src/crypto/tls_openssl.c

   1 /*
   2  * WPA Supplicant / SSL/TLS interface functions for openssl
   3  * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #ifndef CONFIG_SMARTCARD
  18 #ifndef OPENSSL_NO_ENGINE
  19 #define OPENSSL_NO_ENGINE
  20 #endif
  21 #endif
  22
  23 #include <openssl/ssl.h>
  24 #include <openssl/err.h>
  25 #include <openssl/pkcs12.h>
  26 #include <openssl/x509v3.h>
  27 #ifndef OPENSSL_NO_ENGINE
  28 #include <openssl/engine.h>
  29 #endif /* OPENSSL_NO_ENGINE */
  30
  31 #include "common.h"
  32 #include "tls.h"
  33
  34 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
  35 #define OPENSSL_d2i_TYPE const unsigned char **
  36 #else
  37 #define OPENSSL_d2i_TYPE unsigned char **
  38 #endif
  39
  40 #ifdef SSL_F_SSL_SET_SESSION_TICKET_EXT
  41 #ifdef SSL_OP_NO_TICKET
  42 /*
  43  * Session ticket override patch was merged into OpenSSL 0.9.9 tree on
  44  * 2008-11-15. This version uses a bit different API compared to the old patch.
  45  */
  46 #define CONFIG_OPENSSL_TICKET_OVERRIDE
  47 #endif
  48 #endif
  49
  50 static int tls_openssl_ref_count = 0;
  51
  52 struct tls_connection {
  53         SSL *ssl;
  54         BIO *ssl_in, *ssl_out;
  55 #ifndef OPENSSL_NO_ENGINE
  56         ENGINE *engine;        /* functional reference to the engine */
  57         EVP_PKEY *private_key; /* the private key if using engine */
  58 #endif /* OPENSSL_NO_ENGINE */
  59         char *subject_match, *altsubject_match;
  60         int read_alerts, write_alerts, failed;
  61
  62         tls_session_ticket_cb session_ticket_cb;
  63         void *session_ticket_cb_ctx;
  64
  65         /* SessionTicket received from OpenSSL hello_extension_cb (server) */
  66         u8 *session_ticket;
  67         size_t session_ticket_len;
  68 };
  69
  70
  71 #ifdef CONFIG_NO_STDOUT_DEBUG
  72
  73 static void _tls_show_errors(void)
  74 {
  75         unsigned long err;
  76
  77         while ((err = ERR_get_error())) {
  78                 /* Just ignore the errors, since stdout is disabled */
  79         }
  80 }
  81 #define tls_show_errors(l, f, t) _tls_show_errors()
  82
  83 #else /* CONFIG_NO_STDOUT_DEBUG */
  84
  85 static void tls_show_errors(int level, const char *func, const char *txt)
  86 {
  87         unsigned long err;
  88
  89         wpa_printf(level, "OpenSSL: %s - %s %s",
  90                    func, txt, ERR_error_string(ERR_get_error(), NULL));
  91
  92         while ((err = ERR_get_error())) {
  93                 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
  94                            ERR_error_string(err, NULL));
  95         }
  96 }
  97
  98 #endif /* CONFIG_NO_STDOUT_DEBUG */
  99
 100
 101 #ifdef CONFIG_NATIVE_WINDOWS
 102
 103 /* Windows CryptoAPI and access to certificate stores */
 104 #include <wincrypt.h>
 105
 106 #ifdef __MINGW32_VERSION
 107 /*
 108  * MinGW does not yet include all the needed definitions for CryptoAPI, so
 109  * define here whatever extra is needed.
 110  */
 111 #define CALG_SSL3_SHAMD5 (ALG_CLASS_HASH | ALG_TYPE_ANY | ALG_SID_SSL3SHAMD5)
 112 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
 113 #define CERT_STORE_READONLY_FLAG 0x00008000
 114 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
 115 #define CRYPT_ACQUIRE_COMPARE_KEY_FLAG 0x00000004
 116
 117 static BOOL WINAPI
 118 (*CryptAcquireCertificatePrivateKey)(PCCERT_CONTEXT pCert, DWORD dwFlags,
 119                                      void *pvReserved, HCRYPTPROV *phCryptProv,
 120                                      DWORD *pdwKeySpec, BOOL *pfCallerFreeProv)
 121 = NULL; /* to be loaded from crypt32.dll */
 122
 123 #ifdef CONFIG_MINGW32_LOAD_CERTENUM
 124 static PCCERT_CONTEXT WINAPI
 125 (*CertEnumCertificatesInStore)(HCERTSTORE hCertStore,
 126                                PCCERT_CONTEXT pPrevCertContext)
 127 = NULL; /* to be loaded from crypt32.dll */
 128 #endif /* CONFIG_MINGW32_LOAD_CERTENUM */
 129
 130 static int mingw_load_crypto_func(void)
 131 {
 132         HINSTANCE dll;
 133
 134         /* MinGW does not yet have full CryptoAPI support, so load the needed
 135          * function here. */
 136
 137         if (CryptAcquireCertificatePrivateKey)
 138                 return 0;
 139
 140         dll = LoadLibrary("crypt32");
 141         if (dll == NULL) {
 142                 wpa_printf(MSG_DEBUG, "CryptoAPI: Could not load crypt32 "
 143                            "library");
 144                 return -1;
 145         }
 146
 147         CryptAcquireCertificatePrivateKey = GetProcAddress(
 148                 dll, "CryptAcquireCertificatePrivateKey");
 149         if (CryptAcquireCertificatePrivateKey == NULL) {
 150                 wpa_printf(MSG_DEBUG, "CryptoAPI: Could not get "
 151                            "CryptAcquireCertificatePrivateKey() address from "
 152                            "crypt32 library");
 153                 return -1;
 154         }
 155
 156 #ifdef CONFIG_MINGW32_LOAD_CERTENUM
 157         CertEnumCertificatesInStore = (void *) GetProcAddress(
 158                 dll, "CertEnumCertificatesInStore");
 159         if (CertEnumCertificatesInStore == NULL) {
 160                 wpa_printf(MSG_DEBUG, "CryptoAPI: Could not get "
 161                            "CertEnumCertificatesInStore() address from "
 162                            "crypt32 library");
 163                 return -1;
 164         }
 165 #endif /* CONFIG_MINGW32_LOAD_CERTENUM */
 166
 167         return 0;
 168 }
 169
 170 #else /* __MINGW32_VERSION */
 171
 172 static int mingw_load_crypto_func(void)
 173 {
 174         return 0;
 175 }
 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, (OPENSSL_d2i_TYPE) &priv->cert->pbCertEncoded,
 399                         priv->cert->cbCertEncoded);
 400         if (cert == NULL) {
 401                 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
 402                            "encoding");
 403                 goto err;
 404         }
 405
 406         if (mingw_load_crypto_func())
 407                 goto err;
 408
 409         if (!CryptAcquireCertificatePrivateKey(priv->cert,
 410                                                CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
 411                                                NULL, &priv->crypt_prov,
 412                                                &priv->key_spec,
 413                                                &priv->free_crypt_prov)) {
 414                 cryptoapi_error("Failed to acquire a private key for the "
 415                                 "certificate");
 416                 goto err;
 417         }
 418
 419         rsa_meth->name = "Microsoft CryptoAPI RSA Method";
 420         rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
 421         rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
 422         rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
 423         rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
 424         rsa_meth->finish = cryptoapi_finish;
 425         rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
 426         rsa_meth->app_data = (char *) priv;
 427
 428         rsa = RSA_new();
 429         if (rsa == NULL) {
 430                 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
 431                        ERR_R_MALLOC_FAILURE);
 432                 goto err;
 433         }
 434
 435         if (!SSL_use_certificate(ssl, cert)) {
 436                 RSA_free(rsa);
 437                 rsa = NULL;
 438                 goto err;
 439         }
 440         pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
 441         X509_free(cert);
 442         cert = NULL;
 443
 444         rsa->n = BN_dup(pub_rsa->n);
 445         rsa->e = BN_dup(pub_rsa->e);
 446         if (!RSA_set_method(rsa, rsa_meth))
 447                 goto err;
 448
 449         if (!SSL_use_RSAPrivateKey(ssl, rsa))
 450                 goto err;
 451         RSA_free(rsa);
 452
 453         return 0;
 454
 455 err:
 456         if (cert)
 457                 X509_free(cert);
 458         if (rsa)
 459                 RSA_free(rsa);
 460         else {
 461                 os_free(rsa_meth);
 462                 cryptoapi_free_data(priv);
 463         }
 464         return -1;
 465 }
 466
 467
 468 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
 469 {
 470         HCERTSTORE cs;
 471         PCCERT_CONTEXT ctx = NULL;
 472         X509 *cert;
 473         char buf[128];
 474         const char *store;
 475 #ifdef UNICODE
 476         WCHAR *wstore;
 477 #endif /* UNICODE */
 478
 479         if (mingw_load_crypto_func())
 480                 return -1;
 481
 482         if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
 483                 return -1;
 484
 485         store = name + 13;
 486 #ifdef UNICODE
 487         wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
 488         if (wstore == NULL)
 489                 return -1;
 490         wsprintf(wstore, L"%S", store);
 491         cs = CertOpenSystemStore(0, wstore);
 492         os_free(wstore);
 493 #else /* UNICODE */
 494         cs = CertOpenSystemStore(0, store);
 495 #endif /* UNICODE */
 496         if (cs == NULL) {
 497                 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
 498                            "'%s': error=%d", __func__, store,
 499                            (int) GetLastError());
 500                 return -1;
 501         }
 502
 503         while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
 504                 cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ctx->pbCertEncoded,
 505                                 ctx->cbCertEncoded);
 506                 if (cert == NULL) {
 507                         wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
 508                                    "X509 DER encoding for CA cert");
 509                         continue;
 510                 }
 511
 512                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
 513                                   sizeof(buf));
 514                 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
 515                            "system certificate store: subject='%s'", buf);
 516
 517                 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
 518                         tls_show_errors(MSG_WARNING, __func__,
 519                                         "Failed to add ca_cert to OpenSSL "
 520                                         "certificate store");
 521                 }
 522
 523                 X509_free(cert);
 524         }
 525
 526         if (!CertCloseStore(cs, 0)) {
 527                 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
 528                            "'%s': error=%d", __func__, name + 13,
 529                            (int) GetLastError());
 530         }
 531
 532         return 0;
 533 }
 534
 535
 536 #else /* CONFIG_NATIVE_WINDOWS */
 537
 538 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 539 {
 540         return -1;
 541 }
 542
 543 #endif /* CONFIG_NATIVE_WINDOWS */
 544
 545
 546 static void ssl_info_cb(const SSL *ssl, int where, int ret)
 547 {
 548         const char *str;
 549         int w;
 550
 551         wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
 552         w = where & ~SSL_ST_MASK;
 553         if (w & SSL_ST_CONNECT)
 554                 str = "SSL_connect";
 555         else if (w & SSL_ST_ACCEPT)
 556                 str = "SSL_accept";
 557         else
 558                 str = "undefined";
 559
 560         if (where & SSL_CB_LOOP) {
 561                 wpa_printf(MSG_DEBUG, "SSL: %s:%s",
 562                            str, SSL_state_string_long(ssl));
 563         } else if (where & SSL_CB_ALERT) {
 564                 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
 565                            where & SSL_CB_READ ?
 566                            "read (remote end reported an error)" :
 567                            "write (local SSL3 detected an error)",
 568                            SSL_alert_type_string_long(ret),
 569                            SSL_alert_desc_string_long(ret));
 570                 if ((ret >> 8) == SSL3_AL_FATAL) {
 571                         struct tls_connection *conn =
 572                                 SSL_get_app_data((SSL *) ssl);
 573                         if (where & SSL_CB_READ)
 574                                 conn->read_alerts++;
 575                         else
 576                                 conn->write_alerts++;
 577                 }
 578         } else if (where & SSL_CB_EXIT && ret <= 0) {
 579                 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
 580                            str, ret == 0 ? "failed" : "error",
 581                            SSL_state_string_long(ssl));
 582         }
 583 }
 584
 585
 586 #ifndef OPENSSL_NO_ENGINE
 587 /**
 588  * tls_engine_load_dynamic_generic - load any openssl engine
 589  * @pre: an array of commands and values that load an engine initialized
 590  *       in the engine specific function
 591  * @post: an array of commands and values that initialize an already loaded
 592  *        engine (or %NULL if not required)
 593  * @id: the engine id of the engine to load (only required if post is not %NULL
 594  *
 595  * This function is a generic function that loads any openssl engine.
 596  *
 597  * Returns: 0 on success, -1 on failure
 598  */
 599 static int tls_engine_load_dynamic_generic(const char *pre[],
 600                                            const char *post[], const char *id)
 601 {
 602         ENGINE *engine;
 603         const char *dynamic_id = "dynamic";
 604
 605         engine = ENGINE_by_id(id);
 606         if (engine) {
 607                 ENGINE_free(engine);
 608                 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
 609                            "available", id);
 610                 return 0;
 611         }
 612         ERR_clear_error();
 613
 614         engine = ENGINE_by_id(dynamic_id);
 615         if (engine == NULL) {
 616                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 617                            dynamic_id,
 618                            ERR_error_string(ERR_get_error(), NULL));
 619                 return -1;
 620         }
 621
 622         /* Perform the pre commands. This will load the engine. */
 623         while (pre && pre[0]) {
 624                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
 625                 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
 626                         wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
 627                                    "%s %s [%s]", pre[0], pre[1],
 628                                    ERR_error_string(ERR_get_error(), NULL));
 629                         ENGINE_free(engine);
 630                         return -1;
 631                 }
 632                 pre += 2;
 633         }
 634
 635         /*
 636          * Free the reference to the "dynamic" engine. The loaded engine can
 637          * now be looked up using ENGINE_by_id().
 638          */
 639         ENGINE_free(engine);
 640
 641         engine = ENGINE_by_id(id);
 642         if (engine == NULL) {
 643                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 644                            id, ERR_error_string(ERR_get_error(), NULL));
 645                 return -1;
 646         }
 647
 648         while (post && post[0]) {
 649                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
 650                 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
 651                         wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
 652                                 " %s %s [%s]", post[0], post[1],
 653                                    ERR_error_string(ERR_get_error(), NULL));
 654                         ENGINE_remove(engine);
 655                         ENGINE_free(engine);
 656                         return -1;
 657                 }
 658                 post += 2;
 659         }
 660         ENGINE_free(engine);
 661
 662         return 0;
 663 }
 664
 665
 666 /**
 667  * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
 668  * @pkcs11_so_path: pksc11_so_path from the configuration
 669  * @pcks11_module_path: pkcs11_module_path from the configuration
 670  */
 671 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
 672                                           const char *pkcs11_module_path)
 673 {
 674         char *engine_id = "pkcs11";
 675         const char *pre_cmd[] = {
 676                 "SO_PATH", NULL /* pkcs11_so_path */,
 677                 "ID", NULL /* engine_id */,
 678                 "LIST_ADD", "1",
 679                 /* "NO_VCHECK", "1", */
 680                 "LOAD", NULL,
 681                 NULL, NULL
 682         };
 683         const char *post_cmd[] = {
 684                 "MODULE_PATH", NULL /* pkcs11_module_path */,
 685                 NULL, NULL
 686         };
 687
 688         if (!pkcs11_so_path || !pkcs11_module_path)
 689                 return 0;
 690
 691         pre_cmd[1] = pkcs11_so_path;
 692         pre_cmd[3] = engine_id;
 693         post_cmd[1] = pkcs11_module_path;
 694
 695         wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
 696                    pkcs11_so_path);
 697
 698         return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
 699 }
 700
 701
 702 /**
 703  * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
 704  * @opensc_so_path: opensc_so_path from the configuration
 705  */
 706 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
 707 {
 708         char *engine_id = "opensc";
 709         const char *pre_cmd[] = {
 710                 "SO_PATH", NULL /* opensc_so_path */,
 711                 "ID", NULL /* engine_id */,
 712                 "LIST_ADD", "1",
 713                 "LOAD", NULL,
 714                 NULL, NULL
 715         };
 716
 717         if (!opensc_so_path)
 718                 return 0;
 719
 720         pre_cmd[1] = opensc_so_path;
 721         pre_cmd[3] = engine_id;
 722
 723         wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
 724                    opensc_so_path);
 725
 726         return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
 727 }
 728 #endif /* OPENSSL_NO_ENGINE */
 729
 730
 731 void * tls_init(const struct tls_config *conf)
 732 {
 733         SSL_CTX *ssl;
 734
 735         if (tls_openssl_ref_count == 0) {
 736 #ifdef CONFIG_FIPS
 737 #ifdef OPENSSL_FIPS
 738                 if (conf->fips_mode) {
 739                         if (!FIPS_mode_set(1)) {
 740                                 wpa_printf(MSG_ERROR, "Failed to enable FIPS "
 741                                            "mode");
 742                                 ERR_load_crypto_strings();
 743                                 ERR_print_errors_fp(stderr);
 744                                 return NULL;
 745                         } else
 746                                 wpa_printf(MSG_INFO, "Running in FIPS mode");
 747                 }
 748 #else /* OPENSSL_FIPS */
 749                 if (conf->fips_mode) {
 750                         wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
 751                                    "supported");
 752                         return NULL;
 753                 }
 754 #endif /* OPENSSL_FIPS */
 755 #endif /* CONFIG_FIPS */
 756                 SSL_load_error_strings();
 757                 SSL_library_init();
 758 #ifndef OPENSSL_NO_SHA256
 759                 EVP_add_digest(EVP_sha256());
 760 #endif /* OPENSSL_NO_SHA256 */
 761                 /* TODO: if /dev/urandom is available, PRNG is seeded
 762                  * automatically. If this is not the case, random data should
 763                  * be added here. */
 764
 765 #ifdef PKCS12_FUNCS
 766                 PKCS12_PBE_add();
 767 #endif  /* PKCS12_FUNCS */
 768         }
 769         tls_openssl_ref_count++;
 770
 771         ssl = SSL_CTX_new(TLSv1_method());
 772         if (ssl == NULL)
 773                 return NULL;
 774
 775         SSL_CTX_set_info_callback(ssl, ssl_info_cb);
 776
 777 #ifndef OPENSSL_NO_ENGINE
 778         if (conf &&
 779             (conf->opensc_engine_path || conf->pkcs11_engine_path ||
 780              conf->pkcs11_module_path)) {
 781                 wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
 782                 ERR_load_ENGINE_strings();
 783                 ENGINE_load_dynamic();
 784
 785                 if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
 786                     tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
 787                                                    conf->pkcs11_module_path)) {
 788                         tls_deinit(ssl);
 789                         return NULL;
 790                 }
 791         }
 792 #endif /* OPENSSL_NO_ENGINE */
 793
 794         return ssl;
 795 }
 796
 797
 798 void tls_deinit(void *ssl_ctx)
 799 {
 800         SSL_CTX *ssl = ssl_ctx;
 801         SSL_CTX_free(ssl);
 802
 803         tls_openssl_ref_count--;
 804         if (tls_openssl_ref_count == 0) {
 805 #ifndef OPENSSL_NO_ENGINE
 806                 ENGINE_cleanup();
 807 #endif /* OPENSSL_NO_ENGINE */
 808                 CRYPTO_cleanup_all_ex_data();
 809                 ERR_remove_state(0);
 810                 ERR_free_strings();
 811                 EVP_cleanup();
 812         }
 813 }
 814
 815
 816 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
 817                            const char *pin, const char *key_id,
 818                            const char *cert_id, const char *ca_cert_id)
 819 {
 820 #ifndef OPENSSL_NO_ENGINE
 821         int ret = -1;
 822         if (engine_id == NULL) {
 823                 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
 824                 return -1;
 825         }
 826         if (pin == NULL) {
 827                 wpa_printf(MSG_ERROR, "ENGINE: Smartcard PIN not set");
 828                 return -1;
 829         }
 830         if (key_id == NULL) {
 831                 wpa_printf(MSG_ERROR, "ENGINE: Key Id not set");
 832                 return -1;
 833         }
 834
 835         ERR_clear_error();
 836         conn->engine = ENGINE_by_id(engine_id);
 837         if (!conn->engine) {
 838                 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
 839                            engine_id, ERR_error_string(ERR_get_error(), NULL));
 840                 goto err;
 841         }
 842         if (ENGINE_init(conn->engine) != 1) {
 843                 wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
 844                            "(engine: %s) [%s]", engine_id,
 845                            ERR_error_string(ERR_get_error(), NULL));
 846                 goto err;
 847         }
 848         wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
 849
 850         if (ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
 851                 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
 852                            ERR_error_string(ERR_get_error(), NULL));
 853                 goto err;
 854         }
 855         /* load private key first in-case PIN is required for cert */
 856         conn->private_key = ENGINE_load_private_key(conn->engine,
 857                                                     key_id, NULL, NULL);
 858         if (!conn->private_key) {
 859                 wpa_printf(MSG_ERROR, "ENGINE: cannot load private key with id"
 860                                 " '%s' [%s]", key_id,
 861                            ERR_error_string(ERR_get_error(), NULL));
 862                 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
 863                 goto err;
 864         }
 865
 866         /* handle a certificate and/or CA certificate */
 867         if (cert_id || ca_cert_id) {
 868                 const char *cmd_name = "LOAD_CERT_CTRL";
 869
 870                 /* test if the engine supports a LOAD_CERT_CTRL */
 871                 if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
 872                                  0, (void *)cmd_name, NULL)) {
 873                         wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
 874                                    " loading certificates");
 875                         ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
 876                         goto err;
 877                 }
 878         }
 879
 880         return 0;
 881
 882 err:
 883         if (conn->engine) {
 884                 ENGINE_free(conn->engine);
 885                 conn->engine = NULL;
 886         }
 887
 888         if (conn->private_key) {
 889                 EVP_PKEY_free(conn->private_key);
 890                 conn->private_key = NULL;
 891         }
 892
 893         return ret;
 894 #else /* OPENSSL_NO_ENGINE */
 895         return 0;
 896 #endif /* OPENSSL_NO_ENGINE */
 897 }
 898
 899
 900 static void tls_engine_deinit(struct tls_connection *conn)
 901 {
 902 #ifndef OPENSSL_NO_ENGINE
 903         wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
 904         if (conn->private_key) {
 905                 EVP_PKEY_free(conn->private_key);
 906                 conn->private_key = NULL;
 907         }
 908         if (conn->engine) {
 909                 ENGINE_finish(conn->engine);
 910                 conn->engine = NULL;
 911         }
 912 #endif /* OPENSSL_NO_ENGINE */
 913 }
 914
 915
 916 int tls_get_errors(void *ssl_ctx)
 917 {
 918         int count = 0;
 919         unsigned long err;
 920
 921         while ((err = ERR_get_error())) {
 922                 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
 923                            ERR_error_string(err, NULL));
 924                 count++;
 925         }
 926
 927         return count;
 928 }
 929
 930 struct tls_connection * tls_connection_init(void *ssl_ctx)
 931 {
 932         SSL_CTX *ssl = ssl_ctx;
 933         struct tls_connection *conn;
 934         long options;
 935
 936         conn = os_zalloc(sizeof(*conn));
 937         if (conn == NULL)
 938                 return NULL;
 939         conn->ssl = SSL_new(ssl);
 940         if (conn->ssl == NULL) {
 941                 tls_show_errors(MSG_INFO, __func__,
 942                                 "Failed to initialize new SSL connection");
 943                 os_free(conn);
 944                 return NULL;
 945         }
 946
 947         SSL_set_app_data(conn->ssl, conn);
 948         options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
 949                 SSL_OP_SINGLE_DH_USE;
 950 #ifdef SSL_OP_NO_COMPRESSION
 951         options |= SSL_OP_NO_COMPRESSION;
 952 #endif /* SSL_OP_NO_COMPRESSION */
 953         SSL_set_options(conn->ssl, options);
 954
 955         conn->ssl_in = BIO_new(BIO_s_mem());
 956         if (!conn->ssl_in) {
 957                 tls_show_errors(MSG_INFO, __func__,
 958                                 "Failed to create a new BIO for ssl_in");
 959                 SSL_free(conn->ssl);
 960                 os_free(conn);
 961                 return NULL;
 962         }
 963
 964         conn->ssl_out = BIO_new(BIO_s_mem());
 965         if (!conn->ssl_out) {
 966                 tls_show_errors(MSG_INFO, __func__,
 967                                 "Failed to create a new BIO for ssl_out");
 968                 SSL_free(conn->ssl);
 969                 BIO_free(conn->ssl_in);
 970                 os_free(conn);
 971                 return NULL;
 972         }
 973
 974         SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
 975
 976         return conn;
 977 }
 978
 979
 980 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
 981 {
 982         if (conn == NULL)
 983                 return;
 984         SSL_free(conn->ssl);
 985         tls_engine_deinit(conn);
 986         os_free(conn->subject_match);
 987         os_free(conn->altsubject_match);
 988         os_free(conn->session_ticket);
 989         os_free(conn);
 990 }
 991
 992
 993 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
 994 {
 995         return conn ? SSL_is_init_finished(conn->ssl) : 0;
 996 }
 997
 998
 999 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
1000 {
1001         if (conn == NULL)
1002                 return -1;
1003
1004         /* Shutdown previous TLS connection without notifying the peer
1005          * because the connection was already terminated in practice
1006          * and "close notify" shutdown alert would confuse AS. */
1007         SSL_set_quiet_shutdown(conn->ssl, 1);
1008         SSL_shutdown(conn->ssl);
1009         return 0;
1010 }
1011
1012
1013 static int tls_match_altsubject_component(X509 *cert, int type,
1014                                           const char *value, size_t len)
1015 {
1016         GENERAL_NAME *gen;
1017         void *ext;
1018         int i, found = 0;
1019
1020         ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1021
1022         for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1023                 gen = sk_GENERAL_NAME_value(ext, i);
1024                 if (gen->type != type)
1025                         continue;
1026                 if (os_strlen((char *) gen->d.ia5->data) == len &&
1027                     os_memcmp(value, gen->d.ia5->data, len) == 0)
1028                         found++;
1029         }
1030
1031         return found;
1032 }
1033
1034
1035 static int tls_match_altsubject(X509 *cert, const char *match)
1036 {
1037         int type;
1038         const char *pos, *end;
1039         size_t len;
1040
1041         pos = match;
1042         do {
1043                 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
1044                         type = GEN_EMAIL;
1045                         pos += 6;
1046                 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
1047                         type = GEN_DNS;
1048                         pos += 4;
1049                 } else if (os_strncmp(pos, "URI:", 4) == 0) {
1050                         type = GEN_URI;
1051                         pos += 4;
1052                 } else {
1053                         wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1054                                    "match '%s'", pos);
1055                         return 0;
1056                 }
1057                 end = os_strchr(pos, ';');
1058                 while (end) {
1059                         if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1060                             os_strncmp(end + 1, "DNS:", 4) == 0 ||
1061                             os_strncmp(end + 1, "URI:", 4) == 0)
1062                                 break;
1063                         end = os_strchr(end + 1, ';');
1064                 }
1065                 if (end)
1066                         len = end - pos;
1067                 else
1068                         len = os_strlen(pos);
1069                 if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1070                         return 1;
1071                 pos = end + 1;
1072         } while (end);
1073
1074         return 0;
1075 }
1076
1077
1078 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
1079 {
1080         char buf[256];
1081         X509 *err_cert;
1082         int err, depth;
1083         SSL *ssl;
1084         struct tls_connection *conn;
1085         char *match, *altmatch;
1086
1087         err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
1088         err = X509_STORE_CTX_get_error(x509_ctx);
1089         depth = X509_STORE_CTX_get_error_depth(x509_ctx);
1090         ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
1091                                          SSL_get_ex_data_X509_STORE_CTX_idx());
1092         X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
1093
1094         conn = SSL_get_app_data(ssl);
1095         match = conn ? conn->subject_match : NULL;
1096         altmatch = conn ? conn->altsubject_match : NULL;
1097
1098         if (!preverify_ok) {
1099                 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
1100                            " error %d (%s) depth %d for '%s'", err,
1101                            X509_verify_cert_error_string(err), depth, buf);
1102         } else {
1103                 wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - "
1104                            "preverify_ok=%d err=%d (%s) depth=%d buf='%s'",
1105                            preverify_ok, err,
1106                            X509_verify_cert_error_string(err), depth, buf);
1107                 if (depth == 0 && match && os_strstr(buf, match) == NULL) {
1108                         wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
1109                                    "match with '%s'", buf, match);
1110                         preverify_ok = 0;
1111                 } else if (depth == 0 && altmatch &&
1112                            !tls_match_altsubject(err_cert, altmatch)) {
1113                         wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
1114                                    "'%s' not found", altmatch);
1115                         preverify_ok = 0;
1116                 }
1117         }
1118
1119         return preverify_ok;
1120 }
1121
1122
1123 #ifndef OPENSSL_NO_STDIO
1124 static int tls_load_ca_der(void *_ssl_ctx, const char *ca_cert)
1125 {
1126         SSL_CTX *ssl_ctx = _ssl_ctx;
1127         X509_LOOKUP *lookup;
1128         int ret = 0;
1129
1130         lookup = X509_STORE_add_lookup(ssl_ctx->cert_store,
1131                                        X509_LOOKUP_file());
1132         if (lookup == NULL) {
1133                 tls_show_errors(MSG_WARNING, __func__,
1134                                 "Failed add lookup for X509 store");
1135                 return -1;
1136         }
1137
1138         if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
1139                 unsigned long err = ERR_peek_error();
1140                 tls_show_errors(MSG_WARNING, __func__,
1141                                 "Failed load CA in DER format");
1142                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1143                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1144                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1145                                    "cert already in hash table error",
1146                                    __func__);
1147                 } else
1148                         ret = -1;
1149         }
1150
1151         return ret;
1152 }
1153 #endif /* OPENSSL_NO_STDIO */
1154
1155
1156 static int tls_connection_ca_cert(void *_ssl_ctx, struct tls_connection *conn,
1157                                   const char *ca_cert, const u8 *ca_cert_blob,
1158                                   size_t ca_cert_blob_len, const char *ca_path)
1159 {
1160         SSL_CTX *ssl_ctx = _ssl_ctx;
1161
1162         /*
1163          * Remove previously configured trusted CA certificates before adding
1164          * new ones.
1165          */
1166         X509_STORE_free(ssl_ctx->cert_store);
1167         ssl_ctx->cert_store = X509_STORE_new();
1168         if (ssl_ctx->cert_store == NULL) {
1169                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1170                            "certificate store", __func__);
1171                 return -1;
1172         }
1173
1174         if (ca_cert_blob) {
1175                 X509 *cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ca_cert_blob,
1176                                       ca_cert_blob_len);
1177                 if (cert == NULL) {
1178                         tls_show_errors(MSG_WARNING, __func__,
1179                                         "Failed to parse ca_cert_blob");
1180                         return -1;
1181                 }
1182
1183                 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
1184                         unsigned long err = ERR_peek_error();
1185                         tls_show_errors(MSG_WARNING, __func__,
1186                                         "Failed to add ca_cert_blob to "
1187                                         "certificate store");
1188                         if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1189                             ERR_GET_REASON(err) ==
1190                             X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1191                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1192                                            "cert already in hash table error",
1193                                            __func__);
1194                         } else {
1195                                 X509_free(cert);
1196                                 return -1;
1197                         }
1198                 }
1199                 X509_free(cert);
1200                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
1201                            "to certificate store", __func__);
1202                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1203                 return 0;
1204         }
1205
1206 #ifdef CONFIG_NATIVE_WINDOWS
1207         if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
1208             0) {
1209                 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
1210                            "system certificate store");
1211                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1212                 return 0;
1213         }
1214 #endif /* CONFIG_NATIVE_WINDOWS */
1215
1216         if (ca_cert || ca_path) {
1217 #ifndef OPENSSL_NO_STDIO
1218                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
1219                     1) {
1220                         tls_show_errors(MSG_WARNING, __func__,
1221                                         "Failed to load root certificates");
1222                         if (ca_cert &&
1223                             tls_load_ca_der(ssl_ctx, ca_cert) == 0) {
1224                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
1225                                            "DER format CA certificate",
1226                                            __func__);
1227                         } else
1228                                 return -1;
1229                 } else {
1230                         wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1231                                    "certificate(s) loaded");
1232                         tls_get_errors(ssl_ctx);
1233                 }
1234                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1235 #else /* OPENSSL_NO_STDIO */
1236                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1237                            __func__);
1238                 return -1;
1239 #endif /* OPENSSL_NO_STDIO */
1240         } else {
1241                 /* No ca_cert configured - do not try to verify server
1242                  * certificate */
1243                 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
1244         }
1245
1246         return 0;
1247 }
1248
1249
1250 static int tls_global_ca_cert(SSL_CTX *ssl_ctx, const char *ca_cert)
1251 {
1252         if (ca_cert) {
1253                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
1254                 {
1255                         tls_show_errors(MSG_WARNING, __func__,
1256                                         "Failed to load root certificates");
1257                         return -1;
1258                 }
1259
1260                 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1261                            "certificate(s) loaded");
1262
1263 #ifndef OPENSSL_NO_STDIO
1264                 /* Add the same CAs to the client certificate requests */
1265                 SSL_CTX_set_client_CA_list(ssl_ctx,
1266                                            SSL_load_client_CA_file(ca_cert));
1267 #endif /* OPENSSL_NO_STDIO */
1268         }
1269
1270         return 0;
1271 }
1272
1273
1274 int tls_global_set_verify(void *ssl_ctx, int check_crl)
1275 {
1276         int flags;
1277
1278         if (check_crl) {
1279                 X509_STORE *cs = SSL_CTX_get_cert_store(ssl_ctx);
1280                 if (cs == NULL) {
1281                         tls_show_errors(MSG_INFO, __func__, "Failed to get "
1282                                         "certificate store when enabling "
1283                                         "check_crl");
1284                         return -1;
1285                 }
1286                 flags = X509_V_FLAG_CRL_CHECK;
1287                 if (check_crl == 2)
1288                         flags |= X509_V_FLAG_CRL_CHECK_ALL;
1289                 X509_STORE_set_flags(cs, flags);
1290         }
1291         return 0;
1292 }
1293
1294
1295 static int tls_connection_set_subject_match(struct tls_connection *conn,
1296                                             const char *subject_match,
1297                                             const char *altsubject_match)
1298 {
1299         os_free(conn->subject_match);
1300         conn->subject_match = NULL;
1301         if (subject_match) {
1302                 conn->subject_match = os_strdup(subject_match);
1303                 if (conn->subject_match == NULL)
1304                         return -1;
1305         }
1306
1307         os_free(conn->altsubject_match);
1308         conn->altsubject_match = NULL;
1309         if (altsubject_match) {
1310                 conn->altsubject_match = os_strdup(altsubject_match);
1311                 if (conn->altsubject_match == NULL)
1312                         return -1;
1313         }
1314
1315         return 0;
1316 }
1317
1318
1319 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
1320                               int verify_peer)
1321 {
1322         static int counter = 0;
1323
1324         if (conn == NULL)
1325                 return -1;
1326
1327         if (verify_peer) {
1328                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
1329                                SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
1330                                SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
1331         } else {
1332                 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
1333         }
1334
1335         SSL_set_accept_state(conn->ssl);
1336
1337         /*
1338          * Set session id context in order to avoid fatal errors when client
1339          * tries to resume a session. However, set the context to a unique
1340          * value in order to effectively disable session resumption for now
1341          * since not all areas of the server code are ready for it (e.g.,
1342          * EAP-TTLS needs special handling for Phase 2 after abbreviated TLS
1343          * handshake).
1344          */
1345         counter++;
1346         SSL_set_session_id_context(conn->ssl,
1347                                    (const unsigned char *) &counter,
1348                                    sizeof(counter));
1349
1350         return 0;
1351 }
1352
1353
1354 static int tls_connection_client_cert(struct tls_connection *conn,
1355                                       const char *client_cert,
1356                                       const u8 *client_cert_blob,
1357                                       size_t client_cert_blob_len)
1358 {
1359         if (client_cert == NULL && client_cert_blob == NULL)
1360                 return 0;
1361
1362         if (client_cert_blob &&
1363             SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
1364                                      client_cert_blob_len) == 1) {
1365                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
1366                            "OK");
1367                 return 0;
1368         } else if (client_cert_blob) {
1369                 tls_show_errors(MSG_DEBUG, __func__,
1370                                 "SSL_use_certificate_ASN1 failed");
1371         }
1372
1373         if (client_cert == NULL)
1374                 return -1;
1375
1376 #ifndef OPENSSL_NO_STDIO
1377         if (SSL_use_certificate_file(conn->ssl, client_cert,
1378                                      SSL_FILETYPE_ASN1) == 1) {
1379                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
1380                            " --> OK");
1381                 return 0;
1382         } else {
1383                 tls_show_errors(MSG_DEBUG, __func__,
1384                                 "SSL_use_certificate_file (DER) failed");
1385         }
1386
1387         if (SSL_use_certificate_file(conn->ssl, client_cert,
1388                                      SSL_FILETYPE_PEM) == 1) {
1389                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
1390                            " --> OK");
1391                 return 0;
1392         } else {
1393                 tls_show_errors(MSG_DEBUG, __func__,
1394                                 "SSL_use_certificate_file (PEM) failed");
1395         }
1396 #else /* OPENSSL_NO_STDIO */
1397         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1398 #endif /* OPENSSL_NO_STDIO */
1399
1400         return -1;
1401 }
1402
1403
1404 static int tls_global_client_cert(SSL_CTX *ssl_ctx, const char *client_cert)
1405 {
1406 #ifndef OPENSSL_NO_STDIO
1407         if (client_cert == NULL)
1408                 return 0;
1409
1410         if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1411                                          SSL_FILETYPE_ASN1) != 1 &&
1412             SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1413                                          SSL_FILETYPE_PEM) != 1) {
1414                 tls_show_errors(MSG_INFO, __func__,
1415                                 "Failed to load client certificate");
1416                 return -1;
1417         }
1418         return 0;
1419 #else /* OPENSSL_NO_STDIO */
1420         if (client_cert == NULL)
1421                 return 0;
1422         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1423         return -1;
1424 #endif /* OPENSSL_NO_STDIO */
1425 }
1426
1427
1428 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
1429 {
1430         if (password == NULL) {
1431                 return 0;
1432         }
1433         os_strlcpy(buf, (char *) password, size);
1434         return os_strlen(buf);
1435 }
1436
1437
1438 #ifdef PKCS12_FUNCS
1439 static int tls_parse_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, PKCS12 *p12,
1440                             const char *passwd)
1441 {
1442         EVP_PKEY *pkey;
1443         X509 *cert;
1444         STACK_OF(X509) *certs;
1445         int res = 0;
1446         char buf[256];
1447
1448         pkey = NULL;
1449         cert = NULL;
1450         certs = NULL;
1451         if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
1452                 tls_show_errors(MSG_DEBUG, __func__,
1453                                 "Failed to parse PKCS12 file");
1454                 PKCS12_free(p12);
1455                 return -1;
1456         }
1457         wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
1458
1459         if (cert) {
1460                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
1461                                   sizeof(buf));
1462                 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
1463                            "subject='%s'", buf);
1464                 if (ssl) {
1465                         if (SSL_use_certificate(ssl, cert) != 1)
1466                                 res = -1;
1467                 } else {
1468                         if (SSL_CTX_use_certificate(ssl_ctx, cert) != 1)
1469                                 res = -1;
1470                 }
1471                 X509_free(cert);
1472         }
1473
1474         if (pkey) {
1475                 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
1476                 if (ssl) {
1477                         if (SSL_use_PrivateKey(ssl, pkey) != 1)
1478                                 res = -1;
1479                 } else {
1480                         if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1)
1481                                 res = -1;
1482                 }
1483                 EVP_PKEY_free(pkey);
1484         }
1485
1486         if (certs) {
1487                 while ((cert = sk_X509_pop(certs)) != NULL) {
1488                         X509_NAME_oneline(X509_get_subject_name(cert), buf,
1489                                           sizeof(buf));
1490                         wpa_printf(MSG_DEBUG, "TLS: additional certificate"
1491                                    " from PKCS12: subject='%s'", buf);
1492                         /*
1493                          * There is no SSL equivalent for the chain cert - so
1494                          * always add it to the context...
1495                          */
1496                         if (SSL_CTX_add_extra_chain_cert(ssl_ctx, cert) != 1) {
1497                                 res = -1;
1498                                 break;
1499                         }
1500                 }
1501                 sk_X509_free(certs);
1502         }
1503
1504         PKCS12_free(p12);
1505
1506         if (res < 0)
1507                 tls_get_errors(ssl_ctx);
1508
1509         return res;
1510 }
1511 #endif  /* PKCS12_FUNCS */
1512
1513
1514 static int tls_read_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, const char *private_key,
1515                            const char *passwd)
1516 {
1517 #ifdef PKCS12_FUNCS
1518         FILE *f;
1519         PKCS12 *p12;
1520
1521         f = fopen(private_key, "rb");
1522         if (f == NULL)
1523                 return -1;
1524
1525         p12 = d2i_PKCS12_fp(f, NULL);
1526         fclose(f);
1527
1528         if (p12 == NULL) {
1529                 tls_show_errors(MSG_INFO, __func__,
1530                                 "Failed to use PKCS#12 file");
1531                 return -1;
1532         }
1533
1534         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1535
1536 #else /* PKCS12_FUNCS */
1537         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
1538                    "p12/pfx files");
1539         return -1;
1540 #endif  /* PKCS12_FUNCS */
1541 }
1542
1543
1544 static int tls_read_pkcs12_blob(SSL_CTX *ssl_ctx, SSL *ssl,
1545                                 const u8 *blob, size_t len, const char *passwd)
1546 {
1547 #ifdef PKCS12_FUNCS
1548         PKCS12 *p12;
1549
1550         p12 = d2i_PKCS12(NULL, (OPENSSL_d2i_TYPE) &blob, len);
1551         if (p12 == NULL) {
1552                 tls_show_errors(MSG_INFO, __func__,
1553                                 "Failed to use PKCS#12 blob");
1554                 return -1;
1555         }
1556
1557         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1558
1559 #else /* PKCS12_FUNCS */
1560         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
1561                    "p12/pfx blobs");
1562         return -1;
1563 #endif  /* PKCS12_FUNCS */
1564 }
1565
1566
1567 #ifndef OPENSSL_NO_ENGINE
1568 static int tls_engine_get_cert(struct tls_connection *conn,
1569                                const char *cert_id,
1570                                X509 **cert)
1571 {
1572         /* this runs after the private key is loaded so no PIN is required */
1573         struct {
1574                 const char *cert_id;
1575                 X509 *cert;
1576         } params;
1577         params.cert_id = cert_id;
1578         params.cert = NULL;
1579
1580         if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
1581                              0, &params, NULL, 1)) {
1582                 wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
1583                            " '%s' [%s]", cert_id,
1584                            ERR_error_string(ERR_get_error(), NULL));
1585                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1586         }
1587         if (!params.cert) {
1588                 wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
1589                            " '%s'", cert_id);
1590                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1591         }
1592         *cert = params.cert;
1593         return 0;
1594 }
1595 #endif /* OPENSSL_NO_ENGINE */
1596
1597
1598 static int tls_connection_engine_client_cert(struct tls_connection *conn,
1599                                              const char *cert_id)
1600 {
1601 #ifndef OPENSSL_NO_ENGINE
1602         X509 *cert;
1603
1604         if (tls_engine_get_cert(conn, cert_id, &cert))
1605                 return -1;
1606
1607         if (!SSL_use_certificate(conn->ssl, cert)) {
1608                 tls_show_errors(MSG_ERROR, __func__,
1609                                 "SSL_use_certificate failed");
1610                 X509_free(cert);
1611                 return -1;
1612         }
1613         X509_free(cert);
1614         wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
1615                    "OK");
1616         return 0;
1617
1618 #else /* OPENSSL_NO_ENGINE */
1619         return -1;
1620 #endif /* OPENSSL_NO_ENGINE */
1621 }
1622
1623
1624 static int tls_connection_engine_ca_cert(void *_ssl_ctx,
1625                                          struct tls_connection *conn,
1626                                          const char *ca_cert_id)
1627 {
1628 #ifndef OPENSSL_NO_ENGINE
1629         X509 *cert;
1630         SSL_CTX *ssl_ctx = _ssl_ctx;
1631
1632         if (tls_engine_get_cert(conn, ca_cert_id, &cert))
1633                 return -1;
1634
1635         /* start off the same as tls_connection_ca_cert */
1636         X509_STORE_free(ssl_ctx->cert_store);
1637         ssl_ctx->cert_store = X509_STORE_new();
1638         if (ssl_ctx->cert_store == NULL) {
1639                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1640                            "certificate store", __func__);
1641                 X509_free(cert);
1642                 return -1;
1643         }
1644         if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
1645                 unsigned long err = ERR_peek_error();
1646                 tls_show_errors(MSG_WARNING, __func__,
1647                                 "Failed to add CA certificate from engine "
1648                                 "to certificate store");
1649                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1650                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1651                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
1652                                    " already in hash table error",
1653                                    __func__);
1654                 } else {
1655                         X509_free(cert);
1656                         return -1;
1657                 }
1658         }
1659         X509_free(cert);
1660         wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
1661                    "to certificate store", __func__);
1662         SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1663         return 0;
1664
1665 #else /* OPENSSL_NO_ENGINE */
1666         return -1;
1667 #endif /* OPENSSL_NO_ENGINE */
1668 }
1669
1670
1671 static int tls_connection_engine_private_key(struct tls_connection *conn)
1672 {
1673 #ifndef OPENSSL_NO_ENGINE
1674         if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
1675                 tls_show_errors(MSG_ERROR, __func__,
1676                                 "ENGINE: cannot use private key for TLS");
1677                 return -1;
1678         }
1679         if (!SSL_check_private_key(conn->ssl)) {
1680                 tls_show_errors(MSG_INFO, __func__,
1681                                 "Private key failed verification");
1682                 return -1;
1683         }
1684         return 0;
1685 #else /* OPENSSL_NO_ENGINE */
1686         wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
1687                    "engine support was not compiled in");
1688         return -1;
1689 #endif /* OPENSSL_NO_ENGINE */
1690 }
1691
1692
1693 static int tls_connection_private_key(void *_ssl_ctx,
1694                                       struct tls_connection *conn,
1695                                       const char *private_key,
1696                                       const char *private_key_passwd,
1697                                       const u8 *private_key_blob,
1698                                       size_t private_key_blob_len)
1699 {
1700         SSL_CTX *ssl_ctx = _ssl_ctx;
1701         char *passwd;
1702         int ok;
1703
1704         if (private_key == NULL && private_key_blob == NULL)
1705                 return 0;
1706
1707         if (private_key_passwd) {
1708                 passwd = os_strdup(private_key_passwd);
1709                 if (passwd == NULL)
1710                         return -1;
1711         } else
1712                 passwd = NULL;
1713
1714         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
1715         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
1716
1717         ok = 0;
1718         while (private_key_blob) {
1719                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
1720                                             (u8 *) private_key_blob,
1721                                             private_key_blob_len) == 1) {
1722                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
1723                                    "ASN1(EVP_PKEY_RSA) --> OK");
1724                         ok = 1;
1725                         break;
1726                 } else {
1727                         tls_show_errors(MSG_DEBUG, __func__,
1728                                         "SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA)"
1729                                         " failed");
1730                 }
1731
1732                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
1733                                             (u8 *) private_key_blob,
1734                                             private_key_blob_len) == 1) {
1735                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
1736                                    "ASN1(EVP_PKEY_DSA) --> OK");
1737                         ok = 1;
1738                         break;
1739                 } else {
1740                         tls_show_errors(MSG_DEBUG, __func__,
1741                                         "SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA)"
1742                                         " failed");
1743                 }
1744
1745                 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
1746                                                (u8 *) private_key_blob,
1747                                                private_key_blob_len) == 1) {
1748                         wpa_printf(MSG_DEBUG, "OpenSSL: "
1749                                    "SSL_use_RSAPrivateKey_ASN1 --> OK");
1750                         ok = 1;
1751                         break;
1752                 } else {
1753                         tls_show_errors(MSG_DEBUG, __func__,
1754                                         "SSL_use_RSAPrivateKey_ASN1 failed");
1755                 }
1756
1757                 if (tls_read_pkcs12_blob(ssl_ctx, conn->ssl, private_key_blob,
1758                                          private_key_blob_len, passwd) == 0) {
1759                         wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
1760                                    "OK");
1761                         ok = 1;
1762                         break;
1763                 }
1764
1765                 break;
1766         }
1767
1768         while (!ok && private_key) {
1769 #ifndef OPENSSL_NO_STDIO
1770                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
1771                                             SSL_FILETYPE_ASN1) == 1) {
1772                         wpa_printf(MSG_DEBUG, "OpenSSL: "
1773                                    "SSL_use_PrivateKey_File (DER) --> OK");
1774                         ok = 1;
1775                         break;
1776                 } else {
1777                         tls_show_errors(MSG_DEBUG, __func__,
1778                                         "SSL_use_PrivateKey_File (DER) "
1779                                         "failed");
1780                 }
1781
1782                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
1783                                             SSL_FILETYPE_PEM) == 1) {
1784                         wpa_printf(MSG_DEBUG, "OpenSSL: "
1785                                    "SSL_use_PrivateKey_File (PEM) --> OK");
1786                         ok = 1;
1787                         break;
1788                 } else {
1789                         tls_show_errors(MSG_DEBUG, __func__,
1790                                         "SSL_use_PrivateKey_File (PEM) "
1791                                         "failed");
1792                 }
1793 #else /* OPENSSL_NO_STDIO */
1794                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1795                            __func__);
1796 #endif /* OPENSSL_NO_STDIO */
1797
1798                 if (tls_read_pkcs12(ssl_ctx, conn->ssl, private_key, passwd)
1799                     == 0) {
1800                         wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
1801                                    "--> OK");
1802                         ok = 1;
1803                         break;
1804                 }
1805
1806                 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
1807                         wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
1808                                    "access certificate store --> OK");
1809                         ok = 1;
1810                         break;
1811                 }
1812
1813                 break;
1814         }
1815
1816         if (!ok) {
1817                 wpa_printf(MSG_INFO, "OpenSSL: Failed to load private key");
1818                 os_free(passwd);
1819                 ERR_clear_error();
1820                 return -1;
1821         }
1822         ERR_clear_error();
1823         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
1824         os_free(passwd);
1825
1826         if (!SSL_check_private_key(conn->ssl)) {
1827                 tls_show_errors(MSG_INFO, __func__, "Private key failed "
1828                                 "verification");
1829                 return -1;
1830         }
1831
1832         wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
1833         return 0;
1834 }
1835
1836
1837 static int tls_global_private_key(SSL_CTX *ssl_ctx, const char *private_key,
1838                                   const char *private_key_passwd)
1839 {
1840         char *passwd;
1841
1842         if (private_key == NULL)
1843                 return 0;
1844
1845         if (private_key_passwd) {
1846                 passwd = os_strdup(private_key_passwd);
1847                 if (passwd == NULL)
1848                         return -1;
1849         } else
1850                 passwd = NULL;
1851
1852         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
1853         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
1854         if (
1855 #ifndef OPENSSL_NO_STDIO
1856             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
1857                                         SSL_FILETYPE_ASN1) != 1 &&
1858             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
1859                                         SSL_FILETYPE_PEM) != 1 &&
1860 #endif /* OPENSSL_NO_STDIO */
1861             tls_read_pkcs12(ssl_ctx, NULL, private_key, passwd)) {
1862                 tls_show_errors(MSG_INFO, __func__,
1863                                 "Failed to load private key");
1864                 os_free(passwd);
1865                 ERR_clear_error();
1866                 return -1;
1867         }
1868         os_free(passwd);
1869         ERR_clear_error();
1870         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
1871
1872         if (!SSL_CTX_check_private_key(ssl_ctx)) {
1873                 tls_show_errors(MSG_INFO, __func__,
1874                                 "Private key failed verification");
1875                 return -1;
1876         }
1877
1878         return 0;
1879 }
1880
1881
1882 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
1883 {
1884 #ifdef OPENSSL_NO_DH
1885         if (dh_file == NULL)
1886                 return 0;
1887         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
1888                    "dh_file specified");
1889         return -1;
1890 #else /* OPENSSL_NO_DH */
1891         DH *dh;
1892         BIO *bio;
1893
1894         /* TODO: add support for dh_blob */
1895         if (dh_file == NULL)
1896                 return 0;
1897         if (conn == NULL)
1898                 return -1;
1899
1900         bio = BIO_new_file(dh_file, "r");
1901         if (bio == NULL) {
1902                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
1903                            dh_file, ERR_error_string(ERR_get_error(), NULL));
1904                 return -1;
1905         }
1906         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
1907         BIO_free(bio);
1908 #ifndef OPENSSL_NO_DSA
1909         while (dh == NULL) {
1910                 DSA *dsa;
1911                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
1912                            " trying to parse as DSA params", dh_file,
1913                            ERR_error_string(ERR_get_error(), NULL));
1914                 bio = BIO_new_file(dh_file, "r");
1915                 if (bio == NULL)
1916                         break;
1917                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
1918                 BIO_free(bio);
1919                 if (!dsa) {
1920                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
1921                                    "'%s': %s", dh_file,
1922                                    ERR_error_string(ERR_get_error(), NULL));
1923                         break;
1924                 }
1925
1926                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
1927                 dh = DSA_dup_DH(dsa);
1928                 DSA_free(dsa);
1929                 if (dh == NULL) {
1930                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
1931                                    "params into DH params");
1932                         break;
1933                 }
1934                 break;
1935         }
1936 #endif /* !OPENSSL_NO_DSA */
1937         if (dh == NULL) {
1938                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
1939                            "'%s'", dh_file);
1940                 return -1;
1941         }
1942
1943         if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
1944                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
1945                            "%s", dh_file,
1946                            ERR_error_string(ERR_get_error(), NULL));
1947                 DH_free(dh);
1948                 return -1;
1949         }
1950         DH_free(dh);
1951         return 0;
1952 #endif /* OPENSSL_NO_DH */
1953 }
1954
1955
1956 static int tls_global_dh(SSL_CTX *ssl_ctx, const char *dh_file)
1957 {
1958 #ifdef OPENSSL_NO_DH
1959         if (dh_file == NULL)
1960                 return 0;
1961         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
1962                    "dh_file specified");
1963         return -1;
1964 #else /* OPENSSL_NO_DH */
1965         DH *dh;
1966         BIO *bio;
1967
1968         /* TODO: add support for dh_blob */
1969         if (dh_file == NULL)
1970                 return 0;
1971         if (ssl_ctx == NULL)
1972                 return -1;
1973
1974         bio = BIO_new_file(dh_file, "r");
1975         if (bio == NULL) {
1976                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
1977                            dh_file, ERR_error_string(ERR_get_error(), NULL));
1978                 return -1;
1979         }
1980         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
1981         BIO_free(bio);
1982 #ifndef OPENSSL_NO_DSA
1983         while (dh == NULL) {
1984                 DSA *dsa;
1985                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
1986                            " trying to parse as DSA params", dh_file,
1987                            ERR_error_string(ERR_get_error(), NULL));
1988                 bio = BIO_new_file(dh_file, "r");
1989                 if (bio == NULL)
1990                         break;
1991                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
1992                 BIO_free(bio);
1993                 if (!dsa) {
1994                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
1995                                    "'%s': %s", dh_file,
1996                                    ERR_error_string(ERR_get_error(), NULL));
1997                         break;
1998                 }
1999
2000                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2001                 dh = DSA_dup_DH(dsa);
2002                 DSA_free(dsa);
2003                 if (dh == NULL) {
2004                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2005                                    "params into DH params");
2006                         break;
2007                 }
2008                 break;
2009         }
2010 #endif /* !OPENSSL_NO_DSA */
2011         if (dh == NULL) {
2012                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2013                            "'%s'", dh_file);
2014                 return -1;
2015         }
2016
2017         if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
2018                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2019                            "%s", dh_file,
2020                            ERR_error_string(ERR_get_error(), NULL));
2021                 DH_free(dh);
2022                 return -1;
2023         }
2024         DH_free(dh);
2025         return 0;
2026 #endif /* OPENSSL_NO_DH */
2027 }
2028
2029
2030 int tls_connection_get_keys(void *ssl_ctx, struct tls_connection *conn,
2031                             struct tls_keys *keys)
2032 {
2033         SSL *ssl;
2034
2035         if (conn == NULL || keys == NULL)
2036                 return -1;
2037         ssl = conn->ssl;
2038         if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL)
2039                 return -1;
2040
2041         os_memset(keys, 0, sizeof(*keys));
2042         keys->master_key = ssl->session->master_key;
2043         keys->master_key_len = ssl->session->master_key_length;
2044         keys->client_random = ssl->s3->client_random;
2045         keys->client_random_len = SSL3_RANDOM_SIZE;
2046         keys->server_random = ssl->s3->server_random;
2047         keys->server_random_len = SSL3_RANDOM_SIZE;
2048
2049         return 0;
2050 }
2051
2052
2053 int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
2054                        const char *label, int server_random_first,
2055                        u8 *out, size_t out_len)
2056 {
2057         return -1;
2058 }
2059
2060
2061 u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
2062                               const u8 *in_data, size_t in_len,
2063                               size_t *out_len, u8 **appl_data,
2064                               size_t *appl_data_len)
2065 {
2066         int res;
2067         u8 *out_data;
2068
2069         if (appl_data)
2070                 *appl_data = NULL;
2071
2072         /*
2073          * Give TLS handshake data from the server (if available) to OpenSSL
2074          * for processing.
2075          */
2076         if (in_data &&
2077             BIO_write(conn->ssl_in, in_data, in_len) < 0) {
2078                 tls_show_errors(MSG_INFO, __func__,
2079                                 "Handshake failed - BIO_write");
2080                 return NULL;
2081         }
2082
2083         /* Initiate TLS handshake or continue the existing handshake */
2084         res = SSL_connect(conn->ssl);
2085         if (res != 1) {
2086                 int err = SSL_get_error(conn->ssl, res);
2087                 if (err == SSL_ERROR_WANT_READ)
2088                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
2089                                    "more data");
2090                 else if (err == SSL_ERROR_WANT_WRITE)
2091                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
2092                                    "write");
2093                 else {
2094                         tls_show_errors(MSG_INFO, __func__, "SSL_connect");
2095                         conn->failed++;
2096                 }
2097         }
2098
2099         /* Get the TLS handshake data to be sent to the server */
2100         res = BIO_ctrl_pending(conn->ssl_out);
2101         wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
2102         out_data = os_malloc(res == 0 ? 1 : res);
2103         if (out_data == NULL) {
2104                 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
2105                            "handshake output (%d bytes)", res);
2106                 if (BIO_reset(conn->ssl_out) < 0) {
2107                         tls_show_errors(MSG_INFO, __func__,
2108                                         "BIO_reset failed");
2109                 }
2110                 *out_len = 0;
2111                 return NULL;
2112         }
2113         res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
2114         if (res < 0) {
2115                 tls_show_errors(MSG_INFO, __func__,
2116                                 "Handshake failed - BIO_read");
2117                 if (BIO_reset(conn->ssl_out) < 0) {
2118                         tls_show_errors(MSG_INFO, __func__,
2119                                         "BIO_reset failed");
2120                 }
2121                 *out_len = 0;
2122                 return NULL;
2123         }
2124         *out_len = res;
2125
2126         if (SSL_is_init_finished(conn->ssl) && appl_data) {
2127                 *appl_data = os_malloc(in_len);
2128                 if (*appl_data) {
2129                         res = SSL_read(conn->ssl, *appl_data, in_len);
2130                         if (res < 0) {
2131                                 tls_show_errors(MSG_INFO, __func__,
2132                                                 "Failed to read possible "
2133                                                 "Application Data");
2134                                 os_free(*appl_data);
2135                                 *appl_data = NULL;
2136                         } else {
2137                                 *appl_data_len = res;
2138                                 wpa_hexdump_key(MSG_MSGDUMP, "SSL: Application"
2139                                                 " Data in Finish message",
2140                                                 *appl_data, *appl_data_len);
2141                         }
2142                 }
2143         }
2144
2145         return out_data;
2146 }
2147
2148
2149 u8 * tls_connection_server_handshake(void *ssl_ctx,
2150                                      struct tls_connection *conn,
2151                                      const u8 *in_data, size_t in_len,
2152                                      size_t *out_len)
2153 {
2154         int res;
2155         u8 *out_data;
2156
2157         /*
2158          * Give TLS handshake data from the client (if available) to OpenSSL
2159          * for processing.
2160          */
2161         if (in_data &&
2162             BIO_write(conn->ssl_in, in_data, in_len) < 0) {
2163                 tls_show_errors(MSG_INFO, __func__,
2164                                 "Handshake failed - BIO_write");
2165                 return NULL;
2166         }
2167
2168         /* Initiate TLS handshake or continue the existing handshake */
2169         res = SSL_accept(conn->ssl);
2170         if (res != 1) {
2171                 int err = SSL_get_error(conn->ssl, res);
2172                 if (err == SSL_ERROR_WANT_READ)
2173                         wpa_printf(MSG_DEBUG, "SSL: SSL_accept - want "
2174                                    "more data");
2175                 else if (err == SSL_ERROR_WANT_WRITE)
2176                         wpa_printf(MSG_DEBUG, "SSL: SSL_accept - want to "
2177                                    "write");
2178                 else {
2179                         tls_show_errors(MSG_INFO, __func__, "SSL_accept");
2180                         return NULL;
2181                 }
2182         }
2183
2184         /* Get the TLS handshake data to be sent to the client */
2185         res = BIO_ctrl_pending(conn->ssl_out);
2186         wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
2187         out_data = os_malloc(res == 0 ? 1 : res);
2188         if (out_data == NULL) {
2189                 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
2190                            "handshake output (%d bytes)", res);
2191                 if (BIO_reset(conn->ssl_out) < 0) {
2192                         tls_show_errors(MSG_INFO, __func__,
2193                                         "BIO_reset failed");
2194                 }
2195                 *out_len = 0;
2196                 return NULL;
2197         }
2198         res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
2199         if (res < 0) {
2200                 tls_show_errors(MSG_INFO, __func__,
2201                                 "Handshake failed - BIO_read");
2202                 if (BIO_reset(conn->ssl_out) < 0) {
2203                         tls_show_errors(MSG_INFO, __func__,
2204                                         "BIO_reset failed");
2205                 }
2206                 *out_len = 0;
2207                 return NULL;
2208         }
2209         *out_len = res;
2210         return out_data;
2211 }
2212
2213
2214 int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
2215                            const u8 *in_data, size_t in_len,
2216                            u8 *out_data, size_t out_len)
2217 {
2218         int res;
2219
2220         if (conn == NULL)
2221                 return -1;
2222
2223         /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
2224         if ((res = BIO_reset(conn->ssl_in)) < 0 ||
2225             (res = BIO_reset(conn->ssl_out)) < 0) {
2226                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2227                 return res;
2228         }
2229         res = SSL_write(conn->ssl, in_data, in_len);
2230         if (res < 0) {
2231                 tls_show_errors(MSG_INFO, __func__,
2232                                 "Encryption failed - SSL_write");
2233                 return res;
2234         }
2235
2236         /* Read encrypted data to be sent to the server */
2237         res = BIO_read(conn->ssl_out, out_data, out_len);
2238         if (res < 0) {
2239                 tls_show_errors(MSG_INFO, __func__,
2240                                 "Encryption failed - BIO_read");
2241                 return res;
2242         }
2243
2244         return res;
2245 }
2246
2247
2248 int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
2249                            const u8 *in_data, size_t in_len,
2250                            u8 *out_data, size_t out_len)
2251 {
2252         int res;
2253
2254         /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
2255         res = BIO_write(conn->ssl_in, in_data, in_len);
2256         if (res < 0) {
2257                 tls_show_errors(MSG_INFO, __func__,
2258                                 "Decryption failed - BIO_write");
2259                 return res;
2260         }
2261         if (BIO_reset(conn->ssl_out) < 0) {
2262                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2263                 return res;
2264         }
2265
2266         /* Read decrypted data for further processing */
2267         res = SSL_read(conn->ssl, out_data, out_len);
2268         if (res < 0) {
2269                 tls_show_errors(MSG_INFO, __func__,
2270                                 "Decryption failed - SSL_read");
2271                 return res;
2272         }
2273
2274         return res;
2275 }
2276
2277
2278 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
2279 {
2280         return conn ? conn->ssl->hit : 0;
2281 }
2282
2283
2284 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
2285                                    u8 *ciphers)
2286 {
2287         char buf[100], *pos, *end;
2288         u8 *c;
2289         int ret;
2290
2291         if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
2292                 return -1;
2293
2294         buf[0] = '\0';
2295         pos = buf;
2296         end = pos + sizeof(buf);
2297
2298         c = ciphers;
2299         while (*c != TLS_CIPHER_NONE) {
2300                 const char *suite;
2301
2302                 switch (*c) {
2303                 case TLS_CIPHER_RC4_SHA:
2304                         suite = "RC4-SHA";
2305                         break;
2306                 case TLS_CIPHER_AES128_SHA:
2307                         suite = "AES128-SHA";
2308                         break;
2309                 case TLS_CIPHER_RSA_DHE_AES128_SHA:
2310                         suite = "DHE-RSA-AES128-SHA";
2311                         break;
2312                 case TLS_CIPHER_ANON_DH_AES128_SHA:
2313                         suite = "ADH-AES128-SHA";
2314                         break;
2315                 default:
2316                         wpa_printf(MSG_DEBUG, "TLS: Unsupported "
2317                                    "cipher selection: %d", *c);
2318                         return -1;
2319                 }
2320                 ret = os_snprintf(pos, end - pos, ":%s", suite);
2321                 if (ret < 0 || ret >= end - pos)
2322                         break;
2323                 pos += ret;
2324
2325                 c++;
2326         }
2327
2328         wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
2329
2330         if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
2331                 tls_show_errors(MSG_INFO, __func__,
2332                                 "Cipher suite configuration failed");
2333                 return -1;
2334         }
2335
2336         return 0;
2337 }
2338
2339
2340 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
2341                    char *buf, size_t buflen)
2342 {
2343         const char *name;
2344         if (conn == NULL || conn->ssl == NULL)
2345                 return -1;
2346
2347         name = SSL_get_cipher(conn->ssl);
2348         if (name == NULL)
2349                 return -1;
2350
2351         os_strlcpy(buf, name, buflen);
2352         return 0;
2353 }
2354
2355
2356 int tls_connection_enable_workaround(void *ssl_ctx,
2357                                      struct tls_connection *conn)
2358 {
2359         SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
2360
2361         return 0;
2362 }
2363
2364
2365 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2366 /* ClientHello TLS extensions require a patch to openssl, so this function is
2367  * commented out unless explicitly needed for EAP-FAST in order to be able to
2368  * build this file with unmodified openssl. */
2369 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
2370                                     int ext_type, const u8 *data,
2371                                     size_t data_len)
2372 {
2373         if (conn == NULL || conn->ssl == NULL || ext_type != 35)
2374                 return -1;
2375
2376 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2377         if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
2378                                        data_len) != 1)
2379                 return -1;
2380 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2381         if (SSL_set_hello_extension(conn->ssl, ext_type, (void *) data,
2382                                     data_len) != 1)
2383                 return -1;
2384 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2385
2386         return 0;
2387 }
2388 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2389
2390
2391 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
2392 {
2393         if (conn == NULL)
2394                 return -1;
2395         return conn->failed;
2396 }
2397
2398
2399 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
2400 {
2401         if (conn == NULL)
2402                 return -1;
2403         return conn->read_alerts;
2404 }
2405
2406
2407 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
2408 {
2409         if (conn == NULL)
2410                 return -1;
2411         return conn->write_alerts;
2412 }
2413
2414
2415 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
2416                               const struct tls_connection_params *params)
2417 {
2418         int ret;
2419         unsigned long err;
2420
2421         if (conn == NULL)
2422                 return -1;
2423
2424         while ((err = ERR_get_error())) {
2425                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2426                            __func__, ERR_error_string(err, NULL));
2427         }
2428
2429         if (params->engine) {
2430                 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
2431                 ret = tls_engine_init(conn, params->engine_id, params->pin,
2432                                       params->key_id, params->cert_id,
2433                                       params->ca_cert_id);
2434                 if (ret)
2435                         return ret;
2436         }
2437         if (tls_connection_set_subject_match(conn,
2438                                              params->subject_match,
2439                                              params->altsubject_match))
2440                 return -1;
2441
2442         if (params->engine && params->ca_cert_id) {
2443                 if (tls_connection_engine_ca_cert(tls_ctx, conn,
2444                                                   params->ca_cert_id))
2445                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2446         } else if (tls_connection_ca_cert(tls_ctx, conn, params->ca_cert,
2447                                           params->ca_cert_blob,
2448                                           params->ca_cert_blob_len,
2449                                           params->ca_path))
2450                 return -1;
2451
2452         if (params->engine && params->cert_id) {
2453                 if (tls_connection_engine_client_cert(conn, params->cert_id))
2454                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2455         } else if (tls_connection_client_cert(conn, params->client_cert,
2456                                               params->client_cert_blob,
2457                                               params->client_cert_blob_len))
2458                 return -1;
2459
2460         if (params->engine && params->key_id) {
2461                 wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
2462                 if (tls_connection_engine_private_key(conn))
2463                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2464         } else if (tls_connection_private_key(tls_ctx, conn,
2465                                               params->private_key,
2466                                               params->private_key_passwd,
2467                                               params->private_key_blob,
2468                                               params->private_key_blob_len)) {
2469                 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
2470                            params->private_key);
2471                 return -1;
2472         }
2473
2474         if (tls_connection_dh(conn, params->dh_file)) {
2475                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2476                            params->dh_file);
2477                 return -1;
2478         }
2479
2480         tls_get_errors(tls_ctx);
2481
2482         return 0;
2483 }
2484
2485
2486 int tls_global_set_params(void *tls_ctx,
2487                           const struct tls_connection_params *params)
2488 {
2489         SSL_CTX *ssl_ctx = tls_ctx;
2490         unsigned long err;
2491
2492         while ((err = ERR_get_error())) {
2493                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2494                            __func__, ERR_error_string(err, NULL));
2495         }
2496
2497         if (tls_global_ca_cert(ssl_ctx, params->ca_cert))
2498                 return -1;
2499
2500         if (tls_global_client_cert(ssl_ctx, params->client_cert))
2501                 return -1;
2502
2503         if (tls_global_private_key(ssl_ctx, params->private_key,
2504                                    params->private_key_passwd))
2505                 return -1;
2506
2507         if (tls_global_dh(ssl_ctx, params->dh_file)) {
2508                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2509                            params->dh_file);
2510                 return -1;
2511         }
2512
2513         return 0;
2514 }
2515
2516
2517 int tls_connection_get_keyblock_size(void *tls_ctx,
2518                                      struct tls_connection *conn)
2519 {
2520         const EVP_CIPHER *c;
2521         const EVP_MD *h;
2522
2523         if (conn == NULL || conn->ssl == NULL ||
2524             conn->ssl->enc_read_ctx == NULL ||
2525             conn->ssl->enc_read_ctx->cipher == NULL ||
2526             conn->ssl->read_hash == NULL)
2527                 return -1;
2528
2529         c = conn->ssl->enc_read_ctx->cipher;
2530 #if OPENSSL_VERSION_NUMBER >= 0x00909000L
2531         h = EVP_MD_CTX_md(conn->ssl->read_hash);
2532 #else
2533         h = conn->ssl->read_hash;
2534 #endif
2535
2536         return 2 * (EVP_CIPHER_key_length(c) +
2537                     EVP_MD_size(h) +
2538                     EVP_CIPHER_iv_length(c));
2539 }
2540
2541
2542 unsigned int tls_capabilities(void *tls_ctx)
2543 {
2544         return 0;
2545 }
2546
2547
2548 int tls_connection_set_ia(void *tls_ctx, struct tls_connection *conn,
2549                           int tls_ia)
2550 {
2551         return -1;
2552 }
2553
2554
2555 int tls_connection_ia_send_phase_finished(void *tls_ctx,
2556                                           struct tls_connection *conn,
2557                                           int final,
2558                                           u8 *out_data, size_t out_len)
2559 {
2560         return -1;
2561 }
2562
2563
2564 int tls_connection_ia_final_phase_finished(void *tls_ctx,
2565                                            struct tls_connection *conn)
2566 {
2567         return -1;
2568 }
2569
2570
2571 int tls_connection_ia_permute_inner_secret(void *tls_ctx,
2572                                            struct tls_connection *conn,
2573                                            const u8 *key, size_t key_len)
2574 {
2575         return -1;
2576 }
2577
2578
2579 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2580 /* Pre-shared secred requires a patch to openssl, so this function is
2581  * commented out unless explicitly needed for EAP-FAST in order to be able to
2582  * build this file with unmodified openssl. */
2583
2584 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
2585                            STACK_OF(SSL_CIPHER) *peer_ciphers,
2586                            SSL_CIPHER **cipher, void *arg)
2587 {
2588         struct tls_connection *conn = arg;
2589         int ret;
2590
2591         if (conn == NULL || conn->session_ticket_cb == NULL)
2592                 return 0;
2593
2594         ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
2595                                       conn->session_ticket,
2596                                       conn->session_ticket_len,
2597                                       s->s3->client_random,
2598                                       s->s3->server_random, secret);
2599         os_free(conn->session_ticket);
2600         conn->session_ticket = NULL;
2601
2602         if (ret <= 0)
2603                 return 0;
2604
2605         *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
2606         return 1;
2607 }
2608
2609
2610 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2611 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
2612                                      int len, void *arg)
2613 {
2614         struct tls_connection *conn = arg;
2615
2616         if (conn == NULL || conn->session_ticket_cb == NULL)
2617                 return 0;
2618
2619         wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
2620
2621         os_free(conn->session_ticket);
2622         conn->session_ticket = NULL;
2623
2624         wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2625                     "extension", data, len);
2626
2627         conn->session_ticket = os_malloc(len);
2628         if (conn->session_ticket == NULL)
2629                 return 0;
2630
2631         os_memcpy(conn->session_ticket, data, len);
2632         conn->session_ticket_len = len;
2633
2634         return 1;
2635 }
2636 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2637 #ifdef SSL_OP_NO_TICKET
2638 static void tls_hello_ext_cb(SSL *s, int client_server, int type,
2639                              unsigned char *data, int len, void *arg)
2640 {
2641         struct tls_connection *conn = arg;
2642
2643         if (conn == NULL || conn->session_ticket_cb == NULL)
2644                 return;
2645
2646         wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2647                    type, len);
2648
2649         if (type == TLSEXT_TYPE_session_ticket && !client_server) {
2650                 os_free(conn->session_ticket);
2651                 conn->session_ticket = NULL;
2652
2653                 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2654                             "extension", data, len);
2655                 conn->session_ticket = os_malloc(len);
2656                 if (conn->session_ticket == NULL)
2657                         return;
2658
2659                 os_memcpy(conn->session_ticket, data, len);
2660                 conn->session_ticket_len = len;
2661         }
2662 }
2663 #else /* SSL_OP_NO_TICKET */
2664 static int tls_hello_ext_cb(SSL *s, TLS_EXTENSION *ext, void *arg)
2665 {
2666         struct tls_connection *conn = arg;
2667
2668         if (conn == NULL || conn->session_ticket_cb == NULL)
2669                 return 0;
2670
2671         wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2672                    ext->type, ext->length);
2673
2674         os_free(conn->session_ticket);
2675         conn->session_ticket = NULL;
2676
2677         if (ext->type == 35) {
2678                 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2679                             "extension", ext->data, ext->length);
2680                 conn->session_ticket = os_malloc(ext->length);
2681                 if (conn->session_ticket == NULL)
2682                         return SSL_AD_INTERNAL_ERROR;
2683
2684                 os_memcpy(conn->session_ticket, ext->data, ext->length);
2685                 conn->session_ticket_len = ext->length;
2686         }
2687
2688         return 0;
2689 }
2690 #endif /* SSL_OP_NO_TICKET */
2691 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2692 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2693
2694
2695 int tls_connection_set_session_ticket_cb(void *tls_ctx,
2696                                          struct tls_connection *conn,
2697                                          tls_session_ticket_cb cb,
2698                                          void *ctx)
2699 {
2700 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2701         conn->session_ticket_cb = cb;
2702         conn->session_ticket_cb_ctx = ctx;
2703
2704         if (cb) {
2705                 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
2706                                               conn) != 1)
2707                         return -1;
2708 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2709                 SSL_set_session_ticket_ext_cb(conn->ssl,
2710                                               tls_session_ticket_ext_cb, conn);
2711 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2712 #ifdef SSL_OP_NO_TICKET
2713                 SSL_set_tlsext_debug_callback(conn->ssl, tls_hello_ext_cb);
2714                 SSL_set_tlsext_debug_arg(conn->ssl, conn);
2715 #else /* SSL_OP_NO_TICKET */
2716                 if (SSL_set_hello_extension_cb(conn->ssl, tls_hello_ext_cb,
2717                                                conn) != 1)
2718                         return -1;
2719 #endif /* SSL_OP_NO_TICKET */
2720 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2721         } else {
2722                 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
2723                         return -1;
2724 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2725                 SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
2726 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2727 #ifdef SSL_OP_NO_TICKET
2728                 SSL_set_tlsext_debug_callback(conn->ssl, NULL);
2729                 SSL_set_tlsext_debug_arg(conn->ssl, conn);
2730 #else /* SSL_OP_NO_TICKET */
2731                 if (SSL_set_hello_extension_cb(conn->ssl, NULL, NULL) != 1)
2732                         return -1;
2733 #endif /* SSL_OP_NO_TICKET */
2734 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2735         }
2736
2737         return 0;
2738 #else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2739         return -1;
2740 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2741 }