1 files changed, 12 insertions, 0 deletions
diff --git a/src/openvpn/ssl_openssl.h b/src/openvpn/ssl_openssl.h
index fc2052c..73a6c49 100644
--- a/src/openvpn/ssl_openssl.h
+++ b/src/openvpn/ssl_openssl.h
@@ -33,6 +33,18 @@
 #include <openssl/ssl.h>
 
 /**
+ * SSL_OP_NO_TICKET tells OpenSSL to disable "stateless session resumption",
+ * as this is something we do not want nor need, but could potentially be
+ * used for a future attack.  For compatibility reasons, in the 2.3.x
+ * series, we keep building if the OpenSSL version is too old to support
+ * this.  2.4 requires it and will fail configure if not present.
+ */
+#ifndef SSL_OP_NO_TICKET
+# define SSL_OP_NO_TICKET 0
+#endif
+
+
+/**
  * Structure that wraps the TLS context. Contents differ depending on the
  * SSL library used.
  */