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         frame = talloc_stackframe();
  85
  86         if (!PyArg_ParseTupleAndKeywords(args, kwds, "|s",
  87                                          discard_const_p(char *, kwlist),
  88                                          &cache_dir)) {
  89                 PyErr_SetString(PyExc_SystemError,
  90                                 "Failed to parse arguments to "
  91                                 "gpo_get_unix_path()");
  92                 goto out;
  93         }
  94
  95         if (!cache_dir) {
  96                 cache_dir = cache_path(talloc_tos(), GPO_CACHE_DIR);
  97                 if (!cache_dir) {
  98                         PyErr_SetString(PyExc_MemoryError,
  99                                         "Failed to determine gpo cache dir");
 100                         goto out;
 101                 }
 102         }
 103
 104         status = gpo_get_unix_path(frame, cache_dir, gpo_ptr, &unix_path);
 105
 106         if (!NT_STATUS_IS_OK(status)) {
 107                 PyErr_SetString(PyExc_SystemError,
 108                                 "Failed to determine gpo unix path");
 109                 goto out;
 110         }
 111
 112         ret = PyStr_FromString(unix_path);
 113
 114 out:
 115         TALLOC_FREE(frame);
 116         return ret;
 117 }
 118
 119 static PyMethodDef GPO_methods[] = {
 120         {"get_unix_path", (PyCFunction)py_gpo_get_unix_path, METH_KEYWORDS,
 121                 NULL },
 122         {NULL}
 123 };
 124
 125 static PyTypeObject GPOType = {
 126         PyVarObject_HEAD_INIT(NULL, 0)
 127         .tp_name = "gpo.GROUP_POLICY_OBJECT",
 128         .tp_doc = "GROUP_POLICY_OBJECT",
 129         .tp_getset = GPO_setters,
 130         .tp_methods = GPO_methods,
 131         .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
 132 };
 133
 134 typedef struct {
 135         PyObject_HEAD
 136         ADS_STRUCT *ads_ptr;
 137         struct cli_credentials *cli_creds;
 138 } ADS;
 139
 140 static void py_ads_dealloc(ADS* self)
 141 {
 142         ads_destroy(&(self->ads_ptr));
 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 *py_creds = NULL;
 160         PyObject *lp_obj = NULL;
 161         struct loadparm_context *lp_ctx = NULL;
 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, &py_creds)) {
 169                 return -1;
 170         }
 171
 172         if (py_creds) {
 173                 if (!py_check_dcerpc_type(py_creds, "samba.credentials",
 174                                           "Credentials")) {
 175                         PyErr_Format(PyExc_TypeError,
 176                                      "Expected samba.credentials "
 177                                      "for credentials argument");
 178                         return -1;
 179                 }
 180                 self->cli_creds
 181                         = PyCredentials_AsCliCredentials(py_creds);
 182         }
 183
 184         if (lp_obj) {
 185                 bool ok = py_check_dcerpc_type(lp_obj, "samba.param",
 186                                                "LoadParm");
 187                 if (!ok) {
 188                         PyErr_Format(PyExc_TypeError,
 189                                      "Expected samba.param.LoadParm "
 190                                      "for lp argument");
 191                         return -1;
 192                 }
 193                 lp_ctx = pytalloc_get_type(lp_obj, struct loadparm_context);
 194                 if (lp_ctx == NULL) {
 195                         return -1;
 196                 }
 197                 ok = lp_load_initial_only(lp_ctx->szConfigFile);
 198                 if (!ok) {
 199                         return -1;
 200                 }
 201         }
 202
 203         if (self->cli_creds) {
 204                 realm = cli_credentials_get_realm(self->cli_creds);
 205                 workgroup = cli_credentials_get_domain(self->cli_creds);
 206         } else {
 207                 realm = lp_realm();
 208                 workgroup = lp_workgroup();
 209         }
 210
 211         if (ldap_server == NULL) {
 212                 return -1;
 213         }
 214
 215         self->ads_ptr = ads_init(realm, workgroup, ldap_server);
 216         if (self->ads_ptr == NULL) {
 217                 return -1;
 218         }
 219
 220         return 0;
 221 }
 222
 223 static PyObject* py_ads_connect(ADS *self)
 224 {
 225         ADS_STATUS status;
 226         TALLOC_CTX *frame = talloc_stackframe();
 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.flags |= ADS_AUTH_USER_CREDS;
 231                 self->ads_ptr->auth.password =
 232                         SMB_STRDUP(cli_credentials_get_password(self->cli_creds));
 233                 self->ads_ptr->auth.realm =
 234                         SMB_STRDUP(cli_credentials_get_realm(self->cli_creds));
 235
 236                 status = ads_connect_user_creds(self->ads_ptr);
 237                 if (!ADS_ERR_OK(status)) {
 238                         PyErr_SetString(PyExc_SystemError,
 239                                         "ads_connect() failed");
 240                         TALLOC_FREE(frame);
 241                         Py_RETURN_FALSE;
 242                 }
 243         } else {
 244                 char *passwd = NULL;
 245                 int ret = asprintf(&(self->ads_ptr->auth.user_name), "%s$",
 246                                    lp_netbios_name());
 247                 if (ret == -1) {
 248                         PyErr_SetString(PyExc_SystemError,
 249                                         "Failed to asprintf");
 250                         TALLOC_FREE(frame);
 251                         Py_RETURN_FALSE;
 252                 } else {
 253                         self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 254                 }
 255
 256                 if (!secrets_init()) {
 257                         PyErr_SetString(PyExc_SystemError,
 258                                         "secrets_init() failed");
 259                         TALLOC_FREE(frame);
 260                         Py_RETURN_FALSE;
 261                 }
 262
 263                 passwd = secrets_fetch_machine_password(self->ads_ptr->server.workgroup,
 264                                                         NULL, NULL);
 265                 if (passwd == NULL) {
 266                         PyErr_SetString(PyExc_SystemError,
 267                                         "Failed to fetch the machine account "
 268                                         "password");
 269                         TALLOC_FREE(frame);
 270                         Py_RETURN_FALSE;
 271                 }
 272                 self->ads_ptr->auth.password = smb_xstrdup(passwd);
 273                 SAFE_FREE(passwd);
 274                 self->ads_ptr->auth.realm =
 275                         smb_xstrdup(self->ads_ptr->server.realm);
 276                 if (!strupper_m(self->ads_ptr->auth.realm)) {
 277                         PyErr_SetString(PyExc_SystemError, "Failed to strdup");
 278                         TALLOC_FREE(frame);
 279                         Py_RETURN_FALSE;
 280                 }
 281
 282                 status = ads_connect(self->ads_ptr);
 283                 if (!ADS_ERR_OK(status)) {
 284                         PyErr_SetString(PyExc_SystemError,
 285                                         "ads_connect() failed");
 286                         TALLOC_FREE(frame);
 287                         Py_RETURN_FALSE;
 288                 }
 289         }
 290
 291         TALLOC_FREE(frame);
 292         Py_RETURN_TRUE;
 293 }
 294
 295 /* Parameter mapping and functions for the GP_EXT struct */
 296 void initgpo(void);
 297
 298 /* Global methods aka do not need a special pyobject type */
 299 static PyObject *py_gpo_get_sysvol_gpt_version(PyObject * self,
 300                                                PyObject * args)
 301 {
 302         TALLOC_CTX *tmp_ctx = NULL;
 303         char *unix_path;
 304         char *display_name = NULL;
 305         uint32_t sysvol_version = 0;
 306         PyObject *result;
 307         NTSTATUS status;
 308
 309         tmp_ctx = talloc_new(NULL);
 310
 311         if (!PyArg_ParseTuple(args, "s", &unix_path)) {
 312                 return NULL;
 313         }
 314         status = gpo_get_sysvol_gpt_version(tmp_ctx, unix_path,
 315                                             &sysvol_version,
 316                                             &display_name);
 317         if (!NT_STATUS_IS_OK(status)) {
 318                 PyErr_SetNTSTATUS(status);
 319                 TALLOC_FREE(tmp_ctx);
 320                 return NULL;
 321         }
 322
 323         talloc_free(tmp_ctx);
 324         result = Py_BuildValue("[s,i]", display_name, sysvol_version);
 325         return result;
 326 }
 327
 328 #ifdef HAVE_ADS
 329 static ADS_STATUS find_samaccount(ADS_STRUCT *ads, TALLOC_CTX *mem_ctx,
 330                                   const char *samaccountname,
 331                                   uint32_t *uac_ret, const char **dn_ret)
 332 {
 333         ADS_STATUS status;
 334         const char *attrs[] = { "userAccountControl", NULL };
 335         const char *filter;
 336         LDAPMessage *res = NULL;
 337         char *dn = NULL;
 338         uint32_t uac = 0;
 339
 340         filter = talloc_asprintf(mem_ctx, "(sAMAccountName=%s)",
 341                                  samaccountname);
 342         if (filter == NULL) {
 343                 status = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
 344                 goto out;
 345         }
 346
 347         status = ads_do_search_all(ads, ads->config.bind_path,
 348                                    LDAP_SCOPE_SUBTREE, filter, attrs, &res);
 349
 350         if (!ADS_ERR_OK(status)) {
 351                 goto out;
 352         }
 353
 354         if (ads_count_replies(ads, res) != 1) {
 355                 status = ADS_ERROR(LDAP_NO_RESULTS_RETURNED);
 356                 goto out;
 357         }
 358
 359         dn = ads_get_dn(ads, talloc_tos(), res);
 360         if (dn == NULL) {
 361                 status = ADS_ERROR(LDAP_NO_MEMORY);
 362                 goto out;
 363         }
 364
 365         if (!ads_pull_uint32(ads, res, "userAccountControl", &uac)) {
 366                 status = ADS_ERROR(LDAP_NO_SUCH_ATTRIBUTE);
 367                 goto out;
 368         }
 369
 370         if (uac_ret) {
 371                 *uac_ret = uac;
 372         }
 373
 374         if (dn_ret) {
 375                 *dn_ret = talloc_strdup(mem_ctx, dn);
 376                 if (*dn_ret == NULL) {
 377                         status = ADS_ERROR(LDAP_NO_MEMORY);
 378                         goto out;
 379                 }
 380         }
 381 out:
 382         TALLOC_FREE(dn);
 383         ads_msgfree(ads, res);
 384
 385         return status;
 386 }
 387
 388 static PyObject *py_ads_get_gpo_list(ADS *self, PyObject *args, PyObject *kwds)
 389 {
 390         TALLOC_CTX *frame = NULL;
 391         struct GROUP_POLICY_OBJECT *gpo = NULL, *gpo_list = NULL;
 392         ADS_STATUS status;
 393         const char *samaccountname = NULL;
 394         const char *dn = NULL;
 395         uint32_t uac = 0;
 396         uint32_t flags = 0;
 397         struct security_token *token = NULL;
 398         PyObject *ret = Py_None;
 399         TALLOC_CTX *gpo_ctx;
 400         size_t list_size;
 401         size_t i;
 402
 403         static const char *kwlist[] = {"samaccountname", NULL};
 404         if (!PyArg_ParseTupleAndKeywords(args, kwds, "s",
 405                                          discard_const_p(char *, kwlist),
 406                                          &samaccountname)) {
 407                 PyErr_SetString(PyExc_SystemError,
 408                                 "Failed to parse arguments to "
 409                                 "py_ads_get_gpo_list()");
 410                 goto out;
 411         }
 412
 413         frame = talloc_stackframe();
 414
 415         status = find_samaccount(self->ads_ptr, frame,
 416                                  samaccountname, &uac, &dn);
 417         if (!ADS_ERR_OK(status)) {
 418                 TALLOC_FREE(frame);
 419                 PyErr_SetString(PyExc_SystemError,
 420                                 "Failed to find samAccountName");
 421                 goto out;
 422         }
 423
 424         if (uac & UF_WORKSTATION_TRUST_ACCOUNT ||
 425             uac & UF_SERVER_TRUST_ACCOUNT) {
 426                 flags |= GPO_LIST_FLAG_MACHINE;
 427                 status = gp_get_machine_token(self->ads_ptr, frame, dn,
 428                                               &token);
 429         } else {
 430                 status = ads_get_sid_token(self->ads_ptr, frame, dn, &token);
 431         }
 432         if (!ADS_ERR_OK(status)) {
 433                 TALLOC_FREE(frame);
 434                 PyErr_SetString(PyExc_SystemError, "Failed to get token");
 435                 goto out;
 436         }
 437
 438         gpo_ctx = talloc_new(frame);
 439         status = ads_get_gpo_list(self->ads_ptr, gpo_ctx, dn, flags, token,
 440                                   &gpo_list);
 441         if (!ADS_ERR_OK(status)) {
 442                 TALLOC_FREE(frame);
 443                 PyErr_SetString(PyExc_SystemError, "Failed to fetch GPO list");
 444                 goto out;
 445         }
 446
 447         /* Convert the C linked list into a python list */
 448         list_size = 0;
 449         for (gpo = gpo_list; gpo != NULL; gpo = gpo->next) {
 450                 list_size++;
 451         }
 452
 453         i = 0;
 454         ret = PyList_New(list_size);
 455         if (ret == NULL) {
 456                 TALLOC_FREE(frame);
 457                 goto out;
 458         }
 459
 460         for (gpo = gpo_list; gpo != NULL; gpo = gpo->next) {
 461                 PyObject *obj = pytalloc_reference_ex(&GPOType,
 462                                                       gpo_ctx, gpo);
 463                 if (obj == NULL) {
 464                         TALLOC_FREE(frame);
 465                         goto out;
 466                 }
 467
 468                 PyList_SetItem(ret, i, obj);
 469                 i++;
 470         }
 471
 472 out:
 473
 474         TALLOC_FREE(frame);
 475         return ret;
 476 }
 477
 478 #endif
 479
 480 static PyMethodDef ADS_methods[] = {
 481         { "connect", (PyCFunction)py_ads_connect, METH_NOARGS,
 482                 "Connect to the LDAP server" },
 483 #ifdef HAVE_ADS
 484         { "get_gpo_list", (PyCFunction)py_ads_get_gpo_list, METH_VARARGS | METH_KEYWORDS,
 485                 NULL },
 486 #endif
 487         { NULL }
 488 };
 489
 490 static PyTypeObject ads_ADSType = {
 491         .tp_name = "gpo.ADS_STRUCT",
 492         .tp_basicsize = sizeof(ADS),
 493         .tp_dealloc = (destructor)py_ads_dealloc,
 494         .tp_flags = Py_TPFLAGS_DEFAULT,
 495         .tp_doc = "ADS struct",
 496         .tp_methods = ADS_methods,
 497         .tp_init = (initproc)py_ads_init,
 498         .tp_new = py_ads_new,
 499 };
 500
 501 static PyMethodDef py_gpo_methods[] = {
 502         {"gpo_get_sysvol_gpt_version",
 503                 (PyCFunction)py_gpo_get_sysvol_gpt_version,
 504                 METH_VARARGS, NULL},
 505         {NULL}
 506 };
 507
 508 static struct PyModuleDef moduledef = {
 509         PyModuleDef_HEAD_INIT,
 510         .m_name = "gpo",
 511         .m_doc = "libgpo python bindings",
 512         .m_size = -1,
 513         .m_methods = py_gpo_methods,
 514 };
 515
 516 /* Will be called by python when loading this module */
 517 void initgpo(void);
 518
 519 MODULE_INIT_FUNC(gpo)
 520 {
 521         PyObject *m;
 522
 523         debug_setup_talloc_log();
 524
 525         /* Instantiate the types */
 526         m = PyModule_Create(&moduledef);
 527         if (m == NULL) {
 528                 return m;
 529         }
 530
 531         PyModule_AddObject(m, "version",
 532                            PyStr_FromString(SAMBA_VERSION_STRING));
 533
 534         if (PyType_Ready(&ads_ADSType) < 0) {
 535                 return m;
 536         }
 537
 538         PyModule_AddObject(m, "ADS_STRUCT", (PyObject *)&ads_ADSType);
 539
 540         if (pytalloc_BaseObject_PyType_Ready(&GPOType) < 0) {
 541                 return m;
 542         }
 543
 544         Py_INCREF((PyObject *)(void *)&GPOType);
 545         PyModule_AddObject(m, "GROUP_POLICY_OBJECT",
 546                            (PyObject *)&GPOType);
 547         return m;
 548
 549 }