From d50291e2907b59e2cebe5e7b85d9ab29da475ca5 Mon Sep 17 00:00:00 2001
From: Kevin Fwu <kfwu@litespeedtech.com>
Date: Wed, 27 May 2020 08:53:29 -0400
Subject: [PATCH] Fix TLS certificate loading for chained certificates.

This impacts client verification for chained certificates (such as Lets
Encrypt certificates). Client Verify requires the full chain in order to
properly verify the certificate.
---
 src/tls.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tls.c b/src/tls.c
index 28a74df9a..a62f2284e 100644
--- a/src/tls.c
+++ b/src/tls.c
@@ -217,7 +217,7 @@ int tlsConfigure(redisTLSContextConfig *ctx_config) {
     SSL_CTX_set_ecdh_auto(ctx, 1);
 #endif
 
-    if (SSL_CTX_use_certificate_file(ctx, ctx_config->cert_file, SSL_FILETYPE_PEM) <= 0) {
+    if (SSL_CTX_use_certificate_chain_file(ctx, ctx_config->cert_file) <= 0) {
         ERR_error_string_n(ERR_get_error(), errbuf, sizeof(errbuf));
         serverLog(LL_WARNING, "Failed to load certificate: %s: %s", ctx_config->cert_file, errbuf);
         goto error;