src/crypto/tls_wolfssl.c

   1 /*
   2  * SSL/TLS interface functions for wolfSSL TLS case
   3  * Copyright (c) 2004-2017, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "crypto.h"
  13 #include "crypto/sha1.h"
  14 #include "crypto/sha256.h"
  15 #include "tls.h"
  16
  17 /* wolfSSL includes */
  18 #include <wolfssl/options.h>
  19 #include <wolfssl/ssl.h>
  20 #include <wolfssl/error-ssl.h>
  21 #include <wolfssl/wolfcrypt/asn.h>
  22
  23 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
  24 #define HAVE_AESGCM
  25 #include <wolfssl/wolfcrypt/aes.h>
  26 #endif
  27
  28 #if !defined(CONFIG_FIPS) &&                             \
  29     (defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) ||   \
  30      defined(EAP_SERVER_FAST))
  31 #define WOLFSSL_NEED_EAP_FAST_PRF
  32 #endif
  33
  34 #define SECRET_LEN          48
  35 #define RAN_LEN             32
  36 #define SESSION_TICKET_LEN  256
  37
  38 static int tls_ref_count = 0;
  39
  40 static int tls_ex_idx_session = 0;
  41
  42
  43 /* tls input data for wolfSSL Read Callback */
  44 struct tls_in_data {
  45         const struct wpabuf *in_data;
  46         size_t consumed; /* how many bytes have we used already */
  47 };
  48
  49 /* tls output data for wolfSSL Write Callback */
  50 struct tls_out_data {
  51         struct wpabuf *out_data;
  52 };
  53
  54 struct tls_context {
  55         void (*event_cb)(void *ctx, enum tls_event ev,
  56                          union tls_event_data *data);
  57         void *cb_ctx;
  58         int cert_in_cb;
  59         char *ocsp_stapling_response;
  60 };
  61
  62 static struct tls_context *tls_global = NULL;
  63
  64 /* wolfssl tls_connection */
  65 struct tls_connection {
  66         struct tls_context *context;
  67         WOLFSSL *ssl;
  68         int read_alerts;
  69         int write_alerts;
  70         int failed;
  71         struct tls_in_data input;
  72         struct tls_out_data output;
  73         char *subject_match;
  74         char *alt_subject_match;
  75         char *suffix_match;
  76         char *domain_match;
  77
  78         u8 srv_cert_hash[32];
  79
  80         unsigned char client_random[RAN_LEN];
  81         unsigned char server_random[RAN_LEN];
  82         unsigned int flags;
  83 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
  84         tls_session_ticket_cb session_ticket_cb;
  85         void *session_ticket_cb_ctx;
  86         byte session_ticket[SESSION_TICKET_LEN];
  87 #endif
  88         unsigned int ca_cert_verify:1;
  89         unsigned int cert_probe:1;
  90         unsigned int server_cert_only:1;
  91         unsigned int success_data:1;
  92
  93         WOLFSSL_X509 *peer_cert;
  94         WOLFSSL_X509 *peer_issuer;
  95         WOLFSSL_X509 *peer_issuer_issuer;
  96 };
  97
  98
  99 static struct tls_context * tls_context_new(const struct tls_config *conf)
 100 {
 101         struct tls_context *context = os_zalloc(sizeof(*context));
 102
 103         if (!context)
 104                 return NULL;
 105
 106         if (conf) {
 107                 context->event_cb = conf->event_cb;
 108                 context->cb_ctx = conf->cb_ctx;
 109                 context->cert_in_cb = conf->cert_in_cb;
 110         }
 111
 112         return context;
 113 }
 114
 115
 116 static void wolfssl_reset_in_data(struct tls_in_data *in,
 117                                   const struct wpabuf *buf)
 118 {
 119         /* old one not owned by us so don't free */
 120         in->in_data = buf;
 121         in->consumed = 0;
 122 }
 123
 124
 125 static void wolfssl_reset_out_data(struct tls_out_data *out)
 126 {
 127         /* old one not owned by us so don't free */
 128         out->out_data = wpabuf_alloc_copy("", 0);
 129 }
 130
 131
 132 /* wolfSSL I/O Receive CallBack */
 133 static int wolfssl_receive_cb(WOLFSSL *ssl, char *buf, int sz, void *ctx)
 134 {
 135         size_t get = sz;
 136         struct tls_in_data *data = ctx;
 137
 138         if (!data)
 139                 return -1;
 140
 141         if (get > (wpabuf_len(data->in_data) - data->consumed))
 142                 get = wpabuf_len(data->in_data) - data->consumed;
 143
 144         os_memcpy(buf, wpabuf_head(data->in_data) + data->consumed, get);
 145         data->consumed += get;
 146
 147         if (get == 0)
 148                 return -2; /* WANT_READ */
 149
 150         return (int) get;
 151 }
 152
 153
 154 /* wolfSSL I/O Send CallBack */
 155 static int wolfssl_send_cb(WOLFSSL *ssl, char *buf, int sz, void *ctx)
 156 {
 157         struct wpabuf *tmp;
 158         struct tls_out_data *data = ctx;
 159
 160         if (!data)
 161                 return -1;
 162
 163         wpa_printf(MSG_DEBUG, "SSL: adding %d bytes", sz);
 164
 165         tmp = wpabuf_alloc_copy(buf, sz);
 166         if (!tmp)
 167                 return -1;
 168         data->out_data = wpabuf_concat(data->out_data, tmp);
 169         if (!data->out_data)
 170                 return -1;
 171
 172         return sz;
 173 }
 174
 175
 176 static void remove_session_cb(WOLFSSL_CTX *ctx, WOLFSSL_SESSION *sess)
 177 {
 178         struct wpabuf *buf;
 179
 180         buf = wolfSSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
 181         if (!buf)
 182                 return;
 183         wpa_printf(MSG_DEBUG,
 184                    "wolfSSL: Free application session data %p (sess %p)",
 185                    buf, sess);
 186         wpabuf_free(buf);
 187
 188         wolfSSL_SESSION_set_ex_data(sess, tls_ex_idx_session, NULL);
 189 }
 190
 191
 192 void * tls_init(const struct tls_config *conf)
 193 {
 194         WOLFSSL_CTX *ssl_ctx;
 195         struct tls_context *context;
 196         const char *ciphers;
 197
 198 #ifdef DEBUG_WOLFSSL
 199         wolfSSL_Debugging_ON();
 200 #endif /* DEBUG_WOLFSSL */
 201
 202         context = tls_context_new(conf);
 203         if (!context)
 204                 return NULL;
 205
 206         if (tls_ref_count == 0) {
 207                 tls_global = context;
 208
 209                 if (wolfSSL_Init() < 0)
 210                         return NULL;
 211                 /* wolfSSL_Debugging_ON(); */
 212         }
 213
 214         tls_ref_count++;
 215
 216         /* start as client */
 217         ssl_ctx = wolfSSL_CTX_new(wolfSSLv23_client_method());
 218         if (!ssl_ctx) {
 219                 tls_ref_count--;
 220                 if (context != tls_global)
 221                         os_free(context);
 222                 if (tls_ref_count == 0) {
 223                         os_free(tls_global);
 224                         tls_global = NULL;
 225                 }
 226         }
 227         wolfSSL_SetIORecv(ssl_ctx, wolfssl_receive_cb);
 228         wolfSSL_SetIOSend(ssl_ctx, wolfssl_send_cb);
 229         wolfSSL_CTX_set_ex_data(ssl_ctx, 0, context);
 230
 231         if (conf->tls_session_lifetime > 0) {
 232                 wolfSSL_CTX_set_quiet_shutdown(ssl_ctx, 1);
 233                 wolfSSL_CTX_set_session_cache_mode(ssl_ctx,
 234                                                    SSL_SESS_CACHE_SERVER);
 235                 wolfSSL_CTX_set_timeout(ssl_ctx, conf->tls_session_lifetime);
 236                 wolfSSL_CTX_sess_set_remove_cb(ssl_ctx, remove_session_cb);
 237         } else {
 238                 wolfSSL_CTX_set_session_cache_mode(ssl_ctx,
 239                                                    SSL_SESS_CACHE_CLIENT);
 240         }
 241
 242         if (conf && conf->openssl_ciphers)
 243                 ciphers = conf->openssl_ciphers;
 244         else
 245                 ciphers = "ALL";
 246         if (wolfSSL_CTX_set_cipher_list(ssl_ctx, ciphers) != 1) {
 247                 wpa_printf(MSG_ERROR,
 248                            "wolfSSL: Failed to set cipher string '%s'",
 249                            ciphers);
 250                 tls_deinit(ssl_ctx);
 251                 return NULL;
 252         }
 253
 254         return ssl_ctx;
 255 }
 256
 257
 258 void tls_deinit(void *ssl_ctx)
 259 {
 260         struct tls_context *context = wolfSSL_CTX_get_ex_data(ssl_ctx, 0);
 261
 262         if (context != tls_global)
 263                 os_free(context);
 264
 265         wolfSSL_CTX_free((WOLFSSL_CTX *) ssl_ctx);
 266
 267         tls_ref_count--;
 268         if (tls_ref_count == 0) {
 269                 wolfSSL_Cleanup();
 270                 os_free(tls_global);
 271                 tls_global = NULL;
 272         }
 273 }
 274
 275
 276 int tls_get_errors(void *tls_ctx)
 277 {
 278 #ifdef DEBUG_WOLFSSL
 279 #if 0
 280         unsigned long err;
 281
 282         err = wolfSSL_ERR_peek_last_error_line(NULL, NULL);
 283         if (err != 0) {
 284                 wpa_printf(MSG_INFO, "TLS - SSL error: %s",
 285                            wolfSSL_ERR_error_string(err, NULL));
 286                 return 1;
 287         }
 288 #endif
 289 #endif /* DEBUG_WOLFSSL */
 290         return 0;
 291 }
 292
 293
 294 struct tls_connection * tls_connection_init(void *tls_ctx)
 295 {
 296         WOLFSSL_CTX *ssl_ctx = tls_ctx;
 297         struct tls_connection *conn;
 298
 299         wpa_printf(MSG_DEBUG, "SSL: connection init");
 300
 301         conn = os_zalloc(sizeof(*conn));
 302         if (!conn)
 303                 return NULL;
 304         conn->ssl = wolfSSL_new(ssl_ctx);
 305         if (!conn->ssl) {
 306                 os_free(conn);
 307                 return NULL;
 308         }
 309
 310         wolfSSL_SetIOReadCtx(conn->ssl,  &conn->input);
 311         wolfSSL_SetIOWriteCtx(conn->ssl, &conn->output);
 312         wolfSSL_set_ex_data(conn->ssl, 0, conn);
 313         conn->context = wolfSSL_CTX_get_ex_data(ssl_ctx, 0);
 314
 315         /* Need randoms post-hanshake for EAP-FAST, export key and deriving
 316          * session ID in EAP methods. */
 317         wolfSSL_KeepArrays(conn->ssl);
 318         wolfSSL_KeepHandshakeResources(conn->ssl);
 319         wolfSSL_UseClientSuites(conn->ssl);
 320
 321         return conn;
 322 }
 323
 324
 325 void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn)
 326 {
 327         if (!conn)
 328                 return;
 329
 330         wpa_printf(MSG_DEBUG, "SSL: connection deinit");
 331
 332         /* parts */
 333         wolfSSL_free(conn->ssl);
 334         os_free(conn->subject_match);
 335         os_free(conn->alt_subject_match);
 336         os_free(conn->suffix_match);
 337         os_free(conn->domain_match);
 338
 339         /* self */
 340         os_free(conn);
 341 }
 342
 343
 344 int tls_connection_established(void *tls_ctx, struct tls_connection *conn)
 345 {
 346         return conn ? wolfSSL_is_init_finished(conn->ssl) : 0;
 347 }
 348
 349
 350 char * tls_connection_peer_serial_num(void *tls_ctx,
 351                                       struct tls_connection *conn)
 352 {
 353         /* TODO */
 354         return NULL;
 355 }
 356
 357
 358 int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn)
 359 {
 360         WOLFSSL_SESSION *session;
 361
 362         if (!conn)
 363                 return -1;
 364
 365         wpa_printf(MSG_DEBUG, "SSL: connection shutdown");
 366
 367         /* Set quiet as OpenSSL does */
 368         wolfSSL_set_quiet_shutdown(conn->ssl, 1);
 369         wolfSSL_shutdown(conn->ssl);
 370
 371         session = wolfSSL_get_session(conn->ssl);
 372         if (wolfSSL_clear(conn->ssl) != 1)
 373                 return -1;
 374         wolfSSL_set_session(conn->ssl, session);
 375
 376         return 0;
 377 }
 378
 379
 380 static int tls_connection_set_subject_match(struct tls_connection *conn,
 381                                             const char *subject_match,
 382                                             const char *alt_subject_match,
 383                                             const char *suffix_match,
 384                                             const char *domain_match)
 385 {
 386         os_free(conn->subject_match);
 387         conn->subject_match = NULL;
 388         if (subject_match) {
 389                 conn->subject_match = os_strdup(subject_match);
 390                 if (!conn->subject_match)
 391                         return -1;
 392         }
 393
 394         os_free(conn->alt_subject_match);
 395         conn->alt_subject_match = NULL;
 396         if (alt_subject_match) {
 397                 conn->alt_subject_match = os_strdup(alt_subject_match);
 398                 if (!conn->alt_subject_match)
 399                         return -1;
 400         }
 401
 402         os_free(conn->suffix_match);
 403         conn->suffix_match = NULL;
 404         if (suffix_match) {
 405                 conn->suffix_match = os_strdup(suffix_match);
 406                 if (!conn->suffix_match)
 407                         return -1;
 408         }
 409
 410         os_free(conn->domain_match);
 411         conn->domain_match = NULL;
 412         if (domain_match) {
 413                 conn->domain_match = os_strdup(domain_match);
 414                 if (!conn->domain_match)
 415                         return -1;
 416         }
 417
 418         return 0;
 419 }
 420
 421
 422 static int tls_connection_dh(struct tls_connection *conn, const char *dh_file,
 423                              const u8 *dh_blob, size_t blob_len)
 424 {
 425         if (!dh_file && !dh_blob)
 426                 return 0;
 427
 428         wolfSSL_set_accept_state(conn->ssl);
 429
 430         if (dh_blob) {
 431                 if (wolfSSL_SetTmpDH_buffer(conn->ssl, dh_blob, blob_len,
 432                                             SSL_FILETYPE_ASN1) < 0) {
 433                         wpa_printf(MSG_INFO, "SSL: use DH DER blob failed");
 434                         return -1;
 435                 }
 436                 wpa_printf(MSG_DEBUG, "SSL: use DH blob OK");
 437                 return 0;
 438         }
 439
 440         if (dh_file) {
 441                 wpa_printf(MSG_INFO, "SSL: use DH PEM file: %s", dh_file);
 442                 if (wolfSSL_SetTmpDH_file(conn->ssl, dh_file,
 443                                           SSL_FILETYPE_PEM) < 0) {
 444                         wpa_printf(MSG_INFO, "SSL: use DH PEM file failed");
 445                         if (wolfSSL_SetTmpDH_file(conn->ssl, dh_file,
 446                                                   SSL_FILETYPE_ASN1) < 0) {
 447                                 wpa_printf(MSG_INFO,
 448                                            "SSL: use DH DER file failed");
 449                                 return -1;
 450                         }
 451                 }
 452                 wpa_printf(MSG_DEBUG, "SSL: use DH file OK");
 453                 return 0;
 454         }
 455
 456         return 0;
 457 }
 458
 459
 460 static int tls_connection_client_cert(struct tls_connection *conn,
 461                                       const char *client_cert,
 462                                       const u8 *client_cert_blob,
 463                                       size_t blob_len)
 464 {
 465         if (!client_cert && !client_cert_blob)
 466                 return 0;
 467
 468         if (client_cert_blob) {
 469                 if (wolfSSL_use_certificate_chain_buffer_format(
 470                             conn->ssl, client_cert_blob, blob_len,
 471                             SSL_FILETYPE_ASN1) < 0) {
 472                         wpa_printf(MSG_INFO,
 473                                    "SSL: use client cert DER blob failed");
 474                         return -1;
 475                 }
 476                 wpa_printf(MSG_DEBUG, "SSL: use client cert blob OK");
 477                 return 0;
 478         }
 479
 480         if (client_cert) {
 481                 if (wolfSSL_use_certificate_chain_file(conn->ssl,
 482                                                        client_cert) < 0) {
 483                         wpa_printf(MSG_INFO,
 484                                    "SSL: use client cert PEM file failed");
 485                         if (wolfSSL_use_certificate_chain_file_format(
 486                                     conn->ssl, client_cert,
 487                                     SSL_FILETYPE_ASN1) < 0) {
 488                                 wpa_printf(MSG_INFO,
 489                                            "SSL: use client cert DER file failed");
 490                                 return -1;
 491                         }
 492                 }
 493                 wpa_printf(MSG_DEBUG, "SSL: use client cert file OK");
 494                 return 0;
 495         }
 496
 497         return 0;
 498 }
 499
 500
 501 static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
 502 {
 503         if (!password)
 504                 return 0;
 505         os_strlcpy(buf, (char *) password, size);
 506         return os_strlen(buf);
 507 }
 508
 509
 510 static int tls_connection_private_key(void *tls_ctx,
 511                                       struct tls_connection *conn,
 512                                       const char *private_key,
 513                                       const char *private_key_passwd,
 514                                       const u8 *private_key_blob,
 515                                       size_t blob_len)
 516 {
 517         WOLFSSL_CTX *ctx = tls_ctx;
 518         char *passwd = NULL;
 519         int ok = 0;
 520
 521         if (!private_key && !private_key_blob)
 522                 return 0;
 523
 524         if (private_key_passwd) {
 525                 passwd = os_strdup(private_key_passwd);
 526                 if (!passwd)
 527                         return -1;
 528         }
 529
 530         wolfSSL_CTX_set_default_passwd_cb(ctx, tls_passwd_cb);
 531         wolfSSL_CTX_set_default_passwd_cb_userdata(ctx, passwd);
 532
 533         if (private_key_blob) {
 534                 if (wolfSSL_use_PrivateKey_buffer(conn->ssl,
 535                                                   private_key_blob, blob_len,
 536                                                   SSL_FILETYPE_ASN1) < 0) {
 537                         wpa_printf(MSG_INFO,
 538                                    "SSL: use private DER blob failed");
 539                 } else {
 540                         wpa_printf(MSG_DEBUG, "SSL: use private key blob OK");
 541                         ok = 1;
 542                 }
 543         }
 544
 545         if (!ok && private_key) {
 546                 if (wolfSSL_use_PrivateKey_file(conn->ssl, private_key,
 547                                                 SSL_FILETYPE_PEM) < 0) {
 548                         wpa_printf(MSG_INFO,
 549                                    "SSL: use private key PEM file failed");
 550                         if (wolfSSL_use_PrivateKey_file(conn->ssl, private_key,
 551                                                         SSL_FILETYPE_ASN1) < 0)
 552                         {
 553                                 wpa_printf(MSG_INFO,
 554                                            "SSL: use private key DER file failed");
 555                         } else {
 556                                 ok = 1;
 557                         }
 558                 } else {
 559                         ok = 1;
 560                 }
 561
 562                 if (ok)
 563                         wpa_printf(MSG_DEBUG, "SSL: use private key file OK");
 564         }
 565
 566         wolfSSL_CTX_set_default_passwd_cb(ctx, NULL);
 567         os_free(passwd);
 568
 569         if (!ok)
 570                 return -1;
 571
 572         return 0;
 573 }
 574
 575
 576 static int tls_match_alt_subject_component(WOLFSSL_X509 *cert, int type,
 577                                            const char *value, size_t len)
 578 {
 579         WOLFSSL_ASN1_OBJECT *gen;
 580         void *ext;
 581         int found = 0;
 582         int i;
 583
 584         ext = wolfSSL_X509_get_ext_d2i(cert, ALT_NAMES_OID, NULL, NULL);
 585
 586         for (i = 0; ext && i < wolfSSL_sk_num(ext); i++) {
 587                 gen = wolfSSL_sk_value(ext, i);
 588                 if (gen->type != type)
 589                         continue;
 590                 if (os_strlen((char *) gen->obj) == len &&
 591                     os_memcmp(value, gen->obj, len) == 0)
 592                         found++;
 593         }
 594
 595         wolfSSL_sk_ASN1_OBJECT_free(ext);
 596
 597         return found;
 598 }
 599
 600
 601 static int tls_match_alt_subject(WOLFSSL_X509 *cert, const char *match)
 602 {
 603         int type;
 604         const char *pos, *end;
 605         size_t len;
 606
 607         pos = match;
 608         do {
 609                 if (os_strncmp(pos, "EMAIL:", 6) == 0) {
 610                         type = GEN_EMAIL;
 611                         pos += 6;
 612                 } else if (os_strncmp(pos, "DNS:", 4) == 0) {
 613                         type = GEN_DNS;
 614                         pos += 4;
 615                 } else if (os_strncmp(pos, "URI:", 4) == 0) {
 616                         type = GEN_URI;
 617                         pos += 4;
 618                 } else {
 619                         wpa_printf(MSG_INFO,
 620                                    "TLS: Invalid altSubjectName match '%s'",
 621                                    pos);
 622                         return 0;
 623                 }
 624                 end = os_strchr(pos, ';');
 625                 while (end) {
 626                         if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
 627                             os_strncmp(end + 1, "DNS:", 4) == 0 ||
 628                             os_strncmp(end + 1, "URI:", 4) == 0)
 629                                 break;
 630                         end = os_strchr(end + 1, ';');
 631                 }
 632                 if (end)
 633                         len = end - pos;
 634                 else
 635                         len = os_strlen(pos);
 636                 if (tls_match_alt_subject_component(cert, type, pos, len) > 0)
 637                         return 1;
 638                 pos = end + 1;
 639         } while (end);
 640
 641         return 0;
 642 }
 643
 644
 645 static int domain_suffix_match(const char *val, size_t len, const char *match,
 646                                int full)
 647 {
 648         size_t i, match_len;
 649
 650         /* Check for embedded nuls that could mess up suffix matching */
 651         for (i = 0; i < len; i++) {
 652                 if (val[i] == '\0') {
 653                         wpa_printf(MSG_DEBUG,
 654                                    "TLS: Embedded null in a string - reject");
 655                         return 0;
 656                 }
 657         }
 658
 659         match_len = os_strlen(match);
 660         if (match_len > len || (full && match_len != len))
 661                 return 0;
 662
 663         if (os_strncasecmp(val + len - match_len, match, match_len) != 0)
 664                 return 0; /* no match */
 665
 666         if (match_len == len)
 667                 return 1; /* exact match */
 668
 669         if (val[len - match_len - 1] == '.')
 670                 return 1; /* full label match completes suffix match */
 671
 672         wpa_printf(MSG_DEBUG, "TLS: Reject due to incomplete label match");
 673         return 0;
 674 }
 675
 676
 677 static int tls_match_suffix(WOLFSSL_X509 *cert, const char *match, int full)
 678 {
 679         WOLFSSL_ASN1_OBJECT *gen;
 680         void *ext;
 681         int i;
 682         int j;
 683         int dns_name = 0;
 684         WOLFSSL_X509_NAME *name;
 685
 686         wpa_printf(MSG_DEBUG, "TLS: Match domain against %s%s",
 687                    full ? "" : "suffix ", match);
 688
 689         ext = wolfSSL_X509_get_ext_d2i(cert, ALT_NAMES_OID, NULL, NULL);
 690
 691         for (j = 0; ext && j < wolfSSL_sk_num(ext); j++) {
 692                 gen = wolfSSL_sk_value(ext, j);
 693                 if (gen->type != ALT_NAMES_OID)
 694                         continue;
 695                 dns_name++;
 696                 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate dNSName",
 697                                   gen->obj, os_strlen((char *)gen->obj));
 698                 if (domain_suffix_match((const char *) gen->obj,
 699                                         os_strlen((char *) gen->obj), match,
 700                                         full) == 1) {
 701                         wpa_printf(MSG_DEBUG, "TLS: %s in dNSName found",
 702                                    full ? "Match" : "Suffix match");
 703                         wolfSSL_sk_ASN1_OBJECT_free(ext);
 704                         return 1;
 705                 }
 706         }
 707         wolfSSL_sk_ASN1_OBJECT_free(ext);
 708
 709         if (dns_name) {
 710                 wpa_printf(MSG_DEBUG, "TLS: None of the dNSName(s) matched");
 711                 return 0;
 712         }
 713
 714         name = wolfSSL_X509_get_subject_name(cert);
 715         i = -1;
 716         for (;;) {
 717                 WOLFSSL_X509_NAME_ENTRY *e;
 718                 WOLFSSL_ASN1_STRING *cn;
 719
 720                 i = wolfSSL_X509_NAME_get_index_by_NID(name, ASN_COMMON_NAME,
 721                                                        i);
 722                 if (i == -1)
 723                         break;
 724                 e = wolfSSL_X509_NAME_get_entry(name, i);
 725                 if (!e)
 726                         continue;
 727                 cn = wolfSSL_X509_NAME_ENTRY_get_data(e);
 728                 if (!cn)
 729                         continue;
 730                 wpa_hexdump_ascii(MSG_DEBUG, "TLS: Certificate commonName",
 731                                   cn->data, cn->length);
 732                 if (domain_suffix_match(cn->data, cn->length, match, full) == 1)
 733                 {
 734                         wpa_printf(MSG_DEBUG, "TLS: %s in commonName found",
 735                                    full ? "Match" : "Suffix match");
 736                         return 1;
 737                 }
 738         }
 739
 740         wpa_printf(MSG_DEBUG, "TLS: No CommonName %smatch found",
 741                    full ? "" : "suffix ");
 742         return 0;
 743 }
 744
 745
 746 static enum tls_fail_reason wolfssl_tls_fail_reason(int err)
 747 {
 748         switch (err) {
 749         case X509_V_ERR_CERT_REVOKED:
 750                 return TLS_FAIL_REVOKED;
 751         case ASN_BEFORE_DATE_E:
 752         case X509_V_ERR_CERT_NOT_YET_VALID:
 753         case X509_V_ERR_CRL_NOT_YET_VALID:
 754                 return TLS_FAIL_NOT_YET_VALID;
 755         case ASN_AFTER_DATE_E:
 756         case X509_V_ERR_CERT_HAS_EXPIRED:
 757         case X509_V_ERR_CRL_HAS_EXPIRED:
 758                 return TLS_FAIL_EXPIRED;
 759         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 760         case X509_V_ERR_UNABLE_TO_GET_CRL:
 761         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
 762         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 763         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 764         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 765         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 766         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
 767         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
 768         case X509_V_ERR_INVALID_CA:
 769                 return TLS_FAIL_UNTRUSTED;
 770         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 771         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
 772         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 773         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 774         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 775         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
 776         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
 777         case X509_V_ERR_CERT_UNTRUSTED:
 778         case X509_V_ERR_CERT_REJECTED:
 779                 return TLS_FAIL_BAD_CERTIFICATE;
 780         default:
 781                 return TLS_FAIL_UNSPECIFIED;
 782         }
 783 }
 784
 785
 786 static const char * wolfssl_tls_err_string(int err, const char *err_str)
 787 {
 788         switch (err) {
 789         case ASN_BEFORE_DATE_E:
 790                 return "certificate is not yet valid";
 791         case ASN_AFTER_DATE_E:
 792                 return "certificate has expired";
 793         default:
 794                 return err_str;
 795         }
 796 }
 797
 798
 799 static struct wpabuf * get_x509_cert(WOLFSSL_X509 *cert)
 800 {
 801         struct wpabuf *buf = NULL;
 802         const u8 *data;
 803         int cert_len;
 804
 805         data = wolfSSL_X509_get_der(cert, &cert_len);
 806         if (!data)
 807                 buf = wpabuf_alloc_copy(data, cert_len);
 808
 809         return buf;
 810 }
 811
 812
 813 static void wolfssl_tls_fail_event(struct tls_connection *conn,
 814                                    WOLFSSL_X509 *err_cert, int err, int depth,
 815                                    const char *subject, const char *err_str,
 816                                    enum tls_fail_reason reason)
 817 {
 818         union tls_event_data ev;
 819         struct wpabuf *cert = NULL;
 820         struct tls_context *context = conn->context;
 821
 822         if (!context->event_cb)
 823                 return;
 824
 825         cert = get_x509_cert(err_cert);
 826         os_memset(&ev, 0, sizeof(ev));
 827         ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
 828                 reason : wolfssl_tls_fail_reason(err);
 829         ev.cert_fail.depth = depth;
 830         ev.cert_fail.subject = subject;
 831         ev.cert_fail.reason_txt = wolfssl_tls_err_string(err, err_str);
 832         ev.cert_fail.cert = cert;
 833         context->event_cb(context->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
 834         wpabuf_free(cert);
 835 }
 836
 837
 838 static void wolfssl_tls_cert_event(struct tls_connection *conn,
 839                                    WOLFSSL_X509 *err_cert, int depth,
 840                                    const char *subject)
 841 {
 842         struct wpabuf *cert = NULL;
 843         union tls_event_data ev;
 844         struct tls_context *context = conn->context;
 845         char *alt_subject[TLS_MAX_ALT_SUBJECT];
 846         int alt, num_alt_subject = 0;
 847         WOLFSSL_ASN1_OBJECT *gen;
 848         void *ext;
 849         int i;
 850 #ifdef CONFIG_SHA256
 851         u8 hash[32];
 852 #endif /* CONFIG_SHA256 */
 853
 854         if (!context->event_cb)
 855                 return;
 856
 857         os_memset(&ev, 0, sizeof(ev));
 858         if (conn->cert_probe || (conn->flags & TLS_CONN_EXT_CERT_CHECK) ||
 859             context->cert_in_cb) {
 860                 cert = get_x509_cert(err_cert);
 861                 ev.peer_cert.cert = cert;
 862         }
 863
 864 #ifdef CONFIG_SHA256
 865         if (cert) {
 866                 const u8 *addr[1];
 867                 size_t len[1];
 868
 869                 addr[0] = wpabuf_head(cert);
 870                 len[0] = wpabuf_len(cert);
 871                 if (sha256_vector(1, addr, len, hash) == 0) {
 872                         ev.peer_cert.hash = hash;
 873                         ev.peer_cert.hash_len = sizeof(hash);
 874                 }
 875         }
 876 #endif /* CONFIG_SHA256 */
 877
 878         ev.peer_cert.depth = depth;
 879         ev.peer_cert.subject = subject;
 880
 881         ext = wolfSSL_X509_get_ext_d2i(err_cert, ALT_NAMES_OID, NULL, NULL);
 882         for (i = 0; ext && i < wolfSSL_sk_num(ext); i++) {
 883                 char *pos;
 884
 885                 if (num_alt_subject == TLS_MAX_ALT_SUBJECT)
 886                         break;
 887                 gen = wolfSSL_sk_value((void *) ext, i);
 888                 if (gen->type != GEN_EMAIL &&
 889                     gen->type != GEN_DNS &&
 890                     gen->type != GEN_URI)
 891                         continue;
 892
 893                 pos = os_malloc(10 + os_strlen((char *) gen->obj) + 1);
 894                 if (!pos)
 895                         break;
 896                 alt_subject[num_alt_subject++] = pos;
 897
 898                 switch (gen->type) {
 899                 case GEN_EMAIL:
 900                         os_memcpy(pos, "EMAIL:", 6);
 901                         pos += 6;
 902                         break;
 903                 case GEN_DNS:
 904                         os_memcpy(pos, "DNS:", 4);
 905                         pos += 4;
 906                         break;
 907                 case GEN_URI:
 908                         os_memcpy(pos, "URI:", 4);
 909                         pos += 4;
 910                         break;
 911                 }
 912
 913                 os_memcpy(pos, gen->obj, os_strlen((char *)gen->obj));
 914                 pos += os_strlen((char *)gen->obj);
 915                 *pos = '\0';
 916         }
 917         wolfSSL_sk_ASN1_OBJECT_free(ext);
 918
 919         for (alt = 0; alt < num_alt_subject; alt++)
 920                 ev.peer_cert.altsubject[alt] = alt_subject[alt];
 921         ev.peer_cert.num_altsubject = num_alt_subject;
 922
 923         context->event_cb(context->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
 924         wpabuf_free(cert);
 925         for (alt = 0; alt < num_alt_subject; alt++)
 926                 os_free(alt_subject[alt]);
 927 }
 928
 929
 930 static int tls_verify_cb(int preverify_ok, WOLFSSL_X509_STORE_CTX *x509_ctx)
 931 {
 932         char buf[256];
 933         WOLFSSL_X509 *err_cert;
 934         int err, depth;
 935         WOLFSSL *ssl;
 936         struct tls_connection *conn;
 937         struct tls_context *context;
 938         char *match, *altmatch, *suffix_match, *domain_match;
 939         const char *err_str;
 940
 941         err_cert = wolfSSL_X509_STORE_CTX_get_current_cert(x509_ctx);
 942         if (!err_cert) {
 943                 wpa_printf(MSG_DEBUG, "wolfSSL: No Cert");
 944                 return 0;
 945         }
 946
 947         err = wolfSSL_X509_STORE_CTX_get_error(x509_ctx);
 948         depth = wolfSSL_X509_STORE_CTX_get_error_depth(x509_ctx);
 949         ssl = wolfSSL_X509_STORE_CTX_get_ex_data(
 950                 x509_ctx, wolfSSL_get_ex_data_X509_STORE_CTX_idx());
 951         wolfSSL_X509_NAME_oneline(wolfSSL_X509_get_subject_name(err_cert), buf,
 952                                   sizeof(buf));
 953
 954         conn = wolfSSL_get_ex_data(ssl, 0);
 955         if (!conn) {
 956                 wpa_printf(MSG_DEBUG, "wolfSSL: No ex_data");
 957                 return 0;
 958         }
 959
 960         if (depth == 0)
 961                 conn->peer_cert = err_cert;
 962         else if (depth == 1)
 963                 conn->peer_issuer = err_cert;
 964         else if (depth == 2)
 965                 conn->peer_issuer_issuer = err_cert;
 966
 967         context = conn->context;
 968         match = conn->subject_match;
 969         altmatch = conn->alt_subject_match;
 970         suffix_match = conn->suffix_match;
 971         domain_match = conn->domain_match;
 972
 973         if (!preverify_ok && !conn->ca_cert_verify)
 974                 preverify_ok = 1;
 975         if (!preverify_ok && depth > 0 && conn->server_cert_only)
 976                 preverify_ok = 1;
 977         if (!preverify_ok && (conn->flags & TLS_CONN_DISABLE_TIME_CHECKS) &&
 978             (err == X509_V_ERR_CERT_HAS_EXPIRED ||
 979              err == ASN_AFTER_DATE_E || err == ASN_BEFORE_DATE_E ||
 980              err == X509_V_ERR_CERT_NOT_YET_VALID)) {
 981                 wpa_printf(MSG_DEBUG,
 982                            "wolfSSL: Ignore certificate validity time mismatch");
 983                 preverify_ok = 1;
 984         }
 985
 986         err_str = wolfSSL_X509_verify_cert_error_string(err);
 987
 988 #ifdef CONFIG_SHA256
 989         /*
 990          * Do not require preverify_ok so we can explicity allow otherwise
 991          * invalid pinned server certificates.
 992          */
 993         if (depth == 0 && conn->server_cert_only) {
 994                 struct wpabuf *cert;
 995
 996                 cert = get_x509_cert(err_cert);
 997                 if (!cert) {
 998                         wpa_printf(MSG_DEBUG,
 999                                    "wolfSSL: Could not fetch server certificate data");
1000                         preverify_ok = 0;
1001                 } else {
1002                         u8 hash[32];
1003                         const u8 *addr[1];
1004                         size_t len[1];
1005
1006                         addr[0] = wpabuf_head(cert);
1007                         len[0] = wpabuf_len(cert);
1008                         if (sha256_vector(1, addr, len, hash) < 0 ||
1009                             os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
1010                                 err_str = "Server certificate mismatch";
1011                                 err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
1012                                 preverify_ok = 0;
1013                         } else if (!preverify_ok) {
1014                                 /*
1015                                  * Certificate matches pinned certificate, allow
1016                                  * regardless of other problems.
1017                                  */
1018                                 wpa_printf(MSG_DEBUG,
1019                                            "wolfSSL: Ignore validation issues for a pinned server certificate");
1020                                 preverify_ok = 1;
1021                         }
1022                         wpabuf_free(cert);
1023                 }
1024         }
1025 #endif /* CONFIG_SHA256 */
1026
1027         if (!preverify_ok) {
1028                 wpa_printf(MSG_WARNING,
1029                            "TLS: Certificate verification failed, error %d (%s) depth %d for '%s'",
1030                            err, err_str, depth, buf);
1031                 wolfssl_tls_fail_event(conn, err_cert, err, depth, buf,
1032                                        err_str, TLS_FAIL_UNSPECIFIED);
1033                 return preverify_ok;
1034         }
1035
1036         wpa_printf(MSG_DEBUG,
1037                    "TLS: %s - preverify_ok=%d err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
1038                    __func__, preverify_ok, err, err_str,
1039                    conn->ca_cert_verify, depth, buf);
1040         if (depth == 0 && match && os_strstr(buf, match) == NULL) {
1041                 wpa_printf(MSG_WARNING,
1042                            "TLS: Subject '%s' did not match with '%s'",
1043                            buf, match);
1044                 preverify_ok = 0;
1045                 wolfssl_tls_fail_event(conn, err_cert, err, depth, buf,
1046                                        "Subject mismatch",
1047                                        TLS_FAIL_SUBJECT_MISMATCH);
1048         } else if (depth == 0 && altmatch &&
1049                    !tls_match_alt_subject(err_cert, altmatch)) {
1050                 wpa_printf(MSG_WARNING,
1051                            "TLS: altSubjectName match '%s' not found",
1052                            altmatch);
1053                 preverify_ok = 0;
1054                 wolfssl_tls_fail_event(conn, err_cert, err, depth, buf,
1055                                        "AltSubject mismatch",
1056                                        TLS_FAIL_ALTSUBJECT_MISMATCH);
1057         } else if (depth == 0 && suffix_match &&
1058                    !tls_match_suffix(err_cert, suffix_match, 0)) {
1059                 wpa_printf(MSG_WARNING,
1060                            "TLS: Domain suffix match '%s' not found",
1061                            suffix_match);
1062                 preverify_ok = 0;
1063                 wolfssl_tls_fail_event(conn, err_cert, err, depth, buf,
1064                                        "Domain suffix mismatch",
1065                                        TLS_FAIL_DOMAIN_SUFFIX_MISMATCH);
1066         } else if (depth == 0 && domain_match &&
1067                    !tls_match_suffix(err_cert, domain_match, 1)) {
1068                 wpa_printf(MSG_WARNING, "TLS: Domain match '%s' not found",
1069                            domain_match);
1070                 preverify_ok = 0;
1071                 wolfssl_tls_fail_event(conn, err_cert, err, depth, buf,
1072                                        "Domain mismatch",
1073                                        TLS_FAIL_DOMAIN_MISMATCH);
1074         } else {
1075                 wolfssl_tls_cert_event(conn, err_cert, depth, buf);
1076         }
1077
1078         if (conn->cert_probe && preverify_ok && depth == 0) {
1079                 wpa_printf(MSG_DEBUG,
1080                            "wolfSSL: Reject server certificate on probe-only run");
1081                 preverify_ok = 0;
1082                 wolfssl_tls_fail_event(conn, err_cert, err, depth, buf,
1083                                        "Server certificate chain probe",
1084                                        TLS_FAIL_SERVER_CHAIN_PROBE);
1085         }
1086
1087 #ifdef HAVE_OCSP_WOLFSSL
1088         if (depth == 0 && (conn->flags & TLS_CONN_REQUEST_OCSP) &&
1089             preverify_ok) {
1090                 enum ocsp_result res;
1091
1092                 res = check_ocsp_resp(conn->ssl_ctx, conn->ssl, err_cert,
1093                                       conn->peer_issuer,
1094                                       conn->peer_issuer_issuer);
1095                 if (res == OCSP_REVOKED) {
1096                         preverify_ok = 0;
1097                         wolfssl_tls_fail_event(conn, err_cert, err, depth, buf,
1098                                                "certificate revoked",
1099                                                TLS_FAIL_REVOKED);
1100                         if (err == X509_V_OK)
1101                                 X509_STORE_CTX_set_error(
1102                                         x509_ctx, X509_V_ERR_CERT_REVOKED);
1103                 } else if (res != OCSP_GOOD &&
1104                            (conn->flags & TLS_CONN_REQUIRE_OCSP)) {
1105                         preverify_ok = 0;
1106                         wolfssl_tls_fail_event(conn, err_cert, err, depth, buf,
1107                                                "bad certificate status response",
1108                                                TLS_FAIL_UNSPECIFIED);
1109                 }
1110         }
1111 #endif /* HAVE_OCSP_WOLFSSL */
1112         if (depth == 0 && preverify_ok && context->event_cb != NULL)
1113                 context->event_cb(context->cb_ctx,
1114                                   TLS_CERT_CHAIN_SUCCESS, NULL);
1115
1116         return preverify_ok;
1117 }
1118
1119
1120 static int tls_connection_ca_cert(void *tls_ctx, struct tls_connection *conn,
1121                                   const char *ca_cert,
1122                                   const u8 *ca_cert_blob, size_t blob_len,
1123                                   const char *ca_path)
1124 {
1125         WOLFSSL_CTX *ctx = tls_ctx;
1126
1127         wolfSSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
1128         conn->ca_cert_verify = 1;
1129
1130         if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
1131                 wpa_printf(MSG_DEBUG,
1132                            "wolfSSL: Probe for server certificate chain");
1133                 conn->cert_probe = 1;
1134                 conn->ca_cert_verify = 0;
1135                 return 0;
1136         }
1137
1138         if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
1139 #ifdef CONFIG_SHA256
1140                 const char *pos = ca_cert + 7;
1141
1142                 if (os_strncmp(pos, "server/sha256/", 14) != 0) {
1143                         wpa_printf(MSG_DEBUG,
1144                                    "wolfSSL: Unsupported ca_cert hash value '%s'",
1145                                    ca_cert);
1146                         return -1;
1147                 }
1148                 pos += 14;
1149                 if (os_strlen(pos) != 32 * 2) {
1150                         wpa_printf(MSG_DEBUG,
1151                                    "wolfSSL: Unexpected SHA256 hash length in ca_cert '%s'",
1152                                    ca_cert);
1153                         return -1;
1154                 }
1155                 if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
1156                         wpa_printf(MSG_DEBUG,
1157                                    "wolfSSL: Invalid SHA256 hash value in ca_cert '%s'",
1158                                    ca_cert);
1159                         return -1;
1160                 }
1161                 conn->server_cert_only = 1;
1162                 wpa_printf(MSG_DEBUG,
1163                            "wolfSSL: Checking only server certificate match");
1164                 return 0;
1165 #else /* CONFIG_SHA256 */
1166                 wpa_printf(MSG_INFO,
1167                            "No SHA256 included in the build - cannot validate server certificate hash");
1168                 return -1;
1169 #endif /* CONFIG_SHA256 */
1170         }
1171
1172         if (ca_cert_blob) {
1173                 if (wolfSSL_CTX_load_verify_buffer(ctx, ca_cert_blob, blob_len,
1174                                                    SSL_FILETYPE_ASN1) !=
1175                     SSL_SUCCESS) {
1176                         wpa_printf(MSG_INFO, "SSL: failed to load CA blob");
1177                         return -1;
1178                 }
1179                 wpa_printf(MSG_DEBUG, "SSL: use CA cert blob OK");
1180                 return 0;
1181         }
1182
1183         if (ca_cert || ca_path) {
1184                 WOLFSSL_X509_STORE *cm = wolfSSL_X509_STORE_new();
1185
1186                 if (!cm) {
1187                         wpa_printf(MSG_INFO,
1188                                    "SSL: failed to create certificate store");
1189                         return -1;
1190                 }
1191                 wolfSSL_CTX_set_cert_store(ctx, cm);
1192
1193                 if (wolfSSL_CTX_load_verify_locations(ctx, ca_cert, ca_path) !=
1194                     SSL_SUCCESS) {
1195                         wpa_printf(MSG_INFO,
1196                                    "SSL: failed to load ca_cert as PEM");
1197
1198                         if (!ca_cert)
1199                                 return -1;
1200
1201                         if (wolfSSL_CTX_der_load_verify_locations(
1202                                     ctx, ca_cert, SSL_FILETYPE_ASN1) !=
1203                             SSL_SUCCESS) {
1204                                 wpa_printf(MSG_INFO,
1205                                            "SSL: failed to load ca_cert as DER");
1206                                 return -1;
1207                         }
1208                 }
1209                 return 0;
1210         }
1211
1212         conn->ca_cert_verify = 0;
1213         return 0;
1214 }
1215
1216
1217 static void tls_set_conn_flags(WOLFSSL *ssl, unsigned int flags)
1218 {
1219 #ifdef HAVE_SESSION_TICKET
1220 #if 0
1221         if (!(flags & TLS_CONN_DISABLE_SESSION_TICKET))
1222                 wolfSSL_UseSessionTicket(ssl);
1223 #endif
1224 #endif /* HAVE_SESSION_TICKET */
1225
1226         if (flags & TLS_CONN_DISABLE_TLSv1_0)
1227                 wolfSSL_set_options(ssl, SSL_OP_NO_TLSv1);
1228         if (flags & TLS_CONN_DISABLE_TLSv1_1)
1229                 wolfSSL_set_options(ssl, SSL_OP_NO_TLSv1_1);
1230         if (flags & TLS_CONN_DISABLE_TLSv1_2)
1231                 wolfSSL_set_options(ssl, SSL_OP_NO_TLSv1_2);
1232 }
1233
1234
1235 int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
1236                               const struct tls_connection_params *params)
1237 {
1238         wpa_printf(MSG_DEBUG, "SSL: set params");
1239
1240         if (tls_connection_set_subject_match(conn, params->subject_match,
1241                                              params->altsubject_match,
1242                                              params->suffix_match,
1243                                              params->domain_match) < 0) {
1244                 wpa_printf(MSG_INFO, "Error setting subject match");
1245                 return -1;
1246         }
1247
1248         if (tls_connection_ca_cert(tls_ctx, conn, params->ca_cert,
1249                                    params->ca_cert_blob,
1250                                    params->ca_cert_blob_len,
1251                                    params->ca_path) < 0) {
1252                 wpa_printf(MSG_INFO, "Error setting CA cert");
1253                 return -1;
1254         }
1255
1256         if (tls_connection_client_cert(conn, params->client_cert,
1257                                        params->client_cert_blob,
1258                                        params->client_cert_blob_len) < 0) {
1259                 wpa_printf(MSG_INFO, "Error setting client cert");
1260                 return -1;
1261         }
1262
1263         if (tls_connection_private_key(tls_ctx, conn, params->private_key,
1264                                        params->private_key_passwd,
1265                                        params->private_key_blob,
1266                                        params->private_key_blob_len) < 0) {
1267                 wpa_printf(MSG_INFO, "Error setting private key");
1268                 return -1;
1269         }
1270
1271         if (tls_connection_dh(conn, params->dh_file, params->dh_blob,
1272                               params->dh_blob_len) < 0) {
1273                 wpa_printf(MSG_INFO, "Error setting DH");
1274                 return -1;
1275         }
1276
1277         if (params->openssl_ciphers &&
1278             wolfSSL_set_cipher_list(conn->ssl, params->openssl_ciphers) != 1) {
1279                 wpa_printf(MSG_INFO,
1280                            "wolfSSL: Failed to set cipher string '%s'",
1281                            params->openssl_ciphers);
1282                 return -1;
1283         }
1284
1285         tls_set_conn_flags(conn->ssl, params->flags);
1286
1287 #ifdef HAVE_CERTIFICATE_STATUS_REQUEST
1288         if (params->flags & TLS_CONN_REQUEST_OCSP) {
1289                 if (wolfSSL_UseOCSPStapling(conn->ssl, WOLFSSL_CSR_OCSP,
1290                                             WOLFSSL_CSR_OCSP_USE_NONCE) !=
1291                     SSL_SUCCESS)
1292                         return -1;
1293                 wolfSSL_CTX_EnableOCSP(tls_ctx, 0);
1294         }
1295 #endif /* HAVE_CERTIFICATE_STATUS_REQUEST */
1296 #ifdef HAVE_CERTIFICATE_STATUS_REQUEST_V2
1297         if (params->flags & TLS_CONN_REQUEST_OCSP) {
1298                 if (wolfSSL_UseOCSPStaplingV2(conn->ssl,
1299                                               WOLFSSL_CSR2_OCSP_MULTI, 0) !=
1300                     SSL_SUCCESS)
1301                         return -1;
1302                 wolfSSL_CTX_EnableOCSP(tls_ctx, 0);
1303         }
1304 #endif /* HAVE_CERTIFICATE_STATUS_REQUEST_V2 */
1305 #if !defined(HAVE_CERTIFICATE_STATUS_REQUEST) && \
1306     !defined(HAVE_CERTIFICATE_STATUS_REQUEST_V2)
1307 #ifdef HAVE_OCSP
1308         if (params->flags & TLS_CONN_REQUEST_OCSP)
1309                 wolfSSL_CTX_EnableOCSP(ctx, 0);
1310 #else /* HAVE_OCSP */
1311         if (params->flags & TLS_CONN_REQUIRE_OCSP) {
1312                 wpa_printf(MSG_INFO,
1313                            "wolfSSL: No OCSP support included - reject configuration");
1314                 return -1;
1315         }
1316         if (params->flags & TLS_CONN_REQUEST_OCSP) {
1317                 wpa_printf(MSG_DEBUG,
1318                            "wolfSSL: No OCSP support included - allow optional OCSP case to continue");
1319         }
1320 #endif /* HAVE_OCSP */
1321 #endif /* !HAVE_CERTIFICATE_STATUS_REQUEST &&
1322         * !HAVE_CERTIFICATE_STATUS_REQUEST_V2 */
1323
1324         conn->flags = params->flags;
1325
1326         return 0;
1327 }
1328
1329
1330 static int tls_global_ca_cert(void *ssl_ctx, const char *ca_cert)
1331 {
1332         WOLFSSL_CTX *ctx = ssl_ctx;
1333
1334         if (ca_cert) {
1335                 if (wolfSSL_CTX_load_verify_locations(ctx, ca_cert, NULL) != 1)
1336                 {
1337                         wpa_printf(MSG_WARNING,
1338                                    "Failed to load root certificates");
1339                         return -1;
1340                 }
1341
1342                 wpa_printf(MSG_DEBUG,
1343                            "TLS: Trusted root certificate(s) loaded");
1344         }
1345
1346         return 0;
1347 }
1348
1349
1350 static int tls_global_client_cert(void *ssl_ctx, const char *client_cert)
1351 {
1352         WOLFSSL_CTX *ctx = ssl_ctx;
1353
1354         if (!client_cert)
1355                 return 0;
1356
1357         if (wolfSSL_CTX_use_certificate_chain_file_format(ctx, client_cert,
1358                                                           SSL_FILETYPE_ASN1) !=
1359             SSL_SUCCESS &&
1360             wolfSSL_CTX_use_certificate_chain_file(ctx, client_cert) !=
1361             SSL_SUCCESS) {
1362                 wpa_printf(MSG_INFO, "Failed to load client certificate");
1363                 return -1;
1364         }
1365
1366         wpa_printf(MSG_DEBUG, "SSL: Loaded global client certificate: %s",
1367                    client_cert);
1368
1369         return 0;
1370 }
1371
1372
1373 static int tls_global_private_key(void *ssl_ctx, const char *private_key,
1374                                   const char *private_key_passwd)
1375 {
1376         WOLFSSL_CTX *ctx = ssl_ctx;
1377         char *passwd = NULL;
1378         int ret = 0;
1379
1380         if (!private_key)
1381                 return 0;
1382
1383         if (private_key_passwd) {
1384                 passwd = os_strdup(private_key_passwd);
1385                 if (!passwd)
1386                         return -1;
1387         }
1388
1389         wolfSSL_CTX_set_default_passwd_cb(ctx, tls_passwd_cb);
1390         wolfSSL_CTX_set_default_passwd_cb_userdata(ctx, passwd);
1391
1392         if (wolfSSL_CTX_use_PrivateKey_file(ctx, private_key,
1393                                             SSL_FILETYPE_ASN1) != 1 &&
1394             wolfSSL_CTX_use_PrivateKey_file(ctx, private_key,
1395                                             SSL_FILETYPE_PEM) != 1) {
1396                 wpa_printf(MSG_INFO, "Failed to load private key");
1397                 ret = -1;
1398         }
1399
1400         wpa_printf(MSG_DEBUG, "SSL: Loaded global private key");
1401
1402         os_free(passwd);
1403         wolfSSL_CTX_set_default_passwd_cb(ctx, NULL);
1404
1405         return ret;
1406 }
1407
1408
1409 static int tls_global_dh(void *ssl_ctx, const char *dh_file,
1410                          const u8 *dh_blob, size_t blob_len)
1411 {
1412         WOLFSSL_CTX *ctx = ssl_ctx;
1413
1414         if (!dh_file && !dh_blob)
1415                 return 0;
1416
1417         if (dh_blob) {
1418                 if (wolfSSL_CTX_SetTmpDH_buffer(ctx, dh_blob, blob_len,
1419                                                 SSL_FILETYPE_ASN1) < 0) {
1420                         wpa_printf(MSG_INFO,
1421                                    "SSL: global use DH DER blob failed");
1422                         return -1;
1423                 }
1424                 wpa_printf(MSG_DEBUG, "SSL: global use DH blob OK");
1425                 return 0;
1426         }
1427
1428         if (dh_file) {
1429                 if (wolfSSL_CTX_SetTmpDH_file(ctx, dh_file, SSL_FILETYPE_PEM) <
1430                     0) {
1431                         wpa_printf(MSG_INFO,
1432                                    "SSL: global use DH PEM file failed");
1433                         if (wolfSSL_CTX_SetTmpDH_file(ctx, dh_file,
1434                                                       SSL_FILETYPE_ASN1) < 0) {
1435                                 wpa_printf(MSG_INFO,
1436                                            "SSL: global use DH DER file failed");
1437                                 return -1;
1438                         }
1439                 }
1440                 wpa_printf(MSG_DEBUG, "SSL: global use DH file OK");
1441                 return 0;
1442         }
1443
1444         return 0;
1445 }
1446
1447
1448 #ifdef HAVE_OCSP
1449
1450 int ocsp_status_cb(void *unused, const char *url, int url_sz,
1451                    unsigned char *request, int request_sz,
1452                    unsigned char **response)
1453 {
1454         size_t len;
1455
1456         (void) unused;
1457
1458         if (!url) {
1459                 wpa_printf(MSG_DEBUG,
1460                            "wolfSSL: OCSP status callback - no response configured");
1461                 *response = NULL;
1462                 return 0;
1463         }
1464
1465         *response = (unsigned char *) os_readfile(url, &len);
1466         if (!*response) {
1467                 wpa_printf(MSG_DEBUG,
1468                            "wolfSSL: OCSP status callback - could not read response file");
1469                 return -1;
1470         }
1471         wpa_printf(MSG_DEBUG,
1472                    "wolfSSL: OCSP status callback - send cached response");
1473         return len;
1474 }
1475
1476
1477 void ocsp_resp_free_cb(void *ocsp_stapling_response, unsigned char *response)
1478 {
1479         os_free(response);
1480 }
1481
1482 #endif /* HAVE_OCSP */
1483
1484
1485 int tls_global_set_params(void *tls_ctx,
1486                           const struct tls_connection_params *params)
1487 {
1488         wpa_printf(MSG_DEBUG, "SSL: global set params");
1489
1490         if (tls_global_ca_cert(tls_ctx, params->ca_cert) < 0) {
1491                 wpa_printf(MSG_INFO, "SSL: Failed to load ca cert file '%s'",
1492                            params->ca_cert);
1493                 return -1;
1494         }
1495
1496         if (tls_global_client_cert(tls_ctx, params->client_cert) < 0) {
1497                 wpa_printf(MSG_INFO,
1498                            "SSL: Failed to load client cert file '%s'",
1499                            params->client_cert);
1500                 return -1;
1501         }
1502
1503         if (tls_global_private_key(tls_ctx, params->private_key,
1504                                    params->private_key_passwd) < 0) {
1505                 wpa_printf(MSG_INFO,
1506                            "SSL: Failed to load private key file '%s'",
1507                            params->private_key);
1508                 return -1;
1509         }
1510
1511         if (tls_global_dh(tls_ctx, params->dh_file, params->dh_blob,
1512                           params->dh_blob_len) < 0) {
1513                 wpa_printf(MSG_INFO, "SSL: Failed to load DH file '%s'",
1514                            params->dh_file);
1515                 return -1;
1516         }
1517
1518         if (params->openssl_ciphers &&
1519             wolfSSL_CTX_set_cipher_list(tls_ctx,
1520                                         params->openssl_ciphers) != 1) {
1521                 wpa_printf(MSG_INFO,
1522                            "wolfSSL: Failed to set cipher string '%s'",
1523                            params->openssl_ciphers);
1524                 return -1;
1525         }
1526
1527 #ifdef HAVE_SESSION_TICKET
1528         /* Session ticket is off by default - can't disable once on. */
1529         if (!(params->flags & TLS_CONN_DISABLE_SESSION_TICKET))
1530                 wolfSSL_CTX_UseSessionTicket(tls_ctx);
1531 #endif /* HAVE_SESSION_TICKET */
1532
1533 #ifdef HAVE_OCSP
1534         if (params->ocsp_stapling_response) {
1535                 wolfSSL_CTX_SetOCSP_OverrideURL(tls_ctx,
1536                                                 params->ocsp_stapling_response);
1537                 wolfSSL_CTX_SetOCSP_Cb(tls_ctx, ocsp_status_cb,
1538                                        ocsp_resp_free_cb, NULL);
1539         }
1540 #endif /* HAVE_OCSP */
1541
1542         return 0;
1543 }
1544
1545
1546 int tls_global_set_verify(void *tls_ctx, int check_crl)
1547 {
1548         wpa_printf(MSG_DEBUG, "SSL: global set verify: %d", check_crl);
1549
1550         if (check_crl) {
1551                 /* Hack to Enable CRLs. */
1552                 wolfSSL_CTX_LoadCRLBuffer(tls_ctx, NULL, 0, SSL_FILETYPE_PEM);
1553         }
1554
1555         return 0;
1556 }
1557
1558
1559 int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
1560                               int verify_peer, unsigned int flags,
1561                               const u8 *session_ctx, size_t session_ctx_len)
1562 {
1563         if (!conn)
1564                 return -1;
1565
1566         wpa_printf(MSG_DEBUG, "SSL: set verify: %d", verify_peer);
1567
1568         if (verify_peer) {
1569                 conn->ca_cert_verify = 1;
1570                 wolfSSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
1571                                    SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
1572                                    tls_verify_cb);
1573         } else {
1574                 conn->ca_cert_verify = 0;
1575                 wolfSSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
1576         }
1577
1578         wolfSSL_set_accept_state(conn->ssl);
1579
1580         /* TODO: do we need to fake a session like OpenSSL does here? */
1581
1582         return 0;
1583 }
1584
1585
1586 static struct wpabuf * wolfssl_handshake(struct tls_connection *conn,
1587                                          const struct wpabuf *in_data,
1588                                          int server)
1589 {
1590         int res;
1591
1592         wolfssl_reset_out_data(&conn->output);
1593
1594         /* Initiate TLS handshake or continue the existing handshake */
1595         if (server) {
1596                 wolfSSL_set_accept_state(conn->ssl);
1597                 res = wolfSSL_accept(conn->ssl);
1598                 wpa_printf(MSG_DEBUG, "SSL: wolfSSL_accept: %d", res);
1599         } else {
1600                 wolfSSL_set_connect_state(conn->ssl);
1601                 res = wolfSSL_connect(conn->ssl);
1602                 wpa_printf(MSG_DEBUG, "SSL: wolfSSL_connect: %d", res);
1603         }
1604
1605         if (res != 1) {
1606                 int err = wolfSSL_get_error(conn->ssl, res);
1607
1608                 if (err == SSL_ERROR_WANT_READ) {
1609                         wpa_printf(MSG_DEBUG,
1610                                    "SSL: wolfSSL_connect - want more data");
1611                 } else if (err == SSL_ERROR_WANT_WRITE) {
1612                         wpa_printf(MSG_DEBUG,
1613                                    "SSL: wolfSSL_connect - want to write");
1614                 } else {
1615                         char msg[80];
1616
1617                         wpa_printf(MSG_DEBUG,
1618                                    "SSL: wolfSSL_connect - failed %s",
1619                                    wolfSSL_ERR_error_string(err, msg));
1620                         conn->failed++;
1621                 }
1622         }
1623
1624         return conn->output.out_data;
1625 }
1626
1627
1628 static struct wpabuf * wolfssl_get_appl_data(struct tls_connection *conn,
1629                                              size_t max_len)
1630 {
1631         int res;
1632         struct wpabuf *appl_data = wpabuf_alloc(max_len + 100);
1633
1634         if (!appl_data)
1635                 return NULL;
1636
1637         res = wolfSSL_read(conn->ssl, wpabuf_mhead(appl_data),
1638                            wpabuf_size(appl_data));
1639         if (res < 0) {
1640                 int err = wolfSSL_get_error(conn->ssl, res);
1641
1642                 if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
1643                         wpa_printf(MSG_DEBUG,
1644                                    "SSL: No Application Data included");
1645                 } else {
1646                         char msg[80];
1647
1648                         wpa_printf(MSG_DEBUG,
1649                                    "Failed to read possible Application Data %s",
1650                                    wolfSSL_ERR_error_string(err, msg));
1651                 }
1652
1653                 wpabuf_free(appl_data);
1654                 return NULL;
1655         }
1656
1657         wpabuf_put(appl_data, res);
1658         wpa_hexdump_buf_key(MSG_MSGDUMP,
1659                             "SSL: Application Data in Finished message",
1660                             appl_data);
1661         return appl_data;
1662 }
1663
1664
1665 static struct wpabuf *
1666 wolfssl_connection_handshake(struct tls_connection *conn,
1667                              const struct wpabuf *in_data,
1668                              struct wpabuf **appl_data, int server)
1669 {
1670         struct wpabuf *out_data;
1671
1672         wolfssl_reset_in_data(&conn->input, in_data);
1673
1674         if (appl_data)
1675                 *appl_data = NULL;
1676
1677         out_data = wolfssl_handshake(conn, in_data, server);
1678         if (!out_data)
1679                 return NULL;
1680
1681         if (wolfSSL_is_init_finished(conn->ssl)) {
1682                 wpa_printf(MSG_DEBUG,
1683                            "wolfSSL: Handshake finished - resumed=%d",
1684                            tls_connection_resumed(NULL, conn));
1685                 if (appl_data && in_data)
1686                         *appl_data = wolfssl_get_appl_data(conn,
1687                                                            wpabuf_len(in_data));
1688         }
1689
1690         return out_data;
1691 }
1692
1693
1694 struct wpabuf * tls_connection_handshake(void *tls_ctx,
1695                                          struct tls_connection *conn,
1696                                          const struct wpabuf *in_data,
1697                                          struct wpabuf **appl_data)
1698 {
1699         return wolfssl_connection_handshake(conn, in_data, appl_data, 0);
1700 }
1701
1702
1703 struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
1704                                                 struct tls_connection *conn,
1705                                                 const struct wpabuf *in_data,
1706                                                 struct wpabuf **appl_data)
1707 {
1708         return wolfssl_connection_handshake(conn, in_data, appl_data, 1);
1709 }
1710
1711
1712 struct wpabuf * tls_connection_encrypt(void *tls_ctx,
1713                                        struct tls_connection *conn,
1714                                        const struct wpabuf *in_data)
1715 {
1716         int res;
1717
1718         if (!conn)
1719                 return NULL;
1720
1721         wpa_printf(MSG_DEBUG, "SSL: encrypt: %ld bytes", wpabuf_len(in_data));
1722
1723         wolfssl_reset_out_data(&conn->output);
1724
1725         res = wolfSSL_write(conn->ssl, wpabuf_head(in_data),
1726                             wpabuf_len(in_data));
1727         if (res < 0) {
1728                 int  err = wolfSSL_get_error(conn->ssl, res);
1729                 char msg[80];
1730
1731                 wpa_printf(MSG_INFO, "Encryption failed - SSL_write: %s",
1732                            wolfSSL_ERR_error_string(err, msg));
1733                 return NULL;
1734         }
1735
1736         return conn->output.out_data;
1737 }
1738
1739
1740 struct wpabuf * tls_connection_decrypt(void *tls_ctx,
1741                                        struct tls_connection *conn,
1742                                        const struct wpabuf *in_data)
1743 {
1744         int res;
1745         struct wpabuf *buf;
1746
1747         if (!conn)
1748                 return NULL;
1749
1750         wpa_printf(MSG_DEBUG, "SSL: decrypt");
1751
1752         wolfssl_reset_in_data(&conn->input, in_data);
1753
1754         /* Read decrypted data for further processing */
1755         /*
1756          * Even though we try to disable TLS compression, it is possible that
1757          * this cannot be done with all TLS libraries. Add extra buffer space
1758          * to handle the possibility of the decrypted data being longer than
1759          * input data.
1760          */
1761         buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
1762         if (!buf)
1763                 return NULL;
1764         res = wolfSSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
1765         if (res < 0) {
1766                 wpa_printf(MSG_INFO, "Decryption failed - SSL_read");
1767                 wpabuf_free(buf);
1768                 return NULL;
1769         }
1770         wpabuf_put(buf, res);
1771
1772         wpa_printf(MSG_DEBUG, "SSL: decrypt: %ld bytes", wpabuf_len(buf));
1773
1774         return buf;
1775 }
1776
1777
1778 int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn)
1779 {
1780         return conn ? wolfSSL_session_reused(conn->ssl) : 0;
1781 }
1782
1783
1784 int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
1785                                    u8 *ciphers)
1786 {
1787         char buf[128], *pos, *end;
1788         u8 *c;
1789         int ret;
1790
1791         if (!conn || !conn->ssl || !ciphers)
1792                 return -1;
1793
1794         buf[0] = '\0';
1795         pos = buf;
1796         end = pos + sizeof(buf);
1797
1798         c = ciphers;
1799         while (*c != TLS_CIPHER_NONE) {
1800                 const char *suite;
1801
1802                 switch (*c) {
1803                 case TLS_CIPHER_RC4_SHA:
1804                         suite = "RC4-SHA";
1805                         break;
1806                 case TLS_CIPHER_AES128_SHA:
1807                         suite = "AES128-SHA";
1808                         break;
1809                 case TLS_CIPHER_RSA_DHE_AES128_SHA:
1810                         suite = "DHE-RSA-AES128-SHA";
1811                         break;
1812                 case TLS_CIPHER_ANON_DH_AES128_SHA:
1813                         suite = "ADH-AES128-SHA";
1814                         break;
1815                 case TLS_CIPHER_RSA_DHE_AES256_SHA:
1816                         suite = "DHE-RSA-AES256-SHA";
1817                         break;
1818                 case TLS_CIPHER_AES256_SHA:
1819                         suite = "AES256-SHA";
1820                         break;
1821                 default:
1822                         wpa_printf(MSG_DEBUG,
1823                                    "TLS: Unsupported cipher selection: %d", *c);
1824                         return -1;
1825                 }
1826                 ret = os_snprintf(pos, end - pos, ":%s", suite);
1827                 if (os_snprintf_error(end - pos, ret))
1828                         break;
1829                 pos += ret;
1830
1831                 c++;
1832         }
1833
1834         wpa_printf(MSG_DEBUG, "wolfSSL: cipher suites: %s", buf + 1);
1835
1836         if (wolfSSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
1837                 wpa_printf(MSG_DEBUG, "Cipher suite configuration failed");
1838                 return -1;
1839         }
1840
1841         return 0;
1842 }
1843
1844
1845 int tls_get_cipher(void *tls_ctx, struct tls_connection *conn,
1846                    char *buf, size_t buflen)
1847 {
1848         WOLFSSL_CIPHER *cipher;
1849         const char *name;
1850
1851         if (!conn || !conn->ssl)
1852                 return -1;
1853
1854         cipher = wolfSSL_get_current_cipher(conn->ssl);
1855         if (!cipher)
1856                 return -1;
1857
1858         name = wolfSSL_CIPHER_get_name(cipher);
1859         if (!name)
1860                 return -1;
1861
1862         if (os_strcmp(name, "SSL_RSA_WITH_RC4_128_SHA") == 0)
1863                 os_strlcpy(buf, "RC4-SHA", buflen);
1864         else if (os_strcmp(name, "TLS_RSA_WITH_AES_128_CBC_SHA") == 0)
1865                 os_strlcpy(buf, "AES128-SHA", buflen);
1866         else if (os_strcmp(name, "TLS_DHE_RSA_WITH_AES_128_CBC_SHA") == 0)
1867                 os_strlcpy(buf, "DHE-RSA-AES128-SHA", buflen);
1868         else if (os_strcmp(name, "TLS_DH_anon_WITH_AES_128_CBC_SHA") == 0)
1869                 os_strlcpy(buf, "ADH-AES128-SHA", buflen);
1870         else if (os_strcmp(name, "TLS_DHE_RSA_WITH_AES_256_CBC_SHA") == 0)
1871                 os_strlcpy(buf, "DHE-RSA-AES256-SHA", buflen);
1872         else if (os_strcmp(name, "TLS_RSA_WITH_AES_256_CBC_SHA") == 0)
1873                 os_strlcpy(buf, "AES256-SHA", buflen);
1874         else
1875                 os_strlcpy(buf, name, buflen);
1876
1877         return 0;
1878 }
1879
1880
1881 int tls_connection_enable_workaround(void *tls_ctx,
1882                                      struct tls_connection *conn)
1883 {
1884         /* no empty fragments in wolfSSL for now */
1885         return 0;
1886 }
1887
1888
1889 int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn)
1890 {
1891         if (!conn)
1892                 return -1;
1893
1894         return conn->failed;
1895 }
1896
1897
1898 int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn)
1899 {
1900         if (!conn)
1901                 return -1;
1902
1903         /* TODO: this is not incremented anywhere */
1904         return conn->read_alerts;
1905 }
1906
1907
1908 int tls_connection_get_write_alerts(void *tls_ctx,
1909                                     struct tls_connection *conn)
1910 {
1911         if (!conn)
1912                 return -1;
1913
1914         /* TODO: this is not incremented anywhere */
1915         return conn->write_alerts;
1916 }
1917
1918
1919
1920 int tls_get_library_version(char *buf, size_t buf_len)
1921 {
1922         return os_snprintf(buf, buf_len, "wolfSSL build=%s run=%s",
1923                            WOLFSSL_VERSION, wolfSSL_lib_version());
1924 }
1925
1926 int tls_get_version(void *ssl_ctx, struct tls_connection *conn,
1927                     char *buf, size_t buflen)
1928 {
1929         const char *name;
1930
1931         if (!conn || !conn->ssl)
1932                 return -1;
1933
1934         name = wolfSSL_get_version(conn->ssl);
1935         if (!name)
1936                 return -1;
1937
1938         os_strlcpy(buf, name, buflen);
1939         return 0;
1940 }
1941
1942
1943 int tls_connection_get_random(void *ssl_ctx, struct tls_connection *conn,
1944                               struct tls_random *keys)
1945 {
1946         WOLFSSL *ssl;
1947
1948         if (!conn || !keys)
1949                 return -1;
1950         ssl = conn->ssl;
1951         if (!ssl)
1952                 return -1;
1953
1954         os_memset(keys, 0, sizeof(*keys));
1955         keys->client_random = conn->client_random;
1956         keys->client_random_len = wolfSSL_get_client_random(
1957                 ssl, conn->client_random, sizeof(conn->client_random));
1958         keys->server_random = conn->server_random;
1959         keys->server_random_len = wolfSSL_get_server_random(
1960                 ssl, conn->server_random, sizeof(conn->server_random));
1961
1962         return 0;
1963 }
1964
1965
1966 int tls_connection_export_key(void *tls_ctx, struct tls_connection *conn,
1967                               const char *label, u8 *out, size_t out_len)
1968 {
1969         if (!conn || wolfSSL_make_eap_keys(conn->ssl, out, out_len, label) != 0)
1970                 return -1;
1971         return 0;
1972 }
1973
1974
1975 #define SEED_LEN        (RAN_LEN + RAN_LEN)
1976
1977 int tls_connection_get_eap_fast_key(void *tls_ctx, struct tls_connection *conn,
1978                                     u8 *out, size_t out_len)
1979 {
1980         byte seed[SEED_LEN];
1981         int ret = -1;
1982         WOLFSSL *ssl;
1983         byte *tmp_out;
1984         byte *_out;
1985         int skip = 0;
1986         byte *master_key;
1987         unsigned int master_key_len;
1988         byte *server_random;
1989         unsigned int server_len;
1990         byte *client_random;
1991         unsigned int client_len;
1992
1993         if (!conn || !conn->ssl)
1994                 return -1;
1995         ssl = conn->ssl;
1996
1997         skip = 2 * (wolfSSL_GetKeySize(ssl) + wolfSSL_GetHmacSize(ssl) +
1998                     wolfSSL_GetIVSize(ssl));
1999
2000         tmp_out = os_malloc(skip + out_len);
2001         if (!tmp_out)
2002                 return -1;
2003         _out = tmp_out;
2004
2005         wolfSSL_get_keys(ssl, &master_key, &master_key_len, &server_random,
2006                          &server_len, &client_random, &client_len);
2007         os_memcpy(seed, server_random, RAN_LEN);
2008         os_memcpy(seed + RAN_LEN, client_random, RAN_LEN);
2009
2010         if (wolfSSL_GetVersion(ssl) == WOLFSSL_TLSV1_2) {
2011                 tls_prf_sha256(master_key, master_key_len,
2012                                "key expansion", seed, sizeof(seed),
2013                                _out, skip + out_len);
2014                 ret = 0;
2015         } else {
2016                 ret = tls_prf_sha1_md5(master_key, master_key_len,
2017                                        "key expansion", seed, sizeof(seed),
2018                                        _out, skip + out_len);
2019         }
2020
2021         os_memset(master_key, 0, master_key_len);
2022         if (ret == 0)
2023                 os_memcpy(out, _out + skip, out_len);
2024         bin_clear_free(tmp_out, skip + out_len);
2025
2026         return ret;
2027 }
2028
2029
2030 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2031
2032 int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
2033                                     int ext_type, const u8 *data,
2034                                     size_t data_len)
2035 {
2036         (void) ssl_ctx;
2037
2038         if (!conn || !conn->ssl || ext_type != 35)
2039                 return -1;
2040
2041         if (wolfSSL_set_SessionTicket(conn->ssl, data,
2042                                       (unsigned int) data_len) != 1)
2043                 return -1;
2044
2045         return 0;
2046 }
2047
2048
2049 static int tls_sess_sec_cb(WOLFSSL *s, void *secret, int *secret_len, void *arg)
2050 {
2051         struct tls_connection *conn = arg;
2052         int ret;
2053         unsigned char client_random[RAN_LEN];
2054         unsigned char server_random[RAN_LEN];
2055         word32 ticket_len = sizeof(conn->session_ticket);
2056
2057         if (!conn || !conn->session_ticket_cb)
2058                 return 1;
2059
2060         if (wolfSSL_get_client_random(s, client_random,
2061                                       sizeof(client_random)) == 0 ||
2062             wolfSSL_get_server_random(s, server_random,
2063                                       sizeof(server_random)) == 0 ||
2064             wolfSSL_get_SessionTicket(s, conn->session_ticket,
2065                                       &ticket_len) != 1)
2066                 return 1;
2067
2068         if (ticket_len == 0)
2069                 return 0;
2070
2071         ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
2072                                       conn->session_ticket, ticket_len,
2073                                       client_random, server_random, secret);
2074         if (ret <= 0)
2075                 return 1;
2076
2077         *secret_len = SECRET_LEN;
2078         return 0;
2079 }
2080
2081 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2082
2083
2084 int tls_connection_set_session_ticket_cb(void *tls_ctx,
2085                                          struct tls_connection *conn,
2086                                          tls_session_ticket_cb cb,
2087                                          void *ctx)
2088 {
2089 #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
2090         conn->session_ticket_cb = cb;
2091         conn->session_ticket_cb_ctx = ctx;
2092
2093         if (cb) {
2094                 if (wolfSSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
2095                                                   conn) != 1)
2096                         return -1;
2097         } else {
2098                 if (wolfSSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
2099                         return -1;
2100         }
2101
2102         return 0;
2103 #else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2104         return -1;
2105 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
2106 }
2107
2108
2109 void tls_connection_set_success_data_resumed(struct tls_connection *conn)
2110 {
2111         wpa_printf(MSG_DEBUG,
2112                    "wolfSSL: Success data accepted for resumed session");
2113 }
2114
2115
2116 void tls_connection_remove_session(struct tls_connection *conn)
2117 {
2118         WOLFSSL_SESSION *sess;
2119
2120         sess = wolfSSL_get_session(conn->ssl);
2121         if (!sess)
2122                 return;
2123
2124         wolfSSL_SSL_SESSION_set_timeout(sess, 0);
2125         wpa_printf(MSG_DEBUG,
2126                    "wolfSSL: Removed cached session to disable session resumption");
2127 }
2128
2129
2130 void tls_connection_set_success_data(struct tls_connection *conn,
2131                                      struct wpabuf *data)
2132 {
2133         WOLFSSL_SESSION *sess;
2134         struct wpabuf *old;
2135
2136         wpa_printf(MSG_DEBUG, "wolfSSL: Set success data");
2137
2138         sess = wolfSSL_get_session(conn->ssl);
2139         if (!sess) {
2140                 wpa_printf(MSG_DEBUG,
2141                            "wolfSSL: No session found for success data");
2142                 goto fail;
2143         }
2144
2145         old = wolfSSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
2146         if (old) {
2147                 wpa_printf(MSG_DEBUG, "wolfSSL: Replacing old success data %p",
2148                            old);
2149                 wpabuf_free(old);
2150         }
2151         if (wolfSSL_SESSION_set_ex_data(sess, tls_ex_idx_session, data) != 1)
2152                 goto fail;
2153
2154         wpa_printf(MSG_DEBUG, "wolfSSL: Stored success data %p", data);
2155         conn->success_data = 1;
2156         return;
2157
2158 fail:
2159         wpa_printf(MSG_INFO, "wolfSSL: Failed to store success data");
2160         wpabuf_free(data);
2161 }
2162
2163
2164 const struct wpabuf *
2165 tls_connection_get_success_data(struct tls_connection *conn)
2166 {
2167         WOLFSSL_SESSION *sess;
2168
2169         wpa_printf(MSG_DEBUG, "wolfSSL: Get success data");
2170
2171         sess = wolfSSL_get_session(conn->ssl);
2172         if (!sess)
2173                 return NULL;
2174         return wolfSSL_SESSION_get_ex_data(sess, tls_ex_idx_session);
2175 }