tls: make tls engines pluggable

- add infra for pluggable tls "engines"
- makes mbedtls specific code a plugin

Change-Id: I2c5b099e2b69d2be0038e3ef02b208ff907727e7
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 0 insertions, 1234 deletions

diff --git a/src/vnet/session-apps/tls.c b/src/vnet/session-apps/tls.c
deleted file mode 100644
index d71dfb43d3c..00000000000
--- a/src/vnet/session-apps/tls.c
+++ /dev/null
@@ -1,1234 +0,0 @@
-/*
- * 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 <vnet/session/application_interface.h>
-#include <vppinfra/lock.h>
-#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>
-
-#define TLS_DEBUG 		0
-#define TLS_DEBUG_LEVEL_CLIENT 	0
-#define TLS_DEBUG_LEVEL_SERVER 	0
-
-#define TLS_CHUNK_SIZE 		(1 << 14)
-#define TLS_USE_OUR_MEM_FUNCS	0
-#define TLS_CA_CERT_PATH	"/etc/ssl/certs/ca-certificates.crt"
-
-#if TLS_DEBUG
-#define TLS_DBG(_lvl, _fmt, _args...) 			\
-  if (_lvl <= TLS_DEBUG) 				\
-    clib_warning (_fmt, ##_args)
-#else
-#define TLS_DBG(_fmt, _args...)
-#endif
-
-#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);
-  memset (ptr, 0, sizeof (*ptr));
-  return ptr;
-}
-
-void
-mbedtls_free_fn (void *ptr)
-{
-  if (ptr)
-    clib_mem_free (ptr);
-}
-#endif
-
-/* *INDENT-OFF* */
-typedef CLIB_PACKED (struct tls_cxt_id_
-{
-  u32 parent_app_index;
-  session_handle_t app_session_handle;
-  session_handle_t tls_session_handle;
-  u32 listener_ctx_index;
-  u8 tcp_is_ip4;
-}) tls_ctx_id_t;
-/* *INDENT-ON* */
-
-STATIC_ASSERT (sizeof (tls_ctx_id_t) <= 42, "ctx id must be less than 42");
-
-typedef struct tls_ctx_
-{
-  union
-  {
-    transport_connection_t connection;
-    tls_ctx_id_t c_tls_ctx_id;
-  };
-#define parent_app_index c_tls_ctx_id.parent_app_index
-#define app_session_handle c_tls_ctx_id.app_session_handle
-#define tls_session_handle c_tls_ctx_id.tls_session_handle
-#define listener_ctx_index c_tls_ctx_id.listener_ctx_index
-#define tcp_is_ip4 c_tls_ctx_id.tcp_is_ip4
-#define tls_ctx_idx c_c_index
-  /* Temporary storage for session open opaque. Overwritten once
-   * underlying tcp connection is established */
-#define parent_app_api_context c_s_index
-
-  u8 is_passive_close;
-  u8 *srv_hostname;
-  mbedtls_ssl_context ssl;
-  mbedtls_ssl_config conf;
-  mbedtls_x509_crt srvcert;
-  mbedtls_pk_context pkey;
-} tls_ctx_t;
-
-typedef struct tls_main_
-{
-  u32 app_index;
-  tls_ctx_t ***ctx_pool;
-  mbedtls_ctr_drbg_context *ctr_drbgs;
-  mbedtls_entropy_context *entropy_pools;
-  tls_ctx_t *listener_ctx_pool;
-  tls_ctx_t *half_open_ctx_pool;
-  clib_rwlock_t half_open_rwlock;
-  mbedtls_x509_crt cacert;
-
-  /*
-   * Config
-   */
-  u8 use_test_cert_in_ca;
-  char *ca_cert_path;
-} tls_main_t;
-
-static tls_main_t tls_main;
-
-void tls_disconnect (u32 ctx_index, u32 thread_index);
-
-static inline int
-tls_add_vpp_q_evt (svm_fifo_t * f, u8 evt_type)
-{
-  session_fifo_event_t evt;
-  svm_queue_t *q;
-
-  if (svm_fifo_set_event (f))
-    {
-      evt.fifo = f;
-      evt.event_type = evt_type;
-
-      q = session_manager_get_vpp_event_queue (f->master_thread_index);
-      if (PREDICT_TRUE (q->cursize < q->maxsize))
-	{
-	  svm_queue_add (q, (u8 *) & evt, 0 /* do wait for mutex */ );
-	}
-      else
-	{
-	  clib_warning ("vpp's evt q full");
-	  return -1;
-	}
-    }
-  return 0;
-}
-
-static inline int
-tls_add_app_q_evt (application_t * app, stream_session_t * app_session)
-{
-  session_fifo_event_t evt;
-  svm_queue_t *q;
-
-  if (PREDICT_FALSE (app_session->session_state == SESSION_STATE_CLOSED))
-    {
-      /* Session is closed so app will never clean up. Flush rx fifo */
-      u32 to_dequeue = svm_fifo_max_dequeue (app_session->server_rx_fifo);
-      if (to_dequeue)
-	svm_fifo_dequeue_drop (app_session->server_rx_fifo, to_dequeue);
-      return 0;
-    }
-
-  if (app->cb_fns.builtin_app_rx_callback)
-    return app->cb_fns.builtin_app_rx_callback (app_session);
-
-  if (svm_fifo_set_event (app_session->server_rx_fifo))
-    {
-      evt.fifo = app_session->server_rx_fifo;
-      evt.event_type = FIFO_EVENT_APP_RX;
-      q = app->event_queue;
-
-      if (PREDICT_TRUE (q->cursize < q->maxsize))
-	{
-	  svm_queue_add (q, (u8 *) & evt, 0 /* do wait for mutex */ );
-	}
-      else
-	{
-	  clib_warning ("app evt q full");
-	  return -1;
-	}
-    }
-  return 0;
-}
-
-u32
-tls_ctx_alloc (void)
-{
-  u8 thread_index = vlib_get_thread_index ();
-  tls_main_t *tm = &tls_main;
-  tls_ctx_t **ctx;
-
-  pool_get (tm->ctx_pool[thread_index], ctx);
-  if (!(*ctx))
-    *ctx = clib_mem_alloc (sizeof (tls_ctx_t));
-
-  memset (*ctx, 0, sizeof (tls_ctx_t));
-  (*ctx)->c_thread_index = thread_index;
-  return ctx - tm->ctx_pool[thread_index];
-}
-
-void
-tls_ctx_free (tls_ctx_t * ctx)
-{
-  vec_free (ctx->srv_hostname);
-  pool_put_index (tls_main.ctx_pool[vlib_get_thread_index ()],
-		  ctx->tls_ctx_idx);
-}
-
-tls_ctx_t *
-tls_ctx_get (u32 ctx_index)
-{
-  tls_ctx_t **ctx;
-  ctx = pool_elt_at_index (tls_main.ctx_pool[vlib_get_thread_index ()],
-			   ctx_index);
-  return (*ctx);
-}
-
-tls_ctx_t *
-tls_ctx_get_w_thread (u32 ctx_index, u8 thread_index)
-{
-  tls_ctx_t **ctx;
-  ctx = pool_elt_at_index (tls_main.ctx_pool[thread_index], ctx_index);
-  return (*ctx);
-}
-
-u32
-tls_listener_ctx_alloc (void)
-{
-  tls_main_t *tm = &tls_main;
-  tls_ctx_t *ctx;
-
-  pool_get (tm->listener_ctx_pool, ctx);
-  memset (ctx, 0, sizeof (*ctx));
-  return ctx - tm->listener_ctx_pool;
-}
-
-void
-tls_listener_ctx_free (tls_ctx_t * ctx)
-{
-  pool_put (tls_main.listener_ctx_pool, ctx);
-}
-
-tls_ctx_t *
-tls_listener_ctx_get (u32 ctx_index)
-{
-  return pool_elt_at_index (tls_main.listener_ctx_pool, ctx_index);
-}
-
-u32
-tls_listener_ctx_index (tls_ctx_t * ctx)
-{
-  return (ctx - tls_main.listener_ctx_pool);
-}
-
-u32
-tls_ctx_half_open_alloc (void)
-{
-  tls_main_t *tm = &tls_main;
-  u8 will_expand = 0;
-  tls_ctx_t *ctx;
-  u32 ctx_index;
-
-  pool_get_aligned_will_expand (tm->half_open_ctx_pool, will_expand, 0);
-  if (PREDICT_FALSE (will_expand && vlib_num_workers ()))
-    {
-      clib_rwlock_writer_lock (&tm->half_open_rwlock);
-      pool_get (tm->half_open_ctx_pool, ctx);
-      memset (ctx, 0, sizeof (*ctx));
-      ctx_index = ctx - tm->half_open_ctx_pool;
-      clib_rwlock_writer_unlock (&tm->half_open_rwlock);
-    }
-  else
-    {
-      pool_get (tm->half_open_ctx_pool, ctx);
-      memset (ctx, 0, sizeof (*ctx));
-      ctx_index = ctx - tm->half_open_ctx_pool;
-    }
-  return ctx_index;
-}
-
-void
-tls_ctx_half_open_free (u32 ho_index)
-{
-  tls_main_t *tm = &tls_main;
-  clib_rwlock_writer_lock (&tm->half_open_rwlock);
-  pool_put_index (tls_main.half_open_ctx_pool, ho_index);
-  clib_rwlock_writer_unlock (&tm->half_open_rwlock);
-}
-
-tls_ctx_t *
-tls_ctx_half_open_get (u32 ctx_index)
-{
-  tls_main_t *tm = &tls_main;
-  clib_rwlock_reader_lock (&tm->half_open_rwlock);
-  return pool_elt_at_index (tm->half_open_ctx_pool, ctx_index);
-}
-
-void
-tls_ctx_half_open_reader_unlock ()
-{
-  clib_rwlock_reader_unlock (&tls_main.half_open_rwlock);
-}
-
-u32
-tls_ctx_half_open_index (tls_ctx_t * ctx)
-{
-  return (ctx - tls_main.half_open_ctx_pool);
-}
-
-static int
-tls_init_ctr_drbgs_and_entropy (u32 num_threads)
-{
-  tls_main_t *tm = &tls_main;
-  int i;
-
-  vec_validate (tm->ctr_drbgs, num_threads - 1);
-  vec_validate (tm->entropy_pools, num_threads - 1);
-  for (i = 0; i < num_threads; i++)
-    tls_main.ctr_drbgs[i].f_entropy = 0;
-
-  return 0;
-}
-
-static int
-tls_init_ctr_seed_drbgs (void)
-{
-  u32 thread_index = vlib_get_thread_index ();
-  tls_main_t *tm = &tls_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 (&tls_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 (!tls_main.ctr_drbgs[thread_index].f_entropy))
-    tls_init_ctr_seed_drbgs ();
-  return &tls_main.ctr_drbgs[thread_index];
-}
-
-static int
-tls_net_send (void *ctx_indexp, const unsigned char *buf, size_t len)
-{
-  stream_session_t *tls_session;
-  uword ctx_index;
-  tls_ctx_t *ctx;
-  int rv;
-
-  ctx_index = pointer_to_uword (ctx_indexp);
-  ctx = tls_ctx_get (ctx_index);
-  tls_session = session_get_from_handle (ctx->tls_session_handle);
-  rv = svm_fifo_enqueue_nowait (tls_session->server_tx_fifo, len, buf);
-  if (rv < 0)
-    return MBEDTLS_ERR_SSL_WANT_WRITE;
-  tls_add_vpp_q_evt (tls_session->server_tx_fifo, FIFO_EVENT_APP_TX);
-  return rv;
-}
-
-static int
-tls_net_recv (void *ctx_indexp, unsigned char *buf, size_t len)
-{
-  stream_session_t *tls_session;
-  uword ctx_index;
-  tls_ctx_t *ctx;
-  int rv;
-
-  ctx_index = pointer_to_uword (ctx_indexp);
-  ctx = tls_ctx_get (ctx_index);
-  tls_session = session_get_from_handle (ctx->tls_session_handle);
-  rv = svm_fifo_dequeue_nowait (tls_session->server_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
-tls_ctx_init_client (tls_ctx_t * ctx)
-{
-  tls_main_t *tm = &tls_main;
-  void *ctx_ptr;
-  int rv;
-
-  /*
-   * 1. Setup SSL
-   */
-  mbedtls_ssl_init (&ctx->ssl);
-  mbedtls_ssl_config_init (&ctx->conf);
-  if ((rv = mbedtls_ssl_config_defaults (&ctx->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 (&ctx->conf, MBEDTLS_SSL_VERIFY_OPTIONAL);
-  mbedtls_ssl_conf_ca_chain (&ctx->conf, &tm->cacert, NULL);
-  mbedtls_ssl_conf_rng (&ctx->conf, mbedtls_ctr_drbg_random,
-			tls_get_ctr_drbg ());
-  mbedtls_ssl_conf_dbg (&ctx->conf, mbedtls_debug, stdout);
-
-  if ((rv = mbedtls_ssl_setup (&ctx->ssl, &ctx->conf)) != 0)
-    {
-      TLS_DBG (1, "failed\n  ! mbedtls_ssl_setup returned %d\n", rv);
-      return -1;
-    }
-
-  if ((rv = mbedtls_ssl_set_hostname (&ctx->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 (ctx->tls_ctx_idx, void *);
-  mbedtls_ssl_set_bio (&ctx->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,
-	   ctx->tls_ctx_idx);
-  while (ctx->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
-    {
-      rv = mbedtls_ssl_handshake_step (&ctx->ssl);
-      if (rv != 0)
-	break;
-    }
-  TLS_DBG (2, "tls state for [%u]%u is %u", ctx->c_thread_index,
-	   ctx->tls_ctx_idx, ctx->ssl.state);
-  return 0;
-}
-
-static int
-tls_ctx_init_server (tls_ctx_t * ctx)
-{
-  tls_main_t *tm = &tls_main;
-  application_t *app;
-  void *ctx_ptr;
-  int rv;
-
-  mbedtls_ssl_init (&ctx->ssl);
-  mbedtls_ssl_config_init (&ctx->conf);
-  mbedtls_x509_crt_init (&ctx->srvcert);
-  mbedtls_pk_init (&ctx->pkey);
-
-  /*
-   * 1. Cert
-   */
-  app = application_get (ctx->parent_app_index);
-  if (!app->tls_cert || !app->tls_key)
-    {
-      TLS_DBG (1, " failed\n  ! tls cert and/or key not configured %d",
-	       ctx->parent_app_index);
-      return -1;
-    }
-
-  rv = mbedtls_x509_crt_parse (&ctx->srvcert,
-			       (const unsigned char *) app->tls_cert,
-			       vec_len (app->tls_cert));
-  if (rv != 0)
-    {
-      TLS_DBG (1, " failed\n  !  mbedtls_x509_crt_parse returned %d", rv);
-      goto exit;
-    }
-
-  rv = mbedtls_pk_parse_key (&ctx->pkey,
-			     (const unsigned char *) app->tls_key,
-			     vec_len (app->tls_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 (&ctx->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 (&ctx->conf, mbedtls_ctr_drbg_random,
-			tls_get_ctr_drbg ());
-  mbedtls_ssl_conf_dbg (&ctx->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 (&ctx->conf, &tm->cacert, NULL);
-  if ((rv = mbedtls_ssl_conf_own_cert (&ctx->conf, &ctx->srvcert, &ctx->pkey))
-      != 0)
-    {
-      TLS_DBG (1, " failed\n  ! mbedtls_ssl_conf_own_cert returned %d", rv);
-      goto exit;
-    }
-
-  if ((rv = mbedtls_ssl_setup (&ctx->ssl, &ctx->conf)) != 0)
-    {
-      TLS_DBG (1, " failed\n  ! mbedtls_ssl_setup returned %d", rv);
-      goto exit;
-    }
-
-  mbedtls_ssl_session_reset (&ctx->ssl);
-  ctx_ptr = uword_to_pointer (ctx->tls_ctx_idx, void *);
-  mbedtls_ssl_set_bio (&ctx->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,
-	   ctx->tls_ctx_idx);
-  while (ctx->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
-    {
-      rv = mbedtls_ssl_handshake_step (&ctx->ssl);
-      if (rv != 0)
-	break;
-    }
-
-  TLS_DBG (2, "tls state for [%u]%u is %u", ctx->c_thread_index,
-	   ctx->tls_ctx_idx, ctx->ssl.state);
-  return 0;
-
-exit:
-  return -1;
-}
-
-static int
-tls_notify_app_accept (tls_ctx_t * ctx)
-{
-  stream_session_t *app_listener, *app_session;
-  segment_manager_t *sm;
-  application_t *app;
-  tls_ctx_t *lctx;
-  int rv;
-
-  app = application_get (ctx->parent_app_index);
-  lctx = tls_listener_ctx_get (ctx->listener_ctx_index);
-  app_listener = listen_session_get_from_handle (lctx->app_session_handle);
-  sm = application_get_listen_segment_manager (app, app_listener);
-
-  app_session = session_alloc (vlib_get_thread_index ());
-  app_session->app_index = ctx->parent_app_index;
-  app_session->connection_index = ctx->tls_ctx_idx;
-  app_session->session_type = app_listener->session_type;
-  app_session->listener_index = app_listener->session_index;
-  if ((rv = session_alloc_fifos (sm, app_session)))
-    {
-      TLS_DBG (1, "failed to allocate fifos");
-      return rv;
-    }
-  ctx->c_s_index = app_session->session_index;
-  ctx->app_session_handle = session_handle (app_session);
-  return app->cb_fns.session_accept_callback (app_session);
-}
-
-static int
-tls_notify_app_connected (tls_ctx_t * ctx, u8 is_failed)
-{
-  int (*cb_fn) (u32, u32, stream_session_t *, u8);
-  stream_session_t *app_session;
-  segment_manager_t *sm;
-  application_t *app;
-
-  app = application_get (ctx->parent_app_index);
-  cb_fn = app->cb_fns.session_connected_callback;
-
-  if (is_failed)
-    goto failed;
-
-  sm = application_get_connect_segment_manager (app);
-  app_session = session_alloc (vlib_get_thread_index ());
-  app_session->app_index = ctx->parent_app_index;
-  app_session->connection_index = ctx->tls_ctx_idx;
-  app_session->session_type =
-    session_type_from_proto_and_ip (TRANSPORT_PROTO_TLS, ctx->tcp_is_ip4);
-  if (session_alloc_fifos (sm, app_session))
-    goto failed;
-
-  ctx->app_session_handle = session_handle (app_session);
-  ctx->c_s_index = app_session->session_index;
-  app_session->session_state = SESSION_STATE_READY;
-  if (cb_fn (ctx->parent_app_index, ctx->parent_app_api_context,
-	     app_session, 0 /* not failed */ ))
-    {
-      TLS_DBG (1, "failed to notify app");
-      tls_disconnect (ctx->tls_ctx_idx, vlib_get_thread_index ());
-    }
-
-  return 0;
-
-failed:
-  return cb_fn (ctx->parent_app_index, ctx->parent_app_api_context, 0,
-		1 /* failed */ );
-}
-
-static int
-tls_handshake_rx (tls_ctx_t * ctx)
-{
-  u32 flags;
-  int rv;
-  while (ctx->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
-    {
-      rv = mbedtls_ssl_handshake_step (&ctx->ssl);
-      if (rv != 0)
-	break;
-    }
-  TLS_DBG (2, "tls state for %u is %u", ctx->tls_ctx_idx, ctx->ssl.state);
-
-  if (ctx->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
-    return 0;
-
-  /*
-   * Handshake complete
-   */
-  if (ctx->ssl.conf->endpoint == MBEDTLS_SSL_IS_CLIENT)
-    {
-      /*
-       * Verify server certificate
-       */
-      if ((flags = mbedtls_ssl_get_verify_result (&ctx->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_disconnect (ctx->tls_ctx_idx, vlib_get_thread_index ());
-	      tls_notify_app_connected (ctx, /* is failed */ 1);
-	      return -1;
-	    }
-	}
-      tls_notify_app_connected (ctx, /* is failed */ 0);
-    }
-  else
-    {
-      tls_notify_app_accept (ctx);
-    }
-
-  TLS_DBG (1, "Handshake for %u complete. TLS cipher is %x",
-	   ctx->tls_ctx_idx, ctx->ssl.session->ciphersuite);
-  return 0;
-}
-
-void
-tls_session_reset_callback (stream_session_t * s)
-{
-  clib_warning ("called...");
-}
-
-int
-tls_add_segment_callback (u32 client_index, const ssvm_private_t * fs)
-{
-  /* No-op for builtin */
-  return 0;
-}
-
-int
-tls_del_segment_callback (u32 client_index, const ssvm_private_t * fs)
-{
-  return 0;
-}
-
-void
-tls_session_disconnect_callback (stream_session_t * tls_session)
-{
-  stream_session_t *app_session;
-  tls_ctx_t *ctx;
-  application_t *app;
-
-  ctx = tls_ctx_get (tls_session->opaque);
-  if (ctx->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
-    {
-      stream_session_disconnect (tls_session);
-      return;
-    }
-  ctx->is_passive_close = 1;
-  app = application_get (ctx->parent_app_index);
-  app_session = session_get_from_handle (ctx->app_session_handle);
-  app->cb_fns.session_disconnect_callback (app_session);
-}
-
-int
-tls_session_accept_callback (stream_session_t * tls_session)
-{
-  stream_session_t *tls_listener;
-  tls_ctx_t *lctx, *ctx;
-  u32 ctx_index;
-
-  tls_listener = listen_session_get (tls_session->session_type,
-				     tls_session->listener_index);
-  lctx = tls_listener_ctx_get (tls_listener->opaque);
-  ctx_index = tls_ctx_alloc ();
-  ctx = tls_ctx_get (ctx_index);
-  memcpy (ctx, lctx, sizeof (*lctx));
-  ctx->c_thread_index = vlib_get_thread_index ();
-  ctx->tls_ctx_idx = ctx_index;
-  tls_session->session_state = SESSION_STATE_READY;
-  tls_session->opaque = ctx_index;
-  ctx->tls_session_handle = session_handle (tls_session);
-  ctx->listener_ctx_index = tls_listener->opaque;
-
-  TLS_DBG (1, "Accept on listener %u new connection [%u]%u",
-	   tls_listener->opaque, vlib_get_thread_index (), ctx_index);
-
-  return tls_ctx_init_server (ctx);
-}
-
-int
-tls_app_tx_callback (stream_session_t * app_session)
-{
-  stream_session_t *tls_session;
-  tls_ctx_t *ctx;
-  static u8 *tmp_buf;
-  u32 enq_max, deq_max, deq_now;
-  int wrote;
-
-  ctx = tls_ctx_get (app_session->connection_index);
-  if (ctx->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
-    tls_add_vpp_q_evt (app_session->server_tx_fifo, FIFO_EVENT_APP_TX);
-
-  deq_max = svm_fifo_max_dequeue (app_session->server_tx_fifo);
-  if (!deq_max)
-    return 0;
-
-  tls_session = session_get_from_handle (ctx->tls_session_handle);
-  enq_max = svm_fifo_max_enqueue (tls_session->server_tx_fifo);
-  deq_now = clib_min (deq_max, TLS_CHUNK_SIZE);
-
-  if (PREDICT_FALSE (enq_max == 0))
-    {
-      tls_add_vpp_q_evt (app_session->server_tx_fifo, FIFO_EVENT_APP_TX);
-      return 0;
-    }
-
-  vec_validate (tmp_buf, deq_now);
-  svm_fifo_peek (app_session->server_tx_fifo, 0, deq_now, tmp_buf);
-  wrote = mbedtls_ssl_write (&ctx->ssl, tmp_buf, deq_now);
-  if (wrote <= 0)
-    {
-      tls_add_vpp_q_evt (app_session->server_tx_fifo, FIFO_EVENT_APP_TX);
-      return 0;
-    }
-
-  svm_fifo_dequeue_drop (app_session->server_tx_fifo, wrote);
-  vec_reset_length (tmp_buf);
-
-  tls_add_vpp_q_evt (tls_session->server_tx_fifo, FIFO_EVENT_APP_TX);
-
-  if (deq_now < deq_max)
-    tls_add_vpp_q_evt (app_session->server_tx_fifo, FIFO_EVENT_APP_TX);
-
-  return 0;
-}
-
-int
-tls_app_rx_callback (stream_session_t * tls_session)
-{
-  stream_session_t *app_session;
-  u32 deq_max, enq_max, enq_now;
-  application_t *app;
-  static u8 *tmp_buf;
-  tls_ctx_t *ctx;
-  int read, enq;
-
-  ctx = tls_ctx_get (tls_session->opaque);
-  if (ctx->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
-    return tls_handshake_rx (ctx);
-
-  deq_max = svm_fifo_max_dequeue (tls_session->server_rx_fifo);
-  if (!deq_max)
-    return 0;
-
-  app_session = session_get_from_handle (ctx->app_session_handle);
-  enq_max = svm_fifo_max_enqueue (app_session->server_rx_fifo);
-  enq_now = clib_min (enq_max, TLS_CHUNK_SIZE);
-
-  if (PREDICT_FALSE (enq_now == 0))
-    {
-      tls_add_vpp_q_evt (tls_session->server_rx_fifo, FIFO_EVENT_BUILTIN_RX);
-      return 0;
-    }
-
-  vec_validate (tmp_buf, enq_now);
-  read = mbedtls_ssl_read (&ctx->ssl, tmp_buf, enq_now);
-  if (read <= 0)
-    {
-      tls_add_vpp_q_evt (tls_session->server_rx_fifo, FIFO_EVENT_BUILTIN_RX);
-      return 0;
-    }
-
-  enq = svm_fifo_enqueue_nowait (app_session->server_rx_fifo, read, tmp_buf);
-  ASSERT (enq == read);
-  vec_reset_length (tmp_buf);
-
-  if (svm_fifo_max_dequeue (tls_session->server_rx_fifo))
-    tls_add_vpp_q_evt (tls_session->server_rx_fifo, FIFO_EVENT_BUILTIN_RX);
-
-  app = application_get_if_valid (app_session->app_index);
-  return tls_add_app_q_evt (app, app_session);
-}
-
-int
-tls_session_connected_callback (u32 tls_app_index, u32 ho_ctx_index,
-				stream_session_t * tls_session, u8 is_fail)
-{
-  int (*cb_fn) (u32, u32, stream_session_t *, u8);
-  application_t *app;
-  tls_ctx_t *ho_ctx, *ctx;
-  u32 ctx_index;
-
-  ho_ctx = tls_ctx_half_open_get (ho_ctx_index);
-  app = application_get (ho_ctx->parent_app_index);
-  cb_fn = app->cb_fns.session_connected_callback;
-
-  if (is_fail)
-    {
-      tls_ctx_half_open_reader_unlock ();
-      tls_ctx_half_open_free (ho_ctx_index);
-      return cb_fn (ho_ctx->parent_app_index, ho_ctx->c_s_index, 0,
-		    1 /* failed */ );
-    }
-
-  ctx_index = tls_ctx_alloc ();
-  ctx = tls_ctx_get (ctx_index);
-  clib_memcpy (ctx, ho_ctx, sizeof (*ctx));
-  tls_ctx_half_open_reader_unlock ();
-  tls_ctx_half_open_free (ho_ctx_index);
-
-  ctx->c_thread_index = vlib_get_thread_index ();
-  ctx->tls_ctx_idx = ctx_index;
-
-  TLS_DBG (1, "TCP connect for %u returned %u. New connection [%u]%u",
-	   ho_ctx_index, is_fail, vlib_get_thread_index (),
-	   (ctx) ? ctx_index : ~0);
-
-  ctx->tls_session_handle = session_handle (tls_session);
-  tls_session->opaque = ctx_index;
-  tls_session->session_state = SESSION_STATE_READY;
-
-  return tls_ctx_init_client (ctx);
-}
-
-/* *INDENT-OFF* */
-static session_cb_vft_t tls_app_cb_vft = {
-  .session_accept_callback = tls_session_accept_callback,
-  .session_disconnect_callback = tls_session_disconnect_callback,
-  .session_connected_callback = tls_session_connected_callback,
-  .session_reset_callback = tls_session_reset_callback,
-  .add_segment_callback = tls_add_segment_callback,
-  .del_segment_callback = tls_del_segment_callback,
-  .builtin_app_rx_callback = tls_app_rx_callback,
-  .builtin_app_tx_callback = tls_app_tx_callback,
-};
-/* *INDENT-ON* */
-
-int
-tls_connect (transport_endpoint_t * tep)
-{
-  session_endpoint_extended_t *sep;
-  session_endpoint_t tls_sep;
-  tls_main_t *tm = &tls_main;
-  application_t *app;
-  tls_ctx_t *ctx;
-  u32 ctx_index;
-  int rv;
-
-  sep = (session_endpoint_extended_t *) tep;
-
-  ctx_index = tls_ctx_half_open_alloc ();
-  ctx = tls_ctx_half_open_get (ctx_index);
-  ctx->parent_app_index = sep->app_index;
-  ctx->parent_app_api_context = sep->opaque;
-  ctx->tcp_is_ip4 = sep->is_ip4;
-  if (sep->hostname)
-    {
-      ctx->srv_hostname = format (0, "%v", sep->hostname);
-      vec_terminate_c_string (ctx->srv_hostname);
-    }
-  tls_ctx_half_open_reader_unlock ();
-
-  app = application_get (sep->app_index);
-  application_alloc_connects_segment_manager (app);
-
-  clib_memcpy (&tls_sep, sep, sizeof (tls_sep));
-  tls_sep.transport_proto = TRANSPORT_PROTO_TCP;
-  if ((rv = application_connect (tm->app_index, ctx_index, &tls_sep)))
-    return rv;
-
-  TLS_DBG (1, "New connect request %u", ctx_index);
-  return 0;
-}
-
-void
-tls_disconnect (u32 ctx_index, u32 thread_index)
-{
-  stream_session_t *tls_session, *app_session;
-  tls_ctx_t *ctx;
-
-  TLS_DBG (1, "Disconnecting %u", ctx_index);
-
-  ctx = tls_ctx_get (ctx_index);
-  if (ctx->ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER && !ctx->is_passive_close)
-    mbedtls_ssl_close_notify (&ctx->ssl);
-
-  tls_session = session_get_from_handle (ctx->tls_session_handle);
-  stream_session_disconnect (tls_session);
-
-  app_session = session_get_from_handle_if_valid (ctx->app_session_handle);
-  if (app_session)
-    {
-      segment_manager_dealloc_fifos (app_session->svm_segment_index,
-				     app_session->server_rx_fifo,
-				     app_session->server_tx_fifo);
-      session_free (app_session);
-    }
-  if (ctx->ssl.conf->endpoint == MBEDTLS_SSL_IS_SERVER)
-    {
-      mbedtls_x509_crt_free (&ctx->srvcert);
-      mbedtls_pk_free (&ctx->pkey);
-    }
-  mbedtls_ssl_free (&ctx->ssl);
-  mbedtls_ssl_config_free (&ctx->conf);
-  tls_ctx_free (ctx);
-}
-
-u32
-tls_start_listen (u32 app_listener_index, transport_endpoint_t * tep)
-{
-  tls_main_t *tm = &tls_main;
-  application_t *tls_app;
-  session_handle_t tls_handle;
-  session_endpoint_extended_t *sep;
-  stream_session_t *tls_listener;
-  tls_ctx_t *lctx;
-  u32 lctx_index;
-  session_type_t st;
-  stream_session_t *app_listener;
-
-  sep = (session_endpoint_extended_t *) tep;
-  lctx_index = tls_listener_ctx_alloc ();
-  lctx = tls_listener_ctx_get (lctx_index);
-  st = session_type_from_proto_and_ip (sep->transport_proto, sep->is_ip4);
-  app_listener = listen_session_get (st, app_listener_index);
-
-  tls_app = application_get (tm->app_index);
-  sep->transport_proto = TRANSPORT_PROTO_TCP;
-  if (application_start_listen (tls_app, (session_endpoint_t *) sep,
-				&tls_handle))
-    return ~0;
-
-  tls_listener = listen_session_get_from_handle (tls_handle);
-  tls_listener->opaque = lctx_index;
-  lctx->parent_app_index = sep->app_index;
-  lctx->tls_session_handle = tls_handle;
-  lctx->app_session_handle = listen_session_get_handle (app_listener);
-  lctx->tcp_is_ip4 = sep->is_ip4;
-  return lctx_index;
-}
-
-u32
-tls_stop_listen (u32 lctx_index)
-{
-  tls_main_t *tm = &tls_main;
-  application_t *tls_app;
-  tls_ctx_t *lctx;
-  lctx = tls_listener_ctx_get (lctx_index);
-  tls_app = application_get (tm->app_index);
-  application_stop_listen (tls_app, lctx->tls_session_handle);
-  tls_listener_ctx_free (lctx);
-  return 0;
-}
-
-transport_connection_t *
-tls_connection_get (u32 ctx_index, u32 thread_index)
-{
-  tls_ctx_t *ctx;
-  ctx = tls_ctx_get_w_thread (ctx_index, thread_index);
-  return &ctx->connection;
-}
-
-transport_connection_t *
-tls_listener_get (u32 listener_index)
-{
-  tls_ctx_t *ctx;
-  ctx = tls_listener_ctx_get (listener_index);
-  return &ctx->connection;
-}
-
-u8 *
-format_tls_ctx (u8 * s, va_list * args)
-{
-  tls_ctx_t *ctx = va_arg (*args, tls_ctx_t *);
-  u32 thread_index = va_arg (*args, u32);
-  u32 child_si, child_ti;
-
-  session_parse_handle (ctx->tls_session_handle, &child_si, &child_ti);
-  if (thread_index != child_ti)
-    clib_warning ("app and tls sessions are on different threads!");
-
-  s = format (s, "[#%d][TLS] app %u child %u", child_ti,
-	      ctx->parent_app_index, child_si);
-  return s;
-}
-
-u8 *
-format_tls_connection (u8 * s, va_list * args)
-{
-  u32 ctx_index = va_arg (*args, u32);
-  u32 thread_index = va_arg (*args, u32);
-  u32 verbose = va_arg (*args, u32);
-  tls_ctx_t *ctx;
-
-  ctx = tls_ctx_get_w_thread (ctx_index, thread_index);
-  if (!ctx)
-    return s;
-
-  s = format (s, "%-50U", format_tls_ctx, ctx, thread_index);
-  if (verbose)
-    {
-      s = format (s, "%-15s", "state");
-      if (verbose > 1)
-	s = format (s, "\n");
-    }
-  return s;
-}
-
-u8 *
-format_tls_listener (u8 * s, va_list * args)
-{
-  u32 tc_index = va_arg (*args, u32);
-  tls_ctx_t *ctx = tls_listener_ctx_get (tc_index);
-  u32 listener_index, type;
-
-  listen_session_parse_handle (ctx->tls_session_handle, &type,
-			       &listener_index);
-  return format (s, "[TLS] listener app %u child %u", ctx->parent_app_index,
-		 listener_index);
-}
-
-u8 *
-format_tls_half_open (u8 * s, va_list * args)
-{
-  u32 tc_index = va_arg (*args, u32);
-  tls_ctx_t *ctx = tls_ctx_half_open_get (tc_index);
-  s = format (s, "[TLS] half-open app %u", ctx->parent_app_index);
-  tls_ctx_half_open_reader_unlock ();
-  return s;
-}
-
-/* *INDENT-OFF* */
-const static transport_proto_vft_t tls_proto = {
-  .open = tls_connect,
-  .close = tls_disconnect,
-  .bind = tls_start_listen,
-  .get_connection = tls_connection_get,
-  .get_listener = tls_listener_get,
-  .unbind = tls_stop_listen,
-  .tx_type = TRANSPORT_TX_INTERNAL,
-  .service_type = TRANSPORT_SERVICE_APP,
-  .format_connection = format_tls_connection,
-  .format_half_open = format_tls_half_open,
-  .format_listener = format_tls_listener,
-};
-/* *INDENT-ON* */
-
-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;
-}
-
-int
-tls_init_ca_chain (void)
-{
-  tls_main_t *tm = &tls_main;
-  int rv;
-
-  if (!tm->ca_cert_path)
-    tm->ca_cert_path = TLS_CA_CERT_PATH;
-
-  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 (&tm->cacert);
-  rv = mbedtls_x509_crt_parse_file (&tm->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 (&tm->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);
-}
-
-clib_error_t *
-tls_init (vlib_main_t * vm)
-{
-  vlib_thread_main_t *vtm = vlib_get_thread_main ();
-  u32 fifo_size = 64 << 10, num_threads;
-  vnet_app_attach_args_t _a, *a = &_a;
-  u64 options[APP_OPTIONS_N_OPTIONS];
-  u32 segment_size = 512 << 20;
-  tls_main_t *tm = &tls_main;
-
-  num_threads = 1 /* main thread */  + vtm->n_threads;
-
-  if (tls_init_mem ())
-    {
-      clib_warning ("failed to initialize mem");
-      return clib_error_return (0, "failed to initalize mem");
-    }
-  if (tls_init_ca_chain ())
-    {
-      clib_warning ("failed to initialize TLS CA chain");
-      return clib_error_return (0, "failed to initalize TLS CA chain");
-    }
-  if (tls_init_ctr_drbgs_and_entropy (num_threads))
-    {
-      clib_warning ("failed to initialize entropy and random generators");
-      return clib_error_return (0, "failed to initialize entropy and random "
-				"generators");
-    }
-
-  memset (a, 0, sizeof (*a));
-  memset (options, 0, sizeof (options));
-
-  a->session_cb_vft = &tls_app_cb_vft;
-  a->api_client_index = (1 << 24) + 1;
-  a->options = options;
-  a->options[APP_OPTIONS_SEGMENT_SIZE] = segment_size;
-  a->options[APP_OPTIONS_RX_FIFO_SIZE] = fifo_size;
-  a->options[APP_OPTIONS_TX_FIFO_SIZE] = fifo_size;
-  a->options[APP_OPTIONS_FLAGS] = APP_OPTIONS_FLAGS_IS_BUILTIN;
-  a->options[APP_OPTIONS_FLAGS] |= APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE;
-
-  if (vnet_application_attach (a))
-    {
-      clib_warning ("failed to attach tls app");
-      return clib_error_return (0, "failed to attach tls app");
-    }
-
-  tm->app_index = a->app_index;
-  vec_validate (tm->ctx_pool, num_threads - 1);
-  clib_rwlock_init (&tm->half_open_rwlock);
-
-  transport_register_protocol (TRANSPORT_PROTO_TLS, &tls_proto,
-			       FIB_PROTOCOL_IP4, ~0);
-  transport_register_protocol (TRANSPORT_PROTO_TLS, &tls_proto,
-			       FIB_PROTOCOL_IP6, ~0);
-
-  return 0;
-}
-
-VLIB_INIT_FUNCTION (tls_init);
-
-static clib_error_t *
-tls_config_fn (vlib_main_t * vm, unformat_input_t * input)
-{
-  tls_main_t *tm = &tls_main;
-  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
-    {
-      if (unformat (input, "use-test-cert-in-ca"))
-	tm->use_test_cert_in_ca = 1;
-      else if (unformat (input, "ca-cert-path %s", &tm->ca_cert_path))
-	;
-      else
-	return clib_error_return (0, "unknown input `%U'",
-				  format_unformat_error, input);
-    }
-  return 0;
-}
-
-VLIB_EARLY_CONFIG_FUNCTION (tls_config_fn, "tls");
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */