[Python-checkins] cpython: ssl.create_default_context() sets OP_NO_COMPRESSION to prevent CRIME

[christian.heimes]

http://hg.python.org/cpython/rev/98eb88d3d94e
changeset:   87622:98eb88d3d94e
user:        Christian Heimes <christian at cheimes.de>
date:        Thu Nov 28 08:06:54 2013 +0100
summary:
  ssl.create_default_context() sets OP_NO_COMPRESSION to prevent CRIME

files:
  Lib/ssl.py |  2 ++
  Misc/NEWS  |  2 ++
  2 files changed, 4 insertions(+), 0 deletions(-)


diff --git a/Lib/ssl.py b/Lib/ssl.py
--- a/Lib/ssl.py
+++ b/Lib/ssl.py
@@ -383,6 +383,8 @@
     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
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -18,6 +18,8 @@
 Library
 -------
 
+- ssl.create_default_context() sets OP_NO_COMPRESSION to prevent CRIME.
+
 - Issue #19802: Add socket.SO_PRIORITY.
 
 - Issue #11508: Fixed uuid.getnode() and uuid.uuid1() on environment with

-- 
Repository URL: http://hg.python.org/cpython