contrib/wpa/src/crypto/tls_openssl.c

   1 /*
   2  * SSL/TLS interface functions for OpenSSL
   3  * Copyright (c) 2004-2015, Jouni Malinen <j@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/opensslv.h>
  22 #include <openssl/pkcs12.h>
  23 #include <openssl/x509v3.h>
  24 #ifndef OPENSSL_NO_ENGINE
  25 #include <openssl/engine.h>
  26 #endif /* OPENSSL_NO_ENGINE */
  27 #ifndef OPENSSL_NO_DSA
  28 #include <openssl/dsa.h>
  29 #endif
  30 #ifndef OPENSSL_NO_DH
  31 #include <openssl/dh.h>
  32 #endif
  33
  34 #include "common.h"
  35 #include "crypto.h"
  36 #include "sha1.h"
  37 #include "sha256.h"
  38 #include "tls.h"
  39 #include "tls_openssl.h"
  40
  41 #if !defined(CONFIG_FIPS) &&                             \
  42     (defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) ||   \
  43      defined(EAP_SERVER_FAST))
  44 #define OPENSSL_NEED_EAP_FAST_PRF
  45 #endif
  46
  47 #if defined(OPENSSL_IS_BORINGSSL)
  48 /* stack_index_t is the return type of OpenSSL's sk_XXX_num() functions. */
  49 typedef size_t stack_index_t;
  50 #else
  51 typedef int stack_index_t;
  52 #endif
  53
  54 #ifdef SSL_set_tlsext_status_type
  55 #ifndef OPENSSL_NO_TLSEXT
  56 #define HAVE_OCSP
  57 #include <openssl/ocsp.h>
  58 #endif /* OPENSSL_NO_TLSEXT */
  59 #endif /* SSL_set_tlsext_status_type */
  60
  61 #if (OPENSSL_VERSION_NUMBER < 0x10100000L || \
  62      (defined(LIBRESSL_VERSION_NUMBER) && \
  63       LIBRESSL_VERSION_NUMBER < 0x20700000L)) && \
  64     !defined(BORINGSSL_API_VERSION)
  65 /*
  66  * SSL_get_client_random() and SSL_get_server_random() were added in OpenSSL
  67  * 1.1.0 and newer BoringSSL revisions. Provide compatibility wrappers for
  68  * older versions.
  69  */
  70
  71 static size_t SSL_get_client_random(const SSL *ssl, unsigned char *out,
  72                                     size_t outlen)
  73 {
  74         if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE)
  75                 return 0;
  76         os_memcpy(out, ssl->s3->client_random, SSL3_RANDOM_SIZE);
  77         return SSL3_RANDOM_SIZE;
  78 }
  79
  80
  81 static size_t SSL_get_server_random(const SSL *ssl, unsigned char *out,
  82                                     size_t outlen)
  83 {
  84         if (!ssl->s3 || outlen < SSL3_RANDOM_SIZE)
  85                 return 0;
  86         os_memcpy(out, ssl->s3->server_random, SSL3_RANDOM_SIZE);
  87         return SSL3_RANDOM_SIZE;
  88 }
  89
  90
  91 #ifdef OPENSSL_NEED_EAP_FAST_PRF
  92 static size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
  93                                          unsigned char *out, size_t outlen)
  94 {
  95         if (!session || session->master_key_length < 0 ||
  96             (size_t) session->master_key_length > outlen)
  97                 return 0;
  98         if ((size_t) session->master_key_length < outlen)
  99                 outlen = session->master_key_length;
 100         os_memcpy(out, session->master_key, outlen);
 101         return outlen;
 102 }
 103 #endif /* OPENSSL_NEED_EAP_FAST_PRF */
 104
 105 #endif
 106
 107 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
 108         (defined(LIBRESSL_VERSION_NUMBER) && \
 109          LIBRESSL_VERSION_NUMBER < 0x20700000L)
 110 #ifdef CONFIG_SUITEB
 111 static int RSA_bits(const RSA *r)
 112 {
 113         return BN_num_bits(r->n);
 114 }
 115 #endif /* CONFIG_SUITEB */
 116
 117
 118 static const unsigned char * ASN1_STRING_get0_data(const ASN1_STRING *x)
 119 {
 120         return ASN1_STRING_data((ASN1_STRING *) x);
 121 }
 122 #endif
 123
 124 #ifdef ANDROID
 125 #include <openssl/pem.h>
 126 #include <keystore/keystore_get.h>
 127
 128 static BIO * BIO_from_keystore(const char *key)
 129 {
 130         BIO *bio = NULL;
 131         uint8_t *value = NULL;
 132         int length = keystore_get(key, strlen(key), &value);
 133         if (length != -1 && (bio = BIO_new(BIO_s_mem())) != NULL)
 134                 BIO_write(bio, value, length);
 135         free(value);
 136         return bio;
 137 }
 138
 139
 140 static int tls_add_ca_from_keystore(X509_STORE *ctx, const char *key_alias)
 141 {
 142         BIO *bio = BIO_from_keystore(key_alias);
 143         STACK_OF(X509_INFO) *stack = NULL;
 144         stack_index_t i;
 145
 146         if (bio) {
 147                 stack = PEM_X509_INFO_read_bio(bio, NULL, NULL, NULL);
 148                 BIO_free(bio);
 149         }
 150
 151         if (!stack) {
 152                 wpa_printf(MSG_WARNING, "TLS: Failed to parse certificate: %s",
 153                            key_alias);
 154                 return -1;
 155         }
 156
 157         for (i = 0; i < sk_X509_INFO_num(stack); ++i) {
 158                 X509_INFO *info = sk_X509_INFO_value(stack, i);
 159
 160                 if (info->x509)
 161                         X509_STORE_add_cert(ctx, info->x509);
 162                 if (info->crl)
 163                         X509_STORE_add_crl(ctx, info->crl);
 164         }
 165
 166         sk_X509_INFO_pop_free(stack, X509_INFO_free);
 167
 168         return 0;
 169 }
 170
 171
 172 static int tls_add_ca_from_keystore_encoded(X509_STORE *ctx,
 173                                             const char *encoded_key_alias)
 174 {
 175         int rc = -1;
 176         int len = os_strlen(encoded_key_alias);
 177         unsigned char *decoded_alias;
 178
 179         if (len & 1) {
 180                 wpa_printf(MSG_WARNING, "Invalid hex-encoded alias: %s",
 181                            encoded_key_alias);
 182                 return rc;
 183         }
 184
 185         decoded_alias = os_malloc(len / 2 + 1);
 186         if (decoded_alias) {
 187                 if (!hexstr2bin(encoded_key_alias, decoded_alias, len / 2)) {
 188                         decoded_alias[len / 2] = '\0';
 189                         rc = tls_add_ca_from_keystore(
 190                                 ctx, (const char *) decoded_alias);
 191                 }
 192                 os_free(decoded_alias);
 193         }
 194
 195         return rc;
 196 }
 197
 198 #endif /* ANDROID */
 199
 200 static int tls_openssl_ref_count = 0;
 201 static int tls_ex_idx_session = -1;
 202
 203 struct tls_context {
 204         void (*event_cb)(void *ctx, enum tls_event ev,
 205                          union tls_event_data *data);
 206         void *cb_ctx;
 207         int cert_in_cb;
 208         char *ocsp_stapling_response;
 209 };
 210
 211 static struct tls_context *tls_global = NULL;
 212
 213
 214 struct tls_data {
 215         SSL_CTX *ssl;
 216         unsigned int tls_session_lifetime;
 217         int check_crl;
 218         int check_crl_strict;
 219         char *ca_cert;
 220         unsigned int crl_reload_interval;
 221         struct os_reltime crl_last_reload;
 222         char *check_cert_subject;
 223 };
 224
 225 struct tls_connection {
 226         struct tls_context *context;
 227         struct tls_data *data;
 228         SSL_CTX *ssl_ctx;
 229         SSL *ssl;
 230         BIO *ssl_in, *ssl_out;
 231 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
 232         ENGINE *engine;        /* functional reference to the engine */
 233         EVP_PKEY *private_key; /* the private key if using engine */
 234 #endif /* OPENSSL_NO_ENGINE */
 235         char *subject_match, *altsubject_match, *suffix_match, *domain_match;
 236         char *check_cert_subject;
 237         int read_alerts, write_alerts, failed;
 238
 239         tls_session_ticket_cb session_ticket_cb;
 240         void *session_ticket_cb_ctx;
 241
 242         /* SessionTicket received from OpenSSL hello_extension_cb (server) */
 243         u8 *session_ticket;
 244         size_t session_ticket_len;
 245
 246         unsigned int ca_cert_verify:1;
 247         unsigned int cert_probe:1;
 248         unsigned int server_cert_only:1;
 249         unsigned int invalid_hb_used:1;
 250         unsigned int success_data:1;
 251         unsigned int client_hello_generated:1;
 252         unsigned int server:1;
 253
 254         u8 srv_cert_hash[32];
 255
 256         unsigned int flags;
 257
 258         X509 *peer_cert;
 259         X509 *peer_issuer;
 260         X509 *peer_issuer_issuer;
 261
 262         unsigned char client_random[SSL3_RANDOM_SIZE];
 263         unsigned char server_random[SSL3_RANDOM_SIZE];
 264
 265         u16 cipher_suite;
 266         int server_dh_prime_len;
 267 };
 268
 269
 270 static struct tls_context * tls_context_new(const struct tls_config *conf)
 271 {
 272         struct tls_context *context = os_zalloc(sizeof(*context));
 273         if (context == NULL)
 274                 return NULL;
 275         if (conf) {
 276                 context->event_cb = conf->event_cb;
 277                 context->cb_ctx = conf->cb_ctx;
 278                 context->cert_in_cb = conf->cert_in_cb;
 279         }
 280         return context;
 281 }
 282
 283
 284 #ifdef CONFIG_NO_STDOUT_DEBUG
 285
 286 static void _tls_show_errors(void)
 287 {
 288         unsigned long err;
 289
 290         while ((err = ERR_get_error())) {
 291                 /* Just ignore the errors, since stdout is disabled */
 292         }
 293 }
 294 #define tls_show_errors(l, f, t) _tls_show_errors()
 295
 296 #else /* CONFIG_NO_STDOUT_DEBUG */
 297
 298 static void tls_show_errors(int level, const char *func, const char *txt)
 299 {
 300         unsigned long err;
 301
 302         wpa_printf(level, "OpenSSL: %s - %s %s",
 303                    func, txt, ERR_error_string(ERR_get_error(), NULL));
 304
 305         while ((err = ERR_get_error())) {
 306                 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
 307                            ERR_error_string(err, NULL));
 308         }
 309 }
 310
 311 #endif /* CONFIG_NO_STDOUT_DEBUG */
 312
 313
 314 static X509_STORE * tls_crl_cert_reload(const char *ca_cert, int check_crl)
 315 {
 316         int flags;
 317         X509_STORE *store;
 318
 319         store = X509_STORE_new();
 320         if (!store) {
 321                 wpa_printf(MSG_DEBUG,
 322                            "OpenSSL: %s - failed to allocate new certificate store",
 323                            __func__);
 324                 return NULL;
 325         }
 326
 327         if (ca_cert && X509_STORE_load_locations(store, ca_cert, NULL) != 1) {
 328                 tls_show_errors(MSG_WARNING, __func__,
 329                                 "Failed to load root certificates");
 330                 X509_STORE_free(store);
 331                 return NULL;
 332         }
 333
 334         flags = check_crl ? X509_V_FLAG_CRL_CHECK : 0;
 335         if (check_crl == 2)
 336                 flags |= X509_V_FLAG_CRL_CHECK_ALL;
 337
 338         X509_STORE_set_flags(store, flags);
 339
 340         return store;
 341 }
 342
 343
 344 #ifdef CONFIG_NATIVE_WINDOWS
 345
 346 /* Windows CryptoAPI and access to certificate stores */
 347 #include <wincrypt.h>
 348
 349 #ifdef __MINGW32_VERSION
 350 /*
 351  * MinGW does not yet include all the needed definitions for CryptoAPI, so
 352  * define here whatever extra is needed.
 353  */
 354 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
 355 #define CERT_STORE_READONLY_FLAG 0x00008000
 356 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
 357
 358 #endif /* __MINGW32_VERSION */
 359
 360
 361 struct cryptoapi_rsa_data {
 362         const CERT_CONTEXT *cert;
 363         HCRYPTPROV crypt_prov;
 364         DWORD key_spec;
 365         BOOL free_crypt_prov;
 366 };
 367
 368
 369 static void cryptoapi_error(const char *msg)
 370 {
 371         wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
 372                    msg, (unsigned int) GetLastError());
 373 }
 374
 375
 376 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
 377                                  unsigned char *to, RSA *rsa, int padding)
 378 {
 379         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 380         return 0;
 381 }
 382
 383
 384 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
 385                                  unsigned char *to, RSA *rsa, int padding)
 386 {
 387         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 388         return 0;
 389 }
 390
 391
 392 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
 393                                   unsigned char *to, RSA *rsa, int padding)
 394 {
 395         struct cryptoapi_rsa_data *priv =
 396                 (struct cryptoapi_rsa_data *) rsa->meth->app_data;
 397         HCRYPTHASH hash;
 398         DWORD hash_size, len, i;
 399         unsigned char *buf = NULL;
 400         int ret = 0;
 401
 402         if (priv == NULL) {
 403                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 404                        ERR_R_PASSED_NULL_PARAMETER);
 405                 return 0;
 406         }
 407
 408         if (padding != RSA_PKCS1_PADDING) {
 409                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 410                        RSA_R_UNKNOWN_PADDING_TYPE);
 411                 return 0;
 412         }
 413
 414         if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
 415                 wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
 416                            __func__);
 417                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 418                        RSA_R_INVALID_MESSAGE_LENGTH);
 419                 return 0;
 420         }
 421
 422         if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
 423         {
 424                 cryptoapi_error("CryptCreateHash failed");
 425                 return 0;
 426         }
 427
 428         len = sizeof(hash_size);
 429         if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
 430                                0)) {
 431                 cryptoapi_error("CryptGetHashParam failed");
 432                 goto err;
 433         }
 434
 435         if ((int) hash_size != flen) {
 436                 wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
 437                            (unsigned) hash_size, flen);
 438                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 439                        RSA_R_INVALID_MESSAGE_LENGTH);
 440                 goto err;
 441         }
 442         if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
 443                 cryptoapi_error("CryptSetHashParam failed");
 444                 goto err;
 445         }
 446
 447         len = RSA_size(rsa);
 448         buf = os_malloc(len);
 449         if (buf == NULL) {
 450                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
 451                 goto err;
 452         }
 453
 454         if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
 455                 cryptoapi_error("CryptSignHash failed");
 456                 goto err;
 457         }
 458
 459         for (i = 0; i < len; i++)
 460                 to[i] = buf[len - i - 1];
 461         ret = len;
 462
 463 err:
 464         os_free(buf);
 465         CryptDestroyHash(hash);
 466
 467         return ret;
 468 }
 469
 470
 471 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
 472                                   unsigned char *to, RSA *rsa, int padding)
 473 {
 474         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 475         return 0;
 476 }
 477
 478
 479 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
 480 {
 481         if (priv == NULL)
 482                 return;
 483         if (priv->crypt_prov && priv->free_crypt_prov)
 484                 CryptReleaseContext(priv->crypt_prov, 0);
 485         if (priv->cert)
 486                 CertFreeCertificateContext(priv->cert);
 487         os_free(priv);
 488 }
 489
 490
 491 static int cryptoapi_finish(RSA *rsa)
 492 {
 493         cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
 494         os_free((void *) rsa->meth);
 495         rsa->meth = NULL;
 496         return 1;
 497 }
 498
 499
 500 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
 501 {
 502         HCERTSTORE cs;
 503         const CERT_CONTEXT *ret = NULL;
 504
 505         cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
 506                            store | CERT_STORE_OPEN_EXISTING_FLAG |
 507                            CERT_STORE_READONLY_FLAG, L"MY");
 508         if (cs == NULL) {
 509                 cryptoapi_error("Failed to open 'My system store'");
 510                 return NULL;
 511         }
 512
 513         if (strncmp(name, "cert://", 7) == 0) {
 514                 unsigned short wbuf[255];
 515                 MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
 516                 ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
 517                                                  PKCS_7_ASN_ENCODING,
 518                                                  0, CERT_FIND_SUBJECT_STR,
 519                                                  wbuf, NULL);
 520         } else if (strncmp(name, "hash://", 7) == 0) {
 521                 CRYPT_HASH_BLOB blob;
 522                 int len;
 523                 const char *hash = name + 7;
 524                 unsigned char *buf;
 525
 526                 len = os_strlen(hash) / 2;
 527                 buf = os_malloc(len);
 528                 if (buf && hexstr2bin(hash, buf, len) == 0) {
 529                         blob.cbData = len;
 530                         blob.pbData = buf;
 531                         ret = CertFindCertificateInStore(cs,
 532                                                          X509_ASN_ENCODING |
 533                                                          PKCS_7_ASN_ENCODING,
 534                                                          0, CERT_FIND_HASH,
 535                                                          &blob, NULL);
 536                 }
 537                 os_free(buf);
 538         }
 539
 540         CertCloseStore(cs, 0);
 541
 542         return ret;
 543 }
 544
 545
 546 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 547 {
 548         X509 *cert = NULL;
 549         RSA *rsa = NULL, *pub_rsa;
 550         struct cryptoapi_rsa_data *priv;
 551         RSA_METHOD *rsa_meth;
 552
 553         if (name == NULL ||
 554             (strncmp(name, "cert://", 7) != 0 &&
 555              strncmp(name, "hash://", 7) != 0))
 556                 return -1;
 557
 558         priv = os_zalloc(sizeof(*priv));
 559         rsa_meth = os_zalloc(sizeof(*rsa_meth));
 560         if (priv == NULL || rsa_meth == NULL) {
 561                 wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
 562                            "for CryptoAPI RSA method");
 563                 os_free(priv);
 564                 os_free(rsa_meth);
 565                 return -1;
 566         }
 567
 568         priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
 569         if (priv->cert == NULL) {
 570                 priv->cert = cryptoapi_find_cert(
 571                         name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
 572         }
 573         if (priv->cert == NULL) {
 574                 wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
 575                            "'%s'", name);
 576                 goto err;
 577         }
 578
 579         cert = d2i_X509(NULL,
 580                         (const unsigned char **) &priv->cert->pbCertEncoded,
 581                         priv->cert->cbCertEncoded);
 582         if (cert == NULL) {
 583                 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
 584                            "encoding");
 585                 goto err;
 586         }
 587
 588         if (!CryptAcquireCertificatePrivateKey(priv->cert,
 589                                                CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
 590                                                NULL, &priv->crypt_prov,
 591                                                &priv->key_spec,
 592                                                &priv->free_crypt_prov)) {
 593                 cryptoapi_error("Failed to acquire a private key for the "
 594                                 "certificate");
 595                 goto err;
 596         }
 597
 598         rsa_meth->name = "Microsoft CryptoAPI RSA Method";
 599         rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
 600         rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
 601         rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
 602         rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
 603         rsa_meth->finish = cryptoapi_finish;
 604         rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
 605         rsa_meth->app_data = (char *) priv;
 606
 607         rsa = RSA_new();
 608         if (rsa == NULL) {
 609                 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
 610                        ERR_R_MALLOC_FAILURE);
 611                 goto err;
 612         }
 613
 614         if (!SSL_use_certificate(ssl, cert)) {
 615                 RSA_free(rsa);
 616                 rsa = NULL;
 617                 goto err;
 618         }
 619         pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
 620         X509_free(cert);
 621         cert = NULL;
 622
 623         rsa->n = BN_dup(pub_rsa->n);
 624         rsa->e = BN_dup(pub_rsa->e);
 625         if (!RSA_set_method(rsa, rsa_meth))
 626                 goto err;
 627
 628         if (!SSL_use_RSAPrivateKey(ssl, rsa))
 629                 goto err;
 630         RSA_free(rsa);
 631
 632         return 0;
 633
 634 err:
 635         if (cert)
 636                 X509_free(cert);
 637         if (rsa)
 638                 RSA_free(rsa);
 639         else {
 640                 os_free(rsa_meth);
 641                 cryptoapi_free_data(priv);
 642         }
 643         return -1;
 644 }
 645
 646
 647 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
 648 {
 649         HCERTSTORE cs;
 650         PCCERT_CONTEXT ctx = NULL;
 651         X509 *cert;
 652         char buf[128];
 653         const char *store;
 654 #ifdef UNICODE
 655         WCHAR *wstore;
 656 #endif /* UNICODE */
 657
 658         if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
 659                 return -1;
 660
 661         store = name + 13;
 662 #ifdef UNICODE
 663         wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
 664         if (wstore == NULL)
 665                 return -1;
 666         wsprintf(wstore, L"%S", store);
 667         cs = CertOpenSystemStore(0, wstore);
 668         os_free(wstore);
 669 #else /* UNICODE */
 670         cs = CertOpenSystemStore(0, store);
 671 #endif /* UNICODE */
 672         if (cs == NULL) {
 673                 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
 674                            "'%s': error=%d", __func__, store,
 675                            (int) GetLastError());
 676                 return -1;
 677         }
 678
 679         while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
 680                 cert = d2i_X509(NULL,
 681                                 (const unsigned char **) &ctx->pbCertEncoded,
 682                                 ctx->cbCertEncoded);
 683                 if (cert == NULL) {
 684                         wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
 685                                    "X509 DER encoding for CA cert");
 686                         continue;
 687                 }
 688
 689                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
 690                                   sizeof(buf));
 691                 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
 692                            "system certificate store: subject='%s'", buf);
 693
 694                 if (!X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx),
 695                                          cert)) {
 696                         tls_show_errors(MSG_WARNING, __func__,
 697                                         "Failed to add ca_cert to OpenSSL "
 698                                         "certificate store");
 699                 }
 700
 701                 X509_free(cert);
 702         }
 703
 704         if (!CertCloseStore(cs, 0)) {
 705                 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
 706                            "'%s': error=%d", __func__, name + 13,
 707                            (int) GetLastError());
 708         }
 709
 710         return 0;
 711 }
 712
 713
 714 #else /* CONFIG_NATIVE_WINDOWS */
 715
 716 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 717 {
 718         return -1;
 719 }
 720
 721 #endif /* CONFIG_NATIVE_WINDOWS */
 722
 723
 724 static void ssl_info_cb(const SSL *ssl, int where, int ret)
 725 {
 726         const char *str;
 727         int w;
 728
 729         wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
 730         w = where & ~SSL_ST_MASK;
 731         if (w & SSL_ST_CONNECT)
 732                 str = "SSL_connect";
 733         else if (w & SSL_ST_ACCEPT)
 734                 str = "SSL_accept";
 735         else
 736                 str = "undefined";
 737
 738         if (where & SSL_CB_LOOP) {
 739                 wpa_printf(MSG_DEBUG, "SSL: %s:%s",
 740                            str, SSL_state_string_long(ssl));
 741         } else if (where & SSL_CB_ALERT) {
 742                 struct tls_connection *conn = SSL_get_app_data((SSL *) ssl);
 743                 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
 744                            where & SSL_CB_READ ?
 745                            "read (remote end reported an error)" :
 746                            "write (local SSL3 detected an error)",
 747                            SSL_alert_type_string_long(ret),
 748                            SSL_alert_desc_string_long(ret));
 749                 if ((ret >> 8) == SSL3_AL_FATAL) {
 750                         if (where & SSL_CB_READ)
 751                                 conn->read_alerts++;
 752                         else
 753                                 conn->write_alerts++;
 754                 }
 755                 if (conn->context->event_cb != NULL) {
 756                         union tls_event_data ev;
 757                         struct tls_context *context = conn->context;
 758                         os_memset(&ev, 0, sizeof(ev));
 759                         ev.alert.is_local = !(where & SSL_CB_READ);
 760                         ev.alert.type = SSL_alert_type_string_long(ret);
 761                         ev.alert.description = SSL_alert_desc_string_long(ret);
 762                         context->event_cb(context->cb_ctx, TLS_ALERT, &ev);
 763                 }
 764         } else if (where & SSL_CB_EXIT && ret <= 0) {
 765                 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
 766                            str, ret == 0 ? "failed" : "error",
 767                            SSL_state_string_long(ssl));
 768         }
 769 }
 770
 771
 772 #ifndef OPENSSL_NO_ENGINE
 773 /**
 774  * tls_engine_load_dynamic_generic - load any openssl engine
 775  * @pre: an array of commands and values that load an engine initialized
 776  *       in the engine specific function
 777  * @post: an array of commands and values that initialize an already loaded
 778  *        engine (or %NULL if not required)
 779  * @id: the engine id of the engine to load (only required if post is not %NULL
 780  *
 781  * This function is a generic function that loads any openssl engine.
 782  *
 783  * Returns: 0 on success, -1 on failure
 784  */
 785 static int tls_engine_load_dynamic_generic(const char *pre[],
 786                                            const char *post[], const char *id)
 787 {
 788         ENGINE *engine;
 789         const char *dynamic_id = "dynamic";
 790
 791         engine = ENGINE_by_id(id);
 792         if (engine) {
 793                 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
 794                            "available", id);
 795                 /*
 796                  * If it was auto-loaded by ENGINE_by_id() we might still
 797                  * need to tell it which PKCS#11 module to use in legacy
 798                  * (non-p11-kit) environments. Do so now; even if it was
 799                  * properly initialised before, setting it again will be
 800                  * harmless.
 801                  */
 802                 goto found;
 803         }
 804         ERR_clear_error();
 805
 806         engine = ENGINE_by_id(dynamic_id);
 807         if (engine == NULL) {
 808                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 809                            dynamic_id,
 810                            ERR_error_string(ERR_get_error(), NULL));
 811                 return -1;
 812         }
 813
 814         /* Perform the pre commands. This will load the engine. */
 815         while (pre && pre[0]) {
 816                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
 817                 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
 818                         wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
 819                                    "%s %s [%s]", pre[0], pre[1],
 820                                    ERR_error_string(ERR_get_error(), NULL));
 821                         ENGINE_free(engine);
 822                         return -1;
 823                 }
 824                 pre += 2;
 825         }
 826
 827         /*
 828          * Free the reference to the "dynamic" engine. The loaded engine can
 829          * now be looked up using ENGINE_by_id().
 830          */
 831         ENGINE_free(engine);
 832
 833         engine = ENGINE_by_id(id);
 834         if (engine == NULL) {
 835                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 836                            id, ERR_error_string(ERR_get_error(), NULL));
 837                 return -1;
 838         }
 839  found:
 840         while (post && post[0]) {
 841                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
 842                 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
 843                         wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
 844                                 " %s %s [%s]", post[0], post[1],
 845                                    ERR_error_string(ERR_get_error(), NULL));
 846                         ENGINE_remove(engine);
 847                         ENGINE_free(engine);
 848                         return -1;
 849                 }
 850                 post += 2;
 851         }
 852         ENGINE_free(engine);
 853
 854         return 0;
 855 }
 856
 857
 858 /**
 859  * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
 860  * @pkcs11_so_path: pksc11_so_path from the configuration
 861  * @pcks11_module_path: pkcs11_module_path from the configuration
 862  */
 863 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
 864                                           const char *pkcs11_module_path)
 865 {
 866         char *engine_id = "pkcs11";
 867         const char *pre_cmd[] = {
 868                 "SO_PATH", NULL /* pkcs11_so_path */,
 869                 "ID", NULL /* engine_id */,
 870                 "LIST_ADD", "1",
 871                 /* "NO_VCHECK", "1", */
 872                 "LOAD", NULL,
 873                 NULL, NULL
 874         };
 875         const char *post_cmd[] = {
 876                 "MODULE_PATH", NULL /* pkcs11_module_path */,
 877                 NULL, NULL
 878         };
 879
 880         if (!pkcs11_so_path)
 881                 return 0;
 882
 883         pre_cmd[1] = pkcs11_so_path;
 884         pre_cmd[3] = engine_id;
 885         if (pkcs11_module_path)
 886                 post_cmd[1] = pkcs11_module_path;
 887         else
 888                 post_cmd[0] = NULL;
 889
 890         wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
 891                    pkcs11_so_path);
 892
 893         return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
 894 }
 895
 896
 897 /**
 898  * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
 899  * @opensc_so_path: opensc_so_path from the configuration
 900  */
 901 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
 902 {
 903         char *engine_id = "opensc";
 904         const char *pre_cmd[] = {
 905                 "SO_PATH", NULL /* opensc_so_path */,
 906                 "ID", NULL /* engine_id */,
 907                 "LIST_ADD", "1",
 908                 "LOAD", NULL,
 909                 NULL, NULL
 910         };
 911
 912         if (!opensc_so_path)
 913                 return 0;
 914
 915         pre_cmd[1] = opensc_so_path;
 916         pre_cmd[3] = engine_id;
 917
 918         wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
 919                    opensc_so_path);
 920
 921         return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
 922 }
 923 #endif /* OPENSSL_NO_ENGINE */
 924
 925
 926 static void remove_session_cb(SSL_CTX *ctx, SSL_SESSION *sess)
 927 {
 928         struct wpabuf *buf;
 929
 930         if (tls_ex_idx_session < 0)
 931                 return;
 932         buf = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
 933         if (!buf)
 934                 return;
 935         wpa_printf(MSG_DEBUG,
 936                    "OpenSSL: Free application session data %p (sess %p)",
 937                    buf, sess);
 938         wpabuf_free(buf);
 939
 940         SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, NULL);
 941 }
 942
 943
 944 void * tls_init(const struct tls_config *conf)
 945 {
 946         struct tls_data *data;
 947         SSL_CTX *ssl;
 948         struct tls_context *context;
 949         const char *ciphers;
 950
 951         if (tls_openssl_ref_count == 0) {
 952                 tls_global = context = tls_context_new(conf);
 953                 if (context == NULL)
 954                         return NULL;
 955 #ifdef CONFIG_FIPS
 956 #ifdef OPENSSL_FIPS
 957                 if (conf && conf->fips_mode) {
 958                         static int fips_enabled = 0;
 959
 960                         if (!fips_enabled && !FIPS_mode_set(1)) {
 961                                 wpa_printf(MSG_ERROR, "Failed to enable FIPS "
 962                                            "mode");
 963                                 ERR_load_crypto_strings();
 964                                 ERR_print_errors_fp(stderr);
 965                                 os_free(tls_global);
 966                                 tls_global = NULL;
 967                                 return NULL;
 968                         } else {
 969                                 wpa_printf(MSG_INFO, "Running in FIPS mode");
 970                                 fips_enabled = 1;
 971                         }
 972                 }
 973 #else /* OPENSSL_FIPS */
 974                 if (conf && conf->fips_mode) {
 975                         wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
 976                                    "supported");
 977                         os_free(tls_global);
 978                         tls_global = NULL;
 979                         return NULL;
 980                 }
 981 #endif /* OPENSSL_FIPS */
 982 #endif /* CONFIG_FIPS */
 983 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
 984         (defined(LIBRESSL_VERSION_NUMBER) && \
 985          LIBRESSL_VERSION_NUMBER < 0x20700000L)
 986                 SSL_load_error_strings();
 987                 SSL_library_init();
 988 #ifndef OPENSSL_NO_SHA256
 989                 EVP_add_digest(EVP_sha256());
 990 #endif /* OPENSSL_NO_SHA256 */
 991                 /* TODO: if /dev/urandom is available, PRNG is seeded
 992                  * automatically. If this is not the case, random data should
 993                  * be added here. */
 994
 995 #ifdef PKCS12_FUNCS
 996 #ifndef OPENSSL_NO_RC2
 997                 /*
 998                  * 40-bit RC2 is commonly used in PKCS#12 files, so enable it.
 999                  * This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8
1000                  * versions, but it looks like OpenSSL 1.0.0 does not do that
1001                  * anymore.
1002                  */
1003                 EVP_add_cipher(EVP_rc2_40_cbc());
1004 #endif /* OPENSSL_NO_RC2 */
1005                 PKCS12_PBE_add();
1006 #endif  /* PKCS12_FUNCS */
1007 #endif /* < 1.1.0 */
1008         } else {
1009                 context = tls_context_new(conf);
1010                 if (context == NULL)
1011                         return NULL;
1012         }
1013         tls_openssl_ref_count++;
1014
1015         data = os_zalloc(sizeof(*data));
1016         if (data)
1017                 ssl = SSL_CTX_new(SSLv23_method());
1018         else
1019                 ssl = NULL;
1020         if (ssl == NULL) {
1021                 tls_openssl_ref_count--;
1022                 if (context != tls_global)
1023                         os_free(context);
1024                 if (tls_openssl_ref_count == 0) {
1025                         os_free(tls_global);
1026                         tls_global = NULL;
1027                 }
1028                 os_free(data);
1029                 return NULL;
1030         }
1031         data->ssl = ssl;
1032         if (conf) {
1033                 data->tls_session_lifetime = conf->tls_session_lifetime;
1034                 data->crl_reload_interval = conf->crl_reload_interval;
1035         }
1036
1037         SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv2);
1038         SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv3);
1039
1040 #ifdef SSL_MODE_NO_AUTO_CHAIN
1041         /* Number of deployed use cases assume the default OpenSSL behavior of
1042          * auto chaining the local certificate is in use. BoringSSL removed this
1043          * functionality by default, so we need to restore it here to avoid
1044          * breaking existing use cases. */
1045         SSL_CTX_clear_mode(ssl, SSL_MODE_NO_AUTO_CHAIN);
1046 #endif /* SSL_MODE_NO_AUTO_CHAIN */
1047
1048         SSL_CTX_set_info_callback(ssl, ssl_info_cb);
1049         SSL_CTX_set_app_data(ssl, context);
1050         if (data->tls_session_lifetime > 0) {
1051                 SSL_CTX_set_quiet_shutdown(ssl, 1);
1052                 /*
1053                  * Set default context here. In practice, this will be replaced
1054                  * by the per-EAP method context in tls_connection_set_verify().
1055                  */
1056                 SSL_CTX_set_session_id_context(ssl, (u8 *) "hostapd", 7);
1057                 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_SERVER);
1058                 SSL_CTX_set_timeout(ssl, data->tls_session_lifetime);
1059                 SSL_CTX_sess_set_remove_cb(ssl, remove_session_cb);
1060         } else {
1061                 SSL_CTX_set_session_cache_mode(ssl, SSL_SESS_CACHE_OFF);
1062         }
1063
1064         if (tls_ex_idx_session < 0) {
1065                 tls_ex_idx_session = SSL_SESSION_get_ex_new_index(
1066                         0, NULL, NULL, NULL, NULL);
1067                 if (tls_ex_idx_session < 0) {
1068                         tls_deinit(data);
1069                         return NULL;
1070                 }
1071         }
1072
1073 #ifndef OPENSSL_NO_ENGINE
1074         wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
1075 #if OPENSSL_VERSION_NUMBER < 0x10100000L
1076         ERR_load_ENGINE_strings();
1077         ENGINE_load_dynamic();
1078 #endif /* OPENSSL_VERSION_NUMBER */
1079
1080         if (conf &&
1081             (conf->opensc_engine_path || conf->pkcs11_engine_path ||
1082              conf->pkcs11_module_path)) {
1083                 if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
1084                     tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
1085                                                    conf->pkcs11_module_path)) {
1086                         tls_deinit(data);
1087                         return NULL;
1088                 }
1089         }
1090 #endif /* OPENSSL_NO_ENGINE */
1091
1092         if (conf && conf->openssl_ciphers)
1093                 ciphers = conf->openssl_ciphers;
1094         else
1095                 ciphers = TLS_DEFAULT_CIPHERS;
1096         if (SSL_CTX_set_cipher_list(ssl, ciphers) != 1) {
1097                 wpa_printf(MSG_ERROR,
1098                            "OpenSSL: Failed to set cipher string '%s'",
1099                            ciphers);
1100                 tls_deinit(data);
1101                 return NULL;
1102         }
1103
1104         return data;
1105 }
1106
1107
1108 void tls_deinit(void *ssl_ctx)
1109 {
1110         struct tls_data *data = ssl_ctx;
1111         SSL_CTX *ssl = data->ssl;
1112         struct tls_context *context = SSL_CTX_get_app_data(ssl);
1113         if (context != tls_global)
1114                 os_free(context);
1115         if (data->tls_session_lifetime > 0)
1116                 SSL_CTX_flush_sessions(ssl, 0);
1117         os_free(data->ca_cert);
1118         SSL_CTX_free(ssl);
1119
1120         tls_openssl_ref_count--;
1121         if (tls_openssl_ref_count == 0) {
1122 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
1123         (defined(LIBRESSL_VERSION_NUMBER) && \
1124          LIBRESSL_VERSION_NUMBER < 0x20700000L)
1125 #ifndef OPENSSL_NO_ENGINE
1126                 ENGINE_cleanup();
1127 #endif /* OPENSSL_NO_ENGINE */
1128                 CRYPTO_cleanup_all_ex_data();
1129                 ERR_remove_thread_state(NULL);
1130                 ERR_free_strings();
1131                 EVP_cleanup();
1132 #endif /* < 1.1.0 */
1133                 os_free(tls_global->ocsp_stapling_response);
1134                 tls_global->ocsp_stapling_response = NULL;
1135                 os_free(tls_global);
1136                 tls_global = NULL;
1137         }
1138
1139         os_free(data->check_cert_subject);
1140         os_free(data);
1141 }
1142
1143
1144 #ifndef OPENSSL_NO_ENGINE
1145
1146 /* Cryptoki return values */
1147 #define CKR_PIN_INCORRECT 0x000000a0
1148 #define CKR_PIN_INVALID 0x000000a1
1149 #define CKR_PIN_LEN_RANGE 0x000000a2
1150
1151 /* libp11 */
1152 #define ERR_LIB_PKCS11  ERR_LIB_USER
1153
1154 static int tls_is_pin_error(unsigned int err)
1155 {
1156         return ERR_GET_LIB(err) == ERR_LIB_PKCS11 &&
1157                 (ERR_GET_REASON(err) == CKR_PIN_INCORRECT ||
1158                  ERR_GET_REASON(err) == CKR_PIN_INVALID ||
1159                  ERR_GET_REASON(err) == CKR_PIN_LEN_RANGE);
1160 }
1161
1162 #endif /* OPENSSL_NO_ENGINE */
1163
1164
1165 #ifdef ANDROID
1166 /* EVP_PKEY_from_keystore comes from system/security/keystore-engine. */
1167 EVP_PKEY * EVP_PKEY_from_keystore(const char *key_id);
1168 #endif /* ANDROID */
1169
1170 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
1171                            const char *pin, const char *key_id,
1172                            const char *cert_id, const char *ca_cert_id)
1173 {
1174 #if defined(ANDROID) && defined(OPENSSL_IS_BORINGSSL)
1175 #if !defined(OPENSSL_NO_ENGINE)
1176 #error "This code depends on OPENSSL_NO_ENGINE being defined by BoringSSL."
1177 #endif
1178         if (!key_id)
1179                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1180         conn->engine = NULL;
1181         conn->private_key = EVP_PKEY_from_keystore(key_id);
1182         if (!conn->private_key) {
1183                 wpa_printf(MSG_ERROR,
1184                            "ENGINE: cannot load private key with id '%s' [%s]",
1185                            key_id,
1186                            ERR_error_string(ERR_get_error(), NULL));
1187                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1188         }
1189 #endif /* ANDROID && OPENSSL_IS_BORINGSSL */
1190
1191 #ifndef OPENSSL_NO_ENGINE
1192         int ret = -1;
1193         if (engine_id == NULL) {
1194                 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
1195                 return -1;
1196         }
1197
1198         ERR_clear_error();
1199 #ifdef ANDROID
1200         ENGINE_load_dynamic();
1201 #endif
1202         conn->engine = ENGINE_by_id(engine_id);
1203         if (!conn->engine) {
1204                 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
1205                            engine_id, ERR_error_string(ERR_get_error(), NULL));
1206                 goto err;
1207         }
1208         if (ENGINE_init(conn->engine) != 1) {
1209                 wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
1210                            "(engine: %s) [%s]", engine_id,
1211                            ERR_error_string(ERR_get_error(), NULL));
1212                 goto err;
1213         }
1214         wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
1215
1216 #ifndef ANDROID
1217         if (pin && ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
1218                 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
1219                            ERR_error_string(ERR_get_error(), NULL));
1220                 goto err;
1221         }
1222 #endif
1223         if (key_id) {
1224                 /*
1225                  * Ensure that the ENGINE does not attempt to use the OpenSSL
1226                  * UI system to obtain a PIN, if we didn't provide one.
1227                  */
1228                 struct {
1229                         const void *password;
1230                         const char *prompt_info;
1231                 } key_cb = { "", NULL };
1232
1233                 /* load private key first in-case PIN is required for cert */
1234                 conn->private_key = ENGINE_load_private_key(conn->engine,
1235                                                             key_id, NULL,
1236                                                             &key_cb);
1237                 if (!conn->private_key) {
1238                         unsigned long err = ERR_get_error();
1239
1240                         wpa_printf(MSG_ERROR,
1241                                    "ENGINE: cannot load private key with id '%s' [%s]",
1242                                    key_id,
1243                                    ERR_error_string(err, NULL));
1244                         if (tls_is_pin_error(err))
1245                                 ret = TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
1246                         else
1247                                 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1248                         goto err;
1249                 }
1250         }
1251
1252         /* handle a certificate and/or CA certificate */
1253         if (cert_id || ca_cert_id) {
1254                 const char *cmd_name = "LOAD_CERT_CTRL";
1255
1256                 /* test if the engine supports a LOAD_CERT_CTRL */
1257                 if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
1258                                  0, (void *)cmd_name, NULL)) {
1259                         wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
1260                                    " loading certificates");
1261                         ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1262                         goto err;
1263                 }
1264         }
1265
1266         return 0;
1267
1268 err:
1269         if (conn->engine) {
1270                 ENGINE_free(conn->engine);
1271                 conn->engine = NULL;
1272         }
1273
1274         if (conn->private_key) {
1275                 EVP_PKEY_free(conn->private_key);
1276                 conn->private_key = NULL;
1277         }
1278
1279         return ret;
1280 #else /* OPENSSL_NO_ENGINE */
1281         return 0;
1282 #endif /* OPENSSL_NO_ENGINE */
1283 }
1284
1285
1286 static void tls_engine_deinit(struct tls_connection *conn)
1287 {
1288 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
1289         wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
1290         if (conn->private_key) {
1291                 EVP_PKEY_free(conn->private_key);
1292                 conn->private_key = NULL;
1293         }
1294         if (conn->engine) {
1295 #if !defined(OPENSSL_IS_BORINGSSL)
1296                 ENGINE_finish(conn->engine);
1297 #endif /* !OPENSSL_IS_BORINGSSL */
1298                 conn->engine = NULL;
1299         }
1300 #endif /* ANDROID || !OPENSSL_NO_ENGINE */
1301 }
1302
1303
1304 int tls_get_errors(void *ssl_ctx)
1305 {
1306         int count = 0;
1307         unsigned long err;
1308
1309         while ((err = ERR_get_error())) {
1310                 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
1311                            ERR_error_string(err, NULL));
1312                 count++;
1313         }
1314
1315         return count;
1316 }
1317
1318
1319 static const char * openssl_content_type(int content_type)
1320 {
1321         switch (content_type) {
1322         case 20:
1323                 return "change cipher spec";
1324         case 21:
1325                 return "alert";
1326         case 22:
1327                 return "handshake";
1328         case 23:
1329                 return "application data";
1330         case 24:
1331                 return "heartbeat";
1332         case 256:
1333                 return "TLS header info"; /* pseudo content type */
1334         default:
1335                 return "?";
1336         }
1337 }
1338
1339
1340 static const char * openssl_handshake_type(int content_type, const u8 *buf,
1341                                            size_t len)
1342 {
1343         if (content_type != 22 || !buf || len == 0)
1344                 return "";
1345         switch (buf[0]) {
1346         case 0:
1347                 return "hello request";
1348         case 1:
1349                 return "client hello";
1350         case 2:
1351                 return "server hello";
1352         case 3:
1353                 return "hello verify request";
1354         case 4:
1355                 return "new session ticket";
1356         case 5:
1357                 return "end of early data";
1358         case 6:
1359                 return "hello retry request";
1360         case 8:
1361                 return "encrypted extensions";
1362         case 11:
1363                 return "certificate";
1364         case 12:
1365                 return "server key exchange";
1366         case 13:
1367                 return "certificate request";
1368         case 14:
1369                 return "server hello done";
1370         case 15:
1371                 return "certificate verify";
1372         case 16:
1373                 return "client key exchange";
1374         case 20:
1375                 return "finished";
1376         case 21:
1377                 return "certificate url";
1378         case 22:
1379                 return "certificate status";
1380         case 23:
1381                 return "supplemental data";
1382         case 24:
1383                 return "key update";
1384         case 254:
1385                 return "message hash";
1386         default:
1387                 return "?";
1388         }
1389 }
1390
1391
1392 #ifdef CONFIG_SUITEB
1393
1394 static void check_server_hello(struct tls_connection *conn,
1395                                const u8 *pos, const u8 *end)
1396 {
1397         size_t payload_len, id_len;
1398
1399         /*
1400          * Parse ServerHello to get the selected cipher suite since OpenSSL does
1401          * not make it cleanly available during handshake and we need to know
1402          * whether DHE was selected.
1403          */
1404
1405         if (end - pos < 3)
1406                 return;
1407         payload_len = WPA_GET_BE24(pos);
1408         pos += 3;
1409
1410         if ((size_t) (end - pos) < payload_len)
1411                 return;
1412         end = pos + payload_len;
1413
1414         /* Skip Version and Random */
1415         if (end - pos < 2 + SSL3_RANDOM_SIZE)
1416                 return;
1417         pos += 2 + SSL3_RANDOM_SIZE;
1418
1419         /* Skip Session ID */
1420         if (end - pos < 1)
1421                 return;
1422         id_len = *pos++;
1423         if ((size_t) (end - pos) < id_len)
1424                 return;
1425         pos += id_len;
1426
1427         if (end - pos < 2)
1428                 return;
1429         conn->cipher_suite = WPA_GET_BE16(pos);
1430         wpa_printf(MSG_DEBUG, "OpenSSL: Server selected cipher suite 0x%x",
1431                    conn->cipher_suite);
1432 }
1433
1434
1435 static void check_server_key_exchange(SSL *ssl, struct tls_connection *conn,
1436                                       const u8 *pos, const u8 *end)
1437 {
1438         size_t payload_len;
1439         u16 dh_len;
1440         BIGNUM *p;
1441         int bits;
1442
1443         if (!(conn->flags & TLS_CONN_SUITEB))
1444                 return;
1445
1446         /* DHE is enabled only with DHE-RSA-AES256-GCM-SHA384 */
1447         if (conn->cipher_suite != 0x9f)
1448                 return;
1449
1450         if (end - pos < 3)
1451                 return;
1452         payload_len = WPA_GET_BE24(pos);
1453         pos += 3;
1454
1455         if ((size_t) (end - pos) < payload_len)
1456                 return;
1457         end = pos + payload_len;
1458
1459         if (end - pos < 2)
1460                 return;
1461         dh_len = WPA_GET_BE16(pos);
1462         pos += 2;
1463
1464         if ((size_t) (end - pos) < dh_len)
1465                 return;
1466         p = BN_bin2bn(pos, dh_len, NULL);
1467         if (!p)
1468                 return;
1469
1470         bits = BN_num_bits(p);
1471         BN_free(p);
1472
1473         conn->server_dh_prime_len = bits;
1474         wpa_printf(MSG_DEBUG, "OpenSSL: Server DH prime length: %d bits",
1475                    conn->server_dh_prime_len);
1476 }
1477
1478 #endif /* CONFIG_SUITEB */
1479
1480
1481 static void tls_msg_cb(int write_p, int version, int content_type,
1482                        const void *buf, size_t len, SSL *ssl, void *arg)
1483 {
1484         struct tls_connection *conn = arg;
1485         const u8 *pos = buf;
1486
1487         if (write_p == 2) {
1488                 wpa_printf(MSG_DEBUG,
1489                            "OpenSSL: session ver=0x%x content_type=%d",
1490                            version, content_type);
1491                 wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Data", buf, len);
1492                 return;
1493         }
1494
1495         wpa_printf(MSG_DEBUG, "OpenSSL: %s ver=0x%x content_type=%d (%s/%s)",
1496                    write_p ? "TX" : "RX", version, content_type,
1497                    openssl_content_type(content_type),
1498                    openssl_handshake_type(content_type, buf, len));
1499         wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Message", buf, len);
1500         if (content_type == 24 && len >= 3 && pos[0] == 1) {
1501                 size_t payload_len = WPA_GET_BE16(pos + 1);
1502                 if (payload_len + 3 > len) {
1503                         wpa_printf(MSG_ERROR, "OpenSSL: Heartbeat attack detected");
1504                         conn->invalid_hb_used = 1;
1505                 }
1506         }
1507
1508 #ifdef CONFIG_SUITEB
1509         /*
1510          * Need to parse these handshake messages to be able to check DH prime
1511          * length since OpenSSL does not expose the new cipher suite and DH
1512          * parameters during handshake (e.g., for cert_cb() callback).
1513          */
1514         if (content_type == 22 && pos && len > 0 && pos[0] == 2)
1515                 check_server_hello(conn, pos + 1, pos + len);
1516         if (content_type == 22 && pos && len > 0 && pos[0] == 12)
1517                 check_server_key_exchange(ssl, conn, pos + 1, pos + len);
1518 #endif /* CONFIG_SUITEB */
1519 }
1520
1521
1522 struct tls_connection * tls_connection_init(void *ssl_ctx)
1523 {
1524         struct tls_data *data = ssl_ctx;
1525         SSL_CTX *ssl = data->ssl;
1526         struct tls_connection *conn;
1527         long options;
1528         X509_STORE *new_cert_store;
1529         struct os_reltime now;
1530         struct tls_context *context = SSL_CTX_get_app_data(ssl);
1531
1532         /* Replace X509 store if it is time to update CRL. */
1533         if (data->crl_reload_interval > 0 && os_get_reltime(&now) == 0 &&
1534             os_reltime_expired(&now, &data->crl_last_reload,
1535                                data->crl_reload_interval)) {
1536                 wpa_printf(MSG_INFO,
1537                            "OpenSSL: Flushing X509 store with ca_cert file");
1538                 new_cert_store = tls_crl_cert_reload(data->ca_cert,
1539                                                      data->check_crl);
1540                 if (!new_cert_store) {
1541                         wpa_printf(MSG_ERROR,
1542                                    "OpenSSL: Error replacing X509 store with ca_cert file");
1543                 } else {
1544                         /* Replace old store */
1545                         SSL_CTX_set_cert_store(ssl, new_cert_store);
1546                         data->crl_last_reload = now;
1547                 }
1548         }
1549
1550         conn = os_zalloc(sizeof(*conn));
1551         if (conn == NULL)
1552                 return NULL;
1553         conn->data = data;
1554         conn->ssl_ctx = ssl;
1555         conn->ssl = SSL_new(ssl);
1556         if (conn->ssl == NULL) {
1557                 tls_show_errors(MSG_INFO, __func__,
1558                                 "Failed to initialize new SSL connection");
1559                 os_free(conn);
1560                 return NULL;
1561         }
1562
1563         conn->context = context;
1564         SSL_set_app_data(conn->ssl, conn);
1565         SSL_set_msg_callback(conn->ssl, tls_msg_cb);
1566         SSL_set_msg_callback_arg(conn->ssl, conn);
1567         options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
1568                 SSL_OP_SINGLE_DH_USE;
1569 #ifdef SSL_OP_NO_COMPRESSION
1570         options |= SSL_OP_NO_COMPRESSION;
1571 #endif /* SSL_OP_NO_COMPRESSION */
1572         SSL_set_options(conn->ssl, options);
1573
1574         conn->ssl_in = BIO_new(BIO_s_mem());
1575         if (!conn->ssl_in) {
1576                 tls_show_errors(MSG_INFO, __func__,
1577                                 "Failed to create a new BIO for ssl_in");
1578                 SSL_free(conn->ssl);
1579                 os_free(conn);
1580                 return NULL;
1581         }
1582
1583         conn->ssl_out = BIO_new(BIO_s_mem());
1584         if (!conn->ssl_out) {
1585                 tls_show_errors(MSG_INFO, __func__,
1586                                 "Failed to create a new BIO for ssl_out");
1587                 SSL_free(conn->ssl);
1588                 BIO_free(conn->ssl_in);
1589                 os_free(conn);
1590                 return NULL;
1591         }
1592
1593         SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
1594
1595         return conn;
1596 }
1597
1598
1599 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
1600 {
1601         if (conn == NULL)
1602                 return;
1603         if (conn->success_data) {
1604                 /*
1605                  * Make sure ssl_clear_bad_session() does not remove this
1606                  * session.
1607                  */
1608                 SSL_set_quiet_shutdown(conn->ssl, 1);
1609                 SSL_shutdown(conn->ssl);
1610         }
1611         SSL_free(conn->ssl);
1612         tls_engine_deinit(conn);
1613         os_free(conn->subject_match);
1614         os_free(conn->altsubject_match);
1615         os_free(conn->suffix_match);
1616         os_free(conn->domain_match);
1617         os_free(conn->check_cert_subject);
1618         os_free(conn->session_ticket);
1619         os_free(conn);
1620 }
1621
1622
1623 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
1624 {
1625         return conn ? SSL_is_init_finished(conn->ssl) : 0;
1626 }
1627
1628
1629 char * tls_connection_peer_serial_num(void *tls_ctx,
1630                                       struct tls_connection *conn)
1631 {
1632         ASN1_INTEGER *ser;
1633         char *serial_num;
1634         size_t len;
1635
1636         if (!conn->peer_cert)
1637                 return NULL;
1638
1639         ser = X509_get_serialNumber(conn->peer_cert);
1640         if (!ser)
1641                 return NULL;
1642
1643         len = ASN1_STRING_length(ser) * 2 + 1;
1644         serial_num = os_malloc(len);
1645         if (!serial_num)
1646                 return NULL;
1647         wpa_snprintf_hex_uppercase(serial_num, len,
1648                                    ASN1_STRING_get0_data(ser),
1649                                    ASN1_STRING_length(ser));
1650         return serial_num;
1651 }
1652
1653
1654 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
1655 {
1656         if (conn == NULL)
1657                 return -1;
1658
1659         /* Shutdown previous TLS connection without notifying the peer
1660          * because the connection was already terminated in practice
1661          * and "close notify" shutdown alert would confuse AS. */
1662         SSL_set_quiet_shutdown(conn->ssl, 1);
1663         SSL_shutdown(conn->ssl);
1664         return SSL_clear(conn->ssl) == 1 ? 0 : -1;
1665 }
1666
1667
1668 static int tls_match_altsubject_component(X509 *cert, int type,
1669                                           const char *value, size_t len)
1670 {
1671         GENERAL_NAME *gen;
1672         void *ext;
1673         int found = 0;
1674         stack_index_t i;
1675
1676         ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1677
1678         for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1679                 gen = sk_GENERAL_NAME_value(ext, i);
1680                 if (gen->type != type)
1681                         continue;
1682                 if (os_strlen((char *) gen->d.ia5->data) == len &&
1683                     os_memcmp(value, gen->d.ia5->data, len) == 0)
1684                         found++;
1685         }
1686
1687         sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
1688
1689         return found;
1690 }
1691
1692
1693 static int tls_match_altsubject(X509 *cert, const char *match)
1694 {
1695         int type;
1696         const char *pos, *end;
1697         size_t len;
1698
1699         pos = match;
1700         do {
1701                 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
1702                         type = GEN_EMAIL;
1703                         pos += 6;
1704                 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
1705                         type = GEN_DNS;
1706                         pos += 4;
1707                 } else if (os_strncmp(pos, "URI:", 4) == 0) {
1708                         type = GEN_URI;
1709                         pos += 4;
1710                 } else {
1711                         wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1712                                    "match '%s'", pos);
1713                         return 0;
1714                 }
1715                 end = os_strchr(pos, ';');
1716                 while (end) {
1717                         if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1718                             os_strncmp(end + 1, "DNS:", 4) == 0 ||
1719                             os_strncmp(end + 1, "URI:", 4) == 0)
1720                                 break;
1721                         end = os_strchr(end + 1, ';');
1722                 }
1723                 if (end)
1724                         len = end - pos;
1725                 else
1726                         len = os_strlen(pos);
1727                 if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1728                         return 1;
1729                 pos = end + 1;
1730         } while (end);
1731
1732         return 0;
1733 }
1734
1735
1736 #ifndef CONFIG_NATIVE_WINDOWS
1737 static int domain_suffix_match(const u8 *val, size_t len, const char *match,
1738                                size_t match_len, int full)
1739 {
1740         size_t i;
1741
1742         /* Check for embedded nuls that could mess up suffix matching */
1743         for (i = 0; i < len; i++) {
1744                 if (val[i] == '\0') {
1745                         wpa_printf(MSG_DEBUG, "TLS: Embedded null in a string - reject");
1746                         return 0;
1747                 }
1748         }
1749
1750         if (match_len > len || (full && match_len != len))
1751                 return 0;
1752
1753         if (os_strncasecmp((const char *) val + len - match_len, match,
1754                            match_len) != 0)
1755                 return 0; /* no match */
1756
1757         if (match_len == len)
1758                 return 1; /* exact match */
1759
1760         if (val[len - match_len - 1] == '.')
1761                 return 1; /* full label match completes suffix match */
1762
1763         wpa_printf(MSG_DEBUG, "TLS: Reject due to incomplete label match");
1764         return 0;
1765 }
1766 #endif /* CONFIG_NATIVE_WINDOWS */
1767
1768
1769 struct tls_dn_field_order_cnt {
1770         u8 cn;
1771         u8 c;
1772         u8 l;
1773         u8 st;
1774         u8 o;
1775         u8 ou;
1776         u8 email;
1777 };
1778
1779
1780 static int get_dn_field_index(const struct tls_dn_field_order_cnt *dn_cnt,
1781                               int nid)
1782 {
1783         switch (nid) {
1784         case NID_commonName:
1785                 return dn_cnt->cn;
1786         case NID_countryName:
1787                 return dn_cnt->c;
1788         case NID_localityName:
1789                 return dn_cnt->l;
1790         case NID_stateOrProvinceName:
1791                 return dn_cnt->st;
1792         case NID_organizationName:
1793                 return dn_cnt->o;
1794         case NID_organizationalUnitName:
1795                 return dn_cnt->ou;
1796         case NID_pkcs9_emailAddress:
1797                 return dn_cnt->email;
1798         default:
1799                 wpa_printf(MSG_ERROR,
1800                            "TLS: Unknown NID '%d' in check_cert_subject",
1801                            nid);
1802                 return -1;
1803         }
1804 }
1805
1806
1807 /**
1808  * match_dn_field - Match configuration DN field against Certificate DN field
1809  * @cert: Certificate
1810  * @nid: NID of DN field
1811  * @field: Field name
1812  * @value DN field value which is passed from configuration
1813  *      e.g., if configuration have C=US and this argument will point to US.
1814  * @dn_cnt: DN matching context
1815  * Returns: 1 on success and 0 on failure
1816  */
1817 static int match_dn_field(const X509 *cert, int nid, const char *field,
1818                           const char *value,
1819                           const struct tls_dn_field_order_cnt *dn_cnt)
1820 {
1821         int i, ret = 0, len, config_dn_field_index, match_index = 0;
1822         X509_NAME *name;
1823
1824         len = os_strlen(value);
1825         name = X509_get_subject_name((X509 *) cert);
1826
1827         /* Assign incremented cnt for every field of DN to check DN field in
1828          * right order */
1829         config_dn_field_index = get_dn_field_index(dn_cnt, nid);
1830         if (config_dn_field_index < 0)
1831                 return 0;
1832
1833         /* Fetch value based on NID */
1834         for (i = -1; (i = X509_NAME_get_index_by_NID(name, nid, i)) > -1;) {
1835                 X509_NAME_ENTRY *e;
1836                 ASN1_STRING *cn;
1837
1838                 e = X509_NAME_get_entry(name, i);
1839                 if (!e)
1840                         continue;
1841
1842                 cn = X509_NAME_ENTRY_get_data(e);
1843                 if (!cn)
1844                         continue;
1845
1846                 match_index++;
1847
1848                 /* check for more than one DN field with same name */
1849                 if (match_index != config_dn_field_index)
1850                         continue;
1851
1852                 /* Check wildcard at the right end side */
1853                 /* E.g., if OU=develop* mentioned in configuration, allow 'OU'
1854                  * of the subject in the client certificate to start with
1855                  * 'develop' */
1856                 if (len > 0 && value[len - 1] == '*') {
1857                         /* Compare actual certificate DN field value with
1858                          * configuration DN field value up to the specified
1859                          * length. */
1860                         ret = ASN1_STRING_length(cn) >= len - 1 &&
1861                                 os_memcmp(ASN1_STRING_get0_data(cn), value,
1862                                           len - 1) == 0;
1863                 } else {
1864                         /* Compare actual certificate DN field value with
1865                          * configuration DN field value */
1866                         ret = ASN1_STRING_length(cn) == len &&
1867                                 os_memcmp(ASN1_STRING_get0_data(cn), value,
1868                                           len) == 0;
1869                 }
1870                 if (!ret) {
1871                         wpa_printf(MSG_ERROR,
1872                                    "OpenSSL: Failed to match %s '%s' with certificate DN field value '%s'",
1873                                    field, value, ASN1_STRING_get0_data(cn));
1874                 }
1875                 break;
1876         }
1877
1878         return ret;
1879 }
1880
1881
1882 /**
1883  * get_value_from_field - Get value from DN field
1884  * @cert: Certificate
1885  * @field_str: DN field string which is passed from configuration file (e.g.,
1886  *       C=US)
1887  * @dn_cnt: DN matching context
1888  * Returns: 1 on success and 0 on failure
1889  */
1890 static int get_value_from_field(const X509 *cert, char *field_str,
1891                                 struct tls_dn_field_order_cnt *dn_cnt)
1892 {
1893         int nid;
1894         char *context = NULL, *name, *value;
1895
1896         if (os_strcmp(field_str, "*") == 0)
1897                 return 1; /* wildcard matches everything */
1898
1899         name = str_token(field_str, "=", &context);
1900         if (!name)
1901                 return 0;
1902
1903         /* Compare all configured DN fields and assign nid based on that to
1904          * fetch correct value from certificate subject */
1905         if (os_strcmp(name, "CN") == 0) {
1906                 nid = NID_commonName;
1907                 dn_cnt->cn++;
1908         } else if(os_strcmp(name, "C") == 0) {
1909                 nid = NID_countryName;
1910                 dn_cnt->c++;
1911         } else if (os_strcmp(name, "L") == 0) {
1912                 nid = NID_localityName;
1913                 dn_cnt->l++;
1914         } else if (os_strcmp(name, "ST") == 0) {
1915                 nid = NID_stateOrProvinceName;
1916                 dn_cnt->st++;
1917         } else if (os_strcmp(name, "O") == 0) {
1918                 nid = NID_organizationName;
1919                 dn_cnt->o++;
1920         } else if (os_strcmp(name, "OU") == 0) {
1921                 nid = NID_organizationalUnitName;
1922                 dn_cnt->ou++;
1923         } else if (os_strcmp(name, "emailAddress") == 0) {
1924                 nid = NID_pkcs9_emailAddress;
1925                 dn_cnt->email++;
1926         } else {
1927                 wpa_printf(MSG_ERROR,
1928                         "TLS: Unknown field '%s' in check_cert_subject", name);
1929                 return 0;
1930         }
1931
1932         value = str_token(field_str, "=", &context);
1933         if (!value) {
1934                 wpa_printf(MSG_ERROR,
1935                            "TLS: Distinguished Name field '%s' value is not defined in check_cert_subject",
1936                            name);
1937                 return 0;
1938         }
1939
1940         return match_dn_field(cert, nid, name, value, dn_cnt);
1941 }
1942
1943
1944 /**
1945  * tls_match_dn_field - Match subject DN field with check_cert_subject
1946  * @cert: Certificate
1947  * @match: check_cert_subject string
1948  * Returns: Return 1 on success and 0 on failure
1949 */
1950 static int tls_match_dn_field(X509 *cert, const char *match)
1951 {
1952         const char *token, *last = NULL;
1953         char field[256];
1954         struct tls_dn_field_order_cnt dn_cnt;
1955
1956         os_memset(&dn_cnt, 0, sizeof(dn_cnt));
1957
1958         /* Maximum length of each DN field is 255 characters */
1959
1960         /* Process each '/' delimited field */
1961         while ((token = cstr_token(match, "/", &last))) {
1962                 if (last - token >= (int) sizeof(field)) {
1963                         wpa_printf(MSG_ERROR,
1964                                    "OpenSSL: Too long DN matching field value in '%s'",
1965                                    match);
1966                         return 0;
1967                 }
1968                 os_memcpy(field, token, last - token);
1969                 field[last - token] = '\0';
1970
1971                 if (!get_value_from_field(cert, field, &dn_cnt)) {
1972                         wpa_printf(MSG_DEBUG, "OpenSSL: No match for DN '%s'",
1973                                    field);
1974                         return 0;
1975                 }
1976         }
1977
1978         return 1;
1979 }
1980
1981
1982 #ifndef CONFIG_NATIVE_WINDOWS
1983 static int tls_match_suffix_helper(X509 *cert, const char *match,
1984                                    size_t match_len, int full)
1985 {
1986         GENERAL_NAME *gen;
1987         void *ext;
1988         int i;
1989         stack_index_t j;
1990         int dns_name = 0;
1991         X509_NAME *name;
1992
1993         wpa_printf(MSG_DEBUG, "TLS: Match domain against %s%s",
1994                    full ? "": "suffix ", match);
1995
1996         ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1997
1998         for (j = 0; ext && j < sk_GENERAL_NAME_num(ext); j++) {
1999                 gen = sk_GENERAL_NAME_value(ext, j);
2000                 if (gen->type != GEN_DNS)
2001                         continue;
2002                 dns_name++;
2003                 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate dNSName",
2004                                   gen->d.dNSName->data,
2005                                   gen->d.dNSName->length);
2006                 if (domain_suffix_match(gen->d.dNSName->data,
2007                                         gen->d.dNSName->length,
2008                                         match, match_len, full) == 1) {
2009                         wpa_printf(MSG_DEBUG, "TLS: %s in dNSName found",
2010                                    full ? "Match" : "Suffix match");
2011                         sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
2012                         return 1;
2013                 }
2014         }
2015         sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
2016
2017         if (dns_name) {
2018                 wpa_printf(MSG_DEBUG, "TLS: None of the dNSName(s) matched");
2019                 return 0;
2020         }
2021
2022         name = X509_get_subject_name(cert);
2023         i = -1;
2024         for (;;) {
2025                 X509_NAME_ENTRY *e;
2026                 ASN1_STRING *cn;
2027
2028                 i = X509_NAME_get_index_by_NID(name, NID_commonName, i);
2029                 if (i == -1)
2030                         break;
2031                 e = X509_NAME_get_entry(name, i);
2032                 if (e == NULL)
2033                         continue;
2034                 cn = X509_NAME_ENTRY_get_data(e);
2035                 if (cn == NULL)
2036                         continue;
2037                 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate commonName",
2038                                   cn->data, cn->length);
2039                 if (domain_suffix_match(cn->data, cn->length,
2040                                         match, match_len, full) == 1) {
2041                         wpa_printf(MSG_DEBUG, "TLS: %s in commonName found",
2042                                    full ? "Match" : "Suffix match");
2043                         return 1;
2044                 }
2045         }
2046
2047         wpa_printf(MSG_DEBUG, "TLS: No CommonName %smatch found",
2048                    full ? "": "suffix ");
2049         return 0;
2050 }
2051 #endif /* CONFIG_NATIVE_WINDOWS */
2052
2053
2054 static int tls_match_suffix(X509 *cert, const char *match, int full)
2055 {
2056 #ifdef CONFIG_NATIVE_WINDOWS
2057         /* wincrypt.h has conflicting X509_NAME definition */
2058         return -1;
2059 #else /* CONFIG_NATIVE_WINDOWS */
2060         const char *token, *last = NULL;
2061
2062         /* Process each match alternative separately until a match is found */
2063         while ((token = cstr_token(match, ";", &last))) {
2064                 if (tls_match_suffix_helper(cert, token, last - token, full))
2065                         return 1;
2066         }
2067
2068         return 0;
2069 #endif /* CONFIG_NATIVE_WINDOWS */
2070 }
2071
2072
2073 static enum tls_fail_reason openssl_tls_fail_reason(int err)
2074 {
2075         switch (err) {
2076         case X509_V_ERR_CERT_REVOKED:
2077                 return TLS_FAIL_REVOKED;
2078         case X509_V_ERR_CERT_NOT_YET_VALID:
2079         case X509_V_ERR_CRL_NOT_YET_VALID:
2080                 return TLS_FAIL_NOT_YET_VALID;
2081         case X509_V_ERR_CERT_HAS_EXPIRED:
2082         case X509_V_ERR_CRL_HAS_EXPIRED:
2083                 return TLS_FAIL_EXPIRED;
2084         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
2085         case X509_V_ERR_UNABLE_TO_GET_CRL:
2086         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
2087         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
2088         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
2089         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
2090         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
2091         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
2092         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
2093         case X509_V_ERR_INVALID_CA:
2094                 return TLS_FAIL_UNTRUSTED;
2095         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
2096         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
2097         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
2098         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
2099         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
2100         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
2101         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
2102         case X509_V_ERR_CERT_UNTRUSTED:
2103         case X509_V_ERR_CERT_REJECTED:
2104                 return TLS_FAIL_BAD_CERTIFICATE;
2105         default:
2106                 return TLS_FAIL_UNSPECIFIED;
2107         }
2108 }
2109
2110
2111 static struct wpabuf * get_x509_cert(X509 *cert)
2112 {
2113         struct wpabuf *buf;
2114         u8 *tmp;
2115
2116         int cert_len = i2d_X509(cert, NULL);
2117         if (cert_len <= 0)
2118                 return NULL;
2119
2120         buf = wpabuf_alloc(cert_len);
2121         if (buf == NULL)
2122                 return NULL;
2123
2124         tmp = wpabuf_put(buf, cert_len);
2125         i2d_X509(cert, &tmp);
2126         return buf;
2127 }
2128
2129
2130 static void openssl_tls_fail_event(struct tls_connection *conn,
2131                                    X509 *err_cert, int err, int depth,
2132                                    const char *subject, const char *err_str,
2133                                    enum tls_fail_reason reason)
2134 {
2135         union tls_event_data ev;
2136         struct wpabuf *cert = NULL;
2137         struct tls_context *context = conn->context;
2138
2139         if (context->event_cb == NULL)
2140                 return;
2141
2142         cert = get_x509_cert(err_cert);
2143         os_memset(&ev, 0, sizeof(ev));
2144         ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
2145                 reason : openssl_tls_fail_reason(err);
2146         ev.cert_fail.depth = depth;
2147         ev.cert_fail.subject = subject;
2148         ev.cert_fail.reason_txt = err_str;
2149         ev.cert_fail.cert = cert;
2150         context->event_cb(context->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
2151         wpabuf_free(cert);
2152 }
2153
2154
2155 static void openssl_tls_cert_event(struct tls_connection *conn,
2156                                    X509 *err_cert, int depth,
2157                                    const char *subject)
2158 {
2159         struct wpabuf *cert = NULL;
2160         union tls_event_data ev;
2161         struct tls_context *context = conn->context;
2162         char *altsubject[TLS_MAX_ALT_SUBJECT];
2163         int alt, num_altsubject = 0;
2164         GENERAL_NAME *gen;
2165         void *ext;
2166         stack_index_t i;
2167         ASN1_INTEGER *ser;
2168         char serial_num[128];
2169 #ifdef CONFIG_SHA256
2170         u8 hash[32];
2171 #endif /* CONFIG_SHA256 */
2172
2173         if (context->event_cb == NULL)
2174                 return;
2175
2176         os_memset(&ev, 0, sizeof(ev));
2177         if (conn->cert_probe || (conn->flags & TLS_CONN_EXT_CERT_CHECK) ||
2178             context->cert_in_cb) {
2179                 cert = get_x509_cert(err_cert);
2180                 ev.peer_cert.cert = cert;
2181         }
2182 #ifdef CONFIG_SHA256
2183         if (cert) {
2184                 const u8 *addr[1];
2185                 size_t len[1];
2186                 addr[0] = wpabuf_head(cert);
2187                 len[0] = wpabuf_len(cert);
2188                 if (sha256_vector(1, addr, len, hash) == 0) {
2189                         ev.peer_cert.hash = hash;
2190                         ev.peer_cert.hash_len = sizeof(hash);
2191                 }
2192         }
2193 #endif /* CONFIG_SHA256 */
2194         ev.peer_cert.depth = depth;
2195         ev.peer_cert.subject = subject;
2196
2197         ser = X509_get_serialNumber(err_cert);
2198         if (ser) {
2199                 wpa_snprintf_hex_uppercase(serial_num, sizeof(serial_num),
2200                                            ASN1_STRING_get0_data(ser),
2201                                            ASN1_STRING_length(ser));
2202                 ev.peer_cert.serial_num = serial_num;
2203         }
2204
2205         ext = X509_get_ext_d2i(err_cert, NID_subject_alt_name, NULL, NULL);
2206         for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
2207                 char *pos;
2208
2209                 if (num_altsubject == TLS_MAX_ALT_SUBJECT)
2210                         break;
2211                 gen = sk_GENERAL_NAME_value(ext, i);
2212                 if (gen->type != GEN_EMAIL &&
2213                     gen->type != GEN_DNS &&
2214                     gen->type != GEN_URI)
2215                         continue;
2216
2217                 pos = os_malloc(10 + gen->d.ia5->length + 1);
2218                 if (pos == NULL)
2219                         break;
2220                 altsubject[num_altsubject++] = pos;
2221
2222                 switch (gen->type) {
2223                 case GEN_EMAIL:
2224                         os_memcpy(pos, "EMAIL:", 6);
2225                         pos += 6;
2226                         break;
2227                 case GEN_DNS:
2228                         os_memcpy(pos, "DNS:", 4);
2229                         pos += 4;
2230                         break;
2231                 case GEN_URI:
2232                         os_memcpy(pos, "URI:", 4);
2233                         pos += 4;
2234                         break;
2235                 }
2236
2237                 os_memcpy(pos, gen->d.ia5->data, gen->d.ia5->length);
2238                 pos += gen->d.ia5->length;
2239                 *pos = '\0';
2240         }
2241         sk_GENERAL_NAME_pop_free(ext, GENERAL_NAME_free);
2242
2243         for (alt = 0; alt < num_altsubject; alt++)
2244                 ev.peer_cert.altsubject[alt] = altsubject[alt];
2245         ev.peer_cert.num_altsubject = num_altsubject;
2246
2247         context->event_cb(context->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
2248         wpabuf_free(cert);
2249         for (alt = 0; alt < num_altsubject; alt++)
2250                 os_free(altsubject[alt]);
2251 }
2252
2253
2254 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
2255 {
2256         char buf[256];
2257         X509 *err_cert;
2258         int err, depth;
2259         SSL *ssl;
2260         struct tls_connection *conn;
2261         struct tls_context *context;
2262         char *match, *altmatch, *suffix_match, *domain_match;
2263         const char *check_cert_subject;
2264         const char *err_str;
2265
2266         err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
2267         if (!err_cert)
2268                 return 0;
2269
2270         err = X509_STORE_CTX_get_error(x509_ctx);
2271         depth = X509_STORE_CTX_get_error_depth(x509_ctx);
2272         ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
2273                                          SSL_get_ex_data_X509_STORE_CTX_idx());
2274         X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
2275
2276         conn = SSL_get_app_data(ssl);
2277         if (conn == NULL)
2278                 return 0;
2279
2280         if (depth == 0)
2281                 conn->peer_cert = err_cert;
2282         else if (depth == 1)
2283                 conn->peer_issuer = err_cert;
2284         else if (depth == 2)
2285                 conn->peer_issuer_issuer = err_cert;
2286
2287         context = conn->context;
2288         match = conn->subject_match;
2289         altmatch = conn->altsubject_match;
2290         suffix_match = conn->suffix_match;
2291         domain_match = conn->domain_match;
2292
2293         if (!preverify_ok && !conn->ca_cert_verify)
2294                 preverify_ok = 1;
2295         if (!preverify_ok && depth > 0 && conn->server_cert_only)
2296                 preverify_ok = 1;
2297         if (!preverify_ok && (conn->flags & TLS_CONN_DISABLE_TIME_CHECKS) &&
2298             (err == X509_V_ERR_CERT_HAS_EXPIRED ||
2299              err == X509_V_ERR_CERT_NOT_YET_VALID)) {
2300                 wpa_printf(MSG_DEBUG, "OpenSSL: Ignore certificate validity "
2301                            "time mismatch");
2302                 preverify_ok = 1;
2303         }
2304         if (!preverify_ok && !conn->data->check_crl_strict &&
2305             (err == X509_V_ERR_CRL_HAS_EXPIRED ||
2306              err == X509_V_ERR_CRL_NOT_YET_VALID)) {
2307                 wpa_printf(MSG_DEBUG,
2308                            "OpenSSL: Ignore certificate validity CRL time mismatch");
2309                 preverify_ok = 1;
2310         }
2311
2312         err_str = X509_verify_cert_error_string(err);
2313
2314 #ifdef CONFIG_SHA256
2315         /*
2316          * Do not require preverify_ok so we can explicity allow otherwise
2317          * invalid pinned server certificates.
2318          */
2319         if (depth == 0 && conn->server_cert_only) {
2320                 struct wpabuf *cert;
2321                 cert = get_x509_cert(err_cert);
2322                 if (!cert) {
2323                         wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch "
2324                                    "server certificate data");
2325                         preverify_ok = 0;
2326                 } else {
2327                         u8 hash[32];
2328                         const u8 *addr[1];
2329                         size_t len[1];
2330                         addr[0] = wpabuf_head(cert);
2331                         len[0] = wpabuf_len(cert);
2332                         if (sha256_vector(1, addr, len, hash) < 0 ||
2333                             os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
2334                                 err_str = "Server certificate mismatch";
2335                                 err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
2336                                 preverify_ok = 0;
2337                         } else if (!preverify_ok) {
2338                                 /*
2339                                  * Certificate matches pinned certificate, allow
2340                                  * regardless of other problems.
2341                                  */
2342                                 wpa_printf(MSG_DEBUG,
2343                                            "OpenSSL: Ignore validation issues for a pinned server certificate");
2344                                 preverify_ok = 1;
2345                         }
2346                         wpabuf_free(cert);
2347                 }
2348         }
2349 #endif /* CONFIG_SHA256 */
2350
2351         if (!preverify_ok) {
2352                 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
2353                            " error %d (%s) depth %d for '%s'", err, err_str,
2354                            depth, buf);
2355                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2356                                        err_str, TLS_FAIL_UNSPECIFIED);
2357                 return preverify_ok;
2358         }
2359
2360         wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d "
2361                    "err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
2362                    preverify_ok, err, err_str,
2363                    conn->ca_cert_verify, depth, buf);
2364         check_cert_subject = conn->check_cert_subject;
2365         if (!check_cert_subject)
2366                 check_cert_subject = conn->data->check_cert_subject;
2367         if (check_cert_subject) {
2368                 if (depth == 0 &&
2369                     !tls_match_dn_field(err_cert, check_cert_subject)) {
2370                         preverify_ok = 0;
2371                         openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2372                                                "Distinguished Name",
2373                                                TLS_FAIL_DN_MISMATCH);
2374                 }
2375         }
2376         if (depth == 0 && match && os_strstr(buf, match) == NULL) {
2377                 wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
2378                            "match with '%s'", buf, match);
2379                 preverify_ok = 0;
2380                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2381                                        "Subject mismatch",
2382                                        TLS_FAIL_SUBJECT_MISMATCH);
2383         } else if (depth == 0 && altmatch &&
2384                    !tls_match_altsubject(err_cert, altmatch)) {
2385                 wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
2386                            "'%s' not found", altmatch);
2387                 preverify_ok = 0;
2388                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2389                                        "AltSubject mismatch",
2390                                        TLS_FAIL_ALTSUBJECT_MISMATCH);
2391         } else if (depth == 0 && suffix_match &&
2392                    !tls_match_suffix(err_cert, suffix_match, 0)) {
2393                 wpa_printf(MSG_WARNING, "TLS: Domain suffix match '%s' not found",
2394                            suffix_match);
2395                 preverify_ok = 0;
2396                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2397                                        "Domain suffix mismatch",
2398                                        TLS_FAIL_DOMAIN_SUFFIX_MISMATCH);
2399         } else if (depth == 0 && domain_match &&
2400                    !tls_match_suffix(err_cert, domain_match, 1)) {
2401                 wpa_printf(MSG_WARNING, "TLS: Domain match '%s' not found",
2402                            domain_match);
2403                 preverify_ok = 0;
2404                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2405                                        "Domain mismatch",
2406                                        TLS_FAIL_DOMAIN_MISMATCH);
2407         } else
2408                 openssl_tls_cert_event(conn, err_cert, depth, buf);
2409
2410         if (conn->cert_probe && preverify_ok && depth == 0) {
2411                 wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate "
2412                            "on probe-only run");
2413                 preverify_ok = 0;
2414                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2415                                        "Server certificate chain probe",
2416                                        TLS_FAIL_SERVER_CHAIN_PROBE);
2417         }
2418
2419 #ifdef CONFIG_SUITEB
2420         if (conn->flags & TLS_CONN_SUITEB) {
2421                 EVP_PKEY *pk;
2422                 RSA *rsa;
2423                 int len = -1;
2424
2425                 pk = X509_get_pubkey(err_cert);
2426                 if (pk) {
2427                         rsa = EVP_PKEY_get1_RSA(pk);
2428                         if (rsa) {
2429                                 len = RSA_bits(rsa);
2430                                 RSA_free(rsa);
2431                         }
2432                         EVP_PKEY_free(pk);
2433                 }
2434
2435                 if (len >= 0) {
2436                         wpa_printf(MSG_DEBUG,
2437                                    "OpenSSL: RSA modulus size: %d bits", len);
2438                         if (len < 3072) {
2439                                 preverify_ok = 0;
2440                                 openssl_tls_fail_event(
2441                                         conn, err_cert, err,
2442                                         depth, buf,
2443                                         "Insufficient RSA modulus size",
2444                                         TLS_FAIL_INSUFFICIENT_KEY_LEN);
2445                         }
2446                 }
2447         }
2448 #endif /* CONFIG_SUITEB */
2449
2450 #ifdef OPENSSL_IS_BORINGSSL
2451         if (depth == 0 && (conn->flags & TLS_CONN_REQUEST_OCSP) &&
2452             preverify_ok) {
2453                 enum ocsp_result res;
2454
2455                 res = check_ocsp_resp(conn->ssl_ctx, conn->ssl, err_cert,
2456                                       conn->peer_issuer,
2457                                       conn->peer_issuer_issuer);
2458                 if (res == OCSP_REVOKED) {
2459                         preverify_ok = 0;
2460                         openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2461                                                "certificate revoked",
2462                                                TLS_FAIL_REVOKED);
2463                         if (err == X509_V_OK)
2464                                 X509_STORE_CTX_set_error(
2465                                         x509_ctx, X509_V_ERR_CERT_REVOKED);
2466                 } else if (res != OCSP_GOOD &&
2467                            (conn->flags & TLS_CONN_REQUIRE_OCSP)) {
2468                         preverify_ok = 0;
2469                         openssl_tls_fail_event(conn, err_cert, err, depth, buf,
2470                                                "bad certificate status response",
2471                                                TLS_FAIL_UNSPECIFIED);
2472                 }
2473         }
2474 #endif /* OPENSSL_IS_BORINGSSL */
2475
2476         if (depth == 0 && preverify_ok && context->event_cb != NULL)
2477                 context->event_cb(context->cb_ctx,
2478                                   TLS_CERT_CHAIN_SUCCESS, NULL);
2479
2480         return preverify_ok;
2481 }
2482
2483
2484 #ifndef OPENSSL_NO_STDIO
2485 static int tls_load_ca_der(struct tls_data *data, const char *ca_cert)
2486 {
2487         SSL_CTX *ssl_ctx = data->ssl;
2488         X509_LOOKUP *lookup;
2489         int ret = 0;
2490
2491         lookup = X509_STORE_add_lookup(SSL_CTX_get_cert_store(ssl_ctx),
2492                                        X509_LOOKUP_file());
2493         if (lookup == NULL) {
2494                 tls_show_errors(MSG_WARNING, __func__,
2495                                 "Failed add lookup for X509 store");
2496                 return -1;
2497         }
2498
2499         if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
2500                 unsigned long err = ERR_peek_error();
2501                 tls_show_errors(MSG_WARNING, __func__,
2502                                 "Failed load CA in DER format");
2503                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
2504                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
2505                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
2506                                    "cert already in hash table error",
2507                                    __func__);
2508                 } else
2509                         ret = -1;
2510         }
2511
2512         return ret;
2513 }
2514 #endif /* OPENSSL_NO_STDIO */
2515
2516
2517 static int tls_connection_ca_cert(struct tls_data *data,
2518                                   struct tls_connection *conn,
2519                                   const char *ca_cert, const u8 *ca_cert_blob,
2520                                   size_t ca_cert_blob_len, const char *ca_path)
2521 {
2522         SSL_CTX *ssl_ctx = data->ssl;
2523         X509_STORE *store;
2524
2525         /*
2526          * Remove previously configured trusted CA certificates before adding
2527          * new ones.
2528          */
2529         store = X509_STORE_new();
2530         if (store == NULL) {
2531                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
2532                            "certificate store", __func__);
2533                 return -1;
2534         }
2535         SSL_CTX_set_cert_store(ssl_ctx, store);
2536
2537         SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2538         conn->ca_cert_verify = 1;
2539
2540         if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
2541                 wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate "
2542                            "chain");
2543                 conn->cert_probe = 1;
2544                 conn->ca_cert_verify = 0;
2545                 return 0;
2546         }
2547
2548         if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
2549 #ifdef CONFIG_SHA256
2550                 const char *pos = ca_cert + 7;
2551                 if (os_strncmp(pos, "server/sha256/", 14) != 0) {
2552                         wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert "
2553                                    "hash value '%s'", ca_cert);
2554                         return -1;
2555                 }
2556                 pos += 14;
2557                 if (os_strlen(pos) != 32 * 2) {
2558                         wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 "
2559                                    "hash length in ca_cert '%s'", ca_cert);
2560                         return -1;
2561                 }
2562                 if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
2563                         wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash "
2564                                    "value in ca_cert '%s'", ca_cert);
2565                         return -1;
2566                 }
2567                 conn->server_cert_only = 1;
2568                 wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server "
2569                            "certificate match");
2570                 return 0;
2571 #else /* CONFIG_SHA256 */
2572                 wpa_printf(MSG_INFO, "No SHA256 included in the build - "
2573                            "cannot validate server certificate hash");
2574                 return -1;
2575 #endif /* CONFIG_SHA256 */
2576         }
2577
2578         if (ca_cert_blob) {
2579                 X509 *cert = d2i_X509(NULL,
2580                                       (const unsigned char **) &ca_cert_blob,
2581                                       ca_cert_blob_len);
2582                 if (cert == NULL) {
2583                         tls_show_errors(MSG_WARNING, __func__,
2584                                         "Failed to parse ca_cert_blob");
2585                         return -1;
2586                 }
2587
2588                 if (!X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx),
2589                                          cert)) {
2590                         unsigned long err = ERR_peek_error();
2591                         tls_show_errors(MSG_WARNING, __func__,
2592                                         "Failed to add ca_cert_blob to "
2593                                         "certificate store");
2594                         if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
2595                             ERR_GET_REASON(err) ==
2596                             X509_R_CERT_ALREADY_IN_HASH_TABLE) {
2597                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
2598                                            "cert already in hash table error",
2599                                            __func__);
2600                         } else {
2601                                 X509_free(cert);
2602                                 return -1;
2603                         }
2604                 }
2605                 X509_free(cert);
2606                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
2607                            "to certificate store", __func__);
2608                 return 0;
2609         }
2610
2611 #ifdef ANDROID
2612         /* Single alias */
2613         if (ca_cert && os_strncmp("keystore://", ca_cert, 11) == 0) {
2614                 if (tls_add_ca_from_keystore(SSL_CTX_get_cert_store(ssl_ctx),
2615                                              &ca_cert[11]) < 0)
2616                         return -1;
2617                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2618                 return 0;
2619         }
2620
2621         /* Multiple aliases separated by space */
2622         if (ca_cert && os_strncmp("keystores://", ca_cert, 12) == 0) {
2623                 char *aliases = os_strdup(&ca_cert[12]);
2624                 const char *delim = " ";
2625                 int rc = 0;
2626                 char *savedptr;
2627                 char *alias;
2628
2629                 if (!aliases)
2630                         return -1;
2631                 alias = strtok_r(aliases, delim, &savedptr);
2632                 for (; alias; alias = strtok_r(NULL, delim, &savedptr)) {
2633                         if (tls_add_ca_from_keystore_encoded(
2634                                     SSL_CTX_get_cert_store(ssl_ctx), alias)) {
2635                                 wpa_printf(MSG_WARNING,
2636                                            "OpenSSL: %s - Failed to add ca_cert %s from keystore",
2637                                            __func__, alias);
2638                                 rc = -1;
2639                                 break;
2640                         }
2641                 }
2642                 os_free(aliases);
2643                 if (rc)
2644                         return rc;
2645
2646                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2647                 return 0;
2648         }
2649 #endif /* ANDROID */
2650
2651 #ifdef CONFIG_NATIVE_WINDOWS
2652         if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
2653             0) {
2654                 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
2655                            "system certificate store");
2656                 return 0;
2657         }
2658 #endif /* CONFIG_NATIVE_WINDOWS */
2659
2660         if (ca_cert || ca_path) {
2661 #ifndef OPENSSL_NO_STDIO
2662                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
2663                     1) {
2664                         tls_show_errors(MSG_WARNING, __func__,
2665                                         "Failed to load root certificates");
2666                         if (ca_cert &&
2667                             tls_load_ca_der(data, ca_cert) == 0) {
2668                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
2669                                            "DER format CA certificate",
2670                                            __func__);
2671                         } else
2672                                 return -1;
2673                 } else {
2674                         wpa_printf(MSG_DEBUG, "TLS: Trusted root "
2675                                    "certificate(s) loaded");
2676                         tls_get_errors(data);
2677                 }
2678 #else /* OPENSSL_NO_STDIO */
2679                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
2680                            __func__);
2681                 return -1;
2682 #endif /* OPENSSL_NO_STDIO */
2683         } else {
2684                 /* No ca_cert configured - do not try to verify server
2685                  * certificate */
2686                 conn->ca_cert_verify = 0;
2687         }
2688
2689         return 0;
2690 }
2691
2692
2693 static int tls_global_ca_cert(struct tls_data *data, const char *ca_cert)
2694 {
2695         SSL_CTX *ssl_ctx = data->ssl;
2696
2697         if (ca_cert) {
2698                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
2699                 {
2700                         tls_show_errors(MSG_WARNING, __func__,
2701                                         "Failed to load root certificates");
2702                         return -1;
2703                 }
2704
2705                 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
2706                            "certificate(s) loaded");
2707
2708 #ifndef OPENSSL_NO_STDIO
2709                 /* Add the same CAs to the client certificate requests */
2710                 SSL_CTX_set_client_CA_list(ssl_ctx,
2711                                            SSL_load_client_CA_file(ca_cert));
2712 #endif /* OPENSSL_NO_STDIO */
2713
2714                 os_free(data->ca_cert);
2715                 data->ca_cert = os_strdup(ca_cert);
2716         }
2717
2718         return 0;
2719 }
2720
2721
2722 int tls_global_set_verify(void *ssl_ctx, int check_crl, int strict)
2723 {
2724         int flags;
2725
2726         if (check_crl) {
2727                 struct tls_data *data = ssl_ctx;
2728                 X509_STORE *cs = SSL_CTX_get_cert_store(data->ssl);
2729                 if (cs == NULL) {
2730                         tls_show_errors(MSG_INFO, __func__, "Failed to get "
2731                                         "certificate store when enabling "
2732                                         "check_crl");
2733                         return -1;
2734                 }
2735                 flags = X509_V_FLAG_CRL_CHECK;
2736                 if (check_crl == 2)
2737                         flags |= X509_V_FLAG_CRL_CHECK_ALL;
2738                 X509_STORE_set_flags(cs, flags);
2739
2740                 data->check_crl = check_crl;
2741                 data->check_crl_strict = strict;
2742                 os_get_reltime(&data->crl_last_reload);
2743         }
2744         return 0;
2745 }
2746
2747
2748 static int tls_connection_set_subject_match(struct tls_connection *conn,
2749                                             const char *subject_match,
2750                                             const char *altsubject_match,
2751                                             const char *suffix_match,
2752                                             const char *domain_match,
2753                                             const char *check_cert_subject)
2754 {
2755         os_free(conn->subject_match);
2756         conn->subject_match = NULL;
2757         if (subject_match) {
2758                 conn->subject_match = os_strdup(subject_match);
2759                 if (conn->subject_match == NULL)
2760                         return -1;
2761         }
2762
2763         os_free(conn->altsubject_match);
2764         conn->altsubject_match = NULL;
2765         if (altsubject_match) {
2766                 conn->altsubject_match = os_strdup(altsubject_match);
2767                 if (conn->altsubject_match == NULL)
2768                         return -1;
2769         }
2770
2771         os_free(conn->suffix_match);
2772         conn->suffix_match = NULL;
2773         if (suffix_match) {
2774                 conn->suffix_match = os_strdup(suffix_match);
2775                 if (conn->suffix_match == NULL)
2776                         return -1;
2777         }
2778
2779         os_free(conn->domain_match);
2780         conn->domain_match = NULL;
2781         if (domain_match) {
2782                 conn->domain_match = os_strdup(domain_match);
2783                 if (conn->domain_match == NULL)
2784                         return -1;
2785         }
2786
2787         os_free(conn->check_cert_subject);
2788         conn->check_cert_subject = NULL;
2789         if (check_cert_subject) {
2790                 conn->check_cert_subject = os_strdup(check_cert_subject);
2791                 if (!conn->check_cert_subject)
2792                         return -1;
2793         }
2794
2795         return 0;
2796 }
2797
2798
2799 #ifdef CONFIG_SUITEB
2800 #if OPENSSL_VERSION_NUMBER >= 0x10002000L
2801 static int suiteb_cert_cb(SSL *ssl, void *arg)
2802 {
2803         struct tls_connection *conn = arg;
2804
2805         /*
2806          * This cert_cb() is not really the best location for doing a
2807          * constraint check for the ServerKeyExchange message, but this seems to
2808          * be the only place where the current OpenSSL sequence can be
2809          * terminated cleanly with an TLS alert going out to the server.
2810          */
2811
2812         if (!(conn->flags & TLS_CONN_SUITEB))
2813                 return 1;
2814
2815         /* DHE is enabled only with DHE-RSA-AES256-GCM-SHA384 */
2816         if (conn->cipher_suite != 0x9f)
2817                 return 1;
2818
2819         if (conn->server_dh_prime_len >= 3072)
2820                 return 1;
2821
2822         wpa_printf(MSG_DEBUG,
2823                    "OpenSSL: Server DH prime length (%d bits) not sufficient for Suite B RSA - reject handshake",
2824                    conn->server_dh_prime_len);
2825         return 0;
2826 }
2827 #endif /* OPENSSL_VERSION_NUMBER */
2828 #endif /* CONFIG_SUITEB */
2829
2830
2831 static int tls_set_conn_flags(struct tls_connection *conn, unsigned int flags,
2832                               const char *openssl_ciphers)
2833 {
2834         SSL *ssl = conn->ssl;
2835
2836 #ifdef SSL_OP_NO_TICKET
2837         if (flags & TLS_CONN_DISABLE_SESSION_TICKET)
2838                 SSL_set_options(ssl, SSL_OP_NO_TICKET);
2839         else
2840                 SSL_clear_options(ssl, SSL_OP_NO_TICKET);
2841 #endif /* SSL_OP_NO_TICKET */
2842
2843 #ifdef SSL_OP_NO_TLSv1
2844         if (flags & TLS_CONN_DISABLE_TLSv1_0)
2845                 SSL_set_options(ssl, SSL_OP_NO_TLSv1);
2846         else
2847                 SSL_clear_options(ssl, SSL_OP_NO_TLSv1);
2848 #endif /* SSL_OP_NO_TLSv1 */
2849 #ifdef SSL_OP_NO_TLSv1_1
2850         if (flags & TLS_CONN_DISABLE_TLSv1_1)
2851                 SSL_set_options(ssl, SSL_OP_NO_TLSv1_1);
2852         else
2853                 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_1);
2854 #endif /* SSL_OP_NO_TLSv1_1 */
2855 #ifdef SSL_OP_NO_TLSv1_2
2856         if (flags & TLS_CONN_DISABLE_TLSv1_2)
2857                 SSL_set_options(ssl, SSL_OP_NO_TLSv1_2);
2858         else
2859                 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_2);
2860 #endif /* SSL_OP_NO_TLSv1_2 */
2861 #ifdef SSL_OP_NO_TLSv1_3
2862         if (flags & TLS_CONN_DISABLE_TLSv1_3)
2863                 SSL_set_options(ssl, SSL_OP_NO_TLSv1_3);
2864         else
2865                 SSL_clear_options(ssl, SSL_OP_NO_TLSv1_3);
2866 #endif /* SSL_OP_NO_TLSv1_3 */
2867 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
2868         if (flags & (TLS_CONN_ENABLE_TLSv1_0 |
2869                      TLS_CONN_ENABLE_TLSv1_1 |
2870                      TLS_CONN_ENABLE_TLSv1_2)) {
2871                 int version = 0;
2872
2873                 /* Explicit request to enable TLS versions even if needing to
2874                  * override systemwide policies. */
2875                 if (flags & TLS_CONN_ENABLE_TLSv1_0) {
2876                         version = TLS1_VERSION;
2877                 } else if (flags & TLS_CONN_ENABLE_TLSv1_1) {
2878                         if (!(flags & TLS_CONN_DISABLE_TLSv1_0))
2879                                 version = TLS1_1_VERSION;
2880                 } else if (flags & TLS_CONN_ENABLE_TLSv1_2) {
2881                         if (!(flags & (TLS_CONN_DISABLE_TLSv1_0 |
2882                                        TLS_CONN_DISABLE_TLSv1_1)))
2883                                 version = TLS1_2_VERSION;
2884                 }
2885                 if (!version) {
2886                         wpa_printf(MSG_DEBUG,
2887                                    "OpenSSL: Invalid TLS version configuration");
2888                         return -1;
2889                 }
2890
2891                 if (SSL_set_min_proto_version(ssl, version) != 1) {
2892                         wpa_printf(MSG_DEBUG,
2893                                    "OpenSSL: Failed to set minimum TLS version");
2894                         return -1;
2895                 }
2896         }
2897 #endif /* >= 1.1.0 */
2898
2899 #ifdef CONFIG_SUITEB
2900 #ifdef OPENSSL_IS_BORINGSSL
2901         /* Start with defaults from BoringSSL */
2902         SSL_CTX_set_verify_algorithm_prefs(conn->ssl_ctx, NULL, 0);
2903 #endif /* OPENSSL_IS_BORINGSSL */
2904 #if OPENSSL_VERSION_NUMBER >= 0x10002000L
2905         if (flags & TLS_CONN_SUITEB_NO_ECDH) {
2906                 const char *ciphers = "DHE-RSA-AES256-GCM-SHA384";
2907
2908                 if (openssl_ciphers) {
2909                         wpa_printf(MSG_DEBUG,
2910                                    "OpenSSL: Override ciphers for Suite B (no ECDH): %s",
2911                                    openssl_ciphers);
2912                         ciphers = openssl_ciphers;
2913                 }
2914                 if (SSL_set_cipher_list(ssl, ciphers) != 1) {
2915                         wpa_printf(MSG_INFO,
2916                                    "OpenSSL: Failed to set Suite B ciphers");
2917                         return -1;
2918                 }
2919         } else if (flags & TLS_CONN_SUITEB) {
2920                 EC_KEY *ecdh;
2921                 const char *ciphers =
2922                         "ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384";
2923                 int nid[1] = { NID_secp384r1 };
2924
2925                 if (openssl_ciphers) {
2926                         wpa_printf(MSG_DEBUG,
2927                                    "OpenSSL: Override ciphers for Suite B: %s",
2928                                    openssl_ciphers);
2929                         ciphers = openssl_ciphers;
2930                 }
2931                 if (SSL_set_cipher_list(ssl, ciphers) != 1) {
2932                         wpa_printf(MSG_INFO,
2933                                    "OpenSSL: Failed to set Suite B ciphers");
2934                         return -1;
2935                 }
2936
2937                 if (SSL_set1_curves(ssl, nid, 1) != 1) {
2938                         wpa_printf(MSG_INFO,
2939                                    "OpenSSL: Failed to set Suite B curves");
2940                         return -1;
2941                 }
2942
2943                 ecdh = EC_KEY_new_by_curve_name(NID_secp384r1);
2944                 if (!ecdh || SSL_set_tmp_ecdh(ssl, ecdh) != 1) {
2945                         EC_KEY_free(ecdh);
2946                         wpa_printf(MSG_INFO,
2947                                    "OpenSSL: Failed to set ECDH parameter");
2948                         return -1;
2949                 }
2950                 EC_KEY_free(ecdh);
2951         }
2952         if (flags & (TLS_CONN_SUITEB | TLS_CONN_SUITEB_NO_ECDH)) {
2953 #ifdef OPENSSL_IS_BORINGSSL
2954                 uint16_t sigalgs[1] = { SSL_SIGN_RSA_PKCS1_SHA384 };
2955
2956                 if (SSL_CTX_set_verify_algorithm_prefs(conn->ssl_ctx, sigalgs,
2957                                                        1) != 1) {
2958                         wpa_printf(MSG_INFO,
2959                                    "OpenSSL: Failed to set Suite B sigalgs");
2960                         return -1;
2961                 }
2962 #else /* OPENSSL_IS_BORINGSSL */
2963                 /* ECDSA+SHA384 if need to add EC support here */
2964                 if (SSL_set1_sigalgs_list(ssl, "RSA+SHA384") != 1) {
2965                         wpa_printf(MSG_INFO,
2966                                    "OpenSSL: Failed to set Suite B sigalgs");
2967                         return -1;
2968                 }
2969 #endif /* OPENSSL_IS_BORINGSSL */
2970
2971                 SSL_set_options(ssl, SSL_OP_NO_TLSv1);
2972                 SSL_set_options(ssl, SSL_OP_NO_TLSv1_1);
2973                 SSL_set_cert_cb(ssl, suiteb_cert_cb, conn);
2974         }
2975 #else /* OPENSSL_VERSION_NUMBER < 0x10002000L */
2976         if (flags & (TLS_CONN_SUITEB | TLS_CONN_SUITEB_NO_ECDH)) {
2977                 wpa_printf(MSG_ERROR,
2978                            "OpenSSL: Suite B RSA case not supported with this OpenSSL version");
2979                 return -1;
2980         }
2981 #endif /* OPENSSL_VERSION_NUMBER */
2982
2983 #ifdef OPENSSL_IS_BORINGSSL
2984         if (openssl_ciphers && os_strcmp(openssl_ciphers, "SUITEB192") == 0) {
2985                 uint16_t sigalgs[1] = { SSL_SIGN_ECDSA_SECP384R1_SHA384 };
2986                 int nid[1] = { NID_secp384r1 };
2987
2988                 if (SSL_set1_curves(ssl, nid, 1) != 1) {
2989                         wpa_printf(MSG_INFO,
2990                                    "OpenSSL: Failed to set Suite B curves");
2991                         return -1;
2992                 }
2993
2994                 if (SSL_CTX_set_verify_algorithm_prefs(conn->ssl_ctx, sigalgs,
2995                                                        1) != 1) {
2996                         wpa_printf(MSG_INFO,
2997                                    "OpenSSL: Failed to set Suite B sigalgs");
2998                         return -1;
2999                 }
3000         }
3001 #else /* OPENSSL_IS_BORINGSSL */
3002         if (!(flags & (TLS_CONN_SUITEB | TLS_CONN_SUITEB_NO_ECDH)) &&
3003             openssl_ciphers && SSL_set_cipher_list(ssl, openssl_ciphers) != 1) {
3004                 wpa_printf(MSG_INFO,
3005                            "OpenSSL: Failed to set openssl_ciphers '%s'",
3006                            openssl_ciphers);
3007                 return -1;
3008         }
3009 #endif /* OPENSSL_IS_BORINGSSL */
3010 #else /* CONFIG_SUITEB */
3011         if (openssl_ciphers && SSL_set_cipher_list(ssl, openssl_ciphers) != 1) {
3012                 wpa_printf(MSG_INFO,
3013                            "OpenSSL: Failed to set openssl_ciphers '%s'",
3014                            openssl_ciphers);
3015                 return -1;
3016         }
3017 #endif /* CONFIG_SUITEB */
3018
3019         return 0;
3020 }
3021
3022
3023 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
3024                               int verify_peer, unsigned int flags,
3025                               const u8 *session_ctx, size_t session_ctx_len)
3026 {
3027         static int counter = 0;
3028         struct tls_data *data = ssl_ctx;
3029
3030         if (conn == NULL)
3031                 return -1;
3032
3033         if (verify_peer) {
3034                 conn->ca_cert_verify = 1;
3035                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
3036                                SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
3037                                SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
3038         } else {
3039                 conn->ca_cert_verify = 0;
3040                 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
3041         }
3042
3043         if (tls_set_conn_flags(conn, flags, NULL) < 0)
3044                 return -1;
3045         conn->flags = flags;
3046
3047         SSL_set_accept_state(conn->ssl);
3048
3049         if (data->tls_session_lifetime == 0) {
3050                 /*
3051                  * Set session id context to a unique value to make sure
3052                  * session resumption cannot be used either through session
3053                  * caching or TLS ticket extension.
3054                  */
3055                 counter++;
3056                 SSL_set_session_id_context(conn->ssl,
3057                                            (const unsigned char *) &counter,
3058                                            sizeof(counter));
3059         } else if (session_ctx) {
3060                 SSL_set_session_id_context(conn->ssl, session_ctx,
3061                                            session_ctx_len);
3062         }
3063
3064         return 0;
3065 }
3066
3067
3068 static int tls_connection_client_cert(struct tls_connection *conn,
3069                                       const char *client_cert,
3070                                       const u8 *client_cert_blob,
3071                                       size_t client_cert_blob_len)
3072 {
3073         if (client_cert == NULL && client_cert_blob == NULL)
3074                 return 0;
3075
3076 #ifdef PKCS12_FUNCS
3077 #if OPENSSL_VERSION_NUMBER < 0x10002000L || defined(LIBRESSL_VERSION_NUMBER)
3078         /*
3079          * Clear previously set extra chain certificates, if any, from PKCS#12
3080          * processing in tls_parse_pkcs12() to allow OpenSSL to build a new
3081          * chain properly.
3082          */
3083         SSL_CTX_clear_extra_chain_certs(conn->ssl_ctx);
3084 #endif /* OPENSSL_VERSION_NUMBER < 0x10002000L */
3085 #endif /* PKCS12_FUNCS */
3086
3087         if (client_cert_blob &&
3088             SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
3089                                      client_cert_blob_len) == 1) {
3090                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
3091                            "OK");
3092                 return 0;
3093         } else if (client_cert_blob) {
3094                 tls_show_errors(MSG_DEBUG, __func__,
3095                                 "SSL_use_certificate_ASN1 failed");
3096         }
3097
3098         if (client_cert == NULL)
3099                 return -1;
3100
3101 #ifdef ANDROID
3102         if (os_strncmp("keystore://", client_cert, 11) == 0) {
3103                 BIO *bio = BIO_from_keystore(&client_cert[11]);
3104                 X509 *x509 = NULL;
3105                 int ret = -1;
3106                 if (bio) {
3107                         x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
3108                 }
3109                 if (x509) {
3110                         if (SSL_use_certificate(conn->ssl, x509) == 1)
3111                                 ret = 0;
3112                         X509_free(x509);
3113                 }
3114
3115                 /* Read additional certificates into the chain. */
3116                 while (bio) {
3117                         x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
3118                         if (x509) {
3119                                 /* Takes ownership of x509 */
3120                                 SSL_add0_chain_cert(conn->ssl, x509);
3121                         } else {
3122                                 BIO_free(bio);
3123                                 bio = NULL;
3124                         }
3125                 }
3126                 return ret;
3127         }
3128 #endif /* ANDROID */
3129
3130 #ifndef OPENSSL_NO_STDIO
3131         if (SSL_use_certificate_file(conn->ssl, client_cert,
3132                                      SSL_FILETYPE_ASN1) == 1) {
3133                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
3134                            " --> OK");
3135                 return 0;
3136         }
3137
3138 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
3139         !defined(LIBRESSL_VERSION_NUMBER) && !defined(OPENSSL_IS_BORINGSSL)
3140         if (SSL_use_certificate_chain_file(conn->ssl, client_cert) == 1) {
3141                 ERR_clear_error();
3142                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_chain_file"
3143                            " --> OK");
3144                 return 0;
3145         }
3146 #else
3147         if (SSL_use_certificate_file(conn->ssl, client_cert,
3148                                      SSL_FILETYPE_PEM) == 1) {
3149                 ERR_clear_error();
3150                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
3151                            " --> OK");
3152                 return 0;
3153         }
3154 #endif
3155
3156         tls_show_errors(MSG_DEBUG, __func__,
3157                         "SSL_use_certificate_file failed");
3158 #else /* OPENSSL_NO_STDIO */
3159         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
3160 #endif /* OPENSSL_NO_STDIO */
3161
3162         return -1;
3163 }
3164
3165
3166 static int tls_global_client_cert(struct tls_data *data,
3167                                   const char *client_cert)
3168 {
3169 #ifndef OPENSSL_NO_STDIO
3170         SSL_CTX *ssl_ctx = data->ssl;
3171
3172         if (client_cert == NULL)
3173                 return 0;
3174
3175         if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
3176                                          SSL_FILETYPE_ASN1) != 1 &&
3177             SSL_CTX_use_certificate_chain_file(ssl_ctx, client_cert) != 1 &&
3178             SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
3179                                          SSL_FILETYPE_PEM) != 1) {
3180                 tls_show_errors(MSG_INFO, __func__,
3181                                 "Failed to load client certificate");
3182                 return -1;
3183         }
3184         return 0;
3185 #else /* OPENSSL_NO_STDIO */
3186         if (client_cert == NULL)
3187                 return 0;
3188         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
3189         return -1;
3190 #endif /* OPENSSL_NO_STDIO */
3191 }
3192
3193
3194 #ifdef PKCS12_FUNCS
3195 static int tls_parse_pkcs12(struct tls_data *data, SSL *ssl, PKCS12 *p12,
3196                             const char *passwd)
3197 {
3198         EVP_PKEY *pkey;
3199         X509 *cert;
3200         STACK_OF(X509) *certs;
3201         int res = 0;
3202         char buf[256];
3203
3204         pkey = NULL;
3205         cert = NULL;
3206         certs = NULL;
3207         if (!passwd)
3208                 passwd = "";
3209         if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
3210                 tls_show_errors(MSG_DEBUG, __func__,
3211                                 "Failed to parse PKCS12 file");
3212                 PKCS12_free(p12);
3213                 return -1;
3214         }
3215         wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
3216
3217         if (cert) {
3218                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
3219                                   sizeof(buf));
3220                 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
3221                            "subject='%s'", buf);
3222                 if (ssl) {
3223                         if (SSL_use_certificate(ssl, cert) != 1)
3224                                 res = -1;
3225                 } else {
3226                         if (SSL_CTX_use_certificate(data->ssl, cert) != 1)
3227                                 res = -1;
3228                 }
3229                 X509_free(cert);
3230         }
3231
3232         if (pkey) {
3233                 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
3234                 if (ssl) {
3235                         if (SSL_use_PrivateKey(ssl, pkey) != 1)
3236                                 res = -1;
3237                 } else {
3238                         if (SSL_CTX_use_PrivateKey(data->ssl, pkey) != 1)
3239                                 res = -1;
3240                 }
3241                 EVP_PKEY_free(pkey);
3242         }
3243
3244         if (certs) {
3245 #if OPENSSL_VERSION_NUMBER >= 0x10002000L && !defined(LIBRESSL_VERSION_NUMBER)
3246                 if (ssl)
3247                         SSL_clear_chain_certs(ssl);
3248                 else
3249                         SSL_CTX_clear_chain_certs(data->ssl);
3250                 while ((cert = sk_X509_pop(certs)) != NULL) {
3251                         X509_NAME_oneline(X509_get_subject_name(cert), buf,
3252                                           sizeof(buf));
3253                         wpa_printf(MSG_DEBUG, "TLS: additional certificate"
3254                                    " from PKCS12: subject='%s'", buf);
3255                         if ((ssl && SSL_add1_chain_cert(ssl, cert) != 1) ||
3256                             (!ssl && SSL_CTX_add1_chain_cert(data->ssl,
3257                                                              cert) != 1)) {
3258                                 tls_show_errors(MSG_DEBUG, __func__,
3259                                                 "Failed to add additional certificate");
3260                                 res = -1;
3261                                 X509_free(cert);
3262                                 break;
3263                         }
3264                         X509_free(cert);
3265                 }
3266                 if (!res) {
3267                         /* Try to continue anyway */
3268                 }
3269                 sk_X509_pop_free(certs, X509_free);
3270 #ifndef OPENSSL_IS_BORINGSSL
3271                 if (ssl)
3272                         res = SSL_build_cert_chain(
3273                                 ssl,
3274                                 SSL_BUILD_CHAIN_FLAG_CHECK |
3275                                 SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR);
3276                 else
3277                         res = SSL_CTX_build_cert_chain(
3278                                 data->ssl,
3279                                 SSL_BUILD_CHAIN_FLAG_CHECK |
3280                                 SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR);
3281                 if (!res) {
3282                         tls_show_errors(MSG_DEBUG, __func__,
3283                                         "Failed to build certificate chain");
3284                 } else if (res == 2) {
3285                         wpa_printf(MSG_DEBUG,
3286                                    "TLS: Ignore certificate chain verification error when building chain with PKCS#12 extra certificates");
3287                 }
3288 #endif /* OPENSSL_IS_BORINGSSL */
3289                 /*
3290                  * Try to continue regardless of result since it is possible for
3291                  * the extra certificates not to be required.
3292                  */
3293                 res = 0;
3294 #else /* OPENSSL_VERSION_NUMBER >= 0x10002000L */
3295                 SSL_CTX_clear_extra_chain_certs(data->ssl);
3296                 while ((cert = sk_X509_pop(certs)) != NULL) {
3297                         X509_NAME_oneline(X509_get_subject_name(cert), buf,
3298                                           sizeof(buf));
3299                         wpa_printf(MSG_DEBUG, "TLS: additional certificate"
3300                                    " from PKCS12: subject='%s'", buf);
3301                         /*
3302                          * There is no SSL equivalent for the chain cert - so
3303                          * always add it to the context...
3304                          */
3305                         if (SSL_CTX_add_extra_chain_cert(data->ssl, cert) != 1)
3306                         {
3307                                 X509_free(cert);
3308                                 res = -1;
3309                                 break;
3310                         }
3311                 }
3312                 sk_X509_pop_free(certs, X509_free);
3313 #endif /* OPENSSL_VERSION_NUMBER >= 0x10002000L */
3314         }
3315
3316         PKCS12_free(p12);
3317
3318         if (res < 0)
3319                 tls_get_errors(data);
3320
3321         return res;
3322 }
3323 #endif  /* PKCS12_FUNCS */
3324
3325
3326 static int tls_read_pkcs12(struct tls_data *data, SSL *ssl,
3327                            const char *private_key, const char *passwd)
3328 {
3329 #ifdef PKCS12_FUNCS
3330         FILE *f;
3331         PKCS12 *p12;
3332
3333         f = fopen(private_key, "rb");
3334         if (f == NULL)
3335                 return -1;
3336
3337         p12 = d2i_PKCS12_fp(f, NULL);
3338         fclose(f);
3339
3340         if (p12 == NULL) {
3341                 tls_show_errors(MSG_INFO, __func__,
3342                                 "Failed to use PKCS#12 file");
3343                 return -1;
3344         }
3345
3346         return tls_parse_pkcs12(data, ssl, p12, passwd);
3347
3348 #else /* PKCS12_FUNCS */
3349         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
3350                    "p12/pfx files");
3351         return -1;
3352 #endif  /* PKCS12_FUNCS */
3353 }
3354
3355
3356 static int tls_read_pkcs12_blob(struct tls_data *data, SSL *ssl,
3357                                 const u8 *blob, size_t len, const char *passwd)
3358 {
3359 #ifdef PKCS12_FUNCS
3360         PKCS12 *p12;
3361
3362         p12 = d2i_PKCS12(NULL, (const unsigned char **) &blob, len);
3363         if (p12 == NULL) {
3364                 tls_show_errors(MSG_INFO, __func__,
3365                                 "Failed to use PKCS#12 blob");
3366                 return -1;
3367         }
3368
3369         return tls_parse_pkcs12(data, ssl, p12, passwd);
3370
3371 #else /* PKCS12_FUNCS */
3372         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
3373                    "p12/pfx blobs");
3374         return -1;
3375 #endif  /* PKCS12_FUNCS */
3376 }
3377
3378
3379 #ifndef OPENSSL_NO_ENGINE
3380 static int tls_engine_get_cert(struct tls_connection *conn,
3381                                const char *cert_id,
3382                                X509 **cert)
3383 {
3384         /* this runs after the private key is loaded so no PIN is required */
3385         struct {
3386                 const char *cert_id;
3387                 X509 *cert;
3388         } params;
3389         params.cert_id = cert_id;
3390         params.cert = NULL;
3391
3392         if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
3393                              0, &params, NULL, 1)) {
3394                 unsigned long err = ERR_get_error();
3395
3396                 wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
3397                            " '%s' [%s]", cert_id,
3398                            ERR_error_string(err, NULL));
3399                 if (tls_is_pin_error(err))
3400                         return TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN;
3401                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
3402         }
3403         if (!params.cert) {
3404                 wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
3405                            " '%s'", cert_id);
3406                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
3407         }
3408         *cert = params.cert;
3409         return 0;
3410 }
3411 #endif /* OPENSSL_NO_ENGINE */
3412
3413
3414 static int tls_connection_engine_client_cert(struct tls_connection *conn,
3415                                              const char *cert_id)
3416 {
3417 #ifndef OPENSSL_NO_ENGINE
3418         X509 *cert;
3419
3420         if (tls_engine_get_cert(conn, cert_id, &cert))
3421                 return -1;
3422
3423         if (!SSL_use_certificate(conn->ssl, cert)) {
3424                 tls_show_errors(MSG_ERROR, __func__,
3425                                 "SSL_use_certificate failed");
3426                 X509_free(cert);
3427                 return -1;
3428         }
3429         X509_free(cert);
3430         wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
3431                    "OK");
3432         return 0;
3433
3434 #else /* OPENSSL_NO_ENGINE */
3435         return -1;
3436 #endif /* OPENSSL_NO_ENGINE */
3437 }
3438
3439
3440 static int tls_connection_engine_ca_cert(struct tls_data *data,
3441                                          struct tls_connection *conn,
3442                                          const char *ca_cert_id)
3443 {
3444 #ifndef OPENSSL_NO_ENGINE
3445         X509 *cert;
3446         SSL_CTX *ssl_ctx = data->ssl;
3447         X509_STORE *store;
3448
3449         if (tls_engine_get_cert(conn, ca_cert_id, &cert))
3450                 return -1;
3451
3452         /* start off the same as tls_connection_ca_cert */
3453         store = X509_STORE_new();
3454         if (store == NULL) {
3455                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
3456                            "certificate store", __func__);
3457                 X509_free(cert);
3458                 return -1;
3459         }
3460         SSL_CTX_set_cert_store(ssl_ctx, store);
3461         if (!X509_STORE_add_cert(store, cert)) {
3462                 unsigned long err = ERR_peek_error();
3463                 tls_show_errors(MSG_WARNING, __func__,
3464                                 "Failed to add CA certificate from engine "
3465                                 "to certificate store");
3466                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
3467                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
3468                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
3469                                    " already in hash table error",
3470                                    __func__);
3471                 } else {
3472                         X509_free(cert);
3473                         return -1;
3474                 }
3475         }
3476         X509_free(cert);
3477         wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
3478                    "to certificate store", __func__);
3479         SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
3480         conn->ca_cert_verify = 1;
3481
3482         return 0;
3483
3484 #else /* OPENSSL_NO_ENGINE */
3485         return -1;
3486 #endif /* OPENSSL_NO_ENGINE */
3487 }
3488
3489
3490 static int tls_connection_engine_private_key(struct tls_connection *conn)
3491 {
3492 #if defined(ANDROID) || !defined(OPENSSL_NO_ENGINE)
3493         if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
3494                 tls_show_errors(MSG_ERROR, __func__,
3495                                 "ENGINE: cannot use private key for TLS");
3496                 return -1;
3497         }
3498         if (!SSL_check_private_key(conn->ssl)) {
3499                 tls_show_errors(MSG_INFO, __func__,
3500                                 "Private key failed verification");
3501                 return -1;
3502         }
3503         return 0;
3504 #else /* OPENSSL_NO_ENGINE */
3505         wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
3506                    "engine support was not compiled in");
3507         return -1;
3508 #endif /* OPENSSL_NO_ENGINE */
3509 }
3510
3511
3512 #ifndef OPENSSL_NO_STDIO
3513 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
3514 {
3515         if (!password)
3516                 return 0;
3517         os_strlcpy(buf, (const char *) password, size);
3518         return os_strlen(buf);
3519 }
3520 #endif /* OPENSSL_NO_STDIO */
3521
3522
3523 static int tls_use_private_key_file(struct tls_data *data, SSL *ssl,
3524                                     const char *private_key,
3525                                     const char *private_key_passwd)
3526 {
3527 #ifndef OPENSSL_NO_STDIO
3528         BIO *bio;
3529         EVP_PKEY *pkey;
3530         int ret;
3531
3532         /* First try ASN.1 (DER). */
3533         bio = BIO_new_file(private_key, "r");
3534         if (!bio)
3535                 return -1;
3536         pkey = d2i_PrivateKey_bio(bio, NULL);
3537         BIO_free(bio);
3538
3539         if (pkey) {
3540                 wpa_printf(MSG_DEBUG, "OpenSSL: %s (DER) --> loaded", __func__);
3541         } else {
3542                 /* Try PEM with the provided password. */
3543                 bio = BIO_new_file(private_key, "r");
3544                 if (!bio)
3545                         return -1;
3546                 pkey = PEM_read_bio_PrivateKey(bio, NULL, tls_passwd_cb,
3547                                                (void *) private_key_passwd);
3548                 BIO_free(bio);
3549                 if (!pkey)
3550                         return -1;
3551                 wpa_printf(MSG_DEBUG, "OpenSSL: %s (PEM) --> loaded", __func__);
3552                 /* Clear errors from the previous failed load. */
3553                 ERR_clear_error();
3554         }
3555
3556         if (ssl)
3557                 ret = SSL_use_PrivateKey(ssl, pkey);
3558         else
3559                 ret = SSL_CTX_use_PrivateKey(data->ssl, pkey);
3560
3561         EVP_PKEY_free(pkey);
3562         return ret == 1 ? 0 : -1;
3563 #else /* OPENSSL_NO_STDIO */
3564         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
3565         return -1;
3566 #endif /* OPENSSL_NO_STDIO */
3567 }
3568
3569
3570 static int tls_connection_private_key(struct tls_data *data,
3571                                       struct tls_connection *conn,
3572                                       const char *private_key,
3573                                       const char *private_key_passwd,
3574                                       const u8 *private_key_blob,
3575                                       size_t private_key_blob_len)
3576 {
3577         int ok;
3578
3579         if (private_key == NULL && private_key_blob == NULL)
3580                 return 0;
3581
3582         ok = 0;
3583         while (private_key_blob) {
3584                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
3585                                             (u8 *) private_key_blob,
3586                                             private_key_blob_len) == 1) {
3587                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
3588                                    "ASN1(EVP_PKEY_RSA) --> OK");
3589                         ok = 1;
3590                         break;
3591                 }
3592
3593                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
3594                                             (u8 *) private_key_blob,
3595                                             private_key_blob_len) == 1) {
3596                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
3597                                    "ASN1(EVP_PKEY_DSA) --> OK");
3598                         ok = 1;
3599                         break;
3600                 }
3601
3602                 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
3603                                                (u8 *) private_key_blob,
3604                                                private_key_blob_len) == 1) {
3605                         wpa_printf(MSG_DEBUG, "OpenSSL: "
3606                                    "SSL_use_RSAPrivateKey_ASN1 --> OK");
3607                         ok = 1;
3608                         break;
3609                 }
3610
3611                 if (tls_read_pkcs12_blob(data, conn->ssl, private_key_blob,
3612                                          private_key_blob_len,
3613                                          private_key_passwd) == 0) {
3614                         wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
3615                                    "OK");
3616                         ok = 1;
3617                         break;
3618                 }
3619
3620                 break;
3621         }
3622
3623         while (!ok && private_key) {
3624                 if (tls_use_private_key_file(data, conn->ssl, private_key,
3625                                              private_key_passwd) == 0) {
3626                         ok = 1;
3627                         break;
3628                 }
3629
3630                 if (tls_read_pkcs12(data, conn->ssl, private_key,
3631                                     private_key_passwd) == 0) {
3632                         wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
3633                                    "--> OK");
3634                         ok = 1;
3635                         break;
3636                 }
3637
3638                 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
3639                         wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
3640                                    "access certificate store --> OK");
3641                         ok = 1;
3642                         break;
3643                 }
3644
3645                 break;
3646         }
3647
3648         if (!ok) {
3649                 tls_show_errors(MSG_INFO, __func__,
3650                                 "Failed to load private key");
3651                 return -1;
3652         }
3653         ERR_clear_error();
3654
3655         if (!SSL_check_private_key(conn->ssl)) {
3656                 tls_show_errors(MSG_INFO, __func__, "Private key failed "
3657                                 "verification");
3658                 return -1;
3659         }
3660
3661         wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
3662         return 0;
3663 }
3664
3665
3666 static int tls_global_private_key(struct tls_data *data,
3667                                   const char *private_key,
3668                                   const char *private_key_passwd)
3669 {
3670         SSL_CTX *ssl_ctx = data->ssl;
3671
3672         if (private_key == NULL)
3673                 return 0;
3674
3675         if (tls_use_private_key_file(data, NULL, private_key,
3676                                      private_key_passwd) &&
3677             tls_read_pkcs12(data, NULL, private_key, private_key_passwd)) {
3678                 tls_show_errors(MSG_INFO, __func__,
3679                                 "Failed to load private key");
3680                 ERR_clear_error();
3681                 return -1;
3682         }
3683         ERR_clear_error();
3684
3685         if (!SSL_CTX_check_private_key(ssl_ctx)) {
3686                 tls_show_errors(MSG_INFO, __func__,
3687                                 "Private key failed verification");
3688                 return -1;
3689         }
3690
3691         return 0;
3692 }
3693
3694
3695 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
3696 {
3697 #ifdef OPENSSL_NO_DH
3698         if (dh_file == NULL)
3699                 return 0;
3700         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
3701                    "dh_file specified");
3702         return -1;
3703 #else /* OPENSSL_NO_DH */
3704         DH *dh;
3705         BIO *bio;
3706
3707         /* TODO: add support for dh_blob */
3708         if (dh_file == NULL)
3709                 return 0;
3710         if (conn == NULL)
3711                 return -1;
3712
3713         bio = BIO_new_file(dh_file, "r");
3714         if (bio == NULL) {
3715                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
3716                            dh_file, ERR_error_string(ERR_get_error(), NULL));
3717                 return -1;
3718         }
3719         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
3720         BIO_free(bio);
3721 #ifndef OPENSSL_NO_DSA
3722         while (dh == NULL) {
3723                 DSA *dsa;
3724                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
3725                            " trying to parse as DSA params", dh_file,
3726                            ERR_error_string(ERR_get_error(), NULL));
3727                 bio = BIO_new_file(dh_file, "r");
3728                 if (bio == NULL)
3729                         break;
3730                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
3731                 BIO_free(bio);
3732                 if (!dsa) {
3733                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
3734                                    "'%s': %s", dh_file,
3735                                    ERR_error_string(ERR_get_error(), NULL));
3736                         break;
3737                 }
3738
3739                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
3740                 dh = DSA_dup_DH(dsa);
3741                 DSA_free(dsa);
3742                 if (dh == NULL) {
3743                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
3744                                    "params into DH params");
3745                         break;
3746                 }
3747                 break;
3748         }
3749 #endif /* !OPENSSL_NO_DSA */
3750         if (dh == NULL) {
3751                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
3752                            "'%s'", dh_file);
3753                 return -1;
3754         }
3755
3756         if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
3757                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
3758                            "%s", dh_file,
3759                            ERR_error_string(ERR_get_error(), NULL));
3760                 DH_free(dh);
3761                 return -1;
3762         }
3763         DH_free(dh);
3764         return 0;
3765 #endif /* OPENSSL_NO_DH */
3766 }
3767
3768
3769 static int tls_global_dh(struct tls_data *data, const char *dh_file)
3770 {
3771 #ifdef OPENSSL_NO_DH
3772         if (dh_file == NULL)
3773                 return 0;
3774         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
3775                    "dh_file specified");
3776         return -1;
3777 #else /* OPENSSL_NO_DH */
3778         SSL_CTX *ssl_ctx = data->ssl;
3779         DH *dh;
3780         BIO *bio;
3781
3782         /* TODO: add support for dh_blob */
3783         if (dh_file == NULL)
3784                 return 0;
3785         if (ssl_ctx == NULL)
3786                 return -1;
3787
3788         bio = BIO_new_file(dh_file, "r");
3789         if (bio == NULL) {
3790                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
3791                            dh_file, ERR_error_string(ERR_get_error(), NULL));
3792                 return -1;
3793         }
3794         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
3795         BIO_free(bio);
3796 #ifndef OPENSSL_NO_DSA
3797         while (dh == NULL) {
3798                 DSA *dsa;
3799                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
3800                            " trying to parse as DSA params", dh_file,
3801                            ERR_error_string(ERR_get_error(), NULL));
3802                 bio = BIO_new_file(dh_file, "r");
3803                 if (bio == NULL)
3804                         break;
3805                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
3806                 BIO_free(bio);
3807                 if (!dsa) {
3808                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
3809                                    "'%s': %s", dh_file,
3810                                    ERR_error_string(ERR_get_error(), NULL));
3811                         break;
3812                 }
3813
3814                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
3815                 dh = DSA_dup_DH(dsa);
3816                 DSA_free(dsa);
3817                 if (dh == NULL) {
3818                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
3819                                    "params into DH params");
3820                         break;
3821                 }
3822                 break;
3823         }
3824 #endif /* !OPENSSL_NO_DSA */
3825         if (dh == NULL) {
3826                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
3827                            "'%s'", dh_file);
3828                 return -1;
3829         }
3830
3831         if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
3832                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
3833                            "%s", dh_file,
3834                            ERR_error_string(ERR_get_error(), NULL));
3835                 DH_free(dh);
3836                 return -1;
3837         }
3838         DH_free(dh);
3839         return 0;
3840 #endif /* OPENSSL_NO_DH */
3841 }
3842
3843
3844 int tls_connection_get_random(void *ssl_ctx, struct tls_connection *conn,
3845                               struct tls_random *keys)
3846 {
3847         SSL *ssl;
3848
3849         if (conn == NULL || keys == NULL)
3850                 return -1;
3851         ssl = conn->ssl;
3852         if (ssl == NULL)
3853                 return -1;
3854
3855         os_memset(keys, 0, sizeof(*keys));
3856         keys->client_random = conn->client_random;
3857         keys->client_random_len = SSL_get_client_random(
3858                 ssl, conn->client_random, sizeof(conn->client_random));
3859         keys->server_random = conn->server_random;
3860         keys->server_random_len = SSL_get_server_random(
3861                 ssl, conn->server_random, sizeof(conn->server_random));
3862
3863         return 0;
3864 }
3865
3866
3867 #ifdef OPENSSL_NEED_EAP_FAST_PRF
3868 static int openssl_get_keyblock_size(SSL *ssl)
3869 {
3870 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
3871         (defined(LIBRESSL_VERSION_NUMBER) && \
3872          LIBRESSL_VERSION_NUMBER < 0x20700000L)
3873         const EVP_CIPHER *c;
3874         const EVP_MD *h;
3875         int md_size;
3876
3877         if (ssl->enc_read_ctx == NULL || ssl->enc_read_ctx->cipher == NULL ||
3878             ssl->read_hash == NULL)
3879                 return -1;
3880
3881         c = ssl->enc_read_ctx->cipher;
3882         h = EVP_MD_CTX_md(ssl->read_hash);
3883         if (h)
3884                 md_size = EVP_MD_size(h);
3885         else if (ssl->s3)
3886                 md_size = ssl->s3->tmp.new_mac_secret_size;
3887         else
3888                 return -1;
3889
3890         wpa_printf(MSG_DEBUG, "OpenSSL: keyblock size: key_len=%d MD_size=%d "
3891                    "IV_len=%d", EVP_CIPHER_key_length(c), md_size,
3892                    EVP_CIPHER_iv_length(c));
3893         return 2 * (EVP_CIPHER_key_length(c) +
3894                     md_size +
3895                     EVP_CIPHER_iv_length(c));
3896 #else
3897         const SSL_CIPHER *ssl_cipher;
3898         int cipher, digest;
3899         const EVP_CIPHER *c;
3900         const EVP_MD *h;
3901
3902         ssl_cipher = SSL_get_current_cipher(ssl);
3903         if (!ssl_cipher)
3904                 return -1;
3905         cipher = SSL_CIPHER_get_cipher_nid(ssl_cipher);
3906         digest = SSL_CIPHER_get_digest_nid(ssl_cipher);
3907         wpa_printf(MSG_DEBUG, "OpenSSL: cipher nid %d digest nid %d",
3908                    cipher, digest);
3909         if (cipher < 0 || digest < 0)
3910                 return -1;
3911         c = EVP_get_cipherbynid(cipher);
3912         h = EVP_get_digestbynid(digest);
3913         if (!c || !h)
3914                 return -1;
3915
3916         wpa_printf(MSG_DEBUG,
3917                    "OpenSSL: keyblock size: key_len=%d MD_size=%d IV_len=%d",
3918                    EVP_CIPHER_key_length(c), EVP_MD_size(h),
3919                    EVP_CIPHER_iv_length(c));
3920         return 2 * (EVP_CIPHER_key_length(c) + EVP_MD_size(h) +
3921                     EVP_CIPHER_iv_length(c));
3922 #endif
3923 }
3924 #endif /* OPENSSL_NEED_EAP_FAST_PRF */
3925
3926
3927 int tls_connection_export_key(void *tls_ctx, struct tls_connection *conn,
3928                               const char *label, const u8 *context,
3929                               size_t context_len, u8 *out, size_t out_len)
3930 {
3931         if (!conn ||
3932             SSL_export_keying_material(conn->ssl, out, out_len, label,
3933                                        os_strlen(label), context, context_len,
3934                                        context != NULL) != 1)
3935                 return -1;
3936         return 0;
3937 }
3938
3939
3940 int tls_connection_get_eap_fast_key(void *tls_ctx, struct tls_connection *conn,
3941                                     u8 *out, size_t out_len)
3942 {
3943 #ifdef OPENSSL_NEED_EAP_FAST_PRF
3944         SSL *ssl;
3945         SSL_SESSION *sess;
3946         u8 *rnd;
3947         int ret = -1;
3948         int skip = 0;
3949         u8 *tmp_out = NULL;
3950         u8 *_out = out;
3951         unsigned char client_random[SSL3_RANDOM_SIZE];
3952         unsigned char server_random[SSL3_RANDOM_SIZE];
3953         unsigned char master_key[64];
3954         size_t master_key_len;
3955         const char *ver;
3956
3957         /*
3958          * TLS library did not support EAP-FAST key generation, so get the
3959          * needed TLS session parameters and use an internal implementation of
3960          * TLS PRF to derive the key.
3961          */
3962
3963         if (conn == NULL)
3964                 return -1;
3965         ssl = conn->ssl;
3966         if (ssl == NULL)
3967                 return -1;
3968         ver = SSL_get_version(ssl);
3969         sess = SSL_get_session(ssl);
3970         if (!ver || !sess)
3971                 return -1;
3972
3973         skip = openssl_get_keyblock_size(ssl);
3974         if (skip < 0)
3975                 return -1;
3976         tmp_out = os_malloc(skip + out_len);
3977         if (!tmp_out)
3978                 return -1;
3979         _out = tmp_out;
3980
3981         rnd = os_malloc(2 * SSL3_RANDOM_SIZE);
3982         if (!rnd) {
3983                 os_free(tmp_out);
3984                 return -1;
3985         }
3986
3987         SSL_get_client_random(ssl, client_random, sizeof(client_random));
3988         SSL_get_server_random(ssl, server_random, sizeof(server_random));
3989         master_key_len = SSL_SESSION_get_master_key(sess, master_key,
3990                                                     sizeof(master_key));
3991
3992         os_memcpy(rnd, server_random, SSL3_RANDOM_SIZE);
3993         os_memcpy(rnd + SSL3_RANDOM_SIZE, client_random, SSL3_RANDOM_SIZE);
3994
3995         if (os_strcmp(ver, "TLSv1.2") == 0) {
3996                 tls_prf_sha256(master_key, master_key_len,
3997                                "key expansion", rnd, 2 * SSL3_RANDOM_SIZE,
3998                                _out, skip + out_len);
3999                 ret = 0;
4000         } else if (tls_prf_sha1_md5(master_key, master_key_len,
4001                                     "key expansion", rnd, 2 * SSL3_RANDOM_SIZE,
4002                                     _out, skip + out_len) == 0) {
4003                 ret = 0;
4004         }
4005         os_memset(master_key, 0, sizeof(master_key));
4006         os_free(rnd);
4007         if (ret == 0)
4008                 os_memcpy(out, _out + skip, out_len);
4009         bin_clear_free(tmp_out, skip);
4010
4011         return ret;
4012 #else /* OPENSSL_NEED_EAP_FAST_PRF */
4013         wpa_printf(MSG_ERROR,
4014                    "OpenSSL: EAP-FAST keys cannot be exported in FIPS mode");
4015         return -1;
4016 #endif /* OPENSSL_NEED_EAP_FAST_PRF */
4017 }
4018
4019
4020 static struct wpabuf *
4021 openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data)
4022 {
4023         int res;
4024         struct wpabuf *out_data;
4025
4026         /*
4027          * Give TLS handshake data from the server (if available) to OpenSSL
4028          * for processing.
4029          */
4030         if (in_data && wpabuf_len(in_data) > 0 &&
4031             BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
4032             < 0) {
4033                 tls_show_errors(MSG_INFO, __func__,
4034                                 "Handshake failed - BIO_write");
4035                 return NULL;
4036         }
4037
4038         /* Initiate TLS handshake or continue the existing handshake */
4039         if (conn->server)
4040                 res = SSL_accept(conn->ssl);
4041         else
4042                 res = SSL_connect(conn->ssl);
4043         if (res != 1) {
4044                 int err = SSL_get_error(conn->ssl, res);
4045                 if (err == SSL_ERROR_WANT_READ)
4046                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
4047                                    "more data");
4048                 else if (err == SSL_ERROR_WANT_WRITE)
4049                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
4050                                    "write");
4051                 else {
4052                         tls_show_errors(MSG_INFO, __func__, "SSL_connect");
4053                         conn->failed++;
4054                         if (!conn->server && !conn->client_hello_generated) {
4055                                 /* The server would not understand TLS Alert
4056                                  * before ClientHello, so simply terminate
4057                                  * handshake on this type of error case caused
4058                                  * by a likely internal error like no ciphers
4059                                  * available. */
4060                                 wpa_printf(MSG_DEBUG,
4061                                            "OpenSSL: Could not generate ClientHello");
4062                                 conn->write_alerts++;
4063                                 return NULL;
4064                         }
4065                 }
4066         }
4067
4068         if (!conn->server && !conn->failed)
4069                 conn->client_hello_generated = 1;
4070
4071 #ifdef CONFIG_SUITEB
4072         if ((conn->flags & TLS_CONN_SUITEB) && !conn->server &&
4073             os_strncmp(SSL_get_cipher(conn->ssl), "DHE-", 4) == 0 &&
4074             conn->server_dh_prime_len < 3072) {
4075                 struct tls_context *context = conn->context;
4076
4077                 /*
4078                  * This should not be reached since earlier cert_cb should have
4079                  * terminated the handshake. Keep this check here for extra
4080                  * protection if anything goes wrong with the more low-level
4081                  * checks based on having to parse the TLS handshake messages.
4082                  */
4083                 wpa_printf(MSG_DEBUG,
4084                            "OpenSSL: Server DH prime length: %d bits",
4085                            conn->server_dh_prime_len);
4086
4087                 if (context->event_cb) {
4088                         union tls_event_data ev;
4089
4090                         os_memset(&ev, 0, sizeof(ev));
4091                         ev.alert.is_local = 1;
4092                         ev.alert.type = "fatal";
4093                         ev.alert.description = "insufficient security";
4094                         context->event_cb(context->cb_ctx, TLS_ALERT, &ev);
4095                 }
4096                 /*
4097                  * Could send a TLS Alert to the server, but for now, simply
4098                  * terminate handshake.
4099                  */
4100                 conn->failed++;
4101                 conn->write_alerts++;
4102                 return NULL;
4103         }
4104 #endif /* CONFIG_SUITEB */
4105
4106         /* Get the TLS handshake data to be sent to the server */
4107         res = BIO_ctrl_pending(conn->ssl_out);
4108         wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
4109         out_data = wpabuf_alloc(res);
4110         if (out_data == NULL) {
4111                 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
4112                            "handshake output (%d bytes)", res);
4113                 if (BIO_reset(conn->ssl_out) < 0) {
4114                         tls_show_errors(MSG_INFO, __func__,
4115                                         "BIO_reset failed");
4116                 }
4117                 return NULL;
4118         }
4119         res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data),
4120                                       res);
4121         if (res < 0) {
4122                 tls_show_errors(MSG_INFO, __func__,
4123                                 "Handshake failed - BIO_read");
4124                 if (BIO_reset(conn->ssl_out) < 0) {
4125                         tls_show_errors(MSG_INFO, __func__,
4126                                         "BIO_reset failed");
4127                 }
4128                 wpabuf_free(out_data);
4129                 return NULL;
4130         }
4131         wpabuf_put(out_data, res);
4132
4133         return out_data;
4134 }
4135
4136
4137 static struct wpabuf *
4138 openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
4139 {
4140         struct wpabuf *appl_data;
4141         int res;
4142
4143         appl_data = wpabuf_alloc(max_len + 100);
4144         if (appl_data == NULL)
4145                 return NULL;
4146
4147         res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
4148                        wpabuf_size(appl_data));
4149         if (res < 0) {
4150                 int err = SSL_get_error(conn->ssl, res);
4151                 if (err == SSL_ERROR_WANT_READ ||
4152                     err == SSL_ERROR_WANT_WRITE) {
4153                         wpa_printf(MSG_DEBUG, "SSL: No Application Data "
4154                                    "included");
4155                 } else {
4156                         tls_show_errors(MSG_INFO, __func__,
4157                                         "Failed to read possible "
4158                                         "Application Data");
4159                 }
4160                 wpabuf_free(appl_data);
4161                 return NULL;
4162         }
4163
4164         wpabuf_put(appl_data, res);
4165         wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
4166                             "message", appl_data);
4167
4168         return appl_data;
4169 }
4170
4171
4172 static struct wpabuf *
4173 openssl_connection_handshake(struct tls_connection *conn,
4174                              const struct wpabuf *in_data,
4175                              struct wpabuf **appl_data)
4176 {
4177         struct wpabuf *out_data;
4178
4179         if (appl_data)
4180                 *appl_data = NULL;
4181
4182         out_data = openssl_handshake(conn, in_data);
4183         if (out_data == NULL)
4184                 return NULL;
4185         if (conn->invalid_hb_used) {
4186                 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
4187                 wpabuf_free(out_data);
4188                 return NULL;
4189         }
4190
4191         if (SSL_is_init_finished(conn->ssl)) {
4192                 wpa_printf(MSG_DEBUG,
4193                            "OpenSSL: Handshake finished - resumed=%d",
4194                            tls_connection_resumed(conn->ssl_ctx, conn));
4195                 if (appl_data && in_data)
4196                         *appl_data = openssl_get_appl_data(conn,
4197                                                            wpabuf_len(in_data));
4198         }
4199
4200         if (conn->invalid_hb_used) {
4201                 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
4202                 if (appl_data) {
4203                         wpabuf_free(*appl_data);
4204                         *appl_data = NULL;
4205                 }
4206                 wpabuf_free(out_data);
4207                 return NULL;
4208         }
4209
4210         return out_data;
4211 }
4212
4213
4214 struct wpabuf *
4215 tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
4216                          const struct wpabuf *in_data,
4217                          struct wpabuf **appl_data)
4218 {
4219         return openssl_connection_handshake(conn, in_data, appl_data);
4220 }
4221
4222
4223 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
4224                                                 struct tls_connection *conn,
4225                                                 const struct wpabuf *in_data,
4226                                                 struct wpabuf **appl_data)
4227 {
4228         conn->server = 1;
4229         return openssl_connection_handshake(conn, in_data, appl_data);
4230 }
4231
4232
4233 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
4234                                        struct tls_connection *conn,
4235                                        const struct wpabuf *in_data)
4236 {
4237         int res;
4238         struct wpabuf *buf;
4239
4240         if (conn == NULL)
4241                 return NULL;
4242
4243         /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
4244         if ((res = BIO_reset(conn->ssl_in)) < 0 ||
4245             (res = BIO_reset(conn->ssl_out)) < 0) {
4246                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
4247                 return NULL;
4248         }
4249         res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
4250         if (res < 0) {
4251                 tls_show_errors(MSG_INFO, __func__,
4252                                 "Encryption failed - SSL_write");
4253                 return NULL;
4254         }
4255
4256         /* Read encrypted data to be sent to the server */
4257         buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
4258         if (buf == NULL)
4259                 return NULL;
4260         res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
4261         if (res < 0) {
4262                 tls_show_errors(MSG_INFO, __func__,
4263                                 "Encryption failed - BIO_read");
4264                 wpabuf_free(buf);
4265                 return NULL;
4266         }
4267         wpabuf_put(buf, res);
4268
4269         return buf;
4270 }
4271
4272
4273 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
4274                                        struct tls_connection *conn,
4275                                        const struct wpabuf *in_data)
4276 {
4277         int res;
4278         struct wpabuf *buf;
4279
4280         /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
4281         res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
4282                         wpabuf_len(in_data));
4283         if (res < 0) {
4284                 tls_show_errors(MSG_INFO, __func__,
4285                                 "Decryption failed - BIO_write");
4286                 return NULL;
4287         }
4288         if (BIO_reset(conn->ssl_out) < 0) {
4289                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
4290                 return NULL;
4291         }
4292
4293         /* Read decrypted data for further processing */
4294         /*
4295          * Even though we try to disable TLS compression, it is possible that
4296          * this cannot be done with all TLS libraries. Add extra buffer space
4297          * to handle the possibility of the decrypted data being longer than
4298          * input data.
4299          */
4300         buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
4301         if (buf == NULL)
4302                 return NULL;
4303         res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
4304         if (res < 0) {
4305                 tls_show_errors(MSG_INFO, __func__,
4306                                 "Decryption failed - SSL_read");
4307                 wpabuf_free(buf);
4308                 return NULL;
4309         }
4310         wpabuf_put(buf, res);
4311
4312         if (conn->invalid_hb_used) {
4313                 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
4314                 wpabuf_free(buf);
4315                 return NULL;
4316         }
4317
4318         return buf;
4319 }
4320
4321
4322 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
4323 {
4324         return conn ? SSL_session_reused(conn->ssl) : 0;
4325 }
4326
4327
4328 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
4329                                    u8 *ciphers)
4330 {
4331         char buf[500], *pos, *end;
4332         u8 *c;
4333         int ret;
4334
4335         if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
4336                 return -1;
4337
4338         buf[0] = '\0';
4339         pos = buf;
4340         end = pos + sizeof(buf);
4341
4342         c = ciphers;
4343         while (*c != TLS_CIPHER_NONE) {
4344                 const char *suite;
4345
4346                 switch (*c) {
4347                 case TLS_CIPHER_RC4_SHA:
4348                         suite = "RC4-SHA";
4349                         break;
4350                 case TLS_CIPHER_AES128_SHA:
4351                         suite = "AES128-SHA";
4352                         break;
4353                 case TLS_CIPHER_RSA_DHE_AES128_SHA:
4354                         suite = "DHE-RSA-AES128-SHA";
4355                         break;
4356                 case TLS_CIPHER_ANON_DH_AES128_SHA:
4357                         suite = "ADH-AES128-SHA";
4358                         break;
4359                 case TLS_CIPHER_RSA_DHE_AES256_SHA:
4360                         suite = "DHE-RSA-AES256-SHA";
4361                         break;
4362                 case TLS_CIPHER_AES256_SHA:
4363                         suite = "AES256-SHA";
4364                         break;
4365                 default:
4366                         wpa_printf(MSG_DEBUG, "TLS: Unsupported "
4367                                    "cipher selection: %d", *c);
4368                         return -1;
4369                 }
4370                 ret = os_snprintf(pos, end - pos, ":%s", suite);
4371                 if (os_snprintf_error(end - pos, ret))
4372                         break;
4373                 pos += ret;
4374
4375                 c++;
4376         }
4377
4378         wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
4379
4380 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
4381 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
4382         if (os_strstr(buf, ":ADH-")) {
4383                 /*
4384                  * Need to drop to security level 0 to allow anonymous
4385                  * cipher suites for EAP-FAST.
4386                  */
4387                 SSL_set_security_level(conn->ssl, 0);
4388         } else if (SSL_get_security_level(conn->ssl) == 0) {
4389                 /* Force at least security level 1 */
4390                 SSL_set_security_level(conn->ssl, 1);
4391         }
4392 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
4393 #endif
4394
4395         if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
4396                 tls_show_errors(MSG_INFO, __func__,
4397                                 "Cipher suite configuration failed");
4398                 return -1;
4399         }
4400
4401         return 0;
4402 }
4403
4404
4405 int tls_get_version(void *ssl_ctx, struct tls_connection *conn,
4406                     char *buf, size_t buflen)
4407 {
4408         const char *name;
4409         if (conn == NULL || conn->ssl == NULL)
4410                 return -1;
4411
4412         name = SSL_get_version(conn->ssl);
4413         if (name == NULL)
4414                 return -1;
4415
4416         os_strlcpy(buf, name, buflen);
4417         return 0;
4418 }
4419
4420
4421 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
4422                    char *buf, size_t buflen)
4423 {
4424         const char *name;
4425         if (conn == NULL || conn->ssl == NULL)
4426                 return -1;
4427
4428         name = SSL_get_cipher(conn->ssl);
4429         if (name == NULL)
4430                 return -1;
4431
4432         os_strlcpy(buf, name, buflen);
4433         return 0;
4434 }
4435
4436
4437 int tls_connection_enable_workaround(void *ssl_ctx,
4438                                      struct tls_connection *conn)
4439 {
4440         SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
4441
4442         return 0;
4443 }
4444
4445
4446 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
4447 /* ClientHello TLS extensions require a patch to openssl, so this function is
4448  * commented out unless explicitly needed for EAP-FAST in order to be able to
4449  * build this file with unmodified openssl. */
4450 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
4451                                     int ext_type, const u8 *data,
4452                                     size_t data_len)
4453 {
4454         if (conn == NULL || conn->ssl == NULL || ext_type != 35)
4455                 return -1;
4456
4457         if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
4458                                        data_len) != 1)
4459                 return -1;
4460
4461         return 0;
4462 }
4463 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
4464
4465
4466 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
4467 {
4468         if (conn == NULL)
4469                 return -1;
4470         return conn->failed;
4471 }
4472
4473
4474 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
4475 {
4476         if (conn == NULL)
4477                 return -1;
4478         return conn->read_alerts;
4479 }
4480
4481
4482 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
4483 {
4484         if (conn == NULL)
4485                 return -1;
4486         return conn->write_alerts;
4487 }
4488
4489
4490 #ifdef HAVE_OCSP
4491
4492 static void ocsp_debug_print_resp(OCSP_RESPONSE *rsp)
4493 {
4494 #ifndef CONFIG_NO_STDOUT_DEBUG
4495         BIO *out;
4496         size_t rlen;
4497         char *txt;
4498         int res;
4499
4500         if (wpa_debug_level > MSG_DEBUG)
4501                 return;
4502
4503         out = BIO_new(BIO_s_mem());
4504         if (!out)
4505                 return;
4506
4507         OCSP_RESPONSE_print(out, rsp, 0);
4508         rlen = BIO_ctrl_pending(out);
4509         txt = os_malloc(rlen + 1);
4510         if (!txt) {
4511                 BIO_free(out);
4512                 return;
4513         }
4514
4515         res = BIO_read(out, txt, rlen);
4516         if (res > 0) {
4517                 txt[res] = '\0';
4518                 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP Response\n%s", txt);
4519         }
4520         os_free(txt);
4521         BIO_free(out);
4522 #endif /* CONFIG_NO_STDOUT_DEBUG */
4523 }
4524
4525
4526 static void debug_print_cert(X509 *cert, const char *title)
4527 {
4528 #ifndef CONFIG_NO_STDOUT_DEBUG
4529         BIO *out;
4530         size_t rlen;
4531         char *txt;
4532         int res;
4533
4534         if (wpa_debug_level > MSG_DEBUG)
4535                 return;
4536
4537         out = BIO_new(BIO_s_mem());
4538         if (!out)
4539                 return;
4540
4541         X509_print(out, cert);
4542         rlen = BIO_ctrl_pending(out);
4543         txt = os_malloc(rlen + 1);
4544         if (!txt) {
4545                 BIO_free(out);
4546                 return;
4547         }
4548
4549         res = BIO_read(out, txt, rlen);
4550         if (res > 0) {
4551                 txt[res] = '\0';
4552                 wpa_printf(MSG_DEBUG, "OpenSSL: %s\n%s", title, txt);
4553         }
4554         os_free(txt);
4555
4556         BIO_free(out);
4557 #endif /* CONFIG_NO_STDOUT_DEBUG */
4558 }
4559
4560
4561 static int ocsp_resp_cb(SSL *s, void *arg)
4562 {
4563         struct tls_connection *conn = arg;
4564         const unsigned char *p;
4565         int len, status, reason, res;
4566         OCSP_RESPONSE *rsp;
4567         OCSP_BASICRESP *basic;
4568         OCSP_CERTID *id;
4569         ASN1_GENERALIZEDTIME *produced_at, *this_update, *next_update;
4570         X509_STORE *store;
4571         STACK_OF(X509) *certs = NULL;
4572
4573         len = SSL_get_tlsext_status_ocsp_resp(s, &p);
4574         if (!p) {
4575                 wpa_printf(MSG_DEBUG, "OpenSSL: No OCSP response received");
4576                 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
4577         }
4578
4579         wpa_hexdump(MSG_DEBUG, "OpenSSL: OCSP response", p, len);
4580
4581         rsp = d2i_OCSP_RESPONSE(NULL, &p, len);
4582         if (!rsp) {
4583                 wpa_printf(MSG_INFO, "OpenSSL: Failed to parse OCSP response");
4584                 return 0;
4585         }
4586
4587         ocsp_debug_print_resp(rsp);
4588
4589         status = OCSP_response_status(rsp);
4590         if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
4591                 wpa_printf(MSG_INFO, "OpenSSL: OCSP responder error %d (%s)",
4592                            status, OCSP_response_status_str(status));
4593                 return 0;
4594         }
4595
4596         basic = OCSP_response_get1_basic(rsp);
4597         if (!basic) {
4598                 wpa_printf(MSG_INFO, "OpenSSL: Could not find BasicOCSPResponse");
4599                 return 0;
4600         }
4601
4602         store = SSL_CTX_get_cert_store(conn->ssl_ctx);
4603         if (conn->peer_issuer) {
4604                 debug_print_cert(conn->peer_issuer, "Add OCSP issuer");
4605
4606                 if (X509_STORE_add_cert(store, conn->peer_issuer) != 1) {
4607                         tls_show_errors(MSG_INFO, __func__,
4608                                         "OpenSSL: Could not add issuer to certificate store");
4609                 }
4610                 certs = sk_X509_new_null();
4611                 if (certs) {
4612                         X509 *cert;
4613                         cert = X509_dup(conn->peer_issuer);
4614                         if (cert && !sk_X509_push(certs, cert)) {
4615                                 tls_show_errors(
4616                                         MSG_INFO, __func__,
4617                                         "OpenSSL: Could not add issuer to OCSP responder trust store");
4618                                 X509_free(cert);
4619                                 sk_X509_free(certs);
4620                                 certs = NULL;
4621                         }
4622                         if (certs && conn->peer_issuer_issuer) {
4623                                 cert = X509_dup(conn->peer_issuer_issuer);
4624                                 if (cert && !sk_X509_push(certs, cert)) {
4625                                         tls_show_errors(
4626                                                 MSG_INFO, __func__,
4627                                                 "OpenSSL: Could not add issuer's issuer to OCSP responder trust store");
4628                                         X509_free(cert);
4629                                 }
4630                         }
4631                 }
4632         }
4633
4634         status = OCSP_basic_verify(basic, certs, store, OCSP_TRUSTOTHER);
4635         sk_X509_pop_free(certs, X509_free);
4636         if (status <= 0) {
4637                 tls_show_errors(MSG_INFO, __func__,
4638                                 "OpenSSL: OCSP response failed verification");
4639                 OCSP_BASICRESP_free(basic);
4640                 OCSP_RESPONSE_free(rsp);
4641                 return 0;
4642         }
4643
4644         wpa_printf(MSG_DEBUG, "OpenSSL: OCSP response verification succeeded");
4645
4646         if (!conn->peer_cert) {
4647                 wpa_printf(MSG_DEBUG, "OpenSSL: Peer certificate not available for OCSP status check");
4648                 OCSP_BASICRESP_free(basic);
4649                 OCSP_RESPONSE_free(rsp);
4650                 return 0;
4651         }
4652
4653         if (!conn->peer_issuer) {
4654                 wpa_printf(MSG_DEBUG, "OpenSSL: Peer issuer certificate not available for OCSP status check");
4655                 OCSP_BASICRESP_free(basic);
4656                 OCSP_RESPONSE_free(rsp);
4657                 return 0;
4658         }
4659
4660         id = OCSP_cert_to_id(EVP_sha256(), conn->peer_cert, conn->peer_issuer);
4661         if (!id) {
4662                 wpa_printf(MSG_DEBUG,
4663                            "OpenSSL: Could not create OCSP certificate identifier (SHA256)");
4664                 OCSP_BASICRESP_free(basic);
4665                 OCSP_RESPONSE_free(rsp);
4666                 return 0;
4667         }
4668
4669         res = OCSP_resp_find_status(basic, id, &status, &reason, &produced_at,
4670                                     &this_update, &next_update);
4671         if (!res) {
4672                 id = OCSP_cert_to_id(NULL, conn->peer_cert, conn->peer_issuer);
4673                 if (!id) {
4674                         wpa_printf(MSG_DEBUG,
4675                                    "OpenSSL: Could not create OCSP certificate identifier (SHA1)");
4676                         OCSP_BASICRESP_free(basic);
4677                         OCSP_RESPONSE_free(rsp);
4678                         return 0;
4679                 }
4680
4681                 res = OCSP_resp_find_status(basic, id, &status, &reason,
4682                                             &produced_at, &this_update,
4683                                             &next_update);
4684         }
4685
4686         if (!res) {
4687                 wpa_printf(MSG_INFO, "OpenSSL: Could not find current server certificate from OCSP response%s",
4688                            (conn->flags & TLS_CONN_REQUIRE_OCSP) ? "" :
4689                            " (OCSP not required)");
4690                 OCSP_CERTID_free(id);
4691                 OCSP_BASICRESP_free(basic);
4692                 OCSP_RESPONSE_free(rsp);
4693                 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
4694         }
4695         OCSP_CERTID_free(id);
4696
4697         if (!OCSP_check_validity(this_update, next_update, 5 * 60, -1)) {
4698                 tls_show_errors(MSG_INFO, __func__,
4699                                 "OpenSSL: OCSP status times invalid");
4700                 OCSP_BASICRESP_free(basic);
4701                 OCSP_RESPONSE_free(rsp);
4702                 return 0;
4703         }
4704
4705         OCSP_BASICRESP_free(basic);
4706         OCSP_RESPONSE_free(rsp);
4707
4708         wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status for server certificate: %s",
4709                    OCSP_cert_status_str(status));
4710
4711         if (status == V_OCSP_CERTSTATUS_GOOD)
4712                 return 1;
4713         if (status == V_OCSP_CERTSTATUS_REVOKED)
4714                 return 0;
4715         if (conn->flags & TLS_CONN_REQUIRE_OCSP) {
4716                 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP required");
4717                 return 0;
4718         }
4719         wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP was not required, so allow connection to continue");
4720         return 1;
4721 }
4722
4723
4724 static int ocsp_status_cb(SSL *s, void *arg)
4725 {
4726         char *tmp;
4727         char *resp;
4728         size_t len;
4729
4730         if (tls_global->ocsp_stapling_response == NULL) {
4731                 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - no response configured");
4732                 return SSL_TLSEXT_ERR_OK;
4733         }
4734
4735         resp = os_readfile(tls_global->ocsp_stapling_response, &len);
4736         if (resp == NULL) {
4737                 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - could not read response file");
4738                 /* TODO: Build OCSPResponse with responseStatus = internalError
4739                  */
4740                 return SSL_TLSEXT_ERR_OK;
4741         }
4742         wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - send cached response");
4743         tmp = OPENSSL_malloc(len);
4744         if (tmp == NULL) {
4745                 os_free(resp);
4746                 return SSL_TLSEXT_ERR_ALERT_FATAL;
4747         }
4748
4749         os_memcpy(tmp, resp, len);
4750         os_free(resp);
4751         SSL_set_tlsext_status_ocsp_resp(s, tmp, len);
4752
4753         return SSL_TLSEXT_ERR_OK;
4754 }
4755
4756 #endif /* HAVE_OCSP */
4757
4758
4759 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
4760                               const struct tls_connection_params *params)
4761 {
4762         struct tls_data *data = tls_ctx;
4763         int ret;
4764         unsigned long err;
4765         int can_pkcs11 = 0;
4766         const char *key_id = params->key_id;
4767         const char *cert_id = params->cert_id;
4768         const char *ca_cert_id = params->ca_cert_id;
4769         const char *engine_id = params->engine ? params->engine_id : NULL;
4770         const char *ciphers;
4771
4772         if (conn == NULL)
4773                 return -1;
4774
4775         if (params->flags & TLS_CONN_REQUIRE_OCSP_ALL) {
4776                 wpa_printf(MSG_INFO,
4777                            "OpenSSL: ocsp=3 not supported");
4778                 return -1;
4779         }
4780
4781         /*
4782          * If the engine isn't explicitly configured, and any of the
4783          * cert/key fields are actually PKCS#11 URIs, then automatically
4784          * use the PKCS#11 ENGINE.
4785          */
4786         if (!engine_id || os_strcmp(engine_id, "pkcs11") == 0)
4787                 can_pkcs11 = 1;
4788
4789         if (!key_id && params->private_key && can_pkcs11 &&
4790             os_strncmp(params->private_key, "pkcs11:", 7) == 0) {
4791                 can_pkcs11 = 2;
4792                 key_id = params->private_key;
4793         }
4794
4795         if (!cert_id && params->client_cert && can_pkcs11 &&
4796             os_strncmp(params->client_cert, "pkcs11:", 7) == 0) {
4797                 can_pkcs11 = 2;
4798                 cert_id = params->client_cert;
4799         }
4800
4801         if (!ca_cert_id && params->ca_cert && can_pkcs11 &&
4802             os_strncmp(params->ca_cert, "pkcs11:", 7) == 0) {
4803                 can_pkcs11 = 2;
4804                 ca_cert_id = params->ca_cert;
4805         }
4806
4807         /* If we need to automatically enable the PKCS#11 ENGINE, do so. */
4808         if (can_pkcs11 == 2 && !engine_id)
4809                 engine_id = "pkcs11";
4810
4811 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
4812 #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
4813         if (params->flags & TLS_CONN_EAP_FAST) {
4814                 wpa_printf(MSG_DEBUG,
4815                            "OpenSSL: Use TLSv1_method() for EAP-FAST");
4816                 if (SSL_set_ssl_method(conn->ssl, TLSv1_method()) != 1) {
4817                         tls_show_errors(MSG_INFO, __func__,
4818                                         "Failed to set TLSv1_method() for EAP-FAST");
4819                         return -1;
4820                 }
4821         }
4822 #endif
4823 #if OPENSSL_VERSION_NUMBER >= 0x10101000L
4824 #ifdef SSL_OP_NO_TLSv1_3
4825         if (params->flags & TLS_CONN_EAP_FAST) {
4826                 /* Need to disable TLS v1.3 at least for now since OpenSSL 1.1.1
4827                  * refuses to start the handshake with the modified ciphersuite
4828                  * list (no TLS v1.3 ciphersuites included) for EAP-FAST. */
4829                 wpa_printf(MSG_DEBUG, "OpenSSL: Disable TLSv1.3 for EAP-FAST");
4830                 SSL_set_options(conn->ssl, SSL_OP_NO_TLSv1_3);
4831         }
4832 #endif /* SSL_OP_NO_TLSv1_3 */
4833 #endif
4834 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
4835
4836         while ((err = ERR_get_error())) {
4837                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
4838                            __func__, ERR_error_string(err, NULL));
4839         }
4840
4841         if (engine_id) {
4842                 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
4843                 ret = tls_engine_init(conn, engine_id, params->pin,
4844                                       key_id, cert_id, ca_cert_id);
4845                 if (ret)
4846                         return ret;
4847         }
4848         if (tls_connection_set_subject_match(conn,
4849                                              params->subject_match,
4850                                              params->altsubject_match,
4851                                              params->suffix_match,
4852                                              params->domain_match,
4853                                              params->check_cert_subject))
4854                 return -1;
4855
4856         if (engine_id && ca_cert_id) {
4857                 if (tls_connection_engine_ca_cert(data, conn, ca_cert_id))
4858                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
4859         } else if (tls_connection_ca_cert(data, conn, params->ca_cert,
4860                                           params->ca_cert_blob,
4861                                           params->ca_cert_blob_len,
4862                                           params->ca_path))
4863                 return -1;
4864
4865         if (engine_id && cert_id) {
4866                 if (tls_connection_engine_client_cert(conn, cert_id))
4867                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
4868         } else if (tls_connection_client_cert(conn, params->client_cert,
4869                                               params->client_cert_blob,
4870                                               params->client_cert_blob_len))
4871                 return -1;
4872
4873         if (engine_id && key_id) {
4874                 wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
4875                 if (tls_connection_engine_private_key(conn))
4876                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
4877         } else if (tls_connection_private_key(data, conn,
4878                                               params->private_key,
4879                                               params->private_key_passwd,
4880                                               params->private_key_blob,
4881                                               params->private_key_blob_len)) {
4882                 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
4883                            params->private_key);
4884                 return -1;
4885         }
4886
4887         if (tls_connection_dh(conn, params->dh_file)) {
4888                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
4889                            params->dh_file);
4890                 return -1;
4891         }
4892
4893         ciphers = params->openssl_ciphers;
4894 #ifdef CONFIG_SUITEB
4895 #ifdef OPENSSL_IS_BORINGSSL
4896         if (ciphers && os_strcmp(ciphers, "SUITEB192") == 0) {
4897                 /* BoringSSL removed support for SUITEB192, so need to handle
4898                  * this with hardcoded ciphersuite and additional checks for
4899                  * other parameters. */
4900                 ciphers = "ECDHE-ECDSA-AES256-GCM-SHA384";
4901         }
4902 #endif /* OPENSSL_IS_BORINGSSL */
4903 #endif /* CONFIG_SUITEB */
4904         if (ciphers && SSL_set_cipher_list(conn->ssl, ciphers) != 1) {
4905                 wpa_printf(MSG_INFO,
4906                            "OpenSSL: Failed to set cipher string '%s'",
4907                            ciphers);
4908                 return -1;
4909         }
4910
4911         if (!params->openssl_ecdh_curves) {
4912 #ifndef OPENSSL_IS_BORINGSSL
4913 #ifndef OPENSSL_NO_EC
4914 #if (OPENSSL_VERSION_NUMBER >= 0x10002000L) && \
4915         (OPENSSL_VERSION_NUMBER < 0x10100000L)
4916                 if (SSL_set_ecdh_auto(conn->ssl, 1) != 1) {
4917                         wpa_printf(MSG_INFO,
4918                                    "OpenSSL: Failed to set ECDH curves to auto");
4919                         return -1;
4920                 }
4921 #endif /* >= 1.0.2 && < 1.1.0 */
4922 #endif /* OPENSSL_NO_EC */
4923 #endif /* OPENSSL_IS_BORINGSSL */
4924         } else if (params->openssl_ecdh_curves[0]) {
4925 #if defined(OPENSSL_IS_BORINGSSL) || (OPENSSL_VERSION_NUMBER < 0x10002000L)
4926                 wpa_printf(MSG_INFO,
4927                         "OpenSSL: ECDH configuration nnot supported");
4928                 return -1;
4929 #else /* OPENSSL_IS_BORINGSSL || < 1.0.2 */
4930 #ifndef OPENSSL_NO_EC
4931                 if (SSL_set1_curves_list(conn->ssl,
4932                                          params->openssl_ecdh_curves) != 1) {
4933                         wpa_printf(MSG_INFO,
4934                                    "OpenSSL: Failed to set ECDH curves '%s'",
4935                                    params->openssl_ecdh_curves);
4936                         return -1;
4937                 }
4938 #else /* OPENSSL_NO_EC */
4939                 wpa_printf(MSG_INFO, "OpenSSL: ECDH not supported");
4940                 return -1;
4941 #endif /* OPENSSL_NO_EC */
4942 #endif /* OPENSSL_IS_BORINGSSL */
4943         }
4944
4945         if (tls_set_conn_flags(conn, params->flags,
4946                                params->openssl_ciphers) < 0)
4947                 return -1;
4948
4949 #ifdef OPENSSL_IS_BORINGSSL
4950         if (params->flags & TLS_CONN_REQUEST_OCSP) {
4951                 SSL_enable_ocsp_stapling(conn->ssl);
4952         }
4953 #else /* OPENSSL_IS_BORINGSSL */
4954 #ifdef HAVE_OCSP
4955         if (params->flags & TLS_CONN_REQUEST_OCSP) {
4956                 SSL_CTX *ssl_ctx = data->ssl;
4957                 SSL_set_tlsext_status_type(conn->ssl, TLSEXT_STATUSTYPE_ocsp);
4958                 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_resp_cb);
4959                 SSL_CTX_set_tlsext_status_arg(ssl_ctx, conn);
4960         }
4961 #else /* HAVE_OCSP */
4962         if (params->flags & TLS_CONN_REQUIRE_OCSP) {
4963                 wpa_printf(MSG_INFO,
4964                            "OpenSSL: No OCSP support included - reject configuration");
4965                 return -1;
4966         }
4967         if (params->flags & TLS_CONN_REQUEST_OCSP) {
4968                 wpa_printf(MSG_DEBUG,
4969                            "OpenSSL: No OCSP support included - allow optional OCSP case to continue");
4970         }
4971 #endif /* HAVE_OCSP */
4972 #endif /* OPENSSL_IS_BORINGSSL */
4973
4974         conn->flags = params->flags;
4975
4976         tls_get_errors(data);
4977
4978         return 0;
4979 }
4980
4981
4982 int tls_global_set_params(void *tls_ctx,
4983                           const struct tls_connection_params *params)
4984 {
4985         struct tls_data *data = tls_ctx;
4986         SSL_CTX *ssl_ctx = data->ssl;
4987         unsigned long err;
4988
4989         while ((err = ERR_get_error())) {
4990                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
4991                            __func__, ERR_error_string(err, NULL));
4992         }
4993
4994         os_free(data->check_cert_subject);
4995         data->check_cert_subject = NULL;
4996         if (params->check_cert_subject) {
4997                 data->check_cert_subject =
4998                         os_strdup(params->check_cert_subject);
4999                 if (!data->check_cert_subject)
5000                         return -1;
5001         }
5002
5003         if (tls_global_ca_cert(data, params->ca_cert) ||
5004             tls_global_client_cert(data, params->client_cert) ||
5005             tls_global_private_key(data, params->private_key,
5006                                    params->private_key_passwd) ||
5007             tls_global_dh(data, params->dh_file)) {
5008                 wpa_printf(MSG_INFO, "TLS: Failed to set global parameters");
5009                 return -1;
5010         }
5011
5012         if (params->openssl_ciphers &&
5013             SSL_CTX_set_cipher_list(ssl_ctx, params->openssl_ciphers) != 1) {
5014                 wpa_printf(MSG_INFO,
5015                            "OpenSSL: Failed to set cipher string '%s'",
5016                            params->openssl_ciphers);
5017                 return -1;
5018         }
5019
5020         if (!params->openssl_ecdh_curves) {
5021 #ifndef OPENSSL_IS_BORINGSSL
5022 #ifndef OPENSSL_NO_EC
5023 #if (OPENSSL_VERSION_NUMBER >= 0x10002000L) && \
5024         (OPENSSL_VERSION_NUMBER < 0x10100000L)
5025                 if (SSL_CTX_set_ecdh_auto(ssl_ctx, 1) != 1) {
5026                         wpa_printf(MSG_INFO,
5027                                    "OpenSSL: Failed to set ECDH curves to auto");
5028                         return -1;
5029                 }
5030 #endif /* >= 1.0.2 && < 1.1.0 */
5031 #endif /* OPENSSL_NO_EC */
5032 #endif /* OPENSSL_IS_BORINGSSL */
5033         } else if (params->openssl_ecdh_curves[0]) {
5034 #if defined(OPENSSL_IS_BORINGSSL) || (OPENSSL_VERSION_NUMBER < 0x10002000L)
5035                 wpa_printf(MSG_INFO,
5036                         "OpenSSL: ECDH configuration nnot supported");
5037                 return -1;
5038 #else /* OPENSSL_IS_BORINGSSL || < 1.0.2 */
5039 #ifndef OPENSSL_NO_EC
5040 #if OPENSSL_VERSION_NUMBER < 0x10100000L
5041                 SSL_CTX_set_ecdh_auto(ssl_ctx, 1);
5042 #endif
5043                 if (SSL_CTX_set1_curves_list(ssl_ctx,
5044                                              params->openssl_ecdh_curves) !=
5045                     1) {
5046                         wpa_printf(MSG_INFO,
5047                                    "OpenSSL: Failed to set ECDH curves '%s'",
5048                                    params->openssl_ecdh_curves);
5049                         return -1;
5050                 }
5051 #else /* OPENSSL_NO_EC */
5052                 wpa_printf(MSG_INFO, "OpenSSL: ECDH not supported");
5053                 return -1;
5054 #endif /* OPENSSL_NO_EC */
5055 #endif /* OPENSSL_IS_BORINGSSL */
5056         }
5057
5058 #ifdef SSL_OP_NO_TICKET
5059         if (params->flags & TLS_CONN_DISABLE_SESSION_TICKET)
5060                 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET);
5061         else
5062                 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TICKET);
5063 #endif /*  SSL_OP_NO_TICKET */
5064
5065 #ifdef HAVE_OCSP
5066         SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_status_cb);
5067         SSL_CTX_set_tlsext_status_arg(ssl_ctx, ssl_ctx);
5068         os_free(tls_global->ocsp_stapling_response);
5069         if (params->ocsp_stapling_response)
5070                 tls_global->ocsp_stapling_response =
5071                         os_strdup(params->ocsp_stapling_response);
5072         else
5073                 tls_global->ocsp_stapling_response = NULL;
5074 #endif /* HAVE_OCSP */
5075
5076         return 0;
5077 }
5078
5079
5080 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
5081 /* Pre-shared secred requires a patch to openssl, so this function is
5082  * commented out unless explicitly needed for EAP-FAST in order to be able to
5083  * build this file with unmodified openssl. */
5084
5085 #if (defined(OPENSSL_IS_BORINGSSL) || OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
5086 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
5087                            STACK_OF(SSL_CIPHER) *peer_ciphers,
5088                            const SSL_CIPHER **cipher, void *arg)
5089 #else /* OPENSSL_IS_BORINGSSL */
5090 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
5091                            STACK_OF(SSL_CIPHER) *peer_ciphers,
5092                            SSL_CIPHER **cipher, void *arg)
5093 #endif /* OPENSSL_IS_BORINGSSL */
5094 {
5095         struct tls_connection *conn = arg;
5096         int ret;
5097
5098 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
5099         (defined(LIBRESSL_VERSION_NUMBER) && \
5100          LIBRESSL_VERSION_NUMBER < 0x20700000L)
5101         if (conn == NULL || conn->session_ticket_cb == NULL)
5102                 return 0;
5103
5104         ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
5105                                       conn->session_ticket,
5106                                       conn->session_ticket_len,
5107                                       s->s3->client_random,
5108                                       s->s3->server_random, secret);
5109 #else
5110         unsigned char client_random[SSL3_RANDOM_SIZE];
5111         unsigned char server_random[SSL3_RANDOM_SIZE];
5112
5113         if (conn == NULL || conn->session_ticket_cb == NULL)
5114                 return 0;
5115
5116         SSL_get_client_random(s, client_random, sizeof(client_random));
5117         SSL_get_server_random(s, server_random, sizeof(server_random));
5118
5119         ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
5120                                       conn->session_ticket,
5121                                       conn->session_ticket_len,
5122                                       client_random,
5123                                       server_random, secret);
5124 #endif
5125
5126         os_free(conn->session_ticket);
5127         conn->session_ticket = NULL;
5128
5129         if (ret <= 0)
5130                 return 0;
5131
5132         *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
5133         return 1;
5134 }
5135
5136
5137 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
5138                                      int len, void *arg)
5139 {
5140         struct tls_connection *conn = arg;
5141
5142         if (conn == NULL || conn->session_ticket_cb == NULL)
5143                 return 0;
5144
5145         wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
5146
5147         os_free(conn->session_ticket);
5148         conn->session_ticket = NULL;
5149
5150         wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
5151                     "extension", data, len);
5152
5153         conn->session_ticket = os_memdup(data, len);
5154         if (conn->session_ticket == NULL)
5155                 return 0;
5156
5157         conn->session_ticket_len = len;
5158
5159         return 1;
5160 }
5161 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
5162
5163
5164 int tls_connection_set_session_ticket_cb(void *tls_ctx,
5165                                          struct tls_connection *conn,
5166                                          tls_session_ticket_cb cb,
5167                                          void *ctx)
5168 {
5169 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
5170         conn->session_ticket_cb = cb;
5171         conn->session_ticket_cb_ctx = ctx;
5172
5173         if (cb) {
5174                 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
5175                                               conn) != 1)
5176                         return -1;
5177                 SSL_set_session_ticket_ext_cb(conn->ssl,
5178                                               tls_session_ticket_ext_cb, conn);
5179         } else {
5180                 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
5181                         return -1;
5182                 SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
5183         }
5184
5185         return 0;
5186 #else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
5187         return -1;
5188 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
5189 }
5190
5191
5192 int tls_get_library_version(char *buf, size_t buf_len)
5193 {
5194 #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
5195         return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
5196                            OPENSSL_VERSION_TEXT,
5197                            OpenSSL_version(OPENSSL_VERSION));
5198 #else
5199         return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
5200                            OPENSSL_VERSION_TEXT,
5201                            SSLeay_version(SSLEAY_VERSION));
5202 #endif
5203 }
5204
5205
5206 void tls_connection_set_success_data(struct tls_connection *conn,
5207                                      struct wpabuf *data)
5208 {
5209         SSL_SESSION *sess;
5210         struct wpabuf *old;
5211
5212         if (tls_ex_idx_session < 0)
5213                 goto fail;
5214         sess = SSL_get_session(conn->ssl);
5215         if (!sess)
5216                 goto fail;
5217         old = SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
5218         if (old) {
5219                 wpa_printf(MSG_DEBUG, "OpenSSL: Replacing old success data %p",
5220                            old);
5221                 wpabuf_free(old);
5222         }
5223         if (SSL_SESSION_set_ex_data(sess, tls_ex_idx_session, data) != 1)
5224                 goto fail;
5225
5226         wpa_printf(MSG_DEBUG, "OpenSSL: Stored success data %p", data);
5227         conn->success_data = 1;
5228         return;
5229
5230 fail:
5231         wpa_printf(MSG_INFO, "OpenSSL: Failed to store success data");
5232         wpabuf_free(data);
5233 }
5234
5235
5236 void tls_connection_set_success_data_resumed(struct tls_connection *conn)
5237 {
5238         wpa_printf(MSG_DEBUG,
5239                    "OpenSSL: Success data accepted for resumed session");
5240         conn->success_data = 1;
5241 }
5242
5243
5244 const struct wpabuf *
5245 tls_connection_get_success_data(struct tls_connection *conn)
5246 {
5247         SSL_SESSION *sess;
5248
5249         if (tls_ex_idx_session < 0 ||
5250             !(sess = SSL_get_session(conn->ssl)))
5251                 return NULL;
5252         return SSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
5253 }
5254
5255
5256 void tls_connection_remove_session(struct tls_connection *conn)
5257 {
5258         SSL_SESSION *sess;
5259
5260         sess = SSL_get_session(conn->ssl);
5261         if (!sess)
5262                 return;
5263
5264         if (SSL_CTX_remove_session(conn->ssl_ctx, sess) != 1)
5265                 wpa_printf(MSG_DEBUG,
5266                            "OpenSSL: Session was not cached");
5267         else
5268                 wpa_printf(MSG_DEBUG,
5269                            "OpenSSL: Removed cached session to disable session resumption");
5270 }