From 37b7de6df74b29153b4bfd0da5bef28fb4dbda77 Mon Sep 17 00:00:00 2001
From: Maxim Dounin <mdounin@mdounin.ru>
Date: Fri, 20 Dec 2013 16:18:25 +0400
Subject: [PATCH] SSL: ssl_buffer_size directive.

---
 src/event/ngx_event_openssl.c          |  9 ++++++---
 src/event/ngx_event_openssl.h          |  2 ++
 src/http/modules/ngx_http_ssl_module.c | 13 +++++++++++++
 src/http/modules/ngx_http_ssl_module.h |  2 ++
 4 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index ee6671350..8f5ea319e 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -190,6 +190,8 @@ ngx_ssl_create(ngx_ssl_t *ssl, ngx_uint_t protocols, void *data)
         return NGX_ERROR;
     }
 
+    ssl->buffer_size = NGX_SSL_BUFSIZE;
+
     /* client side options */
 
     SSL_CTX_set_options(ssl->ctx, SSL_OP_MICROSOFT_SESS_ID_BUG);
@@ -726,6 +728,7 @@ ngx_ssl_create_connection(ngx_ssl_t *ssl, ngx_connection_t *c, ngx_uint_t flags)
     }
 
     sc->buffer = ((flags & NGX_SSL_BUFFER) != 0);
+    sc->buffer_size = ssl->buffer_size;
 
     sc->connection = SSL_new(ssl->ctx);
 
@@ -1222,7 +1225,7 @@ ngx_ssl_send_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
     buf = c->ssl->buf;
 
     if (buf == NULL) {
-        buf = ngx_create_temp_buf(c->pool, NGX_SSL_BUFSIZE);
+        buf = ngx_create_temp_buf(c->pool, c->ssl->buffer_size);
         if (buf == NULL) {
             return NGX_CHAIN_ERROR;
         }
@@ -1231,14 +1234,14 @@ ngx_ssl_send_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
     }
 
     if (buf->start == NULL) {
-        buf->start = ngx_palloc(c->pool, NGX_SSL_BUFSIZE);
+        buf->start = ngx_palloc(c->pool, c->ssl->buffer_size);
         if (buf->start == NULL) {
             return NGX_CHAIN_ERROR;
         }
 
         buf->pos = buf->start;
         buf->last = buf->start;
-        buf->end = buf->start + NGX_SSL_BUFSIZE;
+        buf->end = buf->start + c->ssl->buffer_size;
     }
 
     send = buf->last - buf->pos;
diff --git a/src/event/ngx_event_openssl.h b/src/event/ngx_event_openssl.h
index 841e82569..907639e83 100644
--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -29,6 +29,7 @@
 typedef struct {
     SSL_CTX                    *ctx;
     ngx_log_t                  *log;
+    size_t                      buffer_size;
 } ngx_ssl_t;
 
 
@@ -37,6 +38,7 @@ typedef struct {
 
     ngx_int_t                   last;
     ngx_buf_t                  *buf;
+    size_t                      buffer_size;
 
     ngx_connection_handler_pt   handler;
 
diff --git a/src/http/modules/ngx_http_ssl_module.c b/src/http/modules/ngx_http_ssl_module.c
index 7ac96c621..a0d258c8a 100644
--- a/src/http/modules/ngx_http_ssl_module.c
+++ b/src/http/modules/ngx_http_ssl_module.c
@@ -111,6 +111,13 @@ static ngx_command_t  ngx_http_ssl_commands[] = {
       offsetof(ngx_http_ssl_srv_conf_t, ciphers),
       NULL },
 
+    { ngx_string("ssl_buffer_size"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_ssl_srv_conf_t, buffer_size),
+      NULL },
+
     { ngx_string("ssl_verify_client"),
       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
       ngx_conf_set_enum_slot,
@@ -424,6 +431,7 @@ ngx_http_ssl_create_srv_conf(ngx_conf_t *cf)
 
     sscf->enable = NGX_CONF_UNSET;
     sscf->prefer_server_ciphers = NGX_CONF_UNSET;
+    sscf->buffer_size = NGX_CONF_UNSET_SIZE;
     sscf->verify = NGX_CONF_UNSET_UINT;
     sscf->verify_depth = NGX_CONF_UNSET_UINT;
     sscf->builtin_session_cache = NGX_CONF_UNSET;
@@ -465,6 +473,9 @@ ngx_http_ssl_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
                          (NGX_CONF_BITMASK_SET|NGX_SSL_SSLv3|NGX_SSL_TLSv1
                           |NGX_SSL_TLSv1_1|NGX_SSL_TLSv1_2));
 
+    ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size,
+                         NGX_SSL_BUFSIZE);
+
     ngx_conf_merge_uint_value(conf->verify, prev->verify, 0);
     ngx_conf_merge_uint_value(conf->verify_depth, prev->verify_depth, 1);
 
@@ -572,6 +583,8 @@ ngx_http_ssl_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
         return NGX_CONF_ERROR;
     }
 
+    conf->ssl.buffer_size = conf->buffer_size;
+
     if (conf->verify) {
 
         if (conf->client_certificate.len == 0 && conf->verify != 3) {
diff --git a/src/http/modules/ngx_http_ssl_module.h b/src/http/modules/ngx_http_ssl_module.h
index 3feb4b6d2..e72b921ac 100644
--- a/src/http/modules/ngx_http_ssl_module.h
+++ b/src/http/modules/ngx_http_ssl_module.h
@@ -26,6 +26,8 @@ typedef struct {
     ngx_uint_t                      verify;
     ngx_uint_t                      verify_depth;
 
+    size_t                          buffer_size;
+
     ssize_t                         builtin_session_cache;
 
     time_t                          session_timeout;