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 2008 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 *, uint32_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_name: 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 uint32_t cookie = 0; 277 smb_fqi_t *fqi; 278 smb_attr_t ret_attr; 279 280 fqi = &sr->arg.dirop.fqi; 281 282 for (;;) { 283 rc = smb_delete_find_fname(sr, &cookie); 284 if (rc != 0) 285 break; 286 287 rc = smb_fsop_lookup_name(sr, sr->user_cr, 0, 288 sr->tid_tree->t_snode, fqi->dir_snode, 289 fqi->last_comp_od, &fqi->last_snode, &ret_attr); 290 if (rc != 0) 291 break; 292 293 if (smb_delete_check_attr(sr, err) != 0) { 294 smb_node_release(fqi->last_snode); 295 if (err->status == NT_STATUS_CANNOT_DELETE) { 296 return (-1); 297 } 298 if ((err->status == NT_STATUS_FILE_IS_A_DIRECTORY) && 299 (SMB_SEARCH_DIRECTORY(fqi->srch_attr) != 0)) 300 break; 301 continue; 302 } 303 304 if (smb_delete_remove_file(sr, err) == 0) { 305 ++deleted; 306 smb_node_release(fqi->last_snode); 307 continue; 308 } 309 if (err->status == NT_STATUS_OBJECT_NAME_NOT_FOUND) { 310 smb_node_release(fqi->last_snode); 311 continue; 312 } 313 314 smb_node_release(fqi->last_snode); 315 return (-1); 316 } 317 318 319 if ((rc != 0) && (rc != ENOENT)) { 320 smbsr_map_errno(rc, err); 321 return (-1); 322 } 323 324 if (deleted == 0) { 325 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 326 ERRDOS, ERROR_FILE_NOT_FOUND); 327 return (-1); 328 } 329 330 return (0); 331 } 332 333 /* 334 * smb_delete_find_fname 335 * 336 * Find next filename that matches search pattern (fqi->last_comp) 337 * and save it in fqi->last_comp_od. 338 * 339 * Returns: 0 - success 340 * errno 341 */ 342 static int 343 smb_delete_find_fname(smb_request_t *sr, uint32_t *cookie) 344 { 345 int rc, n_name; 346 ino64_t fileid; 347 smb_fqi_t *fqi; 348 char name83[SMB_SHORTNAMELEN]; 349 char shortname[SMB_SHORTNAMELEN]; 350 boolean_t ignore_case; 351 352 fqi = &sr->arg.dirop.fqi; 353 354 ignore_case = SMB_TREE_IS_CASEINSENSITIVE(sr); 355 356 for (;;) { 357 n_name = sizeof (fqi->last_comp_od) - 1; 358 359 rc = smb_fsop_readdir(sr, sr->user_cr, fqi->dir_snode, cookie, 360 fqi->last_comp_od, &n_name, &fileid, NULL, NULL, NULL); 361 362 if (rc != 0) 363 return (rc); 364 365 /* check for EOF */ 366 if (n_name == 0) 367 return (ENOENT); 368 369 fqi->last_comp_od[n_name] = '\0'; 370 371 if (smb_match_name(fileid, fqi->last_comp_od, shortname, name83, 372 fqi->last_comp, ignore_case)) 373 return (0); 374 } 375 } 376 377 /* 378 * smb_delete_check_attr 379 * 380 * Check file's dos atributes to ensure that 381 * 1. the file is not a directory - NT_STATUS_FILE_IS_A_DIRECTORY 382 * 2. the file is not readonly - NT_STATUS_CANNOT_DELETE 383 * 3. the file's dos attributes comply with the specified search attributes 384 * If the file is either hidden or system and those attributes 385 * are not specified in the search attributes - NT_STATUS_NO_SUCH_FILE 386 * 387 * Returns: 0 - file's attributes pass all checks 388 * -1 - err populated with error details 389 */ 390 static int 391 smb_delete_check_attr(smb_request_t *sr, smb_error_t *err) 392 { 393 smb_fqi_t *fqi; 394 smb_node_t *node; 395 uint16_t dosattr, sattr; 396 397 fqi = &sr->arg.dirop.fqi; 398 sattr = fqi->srch_attr; 399 node = fqi->last_snode; 400 dosattr = smb_node_get_dosattr(node); 401 402 if (dosattr & FILE_ATTRIBUTE_DIRECTORY) { 403 smb_delete_error(err, NT_STATUS_FILE_IS_A_DIRECTORY, 404 ERRDOS, ERROR_ACCESS_DENIED); 405 return (-1); 406 } 407 408 if (SMB_PATHFILE_IS_READONLY(sr, node)) { 409 smb_delete_error(err, NT_STATUS_CANNOT_DELETE, 410 ERRDOS, ERROR_ACCESS_DENIED); 411 return (-1); 412 } 413 414 if ((dosattr & FILE_ATTRIBUTE_HIDDEN) && !(SMB_SEARCH_HIDDEN(sattr))) { 415 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 416 ERRDOS, ERROR_FILE_NOT_FOUND); 417 return (-1); 418 } 419 420 if ((dosattr & FILE_ATTRIBUTE_SYSTEM) && !(SMB_SEARCH_SYSTEM(sattr))) { 421 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 422 ERRDOS, ERROR_FILE_NOT_FOUND); 423 return (-1); 424 } 425 426 return (0); 427 } 428 429 /* 430 * smb_delete_remove_file 431 * 432 * For consistency with Windows 2000, the range check should be done 433 * after checking for sharing violations. Attempting to delete a 434 * locked file will result in sharing violation, which is the same 435 * thing that will happen if you try to delete a non-locked open file. 436 * 437 * Note that windows 2000 rejects lock requests on open files that 438 * have been opened with metadata open modes. The error is 439 * STATUS_ACCESS_DENIED. 440 * 441 * NT does not always close a file immediately, which can cause the 442 * share and access checking to fail (the node refcnt is greater 443 * than one), and the file doesn't get deleted. Breaking the oplock 444 * before share and access checking gives the client a chance to 445 * close the file. 446 * 447 * Returns: 0 - success 448 * -1 - error, err populated with error details 449 */ 450 static int 451 smb_delete_remove_file(smb_request_t *sr, smb_error_t *err) 452 { 453 int rc; 454 uint32_t status; 455 smb_fqi_t *fqi; 456 smb_node_t *node; 457 458 fqi = &sr->arg.dirop.fqi; 459 node = fqi->last_snode; 460 461 smb_oplock_break(node); 462 463 smb_node_start_crit(node, RW_READER); 464 465 status = smb_node_delete_check(node); 466 if (status != NT_STATUS_SUCCESS) { 467 smb_delete_error(err, NT_STATUS_SHARING_VIOLATION, 468 ERRDOS, ERROR_SHARING_VIOLATION); 469 smb_node_end_crit(node); 470 return (-1); 471 } 472 473 status = smb_range_check(sr, node, 0, UINT64_MAX, B_TRUE); 474 if (status != NT_STATUS_SUCCESS) { 475 smb_delete_error(err, NT_STATUS_ACCESS_DENIED, 476 ERRDOS, ERROR_ACCESS_DENIED); 477 smb_node_end_crit(node); 478 return (-1); 479 } 480 481 rc = smb_fsop_remove(sr, sr->user_cr, node->dir_snode, 482 node->od_name, 1); 483 if (rc != 0) { 484 if (rc == ENOENT) 485 smb_delete_error(err, NT_STATUS_OBJECT_NAME_NOT_FOUND, 486 ERRDOS, ERROR_FILE_NOT_FOUND); 487 else 488 smbsr_map_errno(rc, err); 489 490 smb_node_end_crit(node); 491 return (-1); 492 } 493 494 smb_node_end_crit(node); 495 return (0); 496 } 497 498 499 /* 500 * smb_delete_check_path 501 * 502 * Perform initial validation on the pathname and last_comp. 503 * 504 * wildcards in path: 505 * Wildcards in the path (excluding the last_comp) should result 506 * in NT_STATUS_OBJECT_NAME_INVALID. 507 * 508 * bad path syntax: 509 * On unix .. at the root of a file system links to the root. Thus 510 * an attempt to lookup "/../../.." will be the same as looking up "/" 511 * CIFs clients expect the above to result in 512 * NT_STATUS_OBJECT_PATH_SYNTAX_BAD. It is currently not possible 513 * (and questionable if it's desirable) to deal with all cases 514 * but paths beginning with \\.. are handled. See bad_paths[]. 515 * Cases like "\\dir\\..\\.." will be caught and handled after the 516 * pnreduce. Cases like "\\dir\\..\\..\\filename" will still result 517 * in "\\filename" which is contrary to windows behavior. 518 * 519 * dot: 520 * A filename of '.' should result in NT_STATUS_OBJECT_NAME_INVALID 521 * Any wildcard filename that resolves to '.' should result in 522 * NT_STATUS_OBJECT_NAME_INVALID if the search attributes include 523 * FILE_ATTRIBUTE_DIRECTORY 524 * 525 * Returns: 526 * 0: path is valid. Sets *wildcard to TRUE if wildcard delete 527 * i.e. if wildcards in last component 528 * -1: path is invalid. Sets error information in sr. 529 */ 530 static int 531 smb_delete_check_path(smb_request_t *sr, boolean_t *wildcard) 532 { 533 smb_fqi_t *fqi = &sr->arg.dirop.fqi; 534 char *p, *last_comp; 535 int i, wildcards; 536 537 struct { 538 char *name; 539 int len; 540 } *bad, bad_paths[] = { 541 {"\\..\0", 4}, 542 {"\\..\\", 4}, 543 {"..\0", 3}, 544 {"..\\", 3} 545 }; 546 547 /* check for wildcards in path */ 548 wildcards = smb_convert_unicode_wildcards(fqi->path); 549 550 /* find last component, strip trailing '\\' */ 551 p = fqi->path + strlen(fqi->path) - 1; 552 while (*p == '\\') { 553 *p = '\0'; 554 --p; 555 } 556 if ((p = strrchr(fqi->path, '\\')) == NULL) { 557 last_comp = fqi->path; 558 } else { 559 last_comp = ++p; 560 561 /* wildcards in path > wildcards in last_comp */ 562 if (smb_convert_unicode_wildcards(last_comp) != wildcards) { 563 smbsr_error(sr, NT_STATUS_OBJECT_NAME_INVALID, 564 ERRDOS, ERROR_INVALID_NAME); 565 return (-1); 566 } 567 } 568 569 /* path above the mount point */ 570 for (i = 0; i < sizeof (bad_paths) / sizeof (bad_paths[0]); ++i) { 571 bad = &bad_paths[i]; 572 if (strncmp(fqi->path, bad->name, bad->len) == 0) { 573 smbsr_error(sr, NT_STATUS_OBJECT_PATH_SYNTAX_BAD, 574 ERRDOS, ERROR_BAD_PATHNAME); 575 return (-1); 576 } 577 } 578 579 /* last component is, or resolves to, '.' (dot) */ 580 if ((strcmp(last_comp, ".") == 0) || 581 (SMB_SEARCH_DIRECTORY(fqi->srch_attr) && 582 (smb_match(last_comp, ".")))) { 583 smbsr_error(sr, NT_STATUS_OBJECT_NAME_INVALID, 584 ERRDOS, ERROR_INVALID_NAME); 585 return (-1); 586 } 587 588 *wildcard = (wildcards != 0); 589 return (0); 590 } 591 592 /* 593 * smb_delete_error 594 */ 595 static void 596 smb_delete_error(smb_error_t *err, 597 uint32_t status, uint16_t errcls, uint16_t errcode) 598 { 599 err->severity = ERROR_SEVERITY_ERROR; 600 err->status = status; 601 err->errcls = errcls; 602 err->errcode = errcode; 603 } 604