From dec813f118f7abffa24a9a0431dea125a6096518 Mon Sep 17 00:00:00 2001
From: Christian Heimes <christian@cheimes.de>
Date: Thu, 28 Nov 2013 08:06:54 +0100
Subject: ssl.create_default_context() sets OP_NO_COMPRESSION to prevent CRIME

---
 Lib/ssl.py | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'Lib/ssl.py')

diff --git a/Lib/ssl.py b/Lib/ssl.py
index 72e6a6e6d4c..b29b90582ed 100644
--- a/Lib/ssl.py
+++ b/Lib/ssl.py
@@ -383,6 +383,8 @@ def create_default_context(purpose=Purpose.SERVER_AUTH, *, cafile=None,
     context = SSLContext(PROTOCOL_TLSv1)
     # SSLv2 considered harmful.
     context.options |= OP_NO_SSLv2
+    # disable compression to prevent CRIME attacks (OpenSSL 1.0+)
+    context.options |= getattr(_ssl, "OP_NO_COMPRESSION", 0)
     # disallow ciphers with known vulnerabilities
     context.set_ciphers(_RESTRICTED_CIPHERS)
     # verify certs in client mode
-- 
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