contrib/wpa/src/crypto/tls_openssl.c

   1 /*
   2  * SSL/TLS interface functions for OpenSSL
   3  * Copyright (c) 2004-2013, 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/pkcs12.h>
  22 #include <openssl/x509v3.h>
  23 #ifndef OPENSSL_NO_ENGINE
  24 #include <openssl/engine.h>
  25 #endif /* OPENSSL_NO_ENGINE */
  26
  27 #include "common.h"
  28 #include "crypto.h"
  29 #include "tls.h"
  30
  31 #if defined(SSL_CTX_get_app_data) && defined(SSL_CTX_set_app_data)
  32 #define OPENSSL_SUPPORTS_CTX_APP_DATA
  33 #endif
  34
  35 #if OPENSSL_VERSION_NUMBER < 0x10000000L
  36 /* ERR_remove_thread_state replaces ERR_remove_state and the latter is
  37  * deprecated. However, OpenSSL 0.9.8 doesn't include
  38  * ERR_remove_thread_state. */
  39 #define ERR_remove_thread_state(tid) ERR_remove_state(0)
  40 #endif
  41
  42 #if defined(OPENSSL_IS_BORINGSSL)
  43 /* stack_index_t is the return type of OpenSSL's sk_XXX_num() functions. */
  44 typedef size_t stack_index_t;
  45 #else
  46 typedef int stack_index_t;
  47 #endif
  48
  49 #ifdef SSL_set_tlsext_status_type
  50 #ifndef OPENSSL_NO_TLSEXT
  51 #define HAVE_OCSP
  52 #include <openssl/ocsp.h>
  53 #endif /* OPENSSL_NO_TLSEXT */
  54 #endif /* SSL_set_tlsext_status_type */
  55
  56 #ifdef ANDROID
  57 #include <openssl/pem.h>
  58 #include <keystore/keystore_get.h>
  59
  60 static BIO * BIO_from_keystore(const char *key)
  61 {
  62         BIO *bio = NULL;
  63         uint8_t *value = NULL;
  64         int length = keystore_get(key, strlen(key), &value);
  65         if (length != -1 && (bio = BIO_new(BIO_s_mem())) != NULL)
  66                 BIO_write(bio, value, length);
  67         free(value);
  68         return bio;
  69 }
  70 #endif /* ANDROID */
  71
  72 static int tls_openssl_ref_count = 0;
  73
  74 struct tls_context {
  75         void (*event_cb)(void *ctx, enum tls_event ev,
  76                          union tls_event_data *data);
  77         void *cb_ctx;
  78         int cert_in_cb;
  79         char *ocsp_stapling_response;
  80 };
  81
  82 static struct tls_context *tls_global = NULL;
  83
  84
  85 struct tls_connection {
  86         struct tls_context *context;
  87         SSL_CTX *ssl_ctx;
  88         SSL *ssl;
  89         BIO *ssl_in, *ssl_out;
  90 #ifndef OPENSSL_NO_ENGINE
  91         ENGINE *engine;        /* functional reference to the engine */
  92         EVP_PKEY *private_key; /* the private key if using engine */
  93 #endif /* OPENSSL_NO_ENGINE */
  94         char *subject_match, *altsubject_match, *suffix_match, *domain_match;
  95         int read_alerts, write_alerts, failed;
  96
  97         tls_session_ticket_cb session_ticket_cb;
  98         void *session_ticket_cb_ctx;
  99
 100         /* SessionTicket received from OpenSSL hello_extension_cb (server) */
 101         u8 *session_ticket;
 102         size_t session_ticket_len;
 103
 104         unsigned int ca_cert_verify:1;
 105         unsigned int cert_probe:1;
 106         unsigned int server_cert_only:1;
 107         unsigned int invalid_hb_used:1;
 108
 109         u8 srv_cert_hash[32];
 110
 111         unsigned int flags;
 112
 113         X509 *peer_cert;
 114         X509 *peer_issuer;
 115         X509 *peer_issuer_issuer;
 116 };
 117
 118
 119 static struct tls_context * tls_context_new(const struct tls_config *conf)
 120 {
 121         struct tls_context *context = os_zalloc(sizeof(*context));
 122         if (context == NULL)
 123                 return NULL;
 124         if (conf) {
 125                 context->event_cb = conf->event_cb;
 126                 context->cb_ctx = conf->cb_ctx;
 127                 context->cert_in_cb = conf->cert_in_cb;
 128         }
 129         return context;
 130 }
 131
 132
 133 #ifdef CONFIG_NO_STDOUT_DEBUG
 134
 135 static void _tls_show_errors(void)
 136 {
 137         unsigned long err;
 138
 139         while ((err = ERR_get_error())) {
 140                 /* Just ignore the errors, since stdout is disabled */
 141         }
 142 }
 143 #define tls_show_errors(l, f, t) _tls_show_errors()
 144
 145 #else /* CONFIG_NO_STDOUT_DEBUG */
 146
 147 static void tls_show_errors(int level, const char *func, const char *txt)
 148 {
 149         unsigned long err;
 150
 151         wpa_printf(level, "OpenSSL: %s - %s %s",
 152                    func, txt, ERR_error_string(ERR_get_error(), NULL));
 153
 154         while ((err = ERR_get_error())) {
 155                 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
 156                            ERR_error_string(err, NULL));
 157         }
 158 }
 159
 160 #endif /* CONFIG_NO_STDOUT_DEBUG */
 161
 162
 163 #ifdef CONFIG_NATIVE_WINDOWS
 164
 165 /* Windows CryptoAPI and access to certificate stores */
 166 #include <wincrypt.h>
 167
 168 #ifdef __MINGW32_VERSION
 169 /*
 170  * MinGW does not yet include all the needed definitions for CryptoAPI, so
 171  * define here whatever extra is needed.
 172  */
 173 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
 174 #define CERT_STORE_READONLY_FLAG 0x00008000
 175 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
 176
 177 #endif /* __MINGW32_VERSION */
 178
 179
 180 struct cryptoapi_rsa_data {
 181         const CERT_CONTEXT *cert;
 182         HCRYPTPROV crypt_prov;
 183         DWORD key_spec;
 184         BOOL free_crypt_prov;
 185 };
 186
 187
 188 static void cryptoapi_error(const char *msg)
 189 {
 190         wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
 191                    msg, (unsigned int) GetLastError());
 192 }
 193
 194
 195 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
 196                                  unsigned char *to, RSA *rsa, int padding)
 197 {
 198         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 199         return 0;
 200 }
 201
 202
 203 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
 204                                  unsigned char *to, RSA *rsa, int padding)
 205 {
 206         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 207         return 0;
 208 }
 209
 210
 211 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
 212                                   unsigned char *to, RSA *rsa, int padding)
 213 {
 214         struct cryptoapi_rsa_data *priv =
 215                 (struct cryptoapi_rsa_data *) rsa->meth->app_data;
 216         HCRYPTHASH hash;
 217         DWORD hash_size, len, i;
 218         unsigned char *buf = NULL;
 219         int ret = 0;
 220
 221         if (priv == NULL) {
 222                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 223                        ERR_R_PASSED_NULL_PARAMETER);
 224                 return 0;
 225         }
 226
 227         if (padding != RSA_PKCS1_PADDING) {
 228                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 229                        RSA_R_UNKNOWN_PADDING_TYPE);
 230                 return 0;
 231         }
 232
 233         if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
 234                 wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
 235                            __func__);
 236                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 237                        RSA_R_INVALID_MESSAGE_LENGTH);
 238                 return 0;
 239         }
 240
 241         if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
 242         {
 243                 cryptoapi_error("CryptCreateHash failed");
 244                 return 0;
 245         }
 246
 247         len = sizeof(hash_size);
 248         if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
 249                                0)) {
 250                 cryptoapi_error("CryptGetHashParam failed");
 251                 goto err;
 252         }
 253
 254         if ((int) hash_size != flen) {
 255                 wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
 256                            (unsigned) hash_size, flen);
 257                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 258                        RSA_R_INVALID_MESSAGE_LENGTH);
 259                 goto err;
 260         }
 261         if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
 262                 cryptoapi_error("CryptSetHashParam failed");
 263                 goto err;
 264         }
 265
 266         len = RSA_size(rsa);
 267         buf = os_malloc(len);
 268         if (buf == NULL) {
 269                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
 270                 goto err;
 271         }
 272
 273         if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
 274                 cryptoapi_error("CryptSignHash failed");
 275                 goto err;
 276         }
 277
 278         for (i = 0; i < len; i++)
 279                 to[i] = buf[len - i - 1];
 280         ret = len;
 281
 282 err:
 283         os_free(buf);
 284         CryptDestroyHash(hash);
 285
 286         return ret;
 287 }
 288
 289
 290 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
 291                                   unsigned char *to, RSA *rsa, int padding)
 292 {
 293         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 294         return 0;
 295 }
 296
 297
 298 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
 299 {
 300         if (priv == NULL)
 301                 return;
 302         if (priv->crypt_prov && priv->free_crypt_prov)
 303                 CryptReleaseContext(priv->crypt_prov, 0);
 304         if (priv->cert)
 305                 CertFreeCertificateContext(priv->cert);
 306         os_free(priv);
 307 }
 308
 309
 310 static int cryptoapi_finish(RSA *rsa)
 311 {
 312         cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
 313         os_free((void *) rsa->meth);
 314         rsa->meth = NULL;
 315         return 1;
 316 }
 317
 318
 319 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
 320 {
 321         HCERTSTORE cs;
 322         const CERT_CONTEXT *ret = NULL;
 323
 324         cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
 325                            store | CERT_STORE_OPEN_EXISTING_FLAG |
 326                            CERT_STORE_READONLY_FLAG, L"MY");
 327         if (cs == NULL) {
 328                 cryptoapi_error("Failed to open 'My system store'");
 329                 return NULL;
 330         }
 331
 332         if (strncmp(name, "cert://", 7) == 0) {
 333                 unsigned short wbuf[255];
 334                 MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
 335                 ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
 336                                                  PKCS_7_ASN_ENCODING,
 337                                                  0, CERT_FIND_SUBJECT_STR,
 338                                                  wbuf, NULL);
 339         } else if (strncmp(name, "hash://", 7) == 0) {
 340                 CRYPT_HASH_BLOB blob;
 341                 int len;
 342                 const char *hash = name + 7;
 343                 unsigned char *buf;
 344
 345                 len = os_strlen(hash) / 2;
 346                 buf = os_malloc(len);
 347                 if (buf && hexstr2bin(hash, buf, len) == 0) {
 348                         blob.cbData = len;
 349                         blob.pbData = buf;
 350                         ret = CertFindCertificateInStore(cs,
 351                                                          X509_ASN_ENCODING |
 352                                                          PKCS_7_ASN_ENCODING,
 353                                                          0, CERT_FIND_HASH,
 354                                                          &blob, NULL);
 355                 }
 356                 os_free(buf);
 357         }
 358
 359         CertCloseStore(cs, 0);
 360
 361         return ret;
 362 }
 363
 364
 365 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 366 {
 367         X509 *cert = NULL;
 368         RSA *rsa = NULL, *pub_rsa;
 369         struct cryptoapi_rsa_data *priv;
 370         RSA_METHOD *rsa_meth;
 371
 372         if (name == NULL ||
 373             (strncmp(name, "cert://", 7) != 0 &&
 374              strncmp(name, "hash://", 7) != 0))
 375                 return -1;
 376
 377         priv = os_zalloc(sizeof(*priv));
 378         rsa_meth = os_zalloc(sizeof(*rsa_meth));
 379         if (priv == NULL || rsa_meth == NULL) {
 380                 wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
 381                            "for CryptoAPI RSA method");
 382                 os_free(priv);
 383                 os_free(rsa_meth);
 384                 return -1;
 385         }
 386
 387         priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
 388         if (priv->cert == NULL) {
 389                 priv->cert = cryptoapi_find_cert(
 390                         name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
 391         }
 392         if (priv->cert == NULL) {
 393                 wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
 394                            "'%s'", name);
 395                 goto err;
 396         }
 397
 398         cert = d2i_X509(NULL,
 399                         (const unsigned char **) &priv->cert->pbCertEncoded,
 400                         priv->cert->cbCertEncoded);
 401         if (cert == NULL) {
 402                 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
 403                            "encoding");
 404                 goto err;
 405         }
 406
 407         if (!CryptAcquireCertificatePrivateKey(priv->cert,
 408                                                CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
 409                                                NULL, &priv->crypt_prov,
 410                                                &priv->key_spec,
 411                                                &priv->free_crypt_prov)) {
 412                 cryptoapi_error("Failed to acquire a private key for the "
 413                                 "certificate");
 414                 goto err;
 415         }
 416
 417         rsa_meth->name = "Microsoft CryptoAPI RSA Method";
 418         rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
 419         rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
 420         rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
 421         rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
 422         rsa_meth->finish = cryptoapi_finish;
 423         rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
 424         rsa_meth->app_data = (char *) priv;
 425
 426         rsa = RSA_new();
 427         if (rsa == NULL) {
 428                 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
 429                        ERR_R_MALLOC_FAILURE);
 430                 goto err;
 431         }
 432
 433         if (!SSL_use_certificate(ssl, cert)) {
 434                 RSA_free(rsa);
 435                 rsa = NULL;
 436                 goto err;
 437         }
 438         pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
 439         X509_free(cert);
 440         cert = NULL;
 441
 442         rsa->n = BN_dup(pub_rsa->n);
 443         rsa->e = BN_dup(pub_rsa->e);
 444         if (!RSA_set_method(rsa, rsa_meth))
 445                 goto err;
 446
 447         if (!SSL_use_RSAPrivateKey(ssl, rsa))
 448                 goto err;
 449         RSA_free(rsa);
 450
 451         return 0;
 452
 453 err:
 454         if (cert)
 455                 X509_free(cert);
 456         if (rsa)
 457                 RSA_free(rsa);
 458         else {
 459                 os_free(rsa_meth);
 460                 cryptoapi_free_data(priv);
 461         }
 462         return -1;
 463 }
 464
 465
 466 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
 467 {
 468         HCERTSTORE cs;
 469         PCCERT_CONTEXT ctx = NULL;
 470         X509 *cert;
 471         char buf[128];
 472         const char *store;
 473 #ifdef UNICODE
 474         WCHAR *wstore;
 475 #endif /* UNICODE */
 476
 477         if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
 478                 return -1;
 479
 480         store = name + 13;
 481 #ifdef UNICODE
 482         wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
 483         if (wstore == NULL)
 484                 return -1;
 485         wsprintf(wstore, L"%S", store);
 486         cs = CertOpenSystemStore(0, wstore);
 487         os_free(wstore);
 488 #else /* UNICODE */
 489         cs = CertOpenSystemStore(0, store);
 490 #endif /* UNICODE */
 491         if (cs == NULL) {
 492                 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
 493                            "'%s': error=%d", __func__, store,
 494                            (int) GetLastError());
 495                 return -1;
 496         }
 497
 498         while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
 499                 cert = d2i_X509(NULL,
 500                                 (const unsigned char **) &ctx->pbCertEncoded,
 501                                 ctx->cbCertEncoded);
 502                 if (cert == NULL) {
 503                         wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
 504                                    "X509 DER encoding for CA cert");
 505                         continue;
 506                 }
 507
 508                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
 509                                   sizeof(buf));
 510                 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
 511                            "system certificate store: subject='%s'", buf);
 512
 513                 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
 514                         tls_show_errors(MSG_WARNING, __func__,
 515                                         "Failed to add ca_cert to OpenSSL "
 516                                         "certificate store");
 517                 }
 518
 519                 X509_free(cert);
 520         }
 521
 522         if (!CertCloseStore(cs, 0)) {
 523                 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
 524                            "'%s': error=%d", __func__, name + 13,
 525                            (int) GetLastError());
 526         }
 527
 528         return 0;
 529 }
 530
 531
 532 #else /* CONFIG_NATIVE_WINDOWS */
 533
 534 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 535 {
 536         return -1;
 537 }
 538
 539 #endif /* CONFIG_NATIVE_WINDOWS */
 540
 541
 542 static void ssl_info_cb(const SSL *ssl, int where, int ret)
 543 {
 544         const char *str;
 545         int w;
 546
 547         wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
 548         w = where & ~SSL_ST_MASK;
 549         if (w & SSL_ST_CONNECT)
 550                 str = "SSL_connect";
 551         else if (w & SSL_ST_ACCEPT)
 552                 str = "SSL_accept";
 553         else
 554                 str = "undefined";
 555
 556         if (where & SSL_CB_LOOP) {
 557                 wpa_printf(MSG_DEBUG, "SSL: %s:%s",
 558                            str, SSL_state_string_long(ssl));
 559         } else if (where & SSL_CB_ALERT) {
 560                 struct tls_connection *conn = SSL_get_app_data((SSL *) ssl);
 561                 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
 562                            where & SSL_CB_READ ?
 563                            "read (remote end reported an error)" :
 564                            "write (local SSL3 detected an error)",
 565                            SSL_alert_type_string_long(ret),
 566                            SSL_alert_desc_string_long(ret));
 567                 if ((ret >> 8) == SSL3_AL_FATAL) {
 568                         if (where & SSL_CB_READ)
 569                                 conn->read_alerts++;
 570                         else
 571                                 conn->write_alerts++;
 572                 }
 573                 if (conn->context->event_cb != NULL) {
 574                         union tls_event_data ev;
 575                         struct tls_context *context = conn->context;
 576                         os_memset(&ev, 0, sizeof(ev));
 577                         ev.alert.is_local = !(where & SSL_CB_READ);
 578                         ev.alert.type = SSL_alert_type_string_long(ret);
 579                         ev.alert.description = SSL_alert_desc_string_long(ret);
 580                         context->event_cb(context->cb_ctx, TLS_ALERT, &ev);
 581                 }
 582         } else if (where & SSL_CB_EXIT && ret <= 0) {
 583                 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
 584                            str, ret == 0 ? "failed" : "error",
 585                            SSL_state_string_long(ssl));
 586         }
 587 }
 588
 589
 590 #ifndef OPENSSL_NO_ENGINE
 591 /**
 592  * tls_engine_load_dynamic_generic - load any openssl engine
 593  * @pre: an array of commands and values that load an engine initialized
 594  *       in the engine specific function
 595  * @post: an array of commands and values that initialize an already loaded
 596  *        engine (or %NULL if not required)
 597  * @id: the engine id of the engine to load (only required if post is not %NULL
 598  *
 599  * This function is a generic function that loads any openssl engine.
 600  *
 601  * Returns: 0 on success, -1 on failure
 602  */
 603 static int tls_engine_load_dynamic_generic(const char *pre[],
 604                                            const char *post[], const char *id)
 605 {
 606         ENGINE *engine;
 607         const char *dynamic_id = "dynamic";
 608
 609         engine = ENGINE_by_id(id);
 610         if (engine) {
 611                 ENGINE_free(engine);
 612                 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
 613                            "available", id);
 614                 return 0;
 615         }
 616         ERR_clear_error();
 617
 618         engine = ENGINE_by_id(dynamic_id);
 619         if (engine == NULL) {
 620                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 621                            dynamic_id,
 622                            ERR_error_string(ERR_get_error(), NULL));
 623                 return -1;
 624         }
 625
 626         /* Perform the pre commands. This will load the engine. */
 627         while (pre && pre[0]) {
 628                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
 629                 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
 630                         wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
 631                                    "%s %s [%s]", pre[0], pre[1],
 632                                    ERR_error_string(ERR_get_error(), NULL));
 633                         ENGINE_free(engine);
 634                         return -1;
 635                 }
 636                 pre += 2;
 637         }
 638
 639         /*
 640          * Free the reference to the "dynamic" engine. The loaded engine can
 641          * now be looked up using ENGINE_by_id().
 642          */
 643         ENGINE_free(engine);
 644
 645         engine = ENGINE_by_id(id);
 646         if (engine == NULL) {
 647                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 648                            id, ERR_error_string(ERR_get_error(), NULL));
 649                 return -1;
 650         }
 651
 652         while (post && post[0]) {
 653                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
 654                 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
 655                         wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
 656                                 " %s %s [%s]", post[0], post[1],
 657                                    ERR_error_string(ERR_get_error(), NULL));
 658                         ENGINE_remove(engine);
 659                         ENGINE_free(engine);
 660                         return -1;
 661                 }
 662                 post += 2;
 663         }
 664         ENGINE_free(engine);
 665
 666         return 0;
 667 }
 668
 669
 670 /**
 671  * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
 672  * @pkcs11_so_path: pksc11_so_path from the configuration
 673  * @pcks11_module_path: pkcs11_module_path from the configuration
 674  */
 675 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
 676                                           const char *pkcs11_module_path)
 677 {
 678         char *engine_id = "pkcs11";
 679         const char *pre_cmd[] = {
 680                 "SO_PATH", NULL /* pkcs11_so_path */,
 681                 "ID", NULL /* engine_id */,
 682                 "LIST_ADD", "1",
 683                 /* "NO_VCHECK", "1", */
 684                 "LOAD", NULL,
 685                 NULL, NULL
 686         };
 687         const char *post_cmd[] = {
 688                 "MODULE_PATH", NULL /* pkcs11_module_path */,
 689                 NULL, NULL
 690         };
 691
 692         if (!pkcs11_so_path)
 693                 return 0;
 694
 695         pre_cmd[1] = pkcs11_so_path;
 696         pre_cmd[3] = engine_id;
 697         if (pkcs11_module_path)
 698                 post_cmd[1] = pkcs11_module_path;
 699         else
 700                 post_cmd[0] = NULL;
 701
 702         wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
 703                    pkcs11_so_path);
 704
 705         return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
 706 }
 707
 708
 709 /**
 710  * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
 711  * @opensc_so_path: opensc_so_path from the configuration
 712  */
 713 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
 714 {
 715         char *engine_id = "opensc";
 716         const char *pre_cmd[] = {
 717                 "SO_PATH", NULL /* opensc_so_path */,
 718                 "ID", NULL /* engine_id */,
 719                 "LIST_ADD", "1",
 720                 "LOAD", NULL,
 721                 NULL, NULL
 722         };
 723
 724         if (!opensc_so_path)
 725                 return 0;
 726
 727         pre_cmd[1] = opensc_so_path;
 728         pre_cmd[3] = engine_id;
 729
 730         wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
 731                    opensc_so_path);
 732
 733         return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
 734 }
 735 #endif /* OPENSSL_NO_ENGINE */
 736
 737
 738 void * tls_init(const struct tls_config *conf)
 739 {
 740         SSL_CTX *ssl;
 741         struct tls_context *context;
 742         const char *ciphers;
 743
 744         if (tls_openssl_ref_count == 0) {
 745                 tls_global = context = tls_context_new(conf);
 746                 if (context == NULL)
 747                         return NULL;
 748 #ifdef CONFIG_FIPS
 749 #ifdef OPENSSL_FIPS
 750                 if (conf && conf->fips_mode) {
 751                         if (!FIPS_mode_set(1)) {
 752                                 wpa_printf(MSG_ERROR, "Failed to enable FIPS "
 753                                            "mode");
 754                                 ERR_load_crypto_strings();
 755                                 ERR_print_errors_fp(stderr);
 756                                 os_free(tls_global);
 757                                 tls_global = NULL;
 758                                 return NULL;
 759                         } else
 760                                 wpa_printf(MSG_INFO, "Running in FIPS mode");
 761                 }
 762 #else /* OPENSSL_FIPS */
 763                 if (conf && conf->fips_mode) {
 764                         wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
 765                                    "supported");
 766                         os_free(tls_global);
 767                         tls_global = NULL;
 768                         return NULL;
 769                 }
 770 #endif /* OPENSSL_FIPS */
 771 #endif /* CONFIG_FIPS */
 772                 SSL_load_error_strings();
 773                 SSL_library_init();
 774 #ifndef OPENSSL_NO_SHA256
 775                 EVP_add_digest(EVP_sha256());
 776 #endif /* OPENSSL_NO_SHA256 */
 777                 /* TODO: if /dev/urandom is available, PRNG is seeded
 778                  * automatically. If this is not the case, random data should
 779                  * be added here. */
 780
 781 #ifdef PKCS12_FUNCS
 782 #ifndef OPENSSL_NO_RC2
 783                 /*
 784                  * 40-bit RC2 is commonly used in PKCS#12 files, so enable it.
 785                  * This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8
 786                  * versions, but it looks like OpenSSL 1.0.0 does not do that
 787                  * anymore.
 788                  */
 789                 EVP_add_cipher(EVP_rc2_40_cbc());
 790 #endif /* OPENSSL_NO_RC2 */
 791                 PKCS12_PBE_add();
 792 #endif  /* PKCS12_FUNCS */
 793         } else {
 794 #ifdef OPENSSL_SUPPORTS_CTX_APP_DATA
 795                 /* Newer OpenSSL can store app-data per-SSL */
 796                 context = tls_context_new(conf);
 797                 if (context == NULL)
 798                         return NULL;
 799 #else /* OPENSSL_SUPPORTS_CTX_APP_DATA */
 800                 context = tls_global;
 801 #endif /* OPENSSL_SUPPORTS_CTX_APP_DATA */
 802         }
 803         tls_openssl_ref_count++;
 804
 805         ssl = SSL_CTX_new(SSLv23_method());
 806         if (ssl == NULL) {
 807                 tls_openssl_ref_count--;
 808 #ifdef OPENSSL_SUPPORTS_CTX_APP_DATA
 809                 if (context != tls_global)
 810                         os_free(context);
 811 #endif /* OPENSSL_SUPPORTS_CTX_APP_DATA */
 812                 if (tls_openssl_ref_count == 0) {
 813                         os_free(tls_global);
 814                         tls_global = NULL;
 815                 }
 816                 return NULL;
 817         }
 818
 819         SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv2);
 820         SSL_CTX_set_options(ssl, SSL_OP_NO_SSLv3);
 821
 822         SSL_CTX_set_info_callback(ssl, ssl_info_cb);
 823 #ifdef OPENSSL_SUPPORTS_CTX_APP_DATA
 824         SSL_CTX_set_app_data(ssl, context);
 825 #endif /* OPENSSL_SUPPORTS_CTX_APP_DATA */
 826
 827 #ifndef OPENSSL_NO_ENGINE
 828         wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
 829         ERR_load_ENGINE_strings();
 830         ENGINE_load_dynamic();
 831
 832         if (conf &&
 833             (conf->opensc_engine_path || conf->pkcs11_engine_path ||
 834              conf->pkcs11_module_path)) {
 835                 if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
 836                     tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
 837                                                    conf->pkcs11_module_path)) {
 838                         tls_deinit(ssl);
 839                         return NULL;
 840                 }
 841         }
 842 #endif /* OPENSSL_NO_ENGINE */
 843
 844         if (conf && conf->openssl_ciphers)
 845                 ciphers = conf->openssl_ciphers;
 846         else
 847                 ciphers = "DEFAULT:!EXP:!LOW";
 848         if (SSL_CTX_set_cipher_list(ssl, ciphers) != 1) {
 849                 wpa_printf(MSG_ERROR,
 850                            "OpenSSL: Failed to set cipher string '%s'",
 851                            ciphers);
 852                 tls_deinit(ssl);
 853                 return NULL;
 854         }
 855
 856         return ssl;
 857 }
 858
 859
 860 void tls_deinit(void *ssl_ctx)
 861 {
 862         SSL_CTX *ssl = ssl_ctx;
 863 #ifdef OPENSSL_SUPPORTS_CTX_APP_DATA
 864         struct tls_context *context = SSL_CTX_get_app_data(ssl);
 865         if (context != tls_global)
 866                 os_free(context);
 867 #endif /* OPENSSL_SUPPORTS_CTX_APP_DATA */
 868         SSL_CTX_free(ssl);
 869
 870         tls_openssl_ref_count--;
 871         if (tls_openssl_ref_count == 0) {
 872 #ifndef OPENSSL_NO_ENGINE
 873                 ENGINE_cleanup();
 874 #endif /* OPENSSL_NO_ENGINE */
 875                 CRYPTO_cleanup_all_ex_data();
 876                 ERR_remove_thread_state(NULL);
 877                 ERR_free_strings();
 878                 EVP_cleanup();
 879                 os_free(tls_global->ocsp_stapling_response);
 880                 tls_global->ocsp_stapling_response = NULL;
 881                 os_free(tls_global);
 882                 tls_global = NULL;
 883         }
 884 }
 885
 886
 887 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
 888                            const char *pin, const char *key_id,
 889                            const char *cert_id, const char *ca_cert_id)
 890 {
 891 #ifndef OPENSSL_NO_ENGINE
 892         int ret = -1;
 893         if (engine_id == NULL) {
 894                 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
 895                 return -1;
 896         }
 897
 898         ERR_clear_error();
 899 #ifdef ANDROID
 900         ENGINE_load_dynamic();
 901 #endif
 902         conn->engine = ENGINE_by_id(engine_id);
 903         if (!conn->engine) {
 904                 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
 905                            engine_id, ERR_error_string(ERR_get_error(), NULL));
 906                 goto err;
 907         }
 908         if (ENGINE_init(conn->engine) != 1) {
 909                 wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
 910                            "(engine: %s) [%s]", engine_id,
 911                            ERR_error_string(ERR_get_error(), NULL));
 912                 goto err;
 913         }
 914         wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
 915
 916 #ifndef ANDROID
 917         if (pin && ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
 918                 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
 919                            ERR_error_string(ERR_get_error(), NULL));
 920                 goto err;
 921         }
 922 #endif
 923         if (key_id) {
 924                 /*
 925                  * Ensure that the ENGINE does not attempt to use the OpenSSL
 926                  * UI system to obtain a PIN, if we didn't provide one.
 927                  */
 928                 struct {
 929                         const void *password;
 930                         const char *prompt_info;
 931                 } key_cb = { "", NULL };
 932
 933                 /* load private key first in-case PIN is required for cert */
 934                 conn->private_key = ENGINE_load_private_key(conn->engine,
 935                                                             key_id, NULL,
 936                                                             &key_cb);
 937                 if (!conn->private_key) {
 938                         wpa_printf(MSG_ERROR,
 939                                    "ENGINE: cannot load private key with id '%s' [%s]",
 940                                    key_id,
 941                                    ERR_error_string(ERR_get_error(), NULL));
 942                         ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
 943                         goto err;
 944                 }
 945         }
 946
 947         /* handle a certificate and/or CA certificate */
 948         if (cert_id || ca_cert_id) {
 949                 const char *cmd_name = "LOAD_CERT_CTRL";
 950
 951                 /* test if the engine supports a LOAD_CERT_CTRL */
 952                 if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
 953                                  0, (void *)cmd_name, NULL)) {
 954                         wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
 955                                    " loading certificates");
 956                         ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
 957                         goto err;
 958                 }
 959         }
 960
 961         return 0;
 962
 963 err:
 964         if (conn->engine) {
 965                 ENGINE_free(conn->engine);
 966                 conn->engine = NULL;
 967         }
 968
 969         if (conn->private_key) {
 970                 EVP_PKEY_free(conn->private_key);
 971                 conn->private_key = NULL;
 972         }
 973
 974         return ret;
 975 #else /* OPENSSL_NO_ENGINE */
 976         return 0;
 977 #endif /* OPENSSL_NO_ENGINE */
 978 }
 979
 980
 981 static void tls_engine_deinit(struct tls_connection *conn)
 982 {
 983 #ifndef OPENSSL_NO_ENGINE
 984         wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
 985         if (conn->private_key) {
 986                 EVP_PKEY_free(conn->private_key);
 987                 conn->private_key = NULL;
 988         }
 989         if (conn->engine) {
 990                 ENGINE_finish(conn->engine);
 991                 conn->engine = NULL;
 992         }
 993 #endif /* OPENSSL_NO_ENGINE */
 994 }
 995
 996
 997 int tls_get_errors(void *ssl_ctx)
 998 {
 999         int count = 0;
1000         unsigned long err;
1001
1002         while ((err = ERR_get_error())) {
1003                 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
1004                            ERR_error_string(err, NULL));
1005                 count++;
1006         }
1007
1008         return count;
1009 }
1010
1011
1012 static void tls_msg_cb(int write_p, int version, int content_type,
1013                        const void *buf, size_t len, SSL *ssl, void *arg)
1014 {
1015         struct tls_connection *conn = arg;
1016         const u8 *pos = buf;
1017
1018         wpa_printf(MSG_DEBUG, "OpenSSL: %s ver=0x%x content_type=%d",
1019                    write_p ? "TX" : "RX", version, content_type);
1020         wpa_hexdump_key(MSG_MSGDUMP, "OpenSSL: Message", buf, len);
1021         if (content_type == 24 && len >= 3 && pos[0] == 1) {
1022                 size_t payload_len = WPA_GET_BE16(pos + 1);
1023                 if (payload_len + 3 > len) {
1024                         wpa_printf(MSG_ERROR, "OpenSSL: Heartbeat attack detected");
1025                         conn->invalid_hb_used = 1;
1026                 }
1027         }
1028 }
1029
1030
1031 struct tls_connection * tls_connection_init(void *ssl_ctx)
1032 {
1033         SSL_CTX *ssl = ssl_ctx;
1034         struct tls_connection *conn;
1035         long options;
1036 #ifdef OPENSSL_SUPPORTS_CTX_APP_DATA
1037         struct tls_context *context = SSL_CTX_get_app_data(ssl);
1038 #else /* OPENSSL_SUPPORTS_CTX_APP_DATA */
1039         struct tls_context *context = tls_global;
1040 #endif /* OPENSSL_SUPPORTS_CTX_APP_DATA */
1041
1042         conn = os_zalloc(sizeof(*conn));
1043         if (conn == NULL)
1044                 return NULL;
1045         conn->ssl_ctx = ssl_ctx;
1046         conn->ssl = SSL_new(ssl);
1047         if (conn->ssl == NULL) {
1048                 tls_show_errors(MSG_INFO, __func__,
1049                                 "Failed to initialize new SSL connection");
1050                 os_free(conn);
1051                 return NULL;
1052         }
1053
1054         conn->context = context;
1055         SSL_set_app_data(conn->ssl, conn);
1056         SSL_set_msg_callback(conn->ssl, tls_msg_cb);
1057         SSL_set_msg_callback_arg(conn->ssl, conn);
1058         options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
1059                 SSL_OP_SINGLE_DH_USE;
1060 #ifdef SSL_OP_NO_COMPRESSION
1061         options |= SSL_OP_NO_COMPRESSION;
1062 #endif /* SSL_OP_NO_COMPRESSION */
1063         SSL_set_options(conn->ssl, options);
1064
1065         conn->ssl_in = BIO_new(BIO_s_mem());
1066         if (!conn->ssl_in) {
1067                 tls_show_errors(MSG_INFO, __func__,
1068                                 "Failed to create a new BIO for ssl_in");
1069                 SSL_free(conn->ssl);
1070                 os_free(conn);
1071                 return NULL;
1072         }
1073
1074         conn->ssl_out = BIO_new(BIO_s_mem());
1075         if (!conn->ssl_out) {
1076                 tls_show_errors(MSG_INFO, __func__,
1077                                 "Failed to create a new BIO for ssl_out");
1078                 SSL_free(conn->ssl);
1079                 BIO_free(conn->ssl_in);
1080                 os_free(conn);
1081                 return NULL;
1082         }
1083
1084         SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
1085
1086         return conn;
1087 }
1088
1089
1090 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
1091 {
1092         if (conn == NULL)
1093                 return;
1094         SSL_free(conn->ssl);
1095         tls_engine_deinit(conn);
1096         os_free(conn->subject_match);
1097         os_free(conn->altsubject_match);
1098         os_free(conn->suffix_match);
1099         os_free(conn->domain_match);
1100         os_free(conn->session_ticket);
1101         os_free(conn);
1102 }
1103
1104
1105 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
1106 {
1107         return conn ? SSL_is_init_finished(conn->ssl) : 0;
1108 }
1109
1110
1111 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
1112 {
1113         if (conn == NULL)
1114                 return -1;
1115
1116         /* Shutdown previous TLS connection without notifying the peer
1117          * because the connection was already terminated in practice
1118          * and "close notify" shutdown alert would confuse AS. */
1119         SSL_set_quiet_shutdown(conn->ssl, 1);
1120         SSL_shutdown(conn->ssl);
1121         return 0;
1122 }
1123
1124
1125 static int tls_match_altsubject_component(X509 *cert, int type,
1126                                           const char *value, size_t len)
1127 {
1128         GENERAL_NAME *gen;
1129         void *ext;
1130         int found = 0;
1131         stack_index_t i;
1132
1133         ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1134
1135         for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1136                 gen = sk_GENERAL_NAME_value(ext, i);
1137                 if (gen->type != type)
1138                         continue;
1139                 if (os_strlen((char *) gen->d.ia5->data) == len &&
1140                     os_memcmp(value, gen->d.ia5->data, len) == 0)
1141                         found++;
1142         }
1143
1144         return found;
1145 }
1146
1147
1148 static int tls_match_altsubject(X509 *cert, const char *match)
1149 {
1150         int type;
1151         const char *pos, *end;
1152         size_t len;
1153
1154         pos = match;
1155         do {
1156                 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
1157                         type = GEN_EMAIL;
1158                         pos += 6;
1159                 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
1160                         type = GEN_DNS;
1161                         pos += 4;
1162                 } else if (os_strncmp(pos, "URI:", 4) == 0) {
1163                         type = GEN_URI;
1164                         pos += 4;
1165                 } else {
1166                         wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1167                                    "match '%s'", pos);
1168                         return 0;
1169                 }
1170                 end = os_strchr(pos, ';');
1171                 while (end) {
1172                         if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1173                             os_strncmp(end + 1, "DNS:", 4) == 0 ||
1174                             os_strncmp(end + 1, "URI:", 4) == 0)
1175                                 break;
1176                         end = os_strchr(end + 1, ';');
1177                 }
1178                 if (end)
1179                         len = end - pos;
1180                 else
1181                         len = os_strlen(pos);
1182                 if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1183                         return 1;
1184                 pos = end + 1;
1185         } while (end);
1186
1187         return 0;
1188 }
1189
1190
1191 #ifndef CONFIG_NATIVE_WINDOWS
1192 static int domain_suffix_match(const u8 *val, size_t len, const char *match,
1193                                int full)
1194 {
1195         size_t i, match_len;
1196
1197         /* Check for embedded nuls that could mess up suffix matching */
1198         for (i = 0; i < len; i++) {
1199                 if (val[i] == '\0') {
1200                         wpa_printf(MSG_DEBUG, "TLS: Embedded null in a string - reject");
1201                         return 0;
1202                 }
1203         }
1204
1205         match_len = os_strlen(match);
1206         if (match_len > len || (full && match_len != len))
1207                 return 0;
1208
1209         if (os_strncasecmp((const char *) val + len - match_len, match,
1210                            match_len) != 0)
1211                 return 0; /* no match */
1212
1213         if (match_len == len)
1214                 return 1; /* exact match */
1215
1216         if (val[len - match_len - 1] == '.')
1217                 return 1; /* full label match completes suffix match */
1218
1219         wpa_printf(MSG_DEBUG, "TLS: Reject due to incomplete label match");
1220         return 0;
1221 }
1222 #endif /* CONFIG_NATIVE_WINDOWS */
1223
1224
1225 static int tls_match_suffix(X509 *cert, const char *match, int full)
1226 {
1227 #ifdef CONFIG_NATIVE_WINDOWS
1228         /* wincrypt.h has conflicting X509_NAME definition */
1229         return -1;
1230 #else /* CONFIG_NATIVE_WINDOWS */
1231         GENERAL_NAME *gen;
1232         void *ext;
1233         int i;
1234         stack_index_t j;
1235         int dns_name = 0;
1236         X509_NAME *name;
1237
1238         wpa_printf(MSG_DEBUG, "TLS: Match domain against %s%s",
1239                    full ? "": "suffix ", match);
1240
1241         ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1242
1243         for (j = 0; ext && j < sk_GENERAL_NAME_num(ext); j++) {
1244                 gen = sk_GENERAL_NAME_value(ext, j);
1245                 if (gen->type != GEN_DNS)
1246                         continue;
1247                 dns_name++;
1248                 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate dNSName",
1249                                   gen->d.dNSName->data,
1250                                   gen->d.dNSName->length);
1251                 if (domain_suffix_match(gen->d.dNSName->data,
1252                                         gen->d.dNSName->length, match, full) ==
1253                     1) {
1254                         wpa_printf(MSG_DEBUG, "TLS: %s in dNSName found",
1255                                    full ? "Match" : "Suffix match");
1256                         return 1;
1257                 }
1258         }
1259
1260         if (dns_name) {
1261                 wpa_printf(MSG_DEBUG, "TLS: None of the dNSName(s) matched");
1262                 return 0;
1263         }
1264
1265         name = X509_get_subject_name(cert);
1266         i = -1;
1267         for (;;) {
1268                 X509_NAME_ENTRY *e;
1269                 ASN1_STRING *cn;
1270
1271                 i = X509_NAME_get_index_by_NID(name, NID_commonName, i);
1272                 if (i == -1)
1273                         break;
1274                 e = X509_NAME_get_entry(name, i);
1275                 if (e == NULL)
1276                         continue;
1277                 cn = X509_NAME_ENTRY_get_data(e);
1278                 if (cn == NULL)
1279                         continue;
1280                 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate commonName",
1281                                   cn->data, cn->length);
1282                 if (domain_suffix_match(cn->data, cn->length, match, full) == 1)
1283                 {
1284                         wpa_printf(MSG_DEBUG, "TLS: %s in commonName found",
1285                                    full ? "Match" : "Suffix match");
1286                         return 1;
1287                 }
1288         }
1289
1290         wpa_printf(MSG_DEBUG, "TLS: No CommonName %smatch found",
1291                    full ? "": "suffix ");
1292         return 0;
1293 #endif /* CONFIG_NATIVE_WINDOWS */
1294 }
1295
1296
1297 static enum tls_fail_reason openssl_tls_fail_reason(int err)
1298 {
1299         switch (err) {
1300         case X509_V_ERR_CERT_REVOKED:
1301                 return TLS_FAIL_REVOKED;
1302         case X509_V_ERR_CERT_NOT_YET_VALID:
1303         case X509_V_ERR_CRL_NOT_YET_VALID:
1304                 return TLS_FAIL_NOT_YET_VALID;
1305         case X509_V_ERR_CERT_HAS_EXPIRED:
1306         case X509_V_ERR_CRL_HAS_EXPIRED:
1307                 return TLS_FAIL_EXPIRED;
1308         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1309         case X509_V_ERR_UNABLE_TO_GET_CRL:
1310         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
1311         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
1312         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
1313         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
1314         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
1315         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
1316         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
1317         case X509_V_ERR_INVALID_CA:
1318                 return TLS_FAIL_UNTRUSTED;
1319         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
1320         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
1321         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
1322         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1323         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1324         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
1325         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
1326         case X509_V_ERR_CERT_UNTRUSTED:
1327         case X509_V_ERR_CERT_REJECTED:
1328                 return TLS_FAIL_BAD_CERTIFICATE;
1329         default:
1330                 return TLS_FAIL_UNSPECIFIED;
1331         }
1332 }
1333
1334
1335 static struct wpabuf * get_x509_cert(X509 *cert)
1336 {
1337         struct wpabuf *buf;
1338         u8 *tmp;
1339
1340         int cert_len = i2d_X509(cert, NULL);
1341         if (cert_len <= 0)
1342                 return NULL;
1343
1344         buf = wpabuf_alloc(cert_len);
1345         if (buf == NULL)
1346                 return NULL;
1347
1348         tmp = wpabuf_put(buf, cert_len);
1349         i2d_X509(cert, &tmp);
1350         return buf;
1351 }
1352
1353
1354 static void openssl_tls_fail_event(struct tls_connection *conn,
1355                                    X509 *err_cert, int err, int depth,
1356                                    const char *subject, const char *err_str,
1357                                    enum tls_fail_reason reason)
1358 {
1359         union tls_event_data ev;
1360         struct wpabuf *cert = NULL;
1361         struct tls_context *context = conn->context;
1362
1363         if (context->event_cb == NULL)
1364                 return;
1365
1366         cert = get_x509_cert(err_cert);
1367         os_memset(&ev, 0, sizeof(ev));
1368         ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
1369                 reason : openssl_tls_fail_reason(err);
1370         ev.cert_fail.depth = depth;
1371         ev.cert_fail.subject = subject;
1372         ev.cert_fail.reason_txt = err_str;
1373         ev.cert_fail.cert = cert;
1374         context->event_cb(context->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
1375         wpabuf_free(cert);
1376 }
1377
1378
1379 static void openssl_tls_cert_event(struct tls_connection *conn,
1380                                    X509 *err_cert, int depth,
1381                                    const char *subject)
1382 {
1383         struct wpabuf *cert = NULL;
1384         union tls_event_data ev;
1385         struct tls_context *context = conn->context;
1386         char *altsubject[TLS_MAX_ALT_SUBJECT];
1387         int alt, num_altsubject = 0;
1388         GENERAL_NAME *gen;
1389         void *ext;
1390         stack_index_t i;
1391 #ifdef CONFIG_SHA256
1392         u8 hash[32];
1393 #endif /* CONFIG_SHA256 */
1394
1395         if (context->event_cb == NULL)
1396                 return;
1397
1398         os_memset(&ev, 0, sizeof(ev));
1399         if (conn->cert_probe || context->cert_in_cb) {
1400                 cert = get_x509_cert(err_cert);
1401                 ev.peer_cert.cert = cert;
1402         }
1403 #ifdef CONFIG_SHA256
1404         if (cert) {
1405                 const u8 *addr[1];
1406                 size_t len[1];
1407                 addr[0] = wpabuf_head(cert);
1408                 len[0] = wpabuf_len(cert);
1409                 if (sha256_vector(1, addr, len, hash) == 0) {
1410                         ev.peer_cert.hash = hash;
1411                         ev.peer_cert.hash_len = sizeof(hash);
1412                 }
1413         }
1414 #endif /* CONFIG_SHA256 */
1415         ev.peer_cert.depth = depth;
1416         ev.peer_cert.subject = subject;
1417
1418         ext = X509_get_ext_d2i(err_cert, NID_subject_alt_name, NULL, NULL);
1419         for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1420                 char *pos;
1421
1422                 if (num_altsubject == TLS_MAX_ALT_SUBJECT)
1423                         break;
1424                 gen = sk_GENERAL_NAME_value(ext, i);
1425                 if (gen->type != GEN_EMAIL &&
1426                     gen->type != GEN_DNS &&
1427                     gen->type != GEN_URI)
1428                         continue;
1429
1430                 pos = os_malloc(10 + gen->d.ia5->length + 1);
1431                 if (pos == NULL)
1432                         break;
1433                 altsubject[num_altsubject++] = pos;
1434
1435                 switch (gen->type) {
1436                 case GEN_EMAIL:
1437                         os_memcpy(pos, "EMAIL:", 6);
1438                         pos += 6;
1439                         break;
1440                 case GEN_DNS:
1441                         os_memcpy(pos, "DNS:", 4);
1442                         pos += 4;
1443                         break;
1444                 case GEN_URI:
1445                         os_memcpy(pos, "URI:", 4);
1446                         pos += 4;
1447                         break;
1448                 }
1449
1450                 os_memcpy(pos, gen->d.ia5->data, gen->d.ia5->length);
1451                 pos += gen->d.ia5->length;
1452                 *pos = '\0';
1453         }
1454
1455         for (alt = 0; alt < num_altsubject; alt++)
1456                 ev.peer_cert.altsubject[alt] = altsubject[alt];
1457         ev.peer_cert.num_altsubject = num_altsubject;
1458
1459         context->event_cb(context->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
1460         wpabuf_free(cert);
1461         for (alt = 0; alt < num_altsubject; alt++)
1462                 os_free(altsubject[alt]);
1463 }
1464
1465
1466 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
1467 {
1468         char buf[256];
1469         X509 *err_cert;
1470         int err, depth;
1471         SSL *ssl;
1472         struct tls_connection *conn;
1473         struct tls_context *context;
1474         char *match, *altmatch, *suffix_match, *domain_match;
1475         const char *err_str;
1476
1477         err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
1478         if (!err_cert)
1479                 return 0;
1480
1481         err = X509_STORE_CTX_get_error(x509_ctx);
1482         depth = X509_STORE_CTX_get_error_depth(x509_ctx);
1483         ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
1484                                          SSL_get_ex_data_X509_STORE_CTX_idx());
1485         X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
1486
1487         conn = SSL_get_app_data(ssl);
1488         if (conn == NULL)
1489                 return 0;
1490
1491         if (depth == 0)
1492                 conn->peer_cert = err_cert;
1493         else if (depth == 1)
1494                 conn->peer_issuer = err_cert;
1495         else if (depth == 2)
1496                 conn->peer_issuer_issuer = err_cert;
1497
1498         context = conn->context;
1499         match = conn->subject_match;
1500         altmatch = conn->altsubject_match;
1501         suffix_match = conn->suffix_match;
1502         domain_match = conn->domain_match;
1503
1504         if (!preverify_ok && !conn->ca_cert_verify)
1505                 preverify_ok = 1;
1506         if (!preverify_ok && depth > 0 && conn->server_cert_only)
1507                 preverify_ok = 1;
1508         if (!preverify_ok && (conn->flags & TLS_CONN_DISABLE_TIME_CHECKS) &&
1509             (err == X509_V_ERR_CERT_HAS_EXPIRED ||
1510              err == X509_V_ERR_CERT_NOT_YET_VALID)) {
1511                 wpa_printf(MSG_DEBUG, "OpenSSL: Ignore certificate validity "
1512                            "time mismatch");
1513                 preverify_ok = 1;
1514         }
1515
1516         err_str = X509_verify_cert_error_string(err);
1517
1518 #ifdef CONFIG_SHA256
1519         /*
1520          * Do not require preverify_ok so we can explicity allow otherwise
1521          * invalid pinned server certificates.
1522          */
1523         if (depth == 0 && conn->server_cert_only) {
1524                 struct wpabuf *cert;
1525                 cert = get_x509_cert(err_cert);
1526                 if (!cert) {
1527                         wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch "
1528                                    "server certificate data");
1529                         preverify_ok = 0;
1530                 } else {
1531                         u8 hash[32];
1532                         const u8 *addr[1];
1533                         size_t len[1];
1534                         addr[0] = wpabuf_head(cert);
1535                         len[0] = wpabuf_len(cert);
1536                         if (sha256_vector(1, addr, len, hash) < 0 ||
1537                             os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
1538                                 err_str = "Server certificate mismatch";
1539                                 err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
1540                                 preverify_ok = 0;
1541                         } else if (!preverify_ok) {
1542                                 /*
1543                                  * Certificate matches pinned certificate, allow
1544                                  * regardless of other problems.
1545                                  */
1546                                 wpa_printf(MSG_DEBUG,
1547                                            "OpenSSL: Ignore validation issues for a pinned server certificate");
1548                                 preverify_ok = 1;
1549                         }
1550                         wpabuf_free(cert);
1551                 }
1552         }
1553 #endif /* CONFIG_SHA256 */
1554
1555         if (!preverify_ok) {
1556                 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
1557                            " error %d (%s) depth %d for '%s'", err, err_str,
1558                            depth, buf);
1559                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1560                                        err_str, TLS_FAIL_UNSPECIFIED);
1561                 return preverify_ok;
1562         }
1563
1564         wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d "
1565                    "err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
1566                    preverify_ok, err, err_str,
1567                    conn->ca_cert_verify, depth, buf);
1568         if (depth == 0 && match && os_strstr(buf, match) == NULL) {
1569                 wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
1570                            "match with '%s'", buf, match);
1571                 preverify_ok = 0;
1572                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1573                                        "Subject mismatch",
1574                                        TLS_FAIL_SUBJECT_MISMATCH);
1575         } else if (depth == 0 && altmatch &&
1576                    !tls_match_altsubject(err_cert, altmatch)) {
1577                 wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
1578                            "'%s' not found", altmatch);
1579                 preverify_ok = 0;
1580                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1581                                        "AltSubject mismatch",
1582                                        TLS_FAIL_ALTSUBJECT_MISMATCH);
1583         } else if (depth == 0 && suffix_match &&
1584                    !tls_match_suffix(err_cert, suffix_match, 0)) {
1585                 wpa_printf(MSG_WARNING, "TLS: Domain suffix match '%s' not found",
1586                            suffix_match);
1587                 preverify_ok = 0;
1588                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1589                                        "Domain suffix mismatch",
1590                                        TLS_FAIL_DOMAIN_SUFFIX_MISMATCH);
1591         } else if (depth == 0 && domain_match &&
1592                    !tls_match_suffix(err_cert, domain_match, 1)) {
1593                 wpa_printf(MSG_WARNING, "TLS: Domain match '%s' not found",
1594                            domain_match);
1595                 preverify_ok = 0;
1596                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1597                                        "Domain mismatch",
1598                                        TLS_FAIL_DOMAIN_MISMATCH);
1599         } else
1600                 openssl_tls_cert_event(conn, err_cert, depth, buf);
1601
1602         if (conn->cert_probe && preverify_ok && depth == 0) {
1603                 wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate "
1604                            "on probe-only run");
1605                 preverify_ok = 0;
1606                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1607                                        "Server certificate chain probe",
1608                                        TLS_FAIL_SERVER_CHAIN_PROBE);
1609         }
1610
1611         if (preverify_ok && context->event_cb != NULL)
1612                 context->event_cb(context->cb_ctx,
1613                                   TLS_CERT_CHAIN_SUCCESS, NULL);
1614
1615         return preverify_ok;
1616 }
1617
1618
1619 #ifndef OPENSSL_NO_STDIO
1620 static int tls_load_ca_der(void *_ssl_ctx, const char *ca_cert)
1621 {
1622         SSL_CTX *ssl_ctx = _ssl_ctx;
1623         X509_LOOKUP *lookup;
1624         int ret = 0;
1625
1626         lookup = X509_STORE_add_lookup(SSL_CTX_get_cert_store(ssl_ctx),
1627                                        X509_LOOKUP_file());
1628         if (lookup == NULL) {
1629                 tls_show_errors(MSG_WARNING, __func__,
1630                                 "Failed add lookup for X509 store");
1631                 return -1;
1632         }
1633
1634         if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
1635                 unsigned long err = ERR_peek_error();
1636                 tls_show_errors(MSG_WARNING, __func__,
1637                                 "Failed load CA in DER format");
1638                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1639                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1640                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1641                                    "cert already in hash table error",
1642                                    __func__);
1643                 } else
1644                         ret = -1;
1645         }
1646
1647         return ret;
1648 }
1649 #endif /* OPENSSL_NO_STDIO */
1650
1651
1652 static int tls_connection_ca_cert(void *_ssl_ctx, struct tls_connection *conn,
1653                                   const char *ca_cert, const u8 *ca_cert_blob,
1654                                   size_t ca_cert_blob_len, const char *ca_path)
1655 {
1656         SSL_CTX *ssl_ctx = _ssl_ctx;
1657         X509_STORE *store;
1658
1659         /*
1660          * Remove previously configured trusted CA certificates before adding
1661          * new ones.
1662          */
1663         store = X509_STORE_new();
1664         if (store == NULL) {
1665                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1666                            "certificate store", __func__);
1667                 return -1;
1668         }
1669         SSL_CTX_set_cert_store(ssl_ctx, store);
1670
1671         SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1672         conn->ca_cert_verify = 1;
1673
1674         if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
1675                 wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate "
1676                            "chain");
1677                 conn->cert_probe = 1;
1678                 conn->ca_cert_verify = 0;
1679                 return 0;
1680         }
1681
1682         if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
1683 #ifdef CONFIG_SHA256
1684                 const char *pos = ca_cert + 7;
1685                 if (os_strncmp(pos, "server/sha256/", 14) != 0) {
1686                         wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert "
1687                                    "hash value '%s'", ca_cert);
1688                         return -1;
1689                 }
1690                 pos += 14;
1691                 if (os_strlen(pos) != 32 * 2) {
1692                         wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 "
1693                                    "hash length in ca_cert '%s'", ca_cert);
1694                         return -1;
1695                 }
1696                 if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
1697                         wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash "
1698                                    "value in ca_cert '%s'", ca_cert);
1699                         return -1;
1700                 }
1701                 conn->server_cert_only = 1;
1702                 wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server "
1703                            "certificate match");
1704                 return 0;
1705 #else /* CONFIG_SHA256 */
1706                 wpa_printf(MSG_INFO, "No SHA256 included in the build - "
1707                            "cannot validate server certificate hash");
1708                 return -1;
1709 #endif /* CONFIG_SHA256 */
1710         }
1711
1712         if (ca_cert_blob) {
1713                 X509 *cert = d2i_X509(NULL,
1714                                       (const unsigned char **) &ca_cert_blob,
1715                                       ca_cert_blob_len);
1716                 if (cert == NULL) {
1717                         tls_show_errors(MSG_WARNING, __func__,
1718                                         "Failed to parse ca_cert_blob");
1719                         return -1;
1720                 }
1721
1722                 if (!X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx),
1723                                          cert)) {
1724                         unsigned long err = ERR_peek_error();
1725                         tls_show_errors(MSG_WARNING, __func__,
1726                                         "Failed to add ca_cert_blob to "
1727                                         "certificate store");
1728                         if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1729                             ERR_GET_REASON(err) ==
1730                             X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1731                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1732                                            "cert already in hash table error",
1733                                            __func__);
1734                         } else {
1735                                 X509_free(cert);
1736                                 return -1;
1737                         }
1738                 }
1739                 X509_free(cert);
1740                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
1741                            "to certificate store", __func__);
1742                 return 0;
1743         }
1744
1745 #ifdef ANDROID
1746         if (ca_cert && os_strncmp("keystore://", ca_cert, 11) == 0) {
1747                 BIO *bio = BIO_from_keystore(&ca_cert[11]);
1748                 STACK_OF(X509_INFO) *stack = NULL;
1749                 stack_index_t i;
1750
1751                 if (bio) {
1752                         stack = PEM_X509_INFO_read_bio(bio, NULL, NULL, NULL);
1753                         BIO_free(bio);
1754                 }
1755                 if (!stack)
1756                         return -1;
1757
1758                 for (i = 0; i < sk_X509_INFO_num(stack); ++i) {
1759                         X509_INFO *info = sk_X509_INFO_value(stack, i);
1760                         if (info->x509) {
1761                                 X509_STORE_add_cert(ssl_ctx->cert_store,
1762                                                     info->x509);
1763                         }
1764                         if (info->crl) {
1765                                 X509_STORE_add_crl(ssl_ctx->cert_store,
1766                                                    info->crl);
1767                         }
1768                 }
1769                 sk_X509_INFO_pop_free(stack, X509_INFO_free);
1770                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1771                 return 0;
1772         }
1773 #endif /* ANDROID */
1774
1775 #ifdef CONFIG_NATIVE_WINDOWS
1776         if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
1777             0) {
1778                 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
1779                            "system certificate store");
1780                 return 0;
1781         }
1782 #endif /* CONFIG_NATIVE_WINDOWS */
1783
1784         if (ca_cert || ca_path) {
1785 #ifndef OPENSSL_NO_STDIO
1786                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
1787                     1) {
1788                         tls_show_errors(MSG_WARNING, __func__,
1789                                         "Failed to load root certificates");
1790                         if (ca_cert &&
1791                             tls_load_ca_der(ssl_ctx, ca_cert) == 0) {
1792                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
1793                                            "DER format CA certificate",
1794                                            __func__);
1795                         } else
1796                                 return -1;
1797                 } else {
1798                         wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1799                                    "certificate(s) loaded");
1800                         tls_get_errors(ssl_ctx);
1801                 }
1802 #else /* OPENSSL_NO_STDIO */
1803                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1804                            __func__);
1805                 return -1;
1806 #endif /* OPENSSL_NO_STDIO */
1807         } else {
1808                 /* No ca_cert configured - do not try to verify server
1809                  * certificate */
1810                 conn->ca_cert_verify = 0;
1811         }
1812
1813         return 0;
1814 }
1815
1816
1817 static int tls_global_ca_cert(SSL_CTX *ssl_ctx, const char *ca_cert)
1818 {
1819         if (ca_cert) {
1820                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
1821                 {
1822                         tls_show_errors(MSG_WARNING, __func__,
1823                                         "Failed to load root certificates");
1824                         return -1;
1825                 }
1826
1827                 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1828                            "certificate(s) loaded");
1829
1830 #ifndef OPENSSL_NO_STDIO
1831                 /* Add the same CAs to the client certificate requests */
1832                 SSL_CTX_set_client_CA_list(ssl_ctx,
1833                                            SSL_load_client_CA_file(ca_cert));
1834 #endif /* OPENSSL_NO_STDIO */
1835         }
1836
1837         return 0;
1838 }
1839
1840
1841 int tls_global_set_verify(void *ssl_ctx, int check_crl)
1842 {
1843         int flags;
1844
1845         if (check_crl) {
1846                 X509_STORE *cs = SSL_CTX_get_cert_store(ssl_ctx);
1847                 if (cs == NULL) {
1848                         tls_show_errors(MSG_INFO, __func__, "Failed to get "
1849                                         "certificate store when enabling "
1850                                         "check_crl");
1851                         return -1;
1852                 }
1853                 flags = X509_V_FLAG_CRL_CHECK;
1854                 if (check_crl == 2)
1855                         flags |= X509_V_FLAG_CRL_CHECK_ALL;
1856                 X509_STORE_set_flags(cs, flags);
1857         }
1858         return 0;
1859 }
1860
1861
1862 static int tls_connection_set_subject_match(struct tls_connection *conn,
1863                                             const char *subject_match,
1864                                             const char *altsubject_match,
1865                                             const char *suffix_match,
1866                                             const char *domain_match)
1867 {
1868         os_free(conn->subject_match);
1869         conn->subject_match = NULL;
1870         if (subject_match) {
1871                 conn->subject_match = os_strdup(subject_match);
1872                 if (conn->subject_match == NULL)
1873                         return -1;
1874         }
1875
1876         os_free(conn->altsubject_match);
1877         conn->altsubject_match = NULL;
1878         if (altsubject_match) {
1879                 conn->altsubject_match = os_strdup(altsubject_match);
1880                 if (conn->altsubject_match == NULL)
1881                         return -1;
1882         }
1883
1884         os_free(conn->suffix_match);
1885         conn->suffix_match = NULL;
1886         if (suffix_match) {
1887                 conn->suffix_match = os_strdup(suffix_match);
1888                 if (conn->suffix_match == NULL)
1889                         return -1;
1890         }
1891
1892         os_free(conn->domain_match);
1893         conn->domain_match = NULL;
1894         if (domain_match) {
1895                 conn->domain_match = os_strdup(domain_match);
1896                 if (conn->domain_match == NULL)
1897                         return -1;
1898         }
1899
1900         return 0;
1901 }
1902
1903
1904 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
1905                               int verify_peer)
1906 {
1907         static int counter = 0;
1908
1909         if (conn == NULL)
1910                 return -1;
1911
1912         if (verify_peer) {
1913                 conn->ca_cert_verify = 1;
1914                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
1915                                SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
1916                                SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
1917         } else {
1918                 conn->ca_cert_verify = 0;
1919                 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
1920         }
1921
1922         SSL_set_accept_state(conn->ssl);
1923
1924         /*
1925          * Set session id context in order to avoid fatal errors when client
1926          * tries to resume a session. However, set the context to a unique
1927          * value in order to effectively disable session resumption for now
1928          * since not all areas of the server code are ready for it (e.g.,
1929          * EAP-TTLS needs special handling for Phase 2 after abbreviated TLS
1930          * handshake).
1931          */
1932         counter++;
1933         SSL_set_session_id_context(conn->ssl,
1934                                    (const unsigned char *) &counter,
1935                                    sizeof(counter));
1936
1937         return 0;
1938 }
1939
1940
1941 static int tls_connection_client_cert(struct tls_connection *conn,
1942                                       const char *client_cert,
1943                                       const u8 *client_cert_blob,
1944                                       size_t client_cert_blob_len)
1945 {
1946         if (client_cert == NULL && client_cert_blob == NULL)
1947                 return 0;
1948
1949         if (client_cert_blob &&
1950             SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
1951                                      client_cert_blob_len) == 1) {
1952                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
1953                            "OK");
1954                 return 0;
1955         } else if (client_cert_blob) {
1956                 tls_show_errors(MSG_DEBUG, __func__,
1957                                 "SSL_use_certificate_ASN1 failed");
1958         }
1959
1960         if (client_cert == NULL)
1961                 return -1;
1962
1963 #ifdef ANDROID
1964         if (os_strncmp("keystore://", client_cert, 11) == 0) {
1965                 BIO *bio = BIO_from_keystore(&client_cert[11]);
1966                 X509 *x509 = NULL;
1967                 int ret = -1;
1968                 if (bio) {
1969                         x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
1970                         BIO_free(bio);
1971                 }
1972                 if (x509) {
1973                         if (SSL_use_certificate(conn->ssl, x509) == 1)
1974                                 ret = 0;
1975                         X509_free(x509);
1976                 }
1977                 return ret;
1978         }
1979 #endif /* ANDROID */
1980
1981 #ifndef OPENSSL_NO_STDIO
1982         if (SSL_use_certificate_file(conn->ssl, client_cert,
1983                                      SSL_FILETYPE_ASN1) == 1) {
1984                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
1985                            " --> OK");
1986                 return 0;
1987         }
1988
1989         if (SSL_use_certificate_file(conn->ssl, client_cert,
1990                                      SSL_FILETYPE_PEM) == 1) {
1991                 ERR_clear_error();
1992                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
1993                            " --> OK");
1994                 return 0;
1995         }
1996
1997         tls_show_errors(MSG_DEBUG, __func__,
1998                         "SSL_use_certificate_file failed");
1999 #else /* OPENSSL_NO_STDIO */
2000         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
2001 #endif /* OPENSSL_NO_STDIO */
2002
2003         return -1;
2004 }
2005
2006
2007 static int tls_global_client_cert(SSL_CTX *ssl_ctx, const char *client_cert)
2008 {
2009 #ifndef OPENSSL_NO_STDIO
2010         if (client_cert == NULL)
2011                 return 0;
2012
2013         if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
2014                                          SSL_FILETYPE_ASN1) != 1 &&
2015             SSL_CTX_use_certificate_chain_file(ssl_ctx, client_cert) != 1 &&
2016             SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
2017                                          SSL_FILETYPE_PEM) != 1) {
2018                 tls_show_errors(MSG_INFO, __func__,
2019                                 "Failed to load client certificate");
2020                 return -1;
2021         }
2022         return 0;
2023 #else /* OPENSSL_NO_STDIO */
2024         if (client_cert == NULL)
2025                 return 0;
2026         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
2027         return -1;
2028 #endif /* OPENSSL_NO_STDIO */
2029 }
2030
2031
2032 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
2033 {
2034         if (password == NULL) {
2035                 return 0;
2036         }
2037         os_strlcpy(buf, (char *) password, size);
2038         return os_strlen(buf);
2039 }
2040
2041
2042 #ifdef PKCS12_FUNCS
2043 static int tls_parse_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, PKCS12 *p12,
2044                             const char *passwd)
2045 {
2046         EVP_PKEY *pkey;
2047         X509 *cert;
2048         STACK_OF(X509) *certs;
2049         int res = 0;
2050         char buf[256];
2051
2052         pkey = NULL;
2053         cert = NULL;
2054         certs = NULL;
2055         if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
2056                 tls_show_errors(MSG_DEBUG, __func__,
2057                                 "Failed to parse PKCS12 file");
2058                 PKCS12_free(p12);
2059                 return -1;
2060         }
2061         wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
2062
2063         if (cert) {
2064                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
2065                                   sizeof(buf));
2066                 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
2067                            "subject='%s'", buf);
2068                 if (ssl) {
2069                         if (SSL_use_certificate(ssl, cert) != 1)
2070                                 res = -1;
2071                 } else {
2072                         if (SSL_CTX_use_certificate(ssl_ctx, cert) != 1)
2073                                 res = -1;
2074                 }
2075                 X509_free(cert);
2076         }
2077
2078         if (pkey) {
2079                 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
2080                 if (ssl) {
2081                         if (SSL_use_PrivateKey(ssl, pkey) != 1)
2082                                 res = -1;
2083                 } else {
2084                         if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1)
2085                                 res = -1;
2086                 }
2087                 EVP_PKEY_free(pkey);
2088         }
2089
2090         if (certs) {
2091                 while ((cert = sk_X509_pop(certs)) != NULL) {
2092                         X509_NAME_oneline(X509_get_subject_name(cert), buf,
2093                                           sizeof(buf));
2094                         wpa_printf(MSG_DEBUG, "TLS: additional certificate"
2095                                    " from PKCS12: subject='%s'", buf);
2096                         /*
2097                          * There is no SSL equivalent for the chain cert - so
2098                          * always add it to the context...
2099                          */
2100                         if (SSL_CTX_add_extra_chain_cert(ssl_ctx, cert) != 1) {
2101                                 res = -1;
2102                                 break;
2103                         }
2104                 }
2105                 sk_X509_free(certs);
2106         }
2107
2108         PKCS12_free(p12);
2109
2110         if (res < 0)
2111                 tls_get_errors(ssl_ctx);
2112
2113         return res;
2114 }
2115 #endif  /* PKCS12_FUNCS */
2116
2117
2118 static int tls_read_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, const char *private_key,
2119                            const char *passwd)
2120 {
2121 #ifdef PKCS12_FUNCS
2122         FILE *f;
2123         PKCS12 *p12;
2124
2125         f = fopen(private_key, "rb");
2126         if (f == NULL)
2127                 return -1;
2128
2129         p12 = d2i_PKCS12_fp(f, NULL);
2130         fclose(f);
2131
2132         if (p12 == NULL) {
2133                 tls_show_errors(MSG_INFO, __func__,
2134                                 "Failed to use PKCS#12 file");
2135                 return -1;
2136         }
2137
2138         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
2139
2140 #else /* PKCS12_FUNCS */
2141         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
2142                    "p12/pfx files");
2143         return -1;
2144 #endif  /* PKCS12_FUNCS */
2145 }
2146
2147
2148 static int tls_read_pkcs12_blob(SSL_CTX *ssl_ctx, SSL *ssl,
2149                                 const u8 *blob, size_t len, const char *passwd)
2150 {
2151 #ifdef PKCS12_FUNCS
2152         PKCS12 *p12;
2153
2154         p12 = d2i_PKCS12(NULL, (const unsigned char **) &blob, len);
2155         if (p12 == NULL) {
2156                 tls_show_errors(MSG_INFO, __func__,
2157                                 "Failed to use PKCS#12 blob");
2158                 return -1;
2159         }
2160
2161         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
2162
2163 #else /* PKCS12_FUNCS */
2164         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
2165                    "p12/pfx blobs");
2166         return -1;
2167 #endif  /* PKCS12_FUNCS */
2168 }
2169
2170
2171 #ifndef OPENSSL_NO_ENGINE
2172 static int tls_engine_get_cert(struct tls_connection *conn,
2173                                const char *cert_id,
2174                                X509 **cert)
2175 {
2176         /* this runs after the private key is loaded so no PIN is required */
2177         struct {
2178                 const char *cert_id;
2179                 X509 *cert;
2180         } params;
2181         params.cert_id = cert_id;
2182         params.cert = NULL;
2183
2184         if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
2185                              0, &params, NULL, 1)) {
2186                 wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
2187                            " '%s' [%s]", cert_id,
2188                            ERR_error_string(ERR_get_error(), NULL));
2189                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
2190         }
2191         if (!params.cert) {
2192                 wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
2193                            " '%s'", cert_id);
2194                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
2195         }
2196         *cert = params.cert;
2197         return 0;
2198 }
2199 #endif /* OPENSSL_NO_ENGINE */
2200
2201
2202 static int tls_connection_engine_client_cert(struct tls_connection *conn,
2203                                              const char *cert_id)
2204 {
2205 #ifndef OPENSSL_NO_ENGINE
2206         X509 *cert;
2207
2208         if (tls_engine_get_cert(conn, cert_id, &cert))
2209                 return -1;
2210
2211         if (!SSL_use_certificate(conn->ssl, cert)) {
2212                 tls_show_errors(MSG_ERROR, __func__,
2213                                 "SSL_use_certificate failed");
2214                 X509_free(cert);
2215                 return -1;
2216         }
2217         X509_free(cert);
2218         wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
2219                    "OK");
2220         return 0;
2221
2222 #else /* OPENSSL_NO_ENGINE */
2223         return -1;
2224 #endif /* OPENSSL_NO_ENGINE */
2225 }
2226
2227
2228 static int tls_connection_engine_ca_cert(void *_ssl_ctx,
2229                                          struct tls_connection *conn,
2230                                          const char *ca_cert_id)
2231 {
2232 #ifndef OPENSSL_NO_ENGINE
2233         X509 *cert;
2234         SSL_CTX *ssl_ctx = _ssl_ctx;
2235         X509_STORE *store;
2236
2237         if (tls_engine_get_cert(conn, ca_cert_id, &cert))
2238                 return -1;
2239
2240         /* start off the same as tls_connection_ca_cert */
2241         store = X509_STORE_new();
2242         if (store == NULL) {
2243                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
2244                            "certificate store", __func__);
2245                 X509_free(cert);
2246                 return -1;
2247         }
2248         SSL_CTX_set_cert_store(ssl_ctx, store);
2249         if (!X509_STORE_add_cert(store, cert)) {
2250                 unsigned long err = ERR_peek_error();
2251                 tls_show_errors(MSG_WARNING, __func__,
2252                                 "Failed to add CA certificate from engine "
2253                                 "to certificate store");
2254                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
2255                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
2256                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
2257                                    " already in hash table error",
2258                                    __func__);
2259                 } else {
2260                         X509_free(cert);
2261                         return -1;
2262                 }
2263         }
2264         X509_free(cert);
2265         wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
2266                    "to certificate store", __func__);
2267         SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
2268         conn->ca_cert_verify = 1;
2269
2270         return 0;
2271
2272 #else /* OPENSSL_NO_ENGINE */
2273         return -1;
2274 #endif /* OPENSSL_NO_ENGINE */
2275 }
2276
2277
2278 static int tls_connection_engine_private_key(struct tls_connection *conn)
2279 {
2280 #ifndef OPENSSL_NO_ENGINE
2281         if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
2282                 tls_show_errors(MSG_ERROR, __func__,
2283                                 "ENGINE: cannot use private key for TLS");
2284                 return -1;
2285         }
2286         if (!SSL_check_private_key(conn->ssl)) {
2287                 tls_show_errors(MSG_INFO, __func__,
2288                                 "Private key failed verification");
2289                 return -1;
2290         }
2291         return 0;
2292 #else /* OPENSSL_NO_ENGINE */
2293         wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
2294                    "engine support was not compiled in");
2295         return -1;
2296 #endif /* OPENSSL_NO_ENGINE */
2297 }
2298
2299
2300 static int tls_connection_private_key(void *_ssl_ctx,
2301                                       struct tls_connection *conn,
2302                                       const char *private_key,
2303                                       const char *private_key_passwd,
2304                                       const u8 *private_key_blob,
2305                                       size_t private_key_blob_len)
2306 {
2307         SSL_CTX *ssl_ctx = _ssl_ctx;
2308         char *passwd;
2309         int ok;
2310
2311         if (private_key == NULL && private_key_blob == NULL)
2312                 return 0;
2313
2314         if (private_key_passwd) {
2315                 passwd = os_strdup(private_key_passwd);
2316                 if (passwd == NULL)
2317                         return -1;
2318         } else
2319                 passwd = NULL;
2320
2321         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
2322         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
2323
2324         ok = 0;
2325         while (private_key_blob) {
2326                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
2327                                             (u8 *) private_key_blob,
2328                                             private_key_blob_len) == 1) {
2329                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
2330                                    "ASN1(EVP_PKEY_RSA) --> OK");
2331                         ok = 1;
2332                         break;
2333                 }
2334
2335                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
2336                                             (u8 *) private_key_blob,
2337                                             private_key_blob_len) == 1) {
2338                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
2339                                    "ASN1(EVP_PKEY_DSA) --> OK");
2340                         ok = 1;
2341                         break;
2342                 }
2343
2344                 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
2345                                                (u8 *) private_key_blob,
2346                                                private_key_blob_len) == 1) {
2347                         wpa_printf(MSG_DEBUG, "OpenSSL: "
2348                                    "SSL_use_RSAPrivateKey_ASN1 --> OK");
2349                         ok = 1;
2350                         break;
2351                 }
2352
2353                 if (tls_read_pkcs12_blob(ssl_ctx, conn->ssl, private_key_blob,
2354                                          private_key_blob_len, passwd) == 0) {
2355                         wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
2356                                    "OK");
2357                         ok = 1;
2358                         break;
2359                 }
2360
2361                 break;
2362         }
2363
2364         while (!ok && private_key) {
2365 #ifndef OPENSSL_NO_STDIO
2366                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
2367                                             SSL_FILETYPE_ASN1) == 1) {
2368                         wpa_printf(MSG_DEBUG, "OpenSSL: "
2369                                    "SSL_use_PrivateKey_File (DER) --> OK");
2370                         ok = 1;
2371                         break;
2372                 }
2373
2374                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
2375                                             SSL_FILETYPE_PEM) == 1) {
2376                         wpa_printf(MSG_DEBUG, "OpenSSL: "
2377                                    "SSL_use_PrivateKey_File (PEM) --> OK");
2378                         ok = 1;
2379                         break;
2380                 }
2381 #else /* OPENSSL_NO_STDIO */
2382                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
2383                            __func__);
2384 #endif /* OPENSSL_NO_STDIO */
2385
2386                 if (tls_read_pkcs12(ssl_ctx, conn->ssl, private_key, passwd)
2387                     == 0) {
2388                         wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
2389                                    "--> OK");
2390                         ok = 1;
2391                         break;
2392                 }
2393
2394                 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
2395                         wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
2396                                    "access certificate store --> OK");
2397                         ok = 1;
2398                         break;
2399                 }
2400
2401                 break;
2402         }
2403
2404         if (!ok) {
2405                 tls_show_errors(MSG_INFO, __func__,
2406                                 "Failed to load private key");
2407                 os_free(passwd);
2408                 return -1;
2409         }
2410         ERR_clear_error();
2411         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2412         os_free(passwd);
2413
2414         if (!SSL_check_private_key(conn->ssl)) {
2415                 tls_show_errors(MSG_INFO, __func__, "Private key failed "
2416                                 "verification");
2417                 return -1;
2418         }
2419
2420         wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
2421         return 0;
2422 }
2423
2424
2425 static int tls_global_private_key(SSL_CTX *ssl_ctx, const char *private_key,
2426                                   const char *private_key_passwd)
2427 {
2428         char *passwd;
2429
2430         if (private_key == NULL)
2431                 return 0;
2432
2433         if (private_key_passwd) {
2434                 passwd = os_strdup(private_key_passwd);
2435                 if (passwd == NULL)
2436                         return -1;
2437         } else
2438                 passwd = NULL;
2439
2440         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
2441         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
2442         if (
2443 #ifndef OPENSSL_NO_STDIO
2444             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2445                                         SSL_FILETYPE_ASN1) != 1 &&
2446             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2447                                         SSL_FILETYPE_PEM) != 1 &&
2448 #endif /* OPENSSL_NO_STDIO */
2449             tls_read_pkcs12(ssl_ctx, NULL, private_key, passwd)) {
2450                 tls_show_errors(MSG_INFO, __func__,
2451                                 "Failed to load private key");
2452                 os_free(passwd);
2453                 ERR_clear_error();
2454                 return -1;
2455         }
2456         os_free(passwd);
2457         ERR_clear_error();
2458         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2459
2460         if (!SSL_CTX_check_private_key(ssl_ctx)) {
2461                 tls_show_errors(MSG_INFO, __func__,
2462                                 "Private key failed verification");
2463                 return -1;
2464         }
2465
2466         return 0;
2467 }
2468
2469
2470 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
2471 {
2472 #ifdef OPENSSL_NO_DH
2473         if (dh_file == NULL)
2474                 return 0;
2475         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2476                    "dh_file specified");
2477         return -1;
2478 #else /* OPENSSL_NO_DH */
2479         DH *dh;
2480         BIO *bio;
2481
2482         /* TODO: add support for dh_blob */
2483         if (dh_file == NULL)
2484                 return 0;
2485         if (conn == NULL)
2486                 return -1;
2487
2488         bio = BIO_new_file(dh_file, "r");
2489         if (bio == NULL) {
2490                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
2491                            dh_file, ERR_error_string(ERR_get_error(), NULL));
2492                 return -1;
2493         }
2494         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
2495         BIO_free(bio);
2496 #ifndef OPENSSL_NO_DSA
2497         while (dh == NULL) {
2498                 DSA *dsa;
2499                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
2500                            " trying to parse as DSA params", dh_file,
2501                            ERR_error_string(ERR_get_error(), NULL));
2502                 bio = BIO_new_file(dh_file, "r");
2503                 if (bio == NULL)
2504                         break;
2505                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
2506                 BIO_free(bio);
2507                 if (!dsa) {
2508                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
2509                                    "'%s': %s", dh_file,
2510                                    ERR_error_string(ERR_get_error(), NULL));
2511                         break;
2512                 }
2513
2514                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2515                 dh = DSA_dup_DH(dsa);
2516                 DSA_free(dsa);
2517                 if (dh == NULL) {
2518                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2519                                    "params into DH params");
2520                         break;
2521                 }
2522                 break;
2523         }
2524 #endif /* !OPENSSL_NO_DSA */
2525         if (dh == NULL) {
2526                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2527                            "'%s'", dh_file);
2528                 return -1;
2529         }
2530
2531         if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
2532                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2533                            "%s", dh_file,
2534                            ERR_error_string(ERR_get_error(), NULL));
2535                 DH_free(dh);
2536                 return -1;
2537         }
2538         DH_free(dh);
2539         return 0;
2540 #endif /* OPENSSL_NO_DH */
2541 }
2542
2543
2544 static int tls_global_dh(SSL_CTX *ssl_ctx, const char *dh_file)
2545 {
2546 #ifdef OPENSSL_NO_DH
2547         if (dh_file == NULL)
2548                 return 0;
2549         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2550                    "dh_file specified");
2551         return -1;
2552 #else /* OPENSSL_NO_DH */
2553         DH *dh;
2554         BIO *bio;
2555
2556         /* TODO: add support for dh_blob */
2557         if (dh_file == NULL)
2558                 return 0;
2559         if (ssl_ctx == NULL)
2560                 return -1;
2561
2562         bio = BIO_new_file(dh_file, "r");
2563         if (bio == NULL) {
2564                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
2565                            dh_file, ERR_error_string(ERR_get_error(), NULL));
2566                 return -1;
2567         }
2568         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
2569         BIO_free(bio);
2570 #ifndef OPENSSL_NO_DSA
2571         while (dh == NULL) {
2572                 DSA *dsa;
2573                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
2574                            " trying to parse as DSA params", dh_file,
2575                            ERR_error_string(ERR_get_error(), NULL));
2576                 bio = BIO_new_file(dh_file, "r");
2577                 if (bio == NULL)
2578                         break;
2579                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
2580                 BIO_free(bio);
2581                 if (!dsa) {
2582                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
2583                                    "'%s': %s", dh_file,
2584                                    ERR_error_string(ERR_get_error(), NULL));
2585                         break;
2586                 }
2587
2588                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2589                 dh = DSA_dup_DH(dsa);
2590                 DSA_free(dsa);
2591                 if (dh == NULL) {
2592                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2593                                    "params into DH params");
2594                         break;
2595                 }
2596                 break;
2597         }
2598 #endif /* !OPENSSL_NO_DSA */
2599         if (dh == NULL) {
2600                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2601                            "'%s'", dh_file);
2602                 return -1;
2603         }
2604
2605         if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
2606                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2607                            "%s", dh_file,
2608                            ERR_error_string(ERR_get_error(), NULL));
2609                 DH_free(dh);
2610                 return -1;
2611         }
2612         DH_free(dh);
2613         return 0;
2614 #endif /* OPENSSL_NO_DH */
2615 }
2616
2617
2618 int tls_connection_get_keys(void *ssl_ctx, struct tls_connection *conn,
2619                             struct tls_keys *keys)
2620 {
2621 #ifdef CONFIG_FIPS
2622         wpa_printf(MSG_ERROR, "OpenSSL: TLS keys cannot be exported in FIPS "
2623                    "mode");
2624         return -1;
2625 #else /* CONFIG_FIPS */
2626         SSL *ssl;
2627
2628         if (conn == NULL || keys == NULL)
2629                 return -1;
2630         ssl = conn->ssl;
2631         if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL)
2632                 return -1;
2633
2634         os_memset(keys, 0, sizeof(*keys));
2635         keys->master_key = ssl->session->master_key;
2636         keys->master_key_len = ssl->session->master_key_length;
2637         keys->client_random = ssl->s3->client_random;
2638         keys->client_random_len = SSL3_RANDOM_SIZE;
2639         keys->server_random = ssl->s3->server_random;
2640         keys->server_random_len = SSL3_RANDOM_SIZE;
2641
2642         return 0;
2643 #endif /* CONFIG_FIPS */
2644 }
2645
2646
2647 int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
2648                        const char *label, int server_random_first,
2649                        u8 *out, size_t out_len)
2650 {
2651 #if OPENSSL_VERSION_NUMBER >= 0x10001000L
2652         SSL *ssl;
2653         if (conn == NULL)
2654                 return -1;
2655         if (server_random_first)
2656                 return -1;
2657         ssl = conn->ssl;
2658         if (SSL_export_keying_material(ssl, out, out_len, label,
2659                                        os_strlen(label), NULL, 0, 0) == 1) {
2660                 wpa_printf(MSG_DEBUG, "OpenSSL: Using internal PRF");
2661                 return 0;
2662         }
2663 #endif
2664         return -1;
2665 }
2666
2667
2668 static struct wpabuf *
2669 openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data,
2670                   int server)
2671 {
2672         int res;
2673         struct wpabuf *out_data;
2674
2675         /*
2676          * Give TLS handshake data from the server (if available) to OpenSSL
2677          * for processing.
2678          */
2679         if (in_data &&
2680             BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
2681             < 0) {
2682                 tls_show_errors(MSG_INFO, __func__,
2683                                 "Handshake failed - BIO_write");
2684                 return NULL;
2685         }
2686
2687         /* Initiate TLS handshake or continue the existing handshake */
2688         if (server)
2689                 res = SSL_accept(conn->ssl);
2690         else
2691                 res = SSL_connect(conn->ssl);
2692         if (res != 1) {
2693                 int err = SSL_get_error(conn->ssl, res);
2694                 if (err == SSL_ERROR_WANT_READ)
2695                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
2696                                    "more data");
2697                 else if (err == SSL_ERROR_WANT_WRITE)
2698                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
2699                                    "write");
2700                 else {
2701                         tls_show_errors(MSG_INFO, __func__, "SSL_connect");
2702                         conn->failed++;
2703                 }
2704         }
2705
2706         /* Get the TLS handshake data to be sent to the server */
2707         res = BIO_ctrl_pending(conn->ssl_out);
2708         wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
2709         out_data = wpabuf_alloc(res);
2710         if (out_data == NULL) {
2711                 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
2712                            "handshake output (%d bytes)", res);
2713                 if (BIO_reset(conn->ssl_out) < 0) {
2714                         tls_show_errors(MSG_INFO, __func__,
2715                                         "BIO_reset failed");
2716                 }
2717                 return NULL;
2718         }
2719         res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data),
2720                                       res);
2721         if (res < 0) {
2722                 tls_show_errors(MSG_INFO, __func__,
2723                                 "Handshake failed - BIO_read");
2724                 if (BIO_reset(conn->ssl_out) < 0) {
2725                         tls_show_errors(MSG_INFO, __func__,
2726                                         "BIO_reset failed");
2727                 }
2728                 wpabuf_free(out_data);
2729                 return NULL;
2730         }
2731         wpabuf_put(out_data, res);
2732
2733         return out_data;
2734 }
2735
2736
2737 static struct wpabuf *
2738 openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
2739 {
2740         struct wpabuf *appl_data;
2741         int res;
2742
2743         appl_data = wpabuf_alloc(max_len + 100);
2744         if (appl_data == NULL)
2745                 return NULL;
2746
2747         res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
2748                        wpabuf_size(appl_data));
2749         if (res < 0) {
2750                 int err = SSL_get_error(conn->ssl, res);
2751                 if (err == SSL_ERROR_WANT_READ ||
2752                     err == SSL_ERROR_WANT_WRITE) {
2753                         wpa_printf(MSG_DEBUG, "SSL: No Application Data "
2754                                    "included");
2755                 } else {
2756                         tls_show_errors(MSG_INFO, __func__,
2757                                         "Failed to read possible "
2758                                         "Application Data");
2759                 }
2760                 wpabuf_free(appl_data);
2761                 return NULL;
2762         }
2763
2764         wpabuf_put(appl_data, res);
2765         wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
2766                             "message", appl_data);
2767
2768         return appl_data;
2769 }
2770
2771
2772 static struct wpabuf *
2773 openssl_connection_handshake(struct tls_connection *conn,
2774                              const struct wpabuf *in_data,
2775                              struct wpabuf **appl_data, int server)
2776 {
2777         struct wpabuf *out_data;
2778
2779         if (appl_data)
2780                 *appl_data = NULL;
2781
2782         out_data = openssl_handshake(conn, in_data, server);
2783         if (out_data == NULL)
2784                 return NULL;
2785         if (conn->invalid_hb_used) {
2786                 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
2787                 wpabuf_free(out_data);
2788                 return NULL;
2789         }
2790
2791         if (SSL_is_init_finished(conn->ssl) && appl_data && in_data)
2792                 *appl_data = openssl_get_appl_data(conn, wpabuf_len(in_data));
2793
2794         if (conn->invalid_hb_used) {
2795                 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
2796                 if (appl_data) {
2797                         wpabuf_free(*appl_data);
2798                         *appl_data = NULL;
2799                 }
2800                 wpabuf_free(out_data);
2801                 return NULL;
2802         }
2803
2804         return out_data;
2805 }
2806
2807
2808 struct wpabuf *
2809 tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
2810                          const struct wpabuf *in_data,
2811                          struct wpabuf **appl_data)
2812 {
2813         return openssl_connection_handshake(conn, in_data, appl_data, 0);
2814 }
2815
2816
2817 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
2818                                                 struct tls_connection *conn,
2819                                                 const struct wpabuf *in_data,
2820                                                 struct wpabuf **appl_data)
2821 {
2822         return openssl_connection_handshake(conn, in_data, appl_data, 1);
2823 }
2824
2825
2826 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
2827                                        struct tls_connection *conn,
2828                                        const struct wpabuf *in_data)
2829 {
2830         int res;
2831         struct wpabuf *buf;
2832
2833         if (conn == NULL)
2834                 return NULL;
2835
2836         /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
2837         if ((res = BIO_reset(conn->ssl_in)) < 0 ||
2838             (res = BIO_reset(conn->ssl_out)) < 0) {
2839                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2840                 return NULL;
2841         }
2842         res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
2843         if (res < 0) {
2844                 tls_show_errors(MSG_INFO, __func__,
2845                                 "Encryption failed - SSL_write");
2846                 return NULL;
2847         }
2848
2849         /* Read encrypted data to be sent to the server */
2850         buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
2851         if (buf == NULL)
2852                 return NULL;
2853         res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
2854         if (res < 0) {
2855                 tls_show_errors(MSG_INFO, __func__,
2856                                 "Encryption failed - BIO_read");
2857                 wpabuf_free(buf);
2858                 return NULL;
2859         }
2860         wpabuf_put(buf, res);
2861
2862         return buf;
2863 }
2864
2865
2866 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
2867                                        struct tls_connection *conn,
2868                                        const struct wpabuf *in_data)
2869 {
2870         int res;
2871         struct wpabuf *buf;
2872
2873         /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
2874         res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
2875                         wpabuf_len(in_data));
2876         if (res < 0) {
2877                 tls_show_errors(MSG_INFO, __func__,
2878                                 "Decryption failed - BIO_write");
2879                 return NULL;
2880         }
2881         if (BIO_reset(conn->ssl_out) < 0) {
2882                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2883                 return NULL;
2884         }
2885
2886         /* Read decrypted data for further processing */
2887         /*
2888          * Even though we try to disable TLS compression, it is possible that
2889          * this cannot be done with all TLS libraries. Add extra buffer space
2890          * to handle the possibility of the decrypted data being longer than
2891          * input data.
2892          */
2893         buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
2894         if (buf == NULL)
2895                 return NULL;
2896         res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
2897         if (res < 0) {
2898                 tls_show_errors(MSG_INFO, __func__,
2899                                 "Decryption failed - SSL_read");
2900                 wpabuf_free(buf);
2901                 return NULL;
2902         }
2903         wpabuf_put(buf, res);
2904
2905         if (conn->invalid_hb_used) {
2906                 wpa_printf(MSG_INFO, "TLS: Heartbeat attack detected - do not send response");
2907                 wpabuf_free(buf);
2908                 return NULL;
2909         }
2910
2911         return buf;
2912 }
2913
2914
2915 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
2916 {
2917 #if OPENSSL_VERSION_NUMBER >= 0x10001000L
2918         return conn ? SSL_cache_hit(conn->ssl) : 0;
2919 #else
2920         return conn ? conn->ssl->hit : 0;
2921 #endif
2922 }
2923
2924
2925 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
2926                                    u8 *ciphers)
2927 {
2928         char buf[100], *pos, *end;
2929         u8 *c;
2930         int ret;
2931
2932         if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
2933                 return -1;
2934
2935         buf[0] = '\0';
2936         pos = buf;
2937         end = pos + sizeof(buf);
2938
2939         c = ciphers;
2940         while (*c != TLS_CIPHER_NONE) {
2941                 const char *suite;
2942
2943                 switch (*c) {
2944                 case TLS_CIPHER_RC4_SHA:
2945                         suite = "RC4-SHA";
2946                         break;
2947                 case TLS_CIPHER_AES128_SHA:
2948                         suite = "AES128-SHA";
2949                         break;
2950                 case TLS_CIPHER_RSA_DHE_AES128_SHA:
2951                         suite = "DHE-RSA-AES128-SHA";
2952                         break;
2953                 case TLS_CIPHER_ANON_DH_AES128_SHA:
2954                         suite = "ADH-AES128-SHA";
2955                         break;
2956                 default:
2957                         wpa_printf(MSG_DEBUG, "TLS: Unsupported "
2958                                    "cipher selection: %d", *c);
2959                         return -1;
2960                 }
2961                 ret = os_snprintf(pos, end - pos, ":%s", suite);
2962                 if (os_snprintf_error(end - pos, ret))
2963                         break;
2964                 pos += ret;
2965
2966                 c++;
2967         }
2968
2969         wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
2970
2971         if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
2972                 tls_show_errors(MSG_INFO, __func__,
2973                                 "Cipher suite configuration failed");
2974                 return -1;
2975         }
2976
2977         return 0;
2978 }
2979
2980
2981 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
2982                    char *buf, size_t buflen)
2983 {
2984         const char *name;
2985         if (conn == NULL || conn->ssl == NULL)
2986                 return -1;
2987
2988         name = SSL_get_cipher(conn->ssl);
2989         if (name == NULL)
2990                 return -1;
2991
2992         os_strlcpy(buf, name, buflen);
2993         return 0;
2994 }
2995
2996
2997 int tls_connection_enable_workaround(void *ssl_ctx,
2998                                      struct tls_connection *conn)
2999 {
3000         SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
3001
3002         return 0;
3003 }
3004
3005
3006 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
3007 /* ClientHello TLS extensions require a patch to openssl, so this function is
3008  * commented out unless explicitly needed for EAP-FAST in order to be able to
3009  * build this file with unmodified openssl. */
3010 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
3011                                     int ext_type, const u8 *data,
3012                                     size_t data_len)
3013 {
3014         if (conn == NULL || conn->ssl == NULL || ext_type != 35)
3015                 return -1;
3016
3017         if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
3018                                        data_len) != 1)
3019                 return -1;
3020
3021         return 0;
3022 }
3023 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3024
3025
3026 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
3027 {
3028         if (conn == NULL)
3029                 return -1;
3030         return conn->failed;
3031 }
3032
3033
3034 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
3035 {
3036         if (conn == NULL)
3037                 return -1;
3038         return conn->read_alerts;
3039 }
3040
3041
3042 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
3043 {
3044         if (conn == NULL)
3045                 return -1;
3046         return conn->write_alerts;
3047 }
3048
3049
3050 #ifdef HAVE_OCSP
3051
3052 static void ocsp_debug_print_resp(OCSP_RESPONSE *rsp)
3053 {
3054 #ifndef CONFIG_NO_STDOUT_DEBUG
3055         BIO *out;
3056         size_t rlen;
3057         char *txt;
3058         int res;
3059
3060         if (wpa_debug_level > MSG_DEBUG)
3061                 return;
3062
3063         out = BIO_new(BIO_s_mem());
3064         if (!out)
3065                 return;
3066
3067         OCSP_RESPONSE_print(out, rsp, 0);
3068         rlen = BIO_ctrl_pending(out);
3069         txt = os_malloc(rlen + 1);
3070         if (!txt) {
3071                 BIO_free(out);
3072                 return;
3073         }
3074
3075         res = BIO_read(out, txt, rlen);
3076         if (res > 0) {
3077                 txt[res] = '\0';
3078                 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP Response\n%s", txt);
3079         }
3080         os_free(txt);
3081         BIO_free(out);
3082 #endif /* CONFIG_NO_STDOUT_DEBUG */
3083 }
3084
3085
3086 static void debug_print_cert(X509 *cert, const char *title)
3087 {
3088 #ifndef CONFIG_NO_STDOUT_DEBUG
3089         BIO *out;
3090         size_t rlen;
3091         char *txt;
3092         int res;
3093
3094         if (wpa_debug_level > MSG_DEBUG)
3095                 return;
3096
3097         out = BIO_new(BIO_s_mem());
3098         if (!out)
3099                 return;
3100
3101         X509_print(out, cert);
3102         rlen = BIO_ctrl_pending(out);
3103         txt = os_malloc(rlen + 1);
3104         if (!txt) {
3105                 BIO_free(out);
3106                 return;
3107         }
3108
3109         res = BIO_read(out, txt, rlen);
3110         if (res > 0) {
3111                 txt[res] = '\0';
3112                 wpa_printf(MSG_DEBUG, "OpenSSL: %s\n%s", title, txt);
3113         }
3114         os_free(txt);
3115
3116         BIO_free(out);
3117 #endif /* CONFIG_NO_STDOUT_DEBUG */
3118 }
3119
3120
3121 static int ocsp_resp_cb(SSL *s, void *arg)
3122 {
3123         struct tls_connection *conn = arg;
3124         const unsigned char *p;
3125         int len, status, reason;
3126         OCSP_RESPONSE *rsp;
3127         OCSP_BASICRESP *basic;
3128         OCSP_CERTID *id;
3129         ASN1_GENERALIZEDTIME *produced_at, *this_update, *next_update;
3130         X509_STORE *store;
3131         STACK_OF(X509) *certs = NULL;
3132
3133         len = SSL_get_tlsext_status_ocsp_resp(s, &p);
3134         if (!p) {
3135                 wpa_printf(MSG_DEBUG, "OpenSSL: No OCSP response received");
3136                 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
3137         }
3138
3139         wpa_hexdump(MSG_DEBUG, "OpenSSL: OCSP response", p, len);
3140
3141         rsp = d2i_OCSP_RESPONSE(NULL, &p, len);
3142         if (!rsp) {
3143                 wpa_printf(MSG_INFO, "OpenSSL: Failed to parse OCSP response");
3144                 return 0;
3145         }
3146
3147         ocsp_debug_print_resp(rsp);
3148
3149         status = OCSP_response_status(rsp);
3150         if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
3151                 wpa_printf(MSG_INFO, "OpenSSL: OCSP responder error %d (%s)",
3152                            status, OCSP_response_status_str(status));
3153                 return 0;
3154         }
3155
3156         basic = OCSP_response_get1_basic(rsp);
3157         if (!basic) {
3158                 wpa_printf(MSG_INFO, "OpenSSL: Could not find BasicOCSPResponse");
3159                 return 0;
3160         }
3161
3162         store = SSL_CTX_get_cert_store(conn->ssl_ctx);
3163         if (conn->peer_issuer) {
3164                 debug_print_cert(conn->peer_issuer, "Add OCSP issuer");
3165
3166                 if (X509_STORE_add_cert(store, conn->peer_issuer) != 1) {
3167                         tls_show_errors(MSG_INFO, __func__,
3168                                         "OpenSSL: Could not add issuer to certificate store");
3169                 }
3170                 certs = sk_X509_new_null();
3171                 if (certs) {
3172                         X509 *cert;
3173                         cert = X509_dup(conn->peer_issuer);
3174                         if (cert && !sk_X509_push(certs, cert)) {
3175                                 tls_show_errors(
3176                                         MSG_INFO, __func__,
3177                                         "OpenSSL: Could not add issuer to OCSP responder trust store");
3178                                 X509_free(cert);
3179                                 sk_X509_free(certs);
3180                                 certs = NULL;
3181                         }
3182                         if (certs && conn->peer_issuer_issuer) {
3183                                 cert = X509_dup(conn->peer_issuer_issuer);
3184                                 if (cert && !sk_X509_push(certs, cert)) {
3185                                         tls_show_errors(
3186                                                 MSG_INFO, __func__,
3187                                                 "OpenSSL: Could not add issuer's issuer to OCSP responder trust store");
3188                                         X509_free(cert);
3189                                 }
3190                         }
3191                 }
3192         }
3193
3194         status = OCSP_basic_verify(basic, certs, store, OCSP_TRUSTOTHER);
3195         sk_X509_pop_free(certs, X509_free);
3196         if (status <= 0) {
3197                 tls_show_errors(MSG_INFO, __func__,
3198                                 "OpenSSL: OCSP response failed verification");
3199                 OCSP_BASICRESP_free(basic);
3200                 OCSP_RESPONSE_free(rsp);
3201                 return 0;
3202         }
3203
3204         wpa_printf(MSG_DEBUG, "OpenSSL: OCSP response verification succeeded");
3205
3206         if (!conn->peer_cert) {
3207                 wpa_printf(MSG_DEBUG, "OpenSSL: Peer certificate not available for OCSP status check");
3208                 OCSP_BASICRESP_free(basic);
3209                 OCSP_RESPONSE_free(rsp);
3210                 return 0;
3211         }
3212
3213         if (!conn->peer_issuer) {
3214                 wpa_printf(MSG_DEBUG, "OpenSSL: Peer issuer certificate not available for OCSP status check");
3215                 OCSP_BASICRESP_free(basic);
3216                 OCSP_RESPONSE_free(rsp);
3217                 return 0;
3218         }
3219
3220         id = OCSP_cert_to_id(NULL, conn->peer_cert, conn->peer_issuer);
3221         if (!id) {
3222                 wpa_printf(MSG_DEBUG, "OpenSSL: Could not create OCSP certificate identifier");
3223                 OCSP_BASICRESP_free(basic);
3224                 OCSP_RESPONSE_free(rsp);
3225                 return 0;
3226         }
3227
3228         if (!OCSP_resp_find_status(basic, id, &status, &reason, &produced_at,
3229                                    &this_update, &next_update)) {
3230                 wpa_printf(MSG_INFO, "OpenSSL: Could not find current server certificate from OCSP response%s",
3231                            (conn->flags & TLS_CONN_REQUIRE_OCSP) ? "" :
3232                            " (OCSP not required)");
3233                 OCSP_BASICRESP_free(basic);
3234                 OCSP_RESPONSE_free(rsp);
3235                 return (conn->flags & TLS_CONN_REQUIRE_OCSP) ? 0 : 1;
3236         }
3237
3238         if (!OCSP_check_validity(this_update, next_update, 5 * 60, -1)) {
3239                 tls_show_errors(MSG_INFO, __func__,
3240                                 "OpenSSL: OCSP status times invalid");
3241                 OCSP_BASICRESP_free(basic);
3242                 OCSP_RESPONSE_free(rsp);
3243                 return 0;
3244         }
3245
3246         OCSP_BASICRESP_free(basic);
3247         OCSP_RESPONSE_free(rsp);
3248
3249         wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status for server certificate: %s",
3250                    OCSP_cert_status_str(status));
3251
3252         if (status == V_OCSP_CERTSTATUS_GOOD)
3253                 return 1;
3254         if (status == V_OCSP_CERTSTATUS_REVOKED)
3255                 return 0;
3256         if (conn->flags & TLS_CONN_REQUIRE_OCSP) {
3257                 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP required");
3258                 return 0;
3259         }
3260         wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status unknown, but OCSP was not required, so allow connection to continue");
3261         return 1;
3262 }
3263
3264
3265 static int ocsp_status_cb(SSL *s, void *arg)
3266 {
3267         char *tmp;
3268         char *resp;
3269         size_t len;
3270
3271         if (tls_global->ocsp_stapling_response == NULL) {
3272                 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - no response configured");
3273                 return SSL_TLSEXT_ERR_OK;
3274         }
3275
3276         resp = os_readfile(tls_global->ocsp_stapling_response, &len);
3277         if (resp == NULL) {
3278                 wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - could not read response file");
3279                 /* TODO: Build OCSPResponse with responseStatus = internalError
3280                  */
3281                 return SSL_TLSEXT_ERR_OK;
3282         }
3283         wpa_printf(MSG_DEBUG, "OpenSSL: OCSP status callback - send cached response");
3284         tmp = OPENSSL_malloc(len);
3285         if (tmp == NULL) {
3286                 os_free(resp);
3287                 return SSL_TLSEXT_ERR_ALERT_FATAL;
3288         }
3289
3290         os_memcpy(tmp, resp, len);
3291         os_free(resp);
3292         SSL_set_tlsext_status_ocsp_resp(s, tmp, len);
3293
3294         return SSL_TLSEXT_ERR_OK;
3295 }
3296
3297 #endif /* HAVE_OCSP */
3298
3299
3300 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
3301                               const struct tls_connection_params *params)
3302 {
3303         int ret;
3304         unsigned long err;
3305         int can_pkcs11 = 0;
3306         const char *key_id = params->key_id;
3307         const char *cert_id = params->cert_id;
3308         const char *ca_cert_id = params->ca_cert_id;
3309         const char *engine_id = params->engine ? params->engine_id : NULL;
3310
3311         if (conn == NULL)
3312                 return -1;
3313
3314         /*
3315          * If the engine isn't explicitly configured, and any of the
3316          * cert/key fields are actually PKCS#11 URIs, then automatically
3317          * use the PKCS#11 ENGINE.
3318          */
3319         if (!engine_id || os_strcmp(engine_id, "pkcs11") == 0)
3320                 can_pkcs11 = 1;
3321
3322         if (!key_id && params->private_key && can_pkcs11 &&
3323             os_strncmp(params->private_key, "pkcs11:", 7) == 0) {
3324                 can_pkcs11 = 2;
3325                 key_id = params->private_key;
3326         }
3327
3328         if (!cert_id && params->client_cert && can_pkcs11 &&
3329             os_strncmp(params->client_cert, "pkcs11:", 7) == 0) {
3330                 can_pkcs11 = 2;
3331                 cert_id = params->client_cert;
3332         }
3333
3334         if (!ca_cert_id && params->ca_cert && can_pkcs11 &&
3335             os_strncmp(params->ca_cert, "pkcs11:", 7) == 0) {
3336                 can_pkcs11 = 2;
3337                 ca_cert_id = params->ca_cert;
3338         }
3339
3340         /* If we need to automatically enable the PKCS#11 ENGINE, do so. */
3341         if (can_pkcs11 == 2 && !engine_id)
3342                 engine_id = "pkcs11";
3343
3344         if (params->flags & TLS_CONN_EAP_FAST) {
3345                 wpa_printf(MSG_DEBUG,
3346                            "OpenSSL: Use TLSv1_method() for EAP-FAST");
3347                 if (SSL_set_ssl_method(conn->ssl, TLSv1_method()) != 1) {
3348                         tls_show_errors(MSG_INFO, __func__,
3349                                         "Failed to set TLSv1_method() for EAP-FAST");
3350                         return -1;
3351                 }
3352         }
3353
3354         while ((err = ERR_get_error())) {
3355                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
3356                            __func__, ERR_error_string(err, NULL));
3357         }
3358
3359         if (engine_id) {
3360                 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
3361                 ret = tls_engine_init(conn, engine_id, params->pin,
3362                                       key_id, cert_id, ca_cert_id);
3363                 if (ret)
3364                         return ret;
3365         }
3366         if (tls_connection_set_subject_match(conn,
3367                                              params->subject_match,
3368                                              params->altsubject_match,
3369                                              params->suffix_match,
3370                                              params->domain_match))
3371                 return -1;
3372
3373         if (engine_id && ca_cert_id) {
3374                 if (tls_connection_engine_ca_cert(tls_ctx, conn,
3375                                                   ca_cert_id))
3376                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
3377         } else if (tls_connection_ca_cert(tls_ctx, conn, params->ca_cert,
3378                                           params->ca_cert_blob,
3379                                           params->ca_cert_blob_len,
3380                                           params->ca_path))
3381                 return -1;
3382
3383         if (engine_id && cert_id) {
3384                 if (tls_connection_engine_client_cert(conn, cert_id))
3385                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
3386         } else if (tls_connection_client_cert(conn, params->client_cert,
3387                                               params->client_cert_blob,
3388                                               params->client_cert_blob_len))
3389                 return -1;
3390
3391         if (engine_id && key_id) {
3392                 wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
3393                 if (tls_connection_engine_private_key(conn))
3394                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
3395         } else if (tls_connection_private_key(tls_ctx, conn,
3396                                               params->private_key,
3397                                               params->private_key_passwd,
3398                                               params->private_key_blob,
3399                                               params->private_key_blob_len)) {
3400                 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
3401                            params->private_key);
3402                 return -1;
3403         }
3404
3405         if (tls_connection_dh(conn, params->dh_file)) {
3406                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
3407                            params->dh_file);
3408                 return -1;
3409         }
3410
3411         if (params->openssl_ciphers &&
3412             SSL_set_cipher_list(conn->ssl, params->openssl_ciphers) != 1) {
3413                 wpa_printf(MSG_INFO,
3414                            "OpenSSL: Failed to set cipher string '%s'",
3415                            params->openssl_ciphers);
3416                 return -1;
3417         }
3418
3419 #ifdef SSL_OP_NO_TICKET
3420         if (params->flags & TLS_CONN_DISABLE_SESSION_TICKET)
3421                 SSL_set_options(conn->ssl, SSL_OP_NO_TICKET);
3422 #ifdef SSL_clear_options
3423         else
3424                 SSL_clear_options(conn->ssl, SSL_OP_NO_TICKET);
3425 #endif /* SSL_clear_options */
3426 #endif /*  SSL_OP_NO_TICKET */
3427
3428 #ifdef SSL_OP_NO_TLSv1_1
3429         if (params->flags & TLS_CONN_DISABLE_TLSv1_1)
3430                 SSL_set_options(conn->ssl, SSL_OP_NO_TLSv1_1);
3431         else
3432                 SSL_clear_options(conn->ssl, SSL_OP_NO_TLSv1_1);
3433 #endif /* SSL_OP_NO_TLSv1_1 */
3434 #ifdef SSL_OP_NO_TLSv1_2
3435         if (params->flags & TLS_CONN_DISABLE_TLSv1_2)
3436                 SSL_set_options(conn->ssl, SSL_OP_NO_TLSv1_2);
3437         else
3438                 SSL_clear_options(conn->ssl, SSL_OP_NO_TLSv1_2);
3439 #endif /* SSL_OP_NO_TLSv1_2 */
3440
3441 #ifdef HAVE_OCSP
3442         if (params->flags & TLS_CONN_REQUEST_OCSP) {
3443                 SSL_CTX *ssl_ctx = tls_ctx;
3444                 SSL_set_tlsext_status_type(conn->ssl, TLSEXT_STATUSTYPE_ocsp);
3445                 SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_resp_cb);
3446                 SSL_CTX_set_tlsext_status_arg(ssl_ctx, conn);
3447         }
3448 #endif /* HAVE_OCSP */
3449
3450         conn->flags = params->flags;
3451
3452         tls_get_errors(tls_ctx);
3453
3454         return 0;
3455 }
3456
3457
3458 int tls_global_set_params(void *tls_ctx,
3459                           const struct tls_connection_params *params)
3460 {
3461         SSL_CTX *ssl_ctx = tls_ctx;
3462         unsigned long err;
3463
3464         while ((err = ERR_get_error())) {
3465                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
3466                            __func__, ERR_error_string(err, NULL));
3467         }
3468
3469         if (tls_global_ca_cert(ssl_ctx, params->ca_cert))
3470                 return -1;
3471
3472         if (tls_global_client_cert(ssl_ctx, params->client_cert))
3473                 return -1;
3474
3475         if (tls_global_private_key(ssl_ctx, params->private_key,
3476                                    params->private_key_passwd))
3477                 return -1;
3478
3479         if (tls_global_dh(ssl_ctx, params->dh_file)) {
3480                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
3481                            params->dh_file);
3482                 return -1;
3483         }
3484
3485         if (params->openssl_ciphers &&
3486             SSL_CTX_set_cipher_list(ssl_ctx, params->openssl_ciphers) != 1) {
3487                 wpa_printf(MSG_INFO,
3488                            "OpenSSL: Failed to set cipher string '%s'",
3489                            params->openssl_ciphers);
3490                 return -1;
3491         }
3492
3493 #ifdef SSL_OP_NO_TICKET
3494         if (params->flags & TLS_CONN_DISABLE_SESSION_TICKET)
3495                 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET);
3496 #ifdef SSL_CTX_clear_options
3497         else
3498                 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TICKET);
3499 #endif /* SSL_clear_options */
3500 #endif /*  SSL_OP_NO_TICKET */
3501
3502 #ifdef HAVE_OCSP
3503         SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_status_cb);
3504         SSL_CTX_set_tlsext_status_arg(ssl_ctx, ssl_ctx);
3505         os_free(tls_global->ocsp_stapling_response);
3506         if (params->ocsp_stapling_response)
3507                 tls_global->ocsp_stapling_response =
3508                         os_strdup(params->ocsp_stapling_response);
3509         else
3510                 tls_global->ocsp_stapling_response = NULL;
3511 #endif /* HAVE_OCSP */
3512
3513         return 0;
3514 }
3515
3516
3517 int tls_connection_get_keyblock_size(void *tls_ctx,
3518                                      struct tls_connection *conn)
3519 {
3520         const EVP_CIPHER *c;
3521         const EVP_MD *h;
3522         int md_size;
3523
3524         if (conn == NULL || conn->ssl == NULL ||
3525             conn->ssl->enc_read_ctx == NULL ||
3526             conn->ssl->enc_read_ctx->cipher == NULL ||
3527             conn->ssl->read_hash == NULL)
3528                 return -1;
3529
3530         c = conn->ssl->enc_read_ctx->cipher;
3531 #if OPENSSL_VERSION_NUMBER >= 0x00909000L
3532         h = EVP_MD_CTX_md(conn->ssl->read_hash);
3533 #else
3534         h = conn->ssl->read_hash;
3535 #endif
3536         if (h)
3537                 md_size = EVP_MD_size(h);
3538 #if OPENSSL_VERSION_NUMBER >= 0x10000000L
3539         else if (conn->ssl->s3)
3540                 md_size = conn->ssl->s3->tmp.new_mac_secret_size;
3541 #endif
3542         else
3543                 return -1;
3544
3545         wpa_printf(MSG_DEBUG, "OpenSSL: keyblock size: key_len=%d MD_size=%d "
3546                    "IV_len=%d", EVP_CIPHER_key_length(c), md_size,
3547                    EVP_CIPHER_iv_length(c));
3548         return 2 * (EVP_CIPHER_key_length(c) +
3549                     md_size +
3550                     EVP_CIPHER_iv_length(c));
3551 }
3552
3553
3554 unsigned int tls_capabilities(void *tls_ctx)
3555 {
3556         return 0;
3557 }
3558
3559
3560 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
3561 /* Pre-shared secred requires a patch to openssl, so this function is
3562  * commented out unless explicitly needed for EAP-FAST in order to be able to
3563  * build this file with unmodified openssl. */
3564
3565 #ifdef OPENSSL_IS_BORINGSSL
3566 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
3567                            STACK_OF(SSL_CIPHER) *peer_ciphers,
3568                            const SSL_CIPHER **cipher, void *arg)
3569 #else /* OPENSSL_IS_BORINGSSL */
3570 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
3571                            STACK_OF(SSL_CIPHER) *peer_ciphers,
3572                            SSL_CIPHER **cipher, void *arg)
3573 #endif /* OPENSSL_IS_BORINGSSL */
3574 {
3575         struct tls_connection *conn = arg;
3576         int ret;
3577
3578         if (conn == NULL || conn->session_ticket_cb == NULL)
3579                 return 0;
3580
3581         ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
3582                                       conn->session_ticket,
3583                                       conn->session_ticket_len,
3584                                       s->s3->client_random,
3585                                       s->s3->server_random, secret);
3586         os_free(conn->session_ticket);
3587         conn->session_ticket = NULL;
3588
3589         if (ret <= 0)
3590                 return 0;
3591
3592         *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
3593         return 1;
3594 }
3595
3596
3597 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
3598                                      int len, void *arg)
3599 {
3600         struct tls_connection *conn = arg;
3601
3602         if (conn == NULL || conn->session_ticket_cb == NULL)
3603                 return 0;
3604
3605         wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
3606
3607         os_free(conn->session_ticket);
3608         conn->session_ticket = NULL;
3609
3610         wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
3611                     "extension", data, len);
3612
3613         conn->session_ticket = os_malloc(len);
3614         if (conn->session_ticket == NULL)
3615                 return 0;
3616
3617         os_memcpy(conn->session_ticket, data, len);
3618         conn->session_ticket_len = len;
3619
3620         return 1;
3621 }
3622 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3623
3624
3625 int tls_connection_set_session_ticket_cb(void *tls_ctx,
3626                                          struct tls_connection *conn,
3627                                          tls_session_ticket_cb cb,
3628                                          void *ctx)
3629 {
3630 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
3631         conn->session_ticket_cb = cb;
3632         conn->session_ticket_cb_ctx = ctx;
3633
3634         if (cb) {
3635                 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
3636                                               conn) != 1)
3637                         return -1;
3638                 SSL_set_session_ticket_ext_cb(conn->ssl,
3639                                               tls_session_ticket_ext_cb, conn);
3640         } else {
3641                 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
3642                         return -1;
3643                 SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
3644         }
3645
3646         return 0;
3647 #else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3648         return -1;
3649 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3650 }
3651
3652
3653 int tls_get_library_version(char *buf, size_t buf_len)
3654 {
3655         return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
3656                            OPENSSL_VERSION_TEXT,
3657                            SSLeay_version(SSLEAY_VERSION));
3658 }