www.project-moonshot.org Git - mech_eap.orig/blob - libeap/src/crypto/tls_openssl.c

   1 /*
   2  * SSL/TLS interface functions for OpenSSL
   3  * Copyright (c) 2004-2010, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #ifndef CONFIG_SMARTCARD
  18 #ifndef OPENSSL_NO_ENGINE
  19 #define OPENSSL_NO_ENGINE
  20 #endif
  21 #endif
  22
  23 #include <openssl/ssl.h>
  24 #include <openssl/err.h>
  25 #include <openssl/pkcs12.h>
  26 #include <openssl/x509v3.h>
  27 #ifndef OPENSSL_NO_ENGINE
  28 #include <openssl/engine.h>
  29 #endif /* OPENSSL_NO_ENGINE */
  30
  31 #include "common.h"
  32 #include "crypto.h"
  33 #include "tls.h"
  34
  35 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
  36 #define OPENSSL_d2i_TYPE const unsigned char **
  37 #else
  38 #define OPENSSL_d2i_TYPE unsigned char **
  39 #endif
  40
  41 #ifdef SSL_F_SSL_SET_SESSION_TICKET_EXT
  42 #ifdef SSL_OP_NO_TICKET
  43 /*
  44  * Session ticket override patch was merged into OpenSSL 0.9.9 tree on
  45  * 2008-11-15. This version uses a bit different API compared to the old patch.
  46  */
  47 #define CONFIG_OPENSSL_TICKET_OVERRIDE
  48 #endif
  49 #endif
  50
  51 static int tls_openssl_ref_count = 0;
  52
  53 struct tls_global {
  54         void (*event_cb)(void *ctx, enum tls_event ev,
  55                          union tls_event_data *data);
  56         void *cb_ctx;
  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
  86
  87 #ifdef CONFIG_NO_STDOUT_DEBUG
  88
  89 static void _tls_show_errors(void)
  90 {
  91         unsigned long err;
  92
  93         while ((err = ERR_get_error())) {
  94                 /* Just ignore the errors, since stdout is disabled */
  95         }
  96 }
  97 #define tls_show_errors(l, f, t) _tls_show_errors()
  98
  99 #else /* CONFIG_NO_STDOUT_DEBUG */
 100
 101 static void tls_show_errors(int level, const char *func, const char *txt)
 102 {
 103         unsigned long err;
 104
 105         wpa_printf(level, "OpenSSL: %s - %s %s",
 106                    func, txt, ERR_error_string(ERR_get_error(), NULL));
 107
 108         while ((err = ERR_get_error())) {
 109                 wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
 110                            ERR_error_string(err, NULL));
 111         }
 112 }
 113
 114 #endif /* CONFIG_NO_STDOUT_DEBUG */
 115
 116
 117 #ifdef CONFIG_NATIVE_WINDOWS
 118
 119 /* Windows CryptoAPI and access to certificate stores */
 120 #include <wincrypt.h>
 121
 122 #ifdef __MINGW32_VERSION
 123 /*
 124  * MinGW does not yet include all the needed definitions for CryptoAPI, so
 125  * define here whatever extra is needed.
 126  */
 127 #define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
 128 #define CERT_STORE_READONLY_FLAG 0x00008000
 129 #define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000
 130
 131 #endif /* __MINGW32_VERSION */
 132
 133
 134 struct cryptoapi_rsa_data {
 135         const CERT_CONTEXT *cert;
 136         HCRYPTPROV crypt_prov;
 137         DWORD key_spec;
 138         BOOL free_crypt_prov;
 139 };
 140
 141
 142 static void cryptoapi_error(const char *msg)
 143 {
 144         wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
 145                    msg, (unsigned int) GetLastError());
 146 }
 147
 148
 149 static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
 150                                  unsigned char *to, RSA *rsa, int padding)
 151 {
 152         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 153         return 0;
 154 }
 155
 156
 157 static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
 158                                  unsigned char *to, RSA *rsa, int padding)
 159 {
 160         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 161         return 0;
 162 }
 163
 164
 165 static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
 166                                   unsigned char *to, RSA *rsa, int padding)
 167 {
 168         struct cryptoapi_rsa_data *priv =
 169                 (struct cryptoapi_rsa_data *) rsa->meth->app_data;
 170         HCRYPTHASH hash;
 171         DWORD hash_size, len, i;
 172         unsigned char *buf = NULL;
 173         int ret = 0;
 174
 175         if (priv == NULL) {
 176                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 177                        ERR_R_PASSED_NULL_PARAMETER);
 178                 return 0;
 179         }
 180
 181         if (padding != RSA_PKCS1_PADDING) {
 182                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 183                        RSA_R_UNKNOWN_PADDING_TYPE);
 184                 return 0;
 185         }
 186
 187         if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
 188                 wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
 189                            __func__);
 190                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 191                        RSA_R_INVALID_MESSAGE_LENGTH);
 192                 return 0;
 193         }
 194
 195         if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
 196         {
 197                 cryptoapi_error("CryptCreateHash failed");
 198                 return 0;
 199         }
 200
 201         len = sizeof(hash_size);
 202         if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
 203                                0)) {
 204                 cryptoapi_error("CryptGetHashParam failed");
 205                 goto err;
 206         }
 207
 208         if ((int) hash_size != flen) {
 209                 wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
 210                            (unsigned) hash_size, flen);
 211                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
 212                        RSA_R_INVALID_MESSAGE_LENGTH);
 213                 goto err;
 214         }
 215         if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
 216                 cryptoapi_error("CryptSetHashParam failed");
 217                 goto err;
 218         }
 219
 220         len = RSA_size(rsa);
 221         buf = os_malloc(len);
 222         if (buf == NULL) {
 223                 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
 224                 goto err;
 225         }
 226
 227         if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
 228                 cryptoapi_error("CryptSignHash failed");
 229                 goto err;
 230         }
 231
 232         for (i = 0; i < len; i++)
 233                 to[i] = buf[len - i - 1];
 234         ret = len;
 235
 236 err:
 237         os_free(buf);
 238         CryptDestroyHash(hash);
 239
 240         return ret;
 241 }
 242
 243
 244 static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
 245                                   unsigned char *to, RSA *rsa, int padding)
 246 {
 247         wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
 248         return 0;
 249 }
 250
 251
 252 static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
 253 {
 254         if (priv == NULL)
 255                 return;
 256         if (priv->crypt_prov && priv->free_crypt_prov)
 257                 CryptReleaseContext(priv->crypt_prov, 0);
 258         if (priv->cert)
 259                 CertFreeCertificateContext(priv->cert);
 260         os_free(priv);
 261 }
 262
 263
 264 static int cryptoapi_finish(RSA *rsa)
 265 {
 266         cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
 267         os_free((void *) rsa->meth);
 268         rsa->meth = NULL;
 269         return 1;
 270 }
 271
 272
 273 static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
 274 {
 275         HCERTSTORE cs;
 276         const CERT_CONTEXT *ret = NULL;
 277
 278         cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
 279                            store | CERT_STORE_OPEN_EXISTING_FLAG |
 280                            CERT_STORE_READONLY_FLAG, L"MY");
 281         if (cs == NULL) {
 282                 cryptoapi_error("Failed to open 'My system store'");
 283                 return NULL;
 284         }
 285
 286         if (strncmp(name, "cert://", 7) == 0) {
 287                 unsigned short wbuf[255];
 288                 MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
 289                 ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
 290                                                  PKCS_7_ASN_ENCODING,
 291                                                  0, CERT_FIND_SUBJECT_STR,
 292                                                  wbuf, NULL);
 293         } else if (strncmp(name, "hash://", 7) == 0) {
 294                 CRYPT_HASH_BLOB blob;
 295                 int len;
 296                 const char *hash = name + 7;
 297                 unsigned char *buf;
 298
 299                 len = os_strlen(hash) / 2;
 300                 buf = os_malloc(len);
 301                 if (buf && hexstr2bin(hash, buf, len) == 0) {
 302                         blob.cbData = len;
 303                         blob.pbData = buf;
 304                         ret = CertFindCertificateInStore(cs,
 305                                                          X509_ASN_ENCODING |
 306                                                          PKCS_7_ASN_ENCODING,
 307                                                          0, CERT_FIND_HASH,
 308                                                          &blob, NULL);
 309                 }
 310                 os_free(buf);
 311         }
 312
 313         CertCloseStore(cs, 0);
 314
 315         return ret;
 316 }
 317
 318
 319 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 320 {
 321         X509 *cert = NULL;
 322         RSA *rsa = NULL, *pub_rsa;
 323         struct cryptoapi_rsa_data *priv;
 324         RSA_METHOD *rsa_meth;
 325
 326         if (name == NULL ||
 327             (strncmp(name, "cert://", 7) != 0 &&
 328              strncmp(name, "hash://", 7) != 0))
 329                 return -1;
 330
 331         priv = os_zalloc(sizeof(*priv));
 332         rsa_meth = os_zalloc(sizeof(*rsa_meth));
 333         if (priv == NULL || rsa_meth == NULL) {
 334                 wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
 335                            "for CryptoAPI RSA method");
 336                 os_free(priv);
 337                 os_free(rsa_meth);
 338                 return -1;
 339         }
 340
 341         priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
 342         if (priv->cert == NULL) {
 343                 priv->cert = cryptoapi_find_cert(
 344                         name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
 345         }
 346         if (priv->cert == NULL) {
 347                 wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
 348                            "'%s'", name);
 349                 goto err;
 350         }
 351
 352         cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &priv->cert->pbCertEncoded,
 353                         priv->cert->cbCertEncoded);
 354         if (cert == NULL) {
 355                 wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
 356                            "encoding");
 357                 goto err;
 358         }
 359
 360         if (!CryptAcquireCertificatePrivateKey(priv->cert,
 361                                                CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
 362                                                NULL, &priv->crypt_prov,
 363                                                &priv->key_spec,
 364                                                &priv->free_crypt_prov)) {
 365                 cryptoapi_error("Failed to acquire a private key for the "
 366                                 "certificate");
 367                 goto err;
 368         }
 369
 370         rsa_meth->name = "Microsoft CryptoAPI RSA Method";
 371         rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
 372         rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
 373         rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
 374         rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
 375         rsa_meth->finish = cryptoapi_finish;
 376         rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
 377         rsa_meth->app_data = (char *) priv;
 378
 379         rsa = RSA_new();
 380         if (rsa == NULL) {
 381                 SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
 382                        ERR_R_MALLOC_FAILURE);
 383                 goto err;
 384         }
 385
 386         if (!SSL_use_certificate(ssl, cert)) {
 387                 RSA_free(rsa);
 388                 rsa = NULL;
 389                 goto err;
 390         }
 391         pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
 392         X509_free(cert);
 393         cert = NULL;
 394
 395         rsa->n = BN_dup(pub_rsa->n);
 396         rsa->e = BN_dup(pub_rsa->e);
 397         if (!RSA_set_method(rsa, rsa_meth))
 398                 goto err;
 399
 400         if (!SSL_use_RSAPrivateKey(ssl, rsa))
 401                 goto err;
 402         RSA_free(rsa);
 403
 404         return 0;
 405
 406 err:
 407         if (cert)
 408                 X509_free(cert);
 409         if (rsa)
 410                 RSA_free(rsa);
 411         else {
 412                 os_free(rsa_meth);
 413                 cryptoapi_free_data(priv);
 414         }
 415         return -1;
 416 }
 417
 418
 419 static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
 420 {
 421         HCERTSTORE cs;
 422         PCCERT_CONTEXT ctx = NULL;
 423         X509 *cert;
 424         char buf[128];
 425         const char *store;
 426 #ifdef UNICODE
 427         WCHAR *wstore;
 428 #endif /* UNICODE */
 429
 430         if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
 431                 return -1;
 432
 433         store = name + 13;
 434 #ifdef UNICODE
 435         wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
 436         if (wstore == NULL)
 437                 return -1;
 438         wsprintf(wstore, L"%S", store);
 439         cs = CertOpenSystemStore(0, wstore);
 440         os_free(wstore);
 441 #else /* UNICODE */
 442         cs = CertOpenSystemStore(0, store);
 443 #endif /* UNICODE */
 444         if (cs == NULL) {
 445                 wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
 446                            "'%s': error=%d", __func__, store,
 447                            (int) GetLastError());
 448                 return -1;
 449         }
 450
 451         while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
 452                 cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ctx->pbCertEncoded,
 453                                 ctx->cbCertEncoded);
 454                 if (cert == NULL) {
 455                         wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
 456                                    "X509 DER encoding for CA cert");
 457                         continue;
 458                 }
 459
 460                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
 461                                   sizeof(buf));
 462                 wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
 463                            "system certificate store: subject='%s'", buf);
 464
 465                 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
 466                         tls_show_errors(MSG_WARNING, __func__,
 467                                         "Failed to add ca_cert to OpenSSL "
 468                                         "certificate store");
 469                 }
 470
 471                 X509_free(cert);
 472         }
 473
 474         if (!CertCloseStore(cs, 0)) {
 475                 wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
 476                            "'%s': error=%d", __func__, name + 13,
 477                            (int) GetLastError());
 478         }
 479
 480         return 0;
 481 }
 482
 483
 484 #else /* CONFIG_NATIVE_WINDOWS */
 485
 486 static int tls_cryptoapi_cert(SSL *ssl, const char *name)
 487 {
 488         return -1;
 489 }
 490
 491 #endif /* CONFIG_NATIVE_WINDOWS */
 492
 493
 494 static void ssl_info_cb(const SSL *ssl, int where, int ret)
 495 {
 496         const char *str;
 497         int w;
 498
 499         wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
 500         w = where & ~SSL_ST_MASK;
 501         if (w & SSL_ST_CONNECT)
 502                 str = "SSL_connect";
 503         else if (w & SSL_ST_ACCEPT)
 504                 str = "SSL_accept";
 505         else
 506                 str = "undefined";
 507
 508         if (where & SSL_CB_LOOP) {
 509                 wpa_printf(MSG_DEBUG, "SSL: %s:%s",
 510                            str, SSL_state_string_long(ssl));
 511         } else if (where & SSL_CB_ALERT) {
 512                 wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
 513                            where & SSL_CB_READ ?
 514                            "read (remote end reported an error)" :
 515                            "write (local SSL3 detected an error)",
 516                            SSL_alert_type_string_long(ret),
 517                            SSL_alert_desc_string_long(ret));
 518                 if ((ret >> 8) == SSL3_AL_FATAL) {
 519                         struct tls_connection *conn =
 520                                 SSL_get_app_data((SSL *) ssl);
 521                         if (where & SSL_CB_READ)
 522                                 conn->read_alerts++;
 523                         else
 524                                 conn->write_alerts++;
 525                 }
 526         } else if (where & SSL_CB_EXIT && ret <= 0) {
 527                 wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
 528                            str, ret == 0 ? "failed" : "error",
 529                            SSL_state_string_long(ssl));
 530         }
 531 }
 532
 533
 534 #ifndef OPENSSL_NO_ENGINE
 535 /**
 536  * tls_engine_load_dynamic_generic - load any openssl engine
 537  * @pre: an array of commands and values that load an engine initialized
 538  *       in the engine specific function
 539  * @post: an array of commands and values that initialize an already loaded
 540  *        engine (or %NULL if not required)
 541  * @id: the engine id of the engine to load (only required if post is not %NULL
 542  *
 543  * This function is a generic function that loads any openssl engine.
 544  *
 545  * Returns: 0 on success, -1 on failure
 546  */
 547 static int tls_engine_load_dynamic_generic(const char *pre[],
 548                                            const char *post[], const char *id)
 549 {
 550         ENGINE *engine;
 551         const char *dynamic_id = "dynamic";
 552
 553         engine = ENGINE_by_id(id);
 554         if (engine) {
 555                 ENGINE_free(engine);
 556                 wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
 557                            "available", id);
 558                 return 0;
 559         }
 560         ERR_clear_error();
 561
 562         engine = ENGINE_by_id(dynamic_id);
 563         if (engine == NULL) {
 564                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 565                            dynamic_id,
 566                            ERR_error_string(ERR_get_error(), NULL));
 567                 return -1;
 568         }
 569
 570         /* Perform the pre commands. This will load the engine. */
 571         while (pre && pre[0]) {
 572                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
 573                 if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
 574                         wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
 575                                    "%s %s [%s]", pre[0], pre[1],
 576                                    ERR_error_string(ERR_get_error(), NULL));
 577                         ENGINE_free(engine);
 578                         return -1;
 579                 }
 580                 pre += 2;
 581         }
 582
 583         /*
 584          * Free the reference to the "dynamic" engine. The loaded engine can
 585          * now be looked up using ENGINE_by_id().
 586          */
 587         ENGINE_free(engine);
 588
 589         engine = ENGINE_by_id(id);
 590         if (engine == NULL) {
 591                 wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
 592                            id, ERR_error_string(ERR_get_error(), NULL));
 593                 return -1;
 594         }
 595
 596         while (post && post[0]) {
 597                 wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
 598                 if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
 599                         wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
 600                                 " %s %s [%s]", post[0], post[1],
 601                                    ERR_error_string(ERR_get_error(), NULL));
 602                         ENGINE_remove(engine);
 603                         ENGINE_free(engine);
 604                         return -1;
 605                 }
 606                 post += 2;
 607         }
 608         ENGINE_free(engine);
 609
 610         return 0;
 611 }
 612
 613
 614 /**
 615  * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
 616  * @pkcs11_so_path: pksc11_so_path from the configuration
 617  * @pcks11_module_path: pkcs11_module_path from the configuration
 618  */
 619 static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
 620                                           const char *pkcs11_module_path)
 621 {
 622         char *engine_id = "pkcs11";
 623         const char *pre_cmd[] = {
 624                 "SO_PATH", NULL /* pkcs11_so_path */,
 625                 "ID", NULL /* engine_id */,
 626                 "LIST_ADD", "1",
 627                 /* "NO_VCHECK", "1", */
 628                 "LOAD", NULL,
 629                 NULL, NULL
 630         };
 631         const char *post_cmd[] = {
 632                 "MODULE_PATH", NULL /* pkcs11_module_path */,
 633                 NULL, NULL
 634         };
 635
 636         if (!pkcs11_so_path || !pkcs11_module_path)
 637                 return 0;
 638
 639         pre_cmd[1] = pkcs11_so_path;
 640         pre_cmd[3] = engine_id;
 641         post_cmd[1] = pkcs11_module_path;
 642
 643         wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
 644                    pkcs11_so_path);
 645
 646         return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
 647 }
 648
 649
 650 /**
 651  * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
 652  * @opensc_so_path: opensc_so_path from the configuration
 653  */
 654 static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
 655 {
 656         char *engine_id = "opensc";
 657         const char *pre_cmd[] = {
 658                 "SO_PATH", NULL /* opensc_so_path */,
 659                 "ID", NULL /* engine_id */,
 660                 "LIST_ADD", "1",
 661                 "LOAD", NULL,
 662                 NULL, NULL
 663         };
 664
 665         if (!opensc_so_path)
 666                 return 0;
 667
 668         pre_cmd[1] = opensc_so_path;
 669         pre_cmd[3] = engine_id;
 670
 671         wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
 672                    opensc_so_path);
 673
 674         return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
 675 }
 676 #endif /* OPENSSL_NO_ENGINE */
 677
 678
 679 void * tls_init(const struct tls_config *conf)
 680 {
 681         SSL_CTX *ssl;
 682
 683         if (tls_openssl_ref_count == 0) {
 684                 tls_global = os_zalloc(sizeof(*tls_global));
 685                 if (tls_global == NULL)
 686                         return NULL;
 687                 if (conf) {
 688                         tls_global->event_cb = conf->event_cb;
 689                         tls_global->cb_ctx = conf->cb_ctx;
 690                 }
 691
 692 #ifdef CONFIG_FIPS
 693 #ifdef OPENSSL_FIPS
 694                 if (conf && conf->fips_mode) {
 695                         if (!FIPS_mode_set(1)) {
 696                                 wpa_printf(MSG_ERROR, "Failed to enable FIPS "
 697                                            "mode");
 698                                 ERR_load_crypto_strings();
 699                                 ERR_print_errors_fp(stderr);
 700                                 return NULL;
 701                         } else
 702                                 wpa_printf(MSG_INFO, "Running in FIPS mode");
 703                 }
 704 #else /* OPENSSL_FIPS */
 705                 if (conf && conf->fips_mode) {
 706                         wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
 707                                    "supported");
 708                         return NULL;
 709                 }
 710 #endif /* OPENSSL_FIPS */
 711 #endif /* CONFIG_FIPS */
 712                 SSL_load_error_strings();
 713                 SSL_library_init();
 714 #ifndef OPENSSL_NO_SHA256
 715                 EVP_add_digest(EVP_sha256());
 716 #endif /* OPENSSL_NO_SHA256 */
 717                 /* TODO: if /dev/urandom is available, PRNG is seeded
 718                  * automatically. If this is not the case, random data should
 719                  * be added here. */
 720
 721 #ifdef PKCS12_FUNCS
 722 #ifndef OPENSSL_NO_RC2
 723                 /*
 724                  * 40-bit RC2 is commonly used in PKCS#12 files, so enable it.
 725                  * This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8
 726                  * versions, but it looks like OpenSSL 1.0.0 does not do that
 727                  * anymore.
 728                  */
 729                 EVP_add_cipher(EVP_rc2_40_cbc());
 730 #endif /* OPENSSL_NO_RC2 */
 731                 PKCS12_PBE_add();
 732 #endif  /* PKCS12_FUNCS */
 733         }
 734         tls_openssl_ref_count++;
 735
 736         ssl = SSL_CTX_new(TLSv1_method());
 737         if (ssl == NULL)
 738                 return NULL;
 739
 740         SSL_CTX_set_info_callback(ssl, ssl_info_cb);
 741
 742 #ifndef OPENSSL_NO_ENGINE
 743         if (conf &&
 744             (conf->opensc_engine_path || conf->pkcs11_engine_path ||
 745              conf->pkcs11_module_path)) {
 746                 wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
 747                 ERR_load_ENGINE_strings();
 748                 ENGINE_load_dynamic();
 749
 750                 if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
 751                     tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
 752                                                    conf->pkcs11_module_path)) {
 753                         tls_deinit(ssl);
 754                         return NULL;
 755                 }
 756         }
 757 #endif /* OPENSSL_NO_ENGINE */
 758
 759         return ssl;
 760 }
 761
 762
 763 void tls_deinit(void *ssl_ctx)
 764 {
 765         SSL_CTX *ssl = ssl_ctx;
 766         SSL_CTX_free(ssl);
 767
 768         tls_openssl_ref_count--;
 769         if (tls_openssl_ref_count == 0) {
 770 #ifndef OPENSSL_NO_ENGINE
 771                 ENGINE_cleanup();
 772 #endif /* OPENSSL_NO_ENGINE */
 773                 CRYPTO_cleanup_all_ex_data();
 774                 ERR_remove_state(0);
 775                 ERR_free_strings();
 776                 EVP_cleanup();
 777                 os_free(tls_global);
 778                 tls_global = NULL;
 779         }
 780 }
 781
 782
 783 static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
 784                            const char *pin, const char *key_id,
 785                            const char *cert_id, const char *ca_cert_id)
 786 {
 787 #ifndef OPENSSL_NO_ENGINE
 788         int ret = -1;
 789         if (engine_id == NULL) {
 790                 wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
 791                 return -1;
 792         }
 793         if (pin == NULL) {
 794                 wpa_printf(MSG_ERROR, "ENGINE: Smartcard PIN not set");
 795                 return -1;
 796         }
 797         if (key_id == NULL) {
 798                 wpa_printf(MSG_ERROR, "ENGINE: Key Id not set");
 799                 return -1;
 800         }
 801
 802         ERR_clear_error();
 803         conn->engine = ENGINE_by_id(engine_id);
 804         if (!conn->engine) {
 805                 wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
 806                            engine_id, ERR_error_string(ERR_get_error(), NULL));
 807                 goto err;
 808         }
 809         if (ENGINE_init(conn->engine) != 1) {
 810                 wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
 811                            "(engine: %s) [%s]", engine_id,
 812                            ERR_error_string(ERR_get_error(), NULL));
 813                 goto err;
 814         }
 815         wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");
 816
 817         if (ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
 818                 wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
 819                            ERR_error_string(ERR_get_error(), NULL));
 820                 goto err;
 821         }
 822         /* load private key first in-case PIN is required for cert */
 823         conn->private_key = ENGINE_load_private_key(conn->engine,
 824                                                     key_id, NULL, NULL);
 825         if (!conn->private_key) {
 826                 wpa_printf(MSG_ERROR, "ENGINE: cannot load private key with id"
 827                                 " '%s' [%s]", key_id,
 828                            ERR_error_string(ERR_get_error(), NULL));
 829                 ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
 830                 goto err;
 831         }
 832
 833         /* handle a certificate and/or CA certificate */
 834         if (cert_id || ca_cert_id) {
 835                 const char *cmd_name = "LOAD_CERT_CTRL";
 836
 837                 /* test if the engine supports a LOAD_CERT_CTRL */
 838                 if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
 839                                  0, (void *)cmd_name, NULL)) {
 840                         wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
 841                                    " loading certificates");
 842                         ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
 843                         goto err;
 844                 }
 845         }
 846
 847         return 0;
 848
 849 err:
 850         if (conn->engine) {
 851                 ENGINE_free(conn->engine);
 852                 conn->engine = NULL;
 853         }
 854
 855         if (conn->private_key) {
 856                 EVP_PKEY_free(conn->private_key);
 857                 conn->private_key = NULL;
 858         }
 859
 860         return ret;
 861 #else /* OPENSSL_NO_ENGINE */
 862         return 0;
 863 #endif /* OPENSSL_NO_ENGINE */
 864 }
 865
 866
 867 static void tls_engine_deinit(struct tls_connection *conn)
 868 {
 869 #ifndef OPENSSL_NO_ENGINE
 870         wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
 871         if (conn->private_key) {
 872                 EVP_PKEY_free(conn->private_key);
 873                 conn->private_key = NULL;
 874         }
 875         if (conn->engine) {
 876                 ENGINE_finish(conn->engine);
 877                 conn->engine = NULL;
 878         }
 879 #endif /* OPENSSL_NO_ENGINE */
 880 }
 881
 882
 883 int tls_get_errors(void *ssl_ctx)
 884 {
 885         int count = 0;
 886         unsigned long err;
 887
 888         while ((err = ERR_get_error())) {
 889                 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
 890                            ERR_error_string(err, NULL));
 891                 count++;
 892         }
 893
 894         return count;
 895 }
 896
 897 struct tls_connection * tls_connection_init(void *ssl_ctx)
 898 {
 899         SSL_CTX *ssl = ssl_ctx;
 900         struct tls_connection *conn;
 901         long options;
 902
 903         conn = os_zalloc(sizeof(*conn));
 904         if (conn == NULL)
 905                 return NULL;
 906         conn->ssl = SSL_new(ssl);
 907         if (conn->ssl == NULL) {
 908                 tls_show_errors(MSG_INFO, __func__,
 909                                 "Failed to initialize new SSL connection");
 910                 os_free(conn);
 911                 return NULL;
 912         }
 913
 914         SSL_set_app_data(conn->ssl, conn);
 915         options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
 916                 SSL_OP_SINGLE_DH_USE;
 917 #ifdef SSL_OP_NO_COMPRESSION
 918         options |= SSL_OP_NO_COMPRESSION;
 919 #endif /* SSL_OP_NO_COMPRESSION */
 920         SSL_set_options(conn->ssl, options);
 921
 922         conn->ssl_in = BIO_new(BIO_s_mem());
 923         if (!conn->ssl_in) {
 924                 tls_show_errors(MSG_INFO, __func__,
 925                                 "Failed to create a new BIO for ssl_in");
 926                 SSL_free(conn->ssl);
 927                 os_free(conn);
 928                 return NULL;
 929         }
 930
 931         conn->ssl_out = BIO_new(BIO_s_mem());
 932         if (!conn->ssl_out) {
 933                 tls_show_errors(MSG_INFO, __func__,
 934                                 "Failed to create a new BIO for ssl_out");
 935                 SSL_free(conn->ssl);
 936                 BIO_free(conn->ssl_in);
 937                 os_free(conn);
 938                 return NULL;
 939         }
 940
 941         SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);
 942
 943         return conn;
 944 }
 945
 946
 947 void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
 948 {
 949         if (conn == NULL)
 950                 return;
 951         SSL_free(conn->ssl);
 952         tls_engine_deinit(conn);
 953         os_free(conn->subject_match);
 954         os_free(conn->altsubject_match);
 955         os_free(conn->session_ticket);
 956         os_free(conn);
 957 }
 958
 959
 960 int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
 961 {
 962         return conn ? SSL_is_init_finished(conn->ssl) : 0;
 963 }
 964
 965
 966 int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
 967 {
 968         if (conn == NULL)
 969                 return -1;
 970
 971         /* Shutdown previous TLS connection without notifying the peer
 972          * because the connection was already terminated in practice
 973          * and "close notify" shutdown alert would confuse AS. */
 974         SSL_set_quiet_shutdown(conn->ssl, 1);
 975         SSL_shutdown(conn->ssl);
 976         return 0;
 977 }
 978
 979
 980 static int tls_match_altsubject_component(X509 *cert, int type,
 981                                           const char *value, size_t len)
 982 {
 983         GENERAL_NAME *gen;
 984         void *ext;
 985         int i, found = 0;
 986
 987         ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
 988
 989         for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
 990                 gen = sk_GENERAL_NAME_value(ext, i);
 991                 if (gen->type != type)
 992                         continue;
 993                 if (os_strlen((char *) gen->d.ia5->data) == len &&
 994                     os_memcmp(value, gen->d.ia5->data, len) == 0)
 995                         found++;
 996         }
 997
 998         return found;
 999 }
1000
1001
1002 static int tls_match_altsubject(X509 *cert, const char *match)
1003 {
1004         int type;
1005         const char *pos, *end;
1006         size_t len;
1007
1008         pos = match;
1009         do {
1010                 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
1011                         type = GEN_EMAIL;
1012                         pos += 6;
1013                 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
1014                         type = GEN_DNS;
1015                         pos += 4;
1016                 } else if (os_strncmp(pos, "URI:", 4) == 0) {
1017                         type = GEN_URI;
1018                         pos += 4;
1019                 } else {
1020                         wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
1021                                    "match '%s'", pos);
1022                         return 0;
1023                 }
1024                 end = os_strchr(pos, ';');
1025                 while (end) {
1026                         if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
1027                             os_strncmp(end + 1, "DNS:", 4) == 0 ||
1028                             os_strncmp(end + 1, "URI:", 4) == 0)
1029                                 break;
1030                         end = os_strchr(end + 1, ';');
1031                 }
1032                 if (end)
1033                         len = end - pos;
1034                 else
1035                         len = os_strlen(pos);
1036                 if (tls_match_altsubject_component(cert, type, pos, len) > 0)
1037                         return 1;
1038                 pos = end + 1;
1039         } while (end);
1040
1041         return 0;
1042 }
1043
1044
1045 static enum tls_fail_reason openssl_tls_fail_reason(int err)
1046 {
1047         switch (err) {
1048         case X509_V_ERR_CERT_REVOKED:
1049                 return TLS_FAIL_REVOKED;
1050         case X509_V_ERR_CERT_NOT_YET_VALID:
1051         case X509_V_ERR_CRL_NOT_YET_VALID:
1052                 return TLS_FAIL_NOT_YET_VALID;
1053         case X509_V_ERR_CERT_HAS_EXPIRED:
1054         case X509_V_ERR_CRL_HAS_EXPIRED:
1055                 return TLS_FAIL_EXPIRED;
1056         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
1057         case X509_V_ERR_UNABLE_TO_GET_CRL:
1058         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
1059         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
1060         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
1061         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
1062         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
1063         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
1064         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
1065         case X509_V_ERR_INVALID_CA:
1066                 return TLS_FAIL_UNTRUSTED;
1067         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
1068         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
1069         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
1070         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
1071         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
1072         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
1073         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
1074         case X509_V_ERR_CERT_UNTRUSTED:
1075         case X509_V_ERR_CERT_REJECTED:
1076                 return TLS_FAIL_BAD_CERTIFICATE;
1077         default:
1078                 return TLS_FAIL_UNSPECIFIED;
1079         }
1080 }
1081
1082
1083 static struct wpabuf * get_x509_cert(X509 *cert)
1084 {
1085         struct wpabuf *buf;
1086         u8 *tmp;
1087
1088         int cert_len = i2d_X509(cert, NULL);
1089         if (cert_len <= 0)
1090                 return NULL;
1091
1092         buf = wpabuf_alloc(cert_len);
1093         if (buf == NULL)
1094                 return NULL;
1095
1096         tmp = wpabuf_put(buf, cert_len);
1097         i2d_X509(cert, &tmp);
1098         return buf;
1099 }
1100
1101
1102 static void openssl_tls_fail_event(struct tls_connection *conn,
1103                                    X509 *err_cert, int err, int depth,
1104                                    const char *subject, const char *err_str,
1105                                    enum tls_fail_reason reason)
1106 {
1107         union tls_event_data ev;
1108         struct wpabuf *cert = NULL;
1109
1110         if (tls_global->event_cb == NULL)
1111                 return;
1112
1113         cert = get_x509_cert(err_cert);
1114         os_memset(&ev, 0, sizeof(ev));
1115         ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
1116                 reason : openssl_tls_fail_reason(err);
1117         ev.cert_fail.depth = depth;
1118         ev.cert_fail.subject = subject;
1119         ev.cert_fail.reason_txt = err_str;
1120         ev.cert_fail.cert = cert;
1121         tls_global->event_cb(tls_global->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
1122         wpabuf_free(cert);
1123 }
1124
1125
1126 static void openssl_tls_cert_event(struct tls_connection *conn,
1127                                    X509 *err_cert, int depth,
1128                                    const char *subject)
1129 {
1130         struct wpabuf *cert = NULL;
1131         union tls_event_data ev;
1132 #ifdef CONFIG_SHA256
1133         u8 hash[32];
1134 #endif /* CONFIG_SHA256 */
1135
1136         if (tls_global->event_cb == NULL)
1137                 return;
1138
1139         os_memset(&ev, 0, sizeof(ev));
1140         if (conn->cert_probe) {
1141                 cert = get_x509_cert(err_cert);
1142                 ev.peer_cert.cert = cert;
1143         }
1144 #ifdef CONFIG_SHA256
1145         if (cert) {
1146                 const u8 *addr[1];
1147                 size_t len[1];
1148                 addr[0] = wpabuf_head(cert);
1149                 len[0] = wpabuf_len(cert);
1150                 if (sha256_vector(1, addr, len, hash) == 0) {
1151                         ev.peer_cert.hash = hash;
1152                         ev.peer_cert.hash_len = sizeof(hash);
1153                 }
1154         }
1155 #endif /* CONFIG_SHA256 */
1156         ev.peer_cert.depth = depth;
1157         ev.peer_cert.subject = subject;
1158         tls_global->event_cb(tls_global->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
1159         wpabuf_free(cert);
1160 }
1161
1162
1163 static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
1164 {
1165         char buf[256];
1166         X509 *err_cert;
1167         int err, depth;
1168         SSL *ssl;
1169         struct tls_connection *conn;
1170         char *match, *altmatch;
1171         const char *err_str;
1172
1173         err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
1174         err = X509_STORE_CTX_get_error(x509_ctx);
1175         depth = X509_STORE_CTX_get_error_depth(x509_ctx);
1176         ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
1177                                          SSL_get_ex_data_X509_STORE_CTX_idx());
1178         X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));
1179
1180         conn = SSL_get_app_data(ssl);
1181         match = conn ? conn->subject_match : NULL;
1182         altmatch = conn ? conn->altsubject_match : NULL;
1183
1184         if (!preverify_ok && !conn->ca_cert_verify)
1185                 preverify_ok = 1;
1186         if (!preverify_ok && depth > 0 && conn->server_cert_only)
1187                 preverify_ok = 1;
1188
1189         err_str = X509_verify_cert_error_string(err);
1190
1191 #ifdef CONFIG_SHA256
1192         if (preverify_ok && depth == 0 && conn->server_cert_only) {
1193                 struct wpabuf *cert;
1194                 cert = get_x509_cert(err_cert);
1195                 if (!cert) {
1196                         wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch "
1197                                    "server certificate data");
1198                         preverify_ok = 0;
1199                 } else {
1200                         u8 hash[32];
1201                         const u8 *addr[1];
1202                         size_t len[1];
1203                         addr[0] = wpabuf_head(cert);
1204                         len[0] = wpabuf_len(cert);
1205                         if (sha256_vector(1, addr, len, hash) < 0 ||
1206                             os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
1207                                 err_str = "Server certificate mismatch";
1208                                 err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
1209                                 preverify_ok = 0;
1210                         }
1211                         wpabuf_free(cert);
1212                 }
1213         }
1214 #endif /* CONFIG_SHA256 */
1215
1216         if (!preverify_ok) {
1217                 wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
1218                            " error %d (%s) depth %d for '%s'", err, err_str,
1219                            depth, buf);
1220                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1221                                        err_str, TLS_FAIL_UNSPECIFIED);
1222                 return preverify_ok;
1223         }
1224
1225         wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d "
1226                    "err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
1227                    preverify_ok, err, err_str,
1228                    conn->ca_cert_verify, depth, buf);
1229         if (depth == 0 && match && os_strstr(buf, match) == NULL) {
1230                 wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
1231                            "match with '%s'", buf, match);
1232                 preverify_ok = 0;
1233                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1234                                        "Subject mismatch",
1235                                        TLS_FAIL_SUBJECT_MISMATCH);
1236         } else if (depth == 0 && altmatch &&
1237                    !tls_match_altsubject(err_cert, altmatch)) {
1238                 wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
1239                            "'%s' not found", altmatch);
1240                 preverify_ok = 0;
1241                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1242                                        "AltSubject mismatch",
1243                                        TLS_FAIL_ALTSUBJECT_MISMATCH);
1244         } else
1245                 openssl_tls_cert_event(conn, err_cert, depth, buf);
1246
1247         if (conn->cert_probe && preverify_ok && depth == 0) {
1248                 wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate "
1249                            "on probe-only run");
1250                 preverify_ok = 0;
1251                 openssl_tls_fail_event(conn, err_cert, err, depth, buf,
1252                                        "Server certificate chain probe",
1253                                        TLS_FAIL_SERVER_CHAIN_PROBE);
1254         }
1255
1256         return preverify_ok;
1257 }
1258
1259
1260 #ifndef OPENSSL_NO_STDIO
1261 static int tls_load_ca_der(void *_ssl_ctx, const char *ca_cert)
1262 {
1263         SSL_CTX *ssl_ctx = _ssl_ctx;
1264         X509_LOOKUP *lookup;
1265         int ret = 0;
1266
1267         lookup = X509_STORE_add_lookup(ssl_ctx->cert_store,
1268                                        X509_LOOKUP_file());
1269         if (lookup == NULL) {
1270                 tls_show_errors(MSG_WARNING, __func__,
1271                                 "Failed add lookup for X509 store");
1272                 return -1;
1273         }
1274
1275         if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
1276                 unsigned long err = ERR_peek_error();
1277                 tls_show_errors(MSG_WARNING, __func__,
1278                                 "Failed load CA in DER format");
1279                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1280                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1281                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1282                                    "cert already in hash table error",
1283                                    __func__);
1284                 } else
1285                         ret = -1;
1286         }
1287
1288         return ret;
1289 }
1290 #endif /* OPENSSL_NO_STDIO */
1291
1292
1293 static int tls_connection_ca_cert(void *_ssl_ctx, struct tls_connection *conn,
1294                                   const char *ca_cert, const u8 *ca_cert_blob,
1295                                   size_t ca_cert_blob_len, const char *ca_path)
1296 {
1297         SSL_CTX *ssl_ctx = _ssl_ctx;
1298
1299         /*
1300          * Remove previously configured trusted CA certificates before adding
1301          * new ones.
1302          */
1303         X509_STORE_free(ssl_ctx->cert_store);
1304         ssl_ctx->cert_store = X509_STORE_new();
1305         if (ssl_ctx->cert_store == NULL) {
1306                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1307                            "certificate store", __func__);
1308                 return -1;
1309         }
1310
1311         SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1312         conn->ca_cert_verify = 1;
1313
1314         if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
1315                 wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate "
1316                            "chain");
1317                 conn->cert_probe = 1;
1318                 conn->ca_cert_verify = 0;
1319                 return 0;
1320         }
1321
1322         if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
1323 #ifdef CONFIG_SHA256
1324                 const char *pos = ca_cert + 7;
1325                 if (os_strncmp(pos, "server/sha256/", 14) != 0) {
1326                         wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert "
1327                                    "hash value '%s'", ca_cert);
1328                         return -1;
1329                 }
1330                 pos += 14;
1331                 if (os_strlen(pos) != 32 * 2) {
1332                         wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 "
1333                                    "hash length in ca_cert '%s'", ca_cert);
1334                         return -1;
1335                 }
1336                 if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
1337                         wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash "
1338                                    "value in ca_cert '%s'", ca_cert);
1339                         return -1;
1340                 }
1341                 conn->server_cert_only = 1;
1342                 wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server "
1343                            "certificate match");
1344                 return 0;
1345 #else /* CONFIG_SHA256 */
1346                 wpa_printf(MSG_INFO, "No SHA256 included in the build - "
1347                            "cannot validate server certificate hash");
1348                 return -1;
1349 #endif /* CONFIG_SHA256 */
1350         }
1351
1352         if (ca_cert_blob) {
1353                 X509 *cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ca_cert_blob,
1354                                       ca_cert_blob_len);
1355                 if (cert == NULL) {
1356                         tls_show_errors(MSG_WARNING, __func__,
1357                                         "Failed to parse ca_cert_blob");
1358                         return -1;
1359                 }
1360
1361                 if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
1362                         unsigned long err = ERR_peek_error();
1363                         tls_show_errors(MSG_WARNING, __func__,
1364                                         "Failed to add ca_cert_blob to "
1365                                         "certificate store");
1366                         if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1367                             ERR_GET_REASON(err) ==
1368                             X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1369                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
1370                                            "cert already in hash table error",
1371                                            __func__);
1372                         } else {
1373                                 X509_free(cert);
1374                                 return -1;
1375                         }
1376                 }
1377                 X509_free(cert);
1378                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
1379                            "to certificate store", __func__);
1380                 return 0;
1381         }
1382
1383 #ifdef CONFIG_NATIVE_WINDOWS
1384         if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
1385             0) {
1386                 wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
1387                            "system certificate store");
1388                 return 0;
1389         }
1390 #endif /* CONFIG_NATIVE_WINDOWS */
1391
1392         if (ca_cert || ca_path) {
1393 #ifndef OPENSSL_NO_STDIO
1394                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
1395                     1) {
1396                         tls_show_errors(MSG_WARNING, __func__,
1397                                         "Failed to load root certificates");
1398                         if (ca_cert &&
1399                             tls_load_ca_der(ssl_ctx, ca_cert) == 0) {
1400                                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
1401                                            "DER format CA certificate",
1402                                            __func__);
1403                         } else
1404                                 return -1;
1405                 } else {
1406                         wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1407                                    "certificate(s) loaded");
1408                         tls_get_errors(ssl_ctx);
1409                 }
1410 #else /* OPENSSL_NO_STDIO */
1411                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1412                            __func__);
1413                 return -1;
1414 #endif /* OPENSSL_NO_STDIO */
1415         } else {
1416                 /* No ca_cert configured - do not try to verify server
1417                  * certificate */
1418                 conn->ca_cert_verify = 0;
1419         }
1420
1421         return 0;
1422 }
1423
1424
1425 static int tls_global_ca_cert(SSL_CTX *ssl_ctx, const char *ca_cert)
1426 {
1427         if (ca_cert) {
1428                 if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
1429                 {
1430                         tls_show_errors(MSG_WARNING, __func__,
1431                                         "Failed to load root certificates");
1432                         return -1;
1433                 }
1434
1435                 wpa_printf(MSG_DEBUG, "TLS: Trusted root "
1436                            "certificate(s) loaded");
1437
1438 #ifndef OPENSSL_NO_STDIO
1439                 /* Add the same CAs to the client certificate requests */
1440                 SSL_CTX_set_client_CA_list(ssl_ctx,
1441                                            SSL_load_client_CA_file(ca_cert));
1442 #endif /* OPENSSL_NO_STDIO */
1443         }
1444
1445         return 0;
1446 }
1447
1448
1449 int tls_global_set_verify(void *ssl_ctx, int check_crl)
1450 {
1451         int flags;
1452
1453         if (check_crl) {
1454                 X509_STORE *cs = SSL_CTX_get_cert_store(ssl_ctx);
1455                 if (cs == NULL) {
1456                         tls_show_errors(MSG_INFO, __func__, "Failed to get "
1457                                         "certificate store when enabling "
1458                                         "check_crl");
1459                         return -1;
1460                 }
1461                 flags = X509_V_FLAG_CRL_CHECK;
1462                 if (check_crl == 2)
1463                         flags |= X509_V_FLAG_CRL_CHECK_ALL;
1464                 X509_STORE_set_flags(cs, flags);
1465         }
1466         return 0;
1467 }
1468
1469
1470 static int tls_connection_set_subject_match(struct tls_connection *conn,
1471                                             const char *subject_match,
1472                                             const char *altsubject_match)
1473 {
1474         os_free(conn->subject_match);
1475         conn->subject_match = NULL;
1476         if (subject_match) {
1477                 conn->subject_match = os_strdup(subject_match);
1478                 if (conn->subject_match == NULL)
1479                         return -1;
1480         }
1481
1482         os_free(conn->altsubject_match);
1483         conn->altsubject_match = NULL;
1484         if (altsubject_match) {
1485                 conn->altsubject_match = os_strdup(altsubject_match);
1486                 if (conn->altsubject_match == NULL)
1487                         return -1;
1488         }
1489
1490         return 0;
1491 }
1492
1493
1494 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
1495                               int verify_peer)
1496 {
1497         static int counter = 0;
1498
1499         if (conn == NULL)
1500                 return -1;
1501
1502         if (verify_peer) {
1503                 conn->ca_cert_verify = 1;
1504                 SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
1505                                SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
1506                                SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
1507         } else {
1508                 conn->ca_cert_verify = 0;
1509                 SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
1510         }
1511
1512         SSL_set_accept_state(conn->ssl);
1513
1514         /*
1515          * Set session id context in order to avoid fatal errors when client
1516          * tries to resume a session. However, set the context to a unique
1517          * value in order to effectively disable session resumption for now
1518          * since not all areas of the server code are ready for it (e.g.,
1519          * EAP-TTLS needs special handling for Phase 2 after abbreviated TLS
1520          * handshake).
1521          */
1522         counter++;
1523         SSL_set_session_id_context(conn->ssl,
1524                                    (const unsigned char *) &counter,
1525                                    sizeof(counter));
1526
1527         return 0;
1528 }
1529
1530
1531 static int tls_connection_client_cert(struct tls_connection *conn,
1532                                       const char *client_cert,
1533                                       const u8 *client_cert_blob,
1534                                       size_t client_cert_blob_len)
1535 {
1536         if (client_cert == NULL && client_cert_blob == NULL)
1537                 return 0;
1538
1539         if (client_cert_blob &&
1540             SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
1541                                      client_cert_blob_len) == 1) {
1542                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
1543                            "OK");
1544                 return 0;
1545         } else if (client_cert_blob) {
1546                 tls_show_errors(MSG_DEBUG, __func__,
1547                                 "SSL_use_certificate_ASN1 failed");
1548         }
1549
1550         if (client_cert == NULL)
1551                 return -1;
1552
1553 #ifndef OPENSSL_NO_STDIO
1554         if (SSL_use_certificate_file(conn->ssl, client_cert,
1555                                      SSL_FILETYPE_ASN1) == 1) {
1556                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
1557                            " --> OK");
1558                 return 0;
1559         } else {
1560                 tls_show_errors(MSG_DEBUG, __func__,
1561                                 "SSL_use_certificate_file (DER) failed");
1562         }
1563
1564         if (SSL_use_certificate_file(conn->ssl, client_cert,
1565                                      SSL_FILETYPE_PEM) == 1) {
1566                 wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
1567                            " --> OK");
1568                 return 0;
1569         } else {
1570                 tls_show_errors(MSG_DEBUG, __func__,
1571                                 "SSL_use_certificate_file (PEM) failed");
1572         }
1573 #else /* OPENSSL_NO_STDIO */
1574         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1575 #endif /* OPENSSL_NO_STDIO */
1576
1577         return -1;
1578 }
1579
1580
1581 static int tls_global_client_cert(SSL_CTX *ssl_ctx, const char *client_cert)
1582 {
1583 #ifndef OPENSSL_NO_STDIO
1584         if (client_cert == NULL)
1585                 return 0;
1586
1587         if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1588                                          SSL_FILETYPE_ASN1) != 1 &&
1589             SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
1590                                          SSL_FILETYPE_PEM) != 1) {
1591                 tls_show_errors(MSG_INFO, __func__,
1592                                 "Failed to load client certificate");
1593                 return -1;
1594         }
1595         return 0;
1596 #else /* OPENSSL_NO_STDIO */
1597         if (client_cert == NULL)
1598                 return 0;
1599         wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
1600         return -1;
1601 #endif /* OPENSSL_NO_STDIO */
1602 }
1603
1604
1605 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
1606 {
1607         if (password == NULL) {
1608                 return 0;
1609         }
1610         os_strlcpy(buf, (char *) password, size);
1611         return os_strlen(buf);
1612 }
1613
1614
1615 #ifdef PKCS12_FUNCS
1616 static int tls_parse_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, PKCS12 *p12,
1617                             const char *passwd)
1618 {
1619         EVP_PKEY *pkey;
1620         X509 *cert;
1621         STACK_OF(X509) *certs;
1622         int res = 0;
1623         char buf[256];
1624
1625         pkey = NULL;
1626         cert = NULL;
1627         certs = NULL;
1628         if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
1629                 tls_show_errors(MSG_DEBUG, __func__,
1630                                 "Failed to parse PKCS12 file");
1631                 PKCS12_free(p12);
1632                 return -1;
1633         }
1634         wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");
1635
1636         if (cert) {
1637                 X509_NAME_oneline(X509_get_subject_name(cert), buf,
1638                                   sizeof(buf));
1639                 wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
1640                            "subject='%s'", buf);
1641                 if (ssl) {
1642                         if (SSL_use_certificate(ssl, cert) != 1)
1643                                 res = -1;
1644                 } else {
1645                         if (SSL_CTX_use_certificate(ssl_ctx, cert) != 1)
1646                                 res = -1;
1647                 }
1648                 X509_free(cert);
1649         }
1650
1651         if (pkey) {
1652                 wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
1653                 if (ssl) {
1654                         if (SSL_use_PrivateKey(ssl, pkey) != 1)
1655                                 res = -1;
1656                 } else {
1657                         if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1)
1658                                 res = -1;
1659                 }
1660                 EVP_PKEY_free(pkey);
1661         }
1662
1663         if (certs) {
1664                 while ((cert = sk_X509_pop(certs)) != NULL) {
1665                         X509_NAME_oneline(X509_get_subject_name(cert), buf,
1666                                           sizeof(buf));
1667                         wpa_printf(MSG_DEBUG, "TLS: additional certificate"
1668                                    " from PKCS12: subject='%s'", buf);
1669                         /*
1670                          * There is no SSL equivalent for the chain cert - so
1671                          * always add it to the context...
1672                          */
1673                         if (SSL_CTX_add_extra_chain_cert(ssl_ctx, cert) != 1) {
1674                                 res = -1;
1675                                 break;
1676                         }
1677                 }
1678                 sk_X509_free(certs);
1679         }
1680
1681         PKCS12_free(p12);
1682
1683         if (res < 0)
1684                 tls_get_errors(ssl_ctx);
1685
1686         return res;
1687 }
1688 #endif  /* PKCS12_FUNCS */
1689
1690
1691 static int tls_read_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, const char *private_key,
1692                            const char *passwd)
1693 {
1694 #ifdef PKCS12_FUNCS
1695         FILE *f;
1696         PKCS12 *p12;
1697
1698         f = fopen(private_key, "rb");
1699         if (f == NULL)
1700                 return -1;
1701
1702         p12 = d2i_PKCS12_fp(f, NULL);
1703         fclose(f);
1704
1705         if (p12 == NULL) {
1706                 tls_show_errors(MSG_INFO, __func__,
1707                                 "Failed to use PKCS#12 file");
1708                 return -1;
1709         }
1710
1711         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1712
1713 #else /* PKCS12_FUNCS */
1714         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
1715                    "p12/pfx files");
1716         return -1;
1717 #endif  /* PKCS12_FUNCS */
1718 }
1719
1720
1721 static int tls_read_pkcs12_blob(SSL_CTX *ssl_ctx, SSL *ssl,
1722                                 const u8 *blob, size_t len, const char *passwd)
1723 {
1724 #ifdef PKCS12_FUNCS
1725         PKCS12 *p12;
1726
1727         p12 = d2i_PKCS12(NULL, (OPENSSL_d2i_TYPE) &blob, len);
1728         if (p12 == NULL) {
1729                 tls_show_errors(MSG_INFO, __func__,
1730                                 "Failed to use PKCS#12 blob");
1731                 return -1;
1732         }
1733
1734         return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);
1735
1736 #else /* PKCS12_FUNCS */
1737         wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
1738                    "p12/pfx blobs");
1739         return -1;
1740 #endif  /* PKCS12_FUNCS */
1741 }
1742
1743
1744 #ifndef OPENSSL_NO_ENGINE
1745 static int tls_engine_get_cert(struct tls_connection *conn,
1746                                const char *cert_id,
1747                                X509 **cert)
1748 {
1749         /* this runs after the private key is loaded so no PIN is required */
1750         struct {
1751                 const char *cert_id;
1752                 X509 *cert;
1753         } params;
1754         params.cert_id = cert_id;
1755         params.cert = NULL;
1756
1757         if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
1758                              0, &params, NULL, 1)) {
1759                 wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
1760                            " '%s' [%s]", cert_id,
1761                            ERR_error_string(ERR_get_error(), NULL));
1762                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1763         }
1764         if (!params.cert) {
1765                 wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
1766                            " '%s'", cert_id);
1767                 return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
1768         }
1769         *cert = params.cert;
1770         return 0;
1771 }
1772 #endif /* OPENSSL_NO_ENGINE */
1773
1774
1775 static int tls_connection_engine_client_cert(struct tls_connection *conn,
1776                                              const char *cert_id)
1777 {
1778 #ifndef OPENSSL_NO_ENGINE
1779         X509 *cert;
1780
1781         if (tls_engine_get_cert(conn, cert_id, &cert))
1782                 return -1;
1783
1784         if (!SSL_use_certificate(conn->ssl, cert)) {
1785                 tls_show_errors(MSG_ERROR, __func__,
1786                                 "SSL_use_certificate failed");
1787                 X509_free(cert);
1788                 return -1;
1789         }
1790         X509_free(cert);
1791         wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
1792                    "OK");
1793         return 0;
1794
1795 #else /* OPENSSL_NO_ENGINE */
1796         return -1;
1797 #endif /* OPENSSL_NO_ENGINE */
1798 }
1799
1800
1801 static int tls_connection_engine_ca_cert(void *_ssl_ctx,
1802                                          struct tls_connection *conn,
1803                                          const char *ca_cert_id)
1804 {
1805 #ifndef OPENSSL_NO_ENGINE
1806         X509 *cert;
1807         SSL_CTX *ssl_ctx = _ssl_ctx;
1808
1809         if (tls_engine_get_cert(conn, ca_cert_id, &cert))
1810                 return -1;
1811
1812         /* start off the same as tls_connection_ca_cert */
1813         X509_STORE_free(ssl_ctx->cert_store);
1814         ssl_ctx->cert_store = X509_STORE_new();
1815         if (ssl_ctx->cert_store == NULL) {
1816                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
1817                            "certificate store", __func__);
1818                 X509_free(cert);
1819                 return -1;
1820         }
1821         if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
1822                 unsigned long err = ERR_peek_error();
1823                 tls_show_errors(MSG_WARNING, __func__,
1824                                 "Failed to add CA certificate from engine "
1825                                 "to certificate store");
1826                 if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
1827                     ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
1828                         wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
1829                                    " already in hash table error",
1830                                    __func__);
1831                 } else {
1832                         X509_free(cert);
1833                         return -1;
1834                 }
1835         }
1836         X509_free(cert);
1837         wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
1838                    "to certificate store", __func__);
1839         SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1840         return 0;
1841
1842 #else /* OPENSSL_NO_ENGINE */
1843         return -1;
1844 #endif /* OPENSSL_NO_ENGINE */
1845 }
1846
1847
1848 static int tls_connection_engine_private_key(struct tls_connection *conn)
1849 {
1850 #ifndef OPENSSL_NO_ENGINE
1851         if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
1852                 tls_show_errors(MSG_ERROR, __func__,
1853                                 "ENGINE: cannot use private key for TLS");
1854                 return -1;
1855         }
1856         if (!SSL_check_private_key(conn->ssl)) {
1857                 tls_show_errors(MSG_INFO, __func__,
1858                                 "Private key failed verification");
1859                 return -1;
1860         }
1861         return 0;
1862 #else /* OPENSSL_NO_ENGINE */
1863         wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
1864                    "engine support was not compiled in");
1865         return -1;
1866 #endif /* OPENSSL_NO_ENGINE */
1867 }
1868
1869
1870 static int tls_connection_private_key(void *_ssl_ctx,
1871                                       struct tls_connection *conn,
1872                                       const char *private_key,
1873                                       const char *private_key_passwd,
1874                                       const u8 *private_key_blob,
1875                                       size_t private_key_blob_len)
1876 {
1877         SSL_CTX *ssl_ctx = _ssl_ctx;
1878         char *passwd;
1879         int ok;
1880
1881         if (private_key == NULL && private_key_blob == NULL)
1882                 return 0;
1883
1884         if (private_key_passwd) {
1885                 passwd = os_strdup(private_key_passwd);
1886                 if (passwd == NULL)
1887                         return -1;
1888         } else
1889                 passwd = NULL;
1890
1891         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
1892         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
1893
1894         ok = 0;
1895         while (private_key_blob) {
1896                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
1897                                             (u8 *) private_key_blob,
1898                                             private_key_blob_len) == 1) {
1899                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
1900                                    "ASN1(EVP_PKEY_RSA) --> OK");
1901                         ok = 1;
1902                         break;
1903                 } else {
1904                         tls_show_errors(MSG_DEBUG, __func__,
1905                                         "SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA)"
1906                                         " failed");
1907                 }
1908
1909                 if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
1910                                             (u8 *) private_key_blob,
1911                                             private_key_blob_len) == 1) {
1912                         wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
1913                                    "ASN1(EVP_PKEY_DSA) --> OK");
1914                         ok = 1;
1915                         break;
1916                 } else {
1917                         tls_show_errors(MSG_DEBUG, __func__,
1918                                         "SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA)"
1919                                         " failed");
1920                 }
1921
1922                 if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
1923                                                (u8 *) private_key_blob,
1924                                                private_key_blob_len) == 1) {
1925                         wpa_printf(MSG_DEBUG, "OpenSSL: "
1926                                    "SSL_use_RSAPrivateKey_ASN1 --> OK");
1927                         ok = 1;
1928                         break;
1929                 } else {
1930                         tls_show_errors(MSG_DEBUG, __func__,
1931                                         "SSL_use_RSAPrivateKey_ASN1 failed");
1932                 }
1933
1934                 if (tls_read_pkcs12_blob(ssl_ctx, conn->ssl, private_key_blob,
1935                                          private_key_blob_len, passwd) == 0) {
1936                         wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
1937                                    "OK");
1938                         ok = 1;
1939                         break;
1940                 }
1941
1942                 break;
1943         }
1944
1945         while (!ok && private_key) {
1946 #ifndef OPENSSL_NO_STDIO
1947                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
1948                                             SSL_FILETYPE_ASN1) == 1) {
1949                         wpa_printf(MSG_DEBUG, "OpenSSL: "
1950                                    "SSL_use_PrivateKey_File (DER) --> OK");
1951                         ok = 1;
1952                         break;
1953                 } else {
1954                         tls_show_errors(MSG_DEBUG, __func__,
1955                                         "SSL_use_PrivateKey_File (DER) "
1956                                         "failed");
1957                 }
1958
1959                 if (SSL_use_PrivateKey_file(conn->ssl, private_key,
1960                                             SSL_FILETYPE_PEM) == 1) {
1961                         wpa_printf(MSG_DEBUG, "OpenSSL: "
1962                                    "SSL_use_PrivateKey_File (PEM) --> OK");
1963                         ok = 1;
1964                         break;
1965                 } else {
1966                         tls_show_errors(MSG_DEBUG, __func__,
1967                                         "SSL_use_PrivateKey_File (PEM) "
1968                                         "failed");
1969                 }
1970 #else /* OPENSSL_NO_STDIO */
1971                 wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
1972                            __func__);
1973 #endif /* OPENSSL_NO_STDIO */
1974
1975                 if (tls_read_pkcs12(ssl_ctx, conn->ssl, private_key, passwd)
1976                     == 0) {
1977                         wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
1978                                    "--> OK");
1979                         ok = 1;
1980                         break;
1981                 }
1982
1983                 if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
1984                         wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
1985                                    "access certificate store --> OK");
1986                         ok = 1;
1987                         break;
1988                 }
1989
1990                 break;
1991         }
1992
1993         if (!ok) {
1994                 wpa_printf(MSG_INFO, "OpenSSL: Failed to load private key");
1995                 os_free(passwd);
1996                 ERR_clear_error();
1997                 return -1;
1998         }
1999         ERR_clear_error();
2000         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2001         os_free(passwd);
2002
2003         if (!SSL_check_private_key(conn->ssl)) {
2004                 tls_show_errors(MSG_INFO, __func__, "Private key failed "
2005                                 "verification");
2006                 return -1;
2007         }
2008
2009         wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
2010         return 0;
2011 }
2012
2013
2014 static int tls_global_private_key(SSL_CTX *ssl_ctx, const char *private_key,
2015                                   const char *private_key_passwd)
2016 {
2017         char *passwd;
2018
2019         if (private_key == NULL)
2020                 return 0;
2021
2022         if (private_key_passwd) {
2023                 passwd = os_strdup(private_key_passwd);
2024                 if (passwd == NULL)
2025                         return -1;
2026         } else
2027                 passwd = NULL;
2028
2029         SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
2030         SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
2031         if (
2032 #ifndef OPENSSL_NO_STDIO
2033             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2034                                         SSL_FILETYPE_ASN1) != 1 &&
2035             SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
2036                                         SSL_FILETYPE_PEM) != 1 &&
2037 #endif /* OPENSSL_NO_STDIO */
2038             tls_read_pkcs12(ssl_ctx, NULL, private_key, passwd)) {
2039                 tls_show_errors(MSG_INFO, __func__,
2040                                 "Failed to load private key");
2041                 os_free(passwd);
2042                 ERR_clear_error();
2043                 return -1;
2044         }
2045         os_free(passwd);
2046         ERR_clear_error();
2047         SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
2048
2049         if (!SSL_CTX_check_private_key(ssl_ctx)) {
2050                 tls_show_errors(MSG_INFO, __func__,
2051                                 "Private key failed verification");
2052                 return -1;
2053         }
2054
2055         return 0;
2056 }
2057
2058
2059 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
2060 {
2061 #ifdef OPENSSL_NO_DH
2062         if (dh_file == NULL)
2063                 return 0;
2064         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2065                    "dh_file specified");
2066         return -1;
2067 #else /* OPENSSL_NO_DH */
2068         DH *dh;
2069         BIO *bio;
2070
2071         /* TODO: add support for dh_blob */
2072         if (dh_file == NULL)
2073                 return 0;
2074         if (conn == NULL)
2075                 return -1;
2076
2077         bio = BIO_new_file(dh_file, "r");
2078         if (bio == NULL) {
2079                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
2080                            dh_file, ERR_error_string(ERR_get_error(), NULL));
2081                 return -1;
2082         }
2083         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
2084         BIO_free(bio);
2085 #ifndef OPENSSL_NO_DSA
2086         while (dh == NULL) {
2087                 DSA *dsa;
2088                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
2089                            " trying to parse as DSA params", dh_file,
2090                            ERR_error_string(ERR_get_error(), NULL));
2091                 bio = BIO_new_file(dh_file, "r");
2092                 if (bio == NULL)
2093                         break;
2094                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
2095                 BIO_free(bio);
2096                 if (!dsa) {
2097                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
2098                                    "'%s': %s", dh_file,
2099                                    ERR_error_string(ERR_get_error(), NULL));
2100                         break;
2101                 }
2102
2103                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2104                 dh = DSA_dup_DH(dsa);
2105                 DSA_free(dsa);
2106                 if (dh == NULL) {
2107                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2108                                    "params into DH params");
2109                         break;
2110                 }
2111                 break;
2112         }
2113 #endif /* !OPENSSL_NO_DSA */
2114         if (dh == NULL) {
2115                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2116                            "'%s'", dh_file);
2117                 return -1;
2118         }
2119
2120         if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
2121                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2122                            "%s", dh_file,
2123                            ERR_error_string(ERR_get_error(), NULL));
2124                 DH_free(dh);
2125                 return -1;
2126         }
2127         DH_free(dh);
2128         return 0;
2129 #endif /* OPENSSL_NO_DH */
2130 }
2131
2132
2133 static int tls_global_dh(SSL_CTX *ssl_ctx, const char *dh_file)
2134 {
2135 #ifdef OPENSSL_NO_DH
2136         if (dh_file == NULL)
2137                 return 0;
2138         wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
2139                    "dh_file specified");
2140         return -1;
2141 #else /* OPENSSL_NO_DH */
2142         DH *dh;
2143         BIO *bio;
2144
2145         /* TODO: add support for dh_blob */
2146         if (dh_file == NULL)
2147                 return 0;
2148         if (ssl_ctx == NULL)
2149                 return -1;
2150
2151         bio = BIO_new_file(dh_file, "r");
2152         if (bio == NULL) {
2153                 wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
2154                            dh_file, ERR_error_string(ERR_get_error(), NULL));
2155                 return -1;
2156         }
2157         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
2158         BIO_free(bio);
2159 #ifndef OPENSSL_NO_DSA
2160         while (dh == NULL) {
2161                 DSA *dsa;
2162                 wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
2163                            " trying to parse as DSA params", dh_file,
2164                            ERR_error_string(ERR_get_error(), NULL));
2165                 bio = BIO_new_file(dh_file, "r");
2166                 if (bio == NULL)
2167                         break;
2168                 dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
2169                 BIO_free(bio);
2170                 if (!dsa) {
2171                         wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
2172                                    "'%s': %s", dh_file,
2173                                    ERR_error_string(ERR_get_error(), NULL));
2174                         break;
2175                 }
2176
2177                 wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
2178                 dh = DSA_dup_DH(dsa);
2179                 DSA_free(dsa);
2180                 if (dh == NULL) {
2181                         wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
2182                                    "params into DH params");
2183                         break;
2184                 }
2185                 break;
2186         }
2187 #endif /* !OPENSSL_NO_DSA */
2188         if (dh == NULL) {
2189                 wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
2190                            "'%s'", dh_file);
2191                 return -1;
2192         }
2193
2194         if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
2195                 wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
2196                            "%s", dh_file,
2197                            ERR_error_string(ERR_get_error(), NULL));
2198                 DH_free(dh);
2199                 return -1;
2200         }
2201         DH_free(dh);
2202         return 0;
2203 #endif /* OPENSSL_NO_DH */
2204 }
2205
2206
2207 int tls_connection_get_keys(void *ssl_ctx, struct tls_connection *conn,
2208                             struct tls_keys *keys)
2209 {
2210         SSL *ssl;
2211
2212         if (conn == NULL || keys == NULL)
2213                 return -1;
2214         ssl = conn->ssl;
2215         if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL)
2216                 return -1;
2217
2218         os_memset(keys, 0, sizeof(*keys));
2219         keys->master_key = ssl->session->master_key;
2220         keys->master_key_len = ssl->session->master_key_length;
2221         keys->client_random = ssl->s3->client_random;
2222         keys->client_random_len = SSL3_RANDOM_SIZE;
2223         keys->server_random = ssl->s3->server_random;
2224         keys->server_random_len = SSL3_RANDOM_SIZE;
2225
2226         return 0;
2227 }
2228
2229
2230 int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
2231                        const char *label, int server_random_first,
2232                        u8 *out, size_t out_len)
2233 {
2234         return -1;
2235 }
2236
2237
2238 static struct wpabuf *
2239 openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data,
2240                   int server)
2241 {
2242         int res;
2243         struct wpabuf *out_data;
2244
2245         /*
2246          * Give TLS handshake data from the server (if available) to OpenSSL
2247          * for processing.
2248          */
2249         if (in_data &&
2250             BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
2251             < 0) {
2252                 tls_show_errors(MSG_INFO, __func__,
2253                                 "Handshake failed - BIO_write");
2254                 return NULL;
2255         }
2256
2257         /* Initiate TLS handshake or continue the existing handshake */
2258         if (server)
2259                 res = SSL_accept(conn->ssl);
2260         else
2261                 res = SSL_connect(conn->ssl);
2262         if (res != 1) {
2263                 int err = SSL_get_error(conn->ssl, res);
2264                 if (err == SSL_ERROR_WANT_READ)
2265                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
2266                                    "more data");
2267                 else if (err == SSL_ERROR_WANT_WRITE)
2268                         wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
2269                                    "write");
2270                 else {
2271                         tls_show_errors(MSG_INFO, __func__, "SSL_connect");
2272                         conn->failed++;
2273                 }
2274         }
2275
2276         /* Get the TLS handshake data to be sent to the server */
2277         res = BIO_ctrl_pending(conn->ssl_out);
2278         wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
2279         out_data = wpabuf_alloc(res);
2280         if (out_data == NULL) {
2281                 wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
2282                            "handshake output (%d bytes)", res);
2283                 if (BIO_reset(conn->ssl_out) < 0) {
2284                         tls_show_errors(MSG_INFO, __func__,
2285                                         "BIO_reset failed");
2286                 }
2287                 return NULL;
2288         }
2289         res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data),
2290                                       res);
2291         if (res < 0) {
2292                 tls_show_errors(MSG_INFO, __func__,
2293                                 "Handshake failed - BIO_read");
2294                 if (BIO_reset(conn->ssl_out) < 0) {
2295                         tls_show_errors(MSG_INFO, __func__,
2296                                         "BIO_reset failed");
2297                 }
2298                 wpabuf_free(out_data);
2299                 return NULL;
2300         }
2301         wpabuf_put(out_data, res);
2302
2303         return out_data;
2304 }
2305
2306
2307 static struct wpabuf *
2308 openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
2309 {
2310         struct wpabuf *appl_data;
2311         int res;
2312
2313         appl_data = wpabuf_alloc(max_len + 100);
2314         if (appl_data == NULL)
2315                 return NULL;
2316
2317         res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
2318                        wpabuf_size(appl_data));
2319         if (res < 0) {
2320                 int err = SSL_get_error(conn->ssl, res);
2321                 if (err == SSL_ERROR_WANT_READ ||
2322                     err == SSL_ERROR_WANT_WRITE) {
2323                         wpa_printf(MSG_DEBUG, "SSL: No Application Data "
2324                                    "included");
2325                 } else {
2326                         tls_show_errors(MSG_INFO, __func__,
2327                                         "Failed to read possible "
2328                                         "Application Data");
2329                 }
2330                 wpabuf_free(appl_data);
2331                 return NULL;
2332         }
2333
2334         wpabuf_put(appl_data, res);
2335         wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
2336                             "message", appl_data);
2337
2338         return appl_data;
2339 }
2340
2341
2342 static struct wpabuf *
2343 openssl_connection_handshake(struct tls_connection *conn,
2344                              const struct wpabuf *in_data,
2345                              struct wpabuf **appl_data, int server)
2346 {
2347         struct wpabuf *out_data;
2348
2349         if (appl_data)
2350                 *appl_data = NULL;
2351
2352         out_data = openssl_handshake(conn, in_data, server);
2353         if (out_data == NULL)
2354                 return NULL;
2355
2356         if (SSL_is_init_finished(conn->ssl) && appl_data && in_data)
2357                 *appl_data = openssl_get_appl_data(conn, wpabuf_len(in_data));
2358
2359         return out_data;
2360 }
2361
2362
2363 struct wpabuf *
2364 tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
2365                          const struct wpabuf *in_data,
2366                          struct wpabuf **appl_data)
2367 {
2368         return openssl_connection_handshake(conn, in_data, appl_data, 0);
2369 }
2370
2371
2372 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
2373                                                 struct tls_connection *conn,
2374                                                 const struct wpabuf *in_data,
2375                                                 struct wpabuf **appl_data)
2376 {
2377         return openssl_connection_handshake(conn, in_data, appl_data, 1);
2378 }
2379
2380
2381 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
2382                                        struct tls_connection *conn,
2383                                        const struct wpabuf *in_data)
2384 {
2385         int res;
2386         struct wpabuf *buf;
2387
2388         if (conn == NULL)
2389                 return NULL;
2390
2391         /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
2392         if ((res = BIO_reset(conn->ssl_in)) < 0 ||
2393             (res = BIO_reset(conn->ssl_out)) < 0) {
2394                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2395                 return NULL;
2396         }
2397         res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
2398         if (res < 0) {
2399                 tls_show_errors(MSG_INFO, __func__,
2400                                 "Encryption failed - SSL_write");
2401                 return NULL;
2402         }
2403
2404         /* Read encrypted data to be sent to the server */
2405         buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
2406         if (buf == NULL)
2407                 return NULL;
2408         res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
2409         if (res < 0) {
2410                 tls_show_errors(MSG_INFO, __func__,
2411                                 "Encryption failed - BIO_read");
2412                 wpabuf_free(buf);
2413                 return NULL;
2414         }
2415         wpabuf_put(buf, res);
2416
2417         return buf;
2418 }
2419
2420
2421 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
2422                                        struct tls_connection *conn,
2423                                        const struct wpabuf *in_data)
2424 {
2425         int res;
2426         struct wpabuf *buf;
2427
2428         /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
2429         res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
2430                         wpabuf_len(in_data));
2431         if (res < 0) {
2432                 tls_show_errors(MSG_INFO, __func__,
2433                                 "Decryption failed - BIO_write");
2434                 return NULL;
2435         }
2436         if (BIO_reset(conn->ssl_out) < 0) {
2437                 tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
2438                 return NULL;
2439         }
2440
2441         /* Read decrypted data for further processing */
2442         /*
2443          * Even though we try to disable TLS compression, it is possible that
2444          * this cannot be done with all TLS libraries. Add extra buffer space
2445          * to handle the possibility of the decrypted data being longer than
2446          * input data.
2447          */
2448         buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
2449         if (buf == NULL)
2450                 return NULL;
2451         res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
2452         if (res < 0) {
2453                 tls_show_errors(MSG_INFO, __func__,
2454                                 "Decryption failed - SSL_read");
2455                 wpabuf_free(buf);
2456                 return NULL;
2457         }
2458         wpabuf_put(buf, res);
2459
2460         return buf;
2461 }
2462
2463
2464 int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
2465 {
2466         return conn ? conn->ssl->hit : 0;
2467 }
2468
2469
2470 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
2471                                    u8 *ciphers)
2472 {
2473         char buf[100], *pos, *end;
2474         u8 *c;
2475         int ret;
2476
2477         if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
2478                 return -1;
2479
2480         buf[0] = '\0';
2481         pos = buf;
2482         end = pos + sizeof(buf);
2483
2484         c = ciphers;
2485         while (*c != TLS_CIPHER_NONE) {
2486                 const char *suite;
2487
2488                 switch (*c) {
2489                 case TLS_CIPHER_RC4_SHA:
2490                         suite = "RC4-SHA";
2491                         break;
2492                 case TLS_CIPHER_AES128_SHA:
2493                         suite = "AES128-SHA";
2494                         break;
2495                 case TLS_CIPHER_RSA_DHE_AES128_SHA:
2496                         suite = "DHE-RSA-AES128-SHA";
2497                         break;
2498                 case TLS_CIPHER_ANON_DH_AES128_SHA:
2499                         suite = "ADH-AES128-SHA";
2500                         break;
2501                 default:
2502                         wpa_printf(MSG_DEBUG, "TLS: Unsupported "
2503                                    "cipher selection: %d", *c);
2504                         return -1;
2505                 }
2506                 ret = os_snprintf(pos, end - pos, ":%s", suite);
2507                 if (ret < 0 || ret >= end - pos)
2508                         break;
2509                 pos += ret;
2510
2511                 c++;
2512         }
2513
2514         wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);
2515
2516         if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
2517                 tls_show_errors(MSG_INFO, __func__,
2518                                 "Cipher suite configuration failed");
2519                 return -1;
2520         }
2521
2522         return 0;
2523 }
2524
2525
2526 int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
2527                    char *buf, size_t buflen)
2528 {
2529         const char *name;
2530         if (conn == NULL || conn->ssl == NULL)
2531                 return -1;
2532
2533         name = SSL_get_cipher(conn->ssl);
2534         if (name == NULL)
2535                 return -1;
2536
2537         os_strlcpy(buf, name, buflen);
2538         return 0;
2539 }
2540
2541
2542 int tls_connection_enable_workaround(void *ssl_ctx,
2543                                      struct tls_connection *conn)
2544 {
2545         SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
2546
2547         return 0;
2548 }
2549
2550
2551 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2552 /* ClientHello TLS extensions require a patch to openssl, so this function is
2553  * commented out unless explicitly needed for EAP-FAST in order to be able to
2554  * build this file with unmodified openssl. */
2555 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
2556                                     int ext_type, const u8 *data,
2557                                     size_t data_len)
2558 {
2559         if (conn == NULL || conn->ssl == NULL || ext_type != 35)
2560                 return -1;
2561
2562 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2563         if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
2564                                        data_len) != 1)
2565                 return -1;
2566 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2567         if (SSL_set_hello_extension(conn->ssl, ext_type, (void *) data,
2568                                     data_len) != 1)
2569                 return -1;
2570 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2571
2572         return 0;
2573 }
2574 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2575
2576
2577 int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
2578 {
2579         if (conn == NULL)
2580                 return -1;
2581         return conn->failed;
2582 }
2583
2584
2585 int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
2586 {
2587         if (conn == NULL)
2588                 return -1;
2589         return conn->read_alerts;
2590 }
2591
2592
2593 int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
2594 {
2595         if (conn == NULL)
2596                 return -1;
2597         return conn->write_alerts;
2598 }
2599
2600
2601 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
2602                               const struct tls_connection_params *params)
2603 {
2604         int ret;
2605         unsigned long err;
2606
2607         if (conn == NULL)
2608                 return -1;
2609
2610         while ((err = ERR_get_error())) {
2611                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2612                            __func__, ERR_error_string(err, NULL));
2613         }
2614
2615         if (params->engine) {
2616                 wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
2617                 ret = tls_engine_init(conn, params->engine_id, params->pin,
2618                                       params->key_id, params->cert_id,
2619                                       params->ca_cert_id);
2620                 if (ret)
2621                         return ret;
2622         }
2623         if (tls_connection_set_subject_match(conn,
2624                                              params->subject_match,
2625                                              params->altsubject_match))
2626                 return -1;
2627
2628         if (params->engine && params->ca_cert_id) {
2629                 if (tls_connection_engine_ca_cert(tls_ctx, conn,
2630                                                   params->ca_cert_id))
2631                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2632         } else if (tls_connection_ca_cert(tls_ctx, conn, params->ca_cert,
2633                                           params->ca_cert_blob,
2634                                           params->ca_cert_blob_len,
2635                                           params->ca_path))
2636                 return -1;
2637
2638         if (params->engine && params->cert_id) {
2639                 if (tls_connection_engine_client_cert(conn, params->cert_id))
2640                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2641         } else if (tls_connection_client_cert(conn, params->client_cert,
2642                                               params->client_cert_blob,
2643                                               params->client_cert_blob_len))
2644                 return -1;
2645
2646         if (params->engine && params->key_id) {
2647                 wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
2648                 if (tls_connection_engine_private_key(conn))
2649                         return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
2650         } else if (tls_connection_private_key(tls_ctx, conn,
2651                                               params->private_key,
2652                                               params->private_key_passwd,
2653                                               params->private_key_blob,
2654                                               params->private_key_blob_len)) {
2655                 wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
2656                            params->private_key);
2657                 return -1;
2658         }
2659
2660         if (tls_connection_dh(conn, params->dh_file)) {
2661                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2662                            params->dh_file);
2663                 return -1;
2664         }
2665
2666         tls_get_errors(tls_ctx);
2667
2668         return 0;
2669 }
2670
2671
2672 int tls_global_set_params(void *tls_ctx,
2673                           const struct tls_connection_params *params)
2674 {
2675         SSL_CTX *ssl_ctx = tls_ctx;
2676         unsigned long err;
2677
2678         while ((err = ERR_get_error())) {
2679                 wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
2680                            __func__, ERR_error_string(err, NULL));
2681         }
2682
2683         if (tls_global_ca_cert(ssl_ctx, params->ca_cert))
2684                 return -1;
2685
2686         if (tls_global_client_cert(ssl_ctx, params->client_cert))
2687                 return -1;
2688
2689         if (tls_global_private_key(ssl_ctx, params->private_key,
2690                                    params->private_key_passwd))
2691                 return -1;
2692
2693         if (tls_global_dh(ssl_ctx, params->dh_file)) {
2694                 wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
2695                            params->dh_file);
2696                 return -1;
2697         }
2698
2699         return 0;
2700 }
2701
2702
2703 int tls_connection_get_keyblock_size(void *tls_ctx,
2704                                      struct tls_connection *conn)
2705 {
2706         const EVP_CIPHER *c;
2707         const EVP_MD *h;
2708
2709         if (conn == NULL || conn->ssl == NULL ||
2710             conn->ssl->enc_read_ctx == NULL ||
2711             conn->ssl->enc_read_ctx->cipher == NULL ||
2712             conn->ssl->read_hash == NULL)
2713                 return -1;
2714
2715         c = conn->ssl->enc_read_ctx->cipher;
2716 #if OPENSSL_VERSION_NUMBER >= 0x00909000L
2717         h = EVP_MD_CTX_md(conn->ssl->read_hash);
2718 #else
2719         h = conn->ssl->read_hash;
2720 #endif
2721
2722         return 2 * (EVP_CIPHER_key_length(c) +
2723                     EVP_MD_size(h) +
2724                     EVP_CIPHER_iv_length(c));
2725 }
2726
2727
2728 unsigned int tls_capabilities(void *tls_ctx)
2729 {
2730         return 0;
2731 }
2732
2733
2734 int tls_connection_set_ia(void *tls_ctx, struct tls_connection *conn,
2735                           int tls_ia)
2736 {
2737         return -1;
2738 }
2739
2740
2741 struct wpabuf * tls_connection_ia_send_phase_finished(
2742         void *tls_ctx, struct tls_connection *conn, int final)
2743 {
2744         return NULL;
2745 }
2746
2747
2748 int tls_connection_ia_final_phase_finished(void *tls_ctx,
2749                                            struct tls_connection *conn)
2750 {
2751         return -1;
2752 }
2753
2754
2755 int tls_connection_ia_permute_inner_secret(void *tls_ctx,
2756                                            struct tls_connection *conn,
2757                                            const u8 *key, size_t key_len)
2758 {
2759         return -1;
2760 }
2761
2762
2763 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2764 /* Pre-shared secred requires a patch to openssl, so this function is
2765  * commented out unless explicitly needed for EAP-FAST in order to be able to
2766  * build this file with unmodified openssl. */
2767
2768 static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
2769                            STACK_OF(SSL_CIPHER) *peer_ciphers,
2770                            SSL_CIPHER **cipher, void *arg)
2771 {
2772         struct tls_connection *conn = arg;
2773         int ret;
2774
2775         if (conn == NULL || conn->session_ticket_cb == NULL)
2776                 return 0;
2777
2778         ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
2779                                       conn->session_ticket,
2780                                       conn->session_ticket_len,
2781                                       s->s3->client_random,
2782                                       s->s3->server_random, secret);
2783         os_free(conn->session_ticket);
2784         conn->session_ticket = NULL;
2785
2786         if (ret <= 0)
2787                 return 0;
2788
2789         *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
2790         return 1;
2791 }
2792
2793
2794 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2795 static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
2796                                      int len, void *arg)
2797 {
2798         struct tls_connection *conn = arg;
2799
2800         if (conn == NULL || conn->session_ticket_cb == NULL)
2801                 return 0;
2802
2803         wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);
2804
2805         os_free(conn->session_ticket);
2806         conn->session_ticket = NULL;
2807
2808         wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2809                     "extension", data, len);
2810
2811         conn->session_ticket = os_malloc(len);
2812         if (conn->session_ticket == NULL)
2813                 return 0;
2814
2815         os_memcpy(conn->session_ticket, data, len);
2816         conn->session_ticket_len = len;
2817
2818         return 1;
2819 }
2820 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2821 #ifdef SSL_OP_NO_TICKET
2822 static void tls_hello_ext_cb(SSL *s, int client_server, int type,
2823                              unsigned char *data, int len, void *arg)
2824 {
2825         struct tls_connection *conn = arg;
2826
2827         if (conn == NULL || conn->session_ticket_cb == NULL)
2828                 return;
2829
2830         wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2831                    type, len);
2832
2833         if (type == TLSEXT_TYPE_session_ticket && !client_server) {
2834                 os_free(conn->session_ticket);
2835                 conn->session_ticket = NULL;
2836
2837                 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2838                             "extension", data, len);
2839                 conn->session_ticket = os_malloc(len);
2840                 if (conn->session_ticket == NULL)
2841                         return;
2842
2843                 os_memcpy(conn->session_ticket, data, len);
2844                 conn->session_ticket_len = len;
2845         }
2846 }
2847 #else /* SSL_OP_NO_TICKET */
2848 static int tls_hello_ext_cb(SSL *s, TLS_EXTENSION *ext, void *arg)
2849 {
2850         struct tls_connection *conn = arg;
2851
2852         if (conn == NULL || conn->session_ticket_cb == NULL)
2853                 return 0;
2854
2855         wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
2856                    ext->type, ext->length);
2857
2858         os_free(conn->session_ticket);
2859         conn->session_ticket = NULL;
2860
2861         if (ext->type == 35) {
2862                 wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
2863                             "extension", ext->data, ext->length);
2864                 conn->session_ticket = os_malloc(ext->length);
2865                 if (conn->session_ticket == NULL)
2866                         return SSL_AD_INTERNAL_ERROR;
2867
2868                 os_memcpy(conn->session_ticket, ext->data, ext->length);
2869                 conn->session_ticket_len = ext->length;
2870         }
2871
2872         return 0;
2873 }
2874 #endif /* SSL_OP_NO_TICKET */
2875 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2876 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2877
2878
2879 int tls_connection_set_session_ticket_cb(void *tls_ctx,
2880                                          struct tls_connection *conn,
2881                                          tls_session_ticket_cb cb,
2882                                          void *ctx)
2883 {
2884 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2885         conn->session_ticket_cb = cb;
2886         conn->session_ticket_cb_ctx = ctx;
2887
2888         if (cb) {
2889                 if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
2890                                               conn) != 1)
2891                         return -1;
2892 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2893                 SSL_set_session_ticket_ext_cb(conn->ssl,
2894                                               tls_session_ticket_ext_cb, conn);
2895 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2896 #ifdef SSL_OP_NO_TICKET
2897                 SSL_set_tlsext_debug_callback(conn->ssl, tls_hello_ext_cb);
2898                 SSL_set_tlsext_debug_arg(conn->ssl, conn);
2899 #else /* SSL_OP_NO_TICKET */
2900                 if (SSL_set_hello_extension_cb(conn->ssl, tls_hello_ext_cb,
2901                                                conn) != 1)
2902                         return -1;
2903 #endif /* SSL_OP_NO_TICKET */
2904 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2905         } else {
2906                 if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
2907                         return -1;
2908 #ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
2909                 SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
2910 #else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2911 #ifdef SSL_OP_NO_TICKET
2912                 SSL_set_tlsext_debug_callback(conn->ssl, NULL);
2913                 SSL_set_tlsext_debug_arg(conn->ssl, conn);
2914 #else /* SSL_OP_NO_TICKET */
2915                 if (SSL_set_hello_extension_cb(conn->ssl, NULL, NULL) != 1)
2916                         return -1;
2917 #endif /* SSL_OP_NO_TICKET */
2918 #endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
2919         }
2920
2921         return 0;
2922 #else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2923         return -1;
2924 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2925 }