1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #include <smbsrv/smb_incl.h> 27 #include <smbsrv/smb_fsops.h> 28 #include <smbsrv/smbinfo.h> 29 #include <sys/nbmlock.h> 30 31 static int smb_delete_check_path(smb_request_t *, boolean_t *); 32 static int smb_delete_single_file(smb_request_t *, smb_error_t *); 33 static int smb_delete_multiple_files(smb_request_t *, smb_error_t *); 34 static int smb_delete_find_fname(smb_request_t *, smb_odir_t *, char *, int); 35 static int smb_delete_check_dosattr(smb_request_t *, smb_error_t *); 36 static int smb_delete_remove_file(smb_request_t *, smb_error_t *); 37 38 static void smb_delete_error(smb_error_t *, uint32_t, uint16_t, uint16_t); 39 40 /* 41 * smb_com_delete 42 * 43 * The delete file message is sent to delete a data file. The appropriate 44 * Tid and additional pathname are passed. Read only files may not be 45 * deleted, the read-only attribute must be reset prior to file deletion. 46 * 47 * NT supports a hidden permission known as File Delete Child (FDC). If 48 * the user has FullControl access to a directory, the user is permitted 49 * to delete any object in the directory regardless of the permissions 50 * on the object. 51 * 52 * Client Request Description 53 * ================================== ================================= 54 * UCHAR WordCount; Count of parameter words = 1 55 * USHORT SearchAttributes; 56 * USHORT ByteCount; Count of data bytes; min = 2 57 * UCHAR BufferFormat; 0x04 58 * STRING FileName[]; File name 59 * 60 * Multiple files may be deleted in response to a single request as 61 * SMB_COM_DELETE supports wildcards 62 * 63 * SearchAttributes indicates the attributes that the target file(s) must 64 * have. If the attribute is zero then only normal files are deleted. If 65 * the system file or hidden attributes are specified then the delete is 66 * inclusive -both the specified type(s) of files and normal files are 67 * deleted. Attributes are described in the "Attribute Encoding" section 68 * of this document. 69 * 70 * If bit0 of the Flags2 field of the SMB header is set, a pattern is 71 * passed in, and the file has a long name, then the passed pattern much 72 * match the long file name for the delete to succeed. If bit0 is clear, a 73 * pattern is passed in, and the file has a long name, then the passed 74 * pattern must match the file's short name for the deletion to succeed. 75 * 76 * Server Response Description 77 * ================================== ================================= 78 * UCHAR WordCount; Count of parameter words = 0 79 * USHORT ByteCount; Count of data bytes = 0 80 * 81 * 4.2.10.1 Errors 82 * 83 * ERRDOS/ERRbadpath 84 * ERRDOS/ERRbadfile 85 * ERRDOS/ERRnoaccess 86 * ERRDOS/ERRbadshare # returned by NT for files that are already open 87 * ERRHRD/ERRnowrite 88 * ERRSRV/ERRaccess 89 * ERRSRV/ERRinvdevice 90 * ERRSRV/ERRinvid 91 * ERRSRV/ERRbaduid 92 */ 93 smb_sdrc_t 94 smb_pre_delete(smb_request_t *sr) 95 { 96 int rc; 97 smb_fqi_t *fqi; 98 99 fqi = &sr->arg.dirop.fqi; 100 101 if ((rc = smbsr_decode_vwv(sr, "w", &fqi->fq_sattr)) == 0) 102 rc = smbsr_decode_data(sr, "%S", sr, &fqi->fq_path.pn_path); 103 104 DTRACE_SMB_2(op__Delete__start, smb_request_t *, sr, smb_fqi_t *, fqi); 105 106 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR); 107 } 108 109 void 110 smb_post_delete(smb_request_t *sr) 111 { 112 DTRACE_SMB_1(op__Delete__done, smb_request_t *, sr); 113 } 114 115 /* 116 * smb_com_delete 117 * 118 * 1. pre-process pathname - smb_delete_check_path() 119 * checks dot, bad path syntax, wildcards in path 120 * 121 * 2. process the path to get directory node & last_comp, 122 * store these in fqi 123 * - If smb_pathname_reduce cannot find the specified path, 124 * the error (ENOTDIR) is translated to NT_STATUS_OBJECT_PATH_NOT_FOUND 125 * if the target is a single file (no wildcards). If there are 126 * wildcards in the last_comp, NT_STATUS_OBJECT_NAME_NOT_FOUND is 127 * used instead. 128 * - If the directory node is the mount point and the last component 129 * is ".." NT_STATUS_OBJECT_PATH_SYNTAX_BAD is returned. 130 * 131 * 3. check access permissions 132 * 133 * 4. invoke the appropriate deletion routine to find and remove 134 * the specified file(s). 135 * - if target is a single file (no wildcards) - smb_delete_single_file 136 * - if the target contains wildcards - smb_delete_multiple_files 137 * 138 * Returns: SDRC_SUCCESS or SDRC_ERROR 139 */ 140 smb_sdrc_t 141 smb_com_delete(smb_request_t *sr) 142 { 143 int rc; 144 smb_error_t err; 145 uint32_t status; 146 boolean_t wildcards; 147 smb_fqi_t *fqi; 148 149 fqi = &sr->arg.dirop.fqi; 150 151 if (smb_delete_check_path(sr, &wildcards) != 0) 152 return (SDRC_ERROR); 153 154 rc = smb_pathname_reduce(sr, sr->user_cr, fqi->fq_path.pn_path, 155 sr->tid_tree->t_snode, sr->tid_tree->t_snode, 156 &fqi->fq_dnode, fqi->fq_last_comp); 157 if (rc == 0) { 158 if (fqi->fq_dnode->vp->v_type != VDIR) { 159 smb_node_release(fqi->fq_dnode); 160 rc = ENOTDIR; 161 } 162 } 163 if (rc != 0) { 164 if (rc == ENOTDIR) { 165 if (wildcards) 166 status = NT_STATUS_OBJECT_NAME_NOT_FOUND; 167 else 168 status = NT_STATUS_OBJECT_PATH_NOT_FOUND; 169 smbsr_error(sr, status, ERRDOS, ERROR_FILE_NOT_FOUND); 170 } else { 171 smbsr_errno(sr, rc); 172 } 173 174 return (SDRC_ERROR); 175 } 176 177 if ((fqi->fq_dnode == sr->tid_tree->t_snode) && 178 (strcmp(fqi->fq_last_comp, "..") == 0)) { 179 smb_node_release(fqi->fq_dnode); 180 smbsr_error(sr, NT_STATUS_OBJECT_PATH_SYNTAX_BAD, 181 ERRDOS, ERROR_BAD_PATHNAME); 182 return (SDRC_ERROR); 183 } 184 185 rc = smb_fsop_access(sr, sr->user_cr, fqi->fq_dnode, 186 FILE_LIST_DIRECTORY); 187 if (rc != 0) { 188 smb_node_release(fqi->fq_dnode); 189 smbsr_error(sr, NT_STATUS_ACCESS_DENIED, 190 ERRDOS, ERROR_ACCESS_DENIED); 191 return (SDRC_ERROR); 192 } 193 194 if (wildcards) 195 rc = smb_delete_multiple_files(sr, &err); 196 else 197 rc = smb_delete_single_file(sr, &err); 198 199 smb_node_release(fqi->fq_dnode); 200 201 if (rc != 0) 202 smbsr_set_error(sr, &err); 203 else 204 rc = smbsr_encode_empty_result(sr); 205 206 return (rc == 0 ? SDRC_SUCCESS : SDRC_ERROR); 207 } 208 209 /* 210 * smb_delete_single_file 211 * 212 * Find the specified file and, if its attributes match the search 213 * criteria, delete it. 214 * 215 * Returns 0 - success (file deleted) 216 * -1 - error, err is populated with error details 217 */ 218 static int 219 smb_delete_single_file(smb_request_t *sr, smb_error_t *err) 220 { 221 smb_fqi_t *fqi; 222 uint32_t status; 223 224 fqi = &sr->arg.dirop.fqi; 225 226 smb_pathname_setup(sr, &fqi->fq_path); 227 status = smb_validate_object_name(&fqi->fq_path); 228 if (status != NT_STATUS_SUCCESS) { 229 smb_delete_error(err, status, ERRDOS, ERROR_INVALID_NAME); 230 return (-1); 231 } 232 233 if (smb_fsop_lookup_name(sr, sr->user_cr, 0, sr->tid_tree->t_snode, 234 fqi->fq_dnode, fqi->fq_last_comp, &fqi->fq_fnode) != 0) { 235 smb_delete_error(err, NT_STATUS_OBJECT_NAME_NOT_FOUND, 236 ERRDOS, ERROR_FILE_NOT_FOUND); 237 return (-1); 238 } 239 240 if (smb_delete_check_dosattr(sr, err) != 0) { 241 smb_node_release(fqi->fq_fnode); 242 return (-1); 243 } 244 245 if (smb_delete_remove_file(sr, err) != 0) { 246 smb_node_release(fqi->fq_fnode); 247 return (-1); 248 } 249 250 smb_node_release(fqi->fq_fnode); 251 return (0); 252 } 253 254 /* 255 * smb_delete_multiple_files 256 * 257 * For each matching file found by smb_delete_find_fname: 258 * 1. lookup file 259 * 2. check the file's attributes 260 * - The search ends with an error if a readonly file 261 * (NT_STATUS_CANNOT_DELETE) is matched. 262 * - The search ends (but not an error) if a directory is 263 * matched and the request's search did not include 264 * directories. 265 * - Otherwise, if smb_delete_check_dosattr fails the file 266 * is skipped and the search continues (at step 1) 267 * 3. delete the file 268 * 269 * Returns 0 - success 270 * -1 - error, err is populated with error details 271 */ 272 static int 273 smb_delete_multiple_files(smb_request_t *sr, smb_error_t *err) 274 { 275 int rc, deleted = 0; 276 smb_fqi_t *fqi; 277 uint16_t odid; 278 smb_odir_t *od; 279 char namebuf[MAXNAMELEN]; 280 281 fqi = &sr->arg.dirop.fqi; 282 283 /* 284 * Specify all search attributes (SMB_SEARCH_ATTRIBUTES) so that 285 * delete-specific checking can be done (smb_delete_check_dosattr). 286 */ 287 odid = smb_odir_open(sr, fqi->fq_path.pn_path, 288 SMB_SEARCH_ATTRIBUTES, 0); 289 if (odid == 0) 290 return (-1); 291 292 if ((od = smb_tree_lookup_odir(sr->tid_tree, odid)) == NULL) 293 return (-1); 294 295 for (;;) { 296 rc = smb_delete_find_fname(sr, od, namebuf, MAXNAMELEN); 297 if (rc != 0) 298 break; 299 300 rc = smb_fsop_lookup_name(sr, sr->user_cr, 0, 301 sr->tid_tree->t_snode, fqi->fq_dnode, 302 namebuf, &fqi->fq_fnode); 303 if (rc != 0) 304 break; 305 306 if (smb_delete_check_dosattr(sr, err) != 0) { 307 smb_node_release(fqi->fq_fnode); 308 if (err->status == NT_STATUS_CANNOT_DELETE) { 309 smb_odir_close(od); 310 smb_odir_release(od); 311 return (-1); 312 } 313 if ((err->status == NT_STATUS_FILE_IS_A_DIRECTORY) && 314 (SMB_SEARCH_DIRECTORY(fqi->fq_sattr) != 0)) 315 break; 316 continue; 317 } 318 319 if (smb_delete_remove_file(sr, err) == 0) { 320 ++deleted; 321 smb_node_release(fqi->fq_fnode); 322 continue; 323 } 324 if (err->status == NT_STATUS_OBJECT_NAME_NOT_FOUND) { 325 smb_node_release(fqi->fq_fnode); 326 continue; 327 } 328 329 smb_odir_close(od); 330 smb_odir_release(od); 331 smb_node_release(fqi->fq_fnode); 332 return (-1); 333 } 334 335 smb_odir_close(od); 336 smb_odir_release(od); 337 338 if ((rc != 0) && (rc != ENOENT)) { 339 smbsr_map_errno(rc, err); 340 return (-1); 341 } 342 343 if (deleted == 0) { 344 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 345 ERRDOS, ERROR_FILE_NOT_FOUND); 346 return (-1); 347 } 348 349 return (0); 350 } 351 352 /* 353 * smb_delete_find_fname 354 * 355 * Find next filename that matches search pattern and return it 356 * in namebuf. 357 * 358 * Case insensitivity note: 359 * If the tree is case insensitive and there's a case conflict 360 * with the name returned from smb_odir_read, smb_delete_find_fname 361 * performs case conflict name mangling to produce a unique filename. 362 * This ensures that any subsequent smb_fsop_lookup, (which will 363 * find the first case insensitive match) will find the correct file. 364 * 365 * Returns: 0 - success 366 * errno 367 */ 368 static int 369 smb_delete_find_fname(smb_request_t *sr, smb_odir_t *od, char *namebuf, int len) 370 { 371 int rc; 372 smb_odirent_t *odirent; 373 boolean_t eos; 374 char *name; 375 char shortname[SMB_SHORTNAMELEN]; 376 char name83[SMB_SHORTNAMELEN]; 377 378 odirent = kmem_alloc(sizeof (smb_odirent_t), KM_SLEEP); 379 380 rc = smb_odir_read(sr, od, odirent, &eos); 381 if (rc != 0) { 382 kmem_free(odirent, sizeof (smb_odirent_t)); 383 return (rc); 384 } 385 if (eos) { 386 kmem_free(odirent, sizeof (smb_odirent_t)); 387 return (ENOENT); 388 } 389 390 /* if case conflict, force mangle and use shortname */ 391 if ((od->d_flags & SMB_ODIR_FLAG_IGNORE_CASE) && 392 (odirent->od_eflags & ED_CASE_CONFLICT)) { 393 (void) smb_mangle_name(odirent->od_ino, odirent->od_name, 394 shortname, name83, 1); 395 name = shortname; 396 } else { 397 name = odirent->od_name; 398 } 399 (void) strlcpy(namebuf, name, len); 400 401 kmem_free(odirent, sizeof (smb_odirent_t)); 402 return (0); 403 } 404 405 /* 406 * smb_delete_check_dosattr 407 * 408 * Check file's dos atributes to ensure that 409 * 1. the file is not a directory - NT_STATUS_FILE_IS_A_DIRECTORY 410 * 2. the file is not readonly - NT_STATUS_CANNOT_DELETE 411 * 3. the file's dos attributes comply with the specified search attributes 412 * If the file is either hidden or system and those attributes 413 * are not specified in the search attributes - NT_STATUS_NO_SUCH_FILE 414 * 415 * Returns: 0 - file's attributes pass all checks 416 * -1 - err populated with error details 417 */ 418 static int 419 smb_delete_check_dosattr(smb_request_t *sr, smb_error_t *err) 420 { 421 smb_fqi_t *fqi; 422 smb_node_t *node; 423 smb_attr_t attr; 424 uint16_t sattr; 425 426 fqi = &sr->arg.dirop.fqi; 427 sattr = fqi->fq_sattr; 428 node = fqi->fq_fnode; 429 430 if (smb_node_getattr(sr, node, &attr) != 0) { 431 smb_delete_error(err, NT_STATUS_INTERNAL_ERROR, 432 ERRDOS, ERROR_INTERNAL_ERROR); 433 return (-1); 434 } 435 436 if (attr.sa_dosattr & FILE_ATTRIBUTE_DIRECTORY) { 437 smb_delete_error(err, NT_STATUS_FILE_IS_A_DIRECTORY, 438 ERRDOS, ERROR_ACCESS_DENIED); 439 return (-1); 440 } 441 442 if (SMB_PATHFILE_IS_READONLY(sr, node)) { 443 smb_delete_error(err, NT_STATUS_CANNOT_DELETE, 444 ERRDOS, ERROR_ACCESS_DENIED); 445 return (-1); 446 } 447 448 if ((attr.sa_dosattr & FILE_ATTRIBUTE_HIDDEN) && 449 !(SMB_SEARCH_HIDDEN(sattr))) { 450 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 451 ERRDOS, ERROR_FILE_NOT_FOUND); 452 return (-1); 453 } 454 455 if ((attr.sa_dosattr & FILE_ATTRIBUTE_SYSTEM) && 456 !(SMB_SEARCH_SYSTEM(sattr))) { 457 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 458 ERRDOS, ERROR_FILE_NOT_FOUND); 459 return (-1); 460 } 461 462 return (0); 463 } 464 465 /* 466 * smb_delete_remove_file 467 * 468 * For consistency with Windows 2000, the range check should be done 469 * after checking for sharing violations. Attempting to delete a 470 * locked file will result in sharing violation, which is the same 471 * thing that will happen if you try to delete a non-locked open file. 472 * 473 * Note that windows 2000 rejects lock requests on open files that 474 * have been opened with metadata open modes. The error is 475 * STATUS_ACCESS_DENIED. 476 * 477 * NT does not always close a file immediately, which can cause the 478 * share and access checking to fail (the node refcnt is greater 479 * than one), and the file doesn't get deleted. Breaking the oplock 480 * before share and access checking gives the client a chance to 481 * close the file. 482 * 483 * Returns: 0 - success 484 * -1 - error, err populated with error details 485 */ 486 static int 487 smb_delete_remove_file(smb_request_t *sr, smb_error_t *err) 488 { 489 int rc; 490 uint32_t status; 491 smb_fqi_t *fqi; 492 smb_node_t *node; 493 uint32_t flags = 0; 494 495 fqi = &sr->arg.dirop.fqi; 496 node = fqi->fq_fnode; 497 498 (void) smb_oplock_break(node, sr->session, B_FALSE); 499 500 smb_node_start_crit(node, RW_READER); 501 502 status = smb_node_delete_check(node); 503 if (status != NT_STATUS_SUCCESS) { 504 smb_delete_error(err, NT_STATUS_SHARING_VIOLATION, 505 ERRDOS, ERROR_SHARING_VIOLATION); 506 smb_node_end_crit(node); 507 return (-1); 508 } 509 510 status = smb_range_check(sr, node, 0, UINT64_MAX, B_TRUE); 511 if (status != NT_STATUS_SUCCESS) { 512 smb_delete_error(err, NT_STATUS_ACCESS_DENIED, 513 ERRDOS, ERROR_ACCESS_DENIED); 514 smb_node_end_crit(node); 515 return (-1); 516 } 517 518 if (SMB_TREE_SUPPORTS_CATIA(sr)) 519 flags |= SMB_CATIA; 520 521 rc = smb_fsop_remove(sr, sr->user_cr, node->n_dnode, 522 node->od_name, flags); 523 if (rc != 0) { 524 if (rc == ENOENT) 525 smb_delete_error(err, NT_STATUS_OBJECT_NAME_NOT_FOUND, 526 ERRDOS, ERROR_FILE_NOT_FOUND); 527 else 528 smbsr_map_errno(rc, err); 529 530 smb_node_end_crit(node); 531 return (-1); 532 } 533 534 smb_node_end_crit(node); 535 return (0); 536 } 537 538 539 /* 540 * smb_delete_check_path 541 * 542 * Perform initial validation on the pathname and last_comp. 543 * 544 * wildcards in path: 545 * Wildcards in the path (excluding the last_comp) should result 546 * in NT_STATUS_OBJECT_NAME_INVALID. 547 * 548 * bad path syntax: 549 * On unix .. at the root of a file system links to the root. Thus 550 * an attempt to lookup "/../../.." will be the same as looking up "/" 551 * CIFs clients expect the above to result in 552 * NT_STATUS_OBJECT_PATH_SYNTAX_BAD. It is currently not possible 553 * (and questionable if it's desirable) to deal with all cases 554 * but paths beginning with \\.. are handled. See bad_paths[]. 555 * Cases like "\\dir\\..\\.." will be caught and handled after the 556 * pnreduce. Cases like "\\dir\\..\\..\\filename" will still result 557 * in "\\filename" which is contrary to windows behavior. 558 * 559 * dot: 560 * A filename of '.' should result in NT_STATUS_OBJECT_NAME_INVALID 561 * Any wildcard filename that resolves to '.' should result in 562 * NT_STATUS_OBJECT_NAME_INVALID if the search attributes include 563 * FILE_ATTRIBUTE_DIRECTORY 564 * 565 * Returns: 566 * 0: path is valid. Sets *wildcard to TRUE if wildcard delete 567 * i.e. if wildcards in last component 568 * -1: path is invalid. Sets error information in sr. 569 */ 570 static int 571 smb_delete_check_path(smb_request_t *sr, boolean_t *wildcard) 572 { 573 smb_fqi_t *fqi = &sr->arg.dirop.fqi; 574 char *p, *last_comp; 575 int i, wildcards; 576 smb_pathname_t *pn = &fqi->fq_path; 577 578 struct { 579 char *name; 580 int len; 581 } *bad, bad_paths[] = { 582 {"\\..\0", 4}, 583 {"\\..\\", 4}, 584 {"..\0", 3}, 585 {"..\\", 3} 586 }; 587 588 /* find last component, strip trailing '\\' */ 589 p = pn->pn_path + strlen(pn->pn_path) - 1; 590 while (*p == '\\') { 591 *p = '\0'; 592 --p; 593 } 594 595 if ((p = strrchr(pn->pn_path, '\\')) == NULL) 596 last_comp = pn->pn_path; 597 else 598 last_comp = ++p; 599 600 wildcards = smb_convert_wildcards(last_comp); 601 602 if (last_comp != pn->pn_path) { 603 /* 604 * Wildcards are only allowed in the last component. 605 * Check for additional wildcards in the path. 606 */ 607 if (smb_convert_wildcards(pn->pn_path) != wildcards) { 608 smbsr_error(sr, NT_STATUS_OBJECT_NAME_INVALID, 609 ERRDOS, ERROR_INVALID_NAME); 610 return (-1); 611 } 612 } 613 614 /* path above the mount point */ 615 for (i = 0; i < sizeof (bad_paths) / sizeof (bad_paths[0]); ++i) { 616 bad = &bad_paths[i]; 617 if (strncmp(pn->pn_path, bad->name, bad->len) == 0) { 618 smbsr_error(sr, NT_STATUS_OBJECT_PATH_SYNTAX_BAD, 619 ERRDOS, ERROR_BAD_PATHNAME); 620 return (-1); 621 } 622 } 623 624 /* last component is, or resolves to, '.' (dot) */ 625 if ((strcmp(last_comp, ".") == 0) || 626 (SMB_SEARCH_DIRECTORY(fqi->fq_sattr) && 627 (smb_match(last_comp, ".")))) { 628 smbsr_error(sr, NT_STATUS_OBJECT_NAME_INVALID, 629 ERRDOS, ERROR_INVALID_NAME); 630 return (-1); 631 } 632 633 *wildcard = (wildcards != 0); 634 return (0); 635 } 636 637 /* 638 * smb_delete_error 639 */ 640 static void 641 smb_delete_error(smb_error_t *err, 642 uint32_t status, uint16_t errcls, uint16_t errcode) 643 { 644 err->severity = ERROR_SEVERITY_ERROR; 645 err->status = status; 646 err->errcls = errcls; 647 err->errcode = errcode; 648 } 649