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SSL: save sessions for upstream peers using a callback function.

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In TLSv1.3, NewSessionTicket messages arrive after the handshake and
can come at any time.  Therefore we use a callback to save the session
when we know about it.  This approach works for < TLSv1.3 as well.
The callback function is set once per location on merge phase.

Since SSL_get_session() in BoringSSL returns an unresumable session for
TLSv1.3, peer save_session() methods have been updated as well to use a
session supplied within the callback.  To preserve API, the session is
cached in c->ssl->session.  It is preferably accessed in save_session()
methods by ngx_ssl_get_session() and ngx_ssl_get0_session() wrappers.
This commit is contained in:
Sergey Kandaurov 2018-07-17 12:53:23 +03:00
parent e1bebd05cb
commit d5a27006e0
9 changed files with 139 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
src/event/ngx_event_openssl.c
View File

@ -24,6 +24,8 @@ static int ngx_ssl_verify_callback(int ok, X509_STORE_CTX *x509_store);
static void ngx_ssl_info_callback(const ngx_ssl_conn_t *ssl_conn, int where,
int ret);
static void ngx_ssl_passwords_cleanup(void *data);
static int ngx_ssl_new_client_session(ngx_ssl_conn_t *ssl_conn,
ngx_ssl_session_t *sess);
static void ngx_ssl_handshake_handler(ngx_event_t *ev);
static ngx_int_t ngx_ssl_handle_recv(ngx_connection_t *c, int n);
static void ngx_ssl_write_handler(ngx_event_t *wev);
@ -1161,6 +1163,42 @@ ngx_ssl_ecdh_curve(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *name)
}
ngx_int_t
ngx_ssl_client_session_cache(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_uint_t enable)
{
if (!enable) {
return NGX_OK;
}
SSL_CTX_set_session_cache_mode(ssl->ctx,
SSL_SESS_CACHE_CLIENT
|SSL_SESS_CACHE_NO_INTERNAL);
SSL_CTX_sess_set_new_cb(ssl->ctx, ngx_ssl_new_client_session);
return NGX_OK;
}
static int
ngx_ssl_new_client_session(ngx_ssl_conn_t *ssl_conn, ngx_ssl_session_t *sess)
{
ngx_connection_t *c;
c = ngx_ssl_get_connection(ssl_conn);
if (c->ssl->save_session) {
c->ssl->session = sess;
c->ssl->save_session(c);
c->ssl->session = NULL;
}
return 0;
}
ngx_int_t
ngx_ssl_create_connection(ngx_ssl_t *ssl, ngx_connection_t *c, ngx_uint_t flags)
{
@ -1210,6 +1248,31 @@ ngx_ssl_create_connection(ngx_ssl_t *ssl, ngx_connection_t *c, ngx_uint_t flags)
}
ngx_ssl_session_t *
ngx_ssl_get_session(ngx_connection_t *c)
{
#ifdef TLS1_3_VERSION
if (c->ssl->session) {
SSL_SESSION_up_ref(c->ssl->session);
return c->ssl->session;
}
#endif
return SSL_get1_session(c->ssl->connection);
}
ngx_ssl_session_t *
ngx_ssl_get0_session(ngx_connection_t *c)
{
if (c->ssl->session) {
return c->ssl->session;
}
return SSL_get0_session(c->ssl->connection);
}
ngx_int_t
ngx_ssl_set_session(ngx_connection_t *c, ngx_ssl_session_t *session)
{

8
src/event/ngx_event_openssl.h
View File

@ -77,6 +77,9 @@ struct ngx_ssl_connection_s {
ngx_connection_handler_pt handler;
ngx_ssl_session_t *session;
ngx_connection_handler_pt save_session;
ngx_event_handler_pt saved_read_handler;
ngx_event_handler_pt saved_write_handler;
@ -168,6 +171,8 @@ RSA *ngx_ssl_rsa512_key_callback(ngx_ssl_conn_t *ssl_conn, int is_export,
ngx_array_t *ngx_ssl_read_password_file(ngx_conf_t *cf, ngx_str_t *file);
ngx_int_t ngx_ssl_dhparam(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *file);
ngx_int_t ngx_ssl_ecdh_curve(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *name);
ngx_int_t ngx_ssl_client_session_cache(ngx_conf_t *cf, ngx_ssl_t *ssl,
ngx_uint_t enable);
ngx_int_t ngx_ssl_session_cache(ngx_ssl_t *ssl, ngx_str_t *sess_ctx,
ssize_t builtin_session_cache, ngx_shm_zone_t *shm_zone, time_t timeout);
ngx_int_t ngx_ssl_session_ticket_keys(ngx_conf_t *cf, ngx_ssl_t *ssl,
@ -178,7 +183,8 @@ ngx_int_t ngx_ssl_create_connection(ngx_ssl_t *ssl, ngx_connection_t *c,
void ngx_ssl_remove_cached_session(SSL_CTX *ssl, ngx_ssl_session_t *sess);
ngx_int_t ngx_ssl_set_session(ngx_connection_t *c, ngx_ssl_session_t *session);
#define ngx_ssl_get_session(c) SSL_get1_session(c->ssl->connection)
ngx_ssl_session_t *ngx_ssl_get_session(ngx_connection_t *c);
ngx_ssl_session_t *ngx_ssl_get0_session(ngx_connection_t *c);
#define ngx_ssl_free_session SSL_SESSION_free
#define ngx_ssl_get_connection(ssl_conn) \
SSL_get_ex_data(ssl_conn, ngx_ssl_connection_index)

7
src/http/modules/ngx_http_grpc_module.c
View File

@ -4627,6 +4627,13 @@ ngx_http_grpc_set_ssl(ngx_conf_t *cf, ngx_http_grpc_loc_conf_t *glcf)
}
}
if (ngx_ssl_client_session_cache(cf, glcf->upstream.ssl,
glcf->upstream.ssl_session_reuse)
!= NGX_OK)
{
return NGX_ERROR;
}
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
if (SSL_CTX_set_alpn_protos(glcf->upstream.ssl->ctx,

7
src/http/modules/ngx_http_proxy_module.c
View File

@ -4308,6 +4308,13 @@ ngx_http_proxy_set_ssl(ngx_conf_t *cf, ngx_http_proxy_loc_conf_t *plcf)
}
}
if (ngx_ssl_client_session_cache(cf, plcf->upstream.ssl,
plcf->upstream.ssl_session_reuse)
!= NGX_OK)
{
return NGX_ERROR;
}
return NGX_OK;
}

7
src/http/modules/ngx_http_uwsgi_module.c
View File

@ -2391,6 +2391,13 @@ ngx_http_uwsgi_set_ssl(ngx_conf_t *cf, ngx_http_uwsgi_loc_conf_t *uwcf)
}
}
if (ngx_ssl_client_session_cache(cf, uwcf->upstream.ssl,
uwcf->upstream.ssl_session_reuse)
!= NGX_OK)
{
return NGX_ERROR;
}
return NGX_OK;
}

28
src/http/ngx_http_upstream.c
View File

@ -187,6 +187,7 @@ static void ngx_http_upstream_ssl_init_connection(ngx_http_request_t *,
static void ngx_http_upstream_ssl_handshake_handler(ngx_connection_t *c);
static void ngx_http_upstream_ssl_handshake(ngx_http_request_t *,
ngx_http_upstream_t *u, ngx_connection_t *c);
static void ngx_http_upstream_ssl_save_session(ngx_connection_t *c);
static ngx_int_t ngx_http_upstream_ssl_name(ngx_http_request_t *r,
ngx_http_upstream_t *u, ngx_connection_t *c);
#endif
@ -1675,6 +1676,8 @@ ngx_http_upstream_ssl_init_connection(ngx_http_request_t *r,
}
if (u->conf->ssl_session_reuse) {
c->ssl->save_session = ngx_http_upstream_ssl_save_session;
if (u->peer.set_session(&u->peer, u->peer.data) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u,
NGX_HTTP_INTERNAL_SERVER_ERROR);
@ -1759,10 +1762,6 @@ ngx_http_upstream_ssl_handshake(ngx_http_request_t *r, ngx_http_upstream_t *u,
}
}
if (u->conf->ssl_session_reuse) {
u->peer.save_session(&u->peer, u->peer.data);
}
c->write->handler = ngx_http_upstream_handler;
c->read->handler = ngx_http_upstream_handler;
@ -1782,6 +1781,27 @@ failed:
}
static void
ngx_http_upstream_ssl_save_session(ngx_connection_t *c)
{
ngx_http_request_t *r;
ngx_http_upstream_t *u;
if (c->idle) {
return;
}
r = c->data;
u = r->upstream;
c = r->connection;
ngx_http_set_log_request(c->log, r);
u->peer.save_session(&u->peer, u->peer.data);
}
static ngx_int_t
ngx_http_upstream_ssl_name(ngx_http_request_t *r, ngx_http_upstream_t *u,
ngx_connection_t *c)

2
src/http/ngx_http_upstream_round_robin.c
View File

@ -744,7 +744,7 @@ ngx_http_upstream_save_round_robin_peer_session(ngx_peer_connection_t *pc,
if (peers->shpool) {
ssl_session = SSL_get0_session(pc->connection->ssl->connection);
ssl_session = ngx_ssl_get0_session(pc->connection);
if (ssl_session == NULL) {
return;

27
src/stream/ngx_stream_proxy_module.c
View File

@ -92,6 +92,7 @@ static char *ngx_stream_proxy_ssl_password_file(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static void ngx_stream_proxy_ssl_init_connection(ngx_stream_session_t *s);
static void ngx_stream_proxy_ssl_handshake(ngx_connection_t *pc);
static void ngx_stream_proxy_ssl_save_session(ngx_connection_t *c);
static ngx_int_t ngx_stream_proxy_ssl_name(ngx_stream_session_t *s);
static ngx_int_t ngx_stream_proxy_set_ssl(ngx_conf_t *cf,
ngx_stream_proxy_srv_conf_t *pscf);
@ -1008,6 +1009,8 @@ ngx_stream_proxy_ssl_init_connection(ngx_stream_session_t *s)
}
if (pscf->ssl_session_reuse) {
pc->ssl->save_session = ngx_stream_proxy_ssl_save_session;
if (u->peer.set_session(&u->peer, u->peer.data) != NGX_OK) {
ngx_stream_proxy_finalize(s, NGX_STREAM_INTERNAL_SERVER_ERROR);
return;
@ -1066,11 +1069,6 @@ ngx_stream_proxy_ssl_handshake(ngx_connection_t *pc)
}
}
if (pscf->ssl_session_reuse) {
u = s->upstream;
u->peer.save_session(&u->peer, u->peer.data);
}
if (pc->write->timer_set) {
ngx_del_timer(pc->write);
}
@ -1086,6 +1084,19 @@ failed:
}
static void
ngx_stream_proxy_ssl_save_session(ngx_connection_t *c)
{
ngx_stream_session_t *s;
ngx_stream_upstream_t *u;
s = c->data;
u = s->upstream;
u->peer.save_session(&u->peer, u->peer.data);
}
static ngx_int_t
ngx_stream_proxy_ssl_name(ngx_stream_session_t *s)
{
@ -2051,6 +2062,12 @@ ngx_stream_proxy_set_ssl(ngx_conf_t *cf, ngx_stream_proxy_srv_conf_t *pscf)
}
}
if (ngx_ssl_client_session_cache(cf, pscf->ssl, pscf->ssl_session_reuse)
!= NGX_OK)
{
return NGX_ERROR;
}
return NGX_OK;
}

2
src/stream/ngx_stream_upstream_round_robin.c
View File

@ -776,7 +776,7 @@ ngx_stream_upstream_save_round_robin_peer_session(ngx_peer_connection_t *pc,
if (peers->shpool) {
ssl_session = SSL_get0_session(pc->connection->ssl->connection);
ssl_session = ngx_ssl_get0_session(pc->connection);
if (ssl_session == NULL) {
return;