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 *); 35 static int smb_delete_check_attr(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->srch_attr)) == 0) 102 rc = smbsr_decode_data(sr, "%S", sr, &fqi->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->path, 155 sr->tid_tree->t_snode, sr->tid_tree->t_snode, 156 &fqi->dir_snode, fqi->last_comp); 157 if (rc == 0) { 158 if (fqi->dir_snode->vp->v_type != VDIR) { 159 smb_node_release(fqi->dir_snode); 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->dir_snode == sr->tid_tree->t_snode) && 178 (strcmp(fqi->last_comp, "..") == 0)) { 179 smb_node_release(fqi->dir_snode); 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->dir_snode, 186 FILE_LIST_DIRECTORY); 187 if (rc != 0) { 188 smb_node_release(fqi->dir_snode); 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->dir_snode); 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 smb_attr_t ret_attr; 223 uint32_t status; 224 225 fqi = &sr->arg.dirop.fqi; 226 227 status = smb_validate_object_name(fqi->path, 0); 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->dir_snode, fqi->last_comp, &fqi->last_snode, &ret_attr) != 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_attr(sr, err) != 0) { 241 smb_node_release(fqi->last_snode); 242 return (-1); 243 } 244 245 if (smb_delete_remove_file(sr, err) != 0) { 246 smb_node_release(fqi->last_snode); 247 return (-1); 248 } 249 250 smb_node_release(fqi->last_snode); 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_attr 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 smb_attr_t ret_attr; 278 uint16_t odid; 279 smb_odir_t *od; 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_attr). 286 */ 287 if ((odid = smb_odir_open(sr, fqi->path, SMB_SEARCH_ATTRIBUTES)) == 0) 288 return (-1); 289 if ((od = smb_tree_lookup_odir(sr->tid_tree, odid)) == NULL) 290 return (-1); 291 292 for (;;) { 293 rc = smb_delete_find_fname(sr, od); 294 if (rc != 0) 295 break; 296 297 rc = smb_fsop_lookup_name(sr, sr->user_cr, 0, 298 sr->tid_tree->t_snode, fqi->dir_snode, 299 fqi->last_comp_od, &fqi->last_snode, &ret_attr); 300 if (rc != 0) 301 break; 302 303 if (smb_delete_check_attr(sr, err) != 0) { 304 smb_node_release(fqi->last_snode); 305 if (err->status == NT_STATUS_CANNOT_DELETE) { 306 smb_odir_release(od); 307 smb_odir_close(od); 308 return (-1); 309 } 310 if ((err->status == NT_STATUS_FILE_IS_A_DIRECTORY) && 311 (SMB_SEARCH_DIRECTORY(fqi->srch_attr) != 0)) 312 break; 313 continue; 314 } 315 316 if (smb_delete_remove_file(sr, err) == 0) { 317 ++deleted; 318 smb_node_release(fqi->last_snode); 319 continue; 320 } 321 if (err->status == NT_STATUS_OBJECT_NAME_NOT_FOUND) { 322 smb_node_release(fqi->last_snode); 323 continue; 324 } 325 326 smb_odir_release(od); 327 smb_odir_close(od); 328 smb_node_release(fqi->last_snode); 329 return (-1); 330 } 331 332 smb_odir_release(od); 333 smb_odir_close(od); 334 335 if ((rc != 0) && (rc != ENOENT)) { 336 smbsr_map_errno(rc, err); 337 return (-1); 338 } 339 340 if (deleted == 0) { 341 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 342 ERRDOS, ERROR_FILE_NOT_FOUND); 343 return (-1); 344 } 345 346 return (0); 347 } 348 349 /* 350 * smb_delete_find_fname 351 * 352 * Find next filename that matches search pattern (fqi->last_comp) 353 * and save it in fqi->last_comp_od. 354 * 355 * Case insensitivity note: 356 * If the tree is case insensitive and there's a case conflict 357 * with the name returned from smb_odir_read, smb_delete_find_fname 358 * performs case conflict name mangling to produce a unique filename. 359 * This ensures that any subsequent smb_fsop_lookup, (which will 360 * find the first case insensitive match) will find the correct file. 361 * 362 * Returns: 0 - success 363 * errno 364 */ 365 static int 366 smb_delete_find_fname(smb_request_t *sr, smb_odir_t *od) 367 { 368 int rc; 369 smb_odirent_t *odirent; 370 boolean_t eos; 371 char *name; 372 char shortname[SMB_SHORTNAMELEN]; 373 char name83[SMB_SHORTNAMELEN]; 374 smb_fqi_t *fqi; 375 376 fqi = &sr->arg.dirop.fqi; 377 odirent = kmem_alloc(sizeof (smb_odirent_t), KM_SLEEP); 378 379 rc = smb_odir_read(sr, od, odirent, &eos); 380 if (rc != 0) { 381 kmem_free(odirent, sizeof (smb_odirent_t)); 382 return (rc); 383 } 384 if (eos) { 385 kmem_free(odirent, sizeof (smb_odirent_t)); 386 return (ENOENT); 387 } 388 389 /* if case conflict, force mangle and use shortname */ 390 if ((od->d_ignore_case) && (odirent->od_eflags & ED_CASE_CONFLICT)) { 391 (void) smb_mangle_name(odirent->od_ino, odirent->od_name, 392 shortname, name83, 1); 393 name = shortname; 394 } else { 395 name = odirent->od_name; 396 } 397 (void) strlcpy(fqi->last_comp_od, name, sizeof (fqi->last_comp_od)); 398 399 kmem_free(odirent, sizeof (smb_odirent_t)); 400 return (0); 401 } 402 403 /* 404 * smb_delete_check_attr 405 * 406 * Check file's dos atributes to ensure that 407 * 1. the file is not a directory - NT_STATUS_FILE_IS_A_DIRECTORY 408 * 2. the file is not readonly - NT_STATUS_CANNOT_DELETE 409 * 3. the file's dos attributes comply with the specified search attributes 410 * If the file is either hidden or system and those attributes 411 * are not specified in the search attributes - NT_STATUS_NO_SUCH_FILE 412 * 413 * Returns: 0 - file's attributes pass all checks 414 * -1 - err populated with error details 415 */ 416 static int 417 smb_delete_check_attr(smb_request_t *sr, smb_error_t *err) 418 { 419 smb_fqi_t *fqi; 420 smb_node_t *node; 421 uint16_t dosattr, sattr; 422 423 fqi = &sr->arg.dirop.fqi; 424 sattr = fqi->srch_attr; 425 node = fqi->last_snode; 426 dosattr = smb_node_get_dosattr(node); 427 428 if (dosattr & FILE_ATTRIBUTE_DIRECTORY) { 429 smb_delete_error(err, NT_STATUS_FILE_IS_A_DIRECTORY, 430 ERRDOS, ERROR_ACCESS_DENIED); 431 return (-1); 432 } 433 434 if (SMB_PATHFILE_IS_READONLY(sr, node)) { 435 smb_delete_error(err, NT_STATUS_CANNOT_DELETE, 436 ERRDOS, ERROR_ACCESS_DENIED); 437 return (-1); 438 } 439 440 if ((dosattr & FILE_ATTRIBUTE_HIDDEN) && !(SMB_SEARCH_HIDDEN(sattr))) { 441 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 442 ERRDOS, ERROR_FILE_NOT_FOUND); 443 return (-1); 444 } 445 446 if ((dosattr & FILE_ATTRIBUTE_SYSTEM) && !(SMB_SEARCH_SYSTEM(sattr))) { 447 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 448 ERRDOS, ERROR_FILE_NOT_FOUND); 449 return (-1); 450 } 451 452 return (0); 453 } 454 455 /* 456 * smb_delete_remove_file 457 * 458 * For consistency with Windows 2000, the range check should be done 459 * after checking for sharing violations. Attempting to delete a 460 * locked file will result in sharing violation, which is the same 461 * thing that will happen if you try to delete a non-locked open file. 462 * 463 * Note that windows 2000 rejects lock requests on open files that 464 * have been opened with metadata open modes. The error is 465 * STATUS_ACCESS_DENIED. 466 * 467 * NT does not always close a file immediately, which can cause the 468 * share and access checking to fail (the node refcnt is greater 469 * than one), and the file doesn't get deleted. Breaking the oplock 470 * before share and access checking gives the client a chance to 471 * close the file. 472 * 473 * Returns: 0 - success 474 * -1 - error, err populated with error details 475 */ 476 static int 477 smb_delete_remove_file(smb_request_t *sr, smb_error_t *err) 478 { 479 int rc; 480 uint32_t status; 481 smb_fqi_t *fqi; 482 smb_node_t *node; 483 484 fqi = &sr->arg.dirop.fqi; 485 node = fqi->last_snode; 486 487 (void) smb_oplock_break(node, SMB_SESSION_GET_ID(sr->session), B_FALSE); 488 489 smb_node_start_crit(node, RW_READER); 490 491 status = smb_node_delete_check(node); 492 if (status != NT_STATUS_SUCCESS) { 493 smb_delete_error(err, NT_STATUS_SHARING_VIOLATION, 494 ERRDOS, ERROR_SHARING_VIOLATION); 495 smb_node_end_crit(node); 496 return (-1); 497 } 498 499 status = smb_range_check(sr, node, 0, UINT64_MAX, B_TRUE); 500 if (status != NT_STATUS_SUCCESS) { 501 smb_delete_error(err, NT_STATUS_ACCESS_DENIED, 502 ERRDOS, ERROR_ACCESS_DENIED); 503 smb_node_end_crit(node); 504 return (-1); 505 } 506 507 rc = smb_fsop_remove(sr, sr->user_cr, node->dir_snode, 508 node->od_name, 1); 509 if (rc != 0) { 510 if (rc == ENOENT) 511 smb_delete_error(err, NT_STATUS_OBJECT_NAME_NOT_FOUND, 512 ERRDOS, ERROR_FILE_NOT_FOUND); 513 else 514 smbsr_map_errno(rc, err); 515 516 smb_node_end_crit(node); 517 return (-1); 518 } 519 520 smb_node_end_crit(node); 521 return (0); 522 } 523 524 525 /* 526 * smb_delete_check_path 527 * 528 * Perform initial validation on the pathname and last_comp. 529 * 530 * wildcards in path: 531 * Wildcards in the path (excluding the last_comp) should result 532 * in NT_STATUS_OBJECT_NAME_INVALID. 533 * 534 * bad path syntax: 535 * On unix .. at the root of a file system links to the root. Thus 536 * an attempt to lookup "/../../.." will be the same as looking up "/" 537 * CIFs clients expect the above to result in 538 * NT_STATUS_OBJECT_PATH_SYNTAX_BAD. It is currently not possible 539 * (and questionable if it's desirable) to deal with all cases 540 * but paths beginning with \\.. are handled. See bad_paths[]. 541 * Cases like "\\dir\\..\\.." will be caught and handled after the 542 * pnreduce. Cases like "\\dir\\..\\..\\filename" will still result 543 * in "\\filename" which is contrary to windows behavior. 544 * 545 * dot: 546 * A filename of '.' should result in NT_STATUS_OBJECT_NAME_INVALID 547 * Any wildcard filename that resolves to '.' should result in 548 * NT_STATUS_OBJECT_NAME_INVALID if the search attributes include 549 * FILE_ATTRIBUTE_DIRECTORY 550 * 551 * Returns: 552 * 0: path is valid. Sets *wildcard to TRUE if wildcard delete 553 * i.e. if wildcards in last component 554 * -1: path is invalid. Sets error information in sr. 555 */ 556 static int 557 smb_delete_check_path(smb_request_t *sr, boolean_t *wildcard) 558 { 559 smb_fqi_t *fqi = &sr->arg.dirop.fqi; 560 char *p, *last_comp; 561 int i, wildcards; 562 563 struct { 564 char *name; 565 int len; 566 } *bad, bad_paths[] = { 567 {"\\..\0", 4}, 568 {"\\..\\", 4}, 569 {"..\0", 3}, 570 {"..\\", 3} 571 }; 572 573 /* find last component, strip trailing '\\' */ 574 p = fqi->path + strlen(fqi->path) - 1; 575 while (*p == '\\') { 576 *p = '\0'; 577 --p; 578 } 579 580 if ((p = strrchr(fqi->path, '\\')) == NULL) 581 last_comp = fqi->path; 582 else 583 last_comp = ++p; 584 585 wildcards = smb_convert_wildcards(last_comp); 586 587 if (last_comp != fqi->path) { 588 /* 589 * Wildcards are only allowed in the last component. 590 * Check for additional wildcards in the path. 591 */ 592 if (smb_convert_wildcards(fqi->path) != wildcards) { 593 smbsr_error(sr, NT_STATUS_OBJECT_NAME_INVALID, 594 ERRDOS, ERROR_INVALID_NAME); 595 return (-1); 596 } 597 } 598 599 /* path above the mount point */ 600 for (i = 0; i < sizeof (bad_paths) / sizeof (bad_paths[0]); ++i) { 601 bad = &bad_paths[i]; 602 if (strncmp(fqi->path, bad->name, bad->len) == 0) { 603 smbsr_error(sr, NT_STATUS_OBJECT_PATH_SYNTAX_BAD, 604 ERRDOS, ERROR_BAD_PATHNAME); 605 return (-1); 606 } 607 } 608 609 /* last component is, or resolves to, '.' (dot) */ 610 if ((strcmp(last_comp, ".") == 0) || 611 (SMB_SEARCH_DIRECTORY(fqi->srch_attr) && 612 (smb_match(last_comp, ".")))) { 613 smbsr_error(sr, NT_STATUS_OBJECT_NAME_INVALID, 614 ERRDOS, ERROR_INVALID_NAME); 615 return (-1); 616 } 617 618 *wildcard = (wildcards != 0); 619 return (0); 620 } 621 622 /* 623 * smb_delete_error 624 */ 625 static void 626 smb_delete_error(smb_error_t *err, 627 uint32_t status, uint16_t errcls, uint16_t errcode) 628 { 629 err->severity = ERROR_SEVERITY_ERROR; 630 err->status = status; 631 err->errcls = errcls; 632 err->errcode = errcode; 633 } 634