summaryrefslogtreecommitdiffstats
path: root/src/plugins/nat/nat44_cli.c
AgeCommit message (Expand)AuthorFilesLines
2018-10-08NAT44: do not create session record for identity mapping (VPP-1439)Matus Fabian1-2/+2
2018-09-24Trivial: Clean up some typos.Paul Vinciguerra1-3/+3
2018-09-13NAT: TCP MSS clampingMatus Fabian1-0/+76
2018-09-04NAT: add support for configurable port range (VPP-1346)Matus Fabian1-1/+59
2018-09-03NAT44: client-IP based session affinity for load-balancing (VPP-1297)Matus Fabian1-3/+12
2018-08-27NAT44: add support for session timeout (VPP-1272)Matus Fabian1-50/+78
2018-08-02NAT44: LB NAT - local backends in multiple VRFs (VPP-1345)Matus Fabian1-7/+15
2018-06-15NAT44: endpoint dependent mode (VPP-1273)Matus Fabian1-7/+32
2018-05-28NAT44: code cleanup and refactor (VPP-1285)Matus Fabian1-1/+6
2018-05-17NAT44: nat44_del_session and nat44_user_session_details API update (VPP-1271)Matus Fabian1-5/+20
2018-05-08NAT44: TCP connection close detection (VPP-1266)Matus Fabian1-0/+44
2018-04-19Add special Twice-NAT feature (VPP-1221)Juraj Sloboda1-7/+12
2018-04-12NAT: disable CLI/API not supported in active mode (VPP-1234)Juraj Sloboda1-0/+79
2018-01-30NAT: replace format_vnet_sw_interface_name with format_vnet_sw_if_index_name ...Matus Fabian1-20/+16
2018-01-25NAT44: add opaque string tag to static mapping APIs (VPP-1147)Matus Fabian1-3/+3
2018-01-25NAT: nat.c refactor (split out CLI) (VPP-1140)Matus Fabian1-0/+1807
href='#n338'>338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686
/*
 * Copyright (c) 2018 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <mbedtls/ssl.h>
#include <mbedtls/certs.h>
#include <mbedtls/entropy.h>
#include <mbedtls/ctr_drbg.h>
#include <mbedtls/timing.h>
#include <mbedtls/debug.h>
#include <vnet/plugin/plugin.h>
#include <vpp/app/version.h>
#include <vnet/tls/tls.h>

#define TLS_USE_OUR_MEM_FUNCS	0

typedef struct tls_ctx_mbedtls_
{
  tls_ctx_t ctx;			/**< First */
  u32 mbedtls_ctx_index;
  mbedtls_ssl_context ssl;
  mbedtls_ssl_config conf;
  mbedtls_x509_crt srvcert;
  mbedtls_pk_context pkey;
} mbedtls_ctx_t;

typedef struct mbedtls_main_
{
  mbedtls_ctx_t ***ctx_pool;
  mbedtls_ctr_drbg_context *ctr_drbgs;
  mbedtls_entropy_context *entropy_pools;
  mbedtls_x509_crt cacert;
  u8 **rx_bufs;
  u8 **tx_bufs;
} mbedtls_main_t;

static mbedtls_main_t mbedtls_main;

#if TLS_USE_OUR_MEM_FUNCS
#include <mbedtls/platform.h>

void *
mbedtls_calloc_fn (size_t n, size_t size)
{
  void *ptr;
  ptr = clib_mem_alloc (n * size);
  clib_memset (ptr, 0, sizeof (*ptr));
  return ptr;
}

void
mbedtls_free_fn (void *ptr)
{
  if (ptr)
    clib_mem_free (ptr);
}
#endif

static u32
mbedtls_ctx_alloc (void)
{
  u8 thread_index = vlib_get_thread_index ();
  mbedtls_main_t *tm = &mbedtls_main;
  mbedtls_ctx_t **ctx;

  pool_get (tm->ctx_pool[thread_index], ctx);
  if (!(*ctx))
    *ctx = clib_mem_alloc (sizeof (mbedtls_ctx_t));

  clib_memset (*ctx, 0, sizeof (mbedtls_ctx_t));
  (*ctx)->ctx.c_thread_index = thread_index;
  (*ctx)->ctx.tls_ctx_engine = CRYPTO_ENGINE_MBEDTLS;
  (*ctx)->mbedtls_ctx_index = ctx - tm->ctx_pool[thread_index];
  return ((*ctx)->mbedtls_ctx_index);
}

static void
mbedtls_ctx_free (tls_ctx_t * ctx)
{
  mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;

  if (mc->ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER && !ctx->is_passive_close)
    mbedtls_ssl_close_notify (&mc->ssl);
  if (mc->ssl.conf->endpoint == MBEDTLS_SSL_IS_SERVER)
    {
      mbedtls_x509_crt_free (&mc->srvcert);
      mbedtls_pk_free (&mc->pkey);
    }
  mbedtls_ssl_free (&mc->ssl);
  mbedtls_ssl_config_free (&mc->conf);

  vec_free (ctx->srv_hostname);
  pool_put_index (mbedtls_main.ctx_pool[ctx->c_thread_index],
		  mc->mbedtls_ctx_index);
}

static tls_ctx_t *
mbedtls_ctx_get (u32 ctx_index)
{
  mbedtls_ctx_t **ctx;
  ctx = pool_elt_at_index (mbedtls_main.ctx_pool[vlib_get_thread_index ()],
			   ctx_index);
  return &(*ctx)->ctx;
}

static tls_ctx_t *
mbedtls_ctx_get_w_thread (u32 ctx_index, u8 thread_index)
{
  mbedtls_ctx_t **ctx;
  ctx = pool_elt_at_index (mbedtls_main.ctx_pool[thread_index], ctx_index);
  return &(*ctx)->ctx;
}

static int
tls_init_ctr_seed_drbgs (void)
{
  u32 thread_index = vlib_get_thread_index ();
  mbedtls_main_t *tm = &mbedtls_main;
  u8 *pers;
  int rv;
  pers = format (0, "vpp thread %u", thread_index);

  mbedtls_entropy_init (&tm->entropy_pools[thread_index]);
  mbedtls_ctr_drbg_init (&mbedtls_main.ctr_drbgs[thread_index]);
  if ((rv = mbedtls_ctr_drbg_seed (&tm->ctr_drbgs[thread_index],
				   mbedtls_entropy_func,
				   &tm->entropy_pools[thread_index],
				   (const unsigned char *) pers,
				   vec_len (pers))) != 0)
    {
      vec_free (pers);
      TLS_DBG (1, " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", rv);
      return -1;
    }
  vec_free (pers);
  return 0;
}

mbedtls_ctr_drbg_context *
tls_get_ctr_drbg ()
{
  u8 thread_index = vlib_get_thread_index ();
  if (PREDICT_FALSE (!mbedtls_main.ctr_drbgs[thread_index].f_entropy))
    tls_init_ctr_seed_drbgs ();
  return &mbedtls_main.ctr_drbgs[thread_index];
}

static int
tls_net_send (void *ctx_indexp, const unsigned char *buf, size_t len)
{
  session_t *tls_session;
  uword ctx_index;
  tls_ctx_t *ctx;
  int rv;

  ctx_index = pointer_to_uword (ctx_indexp);
  ctx = mbedtls_ctx_get (ctx_index);
  tls_session = session_get_from_handle (ctx->tls_session_handle);
  rv = svm_fifo_enqueue (tls_session->tx_fifo, len, buf);
  if (rv < 0)
    return MBEDTLS_ERR_SSL_WANT_WRITE;
  tls_add_vpp_q_tx_evt (tls_session);
  return rv;
}

static int
tls_net_recv (void *ctx_indexp, unsigned char *buf, size_t len)
{
  session_t *tls_session;
  uword ctx_index;
  tls_ctx_t *ctx;
  int rv;

  ctx_index = pointer_to_uword (ctx_indexp);
  ctx = mbedtls_ctx_get (ctx_index);
  tls_session = session_get_from_handle (ctx->tls_session_handle);
  rv = svm_fifo_dequeue (tls_session->rx_fifo, len, buf);
  return (rv < 0) ? 0 : rv;
}

static void
mbedtls_debug (void *ctx, int level, const char *file, int line,
	       const char *str)
{
  ((void) level);
  fprintf ((FILE *) ctx, "%s:%04d: %s", file, line, str);
  fflush ((FILE *) ctx);
}

static int
mbedtls_ctx_init_client (tls_ctx_t * ctx)
{
  mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
  mbedtls_main_t *mm = &mbedtls_main;
  void *ctx_ptr;
  int rv;

  /*
   * 1. Setup SSL
   */
  mbedtls_ssl_init (&mc->ssl);
  mbedtls_ssl_config_init (&mc->conf);
  if ((rv = mbedtls_ssl_config_defaults (&mc->conf, MBEDTLS_SSL_IS_CLIENT,
					 MBEDTLS_SSL_TRANSPORT_STREAM,
					 MBEDTLS_SSL_PRESET_DEFAULT)) != 0)
    {
      TLS_DBG (1, "failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n",
	       rv);
      return -1;
    }

  mbedtls_ssl_conf_authmode (&mc->conf, MBEDTLS_SSL_VERIFY_OPTIONAL);
  mbedtls_ssl_conf_ca_chain (&mc->conf, &mm->cacert, NULL);
  mbedtls_ssl_conf_rng (&mc->conf, mbedtls_ctr_drbg_random,
			tls_get_ctr_drbg ());
  mbedtls_ssl_conf_dbg (&mc->conf, mbedtls_debug, stdout);

  if ((rv = mbedtls_ssl_setup (&mc->ssl, &mc->conf)) != 0)
    {
      TLS_DBG (1, "failed\n  ! mbedtls_ssl_setup returned %d\n", rv);
      return -1;
    }

  if ((rv = mbedtls_ssl_set_hostname (&mc->ssl,
				      (const char *) ctx->srv_hostname)) != 0)
    {
      TLS_DBG (1, "failed\n  ! mbedtls_ssl_set_hostname returned %d\n", rv);
      return -1;
    }

  ctx_ptr = uword_to_pointer (mc->mbedtls_ctx_index, void *);
  mbedtls_ssl_set_bio (&mc->ssl, ctx_ptr, tls_net_send, tls_net_recv, NULL);
  mbedtls_debug_set_threshold (TLS_DEBUG_LEVEL_CLIENT);

  /*
   * 2. Do the first 2 steps in the handshake.
   */
  TLS_DBG (1, "Initiating handshake for [%u]%u", ctx->c_thread_index,
	   mc->mbedtls_ctx_index);
  while (mc->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
    {
      rv = mbedtls_ssl_handshake_step (&mc->ssl);
      if (rv != 0)
	break;
    }
  TLS_DBG (2, "tls state for [%u]%u is %u", ctx->c_thread_index,
	   mc->mbedtls_ctx_index, mc->ssl.state);
  return 0;
}

static int
mbedtls_start_listen (tls_ctx_t * lctx)
{
  return 0;
}

static int
mbedtls_stop_listen (tls_ctx_t * lctx)
{
  return 0;
}

static int
mbedtls_ctx_init_server (tls_ctx_t * ctx)
{
  mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
  mbedtls_main_t *mm = &mbedtls_main;
  app_cert_key_pair_t *ckpair;
  void *ctx_ptr;
  int rv;

  mbedtls_ssl_init (&mc->ssl);
  mbedtls_ssl_config_init (&mc->conf);
  mbedtls_x509_crt_init (&mc->srvcert);
  mbedtls_pk_init (&mc->pkey);

  /*
   * 1. Cert
   */
  ckpair = app_cert_key_pair_get_if_valid (ctx->ckpair_index);
  if (!ckpair)
    return -1;

  if (!ckpair->cert || !ckpair->key)
    {
      TLS_DBG (1, " failed\n  ! tls cert and/or key not configured %d",
	       ctx->parent_app_wrk_index);
      return -1;
    }

  rv = mbedtls_x509_crt_parse (&mc->srvcert,
			       (const unsigned char *) ckpair->cert,
			       vec_len (ckpair->cert));
  if (rv != 0)
    {
      TLS_DBG (1, " failed\n  !  mbedtls_x509_crt_parse returned %d", rv);
      goto exit;
    }

  rv = mbedtls_pk_parse_key (&mc->pkey,
			     (const unsigned char *) ckpair->key,
			     vec_len (ckpair->key), NULL, 0);
  if (rv != 0)
    {
      TLS_DBG (1, " failed\n  !  mbedtls_pk_parse_key returned %d", rv);
      goto exit;
    }

  /*
   * 2. SSL context config
   */
  if ((rv = mbedtls_ssl_config_defaults (&mc->conf, MBEDTLS_SSL_IS_SERVER,
					 MBEDTLS_SSL_TRANSPORT_STREAM,
					 MBEDTLS_SSL_PRESET_DEFAULT)) != 0)
    {
      TLS_DBG (1, " failed\n  ! mbedtls_ssl_config_defaults returned %d", rv);
      goto exit;
    }

  mbedtls_ssl_conf_rng (&mc->conf, mbedtls_ctr_drbg_random,
			tls_get_ctr_drbg ());
  mbedtls_ssl_conf_dbg (&mc->conf, mbedtls_debug, stdout);

  /* TODO CACHE
     mbedtls_ssl_conf_session_cache( &ctx->conf, &cache,
     mbedtls_ssl_cache_get,
     mbedtls_ssl_cache_set );
   */

  mbedtls_ssl_conf_ca_chain (&mc->conf, &mm->cacert, NULL);
  if ((rv = mbedtls_ssl_conf_own_cert (&mc->conf, &mc->srvcert, &mc->pkey))
      != 0)
    {
      TLS_DBG (1, " failed\n  ! mbedtls_ssl_conf_own_cert returned %d", rv);
      goto exit;
    }

  if ((rv = mbedtls_ssl_setup (&mc->ssl, &mc->conf)) != 0)
    {
      TLS_DBG (1, " failed\n  ! mbedtls_ssl_setup returned %d", rv);
      goto exit;
    }

  mbedtls_ssl_session_reset (&mc->ssl);
  ctx_ptr = uword_to_pointer (mc->mbedtls_ctx_index, void *);
  mbedtls_ssl_set_bio (&mc->ssl, ctx_ptr, tls_net_send, tls_net_recv, NULL);
  mbedtls_debug_set_threshold (TLS_DEBUG_LEVEL_SERVER);

  /*
   * 3. Start handshake state machine
   */
  TLS_DBG (1, "Initiating handshake for [%u]%u", ctx->c_thread_index,
	   mc->mbedtls_ctx_index);
  while (mc->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
    {
      rv = mbedtls_ssl_handshake_step (&mc->ssl);
      if (rv != 0)
	break;
    }

  TLS_DBG (2, "tls state for [%u]%u is %u", ctx->c_thread_index,
	   mc->mbedtls_ctx_index, mc->ssl.state);
  return 0;

exit:
  return -1;
}

static int
mbedtls_ctx_handshake_rx (tls_ctx_t * ctx)
{
  mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
  u32 flags;
  int rv;
  while (mc->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
    {
      rv = mbedtls_ssl_handshake_step (&mc->ssl);
      if (rv != 0)
	break;
    }
  TLS_DBG (2, "tls state for %u is %u", mc->mbedtls_ctx_index, mc->ssl.state);

  if (mc->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
    return 0;

  /*
   * Handshake complete
   */
  if (mc->ssl.conf->endpoint == MBEDTLS_SSL_IS_CLIENT)
    {
      /*
       * Verify server certificate
       */
      if ((flags = mbedtls_ssl_get_verify_result (&mc->ssl)) != 0)
	{
	  char buf[512];
	  TLS_DBG (1, " failed\n");
	  mbedtls_x509_crt_verify_info (buf, sizeof (buf), "  ! ", flags);
	  TLS_DBG (1, "%s\n", buf);

	  /*
	   * Presence of hostname enforces strict certificate verification
	   */
	  if (ctx->srv_hostname)
	    {
	      tls_notify_app_connected (ctx, SESSION_E_TLS_HANDSHAKE);
	      return -1;
	    }
	}
      tls_notify_app_connected (ctx, SESSION_E_NONE);
    }
  else
    {
      tls_notify_app_accept (ctx);
    }

  TLS_DBG (1, "Handshake for %u complete. TLS cipher is %x",
	   mc->mbedtls_ctx_index, mc->ssl.session->ciphersuite);
  return 0;
}

static int
mbedtls_ctx_write (tls_ctx_t * ctx, session_t * app_session,
		   transport_send_params_t * sp)
{
  mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
  u8 thread_index = ctx->c_thread_index;
  mbedtls_main_t *mm = &mbedtls_main;
  u32 enq_max, deq_max, deq_now;
  session_t *tls_session;
  int wrote;

  ASSERT (mc->ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER);

  deq_max = svm_fifo_max_dequeue_cons (app_session->tx_fifo);
  if (!deq_max)
    return 0;

  deq_max = clib_min (deq_max, sp->max_burst_size);
  tls_session = session_get_from_handle (ctx->tls_session_handle);
  enq_max = svm_fifo_max_enqueue_prod (tls_session->tx_fifo);
  deq_now = clib_min (deq_max, TLS_CHUNK_SIZE);

  if (PREDICT_FALSE (enq_max == 0))
    {
      app_session->flags |= SESSION_F_CUSTOM_TX;
      return 0;
    }

  vec_validate (mm->tx_bufs[thread_index], deq_now);
  svm_fifo_peek (app_session->tx_fifo, 0, deq_now, mm->tx_bufs[thread_index]);

  wrote = mbedtls_ssl_write (&mc->ssl, mm->tx_bufs[thread_index], deq_now);
  if (wrote <= 0)
    {
      app_session->flags |= SESSION_F_CUSTOM_TX;
      return 0;
    }

  svm_fifo_dequeue_drop (app_session->tx_fifo, wrote);
  vec_reset_length (mm->tx_bufs[thread_index]);
  tls_add_vpp_q_tx_evt (tls_session);

  if (deq_now < deq_max)
    app_session->flags |= SESSION_F_CUSTOM_TX;

  return 0;
}

static int
mbedtls_ctx_read (tls_ctx_t * ctx, session_t * tls_session)
{
  mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
  mbedtls_main_t *mm = &mbedtls_main;
  u8 thread_index = ctx->c_thread_index;
  u32 deq_max, enq_max, enq_now;
  session_t *app_session;
  int read, enq;

  if (PREDICT_FALSE (mc->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER))
    {
      mbedtls_ctx_handshake_rx (ctx);
      return 0;
    }

  deq_max = svm_fifo_max_dequeue_cons (tls_session->rx_fifo);
  if (!deq_max)
    return 0;

  app_session = session_get_from_handle (ctx->app_session_handle);
  enq_max = svm_fifo_max_enqueue_prod (app_session->rx_fifo);
  enq_now = clib_min (enq_max, TLS_CHUNK_SIZE);

  if (PREDICT_FALSE (enq_now == 0))
    {
      tls_add_vpp_q_builtin_rx_evt (tls_session);
      return 0;
    }

  vec_validate (mm->rx_bufs[thread_index], enq_now);
  read = mbedtls_ssl_read (&mc->ssl, mm->rx_bufs[thread_index], enq_now);
  if (read <= 0)
    {
      tls_add_vpp_q_builtin_rx_evt (tls_session);
      return 0;
    }

  enq = svm_fifo_enqueue (app_session->rx_fifo, read,
			  mm->rx_bufs[thread_index]);
  ASSERT (enq == read);
  vec_reset_length (mm->rx_bufs[thread_index]);

  if (svm_fifo_max_dequeue_cons (tls_session->rx_fifo))
    tls_add_vpp_q_builtin_rx_evt (tls_session);

  if (enq > 0)
    tls_notify_app_enqueue (ctx, app_session);

  return enq;
}

static u8
mbedtls_handshake_is_over (tls_ctx_t * ctx)
{
  mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
  return (mc->ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER);
}

static int
mbedtls_transport_close (tls_ctx_t * ctx)
{
  if (!mbedtls_handshake_is_over (ctx))
    {
      session_close (session_get_from_handle (ctx->tls_session_handle));
      return 0;
    }
  session_transport_closing_notify (&ctx->connection);
  return 0;
}

static int
mbedtls_app_close (tls_ctx_t * ctx)
{
  tls_disconnect_transport (ctx);
  session_transport_delete_notify (&ctx->connection);
  mbedtls_ctx_free (ctx);
  return 0;
}

const static tls_engine_vft_t mbedtls_engine = {
  .ctx_alloc = mbedtls_ctx_alloc,
  .ctx_free = mbedtls_ctx_free,
  .ctx_get = mbedtls_ctx_get,
  .ctx_get_w_thread = mbedtls_ctx_get_w_thread,
  .ctx_init_server = mbedtls_ctx_init_server,
  .ctx_init_client = mbedtls_ctx_init_client,
  .ctx_write = mbedtls_ctx_write,
  .ctx_read = mbedtls_ctx_read,
  .ctx_handshake_is_over = mbedtls_handshake_is_over,
  .ctx_start_listen = mbedtls_start_listen,
  .ctx_stop_listen = mbedtls_stop_listen,
  .ctx_transport_close = mbedtls_transport_close,
  .ctx_app_close = mbedtls_app_close,
};

int
tls_init_mem (void)
{
#if TLS_USE_OUR_MEM_FUNCS
  mbedtls_platform_set_calloc_free (mbedtls_calloc_fn, mbedtls_free_fn);
#endif
  return 0;
}

static int
tls_init_ctr_drbgs_and_entropy (u32 num_threads)
{
  mbedtls_main_t *mm = &mbedtls_main;
  int i;

  vec_validate (mm->ctr_drbgs, num_threads - 1);
  vec_validate (mm->entropy_pools, num_threads - 1);
  for (i = 0; i < num_threads; i++)
    mm->ctr_drbgs[i].f_entropy = 0;

  return 0;
}

int
tls_init_ca_chain (void)
{
  mbedtls_main_t *mm = &mbedtls_main;
  tls_main_t *tm = vnet_tls_get_main ();
  int rv;

  if (access (tm->ca_cert_path, F_OK | R_OK) == -1)
    {
      clib_warning ("Could not initialize TLS CA certificates");
      return -1;
    }

  mbedtls_x509_crt_init (&mm->cacert);
  rv = mbedtls_x509_crt_parse_file (&mm->cacert, tm->ca_cert_path);
  if (rv < 0)
    {
      clib_warning ("Couldn't parse system CA certificates: -0x%x", -rv);
    }
  if (tm->use_test_cert_in_ca)
    {
      rv = mbedtls_x509_crt_parse (&mm->cacert,
				   (const unsigned char *) test_srv_crt_rsa,
				   test_srv_crt_rsa_len);
      if (rv < 0)
	{
	  clib_warning ("Couldn't parse test certificate: -0x%x", -rv);
	  return -1;
	}
    }
  return (rv < 0 ? -1 : 0);
}

static clib_error_t *
tls_mbedtls_init (vlib_main_t * vm)
{
  vlib_thread_main_t *vtm = vlib_get_thread_main ();
  mbedtls_main_t *mm = &mbedtls_main;
  u32 num_threads;

  num_threads = 1 /* main thread */  + vtm->n_threads;

  if (tls_init_ca_chain ())
    {
      clib_warning ("failed to initialize TLS CA chain");
      return 0;
    }
  if (tls_init_mem ())
    {
      clib_warning ("failed to initialize mem");
      return 0;
    }
  if (tls_init_ctr_drbgs_and_entropy (num_threads))
    {
      clib_warning ("failed to initialize entropy and random generators");
      return 0;
    }

  vec_validate (mm->ctx_pool, num_threads - 1);
  vec_validate (mm->rx_bufs, num_threads - 1);
  vec_validate (mm->tx_bufs, num_threads - 1);

  tls_register_engine (&mbedtls_engine, CRYPTO_ENGINE_MBEDTLS);
  return 0;
}

/* *INDENT-OFF* */
VLIB_INIT_FUNCTION (tls_mbedtls_init) =
{
  .runs_after = VLIB_INITS("tls_init"),
};
/* *INDENT-ON* */

/* *INDENT-OFF* */
VLIB_PLUGIN_REGISTER () = {
    .version = VPP_BUILD_VER,
    .description = "Transport Layer Security (TLS) Engine, Mbedtls Based",
};
/* *INDENT-ON* */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */