samba-mirror/source4/auth/gensec/pygensec.c

/* 
   Unix SMB/CIFS implementation.
   Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2009
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "lib/replace/system/python.h"
#include "python/py3compat.h"
#include "includes.h"
#include "python/modules.h"
#include "param/pyparam.h"
#include "auth/gensec/gensec.h"
#include "auth/gensec/gensec_internal.h" /* TODO: remove this */
#include "auth/credentials/pycredentials.h"
#include "libcli/util/pyerrors.h"
#include "python/modules.h"
#include <pytalloc.h>
#include <tevent.h>
#include "librpc/rpc/pyrpc_util.h"

static PyObject *py_get_name_by_authtype(PyObject *self, PyObject *args)
{
	int type;
	const char *name;
	struct gensec_security *security;

	if (!PyArg_ParseTuple(args, "i", &type))
		return NULL;

	security = pytalloc_get_type(self, struct gensec_security);

	name = gensec_get_name_by_authtype(security, type);
	if (name == NULL)
		Py_RETURN_NONE;

	return PyUnicode_FromString(name);
}

static struct gensec_settings *settings_from_object(TALLOC_CTX *mem_ctx, PyObject *object)
{
	struct gensec_settings *s;
	PyObject *py_hostname, *py_lp_ctx;

	if (!PyDict_Check(object)) {
		PyErr_SetString(PyExc_ValueError, "settings should be a dictionary");
		return NULL;
	}

	s = talloc_zero(mem_ctx, struct gensec_settings);
	if (!s) return NULL;

	py_hostname = PyDict_GetItemString(object, "target_hostname");
	if (!py_hostname) {
		PyErr_SetString(PyExc_ValueError, "settings.target_hostname not found");
		return NULL;
	}

	py_lp_ctx = PyDict_GetItemString(object, "lp_ctx");
	if (!py_lp_ctx) {
		PyErr_SetString(PyExc_ValueError, "settings.lp_ctx not found");
		return NULL;
	}

	s->target_hostname = PyUnicode_AsUTF8(py_hostname);
	s->lp_ctx = lpcfg_from_py_object(s, py_lp_ctx);
	return s;
}

static PyObject *py_gensec_start_client(PyTypeObject *type, PyObject *args, PyObject *kwargs)
{
	NTSTATUS status;
	PyObject *self;
	struct gensec_settings *settings;
	const char *kwnames[] = { "settings", NULL };
	PyObject *py_settings = Py_None;
	struct gensec_security *gensec;
	TALLOC_CTX *frame;

	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|O", discard_const_p(char *, kwnames), &py_settings))
		return NULL;

	frame = talloc_stackframe();

	if (py_settings != Py_None) {
		settings = settings_from_object(frame, py_settings);
		if (settings == NULL) {
			PyErr_NoMemory();
			TALLOC_FREE(frame);
			return NULL;
		}
	} else {
		settings = talloc_zero(frame, struct gensec_settings);
		if (settings == NULL) {
			PyErr_NoMemory();
			TALLOC_FREE(frame);
			return NULL;
		}

		settings->lp_ctx = loadparm_init_global(true);
		if (settings->lp_ctx == NULL) {
			PyErr_NoMemory();
			TALLOC_FREE(frame);
			return NULL;
		}
	}

	status = gensec_init();
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		TALLOC_FREE(frame);
		return NULL;
	}

	status = gensec_client_start(frame, &gensec, settings);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		TALLOC_FREE(frame);
		return NULL;
	}

	self = pytalloc_steal(type, gensec);
	TALLOC_FREE(frame);

	return (PyObject *)self;
}

static PyObject *py_gensec_start_server(PyTypeObject *type, PyObject *args, PyObject *kwargs)
{
	NTSTATUS status;
	PyObject *self;
	struct gensec_settings *settings = NULL;
	const char *kwnames[] = { "settings", "auth_context", NULL };
	PyObject *py_settings = Py_None;
	PyObject *py_auth_context = Py_None;
	struct gensec_security *gensec;
	struct auth4_context *auth_context = NULL;
	TALLOC_CTX *frame;

	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|OO", discard_const_p(char *, kwnames), &py_settings, &py_auth_context))
		return NULL;

	frame = talloc_stackframe();

	if (py_settings != Py_None) {
		settings = settings_from_object(frame, py_settings);
		if (settings == NULL) {
			PyErr_NoMemory();
			TALLOC_FREE(frame);
			return NULL;
		}
	} else {
		settings = talloc_zero(frame, struct gensec_settings);
		if (settings == NULL) {
			PyErr_NoMemory();
			TALLOC_FREE(frame);
			return NULL;
		}

		settings->lp_ctx = loadparm_init_global(true);
		if (settings->lp_ctx == NULL) {
			PyErr_NoMemory();
			TALLOC_FREE(frame);
			return NULL;
		}
	}

	if (py_auth_context != Py_None) {
		bool ok = py_check_dcerpc_type(py_auth_context,
					       "samba.auth",
					       "AuthContext");
		if (!ok) {
			return NULL;
		}

		auth_context = pytalloc_get_type(py_auth_context,
						 struct auth4_context);
		if (!auth_context) {
			PyErr_Format(PyExc_TypeError,
				     "Expected auth.AuthContext for auth_context argument, got %s",
				     pytalloc_get_name(py_auth_context));
			return NULL;
		}
	}

	status = gensec_init();
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		TALLOC_FREE(frame);
		return NULL;
	}

	status = gensec_server_start(frame, settings, auth_context, &gensec);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		TALLOC_FREE(frame);
		return NULL;
	}

	self = pytalloc_steal(type, gensec);
	TALLOC_FREE(frame);

	return self;
}

static PyObject *py_gensec_set_target_hostname(PyObject *self, PyObject *args)
{
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	char *target_hostname;
	NTSTATUS status;

	if (!PyArg_ParseTuple(args, "s", &target_hostname))
		return NULL;

	status = gensec_set_target_hostname(security, target_hostname);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		return NULL;
	}
	
	Py_RETURN_NONE;
}

static PyObject *py_gensec_set_target_service(PyObject *self, PyObject *args)
{
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	char *target_service;
	NTSTATUS status;

	if (!PyArg_ParseTuple(args, "s", &target_service))
		return NULL;

	status = gensec_set_target_service(security, target_service);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		return NULL;
	}
	
	Py_RETURN_NONE;
}

static PyObject *py_gensec_set_target_service_description(PyObject *self, PyObject *args)
{
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	char *target_service_description;
	NTSTATUS status;

	if (!PyArg_ParseTuple(args, "s", &target_service_description))
		return NULL;

	status = gensec_set_target_service_description(security,
						       target_service_description);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		return NULL;
	}

	Py_RETURN_NONE;
}

static PyObject *py_gensec_set_credentials(PyObject *self, PyObject *args)
{
	PyObject *py_creds = Py_None;
	struct cli_credentials *creds;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	NTSTATUS status;

	if (!PyArg_ParseTuple(args, "O", &py_creds))
		return NULL;

	creds = PyCredentials_AsCliCredentials(py_creds);
	if (!creds) {
		PyErr_Format(
			PyExc_TypeError,
			"Expected samba.credentials for credentials argument, "
			"got %s", pytalloc_get_name(py_creds));
		return NULL;
	}

	status = gensec_set_credentials(security, creds);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		return NULL;
	}

	Py_RETURN_NONE;
}

static PyObject *py_gensec_session_info(PyObject *self,
		PyObject *Py_UNUSED(ignored))
{
	TALLOC_CTX *mem_ctx;
	NTSTATUS status;
	PyObject *py_session_info;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	struct auth_session_info *info;
	if (security->ops == NULL) {
		PyErr_SetString(PyExc_RuntimeError, "no mechanism selected");
		return NULL;
	}
	mem_ctx = talloc_new(NULL);
	if (mem_ctx == NULL) {
		return PyErr_NoMemory();
	}

	status = gensec_session_info(security, mem_ctx, &info);
	if (NT_STATUS_IS_ERR(status)) {
		talloc_free(mem_ctx);
		PyErr_SetNTSTATUS(status);
		return NULL;
	}

	py_session_info = py_return_ndr_struct("samba.dcerpc.auth", "session_info",
						 info, info);
	talloc_free(mem_ctx);
	return py_session_info;
}

static PyObject *py_gensec_session_key(PyObject *self,
		PyObject *Py_UNUSED(ignored))
{
	TALLOC_CTX *mem_ctx;
	NTSTATUS status;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	DATA_BLOB session_key = data_blob_null;
	static PyObject *session_key_obj = NULL;

	if (security->ops == NULL) {
		PyErr_SetString(PyExc_RuntimeError, "no mechanism selected");
		return NULL;
	}
	mem_ctx = talloc_new(NULL);
	if (mem_ctx == NULL) {
		return PyErr_NoMemory();
	}

	status = gensec_session_key(security, mem_ctx, &session_key);
	if (!NT_STATUS_IS_OK(status)) {
		talloc_free(mem_ctx);
		PyErr_SetNTSTATUS(status);
		return NULL;
	}

	session_key_obj = PyBytes_FromStringAndSize((const char *)session_key.data,
						     session_key.length);
	talloc_free(mem_ctx);
	return session_key_obj;
}

static PyObject *py_gensec_start_mech_by_name(PyObject *self, PyObject *args)
{
	char *name;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	NTSTATUS status;

	if (!PyArg_ParseTuple(args, "s", &name))
		return NULL;

	status = gensec_start_mech_by_name(security, name);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		return NULL;
	}

	Py_RETURN_NONE;
}

static PyObject *py_gensec_start_mech_by_sasl_name(PyObject *self, PyObject *args)
{
	char *sasl_name;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	NTSTATUS status;

	if (!PyArg_ParseTuple(args, "s", &sasl_name))
		return NULL;

	status = gensec_start_mech_by_sasl_name(security, sasl_name);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		return NULL;
	}

	Py_RETURN_NONE;
}

static PyObject *py_gensec_start_mech_by_authtype(PyObject *self, PyObject *args)
{
	int authtype, level;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	NTSTATUS status;
	if (!PyArg_ParseTuple(args, "ii", &authtype, &level))
		return NULL;

	status = gensec_start_mech_by_authtype(security, authtype, level);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		return NULL;
	}

	Py_RETURN_NONE;
}

static PyObject *py_gensec_want_feature(PyObject *self, PyObject *args)
{
	int feature;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	/* This is i (and declared as an int above) by design, as they are handled as an integer in python */
	if (!PyArg_ParseTuple(args, "i", &feature))
		return NULL;

	gensec_want_feature(security, feature);

	Py_RETURN_NONE;
}

static PyObject *py_gensec_have_feature(PyObject *self, PyObject *args)
{
	int feature;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	/* This is i (and declared as an int above) by design, as they are handled as an integer in python */
	if (!PyArg_ParseTuple(args, "i", &feature))
		return NULL;

	if (gensec_have_feature(security, feature)) {
		Py_RETURN_TRUE;
	} 
	Py_RETURN_FALSE;
}

static PyObject *py_gensec_set_max_update_size(PyObject *self, PyObject *args)
{
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	unsigned int max_update_size = 0;

	if (!PyArg_ParseTuple(args, "I", &max_update_size))
		return NULL;

	gensec_set_max_update_size(security, max_update_size);

	Py_RETURN_NONE;
}

static PyObject *py_gensec_max_update_size(PyObject *self,
		PyObject *Py_UNUSED(ignored))
{
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	unsigned int max_update_size = gensec_max_update_size(security);

	return PyLong_FromLong(max_update_size);
}

static PyObject *py_gensec_update(PyObject *self, PyObject *args)
{
	NTSTATUS status;
	TALLOC_CTX *mem_ctx;
	DATA_BLOB in, out;
	PyObject *py_bytes, *result, *py_in;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	PyObject *finished_processing;
	char *data = NULL;
	Py_ssize_t len;
	int err;

	if (!PyArg_ParseTuple(args, "O", &py_in))
		return NULL;

	mem_ctx = talloc_new(NULL);
	if (mem_ctx == NULL) {
		return PyErr_NoMemory();
	}

	err = PyBytes_AsStringAndSize(py_in, &data, &len);
	if (err) {
		talloc_free(mem_ctx);
		return NULL;
	}

	/*
	 * Make a copy of the input buffer, as gensec_update may modify its
	 * input argument.
	 */
	in = data_blob_talloc(mem_ctx, data, len);
	if (!in.data) {
		talloc_free(mem_ctx);
		return PyErr_NoMemory();
	}

	status = gensec_update(security, mem_ctx, in, &out);

	if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)
	    && !NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		talloc_free(mem_ctx);
		return NULL;
	}
	py_bytes = PyBytes_FromStringAndSize((const char *)out.data,
					     out.length);
	talloc_free(mem_ctx);

	if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		finished_processing = Py_False;
	} else {
		finished_processing = Py_True;
	}

	result = PyTuple_Pack(2, finished_processing, py_bytes);
	Py_XDECREF(py_bytes);
	return result;
}

static PyObject *py_gensec_wrap(PyObject *self, PyObject *args)
{
	NTSTATUS status;

	TALLOC_CTX *mem_ctx;
	DATA_BLOB in, out;
	PyObject *ret, *py_in;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);

	if (!PyArg_ParseTuple(args, "O", &py_in))
		return NULL;

	mem_ctx = talloc_new(NULL);
	if (mem_ctx == NULL) {
		return PyErr_NoMemory();
	}

	if (!PyBytes_Check(py_in)) {
		talloc_free(mem_ctx);
		PyErr_Format(PyExc_TypeError, "bytes expected");
		return NULL;
	}
	in.data = (uint8_t *)PyBytes_AsString(py_in);
	in.length = PyBytes_Size(py_in);

	status = gensec_wrap(security, mem_ctx, &in, &out);

	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		talloc_free(mem_ctx);
		return NULL;
	}

	ret = PyBytes_FromStringAndSize((const char *)out.data, out.length);
	talloc_free(mem_ctx);
	return ret;
}


static PyObject *py_gensec_unwrap(PyObject *self, PyObject *args)
{
	NTSTATUS status;

	TALLOC_CTX *mem_ctx;
	DATA_BLOB in, out;
	PyObject *ret, *py_in;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	char *data = NULL;
	Py_ssize_t len;
	int err;

	if (!PyArg_ParseTuple(args, "O", &py_in))
		return NULL;

	mem_ctx = talloc_new(NULL);
	if (mem_ctx == NULL) {
		return PyErr_NoMemory();
	}

	err = PyBytes_AsStringAndSize(py_in, &data, &len);
	if (err) {
		talloc_free(mem_ctx);
		return NULL;
	}

	/*
	 * Make a copy of the input buffer, as gensec_unwrap may modify its
	 * input argument.
	 */
	in = data_blob_talloc(mem_ctx, data, len);
	if (!in.data) {
		talloc_free(mem_ctx);
		return PyErr_NoMemory();
	}

	status = gensec_unwrap(security, mem_ctx, &in, &out);

	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		talloc_free(mem_ctx);
		return NULL;
	}

	ret = PyBytes_FromStringAndSize((const char *)out.data, out.length);
	talloc_free(mem_ctx);
	return ret;
}

static PyObject *py_gensec_sig_size(PyObject *self, PyObject *args)
{
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);
	Py_ssize_t data_size = 0;
	size_t sig_size = 0;

	if (!PyArg_ParseTuple(args, "n", &data_size)) {
		return NULL;
	}

	sig_size = gensec_sig_size(security, data_size);

	return PyLong_FromSize_t(sig_size);
}

static PyObject *py_gensec_sign_packet(PyObject *self, PyObject *args)
{
	NTSTATUS status;
	TALLOC_CTX *mem_ctx = NULL;
	Py_ssize_t data_length = 0;
	Py_ssize_t pdu_length = 0;
	DATA_BLOB data, pdu, sig;
	PyObject *py_sig;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);

	if (!PyArg_ParseTuple(args, "z#z#", &data.data, &data_length, &pdu.data, &pdu_length)) {
		return NULL;
	}
	data.length = data_length;
	pdu.length = pdu_length;

	mem_ctx = talloc_new(NULL);
	if (mem_ctx == NULL) {
		return PyErr_NoMemory();
	}

	status = gensec_sign_packet(security, mem_ctx,
				    data.data, data.length,
				    pdu.data, pdu.length, &sig);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		talloc_free(mem_ctx);
		return NULL;
	}

	py_sig = PyBytes_FromStringAndSize((const char *)sig.data, sig.length);
	talloc_free(mem_ctx);
	return py_sig;
}

static PyObject *py_gensec_check_packet(PyObject *self, PyObject *args)
{
	NTSTATUS status;
	Py_ssize_t data_length = 0;
	Py_ssize_t pdu_length = 0;
	Py_ssize_t sig_length = 0;
	DATA_BLOB data, pdu, sig;
	struct gensec_security *security = pytalloc_get_type(self, struct gensec_security);

	if (!PyArg_ParseTuple(args, "z#z#z#",
			      &data.data, &data_length,
			      &pdu.data, &pdu_length,
			      &sig.data, &sig_length)) {
		return NULL;
	}
	data.length = data_length;
	pdu.length = pdu_length;
	sig.length = sig_length;

	status = gensec_check_packet(security,
				     data.data, data.length,
				     pdu.data, pdu.length, &sig);
	if (!NT_STATUS_IS_OK(status)) {
		PyErr_SetNTSTATUS(status);
		return NULL;
	}

	Py_RETURN_NONE;
}

static PyMethodDef py_gensec_security_methods[] = {
	{ "start_client", PY_DISCARD_FUNC_SIG(PyCFunction,
					      py_gensec_start_client),
		METH_VARARGS|METH_KEYWORDS|METH_CLASS,
		"S.start_client(settings) -> gensec" },
	{ "start_server", PY_DISCARD_FUNC_SIG(PyCFunction,
					      py_gensec_start_server),
		METH_VARARGS|METH_KEYWORDS|METH_CLASS,
		"S.start_server(auth_ctx, settings) -> gensec" },
	{ "set_credentials", (PyCFunction)py_gensec_set_credentials, METH_VARARGS, 
		"S.set_credentials(credentials)" },
	{ "set_target_hostname", (PyCFunction)py_gensec_set_target_hostname, METH_VARARGS, 
		"S.set_target_hostname(target_hostname) \n This sets the Kerberos target hostname to obtain a ticket for." },
	{ "set_target_service", (PyCFunction)py_gensec_set_target_service, METH_VARARGS, 
		"S.set_target_service(target_service) \n This sets the Kerberos target service to obtain a ticket for.  The default value is 'host'" },
	{ "set_target_service_description", (PyCFunction)py_gensec_set_target_service_description, METH_VARARGS,
		"S.set_target_service_description(target_service_description) \n This description is set server-side and used in authentication and authorization logs.  The default value is that provided to set_target_service() or None."},
	{ "session_info", (PyCFunction)py_gensec_session_info, METH_NOARGS,
		"S.session_info() -> info" },
	{ "session_key", (PyCFunction)py_gensec_session_key, METH_NOARGS,
		"S.session_key() -> key" },
	{ "start_mech_by_name", (PyCFunction)py_gensec_start_mech_by_name, METH_VARARGS,
		"S.start_mech_by_name(name)" },
	{ "start_mech_by_sasl_name", (PyCFunction)py_gensec_start_mech_by_sasl_name, METH_VARARGS,
		"S.start_mech_by_sasl_name(name)" },
	{ "start_mech_by_authtype", (PyCFunction)py_gensec_start_mech_by_authtype, METH_VARARGS,
		"S.start_mech_by_authtype(authtype, level)" },
	{ "get_name_by_authtype", (PyCFunction)py_get_name_by_authtype, METH_VARARGS,
		"S.get_name_by_authtype(authtype) -> name\nLookup an auth type." },
	{ "want_feature", (PyCFunction)py_gensec_want_feature, METH_VARARGS,
		"S.want_feature(feature)\n Request that GENSEC negotiate a particular feature." },
	{ "have_feature", (PyCFunction)py_gensec_have_feature, METH_VARARGS,
		"S.have_feature()\n Return True if GENSEC negotiated a particular feature." },
	{ "set_max_update_size",  (PyCFunction)py_gensec_set_max_update_size, METH_VARARGS,
		"S.set_max_update_size(max_size) \n Some mechs can fragment update packets, needs to be use before the mech is started." },
	{ "max_update_size",  (PyCFunction)py_gensec_max_update_size, METH_NOARGS,
		"S.max_update_size() \n Return the current max_update_size." },
	{ "update",  (PyCFunction)py_gensec_update, METH_VARARGS,
		"S.update(blob_in) -> (finished, blob_out)\nPerform one step in a GENSEC dance.  Repeat with new packets until finished is true or exception." },
	{ "wrap",  (PyCFunction)py_gensec_wrap, METH_VARARGS,
		"S.wrap(blob_in) -> blob_out\nPackage one clear packet into a wrapped GENSEC packet." },
	{ "unwrap",  (PyCFunction)py_gensec_unwrap, METH_VARARGS,
		"S.unwrap(blob_in) -> blob_out\nPerform one wrapped GENSEC packet into a clear packet." },
	{ "sig_size",  (PyCFunction)py_gensec_sig_size, METH_VARARGS,
		"S.sig_size(data_size) -> sig_size\nSize of the DCERPC packet signature" },
	{ "sign_packet",  (PyCFunction)py_gensec_sign_packet, METH_VARARGS,
		"S.sign_packet(data, whole_pdu) -> sig\nSign a DCERPC packet." },
	{ "check_packet",  (PyCFunction)py_gensec_check_packet, METH_VARARGS,
		"S.check_packet(data, whole_pdu, sig)\nCheck a DCERPC packet." },
	{0}
};

static struct PyModuleDef moduledef = {
    PyModuleDef_HEAD_INIT,
    .m_name = "gensec",
    .m_doc = "Generic Security Interface.",
    .m_size = -1,
};

static PyTypeObject Py_Security = {
	.tp_name = "gensec.Security",
	.tp_flags = Py_TPFLAGS_DEFAULT,
	.tp_methods = py_gensec_security_methods,
};

MODULE_INIT_FUNC(gensec)
{
	PyObject *m;

	if (pytalloc_BaseObject_PyType_Ready(&Py_Security) < 0)
		return NULL;

	m = PyModule_Create(&moduledef);
	if (m == NULL)
		return NULL;

	PyModule_AddObject(m, "FEATURE_SESSION_KEY",     PyLong_FromLong(GENSEC_FEATURE_SESSION_KEY));
	PyModule_AddObject(m, "FEATURE_SIGN",            PyLong_FromLong(GENSEC_FEATURE_SIGN));
	PyModule_AddObject(m, "FEATURE_SEAL",            PyLong_FromLong(GENSEC_FEATURE_SEAL));
	PyModule_AddObject(m, "FEATURE_DCE_STYLE",       PyLong_FromLong(GENSEC_FEATURE_DCE_STYLE));
	PyModule_AddObject(m, "FEATURE_ASYNC_REPLIES",   PyLong_FromLong(GENSEC_FEATURE_ASYNC_REPLIES));
	PyModule_AddObject(m, "FEATURE_DATAGRAM_MODE",   PyLong_FromLong(GENSEC_FEATURE_DATAGRAM_MODE));
	PyModule_AddObject(m, "FEATURE_SIGN_PKT_HEADER", PyLong_FromLong(GENSEC_FEATURE_SIGN_PKT_HEADER));
	PyModule_AddObject(m, "FEATURE_NEW_SPNEGO",      PyLong_FromLong(GENSEC_FEATURE_NEW_SPNEGO));

	Py_INCREF(&Py_Security);
	PyModule_AddObject(m, "Security", (PyObject *)&Py_Security);

	return m;
}