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 "auth/credentials/pycredentials.h"
  28
  29 /* A Python C API module to use LIBGPO */
  30
  31 #ifndef Py_RETURN_NONE
  32 #define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
  33 #endif
  34
  35 typedef struct {
  36         PyObject_HEAD
  37         TALLOC_CTX *frame;
  38         struct GROUP_POLICY_OBJECT *gpo_ptr;
  39         struct GROUP_POLICY_OBJECT *head;
  40 } GPO;
  41
  42 static void py_gpo_dealloc(GPO* self)
  43 {
  44         talloc_free(self->frame);
  45         Py_TYPE(self)->tp_free((PyObject*)self);
  46 }
  47
  48 static PyObject* py_gpo_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
  49 {
  50         GPO *self;
  51         PyObject *c_obj;
  52         PyObject *talloc_obj;
  53         static const char *kwlist[] = {"gpo_ptr", "talloc_ctx", NULL};
  54         self = (GPO*)type->tp_alloc(type, 0);
  55         if (PyArg_ParseTupleAndKeywords(args, kwds, "|OO", discard_const_p(char *, kwlist),
  56                                         &c_obj, &talloc_obj)) {
  57                 self->gpo_ptr = PyCapsule_GetPointer(c_obj, NULL);
  58                 self->head = self->gpo_ptr;
  59                 self->frame = PyCapsule_GetPointer(talloc_obj, NULL);
  60         } else
  61                 self->gpo_ptr = NULL;
  62                 self->frame = NULL;
  63         return (PyObject*)self;
  64 }
  65
  66 static int py_gpo_init(GPO *self, PyObject *args, PyObject *kwds)
  67 {
  68         return 0;
  69 }
  70
  71 #define GPO_getter(ATTR) \
  72 static PyObject* GPO_get_##ATTR(GPO *self, void *closure) \
  73 { \
  74         if (self->gpo_ptr->ATTR) \
  75                 return PyString_FromString(self->gpo_ptr->ATTR); \
  76         else \
  77                 return Py_None; \
  78 }
  79 GPO_getter(ds_path)
  80 GPO_getter(file_sys_path)
  81 GPO_getter(display_name)
  82 GPO_getter(name)
  83 GPO_getter(link)
  84 GPO_getter(user_extensions)
  85 GPO_getter(machine_extensions)
  86
  87 static PyGetSetDef GPO_setters[] = {
  88         {discard_const_p(char, "ds_path"), (getter)GPO_get_ds_path, NULL, NULL, NULL},
  89         {discard_const_p(char, "file_sys_path"), (getter)GPO_get_file_sys_path, NULL, NULL, NULL},
  90         {discard_const_p(char, "display_name"), (getter)GPO_get_display_name, NULL, NULL, NULL},
  91         {discard_const_p(char, "name"), (getter)GPO_get_name, NULL, NULL, NULL},
  92         {discard_const_p(char, "link"), (getter)GPO_get_link, NULL, NULL, NULL},
  93         {discard_const_p(char, "user_extensions"), (getter)GPO_get_user_extensions, NULL, NULL, NULL},
  94         {discard_const_p(char, "machine_extensions"), (getter)GPO_get_machine_extensions, NULL, NULL, NULL},
  95         {NULL}
  96 };
  97
  98 static PyObject *py_gpo_get_unix_path(GPO *self, PyObject *args, PyObject *kwds)
  99 {
 100         NTSTATUS status;
 101         const char *cache_dir = NULL;
 102         PyObject *ret = Py_None;
 103         char *unix_path = NULL;
 104
 105         static const char *kwlist[] = {"cache_dir", NULL};
 106         if (!PyArg_ParseTupleAndKeywords(args, kwds, "|s", discard_const_p(char *, kwlist), &cache_dir)) {
 107                 PyErr_SetString(PyExc_SystemError, "Failed to parse arguments to gpo_get_unix_path()");
 108                 goto out;
 109         }
 110
 111         if (!cache_dir) {
 112                 cache_dir = cache_path(GPO_CACHE_DIR);
 113                 if (!cache_dir) {
 114                         PyErr_SetString(PyExc_MemoryError, "Failed to determine gpo cache dir");
 115                         goto out;
 116                 }
 117         }
 118
 119         status = gpo_get_unix_path(self->frame, cache_dir, self->gpo_ptr, &unix_path);
 120         if (!NT_STATUS_IS_OK(status)) {
 121                 PyErr_SetString(PyExc_SystemError, "Failed to determine gpo unix path");
 122                 goto out;
 123         }
 124
 125         ret = PyString_FromString(unix_path);
 126
 127 out:
 128         return ret;
 129 }
 130
 131 static PyMethodDef GPO_methods[] = {
 132         {"get_unix_path", (PyCFunction)py_gpo_get_unix_path, METH_KEYWORDS, NULL },
 133         {NULL}
 134 };
 135
 136 static PyTypeObject GPOType;
 137 static PyObject* py_gpo_iternext(GPO *self)
 138 {
 139         if (self->gpo_ptr && self->gpo_ptr->next) {
 140                 self->gpo_ptr = self->gpo_ptr->next;
 141                 return (PyObject *)self;
 142         } else {
 143                 self->gpo_ptr = self->head;
 144                 PyErr_SetNone(PyExc_StopIteration);
 145                 return NULL;
 146         }
 147 }
 148
 149 static PyObject* py_gpo_iter(PyObject *self)
 150 {
 151         Py_INCREF(self);
 152         return self;
 153 }
 154
 155 static PyTypeObject GPOType = {
 156         .tp_name = "gpo.GROUP_POLICY_OBJECT",
 157         .tp_basicsize = sizeof(GPO),
 158         .tp_new = py_gpo_new,
 159         .tp_free = PyObject_Del,
 160         .tp_init = (initproc)py_gpo_init,
 161         .tp_alloc = PyType_GenericAlloc,
 162         .tp_dealloc = (destructor)py_gpo_dealloc,
 163         .tp_doc = "GROUP_POLICY_OBJECT",
 164         .tp_getset = GPO_setters,
 165         .tp_methods = GPO_methods,
 166         .tp_iter = py_gpo_iter,
 167         .tp_iternext = (iternextfunc)py_gpo_iternext,
 168         .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_ITER,
 169 };
 170
 171 typedef struct {
 172         PyObject_HEAD
 173         TALLOC_CTX *frame;
 174         ADS_STRUCT *ads_ptr;
 175         struct cli_credentials *cli_creds;
 176 } ADS;
 177
 178 static void py_ads_dealloc(ADS* self)
 179 {
 180         ads_destroy(&(self->ads_ptr));
 181         talloc_free(self->frame);
 182         Py_TYPE(self)->tp_free((PyObject*)self);
 183 }
 184
 185 static PyObject* py_ads_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 186 {
 187         ADS *self;
 188         self = (ADS*)type->tp_alloc(type, 0);
 189         return (PyObject*)self;
 190 }
 191
 192 static PyObject* py_ads_connect(ADS *self);
 193 static int py_ads_init(ADS *self, PyObject *args, PyObject *kwds)
 194 {
 195         const char *realm = NULL;
 196         const char *workgroup = NULL;
 197         const char *ldap_server = NULL;
 198         PyObject *creds = NULL;
 199         PyObject *lp_obj = NULL;
 200         struct loadparm_context *lp_ctx = NULL;
 201
 202         static const char *kwlist[] = {"ldap_server", "loadparm_context", "credentials", NULL};
 203         if (!PyArg_ParseTupleAndKeywords(args, kwds, "sO|O", discard_const_p(char *, kwlist), &ldap_server, &lp_obj, &creds))
 204                 return -1;
 205
 206         self->frame = talloc_stackframe();
 207
 208         if (creds) self->cli_creds = pytalloc_get_type(creds, struct cli_credentials);
 209
 210         if (lp_obj) {
 211                 lp_ctx = pytalloc_get_type(lp_obj, struct loadparm_context);
 212                 if (lp_ctx == NULL) {
 213                         return -1;
 214                 }
 215         }
 216         if (!lp_load_initial_only(lp_ctx->szConfigFile)) return -1;
 217
 218         if (self->cli_creds) {
 219                 realm = cli_credentials_get_realm(self->cli_creds);
 220                 workgroup = cli_credentials_get_domain(self->cli_creds);
 221         } else {
 222                 realm = lp_realm();
 223                 workgroup = lp_workgroup();
 224                 if (!ldap_server) return -1;
 225         }
 226
 227         if ( !(self->ads_ptr = ads_init(realm, workgroup, ldap_server)) )
 228                 return -1;
 229
 230         return 0;
 231 }
 232
 233 static PyObject* py_ads_connect(ADS *self)
 234 {
 235         ADS_STATUS status;
 236         if (self->cli_creds) {
 237                 self->ads_ptr->auth.user_name = SMB_STRDUP(cli_credentials_get_username(self->cli_creds));
 238 self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 239                 self->ads_ptr->auth.password = SMB_STRDUP(cli_credentials_get_password(self->cli_creds));
 240                 self->ads_ptr->auth.realm = SMB_STRDUP(cli_credentials_get_realm(self->cli_creds));
 241
 242                 status = ads_connect_user_creds(self->ads_ptr);
 243                 if (!ADS_ERR_OK(status)) {
 244                         PyErr_SetString(PyExc_SystemError, "ads_connect() failed");
 245                         Py_RETURN_FALSE;
 246                 }
 247         } else {
 248                 char *passwd;
 249
 250                 if (asprintf(&(self->ads_ptr->auth.user_name), "%s$", lp_netbios_name()) == -1) {
 251                         PyErr_SetString(PyExc_SystemError, "Failed to asprintf");
 252                         Py_RETURN_FALSE;
 253                 } else
 254                         self->ads_ptr->auth.flags |= ADS_AUTH_USER_CREDS;
 255                 if (!secrets_init()) {
 256                         PyErr_SetString(PyExc_SystemError, "secrets_init() failed");
 257                         Py_RETURN_FALSE;
 258                 }
 259                 if (!(passwd = secrets_fetch_machine_password(self->ads_ptr->server.workgroup, NULL, NULL))) {
 260                         PyErr_SetString(PyExc_SystemError, "Failed to fetch the machine account password");
 261                         Py_RETURN_FALSE;
 262                 }
 263                 self->ads_ptr->auth.password = smb_xstrdup(passwd);
 264                 self->ads_ptr->auth.realm = smb_xstrdup(self->ads_ptr->server.realm);
 265                 if (!strupper_m(self->ads_ptr->auth.realm)) {
 266                         PyErr_SetString(PyExc_SystemError, "Failed to strdup");
 267                         Py_RETURN_FALSE;
 268                 }
 269
 270                 status = ads_connect(self->ads_ptr);
 271                 if (!ADS_ERR_OK(status)) {
 272                         PyErr_SetString(PyExc_SystemError, "ads_connect() failed");
 273                         Py_RETURN_FALSE;
 274                 }
 275         }
 276
 277         Py_RETURN_TRUE;
 278 }
 279
 280 /* Parameter mapping and functions for the GP_EXT struct */
 281 void initgpo(void);
 282
 283 /* Global methods aka do not need a special pyobject type */
 284 static PyObject *py_gpo_get_sysvol_gpt_version(PyObject * self, PyObject * args)
 285 {
 286         TALLOC_CTX *tmp_ctx = NULL;
 287         char *unix_path;
 288         char *display_name = NULL;
 289         uint32_t sysvol_version = 0;
 290         PyObject *result;
 291
 292         tmp_ctx = talloc_new(NULL);
 293
 294         if (!PyArg_ParseTuple(args, "s", &unix_path)) {
 295                 return NULL;
 296         }
 297         gpo_get_sysvol_gpt_version(tmp_ctx, unix_path, &sysvol_version, &display_name);
 298         talloc_free(tmp_ctx);
 299         result = Py_BuildValue("[s,i]", display_name, sysvol_version);
 300         return result;
 301 }
 302
 303 static ADS_STATUS find_samaccount(ADS_STRUCT *ads, TALLOC_CTX *mem_ctx, const char *samaccountname, 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, filter, attrs, &res);
 319
 320         if (!ADS_ERR_OK(status)) {
 321                 goto out;
 322         }
 323
 324         if (ads_count_replies(ads, res) != 1) {
 325                 status = ADS_ERROR(LDAP_NO_RESULTS_RETURNED);
 326                 goto out;
 327         }
 328
 329         dn = ads_get_dn(ads, talloc_tos(), res);
 330         if (dn == NULL) {
 331                 status = ADS_ERROR(LDAP_NO_MEMORY);
 332                 goto out;
 333         }
 334
 335         if (!ads_pull_uint32(ads, res, "userAccountControl", &uac)) {
 336                 status = ADS_ERROR(LDAP_NO_SUCH_ATTRIBUTE);
 337                 goto out;
 338         }
 339
 340         if (uac_ret) {
 341                 *uac_ret = uac;
 342         }
 343
 344         if (dn_ret) {
 345                 *dn_ret = talloc_strdup(mem_ctx, dn);
 346                 if (!*dn_ret) {
 347                         status = ADS_ERROR(LDAP_NO_MEMORY);
 348                         goto out;
 349                 }
 350         }
 351 out:
 352         TALLOC_FREE(dn);
 353         ads_msgfree(ads, res);
 354
 355         return status;
 356 }
 357
 358 static PyObject *py_ads_get_gpo_list(ADS *self, PyObject *args, PyObject *kwds)
 359 {
 360         TALLOC_CTX *mem_ctx = NULL;
 361         struct GROUP_POLICY_OBJECT *gpo_list = NULL;
 362         ADS_STATUS status;
 363         const char *samaccountname = NULL;
 364         const char *dn = NULL;
 365         uint32_t uac = 0;
 366         uint32_t flags = 0;
 367         struct security_token *token = NULL;
 368         PyObject *ret = Py_None;
 369         TALLOC_CTX *gpo_ctx;
 370         PyObject * t_args;
 371
 372         static const char *kwlist[] = {"samaccountname", NULL};
 373         if (!PyArg_ParseTupleAndKeywords(args, kwds, "s", discard_const_p(char *, kwlist), &samaccountname)) {
 374                 PyErr_SetString(PyExc_SystemError, "Failed to parse arguments to py_ads_get_gpo_list()");
 375                 goto out;
 376         }
 377
 378         mem_ctx = talloc_new(self->frame);
 379
 380         status = find_samaccount(self->ads_ptr, mem_ctx, samaccountname, &uac, &dn);
 381         if (!ADS_ERR_OK(status)) {
 382                 PyErr_SetString(PyExc_SystemError, "Failed to find samAccountName");
 383                 goto out;
 384         }
 385
 386         if (uac & UF_WORKSTATION_TRUST_ACCOUNT || uac & UF_SERVER_TRUST_ACCOUNT) {
 387                 flags |= GPO_LIST_FLAG_MACHINE;
 388                 status = gp_get_machine_token(self->ads_ptr, mem_ctx, dn, &token);
 389         } else {
 390                 status = ads_get_sid_token(self->ads_ptr, mem_ctx, dn, &token);
 391         }
 392         if (!ADS_ERR_OK(status)) {
 393                 PyErr_SetString(PyExc_SystemError, "Failed to get token");
 394                 goto out;
 395         }
 396
 397         gpo_ctx = talloc_new(NULL);
 398         status = ads_get_gpo_list(self->ads_ptr, gpo_ctx, dn, flags, token, &gpo_list);
 399         if (!ADS_ERR_OK(status)) {
 400                 PyErr_SetString(PyExc_SystemError, "Failed to fetch GPO list");
 401                 goto out;
 402         }
 403
 404         t_args = PyTuple_New(2);
 405         PyTuple_SetItem(t_args, 0, PyCapsule_New(gpo_list, NULL, NULL));
 406         PyTuple_SetItem(t_args, 1, PyCapsule_New(gpo_ctx, NULL, NULL));
 407         ret = PyObject_CallObject((PyObject *)&GPOType, t_args);
 408
 409 out:
 410         talloc_free(mem_ctx);
 411         if (!ret) {
 412                 PyErr_Print();
 413                 return Py_None;
 414         }
 415         return ret;
 416 }
 417
 418 static PyMethodDef ADS_methods[] = {
 419         { "connect", (PyCFunction)py_ads_connect, METH_NOARGS, "Connect to the LDAP server" },
 420         { "get_gpo_list", (PyCFunction)py_ads_get_gpo_list, METH_KEYWORDS, NULL },
 421         { NULL }
 422 };
 423
 424 static PyTypeObject ads_ADSType = {
 425         .tp_name = "gpo.ADS_STRUCT",
 426         .tp_basicsize = sizeof(ADS),
 427         .tp_dealloc = (destructor)py_ads_dealloc,
 428         .tp_flags = Py_TPFLAGS_DEFAULT,
 429         .tp_doc = "ADS struct",
 430         .tp_methods = ADS_methods,
 431         .tp_init = (initproc)py_ads_init,
 432         .tp_new = py_ads_new,
 433 };
 434
 435 static PyMethodDef py_gpo_methods[] = {
 436         {"gpo_get_sysvol_gpt_version", (PyCFunction) py_gpo_get_sysvol_gpt_version, METH_VARARGS, NULL},
 437         {NULL}
 438 };
 439
 440 /* Will be called by python when loading this module */
 441 void initgpo(void)
 442 {
 443         PyObject *m;
 444
 445         debug_setup_talloc_log();
 446         /* Instantiate the types */
 447         m = Py_InitModule3("gpo", py_gpo_methods, "libgpo python bindings");
 448         if (m == NULL) return;
 449         PyModule_AddObject(m, "version", PyString_FromString(SAMBA_VERSION_STRING));
 450         if (PyType_Ready(&ads_ADSType) < 0)
 451                 return;
 452         PyModule_AddObject(m, "ADS_STRUCT", (PyObject *)&ads_ADSType);
 453         if (PyType_Ready(&GPOType) < 0)
 454                 return;
 455         PyModule_AddObject(m, "GROUP_POLICY_OBJECT", (PyObject *)&GPOType);
 456 }