source4/librpc/rpc/pyrpc_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Python interface to DCE/RPC library - utility functions.
   5
   6    Copyright (C) 2010 Jelmer Vernooij <jelmer@samba.org>
   7    Copyright (C) 2010 Andrew Tridgell <tridge@samba.org>
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include <Python.h>
  24 #include "python/py3compat.h"
  25 #include "includes.h"
  26 #include "librpc/rpc/pyrpc_util.h"
  27 #include "librpc/rpc/dcerpc.h"
  28 #include "librpc/rpc/pyrpc.h"
  29 #include "param/pyparam.h"
  30 #include "auth/credentials/pycredentials.h"
  31 #include "lib/events/events.h"
  32 #include "lib/messaging/messaging.h"
  33 #include "lib/messaging/irpc.h"
  34
  35 bool py_check_dcerpc_type(PyObject *obj, const char *module, const char *type_name)
  36 {
  37         PyObject *mod;
  38         PyTypeObject *type;
  39         bool ret;
  40
  41         mod = PyImport_ImportModule(module);
  42
  43         if (mod == NULL) {
  44                 PyErr_Format(PyExc_RuntimeError, "Unable to import %s to check type %s",
  45                         module, type_name);
  46                 return false;
  47         }
  48
  49         type = (PyTypeObject *)PyObject_GetAttrString(mod, type_name);
  50         Py_DECREF(mod);
  51         if (type == NULL) {
  52                 PyErr_Format(PyExc_RuntimeError, "Unable to find type %s in module %s",
  53                         module, type_name);
  54                 return false;
  55         }
  56
  57         ret = PyObject_TypeCheck(obj, type);
  58         Py_DECREF(type);
  59
  60         if (!ret)
  61                 PyErr_Format(PyExc_TypeError, "Expected type %s.%s, got %s",
  62                         module, type_name, Py_TYPE(obj)->tp_name);
  63
  64         return ret;
  65 }
  66
  67 /*
  68   connect to a IRPC pipe from python
  69  */
  70 static NTSTATUS pyrpc_irpc_connect(TALLOC_CTX *mem_ctx, const char *irpc_server,
  71                                    const struct ndr_interface_table *table,
  72                                    struct tevent_context *event_ctx,
  73                                    struct loadparm_context *lp_ctx,
  74                                    struct dcerpc_binding_handle **binding_handle)
  75 {
  76         struct imessaging_context *msg;
  77
  78         msg = imessaging_client_init(mem_ctx, lp_ctx, event_ctx);
  79         NT_STATUS_HAVE_NO_MEMORY(msg);
  80
  81         *binding_handle = irpc_binding_handle_by_name(mem_ctx, msg, irpc_server, table);
  82         if (*binding_handle == NULL) {
  83                 talloc_free(msg);
  84                 return NT_STATUS_INVALID_PIPE_STATE;
  85         }
  86
  87         /*
  88          * Note: this allows nested event loops to happen,
  89          * but as there's no top level event loop it's not that critical.
  90          */
  91         dcerpc_binding_handle_set_sync_ev(*binding_handle, event_ctx);
  92
  93         return NT_STATUS_OK;
  94 }
  95
  96 PyObject *py_dcerpc_interface_init_helper(PyTypeObject *type, PyObject *args, PyObject *kwargs,
  97                                           const struct ndr_interface_table *table)
  98 {
  99         dcerpc_InterfaceObject *ret;
 100         const char *binding_string;
 101         PyObject *py_lp_ctx = Py_None, *py_credentials = Py_None, *py_basis = Py_None;
 102         NTSTATUS status;
 103         unsigned int timeout = (unsigned int)-1;
 104         const char *kwnames[] = {
 105                 "binding", "lp_ctx", "credentials", "timeout", "basis_connection", NULL
 106         };
 107
 108         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|OOIO:samr", discard_const_p(char *, kwnames), &binding_string, &py_lp_ctx, &py_credentials, &timeout, &py_basis)) {
 109                 return NULL;
 110         }
 111
 112         status = dcerpc_init();
 113         if (!NT_STATUS_IS_OK(status)) {
 114                 PyErr_SetNTSTATUS(status);
 115                 return NULL;
 116         }
 117
 118         ret = PyObject_New(dcerpc_InterfaceObject, type);
 119         if (ret == NULL) {
 120                 PyErr_NoMemory();
 121                 return NULL;
 122         }
 123
 124         ret->pipe = NULL;
 125         ret->binding_handle = NULL;
 126         ret->mem_ctx = talloc_new(NULL);
 127         if (ret->mem_ctx == NULL) {
 128                 PyErr_NoMemory();
 129                 return NULL;
 130         }
 131
 132         if (strncmp(binding_string, "irpc:", 5) == 0) {
 133                 struct tevent_context *event_ctx;
 134                 struct loadparm_context *lp_ctx;
 135
 136                 event_ctx = s4_event_context_init(ret->mem_ctx);
 137                 if (event_ctx == NULL) {
 138                         PyErr_SetString(PyExc_TypeError, "Expected loadparm context");
 139                         TALLOC_FREE(ret->mem_ctx);
 140                         Py_DECREF(ret);
 141                         return NULL;
 142                 }
 143
 144                 lp_ctx = lpcfg_from_py_object(event_ctx, py_lp_ctx);
 145                 if (lp_ctx == NULL) {
 146                         PyErr_SetString(PyExc_TypeError, "Expected loadparm context");
 147                         TALLOC_FREE(ret->mem_ctx);
 148                         Py_DECREF(ret);
 149                         return NULL;
 150                 }
 151
 152                 status = pyrpc_irpc_connect(ret->mem_ctx, binding_string+5, table,
 153                                             event_ctx, lp_ctx, &ret->binding_handle);
 154                 if (!NT_STATUS_IS_OK(status)) {
 155                         PyErr_SetNTSTATUS(status);
 156                         TALLOC_FREE(ret->mem_ctx);
 157                         Py_DECREF(ret);
 158                         return NULL;
 159                 }
 160         } else if (py_basis != Py_None) {
 161                 struct dcerpc_pipe *base_pipe;
 162                 PyObject *py_base;
 163                 PyTypeObject *ClientConnection_Type;
 164
 165                 py_base = PyImport_ImportModule("samba.dcerpc.base");
 166                 if (py_base == NULL) {
 167                         TALLOC_FREE(ret->mem_ctx);
 168                         Py_DECREF(ret);
 169                         return NULL;
 170                 }
 171
 172                 ClientConnection_Type = (PyTypeObject *)PyObject_GetAttrString(py_base, "ClientConnection");
 173                 if (ClientConnection_Type == NULL) {
 174                         PyErr_SetNone(PyExc_TypeError);
 175                         TALLOC_FREE(ret->mem_ctx);
 176                         Py_DECREF(ret);
 177                         Py_DECREF(py_base);
 178                         return NULL;
 179                 }
 180
 181                 if (!PyObject_TypeCheck(py_basis, ClientConnection_Type)) {
 182                         PyErr_SetString(PyExc_TypeError, "basis_connection must be a DCE/RPC connection");
 183                         TALLOC_FREE(ret->mem_ctx);
 184                         Py_DECREF(ret);
 185                         Py_DECREF(py_base);
 186                         Py_DECREF(ClientConnection_Type);
 187                         return NULL;
 188                 }
 189
 190                 base_pipe = talloc_reference(ret->mem_ctx,
 191                                          ((dcerpc_InterfaceObject *)py_basis)->pipe);
 192                 if (base_pipe == NULL) {
 193                         PyErr_NoMemory();
 194                         TALLOC_FREE(ret->mem_ctx);
 195                         Py_DECREF(ret);
 196                         Py_DECREF(py_base);
 197                         Py_DECREF(ClientConnection_Type);
 198                         return NULL;
 199                 }
 200
 201                 status = dcerpc_secondary_context(base_pipe, &ret->pipe, table);
 202                 if (!NT_STATUS_IS_OK(status)) {
 203                         PyErr_SetNTSTATUS(status);
 204                         TALLOC_FREE(ret->mem_ctx);
 205                         Py_DECREF(ret);
 206                         Py_DECREF(py_base);
 207                         Py_DECREF(ClientConnection_Type);
 208                         return NULL;
 209                 }
 210
 211                 ret->pipe = talloc_steal(ret->mem_ctx, ret->pipe);
 212                 Py_XDECREF(ClientConnection_Type);
 213                 Py_XDECREF(py_base);
 214         } else {
 215                 struct tevent_context *event_ctx;
 216                 struct loadparm_context *lp_ctx;
 217                 struct cli_credentials *credentials;
 218
 219                 event_ctx = s4_event_context_init(ret->mem_ctx);
 220                 if (event_ctx == NULL) {
 221                         PyErr_SetString(PyExc_TypeError, "Expected loadparm context");
 222                         TALLOC_FREE(ret->mem_ctx);
 223                         Py_DECREF(ret);
 224                         return NULL;
 225                 }
 226
 227                 lp_ctx = lpcfg_from_py_object(event_ctx, py_lp_ctx);
 228                 if (lp_ctx == NULL) {
 229                         PyErr_SetString(PyExc_TypeError, "Expected loadparm context");
 230                         TALLOC_FREE(ret->mem_ctx);
 231                         Py_DECREF(ret);
 232                         return NULL;
 233                 }
 234
 235                 credentials = cli_credentials_from_py_object(py_credentials);
 236                 if (credentials == NULL) {
 237                         PyErr_SetString(PyExc_TypeError, "Expected credentials");
 238                         TALLOC_FREE(ret->mem_ctx);
 239                         Py_DECREF(ret);
 240                         return NULL;
 241                 }
 242                 status = dcerpc_pipe_connect(ret->mem_ctx, &ret->pipe, binding_string,
 243                              table, credentials, event_ctx, lp_ctx);
 244                 if (!NT_STATUS_IS_OK(status)) {
 245                         PyErr_SetNTSTATUS(status);
 246                         TALLOC_FREE(ret->mem_ctx);
 247                         Py_DECREF(ret);
 248                         return NULL;
 249                 }
 250
 251                 /*
 252                  * the event context is cached under the connection,
 253                  * so let it be a child of it.
 254                  */
 255                 talloc_steal(ret->pipe->conn, event_ctx);
 256         }
 257
 258         if (ret->pipe) {
 259                 ret->pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 260                 ret->binding_handle = ret->pipe->binding_handle;
 261         }
 262
 263         /* reset timeout for the handle */
 264         if ((timeout != ((unsigned int)-1)) && (ret->binding_handle != NULL)) {
 265                 dcerpc_binding_handle_set_timeout(ret->binding_handle, timeout);
 266         }
 267
 268         return (PyObject *)ret;
 269 }
 270
 271 static PyObject *py_dcerpc_run_function(dcerpc_InterfaceObject *iface,
 272                                         const struct PyNdrRpcMethodDef *md,
 273                                         PyObject *args, PyObject *kwargs)
 274 {
 275         TALLOC_CTX *mem_ctx;
 276         NTSTATUS status;
 277         void *r;
 278         PyObject *result = Py_None;
 279
 280         if (md->pack_in_data == NULL || md->unpack_out_data == NULL) {
 281                 PyErr_SetString(PyExc_NotImplementedError, "No marshalling code available yet");
 282                 return NULL;
 283         }
 284
 285         mem_ctx = talloc_new(NULL);
 286         if (mem_ctx == NULL) {
 287                 PyErr_NoMemory();
 288                 return NULL;
 289         }
 290
 291         r = talloc_zero_size(mem_ctx, md->table->calls[md->opnum].struct_size);
 292         if (r == NULL) {
 293                 PyErr_NoMemory();
 294                 return NULL;
 295         }
 296
 297         if (!md->pack_in_data(args, kwargs, r)) {
 298                 talloc_free(mem_ctx);
 299                 return NULL;
 300         }
 301
 302         status = md->call(iface->binding_handle, mem_ctx, r);
 303         if (!NT_STATUS_IS_OK(status)) {
 304                 PyErr_SetDCERPCStatus(iface->pipe, status);
 305                 talloc_free(mem_ctx);
 306                 return NULL;
 307         }
 308
 309         result = md->unpack_out_data(r);
 310
 311         talloc_free(mem_ctx);
 312         return result;
 313 }
 314
 315 static PyObject *py_dcerpc_call_wrapper(PyObject *self, PyObject *args, void *wrapped, PyObject *kwargs)
 316 {
 317         dcerpc_InterfaceObject *iface = (dcerpc_InterfaceObject *)self;
 318         const struct PyNdrRpcMethodDef *md = (const struct PyNdrRpcMethodDef *)wrapped;
 319
 320         return py_dcerpc_run_function(iface, md, args, kwargs);
 321 }
 322
 323 bool PyInterface_AddNdrRpcMethods(PyTypeObject *ifacetype, const struct PyNdrRpcMethodDef *mds)
 324 {
 325         int i;
 326         for (i = 0; mds[i].name; i++) {
 327                 PyObject *ret;
 328                 struct wrapperbase *wb = (struct wrapperbase *)calloc(sizeof(struct wrapperbase), 1);
 329
 330                 if (wb == NULL) {
 331                         return false;
 332                 }
 333                 wb->name = discard_const_p(char, mds[i].name);
 334                 wb->flags = PyWrapperFlag_KEYWORDS;
 335                 wb->wrapper = (wrapperfunc)py_dcerpc_call_wrapper;
 336                 wb->doc = discard_const_p(char, mds[i].doc);
 337
 338                 ret = PyDescr_NewWrapper(ifacetype, wb, discard_const_p(void, &mds[i]));
 339
 340                 PyDict_SetItemString(ifacetype->tp_dict, mds[i].name,
 341                                      (PyObject *)ret);
 342         }
 343
 344         return true;
 345 }
 346
 347 PyObject *py_dcerpc_syntax_init_helper(PyTypeObject *type, PyObject *args, PyObject *kwargs,
 348                                        const struct ndr_syntax_id *syntax)
 349 {
 350         PyObject *ret;
 351         struct ndr_syntax_id *obj;
 352         const char *kwnames[] = { NULL };
 353
 354         if (!PyArg_ParseTupleAndKeywords(args, kwargs, ":abstract_syntax", discard_const_p(char *, kwnames))) {
 355                 return NULL;
 356         }
 357
 358         ret = pytalloc_new(struct ndr_syntax_id, type);
 359         if (ret == NULL) {
 360                 return NULL;
 361         }
 362
 363         obj = pytalloc_get_type(ret, struct ndr_syntax_id);
 364         *obj = *syntax;
 365
 366         return ret;
 367 }
 368
 369 void PyErr_SetDCERPCStatus(struct dcerpc_pipe *p, NTSTATUS status)
 370 {
 371         if (p && NT_STATUS_EQUAL(status, NT_STATUS_NET_WRITE_FAULT)) {
 372                 status = dcerpc_fault_to_nt_status(p->last_fault_code);
 373         }
 374         PyErr_SetNTSTATUS(status);
 375 }
 376
 377
 378 /*
 379   take a NDR structure that has a type in a python module and return
 380   it as a python object
 381
 382   r is the NDR structure pointer (a C structure)
 383
 384   r_ctx is the context that is a parent of r. It will be referenced by
 385   the resulting python object
 386
 387   This MUST only be used by objects that are based on pytalloc_Object
 388   otherwise the pytalloc_reference_ex() will fail.
 389  */
 390 PyObject *py_return_ndr_struct(const char *module_name, const char *type_name,
 391                                TALLOC_CTX *r_ctx, void *r)
 392 {
 393         PyTypeObject *py_type;
 394         PyObject *module;
 395
 396         if (r == NULL) {
 397                 Py_RETURN_NONE;
 398         }
 399
 400         module = PyImport_ImportModule(module_name);
 401         if (module == NULL) {
 402                 return NULL;
 403         }
 404
 405         py_type = (PyTypeObject *)PyObject_GetAttrString(module, type_name);
 406         if (py_type == NULL) {
 407                 Py_DECREF(module);
 408                 return NULL;
 409         }
 410
 411         return pytalloc_reference_ex(py_type, r_ctx, r);
 412 }
 413
 414 PyObject *PyString_FromStringOrNULL(const char *str)
 415 {
 416         if (str == NULL) {
 417                 Py_RETURN_NONE;
 418         }
 419         return PyStr_FromString(str);
 420 }
 421
 422 PyObject *pyrpc_import_union(PyTypeObject *type, TALLOC_CTX *mem_ctx, int level,
 423                              const void *in, const char *typename)
 424 {
 425         PyObject *mem_ctx_obj = NULL;
 426         PyObject *in_obj = NULL;
 427         PyObject *ret = NULL;
 428
 429         mem_ctx_obj = pytalloc_GenericObject_reference(mem_ctx);
 430         if (mem_ctx_obj == NULL) {
 431                 return NULL;
 432         }
 433
 434         in_obj = pytalloc_GenericObject_reference_ex(mem_ctx, discard_const(in));
 435         if (in_obj == NULL) {
 436                 Py_XDECREF(mem_ctx_obj);
 437                 return NULL;
 438         }
 439
 440         ret = PyObject_CallMethod((PyObject *)type,
 441                                   discard_const_p(char, "__import__"),
 442                                   discard_const_p(char, "OiO"),
 443                                   mem_ctx_obj, level, in_obj);
 444         Py_XDECREF(mem_ctx_obj);
 445         Py_XDECREF(in_obj);
 446         if (ret == NULL) {
 447                 return NULL;
 448         }
 449
 450         return ret;
 451 }
 452
 453 void *pyrpc_export_union(PyTypeObject *type, TALLOC_CTX *mem_ctx, int level,
 454                          PyObject *in, const char *typename)
 455 {
 456         PyObject *mem_ctx_obj = NULL;
 457         PyObject *ret_obj = NULL;
 458         void *ret = NULL;
 459
 460         mem_ctx_obj = pytalloc_GenericObject_reference(mem_ctx);
 461         if (mem_ctx_obj == NULL) {
 462                 return NULL;
 463         }
 464
 465         ret_obj = PyObject_CallMethod((PyObject *)type,
 466                                       discard_const_p(char, "__export__"),
 467                                       discard_const_p(char, "OiO"),
 468                                       mem_ctx_obj, level, in);
 469         Py_XDECREF(mem_ctx_obj);
 470         if (ret_obj == NULL) {
 471                 return NULL;
 472         }
 473
 474         ret = _pytalloc_get_type(ret_obj, typename);
 475         Py_XDECREF(ret_obj);
 476         return ret;
 477 }
 478
 479 PyObject *py_dcerpc_ndr_pointer_deref(PyTypeObject *type, PyObject *obj)
 480 {
 481         if (!PyObject_TypeCheck(obj, type)) {
 482                 PyErr_Format(PyExc_TypeError,
 483                              "Expected type '%s' but got type '%s'",
 484                              (type)->tp_name, Py_TYPE(obj)->tp_name);
 485                 return NULL;
 486         }
 487
 488         return PyObject_GetAttrString(obj, discard_const_p(char, "value"));
 489 }
 490
 491 PyObject *py_dcerpc_ndr_pointer_wrap(PyTypeObject *type, PyObject *obj)
 492 {
 493         PyObject *args = NULL;
 494         PyObject *ret_obj = NULL;
 495
 496         args = PyTuple_New(1);
 497         if (args == NULL) {
 498                 return NULL;
 499         }
 500         Py_XINCREF(obj);
 501         PyTuple_SetItem(args, 0, obj);
 502
 503         ret_obj = PyObject_Call((PyObject *)type, args, NULL);
 504         Py_XDECREF(args);
 505         return ret_obj;
 506 }