Пример #1
0
static void different_SNI_at_ssl(WOLFSSL* ssl)
{
    byte type = WOLFSSL_SNI_HOST_NAME;
    char name[] = "ww2.yassl.com";

    AssertIntEQ(SSL_SUCCESS,
                wolfSSL_UseSNI(ssl, type, (void *) name, XSTRLEN(name)));
}
Пример #2
0
int
lws_client_socket_service(struct lws_context *context, struct lws *wsi,
			  struct lws_pollfd *pollfd)
{
	struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
	char *p = (char *)&pt->serv_buf[0];
	char *sb = p;
	unsigned char c;
	int n, len;

	switch (wsi->mode) {

	case LWSCM_WSCL_WAITING_CONNECT:

		/*
		 * we are under PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE
		 * timeout protection set in client-handshake.c
		 */

		if (!lws_client_connect_2(wsi)) {
			/* closed */
			lwsl_client("closed\n");
			return -1;
		}

		/* either still pending connection, or changed mode */
		return 0;

	case LWSCM_WSCL_WAITING_PROXY_REPLY:

		/* handle proxy hung up on us */

		if (pollfd->revents & LWS_POLLHUP) {

			lwsl_warn("Proxy connection %p (fd=%d) dead\n",
				  (void *)wsi, pollfd->fd);

			lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
			return 0;
		}

		n = recv(wsi->sock, sb, LWS_MAX_SOCKET_IO_BUF, 0);
		if (n < 0) {
			if (LWS_ERRNO == LWS_EAGAIN) {
				lwsl_debug("Proxy read returned EAGAIN... retrying\n");
				return 0;
			}

			lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
			lwsl_err("ERROR reading from proxy socket\n");
			return 0;
		}

		pt->serv_buf[13] = '\0';
		if (strcmp(sb, "HTTP/1.0 200 ") &&
		    strcmp(sb, "HTTP/1.1 200 ")) {
			lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
			lwsl_err("ERROR proxy: %s\n", sb);
			return 0;
		}

		/* clear his proxy connection timeout */

		lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);

		/* fallthru */

	case LWSCM_WSCL_ISSUE_HANDSHAKE:

		/*
		 * we are under PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE
		 * timeout protection set in client-handshake.c
		 *
		 * take care of our lws_callback_on_writable
		 * happening at a time when there's no real connection yet
		 */
		if (lws_change_pollfd(wsi, LWS_POLLOUT, 0))
			return -1;
		lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_WRITE);

#ifdef LWS_OPENSSL_SUPPORT
		/* we can retry this... just cook the SSL BIO the first time */

		if (wsi->use_ssl && !wsi->ssl) {
#if defined(CYASSL_SNI_HOST_NAME) || defined(WOLFSSL_SNI_HOST_NAME) || defined(SSL_CTRL_SET_TLSEXT_HOSTNAME)
			const char *hostname = lws_hdr_simple_ptr(wsi,
						_WSI_TOKEN_CLIENT_HOST);
#endif

			wsi->ssl = SSL_new(context->ssl_client_ctx);
#ifndef USE_WOLFSSL
			SSL_set_mode(wsi->ssl,
					SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
#endif
			/*
			 * use server name indication (SNI), if supported,
			 * when establishing connection
			 */
#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
#ifdef CYASSL_SNI_HOST_NAME
			CyaSSL_UseSNI(wsi->ssl, CYASSL_SNI_HOST_NAME,
				hostname, strlen(hostname));
#endif
#else
#ifdef WOLFSSL_SNI_HOST_NAME
			wolfSSL_UseSNI(wsi->ssl, WOLFSSL_SNI_HOST_NAME,
				hostname, strlen(hostname));
#endif
#endif
#else
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
			SSL_set_tlsext_host_name(wsi->ssl, hostname);
#endif
#endif

#ifdef USE_WOLFSSL
			/*
			 * wolfSSL/CyaSSL does certificate verification differently
			 * from OpenSSL.
			 * If we should ignore the certificate, we need to set
			 * this before SSL_new and SSL_connect is called.
			 * Otherwise the connect will simply fail with error
			 * code -155
			 */
#ifdef USE_OLD_CYASSL
			if (wsi->use_ssl == 2)
				CyaSSL_set_verify(wsi->ssl,
							SSL_VERIFY_NONE, NULL);
#else
			if (wsi->use_ssl == 2)
				wolfSSL_set_verify(wsi->ssl,
							SSL_VERIFY_NONE, NULL);
#endif
#endif /* USE_WOLFSSL */

			wsi->client_bio =
				BIO_new_socket(wsi->sock, BIO_NOCLOSE);
			SSL_set_bio(wsi->ssl, wsi->client_bio, wsi->client_bio);

#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
			CyaSSL_set_using_nonblock(wsi->ssl, 1);
#else
			wolfSSL_set_using_nonblock(wsi->ssl, 1);
#endif
#else
			BIO_set_nbio(wsi->client_bio, 1); /* nonblocking */
#endif

			SSL_set_ex_data(wsi->ssl,
					openssl_websocket_private_data_index,
								       context);
		}

		if (wsi->use_ssl) {
			lws_latency_pre(context, wsi);
			n = SSL_connect(wsi->ssl);
			lws_latency(context, wsi,
			  "SSL_connect LWSCM_WSCL_ISSUE_HANDSHAKE", n, n > 0);

			if (n < 0) {
				n = SSL_get_error(wsi->ssl, n);

				if (n == SSL_ERROR_WANT_READ)
					goto some_wait;

				if (n == SSL_ERROR_WANT_WRITE) {
					/*
					 * wants us to retry connect due to
					 * state of the underlying ssl layer...
					 * but since it may be stalled on
					 * blocked write, no incoming data may
					 * arrive to trigger the retry.
					 * Force (possibly many times if the SSL
					 * state persists in returning the
					 * condition code, but other sockets
					 * are getting serviced inbetweentimes)
					 * us to get called back when writable.
					 */
					lwsl_info("%s: WANT_WRITE... retrying\n", __func__);
					lws_callback_on_writable(wsi);
some_wait:
					wsi->mode = LWSCM_WSCL_WAITING_SSL;

					return 0; /* no error */
				}
				n = -1;
			}

			if (n <= 0) {
				/*
				 * retry if new data comes until we
				 * run into the connection timeout or win
				 */
				n = ERR_get_error();
				if (n != SSL_ERROR_NONE) {
					lwsl_err("SSL connect error %lu: %s\n",
						n, ERR_error_string(n, sb));
					return 0;
				}
			}
		} else
			wsi->ssl = NULL;

		/* fallthru */

	case LWSCM_WSCL_WAITING_SSL:

		if (wsi->use_ssl) {
			if (wsi->mode == LWSCM_WSCL_WAITING_SSL) {
				lws_latency_pre(context, wsi);
				n = SSL_connect(wsi->ssl);
				lws_latency(context, wsi,
					    "SSL_connect LWSCM_WSCL_WAITING_SSL",
					    n, n > 0);

				if (n < 0) {
					n = SSL_get_error(wsi->ssl, n);

					if (n == SSL_ERROR_WANT_READ)
						goto some_wait;

					if (n == SSL_ERROR_WANT_WRITE) {
						/*
						 * wants us to retry connect due to
						 * state of the underlying ssl layer...
						 * but since it may be stalled on
						 * blocked write, no incoming data may
						 * arrive to trigger the retry.
						 * Force (possibly many times if the SSL
						 * state persists in returning the
						 * condition code, but other sockets
						 * are getting serviced inbetweentimes)
						 * us to get called back when writable.
						 */
						lwsl_info("SSL_connect WANT_WRITE... retrying\n");
						lws_callback_on_writable(wsi);

						goto some_wait;
					}
					n = -1;
				}

				if (n <= 0) {
					/*
					 * retry if new data comes until we
					 * run into the connection timeout or win
					 */
					n = ERR_get_error();
					if (n != SSL_ERROR_NONE) {
						lwsl_err("SSL connect error %lu: %s\n",
							 n, ERR_error_string(n, sb));
						return 0;
					}
				}
			}

			#ifndef USE_WOLFSSL
			/*
			 * See comment above about wolfSSL certificate
			 * verification
			 */
			lws_latency_pre(context, wsi);
			n = SSL_get_verify_result(wsi->ssl);
			lws_latency(context, wsi,
				"SSL_get_verify_result LWS_CONNMODE..HANDSHAKE",
								      n, n > 0);

			if (n != X509_V_OK) {
				if ((n == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT ||
				     n == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN) && wsi->use_ssl == 2) {
					lwsl_notice("accepting self-signed certificate\n");
				} else {
					lwsl_err("server's cert didn't look good, X509_V_ERR = %d: %s\n",
						 n, ERR_error_string(n, sb));
					lws_close_free_wsi(wsi,
						LWS_CLOSE_STATUS_NOSTATUS);
					return 0;
				}
			}
#endif /* USE_WOLFSSL */
		} else
			wsi->ssl = NULL;
#endif

		wsi->mode = LWSCM_WSCL_ISSUE_HANDSHAKE2;
		lws_set_timeout(wsi, PENDING_TIMEOUT_AWAITING_CLIENT_HS_SEND,
				AWAITING_TIMEOUT);

		/* fallthru */

	case LWSCM_WSCL_ISSUE_HANDSHAKE2:
		p = lws_generate_client_handshake(wsi, p);
		if (p == NULL) {
			lwsl_err("Failed to generate handshake for client\n");
			lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
			return 0;
		}

		/* send our request to the server */

		lws_latency_pre(context, wsi);

		n = lws_ssl_capable_write(wsi, (unsigned char *)sb, p - sb);
		lws_latency(context, wsi, "send lws_issue_raw", n,
			    n == p - sb);
		switch (n) {
		case LWS_SSL_CAPABLE_ERROR:
			lwsl_debug("ERROR writing to client socket\n");
			lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
			return 0;
		case LWS_SSL_CAPABLE_MORE_SERVICE:
			lws_callback_on_writable(wsi);
			break;
		}

		wsi->u.hdr.parser_state = WSI_TOKEN_NAME_PART;
		wsi->u.hdr.lextable_pos = 0;
		wsi->mode = LWSCM_WSCL_WAITING_SERVER_REPLY;
		lws_set_timeout(wsi, PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE,
				AWAITING_TIMEOUT);
		break;

	case LWSCM_WSCL_WAITING_SERVER_REPLY:

		/* handle server hung up on us */

		if (pollfd->revents & LWS_POLLHUP) {

			lwsl_debug("Server connection %p (fd=%d) dead\n",
				(void *)wsi, pollfd->fd);

			goto bail3;
		}

		if (!(pollfd->revents & LWS_POLLIN))
			break;

		/* interpret the server response */

		/*
		 *  HTTP/1.1 101 Switching Protocols
		 *  Upgrade: websocket
		 *  Connection: Upgrade
		 *  Sec-WebSocket-Accept: me89jWimTRKTWwrS3aRrL53YZSo=
		 *  Sec-WebSocket-Nonce: AQIDBAUGBwgJCgsMDQ4PEC==
		 *  Sec-WebSocket-Protocol: chat
		 */

		/*
		 * we have to take some care here to only take from the
		 * socket bytewise.  The browser may (and has been seen to
		 * in the case that onopen() performs websocket traffic)
		 * coalesce both handshake response and websocket traffic
		 * in one packet, since at that point the connection is
		 * definitively ready from browser pov.
		 */
		len = 1;
		while (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE &&
		       len > 0) {
			n = lws_ssl_capable_read(wsi, &c, 1);
			lws_latency(context, wsi, "send lws_issue_raw", n,
				    n == 1);
			switch (n) {
			case 0:
			case LWS_SSL_CAPABLE_ERROR:
				goto bail3;
			case LWS_SSL_CAPABLE_MORE_SERVICE:
				return 0;
			}

			if (lws_parse(wsi, c)) {
				lwsl_warn("problems parsing header\n");
				goto bail3;
			}
		}

		/*
		 * hs may also be coming in multiple packets, there is a 5-sec
		 * libwebsocket timeout still active here too, so if parsing did
		 * not complete just wait for next packet coming in this state
		 */

		if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE)
			break;

		/*
		 * otherwise deal with the handshake.  If there's any
		 * packet traffic already arrived we'll trigger poll() again
		 * right away and deal with it that way
		 */

		return lws_client_interpret_server_handshake(wsi);

bail3:
		lwsl_info("closing conn at LWS_CONNMODE...SERVER_REPLY\n");
		lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
		return -1;

	case LWSCM_WSCL_WAITING_EXTENSION_CONNECT:
		lwsl_ext("LWSCM_WSCL_WAITING_EXTENSION_CONNECT\n");
		break;

	case LWSCM_WSCL_PENDING_CANDIDATE_CHILD:
		lwsl_ext("LWSCM_WSCL_PENDING_CANDIDATE_CHILD\n");
		break;
	default:
		break;
	}

	return 0;
}
Пример #3
0
int
lws_ssl_client_bio_create(struct lws *wsi)
{
#if defined(LWS_USE_POLARSSL)
	return 0;
#else
#if defined(LWS_USE_MBEDTLS)
#else
	struct lws_context *context = wsi->context;
	const char *hostname = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_HOST);
	X509_VERIFY_PARAM *param;

	(void)hostname;
	(void)param;

	wsi->ssl = SSL_new(wsi->vhost->ssl_client_ctx);

#if defined LWS_HAVE_X509_VERIFY_PARAM_set1_host
	if (!(wsi->use_ssl & LCCSCF_SKIP_SERVER_CERT_HOSTNAME_CHECK)) {
		param = SSL_get0_param(wsi->ssl);
		/* Enable automatic hostname checks */
		X509_VERIFY_PARAM_set_hostflags(param,
						X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS);
		X509_VERIFY_PARAM_set1_host(param, hostname, 0);
		/* Configure a non-zero callback if desired */
		SSL_set_verify(wsi->ssl, SSL_VERIFY_PEER, 0);
	}
#endif

#ifndef USE_WOLFSSL
	SSL_set_mode(wsi->ssl,  SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
#endif
	/*
	 * use server name indication (SNI), if supported,
	 * when establishing connection
	 */
#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
#ifdef CYASSL_SNI_HOST_NAME
	CyaSSL_UseSNI(wsi->ssl, CYASSL_SNI_HOST_NAME, hostname, strlen(hostname));
#endif
#else
#ifdef WOLFSSL_SNI_HOST_NAME
	wolfSSL_UseSNI(wsi->ssl, WOLFSSL_SNI_HOST_NAME, hostname, strlen(hostname));
#endif
#endif
#else
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
	SSL_set_tlsext_host_name(wsi->ssl, hostname);
#endif
#endif

#ifdef USE_WOLFSSL
	/*
	 * wolfSSL/CyaSSL does certificate verification differently
	 * from OpenSSL.
	 * If we should ignore the certificate, we need to set
	 * this before SSL_new and SSL_connect is called.
	 * Otherwise the connect will simply fail with error code -155
	 */
#ifdef USE_OLD_CYASSL
	if (wsi->use_ssl == 2)
		CyaSSL_set_verify(wsi->ssl, SSL_VERIFY_NONE, NULL);
#else
	if (wsi->use_ssl == 2)
		wolfSSL_set_verify(wsi->ssl, SSL_VERIFY_NONE, NULL);
#endif
#endif /* USE_WOLFSSL */

	wsi->client_bio = BIO_new_socket(wsi->sock, BIO_NOCLOSE);
	SSL_set_bio(wsi->ssl, wsi->client_bio, wsi->client_bio);

#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
	CyaSSL_set_using_nonblock(wsi->ssl, 1);
#else
	wolfSSL_set_using_nonblock(wsi->ssl, 1);
#endif
#else
	BIO_set_nbio(wsi->client_bio, 1); /* nonblocking */
#endif

	SSL_set_ex_data(wsi->ssl, openssl_websocket_private_data_index,
			context);

	return 0;
#endif
#endif
}
Пример #4
0
static void different_SNI_at_ssl(WOLFSSL* ssl)
{
    AssertIntEQ(SSL_SUCCESS,
             wolfSSL_UseSNI(ssl, WOLFSSL_SNI_HOST_NAME, "ww2.wolfssl.com", 15));
}
Пример #5
0
static void test_wolfSSL_UseSNI(void)
{
#ifdef HAVE_SNI
    callback_functions client_callbacks = {wolfSSLv23_client_method, 0, 0, 0};
    callback_functions server_callbacks = {wolfSSLv23_server_method, 0, 0, 0};

    WOLFSSL_CTX *ctx = wolfSSL_CTX_new(wolfSSLv23_client_method());
    WOLFSSL     *ssl = wolfSSL_new(ctx);

    AssertNotNull(ctx);
    AssertNotNull(ssl);

    /* error cases */
    AssertIntNE(SSL_SUCCESS,
                wolfSSL_CTX_UseSNI(NULL, 0, (void *) "ctx", XSTRLEN("ctx")));
    AssertIntNE(SSL_SUCCESS,
                wolfSSL_UseSNI(    NULL, 0, (void *) "ssl", XSTRLEN("ssl")));
    AssertIntNE(SSL_SUCCESS,
                wolfSSL_CTX_UseSNI(ctx, -1, (void *) "ctx", XSTRLEN("ctx")));
    AssertIntNE(SSL_SUCCESS,
                wolfSSL_UseSNI(    ssl, -1, (void *) "ssl", XSTRLEN("ssl")));
    AssertIntNE(SSL_SUCCESS,
                wolfSSL_CTX_UseSNI(ctx,  0, (void *) NULL,  XSTRLEN("ctx")));
    AssertIntNE(SSL_SUCCESS,
                wolfSSL_UseSNI(    ssl,  0, (void *) NULL,  XSTRLEN("ssl")));

    /* success case */
    AssertIntEQ(SSL_SUCCESS,
                wolfSSL_CTX_UseSNI(ctx,  0, (void *) "ctx", XSTRLEN("ctx")));
    AssertIntEQ(SSL_SUCCESS,
                wolfSSL_UseSNI(    ssl,  0, (void *) "ssl", XSTRLEN("ssl")));

    wolfSSL_free(ssl);
    wolfSSL_CTX_free(ctx);

    /* Testing success case at ctx */
    client_callbacks.ctx_ready = server_callbacks.ctx_ready = use_SNI_at_ctx;
    server_callbacks.on_result = verify_SNI_real_matching;

    test_wolfSSL_client_server(&client_callbacks, &server_callbacks);

    /* Testing success case at ssl */
    client_callbacks.ctx_ready = server_callbacks.ctx_ready = NULL;
    client_callbacks.ssl_ready = server_callbacks.ssl_ready = use_SNI_at_ssl;

    test_wolfSSL_client_server(&client_callbacks, &server_callbacks);

    /* Testing default mismatch behaviour */
    client_callbacks.ssl_ready = different_SNI_at_ssl;
    client_callbacks.on_result = verify_SNI_abort_on_client;
    server_callbacks.on_result = verify_SNI_abort_on_server;

    test_wolfSSL_client_server(&client_callbacks, &server_callbacks);
    client_callbacks.on_result = NULL;

    /* Testing continue on mismatch */
    client_callbacks.ssl_ready = different_SNI_at_ssl;
    server_callbacks.ssl_ready = use_SNI_WITH_CONTINUE_at_ssl;
    server_callbacks.on_result = verify_SNI_no_matching;

    test_wolfSSL_client_server(&client_callbacks, &server_callbacks);

    /* Testing fake answer on mismatch */
    server_callbacks.ssl_ready = use_SNI_WITH_FAKE_ANSWER_at_ssl;
    server_callbacks.on_result = verify_SNI_fake_matching;

    test_wolfSSL_client_server(&client_callbacks, &server_callbacks);

    test_wolfSSL_SNI_GetFromBuffer();
#endif
}
Пример #6
0
int
lws_ssl_client_bio_create(struct lws *wsi)
{
	struct lws_context *context = wsi->context;
#if defined(CYASSL_SNI_HOST_NAME) || defined(WOLFSSL_SNI_HOST_NAME) || defined(SSL_CTRL_SET_TLSEXT_HOSTNAME)
	const char *hostname = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_HOST);
#endif

	wsi->ssl = SSL_new(wsi->vhost->ssl_client_ctx);
#ifndef USE_WOLFSSL
	SSL_set_mode(wsi->ssl,  SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
#endif
	/*
	 * use server name indication (SNI), if supported,
	 * when establishing connection
	 */
#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
#ifdef CYASSL_SNI_HOST_NAME
	CyaSSL_UseSNI(wsi->ssl, CYASSL_SNI_HOST_NAME, hostname, strlen(hostname));
#endif
#else
#ifdef WOLFSSL_SNI_HOST_NAME
	wolfSSL_UseSNI(wsi->ssl, WOLFSSL_SNI_HOST_NAME, hostname, strlen(hostname));
#endif
#endif
#else
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
	SSL_set_tlsext_host_name(wsi->ssl, hostname);
#endif
#endif

#ifdef USE_WOLFSSL
	/*
	 * wolfSSL/CyaSSL does certificate verification differently
	 * from OpenSSL.
	 * If we should ignore the certificate, we need to set
	 * this before SSL_new and SSL_connect is called.
	 * Otherwise the connect will simply fail with error code -155
	 */
#ifdef USE_OLD_CYASSL
	if (wsi->use_ssl == 2)
		CyaSSL_set_verify(wsi->ssl, SSL_VERIFY_NONE, NULL);
#else
	if (wsi->use_ssl == 2)
		wolfSSL_set_verify(wsi->ssl, SSL_VERIFY_NONE, NULL);
#endif
#endif /* USE_WOLFSSL */

	wsi->client_bio = BIO_new_socket(wsi->sock, BIO_NOCLOSE);
	SSL_set_bio(wsi->ssl, wsi->client_bio, wsi->client_bio);

#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
	CyaSSL_set_using_nonblock(wsi->ssl, 1);
#else
	wolfSSL_set_using_nonblock(wsi->ssl, 1);
#endif
#else
	BIO_set_nbio(wsi->client_bio, 1); /* nonblocking */
#endif

	SSL_set_ex_data(wsi->ssl, openssl_websocket_private_data_index,
			context);

	return 0;
}
Пример #7
-1
static void test_wolfSSL_UseSNI_params(void)
{
    WOLFSSL_CTX *ctx = wolfSSL_CTX_new(wolfSSLv23_client_method());
    WOLFSSL     *ssl = wolfSSL_new(ctx);

    AssertNotNull(ctx);
    AssertNotNull(ssl);

    /* invalid [ctx|ssl] */
    AssertIntNE(SSL_SUCCESS, wolfSSL_CTX_UseSNI(NULL, 0, "ctx", 3));
    AssertIntNE(SSL_SUCCESS, wolfSSL_UseSNI(    NULL, 0, "ssl", 3));
    /* invalid type */
    AssertIntNE(SSL_SUCCESS, wolfSSL_CTX_UseSNI(ctx, -1, "ctx", 3));
    AssertIntNE(SSL_SUCCESS, wolfSSL_UseSNI(    ssl, -1, "ssl", 3));
    /* invalid data */
    AssertIntNE(SSL_SUCCESS, wolfSSL_CTX_UseSNI(ctx,  0, NULL,  3));
    AssertIntNE(SSL_SUCCESS, wolfSSL_UseSNI(    ssl,  0, NULL,  3));
    /* success case */
    AssertIntEQ(SSL_SUCCESS, wolfSSL_CTX_UseSNI(ctx,  0, "ctx", 3));
    AssertIntEQ(SSL_SUCCESS, wolfSSL_UseSNI(    ssl,  0, "ssl", 3));

    wolfSSL_free(ssl);
    wolfSSL_CTX_free(ctx);
}