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         mode_t saved_umask;
  47
  48         conn = talloc_zero(NULL, connection_struct);
  49         if (conn == NULL) {
  50                 DEBUG(0, ("talloc failed\n"));
  51                 return NT_STATUS_NO_MEMORY;
  52         }
  53
  54         if (!(conn->params = talloc(conn, struct share_params))) {
  55                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
  56                 TALLOC_FREE(conn);
  57                 return NT_STATUS_NO_MEMORY;
  58         }
  59
  60         /* we want total control over the permissions on created files,
  61            so set our umask to 0 */
  62         saved_umask = umask(0);
  63
  64         conn->params->service = -1;
  65
  66         set_conn_connectpath(conn, "/");
  67
  68         smbd_vfs_init(conn);
  69
  70         ret = SMB_VFS_SYS_ACL_SET_FILE( conn, fname, acltype, theacl);
  71         if (ret != 0) {
  72                 status = map_nt_error_from_unix_common(ret);
  73                 DEBUG(0,("set_nt_acl_no_snum: fset_nt_acl returned zero.\n"));
  74         }
  75
  76         umask(saved_umask);
  77
  78         conn_free(conn);
  79
  80         return status;
  81 }
  82
  83 static NTSTATUS set_nt_acl_no_snum(const char *fname,
  84                                    uint32 security_info_sent, const struct security_descriptor *sd)
  85 {
  86         TALLOC_CTX *frame = talloc_stackframe();
  87         connection_struct *conn;
  88         NTSTATUS status = NT_STATUS_OK;
  89         files_struct *fsp;
  90         struct smb_filename *smb_fname = NULL;
  91         int flags, ret;
  92         mode_t saved_umask;
  93
  94         if (!posix_locking_init(false)) {
  95                 TALLOC_FREE(frame);
  96                 return NT_STATUS_NO_MEMORY;
  97         }
  98
  99         conn = talloc_zero(frame, connection_struct);
 100         if (conn == NULL) {
 101                 TALLOC_FREE(frame);
 102                 DEBUG(0, ("talloc failed\n"));
 103                 return NT_STATUS_NO_MEMORY;
 104         }
 105
 106         if (!(conn->params = talloc(conn, struct share_params))) {
 107                 DEBUG(0,("set_nt_acl_no_snum: talloc() failed!\n"));
 108                 TALLOC_FREE(frame);
 109                 return NT_STATUS_NO_MEMORY;
 110         }
 111
 112         fsp = talloc_zero(frame, struct files_struct);
 113         if (fsp == NULL) {
 114                 TALLOC_FREE(frame);
 115                 return NT_STATUS_NO_MEMORY;
 116         }
 117         fsp->fh = talloc(fsp, struct fd_handle);
 118         if (fsp->fh == NULL) {
 119                 TALLOC_FREE(frame);
 120                 return NT_STATUS_NO_MEMORY;
 121         }
 122         fsp->conn = conn;
 123
 124         /* we want total control over the permissions on created files,
 125            so set our umask to 0 */
 126         saved_umask = umask(0);
 127
 128         conn->params->service = -1;
 129
 130         set_conn_connectpath(conn, "/");
 131
 132         smbd_vfs_init(conn);
 133
 134         status = create_synthetic_smb_fname_split(fsp, fname, NULL,
 135                                                   &smb_fname);
 136         if (!NT_STATUS_IS_OK(status)) {
 137                 TALLOC_FREE(frame);
 138                 umask(saved_umask);
 139                 return status;
 140         }
 141
 142         fsp->fsp_name = smb_fname;
 143
 144 #ifdef O_DIRECTORY
 145         flags = O_RDONLY|O_DIRECTORY;
 146 #else
 147         /* POSIX allows us to open a directory with O_RDONLY. */
 148         flags = O_RDONLY;
 149 #endif
 150
 151         fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, O_RDWR, 00400);
 152         if (fsp->fh->fd == -1 && errno == EISDIR) {
 153                 fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, 00400);
 154         }
 155         if (fsp->fh->fd == -1) {
 156                 printf("open: error=%d (%s)\n", errno, strerror(errno));
 157                 TALLOC_FREE(frame);
 158                 umask(saved_umask);
 159                 return NT_STATUS_UNSUCCESSFUL;
 160         }
 161
 162         ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 163         if (ret == -1) {
 164                 /* If we have an fd, this stat should succeed. */
 165                 DEBUG(0,("Error doing fstat on open file %s "
 166                         "(%s)\n",
 167                         smb_fname_str_dbg(smb_fname),
 168                         strerror(errno) ));
 169                 TALLOC_FREE(frame);
 170                 umask(saved_umask);
 171                 return map_nt_error_from_unix(errno);
 172         }
 173
 174         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
 175         fsp->vuid = UID_FIELD_INVALID;
 176         fsp->file_pid = 0;
 177         fsp->can_lock = True;
 178         fsp->can_read = True;
 179         fsp->can_write = True;
 180         fsp->print_file = NULL;
 181         fsp->modified = False;
 182         fsp->sent_oplock_break = NO_BREAK_SENT;
 183         fsp->is_directory = S_ISDIR(smb_fname->st.st_ex_mode);
 184
 185         status = SMB_VFS_FSET_NT_ACL( fsp, security_info_sent, sd);
 186         if (!NT_STATUS_IS_OK(status)) {
 187                 DEBUG(0,("set_nt_acl_no_snum: fset_nt_acl returned %s.\n", nt_errstr(status)));
 188         }
 189
 190         SMB_VFS_CLOSE(fsp);
 191
 192         conn_free(conn);
 193         TALLOC_FREE(frame);
 194
 195         umask(saved_umask);
 196         return status;
 197 }
 198
 199
 200 static SMB_ACL_T make_simple_acl(gid_t gid, mode_t chmod_mode)
 201 {
 202         TALLOC_CTX *frame = talloc_stackframe();
 203
 204         mode_t mode = SMB_ACL_READ|SMB_ACL_WRITE|SMB_ACL_EXECUTE;
 205
 206         mode_t mode_user = (chmod_mode & 0700) >> 6;
 207         mode_t mode_group = (chmod_mode & 070) >> 3;
 208         mode_t mode_other = chmod_mode &  07;
 209         SMB_ACL_ENTRY_T entry;
 210         SMB_ACL_T acl = sys_acl_init(frame);
 211
 212         if (!acl) {
 213                 return NULL;
 214         }
 215
 216         if (sys_acl_create_entry(&acl, &entry) != 0) {
 217                 TALLOC_FREE(frame);
 218                 return NULL;
 219         }
 220
 221         if (sys_acl_set_tag_type(entry, SMB_ACL_USER_OBJ) != 0) {
 222                 TALLOC_FREE(frame);
 223                 return NULL;
 224         }
 225
 226         if (sys_acl_set_permset(entry, &mode_user) != 0) {
 227                 TALLOC_FREE(frame);
 228                 return NULL;
 229         }
 230
 231         if (sys_acl_create_entry(&acl, &entry) != 0) {
 232                 TALLOC_FREE(frame);
 233                 return NULL;
 234         }
 235
 236         if (sys_acl_set_tag_type(entry, SMB_ACL_GROUP_OBJ) != 0) {
 237                 TALLOC_FREE(frame);
 238                 return NULL;
 239         }
 240
 241         if (sys_acl_set_permset(entry, &mode_group) != 0) {
 242                 TALLOC_FREE(frame);
 243                 return NULL;
 244         }
 245
 246         if (sys_acl_create_entry(&acl, &entry) != 0) {
 247                 TALLOC_FREE(frame);
 248                 return NULL;
 249         }
 250
 251         if (sys_acl_set_tag_type(entry, SMB_ACL_OTHER) != 0) {
 252                 TALLOC_FREE(frame);
 253                 return NULL;
 254         }
 255
 256         if (sys_acl_set_permset(entry, &mode_other) != 0) {
 257                 TALLOC_FREE(frame);
 258                 return NULL;
 259         }
 260
 261         if (gid != -1) {
 262                 if (sys_acl_create_entry(&acl, &entry) != 0) {
 263                         TALLOC_FREE(frame);
 264                         return NULL;
 265                 }
 266
 267                 if (sys_acl_set_tag_type(entry, SMB_ACL_GROUP) != 0) {
 268                         TALLOC_FREE(frame);
 269                         return NULL;
 270                 }
 271
 272                 if (sys_acl_set_qualifier(entry, &gid) != 0) {
 273                         TALLOC_FREE(frame);
 274                         return NULL;
 275                 }
 276
 277                 if (sys_acl_set_permset(entry, &mode_group) != 0) {
 278                         TALLOC_FREE(frame);
 279                         return NULL;
 280                 }
 281         }
 282
 283         if (sys_acl_create_entry(&acl, &entry) != 0) {
 284                 TALLOC_FREE(frame);
 285                 return NULL;
 286         }
 287
 288         if (sys_acl_set_tag_type(entry, SMB_ACL_MASK) != 0) {
 289                 TALLOC_FREE(frame);
 290                 return NULL;
 291         }
 292
 293         if (sys_acl_set_permset(entry, &mode) != 0) {
 294                 TALLOC_FREE(frame);
 295                 return NULL;
 296         }
 297         return acl;
 298 }
 299
 300 /*
 301   set a simple ACL on a file, as a test
 302  */
 303 static PyObject *py_smbd_set_simple_acl(PyObject *self, PyObject *args)
 304 {
 305         NTSTATUS status;
 306         char *fname;
 307         int mode, gid = -1;
 308         SMB_ACL_T acl;
 309         TALLOC_CTX *frame;
 310
 311         if (!PyArg_ParseTuple(args, "si|i", &fname, &mode, &gid))
 312                 return NULL;
 313
 314         acl = make_simple_acl(gid, mode);
 315
 316         frame = talloc_stackframe();
 317
 318         status = set_sys_acl_no_snum(fname, SMB_ACL_TYPE_ACCESS, acl);
 319         TALLOC_FREE(acl);
 320
 321         TALLOC_FREE(frame);
 322
 323         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 324
 325         Py_RETURN_NONE;
 326 }
 327
 328 /*
 329   chown a file
 330  */
 331 static PyObject *py_smbd_chown(PyObject *self, PyObject *args)
 332 {
 333         connection_struct *conn;
 334         NTSTATUS status = NT_STATUS_OK;
 335         int ret;
 336
 337         char *fname;
 338         int uid, gid;
 339         TALLOC_CTX *frame;
 340         mode_t saved_umask;
 341
 342         if (!PyArg_ParseTuple(args, "sii", &fname, &uid, &gid))
 343                 return NULL;
 344
 345         frame = talloc_stackframe();
 346
 347         conn = talloc_zero(frame, connection_struct);
 348         if (conn == NULL) {
 349                 PyErr_NoMemory();
 350                 return NULL;
 351         }
 352
 353         if (!(conn->params = talloc(conn, struct share_params))) {
 354                 PyErr_NoMemory();
 355                 return NULL;
 356         }
 357
 358         /* we want total control over the permissions on created files,
 359            so set our umask to 0 */
 360         saved_umask = umask(0);
 361
 362         conn->params->service = -1;
 363
 364         set_conn_connectpath(conn, "/");
 365
 366         smbd_vfs_init(conn);
 367
 368         ret = SMB_VFS_CHOWN( conn, fname, uid, gid);
 369         if (ret != 0) {
 370                 status = map_nt_error_from_unix_common(errno);
 371                 DEBUG(0,("chown returned failure: %s\n", strerror(errno)));
 372         }
 373
 374         umask(saved_umask);
 375
 376         conn_free(conn);
 377
 378         TALLOC_FREE(frame);
 379
 380         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 381
 382         Py_RETURN_NONE;
 383 }
 384
 385 /*
 386   chown a file
 387  */
 388 static PyObject *py_smbd_unlink(PyObject *self, PyObject *args)
 389 {
 390         connection_struct *conn;
 391         NTSTATUS status = NT_STATUS_OK;
 392         int ret;
 393         struct smb_filename *smb_fname = NULL;
 394         char *fname;
 395         int uid, gid;
 396         TALLOC_CTX *frame;
 397         mode_t saved_umask;
 398
 399         if (!PyArg_ParseTuple(args, "s", &fname))
 400                 return NULL;
 401
 402         frame = talloc_stackframe();
 403
 404         conn = talloc_zero(frame, connection_struct);
 405         if (conn == NULL) {
 406                 PyErr_NoMemory();
 407                 return NULL;
 408         }
 409
 410         if (!(conn->params = talloc(conn, struct share_params))) {
 411                 PyErr_NoMemory();
 412                 return NULL;
 413         }
 414
 415         /* we want total control over the permissions on created files,
 416            so set our umask to 0 */
 417         saved_umask = umask(0);
 418
 419         conn->params->service = -1;
 420
 421         set_conn_connectpath(conn, "/");
 422
 423         smbd_vfs_init(conn);
 424
 425         status = create_synthetic_smb_fname_split(frame, fname, NULL,
 426                                                   &smb_fname);
 427         if (!NT_STATUS_IS_OK(status)) {
 428                 TALLOC_FREE(frame);
 429                 umask(saved_umask);
 430                 PyErr_NTSTATUS_IS_ERR_RAISE(status);
 431         }
 432
 433         ret = SMB_VFS_UNLINK(conn, smb_fname);
 434         if (ret != 0) {
 435                 status = map_nt_error_from_unix_common(errno);
 436                 DEBUG(0,("unlink returned failure: %s\n", strerror(errno)));
 437         }
 438
 439         umask(saved_umask);
 440
 441         conn_free(conn);
 442
 443         TALLOC_FREE(frame);
 444
 445         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 446
 447         Py_RETURN_NONE;
 448 }
 449
 450 /*
 451   check if we have ACL support
 452  */
 453 static PyObject *py_smbd_have_posix_acls(PyObject *self, PyObject *args)
 454 {
 455 #ifdef HAVE_POSIX_ACLS
 456         return PyBool_FromLong(true);
 457 #else
 458         return PyBool_FromLong(false);
 459 #endif
 460 }
 461
 462 /*
 463   set the NT ACL on a file
 464  */
 465 static PyObject *py_smbd_set_nt_acl(PyObject *self, PyObject *args)
 466 {
 467         NTSTATUS status;
 468         char *fname;
 469         int security_info_sent;
 470         PyObject *py_sd;
 471         struct security_descriptor *sd;
 472
 473         if (!PyArg_ParseTuple(args, "siO", &fname, &security_info_sent, &py_sd))
 474                 return NULL;
 475
 476         if (!py_check_dcerpc_type(py_sd, "samba.dcerpc.security", "descriptor")) {
 477                 return NULL;
 478         }
 479
 480         sd = pytalloc_get_type(py_sd, struct security_descriptor);
 481
 482         status = set_nt_acl_no_snum(fname, security_info_sent, sd);
 483         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 484
 485         Py_RETURN_NONE;
 486 }
 487
 488 /*
 489   Return the NT ACL on a file
 490  */
 491 static PyObject *py_smbd_get_nt_acl(PyObject *self, PyObject *args)
 492 {
 493         char *fname;
 494         int security_info_wanted;
 495         PyObject *py_sd;
 496         struct security_descriptor *sd;
 497         TALLOC_CTX *tmp_ctx = talloc_new(NULL);
 498
 499         if (!PyArg_ParseTuple(args, "si", &fname, &security_info_wanted))
 500                 return NULL;
 501
 502         sd = get_nt_acl_no_snum(tmp_ctx, fname, security_info_wanted);
 503
 504         py_sd = py_return_ndr_struct("samba.dcerpc.security", "descriptor", sd, sd);
 505
 506         talloc_free(tmp_ctx);
 507
 508         return py_sd;
 509 }
 510
 511 /*
 512   set the posix (or similar) ACL on a file
 513  */
 514 static PyObject *py_smbd_set_sys_acl(PyObject *self, PyObject *args)
 515 {
 516         NTSTATUS status;
 517         char *fname;
 518         PyObject *py_acl;
 519         struct smb_acl_t *acl;
 520         int acl_type;
 521
 522         if (!PyArg_ParseTuple(args, "siO", &fname, &acl_type, &py_acl))
 523                 return NULL;
 524
 525         if (!py_check_dcerpc_type(py_acl, "samba.dcerpc.smb_acl", "t")) {
 526                 return NULL;
 527         }
 528
 529         acl = pytalloc_get_type(py_acl, struct smb_acl_t);
 530
 531         status = set_sys_acl_no_snum(fname, acl_type, acl);
 532         PyErr_NTSTATUS_IS_ERR_RAISE(status);
 533
 534         Py_RETURN_NONE;
 535 }
 536
 537 /*
 538   Return the posix (or similar) ACL on a file
 539  */
 540 static PyObject *py_smbd_get_sys_acl(PyObject *self, PyObject *args)
 541 {
 542         char *fname;
 543         PyObject *py_acl;
 544         struct smb_acl_t *acl;
 545         int acl_type;
 546         TALLOC_CTX *frame = talloc_stackframe();
 547         connection_struct *conn;
 548         NTSTATUS status = NT_STATUS_OK;
 549
 550         if (!PyArg_ParseTuple(args, "si", &fname, &acl_type)) {
 551                 TALLOC_FREE(frame);
 552                 return NULL;
 553         }
 554
 555         conn = talloc_zero(frame, connection_struct);
 556         if (conn == NULL) {
 557                 DEBUG(0, ("talloc failed\n"));
 558                 PyErr_NoMemory();
 559                 TALLOC_FREE(frame);
 560                 return NULL;
 561         }
 562
 563         if (!(conn->params = talloc(conn, struct share_params))) {
 564                 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
 565                 PyErr_NoMemory();
 566                 TALLOC_FREE(frame);
 567                 return NULL;
 568         }
 569
 570         conn->params->service = -1;
 571
 572         set_conn_connectpath(conn, "/");
 573
 574         smbd_vfs_init(conn);
 575
 576         acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, acl_type, frame);
 577         if (!acl) {
 578                 TALLOC_FREE(frame);
 579                 status = map_nt_error_from_unix_common(errno);
 580                 DEBUG(0,("sys_acl_get_file returned NULL: %s\n", strerror(errno)));
 581                 PyErr_NTSTATUS_IS_ERR_RAISE(status);
 582         }
 583
 584         conn_free(conn);
 585
 586         py_acl = py_return_ndr_struct("samba.dcerpc.smb_acl", "t", acl, acl);
 587
 588         TALLOC_FREE(frame);
 589
 590         return py_acl;
 591 }
 592
 593 static PyMethodDef py_smbd_methods[] = {
 594         { "have_posix_acls",
 595                 (PyCFunction)py_smbd_have_posix_acls, METH_VARARGS,
 596                 NULL },
 597         { "set_simple_acl",
 598                 (PyCFunction)py_smbd_set_simple_acl, METH_VARARGS,
 599                 NULL },
 600         { "set_nt_acl",
 601                 (PyCFunction)py_smbd_set_nt_acl, METH_VARARGS,
 602                 NULL },
 603         { "get_nt_acl",
 604                 (PyCFunction)py_smbd_get_nt_acl, METH_VARARGS,
 605                 NULL },
 606         { "get_sys_acl",
 607                 (PyCFunction)py_smbd_get_sys_acl, METH_VARARGS,
 608                 NULL },
 609         { "set_sys_acl",
 610                 (PyCFunction)py_smbd_set_sys_acl, METH_VARARGS,
 611                 NULL },
 612         { "chown",
 613                 (PyCFunction)py_smbd_chown, METH_VARARGS,
 614                 NULL },
 615         { "unlink",
 616                 (PyCFunction)py_smbd_unlink, METH_VARARGS,
 617                 NULL },
 618         { NULL }
 619 };
 620
 621 void initsmbd(void);
 622 void initsmbd(void)
 623 {
 624         PyObject *m;
 625
 626         m = Py_InitModule3("smbd", py_smbd_methods,
 627                            "Python bindings for the smbd file server.");
 628         if (m == NULL)
 629                 return;
 630
 631 }