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,("set_sys_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_sys_acl_no_snum: SMB_VFS_SYS_ACL_SET_FILE "
  69                          "returned zero.\n"));
  70         }
  71
  72         conn_free(conn);
  73
  74         return status;
  75 }
  76
  77 static NTSTATUS set_nt_acl_no_snum(const char *fname,
  78                                    uint32 security_info_sent, const struct security_descriptor *sd)
  79 {
  80         TALLOC_CTX *frame = talloc_stackframe();
  81         connection_struct *conn;
  82         NTSTATUS status = NT_STATUS_OK;
  83         files_struct *fsp;
  84         struct smb_filename *smb_fname = NULL;
  85         int flags;
  86
  87         conn = talloc_zero(frame, connection_struct);
  88         if (conn == NULL) {
  89                 DEBUG(0, ("talloc failed\n"));
  90                 return NT_STATUS_NO_MEMORY;
  91         }
  92
  93         if (!(conn->params = talloc(conn, struct share_params))) {
  94                 DEBUG(0,("set_nt_acl_no_snum: talloc() failed!\n"));
  95                 TALLOC_FREE(frame);
  96                 return NT_STATUS_NO_MEMORY;
  97         }
  98
  99         conn->params->service = -1;
 100
 101         set_conn_connectpath(conn, "/");
 102
 103         smbd_vfs_init(conn);
 104
 105         fsp = talloc_zero(frame, struct files_struct);
 106         if (fsp == NULL) {
 107                 TALLOC_FREE(frame);
 108                 return NT_STATUS_NO_MEMORY;
 109         }
 110         fsp->fh = talloc(fsp, struct fd_handle);
 111         if (fsp->fh == NULL) {
 112                 TALLOC_FREE(frame);
 113                 return NT_STATUS_NO_MEMORY;
 114         }
 115         fsp->conn = conn;
 116
 117         status = create_synthetic_smb_fname_split(fsp, fname, NULL,
 118                                                   &smb_fname);
 119         if (!NT_STATUS_IS_OK(status)) {
 120                 TALLOC_FREE(frame);
 121                 return status;
 122         }
 123
 124         fsp->fsp_name = smb_fname;
 125
 126 #ifdef O_DIRECTORY
 127         flags = O_RDONLY|O_DIRECTORY;
 128 #else
 129         /* POSIX allows us to open a directory with O_RDONLY. */
 130         flags = O_RDONLY;
 131 #endif
 132
 133         fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, O_RDWR, 00400);
 134         if (fsp->fh->fd == -1 && errno == EISDIR) {
 135                 fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, 00400);
 136         }
 137         if (fsp->fh->fd == -1) {
 138                 printf("open: error=%d (%s)\n", errno, strerror(errno));
 139                 TALLOC_FREE(frame);
 140                 return NT_STATUS_UNSUCCESSFUL;
 141         }
 142
 143         status = SMB_VFS_FSET_NT_ACL( fsp, security_info_sent, sd);
 144         if (!NT_STATUS_IS_OK(status)) {
 145                 DEBUG(0,("set_nt_acl_no_snum: fset_nt_acl returned %s.\n", nt_errstr(status)));
 146         }
 147
 148         conn_free(conn);
 149         TALLOC_FREE(frame);
 150
 151         return status;
 152 }
 153
 154
 155 static SMB_ACL_T make_simple_acl(gid_t gid, mode_t chmod_mode)
 156 {
 157         mode_t mode = SMB_ACL_READ|SMB_ACL_WRITE;
 158
 159         mode_t mode_user = (chmod_mode & 0700) >> 16;
 160         mode_t mode_group = (chmod_mode & 070) >> 8;
 161         mode_t mode_other = chmod_mode &  07;
 162
 163         SMB_ACL_ENTRY_T entry;
 164         SMB_ACL_T acl = sys_acl_init();
 165
 166         if (!acl) {
 167                 return NULL;
 168         }
 169
 170         if (sys_acl_create_entry(&acl, &entry) != 0) {
 171                 TALLOC_FREE(acl);
 172                 return NULL;
 173         }
 174
 175         if (sys_acl_set_tag_type(entry, SMB_ACL_USER_OBJ) != 0) {
 176                 TALLOC_FREE(acl);
 177                 return NULL;
 178         }
 179
 180         if (sys_acl_set_permset(entry, &mode_user) != 0) {
 181                 TALLOC_FREE(acl);
 182                 return NULL;
 183         }
 184
 185         if (sys_acl_create_entry(&acl, &entry) != 0) {
 186                 TALLOC_FREE(acl);
 187                 return NULL;
 188         }
 189
 190         if (sys_acl_set_tag_type(entry, SMB_ACL_GROUP_OBJ) != 0) {
 191                 TALLOC_FREE(acl);
 192                 return NULL;
 193         }
 194
 195         if (sys_acl_set_permset(entry, &mode_group) != 0) {
 196                 TALLOC_FREE(acl);
 197                 return NULL;
 198         }
 199
 200         if (sys_acl_create_entry(&acl, &entry) != 0) {
 201                 TALLOC_FREE(acl);
 202                 return NULL;
 203         }
 204
 205         if (sys_acl_set_tag_type(entry, SMB_ACL_OTHER) != 0) {
 206                 TALLOC_FREE(acl);
 207                 return NULL;
 208         }
 209
 210         if (sys_acl_set_permset(entry, &mode_other) != 0) {
 211                 TALLOC_FREE(acl);
 212                 return NULL;
 213         }
 214
 215         if (gid != -1) {
 216                 if (sys_acl_create_entry(&acl, &entry) != 0) {
 217                         TALLOC_FREE(acl);
 218                         return NULL;
 219                 }
 220
 221                 if (sys_acl_set_tag_type(entry, SMB_ACL_GROUP) != 0) {
 222                         TALLOC_FREE(acl);
 223                         return NULL;
 224                 }
 225
 226                 if (sys_acl_set_qualifier(entry, &gid) != 0) {
 227                         TALLOC_FREE(acl);
 228                         return NULL;
 229                 }
 230
 231                 if (sys_acl_set_permset(entry, &mode_group) != 0) {
 232                         TALLOC_FREE(acl);
 233                         return NULL;
 234                 }
 235         }
 236
 237         if (sys_acl_create_entry(&acl, &entry) != 0) {
 238                 TALLOC_FREE(acl);
 239                 return NULL;
 240         }
 241
 242         if (sys_acl_set_tag_type(entry, SMB_ACL_MASK) != 0) {
 243                 TALLOC_FREE(acl);
 244                 return NULL;
 245         }
 246
 247         if (sys_acl_set_permset(entry, &mode) != 0) {
 248                 TALLOC_FREE(acl);
 249                 return NULL;
 250         }
 251         return acl;
 252 }
 253
 254 /*
 255   set a simple ACL on a file, as a test
 256  */
 257 static PyObject *py_smbd_set_simple_acl(PyObject *self, PyObject *args)
 258 {
 259         NTSTATUS status;
 260         char *fname;
 261         int mode, gid = -1;
 262         SMB_ACL_T acl;
 263         TALLOC_CTX *frame;
 264
 265         if (!PyArg_ParseTuple(args, "si|i", &fname, &mode, &gid))
 266                 return NULL;
 267
 268         acl = make_simple_acl(gid, mode);
 269
 270         frame = talloc_stackframe();
 271
 272         status = set_sys_acl_no_snum(fname, SMB_ACL_TYPE_ACCESS, acl);
 273         TALLOC_FREE(acl);
 274
 275         TALLOC_FREE(frame);
 276
 277         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 278
 279         Py_RETURN_NONE;
 280 }
 281
 282 /*
 283   chown a file
 284  */
 285 static PyObject *py_smbd_chown(PyObject *self, PyObject *args)
 286 {
 287         connection_struct *conn;
 288         NTSTATUS status = NT_STATUS_OK;
 289         int ret;
 290
 291         char *fname;
 292         int uid, gid;
 293         TALLOC_CTX *frame;
 294
 295         if (!PyArg_ParseTuple(args, "sii", &fname, &uid, &gid))
 296                 return NULL;
 297
 298         frame = talloc_stackframe();
 299
 300         conn = talloc_zero(frame, connection_struct);
 301         if (conn == NULL) {
 302                 PyErr_NoMemory();
 303                 return NULL;
 304         }
 305
 306         if (!(conn->params = talloc(conn, struct share_params))) {
 307                 PyErr_NoMemory();
 308                 return NULL;
 309         }
 310
 311         conn->params->service = -1;
 312
 313         set_conn_connectpath(conn, "/");
 314
 315         smbd_vfs_init(conn);
 316
 317         ret = SMB_VFS_CHOWN( conn, fname, uid, gid);
 318         if (ret != 0) {
 319                 status = map_nt_error_from_unix_common(errno);
 320                 DEBUG(0,("chown returned failure: %s\n", strerror(errno)));
 321         }
 322
 323         conn_free(conn);
 324
 325         TALLOC_FREE(frame);
 326
 327         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 328
 329         Py_RETURN_NONE;
 330 }
 331
 332 /*
 333   check if we have ACL support
 334  */
 335 static PyObject *py_smbd_have_posix_acls(PyObject *self, PyObject *args)
 336 {
 337 #ifdef HAVE_POSIX_ACLS
 338         return PyBool_FromLong(true);
 339 #else
 340         return PyBool_FromLong(false);
 341 #endif
 342 }
 343
 344 /*
 345   set the NT ACL on a file
 346  */
 347 static PyObject *py_smbd_set_nt_acl(PyObject *self, PyObject *args)
 348 {
 349         NTSTATUS status;
 350         char *fname;
 351         int security_info_sent;
 352         PyObject *py_sd;
 353         struct security_descriptor *sd;
 354
 355         if (!PyArg_ParseTuple(args, "siO", &fname, &security_info_sent, &py_sd))
 356                 return NULL;
 357
 358         if (!py_check_dcerpc_type(py_sd, "samba.dcerpc.security", "descriptor")) {
 359                 return NULL;
 360         }
 361
 362         sd = pytalloc_get_type(py_sd, struct security_descriptor);
 363
 364         status = set_nt_acl_no_snum(fname, security_info_sent, sd);
 365         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 366
 367         Py_RETURN_NONE;
 368 }
 369
 370 /*
 371   Return the NT ACL on a file
 372  */
 373 static PyObject *py_smbd_get_nt_acl(PyObject *self, PyObject *args)
 374 {
 375         char *fname;
 376         int security_info_wanted;
 377         PyObject *py_sd;
 378         struct security_descriptor *sd;
 379         TALLOC_CTX *tmp_ctx = talloc_new(NULL);
 380
 381         if (!PyArg_ParseTuple(args, "si", &fname, &security_info_wanted))
 382                 return NULL;
 383
 384         sd = get_nt_acl_no_snum(tmp_ctx, fname, security_info_wanted);
 385
 386         py_sd = py_return_ndr_struct("samba.dcerpc.security", "descriptor", sd, sd);
 387
 388         talloc_free(tmp_ctx);
 389
 390         return py_sd;
 391 }
 392
 393 /*
 394   set the posix (or similar) ACL on a file
 395  */
 396 static PyObject *py_smbd_set_sys_acl(PyObject *self, PyObject *args)
 397 {
 398         NTSTATUS status;
 399         char *fname;
 400         PyObject *py_acl;
 401         struct smb_acl_t *acl;
 402         int acl_type;
 403
 404         if (!PyArg_ParseTuple(args, "siO", &fname, &acl_type, &py_acl))
 405                 return NULL;
 406
 407         if (!py_check_dcerpc_type(py_acl, "samba.dcerpc.smb_acl", "t")) {
 408                 return NULL;
 409         }
 410
 411         acl = pytalloc_get_type(py_acl, struct smb_acl_t);
 412
 413         status = set_sys_acl_no_snum(fname, acl_type, acl);
 414         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 415
 416         Py_RETURN_NONE;
 417 }
 418
 419 /*
 420   Return the posix (or similar) ACL on a file
 421  */
 422 static PyObject *py_smbd_get_sys_acl(PyObject *self, PyObject *args)
 423 {
 424         char *fname;
 425         PyObject *py_acl;
 426         struct smb_acl_t *acl;
 427         int acl_type;
 428         TALLOC_CTX *frame = talloc_stackframe();
 429         connection_struct *conn;
 430         NTSTATUS status = NT_STATUS_OK;
 431
 432         if (!PyArg_ParseTuple(args, "si", &fname, &acl_type)) {
 433                 TALLOC_FREE(frame);
 434                 return NULL;
 435         }
 436
 437         conn = talloc_zero(frame, connection_struct);
 438         if (conn == NULL) {
 439                 DEBUG(0, ("talloc failed\n"));
 440                 PyErr_NoMemory();
 441                 TALLOC_FREE(frame);
 442                 return NULL;
 443         }
 444
 445         if (!(conn->params = talloc(conn, struct share_params))) {
 446                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
 447                 PyErr_NoMemory();
 448                 TALLOC_FREE(frame);
 449                 return NULL;
 450         }
 451
 452         conn->params->service = -1;
 453
 454         set_conn_connectpath(conn, "/");
 455
 456         smbd_vfs_init(conn);
 457
 458         acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, acl_type);
 459         if (!acl) {
 460                 TALLOC_FREE(frame);
 461                 status = map_nt_error_from_unix_common(errno);
 462                 DEBUG(0,("sys_acl_get_file returned NULL: %s\n", strerror(errno)));
 463                 PyErr_NTSTATUS_IS_ERR_RAISE(status);
 464         }
 465
 466         talloc_steal(frame, acl);
 467         conn_free(conn);
 468
 469         py_acl = py_return_ndr_struct("samba.dcerpc.smb_acl", "t", acl, acl);
 470
 471         TALLOC_FREE(frame);
 472
 473         return py_acl;
 474 }
 475
 476 static PyMethodDef py_smbd_methods[] = {
 477         { "have_posix_acls",
 478                 (PyCFunction)py_smbd_have_posix_acls, METH_VARARGS,
 479                 NULL },
 480         { "set_simple_acl",
 481                 (PyCFunction)py_smbd_set_simple_acl, METH_VARARGS,
 482                 NULL },
 483         { "set_nt_acl",
 484                 (PyCFunction)py_smbd_set_nt_acl, METH_VARARGS,
 485                 NULL },
 486         { "get_nt_acl",
 487                 (PyCFunction)py_smbd_get_nt_acl, METH_VARARGS,
 488                 NULL },
 489         { "get_sys_acl",
 490                 (PyCFunction)py_smbd_get_sys_acl, METH_VARARGS,
 491                 NULL },
 492         { "set_sys_acl",
 493                 (PyCFunction)py_smbd_set_sys_acl, METH_VARARGS,
 494                 NULL },
 495         { "chown",
 496                 (PyCFunction)py_smbd_chown, METH_VARARGS,
 497                 NULL },
 498         { NULL }
 499 };
 500
 501 void initsmbd(void);
 502 void initsmbd(void)
 503 {
 504         PyObject *m;
 505
 506         m = Py_InitModule3("smbd", py_smbd_methods,
 507                            "Python bindings for the smbd file server.");
 508         if (m == NULL)
 509                 return;
 510
 511 }