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; 223 224 fqi = &sr->arg.dirop.fqi; 225 226 if (smb_fsop_lookup_name(sr, sr->user_cr, 0, sr->tid_tree->t_snode, 227 fqi->dir_snode, fqi->last_comp, &fqi->last_snode, &ret_attr) != 0) { 228 smb_delete_error(err, NT_STATUS_OBJECT_NAME_NOT_FOUND, 229 ERRDOS, ERROR_FILE_NOT_FOUND); 230 return (-1); 231 } 232 233 if (smb_delete_check_attr(sr, err) != 0) { 234 smb_node_release(fqi->last_snode); 235 return (-1); 236 } 237 238 if (smb_delete_remove_file(sr, err) != 0) { 239 smb_node_release(fqi->last_snode); 240 return (-1); 241 } 242 243 smb_node_release(fqi->last_snode); 244 return (0); 245 } 246 247 /* 248 * smb_delete_multiple_files 249 * 250 * For each matching file found by smb_delete_find_name: 251 * 1. lookup file 252 * 2. check the file's attributes 253 * - The search ends with an error if a readonly file 254 * (NT_STATUS_CANNOT_DELETE) is matched. 255 * - The search ends (but not an error) if a directory is 256 * matched and the request's search did not include 257 * directories. 258 * - Otherwise, if smb_delete_check_attr fails the file 259 * is skipped and the search continues (at step 1) 260 * 3. delete the file 261 * 262 * Returns 0 - success 263 * -1 - error, err is populated with error details 264 */ 265 static int 266 smb_delete_multiple_files(smb_request_t *sr, smb_error_t *err) 267 { 268 int rc, deleted = 0; 269 uint32_t cookie = 0; 270 smb_fqi_t *fqi; 271 smb_attr_t ret_attr; 272 273 fqi = &sr->arg.dirop.fqi; 274 275 for (;;) { 276 rc = smb_delete_find_fname(sr, &cookie); 277 if (rc != 0) 278 break; 279 280 rc = smb_fsop_lookup_name(sr, sr->user_cr, 0, 281 sr->tid_tree->t_snode, fqi->dir_snode, 282 fqi->last_comp_od, &fqi->last_snode, &ret_attr); 283 if (rc != 0) 284 break; 285 286 if (smb_delete_check_attr(sr, err) != 0) { 287 smb_node_release(fqi->last_snode); 288 if (err->status == NT_STATUS_CANNOT_DELETE) { 289 return (-1); 290 } 291 if ((err->status == NT_STATUS_FILE_IS_A_DIRECTORY) && 292 (SMB_SEARCH_DIRECTORY(fqi->srch_attr) != 0)) 293 break; 294 continue; 295 } 296 297 if (smb_delete_remove_file(sr, err) == 0) { 298 ++deleted; 299 smb_node_release(fqi->last_snode); 300 continue; 301 } 302 if (err->status == NT_STATUS_OBJECT_NAME_NOT_FOUND) { 303 smb_node_release(fqi->last_snode); 304 continue; 305 } 306 307 smb_node_release(fqi->last_snode); 308 return (-1); 309 } 310 311 312 if ((rc != 0) && (rc != ENOENT)) { 313 smbsr_map_errno(rc, err); 314 return (-1); 315 } 316 317 if (deleted == 0) { 318 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 319 ERRDOS, ERROR_FILE_NOT_FOUND); 320 return (-1); 321 } 322 323 return (0); 324 } 325 326 /* 327 * smb_delete_find_fname 328 * 329 * Find next filename that matches search pattern (fqi->last_comp) 330 * and save it in fqi->last_comp_od. 331 * 332 * Returns: 0 - success 333 * errno 334 */ 335 static int 336 smb_delete_find_fname(smb_request_t *sr, uint32_t *cookie) 337 { 338 int rc, n_name; 339 ino64_t fileid; 340 smb_fqi_t *fqi; 341 char name83[SMB_SHORTNAMELEN]; 342 char shortname[SMB_SHORTNAMELEN]; 343 boolean_t ignore_case; 344 345 fqi = &sr->arg.dirop.fqi; 346 347 ignore_case = SMB_TREE_IS_CASEINSENSITIVE(sr); 348 349 for (;;) { 350 n_name = sizeof (fqi->last_comp_od) - 1; 351 352 rc = smb_fsop_readdir(sr, sr->user_cr, fqi->dir_snode, cookie, 353 fqi->last_comp_od, &n_name, &fileid, NULL, NULL, NULL); 354 355 if (rc != 0) 356 return (rc); 357 358 /* check for EOF */ 359 if (n_name == 0) 360 return (ENOENT); 361 362 fqi->last_comp_od[n_name] = '\0'; 363 364 if (smb_match_name(fileid, fqi->last_comp_od, shortname, name83, 365 fqi->last_comp, ignore_case)) 366 return (0); 367 } 368 } 369 370 /* 371 * smb_delete_check_attr 372 * 373 * Check file's dos atributes to ensure that 374 * 1. the file is not a directory - NT_STATUS_FILE_IS_A_DIRECTORY 375 * 2. the file is not readonly - NT_STATUS_CANNOT_DELETE 376 * 3. the file's dos attributes comply with the specified search attributes 377 * If the file is either hidden or system and those attributes 378 * are not specified in the search attributes - NT_STATUS_NO_SUCH_FILE 379 * 380 * Returns: 0 - file's attributes pass all checks 381 * -1 - err populated with error details 382 */ 383 static int 384 smb_delete_check_attr(smb_request_t *sr, smb_error_t *err) 385 { 386 smb_fqi_t *fqi; 387 smb_node_t *node; 388 uint16_t dosattr, sattr; 389 390 fqi = &sr->arg.dirop.fqi; 391 sattr = fqi->srch_attr; 392 node = fqi->last_snode; 393 dosattr = smb_node_get_dosattr(node); 394 395 if (dosattr & FILE_ATTRIBUTE_DIRECTORY) { 396 smb_delete_error(err, NT_STATUS_FILE_IS_A_DIRECTORY, 397 ERRDOS, ERROR_ACCESS_DENIED); 398 return (-1); 399 } 400 401 if (SMB_PATHFILE_IS_READONLY(sr, node)) { 402 smb_delete_error(err, NT_STATUS_CANNOT_DELETE, 403 ERRDOS, ERROR_ACCESS_DENIED); 404 return (-1); 405 } 406 407 if ((dosattr & FILE_ATTRIBUTE_HIDDEN) && !(SMB_SEARCH_HIDDEN(sattr))) { 408 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 409 ERRDOS, ERROR_FILE_NOT_FOUND); 410 return (-1); 411 } 412 413 if ((dosattr & FILE_ATTRIBUTE_SYSTEM) && !(SMB_SEARCH_SYSTEM(sattr))) { 414 smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, 415 ERRDOS, ERROR_FILE_NOT_FOUND); 416 return (-1); 417 } 418 419 return (0); 420 } 421 422 /* 423 * smb_delete_remove_file 424 * 425 * For consistency with Windows 2000, the range check should be done 426 * after checking for sharing violations. Attempting to delete a 427 * locked file will result in sharing violation, which is the same 428 * thing that will happen if you try to delete a non-locked open file. 429 * 430 * Note that windows 2000 rejects lock requests on open files that 431 * have been opened with metadata open modes. The error is 432 * STATUS_ACCESS_DENIED. 433 * 434 * NT does not always close a file immediately, which can cause the 435 * share and access checking to fail (the node refcnt is greater 436 * than one), and the file doesn't get deleted. Breaking the oplock 437 * before share and access checking gives the client a chance to 438 * close the file. 439 * 440 * Returns: 0 - success 441 * -1 - error, err populated with error details 442 */ 443 static int 444 smb_delete_remove_file(smb_request_t *sr, smb_error_t *err) 445 { 446 int rc; 447 uint32_t status; 448 smb_fqi_t *fqi; 449 smb_node_t *node; 450 451 fqi = &sr->arg.dirop.fqi; 452 node = fqi->last_snode; 453 454 smb_oplock_break(node); 455 456 smb_node_start_crit(node, RW_READER); 457 458 status = smb_node_delete_check(node); 459 if (status != NT_STATUS_SUCCESS) { 460 smb_delete_error(err, NT_STATUS_SHARING_VIOLATION, 461 ERRDOS, ERROR_SHARING_VIOLATION); 462 smb_node_end_crit(node); 463 return (-1); 464 } 465 466 status = smb_range_check(sr, node, 0, UINT64_MAX, B_TRUE); 467 if (status != NT_STATUS_SUCCESS) { 468 smb_delete_error(err, NT_STATUS_ACCESS_DENIED, 469 ERRDOS, ERROR_ACCESS_DENIED); 470 smb_node_end_crit(node); 471 return (-1); 472 } 473 474 rc = smb_fsop_remove(sr, sr->user_cr, node->dir_snode, 475 node->od_name, 1); 476 if (rc != 0) { 477 if (rc == ENOENT) 478 smb_delete_error(err, NT_STATUS_OBJECT_NAME_NOT_FOUND, 479 ERRDOS, ERROR_FILE_NOT_FOUND); 480 else 481 smbsr_map_errno(rc, err); 482 483 smb_node_end_crit(node); 484 return (-1); 485 } 486 487 smb_node_end_crit(node); 488 return (0); 489 } 490 491 492 /* 493 * smb_delete_check_path 494 * 495 * Perform initial validation on the pathname and last_comp. 496 * 497 * wildcards in path: 498 * Wildcards in the path (excluding the last_comp) should result 499 * in NT_STATUS_OBJECT_NAME_INVALID. 500 * 501 * bad path syntax: 502 * On unix .. at the root of a file system links to the root. Thus 503 * an attempt to lookup "/../../.." will be the same as looking up "/" 504 * CIFs clients expect the above to result in 505 * NT_STATUS_OBJECT_PATH_SYNTAX_BAD. It is currently not possible 506 * (and questionable if it's desirable) to deal with all cases 507 * but paths beginning with \\.. are handled. See bad_paths[]. 508 * Cases like "\\dir\\..\\.." will be caught and handled after the 509 * pnreduce. Cases like "\\dir\\..\\..\\filename" will still result 510 * in "\\filename" which is contrary to windows behavior. 511 * 512 * dot: 513 * A filename of '.' should result in NT_STATUS_OBJECT_NAME_INVALID 514 * Any wildcard filename that resolves to '.' should result in 515 * NT_STATUS_OBJECT_NAME_INVALID if the search attributes include 516 * FILE_ATTRIBUTE_DIRECTORY 517 * 518 * Returns: 519 * 0: path is valid. Sets *wildcard to TRUE if wildcard delete 520 * i.e. if wildcards in last component 521 * -1: path is invalid. Sets error information in sr. 522 */ 523 static int 524 smb_delete_check_path(smb_request_t *sr, boolean_t *wildcard) 525 { 526 smb_fqi_t *fqi = &sr->arg.dirop.fqi; 527 char *p, *last_comp; 528 int i, wildcards; 529 530 struct { 531 char *name; 532 int len; 533 } *bad, bad_paths[] = { 534 {"\\..\0", 4}, 535 {"\\..\\", 4}, 536 {"..\0", 3}, 537 {"..\\", 3} 538 }; 539 540 /* check for wildcards in path */ 541 wildcards = smb_convert_unicode_wildcards(fqi->path); 542 543 /* find last component, strip trailing '\\' */ 544 p = fqi->path + strlen(fqi->path) - 1; 545 while (*p == '\\') { 546 *p = '\0'; 547 --p; 548 } 549 if ((p = strrchr(fqi->path, '\\')) == NULL) { 550 last_comp = fqi->path; 551 } else { 552 last_comp = ++p; 553 554 /* wildcards in path > wildcards in last_comp */ 555 if (smb_convert_unicode_wildcards(last_comp) != wildcards) { 556 smbsr_error(sr, NT_STATUS_OBJECT_NAME_INVALID, 557 ERRDOS, ERROR_INVALID_NAME); 558 return (-1); 559 } 560 } 561 562 /* path above the mount point */ 563 for (i = 0; i < sizeof (bad_paths) / sizeof (bad_paths[0]); ++i) { 564 bad = &bad_paths[i]; 565 if (strncmp(fqi->path, bad->name, bad->len) == 0) { 566 smbsr_error(sr, NT_STATUS_OBJECT_PATH_SYNTAX_BAD, 567 ERRDOS, ERROR_BAD_PATHNAME); 568 return (-1); 569 } 570 } 571 572 /* last component is, or resolves to, '.' (dot) */ 573 if ((strcmp(last_comp, ".") == 0) || 574 (SMB_SEARCH_DIRECTORY(fqi->srch_attr) && 575 (smb_match(last_comp, ".")))) { 576 smbsr_error(sr, NT_STATUS_OBJECT_NAME_INVALID, 577 ERRDOS, ERROR_INVALID_NAME); 578 return (-1); 579 } 580 581 *wildcard = (wildcards != 0); 582 return (0); 583 } 584 585 /* 586 * smb_delete_error 587 */ 588 static void 589 smb_delete_error(smb_error_t *err, 590 uint32_t status, uint16_t errcls, uint16_t errcode) 591 { 592 err->severity = ERROR_SEVERITY_ERROR; 593 err->status = status; 594 err->errcls = errcls; 595 err->errcode = errcode; 596 } 597