From: Dr. Stephen Henson <steve@openssl.org>
Date: Wed, 4 Jan 2012 16:46:10 +0000 (+0000)
Subject: add missing part for SGC restart fix (CVE-2011-4619)
X-Git-Tag: OpenSSL_1_0_0f~4
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=63819e6f00a53f2bffa7356831c62844ca723d5e;p=oweals%2Fopenssl.git

add missing part for SGC restart fix (CVE-2011-4619)
---

diff --git a/ssl/ssl3.h b/ssl/ssl3.h
index baaa89e717..9c2c41287a 100644
--- a/ssl/ssl3.h
+++ b/ssl/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
 	{