SSL: use of the SSL_OP_NO_CLIENT_RENEGOTIATION option.
The SSL_OP_NO_CLIENT_RENEGOTIATION option was introduced in LibreSSL 2.5.1.
Unlike OpenSSL's SSL_OP_NO_RENEGOTIATION, it only disables client-initiated
renegotiation, and hence can be safely used on all SSL contexts.
diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index e18480c..987b381 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -368,6 +368,10 @@
SSL_CTX_set_options(ssl->ctx, SSL_OP_NO_ANTI_REPLAY);
#endif
+#ifdef SSL_OP_NO_CLIENT_RENEGOTIATION
+ SSL_CTX_set_options(ssl->ctx, SSL_OP_NO_CLIENT_RENEGOTIATION);
+#endif
+
#ifdef SSL_MODE_RELEASE_BUFFERS
SSL_CTX_set_mode(ssl->ctx, SSL_MODE_RELEASE_BUFFERS);
#endif
