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