[nginx] SSL: use of SSL_MODE_NO_AUTO_CHAIN.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/4e3f87c02cb4
branches:  
changeset: 6036:4e3f87c02cb4
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Mon Mar 23 02:42:35 2015 +0300
description:
SSL: use of SSL_MODE_NO_AUTO_CHAIN.

The SSL_MODE_NO_AUTO_CHAIN mode prevents OpenSSL from automatically
building a certificate chain on the fly if there is no certificate chain
explicitly provided.  Before this change, certificates provided via the
ssl_client_certificate and ssl_trusted_certificate directives were
used by OpenSSL to automatically build certificate chains, resulting
in unexpected (and in some cases unneeded) chains being sent to clients.

diffstat:

 src/event/ngx_event_openssl.c |  4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diffs (14 lines):

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -285,6 +285,10 @@ ngx_ssl_create(ngx_ssl_t *ssl, ngx_uint_
     SSL_CTX_set_mode(ssl->ctx, SSL_MODE_RELEASE_BUFFERS);
 #endif
 
+#ifdef SSL_MODE_NO_AUTO_CHAIN
+    SSL_CTX_set_mode(ssl->ctx, SSL_MODE_NO_AUTO_CHAIN);
+#endif
+
     SSL_CTX_set_read_ahead(ssl->ctx, 1);
 
     SSL_CTX_set_info_callback(ssl->ctx, ngx_ssl_info_callback);