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-rw-r--r--source4/librpc/rpc/pyrpc_util.c555
1 files changed, 555 insertions, 0 deletions
diff --git a/source4/librpc/rpc/pyrpc_util.c b/source4/librpc/rpc/pyrpc_util.c
new file mode 100644
index 0000000..43c29af
--- /dev/null
+++ b/source4/librpc/rpc/pyrpc_util.c
@@ -0,0 +1,555 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ Python interface to DCE/RPC library - utility functions.
+
+ Copyright (C) 2010 Jelmer Vernooij <jelmer@samba.org>
+ Copyright (C) 2010 Andrew Tridgell <tridge@samba.org>
+
+ 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 "librpc/rpc/pyrpc_util.h"
+#include "librpc/rpc/dcerpc.h"
+#include "librpc/rpc/pyrpc.h"
+#include "param/pyparam.h"
+#include "auth/credentials/pycredentials.h"
+#include "lib/events/events.h"
+#include "lib/messaging/messaging.h"
+#include "lib/messaging/irpc.h"
+
+bool py_check_dcerpc_type(PyObject *obj, const char *module, const char *type_name)
+{
+ PyObject *mod;
+ PyTypeObject *type;
+ bool ret;
+
+ mod = PyImport_ImportModule(module);
+
+ if (mod == NULL) {
+ PyErr_Format(PyExc_RuntimeError, "Unable to import %s to check type %s",
+ module, type_name);
+ return false;
+ }
+
+ type = (PyTypeObject *)PyObject_GetAttrString(mod, type_name);
+ Py_DECREF(mod);
+ if (type == NULL) {
+ PyErr_Format(PyExc_RuntimeError, "Unable to find type %s in module %s",
+ module, type_name);
+ return false;
+ }
+
+ ret = PyObject_TypeCheck(obj, type);
+ Py_DECREF(type);
+
+ if (!ret)
+ PyErr_Format(PyExc_TypeError, "Expected type %s.%s, got %s",
+ module, type_name, Py_TYPE(obj)->tp_name);
+
+ return ret;
+}
+
+/*
+ connect to a IRPC pipe from python
+ */
+static NTSTATUS pyrpc_irpc_connect(TALLOC_CTX *mem_ctx, const char *irpc_server,
+ const struct ndr_interface_table *table,
+ struct tevent_context *event_ctx,
+ struct loadparm_context *lp_ctx,
+ struct dcerpc_binding_handle **binding_handle)
+{
+ struct imessaging_context *msg;
+
+ msg = imessaging_client_init(mem_ctx, lp_ctx, event_ctx);
+ NT_STATUS_HAVE_NO_MEMORY(msg);
+
+ *binding_handle = irpc_binding_handle_by_name(mem_ctx, msg, irpc_server, table);
+ if (*binding_handle == NULL) {
+ talloc_free(msg);
+ return NT_STATUS_INVALID_PIPE_STATE;
+ }
+
+ /*
+ * Note: this allows nested event loops to happen,
+ * but as there's no top level event loop it's not that critical.
+ */
+ dcerpc_binding_handle_set_sync_ev(*binding_handle, event_ctx);
+
+ return NT_STATUS_OK;
+}
+
+PyObject *py_dcerpc_interface_init_helper(PyTypeObject *type, PyObject *args, PyObject *kwargs,
+ const struct ndr_interface_table *table)
+{
+ dcerpc_InterfaceObject *ret;
+ const char *binding_string;
+ PyObject *py_lp_ctx = Py_None, *py_credentials = Py_None, *py_basis = Py_None;
+ NTSTATUS status;
+ unsigned int timeout = (unsigned int)-1;
+ const char *kwnames[] = {
+ "binding", "lp_ctx", "credentials", "timeout", "basis_connection", NULL
+ };
+
+ if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|OOIO:samr", discard_const_p(char *, kwnames), &binding_string, &py_lp_ctx, &py_credentials, &timeout, &py_basis)) {
+ return NULL;
+ }
+
+ status = dcerpc_init();
+ if (!NT_STATUS_IS_OK(status)) {
+ PyErr_SetNTSTATUS(status);
+ return NULL;
+ }
+
+ ret = PyObject_New(dcerpc_InterfaceObject, type);
+ if (ret == NULL) {
+ PyErr_NoMemory();
+ return NULL;
+ }
+
+ ret->pipe = NULL;
+ ret->binding_handle = NULL;
+ ret->ev = NULL;
+ ret->mem_ctx = talloc_new(NULL);
+ if (ret->mem_ctx == NULL) {
+ PyErr_NoMemory();
+ return NULL;
+ }
+
+ if (strncmp(binding_string, "irpc:", 5) == 0) {
+ struct loadparm_context *lp_ctx;
+
+ ret->ev = s4_event_context_init(ret->mem_ctx);
+ if (ret->ev == NULL) {
+ PyErr_SetString(PyExc_TypeError,
+ "Unable to initialise event context");
+ Py_DECREF(ret);
+ return NULL;
+ }
+
+ lp_ctx = lpcfg_from_py_object(ret->ev, py_lp_ctx);
+ if (lp_ctx == NULL) {
+ PyErr_SetString(PyExc_TypeError, "Expected loadparm context");
+ Py_DECREF(ret);
+ return NULL;
+ }
+
+ status = pyrpc_irpc_connect(ret->mem_ctx, binding_string+5, table,
+ ret->ev, lp_ctx, &ret->binding_handle);
+ if (!NT_STATUS_IS_OK(status)) {
+ PyErr_SetNTSTATUS(status);
+ Py_DECREF(ret);
+ return NULL;
+ }
+ } else if (py_basis != Py_None) {
+ struct dcerpc_pipe *base_pipe;
+ PyObject *py_base;
+ PyTypeObject *ClientConnection_Type;
+
+ py_base = PyImport_ImportModule("samba.dcerpc.base");
+ if (py_base == NULL) {
+ Py_DECREF(ret);
+ return NULL;
+ }
+
+ ClientConnection_Type = (PyTypeObject *)PyObject_GetAttrString(py_base, "ClientConnection");
+ if (ClientConnection_Type == NULL) {
+ PyErr_SetNone(PyExc_TypeError);
+ Py_DECREF(ret);
+ Py_DECREF(py_base);
+ return NULL;
+ }
+
+ if (!PyObject_TypeCheck(py_basis, ClientConnection_Type)) {
+ PyErr_SetString(PyExc_TypeError, "basis_connection must be a DCE/RPC connection");
+ Py_DECREF(ret);
+ Py_DECREF(py_base);
+ Py_DECREF(ClientConnection_Type);
+ return NULL;
+ }
+
+ base_pipe = talloc_reference(ret->mem_ctx,
+ ((dcerpc_InterfaceObject *)py_basis)->pipe);
+ if (base_pipe == NULL) {
+ PyErr_NoMemory();
+ Py_DECREF(ret);
+ Py_DECREF(py_base);
+ Py_DECREF(ClientConnection_Type);
+ return NULL;
+ }
+
+ ret->ev = talloc_reference(
+ ret->mem_ctx,
+ ((dcerpc_InterfaceObject *)py_basis)->ev);
+ if (ret->ev == NULL) {
+ PyErr_NoMemory();
+ Py_DECREF(ret);
+ Py_DECREF(py_base);
+ Py_DECREF(ClientConnection_Type);
+ return NULL;
+ }
+
+ status = dcerpc_secondary_context(base_pipe, &ret->pipe, table);
+ if (!NT_STATUS_IS_OK(status)) {
+ PyErr_SetNTSTATUS(status);
+ Py_DECREF(ret);
+ Py_DECREF(py_base);
+ Py_DECREF(ClientConnection_Type);
+ return NULL;
+ }
+
+ ret->pipe = talloc_steal(ret->mem_ctx, ret->pipe);
+ Py_XDECREF(ClientConnection_Type);
+ Py_XDECREF(py_base);
+ } else {
+ struct loadparm_context *lp_ctx;
+ struct cli_credentials *credentials;
+
+ ret->ev = s4_event_context_init(ret->mem_ctx);
+ if (ret->ev == NULL) {
+ PyErr_SetString(PyExc_TypeError, "Expected loadparm context");
+ Py_DECREF(ret);
+ return NULL;
+ }
+
+ lp_ctx = lpcfg_from_py_object(ret->ev, py_lp_ctx);
+ if (lp_ctx == NULL) {
+ PyErr_SetString(PyExc_TypeError, "Expected loadparm context");
+ Py_DECREF(ret);
+ return NULL;
+ }
+
+ credentials = cli_credentials_from_py_object(py_credentials);
+ if (credentials == NULL) {
+ PyErr_SetString(PyExc_TypeError, "Expected credentials");
+ Py_DECREF(ret);
+ return NULL;
+ }
+ status = dcerpc_pipe_connect(ret->mem_ctx, &ret->pipe, binding_string,
+ table, credentials, ret->ev, lp_ctx);
+ if (!NT_STATUS_IS_OK(status)) {
+ PyErr_SetNTSTATUS(status);
+ Py_DECREF(ret);
+ return NULL;
+ }
+ }
+
+ if (ret->pipe) {
+ ret->pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
+ ret->binding_handle = ret->pipe->binding_handle;
+ }
+
+ /* reset timeout for the handle */
+ if ((timeout != ((unsigned int)-1)) && (ret->binding_handle != NULL)) {
+ dcerpc_binding_handle_set_timeout(ret->binding_handle, timeout);
+ }
+
+ return (PyObject *)ret;
+}
+
+static PyObject *py_dcerpc_run_function(dcerpc_InterfaceObject *iface,
+ const struct PyNdrRpcMethodDef *md,
+ PyObject *args, PyObject *kwargs)
+{
+ TALLOC_CTX *mem_ctx;
+ NTSTATUS status;
+ void *r;
+ PyObject *result = Py_None;
+
+ if (md->pack_in_data == NULL || md->unpack_out_data == NULL) {
+ PyErr_SetString(PyExc_NotImplementedError, "No marshalling code available yet");
+ return NULL;
+ }
+
+ mem_ctx = talloc_new(NULL);
+ if (mem_ctx == NULL) {
+ PyErr_NoMemory();
+ return NULL;
+ }
+
+ r = talloc_zero_size(mem_ctx, md->table->calls[md->opnum].struct_size);
+ if (r == NULL) {
+ PyErr_NoMemory();
+ return NULL;
+ }
+
+ if (!md->pack_in_data(args, kwargs, r)) {
+ talloc_free(mem_ctx);
+ return NULL;
+ }
+
+ status = md->call(iface->binding_handle, mem_ctx, r);
+ if (!NT_STATUS_IS_OK(status)) {
+ PyErr_SetDCERPCStatus(iface->pipe, status);
+ talloc_free(mem_ctx);
+ return NULL;
+ }
+
+ result = md->unpack_out_data(r);
+
+ talloc_free(mem_ctx);
+ return result;
+}
+
+static PyObject *py_dcerpc_call_wrapper(PyObject *self, PyObject *args, void *wrapped, PyObject *kwargs)
+{
+ dcerpc_InterfaceObject *iface = (dcerpc_InterfaceObject *)self;
+ const struct PyNdrRpcMethodDef *md = (const struct PyNdrRpcMethodDef *)wrapped;
+
+ return py_dcerpc_run_function(iface, md, args, kwargs);
+}
+
+bool PyInterface_AddNdrRpcMethods(PyTypeObject *ifacetype, const struct PyNdrRpcMethodDef *mds)
+{
+ int i;
+ for (i = 0; mds[i].name; i++) {
+ PyObject *ret;
+ struct wrapperbase *wb = (struct wrapperbase *)calloc(sizeof(struct wrapperbase), 1);
+
+ if (wb == NULL) {
+ return false;
+ }
+ wb->name = discard_const_p(char, mds[i].name);
+ wb->flags = PyWrapperFlag_KEYWORDS;
+ wb->wrapper = PY_DISCARD_FUNC_SIG(wrapperfunc,
+ py_dcerpc_call_wrapper);
+ wb->doc = discard_const_p(char, mds[i].doc);
+
+ ret = PyDescr_NewWrapper(ifacetype, wb, discard_const_p(void, &mds[i]));
+
+ PyDict_SetItemString(ifacetype->tp_dict, mds[i].name,
+ (PyObject *)ret);
+ Py_CLEAR(ret);
+ }
+
+ return true;
+}
+
+PyObject *py_dcerpc_syntax_init_helper(PyTypeObject *type, PyObject *args, PyObject *kwargs,
+ const struct ndr_syntax_id *syntax)
+{
+ PyObject *ret;
+ struct ndr_syntax_id *obj;
+ const char *kwnames[] = { NULL };
+
+ if (!PyArg_ParseTupleAndKeywords(args, kwargs, ":abstract_syntax", discard_const_p(char *, kwnames))) {
+ return NULL;
+ }
+
+ ret = pytalloc_new(struct ndr_syntax_id, type);
+ if (ret == NULL) {
+ return NULL;
+ }
+
+ obj = pytalloc_get_type(ret, struct ndr_syntax_id);
+ *obj = *syntax;
+
+ return ret;
+}
+
+void PyErr_SetDCERPCStatus(struct dcerpc_pipe *p, NTSTATUS status)
+{
+ if (p && NT_STATUS_EQUAL(status, NT_STATUS_NET_WRITE_FAULT)) {
+ status = dcerpc_fault_to_nt_status(p->last_fault_code);
+ }
+ PyErr_SetNTSTATUS(status);
+}
+
+
+/*
+ take a NDR structure that has a type in a python module and return
+ it as a python object
+
+ r is the NDR structure pointer (a C structure)
+
+ r_ctx is the context that is a parent of r. It will be referenced by
+ the resulting python object
+
+ This MUST only be used by objects that are based on pytalloc_Object
+ otherwise the pytalloc_reference_ex() will fail.
+ */
+PyObject *py_return_ndr_struct(const char *module_name, const char *type_name,
+ TALLOC_CTX *r_ctx, void *r)
+{
+ PyTypeObject *py_type;
+ PyObject *module;
+ PyObject *result = NULL;
+
+ if (r == NULL) {
+ Py_RETURN_NONE;
+ }
+
+ module = PyImport_ImportModule(module_name);
+ if (module == NULL) {
+ return NULL;
+ }
+
+ py_type = (PyTypeObject *)PyObject_GetAttrString(module, type_name);
+ if (py_type == NULL) {
+ Py_DECREF(module);
+ return NULL;
+ }
+
+ result = pytalloc_reference_ex(py_type, r_ctx, r);
+ Py_CLEAR(module);
+ Py_CLEAR(py_type);
+ return result;
+}
+
+PyObject *PyString_FromStringOrNULL(const char *str)
+{
+ if (str == NULL) {
+ Py_RETURN_NONE;
+ }
+ return PyUnicode_FromString(str);
+}
+
+PyObject *PyBytes_FromUtf16StringOrNULL(const unsigned char *str)
+{
+ size_t len;
+
+ if (str == NULL) {
+ Py_RETURN_NONE;
+ }
+
+ len = utf16_len(str);
+ return PyBytes_FromStringAndSize((const char *)str, len);
+}
+
+unsigned char *PyUtf16String_FromBytes(TALLOC_CTX *mem_ctx, PyObject *value)
+{
+ char *bytes = NULL;
+ Py_ssize_t len = 0;
+ unsigned char *utf16_string = NULL;
+ int ret;
+
+ ret = PyBytes_AsStringAndSize(value, &bytes, &len);
+ if (ret) {
+ return NULL;
+ }
+
+ if (len < 0) {
+ PyErr_SetString(PyExc_ValueError, "bytes length is negative");
+ return NULL;
+ }
+ if (len & 1) {
+ PyErr_SetString(PyExc_ValueError, "bytes length is odd");
+ return NULL;
+ }
+
+ /* Ensure that the bytes object contains no embedded null terminator. */
+ if ((size_t)len != utf16_len_n(bytes, len)) {
+ PyErr_SetString(PyExc_ValueError,
+ "value contains an embedded null terminator");
+ return NULL;
+ }
+
+ utf16_string = talloc_utf16_strlendup(mem_ctx, bytes, len);
+ if (utf16_string == NULL) {
+ PyErr_NoMemory();
+ return NULL;
+ }
+
+ return utf16_string;
+}
+
+PyObject *pyrpc_import_union(PyTypeObject *type, TALLOC_CTX *mem_ctx, int level,
+ const void *in, const char *typename)
+{
+ PyObject *mem_ctx_obj = NULL;
+ PyObject *in_obj = NULL;
+ PyObject *ret = NULL;
+
+ mem_ctx_obj = pytalloc_GenericObject_reference(mem_ctx);
+ if (mem_ctx_obj == NULL) {
+ return NULL;
+ }
+
+ in_obj = pytalloc_GenericObject_reference_ex(mem_ctx, discard_const(in));
+ if (in_obj == NULL) {
+ Py_XDECREF(mem_ctx_obj);
+ return NULL;
+ }
+
+ ret = PyObject_CallMethod((PyObject *)type,
+ discard_const_p(char, "__import__"),
+ discard_const_p(char, "OiO"),
+ mem_ctx_obj, level, in_obj);
+ Py_XDECREF(mem_ctx_obj);
+ Py_XDECREF(in_obj);
+ if (ret == NULL) {
+ return NULL;
+ }
+
+ return ret;
+}
+
+void *pyrpc_export_union(PyTypeObject *type, TALLOC_CTX *mem_ctx, int level,
+ PyObject *in, const char *typename)
+{
+ PyObject *mem_ctx_obj = NULL;
+ PyObject *ret_obj = NULL;
+ void *ret = NULL;
+
+ mem_ctx_obj = pytalloc_GenericObject_reference(mem_ctx);
+ if (mem_ctx_obj == NULL) {
+ return NULL;
+ }
+
+ ret_obj = PyObject_CallMethod((PyObject *)type,
+ discard_const_p(char, "__export__"),
+ discard_const_p(char, "OiO"),
+ mem_ctx_obj, level, in);
+ Py_XDECREF(mem_ctx_obj);
+ if (ret_obj == NULL) {
+ return NULL;
+ }
+
+ ret = _pytalloc_get_type(ret_obj, typename);
+ Py_XDECREF(ret_obj);
+ return ret;
+}
+
+PyObject *py_dcerpc_ndr_pointer_deref(PyTypeObject *type, PyObject *obj)
+{
+ if (!PyObject_TypeCheck(obj, type)) {
+ PyErr_Format(PyExc_TypeError,
+ "Expected type '%s' but got type '%s'",
+ (type)->tp_name, Py_TYPE(obj)->tp_name);
+ return NULL;
+ }
+
+ return PyObject_GetAttrString(obj, discard_const_p(char, "value"));
+}
+
+PyObject *py_dcerpc_ndr_pointer_wrap(PyTypeObject *type, PyObject *obj)
+{
+ PyObject *args = NULL;
+ PyObject *ret_obj = NULL;
+
+ args = PyTuple_New(1);
+ if (args == NULL) {
+ return NULL;
+ }
+ Py_XINCREF(obj);
+ PyTuple_SetItem(args, 0, obj);
+
+ ret_obj = PyObject_Call((PyObject *)type, args, NULL);
+ Py_XDECREF(args);
+ return ret_obj;
+}
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