1 files changed, 11 insertions, 0 deletions

diff --git a/src/lib/libssl/ssl3.h b/src/lib/libssl/ssl3.h
index baaa89e717..9c2c41287a 100644
--- a/src/lib/libssl/ssl3.h
+++ b/src/lib/libssl/ssl3.h
@@ -379,6 +379,17 @@ typedef struct ssl3_buffer_st
 #define SSL3_FLAGS_POP_BUFFER                   0x0004
 #define TLS1_FLAGS_TLS_PADDING_BUG              0x0008
 #define TLS1_FLAGS_SKIP_CERT_VERIFY             0x0010
+ 
+/* SSL3_FLAGS_SGC_RESTART_DONE is set when we
+ * restart a handshake because of MS SGC and so prevents us
+ * from restarting the handshake in a loop. It's reset on a
+ * renegotiation, so effectively limits the client to one restart
+ * per negotiation. This limits the possibility of a DDoS
+ * attack where the client handshakes in a loop using SGC to
+ * restart. Servers which permit renegotiation can still be
+ * effected, but we can't prevent that.
+ */
+#define SSL3_FLAGS_SGC_RESTART_DONE             0x0040
 
 typedef struct ssl3_state_st
         {