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 typedef struct {
  34         PyObject_HEAD
  35         TALLOC_CTX *frame;
  36         struct GROUP_POLICY_OBJECT *gpo_ptr;
  37         struct GROUP_POLICY_OBJECT *head;
  38 } GPO;
  39
  40 static void py_gpo_dealloc(GPO* self)
  41 {
  42         talloc_free(self->frame);
  43         Py_TYPE(self)->tp_free((PyObject*)self);
  44 }
  45
  46 static PyObject* py_gpo_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
  47 {
  48         GPO *self;
  49         PyObject *c_obj;
  50         PyObject *talloc_obj;
  51         static const char *kwlist[] = {"gpo_ptr", "talloc_ctx", NULL};
  52         self = (GPO*)type->tp_alloc(type, 0);
  53         if (PyArg_ParseTupleAndKeywords(args, kwds, "|OO", discard_const_p(char *, kwlist),
  54                                         &c_obj, &talloc_obj)) {
  55                 self->gpo_ptr = PyCapsule_GetPointer(c_obj, NULL);
  56                 self->head = self->gpo_ptr;
  57                 self->frame = PyCapsule_GetPointer(talloc_obj, NULL);
  58         } else
  59                 self->gpo_ptr = NULL;
  60                 self->frame = NULL;
  61         return (PyObject*)self;
  62 }
  63
  64 static int py_gpo_init(GPO *self, PyObject *args, PyObject *kwds)
  65 {
  66         return 0;
  67 }
  68
  69 #define GPO_getter(ATTR) \
  70 static PyObject* GPO_get_##ATTR(GPO *self, void *closure) \
  71 { \
  72         if (self->gpo_ptr->ATTR) \
  73                 return PyString_FromString(self->gpo_ptr->ATTR); \
  74         else \
  75                 return Py_None; \
  76 }
  77 GPO_getter(ds_path)
  78 GPO_getter(file_sys_path)
  79 GPO_getter(display_name)
  80 GPO_getter(name)
  81 GPO_getter(link)
  82 GPO_getter(user_extensions)
  83 GPO_getter(machine_extensions)
  84
  85 static PyGetSetDef GPO_setters[] = {
  86         {discard_const_p(char, "ds_path"), (getter)GPO_get_ds_path, NULL, NULL, NULL},
  87         {discard_const_p(char, "file_sys_path"), (getter)GPO_get_file_sys_path, NULL, NULL, NULL},
  88         {discard_const_p(char, "display_name"), (getter)GPO_get_display_name, NULL, NULL, NULL},
  89         {discard_const_p(char, "name"), (getter)GPO_get_name, NULL, NULL, NULL},
  90         {discard_const_p(char, "link"), (getter)GPO_get_link, NULL, NULL, NULL},
  91         {discard_const_p(char, "user_extensions"), (getter)GPO_get_user_extensions, NULL, NULL, NULL},
  92         {discard_const_p(char, "machine_extensions"), (getter)GPO_get_machine_extensions, NULL, NULL, NULL},
  93         {NULL}
  94 };
  95
  96 static PyObject *py_gpo_get_unix_path(GPO *self, PyObject *args, PyObject *kwds)
  97 {
  98         NTSTATUS status;
  99         const char *cache_dir = NULL;
 100         PyObject *ret = Py_None;
 101         char *unix_path = NULL;
 102
 103         static const char *kwlist[] = {"cache_dir", NULL};
 104         if (!PyArg_ParseTupleAndKeywords(args, kwds, "|s", discard_const_p(char *, kwlist), &cache_dir)) {
 105                 PyErr_SetString(PyExc_SystemError, "Failed to parse arguments to gpo_get_unix_path()");
 106                 goto out;
 107         }
 108
 109         if (!cache_dir) {
 110                 cache_dir = cache_path(GPO_CACHE_DIR);
 111                 if (!cache_dir) {
 112                         PyErr_SetString(PyExc_MemoryError, "Failed to determine gpo cache dir");
 113                         goto out;
 114                 }
 115         }
 116
 117         status = gpo_get_unix_path(self->frame, cache_dir, self->gpo_ptr, &unix_path);
 118         if (!NT_STATUS_IS_OK(status)) {
 119                 PyErr_SetString(PyExc_SystemError, "Failed to determine gpo unix path");
 120                 goto out;
 121         }
 122
 123         ret = PyString_FromString(unix_path);
 124
 125 out:
 126         return ret;
 127 }
 128
 129 static PyMethodDef GPO_methods[] = {
 130         {"get_unix_path", (PyCFunction)py_gpo_get_unix_path, METH_KEYWORDS, NULL },
 131         {NULL}
 132 };
 133
 134 static PyTypeObject GPOType;
 135 static PyObject* py_gpo_iternext(GPO *self)
 136 {
 137         if (self->gpo_ptr && self->gpo_ptr->next) {
 138                 self->gpo_ptr = self->gpo_ptr->next;
 139                 return (PyObject *)self;
 140         } else {
 141                 self->gpo_ptr = self->head;
 142                 PyErr_SetNone(PyExc_StopIteration);
 143                 return NULL;
 144         }
 145 }
 146
 147 static PyObject* py_gpo_iter(PyObject *self)
 148 {
 149         Py_INCREF(self);
 150         return self;
 151 }
 152
 153 static PyTypeObject GPOType = {
 154         .tp_name = "gpo.GROUP_POLICY_OBJECT",
 155         .tp_basicsize = sizeof(GPO),
 156         .tp_new = py_gpo_new,
 157         .tp_free = PyObject_Del,
 158         .tp_init = (initproc)py_gpo_init,
 159         .tp_alloc = PyType_GenericAlloc,
 160         .tp_dealloc = (destructor)py_gpo_dealloc,
 161         .tp_doc = "GROUP_POLICY_OBJECT",
 162         .tp_getset = GPO_setters,
 163         .tp_methods = GPO_methods,
 164         .tp_iter = py_gpo_iter,
 165         .tp_iternext = (iternextfunc)py_gpo_iternext,
 166         .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_ITER,
 167 };
 168
 169 typedef struct {
 170         PyObject_HEAD
 171         TALLOC_CTX *frame;
 172         ADS_STRUCT *ads_ptr;
 173         struct cli_credentials *cli_creds;
 174 } ADS;
 175
 176 static void py_ads_dealloc(ADS* self)
 177 {
 178         ads_destroy(&(self->ads_ptr));
 179         talloc_free(self->frame);
 180         Py_TYPE(self)->tp_free((PyObject*)self);
 181 }
 182
 183 static PyObject* py_ads_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 184 {
 185         ADS *self;
 186         self = (ADS*)type->tp_alloc(type, 0);
 187         return (PyObject*)self;
 188 }
 189
 190 static PyObject* py_ads_connect(ADS *self);
 191 static int py_ads_init(ADS *self, PyObject *args, PyObject *kwds)
 192 {
 193         const char *realm = NULL;
 194         const char *workgroup = NULL;
 195         const char *ldap_server = NULL;
 196         PyObject *py_creds = NULL;
 197         PyObject *lp_obj = NULL;
 198         struct loadparm_context *lp_ctx = NULL;
 199
 200         static const char *kwlist[] = {"ldap_server", "loadparm_context", "credentials", NULL};
 201         if (!PyArg_ParseTupleAndKeywords(args, kwds, "sO|O", discard_const_p(char *, kwlist), &ldap_server, &lp_obj, &py_creds))
 202                 return -1;
 203
 204         self->frame = talloc_stackframe();
 205
 206         if (py_creds) {
 207                 if (!py_check_dcerpc_type(py_creds, "samba.credentials",
 208                                           "Credentials")) {
 209                         PyErr_Format(PyExc_TypeError,
 210                                      "Expected samba.credentaials "
 211                                      "for credentials argument");
 212                         return -1;
 213                 }
 214                 self->cli_creds
 215                         = PyCredentials_AsCliCredentials(py_creds);
 216         }
 217
 218         if (lp_obj) {
 219                 lp_ctx = pytalloc_get_type(lp_obj, struct loadparm_context);
 220                 if (lp_ctx == NULL) {
 221                         return -1;
 222                 }
 223         }
 224         if (!lp_load_initial_only(lp_ctx->szConfigFile)) return -1;
 225
 226         if (self->cli_creds) {
 227                 realm = cli_credentials_get_realm(self->cli_creds);
 228                 workgroup = cli_credentials_get_domain(self->cli_creds);
 229         } else {
 230                 realm = lp_realm();
 231                 workgroup = lp_workgroup();
 232                 if (!ldap_server) return -1;
 233         }
 234
 235         if ( !(self->ads_ptr = ads_init(realm, workgroup, ldap_server)) )
 236                 return -1;
 237
 238         return 0;
 239 }
 240
 241 static PyObject* py_ads_connect(ADS *self)
 242 {
 243         ADS_STATUS status;
 244         TALLOC_CTX *frame = talloc_stackframe();
 245         if (self->cli_creds) {
 246                 self->ads_ptr->auth.user_name = SMB_STRDUP(cli_credentials_get_username(self->cli_creds));
 247 self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 248                 self->ads_ptr->auth.password = SMB_STRDUP(cli_credentials_get_password(self->cli_creds));
 249                 self->ads_ptr->auth.realm = SMB_STRDUP(cli_credentials_get_realm(self->cli_creds));
 250
 251                 status = ads_connect_user_creds(self->ads_ptr);
 252                 if (!ADS_ERR_OK(status)) {
 253                         PyErr_SetString(PyExc_SystemError, "ads_connect() failed");
 254                         TALLOC_FREE(frame);
 255                         Py_RETURN_FALSE;
 256                 }
 257         } else {
 258                 char *passwd;
 259
 260                 if (asprintf(&(self->ads_ptr->auth.user_name), "%s$", lp_netbios_name()) == -1) {
 261                         PyErr_SetString(PyExc_SystemError, "Failed to asprintf");
 262                         TALLOC_FREE(frame);
 263                         Py_RETURN_FALSE;
 264                 } else
 265                         self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 266                 if (!secrets_init()) {
 267                         PyErr_SetString(PyExc_SystemError, "secrets_init() failed");
 268                         TALLOC_FREE(frame);
 269                         Py_RETURN_FALSE;
 270                 }
 271
 272                 if (!(passwd = secrets_fetch_machine_password(self->ads_ptr->server.workgroup, NULL, NULL))) {
 273                         PyErr_SetString(PyExc_SystemError, "Failed to fetch the machine account password");
 274                         TALLOC_FREE(frame);
 275                         Py_RETURN_FALSE;
 276                 }
 277                 self->ads_ptr->auth.password = smb_xstrdup(passwd);
 278                 self->ads_ptr->auth.realm = smb_xstrdup(self->ads_ptr->server.realm);
 279                 if (!strupper_m(self->ads_ptr->auth.realm)) {
 280                         PyErr_SetString(PyExc_SystemError, "Failed to strdup");
 281                         TALLOC_FREE(frame);
 282                         Py_RETURN_FALSE;
 283                 }
 284
 285                 status = ads_connect(self->ads_ptr);
 286                 if (!ADS_ERR_OK(status)) {
 287                         PyErr_SetString(PyExc_SystemError, "ads_connect() failed");
 288                         TALLOC_FREE(frame);
 289                         Py_RETURN_FALSE;
 290                 }
 291         }
 292
 293         TALLOC_FREE(frame);
 294         Py_RETURN_TRUE;
 295 }
 296
 297 /* Parameter mapping and functions for the GP_EXT struct */
 298 void initgpo(void);
 299
 300 /* Global methods aka do not need a special pyobject type */
 301 static PyObject *py_gpo_get_sysvol_gpt_version(PyObject * self, 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 static ADS_STATUS find_samaccount(ADS_STRUCT *ads, TALLOC_CTX *mem_ctx, const char *samaccountname, uint32_t *uac_ret, const char **dn_ret)
 330 {
 331         ADS_STATUS status;
 332         const char *attrs[] = { "userAccountControl", NULL };
 333         const char *filter;
 334         LDAPMessage *res = NULL;
 335         char *dn = NULL;
 336         uint32_t uac = 0;
 337
 338         filter = talloc_asprintf(mem_ctx, "(sAMAccountName=%s)", samaccountname);
 339         if (filter == NULL) {
 340                 status = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
 341                 goto out;
 342         }
 343
 344         status = ads_do_search_all(ads, ads->config.bind_path, LDAP_SCOPE_SUBTREE, filter, attrs, &res);
 345
 346         if (!ADS_ERR_OK(status)) {
 347                 goto out;
 348         }
 349
 350         if (ads_count_replies(ads, res) != 1) {
 351                 status = ADS_ERROR(LDAP_NO_RESULTS_RETURNED);
 352                 goto out;
 353         }
 354
 355         dn = ads_get_dn(ads, talloc_tos(), res);
 356         if (dn == NULL) {
 357                 status = ADS_ERROR(LDAP_NO_MEMORY);
 358                 goto out;
 359         }
 360
 361         if (!ads_pull_uint32(ads, res, "userAccountControl", &uac)) {
 362                 status = ADS_ERROR(LDAP_NO_SUCH_ATTRIBUTE);
 363                 goto out;
 364         }
 365
 366         if (uac_ret) {
 367                 *uac_ret = uac;
 368         }
 369
 370         if (dn_ret) {
 371                 *dn_ret = talloc_strdup(mem_ctx, dn);
 372                 if (!*dn_ret) {
 373                         status = ADS_ERROR(LDAP_NO_MEMORY);
 374                         goto out;
 375                 }
 376         }
 377 out:
 378         TALLOC_FREE(dn);
 379         ads_msgfree(ads, res);
 380
 381         return status;
 382 }
 383
 384 static PyObject *py_ads_get_gpo_list(ADS *self, PyObject *args, PyObject *kwds)
 385 {
 386         TALLOC_CTX *mem_ctx = NULL;
 387         struct GROUP_POLICY_OBJECT *gpo_list = NULL;
 388         ADS_STATUS status;
 389         const char *samaccountname = NULL;
 390         const char *dn = NULL;
 391         uint32_t uac = 0;
 392         uint32_t flags = 0;
 393         struct security_token *token = NULL;
 394         PyObject *ret = Py_None;
 395         TALLOC_CTX *gpo_ctx;
 396         PyObject * t_args;
 397
 398         static const char *kwlist[] = {"samaccountname", NULL};
 399         if (!PyArg_ParseTupleAndKeywords(args, kwds, "s", discard_const_p(char *, kwlist), &samaccountname)) {
 400                 PyErr_SetString(PyExc_SystemError, "Failed to parse arguments to py_ads_get_gpo_list()");
 401                 goto out;
 402         }
 403
 404         mem_ctx = talloc_new(self->frame);
 405
 406         status = find_samaccount(self->ads_ptr, mem_ctx, samaccountname, &uac, &dn);
 407         if (!ADS_ERR_OK(status)) {
 408                 PyErr_SetString(PyExc_SystemError, "Failed to find samAccountName");
 409                 goto out;
 410         }
 411
 412         if (uac & UF_WORKSTATION_TRUST_ACCOUNT || uac & UF_SERVER_TRUST_ACCOUNT) {
 413                 flags |= GPO_LIST_FLAG_MACHINE;
 414                 status = gp_get_machine_token(self->ads_ptr, mem_ctx, dn, &token);
 415         } else {
 416                 status = ads_get_sid_token(self->ads_ptr, mem_ctx, dn, &token);
 417         }
 418         if (!ADS_ERR_OK(status)) {
 419                 PyErr_SetString(PyExc_SystemError, "Failed to get token");
 420                 goto out;
 421         }
 422
 423         gpo_ctx = talloc_new(NULL);
 424         status = ads_get_gpo_list(self->ads_ptr, gpo_ctx, dn, flags, token, &gpo_list);
 425         if (!ADS_ERR_OK(status)) {
 426                 PyErr_SetString(PyExc_SystemError, "Failed to fetch GPO list");
 427                 goto out;
 428         }
 429
 430         t_args = PyTuple_New(2);
 431         PyTuple_SetItem(t_args, 0, PyCapsule_New(gpo_list, NULL, NULL));
 432         PyTuple_SetItem(t_args, 1, PyCapsule_New(gpo_ctx, NULL, NULL));
 433         ret = PyObject_CallObject((PyObject *)&GPOType, t_args);
 434
 435 out:
 436         talloc_free(mem_ctx);
 437         if (!ret) {
 438                 PyErr_Print();
 439                 return Py_None;
 440         }
 441         return ret;
 442 }
 443
 444 static PyMethodDef ADS_methods[] = {
 445         { "connect", (PyCFunction)py_ads_connect, METH_NOARGS, "Connect to the LDAP server" },
 446         { "get_gpo_list", (PyCFunction)py_ads_get_gpo_list, METH_KEYWORDS, NULL },
 447         { NULL }
 448 };
 449
 450 static PyTypeObject ads_ADSType = {
 451         .tp_name = "gpo.ADS_STRUCT",
 452         .tp_basicsize = sizeof(ADS),
 453         .tp_dealloc = (destructor)py_ads_dealloc,
 454         .tp_flags = Py_TPFLAGS_DEFAULT,
 455         .tp_doc = "ADS struct",
 456         .tp_methods = ADS_methods,
 457         .tp_init = (initproc)py_ads_init,
 458         .tp_new = py_ads_new,
 459 };
 460
 461 static PyMethodDef py_gpo_methods[] = {
 462         {"gpo_get_sysvol_gpt_version", (PyCFunction) py_gpo_get_sysvol_gpt_version, METH_VARARGS, NULL},
 463         {NULL}
 464 };
 465
 466 /* Will be called by python when loading this module */
 467 void initgpo(void)
 468 {
 469         PyObject *m;
 470
 471         debug_setup_talloc_log();
 472         /* Instantiate the types */
 473         m = Py_InitModule3("gpo", py_gpo_methods, "libgpo python bindings");
 474         if (m == NULL) return;
 475         PyModule_AddObject(m, "version", PyString_FromString(SAMBA_VERSION_STRING));
 476         if (PyType_Ready(&ads_ADSType) < 0)
 477                 return;
 478         PyModule_AddObject(m, "ADS_STRUCT", (PyObject *)&ads_ADSType);
 479         if (PyType_Ready(&GPOType) < 0)
 480                 return;
 481         PyModule_AddObject(m, "GROUP_POLICY_OBJECT", (PyObject *)&GPOType);
 482 }