python: Disables SSLv3

This is related to "SSLv3 POODLE vulnerability" CVE-2014-3566

Building python without SSLv3 support when openssl is built without
any support for SSLv3 (e.g. by adding EXTRA_OECONF = " -no-ssl3" in
the openssl recipes).

Backport from:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=768611#22
[python2.7-nossl3.patch] only Modules/_ssl.c is backported.

References:
https://bugzilla.yoctoproject.org/show_bug.cgi?id=7015
https://bugzilla.yoctoproject.org/show_bug.cgi?id=6843
http://bugs.python.org/issue22638
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3566

(From OE-Core rev: 926904f65db33aa7a6a54bd6cdc9c8b34f000b0d)

Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python/python2.7.3-nossl3.patch

@@ -0,0 +1,37 @@
+python: Building without SSLv3 support
+
+Building without SSLv3 support when openssl is built
+without any support for SSLv3
+
+Upstream-Status: Backport
+
+Reference:
+https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=76A8611#22
+
+Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
+---
+diff -ruN a/Modules/_ssl.c b/Modules/_ssl.c
+--- a/Modules/_ssl.c	2014-11-26 07:43:58.755679939 +0100
++++ b/Modules/_ssl.c	2014-11-26 07:49:10.454182400 +0100
+@@ -302,8 +302,10 @@
+     PySSL_BEGIN_ALLOW_THREADS
+     if (proto_version == PY_SSL_VERSION_TLS1)
+         self->ctx = SSL_CTX_new(TLSv1_method()); /* Set up context */
++#ifndef OPENSSL_NO_SSL3
+     else if (proto_version == PY_SSL_VERSION_SSL3)
+         self->ctx = SSL_CTX_new(SSLv3_method()); /* Set up context */
++#endif
+ #ifndef OPENSSL_NO_SSL2
+     else if (proto_version == PY_SSL_VERSION_SSL2)
+         self->ctx = SSL_CTX_new(SSLv2_method()); /* Set up context */
+@@ -1777,8 +1779,10 @@
+     PyModule_AddIntConstant(m, "PROTOCOL_SSLv2",
+                             PY_SSL_VERSION_SSL2);
+ #endif
++#ifndef OPENSSL_NO_SSL3
+     PyModule_AddIntConstant(m, "PROTOCOL_SSLv3",
+                             PY_SSL_VERSION_SSL3);
++#endif
+     PyModule_AddIntConstant(m, "PROTOCOL_SSLv23",
+                             PY_SSL_VERSION_SSL23);
+     PyModule_AddIntConstant(m, "PROTOCOL_TLSv1",

meta/recipes-devtools/python/python_2.7.3.bb

@@ -36,6 +36,7 @@ SRC_URI += "\
   file://python-2.7.3-CVE-2013-1752-smtplib-fix.patch \
   file://python-fix-build-error-with-Readline-6.3.patch \
   file://python-2.7.3-CVE-2014-1912.patch \
+  file://python2.7.3-nossl3.patch \
 "
 
 S = "${WORKDIR}/Python-${PV}"