SSL: ngx_ssl_ciphers() to set list of ciphers.

This patch moves various OpenSSL-specific function calls into the
OpenSSL module and introduces ngx_ssl_ciphers() to make nginx more
crypto-library-agnostic.

src/event/ngx_event_openssl.c

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 810c469..bb9a900 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -592,6 +592,30 @@
 
 
 ngx_int_t
+ngx_ssl_ciphers(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *ciphers,
+    ngx_uint_t prefer_server_ciphers)
+{
+    if (SSL_CTX_set_cipher_list(ssl->ctx, (char *) ciphers->data) == 0) {
+        ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
+                      "SSL_CTX_set_cipher_list(\"%V\") failed",
+                      ciphers);
+        return NGX_ERROR;
+    }
+
+    if (prefer_server_ciphers) {
+        SSL_CTX_set_options(ssl->ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
+    }
+
+#if (OPENSSL_VERSION_NUMBER < 0x10100001L && !defined LIBRESSL_VERSION_NUMBER)
+    /* a temporary 512-bit RSA key is required for export versions of MSIE */
+    SSL_CTX_set_tmp_rsa_callback(ssl->ctx, ngx_ssl_rsa512_key_callback);
+#endif
+
+    return NGX_OK;
+}
+
+
+ngx_int_t
 ngx_ssl_client_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *cert,
     ngx_int_t depth)
 {

src/event/ngx_event_openssl.h

diff --git a/src/event/ngx_event_openssl.h b/src/event/ngx_event_openssl.h
index fc9ec05..3367d10 100644
--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -144,6 +144,8 @@
     ngx_array_t *certs, ngx_array_t *keys, ngx_array_t *passwords);
 ngx_int_t ngx_ssl_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
     ngx_str_t *cert, ngx_str_t *key, ngx_array_t *passwords);
+ngx_int_t ngx_ssl_ciphers(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *ciphers,
+    ngx_uint_t prefer_server_ciphers);
 ngx_int_t ngx_ssl_client_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
     ngx_str_t *cert, ngx_int_t depth);
 ngx_int_t ngx_ssl_trusted_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,

src/http/modules/ngx_http_proxy_module.c

diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 5efee7b..4f49a52 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -4323,13 +4323,9 @@
         }
     }
 
-    if (SSL_CTX_set_cipher_list(plcf->upstream.ssl->ctx,
-                                (const char *) plcf->ssl_ciphers.data)
-        == 0)
+    if (ngx_ssl_ciphers(cf, plcf->upstream.ssl, &plcf->ssl_ciphers, 0)
+        != NGX_OK)
     {
-        ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
-                      "SSL_CTX_set_cipher_list(\"%V\") failed",
-                      &plcf->ssl_ciphers);
         return NGX_ERROR;
     }
 

src/http/modules/ngx_http_ssl_module.c

diff --git a/src/http/modules/ngx_http_ssl_module.c b/src/http/modules/ngx_http_ssl_module.c
index 7f23c86..d685ae9 100644
--- a/src/http/modules/ngx_http_ssl_module.c
+++ b/src/http/modules/ngx_http_ssl_module.c
@@ -689,13 +689,10 @@
         return NGX_CONF_ERROR;
     }
 
-    if (SSL_CTX_set_cipher_list(conf->ssl.ctx,
-                                (const char *) conf->ciphers.data)
-        == 0)
+    if (ngx_ssl_ciphers(cf, &conf->ssl, &conf->ciphers,
+                        conf->prefer_server_ciphers)
+        != NGX_OK)
     {
-        ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
-                      "SSL_CTX_set_cipher_list(\"%V\") failed",
-                      &conf->ciphers);
         return NGX_CONF_ERROR;
     }
 
@@ -730,15 +727,6 @@
         return NGX_CONF_ERROR;
     }
 
-    if (conf->prefer_server_ciphers) {
-        SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
-    }
-
-#if (OPENSSL_VERSION_NUMBER < 0x10100001L && !defined LIBRESSL_VERSION_NUMBER)
-    /* a temporary 512-bit RSA key is required for export versions of MSIE */
-    SSL_CTX_set_tmp_rsa_callback(conf->ssl.ctx, ngx_ssl_rsa512_key_callback);
-#endif
-
     if (ngx_ssl_dhparam(cf, &conf->ssl, &conf->dhparam) != NGX_OK) {
         return NGX_CONF_ERROR;
     }

src/http/modules/ngx_http_uwsgi_module.c

diff --git a/src/http/modules/ngx_http_uwsgi_module.c b/src/http/modules/ngx_http_uwsgi_module.c
index a03c6f6..7f916e8 100644
--- a/src/http/modules/ngx_http_uwsgi_module.c
+++ b/src/http/modules/ngx_http_uwsgi_module.c
@@ -2325,13 +2325,9 @@
         }
     }
 
-    if (SSL_CTX_set_cipher_list(uwcf->upstream.ssl->ctx,
-                                (const char *) uwcf->ssl_ciphers.data)
-        == 0)
+    if (ngx_ssl_ciphers(cf, uwcf->upstream.ssl, &uwcf->ssl_ciphers, 0)
+        != NGX_OK)
     {
-        ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
-                      "SSL_CTX_set_cipher_list(\"%V\") failed",
-                      &uwcf->ssl_ciphers);
         return NGX_ERROR;
     }
 

src/mail/ngx_mail_ssl_module.c

diff --git a/src/mail/ngx_mail_ssl_module.c b/src/mail/ngx_mail_ssl_module.c
index 83cffb8..11e428c 100644
--- a/src/mail/ngx_mail_ssl_module.c
+++ b/src/mail/ngx_mail_ssl_module.c
@@ -422,24 +422,13 @@
         }
     }
 
-    if (SSL_CTX_set_cipher_list(conf->ssl.ctx,
-                                (const char *) conf->ciphers.data)
-        == 0)
+    if (ngx_ssl_ciphers(cf, &conf->ssl, &conf->ciphers,
+                        conf->prefer_server_ciphers)
+        != NGX_OK)
     {
-        ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
-                      "SSL_CTX_set_cipher_list(\"%V\") failed",
-                      &conf->ciphers);
         return NGX_CONF_ERROR;
     }
 
-    if (conf->prefer_server_ciphers) {
-        SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
-    }
-
-#if (OPENSSL_VERSION_NUMBER < 0x10100001L && !defined LIBRESSL_VERSION_NUMBER)
-    SSL_CTX_set_tmp_rsa_callback(conf->ssl.ctx, ngx_ssl_rsa512_key_callback);
-#endif
-
     if (ngx_ssl_dhparam(cf, &conf->ssl, &conf->dhparam) != NGX_OK) {
         return NGX_CONF_ERROR;
     }

src/stream/ngx_stream_proxy_module.c

diff --git a/src/stream/ngx_stream_proxy_module.c b/src/stream/ngx_stream_proxy_module.c
index d4fa994..831fdda 100644
--- a/src/stream/ngx_stream_proxy_module.c
+++ b/src/stream/ngx_stream_proxy_module.c
@@ -1640,13 +1640,7 @@
         }
     }
 
-    if (SSL_CTX_set_cipher_list(pscf->ssl->ctx,
-                                (const char *) pscf->ssl_ciphers.data)
-        == 0)
-    {
-        ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
-                      "SSL_CTX_set_cipher_list(\"%V\") failed",
-                      &pscf->ssl_ciphers);
+    if (ngx_ssl_ciphers(cf, pscf->ssl, &pscf->ssl_ciphers, 0) != NGX_OK) {
         return NGX_ERROR;
     }
 

src/stream/ngx_stream_ssl_module.c

diff --git a/src/stream/ngx_stream_ssl_module.c b/src/stream/ngx_stream_ssl_module.c
index 2d2f3ca..9c559c6 100644
--- a/src/stream/ngx_stream_ssl_module.c
+++ b/src/stream/ngx_stream_ssl_module.c
@@ -266,24 +266,13 @@
         return NGX_CONF_ERROR;
     }
 
-    if (SSL_CTX_set_cipher_list(conf->ssl.ctx,
-                                (const char *) conf->ciphers.data)
-        == 0)
+    if (ngx_ssl_ciphers(cf, &conf->ssl, &conf->ciphers,
+                        conf->prefer_server_ciphers)
+        != NGX_OK)
     {
-        ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
-                      "SSL_CTX_set_cipher_list(\"%V\") failed",
-                      &conf->ciphers);
         return NGX_CONF_ERROR;
     }
 
-    if (conf->prefer_server_ciphers) {
-        SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
-    }
-
-#if (OPENSSL_VERSION_NUMBER < 0x10100001L && !defined LIBRESSL_VERSION_NUMBER)
-    SSL_CTX_set_tmp_rsa_callback(conf->ssl.ctx, ngx_ssl_rsa512_key_callback);
-#endif
-
     if (ngx_ssl_dhparam(cf, &conf->ssl, &conf->dhparam) != NGX_OK) {
         return NGX_CONF_ERROR;
     }