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From 991f0176e188227647bf4c993d8da81cf794b3ae Mon Sep 17 00:00:00 2001
From: Christian Heimes <christian@python.org>
Date: Sun, 25 Feb 2018 20:03:07 +0100
Subject: [PATCH] bpo-30008: SSL module: emulate tls methods
OpenSSL 1.1 compatility: emulate version specific TLS methods with
SSL_CTX_set_min/max_proto_version().
---
.../2018-02-25-20-05-51.bpo-30008.6Bmyhr.rst | 4 +
Modules/_ssl.c | 134 ++++++++++++++----
2 files changed, 108 insertions(+), 30 deletions(-)
create mode 100644 Misc/NEWS.d/next/Library/2018-02-25-20-05-51.bpo-30008.6Bmyhr.rst
diff --git a/Misc/NEWS.d/next/Library/2018-02-25-20-05-51.bpo-30008.6Bmyhr.rst b/Misc/NEWS.d/next/Library/2018-02-25-20-05-51.bpo-30008.6Bmyhr.rst
new file mode 100644
index 000000000000..e0a08464a1e1
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-02-25-20-05-51.bpo-30008.6Bmyhr.rst
@@ -0,0 +1,4 @@
+The ssl module no longer uses function that are deprecated since OpenSSL
+1.1.0. The version specific TLS methods are emulated with TLS_method() plus
+SSL_CTX_set_min/max_proto_version(). Pseudo random numbers are generated
+with RAND_bytes().
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index f50823e6947a..827026e3bf5c 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -45,14 +45,6 @@ static PySocketModule_APIObject PySocketModule;
#include <sys/poll.h>
#endif
-/* Don't warn about deprecated functions */
-#ifdef __GNUC__
-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-#endif
-#ifdef __clang__
-#pragma clang diagnostic ignored "-Wdeprecated-declarations"
-#endif
-
/* Include OpenSSL header files */
#include "openssl/rsa.h"
#include "openssl/crypto.h"
@@ -205,6 +197,7 @@ static void _PySSLFixErrno(void) {
#ifndef PY_OPENSSL_1_1_API
/* OpenSSL 1.1 API shims for OpenSSL < 1.1.0 and LibreSSL < 2.7.0 */
+#define ASN1_STRING_get0_data ASN1_STRING_data
#define TLS_method SSLv23_method
#define TLS_client_method SSLv23_client_method
#define TLS_server_method SSLv23_server_method
@@ -896,7 +889,7 @@ _ssl_configure_hostname(PySSLSocket *self, const char* server_hostname)
goto error;
}
} else {
- if (!X509_VERIFY_PARAM_set1_ip(param, ASN1_STRING_data(ip),
+ if (!X509_VERIFY_PARAM_set1_ip(param, ASN1_STRING_get0_data(ip),
ASN1_STRING_length(ip))) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto error;
@@ -1372,8 +1365,9 @@ _get_peer_alt_names (X509 *certificate) {
goto fail;
}
PyTuple_SET_ITEM(t, 0, v);
- v = PyUnicode_FromStringAndSize((char *)ASN1_STRING_data(as),
- ASN1_STRING_length(as));
+ v = PyUnicode_FromStringAndSize(
+ (char *)ASN1_STRING_get0_data(as),
+ ASN1_STRING_length(as));
if (v == NULL) {
Py_DECREF(t);
goto fail;
@@ -3031,44 +3025,124 @@ _ssl__SSLContext_impl(PyTypeObject *type, int proto_version)
long options;
SSL_CTX *ctx = NULL;
X509_VERIFY_PARAM *params;
- int result;
+ int result = 0;
#if defined(SSL_MODE_RELEASE_BUFFERS)
unsigned long libver;
#endif
PySSL_BEGIN_ALLOW_THREADS
- if (proto_version == PY_SSL_VERSION_TLS1)
+ switch (proto_version) {
+#if OPENSSL_VERSION_NUMBER <= 0x10100000L
+ /* OpenSSL < 1.1.0 or not LibreSSL
+ * Use old-style methods for OpenSSL 1.0.2
+ */
+#if defined(SSL2_VERSION) && !defined(OPENSSL_NO_SSL2)
+ case PY_SSL_VERSION_SSL2:
+ ctx = SSL_CTX_new(SSLv2_method());
+ break;
+#endif
+#if defined(SSL3_VERSION) && !defined(OPENSSL_NO_SSL3)
+ case PY_SSL_VERSION_SSL3:
+ ctx = SSL_CTX_new(SSLv3_method());
+ break;
+#endif
+#if defined(TLS1_VERSION) && !defined(OPENSSL_NO_TLS1)
+ case PY_SSL_VERSION_TLS1:
ctx = SSL_CTX_new(TLSv1_method());
-#if HAVE_TLSv1_2
- else if (proto_version == PY_SSL_VERSION_TLS1_1)
+ break;
+#endif
+#if defined(TLS1_1_VERSION) && !defined(OPENSSL_NO_TLS1_1)
+ case PY_SSL_VERSION_TLS1_1:
ctx = SSL_CTX_new(TLSv1_1_method());
- else if (proto_version == PY_SSL_VERSION_TLS1_2)
+ break;
+#endif
+#if defined(TLS1_2_VERSION) && !defined(OPENSSL_NO_TLS1_2)
+ case PY_SSL_VERSION_TLS1_2:
ctx = SSL_CTX_new(TLSv1_2_method());
+ break;
#endif
-#ifndef OPENSSL_NO_SSL3
- else if (proto_version == PY_SSL_VERSION_SSL3)
- ctx = SSL_CTX_new(SSLv3_method());
+#else
+ /* OpenSSL >= 1.1 or LibreSSL
+ * create context with TLS_method for all protocols
+ * no SSLv2_method in OpenSSL 1.1.
+ */
+#if defined(SSL3_VERSION) && !defined(OPENSSL_NO_SSL3)
+ case PY_SSL_VERSION_SSL3:
+ ctx = SSL_CTX_new(TLS_method());
+ if (ctx != NULL) {
+ /* OpenSSL 1.1.0 sets SSL_OP_NO_SSLv3 for TLS_method by default */
+ SSL_CTX_clear_options(ctx, SSL_OP_NO_SSLv3);
+ if (!SSL_CTX_set_min_proto_version(ctx, SSL3_VERSION))
+ result = -2;
+ if (!SSL_CTX_set_max_proto_version(ctx, SSL3_VERSION))
+ result = -2;
+ }
+ break;
#endif
-#ifndef OPENSSL_NO_SSL2
- else if (proto_version == PY_SSL_VERSION_SSL2)
- ctx = SSL_CTX_new(SSLv2_method());
+#if defined(TLS1_VERSION) && !defined(OPENSSL_NO_TLS1)
+ case PY_SSL_VERSION_TLS1:
+ ctx = SSL_CTX_new(TLS_method());
+ if (ctx != NULL) {
+ SSL_CTX_clear_options(ctx, SSL_OP_NO_TLSv1);
+ if (!SSL_CTX_set_min_proto_version(ctx, TLS1_VERSION))
+ result = -2;
+ if (!SSL_CTX_set_max_proto_version(ctx, TLS1_VERSION))
+ result = -2;
+ }
+ break;
+#endif
+#if defined(TLS1_1_VERSION) && !defined(OPENSSL_NO_TLS1_1)
+ case PY_SSL_VERSION_TLS1_1:
+ ctx = SSL_CTX_new(TLS_method());
+ if (ctx != NULL) {
+ SSL_CTX_clear_options(ctx, SSL_OP_NO_TLSv1_1);
+ if (!SSL_CTX_set_min_proto_version(ctx, TLS1_1_VERSION))
+ result = -2;
+ if (!SSL_CTX_set_max_proto_version(ctx, TLS1_1_VERSION))
+ result = -2;
+ }
+ break;
+#endif
+#if defined(TLS1_2_VERSION) && !defined(OPENSSL_NO_TLS1_2)
+ case PY_SSL_VERSION_TLS1_2:
+ ctx = SSL_CTX_new(TLS_method());
+ if (ctx != NULL) {
+ SSL_CTX_clear_options(ctx, SSL_OP_NO_TLSv1_2);
+ if (!SSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION))
+ result = -2;
+ if (!SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION))
+ result = -2;
+ }
+ break;
#endif
- else if (proto_version == PY_SSL_VERSION_TLS) /* SSLv23 */
+#endif /* OpenSSL >= 1.1 */
+ case PY_SSL_VERSION_TLS:
+ /* SSLv23 */
ctx = SSL_CTX_new(TLS_method());
- else if (proto_version == PY_SSL_VERSION_TLS_CLIENT)
+ break;
+ case PY_SSL_VERSION_TLS_CLIENT:
ctx = SSL_CTX_new(TLS_client_method());
- else if (proto_version == PY_SSL_VERSION_TLS_SERVER)
+ break;
+ case PY_SSL_VERSION_TLS_SERVER:
ctx = SSL_CTX_new(TLS_server_method());
- else
- proto_version = -1;
+ break;
+ default:
+ result = -1;
+ break;
+ }
PySSL_END_ALLOW_THREADS
- if (proto_version == -1) {
+ if (result == -1) {
PyErr_SetString(PyExc_ValueError,
"invalid protocol version");
return NULL;
}
- if (ctx == NULL) {
+ else if (result == -2) {
+ PyErr_SetString(PyExc_ValueError,
+ "protocol configuration error");
+ return NULL;
+ }
+ else if (ctx == NULL) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
return NULL;
}
@@ -5241,7 +5315,7 @@ PySSL_RAND(int len, int pseudo)
if (bytes == NULL)
return NULL;
if (pseudo) {
- ok = RAND_pseudo_bytes((unsigned char*)PyBytes_AS_STRING(bytes), len);
+ ok = (_PyOS_URandom((unsigned char*)PyBytes_AS_STRING(bytes), len) == 0 ? 1 : 0);
if (ok == 0 || ok == 1)
return Py_BuildValue("NO", bytes, ok == 1 ? Py_True : Py_False);
}
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