mirror of
https://github.com/samba-team/samba.git
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5251d07e62
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
311 lines
8.2 KiB
C
311 lines
8.2 KiB
C
/*
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Unix SMB/CIFS implementation.
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Python interface to DCE/RPC library - utility functions.
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Copyright (C) 2010 Jelmer Vernooij <jelmer@samba.org>
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Copyright (C) 2010 Andrew Tridgell <tridge@samba.org>
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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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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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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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#include <Python.h>
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#include "includes.h"
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#include "librpc/rpc/pyrpc_util.h"
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#include "librpc/rpc/dcerpc.h"
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#include "librpc/rpc/pyrpc.h"
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#include "param/pyparam.h"
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#include "auth/credentials/pycredentials.h"
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#include "lib/events/events.h"
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#include "lib/messaging/messaging.h"
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#include "lib/messaging/irpc.h"
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bool py_check_dcerpc_type(PyObject *obj, const char *module, const char *type_name)
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{
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PyObject *mod;
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PyTypeObject *type;
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bool ret;
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mod = PyImport_ImportModule(module);
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if (mod == NULL) {
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PyErr_Format(PyExc_RuntimeError, "Unable to import %s to check type %s",
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module, type_name);
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return false;
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}
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type = (PyTypeObject *)PyObject_GetAttrString(mod, type_name);
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Py_DECREF(mod);
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if (type == NULL) {
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PyErr_Format(PyExc_RuntimeError, "Unable to find type %s in module %s",
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module, type_name);
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return false;
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}
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ret = PyObject_TypeCheck(obj, type);
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Py_DECREF(type);
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if (!ret)
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PyErr_Format(PyExc_TypeError, "Expected type %s.%s, got %s",
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module, type_name, Py_TYPE(obj)->tp_name);
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return ret;
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}
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/*
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connect to a IRPC pipe from python
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*/
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static NTSTATUS pyrpc_irpc_connect(TALLOC_CTX *mem_ctx, const char *irpc_server,
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const struct ndr_interface_table *table,
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struct tevent_context *event_ctx,
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struct loadparm_context *lp_ctx,
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struct dcerpc_binding_handle **binding_handle)
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{
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struct imessaging_context *msg;
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msg = imessaging_client_init(mem_ctx, lp_ctx, event_ctx);
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NT_STATUS_HAVE_NO_MEMORY(msg);
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*binding_handle = irpc_binding_handle_by_name(mem_ctx, msg, irpc_server, table);
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if (*binding_handle == NULL) {
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talloc_free(msg);
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return NT_STATUS_INVALID_PIPE_STATE;
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}
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return NT_STATUS_OK;
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}
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PyObject *py_dcerpc_interface_init_helper(PyTypeObject *type, PyObject *args, PyObject *kwargs,
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const struct ndr_interface_table *table)
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{
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dcerpc_InterfaceObject *ret;
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const char *binding_string;
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struct cli_credentials *credentials;
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struct loadparm_context *lp_ctx = NULL;
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PyObject *py_lp_ctx = Py_None, *py_credentials = Py_None, *py_basis = Py_None;
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TALLOC_CTX *mem_ctx = NULL;
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struct tevent_context *event_ctx;
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NTSTATUS status;
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const char *kwnames[] = {
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"binding", "lp_ctx", "credentials", "basis_connection", NULL
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};
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if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|OOO:samr", discard_const_p(char *, kwnames), &binding_string, &py_lp_ctx, &py_credentials, &py_basis)) {
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return NULL;
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}
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mem_ctx = talloc_new(NULL);
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if (mem_ctx == NULL) {
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PyErr_NoMemory();
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return NULL;
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}
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lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
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if (lp_ctx == NULL) {
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PyErr_SetString(PyExc_TypeError, "Expected loadparm context");
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talloc_free(mem_ctx);
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return NULL;
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}
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status = dcerpc_init();
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if (!NT_STATUS_IS_OK(status)) {
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PyErr_SetNTSTATUS(status);
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talloc_free(mem_ctx);
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return NULL;
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}
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ret = PyObject_New(dcerpc_InterfaceObject, type);
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ret->mem_ctx = mem_ctx;
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event_ctx = s4_event_context_init(ret->mem_ctx);
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if (strncmp(binding_string, "irpc:", 5) == 0) {
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ret->pipe = NULL;
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status = pyrpc_irpc_connect(ret->mem_ctx, binding_string+5, table,
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event_ctx, lp_ctx, &ret->binding_handle);
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} else if (py_basis != Py_None) {
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struct dcerpc_pipe *base_pipe;
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PyObject *py_base;
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PyTypeObject *ClientConnection_Type;
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py_base = PyImport_ImportModule("samba.dcerpc.base");
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if (py_base == NULL) {
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talloc_free(mem_ctx);
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return NULL;
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}
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ClientConnection_Type = (PyTypeObject *)PyObject_GetAttrString(py_base, "ClientConnection");
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if (ClientConnection_Type == NULL) {
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PyErr_SetNone(PyExc_TypeError);
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talloc_free(mem_ctx);
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return NULL;
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}
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if (!PyObject_TypeCheck(py_basis, ClientConnection_Type)) {
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PyErr_SetString(PyExc_TypeError, "basis_connection must be a DCE/RPC connection");
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talloc_free(mem_ctx);
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return NULL;
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}
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base_pipe = talloc_reference(mem_ctx, ((dcerpc_InterfaceObject *)py_basis)->pipe);
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status = dcerpc_secondary_context(base_pipe, &ret->pipe, table);
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ret->pipe = talloc_steal(ret->mem_ctx, ret->pipe);
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} else {
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credentials = cli_credentials_from_py_object(py_credentials);
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if (credentials == NULL) {
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PyErr_SetString(PyExc_TypeError, "Expected credentials");
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talloc_free(mem_ctx);
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return NULL;
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}
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status = dcerpc_pipe_connect(event_ctx, &ret->pipe, binding_string,
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table, credentials, event_ctx, lp_ctx);
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}
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if (NT_STATUS_IS_ERR(status)) {
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PyErr_SetNTSTATUS(status);
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talloc_free(mem_ctx);
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return NULL;
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}
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if (ret->pipe) {
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ret->pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
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ret->binding_handle = ret->pipe->binding_handle;
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}
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return (PyObject *)ret;
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}
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static PyObject *py_dcerpc_run_function(dcerpc_InterfaceObject *iface,
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const struct PyNdrRpcMethodDef *md,
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PyObject *args, PyObject *kwargs)
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{
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TALLOC_CTX *mem_ctx;
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NTSTATUS status;
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void *r;
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PyObject *result = Py_None;
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if (md->pack_in_data == NULL || md->unpack_out_data == NULL) {
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PyErr_SetString(PyExc_NotImplementedError, "No marshalling code available yet");
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return NULL;
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}
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mem_ctx = talloc_new(NULL);
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if (mem_ctx == NULL) {
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PyErr_NoMemory();
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return NULL;
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}
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r = talloc_zero_size(mem_ctx, md->table->calls[md->opnum].struct_size);
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if (r == NULL) {
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PyErr_NoMemory();
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return NULL;
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}
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if (!md->pack_in_data(args, kwargs, r)) {
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talloc_free(mem_ctx);
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return NULL;
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}
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status = md->call(iface->binding_handle, mem_ctx, r);
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if (!NT_STATUS_IS_OK(status)) {
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PyErr_SetDCERPCStatus(iface->pipe, status);
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talloc_free(mem_ctx);
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return NULL;
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}
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result = md->unpack_out_data(r);
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talloc_free(mem_ctx);
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return result;
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}
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static PyObject *py_dcerpc_call_wrapper(PyObject *self, PyObject *args, void *wrapped, PyObject *kwargs)
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{
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dcerpc_InterfaceObject *iface = (dcerpc_InterfaceObject *)self;
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const struct PyNdrRpcMethodDef *md = (const struct PyNdrRpcMethodDef *)wrapped;
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return py_dcerpc_run_function(iface, md, args, kwargs);
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}
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bool PyInterface_AddNdrRpcMethods(PyTypeObject *ifacetype, const struct PyNdrRpcMethodDef *mds)
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{
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int i;
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for (i = 0; mds[i].name; i++) {
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PyObject *ret;
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struct wrapperbase *wb = (struct wrapperbase *)calloc(sizeof(struct wrapperbase), 1);
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wb->name = discard_const_p(char, mds[i].name);
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wb->flags = PyWrapperFlag_KEYWORDS;
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wb->wrapper = (wrapperfunc)py_dcerpc_call_wrapper;
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wb->doc = discard_const_p(char, mds[i].doc);
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ret = PyDescr_NewWrapper(ifacetype, wb, discard_const_p(void, &mds[i]));
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PyDict_SetItemString(ifacetype->tp_dict, mds[i].name,
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(PyObject *)ret);
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}
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return true;
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}
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void PyErr_SetDCERPCStatus(struct dcerpc_pipe *p, NTSTATUS status)
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{
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if (p && NT_STATUS_EQUAL(status, NT_STATUS_NET_WRITE_FAULT)) {
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status = dcerpc_fault_to_nt_status(p->last_fault_code);
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}
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PyErr_SetNTSTATUS(status);
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}
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/*
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take a NDR structure that has a type in a python module and return
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it as a python object
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r is the NDR structure pointer (a C structure)
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r_ctx is the context that is a parent of r. It will be referenced by
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the resulting python object
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*/
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PyObject *py_return_ndr_struct(const char *module_name, const char *type_name,
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TALLOC_CTX *r_ctx, void *r)
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{
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PyTypeObject *py_type;
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PyObject *module;
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if (r == NULL) {
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Py_RETURN_NONE;
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}
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module = PyImport_ImportModule(module_name);
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if (module == NULL) {
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return NULL;
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}
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py_type = (PyTypeObject *)PyObject_GetAttrString(module, type_name);
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if (py_type == NULL) {
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return NULL;
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}
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return pytalloc_reference_ex(py_type, r_ctx, r);
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}
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PyObject *PyString_FromStringOrNULL(const char *str)
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{
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if (str == NULL) {
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Py_RETURN_NONE;
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}
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return PyString_FromString(str);
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}
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