src/crypto/tls_openssl.c

   1 /*
   2  * SSL/TLS interface functions for OpenSSL
   3  * Copyright (c) 2004-2011, 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 #ifdef ANDROID
  32 #include <openssl/pem.h>
  33 #include "keystore_get.h"
  34 #endif /* ANDROID */
  35
  36 #include "common.h"
  37 #include "crypto.h"
  38 #include "tls.h"
  39
  40 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
  41 #define OPENSSL_d2i_TYPE const unsigned char **
  42 #else
  43 #define OPENSSL_d2i_TYPE unsigned char **
  44 #endif
  45
  46 #ifdef SSL_F_SSL_SET_SESSION_TICKET_EXT
  47 #ifdef SSL_OP_NO_TICKET
  48 /*
  49  * Session ticket override patch was merged into OpenSSL 0.9.9 tree on
  50  * 2008-11-15. This version uses a bit different API compared to the old patch.
  51  */
  52 #define CONFIG_OPENSSL_TICKET_OVERRIDE
  53 #endif
  54 #endif
  55
  56 static int tls_openssl_ref_count = 0;
  57
  58 struct tls_global {
  59         void (*event_cb)(void *ctx, enum tls_event ev,
  60                          union tls_event_data *data);
  61         void *cb_ctx;
  62         int cert_in_cb;
  63 };
  64
  65 static struct tls_global *tls_global = NULL;
  66
  67
  68 struct tls_connection {
  69         SSL *ssl;
  70         BIO *ssl_in, *ssl_out;
  71 #ifndef OPENSSL_NO_ENGINE
  72         ENGINE *engine;        /* functional reference to the engine */
  73         EVP_PKEY *private_key; /* the private key if using engine */
  74 #endif /* OPENSSL_NO_ENGINE */
  75         char *subject_match, *altsubject_match;
  76         int read_alerts, write_alerts, failed;
  77
  78         tls_session_ticket_cb session_ticket_cb;
  79         void *session_ticket_cb_ctx;
  80
  81         /* SessionTicket received from OpenSSL hello_extension_cb (server) */
  82         u8 *session_ticket;
  83         size_t session_ticket_len;
  84
  85         unsigned int ca_cert_verify:1;
  86         unsigned int cert_probe:1;
  87         unsigned int server_cert_only:1;
  88
  89         u8 srv_cert_hash[32];
  90
  91         unsigned int flags;
  92 };
  93
  94
  95 #ifdef CONFIG_NO_STDOUT_DEBUG
  96
  97 static void _tls_show_errors(void)
  98 {
  99         unsigned long err;
 100
 101         while ((err = ERR_get_error())) {
 102                 /* Just ignore the errors, since stdout is disabled */
 103         }
 104 }
 105 #define tls_show_errors(l, f, t) _tls_show_errors()
 106
 107 #else /* CONFIG_NO_STDOUT_DEBUG */
 108
 109 static void tls_show_errors(int level, const char *func, const char *txt)
 110 {
 111         unsigned long err;
 112
 113         wpa_printf(level, "OpenSSL: %s - %s %s",
 114                    func, txt, ERR_error_string(ERR_get_error(), NULL));
 115
 116         while ((err = ERR_get_error())) {
 117                 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
 118                            ERR_error_string(err, NULL));
 119         }
 120 }
 121
 122 #endif /* CONFIG_NO_STDOUT_DEBUG */
 123
 124
 125 #ifdef CONFIG_NATIVE_WINDOWS
 126
 127 /* Windows CryptoAPI and access to certificate stores */
 128 #include <wincrypt.h>
 129
 130 #ifdef __MINGW32_VERSION
 131 /*
 132  * MinGW does not yet include all the needed definitions for CryptoAPI, so
 133  * define here whatever extra is needed.
 134  */
 135 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
 136 #define CERT_STORE_READONLY_FLAG 0x00008000
 137 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
 138
 139 #endif /* __MINGW32_VERSION */
 140
 141
 142 struct cryptoapi_rsa_data {
 143         const CERT_CONTEXT *cert;
 144         HCRYPTPROV crypt_prov;
 145         DWORD key_spec;
 146         BOOL free_crypt_prov;
 147 };
 148
 149
 150 static void cryptoapi_error(const char *msg)
 151 {
 152         wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
 153                    msg, (unsigned int) GetLastError());
 154 }
 155
 156
 157 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
 158                                  unsigned char *to, RSA *rsa, int padding)
 159 {
 160         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 161         return 0;
 162 }
 163
 164
 165 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
 166                                  unsigned char *to, RSA *rsa, int padding)
 167 {
 168         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 169         return 0;
 170 }
 171
 172
 173 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
 174                                   unsigned char *to, RSA *rsa, int padding)
 175 {
 176         struct cryptoapi_rsa_data *priv =
 177                 (struct cryptoapi_rsa_data *) rsa->meth->app_data;
 178         HCRYPTHASH hash;
 179         DWORD hash_size, len, i;
 180         unsigned char *buf = NULL;
 181         int ret = 0;
 182
 183         if (priv == NULL) {
 184                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 185                        ERR_R_PASSED_NULL_PARAMETER);
 186                 return 0;
 187         }
 188
 189         if (padding != RSA_PKCS1_PADDING) {
 190                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 191                        RSA_R_UNKNOWN_PADDING_TYPE);
 192                 return 0;
 193         }
 194
 195         if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
 196                 wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
 197                            __func__);
 198                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 199                        RSA_R_INVALID_MESSAGE_LENGTH);
 200                 return 0;
 201         }
 202
 203         if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
 204         {
 205                 cryptoapi_error("CryptCreateHash failed");
 206                 return 0;
 207         }
 208
 209         len = sizeof(hash_size);
 210         if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
 211                                0)) {
 212                 cryptoapi_error("CryptGetHashParam failed");
 213                 goto err;
 214         }
 215
 216         if ((int) hash_size != flen) {
 217                 wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
 218                            (unsigned) hash_size, flen);
 219                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 220                        RSA_R_INVALID_MESSAGE_LENGTH);
 221                 goto err;
 222         }
 223         if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
 224                 cryptoapi_error("CryptSetHashParam failed");
 225                 goto err;
 226         }
 227
 228         len = RSA_size(rsa);
 229         buf = os_malloc(len);
 230         if (buf == NULL) {
 231                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
 232                 goto err;
 233         }
 234
 235         if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
 236                 cryptoapi_error("CryptSignHash failed");
 237                 goto err;
 238         }
 239
 240         for (i = 0; i < len; i++)
 241                 to[i] = buf[len - i - 1];
 242         ret = len;
 243
 244 err:
 245         os_free(buf);
 246         CryptDestroyHash(hash);
 247
 248         return ret;
 249 }
 250
 251
 252 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
 253                                   unsigned char *to, RSA *rsa, int padding)
 254 {
 255         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 256         return 0;
 257 }
 258
 259
 260 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
 261 {
 262         if (priv == NULL)
 263                 return;
 264         if (priv->crypt_prov && priv->free_crypt_prov)
 265                 CryptReleaseContext(priv->crypt_prov, 0);
 266         if (priv->cert)
 267                 CertFreeCertificateContext(priv->cert);
 268         os_free(priv);
 269 }
 270
 271
 272 static int cryptoapi_finish(RSA *rsa)
 273 {
 274         cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
 275         os_free((void *) rsa->meth);
 276         rsa->meth = NULL;
 277         return 1;
 278 }
 279
 280
 281 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
 282 {
 283         HCERTSTORE cs;
 284         const CERT_CONTEXT *ret = NULL;
 285
 286         cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
 287                            store | CERT_STORE_OPEN_EXISTING_FLAG |
 288                            CERT_STORE_READONLY_FLAG, L"MY");
 289         if (cs == NULL) {
 290                 cryptoapi_error("Failed to open 'My system store'");
 291                 return NULL;
 292         }
 293
 294         if (strncmp(name, "cert://", 7) == 0) {
 295                 unsigned short wbuf[255];
 296                 MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
 297                 ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
 298                                                  PKCS_7_ASN_ENCODING,
 299                                                  0, CERT_FIND_SUBJECT_STR,
 300                                                  wbuf, NULL);
 301         } else if (strncmp(name, "hash://", 7) == 0) {
 302                 CRYPT_HASH_BLOB blob;
 303                 int len;
 304                 const char *hash = name + 7;
 305                 unsigned char *buf;
 306
 307                 len = os_strlen(hash) / 2;
 308                 buf = os_malloc(len);
 309                 if (buf && hexstr2bin(hash, buf, len) == 0) {
 310                         blob.cbData = len;
 311                         blob.pbData = buf;
 312                         ret = CertFindCertificateInStore(cs,
 313                                                          X509_ASN_ENCODING |
 314                                                          PKCS_7_ASN_ENCODING,
 315                                                          0, CERT_FIND_HASH,
 316                                                          &blob, NULL);
 317                 }
 318                 os_free(buf);
 319         }
 320
 321         CertCloseStore(cs, 0);
 322
 323         return ret;
 324 }
 325
 326
 327 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 328 {
 329         X509 *cert = NULL;
 330         RSA *rsa = NULL, *pub_rsa;
 331         struct cryptoapi_rsa_data *priv;
 332         RSA_METHOD *rsa_meth;
 333
 334         if (name == NULL ||
 335             (strncmp(name, "cert://", 7) != 0 &&
 336              strncmp(name, "hash://", 7) != 0))
 337                 return -1;
 338
 339         priv = os_zalloc(sizeof(*priv));
 340         rsa_meth = os_zalloc(sizeof(*rsa_meth));
 341         if (priv == NULL || rsa_meth == NULL) {
 342                 wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
 343                            "for CryptoAPI RSA method");
 344                 os_free(priv);
 345                 os_free(rsa_meth);
 346                 return -1;
 347         }
 348
 349         priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
 350         if (priv->cert == NULL) {
 351                 priv->cert = cryptoapi_find_cert(
 352                         name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
 353         }
 354         if (priv->cert == NULL) {
 355                 wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
 356                            "'%s'", name);
 357                 goto err;
 358         }
 359
 360         cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &priv->cert->pbCertEncoded,
 361                         priv->cert->cbCertEncoded);
 362         if (cert == NULL) {
 363                 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
 364                            "encoding");
 365                 goto err;
 366         }
 367
 368         if (!CryptAcquireCertificatePrivateKey(priv->cert,
 369                                                CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
 370                                                NULL, &priv->crypt_prov,
 371                                                &priv->key_spec,
 372                                                &priv->free_crypt_prov)) {
 373                 cryptoapi_error("Failed to acquire a private key for the "
 374                                 "certificate");
 375                 goto err;
 376         }
 377
 378         rsa_meth->name = "Microsoft CryptoAPI RSA Method";
 379         rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
 380         rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
 381         rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
 382         rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
 383         rsa_meth->finish = cryptoapi_finish;
 384         rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
 385         rsa_meth->app_data = (char *) priv;
 386
 387         rsa = RSA_new();
 388         if (rsa == NULL) {
 389                 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
 390                        ERR_R_MALLOC_FAILURE);
 391                 goto err;
 392         }
 393
 394         if (!SSL_use_certificate(ssl, cert)) {
 395                 RSA_free(rsa);
 396                 rsa = NULL;
 397                 goto err;
 398         }
 399         pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
 400         X509_free(cert);
 401         cert = NULL;
 402
 403         rsa->n = BN_dup(pub_rsa->n);
 404         rsa->e = BN_dup(pub_rsa->e);
 405         if (!RSA_set_method(rsa, rsa_meth))
 406                 goto err;
 407
 408         if (!SSL_use_RSAPrivateKey(ssl, rsa))
 409                 goto err;
 410         RSA_free(rsa);
 411
 412         return 0;
 413
 414 err:
 415         if (cert)
 416                 X509_free(cert);
 417         if (rsa)
 418                 RSA_free(rsa);
 419         else {
 420                 os_free(rsa_meth);
 421                 cryptoapi_free_data(priv);
 422         }
 423         return -1;
 424 }
 425
 426
 427 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
 428 {
 429         HCERTSTORE cs;
 430         PCCERT_CONTEXT ctx = NULL;
 431         X509 *cert;
 432         char buf[128];
 433         const char *store;
 434 #ifdef UNICODE
 435         WCHAR *wstore;
 436 #endif /* UNICODE */
 437
 438         if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
 439                 return -1;
 440
 441         store = name + 13;
 442 #ifdef UNICODE
 443         wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
 444         if (wstore == NULL)
 445                 return -1;
 446         wsprintf(wstore, L"%S", store);
 447         cs = CertOpenSystemStore(0, wstore);
 448         os_free(wstore);
 449 #else /* UNICODE */
 450         cs = CertOpenSystemStore(0, store);
 451 #endif /* UNICODE */
 452         if (cs == NULL) {
 453                 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
 454                            "'%s': error=%d", __func__, store,
 455                            (int) GetLastError());
 456                 return -1;
 457         }
 458
 459         while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
 460                 cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ctx->pbCertEncoded,
 461                                 ctx->cbCertEncoded);
 462                 if (cert == NULL) {
 463                         wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
 464                                    "X509 DER encoding for CA cert");
 465                         continue;
 466                 }
 467
 468                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
 469                                   sizeof(buf));
 470                 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
 471                            "system certificate store: subject='%s'", buf);
 472
 473                 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
 474                         tls_show_errors(MSG_WARNING, __func__,
 475                                         "Failed to add ca_cert to OpenSSL "
 476                                         "certificate store");
 477                 }
 478
 479                 X509_free(cert);
 480         }
 481
 482         if (!CertCloseStore(cs, 0)) {
 483                 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
 484                            "'%s': error=%d", __func__, name + 13,
 485                            (int) GetLastError());
 486         }
 487
 488         return 0;
 489 }
 490
 491
 492 #else /* CONFIG_NATIVE_WINDOWS */
 493
 494 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 495 {
 496         return -1;
 497 }
 498
 499 #endif /* CONFIG_NATIVE_WINDOWS */
 500
 501
 502 static void ssl_info_cb(const SSL *ssl, int where, int ret)
 503 {
 504         const char *str;
 505         int w;
 506
 507         wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
 508         w = where & ~SSL_ST_MASK;
 509         if (w & SSL_ST_CONNECT)
 510                 str = "SSL_connect";
 511         else if (w & SSL_ST_ACCEPT)
 512                 str = "SSL_accept";
 513         else
 514                 str = "undefined";
 515
 516         if (where & SSL_CB_LOOP) {
 517                 wpa_printf(MSG_DEBUG, "SSL: %s:%s",
 518                            str, SSL_state_string_long(ssl));
 519         } else if (where & SSL_CB_ALERT) {
 520                 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
 521                            where & SSL_CB_READ ?
 522                            "read (remote end reported an error)" :
 523                            "write (local SSL3 detected an error)",
 524                            SSL_alert_type_string_long(ret),
 525                            SSL_alert_desc_string_long(ret));
 526                 if ((ret >> 8) == SSL3_AL_FATAL) {
 527                         struct tls_connection *conn =
 528                                 SSL_get_app_data((SSL *) ssl);
 529                         if (where & SSL_CB_READ)
 530                                 conn->read_alerts++;
 531                         else
 532                                 conn->write_alerts++;
 533                 }
 534         } else if (where & SSL_CB_EXIT && ret <= 0) {
 535                 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
 536                            str, ret == 0 ? "failed" : "error",
 537                            SSL_state_string_long(ssl));
 538         }
 539 }
 540
 541
 542 #ifndef OPENSSL_NO_ENGINE
 543 /**
 544  * tls_engine_load_dynamic_generic - load any openssl engine
 545  * @pre: an array of commands and values that load an engine initialized
 546  *       in the engine specific function
 547  * @post: an array of commands and values that initialize an already loaded
 548  *        engine (or %NULL if not required)
 549  * @id: the engine id of the engine to load (only required if post is not %NULL
 550  *
 551  * This function is a generic function that loads any openssl engine.
 552  *
 553  * Returns: 0 on success, -1 on failure
 554  */
 555 static int tls_engine_load_dynamic_generic(const char *pre[],
 556                                            const char *post[], const char *id)
 557 {
 558         ENGINE *engine;
 559         const char *dynamic_id = "dynamic";
 560
 561         engine = ENGINE_by_id(id);
 562         if (engine) {
 563                 ENGINE_free(engine);
 564                 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
 565                            "available", id);
 566                 return 0;
 567         }
 568         ERR_clear_error();
 569
 570         engine = ENGINE_by_id(dynamic_id);
 571         if (engine == NULL) {
 572                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 573                            dynamic_id,
 574                            ERR_error_string(ERR_get_error(), NULL));
 575                 return -1;
 576         }
 577
 578         /* Perform the pre commands. This will load the engine. */
 579         while (pre && pre[0]) {
 580                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
 581                 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
 582                         wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
 583                                    "%s %s [%s]", pre[0], pre[1],
 584                                    ERR_error_string(ERR_get_error(), NULL));
 585                         ENGINE_free(engine);
 586                         return -1;
 587                 }
 588                 pre += 2;
 589         }
 590
 591         /*
 592          * Free the reference to the "dynamic" engine. The loaded engine can
 593          * now be looked up using ENGINE_by_id().
 594          */
 595         ENGINE_free(engine);
 596
 597         engine = ENGINE_by_id(id);
 598         if (engine == NULL) {
 599                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 600                            id, ERR_error_string(ERR_get_error(), NULL));
 601                 return -1;
 602         }
 603
 604         while (post && post[0]) {
 605                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
 606                 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
 607                         wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
 608                                 " %s %s [%s]", post[0], post[1],
 609                                    ERR_error_string(ERR_get_error(), NULL));
 610                         ENGINE_remove(engine);
 611                         ENGINE_free(engine);
 612                         return -1;
 613                 }
 614                 post += 2;
 615         }
 616         ENGINE_free(engine);
 617
 618         return 0;
 619 }
 620
 621
 622 /**
 623  * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
 624  * @pkcs11_so_path: pksc11_so_path from the configuration
 625  * @pcks11_module_path: pkcs11_module_path from the configuration
 626  */
 627 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
 628                                           const char *pkcs11_module_path)
 629 {
 630         char *engine_id = "pkcs11";
 631         const char *pre_cmd[] = {
 632                 "SO_PATH", NULL /* pkcs11_so_path */,
 633                 "ID", NULL /* engine_id */,
 634                 "LIST_ADD", "1",
 635                 /* "NO_VCHECK", "1", */
 636                 "LOAD", NULL,
 637                 NULL, NULL
 638         };
 639         const char *post_cmd[] = {
 640                 "MODULE_PATH", NULL /* pkcs11_module_path */,
 641                 NULL, NULL
 642         };
 643
 644         if (!pkcs11_so_path || !pkcs11_module_path)
 645                 return 0;
 646
 647         pre_cmd[1] = pkcs11_so_path;
 648         pre_cmd[3] = engine_id;
 649         post_cmd[1] = pkcs11_module_path;
 650
 651         wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
 652                    pkcs11_so_path);
 653
 654         return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
 655 }
 656
 657
 658 /**
 659  * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
 660  * @opensc_so_path: opensc_so_path from the configuration
 661  */
 662 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
 663 {
 664         char *engine_id = "opensc";
 665         const char *pre_cmd[] = {
 666                 "SO_PATH", NULL /* opensc_so_path */,
 667                 "ID", NULL /* engine_id */,
 668                 "LIST_ADD", "1",
 669                 "LOAD", NULL,
 670                 NULL, NULL
 671         };
 672
 673         if (!opensc_so_path)
 674                 return 0;
 675
 676         pre_cmd[1] = opensc_so_path;
 677         pre_cmd[3] = engine_id;
 678
 679         wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
 680                    opensc_so_path);
 681
 682         return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
 683 }
 684 #endif /* OPENSSL_NO_ENGINE */
 685
 686
 687 void * tls_init(const struct tls_config *conf)
 688 {
 689         SSL_CTX *ssl;
 690
 691         if (tls_openssl_ref_count == 0) {
 692                 tls_global = os_zalloc(sizeof(*tls_global));
 693                 if (tls_global == NULL)
 694                         return NULL;
 695                 if (conf) {
 696                         tls_global->event_cb = conf->event_cb;
 697                         tls_global->cb_ctx = conf->cb_ctx;
 698                         tls_global->cert_in_cb = conf->cert_in_cb;
 699                 }
 700
 701 #ifdef CONFIG_FIPS
 702 #ifdef OPENSSL_FIPS
 703                 if (conf && conf->fips_mode) {
 704                         if (!FIPS_mode_set(1)) {
 705                                 wpa_printf(MSG_ERROR, "Failed to enable FIPS "
 706                                            "mode");
 707                                 ERR_load_crypto_strings();
 708                                 ERR_print_errors_fp(stderr);
 709                                 return NULL;
 710                         } else
 711                                 wpa_printf(MSG_INFO, "Running in FIPS mode");
 712                 }
 713 #else /* OPENSSL_FIPS */
 714                 if (conf && conf->fips_mode) {
 715                         wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
 716                                    "supported");
 717                         return NULL;
 718                 }
 719 #endif /* OPENSSL_FIPS */
 720 #endif /* CONFIG_FIPS */
 721                 SSL_load_error_strings();
 722                 SSL_library_init();
 723 #if (OPENSSL_VERSION_NUMBER >= 0x0090800fL) && !defined(OPENSSL_NO_SHA256)
 724                 EVP_add_digest(EVP_sha256());
 725 #endif /* OPENSSL_NO_SHA256 */
 726                 /* TODO: if /dev/urandom is available, PRNG is seeded
 727                  * automatically. If this is not the case, random data should
 728                  * be added here. */
 729
 730 #ifdef PKCS12_FUNCS
 731 #ifndef OPENSSL_NO_RC2
 732                 /*
 733                  * 40-bit RC2 is commonly used in PKCS#12 files, so enable it.
 734                  * This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8
 735                  * versions, but it looks like OpenSSL 1.0.0 does not do that
 736                  * anymore.
 737                  */
 738                 EVP_add_cipher(EVP_rc2_40_cbc());
 739 #endif /* OPENSSL_NO_RC2 */
 740                 PKCS12_PBE_add();
 741 #endif  /* PKCS12_FUNCS */
 742         }
 743         tls_openssl_ref_count++;
 744
 745         ssl = SSL_CTX_new(TLSv1_method());
 746         if (ssl == NULL)
 747                 return NULL;
 748
 749         SSL_CTX_set_info_callback(ssl, ssl_info_cb);
 750
 751 #ifndef OPENSSL_NO_ENGINE
 752         if (conf &&
 753             (conf->opensc_engine_path || conf->pkcs11_engine_path ||
 754              conf->pkcs11_module_path)) {
 755                 wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
 756                 ERR_load_ENGINE_strings();
 757                 ENGINE_load_dynamic();
 758
 759                 if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
 760                     tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
 761                                                    conf->pkcs11_module_path)) {
 762                         tls_deinit(ssl);
 763                         return NULL;
 764                 }
 765         }
 766 #endif /* OPENSSL_NO_ENGINE */
 767
 768         return ssl;
 769 }
 770
 771
 772 void tls_deinit(void *ssl_ctx)
 773 {
 774         SSL_CTX *ssl = ssl_ctx;
 775         SSL_CTX_free(ssl);
 776
 777         tls_openssl_ref_count--;
 778         if (tls_openssl_ref_count == 0) {
 779 #ifndef OPENSSL_NO_ENGINE
 780                 ENGINE_cleanup();
 781 #endif /* OPENSSL_NO_ENGINE */
 782                 CRYPTO_cleanup_all_ex_data();
 783                 ERR_remove_state(0);
 784                 ERR_free_strings();
 785                 EVP_cleanup();
 786                 os_free(tls_global);
 787                 tls_global = NULL;
 788         }
 789 }
 790
 791
 792 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
 793                            const char *pin, const char *key_id,
 794                            const char *cert_id, const char *ca_cert_id)
 795 {
 796 #ifndef OPENSSL_NO_ENGINE
 797         int ret = -1;
 798         if (engine_id == NULL) {
 799                 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
 800                 return -1;
 801         }
 802         if (pin == NULL) {
 803                 wpa_printf(MSG_ERROR, "ENGINE: Smartcard PIN not set");
 804                 return -1;
 805         }
 806         if (key_id == NULL) {
 807                 wpa_printf(MSG_ERROR, "ENGINE: Key Id not set");
 808                 return -1;
 809         }
 810
 811         ERR_clear_error();
 812         conn->engine = ENGINE_by_id(engine_id);
 813         if (!conn->engine) {
 814                 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
 815                            engine_id, ERR_error_string(ERR_get_error(), NULL));
 816                 goto err;
 817         }
 818         if (ENGINE_init(conn->engine) != 1) {
 819                 wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
 820                            "(engine: %s) [%s]", engine_id,
 821                            ERR_error_string(ERR_get_error(), NULL));
 822                 goto err;
 823         }
 824         wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
 825
 826         if (ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
 827                 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
 828                            ERR_error_string(ERR_get_error(), NULL));
 829                 goto err;
 830         }
 831         /* load private key first in-case PIN is required for cert */
 832         conn->private_key = ENGINE_load_private_key(conn->engine,
 833                                                     key_id, NULL, NULL);
 834         if (!conn->private_key) {
 835                 wpa_printf(MSG_ERROR, "ENGINE: cannot load private key with id"
 836                                 " '%s' [%s]", key_id,
 837                            ERR_error_string(ERR_get_error(), NULL));
 838                 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
 839                 goto err;
 840         }
 841
 842         /* handle a certificate and/or CA certificate */
 843         if (cert_id || ca_cert_id) {
 844                 const char *cmd_name = "LOAD_CERT_CTRL";
 845
 846                 /* test if the engine supports a LOAD_CERT_CTRL */
 847                 if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
 848                                  0, (void *)cmd_name, NULL)) {
 849                         wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
 850                                    " loading certificates");
 851                         ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
 852                         goto err;
 853                 }
 854         }
 855
 856         return 0;
 857
 858 err:
 859         if (conn->engine) {
 860                 ENGINE_free(conn->engine);
 861                 conn->engine = NULL;
 862         }
 863
 864         if (conn->private_key) {
 865                 EVP_PKEY_free(conn->private_key);
 866                 conn->private_key = NULL;
 867         }
 868
 869         return ret;
 870 #else /* OPENSSL_NO_ENGINE */
 871         return 0;
 872 #endif /* OPENSSL_NO_ENGINE */
 873 }
 874
 875
 876 static void tls_engine_deinit(struct tls_connection *conn)
 877 {
 878 #ifndef OPENSSL_NO_ENGINE
 879         wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
 880         if (conn->private_key) {
 881                 EVP_PKEY_free(conn->private_key);
 882                 conn->private_key = NULL;
 883         }
 884         if (conn->engine) {
 885                 ENGINE_finish(conn->engine);
 886                 conn->engine = NULL;
 887         }
 888 #endif /* OPENSSL_NO_ENGINE */
 889 }
 890
 891
 892 int tls_get_errors(void *ssl_ctx)
 893 {
 894         int count = 0;
 895         unsigned long err;
 896
 897         while ((err = ERR_get_error())) {
 898                 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
 899                            ERR_error_string(err, NULL));
 900                 count++;
 901         }
 902
 903         return count;
 904 }
 905
 906 struct tls_connection * tls_connection_init(void *ssl_ctx)
 907 {
 908         SSL_CTX *ssl = ssl_ctx;
 909         struct tls_connection *conn;
 910         long options;
 911
 912         conn = os_zalloc(sizeof(*conn));
 913         if (conn == NULL)
 914                 return NULL;
 915         conn->ssl = SSL_new(ssl);
 916         if (conn->ssl == NULL) {
 917                 tls_show_errors(MSG_INFO, __func__,
 918                                 "Failed to initialize new SSL connection");
 919                 os_free(conn);
 920                 return NULL;
 921         }
 922
 923         SSL_set_app_data(conn->ssl, conn);
 924         options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
 925                 SSL_OP_SINGLE_DH_USE;
 926 #ifdef SSL_OP_NO_COMPRESSION
 927         options |= SSL_OP_NO_COMPRESSION;
 928 #endif /* SSL_OP_NO_COMPRESSION */
 929         SSL_set_options(conn->ssl, options);
 930
 931         conn->ssl_in = BIO_new(BIO_s_mem());
 932         if (!conn->ssl_in) {
 933                 tls_show_errors(MSG_INFO, __func__,
 934                                 "Failed to create a new BIO for ssl_in");
 935                 SSL_free(conn->ssl);
 936                 os_free(conn);
 937                 return NULL;
 938         }
 939
 940         conn->ssl_out = BIO_new(BIO_s_mem());
 941         if (!conn->ssl_out) {
 942                 tls_show_errors(MSG_INFO, __func__,
 943                                 "Failed to create a new BIO for ssl_out");
 944                 SSL_free(conn->ssl);
 945                 BIO_free(conn->ssl_in);
 946                 os_free(conn);
 947                 return NULL;
 948         }
 949
 950         SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
 951
 952         return conn;
 953 }
 954
 955
 956 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
 957 {
 958         if (conn == NULL)
 959                 return;
 960         SSL_free(conn->ssl);
 961         tls_engine_deinit(conn);
 962         os_free(conn->subject_match);
 963         os_free(conn->altsubject_match);
 964         os_free(conn->session_ticket);
 965         os_free(conn);
 966 }
 967
 968
 969 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
 970 {
 971         return conn ? SSL_is_init_finished(conn->ssl) : 0;
 972 }
 973
 974
 975 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
 976 {
 977         if (conn == NULL)
 978                 return -1;
 979
 980         /* Shutdown previous TLS connection without notifying the peer
 981          * because the connection was already terminated in practice
 982          * and "close notify" shutdown alert would confuse AS. */
 983         SSL_set_quiet_shutdown(conn->ssl, 1);
 984         SSL_shutdown(conn->ssl);
 985         return 0;
 986 }
 987
 988
 989 static int tls_match_altsubject_component(X509 *cert, int type,
 990                                           const char *value, size_t len)
 991 {
 992         GENERAL_NAME *gen;
 993         void *ext;
 994         int i, found = 0;
 995
 996         ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
 997
 998         for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
 999                 gen = sk_GENERAL_NAME_value(ext, i);
1000                 if (gen->type != type)
1001                         continue;
1002                 if (os_strlen((char *) gen->d.ia5->data) == len &&
1003                     os_memcmp(value, gen->d.ia5->data, len) == 0)
1004                         found++;
1005         }
1006
1007         return found;
1008 }
1009
1010
1011 static int tls_match_altsubject(X509 *cert, const char *match)
1012 {
1013         int type;
1014         const char *pos, *end;
1015         size_t len;
1016
1017         pos = match;
1018         do {
1019                 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
1020                         type = GEN_EMAIL;
1021                         pos += 6;
1022                 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
1023                         type = GEN_DNS;
1024                         pos += 4;
1025                 } else if (os_strncmp(pos, "URI:", 4) == 0) {
1026                         type = GEN_URI;
1027                         pos += 4;
1028                 } else {
1029                         wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1030                                    "match '%s'", pos);
1031                         return 0;
1032                 }
1033                 end = os_strchr(pos, ';');
1034                 while (end) {
1035                         if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1036                             os_strncmp(end + 1, "DNS:", 4) == 0 ||
1037                             os_strncmp(end + 1, "URI:", 4) == 0)
1038                                 break;
1039                         end = os_strchr(end + 1, ';');
1040                 }
1041                 if (end)
1042                         len = end - pos;
1043                 else
1044                         len = os_strlen(pos);
1045                 if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1046                         return 1;
1047                 pos = end + 1;
1048         } while (end);
1049
1050         return 0;
1051 }
1052
1053
1054 static enum tls_fail_reason openssl_tls_fail_reason(int err)
1055 {
1056         switch (err) {
1057         case X509_V_ERR_CERT_REVOKED:
1058                 return TLS_FAIL_REVOKED;
1059         case X509_V_ERR_CERT_NOT_YET_VALID:
1060         case X509_V_ERR_CRL_NOT_YET_VALID:
1061                 return TLS_FAIL_NOT_YET_VALID;
1062         case X509_V_ERR_CERT_HAS_EXPIRED:
1063         case X509_V_ERR_CRL_HAS_EXPIRED:
1064                 return TLS_FAIL_EXPIRED;
1065         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1066         case X509_V_ERR_UNABLE_TO_GET_CRL:
1067         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
1068         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
1069         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
1070         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
1071         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
1072         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
1073         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
1074         case X509_V_ERR_INVALID_CA:
1075                 return TLS_FAIL_UNTRUSTED;
1076         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
1077         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
1078         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
1079         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1080         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1081         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
1082         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
1083         case X509_V_ERR_CERT_UNTRUSTED:
1084         case X509_V_ERR_CERT_REJECTED:
1085                 return TLS_FAIL_BAD_CERTIFICATE;
1086         default:
1087                 return TLS_FAIL_UNSPECIFIED;
1088         }
1089 }
1090
1091
1092 static struct wpabuf * get_x509_cert(X509 *cert)
1093 {
1094         struct wpabuf *buf;
1095         u8 *tmp;
1096
1097         int cert_len = i2d_X509(cert, NULL);
1098         if (cert_len <= 0)
1099                 return NULL;
1100
1101         buf = wpabuf_alloc(cert_len);
1102         if (buf == NULL)
1103                 return NULL;
1104
1105         tmp = wpabuf_put(buf, cert_len);
1106         i2d_X509(cert, &tmp);
1107         return buf;
1108 }
1109
1110
1111 static void openssl_tls_fail_event(struct tls_connection *conn,
1112                                    X509 *err_cert, int err, int depth,
1113                                    const char *subject, const char *err_str,
1114                                    enum tls_fail_reason reason)
1115 {
1116         union tls_event_data ev;
1117         struct wpabuf *cert = NULL;
1118
1119         if (tls_global->event_cb == NULL)
1120                 return;
1121
1122         cert = get_x509_cert(err_cert);
1123         os_memset(&ev, 0, sizeof(ev));
1124         ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
1125                 reason : openssl_tls_fail_reason(err);
1126         ev.cert_fail.depth = depth;
1127         ev.cert_fail.subject = subject;
1128         ev.cert_fail.reason_txt = err_str;
1129         ev.cert_fail.cert = cert;
1130         tls_global->event_cb(tls_global->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
1131         wpabuf_free(cert);
1132 }
1133
1134
1135 static void openssl_tls_cert_event(struct tls_connection *conn,
1136                                    X509 *err_cert, int depth,
1137                                    const char *subject)
1138 {
1139         struct wpabuf *cert = NULL;
1140         union tls_event_data ev;
1141 #ifdef CONFIG_SHA256
1142         u8 hash[32];
1143 #endif /* CONFIG_SHA256 */
1144
1145         if (tls_global->event_cb == NULL)
1146                 return;
1147
1148         os_memset(&ev, 0, sizeof(ev));
1149         if (conn->cert_probe || tls_global->cert_in_cb) {
1150                 cert = get_x509_cert(err_cert);
1151                 ev.peer_cert.cert = cert;
1152         }
1153 #ifdef CONFIG_SHA256
1154         if (cert) {
1155                 const u8 *addr[1];
1156                 size_t len[1];
1157                 addr[0] = wpabuf_head(cert);
1158                 len[0] = wpabuf_len(cert);
1159                 if (sha256_vector(1, addr, len, hash) == 0) {
1160                         ev.peer_cert.hash = hash;
1161                         ev.peer_cert.hash_len = sizeof(hash);
1162                 }
1163         }
1164 #endif /* CONFIG_SHA256 */
1165         ev.peer_cert.depth = depth;
1166         ev.peer_cert.subject = subject;
1167         tls_global->event_cb(tls_global->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
1168         wpabuf_free(cert);
1169 }
1170
1171
1172 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
1173 {
1174         char buf[256];
1175         X509 *err_cert;
1176         int err, depth;
1177         SSL *ssl;
1178         struct tls_connection *conn;
1179         char *match, *altmatch;
1180         const char *err_str;
1181
1182         err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
1183         err = X509_STORE_CTX_get_error(x509_ctx);
1184         depth = X509_STORE_CTX_get_error_depth(x509_ctx);
1185         ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
1186                                          SSL_get_ex_data_X509_STORE_CTX_idx());
1187         X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
1188
1189         conn = SSL_get_app_data(ssl);
1190         if (conn == NULL)
1191                 return 0;
1192         match = conn->subject_match;
1193         altmatch = conn->altsubject_match;
1194
1195         if (!preverify_ok && !conn->ca_cert_verify)
1196                 preverify_ok = 1;
1197         if (!preverify_ok && depth > 0 && conn->server_cert_only)
1198                 preverify_ok = 1;
1199         if (!preverify_ok && (conn->flags & TLS_CONN_DISABLE_TIME_CHECKS) &&
1200             (err == X509_V_ERR_CERT_HAS_EXPIRED ||
1201              err == X509_V_ERR_CERT_NOT_YET_VALID)) {
1202                 wpa_printf(MSG_DEBUG, "OpenSSL: Ignore certificate validity "
1203                            "time mismatch");
1204                 preverify_ok = 1;
1205         }
1206
1207         err_str = X509_verify_cert_error_string(err);
1208
1209 #ifdef CONFIG_SHA256
1210         if (preverify_ok && depth == 0 && conn->server_cert_only) {
1211                 struct wpabuf *cert;
1212                 cert = get_x509_cert(err_cert);
1213                 if (!cert) {
1214                         wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch "
1215                                    "server certificate data");
1216                         preverify_ok = 0;
1217                 } else {
1218                         u8 hash[32];
1219                         const u8 *addr[1];
1220                         size_t len[1];
1221                         addr[0] = wpabuf_head(cert);
1222                         len[0] = wpabuf_len(cert);
1223                         if (sha256_vector(1, addr, len, hash) < 0 ||
1224                             os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
1225                                 err_str = "Server certificate mismatch";
1226                                 err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
1227                                 preverify_ok = 0;
1228                         }
1229                         wpabuf_free(cert);
1230                 }
1231         }
1232 #endif /* CONFIG_SHA256 */
1233
1234         if (!preverify_ok) {
1235                 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
1236                            " error %d (%s) depth %d for '%s'", err, err_str,
1237                            depth, buf);
1238                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1239                                        err_str, TLS_FAIL_UNSPECIFIED);
1240                 return preverify_ok;
1241         }
1242
1243         wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d "
1244                    "err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
1245                    preverify_ok, err, err_str,
1246                    conn->ca_cert_verify, depth, buf);
1247         if (depth == 0 && match && os_strstr(buf, match) == NULL) {
1248                 wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
1249                            "match with '%s'", buf, match);
1250                 preverify_ok = 0;
1251                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1252                                        "Subject mismatch",
1253                                        TLS_FAIL_SUBJECT_MISMATCH);
1254         } else if (depth == 0 && altmatch &&
1255                    !tls_match_altsubject(err_cert, altmatch)) {
1256                 wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
1257                            "'%s' not found", altmatch);
1258                 preverify_ok = 0;
1259                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1260                                        "AltSubject mismatch",
1261                                        TLS_FAIL_ALTSUBJECT_MISMATCH);
1262         } else
1263                 openssl_tls_cert_event(conn, err_cert, depth, buf);
1264
1265         if (conn->cert_probe && preverify_ok && depth == 0) {
1266                 wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate "
1267                            "on probe-only run");
1268                 preverify_ok = 0;
1269                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1270                                        "Server certificate chain probe",
1271                                        TLS_FAIL_SERVER_CHAIN_PROBE);
1272         }
1273
1274         return preverify_ok;
1275 }
1276
1277
1278 #ifndef OPENSSL_NO_STDIO
1279 static int tls_load_ca_der(void *_ssl_ctx, const char *ca_cert)
1280 {
1281         SSL_CTX *ssl_ctx = _ssl_ctx;
1282         X509_LOOKUP *lookup;
1283         int ret = 0;
1284
1285         lookup = X509_STORE_add_lookup(ssl_ctx->cert_store,
1286                                        X509_LOOKUP_file());
1287         if (lookup == NULL) {
1288                 tls_show_errors(MSG_WARNING, __func__,
1289                                 "Failed add lookup for X509 store");
1290                 return -1;
1291         }
1292
1293         if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
1294                 unsigned long err = ERR_peek_error();
1295                 tls_show_errors(MSG_WARNING, __func__,
1296                                 "Failed load CA in DER format");
1297                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1298                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1299                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1300                                    "cert already in hash table error",
1301                                    __func__);
1302                 } else
1303                         ret = -1;
1304         }
1305
1306         return ret;
1307 }
1308 #endif /* OPENSSL_NO_STDIO */
1309
1310
1311 #ifdef ANDROID
1312 static BIO * BIO_from_keystore(const char *key)
1313 {
1314         BIO *bio = NULL;
1315         char value[KEYSTORE_MESSAGE_SIZE];
1316         int length = keystore_get(key, strlen(key), value);
1317         if (length != -1 && (bio = BIO_new(BIO_s_mem())) != NULL)
1318                 BIO_write(bio, value, length);
1319         return bio;
1320 }
1321 #endif /* ANDROID */
1322
1323
1324 static int tls_connection_ca_cert(void *_ssl_ctx, struct tls_connection *conn,
1325                                   const char *ca_cert, const u8 *ca_cert_blob,
1326                                   size_t ca_cert_blob_len, const char *ca_path)
1327 {
1328         SSL_CTX *ssl_ctx = _ssl_ctx;
1329
1330         /*
1331          * Remove previously configured trusted CA certificates before adding
1332          * new ones.
1333          */
1334         X509_STORE_free(ssl_ctx->cert_store);
1335         ssl_ctx->cert_store = X509_STORE_new();
1336         if (ssl_ctx->cert_store == NULL) {
1337                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1338                            "certificate store", __func__);
1339                 return -1;
1340         }
1341
1342         SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1343         conn->ca_cert_verify = 1;
1344
1345         if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
1346                 wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate "
1347                            "chain");
1348                 conn->cert_probe = 1;
1349                 conn->ca_cert_verify = 0;
1350                 return 0;
1351         }
1352
1353         if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
1354 #ifdef CONFIG_SHA256
1355                 const char *pos = ca_cert + 7;
1356                 if (os_strncmp(pos, "server/sha256/", 14) != 0) {
1357                         wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert "
1358                                    "hash value '%s'", ca_cert);
1359                         return -1;
1360                 }
1361                 pos += 14;
1362                 if (os_strlen(pos) != 32 * 2) {
1363                         wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 "
1364                                    "hash length in ca_cert '%s'", ca_cert);
1365                         return -1;
1366                 }
1367                 if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
1368                         wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash "
1369                                    "value in ca_cert '%s'", ca_cert);
1370                         return -1;
1371                 }
1372                 conn->server_cert_only = 1;
1373                 wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server "
1374                            "certificate match");
1375                 return 0;
1376 #else /* CONFIG_SHA256 */
1377                 wpa_printf(MSG_INFO, "No SHA256 included in the build - "
1378                            "cannot validate server certificate hash");
1379                 return -1;
1380 #endif /* CONFIG_SHA256 */
1381         }
1382
1383         if (ca_cert_blob) {
1384                 X509 *cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ca_cert_blob,
1385                                       ca_cert_blob_len);
1386                 if (cert == NULL) {
1387                         tls_show_errors(MSG_WARNING, __func__,
1388                                         "Failed to parse ca_cert_blob");
1389                         return -1;
1390                 }
1391
1392                 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
1393                         unsigned long err = ERR_peek_error();
1394                         tls_show_errors(MSG_WARNING, __func__,
1395                                         "Failed to add ca_cert_blob to "
1396                                         "certificate store");
1397                         if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1398                             ERR_GET_REASON(err) ==
1399                             X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1400                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1401                                            "cert already in hash table error",
1402                                            __func__);
1403                         } else {
1404                                 X509_free(cert);
1405                                 return -1;
1406                         }
1407                 }
1408                 X509_free(cert);
1409                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
1410                            "to certificate store", __func__);
1411                 return 0;
1412         }
1413
1414 #ifdef ANDROID
1415         if (ca_cert && os_strncmp("keystore://", ca_cert, 11) == 0) {
1416                 BIO *bio = BIO_from_keystore(&ca_cert[11]);
1417                 STACK_OF(X509_INFO) *stack = NULL;
1418                 int i;
1419
1420                 if (bio) {
1421                         stack = PEM_X509_INFO_read_bio(bio, NULL, NULL, NULL);
1422                         BIO_free(bio);
1423                 }
1424                 if (!stack)
1425                         return -1;
1426
1427                 for (i = 0; i < sk_X509_INFO_num(stack); ++i) {
1428                         X509_INFO *info = sk_X509_INFO_value(stack, i);
1429                         if (info->x509) {
1430                                 X509_STORE_add_cert(ssl_ctx->cert_store,
1431                                                     info->x509);
1432                         }
1433                         if (info->crl) {
1434                                 X509_STORE_add_crl(ssl_ctx->cert_store,
1435                                                    info->crl);
1436                         }
1437                 }
1438                 sk_X509_INFO_pop_free(stack, X509_INFO_free);
1439                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1440                 return 0;
1441         }
1442 #endif /* ANDROID */
1443
1444 #ifdef CONFIG_NATIVE_WINDOWS
1445         if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
1446             0) {
1447                 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
1448                            "system certificate store");
1449                 return 0;
1450         }
1451 #endif /* CONFIG_NATIVE_WINDOWS */
1452
1453         if (ca_cert || ca_path) {
1454 #ifndef OPENSSL_NO_STDIO
1455                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
1456                     1) {
1457                         tls_show_errors(MSG_WARNING, __func__,
1458                                         "Failed to load root certificates");
1459                         if (ca_cert &&
1460                             tls_load_ca_der(ssl_ctx, ca_cert) == 0) {
1461                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
1462                                            "DER format CA certificate",
1463                                            __func__);
1464                         } else
1465                                 return -1;
1466                 } else {
1467                         wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1468                                    "certificate(s) loaded");
1469                         tls_get_errors(ssl_ctx);
1470                 }
1471 #else /* OPENSSL_NO_STDIO */
1472                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1473                            __func__);
1474                 return -1;
1475 #endif /* OPENSSL_NO_STDIO */
1476         } else {
1477                 /* No ca_cert configured - do not try to verify server
1478                  * certificate */
1479                 conn->ca_cert_verify = 0;
1480         }
1481
1482         return 0;
1483 }
1484
1485
1486 static int tls_global_ca_cert(SSL_CTX *ssl_ctx, const char *ca_cert)
1487 {
1488         if (ca_cert) {
1489                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
1490                 {
1491                         tls_show_errors(MSG_WARNING, __func__,
1492                                         "Failed to load root certificates");
1493                         return -1;
1494                 }
1495
1496                 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1497                            "certificate(s) loaded");
1498
1499 #ifndef OPENSSL_NO_STDIO
1500                 /* Add the same CAs to the client certificate requests */
1501                 SSL_CTX_set_client_CA_list(ssl_ctx,
1502                                            SSL_load_client_CA_file(ca_cert));
1503 #endif /* OPENSSL_NO_STDIO */
1504         }
1505
1506         return 0;
1507 }
1508
1509
1510 int tls_global_set_verify(void *ssl_ctx, int check_crl)
1511 {
1512         int flags;
1513
1514         if (check_crl) {
1515                 X509_STORE *cs = SSL_CTX_get_cert_store(ssl_ctx);
1516                 if (cs == NULL) {
1517                         tls_show_errors(MSG_INFO, __func__, "Failed to get "
1518                                         "certificate store when enabling "
1519                                         "check_crl");
1520                         return -1;
1521                 }
1522                 flags = X509_V_FLAG_CRL_CHECK;
1523                 if (check_crl == 2)
1524                         flags |= X509_V_FLAG_CRL_CHECK_ALL;
1525                 X509_STORE_set_flags(cs, flags);
1526         }
1527         return 0;
1528 }
1529
1530
1531 static int tls_connection_set_subject_match(struct tls_connection *conn,
1532                                             const char *subject_match,
1533                                             const char *altsubject_match)
1534 {
1535         os_free(conn->subject_match);
1536         conn->subject_match = NULL;
1537         if (subject_match) {
1538                 conn->subject_match = os_strdup(subject_match);
1539                 if (conn->subject_match == NULL)
1540                         return -1;
1541         }
1542
1543         os_free(conn->altsubject_match);
1544         conn->altsubject_match = NULL;
1545         if (altsubject_match) {
1546                 conn->altsubject_match = os_strdup(altsubject_match);
1547                 if (conn->altsubject_match == NULL)
1548                         return -1;
1549         }
1550
1551         return 0;
1552 }
1553
1554
1555 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
1556                               int verify_peer)
1557 {
1558         static int counter = 0;
1559
1560         if (conn == NULL)
1561                 return -1;
1562
1563         if (verify_peer) {
1564                 conn->ca_cert_verify = 1;
1565                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
1566                                SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
1567                                SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
1568         } else {
1569                 conn->ca_cert_verify = 0;
1570                 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
1571         }
1572
1573         SSL_set_accept_state(conn->ssl);
1574
1575         /*
1576          * Set session id context in order to avoid fatal errors when client
1577          * tries to resume a session. However, set the context to a unique
1578          * value in order to effectively disable session resumption for now
1579          * since not all areas of the server code are ready for it (e.g.,
1580          * EAP-TTLS needs special handling for Phase 2 after abbreviated TLS
1581          * handshake).
1582          */
1583         counter++;
1584         SSL_set_session_id_context(conn->ssl,
1585                                    (const unsigned char *) &counter,
1586                                    sizeof(counter));
1587
1588         return 0;
1589 }
1590
1591
1592 static int tls_connection_client_cert(struct tls_connection *conn,
1593                                       const char *client_cert,
1594                                       const u8 *client_cert_blob,
1595                                       size_t client_cert_blob_len)
1596 {
1597         if (client_cert == NULL && client_cert_blob == NULL)
1598                 return 0;
1599
1600         if (client_cert_blob &&
1601             SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
1602                                      client_cert_blob_len) == 1) {
1603                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
1604                            "OK");
1605                 return 0;
1606         } else if (client_cert_blob) {
1607                 tls_show_errors(MSG_DEBUG, __func__,
1608                                 "SSL_use_certificate_ASN1 failed");
1609         }
1610
1611         if (client_cert == NULL)
1612                 return -1;
1613
1614 #ifdef ANDROID
1615         if (os_strncmp("keystore://", client_cert, 11) == 0) {
1616                 BIO *bio = BIO_from_keystore(&client_cert[11]);
1617                 X509 *x509 = NULL;
1618                 int ret = -1;
1619                 if (bio) {
1620                         x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
1621                         BIO_free(bio);
1622                 }
1623                 if (x509) {
1624                         if (SSL_use_certificate(conn->ssl, x509) == 1)
1625                                 ret = 0;
1626                         X509_free(x509);
1627                 }
1628                 return ret;
1629         }
1630 #endif /* ANDROID */
1631
1632 #ifndef OPENSSL_NO_STDIO
1633         if (SSL_use_certificate_file(conn->ssl, client_cert,
1634                                      SSL_FILETYPE_ASN1) == 1) {
1635                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
1636                            " --> OK");
1637                 return 0;
1638         }
1639
1640         if (SSL_use_certificate_file(conn->ssl, client_cert,
1641                                      SSL_FILETYPE_PEM) == 1) {
1642                 ERR_clear_error();
1643                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
1644                            " --> OK");
1645                 return 0;
1646         }
1647
1648         tls_show_errors(MSG_DEBUG, __func__,
1649                         "SSL_use_certificate_file failed");
1650 #else /* OPENSSL_NO_STDIO */
1651         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1652 #endif /* OPENSSL_NO_STDIO */
1653
1654         return -1;
1655 }
1656
1657
1658 static int tls_global_client_cert(SSL_CTX *ssl_ctx, const char *client_cert)
1659 {
1660 #ifndef OPENSSL_NO_STDIO
1661         if (client_cert == NULL)
1662                 return 0;
1663
1664         if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1665                                          SSL_FILETYPE_ASN1) != 1 &&
1666             SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1667                                          SSL_FILETYPE_PEM) != 1) {
1668                 tls_show_errors(MSG_INFO, __func__,
1669                                 "Failed to load client certificate");
1670                 return -1;
1671         }
1672         return 0;
1673 #else /* OPENSSL_NO_STDIO */
1674         if (client_cert == NULL)
1675                 return 0;
1676         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1677         return -1;
1678 #endif /* OPENSSL_NO_STDIO */
1679 }
1680
1681
1682 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
1683 {
1684         if (password == NULL) {
1685                 return 0;
1686         }
1687         os_strlcpy(buf, (char *) password, size);
1688         return os_strlen(buf);
1689 }
1690
1691
1692 #ifdef PKCS12_FUNCS
1693 static int tls_parse_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, PKCS12 *p12,
1694                             const char *passwd)
1695 {
1696         EVP_PKEY *pkey;
1697         X509 *cert;
1698         STACK_OF(X509) *certs;
1699         int res = 0;
1700         char buf[256];
1701
1702         pkey = NULL;
1703         cert = NULL;
1704         certs = NULL;
1705         if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
1706                 tls_show_errors(MSG_DEBUG, __func__,
1707                                 "Failed to parse PKCS12 file");
1708                 PKCS12_free(p12);
1709                 return -1;
1710         }
1711         wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
1712
1713         if (cert) {
1714                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
1715                                   sizeof(buf));
1716                 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
1717                            "subject='%s'", buf);
1718                 if (ssl) {
1719                         if (SSL_use_certificate(ssl, cert) != 1)
1720                                 res = -1;
1721                 } else {
1722                         if (SSL_CTX_use_certificate(ssl_ctx, cert) != 1)
1723                                 res = -1;
1724                 }
1725                 X509_free(cert);
1726         }
1727
1728         if (pkey) {
1729                 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
1730                 if (ssl) {
1731                         if (SSL_use_PrivateKey(ssl, pkey) != 1)
1732                                 res = -1;
1733                 } else {
1734                         if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1)
1735                                 res = -1;
1736                 }
1737                 EVP_PKEY_free(pkey);
1738         }
1739
1740         if (certs) {
1741                 while ((cert = sk_X509_pop(certs)) != NULL) {
1742                         X509_NAME_oneline(X509_get_subject_name(cert), buf,
1743                                           sizeof(buf));
1744                         wpa_printf(MSG_DEBUG, "TLS: additional certificate"
1745                                    " from PKCS12: subject='%s'", buf);
1746                         /*
1747                          * There is no SSL equivalent for the chain cert - so
1748                          * always add it to the context...
1749                          */
1750                         if (SSL_CTX_add_extra_chain_cert(ssl_ctx, cert) != 1) {
1751                                 res = -1;
1752                                 break;
1753                         }
1754                 }
1755                 sk_X509_free(certs);
1756         }
1757
1758         PKCS12_free(p12);
1759
1760         if (res < 0)
1761                 tls_get_errors(ssl_ctx);
1762
1763         return res;
1764 }
1765 #endif  /* PKCS12_FUNCS */
1766
1767
1768 static int tls_read_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, const char *private_key,
1769                            const char *passwd)
1770 {
1771 #ifdef PKCS12_FUNCS
1772         FILE *f;
1773         PKCS12 *p12;
1774
1775         f = fopen(private_key, "rb");
1776         if (f == NULL)
1777                 return -1;
1778
1779         p12 = d2i_PKCS12_fp(f, NULL);
1780         fclose(f);
1781
1782         if (p12 == NULL) {
1783                 tls_show_errors(MSG_INFO, __func__,
1784                                 "Failed to use PKCS#12 file");
1785                 return -1;
1786         }
1787
1788         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1789
1790 #else /* PKCS12_FUNCS */
1791         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
1792                    "p12/pfx files");
1793         return -1;
1794 #endif  /* PKCS12_FUNCS */
1795 }
1796
1797
1798 static int tls_read_pkcs12_blob(SSL_CTX *ssl_ctx, SSL *ssl,
1799                                 const u8 *blob, size_t len, const char *passwd)
1800 {
1801 #ifdef PKCS12_FUNCS
1802         PKCS12 *p12;
1803
1804         p12 = d2i_PKCS12(NULL, (OPENSSL_d2i_TYPE) &blob, len);
1805         if (p12 == NULL) {
1806                 tls_show_errors(MSG_INFO, __func__,
1807                                 "Failed to use PKCS#12 blob");
1808                 return -1;
1809         }
1810
1811         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1812
1813 #else /* PKCS12_FUNCS */
1814         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
1815                    "p12/pfx blobs");
1816         return -1;
1817 #endif  /* PKCS12_FUNCS */
1818 }
1819
1820
1821 #ifndef OPENSSL_NO_ENGINE
1822 static int tls_engine_get_cert(struct tls_connection *conn,
1823                                const char *cert_id,
1824                                X509 **cert)
1825 {
1826         /* this runs after the private key is loaded so no PIN is required */
1827         struct {
1828                 const char *cert_id;
1829                 X509 *cert;
1830         } params;
1831         params.cert_id = cert_id;
1832         params.cert = NULL;
1833
1834         if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
1835                              0, &params, NULL, 1)) {
1836                 wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
1837                            " '%s' [%s]", cert_id,
1838                            ERR_error_string(ERR_get_error(), NULL));
1839                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1840         }
1841         if (!params.cert) {
1842                 wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
1843                            " '%s'", cert_id);
1844                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1845         }
1846         *cert = params.cert;
1847         return 0;
1848 }
1849 #endif /* OPENSSL_NO_ENGINE */
1850
1851
1852 static int tls_connection_engine_client_cert(struct tls_connection *conn,
1853                                              const char *cert_id)
1854 {
1855 #ifndef OPENSSL_NO_ENGINE
1856         X509 *cert;
1857
1858         if (tls_engine_get_cert(conn, cert_id, &cert))
1859                 return -1;
1860
1861         if (!SSL_use_certificate(conn->ssl, cert)) {
1862                 tls_show_errors(MSG_ERROR, __func__,
1863                                 "SSL_use_certificate failed");
1864                 X509_free(cert);
1865                 return -1;
1866         }
1867         X509_free(cert);
1868         wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
1869                    "OK");
1870         return 0;
1871
1872 #else /* OPENSSL_NO_ENGINE */
1873         return -1;
1874 #endif /* OPENSSL_NO_ENGINE */
1875 }
1876
1877
1878 static int tls_connection_engine_ca_cert(void *_ssl_ctx,
1879                                          struct tls_connection *conn,
1880                                          const char *ca_cert_id)
1881 {
1882 #ifndef OPENSSL_NO_ENGINE
1883         X509 *cert;
1884         SSL_CTX *ssl_ctx = _ssl_ctx;
1885
1886         if (tls_engine_get_cert(conn, ca_cert_id, &cert))
1887                 return -1;
1888
1889         /* start off the same as tls_connection_ca_cert */
1890         X509_STORE_free(ssl_ctx->cert_store);
1891         ssl_ctx->cert_store = X509_STORE_new();
1892         if (ssl_ctx->cert_store == NULL) {
1893                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1894                            "certificate store", __func__);
1895                 X509_free(cert);
1896                 return -1;
1897         }
1898         if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
1899                 unsigned long err = ERR_peek_error();
1900                 tls_show_errors(MSG_WARNING, __func__,
1901                                 "Failed to add CA certificate from engine "
1902                                 "to certificate store");
1903                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1904                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1905                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
1906                                    " already in hash table error",
1907                                    __func__);
1908                 } else {
1909                         X509_free(cert);
1910                         return -1;
1911                 }
1912         }
1913         X509_free(cert);
1914         wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
1915                    "to certificate store", __func__);
1916         SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1917         return 0;
1918
1919 #else /* OPENSSL_NO_ENGINE */
1920         return -1;
1921 #endif /* OPENSSL_NO_ENGINE */
1922 }
1923
1924
1925 static int tls_connection_engine_private_key(struct tls_connection *conn)
1926 {
1927 #ifndef OPENSSL_NO_ENGINE
1928         if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
1929                 tls_show_errors(MSG_ERROR, __func__,
1930                                 "ENGINE: cannot use private key for TLS");
1931                 return -1;
1932         }
1933         if (!SSL_check_private_key(conn->ssl)) {
1934                 tls_show_errors(MSG_INFO, __func__,
1935                                 "Private key failed verification");
1936                 return -1;
1937         }
1938         return 0;
1939 #else /* OPENSSL_NO_ENGINE */
1940         wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
1941                    "engine support was not compiled in");
1942         return -1;
1943 #endif /* OPENSSL_NO_ENGINE */
1944 }
1945
1946
1947 static int tls_connection_private_key(void *_ssl_ctx,
1948                                       struct tls_connection *conn,
1949                                       const char *private_key,
1950                                       const char *private_key_passwd,
1951                                       const u8 *private_key_blob,
1952                                       size_t private_key_blob_len)
1953 {
1954         SSL_CTX *ssl_ctx = _ssl_ctx;
1955         char *passwd;
1956         int ok;
1957
1958         if (private_key == NULL && private_key_blob == NULL)
1959                 return 0;
1960
1961         if (private_key_passwd) {
1962                 passwd = os_strdup(private_key_passwd);
1963                 if (passwd == NULL)
1964                         return -1;
1965         } else
1966                 passwd = NULL;
1967
1968         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
1969         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
1970
1971         ok = 0;
1972         while (private_key_blob) {
1973                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
1974                                             (u8 *) private_key_blob,
1975                                             private_key_blob_len) == 1) {
1976                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
1977                                    "ASN1(EVP_PKEY_RSA) --> OK");
1978                         ok = 1;
1979                         break;
1980                 }
1981
1982                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
1983                                             (u8 *) private_key_blob,
1984                                             private_key_blob_len) == 1) {
1985                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
1986                                    "ASN1(EVP_PKEY_DSA) --> OK");
1987                         ok = 1;
1988                         break;
1989                 }
1990
1991                 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
1992                                                (u8 *) private_key_blob,
1993                                                private_key_blob_len) == 1) {
1994                         wpa_printf(MSG_DEBUG, "OpenSSL: "
1995                                    "SSL_use_RSAPrivateKey_ASN1 --> OK");
1996                         ok = 1;
1997                         break;
1998                 }
1999
2000                 if (tls_read_pkcs12_blob(ssl_ctx, conn->ssl, private_key_blob,
2001                                          private_key_blob_len, passwd) == 0) {
2002                         wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
2003                                    "OK");
2004                         ok = 1;
2005                         break;
2006                 }
2007
2008                 break;
2009         }
2010
2011 #ifdef ANDROID
2012         if (!ok && private_key &&
2013             os_strncmp("keystore://", private_key, 11) == 0) {
2014                 BIO *bio = BIO_from_keystore(&private_key[11]);
2015                 EVP_PKEY *pkey = NULL;
2016                 if (bio) {
2017                         pkey = PEM_read_bio_PrivateKey(bio, NULL, NULL, NULL);
2018                         BIO_free(bio);
2019                 }
2020                 if (pkey) {
2021                         if (SSL_use_PrivateKey(conn->ssl, pkey) == 1) {
2022                                 wpa_printf(MSG_DEBUG, "OpenSSL: Private key "
2023                                            "from keystore");
2024                                 ok = 1;
2025                         }
2026                         EVP_PKEY_free(pkey);
2027                 }
2028         }
2029 #endif /* ANDROID */
2030
2031         while (!ok && private_key) {
2032 #ifndef OPENSSL_NO_STDIO
2033                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
2034                                             SSL_FILETYPE_ASN1) == 1) {
2035                         wpa_printf(MSG_DEBUG, "OpenSSL: "
2036                                    "SSL_use_PrivateKey_File (DER) --> OK");
2037                         ok = 1;
2038                         break;
2039                 }
2040
2041                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
2042                                             SSL_FILETYPE_PEM) == 1) {
2043                         wpa_printf(MSG_DEBUG, "OpenSSL: "
2044                                    "SSL_use_PrivateKey_File (PEM) --> OK");
2045                         ok = 1;
2046                         break;
2047                 }
2048 #else /* OPENSSL_NO_STDIO */
2049                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
2050                            __func__);
2051 #endif /* OPENSSL_NO_STDIO */
2052
2053                 if (tls_read_pkcs12(ssl_ctx, conn->ssl, private_key, passwd)
2054                     == 0) {
2055                         wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
2056                                    "--> OK");
2057                         ok = 1;
2058                         break;
2059                 }
2060
2061                 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
2062                         wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
2063                                    "access certificate store --> OK");
2064                         ok = 1;
2065                         break;
2066                 }
2067
2068                 break;
2069         }
2070
2071         if (!ok) {
2072                 tls_show_errors(MSG_INFO, __func__,
2073                                 "Failed to load private key");
2074                 os_free(passwd);
2075                 return -1;
2076         }
2077         ERR_clear_error();
2078         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2079         os_free(passwd);
2080
2081         if (!SSL_check_private_key(conn->ssl)) {
2082                 tls_show_errors(MSG_INFO, __func__, "Private key failed "
2083                                 "verification");
2084                 return -1;
2085         }
2086
2087         wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
2088         return 0;
2089 }
2090
2091
2092 static int tls_global_private_key(SSL_CTX *ssl_ctx, const char *private_key,
2093                                   const char *private_key_passwd)
2094 {
2095         char *passwd;
2096
2097         if (private_key == NULL)
2098                 return 0;
2099
2100         if (private_key_passwd) {
2101                 passwd = os_strdup(private_key_passwd);
2102                 if (passwd == NULL)
2103                         return -1;
2104         } else
2105                 passwd = NULL;
2106
2107         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
2108         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
2109         if (
2110 #ifndef OPENSSL_NO_STDIO
2111             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2112                                         SSL_FILETYPE_ASN1) != 1 &&
2113             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2114                                         SSL_FILETYPE_PEM) != 1 &&
2115 #endif /* OPENSSL_NO_STDIO */
2116             tls_read_pkcs12(ssl_ctx, NULL, private_key, passwd)) {
2117                 tls_show_errors(MSG_INFO, __func__,
2118                                 "Failed to load private key");
2119                 os_free(passwd);
2120                 ERR_clear_error();
2121                 return -1;
2122         }
2123         os_free(passwd);
2124         ERR_clear_error();
2125         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2126
2127         if (!SSL_CTX_check_private_key(ssl_ctx)) {
2128                 tls_show_errors(MSG_INFO, __func__,
2129                                 "Private key failed verification");
2130                 return -1;
2131         }
2132
2133         return 0;
2134 }
2135
2136
2137 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
2138 {
2139 #ifdef OPENSSL_NO_DH
2140         if (dh_file == NULL)
2141                 return 0;
2142         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2143                    "dh_file specified");
2144         return -1;
2145 #else /* OPENSSL_NO_DH */
2146         DH *dh;
2147         BIO *bio;
2148
2149         /* TODO: add support for dh_blob */
2150         if (dh_file == NULL)
2151                 return 0;
2152         if (conn == NULL)
2153                 return -1;
2154
2155         bio = BIO_new_file(dh_file, "r");
2156         if (bio == NULL) {
2157                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
2158                            dh_file, ERR_error_string(ERR_get_error(), NULL));
2159                 return -1;
2160         }
2161         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
2162         BIO_free(bio);
2163 #ifndef OPENSSL_NO_DSA
2164         while (dh == NULL) {
2165                 DSA *dsa;
2166                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
2167                            " trying to parse as DSA params", dh_file,
2168                            ERR_error_string(ERR_get_error(), NULL));
2169                 bio = BIO_new_file(dh_file, "r");
2170                 if (bio == NULL)
2171                         break;
2172                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
2173                 BIO_free(bio);
2174                 if (!dsa) {
2175                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
2176                                    "'%s': %s", dh_file,
2177                                    ERR_error_string(ERR_get_error(), NULL));
2178                         break;
2179                 }
2180
2181                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2182                 dh = DSA_dup_DH(dsa);
2183                 DSA_free(dsa);
2184                 if (dh == NULL) {
2185                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2186                                    "params into DH params");
2187                         break;
2188                 }
2189                 break;
2190         }
2191 #endif /* !OPENSSL_NO_DSA */
2192         if (dh == NULL) {
2193                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2194                            "'%s'", dh_file);
2195                 return -1;
2196         }
2197
2198         if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
2199                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2200                            "%s", dh_file,
2201                            ERR_error_string(ERR_get_error(), NULL));
2202                 DH_free(dh);
2203                 return -1;
2204         }
2205         DH_free(dh);
2206         return 0;
2207 #endif /* OPENSSL_NO_DH */
2208 }
2209
2210
2211 static int tls_global_dh(SSL_CTX *ssl_ctx, const char *dh_file)
2212 {
2213 #ifdef OPENSSL_NO_DH
2214         if (dh_file == NULL)
2215                 return 0;
2216         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2217                    "dh_file specified");
2218         return -1;
2219 #else /* OPENSSL_NO_DH */
2220         DH *dh;
2221         BIO *bio;
2222
2223         /* TODO: add support for dh_blob */
2224         if (dh_file == NULL)
2225                 return 0;
2226         if (ssl_ctx == NULL)
2227                 return -1;
2228
2229         bio = BIO_new_file(dh_file, "r");
2230         if (bio == NULL) {
2231                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
2232                            dh_file, ERR_error_string(ERR_get_error(), NULL));
2233                 return -1;
2234         }
2235         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
2236         BIO_free(bio);
2237 #ifndef OPENSSL_NO_DSA
2238         while (dh == NULL) {
2239                 DSA *dsa;
2240                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
2241                            " trying to parse as DSA params", dh_file,
2242                            ERR_error_string(ERR_get_error(), NULL));
2243                 bio = BIO_new_file(dh_file, "r");
2244                 if (bio == NULL)
2245                         break;
2246                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
2247                 BIO_free(bio);
2248                 if (!dsa) {
2249                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
2250                                    "'%s': %s", dh_file,
2251                                    ERR_error_string(ERR_get_error(), NULL));
2252                         break;
2253                 }
2254
2255                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2256                 dh = DSA_dup_DH(dsa);
2257                 DSA_free(dsa);
2258                 if (dh == NULL) {
2259                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2260                                    "params into DH params");
2261                         break;
2262                 }
2263                 break;
2264         }
2265 #endif /* !OPENSSL_NO_DSA */
2266         if (dh == NULL) {
2267                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2268                            "'%s'", dh_file);
2269                 return -1;
2270         }
2271
2272         if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
2273                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2274                            "%s", dh_file,
2275                            ERR_error_string(ERR_get_error(), NULL));
2276                 DH_free(dh);
2277                 return -1;
2278         }
2279         DH_free(dh);
2280         return 0;
2281 #endif /* OPENSSL_NO_DH */
2282 }
2283
2284
2285 int tls_connection_get_keys(void *ssl_ctx, struct tls_connection *conn,
2286                             struct tls_keys *keys)
2287 {
2288         SSL *ssl;
2289
2290         if (conn == NULL || keys == NULL)
2291                 return -1;
2292         ssl = conn->ssl;
2293         if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL)
2294                 return -1;
2295
2296         os_memset(keys, 0, sizeof(*keys));
2297         keys->master_key = ssl->session->master_key;
2298         keys->master_key_len = ssl->session->master_key_length;
2299         keys->client_random = ssl->s3->client_random;
2300         keys->client_random_len = SSL3_RANDOM_SIZE;
2301         keys->server_random = ssl->s3->server_random;
2302         keys->server_random_len = SSL3_RANDOM_SIZE;
2303
2304         return 0;
2305 }
2306
2307
2308 int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
2309                        const char *label, int server_random_first,
2310                        u8 *out, size_t out_len)
2311 {
2312         return -1;
2313 }
2314
2315
2316 static struct wpabuf *
2317 openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data,
2318                   int server)
2319 {
2320         int res;
2321         struct wpabuf *out_data;
2322
2323         /*
2324          * Give TLS handshake data from the server (if available) to OpenSSL
2325          * for processing.
2326          */
2327         if (in_data &&
2328             BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
2329             < 0) {
2330                 tls_show_errors(MSG_INFO, __func__,
2331                                 "Handshake failed - BIO_write");
2332                 return NULL;
2333         }
2334
2335         /* Initiate TLS handshake or continue the existing handshake */
2336         if (server)
2337                 res = SSL_accept(conn->ssl);
2338         else
2339                 res = SSL_connect(conn->ssl);
2340         if (res != 1) {
2341                 int err = SSL_get_error(conn->ssl, res);
2342                 if (err == SSL_ERROR_WANT_READ)
2343                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
2344                                    "more data");
2345                 else if (err == SSL_ERROR_WANT_WRITE)
2346                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
2347                                    "write");
2348                 else {
2349                         tls_show_errors(MSG_INFO, __func__, "SSL_connect");
2350                         conn->failed++;
2351                 }
2352         }
2353
2354         /* Get the TLS handshake data to be sent to the server */
2355         res = BIO_ctrl_pending(conn->ssl_out);
2356         wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
2357         out_data = wpabuf_alloc(res);
2358         if (out_data == NULL) {
2359                 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
2360                            "handshake output (%d bytes)", res);
2361                 if (BIO_reset(conn->ssl_out) < 0) {
2362                         tls_show_errors(MSG_INFO, __func__,
2363                                         "BIO_reset failed");
2364                 }
2365                 return NULL;
2366         }
2367         res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data),
2368                                       res);
2369         if (res < 0) {
2370                 tls_show_errors(MSG_INFO, __func__,
2371                                 "Handshake failed - BIO_read");
2372                 if (BIO_reset(conn->ssl_out) < 0) {
2373                         tls_show_errors(MSG_INFO, __func__,
2374                                         "BIO_reset failed");
2375                 }
2376                 wpabuf_free(out_data);
2377                 return NULL;
2378         }
2379         wpabuf_put(out_data, res);
2380
2381         return out_data;
2382 }
2383
2384
2385 static struct wpabuf *
2386 openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
2387 {
2388         struct wpabuf *appl_data;
2389         int res;
2390
2391         appl_data = wpabuf_alloc(max_len + 100);
2392         if (appl_data == NULL)
2393                 return NULL;
2394
2395         res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
2396                        wpabuf_size(appl_data));
2397         if (res < 0) {
2398                 int err = SSL_get_error(conn->ssl, res);
2399                 if (err == SSL_ERROR_WANT_READ ||
2400                     err == SSL_ERROR_WANT_WRITE) {
2401                         wpa_printf(MSG_DEBUG, "SSL: No Application Data "
2402                                    "included");
2403                 } else {
2404                         tls_show_errors(MSG_INFO, __func__,
2405                                         "Failed to read possible "
2406                                         "Application Data");
2407                 }
2408                 wpabuf_free(appl_data);
2409                 return NULL;
2410         }
2411
2412         wpabuf_put(appl_data, res);
2413         wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
2414                             "message", appl_data);
2415
2416         return appl_data;
2417 }
2418
2419
2420 static struct wpabuf *
2421 openssl_connection_handshake(struct tls_connection *conn,
2422                              const struct wpabuf *in_data,
2423                              struct wpabuf **appl_data, int server)
2424 {
2425         struct wpabuf *out_data;
2426
2427         if (appl_data)
2428                 *appl_data = NULL;
2429
2430         out_data = openssl_handshake(conn, in_data, server);
2431         if (out_data == NULL)
2432                 return NULL;
2433
2434         if (SSL_is_init_finished(conn->ssl) && appl_data && in_data)
2435                 *appl_data = openssl_get_appl_data(conn, wpabuf_len(in_data));
2436
2437         return out_data;
2438 }
2439
2440
2441 struct wpabuf *
2442 tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
2443                          const struct wpabuf *in_data,
2444                          struct wpabuf **appl_data)
2445 {
2446         return openssl_connection_handshake(conn, in_data, appl_data, 0);
2447 }
2448
2449
2450 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
2451                                                 struct tls_connection *conn,
2452                                                 const struct wpabuf *in_data,
2453                                                 struct wpabuf **appl_data)
2454 {
2455         return openssl_connection_handshake(conn, in_data, appl_data, 1);
2456 }
2457
2458
2459 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
2460                                        struct tls_connection *conn,
2461                                        const struct wpabuf *in_data)
2462 {
2463         int res;
2464         struct wpabuf *buf;
2465
2466         if (conn == NULL)
2467                 return NULL;
2468
2469         /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
2470         if ((res = BIO_reset(conn->ssl_in)) < 0 ||
2471             (res = BIO_reset(conn->ssl_out)) < 0) {
2472                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2473                 return NULL;
2474         }
2475         res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
2476         if (res < 0) {
2477                 tls_show_errors(MSG_INFO, __func__,
2478                                 "Encryption failed - SSL_write");
2479                 return NULL;
2480         }
2481
2482         /* Read encrypted data to be sent to the server */
2483         buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
2484         if (buf == NULL)
2485                 return NULL;
2486         res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
2487         if (res < 0) {
2488                 tls_show_errors(MSG_INFO, __func__,
2489                                 "Encryption failed - BIO_read");
2490                 wpabuf_free(buf);
2491                 return NULL;
2492         }
2493         wpabuf_put(buf, res);
2494
2495         return buf;
2496 }
2497
2498
2499 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
2500                                        struct tls_connection *conn,
2501                                        const struct wpabuf *in_data)
2502 {
2503         int res;
2504         struct wpabuf *buf;
2505
2506         /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
2507         res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
2508                         wpabuf_len(in_data));
2509         if (res < 0) {
2510                 tls_show_errors(MSG_INFO, __func__,
2511                                 "Decryption failed - BIO_write");
2512                 return NULL;
2513         }
2514         if (BIO_reset(conn->ssl_out) < 0) {
2515                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2516                 return NULL;
2517         }
2518
2519         /* Read decrypted data for further processing */
2520         /*
2521          * Even though we try to disable TLS compression, it is possible that
2522          * this cannot be done with all TLS libraries. Add extra buffer space
2523          * to handle the possibility of the decrypted data being longer than
2524          * input data.
2525          */
2526         buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
2527         if (buf == NULL)
2528                 return NULL;
2529         res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
2530         if (res < 0) {
2531                 tls_show_errors(MSG_INFO, __func__,
2532                                 "Decryption failed - SSL_read");
2533                 wpabuf_free(buf);
2534                 return NULL;
2535         }
2536         wpabuf_put(buf, res);
2537
2538         return buf;
2539 }
2540
2541
2542 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
2543 {
2544         return conn ? conn->ssl->hit : 0;
2545 }
2546
2547
2548 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
2549                                    u8 *ciphers)
2550 {
2551         char buf[100], *pos, *end;
2552         u8 *c;
2553         int ret;
2554
2555         if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
2556                 return -1;
2557
2558         buf[0] = '\0';
2559         pos = buf;
2560         end = pos + sizeof(buf);
2561
2562         c = ciphers;
2563         while (*c != TLS_CIPHER_NONE) {
2564                 const char *suite;
2565
2566                 switch (*c) {
2567                 case TLS_CIPHER_RC4_SHA:
2568                         suite = "RC4-SHA";
2569                         break;
2570                 case TLS_CIPHER_AES128_SHA:
2571                         suite = "AES128-SHA";
2572                         break;
2573                 case TLS_CIPHER_RSA_DHE_AES128_SHA:
2574                         suite = "DHE-RSA-AES128-SHA";
2575                         break;
2576                 case TLS_CIPHER_ANON_DH_AES128_SHA:
2577                         suite = "ADH-AES128-SHA";
2578                         break;
2579                 default:
2580                         wpa_printf(MSG_DEBUG, "TLS: Unsupported "
2581                                    "cipher selection: %d", *c);
2582                         return -1;
2583                 }
2584                 ret = os_snprintf(pos, end - pos, ":%s", suite);
2585                 if (ret < 0 || ret >= end - pos)
2586                         break;
2587                 pos += ret;
2588
2589                 c++;
2590         }
2591
2592         wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
2593
2594         if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
2595                 tls_show_errors(MSG_INFO, __func__,
2596                                 "Cipher suite configuration failed");
2597                 return -1;
2598         }
2599
2600         return 0;
2601 }
2602
2603
2604 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
2605                    char *buf, size_t buflen)
2606 {
2607         const char *name;
2608         if (conn == NULL || conn->ssl == NULL)
2609                 return -1;
2610
2611         name = SSL_get_cipher(conn->ssl);
2612         if (name == NULL)
2613                 return -1;
2614
2615         os_strlcpy(buf, name, buflen);
2616         return 0;
2617 }
2618
2619
2620 int tls_connection_enable_workaround(void *ssl_ctx,
2621                                      struct tls_connection *conn)
2622 {
2623         SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
2624
2625         return 0;
2626 }
2627
2628
2629 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2630 /* ClientHello TLS extensions require a patch to openssl, so this function is
2631  * commented out unless explicitly needed for EAP-FAST in order to be able to
2632  * build this file with unmodified openssl. */
2633 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
2634                                     int ext_type, const u8 *data,
2635                                     size_t data_len)
2636 {
2637         if (conn == NULL || conn->ssl == NULL || ext_type != 35)
2638                 return -1;
2639
2640 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2641         if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
2642                                        data_len) != 1)
2643                 return -1;
2644 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2645         if (SSL_set_hello_extension(conn->ssl, ext_type, (void *) data,
2646                                     data_len) != 1)
2647                 return -1;
2648 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2649
2650         return 0;
2651 }
2652 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2653
2654
2655 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
2656 {
2657         if (conn == NULL)
2658                 return -1;
2659         return conn->failed;
2660 }
2661
2662
2663 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
2664 {
2665         if (conn == NULL)
2666                 return -1;
2667         return conn->read_alerts;
2668 }
2669
2670
2671 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
2672 {
2673         if (conn == NULL)
2674                 return -1;
2675         return conn->write_alerts;
2676 }
2677
2678
2679 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
2680                               const struct tls_connection_params *params)
2681 {
2682         int ret;
2683         unsigned long err;
2684
2685         if (conn == NULL)
2686                 return -1;
2687
2688         while ((err = ERR_get_error())) {
2689                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2690                            __func__, ERR_error_string(err, NULL));
2691         }
2692
2693         if (params->engine) {
2694                 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
2695                 ret = tls_engine_init(conn, params->engine_id, params->pin,
2696                                       params->key_id, params->cert_id,
2697                                       params->ca_cert_id);
2698                 if (ret)
2699                         return ret;
2700         }
2701         if (tls_connection_set_subject_match(conn,
2702                                              params->subject_match,
2703                                              params->altsubject_match))
2704                 return -1;
2705
2706         if (params->engine && params->ca_cert_id) {
2707                 if (tls_connection_engine_ca_cert(tls_ctx, conn,
2708                                                   params->ca_cert_id))
2709                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2710         } else if (tls_connection_ca_cert(tls_ctx, conn, params->ca_cert,
2711                                           params->ca_cert_blob,
2712                                           params->ca_cert_blob_len,
2713                                           params->ca_path))
2714                 return -1;
2715
2716         if (params->engine && params->cert_id) {
2717                 if (tls_connection_engine_client_cert(conn, params->cert_id))
2718                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2719         } else if (tls_connection_client_cert(conn, params->client_cert,
2720                                               params->client_cert_blob,
2721                                               params->client_cert_blob_len))
2722                 return -1;
2723
2724         if (params->engine && params->key_id) {
2725                 wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
2726                 if (tls_connection_engine_private_key(conn))
2727                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2728         } else if (tls_connection_private_key(tls_ctx, conn,
2729                                               params->private_key,
2730                                               params->private_key_passwd,
2731                                               params->private_key_blob,
2732                                               params->private_key_blob_len)) {
2733                 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
2734                            params->private_key);
2735                 return -1;
2736         }
2737
2738         if (tls_connection_dh(conn, params->dh_file)) {
2739                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2740                            params->dh_file);
2741                 return -1;
2742         }
2743
2744         conn->flags = params->flags;
2745
2746         tls_get_errors(tls_ctx);
2747
2748         return 0;
2749 }
2750
2751
2752 int tls_global_set_params(void *tls_ctx,
2753                           const struct tls_connection_params *params)
2754 {
2755         SSL_CTX *ssl_ctx = tls_ctx;
2756         unsigned long err;
2757
2758         while ((err = ERR_get_error())) {
2759                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2760                            __func__, ERR_error_string(err, NULL));
2761         }
2762
2763         if (tls_global_ca_cert(ssl_ctx, params->ca_cert))
2764                 return -1;
2765
2766         if (tls_global_client_cert(ssl_ctx, params->client_cert))
2767                 return -1;
2768
2769         if (tls_global_private_key(ssl_ctx, params->private_key,
2770                                    params->private_key_passwd))
2771                 return -1;
2772
2773         if (tls_global_dh(ssl_ctx, params->dh_file)) {
2774                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2775                            params->dh_file);
2776                 return -1;
2777         }
2778
2779         return 0;
2780 }
2781
2782
2783 int tls_connection_get_keyblock_size(void *tls_ctx,
2784                                      struct tls_connection *conn)
2785 {
2786         const EVP_CIPHER *c;
2787         const EVP_MD *h;
2788
2789         if (conn == NULL || conn->ssl == NULL ||
2790             conn->ssl->enc_read_ctx == NULL ||
2791             conn->ssl->enc_read_ctx->cipher == NULL ||
2792             conn->ssl->read_hash == NULL)
2793                 return -1;
2794
2795         c = conn->ssl->enc_read_ctx->cipher;
2796 #if OPENSSL_VERSION_NUMBER >= 0x00909000L
2797         h = EVP_MD_CTX_md(conn->ssl->read_hash);
2798 #else
2799         h = conn->ssl->read_hash;
2800 #endif
2801
2802         return 2 * (EVP_CIPHER_key_length(c) +
2803                     EVP_MD_size(h) +
2804                     EVP_CIPHER_iv_length(c));
2805 }
2806
2807
2808 unsigned int tls_capabilities(void *tls_ctx)
2809 {
2810         return 0;
2811 }
2812
2813
2814 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2815 /* Pre-shared secred requires a patch to openssl, so this function is
2816  * commented out unless explicitly needed for EAP-FAST in order to be able to
2817  * build this file with unmodified openssl. */
2818
2819 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
2820                            STACK_OF(SSL_CIPHER) *peer_ciphers,
2821                            SSL_CIPHER **cipher, void *arg)
2822 {
2823         struct tls_connection *conn = arg;
2824         int ret;
2825
2826         if (conn == NULL || conn->session_ticket_cb == NULL)
2827                 return 0;
2828
2829         ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
2830                                       conn->session_ticket,
2831                                       conn->session_ticket_len,
2832                                       s->s3->client_random,
2833                                       s->s3->server_random, secret);
2834         os_free(conn->session_ticket);
2835         conn->session_ticket = NULL;
2836
2837         if (ret <= 0)
2838                 return 0;
2839
2840         *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
2841         return 1;
2842 }
2843
2844
2845 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2846 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
2847                                      int len, void *arg)
2848 {
2849         struct tls_connection *conn = arg;
2850
2851         if (conn == NULL || conn->session_ticket_cb == NULL)
2852                 return 0;
2853
2854         wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
2855
2856         os_free(conn->session_ticket);
2857         conn->session_ticket = NULL;
2858
2859         wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2860                     "extension", data, len);
2861
2862         conn->session_ticket = os_malloc(len);
2863         if (conn->session_ticket == NULL)
2864                 return 0;
2865
2866         os_memcpy(conn->session_ticket, data, len);
2867         conn->session_ticket_len = len;
2868
2869         return 1;
2870 }
2871 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2872 #ifdef SSL_OP_NO_TICKET
2873 static void tls_hello_ext_cb(SSL *s, int client_server, int type,
2874                              unsigned char *data, int len, void *arg)
2875 {
2876         struct tls_connection *conn = arg;
2877
2878         if (conn == NULL || conn->session_ticket_cb == NULL)
2879                 return;
2880
2881         wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2882                    type, len);
2883
2884         if (type == TLSEXT_TYPE_session_ticket && !client_server) {
2885                 os_free(conn->session_ticket);
2886                 conn->session_ticket = NULL;
2887
2888                 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2889                             "extension", data, len);
2890                 conn->session_ticket = os_malloc(len);
2891                 if (conn->session_ticket == NULL)
2892                         return;
2893
2894                 os_memcpy(conn->session_ticket, data, len);
2895                 conn->session_ticket_len = len;
2896         }
2897 }
2898 #else /* SSL_OP_NO_TICKET */
2899 static int tls_hello_ext_cb(SSL *s, TLS_EXTENSION *ext, void *arg)
2900 {
2901         struct tls_connection *conn = arg;
2902
2903         if (conn == NULL || conn->session_ticket_cb == NULL)
2904                 return 0;
2905
2906         wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2907                    ext->type, ext->length);
2908
2909         os_free(conn->session_ticket);
2910         conn->session_ticket = NULL;
2911
2912         if (ext->type == 35) {
2913                 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2914                             "extension", ext->data, ext->length);
2915                 conn->session_ticket = os_malloc(ext->length);
2916                 if (conn->session_ticket == NULL)
2917                         return SSL_AD_INTERNAL_ERROR;
2918
2919                 os_memcpy(conn->session_ticket, ext->data, ext->length);
2920                 conn->session_ticket_len = ext->length;
2921         }
2922
2923         return 0;
2924 }
2925 #endif /* SSL_OP_NO_TICKET */
2926 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2927 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2928
2929
2930 int tls_connection_set_session_ticket_cb(void *tls_ctx,
2931                                          struct tls_connection *conn,
2932                                          tls_session_ticket_cb cb,
2933                                          void *ctx)
2934 {
2935 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2936         conn->session_ticket_cb = cb;
2937         conn->session_ticket_cb_ctx = ctx;
2938
2939         if (cb) {
2940                 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
2941                                               conn) != 1)
2942                         return -1;
2943 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2944                 SSL_set_session_ticket_ext_cb(conn->ssl,
2945                                               tls_session_ticket_ext_cb, conn);
2946 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2947 #ifdef SSL_OP_NO_TICKET
2948                 SSL_set_tlsext_debug_callback(conn->ssl, tls_hello_ext_cb);
2949                 SSL_set_tlsext_debug_arg(conn->ssl, conn);
2950 #else /* SSL_OP_NO_TICKET */
2951                 if (SSL_set_hello_extension_cb(conn->ssl, tls_hello_ext_cb,
2952                                                conn) != 1)
2953                         return -1;
2954 #endif /* SSL_OP_NO_TICKET */
2955 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2956         } else {
2957                 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
2958                         return -1;
2959 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2960                 SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
2961 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2962 #ifdef SSL_OP_NO_TICKET
2963                 SSL_set_tlsext_debug_callback(conn->ssl, NULL);
2964                 SSL_set_tlsext_debug_arg(conn->ssl, conn);
2965 #else /* SSL_OP_NO_TICKET */
2966                 if (SSL_set_hello_extension_cb(conn->ssl, NULL, NULL) != 1)
2967                         return -1;
2968 #endif /* SSL_OP_NO_TICKET */
2969 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2970         }
2971
2972         return 0;
2973 #else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2974         return -1;
2975 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2976 }