Enabling configure TLS sessions.

To support TLS sessions, Unit uses the OpenSSL built-in session cache; the
cache_size option defines the number sessions to store.  To disable the feather,
the option must be zero.

1 files changed, 29 insertions, 7 deletions

diff --git a/src/nxt_openssl.c b/src/nxt_openssl.c
index 2fd5d1bf..3b5d4fda 100644
--- a/src/nxt_openssl.c
+++ b/src/nxt_openssl.c
@@ -42,15 +42,16 @@ static void nxt_openssl_lock(int mode, int type, const char *file, int line);
 static unsigned long nxt_openssl_thread_id(void);
 static void nxt_openssl_locks_free(void);
 #endif
-static nxt_int_t nxt_openssl_server_init(nxt_task_t *task,
-    nxt_tls_conf_t *conf, nxt_mp_t *mp, nxt_conf_value_t *conf_cmds,
-    nxt_bool_t last);
+static nxt_int_t nxt_openssl_server_init(nxt_task_t *task, nxt_mp_t *mp,
+    nxt_tls_init_t *tls_init, nxt_bool_t last);
 static nxt_int_t nxt_openssl_chain_file(nxt_task_t *task, SSL_CTX *ctx,
     nxt_tls_conf_t *conf, nxt_mp_t *mp, nxt_bool_t single);
 #if (NXT_HAVE_OPENSSL_CONF_CMD)
 static nxt_int_t nxt_ssl_conf_commands(nxt_task_t *task, SSL_CTX *ctx,
     nxt_conf_value_t *value, nxt_mp_t *mp);
 #endif
+static void nxt_ssl_session_cache(SSL_CTX *ctx, size_t cache_size,
+    time_t timeout);
 static nxt_uint_t nxt_openssl_cert_get_names(nxt_task_t *task, X509 *cert,
     nxt_tls_conf_t *conf, nxt_mp_t *mp);
 static nxt_int_t nxt_openssl_bundle_hash_test(nxt_lvlhsh_query_t *lhq,
@@ -265,11 +266,12 @@ nxt_openssl_locks_free(void)
 
 
 static nxt_int_t
-nxt_openssl_server_init(nxt_task_t *task, nxt_tls_conf_t *conf,
-    nxt_mp_t *mp, nxt_conf_value_t *conf_cmds, nxt_bool_t last)
+nxt_openssl_server_init(nxt_task_t *task, nxt_mp_t *mp,
+    nxt_tls_init_t *tls_init, nxt_bool_t last)
 {
     SSL_CTX                *ctx;
     const char             *ciphers, *ca_certificate;
+    nxt_tls_conf_t         *conf;
     STACK_OF(X509_NAME)    *list;
     nxt_tls_bundle_conf_t  *bundle;
 
@@ -279,6 +281,8 @@ nxt_openssl_server_init(nxt_task_t *task, nxt_tls_conf_t *conf,
         return NXT_ERROR;
     }
 
+    conf = tls_init->conf;
+
     bundle = conf->bundle;
     nxt_assert(bundle != NULL);
 
@@ -337,13 +341,15 @@ nxt_openssl_server_init(nxt_task_t *task, nxt_tls_conf_t *conf,
     }
 
 #if (NXT_HAVE_OPENSSL_CONF_CMD)
-    if (conf_cmds != NULL
-        && nxt_ssl_conf_commands(task, ctx, conf_cmds, mp) != NXT_OK)
+    if (tls_init->conf_cmds != NULL
+        && nxt_ssl_conf_commands(task, ctx, tls_init->conf_cmds, mp) != NXT_OK)
     {
         goto fail;
     }
 #endif
 
+    nxt_ssl_session_cache(ctx, tls_init->cache_size, tls_init->timeout);
+
     SSL_CTX_set_options(ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
 
     if (conf->ca_certificate != NULL) {
@@ -582,6 +588,22 @@ fail:
 #endif
 
 
+static void
+nxt_ssl_session_cache(SSL_CTX *ctx, size_t cache_size, time_t timeout)
+{
+    if (cache_size == 0) {
+        SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
+        return;
+    }
+
+    SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER);
+
+    SSL_CTX_sess_set_cache_size(ctx, cache_size);
+
+    SSL_CTX_set_timeout(ctx, (long) timeout);
+}
+
+
 static nxt_uint_t
 nxt_openssl_cert_get_names(nxt_task_t *task, X509 *cert, nxt_tls_conf_t *conf,
     nxt_mp_t *mp)