Update libwebsockets to 3.1 (plus UWP patch)

1 files changed, 509 insertions, 0 deletions

diff --git a/thirdparty/libwebsockets/lib/tls/mbedtls/ssl.c b/thirdparty/libwebsockets/lib/tls/mbedtls/ssl.c
new file mode 100644
index 0000000000..b81f88862b
--- /dev/null
+++ b/thirdparty/libwebsockets/lib/tls/mbedtls/ssl.c
@@ -0,0 +1,509 @@
+/*
+ * libwebsockets - mbedTLS-specific lws apis
+ *
+ * Copyright (C) 2010-2017 Andy Green <andy@warmcat.com>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation:
+ *  version 2.1 of the License.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ *  MA  02110-1301  USA
+ */
+
+#include "core/private.h"
+#include <mbedtls/oid.h>
+
+void
+lws_ssl_elaborate_error(void)
+{
+}
+
+int
+lws_context_init_ssl_library(const struct lws_context_creation_info *info)
+{
+	lwsl_info(" Compiled with MbedTLS support\n");
+
+	if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT))
+		lwsl_info(" SSL disabled: no "
+			  "LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT\n");
+
+	return 0;
+}
+
+LWS_VISIBLE void
+lws_ssl_destroy(struct lws_vhost *vhost)
+{
+	if (!lws_check_opt(vhost->context->options,
+			   LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT))
+		return;
+
+	if (vhost->tls.ssl_ctx)
+		SSL_CTX_free(vhost->tls.ssl_ctx);
+	if (!vhost->tls.user_supplied_ssl_ctx && vhost->tls.ssl_client_ctx)
+		SSL_CTX_free(vhost->tls.ssl_client_ctx);
+
+	if (vhost->tls.x509_client_CA)
+		X509_free(vhost->tls.x509_client_CA);
+}
+
+LWS_VISIBLE int
+lws_ssl_capable_read(struct lws *wsi, unsigned char *buf, int len)
+{
+	struct lws_context *context = wsi->context;
+	struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
+	int n = 0, m;
+
+	if (!wsi->tls.ssl)
+		return lws_ssl_capable_read_no_ssl(wsi, buf, len);
+
+	lws_stats_atomic_bump(context, pt, LWSSTATS_C_API_READ, 1);
+
+	errno = 0;
+	n = SSL_read(wsi->tls.ssl, buf, len);
+#if defined(LWS_WITH_ESP32)
+	if (!n && errno == LWS_ENOTCONN) {
+		lwsl_debug("%p: SSL_read ENOTCONN\n", wsi);
+		return LWS_SSL_CAPABLE_ERROR;
+	}
+#endif
+#if defined(LWS_WITH_STATS)
+	if (!wsi->seen_rx && wsi->accept_start_us) {
+                lws_stats_atomic_bump(wsi->context, pt,
+                		      LWSSTATS_MS_SSL_RX_DELAY,
+				lws_time_in_microseconds() -
+				wsi->accept_start_us);
+                lws_stats_atomic_bump(wsi->context, pt,
+                		      LWSSTATS_C_SSL_CONNS_HAD_RX, 1);
+		wsi->seen_rx = 1;
+	}
+#endif
+
+
+	lwsl_debug("%p: SSL_read says %d\n", wsi, n);
+	/* manpage: returning 0 means connection shut down */
+	if (!n) {
+		wsi->socket_is_permanently_unusable = 1;
+
+		return LWS_SSL_CAPABLE_ERROR;
+	}
+
+	if (n < 0) {
+		m = SSL_get_error(wsi->tls.ssl, n);
+		lwsl_debug("%p: ssl err %d errno %d\n", wsi, m, errno);
+		if (m == SSL_ERROR_ZERO_RETURN ||
+		    m == SSL_ERROR_SYSCALL)
+			return LWS_SSL_CAPABLE_ERROR;
+
+		if (m == SSL_ERROR_WANT_READ || SSL_want_read(wsi->tls.ssl)) {
+			lwsl_debug("%s: WANT_READ\n", __func__);
+			lwsl_debug("%p: LWS_SSL_CAPABLE_MORE_SERVICE\n", wsi);
+			return LWS_SSL_CAPABLE_MORE_SERVICE;
+		}
+		if (m == SSL_ERROR_WANT_WRITE || SSL_want_write(wsi->tls.ssl)) {
+			lwsl_debug("%s: WANT_WRITE\n", __func__);
+			lwsl_debug("%p: LWS_SSL_CAPABLE_MORE_SERVICE\n", wsi);
+			return LWS_SSL_CAPABLE_MORE_SERVICE;
+		}
+		wsi->socket_is_permanently_unusable = 1;
+
+		return LWS_SSL_CAPABLE_ERROR;
+	}
+
+	lws_stats_atomic_bump(context, pt, LWSSTATS_B_READ, n);
+
+	if (wsi->vhost)
+		wsi->vhost->conn_stats.rx += n;
+
+	/*
+	 * if it was our buffer that limited what we read,
+	 * check if SSL has additional data pending inside SSL buffers.
+	 *
+	 * Because these won't signal at the network layer with POLLIN
+	 * and if we don't realize, this data will sit there forever
+	 */
+	if (n != len)
+		goto bail;
+	if (!wsi->tls.ssl)
+		goto bail;
+
+	if (SSL_pending(wsi->tls.ssl) &&
+	    lws_dll_is_null(&wsi->tls.pending_tls_list)) {
+
+		lws_dll_lws_add_front(&wsi->tls.pending_tls_list,
+				      &pt->tls.pending_tls_head);
+	}
+
+	return n;
+bail:
+	lws_ssl_remove_wsi_from_buffered_list(wsi);
+
+	return n;
+}
+
+LWS_VISIBLE int
+lws_ssl_pending(struct lws *wsi)
+{
+	if (!wsi->tls.ssl)
+		return 0;
+
+	return SSL_pending(wsi->tls.ssl);
+}
+
+LWS_VISIBLE int
+lws_ssl_capable_write(struct lws *wsi, unsigned char *buf, int len)
+{
+	int n, m;
+
+	if (!wsi->tls.ssl)
+		return lws_ssl_capable_write_no_ssl(wsi, buf, len);
+
+	n = SSL_write(wsi->tls.ssl, buf, len);
+	if (n > 0)
+		return n;
+
+	m = SSL_get_error(wsi->tls.ssl, n);
+	if (m != SSL_ERROR_SYSCALL) {
+		if (m == SSL_ERROR_WANT_READ || SSL_want_read(wsi->tls.ssl)) {
+			lwsl_notice("%s: want read\n", __func__);
+
+			return LWS_SSL_CAPABLE_MORE_SERVICE;
+		}
+
+		if (m == SSL_ERROR_WANT_WRITE || SSL_want_write(wsi->tls.ssl)) {
+			lws_set_blocking_send(wsi);
+			lwsl_debug("%s: want write\n", __func__);
+
+			return LWS_SSL_CAPABLE_MORE_SERVICE;
+		}
+	}
+
+	lwsl_debug("%s failed: %d\n",__func__, m);
+	wsi->socket_is_permanently_unusable = 1;
+
+	return LWS_SSL_CAPABLE_ERROR;
+}
+
+int openssl_SSL_CTX_private_data_index;
+
+void
+lws_ssl_info_callback(const SSL *ssl, int where, int ret)
+{
+	struct lws *wsi;
+	struct lws_context *context;
+	struct lws_ssl_info si;
+
+	context = (struct lws_context *)SSL_CTX_get_ex_data(
+					SSL_get_SSL_CTX(ssl),
+					openssl_SSL_CTX_private_data_index);
+	if (!context)
+		return;
+	wsi = wsi_from_fd(context, SSL_get_fd(ssl));
+	if (!wsi)
+		return;
+
+	if (!(where & wsi->vhost->tls.ssl_info_event_mask))
+		return;
+
+	si.where = where;
+	si.ret = ret;
+
+	if (user_callback_handle_rxflow(wsi->protocol->callback,
+					wsi, LWS_CALLBACK_SSL_INFO,
+					wsi->user_space, &si, 0))
+		lws_set_timeout(wsi, PENDING_TIMEOUT_KILLED_BY_SSL_INFO, -1);
+}
+
+
+LWS_VISIBLE int
+lws_ssl_close(struct lws *wsi)
+{
+	lws_sockfd_type n;
+
+	if (!wsi->tls.ssl)
+		return 0; /* not handled */
+
+#if defined (LWS_HAVE_SSL_SET_INFO_CALLBACK)
+	/* kill ssl callbacks, becausse we will remove the fd from the
+	 * table linking it to the wsi
+	 */
+	if (wsi->vhost->tls.ssl_info_event_mask)
+		SSL_set_info_callback(wsi->tls.ssl, NULL);
+#endif
+
+	n = SSL_get_fd(wsi->tls.ssl);
+	if (!wsi->socket_is_permanently_unusable)
+		SSL_shutdown(wsi->tls.ssl);
+	compatible_close(n);
+	SSL_free(wsi->tls.ssl);
+	wsi->tls.ssl = NULL;
+
+	if (!lwsi_role_client(wsi) &&
+	    wsi->context->simultaneous_ssl_restriction &&
+	    wsi->context->simultaneous_ssl-- ==
+			    wsi->context->simultaneous_ssl_restriction)
+		/* we made space and can do an accept */
+		lws_gate_accepts(wsi->context, 1);
+
+#if defined(LWS_WITH_STATS)
+	wsi->context->updated = 1;
+#endif
+
+	return 1; /* handled */
+}
+
+void
+lws_ssl_SSL_CTX_destroy(struct lws_vhost *vhost)
+{
+	if (vhost->tls.ssl_ctx)
+		SSL_CTX_free(vhost->tls.ssl_ctx);
+
+	if (!vhost->tls.user_supplied_ssl_ctx && vhost->tls.ssl_client_ctx)
+		SSL_CTX_free(vhost->tls.ssl_client_ctx);
+#if defined(LWS_WITH_ACME)
+	lws_tls_acme_sni_cert_destroy(vhost);
+#endif
+}
+
+void
+lws_ssl_context_destroy(struct lws_context *context)
+{
+}
+
+lws_tls_ctx *
+lws_tls_ctx_from_wsi(struct lws *wsi)
+{
+	if (!wsi->tls.ssl)
+		return NULL;
+
+	return SSL_get_SSL_CTX(wsi->tls.ssl);
+}
+
+enum lws_ssl_capable_status
+__lws_tls_shutdown(struct lws *wsi)
+{
+	int n = SSL_shutdown(wsi->tls.ssl);
+
+	lwsl_debug("SSL_shutdown=%d for fd %d\n", n, wsi->desc.sockfd);
+
+	switch (n) {
+	case 1: /* successful completion */
+		n = shutdown(wsi->desc.sockfd, SHUT_WR);
+		return LWS_SSL_CAPABLE_DONE;
+
+	case 0: /* needs a retry */
+		__lws_change_pollfd(wsi, 0, LWS_POLLIN);
+		return LWS_SSL_CAPABLE_MORE_SERVICE;
+
+	default: /* fatal error, or WANT */
+		n = SSL_get_error(wsi->tls.ssl, n);
+		if (n != SSL_ERROR_SYSCALL && n != SSL_ERROR_SSL) {
+			if (SSL_want_read(wsi->tls.ssl)) {
+				lwsl_debug("(wants read)\n");
+				__lws_change_pollfd(wsi, 0, LWS_POLLIN);
+				return LWS_SSL_CAPABLE_MORE_SERVICE_READ;
+			}
+			if (SSL_want_write(wsi->tls.ssl)) {
+				lwsl_debug("(wants write)\n");
+				__lws_change_pollfd(wsi, 0, LWS_POLLOUT);
+				return LWS_SSL_CAPABLE_MORE_SERVICE_WRITE;
+			}
+		}
+		return LWS_SSL_CAPABLE_ERROR;
+	}
+}
+
+static time_t
+lws_tls_mbedtls_time_to_unix(mbedtls_x509_time *xtime)
+{
+	struct tm t;
+
+	if (!xtime || !xtime->year || xtime->year < 0)
+		return (time_t)(long long)-1;
+
+	memset(&t, 0, sizeof(t));
+
+	t.tm_year = xtime->year - 1900;
+	t.tm_mon = xtime->mon - 1; /* mbedtls months are 1+, tm are 0+ */
+	t.tm_mday = xtime->day - 1; /* mbedtls days are 1+, tm are 0+ */
+	t.tm_hour = xtime->hour;
+	t.tm_min = xtime->min;
+	t.tm_sec = xtime->sec;
+	t.tm_isdst = -1;
+
+	return mktime(&t);
+}
+
+static int
+lws_tls_mbedtls_get_x509_name(mbedtls_x509_name *name,
+			      union lws_tls_cert_info_results *buf, size_t len)
+{
+	while (name) {
+		if (MBEDTLS_OID_CMP(MBEDTLS_OID_AT_CN, &name->oid)) {
+			name = name->next;
+			continue;
+		}
+
+		if (len - 1 < name->val.len)
+			return -1;
+
+		memcpy(&buf->ns.name[0], name->val.p, name->val.len);
+		buf->ns.name[name->val.len] = '\0';
+		buf->ns.len = name->val.len;
+
+		return 0;
+	}
+
+	return -1;
+}
+
+static int
+lws_tls_mbedtls_cert_info(mbedtls_x509_crt *x509, enum lws_tls_cert_info type,
+			  union lws_tls_cert_info_results *buf, size_t len)
+{
+	if (!x509)
+		return -1;
+
+	switch (type) {
+	case LWS_TLS_CERT_INFO_VALIDITY_FROM:
+		buf->time = lws_tls_mbedtls_time_to_unix(&x509->valid_from);
+		if (buf->time == (time_t)(long long)-1)
+			return -1;
+		break;
+
+	case LWS_TLS_CERT_INFO_VALIDITY_TO:
+		buf->time = lws_tls_mbedtls_time_to_unix(&x509->valid_to);
+		if (buf->time == (time_t)(long long)-1)
+			return -1;
+		break;
+
+	case LWS_TLS_CERT_INFO_COMMON_NAME:
+		return lws_tls_mbedtls_get_x509_name(&x509->subject, buf, len);
+
+	case LWS_TLS_CERT_INFO_ISSUER_NAME:
+		return lws_tls_mbedtls_get_x509_name(&x509->issuer, buf, len);
+
+	case LWS_TLS_CERT_INFO_USAGE:
+		buf->usage = x509->key_usage;
+		break;
+
+	case LWS_TLS_CERT_INFO_OPAQUE_PUBLIC_KEY:
+	{
+		char *p = buf->ns.name;
+		size_t r = len, u;
+
+		switch (mbedtls_pk_get_type(&x509->pk)) {
+		case MBEDTLS_PK_RSA:
+		{
+			mbedtls_rsa_context *rsa = mbedtls_pk_rsa(x509->pk);
+
+			if (mbedtls_mpi_write_string(&rsa->N, 16, p, r, &u))
+				return -1;
+			r -= u;
+			p += u;
+			if (mbedtls_mpi_write_string(&rsa->E, 16, p, r, &u))
+				return -1;
+
+			p += u;
+			buf->ns.len = lws_ptr_diff(p, buf->ns.name);
+			break;
+		}
+		case MBEDTLS_PK_ECKEY:
+		{
+			mbedtls_ecp_keypair *ecp = mbedtls_pk_ec(x509->pk);
+
+			if (mbedtls_mpi_write_string(&ecp->Q.X, 16, p, r, &u))
+				 return -1;
+			r -= u;
+			p += u;
+			if (mbedtls_mpi_write_string(&ecp->Q.Y, 16, p, r, &u))
+				 return -1;
+			r -= u;
+			p += u;
+			if (mbedtls_mpi_write_string(&ecp->Q.Z, 16, p, r, &u))
+				 return -1;
+			p += u;
+			buf->ns.len = lws_ptr_diff(p, buf->ns.name);
+			break;
+		}
+		default:
+			lwsl_notice("%s: x509 has unsupported pubkey type %d\n",
+				    __func__,
+				    mbedtls_pk_get_type(&x509->pk));
+
+			return -1;
+		}
+		break;
+	}
+
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+
+LWS_VISIBLE LWS_EXTERN int
+lws_tls_vhost_cert_info(struct lws_vhost *vhost, enum lws_tls_cert_info type,
+		        union lws_tls_cert_info_results *buf, size_t len)
+{
+	mbedtls_x509_crt *x509 = ssl_ctx_get_mbedtls_x509_crt(vhost->tls.ssl_ctx);
+
+	return lws_tls_mbedtls_cert_info(x509, type, buf, len);
+}
+
+LWS_VISIBLE int
+lws_tls_peer_cert_info(struct lws *wsi, enum lws_tls_cert_info type,
+		       union lws_tls_cert_info_results *buf, size_t len)
+{
+	mbedtls_x509_crt *x509;
+
+	wsi = lws_get_network_wsi(wsi);
+
+	x509 = ssl_get_peer_mbedtls_x509_crt(wsi->tls.ssl);
+
+	if (!x509)
+		return -1;
+
+	switch (type) {
+	case LWS_TLS_CERT_INFO_VERIFIED:
+		buf->verified = SSL_get_verify_result(wsi->tls.ssl) == X509_V_OK;
+		return 0;
+	default:
+		return lws_tls_mbedtls_cert_info(x509, type, buf, len);
+	}
+
+	return -1;
+}
+
+static int
+tops_fake_POLLIN_for_buffered_mbedtls(struct lws_context_per_thread *pt)
+{
+	return lws_tls_fake_POLLIN_for_buffered(pt);
+}
+
+static int
+tops_periodic_housekeeping_mbedtls(struct lws_context *context, time_t now)
+{
+	int n;
+
+	n = lws_compare_time_t(context, now, context->tls.last_cert_check_s);
+	if ((!context->tls.last_cert_check_s || n > (24 * 60 * 60)) &&
+	    !lws_tls_check_all_cert_lifetimes(context))
+		context->tls.last_cert_check_s = now;
+
+	return 0;
+}
+
+const struct lws_tls_ops tls_ops_mbedtls = {
+	/* fake_POLLIN_for_buffered */	tops_fake_POLLIN_for_buffered_mbedtls,
+	/* periodic_housekeeping */	tops_periodic_housekeeping_mbedtls,
+};