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 /* 23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright 2020 Tintri by DDN, Inc. All rights reserved. 25 */ 26 27 /* 28 * This module provides the common open functionality to the various 29 * open and create SMB interface functions. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/cmn_err.h> 34 #include <sys/fcntl.h> 35 #include <sys/nbmlock.h> 36 #include <smbsrv/string.h> 37 #include <smbsrv/smb2_kproto.h> 38 #include <smbsrv/smb_fsops.h> 39 #include <smbsrv/smbinfo.h> 40 41 int smb_session_ofile_max = 32768; 42 43 extern uint32_t smb_is_executable(char *); 44 static void smb_delete_new_object(smb_request_t *); 45 static int smb_set_open_attributes(smb_request_t *, smb_ofile_t *); 46 47 /* 48 * smb_access_generic_to_file 49 * 50 * Search MSDN for IoCreateFile to see following mapping. 51 * 52 * GENERIC_READ STANDARD_RIGHTS_READ, FILE_READ_DATA, 53 * FILE_READ_ATTRIBUTES and FILE_READ_EA 54 * 55 * GENERIC_WRITE STANDARD_RIGHTS_WRITE, FILE_WRITE_DATA, 56 * FILE_WRITE_ATTRIBUTES, FILE_WRITE_EA, and FILE_APPEND_DATA 57 * 58 * GENERIC_EXECUTE STANDARD_RIGHTS_EXECUTE, SYNCHRONIZE, and FILE_EXECUTE. 59 */ 60 static uint32_t 61 smb_access_generic_to_file(uint32_t desired_access) 62 { 63 uint32_t access = 0; 64 65 if (desired_access & GENERIC_ALL) 66 return (FILE_ALL_ACCESS & ~SYNCHRONIZE); 67 68 if (desired_access & GENERIC_EXECUTE) { 69 desired_access &= ~GENERIC_EXECUTE; 70 access |= (STANDARD_RIGHTS_EXECUTE | 71 SYNCHRONIZE | FILE_EXECUTE); 72 } 73 74 if (desired_access & GENERIC_WRITE) { 75 desired_access &= ~GENERIC_WRITE; 76 access |= (FILE_GENERIC_WRITE & ~SYNCHRONIZE); 77 } 78 79 if (desired_access & GENERIC_READ) { 80 desired_access &= ~GENERIC_READ; 81 access |= FILE_GENERIC_READ; 82 } 83 84 return (access | desired_access); 85 } 86 87 /* 88 * smb_omode_to_amask 89 * 90 * This function converts open modes used by Open and Open AndX 91 * commands to desired access bits used by NT Create AndX command. 92 */ 93 uint32_t 94 smb_omode_to_amask(uint32_t desired_access) 95 { 96 switch (desired_access & SMB_DA_ACCESS_MASK) { 97 case SMB_DA_ACCESS_READ: 98 return (FILE_GENERIC_READ); 99 100 case SMB_DA_ACCESS_WRITE: 101 return (FILE_GENERIC_WRITE); 102 103 case SMB_DA_ACCESS_READ_WRITE: 104 return (FILE_GENERIC_READ | FILE_GENERIC_WRITE); 105 106 case SMB_DA_ACCESS_EXECUTE: 107 return (FILE_GENERIC_READ | FILE_GENERIC_EXECUTE); 108 109 default: 110 return (FILE_GENERIC_ALL); 111 } 112 } 113 114 /* 115 * smb_denymode_to_sharemode 116 * 117 * This function converts deny modes used by Open and Open AndX 118 * commands to share access bits used by NT Create AndX command. 119 */ 120 uint32_t 121 smb_denymode_to_sharemode(uint32_t desired_access, char *fname) 122 { 123 switch (desired_access & SMB_DA_SHARE_MASK) { 124 case SMB_DA_SHARE_COMPATIBILITY: 125 if (smb_is_executable(fname)) 126 return (FILE_SHARE_READ | FILE_SHARE_WRITE); 127 128 return (FILE_SHARE_ALL); 129 130 case SMB_DA_SHARE_EXCLUSIVE: 131 return (FILE_SHARE_NONE); 132 133 case SMB_DA_SHARE_DENY_WRITE: 134 return (FILE_SHARE_READ); 135 136 case SMB_DA_SHARE_DENY_READ: 137 return (FILE_SHARE_WRITE); 138 139 case SMB_DA_SHARE_DENY_NONE: 140 default: 141 return (FILE_SHARE_READ | FILE_SHARE_WRITE); 142 } 143 } 144 145 /* 146 * smb_ofun_to_crdisposition 147 * 148 * This function converts open function values used by Open and Open AndX 149 * commands to create disposition values used by NT Create AndX command. 150 */ 151 uint32_t 152 smb_ofun_to_crdisposition(uint16_t ofun) 153 { 154 static int ofun_cr_map[3][2] = 155 { 156 { -1, FILE_CREATE }, 157 { FILE_OPEN, FILE_OPEN_IF }, 158 { FILE_OVERWRITE, FILE_OVERWRITE_IF } 159 }; 160 161 int row = ofun & SMB_OFUN_OPEN_MASK; 162 int col = (ofun & SMB_OFUN_CREATE_MASK) >> 4; 163 164 if (row == 3) 165 return (FILE_MAXIMUM_DISPOSITION + 1); 166 167 return (ofun_cr_map[row][col]); 168 } 169 170 /* 171 * smb_common_open 172 * 173 * Notes on write-through behaviour. It looks like pre-LM0.12 versions 174 * of the protocol specify the write-through mode when a file is opened, 175 * (SmbOpen, SmbOpenAndX) so the write calls (SmbWrite, SmbWriteAndClose, 176 * SmbWriteAndUnlock) don't need to contain a write-through flag. 177 * 178 * With LM0.12, the open calls (SmbCreateAndX, SmbNtTransactCreate) 179 * don't indicate which write-through mode to use. Instead the write 180 * calls (SmbWriteAndX, SmbWriteRaw) specify the mode on a per call 181 * basis. 182 * 183 * We don't care which open call was used to get us here, we just need 184 * to ensure that the write-through mode flag is copied from the open 185 * parameters to the node. We test the omode write-through flag in all 186 * write functions. 187 * 188 * This function returns NT status codes. 189 * 190 * The following rules apply when processing a file open request: 191 * 192 * - Oplocks must be broken prior to share checking as the break may 193 * cause other clients to close the file, which would affect sharing 194 * checks. 195 * 196 * - Share checks must take place prior to access checks for correct 197 * Windows semantics and to prevent unnecessary NFS delegation recalls. 198 * 199 * - Oplocks must be acquired after open to ensure the correct 200 * synchronization with NFS delegation and FEM installation. 201 * 202 * DOS readonly bit rules 203 * 204 * 1. The creator of a readonly file can write to/modify the size of the file 205 * using the original create fid, even though the file will appear as readonly 206 * to all other fids and via a CIFS getattr call. 207 * 208 * 2. A setinfo operation (using either an open fid or a path) to set/unset 209 * readonly will be successful regardless of whether a creator of a readonly 210 * file has an open fid. 211 * 212 * 3. The DOS readonly bit affects only data and some metadata. 213 * The following metadata can be changed regardless of the readonly bit: 214 * - security descriptors 215 * - DOS attributes 216 * - timestamps 217 * 218 * In the current implementation, the file size cannot be changed (except for 219 * the exceptions in #1 and #2, above). 220 * 221 * 222 * DOS attribute rules 223 * 224 * These rules are specific to creating / opening files and directories. 225 * How the attribute value (specifically ZERO or FILE_ATTRIBUTE_NORMAL) 226 * should be interpreted may differ in other requests. 227 * 228 * - An attribute value equal to ZERO or FILE_ATTRIBUTE_NORMAL means that the 229 * file's attributes should be cleared. 230 * - If FILE_ATTRIBUTE_NORMAL is specified with any other attributes, 231 * FILE_ATTRIBUTE_NORMAL is ignored. 232 * 233 * 1. Creating a new file 234 * - The request attributes + FILE_ATTRIBUTE_ARCHIVE are applied to the file. 235 * 236 * 2. Creating a new directory 237 * - The request attributes + FILE_ATTRIBUTE_DIRECTORY are applied to the file. 238 * - FILE_ATTRIBUTE_ARCHIVE does not get set. 239 * 240 * 3. Overwriting an existing file 241 * - the request attributes are used as search attributes. If the existing 242 * file does not meet the search criteria access is denied. 243 * - otherwise, applies attributes + FILE_ATTRIBUTE_ARCHIVE. 244 * 245 * 4. Opening an existing file or directory 246 * The request attributes are ignored. 247 */ 248 uint32_t 249 smb_common_open(smb_request_t *sr) 250 { 251 smb_server_t *sv = sr->sr_server; 252 smb_tree_t *tree = sr->tid_tree; 253 smb_node_t *fnode = NULL; 254 smb_node_t *dnode = NULL; 255 smb_node_t *cur_node = NULL; 256 smb_node_t *tmp_node = NULL; 257 smb_arg_open_t *op = &sr->sr_open; 258 smb_pathname_t *pn = &op->fqi.fq_path; 259 smb_ofile_t *of = NULL; 260 smb_attr_t new_attr; 261 hrtime_t shrlock_t0; 262 int max_requested = 0; 263 uint32_t max_allowed; 264 uint32_t status = NT_STATUS_SUCCESS; 265 int is_dir; 266 int rc; 267 boolean_t is_stream = B_FALSE; 268 int lookup_flags = SMB_FOLLOW_LINKS; 269 uint32_t uniq_fid = 0; 270 uint16_t tree_fid = 0; 271 boolean_t created = B_FALSE; 272 boolean_t last_comp_found = B_FALSE; 273 boolean_t stream_found = B_FALSE; 274 boolean_t opening_incr = B_FALSE; 275 boolean_t dnode_held = B_FALSE; 276 boolean_t dnode_wlock = B_FALSE; 277 boolean_t fnode_held = B_FALSE; 278 boolean_t fnode_wlock = B_FALSE; 279 boolean_t fnode_shrlk = B_FALSE; 280 boolean_t did_open = B_FALSE; 281 boolean_t did_break_handle = B_FALSE; 282 boolean_t did_cleanup_orphans = B_FALSE; 283 char *sname = NULL; 284 285 /* Get out now if we've been cancelled. */ 286 mutex_enter(&sr->sr_mutex); 287 if (sr->sr_state != SMB_REQ_STATE_ACTIVE) { 288 mutex_exit(&sr->sr_mutex); 289 return (NT_STATUS_CANCELLED); 290 } 291 mutex_exit(&sr->sr_mutex); 292 293 is_dir = (op->create_options & FILE_DIRECTORY_FILE) ? 1 : 0; 294 295 /* 296 * If the object being created or opened is a directory 297 * the Disposition parameter must be one of FILE_CREATE, 298 * FILE_OPEN, or FILE_OPEN_IF 299 */ 300 if (is_dir) { 301 if ((op->create_disposition != FILE_CREATE) && 302 (op->create_disposition != FILE_OPEN_IF) && 303 (op->create_disposition != FILE_OPEN)) { 304 return (NT_STATUS_INVALID_PARAMETER); 305 } 306 } 307 308 if (op->desired_access & MAXIMUM_ALLOWED) { 309 max_requested = 1; 310 op->desired_access &= ~MAXIMUM_ALLOWED; 311 } 312 op->desired_access = smb_access_generic_to_file(op->desired_access); 313 314 if (sr->session->s_file_cnt >= smb_session_ofile_max) { 315 ASSERT(sr->uid_user); 316 cmn_err(CE_NOTE, "smbsrv[%s\\%s]: TOO_MANY_OPENED_FILES", 317 sr->uid_user->u_domain, sr->uid_user->u_name); 318 return (NT_STATUS_TOO_MANY_OPENED_FILES); 319 } 320 321 if (smb_idpool_alloc(&tree->t_fid_pool, &tree_fid)) 322 return (NT_STATUS_TOO_MANY_OPENED_FILES); 323 324 /* This must be NULL at this point */ 325 sr->fid_ofile = NULL; 326 327 op->devstate = 0; 328 329 switch (sr->tid_tree->t_res_type & STYPE_MASK) { 330 case STYPE_DISKTREE: 331 case STYPE_PRINTQ: 332 break; 333 334 case STYPE_IPC: 335 /* 336 * Security descriptors for pipes are not implemented, 337 * so just setup a reasonable access mask. 338 */ 339 op->desired_access = (READ_CONTROL | SYNCHRONIZE | 340 FILE_READ_DATA | FILE_READ_ATTRIBUTES | 341 FILE_WRITE_DATA | FILE_APPEND_DATA); 342 343 /* 344 * Limit the number of open pipe instances. 345 */ 346 if ((rc = smb_threshold_enter(&sv->sv_opipe_ct)) != 0) { 347 status = RPC_NT_SERVER_TOO_BUSY; 348 goto errout; 349 } 350 351 /* 352 * Most of IPC open is handled in smb_opipe_open() 353 */ 354 op->create_options = 0; 355 of = smb_ofile_alloc(sr, op, NULL, SMB_FTYPE_MESG_PIPE, 356 tree_fid); 357 tree_fid = 0; // given to the ofile 358 status = smb_opipe_open(sr, of); 359 smb_threshold_exit(&sv->sv_opipe_ct); 360 if (status != NT_STATUS_SUCCESS) 361 goto errout; 362 return (NT_STATUS_SUCCESS); 363 364 default: 365 status = NT_STATUS_BAD_DEVICE_TYPE; 366 goto errout; 367 } 368 369 smb_pathname_init(sr, pn, pn->pn_path); 370 if (!smb_pathname_validate(sr, pn)) { 371 status = sr->smb_error.status; 372 goto errout; 373 } 374 375 if (strlen(pn->pn_path) >= SMB_MAXPATHLEN) { 376 status = NT_STATUS_OBJECT_PATH_INVALID; 377 goto errout; 378 } 379 380 if (is_dir) { 381 if (!smb_validate_dirname(sr, pn)) { 382 status = sr->smb_error.status; 383 goto errout; 384 } 385 } else { 386 if (!smb_validate_object_name(sr, pn)) { 387 status = sr->smb_error.status; 388 goto errout; 389 } 390 } 391 392 cur_node = op->fqi.fq_dnode ? 393 op->fqi.fq_dnode : sr->tid_tree->t_snode; 394 395 rc = smb_pathname_reduce(sr, sr->user_cr, pn->pn_path, 396 sr->tid_tree->t_snode, cur_node, &op->fqi.fq_dnode, 397 op->fqi.fq_last_comp); 398 if (rc != 0) { 399 status = smb_errno2status(rc); 400 goto errout; 401 } 402 dnode = op->fqi.fq_dnode; 403 dnode_held = B_TRUE; 404 405 /* 406 * Lock the parent dir node in case another create 407 * request to the same parent directory comes in. 408 * Drop this once either lookup succeeds, or we've 409 * created the object in this directory. 410 */ 411 smb_node_wrlock(dnode); 412 dnode_wlock = B_TRUE; 413 414 /* 415 * If the access mask has only DELETE set (ignore 416 * FILE_READ_ATTRIBUTES), then assume that this 417 * is a request to delete the link (if a link) 418 * and do not follow links. Otherwise, follow 419 * the link to the target. 420 */ 421 if ((op->desired_access & ~FILE_READ_ATTRIBUTES) == DELETE) 422 lookup_flags &= ~SMB_FOLLOW_LINKS; 423 424 /* 425 * Lookup *just* the file portion of the name. 426 * Returns stream name in sname, which this allocates 427 */ 428 rc = smb_fsop_lookup_file(sr, zone_kcred(), lookup_flags, 429 sr->tid_tree->t_snode, op->fqi.fq_dnode, op->fqi.fq_last_comp, 430 &sname, &op->fqi.fq_fnode); 431 432 if (rc == 0) { 433 last_comp_found = B_TRUE; 434 fnode_held = B_TRUE; 435 436 /* 437 * Need the DOS attributes below, where we 438 * check the search attributes (sattr). 439 * Also UID, for owner check below. 440 */ 441 op->fqi.fq_fattr.sa_mask = SMB_AT_DOSATTR | SMB_AT_UID; 442 rc = smb_node_getattr(sr, op->fqi.fq_fnode, zone_kcred(), 443 NULL, &op->fqi.fq_fattr); 444 if (rc != 0) { 445 status = NT_STATUS_INTERNAL_ERROR; 446 goto errout; 447 } 448 } else if (rc == ENOENT) { 449 last_comp_found = B_FALSE; 450 op->fqi.fq_fnode = NULL; 451 rc = 0; 452 } else { 453 status = smb_errno2status(rc); 454 goto errout; 455 } 456 457 if (last_comp_found) { 458 459 fnode = op->fqi.fq_fnode; 460 dnode = op->fqi.fq_dnode; 461 462 if (!smb_node_is_file(fnode) && 463 !smb_node_is_dir(fnode) && 464 !smb_node_is_symlink(fnode)) { 465 status = NT_STATUS_ACCESS_DENIED; 466 goto errout; 467 } 468 469 /* 470 * Reject this request if either: 471 * - the target IS a directory and the client requires that 472 * it must NOT be (required by Lotus Notes) 473 * - the target is NOT a directory and client requires that 474 * it MUST be. 475 * Streams are never directories. 476 */ 477 if (smb_node_is_dir(fnode) && sname == NULL) { 478 if (op->create_options & FILE_NON_DIRECTORY_FILE) { 479 status = NT_STATUS_FILE_IS_A_DIRECTORY; 480 goto errout; 481 } 482 } else { 483 if ((op->create_options & FILE_DIRECTORY_FILE) || 484 (op->nt_flags & NT_CREATE_FLAG_OPEN_TARGET_DIR)) { 485 status = NT_STATUS_NOT_A_DIRECTORY; 486 goto errout; 487 } 488 } 489 490 /* If we're given a stream name, look it up now */ 491 if (sname != NULL) { 492 tmp_node = fnode; 493 rc = smb_fsop_lookup_stream(sr, zone_kcred(), 494 lookup_flags, sr->tid_tree->t_snode, fnode, sname, 495 &fnode); 496 } else { 497 rc = 0; 498 } 499 500 if (rc == 0) { /* Stream Exists (including unnamed stream) */ 501 stream_found = B_TRUE; 502 smb_node_unlock(dnode); 503 dnode_wlock = B_FALSE; 504 505 if (tmp_node != NULL) 506 smb_node_release(tmp_node); 507 508 /* 509 * No more open should be accepted when 510 * "Delete on close" flag is set. 511 */ 512 if (fnode->flags & NODE_FLAGS_DELETE_ON_CLOSE) { 513 status = NT_STATUS_DELETE_PENDING; 514 goto errout; 515 } 516 517 /* 518 * Specified file already exists 519 * so the operation should fail. 520 */ 521 if (op->create_disposition == FILE_CREATE) { 522 status = NT_STATUS_OBJECT_NAME_COLLISION; 523 goto errout; 524 } 525 526 if ((op->create_disposition == FILE_SUPERSEDE) || 527 (op->create_disposition == FILE_OVERWRITE_IF) || 528 (op->create_disposition == FILE_OVERWRITE)) { 529 530 if (sname == NULL) { 531 if (!smb_sattr_check( 532 op->fqi.fq_fattr.sa_dosattr, 533 op->dattr)) { 534 status = 535 NT_STATUS_ACCESS_DENIED; 536 goto errout; 537 } 538 op->desired_access |= 539 FILE_WRITE_ATTRIBUTES; 540 } 541 542 if (smb_node_is_dir(fnode)) { 543 status = NT_STATUS_ACCESS_DENIED; 544 goto errout; 545 } 546 } 547 548 /* MS-FSA 2.1.5.1.2 */ 549 if (op->create_disposition == FILE_SUPERSEDE) 550 op->desired_access |= DELETE; 551 if ((op->create_disposition == FILE_OVERWRITE_IF) || 552 (op->create_disposition == FILE_OVERWRITE)) 553 op->desired_access |= FILE_WRITE_DATA; 554 } else if (rc == ENOENT) { /* File Exists, but Stream doesn't */ 555 if (op->create_disposition == FILE_OPEN || 556 op->create_disposition == FILE_OVERWRITE) { 557 status = NT_STATUS_OBJECT_NAME_NOT_FOUND; 558 goto errout; 559 } 560 561 op->desired_access |= FILE_WRITE_DATA; 562 } else { /* Error looking up stream */ 563 status = smb_errno2status(rc); 564 fnode = tmp_node; 565 goto errout; 566 } 567 568 /* 569 * Windows seems to check read-only access before file 570 * sharing check. 571 * 572 * Check to see if the file is currently readonly (regardless 573 * of whether this open will make it readonly). 574 * Readonly is ignored on directories. 575 */ 576 if (SMB_PATHFILE_IS_READONLY(sr, fnode) && 577 !smb_node_is_dir(fnode)) { 578 if (op->desired_access & 579 (FILE_WRITE_DATA | FILE_APPEND_DATA)) { 580 status = NT_STATUS_ACCESS_DENIED; 581 goto errout; 582 } 583 if (op->create_options & FILE_DELETE_ON_CLOSE) { 584 status = NT_STATUS_CANNOT_DELETE; 585 goto errout; 586 } 587 } 588 589 /* Dataset roots can't be deleted, so don't set DOC */ 590 if ((op->create_options & FILE_DELETE_ON_CLOSE) != 0 && 591 (fnode->flags & NODE_FLAGS_VFSROOT) != 0) { 592 status = NT_STATUS_CANNOT_DELETE; 593 goto errout; 594 } 595 596 status = smb_fsop_access(sr, sr->user_cr, fnode, 597 op->desired_access); 598 599 if (status != NT_STATUS_SUCCESS) 600 goto errout; 601 602 if (max_requested) { 603 smb_fsop_eaccess(sr, sr->user_cr, fnode, &max_allowed); 604 op->desired_access |= max_allowed; 605 } 606 607 /* 608 * File owner should always get read control + read attr. 609 */ 610 if (crgetuid(sr->user_cr) == op->fqi.fq_fattr.sa_vattr.va_uid) 611 op->desired_access |= 612 (READ_CONTROL | FILE_READ_ATTRIBUTES); 613 614 /* 615 * According to MS "dochelp" mail in Mar 2015, any handle 616 * on which read or write access is granted implicitly 617 * gets "read attributes", even if it was not requested. 618 */ 619 if ((op->desired_access & FILE_DATA_ALL) != 0) 620 op->desired_access |= FILE_READ_ATTRIBUTES; 621 622 /* If the stream didn't exist, create it now */ 623 if (!stream_found) { 624 smb_node_t *tmp_node = fnode; 625 626 bzero(&new_attr, sizeof (new_attr)); 627 new_attr.sa_vattr.va_type = VREG; 628 new_attr.sa_vattr.va_mode = S_IRUSR; 629 new_attr.sa_mask |= SMB_AT_TYPE | SMB_AT_MODE; 630 631 rc = smb_fsop_create_stream(sr, sr->user_cr, dnode, 632 fnode, sname, lookup_flags, &new_attr, &fnode); 633 smb_node_release(tmp_node); 634 635 if (rc != 0) { 636 status = smb_errno2status(rc); 637 fnode_held = B_FALSE; 638 goto errout; 639 } 640 op->action_taken = SMB_OACT_CREATED; 641 created = B_TRUE; 642 643 smb_node_unlock(dnode); 644 dnode_wlock = B_FALSE; 645 } 646 647 /* 648 * Oplock break is done prior to sharing checks as the break 649 * may cause other clients to close the file which would 650 * affect the sharing checks, and may delete the file due to 651 * DELETE_ON_CLOSE. This may block, so set the file opening 652 * count before oplock stuff. 653 * 654 * Need the "proposed" ofile (and its TargetOplockKey) for 655 * correct oplock break semantics. 656 */ 657 of = smb_ofile_alloc(sr, op, fnode, SMB_FTYPE_DISK, 658 tree_fid); 659 tree_fid = 0; // given to the ofile 660 uniq_fid = of->f_uniqid; 661 662 smb_node_inc_opening_count(fnode); 663 opening_incr = B_TRUE; 664 665 if (!stream_found) { 666 /* 667 * Stake our Share Access claim. 668 */ 669 smb_node_wrlock(fnode); 670 fnode_wlock = B_TRUE; 671 672 status = smb_fsop_shrlock(sr->user_cr, fnode, uniq_fid, 673 op->desired_access, op->share_access); 674 if (status != 0) 675 goto errout; 676 677 fnode_shrlk = B_TRUE; 678 smb_node_unlock(fnode); 679 fnode_wlock = B_FALSE; 680 goto stream_created; 681 } 682 683 /* 684 * XXX Supposed to do share access checks next. 685 * [MS-FSA] describes that as part of access check: 686 * 2.1.5.1.2.1 Alg... Check Access to an Existing File 687 * 688 * If CreateDisposition is FILE_OPEN or FILE_OPEN_IF: 689 * If Open.Stream.Oplock is not empty and 690 * Open.Stream.Oplock.State contains BATCH_OPLOCK, 691 * the object store MUST check for an oplock 692 * break according to the algorithm in section 2.1.4.12, 693 * with input values as follows: 694 * Open equal to this operation's Open 695 * Oplock equal to Open.Stream.Oplock 696 * Operation equal to "OPEN" 697 * OpParams containing two members: 698 * DesiredAccess, CreateDisposition 699 * 700 * It's not clear how Windows would ask the FS layer if 701 * the file has a BATCH oplock. We'll use a call to the 702 * common oplock code, which calls smb_oplock_break_OPEN 703 * only if the oplock state contains BATCH_OPLOCK. 704 * See: smb_oplock_break_BATCH() 705 * 706 * Also note: There's a nearly identical section in the 707 * spec. at the start of the "else" part of the above 708 * "if (disposition is overwrite, overwrite_if)" so this 709 * section (oplock break, the share mode check, and the 710 * next oplock_break_HANDLE) are all factored out to be 711 * in all cases above that if/else from the spec. 712 */ 713 status = smb_oplock_break_BATCH(fnode, of, 714 op->desired_access, op->create_disposition); 715 if (status == NT_STATUS_OPLOCK_BREAK_IN_PROGRESS) { 716 if (sr->session->dialect >= SMB_VERS_2_BASE) 717 (void) smb2sr_go_async(sr); 718 status = smb_oplock_wait_break(sr, fnode, 0); 719 } 720 if (status != NT_STATUS_SUCCESS) 721 goto errout; 722 723 /* 724 * Check for sharing violations, and if any, 725 * do oplock break of handle caching. 726 * 727 * Need node_wrlock during shrlock checks, 728 * and not locked during oplock breaks etc. 729 */ 730 shrlock_t0 = gethrtime(); 731 shrlock_again: 732 smb_node_wrlock(fnode); 733 fnode_wlock = B_TRUE; 734 status = smb_fsop_shrlock(sr->user_cr, fnode, uniq_fid, 735 op->desired_access, op->share_access); 736 smb_node_unlock(fnode); 737 fnode_wlock = B_FALSE; 738 739 /* 740 * [MS-FSA] "OPEN_BREAK_H" 741 * If the (proposed) new open would violate sharing rules, 742 * indicate an oplock break with OPEN_BREAK_H (to break 743 * handle level caching rights) then try again. 744 */ 745 if (status == NT_STATUS_SHARING_VIOLATION && 746 did_break_handle == B_FALSE) { 747 did_break_handle = B_TRUE; 748 749 status = smb_oplock_break_HANDLE(fnode, of); 750 if (status == NT_STATUS_OPLOCK_BREAK_IN_PROGRESS) { 751 if (sr->session->dialect >= SMB_VERS_2_BASE) 752 (void) smb2sr_go_async(sr); 753 status = smb_oplock_wait_break(sr, fnode, 0); 754 } else { 755 /* 756 * Even when the oplock layer does NOT 757 * give us the special status indicating 758 * we should wait, it may have scheduled 759 * taskq jobs that may close handles. 760 * Give those a chance to run before we 761 * check again for sharing violations. 762 */ 763 delay(MSEC_TO_TICK(10)); 764 } 765 if (status != NT_STATUS_SUCCESS) 766 goto errout; 767 768 goto shrlock_again; 769 } 770 771 /* 772 * If we still have orphaned durable handles on this file, 773 * let's assume the client has lost interest in those and 774 * close them so they don't cause sharing violations. 775 * See longer comment at smb2_dh_close_my_orphans(). 776 */ 777 if (status == NT_STATUS_SHARING_VIOLATION && 778 sr->session->dialect >= SMB_VERS_2_BASE && 779 did_cleanup_orphans == B_FALSE) { 780 781 did_cleanup_orphans = B_TRUE; 782 smb2_dh_close_my_orphans(sr, of); 783 784 goto shrlock_again; 785 } 786 787 /* 788 * SMB1 expects a 1 sec. delay before returning a 789 * sharing violation error. If breaking oplocks 790 * above took less than a sec, wait some more. 791 * See: smbtorture base.defer_open 792 */ 793 if (status == NT_STATUS_SHARING_VIOLATION && 794 sr->session->dialect < SMB_VERS_2_BASE) { 795 hrtime_t t1 = shrlock_t0 + NANOSEC; 796 hrtime_t now = gethrtime(); 797 if (now < t1) { 798 delay(NSEC_TO_TICK_ROUNDUP(t1 - now)); 799 } 800 } 801 802 if (status != NT_STATUS_SUCCESS) 803 goto errout; 804 fnode_shrlk = B_TRUE; 805 806 /* 807 * The [MS-FSA] spec. describes this oplock break as 808 * part of the sharing access checks. See: 809 * 2.1.5.1.2.2 Algorithm to Check Sharing Access... 810 * At the end of the share mode tests described there, 811 * if it has not returned "sharing violation", it 812 * specifies a call to the alg. in sec. 2.1.4.12, 813 * that boils down to: smb_oplock_break_OPEN() 814 */ 815 status = smb_oplock_break_OPEN(fnode, of, 816 op->desired_access, 817 op->create_disposition); 818 if (status == NT_STATUS_OPLOCK_BREAK_IN_PROGRESS) { 819 if (sr->session->dialect >= SMB_VERS_2_BASE) 820 (void) smb2sr_go_async(sr); 821 status = smb_oplock_wait_break(sr, fnode, 0); 822 } 823 if (status != NT_STATUS_SUCCESS) 824 goto errout; 825 826 if ((fnode->flags & NODE_FLAGS_DELETE_COMMITTED) != 0) { 827 /* 828 * Breaking the oplock caused the file to be deleted, 829 * so let's bail and pretend the file wasn't found. 830 * Have to duplicate much of the logic found a the 831 * "errout" label here. 832 * 833 * This code path is exercised by smbtorture 834 * smb2.durable-open.delete_on_close1 835 */ 836 DTRACE_PROBE1(node_deleted, smb_node_t, fnode); 837 smb_ofile_free(of); 838 of = NULL; 839 last_comp_found = B_FALSE; 840 841 /* 842 * Get all the holds and locks into the state 843 * they would have if lookup had failed. 844 */ 845 fnode_shrlk = B_FALSE; 846 smb_fsop_unshrlock(sr->user_cr, fnode, uniq_fid); 847 848 opening_incr = B_FALSE; 849 smb_node_dec_opening_count(fnode); 850 851 fnode_held = B_FALSE; 852 smb_node_release(fnode); 853 854 dnode_wlock = B_TRUE; 855 smb_node_wrlock(dnode); 856 857 goto create; 858 } 859 860 /* 861 * Go ahead with modifications as necessary. 862 */ 863 switch (op->create_disposition) { 864 case FILE_SUPERSEDE: 865 case FILE_OVERWRITE_IF: 866 case FILE_OVERWRITE: 867 bzero(&new_attr, sizeof (new_attr)); 868 if (sname == NULL) { 869 op->dattr |= FILE_ATTRIBUTE_ARCHIVE; 870 /* 871 * Don't apply readonly until 872 * smb_set_open_attributes 873 */ 874 if (op->dattr & FILE_ATTRIBUTE_READONLY) { 875 op->dattr &= ~FILE_ATTRIBUTE_READONLY; 876 op->created_readonly = B_TRUE; 877 } 878 new_attr.sa_dosattr = op->dattr; 879 } else { 880 new_attr.sa_dosattr = FILE_ATTRIBUTE_ARCHIVE; 881 } 882 883 /* 884 * Truncate the file data here. 885 * We set alloc_size = op->dsize later, 886 * after we have an ofile. See: 887 * smb_set_open_attributes 888 */ 889 new_attr.sa_vattr.va_size = 0; 890 new_attr.sa_mask = SMB_AT_DOSATTR | SMB_AT_SIZE; 891 rc = smb_fsop_setattr(sr, sr->user_cr, fnode, 892 &new_attr); 893 if (rc != 0) { 894 status = smb_errno2status(rc); 895 goto errout; 896 } 897 898 /* 899 * If file is being replaced, remove existing streams 900 */ 901 if (SMB_IS_STREAM(fnode) == 0) { 902 status = smb_fsop_remove_streams(sr, 903 sr->user_cr, fnode); 904 if (status != 0) 905 goto errout; 906 } 907 908 op->action_taken = SMB_OACT_TRUNCATED; 909 break; 910 911 default: 912 /* 913 * FILE_OPEN or FILE_OPEN_IF. 914 */ 915 /* 916 * Ignore any user-specified alloc_size for 917 * existing files, to avoid truncation in 918 * smb_set_open_attributes 919 */ 920 op->dsize = 0L; 921 op->action_taken = SMB_OACT_OPENED; 922 break; 923 } 924 } else { 925 create: 926 /* Last component was not found. */ 927 dnode = op->fqi.fq_dnode; 928 929 if (is_dir == 0) 930 is_stream = smb_is_stream_name(pn->pn_path); 931 932 if ((op->create_disposition == FILE_OPEN) || 933 (op->create_disposition == FILE_OVERWRITE)) { 934 status = NT_STATUS_OBJECT_NAME_NOT_FOUND; 935 goto errout; 936 } 937 938 if ((op->desired_access & ACCESS_SYSTEM_SECURITY) != 0 && 939 !smb_user_has_security_priv(sr->uid_user, sr->user_cr)) { 940 status = NT_STATUS_ACCESS_DENIED; 941 goto errout; 942 } 943 944 if (pn->pn_fname && smb_is_invalid_filename(pn->pn_fname)) { 945 status = NT_STATUS_OBJECT_NAME_INVALID; 946 goto errout; 947 } 948 949 /* 950 * Don't create in directories marked "Delete on close". 951 */ 952 if (dnode->flags & NODE_FLAGS_DELETE_ON_CLOSE) { 953 status = NT_STATUS_DELETE_PENDING; 954 goto errout; 955 } 956 957 /* 958 * Create always sets the DOS attributes, type, and mode 959 * in the if/else below (different for file vs directory). 960 * Don't set the readonly bit until smb_set_open_attributes 961 * or that would prevent this open. Note that op->dattr 962 * needs to be what smb_set_open_attributes will use, 963 * except for the readonly bit. 964 */ 965 bzero(&new_attr, sizeof (new_attr)); 966 new_attr.sa_mask = SMB_AT_DOSATTR | SMB_AT_TYPE | SMB_AT_MODE; 967 if (op->dattr & FILE_ATTRIBUTE_READONLY) { 968 op->dattr &= ~FILE_ATTRIBUTE_READONLY; 969 op->created_readonly = B_TRUE; 970 } 971 972 /* 973 * SMB create can specify the create time. 974 */ 975 if ((op->crtime.tv_sec != 0) && 976 (op->crtime.tv_sec != UINT_MAX)) { 977 new_attr.sa_mask |= SMB_AT_CRTIME; 978 new_attr.sa_crtime = op->crtime; 979 } 980 981 if (is_dir == 0) { 982 op->dattr |= FILE_ATTRIBUTE_ARCHIVE; 983 new_attr.sa_dosattr = op->dattr; 984 new_attr.sa_vattr.va_type = VREG; 985 if (is_stream) 986 new_attr.sa_vattr.va_mode = S_IRUSR | S_IWUSR; 987 else 988 new_attr.sa_vattr.va_mode = 989 S_IRUSR | S_IRGRP | S_IROTH | 990 S_IWUSR | S_IWGRP | S_IWOTH; 991 992 /* 993 * We set alloc_size = op->dsize later, 994 * (in smb_set_open_attributes) after we 995 * have an ofile on which to save that. 996 * 997 * Legacy Open&X sets size to alloc_size 998 * when creating a new file. 999 */ 1000 if (sr->smb_com == SMB_COM_OPEN_ANDX) { 1001 new_attr.sa_vattr.va_size = op->dsize; 1002 new_attr.sa_mask |= SMB_AT_SIZE; 1003 } 1004 1005 rc = smb_fsop_create(sr, sr->user_cr, dnode, 1006 op->fqi.fq_last_comp, &new_attr, &op->fqi.fq_fnode); 1007 } else { 1008 op->dattr |= FILE_ATTRIBUTE_DIRECTORY; 1009 new_attr.sa_dosattr = op->dattr; 1010 new_attr.sa_vattr.va_type = VDIR; 1011 new_attr.sa_vattr.va_mode = 0777; 1012 1013 rc = smb_fsop_mkdir(sr, sr->user_cr, dnode, 1014 op->fqi.fq_last_comp, &new_attr, &op->fqi.fq_fnode); 1015 } 1016 if (rc != 0) { 1017 status = smb_errno2status(rc); 1018 goto errout; 1019 } 1020 1021 /* Create done. */ 1022 smb_node_unlock(dnode); 1023 dnode_wlock = B_FALSE; 1024 1025 created = B_TRUE; 1026 op->action_taken = SMB_OACT_CREATED; 1027 1028 /* Note: hold from create */ 1029 fnode = op->fqi.fq_fnode; 1030 fnode_held = B_TRUE; 1031 1032 if (max_requested) { 1033 smb_fsop_eaccess(sr, sr->user_cr, fnode, &max_allowed); 1034 op->desired_access |= max_allowed; 1035 } 1036 /* 1037 * We created this object (we own it) so grant 1038 * read_control + read_attributes on this handle, 1039 * even if that was not requested. This avoids 1040 * unexpected access failures later. 1041 */ 1042 op->desired_access |= (READ_CONTROL | FILE_READ_ATTRIBUTES); 1043 1044 /* Allocate the ofile and fill in most of it. */ 1045 of = smb_ofile_alloc(sr, op, fnode, SMB_FTYPE_DISK, 1046 tree_fid); 1047 tree_fid = 0; // given to the ofile 1048 uniq_fid = of->f_uniqid; 1049 1050 smb_node_inc_opening_count(fnode); 1051 opening_incr = B_TRUE; 1052 1053 /* 1054 * Share access checks... 1055 */ 1056 smb_node_wrlock(fnode); 1057 fnode_wlock = B_TRUE; 1058 1059 status = smb_fsop_shrlock(sr->user_cr, fnode, uniq_fid, 1060 op->desired_access, op->share_access); 1061 if (status != 0) 1062 goto errout; 1063 fnode_shrlk = B_TRUE; 1064 1065 /* 1066 * MS-FSA 2.1.5.1.1 1067 * If the Oplock member of the DirectoryStream in 1068 * Link.ParentFile.StreamList (ParentOplock) is 1069 * not empty ... oplock break on the parent... 1070 * (dnode is the parent directory) 1071 * 1072 * This compares of->ParentOplockKey with each 1073 * oplock of->TargetOplockKey and breaks... 1074 * so it's OK that we're passing an OF that's 1075 * NOT a member of dnode->n_ofile_list 1076 * 1077 * The break never blocks, so ignore the return. 1078 */ 1079 (void) smb_oplock_break_PARENT(dnode, of); 1080 } 1081 1082 stream_created: 1083 /* 1084 * We might have blocked in smb_oplock_break_OPEN long enough 1085 * so a tree disconnect might have happened. In that case, 1086 * we would be adding an ofile to a tree that's disconnecting, 1087 * which would interfere with tear-down. If so, error out. 1088 */ 1089 if (!smb_tree_is_connected(sr->tid_tree)) { 1090 status = NT_STATUS_INVALID_PARAMETER; 1091 goto errout; 1092 } 1093 1094 /* 1095 * Moved this up from smb_ofile_open() 1096 */ 1097 if ((rc = smb_fsop_open(fnode, of->f_mode, of->f_cr)) != 0) { 1098 status = smb_errno2status(rc); 1099 goto errout; 1100 } 1101 1102 /* 1103 * Complete this open (add to ofile lists) 1104 */ 1105 smb_ofile_open(sr, op, of); 1106 did_open = B_TRUE; 1107 1108 /* 1109 * This MUST be done after ofile creation, so that explicitly 1110 * set timestamps can be remembered on the ofile, and setting 1111 * the readonly flag won't affect access via this open. 1112 */ 1113 if ((rc = smb_set_open_attributes(sr, of)) != 0) { 1114 status = smb_errno2status(rc); 1115 goto errout; 1116 } 1117 1118 /* 1119 * We've already done access checks above, 1120 * and want this call to succeed even when 1121 * !(desired_access & FILE_READ_ATTRIBUTES), 1122 * so pass kcred here. 1123 */ 1124 op->fqi.fq_fattr.sa_mask = SMB_AT_ALL; 1125 (void) smb_node_getattr(sr, fnode, zone_kcred(), of, 1126 &op->fqi.fq_fattr); 1127 1128 /* 1129 * Propagate the write-through mode from the open params 1130 * to the node: see the notes in the function header. 1131 * XXX: write_through should be a flag on the ofile. 1132 */ 1133 if (sr->sr_cfg->skc_sync_enable || 1134 (op->create_options & FILE_WRITE_THROUGH)) 1135 fnode->flags |= NODE_FLAGS_WRITE_THROUGH; 1136 1137 /* 1138 * Set up the fileid and dosattr in open_param for response 1139 */ 1140 op->fileid = op->fqi.fq_fattr.sa_vattr.va_nodeid; 1141 op->dattr = op->fqi.fq_fattr.sa_dosattr; 1142 1143 /* 1144 * Set up the file type in open_param for the response 1145 */ 1146 op->ftype = SMB_FTYPE_DISK; 1147 sr->smb_fid = of->f_fid; 1148 sr->fid_ofile = of; 1149 1150 if (smb_node_is_file(fnode)) { 1151 op->dsize = op->fqi.fq_fattr.sa_vattr.va_size; 1152 } else { 1153 /* directory or symlink */ 1154 op->dsize = 0; 1155 } 1156 1157 /* 1158 * Note: oplock_acquire happens in callers, because 1159 * how that happens is protocol-specific. 1160 */ 1161 1162 if (sname != NULL) 1163 kmem_free(sname, MAXNAMELEN); 1164 if (fnode_wlock) 1165 smb_node_unlock(fnode); 1166 if (opening_incr) 1167 smb_node_dec_opening_count(fnode); 1168 if (fnode_held) 1169 smb_node_release(fnode); 1170 if (dnode_wlock) 1171 smb_node_unlock(dnode); 1172 if (dnode_held) 1173 smb_node_release(dnode); 1174 1175 return (NT_STATUS_SUCCESS); 1176 1177 errout: 1178 if (did_open) { 1179 smb_ofile_close(of, 0); 1180 /* rele via sr->fid_ofile */ 1181 } else if (of != NULL) { 1182 /* No other refs possible */ 1183 smb_ofile_free(of); 1184 } 1185 1186 if (fnode_shrlk) 1187 smb_fsop_unshrlock(sr->user_cr, fnode, uniq_fid); 1188 1189 if (created) { 1190 /* Try to roll-back create. */ 1191 smb_delete_new_object(sr); 1192 } 1193 1194 if (sname != NULL) 1195 kmem_free(sname, MAXNAMELEN); 1196 if (fnode_wlock) 1197 smb_node_unlock(fnode); 1198 if (opening_incr) 1199 smb_node_dec_opening_count(fnode); 1200 if (fnode_held) 1201 smb_node_release(fnode); 1202 if (dnode_wlock) 1203 smb_node_unlock(dnode); 1204 if (dnode_held) 1205 smb_node_release(dnode); 1206 1207 if (tree_fid != 0) 1208 smb_idpool_free(&tree->t_fid_pool, tree_fid); 1209 1210 return (status); 1211 } 1212 1213 /* 1214 * smb_set_open_attributes 1215 * 1216 * Last write time: 1217 * - If the last_write time specified in the open params is not 0 or -1, 1218 * use it as file's mtime. This will be considered an explicitly set 1219 * timestamps, not reset by subsequent writes. 1220 * 1221 * DOS attributes 1222 * - If we created_readonly, we now store the real DOS attributes 1223 * (including the readonly bit) so subsequent opens will see it. 1224 * 1225 * Returns: errno 1226 */ 1227 static int 1228 smb_set_open_attributes(smb_request_t *sr, smb_ofile_t *of) 1229 { 1230 smb_attr_t attr; 1231 smb_arg_open_t *op = &sr->sr_open; 1232 smb_node_t *node = of->f_node; 1233 int rc = 0; 1234 1235 bzero(&attr, sizeof (smb_attr_t)); 1236 1237 if (op->created_readonly) { 1238 attr.sa_dosattr = op->dattr | FILE_ATTRIBUTE_READONLY; 1239 attr.sa_mask |= SMB_AT_DOSATTR; 1240 } 1241 1242 if (op->dsize != 0) { 1243 attr.sa_allocsz = op->dsize; 1244 attr.sa_mask |= SMB_AT_ALLOCSZ; 1245 } 1246 1247 if ((op->mtime.tv_sec != 0) && (op->mtime.tv_sec != UINT_MAX)) { 1248 attr.sa_vattr.va_mtime = op->mtime; 1249 attr.sa_mask |= SMB_AT_MTIME; 1250 } 1251 1252 if (attr.sa_mask != 0) 1253 rc = smb_node_setattr(sr, node, of->f_cr, of, &attr); 1254 1255 return (rc); 1256 } 1257 1258 /* 1259 * This function is used to delete a newly created object (file or 1260 * directory) if an error occurs after creation of the object. 1261 */ 1262 static void 1263 smb_delete_new_object(smb_request_t *sr) 1264 { 1265 smb_arg_open_t *op = &sr->sr_open; 1266 smb_fqi_t *fqi = &(op->fqi); 1267 uint32_t flags = 0; 1268 1269 if (SMB_TREE_IS_CASEINSENSITIVE(sr)) 1270 flags |= SMB_IGNORE_CASE; 1271 if (SMB_TREE_SUPPORTS_CATIA(sr)) 1272 flags |= SMB_CATIA; 1273 1274 if (op->create_options & FILE_DIRECTORY_FILE) 1275 (void) smb_fsop_rmdir(sr, sr->user_cr, fqi->fq_dnode, 1276 fqi->fq_last_comp, flags); 1277 else 1278 (void) smb_fsop_remove(sr, sr->user_cr, fqi->fq_dnode, 1279 fqi->fq_last_comp, flags); 1280 } 1281