export arcfour_crypt_blob to Python as samba.crypto.arcfour_encrypt
This commit is contained in:
Alexander Bokovoy
parent
de786e0220
commit
563829e681
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From 8a696458dac335071d98f39dfd1380192fbe7733 Mon Sep 17 00:00:00 2001
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From: Alexander Bokovoy <ab@samba.org>
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Date: Fri, 10 Mar 2017 16:20:06 +0200
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Subject: [PATCH] lib/crypto: implement samba.crypto Python module for RC4
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Implement a small Python module that exposes arcfour_crypt_blob()
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function widely used in Samba C code.
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When Samba Python bindings are used to call LSA CreateTrustedDomainEx2,
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there is a need to encrypt trusted credentials with RC4 cipher.
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Current Samba Python code relies on Python runtime to provide RC4
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cipher. However, in FIPS 140-2 mode system crypto libraries do not
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provide access RC4 cipher at all. According to Microsoft dochelp team,
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Windows is treating AuthenticationInformation blob encryption as 'plain
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text' in terms of FIPS 140-2, thus doing application-level encryption.
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Replace samba.arcfour_encrypt() implementation with a call to
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samba.crypto.arcfour_crypt_blob().
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Signed-off-by: Alexander Bokovoy <ab@samba.org>
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Reviewed-by: Simo Sorce <idra@samba.org>
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Reviewed-by: Guenther Deschner <gd@samba.org>
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Autobuild-User(master): Günther Deschner <gd@samba.org>
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Autobuild-Date(master): Wed Mar 15 01:30:24 CET 2017 on sn-devel-144
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(cherry picked from commit bbeef554f2c15e739f6095fcb57d9ef6646b411c)
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---
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lib/crypto/py_crypto.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++
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lib/crypto/wscript_build | 7 ++++
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python/samba/__init__.py | 16 ++-------
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3 files changed, 99 insertions(+), 14 deletions(-)
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create mode 100644 lib/crypto/py_crypto.c
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diff --git a/lib/crypto/py_crypto.c b/lib/crypto/py_crypto.c
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new file mode 100644
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index 0000000..bf7f9f4
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--- /dev/null
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+++ b/lib/crypto/py_crypto.c
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@@ -0,0 +1,90 @@
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+/*
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+ Unix SMB/CIFS implementation.
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+ Samba crypto functions
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+
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+ Copyright (C) Alexander Bokovoy <ab@samba.org> 2017
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 3 of the License, or
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+ (at your option) any later version.
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+
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+ This program is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program. If not, see <http://www.gnu.org/licenses/>.
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+*/
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+
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+#include <Python.h>
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+#include "includes.h"
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+#include "python/py3compat.h"
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+#include "lib/crypto/arcfour.h"
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+
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+static PyObject *py_crypto_arcfour_crypt_blob(PyObject *module, PyObject *args, PyObject *kwargs)
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+{
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+ DATA_BLOB data, key;
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+ PyObject *py_data, *py_key, *result;
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+ TALLOC_CTX *ctx;
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+
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+ if (!PyArg_ParseTuple(args, "OO", &py_data, &py_key))
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+ return NULL;
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+
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+ if (!PyBytes_Check(py_data)) {
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+ PyErr_Format(PyExc_TypeError, "bytes expected");
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+ return NULL;
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+ }
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+
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+ if (!PyBytes_Check(py_key)) {
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+ PyErr_Format(PyExc_TypeError, "bytes expected");
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+ return NULL;
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+ }
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+
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+ ctx = talloc_new(NULL);
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+
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+ data.length = PyBytes_Size(py_data);
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+ data.data = talloc_memdup(ctx, PyBytes_AsString(py_data), data.length);
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+ if (!data.data) {
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+ talloc_free(ctx);
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+ return PyErr_NoMemory();
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+ }
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+
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+ key.data = (uint8_t *)PyBytes_AsString(py_key);
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+ key.length = PyBytes_Size(py_key);
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+
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+ arcfour_crypt_blob(data.data, data.length, &key);
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+
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+ result = PyBytes_FromStringAndSize((const char*) data.data, data.length);
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+ talloc_free(ctx);
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+ return result;
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+}
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+
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+
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+static const char py_crypto_arcfour_crypt_blob_doc[] = "arcfour_crypt_blob(data, key)\n"
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+ "Encrypt the data with RC4 algorithm using the key";
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+
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+static PyMethodDef py_crypto_methods[] = {
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+ { "arcfour_crypt_blob", (PyCFunction)py_crypto_arcfour_crypt_blob, METH_VARARGS, py_crypto_arcfour_crypt_blob_doc },
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+ { NULL },
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+};
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+
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+static struct PyModuleDef moduledef = {
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+ PyModuleDef_HEAD_INIT,
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+ .m_name = "crypto",
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+ .m_doc = "Crypto functions required for SMB",
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+ .m_size = -1,
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+ .m_methods = py_crypto_methods,
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+};
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+
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+MODULE_INIT_FUNC(crypto)
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+{
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+ PyObject *m;
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+
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+ m = PyModule_Create(&moduledef);
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+ if (m == NULL)
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+ return NULL;
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+
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+ return m;
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+}
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diff --git a/lib/crypto/wscript_build b/lib/crypto/wscript_build
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index 7f94532..d1f152e 100644
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--- a/lib/crypto/wscript_build
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+++ b/lib/crypto/wscript_build
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@@ -25,3 +25,10 @@ bld.SAMBA_SUBSYSTEM('TORTURE_LIBCRYPTO',
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autoproto='test_proto.h',
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deps='LIBCRYPTO'
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)
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+
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+for env in bld.gen_python_environments():
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+ bld.SAMBA_PYTHON('python_crypto',
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+ source='py_crypto.c',
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+ deps='LIBCRYPTO',
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+ realname='samba/crypto.so'
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+ )
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diff --git a/python/samba/__init__.py b/python/samba/__init__.py
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index 19d5e38..fa4244a 100644
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--- a/python/samba/__init__.py
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+++ b/python/samba/__init__.py
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@@ -371,20 +371,8 @@ def string_to_byte_array(string):
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return blob
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def arcfour_encrypt(key, data):
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- try:
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- from Crypto.Cipher import ARC4
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- c = ARC4.new(key)
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- return c.encrypt(data)
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- except ImportError as e:
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- pass
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- try:
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- from M2Crypto.RC4 import RC4
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- c = RC4(key)
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- return c.update(data)
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- except ImportError as e:
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- pass
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- raise Exception("arcfour_encrypt() requires " +
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- "python*-crypto or python*-m2crypto or m2crypto")
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+ from samba.crypto import arcfour_crypt_blob
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+ return arcfour_crypt_blob(data, key)
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import _glue
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version = _glue.version
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--
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2.9.3
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@ -6,7 +6,7 @@
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# ctdb is enabled by default, you can disable it with: --without clustering
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%bcond_without clustering
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%define main_release 3
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%define main_release 4
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%define samba_version 4.6.0
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%define talloc_version 2.1.9
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@ -109,6 +109,7 @@ Source201: README.downgrade
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Patch0: samba-v4.6-gss_krb5_import_cred.patch
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Patch1: samba-v4.6-credentials-fix-realm.patch
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Patch2: samba-v4.6-lib-crypto-implement-samba.crypto-Python-module-for-.patch
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Requires(pre): /usr/sbin/groupadd
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Requires(post): systemd
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@ -2629,6 +2630,10 @@ rm -rf %{buildroot}
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%endif # with_clustering_support
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%changelog
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* Wed Mar 15 2017 Alexander Bokovoy <abokovoy@redhat.com> - 4.6.0-4
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- Export arcfour_crypt_blob to Python as samba.crypto.arcfour_encrypt
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- Makes possible to run trust to AD in FreeIPA in FIPS mode
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* Thu Mar 10 2017 Alexander Bokovoy <abokovoy@redhat.com> - 4.6.0-3
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- auth/credentials: Always set the the realm if we set the principal from the ccache
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- resolves: #1430761 - credentials_crb5: use gss_acquire_cred for client-side GSSAPI use case
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