[Python-checkins] bpo-30622: Improve NPN support detection (#5859)
Christian Heimes
webhook-mailer at python.org
Sat Feb 24 16:12:43 EST 2018
https://github.com/python/cpython/commit/6cdb7954b0a578d899e4b78b868ea59eef08480a
commit: 6cdb7954b0a578d899e4b78b868ea59eef08480a
branch: master
author: Christian Heimes <christian at python.org>
committer: GitHub <noreply at github.com>
date: 2018-02-24T22:12:40+01:00
summary:
bpo-30622: Improve NPN support detection (#5859)
The ssl module now detects missing NPN support in LibreSSL.
Co-Authored-By: Bernard Spil <brnrd at FreeBSD.org>
Signed-off-by: Christian Heimes <christian at python.org>
files:
A Misc/NEWS.d/next/Library/2018-02-24-21-40-42.bpo-30622.dQjxSe.rst
M Doc/library/ssl.rst
M Modules/_ssl.c
M Modules/clinic/_ssl.c.h
diff --git a/Doc/library/ssl.rst b/Doc/library/ssl.rst
index 4cad9f667c48..7371024dce4e 100644
--- a/Doc/library/ssl.rst
+++ b/Doc/library/ssl.rst
@@ -2434,6 +2434,23 @@ successful call of :func:`~ssl.RAND_add`, :func:`~ssl.RAND_bytes` or
:func:`~ssl.RAND_pseudo_bytes` is sufficient.
+.. ssl-libressl:
+
+LibreSSL support
+----------------
+
+LibreSSL is a fork of OpenSSL 1.0.1. The ssl module has limited support for
+LibreSSL. Some features are not available when the ssl module is compiled
+with LibreSSL.
+
+* LibreSSL >= 2.6.1 no longer supports NPN. The methods
+ :meth:`SSLContext.set_npn_protocols` and
+ :meth:`SSLSocket.selected_npn_protocol` are not available.
+* :meth:`SSLContext.set_default_verify_paths` ignores the env vars
+ :envvar:`SSL_CERT_FILE` and :envvar:`SSL_CERT_PATH` although
+ :func:`get_default_verify_paths` still reports them.
+
+
.. seealso::
Class :class:`socket.socket`
diff --git a/Misc/NEWS.d/next/Library/2018-02-24-21-40-42.bpo-30622.dQjxSe.rst b/Misc/NEWS.d/next/Library/2018-02-24-21-40-42.bpo-30622.dQjxSe.rst
new file mode 100644
index 000000000000..bcb659b24dd3
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-02-24-21-40-42.bpo-30622.dQjxSe.rst
@@ -0,0 +1 @@
+The ssl module now detects missing NPN support in LibreSSL.
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index 2136cbdeae47..ed6b7a835a94 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -160,6 +160,19 @@ static void _PySSLFixErrno(void) {
# define HAVE_ALPN
#endif
+/* We cannot rely on OPENSSL_NO_NEXTPROTONEG because LibreSSL 2.6.1 dropped
+ * NPN support but did not set OPENSSL_NO_NEXTPROTONEG for compatibility
+ * reasons. The check for TLSEXT_TYPE_next_proto_neg works with
+ * OpenSSL 1.0.1+ and LibreSSL.
+ */
+#ifdef OPENSSL_NO_NEXTPROTONEG
+# define HAVE_NPN 0
+#elif defined(TLSEXT_TYPE_next_proto_neg)
+# define HAVE_NPN 1
+#else
+# define HAVE_NPN 0
+# endif
+
#ifndef INVALID_SOCKET /* MS defines this */
#define INVALID_SOCKET (-1)
#endif
@@ -328,7 +341,7 @@ static unsigned int _ssl_locks_count = 0;
typedef struct {
PyObject_HEAD
SSL_CTX *ctx;
-#if defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#ifdef HAVE_NPN
unsigned char *npn_protocols;
int npn_protocols_len;
#endif
@@ -1909,7 +1922,7 @@ _ssl__SSLSocket_version_impl(PySSLSocket *self)
return PyUnicode_FromString(version);
}
-#if defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#ifdef HAVE_NPN
/*[clinic input]
_ssl._SSLSocket.selected_npn_protocol
[clinic start generated code]*/
@@ -2874,7 +2887,7 @@ _ssl__SSLContext_impl(PyTypeObject *type, int proto_version)
self->ctx = ctx;
self->hostflags = X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS;
self->protocol = proto_version;
-#if defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#ifdef HAVE_NPN
self->npn_protocols = NULL;
#endif
#ifdef HAVE_ALPN
@@ -3013,7 +3026,7 @@ context_dealloc(PySSLContext *self)
PyObject_GC_UnTrack(self);
context_clear(self);
SSL_CTX_free(self->ctx);
-#if defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#ifdef HAVE_NPN
PyMem_FREE(self->npn_protocols);
#endif
#ifdef HAVE_ALPN
@@ -3091,7 +3104,7 @@ _ssl__SSLContext_get_ciphers_impl(PySSLContext *self)
#endif
-#if defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG) || defined(HAVE_ALPN)
+#if defined(HAVE_NPN) || defined(HAVE_ALPN)
static int
do_protocol_selection(int alpn, unsigned char **out, unsigned char *outlen,
const unsigned char *server_protocols, unsigned int server_protocols_len,
@@ -3117,7 +3130,7 @@ do_protocol_selection(int alpn, unsigned char **out, unsigned char *outlen,
}
#endif
-#if defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#ifdef HAVE_NPN
/* this callback gets passed to SSL_CTX_set_next_protos_advertise_cb */
static int
_advertiseNPN_cb(SSL *s,
@@ -3160,7 +3173,7 @@ _ssl__SSLContext__set_npn_protocols_impl(PySSLContext *self,
Py_buffer *protos)
/*[clinic end generated code: output=72b002c3324390c6 input=319fcb66abf95bd7]*/
{
-#if defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#ifdef HAVE_NPN
PyMem_Free(self->npn_protocols);
self->npn_protocols = PyMem_Malloc(protos->len);
if (self->npn_protocols == NULL)
@@ -5705,7 +5718,7 @@ PyInit__ssl(void)
Py_INCREF(r);
PyModule_AddObject(m, "HAS_ECDH", r);
-#if defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#ifdef HAVE_NPN
r = Py_True;
#else
r = Py_False;
diff --git a/Modules/clinic/_ssl.c.h b/Modules/clinic/_ssl.c.h
index 5b6c4af11fb7..1ee1bfb21d3e 100644
--- a/Modules/clinic/_ssl.c.h
+++ b/Modules/clinic/_ssl.c.h
@@ -132,7 +132,7 @@ _ssl__SSLSocket_version(PySSLSocket *self, PyObject *Py_UNUSED(ignored))
return _ssl__SSLSocket_version_impl(self);
}
-#if (defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG))
+#if defined(HAVE_NPN)
PyDoc_STRVAR(_ssl__SSLSocket_selected_npn_protocol__doc__,
"selected_npn_protocol($self, /)\n"
@@ -151,7 +151,7 @@ _ssl__SSLSocket_selected_npn_protocol(PySSLSocket *self, PyObject *Py_UNUSED(ign
return _ssl__SSLSocket_selected_npn_protocol_impl(self);
}
-#endif /* (defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG)) */
+#endif /* defined(HAVE_NPN) */
#if defined(HAVE_ALPN)
@@ -1175,4 +1175,4 @@ _ssl_enum_crls(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObje
#ifndef _SSL_ENUM_CRLS_METHODDEF
#define _SSL_ENUM_CRLS_METHODDEF
#endif /* !defined(_SSL_ENUM_CRLS_METHODDEF) */
-/*[clinic end generated code: output=d987411caeb106e7 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=a00fef6a470cfc2c input=a9049054013a1b77]*/
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