src/crypto/tls_openssl.c

   1 /*
   2  * WPA Supplicant / SSL/TLS interface functions for openssl
   3  * Copyright (c) 2004-2007, 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 static int tls_openssl_ref_count = 0;
  41
  42 struct tls_connection {
  43         SSL *ssl;
  44         BIO *ssl_in, *ssl_out;
  45 #ifndef OPENSSL_NO_ENGINE
  46         ENGINE *engine;        /* functional reference to the engine */
  47         EVP_PKEY *private_key; /* the private key if using engine */
  48 #endif /* OPENSSL_NO_ENGINE */
  49         char *subject_match, *altsubject_match;
  50         int read_alerts, write_alerts, failed;
  51
  52         tls_session_ticket_cb session_ticket_cb;
  53         void *session_ticket_cb_ctx;
  54
  55         /* SessionTicket received from OpenSSL hello_extension_cb (server) */
  56         u8 *session_ticket;
  57         size_t session_ticket_len;
  58 };
  59
  60
  61 #ifdef CONFIG_NO_STDOUT_DEBUG
  62
  63 static void _tls_show_errors(void)
  64 {
  65         unsigned long err;
  66
  67         while ((err = ERR_get_error())) {
  68                 /* Just ignore the errors, since stdout is disabled */
  69         }
  70 }
  71 #define tls_show_errors(l, f, t) _tls_show_errors()
  72
  73 #else /* CONFIG_NO_STDOUT_DEBUG */
  74
  75 static void tls_show_errors(int level, const char *func, const char *txt)
  76 {
  77         unsigned long err;
  78
  79         wpa_printf(level, "OpenSSL: %s - %s %s",
  80                    func, txt, ERR_error_string(ERR_get_error(), NULL));
  81
  82         while ((err = ERR_get_error())) {
  83                 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
  84                            ERR_error_string(err, NULL));
  85         }
  86 }
  87
  88 #endif /* CONFIG_NO_STDOUT_DEBUG */
  89
  90
  91 #ifdef CONFIG_NATIVE_WINDOWS
  92
  93 /* Windows CryptoAPI and access to certificate stores */
  94 #include <wincrypt.h>
  95
  96 #ifdef __MINGW32_VERSION
  97 /*
  98  * MinGW does not yet include all the needed definitions for CryptoAPI, so
  99  * define here whatever extra is needed.
 100  */
 101 #define CALG_SSL3_SHAMD5 (ALG_CLASS_HASH | ALG_TYPE_ANY | ALG_SID_SSL3SHAMD5)
 102 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
 103 #define CERT_STORE_READONLY_FLAG 0x00008000
 104 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
 105 #define CRYPT_ACQUIRE_COMPARE_KEY_FLAG 0x00000004
 106
 107 static BOOL WINAPI
 108 (*CryptAcquireCertificatePrivateKey)(PCCERT_CONTEXT pCert, DWORD dwFlags,
 109                                      void *pvReserved, HCRYPTPROV *phCryptProv,
 110                                      DWORD *pdwKeySpec, BOOL *pfCallerFreeProv)
 111 = NULL; /* to be loaded from crypt32.dll */
 112
 113 static PCCERT_CONTEXT WINAPI
 114 (*CertEnumCertificatesInStore)(HCERTSTORE hCertStore,
 115                                PCCERT_CONTEXT pPrevCertContext)
 116 = NULL; /* to be loaded from crypt32.dll */
 117
 118 static int mingw_load_crypto_func(void)
 119 {
 120         HINSTANCE dll;
 121
 122         /* MinGW does not yet have full CryptoAPI support, so load the needed
 123          * function here. */
 124
 125         if (CryptAcquireCertificatePrivateKey)
 126                 return 0;
 127
 128         dll = LoadLibrary("crypt32");
 129         if (dll == NULL) {
 130                 wpa_printf(MSG_DEBUG, "CryptoAPI: Could not load crypt32 "
 131                            "library");
 132                 return -1;
 133         }
 134
 135         CryptAcquireCertificatePrivateKey = GetProcAddress(
 136                 dll, "CryptAcquireCertificatePrivateKey");
 137         if (CryptAcquireCertificatePrivateKey == NULL) {
 138                 wpa_printf(MSG_DEBUG, "CryptoAPI: Could not get "
 139                            "CryptAcquireCertificatePrivateKey() address from "
 140                            "crypt32 library");
 141                 return -1;
 142         }
 143
 144         CertEnumCertificatesInStore = (void *) GetProcAddress(
 145                 dll, "CertEnumCertificatesInStore");
 146         if (CertEnumCertificatesInStore == NULL) {
 147                 wpa_printf(MSG_DEBUG, "CryptoAPI: Could not get "
 148                            "CertEnumCertificatesInStore() address from "
 149                            "crypt32 library");
 150                 return -1;
 151         }
 152
 153         return 0;
 154 }
 155
 156 #else /* __MINGW32_VERSION */
 157
 158 static int mingw_load_crypto_func(void)
 159 {
 160         return 0;
 161 }
 162
 163 #endif /* __MINGW32_VERSION */
 164
 165
 166 struct cryptoapi_rsa_data {
 167         const CERT_CONTEXT *cert;
 168         HCRYPTPROV crypt_prov;
 169         DWORD key_spec;
 170         BOOL free_crypt_prov;
 171 };
 172
 173
 174 static void cryptoapi_error(const char *msg)
 175 {
 176         wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
 177                    msg, (unsigned int) GetLastError());
 178 }
 179
 180
 181 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
 182                                  unsigned char *to, RSA *rsa, int padding)
 183 {
 184         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 185         return 0;
 186 }
 187
 188
 189 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
 190                                  unsigned char *to, RSA *rsa, int padding)
 191 {
 192         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 193         return 0;
 194 }
 195
 196
 197 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
 198                                   unsigned char *to, RSA *rsa, int padding)
 199 {
 200         struct cryptoapi_rsa_data *priv =
 201                 (struct cryptoapi_rsa_data *) rsa->meth->app_data;
 202         HCRYPTHASH hash;
 203         DWORD hash_size, len, i;
 204         unsigned char *buf = NULL;
 205         int ret = 0;
 206
 207         if (priv == NULL) {
 208                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 209                        ERR_R_PASSED_NULL_PARAMETER);
 210                 return 0;
 211         }
 212
 213         if (padding != RSA_PKCS1_PADDING) {
 214                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 215                        RSA_R_UNKNOWN_PADDING_TYPE);
 216                 return 0;
 217         }
 218
 219         if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
 220                 wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
 221                            __func__);
 222                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 223                        RSA_R_INVALID_MESSAGE_LENGTH);
 224                 return 0;
 225         }
 226
 227         if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
 228         {
 229                 cryptoapi_error("CryptCreateHash failed");
 230                 return 0;
 231         }
 232
 233         len = sizeof(hash_size);
 234         if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
 235                                0)) {
 236                 cryptoapi_error("CryptGetHashParam failed");
 237                 goto err;
 238         }
 239
 240         if ((int) hash_size != flen) {
 241                 wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
 242                            (unsigned) hash_size, flen);
 243                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 244                        RSA_R_INVALID_MESSAGE_LENGTH);
 245                 goto err;
 246         }
 247         if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
 248                 cryptoapi_error("CryptSetHashParam failed");
 249                 goto err;
 250         }
 251
 252         len = RSA_size(rsa);
 253         buf = os_malloc(len);
 254         if (buf == NULL) {
 255                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
 256                 goto err;
 257         }
 258
 259         if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
 260                 cryptoapi_error("CryptSignHash failed");
 261                 goto err;
 262         }
 263
 264         for (i = 0; i < len; i++)
 265                 to[i] = buf[len - i - 1];
 266         ret = len;
 267
 268 err:
 269         os_free(buf);
 270         CryptDestroyHash(hash);
 271
 272         return ret;
 273 }
 274
 275
 276 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
 277                                   unsigned char *to, RSA *rsa, int padding)
 278 {
 279         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 280         return 0;
 281 }
 282
 283
 284 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
 285 {
 286         if (priv == NULL)
 287                 return;
 288         if (priv->crypt_prov && priv->free_crypt_prov)
 289                 CryptReleaseContext(priv->crypt_prov, 0);
 290         if (priv->cert)
 291                 CertFreeCertificateContext(priv->cert);
 292         os_free(priv);
 293 }
 294
 295
 296 static int cryptoapi_finish(RSA *rsa)
 297 {
 298         cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
 299         os_free((void *) rsa->meth);
 300         rsa->meth = NULL;
 301         return 1;
 302 }
 303
 304
 305 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
 306 {
 307         HCERTSTORE cs;
 308         const CERT_CONTEXT *ret = NULL;
 309
 310         cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
 311                            store | CERT_STORE_OPEN_EXISTING_FLAG |
 312                            CERT_STORE_READONLY_FLAG, L"MY");
 313         if (cs == NULL) {
 314                 cryptoapi_error("Failed to open 'My system store'");
 315                 return NULL;
 316         }
 317
 318         if (strncmp(name, "cert://", 7) == 0) {
 319                 unsigned short wbuf[255];
 320                 MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
 321                 ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
 322                                                  PKCS_7_ASN_ENCODING,
 323                                                  0, CERT_FIND_SUBJECT_STR,
 324                                                  wbuf, NULL);
 325         } else if (strncmp(name, "hash://", 7) == 0) {
 326                 CRYPT_HASH_BLOB blob;
 327                 int len;
 328                 const char *hash = name + 7;
 329                 unsigned char *buf;
 330
 331                 len = os_strlen(hash) / 2;
 332                 buf = os_malloc(len);
 333                 if (buf && hexstr2bin(hash, buf, len) == 0) {
 334                         blob.cbData = len;
 335                         blob.pbData = buf;
 336                         ret = CertFindCertificateInStore(cs,
 337                                                          X509_ASN_ENCODING |
 338                                                          PKCS_7_ASN_ENCODING,
 339                                                          0, CERT_FIND_HASH,
 340                                                          &blob, NULL);
 341                 }
 342                 os_free(buf);
 343         }
 344
 345         CertCloseStore(cs, 0);
 346
 347         return ret;
 348 }
 349
 350
 351 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 352 {
 353         X509 *cert = NULL;
 354         RSA *rsa = NULL, *pub_rsa;
 355         struct cryptoapi_rsa_data *priv;
 356         RSA_METHOD *rsa_meth;
 357
 358         if (name == NULL ||
 359             (strncmp(name, "cert://", 7) != 0 &&
 360              strncmp(name, "hash://", 7) != 0))
 361                 return -1;
 362
 363         priv = os_zalloc(sizeof(*priv));
 364         rsa_meth = os_zalloc(sizeof(*rsa_meth));
 365         if (priv == NULL || rsa_meth == NULL) {
 366                 wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
 367                            "for CryptoAPI RSA method");
 368                 os_free(priv);
 369                 os_free(rsa_meth);
 370                 return -1;
 371         }
 372
 373         priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
 374         if (priv->cert == NULL) {
 375                 priv->cert = cryptoapi_find_cert(
 376                         name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
 377         }
 378         if (priv->cert == NULL) {
 379                 wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
 380                            "'%s'", name);
 381                 goto err;
 382         }
 383
 384         cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &priv->cert->pbCertEncoded,
 385                         priv->cert->cbCertEncoded);
 386         if (cert == NULL) {
 387                 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
 388                            "encoding");
 389                 goto err;
 390         }
 391
 392         if (mingw_load_crypto_func())
 393                 goto err;
 394
 395         if (!CryptAcquireCertificatePrivateKey(priv->cert,
 396                                                CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
 397                                                NULL, &priv->crypt_prov,
 398                                                &priv->key_spec,
 399                                                &priv->free_crypt_prov)) {
 400                 cryptoapi_error("Failed to acquire a private key for the "
 401                                 "certificate");
 402                 goto err;
 403         }
 404
 405         rsa_meth->name = "Microsoft CryptoAPI RSA Method";
 406         rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
 407         rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
 408         rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
 409         rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
 410         rsa_meth->finish = cryptoapi_finish;
 411         rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
 412         rsa_meth->app_data = (char *) priv;
 413
 414         rsa = RSA_new();
 415         if (rsa == NULL) {
 416                 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
 417                        ERR_R_MALLOC_FAILURE);
 418                 goto err;
 419         }
 420
 421         if (!SSL_use_certificate(ssl, cert)) {
 422                 RSA_free(rsa);
 423                 rsa = NULL;
 424                 goto err;
 425         }
 426         pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
 427         X509_free(cert);
 428         cert = NULL;
 429
 430         rsa->n = BN_dup(pub_rsa->n);
 431         rsa->e = BN_dup(pub_rsa->e);
 432         if (!RSA_set_method(rsa, rsa_meth))
 433                 goto err;
 434
 435         if (!SSL_use_RSAPrivateKey(ssl, rsa))
 436                 goto err;
 437         RSA_free(rsa);
 438
 439         return 0;
 440
 441 err:
 442         if (cert)
 443                 X509_free(cert);
 444         if (rsa)
 445                 RSA_free(rsa);
 446         else {
 447                 os_free(rsa_meth);
 448                 cryptoapi_free_data(priv);
 449         }
 450         return -1;
 451 }
 452
 453
 454 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
 455 {
 456         HCERTSTORE cs;
 457         PCCERT_CONTEXT ctx = NULL;
 458         X509 *cert;
 459         char buf[128];
 460         const char *store;
 461 #ifdef UNICODE
 462         WCHAR *wstore;
 463 #endif /* UNICODE */
 464
 465         if (mingw_load_crypto_func())
 466                 return -1;
 467
 468         if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
 469                 return -1;
 470
 471         store = name + 13;
 472 #ifdef UNICODE
 473         wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
 474         if (wstore == NULL)
 475                 return -1;
 476         wsprintf(wstore, L"%S", store);
 477         cs = CertOpenSystemStore(0, wstore);
 478         os_free(wstore);
 479 #else /* UNICODE */
 480         cs = CertOpenSystemStore(0, store);
 481 #endif /* UNICODE */
 482         if (cs == NULL) {
 483                 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
 484                            "'%s': error=%d", __func__, store,
 485                            (int) GetLastError());
 486                 return -1;
 487         }
 488
 489         while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
 490                 cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ctx->pbCertEncoded,
 491                                 ctx->cbCertEncoded);
 492                 if (cert == NULL) {
 493                         wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
 494                                    "X509 DER encoding for CA cert");
 495                         continue;
 496                 }
 497
 498                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
 499                                   sizeof(buf));
 500                 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
 501                            "system certificate store: subject='%s'", buf);
 502
 503                 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
 504                         tls_show_errors(MSG_WARNING, __func__,
 505                                         "Failed to add ca_cert to OpenSSL "
 506                                         "certificate store");
 507                 }
 508
 509                 X509_free(cert);
 510         }
 511
 512         if (!CertCloseStore(cs, 0)) {
 513                 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
 514                            "'%s': error=%d", __func__, name + 13,
 515                            (int) GetLastError());
 516         }
 517
 518         return 0;
 519 }
 520
 521
 522 #else /* CONFIG_NATIVE_WINDOWS */
 523
 524 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 525 {
 526         return -1;
 527 }
 528
 529 #endif /* CONFIG_NATIVE_WINDOWS */
 530
 531
 532 static void ssl_info_cb(const SSL *ssl, int where, int ret)
 533 {
 534         const char *str;
 535         int w;
 536
 537         wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
 538         w = where & ~SSL_ST_MASK;
 539         if (w & SSL_ST_CONNECT)
 540                 str = "SSL_connect";
 541         else if (w & SSL_ST_ACCEPT)
 542                 str = "SSL_accept";
 543         else
 544                 str = "undefined";
 545
 546         if (where & SSL_CB_LOOP) {
 547                 wpa_printf(MSG_DEBUG, "SSL: %s:%s",
 548                            str, SSL_state_string_long(ssl));
 549         } else if (where & SSL_CB_ALERT) {
 550                 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
 551                            where & SSL_CB_READ ?
 552                            "read (remote end reported an error)" :
 553                            "write (local SSL3 detected an error)",
 554                            SSL_alert_type_string_long(ret),
 555                            SSL_alert_desc_string_long(ret));
 556                 if ((ret >> 8) == SSL3_AL_FATAL) {
 557                         struct tls_connection *conn =
 558                                 SSL_get_app_data((SSL *) ssl);
 559                         if (where & SSL_CB_READ)
 560                                 conn->read_alerts++;
 561                         else
 562                                 conn->write_alerts++;
 563                 }
 564         } else if (where & SSL_CB_EXIT && ret <= 0) {
 565                 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
 566                            str, ret == 0 ? "failed" : "error",
 567                            SSL_state_string_long(ssl));
 568         }
 569 }
 570
 571
 572 #ifndef OPENSSL_NO_ENGINE
 573 /**
 574  * tls_engine_load_dynamic_generic - load any openssl engine
 575  * @pre: an array of commands and values that load an engine initialized
 576  *       in the engine specific function
 577  * @post: an array of commands and values that initialize an already loaded
 578  *        engine (or %NULL if not required)
 579  * @id: the engine id of the engine to load (only required if post is not %NULL
 580  *
 581  * This function is a generic function that loads any openssl engine.
 582  *
 583  * Returns: 0 on success, -1 on failure
 584  */
 585 static int tls_engine_load_dynamic_generic(const char *pre[],
 586                                            const char *post[], const char *id)
 587 {
 588         ENGINE *engine;
 589         const char *dynamic_id = "dynamic";
 590
 591         engine = ENGINE_by_id(id);
 592         if (engine) {
 593                 ENGINE_free(engine);
 594                 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
 595                            "available", id);
 596                 return 0;
 597         }
 598         ERR_clear_error();
 599
 600         engine = ENGINE_by_id(dynamic_id);
 601         if (engine == NULL) {
 602                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 603                            dynamic_id,
 604                            ERR_error_string(ERR_get_error(), NULL));
 605                 return -1;
 606         }
 607
 608         /* Perform the pre commands. This will load the engine. */
 609         while (pre && pre[0]) {
 610                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
 611                 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
 612                         wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
 613                                    "%s %s [%s]", pre[0], pre[1],
 614                                    ERR_error_string(ERR_get_error(), NULL));
 615                         ENGINE_free(engine);
 616                         return -1;
 617                 }
 618                 pre += 2;
 619         }
 620
 621         /*
 622          * Free the reference to the "dynamic" engine. The loaded engine can
 623          * now be looked up using ENGINE_by_id().
 624          */
 625         ENGINE_free(engine);
 626
 627         engine = ENGINE_by_id(id);
 628         if (engine == NULL) {
 629                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 630                            id, ERR_error_string(ERR_get_error(), NULL));
 631                 return -1;
 632         }
 633
 634         while (post && post[0]) {
 635                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
 636                 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
 637                         wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
 638                                 " %s %s [%s]", post[0], post[1],
 639                                    ERR_error_string(ERR_get_error(), NULL));
 640                         ENGINE_remove(engine);
 641                         ENGINE_free(engine);
 642                         return -1;
 643                 }
 644                 post += 2;
 645         }
 646         ENGINE_free(engine);
 647
 648         return 0;
 649 }
 650
 651
 652 /**
 653  * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
 654  * @pkcs11_so_path: pksc11_so_path from the configuration
 655  * @pcks11_module_path: pkcs11_module_path from the configuration
 656  */
 657 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
 658                                           const char *pkcs11_module_path)
 659 {
 660         char *engine_id = "pkcs11";
 661         const char *pre_cmd[] = {
 662                 "SO_PATH", NULL /* pkcs11_so_path */,
 663                 "ID", NULL /* engine_id */,
 664                 "LIST_ADD", "1",
 665                 /* "NO_VCHECK", "1", */
 666                 "LOAD", NULL,
 667                 NULL, NULL
 668         };
 669         const char *post_cmd[] = {
 670                 "MODULE_PATH", NULL /* pkcs11_module_path */,
 671                 NULL, NULL
 672         };
 673
 674         if (!pkcs11_so_path || !pkcs11_module_path)
 675                 return 0;
 676
 677         pre_cmd[1] = pkcs11_so_path;
 678         pre_cmd[3] = engine_id;
 679         post_cmd[1] = pkcs11_module_path;
 680
 681         wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
 682                    pkcs11_so_path);
 683
 684         return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
 685 }
 686
 687
 688 /**
 689  * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
 690  * @opensc_so_path: opensc_so_path from the configuration
 691  */
 692 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
 693 {
 694         char *engine_id = "opensc";
 695         const char *pre_cmd[] = {
 696                 "SO_PATH", NULL /* opensc_so_path */,
 697                 "ID", NULL /* engine_id */,
 698                 "LIST_ADD", "1",
 699                 "LOAD", NULL,
 700                 NULL, NULL
 701         };
 702
 703         if (!opensc_so_path)
 704                 return 0;
 705
 706         pre_cmd[1] = opensc_so_path;
 707         pre_cmd[3] = engine_id;
 708
 709         wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
 710                    opensc_so_path);
 711
 712         return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
 713 }
 714 #endif /* OPENSSL_NO_ENGINE */
 715
 716
 717 void * tls_init(const struct tls_config *conf)
 718 {
 719         SSL_CTX *ssl;
 720
 721         if (tls_openssl_ref_count == 0) {
 722                 SSL_load_error_strings();
 723                 SSL_library_init();
 724                 /* TODO: if /dev/urandom is available, PRNG is seeded
 725                  * automatically. If this is not the case, random data should
 726                  * be added here. */
 727
 728 #ifdef PKCS12_FUNCS
 729                 PKCS12_PBE_add();
 730 #endif  /* PKCS12_FUNCS */
 731         }
 732         tls_openssl_ref_count++;
 733
 734         ssl = SSL_CTX_new(TLSv1_method());
 735         if (ssl == NULL)
 736                 return NULL;
 737
 738         SSL_CTX_set_info_callback(ssl, ssl_info_cb);
 739
 740 #ifndef OPENSSL_NO_ENGINE
 741         if (conf &&
 742             (conf->opensc_engine_path || conf->pkcs11_engine_path ||
 743              conf->pkcs11_module_path)) {
 744                 wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
 745                 ERR_load_ENGINE_strings();
 746                 ENGINE_load_dynamic();
 747
 748                 if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
 749                     tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
 750                                                    conf->pkcs11_module_path)) {
 751                         tls_deinit(ssl);
 752                         return NULL;
 753                 }
 754         }
 755 #endif /* OPENSSL_NO_ENGINE */
 756
 757         return ssl;
 758 }
 759
 760
 761 void tls_deinit(void *ssl_ctx)
 762 {
 763         SSL_CTX *ssl = ssl_ctx;
 764         SSL_CTX_free(ssl);
 765
 766         tls_openssl_ref_count--;
 767         if (tls_openssl_ref_count == 0) {
 768 #ifndef OPENSSL_NO_ENGINE
 769                 ENGINE_cleanup();
 770 #endif /* OPENSSL_NO_ENGINE */
 771                 CRYPTO_cleanup_all_ex_data();
 772                 ERR_remove_state(0);
 773                 ERR_free_strings();
 774                 EVP_cleanup();
 775         }
 776 }
 777
 778
 779 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
 780                            const char *pin, const char *key_id)
 781 {
 782 #ifndef OPENSSL_NO_ENGINE
 783         int ret = -1;
 784         if (engine_id == NULL) {
 785                 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
 786                 return -1;
 787         }
 788         if (pin == NULL) {
 789                 wpa_printf(MSG_ERROR, "ENGINE: Smartcard PIN not set");
 790                 return -1;
 791         }
 792         if (key_id == NULL) {
 793                 wpa_printf(MSG_ERROR, "ENGINE: Key Id not set");
 794                 return -1;
 795         }
 796
 797         ERR_clear_error();
 798         conn->engine = ENGINE_by_id(engine_id);
 799         if (!conn->engine) {
 800                 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
 801                            engine_id, ERR_error_string(ERR_get_error(), NULL));
 802                 goto err;
 803         }
 804         if (ENGINE_init(conn->engine) != 1) {
 805                 wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
 806                            "(engine: %s) [%s]", engine_id,
 807                            ERR_error_string(ERR_get_error(), NULL));
 808                 goto err;
 809         }
 810         wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
 811
 812         if (ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
 813                 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
 814                            ERR_error_string(ERR_get_error(), NULL));
 815                 goto err;
 816         }
 817         conn->private_key = ENGINE_load_private_key(conn->engine,
 818                                                     key_id, NULL, NULL);
 819         if (!conn->private_key) {
 820                 wpa_printf(MSG_ERROR, "ENGINE: cannot load private key with id"
 821                                 " '%s' [%s]", key_id,
 822                            ERR_error_string(ERR_get_error(), NULL));
 823                 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
 824                 goto err;
 825         }
 826         return 0;
 827
 828 err:
 829         if (conn->engine) {
 830                 ENGINE_free(conn->engine);
 831                 conn->engine = NULL;
 832         }
 833
 834         if (conn->private_key) {
 835                 EVP_PKEY_free(conn->private_key);
 836                 conn->private_key = NULL;
 837         }
 838
 839         return ret;
 840 #else /* OPENSSL_NO_ENGINE */
 841         return 0;
 842 #endif /* OPENSSL_NO_ENGINE */
 843 }
 844
 845
 846 static void tls_engine_deinit(struct tls_connection *conn)
 847 {
 848 #ifndef OPENSSL_NO_ENGINE
 849         wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
 850         if (conn->private_key) {
 851                 EVP_PKEY_free(conn->private_key);
 852                 conn->private_key = NULL;
 853         }
 854         if (conn->engine) {
 855                 ENGINE_finish(conn->engine);
 856                 conn->engine = NULL;
 857         }
 858 #endif /* OPENSSL_NO_ENGINE */
 859 }
 860
 861
 862 int tls_get_errors(void *ssl_ctx)
 863 {
 864         int count = 0;
 865         unsigned long err;
 866
 867         while ((err = ERR_get_error())) {
 868                 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
 869                            ERR_error_string(err, NULL));
 870                 count++;
 871         }
 872
 873         return count;
 874 }
 875
 876 struct tls_connection * tls_connection_init(void *ssl_ctx)
 877 {
 878         SSL_CTX *ssl = ssl_ctx;
 879         struct tls_connection *conn;
 880         long options;
 881
 882         conn = os_zalloc(sizeof(*conn));
 883         if (conn == NULL)
 884                 return NULL;
 885         conn->ssl = SSL_new(ssl);
 886         if (conn->ssl == NULL) {
 887                 tls_show_errors(MSG_INFO, __func__,
 888                                 "Failed to initialize new SSL connection");
 889                 os_free(conn);
 890                 return NULL;
 891         }
 892
 893         SSL_set_app_data(conn->ssl, conn);
 894         options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
 895                 SSL_OP_SINGLE_DH_USE;
 896 #ifdef SSL_OP_NO_COMPRESSION
 897         options |= SSL_OP_NO_COMPRESSION;
 898 #endif /* SSL_OP_NO_COMPRESSION */
 899         SSL_set_options(conn->ssl, options);
 900
 901         conn->ssl_in = BIO_new(BIO_s_mem());
 902         if (!conn->ssl_in) {
 903                 tls_show_errors(MSG_INFO, __func__,
 904                                 "Failed to create a new BIO for ssl_in");
 905                 SSL_free(conn->ssl);
 906                 os_free(conn);
 907                 return NULL;
 908         }
 909
 910         conn->ssl_out = BIO_new(BIO_s_mem());
 911         if (!conn->ssl_out) {
 912                 tls_show_errors(MSG_INFO, __func__,
 913                                 "Failed to create a new BIO for ssl_out");
 914                 SSL_free(conn->ssl);
 915                 BIO_free(conn->ssl_in);
 916                 os_free(conn);
 917                 return NULL;
 918         }
 919
 920         SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
 921
 922         return conn;
 923 }
 924
 925
 926 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
 927 {
 928         if (conn == NULL)
 929                 return;
 930         SSL_free(conn->ssl);
 931         tls_engine_deinit(conn);
 932         os_free(conn->subject_match);
 933         os_free(conn->altsubject_match);
 934         os_free(conn->session_ticket);
 935         os_free(conn);
 936 }
 937
 938
 939 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
 940 {
 941         return conn ? SSL_is_init_finished(conn->ssl) : 0;
 942 }
 943
 944
 945 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
 946 {
 947         if (conn == NULL)
 948                 return -1;
 949
 950         /* Shutdown previous TLS connection without notifying the peer
 951          * because the connection was already terminated in practice
 952          * and "close notify" shutdown alert would confuse AS. */
 953         SSL_set_quiet_shutdown(conn->ssl, 1);
 954         SSL_shutdown(conn->ssl);
 955         return 0;
 956 }
 957
 958
 959 static int tls_match_altsubject_component(X509 *cert, int type,
 960                                           const char *value, size_t len)
 961 {
 962         GENERAL_NAME *gen;
 963         void *ext;
 964         int i, found = 0;
 965
 966         ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
 967
 968         for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
 969                 gen = sk_GENERAL_NAME_value(ext, i);
 970                 if (gen->type != type)
 971                         continue;
 972                 if (os_strlen((char *) gen->d.ia5->data) == len &&
 973                     os_memcmp(value, gen->d.ia5->data, len) == 0)
 974                         found++;
 975         }
 976
 977         return found;
 978 }
 979
 980
 981 static int tls_match_altsubject(X509 *cert, const char *match)
 982 {
 983         int type;
 984         const char *pos, *end;
 985         size_t len;
 986
 987         pos = match;
 988         do {
 989                 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
 990                         type = GEN_EMAIL;
 991                         pos += 6;
 992                 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
 993                         type = GEN_DNS;
 994                         pos += 4;
 995                 } else if (os_strncmp(pos, "URI:", 4) == 0) {
 996                         type = GEN_URI;
 997                         pos += 4;
 998                 } else {
 999                         wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1000                                    "match '%s'", pos);
1001                         return 0;
1002                 }
1003                 end = os_strchr(pos, ';');
1004                 while (end) {
1005                         if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1006                             os_strncmp(end + 1, "DNS:", 4) == 0 ||
1007                             os_strncmp(end + 1, "URI:", 4) == 0)
1008                                 break;
1009                         end = os_strchr(end + 1, ';');
1010                 }
1011                 if (end)
1012                         len = end - pos;
1013                 else
1014                         len = os_strlen(pos);
1015                 if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1016                         return 1;
1017                 pos = end + 1;
1018         } while (end);
1019
1020         return 0;
1021 }
1022
1023
1024 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
1025 {
1026         char buf[256];
1027         X509 *err_cert;
1028         int err, depth;
1029         SSL *ssl;
1030         struct tls_connection *conn;
1031         char *match, *altmatch;
1032
1033         err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
1034         err = X509_STORE_CTX_get_error(x509_ctx);
1035         depth = X509_STORE_CTX_get_error_depth(x509_ctx);
1036         ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
1037                                          SSL_get_ex_data_X509_STORE_CTX_idx());
1038         X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
1039
1040         conn = SSL_get_app_data(ssl);
1041         match = conn ? conn->subject_match : NULL;
1042         altmatch = conn ? conn->altsubject_match : NULL;
1043
1044         if (!preverify_ok) {
1045                 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
1046                            " error %d (%s) depth %d for '%s'", err,
1047                            X509_verify_cert_error_string(err), depth, buf);
1048         } else {
1049                 wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - "
1050                            "preverify_ok=%d err=%d (%s) depth=%d buf='%s'",
1051                            preverify_ok, err,
1052                            X509_verify_cert_error_string(err), depth, buf);
1053                 if (depth == 0 && match && os_strstr(buf, match) == NULL) {
1054                         wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
1055                                    "match with '%s'", buf, match);
1056                         preverify_ok = 0;
1057                 } else if (depth == 0 && altmatch &&
1058                            !tls_match_altsubject(err_cert, altmatch)) {
1059                         wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
1060                                    "'%s' not found", altmatch);
1061                         preverify_ok = 0;
1062                 }
1063         }
1064
1065         return preverify_ok;
1066 }
1067
1068
1069 #ifndef OPENSSL_NO_STDIO
1070 static int tls_load_ca_der(void *_ssl_ctx, const char *ca_cert)
1071 {
1072         SSL_CTX *ssl_ctx = _ssl_ctx;
1073         X509_LOOKUP *lookup;
1074         int ret = 0;
1075
1076         lookup = X509_STORE_add_lookup(ssl_ctx->cert_store,
1077                                        X509_LOOKUP_file());
1078         if (lookup == NULL) {
1079                 tls_show_errors(MSG_WARNING, __func__,
1080                                 "Failed add lookup for X509 store");
1081                 return -1;
1082         }
1083
1084         if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
1085                 unsigned long err = ERR_peek_error();
1086                 tls_show_errors(MSG_WARNING, __func__,
1087                                 "Failed load CA in DER format");
1088                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1089                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1090                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1091                                    "cert already in hash table error",
1092                                    __func__);
1093                 } else
1094                         ret = -1;
1095         }
1096
1097         return ret;
1098 }
1099 #endif /* OPENSSL_NO_STDIO */
1100
1101
1102 static int tls_connection_ca_cert(void *_ssl_ctx, struct tls_connection *conn,
1103                                   const char *ca_cert, const u8 *ca_cert_blob,
1104                                   size_t ca_cert_blob_len, const char *ca_path)
1105 {
1106         SSL_CTX *ssl_ctx = _ssl_ctx;
1107
1108         /*
1109          * Remove previously configured trusted CA certificates before adding
1110          * new ones.
1111          */
1112         X509_STORE_free(ssl_ctx->cert_store);
1113         ssl_ctx->cert_store = X509_STORE_new();
1114         if (ssl_ctx->cert_store == NULL) {
1115                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1116                            "certificate store", __func__);
1117                 return -1;
1118         }
1119
1120         if (ca_cert_blob) {
1121                 X509 *cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ca_cert_blob,
1122                                       ca_cert_blob_len);
1123                 if (cert == NULL) {
1124                         tls_show_errors(MSG_WARNING, __func__,
1125                                         "Failed to parse ca_cert_blob");
1126                         return -1;
1127                 }
1128
1129                 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
1130                         unsigned long err = ERR_peek_error();
1131                         tls_show_errors(MSG_WARNING, __func__,
1132                                         "Failed to add ca_cert_blob to "
1133                                         "certificate store");
1134                         if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1135                             ERR_GET_REASON(err) ==
1136                             X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1137                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1138                                            "cert already in hash table error",
1139                                            __func__);
1140                         } else {
1141                                 X509_free(cert);
1142                                 return -1;
1143                         }
1144                 }
1145                 X509_free(cert);
1146                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
1147                            "to certificate store", __func__);
1148                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1149                 return 0;
1150         }
1151
1152 #ifdef CONFIG_NATIVE_WINDOWS
1153         if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
1154             0) {
1155                 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
1156                            "system certificate store");
1157                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1158                 return 0;
1159         }
1160 #endif /* CONFIG_NATIVE_WINDOWS */
1161
1162         if (ca_cert || ca_path) {
1163 #ifndef OPENSSL_NO_STDIO
1164                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
1165                     1) {
1166                         tls_show_errors(MSG_WARNING, __func__,
1167                                         "Failed to load root certificates");
1168                         if (ca_cert &&
1169                             tls_load_ca_der(ssl_ctx, ca_cert) == 0) {
1170                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
1171                                            "DER format CA certificate",
1172                                            __func__);
1173                         } else
1174                                 return -1;
1175                 } else {
1176                         wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1177                                    "certificate(s) loaded");
1178                         tls_get_errors(ssl_ctx);
1179                 }
1180                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1181 #else /* OPENSSL_NO_STDIO */
1182                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1183                            __func__);
1184                 return -1;
1185 #endif /* OPENSSL_NO_STDIO */
1186         } else {
1187                 /* No ca_cert configured - do not try to verify server
1188                  * certificate */
1189                 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
1190         }
1191
1192         return 0;
1193 }
1194
1195
1196 static int tls_global_ca_cert(SSL_CTX *ssl_ctx, const char *ca_cert)
1197 {
1198         if (ca_cert) {
1199                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
1200                 {
1201                         tls_show_errors(MSG_WARNING, __func__,
1202                                         "Failed to load root certificates");
1203                         return -1;
1204                 }
1205
1206                 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1207                            "certificate(s) loaded");
1208
1209 #ifndef OPENSSL_NO_STDIO
1210                 /* Add the same CAs to the client certificate requests */
1211                 SSL_CTX_set_client_CA_list(ssl_ctx,
1212                                            SSL_load_client_CA_file(ca_cert));
1213 #endif /* OPENSSL_NO_STDIO */
1214         }
1215
1216         return 0;
1217 }
1218
1219
1220 int tls_global_set_verify(void *ssl_ctx, int check_crl)
1221 {
1222         int flags;
1223
1224         if (check_crl) {
1225                 X509_STORE *cs = SSL_CTX_get_cert_store(ssl_ctx);
1226                 if (cs == NULL) {
1227                         tls_show_errors(MSG_INFO, __func__, "Failed to get "
1228                                         "certificate store when enabling "
1229                                         "check_crl");
1230                         return -1;
1231                 }
1232                 flags = X509_V_FLAG_CRL_CHECK;
1233                 if (check_crl == 2)
1234                         flags |= X509_V_FLAG_CRL_CHECK_ALL;
1235                 X509_STORE_set_flags(cs, flags);
1236         }
1237         return 0;
1238 }
1239
1240
1241 static int tls_connection_set_subject_match(struct tls_connection *conn,
1242                                             const char *subject_match,
1243                                             const char *altsubject_match)
1244 {
1245         os_free(conn->subject_match);
1246         conn->subject_match = NULL;
1247         if (subject_match) {
1248                 conn->subject_match = os_strdup(subject_match);
1249                 if (conn->subject_match == NULL)
1250                         return -1;
1251         }
1252
1253         os_free(conn->altsubject_match);
1254         conn->altsubject_match = NULL;
1255         if (altsubject_match) {
1256                 conn->altsubject_match = os_strdup(altsubject_match);
1257                 if (conn->altsubject_match == NULL)
1258                         return -1;
1259         }
1260
1261         return 0;
1262 }
1263
1264
1265 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
1266                               int verify_peer)
1267 {
1268         if (conn == NULL)
1269                 return -1;
1270
1271         if (verify_peer) {
1272                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
1273                                SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
1274                                SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
1275         } else {
1276                 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
1277         }
1278
1279         SSL_set_accept_state(conn->ssl);
1280
1281         return 0;
1282 }
1283
1284
1285 static int tls_connection_client_cert(struct tls_connection *conn,
1286                                       const char *client_cert,
1287                                       const u8 *client_cert_blob,
1288                                       size_t client_cert_blob_len)
1289 {
1290         if (client_cert == NULL && client_cert_blob == NULL)
1291                 return 0;
1292
1293         if (client_cert_blob &&
1294             SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
1295                                      client_cert_blob_len) == 1) {
1296                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
1297                            "OK");
1298                 return 0;
1299         } else if (client_cert_blob) {
1300                 tls_show_errors(MSG_DEBUG, __func__,
1301                                 "SSL_use_certificate_ASN1 failed");
1302         }
1303
1304         if (client_cert == NULL)
1305                 return -1;
1306
1307 #ifndef OPENSSL_NO_STDIO
1308         if (SSL_use_certificate_file(conn->ssl, client_cert,
1309                                      SSL_FILETYPE_ASN1) == 1) {
1310                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
1311                            " --> OK");
1312                 return 0;
1313         } else {
1314                 tls_show_errors(MSG_DEBUG, __func__,
1315                                 "SSL_use_certificate_file (DER) failed");
1316         }
1317
1318         if (SSL_use_certificate_file(conn->ssl, client_cert,
1319                                      SSL_FILETYPE_PEM) == 1) {
1320                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
1321                            " --> OK");
1322                 return 0;
1323         } else {
1324                 tls_show_errors(MSG_DEBUG, __func__,
1325                                 "SSL_use_certificate_file (PEM) failed");
1326         }
1327 #else /* OPENSSL_NO_STDIO */
1328         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1329 #endif /* OPENSSL_NO_STDIO */
1330
1331         return -1;
1332 }
1333
1334
1335 static int tls_global_client_cert(SSL_CTX *ssl_ctx, const char *client_cert)
1336 {
1337 #ifndef OPENSSL_NO_STDIO
1338         if (client_cert == NULL)
1339                 return 0;
1340
1341         if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1342                                          SSL_FILETYPE_ASN1) != 1 &&
1343             SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1344                                          SSL_FILETYPE_PEM) != 1) {
1345                 tls_show_errors(MSG_INFO, __func__,
1346                                 "Failed to load client certificate");
1347                 return -1;
1348         }
1349         return 0;
1350 #else /* OPENSSL_NO_STDIO */
1351         if (client_cert == NULL)
1352                 return 0;
1353         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1354         return -1;
1355 #endif /* OPENSSL_NO_STDIO */
1356 }
1357
1358
1359 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
1360 {
1361         if (password == NULL) {
1362                 return 0;
1363         }
1364         os_strlcpy(buf, (char *) password, size);
1365         return os_strlen(buf);
1366 }
1367
1368
1369 #ifdef PKCS12_FUNCS
1370 static int tls_parse_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, PKCS12 *p12,
1371                             const char *passwd)
1372 {
1373         EVP_PKEY *pkey;
1374         X509 *cert;
1375         STACK_OF(X509) *certs;
1376         int res = 0;
1377         char buf[256];
1378
1379         pkey = NULL;
1380         cert = NULL;
1381         certs = NULL;
1382         if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
1383                 tls_show_errors(MSG_DEBUG, __func__,
1384                                 "Failed to parse PKCS12 file");
1385                 PKCS12_free(p12);
1386                 return -1;
1387         }
1388         wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
1389
1390         if (cert) {
1391                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
1392                                   sizeof(buf));
1393                 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
1394                            "subject='%s'", buf);
1395                 if (ssl) {
1396                         if (SSL_use_certificate(ssl, cert) != 1)
1397                                 res = -1;
1398                 } else {
1399                         if (SSL_CTX_use_certificate(ssl_ctx, cert) != 1)
1400                                 res = -1;
1401                 }
1402                 X509_free(cert);
1403         }
1404
1405         if (pkey) {
1406                 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
1407                 if (ssl) {
1408                         if (SSL_use_PrivateKey(ssl, pkey) != 1)
1409                                 res = -1;
1410                 } else {
1411                         if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1)
1412                                 res = -1;
1413                 }
1414                 EVP_PKEY_free(pkey);
1415         }
1416
1417         if (certs) {
1418                 while ((cert = sk_X509_pop(certs)) != NULL) {
1419                         X509_NAME_oneline(X509_get_subject_name(cert), buf,
1420                                           sizeof(buf));
1421                         wpa_printf(MSG_DEBUG, "TLS: additional certificate"
1422                                    " from PKCS12: subject='%s'", buf);
1423                         /*
1424                          * There is no SSL equivalent for the chain cert - so
1425                          * always add it to the context...
1426                          */
1427                         if (SSL_CTX_add_extra_chain_cert(ssl_ctx, cert) != 1) {
1428                                 res = -1;
1429                                 break;
1430                         }
1431                 }
1432                 sk_X509_free(certs);
1433         }
1434
1435         PKCS12_free(p12);
1436
1437         if (res < 0)
1438                 tls_get_errors(ssl_ctx);
1439
1440         return res;
1441 }
1442 #endif  /* PKCS12_FUNCS */
1443
1444
1445 static int tls_read_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, const char *private_key,
1446                            const char *passwd)
1447 {
1448 #ifdef PKCS12_FUNCS
1449         FILE *f;
1450         PKCS12 *p12;
1451
1452         f = fopen(private_key, "rb");
1453         if (f == NULL)
1454                 return -1;
1455
1456         p12 = d2i_PKCS12_fp(f, NULL);
1457         fclose(f);
1458
1459         if (p12 == NULL) {
1460                 tls_show_errors(MSG_INFO, __func__,
1461                                 "Failed to use PKCS#12 file");
1462                 return -1;
1463         }
1464
1465         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1466
1467 #else /* PKCS12_FUNCS */
1468         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
1469                    "p12/pfx files");
1470         return -1;
1471 #endif  /* PKCS12_FUNCS */
1472 }
1473
1474
1475 static int tls_read_pkcs12_blob(SSL_CTX *ssl_ctx, SSL *ssl,
1476                                 const u8 *blob, size_t len, const char *passwd)
1477 {
1478 #ifdef PKCS12_FUNCS
1479         PKCS12 *p12;
1480
1481         p12 = d2i_PKCS12(NULL, (OPENSSL_d2i_TYPE) &blob, len);
1482         if (p12 == NULL) {
1483                 tls_show_errors(MSG_INFO, __func__,
1484                                 "Failed to use PKCS#12 blob");
1485                 return -1;
1486         }
1487
1488         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1489
1490 #else /* PKCS12_FUNCS */
1491         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
1492                    "p12/pfx blobs");
1493         return -1;
1494 #endif  /* PKCS12_FUNCS */
1495 }
1496
1497
1498 static int tls_connection_engine_private_key(struct tls_connection *conn)
1499 {
1500 #ifndef OPENSSL_NO_ENGINE
1501         if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
1502                 tls_show_errors(MSG_ERROR, __func__,
1503                                 "ENGINE: cannot use private key for TLS");
1504                 return -1;
1505         }
1506         if (!SSL_check_private_key(conn->ssl)) {
1507                 tls_show_errors(MSG_INFO, __func__,
1508                                 "Private key failed verification");
1509                 return -1;
1510         }
1511         return 0;
1512 #else /* OPENSSL_NO_ENGINE */
1513         wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
1514                    "engine support was not compiled in");
1515         return -1;
1516 #endif /* OPENSSL_NO_ENGINE */
1517 }
1518
1519
1520 static int tls_connection_private_key(void *_ssl_ctx,
1521                                       struct tls_connection *conn,
1522                                       const char *private_key,
1523                                       const char *private_key_passwd,
1524                                       const u8 *private_key_blob,
1525                                       size_t private_key_blob_len)
1526 {
1527         SSL_CTX *ssl_ctx = _ssl_ctx;
1528         char *passwd;
1529         int ok;
1530
1531         if (private_key == NULL && private_key_blob == NULL)
1532                 return 0;
1533
1534         if (private_key_passwd) {
1535                 passwd = os_strdup(private_key_passwd);
1536                 if (passwd == NULL)
1537                         return -1;
1538         } else
1539                 passwd = NULL;
1540
1541         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
1542         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
1543
1544         ok = 0;
1545         while (private_key_blob) {
1546                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
1547                                             (u8 *) private_key_blob,
1548                                             private_key_blob_len) == 1) {
1549                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
1550                                    "ASN1(EVP_PKEY_RSA) --> OK");
1551                         ok = 1;
1552                         break;
1553                 } else {
1554                         tls_show_errors(MSG_DEBUG, __func__,
1555                                         "SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA)"
1556                                         " failed");
1557                 }
1558
1559                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
1560                                             (u8 *) private_key_blob,
1561                                             private_key_blob_len) == 1) {
1562                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
1563                                    "ASN1(EVP_PKEY_DSA) --> OK");
1564                         ok = 1;
1565                         break;
1566                 } else {
1567                         tls_show_errors(MSG_DEBUG, __func__,
1568                                         "SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA)"
1569                                         " failed");
1570                 }
1571
1572                 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
1573                                                (u8 *) private_key_blob,
1574                                                private_key_blob_len) == 1) {
1575                         wpa_printf(MSG_DEBUG, "OpenSSL: "
1576                                    "SSL_use_RSAPrivateKey_ASN1 --> OK");
1577                         ok = 1;
1578                         break;
1579                 } else {
1580                         tls_show_errors(MSG_DEBUG, __func__,
1581                                         "SSL_use_RSAPrivateKey_ASN1 failed");
1582                 }
1583
1584                 if (tls_read_pkcs12_blob(ssl_ctx, conn->ssl, private_key_blob,
1585                                          private_key_blob_len, passwd) == 0) {
1586                         wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
1587                                    "OK");
1588                         ok = 1;
1589                         break;
1590                 }
1591
1592                 break;
1593         }
1594
1595         while (!ok && private_key) {
1596 #ifndef OPENSSL_NO_STDIO
1597                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
1598                                             SSL_FILETYPE_ASN1) == 1) {
1599                         wpa_printf(MSG_DEBUG, "OpenSSL: "
1600                                    "SSL_use_PrivateKey_File (DER) --> OK");
1601                         ok = 1;
1602                         break;
1603                 } else {
1604                         tls_show_errors(MSG_DEBUG, __func__,
1605                                         "SSL_use_PrivateKey_File (DER) "
1606                                         "failed");
1607                 }
1608
1609                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
1610                                             SSL_FILETYPE_PEM) == 1) {
1611                         wpa_printf(MSG_DEBUG, "OpenSSL: "
1612                                    "SSL_use_PrivateKey_File (PEM) --> OK");
1613                         ok = 1;
1614                         break;
1615                 } else {
1616                         tls_show_errors(MSG_DEBUG, __func__,
1617                                         "SSL_use_PrivateKey_File (PEM) "
1618                                         "failed");
1619                 }
1620 #else /* OPENSSL_NO_STDIO */
1621                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1622                            __func__);
1623 #endif /* OPENSSL_NO_STDIO */
1624
1625                 if (tls_read_pkcs12(ssl_ctx, conn->ssl, private_key, passwd)
1626                     == 0) {
1627                         wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
1628                                    "--> OK");
1629                         ok = 1;
1630                         break;
1631                 }
1632
1633                 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
1634                         wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
1635                                    "access certificate store --> OK");
1636                         ok = 1;
1637                         break;
1638                 }
1639
1640                 break;
1641         }
1642
1643         if (!ok) {
1644                 wpa_printf(MSG_INFO, "OpenSSL: Failed to load private key");
1645                 os_free(passwd);
1646                 ERR_clear_error();
1647                 return -1;
1648         }
1649         ERR_clear_error();
1650         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
1651         os_free(passwd);
1652
1653         if (!SSL_check_private_key(conn->ssl)) {
1654                 tls_show_errors(MSG_INFO, __func__, "Private key failed "
1655                                 "verification");
1656                 return -1;
1657         }
1658
1659         wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
1660         return 0;
1661 }
1662
1663
1664 static int tls_global_private_key(SSL_CTX *ssl_ctx, const char *private_key,
1665                                   const char *private_key_passwd)
1666 {
1667         char *passwd;
1668
1669         if (private_key == NULL)
1670                 return 0;
1671
1672         if (private_key_passwd) {
1673                 passwd = os_strdup(private_key_passwd);
1674                 if (passwd == NULL)
1675                         return -1;
1676         } else
1677                 passwd = NULL;
1678
1679         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
1680         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
1681         if (
1682 #ifndef OPENSSL_NO_STDIO
1683             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
1684                                         SSL_FILETYPE_ASN1) != 1 &&
1685             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
1686                                         SSL_FILETYPE_PEM) != 1 &&
1687 #endif /* OPENSSL_NO_STDIO */
1688             tls_read_pkcs12(ssl_ctx, NULL, private_key, passwd)) {
1689                 tls_show_errors(MSG_INFO, __func__,
1690                                 "Failed to load private key");
1691                 os_free(passwd);
1692                 ERR_clear_error();
1693                 return -1;
1694         }
1695         os_free(passwd);
1696         ERR_clear_error();
1697         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
1698
1699         if (!SSL_CTX_check_private_key(ssl_ctx)) {
1700                 tls_show_errors(MSG_INFO, __func__,
1701                                 "Private key failed verification");
1702                 return -1;
1703         }
1704
1705         return 0;
1706 }
1707
1708
1709 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
1710 {
1711 #ifdef OPENSSL_NO_DH
1712         if (dh_file == NULL)
1713                 return 0;
1714         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
1715                    "dh_file specified");
1716         return -1;
1717 #else /* OPENSSL_NO_DH */
1718         DH *dh;
1719         BIO *bio;
1720
1721         /* TODO: add support for dh_blob */
1722         if (dh_file == NULL)
1723                 return 0;
1724         if (conn == NULL)
1725                 return -1;
1726
1727         bio = BIO_new_file(dh_file, "r");
1728         if (bio == NULL) {
1729                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
1730                            dh_file, ERR_error_string(ERR_get_error(), NULL));
1731                 return -1;
1732         }
1733         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
1734         BIO_free(bio);
1735 #ifndef OPENSSL_NO_DSA
1736         while (dh == NULL) {
1737                 DSA *dsa;
1738                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
1739                            " trying to parse as DSA params", dh_file,
1740                            ERR_error_string(ERR_get_error(), NULL));
1741                 bio = BIO_new_file(dh_file, "r");
1742                 if (bio == NULL)
1743                         break;
1744                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
1745                 BIO_free(bio);
1746                 if (!dsa) {
1747                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
1748                                    "'%s': %s", dh_file,
1749                                    ERR_error_string(ERR_get_error(), NULL));
1750                         break;
1751                 }
1752
1753                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
1754                 dh = DSA_dup_DH(dsa);
1755                 DSA_free(dsa);
1756                 if (dh == NULL) {
1757                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
1758                                    "params into DH params");
1759                         break;
1760                 }
1761                 break;
1762         }
1763 #endif /* !OPENSSL_NO_DSA */
1764         if (dh == NULL) {
1765                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
1766                            "'%s'", dh_file);
1767                 return -1;
1768         }
1769
1770         if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
1771                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
1772                            "%s", dh_file,
1773                            ERR_error_string(ERR_get_error(), NULL));
1774                 DH_free(dh);
1775                 return -1;
1776         }
1777         DH_free(dh);
1778         return 0;
1779 #endif /* OPENSSL_NO_DH */
1780 }
1781
1782
1783 static int tls_global_dh(SSL_CTX *ssl_ctx, const char *dh_file)
1784 {
1785 #ifdef OPENSSL_NO_DH
1786         if (dh_file == NULL)
1787                 return 0;
1788         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
1789                    "dh_file specified");
1790         return -1;
1791 #else /* OPENSSL_NO_DH */
1792         DH *dh;
1793         BIO *bio;
1794
1795         /* TODO: add support for dh_blob */
1796         if (dh_file == NULL)
1797                 return 0;
1798         if (ssl_ctx == NULL)
1799                 return -1;
1800
1801         bio = BIO_new_file(dh_file, "r");
1802         if (bio == NULL) {
1803                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
1804                            dh_file, ERR_error_string(ERR_get_error(), NULL));
1805                 return -1;
1806         }
1807         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
1808         BIO_free(bio);
1809 #ifndef OPENSSL_NO_DSA
1810         while (dh == NULL) {
1811                 DSA *dsa;
1812                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
1813                            " trying to parse as DSA params", dh_file,
1814                            ERR_error_string(ERR_get_error(), NULL));
1815                 bio = BIO_new_file(dh_file, "r");
1816                 if (bio == NULL)
1817                         break;
1818                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
1819                 BIO_free(bio);
1820                 if (!dsa) {
1821                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
1822                                    "'%s': %s", dh_file,
1823                                    ERR_error_string(ERR_get_error(), NULL));
1824                         break;
1825                 }
1826
1827                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
1828                 dh = DSA_dup_DH(dsa);
1829                 DSA_free(dsa);
1830                 if (dh == NULL) {
1831                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
1832                                    "params into DH params");
1833                         break;
1834                 }
1835                 break;
1836         }
1837 #endif /* !OPENSSL_NO_DSA */
1838         if (dh == NULL) {
1839                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
1840                            "'%s'", dh_file);
1841                 return -1;
1842         }
1843
1844         if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
1845                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
1846                            "%s", dh_file,
1847                            ERR_error_string(ERR_get_error(), NULL));
1848                 DH_free(dh);
1849                 return -1;
1850         }
1851         DH_free(dh);
1852         return 0;
1853 #endif /* OPENSSL_NO_DH */
1854 }
1855
1856
1857 int tls_connection_get_keys(void *ssl_ctx, struct tls_connection *conn,
1858                             struct tls_keys *keys)
1859 {
1860         SSL *ssl;
1861
1862         if (conn == NULL || keys == NULL)
1863                 return -1;
1864         ssl = conn->ssl;
1865         if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL)
1866                 return -1;
1867
1868         os_memset(keys, 0, sizeof(*keys));
1869         keys->master_key = ssl->session->master_key;
1870         keys->master_key_len = ssl->session->master_key_length;
1871         keys->client_random = ssl->s3->client_random;
1872         keys->client_random_len = SSL3_RANDOM_SIZE;
1873         keys->server_random = ssl->s3->server_random;
1874         keys->server_random_len = SSL3_RANDOM_SIZE;
1875
1876         return 0;
1877 }
1878
1879
1880 int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
1881                        const char *label, int server_random_first,
1882                        u8 *out, size_t out_len)
1883 {
1884         return -1;
1885 }
1886
1887
1888 u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
1889                               const u8 *in_data, size_t in_len,
1890                               size_t *out_len, u8 **appl_data,
1891                               size_t *appl_data_len)
1892 {
1893         int res;
1894         u8 *out_data;
1895
1896         if (appl_data)
1897                 *appl_data = NULL;
1898
1899         /*
1900          * Give TLS handshake data from the server (if available) to OpenSSL
1901          * for processing.
1902          */
1903         if (in_data &&
1904             BIO_write(conn->ssl_in, in_data, in_len) < 0) {
1905                 tls_show_errors(MSG_INFO, __func__,
1906                                 "Handshake failed - BIO_write");
1907                 return NULL;
1908         }
1909
1910         /* Initiate TLS handshake or continue the existing handshake */
1911         res = SSL_connect(conn->ssl);
1912         if (res != 1) {
1913                 int err = SSL_get_error(conn->ssl, res);
1914                 if (err == SSL_ERROR_WANT_READ)
1915                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
1916                                    "more data");
1917                 else if (err == SSL_ERROR_WANT_WRITE)
1918                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
1919                                    "write");
1920                 else {
1921                         tls_show_errors(MSG_INFO, __func__, "SSL_connect");
1922                         conn->failed++;
1923                 }
1924         }
1925
1926         /* Get the TLS handshake data to be sent to the server */
1927         res = BIO_ctrl_pending(conn->ssl_out);
1928         wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
1929         out_data = os_malloc(res == 0 ? 1 : res);
1930         if (out_data == NULL) {
1931                 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
1932                            "handshake output (%d bytes)", res);
1933                 if (BIO_reset(conn->ssl_out) < 0) {
1934                         tls_show_errors(MSG_INFO, __func__,
1935                                         "BIO_reset failed");
1936                 }
1937                 *out_len = 0;
1938                 return NULL;
1939         }
1940         res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
1941         if (res < 0) {
1942                 tls_show_errors(MSG_INFO, __func__,
1943                                 "Handshake failed - BIO_read");
1944                 if (BIO_reset(conn->ssl_out) < 0) {
1945                         tls_show_errors(MSG_INFO, __func__,
1946                                         "BIO_reset failed");
1947                 }
1948                 *out_len = 0;
1949                 return NULL;
1950         }
1951         *out_len = res;
1952
1953         if (SSL_is_init_finished(conn->ssl) && appl_data) {
1954                 *appl_data = os_malloc(in_len);
1955                 if (*appl_data) {
1956                         res = SSL_read(conn->ssl, *appl_data, in_len);
1957                         if (res < 0) {
1958                                 tls_show_errors(MSG_INFO, __func__,
1959                                                 "Failed to read possible "
1960                                                 "Application Data");
1961                                 os_free(*appl_data);
1962                                 *appl_data = NULL;
1963                         } else {
1964                                 *appl_data_len = res;
1965                                 wpa_hexdump_key(MSG_MSGDUMP, "SSL: Application"
1966                                                 " Data in Finish message",
1967                                                 *appl_data, *appl_data_len);
1968                         }
1969                 }
1970         }
1971
1972         return out_data;
1973 }
1974
1975
1976 u8 * tls_connection_server_handshake(void *ssl_ctx,
1977                                      struct tls_connection *conn,
1978                                      const u8 *in_data, size_t in_len,
1979                                      size_t *out_len)
1980 {
1981         int res;
1982         u8 *out_data;
1983         char buf[10];
1984
1985         if (in_data &&
1986             BIO_write(conn->ssl_in, in_data, in_len) < 0) {
1987                 tls_show_errors(MSG_INFO, __func__,
1988                                 "Handshake failed - BIO_write");
1989                 return NULL;
1990         }
1991
1992         res = SSL_read(conn->ssl, buf, sizeof(buf));
1993         if (res >= 0) {
1994                 wpa_printf(MSG_DEBUG, "SSL: Unexpected data from SSL_read "
1995                            "(res=%d)", res);
1996         }
1997
1998         res = BIO_ctrl_pending(conn->ssl_out);
1999         wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
2000         out_data = os_malloc(res == 0 ? 1 : res);
2001         if (out_data == NULL) {
2002                 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
2003                            "handshake output (%d bytes)", res);
2004                 if (BIO_reset(conn->ssl_out) < 0) {
2005                         tls_show_errors(MSG_INFO, __func__,
2006                                         "BIO_reset failed");
2007                 }
2008                 *out_len = 0;
2009                 return NULL;
2010         }
2011         res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
2012         if (res < 0) {
2013                 tls_show_errors(MSG_INFO, __func__,
2014                                 "Handshake failed - BIO_read");
2015                 if (BIO_reset(conn->ssl_out) < 0) {
2016                         tls_show_errors(MSG_INFO, __func__,
2017                                         "BIO_reset failed");
2018                 }
2019                 *out_len = 0;
2020                 return NULL;
2021         }
2022         *out_len = res;
2023         return out_data;
2024 }
2025
2026
2027 int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
2028                            const u8 *in_data, size_t in_len,
2029                            u8 *out_data, size_t out_len)
2030 {
2031         int res;
2032
2033         if (conn == NULL)
2034                 return -1;
2035
2036         /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
2037         if ((res = BIO_reset(conn->ssl_in)) < 0 ||
2038             (res = BIO_reset(conn->ssl_out)) < 0) {
2039                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2040                 return res;
2041         }
2042         res = SSL_write(conn->ssl, in_data, in_len);
2043         if (res < 0) {
2044                 tls_show_errors(MSG_INFO, __func__,
2045                                 "Encryption failed - SSL_write");
2046                 return res;
2047         }
2048
2049         /* Read encrypted data to be sent to the server */
2050         res = BIO_read(conn->ssl_out, out_data, out_len);
2051         if (res < 0) {
2052                 tls_show_errors(MSG_INFO, __func__,
2053                                 "Encryption failed - BIO_read");
2054                 return res;
2055         }
2056
2057         return res;
2058 }
2059
2060
2061 int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
2062                            const u8 *in_data, size_t in_len,
2063                            u8 *out_data, size_t out_len)
2064 {
2065         int res;
2066
2067         /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
2068         res = BIO_write(conn->ssl_in, in_data, in_len);
2069         if (res < 0) {
2070                 tls_show_errors(MSG_INFO, __func__,
2071                                 "Decryption failed - BIO_write");
2072                 return res;
2073         }
2074         if (BIO_reset(conn->ssl_out) < 0) {
2075                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2076                 return res;
2077         }
2078
2079         /* Read decrypted data for further processing */
2080         res = SSL_read(conn->ssl, out_data, out_len);
2081         if (res < 0) {
2082                 tls_show_errors(MSG_INFO, __func__,
2083                                 "Decryption failed - SSL_read");
2084                 return res;
2085         }
2086
2087         return res;
2088 }
2089
2090
2091 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
2092 {
2093         return conn ? conn->ssl->hit : 0;
2094 }
2095
2096
2097 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
2098                                    u8 *ciphers)
2099 {
2100         char buf[100], *pos, *end;
2101         u8 *c;
2102         int ret;
2103
2104         if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
2105                 return -1;
2106
2107         buf[0] = '\0';
2108         pos = buf;
2109         end = pos + sizeof(buf);
2110
2111         c = ciphers;
2112         while (*c != TLS_CIPHER_NONE) {
2113                 const char *suite;
2114
2115                 switch (*c) {
2116                 case TLS_CIPHER_RC4_SHA:
2117                         suite = "RC4-SHA";
2118                         break;
2119                 case TLS_CIPHER_AES128_SHA:
2120                         suite = "AES128-SHA";
2121                         break;
2122                 case TLS_CIPHER_RSA_DHE_AES128_SHA:
2123                         suite = "DHE-RSA-AES128-SHA";
2124                         break;
2125                 case TLS_CIPHER_ANON_DH_AES128_SHA:
2126                         suite = "ADH-AES128-SHA";
2127                         break;
2128                 default:
2129                         wpa_printf(MSG_DEBUG, "TLS: Unsupported "
2130                                    "cipher selection: %d", *c);
2131                         return -1;
2132                 }
2133                 ret = os_snprintf(pos, end - pos, ":%s", suite);
2134                 if (ret < 0 || ret >= end - pos)
2135                         break;
2136                 pos += ret;
2137
2138                 c++;
2139         }
2140
2141         wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
2142
2143         if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
2144                 tls_show_errors(MSG_INFO, __func__,
2145                                 "Cipher suite configuration failed");
2146                 return -1;
2147         }
2148
2149         return 0;
2150 }
2151
2152
2153 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
2154                    char *buf, size_t buflen)
2155 {
2156         const char *name;
2157         if (conn == NULL || conn->ssl == NULL)
2158                 return -1;
2159
2160         name = SSL_get_cipher(conn->ssl);
2161         if (name == NULL)
2162                 return -1;
2163
2164         os_strlcpy(buf, name, buflen);
2165         return 0;
2166 }
2167
2168
2169 int tls_connection_enable_workaround(void *ssl_ctx,
2170                                      struct tls_connection *conn)
2171 {
2172         SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
2173
2174         return 0;
2175 }
2176
2177
2178 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC)
2179 /* ClientHello TLS extensions require a patch to openssl, so this function is
2180  * commented out unless explicitly needed for EAP-FAST in order to be able to
2181  * build this file with unmodified openssl. */
2182 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
2183                                     int ext_type, const u8 *data,
2184                                     size_t data_len)
2185 {
2186         if (conn == NULL || conn->ssl == NULL)
2187                 return -1;
2188
2189         if (SSL_set_hello_extension(conn->ssl, ext_type, (void *) data,
2190                                     data_len) != 1)
2191                 return -1;
2192
2193         return 0;
2194 }
2195 #endif /* EAP_FAST || EAP_FAST_DYNAMIC */
2196
2197
2198 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
2199 {
2200         if (conn == NULL)
2201                 return -1;
2202         return conn->failed;
2203 }
2204
2205
2206 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
2207 {
2208         if (conn == NULL)
2209                 return -1;
2210         return conn->read_alerts;
2211 }
2212
2213
2214 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
2215 {
2216         if (conn == NULL)
2217                 return -1;
2218         return conn->write_alerts;
2219 }
2220
2221
2222 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
2223                               const struct tls_connection_params *params)
2224 {
2225         int ret;
2226         unsigned long err;
2227
2228         if (conn == NULL)
2229                 return -1;
2230
2231         while ((err = ERR_get_error())) {
2232                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2233                            __func__, ERR_error_string(err, NULL));
2234         }
2235
2236         if (tls_connection_set_subject_match(conn,
2237                                              params->subject_match,
2238                                              params->altsubject_match))
2239                 return -1;
2240         if (tls_connection_ca_cert(tls_ctx, conn, params->ca_cert,
2241                                    params->ca_cert_blob,
2242                                    params->ca_cert_blob_len,
2243                                    params->ca_path))
2244                 return -1;
2245         if (tls_connection_client_cert(conn, params->client_cert,
2246                                        params->client_cert_blob,
2247                                        params->client_cert_blob_len))
2248                 return -1;
2249
2250         if (params->engine) {
2251                 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
2252                 ret = tls_engine_init(conn, params->engine_id, params->pin,
2253                                       params->key_id);
2254                 if (ret)
2255                         return ret;
2256                 if (tls_connection_engine_private_key(conn))
2257                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2258         } else if (tls_connection_private_key(tls_ctx, conn,
2259                                               params->private_key,
2260                                               params->private_key_passwd,
2261                                               params->private_key_blob,
2262                                               params->private_key_blob_len)) {
2263                 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
2264                            params->private_key);
2265                 return -1;
2266         }
2267
2268         if (tls_connection_dh(conn, params->dh_file)) {
2269                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2270                            params->dh_file);
2271                 return -1;
2272         }
2273
2274         tls_get_errors(tls_ctx);
2275
2276         return 0;
2277 }
2278
2279
2280 int tls_global_set_params(void *tls_ctx,
2281                           const struct tls_connection_params *params)
2282 {
2283         SSL_CTX *ssl_ctx = tls_ctx;
2284         unsigned long err;
2285
2286         while ((err = ERR_get_error())) {
2287                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2288                            __func__, ERR_error_string(err, NULL));
2289         }
2290
2291         if (tls_global_ca_cert(ssl_ctx, params->ca_cert))
2292                 return -1;
2293
2294         if (tls_global_client_cert(ssl_ctx, params->client_cert))
2295                 return -1;
2296
2297         if (tls_global_private_key(ssl_ctx, params->private_key,
2298                                    params->private_key_passwd))
2299                 return -1;
2300
2301         if (tls_global_dh(ssl_ctx, params->dh_file)) {
2302                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2303                            params->dh_file);
2304                 return -1;
2305         }
2306
2307         return 0;
2308 }
2309
2310
2311 int tls_connection_get_keyblock_size(void *tls_ctx,
2312                                      struct tls_connection *conn)
2313 {
2314         const EVP_CIPHER *c;
2315         const EVP_MD *h;
2316
2317         if (conn == NULL || conn->ssl == NULL ||
2318             conn->ssl->enc_read_ctx == NULL ||
2319             conn->ssl->enc_read_ctx->cipher == NULL ||
2320             conn->ssl->read_hash == NULL)
2321                 return -1;
2322
2323         c = conn->ssl->enc_read_ctx->cipher;
2324 #if OPENSSL_VERSION_NUMBER >= 0x00909000L
2325         h = EVP_MD_CTX_md(conn->ssl->read_hash);
2326 #else
2327         h = conn->ssl->read_hash;
2328 #endif
2329
2330         return 2 * (EVP_CIPHER_key_length(c) +
2331                     EVP_MD_size(h) +
2332                     EVP_CIPHER_iv_length(c));
2333 }
2334
2335
2336 unsigned int tls_capabilities(void *tls_ctx)
2337 {
2338         return 0;
2339 }
2340
2341
2342 int tls_connection_set_ia(void *tls_ctx, struct tls_connection *conn,
2343                           int tls_ia)
2344 {
2345         return -1;
2346 }
2347
2348
2349 int tls_connection_ia_send_phase_finished(void *tls_ctx,
2350                                           struct tls_connection *conn,
2351                                           int final,
2352                                           u8 *out_data, size_t out_len)
2353 {
2354         return -1;
2355 }
2356
2357
2358 int tls_connection_ia_final_phase_finished(void *tls_ctx,
2359                                            struct tls_connection *conn)
2360 {
2361         return -1;
2362 }
2363
2364
2365 int tls_connection_ia_permute_inner_secret(void *tls_ctx,
2366                                            struct tls_connection *conn,
2367                                            const u8 *key, size_t key_len)
2368 {
2369         return -1;
2370 }
2371
2372
2373 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC)
2374 /* Pre-shared secred requires a patch to openssl, so this function is
2375  * commented out unless explicitly needed for EAP-FAST in order to be able to
2376  * build this file with unmodified openssl. */
2377
2378 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
2379                            STACK_OF(SSL_CIPHER) *peer_ciphers,
2380                            SSL_CIPHER **cipher, void *arg)
2381 {
2382         struct tls_connection *conn = arg;
2383         int ret;
2384
2385         if (conn == NULL || conn->session_ticket_cb == NULL)
2386                 return 0;
2387
2388         ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
2389                                       conn->session_ticket,
2390                                       conn->session_ticket_len,
2391                                       s->s3->client_random,
2392                                       s->s3->server_random, secret);
2393         os_free(conn->session_ticket);
2394         conn->session_ticket = NULL;
2395
2396         if (ret <= 0)
2397                 return 0;
2398
2399         *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
2400         return 1;
2401 }
2402
2403
2404 #ifdef SSL_OP_NO_TICKET
2405 static void tls_hello_ext_cb(SSL *s, int client_server, int type,
2406                              unsigned char *data, int len, void *arg)
2407 {
2408         struct tls_connection *conn = arg;
2409
2410         if (conn == NULL || conn->session_ticket_cb == NULL)
2411                 return;
2412
2413         wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2414                    type, len);
2415
2416         if (type == TLSEXT_TYPE_session_ticket && !client_server) {
2417                 os_free(conn->session_ticket);
2418                 conn->session_ticket = NULL;
2419
2420                 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2421                             "extension", data, len);
2422                 conn->session_ticket = os_malloc(len);
2423                 if (conn->session_ticket == NULL)
2424                         return;
2425
2426                 os_memcpy(conn->session_ticket, data, len);
2427                 conn->session_ticket_len = len;
2428         }
2429 }
2430 #else /* SSL_OP_NO_TICKET */
2431 static int tls_hello_ext_cb(SSL *s, TLS_EXTENSION *ext, void *arg)
2432 {
2433         struct tls_connection *conn = arg;
2434
2435         if (conn == NULL || conn->session_ticket_cb == NULL)
2436                 return 0;
2437
2438         wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2439                    ext->type, ext->length);
2440
2441         os_free(conn->session_ticket);
2442         conn->session_ticket = NULL;
2443
2444         if (ext->type == 35) {
2445                 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2446                             "extension", ext->data, ext->length);
2447                 conn->session_ticket = os_malloc(ext->length);
2448                 if (conn->session_ticket == NULL)
2449                         return SSL_AD_INTERNAL_ERROR;
2450
2451                 os_memcpy(conn->session_ticket, ext->data, ext->length);
2452                 conn->session_ticket_len = ext->length;
2453         }
2454
2455         return 0;
2456 }
2457 #endif /* SSL_OP_NO_TICKET */
2458 #endif /* EAP_FAST || EAP_FAST_DYNAMIC */
2459
2460
2461 int tls_connection_set_session_ticket_cb(void *tls_ctx,
2462                                          struct tls_connection *conn,
2463                                          tls_session_ticket_cb cb,
2464                                          void *ctx)
2465 {
2466 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC)
2467         conn->session_ticket_cb = cb;
2468         conn->session_ticket_cb_ctx = ctx;
2469
2470         if (cb) {
2471                 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
2472                                               conn) != 1)
2473                         return -1;
2474 #ifdef SSL_OP_NO_TICKET
2475                 SSL_set_tlsext_debug_callback(conn->ssl, tls_hello_ext_cb);
2476                 SSL_set_tlsext_debug_arg(conn->ssl, conn);
2477 #else /* SSL_OP_NO_TICKET */
2478                 if (SSL_set_hello_extension_cb(conn->ssl, tls_hello_ext_cb,
2479                                                conn) != 1)
2480                         return -1;
2481 #endif /* SSL_OP_NO_TICKET */
2482         } else {
2483                 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
2484                         return -1;
2485 #ifdef SSL_OP_NO_TICKET
2486                 SSL_set_tlsext_debug_callback(conn->ssl, NULL);
2487                 SSL_set_tlsext_debug_arg(conn->ssl, conn);
2488 #else /* SSL_OP_NO_TICKET */
2489                 if (SSL_set_hello_extension_cb(conn->ssl, NULL, NULL) != 1)
2490                         return -1;
2491 #endif /* SSL_OP_NO_TICKET */
2492         }
2493
2494         return 0;
2495 #else /* EAP_FAST || EAP_FAST_DYNAMIC */
2496         return -1;
2497 #endif /* EAP_FAST || EAP_FAST_DYNAMIC */
2498 }