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  • Committer: Chuck Short
  • Date: 2010-09-28 20:38:39 UTC
  • Revision ID: zulcss@ubuntu.com-20100928203839-pgjulytsi9ue63x1
Initial version

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source4/librpc/rpc/pyrpc.c
 
1
/* 
 
2
   Unix SMB/CIFS implementation.
 
3
   Samba utility functions
 
4
   Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2008
 
5
   
 
6
   This program is free software; you can redistribute it and/or modify
 
7
   it under the terms of the GNU General Public License as published by
 
8
   the Free Software Foundation; either version 3 of the License, or
 
9
   (at your option) any later version.
 
10
   
 
11
   This program is distributed in the hope that it will be useful,
 
12
   but WITHOUT ANY WARRANTY; without even the implied warranty of
 
13
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
14
   GNU General Public License for more details.
 
15
   
 
16
   You should have received a copy of the GNU General Public License
 
17
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
18
*/
 
19
 
 
20
#include "includes.h"
 
21
#include <Python.h>
 
22
#include <structmember.h>
 
23
#include "librpc/rpc/pyrpc.h"
 
24
#include "librpc/rpc/dcerpc.h"
 
25
#include "lib/events/events.h"
 
26
#include "param/pyparam.h"
 
27
 
 
28
#ifndef Py_RETURN_NONE
 
29
#define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
 
30
#endif
 
31
 
 
32
static PyObject *py_dcerpc_run_function(dcerpc_InterfaceObject *iface,
 
33
                                        const struct PyNdrRpcMethodDef *md,
 
34
                                        PyObject *args, PyObject *kwargs)
 
35
{
 
36
        TALLOC_CTX *mem_ctx;
 
37
        NTSTATUS status;
 
38
        void *r;
 
39
        PyObject *result = Py_None;
 
40
 
 
41
        if (md->pack_in_data == NULL || md->unpack_out_data == NULL) {
 
42
                PyErr_SetString(PyExc_NotImplementedError, "No marshalling code available yet");
 
43
                return NULL;
 
44
        }
 
45
 
 
46
        mem_ctx = talloc_new(NULL);
 
47
        if (mem_ctx == NULL) {
 
48
                PyErr_NoMemory();
 
49
                return NULL;
 
50
        }
 
51
 
 
52
        r = talloc_zero_size(mem_ctx, md->table->calls[md->opnum].struct_size);
 
53
        if (r == NULL) {
 
54
                PyErr_NoMemory();
 
55
                return NULL;
 
56
        }
 
57
 
 
58
        if (!md->pack_in_data(args, kwargs, r)) {
 
59
                talloc_free(mem_ctx);
 
60
                return NULL;
 
61
        }
 
62
 
 
63
        status = md->call(iface->pipe, mem_ctx, r);
 
64
        if (NT_STATUS_IS_ERR(status)) {
 
65
                PyErr_SetDCERPCStatus(iface->pipe, status);
 
66
                talloc_free(mem_ctx);
 
67
                return NULL;
 
68
        }
 
69
 
 
70
        result = md->unpack_out_data(r);
 
71
 
 
72
        talloc_free(mem_ctx);
 
73
        return result;
 
74
}
 
75
 
 
76
static PyObject *py_dcerpc_call_wrapper(PyObject *self, PyObject *args, void *wrapped, PyObject *kwargs)
 
77
{       
 
78
        dcerpc_InterfaceObject *iface = (dcerpc_InterfaceObject *)self;
 
79
        const struct PyNdrRpcMethodDef *md = (const struct PyNdrRpcMethodDef *)wrapped;
 
80
 
 
81
        return py_dcerpc_run_function(iface, md, args, kwargs);
 
82
}
 
83
 
 
84
 
 
85
bool PyInterface_AddNdrRpcMethods(PyTypeObject *ifacetype, const struct PyNdrRpcMethodDef *mds)
 
86
{
 
87
        int i;
 
88
        for (i = 0; mds[i].name; i++) {
 
89
                PyObject *ret;
 
90
                struct wrapperbase *wb = (struct wrapperbase *)calloc(sizeof(struct wrapperbase), 1);
 
91
 
 
92
                wb->name = discard_const_p(char, mds[i].name);
 
93
                wb->flags = PyWrapperFlag_KEYWORDS;
 
94
                wb->wrapper = (wrapperfunc)py_dcerpc_call_wrapper;
 
95
                wb->doc = discard_const_p(char, mds[i].doc);
 
96
                
 
97
                ret = PyDescr_NewWrapper(ifacetype, wb, discard_const_p(void, &mds[i]));
 
98
 
 
99
                PyDict_SetItemString(ifacetype->tp_dict, mds[i].name, 
 
100
                                     (PyObject *)ret);
 
101
        }
 
102
 
 
103
        return true;
 
104
}
 
105
 
 
106
static bool PyString_AsGUID(PyObject *object, struct GUID *uuid)
 
107
{
 
108
        NTSTATUS status;
 
109
        status = GUID_from_string(PyString_AsString(object), uuid);
 
110
        if (NT_STATUS_IS_ERR(status)) {
 
111
                PyErr_SetNTSTATUS(status);
 
112
                return false;
 
113
        }
 
114
        return true;
 
115
}
 
116
 
 
117
static bool ndr_syntax_from_py_object(PyObject *object, struct ndr_syntax_id *syntax_id)
 
118
{
 
119
        ZERO_STRUCTP(syntax_id);
 
120
 
 
121
        if (PyString_Check(object)) {
 
122
                return PyString_AsGUID(object, &syntax_id->uuid);
 
123
        } else if (PyTuple_Check(object)) {
 
124
                if (PyTuple_Size(object) < 1 || PyTuple_Size(object) > 2) {
 
125
                        PyErr_SetString(PyExc_ValueError, "Syntax ID tuple has invalid size");
 
126
                        return false;
 
127
                }
 
128
 
 
129
                if (!PyString_Check(PyTuple_GetItem(object, 0))) {
 
130
                        PyErr_SetString(PyExc_ValueError, "Expected GUID as first element in tuple");
 
131
                        return false;
 
132
                }
 
133
 
 
134
                if (!PyString_AsGUID(PyTuple_GetItem(object, 0), &syntax_id->uuid)) 
 
135
                        return false;
 
136
 
 
137
                if (!PyInt_Check(PyTuple_GetItem(object, 1))) {
 
138
                        PyErr_SetString(PyExc_ValueError, "Expected version as second element in tuple");
 
139
                        return false;
 
140
                }
 
141
 
 
142
                syntax_id->if_version = PyInt_AsLong(PyTuple_GetItem(object, 1));
 
143
                return true;
 
144
        }
 
145
 
 
146
        PyErr_SetString(PyExc_TypeError, "Expected UUID or syntax id tuple");
 
147
        return false;
 
148
}       
 
149
 
 
150
static PyObject *py_iface_server_name(PyObject *obj, void *closure)
 
151
{
 
152
        const char *server_name;
 
153
        dcerpc_InterfaceObject *iface = (dcerpc_InterfaceObject *)obj;
 
154
        
 
155
        server_name = dcerpc_server_name(iface->pipe);
 
156
        if (server_name == NULL)
 
157
                Py_RETURN_NONE;
 
158
 
 
159
        return PyString_FromString(server_name);
 
160
}
 
161
 
 
162
static PyObject *py_ndr_syntax_id(struct ndr_syntax_id *syntax_id)
 
163
{
 
164
        PyObject *ret;
 
165
        char *uuid_str;
 
166
 
 
167
        uuid_str = GUID_string(NULL, &syntax_id->uuid);
 
168
        if (uuid_str == NULL)
 
169
                return NULL;
 
170
 
 
171
        ret = Py_BuildValue("(s,i)", uuid_str, syntax_id->if_version);
 
172
 
 
173
        talloc_free(uuid_str);
 
174
 
 
175
        return ret;
 
176
}
 
177
 
 
178
static PyObject *py_iface_abstract_syntax(PyObject *obj, void *closure)
 
179
{
 
180
        dcerpc_InterfaceObject *iface = (dcerpc_InterfaceObject *)obj;
 
181
 
 
182
        return py_ndr_syntax_id(&iface->pipe->syntax);
 
183
}
 
184
 
 
185
static PyObject *py_iface_transfer_syntax(PyObject *obj, void *closure)
 
186
{
 
187
        dcerpc_InterfaceObject *iface = (dcerpc_InterfaceObject *)obj;
 
188
 
 
189
        return py_ndr_syntax_id(&iface->pipe->transfer_syntax);
 
190
}
 
191
 
 
192
static PyGetSetDef dcerpc_interface_getsetters[] = {
 
193
        { discard_const_p(char, "server_name"), py_iface_server_name, NULL,
 
194
          discard_const_p(char, "name of the server, if connected over SMB") },
 
195
        { discard_const_p(char, "abstract_syntax"), py_iface_abstract_syntax, NULL, 
 
196
          discard_const_p(char, "syntax id of the abstract syntax") },
 
197
        { discard_const_p(char, "transfer_syntax"), py_iface_transfer_syntax, NULL, 
 
198
          discard_const_p(char, "syntax id of the transfersyntax") },
 
199
        { NULL }
 
200
};
 
201
 
 
202
static PyMemberDef dcerpc_interface_members[] = {
 
203
        { discard_const_p(char, "request_timeout"), T_INT, 
 
204
          offsetof(struct dcerpc_pipe, request_timeout), 0,
 
205
          discard_const_p(char, "request timeout, in seconds") },
 
206
        { NULL }
 
207
};
 
208
 
 
209
void PyErr_SetDCERPCStatus(struct dcerpc_pipe *p, NTSTATUS status)
 
210
{
 
211
        if (p != NULL && NT_STATUS_EQUAL(status, NT_STATUS_NET_WRITE_FAULT)) {
 
212
                const char *errstr = dcerpc_errstr(NULL, p->last_fault_code);
 
213
                PyErr_SetObject(PyExc_RuntimeError, 
 
214
                        Py_BuildValue("(i,s)", p->last_fault_code,
 
215
                                      errstr));
 
216
        } else {
 
217
                PyErr_SetNTSTATUS(status);
 
218
        }
 
219
}
 
220
 
 
221
static PyObject *py_iface_request(PyObject *self, PyObject *args, PyObject *kwargs)
 
222
{
 
223
        dcerpc_InterfaceObject *iface = (dcerpc_InterfaceObject *)self;
 
224
        int opnum;
 
225
        DATA_BLOB data_in, data_out;
 
226
        NTSTATUS status;
 
227
        char *in_data;
 
228
        int in_length;
 
229
        PyObject *ret;
 
230
        PyObject *object = NULL;
 
231
        struct GUID object_guid;
 
232
        TALLOC_CTX *mem_ctx = talloc_new(NULL);
 
233
        const char *kwnames[] = { "opnum", "data", "object", NULL };
 
234
 
 
235
        if (!PyArg_ParseTupleAndKeywords(args, kwargs, "is#|O:request", 
 
236
                discard_const_p(char *, kwnames), &opnum, &in_data, &in_length, &object)) {
 
237
                return NULL;
 
238
        }
 
239
 
 
240
        data_in.data = (uint8_t *)talloc_memdup(mem_ctx, in_data, in_length);
 
241
        data_in.length = in_length;
 
242
 
 
243
        ZERO_STRUCT(data_out);
 
244
 
 
245
        if (object != NULL && !PyString_AsGUID(object, &object_guid)) {
 
246
                return NULL;
 
247
        }
 
248
 
 
249
        status = dcerpc_request(iface->pipe, object?&object_guid:NULL,
 
250
                                opnum, false, mem_ctx, &data_in, &data_out);
 
251
 
 
252
        if (NT_STATUS_IS_ERR(status)) {
 
253
                PyErr_SetDCERPCStatus(iface->pipe, status);
 
254
                talloc_free(mem_ctx);
 
255
                return NULL;
 
256
        }
 
257
 
 
258
        ret = PyString_FromStringAndSize((char *)data_out.data, data_out.length);
 
259
 
 
260
        talloc_free(mem_ctx);
 
261
        return ret;
 
262
}
 
263
 
 
264
static PyObject *py_iface_alter_context(PyObject *self, PyObject *args, PyObject *kwargs)
 
265
{
 
266
        dcerpc_InterfaceObject *iface = (dcerpc_InterfaceObject *)self;
 
267
        NTSTATUS status;
 
268
        const char *kwnames[] = { "abstract_syntax", "transfer_syntax", NULL };
 
269
        PyObject *py_abstract_syntax = Py_None, *py_transfer_syntax = Py_None;
 
270
        struct ndr_syntax_id abstract_syntax, transfer_syntax;
 
271
 
 
272
        if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|O:alter_context", 
 
273
                discard_const_p(char *, kwnames), &py_abstract_syntax,
 
274
                &py_transfer_syntax)) {
 
275
                return NULL;
 
276
        }
 
277
 
 
278
        if (!ndr_syntax_from_py_object(py_abstract_syntax, &abstract_syntax))
 
279
                return NULL;
 
280
 
 
281
        if (py_transfer_syntax == Py_None) {
 
282
                transfer_syntax = ndr_transfer_syntax;
 
283
        } else {
 
284
                if (!ndr_syntax_from_py_object(py_transfer_syntax, 
 
285
                                               &transfer_syntax))
 
286
                        return NULL;
 
287
        }
 
288
 
 
289
        status = dcerpc_alter_context(iface->pipe, iface->pipe, &abstract_syntax, 
 
290
                                      &transfer_syntax);
 
291
 
 
292
        if (NT_STATUS_IS_ERR(status)) {
 
293
                PyErr_SetDCERPCStatus(iface->pipe, status);
 
294
                return NULL;
 
295
        }
 
296
 
 
297
        Py_RETURN_NONE;
 
298
}
 
299
 
 
300
PyObject *py_dcerpc_interface_init_helper(PyTypeObject *type, PyObject *args, PyObject *kwargs, const struct ndr_interface_table *table)
 
301
{
 
302
        dcerpc_InterfaceObject *ret;
 
303
        const char *binding_string;
 
304
        struct cli_credentials *credentials;
 
305
        struct loadparm_context *lp_ctx = NULL;
 
306
        PyObject *py_lp_ctx = Py_None, *py_credentials = Py_None, *py_basis = Py_None;
 
307
        TALLOC_CTX *mem_ctx = NULL;
 
308
        struct tevent_context *event_ctx;
 
309
        NTSTATUS status;
 
310
 
 
311
        const char *kwnames[] = {
 
312
                "binding", "lp_ctx", "credentials", "basis_connection", NULL
 
313
        };
 
314
        extern struct cli_credentials *cli_credentials_from_py_object(PyObject *py_obj);
 
315
 
 
316
        if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|OOO:samr", discard_const_p(char *, kwnames), &binding_string, &py_lp_ctx, &py_credentials, &py_basis)) {
 
317
                return NULL;
 
318
        }
 
319
 
 
320
        lp_ctx = lp_from_py_object(py_lp_ctx);
 
321
        if (lp_ctx == NULL) {
 
322
                PyErr_SetString(PyExc_TypeError, "Expected loadparm context");
 
323
                return NULL;
 
324
        }
 
325
 
 
326
        status = dcerpc_init(lp_ctx);
 
327
        if (!NT_STATUS_IS_OK(status)) {
 
328
                PyErr_SetNTSTATUS(status);
 
329
                return NULL;
 
330
        }
 
331
        credentials = cli_credentials_from_py_object(py_credentials);
 
332
        if (credentials == NULL) {
 
333
                PyErr_SetString(PyExc_TypeError, "Expected credentials");
 
334
                return NULL;
 
335
        }
 
336
        ret = PyObject_New(dcerpc_InterfaceObject, type);
 
337
 
 
338
        event_ctx = event_context_init(mem_ctx);
 
339
 
 
340
        if (py_basis != Py_None) {
 
341
                struct dcerpc_pipe *base_pipe;
 
342
 
 
343
                if (!PyObject_TypeCheck(py_basis, &dcerpc_InterfaceType)) {
 
344
                        PyErr_SetString(PyExc_ValueError, "basis_connection must be a DCE/RPC connection");
 
345
                        talloc_free(mem_ctx);
 
346
                        return NULL;
 
347
                }
 
348
 
 
349
                base_pipe = ((dcerpc_InterfaceObject *)py_basis)->pipe;
 
350
 
 
351
                status = dcerpc_secondary_context(base_pipe, &ret->pipe, table);
 
352
        } else {
 
353
                status = dcerpc_pipe_connect(NULL, &ret->pipe, binding_string, 
 
354
                             table, credentials, event_ctx, lp_ctx);
 
355
        }
 
356
        if (NT_STATUS_IS_ERR(status)) {
 
357
                PyErr_SetNTSTATUS(status);
 
358
                talloc_free(mem_ctx);
 
359
                return NULL;
 
360
        }
 
361
 
 
362
        ret->pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 
363
        return (PyObject *)ret;
 
364
}
 
365
 
 
366
static PyMethodDef dcerpc_interface_methods[] = {
 
367
        { "request", (PyCFunction)py_iface_request, METH_VARARGS|METH_KEYWORDS, "S.request(opnum, data, object=None) -> data\nMake a raw request" },
 
368
        { "alter_context", (PyCFunction)py_iface_alter_context, METH_VARARGS|METH_KEYWORDS, "S.alter_context(syntax)\nChange to a different interface" },
 
369
        { NULL, NULL, 0, NULL },
 
370
};
 
371
 
 
372
 
 
373
static void dcerpc_interface_dealloc(PyObject* self)
 
374
{
 
375
        dcerpc_InterfaceObject *interface = (dcerpc_InterfaceObject *)self;
 
376
        talloc_free(interface->pipe);
 
377
        PyObject_Del(self);
 
378
}
 
379
 
 
380
static PyObject *dcerpc_interface_new(PyTypeObject *self, PyObject *args, PyObject *kwargs)
 
381
{
 
382
        dcerpc_InterfaceObject *ret;
 
383
        const char *binding_string;
 
384
        struct cli_credentials *credentials;
 
385
        struct loadparm_context *lp_ctx = NULL;
 
386
        PyObject *py_lp_ctx = Py_None, *py_credentials = Py_None;
 
387
        TALLOC_CTX *mem_ctx = NULL;
 
388
        struct tevent_context *event_ctx;
 
389
        NTSTATUS status;
 
390
 
 
391
        PyObject *syntax, *py_basis = Py_None;
 
392
        const char *kwnames[] = {
 
393
                "binding", "syntax", "lp_ctx", "credentials", "basis_connection", NULL
 
394
        };
 
395
        extern struct cli_credentials *cli_credentials_from_py_object(PyObject *py_obj);
 
396
        struct ndr_interface_table *table;
 
397
 
 
398
        if (!PyArg_ParseTupleAndKeywords(args, kwargs, "sO|OOO:connect", discard_const_p(char *, kwnames), &binding_string, &syntax, &py_lp_ctx, &py_credentials, &py_basis)) {
 
399
                return NULL;
 
400
        }
 
401
 
 
402
        lp_ctx = lp_from_py_object(py_lp_ctx);
 
403
        if (lp_ctx == NULL) {
 
404
                PyErr_SetString(PyExc_TypeError, "Expected loadparm context");
 
405
                return NULL;
 
406
        }
 
407
 
 
408
        credentials = cli_credentials_from_py_object(py_credentials);
 
409
        if (credentials == NULL) {
 
410
                PyErr_SetString(PyExc_TypeError, "Expected credentials");
 
411
                return NULL;
 
412
        }
 
413
        ret = PyObject_New(dcerpc_InterfaceObject, &dcerpc_InterfaceType);
 
414
 
 
415
        event_ctx = s4_event_context_init(mem_ctx);
 
416
 
 
417
        /* Create a dummy interface table struct. TODO: In the future, we should rather just allow 
 
418
         * connecting without requiring an interface table.
 
419
         */
 
420
 
 
421
        table = talloc_zero(mem_ctx, struct ndr_interface_table);
 
422
 
 
423
        if (table == NULL) {
 
424
                PyErr_SetString(PyExc_MemoryError, "Allocating interface table");
 
425
                return NULL;
 
426
        }
 
427
 
 
428
        if (!ndr_syntax_from_py_object(syntax, &table->syntax_id)) {
 
429
                return NULL;
 
430
        }
 
431
 
 
432
        ret->pipe = NULL;
 
433
 
 
434
        if (py_basis != Py_None) {
 
435
                struct dcerpc_pipe *base_pipe;
 
436
 
 
437
                if (!PyObject_TypeCheck(py_basis, &dcerpc_InterfaceType)) {
 
438
                        PyErr_SetString(PyExc_ValueError, "basis_connection must be a DCE/RPC connection");
 
439
                        talloc_free(mem_ctx);
 
440
                        return NULL;
 
441
                }
 
442
 
 
443
                base_pipe = ((dcerpc_InterfaceObject *)py_basis)->pipe;
 
444
 
 
445
                status = dcerpc_secondary_context(base_pipe, &ret->pipe, 
 
446
                                     table);
 
447
                ret->pipe = talloc_steal(NULL, ret->pipe);
 
448
        } else {
 
449
                status = dcerpc_pipe_connect(NULL, &ret->pipe, binding_string, 
 
450
                             table, credentials, event_ctx, lp_ctx);
 
451
        }
 
452
 
 
453
        if (NT_STATUS_IS_ERR(status)) {
 
454
                PyErr_SetDCERPCStatus(ret->pipe, status);
 
455
                talloc_free(mem_ctx);
 
456
                return NULL;
 
457
        }
 
458
        ret->pipe->conn->flags |= DCERPC_NDR_REF_ALLOC;
 
459
        return (PyObject *)ret;
 
460
}
 
461
 
 
462
PyTypeObject dcerpc_InterfaceType = {
 
463
        PyObject_HEAD_INIT(NULL) 0,
 
464
        .tp_name = "dcerpc.ClientConnection",
 
465
        .tp_basicsize = sizeof(dcerpc_InterfaceObject),
 
466
        .tp_dealloc = dcerpc_interface_dealloc,
 
467
        .tp_getset = dcerpc_interface_getsetters,
 
468
        .tp_members = dcerpc_interface_members,
 
469
        .tp_methods = dcerpc_interface_methods,
 
470
        .tp_doc = "ClientConnection(binding, syntax, lp_ctx=None, credentials=None) -> connection\n"
 
471
"\n"
 
472
"binding should be a DCE/RPC binding string (for example: ncacn_ip_tcp:127.0.0.1)\n"
 
473
"syntax should be a tuple with a GUID and version number of an interface\n"
 
474
"lp_ctx should be a path to a smb.conf file or a param.LoadParm object\n"
 
475
"credentials should be a credentials.Credentials object.\n\n",
 
476
        .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
 
477
        .tp_new = dcerpc_interface_new,
 
478
};
 
479
 
 
480
void initbase(void)
 
481
{
 
482
        PyObject *m;
 
483
 
 
484
        if (PyType_Ready(&dcerpc_InterfaceType) < 0)
 
485
                return;
 
486
 
 
487
        m = Py_InitModule3("base", NULL, "DCE/RPC protocol implementation");
 
488
        if (m == NULL)
 
489
                return;
 
490
 
 
491
        Py_INCREF((PyObject *)&dcerpc_InterfaceType);
 
492
        PyModule_AddObject(m, "ClientConnection", (PyObject *)&dcerpc_InterfaceType);
 
493
}