(data, params->dh_file)) { 4108 wpa_printf(MSG_INFO, "TLS: Failed to set global parameters"); 4109 return -1; 4110 } 4111 4112 if (params->openssl_ciphers && 4113 SSL_CTX_set_cipher_list(ssl_ctx, params->openssl_ciphers) != 1) { 4114 wpa_printf(MSG_INFO, 4115 "OpenSSL: Failed to set cipher string '%s'", 4116 params->openssl_ciphers); 4117 return -1; 4118 } 4119 4120 #ifdef SSL_OP_NO_TICKET 4121 if (params->flags & TLS_CONN_DISABLE_SESSION_TICKET) 4122 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET); 4123 #ifdef SSL_CTX_clear_options 4124 else 4125 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TICKET); 4126 #endif /* SSL_clear_options */ 4127 #endif /* SSL_OP_NO_TICKET */ 4128 4129 #ifdef HAVE_OCSP 4130 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_status_cb); 4131 SSL_CTX_set_tlsext_status_arg(ssl_ctx, ssl_ctx); 4132 os_free(tls_global->ocsp_stapling_response); 4133 if (params->ocsp_stapling_response) 4134 tls_global->ocsp_stapling_response = 4135 os_strdup(params->ocsp_stapling_response); 4136 else 4137 tls_global->ocsp_stapling_response = NULL; 4138 #endif /* HAVE_OCSP */ 4139 4140 return 0; 4141 } 4142 4143 4144 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST) 4145 /* Pre-shared secred requires a patch to openssl, so this function is 4146 * commented out unless explicitly needed for EAP-FAST in order to be able to 4147 * build this file with unmodified openssl. */ 4148 4149 #if (defined(OPENSSL_IS_BORINGSSL) || OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER) 4150 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len, 4151 STACK_OF(SSL_CIPHER) *peer_ciphers, 4152 const SSL_CIPHER **cipher, void *arg) 4153 #else /* OPENSSL_IS_BORINGSSL */ 4154 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len, 4155 STACK_OF(SSL_CIPHER) *peer_ciphers, 4156 SSL_CIPHER **cipher, void *arg) 4157 #endif /* OPENSSL_IS_BORINGSSL */ 4158 { 4159 struct tls_connection *conn = arg; 4160 int ret; 4161 4162 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER) 4163 if (conn == NULL || conn->session_ticket_cb == NULL) 4164 return 0; 4165 4166 ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx, 4167 conn->session_ticket, 4168 conn->session_ticket_len, 4169 s->s3->client_random, 4170 s->s3->server_random, secret); 4171 #else 4172 unsigned char client_random[SSL3_RANDOM_SIZE]; 4173 unsigned char server_random[SSL3_RANDOM_SIZE]; 4174 4175 if (conn == NULL || conn->session_ticket_cb == NULL) 4176 return 0; 4177 4178 SSL_get_client_random(s, client_random, sizeof(client_random)); 4179 SSL_get_server_random(s, server_random, sizeof(server_random)); 4180 4181 ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx, 4182 conn->session_ticket, 4183 conn->session_ticket_len, 4184 client_random, 4185 server_random, secret); 4186 #endif 4187 4188 os_free(conn->session_ticket); 4189 conn->session_ticket = NULL; 4190 4191 if (ret <= 0) 4192 return 0; 4193 4194 *secret_len = SSL_MAX_MASTER_KEY_LENGTH; 4195 return 1; 4196 } 4197 4198 4199 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data, 4200 int len, void *arg) 4201 { 4202 struct tls_connection *conn = arg; 4203 4204 if (conn == NULL || conn->session_ticket_cb == NULL) 4205 return 0; 4206 4207 wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len); 4208 4209 os_free(conn->session_ticket); 4210 conn->session_ticket = NULL; 4211 4212 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket " 4213 "extension", data, len); 4214 4215 conn->session_ticket = os_malloc(len); 4216 if (conn->session_ticket == NULL) 4217 return 0; 4218 4219 os_memcpy(conn->session_ticket, data, len); 4220 conn->session_ticket_len = len; 4221 4222 return 1; 4223 } 4224 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */ 4225 4226 4227 int tls_connection_set_session_ticket_cb(void *tls_ctx, 4228 struct tls_connection *conn, 4229 tls_session_ticket_cb cb, 4230 void *ctx) 4231 { 4232 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST) 4233 conn->session_ticket_cb = cb; 4234 conn->session_ticket_cb_ctx = ctx; 4235 4236 if (cb) { 4237 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb, 4238 conn) != 1) 4239 return -1; 4240 SSL_set_session_ticket_ext_cb(conn->ssl, 4241 tls_session_ticket_ext_cb, conn); 4242 } else { 4243 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1) 4244 return -1; 4245 SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL); 4246 } 4247 4248 return 0; 4249 #else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */ 4250 return -1; 4251 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */ 4252 } 4253 4254 4255 int tls_get_library_version(char *buf, size_t buf_len) 4256 { 4257 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER) 4258 return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s", 4259 OPENSSL_VERSION_TEXT, 4260 OpenSSL_version(OPENSSL_VERSION)); 4261 #else 4262 return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s", 4263 OPENSSL_VERSION_TEXT, 4264 SSLeay_version(SSLEAY_VERSION)); 4265 #endif 4266 } 4267 4268 4269 void tls_connection_set_success_data(struct tls_connection *conn, 4270 struct wpabuf *data) 4271 { 4272 SSL_SESSION *sess; 4273 struct wpabuf *old; 4274 4275 if (tls_ex_idx_session < 0) 4276 goto fail; 4277 sess = SSL_get_session(conn->ssl); 4278 if (!sess) 4279 goto fail; 4280 old = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session); 4281 if (old) { 4282 wpa_printf(MSG_DEBUG, "OpenSSL: Replacing old success data %p", 4283 old); 4284 wpabuf_free(old); 4285 } 4286 if (SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, data) != 1) 4287 goto fail; 4288 4289 wpa_printf(MSG_DEBUG, "OpenSSL: Stored success data %p", data); 4290 conn->success_data = 1; 4291 return; 4292 4293 fail: 4294 wpa_printf(MSG_INFO, "OpenSSL: Failed to store success data"); 4295 wpabuf_free(data); 4296 } 4297 4298 4299 void tls_connection_set_success_data_resumed(struct tls_connection *conn) 4300 { 4301 wpa_printf(MSG_DEBUG, 4302 "OpenSSL: Success data accepted for resumed session"); 4303 conn->success_data = 1; 4304 } 4305 4306 4307 const struct wpabuf * 4308 tls_connection_get_success_data(struct tls_connection *conn) 4309 { 4310 SSL_SESSION *sess; 4311 4312 if (tls_ex_idx_session < 0 || 4313 !(sess = SSL_get_session(conn->ssl))) 4314 return NULL; 4315 return SSL_SESSION_get_ex_data(sess, tls_ex_idx_session); 4316 } 4317 4318 4319 void tls_connection_remove_session(struct tls_connection *conn) 4320 { 4321 SSL_SESSION *sess; 4322 4323 sess = SSL_get_session(conn->ssl); 4324 if (!sess) 4325 return; 4326 4327 if (SSL_CTX_remove_session(conn->ssl_ctx, sess) != 1) 4328 wpa_printf(MSG_DEBUG, 4329 "OpenSSL: Session was not cached"); 4330 else 4331 wpa_printf(MSG_DEBUG, 4332 "OpenSSL: Removed cached session to disable session resumption"); 4333 } 4334
