[nginx] SSL: fixed SSL_clear_options() usage with OpenSSL 1.1.0+.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/3443fe40bdc7
branches:  
changeset: 7318:3443fe40bdc7
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Mon Jul 16 17:47:20 2018 +0300
description:
SSL: fixed SSL_clear_options() usage with OpenSSL 1.1.0+.

In OpenSSL 1.1.0 the SSL_CTRL_CLEAR_OPTIONS macro was removed, so
conditional compilation test on it results in SSL_clear_options()
and SSL_CTX_clear_options() not being used.  Notably, this caused
"ssl_prefer_server_ciphers off" to not work in SNI-based virtual
servers if server preference was switched on in the default server.

It looks like the only possible fix is to test OPENSSL_VERSION_NUMBER
explicitly.

diffstat:

 src/event/ngx_event_openssl.c |  2 +-
 src/http/ngx_http_request.c   |  2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diffs (24 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
@@ -295,7 +295,7 @@ ngx_ssl_create(ngx_ssl_t *ssl, ngx_uint_
 
     SSL_CTX_set_options(ssl->ctx, SSL_OP_SINGLE_DH_USE);
 
-#ifdef SSL_CTRL_CLEAR_OPTIONS
+#if OPENSSL_VERSION_NUMBER >= 0x009080dfL
     /* only in 0.9.8m+ */
     SSL_CTX_clear_options(ssl->ctx,
                           SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_TLSv1);
diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -912,7 +912,7 @@ ngx_http_ssl_servername(ngx_ssl_conn_t *
 
         SSL_set_verify_depth(ssl_conn, SSL_CTX_get_verify_depth(sscf->ssl.ctx));
 
-#ifdef SSL_CTRL_CLEAR_OPTIONS
+#if OPENSSL_VERSION_NUMBER >= 0x009080dfL
         /* only in 0.9.8m+ */
         SSL_clear_options(ssl_conn, SSL_get_options(ssl_conn) &
                                     ~SSL_CTX_get_options(sscf->ssl.ctx));