contrib/wpa/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 software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #ifndef CONFIG_SMARTCARD
  12 #ifndef OPENSSL_NO_ENGINE
  13 #define OPENSSL_NO_ENGINE
  14 #endif
  15 #endif
  16
  17 #include <openssl/ssl.h>
  18 #include <openssl/err.h>
  19 #include <openssl/pkcs12.h>
  20 #include <openssl/x509v3.h>
  21 #ifndef OPENSSL_NO_ENGINE
  22 #include <openssl/engine.h>
  23 #endif /* OPENSSL_NO_ENGINE */
  24
  25 #ifdef ANDROID
  26 #include <openssl/pem.h>
  27 #include "keystore_get.h"
  28 #endif /* ANDROID */
  29
  30 #include "common.h"
  31 #include "crypto.h"
  32 #include "tls.h"
  33
  34 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
  35 #define OPENSSL_d2i_TYPE const unsigned char **
  36 #else
  37 #define OPENSSL_d2i_TYPE unsigned char **
  38 #endif
  39
  40 #ifdef SSL_F_SSL_SET_SESSION_TICKET_EXT
  41 #ifdef SSL_OP_NO_TICKET
  42 /*
  43  * Session ticket override patch was merged into OpenSSL 0.9.9 tree on
  44  * 2008-11-15. This version uses a bit different API compared to the old patch.
  45  */
  46 #define CONFIG_OPENSSL_TICKET_OVERRIDE
  47 #endif
  48 #endif
  49
  50 static int tls_openssl_ref_count = 0;
  51
  52 struct tls_global {
  53         void (*event_cb)(void *ctx, enum tls_event ev,
  54                          union tls_event_data *data);
  55         void *cb_ctx;
  56         int cert_in_cb;
  57 };
  58
  59 static struct tls_global *tls_global = NULL;
  60
  61
  62 struct tls_connection {
  63         SSL *ssl;
  64         BIO *ssl_in, *ssl_out;
  65 #ifndef OPENSSL_NO_ENGINE
  66         ENGINE *engine;        /* functional reference to the engine */
  67         EVP_PKEY *private_key; /* the private key if using engine */
  68 #endif /* OPENSSL_NO_ENGINE */
  69         char *subject_match, *altsubject_match;
  70         int read_alerts, write_alerts, failed;
  71
  72         tls_session_ticket_cb session_ticket_cb;
  73         void *session_ticket_cb_ctx;
  74
  75         /* SessionTicket received from OpenSSL hello_extension_cb (server) */
  76         u8 *session_ticket;
  77         size_t session_ticket_len;
  78
  79         unsigned int ca_cert_verify:1;
  80         unsigned int cert_probe:1;
  81         unsigned int server_cert_only:1;
  82
  83         u8 srv_cert_hash[32];
  84
  85         unsigned int flags;
  86 };
  87
  88
  89 #ifdef CONFIG_NO_STDOUT_DEBUG
  90
  91 static void _tls_show_errors(void)
  92 {
  93         unsigned long err;
  94
  95         while ((err = ERR_get_error())) {
  96                 /* Just ignore the errors, since stdout is disabled */
  97         }
  98 }
  99 #define tls_show_errors(l, f, t) _tls_show_errors()
 100
 101 #else /* CONFIG_NO_STDOUT_DEBUG */
 102
 103 static void tls_show_errors(int level, const char *func, const char *txt)
 104 {
 105         unsigned long err;
 106
 107         wpa_printf(level, "OpenSSL: %s - %s %s",
 108                    func, txt, ERR_error_string(ERR_get_error(), NULL));
 109
 110         while ((err = ERR_get_error())) {
 111                 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
 112                            ERR_error_string(err, NULL));
 113         }
 114 }
 115
 116 #endif /* CONFIG_NO_STDOUT_DEBUG */
 117
 118
 119 #ifdef CONFIG_NATIVE_WINDOWS
 120
 121 /* Windows CryptoAPI and access to certificate stores */
 122 #include <wincrypt.h>
 123
 124 #ifdef __MINGW32_VERSION
 125 /*
 126  * MinGW does not yet include all the needed definitions for CryptoAPI, so
 127  * define here whatever extra is needed.
 128  */
 129 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
 130 #define CERT_STORE_READONLY_FLAG 0x00008000
 131 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
 132
 133 #endif /* __MINGW32_VERSION */
 134
 135
 136 struct cryptoapi_rsa_data {
 137         const CERT_CONTEXT *cert;
 138         HCRYPTPROV crypt_prov;
 139         DWORD key_spec;
 140         BOOL free_crypt_prov;
 141 };
 142
 143
 144 static void cryptoapi_error(const char *msg)
 145 {
 146         wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
 147                    msg, (unsigned int) GetLastError());
 148 }
 149
 150
 151 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
 152                                  unsigned char *to, RSA *rsa, int padding)
 153 {
 154         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 155         return 0;
 156 }
 157
 158
 159 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
 160                                  unsigned char *to, RSA *rsa, int padding)
 161 {
 162         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 163         return 0;
 164 }
 165
 166
 167 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
 168                                   unsigned char *to, RSA *rsa, int padding)
 169 {
 170         struct cryptoapi_rsa_data *priv =
 171                 (struct cryptoapi_rsa_data *) rsa->meth->app_data;
 172         HCRYPTHASH hash;
 173         DWORD hash_size, len, i;
 174         unsigned char *buf = NULL;
 175         int ret = 0;
 176
 177         if (priv == NULL) {
 178                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 179                        ERR_R_PASSED_NULL_PARAMETER);
 180                 return 0;
 181         }
 182
 183         if (padding != RSA_PKCS1_PADDING) {
 184                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 185                        RSA_R_UNKNOWN_PADDING_TYPE);
 186                 return 0;
 187         }
 188
 189         if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
 190                 wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
 191                            __func__);
 192                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 193                        RSA_R_INVALID_MESSAGE_LENGTH);
 194                 return 0;
 195         }
 196
 197         if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
 198         {
 199                 cryptoapi_error("CryptCreateHash failed");
 200                 return 0;
 201         }
 202
 203         len = sizeof(hash_size);
 204         if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
 205                                0)) {
 206                 cryptoapi_error("CryptGetHashParam failed");
 207                 goto err;
 208         }
 209
 210         if ((int) hash_size != flen) {
 211                 wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
 212                            (unsigned) hash_size, flen);
 213                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 214                        RSA_R_INVALID_MESSAGE_LENGTH);
 215                 goto err;
 216         }
 217         if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
 218                 cryptoapi_error("CryptSetHashParam failed");
 219                 goto err;
 220         }
 221
 222         len = RSA_size(rsa);
 223         buf = os_malloc(len);
 224         if (buf == NULL) {
 225                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
 226                 goto err;
 227         }
 228
 229         if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
 230                 cryptoapi_error("CryptSignHash failed");
 231                 goto err;
 232         }
 233
 234         for (i = 0; i < len; i++)
 235                 to[i] = buf[len - i - 1];
 236         ret = len;
 237
 238 err:
 239         os_free(buf);
 240         CryptDestroyHash(hash);
 241
 242         return ret;
 243 }
 244
 245
 246 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
 247                                   unsigned char *to, RSA *rsa, int padding)
 248 {
 249         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 250         return 0;
 251 }
 252
 253
 254 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
 255 {
 256         if (priv == NULL)
 257                 return;
 258         if (priv->crypt_prov && priv->free_crypt_prov)
 259                 CryptReleaseContext(priv->crypt_prov, 0);
 260         if (priv->cert)
 261                 CertFreeCertificateContext(priv->cert);
 262         os_free(priv);
 263 }
 264
 265
 266 static int cryptoapi_finish(RSA *rsa)
 267 {
 268         cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
 269         os_free((void *) rsa->meth);
 270         rsa->meth = NULL;
 271         return 1;
 272 }
 273
 274
 275 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
 276 {
 277         HCERTSTORE cs;
 278         const CERT_CONTEXT *ret = NULL;
 279
 280         cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
 281                            store | CERT_STORE_OPEN_EXISTING_FLAG |
 282                            CERT_STORE_READONLY_FLAG, L"MY");
 283         if (cs == NULL) {
 284                 cryptoapi_error("Failed to open 'My system store'");
 285                 return NULL;
 286         }
 287
 288         if (strncmp(name, "cert://", 7) == 0) {
 289                 unsigned short wbuf[255];
 290                 MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
 291                 ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
 292                                                  PKCS_7_ASN_ENCODING,
 293                                                  0, CERT_FIND_SUBJECT_STR,
 294                                                  wbuf, NULL);
 295         } else if (strncmp(name, "hash://", 7) == 0) {
 296                 CRYPT_HASH_BLOB blob;
 297                 int len;
 298                 const char *hash = name + 7;
 299                 unsigned char *buf;
 300
 301                 len = os_strlen(hash) / 2;
 302                 buf = os_malloc(len);
 303                 if (buf && hexstr2bin(hash, buf, len) == 0) {
 304                         blob.cbData = len;
 305                         blob.pbData = buf;
 306                         ret = CertFindCertificateInStore(cs,
 307                                                          X509_ASN_ENCODING |
 308                                                          PKCS_7_ASN_ENCODING,
 309                                                          0, CERT_FIND_HASH,
 310                                                          &blob, NULL);
 311                 }
 312                 os_free(buf);
 313         }
 314
 315         CertCloseStore(cs, 0);
 316
 317         return ret;
 318 }
 319
 320
 321 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 322 {
 323         X509 *cert = NULL;
 324         RSA *rsa = NULL, *pub_rsa;
 325         struct cryptoapi_rsa_data *priv;
 326         RSA_METHOD *rsa_meth;
 327
 328         if (name == NULL ||
 329             (strncmp(name, "cert://", 7) != 0 &&
 330              strncmp(name, "hash://", 7) != 0))
 331                 return -1;
 332
 333         priv = os_zalloc(sizeof(*priv));
 334         rsa_meth = os_zalloc(sizeof(*rsa_meth));
 335         if (priv == NULL || rsa_meth == NULL) {
 336                 wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
 337                            "for CryptoAPI RSA method");
 338                 os_free(priv);
 339                 os_free(rsa_meth);
 340                 return -1;
 341         }
 342
 343         priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
 344         if (priv->cert == NULL) {
 345                 priv->cert = cryptoapi_find_cert(
 346                         name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
 347         }
 348         if (priv->cert == NULL) {
 349                 wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
 350                            "'%s'", name);
 351                 goto err;
 352         }
 353
 354         cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &priv->cert->pbCertEncoded,
 355                         priv->cert->cbCertEncoded);
 356         if (cert == NULL) {
 357                 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
 358                            "encoding");
 359                 goto err;
 360         }
 361
 362         if (!CryptAcquireCertificatePrivateKey(priv->cert,
 363                                                CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
 364                                                NULL, &priv->crypt_prov,
 365                                                &priv->key_spec,
 366                                                &priv->free_crypt_prov)) {
 367                 cryptoapi_error("Failed to acquire a private key for the "
 368                                 "certificate");
 369                 goto err;
 370         }
 371
 372         rsa_meth->name = "Microsoft CryptoAPI RSA Method";
 373         rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
 374         rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
 375         rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
 376         rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
 377         rsa_meth->finish = cryptoapi_finish;
 378         rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
 379         rsa_meth->app_data = (char *) priv;
 380
 381         rsa = RSA_new();
 382         if (rsa == NULL) {
 383                 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
 384                        ERR_R_MALLOC_FAILURE);
 385                 goto err;
 386         }
 387
 388         if (!SSL_use_certificate(ssl, cert)) {
 389                 RSA_free(rsa);
 390                 rsa = NULL;
 391                 goto err;
 392         }
 393         pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
 394         X509_free(cert);
 395         cert = NULL;
 396
 397         rsa->n = BN_dup(pub_rsa->n);
 398         rsa->e = BN_dup(pub_rsa->e);
 399         if (!RSA_set_method(rsa, rsa_meth))
 400                 goto err;
 401
 402         if (!SSL_use_RSAPrivateKey(ssl, rsa))
 403                 goto err;
 404         RSA_free(rsa);
 405
 406         return 0;
 407
 408 err:
 409         if (cert)
 410                 X509_free(cert);
 411         if (rsa)
 412                 RSA_free(rsa);
 413         else {
 414                 os_free(rsa_meth);
 415                 cryptoapi_free_data(priv);
 416         }
 417         return -1;
 418 }
 419
 420
 421 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
 422 {
 423         HCERTSTORE cs;
 424         PCCERT_CONTEXT ctx = NULL;
 425         X509 *cert;
 426         char buf[128];
 427         const char *store;
 428 #ifdef UNICODE
 429         WCHAR *wstore;
 430 #endif /* UNICODE */
 431
 432         if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
 433                 return -1;
 434
 435         store = name + 13;
 436 #ifdef UNICODE
 437         wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
 438         if (wstore == NULL)
 439                 return -1;
 440         wsprintf(wstore, L"%S", store);
 441         cs = CertOpenSystemStore(0, wstore);
 442         os_free(wstore);
 443 #else /* UNICODE */
 444         cs = CertOpenSystemStore(0, store);
 445 #endif /* UNICODE */
 446         if (cs == NULL) {
 447                 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
 448                            "'%s': error=%d", __func__, store,
 449                            (int) GetLastError());
 450                 return -1;
 451         }
 452
 453         while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
 454                 cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ctx->pbCertEncoded,
 455                                 ctx->cbCertEncoded);
 456                 if (cert == NULL) {
 457                         wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
 458                                    "X509 DER encoding for CA cert");
 459                         continue;
 460                 }
 461
 462                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
 463                                   sizeof(buf));
 464                 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
 465                            "system certificate store: subject='%s'", buf);
 466
 467                 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
 468                         tls_show_errors(MSG_WARNING, __func__,
 469                                         "Failed to add ca_cert to OpenSSL "
 470                                         "certificate store");
 471                 }
 472
 473                 X509_free(cert);
 474         }
 475
 476         if (!CertCloseStore(cs, 0)) {
 477                 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
 478                            "'%s': error=%d", __func__, name + 13,
 479                            (int) GetLastError());
 480         }
 481
 482         return 0;
 483 }
 484
 485
 486 #else /* CONFIG_NATIVE_WINDOWS */
 487
 488 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 489 {
 490         return -1;
 491 }
 492
 493 #endif /* CONFIG_NATIVE_WINDOWS */
 494
 495
 496 static void ssl_info_cb(const SSL *ssl, int where, int ret)
 497 {
 498         const char *str;
 499         int w;
 500
 501         wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
 502         w = where & ~SSL_ST_MASK;
 503         if (w & SSL_ST_CONNECT)
 504                 str = "SSL_connect";
 505         else if (w & SSL_ST_ACCEPT)
 506                 str = "SSL_accept";
 507         else
 508                 str = "undefined";
 509
 510         if (where & SSL_CB_LOOP) {
 511                 wpa_printf(MSG_DEBUG, "SSL: %s:%s",
 512                            str, SSL_state_string_long(ssl));
 513         } else if (where & SSL_CB_ALERT) {
 514                 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
 515                            where & SSL_CB_READ ?
 516                            "read (remote end reported an error)" :
 517                            "write (local SSL3 detected an error)",
 518                            SSL_alert_type_string_long(ret),
 519                            SSL_alert_desc_string_long(ret));
 520                 if ((ret >> 8) == SSL3_AL_FATAL) {
 521                         struct tls_connection *conn =
 522                                 SSL_get_app_data((SSL *) ssl);
 523                         if (where & SSL_CB_READ)
 524                                 conn->read_alerts++;
 525                         else
 526                                 conn->write_alerts++;
 527                 }
 528                 if (tls_global->event_cb != NULL) {
 529                         union tls_event_data ev;
 530                         os_memset(&ev, 0, sizeof(ev));
 531                         ev.alert.is_local = !(where & SSL_CB_READ);
 532                         ev.alert.type = SSL_alert_type_string_long(ret);
 533                         ev.alert.description = SSL_alert_desc_string_long(ret);
 534                         tls_global->event_cb(tls_global->cb_ctx, TLS_ALERT,
 535                                              &ev);
 536                 }
 537         } else if (where & SSL_CB_EXIT && ret <= 0) {
 538                 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
 539                            str, ret == 0 ? "failed" : "error",
 540                            SSL_state_string_long(ssl));
 541         }
 542 }
 543
 544
 545 #ifndef OPENSSL_NO_ENGINE
 546 /**
 547  * tls_engine_load_dynamic_generic - load any openssl engine
 548  * @pre: an array of commands and values that load an engine initialized
 549  *       in the engine specific function
 550  * @post: an array of commands and values that initialize an already loaded
 551  *        engine (or %NULL if not required)
 552  * @id: the engine id of the engine to load (only required if post is not %NULL
 553  *
 554  * This function is a generic function that loads any openssl engine.
 555  *
 556  * Returns: 0 on success, -1 on failure
 557  */
 558 static int tls_engine_load_dynamic_generic(const char *pre[],
 559                                            const char *post[], const char *id)
 560 {
 561         ENGINE *engine;
 562         const char *dynamic_id = "dynamic";
 563
 564         engine = ENGINE_by_id(id);
 565         if (engine) {
 566                 ENGINE_free(engine);
 567                 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
 568                            "available", id);
 569                 return 0;
 570         }
 571         ERR_clear_error();
 572
 573         engine = ENGINE_by_id(dynamic_id);
 574         if (engine == NULL) {
 575                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 576                            dynamic_id,
 577                            ERR_error_string(ERR_get_error(), NULL));
 578                 return -1;
 579         }
 580
 581         /* Perform the pre commands. This will load the engine. */
 582         while (pre && pre[0]) {
 583                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
 584                 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
 585                         wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
 586                                    "%s %s [%s]", pre[0], pre[1],
 587                                    ERR_error_string(ERR_get_error(), NULL));
 588                         ENGINE_free(engine);
 589                         return -1;
 590                 }
 591                 pre += 2;
 592         }
 593
 594         /*
 595          * Free the reference to the "dynamic" engine. The loaded engine can
 596          * now be looked up using ENGINE_by_id().
 597          */
 598         ENGINE_free(engine);
 599
 600         engine = ENGINE_by_id(id);
 601         if (engine == NULL) {
 602                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 603                            id, ERR_error_string(ERR_get_error(), NULL));
 604                 return -1;
 605         }
 606
 607         while (post && post[0]) {
 608                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
 609                 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
 610                         wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
 611                                 " %s %s [%s]", post[0], post[1],
 612                                    ERR_error_string(ERR_get_error(), NULL));
 613                         ENGINE_remove(engine);
 614                         ENGINE_free(engine);
 615                         return -1;
 616                 }
 617                 post += 2;
 618         }
 619         ENGINE_free(engine);
 620
 621         return 0;
 622 }
 623
 624
 625 /**
 626  * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
 627  * @pkcs11_so_path: pksc11_so_path from the configuration
 628  * @pcks11_module_path: pkcs11_module_path from the configuration
 629  */
 630 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
 631                                           const char *pkcs11_module_path)
 632 {
 633         char *engine_id = "pkcs11";
 634         const char *pre_cmd[] = {
 635                 "SO_PATH", NULL /* pkcs11_so_path */,
 636                 "ID", NULL /* engine_id */,
 637                 "LIST_ADD", "1",
 638                 /* "NO_VCHECK", "1", */
 639                 "LOAD", NULL,
 640                 NULL, NULL
 641         };
 642         const char *post_cmd[] = {
 643                 "MODULE_PATH", NULL /* pkcs11_module_path */,
 644                 NULL, NULL
 645         };
 646
 647         if (!pkcs11_so_path || !pkcs11_module_path)
 648                 return 0;
 649
 650         pre_cmd[1] = pkcs11_so_path;
 651         pre_cmd[3] = engine_id;
 652         post_cmd[1] = pkcs11_module_path;
 653
 654         wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
 655                    pkcs11_so_path);
 656
 657         return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
 658 }
 659
 660
 661 /**
 662  * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
 663  * @opensc_so_path: opensc_so_path from the configuration
 664  */
 665 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
 666 {
 667         char *engine_id = "opensc";
 668         const char *pre_cmd[] = {
 669                 "SO_PATH", NULL /* opensc_so_path */,
 670                 "ID", NULL /* engine_id */,
 671                 "LIST_ADD", "1",
 672                 "LOAD", NULL,
 673                 NULL, NULL
 674         };
 675
 676         if (!opensc_so_path)
 677                 return 0;
 678
 679         pre_cmd[1] = opensc_so_path;
 680         pre_cmd[3] = engine_id;
 681
 682         wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
 683                    opensc_so_path);
 684
 685         return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
 686 }
 687 #endif /* OPENSSL_NO_ENGINE */
 688
 689
 690 void * tls_init(const struct tls_config *conf)
 691 {
 692         SSL_CTX *ssl;
 693
 694         if (tls_openssl_ref_count == 0) {
 695                 tls_global = os_zalloc(sizeof(*tls_global));
 696                 if (tls_global == NULL)
 697                         return NULL;
 698                 if (conf) {
 699                         tls_global->event_cb = conf->event_cb;
 700                         tls_global->cb_ctx = conf->cb_ctx;
 701                         tls_global->cert_in_cb = conf->cert_in_cb;
 702                 }
 703
 704 #ifdef CONFIG_FIPS
 705 #ifdef OPENSSL_FIPS
 706                 if (conf && conf->fips_mode) {
 707                         if (!FIPS_mode_set(1)) {
 708                                 wpa_printf(MSG_ERROR, "Failed to enable FIPS "
 709                                            "mode");
 710                                 ERR_load_crypto_strings();
 711                                 ERR_print_errors_fp(stderr);
 712                                 os_free(tls_global);
 713                                 tls_global = NULL;
 714                                 return NULL;
 715                         } else
 716                                 wpa_printf(MSG_INFO, "Running in FIPS mode");
 717                 }
 718 #else /* OPENSSL_FIPS */
 719                 if (conf && conf->fips_mode) {
 720                         wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
 721                                    "supported");
 722                         os_free(tls_global);
 723                         tls_global = NULL;
 724                         return NULL;
 725                 }
 726 #endif /* OPENSSL_FIPS */
 727 #endif /* CONFIG_FIPS */
 728                 SSL_load_error_strings();
 729                 SSL_library_init();
 730 #if (OPENSSL_VERSION_NUMBER >= 0x0090800fL) && !defined(OPENSSL_NO_SHA256)
 731                 EVP_add_digest(EVP_sha256());
 732 #endif /* OPENSSL_NO_SHA256 */
 733                 /* TODO: if /dev/urandom is available, PRNG is seeded
 734                  * automatically. If this is not the case, random data should
 735                  * be added here. */
 736
 737 #ifdef PKCS12_FUNCS
 738 #ifndef OPENSSL_NO_RC2
 739                 /*
 740                  * 40-bit RC2 is commonly used in PKCS#12 files, so enable it.
 741                  * This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8
 742                  * versions, but it looks like OpenSSL 1.0.0 does not do that
 743                  * anymore.
 744                  */
 745                 EVP_add_cipher(EVP_rc2_40_cbc());
 746 #endif /* OPENSSL_NO_RC2 */
 747                 PKCS12_PBE_add();
 748 #endif  /* PKCS12_FUNCS */
 749         }
 750         tls_openssl_ref_count++;
 751
 752         ssl = SSL_CTX_new(TLSv1_method());
 753         if (ssl == NULL)
 754                 return NULL;
 755
 756         SSL_CTX_set_info_callback(ssl, ssl_info_cb);
 757
 758 #ifndef OPENSSL_NO_ENGINE
 759         if (conf &&
 760             (conf->opensc_engine_path || conf->pkcs11_engine_path ||
 761              conf->pkcs11_module_path)) {
 762                 wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
 763                 ERR_load_ENGINE_strings();
 764                 ENGINE_load_dynamic();
 765
 766                 if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
 767                     tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
 768                                                    conf->pkcs11_module_path)) {
 769                         tls_deinit(ssl);
 770                         return NULL;
 771                 }
 772         }
 773 #endif /* OPENSSL_NO_ENGINE */
 774
 775         return ssl;
 776 }
 777
 778
 779 void tls_deinit(void *ssl_ctx)
 780 {
 781         SSL_CTX *ssl = ssl_ctx;
 782         SSL_CTX_free(ssl);
 783
 784         tls_openssl_ref_count--;
 785         if (tls_openssl_ref_count == 0) {
 786 #ifndef OPENSSL_NO_ENGINE
 787                 ENGINE_cleanup();
 788 #endif /* OPENSSL_NO_ENGINE */
 789                 CRYPTO_cleanup_all_ex_data();
 790                 ERR_remove_state(0);
 791                 ERR_free_strings();
 792                 EVP_cleanup();
 793                 os_free(tls_global);
 794                 tls_global = NULL;
 795         }
 796 }
 797
 798
 799 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
 800                            const char *pin, const char *key_id,
 801                            const char *cert_id, const char *ca_cert_id)
 802 {
 803 #ifndef OPENSSL_NO_ENGINE
 804         int ret = -1;
 805         if (engine_id == NULL) {
 806                 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
 807                 return -1;
 808         }
 809         if (pin == NULL) {
 810                 wpa_printf(MSG_ERROR, "ENGINE: Smartcard PIN not set");
 811                 return -1;
 812         }
 813         if (key_id == NULL) {
 814                 wpa_printf(MSG_ERROR, "ENGINE: Key Id not set");
 815                 return -1;
 816         }
 817
 818         ERR_clear_error();
 819         conn->engine = ENGINE_by_id(engine_id);
 820         if (!conn->engine) {
 821                 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
 822                            engine_id, ERR_error_string(ERR_get_error(), NULL));
 823                 goto err;
 824         }
 825         if (ENGINE_init(conn->engine) != 1) {
 826                 wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
 827                            "(engine: %s) [%s]", engine_id,
 828                            ERR_error_string(ERR_get_error(), NULL));
 829                 goto err;
 830         }
 831         wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
 832
 833         if (ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
 834                 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
 835                            ERR_error_string(ERR_get_error(), NULL));
 836                 goto err;
 837         }
 838         /* load private key first in-case PIN is required for cert */
 839         conn->private_key = ENGINE_load_private_key(conn->engine,
 840                                                     key_id, NULL, NULL);
 841         if (!conn->private_key) {
 842                 wpa_printf(MSG_ERROR, "ENGINE: cannot load private key with id"
 843                                 " '%s' [%s]", key_id,
 844                            ERR_error_string(ERR_get_error(), NULL));
 845                 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
 846                 goto err;
 847         }
 848
 849         /* handle a certificate and/or CA certificate */
 850         if (cert_id || ca_cert_id) {
 851                 const char *cmd_name = "LOAD_CERT_CTRL";
 852
 853                 /* test if the engine supports a LOAD_CERT_CTRL */
 854                 if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
 855                                  0, (void *)cmd_name, NULL)) {
 856                         wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
 857                                    " loading certificates");
 858                         ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
 859                         goto err;
 860                 }
 861         }
 862
 863         return 0;
 864
 865 err:
 866         if (conn->engine) {
 867                 ENGINE_free(conn->engine);
 868                 conn->engine = NULL;
 869         }
 870
 871         if (conn->private_key) {
 872                 EVP_PKEY_free(conn->private_key);
 873                 conn->private_key = NULL;
 874         }
 875
 876         return ret;
 877 #else /* OPENSSL_NO_ENGINE */
 878         return 0;
 879 #endif /* OPENSSL_NO_ENGINE */
 880 }
 881
 882
 883 static void tls_engine_deinit(struct tls_connection *conn)
 884 {
 885 #ifndef OPENSSL_NO_ENGINE
 886         wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
 887         if (conn->private_key) {
 888                 EVP_PKEY_free(conn->private_key);
 889                 conn->private_key = NULL;
 890         }
 891         if (conn->engine) {
 892                 ENGINE_finish(conn->engine);
 893                 conn->engine = NULL;
 894         }
 895 #endif /* OPENSSL_NO_ENGINE */
 896 }
 897
 898
 899 int tls_get_errors(void *ssl_ctx)
 900 {
 901         int count = 0;
 902         unsigned long err;
 903
 904         while ((err = ERR_get_error())) {
 905                 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
 906                            ERR_error_string(err, NULL));
 907                 count++;
 908         }
 909
 910         return count;
 911 }
 912
 913 struct tls_connection * tls_connection_init(void *ssl_ctx)
 914 {
 915         SSL_CTX *ssl = ssl_ctx;
 916         struct tls_connection *conn;
 917         long options;
 918
 919         conn = os_zalloc(sizeof(*conn));
 920         if (conn == NULL)
 921                 return NULL;
 922         conn->ssl = SSL_new(ssl);
 923         if (conn->ssl == NULL) {
 924                 tls_show_errors(MSG_INFO, __func__,
 925                                 "Failed to initialize new SSL connection");
 926                 os_free(conn);
 927                 return NULL;
 928         }
 929
 930         SSL_set_app_data(conn->ssl, conn);
 931         options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
 932                 SSL_OP_SINGLE_DH_USE;
 933 #ifdef SSL_OP_NO_COMPRESSION
 934         options |= SSL_OP_NO_COMPRESSION;
 935 #endif /* SSL_OP_NO_COMPRESSION */
 936         SSL_set_options(conn->ssl, options);
 937
 938         conn->ssl_in = BIO_new(BIO_s_mem());
 939         if (!conn->ssl_in) {
 940                 tls_show_errors(MSG_INFO, __func__,
 941                                 "Failed to create a new BIO for ssl_in");
 942                 SSL_free(conn->ssl);
 943                 os_free(conn);
 944                 return NULL;
 945         }
 946
 947         conn->ssl_out = BIO_new(BIO_s_mem());
 948         if (!conn->ssl_out) {
 949                 tls_show_errors(MSG_INFO, __func__,
 950                                 "Failed to create a new BIO for ssl_out");
 951                 SSL_free(conn->ssl);
 952                 BIO_free(conn->ssl_in);
 953                 os_free(conn);
 954                 return NULL;
 955         }
 956
 957         SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
 958
 959         return conn;
 960 }
 961
 962
 963 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
 964 {
 965         if (conn == NULL)
 966                 return;
 967         SSL_free(conn->ssl);
 968         tls_engine_deinit(conn);
 969         os_free(conn->subject_match);
 970         os_free(conn->altsubject_match);
 971         os_free(conn->session_ticket);
 972         os_free(conn);
 973 }
 974
 975
 976 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
 977 {
 978         return conn ? SSL_is_init_finished(conn->ssl) : 0;
 979 }
 980
 981
 982 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
 983 {
 984         if (conn == NULL)
 985                 return -1;
 986
 987         /* Shutdown previous TLS connection without notifying the peer
 988          * because the connection was already terminated in practice
 989          * and "close notify" shutdown alert would confuse AS. */
 990         SSL_set_quiet_shutdown(conn->ssl, 1);
 991         SSL_shutdown(conn->ssl);
 992         return 0;
 993 }
 994
 995
 996 static int tls_match_altsubject_component(X509 *cert, int type,
 997                                           const char *value, size_t len)
 998 {
 999         GENERAL_NAME *gen;
1000         void *ext;
1001         int i, found = 0;
1002
1003         ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
1004
1005         for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
1006                 gen = sk_GENERAL_NAME_value(ext, i);
1007                 if (gen->type != type)
1008                         continue;
1009                 if (os_strlen((char *) gen->d.ia5->data) == len &&
1010                     os_memcmp(value, gen->d.ia5->data, len) == 0)
1011                         found++;
1012         }
1013
1014         return found;
1015 }
1016
1017
1018 static int tls_match_altsubject(X509 *cert, const char *match)
1019 {
1020         int type;
1021         const char *pos, *end;
1022         size_t len;
1023
1024         pos = match;
1025         do {
1026                 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
1027                         type = GEN_EMAIL;
1028                         pos += 6;
1029                 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
1030                         type = GEN_DNS;
1031                         pos += 4;
1032                 } else if (os_strncmp(pos, "URI:", 4) == 0) {
1033                         type = GEN_URI;
1034                         pos += 4;
1035                 } else {
1036                         wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1037                                    "match '%s'", pos);
1038                         return 0;
1039                 }
1040                 end = os_strchr(pos, ';');
1041                 while (end) {
1042                         if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1043                             os_strncmp(end + 1, "DNS:", 4) == 0 ||
1044                             os_strncmp(end + 1, "URI:", 4) == 0)
1045                                 break;
1046                         end = os_strchr(end + 1, ';');
1047                 }
1048                 if (end)
1049                         len = end - pos;
1050                 else
1051                         len = os_strlen(pos);
1052                 if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1053                         return 1;
1054                 pos = end + 1;
1055         } while (end);
1056
1057         return 0;
1058 }
1059
1060
1061 static enum tls_fail_reason openssl_tls_fail_reason(int err)
1062 {
1063         switch (err) {
1064         case X509_V_ERR_CERT_REVOKED:
1065                 return TLS_FAIL_REVOKED;
1066         case X509_V_ERR_CERT_NOT_YET_VALID:
1067         case X509_V_ERR_CRL_NOT_YET_VALID:
1068                 return TLS_FAIL_NOT_YET_VALID;
1069         case X509_V_ERR_CERT_HAS_EXPIRED:
1070         case X509_V_ERR_CRL_HAS_EXPIRED:
1071                 return TLS_FAIL_EXPIRED;
1072         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1073         case X509_V_ERR_UNABLE_TO_GET_CRL:
1074         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
1075         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
1076         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
1077         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
1078         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
1079         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
1080         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
1081         case X509_V_ERR_INVALID_CA:
1082                 return TLS_FAIL_UNTRUSTED;
1083         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
1084         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
1085         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
1086         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1087         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1088         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
1089         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
1090         case X509_V_ERR_CERT_UNTRUSTED:
1091         case X509_V_ERR_CERT_REJECTED:
1092                 return TLS_FAIL_BAD_CERTIFICATE;
1093         default:
1094                 return TLS_FAIL_UNSPECIFIED;
1095         }
1096 }
1097
1098
1099 static struct wpabuf * get_x509_cert(X509 *cert)
1100 {
1101         struct wpabuf *buf;
1102         u8 *tmp;
1103
1104         int cert_len = i2d_X509(cert, NULL);
1105         if (cert_len <= 0)
1106                 return NULL;
1107
1108         buf = wpabuf_alloc(cert_len);
1109         if (buf == NULL)
1110                 return NULL;
1111
1112         tmp = wpabuf_put(buf, cert_len);
1113         i2d_X509(cert, &tmp);
1114         return buf;
1115 }
1116
1117
1118 static void openssl_tls_fail_event(struct tls_connection *conn,
1119                                    X509 *err_cert, int err, int depth,
1120                                    const char *subject, const char *err_str,
1121                                    enum tls_fail_reason reason)
1122 {
1123         union tls_event_data ev;
1124         struct wpabuf *cert = NULL;
1125
1126         if (tls_global->event_cb == NULL)
1127                 return;
1128
1129         cert = get_x509_cert(err_cert);
1130         os_memset(&ev, 0, sizeof(ev));
1131         ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
1132                 reason : openssl_tls_fail_reason(err);
1133         ev.cert_fail.depth = depth;
1134         ev.cert_fail.subject = subject;
1135         ev.cert_fail.reason_txt = err_str;
1136         ev.cert_fail.cert = cert;
1137         tls_global->event_cb(tls_global->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
1138         wpabuf_free(cert);
1139 }
1140
1141
1142 static void openssl_tls_cert_event(struct tls_connection *conn,
1143                                    X509 *err_cert, int depth,
1144                                    const char *subject)
1145 {
1146         struct wpabuf *cert = NULL;
1147         union tls_event_data ev;
1148 #ifdef CONFIG_SHA256
1149         u8 hash[32];
1150 #endif /* CONFIG_SHA256 */
1151
1152         if (tls_global->event_cb == NULL)
1153                 return;
1154
1155         os_memset(&ev, 0, sizeof(ev));
1156         if (conn->cert_probe || tls_global->cert_in_cb) {
1157                 cert = get_x509_cert(err_cert);
1158                 ev.peer_cert.cert = cert;
1159         }
1160 #ifdef CONFIG_SHA256
1161         if (cert) {
1162                 const u8 *addr[1];
1163                 size_t len[1];
1164                 addr[0] = wpabuf_head(cert);
1165                 len[0] = wpabuf_len(cert);
1166                 if (sha256_vector(1, addr, len, hash) == 0) {
1167                         ev.peer_cert.hash = hash;
1168                         ev.peer_cert.hash_len = sizeof(hash);
1169                 }
1170         }
1171 #endif /* CONFIG_SHA256 */
1172         ev.peer_cert.depth = depth;
1173         ev.peer_cert.subject = subject;
1174         tls_global->event_cb(tls_global->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
1175         wpabuf_free(cert);
1176 }
1177
1178
1179 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
1180 {
1181         char buf[256];
1182         X509 *err_cert;
1183         int err, depth;
1184         SSL *ssl;
1185         struct tls_connection *conn;
1186         char *match, *altmatch;
1187         const char *err_str;
1188
1189         err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
1190         err = X509_STORE_CTX_get_error(x509_ctx);
1191         depth = X509_STORE_CTX_get_error_depth(x509_ctx);
1192         ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
1193                                          SSL_get_ex_data_X509_STORE_CTX_idx());
1194         X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
1195
1196         conn = SSL_get_app_data(ssl);
1197         if (conn == NULL)
1198                 return 0;
1199         match = conn->subject_match;
1200         altmatch = conn->altsubject_match;
1201
1202         if (!preverify_ok && !conn->ca_cert_verify)
1203                 preverify_ok = 1;
1204         if (!preverify_ok && depth > 0 && conn->server_cert_only)
1205                 preverify_ok = 1;
1206         if (!preverify_ok && (conn->flags & TLS_CONN_DISABLE_TIME_CHECKS) &&
1207             (err == X509_V_ERR_CERT_HAS_EXPIRED ||
1208              err == X509_V_ERR_CERT_NOT_YET_VALID)) {
1209                 wpa_printf(MSG_DEBUG, "OpenSSL: Ignore certificate validity "
1210                            "time mismatch");
1211                 preverify_ok = 1;
1212         }
1213
1214         err_str = X509_verify_cert_error_string(err);
1215
1216 #ifdef CONFIG_SHA256
1217         if (preverify_ok && depth == 0 && conn->server_cert_only) {
1218                 struct wpabuf *cert;
1219                 cert = get_x509_cert(err_cert);
1220                 if (!cert) {
1221                         wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch "
1222                                    "server certificate data");
1223                         preverify_ok = 0;
1224                 } else {
1225                         u8 hash[32];
1226                         const u8 *addr[1];
1227                         size_t len[1];
1228                         addr[0] = wpabuf_head(cert);
1229                         len[0] = wpabuf_len(cert);
1230                         if (sha256_vector(1, addr, len, hash) < 0 ||
1231                             os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
1232                                 err_str = "Server certificate mismatch";
1233                                 err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
1234                                 preverify_ok = 0;
1235                         }
1236                         wpabuf_free(cert);
1237                 }
1238         }
1239 #endif /* CONFIG_SHA256 */
1240
1241         if (!preverify_ok) {
1242                 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
1243                            " error %d (%s) depth %d for '%s'", err, err_str,
1244                            depth, buf);
1245                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1246                                        err_str, TLS_FAIL_UNSPECIFIED);
1247                 return preverify_ok;
1248         }
1249
1250         wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d "
1251                    "err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
1252                    preverify_ok, err, err_str,
1253                    conn->ca_cert_verify, depth, buf);
1254         if (depth == 0 && match && os_strstr(buf, match) == NULL) {
1255                 wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
1256                            "match with '%s'", buf, match);
1257                 preverify_ok = 0;
1258                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1259                                        "Subject mismatch",
1260                                        TLS_FAIL_SUBJECT_MISMATCH);
1261         } else if (depth == 0 && altmatch &&
1262                    !tls_match_altsubject(err_cert, altmatch)) {
1263                 wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
1264                            "'%s' not found", altmatch);
1265                 preverify_ok = 0;
1266                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1267                                        "AltSubject mismatch",
1268                                        TLS_FAIL_ALTSUBJECT_MISMATCH);
1269         } else
1270                 openssl_tls_cert_event(conn, err_cert, depth, buf);
1271
1272         if (conn->cert_probe && preverify_ok && depth == 0) {
1273                 wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate "
1274                            "on probe-only run");
1275                 preverify_ok = 0;
1276                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1277                                        "Server certificate chain probe",
1278                                        TLS_FAIL_SERVER_CHAIN_PROBE);
1279         }
1280
1281         if (preverify_ok && tls_global->event_cb != NULL)
1282                 tls_global->event_cb(tls_global->cb_ctx,
1283                                      TLS_CERT_CHAIN_SUCCESS, NULL);
1284
1285         return preverify_ok;
1286 }
1287
1288
1289 #ifndef OPENSSL_NO_STDIO
1290 static int tls_load_ca_der(void *_ssl_ctx, const char *ca_cert)
1291 {
1292         SSL_CTX *ssl_ctx = _ssl_ctx;
1293         X509_LOOKUP *lookup;
1294         int ret = 0;
1295
1296         lookup = X509_STORE_add_lookup(ssl_ctx->cert_store,
1297                                        X509_LOOKUP_file());
1298         if (lookup == NULL) {
1299                 tls_show_errors(MSG_WARNING, __func__,
1300                                 "Failed add lookup for X509 store");
1301                 return -1;
1302         }
1303
1304         if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
1305                 unsigned long err = ERR_peek_error();
1306                 tls_show_errors(MSG_WARNING, __func__,
1307                                 "Failed load CA in DER format");
1308                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1309                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1310                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1311                                    "cert already in hash table error",
1312                                    __func__);
1313                 } else
1314                         ret = -1;
1315         }
1316
1317         return ret;
1318 }
1319 #endif /* OPENSSL_NO_STDIO */
1320
1321
1322 #ifdef ANDROID
1323 static BIO * BIO_from_keystore(const char *key)
1324 {
1325         BIO *bio = NULL;
1326         char value[KEYSTORE_MESSAGE_SIZE];
1327         int length = keystore_get(key, strlen(key), value);
1328         if (length != -1 && (bio = BIO_new(BIO_s_mem())) != NULL)
1329                 BIO_write(bio, value, length);
1330         return bio;
1331 }
1332 #endif /* ANDROID */
1333
1334
1335 static int tls_connection_ca_cert(void *_ssl_ctx, struct tls_connection *conn,
1336                                   const char *ca_cert, const u8 *ca_cert_blob,
1337                                   size_t ca_cert_blob_len, const char *ca_path)
1338 {
1339         SSL_CTX *ssl_ctx = _ssl_ctx;
1340
1341         /*
1342          * Remove previously configured trusted CA certificates before adding
1343          * new ones.
1344          */
1345         X509_STORE_free(ssl_ctx->cert_store);
1346         ssl_ctx->cert_store = X509_STORE_new();
1347         if (ssl_ctx->cert_store == NULL) {
1348                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1349                            "certificate store", __func__);
1350                 return -1;
1351         }
1352
1353         SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1354         conn->ca_cert_verify = 1;
1355
1356         if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
1357                 wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate "
1358                            "chain");
1359                 conn->cert_probe = 1;
1360                 conn->ca_cert_verify = 0;
1361                 return 0;
1362         }
1363
1364         if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
1365 #ifdef CONFIG_SHA256
1366                 const char *pos = ca_cert + 7;
1367                 if (os_strncmp(pos, "server/sha256/", 14) != 0) {
1368                         wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert "
1369                                    "hash value '%s'", ca_cert);
1370                         return -1;
1371                 }
1372                 pos += 14;
1373                 if (os_strlen(pos) != 32 * 2) {
1374                         wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 "
1375                                    "hash length in ca_cert '%s'", ca_cert);
1376                         return -1;
1377                 }
1378                 if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
1379                         wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash "
1380                                    "value in ca_cert '%s'", ca_cert);
1381                         return -1;
1382                 }
1383                 conn->server_cert_only = 1;
1384                 wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server "
1385                            "certificate match");
1386                 return 0;
1387 #else /* CONFIG_SHA256 */
1388                 wpa_printf(MSG_INFO, "No SHA256 included in the build - "
1389                            "cannot validate server certificate hash");
1390                 return -1;
1391 #endif /* CONFIG_SHA256 */
1392         }
1393
1394         if (ca_cert_blob) {
1395                 X509 *cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ca_cert_blob,
1396                                       ca_cert_blob_len);
1397                 if (cert == NULL) {
1398                         tls_show_errors(MSG_WARNING, __func__,
1399                                         "Failed to parse ca_cert_blob");
1400                         return -1;
1401                 }
1402
1403                 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
1404                         unsigned long err = ERR_peek_error();
1405                         tls_show_errors(MSG_WARNING, __func__,
1406                                         "Failed to add ca_cert_blob to "
1407                                         "certificate store");
1408                         if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1409                             ERR_GET_REASON(err) ==
1410                             X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1411                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1412                                            "cert already in hash table error",
1413                                            __func__);
1414                         } else {
1415                                 X509_free(cert);
1416                                 return -1;
1417                         }
1418                 }
1419                 X509_free(cert);
1420                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
1421                            "to certificate store", __func__);
1422                 return 0;
1423         }
1424
1425 #ifdef ANDROID
1426         if (ca_cert && os_strncmp("keystore://", ca_cert, 11) == 0) {
1427                 BIO *bio = BIO_from_keystore(&ca_cert[11]);
1428                 STACK_OF(X509_INFO) *stack = NULL;
1429                 int i;
1430
1431                 if (bio) {
1432                         stack = PEM_X509_INFO_read_bio(bio, NULL, NULL, NULL);
1433                         BIO_free(bio);
1434                 }
1435                 if (!stack)
1436                         return -1;
1437
1438                 for (i = 0; i < sk_X509_INFO_num(stack); ++i) {
1439                         X509_INFO *info = sk_X509_INFO_value(stack, i);
1440                         if (info->x509) {
1441                                 X509_STORE_add_cert(ssl_ctx->cert_store,
1442                                                     info->x509);
1443                         }
1444                         if (info->crl) {
1445                                 X509_STORE_add_crl(ssl_ctx->cert_store,
1446                                                    info->crl);
1447                         }
1448                 }
1449                 sk_X509_INFO_pop_free(stack, X509_INFO_free);
1450                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1451                 return 0;
1452         }
1453 #endif /* ANDROID */
1454
1455 #ifdef CONFIG_NATIVE_WINDOWS
1456         if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
1457             0) {
1458                 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
1459                            "system certificate store");
1460                 return 0;
1461         }
1462 #endif /* CONFIG_NATIVE_WINDOWS */
1463
1464         if (ca_cert || ca_path) {
1465 #ifndef OPENSSL_NO_STDIO
1466                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
1467                     1) {
1468                         tls_show_errors(MSG_WARNING, __func__,
1469                                         "Failed to load root certificates");
1470                         if (ca_cert &&
1471                             tls_load_ca_der(ssl_ctx, ca_cert) == 0) {
1472                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
1473                                            "DER format CA certificate",
1474                                            __func__);
1475                         } else
1476                                 return -1;
1477                 } else {
1478                         wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1479                                    "certificate(s) loaded");
1480                         tls_get_errors(ssl_ctx);
1481                 }
1482 #else /* OPENSSL_NO_STDIO */
1483                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1484                            __func__);
1485                 return -1;
1486 #endif /* OPENSSL_NO_STDIO */
1487         } else {
1488                 /* No ca_cert configured - do not try to verify server
1489                  * certificate */
1490                 conn->ca_cert_verify = 0;
1491         }
1492
1493         return 0;
1494 }
1495
1496
1497 static int tls_global_ca_cert(SSL_CTX *ssl_ctx, const char *ca_cert)
1498 {
1499         if (ca_cert) {
1500                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
1501                 {
1502                         tls_show_errors(MSG_WARNING, __func__,
1503                                         "Failed to load root certificates");
1504                         return -1;
1505                 }
1506
1507                 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1508                            "certificate(s) loaded");
1509
1510 #ifndef OPENSSL_NO_STDIO
1511                 /* Add the same CAs to the client certificate requests */
1512                 SSL_CTX_set_client_CA_list(ssl_ctx,
1513                                            SSL_load_client_CA_file(ca_cert));
1514 #endif /* OPENSSL_NO_STDIO */
1515         }
1516
1517         return 0;
1518 }
1519
1520
1521 int tls_global_set_verify(void *ssl_ctx, int check_crl)
1522 {
1523         int flags;
1524
1525         if (check_crl) {
1526                 X509_STORE *cs = SSL_CTX_get_cert_store(ssl_ctx);
1527                 if (cs == NULL) {
1528                         tls_show_errors(MSG_INFO, __func__, "Failed to get "
1529                                         "certificate store when enabling "
1530                                         "check_crl");
1531                         return -1;
1532                 }
1533                 flags = X509_V_FLAG_CRL_CHECK;
1534                 if (check_crl == 2)
1535                         flags |= X509_V_FLAG_CRL_CHECK_ALL;
1536                 X509_STORE_set_flags(cs, flags);
1537         }
1538         return 0;
1539 }
1540
1541
1542 static int tls_connection_set_subject_match(struct tls_connection *conn,
1543                                             const char *subject_match,
1544                                             const char *altsubject_match)
1545 {
1546         os_free(conn->subject_match);
1547         conn->subject_match = NULL;
1548         if (subject_match) {
1549                 conn->subject_match = os_strdup(subject_match);
1550                 if (conn->subject_match == NULL)
1551                         return -1;
1552         }
1553
1554         os_free(conn->altsubject_match);
1555         conn->altsubject_match = NULL;
1556         if (altsubject_match) {
1557                 conn->altsubject_match = os_strdup(altsubject_match);
1558                 if (conn->altsubject_match == NULL)
1559                         return -1;
1560         }
1561
1562         return 0;
1563 }
1564
1565
1566 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
1567                               int verify_peer)
1568 {
1569         static int counter = 0;
1570
1571         if (conn == NULL)
1572                 return -1;
1573
1574         if (verify_peer) {
1575                 conn->ca_cert_verify = 1;
1576                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
1577                                SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
1578                                SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
1579         } else {
1580                 conn->ca_cert_verify = 0;
1581                 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
1582         }
1583
1584         SSL_set_accept_state(conn->ssl);
1585
1586         /*
1587          * Set session id context in order to avoid fatal errors when client
1588          * tries to resume a session. However, set the context to a unique
1589          * value in order to effectively disable session resumption for now
1590          * since not all areas of the server code are ready for it (e.g.,
1591          * EAP-TTLS needs special handling for Phase 2 after abbreviated TLS
1592          * handshake).
1593          */
1594         counter++;
1595         SSL_set_session_id_context(conn->ssl,
1596                                    (const unsigned char *) &counter,
1597                                    sizeof(counter));
1598
1599         return 0;
1600 }
1601
1602
1603 static int tls_connection_client_cert(struct tls_connection *conn,
1604                                       const char *client_cert,
1605                                       const u8 *client_cert_blob,
1606                                       size_t client_cert_blob_len)
1607 {
1608         if (client_cert == NULL && client_cert_blob == NULL)
1609                 return 0;
1610
1611         if (client_cert_blob &&
1612             SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
1613                                      client_cert_blob_len) == 1) {
1614                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
1615                            "OK");
1616                 return 0;
1617         } else if (client_cert_blob) {
1618                 tls_show_errors(MSG_DEBUG, __func__,
1619                                 "SSL_use_certificate_ASN1 failed");
1620         }
1621
1622         if (client_cert == NULL)
1623                 return -1;
1624
1625 #ifdef ANDROID
1626         if (os_strncmp("keystore://", client_cert, 11) == 0) {
1627                 BIO *bio = BIO_from_keystore(&client_cert[11]);
1628                 X509 *x509 = NULL;
1629                 int ret = -1;
1630                 if (bio) {
1631                         x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
1632                         BIO_free(bio);
1633                 }
1634                 if (x509) {
1635                         if (SSL_use_certificate(conn->ssl, x509) == 1)
1636                                 ret = 0;
1637                         X509_free(x509);
1638                 }
1639                 return ret;
1640         }
1641 #endif /* ANDROID */
1642
1643 #ifndef OPENSSL_NO_STDIO
1644         if (SSL_use_certificate_file(conn->ssl, client_cert,
1645                                      SSL_FILETYPE_ASN1) == 1) {
1646                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
1647                            " --> OK");
1648                 return 0;
1649         }
1650
1651         if (SSL_use_certificate_file(conn->ssl, client_cert,
1652                                      SSL_FILETYPE_PEM) == 1) {
1653                 ERR_clear_error();
1654                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
1655                            " --> OK");
1656                 return 0;
1657         }
1658
1659         tls_show_errors(MSG_DEBUG, __func__,
1660                         "SSL_use_certificate_file failed");
1661 #else /* OPENSSL_NO_STDIO */
1662         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1663 #endif /* OPENSSL_NO_STDIO */
1664
1665         return -1;
1666 }
1667
1668
1669 static int tls_global_client_cert(SSL_CTX *ssl_ctx, const char *client_cert)
1670 {
1671 #ifndef OPENSSL_NO_STDIO
1672         if (client_cert == NULL)
1673                 return 0;
1674
1675         if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1676                                          SSL_FILETYPE_ASN1) != 1 &&
1677             SSL_CTX_use_certificate_chain_file(ssl_ctx, client_cert) != 1 &&
1678             SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1679                                          SSL_FILETYPE_PEM) != 1) {
1680                 tls_show_errors(MSG_INFO, __func__,
1681                                 "Failed to load client certificate");
1682                 return -1;
1683         }
1684         return 0;
1685 #else /* OPENSSL_NO_STDIO */
1686         if (client_cert == NULL)
1687                 return 0;
1688         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1689         return -1;
1690 #endif /* OPENSSL_NO_STDIO */
1691 }
1692
1693
1694 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
1695 {
1696         if (password == NULL) {
1697                 return 0;
1698         }
1699         os_strlcpy(buf, (char *) password, size);
1700         return os_strlen(buf);
1701 }
1702
1703
1704 #ifdef PKCS12_FUNCS
1705 static int tls_parse_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, PKCS12 *p12,
1706                             const char *passwd)
1707 {
1708         EVP_PKEY *pkey;
1709         X509 *cert;
1710         STACK_OF(X509) *certs;
1711         int res = 0;
1712         char buf[256];
1713
1714         pkey = NULL;
1715         cert = NULL;
1716         certs = NULL;
1717         if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
1718                 tls_show_errors(MSG_DEBUG, __func__,
1719                                 "Failed to parse PKCS12 file");
1720                 PKCS12_free(p12);
1721                 return -1;
1722         }
1723         wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
1724
1725         if (cert) {
1726                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
1727                                   sizeof(buf));
1728                 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
1729                            "subject='%s'", buf);
1730                 if (ssl) {
1731                         if (SSL_use_certificate(ssl, cert) != 1)
1732                                 res = -1;
1733                 } else {
1734                         if (SSL_CTX_use_certificate(ssl_ctx, cert) != 1)
1735                                 res = -1;
1736                 }
1737                 X509_free(cert);
1738         }
1739
1740         if (pkey) {
1741                 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
1742                 if (ssl) {
1743                         if (SSL_use_PrivateKey(ssl, pkey) != 1)
1744                                 res = -1;
1745                 } else {
1746                         if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1)
1747                                 res = -1;
1748                 }
1749                 EVP_PKEY_free(pkey);
1750         }
1751
1752         if (certs) {
1753                 while ((cert = sk_X509_pop(certs)) != NULL) {
1754                         X509_NAME_oneline(X509_get_subject_name(cert), buf,
1755                                           sizeof(buf));
1756                         wpa_printf(MSG_DEBUG, "TLS: additional certificate"
1757                                    " from PKCS12: subject='%s'", buf);
1758                         /*
1759                          * There is no SSL equivalent for the chain cert - so
1760                          * always add it to the context...
1761                          */
1762                         if (SSL_CTX_add_extra_chain_cert(ssl_ctx, cert) != 1) {
1763                                 res = -1;
1764                                 break;
1765                         }
1766                 }
1767                 sk_X509_free(certs);
1768         }
1769
1770         PKCS12_free(p12);
1771
1772         if (res < 0)
1773                 tls_get_errors(ssl_ctx);
1774
1775         return res;
1776 }
1777 #endif  /* PKCS12_FUNCS */
1778
1779
1780 static int tls_read_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, const char *private_key,
1781                            const char *passwd)
1782 {
1783 #ifdef PKCS12_FUNCS
1784         FILE *f;
1785         PKCS12 *p12;
1786
1787         f = fopen(private_key, "rb");
1788         if (f == NULL)
1789                 return -1;
1790
1791         p12 = d2i_PKCS12_fp(f, NULL);
1792         fclose(f);
1793
1794         if (p12 == NULL) {
1795                 tls_show_errors(MSG_INFO, __func__,
1796                                 "Failed to use PKCS#12 file");
1797                 return -1;
1798         }
1799
1800         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1801
1802 #else /* PKCS12_FUNCS */
1803         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
1804                    "p12/pfx files");
1805         return -1;
1806 #endif  /* PKCS12_FUNCS */
1807 }
1808
1809
1810 static int tls_read_pkcs12_blob(SSL_CTX *ssl_ctx, SSL *ssl,
1811                                 const u8 *blob, size_t len, const char *passwd)
1812 {
1813 #ifdef PKCS12_FUNCS
1814         PKCS12 *p12;
1815
1816         p12 = d2i_PKCS12(NULL, (OPENSSL_d2i_TYPE) &blob, len);
1817         if (p12 == NULL) {
1818                 tls_show_errors(MSG_INFO, __func__,
1819                                 "Failed to use PKCS#12 blob");
1820                 return -1;
1821         }
1822
1823         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1824
1825 #else /* PKCS12_FUNCS */
1826         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
1827                    "p12/pfx blobs");
1828         return -1;
1829 #endif  /* PKCS12_FUNCS */
1830 }
1831
1832
1833 #ifndef OPENSSL_NO_ENGINE
1834 static int tls_engine_get_cert(struct tls_connection *conn,
1835                                const char *cert_id,
1836                                X509 **cert)
1837 {
1838         /* this runs after the private key is loaded so no PIN is required */
1839         struct {
1840                 const char *cert_id;
1841                 X509 *cert;
1842         } params;
1843         params.cert_id = cert_id;
1844         params.cert = NULL;
1845
1846         if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
1847                              0, &params, NULL, 1)) {
1848                 wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
1849                            " '%s' [%s]", cert_id,
1850                            ERR_error_string(ERR_get_error(), NULL));
1851                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1852         }
1853         if (!params.cert) {
1854                 wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
1855                            " '%s'", cert_id);
1856                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1857         }
1858         *cert = params.cert;
1859         return 0;
1860 }
1861 #endif /* OPENSSL_NO_ENGINE */
1862
1863
1864 static int tls_connection_engine_client_cert(struct tls_connection *conn,
1865                                              const char *cert_id)
1866 {
1867 #ifndef OPENSSL_NO_ENGINE
1868         X509 *cert;
1869
1870         if (tls_engine_get_cert(conn, cert_id, &cert))
1871                 return -1;
1872
1873         if (!SSL_use_certificate(conn->ssl, cert)) {
1874                 tls_show_errors(MSG_ERROR, __func__,
1875                                 "SSL_use_certificate failed");
1876                 X509_free(cert);
1877                 return -1;
1878         }
1879         X509_free(cert);
1880         wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
1881                    "OK");
1882         return 0;
1883
1884 #else /* OPENSSL_NO_ENGINE */
1885         return -1;
1886 #endif /* OPENSSL_NO_ENGINE */
1887 }
1888
1889
1890 static int tls_connection_engine_ca_cert(void *_ssl_ctx,
1891                                          struct tls_connection *conn,
1892                                          const char *ca_cert_id)
1893 {
1894 #ifndef OPENSSL_NO_ENGINE
1895         X509 *cert;
1896         SSL_CTX *ssl_ctx = _ssl_ctx;
1897
1898         if (tls_engine_get_cert(conn, ca_cert_id, &cert))
1899                 return -1;
1900
1901         /* start off the same as tls_connection_ca_cert */
1902         X509_STORE_free(ssl_ctx->cert_store);
1903         ssl_ctx->cert_store = X509_STORE_new();
1904         if (ssl_ctx->cert_store == NULL) {
1905                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1906                            "certificate store", __func__);
1907                 X509_free(cert);
1908                 return -1;
1909         }
1910         if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
1911                 unsigned long err = ERR_peek_error();
1912                 tls_show_errors(MSG_WARNING, __func__,
1913                                 "Failed to add CA certificate from engine "
1914                                 "to certificate store");
1915                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1916                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1917                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
1918                                    " already in hash table error",
1919                                    __func__);
1920                 } else {
1921                         X509_free(cert);
1922                         return -1;
1923                 }
1924         }
1925         X509_free(cert);
1926         wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
1927                    "to certificate store", __func__);
1928         SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1929         conn->ca_cert_verify = 1;
1930
1931         return 0;
1932
1933 #else /* OPENSSL_NO_ENGINE */
1934         return -1;
1935 #endif /* OPENSSL_NO_ENGINE */
1936 }
1937
1938
1939 static int tls_connection_engine_private_key(struct tls_connection *conn)
1940 {
1941 #ifndef OPENSSL_NO_ENGINE
1942         if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
1943                 tls_show_errors(MSG_ERROR, __func__,
1944                                 "ENGINE: cannot use private key for TLS");
1945                 return -1;
1946         }
1947         if (!SSL_check_private_key(conn->ssl)) {
1948                 tls_show_errors(MSG_INFO, __func__,
1949                                 "Private key failed verification");
1950                 return -1;
1951         }
1952         return 0;
1953 #else /* OPENSSL_NO_ENGINE */
1954         wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
1955                    "engine support was not compiled in");
1956         return -1;
1957 #endif /* OPENSSL_NO_ENGINE */
1958 }
1959
1960
1961 static int tls_connection_private_key(void *_ssl_ctx,
1962                                       struct tls_connection *conn,
1963                                       const char *private_key,
1964                                       const char *private_key_passwd,
1965                                       const u8 *private_key_blob,
1966                                       size_t private_key_blob_len)
1967 {
1968         SSL_CTX *ssl_ctx = _ssl_ctx;
1969         char *passwd;
1970         int ok;
1971
1972         if (private_key == NULL && private_key_blob == NULL)
1973                 return 0;
1974
1975         if (private_key_passwd) {
1976                 passwd = os_strdup(private_key_passwd);
1977                 if (passwd == NULL)
1978                         return -1;
1979         } else
1980                 passwd = NULL;
1981
1982         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
1983         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
1984
1985         ok = 0;
1986         while (private_key_blob) {
1987                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
1988                                             (u8 *) private_key_blob,
1989                                             private_key_blob_len) == 1) {
1990                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
1991                                    "ASN1(EVP_PKEY_RSA) --> OK");
1992                         ok = 1;
1993                         break;
1994                 }
1995
1996                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
1997                                             (u8 *) private_key_blob,
1998                                             private_key_blob_len) == 1) {
1999                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
2000                                    "ASN1(EVP_PKEY_DSA) --> OK");
2001                         ok = 1;
2002                         break;
2003                 }
2004
2005                 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
2006                                                (u8 *) private_key_blob,
2007                                                private_key_blob_len) == 1) {
2008                         wpa_printf(MSG_DEBUG, "OpenSSL: "
2009                                    "SSL_use_RSAPrivateKey_ASN1 --> OK");
2010                         ok = 1;
2011                         break;
2012                 }
2013
2014                 if (tls_read_pkcs12_blob(ssl_ctx, conn->ssl, private_key_blob,
2015                                          private_key_blob_len, passwd) == 0) {
2016                         wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
2017                                    "OK");
2018                         ok = 1;
2019                         break;
2020                 }
2021
2022                 break;
2023         }
2024
2025 #ifdef ANDROID
2026         if (!ok && private_key &&
2027             os_strncmp("keystore://", private_key, 11) == 0) {
2028                 BIO *bio = BIO_from_keystore(&private_key[11]);
2029                 EVP_PKEY *pkey = NULL;
2030                 if (bio) {
2031                         pkey = PEM_read_bio_PrivateKey(bio, NULL, NULL, NULL);
2032                         BIO_free(bio);
2033                 }
2034                 if (pkey) {
2035                         if (SSL_use_PrivateKey(conn->ssl, pkey) == 1) {
2036                                 wpa_printf(MSG_DEBUG, "OpenSSL: Private key "
2037                                            "from keystore");
2038                                 ok = 1;
2039                         }
2040                         EVP_PKEY_free(pkey);
2041                 }
2042         }
2043 #endif /* ANDROID */
2044
2045         while (!ok && private_key) {
2046 #ifndef OPENSSL_NO_STDIO
2047                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
2048                                             SSL_FILETYPE_ASN1) == 1) {
2049                         wpa_printf(MSG_DEBUG, "OpenSSL: "
2050                                    "SSL_use_PrivateKey_File (DER) --> OK");
2051                         ok = 1;
2052                         break;
2053                 }
2054
2055                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
2056                                             SSL_FILETYPE_PEM) == 1) {
2057                         wpa_printf(MSG_DEBUG, "OpenSSL: "
2058                                    "SSL_use_PrivateKey_File (PEM) --> OK");
2059                         ok = 1;
2060                         break;
2061                 }
2062 #else /* OPENSSL_NO_STDIO */
2063                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
2064                            __func__);
2065 #endif /* OPENSSL_NO_STDIO */
2066
2067                 if (tls_read_pkcs12(ssl_ctx, conn->ssl, private_key, passwd)
2068                     == 0) {
2069                         wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
2070                                    "--> OK");
2071                         ok = 1;
2072                         break;
2073                 }
2074
2075                 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
2076                         wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
2077                                    "access certificate store --> OK");
2078                         ok = 1;
2079                         break;
2080                 }
2081
2082                 break;
2083         }
2084
2085         if (!ok) {
2086                 tls_show_errors(MSG_INFO, __func__,
2087                                 "Failed to load private key");
2088                 os_free(passwd);
2089                 return -1;
2090         }
2091         ERR_clear_error();
2092         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2093         os_free(passwd);
2094
2095         if (!SSL_check_private_key(conn->ssl)) {
2096                 tls_show_errors(MSG_INFO, __func__, "Private key failed "
2097                                 "verification");
2098                 return -1;
2099         }
2100
2101         wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
2102         return 0;
2103 }
2104
2105
2106 static int tls_global_private_key(SSL_CTX *ssl_ctx, const char *private_key,
2107                                   const char *private_key_passwd)
2108 {
2109         char *passwd;
2110
2111         if (private_key == NULL)
2112                 return 0;
2113
2114         if (private_key_passwd) {
2115                 passwd = os_strdup(private_key_passwd);
2116                 if (passwd == NULL)
2117                         return -1;
2118         } else
2119                 passwd = NULL;
2120
2121         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
2122         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
2123         if (
2124 #ifndef OPENSSL_NO_STDIO
2125             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2126                                         SSL_FILETYPE_ASN1) != 1 &&
2127             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2128                                         SSL_FILETYPE_PEM) != 1 &&
2129 #endif /* OPENSSL_NO_STDIO */
2130             tls_read_pkcs12(ssl_ctx, NULL, private_key, passwd)) {
2131                 tls_show_errors(MSG_INFO, __func__,
2132                                 "Failed to load private key");
2133                 os_free(passwd);
2134                 ERR_clear_error();
2135                 return -1;
2136         }
2137         os_free(passwd);
2138         ERR_clear_error();
2139         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2140
2141         if (!SSL_CTX_check_private_key(ssl_ctx)) {
2142                 tls_show_errors(MSG_INFO, __func__,
2143                                 "Private key failed verification");
2144                 return -1;
2145         }
2146
2147         return 0;
2148 }
2149
2150
2151 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
2152 {
2153 #ifdef OPENSSL_NO_DH
2154         if (dh_file == NULL)
2155                 return 0;
2156         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2157                    "dh_file specified");
2158         return -1;
2159 #else /* OPENSSL_NO_DH */
2160         DH *dh;
2161         BIO *bio;
2162
2163         /* TODO: add support for dh_blob */
2164         if (dh_file == NULL)
2165                 return 0;
2166         if (conn == NULL)
2167                 return -1;
2168
2169         bio = BIO_new_file(dh_file, "r");
2170         if (bio == NULL) {
2171                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
2172                            dh_file, ERR_error_string(ERR_get_error(), NULL));
2173                 return -1;
2174         }
2175         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
2176         BIO_free(bio);
2177 #ifndef OPENSSL_NO_DSA
2178         while (dh == NULL) {
2179                 DSA *dsa;
2180                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
2181                            " trying to parse as DSA params", dh_file,
2182                            ERR_error_string(ERR_get_error(), NULL));
2183                 bio = BIO_new_file(dh_file, "r");
2184                 if (bio == NULL)
2185                         break;
2186                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
2187                 BIO_free(bio);
2188                 if (!dsa) {
2189                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
2190                                    "'%s': %s", dh_file,
2191                                    ERR_error_string(ERR_get_error(), NULL));
2192                         break;
2193                 }
2194
2195                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2196                 dh = DSA_dup_DH(dsa);
2197                 DSA_free(dsa);
2198                 if (dh == NULL) {
2199                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2200                                    "params into DH params");
2201                         break;
2202                 }
2203                 break;
2204         }
2205 #endif /* !OPENSSL_NO_DSA */
2206         if (dh == NULL) {
2207                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2208                            "'%s'", dh_file);
2209                 return -1;
2210         }
2211
2212         if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
2213                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2214                            "%s", dh_file,
2215                            ERR_error_string(ERR_get_error(), NULL));
2216                 DH_free(dh);
2217                 return -1;
2218         }
2219         DH_free(dh);
2220         return 0;
2221 #endif /* OPENSSL_NO_DH */
2222 }
2223
2224
2225 static int tls_global_dh(SSL_CTX *ssl_ctx, const char *dh_file)
2226 {
2227 #ifdef OPENSSL_NO_DH
2228         if (dh_file == NULL)
2229                 return 0;
2230         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2231                    "dh_file specified");
2232         return -1;
2233 #else /* OPENSSL_NO_DH */
2234         DH *dh;
2235         BIO *bio;
2236
2237         /* TODO: add support for dh_blob */
2238         if (dh_file == NULL)
2239                 return 0;
2240         if (ssl_ctx == NULL)
2241                 return -1;
2242
2243         bio = BIO_new_file(dh_file, "r");
2244         if (bio == NULL) {
2245                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
2246                            dh_file, ERR_error_string(ERR_get_error(), NULL));
2247                 return -1;
2248         }
2249         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
2250         BIO_free(bio);
2251 #ifndef OPENSSL_NO_DSA
2252         while (dh == NULL) {
2253                 DSA *dsa;
2254                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
2255                            " trying to parse as DSA params", dh_file,
2256                            ERR_error_string(ERR_get_error(), NULL));
2257                 bio = BIO_new_file(dh_file, "r");
2258                 if (bio == NULL)
2259                         break;
2260                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
2261                 BIO_free(bio);
2262                 if (!dsa) {
2263                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
2264                                    "'%s': %s", dh_file,
2265                                    ERR_error_string(ERR_get_error(), NULL));
2266                         break;
2267                 }
2268
2269                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2270                 dh = DSA_dup_DH(dsa);
2271                 DSA_free(dsa);
2272                 if (dh == NULL) {
2273                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2274                                    "params into DH params");
2275                         break;
2276                 }
2277                 break;
2278         }
2279 #endif /* !OPENSSL_NO_DSA */
2280         if (dh == NULL) {
2281                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2282                            "'%s'", dh_file);
2283                 return -1;
2284         }
2285
2286         if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
2287                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2288                            "%s", dh_file,
2289                            ERR_error_string(ERR_get_error(), NULL));
2290                 DH_free(dh);
2291                 return -1;
2292         }
2293         DH_free(dh);
2294         return 0;
2295 #endif /* OPENSSL_NO_DH */
2296 }
2297
2298
2299 int tls_connection_get_keys(void *ssl_ctx, struct tls_connection *conn,
2300                             struct tls_keys *keys)
2301 {
2302 #ifdef CONFIG_FIPS
2303         wpa_printf(MSG_ERROR, "OpenSSL: TLS keys cannot be exported in FIPS "
2304                    "mode");
2305         return -1;
2306 #else /* CONFIG_FIPS */
2307         SSL *ssl;
2308
2309         if (conn == NULL || keys == NULL)
2310                 return -1;
2311         ssl = conn->ssl;
2312         if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL)
2313                 return -1;
2314
2315         os_memset(keys, 0, sizeof(*keys));
2316         keys->master_key = ssl->session->master_key;
2317         keys->master_key_len = ssl->session->master_key_length;
2318         keys->client_random = ssl->s3->client_random;
2319         keys->client_random_len = SSL3_RANDOM_SIZE;
2320         keys->server_random = ssl->s3->server_random;
2321         keys->server_random_len = SSL3_RANDOM_SIZE;
2322
2323         return 0;
2324 #endif /* CONFIG_FIPS */
2325 }
2326
2327
2328 int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
2329                        const char *label, int server_random_first,
2330                        u8 *out, size_t out_len)
2331 {
2332 #if OPENSSL_VERSION_NUMBER >= 0x10001000L
2333         SSL *ssl;
2334         if (conn == NULL)
2335                 return -1;
2336         if (server_random_first)
2337                 return -1;
2338         ssl = conn->ssl;
2339         if (SSL_export_keying_material(ssl, out, out_len, label,
2340                                        os_strlen(label), NULL, 0, 0) == 1) {
2341                 wpa_printf(MSG_DEBUG, "OpenSSL: Using internal PRF");
2342                 return 0;
2343         }
2344 #endif
2345         return -1;
2346 }
2347
2348
2349 static struct wpabuf *
2350 openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data,
2351                   int server)
2352 {
2353         int res;
2354         struct wpabuf *out_data;
2355
2356         /*
2357          * Give TLS handshake data from the server (if available) to OpenSSL
2358          * for processing.
2359          */
2360         if (in_data &&
2361             BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
2362             < 0) {
2363                 tls_show_errors(MSG_INFO, __func__,
2364                                 "Handshake failed - BIO_write");
2365                 return NULL;
2366         }
2367
2368         /* Initiate TLS handshake or continue the existing handshake */
2369         if (server)
2370                 res = SSL_accept(conn->ssl);
2371         else
2372                 res = SSL_connect(conn->ssl);
2373         if (res != 1) {
2374                 int err = SSL_get_error(conn->ssl, res);
2375                 if (err == SSL_ERROR_WANT_READ)
2376                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
2377                                    "more data");
2378                 else if (err == SSL_ERROR_WANT_WRITE)
2379                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
2380                                    "write");
2381                 else {
2382                         tls_show_errors(MSG_INFO, __func__, "SSL_connect");
2383                         conn->failed++;
2384                 }
2385         }
2386
2387         /* Get the TLS handshake data to be sent to the server */
2388         res = BIO_ctrl_pending(conn->ssl_out);
2389         wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
2390         out_data = wpabuf_alloc(res);
2391         if (out_data == NULL) {
2392                 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
2393                            "handshake output (%d bytes)", res);
2394                 if (BIO_reset(conn->ssl_out) < 0) {
2395                         tls_show_errors(MSG_INFO, __func__,
2396                                         "BIO_reset failed");
2397                 }
2398                 return NULL;
2399         }
2400         res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data),
2401                                       res);
2402         if (res < 0) {
2403                 tls_show_errors(MSG_INFO, __func__,
2404                                 "Handshake failed - BIO_read");
2405                 if (BIO_reset(conn->ssl_out) < 0) {
2406                         tls_show_errors(MSG_INFO, __func__,
2407                                         "BIO_reset failed");
2408                 }
2409                 wpabuf_free(out_data);
2410                 return NULL;
2411         }
2412         wpabuf_put(out_data, res);
2413
2414         return out_data;
2415 }
2416
2417
2418 static struct wpabuf *
2419 openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
2420 {
2421         struct wpabuf *appl_data;
2422         int res;
2423
2424         appl_data = wpabuf_alloc(max_len + 100);
2425         if (appl_data == NULL)
2426                 return NULL;
2427
2428         res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
2429                        wpabuf_size(appl_data));
2430         if (res < 0) {
2431                 int err = SSL_get_error(conn->ssl, res);
2432                 if (err == SSL_ERROR_WANT_READ ||
2433                     err == SSL_ERROR_WANT_WRITE) {
2434                         wpa_printf(MSG_DEBUG, "SSL: No Application Data "
2435                                    "included");
2436                 } else {
2437                         tls_show_errors(MSG_INFO, __func__,
2438                                         "Failed to read possible "
2439                                         "Application Data");
2440                 }
2441                 wpabuf_free(appl_data);
2442                 return NULL;
2443         }
2444
2445         wpabuf_put(appl_data, res);
2446         wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
2447                             "message", appl_data);
2448
2449         return appl_data;
2450 }
2451
2452
2453 static struct wpabuf *
2454 openssl_connection_handshake(struct tls_connection *conn,
2455                              const struct wpabuf *in_data,
2456                              struct wpabuf **appl_data, int server)
2457 {
2458         struct wpabuf *out_data;
2459
2460         if (appl_data)
2461                 *appl_data = NULL;
2462
2463         out_data = openssl_handshake(conn, in_data, server);
2464         if (out_data == NULL)
2465                 return NULL;
2466
2467         if (SSL_is_init_finished(conn->ssl) && appl_data && in_data)
2468                 *appl_data = openssl_get_appl_data(conn, wpabuf_len(in_data));
2469
2470         return out_data;
2471 }
2472
2473
2474 struct wpabuf *
2475 tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
2476                          const struct wpabuf *in_data,
2477                          struct wpabuf **appl_data)
2478 {
2479         return openssl_connection_handshake(conn, in_data, appl_data, 0);
2480 }
2481
2482
2483 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
2484                                                 struct tls_connection *conn,
2485                                                 const struct wpabuf *in_data,
2486                                                 struct wpabuf **appl_data)
2487 {
2488         return openssl_connection_handshake(conn, in_data, appl_data, 1);
2489 }
2490
2491
2492 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
2493                                        struct tls_connection *conn,
2494                                        const struct wpabuf *in_data)
2495 {
2496         int res;
2497         struct wpabuf *buf;
2498
2499         if (conn == NULL)
2500                 return NULL;
2501
2502         /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
2503         if ((res = BIO_reset(conn->ssl_in)) < 0 ||
2504             (res = BIO_reset(conn->ssl_out)) < 0) {
2505                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2506                 return NULL;
2507         }
2508         res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
2509         if (res < 0) {
2510                 tls_show_errors(MSG_INFO, __func__,
2511                                 "Encryption failed - SSL_write");
2512                 return NULL;
2513         }
2514
2515         /* Read encrypted data to be sent to the server */
2516         buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
2517         if (buf == NULL)
2518                 return NULL;
2519         res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
2520         if (res < 0) {
2521                 tls_show_errors(MSG_INFO, __func__,
2522                                 "Encryption failed - BIO_read");
2523                 wpabuf_free(buf);
2524                 return NULL;
2525         }
2526         wpabuf_put(buf, res);
2527
2528         return buf;
2529 }
2530
2531
2532 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
2533                                        struct tls_connection *conn,
2534                                        const struct wpabuf *in_data)
2535 {
2536         int res;
2537         struct wpabuf *buf;
2538
2539         /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
2540         res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
2541                         wpabuf_len(in_data));
2542         if (res < 0) {
2543                 tls_show_errors(MSG_INFO, __func__,
2544                                 "Decryption failed - BIO_write");
2545                 return NULL;
2546         }
2547         if (BIO_reset(conn->ssl_out) < 0) {
2548                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2549                 return NULL;
2550         }
2551
2552         /* Read decrypted data for further processing */
2553         /*
2554          * Even though we try to disable TLS compression, it is possible that
2555          * this cannot be done with all TLS libraries. Add extra buffer space
2556          * to handle the possibility of the decrypted data being longer than
2557          * input data.
2558          */
2559         buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
2560         if (buf == NULL)
2561                 return NULL;
2562         res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
2563         if (res < 0) {
2564                 tls_show_errors(MSG_INFO, __func__,
2565                                 "Decryption failed - SSL_read");
2566                 wpabuf_free(buf);
2567                 return NULL;
2568         }
2569         wpabuf_put(buf, res);
2570
2571         return buf;
2572 }
2573
2574
2575 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
2576 {
2577         return conn ? conn->ssl->hit : 0;
2578 }
2579
2580
2581 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
2582                                    u8 *ciphers)
2583 {
2584         char buf[100], *pos, *end;
2585         u8 *c;
2586         int ret;
2587
2588         if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
2589                 return -1;
2590
2591         buf[0] = '\0';
2592         pos = buf;
2593         end = pos + sizeof(buf);
2594
2595         c = ciphers;
2596         while (*c != TLS_CIPHER_NONE) {
2597                 const char *suite;
2598
2599                 switch (*c) {
2600                 case TLS_CIPHER_RC4_SHA:
2601                         suite = "RC4-SHA";
2602                         break;
2603                 case TLS_CIPHER_AES128_SHA:
2604                         suite = "AES128-SHA";
2605                         break;
2606                 case TLS_CIPHER_RSA_DHE_AES128_SHA:
2607                         suite = "DHE-RSA-AES128-SHA";
2608                         break;
2609                 case TLS_CIPHER_ANON_DH_AES128_SHA:
2610                         suite = "ADH-AES128-SHA";
2611                         break;
2612                 default:
2613                         wpa_printf(MSG_DEBUG, "TLS: Unsupported "
2614                                    "cipher selection: %d", *c);
2615                         return -1;
2616                 }
2617                 ret = os_snprintf(pos, end - pos, ":%s", suite);
2618                 if (ret < 0 || ret >= end - pos)
2619                         break;
2620                 pos += ret;
2621
2622                 c++;
2623         }
2624
2625         wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
2626
2627         if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
2628                 tls_show_errors(MSG_INFO, __func__,
2629                                 "Cipher suite configuration failed");
2630                 return -1;
2631         }
2632
2633         return 0;
2634 }
2635
2636
2637 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
2638                    char *buf, size_t buflen)
2639 {
2640         const char *name;
2641         if (conn == NULL || conn->ssl == NULL)
2642                 return -1;
2643
2644         name = SSL_get_cipher(conn->ssl);
2645         if (name == NULL)
2646                 return -1;
2647
2648         os_strlcpy(buf, name, buflen);
2649         return 0;
2650 }
2651
2652
2653 int tls_connection_enable_workaround(void *ssl_ctx,
2654                                      struct tls_connection *conn)
2655 {
2656         SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
2657
2658         return 0;
2659 }
2660
2661
2662 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2663 /* ClientHello TLS extensions require a patch to openssl, so this function is
2664  * commented out unless explicitly needed for EAP-FAST in order to be able to
2665  * build this file with unmodified openssl. */
2666 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
2667                                     int ext_type, const u8 *data,
2668                                     size_t data_len)
2669 {
2670         if (conn == NULL || conn->ssl == NULL || ext_type != 35)
2671                 return -1;
2672
2673 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2674         if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
2675                                        data_len) != 1)
2676                 return -1;
2677 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2678         if (SSL_set_hello_extension(conn->ssl, ext_type, (void *) data,
2679                                     data_len) != 1)
2680                 return -1;
2681 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2682
2683         return 0;
2684 }
2685 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2686
2687
2688 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
2689 {
2690         if (conn == NULL)
2691                 return -1;
2692         return conn->failed;
2693 }
2694
2695
2696 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
2697 {
2698         if (conn == NULL)
2699                 return -1;
2700         return conn->read_alerts;
2701 }
2702
2703
2704 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
2705 {
2706         if (conn == NULL)
2707                 return -1;
2708         return conn->write_alerts;
2709 }
2710
2711
2712 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
2713                               const struct tls_connection_params *params)
2714 {
2715         int ret;
2716         unsigned long err;
2717
2718         if (conn == NULL)
2719                 return -1;
2720
2721         while ((err = ERR_get_error())) {
2722                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2723                            __func__, ERR_error_string(err, NULL));
2724         }
2725
2726         if (params->engine) {
2727                 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
2728                 ret = tls_engine_init(conn, params->engine_id, params->pin,
2729                                       params->key_id, params->cert_id,
2730                                       params->ca_cert_id);
2731                 if (ret)
2732                         return ret;
2733         }
2734         if (tls_connection_set_subject_match(conn,
2735                                              params->subject_match,
2736                                              params->altsubject_match))
2737                 return -1;
2738
2739         if (params->engine && params->ca_cert_id) {
2740                 if (tls_connection_engine_ca_cert(tls_ctx, conn,
2741                                                   params->ca_cert_id))
2742                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2743         } else if (tls_connection_ca_cert(tls_ctx, conn, params->ca_cert,
2744                                           params->ca_cert_blob,
2745                                           params->ca_cert_blob_len,
2746                                           params->ca_path))
2747                 return -1;
2748
2749         if (params->engine && params->cert_id) {
2750                 if (tls_connection_engine_client_cert(conn, params->cert_id))
2751                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2752         } else if (tls_connection_client_cert(conn, params->client_cert,
2753                                               params->client_cert_blob,
2754                                               params->client_cert_blob_len))
2755                 return -1;
2756
2757         if (params->engine && params->key_id) {
2758                 wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
2759                 if (tls_connection_engine_private_key(conn))
2760                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2761         } else if (tls_connection_private_key(tls_ctx, conn,
2762                                               params->private_key,
2763                                               params->private_key_passwd,
2764                                               params->private_key_blob,
2765                                               params->private_key_blob_len)) {
2766                 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
2767                            params->private_key);
2768                 return -1;
2769         }
2770
2771         if (tls_connection_dh(conn, params->dh_file)) {
2772                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2773                            params->dh_file);
2774                 return -1;
2775         }
2776
2777 #ifdef SSL_OP_NO_TICKET
2778         if (params->flags & TLS_CONN_DISABLE_SESSION_TICKET)
2779                 SSL_set_options(conn->ssl, SSL_OP_NO_TICKET);
2780         else
2781                 SSL_clear_options(conn->ssl, SSL_OP_NO_TICKET);
2782 #endif /*  SSL_OP_NO_TICKET */
2783
2784         conn->flags = params->flags;
2785
2786         tls_get_errors(tls_ctx);
2787
2788         return 0;
2789 }
2790
2791
2792 int tls_global_set_params(void *tls_ctx,
2793                           const struct tls_connection_params *params)
2794 {
2795         SSL_CTX *ssl_ctx = tls_ctx;
2796         unsigned long err;
2797
2798         while ((err = ERR_get_error())) {
2799                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2800                            __func__, ERR_error_string(err, NULL));
2801         }
2802
2803         if (tls_global_ca_cert(ssl_ctx, params->ca_cert))
2804                 return -1;
2805
2806         if (tls_global_client_cert(ssl_ctx, params->client_cert))
2807                 return -1;
2808
2809         if (tls_global_private_key(ssl_ctx, params->private_key,
2810                                    params->private_key_passwd))
2811                 return -1;
2812
2813         if (tls_global_dh(ssl_ctx, params->dh_file)) {
2814                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2815                            params->dh_file);
2816                 return -1;
2817         }
2818
2819 #ifdef SSL_OP_NO_TICKET
2820         if (params->flags & TLS_CONN_DISABLE_SESSION_TICKET)
2821                 SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_TICKET);
2822         else
2823                 SSL_CTX_clear_options(ssl_ctx, SSL_OP_NO_TICKET);
2824 #endif /*  SSL_OP_NO_TICKET */
2825
2826         return 0;
2827 }
2828
2829
2830 int tls_connection_get_keyblock_size(void *tls_ctx,
2831                                      struct tls_connection *conn)
2832 {
2833         const EVP_CIPHER *c;
2834         const EVP_MD *h;
2835         int md_size;
2836
2837         if (conn == NULL || conn->ssl == NULL ||
2838             conn->ssl->enc_read_ctx == NULL ||
2839             conn->ssl->enc_read_ctx->cipher == NULL ||
2840             conn->ssl->read_hash == NULL)
2841                 return -1;
2842
2843         c = conn->ssl->enc_read_ctx->cipher;
2844 #if OPENSSL_VERSION_NUMBER >= 0x00909000L
2845         h = EVP_MD_CTX_md(conn->ssl->read_hash);
2846 #else
2847         h = conn->ssl->read_hash;
2848 #endif
2849         if (h)
2850                 md_size = EVP_MD_size(h);
2851 #if OPENSSL_VERSION_NUMBER >= 0x10000000L
2852         else if (conn->ssl->s3)
2853                 md_size = conn->ssl->s3->tmp.new_mac_secret_size;
2854 #endif
2855         else
2856                 return -1;
2857
2858         wpa_printf(MSG_DEBUG, "OpenSSL: keyblock size: key_len=%d MD_size=%d "
2859                    "IV_len=%d", EVP_CIPHER_key_length(c), md_size,
2860                    EVP_CIPHER_iv_length(c));
2861         return 2 * (EVP_CIPHER_key_length(c) +
2862                     md_size +
2863                     EVP_CIPHER_iv_length(c));
2864 }
2865
2866
2867 unsigned int tls_capabilities(void *tls_ctx)
2868 {
2869         return 0;
2870 }
2871
2872
2873 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2874 /* Pre-shared secred requires a patch to openssl, so this function is
2875  * commented out unless explicitly needed for EAP-FAST in order to be able to
2876  * build this file with unmodified openssl. */
2877
2878 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
2879                            STACK_OF(SSL_CIPHER) *peer_ciphers,
2880                            SSL_CIPHER **cipher, void *arg)
2881 {
2882         struct tls_connection *conn = arg;
2883         int ret;
2884
2885         if (conn == NULL || conn->session_ticket_cb == NULL)
2886                 return 0;
2887
2888         ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
2889                                       conn->session_ticket,
2890                                       conn->session_ticket_len,
2891                                       s->s3->client_random,
2892                                       s->s3->server_random, secret);
2893         os_free(conn->session_ticket);
2894         conn->session_ticket = NULL;
2895
2896         if (ret <= 0)
2897                 return 0;
2898
2899         *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
2900         return 1;
2901 }
2902
2903
2904 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2905 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
2906                                      int len, void *arg)
2907 {
2908         struct tls_connection *conn = arg;
2909
2910         if (conn == NULL || conn->session_ticket_cb == NULL)
2911                 return 0;
2912
2913         wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
2914
2915         os_free(conn->session_ticket);
2916         conn->session_ticket = NULL;
2917
2918         wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2919                     "extension", data, len);
2920
2921         conn->session_ticket = os_malloc(len);
2922         if (conn->session_ticket == NULL)
2923                 return 0;
2924
2925         os_memcpy(conn->session_ticket, data, len);
2926         conn->session_ticket_len = len;
2927
2928         return 1;
2929 }
2930 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2931 #ifdef SSL_OP_NO_TICKET
2932 static void tls_hello_ext_cb(SSL *s, int client_server, int type,
2933                              unsigned char *data, int len, void *arg)
2934 {
2935         struct tls_connection *conn = arg;
2936
2937         if (conn == NULL || conn->session_ticket_cb == NULL)
2938                 return;
2939
2940         wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2941                    type, len);
2942
2943         if (type == TLSEXT_TYPE_session_ticket && !client_server) {
2944                 os_free(conn->session_ticket);
2945                 conn->session_ticket = NULL;
2946
2947                 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2948                             "extension", data, len);
2949                 conn->session_ticket = os_malloc(len);
2950                 if (conn->session_ticket == NULL)
2951                         return;
2952
2953                 os_memcpy(conn->session_ticket, data, len);
2954                 conn->session_ticket_len = len;
2955         }
2956 }
2957 #else /* SSL_OP_NO_TICKET */
2958 static int tls_hello_ext_cb(SSL *s, TLS_EXTENSION *ext, void *arg)
2959 {
2960         struct tls_connection *conn = arg;
2961
2962         if (conn == NULL || conn->session_ticket_cb == NULL)
2963                 return 0;
2964
2965         wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2966                    ext->type, ext->length);
2967
2968         os_free(conn->session_ticket);
2969         conn->session_ticket = NULL;
2970
2971         if (ext->type == 35) {
2972                 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2973                             "extension", ext->data, ext->length);
2974                 conn->session_ticket = os_malloc(ext->length);
2975                 if (conn->session_ticket == NULL)
2976                         return SSL_AD_INTERNAL_ERROR;
2977
2978                 os_memcpy(conn->session_ticket, ext->data, ext->length);
2979                 conn->session_ticket_len = ext->length;
2980         }
2981
2982         return 0;
2983 }
2984 #endif /* SSL_OP_NO_TICKET */
2985 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2986 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2987
2988
2989 int tls_connection_set_session_ticket_cb(void *tls_ctx,
2990                                          struct tls_connection *conn,
2991                                          tls_session_ticket_cb cb,
2992                                          void *ctx)
2993 {
2994 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2995         conn->session_ticket_cb = cb;
2996         conn->session_ticket_cb_ctx = ctx;
2997
2998         if (cb) {
2999                 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
3000                                               conn) != 1)
3001                         return -1;
3002 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
3003                 SSL_set_session_ticket_ext_cb(conn->ssl,
3004                                               tls_session_ticket_ext_cb, conn);
3005 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
3006 #ifdef SSL_OP_NO_TICKET
3007                 SSL_set_tlsext_debug_callback(conn->ssl, tls_hello_ext_cb);
3008                 SSL_set_tlsext_debug_arg(conn->ssl, conn);
3009 #else /* SSL_OP_NO_TICKET */
3010                 if (SSL_set_hello_extension_cb(conn->ssl, tls_hello_ext_cb,
3011                                                conn) != 1)
3012                         return -1;
3013 #endif /* SSL_OP_NO_TICKET */
3014 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
3015         } else {
3016                 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
3017                         return -1;
3018 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
3019                 SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
3020 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
3021 #ifdef SSL_OP_NO_TICKET
3022                 SSL_set_tlsext_debug_callback(conn->ssl, NULL);
3023                 SSL_set_tlsext_debug_arg(conn->ssl, conn);
3024 #else /* SSL_OP_NO_TICKET */
3025                 if (SSL_set_hello_extension_cb(conn->ssl, NULL, NULL) != 1)
3026                         return -1;
3027 #endif /* SSL_OP_NO_TICKET */
3028 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
3029         }
3030
3031         return 0;
3032 #else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3033         return -1;
3034 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
3035 }