source3/smbd/pysmbd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Set NT and POSIX ACLs and other VFS operations from Python
   4
   5    Copyrigyt (C) Andrew Bartlett 2012
   6    Copyright (C) Jeremy Allison 1994-2009.
   7    Copyright (C) Andreas Gruenbacher 2002.
   8    Copyright (C) Simo Sorce <idra@samba.org> 2009.
   9    Copyright (C) Simo Sorce 2002
  10    Copyright (C) Eric Lorimer 2002
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27 #include "smbd/smbd.h"
  28 #include <Python.h>
  29 #include "libcli/util/pyerrors.h"
  30 #include "librpc/rpc/pyrpc_util.h"
  31 #include <pytalloc.h>
  32 #include "system/filesys.h"
  33
  34 extern const struct generic_mapping file_generic_mapping;
  35
  36 #undef  DBGC_CLASS
  37 #define DBGC_CLASS DBGC_ACLS
  38
  39 static NTSTATUS set_sys_acl_no_snum(const char *fname,
  40                                      SMB_ACL_TYPE_T acltype,
  41                                      SMB_ACL_T theacl)
  42 {
  43         connection_struct *conn;
  44         NTSTATUS status = NT_STATUS_OK;
  45         int ret;
  46
  47         conn = talloc_zero(NULL, connection_struct);
  48         if (conn == NULL) {
  49                 DEBUG(0, ("talloc failed\n"));
  50                 return NT_STATUS_NO_MEMORY;
  51         }
  52
  53         if (!(conn->params = talloc(conn, struct share_params))) {
  54                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
  55                 TALLOC_FREE(conn);
  56                 return NT_STATUS_NO_MEMORY;
  57         }
  58
  59         conn->params->service = -1;
  60
  61         set_conn_connectpath(conn, "/");
  62
  63         smbd_vfs_init(conn);
  64
  65         ret = SMB_VFS_SYS_ACL_SET_FILE( conn, fname, acltype, theacl);
  66         if (ret != 0) {
  67                 status = map_nt_error_from_unix_common(ret);
  68                 DEBUG(0,("set_nt_acl_no_snum: fset_nt_acl returned zero.\n"));
  69         }
  70
  71         conn_free(conn);
  72
  73         return status;
  74 }
  75
  76 static NTSTATUS set_nt_acl_no_snum(const char *fname,
  77                                    uint32 security_info_sent, const struct security_descriptor *sd)
  78 {
  79         TALLOC_CTX *frame = talloc_stackframe();
  80         connection_struct *conn;
  81         NTSTATUS status = NT_STATUS_OK;
  82         files_struct *fsp;
  83         struct smb_filename *smb_fname = NULL;
  84         int flags;
  85
  86         conn = talloc_zero(frame, connection_struct);
  87         if (conn == NULL) {
  88                 DEBUG(0, ("talloc failed\n"));
  89                 return NT_STATUS_NO_MEMORY;
  90         }
  91
  92         if (!(conn->params = talloc(conn, struct share_params))) {
  93                 DEBUG(0,("set_nt_acl_no_snum: talloc() failed!\n"));
  94                 TALLOC_FREE(frame);
  95                 return NT_STATUS_NO_MEMORY;
  96         }
  97
  98         conn->params->service = -1;
  99
 100         set_conn_connectpath(conn, "/");
 101
 102         smbd_vfs_init(conn);
 103
 104         fsp = talloc_zero(frame, struct files_struct);
 105         if (fsp == NULL) {
 106                 TALLOC_FREE(frame);
 107                 return NT_STATUS_NO_MEMORY;
 108         }
 109         fsp->fh = talloc(fsp, struct fd_handle);
 110         if (fsp->fh == NULL) {
 111                 TALLOC_FREE(frame);
 112                 return NT_STATUS_NO_MEMORY;
 113         }
 114         fsp->conn = conn;
 115
 116         status = create_synthetic_smb_fname_split(fsp, fname, NULL,
 117                                                   &smb_fname);
 118         if (!NT_STATUS_IS_OK(status)) {
 119                 TALLOC_FREE(frame);
 120                 return status;
 121         }
 122
 123         fsp->fsp_name = smb_fname;
 124
 125 #ifdef O_DIRECTORY
 126         flags = O_RDONLY|O_DIRECTORY;
 127 #else
 128         /* POSIX allows us to open a directory with O_RDONLY. */
 129         flags = O_RDONLY;
 130 #endif
 131
 132         fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, O_RDWR, 00400);
 133         if (fsp->fh->fd == -1 && errno == EISDIR) {
 134                 fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, 00400);
 135         }
 136         if (fsp->fh->fd == -1) {
 137                 printf("open: error=%d (%s)\n", errno, strerror(errno));
 138                 TALLOC_FREE(frame);
 139                 return NT_STATUS_UNSUCCESSFUL;
 140         }
 141
 142         status = SMB_VFS_FSET_NT_ACL( fsp, security_info_sent, sd);
 143         if (!NT_STATUS_IS_OK(status)) {
 144                 DEBUG(0,("set_nt_acl_no_snum: fset_nt_acl returned %s.\n", nt_errstr(status)));
 145         }
 146
 147         conn_free(conn);
 148         TALLOC_FREE(frame);
 149
 150         return status;
 151 }
 152
 153
 154 static SMB_ACL_T make_simple_acl(uid_t uid, gid_t gid)
 155 {
 156         mode_t mode = SMB_ACL_READ|SMB_ACL_WRITE;
 157         mode_t mode0 = 0;
 158
 159         SMB_ACL_ENTRY_T entry;
 160         SMB_ACL_T acl = sys_acl_init(4);
 161
 162         if (!acl) {
 163                 return NULL;
 164         }
 165
 166         if (sys_acl_create_entry(&acl, &entry) != 0) {
 167                 TALLOC_FREE(acl);
 168                 return NULL;
 169         }
 170
 171         if (sys_acl_set_tag_type(entry, SMB_ACL_USER_OBJ) != 0) {
 172                 TALLOC_FREE(acl);
 173                 return NULL;
 174         }
 175
 176         if (sys_acl_set_permset(entry, &mode) != 0) {
 177                 TALLOC_FREE(acl);
 178                 return NULL;
 179         }
 180
 181         if (sys_acl_create_entry(&acl, &entry) != 0) {
 182                 TALLOC_FREE(acl);
 183                 return NULL;
 184         }
 185
 186         if (sys_acl_set_tag_type(entry, SMB_ACL_GROUP_OBJ) != 0) {
 187                 TALLOC_FREE(acl);
 188                 return NULL;
 189         }
 190
 191         if (sys_acl_set_permset(entry, &mode) != 0) {
 192                 TALLOC_FREE(acl);
 193                 return NULL;
 194         }
 195
 196         if (sys_acl_create_entry(&acl, &entry) != 0) {
 197                 TALLOC_FREE(acl);
 198                 return NULL;
 199         }
 200
 201         if (sys_acl_set_tag_type(entry, SMB_ACL_OTHER) != 0) {
 202                 TALLOC_FREE(acl);
 203                 return NULL;
 204         }
 205
 206         if (sys_acl_set_permset(entry, &mode0) != 0) {
 207                 TALLOC_FREE(acl);
 208                 return NULL;
 209         }
 210
 211         if (sys_acl_create_entry(&acl, &entry) != 0) {
 212                 TALLOC_FREE(acl);
 213                 return NULL;
 214         }
 215
 216         if (sys_acl_set_tag_type(entry, SMB_ACL_GROUP) != 0) {
 217                 TALLOC_FREE(acl);
 218                 return NULL;
 219         }
 220
 221         if (sys_acl_set_qualifier(entry, &gid) != 0) {
 222                 TALLOC_FREE(acl);
 223                 return NULL;
 224         }
 225
 226         if (sys_acl_set_permset(entry, &mode) != 0) {
 227                 TALLOC_FREE(acl);
 228                 return NULL;
 229         }
 230
 231         if (sys_acl_create_entry(&acl, &entry) != 0) {
 232                 TALLOC_FREE(acl);
 233                 return NULL;
 234         }
 235
 236         if (sys_acl_set_tag_type(entry, SMB_ACL_MASK) != 0) {
 237                 TALLOC_FREE(acl);
 238                 return NULL;
 239         }
 240
 241         if (sys_acl_set_permset(entry, &mode0) != 0) {
 242                 TALLOC_FREE(acl);
 243                 return NULL;
 244         }
 245         return acl;
 246 }
 247
 248 /*
 249   set a simple ACL on a file, as a test
 250  */
 251 static PyObject *py_smbd_set_simple_acl(PyObject *self, PyObject *args)
 252 {
 253         NTSTATUS status;
 254         char *fname;
 255         int uid, gid;
 256         SMB_ACL_T acl;
 257         TALLOC_CTX *frame;
 258
 259         if (!PyArg_ParseTuple(args, "sii", &fname, &uid, &gid))
 260                 return NULL;
 261
 262         acl = make_simple_acl(uid, gid);
 263
 264         frame = talloc_stackframe();
 265
 266         status = set_sys_acl_no_snum(fname, SMB_ACL_TYPE_ACCESS, acl);
 267         TALLOC_FREE(acl);
 268
 269         TALLOC_FREE(frame);
 270
 271         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 272
 273         Py_RETURN_NONE;
 274 }
 275
 276 /*
 277   chown a file
 278  */
 279 static PyObject *py_smbd_chown(PyObject *self, PyObject *args)
 280 {
 281         connection_struct *conn;
 282         NTSTATUS status = NT_STATUS_OK;
 283         int ret;
 284
 285         char *fname;
 286         int uid, gid;
 287         TALLOC_CTX *frame;
 288
 289         if (!PyArg_ParseTuple(args, "sii", &fname, &uid, &gid))
 290                 return NULL;
 291
 292         frame = talloc_stackframe();
 293
 294         conn = talloc_zero(frame, connection_struct);
 295         if (conn == NULL) {
 296                 PyErr_NoMemory();
 297                 return NULL;
 298         }
 299
 300         if (!(conn->params = talloc(conn, struct share_params))) {
 301                 PyErr_NoMemory();
 302                 return NULL;
 303         }
 304
 305         conn->params->service = -1;
 306
 307         set_conn_connectpath(conn, "/");
 308
 309         smbd_vfs_init(conn);
 310
 311         ret = SMB_VFS_CHOWN( conn, fname, uid, gid);
 312         if (ret != 0) {
 313                 status = map_nt_error_from_unix_common(ret);
 314                 DEBUG(0,("chwon returned failure: %s\n", strerror(ret)));
 315         }
 316
 317         conn_free(conn);
 318
 319         TALLOC_FREE(frame);
 320
 321         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 322
 323         Py_RETURN_NONE;
 324 }
 325
 326 /*
 327   check if we have ACL support
 328  */
 329 static PyObject *py_smbd_have_posix_acls(PyObject *self, PyObject *args)
 330 {
 331 #ifdef HAVE_POSIX_ACLS
 332         return PyBool_FromLong(true);
 333 #else
 334         return PyBool_FromLong(false);
 335 #endif
 336 }
 337
 338 /*
 339   set the NT ACL on a file
 340  */
 341 static PyObject *py_smbd_set_nt_acl(PyObject *self, PyObject *args)
 342 {
 343         NTSTATUS status;
 344         char *fname;
 345         int security_info_sent;
 346         PyObject *py_sd;
 347         struct security_descriptor *sd;
 348
 349         if (!PyArg_ParseTuple(args, "siO", &fname, &security_info_sent, &py_sd))
 350                 return NULL;
 351
 352         if (!py_check_dcerpc_type(py_sd, "samba.dcerpc.security", "descriptor")) {
 353                 return NULL;
 354         }
 355
 356         sd = pytalloc_get_type(py_sd, struct security_descriptor);
 357
 358         status = set_nt_acl_no_snum(fname, security_info_sent, sd);
 359         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 360
 361         Py_RETURN_NONE;
 362 }
 363
 364 /*
 365   Return the NT ACL on a file
 366  */
 367 static PyObject *py_smbd_get_nt_acl(PyObject *self, PyObject *args)
 368 {
 369         char *fname;
 370         int security_info_sent;
 371         PyObject *py_sd;
 372         struct security_descriptor *sd;
 373         TALLOC_CTX *tmp_ctx = talloc_new(NULL);
 374
 375         if (!PyArg_ParseTuple(args, "si", &fname, &security_info_sent))
 376                 return NULL;
 377
 378         sd = get_nt_acl_no_snum(tmp_ctx, fname);
 379
 380         py_sd = py_return_ndr_struct("samba.dcerpc.security", "security_descriptor", sd, sd);
 381
 382         talloc_free(tmp_ctx);
 383
 384         return py_sd;
 385 }
 386
 387 /*
 388   set the posix (or similar) ACL on a file
 389  */
 390 static PyObject *py_smbd_set_sys_acl(PyObject *self, PyObject *args)
 391 {
 392         NTSTATUS status;
 393         char *fname;
 394         PyObject *py_acl;
 395         struct smb_acl_t *acl;
 396         int acl_type;
 397
 398         if (!PyArg_ParseTuple(args, "siO", &fname, &acl_type, &py_acl))
 399                 return NULL;
 400
 401         if (!py_check_dcerpc_type(py_acl, "samba.dcerpc.smb_acl", "t")) {
 402                 return NULL;
 403         }
 404
 405         acl = pytalloc_get_type(py_acl, struct smb_acl_t);
 406
 407         status = set_sys_acl_no_snum(fname, acl_type, acl);
 408         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 409
 410         Py_RETURN_NONE;
 411 }
 412
 413 /*
 414   Return the posix (or similar) ACL on a file
 415  */
 416 static PyObject *py_smbd_get_sys_acl(PyObject *self, PyObject *args)
 417 {
 418         char *fname;
 419         PyObject *py_acl;
 420         struct smb_acl_t *acl;
 421         int acl_type;
 422         TALLOC_CTX *frame = talloc_stackframe();
 423         connection_struct *conn;
 424         NTSTATUS status = NT_STATUS_OK;
 425
 426         if (!PyArg_ParseTuple(args, "si", &fname, &acl_type)) {
 427                 TALLOC_FREE(frame);
 428                 return NULL;
 429         }
 430
 431         conn = talloc_zero(frame, connection_struct);
 432         if (conn == NULL) {
 433                 DEBUG(0, ("talloc failed\n"));
 434                 PyErr_NoMemory();
 435                 TALLOC_FREE(frame);
 436                 return NULL;
 437         }
 438
 439         if (!(conn->params = talloc(conn, struct share_params))) {
 440                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
 441                 PyErr_NoMemory();
 442                 TALLOC_FREE(frame);
 443                 return NULL;
 444         }
 445
 446         conn->params->service = -1;
 447
 448         set_conn_connectpath(conn, "/");
 449
 450         smbd_vfs_init(conn);
 451
 452         acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, acl_type);
 453         if (!acl) {
 454                 TALLOC_FREE(frame);
 455                 status = map_nt_error_from_unix_common(errno);
 456                 DEBUG(0,("sys_acl_get_file returned NULL: %s\n", strerror(errno)));
 457                 PyErr_NTSTATUS_IS_ERR_RAISE(status);
 458         }
 459
 460         talloc_steal(frame, acl);
 461         conn_free(conn);
 462
 463         py_acl = py_return_ndr_struct("samba.dcerpc.smb_acl", "t", acl, acl);
 464
 465         TALLOC_FREE(frame);
 466
 467         return py_acl;
 468 }
 469
 470 static PyMethodDef py_smbd_methods[] = {
 471         { "have_posix_acls",
 472                 (PyCFunction)py_smbd_have_posix_acls, METH_VARARGS,
 473                 NULL },
 474         { "set_simple_acl",
 475                 (PyCFunction)py_smbd_set_simple_acl, METH_VARARGS,
 476                 NULL },
 477         { "set_nt_acl",
 478                 (PyCFunction)py_smbd_set_nt_acl, METH_VARARGS,
 479                 NULL },
 480         { "get_nt_acl",
 481                 (PyCFunction)py_smbd_get_nt_acl, METH_VARARGS,
 482                 NULL },
 483         { "get_sys_acl",
 484                 (PyCFunction)py_smbd_get_sys_acl, METH_VARARGS,
 485                 NULL },
 486         { "set_sys_acl",
 487                 (PyCFunction)py_smbd_set_sys_acl, METH_VARARGS,
 488                 NULL },
 489         { "chown",
 490                 (PyCFunction)py_smbd_chown, METH_VARARGS,
 491                 NULL },
 492         { NULL }
 493 };
 494
 495 void initsmbd(void);
 496 void initsmbd(void)
 497 {
 498         PyObject *m;
 499
 500         m = Py_InitModule3("smbd", py_smbd_methods,
 501                            "Python bindings for the smbd file server.");
 502         if (m == NULL)
 503                 return;
 504
 505 }