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 = Py_None;
  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         if (!PyArg_ParseTupleAndKeywords(args, kwds, "|s",
  85                                          discard_const_p(char *, kwlist),
  86                                          &cache_dir)) {
  87                 PyErr_SetString(PyExc_SystemError,
  88                                 "Failed to parse arguments to "
  89                                 "gpo_get_unix_path()");
  90                 goto out;
  91         }
  92
  93         if (!cache_dir) {
  94                 cache_dir = cache_path(GPO_CACHE_DIR);
  95                 if (!cache_dir) {
  96                         PyErr_SetString(PyExc_MemoryError,
  97                                         "Failed to determine gpo cache dir");
  98                         goto out;
  99                 }
 100         }
 101
 102         frame = talloc_stackframe();
 103
 104         status = gpo_get_unix_path(frame, cache_dir, gpo_ptr, &unix_path);
 105
 106         TALLOC_FREE(frame);
 107
 108         if (!NT_STATUS_IS_OK(status)) {
 109                 PyErr_SetString(PyExc_SystemError,
 110                                 "Failed to determine gpo unix path");
 111                 goto out;
 112         }
 113
 114         ret = PyStr_FromString(unix_path);
 115
 116 out:
 117         return ret;
 118 }
 119
 120 static PyMethodDef GPO_methods[] = {
 121         {"get_unix_path", (PyCFunction)py_gpo_get_unix_path, METH_KEYWORDS,
 122                 NULL },
 123         {NULL}
 124 };
 125
 126 static PyTypeObject GPOType = {
 127         PyVarObject_HEAD_INIT(NULL, 0)
 128         .tp_name = "gpo.GROUP_POLICY_OBJECT",
 129         .tp_doc = "GROUP_POLICY_OBJECT",
 130         .tp_getset = GPO_setters,
 131         .tp_methods = GPO_methods,
 132         .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
 133 };
 134
 135 typedef struct {
 136         PyObject_HEAD
 137         ADS_STRUCT *ads_ptr;
 138         struct cli_credentials *cli_creds;
 139 } ADS;
 140
 141 static void py_ads_dealloc(ADS* self)
 142 {
 143         ads_destroy(&(self->ads_ptr));
 144         Py_TYPE(self)->tp_free((PyObject*)self);
 145 }
 146
 147 static PyObject* py_ads_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 148 {
 149         ADS *self;
 150         self = (ADS*)type->tp_alloc(type, 0);
 151         return (PyObject*)self;
 152 }
 153
 154 static PyObject* py_ads_connect(ADS *self);
 155 static int py_ads_init(ADS *self, PyObject *args, PyObject *kwds)
 156 {
 157         const char *realm = NULL;
 158         const char *workgroup = NULL;
 159         const char *ldap_server = NULL;
 160         PyObject *py_creds = NULL;
 161         PyObject *lp_obj = NULL;
 162         struct loadparm_context *lp_ctx = NULL;
 163
 164         static const char *kwlist[] = {
 165                 "ldap_server", "loadparm_context", "credentials", NULL
 166         };
 167         if (!PyArg_ParseTupleAndKeywords(args, kwds, "sO|O",
 168                                          discard_const_p(char *, kwlist),
 169                                          &ldap_server, &lp_obj, &py_creds)) {
 170                 return -1;
 171         }
 172
 173         if (py_creds) {
 174                 if (!py_check_dcerpc_type(py_creds, "samba.credentials",
 175                                           "Credentials")) {
 176                         PyErr_Format(PyExc_TypeError,
 177                                      "Expected samba.credentials "
 178                                      "for credentials argument");
 179                         return -1;
 180                 }
 181                 self->cli_creds
 182                         = PyCredentials_AsCliCredentials(py_creds);
 183         }
 184
 185         if (lp_obj) {
 186                 bool ok = py_check_dcerpc_type(lp_obj, "samba.param",
 187                                                "LoadParm");
 188                 if (!ok) {
 189                         PyErr_Format(PyExc_TypeError,
 190                                      "Expected samba.param.LoadParm "
 191                                      "for lp argument");
 192                         return -1;
 193                 }
 194                 lp_ctx = pytalloc_get_type(lp_obj, struct loadparm_context);
 195                 if (lp_ctx == NULL) {
 196                         return -1;
 197                 }
 198                 ok = lp_load_initial_only(lp_ctx->szConfigFile);
 199                 if (!ok) {
 200                         return -1;
 201                 }
 202         }
 203
 204         if (self->cli_creds) {
 205                 realm = cli_credentials_get_realm(self->cli_creds);
 206                 workgroup = cli_credentials_get_domain(self->cli_creds);
 207         } else {
 208                 realm = lp_realm();
 209                 workgroup = lp_workgroup();
 210         }
 211
 212         if (ldap_server == NULL) {
 213                 return -1;
 214         }
 215
 216         self->ads_ptr = ads_init(realm, workgroup, ldap_server);
 217         if (self->ads_ptr == NULL) {
 218                 return -1;
 219         }
 220
 221         return 0;
 222 }
 223
 224 static PyObject* py_ads_connect(ADS *self)
 225 {
 226         ADS_STATUS status;
 227         TALLOC_CTX *frame = talloc_stackframe();
 228         if (self->cli_creds) {
 229                 self->ads_ptr->auth.user_name =
 230                         SMB_STRDUP(cli_credentials_get_username(self->cli_creds));
 231                 self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 232                 self->ads_ptr->auth.password =
 233                         SMB_STRDUP(cli_credentials_get_password(self->cli_creds));
 234                 self->ads_ptr->auth.realm =
 235                         SMB_STRDUP(cli_credentials_get_realm(self->cli_creds));
 236
 237                 status = ads_connect_user_creds(self->ads_ptr);
 238                 if (!ADS_ERR_OK(status)) {
 239                         PyErr_SetString(PyExc_SystemError,
 240                                         "ads_connect() failed");
 241                         TALLOC_FREE(frame);
 242                         Py_RETURN_FALSE;
 243                 }
 244         } else {
 245                 char *passwd = NULL;
 246                 int ret = asprintf(&(self->ads_ptr->auth.user_name), "%s$",
 247                                    lp_netbios_name());
 248                 if (ret == -1) {
 249                         PyErr_SetString(PyExc_SystemError,
 250                                         "Failed to asprintf");
 251                         TALLOC_FREE(frame);
 252                         Py_RETURN_FALSE;
 253                 } else {
 254                         self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 255                 }
 256
 257                 if (!secrets_init()) {
 258                         PyErr_SetString(PyExc_SystemError,
 259                                         "secrets_init() failed");
 260                         TALLOC_FREE(frame);
 261                         Py_RETURN_FALSE;
 262                 }
 263
 264                 passwd = secrets_fetch_machine_password(self->ads_ptr->server.workgroup,
 265                                                         NULL, NULL);
 266                 if (passwd == NULL) {
 267                         PyErr_SetString(PyExc_SystemError,
 268                                         "Failed to fetch the machine account "
 269                                         "password");
 270                         TALLOC_FREE(frame);
 271                         Py_RETURN_FALSE;
 272                 }
 273                 self->ads_ptr->auth.password = smb_xstrdup(passwd);
 274                 SAFE_FREE(passwd);
 275                 self->ads_ptr->auth.realm =
 276                         smb_xstrdup(self->ads_ptr->server.realm);
 277                 if (!strupper_m(self->ads_ptr->auth.realm)) {
 278                         PyErr_SetString(PyExc_SystemError, "Failed to strdup");
 279                         TALLOC_FREE(frame);
 280                         Py_RETURN_FALSE;
 281                 }
 282
 283                 status = ads_connect(self->ads_ptr);
 284                 if (!ADS_ERR_OK(status)) {
 285                         PyErr_SetString(PyExc_SystemError,
 286                                         "ads_connect() failed");
 287                         TALLOC_FREE(frame);
 288                         Py_RETURN_FALSE;
 289                 }
 290         }
 291
 292         TALLOC_FREE(frame);
 293         Py_RETURN_TRUE;
 294 }
 295
 296 /* Parameter mapping and functions for the GP_EXT struct */
 297 void initgpo(void);
 298
 299 /* Global methods aka do not need a special pyobject type */
 300 static PyObject *py_gpo_get_sysvol_gpt_version(PyObject * self,
 301                                                PyObject * args)
 302 {
 303         TALLOC_CTX *tmp_ctx = NULL;
 304         char *unix_path;
 305         char *display_name = NULL;
 306         uint32_t sysvol_version = 0;
 307         PyObject *result;
 308         NTSTATUS status;
 309
 310         tmp_ctx = talloc_new(NULL);
 311
 312         if (!PyArg_ParseTuple(args, "s", &unix_path)) {
 313                 return NULL;
 314         }
 315         status = gpo_get_sysvol_gpt_version(tmp_ctx, unix_path,
 316                                             &sysvol_version,
 317                                             &display_name);
 318         if (!NT_STATUS_IS_OK(status)) {
 319                 PyErr_SetNTSTATUS(status);
 320                 TALLOC_FREE(tmp_ctx);
 321                 return NULL;
 322         }
 323
 324         talloc_free(tmp_ctx);
 325         result = Py_BuildValue("[s,i]", display_name, sysvol_version);
 326         return result;
 327 }
 328
 329 #ifdef HAVE_ADS
 330 static ADS_STATUS find_samaccount(ADS_STRUCT *ads, TALLOC_CTX *mem_ctx,
 331                                   const char *samaccountname,
 332                                   uint32_t *uac_ret, const char **dn_ret)
 333 {
 334         ADS_STATUS status;
 335         const char *attrs[] = { "userAccountControl", NULL };
 336         const char *filter;
 337         LDAPMessage *res = NULL;
 338         char *dn = NULL;
 339         uint32_t uac = 0;
 340
 341         filter = talloc_asprintf(mem_ctx, "(sAMAccountName=%s)",
 342                                  samaccountname);
 343         if (filter == NULL) {
 344                 status = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
 345                 goto out;
 346         }
 347
 348         status = ads_do_search_all(ads, ads->config.bind_path,
 349                                    LDAP_SCOPE_SUBTREE, filter, attrs, &res);
 350
 351         if (!ADS_ERR_OK(status)) {
 352                 goto out;
 353         }
 354
 355         if (ads_count_replies(ads, res) != 1) {
 356                 status = ADS_ERROR(LDAP_NO_RESULTS_RETURNED);
 357                 goto out;
 358         }
 359
 360         dn = ads_get_dn(ads, talloc_tos(), res);
 361         if (dn == NULL) {
 362                 status = ADS_ERROR(LDAP_NO_MEMORY);
 363                 goto out;
 364         }
 365
 366         if (!ads_pull_uint32(ads, res, "userAccountControl", &uac)) {
 367                 status = ADS_ERROR(LDAP_NO_SUCH_ATTRIBUTE);
 368                 goto out;
 369         }
 370
 371         if (uac_ret) {
 372                 *uac_ret = uac;
 373         }
 374
 375         if (dn_ret) {
 376                 *dn_ret = talloc_strdup(mem_ctx, dn);
 377                 if (*dn_ret == NULL) {
 378                         status = ADS_ERROR(LDAP_NO_MEMORY);
 379                         goto out;
 380                 }
 381         }
 382 out:
 383         TALLOC_FREE(dn);
 384         ads_msgfree(ads, res);
 385
 386         return status;
 387 }
 388
 389 static PyObject *py_ads_get_gpo_list(ADS *self, PyObject *args, PyObject *kwds)
 390 {
 391         TALLOC_CTX *frame = NULL;
 392         struct GROUP_POLICY_OBJECT *gpo = NULL, *gpo_list = NULL;
 393         ADS_STATUS status;
 394         const char *samaccountname = NULL;
 395         const char *dn = NULL;
 396         uint32_t uac = 0;
 397         uint32_t flags = 0;
 398         struct security_token *token = NULL;
 399         PyObject *ret = Py_None;
 400         TALLOC_CTX *gpo_ctx;
 401         size_t list_size;
 402         size_t i;
 403
 404         static const char *kwlist[] = {"samaccountname", NULL};
 405         if (!PyArg_ParseTupleAndKeywords(args, kwds, "s",
 406                                          discard_const_p(char *, kwlist),
 407                                          &samaccountname)) {
 408                 PyErr_SetString(PyExc_SystemError,
 409                                 "Failed to parse arguments to "
 410                                 "py_ads_get_gpo_list()");
 411                 goto out;
 412         }
 413
 414         frame = talloc_stackframe();
 415
 416         status = find_samaccount(self->ads_ptr, frame,
 417                                  samaccountname, &uac, &dn);
 418         if (!ADS_ERR_OK(status)) {
 419                 TALLOC_FREE(frame);
 420                 PyErr_SetString(PyExc_SystemError,
 421                                 "Failed to find samAccountName");
 422                 goto out;
 423         }
 424
 425         if (uac & UF_WORKSTATION_TRUST_ACCOUNT ||
 426             uac & UF_SERVER_TRUST_ACCOUNT) {
 427                 flags |= GPO_LIST_FLAG_MACHINE;
 428                 status = gp_get_machine_token(self->ads_ptr, frame, dn,
 429                                               &token);
 430         } else {
 431                 status = ads_get_sid_token(self->ads_ptr, frame, dn, &token);
 432         }
 433         if (!ADS_ERR_OK(status)) {
 434                 TALLOC_FREE(frame);
 435                 PyErr_SetString(PyExc_SystemError, "Failed to get token");
 436                 goto out;
 437         }
 438
 439         gpo_ctx = talloc_new(frame);
 440         status = ads_get_gpo_list(self->ads_ptr, gpo_ctx, dn, flags, token,
 441                                   &gpo_list);
 442         if (!ADS_ERR_OK(status)) {
 443                 TALLOC_FREE(frame);
 444                 PyErr_SetString(PyExc_SystemError, "Failed to fetch GPO list");
 445                 goto out;
 446         }
 447
 448         /* Convert the C linked list into a python list */
 449         list_size = 0;
 450         for (gpo = gpo_list; gpo != NULL; gpo = gpo->next) {
 451                 list_size++;
 452         }
 453
 454         i = 0;
 455         ret = PyList_New(list_size);
 456         if (ret == NULL) {
 457                 TALLOC_FREE(frame);
 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                         TALLOC_FREE(frame);
 466                         goto out;
 467                 }
 468
 469                 PyList_SetItem(ret, i, obj);
 470                 i++;
 471         }
 472
 473 out:
 474
 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 }