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_connect(ADS *self);
 147 static int py_ads_init(ADS *self, PyObject *args, PyObject *kwds)
 148 {
 149         const char *realm = NULL;
 150         const char *workgroup = NULL;
 151         const char *ldap_server = NULL;
 152         PyObject *lp_obj = NULL;
 153         PyObject *py_creds = NULL;
 154         struct loadparm_context *lp_ctx = NULL;
 155         bool ok = false;
 156
 157         static const char *kwlist[] = {
 158                 "ldap_server", "loadparm_context", "credentials", NULL
 159         };
 160         if (!PyArg_ParseTupleAndKeywords(args, kwds, "sO|O",
 161                                          discard_const_p(char *, kwlist),
 162                                          &ldap_server, &lp_obj, &py_creds)) {
 163                 return -1;
 164         }
 165         /* keep reference to the credentials. Clear any earlier ones */
 166         Py_CLEAR(self->py_creds);
 167         self->cli_creds = NULL;
 168         self->py_creds = py_creds;
 169         Py_XINCREF(self->py_creds);
 170
 171         if (self->py_creds) {
 172                 ok = py_check_dcerpc_type(self->py_creds, "samba.credentials",
 173                                           "Credentials");
 174                 if (!ok) {
 175                         return -1;
 176                 }
 177                 self->cli_creds
 178                         = PyCredentials_AsCliCredentials(self->py_creds);
 179         }
 180
 181         ok = py_check_dcerpc_type(lp_obj, "samba.param", "LoadParm");
 182         if (!ok) {
 183                 return -1;
 184         }
 185         lp_ctx = pytalloc_get_type(lp_obj, struct loadparm_context);
 186         if (lp_ctx == NULL) {
 187                 return -1;
 188         }
 189         ok = lp_load_initial_only(lp_ctx->szConfigFile);
 190         if (!ok) {
 191                 PyErr_Format(PyExc_RuntimeError, "Could not load config file '%s'",
 192                                 lp_ctx->szConfigFile);
 193                 return -1;
 194         }
 195
 196         if (self->cli_creds) {
 197                 realm = cli_credentials_get_realm(self->cli_creds);
 198                 workgroup = cli_credentials_get_domain(self->cli_creds);
 199         } else {
 200                 realm = lp_realm();
 201                 workgroup = lp_workgroup();
 202         }
 203
 204         /* in case __init__ is called more than once */
 205         if (self->ads_ptr) {
 206                 ads_destroy(&self->ads_ptr);
 207                 self->ads_ptr = NULL;
 208         }
 209         /* always succeeds or crashes */
 210         self->ads_ptr = ads_init(realm, workgroup, ldap_server);
 211
 212         return 0;
 213 }
 214
 215 /* connect.  Failure to connect results in an Exception */
 216 static PyObject* py_ads_connect(ADS *self)
 217 {
 218         ADS_STATUS status;
 219         TALLOC_CTX *frame = talloc_stackframe();
 220         if (!self->ads_ptr) {
 221                 PyErr_SetString(PyExc_RuntimeError, "Uninitialized");
 222                 return NULL;
 223         }
 224         SAFE_FREE(self->ads_ptr->auth.user_name);
 225         SAFE_FREE(self->ads_ptr->auth.password);
 226         SAFE_FREE(self->ads_ptr->auth.realm);
 227         if (self->cli_creds) {
 228                 self->ads_ptr->auth.user_name =
 229                         SMB_STRDUP(cli_credentials_get_username(self->cli_creds));
 230                 self->ads_ptr->auth.password =
 231                         SMB_STRDUP(cli_credentials_get_password(self->cli_creds));
 232                 self->ads_ptr->auth.realm =
 233                         SMB_STRDUP(cli_credentials_get_realm(self->cli_creds));
 234                 self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 235                 status = ads_connect_user_creds(self->ads_ptr);
 236         } else {
 237                 char *passwd = NULL;
 238                 int ret;
 239                 if (!secrets_init()) {
 240                         PyErr_SetString(PyExc_RuntimeError,
 241                                         "secrets_init() failed");
 242                         goto err;
 243                 }
 244
 245                 passwd = secrets_fetch_machine_password(self->ads_ptr->server.workgroup,
 246                                                         NULL, NULL);
 247                 if (passwd == NULL) {
 248                         PyErr_SetString(PyExc_RuntimeError,
 249                                         "Failed to fetch the machine account "
 250                                         "password");
 251                         goto err;
 252                 }
 253                 ret = asprintf(&(self->ads_ptr->auth.user_name), "%s$",
 254                                    lp_netbios_name());
 255                 if (ret == -1) {
 256                         SAFE_FREE(passwd);
 257                         PyErr_NoMemory();
 258                         goto err;
 259                 }
 260                 self->ads_ptr->auth.password = passwd; /* take ownership of this data */
 261                 self->ads_ptr->auth.realm =
 262                         SMB_STRDUP(self->ads_ptr->server.realm);
 263                 if (!strupper_m(self->ads_ptr->auth.realm)) {
 264                         PyErr_SetString(PyExc_RuntimeError, "Failed to strupper");
 265                         goto err;
 266                 }
 267                 self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 268                 status = ads_connect(self->ads_ptr);
 269         }
 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         TALLOC_FREE(frame);
 278         Py_RETURN_TRUE;
 279
 280 err:
 281         TALLOC_FREE(frame);
 282         return NULL;
 283 }
 284
 285 /* Parameter mapping and functions for the GP_EXT struct */
 286 void initgpo(void);
 287
 288 /* Global methods aka do not need a special pyobject type */
 289 static PyObject *py_gpo_get_sysvol_gpt_version(PyObject * self,
 290                                                PyObject * args)
 291 {
 292         TALLOC_CTX *tmp_ctx = NULL;
 293         char *unix_path;
 294         char *display_name = NULL;
 295         uint32_t sysvol_version = 0;
 296         PyObject *result;
 297         NTSTATUS status;
 298
 299         if (!PyArg_ParseTuple(args, "s", &unix_path)) {
 300                 return NULL;
 301         }
 302         tmp_ctx = talloc_new(NULL);
 303         if (!tmp_ctx) {
 304                 return PyErr_NoMemory();
 305         }
 306         status = gpo_get_sysvol_gpt_version(tmp_ctx, unix_path,
 307                                             &sysvol_version,
 308                                             &display_name);
 309         if (!NT_STATUS_IS_OK(status)) {
 310                 PyErr_SetNTSTATUS(status);
 311                 TALLOC_FREE(tmp_ctx);
 312                 return NULL;
 313         }
 314
 315         result = Py_BuildValue("[s,i]", display_name, sysvol_version);
 316         talloc_free(tmp_ctx);
 317         return result;
 318 }
 319
 320 #ifdef HAVE_ADS
 321 static ADS_STATUS find_samaccount(ADS_STRUCT *ads, TALLOC_CTX *mem_ctx,
 322                                   const char *samaccountname,
 323                                   uint32_t *uac_ret, const char **dn_ret)
 324 {
 325         ADS_STATUS status;
 326         const char *attrs[] = { "userAccountControl", NULL };
 327         const char *filter;
 328         LDAPMessage *res = NULL;
 329         char *dn = NULL;
 330         uint32_t uac = 0;
 331
 332         filter = talloc_asprintf(mem_ctx, "(sAMAccountName=%s)",
 333                                  samaccountname);
 334         if (filter == NULL) {
 335                 status = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
 336                 goto out;
 337         }
 338
 339         status = ads_do_search_all(ads, ads->config.bind_path,
 340                                    LDAP_SCOPE_SUBTREE, filter, attrs, &res);
 341
 342         if (!ADS_ERR_OK(status)) {
 343                 goto out;
 344         }
 345
 346         if (ads_count_replies(ads, res) != 1) {
 347                 status = ADS_ERROR(LDAP_NO_RESULTS_RETURNED);
 348                 goto out;
 349         }
 350
 351         dn = ads_get_dn(ads, talloc_tos(), res);
 352         if (dn == NULL) {
 353                 status = ADS_ERROR(LDAP_NO_MEMORY);
 354                 goto out;
 355         }
 356
 357         if (!ads_pull_uint32(ads, res, "userAccountControl", &uac)) {
 358                 status = ADS_ERROR(LDAP_NO_SUCH_ATTRIBUTE);
 359                 goto out;
 360         }
 361
 362         if (uac_ret) {
 363                 *uac_ret = uac;
 364         }
 365
 366         if (dn_ret) {
 367                 *dn_ret = talloc_strdup(mem_ctx, dn);
 368                 if (*dn_ret == NULL) {
 369                         status = ADS_ERROR(LDAP_NO_MEMORY);
 370                         goto out;
 371                 }
 372         }
 373 out:
 374         TALLOC_FREE(dn);
 375         ads_msgfree(ads, res);
 376
 377         return status;
 378 }
 379
 380 static PyObject *py_ads_get_gpo_list(ADS *self, PyObject *args, PyObject *kwds)
 381 {
 382         TALLOC_CTX *frame = NULL;
 383         struct GROUP_POLICY_OBJECT *gpo = NULL, *gpo_list = NULL;
 384         ADS_STATUS status;
 385         const char *samaccountname = NULL;
 386         const char *dn = NULL;
 387         uint32_t uac = 0;
 388         uint32_t flags = 0;
 389         struct security_token *token = NULL;
 390         PyObject *ret = NULL;
 391         TALLOC_CTX *gpo_ctx = NULL;
 392         size_t list_size;
 393         size_t i;
 394
 395         static const char *kwlist[] = {"samaccountname", NULL};
 396         if (!PyArg_ParseTupleAndKeywords(args, kwds, "s",
 397                                          discard_const_p(char *, kwlist),
 398                                          &samaccountname)) {
 399                 return NULL;
 400         }
 401         if (!self->ads_ptr) {
 402                 PyErr_SetString(PyExc_RuntimeError, "Uninitialized");
 403                 return NULL;
 404         }
 405
 406         frame = talloc_stackframe();
 407
 408         status = find_samaccount(self->ads_ptr, frame,
 409                                  samaccountname, &uac, &dn);
 410         if (!ADS_ERR_OK(status)) {
 411                 PyErr_Format(PyExc_RuntimeError,
 412                                 "Failed to find samAccountName '%s': %s",
 413                                 samaccountname, ads_errstr(status));
 414                 goto out;
 415         }
 416
 417         if (uac & UF_WORKSTATION_TRUST_ACCOUNT ||
 418             uac & UF_SERVER_TRUST_ACCOUNT) {
 419                 flags |= GPO_LIST_FLAG_MACHINE;
 420                 status = gp_get_machine_token(self->ads_ptr, frame, dn,
 421                                               &token);
 422                 if (!ADS_ERR_OK(status)) {
 423                         PyErr_Format(PyExc_RuntimeError,
 424                                 "Failed to get machine token for '%s'(%s): %s",
 425                                 samaccountname, dn, ads_errstr(status));
 426                         goto out;
 427                 }
 428         } else {
 429                 status = ads_get_sid_token(self->ads_ptr, frame, dn, &token);
 430                 if (!ADS_ERR_OK(status)) {
 431                         PyErr_Format(PyExc_RuntimeError,
 432                                 "Failed to get sid token for '%s'(%s): %s",
 433                                 samaccountname, dn, ads_errstr(status));
 434                         goto out;
 435                 }
 436         }
 437
 438         gpo_ctx = talloc_new(frame);
 439         if (!gpo_ctx) {
 440                 PyErr_NoMemory();
 441                 goto out;
 442         }
 443         status = ads_get_gpo_list(self->ads_ptr, gpo_ctx, dn, flags, token,
 444                                   &gpo_list);
 445         if (!ADS_ERR_OK(status)) {
 446                 PyErr_Format(PyExc_RuntimeError,
 447                         "Failed to fetch GPO list: %s",
 448                         ads_errstr(status));
 449                 goto out;
 450         }
 451
 452         /* Convert the C linked list into a python list */
 453         list_size = 0;
 454         for (gpo = gpo_list; gpo != NULL; gpo = gpo->next) {
 455                 list_size++;
 456         }
 457
 458         i = 0;
 459         ret = PyList_New(list_size);
 460         if (ret == NULL) {
 461                 goto out;
 462         }
 463
 464         for (gpo = gpo_list; gpo != NULL; gpo = gpo->next) {
 465                 PyObject *obj = pytalloc_reference_ex(&GPOType,
 466                                                       gpo_ctx, gpo);
 467                 if (obj == NULL) {
 468                         Py_CLEAR(ret);
 469                         goto out;
 470                 }
 471
 472                 PyList_SetItem(ret, i, obj);
 473                 i++;
 474         }
 475
 476 out:
 477         TALLOC_FREE(gpo_ctx);
 478         TALLOC_FREE(frame);
 479         return ret;
 480 }
 481
 482 #endif
 483
 484 static PyMethodDef ADS_methods[] = {
 485         { "connect", (PyCFunction)py_ads_connect, METH_NOARGS,
 486                 "Connect to the LDAP server" },
 487 #ifdef HAVE_ADS
 488         { "get_gpo_list", (PyCFunction)py_ads_get_gpo_list, METH_VARARGS | METH_KEYWORDS,
 489                 NULL },
 490 #endif
 491         { NULL }
 492 };
 493
 494 static PyTypeObject ads_ADSType = {
 495         .tp_name = "gpo.ADS_STRUCT",
 496         .tp_basicsize = sizeof(ADS),
 497         .tp_dealloc = (destructor)py_ads_dealloc,
 498         .tp_flags = Py_TPFLAGS_DEFAULT,
 499         .tp_doc = "ADS struct",
 500         .tp_methods = ADS_methods,
 501         .tp_init = (initproc)py_ads_init,
 502 };
 503
 504 static PyMethodDef py_gpo_methods[] = {
 505         {"gpo_get_sysvol_gpt_version",
 506                 (PyCFunction)py_gpo_get_sysvol_gpt_version,
 507                 METH_VARARGS, NULL},
 508         {NULL}
 509 };
 510
 511 static struct PyModuleDef moduledef = {
 512         PyModuleDef_HEAD_INIT,
 513         .m_name = "gpo",
 514         .m_doc = "libgpo python bindings",
 515         .m_size = -1,
 516         .m_methods = py_gpo_methods,
 517 };
 518
 519 /* Will be called by python when loading this module */
 520 void initgpo(void);
 521
 522 MODULE_INIT_FUNC(gpo)
 523 {
 524         PyObject *m;
 525
 526         debug_setup_talloc_log();
 527
 528         /* Instantiate the types */
 529         m = PyModule_Create(&moduledef);
 530         if (m == NULL) {
 531                 goto err;
 532         }
 533
 534         if (PyModule_AddObject(m, "version",
 535                            PyStr_FromString(SAMBA_VERSION_STRING)) ) {
 536                 goto err;
 537         }
 538
 539         ads_ADSType.tp_new = PyType_GenericNew;
 540         if (PyType_Ready(&ads_ADSType) < 0) {
 541                 goto err;
 542         }
 543
 544         Py_INCREF(&ads_ADSType);
 545         if (PyModule_AddObject(m, "ADS_STRUCT", (PyObject *)&ads_ADSType)) {
 546                 goto err;
 547         }
 548
 549         if (pytalloc_BaseObject_PyType_Ready(&GPOType) < 0) {
 550                 goto err;
 551         }
 552
 553         Py_INCREF((PyObject *)(void *)&GPOType);
 554         if (PyModule_AddObject(m, "GROUP_POLICY_OBJECT",
 555                            (PyObject *)&GPOType)) {
 556                 goto err;
 557         }
 558         return m;
 559
 560 err:
 561         Py_CLEAR(m);
 562         return NULL;
 563 }