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SSL: explicit clearing of expired sessions.

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This reduces lifetime of session keying material in server's memory, and
therefore can be beneficial from forward secrecy point of view.
This commit is contained in:
Maxim Dounin
2022-10-12 20:14:43 +03:00
parent 76876c160f
commit 3057e6e9ad
1 changed files with 6 additions and 0 deletions
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6
src/event/ngx_event_openssl.c
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@@ -4031,6 +4031,8 @@ ngx_ssl_get_cached_session(ngx_ssl_conn_t *ssl_conn,
ngx_rbtree_delete(&cache->session_rbtree, node);
ngx_explicit_memzero(sess_id->session, sess_id->len);
#if (NGX_PTR_SIZE == 8)
ngx_slab_free_locked(shpool, sess_id->session);
#endif
@@ -4120,6 +4122,8 @@ ngx_ssl_remove_session(SSL_CTX *ssl, ngx_ssl_session_t *sess)
ngx_rbtree_delete(&cache->session_rbtree, node);
ngx_explicit_memzero(sess_id->session, sess_id->len);
#if (NGX_PTR_SIZE == 8)
ngx_slab_free_locked(shpool, sess_id->session);
#endif
@@ -4168,6 +4172,8 @@ ngx_ssl_expire_sessions(ngx_ssl_session_cache_t *cache,
ngx_rbtree_delete(&cache->session_rbtree, &sess_id->node);
ngx_explicit_memzero(sess_id->session, sess_id->len);
#if (NGX_PTR_SIZE == 8)
ngx_slab_free_locked(shpool, sess_id->session);
#endif