libgpo/pygpo.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Copyright (C) Luke Morrison <luc785@hotmail.com> 2013
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <Python.h>
  20 #include "includes.h"
  21 #include "version.h"
  22 #include "param/pyparam.h"
  23 #include "gpo.h"
  24 #include "ads.h"
  25 #include "secrets.h"
  26 #include "../libds/common/flags.h"
  27 #include "librpc/rpc/pyrpc_util.h"
  28 #include "auth/credentials/pycredentials.h"
  29 #include "libcli/util/pyerrors.h"
  30 #include "python/py3compat.h"
  31
  32 /* A Python C API module to use LIBGPO */
  33
  34 #define GPO_getter(ATTR) \
  35 static PyObject* GPO_get_##ATTR(PyObject *self, void *closure) \
  36 { \
  37         struct GROUP_POLICY_OBJECT *gpo_ptr \
  38                 = pytalloc_get_ptr(self); \
  39         \
  40         if (gpo_ptr->ATTR) \
  41                 return PyStr_FromString(gpo_ptr->ATTR); \
  42         else \
  43                 return Py_None; \
  44 }
  45 GPO_getter(ds_path)
  46 GPO_getter(file_sys_path)
  47 GPO_getter(display_name)
  48 GPO_getter(name)
  49 GPO_getter(link)
  50 GPO_getter(user_extensions)
  51 GPO_getter(machine_extensions)
  52
  53 static PyGetSetDef GPO_setters[] = {
  54         {discard_const_p(char, "ds_path"), (getter)GPO_get_ds_path, NULL, NULL,
  55                 NULL},
  56         {discard_const_p(char, "file_sys_path"), (getter)GPO_get_file_sys_path,
  57                 NULL, NULL, NULL},
  58         {discard_const_p(char, "display_name"), (getter)GPO_get_display_name,
  59                 NULL, NULL, NULL},
  60         {discard_const_p(char, "name"), (getter)GPO_get_name, NULL, NULL,
  61                 NULL},
  62         {discard_const_p(char, "link"), (getter)GPO_get_link, NULL, NULL,
  63                 NULL},
  64         {discard_const_p(char, "user_extensions"),
  65                 (getter)GPO_get_user_extensions,
  66                 NULL, NULL, NULL},
  67         {discard_const_p(char, "machine_extensions"),
  68                 (getter)GPO_get_machine_extensions, NULL, NULL, NULL},
  69         {NULL}
  70 };
  71
  72 static PyObject *py_gpo_get_unix_path(PyObject *self, PyObject *args,
  73                                       PyObject *kwds)
  74 {
  75         NTSTATUS status;
  76         const char *cache_dir = NULL;
  77         PyObject *ret = NULL;
  78         char *unix_path = NULL;
  79         TALLOC_CTX *frame = NULL;
  80         static const char *kwlist[] = {"cache_dir", NULL};
  81         struct GROUP_POLICY_OBJECT *gpo_ptr \
  82                 = (struct GROUP_POLICY_OBJECT *)pytalloc_get_ptr(self);
  83
  84         frame = talloc_stackframe();
  85
  86         if (!PyArg_ParseTupleAndKeywords(args, kwds, "|s",
  87                                          discard_const_p(char *, kwlist),
  88                                          &cache_dir)) {
  89                 goto out;
  90         }
  91
  92         if (!cache_dir) {
  93                 cache_dir = cache_path(talloc_tos(), GPO_CACHE_DIR);
  94                 if (!cache_dir) {
  95                         PyErr_SetString(PyExc_MemoryError,
  96                                         "Failed to determine gpo cache dir");
  97                         goto out;
  98                 }
  99         }
 100
 101         status = gpo_get_unix_path(frame, cache_dir, gpo_ptr, &unix_path);
 102
 103         if (!NT_STATUS_IS_OK(status)) {
 104                 PyErr_Format(PyExc_RuntimeError,
 105                                 "Failed to determine gpo unix path: %s",
 106                                 get_friendly_nt_error_msg(status));
 107                 goto out;
 108         }
 109
 110         ret = PyStr_FromString(unix_path);
 111
 112 out:
 113         TALLOC_FREE(frame);
 114         return ret;
 115 }
 116
 117 static PyMethodDef GPO_methods[] = {
 118         {"get_unix_path", (PyCFunction)py_gpo_get_unix_path, METH_KEYWORDS,
 119                 NULL },
 120         {NULL}
 121 };
 122
 123 static PyTypeObject GPOType = {
 124         PyVarObject_HEAD_INIT(NULL, 0)
 125         .tp_name = "gpo.GROUP_POLICY_OBJECT",
 126         .tp_doc = "GROUP_POLICY_OBJECT",
 127         .tp_getset = GPO_setters,
 128         .tp_methods = GPO_methods,
 129         .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
 130 };
 131
 132 typedef struct {
 133         PyObject_HEAD
 134         ADS_STRUCT *ads_ptr;
 135         PyObject *py_creds;
 136         struct cli_credentials *cli_creds;
 137 } ADS;
 138
 139 static void py_ads_dealloc(ADS* self)
 140 {
 141         ads_destroy(&(self->ads_ptr));
 142         Py_CLEAR(self->py_creds);
 143         Py_TYPE(self)->tp_free((PyObject*)self);
 144 }
 145
 146 static PyObject* py_ads_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 147 {
 148         ADS *self;
 149         self = (ADS*)type->tp_alloc(type, 0);
 150         return (PyObject*)self;
 151 }
 152
 153 static PyObject* py_ads_connect(ADS *self);
 154 static int py_ads_init(ADS *self, PyObject *args, PyObject *kwds)
 155 {
 156         const char *realm = NULL;
 157         const char *workgroup = NULL;
 158         const char *ldap_server = NULL;
 159         PyObject *lp_obj = NULL;
 160         struct loadparm_context *lp_ctx = NULL;
 161         bool ok = false;
 162
 163         static const char *kwlist[] = {
 164                 "ldap_server", "loadparm_context", "credentials", NULL
 165         };
 166         if (!PyArg_ParseTupleAndKeywords(args, kwds, "sO|O",
 167                                          discard_const_p(char *, kwlist),
 168                                          &ldap_server, &lp_obj, &self->py_creds)) {
 169                 return -1;
 170         }
 171         /* keep reference to the credentials */
 172         Py_XINCREF(self->py_creds);
 173
 174         if (self->py_creds) {
 175                 ok = py_check_dcerpc_type(self->py_creds, "samba.credentials",
 176                                           "Credentials");
 177                 if (!ok) {
 178                         return -1;
 179                 }
 180                 self->cli_creds
 181                         = PyCredentials_AsCliCredentials(self->py_creds);
 182         }
 183
 184         ok = py_check_dcerpc_type(lp_obj, "samba.param", "LoadParm");
 185         if (!ok) {
 186                 return -1;
 187         }
 188         lp_ctx = pytalloc_get_type(lp_obj, struct loadparm_context);
 189         if (lp_ctx == NULL) {
 190                 return -1;
 191         }
 192         ok = lp_load_initial_only(lp_ctx->szConfigFile);
 193         if (!ok) {
 194                 PyErr_Format(PyExc_RuntimeError, "Could not load config file '%s'",
 195                                 lp_ctx->szConfigFile);
 196                 return -1;
 197         }
 198
 199         if (self->cli_creds) {
 200                 realm = cli_credentials_get_realm(self->cli_creds);
 201                 workgroup = cli_credentials_get_domain(self->cli_creds);
 202         } else {
 203                 realm = lp_realm();
 204                 workgroup = lp_workgroup();
 205         }
 206
 207         /* always succeeds or crashes */
 208         self->ads_ptr = ads_init(realm, workgroup, ldap_server);
 209
 210         return 0;
 211 }
 212
 213 /* connect.  Failure to connect results in an Exception */
 214 static PyObject* py_ads_connect(ADS *self)
 215 {
 216         ADS_STATUS status;
 217         TALLOC_CTX *frame = talloc_stackframe();
 218         if (self->cli_creds) {
 219                 self->ads_ptr->auth.user_name =
 220                         SMB_STRDUP(cli_credentials_get_username(self->cli_creds));
 221                 self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 222                 self->ads_ptr->auth.password =
 223                         SMB_STRDUP(cli_credentials_get_password(self->cli_creds));
 224                 self->ads_ptr->auth.realm =
 225                         SMB_STRDUP(cli_credentials_get_realm(self->cli_creds));
 226
 227                 status = ads_connect_user_creds(self->ads_ptr);
 228                 if (!ADS_ERR_OK(status)) {
 229                         PyErr_Format(PyExc_RuntimeError,
 230                                         "ads_connect() failed: %s",
 231                                         ads_errstr(status));
 232                         goto err;
 233                 }
 234         } else {
 235                 char *passwd = NULL;
 236                 int ret = asprintf(&(self->ads_ptr->auth.user_name), "%s$",
 237                                    lp_netbios_name());
 238                 if (ret == -1) {
 239                         PyErr_SetString(PyExc_RuntimeError,
 240                                         "Failed to asprintf");
 241                         goto err;
 242                 } else {
 243                         self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 244                 }
 245
 246                 if (!secrets_init()) {
 247                         PyErr_SetString(PyExc_RuntimeError,
 248                                         "secrets_init() failed");
 249                         goto err;
 250                 }
 251
 252                 passwd = secrets_fetch_machine_password(self->ads_ptr->server.workgroup,
 253                                                         NULL, NULL);
 254                 if (passwd == NULL) {
 255                         PyErr_SetString(PyExc_RuntimeError,
 256                                         "Failed to fetch the machine account "
 257                                         "password");
 258                         goto err;
 259                 }
 260                 self->ads_ptr->auth.password = smb_xstrdup(passwd);
 261                 SAFE_FREE(passwd);
 262                 self->ads_ptr->auth.realm =
 263                         smb_xstrdup(self->ads_ptr->server.realm);
 264                 if (!strupper_m(self->ads_ptr->auth.realm)) {
 265                         PyErr_SetString(PyExc_RuntimeError, "Failed to strupper");
 266                         goto err;
 267                 }
 268
 269                 status = ads_connect(self->ads_ptr);
 270                 if (!ADS_ERR_OK(status)) {
 271                         PyErr_Format(PyExc_RuntimeError,
 272                                         "ads_connect() failed: %s",
 273                                         ads_errstr(status));
 274                         goto err;
 275                 }
 276         }
 277
 278         TALLOC_FREE(frame);
 279         Py_RETURN_TRUE;
 280
 281 err:
 282         TALLOC_FREE(frame);
 283         return NULL;
 284 }
 285
 286 /* Parameter mapping and functions for the GP_EXT struct */
 287 void initgpo(void);
 288
 289 /* Global methods aka do not need a special pyobject type */
 290 static PyObject *py_gpo_get_sysvol_gpt_version(PyObject * self,
 291                                                PyObject * args)
 292 {
 293         TALLOC_CTX *tmp_ctx = NULL;
 294         char *unix_path;
 295         char *display_name = NULL;
 296         uint32_t sysvol_version = 0;
 297         PyObject *result;
 298         NTSTATUS status;
 299
 300         if (!PyArg_ParseTuple(args, "s", &unix_path)) {
 301                 return NULL;
 302         }
 303         tmp_ctx = talloc_new(NULL);
 304         if (!tmp_ctx) {
 305                 return PyErr_NoMemory();
 306         }
 307         status = gpo_get_sysvol_gpt_version(tmp_ctx, unix_path,
 308                                             &sysvol_version,
 309                                             &display_name);
 310         if (!NT_STATUS_IS_OK(status)) {
 311                 PyErr_SetNTSTATUS(status);
 312                 TALLOC_FREE(tmp_ctx);
 313                 return NULL;
 314         }
 315
 316         result = Py_BuildValue("[s,i]", display_name, sysvol_version);
 317         talloc_free(tmp_ctx);
 318         return result;
 319 }
 320
 321 #ifdef HAVE_ADS
 322 static ADS_STATUS find_samaccount(ADS_STRUCT *ads, TALLOC_CTX *mem_ctx,
 323                                   const char *samaccountname,
 324                                   uint32_t *uac_ret, const char **dn_ret)
 325 {
 326         ADS_STATUS status;
 327         const char *attrs[] = { "userAccountControl", NULL };
 328         const char *filter;
 329         LDAPMessage *res = NULL;
 330         char *dn = NULL;
 331         uint32_t uac = 0;
 332
 333         filter = talloc_asprintf(mem_ctx, "(sAMAccountName=%s)",
 334                                  samaccountname);
 335         if (filter == NULL) {
 336                 status = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
 337                 goto out;
 338         }
 339
 340         status = ads_do_search_all(ads, ads->config.bind_path,
 341                                    LDAP_SCOPE_SUBTREE, filter, attrs, &res);
 342
 343         if (!ADS_ERR_OK(status)) {
 344                 goto out;
 345         }
 346
 347         if (ads_count_replies(ads, res) != 1) {
 348                 status = ADS_ERROR(LDAP_NO_RESULTS_RETURNED);
 349                 goto out;
 350         }
 351
 352         dn = ads_get_dn(ads, talloc_tos(), res);
 353         if (dn == NULL) {
 354                 status = ADS_ERROR(LDAP_NO_MEMORY);
 355                 goto out;
 356         }
 357
 358         if (!ads_pull_uint32(ads, res, "userAccountControl", &uac)) {
 359                 status = ADS_ERROR(LDAP_NO_SUCH_ATTRIBUTE);
 360                 goto out;
 361         }
 362
 363         if (uac_ret) {
 364                 *uac_ret = uac;
 365         }
 366
 367         if (dn_ret) {
 368                 *dn_ret = talloc_strdup(mem_ctx, dn);
 369                 if (*dn_ret == NULL) {
 370                         status = ADS_ERROR(LDAP_NO_MEMORY);
 371                         goto out;
 372                 }
 373         }
 374 out:
 375         TALLOC_FREE(dn);
 376         ads_msgfree(ads, res);
 377
 378         return status;
 379 }
 380
 381 static PyObject *py_ads_get_gpo_list(ADS *self, PyObject *args, PyObject *kwds)
 382 {
 383         TALLOC_CTX *frame = NULL;
 384         struct GROUP_POLICY_OBJECT *gpo = NULL, *gpo_list = NULL;
 385         ADS_STATUS status;
 386         const char *samaccountname = NULL;
 387         const char *dn = NULL;
 388         uint32_t uac = 0;
 389         uint32_t flags = 0;
 390         struct security_token *token = NULL;
 391         PyObject *ret = NULL;
 392         TALLOC_CTX *gpo_ctx = NULL;
 393         size_t list_size;
 394         size_t i;
 395
 396         static const char *kwlist[] = {"samaccountname", NULL};
 397         if (!PyArg_ParseTupleAndKeywords(args, kwds, "s",
 398                                          discard_const_p(char *, kwlist),
 399                                          &samaccountname)) {
 400                 return NULL;
 401         }
 402
 403         frame = talloc_stackframe();
 404
 405         status = find_samaccount(self->ads_ptr, frame,
 406                                  samaccountname, &uac, &dn);
 407         if (!ADS_ERR_OK(status)) {
 408                 PyErr_Format(PyExc_RuntimeError,
 409                                 "Failed to find samAccountName '%s': %s",
 410                                 samaccountname, ads_errstr(status));
 411                 goto out;
 412         }
 413
 414         if (uac & UF_WORKSTATION_TRUST_ACCOUNT ||
 415             uac & UF_SERVER_TRUST_ACCOUNT) {
 416                 flags |= GPO_LIST_FLAG_MACHINE;
 417                 status = gp_get_machine_token(self->ads_ptr, frame, dn,
 418                                               &token);
 419                 if (!ADS_ERR_OK(status)) {
 420                         PyErr_Format(PyExc_RuntimeError,
 421                                 "Failed to get machine token for '%s'(%s): %s",
 422                                 samaccountname, dn, ads_errstr(status));
 423                         goto out;
 424                 }
 425         } else {
 426                 status = ads_get_sid_token(self->ads_ptr, frame, dn, &token);
 427                 if (!ADS_ERR_OK(status)) {
 428                         PyErr_Format(PyExc_RuntimeError,
 429                                 "Failed to get sid token for '%s'(%s): %s",
 430                                 samaccountname, dn, ads_errstr(status));
 431                         goto out;
 432                 }
 433         }
 434
 435         gpo_ctx = talloc_new(frame);
 436         if (!gpo_ctx) {
 437                 PyErr_NoMemory();
 438                 goto out;
 439         }
 440         status = ads_get_gpo_list(self->ads_ptr, gpo_ctx, dn, flags, token,
 441                                   &gpo_list);
 442         if (!ADS_ERR_OK(status)) {
 443                 PyErr_Format(PyExc_RuntimeError,
 444                         "Failed to fetch GPO list: %s",
 445                         ads_errstr(status));
 446                 goto out;
 447         }
 448
 449         /* Convert the C linked list into a python list */
 450         list_size = 0;
 451         for (gpo = gpo_list; gpo != NULL; gpo = gpo->next) {
 452                 list_size++;
 453         }
 454
 455         i = 0;
 456         ret = PyList_New(list_size);
 457         if (ret == NULL) {
 458                 goto out;
 459         }
 460
 461         for (gpo = gpo_list; gpo != NULL; gpo = gpo->next) {
 462                 PyObject *obj = pytalloc_reference_ex(&GPOType,
 463                                                       gpo_ctx, gpo);
 464                 if (obj == NULL) {
 465                         Py_CLEAR(ret);
 466                         goto out;
 467                 }
 468
 469                 PyList_SetItem(ret, i, obj);
 470                 i++;
 471         }
 472
 473 out:
 474         TALLOC_FREE(gpo_ctx);
 475         TALLOC_FREE(frame);
 476         return ret;
 477 }
 478
 479 #endif
 480
 481 static PyMethodDef ADS_methods[] = {
 482         { "connect", (PyCFunction)py_ads_connect, METH_NOARGS,
 483                 "Connect to the LDAP server" },
 484 #ifdef HAVE_ADS
 485         { "get_gpo_list", (PyCFunction)py_ads_get_gpo_list, METH_VARARGS | METH_KEYWORDS,
 486                 NULL },
 487 #endif
 488         { NULL }
 489 };
 490
 491 static PyTypeObject ads_ADSType = {
 492         .tp_name = "gpo.ADS_STRUCT",
 493         .tp_basicsize = sizeof(ADS),
 494         .tp_dealloc = (destructor)py_ads_dealloc,
 495         .tp_flags = Py_TPFLAGS_DEFAULT,
 496         .tp_doc = "ADS struct",
 497         .tp_methods = ADS_methods,
 498         .tp_init = (initproc)py_ads_init,
 499         .tp_new = py_ads_new,
 500 };
 501
 502 static PyMethodDef py_gpo_methods[] = {
 503         {"gpo_get_sysvol_gpt_version",
 504                 (PyCFunction)py_gpo_get_sysvol_gpt_version,
 505                 METH_VARARGS, NULL},
 506         {NULL}
 507 };
 508
 509 static struct PyModuleDef moduledef = {
 510         PyModuleDef_HEAD_INIT,
 511         .m_name = "gpo",
 512         .m_doc = "libgpo python bindings",
 513         .m_size = -1,
 514         .m_methods = py_gpo_methods,
 515 };
 516
 517 /* Will be called by python when loading this module */
 518 void initgpo(void);
 519
 520 MODULE_INIT_FUNC(gpo)
 521 {
 522         PyObject *m;
 523
 524         debug_setup_talloc_log();
 525
 526         /* Instantiate the types */
 527         m = PyModule_Create(&moduledef);
 528         if (m == NULL) {
 529                 return m;
 530         }
 531
 532         PyModule_AddObject(m, "version",
 533                            PyStr_FromString(SAMBA_VERSION_STRING));
 534
 535         if (PyType_Ready(&ads_ADSType) < 0) {
 536                 return m;
 537         }
 538
 539         PyModule_AddObject(m, "ADS_STRUCT", (PyObject *)&ads_ADSType);
 540
 541         if (pytalloc_BaseObject_PyType_Ready(&GPOType) < 0) {
 542                 return m;
 543         }
 544
 545         Py_INCREF((PyObject *)(void *)&GPOType);
 546         PyModule_AddObject(m, "GROUP_POLICY_OBJECT",
 547                            (PyObject *)&GPOType);
 548         return m;
 549
 550 }