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
  31 /* A Python C API module to use LIBGPO */
  32
  33 #define GPO_getter(ATTR) \
  34 static PyObject* GPO_get_##ATTR(PyObject *self, void *closure) \
  35 { \
  36         struct GROUP_POLICY_OBJECT *gpo_ptr \
  37                 = pytalloc_get_ptr(self); \
  38         \
  39         if (gpo_ptr->ATTR) \
  40                 return PyString_FromString(gpo_ptr->ATTR); \
  41         else \
  42                 return Py_None; \
  43 }
  44 GPO_getter(ds_path)
  45 GPO_getter(file_sys_path)
  46 GPO_getter(display_name)
  47 GPO_getter(name)
  48 GPO_getter(link)
  49 GPO_getter(user_extensions)
  50 GPO_getter(machine_extensions)
  51
  52 static PyGetSetDef GPO_setters[] = {
  53         {discard_const_p(char, "ds_path"), (getter)GPO_get_ds_path, NULL, NULL,
  54                 NULL},
  55         {discard_const_p(char, "file_sys_path"), (getter)GPO_get_file_sys_path,
  56                 NULL, NULL, NULL},
  57         {discard_const_p(char, "display_name"), (getter)GPO_get_display_name, NULL,
  58                 NULL, NULL},
  59         {discard_const_p(char, "name"), (getter)GPO_get_name, NULL, NULL, NULL},
  60         {discard_const_p(char, "link"), (getter)GPO_get_link, NULL, NULL, NULL},
  61         {discard_const_p(char, "user_extensions"), (getter)GPO_get_user_extensions,
  62                 NULL, NULL, NULL},
  63         {discard_const_p(char, "machine_extensions"),
  64                 (getter)GPO_get_machine_extensions, NULL, NULL, NULL},
  65         {NULL}
  66 };
  67
  68 static PyObject *py_gpo_get_unix_path(PyObject *self, PyObject *args,
  69                                       PyObject *kwds)
  70 {
  71         NTSTATUS status;
  72         const char *cache_dir = NULL;
  73         PyObject *ret = Py_None;
  74         char *unix_path = NULL;
  75         TALLOC_CTX *frame = NULL;
  76         static const char *kwlist[] = {"cache_dir", NULL};
  77         struct GROUP_POLICY_OBJECT *gpo_ptr \
  78                 = (struct GROUP_POLICY_OBJECT *)pytalloc_get_ptr(self);
  79
  80         if (!PyArg_ParseTupleAndKeywords(args, kwds, "|s",
  81                                          discard_const_p(char *, kwlist),
  82                                          &cache_dir)) {
  83                 PyErr_SetString(PyExc_SystemError,
  84                                 "Failed to parse arguments to gpo_get_unix_path()");
  85                 goto out;
  86         }
  87
  88         if (!cache_dir) {
  89                 cache_dir = cache_path(GPO_CACHE_DIR);
  90                 if (!cache_dir) {
  91                         PyErr_SetString(PyExc_MemoryError,
  92                                         "Failed to determine gpo cache dir");
  93                         goto out;
  94                 }
  95         }
  96
  97         frame = talloc_stackframe();
  98
  99         status = gpo_get_unix_path(frame, cache_dir, gpo_ptr, &unix_path);
 100
 101         TALLOC_FREE(frame);
 102
 103         if (!NT_STATUS_IS_OK(status)) {
 104                 PyErr_SetString(PyExc_SystemError,
 105                                 "Failed to determine gpo unix path");
 106                 goto out;
 107         }
 108
 109         ret = PyString_FromString(unix_path);
 110
 111 out:
 112         return ret;
 113 }
 114
 115 static PyMethodDef GPO_methods[] = {
 116         {"get_unix_path", (PyCFunction)py_gpo_get_unix_path, METH_KEYWORDS, NULL },
 117         {NULL}
 118 };
 119
 120 static PyTypeObject GPOType = {
 121         PyVarObject_HEAD_INIT(NULL, 0)
 122         .tp_name = "gpo.GROUP_POLICY_OBJECT",
 123         .tp_doc = "GROUP_POLICY_OBJECT",
 124         .tp_getset = GPO_setters,
 125         .tp_methods = GPO_methods,
 126         .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
 127 };
 128
 129 typedef struct {
 130         PyObject_HEAD
 131         ADS_STRUCT *ads_ptr;
 132         struct cli_credentials *cli_creds;
 133 } ADS;
 134
 135 static void py_ads_dealloc(ADS* self)
 136 {
 137         ads_destroy(&(self->ads_ptr));
 138         Py_TYPE(self)->tp_free((PyObject*)self);
 139 }
 140
 141 static PyObject* py_ads_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 142 {
 143         ADS *self;
 144         self = (ADS*)type->tp_alloc(type, 0);
 145         return (PyObject*)self;
 146 }
 147
 148 static PyObject* py_ads_connect(ADS *self);
 149 static int py_ads_init(ADS *self, PyObject *args, PyObject *kwds)
 150 {
 151         const char *realm = NULL;
 152         const char *workgroup = NULL;
 153         const char *ldap_server = NULL;
 154         PyObject *py_creds = NULL;
 155         PyObject *lp_obj = NULL;
 156         struct loadparm_context *lp_ctx = NULL;
 157
 158         static const char *kwlist[] = {"ldap_server", "loadparm_context",
 159                 "credentials", NULL};
 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         if (py_creds) {
 166                 if (!py_check_dcerpc_type(py_creds, "samba.credentials",
 167                                           "Credentials")) {
 168                         PyErr_Format(PyExc_TypeError,
 169                                      "Expected samba.credentaials "
 170                                      "for credentials argument");
 171                         return -1;
 172                 }
 173                 self->cli_creds
 174                         = PyCredentials_AsCliCredentials(py_creds);
 175         }
 176
 177         if (lp_obj) {
 178                 bool ok;
 179                 lp_ctx = pytalloc_get_type(lp_obj, struct loadparm_context);
 180                 if (lp_ctx == NULL) {
 181                         return -1;
 182                 }
 183                 ok = lp_load_initial_only(lp_ctx->szConfigFile);
 184                 if (!ok) {
 185                         return -1;
 186                 }
 187         }
 188
 189         if (self->cli_creds) {
 190                 realm = cli_credentials_get_realm(self->cli_creds);
 191                 workgroup = cli_credentials_get_domain(self->cli_creds);
 192         } else {
 193                 realm = lp_realm();
 194                 workgroup = lp_workgroup();
 195                 if (!ldap_server) return -1;
 196         }
 197
 198         if ( !(self->ads_ptr = ads_init(realm, workgroup, ldap_server)) )
 199                 return -1;
 200
 201         return 0;
 202 }
 203
 204 static PyObject* py_ads_connect(ADS *self)
 205 {
 206         ADS_STATUS status;
 207         TALLOC_CTX *frame = talloc_stackframe();
 208         if (self->cli_creds) {
 209                 self->ads_ptr->auth.user_name =
 210                         SMB_STRDUP(cli_credentials_get_username(self->cli_creds));
 211                 self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 212                 self->ads_ptr->auth.password =
 213                         SMB_STRDUP(cli_credentials_get_password(self->cli_creds));
 214                 self->ads_ptr->auth.realm =
 215                         SMB_STRDUP(cli_credentials_get_realm(self->cli_creds));
 216
 217                 status = ads_connect_user_creds(self->ads_ptr);
 218                 if (!ADS_ERR_OK(status)) {
 219                         PyErr_SetString(PyExc_SystemError, "ads_connect() failed");
 220                         TALLOC_FREE(frame);
 221                         Py_RETURN_FALSE;
 222                 }
 223         } else {
 224                 char *passwd;
 225
 226                 if (asprintf(&(self->ads_ptr->auth.user_name), "%s$",
 227                              lp_netbios_name()) == -1) {
 228                         PyErr_SetString(PyExc_SystemError, "Failed to asprintf");
 229                         TALLOC_FREE(frame);
 230                         Py_RETURN_FALSE;
 231                 } else
 232                         self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 233                 if (!secrets_init()) {
 234                         PyErr_SetString(PyExc_SystemError, "secrets_init() failed");
 235                         TALLOC_FREE(frame);
 236                         Py_RETURN_FALSE;
 237                 }
 238                 if (!(passwd =
 239                       secrets_fetch_machine_password(self->ads_ptr->server.workgroup,
 240                                                      NULL, NULL))) {
 241                         PyErr_SetString(PyExc_SystemError,
 242                                         "Failed to fetch the machine account password");
 243                         TALLOC_FREE(frame);
 244                         Py_RETURN_FALSE;
 245                 }
 246                 self->ads_ptr->auth.password = smb_xstrdup(passwd);
 247                 self->ads_ptr->auth.realm = smb_xstrdup(self->ads_ptr->server.realm);
 248                 if (!strupper_m(self->ads_ptr->auth.realm)) {
 249                         PyErr_SetString(PyExc_SystemError, "Failed to strdup");
 250                         TALLOC_FREE(frame);
 251                         SAFE_FREE(passwd);
 252                         Py_RETURN_FALSE;
 253                 }
 254
 255                 status = ads_connect(self->ads_ptr);
 256                 if (!ADS_ERR_OK(status)) {
 257                         PyErr_SetString(PyExc_SystemError, "ads_connect() failed");
 258                         TALLOC_FREE(frame);
 259                         SAFE_FREE(passwd);
 260                         Py_RETURN_FALSE;
 261                 }
 262         }
 263
 264         TALLOC_FREE(frame);
 265         Py_RETURN_TRUE;
 266 }
 267
 268 /* Parameter mapping and functions for the GP_EXT struct */
 269 void initgpo(void);
 270
 271 /* Global methods aka do not need a special pyobject type */
 272 static PyObject *py_gpo_get_sysvol_gpt_version(PyObject * self,
 273                                                PyObject * args)
 274 {
 275         TALLOC_CTX *tmp_ctx = NULL;
 276         char *unix_path;
 277         char *display_name = NULL;
 278         uint32_t sysvol_version = 0;
 279         PyObject *result;
 280         NTSTATUS status;
 281
 282         tmp_ctx = talloc_new(NULL);
 283
 284         if (!PyArg_ParseTuple(args, "s", &unix_path)) {
 285                 return NULL;
 286         }
 287         status = gpo_get_sysvol_gpt_version(tmp_ctx, unix_path,
 288                                             &sysvol_version,
 289                                             &display_name);
 290         if (!NT_STATUS_IS_OK(status)) {
 291                 PyErr_SetNTSTATUS(status);
 292                 TALLOC_FREE(tmp_ctx);
 293                 return NULL;
 294         }
 295
 296         talloc_free(tmp_ctx);
 297         result = Py_BuildValue("[s,i]", display_name, sysvol_version);
 298         return result;
 299 }
 300
 301 static ADS_STATUS find_samaccount(ADS_STRUCT *ads, TALLOC_CTX *mem_ctx,
 302                                   const char *samaccountname,
 303                                   uint32_t *uac_ret, const char **dn_ret)
 304 {
 305         ADS_STATUS status;
 306         const char *attrs[] = { "userAccountControl", NULL };
 307         const char *filter;
 308         LDAPMessage *res = NULL;
 309         char *dn = NULL;
 310         uint32_t uac = 0;
 311
 312         filter = talloc_asprintf(mem_ctx, "(sAMAccountName=%s)", samaccountname);
 313         if (filter == NULL) {
 314                 status = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
 315                 goto out;
 316         }
 317
 318         status = ads_do_search_all(ads, ads->config.bind_path, LDAP_SCOPE_SUBTREE,
 319                                    filter, attrs, &res);
 320
 321         if (!ADS_ERR_OK(status)) {
 322                 goto out;
 323         }
 324
 325         if (ads_count_replies(ads, res) != 1) {
 326                 status = ADS_ERROR(LDAP_NO_RESULTS_RETURNED);
 327                 goto out;
 328         }
 329
 330         dn = ads_get_dn(ads, talloc_tos(), res);
 331         if (dn == NULL) {
 332                 status = ADS_ERROR(LDAP_NO_MEMORY);
 333                 goto out;
 334         }
 335
 336         if (!ads_pull_uint32(ads, res, "userAccountControl", &uac)) {
 337                 status = ADS_ERROR(LDAP_NO_SUCH_ATTRIBUTE);
 338                 goto out;
 339         }
 340
 341         if (uac_ret) {
 342                 *uac_ret = uac;
 343         }
 344
 345         if (dn_ret) {
 346                 *dn_ret = talloc_strdup(mem_ctx, dn);
 347                 if (!*dn_ret) {
 348                         status = ADS_ERROR(LDAP_NO_MEMORY);
 349                         goto out;
 350                 }
 351         }
 352 out:
 353         TALLOC_FREE(dn);
 354         ads_msgfree(ads, res);
 355
 356         return status;
 357 }
 358
 359 static PyObject *py_ads_get_gpo_list(ADS *self, PyObject *args, PyObject *kwds)
 360 {
 361         TALLOC_CTX *frame = NULL;
 362         struct GROUP_POLICY_OBJECT *gpo = NULL, *gpo_list = NULL;
 363         ADS_STATUS status;
 364         const char *samaccountname = NULL;
 365         const char *dn = NULL;
 366         uint32_t uac = 0;
 367         uint32_t flags = 0;
 368         struct security_token *token = NULL;
 369         PyObject *ret = Py_None;
 370         TALLOC_CTX *gpo_ctx;
 371         size_t list_size;
 372         size_t i;
 373
 374         static const char *kwlist[] = {"samaccountname", NULL};
 375         if (!PyArg_ParseTupleAndKeywords(args, kwds, "s",
 376                                          discard_const_p(char *, kwlist),
 377                                          &samaccountname)) {
 378                 PyErr_SetString(PyExc_SystemError,
 379                                 "Failed to parse arguments to py_ads_get_gpo_list()");
 380                 goto out;
 381         }
 382
 383         frame = talloc_stackframe();
 384
 385         status = find_samaccount(self->ads_ptr, frame, samaccountname, &uac, &dn);
 386         if (!ADS_ERR_OK(status)) {
 387                 TALLOC_FREE(frame);
 388                 PyErr_SetString(PyExc_SystemError, "Failed to find samAccountName");
 389                 goto out;
 390         }
 391
 392         if (uac & UF_WORKSTATION_TRUST_ACCOUNT || uac & UF_SERVER_TRUST_ACCOUNT) {
 393                 flags |= GPO_LIST_FLAG_MACHINE;
 394                 status = gp_get_machine_token(self->ads_ptr, frame, dn, &token);
 395         } else {
 396                 status = ads_get_sid_token(self->ads_ptr, frame, dn, &token);
 397         }
 398         if (!ADS_ERR_OK(status)) {
 399                 TALLOC_FREE(frame);
 400                 PyErr_SetString(PyExc_SystemError, "Failed to get token");
 401                 goto out;
 402         }
 403
 404         gpo_ctx = talloc_new(frame);
 405         status = ads_get_gpo_list(self->ads_ptr, gpo_ctx, dn, flags, token,
 406                                   &gpo_list);
 407         if (!ADS_ERR_OK(status)) {
 408                 TALLOC_FREE(frame);
 409                 PyErr_SetString(PyExc_SystemError, "Failed to fetch GPO list");
 410                 goto out;
 411         }
 412
 413         /* Convert the C linked list into a python list */
 414         list_size = 0;
 415         for (gpo = gpo_list; gpo != NULL; gpo = gpo->next) {
 416                 list_size++;
 417         }
 418
 419         i = 0;
 420         ret = PyList_New(list_size);
 421         if (ret == NULL) {
 422                 TALLOC_FREE(frame);
 423                 goto out;
 424         }
 425
 426         for (gpo = gpo_list; gpo != NULL; gpo = gpo->next) {
 427                 PyObject *obj = pytalloc_reference_ex(&GPOType,
 428                                                       gpo_ctx, gpo);
 429                 if (obj == NULL) {
 430                         TALLOC_FREE(frame);
 431                         goto out;
 432                 }
 433
 434                 PyList_SetItem(ret, i, obj);
 435                 i++;
 436         }
 437
 438 out:
 439
 440         TALLOC_FREE(frame);
 441         return ret;
 442 }
 443
 444 static PyMethodDef ADS_methods[] = {
 445         { "connect", (PyCFunction)py_ads_connect, METH_NOARGS,
 446                 "Connect to the LDAP server" },
 447         { "get_gpo_list", (PyCFunction)py_ads_get_gpo_list, METH_KEYWORDS, NULL },
 448         { NULL }
 449 };
 450
 451 static PyTypeObject ads_ADSType = {
 452         .tp_name = "gpo.ADS_STRUCT",
 453         .tp_basicsize = sizeof(ADS),
 454         .tp_dealloc = (destructor)py_ads_dealloc,
 455         .tp_flags = Py_TPFLAGS_DEFAULT,
 456         .tp_doc = "ADS struct",
 457         .tp_methods = ADS_methods,
 458         .tp_init = (initproc)py_ads_init,
 459         .tp_new = py_ads_new,
 460 };
 461
 462 static PyMethodDef py_gpo_methods[] = {
 463         {"gpo_get_sysvol_gpt_version", (PyCFunction) py_gpo_get_sysvol_gpt_version,
 464                 METH_VARARGS, NULL},
 465         {NULL}
 466 };
 467
 468 /* Will be called by python when loading this module */
 469 void initgpo(void)
 470 {
 471         PyObject *m;
 472
 473         debug_setup_talloc_log();
 474         /* Instantiate the types */
 475         m = Py_InitModule3("gpo", py_gpo_methods, "libgpo python bindings");
 476         if (m == NULL) return;
 477         PyModule_AddObject(m, "version",
 478                            PyString_FromString(SAMBA_VERSION_STRING));
 479
 480         if (PyType_Ready(&ads_ADSType) < 0)
 481                 return;
 482         PyModule_AddObject(m, "ADS_STRUCT", (PyObject *)&ads_ADSType);
 483
 484         if (pytalloc_BaseObject_PyType_Ready(&GPOType) < 0)
 485                 return;
 486
 487         Py_INCREF((PyObject *)(void *)&GPOType);
 488         PyModule_AddObject(m, "GROUP_POLICY_OBJECT",
 489                            (PyObject *)&GPOType);
 490
 491 }